int ipsec_process_done(struct mbuf *m, struct ipsecrequest *isr) { struct tdb_ident *tdbi; struct m_tag *mtag; struct secasvar *sav; struct secasindex *saidx; int error; IPSEC_ASSERT(m != NULL, ("null mbuf")); IPSEC_ASSERT(isr != NULL, ("null ISR")); sav = isr->sav; IPSEC_ASSERT(sav != NULL, ("null SA")); IPSEC_ASSERT(sav->sah != NULL, ("null SAH")); saidx = &sav->sah->saidx; switch (saidx->dst.sa.sa_family) { #ifdef INET case AF_INET: /* Fix the header length, for AH processing. */ mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len); break; #endif /* INET */ #ifdef INET6 case AF_INET6: /* Fix the header length, for AH processing. */ if (m->m_pkthdr.len < sizeof (struct ip6_hdr)) { error = ENXIO; goto bad; } if (m->m_pkthdr.len - sizeof (struct ip6_hdr) > IPV6_MAXPACKET) { /* No jumbogram support. */ error = ENXIO; /*?*/ goto bad; } mtod(m, struct ip6_hdr *)->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); break; #endif /* INET6 */ default: DPRINTF(("%s: unknown protocol family %u\n", __func__, saidx->dst.sa.sa_family)); error = ENXIO; goto bad; } /* * Add a record of what we've done or what needs to be done to the * packet. */ mtag = m_tag_get(PACKET_TAG_IPSEC_OUT_DONE, sizeof(struct tdb_ident), M_NOWAIT); if (mtag == NULL) { DPRINTF(("%s: could not get packet tag\n", __func__)); error = ENOMEM; goto bad; } tdbi = (struct tdb_ident *)(mtag + 1); tdbi->dst = saidx->dst; tdbi->proto = saidx->proto; tdbi->spi = sav->spi; m_tag_prepend(m, mtag); /* * If there's another (bundled) SA to apply, do so. * Note that this puts a burden on the kernel stack size. * If this is a problem we'll need to introduce a queue * to set the packet on so we can unwind the stack before * doing further processing. */ if (isr->next) { /* XXX-BZ currently only support same AF bundles. */ switch (saidx->dst.sa.sa_family) { #ifdef INET case AF_INET: IPSECSTAT_INC(ips_out_bundlesa); return ipsec4_process_packet(m, isr->next); /* NOTREACHED */ #endif #ifdef notyet #ifdef INET6 case AF_INET6: /* XXX */ IPSEC6STAT_INC(ips_out_bundlesa); return ipsec6_process_packet(m, isr->next); /* NOTREACHED */ #endif /* INET6 */ #endif default: DPRINTF(("%s: unknown protocol family %u\n", __func__, saidx->dst.sa.sa_family)); error = ENXIO; goto bad; } } key_sa_recordxfer(sav, m); /* record data transfer */ /* * We're done with IPsec processing, transmit the packet using the * appropriate network protocol (IP or IPv6). SPD lookup will be * performed again there. */ switch (saidx->dst.sa.sa_family) { #ifdef INET case AF_INET: #ifdef IPSEC_NAT_T /* * If NAT-T is enabled, now that all IPsec processing is done * insert UDP encapsulation header after IP header. */ if (sav->natt_type) { struct ip *ip = mtod(m, struct ip *); const int hlen = (ip->ip_hl << 2); int size, off; struct mbuf *mi; struct udphdr *udp; size = sizeof(struct udphdr); if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) { /* * draft-ietf-ipsec-nat-t-ike-0[01].txt and * draft-ietf-ipsec-udp-encaps-(00/)01.txt, * ignoring possible AH mode * non-IKE marker + non-ESP marker * from draft-ietf-ipsec-udp-encaps-00.txt. */ size += sizeof(u_int64_t); } mi = m_makespace(m, hlen, size, &off); if (mi == NULL) { DPRINTF(("%s: m_makespace for udphdr failed\n", __func__)); error = ENOBUFS; goto bad; } udp = (struct udphdr *)(mtod(mi, caddr_t) + off); if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) udp->uh_sport = htons(UDP_ENCAP_ESPINUDP_PORT); else udp->uh_sport = KEY_PORTFROMSADDR(&sav->sah->saidx.src); udp->uh_dport = KEY_PORTFROMSADDR(&sav->sah->saidx.dst); udp->uh_sum = 0; udp->uh_ulen = htons(m->m_pkthdr.len - hlen); ip->ip_len = htons(m->m_pkthdr.len); ip->ip_p = IPPROTO_UDP; if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) *(u_int64_t *)(udp + 1) = 0; } #endif /* IPSEC_NAT_T */ return ip_output(m, NULL, NULL, IP_RAWOUTPUT, NULL, NULL); #endif /* INET */ #ifdef INET6 case AF_INET6: /* * We don't need massage, IPv6 header fields are always in * net endian. */ return ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL); #endif /* INET6 */ } panic("ipsec_process_done"); bad: m_freem(m); return (error); }
int esp4_input(struct mbuf **mp, int *offp, int proto) { int off; struct ip *ip; struct esp *esp; struct esptail esptail; struct mbuf *m; 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; off = *offp; m = *mp; *mp = NULL; /* 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 *); 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, kprintf("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, "improper 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 (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, &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(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; } 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 (netisr_queue(NETISR_IP, m)) { ipsecstat.in_inval++; m = NULL; goto bad; } nxt = IPPROTO_DONE; } else {