diff --git a/sys/netinet/icmp6.h b/sys/netinet/icmp6.h index 7429b8173b6a..45a8b8ec0ce8 100644 --- a/sys/netinet/icmp6.h +++ b/sys/netinet/icmp6.h @@ -1,789 +1,790 @@ /* $FreeBSD$ */ /* $KAME: icmp6.h,v 1.46 2001/04/27 15:09:48 itojun Exp $ */ /*- * SPDX-License-Identifier: BSD-3-Clause * * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the project nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ /*- * Copyright (c) 1982, 1986, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)ip_icmp.h 8.1 (Berkeley) 6/10/93 */ #ifndef _NETINET_ICMP6_H_ #define _NETINET_ICMP6_H_ #define ICMPV6_PLD_MAXLEN 1232 /* IPV6_MMTU - sizeof(struct ip6_hdr) - sizeof(struct icmp6_hdr) */ struct icmp6_hdr { u_int8_t icmp6_type; /* type field */ u_int8_t icmp6_code; /* code field */ u_int16_t icmp6_cksum; /* checksum field */ union { u_int32_t icmp6_un_data32[1]; /* type-specific field */ u_int16_t icmp6_un_data16[2]; /* type-specific field */ u_int8_t icmp6_un_data8[4]; /* type-specific field */ } icmp6_dataun; } __packed; #define icmp6_data32 icmp6_dataun.icmp6_un_data32 #define icmp6_data16 icmp6_dataun.icmp6_un_data16 #define icmp6_data8 icmp6_dataun.icmp6_un_data8 #define icmp6_pptr icmp6_data32[0] /* parameter prob */ #define icmp6_mtu icmp6_data32[0] /* packet too big */ #define icmp6_id icmp6_data16[0] /* echo request/reply */ #define icmp6_seq icmp6_data16[1] /* echo request/reply */ #define icmp6_maxdelay icmp6_data16[0] /* mcast group membership */ #define ICMP6_DST_UNREACH 1 /* dest unreachable, codes: */ #define ICMP6_PACKET_TOO_BIG 2 /* packet too big */ #define ICMP6_TIME_EXCEEDED 3 /* time exceeded, code: */ #define ICMP6_PARAM_PROB 4 /* ip6 header bad */ #define ICMP6_ECHO_REQUEST 128 /* echo service */ #define ICMP6_ECHO_REPLY 129 /* echo reply */ #define MLD_LISTENER_QUERY 130 /* multicast listener query */ #define MLD_LISTENER_REPORT 131 /* multicast listener report */ #define MLD_LISTENER_DONE 132 /* multicast listener done */ #define MLD_LISTENER_REDUCTION MLD_LISTENER_DONE /* RFC3542 definition */ /* RFC2292 decls */ #define ICMP6_MEMBERSHIP_QUERY 130 /* group membership query */ #define ICMP6_MEMBERSHIP_REPORT 131 /* group membership report */ #define ICMP6_MEMBERSHIP_REDUCTION 132 /* group membership termination */ #ifndef _KERNEL /* the followings are for backward compatibility to old KAME apps. */ #define MLD6_LISTENER_QUERY MLD_LISTENER_QUERY #define MLD6_LISTENER_REPORT MLD_LISTENER_REPORT #define MLD6_LISTENER_DONE MLD_LISTENER_DONE #endif #define ND_ROUTER_SOLICIT 133 /* router solicitation */ #define ND_ROUTER_ADVERT 134 /* router advertisement */ #define ND_NEIGHBOR_SOLICIT 135 /* neighbor solicitation */ #define ND_NEIGHBOR_ADVERT 136 /* neighbor advertisement */ #define ND_REDIRECT 137 /* redirect */ #define ICMP6_ROUTER_RENUMBERING 138 /* router renumbering */ #define ICMP6_WRUREQUEST 139 /* who are you request */ #define ICMP6_WRUREPLY 140 /* who are you reply */ #define ICMP6_FQDN_QUERY 139 /* FQDN query */ #define ICMP6_FQDN_REPLY 140 /* FQDN reply */ #define ICMP6_NI_QUERY 139 /* node information request */ #define ICMP6_NI_REPLY 140 /* node information reply */ #define MLDV2_LISTENER_REPORT 143 /* RFC3810 listener report */ /* The definitions below are experimental. TBA */ #define MLD_MTRACE_RESP 200 /* mtrace resp (to sender) */ #define MLD_MTRACE 201 /* mtrace messages */ #ifndef _KERNEL #define MLD6_MTRACE_RESP MLD_MTRACE_RESP #define MLD6_MTRACE MLD_MTRACE #endif #define ICMP6_MAXTYPE 201 #define ICMP6_DST_UNREACH_NOROUTE 0 /* no route to destination */ #define ICMP6_DST_UNREACH_ADMIN 1 /* administratively prohibited */ #define ICMP6_DST_UNREACH_NOTNEIGHBOR 2 /* not a neighbor(obsolete) */ #define ICMP6_DST_UNREACH_BEYONDSCOPE 2 /* beyond scope of source address */ #define ICMP6_DST_UNREACH_ADDR 3 /* address unreachable */ #define ICMP6_DST_UNREACH_NOPORT 4 /* port unreachable */ #define ICMP6_DST_UNREACH_POLICY 5 /* failed ingress/egress policy */ #define ICMP6_DST_UNREACH_REJECT 6 /* Reject route to destination */ #define ICMP6_DST_UNREACH_SRCROUTE 7 /* Error in source routing header */ #define ICMP6_TIME_EXCEED_TRANSIT 0 /* ttl==0 in transit */ #define ICMP6_TIME_EXCEED_REASSEMBLY 1 /* ttl==0 in reass */ #define ICMP6_PARAMPROB_HEADER 0 /* erroneous header field */ #define ICMP6_PARAMPROB_NEXTHEADER 1 /* unrecognized next header */ #define ICMP6_PARAMPROB_OPTION 2 /* unrecognized option */ #define ICMP6_INFOMSG_MASK 0x80 /* all informational messages */ #define ICMP6_NI_SUBJ_IPV6 0 /* Query Subject is an IPv6 address */ #define ICMP6_NI_SUBJ_FQDN 1 /* Query Subject is a Domain name */ #define ICMP6_NI_SUBJ_IPV4 2 /* Query Subject is an IPv4 address */ #define ICMP6_NI_SUCCESS 0 /* node information successful reply */ #define ICMP6_NI_REFUSED 1 /* node information request is refused */ #define ICMP6_NI_UNKNOWN 2 /* unknown Qtype */ #define ICMP6_ROUTER_RENUMBERING_COMMAND 0 /* rr command */ #define ICMP6_ROUTER_RENUMBERING_RESULT 1 /* rr result */ #define ICMP6_ROUTER_RENUMBERING_SEQNUM_RESET 255 /* rr seq num reset */ /* Used in kernel only */ #define ND_REDIRECT_ONLINK 0 /* redirect to an on-link node */ #define ND_REDIRECT_ROUTER 1 /* redirect to a better router */ /* * Multicast Listener Discovery */ struct mld_hdr { struct icmp6_hdr mld_icmp6_hdr; struct in6_addr mld_addr; /* multicast address */ } __packed; /* definitions to provide backward compatibility to old KAME applications */ #ifndef _KERNEL #define mld6_hdr mld_hdr #define mld6_type mld_type #define mld6_code mld_code #define mld6_cksum mld_cksum #define mld6_maxdelay mld_maxdelay #define mld6_reserved mld_reserved #define mld6_addr mld_addr #endif /* shortcut macro definitions */ #define mld_type mld_icmp6_hdr.icmp6_type #define mld_code mld_icmp6_hdr.icmp6_code #define mld_cksum mld_icmp6_hdr.icmp6_cksum #define mld_maxdelay mld_icmp6_hdr.icmp6_data16[0] #define mld_reserved mld_icmp6_hdr.icmp6_data16[1] #define mld_v2_reserved mld_icmp6_hdr.icmp6_data16[0] #define mld_v2_numrecs mld_icmp6_hdr.icmp6_data16[1] /* * Neighbor Discovery */ struct nd_router_solicit { /* router solicitation */ struct icmp6_hdr nd_rs_hdr; /* could be followed by options */ } __packed; #define nd_rs_type nd_rs_hdr.icmp6_type #define nd_rs_code nd_rs_hdr.icmp6_code #define nd_rs_cksum nd_rs_hdr.icmp6_cksum #define nd_rs_reserved nd_rs_hdr.icmp6_data32[0] struct nd_router_advert { /* router advertisement */ struct icmp6_hdr nd_ra_hdr; u_int32_t nd_ra_reachable; /* reachable time */ u_int32_t nd_ra_retransmit; /* retransmit timer */ /* could be followed by options */ } __packed; #define nd_ra_type nd_ra_hdr.icmp6_type #define nd_ra_code nd_ra_hdr.icmp6_code #define nd_ra_cksum nd_ra_hdr.icmp6_cksum #define nd_ra_curhoplimit nd_ra_hdr.icmp6_data8[0] #define nd_ra_flags_reserved nd_ra_hdr.icmp6_data8[1] #define ND_RA_FLAG_MANAGED 0x80 #define ND_RA_FLAG_OTHER 0x40 #define ND_RA_FLAG_HA 0x20 /* * Router preference values based on draft-draves-ipngwg-router-selection-01. * These are non-standard definitions. */ #define ND_RA_FLAG_RTPREF_MASK 0x18 /* 00011000 */ #define ND_RA_FLAG_RTPREF_HIGH 0x08 /* 00001000 */ #define ND_RA_FLAG_RTPREF_MEDIUM 0x00 /* 00000000 */ #define ND_RA_FLAG_RTPREF_LOW 0x18 /* 00011000 */ #define ND_RA_FLAG_RTPREF_RSV 0x10 /* 00010000 */ #ifdef EXPERIMENTAL #define ND_RA_FLAG_IPV6_ONLY 0x02 /* draft-ietf-6man-ipv6only-flag */ #endif #define nd_ra_router_lifetime nd_ra_hdr.icmp6_data16[1] struct nd_neighbor_solicit { /* neighbor solicitation */ struct icmp6_hdr nd_ns_hdr; struct in6_addr nd_ns_target; /*target address */ /* could be followed by options */ } __packed; #define nd_ns_type nd_ns_hdr.icmp6_type #define nd_ns_code nd_ns_hdr.icmp6_code #define nd_ns_cksum nd_ns_hdr.icmp6_cksum #define nd_ns_reserved nd_ns_hdr.icmp6_data32[0] struct nd_neighbor_advert { /* neighbor advertisement */ struct icmp6_hdr nd_na_hdr; struct in6_addr nd_na_target; /* target address */ /* could be followed by options */ } __packed; #define nd_na_type nd_na_hdr.icmp6_type #define nd_na_code nd_na_hdr.icmp6_code #define nd_na_cksum nd_na_hdr.icmp6_cksum #define nd_na_flags_reserved nd_na_hdr.icmp6_data32[0] #if BYTE_ORDER == BIG_ENDIAN #define ND_NA_FLAG_ROUTER 0x80000000 #define ND_NA_FLAG_SOLICITED 0x40000000 #define ND_NA_FLAG_OVERRIDE 0x20000000 #else #if BYTE_ORDER == LITTLE_ENDIAN #define ND_NA_FLAG_ROUTER 0x80 #define ND_NA_FLAG_SOLICITED 0x40 #define ND_NA_FLAG_OVERRIDE 0x20 #endif #endif struct nd_redirect { /* redirect */ struct icmp6_hdr nd_rd_hdr; struct in6_addr nd_rd_target; /* target address */ struct in6_addr nd_rd_dst; /* destination address */ /* could be followed by options */ } __packed; #define nd_rd_type nd_rd_hdr.icmp6_type #define nd_rd_code nd_rd_hdr.icmp6_code #define nd_rd_cksum nd_rd_hdr.icmp6_cksum #define nd_rd_reserved nd_rd_hdr.icmp6_data32[0] struct nd_opt_hdr { /* Neighbor discovery option header */ u_int8_t nd_opt_type; u_int8_t nd_opt_len; /* followed by option specific data*/ } __packed; #define ND_OPT_SOURCE_LINKADDR 1 #define ND_OPT_TARGET_LINKADDR 2 #define ND_OPT_PREFIX_INFORMATION 3 #define ND_OPT_REDIRECTED_HEADER 4 #define ND_OPT_MTU 5 #define ND_OPT_NONCE 14 /* RFC 3971 */ #define ND_OPT_ROUTE_INFO 24 /* RFC 4191 */ #define ND_OPT_RDNSS 25 /* RFC 6106 */ #define ND_OPT_DNSSL 31 /* RFC 6106 */ #define ND_OPT_MAX 31 struct nd_opt_prefix_info { /* prefix information */ u_int8_t nd_opt_pi_type; u_int8_t nd_opt_pi_len; u_int8_t nd_opt_pi_prefix_len; u_int8_t nd_opt_pi_flags_reserved; u_int32_t nd_opt_pi_valid_time; u_int32_t nd_opt_pi_preferred_time; u_int32_t nd_opt_pi_reserved2; struct in6_addr nd_opt_pi_prefix; } __packed; #define ND_OPT_PI_FLAG_ONLINK 0x80 #define ND_OPT_PI_FLAG_AUTO 0x40 struct nd_opt_rd_hdr { /* redirected header */ u_int8_t nd_opt_rh_type; u_int8_t nd_opt_rh_len; u_int16_t nd_opt_rh_reserved1; u_int32_t nd_opt_rh_reserved2; /* followed by IP header and data */ } __packed; struct nd_opt_mtu { /* MTU option */ u_int8_t nd_opt_mtu_type; u_int8_t nd_opt_mtu_len; u_int16_t nd_opt_mtu_reserved; u_int32_t nd_opt_mtu_mtu; } __packed; #define ND_OPT_NONCE_LEN ((1 * 8) - 2) #if ((ND_OPT_NONCE_LEN + 2) % 8) != 0 #error "(ND_OPT_NONCE_LEN + 2) must be a multiple of 8." #endif struct nd_opt_nonce { /* nonce option */ u_int8_t nd_opt_nonce_type; u_int8_t nd_opt_nonce_len; u_int8_t nd_opt_nonce[ND_OPT_NONCE_LEN]; } __packed; struct nd_opt_route_info { /* route info */ u_int8_t nd_opt_rti_type; u_int8_t nd_opt_rti_len; u_int8_t nd_opt_rti_prefixlen; u_int8_t nd_opt_rti_flags; u_int32_t nd_opt_rti_lifetime; /* prefix follows */ } __packed; struct nd_opt_rdnss { /* RDNSS option (RFC 6106) */ u_int8_t nd_opt_rdnss_type; u_int8_t nd_opt_rdnss_len; u_int16_t nd_opt_rdnss_reserved; u_int32_t nd_opt_rdnss_lifetime; /* followed by list of recursive DNS servers */ } __packed; struct nd_opt_dnssl { /* DNSSL option (RFC 6106) */ u_int8_t nd_opt_dnssl_type; u_int8_t nd_opt_dnssl_len; u_int16_t nd_opt_dnssl_reserved; u_int32_t nd_opt_dnssl_lifetime; /* followed by list of DNS search domains */ } __packed; /* * icmp6 namelookup */ struct icmp6_namelookup { struct icmp6_hdr icmp6_nl_hdr; u_int8_t icmp6_nl_nonce[8]; int32_t icmp6_nl_ttl; #if 0 u_int8_t icmp6_nl_len; u_int8_t icmp6_nl_name[3]; #endif /* could be followed by options */ } __packed; /* * icmp6 node information */ struct icmp6_nodeinfo { struct icmp6_hdr icmp6_ni_hdr; u_int8_t icmp6_ni_nonce[8]; /* could be followed by reply data */ } __packed; #define ni_type icmp6_ni_hdr.icmp6_type #define ni_code icmp6_ni_hdr.icmp6_code #define ni_cksum icmp6_ni_hdr.icmp6_cksum #define ni_qtype icmp6_ni_hdr.icmp6_data16[0] #define ni_flags icmp6_ni_hdr.icmp6_data16[1] #define NI_QTYPE_NOOP 0 /* NOOP */ #define NI_QTYPE_SUPTYPES 1 /* Supported Qtypes */ #define NI_QTYPE_FQDN 2 /* FQDN (draft 04) */ #define NI_QTYPE_DNSNAME 2 /* DNS Name */ #define NI_QTYPE_NODEADDR 3 /* Node Addresses */ #define NI_QTYPE_IPV4ADDR 4 /* IPv4 Addresses */ #if BYTE_ORDER == BIG_ENDIAN #define NI_SUPTYPE_FLAG_COMPRESS 0x1 #define NI_FQDN_FLAG_VALIDTTL 0x1 #elif BYTE_ORDER == LITTLE_ENDIAN #define NI_SUPTYPE_FLAG_COMPRESS 0x0100 #define NI_FQDN_FLAG_VALIDTTL 0x0100 #endif #ifdef NAME_LOOKUPS_04 #if BYTE_ORDER == BIG_ENDIAN #define NI_NODEADDR_FLAG_LINKLOCAL 0x1 #define NI_NODEADDR_FLAG_SITELOCAL 0x2 #define NI_NODEADDR_FLAG_GLOBAL 0x4 #define NI_NODEADDR_FLAG_ALL 0x8 #define NI_NODEADDR_FLAG_TRUNCATE 0x10 #define NI_NODEADDR_FLAG_ANYCAST 0x20 /* just experimental. not in spec */ #elif BYTE_ORDER == LITTLE_ENDIAN #define NI_NODEADDR_FLAG_LINKLOCAL 0x0100 #define NI_NODEADDR_FLAG_SITELOCAL 0x0200 #define NI_NODEADDR_FLAG_GLOBAL 0x0400 #define NI_NODEADDR_FLAG_ALL 0x0800 #define NI_NODEADDR_FLAG_TRUNCATE 0x1000 #define NI_NODEADDR_FLAG_ANYCAST 0x2000 /* just experimental. not in spec */ #endif #else /* draft-ietf-ipngwg-icmp-name-lookups-05 (and later?) */ #if BYTE_ORDER == BIG_ENDIAN #define NI_NODEADDR_FLAG_TRUNCATE 0x1 #define NI_NODEADDR_FLAG_ALL 0x2 #define NI_NODEADDR_FLAG_COMPAT 0x4 #define NI_NODEADDR_FLAG_LINKLOCAL 0x8 #define NI_NODEADDR_FLAG_SITELOCAL 0x10 #define NI_NODEADDR_FLAG_GLOBAL 0x20 #define NI_NODEADDR_FLAG_ANYCAST 0x40 /* just experimental. not in spec */ #elif BYTE_ORDER == LITTLE_ENDIAN #define NI_NODEADDR_FLAG_TRUNCATE 0x0100 #define NI_NODEADDR_FLAG_ALL 0x0200 #define NI_NODEADDR_FLAG_COMPAT 0x0400 #define NI_NODEADDR_FLAG_LINKLOCAL 0x0800 #define NI_NODEADDR_FLAG_SITELOCAL 0x1000 #define NI_NODEADDR_FLAG_GLOBAL 0x2000 #define NI_NODEADDR_FLAG_ANYCAST 0x4000 /* just experimental. not in spec */ #endif #endif struct ni_reply_fqdn { u_int32_t ni_fqdn_ttl; /* TTL */ u_int8_t ni_fqdn_namelen; /* length in octets of the FQDN */ u_int8_t ni_fqdn_name[3]; /* XXX: alignment */ } __packed; /* * Router Renumbering. as router-renum-08.txt */ struct icmp6_router_renum { /* router renumbering header */ struct icmp6_hdr rr_hdr; u_int8_t rr_segnum; u_int8_t rr_flags; u_int16_t rr_maxdelay; u_int32_t rr_reserved; } __packed; #define ICMP6_RR_FLAGS_TEST 0x80 #define ICMP6_RR_FLAGS_REQRESULT 0x40 #define ICMP6_RR_FLAGS_FORCEAPPLY 0x20 #define ICMP6_RR_FLAGS_SPECSITE 0x10 #define ICMP6_RR_FLAGS_PREVDONE 0x08 #define rr_type rr_hdr.icmp6_type #define rr_code rr_hdr.icmp6_code #define rr_cksum rr_hdr.icmp6_cksum #define rr_seqnum rr_hdr.icmp6_data32[0] struct rr_pco_match { /* match prefix part */ u_int8_t rpm_code; u_int8_t rpm_len; u_int8_t rpm_ordinal; u_int8_t rpm_matchlen; u_int8_t rpm_minlen; u_int8_t rpm_maxlen; u_int16_t rpm_reserved; struct in6_addr rpm_prefix; } __packed; #define RPM_PCO_ADD 1 #define RPM_PCO_CHANGE 2 #define RPM_PCO_SETGLOBAL 3 #define RPM_PCO_MAX 4 struct rr_pco_use { /* use prefix part */ u_int8_t rpu_uselen; u_int8_t rpu_keeplen; u_int8_t rpu_ramask; u_int8_t rpu_raflags; u_int32_t rpu_vltime; u_int32_t rpu_pltime; u_int32_t rpu_flags; struct in6_addr rpu_prefix; } __packed; #define ICMP6_RR_PCOUSE_RAFLAGS_ONLINK 0x80 #define ICMP6_RR_PCOUSE_RAFLAGS_AUTO 0x40 #if BYTE_ORDER == BIG_ENDIAN #define ICMP6_RR_PCOUSE_FLAGS_DECRVLTIME 0x80000000 #define ICMP6_RR_PCOUSE_FLAGS_DECRPLTIME 0x40000000 #elif BYTE_ORDER == LITTLE_ENDIAN #define ICMP6_RR_PCOUSE_FLAGS_DECRVLTIME 0x80 #define ICMP6_RR_PCOUSE_FLAGS_DECRPLTIME 0x40 #endif struct rr_result { /* router renumbering result message */ u_int16_t rrr_flags; u_int8_t rrr_ordinal; u_int8_t rrr_matchedlen; u_int32_t rrr_ifid; struct in6_addr rrr_prefix; } __packed; #if BYTE_ORDER == BIG_ENDIAN #define ICMP6_RR_RESULT_FLAGS_OOB 0x0002 #define ICMP6_RR_RESULT_FLAGS_FORBIDDEN 0x0001 #elif BYTE_ORDER == LITTLE_ENDIAN #define ICMP6_RR_RESULT_FLAGS_OOB 0x0200 #define ICMP6_RR_RESULT_FLAGS_FORBIDDEN 0x0100 #endif /* * icmp6 filter structures. */ struct icmp6_filter { u_int32_t icmp6_filt[8]; }; #ifdef _KERNEL #define ICMP6_FILTER_SETPASSALL(filterp) \ do { \ int i; u_char *p; \ p = (u_char *)filterp; \ for (i = 0; i < sizeof(struct icmp6_filter); i++) \ p[i] = 0xff; \ } while (/*CONSTCOND*/ 0) #define ICMP6_FILTER_SETBLOCKALL(filterp) \ bzero(filterp, sizeof(struct icmp6_filter)) #else /* _KERNEL */ #define ICMP6_FILTER_SETPASSALL(filterp) \ memset(filterp, 0xff, sizeof(struct icmp6_filter)) #define ICMP6_FILTER_SETBLOCKALL(filterp) \ memset(filterp, 0x00, sizeof(struct icmp6_filter)) #endif /* _KERNEL */ #define ICMP6_FILTER_SETPASS(type, filterp) \ (((filterp)->icmp6_filt[(type) >> 5]) |= (1 << ((type) & 31))) #define ICMP6_FILTER_SETBLOCK(type, filterp) \ (((filterp)->icmp6_filt[(type) >> 5]) &= ~(1 << ((type) & 31))) #define ICMP6_FILTER_WILLPASS(type, filterp) \ ((((filterp)->icmp6_filt[(type) >> 5]) & (1 << ((type) & 31))) != 0) #define ICMP6_FILTER_WILLBLOCK(type, filterp) \ ((((filterp)->icmp6_filt[(type) >> 5]) & (1 << ((type) & 31))) == 0) /* * Variables related to this implementation * of the internet control message protocol version 6. */ struct icmp6errstat { uint64_t icp6errs_dst_unreach_noroute; uint64_t icp6errs_dst_unreach_admin; uint64_t icp6errs_dst_unreach_beyondscope; uint64_t icp6errs_dst_unreach_addr; uint64_t icp6errs_dst_unreach_noport; uint64_t icp6errs_packet_too_big; uint64_t icp6errs_time_exceed_transit; uint64_t icp6errs_time_exceed_reassembly; uint64_t icp6errs_paramprob_header; uint64_t icp6errs_paramprob_nextheader; uint64_t icp6errs_paramprob_option; uint64_t icp6errs_redirect; /* we regard redirect as an error here */ uint64_t icp6errs_unknown; }; struct icmp6stat { /* statistics related to icmp6 packets generated */ uint64_t icp6s_error; /* # of calls to icmp6_error */ uint64_t icp6s_canterror; /* no error 'cuz old was icmp */ uint64_t icp6s_toofreq; /* no error 'cuz rate limitation */ uint64_t icp6s_outhist[256]; /* statistics related to input message processed */ uint64_t icp6s_badcode; /* icmp6_code out of range */ uint64_t icp6s_tooshort; /* packet < sizeof(struct icmp6_hdr) */ uint64_t icp6s_checksum; /* bad checksum */ uint64_t icp6s_badlen; /* calculated bound mismatch */ uint64_t icp6s_dropped; /* # of packets dropped waiting for a resolution */ /* * number of responses: this member is inherited from netinet code, but * for netinet6 code, it is already available in icp6s_outhist[]. */ uint64_t icp6s_reflect; uint64_t icp6s_inhist[256]; uint64_t icp6s_nd_toomanyopt; /* too many ND options */ struct icmp6errstat icp6s_outerrhist; #define icp6s_odst_unreach_noroute \ icp6s_outerrhist.icp6errs_dst_unreach_noroute #define icp6s_odst_unreach_admin icp6s_outerrhist.icp6errs_dst_unreach_admin #define icp6s_odst_unreach_beyondscope \ icp6s_outerrhist.icp6errs_dst_unreach_beyondscope #define icp6s_odst_unreach_addr icp6s_outerrhist.icp6errs_dst_unreach_addr #define icp6s_odst_unreach_noport icp6s_outerrhist.icp6errs_dst_unreach_noport #define icp6s_opacket_too_big icp6s_outerrhist.icp6errs_packet_too_big #define icp6s_otime_exceed_transit \ icp6s_outerrhist.icp6errs_time_exceed_transit #define icp6s_otime_exceed_reassembly \ icp6s_outerrhist.icp6errs_time_exceed_reassembly #define icp6s_oparamprob_header icp6s_outerrhist.icp6errs_paramprob_header #define icp6s_oparamprob_nextheader \ icp6s_outerrhist.icp6errs_paramprob_nextheader #define icp6s_oparamprob_option icp6s_outerrhist.icp6errs_paramprob_option #define icp6s_oredirect icp6s_outerrhist.icp6errs_redirect #define icp6s_ounknown icp6s_outerrhist.icp6errs_unknown uint64_t icp6s_pmtuchg; /* path MTU changes */ uint64_t icp6s_nd_badopt; /* bad ND options */ uint64_t icp6s_badns; /* bad neighbor solicitation */ uint64_t icp6s_badna; /* bad neighbor advertisement */ uint64_t icp6s_badrs; /* bad router solicitation */ uint64_t icp6s_badra; /* bad router advertisement */ uint64_t icp6s_badredirect; /* bad redirect message */ uint64_t icp6s_overflowdefrtr; /* Too many default routers. */ uint64_t icp6s_overflowprfx; /* Too many prefixes. */ uint64_t icp6s_overflownndp; /* Too many neighbour entries. */ uint64_t icp6s_overflowredirect;/* Too many redirects. */ uint64_t icp6s_invlhlim; /* Invalid hop limit. */ uint64_t icp6s_spare[32]; }; #ifdef _KERNEL #include VNET_PCPUSTAT_DECLARE(struct icmp6stat, icmp6stat); /* * In-kernel consumers can use these accessor macros directly to update * stats. */ #define ICMP6STAT_ADD(name, val) \ VNET_PCPUSTAT_ADD(struct icmp6stat, icmp6stat, name, (val)) #define ICMP6STAT_INC(name) ICMP6STAT_ADD(name, 1) /* * Kernel module consumers must use this accessor macro. */ void kmod_icmp6stat_inc(int statnum); #define KMOD_ICMP6STAT_INC(name) \ kmod_icmp6stat_inc(offsetof(struct icmp6stat, name) / sizeof(uint64_t)) #endif /* * Names for ICMP sysctl objects */ #define ICMPV6CTL_STATS 1 #define ICMPV6CTL_REDIRACCEPT 2 /* accept/process redirects */ #define ICMPV6CTL_REDIRTIMEOUT 3 /* redirect cache time */ #if 0 /*obsoleted*/ #define ICMPV6CTL_ERRRATELIMIT 5 /* ICMPv6 error rate limitation */ #endif #define ICMPV6CTL_ND6_PRUNE 6 #define ICMPV6CTL_ND6_DELAY 8 #define ICMPV6CTL_ND6_UMAXTRIES 9 #define ICMPV6CTL_ND6_MMAXTRIES 10 #define ICMPV6CTL_ND6_USELOOPBACK 11 /*#define ICMPV6CTL_ND6_PROXYALL 12 obsoleted, do not reuse here */ #define ICMPV6CTL_NODEINFO 13 #define ICMPV6CTL_ERRPPSLIMIT 14 /* ICMPv6 error pps limitation */ #define ICMPV6CTL_ND6_MAXNUDHINT 15 #define ICMPV6CTL_MTUDISC_HIWAT 16 #define ICMPV6CTL_MTUDISC_LOWAT 17 #define ICMPV6CTL_ND6_DEBUG 18 #define ICMPV6CTL_ND6_DRLIST 19 #define ICMPV6CTL_ND6_PRLIST 20 #define ICMPV6CTL_MLD_MAXSRCFILTER 21 #define ICMPV6CTL_MLD_SOMAXSRC 22 #define ICMPV6CTL_MLD_VERSION 23 #define ICMPV6CTL_ND6_MAXQLEN 24 #define ICMPV6CTL_NODEINFO_OLDMCPREFIX 25 #define ICMPV6CTL_MAXID 26 #ifdef _KERNEL # ifdef __STDC__ struct nhop_object; struct rttimer; struct in6_multi; # endif void icmp6_paramerror(struct mbuf *, int); int icmp6_errmap(const struct icmp6_hdr *); void icmp6_error(struct mbuf *, int, int, int); void icmp6_error2(struct mbuf *, int, int, int, struct ifnet *); int icmp6_input(struct mbuf **, int *, int); void icmp6_prepare(struct mbuf *); void icmp6_redirect_input(struct mbuf *, int); void icmp6_redirect_output(struct mbuf *, struct nhop_object *); +int icmp6_ratelimit(const struct in6_addr *, const int, const int); struct ip6ctlparam; void icmp6_mtudisc_update(struct ip6ctlparam *, int); /* XXX: is this the right place for these macros? */ #define icmp6_ifstat_inc(ifp, tag) \ do { \ if (ifp) \ counter_u64_add(((struct in6_ifextra *) \ ((ifp)->if_afdata[AF_INET6]))->icmp6_ifstat[\ offsetof(struct icmp6_ifstat, tag) / sizeof(uint64_t)], 1);\ } while (/*CONSTCOND*/ 0) #define icmp6_ifoutstat_inc(ifp, type, code) \ do { \ icmp6_ifstat_inc(ifp, ifs6_out_msg); \ if (type < ICMP6_INFOMSG_MASK) \ icmp6_ifstat_inc(ifp, ifs6_out_error); \ switch (type) { \ case ICMP6_DST_UNREACH: \ icmp6_ifstat_inc(ifp, ifs6_out_dstunreach); \ if (code == ICMP6_DST_UNREACH_ADMIN) \ icmp6_ifstat_inc(ifp, ifs6_out_adminprohib); \ break; \ case ICMP6_PACKET_TOO_BIG: \ icmp6_ifstat_inc(ifp, ifs6_out_pkttoobig); \ break; \ case ICMP6_TIME_EXCEEDED: \ icmp6_ifstat_inc(ifp, ifs6_out_timeexceed); \ break; \ case ICMP6_PARAM_PROB: \ icmp6_ifstat_inc(ifp, ifs6_out_paramprob); \ break; \ case ICMP6_ECHO_REQUEST: \ icmp6_ifstat_inc(ifp, ifs6_out_echo); \ break; \ case ICMP6_ECHO_REPLY: \ icmp6_ifstat_inc(ifp, ifs6_out_echoreply); \ break; \ case MLD_LISTENER_QUERY: \ icmp6_ifstat_inc(ifp, ifs6_out_mldquery); \ break; \ case MLD_LISTENER_REPORT: \ icmp6_ifstat_inc(ifp, ifs6_out_mldreport); \ break; \ case MLD_LISTENER_DONE: \ icmp6_ifstat_inc(ifp, ifs6_out_mlddone); \ break; \ case ND_ROUTER_SOLICIT: \ icmp6_ifstat_inc(ifp, ifs6_out_routersolicit); \ break; \ case ND_ROUTER_ADVERT: \ icmp6_ifstat_inc(ifp, ifs6_out_routeradvert); \ break; \ case ND_NEIGHBOR_SOLICIT: \ icmp6_ifstat_inc(ifp, ifs6_out_neighborsolicit); \ break; \ case ND_NEIGHBOR_ADVERT: \ icmp6_ifstat_inc(ifp, ifs6_out_neighboradvert); \ break; \ case ND_REDIRECT: \ icmp6_ifstat_inc(ifp, ifs6_out_redirect); \ break; \ } \ } while (/*CONSTCOND*/ 0) VNET_DECLARE(int, icmp6_rediraccept); /* accept/process redirects */ VNET_DECLARE(int, icmp6_redirtimeout); /* cache time for redirect routes */ #define V_icmp6_rediraccept VNET(icmp6_rediraccept) #define V_icmp6_redirtimeout VNET(icmp6_redirtimeout) #define ICMP6_NODEINFO_FQDNOK 0x1 #define ICMP6_NODEINFO_NODEADDROK 0x2 #define ICMP6_NODEINFO_TMPADDROK 0x4 #define ICMP6_NODEINFO_GLOBALOK 0x8 #endif /* _KERNEL */ #endif /* not _NETINET_ICMP6_H_ */ diff --git a/sys/netinet6/icmp6.c b/sys/netinet6/icmp6.c index 4497041f0330..2cd54abbb76e 100644 --- a/sys/netinet6/icmp6.c +++ b/sys/netinet6/icmp6.c @@ -1,2746 +1,2745 @@ /*- * SPDX-License-Identifier: BSD-3-Clause * * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the project nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * $KAME: icmp6.c,v 1.211 2001/04/04 05:56:20 itojun Exp $ */ /*- * Copyright (c) 1982, 1986, 1988, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)ip_icmp.c 8.2 (Berkeley) 1/4/94 */ #include __FBSDID("$FreeBSD$"); #define MBUF_PRIVATE /* XXXRW: Optimisation tries to avoid M_EXT mbufs */ #include "opt_inet.h" #include "opt_inet6.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include extern ip6proto_ctlinput_t *ip6_ctlprotox[]; VNET_PCPUSTAT_DEFINE(struct icmp6stat, icmp6stat); VNET_PCPUSTAT_SYSINIT(icmp6stat); #ifdef VIMAGE VNET_PCPUSTAT_SYSUNINIT(icmp6stat); #endif /* VIMAGE */ VNET_DECLARE(struct inpcbinfo, ripcbinfo); VNET_DECLARE(int, icmp6errppslim); VNET_DEFINE_STATIC(int, icmp6errpps_count) = 0; VNET_DEFINE_STATIC(struct timeval, icmp6errppslim_last); VNET_DECLARE(int, icmp6_nodeinfo); #define V_ripcbinfo VNET(ripcbinfo) #define V_icmp6errppslim VNET(icmp6errppslim) #define V_icmp6errpps_count VNET(icmp6errpps_count) #define V_icmp6errppslim_last VNET(icmp6errppslim_last) #define V_icmp6_nodeinfo VNET(icmp6_nodeinfo) static void icmp6_errcount(int, int); static int icmp6_rip6_input(struct mbuf **, int); static void icmp6_reflect(struct mbuf *, size_t); -static int icmp6_ratelimit(const struct in6_addr *, const int, const int); static const char *icmp6_redirect_diag(struct in6_addr *, struct in6_addr *, struct in6_addr *); static struct mbuf *ni6_input(struct mbuf *, int, struct prison *); static struct mbuf *ni6_nametodns(const char *, int, int); static int ni6_dnsmatch(const char *, int, const char *, int); static int ni6_addrs(struct icmp6_nodeinfo *, struct mbuf *, struct ifnet **, struct in6_addr *); static int ni6_store_addrs(struct icmp6_nodeinfo *, struct icmp6_nodeinfo *, struct ifnet *, int); static int icmp6_notify_error(struct mbuf **, int, int); /* * Kernel module interface for updating icmp6stat. The argument is an index * into icmp6stat treated as an array of u_quad_t. While this encodes the * general layout of icmp6stat into the caller, it doesn't encode its * location, so that future changes to add, for example, per-CPU stats * support won't cause binary compatibility problems for kernel modules. */ void kmod_icmp6stat_inc(int statnum) { counter_u64_add(VNET(icmp6stat)[statnum], 1); } static void icmp6_errcount(int type, int code) { switch (type) { case ICMP6_DST_UNREACH: switch (code) { case ICMP6_DST_UNREACH_NOROUTE: ICMP6STAT_INC(icp6s_odst_unreach_noroute); return; case ICMP6_DST_UNREACH_ADMIN: ICMP6STAT_INC(icp6s_odst_unreach_admin); return; case ICMP6_DST_UNREACH_BEYONDSCOPE: ICMP6STAT_INC(icp6s_odst_unreach_beyondscope); return; case ICMP6_DST_UNREACH_ADDR: ICMP6STAT_INC(icp6s_odst_unreach_addr); return; case ICMP6_DST_UNREACH_NOPORT: ICMP6STAT_INC(icp6s_odst_unreach_noport); return; } break; case ICMP6_PACKET_TOO_BIG: ICMP6STAT_INC(icp6s_opacket_too_big); return; case ICMP6_TIME_EXCEEDED: switch (code) { case ICMP6_TIME_EXCEED_TRANSIT: ICMP6STAT_INC(icp6s_otime_exceed_transit); return; case ICMP6_TIME_EXCEED_REASSEMBLY: ICMP6STAT_INC(icp6s_otime_exceed_reassembly); return; } break; case ICMP6_PARAM_PROB: switch (code) { case ICMP6_PARAMPROB_HEADER: ICMP6STAT_INC(icp6s_oparamprob_header); return; case ICMP6_PARAMPROB_NEXTHEADER: ICMP6STAT_INC(icp6s_oparamprob_nextheader); return; case ICMP6_PARAMPROB_OPTION: ICMP6STAT_INC(icp6s_oparamprob_option); return; } break; case ND_REDIRECT: ICMP6STAT_INC(icp6s_oredirect); return; } ICMP6STAT_INC(icp6s_ounknown); } /* * A wrapper function for icmp6_error() necessary when the erroneous packet * may not contain enough scope zone information. */ void icmp6_error2(struct mbuf *m, int type, int code, int param, struct ifnet *ifp) { struct ip6_hdr *ip6; if (ifp == NULL) return; if (m->m_len < sizeof(struct ip6_hdr)) { m = m_pullup(m, sizeof(struct ip6_hdr)); if (m == NULL) { IP6STAT_INC(ip6s_exthdrtoolong); return; } } ip6 = mtod(m, struct ip6_hdr *); if (in6_setscope(&ip6->ip6_src, ifp, NULL) != 0) return; if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0) return; icmp6_error(m, type, code, param); } /* * Generate an error packet of type error in response to bad IP6 packet. */ void icmp6_error(struct mbuf *m, int type, int code, int param) { struct ip6_hdr *oip6, *nip6; struct icmp6_hdr *icmp6; struct epoch_tracker et; u_int preplen; int off; int nxt; ICMP6STAT_INC(icp6s_error); /* count per-type-code statistics */ icmp6_errcount(type, code); #ifdef M_DECRYPTED /*not openbsd*/ if (m->m_flags & M_DECRYPTED) { ICMP6STAT_INC(icp6s_canterror); goto freeit; } #endif if (m->m_len < sizeof(struct ip6_hdr)) { m = m_pullup(m, sizeof(struct ip6_hdr)); if (m == NULL) { IP6STAT_INC(ip6s_exthdrtoolong); return; } } oip6 = mtod(m, struct ip6_hdr *); /* * If the destination address of the erroneous packet is a multicast * address, or the packet was sent using link-layer multicast, * we should basically suppress sending an error (RFC 2463, Section * 2.4). * We have two exceptions (the item e.2 in that section): * - the Packet Too Big message can be sent for path MTU discovery. * - the Parameter Problem Message that can be allowed an icmp6 error * in the option type field. This check has been done in * ip6_unknown_opt(), so we can just check the type and code. */ if ((m->m_flags & (M_BCAST|M_MCAST) || IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) && (type != ICMP6_PACKET_TOO_BIG && (type != ICMP6_PARAM_PROB || code != ICMP6_PARAMPROB_OPTION))) goto freeit; /* * RFC 2463, 2.4 (e.5): source address check. * XXX: the case of anycast source? */ if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) || IN6_IS_ADDR_MULTICAST(&oip6->ip6_src)) goto freeit; /* * If we are about to send ICMPv6 against ICMPv6 error/redirect, * don't do it. */ nxt = -1; off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); if (off >= 0 && nxt == IPPROTO_ICMPV6) { struct icmp6_hdr *icp; if (m->m_len < off + sizeof(struct icmp6_hdr)) { m = m_pullup(m, off + sizeof(struct icmp6_hdr)); if (m == NULL) { IP6STAT_INC(ip6s_exthdrtoolong); return; } } oip6 = mtod(m, struct ip6_hdr *); icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); if (icp->icmp6_type < ICMP6_ECHO_REQUEST || icp->icmp6_type == ND_REDIRECT) { /* * ICMPv6 error * Special case: for redirect (which is * informational) we must not send icmp6 error. */ ICMP6STAT_INC(icp6s_canterror); goto freeit; } else { /* ICMPv6 informational - send the error */ } } else { /* non-ICMPv6 - send the error */ } /* Finally, do rate limitation check. */ if (icmp6_ratelimit(&oip6->ip6_src, type, code)) { ICMP6STAT_INC(icp6s_toofreq); goto freeit; } /* * OK, ICMP6 can be generated. */ if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN) m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len); preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); M_PREPEND(m, preplen, M_NOWAIT); /* FIB is also copied over. */ if (m == NULL) { nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__)); return; } nip6 = mtod(m, struct ip6_hdr *); nip6->ip6_src = oip6->ip6_src; nip6->ip6_dst = oip6->ip6_dst; in6_clearscope(&oip6->ip6_src); in6_clearscope(&oip6->ip6_dst); icmp6 = (struct icmp6_hdr *)(nip6 + 1); icmp6->icmp6_type = type; icmp6->icmp6_code = code; icmp6->icmp6_pptr = htonl((u_int32_t)param); ICMP6STAT_INC(icp6s_outhist[type]); NET_EPOCH_ENTER(et); icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */ NET_EPOCH_EXIT(et); return; freeit: /* * If we can't tell whether or not we can generate ICMP6, free it. */ m_freem(m); } int icmp6_errmap(const struct icmp6_hdr *icmp6) { switch (icmp6->icmp6_type) { case ICMP6_DST_UNREACH: switch (icmp6->icmp6_code) { case ICMP6_DST_UNREACH_NOROUTE: case ICMP6_DST_UNREACH_ADDR: return (EHOSTUNREACH); case ICMP6_DST_UNREACH_NOPORT: case ICMP6_DST_UNREACH_ADMIN: return (ECONNREFUSED); case ICMP6_DST_UNREACH_BEYONDSCOPE: return (ENOPROTOOPT); default: return (0); /* Shouldn't happen. */ } case ICMP6_PACKET_TOO_BIG: return (EMSGSIZE); case ICMP6_TIME_EXCEEDED: switch (icmp6->icmp6_code) { case ICMP6_TIME_EXCEED_TRANSIT: return (EHOSTUNREACH); case ICMP6_TIME_EXCEED_REASSEMBLY: return (0); default: return (0); /* Shouldn't happen. */ } case ICMP6_PARAM_PROB: switch (icmp6->icmp6_code) { case ICMP6_PARAMPROB_NEXTHEADER: return (ECONNREFUSED); case ICMP6_PARAMPROB_HEADER: case ICMP6_PARAMPROB_OPTION: return (ENOPROTOOPT); default: return (0); /* Shouldn't happen. */ } default: return (0); } } /* * Process a received ICMP6 message. */ int icmp6_input(struct mbuf **mp, int *offp, int proto) { struct mbuf *m, *n; struct ifnet *ifp; struct ip6_hdr *ip6, *nip6; struct icmp6_hdr *icmp6, *nicmp6; char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; int code, error, icmp6len, ip6len, noff, off, sum; NET_EPOCH_ASSERT(); m = *mp; off = *offp; if (m->m_len < off + sizeof(struct icmp6_hdr)) { m = m_pullup(m, off + sizeof(struct icmp6_hdr)); if (m == NULL) { IP6STAT_INC(ip6s_exthdrtoolong); *mp = m; return (IPPROTO_DONE); } } /* * Locate icmp6 structure in mbuf, and check * that not corrupted and of at least minimum length */ icmp6len = m->m_pkthdr.len - off; if (icmp6len < sizeof(struct icmp6_hdr)) { ICMP6STAT_INC(icp6s_tooshort); goto freeit; } ip6 = mtod(m, struct ip6_hdr *); ifp = m->m_pkthdr.rcvif; /* * Check multicast group membership. * Note: SSM filters are not applied for ICMPv6 traffic. */ if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { struct in6_multi *inm; inm = in6m_lookup(ifp, &ip6->ip6_dst); if (inm == NULL) { IP6STAT_INC(ip6s_notmember); in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); goto freeit; } } /* Calculate the checksum. */ icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off); code = icmp6->icmp6_code; if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) { nd6log((LOG_ERR, "ICMP6 checksum error(%d|%x) %s\n", icmp6->icmp6_type, sum, ip6_sprintf(ip6bufs, &ip6->ip6_src))); ICMP6STAT_INC(icp6s_checksum); goto freeit; } ICMP6STAT_INC(icp6s_inhist[icmp6->icmp6_type]); icmp6_ifstat_inc(ifp, ifs6_in_msg); if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK) icmp6_ifstat_inc(ifp, ifs6_in_error); ip6len = sizeof(struct ip6_hdr) + ntohs(ip6->ip6_plen); switch (icmp6->icmp6_type) { case ICMP6_DST_UNREACH: icmp6_ifstat_inc(ifp, ifs6_in_dstunreach); switch (code) { case ICMP6_DST_UNREACH_ADMIN: icmp6_ifstat_inc(ifp, ifs6_in_adminprohib); case ICMP6_DST_UNREACH_NOROUTE: case ICMP6_DST_UNREACH_ADDR: case ICMP6_DST_UNREACH_BEYONDSCOPE: case ICMP6_DST_UNREACH_NOPORT: goto deliver; default: goto badcode; } case ICMP6_PACKET_TOO_BIG: icmp6_ifstat_inc(ifp, ifs6_in_pkttoobig); /* * Validation is made in icmp6_mtudisc_update. * Updating the path MTU will be done after examining * intermediate extension headers. */ goto deliver; case ICMP6_TIME_EXCEEDED: icmp6_ifstat_inc(ifp, ifs6_in_timeexceed); switch (code) { case ICMP6_TIME_EXCEED_TRANSIT: case ICMP6_TIME_EXCEED_REASSEMBLY: goto deliver; default: goto badcode; } case ICMP6_PARAM_PROB: icmp6_ifstat_inc(ifp, ifs6_in_paramprob); switch (code) { case ICMP6_PARAMPROB_NEXTHEADER: case ICMP6_PARAMPROB_HEADER: case ICMP6_PARAMPROB_OPTION: goto deliver; default: goto badcode; } case ICMP6_ECHO_REQUEST: icmp6_ifstat_inc(ifp, ifs6_in_echo); if (code != 0) goto badcode; if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) { /* Give up remote */ break; } if (!M_WRITABLE(n) || n->m_len < off + sizeof(struct icmp6_hdr)) { struct mbuf *n0 = n; int n0len; CTASSERT(sizeof(*nip6) + sizeof(*nicmp6) <= MHLEN); n = m_gethdr(M_NOWAIT, n0->m_type); if (n == NULL) { /* Give up remote */ m_freem(n0); break; } m_move_pkthdr(n, n0); /* FIB copied. */ n0len = n0->m_pkthdr.len; /* save for use below */ /* * Copy IPv6 and ICMPv6 only. */ nip6 = mtod(n, struct ip6_hdr *); bcopy(ip6, nip6, sizeof(struct ip6_hdr)); nicmp6 = (struct icmp6_hdr *)(nip6 + 1); bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); noff = sizeof(struct ip6_hdr); /* new mbuf contains only ipv6+icmpv6 headers */ n->m_len = noff + sizeof(struct icmp6_hdr); /* * Adjust mbuf. ip6_plen will be adjusted in * ip6_output(). */ m_adj(n0, off + sizeof(struct icmp6_hdr)); /* recalculate complete packet size */ n->m_pkthdr.len = n0len + (noff - off); n->m_next = n0; } else { if (n->m_len < off + sizeof(*nicmp6)) { n = m_pullup(n, off + sizeof(*nicmp6)); if (n == NULL) { IP6STAT_INC(ip6s_exthdrtoolong); break; } } nicmp6 = (struct icmp6_hdr *)(mtod(n, caddr_t) + off); noff = off; } if (n) { nicmp6->icmp6_type = ICMP6_ECHO_REPLY; nicmp6->icmp6_code = 0; ICMP6STAT_INC(icp6s_reflect); ICMP6STAT_INC(icp6s_outhist[ICMP6_ECHO_REPLY]); icmp6_reflect(n, noff); } break; case ICMP6_ECHO_REPLY: icmp6_ifstat_inc(ifp, ifs6_in_echoreply); if (code != 0) goto badcode; break; case MLD_LISTENER_QUERY: case MLD_LISTENER_REPORT: case MLD_LISTENER_DONE: case MLDV2_LISTENER_REPORT: /* * Drop MLD traffic which is not link-local, has a hop limit * of greater than 1 hop, or which does not have the * IPv6 HBH Router Alert option. * As IPv6 HBH options are stripped in ip6_input() we must * check an mbuf header flag. * XXX Should we also sanity check that these messages * were directed to a link-local multicast prefix? */ if ((ip6->ip6_hlim != 1) || (m->m_flags & M_RTALERT_MLD) == 0) goto freeit; if (mld_input(&m, off, icmp6len) != 0) { *mp = NULL; return (IPPROTO_DONE); } /* m stays. */ break; case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */ { enum { WRU, FQDN } mode; struct prison *pr; if (!V_icmp6_nodeinfo) break; if (icmp6len == sizeof(struct icmp6_hdr) + 4) mode = WRU; else if (icmp6len >= sizeof(struct icmp6_nodeinfo)) mode = FQDN; else goto badlen; pr = NULL; sx_slock(&allprison_lock); TAILQ_FOREACH(pr, &allprison, pr_list) if (pr->pr_vnet == ifp->if_vnet) break; sx_sunlock(&allprison_lock); if (pr == NULL) pr = curthread->td_ucred->cr_prison; if (mode == FQDN) { if (m->m_len < off + sizeof(struct icmp6_nodeinfo)) { m = m_pullup(m, off + sizeof(struct icmp6_nodeinfo)); if (m == NULL) { IP6STAT_INC(ip6s_exthdrtoolong); *mp = m; return (IPPROTO_DONE); } } n = m_copym(m, 0, M_COPYALL, M_NOWAIT); if (n) n = ni6_input(n, off, pr); /* XXX meaningless if n == NULL */ noff = sizeof(struct ip6_hdr); } else { u_char *p; int maxhlen, hlen; /* * XXX: this combination of flags is pointless, * but should we keep this for compatibility? */ if ((V_icmp6_nodeinfo & (ICMP6_NODEINFO_FQDNOK | ICMP6_NODEINFO_TMPADDROK)) != (ICMP6_NODEINFO_FQDNOK | ICMP6_NODEINFO_TMPADDROK)) break; if (code != 0) goto badcode; CTASSERT(sizeof(*nip6) + sizeof(*nicmp6) + 4 <= MHLEN); n = m_gethdr(M_NOWAIT, m->m_type); if (n == NULL) { /* Give up remote */ break; } if (!m_dup_pkthdr(n, m, M_NOWAIT)) { /* * Previous code did a blind M_COPY_PKTHDR * and said "just for rcvif". If true, then * we could tolerate the dup failing (due to * the deep copy of the tag chain). For now * be conservative and just fail. */ m_free(n); n = NULL; break; } /* * Copy IPv6 and ICMPv6 only. */ nip6 = mtod(n, struct ip6_hdr *); bcopy(ip6, nip6, sizeof(struct ip6_hdr)); nicmp6 = (struct icmp6_hdr *)(nip6 + 1); bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); p = (u_char *)(nicmp6 + 1); bzero(p, 4); maxhlen = M_TRAILINGSPACE(n) - (sizeof(*nip6) + sizeof(*nicmp6) + 4); mtx_lock(&pr->pr_mtx); hlen = strlen(pr->pr_hostname); if (maxhlen > hlen) maxhlen = hlen; /* meaningless TTL */ bcopy(pr->pr_hostname, p + 4, maxhlen); mtx_unlock(&pr->pr_mtx); noff = sizeof(struct ip6_hdr); n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) + 4 + maxhlen; nicmp6->icmp6_type = ICMP6_WRUREPLY; nicmp6->icmp6_code = 0; } if (n) { ICMP6STAT_INC(icp6s_reflect); ICMP6STAT_INC(icp6s_outhist[ICMP6_WRUREPLY]); icmp6_reflect(n, noff); } break; } case ICMP6_WRUREPLY: if (code != 0) goto badcode; break; case ND_ROUTER_SOLICIT: icmp6_ifstat_inc(ifp, ifs6_in_routersolicit); if (code != 0) goto badcode; if (icmp6len < sizeof(struct nd_router_solicit)) goto badlen; if (send_sendso_input_hook != NULL) { if (m->m_len < off + icmp6len) { m = m_pullup(m, off + icmp6len); if (m == NULL) { IP6STAT_INC(ip6s_exthdrtoolong); *mp = NULL; return (IPPROTO_DONE); } } error = send_sendso_input_hook(m, ifp, SND_IN, ip6len); if (error == 0) { m = NULL; goto freeit; } } n = m_copym(m, 0, M_COPYALL, M_NOWAIT); nd6_rs_input(m, off, icmp6len); m = n; if (m == NULL) goto freeit; break; case ND_ROUTER_ADVERT: icmp6_ifstat_inc(ifp, ifs6_in_routeradvert); if (code != 0) goto badcode; if (icmp6len < sizeof(struct nd_router_advert)) goto badlen; if (send_sendso_input_hook != NULL) { error = send_sendso_input_hook(m, ifp, SND_IN, ip6len); if (error == 0) { m = NULL; goto freeit; } } n = m_copym(m, 0, M_COPYALL, M_NOWAIT); nd6_ra_input(m, off, icmp6len); m = n; if (m == NULL) goto freeit; break; case ND_NEIGHBOR_SOLICIT: icmp6_ifstat_inc(ifp, ifs6_in_neighborsolicit); if (code != 0) goto badcode; if (icmp6len < sizeof(struct nd_neighbor_solicit)) goto badlen; if (send_sendso_input_hook != NULL) { error = send_sendso_input_hook(m, ifp, SND_IN, ip6len); if (error == 0) { m = NULL; goto freeit; } } n = m_copym(m, 0, M_COPYALL, M_NOWAIT); nd6_ns_input(m, off, icmp6len); m = n; if (m == NULL) goto freeit; break; case ND_NEIGHBOR_ADVERT: icmp6_ifstat_inc(ifp, ifs6_in_neighboradvert); if (code != 0) goto badcode; if (icmp6len < sizeof(struct nd_neighbor_advert)) goto badlen; if (send_sendso_input_hook != NULL) { error = send_sendso_input_hook(m, ifp, SND_IN, ip6len); if (error == 0) { m = NULL; goto freeit; } } n = m_copym(m, 0, M_COPYALL, M_NOWAIT); nd6_na_input(m, off, icmp6len); m = n; if (m == NULL) goto freeit; break; case ND_REDIRECT: icmp6_ifstat_inc(ifp, ifs6_in_redirect); if (code != 0) goto badcode; if (icmp6len < sizeof(struct nd_redirect)) goto badlen; if (send_sendso_input_hook != NULL) { error = send_sendso_input_hook(m, ifp, SND_IN, ip6len); if (error == 0) { m = NULL; goto freeit; } } n = m_copym(m, 0, M_COPYALL, M_NOWAIT); icmp6_redirect_input(m, off); m = n; if (m == NULL) goto freeit; break; case ICMP6_ROUTER_RENUMBERING: if (code != ICMP6_ROUTER_RENUMBERING_COMMAND && code != ICMP6_ROUTER_RENUMBERING_RESULT) goto badcode; if (icmp6len < sizeof(struct icmp6_router_renum)) goto badlen; break; default: nd6log((LOG_DEBUG, "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n", icmp6->icmp6_type, ip6_sprintf(ip6bufs, &ip6->ip6_src), ip6_sprintf(ip6bufd, &ip6->ip6_dst), ifp ? ifp->if_index : 0)); if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) { /* ICMPv6 error: MUST deliver it by spec... */ goto deliver; } else { /* ICMPv6 informational: MUST not deliver */ break; } deliver: if (icmp6_notify_error(&m, off, icmp6len) != 0) { /* In this case, m should've been freed. */ *mp = NULL; return (IPPROTO_DONE); } break; badcode: ICMP6STAT_INC(icp6s_badcode); break; badlen: ICMP6STAT_INC(icp6s_badlen); break; } /* deliver the packet to appropriate sockets */ icmp6_rip6_input(&m, *offp); *mp = m; return (IPPROTO_DONE); freeit: m_freem(m); *mp = NULL; return (IPPROTO_DONE); } static int icmp6_notify_error(struct mbuf **mp, int off, int icmp6len) { struct mbuf *m; struct icmp6_hdr *icmp6; struct ip6_hdr *eip6; u_int32_t notifymtu; struct sockaddr_in6 icmp6src, icmp6dst; m = *mp; if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) { ICMP6STAT_INC(icp6s_tooshort); goto freeit; } if (m->m_len < off + sizeof(*icmp6) + sizeof(struct ip6_hdr)) { m = m_pullup(m, off + sizeof(*icmp6) + sizeof(struct ip6_hdr)); if (m == NULL) { IP6STAT_INC(ip6s_exthdrtoolong); *mp = m; return (-1); } } icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); eip6 = (struct ip6_hdr *)(icmp6 + 1); bzero(&icmp6dst, sizeof(icmp6dst)); /* Detect the upper level protocol */ { u_int8_t nxt = eip6->ip6_nxt; int eoff = off + sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr); struct ip6ctlparam ip6cp; int icmp6type = icmp6->icmp6_type; struct ip6_frag *fh; struct ip6_rthdr *rth; struct ip6_rthdr0 *rth0; int rthlen; while (1) { /* XXX: should avoid infinite loop explicitly? */ struct ip6_ext *eh; switch (nxt) { case IPPROTO_HOPOPTS: case IPPROTO_DSTOPTS: case IPPROTO_AH: if (m->m_len < eoff + sizeof(struct ip6_ext)) { m = m_pullup(m, eoff + sizeof(struct ip6_ext)); if (m == NULL) { IP6STAT_INC(ip6s_exthdrtoolong); *mp = m; return (-1); } } eh = (struct ip6_ext *) (mtod(m, caddr_t) + eoff); if (nxt == IPPROTO_AH) eoff += (eh->ip6e_len + 2) << 2; else eoff += (eh->ip6e_len + 1) << 3; nxt = eh->ip6e_nxt; break; case IPPROTO_ROUTING: /* * When the erroneous packet contains a * routing header, we should examine the * header to determine the final destination. * Otherwise, we can't properly update * information that depends on the final * destination (e.g. path MTU). */ if (m->m_len < eoff + sizeof(*rth)) { m = m_pullup(m, eoff + sizeof(*rth)); if (m == NULL) { IP6STAT_INC(ip6s_exthdrtoolong); *mp = m; return (-1); } } rth = (struct ip6_rthdr *) (mtod(m, caddr_t) + eoff); rthlen = (rth->ip6r_len + 1) << 3; /* * XXX: currently there is no * officially defined type other * than type-0. * Note that if the segment left field * is 0, all intermediate hops must * have been passed. */ if (rth->ip6r_segleft && rth->ip6r_type == IPV6_RTHDR_TYPE_0) { int hops; if (m->m_len < eoff + rthlen) { m = m_pullup(m, eoff + rthlen); if (m == NULL) { IP6STAT_INC( ip6s_exthdrtoolong); *mp = m; return (-1); } } rth0 = (struct ip6_rthdr0 *) (mtod(m, caddr_t) + eoff); /* just ignore a bogus header */ if ((rth0->ip6r0_len % 2) == 0 && (hops = rth0->ip6r0_len/2)) icmp6dst.sin6_addr = *((struct in6_addr *)(rth0 + 1) + (hops - 1)); } eoff += rthlen; nxt = rth->ip6r_nxt; break; case IPPROTO_FRAGMENT: if (m->m_len < eoff + sizeof(struct ip6_frag)) { m = m_pullup(m, eoff + sizeof(struct ip6_frag)); if (m == NULL) { IP6STAT_INC(ip6s_exthdrtoolong); *mp = m; return (-1); } } fh = (struct ip6_frag *)(mtod(m, caddr_t) + eoff); /* * Data after a fragment header is meaningless * unless it is the first fragment, but * we'll go to the notify label for path MTU * discovery. */ if (fh->ip6f_offlg & IP6F_OFF_MASK) goto notify; eoff += sizeof(struct ip6_frag); nxt = fh->ip6f_nxt; break; default: /* * This case includes ESP and the No Next * Header. In such cases going to the notify * label does not have any meaning * (i.e. ctlfunc will be NULL), but we go * anyway since we might have to update * path MTU information. */ goto notify; } } notify: icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); /* * retrieve parameters from the inner IPv6 header, and convert * them into sockaddr structures. * XXX: there is no guarantee that the source or destination * addresses of the inner packet are in the same scope as * the addresses of the icmp packet. But there is no other * way to determine the zone. */ eip6 = (struct ip6_hdr *)(icmp6 + 1); icmp6dst.sin6_len = sizeof(struct sockaddr_in6); icmp6dst.sin6_family = AF_INET6; if (IN6_IS_ADDR_UNSPECIFIED(&icmp6dst.sin6_addr)) icmp6dst.sin6_addr = eip6->ip6_dst; if (in6_setscope(&icmp6dst.sin6_addr, m->m_pkthdr.rcvif, NULL)) goto freeit; bzero(&icmp6src, sizeof(icmp6src)); icmp6src.sin6_len = sizeof(struct sockaddr_in6); icmp6src.sin6_family = AF_INET6; icmp6src.sin6_addr = eip6->ip6_src; if (in6_setscope(&icmp6src.sin6_addr, m->m_pkthdr.rcvif, NULL)) goto freeit; icmp6src.sin6_flowinfo = (eip6->ip6_flow & IPV6_FLOWLABEL_MASK); ip6cp.ip6c_m = m; ip6cp.ip6c_icmp6 = icmp6; ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1); ip6cp.ip6c_off = eoff; ip6cp.ip6c_finaldst = &icmp6dst; ip6cp.ip6c_src = &icmp6src; ip6cp.ip6c_nxt = nxt; if (icmp6type == ICMP6_PACKET_TOO_BIG) { notifymtu = ntohl(icmp6->icmp6_mtu); ip6cp.ip6c_cmdarg = (void *)¬ifymtu; icmp6_mtudisc_update(&ip6cp, 1); /*XXX*/ } if (ip6_ctlprotox[nxt] != NULL) ip6_ctlprotox[nxt](&ip6cp); } *mp = m; return (0); freeit: m_freem(m); *mp = NULL; return (-1); } void icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated) { struct in6_addr *dst = &ip6cp->ip6c_finaldst->sin6_addr; struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6; struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */ u_int mtu = ntohl(icmp6->icmp6_mtu); struct in_conninfo inc; uint32_t max_mtu; #if 0 /* * RFC2460 section 5, last paragraph. * even though minimum link MTU for IPv6 is IPV6_MMTU, * we may see ICMPv6 too big with mtu < IPV6_MMTU * due to packet translator in the middle. * see ip6_output() and ip6_getpmtu() "alwaysfrag" case for * special handling. */ if (mtu < IPV6_MMTU) return; #endif /* * we reject ICMPv6 too big with abnormally small value. * XXX what is the good definition of "abnormally small"? */ if (mtu < sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + 8) return; if (!validated) return; /* * In case the suggested mtu is less than IPV6_MMTU, we * only need to remember that it was for above mentioned * "alwaysfrag" case. * Try to be as close to the spec as possible. */ if (mtu < IPV6_MMTU) mtu = IPV6_MMTU - 8; bzero(&inc, sizeof(inc)); inc.inc_fibnum = M_GETFIB(m); inc.inc_flags |= INC_ISIPV6; inc.inc6_faddr = *dst; if (in6_setscope(&inc.inc6_faddr, m->m_pkthdr.rcvif, NULL)) return; max_mtu = tcp_hc_getmtu(&inc); if (max_mtu == 0) max_mtu = tcp_maxmtu6(&inc, NULL); if (mtu < max_mtu) { tcp_hc_updatemtu(&inc, mtu); ICMP6STAT_INC(icp6s_pmtuchg); } } /* * Process a Node Information Query packet, based on * draft-ietf-ipngwg-icmp-name-lookups-07. * * Spec incompatibilities: * - IPv6 Subject address handling * - IPv4 Subject address handling support missing * - Proxy reply (answer even if it's not for me) * - joins NI group address at in6_ifattach() time only, does not cope * with hostname changes by sethostname(3) */ static struct mbuf * ni6_input(struct mbuf *m, int off, struct prison *pr) { struct icmp6_nodeinfo *ni6, *nni6; struct mbuf *n = NULL; u_int16_t qtype; int subjlen; int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); struct ni_reply_fqdn *fqdn; int addrs; /* for NI_QTYPE_NODEADDR */ struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */ struct in6_addr in6_subj; /* subject address */ struct ip6_hdr *ip6; int oldfqdn = 0; /* if 1, return pascal string (03 draft) */ char *subj = NULL; struct in6_ifaddr *ia6 = NULL; ip6 = mtod(m, struct ip6_hdr *); ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off); /* * Validate IPv6 source address. * The default configuration MUST be to refuse answering queries from * global-scope addresses according to RFC4602. * Notes: * - it's not very clear what "refuse" means; this implementation * simply drops it. * - it's not very easy to identify global-scope (unicast) addresses * since there are many prefixes for them. It should be safer * and in practice sufficient to check "all" but loopback and * link-local (note that site-local unicast was deprecated and * ULA is defined as global scope-wise) */ if ((V_icmp6_nodeinfo & ICMP6_NODEINFO_GLOBALOK) == 0 && !IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) && !IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) goto bad; /* * Validate IPv6 destination address. * * The Responder must discard the Query without further processing * unless it is one of the Responder's unicast or anycast addresses, or * a link-local scope multicast address which the Responder has joined. * [RFC4602, Section 5.] */ if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { if (!IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) goto bad; /* else it's a link-local multicast, fine */ } else { /* unicast or anycast */ ia6 = in6ifa_ifwithaddr(&ip6->ip6_dst, 0 /* XXX */, false); if (ia6 == NULL) goto bad; /* XXX impossible */ if ((ia6->ia6_flags & IN6_IFF_TEMPORARY) && !(V_icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK)) { nd6log((LOG_DEBUG, "ni6_input: ignore node info to " "a temporary address in %s:%d", __FILE__, __LINE__)); goto bad; } } /* validate query Subject field. */ qtype = ntohs(ni6->ni_qtype); subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo); switch (qtype) { case NI_QTYPE_NOOP: case NI_QTYPE_SUPTYPES: /* 07 draft */ if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0) break; /* FALLTHROUGH */ case NI_QTYPE_FQDN: case NI_QTYPE_NODEADDR: case NI_QTYPE_IPV4ADDR: switch (ni6->ni_code) { case ICMP6_NI_SUBJ_IPV6: #if ICMP6_NI_SUBJ_IPV6 != 0 case 0: #endif /* * backward compatibility - try to accept 03 draft * format, where no Subject is present. */ if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 && subjlen == 0) { oldfqdn++; break; } #if ICMP6_NI_SUBJ_IPV6 != 0 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6) goto bad; #endif if (subjlen != sizeof(struct in6_addr)) goto bad; /* * Validate Subject address. * * Not sure what exactly "address belongs to the node" * means in the spec, is it just unicast, or what? * * At this moment we consider Subject address as * "belong to the node" if the Subject address equals * to the IPv6 destination address; validation for * IPv6 destination address should have done enough * check for us. * * We do not do proxy at this moment. */ m_copydata(m, off + sizeof(struct icmp6_nodeinfo), subjlen, (caddr_t)&in6_subj); if (in6_setscope(&in6_subj, m->m_pkthdr.rcvif, NULL)) goto bad; subj = (char *)&in6_subj; if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &in6_subj)) break; /* * XXX if we are to allow other cases, we should really * be careful about scope here. * basically, we should disallow queries toward IPv6 * destination X with subject Y, * if scope(X) > scope(Y). * if we allow scope(X) > scope(Y), it will result in * information leakage across scope boundary. */ goto bad; case ICMP6_NI_SUBJ_FQDN: /* * Validate Subject name with gethostname(3). * * The behavior may need some debate, since: * - we are not sure if the node has FQDN as * hostname (returned by gethostname(3)). * - the code does wildcard match for truncated names. * however, we are not sure if we want to perform * wildcard match, if gethostname(3) side has * truncated hostname. */ mtx_lock(&pr->pr_mtx); n = ni6_nametodns(pr->pr_hostname, strlen(pr->pr_hostname), 0); mtx_unlock(&pr->pr_mtx); if (!n || n->m_next || n->m_len == 0) goto bad; if (m->m_len < off + sizeof(struct icmp6_nodeinfo) + subjlen) { m = m_pullup(m, off + sizeof(struct icmp6_nodeinfo) + subjlen); if (m == NULL) { IP6STAT_INC(ip6s_exthdrtoolong); goto bad; } } /* ip6 possibly invalid but not used after. */ ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off); subj = (char *)(mtod(m, caddr_t) + off + sizeof(struct icmp6_nodeinfo)); if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *), n->m_len)) { goto bad; } m_freem(n); n = NULL; break; case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */ default: goto bad; } break; } /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */ switch (qtype) { case NI_QTYPE_FQDN: if ((V_icmp6_nodeinfo & ICMP6_NODEINFO_FQDNOK) == 0) goto bad; break; case NI_QTYPE_NODEADDR: case NI_QTYPE_IPV4ADDR: if ((V_icmp6_nodeinfo & ICMP6_NODEINFO_NODEADDROK) == 0) goto bad; break; } /* guess reply length */ switch (qtype) { case NI_QTYPE_NOOP: break; /* no reply data */ case NI_QTYPE_SUPTYPES: replylen += sizeof(u_int32_t); break; case NI_QTYPE_FQDN: /* XXX will append an mbuf */ replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); break; case NI_QTYPE_NODEADDR: addrs = ni6_addrs(ni6, m, &ifp, (struct in6_addr *)subj); if ((replylen += addrs * (sizeof(struct in6_addr) + sizeof(u_int32_t))) > MCLBYTES) replylen = MCLBYTES; /* XXX: will truncate pkt later */ break; case NI_QTYPE_IPV4ADDR: /* unsupported - should respond with unknown Qtype? */ break; default: /* * XXX: We must return a reply with the ICMP6 code * `unknown Qtype' in this case. However we regard the case * as an FQDN query for backward compatibility. * Older versions set a random value to this field, * so it rarely varies in the defined qtypes. * But the mechanism is not reliable... * maybe we should obsolete older versions. */ qtype = NI_QTYPE_FQDN; /* XXX will append an mbuf */ replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); oldfqdn++; break; } /* Allocate an mbuf to reply. */ if (replylen > MCLBYTES) { /* * XXX: should we try to allocate more? But MCLBYTES * is probably much larger than IPV6_MMTU... */ goto bad; } if (replylen > MHLEN) n = m_getcl(M_NOWAIT, m->m_type, M_PKTHDR); else n = m_gethdr(M_NOWAIT, m->m_type); if (n == NULL) { m_freem(m); return (NULL); } m_move_pkthdr(n, m); /* just for recvif and FIB */ n->m_pkthdr.len = n->m_len = replylen; /* copy mbuf header and IPv6 + Node Information base headers */ bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr)); nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1); bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo)); /* qtype dependent procedure */ switch (qtype) { case NI_QTYPE_NOOP: nni6->ni_code = ICMP6_NI_SUCCESS; nni6->ni_flags = 0; break; case NI_QTYPE_SUPTYPES: { u_int32_t v; nni6->ni_code = ICMP6_NI_SUCCESS; nni6->ni_flags = htons(0x0000); /* raw bitmap */ /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */ v = (u_int32_t)htonl(0x0000000f); bcopy(&v, nni6 + 1, sizeof(u_int32_t)); break; } case NI_QTYPE_FQDN: nni6->ni_code = ICMP6_NI_SUCCESS; fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) + sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo)); nni6->ni_flags = 0; /* XXX: meaningless TTL */ fqdn->ni_fqdn_ttl = 0; /* ditto. */ /* * XXX do we really have FQDN in hostname? */ mtx_lock(&pr->pr_mtx); n->m_next = ni6_nametodns(pr->pr_hostname, strlen(pr->pr_hostname), oldfqdn); mtx_unlock(&pr->pr_mtx); if (n->m_next == NULL) goto bad; /* XXX we assume that n->m_next is not a chain */ if (n->m_next->m_next != NULL) goto bad; n->m_pkthdr.len += n->m_next->m_len; break; case NI_QTYPE_NODEADDR: { int lenlim, copied; nni6->ni_code = ICMP6_NI_SUCCESS; n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); lenlim = M_TRAILINGSPACE(n); copied = ni6_store_addrs(ni6, nni6, ifp, lenlim); /* XXX: reset mbuf length */ n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo) + copied; break; } default: break; /* XXX impossible! */ } nni6->ni_type = ICMP6_NI_REPLY; m_freem(m); return (n); bad: m_freem(m); if (n) m_freem(n); return (NULL); } /* * make a mbuf with DNS-encoded string. no compression support. * * XXX names with less than 2 dots (like "foo" or "foo.section") will be * treated as truncated name (two \0 at the end). this is a wild guess. * * old - return pascal string if non-zero */ static struct mbuf * ni6_nametodns(const char *name, int namelen, int old) { struct mbuf *m; char *cp, *ep; const char *p, *q; int i, len, nterm; if (old) len = namelen + 1; else len = MCLBYTES; /* Because MAXHOSTNAMELEN is usually 256, we use cluster mbuf. */ if (len > MLEN) m = m_getcl(M_NOWAIT, MT_DATA, 0); else m = m_get(M_NOWAIT, MT_DATA); if (m == NULL) goto fail; if (old) { m->m_len = len; *mtod(m, char *) = namelen; bcopy(name, mtod(m, char *) + 1, namelen); return m; } else { m->m_len = 0; cp = mtod(m, char *); ep = mtod(m, char *) + M_TRAILINGSPACE(m); /* if not certain about my name, return empty buffer */ if (namelen == 0) return m; /* * guess if it looks like shortened hostname, or FQDN. * shortened hostname needs two trailing "\0". */ i = 0; for (p = name; p < name + namelen; p++) { if (*p && *p == '.') i++; } if (i < 2) nterm = 2; else nterm = 1; p = name; while (cp < ep && p < name + namelen) { i = 0; for (q = p; q < name + namelen && *q && *q != '.'; q++) i++; /* result does not fit into mbuf */ if (cp + i + 1 >= ep) goto fail; /* * DNS label length restriction, RFC1035 page 8. * "i == 0" case is included here to avoid returning * 0-length label on "foo..bar". */ if (i <= 0 || i >= 64) goto fail; *cp++ = i; bcopy(p, cp, i); cp += i; p = q; if (p < name + namelen && *p == '.') p++; } /* termination */ if (cp + nterm >= ep) goto fail; while (nterm-- > 0) *cp++ = '\0'; m->m_len = cp - mtod(m, char *); return m; } panic("should not reach here"); /* NOTREACHED */ fail: if (m) m_freem(m); return NULL; } /* * check if two DNS-encoded string matches. takes care of truncated * form (with \0\0 at the end). no compression support. * XXX upper/lowercase match (see RFC2065) */ static int ni6_dnsmatch(const char *a, int alen, const char *b, int blen) { const char *a0, *b0; int l; /* simplest case - need validation? */ if (alen == blen && bcmp(a, b, alen) == 0) return 1; a0 = a; b0 = b; /* termination is mandatory */ if (alen < 2 || blen < 2) return 0; if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0') return 0; alen--; blen--; while (a - a0 < alen && b - b0 < blen) { if (a - a0 + 1 > alen || b - b0 + 1 > blen) return 0; if ((signed char)a[0] < 0 || (signed char)b[0] < 0) return 0; /* we don't support compression yet */ if (a[0] >= 64 || b[0] >= 64) return 0; /* truncated case */ if (a[0] == 0 && a - a0 == alen - 1) return 1; if (b[0] == 0 && b - b0 == blen - 1) return 1; if (a[0] == 0 || b[0] == 0) return 0; if (a[0] != b[0]) return 0; l = a[0]; if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen) return 0; if (bcmp(a + 1, b + 1, l) != 0) return 0; a += 1 + l; b += 1 + l; } if (a - a0 == alen && b - b0 == blen) return 1; else return 0; } /* * calculate the number of addresses to be returned in the node info reply. */ static int ni6_addrs(struct icmp6_nodeinfo *ni6, struct mbuf *m, struct ifnet **ifpp, struct in6_addr *subj) { struct ifnet *ifp; struct in6_ifaddr *ifa6; struct ifaddr *ifa; int addrs = 0, addrsofif, iffound = 0; int niflags = ni6->ni_flags; NET_EPOCH_ASSERT(); if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) { switch (ni6->ni_code) { case ICMP6_NI_SUBJ_IPV6: if (subj == NULL) /* must be impossible... */ return (0); break; default: /* * XXX: we only support IPv6 subject address for * this Qtype. */ return (0); } } CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { addrsofif = 0; CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { if (ifa->ifa_addr->sa_family != AF_INET6) continue; ifa6 = (struct in6_ifaddr *)ifa; if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 && IN6_ARE_ADDR_EQUAL(subj, &ifa6->ia_addr.sin6_addr)) iffound = 1; /* * IPv4-mapped addresses can only be returned by a * Node Information proxy, since they represent * addresses of IPv4-only nodes, which perforce do * not implement this protocol. * [icmp-name-lookups-07, Section 5.4] * So we don't support NI_NODEADDR_FLAG_COMPAT in * this function at this moment. */ /* What do we have to do about ::1? */ switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) { case IPV6_ADDR_SCOPE_LINKLOCAL: if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) continue; break; case IPV6_ADDR_SCOPE_SITELOCAL: if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) continue; break; case IPV6_ADDR_SCOPE_GLOBAL: if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) continue; break; default: continue; } /* * check if anycast is okay. * XXX: just experimental. not in the spec. */ if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 && (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) continue; /* we need only unicast addresses */ if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 && (V_icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK) == 0) { continue; } addrsofif++; /* count the address */ } if (iffound) { *ifpp = ifp; return (addrsofif); } addrs += addrsofif; } return (addrs); } static int ni6_store_addrs(struct icmp6_nodeinfo *ni6, struct icmp6_nodeinfo *nni6, struct ifnet *ifp0, int resid) { struct ifnet *ifp; struct in6_ifaddr *ifa6; struct ifaddr *ifa; struct ifnet *ifp_dep = NULL; int copied = 0, allow_deprecated = 0; u_char *cp = (u_char *)(nni6 + 1); int niflags = ni6->ni_flags; u_int32_t ltime; NET_EPOCH_ASSERT(); if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL)) return (0); /* needless to copy */ ifp = ifp0 ? ifp0 : CK_STAILQ_FIRST(&V_ifnet); again: for (; ifp; ifp = CK_STAILQ_NEXT(ifp, if_link)) { CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { if (ifa->ifa_addr->sa_family != AF_INET6) continue; ifa6 = (struct in6_ifaddr *)ifa; if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) != 0 && allow_deprecated == 0) { /* * prefererred address should be put before * deprecated addresses. */ /* record the interface for later search */ if (ifp_dep == NULL) ifp_dep = ifp; continue; } else if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) == 0 && allow_deprecated != 0) continue; /* we now collect deprecated addrs */ /* What do we have to do about ::1? */ switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) { case IPV6_ADDR_SCOPE_LINKLOCAL: if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) continue; break; case IPV6_ADDR_SCOPE_SITELOCAL: if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) continue; break; case IPV6_ADDR_SCOPE_GLOBAL: if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) continue; break; default: continue; } /* * check if anycast is okay. * XXX: just experimental. not in the spec. */ if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 && (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) continue; if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 && (V_icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK) == 0) { continue; } /* now we can copy the address */ if (resid < sizeof(struct in6_addr) + sizeof(u_int32_t)) { /* * We give up much more copy. * Set the truncate flag and return. */ nni6->ni_flags |= NI_NODEADDR_FLAG_TRUNCATE; return (copied); } /* * Set the TTL of the address. * The TTL value should be one of the following * according to the specification: * * 1. The remaining lifetime of a DHCP lease on the * address, or * 2. The remaining Valid Lifetime of a prefix from * which the address was derived through Stateless * Autoconfiguration. * * Note that we currently do not support stateful * address configuration by DHCPv6, so the former * case can't happen. */ if (ifa6->ia6_lifetime.ia6t_expire == 0) ltime = ND6_INFINITE_LIFETIME; else { if (ifa6->ia6_lifetime.ia6t_expire > time_uptime) ltime = htonl(ifa6->ia6_lifetime.ia6t_expire - time_uptime); else ltime = 0; } bcopy(<ime, cp, sizeof(u_int32_t)); cp += sizeof(u_int32_t); /* copy the address itself */ bcopy(&ifa6->ia_addr.sin6_addr, cp, sizeof(struct in6_addr)); in6_clearscope((struct in6_addr *)cp); /* XXX */ cp += sizeof(struct in6_addr); resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t)); copied += (sizeof(struct in6_addr) + sizeof(u_int32_t)); } if (ifp0) /* we need search only on the specified IF */ break; } if (allow_deprecated == 0 && ifp_dep != NULL) { ifp = ifp_dep; allow_deprecated = 1; goto again; } return (copied); } static bool icmp6_rip6_match(const struct inpcb *inp, void *v) { struct ip6_hdr *ip6 = v; if ((inp->inp_vflag & INP_IPV6) == 0) return (false); if (inp->inp_ip_p != IPPROTO_ICMPV6) return (false); if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) && !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &ip6->ip6_dst)) return (false); if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && !IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &ip6->ip6_src)) return (false); return (true); } /* * XXX almost dup'ed code with rip6_input. */ static int icmp6_rip6_input(struct mbuf **mp, int off) { struct mbuf *n, *m = *mp; struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); struct inpcb_iterator inpi = INP_ITERATOR(&V_ripcbinfo, INPLOOKUP_RLOCKPCB, icmp6_rip6_match, ip6); struct inpcb *inp; struct sockaddr_in6 fromsa; struct icmp6_hdr *icmp6; struct mbuf *opts = NULL; int delivered = 0; /* This is assumed to be safe; icmp6_input() does a pullup. */ icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off); /* * XXX: the address may have embedded scope zone ID, which should be * hidden from applications. */ bzero(&fromsa, sizeof(fromsa)); fromsa.sin6_family = AF_INET6; fromsa.sin6_len = sizeof(struct sockaddr_in6); fromsa.sin6_addr = ip6->ip6_src; if (sa6_recoverscope(&fromsa)) { m_freem(m); *mp = NULL; return (IPPROTO_DONE); } while ((inp = inp_next(&inpi)) != NULL) { if (ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type, inp->in6p_icmp6filt)) continue; /* * Recent network drivers tend to allocate a single * mbuf cluster, rather than to make a couple of * mbufs without clusters. Also, since the IPv6 code * path tries to avoid m_pullup(), it is highly * probable that we still have an mbuf cluster here * even though the necessary length can be stored in an * mbuf's internal buffer. * Meanwhile, the default size of the receive socket * buffer for raw sockets is not so large. This means * the possibility of packet loss is relatively higher * than before. To avoid this scenario, we copy the * received data to a separate mbuf that does not use * a cluster, if possible. * XXX: it is better to copy the data after stripping * intermediate headers. */ if ((m->m_flags & M_EXT) && m->m_next == NULL && m->m_len <= MHLEN) { n = m_get(M_NOWAIT, m->m_type); if (n != NULL) { if (m_dup_pkthdr(n, m, M_NOWAIT)) { bcopy(m->m_data, n->m_data, m->m_len); n->m_len = m->m_len; } else { m_free(n); n = NULL; } } } else n = m_copym(m, 0, M_COPYALL, M_NOWAIT); if (n == NULL) continue; if (inp->inp_flags & INP_CONTROLOPTS) ip6_savecontrol(inp, n, &opts); /* strip intermediate headers */ m_adj(n, off); SOCKBUF_LOCK(&inp->inp_socket->so_rcv); if (sbappendaddr_locked(&inp->inp_socket->so_rcv, (struct sockaddr *)&fromsa, n, opts) == 0) { soroverflow_locked(inp->inp_socket); m_freem(n); if (opts) m_freem(opts); } else { sorwakeup_locked(inp->inp_socket); delivered++; } opts = NULL; } m_freem(m); *mp = NULL; if (delivered == 0) IP6STAT_DEC(ip6s_delivered); return (IPPROTO_DONE); } /* * Reflect the ip6 packet back to the source. * OFF points to the icmp6 header, counted from the top of the mbuf. */ static void icmp6_reflect(struct mbuf *m, size_t off) { struct in6_addr src6, *srcp; struct ip6_hdr *ip6; struct icmp6_hdr *icmp6; struct in6_ifaddr *ia = NULL; struct ifnet *outif = NULL; int plen; int type, code, hlim; /* too short to reflect */ if (off < sizeof(struct ip6_hdr)) { nd6log((LOG_DEBUG, "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n", (u_long)off, (u_long)sizeof(struct ip6_hdr), __FILE__, __LINE__)); goto bad; } /* * If there are extra headers between IPv6 and ICMPv6, strip * off that header first. */ #ifdef DIAGNOSTIC if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN) panic("assumption failed in icmp6_reflect"); #endif if (off > sizeof(struct ip6_hdr)) { size_t l; struct ip6_hdr nip6; l = off - sizeof(struct ip6_hdr); m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6); m_adj(m, l); l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); if (m->m_len < l) { if ((m = m_pullup(m, l)) == NULL) return; } bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6)); } else /* off == sizeof(struct ip6_hdr) */ { size_t l; l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); if (m->m_len < l) { if ((m = m_pullup(m, l)) == NULL) return; } } plen = m->m_pkthdr.len - sizeof(struct ip6_hdr); ip6 = mtod(m, struct ip6_hdr *); ip6->ip6_nxt = IPPROTO_ICMPV6; icmp6 = (struct icmp6_hdr *)(ip6 + 1); type = icmp6->icmp6_type; /* keep type for statistics */ code = icmp6->icmp6_code; /* ditto. */ hlim = 0; srcp = NULL; /* * If the incoming packet was addressed directly to us (i.e. unicast), * use dst as the src for the reply. * The IN6_IFF_NOTREADY case should be VERY rare, but is possible * (for example) when we encounter an error while forwarding procedure * destined to a duplicated address of ours. */ if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { ia = in6ifa_ifwithaddr(&ip6->ip6_dst, 0 /* XXX */, false); if (ia != NULL && !(ia->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY))) { src6 = ia->ia_addr.sin6_addr; srcp = &src6; if (m->m_pkthdr.rcvif != NULL) { /* XXX: This may not be the outgoing interface */ hlim = ND_IFINFO(m->m_pkthdr.rcvif)->chlim; } else hlim = V_ip6_defhlim; } } if (srcp == NULL) { int error; struct in6_addr dst6; uint32_t scopeid; /* * This case matches to multicasts, our anycast, or unicasts * that we do not own. Select a source address based on the * source address of the erroneous packet. */ in6_splitscope(&ip6->ip6_src, &dst6, &scopeid); error = in6_selectsrc_addr(M_GETFIB(m), &dst6, scopeid, NULL, &src6, &hlim); if (error) { char ip6buf[INET6_ADDRSTRLEN]; nd6log((LOG_DEBUG, "icmp6_reflect: source can't be determined: " "dst=%s, error=%d\n", ip6_sprintf(ip6buf, &ip6->ip6_dst), error)); goto bad; } srcp = &src6; } /* * ip6_input() drops a packet if its src is multicast. * So, the src is never multicast. */ ip6->ip6_dst = ip6->ip6_src; ip6->ip6_src = *srcp; ip6->ip6_flow = 0; ip6->ip6_vfc &= ~IPV6_VERSION_MASK; ip6->ip6_vfc |= IPV6_VERSION; ip6->ip6_nxt = IPPROTO_ICMPV6; ip6->ip6_hlim = hlim; icmp6->icmp6_cksum = 0; icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), plen); /* * XXX option handling */ m->m_flags &= ~(M_BCAST|M_MCAST); m->m_pkthdr.rcvif = NULL; ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL); if (outif) icmp6_ifoutstat_inc(outif, type, code); return; bad: m_freem(m); return; } static const char * icmp6_redirect_diag(struct in6_addr *src6, struct in6_addr *dst6, struct in6_addr *tgt6) { static char buf[1024]; char ip6bufs[INET6_ADDRSTRLEN]; char ip6bufd[INET6_ADDRSTRLEN]; char ip6buft[INET6_ADDRSTRLEN]; snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)", ip6_sprintf(ip6bufs, src6), ip6_sprintf(ip6bufd, dst6), ip6_sprintf(ip6buft, tgt6)); return buf; } void icmp6_redirect_input(struct mbuf *m, int off) { struct ifnet *ifp; struct ip6_hdr *ip6; struct nd_redirect *nd_rd; struct in6_addr src6, redtgt6, reddst6; union nd_opts ndopts; char ip6buf[INET6_ADDRSTRLEN]; char *lladdr; int icmp6len, is_onlink, is_router, lladdrlen; M_ASSERTPKTHDR(m); KASSERT(m->m_pkthdr.rcvif != NULL, ("%s: no rcvif", __func__)); /* XXX if we are router, we don't update route by icmp6 redirect */ if (V_ip6_forwarding) goto freeit; if (!V_icmp6_rediraccept) goto freeit; /* RFC 6980: Nodes MUST silently ignore fragments */ if(m->m_flags & M_FRAGMENTED) goto freeit; ip6 = mtod(m, struct ip6_hdr *); icmp6len = ntohs(ip6->ip6_plen); if (m->m_len < off + icmp6len) { m = m_pullup(m, off + icmp6len); if (m == NULL) { IP6STAT_INC(ip6s_exthdrtoolong); return; } } ip6 = mtod(m, struct ip6_hdr *); nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off); ifp = m->m_pkthdr.rcvif; redtgt6 = nd_rd->nd_rd_target; reddst6 = nd_rd->nd_rd_dst; if (in6_setscope(&redtgt6, ifp, NULL) || in6_setscope(&reddst6, ifp, NULL)) { goto freeit; } /* validation */ src6 = ip6->ip6_src; if (!IN6_IS_ADDR_LINKLOCAL(&src6)) { nd6log((LOG_ERR, "ICMP6 redirect sent from %s rejected; " "must be from linklocal\n", ip6_sprintf(ip6buf, &src6))); goto bad; } if (__predict_false(ip6->ip6_hlim != 255)) { ICMP6STAT_INC(icp6s_invlhlim); nd6log((LOG_ERR, "ICMP6 redirect sent from %s rejected; " "hlim=%d (must be 255)\n", ip6_sprintf(ip6buf, &src6), ip6->ip6_hlim)); goto bad; } { /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */ struct nhop_object *nh; struct in6_addr kdst; uint32_t scopeid; in6_splitscope(&reddst6, &kdst, &scopeid); NET_EPOCH_ASSERT(); nh = fib6_lookup(ifp->if_fib, &kdst, scopeid, 0, 0); if (nh != NULL) { struct in6_addr nh_addr; nh_addr = ifatoia6(nh->nh_ifa)->ia_addr.sin6_addr; if ((nh->nh_flags & NHF_GATEWAY) == 0) { nd6log((LOG_ERR, "ICMP6 redirect rejected; no route " "with inet6 gateway found for redirect dst: %s\n", icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); goto bad; } /* * Embed scope zone id into next hop address. */ nh_addr = nh->gw6_sa.sin6_addr; if (IN6_ARE_ADDR_EQUAL(&src6, &nh_addr) == 0) { nd6log((LOG_ERR, "ICMP6 redirect rejected; " "not equal to gw-for-src=%s (must be same): " "%s\n", ip6_sprintf(ip6buf, &nh_addr), icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); goto bad; } } else { nd6log((LOG_ERR, "ICMP6 redirect rejected; " "no route found for redirect dst: %s\n", icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); goto bad; } } if (IN6_IS_ADDR_MULTICAST(&reddst6)) { nd6log((LOG_ERR, "ICMP6 redirect rejected; " "redirect dst must be unicast: %s\n", icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); goto bad; } is_router = is_onlink = 0; if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) is_router = 1; /* router case */ if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0) is_onlink = 1; /* on-link destination case */ if (!is_router && !is_onlink) { nd6log((LOG_ERR, "ICMP6 redirect rejected; " "neither router case nor onlink case: %s\n", icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); goto bad; } icmp6len -= sizeof(*nd_rd); nd6_option_init(nd_rd + 1, icmp6len, &ndopts); if (nd6_options(&ndopts) < 0) { nd6log((LOG_INFO, "%s: invalid ND option, rejected: %s\n", __func__, icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); /* nd6_options have incremented stats */ goto freeit; } lladdr = NULL; lladdrlen = 0; if (ndopts.nd_opts_tgt_lladdr) { lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; } if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { nd6log((LOG_INFO, "%s: lladdrlen mismatch for %s " "(if %d, icmp6 packet %d): %s\n", __func__, ip6_sprintf(ip6buf, &redtgt6), ifp->if_addrlen, lladdrlen - 2, icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); goto bad; } /* Validation passed. */ /* RFC 2461 8.3 */ nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT, is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER); /* * Install a gateway route in the better-router case or an interface * route in the on-link-destination case. */ { struct sockaddr_in6 sdst; struct sockaddr_in6 sgw; struct sockaddr_in6 ssrc; struct sockaddr *gw; int rt_flags; u_int fibnum; bzero(&sdst, sizeof(sdst)); bzero(&ssrc, sizeof(ssrc)); sdst.sin6_family = ssrc.sin6_family = AF_INET6; sdst.sin6_len = ssrc.sin6_len = sizeof(struct sockaddr_in6); bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr)); rt_flags = 0; if (is_router) { bzero(&sgw, sizeof(sgw)); sgw.sin6_family = AF_INET6; sgw.sin6_len = sizeof(struct sockaddr_in6); bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr)); gw = (struct sockaddr *)&sgw; rt_flags |= RTF_GATEWAY; } else gw = ifp->if_addr->ifa_addr; for (fibnum = 0; fibnum < rt_numfibs; fibnum++) rib_add_redirect(fibnum, (struct sockaddr *)&sdst, gw, (struct sockaddr *)&ssrc, ifp, rt_flags, V_icmp6_redirtimeout); } freeit: m_freem(m); return; bad: ICMP6STAT_INC(icp6s_badredirect); m_freem(m); } void icmp6_redirect_output(struct mbuf *m0, struct nhop_object *nh) { struct ifnet *ifp; /* my outgoing interface */ struct in6_addr *ifp_ll6; struct in6_addr *router_ll6; struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */ struct mbuf *m = NULL; /* newly allocated one */ struct m_tag *mtag; struct ip6_hdr *ip6; /* m as struct ip6_hdr */ struct nd_redirect *nd_rd; struct llentry *ln = NULL; size_t maxlen; u_char *p; struct ifnet *outif = NULL; struct sockaddr_in6 src_sa; icmp6_errcount(ND_REDIRECT, 0); /* if we are not router, we don't send icmp6 redirect */ if (!V_ip6_forwarding) goto fail; /* sanity check */ if (!m0 || !nh || !(NH_IS_VALID(nh)) || !(ifp = nh->nh_ifp)) goto fail; /* * Address check: * the source address must identify a neighbor, and * the destination address must not be a multicast address * [RFC 2461, sec 8.2] */ sip6 = mtod(m0, struct ip6_hdr *); bzero(&src_sa, sizeof(src_sa)); src_sa.sin6_family = AF_INET6; src_sa.sin6_len = sizeof(src_sa); src_sa.sin6_addr = sip6->ip6_src; if (nd6_is_addr_neighbor(&src_sa, ifp) == 0) goto fail; if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst)) goto fail; /* what should we do here? */ /* rate limit */ if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0)) goto fail; /* * Since we are going to append up to 1280 bytes (= IPV6_MMTU), * we almost always ask for an mbuf cluster for simplicity. * (MHLEN < IPV6_MMTU is almost always true) */ #if IPV6_MMTU >= MCLBYTES # error assumption failed about IPV6_MMTU and MCLBYTES #endif m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); if (m == NULL) goto fail; M_SETFIB(m, M_GETFIB(m0)); maxlen = M_TRAILINGSPACE(m); maxlen = min(IPV6_MMTU, maxlen); /* just for safety */ if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) + ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) { goto fail; } { /* get ip6 linklocal address for ifp(my outgoing interface). */ struct in6_ifaddr *ia; if ((ia = in6ifa_ifpforlinklocal(ifp, IN6_IFF_NOTREADY| IN6_IFF_ANYCAST)) == NULL) goto fail; ifp_ll6 = &ia->ia_addr.sin6_addr; /* XXXRW: reference released prematurely. */ ifa_free(&ia->ia_ifa); } /* get ip6 linklocal address for the router. */ if (nh->nh_flags & NHF_GATEWAY) { struct sockaddr_in6 *sin6; sin6 = &nh->gw6_sa; router_ll6 = &sin6->sin6_addr; if (!IN6_IS_ADDR_LINKLOCAL(router_ll6)) router_ll6 = (struct in6_addr *)NULL; } else router_ll6 = (struct in6_addr *)NULL; /* ip6 */ ip6 = mtod(m, struct ip6_hdr *); ip6->ip6_flow = 0; ip6->ip6_vfc &= ~IPV6_VERSION_MASK; ip6->ip6_vfc |= IPV6_VERSION; /* ip6->ip6_plen will be set later */ ip6->ip6_nxt = IPPROTO_ICMPV6; ip6->ip6_hlim = 255; /* ip6->ip6_src must be linklocal addr for my outgoing if. */ bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr)); bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr)); /* ND Redirect */ nd_rd = (struct nd_redirect *)(ip6 + 1); nd_rd->nd_rd_type = ND_REDIRECT; nd_rd->nd_rd_code = 0; nd_rd->nd_rd_reserved = 0; if (nh->nh_flags & NHF_GATEWAY) { /* * nd_rd->nd_rd_target must be a link-local address in * better router cases. */ if (!router_ll6) goto fail; bcopy(router_ll6, &nd_rd->nd_rd_target, sizeof(nd_rd->nd_rd_target)); bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, sizeof(nd_rd->nd_rd_dst)); } else { /* make sure redtgt == reddst */ bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target, sizeof(nd_rd->nd_rd_target)); bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, sizeof(nd_rd->nd_rd_dst)); } p = (u_char *)(nd_rd + 1); if (!router_ll6) goto nolladdropt; { /* target lladdr option */ int len; struct nd_opt_hdr *nd_opt; char *lladdr; ln = nd6_lookup(router_ll6, LLE_SF(AF_INET6, 0), ifp); if (ln == NULL) goto nolladdropt; len = sizeof(*nd_opt) + ifp->if_addrlen; len = (len + 7) & ~7; /* round by 8 */ /* safety check */ if (len + (p - (u_char *)ip6) > maxlen) goto nolladdropt; if (ln->la_flags & LLE_VALID) { nd_opt = (struct nd_opt_hdr *)p; nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; nd_opt->nd_opt_len = len >> 3; lladdr = (char *)(nd_opt + 1); bcopy(ln->ll_addr, lladdr, ifp->if_addrlen); p += len; } } nolladdropt: if (ln != NULL) LLE_RUNLOCK(ln); m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; /* just to be safe */ #ifdef M_DECRYPTED /*not openbsd*/ if (m0->m_flags & M_DECRYPTED) goto noredhdropt; #endif if (p - (u_char *)ip6 > maxlen) goto noredhdropt; { /* redirected header option */ int len; struct nd_opt_rd_hdr *nd_opt_rh; /* * compute the maximum size for icmp6 redirect header option. * XXX room for auth header? */ len = maxlen - (p - (u_char *)ip6); len &= ~7; /* This is just for simplicity. */ if (m0->m_pkthdr.len != m0->m_len) { if (m0->m_next) { m_freem(m0->m_next); m0->m_next = NULL; } m0->m_pkthdr.len = m0->m_len; } /* * Redirected header option spec (RFC2461 4.6.3) talks nothing * about padding/truncate rule for the original IP packet. * From the discussion on IPv6imp in Feb 1999, * the consensus was: * - "attach as much as possible" is the goal * - pad if not aligned (original size can be guessed by * original ip6 header) * Following code adds the padding if it is simple enough, * and truncates if not. */ if (m0->m_next || m0->m_pkthdr.len != m0->m_len) panic("assumption failed in %s:%d", __FILE__, __LINE__); if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) { /* not enough room, truncate */ m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh); } else { /* enough room, pad or truncate */ size_t extra; extra = m0->m_pkthdr.len % 8; if (extra) { /* pad if easy enough, truncate if not */ if (8 - extra <= M_TRAILINGSPACE(m0)) { /* pad */ m0->m_len += (8 - extra); m0->m_pkthdr.len += (8 - extra); } else { /* truncate */ m0->m_pkthdr.len -= extra; m0->m_len -= extra; } } len = m0->m_pkthdr.len + sizeof(*nd_opt_rh); m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh); } nd_opt_rh = (struct nd_opt_rd_hdr *)p; bzero(nd_opt_rh, sizeof(*nd_opt_rh)); nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER; nd_opt_rh->nd_opt_rh_len = len >> 3; p += sizeof(*nd_opt_rh); m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; /* connect m0 to m */ m_tag_delete_chain(m0, NULL); m0->m_flags &= ~M_PKTHDR; m->m_next = m0; m->m_pkthdr.len = m->m_len + m0->m_len; m0 = NULL; } noredhdropt:; if (m0) { m_freem(m0); m0 = NULL; } /* XXX: clear embedded link IDs in the inner header */ in6_clearscope(&sip6->ip6_src); in6_clearscope(&sip6->ip6_dst); in6_clearscope(&nd_rd->nd_rd_target); in6_clearscope(&nd_rd->nd_rd_dst); ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); nd_rd->nd_rd_cksum = 0; nd_rd->nd_rd_cksum = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen)); if (send_sendso_input_hook != NULL) { mtag = m_tag_get(PACKET_TAG_ND_OUTGOING, sizeof(unsigned short), M_NOWAIT); if (mtag == NULL) goto fail; *(unsigned short *)(mtag + 1) = nd_rd->nd_rd_type; m_tag_prepend(m, mtag); } /* send the packet to outside... */ ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL); if (outif) { icmp6_ifstat_inc(outif, ifs6_out_msg); icmp6_ifstat_inc(outif, ifs6_out_redirect); } ICMP6STAT_INC(icp6s_outhist[ND_REDIRECT]); return; fail: if (m) m_freem(m); if (m0) m_freem(m0); } /* * ICMPv6 socket option processing. */ int icmp6_ctloutput(struct socket *so, struct sockopt *sopt) { int error = 0; int optlen; struct inpcb *inp = sotoinpcb(so); int level, op, optname; if (sopt) { level = sopt->sopt_level; op = sopt->sopt_dir; optname = sopt->sopt_name; optlen = sopt->sopt_valsize; } else level = op = optname = optlen = 0; if (level != IPPROTO_ICMPV6) { return EINVAL; } switch (op) { case PRCO_SETOPT: switch (optname) { case ICMP6_FILTER: { struct icmp6_filter ic6f; if (optlen != sizeof(ic6f)) { error = EMSGSIZE; break; } error = sooptcopyin(sopt, &ic6f, optlen, optlen); if (error == 0) { INP_WLOCK(inp); *inp->in6p_icmp6filt = ic6f; INP_WUNLOCK(inp); } break; } default: error = ENOPROTOOPT; break; } break; case PRCO_GETOPT: switch (optname) { case ICMP6_FILTER: { struct icmp6_filter ic6f; INP_RLOCK(inp); ic6f = *inp->in6p_icmp6filt; INP_RUNLOCK(inp); error = sooptcopyout(sopt, &ic6f, sizeof(ic6f)); break; } default: error = ENOPROTOOPT; break; } break; } return (error); } /* * Perform rate limit check. * Returns 0 if it is okay to send the icmp6 packet. * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate * limitation. * * XXX per-destination/type check necessary? * * dst - not used at this moment * type - not used at this moment * code - not used at this moment */ -static int +int icmp6_ratelimit(const struct in6_addr *dst, const int type, const int code) { int ret; ret = 0; /* okay to send */ /* PPS limit */ if (!ppsratecheck(&V_icmp6errppslim_last, &V_icmp6errpps_count, V_icmp6errppslim)) { /* The packet is subject to rate limit */ ret++; } return ret; } diff --git a/sys/netpfil/pf/pf.c b/sys/netpfil/pf/pf.c index 2a6efbfe6e7d..d0139dc6bd15 100644 --- a/sys/netpfil/pf/pf.c +++ b/sys/netpfil/pf/pf.c @@ -1,7898 +1,7924 @@ /*- * SPDX-License-Identifier: BSD-2-Clause * * Copyright (c) 2001 Daniel Hartmeier * Copyright (c) 2002 - 2008 Henning Brauer * Copyright (c) 2012 Gleb Smirnoff * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * - Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following * disclaimer in the documentation and/or other materials provided * with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * * Effort sponsored in part by the Defense Advanced Research Projects * Agency (DARPA) and Air Force Research Laboratory, Air Force * Materiel Command, USAF, under agreement number F30602-01-2-0537. * * $OpenBSD: pf.c,v 1.634 2009/02/27 12:37:45 henning Exp $ */ #include __FBSDID("$FreeBSD$"); #include "opt_bpf.h" #include "opt_inet.h" #include "opt_inet6.h" #include "opt_pf.h" #include "opt_sctp.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* dummynet */ #include #include #include #include #include #ifdef INET6 #include #include #include #include #include #include #include #endif /* INET6 */ #if defined(SCTP) || defined(SCTP_SUPPORT) #include #endif #include #include #define DPFPRINTF(n, x) if (V_pf_status.debug >= (n)) printf x SDT_PROVIDER_DEFINE(pf); SDT_PROBE_DEFINE4(pf, ip, test, done, "int", "int", "struct pf_krule *", "struct pf_kstate *"); SDT_PROBE_DEFINE4(pf, ip, test6, done, "int", "int", "struct pf_krule *", "struct pf_kstate *"); SDT_PROBE_DEFINE5(pf, ip, state, lookup, "struct pfi_kkif *", "struct pf_state_key_cmp *", "int", "struct pf_pdesc *", "struct pf_kstate *"); SDT_PROBE_DEFINE3(pf, eth, test_rule, entry, "int", "struct ifnet *", "struct mbuf *"); SDT_PROBE_DEFINE2(pf, eth, test_rule, test, "int", "struct pf_keth_rule *"); SDT_PROBE_DEFINE3(pf, eth, test_rule, mismatch, "int", "struct pf_keth_rule *", "char *"); SDT_PROBE_DEFINE2(pf, eth, test_rule, match, "int", "struct pf_keth_rule *"); SDT_PROBE_DEFINE2(pf, eth, test_rule, final_match, "int", "struct pf_keth_rule *"); /* * Global variables */ /* state tables */ VNET_DEFINE(struct pf_altqqueue, pf_altqs[4]); VNET_DEFINE(struct pf_kpalist, pf_pabuf); VNET_DEFINE(struct pf_altqqueue *, pf_altqs_active); VNET_DEFINE(struct pf_altqqueue *, pf_altq_ifs_active); VNET_DEFINE(struct pf_altqqueue *, pf_altqs_inactive); VNET_DEFINE(struct pf_altqqueue *, pf_altq_ifs_inactive); VNET_DEFINE(struct pf_kstatus, pf_status); VNET_DEFINE(u_int32_t, ticket_altqs_active); VNET_DEFINE(u_int32_t, ticket_altqs_inactive); VNET_DEFINE(int, altqs_inactive_open); VNET_DEFINE(u_int32_t, ticket_pabuf); VNET_DEFINE(MD5_CTX, pf_tcp_secret_ctx); #define V_pf_tcp_secret_ctx VNET(pf_tcp_secret_ctx) VNET_DEFINE(u_char, pf_tcp_secret[16]); #define V_pf_tcp_secret VNET(pf_tcp_secret) VNET_DEFINE(int, pf_tcp_secret_init); #define V_pf_tcp_secret_init VNET(pf_tcp_secret_init) VNET_DEFINE(int, pf_tcp_iss_off); #define V_pf_tcp_iss_off VNET(pf_tcp_iss_off) VNET_DECLARE(int, pf_vnet_active); #define V_pf_vnet_active VNET(pf_vnet_active) VNET_DEFINE_STATIC(uint32_t, pf_purge_idx); #define V_pf_purge_idx VNET(pf_purge_idx) #ifdef PF_WANT_32_TO_64_COUNTER VNET_DEFINE_STATIC(uint32_t, pf_counter_periodic_iter); #define V_pf_counter_periodic_iter VNET(pf_counter_periodic_iter) VNET_DEFINE(struct allrulelist_head, pf_allrulelist); VNET_DEFINE(size_t, pf_allrulecount); VNET_DEFINE(struct pf_krule *, pf_rulemarker); #endif /* * Queue for pf_intr() sends. */ static MALLOC_DEFINE(M_PFTEMP, "pf_temp", "pf(4) temporary allocations"); struct pf_send_entry { STAILQ_ENTRY(pf_send_entry) pfse_next; struct mbuf *pfse_m; enum { PFSE_IP, PFSE_IP6, PFSE_ICMP, PFSE_ICMP6, } pfse_type; struct { int type; int code; int mtu; } icmpopts; }; STAILQ_HEAD(pf_send_head, pf_send_entry); VNET_DEFINE_STATIC(struct pf_send_head, pf_sendqueue); #define V_pf_sendqueue VNET(pf_sendqueue) static struct mtx_padalign pf_sendqueue_mtx; MTX_SYSINIT(pf_sendqueue_mtx, &pf_sendqueue_mtx, "pf send queue", MTX_DEF); #define PF_SENDQ_LOCK() mtx_lock(&pf_sendqueue_mtx) #define PF_SENDQ_UNLOCK() mtx_unlock(&pf_sendqueue_mtx) /* * Queue for pf_overload_task() tasks. */ struct pf_overload_entry { SLIST_ENTRY(pf_overload_entry) next; struct pf_addr addr; sa_family_t af; uint8_t dir; struct pf_krule *rule; }; SLIST_HEAD(pf_overload_head, pf_overload_entry); VNET_DEFINE_STATIC(struct pf_overload_head, pf_overloadqueue); #define V_pf_overloadqueue VNET(pf_overloadqueue) VNET_DEFINE_STATIC(struct task, pf_overloadtask); #define V_pf_overloadtask VNET(pf_overloadtask) static struct mtx_padalign pf_overloadqueue_mtx; MTX_SYSINIT(pf_overloadqueue_mtx, &pf_overloadqueue_mtx, "pf overload/flush queue", MTX_DEF); #define PF_OVERLOADQ_LOCK() mtx_lock(&pf_overloadqueue_mtx) #define PF_OVERLOADQ_UNLOCK() mtx_unlock(&pf_overloadqueue_mtx) VNET_DEFINE(struct pf_krulequeue, pf_unlinked_rules); struct mtx_padalign pf_unlnkdrules_mtx; MTX_SYSINIT(pf_unlnkdrules_mtx, &pf_unlnkdrules_mtx, "pf unlinked rules", MTX_DEF); struct sx pf_config_lock; SX_SYSINIT(pf_config_lock, &pf_config_lock, "pf config"); struct mtx_padalign pf_table_stats_lock; MTX_SYSINIT(pf_table_stats_lock, &pf_table_stats_lock, "pf table stats", MTX_DEF); VNET_DEFINE_STATIC(uma_zone_t, pf_sources_z); #define V_pf_sources_z VNET(pf_sources_z) uma_zone_t pf_mtag_z; VNET_DEFINE(uma_zone_t, pf_state_z); VNET_DEFINE(uma_zone_t, pf_state_key_z); VNET_DEFINE(struct unrhdr64, pf_stateid); static void pf_src_tree_remove_state(struct pf_kstate *); static void pf_init_threshold(struct pf_threshold *, u_int32_t, u_int32_t); static void pf_add_threshold(struct pf_threshold *); static int pf_check_threshold(struct pf_threshold *); static void pf_change_ap(struct mbuf *, struct pf_addr *, u_int16_t *, u_int16_t *, u_int16_t *, struct pf_addr *, u_int16_t, u_int8_t, sa_family_t); static int pf_modulate_sack(struct mbuf *, int, struct pf_pdesc *, struct tcphdr *, struct pf_state_peer *); static void pf_change_icmp(struct pf_addr *, u_int16_t *, struct pf_addr *, struct pf_addr *, u_int16_t, u_int16_t *, u_int16_t *, u_int16_t *, u_int16_t *, u_int8_t, sa_family_t); static void pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t, sa_family_t, struct pf_krule *); static void pf_detach_state(struct pf_kstate *); static int pf_state_key_attach(struct pf_state_key *, struct pf_state_key *, struct pf_kstate *); static void pf_state_key_detach(struct pf_kstate *, int); static int pf_state_key_ctor(void *, int, void *, int); static u_int32_t pf_tcp_iss(struct pf_pdesc *); void pf_rule_to_actions(struct pf_krule *, struct pf_rule_actions *); static int pf_dummynet(struct pf_pdesc *, int, struct pf_kstate *, struct pf_krule *, struct mbuf **); static int pf_dummynet_route(struct pf_pdesc *, int, struct pf_kstate *, struct pf_krule *, struct ifnet *, struct sockaddr *, struct mbuf **); static int pf_test_eth_rule(int, struct pfi_kkif *, struct mbuf **); static int pf_test_rule(struct pf_krule **, struct pf_kstate **, int, struct pfi_kkif *, struct mbuf *, int, struct pf_pdesc *, struct pf_krule **, struct pf_kruleset **, struct inpcb *); static int pf_create_state(struct pf_krule *, struct pf_krule *, struct pf_krule *, struct pf_pdesc *, struct pf_ksrc_node *, struct pf_state_key *, struct pf_state_key *, struct mbuf *, int, u_int16_t, u_int16_t, int *, struct pfi_kkif *, struct pf_kstate **, int, u_int16_t, u_int16_t, int); static int pf_test_fragment(struct pf_krule **, int, struct pfi_kkif *, struct mbuf *, void *, struct pf_pdesc *, struct pf_krule **, struct pf_kruleset **); static int pf_tcp_track_full(struct pf_kstate **, struct pfi_kkif *, struct mbuf *, int, struct pf_pdesc *, u_short *, int *); static int pf_tcp_track_sloppy(struct pf_kstate **, struct pf_pdesc *, u_short *); static int pf_test_state_tcp(struct pf_kstate **, int, struct pfi_kkif *, struct mbuf *, int, void *, struct pf_pdesc *, u_short *); static int pf_test_state_udp(struct pf_kstate **, int, struct pfi_kkif *, struct mbuf *, int, void *, struct pf_pdesc *); static int pf_test_state_icmp(struct pf_kstate **, int, struct pfi_kkif *, struct mbuf *, int, void *, struct pf_pdesc *, u_short *); static int pf_test_state_other(struct pf_kstate **, int, struct pfi_kkif *, struct mbuf *, struct pf_pdesc *); static u_int16_t pf_calc_mss(struct pf_addr *, sa_family_t, int, u_int16_t); static int pf_check_proto_cksum(struct mbuf *, int, int, u_int8_t, sa_family_t); static void pf_print_state_parts(struct pf_kstate *, struct pf_state_key *, struct pf_state_key *); static int pf_addr_wrap_neq(struct pf_addr_wrap *, struct pf_addr_wrap *); static void pf_patch_8(struct mbuf *, u_int16_t *, u_int8_t *, u_int8_t, bool, u_int8_t); static struct pf_kstate *pf_find_state(struct pfi_kkif *, struct pf_state_key_cmp *, u_int); static int pf_src_connlimit(struct pf_kstate **); static void pf_overload_task(void *v, int pending); static int pf_insert_src_node(struct pf_ksrc_node **, struct pf_krule *, struct pf_addr *, sa_family_t); static u_int pf_purge_expired_states(u_int, int); static void pf_purge_unlinked_rules(void); static int pf_mtag_uminit(void *, int, int); static void pf_mtag_free(struct m_tag *); static void pf_packet_rework_nat(struct mbuf *, struct pf_pdesc *, int, struct pf_state_key *); #ifdef INET static void pf_route(struct mbuf **, struct pf_krule *, int, struct ifnet *, struct pf_kstate *, struct pf_pdesc *, struct inpcb *); #endif /* INET */ #ifdef INET6 static void pf_change_a6(struct pf_addr *, u_int16_t *, struct pf_addr *, u_int8_t); static void pf_route6(struct mbuf **, struct pf_krule *, int, struct ifnet *, struct pf_kstate *, struct pf_pdesc *, struct inpcb *); #endif /* INET6 */ static __inline void pf_set_protostate(struct pf_kstate *, int, u_int8_t); int in4_cksum(struct mbuf *m, u_int8_t nxt, int off, int len); extern int pf_end_threads; extern struct proc *pf_purge_proc; VNET_DEFINE(struct pf_limit, pf_limits[PF_LIMIT_MAX]); #define PACKET_UNDO_NAT(_m, _pd, _off, _s, _dir) \ do { \ struct pf_state_key *nk; \ if ((_dir) == PF_OUT) \ nk = (_s)->key[PF_SK_STACK]; \ else \ nk = (_s)->key[PF_SK_WIRE]; \ pf_packet_rework_nat(_m, _pd, _off, nk); \ } while (0) #define PACKET_LOOPED(pd) ((pd)->pf_mtag && \ (pd)->pf_mtag->flags & PF_PACKET_LOOPED) #define STATE_LOOKUP(i, k, d, s, pd) \ do { \ (s) = pf_find_state((i), (k), (d)); \ SDT_PROBE5(pf, ip, state, lookup, i, k, d, pd, (s)); \ if ((s) == NULL) \ return (PF_DROP); \ if (PACKET_LOOPED(pd)) \ return (PF_PASS); \ } while (0) #define BOUND_IFACE(r, k) \ ((r)->rule_flag & PFRULE_IFBOUND) ? (k) : V_pfi_all #define STATE_INC_COUNTERS(s) \ do { \ counter_u64_add(s->rule.ptr->states_cur, 1); \ counter_u64_add(s->rule.ptr->states_tot, 1); \ if (s->anchor.ptr != NULL) { \ counter_u64_add(s->anchor.ptr->states_cur, 1); \ counter_u64_add(s->anchor.ptr->states_tot, 1); \ } \ if (s->nat_rule.ptr != NULL) { \ counter_u64_add(s->nat_rule.ptr->states_cur, 1);\ counter_u64_add(s->nat_rule.ptr->states_tot, 1);\ } \ } while (0) #define STATE_DEC_COUNTERS(s) \ do { \ if (s->nat_rule.ptr != NULL) \ counter_u64_add(s->nat_rule.ptr->states_cur, -1);\ if (s->anchor.ptr != NULL) \ counter_u64_add(s->anchor.ptr->states_cur, -1); \ counter_u64_add(s->rule.ptr->states_cur, -1); \ } while (0) MALLOC_DEFINE(M_PFHASH, "pf_hash", "pf(4) hash header structures"); VNET_DEFINE(struct pf_keyhash *, pf_keyhash); VNET_DEFINE(struct pf_idhash *, pf_idhash); VNET_DEFINE(struct pf_srchash *, pf_srchash); SYSCTL_NODE(_net, OID_AUTO, pf, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, "pf(4)"); u_long pf_hashmask; u_long pf_srchashmask; static u_long pf_hashsize; static u_long pf_srchashsize; u_long pf_ioctl_maxcount = 65535; SYSCTL_ULONG(_net_pf, OID_AUTO, states_hashsize, CTLFLAG_RDTUN, &pf_hashsize, 0, "Size of pf(4) states hashtable"); SYSCTL_ULONG(_net_pf, OID_AUTO, source_nodes_hashsize, CTLFLAG_RDTUN, &pf_srchashsize, 0, "Size of pf(4) source nodes hashtable"); SYSCTL_ULONG(_net_pf, OID_AUTO, request_maxcount, CTLFLAG_RWTUN, &pf_ioctl_maxcount, 0, "Maximum number of tables, addresses, ... in a single ioctl() call"); VNET_DEFINE(void *, pf_swi_cookie); VNET_DEFINE(struct intr_event *, pf_swi_ie); VNET_DEFINE(uint32_t, pf_hashseed); #define V_pf_hashseed VNET(pf_hashseed) int pf_addr_cmp(struct pf_addr *a, struct pf_addr *b, sa_family_t af) { switch (af) { #ifdef INET case AF_INET: if (a->addr32[0] > b->addr32[0]) return (1); if (a->addr32[0] < b->addr32[0]) return (-1); break; #endif /* INET */ #ifdef INET6 case AF_INET6: if (a->addr32[3] > b->addr32[3]) return (1); if (a->addr32[3] < b->addr32[3]) return (-1); if (a->addr32[2] > b->addr32[2]) return (1); if (a->addr32[2] < b->addr32[2]) return (-1); if (a->addr32[1] > b->addr32[1]) return (1); if (a->addr32[1] < b->addr32[1]) return (-1); if (a->addr32[0] > b->addr32[0]) return (1); if (a->addr32[0] < b->addr32[0]) return (-1); break; #endif /* INET6 */ default: panic("%s: unknown address family %u", __func__, af); } return (0); } static void pf_packet_rework_nat(struct mbuf *m, struct pf_pdesc *pd, int off, struct pf_state_key *nk) { switch (pd->proto) { case IPPROTO_TCP: { struct tcphdr *th = &pd->hdr.tcp; if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af)) pf_change_ap(m, pd->src, &th->th_sport, pd->ip_sum, &th->th_sum, &nk->addr[pd->sidx], nk->port[pd->sidx], 0, pd->af); if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af)) pf_change_ap(m, pd->dst, &th->th_dport, pd->ip_sum, &th->th_sum, &nk->addr[pd->didx], nk->port[pd->didx], 0, pd->af); m_copyback(m, off, sizeof(*th), (caddr_t)th); break; } case IPPROTO_UDP: { struct udphdr *uh = &pd->hdr.udp; if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af)) pf_change_ap(m, pd->src, &uh->uh_sport, pd->ip_sum, &uh->uh_sum, &nk->addr[pd->sidx], nk->port[pd->sidx], 1, pd->af); if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af)) pf_change_ap(m, pd->dst, &uh->uh_dport, pd->ip_sum, &uh->uh_sum, &nk->addr[pd->didx], nk->port[pd->didx], 1, pd->af); m_copyback(m, off, sizeof(*uh), (caddr_t)uh); break; } case IPPROTO_ICMP: { struct icmp *ih = &pd->hdr.icmp; if (nk->port[pd->sidx] != ih->icmp_id) { pd->hdr.icmp.icmp_cksum = pf_cksum_fixup( ih->icmp_cksum, ih->icmp_id, nk->port[pd->sidx], 0); ih->icmp_id = nk->port[pd->sidx]; pd->sport = &ih->icmp_id; m_copyback(m, off, ICMP_MINLEN, (caddr_t)ih); } /* FALLTHROUGH */ } default: if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af)) { switch (pd->af) { case AF_INET: pf_change_a(&pd->src->v4.s_addr, pd->ip_sum, nk->addr[pd->sidx].v4.s_addr, 0); break; case AF_INET6: PF_ACPY(pd->src, &nk->addr[pd->sidx], pd->af); break; } } if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af)) { switch (pd->af) { case AF_INET: pf_change_a(&pd->dst->v4.s_addr, pd->ip_sum, nk->addr[pd->didx].v4.s_addr, 0); break; case AF_INET6: PF_ACPY(pd->dst, &nk->addr[pd->didx], pd->af); break; } } break; } } static __inline uint32_t pf_hashkey(struct pf_state_key *sk) { uint32_t h; h = murmur3_32_hash32((uint32_t *)sk, sizeof(struct pf_state_key_cmp)/sizeof(uint32_t), V_pf_hashseed); return (h & pf_hashmask); } static __inline uint32_t pf_hashsrc(struct pf_addr *addr, sa_family_t af) { uint32_t h; switch (af) { case AF_INET: h = murmur3_32_hash32((uint32_t *)&addr->v4, sizeof(addr->v4)/sizeof(uint32_t), V_pf_hashseed); break; case AF_INET6: h = murmur3_32_hash32((uint32_t *)&addr->v6, sizeof(addr->v6)/sizeof(uint32_t), V_pf_hashseed); break; default: panic("%s: unknown address family %u", __func__, af); } return (h & pf_srchashmask); } #ifdef ALTQ static int pf_state_hash(struct pf_kstate *s) { u_int32_t hv = (intptr_t)s / sizeof(*s); hv ^= crc32(&s->src, sizeof(s->src)); hv ^= crc32(&s->dst, sizeof(s->dst)); if (hv == 0) hv = 1; return (hv); } #endif static __inline void pf_set_protostate(struct pf_kstate *s, int which, u_int8_t newstate) { if (which == PF_PEER_DST || which == PF_PEER_BOTH) s->dst.state = newstate; if (which == PF_PEER_DST) return; if (s->src.state == newstate) return; if (s->creatorid == V_pf_status.hostid && s->key[PF_SK_STACK] != NULL && s->key[PF_SK_STACK]->proto == IPPROTO_TCP && !(TCPS_HAVEESTABLISHED(s->src.state) || s->src.state == TCPS_CLOSED) && (TCPS_HAVEESTABLISHED(newstate) || newstate == TCPS_CLOSED)) atomic_add_32(&V_pf_status.states_halfopen, -1); s->src.state = newstate; } #ifdef INET6 void pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af) { switch (af) { #ifdef INET case AF_INET: dst->addr32[0] = src->addr32[0]; break; #endif /* INET */ case AF_INET6: dst->addr32[0] = src->addr32[0]; dst->addr32[1] = src->addr32[1]; dst->addr32[2] = src->addr32[2]; dst->addr32[3] = src->addr32[3]; break; } } #endif /* INET6 */ static void pf_init_threshold(struct pf_threshold *threshold, u_int32_t limit, u_int32_t seconds) { threshold->limit = limit * PF_THRESHOLD_MULT; threshold->seconds = seconds; threshold->count = 0; threshold->last = time_uptime; } static void pf_add_threshold(struct pf_threshold *threshold) { u_int32_t t = time_uptime, diff = t - threshold->last; if (diff >= threshold->seconds) threshold->count = 0; else threshold->count -= threshold->count * diff / threshold->seconds; threshold->count += PF_THRESHOLD_MULT; threshold->last = t; } static int pf_check_threshold(struct pf_threshold *threshold) { return (threshold->count > threshold->limit); } static int pf_src_connlimit(struct pf_kstate **state) { struct pf_overload_entry *pfoe; int bad = 0; PF_STATE_LOCK_ASSERT(*state); (*state)->src_node->conn++; (*state)->src.tcp_est = 1; pf_add_threshold(&(*state)->src_node->conn_rate); if ((*state)->rule.ptr->max_src_conn && (*state)->rule.ptr->max_src_conn < (*state)->src_node->conn) { counter_u64_add(V_pf_status.lcounters[LCNT_SRCCONN], 1); bad++; } if ((*state)->rule.ptr->max_src_conn_rate.limit && pf_check_threshold(&(*state)->src_node->conn_rate)) { counter_u64_add(V_pf_status.lcounters[LCNT_SRCCONNRATE], 1); bad++; } if (!bad) return (0); /* Kill this state. */ (*state)->timeout = PFTM_PURGE; pf_set_protostate(*state, PF_PEER_BOTH, TCPS_CLOSED); if ((*state)->rule.ptr->overload_tbl == NULL) return (1); /* Schedule overloading and flushing task. */ pfoe = malloc(sizeof(*pfoe), M_PFTEMP, M_NOWAIT); if (pfoe == NULL) return (1); /* too bad :( */ bcopy(&(*state)->src_node->addr, &pfoe->addr, sizeof(pfoe->addr)); pfoe->af = (*state)->key[PF_SK_WIRE]->af; pfoe->rule = (*state)->rule.ptr; pfoe->dir = (*state)->direction; PF_OVERLOADQ_LOCK(); SLIST_INSERT_HEAD(&V_pf_overloadqueue, pfoe, next); PF_OVERLOADQ_UNLOCK(); taskqueue_enqueue(taskqueue_swi, &V_pf_overloadtask); return (1); } static void pf_overload_task(void *v, int pending) { struct pf_overload_head queue; struct pfr_addr p; struct pf_overload_entry *pfoe, *pfoe1; uint32_t killed = 0; CURVNET_SET((struct vnet *)v); PF_OVERLOADQ_LOCK(); queue = V_pf_overloadqueue; SLIST_INIT(&V_pf_overloadqueue); PF_OVERLOADQ_UNLOCK(); bzero(&p, sizeof(p)); SLIST_FOREACH(pfoe, &queue, next) { counter_u64_add(V_pf_status.lcounters[LCNT_OVERLOAD_TABLE], 1); if (V_pf_status.debug >= PF_DEBUG_MISC) { printf("%s: blocking address ", __func__); pf_print_host(&pfoe->addr, 0, pfoe->af); printf("\n"); } p.pfra_af = pfoe->af; switch (pfoe->af) { #ifdef INET case AF_INET: p.pfra_net = 32; p.pfra_ip4addr = pfoe->addr.v4; break; #endif #ifdef INET6 case AF_INET6: p.pfra_net = 128; p.pfra_ip6addr = pfoe->addr.v6; break; #endif } PF_RULES_WLOCK(); pfr_insert_kentry(pfoe->rule->overload_tbl, &p, time_second); PF_RULES_WUNLOCK(); } /* * Remove those entries, that don't need flushing. */ SLIST_FOREACH_SAFE(pfoe, &queue, next, pfoe1) if (pfoe->rule->flush == 0) { SLIST_REMOVE(&queue, pfoe, pf_overload_entry, next); free(pfoe, M_PFTEMP); } else counter_u64_add( V_pf_status.lcounters[LCNT_OVERLOAD_FLUSH], 1); /* If nothing to flush, return. */ if (SLIST_EMPTY(&queue)) { CURVNET_RESTORE(); return; } for (int i = 0; i <= pf_hashmask; i++) { struct pf_idhash *ih = &V_pf_idhash[i]; struct pf_state_key *sk; struct pf_kstate *s; PF_HASHROW_LOCK(ih); LIST_FOREACH(s, &ih->states, entry) { sk = s->key[PF_SK_WIRE]; SLIST_FOREACH(pfoe, &queue, next) if (sk->af == pfoe->af && ((pfoe->rule->flush & PF_FLUSH_GLOBAL) || pfoe->rule == s->rule.ptr) && ((pfoe->dir == PF_OUT && PF_AEQ(&pfoe->addr, &sk->addr[1], sk->af)) || (pfoe->dir == PF_IN && PF_AEQ(&pfoe->addr, &sk->addr[0], sk->af)))) { s->timeout = PFTM_PURGE; pf_set_protostate(s, PF_PEER_BOTH, TCPS_CLOSED); killed++; } } PF_HASHROW_UNLOCK(ih); } SLIST_FOREACH_SAFE(pfoe, &queue, next, pfoe1) free(pfoe, M_PFTEMP); if (V_pf_status.debug >= PF_DEBUG_MISC) printf("%s: %u states killed", __func__, killed); CURVNET_RESTORE(); } /* * Can return locked on failure, so that we can consistently * allocate and insert a new one. */ struct pf_ksrc_node * pf_find_src_node(struct pf_addr *src, struct pf_krule *rule, sa_family_t af, int returnlocked) { struct pf_srchash *sh; struct pf_ksrc_node *n; counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_SEARCH], 1); sh = &V_pf_srchash[pf_hashsrc(src, af)]; PF_HASHROW_LOCK(sh); LIST_FOREACH(n, &sh->nodes, entry) if (n->rule.ptr == rule && n->af == af && ((af == AF_INET && n->addr.v4.s_addr == src->v4.s_addr) || (af == AF_INET6 && bcmp(&n->addr, src, sizeof(*src)) == 0))) break; if (n != NULL) { n->states++; PF_HASHROW_UNLOCK(sh); } else if (returnlocked == 0) PF_HASHROW_UNLOCK(sh); return (n); } static void pf_free_src_node(struct pf_ksrc_node *sn) { for (int i = 0; i < 2; i++) { counter_u64_free(sn->bytes[i]); counter_u64_free(sn->packets[i]); } uma_zfree(V_pf_sources_z, sn); } static int pf_insert_src_node(struct pf_ksrc_node **sn, struct pf_krule *rule, struct pf_addr *src, sa_family_t af) { KASSERT((rule->rule_flag & PFRULE_SRCTRACK || rule->rpool.opts & PF_POOL_STICKYADDR), ("%s for non-tracking rule %p", __func__, rule)); if (*sn == NULL) *sn = pf_find_src_node(src, rule, af, 1); if (*sn == NULL) { struct pf_srchash *sh = &V_pf_srchash[pf_hashsrc(src, af)]; PF_HASHROW_ASSERT(sh); if (!rule->max_src_nodes || counter_u64_fetch(rule->src_nodes) < rule->max_src_nodes) (*sn) = uma_zalloc(V_pf_sources_z, M_NOWAIT | M_ZERO); else counter_u64_add(V_pf_status.lcounters[LCNT_SRCNODES], 1); if ((*sn) == NULL) { PF_HASHROW_UNLOCK(sh); return (-1); } for (int i = 0; i < 2; i++) { (*sn)->bytes[i] = counter_u64_alloc(M_NOWAIT); (*sn)->packets[i] = counter_u64_alloc(M_NOWAIT); if ((*sn)->bytes[i] == NULL || (*sn)->packets[i] == NULL) { pf_free_src_node(*sn); PF_HASHROW_UNLOCK(sh); return (-1); } } pf_init_threshold(&(*sn)->conn_rate, rule->max_src_conn_rate.limit, rule->max_src_conn_rate.seconds); (*sn)->af = af; (*sn)->rule.ptr = rule; PF_ACPY(&(*sn)->addr, src, af); LIST_INSERT_HEAD(&sh->nodes, *sn, entry); (*sn)->creation = time_uptime; (*sn)->ruletype = rule->action; (*sn)->states = 1; if ((*sn)->rule.ptr != NULL) counter_u64_add((*sn)->rule.ptr->src_nodes, 1); PF_HASHROW_UNLOCK(sh); counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_INSERT], 1); } else { if (rule->max_src_states && (*sn)->states >= rule->max_src_states) { counter_u64_add(V_pf_status.lcounters[LCNT_SRCSTATES], 1); return (-1); } } return (0); } void pf_unlink_src_node(struct pf_ksrc_node *src) { PF_HASHROW_ASSERT(&V_pf_srchash[pf_hashsrc(&src->addr, src->af)]); LIST_REMOVE(src, entry); if (src->rule.ptr) counter_u64_add(src->rule.ptr->src_nodes, -1); } u_int pf_free_src_nodes(struct pf_ksrc_node_list *head) { struct pf_ksrc_node *sn, *tmp; u_int count = 0; LIST_FOREACH_SAFE(sn, head, entry, tmp) { pf_free_src_node(sn); count++; } counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], count); return (count); } void pf_mtag_initialize(void) { pf_mtag_z = uma_zcreate("pf mtags", sizeof(struct m_tag) + sizeof(struct pf_mtag), NULL, NULL, pf_mtag_uminit, NULL, UMA_ALIGN_PTR, 0); } /* Per-vnet data storage structures initialization. */ void pf_initialize(void) { struct pf_keyhash *kh; struct pf_idhash *ih; struct pf_srchash *sh; u_int i; if (pf_hashsize == 0 || !powerof2(pf_hashsize)) pf_hashsize = PF_HASHSIZ; if (pf_srchashsize == 0 || !powerof2(pf_srchashsize)) pf_srchashsize = PF_SRCHASHSIZ; V_pf_hashseed = arc4random(); /* States and state keys storage. */ V_pf_state_z = uma_zcreate("pf states", sizeof(struct pf_kstate), NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); V_pf_limits[PF_LIMIT_STATES].zone = V_pf_state_z; uma_zone_set_max(V_pf_state_z, PFSTATE_HIWAT); uma_zone_set_warning(V_pf_state_z, "PF states limit reached"); V_pf_state_key_z = uma_zcreate("pf state keys", sizeof(struct pf_state_key), pf_state_key_ctor, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); V_pf_keyhash = mallocarray(pf_hashsize, sizeof(struct pf_keyhash), M_PFHASH, M_NOWAIT | M_ZERO); V_pf_idhash = mallocarray(pf_hashsize, sizeof(struct pf_idhash), M_PFHASH, M_NOWAIT | M_ZERO); if (V_pf_keyhash == NULL || V_pf_idhash == NULL) { printf("pf: Unable to allocate memory for " "state_hashsize %lu.\n", pf_hashsize); free(V_pf_keyhash, M_PFHASH); free(V_pf_idhash, M_PFHASH); pf_hashsize = PF_HASHSIZ; V_pf_keyhash = mallocarray(pf_hashsize, sizeof(struct pf_keyhash), M_PFHASH, M_WAITOK | M_ZERO); V_pf_idhash = mallocarray(pf_hashsize, sizeof(struct pf_idhash), M_PFHASH, M_WAITOK | M_ZERO); } pf_hashmask = pf_hashsize - 1; for (i = 0, kh = V_pf_keyhash, ih = V_pf_idhash; i <= pf_hashmask; i++, kh++, ih++) { mtx_init(&kh->lock, "pf_keyhash", NULL, MTX_DEF | MTX_DUPOK); mtx_init(&ih->lock, "pf_idhash", NULL, MTX_DEF); } /* Source nodes. */ V_pf_sources_z = uma_zcreate("pf source nodes", sizeof(struct pf_ksrc_node), NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); V_pf_limits[PF_LIMIT_SRC_NODES].zone = V_pf_sources_z; uma_zone_set_max(V_pf_sources_z, PFSNODE_HIWAT); uma_zone_set_warning(V_pf_sources_z, "PF source nodes limit reached"); V_pf_srchash = mallocarray(pf_srchashsize, sizeof(struct pf_srchash), M_PFHASH, M_NOWAIT | M_ZERO); if (V_pf_srchash == NULL) { printf("pf: Unable to allocate memory for " "source_hashsize %lu.\n", pf_srchashsize); pf_srchashsize = PF_SRCHASHSIZ; V_pf_srchash = mallocarray(pf_srchashsize, sizeof(struct pf_srchash), M_PFHASH, M_WAITOK | M_ZERO); } pf_srchashmask = pf_srchashsize - 1; for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++) mtx_init(&sh->lock, "pf_srchash", NULL, MTX_DEF); /* ALTQ */ TAILQ_INIT(&V_pf_altqs[0]); TAILQ_INIT(&V_pf_altqs[1]); TAILQ_INIT(&V_pf_altqs[2]); TAILQ_INIT(&V_pf_altqs[3]); TAILQ_INIT(&V_pf_pabuf); V_pf_altqs_active = &V_pf_altqs[0]; V_pf_altq_ifs_active = &V_pf_altqs[1]; V_pf_altqs_inactive = &V_pf_altqs[2]; V_pf_altq_ifs_inactive = &V_pf_altqs[3]; /* Send & overload+flush queues. */ STAILQ_INIT(&V_pf_sendqueue); SLIST_INIT(&V_pf_overloadqueue); TASK_INIT(&V_pf_overloadtask, 0, pf_overload_task, curvnet); /* Unlinked, but may be referenced rules. */ TAILQ_INIT(&V_pf_unlinked_rules); } void pf_mtag_cleanup(void) { uma_zdestroy(pf_mtag_z); } void pf_cleanup(void) { struct pf_keyhash *kh; struct pf_idhash *ih; struct pf_srchash *sh; struct pf_send_entry *pfse, *next; u_int i; for (i = 0, kh = V_pf_keyhash, ih = V_pf_idhash; i <= pf_hashmask; i++, kh++, ih++) { KASSERT(LIST_EMPTY(&kh->keys), ("%s: key hash not empty", __func__)); KASSERT(LIST_EMPTY(&ih->states), ("%s: id hash not empty", __func__)); mtx_destroy(&kh->lock); mtx_destroy(&ih->lock); } free(V_pf_keyhash, M_PFHASH); free(V_pf_idhash, M_PFHASH); for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++) { KASSERT(LIST_EMPTY(&sh->nodes), ("%s: source node hash not empty", __func__)); mtx_destroy(&sh->lock); } free(V_pf_srchash, M_PFHASH); STAILQ_FOREACH_SAFE(pfse, &V_pf_sendqueue, pfse_next, next) { m_freem(pfse->pfse_m); free(pfse, M_PFTEMP); } uma_zdestroy(V_pf_sources_z); uma_zdestroy(V_pf_state_z); uma_zdestroy(V_pf_state_key_z); } static int pf_mtag_uminit(void *mem, int size, int how) { struct m_tag *t; t = (struct m_tag *)mem; t->m_tag_cookie = MTAG_ABI_COMPAT; t->m_tag_id = PACKET_TAG_PF; t->m_tag_len = sizeof(struct pf_mtag); t->m_tag_free = pf_mtag_free; return (0); } static void pf_mtag_free(struct m_tag *t) { uma_zfree(pf_mtag_z, t); } struct pf_mtag * pf_get_mtag(struct mbuf *m) { struct m_tag *mtag; if ((mtag = m_tag_find(m, PACKET_TAG_PF, NULL)) != NULL) return ((struct pf_mtag *)(mtag + 1)); mtag = uma_zalloc(pf_mtag_z, M_NOWAIT); if (mtag == NULL) return (NULL); bzero(mtag + 1, sizeof(struct pf_mtag)); m_tag_prepend(m, mtag); return ((struct pf_mtag *)(mtag + 1)); } static int pf_state_key_attach(struct pf_state_key *skw, struct pf_state_key *sks, struct pf_kstate *s) { struct pf_keyhash *khs, *khw, *kh; struct pf_state_key *sk, *cur; struct pf_kstate *si, *olds = NULL; int idx; KASSERT(s->refs == 0, ("%s: state not pristine", __func__)); KASSERT(s->key[PF_SK_WIRE] == NULL, ("%s: state has key", __func__)); KASSERT(s->key[PF_SK_STACK] == NULL, ("%s: state has key", __func__)); /* * We need to lock hash slots of both keys. To avoid deadlock * we always lock the slot with lower address first. Unlock order * isn't important. * * We also need to lock ID hash slot before dropping key * locks. On success we return with ID hash slot locked. */ if (skw == sks) { khs = khw = &V_pf_keyhash[pf_hashkey(skw)]; PF_HASHROW_LOCK(khs); } else { khs = &V_pf_keyhash[pf_hashkey(sks)]; khw = &V_pf_keyhash[pf_hashkey(skw)]; if (khs == khw) { PF_HASHROW_LOCK(khs); } else if (khs < khw) { PF_HASHROW_LOCK(khs); PF_HASHROW_LOCK(khw); } else { PF_HASHROW_LOCK(khw); PF_HASHROW_LOCK(khs); } } #define KEYS_UNLOCK() do { \ if (khs != khw) { \ PF_HASHROW_UNLOCK(khs); \ PF_HASHROW_UNLOCK(khw); \ } else \ PF_HASHROW_UNLOCK(khs); \ } while (0) /* * First run: start with wire key. */ sk = skw; kh = khw; idx = PF_SK_WIRE; MPASS(s->lock == NULL); s->lock = &V_pf_idhash[PF_IDHASH(s)].lock; keyattach: LIST_FOREACH(cur, &kh->keys, entry) if (bcmp(cur, sk, sizeof(struct pf_state_key_cmp)) == 0) break; if (cur != NULL) { /* Key exists. Check for same kif, if none, add to key. */ TAILQ_FOREACH(si, &cur->states[idx], key_list[idx]) { struct pf_idhash *ih = &V_pf_idhash[PF_IDHASH(si)]; PF_HASHROW_LOCK(ih); if (si->kif == s->kif && si->direction == s->direction) { if (sk->proto == IPPROTO_TCP && si->src.state >= TCPS_FIN_WAIT_2 && si->dst.state >= TCPS_FIN_WAIT_2) { /* * New state matches an old >FIN_WAIT_2 * state. We can't drop key hash locks, * thus we can't unlink it properly. * * As a workaround we drop it into * TCPS_CLOSED state, schedule purge * ASAP and push it into the very end * of the slot TAILQ, so that it won't * conflict with our new state. */ pf_set_protostate(si, PF_PEER_BOTH, TCPS_CLOSED); si->timeout = PFTM_PURGE; olds = si; } else { if (V_pf_status.debug >= PF_DEBUG_MISC) { printf("pf: %s key attach " "failed on %s: ", (idx == PF_SK_WIRE) ? "wire" : "stack", s->kif->pfik_name); pf_print_state_parts(s, (idx == PF_SK_WIRE) ? sk : NULL, (idx == PF_SK_STACK) ? sk : NULL); printf(", existing: "); pf_print_state_parts(si, (idx == PF_SK_WIRE) ? sk : NULL, (idx == PF_SK_STACK) ? sk : NULL); printf("\n"); } PF_HASHROW_UNLOCK(ih); KEYS_UNLOCK(); uma_zfree(V_pf_state_key_z, sk); if (idx == PF_SK_STACK) pf_detach_state(s); return (EEXIST); /* collision! */ } } PF_HASHROW_UNLOCK(ih); } uma_zfree(V_pf_state_key_z, sk); s->key[idx] = cur; } else { LIST_INSERT_HEAD(&kh->keys, sk, entry); s->key[idx] = sk; } stateattach: /* List is sorted, if-bound states before floating. */ if (s->kif == V_pfi_all) TAILQ_INSERT_TAIL(&s->key[idx]->states[idx], s, key_list[idx]); else TAILQ_INSERT_HEAD(&s->key[idx]->states[idx], s, key_list[idx]); if (olds) { TAILQ_REMOVE(&s->key[idx]->states[idx], olds, key_list[idx]); TAILQ_INSERT_TAIL(&s->key[idx]->states[idx], olds, key_list[idx]); olds = NULL; } /* * Attach done. See how should we (or should not?) * attach a second key. */ if (sks == skw) { s->key[PF_SK_STACK] = s->key[PF_SK_WIRE]; idx = PF_SK_STACK; sks = NULL; goto stateattach; } else if (sks != NULL) { /* * Continue attaching with stack key. */ sk = sks; kh = khs; idx = PF_SK_STACK; sks = NULL; goto keyattach; } PF_STATE_LOCK(s); KEYS_UNLOCK(); KASSERT(s->key[PF_SK_WIRE] != NULL && s->key[PF_SK_STACK] != NULL, ("%s failure", __func__)); return (0); #undef KEYS_UNLOCK } static void pf_detach_state(struct pf_kstate *s) { struct pf_state_key *sks = s->key[PF_SK_STACK]; struct pf_keyhash *kh; if (sks != NULL) { kh = &V_pf_keyhash[pf_hashkey(sks)]; PF_HASHROW_LOCK(kh); if (s->key[PF_SK_STACK] != NULL) pf_state_key_detach(s, PF_SK_STACK); /* * If both point to same key, then we are done. */ if (sks == s->key[PF_SK_WIRE]) { pf_state_key_detach(s, PF_SK_WIRE); PF_HASHROW_UNLOCK(kh); return; } PF_HASHROW_UNLOCK(kh); } if (s->key[PF_SK_WIRE] != NULL) { kh = &V_pf_keyhash[pf_hashkey(s->key[PF_SK_WIRE])]; PF_HASHROW_LOCK(kh); if (s->key[PF_SK_WIRE] != NULL) pf_state_key_detach(s, PF_SK_WIRE); PF_HASHROW_UNLOCK(kh); } } static void pf_state_key_detach(struct pf_kstate *s, int idx) { struct pf_state_key *sk = s->key[idx]; #ifdef INVARIANTS struct pf_keyhash *kh = &V_pf_keyhash[pf_hashkey(sk)]; PF_HASHROW_ASSERT(kh); #endif TAILQ_REMOVE(&sk->states[idx], s, key_list[idx]); s->key[idx] = NULL; if (TAILQ_EMPTY(&sk->states[0]) && TAILQ_EMPTY(&sk->states[1])) { LIST_REMOVE(sk, entry); uma_zfree(V_pf_state_key_z, sk); } } static int pf_state_key_ctor(void *mem, int size, void *arg, int flags) { struct pf_state_key *sk = mem; bzero(sk, sizeof(struct pf_state_key_cmp)); TAILQ_INIT(&sk->states[PF_SK_WIRE]); TAILQ_INIT(&sk->states[PF_SK_STACK]); return (0); } struct pf_state_key * pf_state_key_setup(struct pf_pdesc *pd, struct pf_addr *saddr, struct pf_addr *daddr, u_int16_t sport, u_int16_t dport) { struct pf_state_key *sk; sk = uma_zalloc(V_pf_state_key_z, M_NOWAIT); if (sk == NULL) return (NULL); PF_ACPY(&sk->addr[pd->sidx], saddr, pd->af); PF_ACPY(&sk->addr[pd->didx], daddr, pd->af); sk->port[pd->sidx] = sport; sk->port[pd->didx] = dport; sk->proto = pd->proto; sk->af = pd->af; return (sk); } struct pf_state_key * pf_state_key_clone(struct pf_state_key *orig) { struct pf_state_key *sk; sk = uma_zalloc(V_pf_state_key_z, M_NOWAIT); if (sk == NULL) return (NULL); bcopy(orig, sk, sizeof(struct pf_state_key_cmp)); return (sk); } int pf_state_insert(struct pfi_kkif *kif, struct pfi_kkif *orig_kif, struct pf_state_key *skw, struct pf_state_key *sks, struct pf_kstate *s) { struct pf_idhash *ih; struct pf_kstate *cur; int error; KASSERT(TAILQ_EMPTY(&sks->states[0]) && TAILQ_EMPTY(&sks->states[1]), ("%s: sks not pristine", __func__)); KASSERT(TAILQ_EMPTY(&skw->states[0]) && TAILQ_EMPTY(&skw->states[1]), ("%s: skw not pristine", __func__)); KASSERT(s->refs == 0, ("%s: state not pristine", __func__)); s->kif = kif; s->orig_kif = orig_kif; if (s->id == 0 && s->creatorid == 0) { s->id = alloc_unr64(&V_pf_stateid); s->id = htobe64(s->id); s->creatorid = V_pf_status.hostid; } /* Returns with ID locked on success. */ if ((error = pf_state_key_attach(skw, sks, s)) != 0) return (error); ih = &V_pf_idhash[PF_IDHASH(s)]; PF_HASHROW_ASSERT(ih); LIST_FOREACH(cur, &ih->states, entry) if (cur->id == s->id && cur->creatorid == s->creatorid) break; if (cur != NULL) { PF_HASHROW_UNLOCK(ih); if (V_pf_status.debug >= PF_DEBUG_MISC) { printf("pf: state ID collision: " "id: %016llx creatorid: %08x\n", (unsigned long long)be64toh(s->id), ntohl(s->creatorid)); } pf_detach_state(s); return (EEXIST); } LIST_INSERT_HEAD(&ih->states, s, entry); /* One for keys, one for ID hash. */ refcount_init(&s->refs, 2); pf_counter_u64_add(&V_pf_status.fcounters[FCNT_STATE_INSERT], 1); if (V_pfsync_insert_state_ptr != NULL) V_pfsync_insert_state_ptr(s); /* Returns locked. */ return (0); } /* * Find state by ID: returns with locked row on success. */ struct pf_kstate * pf_find_state_byid(uint64_t id, uint32_t creatorid) { struct pf_idhash *ih; struct pf_kstate *s; pf_counter_u64_add(&V_pf_status.fcounters[FCNT_STATE_SEARCH], 1); ih = &V_pf_idhash[(be64toh(id) % (pf_hashmask + 1))]; PF_HASHROW_LOCK(ih); LIST_FOREACH(s, &ih->states, entry) if (s->id == id && s->creatorid == creatorid) break; if (s == NULL) PF_HASHROW_UNLOCK(ih); return (s); } /* * Find state by key. * Returns with ID hash slot locked on success. */ static struct pf_kstate * pf_find_state(struct pfi_kkif *kif, struct pf_state_key_cmp *key, u_int dir) { struct pf_keyhash *kh; struct pf_state_key *sk; struct pf_kstate *s; int idx; pf_counter_u64_add(&V_pf_status.fcounters[FCNT_STATE_SEARCH], 1); kh = &V_pf_keyhash[pf_hashkey((struct pf_state_key *)key)]; PF_HASHROW_LOCK(kh); LIST_FOREACH(sk, &kh->keys, entry) if (bcmp(sk, key, sizeof(struct pf_state_key_cmp)) == 0) break; if (sk == NULL) { PF_HASHROW_UNLOCK(kh); return (NULL); } idx = (dir == PF_IN ? PF_SK_WIRE : PF_SK_STACK); /* List is sorted, if-bound states before floating ones. */ TAILQ_FOREACH(s, &sk->states[idx], key_list[idx]) if (s->kif == V_pfi_all || s->kif == kif) { PF_STATE_LOCK(s); PF_HASHROW_UNLOCK(kh); if (__predict_false(s->timeout >= PFTM_MAX)) { /* * State is either being processed by * pf_unlink_state() in an other thread, or * is scheduled for immediate expiry. */ PF_STATE_UNLOCK(s); return (NULL); } return (s); } PF_HASHROW_UNLOCK(kh); return (NULL); } /* * Returns with ID hash slot locked on success. */ struct pf_kstate * pf_find_state_all(struct pf_state_key_cmp *key, u_int dir, int *more) { struct pf_keyhash *kh; struct pf_state_key *sk; struct pf_kstate *s, *ret = NULL; int idx, inout = 0; pf_counter_u64_add(&V_pf_status.fcounters[FCNT_STATE_SEARCH], 1); kh = &V_pf_keyhash[pf_hashkey((struct pf_state_key *)key)]; PF_HASHROW_LOCK(kh); LIST_FOREACH(sk, &kh->keys, entry) if (bcmp(sk, key, sizeof(struct pf_state_key_cmp)) == 0) break; if (sk == NULL) { PF_HASHROW_UNLOCK(kh); return (NULL); } switch (dir) { case PF_IN: idx = PF_SK_WIRE; break; case PF_OUT: idx = PF_SK_STACK; break; case PF_INOUT: idx = PF_SK_WIRE; inout = 1; break; default: panic("%s: dir %u", __func__, dir); } second_run: TAILQ_FOREACH(s, &sk->states[idx], key_list[idx]) { if (more == NULL) { PF_STATE_LOCK(s); PF_HASHROW_UNLOCK(kh); return (s); } if (ret) (*more)++; else { ret = s; PF_STATE_LOCK(s); } } if (inout == 1) { inout = 0; idx = PF_SK_STACK; goto second_run; } PF_HASHROW_UNLOCK(kh); return (ret); } /* * FIXME * This routine is inefficient -- locks the state only to unlock immediately on * return. * It is racy -- after the state is unlocked nothing stops other threads from * removing it. */ bool pf_find_state_all_exists(struct pf_state_key_cmp *key, u_int dir) { struct pf_kstate *s; s = pf_find_state_all(key, dir, NULL); if (s != NULL) { PF_STATE_UNLOCK(s); return (true); } return (false); } /* END state table stuff */ static void pf_send(struct pf_send_entry *pfse) { PF_SENDQ_LOCK(); STAILQ_INSERT_TAIL(&V_pf_sendqueue, pfse, pfse_next); PF_SENDQ_UNLOCK(); swi_sched(V_pf_swi_cookie, 0); } static bool pf_isforlocal(struct mbuf *m, int af) { switch (af) { #ifdef INET case AF_INET: { struct ip *ip = mtod(m, struct ip *); return (in_localip(ip->ip_dst)); } #endif #ifdef INET6 case AF_INET6: { struct ip6_hdr *ip6; struct in6_ifaddr *ia; ip6 = mtod(m, struct ip6_hdr *); ia = in6ifa_ifwithaddr(&ip6->ip6_dst, 0 /* XXX */, false); if (ia == NULL) return (false); return (! (ia->ia6_flags & IN6_IFF_NOTREADY)); } #endif default: panic("Unsupported af %d", af); } return (false); } void pf_intr(void *v) { struct epoch_tracker et; struct pf_send_head queue; struct pf_send_entry *pfse, *next; CURVNET_SET((struct vnet *)v); PF_SENDQ_LOCK(); queue = V_pf_sendqueue; STAILQ_INIT(&V_pf_sendqueue); PF_SENDQ_UNLOCK(); NET_EPOCH_ENTER(et); STAILQ_FOREACH_SAFE(pfse, &queue, pfse_next, next) { switch (pfse->pfse_type) { #ifdef INET case PFSE_IP: { if (pf_isforlocal(pfse->pfse_m, AF_INET)) { pfse->pfse_m->m_flags |= M_SKIP_FIREWALL; pfse->pfse_m->m_pkthdr.csum_flags |= CSUM_IP_VALID | CSUM_IP_CHECKED; ip_input(pfse->pfse_m); } else { ip_output(pfse->pfse_m, NULL, NULL, 0, NULL, NULL); } break; } case PFSE_ICMP: icmp_error(pfse->pfse_m, pfse->icmpopts.type, pfse->icmpopts.code, 0, pfse->icmpopts.mtu); break; #endif /* INET */ #ifdef INET6 case PFSE_IP6: if (pf_isforlocal(pfse->pfse_m, AF_INET6)) { pfse->pfse_m->m_flags |= M_SKIP_FIREWALL; ip6_input(pfse->pfse_m); } else { ip6_output(pfse->pfse_m, NULL, NULL, 0, NULL, NULL, NULL); } break; case PFSE_ICMP6: icmp6_error(pfse->pfse_m, pfse->icmpopts.type, pfse->icmpopts.code, pfse->icmpopts.mtu); break; #endif /* INET6 */ default: panic("%s: unknown type", __func__); } free(pfse, M_PFTEMP); } NET_EPOCH_EXIT(et); CURVNET_RESTORE(); } #define pf_purge_thread_period (hz / 10) #ifdef PF_WANT_32_TO_64_COUNTER static void pf_status_counter_u64_periodic(void) { PF_RULES_RASSERT(); if ((V_pf_counter_periodic_iter % (pf_purge_thread_period * 10 * 60)) != 0) { return; } for (int i = 0; i < FCNT_MAX; i++) { pf_counter_u64_periodic(&V_pf_status.fcounters[i]); } } static void pf_kif_counter_u64_periodic(void) { struct pfi_kkif *kif; size_t r, run; PF_RULES_RASSERT(); if (__predict_false(V_pf_allkifcount == 0)) { return; } if ((V_pf_counter_periodic_iter % (pf_purge_thread_period * 10 * 300)) != 0) { return; } run = V_pf_allkifcount / 10; if (run < 5) run = 5; for (r = 0; r < run; r++) { kif = LIST_NEXT(V_pf_kifmarker, pfik_allkiflist); if (kif == NULL) { LIST_REMOVE(V_pf_kifmarker, pfik_allkiflist); LIST_INSERT_HEAD(&V_pf_allkiflist, V_pf_kifmarker, pfik_allkiflist); break; } LIST_REMOVE(V_pf_kifmarker, pfik_allkiflist); LIST_INSERT_AFTER(kif, V_pf_kifmarker, pfik_allkiflist); for (int i = 0; i < 2; i++) { for (int j = 0; j < 2; j++) { for (int k = 0; k < 2; k++) { pf_counter_u64_periodic(&kif->pfik_packets[i][j][k]); pf_counter_u64_periodic(&kif->pfik_bytes[i][j][k]); } } } } } static void pf_rule_counter_u64_periodic(void) { struct pf_krule *rule; size_t r, run; PF_RULES_RASSERT(); if (__predict_false(V_pf_allrulecount == 0)) { return; } if ((V_pf_counter_periodic_iter % (pf_purge_thread_period * 10 * 300)) != 0) { return; } run = V_pf_allrulecount / 10; if (run < 5) run = 5; for (r = 0; r < run; r++) { rule = LIST_NEXT(V_pf_rulemarker, allrulelist); if (rule == NULL) { LIST_REMOVE(V_pf_rulemarker, allrulelist); LIST_INSERT_HEAD(&V_pf_allrulelist, V_pf_rulemarker, allrulelist); break; } LIST_REMOVE(V_pf_rulemarker, allrulelist); LIST_INSERT_AFTER(rule, V_pf_rulemarker, allrulelist); pf_counter_u64_periodic(&rule->evaluations); for (int i = 0; i < 2; i++) { pf_counter_u64_periodic(&rule->packets[i]); pf_counter_u64_periodic(&rule->bytes[i]); } } } static void pf_counter_u64_periodic_main(void) { PF_RULES_RLOCK_TRACKER; V_pf_counter_periodic_iter++; PF_RULES_RLOCK(); pf_counter_u64_critical_enter(); pf_status_counter_u64_periodic(); pf_kif_counter_u64_periodic(); pf_rule_counter_u64_periodic(); pf_counter_u64_critical_exit(); PF_RULES_RUNLOCK(); } #else #define pf_counter_u64_periodic_main() do { } while (0) #endif void pf_purge_thread(void *unused __unused) { VNET_ITERATOR_DECL(vnet_iter); sx_xlock(&pf_end_lock); while (pf_end_threads == 0) { sx_sleep(pf_purge_thread, &pf_end_lock, 0, "pftm", pf_purge_thread_period); VNET_LIST_RLOCK(); VNET_FOREACH(vnet_iter) { CURVNET_SET(vnet_iter); /* Wait until V_pf_default_rule is initialized. */ if (V_pf_vnet_active == 0) { CURVNET_RESTORE(); continue; } pf_counter_u64_periodic_main(); /* * Process 1/interval fraction of the state * table every run. */ V_pf_purge_idx = pf_purge_expired_states(V_pf_purge_idx, pf_hashmask / (V_pf_default_rule.timeout[PFTM_INTERVAL] * 10)); /* * Purge other expired types every * PFTM_INTERVAL seconds. */ if (V_pf_purge_idx == 0) { /* * Order is important: * - states and src nodes reference rules * - states and rules reference kifs */ pf_purge_expired_fragments(); pf_purge_expired_src_nodes(); pf_purge_unlinked_rules(); pfi_kkif_purge(); } CURVNET_RESTORE(); } VNET_LIST_RUNLOCK(); } pf_end_threads++; sx_xunlock(&pf_end_lock); kproc_exit(0); } void pf_unload_vnet_purge(void) { /* * To cleanse up all kifs and rules we need * two runs: first one clears reference flags, * then pf_purge_expired_states() doesn't * raise them, and then second run frees. */ pf_purge_unlinked_rules(); pfi_kkif_purge(); /* * Now purge everything. */ pf_purge_expired_states(0, pf_hashmask); pf_purge_fragments(UINT_MAX); pf_purge_expired_src_nodes(); /* * Now all kifs & rules should be unreferenced, * thus should be successfully freed. */ pf_purge_unlinked_rules(); pfi_kkif_purge(); } u_int32_t pf_state_expires(const struct pf_kstate *state) { u_int32_t timeout; u_int32_t start; u_int32_t end; u_int32_t states; /* handle all PFTM_* > PFTM_MAX here */ if (state->timeout == PFTM_PURGE) return (time_uptime); KASSERT(state->timeout != PFTM_UNLINKED, ("pf_state_expires: timeout == PFTM_UNLINKED")); KASSERT((state->timeout < PFTM_MAX), ("pf_state_expires: timeout > PFTM_MAX")); timeout = state->rule.ptr->timeout[state->timeout]; if (!timeout) timeout = V_pf_default_rule.timeout[state->timeout]; start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START]; if (start && state->rule.ptr != &V_pf_default_rule) { end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END]; states = counter_u64_fetch(state->rule.ptr->states_cur); } else { start = V_pf_default_rule.timeout[PFTM_ADAPTIVE_START]; end = V_pf_default_rule.timeout[PFTM_ADAPTIVE_END]; states = V_pf_status.states; } if (end && states > start && start < end) { if (states < end) { timeout = (u_int64_t)timeout * (end - states) / (end - start); return (state->expire + timeout); } else return (time_uptime); } return (state->expire + timeout); } void pf_purge_expired_src_nodes(void) { struct pf_ksrc_node_list freelist; struct pf_srchash *sh; struct pf_ksrc_node *cur, *next; int i; LIST_INIT(&freelist); for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++) { PF_HASHROW_LOCK(sh); LIST_FOREACH_SAFE(cur, &sh->nodes, entry, next) if (cur->states == 0 && cur->expire <= time_uptime) { pf_unlink_src_node(cur); LIST_INSERT_HEAD(&freelist, cur, entry); } else if (cur->rule.ptr != NULL) cur->rule.ptr->rule_ref |= PFRULE_REFS; PF_HASHROW_UNLOCK(sh); } pf_free_src_nodes(&freelist); V_pf_status.src_nodes = uma_zone_get_cur(V_pf_sources_z); } static void pf_src_tree_remove_state(struct pf_kstate *s) { struct pf_ksrc_node *sn; struct pf_srchash *sh; uint32_t timeout; timeout = s->rule.ptr->timeout[PFTM_SRC_NODE] ? s->rule.ptr->timeout[PFTM_SRC_NODE] : V_pf_default_rule.timeout[PFTM_SRC_NODE]; if (s->src_node != NULL) { sn = s->src_node; sh = &V_pf_srchash[pf_hashsrc(&sn->addr, sn->af)]; PF_HASHROW_LOCK(sh); if (s->src.tcp_est) --sn->conn; if (--sn->states == 0) sn->expire = time_uptime + timeout; PF_HASHROW_UNLOCK(sh); } if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) { sn = s->nat_src_node; sh = &V_pf_srchash[pf_hashsrc(&sn->addr, sn->af)]; PF_HASHROW_LOCK(sh); if (--sn->states == 0) sn->expire = time_uptime + timeout; PF_HASHROW_UNLOCK(sh); } s->src_node = s->nat_src_node = NULL; } /* * Unlink and potentilly free a state. Function may be * called with ID hash row locked, but always returns * unlocked, since it needs to go through key hash locking. */ int pf_unlink_state(struct pf_kstate *s) { struct pf_idhash *ih = &V_pf_idhash[PF_IDHASH(s)]; PF_HASHROW_ASSERT(ih); if (s->timeout == PFTM_UNLINKED) { /* * State is being processed * by pf_unlink_state() in * an other thread. */ PF_HASHROW_UNLOCK(ih); return (0); /* XXXGL: undefined actually */ } if (s->src.state == PF_TCPS_PROXY_DST) { /* XXX wire key the right one? */ pf_send_tcp(s->rule.ptr, s->key[PF_SK_WIRE]->af, &s->key[PF_SK_WIRE]->addr[1], &s->key[PF_SK_WIRE]->addr[0], s->key[PF_SK_WIRE]->port[1], s->key[PF_SK_WIRE]->port[0], s->src.seqhi, s->src.seqlo + 1, TH_RST|TH_ACK, 0, 0, 0, 1, s->tag); } LIST_REMOVE(s, entry); pf_src_tree_remove_state(s); if (V_pfsync_delete_state_ptr != NULL) V_pfsync_delete_state_ptr(s); STATE_DEC_COUNTERS(s); s->timeout = PFTM_UNLINKED; /* Ensure we remove it from the list of halfopen states, if needed. */ if (s->key[PF_SK_STACK] != NULL && s->key[PF_SK_STACK]->proto == IPPROTO_TCP) pf_set_protostate(s, PF_PEER_BOTH, TCPS_CLOSED); PF_HASHROW_UNLOCK(ih); pf_detach_state(s); /* pf_state_insert() initialises refs to 2 */ return (pf_release_staten(s, 2)); } struct pf_kstate * pf_alloc_state(int flags) { return (uma_zalloc(V_pf_state_z, flags | M_ZERO)); } void pf_free_state(struct pf_kstate *cur) { KASSERT(cur->refs == 0, ("%s: %p has refs", __func__, cur)); KASSERT(cur->timeout == PFTM_UNLINKED, ("%s: timeout %u", __func__, cur->timeout)); pf_normalize_tcp_cleanup(cur); uma_zfree(V_pf_state_z, cur); pf_counter_u64_add(&V_pf_status.fcounters[FCNT_STATE_REMOVALS], 1); } /* * Called only from pf_purge_thread(), thus serialized. */ static u_int pf_purge_expired_states(u_int i, int maxcheck) { struct pf_idhash *ih; struct pf_kstate *s; V_pf_status.states = uma_zone_get_cur(V_pf_state_z); /* * Go through hash and unlink states that expire now. */ while (maxcheck > 0) { ih = &V_pf_idhash[i]; /* only take the lock if we expect to do work */ if (!LIST_EMPTY(&ih->states)) { relock: PF_HASHROW_LOCK(ih); LIST_FOREACH(s, &ih->states, entry) { if (pf_state_expires(s) <= time_uptime) { V_pf_status.states -= pf_unlink_state(s); goto relock; } s->rule.ptr->rule_ref |= PFRULE_REFS; if (s->nat_rule.ptr != NULL) s->nat_rule.ptr->rule_ref |= PFRULE_REFS; if (s->anchor.ptr != NULL) s->anchor.ptr->rule_ref |= PFRULE_REFS; s->kif->pfik_flags |= PFI_IFLAG_REFS; if (s->rt_kif) s->rt_kif->pfik_flags |= PFI_IFLAG_REFS; } PF_HASHROW_UNLOCK(ih); } /* Return when we hit end of hash. */ if (++i > pf_hashmask) { V_pf_status.states = uma_zone_get_cur(V_pf_state_z); return (0); } maxcheck--; } V_pf_status.states = uma_zone_get_cur(V_pf_state_z); return (i); } static void pf_purge_unlinked_rules(void) { struct pf_krulequeue tmpq; struct pf_krule *r, *r1; /* * If we have overloading task pending, then we'd * better skip purging this time. There is a tiny * probability that overloading task references * an already unlinked rule. */ PF_OVERLOADQ_LOCK(); if (!SLIST_EMPTY(&V_pf_overloadqueue)) { PF_OVERLOADQ_UNLOCK(); return; } PF_OVERLOADQ_UNLOCK(); /* * Do naive mark-and-sweep garbage collecting of old rules. * Reference flag is raised by pf_purge_expired_states() * and pf_purge_expired_src_nodes(). * * To avoid LOR between PF_UNLNKDRULES_LOCK/PF_RULES_WLOCK, * use a temporary queue. */ TAILQ_INIT(&tmpq); PF_UNLNKDRULES_LOCK(); TAILQ_FOREACH_SAFE(r, &V_pf_unlinked_rules, entries, r1) { if (!(r->rule_ref & PFRULE_REFS)) { TAILQ_REMOVE(&V_pf_unlinked_rules, r, entries); TAILQ_INSERT_TAIL(&tmpq, r, entries); } else r->rule_ref &= ~PFRULE_REFS; } PF_UNLNKDRULES_UNLOCK(); if (!TAILQ_EMPTY(&tmpq)) { PF_CONFIG_LOCK(); PF_RULES_WLOCK(); TAILQ_FOREACH_SAFE(r, &tmpq, entries, r1) { TAILQ_REMOVE(&tmpq, r, entries); pf_free_rule(r); } PF_RULES_WUNLOCK(); PF_CONFIG_UNLOCK(); } } void pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af) { switch (af) { #ifdef INET case AF_INET: { u_int32_t a = ntohl(addr->addr32[0]); printf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255, (a>>8)&255, a&255); if (p) { p = ntohs(p); printf(":%u", p); } break; } #endif /* INET */ #ifdef INET6 case AF_INET6: { u_int16_t b; u_int8_t i, curstart, curend, maxstart, maxend; curstart = curend = maxstart = maxend = 255; for (i = 0; i < 8; i++) { if (!addr->addr16[i]) { if (curstart == 255) curstart = i; curend = i; } else { if ((curend - curstart) > (maxend - maxstart)) { maxstart = curstart; maxend = curend; } curstart = curend = 255; } } if ((curend - curstart) > (maxend - maxstart)) { maxstart = curstart; maxend = curend; } for (i = 0; i < 8; i++) { if (i >= maxstart && i <= maxend) { if (i == 0) printf(":"); if (i == maxend) printf(":"); } else { b = ntohs(addr->addr16[i]); printf("%x", b); if (i < 7) printf(":"); } } if (p) { p = ntohs(p); printf("[%u]", p); } break; } #endif /* INET6 */ } } void pf_print_state(struct pf_kstate *s) { pf_print_state_parts(s, NULL, NULL); } static void pf_print_state_parts(struct pf_kstate *s, struct pf_state_key *skwp, struct pf_state_key *sksp) { struct pf_state_key *skw, *sks; u_int8_t proto, dir; /* Do our best to fill these, but they're skipped if NULL */ skw = skwp ? skwp : (s ? s->key[PF_SK_WIRE] : NULL); sks = sksp ? sksp : (s ? s->key[PF_SK_STACK] : NULL); proto = skw ? skw->proto : (sks ? sks->proto : 0); dir = s ? s->direction : 0; switch (proto) { case IPPROTO_IPV4: printf("IPv4"); break; case IPPROTO_IPV6: printf("IPv6"); break; case IPPROTO_TCP: printf("TCP"); break; case IPPROTO_UDP: printf("UDP"); break; case IPPROTO_ICMP: printf("ICMP"); break; case IPPROTO_ICMPV6: printf("ICMPv6"); break; default: printf("%u", proto); break; } switch (dir) { case PF_IN: printf(" in"); break; case PF_OUT: printf(" out"); break; } if (skw) { printf(" wire: "); pf_print_host(&skw->addr[0], skw->port[0], skw->af); printf(" "); pf_print_host(&skw->addr[1], skw->port[1], skw->af); } if (sks) { printf(" stack: "); if (sks != skw) { pf_print_host(&sks->addr[0], sks->port[0], sks->af); printf(" "); pf_print_host(&sks->addr[1], sks->port[1], sks->af); } else printf("-"); } if (s) { if (proto == IPPROTO_TCP) { printf(" [lo=%u high=%u win=%u modulator=%u", s->src.seqlo, s->src.seqhi, s->src.max_win, s->src.seqdiff); if (s->src.wscale && s->dst.wscale) printf(" wscale=%u", s->src.wscale & PF_WSCALE_MASK); printf("]"); printf(" [lo=%u high=%u win=%u modulator=%u", s->dst.seqlo, s->dst.seqhi, s->dst.max_win, s->dst.seqdiff); if (s->src.wscale && s->dst.wscale) printf(" wscale=%u", s->dst.wscale & PF_WSCALE_MASK); printf("]"); } printf(" %u:%u", s->src.state, s->dst.state); } } void pf_print_flags(u_int8_t f) { if (f) printf(" "); if (f & TH_FIN) printf("F"); if (f & TH_SYN) printf("S"); if (f & TH_RST) printf("R"); if (f & TH_PUSH) printf("P"); if (f & TH_ACK) printf("A"); if (f & TH_URG) printf("U"); if (f & TH_ECE) printf("E"); if (f & TH_CWR) printf("W"); } #define PF_SET_SKIP_STEPS(i) \ do { \ while (head[i] != cur) { \ head[i]->skip[i].ptr = cur; \ head[i] = TAILQ_NEXT(head[i], entries); \ } \ } while (0) void pf_calc_skip_steps(struct pf_krulequeue *rules) { struct pf_krule *cur, *prev, *head[PF_SKIP_COUNT]; int i; cur = TAILQ_FIRST(rules); prev = cur; for (i = 0; i < PF_SKIP_COUNT; ++i) head[i] = cur; while (cur != NULL) { if (cur->kif != prev->kif || cur->ifnot != prev->ifnot) PF_SET_SKIP_STEPS(PF_SKIP_IFP); if (cur->direction != prev->direction) PF_SET_SKIP_STEPS(PF_SKIP_DIR); if (cur->af != prev->af) PF_SET_SKIP_STEPS(PF_SKIP_AF); if (cur->proto != prev->proto) PF_SET_SKIP_STEPS(PF_SKIP_PROTO); if (cur->src.neg != prev->src.neg || pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr)) PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR); if (cur->src.port[0] != prev->src.port[0] || cur->src.port[1] != prev->src.port[1] || cur->src.port_op != prev->src.port_op) PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT); if (cur->dst.neg != prev->dst.neg || pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr)) PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR); if (cur->dst.port[0] != prev->dst.port[0] || cur->dst.port[1] != prev->dst.port[1] || cur->dst.port_op != prev->dst.port_op) PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT); prev = cur; cur = TAILQ_NEXT(cur, entries); } for (i = 0; i < PF_SKIP_COUNT; ++i) PF_SET_SKIP_STEPS(i); } static int pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2) { if (aw1->type != aw2->type) return (1); switch (aw1->type) { case PF_ADDR_ADDRMASK: case PF_ADDR_RANGE: if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, AF_INET6)) return (1); if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, AF_INET6)) return (1); return (0); case PF_ADDR_DYNIFTL: return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt); case PF_ADDR_NOROUTE: case PF_ADDR_URPFFAILED: return (0); case PF_ADDR_TABLE: return (aw1->p.tbl != aw2->p.tbl); default: printf("invalid address type: %d\n", aw1->type); return (1); } } /** * Checksum updates are a little complicated because the checksum in the TCP/UDP * header isn't always a full checksum. In some cases (i.e. output) it's a * pseudo-header checksum, which is a partial checksum over src/dst IP * addresses, protocol number and length. * * That means we have the following cases: * * Input or forwarding: we don't have TSO, the checksum fields are full * checksums, we need to update the checksum whenever we change anything. * * Output (i.e. the checksum is a pseudo-header checksum): * x The field being updated is src/dst address or affects the length of * the packet. We need to update the pseudo-header checksum (note that this * checksum is not ones' complement). * x Some other field is being modified (e.g. src/dst port numbers): We * don't have to update anything. **/ u_int16_t pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp) { u_int32_t x; x = cksum + old - new; x = (x + (x >> 16)) & 0xffff; /* optimise: eliminate a branch when not udp */ if (udp && cksum == 0x0000) return cksum; if (udp && x == 0x0000) x = 0xffff; return (u_int16_t)(x); } static void pf_patch_8(struct mbuf *m, u_int16_t *cksum, u_int8_t *f, u_int8_t v, bool hi, u_int8_t udp) { u_int16_t old = htons(hi ? (*f << 8) : *f); u_int16_t new = htons(hi ? ( v << 8) : v); if (*f == v) return; *f = v; if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | CSUM_DELAY_DATA_IPV6)) return; *cksum = pf_cksum_fixup(*cksum, old, new, udp); } void pf_patch_16_unaligned(struct mbuf *m, u_int16_t *cksum, void *f, u_int16_t v, bool hi, u_int8_t udp) { u_int8_t *fb = (u_int8_t *)f; u_int8_t *vb = (u_int8_t *)&v; pf_patch_8(m, cksum, fb++, *vb++, hi, udp); pf_patch_8(m, cksum, fb++, *vb++, !hi, udp); } void pf_patch_32_unaligned(struct mbuf *m, u_int16_t *cksum, void *f, u_int32_t v, bool hi, u_int8_t udp) { u_int8_t *fb = (u_int8_t *)f; u_int8_t *vb = (u_int8_t *)&v; pf_patch_8(m, cksum, fb++, *vb++, hi, udp); pf_patch_8(m, cksum, fb++, *vb++, !hi, udp); pf_patch_8(m, cksum, fb++, *vb++, hi, udp); pf_patch_8(m, cksum, fb++, *vb++, !hi, udp); } u_int16_t pf_proto_cksum_fixup(struct mbuf *m, u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp) { if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | CSUM_DELAY_DATA_IPV6)) return (cksum); return (pf_cksum_fixup(cksum, old, new, udp)); } static void pf_change_ap(struct mbuf *m, struct pf_addr *a, u_int16_t *p, u_int16_t *ic, u_int16_t *pc, struct pf_addr *an, u_int16_t pn, u_int8_t u, sa_family_t af) { struct pf_addr ao; u_int16_t po = *p; PF_ACPY(&ao, a, af); PF_ACPY(a, an, af); if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | CSUM_DELAY_DATA_IPV6)) *pc = ~*pc; *p = pn; switch (af) { #ifdef INET case AF_INET: *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, ao.addr16[0], an->addr16[0], 0), ao.addr16[1], an->addr16[1], 0); *p = pn; *pc = pf_cksum_fixup(pf_cksum_fixup(*pc, ao.addr16[0], an->addr16[0], u), ao.addr16[1], an->addr16[1], u); *pc = pf_proto_cksum_fixup(m, *pc, po, pn, u); break; #endif /* INET */ #ifdef INET6 case AF_INET6: *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( pf_cksum_fixup(pf_cksum_fixup(*pc, ao.addr16[0], an->addr16[0], u), ao.addr16[1], an->addr16[1], u), ao.addr16[2], an->addr16[2], u), ao.addr16[3], an->addr16[3], u), ao.addr16[4], an->addr16[4], u), ao.addr16[5], an->addr16[5], u), ao.addr16[6], an->addr16[6], u), ao.addr16[7], an->addr16[7], u); *pc = pf_proto_cksum_fixup(m, *pc, po, pn, u); break; #endif /* INET6 */ } if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | CSUM_DELAY_DATA_IPV6)) { *pc = ~*pc; if (! *pc) *pc = 0xffff; } } /* Changes a u_int32_t. Uses a void * so there are no align restrictions */ void pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u) { u_int32_t ao; memcpy(&ao, a, sizeof(ao)); memcpy(a, &an, sizeof(u_int32_t)); *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u), ao % 65536, an % 65536, u); } void pf_change_proto_a(struct mbuf *m, void *a, u_int16_t *c, u_int32_t an, u_int8_t udp) { u_int32_t ao; memcpy(&ao, a, sizeof(ao)); memcpy(a, &an, sizeof(u_int32_t)); *c = pf_proto_cksum_fixup(m, pf_proto_cksum_fixup(m, *c, ao / 65536, an / 65536, udp), ao % 65536, an % 65536, udp); } #ifdef INET6 static void pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u) { struct pf_addr ao; PF_ACPY(&ao, a, AF_INET6); PF_ACPY(a, an, AF_INET6); *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( pf_cksum_fixup(pf_cksum_fixup(*c, ao.addr16[0], an->addr16[0], u), ao.addr16[1], an->addr16[1], u), ao.addr16[2], an->addr16[2], u), ao.addr16[3], an->addr16[3], u), ao.addr16[4], an->addr16[4], u), ao.addr16[5], an->addr16[5], u), ao.addr16[6], an->addr16[6], u), ao.addr16[7], an->addr16[7], u); } #endif /* INET6 */ static void pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa, struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c, u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af) { struct pf_addr oia, ooa; PF_ACPY(&oia, ia, af); if (oa) PF_ACPY(&ooa, oa, af); /* Change inner protocol port, fix inner protocol checksum. */ if (ip != NULL) { u_int16_t oip = *ip; u_int32_t opc; if (pc != NULL) opc = *pc; *ip = np; if (pc != NULL) *pc = pf_cksum_fixup(*pc, oip, *ip, u); *ic = pf_cksum_fixup(*ic, oip, *ip, 0); if (pc != NULL) *ic = pf_cksum_fixup(*ic, opc, *pc, 0); } /* Change inner ip address, fix inner ip and icmp checksums. */ PF_ACPY(ia, na, af); switch (af) { #ifdef INET case AF_INET: { u_int32_t oh2c = *h2c; *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c, oia.addr16[0], ia->addr16[0], 0), oia.addr16[1], ia->addr16[1], 0); *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, oia.addr16[0], ia->addr16[0], 0), oia.addr16[1], ia->addr16[1], 0); *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0); break; } #endif /* INET */ #ifdef INET6 case AF_INET6: *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( pf_cksum_fixup(pf_cksum_fixup(*ic, oia.addr16[0], ia->addr16[0], u), oia.addr16[1], ia->addr16[1], u), oia.addr16[2], ia->addr16[2], u), oia.addr16[3], ia->addr16[3], u), oia.addr16[4], ia->addr16[4], u), oia.addr16[5], ia->addr16[5], u), oia.addr16[6], ia->addr16[6], u), oia.addr16[7], ia->addr16[7], u); break; #endif /* INET6 */ } /* Outer ip address, fix outer ip or icmpv6 checksum, if necessary. */ if (oa) { PF_ACPY(oa, na, af); switch (af) { #ifdef INET case AF_INET: *hc = pf_cksum_fixup(pf_cksum_fixup(*hc, ooa.addr16[0], oa->addr16[0], 0), ooa.addr16[1], oa->addr16[1], 0); break; #endif /* INET */ #ifdef INET6 case AF_INET6: *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( pf_cksum_fixup(pf_cksum_fixup(*ic, ooa.addr16[0], oa->addr16[0], u), ooa.addr16[1], oa->addr16[1], u), ooa.addr16[2], oa->addr16[2], u), ooa.addr16[3], oa->addr16[3], u), ooa.addr16[4], oa->addr16[4], u), ooa.addr16[5], oa->addr16[5], u), ooa.addr16[6], oa->addr16[6], u), ooa.addr16[7], oa->addr16[7], u); break; #endif /* INET6 */ } } } /* * Need to modulate the sequence numbers in the TCP SACK option * (credits to Krzysztof Pfaff for report and patch) */ static int pf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd, struct tcphdr *th, struct pf_state_peer *dst) { int hlen = (th->th_off << 2) - sizeof(*th), thoptlen = hlen; u_int8_t opts[TCP_MAXOLEN], *opt = opts; int copyback = 0, i, olen; struct sackblk sack; #define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2) if (hlen < TCPOLEN_SACKLEN || !pf_pull_hdr(m, off + sizeof(*th), opts, hlen, NULL, NULL, pd->af)) return 0; while (hlen >= TCPOLEN_SACKLEN) { size_t startoff = opt - opts; olen = opt[1]; switch (*opt) { case TCPOPT_EOL: /* FALLTHROUGH */ case TCPOPT_NOP: opt++; hlen--; break; case TCPOPT_SACK: if (olen > hlen) olen = hlen; if (olen >= TCPOLEN_SACKLEN) { for (i = 2; i + TCPOLEN_SACK <= olen; i += TCPOLEN_SACK) { memcpy(&sack, &opt[i], sizeof(sack)); pf_patch_32_unaligned(m, &th->th_sum, &sack.start, htonl(ntohl(sack.start) - dst->seqdiff), PF_ALGNMNT(startoff), 0); pf_patch_32_unaligned(m, &th->th_sum, &sack.end, htonl(ntohl(sack.end) - dst->seqdiff), PF_ALGNMNT(startoff), 0); memcpy(&opt[i], &sack, sizeof(sack)); } copyback = 1; } /* FALLTHROUGH */ default: if (olen < 2) olen = 2; hlen -= olen; opt += olen; } } if (copyback) m_copyback(m, off + sizeof(*th), thoptlen, (caddr_t)opts); return (copyback); } struct mbuf * pf_build_tcp(const struct pf_krule *r, sa_family_t af, const struct pf_addr *saddr, const struct pf_addr *daddr, u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack, u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag, u_int16_t rtag) { struct mbuf *m; int len, tlen; #ifdef INET struct ip *h = NULL; #endif /* INET */ #ifdef INET6 struct ip6_hdr *h6 = NULL; #endif /* INET6 */ struct tcphdr *th; char *opt; struct pf_mtag *pf_mtag; len = 0; th = NULL; /* maximum segment size tcp option */ tlen = sizeof(struct tcphdr); if (mss) tlen += 4; switch (af) { #ifdef INET case AF_INET: len = sizeof(struct ip) + tlen; break; #endif /* INET */ #ifdef INET6 case AF_INET6: len = sizeof(struct ip6_hdr) + tlen; break; #endif /* INET6 */ default: panic("%s: unsupported af %d", __func__, af); } m = m_gethdr(M_NOWAIT, MT_DATA); if (m == NULL) return (NULL); #ifdef MAC mac_netinet_firewall_send(m); #endif if ((pf_mtag = pf_get_mtag(m)) == NULL) { m_freem(m); return (NULL); } if (tag) m->m_flags |= M_SKIP_FIREWALL; pf_mtag->tag = rtag; if (r != NULL && r->rtableid >= 0) M_SETFIB(m, r->rtableid); #ifdef ALTQ if (r != NULL && r->qid) { pf_mtag->qid = r->qid; /* add hints for ecn */ pf_mtag->hdr = mtod(m, struct ip *); } #endif /* ALTQ */ m->m_data += max_linkhdr; m->m_pkthdr.len = m->m_len = len; /* The rest of the stack assumes a rcvif, so provide one. * This is a locally generated packet, so .. close enough. */ m->m_pkthdr.rcvif = V_loif; bzero(m->m_data, len); switch (af) { #ifdef INET case AF_INET: h = mtod(m, struct ip *); /* IP header fields included in the TCP checksum */ h->ip_p = IPPROTO_TCP; h->ip_len = htons(tlen); h->ip_src.s_addr = saddr->v4.s_addr; h->ip_dst.s_addr = daddr->v4.s_addr; th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip)); break; #endif /* INET */ #ifdef INET6 case AF_INET6: h6 = mtod(m, struct ip6_hdr *); /* IP header fields included in the TCP checksum */ h6->ip6_nxt = IPPROTO_TCP; h6->ip6_plen = htons(tlen); memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr)); memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr)); th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr)); break; #endif /* INET6 */ } /* TCP header */ th->th_sport = sport; th->th_dport = dport; th->th_seq = htonl(seq); th->th_ack = htonl(ack); th->th_off = tlen >> 2; th->th_flags = flags; th->th_win = htons(win); if (mss) { opt = (char *)(th + 1); opt[0] = TCPOPT_MAXSEG; opt[1] = 4; HTONS(mss); bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2); } switch (af) { #ifdef INET case AF_INET: /* TCP checksum */ th->th_sum = in_cksum(m, len); /* Finish the IP header */ h->ip_v = 4; h->ip_hl = sizeof(*h) >> 2; h->ip_tos = IPTOS_LOWDELAY; h->ip_off = htons(V_path_mtu_discovery ? IP_DF : 0); h->ip_len = htons(len); h->ip_ttl = ttl ? ttl : V_ip_defttl; h->ip_sum = 0; break; #endif /* INET */ #ifdef INET6 case AF_INET6: /* TCP checksum */ th->th_sum = in6_cksum(m, IPPROTO_TCP, sizeof(struct ip6_hdr), tlen); h6->ip6_vfc |= IPV6_VERSION; h6->ip6_hlim = IPV6_DEFHLIM; break; #endif /* INET6 */ } return (m); } void pf_send_tcp(const struct pf_krule *r, sa_family_t af, const struct pf_addr *saddr, const struct pf_addr *daddr, u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack, u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag, u_int16_t rtag) { struct pf_send_entry *pfse; struct mbuf *m; m = pf_build_tcp(r, af, saddr, daddr, sport, dport, seq, ack, flags, win, mss, ttl, tag, rtag); if (m == NULL) return; /* Allocate outgoing queue entry, mbuf and mbuf tag. */ pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT); if (pfse == NULL) { m_freem(m); return; } switch (af) { #ifdef INET case AF_INET: pfse->pfse_type = PFSE_IP; break; #endif /* INET */ #ifdef INET6 case AF_INET6: pfse->pfse_type = PFSE_IP6; break; #endif /* INET6 */ } pfse->pfse_m = m; pf_send(pfse); } static void pf_return(struct pf_krule *r, struct pf_krule *nr, struct pf_pdesc *pd, struct pf_state_key *sk, int off, struct mbuf *m, struct tcphdr *th, struct pfi_kkif *kif, u_int16_t bproto_sum, u_int16_t bip_sum, int hdrlen, u_short *reason) { struct pf_addr * const saddr = pd->src; struct pf_addr * const daddr = pd->dst; sa_family_t af = pd->af; /* undo NAT changes, if they have taken place */ if (nr != NULL) { PF_ACPY(saddr, &sk->addr[pd->sidx], af); PF_ACPY(daddr, &sk->addr[pd->didx], af); if (pd->sport) *pd->sport = sk->port[pd->sidx]; if (pd->dport) *pd->dport = sk->port[pd->didx]; if (pd->proto_sum) *pd->proto_sum = bproto_sum; if (pd->ip_sum) *pd->ip_sum = bip_sum; m_copyback(m, off, hdrlen, pd->hdr.any); } if (pd->proto == IPPROTO_TCP && ((r->rule_flag & PFRULE_RETURNRST) || (r->rule_flag & PFRULE_RETURN)) && !(th->th_flags & TH_RST)) { u_int32_t ack = ntohl(th->th_seq) + pd->p_len; int len = 0; #ifdef INET struct ip *h4; #endif #ifdef INET6 struct ip6_hdr *h6; #endif switch (af) { #ifdef INET case AF_INET: h4 = mtod(m, struct ip *); len = ntohs(h4->ip_len) - off; break; #endif #ifdef INET6 case AF_INET6: h6 = mtod(m, struct ip6_hdr *); len = ntohs(h6->ip6_plen) - (off - sizeof(*h6)); break; #endif } if (pf_check_proto_cksum(m, off, len, IPPROTO_TCP, af)) REASON_SET(reason, PFRES_PROTCKSUM); else { if (th->th_flags & TH_SYN) ack++; if (th->th_flags & TH_FIN) ack++; pf_send_tcp(r, af, pd->dst, pd->src, th->th_dport, th->th_sport, ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0, r->return_ttl, 1, 0); } } else if (pd->proto != IPPROTO_ICMP && af == AF_INET && r->return_icmp) pf_send_icmp(m, r->return_icmp >> 8, r->return_icmp & 255, af, r); else if (pd->proto != IPPROTO_ICMPV6 && af == AF_INET6 && r->return_icmp6) pf_send_icmp(m, r->return_icmp6 >> 8, r->return_icmp6 & 255, af, r); } static int pf_match_ieee8021q_pcp(u_int8_t prio, struct mbuf *m) { struct m_tag *mtag; u_int8_t mpcp; mtag = m_tag_locate(m, MTAG_8021Q, MTAG_8021Q_PCP_IN, NULL); if (mtag == NULL) return (0); if (prio == PF_PRIO_ZERO) prio = 0; mpcp = *(uint8_t *)(mtag + 1); return (mpcp == prio); } +static int +pf_icmp_to_bandlim(uint8_t type) +{ + switch (type) { + case ICMP_ECHO: + case ICMP_ECHOREPLY: + return (BANDLIM_ICMP_ECHO); + case ICMP_TSTAMP: + case ICMP_TSTAMPREPLY: + return (BANDLIM_ICMP_TSTAMP); + case ICMP_UNREACH: + default: + return (BANDLIM_ICMP_UNREACH); + } +} + static void pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af, struct pf_krule *r) { struct pf_send_entry *pfse; struct mbuf *m0; struct pf_mtag *pf_mtag; + /* ICMP packet rate limitation. */ + if (af == AF_INET6) { + if (icmp6_ratelimit(NULL, type, code)) + return; + } else { + MPASS(af == AF_INET); + if (badport_bandlim(pf_icmp_to_bandlim(type)) != 0) + return; + } + /* Allocate outgoing queue entry, mbuf and mbuf tag. */ pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT); if (pfse == NULL) return; if ((m0 = m_copypacket(m, M_NOWAIT)) == NULL) { free(pfse, M_PFTEMP); return; } if ((pf_mtag = pf_get_mtag(m0)) == NULL) { free(pfse, M_PFTEMP); return; } /* XXX: revisit */ m0->m_flags |= M_SKIP_FIREWALL; if (r->rtableid >= 0) M_SETFIB(m0, r->rtableid); #ifdef ALTQ if (r->qid) { pf_mtag->qid = r->qid; /* add hints for ecn */ pf_mtag->hdr = mtod(m0, struct ip *); } #endif /* ALTQ */ switch (af) { #ifdef INET case AF_INET: pfse->pfse_type = PFSE_ICMP; break; #endif /* INET */ #ifdef INET6 case AF_INET6: pfse->pfse_type = PFSE_ICMP6; break; #endif /* INET6 */ } pfse->pfse_m = m0; pfse->icmpopts.type = type; pfse->icmpopts.code = code; pf_send(pfse); } /* * Return 1 if the addresses a and b match (with mask m), otherwise return 0. * If n is 0, they match if they are equal. If n is != 0, they match if they * are different. */ int pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m, struct pf_addr *b, sa_family_t af) { int match = 0; switch (af) { #ifdef INET case AF_INET: if ((a->addr32[0] & m->addr32[0]) == (b->addr32[0] & m->addr32[0])) match++; break; #endif /* INET */ #ifdef INET6 case AF_INET6: if (((a->addr32[0] & m->addr32[0]) == (b->addr32[0] & m->addr32[0])) && ((a->addr32[1] & m->addr32[1]) == (b->addr32[1] & m->addr32[1])) && ((a->addr32[2] & m->addr32[2]) == (b->addr32[2] & m->addr32[2])) && ((a->addr32[3] & m->addr32[3]) == (b->addr32[3] & m->addr32[3]))) match++; break; #endif /* INET6 */ } if (match) { if (n) return (0); else return (1); } else { if (n) return (1); else return (0); } } /* * Return 1 if b <= a <= e, otherwise return 0. */ int pf_match_addr_range(struct pf_addr *b, struct pf_addr *e, struct pf_addr *a, sa_family_t af) { switch (af) { #ifdef INET case AF_INET: if ((ntohl(a->addr32[0]) < ntohl(b->addr32[0])) || (ntohl(a->addr32[0]) > ntohl(e->addr32[0]))) return (0); break; #endif /* INET */ #ifdef INET6 case AF_INET6: { int i; /* check a >= b */ for (i = 0; i < 4; ++i) if (ntohl(a->addr32[i]) > ntohl(b->addr32[i])) break; else if (ntohl(a->addr32[i]) < ntohl(b->addr32[i])) return (0); /* check a <= e */ for (i = 0; i < 4; ++i) if (ntohl(a->addr32[i]) < ntohl(e->addr32[i])) break; else if (ntohl(a->addr32[i]) > ntohl(e->addr32[i])) return (0); break; } #endif /* INET6 */ } return (1); } static int pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p) { switch (op) { case PF_OP_IRG: return ((p > a1) && (p < a2)); case PF_OP_XRG: return ((p < a1) || (p > a2)); case PF_OP_RRG: return ((p >= a1) && (p <= a2)); case PF_OP_EQ: return (p == a1); case PF_OP_NE: return (p != a1); case PF_OP_LT: return (p < a1); case PF_OP_LE: return (p <= a1); case PF_OP_GT: return (p > a1); case PF_OP_GE: return (p >= a1); } return (0); /* never reached */ } int pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p) { NTOHS(a1); NTOHS(a2); NTOHS(p); return (pf_match(op, a1, a2, p)); } static int pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u) { if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE) return (0); return (pf_match(op, a1, a2, u)); } static int pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g) { if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE) return (0); return (pf_match(op, a1, a2, g)); } int pf_match_tag(struct mbuf *m, struct pf_krule *r, int *tag, int mtag) { if (*tag == -1) *tag = mtag; return ((!r->match_tag_not && r->match_tag == *tag) || (r->match_tag_not && r->match_tag != *tag)); } int pf_tag_packet(struct mbuf *m, struct pf_pdesc *pd, int tag) { KASSERT(tag > 0, ("%s: tag %d", __func__, tag)); if (pd->pf_mtag == NULL && ((pd->pf_mtag = pf_get_mtag(m)) == NULL)) return (ENOMEM); pd->pf_mtag->tag = tag; return (0); } #define PF_ANCHOR_STACKSIZE 32 struct pf_kanchor_stackframe { struct pf_kruleset *rs; struct pf_krule *r; /* XXX: + match bit */ struct pf_kanchor *child; }; /* * XXX: We rely on malloc(9) returning pointer aligned addresses. */ #define PF_ANCHORSTACK_MATCH 0x00000001 #define PF_ANCHORSTACK_MASK (PF_ANCHORSTACK_MATCH) #define PF_ANCHOR_MATCH(f) ((uintptr_t)(f)->r & PF_ANCHORSTACK_MATCH) #define PF_ANCHOR_RULE(f) (struct pf_krule *) \ ((uintptr_t)(f)->r & ~PF_ANCHORSTACK_MASK) #define PF_ANCHOR_SET_MATCH(f) do { (f)->r = (void *) \ ((uintptr_t)(f)->r | PF_ANCHORSTACK_MATCH); \ } while (0) void pf_step_into_anchor(struct pf_kanchor_stackframe *stack, int *depth, struct pf_kruleset **rs, int n, struct pf_krule **r, struct pf_krule **a, int *match) { struct pf_kanchor_stackframe *f; PF_RULES_RASSERT(); if (match) *match = 0; if (*depth >= PF_ANCHOR_STACKSIZE) { printf("%s: anchor stack overflow on %s\n", __func__, (*r)->anchor->name); *r = TAILQ_NEXT(*r, entries); return; } else if (*depth == 0 && a != NULL) *a = *r; f = stack + (*depth)++; f->rs = *rs; f->r = *r; if ((*r)->anchor_wildcard) { struct pf_kanchor_node *parent = &(*r)->anchor->children; if ((f->child = RB_MIN(pf_kanchor_node, parent)) == NULL) { *r = NULL; return; } *rs = &f->child->ruleset; } else { f->child = NULL; *rs = &(*r)->anchor->ruleset; } *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); } int pf_step_out_of_anchor(struct pf_kanchor_stackframe *stack, int *depth, struct pf_kruleset **rs, int n, struct pf_krule **r, struct pf_krule **a, int *match) { struct pf_kanchor_stackframe *f; struct pf_krule *fr; int quick = 0; PF_RULES_RASSERT(); do { if (*depth <= 0) break; f = stack + *depth - 1; fr = PF_ANCHOR_RULE(f); if (f->child != NULL) { /* * This block traverses through * a wildcard anchor. */ if (match != NULL && *match) { /* * If any of "*" matched, then * "foo/ *" matched, mark frame * appropriately. */ PF_ANCHOR_SET_MATCH(f); *match = 0; } f->child = RB_NEXT(pf_kanchor_node, &fr->anchor->children, f->child); if (f->child != NULL) { *rs = &f->child->ruleset; *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); if (*r == NULL) continue; else break; } } (*depth)--; if (*depth == 0 && a != NULL) *a = NULL; *rs = f->rs; if (PF_ANCHOR_MATCH(f) || (match != NULL && *match)) quick = fr->quick; *r = TAILQ_NEXT(fr, entries); } while (*r == NULL); return (quick); } struct pf_keth_anchor_stackframe { struct pf_keth_ruleset *rs; struct pf_keth_rule *r; /* XXX: + match bit */ struct pf_keth_anchor *child; }; #define PF_ETH_ANCHOR_MATCH(f) ((uintptr_t)(f)->r & PF_ANCHORSTACK_MATCH) #define PF_ETH_ANCHOR_RULE(f) (struct pf_keth_rule *) \ ((uintptr_t)(f)->r & ~PF_ANCHORSTACK_MASK) #define PF_ETH_ANCHOR_SET_MATCH(f) do { (f)->r = (void *) \ ((uintptr_t)(f)->r | PF_ANCHORSTACK_MATCH); \ } while (0) void pf_step_into_keth_anchor(struct pf_keth_anchor_stackframe *stack, int *depth, struct pf_keth_ruleset **rs, struct pf_keth_rule **r, struct pf_keth_rule **a, int *match) { struct pf_keth_anchor_stackframe *f; NET_EPOCH_ASSERT(); if (match) *match = 0; if (*depth >= PF_ANCHOR_STACKSIZE) { printf("%s: anchor stack overflow on %s\n", __func__, (*r)->anchor->name); *r = TAILQ_NEXT(*r, entries); return; } else if (*depth == 0 && a != NULL) *a = *r; f = stack + (*depth)++; f->rs = *rs; f->r = *r; if ((*r)->anchor_wildcard) { struct pf_keth_anchor_node *parent = &(*r)->anchor->children; if ((f->child = RB_MIN(pf_keth_anchor_node, parent)) == NULL) { *r = NULL; return; } *rs = &f->child->ruleset; } else { f->child = NULL; *rs = &(*r)->anchor->ruleset; } *r = TAILQ_FIRST((*rs)->active.rules); } int pf_step_out_of_keth_anchor(struct pf_keth_anchor_stackframe *stack, int *depth, struct pf_keth_ruleset **rs, struct pf_keth_rule **r, struct pf_keth_rule **a, int *match) { struct pf_keth_anchor_stackframe *f; struct pf_keth_rule *fr; int quick = 0; NET_EPOCH_ASSERT(); do { if (*depth <= 0) break; f = stack + *depth - 1; fr = PF_ETH_ANCHOR_RULE(f); if (f->child != NULL) { /* * This block traverses through * a wildcard anchor. */ if (match != NULL && *match) { /* * If any of "*" matched, then * "foo/ *" matched, mark frame * appropriately. */ PF_ETH_ANCHOR_SET_MATCH(f); *match = 0; } f->child = RB_NEXT(pf_keth_anchor_node, &fr->anchor->children, f->child); if (f->child != NULL) { *rs = &f->child->ruleset; *r = TAILQ_FIRST((*rs)->active.rules); if (*r == NULL) continue; else break; } } (*depth)--; if (*depth == 0 && a != NULL) *a = NULL; *rs = f->rs; if (PF_ETH_ANCHOR_MATCH(f) || (match != NULL && *match)) quick = fr->quick; *r = TAILQ_NEXT(fr, entries); } while (*r == NULL); return (quick); } #ifdef INET6 void pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr, struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af) { switch (af) { #ifdef INET case AF_INET: naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); break; #endif /* INET */ case AF_INET6: naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) | ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]); naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) | ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]); naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) | ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]); break; } } void pf_addr_inc(struct pf_addr *addr, sa_family_t af) { switch (af) { #ifdef INET case AF_INET: addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1); break; #endif /* INET */ case AF_INET6: if (addr->addr32[3] == 0xffffffff) { addr->addr32[3] = 0; if (addr->addr32[2] == 0xffffffff) { addr->addr32[2] = 0; if (addr->addr32[1] == 0xffffffff) { addr->addr32[1] = 0; addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1); } else addr->addr32[1] = htonl(ntohl(addr->addr32[1]) + 1); } else addr->addr32[2] = htonl(ntohl(addr->addr32[2]) + 1); } else addr->addr32[3] = htonl(ntohl(addr->addr32[3]) + 1); break; } } #endif /* INET6 */ void pf_rule_to_actions(struct pf_krule *r, struct pf_rule_actions *a) { if (r->qid) a->qid = r->qid; if (r->pqid) a->pqid = r->pqid; if (r->dnpipe) a->dnpipe = r->dnpipe; if (r->dnrpipe) a->dnrpipe = r->dnrpipe; if (r->dnpipe || r->dnrpipe) { if (r->free_flags & PFRULE_DN_IS_PIPE) a->flags |= PFRULE_DN_IS_PIPE; else a->flags &= ~PFRULE_DN_IS_PIPE; } } int pf_socket_lookup(int direction, struct pf_pdesc *pd, struct mbuf *m) { struct pf_addr *saddr, *daddr; u_int16_t sport, dport; struct inpcbinfo *pi; struct inpcb *inp; pd->lookup.uid = UID_MAX; pd->lookup.gid = GID_MAX; switch (pd->proto) { case IPPROTO_TCP: sport = pd->hdr.tcp.th_sport; dport = pd->hdr.tcp.th_dport; pi = &V_tcbinfo; break; case IPPROTO_UDP: sport = pd->hdr.udp.uh_sport; dport = pd->hdr.udp.uh_dport; pi = &V_udbinfo; break; default: return (-1); } if (direction == PF_IN) { saddr = pd->src; daddr = pd->dst; } else { u_int16_t p; p = sport; sport = dport; dport = p; saddr = pd->dst; daddr = pd->src; } switch (pd->af) { #ifdef INET case AF_INET: inp = in_pcblookup_mbuf(pi, saddr->v4, sport, daddr->v4, dport, INPLOOKUP_RLOCKPCB, NULL, m); if (inp == NULL) { inp = in_pcblookup_mbuf(pi, saddr->v4, sport, daddr->v4, dport, INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL, m); if (inp == NULL) return (-1); } break; #endif /* INET */ #ifdef INET6 case AF_INET6: inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport, &daddr->v6, dport, INPLOOKUP_RLOCKPCB, NULL, m); if (inp == NULL) { inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport, &daddr->v6, dport, INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL, m); if (inp == NULL) return (-1); } break; #endif /* INET6 */ default: return (-1); } INP_RLOCK_ASSERT(inp); pd->lookup.uid = inp->inp_cred->cr_uid; pd->lookup.gid = inp->inp_cred->cr_groups[0]; INP_RUNLOCK(inp); return (1); } u_int8_t pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) { int hlen; u_int8_t hdr[60]; u_int8_t *opt, optlen; u_int8_t wscale = 0; hlen = th_off << 2; /* hlen <= sizeof(hdr) */ if (hlen <= sizeof(struct tcphdr)) return (0); if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) return (0); opt = hdr + sizeof(struct tcphdr); hlen -= sizeof(struct tcphdr); while (hlen >= 3) { switch (*opt) { case TCPOPT_EOL: case TCPOPT_NOP: ++opt; --hlen; break; case TCPOPT_WINDOW: wscale = opt[2]; if (wscale > TCP_MAX_WINSHIFT) wscale = TCP_MAX_WINSHIFT; wscale |= PF_WSCALE_FLAG; /* FALLTHROUGH */ default: optlen = opt[1]; if (optlen < 2) optlen = 2; hlen -= optlen; opt += optlen; break; } } return (wscale); } u_int16_t pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) { int hlen; u_int8_t hdr[60]; u_int8_t *opt, optlen; u_int16_t mss = V_tcp_mssdflt; hlen = th_off << 2; /* hlen <= sizeof(hdr) */ if (hlen <= sizeof(struct tcphdr)) return (0); if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) return (0); opt = hdr + sizeof(struct tcphdr); hlen -= sizeof(struct tcphdr); while (hlen >= TCPOLEN_MAXSEG) { switch (*opt) { case TCPOPT_EOL: case TCPOPT_NOP: ++opt; --hlen; break; case TCPOPT_MAXSEG: bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2); NTOHS(mss); /* FALLTHROUGH */ default: optlen = opt[1]; if (optlen < 2) optlen = 2; hlen -= optlen; opt += optlen; break; } } return (mss); } static u_int16_t pf_calc_mss(struct pf_addr *addr, sa_family_t af, int rtableid, u_int16_t offer) { struct nhop_object *nh; #ifdef INET6 struct in6_addr dst6; uint32_t scopeid; #endif /* INET6 */ int hlen = 0; uint16_t mss = 0; NET_EPOCH_ASSERT(); switch (af) { #ifdef INET case AF_INET: hlen = sizeof(struct ip); nh = fib4_lookup(rtableid, addr->v4, 0, 0, 0); if (nh != NULL) mss = nh->nh_mtu - hlen - sizeof(struct tcphdr); break; #endif /* INET */ #ifdef INET6 case AF_INET6: hlen = sizeof(struct ip6_hdr); in6_splitscope(&addr->v6, &dst6, &scopeid); nh = fib6_lookup(rtableid, &dst6, scopeid, 0, 0); if (nh != NULL) mss = nh->nh_mtu - hlen - sizeof(struct tcphdr); break; #endif /* INET6 */ } mss = max(V_tcp_mssdflt, mss); mss = min(mss, offer); mss = max(mss, 64); /* sanity - at least max opt space */ return (mss); } static u_int32_t pf_tcp_iss(struct pf_pdesc *pd) { MD5_CTX ctx; u_int32_t digest[4]; if (V_pf_tcp_secret_init == 0) { arc4random_buf(&V_pf_tcp_secret, sizeof(V_pf_tcp_secret)); MD5Init(&V_pf_tcp_secret_ctx); MD5Update(&V_pf_tcp_secret_ctx, V_pf_tcp_secret, sizeof(V_pf_tcp_secret)); V_pf_tcp_secret_init = 1; } ctx = V_pf_tcp_secret_ctx; MD5Update(&ctx, (char *)&pd->hdr.tcp.th_sport, sizeof(u_short)); MD5Update(&ctx, (char *)&pd->hdr.tcp.th_dport, sizeof(u_short)); if (pd->af == AF_INET6) { MD5Update(&ctx, (char *)&pd->src->v6, sizeof(struct in6_addr)); MD5Update(&ctx, (char *)&pd->dst->v6, sizeof(struct in6_addr)); } else { MD5Update(&ctx, (char *)&pd->src->v4, sizeof(struct in_addr)); MD5Update(&ctx, (char *)&pd->dst->v4, sizeof(struct in_addr)); } MD5Final((u_char *)digest, &ctx); V_pf_tcp_iss_off += 4096; #define ISN_RANDOM_INCREMENT (4096 - 1) return (digest[0] + (arc4random() & ISN_RANDOM_INCREMENT) + V_pf_tcp_iss_off); #undef ISN_RANDOM_INCREMENT } static bool pf_match_eth_addr(const uint8_t *a, const struct pf_keth_rule_addr *r) { bool match = true; /* Always matches if not set */ if (! r->isset) return (!r->neg); for (int i = 0; i < ETHER_ADDR_LEN; i++) { if ((a[i] & r->mask[i]) != (r->addr[i] & r->mask[i])) { match = false; break; } } return (match ^ r->neg); } static int pf_match_eth_tag(struct mbuf *m, struct pf_keth_rule *r, int *tag, int mtag) { if (*tag == -1) *tag = mtag; return ((!r->match_tag_not && r->match_tag == *tag) || (r->match_tag_not && r->match_tag != *tag)); } static int pf_test_eth_rule(int dir, struct pfi_kkif *kif, struct mbuf **m0) { #ifdef INET struct ip ip; #endif #ifdef INET6 struct ip6_hdr ip6; #endif struct mbuf *m = *m0; struct ether_header *e; struct pf_keth_rule *r, *rm, *a = NULL; struct pf_keth_ruleset *ruleset = NULL; struct pf_mtag *mtag; struct pf_keth_ruleq *rules; struct pf_addr *src = NULL, *dst = NULL; sa_family_t af = 0; uint16_t proto; int asd = 0, match = 0; int tag = -1; uint8_t action; struct pf_keth_anchor_stackframe anchor_stack[PF_ANCHOR_STACKSIZE]; MPASS(kif->pfik_ifp->if_vnet == curvnet); NET_EPOCH_ASSERT(); PF_RULES_RLOCK_TRACKER; SDT_PROBE3(pf, eth, test_rule, entry, dir, kif->pfik_ifp, m); mtag = pf_find_mtag(m); if (mtag != NULL && mtag->flags & PF_TAG_DUMMYNET) { /* Dummynet re-injects packets after they've * completed their delay. We've already * processed them, so pass unconditionally. */ /* But only once. We may see the packet multiple times (e.g. * PFIL_IN/PFIL_OUT). */ mtag->flags &= ~PF_TAG_DUMMYNET; return (PF_PASS); } ruleset = V_pf_keth; rules = ck_pr_load_ptr(&ruleset->active.rules); r = TAILQ_FIRST(rules); rm = NULL; e = mtod(m, struct ether_header *); proto = ntohs(e->ether_type); switch (proto) { #ifdef INET case ETHERTYPE_IP: { if (m_length(m, NULL) < (sizeof(struct ether_header) + sizeof(ip))) return (PF_DROP); af = AF_INET; m_copydata(m, sizeof(struct ether_header), sizeof(ip), (caddr_t)&ip); src = (struct pf_addr *)&ip.ip_src; dst = (struct pf_addr *)&ip.ip_dst; break; } #endif /* INET */ #ifdef INET6 case ETHERTYPE_IPV6: { if (m_length(m, NULL) < (sizeof(struct ether_header) + sizeof(ip6))) return (PF_DROP); af = AF_INET6; m_copydata(m, sizeof(struct ether_header), sizeof(ip6), (caddr_t)&ip6); src = (struct pf_addr *)&ip6.ip6_src; dst = (struct pf_addr *)&ip6.ip6_dst; break; } #endif /* INET6 */ } PF_RULES_RLOCK(); while (r != NULL) { counter_u64_add(r->evaluations, 1); SDT_PROBE2(pf, eth, test_rule, test, r->nr, r); if (pfi_kkif_match(r->kif, kif) == r->ifnot) { SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r, "kif"); r = r->skip[PFE_SKIP_IFP].ptr; } else if (r->direction && r->direction != dir) { SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r, "dir"); r = r->skip[PFE_SKIP_DIR].ptr; } else if (r->proto && r->proto != proto) { SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r, "proto"); r = r->skip[PFE_SKIP_PROTO].ptr; } else if (! pf_match_eth_addr(e->ether_shost, &r->src)) { SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r, "src"); r = r->skip[PFE_SKIP_SRC_ADDR].ptr; } else if (! pf_match_eth_addr(e->ether_dhost, &r->dst)) { SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r, "dst"); r = TAILQ_NEXT(r, entries); } else if (src != NULL && PF_MISMATCHAW(&r->ipsrc.addr, src, af, r->ipsrc.neg, kif, M_GETFIB(m))) { SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r, "ip_src"); r = TAILQ_NEXT(r, entries); } else if (dst != NULL && PF_MISMATCHAW(&r->ipdst.addr, dst, af, r->ipdst.neg, kif, M_GETFIB(m))) { SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r, "ip_dst"); r = TAILQ_NEXT(r, entries); } else if (r->match_tag && !pf_match_eth_tag(m, r, &tag, mtag ? mtag->tag : 0)) { SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r, "match_tag"); r = TAILQ_NEXT(r, entries); } else { if (r->tag) tag = r->tag; if (r->anchor == NULL) { /* Rule matches */ rm = r; SDT_PROBE2(pf, eth, test_rule, match, r->nr, r); if (r->quick) break; r = TAILQ_NEXT(r, entries); } else { pf_step_into_keth_anchor(anchor_stack, &asd, &ruleset, &r, &a, &match); } } if (r == NULL && pf_step_out_of_keth_anchor(anchor_stack, &asd, &ruleset, &r, &a, &match)) break; } r = rm; SDT_PROBE2(pf, eth, test_rule, final_match, (r != NULL ? r->nr : -1), r); /* Default to pass. */ if (r == NULL) { PF_RULES_RUNLOCK(); return (PF_PASS); } /* Execute action. */ counter_u64_add(r->packets[dir == PF_OUT], 1); counter_u64_add(r->bytes[dir == PF_OUT], m_length(m, NULL)); pf_update_timestamp(r); /* Shortcut. Don't tag if we're just going to drop anyway. */ if (r->action == PF_DROP) { PF_RULES_RUNLOCK(); return (PF_DROP); } if (tag > 0) { if (mtag == NULL) mtag = pf_get_mtag(m); if (mtag == NULL) { PF_RULES_RUNLOCK(); counter_u64_add(V_pf_status.counters[PFRES_MEMORY], 1); return (PF_DROP); } mtag->tag = tag; } if (r->qid != 0) { if (mtag == NULL) mtag = pf_get_mtag(m); if (mtag == NULL) { PF_RULES_RUNLOCK(); counter_u64_add(V_pf_status.counters[PFRES_MEMORY], 1); return (PF_DROP); } mtag->qid = r->qid; } /* Dummynet */ if (r->dnpipe) { struct ip_fw_args dnflow; /* Drop packet if dummynet is not loaded. */ if (ip_dn_io_ptr == NULL) { PF_RULES_RUNLOCK(); m_freem(m); counter_u64_add(V_pf_status.counters[PFRES_MEMORY], 1); return (PF_DROP); } if (mtag == NULL) mtag = pf_get_mtag(m); if (mtag == NULL) { PF_RULES_RUNLOCK(); counter_u64_add(V_pf_status.counters[PFRES_MEMORY], 1); return (PF_DROP); } bzero(&dnflow, sizeof(dnflow)); /* We don't have port numbers here, so we set 0. That means * that we'll be somewhat limited in distinguishing flows (i.e. * only based on IP addresses, not based on port numbers), but * it's better than nothing. */ dnflow.f_id.dst_port = 0; dnflow.f_id.src_port = 0; dnflow.f_id.proto = 0; dnflow.rule.info = r->dnpipe; dnflow.rule.info |= IPFW_IS_DUMMYNET; if (r->dnflags & PFRULE_DN_IS_PIPE) dnflow.rule.info |= IPFW_IS_PIPE; dnflow.f_id.extra = dnflow.rule.info; dnflow.flags = dir == PF_IN ? IPFW_ARGS_IN : IPFW_ARGS_OUT; dnflow.flags |= IPFW_ARGS_ETHER; dnflow.ifp = kif->pfik_ifp; switch (af) { case AF_INET: dnflow.f_id.addr_type = 4; dnflow.f_id.src_ip = src->v4.s_addr; dnflow.f_id.dst_ip = dst->v4.s_addr; break; case AF_INET6: dnflow.flags |= IPFW_ARGS_IP6; dnflow.f_id.addr_type = 6; dnflow.f_id.src_ip6 = src->v6; dnflow.f_id.dst_ip6 = dst->v6; break; } mtag->flags |= PF_TAG_DUMMYNET; ip_dn_io_ptr(m0, &dnflow); if (*m0 != NULL) mtag->flags &= ~PF_TAG_DUMMYNET; } action = r->action; PF_RULES_RUNLOCK(); return (action); } static int pf_test_rule(struct pf_krule **rm, struct pf_kstate **sm, int direction, struct pfi_kkif *kif, struct mbuf *m, int off, struct pf_pdesc *pd, struct pf_krule **am, struct pf_kruleset **rsm, struct inpcb *inp) { struct pf_krule *nr = NULL; struct pf_addr * const saddr = pd->src; struct pf_addr * const daddr = pd->dst; sa_family_t af = pd->af; struct pf_krule *r, *a = NULL; struct pf_kruleset *ruleset = NULL; struct pf_ksrc_node *nsn = NULL; struct tcphdr *th = &pd->hdr.tcp; struct pf_state_key *sk = NULL, *nk = NULL; u_short reason; int rewrite = 0, hdrlen = 0; int tag = -1, rtableid = -1; int asd = 0; int match = 0; int state_icmp = 0; u_int16_t sport = 0, dport = 0; u_int16_t bproto_sum = 0, bip_sum = 0; u_int8_t icmptype = 0, icmpcode = 0; struct pf_kanchor_stackframe anchor_stack[PF_ANCHOR_STACKSIZE]; PF_RULES_RASSERT(); if (inp != NULL) { INP_LOCK_ASSERT(inp); pd->lookup.uid = inp->inp_cred->cr_uid; pd->lookup.gid = inp->inp_cred->cr_groups[0]; pd->lookup.done = 1; } switch (pd->proto) { case IPPROTO_TCP: sport = th->th_sport; dport = th->th_dport; hdrlen = sizeof(*th); break; case IPPROTO_UDP: sport = pd->hdr.udp.uh_sport; dport = pd->hdr.udp.uh_dport; hdrlen = sizeof(pd->hdr.udp); break; #ifdef INET case IPPROTO_ICMP: if (pd->af != AF_INET) break; sport = dport = pd->hdr.icmp.icmp_id; hdrlen = sizeof(pd->hdr.icmp); icmptype = pd->hdr.icmp.icmp_type; icmpcode = pd->hdr.icmp.icmp_code; if (icmptype == ICMP_UNREACH || icmptype == ICMP_SOURCEQUENCH || icmptype == ICMP_REDIRECT || icmptype == ICMP_TIMXCEED || icmptype == ICMP_PARAMPROB) state_icmp++; break; #endif /* INET */ #ifdef INET6 case IPPROTO_ICMPV6: if (af != AF_INET6) break; sport = dport = pd->hdr.icmp6.icmp6_id; hdrlen = sizeof(pd->hdr.icmp6); icmptype = pd->hdr.icmp6.icmp6_type; icmpcode = pd->hdr.icmp6.icmp6_code; if (icmptype == ICMP6_DST_UNREACH || icmptype == ICMP6_PACKET_TOO_BIG || icmptype == ICMP6_TIME_EXCEEDED || icmptype == ICMP6_PARAM_PROB) state_icmp++; break; #endif /* INET6 */ default: sport = dport = hdrlen = 0; break; } r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); /* check packet for BINAT/NAT/RDR */ if ((nr = pf_get_translation(pd, m, off, direction, kif, &nsn, &sk, &nk, saddr, daddr, sport, dport, anchor_stack)) != NULL) { KASSERT(sk != NULL, ("%s: null sk", __func__)); KASSERT(nk != NULL, ("%s: null nk", __func__)); if (nr->log) { PFLOG_PACKET(kif, m, af, direction, PFRES_MATCH, nr, a, ruleset, pd, 1); } if (pd->ip_sum) bip_sum = *pd->ip_sum; switch (pd->proto) { case IPPROTO_TCP: bproto_sum = th->th_sum; pd->proto_sum = &th->th_sum; if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || nk->port[pd->sidx] != sport) { pf_change_ap(m, saddr, &th->th_sport, pd->ip_sum, &th->th_sum, &nk->addr[pd->sidx], nk->port[pd->sidx], 0, af); pd->sport = &th->th_sport; sport = th->th_sport; } if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || nk->port[pd->didx] != dport) { pf_change_ap(m, daddr, &th->th_dport, pd->ip_sum, &th->th_sum, &nk->addr[pd->didx], nk->port[pd->didx], 0, af); dport = th->th_dport; pd->dport = &th->th_dport; } rewrite++; break; case IPPROTO_UDP: bproto_sum = pd->hdr.udp.uh_sum; pd->proto_sum = &pd->hdr.udp.uh_sum; if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || nk->port[pd->sidx] != sport) { pf_change_ap(m, saddr, &pd->hdr.udp.uh_sport, pd->ip_sum, &pd->hdr.udp.uh_sum, &nk->addr[pd->sidx], nk->port[pd->sidx], 1, af); sport = pd->hdr.udp.uh_sport; pd->sport = &pd->hdr.udp.uh_sport; } if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || nk->port[pd->didx] != dport) { pf_change_ap(m, daddr, &pd->hdr.udp.uh_dport, pd->ip_sum, &pd->hdr.udp.uh_sum, &nk->addr[pd->didx], nk->port[pd->didx], 1, af); dport = pd->hdr.udp.uh_dport; pd->dport = &pd->hdr.udp.uh_dport; } rewrite++; break; #ifdef INET case IPPROTO_ICMP: nk->port[0] = nk->port[1]; if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET)) pf_change_a(&saddr->v4.s_addr, pd->ip_sum, nk->addr[pd->sidx].v4.s_addr, 0); if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET)) pf_change_a(&daddr->v4.s_addr, pd->ip_sum, nk->addr[pd->didx].v4.s_addr, 0); if (nk->port[1] != pd->hdr.icmp.icmp_id) { pd->hdr.icmp.icmp_cksum = pf_cksum_fixup( pd->hdr.icmp.icmp_cksum, sport, nk->port[1], 0); pd->hdr.icmp.icmp_id = nk->port[1]; pd->sport = &pd->hdr.icmp.icmp_id; } m_copyback(m, off, ICMP_MINLEN, (caddr_t)&pd->hdr.icmp); break; #endif /* INET */ #ifdef INET6 case IPPROTO_ICMPV6: nk->port[0] = nk->port[1]; if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET6)) pf_change_a6(saddr, &pd->hdr.icmp6.icmp6_cksum, &nk->addr[pd->sidx], 0); if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET6)) pf_change_a6(daddr, &pd->hdr.icmp6.icmp6_cksum, &nk->addr[pd->didx], 0); rewrite++; break; #endif /* INET */ default: switch (af) { #ifdef INET case AF_INET: if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET)) pf_change_a(&saddr->v4.s_addr, pd->ip_sum, nk->addr[pd->sidx].v4.s_addr, 0); if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET)) pf_change_a(&daddr->v4.s_addr, pd->ip_sum, nk->addr[pd->didx].v4.s_addr, 0); break; #endif /* INET */ #ifdef INET6 case AF_INET6: if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET6)) PF_ACPY(saddr, &nk->addr[pd->sidx], af); if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET6)) PF_ACPY(daddr, &nk->addr[pd->didx], af); break; #endif /* INET */ } break; } if (nr->natpass) r = NULL; pd->nat_rule = nr; } while (r != NULL) { pf_counter_u64_add(&r->evaluations, 1); if (pfi_kkif_match(r->kif, kif) == r->ifnot) r = r->skip[PF_SKIP_IFP].ptr; else if (r->direction && r->direction != direction) r = r->skip[PF_SKIP_DIR].ptr; else if (r->af && r->af != af) r = r->skip[PF_SKIP_AF].ptr; else if (r->proto && r->proto != pd->proto) r = r->skip[PF_SKIP_PROTO].ptr; else if (PF_MISMATCHAW(&r->src.addr, saddr, af, r->src.neg, kif, M_GETFIB(m))) r = r->skip[PF_SKIP_SRC_ADDR].ptr; /* tcp/udp only. port_op always 0 in other cases */ else if (r->src.port_op && !pf_match_port(r->src.port_op, r->src.port[0], r->src.port[1], sport)) r = r->skip[PF_SKIP_SRC_PORT].ptr; else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, r->dst.neg, NULL, M_GETFIB(m))) r = r->skip[PF_SKIP_DST_ADDR].ptr; /* tcp/udp only. port_op always 0 in other cases */ else if (r->dst.port_op && !pf_match_port(r->dst.port_op, r->dst.port[0], r->dst.port[1], dport)) r = r->skip[PF_SKIP_DST_PORT].ptr; /* icmp only. type always 0 in other cases */ else if (r->type && r->type != icmptype + 1) r = TAILQ_NEXT(r, entries); /* icmp only. type always 0 in other cases */ else if (r->code && r->code != icmpcode + 1) r = TAILQ_NEXT(r, entries); else if (r->tos && !(r->tos == pd->tos)) r = TAILQ_NEXT(r, entries); else if (r->rule_flag & PFRULE_FRAGMENT) r = TAILQ_NEXT(r, entries); else if (pd->proto == IPPROTO_TCP && (r->flagset & th->th_flags) != r->flags) r = TAILQ_NEXT(r, entries); /* tcp/udp only. uid.op always 0 in other cases */ else if (r->uid.op && (pd->lookup.done || (pd->lookup.done = pf_socket_lookup(direction, pd, m), 1)) && !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], pd->lookup.uid)) r = TAILQ_NEXT(r, entries); /* tcp/udp only. gid.op always 0 in other cases */ else if (r->gid.op && (pd->lookup.done || (pd->lookup.done = pf_socket_lookup(direction, pd, m), 1)) && !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], pd->lookup.gid)) r = TAILQ_NEXT(r, entries); else if (r->prio && !pf_match_ieee8021q_pcp(r->prio, m)) r = TAILQ_NEXT(r, entries); else if (r->prob && r->prob <= arc4random()) r = TAILQ_NEXT(r, entries); else if (r->match_tag && !pf_match_tag(m, r, &tag, pd->pf_mtag ? pd->pf_mtag->tag : 0)) r = TAILQ_NEXT(r, entries); else if (r->os_fingerprint != PF_OSFP_ANY && (pd->proto != IPPROTO_TCP || !pf_osfp_match( pf_osfp_fingerprint(pd, m, off, th), r->os_fingerprint))) r = TAILQ_NEXT(r, entries); else { if (r->tag) tag = r->tag; if (r->rtableid >= 0) rtableid = r->rtableid; if (r->anchor == NULL) { if (r->action == PF_MATCH) { pf_counter_u64_critical_enter(); pf_counter_u64_add_protected(&r->packets[direction == PF_OUT], 1); pf_counter_u64_add_protected(&r->bytes[direction == PF_OUT], pd->tot_len); pf_counter_u64_critical_exit(); pf_rule_to_actions(r, &pd->act); if (r->log) PFLOG_PACKET(kif, m, af, direction, PFRES_MATCH, r, a, ruleset, pd, 1); } else { match = 1; *rm = r; *am = a; *rsm = ruleset; } if ((*rm)->quick) break; r = TAILQ_NEXT(r, entries); } else pf_step_into_anchor(anchor_stack, &asd, &ruleset, PF_RULESET_FILTER, &r, &a, &match); } if (r == NULL && pf_step_out_of_anchor(anchor_stack, &asd, &ruleset, PF_RULESET_FILTER, &r, &a, &match)) break; } r = *rm; a = *am; ruleset = *rsm; REASON_SET(&reason, PFRES_MATCH); /* apply actions for last matching pass/block rule */ pf_rule_to_actions(r, &pd->act); if (r->log) { if (rewrite) m_copyback(m, off, hdrlen, pd->hdr.any); PFLOG_PACKET(kif, m, af, direction, reason, r, a, ruleset, pd, 1); } if ((r->action == PF_DROP) && ((r->rule_flag & PFRULE_RETURNRST) || (r->rule_flag & PFRULE_RETURNICMP) || (r->rule_flag & PFRULE_RETURN))) { pf_return(r, nr, pd, sk, off, m, th, kif, bproto_sum, bip_sum, hdrlen, &reason); } if (r->action == PF_DROP) goto cleanup; if (tag > 0 && pf_tag_packet(m, pd, tag)) { REASON_SET(&reason, PFRES_MEMORY); goto cleanup; } if (rtableid >= 0) M_SETFIB(m, rtableid); if (!state_icmp && (r->keep_state || nr != NULL || (pd->flags & PFDESC_TCP_NORM))) { int action; action = pf_create_state(r, nr, a, pd, nsn, nk, sk, m, off, sport, dport, &rewrite, kif, sm, tag, bproto_sum, bip_sum, hdrlen); if (action != PF_PASS) { if (action == PF_DROP && (r->rule_flag & PFRULE_RETURN)) pf_return(r, nr, pd, sk, off, m, th, kif, bproto_sum, bip_sum, hdrlen, &reason); return (action); } } else { if (sk != NULL) uma_zfree(V_pf_state_key_z, sk); if (nk != NULL) uma_zfree(V_pf_state_key_z, nk); } /* copy back packet headers if we performed NAT operations */ if (rewrite) m_copyback(m, off, hdrlen, pd->hdr.any); if (*sm != NULL && !((*sm)->state_flags & PFSTATE_NOSYNC) && direction == PF_OUT && V_pfsync_defer_ptr != NULL && V_pfsync_defer_ptr(*sm, m)) /* * We want the state created, but we dont * want to send this in case a partner * firewall has to know about it to allow * replies through it. */ return (PF_DEFER); return (PF_PASS); cleanup: if (sk != NULL) uma_zfree(V_pf_state_key_z, sk); if (nk != NULL) uma_zfree(V_pf_state_key_z, nk); return (PF_DROP); } static int pf_create_state(struct pf_krule *r, struct pf_krule *nr, struct pf_krule *a, struct pf_pdesc *pd, struct pf_ksrc_node *nsn, struct pf_state_key *nk, struct pf_state_key *sk, struct mbuf *m, int off, u_int16_t sport, u_int16_t dport, int *rewrite, struct pfi_kkif *kif, struct pf_kstate **sm, int tag, u_int16_t bproto_sum, u_int16_t bip_sum, int hdrlen) { struct pf_kstate *s = NULL; struct pf_ksrc_node *sn = NULL; struct tcphdr *th = &pd->hdr.tcp; u_int16_t mss = V_tcp_mssdflt; u_short reason; /* check maximums */ if (r->max_states && (counter_u64_fetch(r->states_cur) >= r->max_states)) { counter_u64_add(V_pf_status.lcounters[LCNT_STATES], 1); REASON_SET(&reason, PFRES_MAXSTATES); goto csfailed; } /* src node for filter rule */ if ((r->rule_flag & PFRULE_SRCTRACK || r->rpool.opts & PF_POOL_STICKYADDR) && pf_insert_src_node(&sn, r, pd->src, pd->af) != 0) { REASON_SET(&reason, PFRES_SRCLIMIT); goto csfailed; } /* src node for translation rule */ if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && pf_insert_src_node(&nsn, nr, &sk->addr[pd->sidx], pd->af)) { REASON_SET(&reason, PFRES_SRCLIMIT); goto csfailed; } s = pf_alloc_state(M_NOWAIT); if (s == NULL) { REASON_SET(&reason, PFRES_MEMORY); goto csfailed; } s->rule.ptr = r; s->nat_rule.ptr = nr; s->anchor.ptr = a; STATE_INC_COUNTERS(s); if (r->allow_opts) s->state_flags |= PFSTATE_ALLOWOPTS; if (r->rule_flag & PFRULE_STATESLOPPY) s->state_flags |= PFSTATE_SLOPPY; s->log = r->log & PF_LOG_ALL; s->sync_state = PFSYNC_S_NONE; s->qid = pd->act.qid; s->pqid = pd->act.pqid; s->dnpipe = pd->act.dnpipe; s->dnrpipe = pd->act.dnrpipe; s->state_flags |= pd->act.flags; if (nr != NULL) s->log |= nr->log & PF_LOG_ALL; switch (pd->proto) { case IPPROTO_TCP: s->src.seqlo = ntohl(th->th_seq); s->src.seqhi = s->src.seqlo + pd->p_len + 1; if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && r->keep_state == PF_STATE_MODULATE) { /* Generate sequence number modulator */ if ((s->src.seqdiff = pf_tcp_iss(pd) - s->src.seqlo) == 0) s->src.seqdiff = 1; pf_change_proto_a(m, &th->th_seq, &th->th_sum, htonl(s->src.seqlo + s->src.seqdiff), 0); *rewrite = 1; } else s->src.seqdiff = 0; if (th->th_flags & TH_SYN) { s->src.seqhi++; s->src.wscale = pf_get_wscale(m, off, th->th_off, pd->af); } s->src.max_win = MAX(ntohs(th->th_win), 1); if (s->src.wscale & PF_WSCALE_MASK) { /* Remove scale factor from initial window */ int win = s->src.max_win; win += 1 << (s->src.wscale & PF_WSCALE_MASK); s->src.max_win = (win - 1) >> (s->src.wscale & PF_WSCALE_MASK); } if (th->th_flags & TH_FIN) s->src.seqhi++; s->dst.seqhi = 1; s->dst.max_win = 1; pf_set_protostate(s, PF_PEER_SRC, TCPS_SYN_SENT); pf_set_protostate(s, PF_PEER_DST, TCPS_CLOSED); s->timeout = PFTM_TCP_FIRST_PACKET; atomic_add_32(&V_pf_status.states_halfopen, 1); break; case IPPROTO_UDP: pf_set_protostate(s, PF_PEER_SRC, PFUDPS_SINGLE); pf_set_protostate(s, PF_PEER_DST, PFUDPS_NO_TRAFFIC); s->timeout = PFTM_UDP_FIRST_PACKET; break; case IPPROTO_ICMP: #ifdef INET6 case IPPROTO_ICMPV6: #endif s->timeout = PFTM_ICMP_FIRST_PACKET; break; default: pf_set_protostate(s, PF_PEER_SRC, PFOTHERS_SINGLE); pf_set_protostate(s, PF_PEER_DST, PFOTHERS_NO_TRAFFIC); s->timeout = PFTM_OTHER_FIRST_PACKET; } if (r->rt) { if (pf_map_addr(pd->af, r, pd->src, &s->rt_addr, NULL, &sn)) { REASON_SET(&reason, PFRES_MAPFAILED); pf_src_tree_remove_state(s); s->timeout = PFTM_UNLINKED; STATE_DEC_COUNTERS(s); pf_free_state(s); goto csfailed; } s->rt_kif = r->rpool.cur->kif; } s->creation = time_uptime; s->expire = time_uptime; if (sn != NULL) s->src_node = sn; if (nsn != NULL) { /* XXX We only modify one side for now. */ PF_ACPY(&nsn->raddr, &nk->addr[1], pd->af); s->nat_src_node = nsn; } if (pd->proto == IPPROTO_TCP) { if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m, off, pd, th, &s->src, &s->dst)) { REASON_SET(&reason, PFRES_MEMORY); pf_src_tree_remove_state(s); s->timeout = PFTM_UNLINKED; STATE_DEC_COUNTERS(s); pf_free_state(s); return (PF_DROP); } if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub && pf_normalize_tcp_stateful(m, off, pd, &reason, th, s, &s->src, &s->dst, rewrite)) { /* This really shouldn't happen!!! */ DPFPRINTF(PF_DEBUG_URGENT, ("pf_normalize_tcp_stateful failed on first " "pkt\n")); pf_src_tree_remove_state(s); s->timeout = PFTM_UNLINKED; STATE_DEC_COUNTERS(s); pf_free_state(s); return (PF_DROP); } } s->direction = pd->dir; /* * sk/nk could already been setup by pf_get_translation(). */ if (nr == NULL) { KASSERT((sk == NULL && nk == NULL), ("%s: nr %p sk %p, nk %p", __func__, nr, sk, nk)); sk = pf_state_key_setup(pd, pd->src, pd->dst, sport, dport); if (sk == NULL) goto csfailed; nk = sk; } else KASSERT((sk != NULL && nk != NULL), ("%s: nr %p sk %p, nk %p", __func__, nr, sk, nk)); /* Swap sk/nk for PF_OUT. */ if (pf_state_insert(BOUND_IFACE(r, kif), kif, (pd->dir == PF_IN) ? sk : nk, (pd->dir == PF_IN) ? nk : sk, s)) { REASON_SET(&reason, PFRES_STATEINS); pf_src_tree_remove_state(s); s->timeout = PFTM_UNLINKED; STATE_DEC_COUNTERS(s); pf_free_state(s); return (PF_DROP); } else *sm = s; if (tag > 0) s->tag = tag; if (pd->proto == IPPROTO_TCP && (th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && r->keep_state == PF_STATE_SYNPROXY) { pf_set_protostate(s, PF_PEER_SRC, PF_TCPS_PROXY_SRC); /* undo NAT changes, if they have taken place */ if (nr != NULL) { struct pf_state_key *skt = s->key[PF_SK_WIRE]; if (pd->dir == PF_OUT) skt = s->key[PF_SK_STACK]; PF_ACPY(pd->src, &skt->addr[pd->sidx], pd->af); PF_ACPY(pd->dst, &skt->addr[pd->didx], pd->af); if (pd->sport) *pd->sport = skt->port[pd->sidx]; if (pd->dport) *pd->dport = skt->port[pd->didx]; if (pd->proto_sum) *pd->proto_sum = bproto_sum; if (pd->ip_sum) *pd->ip_sum = bip_sum; m_copyback(m, off, hdrlen, pd->hdr.any); } s->src.seqhi = htonl(arc4random()); /* Find mss option */ int rtid = M_GETFIB(m); mss = pf_get_mss(m, off, th->th_off, pd->af); mss = pf_calc_mss(pd->src, pd->af, rtid, mss); mss = pf_calc_mss(pd->dst, pd->af, rtid, mss); s->src.mss = mss; pf_send_tcp(r, pd->af, pd->dst, pd->src, th->th_dport, th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1, TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0); REASON_SET(&reason, PFRES_SYNPROXY); return (PF_SYNPROXY_DROP); } return (PF_PASS); csfailed: if (sk != NULL) uma_zfree(V_pf_state_key_z, sk); if (nk != NULL) uma_zfree(V_pf_state_key_z, nk); if (sn != NULL) { struct pf_srchash *sh; sh = &V_pf_srchash[pf_hashsrc(&sn->addr, sn->af)]; PF_HASHROW_LOCK(sh); if (--sn->states == 0 && sn->expire == 0) { pf_unlink_src_node(sn); uma_zfree(V_pf_sources_z, sn); counter_u64_add( V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], 1); } PF_HASHROW_UNLOCK(sh); } if (nsn != sn && nsn != NULL) { struct pf_srchash *sh; sh = &V_pf_srchash[pf_hashsrc(&nsn->addr, nsn->af)]; PF_HASHROW_LOCK(sh); if (--nsn->states == 0 && nsn->expire == 0) { pf_unlink_src_node(nsn); uma_zfree(V_pf_sources_z, nsn); counter_u64_add( V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], 1); } PF_HASHROW_UNLOCK(sh); } return (PF_DROP); } static int pf_test_fragment(struct pf_krule **rm, int direction, struct pfi_kkif *kif, struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_krule **am, struct pf_kruleset **rsm) { struct pf_krule *r, *a = NULL; struct pf_kruleset *ruleset = NULL; sa_family_t af = pd->af; u_short reason; int tag = -1; int asd = 0; int match = 0; struct pf_kanchor_stackframe anchor_stack[PF_ANCHOR_STACKSIZE]; PF_RULES_RASSERT(); r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); while (r != NULL) { pf_counter_u64_add(&r->evaluations, 1); if (pfi_kkif_match(r->kif, kif) == r->ifnot) r = r->skip[PF_SKIP_IFP].ptr; else if (r->direction && r->direction != direction) r = r->skip[PF_SKIP_DIR].ptr; else if (r->af && r->af != af) r = r->skip[PF_SKIP_AF].ptr; else if (r->proto && r->proto != pd->proto) r = r->skip[PF_SKIP_PROTO].ptr; else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, r->src.neg, kif, M_GETFIB(m))) r = r->skip[PF_SKIP_SRC_ADDR].ptr; else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, r->dst.neg, NULL, M_GETFIB(m))) r = r->skip[PF_SKIP_DST_ADDR].ptr; else if (r->tos && !(r->tos == pd->tos)) r = TAILQ_NEXT(r, entries); else if (r->os_fingerprint != PF_OSFP_ANY) r = TAILQ_NEXT(r, entries); else if (pd->proto == IPPROTO_UDP && (r->src.port_op || r->dst.port_op)) r = TAILQ_NEXT(r, entries); else if (pd->proto == IPPROTO_TCP && (r->src.port_op || r->dst.port_op || r->flagset)) r = TAILQ_NEXT(r, entries); else if ((pd->proto == IPPROTO_ICMP || pd->proto == IPPROTO_ICMPV6) && (r->type || r->code)) r = TAILQ_NEXT(r, entries); else if (r->prio && !pf_match_ieee8021q_pcp(r->prio, m)) r = TAILQ_NEXT(r, entries); else if (r->prob && r->prob <= (arc4random() % (UINT_MAX - 1) + 1)) r = TAILQ_NEXT(r, entries); else if (r->match_tag && !pf_match_tag(m, r, &tag, pd->pf_mtag ? pd->pf_mtag->tag : 0)) r = TAILQ_NEXT(r, entries); else { if (r->anchor == NULL) { if (r->action == PF_MATCH) { pf_counter_u64_critical_enter(); pf_counter_u64_add_protected(&r->packets[direction == PF_OUT], 1); pf_counter_u64_add_protected(&r->bytes[direction == PF_OUT], pd->tot_len); pf_counter_u64_critical_exit(); pf_rule_to_actions(r, &pd->act); if (r->log) PFLOG_PACKET(kif, m, af, direction, PFRES_MATCH, r, a, ruleset, pd, 1); } else { match = 1; *rm = r; *am = a; *rsm = ruleset; } if ((*rm)->quick) break; r = TAILQ_NEXT(r, entries); } else pf_step_into_anchor(anchor_stack, &asd, &ruleset, PF_RULESET_FILTER, &r, &a, &match); } if (r == NULL && pf_step_out_of_anchor(anchor_stack, &asd, &ruleset, PF_RULESET_FILTER, &r, &a, &match)) break; } r = *rm; a = *am; ruleset = *rsm; REASON_SET(&reason, PFRES_MATCH); /* apply actions for last matching pass/block rule */ pf_rule_to_actions(r, &pd->act); if (r->log) PFLOG_PACKET(kif, m, af, direction, reason, r, a, ruleset, pd, 1); if (r->action != PF_PASS) return (PF_DROP); if (tag > 0 && pf_tag_packet(m, pd, tag)) { REASON_SET(&reason, PFRES_MEMORY); return (PF_DROP); } return (PF_PASS); } static int pf_tcp_track_full(struct pf_kstate **state, struct pfi_kkif *kif, struct mbuf *m, int off, struct pf_pdesc *pd, u_short *reason, int *copyback) { struct tcphdr *th = &pd->hdr.tcp; struct pf_state_peer *src, *dst; u_int16_t win = ntohs(th->th_win); u_int32_t ack, end, seq, orig_seq; u_int8_t sws, dws, psrc, pdst; int ackskew; if (pd->dir == (*state)->direction) { src = &(*state)->src; dst = &(*state)->dst; psrc = PF_PEER_SRC; pdst = PF_PEER_DST; } else { src = &(*state)->dst; dst = &(*state)->src; psrc = PF_PEER_DST; pdst = PF_PEER_SRC; } if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) { sws = src->wscale & PF_WSCALE_MASK; dws = dst->wscale & PF_WSCALE_MASK; } else sws = dws = 0; /* * Sequence tracking algorithm from Guido van Rooij's paper: * http://www.madison-gurkha.com/publications/tcp_filtering/ * tcp_filtering.ps */ orig_seq = seq = ntohl(th->th_seq); if (src->seqlo == 0) { /* First packet from this end. Set its state */ if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) && src->scrub == NULL) { if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) { REASON_SET(reason, PFRES_MEMORY); return (PF_DROP); } } /* Deferred generation of sequence number modulator */ if (dst->seqdiff && !src->seqdiff) { /* use random iss for the TCP server */ while ((src->seqdiff = arc4random() - seq) == 0) ; ack = ntohl(th->th_ack) - dst->seqdiff; pf_change_proto_a(m, &th->th_seq, &th->th_sum, htonl(seq + src->seqdiff), 0); pf_change_proto_a(m, &th->th_ack, &th->th_sum, htonl(ack), 0); *copyback = 1; } else { ack = ntohl(th->th_ack); } end = seq + pd->p_len; if (th->th_flags & TH_SYN) { end++; if (dst->wscale & PF_WSCALE_FLAG) { src->wscale = pf_get_wscale(m, off, th->th_off, pd->af); if (src->wscale & PF_WSCALE_FLAG) { /* Remove scale factor from initial * window */ sws = src->wscale & PF_WSCALE_MASK; win = ((u_int32_t)win + (1 << sws) - 1) >> sws; dws = dst->wscale & PF_WSCALE_MASK; } else { /* fixup other window */ dst->max_win <<= dst->wscale & PF_WSCALE_MASK; /* in case of a retrans SYN|ACK */ dst->wscale = 0; } } } if (th->th_flags & TH_FIN) end++; src->seqlo = seq; if (src->state < TCPS_SYN_SENT) pf_set_protostate(*state, psrc, TCPS_SYN_SENT); /* * May need to slide the window (seqhi may have been set by * the crappy stack check or if we picked up the connection * after establishment) */ if (src->seqhi == 1 || SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi)) src->seqhi = end + MAX(1, dst->max_win << dws); if (win > src->max_win) src->max_win = win; } else { ack = ntohl(th->th_ack) - dst->seqdiff; if (src->seqdiff) { /* Modulate sequence numbers */ pf_change_proto_a(m, &th->th_seq, &th->th_sum, htonl(seq + src->seqdiff), 0); pf_change_proto_a(m, &th->th_ack, &th->th_sum, htonl(ack), 0); *copyback = 1; } end = seq + pd->p_len; if (th->th_flags & TH_SYN) end++; if (th->th_flags & TH_FIN) end++; } if ((th->th_flags & TH_ACK) == 0) { /* Let it pass through the ack skew check */ ack = dst->seqlo; } else if ((ack == 0 && (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) || /* broken tcp stacks do not set ack */ (dst->state < TCPS_SYN_SENT)) { /* * Many stacks (ours included) will set the ACK number in an * FIN|ACK if the SYN times out -- no sequence to ACK. */ ack = dst->seqlo; } if (seq == end) { /* Ease sequencing restrictions on no data packets */ seq = src->seqlo; end = seq; } ackskew = dst->seqlo - ack; /* * Need to demodulate the sequence numbers in any TCP SACK options * (Selective ACK). We could optionally validate the SACK values * against the current ACK window, either forwards or backwards, but * I'm not confident that SACK has been implemented properly * everywhere. It wouldn't surprise me if several stacks accidentally * SACK too far backwards of previously ACKed data. There really aren't * any security implications of bad SACKing unless the target stack * doesn't validate the option length correctly. Someone trying to * spoof into a TCP connection won't bother blindly sending SACK * options anyway. */ if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) { if (pf_modulate_sack(m, off, pd, th, dst)) *copyback = 1; } #define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */ if (SEQ_GEQ(src->seqhi, end) && /* Last octet inside other's window space */ SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) && /* Retrans: not more than one window back */ (ackskew >= -MAXACKWINDOW) && /* Acking not more than one reassembled fragment backwards */ (ackskew <= (MAXACKWINDOW << sws)) && /* Acking not more than one window forward */ ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo || (orig_seq == src->seqlo + 1) || (orig_seq + 1 == src->seqlo) || (pd->flags & PFDESC_IP_REAS) == 0)) { /* Require an exact/+1 sequence match on resets when possible */ if (dst->scrub || src->scrub) { if (pf_normalize_tcp_stateful(m, off, pd, reason, th, *state, src, dst, copyback)) return (PF_DROP); } /* update max window */ if (src->max_win < win) src->max_win = win; /* synchronize sequencing */ if (SEQ_GT(end, src->seqlo)) src->seqlo = end; /* slide the window of what the other end can send */ if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) dst->seqhi = ack + MAX((win << sws), 1); /* update states */ if (th->th_flags & TH_SYN) if (src->state < TCPS_SYN_SENT) pf_set_protostate(*state, psrc, TCPS_SYN_SENT); if (th->th_flags & TH_FIN) if (src->state < TCPS_CLOSING) pf_set_protostate(*state, psrc, TCPS_CLOSING); if (th->th_flags & TH_ACK) { if (dst->state == TCPS_SYN_SENT) { pf_set_protostate(*state, pdst, TCPS_ESTABLISHED); if (src->state == TCPS_ESTABLISHED && (*state)->src_node != NULL && pf_src_connlimit(state)) { REASON_SET(reason, PFRES_SRCLIMIT); return (PF_DROP); } } else if (dst->state == TCPS_CLOSING) pf_set_protostate(*state, pdst, TCPS_FIN_WAIT_2); } if (th->th_flags & TH_RST) pf_set_protostate(*state, PF_PEER_BOTH, TCPS_TIME_WAIT); /* update expire time */ (*state)->expire = time_uptime; if (src->state >= TCPS_FIN_WAIT_2 && dst->state >= TCPS_FIN_WAIT_2) (*state)->timeout = PFTM_TCP_CLOSED; else if (src->state >= TCPS_CLOSING && dst->state >= TCPS_CLOSING) (*state)->timeout = PFTM_TCP_FIN_WAIT; else if (src->state < TCPS_ESTABLISHED || dst->state < TCPS_ESTABLISHED) (*state)->timeout = PFTM_TCP_OPENING; else if (src->state >= TCPS_CLOSING || dst->state >= TCPS_CLOSING) (*state)->timeout = PFTM_TCP_CLOSING; else (*state)->timeout = PFTM_TCP_ESTABLISHED; /* Fall through to PASS packet */ } else if ((dst->state < TCPS_SYN_SENT || dst->state >= TCPS_FIN_WAIT_2 || src->state >= TCPS_FIN_WAIT_2) && SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) && /* Within a window forward of the originating packet */ SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) { /* Within a window backward of the originating packet */ /* * This currently handles three situations: * 1) Stupid stacks will shotgun SYNs before their peer * replies. * 2) When PF catches an already established stream (the * firewall rebooted, the state table was flushed, routes * changed...) * 3) Packets get funky immediately after the connection * closes (this should catch Solaris spurious ACK|FINs * that web servers like to spew after a close) * * This must be a little more careful than the above code * since packet floods will also be caught here. We don't * update the TTL here to mitigate the damage of a packet * flood and so the same code can handle awkward establishment * and a loosened connection close. * In the establishment case, a correct peer response will * validate the connection, go through the normal state code * and keep updating the state TTL. */ if (V_pf_status.debug >= PF_DEBUG_MISC) { printf("pf: loose state match: "); pf_print_state(*state); pf_print_flags(th->th_flags); printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " "pkts=%llu:%llu dir=%s,%s\n", seq, orig_seq, ack, pd->p_len, ackskew, (unsigned long long)(*state)->packets[0], (unsigned long long)(*state)->packets[1], pd->dir == PF_IN ? "in" : "out", pd->dir == (*state)->direction ? "fwd" : "rev"); } if (dst->scrub || src->scrub) { if (pf_normalize_tcp_stateful(m, off, pd, reason, th, *state, src, dst, copyback)) return (PF_DROP); } /* update max window */ if (src->max_win < win) src->max_win = win; /* synchronize sequencing */ if (SEQ_GT(end, src->seqlo)) src->seqlo = end; /* slide the window of what the other end can send */ if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) dst->seqhi = ack + MAX((win << sws), 1); /* * Cannot set dst->seqhi here since this could be a shotgunned * SYN and not an already established connection. */ if (th->th_flags & TH_FIN) if (src->state < TCPS_CLOSING) pf_set_protostate(*state, psrc, TCPS_CLOSING); if (th->th_flags & TH_RST) pf_set_protostate(*state, PF_PEER_BOTH, TCPS_TIME_WAIT); /* Fall through to PASS packet */ } else { if ((*state)->dst.state == TCPS_SYN_SENT && (*state)->src.state == TCPS_SYN_SENT) { /* Send RST for state mismatches during handshake */ if (!(th->th_flags & TH_RST)) pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, pd->src, th->th_dport, th->th_sport, ntohl(th->th_ack), 0, TH_RST, 0, 0, (*state)->rule.ptr->return_ttl, 1, 0); src->seqlo = 0; src->seqhi = 1; src->max_win = 1; } else if (V_pf_status.debug >= PF_DEBUG_MISC) { printf("pf: BAD state: "); pf_print_state(*state); pf_print_flags(th->th_flags); printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " "pkts=%llu:%llu dir=%s,%s\n", seq, orig_seq, ack, pd->p_len, ackskew, (unsigned long long)(*state)->packets[0], (unsigned long long)(*state)->packets[1], pd->dir == PF_IN ? "in" : "out", pd->dir == (*state)->direction ? "fwd" : "rev"); printf("pf: State failure on: %c %c %c %c | %c %c\n", SEQ_GEQ(src->seqhi, end) ? ' ' : '1', SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ? ' ': '2', (ackskew >= -MAXACKWINDOW) ? ' ' : '3', (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4', SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5', SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6'); } REASON_SET(reason, PFRES_BADSTATE); return (PF_DROP); } return (PF_PASS); } static int pf_tcp_track_sloppy(struct pf_kstate **state, struct pf_pdesc *pd, u_short *reason) { struct tcphdr *th = &pd->hdr.tcp; struct pf_state_peer *src, *dst; u_int8_t psrc, pdst; if (pd->dir == (*state)->direction) { src = &(*state)->src; dst = &(*state)->dst; psrc = PF_PEER_SRC; pdst = PF_PEER_DST; } else { src = &(*state)->dst; dst = &(*state)->src; psrc = PF_PEER_DST; pdst = PF_PEER_SRC; } if (th->th_flags & TH_SYN) if (src->state < TCPS_SYN_SENT) pf_set_protostate(*state, psrc, TCPS_SYN_SENT); if (th->th_flags & TH_FIN) if (src->state < TCPS_CLOSING) pf_set_protostate(*state, psrc, TCPS_CLOSING); if (th->th_flags & TH_ACK) { if (dst->state == TCPS_SYN_SENT) { pf_set_protostate(*state, pdst, TCPS_ESTABLISHED); if (src->state == TCPS_ESTABLISHED && (*state)->src_node != NULL && pf_src_connlimit(state)) { REASON_SET(reason, PFRES_SRCLIMIT); return (PF_DROP); } } else if (dst->state == TCPS_CLOSING) { pf_set_protostate(*state, pdst, TCPS_FIN_WAIT_2); } else if (src->state == TCPS_SYN_SENT && dst->state < TCPS_SYN_SENT) { /* * Handle a special sloppy case where we only see one * half of the connection. If there is a ACK after * the initial SYN without ever seeing a packet from * the destination, set the connection to established. */ pf_set_protostate(*state, PF_PEER_BOTH, TCPS_ESTABLISHED); dst->state = src->state = TCPS_ESTABLISHED; if ((*state)->src_node != NULL && pf_src_connlimit(state)) { REASON_SET(reason, PFRES_SRCLIMIT); return (PF_DROP); } } else if (src->state == TCPS_CLOSING && dst->state == TCPS_ESTABLISHED && dst->seqlo == 0) { /* * Handle the closing of half connections where we * don't see the full bidirectional FIN/ACK+ACK * handshake. */ pf_set_protostate(*state, pdst, TCPS_CLOSING); } } if (th->th_flags & TH_RST) pf_set_protostate(*state, PF_PEER_BOTH, TCPS_TIME_WAIT); /* update expire time */ (*state)->expire = time_uptime; if (src->state >= TCPS_FIN_WAIT_2 && dst->state >= TCPS_FIN_WAIT_2) (*state)->timeout = PFTM_TCP_CLOSED; else if (src->state >= TCPS_CLOSING && dst->state >= TCPS_CLOSING) (*state)->timeout = PFTM_TCP_FIN_WAIT; else if (src->state < TCPS_ESTABLISHED || dst->state < TCPS_ESTABLISHED) (*state)->timeout = PFTM_TCP_OPENING; else if (src->state >= TCPS_CLOSING || dst->state >= TCPS_CLOSING) (*state)->timeout = PFTM_TCP_CLOSING; else (*state)->timeout = PFTM_TCP_ESTABLISHED; return (PF_PASS); } static int pf_synproxy(struct pf_pdesc *pd, struct pf_kstate **state, u_short *reason) { struct pf_state_key *sk = (*state)->key[pd->didx]; struct tcphdr *th = &pd->hdr.tcp; if ((*state)->src.state == PF_TCPS_PROXY_SRC) { if (pd->dir != (*state)->direction) { REASON_SET(reason, PFRES_SYNPROXY); return (PF_SYNPROXY_DROP); } if (th->th_flags & TH_SYN) { if (ntohl(th->th_seq) != (*state)->src.seqlo) { REASON_SET(reason, PFRES_SYNPROXY); return (PF_DROP); } pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, pd->src, th->th_dport, th->th_sport, (*state)->src.seqhi, ntohl(th->th_seq) + 1, TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1, 0); REASON_SET(reason, PFRES_SYNPROXY); return (PF_SYNPROXY_DROP); } else if ((th->th_flags & (TH_ACK|TH_RST|TH_FIN)) != TH_ACK || (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { REASON_SET(reason, PFRES_SYNPROXY); return (PF_DROP); } else if ((*state)->src_node != NULL && pf_src_connlimit(state)) { REASON_SET(reason, PFRES_SRCLIMIT); return (PF_DROP); } else pf_set_protostate(*state, PF_PEER_SRC, PF_TCPS_PROXY_DST); } if ((*state)->src.state == PF_TCPS_PROXY_DST) { if (pd->dir == (*state)->direction) { if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) || (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { REASON_SET(reason, PFRES_SYNPROXY); return (PF_DROP); } (*state)->src.max_win = MAX(ntohs(th->th_win), 1); if ((*state)->dst.seqhi == 1) (*state)->dst.seqhi = htonl(arc4random()); pf_send_tcp((*state)->rule.ptr, pd->af, &sk->addr[pd->sidx], &sk->addr[pd->didx], sk->port[pd->sidx], sk->port[pd->didx], (*state)->dst.seqhi, 0, TH_SYN, 0, (*state)->src.mss, 0, 0, (*state)->tag); REASON_SET(reason, PFRES_SYNPROXY); return (PF_SYNPROXY_DROP); } else if (((th->th_flags & (TH_SYN|TH_ACK)) != (TH_SYN|TH_ACK)) || (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) { REASON_SET(reason, PFRES_SYNPROXY); return (PF_DROP); } else { (*state)->dst.max_win = MAX(ntohs(th->th_win), 1); (*state)->dst.seqlo = ntohl(th->th_seq); pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, pd->src, th->th_dport, th->th_sport, ntohl(th->th_ack), ntohl(th->th_seq) + 1, TH_ACK, (*state)->src.max_win, 0, 0, 0, (*state)->tag); pf_send_tcp((*state)->rule.ptr, pd->af, &sk->addr[pd->sidx], &sk->addr[pd->didx], sk->port[pd->sidx], sk->port[pd->didx], (*state)->src.seqhi + 1, (*state)->src.seqlo + 1, TH_ACK, (*state)->dst.max_win, 0, 0, 1, 0); (*state)->src.seqdiff = (*state)->dst.seqhi - (*state)->src.seqlo; (*state)->dst.seqdiff = (*state)->src.seqhi - (*state)->dst.seqlo; (*state)->src.seqhi = (*state)->src.seqlo + (*state)->dst.max_win; (*state)->dst.seqhi = (*state)->dst.seqlo + (*state)->src.max_win; (*state)->src.wscale = (*state)->dst.wscale = 0; pf_set_protostate(*state, PF_PEER_BOTH, TCPS_ESTABLISHED); REASON_SET(reason, PFRES_SYNPROXY); return (PF_SYNPROXY_DROP); } } return (PF_PASS); } static int pf_test_state_tcp(struct pf_kstate **state, int direction, struct pfi_kkif *kif, struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason) { struct pf_state_key_cmp key; struct tcphdr *th = &pd->hdr.tcp; int copyback = 0; int action; struct pf_state_peer *src, *dst; bzero(&key, sizeof(key)); key.af = pd->af; key.proto = IPPROTO_TCP; if (direction == PF_IN) { /* wire side, straight */ PF_ACPY(&key.addr[0], pd->src, key.af); PF_ACPY(&key.addr[1], pd->dst, key.af); key.port[0] = th->th_sport; key.port[1] = th->th_dport; } else { /* stack side, reverse */ PF_ACPY(&key.addr[1], pd->src, key.af); PF_ACPY(&key.addr[0], pd->dst, key.af); key.port[1] = th->th_sport; key.port[0] = th->th_dport; } STATE_LOOKUP(kif, &key, direction, *state, pd); if (direction == (*state)->direction) { src = &(*state)->src; dst = &(*state)->dst; } else { src = &(*state)->dst; dst = &(*state)->src; } if ((action = pf_synproxy(pd, state, reason)) != PF_PASS) return (action); if (((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN) && dst->state >= TCPS_FIN_WAIT_2 && src->state >= TCPS_FIN_WAIT_2) { if (V_pf_status.debug >= PF_DEBUG_MISC) { printf("pf: state reuse "); pf_print_state(*state); pf_print_flags(th->th_flags); printf("\n"); } /* XXX make sure it's the same direction ?? */ pf_set_protostate(*state, PF_PEER_BOTH, TCPS_CLOSED); pf_unlink_state(*state); *state = NULL; return (PF_DROP); } if ((*state)->state_flags & PFSTATE_SLOPPY) { if (pf_tcp_track_sloppy(state, pd, reason) == PF_DROP) return (PF_DROP); } else { if (pf_tcp_track_full(state, kif, m, off, pd, reason, ©back) == PF_DROP) return (PF_DROP); } /* translate source/destination address, if necessary */ if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { struct pf_state_key *nk = (*state)->key[pd->didx]; if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || nk->port[pd->sidx] != th->th_sport) pf_change_ap(m, pd->src, &th->th_sport, pd->ip_sum, &th->th_sum, &nk->addr[pd->sidx], nk->port[pd->sidx], 0, pd->af); if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || nk->port[pd->didx] != th->th_dport) pf_change_ap(m, pd->dst, &th->th_dport, pd->ip_sum, &th->th_sum, &nk->addr[pd->didx], nk->port[pd->didx], 0, pd->af); copyback = 1; } /* Copyback sequence modulation or stateful scrub changes if needed */ if (copyback) m_copyback(m, off, sizeof(*th), (caddr_t)th); return (PF_PASS); } static int pf_test_state_udp(struct pf_kstate **state, int direction, struct pfi_kkif *kif, struct mbuf *m, int off, void *h, struct pf_pdesc *pd) { struct pf_state_peer *src, *dst; struct pf_state_key_cmp key; struct udphdr *uh = &pd->hdr.udp; uint8_t psrc, pdst; bzero(&key, sizeof(key)); key.af = pd->af; key.proto = IPPROTO_UDP; if (direction == PF_IN) { /* wire side, straight */ PF_ACPY(&key.addr[0], pd->src, key.af); PF_ACPY(&key.addr[1], pd->dst, key.af); key.port[0] = uh->uh_sport; key.port[1] = uh->uh_dport; } else { /* stack side, reverse */ PF_ACPY(&key.addr[1], pd->src, key.af); PF_ACPY(&key.addr[0], pd->dst, key.af); key.port[1] = uh->uh_sport; key.port[0] = uh->uh_dport; } STATE_LOOKUP(kif, &key, direction, *state, pd); if (direction == (*state)->direction) { src = &(*state)->src; dst = &(*state)->dst; psrc = PF_PEER_SRC; pdst = PF_PEER_DST; } else { src = &(*state)->dst; dst = &(*state)->src; psrc = PF_PEER_DST; pdst = PF_PEER_SRC; } /* update states */ if (src->state < PFUDPS_SINGLE) pf_set_protostate(*state, psrc, PFUDPS_SINGLE); if (dst->state == PFUDPS_SINGLE) pf_set_protostate(*state, pdst, PFUDPS_MULTIPLE); /* update expire time */ (*state)->expire = time_uptime; if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE) (*state)->timeout = PFTM_UDP_MULTIPLE; else (*state)->timeout = PFTM_UDP_SINGLE; /* translate source/destination address, if necessary */ if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { struct pf_state_key *nk = (*state)->key[pd->didx]; if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || nk->port[pd->sidx] != uh->uh_sport) pf_change_ap(m, pd->src, &uh->uh_sport, pd->ip_sum, &uh->uh_sum, &nk->addr[pd->sidx], nk->port[pd->sidx], 1, pd->af); if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || nk->port[pd->didx] != uh->uh_dport) pf_change_ap(m, pd->dst, &uh->uh_dport, pd->ip_sum, &uh->uh_sum, &nk->addr[pd->didx], nk->port[pd->didx], 1, pd->af); m_copyback(m, off, sizeof(*uh), (caddr_t)uh); } return (PF_PASS); } static int pf_test_state_icmp(struct pf_kstate **state, int direction, struct pfi_kkif *kif, struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason) { struct pf_addr *saddr = pd->src, *daddr = pd->dst; u_int16_t icmpid = 0, *icmpsum; u_int8_t icmptype, icmpcode; int state_icmp = 0; struct pf_state_key_cmp key; bzero(&key, sizeof(key)); switch (pd->proto) { #ifdef INET case IPPROTO_ICMP: icmptype = pd->hdr.icmp.icmp_type; icmpcode = pd->hdr.icmp.icmp_code; icmpid = pd->hdr.icmp.icmp_id; icmpsum = &pd->hdr.icmp.icmp_cksum; if (icmptype == ICMP_UNREACH || icmptype == ICMP_SOURCEQUENCH || icmptype == ICMP_REDIRECT || icmptype == ICMP_TIMXCEED || icmptype == ICMP_PARAMPROB) state_icmp++; break; #endif /* INET */ #ifdef INET6 case IPPROTO_ICMPV6: icmptype = pd->hdr.icmp6.icmp6_type; icmpcode = pd->hdr.icmp6.icmp6_code; icmpid = pd->hdr.icmp6.icmp6_id; icmpsum = &pd->hdr.icmp6.icmp6_cksum; if (icmptype == ICMP6_DST_UNREACH || icmptype == ICMP6_PACKET_TOO_BIG || icmptype == ICMP6_TIME_EXCEEDED || icmptype == ICMP6_PARAM_PROB) state_icmp++; break; #endif /* INET6 */ } if (!state_icmp) { /* * ICMP query/reply message not related to a TCP/UDP packet. * Search for an ICMP state. */ key.af = pd->af; key.proto = pd->proto; key.port[0] = key.port[1] = icmpid; if (direction == PF_IN) { /* wire side, straight */ PF_ACPY(&key.addr[0], pd->src, key.af); PF_ACPY(&key.addr[1], pd->dst, key.af); } else { /* stack side, reverse */ PF_ACPY(&key.addr[1], pd->src, key.af); PF_ACPY(&key.addr[0], pd->dst, key.af); } STATE_LOOKUP(kif, &key, direction, *state, pd); (*state)->expire = time_uptime; (*state)->timeout = PFTM_ICMP_ERROR_REPLY; /* translate source/destination address, if necessary */ if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { struct pf_state_key *nk = (*state)->key[pd->didx]; switch (pd->af) { #ifdef INET case AF_INET: if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) pf_change_a(&saddr->v4.s_addr, pd->ip_sum, nk->addr[pd->sidx].v4.s_addr, 0); if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) pf_change_a(&daddr->v4.s_addr, pd->ip_sum, nk->addr[pd->didx].v4.s_addr, 0); if (nk->port[0] != pd->hdr.icmp.icmp_id) { pd->hdr.icmp.icmp_cksum = pf_cksum_fixup( pd->hdr.icmp.icmp_cksum, icmpid, nk->port[pd->sidx], 0); pd->hdr.icmp.icmp_id = nk->port[pd->sidx]; } m_copyback(m, off, ICMP_MINLEN, (caddr_t )&pd->hdr.icmp); break; #endif /* INET */ #ifdef INET6 case AF_INET6: if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET6)) pf_change_a6(saddr, &pd->hdr.icmp6.icmp6_cksum, &nk->addr[pd->sidx], 0); if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET6)) pf_change_a6(daddr, &pd->hdr.icmp6.icmp6_cksum, &nk->addr[pd->didx], 0); m_copyback(m, off, sizeof(struct icmp6_hdr), (caddr_t )&pd->hdr.icmp6); break; #endif /* INET6 */ } } return (PF_PASS); } else { /* * ICMP error message in response to a TCP/UDP packet. * Extract the inner TCP/UDP header and search for that state. */ struct pf_pdesc pd2; bzero(&pd2, sizeof pd2); #ifdef INET struct ip h2; #endif /* INET */ #ifdef INET6 struct ip6_hdr h2_6; int terminal = 0; #endif /* INET6 */ int ipoff2 = 0; int off2 = 0; pd2.af = pd->af; /* Payload packet is from the opposite direction. */ pd2.sidx = (direction == PF_IN) ? 1 : 0; pd2.didx = (direction == PF_IN) ? 0 : 1; switch (pd->af) { #ifdef INET case AF_INET: /* offset of h2 in mbuf chain */ ipoff2 = off + ICMP_MINLEN; if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2), NULL, reason, pd2.af)) { DPFPRINTF(PF_DEBUG_MISC, ("pf: ICMP error message too short " "(ip)\n")); return (PF_DROP); } /* * ICMP error messages don't refer to non-first * fragments */ if (h2.ip_off & htons(IP_OFFMASK)) { REASON_SET(reason, PFRES_FRAG); return (PF_DROP); } /* offset of protocol header that follows h2 */ off2 = ipoff2 + (h2.ip_hl << 2); pd2.proto = h2.ip_p; pd2.src = (struct pf_addr *)&h2.ip_src; pd2.dst = (struct pf_addr *)&h2.ip_dst; pd2.ip_sum = &h2.ip_sum; break; #endif /* INET */ #ifdef INET6 case AF_INET6: ipoff2 = off + sizeof(struct icmp6_hdr); if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6), NULL, reason, pd2.af)) { DPFPRINTF(PF_DEBUG_MISC, ("pf: ICMP error message too short " "(ip6)\n")); return (PF_DROP); } pd2.proto = h2_6.ip6_nxt; pd2.src = (struct pf_addr *)&h2_6.ip6_src; pd2.dst = (struct pf_addr *)&h2_6.ip6_dst; pd2.ip_sum = NULL; off2 = ipoff2 + sizeof(h2_6); do { switch (pd2.proto) { case IPPROTO_FRAGMENT: /* * ICMPv6 error messages for * non-first fragments */ REASON_SET(reason, PFRES_FRAG); return (PF_DROP); case IPPROTO_AH: case IPPROTO_HOPOPTS: case IPPROTO_ROUTING: case IPPROTO_DSTOPTS: { /* get next header and header length */ struct ip6_ext opt6; if (!pf_pull_hdr(m, off2, &opt6, sizeof(opt6), NULL, reason, pd2.af)) { DPFPRINTF(PF_DEBUG_MISC, ("pf: ICMPv6 short opt\n")); return (PF_DROP); } if (pd2.proto == IPPROTO_AH) off2 += (opt6.ip6e_len + 2) * 4; else off2 += (opt6.ip6e_len + 1) * 8; pd2.proto = opt6.ip6e_nxt; /* goto the next header */ break; } default: terminal++; break; } } while (!terminal); break; #endif /* INET6 */ } if (PF_ANEQ(pd->dst, pd2.src, pd->af)) { if (V_pf_status.debug >= PF_DEBUG_MISC) { printf("pf: BAD ICMP %d:%d outer dst: ", icmptype, icmpcode); pf_print_host(pd->src, 0, pd->af); printf(" -> "); pf_print_host(pd->dst, 0, pd->af); printf(" inner src: "); pf_print_host(pd2.src, 0, pd2.af); printf(" -> "); pf_print_host(pd2.dst, 0, pd2.af); printf("\n"); } REASON_SET(reason, PFRES_BADSTATE); return (PF_DROP); } switch (pd2.proto) { case IPPROTO_TCP: { struct tcphdr th; u_int32_t seq; struct pf_state_peer *src, *dst; u_int8_t dws; int copyback = 0; /* * Only the first 8 bytes of the TCP header can be * expected. Don't access any TCP header fields after * th_seq, an ackskew test is not possible. */ if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason, pd2.af)) { DPFPRINTF(PF_DEBUG_MISC, ("pf: ICMP error message too short " "(tcp)\n")); return (PF_DROP); } key.af = pd2.af; key.proto = IPPROTO_TCP; PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); key.port[pd2.sidx] = th.th_sport; key.port[pd2.didx] = th.th_dport; STATE_LOOKUP(kif, &key, direction, *state, pd); if (direction == (*state)->direction) { src = &(*state)->dst; dst = &(*state)->src; } else { src = &(*state)->src; dst = &(*state)->dst; } if (src->wscale && dst->wscale) dws = dst->wscale & PF_WSCALE_MASK; else dws = 0; /* Demodulate sequence number */ seq = ntohl(th.th_seq) - src->seqdiff; if (src->seqdiff) { pf_change_a(&th.th_seq, icmpsum, htonl(seq), 0); copyback = 1; } if (!((*state)->state_flags & PFSTATE_SLOPPY) && (!SEQ_GEQ(src->seqhi, seq) || !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)))) { if (V_pf_status.debug >= PF_DEBUG_MISC) { printf("pf: BAD ICMP %d:%d ", icmptype, icmpcode); pf_print_host(pd->src, 0, pd->af); printf(" -> "); pf_print_host(pd->dst, 0, pd->af); printf(" state: "); pf_print_state(*state); printf(" seq=%u\n", seq); } REASON_SET(reason, PFRES_BADSTATE); return (PF_DROP); } else { if (V_pf_status.debug >= PF_DEBUG_MISC) { printf("pf: OK ICMP %d:%d ", icmptype, icmpcode); pf_print_host(pd->src, 0, pd->af); printf(" -> "); pf_print_host(pd->dst, 0, pd->af); printf(" state: "); pf_print_state(*state); printf(" seq=%u\n", seq); } } /* translate source/destination address, if necessary */ if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { struct pf_state_key *nk = (*state)->key[pd->didx]; if (PF_ANEQ(pd2.src, &nk->addr[pd2.sidx], pd2.af) || nk->port[pd2.sidx] != th.th_sport) pf_change_icmp(pd2.src, &th.th_sport, daddr, &nk->addr[pd2.sidx], nk->port[pd2.sidx], NULL, pd2.ip_sum, icmpsum, pd->ip_sum, 0, pd2.af); if (PF_ANEQ(pd2.dst, &nk->addr[pd2.didx], pd2.af) || nk->port[pd2.didx] != th.th_dport) pf_change_icmp(pd2.dst, &th.th_dport, saddr, &nk->addr[pd2.didx], nk->port[pd2.didx], NULL, pd2.ip_sum, icmpsum, pd->ip_sum, 0, pd2.af); copyback = 1; } if (copyback) { switch (pd2.af) { #ifdef INET case AF_INET: m_copyback(m, off, ICMP_MINLEN, (caddr_t )&pd->hdr.icmp); m_copyback(m, ipoff2, sizeof(h2), (caddr_t )&h2); break; #endif /* INET */ #ifdef INET6 case AF_INET6: m_copyback(m, off, sizeof(struct icmp6_hdr), (caddr_t )&pd->hdr.icmp6); m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t )&h2_6); break; #endif /* INET6 */ } m_copyback(m, off2, 8, (caddr_t)&th); } return (PF_PASS); break; } case IPPROTO_UDP: { struct udphdr uh; if (!pf_pull_hdr(m, off2, &uh, sizeof(uh), NULL, reason, pd2.af)) { DPFPRINTF(PF_DEBUG_MISC, ("pf: ICMP error message too short " "(udp)\n")); return (PF_DROP); } key.af = pd2.af; key.proto = IPPROTO_UDP; PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); key.port[pd2.sidx] = uh.uh_sport; key.port[pd2.didx] = uh.uh_dport; STATE_LOOKUP(kif, &key, direction, *state, pd); /* translate source/destination address, if necessary */ if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { struct pf_state_key *nk = (*state)->key[pd->didx]; if (PF_ANEQ(pd2.src, &nk->addr[pd2.sidx], pd2.af) || nk->port[pd2.sidx] != uh.uh_sport) pf_change_icmp(pd2.src, &uh.uh_sport, daddr, &nk->addr[pd2.sidx], nk->port[pd2.sidx], &uh.uh_sum, pd2.ip_sum, icmpsum, pd->ip_sum, 1, pd2.af); if (PF_ANEQ(pd2.dst, &nk->addr[pd2.didx], pd2.af) || nk->port[pd2.didx] != uh.uh_dport) pf_change_icmp(pd2.dst, &uh.uh_dport, saddr, &nk->addr[pd2.didx], nk->port[pd2.didx], &uh.uh_sum, pd2.ip_sum, icmpsum, pd->ip_sum, 1, pd2.af); switch (pd2.af) { #ifdef INET case AF_INET: m_copyback(m, off, ICMP_MINLEN, (caddr_t )&pd->hdr.icmp); m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); break; #endif /* INET */ #ifdef INET6 case AF_INET6: m_copyback(m, off, sizeof(struct icmp6_hdr), (caddr_t )&pd->hdr.icmp6); m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t )&h2_6); break; #endif /* INET6 */ } m_copyback(m, off2, sizeof(uh), (caddr_t)&uh); } return (PF_PASS); break; } #ifdef INET case IPPROTO_ICMP: { struct icmp iih; if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN, NULL, reason, pd2.af)) { DPFPRINTF(PF_DEBUG_MISC, ("pf: ICMP error message too short i" "(icmp)\n")); return (PF_DROP); } key.af = pd2.af; key.proto = IPPROTO_ICMP; PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); key.port[0] = key.port[1] = iih.icmp_id; STATE_LOOKUP(kif, &key, direction, *state, pd); /* translate source/destination address, if necessary */ if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { struct pf_state_key *nk = (*state)->key[pd->didx]; if (PF_ANEQ(pd2.src, &nk->addr[pd2.sidx], pd2.af) || nk->port[pd2.sidx] != iih.icmp_id) pf_change_icmp(pd2.src, &iih.icmp_id, daddr, &nk->addr[pd2.sidx], nk->port[pd2.sidx], NULL, pd2.ip_sum, icmpsum, pd->ip_sum, 0, AF_INET); if (PF_ANEQ(pd2.dst, &nk->addr[pd2.didx], pd2.af) || nk->port[pd2.didx] != iih.icmp_id) pf_change_icmp(pd2.dst, &iih.icmp_id, saddr, &nk->addr[pd2.didx], nk->port[pd2.didx], NULL, pd2.ip_sum, icmpsum, pd->ip_sum, 0, AF_INET); m_copyback(m, off, ICMP_MINLEN, (caddr_t)&pd->hdr.icmp); m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih); } return (PF_PASS); break; } #endif /* INET */ #ifdef INET6 case IPPROTO_ICMPV6: { struct icmp6_hdr iih; if (!pf_pull_hdr(m, off2, &iih, sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) { DPFPRINTF(PF_DEBUG_MISC, ("pf: ICMP error message too short " "(icmp6)\n")); return (PF_DROP); } key.af = pd2.af; key.proto = IPPROTO_ICMPV6; PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); key.port[0] = key.port[1] = iih.icmp6_id; STATE_LOOKUP(kif, &key, direction, *state, pd); /* translate source/destination address, if necessary */ if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { struct pf_state_key *nk = (*state)->key[pd->didx]; if (PF_ANEQ(pd2.src, &nk->addr[pd2.sidx], pd2.af) || nk->port[pd2.sidx] != iih.icmp6_id) pf_change_icmp(pd2.src, &iih.icmp6_id, daddr, &nk->addr[pd2.sidx], nk->port[pd2.sidx], NULL, pd2.ip_sum, icmpsum, pd->ip_sum, 0, AF_INET6); if (PF_ANEQ(pd2.dst, &nk->addr[pd2.didx], pd2.af) || nk->port[pd2.didx] != iih.icmp6_id) pf_change_icmp(pd2.dst, &iih.icmp6_id, saddr, &nk->addr[pd2.didx], nk->port[pd2.didx], NULL, pd2.ip_sum, icmpsum, pd->ip_sum, 0, AF_INET6); m_copyback(m, off, sizeof(struct icmp6_hdr), (caddr_t)&pd->hdr.icmp6); m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6); m_copyback(m, off2, sizeof(struct icmp6_hdr), (caddr_t)&iih); } return (PF_PASS); break; } #endif /* INET6 */ default: { key.af = pd2.af; key.proto = pd2.proto; PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); key.port[0] = key.port[1] = 0; STATE_LOOKUP(kif, &key, direction, *state, pd); /* translate source/destination address, if necessary */ if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { struct pf_state_key *nk = (*state)->key[pd->didx]; if (PF_ANEQ(pd2.src, &nk->addr[pd2.sidx], pd2.af)) pf_change_icmp(pd2.src, NULL, daddr, &nk->addr[pd2.sidx], 0, NULL, pd2.ip_sum, icmpsum, pd->ip_sum, 0, pd2.af); if (PF_ANEQ(pd2.dst, &nk->addr[pd2.didx], pd2.af)) pf_change_icmp(pd2.dst, NULL, saddr, &nk->addr[pd2.didx], 0, NULL, pd2.ip_sum, icmpsum, pd->ip_sum, 0, pd2.af); switch (pd2.af) { #ifdef INET case AF_INET: m_copyback(m, off, ICMP_MINLEN, (caddr_t)&pd->hdr.icmp); m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); break; #endif /* INET */ #ifdef INET6 case AF_INET6: m_copyback(m, off, sizeof(struct icmp6_hdr), (caddr_t )&pd->hdr.icmp6); m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t )&h2_6); break; #endif /* INET6 */ } } return (PF_PASS); break; } } } } static int pf_test_state_other(struct pf_kstate **state, int direction, struct pfi_kkif *kif, struct mbuf *m, struct pf_pdesc *pd) { struct pf_state_peer *src, *dst; struct pf_state_key_cmp key; uint8_t psrc, pdst; bzero(&key, sizeof(key)); key.af = pd->af; key.proto = pd->proto; if (direction == PF_IN) { PF_ACPY(&key.addr[0], pd->src, key.af); PF_ACPY(&key.addr[1], pd->dst, key.af); key.port[0] = key.port[1] = 0; } else { PF_ACPY(&key.addr[1], pd->src, key.af); PF_ACPY(&key.addr[0], pd->dst, key.af); key.port[1] = key.port[0] = 0; } STATE_LOOKUP(kif, &key, direction, *state, pd); if (direction == (*state)->direction) { src = &(*state)->src; dst = &(*state)->dst; psrc = PF_PEER_SRC; pdst = PF_PEER_DST; } else { src = &(*state)->dst; dst = &(*state)->src; psrc = PF_PEER_DST; pdst = PF_PEER_SRC; } /* update states */ if (src->state < PFOTHERS_SINGLE) pf_set_protostate(*state, psrc, PFOTHERS_SINGLE); if (dst->state == PFOTHERS_SINGLE) pf_set_protostate(*state, pdst, PFOTHERS_MULTIPLE); /* update expire time */ (*state)->expire = time_uptime; if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE) (*state)->timeout = PFTM_OTHER_MULTIPLE; else (*state)->timeout = PFTM_OTHER_SINGLE; /* translate source/destination address, if necessary */ if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { struct pf_state_key *nk = (*state)->key[pd->didx]; KASSERT(nk, ("%s: nk is null", __func__)); KASSERT(pd, ("%s: pd is null", __func__)); KASSERT(pd->src, ("%s: pd->src is null", __func__)); KASSERT(pd->dst, ("%s: pd->dst is null", __func__)); switch (pd->af) { #ifdef INET case AF_INET: if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) pf_change_a(&pd->src->v4.s_addr, pd->ip_sum, nk->addr[pd->sidx].v4.s_addr, 0); if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) pf_change_a(&pd->dst->v4.s_addr, pd->ip_sum, nk->addr[pd->didx].v4.s_addr, 0); break; #endif /* INET */ #ifdef INET6 case AF_INET6: if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) PF_ACPY(pd->src, &nk->addr[pd->sidx], pd->af); if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) PF_ACPY(pd->dst, &nk->addr[pd->didx], pd->af); #endif /* INET6 */ } } return (PF_PASS); } /* * ipoff and off are measured from the start of the mbuf chain. * h must be at "ipoff" on the mbuf chain. */ void * pf_pull_hdr(struct mbuf *m, int off, void *p, int len, u_short *actionp, u_short *reasonp, sa_family_t af) { switch (af) { #ifdef INET case AF_INET: { struct ip *h = mtod(m, struct ip *); u_int16_t fragoff = (ntohs(h->ip_off) & IP_OFFMASK) << 3; if (fragoff) { if (fragoff >= len) ACTION_SET(actionp, PF_PASS); else { ACTION_SET(actionp, PF_DROP); REASON_SET(reasonp, PFRES_FRAG); } return (NULL); } if (m->m_pkthdr.len < off + len || ntohs(h->ip_len) < off + len) { ACTION_SET(actionp, PF_DROP); REASON_SET(reasonp, PFRES_SHORT); return (NULL); } break; } #endif /* INET */ #ifdef INET6 case AF_INET6: { struct ip6_hdr *h = mtod(m, struct ip6_hdr *); if (m->m_pkthdr.len < off + len || (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) < (unsigned)(off + len)) { ACTION_SET(actionp, PF_DROP); REASON_SET(reasonp, PFRES_SHORT); return (NULL); } break; } #endif /* INET6 */ } m_copydata(m, off, len, p); return (p); } int pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kkif *kif, int rtableid) { struct ifnet *ifp; /* * Skip check for addresses with embedded interface scope, * as they would always match anyway. */ if (af == AF_INET6 && IN6_IS_SCOPE_EMBED(&addr->v6)) return (1); if (af != AF_INET && af != AF_INET6) return (0); /* Skip checks for ipsec interfaces */ if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC) return (1); ifp = (kif != NULL) ? kif->pfik_ifp : NULL; switch (af) { #ifdef INET6 case AF_INET6: return (fib6_check_urpf(rtableid, &addr->v6, 0, NHR_NONE, ifp)); #endif #ifdef INET case AF_INET: return (fib4_check_urpf(rtableid, addr->v4, 0, NHR_NONE, ifp)); #endif } return (0); } #ifdef INET static void pf_route(struct mbuf **m, struct pf_krule *r, int dir, struct ifnet *oifp, struct pf_kstate *s, struct pf_pdesc *pd, struct inpcb *inp) { struct mbuf *m0, *m1, *md; struct sockaddr_in dst; struct ip *ip; struct ifnet *ifp = NULL; struct pf_addr naddr; struct pf_ksrc_node *sn = NULL; int error = 0; uint16_t ip_len, ip_off; KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__)); KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: invalid direction", __func__)); if ((pd->pf_mtag == NULL && ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) || pd->pf_mtag->routed++ > 3) { m0 = *m; *m = NULL; goto bad_locked; } if (r->rt == PF_DUPTO) { if ((pd->pf_mtag->flags & PF_DUPLICATED)) { if (s == NULL) { ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; } else { ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; /* If pfsync'd */ if (ifp == NULL) ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; PF_STATE_UNLOCK(s); } if (ifp == oifp) { /* When the 2nd interface is not skipped */ return; } else { m0 = *m; *m = NULL; goto bad; } } else { pd->pf_mtag->flags |= PF_DUPLICATED; if (((m0 = m_dup(*m, M_NOWAIT)) == NULL)) { if (s) PF_STATE_UNLOCK(s); return; } } } else { if ((r->rt == PF_REPLYTO) == (r->direction == dir)) { pf_dummynet(pd, dir, s, r, m); if (s) PF_STATE_UNLOCK(s); return; } m0 = *m; } ip = mtod(m0, struct ip *); bzero(&dst, sizeof(dst)); dst.sin_family = AF_INET; dst.sin_len = sizeof(dst); dst.sin_addr = ip->ip_dst; bzero(&naddr, sizeof(naddr)); if (s == NULL) { if (TAILQ_EMPTY(&r->rpool.list)) { DPFPRINTF(PF_DEBUG_URGENT, ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__)); goto bad_locked; } pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src, &naddr, NULL, &sn); if (!PF_AZERO(&naddr, AF_INET)) dst.sin_addr.s_addr = naddr.v4.s_addr; ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; } else { if (!PF_AZERO(&s->rt_addr, AF_INET)) dst.sin_addr.s_addr = s->rt_addr.v4.s_addr; ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; PF_STATE_UNLOCK(s); } /* If pfsync'd */ if (ifp == NULL) ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; if (ifp == NULL) goto bad; if (dir == PF_IN) { if (pf_test(PF_OUT, 0, ifp, &m0, inp) != PF_PASS) goto bad; else if (m0 == NULL) goto done; if (m0->m_len < sizeof(struct ip)) { DPFPRINTF(PF_DEBUG_URGENT, ("%s: m0->m_len < sizeof(struct ip)\n", __func__)); goto bad; } ip = mtod(m0, struct ip *); } if (ifp->if_flags & IFF_LOOPBACK) m0->m_flags |= M_SKIP_FIREWALL; ip_len = ntohs(ip->ip_len); ip_off = ntohs(ip->ip_off); /* Copied from FreeBSD 10.0-CURRENT ip_output. */ m0->m_pkthdr.csum_flags |= CSUM_IP; if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA & ~ifp->if_hwassist) { in_delayed_cksum(m0); m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; } #if defined(SCTP) || defined(SCTP_SUPPORT) if (m0->m_pkthdr.csum_flags & CSUM_SCTP & ~ifp->if_hwassist) { sctp_delayed_cksum(m0, (uint32_t)(ip->ip_hl << 2)); m0->m_pkthdr.csum_flags &= ~CSUM_SCTP; } #endif /* * If small enough for interface, or the interface will take * care of the fragmentation for us, we can just send directly. */ if (ip_len <= ifp->if_mtu || (m0->m_pkthdr.csum_flags & ifp->if_hwassist & CSUM_TSO) != 0) { ip->ip_sum = 0; if (m0->m_pkthdr.csum_flags & CSUM_IP & ~ifp->if_hwassist) { ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); m0->m_pkthdr.csum_flags &= ~CSUM_IP; } m_clrprotoflags(m0); /* Avoid confusing lower layers. */ md = m0; error = pf_dummynet_route(pd, dir, s, r, ifp, sintosa(&dst), &md); if (md != NULL) error = (*ifp->if_output)(ifp, md, sintosa(&dst), NULL); goto done; } /* Balk when DF bit is set or the interface didn't support TSO. */ if ((ip_off & IP_DF) || (m0->m_pkthdr.csum_flags & CSUM_TSO)) { error = EMSGSIZE; KMOD_IPSTAT_INC(ips_cantfrag); if (r->rt != PF_DUPTO) { if (s && pd->nat_rule != NULL) PACKET_UNDO_NAT(m0, pd, (ip->ip_hl << 2) + (ip_off & IP_OFFMASK), s, dir); icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, ifp->if_mtu); goto done; } else goto bad; } error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist); if (error) goto bad; for (; m0; m0 = m1) { m1 = m0->m_nextpkt; m0->m_nextpkt = NULL; if (error == 0) { m_clrprotoflags(m0); md = m0; error = pf_dummynet_route(pd, dir, s, r, ifp, sintosa(&dst), &md); if (md != NULL) error = (*ifp->if_output)(ifp, md, sintosa(&dst), NULL); } else m_freem(m0); } if (error == 0) KMOD_IPSTAT_INC(ips_fragmented); done: if (r->rt != PF_DUPTO) *m = NULL; return; bad_locked: if (s) PF_STATE_UNLOCK(s); bad: m_freem(m0); goto done; } #endif /* INET */ #ifdef INET6 static void pf_route6(struct mbuf **m, struct pf_krule *r, int dir, struct ifnet *oifp, struct pf_kstate *s, struct pf_pdesc *pd, struct inpcb *inp) { struct mbuf *m0, *md; struct sockaddr_in6 dst; struct ip6_hdr *ip6; struct ifnet *ifp = NULL; struct pf_addr naddr; struct pf_ksrc_node *sn = NULL; KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__)); KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: invalid direction", __func__)); if ((pd->pf_mtag == NULL && ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) || pd->pf_mtag->routed++ > 3) { m0 = *m; *m = NULL; goto bad_locked; } if (r->rt == PF_DUPTO) { if ((pd->pf_mtag->flags & PF_DUPLICATED)) { if (s == NULL) { ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; } else { ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; /* If pfsync'd */ if (ifp == NULL) ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; PF_STATE_UNLOCK(s); } if (ifp == oifp) { /* When the 2nd interface is not skipped */ return; } else { m0 = *m; *m = NULL; goto bad; } } else { pd->pf_mtag->flags |= PF_DUPLICATED; if (((m0 = m_dup(*m, M_NOWAIT)) == NULL)) { if (s) PF_STATE_UNLOCK(s); return; } } } else { if ((r->rt == PF_REPLYTO) == (r->direction == dir)) { pf_dummynet(pd, dir, s, r, m); if (s) PF_STATE_UNLOCK(s); return; } m0 = *m; } ip6 = mtod(m0, struct ip6_hdr *); bzero(&dst, sizeof(dst)); dst.sin6_family = AF_INET6; dst.sin6_len = sizeof(dst); dst.sin6_addr = ip6->ip6_dst; bzero(&naddr, sizeof(naddr)); if (s == NULL) { if (TAILQ_EMPTY(&r->rpool.list)) { DPFPRINTF(PF_DEBUG_URGENT, ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__)); goto bad_locked; } pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src, &naddr, NULL, &sn); if (!PF_AZERO(&naddr, AF_INET6)) PF_ACPY((struct pf_addr *)&dst.sin6_addr, &naddr, AF_INET6); ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; } else { if (!PF_AZERO(&s->rt_addr, AF_INET6)) PF_ACPY((struct pf_addr *)&dst.sin6_addr, &s->rt_addr, AF_INET6); ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; } if (s) PF_STATE_UNLOCK(s); /* If pfsync'd */ if (ifp == NULL) ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; if (ifp == NULL) goto bad; if (dir == PF_IN) { if (pf_test6(PF_OUT, 0, ifp, &m0, inp) != PF_PASS) goto bad; else if (m0 == NULL) goto done; if (m0->m_len < sizeof(struct ip6_hdr)) { DPFPRINTF(PF_DEBUG_URGENT, ("%s: m0->m_len < sizeof(struct ip6_hdr)\n", __func__)); goto bad; } ip6 = mtod(m0, struct ip6_hdr *); } if (ifp->if_flags & IFF_LOOPBACK) m0->m_flags |= M_SKIP_FIREWALL; if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6 & ~ifp->if_hwassist) { uint32_t plen = m0->m_pkthdr.len - sizeof(*ip6); in6_delayed_cksum(m0, plen, sizeof(struct ip6_hdr)); m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6; } /* * If the packet is too large for the outgoing interface, * send back an icmp6 error. */ if (IN6_IS_SCOPE_EMBED(&dst.sin6_addr)) dst.sin6_addr.s6_addr16[1] = htons(ifp->if_index); if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) { md = m0; pf_dummynet_route(pd, dir, s, r, ifp, sintosa(&dst), &md); if (md != NULL) nd6_output_ifp(ifp, ifp, md, &dst, NULL); } else { in6_ifstat_inc(ifp, ifs6_in_toobig); if (r->rt != PF_DUPTO) { if (s && pd->nat_rule != NULL) PACKET_UNDO_NAT(m0, pd, ((caddr_t)ip6 - m0->m_data) + sizeof(struct ip6_hdr), s, dir); icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); } else goto bad; } done: if (r->rt != PF_DUPTO) *m = NULL; return; bad_locked: if (s) PF_STATE_UNLOCK(s); bad: m_freem(m0); goto done; } #endif /* INET6 */ /* * FreeBSD supports cksum offloads for the following drivers. * em(4), fxp(4), lge(4), nge(4), re(4), ti(4), txp(4), xl(4) * * CSUM_DATA_VALID | CSUM_PSEUDO_HDR : * network driver performed cksum including pseudo header, need to verify * csum_data * CSUM_DATA_VALID : * network driver performed cksum, needs to additional pseudo header * cksum computation with partial csum_data(i.e. lack of H/W support for * pseudo header, for instance sk(4) and possibly gem(4)) * * After validating the cksum of packet, set both flag CSUM_DATA_VALID and * CSUM_PSEUDO_HDR in order to avoid recomputation of the cksum in upper * TCP/UDP layer. * Also, set csum_data to 0xffff to force cksum validation. */ static int pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, sa_family_t af) { u_int16_t sum = 0; int hw_assist = 0; struct ip *ip; if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) return (1); if (m->m_pkthdr.len < off + len) return (1); switch (p) { case IPPROTO_TCP: if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { sum = m->m_pkthdr.csum_data; } else { ip = mtod(m, struct ip *); sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, htonl((u_short)len + m->m_pkthdr.csum_data + IPPROTO_TCP)); } sum ^= 0xffff; ++hw_assist; } break; case IPPROTO_UDP: if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { sum = m->m_pkthdr.csum_data; } else { ip = mtod(m, struct ip *); sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, htonl((u_short)len + m->m_pkthdr.csum_data + IPPROTO_UDP)); } sum ^= 0xffff; ++hw_assist; } break; case IPPROTO_ICMP: #ifdef INET6 case IPPROTO_ICMPV6: #endif /* INET6 */ break; default: return (1); } if (!hw_assist) { switch (af) { case AF_INET: if (p == IPPROTO_ICMP) { if (m->m_len < off) return (1); m->m_data += off; m->m_len -= off; sum = in_cksum(m, len); m->m_data -= off; m->m_len += off; } else { if (m->m_len < sizeof(struct ip)) return (1); sum = in4_cksum(m, p, off, len); } break; #ifdef INET6 case AF_INET6: if (m->m_len < sizeof(struct ip6_hdr)) return (1); sum = in6_cksum(m, p, off, len); break; #endif /* INET6 */ default: return (1); } } if (sum) { switch (p) { case IPPROTO_TCP: { KMOD_TCPSTAT_INC(tcps_rcvbadsum); break; } case IPPROTO_UDP: { KMOD_UDPSTAT_INC(udps_badsum); break; } #ifdef INET case IPPROTO_ICMP: { KMOD_ICMPSTAT_INC(icps_checksum); break; } #endif #ifdef INET6 case IPPROTO_ICMPV6: { KMOD_ICMP6STAT_INC(icp6s_checksum); break; } #endif /* INET6 */ } return (1); } else { if (p == IPPROTO_TCP || p == IPPROTO_UDP) { m->m_pkthdr.csum_flags |= (CSUM_DATA_VALID | CSUM_PSEUDO_HDR); m->m_pkthdr.csum_data = 0xffff; } } return (0); } static bool pf_pdesc_to_dnflow(int dir, const struct pf_pdesc *pd, const struct pf_krule *r, const struct pf_kstate *s, struct ip_fw_args *dnflow) { int dndir = r->direction; if (s && dndir == PF_INOUT) { dndir = s->direction; } else if (dndir == PF_INOUT) { /* Assume primary direction. Happens when we've set dnpipe in * the ethernet level code. */ dndir = dir; } memset(dnflow, 0, sizeof(*dnflow)); if (pd->dport != NULL) dnflow->f_id.dst_port = ntohs(*pd->dport); if (pd->sport != NULL) dnflow->f_id.src_port = ntohs(*pd->sport); if (dir == PF_IN) dnflow->flags |= IPFW_ARGS_IN; else dnflow->flags |= IPFW_ARGS_OUT; if (dir != dndir && pd->act.dnrpipe) { dnflow->rule.info = pd->act.dnrpipe; } else if (dir == dndir && pd->act.dnpipe) { dnflow->rule.info = pd->act.dnpipe; } else { return (false); } dnflow->rule.info |= IPFW_IS_DUMMYNET; if (r->free_flags & PFRULE_DN_IS_PIPE || pd->act.flags & PFRULE_DN_IS_PIPE) dnflow->rule.info |= IPFW_IS_PIPE; dnflow->f_id.proto = pd->proto; dnflow->f_id.extra = dnflow->rule.info; switch (pd->af) { case AF_INET: dnflow->f_id.addr_type = 4; dnflow->f_id.src_ip = ntohl(pd->src->v4.s_addr); dnflow->f_id.dst_ip = ntohl(pd->dst->v4.s_addr); break; case AF_INET6: dnflow->flags |= IPFW_ARGS_IP6; dnflow->f_id.addr_type = 6; dnflow->f_id.src_ip6 = pd->src->v6; dnflow->f_id.dst_ip6 = pd->dst->v6; break; default: panic("Invalid AF"); break; } return (true); } int pf_test_eth(int dir, int pflags, struct ifnet *ifp, struct mbuf **m0, struct inpcb *inp) { struct pfi_kkif *kif; struct mbuf *m = *m0; M_ASSERTPKTHDR(m); MPASS(ifp->if_vnet == curvnet); NET_EPOCH_ASSERT(); if (!V_pf_status.running) return (PF_PASS); kif = (struct pfi_kkif *)ifp->if_pf_kif; if (kif == NULL) { DPFPRINTF(PF_DEBUG_URGENT, ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname)); return (PF_DROP); } if (kif->pfik_flags & PFI_IFLAG_SKIP) return (PF_PASS); if (m->m_flags & M_SKIP_FIREWALL) return (PF_PASS); /* Stateless! */ return (pf_test_eth_rule(dir, kif, m0)); } static int pf_dummynet(struct pf_pdesc *pd, int dir, struct pf_kstate *s, struct pf_krule *r, struct mbuf **m0) { return (pf_dummynet_route(pd, dir, s, r, NULL, NULL, m0)); } static int pf_dummynet_route(struct pf_pdesc *pd, int dir, struct pf_kstate *s, struct pf_krule *r, struct ifnet *ifp, struct sockaddr *sa, struct mbuf **m0) { NET_EPOCH_ASSERT(); if (s && (s->dnpipe || s->dnrpipe)) { pd->act.dnpipe = s->dnpipe; pd->act.dnrpipe = s->dnrpipe; pd->act.flags = s->state_flags; } else if (r->dnpipe || r->dnrpipe) { pd->act.dnpipe = r->dnpipe; pd->act.dnrpipe = r->dnrpipe; pd->act.flags = r->free_flags; } if (pd->act.dnpipe || pd->act.dnrpipe) { struct ip_fw_args dnflow; if (ip_dn_io_ptr == NULL) { m_freem(*m0); *m0 = NULL; return (ENOMEM); } if (pd->pf_mtag == NULL && ((pd->pf_mtag = pf_get_mtag(*m0)) == NULL)) { m_freem(*m0); *m0 = NULL; return (ENOMEM); } if (ifp != NULL) { pd->pf_mtag->flags |= PF_TAG_ROUTE_TO; pd->pf_mtag->if_index = ifp->if_index; pd->pf_mtag->if_idxgen = ifp->if_idxgen; MPASS(sa != NULL); if (pd->af == AF_INET) memcpy(&pd->pf_mtag->dst, sa, sizeof(struct sockaddr_in)); else memcpy(&pd->pf_mtag->dst, sa, sizeof(struct sockaddr_in6)); } if (pf_pdesc_to_dnflow(dir, pd, r, s, &dnflow)) { pd->pf_mtag->flags |= PF_TAG_DUMMYNET; ip_dn_io_ptr(m0, &dnflow); if (*m0 != NULL) pd->pf_mtag->flags &= ~PF_TAG_DUMMYNET; } } return (0); } #ifdef INET int pf_test(int dir, int pflags, struct ifnet *ifp, struct mbuf **m0, struct inpcb *inp) { struct pfi_kkif *kif; u_short action, reason = 0, log = 0; struct mbuf *m = *m0; struct ip *h = NULL; struct m_tag *ipfwtag; struct pf_krule *a = NULL, *r = &V_pf_default_rule, *tr, *nr; struct pf_kstate *s = NULL; struct pf_kruleset *ruleset = NULL; struct pf_pdesc pd; int off, dirndx, pqid = 0; PF_RULES_RLOCK_TRACKER; KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: bad direction %d\n", __func__, dir)); M_ASSERTPKTHDR(m); if (!V_pf_status.running) return (PF_PASS); PF_RULES_RLOCK(); kif = (struct pfi_kkif *)ifp->if_pf_kif; if (__predict_false(kif == NULL)) { DPFPRINTF(PF_DEBUG_URGENT, ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname)); PF_RULES_RUNLOCK(); return (PF_DROP); } if (kif->pfik_flags & PFI_IFLAG_SKIP) { PF_RULES_RUNLOCK(); return (PF_PASS); } if (m->m_flags & M_SKIP_FIREWALL) { PF_RULES_RUNLOCK(); return (PF_PASS); } memset(&pd, 0, sizeof(pd)); pd.pf_mtag = pf_find_mtag(m); if (pd.pf_mtag != NULL && (pd.pf_mtag->flags & PF_TAG_ROUTE_TO)) { pd.pf_mtag->flags &= ~PF_TAG_ROUTE_TO; ifp = ifnet_byindexgen(pd.pf_mtag->if_index, pd.pf_mtag->if_idxgen); if (ifp == NULL || ifp->if_flags & IFF_DYING) { PF_RULES_RUNLOCK(); m_freem(*m0); *m0 = NULL; return (PF_PASS); } PF_RULES_RUNLOCK(); (ifp->if_output)(ifp, m, sintosa(&pd.pf_mtag->dst), NULL); *m0 = NULL; return (PF_PASS); } if (pd.pf_mtag && pd.pf_mtag->dnpipe) { pd.act.dnpipe = pd.pf_mtag->dnpipe; pd.act.flags = pd.pf_mtag->dnflags; } if (ip_dn_io_ptr != NULL && pd.pf_mtag != NULL && pd.pf_mtag->flags & PF_TAG_DUMMYNET) { /* Dummynet re-injects packets after they've * completed their delay. We've already * processed them, so pass unconditionally. */ /* But only once. We may see the packet multiple times (e.g. * PFIL_IN/PFIL_OUT). */ pd.pf_mtag->flags &= ~PF_TAG_DUMMYNET; PF_RULES_RUNLOCK(); return (PF_PASS); } if (__predict_false(ip_divert_ptr != NULL) && ((ipfwtag = m_tag_locate(m, MTAG_IPFW_RULE, 0, NULL)) != NULL)) { struct ipfw_rule_ref *rr = (struct ipfw_rule_ref *)(ipfwtag+1); if (rr->info & IPFW_IS_DIVERT && rr->rulenum == 0) { if (pd.pf_mtag == NULL && ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { action = PF_DROP; goto done; } pd.pf_mtag->flags |= PF_PACKET_LOOPED; m_tag_delete(m, ipfwtag); } if (pd.pf_mtag && pd.pf_mtag->flags & PF_FASTFWD_OURS_PRESENT) { m->m_flags |= M_FASTFWD_OURS; pd.pf_mtag->flags &= ~PF_FASTFWD_OURS_PRESENT; } } else if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) { /* We do IP header normalization and packet reassembly here */ action = PF_DROP; goto done; } m = *m0; /* pf_normalize messes with m0 */ h = mtod(m, struct ip *); off = h->ip_hl << 2; if (off < (int)sizeof(struct ip)) { action = PF_DROP; REASON_SET(&reason, PFRES_SHORT); log = 1; goto done; } pd.src = (struct pf_addr *)&h->ip_src; pd.dst = (struct pf_addr *)&h->ip_dst; pd.sport = pd.dport = NULL; pd.ip_sum = &h->ip_sum; pd.proto_sum = NULL; pd.proto = h->ip_p; pd.dir = dir; pd.sidx = (dir == PF_IN) ? 0 : 1; pd.didx = (dir == PF_IN) ? 1 : 0; pd.af = AF_INET; pd.tos = h->ip_tos & ~IPTOS_ECN_MASK; pd.tot_len = ntohs(h->ip_len); /* handle fragments that didn't get reassembled by normalization */ if (h->ip_off & htons(IP_MF | IP_OFFMASK)) { action = pf_test_fragment(&r, dir, kif, m, h, &pd, &a, &ruleset); goto done; } switch (h->ip_p) { case IPPROTO_TCP: { if (!pf_pull_hdr(m, off, &pd.hdr.tcp, sizeof(pd.hdr.tcp), &action, &reason, AF_INET)) { log = action != PF_PASS; goto done; } pd.p_len = pd.tot_len - off - (pd.hdr.tcp.th_off << 2); pd.sport = &pd.hdr.tcp.th_sport; pd.dport = &pd.hdr.tcp.th_dport; /* Respond to SYN with a syncookie. */ if ((pd.hdr.tcp.th_flags & (TH_SYN|TH_ACK|TH_RST)) == TH_SYN && pd.dir == PF_IN && pf_synflood_check(&pd)) { pf_syncookie_send(m, off, &pd); action = PF_DROP; break; } if ((pd.hdr.tcp.th_flags & TH_ACK) && pd.p_len == 0) pqid = 1; action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); if (action == PF_DROP) goto done; action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, &reason); if (action == PF_PASS) { if (V_pfsync_update_state_ptr != NULL) V_pfsync_update_state_ptr(s); r = s->rule.ptr; a = s->anchor.ptr; log = s->log; } else if (s == NULL) { /* Validate remote SYN|ACK, re-create original SYN if * valid. */ if ((pd.hdr.tcp.th_flags & (TH_SYN|TH_ACK|TH_RST)) == TH_ACK && pf_syncookie_validate(&pd) && pd.dir == PF_IN) { struct mbuf *msyn; msyn = pf_syncookie_recreate_syn(h->ip_ttl, off,&pd); if (msyn == NULL) { action = PF_DROP; break; } action = pf_test(dir, pflags, ifp, &msyn, inp); m_freem(msyn); if (action == PF_PASS) { action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, &reason); if (action != PF_PASS || s == NULL) { action = PF_DROP; break; } s->src.seqhi = ntohl(pd.hdr.tcp.th_ack) - 1; s->src.seqlo = ntohl(pd.hdr.tcp.th_seq) - 1; pf_set_protostate(s, PF_PEER_SRC, PF_TCPS_PROXY_DST); action = pf_synproxy(&pd, &s, &reason); if (action != PF_PASS) break; } break; } else { action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, &a, &ruleset, inp); } } break; } case IPPROTO_UDP: { if (!pf_pull_hdr(m, off, &pd.hdr.udp, sizeof(pd.hdr.udp), &action, &reason, AF_INET)) { log = action != PF_PASS; goto done; } pd.sport = &pd.hdr.udp.uh_sport; pd.dport = &pd.hdr.udp.uh_dport; if (pd.hdr.udp.uh_dport == 0 || ntohs(pd.hdr.udp.uh_ulen) > m->m_pkthdr.len - off || ntohs(pd.hdr.udp.uh_ulen) < sizeof(struct udphdr)) { action = PF_DROP; REASON_SET(&reason, PFRES_SHORT); goto done; } action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); if (action == PF_PASS) { if (V_pfsync_update_state_ptr != NULL) V_pfsync_update_state_ptr(s); r = s->rule.ptr; a = s->anchor.ptr; log = s->log; } else if (s == NULL) action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, &a, &ruleset, inp); break; } case IPPROTO_ICMP: { if (!pf_pull_hdr(m, off, &pd.hdr.icmp, ICMP_MINLEN, &action, &reason, AF_INET)) { log = action != PF_PASS; goto done; } action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd, &reason); if (action == PF_PASS) { if (V_pfsync_update_state_ptr != NULL) V_pfsync_update_state_ptr(s); r = s->rule.ptr; a = s->anchor.ptr; log = s->log; } else if (s == NULL) action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, &a, &ruleset, inp); break; } #ifdef INET6 case IPPROTO_ICMPV6: { action = PF_DROP; DPFPRINTF(PF_DEBUG_MISC, ("pf: dropping IPv4 packet with ICMPv6 payload\n")); goto done; } #endif default: action = pf_test_state_other(&s, dir, kif, m, &pd); if (action == PF_PASS) { if (V_pfsync_update_state_ptr != NULL) V_pfsync_update_state_ptr(s); r = s->rule.ptr; a = s->anchor.ptr; log = s->log; } else if (s == NULL) action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, &a, &ruleset, inp); break; } done: PF_RULES_RUNLOCK(); if (action == PF_PASS && h->ip_hl > 5 && !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { action = PF_DROP; REASON_SET(&reason, PFRES_IPOPTIONS); log = r->log; DPFPRINTF(PF_DEBUG_MISC, ("pf: dropping packet with ip options\n")); } if (s && s->tag > 0 && pf_tag_packet(m, &pd, s->tag)) { action = PF_DROP; REASON_SET(&reason, PFRES_MEMORY); } if (r->rtableid >= 0) M_SETFIB(m, r->rtableid); if (r->scrub_flags & PFSTATE_SETPRIO) { if (pd.tos & IPTOS_LOWDELAY) pqid = 1; if (vlan_set_pcp(m, r->set_prio[pqid])) { action = PF_DROP; REASON_SET(&reason, PFRES_MEMORY); log = 1; DPFPRINTF(PF_DEBUG_MISC, ("pf: failed to allocate 802.1q mtag\n")); } } #ifdef ALTQ if (s && s->qid) { pd.act.pqid = s->pqid; pd.act.qid = s->qid; } else if (r->qid) { pd.act.pqid = r->pqid; pd.act.qid = r->qid; } if (action == PF_PASS && pd.act.qid) { if (pd.pf_mtag == NULL && ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { action = PF_DROP; REASON_SET(&reason, PFRES_MEMORY); } else { if (s != NULL) pd.pf_mtag->qid_hash = pf_state_hash(s); if (pqid || (pd.tos & IPTOS_LOWDELAY)) pd.pf_mtag->qid = pd.act.pqid; else pd.pf_mtag->qid = pd.act.qid; /* Add hints for ecn. */ pd.pf_mtag->hdr = h; } } #endif /* ALTQ */ /* * connections redirected to loopback should not match sockets * bound specifically to loopback due to security implications, * see tcp_input() and in_pcblookup_listen(). */ if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && (s->nat_rule.ptr->action == PF_RDR || s->nat_rule.ptr->action == PF_BINAT) && IN_LOOPBACK(ntohl(pd.dst->v4.s_addr))) m->m_flags |= M_SKIP_FIREWALL; if (__predict_false(ip_divert_ptr != NULL) && action == PF_PASS && r->divert.port && !PACKET_LOOPED(&pd)) { ipfwtag = m_tag_alloc(MTAG_IPFW_RULE, 0, sizeof(struct ipfw_rule_ref), M_NOWAIT | M_ZERO); if (ipfwtag != NULL) { ((struct ipfw_rule_ref *)(ipfwtag+1))->info = ntohs(r->divert.port); ((struct ipfw_rule_ref *)(ipfwtag+1))->rulenum = dir; if (s) PF_STATE_UNLOCK(s); m_tag_prepend(m, ipfwtag); if (m->m_flags & M_FASTFWD_OURS) { if (pd.pf_mtag == NULL && ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { action = PF_DROP; REASON_SET(&reason, PFRES_MEMORY); log = 1; DPFPRINTF(PF_DEBUG_MISC, ("pf: failed to allocate tag\n")); } else { pd.pf_mtag->flags |= PF_FASTFWD_OURS_PRESENT; m->m_flags &= ~M_FASTFWD_OURS; } } ip_divert_ptr(*m0, dir == PF_IN); *m0 = NULL; return (action); } else { /* XXX: ipfw has the same behaviour! */ action = PF_DROP; REASON_SET(&reason, PFRES_MEMORY); log = 1; DPFPRINTF(PF_DEBUG_MISC, ("pf: failed to allocate divert tag\n")); } } if (log) { struct pf_krule *lr; if (s != NULL && s->nat_rule.ptr != NULL && s->nat_rule.ptr->log & PF_LOG_ALL) lr = s->nat_rule.ptr; else lr = r; PFLOG_PACKET(kif, m, AF_INET, dir, reason, lr, a, ruleset, &pd, (s == NULL)); } pf_counter_u64_critical_enter(); pf_counter_u64_add_protected(&kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS], pd.tot_len); pf_counter_u64_add_protected(&kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS], 1); if (action == PF_PASS || r->action == PF_DROP) { dirndx = (dir == PF_OUT); pf_counter_u64_add_protected(&r->packets[dirndx], 1); pf_counter_u64_add_protected(&r->bytes[dirndx], pd.tot_len); pf_update_timestamp(r); if (a != NULL) { pf_counter_u64_add_protected(&a->packets[dirndx], 1); pf_counter_u64_add_protected(&a->bytes[dirndx], pd.tot_len); } if (s != NULL) { if (s->nat_rule.ptr != NULL) { pf_counter_u64_add_protected(&s->nat_rule.ptr->packets[dirndx], 1); pf_counter_u64_add_protected(&s->nat_rule.ptr->bytes[dirndx], pd.tot_len); } if (s->src_node != NULL) { counter_u64_add(s->src_node->packets[dirndx], 1); counter_u64_add(s->src_node->bytes[dirndx], pd.tot_len); } if (s->nat_src_node != NULL) { counter_u64_add(s->nat_src_node->packets[dirndx], 1); counter_u64_add(s->nat_src_node->bytes[dirndx], pd.tot_len); } dirndx = (dir == s->direction) ? 0 : 1; s->packets[dirndx]++; s->bytes[dirndx] += pd.tot_len; } tr = r; nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; if (nr != NULL && r == &V_pf_default_rule) tr = nr; if (tr->src.addr.type == PF_ADDR_TABLE) pfr_update_stats(tr->src.addr.p.tbl, (s == NULL) ? pd.src : &s->key[(s->direction == PF_IN)]-> addr[(s->direction == PF_OUT)], pd.af, pd.tot_len, dir == PF_OUT, r->action == PF_PASS, tr->src.neg); if (tr->dst.addr.type == PF_ADDR_TABLE) pfr_update_stats(tr->dst.addr.p.tbl, (s == NULL) ? pd.dst : &s->key[(s->direction == PF_IN)]-> addr[(s->direction == PF_IN)], pd.af, pd.tot_len, dir == PF_OUT, r->action == PF_PASS, tr->dst.neg); } pf_counter_u64_critical_exit(); switch (action) { case PF_SYNPROXY_DROP: m_freem(*m0); case PF_DEFER: *m0 = NULL; action = PF_PASS; break; case PF_DROP: m_freem(*m0); *m0 = NULL; break; default: /* pf_route() returns unlocked. */ if (r->rt) { pf_route(m0, r, dir, kif->pfik_ifp, s, &pd, inp); return (action); } if (pf_dummynet(&pd, dir, s, r, m0) != 0) { action = PF_DROP; REASON_SET(&reason, PFRES_MEMORY); } break; } SDT_PROBE4(pf, ip, test, done, action, reason, r, s); if (s) PF_STATE_UNLOCK(s); return (action); } #endif /* INET */ #ifdef INET6 int pf_test6(int dir, int pflags, struct ifnet *ifp, struct mbuf **m0, struct inpcb *inp) { struct pfi_kkif *kif; u_short action, reason = 0, log = 0; struct mbuf *m = *m0, *n = NULL; struct m_tag *mtag; struct ip6_hdr *h = NULL; struct pf_krule *a = NULL, *r = &V_pf_default_rule, *tr, *nr; struct pf_kstate *s = NULL; struct pf_kruleset *ruleset = NULL; struct pf_pdesc pd; int off, terminal = 0, dirndx, rh_cnt = 0, pqid = 0; PF_RULES_RLOCK_TRACKER; KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: bad direction %d\n", __func__, dir)); M_ASSERTPKTHDR(m); if (!V_pf_status.running) return (PF_PASS); PF_RULES_RLOCK(); kif = (struct pfi_kkif *)ifp->if_pf_kif; if (__predict_false(kif == NULL)) { DPFPRINTF(PF_DEBUG_URGENT, ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname)); PF_RULES_RUNLOCK(); return (PF_DROP); } if (kif->pfik_flags & PFI_IFLAG_SKIP) { PF_RULES_RUNLOCK(); return (PF_PASS); } if (m->m_flags & M_SKIP_FIREWALL) { PF_RULES_RUNLOCK(); return (PF_PASS); } memset(&pd, 0, sizeof(pd)); pd.pf_mtag = pf_find_mtag(m); if (pd.pf_mtag != NULL && (pd.pf_mtag->flags & PF_TAG_ROUTE_TO)) { pd.pf_mtag->flags &= ~PF_TAG_ROUTE_TO; ifp = ifnet_byindexgen(pd.pf_mtag->if_index, pd.pf_mtag->if_idxgen); if (ifp == NULL || ifp->if_flags & IFF_DYING) { PF_RULES_RUNLOCK(); m_freem(*m0); *m0 = NULL; return (PF_PASS); } PF_RULES_RUNLOCK(); nd6_output_ifp(ifp, ifp, m, (struct sockaddr_in6 *)&pd.pf_mtag->dst, NULL); *m0 = NULL; return (PF_PASS); } if (pd.pf_mtag && pd.pf_mtag->dnpipe) { pd.act.dnpipe = pd.pf_mtag->dnpipe; pd.act.flags = pd.pf_mtag->dnflags; } if (ip_dn_io_ptr != NULL && pd.pf_mtag != NULL && pd.pf_mtag->flags & PF_TAG_DUMMYNET) { pd.pf_mtag->flags &= ~PF_TAG_DUMMYNET; /* Dummynet re-injects packets after they've * completed their delay. We've already * processed them, so pass unconditionally. */ PF_RULES_RUNLOCK(); return (PF_PASS); } /* We do IP header normalization and packet reassembly here */ if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) { action = PF_DROP; goto done; } m = *m0; /* pf_normalize messes with m0 */ h = mtod(m, struct ip6_hdr *); /* * we do not support jumbogram. if we keep going, zero ip6_plen * will do something bad, so drop the packet for now. */ if (htons(h->ip6_plen) == 0) { action = PF_DROP; REASON_SET(&reason, PFRES_NORM); /*XXX*/ goto done; } pd.src = (struct pf_addr *)&h->ip6_src; pd.dst = (struct pf_addr *)&h->ip6_dst; pd.sport = pd.dport = NULL; pd.ip_sum = NULL; pd.proto_sum = NULL; pd.dir = dir; pd.sidx = (dir == PF_IN) ? 0 : 1; pd.didx = (dir == PF_IN) ? 1 : 0; pd.af = AF_INET6; pd.tos = IPV6_DSCP(h); pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr); off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr); pd.proto = h->ip6_nxt; do { switch (pd.proto) { case IPPROTO_FRAGMENT: action = pf_test_fragment(&r, dir, kif, m, h, &pd, &a, &ruleset); if (action == PF_DROP) REASON_SET(&reason, PFRES_FRAG); goto done; case IPPROTO_ROUTING: { struct ip6_rthdr rthdr; if (rh_cnt++) { DPFPRINTF(PF_DEBUG_MISC, ("pf: IPv6 more than one rthdr\n")); action = PF_DROP; REASON_SET(&reason, PFRES_IPOPTIONS); log = 1; goto done; } if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL, &reason, pd.af)) { DPFPRINTF(PF_DEBUG_MISC, ("pf: IPv6 short rthdr\n")); action = PF_DROP; REASON_SET(&reason, PFRES_SHORT); log = 1; goto done; } if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) { DPFPRINTF(PF_DEBUG_MISC, ("pf: IPv6 rthdr0\n")); action = PF_DROP; REASON_SET(&reason, PFRES_IPOPTIONS); log = 1; goto done; } /* FALLTHROUGH */ } case IPPROTO_AH: case IPPROTO_HOPOPTS: case IPPROTO_DSTOPTS: { /* get next header and header length */ struct ip6_ext opt6; if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6), NULL, &reason, pd.af)) { DPFPRINTF(PF_DEBUG_MISC, ("pf: IPv6 short opt\n")); action = PF_DROP; log = 1; goto done; } if (pd.proto == IPPROTO_AH) off += (opt6.ip6e_len + 2) * 4; else off += (opt6.ip6e_len + 1) * 8; pd.proto = opt6.ip6e_nxt; /* goto the next header */ break; } default: terminal++; break; } } while (!terminal); /* if there's no routing header, use unmodified mbuf for checksumming */ if (!n) n = m; switch (pd.proto) { case IPPROTO_TCP: { if (!pf_pull_hdr(m, off, &pd.hdr.tcp, sizeof(pd.hdr.tcp), &action, &reason, AF_INET6)) { log = action != PF_PASS; goto done; } pd.p_len = pd.tot_len - off - (pd.hdr.tcp.th_off << 2); pd.sport = &pd.hdr.tcp.th_sport; pd.dport = &pd.hdr.tcp.th_dport; action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); if (action == PF_DROP) goto done; action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, &reason); if (action == PF_PASS) { if (V_pfsync_update_state_ptr != NULL) V_pfsync_update_state_ptr(s); r = s->rule.ptr; a = s->anchor.ptr; log = s->log; } else if (s == NULL) action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, &a, &ruleset, inp); break; } case IPPROTO_UDP: { if (!pf_pull_hdr(m, off, &pd.hdr.udp, sizeof(pd.hdr.udp), &action, &reason, AF_INET6)) { log = action != PF_PASS; goto done; } pd.sport = &pd.hdr.udp.uh_sport; pd.dport = &pd.hdr.udp.uh_dport; if (pd.hdr.udp.uh_dport == 0 || ntohs(pd.hdr.udp.uh_ulen) > m->m_pkthdr.len - off || ntohs(pd.hdr.udp.uh_ulen) < sizeof(struct udphdr)) { action = PF_DROP; REASON_SET(&reason, PFRES_SHORT); goto done; } action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); if (action == PF_PASS) { if (V_pfsync_update_state_ptr != NULL) V_pfsync_update_state_ptr(s); r = s->rule.ptr; a = s->anchor.ptr; log = s->log; } else if (s == NULL) action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, &a, &ruleset, inp); break; } case IPPROTO_ICMP: { action = PF_DROP; DPFPRINTF(PF_DEBUG_MISC, ("pf: dropping IPv6 packet with ICMPv4 payload\n")); goto done; } case IPPROTO_ICMPV6: { if (!pf_pull_hdr(m, off, &pd.hdr.icmp6, sizeof(pd.hdr.icmp6), &action, &reason, AF_INET6)) { log = action != PF_PASS; goto done; } action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd, &reason); if (action == PF_PASS) { if (V_pfsync_update_state_ptr != NULL) V_pfsync_update_state_ptr(s); r = s->rule.ptr; a = s->anchor.ptr; log = s->log; } else if (s == NULL) action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, &a, &ruleset, inp); break; } default: action = pf_test_state_other(&s, dir, kif, m, &pd); if (action == PF_PASS) { if (V_pfsync_update_state_ptr != NULL) V_pfsync_update_state_ptr(s); r = s->rule.ptr; a = s->anchor.ptr; log = s->log; } else if (s == NULL) action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, &a, &ruleset, inp); break; } done: PF_RULES_RUNLOCK(); if (n != m) { m_freem(n); n = NULL; } /* handle dangerous IPv6 extension headers. */ if (action == PF_PASS && rh_cnt && !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { action = PF_DROP; REASON_SET(&reason, PFRES_IPOPTIONS); log = r->log; DPFPRINTF(PF_DEBUG_MISC, ("pf: dropping packet with dangerous v6 headers\n")); } if (s && s->tag > 0 && pf_tag_packet(m, &pd, s->tag)) { action = PF_DROP; REASON_SET(&reason, PFRES_MEMORY); } if (r->rtableid >= 0) M_SETFIB(m, r->rtableid); if (r->scrub_flags & PFSTATE_SETPRIO) { if (pd.tos & IPTOS_LOWDELAY) pqid = 1; if (vlan_set_pcp(m, r->set_prio[pqid])) { action = PF_DROP; REASON_SET(&reason, PFRES_MEMORY); log = 1; DPFPRINTF(PF_DEBUG_MISC, ("pf: failed to allocate 802.1q mtag\n")); } } #ifdef ALTQ if (s && s->qid) { pd.act.pqid = s->pqid; pd.act.qid = s->qid; } else if (r->qid) { pd.act.pqid = r->pqid; pd.act.qid = r->qid; } if (action == PF_PASS && pd.act.qid) { if (pd.pf_mtag == NULL && ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { action = PF_DROP; REASON_SET(&reason, PFRES_MEMORY); } else { if (s != NULL) pd.pf_mtag->qid_hash = pf_state_hash(s); if (pd.tos & IPTOS_LOWDELAY) pd.pf_mtag->qid = pd.act.pqid; else pd.pf_mtag->qid = pd.act.qid; /* Add hints for ecn. */ pd.pf_mtag->hdr = h; } } #endif /* ALTQ */ if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && (s->nat_rule.ptr->action == PF_RDR || s->nat_rule.ptr->action == PF_BINAT) && IN6_IS_ADDR_LOOPBACK(&pd.dst->v6)) m->m_flags |= M_SKIP_FIREWALL; /* XXX: Anybody working on it?! */ if (r->divert.port) printf("pf: divert(9) is not supported for IPv6\n"); if (log) { struct pf_krule *lr; if (s != NULL && s->nat_rule.ptr != NULL && s->nat_rule.ptr->log & PF_LOG_ALL) lr = s->nat_rule.ptr; else lr = r; PFLOG_PACKET(kif, m, AF_INET6, dir, reason, lr, a, ruleset, &pd, (s == NULL)); } pf_counter_u64_critical_enter(); pf_counter_u64_add_protected(&kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS], pd.tot_len); pf_counter_u64_add_protected(&kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS], 1); if (action == PF_PASS || r->action == PF_DROP) { dirndx = (dir == PF_OUT); pf_counter_u64_add_protected(&r->packets[dirndx], 1); pf_counter_u64_add_protected(&r->bytes[dirndx], pd.tot_len); if (a != NULL) { pf_counter_u64_add_protected(&a->packets[dirndx], 1); pf_counter_u64_add_protected(&a->bytes[dirndx], pd.tot_len); } if (s != NULL) { if (s->nat_rule.ptr != NULL) { pf_counter_u64_add_protected(&s->nat_rule.ptr->packets[dirndx], 1); pf_counter_u64_add_protected(&s->nat_rule.ptr->bytes[dirndx], pd.tot_len); } if (s->src_node != NULL) { counter_u64_add(s->src_node->packets[dirndx], 1); counter_u64_add(s->src_node->bytes[dirndx], pd.tot_len); } if (s->nat_src_node != NULL) { counter_u64_add(s->nat_src_node->packets[dirndx], 1); counter_u64_add(s->nat_src_node->bytes[dirndx], pd.tot_len); } dirndx = (dir == s->direction) ? 0 : 1; s->packets[dirndx]++; s->bytes[dirndx] += pd.tot_len; } tr = r; nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; if (nr != NULL && r == &V_pf_default_rule) tr = nr; if (tr->src.addr.type == PF_ADDR_TABLE) pfr_update_stats(tr->src.addr.p.tbl, (s == NULL) ? pd.src : &s->key[(s->direction == PF_IN)]->addr[0], pd.af, pd.tot_len, dir == PF_OUT, r->action == PF_PASS, tr->src.neg); if (tr->dst.addr.type == PF_ADDR_TABLE) pfr_update_stats(tr->dst.addr.p.tbl, (s == NULL) ? pd.dst : &s->key[(s->direction == PF_IN)]->addr[1], pd.af, pd.tot_len, dir == PF_OUT, r->action == PF_PASS, tr->dst.neg); } pf_counter_u64_critical_exit(); switch (action) { case PF_SYNPROXY_DROP: m_freem(*m0); case PF_DEFER: *m0 = NULL; action = PF_PASS; break; case PF_DROP: m_freem(*m0); *m0 = NULL; break; default: /* pf_route6() returns unlocked. */ if (r->rt) { pf_route6(m0, r, dir, kif->pfik_ifp, s, &pd, inp); return (action); } if (pf_dummynet(&pd, dir, s, r, m0) != 0) { action = PF_DROP; REASON_SET(&reason, PFRES_MEMORY); } break; } if (s) PF_STATE_UNLOCK(s); /* If reassembled packet passed, create new fragments. */ if (action == PF_PASS && *m0 && dir == PF_OUT && (mtag = m_tag_find(m, PF_REASSEMBLED, NULL)) != NULL) action = pf_refragment6(ifp, m0, mtag); SDT_PROBE4(pf, ip, test6, done, action, reason, r, s); return (action); } #endif /* INET6 */