/* $NetBSD: esp_input.c,v 1.37 2005/04/29 10:39:09 yamt Exp $ */ /* $KAME: esp_input.c,v 1.60 2001/09/04 08:43:19 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 __KERNEL_RCSID(0, "$NetBSD: esp_input.c,v 1.37 2005/04/29 10:39:09 yamt Exp $"); #include "opt_inet.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef INET6 #include #include #include #include #endif #include #include #include #include #include #include #include #include /*#define IPLEN_FLIPPED*/ #define ESPMAXLEN \ (sizeof(struct esp) < sizeof(struct newesp) \ ? sizeof(struct newesp) : sizeof(struct esp)) #ifdef INET void #if __STDC__ esp4_input(struct mbuf *m, ...) #else esp4_input(m, va_alist) struct mbuf *m; va_dcl #endif { 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 s; va_list ap; int off; u_int16_t sport = 0; u_int16_t dport = 0; #ifdef IPSEC_NAT_T struct m_tag *tag = NULL; #endif va_start(ap, m); off = va_arg(ap, int); (void)va_arg(ap, int); /* ignore value, advance ap */ va_end(ap); /* 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; } } #ifdef IPSEC_NAT_T /* find the source port for NAT_T */ if ((tag = m_tag_find(m, PACKET_TAG_IPSEC_NAT_T_PORTS, NULL)) != NULL) { sport = ((u_int16_t *)(tag + 1))[0]; dport = ((u_int16_t *)(tag + 1))[1]; } #endif ip = mtod(m, struct ip *); esp = (struct esp *)(((u_int8_t *)ip) + off); hlen = ip->ip_hl << 2; /* 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, sport, dport)) == 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_int8_t sum0[AH_MAXSUMSIZE]; u_int8_t 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 (m->m_pkthdr.len < off + ESPMAXLEN + siz) { ipsecstat.in_inval++; goto bad; } 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, (caddr_t)&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 < off + esplen + ivlen + sizeof(esptail)) { 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(ip, 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; } 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; } s = splnet(); if (IF_QFULL(&ipintrq)) { ipsecstat.in_inval++; splx(s); goto bad; } IF_ENQUEUE(&ipintrq, m); m = NULL; schednetisr(NETISR_IP); /* can be skipped but to make sure */ splx(s); 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, nxt); } 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; } /* assumes that ip header and esp header are contiguous on mbuf */ void * esp4_ctlinput(cmd, sa, v) int cmd; struct sockaddr *sa; void *v; { struct ip *ip = v; struct esp *esp; struct icmp *icp; struct secasvar *sav; if (sa->sa_family != AF_INET || sa->sa_len != sizeof(struct sockaddr_in)) return NULL; if ((unsigned)cmd >= PRC_NCMDS) return NULL; if (cmd == PRC_MSGSIZE && ip_mtudisc && ip && ip->ip_v == 4) { /* * Check to see if we have a valid SA corresponding to * the address in the ICMP message payload. */ esp = (struct esp *)((caddr_t)ip + (ip->ip_hl << 2)); if ((sav = key_allocsa(AF_INET, (caddr_t) &ip->ip_src, (caddr_t) &ip->ip_dst, IPPROTO_ESP, esp->esp_spi, 0, 0)) == NULL) return NULL; if (sav->state != SADB_SASTATE_MATURE && sav->state != SADB_SASTATE_DYING) { key_freesav(sav); return NULL; } /* XXX Further validation? */ key_freesav(sav); /* * Now that we've validated that we are actually communicating * with the host indicated in the ICMP message, locate the * ICMP header, recalculate the new MTU, and create the * corresponding routing entry. */ icp = (struct icmp *)((caddr_t)ip - offsetof(struct icmp, icmp_ip)); icmp_mtudisc(icp, ip->ip_dst); return NULL; } return NULL; } #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; int s; /* 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; } IP6_EXTHDR_GET(esp, struct esp *, m, off, ESPMAXLEN); if (esp == NULL) { ipsec6stat.in_inval++; return IPPROTO_DONE; } 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, 0)) == 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 (m->m_pkthdr.len < off + ESPMAXLEN + siz) { ipsec6stat.in_inval++; goto bad; } 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, (caddr_t)&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; } IP6_EXTHDR_GET(esp, struct esp *, m, off, esplen + ivlen); if (esp == NULL) { ipsec6stat.in_inval++; m = NULL; goto bad; } 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(ip6, 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)) { 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; } 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; } s = splnet(); if (IF_QFULL(&ip6intrq)) { ipsec6stat.in_inval++; splx(s); goto bad; } IF_ENQUEUE(&ip6intrq, m); m = NULL; schednetisr(NETISR_IPV6); /* can be skipped but to make sure */ splx(s); 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; u_int8_t *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 does not update m_pkthdr.len */ m->m_pkthdr.len += n->m_pkthdr.len; m_cat(m, n); } 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; 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; } 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->sin6_addr, IPPROTO_ESP, espp->esp_spi, 0, 0); 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 */