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Index: sys/conf/files
===================================================================
--- sys/conf/files
+++ sys/conf/files
@@ -4081,6 +4081,7 @@
netinet6/in6_rmx.c optional inet6
netinet6/in6_rss.c optional inet6 rss
netinet6/in6_src.c optional inet6
+netinet6/ip6_fastfwd.c optional inet6
netinet6/ip6_forward.c optional inet6
netinet6/ip6_gre.c optional gre inet6
netinet6/ip6_id.c optional inet6
Index: sys/netinet6/in6_var.h
===================================================================
--- sys/netinet6/in6_var.h
+++ sys/netinet6/in6_var.h
@@ -819,6 +819,7 @@
/*
* Extended API for IPv6 FIB support.
*/
+struct mbuf *ip6_tryforward(struct mbuf *);
void in6_rtredirect(struct sockaddr *, struct sockaddr *, struct sockaddr *,
int, struct sockaddr *, u_int);
int in6_rtrequest(int, struct sockaddr *, struct sockaddr *,
Index: sys/netinet6/ip6_fastfwd.c
===================================================================
--- /dev/null
+++ sys/netinet6/ip6_fastfwd.c
@@ -0,0 +1,287 @@
+/*-
+ * Copyright (c) 2014-2016 Andrey V. Elsukov <ae@FreeBSD.org>
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include "opt_inet6.h"
+#include "opt_ipstealth.h"
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/mbuf.h>
+#include <sys/socket.h>
+#include <sys/kernel.h>
+#include <sys/sysctl.h>
+
+#include <net/if.h>
+#include <net/if_var.h>
+#include <net/route.h>
+#include <net/pfil.h>
+#include <net/vnet.h>
+
+#include <netinet/in.h>
+#include <netinet/in_var.h>
+#include <netinet/ip_var.h>
+#include <netinet/ip6.h>
+#include <netinet/icmp6.h>
+#include <netinet6/in6_var.h>
+#include <netinet6/in6_fib.h>
+#include <netinet6/ip6_var.h>
+#include <netinet6/nd6.h>
+
+static int
+ip6_findroute(struct nhop6_basic *pnh, const struct sockaddr_in6 *dst,
+ struct mbuf *m)
+{
+
+ if (fib6_lookup_nh_basic(M_GETFIB(m), &dst->sin6_addr,
+ dst->sin6_scope_id, 0, dst->sin6_flowinfo, pnh) != 0) {
+ IP6STAT_INC(ip6s_noroute);
+ IP6STAT_INC(ip6s_cantforward);
+ icmp6_error(m, ICMP6_DST_UNREACH,
+ ICMP6_DST_UNREACH_NOROUTE, 0);
+ return (EHOSTUNREACH);
+ }
+ if (pnh->nh_flags & NHF_BLACKHOLE) {
+ IP6STAT_INC(ip6s_cantforward);
+ m_freem(m);
+ return (EHOSTUNREACH);
+ }
+
+ if (pnh->nh_flags & NHF_REJECT) {
+ IP6STAT_INC(ip6s_cantforward);
+ icmp6_error(m, ICMP6_DST_UNREACH,
+ ICMP6_DST_UNREACH_REJECT, 0);
+ return (EHOSTUNREACH);
+ }
+ return (0);
+}
+
+struct mbuf*
+ip6_tryforward(struct mbuf *m)
+{
+ struct sockaddr_in6 dst;
+ struct nhop6_basic nh;
+ struct m_tag *fwd_tag;
+ struct ip6_hdr *ip6;
+ struct ifnet *rcvif;
+ uint32_t plen;
+ int error;
+
+ /*
+ * Fallback conditions to ip6_input for slow path processing.
+ */
+ ip6 = mtod(m, struct ip6_hdr *);
+ if (ip6->ip6_nxt == IPPROTO_HOPOPTS ||
+ IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
+ IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst) ||
+ IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src) ||
+ IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) ||
+ in6_localip(&ip6->ip6_dst))
+ return (m);
+ /*
+ * Check that the amount of data in the buffers
+ * is as at least much as the IPv6 header would have us expect.
+ * Trim mbufs if longer than we expect.
+ * Drop packet if shorter than we expect.
+ */
+ rcvif = m->m_pkthdr.rcvif;
+ plen = ntohs(ip6->ip6_plen);
+ if (plen == 0) {
+ /*
+ * Jumbograms must have hop-by-hop header and go via
+ * slow path.
+ */
+ IP6STAT_INC(ip6s_badoptions);
+ goto dropin;
+ }
+ if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
+ IP6STAT_INC(ip6s_tooshort);
+ in6_ifstat_inc(rcvif, ifs6_in_truncated);
+ goto dropin;
+ }
+ if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
+ if (m->m_len == m->m_pkthdr.len) {
+ m->m_len = sizeof(struct ip6_hdr) + plen;
+ m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
+ } else
+ m_adj(m, sizeof(struct ip6_hdr) + plen -
+ m->m_pkthdr.len);
+ }
+
+ /*
+ * Hop limit.
+ */
+#ifdef IPSTEALTH
+ if (!V_ip6stealth)
+#endif
+ if (ip6->ip6_hlim <= IPV6_HLIMDEC) {
+ icmp6_error(m, ICMP6_TIME_EXCEEDED,
+ ICMP6_TIME_EXCEED_TRANSIT, 0);
+ m = NULL;
+ goto dropin;
+ }
+
+ bzero(&dst, sizeof(dst));
+ dst.sin6_family = AF_INET6;
+ dst.sin6_len = sizeof(dst);
+ dst.sin6_addr = ip6->ip6_dst;
+
+ /*
+ * Incoming packet firewall processing.
+ */
+ if (!PFIL_HOOKED(&V_inet6_pfil_hook))
+ goto passin;
+ if (pfil_run_hooks(&V_inet6_pfil_hook, &m, rcvif, PFIL_IN,
+ NULL) != 0 || m == NULL)
+ goto dropin;
+ /*
+ * If packet filter sets the M_FASTFWD_OURS flag, this means
+ * that new destination or next hop is our local address.
+ * So, we can just go back to ip6_input.
+ * XXX: should we decrement ip6_hlim in such case?
+ *
+ * Also it can forward packet to another destination, e.g.
+ * M_IP6_NEXTHOP flag is set and fwd_tag is attached to mbuf.
+ */
+ if (m->m_flags & M_FASTFWD_OURS)
+ return (m);
+
+ ip6 = mtod(m, struct ip6_hdr *);
+ if ((m->m_flags & M_IP6_NEXTHOP) &&
+ (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) {
+ /*
+ * Now we will find route to forwarded by pfil destination.
+ */
+ bcopy((fwd_tag + 1), &dst, sizeof(dst));
+ m->m_flags &= ~M_IP6_NEXTHOP;
+ m_tag_delete(m, fwd_tag);
+ } else {
+ /* Update dst since pfil could change it */
+ dst.sin6_addr = ip6->ip6_dst;
+ }
+passin:
+ /*
+ * Find route to destination.
+ */
+ if (ip6_findroute(&nh, &dst, m) != 0) {
+ m = NULL;
+ in6_ifstat_inc(rcvif, ifs6_in_noroute);
+ goto dropin;
+ }
+ /*
+ * We used slow path processing for packets with scoped addresses.
+ * So, scope checks aren't needed here.
+ */
+ if (m->m_pkthdr.len > nh.nh_mtu) {
+ in6_ifstat_inc(nh.nh_ifp, ifs6_in_toobig);
+ icmp6_error(m, ICMP6_PACKET_TOO_BIG, 0, nh.nh_mtu);
+ m = NULL;
+ goto dropout;
+ }
+
+ /*
+ * Outgoing packet firewall processing.
+ */
+ if (!PFIL_HOOKED(&V_inet6_pfil_hook))
+ goto passout;
+ if (pfil_run_hooks(&V_inet6_pfil_hook, &m, nh.nh_ifp, PFIL_OUT,
+ NULL) != 0 || m == NULL)
+ goto dropout;
+ /*
+ * If packet filter sets the M_FASTFWD_OURS flag, this means
+ * that new destination or next hop is our local address.
+ * So, we can just go back to ip6_input.
+ *
+ * Also it can forward packet to another destination, e.g.
+ * M_IP6_NEXTHOP flag is set and fwd_tag is attached to mbuf.
+ */
+ if (m->m_flags & M_FASTFWD_OURS) {
+ /*
+ * XXX: we did one hop and should decrement hop limit. But
+ * now we are the destination and just don't pay attention.
+ */
+ return (m);
+ }
+ /*
+ * Again. A packet filter could change the destination address.
+ */
+ ip6 = mtod(m, struct ip6_hdr *);
+ if (m->m_flags & M_IP6_NEXTHOP)
+ fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL);
+ else
+ fwd_tag = NULL;
+
+ if (fwd_tag != NULL ||
+ !IN6_ARE_ADDR_EQUAL(&dst.sin6_addr, &ip6->ip6_dst)) {
+ if (fwd_tag != NULL) {
+ bcopy((fwd_tag + 1), &dst, sizeof(dst));
+ m->m_flags &= ~M_IP6_NEXTHOP;
+ m_tag_delete(m, fwd_tag);
+ } else
+ dst.sin6_addr = ip6->ip6_dst;
+ /*
+ * Redo route lookup with new destination address
+ */
+ if (ip6_findroute(&nh, &dst, m) != 0) {
+ m = NULL;
+ goto dropout;
+ }
+ }
+passout:
+#ifdef IPSTEALTH
+ if (!V_ip6stealth)
+#endif
+ {
+ ip6->ip6_hlim -= IPV6_HLIMDEC;
+ }
+
+ m_clrprotoflags(m); /* Avoid confusing lower layers. */
+ IP_PROBE(send, NULL, NULL, ip6, ifp, NULL, ip6);
+ dst.sin6_addr = nh.nh_addr;
+
+ error = (*nh.nh_ifp->if_output)(nh.nh_ifp, m,
+ (struct sockaddr *)&dst, NULL);
+ if (error != 0) {
+ in6_ifstat_inc(nh.nh_ifp, ifs6_out_discard);
+ IP6STAT_INC(ip6s_cantforward);
+ } else {
+ in6_ifstat_inc(nh.nh_ifp, ifs6_out_forward);
+ IP6STAT_INC(ip6s_forward);
+ }
+ return (NULL);
+dropin:
+ in6_ifstat_inc(rcvif, ifs6_in_discard);
+ goto drop;
+dropout:
+ in6_ifstat_inc(nh.nh_ifp, ifs6_out_discard);
+drop:
+ if (m != NULL)
+ m_freem(m);
+ return (NULL);
+}
+
Index: sys/netinet6/ip6_input.c
===================================================================
--- sys/netinet6/ip6_input.c
+++ sys/netinet6/ip6_input.c
@@ -119,6 +119,7 @@
#include <netinet6/in6_rss.h>
#ifdef IPSEC
+#include <netipsec/key.h>
#include <netipsec/ipsec.h>
#include <netinet6/ip6_ipsec.h>
#include <netipsec/ipsec6.h>
@@ -548,12 +549,20 @@
struct in6_addr odst;
struct ip6_hdr *ip6;
struct in6_ifaddr *ia;
+ struct ifnet *rcvif;
u_int32_t plen;
u_int32_t rtalert = ~0;
int off = sizeof(struct ip6_hdr), nest;
int nxt, ours = 0;
int srcrt = 0;
+ /*
+ * Drop the packet if IPv6 operation is disabled on the interface.
+ */
+ rcvif = m->m_pkthdr.rcvif;
+ if ((ND_IFINFO(rcvif)->flags & ND6_IFF_IFDISABLED))
+ goto bad;
+
#ifdef IPSEC
/*
* should the inner packet be considered authentic?
@@ -566,18 +575,8 @@
#endif /* IPSEC */
- if (m->m_flags & M_FASTFWD_OURS) {
- /*
- * Firewall changed destination to local.
- */
- m->m_flags &= ~M_FASTFWD_OURS;
- ours = 1;
- ip6 = mtod(m, struct ip6_hdr *);
- goto hbhcheck;
- }
-
/*
- * mbuf statistics
+ * Update statistics.
*/
if (m->m_flags & M_EXT) {
if (m->m_next)
@@ -588,22 +587,27 @@
if (m->m_next) {
if (m->m_flags & M_LOOP) {
IP6STAT_INC(ip6s_m2m[V_loif->if_index]);
- } else if (m->m_pkthdr.rcvif->if_index < IP6S_M2MMAX)
- IP6STAT_INC(
- ip6s_m2m[m->m_pkthdr.rcvif->if_index]);
+ } else if (rcvif->if_index < IP6S_M2MMAX)
+ IP6STAT_INC(ip6s_m2m[rcvif->if_index]);
else
IP6STAT_INC(ip6s_m2m[0]);
} else
IP6STAT_INC(ip6s_m1);
}
- /* drop the packet if IPv6 operation is disabled on the IF */
- if ((ND_IFINFO(m->m_pkthdr.rcvif)->flags & ND6_IFF_IFDISABLED))
- goto bad;
-
- in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
+ in6_ifstat_inc(rcvif, ifs6_in_receive);
IP6STAT_INC(ip6s_total);
+ if (m->m_flags & M_FASTFWD_OURS) {
+ /*
+ * Firewall changed destination to local.
+ */
+ m->m_flags &= ~M_FASTFWD_OURS;
+ ours = 1;
+ ip6 = mtod(m, struct ip6_hdr *);
+ goto hbhcheck;
+ }
+
#ifndef PULLDOWN_TEST
/*
* L2 bridge code and some other code can return mbuf chain
@@ -617,10 +621,8 @@
n = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
else
n = m_gethdr(M_NOWAIT, MT_DATA);
- if (n == NULL) {
- m_freem(m);
- return; /* ENOBUFS */
- }
+ if (n == NULL)
+ goto bad;
m_move_pkthdr(n, m);
m_copydata(m, 0, n->m_pkthdr.len, mtod(n, caddr_t));
@@ -632,26 +634,22 @@
#endif
if (m->m_len < sizeof(struct ip6_hdr)) {
- struct ifnet *inifp;
- inifp = m->m_pkthdr.rcvif;
if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
IP6STAT_INC(ip6s_toosmall);
- in6_ifstat_inc(inifp, ifs6_in_hdrerr);
- return;
+ in6_ifstat_inc(rcvif, ifs6_in_hdrerr);
+ goto bad;
}
}
ip6 = mtod(m, struct ip6_hdr *);
-
if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
IP6STAT_INC(ip6s_badvers);
- in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
+ in6_ifstat_inc(rcvif, ifs6_in_hdrerr);
goto bad;
}
IP6STAT_INC(ip6s_nxthist[ip6->ip6_nxt]);
-
- IP_PROBE(receive, NULL, NULL, ip6, m->m_pkthdr.rcvif, NULL, ip6);
+ IP_PROBE(receive, NULL, NULL, ip6, rcvif, NULL, ip6);
/*
* Check against address spoofing/corruption.
@@ -662,7 +660,7 @@
* XXX: "badscope" is not very suitable for a multicast source.
*/
IP6STAT_INC(ip6s_badscope);
- in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
+ in6_ifstat_inc(rcvif, ifs6_in_addrerr);
goto bad;
}
if (IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) &&
@@ -674,7 +672,7 @@
* as the outgoing/incoming interface.
*/
IP6STAT_INC(ip6s_badscope);
- in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
+ in6_ifstat_inc(rcvif, ifs6_in_addrerr);
goto bad;
}
if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
@@ -686,7 +684,7 @@
* a packet is received, it must be silently dropped.
*/
IP6STAT_INC(ip6s_badscope);
- in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
+ in6_ifstat_inc(rcvif, ifs6_in_addrerr);
goto bad;
}
#ifdef ALTQ
@@ -710,7 +708,7 @@
if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
IP6STAT_INC(ip6s_badscope);
- in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
+ in6_ifstat_inc(rcvif, ifs6_in_addrerr);
goto bad;
}
#if 0
@@ -724,16 +722,25 @@
if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
IP6STAT_INC(ip6s_badscope);
- in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
+ in6_ifstat_inc(rcvif, ifs6_in_addrerr);
goto bad;
}
#endif
+ /* Try to forward the packet, but if we fail continue */
#ifdef IPSEC
+ if (!key_havesp(IPSEC_DIR_INBOUND) &&
+ !key_havesp(IPSEC_DIR_OUTBOUND) && V_ip6_forwarding != 0)
+ if (ip6_tryforward(m) == NULL)
+ return;
/*
* Bypass packet filtering for packets previously handled by IPsec.
*/
if (ip6_ipsec_filtertunnel(m))
goto passin;
+#else
+ if (V_ip6_forwarding != 0)
+ if (ip6_tryforward(m) == NULL)
+ return;
#endif /* IPSEC */
/*
@@ -749,8 +756,7 @@
if (!PFIL_HOOKED(&V_inet6_pfil_hook))
goto passin;
- if (pfil_run_hooks(&V_inet6_pfil_hook, &m,
- m->m_pkthdr.rcvif, PFIL_IN, NULL))
+ if (pfil_run_hooks(&V_inet6_pfil_hook, &m, rcvif, PFIL_IN, NULL))
return;
if (m == NULL) /* consumed by filter */
return;
@@ -788,8 +794,8 @@
IP6STAT_INC(ip6s_badscope); /* XXX */
goto bad;
}
- if (in6_setscope(&ip6->ip6_src, m->m_pkthdr.rcvif, NULL) ||
- in6_setscope(&ip6->ip6_dst, m->m_pkthdr.rcvif, NULL)) {
+ if (in6_setscope(&ip6->ip6_src, rcvif, NULL) ||
+ in6_setscope(&ip6->ip6_dst, rcvif, NULL)) {
IP6STAT_INC(ip6s_badscope);
goto bad;
}
@@ -799,7 +805,7 @@
*/
if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
ours = 1;
- in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
+ in6_ifstat_inc(rcvif, ifs6_in_mcast);
goto hbhcheck;
}
/*
@@ -834,7 +840,7 @@
*/
if (!V_ip6_forwarding) {
IP6STAT_INC(ip6s_cantforward);
- in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
+ in6_ifstat_inc(rcvif, ifs6_in_discard);
goto bad;
}
@@ -866,7 +872,7 @@
*/
if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
IP6STAT_INC(ip6s_tooshort);
- in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
+ in6_ifstat_inc(rcvif, ifs6_in_truncated);
goto bad;
}
if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
@@ -894,9 +900,9 @@
* unnecessarily calling into ip6_mforward().
*/
if (ip6_mforward &&
- ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
+ ip6_mforward(ip6, rcvif, m)) {
IP6STAT_INC(ip6s_cantforward);
- in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
+ in6_ifstat_inc(rcvif, ifs6_in_discard);
goto bad;
}
} else if (!ours) {
@@ -918,7 +924,7 @@
if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
IP6STAT_INC(ip6s_badscope);
- in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
+ in6_ifstat_inc(rcvif, ifs6_in_addrerr);
goto bad;
}
@@ -926,7 +932,7 @@
* Tell launch routine the next header
*/
IP6STAT_INC(ip6s_delivered);
- in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_deliver);
+ in6_ifstat_inc(rcvif, ifs6_in_deliver);
nest = 0;
while (nxt != IPPROTO_DONE) {
@@ -941,7 +947,7 @@
*/
if (m->m_pkthdr.len < off) {
IP6STAT_INC(ip6s_tooshort);
- in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
+ in6_ifstat_inc(rcvif, ifs6_in_truncated);
goto bad;
}
@@ -959,7 +965,9 @@
}
return;
bad:
- m_freem(m);
+ in6_ifstat_inc(rcvif, ifs6_in_discard);
+ if (m != NULL)
+ m_freem(m);
}
/*

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