ipsec_output.c revision 213837
1112758Ssam/*- 2112758Ssam * Copyright (c) 2002, 2003 Sam Leffler, Errno Consulting 3112758Ssam * All rights reserved. 4112758Ssam * 5112758Ssam * Redistribution and use in source and binary forms, with or without 6112758Ssam * modification, are permitted provided that the following conditions 7112758Ssam * are met: 8112758Ssam * 1. Redistributions of source code must retain the above copyright 9112758Ssam * notice, this list of conditions and the following disclaimer. 10112758Ssam * 2. Redistributions in binary form must reproduce the above copyright 11112758Ssam * notice, this list of conditions and the following disclaimer in the 12112758Ssam * documentation and/or other materials provided with the distribution. 13112758Ssam * 14112758Ssam * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15112758Ssam * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16112758Ssam * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17112758Ssam * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18112758Ssam * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19112758Ssam * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20112758Ssam * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21112758Ssam * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22112758Ssam * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23112758Ssam * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24112758Ssam * SUCH DAMAGE. 25112758Ssam * 26112758Ssam * $FreeBSD: head/sys/netipsec/ipsec_output.c 213837 2010-10-14 15:15:22Z bz $ 27112758Ssam */ 28105197Ssam 29105197Ssam/* 30105197Ssam * IPsec output processing. 31105197Ssam */ 32105197Ssam#include "opt_inet.h" 33105197Ssam#include "opt_inet6.h" 34105197Ssam#include "opt_ipsec.h" 35159965Sthompsa#include "opt_enc.h" 36105197Ssam 37105197Ssam#include <sys/param.h> 38105197Ssam#include <sys/systm.h> 39105197Ssam#include <sys/mbuf.h> 40105197Ssam#include <sys/domain.h> 41105197Ssam#include <sys/protosw.h> 42105197Ssam#include <sys/socket.h> 43105197Ssam#include <sys/errno.h> 44105197Ssam#include <sys/syslog.h> 45105197Ssam 46105197Ssam#include <net/if.h> 47171497Sbz#include <net/pfil.h> 48105197Ssam#include <net/route.h> 49195699Srwatson#include <net/vnet.h> 50105197Ssam 51105197Ssam#include <netinet/in.h> 52105197Ssam#include <netinet/in_systm.h> 53105197Ssam#include <netinet/ip.h> 54105197Ssam#include <netinet/ip_var.h> 55105197Ssam#include <netinet/in_var.h> 56105197Ssam#include <netinet/ip_ecn.h> 57105197Ssam#ifdef INET6 58105197Ssam#include <netinet6/ip6_ecn.h> 59105197Ssam#endif 60105197Ssam 61105197Ssam#include <netinet/ip6.h> 62105197Ssam#ifdef INET6 63105197Ssam#include <netinet6/ip6_var.h> 64105197Ssam#endif 65105197Ssam#include <netinet/in_pcb.h> 66105197Ssam#ifdef INET6 67105197Ssam#include <netinet/icmp6.h> 68105197Ssam#endif 69105197Ssam 70105197Ssam#include <netipsec/ipsec.h> 71105197Ssam#ifdef INET6 72105197Ssam#include <netipsec/ipsec6.h> 73105197Ssam#endif 74105197Ssam#include <netipsec/ah_var.h> 75105197Ssam#include <netipsec/esp_var.h> 76105197Ssam#include <netipsec/ipcomp_var.h> 77105197Ssam 78105197Ssam#include <netipsec/xform.h> 79105197Ssam 80105197Ssam#include <netipsec/key.h> 81105197Ssam#include <netipsec/keydb.h> 82105197Ssam#include <netipsec/key_debug.h> 83105197Ssam 84105197Ssam#include <machine/in_cksum.h> 85105197Ssam 86194062Svanhu#ifdef IPSEC_NAT_T 87194062Svanhu#include <netinet/udp.h> 88194062Svanhu#endif 89194062Svanhu 90181627Svanhu#ifdef DEV_ENC 91181627Svanhu#include <net/if_enc.h> 92181627Svanhu#endif 93181627Svanhu 94181627Svanhu 95105197Ssamint 96105197Ssamipsec_process_done(struct mbuf *m, struct ipsecrequest *isr) 97105197Ssam{ 98105197Ssam struct tdb_ident *tdbi; 99105197Ssam struct m_tag *mtag; 100105197Ssam struct secasvar *sav; 101105197Ssam struct secasindex *saidx; 102105197Ssam int error; 103105197Ssam 104120585Ssam IPSEC_ASSERT(m != NULL, ("null mbuf")); 105120585Ssam IPSEC_ASSERT(isr != NULL, ("null ISR")); 106105197Ssam sav = isr->sav; 107120585Ssam IPSEC_ASSERT(sav != NULL, ("null SA")); 108120585Ssam IPSEC_ASSERT(sav->sah != NULL, ("null SAH")); 109105197Ssam 110105197Ssam saidx = &sav->sah->saidx; 111105197Ssam switch (saidx->dst.sa.sa_family) { 112105197Ssam#ifdef INET 113105197Ssam case AF_INET: 114105197Ssam /* Fix the header length, for AH processing. */ 115105197Ssam mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len); 116105197Ssam break; 117105197Ssam#endif /* INET */ 118105197Ssam#ifdef INET6 119105197Ssam case AF_INET6: 120105197Ssam /* Fix the header length, for AH processing. */ 121105197Ssam if (m->m_pkthdr.len < sizeof (struct ip6_hdr)) { 122105197Ssam error = ENXIO; 123105197Ssam goto bad; 124105197Ssam } 125105197Ssam if (m->m_pkthdr.len - sizeof (struct ip6_hdr) > IPV6_MAXPACKET) { 126105197Ssam /* No jumbogram support. */ 127105197Ssam error = ENXIO; /*?*/ 128105197Ssam goto bad; 129105197Ssam } 130105197Ssam mtod(m, struct ip6_hdr *)->ip6_plen = 131105197Ssam htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 132105197Ssam break; 133105197Ssam#endif /* INET6 */ 134105197Ssam default: 135120585Ssam DPRINTF(("%s: unknown protocol family %u\n", __func__, 136105197Ssam saidx->dst.sa.sa_family)); 137105197Ssam error = ENXIO; 138105197Ssam goto bad; 139105197Ssam } 140105197Ssam 141105197Ssam /* 142105197Ssam * Add a record of what we've done or what needs to be done to the 143105197Ssam * packet. 144105197Ssam */ 145105197Ssam mtag = m_tag_get(PACKET_TAG_IPSEC_OUT_DONE, 146105197Ssam sizeof(struct tdb_ident), M_NOWAIT); 147105197Ssam if (mtag == NULL) { 148120585Ssam DPRINTF(("%s: could not get packet tag\n", __func__)); 149105197Ssam error = ENOMEM; 150105197Ssam goto bad; 151105197Ssam } 152105197Ssam 153105197Ssam tdbi = (struct tdb_ident *)(mtag + 1); 154105197Ssam tdbi->dst = saidx->dst; 155105197Ssam tdbi->proto = saidx->proto; 156105197Ssam tdbi->spi = sav->spi; 157105197Ssam m_tag_prepend(m, mtag); 158105197Ssam 159105197Ssam /* 160105197Ssam * If there's another (bundled) SA to apply, do so. 161105197Ssam * Note that this puts a burden on the kernel stack size. 162105197Ssam * If this is a problem we'll need to introduce a queue 163105197Ssam * to set the packet on so we can unwind the stack before 164105197Ssam * doing further processing. 165105197Ssam */ 166105197Ssam if (isr->next) { 167181803Sbz V_ipsec4stat.ips_out_bundlesa++; 168105197Ssam return ipsec4_process_packet(m, isr->next, 0, 0); 169105197Ssam } 170117056Ssam key_sa_recordxfer(sav, m); /* record data transfer */ 171105197Ssam 172105197Ssam /* 173105197Ssam * We're done with IPsec processing, transmit the packet using the 174105197Ssam * appropriate network protocol (IP or IPv6). SPD lookup will be 175105197Ssam * performed again there. 176105197Ssam */ 177105197Ssam switch (saidx->dst.sa.sa_family) { 178105197Ssam#ifdef INET 179105197Ssam struct ip *ip; 180105197Ssam case AF_INET: 181105197Ssam ip = mtod(m, struct ip *); 182105197Ssam ip->ip_len = ntohs(ip->ip_len); 183105197Ssam ip->ip_off = ntohs(ip->ip_off); 184105197Ssam 185194062Svanhu#ifdef IPSEC_NAT_T 186194062Svanhu /* 187194062Svanhu * If NAT-T is enabled, now that all IPsec processing is done 188194062Svanhu * insert UDP encapsulation header after IP header. 189194062Svanhu */ 190194062Svanhu if (sav->natt_type) { 191194062Svanhu#ifdef _IP_VHL 192194062Svanhu const int hlen = IP_VHL_HL(ip->ip_vhl); 193194062Svanhu#else 194194062Svanhu const int hlen = (ip->ip_hl << 2); 195194062Svanhu#endif 196194062Svanhu int size, off; 197194062Svanhu struct mbuf *mi; 198194062Svanhu struct udphdr *udp; 199194062Svanhu 200194062Svanhu size = sizeof(struct udphdr); 201194062Svanhu if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) { 202194062Svanhu /* 203194062Svanhu * draft-ietf-ipsec-nat-t-ike-0[01].txt and 204194062Svanhu * draft-ietf-ipsec-udp-encaps-(00/)01.txt, 205194062Svanhu * ignoring possible AH mode 206194062Svanhu * non-IKE marker + non-ESP marker 207194062Svanhu * from draft-ietf-ipsec-udp-encaps-00.txt. 208194062Svanhu */ 209194062Svanhu size += sizeof(u_int64_t); 210194062Svanhu } 211194062Svanhu mi = m_makespace(m, hlen, size, &off); 212194062Svanhu if (mi == NULL) { 213194062Svanhu DPRINTF(("%s: m_makespace for udphdr failed\n", 214194062Svanhu __func__)); 215194062Svanhu error = ENOBUFS; 216194062Svanhu goto bad; 217194062Svanhu } 218194062Svanhu 219194062Svanhu udp = (struct udphdr *)(mtod(mi, caddr_t) + off); 220194062Svanhu if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) 221194062Svanhu udp->uh_sport = htons(UDP_ENCAP_ESPINUDP_PORT); 222194062Svanhu else 223194062Svanhu udp->uh_sport = 224194062Svanhu KEY_PORTFROMSADDR(&sav->sah->saidx.src); 225194062Svanhu udp->uh_dport = KEY_PORTFROMSADDR(&sav->sah->saidx.dst); 226194062Svanhu udp->uh_sum = 0; 227194062Svanhu udp->uh_ulen = htons(m->m_pkthdr.len - hlen); 228194062Svanhu ip->ip_len = m->m_pkthdr.len; 229194062Svanhu ip->ip_p = IPPROTO_UDP; 230194062Svanhu 231194062Svanhu if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) 232194062Svanhu *(u_int64_t *)(udp + 1) = 0; 233194062Svanhu } 234194062Svanhu#endif /* IPSEC_NAT_T */ 235194062Svanhu 236105197Ssam return ip_output(m, NULL, NULL, IP_RAWOUTPUT, NULL, NULL); 237105197Ssam#endif /* INET */ 238105197Ssam#ifdef INET6 239105197Ssam case AF_INET6: 240105197Ssam /* 241105197Ssam * We don't need massage, IPv6 header fields are always in 242105197Ssam * net endian. 243105197Ssam */ 244105197Ssam return ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL); 245105197Ssam#endif /* INET6 */ 246105197Ssam } 247105197Ssam panic("ipsec_process_done"); 248105197Ssambad: 249105197Ssam m_freem(m); 250105197Ssam KEY_FREESAV(&sav); 251105197Ssam return (error); 252105197Ssam} 253105197Ssam 254105197Ssamstatic struct ipsecrequest * 255105197Ssamipsec_nextisr( 256105197Ssam struct mbuf *m, 257105197Ssam struct ipsecrequest *isr, 258105197Ssam int af, 259105197Ssam struct secasindex *saidx, 260105197Ssam int *error 261105197Ssam) 262105197Ssam{ 263105197Ssam#define IPSEC_OSTAT(x,y,z) (isr->saidx.proto == IPPROTO_ESP ? (x)++ : \ 264105197Ssam isr->saidx.proto == IPPROTO_AH ? (y)++ : (z)++) 265105197Ssam struct secasvar *sav; 266105197Ssam 267120585Ssam IPSECREQUEST_LOCK_ASSERT(isr); 268120585Ssam 269120585Ssam IPSEC_ASSERT(af == AF_INET || af == AF_INET6, 270120585Ssam ("invalid address family %u", af)); 271105197Ssamagain: 272105197Ssam /* 273105197Ssam * Craft SA index to search for proper SA. Note that 274105197Ssam * we only fillin unspecified SA peers for transport 275105197Ssam * mode; for tunnel mode they must already be filled in. 276105197Ssam */ 277105197Ssam *saidx = isr->saidx; 278105197Ssam if (isr->saidx.mode == IPSEC_MODE_TRANSPORT) { 279105197Ssam /* Fillin unspecified SA peers only for transport mode */ 280105197Ssam if (af == AF_INET) { 281105197Ssam struct sockaddr_in *sin; 282105197Ssam struct ip *ip = mtod(m, struct ip *); 283105197Ssam 284105197Ssam if (saidx->src.sa.sa_len == 0) { 285105197Ssam sin = &saidx->src.sin; 286105197Ssam sin->sin_len = sizeof(*sin); 287105197Ssam sin->sin_family = AF_INET; 288105197Ssam sin->sin_port = IPSEC_PORT_ANY; 289105197Ssam sin->sin_addr = ip->ip_src; 290105197Ssam } 291105197Ssam if (saidx->dst.sa.sa_len == 0) { 292105197Ssam sin = &saidx->dst.sin; 293105197Ssam sin->sin_len = sizeof(*sin); 294105197Ssam sin->sin_family = AF_INET; 295105197Ssam sin->sin_port = IPSEC_PORT_ANY; 296105197Ssam sin->sin_addr = ip->ip_dst; 297105197Ssam } 298105197Ssam } else { 299105197Ssam struct sockaddr_in6 *sin6; 300105197Ssam struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 301105197Ssam 302105197Ssam if (saidx->src.sin6.sin6_len == 0) { 303105197Ssam sin6 = (struct sockaddr_in6 *)&saidx->src; 304105197Ssam sin6->sin6_len = sizeof(*sin6); 305105197Ssam sin6->sin6_family = AF_INET6; 306105197Ssam sin6->sin6_port = IPSEC_PORT_ANY; 307105197Ssam sin6->sin6_addr = ip6->ip6_src; 308105197Ssam if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 309105197Ssam /* fix scope id for comparing SPD */ 310105197Ssam sin6->sin6_addr.s6_addr16[1] = 0; 311105197Ssam sin6->sin6_scope_id = 312105197Ssam ntohs(ip6->ip6_src.s6_addr16[1]); 313105197Ssam } 314105197Ssam } 315105197Ssam if (saidx->dst.sin6.sin6_len == 0) { 316105197Ssam sin6 = (struct sockaddr_in6 *)&saidx->dst; 317105197Ssam sin6->sin6_len = sizeof(*sin6); 318105197Ssam sin6->sin6_family = AF_INET6; 319105197Ssam sin6->sin6_port = IPSEC_PORT_ANY; 320105197Ssam sin6->sin6_addr = ip6->ip6_dst; 321105197Ssam if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 322105197Ssam /* fix scope id for comparing SPD */ 323105197Ssam sin6->sin6_addr.s6_addr16[1] = 0; 324105197Ssam sin6->sin6_scope_id = 325105197Ssam ntohs(ip6->ip6_dst.s6_addr16[1]); 326105197Ssam } 327105197Ssam } 328105197Ssam } 329105197Ssam } 330105197Ssam 331105197Ssam /* 332105197Ssam * Lookup SA and validate it. 333105197Ssam */ 334105197Ssam *error = key_checkrequest(isr, saidx); 335105197Ssam if (*error != 0) { 336105197Ssam /* 337105197Ssam * IPsec processing is required, but no SA found. 338105197Ssam * I assume that key_acquire() had been called 339105197Ssam * to get/establish the SA. Here I discard 340105197Ssam * this packet because it is responsibility for 341105197Ssam * upper layer to retransmit the packet. 342105197Ssam */ 343181803Sbz V_ipsec4stat.ips_out_nosa++; 344105197Ssam goto bad; 345105197Ssam } 346105197Ssam sav = isr->sav; 347177175Sbz if (sav == NULL) { 348120585Ssam IPSEC_ASSERT(ipsec_get_reqlevel(isr) == IPSEC_LEVEL_USE, 349120585Ssam ("no SA found, but required; level %u", 350105197Ssam ipsec_get_reqlevel(isr))); 351120585Ssam IPSECREQUEST_UNLOCK(isr); 352105197Ssam isr = isr->next; 353177175Sbz /* 354177175Sbz * If isr is NULL, we found a 'use' policy w/o SA. 355177175Sbz * Return w/o error and w/o isr so we can drop out 356177175Sbz * and continue w/o IPsec processing. 357177175Sbz */ 358177175Sbz if (isr == NULL) 359105197Ssam return isr; 360120585Ssam IPSECREQUEST_LOCK(isr); 361105197Ssam goto again; 362105197Ssam } 363105197Ssam 364105197Ssam /* 365105197Ssam * Check system global policy controls. 366105197Ssam */ 367181803Sbz if ((isr->saidx.proto == IPPROTO_ESP && !V_esp_enable) || 368181803Sbz (isr->saidx.proto == IPPROTO_AH && !V_ah_enable) || 369181803Sbz (isr->saidx.proto == IPPROTO_IPCOMP && !V_ipcomp_enable)) { 370120585Ssam DPRINTF(("%s: IPsec outbound packet dropped due" 371120585Ssam " to policy (check your sysctls)\n", __func__)); 372181803Sbz IPSEC_OSTAT(V_espstat.esps_pdrops, V_ahstat.ahs_pdrops, 373181803Sbz V_ipcompstat.ipcomps_pdrops); 374105197Ssam *error = EHOSTUNREACH; 375105197Ssam goto bad; 376105197Ssam } 377105197Ssam 378105197Ssam /* 379105197Ssam * Sanity check the SA contents for the caller 380105197Ssam * before they invoke the xform output method. 381105197Ssam */ 382105197Ssam if (sav->tdb_xform == NULL) { 383120585Ssam DPRINTF(("%s: no transform for SA\n", __func__)); 384181803Sbz IPSEC_OSTAT(V_espstat.esps_noxform, V_ahstat.ahs_noxform, 385181803Sbz V_ipcompstat.ipcomps_noxform); 386105197Ssam *error = EHOSTUNREACH; 387105197Ssam goto bad; 388105197Ssam } 389105197Ssam return isr; 390105197Ssambad: 391120585Ssam IPSEC_ASSERT(*error != 0, ("error return w/ no error code")); 392120585Ssam IPSECREQUEST_UNLOCK(isr); 393105197Ssam return NULL; 394105197Ssam#undef IPSEC_OSTAT 395105197Ssam} 396105197Ssam 397105197Ssam#ifdef INET 398105197Ssam/* 399105197Ssam * IPsec output logic for IPv4. 400105197Ssam */ 401105197Ssamint 402105197Ssamipsec4_process_packet( 403105197Ssam struct mbuf *m, 404105197Ssam struct ipsecrequest *isr, 405105197Ssam int flags, 406105197Ssam int tunalready) 407105197Ssam{ 408105197Ssam struct secasindex saidx; 409105197Ssam struct secasvar *sav; 410105197Ssam struct ip *ip; 411119643Ssam int error, i, off; 412105197Ssam 413120585Ssam IPSEC_ASSERT(m != NULL, ("null mbuf")); 414120585Ssam IPSEC_ASSERT(isr != NULL, ("null isr")); 415105197Ssam 416120585Ssam IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */ 417105197Ssam 418105197Ssam isr = ipsec_nextisr(m, isr, AF_INET, &saidx, &error); 419177175Sbz if (isr == NULL) { 420177175Sbz if (error != 0) 421177175Sbz goto bad; 422177175Sbz return EJUSTRETURN; 423177175Sbz } 424105197Ssam 425105197Ssam sav = isr->sav; 426159965Sthompsa 427159965Sthompsa#ifdef DEV_ENC 428181627Svanhu encif->if_opackets++; 429181627Svanhu encif->if_obytes += m->m_pkthdr.len; 430181627Svanhu 431174054Sbz /* pass the mbuf to enc0 for bpf processing */ 432174054Sbz ipsec_bpf(m, sav, AF_INET, ENC_OUT|ENC_BEFORE); 433159965Sthompsa /* pass the mbuf to enc0 for packet filtering */ 434174054Sbz if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_BEFORE)) != 0) 435159965Sthompsa goto bad; 436159965Sthompsa#endif 437159965Sthompsa 438105197Ssam if (!tunalready) { 439105197Ssam union sockaddr_union *dst = &sav->sah->saidx.dst; 440105197Ssam int setdf; 441105197Ssam 442105197Ssam /* 443105197Ssam * Collect IP_DF state from the outer header. 444105197Ssam */ 445105197Ssam if (dst->sa.sa_family == AF_INET) { 446105197Ssam if (m->m_len < sizeof (struct ip) && 447105197Ssam (m = m_pullup(m, sizeof (struct ip))) == NULL) { 448105197Ssam error = ENOBUFS; 449105197Ssam goto bad; 450105197Ssam } 451105197Ssam ip = mtod(m, struct ip *); 452105197Ssam /* Honor system-wide control of how to handle IP_DF */ 453181803Sbz switch (V_ip4_ipsec_dfbit) { 454105197Ssam case 0: /* clear in outer header */ 455105197Ssam case 1: /* set in outer header */ 456181803Sbz setdf = V_ip4_ipsec_dfbit; 457105197Ssam break; 458105197Ssam default: /* propagate to outer header */ 459105197Ssam setdf = ntohs(ip->ip_off & IP_DF); 460105197Ssam break; 461105197Ssam } 462105197Ssam } else { 463105197Ssam ip = NULL; /* keep compiler happy */ 464105197Ssam setdf = 0; 465105197Ssam } 466105197Ssam /* Do the appropriate encapsulation, if necessary */ 467105197Ssam if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */ 468105197Ssam dst->sa.sa_family != AF_INET || /* PF mismatch */ 469105197Ssam#if 0 470105197Ssam (sav->flags & SADB_X_SAFLAGS_TUNNEL) || /* Tunnel requ'd */ 471105197Ssam sav->tdb_xform->xf_type == XF_IP4 || /* ditto */ 472105197Ssam#endif 473105197Ssam (dst->sa.sa_family == AF_INET && /* Proxy */ 474105197Ssam dst->sin.sin_addr.s_addr != INADDR_ANY && 475105197Ssam dst->sin.sin_addr.s_addr != ip->ip_dst.s_addr)) { 476105197Ssam struct mbuf *mp; 477105197Ssam 478105197Ssam /* Fix IPv4 header checksum and length */ 479105197Ssam if (m->m_len < sizeof (struct ip) && 480105197Ssam (m = m_pullup(m, sizeof (struct ip))) == NULL) { 481105197Ssam error = ENOBUFS; 482105197Ssam goto bad; 483105197Ssam } 484105197Ssam ip = mtod(m, struct ip *); 485105197Ssam ip->ip_len = htons(m->m_pkthdr.len); 486105197Ssam ip->ip_sum = 0; 487105197Ssam#ifdef _IP_VHL 488105197Ssam if (ip->ip_vhl == IP_VHL_BORING) 489105197Ssam ip->ip_sum = in_cksum_hdr(ip); 490105197Ssam else 491105197Ssam ip->ip_sum = in_cksum(m, 492105197Ssam _IP_VHL_HL(ip->ip_vhl) << 2); 493105197Ssam#else 494105197Ssam ip->ip_sum = in_cksum(m, ip->ip_hl << 2); 495105197Ssam#endif 496105197Ssam 497105197Ssam /* Encapsulate the packet */ 498105197Ssam error = ipip_output(m, isr, &mp, 0, 0); 499105197Ssam if (mp == NULL && !error) { 500105197Ssam /* Should never happen. */ 501120585Ssam DPRINTF(("%s: ipip_output returns no mbuf and " 502120585Ssam "no error!", __func__)); 503105197Ssam error = EFAULT; 504105197Ssam } 505105197Ssam if (error) { 506124765Ssam if (mp) { 507124765Ssam /* XXX: Should never happen! */ 508105197Ssam m_freem(mp); 509124765Ssam } 510124765Ssam m = NULL; /* ipip_output() already freed it */ 511105197Ssam goto bad; 512105197Ssam } 513105197Ssam m = mp, mp = NULL; 514105197Ssam /* 515105197Ssam * ipip_output clears IP_DF in the new header. If 516105197Ssam * we need to propagate IP_DF from the outer header, 517105197Ssam * then we have to do it here. 518105197Ssam * 519105197Ssam * XXX shouldn't assume what ipip_output does. 520105197Ssam */ 521105197Ssam if (dst->sa.sa_family == AF_INET && setdf) { 522105197Ssam if (m->m_len < sizeof (struct ip) && 523105197Ssam (m = m_pullup(m, sizeof (struct ip))) == NULL) { 524105197Ssam error = ENOBUFS; 525105197Ssam goto bad; 526105197Ssam } 527105197Ssam ip = mtod(m, struct ip *); 528105197Ssam ip->ip_off = ntohs(ip->ip_off); 529105197Ssam ip->ip_off |= IP_DF; 530105197Ssam ip->ip_off = htons(ip->ip_off); 531105197Ssam } 532105197Ssam } 533105197Ssam } 534105197Ssam 535159965Sthompsa#ifdef DEV_ENC 536159965Sthompsa /* pass the mbuf to enc0 for bpf processing */ 537174054Sbz ipsec_bpf(m, sav, AF_INET, ENC_OUT|ENC_AFTER); 538174054Sbz /* pass the mbuf to enc0 for packet filtering */ 539174054Sbz if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_AFTER)) != 0) 540174054Sbz goto bad; 541159965Sthompsa#endif 542159965Sthompsa 543105197Ssam /* 544105197Ssam * Dispatch to the appropriate IPsec transform logic. The 545105197Ssam * packet will be returned for transmission after crypto 546105197Ssam * processing, etc. are completed. For encapsulation we 547105197Ssam * bypass this call because of the explicit call done above 548105197Ssam * (necessary to deal with IP_DF handling for IPv4). 549105197Ssam * 550105197Ssam * NB: m & sav are ``passed to caller'' who's reponsible for 551105197Ssam * for reclaiming their resources. 552105197Ssam */ 553105197Ssam if (sav->tdb_xform->xf_type != XF_IP4) { 554105197Ssam ip = mtod(m, struct ip *); 555105197Ssam i = ip->ip_hl << 2; 556105197Ssam off = offsetof(struct ip, ip_p); 557105197Ssam error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off); 558105197Ssam } else { 559105197Ssam error = ipsec_process_done(m, isr); 560105197Ssam } 561120585Ssam IPSECREQUEST_UNLOCK(isr); 562105197Ssam return error; 563105197Ssambad: 564120585Ssam if (isr) 565120585Ssam IPSECREQUEST_UNLOCK(isr); 566105197Ssam if (m) 567105197Ssam m_freem(m); 568105197Ssam return error; 569105197Ssam} 570105197Ssam#endif 571105197Ssam 572105197Ssam#ifdef INET6 573105197Ssam/* 574105197Ssam * Chop IP6 header from the payload. 575105197Ssam */ 576105197Ssamstatic struct mbuf * 577105197Ssamipsec6_splithdr(struct mbuf *m) 578105197Ssam{ 579105197Ssam struct mbuf *mh; 580105197Ssam struct ip6_hdr *ip6; 581105197Ssam int hlen; 582105197Ssam 583120585Ssam IPSEC_ASSERT(m->m_len >= sizeof (struct ip6_hdr), 584120585Ssam ("first mbuf too short, len %u", m->m_len)); 585105197Ssam ip6 = mtod(m, struct ip6_hdr *); 586105197Ssam hlen = sizeof(struct ip6_hdr); 587105197Ssam if (m->m_len > hlen) { 588151967Sandre MGETHDR(mh, M_DONTWAIT, MT_DATA); 589105197Ssam if (!mh) { 590105197Ssam m_freem(m); 591105197Ssam return NULL; 592105197Ssam } 593108466Ssam M_MOVE_PKTHDR(mh, m); 594105197Ssam MH_ALIGN(mh, hlen); 595105197Ssam m->m_len -= hlen; 596105197Ssam m->m_data += hlen; 597105197Ssam mh->m_next = m; 598105197Ssam m = mh; 599105197Ssam m->m_len = hlen; 600105197Ssam bcopy((caddr_t)ip6, mtod(m, caddr_t), hlen); 601105197Ssam } else if (m->m_len < hlen) { 602105197Ssam m = m_pullup(m, hlen); 603105197Ssam if (!m) 604105197Ssam return NULL; 605105197Ssam } 606105197Ssam return m; 607105197Ssam} 608105197Ssam 609105197Ssam/* 610105197Ssam * IPsec output logic for IPv6, transport mode. 611105197Ssam */ 612105197Ssamint 613105197Ssamipsec6_output_trans( 614105197Ssam struct ipsec_output_state *state, 615105197Ssam u_char *nexthdrp, 616105197Ssam struct mbuf *mprev, 617105197Ssam struct secpolicy *sp, 618105197Ssam int flags, 619105197Ssam int *tun) 620105197Ssam{ 621105197Ssam struct ipsecrequest *isr; 622105197Ssam struct secasindex saidx; 623105197Ssam int error = 0; 624105197Ssam struct mbuf *m; 625105197Ssam 626120585Ssam IPSEC_ASSERT(state != NULL, ("null state")); 627120585Ssam IPSEC_ASSERT(state->m != NULL, ("null m")); 628120585Ssam IPSEC_ASSERT(nexthdrp != NULL, ("null nexthdrp")); 629120585Ssam IPSEC_ASSERT(mprev != NULL, ("null mprev")); 630120585Ssam IPSEC_ASSERT(sp != NULL, ("null sp")); 631120585Ssam IPSEC_ASSERT(tun != NULL, ("null tun")); 632105197Ssam 633105197Ssam KEYDEBUG(KEYDEBUG_IPSEC_DATA, 634170122Sbz printf("%s: applied SP\n", __func__); 635105197Ssam kdebug_secpolicy(sp)); 636105197Ssam 637105197Ssam isr = sp->req; 638105197Ssam if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 639105197Ssam /* the rest will be handled by ipsec6_output_tunnel() */ 640105197Ssam *tun = 1; /* need tunnel-mode processing */ 641105197Ssam return 0; 642105197Ssam } 643105197Ssam 644105197Ssam *tun = 0; 645105197Ssam m = state->m; 646105197Ssam 647171133Sgnn IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */ 648105197Ssam isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error); 649105197Ssam if (isr == NULL) { 650177175Sbz if (error != 0) { 651105197Ssam#ifdef notdef 652177175Sbz /* XXX should notification be done for all errors ? */ 653177175Sbz /* 654177175Sbz * Notify the fact that the packet is discarded 655177175Sbz * to ourselves. I believe this is better than 656177175Sbz * just silently discarding. (jinmei@kame.net) 657177175Sbz * XXX: should we restrict the error to TCP packets? 658177175Sbz * XXX: should we directly notify sockets via 659177175Sbz * pfctlinputs? 660177175Sbz */ 661177175Sbz icmp6_error(m, ICMP6_DST_UNREACH, 662177175Sbz ICMP6_DST_UNREACH_ADMIN, 0); 663177175Sbz m = NULL; /* NB: icmp6_error frees mbuf */ 664105197Ssam#endif 665177175Sbz goto bad; 666177175Sbz } 667177175Sbz return EJUSTRETURN; 668105197Ssam } 669105197Ssam 670171133Sgnn error = (*isr->sav->tdb_xform->xf_output)(m, isr, NULL, 671171133Sgnn sizeof (struct ip6_hdr), 672171133Sgnn offsetof(struct ip6_hdr, 673171133Sgnn ip6_nxt)); 674171133Sgnn IPSECREQUEST_UNLOCK(isr); 675171133Sgnn return error; 676105197Ssambad: 677171133Sgnn if (isr) 678171133Sgnn IPSECREQUEST_UNLOCK(isr); 679105197Ssam if (m) 680105197Ssam m_freem(m); 681105197Ssam state->m = NULL; 682105197Ssam return error; 683105197Ssam} 684105197Ssam 685105197Ssamstatic int 686105197Ssamipsec6_encapsulate(struct mbuf *m, struct secasvar *sav) 687105197Ssam{ 688105197Ssam struct ip6_hdr *oip6; 689105197Ssam struct ip6_hdr *ip6; 690105197Ssam size_t plen; 691105197Ssam 692105197Ssam /* can't tunnel between different AFs */ 693105197Ssam if (sav->sah->saidx.src.sa.sa_family != AF_INET6 || 694105197Ssam sav->sah->saidx.dst.sa.sa_family != AF_INET6) { 695105197Ssam m_freem(m); 696105197Ssam return EINVAL; 697105197Ssam } 698171133Sgnn IPSEC_ASSERT(m->m_len == sizeof (struct ip6_hdr), 699120585Ssam ("mbuf wrong size; len %u", m->m_len)); 700105197Ssam 701105197Ssam 702105197Ssam /* 703105197Ssam * grow the mbuf to accomodate the new IPv6 header. 704105197Ssam */ 705105197Ssam plen = m->m_pkthdr.len; 706105197Ssam if (M_LEADINGSPACE(m->m_next) < sizeof(struct ip6_hdr)) { 707105197Ssam struct mbuf *n; 708111119Simp MGET(n, M_DONTWAIT, MT_DATA); 709105197Ssam if (!n) { 710105197Ssam m_freem(m); 711105197Ssam return ENOBUFS; 712105197Ssam } 713105197Ssam n->m_len = sizeof(struct ip6_hdr); 714105197Ssam n->m_next = m->m_next; 715105197Ssam m->m_next = n; 716105197Ssam m->m_pkthdr.len += sizeof(struct ip6_hdr); 717105197Ssam oip6 = mtod(n, struct ip6_hdr *); 718105197Ssam } else { 719105197Ssam m->m_next->m_len += sizeof(struct ip6_hdr); 720105197Ssam m->m_next->m_data -= sizeof(struct ip6_hdr); 721105197Ssam m->m_pkthdr.len += sizeof(struct ip6_hdr); 722105197Ssam oip6 = mtod(m->m_next, struct ip6_hdr *); 723105197Ssam } 724105197Ssam ip6 = mtod(m, struct ip6_hdr *); 725113076Sdes bcopy((caddr_t)ip6, (caddr_t)oip6, sizeof(struct ip6_hdr)); 726105197Ssam 727105197Ssam /* Fake link-local scope-class addresses */ 728105197Ssam if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src)) 729105197Ssam oip6->ip6_src.s6_addr16[1] = 0; 730105197Ssam if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst)) 731105197Ssam oip6->ip6_dst.s6_addr16[1] = 0; 732105197Ssam 733105197Ssam /* construct new IPv6 header. see RFC 2401 5.1.2.2 */ 734105197Ssam /* ECN consideration. */ 735181803Sbz ip6_ecn_ingress(V_ip6_ipsec_ecn, &ip6->ip6_flow, &oip6->ip6_flow); 736105197Ssam if (plen < IPV6_MAXPACKET - sizeof(struct ip6_hdr)) 737105197Ssam ip6->ip6_plen = htons(plen); 738105197Ssam else { 739105197Ssam /* ip6->ip6_plen will be updated in ip6_output() */ 740105197Ssam } 741105197Ssam ip6->ip6_nxt = IPPROTO_IPV6; 742171133Sgnn ip6->ip6_src = sav->sah->saidx.src.sin6.sin6_addr; 743171133Sgnn ip6->ip6_dst = sav->sah->saidx.dst.sin6.sin6_addr; 744105197Ssam ip6->ip6_hlim = IPV6_DEFHLIM; 745105197Ssam 746105197Ssam /* XXX Should ip6_src be updated later ? */ 747105197Ssam 748105197Ssam return 0; 749105197Ssam} 750105197Ssam 751105197Ssam/* 752105197Ssam * IPsec output logic for IPv6, tunnel mode. 753105197Ssam */ 754105197Ssamint 755105197Ssamipsec6_output_tunnel(struct ipsec_output_state *state, struct secpolicy *sp, int flags) 756105197Ssam{ 757105197Ssam struct ip6_hdr *ip6; 758105197Ssam struct ipsecrequest *isr; 759105197Ssam struct secasindex saidx; 760105197Ssam int error; 761213836Sbz struct sockaddr_in6 *dst6; 762105197Ssam struct mbuf *m; 763105197Ssam 764120585Ssam IPSEC_ASSERT(state != NULL, ("null state")); 765120585Ssam IPSEC_ASSERT(state->m != NULL, ("null m")); 766120585Ssam IPSEC_ASSERT(sp != NULL, ("null sp")); 767105197Ssam 768105197Ssam KEYDEBUG(KEYDEBUG_IPSEC_DATA, 769170122Sbz printf("%s: applied SP\n", __func__); 770105197Ssam kdebug_secpolicy(sp)); 771105197Ssam 772105197Ssam m = state->m; 773105197Ssam /* 774105197Ssam * transport mode ipsec (before the 1st tunnel mode) is already 775105197Ssam * processed by ipsec6_output_trans(). 776105197Ssam */ 777105197Ssam for (isr = sp->req; isr; isr = isr->next) { 778105197Ssam if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 779105197Ssam break; 780105197Ssam } 781170123Sbz 782170123Sbz IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */ 783105197Ssam isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error); 784177175Sbz if (isr == NULL) { 785177175Sbz if (error != 0) 786177175Sbz goto bad; 787177175Sbz return EJUSTRETURN; 788177175Sbz } 789105197Ssam 790174054Sbz#ifdef DEV_ENC 791181627Svanhu encif->if_opackets++; 792181627Svanhu encif->if_obytes += m->m_pkthdr.len; 793181627Svanhu 794174054Sbz /* pass the mbuf to enc0 for bpf processing */ 795174054Sbz ipsec_bpf(m, isr->sav, AF_INET6, ENC_OUT|ENC_BEFORE); 796174054Sbz /* pass the mbuf to enc0 for packet filtering */ 797174054Sbz if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_BEFORE)) != 0) 798174054Sbz goto bad; 799174054Sbz#endif 800174054Sbz 801105197Ssam /* 802105197Ssam * There may be the case that SA status will be changed when 803105197Ssam * we are refering to one. So calling splsoftnet(). 804105197Ssam */ 805105197Ssam if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 806105197Ssam /* 807105197Ssam * build IPsec tunnel. 808105197Ssam */ 809105197Ssam /* XXX should be processed with other familiy */ 810105197Ssam if (isr->sav->sah->saidx.src.sa.sa_family != AF_INET6) { 811120585Ssam ipseclog((LOG_ERR, "%s: family mismatched between " 812120585Ssam "inner and outer, spi=%u\n", __func__, 813105197Ssam ntohl(isr->sav->spi))); 814181803Sbz V_ipsec6stat.ips_out_inval++; 815105197Ssam error = EAFNOSUPPORT; 816105197Ssam goto bad; 817105197Ssam } 818105197Ssam 819105197Ssam m = ipsec6_splithdr(m); 820105197Ssam if (!m) { 821181803Sbz V_ipsec6stat.ips_out_nomem++; 822105197Ssam error = ENOMEM; 823105197Ssam goto bad; 824105197Ssam } 825105197Ssam error = ipsec6_encapsulate(m, isr->sav); 826105197Ssam if (error) { 827105197Ssam m = NULL; 828105197Ssam goto bad; 829105197Ssam } 830105197Ssam ip6 = mtod(m, struct ip6_hdr *); 831105197Ssam 832105197Ssam state->ro = &isr->sav->sah->sa_route; 833105197Ssam state->dst = (struct sockaddr *)&state->ro->ro_dst; 834105197Ssam dst6 = (struct sockaddr_in6 *)state->dst; 835105197Ssam if (state->ro->ro_rt 836105197Ssam && ((state->ro->ro_rt->rt_flags & RTF_UP) == 0 837105197Ssam || !IN6_ARE_ADDR_EQUAL(&dst6->sin6_addr, &ip6->ip6_dst))) { 838105197Ssam RTFREE(state->ro->ro_rt); 839105197Ssam state->ro->ro_rt = NULL; 840105197Ssam } 841187936Sbz if (state->ro->ro_rt == NULL) { 842105197Ssam bzero(dst6, sizeof(*dst6)); 843105197Ssam dst6->sin6_family = AF_INET6; 844105197Ssam dst6->sin6_len = sizeof(*dst6); 845105197Ssam dst6->sin6_addr = ip6->ip6_dst; 846105197Ssam rtalloc(state->ro); 847105197Ssam } 848187936Sbz if (state->ro->ro_rt == NULL) { 849181803Sbz V_ip6stat.ip6s_noroute++; 850181803Sbz V_ipsec6stat.ips_out_noroute++; 851105197Ssam error = EHOSTUNREACH; 852105197Ssam goto bad; 853105197Ssam } 854105197Ssam 855105197Ssam /* adjust state->dst if tunnel endpoint is offlink */ 856213837Sbz if (state->ro->ro_rt->rt_flags & RTF_GATEWAY) 857105197Ssam state->dst = (struct sockaddr *)state->ro->ro_rt->rt_gateway; 858105197Ssam } 859105197Ssam 860105197Ssam m = ipsec6_splithdr(m); 861105197Ssam if (!m) { 862181803Sbz V_ipsec6stat.ips_out_nomem++; 863105197Ssam error = ENOMEM; 864105197Ssam goto bad; 865105197Ssam } 866105197Ssam ip6 = mtod(m, struct ip6_hdr *); 867174054Sbz 868174054Sbz#ifdef DEV_ENC 869174054Sbz /* pass the mbuf to enc0 for bpf processing */ 870174054Sbz ipsec_bpf(m, isr->sav, AF_INET6, ENC_OUT|ENC_AFTER); 871174054Sbz /* pass the mbuf to enc0 for packet filtering */ 872174054Sbz if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_AFTER)) != 0) 873174054Sbz goto bad; 874174054Sbz#endif 875174054Sbz 876170123Sbz error = (*isr->sav->tdb_xform->xf_output)(m, isr, NULL, 877105197Ssam sizeof (struct ip6_hdr), 878105197Ssam offsetof(struct ip6_hdr, ip6_nxt)); 879170123Sbz IPSECREQUEST_UNLOCK(isr); 880170123Sbz return error; 881105197Ssambad: 882170123Sbz if (isr) 883170123Sbz IPSECREQUEST_UNLOCK(isr); 884105197Ssam if (m) 885105197Ssam m_freem(m); 886105197Ssam state->m = NULL; 887105197Ssam return error; 888105197Ssam} 889105197Ssam#endif /*INET6*/ 890