ipsec_output.c revision 281693
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 281693 2015-04-18 16:46:31Z ae $ 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> 47257176Sglebius#include <net/if_var.h> 48171497Sbz#include <net/pfil.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> 64281692Sae#include <netinet6/scope6_var.h> 65105197Ssam#endif 66105197Ssam#include <netinet/in_pcb.h> 67105197Ssam#ifdef INET6 68105197Ssam#include <netinet/icmp6.h> 69105197Ssam#endif 70105197Ssam 71105197Ssam#include <netipsec/ipsec.h> 72105197Ssam#ifdef INET6 73105197Ssam#include <netipsec/ipsec6.h> 74105197Ssam#endif 75105197Ssam#include <netipsec/ah_var.h> 76105197Ssam#include <netipsec/esp_var.h> 77105197Ssam#include <netipsec/ipcomp_var.h> 78105197Ssam 79105197Ssam#include <netipsec/xform.h> 80105197Ssam 81105197Ssam#include <netipsec/key.h> 82105197Ssam#include <netipsec/keydb.h> 83105197Ssam#include <netipsec/key_debug.h> 84105197Ssam 85105197Ssam#include <machine/in_cksum.h> 86105197Ssam 87194062Svanhu#ifdef IPSEC_NAT_T 88194062Svanhu#include <netinet/udp.h> 89194062Svanhu#endif 90194062Svanhu 91181627Svanhu#ifdef DEV_ENC 92181627Svanhu#include <net/if_enc.h> 93181627Svanhu#endif 94181627Svanhu 95181627Svanhu 96105197Ssamint 97105197Ssamipsec_process_done(struct mbuf *m, struct ipsecrequest *isr) 98105197Ssam{ 99105197Ssam struct tdb_ident *tdbi; 100105197Ssam struct m_tag *mtag; 101105197Ssam struct secasvar *sav; 102105197Ssam struct secasindex *saidx; 103105197Ssam int error; 104105197Ssam 105120585Ssam IPSEC_ASSERT(m != NULL, ("null mbuf")); 106120585Ssam IPSEC_ASSERT(isr != NULL, ("null ISR")); 107105197Ssam sav = isr->sav; 108120585Ssam IPSEC_ASSERT(sav != NULL, ("null SA")); 109120585Ssam IPSEC_ASSERT(sav->sah != NULL, ("null SAH")); 110105197Ssam 111105197Ssam saidx = &sav->sah->saidx; 112105197Ssam switch (saidx->dst.sa.sa_family) { 113105197Ssam#ifdef INET 114105197Ssam case AF_INET: 115105197Ssam /* Fix the header length, for AH processing. */ 116105197Ssam mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len); 117105197Ssam break; 118105197Ssam#endif /* INET */ 119105197Ssam#ifdef INET6 120105197Ssam case AF_INET6: 121105197Ssam /* Fix the header length, for AH processing. */ 122105197Ssam if (m->m_pkthdr.len < sizeof (struct ip6_hdr)) { 123105197Ssam error = ENXIO; 124105197Ssam goto bad; 125105197Ssam } 126105197Ssam if (m->m_pkthdr.len - sizeof (struct ip6_hdr) > IPV6_MAXPACKET) { 127105197Ssam /* No jumbogram support. */ 128105197Ssam error = ENXIO; /*?*/ 129105197Ssam goto bad; 130105197Ssam } 131105197Ssam mtod(m, struct ip6_hdr *)->ip6_plen = 132105197Ssam htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 133105197Ssam break; 134105197Ssam#endif /* INET6 */ 135105197Ssam default: 136120585Ssam DPRINTF(("%s: unknown protocol family %u\n", __func__, 137105197Ssam saidx->dst.sa.sa_family)); 138105197Ssam error = ENXIO; 139105197Ssam goto bad; 140105197Ssam } 141105197Ssam 142105197Ssam /* 143105197Ssam * Add a record of what we've done or what needs to be done to the 144105197Ssam * packet. 145105197Ssam */ 146105197Ssam mtag = m_tag_get(PACKET_TAG_IPSEC_OUT_DONE, 147105197Ssam sizeof(struct tdb_ident), M_NOWAIT); 148105197Ssam if (mtag == NULL) { 149120585Ssam DPRINTF(("%s: could not get packet tag\n", __func__)); 150105197Ssam error = ENOMEM; 151105197Ssam goto bad; 152105197Ssam } 153105197Ssam 154105197Ssam tdbi = (struct tdb_ident *)(mtag + 1); 155105197Ssam tdbi->dst = saidx->dst; 156105197Ssam tdbi->proto = saidx->proto; 157105197Ssam tdbi->spi = sav->spi; 158105197Ssam m_tag_prepend(m, mtag); 159105197Ssam 160105197Ssam /* 161105197Ssam * If there's another (bundled) SA to apply, do so. 162105197Ssam * Note that this puts a burden on the kernel stack size. 163105197Ssam * If this is a problem we'll need to introduce a queue 164105197Ssam * to set the packet on so we can unwind the stack before 165105197Ssam * doing further processing. 166105197Ssam */ 167105197Ssam if (isr->next) { 168238700Sbz /* XXX-BZ currently only support same AF bundles. */ 169221129Sbz switch (saidx->dst.sa.sa_family) { 170221129Sbz#ifdef INET 171221129Sbz case AF_INET: 172274467Sae IPSECSTAT_INC(ips_out_bundlesa); 173275708Sae return ipsec4_process_packet(m, isr->next); 174221129Sbz /* NOTREACHED */ 175221129Sbz#endif 176221129Sbz#ifdef notyet 177221129Sbz#ifdef INET6 178221129Sbz case AF_INET6: 179221129Sbz /* XXX */ 180274467Sae IPSEC6STAT_INC(ips_out_bundlesa); 181266800Svanhu return ipsec6_process_packet(m, isr->next); 182221129Sbz /* NOTREACHED */ 183221129Sbz#endif /* INET6 */ 184221129Sbz#endif 185221129Sbz default: 186221129Sbz DPRINTF(("%s: unknown protocol family %u\n", __func__, 187221129Sbz saidx->dst.sa.sa_family)); 188221129Sbz error = ENXIO; 189221129Sbz goto bad; 190221129Sbz } 191105197Ssam } 192117056Ssam key_sa_recordxfer(sav, m); /* record data transfer */ 193105197Ssam 194105197Ssam /* 195105197Ssam * We're done with IPsec processing, transmit the packet using the 196105197Ssam * appropriate network protocol (IP or IPv6). SPD lookup will be 197105197Ssam * performed again there. 198105197Ssam */ 199105197Ssam switch (saidx->dst.sa.sa_family) { 200105197Ssam#ifdef INET 201105197Ssam case AF_INET: 202194062Svanhu#ifdef IPSEC_NAT_T 203194062Svanhu /* 204194062Svanhu * If NAT-T is enabled, now that all IPsec processing is done 205194062Svanhu * insert UDP encapsulation header after IP header. 206194062Svanhu */ 207194062Svanhu if (sav->natt_type) { 208241919Sglebius struct ip *ip = mtod(m, struct ip *); 209194062Svanhu const int hlen = (ip->ip_hl << 2); 210194062Svanhu int size, off; 211194062Svanhu struct mbuf *mi; 212194062Svanhu struct udphdr *udp; 213194062Svanhu 214194062Svanhu size = sizeof(struct udphdr); 215194062Svanhu if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) { 216194062Svanhu /* 217194062Svanhu * draft-ietf-ipsec-nat-t-ike-0[01].txt and 218194062Svanhu * draft-ietf-ipsec-udp-encaps-(00/)01.txt, 219194062Svanhu * ignoring possible AH mode 220194062Svanhu * non-IKE marker + non-ESP marker 221194062Svanhu * from draft-ietf-ipsec-udp-encaps-00.txt. 222194062Svanhu */ 223194062Svanhu size += sizeof(u_int64_t); 224194062Svanhu } 225194062Svanhu mi = m_makespace(m, hlen, size, &off); 226194062Svanhu if (mi == NULL) { 227194062Svanhu DPRINTF(("%s: m_makespace for udphdr failed\n", 228194062Svanhu __func__)); 229194062Svanhu error = ENOBUFS; 230194062Svanhu goto bad; 231194062Svanhu } 232194062Svanhu 233194062Svanhu udp = (struct udphdr *)(mtod(mi, caddr_t) + off); 234194062Svanhu if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) 235194062Svanhu udp->uh_sport = htons(UDP_ENCAP_ESPINUDP_PORT); 236194062Svanhu else 237194062Svanhu udp->uh_sport = 238194062Svanhu KEY_PORTFROMSADDR(&sav->sah->saidx.src); 239194062Svanhu udp->uh_dport = KEY_PORTFROMSADDR(&sav->sah->saidx.dst); 240194062Svanhu udp->uh_sum = 0; 241194062Svanhu udp->uh_ulen = htons(m->m_pkthdr.len - hlen); 242241919Sglebius ip->ip_len = htons(m->m_pkthdr.len); 243194062Svanhu ip->ip_p = IPPROTO_UDP; 244194062Svanhu 245194062Svanhu if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) 246194062Svanhu *(u_int64_t *)(udp + 1) = 0; 247194062Svanhu } 248194062Svanhu#endif /* IPSEC_NAT_T */ 249194062Svanhu 250105197Ssam return ip_output(m, NULL, NULL, IP_RAWOUTPUT, NULL, NULL); 251105197Ssam#endif /* INET */ 252105197Ssam#ifdef INET6 253105197Ssam case AF_INET6: 254105197Ssam /* 255105197Ssam * We don't need massage, IPv6 header fields are always in 256105197Ssam * net endian. 257105197Ssam */ 258105197Ssam return ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL); 259105197Ssam#endif /* INET6 */ 260105197Ssam } 261105197Ssam panic("ipsec_process_done"); 262105197Ssambad: 263105197Ssam m_freem(m); 264105197Ssam return (error); 265105197Ssam} 266105197Ssam 267105197Ssamstatic struct ipsecrequest * 268105197Ssamipsec_nextisr( 269105197Ssam struct mbuf *m, 270105197Ssam struct ipsecrequest *isr, 271105197Ssam int af, 272105197Ssam struct secasindex *saidx, 273105197Ssam int *error 274105197Ssam) 275105197Ssam{ 276252028Sae#define IPSEC_OSTAT(name) do { \ 277252028Sae if (isr->saidx.proto == IPPROTO_ESP) \ 278252028Sae ESPSTAT_INC(esps_##name); \ 279252028Sae else if (isr->saidx.proto == IPPROTO_AH)\ 280252028Sae AHSTAT_INC(ahs_##name); \ 281252028Sae else \ 282252028Sae IPCOMPSTAT_INC(ipcomps_##name); \ 283252028Sae} while (0) 284105197Ssam struct secasvar *sav; 285105197Ssam 286120585Ssam IPSECREQUEST_LOCK_ASSERT(isr); 287120585Ssam 288120585Ssam IPSEC_ASSERT(af == AF_INET || af == AF_INET6, 289120585Ssam ("invalid address family %u", af)); 290105197Ssamagain: 291105197Ssam /* 292105197Ssam * Craft SA index to search for proper SA. Note that 293105197Ssam * we only fillin unspecified SA peers for transport 294105197Ssam * mode; for tunnel mode they must already be filled in. 295105197Ssam */ 296105197Ssam *saidx = isr->saidx; 297105197Ssam if (isr->saidx.mode == IPSEC_MODE_TRANSPORT) { 298105197Ssam /* Fillin unspecified SA peers only for transport mode */ 299105197Ssam if (af == AF_INET) { 300105197Ssam struct sockaddr_in *sin; 301105197Ssam struct ip *ip = mtod(m, struct ip *); 302105197Ssam 303105197Ssam if (saidx->src.sa.sa_len == 0) { 304105197Ssam sin = &saidx->src.sin; 305105197Ssam sin->sin_len = sizeof(*sin); 306105197Ssam sin->sin_family = AF_INET; 307105197Ssam sin->sin_port = IPSEC_PORT_ANY; 308105197Ssam sin->sin_addr = ip->ip_src; 309105197Ssam } 310105197Ssam if (saidx->dst.sa.sa_len == 0) { 311105197Ssam sin = &saidx->dst.sin; 312105197Ssam sin->sin_len = sizeof(*sin); 313105197Ssam sin->sin_family = AF_INET; 314105197Ssam sin->sin_port = IPSEC_PORT_ANY; 315105197Ssam sin->sin_addr = ip->ip_dst; 316105197Ssam } 317105197Ssam } else { 318105197Ssam struct sockaddr_in6 *sin6; 319105197Ssam struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 320105197Ssam 321105197Ssam if (saidx->src.sin6.sin6_len == 0) { 322105197Ssam sin6 = (struct sockaddr_in6 *)&saidx->src; 323105197Ssam sin6->sin6_len = sizeof(*sin6); 324105197Ssam sin6->sin6_family = AF_INET6; 325105197Ssam sin6->sin6_port = IPSEC_PORT_ANY; 326105197Ssam sin6->sin6_addr = ip6->ip6_src; 327105197Ssam if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 328105197Ssam /* fix scope id for comparing SPD */ 329105197Ssam sin6->sin6_addr.s6_addr16[1] = 0; 330105197Ssam sin6->sin6_scope_id = 331105197Ssam ntohs(ip6->ip6_src.s6_addr16[1]); 332105197Ssam } 333105197Ssam } 334105197Ssam if (saidx->dst.sin6.sin6_len == 0) { 335105197Ssam sin6 = (struct sockaddr_in6 *)&saidx->dst; 336105197Ssam sin6->sin6_len = sizeof(*sin6); 337105197Ssam sin6->sin6_family = AF_INET6; 338105197Ssam sin6->sin6_port = IPSEC_PORT_ANY; 339105197Ssam sin6->sin6_addr = ip6->ip6_dst; 340105197Ssam if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 341105197Ssam /* fix scope id for comparing SPD */ 342105197Ssam sin6->sin6_addr.s6_addr16[1] = 0; 343105197Ssam sin6->sin6_scope_id = 344105197Ssam ntohs(ip6->ip6_dst.s6_addr16[1]); 345105197Ssam } 346105197Ssam } 347105197Ssam } 348105197Ssam } 349105197Ssam 350105197Ssam /* 351105197Ssam * Lookup SA and validate it. 352105197Ssam */ 353105197Ssam *error = key_checkrequest(isr, saidx); 354105197Ssam if (*error != 0) { 355105197Ssam /* 356105197Ssam * IPsec processing is required, but no SA found. 357105197Ssam * I assume that key_acquire() had been called 358105197Ssam * to get/establish the SA. Here I discard 359105197Ssam * this packet because it is responsibility for 360105197Ssam * upper layer to retransmit the packet. 361105197Ssam */ 362274434Sae switch(af) { 363274434Sae case AF_INET: 364274434Sae IPSECSTAT_INC(ips_out_nosa); 365274434Sae break; 366274434Sae#ifdef INET6 367274434Sae case AF_INET6: 368274434Sae IPSEC6STAT_INC(ips_out_nosa); 369274434Sae break; 370274434Sae#endif 371274434Sae } 372105197Ssam goto bad; 373105197Ssam } 374105197Ssam sav = isr->sav; 375177175Sbz if (sav == NULL) { 376120585Ssam IPSEC_ASSERT(ipsec_get_reqlevel(isr) == IPSEC_LEVEL_USE, 377120585Ssam ("no SA found, but required; level %u", 378105197Ssam ipsec_get_reqlevel(isr))); 379120585Ssam IPSECREQUEST_UNLOCK(isr); 380105197Ssam isr = isr->next; 381177175Sbz /* 382177175Sbz * If isr is NULL, we found a 'use' policy w/o SA. 383177175Sbz * Return w/o error and w/o isr so we can drop out 384177175Sbz * and continue w/o IPsec processing. 385177175Sbz */ 386177175Sbz if (isr == NULL) 387105197Ssam return isr; 388120585Ssam IPSECREQUEST_LOCK(isr); 389105197Ssam goto again; 390105197Ssam } 391105197Ssam 392105197Ssam /* 393105197Ssam * Check system global policy controls. 394105197Ssam */ 395181803Sbz if ((isr->saidx.proto == IPPROTO_ESP && !V_esp_enable) || 396181803Sbz (isr->saidx.proto == IPPROTO_AH && !V_ah_enable) || 397181803Sbz (isr->saidx.proto == IPPROTO_IPCOMP && !V_ipcomp_enable)) { 398120585Ssam DPRINTF(("%s: IPsec outbound packet dropped due" 399120585Ssam " to policy (check your sysctls)\n", __func__)); 400252028Sae IPSEC_OSTAT(pdrops); 401105197Ssam *error = EHOSTUNREACH; 402105197Ssam goto bad; 403105197Ssam } 404105197Ssam 405105197Ssam /* 406105197Ssam * Sanity check the SA contents for the caller 407105197Ssam * before they invoke the xform output method. 408105197Ssam */ 409105197Ssam if (sav->tdb_xform == NULL) { 410120585Ssam DPRINTF(("%s: no transform for SA\n", __func__)); 411252028Sae IPSEC_OSTAT(noxform); 412105197Ssam *error = EHOSTUNREACH; 413105197Ssam goto bad; 414105197Ssam } 415105197Ssam return isr; 416105197Ssambad: 417120585Ssam IPSEC_ASSERT(*error != 0, ("error return w/ no error code")); 418120585Ssam IPSECREQUEST_UNLOCK(isr); 419105197Ssam return NULL; 420105197Ssam#undef IPSEC_OSTAT 421105197Ssam} 422105197Ssam 423281692Saestatic int 424281692Saeipsec_encap(struct mbuf **mp, struct secasindex *saidx) 425281692Sae{ 426281692Sae#ifdef INET6 427281692Sae struct ip6_hdr *ip6; 428281692Sae#endif 429281692Sae struct ip *ip; 430281692Sae int setdf; 431281692Sae uint8_t itos, proto; 432281692Sae 433281692Sae ip = mtod(*mp, struct ip *); 434281692Sae switch (ip->ip_v) { 435105197Ssam#ifdef INET 436281692Sae case IPVERSION: 437281692Sae proto = IPPROTO_IPIP; 438281692Sae /* 439281692Sae * Collect IP_DF state from the inner header 440281692Sae * and honor system-wide control of how to handle it. 441281692Sae */ 442281692Sae switch (V_ip4_ipsec_dfbit) { 443281692Sae case 0: /* clear in outer header */ 444281692Sae case 1: /* set in outer header */ 445281692Sae setdf = V_ip4_ipsec_dfbit; 446281692Sae break; 447281692Sae default:/* propagate to outer header */ 448281692Sae setdf = (ip->ip_off & ntohs(IP_DF)) != 0; 449281692Sae } 450281692Sae itos = ip->ip_tos; 451281692Sae break; 452281692Sae#endif 453281692Sae#ifdef INET6 454281692Sae case (IPV6_VERSION >> 4): 455281692Sae proto = IPPROTO_IPV6; 456281692Sae ip6 = mtod(*mp, struct ip6_hdr *); 457281692Sae itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 458281692Sae setdf = V_ip4_ipsec_dfbit ? 1: 0; 459281692Sae /* scoped address handling */ 460281692Sae in6_clearscope(&ip6->ip6_src); 461281692Sae in6_clearscope(&ip6->ip6_dst); 462281692Sae break; 463281692Sae#endif 464281692Sae default: 465281692Sae return (EAFNOSUPPORT); 466281692Sae } 467281692Sae switch (saidx->dst.sa.sa_family) { 468281692Sae#ifdef INET 469281692Sae case AF_INET: 470281692Sae if (saidx->src.sa.sa_family != AF_INET || 471281692Sae saidx->src.sin.sin_addr.s_addr == INADDR_ANY || 472281692Sae saidx->dst.sin.sin_addr.s_addr == INADDR_ANY) 473281692Sae return (EINVAL); 474281692Sae M_PREPEND(*mp, sizeof(struct ip), M_NOWAIT); 475281692Sae if (*mp == NULL) 476281692Sae return (ENOBUFS); 477281692Sae ip = mtod(*mp, struct ip *); 478281692Sae ip->ip_v = IPVERSION; 479281692Sae ip->ip_hl = sizeof(struct ip) >> 2; 480281692Sae ip->ip_p = proto; 481281692Sae ip->ip_len = htons((*mp)->m_pkthdr.len); 482281692Sae ip->ip_ttl = V_ip_defttl; 483281692Sae ip->ip_sum = 0; 484281692Sae ip->ip_off = setdf ? htons(IP_DF): 0; 485281692Sae ip->ip_src = saidx->src.sin.sin_addr; 486281692Sae ip->ip_dst = saidx->dst.sin.sin_addr; 487281692Sae ip_ecn_ingress(V_ip4_ipsec_ecn, &ip->ip_tos, &itos); 488281692Sae ip_fillid(ip); 489281692Sae break; 490281692Sae#endif /* INET */ 491281692Sae#ifdef INET6 492281692Sae case AF_INET6: 493281692Sae if (saidx->src.sa.sa_family != AF_INET6 || 494281692Sae IN6_IS_ADDR_UNSPECIFIED(&saidx->src.sin6.sin6_addr) || 495281692Sae IN6_IS_ADDR_UNSPECIFIED(&saidx->dst.sin6.sin6_addr)) 496281692Sae return (EINVAL); 497281692Sae M_PREPEND(*mp, sizeof(struct ip6_hdr), M_NOWAIT); 498281692Sae if (*mp == NULL) 499281692Sae return (ENOBUFS); 500281692Sae ip6 = mtod(*mp, struct ip6_hdr *); 501281692Sae ip6->ip6_flow = 0; 502281692Sae ip6->ip6_vfc = IPV6_VERSION; 503281692Sae ip6->ip6_hlim = V_ip6_defhlim; 504281692Sae ip6->ip6_nxt = proto; 505281692Sae ip6->ip6_dst = saidx->dst.sin6.sin6_addr; 506281693Sae /* For link-local address embed scope zone id */ 507281693Sae if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 508281693Sae ip6->ip6_dst.s6_addr16[1] = 509281693Sae htons(saidx->dst.sin6.sin6_scope_id & 0xffff); 510281692Sae ip6->ip6_src = saidx->src.sin6.sin6_addr; 511281693Sae if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 512281693Sae ip6->ip6_src.s6_addr16[1] = 513281693Sae htons(saidx->src.sin6.sin6_scope_id & 0xffff); 514281692Sae ip6->ip6_plen = htons((*mp)->m_pkthdr.len - sizeof(*ip6)); 515281692Sae ip_ecn_ingress(V_ip6_ipsec_ecn, &proto, &itos); 516281692Sae ip6->ip6_flow |= htonl((uint32_t)proto << 20); 517281692Sae break; 518281692Sae#endif /* INET6 */ 519281692Sae default: 520281692Sae return (EAFNOSUPPORT); 521281692Sae } 522281692Sae return (0); 523281692Sae} 524281692Sae 525281692Sae#ifdef INET 526105197Ssam/* 527105197Ssam * IPsec output logic for IPv4. 528105197Ssam */ 529105197Ssamint 530275708Saeipsec4_process_packet(struct mbuf *m, struct ipsecrequest *isr) 531105197Ssam{ 532275708Sae union sockaddr_union *dst; 533105197Ssam struct secasindex saidx; 534105197Ssam struct secasvar *sav; 535105197Ssam struct ip *ip; 536281692Sae int error, i, off; 537105197Ssam 538120585Ssam IPSEC_ASSERT(m != NULL, ("null mbuf")); 539120585Ssam IPSEC_ASSERT(isr != NULL, ("null isr")); 540105197Ssam 541120585Ssam IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */ 542105197Ssam 543105197Ssam isr = ipsec_nextisr(m, isr, AF_INET, &saidx, &error); 544177175Sbz if (isr == NULL) { 545177175Sbz if (error != 0) 546177175Sbz goto bad; 547177175Sbz return EJUSTRETURN; 548177175Sbz } 549105197Ssam 550105197Ssam sav = isr->sav; 551275708Sae if (m->m_len < sizeof(struct ip) && 552275708Sae (m = m_pullup(m, sizeof (struct ip))) == NULL) { 553275708Sae error = ENOBUFS; 554275708Sae goto bad; 555275708Sae } 556275708Sae ip = mtod(m, struct ip *); 557275708Sae dst = &sav->sah->saidx.dst; 558159965Sthompsa#ifdef DEV_ENC 559271862Sglebius if_inc_counter(encif, IFCOUNTER_OPACKETS, 1); 560271862Sglebius if_inc_counter(encif, IFCOUNTER_OBYTES, m->m_pkthdr.len); 561181627Svanhu 562174054Sbz /* pass the mbuf to enc0 for bpf processing */ 563174054Sbz ipsec_bpf(m, sav, AF_INET, ENC_OUT|ENC_BEFORE); 564159965Sthompsa /* pass the mbuf to enc0 for packet filtering */ 565174054Sbz if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_BEFORE)) != 0) 566159965Sthompsa goto bad; 567159965Sthompsa#endif 568275708Sae /* Do the appropriate encapsulation, if necessary */ 569275708Sae if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */ 570275708Sae dst->sa.sa_family != AF_INET || /* PF mismatch */ 571275708Sae (dst->sa.sa_family == AF_INET && /* Proxy */ 572275708Sae dst->sin.sin_addr.s_addr != INADDR_ANY && 573275708Sae dst->sin.sin_addr.s_addr != ip->ip_dst.s_addr)) { 574275708Sae /* Fix IPv4 header checksum and length */ 575275708Sae ip->ip_len = htons(m->m_pkthdr.len); 576275708Sae ip->ip_sum = 0; 577275708Sae ip->ip_sum = in_cksum(m, ip->ip_hl << 2); 578281692Sae error = ipsec_encap(&m, &sav->sah->saidx); 579275708Sae if (error != 0) { 580281692Sae DPRINTF(("%s: encapsulation for SA %s->%s " 581281692Sae "SPI 0x%08x failed with error %d\n", __func__, 582281692Sae ipsec_address(&sav->sah->saidx.src), 583281692Sae ipsec_address(&sav->sah->saidx.dst), 584281692Sae ntohl(sav->spi), error)); 585275708Sae goto bad; 586275708Sae } 587105197Ssam } 588159965Sthompsa#ifdef DEV_ENC 589159965Sthompsa /* pass the mbuf to enc0 for bpf processing */ 590266800Svanhu ipsec_bpf(m, sav, sav->sah->saidx.dst.sa.sa_family, ENC_OUT|ENC_AFTER); 591174054Sbz /* pass the mbuf to enc0 for packet filtering */ 592174054Sbz if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_AFTER)) != 0) 593174054Sbz goto bad; 594159965Sthompsa#endif 595159965Sthompsa 596105197Ssam /* 597105197Ssam * Dispatch to the appropriate IPsec transform logic. The 598105197Ssam * packet will be returned for transmission after crypto 599281692Sae * processing, etc. are completed. 600105197Ssam * 601105197Ssam * NB: m & sav are ``passed to caller'' who's reponsible for 602105197Ssam * for reclaiming their resources. 603105197Ssam */ 604281692Sae switch(dst->sa.sa_family) { 605281692Sae case AF_INET: 606281692Sae ip = mtod(m, struct ip *); 607281692Sae i = ip->ip_hl << 2; 608281692Sae off = offsetof(struct ip, ip_p); 609281692Sae break; 610266800Svanhu#ifdef INET6 611281692Sae case AF_INET6: 612281692Sae i = sizeof(struct ip6_hdr); 613281692Sae off = offsetof(struct ip6_hdr, ip6_nxt); 614281692Sae break; 615266800Svanhu#endif /* INET6 */ 616281692Sae default: 617266800Svanhu DPRINTF(("%s: unsupported protocol family %u\n", 618281692Sae __func__, dst->sa.sa_family)); 619281692Sae error = EPFNOSUPPORT; 620281692Sae IPSECSTAT_INC(ips_out_inval); 621281692Sae goto bad; 622105197Ssam } 623281692Sae error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off); 624120585Ssam IPSECREQUEST_UNLOCK(isr); 625281692Sae return (error); 626105197Ssambad: 627120585Ssam if (isr) 628120585Ssam IPSECREQUEST_UNLOCK(isr); 629105197Ssam if (m) 630105197Ssam m_freem(m); 631105197Ssam return error; 632105197Ssam} 633105197Ssam#endif 634105197Ssam 635266800Svanhu 636105197Ssam#ifdef INET6 637105197Ssamstatic int 638266800Svanhuin6_sa_equal_addrwithscope(const struct sockaddr_in6 *sa, const struct in6_addr *ia) 639105197Ssam{ 640266800Svanhu struct in6_addr ia2; 641105197Ssam 642266800Svanhu memcpy(&ia2, &sa->sin6_addr, sizeof(ia2)); 643266800Svanhu if (IN6_IS_SCOPE_LINKLOCAL(&sa->sin6_addr)) 644266800Svanhu ia2.s6_addr16[1] = htons(sa->sin6_scope_id); 645105197Ssam 646266800Svanhu return IN6_ARE_ADDR_EQUAL(ia, &ia2); 647105197Ssam} 648105197Ssam 649105197Ssam/* 650266800Svanhu * IPsec output logic for IPv6. 651105197Ssam */ 652105197Ssamint 653266800Svanhuipsec6_process_packet( 654266800Svanhu struct mbuf *m, 655266800Svanhu struct ipsecrequest *isr 656266800Svanhu ) 657105197Ssam{ 658266800Svanhu struct secasindex saidx; 659266800Svanhu struct secasvar *sav; 660105197Ssam struct ip6_hdr *ip6; 661266800Svanhu int error, i, off; 662266800Svanhu union sockaddr_union *dst; 663105197Ssam 664266800Svanhu IPSEC_ASSERT(m != NULL, ("ipsec6_process_packet: null mbuf")); 665266800Svanhu IPSEC_ASSERT(isr != NULL, ("ipsec6_process_packet: null isr")); 666105197Ssam 667266800Svanhu IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */ 668105197Ssam 669105197Ssam isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error); 670177175Sbz if (isr == NULL) { 671177175Sbz if (error != 0) 672177175Sbz goto bad; 673266800Svanhu return EJUSTRETURN; 674177175Sbz } 675266800Svanhu sav = isr->sav; 676266800Svanhu dst = &sav->sah->saidx.dst; 677266800Svanhu 678274454Sae ip6 = mtod(m, struct ip6_hdr *); 679274454Sae ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(*ip6)); 680174054Sbz#ifdef DEV_ENC 681271862Sglebius if_inc_counter(encif, IFCOUNTER_OPACKETS, 1); 682271862Sglebius if_inc_counter(encif, IFCOUNTER_OBYTES, m->m_pkthdr.len); 683181627Svanhu 684174054Sbz /* pass the mbuf to enc0 for bpf processing */ 685174054Sbz ipsec_bpf(m, isr->sav, AF_INET6, ENC_OUT|ENC_BEFORE); 686174054Sbz /* pass the mbuf to enc0 for packet filtering */ 687174054Sbz if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_BEFORE)) != 0) 688174054Sbz goto bad; 689266800Svanhu#endif /* DEV_ENC */ 690174054Sbz 691266800Svanhu /* Do the appropriate encapsulation, if necessary */ 692266800Svanhu if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */ 693266800Svanhu dst->sa.sa_family != AF_INET6 || /* PF mismatch */ 694266800Svanhu ((dst->sa.sa_family == AF_INET6) && 695266800Svanhu (!IN6_IS_ADDR_UNSPECIFIED(&dst->sin6.sin6_addr)) && 696266800Svanhu (!in6_sa_equal_addrwithscope(&dst->sin6, 697266800Svanhu &ip6->ip6_dst)))) { 698266800Svanhu if (m->m_pkthdr.len - sizeof(*ip6) > IPV6_MAXPACKET) { 699266800Svanhu /* No jumbogram support. */ 700266800Svanhu error = ENXIO; /*XXX*/ 701105197Ssam goto bad; 702105197Ssam } 703281692Sae error = ipsec_encap(&m, &sav->sah->saidx); 704281692Sae if (error != 0) { 705281692Sae DPRINTF(("%s: encapsulation for SA %s->%s " 706281692Sae "SPI 0x%08x failed with error %d\n", __func__, 707281692Sae ipsec_address(&sav->sah->saidx.src), 708281692Sae ipsec_address(&sav->sah->saidx.dst), 709281692Sae ntohl(sav->spi), error)); 710105197Ssam goto bad; 711105197Ssam } 712105197Ssam } 713105197Ssam 714174054Sbz#ifdef DEV_ENC 715266800Svanhu ipsec_bpf(m, isr->sav, dst->sa.sa_family, ENC_OUT|ENC_AFTER); 716174054Sbz /* pass the mbuf to enc0 for packet filtering */ 717174054Sbz if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_AFTER)) != 0) 718174054Sbz goto bad; 719266800Svanhu#endif /* DEV_ENC */ 720174054Sbz 721266800Svanhu switch(dst->sa.sa_family) { 722266800Svanhu#ifdef INET 723266800Svanhu case AF_INET: 724266800Svanhu { 725266800Svanhu struct ip *ip; 726266800Svanhu ip = mtod(m, struct ip *); 727266800Svanhu i = ip->ip_hl << 2; 728266800Svanhu off = offsetof(struct ip, ip_p); 729266800Svanhu } 730266800Svanhu break; 731266800Svanhu#endif /* AF_INET */ 732266800Svanhu case AF_INET6: 733266800Svanhu i = sizeof(struct ip6_hdr); 734266800Svanhu off = offsetof(struct ip6_hdr, ip6_nxt); 735266800Svanhu break; 736266800Svanhu default: 737266800Svanhu DPRINTF(("%s: unsupported protocol family %u\n", 738266800Svanhu __func__, dst->sa.sa_family)); 739266800Svanhu error = EPFNOSUPPORT; 740266800Svanhu IPSEC6STAT_INC(ips_out_inval); 741266800Svanhu goto bad; 742266800Svanhu } 743266800Svanhu error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off); 744170123Sbz IPSECREQUEST_UNLOCK(isr); 745170123Sbz return error; 746105197Ssambad: 747266800Svanhu 748170123Sbz if (isr) 749170123Sbz IPSECREQUEST_UNLOCK(isr); 750105197Ssam if (m) 751105197Ssam m_freem(m); 752105197Ssam return error; 753105197Ssam} 754266822Sbz#endif /*INET6*/ 755