diff --git a/sys/netinet6/ah_input.c b/sys/netinet6/ah_input.c index c4cc55667676..2b76d235babb 100644 --- a/sys/netinet6/ah_input.c +++ b/sys/netinet6/ah_input.c @@ -1,1052 +1,1054 @@ /* $FreeBSD$ */ /* $KAME: ah_input.c,v 1.59 2001/05/16 04:01:27 jinmei Exp $ */ /* * 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. */ /* * RFC1826/2402 authentication header. */ #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 #ifdef INET6 #include #endif #ifdef INET6 #include #include #include #include #include #include #endif #include #ifdef INET6 #include #endif #include #ifdef INET6 #include #endif #include #include #ifdef IPSEC_DEBUG #include #else #define KEYDEBUG(lev,arg) #endif #include #include #define IPLEN_FLIPPED #ifdef INET extern struct protosw inetsw[]; void ah4_input(m, off) struct mbuf *m; int off; { struct ip *ip; struct ah *ah; u_int32_t spi; const struct ah_algorithm *algo; size_t siz; size_t siz1; u_char *cksum; struct secasvar *sav = NULL; u_int16_t nxt; size_t hlen; int proto; size_t stripsiz = 0; #ifndef PULLDOWN_TEST if (m->m_len < off + sizeof(struct newah)) { m = m_pullup(m, off + sizeof(struct newah)); if (!m) { ipseclog((LOG_DEBUG, "IPv4 AH input: can't pullup;" "dropping the packet for simplicity\n")); ipsecstat.in_inval++; goto fail; } } ip = mtod(m, struct ip *); proto = ip->ip_p; ah = (struct ah *)(((caddr_t)ip) + off); #else ip = mtod(m, struct ip *); proto = ip->ip_p; IP6_EXTHDR_GET(ah, struct ah *, m, off, sizeof(struct newah)); if (ah == NULL) { ipseclog((LOG_DEBUG, "IPv4 AH input: can't pullup;" "dropping the packet for simplicity\n")); ipsecstat.in_inval++; goto fail; } #endif nxt = ah->ah_nxt; #ifdef _IP_VHL hlen = IP_VHL_HL(ip->ip_vhl) << 2; #else hlen = ip->ip_hl << 2; #endif /* find the sassoc. */ spi = ah->ah_spi; if ((sav = key_allocsa(AF_INET, (caddr_t)&ip->ip_src, (caddr_t)&ip->ip_dst, IPPROTO_AH, spi)) == 0) { ipseclog((LOG_WARNING, "IPv4 AH input: no key association found for spi %u\n", (u_int32_t)ntohl(spi))); ipsecstat.in_nosa++; goto fail; } KEYDEBUG(KEYDEBUG_IPSEC_STAMP, printf("DP ah4_input called to allocate SA:%p\n", sav)); if (sav->state != SADB_SASTATE_MATURE && sav->state != SADB_SASTATE_DYING) { ipseclog((LOG_DEBUG, "IPv4 AH input: non-mature/dying SA found for spi %u\n", (u_int32_t)ntohl(spi))); ipsecstat.in_badspi++; goto fail; } algo = ah_algorithm_lookup(sav->alg_auth); if (!algo) { ipseclog((LOG_DEBUG, "IPv4 AH input: " "unsupported authentication algorithm for spi %u\n", (u_int32_t)ntohl(spi))); ipsecstat.in_badspi++; goto fail; } siz = (*algo->sumsiz)(sav); siz1 = ((siz + 3) & ~(4 - 1)); /* * sanity checks for header, 1. */ { int sizoff; sizoff = (sav->flags & SADB_X_EXT_OLD) ? 0 : 4; /* * Here, we do not do "siz1 == siz". This is because the way * RFC240[34] section 2 is written. They do not require truncation * to 96 bits. * For example, Microsoft IPsec stack attaches 160 bits of * authentication data for both hmac-md5 and hmac-sha1. For hmac-sha1, * 32 bits of padding is attached. * * There are two downsides to this specification. * They have no real harm, however, they leave us fuzzy feeling. * - if we attach more than 96 bits of authentication data onto AH, * we will never notice about possible modification by rogue * intermediate nodes. * Since extra bits in AH checksum is never used, this constitutes * no real issue, however, it is wacky. * - even if the peer attaches big authentication data, we will never * notice the difference, since longer authentication data will just * work. * * We may need some clarification in the spec. */ if (siz1 < siz) { ipseclog((LOG_NOTICE, "sum length too short in IPv4 AH input " "(%lu, should be at least %lu): %s\n", (u_long)siz1, (u_long)siz, ipsec4_logpacketstr(ip, spi))); ipsecstat.in_inval++; goto fail; } if ((ah->ah_len << 2) - sizoff != siz1) { ipseclog((LOG_NOTICE, "sum length mismatch in IPv4 AH input " "(%d should be %lu): %s\n", (ah->ah_len << 2) - sizoff, (u_long)siz1, ipsec4_logpacketstr(ip, spi))); ipsecstat.in_inval++; goto fail; } #ifndef PULLDOWN_TEST if (m->m_len < off + sizeof(struct ah) + sizoff + siz1) { m = m_pullup(m, off + sizeof(struct ah) + sizoff + siz1); if (!m) { ipseclog((LOG_DEBUG, "IPv4 AH input: can't pullup\n")); ipsecstat.in_inval++; goto fail; } ip = mtod(m, struct ip *); ah = (struct ah *)(((caddr_t)ip) + off); } #else IP6_EXTHDR_GET(ah, struct ah *, m, off, sizeof(struct ah) + sizoff + siz1); if (ah == NULL) { ipseclog((LOG_DEBUG, "IPv4 AH input: can't pullup\n")); ipsecstat.in_inval++; goto fail; } #endif } /* * check for sequence number. */ if ((sav->flags & SADB_X_EXT_OLD) == 0 && sav->replay) { if (ipsec_chkreplay(ntohl(((struct newah *)ah)->ah_seq), sav)) ; /*okey*/ else { ipsecstat.in_ahreplay++; ipseclog((LOG_WARNING, "replay packet in IPv4 AH input: %s %s\n", ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav))); goto fail; } } /* * alright, it seems sane. now we are going to check the * cryptographic checksum. */ cksum = malloc(siz1, M_TEMP, M_NOWAIT); if (!cksum) { ipseclog((LOG_DEBUG, "IPv4 AH input: " "couldn't alloc temporary region for cksum\n")); ipsecstat.in_inval++; goto fail; } /* * some of IP header fields are flipped to the host endian. * convert them back to network endian. VERY stupid. */ ip->ip_len = htons(ip->ip_len + hlen); ip->ip_off = htons(ip->ip_off); if (ah4_calccksum(m, (caddr_t)cksum, siz1, algo, sav)) { free(cksum, M_TEMP); ipsecstat.in_inval++; goto fail; } ipsecstat.in_ahhist[sav->alg_auth]++; /* * flip them back. */ ip->ip_len = ntohs(ip->ip_len) - hlen; ip->ip_off = ntohs(ip->ip_off); { caddr_t sumpos = NULL; if (sav->flags & SADB_X_EXT_OLD) { /* RFC 1826 */ sumpos = (caddr_t)(ah + 1); } else { /* RFC 2402 */ sumpos = (caddr_t)(((struct newah *)ah) + 1); } if (bcmp(sumpos, cksum, siz) != 0) { ipseclog((LOG_WARNING, "checksum mismatch in IPv4 AH input: %s %s\n", ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav))); free(cksum, M_TEMP); ipsecstat.in_ahauthfail++; goto fail; } } free(cksum, M_TEMP); m->m_flags |= M_AUTHIPHDR; m->m_flags |= M_AUTHIPDGM; #if 0 /* * looks okey, but we need more sanity check. * XXX should elaborate. */ if (ah->ah_nxt == IPPROTO_IPIP || ah->ah_nxt == IPPROTO_IP) { struct ip *nip; size_t sizoff; sizoff = (sav->flags & SADB_X_EXT_OLD) ? 0 : 4; if (m->m_len < off + sizeof(struct ah) + sizoff + siz1 + hlen) { m = m_pullup(m, off + sizeof(struct ah) + sizoff + siz1 + hlen); if (!m) { ipseclog((LOG_DEBUG, "IPv4 AH input: can't pullup\n")); ipsecstat.in_inval++; goto fail; } } nip = (struct ip *)((u_char *)(ah + 1) + sizoff + siz1); if (nip->ip_src.s_addr != ip->ip_src.s_addr || nip->ip_dst.s_addr != ip->ip_dst.s_addr) { m->m_flags &= ~M_AUTHIPHDR; m->m_flags &= ~M_AUTHIPDGM; } } #ifdef INET6 else if (ah->ah_nxt == IPPROTO_IPV6) { m->m_flags &= ~M_AUTHIPHDR; m->m_flags &= ~M_AUTHIPDGM; } #endif /*INET6*/ #endif /*0*/ if (m->m_flags & M_AUTHIPHDR && m->m_flags & M_AUTHIPDGM) { #if 0 ipseclog((LOG_DEBUG, "IPv4 AH input: authentication succeess\n")); #endif ipsecstat.in_ahauthsucc++; } else { ipseclog((LOG_WARNING, "authentication failed in IPv4 AH input: %s %s\n", ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav))); ipsecstat.in_ahauthfail++; goto fail; } /* * update sequence number. */ if ((sav->flags & SADB_X_EXT_OLD) == 0 && sav->replay) { if (ipsec_updatereplay(ntohl(((struct newah *)ah)->ah_seq), sav)) { ipsecstat.in_ahreplay++; goto fail; } } /* was it transmitted over the IPsec tunnel SA? */ if (sav->flags & SADB_X_EXT_OLD) { /* RFC 1826 */ stripsiz = sizeof(struct ah) + siz1; } else { /* RFC 2402 */ stripsiz = sizeof(struct newah) + siz1; } if (ipsec4_tunnel_validate(m, off + stripsiz, nxt, sav)) { /* * strip off all the headers that precedes AH. * IP xx AH IP' payload -> IP' payload * * XXX more sanity checks * XXX relationship with gif? */ u_int8_t tos; tos = ip->ip_tos; m_adj(m, off + stripsiz); if (m->m_len < sizeof(*ip)) { m = m_pullup(m, sizeof(*ip)); if (!m) { ipsecstat.in_inval++; goto fail; } } ip = mtod(m, struct ip *); /* ECN consideration. */ ip_ecn_egress(ip4_ipsec_ecn, &tos, &ip->ip_tos); if (!key_checktunnelsanity(sav, AF_INET, (caddr_t)&ip->ip_src, (caddr_t)&ip->ip_dst)) { ipseclog((LOG_NOTICE, "ipsec tunnel address mismatch " "in IPv4 AH input: %s %s\n", ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav))); ipsecstat.in_inval++; goto fail; } #if 0 /* XXX should we call ipfw rather than ipsec_in_reject? */ /* drop it if it does not match the default policy */ if (ipsec4_in_reject(m, NULL)) { ipsecstat.in_polvio++; goto fail; } #endif #if 1 /* * Should the inner packet be considered authentic? * My current answer is: NO. * * host1 -- gw1 === gw2 -- host2 * In this case, gw2 can trust the authenticity of the * outer packet, but NOT inner. Packet may be altered * between host1 and gw1. * * host1 -- gw1 === host2 * This case falls into the same scenario as above. * * host1 === host2 * This case is the only case when we may be able to leave * M_AUTHIPHDR and M_AUTHIPDGM set. * However, if host1 is wrongly configured, and allows * attacker to inject some packet with src=host1 and * dst=host2, you are in risk. */ m->m_flags &= ~M_AUTHIPHDR; m->m_flags &= ~M_AUTHIPDGM; #endif key_sa_recordxfer(sav, m); if (ipsec_addhist(m, IPPROTO_AH, spi) != 0 || ipsec_addhist(m, IPPROTO_IPV4, 0) != 0) { ipsecstat.in_nomem++; goto fail; } if (! IF_HANDOFF(&ipintrq, m, NULL)) { ipsecstat.in_inval++; m = NULL; goto fail; } m = NULL; schednetisr(NETISR_IP); /*can be skipped but to make sure*/ nxt = IPPROTO_DONE; } else { /* * strip off AH. */ ip = mtod(m, struct ip *); #ifndef PULLDOWN_TEST /* * We do deep-copy since KAME requires that * the packet is placed in a single external mbuf. */ ovbcopy((caddr_t)ip, (caddr_t)(((u_char *)ip) + stripsiz), off); m->m_data += stripsiz; m->m_len -= stripsiz; m->m_pkthdr.len -= stripsiz; #else /* * even in m_pulldown case, we need to strip off AH so that * we can compute checksum for multiple AH correctly. */ if (m->m_len >= stripsiz + off) { ovbcopy((caddr_t)ip, ((caddr_t)ip) + stripsiz, off); m->m_data += stripsiz; m->m_len -= stripsiz; m->m_pkthdr.len -= stripsiz; } else { /* * this comes with no copy if the boundary is on * cluster */ struct mbuf *n; n = m_split(m, off, M_DONTWAIT); if (n == NULL) { /* m is retained by m_split */ goto fail; } m_adj(n, stripsiz); m_cat(m, n); /* m_cat does not update m_pkthdr.len */ m->m_pkthdr.len += n->m_pkthdr.len; } #endif if (m->m_len < sizeof(*ip)) { m = m_pullup(m, sizeof(*ip)); if (m == NULL) { ipsecstat.in_inval++; goto fail; } } ip = mtod(m, struct ip *); #ifdef IPLEN_FLIPPED ip->ip_len = ip->ip_len - stripsiz; #else ip->ip_len = htons(ntohs(ip->ip_len) - stripsiz); #endif ip->ip_p = nxt; /* forget about IP hdr checksum, the check has already been passed */ key_sa_recordxfer(sav, m); if (ipsec_addhist(m, IPPROTO_AH, spi) != 0) { ipsecstat.in_nomem++; goto fail; } if (nxt != IPPROTO_DONE) { if ((inetsw[ip_protox[nxt]].pr_flags & PR_LASTHDR) != 0 && ipsec4_in_reject(m, NULL)) { ipsecstat.in_polvio++; goto fail; } (*inetsw[ip_protox[nxt]].pr_input)(m, off); } else m_freem(m); m = NULL; } if (sav) { KEYDEBUG(KEYDEBUG_IPSEC_STAMP, printf("DP ah4_input call free SA:%p\n", sav)); key_freesav(sav); } ipsecstat.in_success++; return; fail: if (sav) { KEYDEBUG(KEYDEBUG_IPSEC_STAMP, printf("DP ah4_input call free SA:%p\n", sav)); key_freesav(sav); } if (m) m_freem(m); return; } #endif /* INET */ #ifdef INET6 int ah6_input(mp, offp, proto) struct mbuf **mp; int *offp, proto; { struct mbuf *m = *mp; int off = *offp; struct ip6_hdr *ip6; struct ah *ah; u_int32_t spi; const struct ah_algorithm *algo; size_t siz; size_t siz1; u_char *cksum; struct secasvar *sav = NULL; u_int16_t nxt; size_t stripsiz = 0; #ifndef PULLDOWN_TEST IP6_EXTHDR_CHECK(m, off, sizeof(struct ah), IPPROTO_DONE); ah = (struct ah *)(mtod(m, caddr_t) + off); #else IP6_EXTHDR_GET(ah, struct ah *, m, off, sizeof(struct newah)); if (ah == NULL) { ipseclog((LOG_DEBUG, "IPv6 AH input: can't pullup\n")); ipsec6stat.in_inval++; return IPPROTO_DONE; } #endif ip6 = mtod(m, struct ip6_hdr *); nxt = ah->ah_nxt; /* find the sassoc. */ spi = ah->ah_spi; if (ntohs(ip6->ip6_plen) == 0) { ipseclog((LOG_ERR, "IPv6 AH input: " "AH with IPv6 jumbogram is not supported.\n")); ipsec6stat.in_inval++; goto fail; } if ((sav = key_allocsa(AF_INET6, (caddr_t)&ip6->ip6_src, (caddr_t)&ip6->ip6_dst, IPPROTO_AH, spi)) == 0) { ipseclog((LOG_WARNING, "IPv6 AH input: no key association found for spi %u\n", (u_int32_t)ntohl(spi))); ipsec6stat.in_nosa++; goto fail; } KEYDEBUG(KEYDEBUG_IPSEC_STAMP, printf("DP ah6_input called to allocate SA:%p\n", sav)); if (sav->state != SADB_SASTATE_MATURE && sav->state != SADB_SASTATE_DYING) { ipseclog((LOG_DEBUG, "IPv6 AH input: non-mature/dying SA found for spi %u; ", (u_int32_t)ntohl(spi))); ipsec6stat.in_badspi++; goto fail; } algo = ah_algorithm_lookup(sav->alg_auth); if (!algo) { ipseclog((LOG_DEBUG, "IPv6 AH input: " "unsupported authentication algorithm for spi %u\n", (u_int32_t)ntohl(spi))); ipsec6stat.in_badspi++; goto fail; } siz = (*algo->sumsiz)(sav); siz1 = ((siz + 3) & ~(4 - 1)); /* * sanity checks for header, 1. */ { int sizoff; sizoff = (sav->flags & SADB_X_EXT_OLD) ? 0 : 4; /* * Here, we do not do "siz1 == siz". See ah4_input() for complete * description. */ if (siz1 < siz) { ipseclog((LOG_NOTICE, "sum length too short in IPv6 AH input " "(%lu, should be at least %lu): %s\n", (u_long)siz1, (u_long)siz, ipsec6_logpacketstr(ip6, spi))); ipsec6stat.in_inval++; goto fail; } if ((ah->ah_len << 2) - sizoff != siz1) { ipseclog((LOG_NOTICE, "sum length mismatch in IPv6 AH input " "(%d should be %lu): %s\n", (ah->ah_len << 2) - sizoff, (u_long)siz1, ipsec6_logpacketstr(ip6, spi))); ipsec6stat.in_inval++; goto fail; } #ifndef PULLDOWN_TEST IP6_EXTHDR_CHECK(m, off, sizeof(struct ah) + sizoff + siz1, IPPROTO_DONE); #else IP6_EXTHDR_GET(ah, struct ah *, m, off, sizeof(struct ah) + sizoff + siz1); if (ah == NULL) { ipseclog((LOG_NOTICE, "couldn't pullup gather IPv6 AH checksum part")); ipsec6stat.in_inval++; m = NULL; goto fail; } #endif } /* * check for sequence number. */ if ((sav->flags & SADB_X_EXT_OLD) == 0 && sav->replay) { if (ipsec_chkreplay(ntohl(((struct newah *)ah)->ah_seq), sav)) ; /*okey*/ else { ipsec6stat.in_ahreplay++; ipseclog((LOG_WARNING, "replay packet in IPv6 AH input: %s %s\n", ipsec6_logpacketstr(ip6, spi), ipsec_logsastr(sav))); goto fail; } } /* * alright, it seems sane. now we are going to check the * cryptographic checksum. */ cksum = malloc(siz1, M_TEMP, M_NOWAIT); if (!cksum) { ipseclog((LOG_DEBUG, "IPv6 AH input: " "couldn't alloc temporary region for cksum\n")); ipsec6stat.in_inval++; goto fail; } if (ah6_calccksum(m, (caddr_t)cksum, siz1, algo, sav)) { free(cksum, M_TEMP); ipsec6stat.in_inval++; goto fail; } ipsec6stat.in_ahhist[sav->alg_auth]++; { caddr_t sumpos = NULL; if (sav->flags & SADB_X_EXT_OLD) { /* RFC 1826 */ sumpos = (caddr_t)(ah + 1); } else { /* RFC 2402 */ sumpos = (caddr_t)(((struct newah *)ah) + 1); } if (bcmp(sumpos, cksum, siz) != 0) { ipseclog((LOG_WARNING, "checksum mismatch in IPv6 AH input: %s %s\n", ipsec6_logpacketstr(ip6, spi), ipsec_logsastr(sav))); free(cksum, M_TEMP); ipsec6stat.in_ahauthfail++; goto fail; } } free(cksum, M_TEMP); m->m_flags |= M_AUTHIPHDR; m->m_flags |= M_AUTHIPDGM; #if 0 /* * looks okey, but we need more sanity check. * XXX should elaborate. */ if (ah->ah_nxt == IPPROTO_IPV6) { struct ip6_hdr *nip6; size_t sizoff; sizoff = (sav->flags & SADB_X_EXT_OLD) ? 0 : 4; IP6_EXTHDR_CHECK(m, off, sizeof(struct ah) + sizoff + siz1 + sizeof(struct ip6_hdr), IPPROTO_DONE); nip6 = (struct ip6_hdr *)((u_char *)(ah + 1) + sizoff + siz1); if (!IN6_ARE_ADDR_EQUAL(&nip6->ip6_src, &ip6->ip6_src) || !IN6_ARE_ADDR_EQUAL(&nip6->ip6_dst, &ip6->ip6_dst)) { m->m_flags &= ~M_AUTHIPHDR; m->m_flags &= ~M_AUTHIPDGM; } } else if (ah->ah_nxt == IPPROTO_IPIP) { m->m_flags &= ~M_AUTHIPHDR; m->m_flags &= ~M_AUTHIPDGM; } else if (ah->ah_nxt == IPPROTO_IP) { m->m_flags &= ~M_AUTHIPHDR; m->m_flags &= ~M_AUTHIPDGM; } #endif if (m->m_flags & M_AUTHIPHDR && m->m_flags & M_AUTHIPDGM) { #if 0 ipseclog((LOG_DEBUG, "IPv6 AH input: authentication succeess\n")); #endif ipsec6stat.in_ahauthsucc++; } else { ipseclog((LOG_WARNING, "authentication failed in IPv6 AH input: %s %s\n", ipsec6_logpacketstr(ip6, spi), ipsec_logsastr(sav))); ipsec6stat.in_ahauthfail++; goto fail; } /* * update sequence number. */ if ((sav->flags & SADB_X_EXT_OLD) == 0 && sav->replay) { if (ipsec_updatereplay(ntohl(((struct newah *)ah)->ah_seq), sav)) { ipsec6stat.in_ahreplay++; goto fail; } } /* was it transmitted over the IPsec tunnel SA? */ if (sav->flags & SADB_X_EXT_OLD) { /* RFC 1826 */ stripsiz = sizeof(struct ah) + siz1; } else { /* RFC 2402 */ stripsiz = sizeof(struct newah) + siz1; } if (ipsec6_tunnel_validate(m, off + stripsiz, nxt, sav)) { /* * strip off all the headers that precedes AH. * IP6 xx AH IP6' payload -> IP6' payload * * XXX more sanity checks * XXX relationship with gif? */ u_int32_t flowinfo; /*net endian*/ flowinfo = ip6->ip6_flow; m_adj(m, off + stripsiz); if (m->m_len < sizeof(*ip6)) { /* * m_pullup is prohibited in KAME IPv6 input processing * but there's no other way! */ m = m_pullup(m, sizeof(*ip6)); if (!m) { ipsec6stat.in_inval++; goto fail; } } ip6 = mtod(m, struct ip6_hdr *); /* ECN consideration. */ ip6_ecn_egress(ip6_ipsec_ecn, &flowinfo, &ip6->ip6_flow); if (!key_checktunnelsanity(sav, AF_INET6, (caddr_t)&ip6->ip6_src, (caddr_t)&ip6->ip6_dst)) { ipseclog((LOG_NOTICE, "ipsec tunnel address mismatch " "in IPv6 AH input: %s %s\n", ipsec6_logpacketstr(ip6, spi), ipsec_logsastr(sav))); ipsec6stat.in_inval++; goto fail; } #if 0 /* XXX should we call ipfw rather than ipsec_in_reject? */ /* drop it if it does not match the default policy */ if (ipsec6_in_reject(m, NULL)) { ipsec6stat.in_polvio++; goto fail; } #endif #if 1 /* * should the inner packet be considered authentic? * see comment in ah4_input(). */ m->m_flags &= ~M_AUTHIPHDR; m->m_flags &= ~M_AUTHIPDGM; #endif key_sa_recordxfer(sav, m); if (ipsec_addhist(m, IPPROTO_AH, spi) != 0 || ipsec_addhist(m, IPPROTO_IPV6, 0) != 0) { ipsec6stat.in_nomem++; goto fail; } if (! IF_HANDOFF(&ip6intrq, m, NULL)) { ipsec6stat.in_inval++; m = NULL; goto fail; } m = NULL; schednetisr(NETISR_IPV6); /*can be skipped but to make sure*/ nxt = IPPROTO_DONE; } else { /* * strip off AH. */ char *prvnxtp; /* * Copy the value of the next header field of AH to the * next header field of the previous header. * This is necessary because AH will be stripped off below. */ prvnxtp = ip6_get_prevhdr(m, off); /* XXX */ *prvnxtp = nxt; ip6 = mtod(m, struct ip6_hdr *); #ifndef PULLDOWN_TEST /* * We do deep-copy since KAME requires that * the packet is placed in a single mbuf. */ ovbcopy((caddr_t)ip6, ((caddr_t)ip6) + stripsiz, off); m->m_data += stripsiz; m->m_len -= stripsiz; m->m_pkthdr.len -= stripsiz; #else /* * even in m_pulldown case, we need to strip off AH so that * we can compute checksum for multiple AH correctly. */ if (m->m_len >= stripsiz + off) { ovbcopy((caddr_t)ip6, ((caddr_t)ip6) + stripsiz, off); m->m_data += stripsiz; m->m_len -= stripsiz; m->m_pkthdr.len -= stripsiz; } else { /* * this comes with no copy if the boundary is on * cluster */ struct mbuf *n; n = m_split(m, off, M_DONTWAIT); if (n == NULL) { /* m is retained by m_split */ goto fail; } m_adj(n, stripsiz); m_cat(m, n); /* m_cat does not update m_pkthdr.len */ m->m_pkthdr.len += n->m_pkthdr.len; } #endif ip6 = mtod(m, struct ip6_hdr *); /* XXX jumbogram */ ip6->ip6_plen = htons(ntohs(ip6->ip6_plen) - stripsiz); key_sa_recordxfer(sav, m); if (ipsec_addhist(m, IPPROTO_AH, spi) != 0) { ipsec6stat.in_nomem++; goto fail; } } *offp = off; *mp = m; if (sav) { KEYDEBUG(KEYDEBUG_IPSEC_STAMP, printf("DP ah6_input call free SA:%p\n", sav)); key_freesav(sav); } ipsec6stat.in_success++; return nxt; fail: if (sav) { KEYDEBUG(KEYDEBUG_IPSEC_STAMP, printf("DP ah6_input call free SA:%p\n", sav)); key_freesav(sav); } if (m) m_freem(m); return IPPROTO_DONE; } void ah6_ctlinput(cmd, sa, d) int cmd; struct sockaddr *sa; void *d; { const struct newah *ahp; struct newah ah; struct secasvar *sav; struct ip6_hdr *ip6; struct mbuf *m; struct ip6ctlparam *ip6cp = NULL; int off; - struct sockaddr_in6 sa6_src, sa6_dst; + struct sockaddr_in6 *sa6_src, *sa6_dst; if (sa->sa_family != AF_INET6 || sa->sa_len != sizeof(struct sockaddr_in6)) return; if ((unsigned)cmd >= PRC_NCMDS) return; /* if the parameter is from icmp6, decode it. */ if (d != NULL) { ip6cp = (struct ip6ctlparam *)d; m = ip6cp->ip6c_m; ip6 = ip6cp->ip6c_ip6; off = ip6cp->ip6c_off; } else { m = NULL; ip6 = NULL; off = 0; /* calm gcc */ } if (ip6) { /* * XXX: We assume that when ip6 is non NULL, * M and OFF are valid. */ /* check if we can safely examine src and dst ports */ if (m->m_pkthdr.len < off + sizeof(ah)) return; if (m->m_len < off + sizeof(ah)) { /* * this should be rare case, * so we compromise on this copy... */ m_copydata(m, off, sizeof(ah), (caddr_t)&ah); ahp = &ah; } else ahp = (struct newah *)(mtod(m, caddr_t) + off); if (cmd == PRC_MSGSIZE) { int valid = 0; /* * Check to see if we have a valid SA corresponding to * the address in the ICMP message payload. */ + sa6_src = ip6cp->ip6c_src; + sa6_dst = (struct sockaddr_in6 *)sa; sav = key_allocsa(AF_INET6, - (caddr_t)&sa6_src.sin6_addr, - (caddr_t)&sa6_dst.sin6_addr, + (caddr_t)&sa6_src->sin6_addr, + (caddr_t)&sa6_dst->sin6_addr, IPPROTO_AH, ahp->ah_spi); if (sav) { if (sav->state == SADB_SASTATE_MATURE || sav->state == SADB_SASTATE_DYING) valid++; key_freesav(sav); } /* XXX Further validation? */ /* * Depending on the value of "valid" and routing table * size (mtudisc_{hi,lo}wat), we will: * - recalcurate the new MTU and create the * corresponding routing entry, or * - ignore the MTU change notification. */ icmp6_mtudisc_update((struct ip6ctlparam *)d, valid); } /* we normally notify single pcb here */ } else { /* we normally notify any pcb here */ } } #endif /* INET6 */ diff --git a/sys/netinet6/esp_input.c b/sys/netinet6/esp_input.c index 74e6830128f5..6a66450c87b1 100644 --- a/sys/netinet6/esp_input.c +++ b/sys/netinet6/esp_input.c @@ -1,992 +1,994 @@ /* $FreeBSD$ */ /* $KAME: esp_input.c,v 1.55 2001/03/23 08:08:47 itojun Exp $ */ /* * 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. */ /* * RFC1827/2406 Encapsulated Security Payload. */ #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 #ifdef INET6 #include #endif #ifdef INET6 #include #include #include #include #include #include #endif #include #ifdef INET6 #include #endif #include #ifdef INET6 #include #endif #include #ifdef INET6 #include #endif #include #include #include #include #include #define IPLEN_FLIPPED #define ESPMAXLEN \ (sizeof(struct esp) < sizeof(struct newesp) \ ? sizeof(struct newesp) : sizeof(struct esp)) #ifdef INET extern struct protosw inetsw[]; void esp4_input(m, off) struct mbuf *m; int off; { struct ip *ip; struct esp *esp; struct esptail esptail; u_int32_t spi; struct secasvar *sav = NULL; size_t taillen; u_int16_t nxt; const struct esp_algorithm *algo; int ivlen; size_t hlen; size_t esplen; int proto; /* sanity check for alignment. */ if (off % 4 != 0 || m->m_pkthdr.len % 4 != 0) { ipseclog((LOG_ERR, "IPv4 ESP input: packet alignment problem " "(off=%d, pktlen=%d)\n", off, m->m_pkthdr.len)); ipsecstat.in_inval++; goto bad; } if (m->m_len < off + ESPMAXLEN) { m = m_pullup(m, off + ESPMAXLEN); if (!m) { ipseclog((LOG_DEBUG, "IPv4 ESP input: can't pullup in esp4_input\n")); ipsecstat.in_inval++; goto bad; } } ip = mtod(m, struct ip *); proto = ip->ip_p; esp = (struct esp *)(((u_int8_t *)ip) + off); #ifdef _IP_VHL hlen = IP_VHL_HL(ip->ip_vhl) << 2; #else hlen = ip->ip_hl << 2; #endif /* find the sassoc. */ spi = esp->esp_spi; if ((sav = key_allocsa(AF_INET, (caddr_t)&ip->ip_src, (caddr_t)&ip->ip_dst, IPPROTO_ESP, spi)) == 0) { ipseclog((LOG_WARNING, "IPv4 ESP input: no key association found for spi %u\n", (u_int32_t)ntohl(spi))); ipsecstat.in_nosa++; goto bad; } KEYDEBUG(KEYDEBUG_IPSEC_STAMP, printf("DP esp4_input called to allocate SA:%p\n", sav)); if (sav->state != SADB_SASTATE_MATURE && sav->state != SADB_SASTATE_DYING) { ipseclog((LOG_DEBUG, "IPv4 ESP input: non-mature/dying SA found for spi %u\n", (u_int32_t)ntohl(spi))); ipsecstat.in_badspi++; goto bad; } algo = esp_algorithm_lookup(sav->alg_enc); if (!algo) { ipseclog((LOG_DEBUG, "IPv4 ESP input: " "unsupported encryption algorithm for spi %u\n", (u_int32_t)ntohl(spi))); ipsecstat.in_badspi++; goto bad; } /* check if we have proper ivlen information */ ivlen = sav->ivlen; if (ivlen < 0) { ipseclog((LOG_ERR, "inproper ivlen in IPv4 ESP input: %s %s\n", ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav))); ipsecstat.in_inval++; goto bad; } if (!((sav->flags & SADB_X_EXT_OLD) == 0 && sav->replay && (sav->alg_auth && sav->key_auth))) goto noreplaycheck; if (sav->alg_auth == SADB_X_AALG_NULL || sav->alg_auth == SADB_AALG_NONE) goto noreplaycheck; /* * check for sequence number. */ if (ipsec_chkreplay(ntohl(((struct newesp *)esp)->esp_seq), sav)) ; /*okey*/ else { ipsecstat.in_espreplay++; ipseclog((LOG_WARNING, "replay packet in IPv4 ESP input: %s %s\n", ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav))); goto bad; } /* check ICV */ { u_char sum0[AH_MAXSUMSIZE]; u_char sum[AH_MAXSUMSIZE]; const struct ah_algorithm *sumalgo; size_t siz; sumalgo = ah_algorithm_lookup(sav->alg_auth); if (!sumalgo) goto noreplaycheck; siz = (((*sumalgo->sumsiz)(sav) + 3) & ~(4 - 1)); if (AH_MAXSUMSIZE < siz) { ipseclog((LOG_DEBUG, "internal error: AH_MAXSUMSIZE must be larger than %lu\n", (u_long)siz)); ipsecstat.in_inval++; goto bad; } m_copydata(m, m->m_pkthdr.len - siz, siz, &sum0[0]); if (esp_auth(m, off, m->m_pkthdr.len - off - siz, sav, sum)) { ipseclog((LOG_WARNING, "auth fail in IPv4 ESP input: %s %s\n", ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav))); ipsecstat.in_espauthfail++; goto bad; } if (bcmp(sum0, sum, siz) != 0) { ipseclog((LOG_WARNING, "auth fail in IPv4 ESP input: %s %s\n", ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav))); ipsecstat.in_espauthfail++; goto bad; } /* strip off the authentication data */ m_adj(m, -siz); ip = mtod(m, struct ip *); #ifdef IPLEN_FLIPPED ip->ip_len = ip->ip_len - siz; #else ip->ip_len = htons(ntohs(ip->ip_len) - siz); #endif m->m_flags |= M_AUTHIPDGM; ipsecstat.in_espauthsucc++; } /* * update sequence number. */ if ((sav->flags & SADB_X_EXT_OLD) == 0 && sav->replay) { if (ipsec_updatereplay(ntohl(((struct newesp *)esp)->esp_seq), sav)) { ipsecstat.in_espreplay++; goto bad; } } noreplaycheck: /* process main esp header. */ if (sav->flags & SADB_X_EXT_OLD) { /* RFC 1827 */ esplen = sizeof(struct esp); } else { /* RFC 2406 */ if (sav->flags & SADB_X_EXT_DERIV) esplen = sizeof(struct esp); else esplen = sizeof(struct newesp); } if (m->m_pkthdr.len < off + esplen + ivlen + sizeof(esptail)) { ipseclog((LOG_WARNING, "IPv4 ESP input: packet too short\n")); ipsecstat.in_inval++; goto bad; } if (m->m_len < off + esplen + ivlen) { m = m_pullup(m, off + esplen + ivlen); if (!m) { ipseclog((LOG_DEBUG, "IPv4 ESP input: can't pullup in esp4_input\n")); ipsecstat.in_inval++; goto bad; } } /* * pre-compute and cache intermediate key */ if (esp_schedule(algo, sav) != 0) { ipsecstat.in_inval++; goto bad; } /* * decrypt the packet. */ if (!algo->decrypt) panic("internal error: no decrypt function"); if ((*algo->decrypt)(m, off, sav, algo, ivlen)) { /* m is already freed */ m = NULL; ipseclog((LOG_ERR, "decrypt fail in IPv4 ESP input: %s\n", ipsec_logsastr(sav))); ipsecstat.in_inval++; goto bad; } ipsecstat.in_esphist[sav->alg_enc]++; m->m_flags |= M_DECRYPTED; /* * find the trailer of the ESP. */ m_copydata(m, m->m_pkthdr.len - sizeof(esptail), sizeof(esptail), (caddr_t)&esptail); nxt = esptail.esp_nxt; taillen = esptail.esp_padlen + sizeof(esptail); if (m->m_pkthdr.len < taillen || m->m_pkthdr.len - taillen < hlen) { /*?*/ ipseclog((LOG_WARNING, "bad pad length in IPv4 ESP input: %s %s\n", ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav))); ipsecstat.in_inval++; goto bad; } /* strip off the trailing pad area. */ m_adj(m, -taillen); #ifdef IPLEN_FLIPPED ip->ip_len = ip->ip_len - taillen; #else ip->ip_len = htons(ntohs(ip->ip_len) - taillen); #endif /* was it transmitted over the IPsec tunnel SA? */ if (ipsec4_tunnel_validate(m, off + esplen + ivlen, nxt, sav)) { /* * strip off all the headers that precedes ESP header. * IP4 xx ESP IP4' payload -> IP4' payload * * XXX more sanity checks * XXX relationship with gif? */ u_int8_t tos; tos = ip->ip_tos; m_adj(m, off + esplen + ivlen); if (m->m_len < sizeof(*ip)) { m = m_pullup(m, sizeof(*ip)); if (!m) { ipsecstat.in_inval++; goto bad; } } ip = mtod(m, struct ip *); /* ECN consideration. */ ip_ecn_egress(ip4_ipsec_ecn, &tos, &ip->ip_tos); if (!key_checktunnelsanity(sav, AF_INET, (caddr_t)&ip->ip_src, (caddr_t)&ip->ip_dst)) { ipseclog((LOG_ERR, "ipsec tunnel address mismatch " "in IPv4 ESP input: %s %s\n", ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav))); ipsecstat.in_inval++; goto bad; } #if 0 /* XXX should call ipfw rather than ipsec_in_reject, shouldn't it ? */ /* drop it if it does not match the default policy */ if (ipsec4_in_reject(m, NULL)) { ipsecstat.in_polvio++; goto bad; } #endif key_sa_recordxfer(sav, m); if (ipsec_addhist(m, IPPROTO_ESP, spi) != 0 || ipsec_addhist(m, IPPROTO_IPV4, 0) != 0) { ipsecstat.in_nomem++; goto bad; } if (! IF_HANDOFF(&ipintrq, m, NULL)) { ipsecstat.in_inval++; m = NULL; goto bad; } m = NULL; schednetisr(NETISR_IP); /*can be skipped but to make sure*/ nxt = IPPROTO_DONE; } else { /* * strip off ESP header and IV. * even in m_pulldown case, we need to strip off ESP so that * we can always compute checksum for AH correctly. */ size_t stripsiz; stripsiz = esplen + ivlen; ip = mtod(m, struct ip *); ovbcopy((caddr_t)ip, (caddr_t)(((u_char *)ip) + stripsiz), off); m->m_data += stripsiz; m->m_len -= stripsiz; m->m_pkthdr.len -= stripsiz; ip = mtod(m, struct ip *); #ifdef IPLEN_FLIPPED ip->ip_len = ip->ip_len - stripsiz; #else ip->ip_len = htons(ntohs(ip->ip_len) - stripsiz); #endif ip->ip_p = nxt; key_sa_recordxfer(sav, m); if (ipsec_addhist(m, IPPROTO_ESP, spi) != 0) { ipsecstat.in_nomem++; goto bad; } if (nxt != IPPROTO_DONE) { if ((inetsw[ip_protox[nxt]].pr_flags & PR_LASTHDR) != 0 && ipsec4_in_reject(m, NULL)) { ipsecstat.in_polvio++; goto bad; } (*inetsw[ip_protox[nxt]].pr_input)(m, off); } else m_freem(m); m = NULL; } if (sav) { KEYDEBUG(KEYDEBUG_IPSEC_STAMP, printf("DP esp4_input call free SA:%p\n", sav)); key_freesav(sav); } ipsecstat.in_success++; return; bad: if (sav) { KEYDEBUG(KEYDEBUG_IPSEC_STAMP, printf("DP esp4_input call free SA:%p\n", sav)); key_freesav(sav); } if (m) m_freem(m); return; } #endif /* INET */ #ifdef INET6 int esp6_input(mp, offp, proto) struct mbuf **mp; int *offp, proto; { struct mbuf *m = *mp; int off = *offp; struct ip6_hdr *ip6; struct esp *esp; struct esptail esptail; u_int32_t spi; struct secasvar *sav = NULL; size_t taillen; u_int16_t nxt; const struct esp_algorithm *algo; int ivlen; size_t esplen; /* sanity check for alignment. */ if (off % 4 != 0 || m->m_pkthdr.len % 4 != 0) { ipseclog((LOG_ERR, "IPv6 ESP input: packet alignment problem " "(off=%d, pktlen=%d)\n", off, m->m_pkthdr.len)); ipsec6stat.in_inval++; goto bad; } #ifndef PULLDOWN_TEST IP6_EXTHDR_CHECK(m, off, ESPMAXLEN, IPPROTO_DONE); esp = (struct esp *)(mtod(m, caddr_t) + off); #else IP6_EXTHDR_GET(esp, struct esp *, m, off, ESPMAXLEN); if (esp == NULL) { ipsec6stat.in_inval++; return IPPROTO_DONE; } #endif ip6 = mtod(m, struct ip6_hdr *); if (ntohs(ip6->ip6_plen) == 0) { ipseclog((LOG_ERR, "IPv6 ESP input: " "ESP with IPv6 jumbogram is not supported.\n")); ipsec6stat.in_inval++; goto bad; } /* find the sassoc. */ spi = esp->esp_spi; if ((sav = key_allocsa(AF_INET6, (caddr_t)&ip6->ip6_src, (caddr_t)&ip6->ip6_dst, IPPROTO_ESP, spi)) == 0) { ipseclog((LOG_WARNING, "IPv6 ESP input: no key association found for spi %u\n", (u_int32_t)ntohl(spi))); ipsec6stat.in_nosa++; goto bad; } KEYDEBUG(KEYDEBUG_IPSEC_STAMP, printf("DP esp6_input called to allocate SA:%p\n", sav)); if (sav->state != SADB_SASTATE_MATURE && sav->state != SADB_SASTATE_DYING) { ipseclog((LOG_DEBUG, "IPv6 ESP input: non-mature/dying SA found for spi %u\n", (u_int32_t)ntohl(spi))); ipsec6stat.in_badspi++; goto bad; } algo = esp_algorithm_lookup(sav->alg_enc); if (!algo) { ipseclog((LOG_DEBUG, "IPv6 ESP input: " "unsupported encryption algorithm for spi %u\n", (u_int32_t)ntohl(spi))); ipsec6stat.in_badspi++; goto bad; } /* check if we have proper ivlen information */ ivlen = sav->ivlen; if (ivlen < 0) { ipseclog((LOG_ERR, "inproper ivlen in IPv6 ESP input: %s %s\n", ipsec6_logpacketstr(ip6, spi), ipsec_logsastr(sav))); ipsec6stat.in_badspi++; goto bad; } if (!((sav->flags & SADB_X_EXT_OLD) == 0 && sav->replay && (sav->alg_auth && sav->key_auth))) goto noreplaycheck; if (sav->alg_auth == SADB_X_AALG_NULL || sav->alg_auth == SADB_AALG_NONE) goto noreplaycheck; /* * check for sequence number. */ if (ipsec_chkreplay(ntohl(((struct newesp *)esp)->esp_seq), sav)) ; /*okey*/ else { ipsec6stat.in_espreplay++; ipseclog((LOG_WARNING, "replay packet in IPv6 ESP input: %s %s\n", ipsec6_logpacketstr(ip6, spi), ipsec_logsastr(sav))); goto bad; } /* check ICV */ { u_char sum0[AH_MAXSUMSIZE]; u_char sum[AH_MAXSUMSIZE]; const struct ah_algorithm *sumalgo; size_t siz; sumalgo = ah_algorithm_lookup(sav->alg_auth); if (!sumalgo) goto noreplaycheck; siz = (((*sumalgo->sumsiz)(sav) + 3) & ~(4 - 1)); if (AH_MAXSUMSIZE < siz) { ipseclog((LOG_DEBUG, "internal error: AH_MAXSUMSIZE must be larger than %lu\n", (u_long)siz)); ipsec6stat.in_inval++; goto bad; } m_copydata(m, m->m_pkthdr.len - siz, siz, &sum0[0]); if (esp_auth(m, off, m->m_pkthdr.len - off - siz, sav, sum)) { ipseclog((LOG_WARNING, "auth fail in IPv6 ESP input: %s %s\n", ipsec6_logpacketstr(ip6, spi), ipsec_logsastr(sav))); ipsec6stat.in_espauthfail++; goto bad; } if (bcmp(sum0, sum, siz) != 0) { ipseclog((LOG_WARNING, "auth fail in IPv6 ESP input: %s %s\n", ipsec6_logpacketstr(ip6, spi), ipsec_logsastr(sav))); ipsec6stat.in_espauthfail++; goto bad; } /* strip off the authentication data */ m_adj(m, -siz); ip6 = mtod(m, struct ip6_hdr *); ip6->ip6_plen = htons(ntohs(ip6->ip6_plen) - siz); m->m_flags |= M_AUTHIPDGM; ipsec6stat.in_espauthsucc++; } /* * update sequence number. */ if ((sav->flags & SADB_X_EXT_OLD) == 0 && sav->replay) { if (ipsec_updatereplay(ntohl(((struct newesp *)esp)->esp_seq), sav)) { ipsec6stat.in_espreplay++; goto bad; } } noreplaycheck: /* process main esp header. */ if (sav->flags & SADB_X_EXT_OLD) { /* RFC 1827 */ esplen = sizeof(struct esp); } else { /* RFC 2406 */ if (sav->flags & SADB_X_EXT_DERIV) esplen = sizeof(struct esp); else esplen = sizeof(struct newesp); } if (m->m_pkthdr.len < off + esplen + ivlen + sizeof(esptail)) { ipseclog((LOG_WARNING, "IPv6 ESP input: packet too short\n")); ipsec6stat.in_inval++; goto bad; } #ifndef PULLDOWN_TEST IP6_EXTHDR_CHECK(m, off, esplen + ivlen, IPPROTO_DONE); /*XXX*/ #else IP6_EXTHDR_GET(esp, struct esp *, m, off, esplen + ivlen); if (esp == NULL) { ipsec6stat.in_inval++; m = NULL; goto bad; } #endif ip6 = mtod(m, struct ip6_hdr *); /*set it again just in case*/ /* * pre-compute and cache intermediate key */ if (esp_schedule(algo, sav) != 0) { ipsec6stat.in_inval++; goto bad; } /* * decrypt the packet. */ if (!algo->decrypt) panic("internal error: no decrypt function"); if ((*algo->decrypt)(m, off, sav, algo, ivlen)) { /* m is already freed */ m = NULL; ipseclog((LOG_ERR, "decrypt fail in IPv6 ESP input: %s\n", ipsec_logsastr(sav))); ipsec6stat.in_inval++; goto bad; } ipsec6stat.in_esphist[sav->alg_enc]++; m->m_flags |= M_DECRYPTED; /* * find the trailer of the ESP. */ m_copydata(m, m->m_pkthdr.len - sizeof(esptail), sizeof(esptail), (caddr_t)&esptail); nxt = esptail.esp_nxt; taillen = esptail.esp_padlen + sizeof(esptail); if (m->m_pkthdr.len < taillen || m->m_pkthdr.len - taillen < sizeof(struct ip6_hdr)) { /*?*/ ipseclog((LOG_WARNING, "bad pad length in IPv6 ESP input: %s %s\n", ipsec6_logpacketstr(ip6, spi), ipsec_logsastr(sav))); ipsec6stat.in_inval++; goto bad; } /* strip off the trailing pad area. */ m_adj(m, -taillen); ip6->ip6_plen = htons(ntohs(ip6->ip6_plen) - taillen); /* was it transmitted over the IPsec tunnel SA? */ if (ipsec6_tunnel_validate(m, off + esplen + ivlen, nxt, sav)) { /* * strip off all the headers that precedes ESP header. * IP6 xx ESP IP6' payload -> IP6' payload * * XXX more sanity checks * XXX relationship with gif? */ u_int32_t flowinfo; /*net endian*/ flowinfo = ip6->ip6_flow; m_adj(m, off + esplen + ivlen); if (m->m_len < sizeof(*ip6)) { #ifndef PULLDOWN_TEST /* * m_pullup is prohibited in KAME IPv6 input processing * but there's no other way! */ #else /* okay to pullup in m_pulldown style */ #endif m = m_pullup(m, sizeof(*ip6)); if (!m) { ipsec6stat.in_inval++; goto bad; } } ip6 = mtod(m, struct ip6_hdr *); /* ECN consideration. */ ip6_ecn_egress(ip6_ipsec_ecn, &flowinfo, &ip6->ip6_flow); if (!key_checktunnelsanity(sav, AF_INET6, (caddr_t)&ip6->ip6_src, (caddr_t)&ip6->ip6_dst)) { ipseclog((LOG_ERR, "ipsec tunnel address mismatch " "in IPv6 ESP input: %s %s\n", ipsec6_logpacketstr(ip6, spi), ipsec_logsastr(sav))); ipsec6stat.in_inval++; goto bad; } #if 0 /* XXX should call ipfw rather than ipsec_in_reject, shouldn't it ? */ /* drop it if it does not match the default policy */ if (ipsec6_in_reject(m, NULL)) { ipsec6stat.in_polvio++; goto bad; } #endif key_sa_recordxfer(sav, m); if (ipsec_addhist(m, IPPROTO_ESP, spi) != 0 || ipsec_addhist(m, IPPROTO_IPV6, 0) != 0) { ipsec6stat.in_nomem++; goto bad; } if (! IF_HANDOFF(&ip6intrq, m, NULL)) { ipsec6stat.in_inval++; m = NULL; goto bad; } m = NULL; schednetisr(NETISR_IPV6); /*can be skipped but to make sure*/ nxt = IPPROTO_DONE; } else { /* * strip off ESP header and IV. * even in m_pulldown case, we need to strip off ESP so that * we can always compute checksum for AH correctly. */ size_t stripsiz; char *prvnxtp; /* * Set the next header field of the previous header correctly. */ prvnxtp = ip6_get_prevhdr(m, off); /* XXX */ *prvnxtp = nxt; stripsiz = esplen + ivlen; ip6 = mtod(m, struct ip6_hdr *); if (m->m_len >= stripsiz + off) { ovbcopy((caddr_t)ip6, ((caddr_t)ip6) + stripsiz, off); m->m_data += stripsiz; m->m_len -= stripsiz; m->m_pkthdr.len -= stripsiz; } else { /* * this comes with no copy if the boundary is on * cluster */ struct mbuf *n; n = m_split(m, off, M_DONTWAIT); if (n == NULL) { /* m is retained by m_split */ goto bad; } m_adj(n, stripsiz); m_cat(m, n); /* m_cat does not update m_pkthdr.len */ m->m_pkthdr.len += n->m_pkthdr.len; } #ifndef PULLDOWN_TEST /* * KAME requires that the packet to be contiguous on the * mbuf. We need to make that sure. * this kind of code should be avoided. * XXX other conditions to avoid running this part? */ if (m->m_len != m->m_pkthdr.len) { struct mbuf *n = NULL; int maxlen; MGETHDR(n, M_DONTWAIT, MT_HEADER); maxlen = MHLEN; if (n) M_COPY_PKTHDR(n, m); if (n && m->m_pkthdr.len > maxlen) { MCLGET(n, M_DONTWAIT); maxlen = MCLBYTES; if ((n->m_flags & M_EXT) == 0) { m_free(n); n = NULL; } } if (!n) { printf("esp6_input: mbuf allocation failed\n"); goto bad; } if (m->m_pkthdr.len <= maxlen) { m_copydata(m, 0, m->m_pkthdr.len, mtod(n, caddr_t)); n->m_len = m->m_pkthdr.len; n->m_pkthdr.len = m->m_pkthdr.len; n->m_next = NULL; m_freem(m); } else { m_copydata(m, 0, maxlen, mtod(n, caddr_t)); m_adj(m, maxlen); n->m_len = maxlen; n->m_pkthdr.len = m->m_pkthdr.len; n->m_next = m; m->m_flags &= ~M_PKTHDR; } m = n; } #endif ip6 = mtod(m, struct ip6_hdr *); ip6->ip6_plen = htons(ntohs(ip6->ip6_plen) - stripsiz); key_sa_recordxfer(sav, m); if (ipsec_addhist(m, IPPROTO_ESP, spi) != 0) { ipsec6stat.in_nomem++; goto bad; } } *offp = off; *mp = m; if (sav) { KEYDEBUG(KEYDEBUG_IPSEC_STAMP, printf("DP esp6_input call free SA:%p\n", sav)); key_freesav(sav); } ipsec6stat.in_success++; return nxt; bad: if (sav) { KEYDEBUG(KEYDEBUG_IPSEC_STAMP, printf("DP esp6_input call free SA:%p\n", sav)); key_freesav(sav); } if (m) m_freem(m); return IPPROTO_DONE; } void esp6_ctlinput(cmd, sa, d) int cmd; struct sockaddr *sa; void *d; { const struct newesp *espp; struct newesp esp; struct ip6ctlparam *ip6cp = NULL, ip6cp1; struct secasvar *sav; struct ip6_hdr *ip6; struct mbuf *m; int off; - struct sockaddr_in6 sa6_src, sa6_dst; + struct sockaddr_in6 *sa6_src, *sa6_dst; if (sa->sa_family != AF_INET6 || sa->sa_len != sizeof(struct sockaddr_in6)) return; if ((unsigned)cmd >= PRC_NCMDS) return; /* if the parameter is from icmp6, decode it. */ if (d != NULL) { ip6cp = (struct ip6ctlparam *)d; m = ip6cp->ip6c_m; ip6 = ip6cp->ip6c_ip6; off = ip6cp->ip6c_off; } else { m = NULL; ip6 = NULL; off = 0; /* calm gcc */ } if (ip6) { /* * Notify the error to all possible sockets via pfctlinput2. * Since the upper layer information (such as protocol type, * source and destination ports) is embedded in the encrypted * data and might have been cut, we can't directly call * an upper layer ctlinput function. However, the pcbnotify * function will consider source and destination addresses * as well as the flow info value, and may be able to find * some PCB that should be notified. * Although pfctlinput2 will call esp6_ctlinput(), there is * no possibility of an infinite loop of function calls, * because we don't pass the inner IPv6 header. */ bzero(&ip6cp1, sizeof(ip6cp1)); ip6cp1.ip6c_src = ip6cp->ip6c_src; pfctlinput2(cmd, sa, (void *)&ip6cp1); /* * Then go to special cases that need ESP header information. * XXX: We assume that when ip6 is non NULL, * M and OFF are valid. */ /* check if we can safely examine src and dst ports */ if (m->m_pkthdr.len < off + sizeof(esp)) return; if (m->m_len < off + sizeof(esp)) { /* * this should be rare case, * so we compromise on this copy... */ m_copydata(m, off, sizeof(esp), (caddr_t)&esp); espp = &esp; } else espp = (struct newesp*)(mtod(m, caddr_t) + off); if (cmd == PRC_MSGSIZE) { int valid = 0; /* * Check to see if we have a valid SA corresponding to * the address in the ICMP message payload. */ + sa6_src = ip6cp->ip6c_src; + sa6_dst = (struct sockaddr_in6 *)sa; sav = key_allocsa(AF_INET6, - (caddr_t)&sa6_src.sin6_addr, - (caddr_t)&sa6_dst, IPPROTO_ESP, - espp->esp_spi); + (caddr_t)&sa6_src->sin6_addr, + (caddr_t)&sa6_dst->sin6_addr, + IPPROTO_ESP, espp->esp_spi); if (sav) { if (sav->state == SADB_SASTATE_MATURE || sav->state == SADB_SASTATE_DYING) valid++; key_freesav(sav); } /* XXX Further validation? */ /* * Depending on the value of "valid" and routing table * size (mtudisc_{hi,lo}wat), we will: * - recalcurate the new MTU and create the * corresponding routing entry, or * - ignore the MTU change notification. */ icmp6_mtudisc_update((struct ip6ctlparam *)d, valid); } } else { /* we normally notify any pcb here */ } } #endif /* INET6 */