ipsec_output.c revision 282139
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 282139 2015-04-28 11:03:47Z 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")); 107282046Sae IPSEC_ASSERT(isr->sp != NULL, ("NULL isr->sp")); 108105197Ssam sav = isr->sav; 109120585Ssam IPSEC_ASSERT(sav != NULL, ("null SA")); 110120585Ssam IPSEC_ASSERT(sav->sah != NULL, ("null SAH")); 111105197Ssam 112105197Ssam saidx = &sav->sah->saidx; 113105197Ssam switch (saidx->dst.sa.sa_family) { 114105197Ssam#ifdef INET 115105197Ssam case AF_INET: 116105197Ssam /* Fix the header length, for AH processing. */ 117105197Ssam mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len); 118105197Ssam break; 119105197Ssam#endif /* INET */ 120105197Ssam#ifdef INET6 121105197Ssam case AF_INET6: 122105197Ssam /* Fix the header length, for AH processing. */ 123105197Ssam if (m->m_pkthdr.len < sizeof (struct ip6_hdr)) { 124105197Ssam error = ENXIO; 125105197Ssam goto bad; 126105197Ssam } 127105197Ssam if (m->m_pkthdr.len - sizeof (struct ip6_hdr) > IPV6_MAXPACKET) { 128105197Ssam /* No jumbogram support. */ 129105197Ssam error = ENXIO; /*?*/ 130105197Ssam goto bad; 131105197Ssam } 132105197Ssam mtod(m, struct ip6_hdr *)->ip6_plen = 133105197Ssam htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 134105197Ssam break; 135105197Ssam#endif /* INET6 */ 136105197Ssam default: 137120585Ssam DPRINTF(("%s: unknown protocol family %u\n", __func__, 138105197Ssam saidx->dst.sa.sa_family)); 139105197Ssam error = ENXIO; 140105197Ssam goto bad; 141105197Ssam } 142105197Ssam 143105197Ssam /* 144105197Ssam * Add a record of what we've done or what needs to be done to the 145105197Ssam * packet. 146105197Ssam */ 147105197Ssam mtag = m_tag_get(PACKET_TAG_IPSEC_OUT_DONE, 148105197Ssam sizeof(struct tdb_ident), M_NOWAIT); 149105197Ssam if (mtag == NULL) { 150120585Ssam DPRINTF(("%s: could not get packet tag\n", __func__)); 151105197Ssam error = ENOMEM; 152105197Ssam goto bad; 153105197Ssam } 154105197Ssam 155105197Ssam tdbi = (struct tdb_ident *)(mtag + 1); 156105197Ssam tdbi->dst = saidx->dst; 157105197Ssam tdbi->proto = saidx->proto; 158105197Ssam tdbi->spi = sav->spi; 159105197Ssam m_tag_prepend(m, mtag); 160105197Ssam 161105197Ssam /* 162105197Ssam * If there's another (bundled) SA to apply, do so. 163105197Ssam * Note that this puts a burden on the kernel stack size. 164105197Ssam * If this is a problem we'll need to introduce a queue 165105197Ssam * to set the packet on so we can unwind the stack before 166105197Ssam * doing further processing. 167282046Sae * 168282046Sae * If ipsec[46]_process_packet() will successfully queue 169282046Sae * the request, we need to take additional reference to SP, 170282046Sae * because xform callback will release reference. 171105197Ssam */ 172105197Ssam if (isr->next) { 173238700Sbz /* XXX-BZ currently only support same AF bundles. */ 174221129Sbz switch (saidx->dst.sa.sa_family) { 175221129Sbz#ifdef INET 176221129Sbz case AF_INET: 177274467Sae IPSECSTAT_INC(ips_out_bundlesa); 178282046Sae key_addref(isr->sp); 179282046Sae error = ipsec4_process_packet(m, isr->next); 180282046Sae if (error != 0) 181282046Sae KEY_FREESP(&isr->sp); 182282046Sae return (error); 183221129Sbz /* NOTREACHED */ 184221129Sbz#endif 185221129Sbz#ifdef notyet 186221129Sbz#ifdef INET6 187221129Sbz case AF_INET6: 188221129Sbz /* XXX */ 189274467Sae IPSEC6STAT_INC(ips_out_bundlesa); 190282046Sae key_addref(isr->sp); 191282046Sae error = ipsec6_process_packet(m, isr->next); 192282046Sae if (error != 0) 193282046Sae KEY_FREESP(&isr->sp); 194282046Sae return (error); 195221129Sbz /* NOTREACHED */ 196221129Sbz#endif /* INET6 */ 197221129Sbz#endif 198221129Sbz default: 199221129Sbz DPRINTF(("%s: unknown protocol family %u\n", __func__, 200221129Sbz saidx->dst.sa.sa_family)); 201221129Sbz error = ENXIO; 202221129Sbz goto bad; 203221129Sbz } 204105197Ssam } 205117056Ssam key_sa_recordxfer(sav, m); /* record data transfer */ 206105197Ssam 207105197Ssam /* 208105197Ssam * We're done with IPsec processing, transmit the packet using the 209282139Sae * appropriate network protocol (IP or IPv6). 210105197Ssam */ 211105197Ssam switch (saidx->dst.sa.sa_family) { 212105197Ssam#ifdef INET 213105197Ssam case AF_INET: 214194062Svanhu#ifdef IPSEC_NAT_T 215194062Svanhu /* 216194062Svanhu * If NAT-T is enabled, now that all IPsec processing is done 217194062Svanhu * insert UDP encapsulation header after IP header. 218194062Svanhu */ 219194062Svanhu if (sav->natt_type) { 220241919Sglebius struct ip *ip = mtod(m, struct ip *); 221194062Svanhu const int hlen = (ip->ip_hl << 2); 222194062Svanhu int size, off; 223194062Svanhu struct mbuf *mi; 224194062Svanhu struct udphdr *udp; 225194062Svanhu 226194062Svanhu size = sizeof(struct udphdr); 227194062Svanhu if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) { 228194062Svanhu /* 229194062Svanhu * draft-ietf-ipsec-nat-t-ike-0[01].txt and 230194062Svanhu * draft-ietf-ipsec-udp-encaps-(00/)01.txt, 231194062Svanhu * ignoring possible AH mode 232194062Svanhu * non-IKE marker + non-ESP marker 233194062Svanhu * from draft-ietf-ipsec-udp-encaps-00.txt. 234194062Svanhu */ 235194062Svanhu size += sizeof(u_int64_t); 236194062Svanhu } 237194062Svanhu mi = m_makespace(m, hlen, size, &off); 238194062Svanhu if (mi == NULL) { 239194062Svanhu DPRINTF(("%s: m_makespace for udphdr failed\n", 240194062Svanhu __func__)); 241194062Svanhu error = ENOBUFS; 242194062Svanhu goto bad; 243194062Svanhu } 244194062Svanhu 245194062Svanhu udp = (struct udphdr *)(mtod(mi, caddr_t) + off); 246194062Svanhu if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) 247194062Svanhu udp->uh_sport = htons(UDP_ENCAP_ESPINUDP_PORT); 248194062Svanhu else 249194062Svanhu udp->uh_sport = 250194062Svanhu KEY_PORTFROMSADDR(&sav->sah->saidx.src); 251194062Svanhu udp->uh_dport = KEY_PORTFROMSADDR(&sav->sah->saidx.dst); 252194062Svanhu udp->uh_sum = 0; 253194062Svanhu udp->uh_ulen = htons(m->m_pkthdr.len - hlen); 254241919Sglebius ip->ip_len = htons(m->m_pkthdr.len); 255194062Svanhu ip->ip_p = IPPROTO_UDP; 256194062Svanhu 257194062Svanhu if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) 258194062Svanhu *(u_int64_t *)(udp + 1) = 0; 259194062Svanhu } 260194062Svanhu#endif /* IPSEC_NAT_T */ 261194062Svanhu 262105197Ssam return ip_output(m, NULL, NULL, IP_RAWOUTPUT, NULL, NULL); 263105197Ssam#endif /* INET */ 264105197Ssam#ifdef INET6 265105197Ssam case AF_INET6: 266105197Ssam /* 267105197Ssam * We don't need massage, IPv6 header fields are always in 268105197Ssam * net endian. 269105197Ssam */ 270105197Ssam return ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL); 271105197Ssam#endif /* INET6 */ 272105197Ssam } 273105197Ssam panic("ipsec_process_done"); 274105197Ssambad: 275105197Ssam m_freem(m); 276105197Ssam return (error); 277105197Ssam} 278105197Ssam 279105197Ssamstatic struct ipsecrequest * 280105197Ssamipsec_nextisr( 281105197Ssam struct mbuf *m, 282105197Ssam struct ipsecrequest *isr, 283105197Ssam int af, 284105197Ssam struct secasindex *saidx, 285105197Ssam int *error 286105197Ssam) 287105197Ssam{ 288252028Sae#define IPSEC_OSTAT(name) do { \ 289252028Sae if (isr->saidx.proto == IPPROTO_ESP) \ 290252028Sae ESPSTAT_INC(esps_##name); \ 291252028Sae else if (isr->saidx.proto == IPPROTO_AH)\ 292252028Sae AHSTAT_INC(ahs_##name); \ 293252028Sae else \ 294252028Sae IPCOMPSTAT_INC(ipcomps_##name); \ 295252028Sae} while (0) 296105197Ssam struct secasvar *sav; 297105197Ssam 298120585Ssam IPSECREQUEST_LOCK_ASSERT(isr); 299120585Ssam 300120585Ssam IPSEC_ASSERT(af == AF_INET || af == AF_INET6, 301120585Ssam ("invalid address family %u", af)); 302105197Ssamagain: 303105197Ssam /* 304105197Ssam * Craft SA index to search for proper SA. Note that 305105197Ssam * we only fillin unspecified SA peers for transport 306105197Ssam * mode; for tunnel mode they must already be filled in. 307105197Ssam */ 308105197Ssam *saidx = isr->saidx; 309105197Ssam if (isr->saidx.mode == IPSEC_MODE_TRANSPORT) { 310105197Ssam /* Fillin unspecified SA peers only for transport mode */ 311105197Ssam if (af == AF_INET) { 312105197Ssam struct sockaddr_in *sin; 313105197Ssam struct ip *ip = mtod(m, struct ip *); 314105197Ssam 315105197Ssam if (saidx->src.sa.sa_len == 0) { 316105197Ssam sin = &saidx->src.sin; 317105197Ssam sin->sin_len = sizeof(*sin); 318105197Ssam sin->sin_family = AF_INET; 319105197Ssam sin->sin_port = IPSEC_PORT_ANY; 320105197Ssam sin->sin_addr = ip->ip_src; 321105197Ssam } 322105197Ssam if (saidx->dst.sa.sa_len == 0) { 323105197Ssam sin = &saidx->dst.sin; 324105197Ssam sin->sin_len = sizeof(*sin); 325105197Ssam sin->sin_family = AF_INET; 326105197Ssam sin->sin_port = IPSEC_PORT_ANY; 327105197Ssam sin->sin_addr = ip->ip_dst; 328105197Ssam } 329105197Ssam } else { 330105197Ssam struct sockaddr_in6 *sin6; 331105197Ssam struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 332105197Ssam 333105197Ssam if (saidx->src.sin6.sin6_len == 0) { 334105197Ssam sin6 = (struct sockaddr_in6 *)&saidx->src; 335105197Ssam sin6->sin6_len = sizeof(*sin6); 336105197Ssam sin6->sin6_family = AF_INET6; 337105197Ssam sin6->sin6_port = IPSEC_PORT_ANY; 338105197Ssam sin6->sin6_addr = ip6->ip6_src; 339105197Ssam if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 340105197Ssam /* fix scope id for comparing SPD */ 341105197Ssam sin6->sin6_addr.s6_addr16[1] = 0; 342105197Ssam sin6->sin6_scope_id = 343105197Ssam ntohs(ip6->ip6_src.s6_addr16[1]); 344105197Ssam } 345105197Ssam } 346105197Ssam if (saidx->dst.sin6.sin6_len == 0) { 347105197Ssam sin6 = (struct sockaddr_in6 *)&saidx->dst; 348105197Ssam sin6->sin6_len = sizeof(*sin6); 349105197Ssam sin6->sin6_family = AF_INET6; 350105197Ssam sin6->sin6_port = IPSEC_PORT_ANY; 351105197Ssam sin6->sin6_addr = ip6->ip6_dst; 352105197Ssam if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 353105197Ssam /* fix scope id for comparing SPD */ 354105197Ssam sin6->sin6_addr.s6_addr16[1] = 0; 355105197Ssam sin6->sin6_scope_id = 356105197Ssam ntohs(ip6->ip6_dst.s6_addr16[1]); 357105197Ssam } 358105197Ssam } 359105197Ssam } 360105197Ssam } 361105197Ssam 362105197Ssam /* 363105197Ssam * Lookup SA and validate it. 364105197Ssam */ 365105197Ssam *error = key_checkrequest(isr, saidx); 366105197Ssam if (*error != 0) { 367105197Ssam /* 368105197Ssam * IPsec processing is required, but no SA found. 369105197Ssam * I assume that key_acquire() had been called 370105197Ssam * to get/establish the SA. Here I discard 371105197Ssam * this packet because it is responsibility for 372105197Ssam * upper layer to retransmit the packet. 373105197Ssam */ 374274434Sae switch(af) { 375274434Sae case AF_INET: 376274434Sae IPSECSTAT_INC(ips_out_nosa); 377274434Sae break; 378274434Sae#ifdef INET6 379274434Sae case AF_INET6: 380274434Sae IPSEC6STAT_INC(ips_out_nosa); 381274434Sae break; 382274434Sae#endif 383274434Sae } 384105197Ssam goto bad; 385105197Ssam } 386105197Ssam sav = isr->sav; 387177175Sbz if (sav == NULL) { 388120585Ssam IPSEC_ASSERT(ipsec_get_reqlevel(isr) == IPSEC_LEVEL_USE, 389120585Ssam ("no SA found, but required; level %u", 390105197Ssam ipsec_get_reqlevel(isr))); 391120585Ssam IPSECREQUEST_UNLOCK(isr); 392105197Ssam isr = isr->next; 393177175Sbz /* 394177175Sbz * If isr is NULL, we found a 'use' policy w/o SA. 395177175Sbz * Return w/o error and w/o isr so we can drop out 396177175Sbz * and continue w/o IPsec processing. 397177175Sbz */ 398177175Sbz if (isr == NULL) 399105197Ssam return isr; 400120585Ssam IPSECREQUEST_LOCK(isr); 401105197Ssam goto again; 402105197Ssam } 403105197Ssam 404105197Ssam /* 405105197Ssam * Check system global policy controls. 406105197Ssam */ 407181803Sbz if ((isr->saidx.proto == IPPROTO_ESP && !V_esp_enable) || 408181803Sbz (isr->saidx.proto == IPPROTO_AH && !V_ah_enable) || 409181803Sbz (isr->saidx.proto == IPPROTO_IPCOMP && !V_ipcomp_enable)) { 410120585Ssam DPRINTF(("%s: IPsec outbound packet dropped due" 411120585Ssam " to policy (check your sysctls)\n", __func__)); 412252028Sae IPSEC_OSTAT(pdrops); 413105197Ssam *error = EHOSTUNREACH; 414105197Ssam goto bad; 415105197Ssam } 416105197Ssam 417105197Ssam /* 418105197Ssam * Sanity check the SA contents for the caller 419105197Ssam * before they invoke the xform output method. 420105197Ssam */ 421105197Ssam if (sav->tdb_xform == NULL) { 422120585Ssam DPRINTF(("%s: no transform for SA\n", __func__)); 423252028Sae IPSEC_OSTAT(noxform); 424105197Ssam *error = EHOSTUNREACH; 425105197Ssam goto bad; 426105197Ssam } 427105197Ssam return isr; 428105197Ssambad: 429120585Ssam IPSEC_ASSERT(*error != 0, ("error return w/ no error code")); 430120585Ssam IPSECREQUEST_UNLOCK(isr); 431105197Ssam return NULL; 432105197Ssam#undef IPSEC_OSTAT 433105197Ssam} 434105197Ssam 435281692Saestatic int 436281692Saeipsec_encap(struct mbuf **mp, struct secasindex *saidx) 437281692Sae{ 438281692Sae#ifdef INET6 439281692Sae struct ip6_hdr *ip6; 440281692Sae#endif 441281692Sae struct ip *ip; 442281692Sae int setdf; 443281692Sae uint8_t itos, proto; 444281692Sae 445281692Sae ip = mtod(*mp, struct ip *); 446281692Sae switch (ip->ip_v) { 447105197Ssam#ifdef INET 448281692Sae case IPVERSION: 449281692Sae proto = IPPROTO_IPIP; 450281692Sae /* 451281692Sae * Collect IP_DF state from the inner header 452281692Sae * and honor system-wide control of how to handle it. 453281692Sae */ 454281692Sae switch (V_ip4_ipsec_dfbit) { 455281692Sae case 0: /* clear in outer header */ 456281692Sae case 1: /* set in outer header */ 457281692Sae setdf = V_ip4_ipsec_dfbit; 458281692Sae break; 459281692Sae default:/* propagate to outer header */ 460281692Sae setdf = (ip->ip_off & ntohs(IP_DF)) != 0; 461281692Sae } 462281692Sae itos = ip->ip_tos; 463281692Sae break; 464281692Sae#endif 465281692Sae#ifdef INET6 466281692Sae case (IPV6_VERSION >> 4): 467281692Sae proto = IPPROTO_IPV6; 468281692Sae ip6 = mtod(*mp, struct ip6_hdr *); 469281692Sae itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 470281692Sae setdf = V_ip4_ipsec_dfbit ? 1: 0; 471281692Sae /* scoped address handling */ 472281692Sae in6_clearscope(&ip6->ip6_src); 473281692Sae in6_clearscope(&ip6->ip6_dst); 474281692Sae break; 475281692Sae#endif 476281692Sae default: 477281692Sae return (EAFNOSUPPORT); 478281692Sae } 479281692Sae switch (saidx->dst.sa.sa_family) { 480281692Sae#ifdef INET 481281692Sae case AF_INET: 482281692Sae if (saidx->src.sa.sa_family != AF_INET || 483281692Sae saidx->src.sin.sin_addr.s_addr == INADDR_ANY || 484281692Sae saidx->dst.sin.sin_addr.s_addr == INADDR_ANY) 485281692Sae return (EINVAL); 486281692Sae M_PREPEND(*mp, sizeof(struct ip), M_NOWAIT); 487281692Sae if (*mp == NULL) 488281692Sae return (ENOBUFS); 489281692Sae ip = mtod(*mp, struct ip *); 490281692Sae ip->ip_v = IPVERSION; 491281692Sae ip->ip_hl = sizeof(struct ip) >> 2; 492281692Sae ip->ip_p = proto; 493281692Sae ip->ip_len = htons((*mp)->m_pkthdr.len); 494281692Sae ip->ip_ttl = V_ip_defttl; 495281692Sae ip->ip_sum = 0; 496281692Sae ip->ip_off = setdf ? htons(IP_DF): 0; 497281692Sae ip->ip_src = saidx->src.sin.sin_addr; 498281692Sae ip->ip_dst = saidx->dst.sin.sin_addr; 499281692Sae ip_ecn_ingress(V_ip4_ipsec_ecn, &ip->ip_tos, &itos); 500281692Sae ip_fillid(ip); 501281692Sae break; 502281692Sae#endif /* INET */ 503281692Sae#ifdef INET6 504281692Sae case AF_INET6: 505281692Sae if (saidx->src.sa.sa_family != AF_INET6 || 506281692Sae IN6_IS_ADDR_UNSPECIFIED(&saidx->src.sin6.sin6_addr) || 507281692Sae IN6_IS_ADDR_UNSPECIFIED(&saidx->dst.sin6.sin6_addr)) 508281692Sae return (EINVAL); 509281692Sae M_PREPEND(*mp, sizeof(struct ip6_hdr), M_NOWAIT); 510281692Sae if (*mp == NULL) 511281692Sae return (ENOBUFS); 512281692Sae ip6 = mtod(*mp, struct ip6_hdr *); 513281692Sae ip6->ip6_flow = 0; 514281692Sae ip6->ip6_vfc = IPV6_VERSION; 515281692Sae ip6->ip6_hlim = V_ip6_defhlim; 516281692Sae ip6->ip6_nxt = proto; 517281692Sae ip6->ip6_dst = saidx->dst.sin6.sin6_addr; 518281693Sae /* For link-local address embed scope zone id */ 519281693Sae if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 520281693Sae ip6->ip6_dst.s6_addr16[1] = 521281693Sae htons(saidx->dst.sin6.sin6_scope_id & 0xffff); 522281692Sae ip6->ip6_src = saidx->src.sin6.sin6_addr; 523281693Sae if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 524281693Sae ip6->ip6_src.s6_addr16[1] = 525281693Sae htons(saidx->src.sin6.sin6_scope_id & 0xffff); 526281692Sae ip6->ip6_plen = htons((*mp)->m_pkthdr.len - sizeof(*ip6)); 527281692Sae ip_ecn_ingress(V_ip6_ipsec_ecn, &proto, &itos); 528281692Sae ip6->ip6_flow |= htonl((uint32_t)proto << 20); 529281692Sae break; 530281692Sae#endif /* INET6 */ 531281692Sae default: 532281692Sae return (EAFNOSUPPORT); 533281692Sae } 534281692Sae return (0); 535281692Sae} 536281692Sae 537281692Sae#ifdef INET 538105197Ssam/* 539105197Ssam * IPsec output logic for IPv4. 540105197Ssam */ 541105197Ssamint 542275708Saeipsec4_process_packet(struct mbuf *m, struct ipsecrequest *isr) 543105197Ssam{ 544281695Sae char sbuf[INET6_ADDRSTRLEN], dbuf[INET6_ADDRSTRLEN]; 545275708Sae union sockaddr_union *dst; 546105197Ssam struct secasindex saidx; 547105197Ssam struct secasvar *sav; 548105197Ssam struct ip *ip; 549281692Sae int error, i, off; 550105197Ssam 551120585Ssam IPSEC_ASSERT(m != NULL, ("null mbuf")); 552120585Ssam IPSEC_ASSERT(isr != NULL, ("null isr")); 553105197Ssam 554120585Ssam IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */ 555105197Ssam 556105197Ssam isr = ipsec_nextisr(m, isr, AF_INET, &saidx, &error); 557177175Sbz if (isr == NULL) { 558177175Sbz if (error != 0) 559177175Sbz goto bad; 560177175Sbz return EJUSTRETURN; 561177175Sbz } 562105197Ssam 563105197Ssam sav = isr->sav; 564275708Sae if (m->m_len < sizeof(struct ip) && 565275708Sae (m = m_pullup(m, sizeof (struct ip))) == NULL) { 566275708Sae error = ENOBUFS; 567275708Sae goto bad; 568275708Sae } 569275708Sae ip = mtod(m, struct ip *); 570275708Sae dst = &sav->sah->saidx.dst; 571159965Sthompsa#ifdef DEV_ENC 572271862Sglebius if_inc_counter(encif, IFCOUNTER_OPACKETS, 1); 573271862Sglebius if_inc_counter(encif, IFCOUNTER_OBYTES, m->m_pkthdr.len); 574181627Svanhu 575174054Sbz /* pass the mbuf to enc0 for bpf processing */ 576174054Sbz ipsec_bpf(m, sav, AF_INET, ENC_OUT|ENC_BEFORE); 577159965Sthompsa /* pass the mbuf to enc0 for packet filtering */ 578174054Sbz if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_BEFORE)) != 0) 579159965Sthompsa goto bad; 580282132Sae ip = mtod(m, struct ip *); 581159965Sthompsa#endif 582275708Sae /* Do the appropriate encapsulation, if necessary */ 583275708Sae if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */ 584275708Sae dst->sa.sa_family != AF_INET || /* PF mismatch */ 585275708Sae (dst->sa.sa_family == AF_INET && /* Proxy */ 586275708Sae dst->sin.sin_addr.s_addr != INADDR_ANY && 587275708Sae dst->sin.sin_addr.s_addr != ip->ip_dst.s_addr)) { 588275708Sae /* Fix IPv4 header checksum and length */ 589275708Sae ip->ip_len = htons(m->m_pkthdr.len); 590275708Sae ip->ip_sum = 0; 591275708Sae ip->ip_sum = in_cksum(m, ip->ip_hl << 2); 592281692Sae error = ipsec_encap(&m, &sav->sah->saidx); 593275708Sae if (error != 0) { 594281692Sae DPRINTF(("%s: encapsulation for SA %s->%s " 595281692Sae "SPI 0x%08x failed with error %d\n", __func__, 596281695Sae ipsec_address(&sav->sah->saidx.src, sbuf, 597281695Sae sizeof(sbuf)), 598281695Sae ipsec_address(&sav->sah->saidx.dst, dbuf, 599281695Sae sizeof(dbuf)), ntohl(sav->spi), error)); 600275708Sae goto bad; 601275708Sae } 602105197Ssam } 603159965Sthompsa#ifdef DEV_ENC 604159965Sthompsa /* pass the mbuf to enc0 for bpf processing */ 605266800Svanhu ipsec_bpf(m, sav, sav->sah->saidx.dst.sa.sa_family, ENC_OUT|ENC_AFTER); 606174054Sbz /* pass the mbuf to enc0 for packet filtering */ 607174054Sbz if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_AFTER)) != 0) 608174054Sbz goto bad; 609159965Sthompsa#endif 610159965Sthompsa 611105197Ssam /* 612105197Ssam * Dispatch to the appropriate IPsec transform logic. The 613105197Ssam * packet will be returned for transmission after crypto 614281692Sae * processing, etc. are completed. 615105197Ssam * 616105197Ssam * NB: m & sav are ``passed to caller'' who's reponsible for 617105197Ssam * for reclaiming their resources. 618105197Ssam */ 619281692Sae switch(dst->sa.sa_family) { 620281692Sae case AF_INET: 621281692Sae ip = mtod(m, struct ip *); 622281692Sae i = ip->ip_hl << 2; 623281692Sae off = offsetof(struct ip, ip_p); 624281692Sae break; 625266800Svanhu#ifdef INET6 626281692Sae case AF_INET6: 627281692Sae i = sizeof(struct ip6_hdr); 628281692Sae off = offsetof(struct ip6_hdr, ip6_nxt); 629281692Sae break; 630266800Svanhu#endif /* INET6 */ 631281692Sae default: 632266800Svanhu DPRINTF(("%s: unsupported protocol family %u\n", 633281692Sae __func__, dst->sa.sa_family)); 634281692Sae error = EPFNOSUPPORT; 635281692Sae IPSECSTAT_INC(ips_out_inval); 636281692Sae goto bad; 637105197Ssam } 638281692Sae error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off); 639120585Ssam IPSECREQUEST_UNLOCK(isr); 640281692Sae return (error); 641105197Ssambad: 642120585Ssam if (isr) 643120585Ssam IPSECREQUEST_UNLOCK(isr); 644105197Ssam if (m) 645105197Ssam m_freem(m); 646105197Ssam return error; 647105197Ssam} 648105197Ssam#endif 649105197Ssam 650266800Svanhu 651105197Ssam#ifdef INET6 652105197Ssamstatic int 653266800Svanhuin6_sa_equal_addrwithscope(const struct sockaddr_in6 *sa, const struct in6_addr *ia) 654105197Ssam{ 655266800Svanhu struct in6_addr ia2; 656105197Ssam 657266800Svanhu memcpy(&ia2, &sa->sin6_addr, sizeof(ia2)); 658266800Svanhu if (IN6_IS_SCOPE_LINKLOCAL(&sa->sin6_addr)) 659266800Svanhu ia2.s6_addr16[1] = htons(sa->sin6_scope_id); 660105197Ssam 661266800Svanhu return IN6_ARE_ADDR_EQUAL(ia, &ia2); 662105197Ssam} 663105197Ssam 664105197Ssam/* 665266800Svanhu * IPsec output logic for IPv6. 666105197Ssam */ 667105197Ssamint 668281695Saeipsec6_process_packet(struct mbuf *m, struct ipsecrequest *isr) 669105197Ssam{ 670281695Sae char sbuf[INET6_ADDRSTRLEN], dbuf[INET6_ADDRSTRLEN]; 671266800Svanhu struct secasindex saidx; 672266800Svanhu struct secasvar *sav; 673105197Ssam struct ip6_hdr *ip6; 674266800Svanhu int error, i, off; 675266800Svanhu union sockaddr_union *dst; 676105197Ssam 677266800Svanhu IPSEC_ASSERT(m != NULL, ("ipsec6_process_packet: null mbuf")); 678266800Svanhu IPSEC_ASSERT(isr != NULL, ("ipsec6_process_packet: null isr")); 679105197Ssam 680266800Svanhu IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */ 681105197Ssam 682105197Ssam isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error); 683177175Sbz if (isr == NULL) { 684177175Sbz if (error != 0) 685177175Sbz goto bad; 686266800Svanhu return EJUSTRETURN; 687177175Sbz } 688266800Svanhu sav = isr->sav; 689266800Svanhu dst = &sav->sah->saidx.dst; 690266800Svanhu 691274454Sae ip6 = mtod(m, struct ip6_hdr *); 692274454Sae ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(*ip6)); 693174054Sbz#ifdef DEV_ENC 694271862Sglebius if_inc_counter(encif, IFCOUNTER_OPACKETS, 1); 695271862Sglebius if_inc_counter(encif, IFCOUNTER_OBYTES, m->m_pkthdr.len); 696181627Svanhu 697174054Sbz /* pass the mbuf to enc0 for bpf processing */ 698174054Sbz ipsec_bpf(m, isr->sav, AF_INET6, ENC_OUT|ENC_BEFORE); 699174054Sbz /* pass the mbuf to enc0 for packet filtering */ 700174054Sbz if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_BEFORE)) != 0) 701174054Sbz goto bad; 702282132Sae ip6 = mtod(m, struct ip6_hdr *); 703266800Svanhu#endif /* DEV_ENC */ 704174054Sbz 705266800Svanhu /* Do the appropriate encapsulation, if necessary */ 706266800Svanhu if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */ 707266800Svanhu dst->sa.sa_family != AF_INET6 || /* PF mismatch */ 708266800Svanhu ((dst->sa.sa_family == AF_INET6) && 709266800Svanhu (!IN6_IS_ADDR_UNSPECIFIED(&dst->sin6.sin6_addr)) && 710266800Svanhu (!in6_sa_equal_addrwithscope(&dst->sin6, 711266800Svanhu &ip6->ip6_dst)))) { 712266800Svanhu if (m->m_pkthdr.len - sizeof(*ip6) > IPV6_MAXPACKET) { 713266800Svanhu /* No jumbogram support. */ 714266800Svanhu error = ENXIO; /*XXX*/ 715105197Ssam goto bad; 716105197Ssam } 717281692Sae error = ipsec_encap(&m, &sav->sah->saidx); 718281692Sae if (error != 0) { 719281692Sae DPRINTF(("%s: encapsulation for SA %s->%s " 720281692Sae "SPI 0x%08x failed with error %d\n", __func__, 721281695Sae ipsec_address(&sav->sah->saidx.src, sbuf, 722281695Sae sizeof(sbuf)), 723281695Sae ipsec_address(&sav->sah->saidx.dst, dbuf, 724281695Sae sizeof(dbuf)), ntohl(sav->spi), error)); 725105197Ssam goto bad; 726105197Ssam } 727105197Ssam } 728105197Ssam 729174054Sbz#ifdef DEV_ENC 730266800Svanhu ipsec_bpf(m, isr->sav, dst->sa.sa_family, ENC_OUT|ENC_AFTER); 731174054Sbz /* pass the mbuf to enc0 for packet filtering */ 732174054Sbz if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_AFTER)) != 0) 733174054Sbz goto bad; 734266800Svanhu#endif /* DEV_ENC */ 735174054Sbz 736266800Svanhu switch(dst->sa.sa_family) { 737266800Svanhu#ifdef INET 738266800Svanhu case AF_INET: 739266800Svanhu { 740266800Svanhu struct ip *ip; 741266800Svanhu ip = mtod(m, struct ip *); 742266800Svanhu i = ip->ip_hl << 2; 743266800Svanhu off = offsetof(struct ip, ip_p); 744266800Svanhu } 745266800Svanhu break; 746266800Svanhu#endif /* AF_INET */ 747266800Svanhu case AF_INET6: 748266800Svanhu i = sizeof(struct ip6_hdr); 749266800Svanhu off = offsetof(struct ip6_hdr, ip6_nxt); 750266800Svanhu break; 751266800Svanhu default: 752266800Svanhu DPRINTF(("%s: unsupported protocol family %u\n", 753266800Svanhu __func__, dst->sa.sa_family)); 754266800Svanhu error = EPFNOSUPPORT; 755266800Svanhu IPSEC6STAT_INC(ips_out_inval); 756266800Svanhu goto bad; 757266800Svanhu } 758266800Svanhu error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off); 759170123Sbz IPSECREQUEST_UNLOCK(isr); 760170123Sbz return error; 761105197Ssambad: 762266800Svanhu 763170123Sbz if (isr) 764170123Sbz IPSECREQUEST_UNLOCK(isr); 765105197Ssam if (m) 766105197Ssam m_freem(m); 767105197Ssam return error; 768105197Ssam} 769266822Sbz#endif /*INET6*/ 770