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 * $FreeBSD$ 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) { 167252692Sae IPSECSTAT_INC(ips_out_bundlesa); 168238777Sbz /* XXX-BZ currently only support same AF bundles. */ 169221129Sbz switch (saidx->dst.sa.sa_family) { 170221129Sbz#ifdef INET 171221129Sbz case AF_INET: 172221129Sbz return ipsec4_process_packet(m, isr->next, 0, 0); 173221129Sbz /* NOTREACHED */ 174221129Sbz#endif 175221129Sbz#ifdef notyet 176221129Sbz#ifdef INET6 177221129Sbz case AF_INET6: 178221129Sbz /* XXX */ 179221129Sbz ipsec6_output_trans() 180221129Sbz ipsec6_output_tunnel() 181221129Sbz /* NOTREACHED */ 182221129Sbz#endif /* INET6 */ 183221129Sbz#endif 184221129Sbz default: 185221129Sbz DPRINTF(("%s: unknown protocol family %u\n", __func__, 186221129Sbz saidx->dst.sa.sa_family)); 187221129Sbz error = ENXIO; 188221129Sbz goto bad; 189221129Sbz } 190105197Ssam } 191117056Ssam key_sa_recordxfer(sav, m); /* record data transfer */ 192105197Ssam 193223637Sbz m_addr_changed(m); 194223637Sbz 195105197Ssam /* 196105197Ssam * We're done with IPsec processing, transmit the packet using the 197105197Ssam * appropriate network protocol (IP or IPv6). SPD lookup will be 198105197Ssam * performed again there. 199105197Ssam */ 200105197Ssam switch (saidx->dst.sa.sa_family) { 201105197Ssam#ifdef INET 202105197Ssam struct ip *ip; 203105197Ssam case AF_INET: 204105197Ssam ip = mtod(m, struct ip *); 205105197Ssam ip->ip_len = ntohs(ip->ip_len); 206105197Ssam ip->ip_off = ntohs(ip->ip_off); 207105197Ssam 208194062Svanhu#ifdef IPSEC_NAT_T 209194062Svanhu /* 210194062Svanhu * If NAT-T is enabled, now that all IPsec processing is done 211194062Svanhu * insert UDP encapsulation header after IP header. 212194062Svanhu */ 213194062Svanhu if (sav->natt_type) { 214194062Svanhu const int hlen = (ip->ip_hl << 2); 215194062Svanhu int size, off; 216194062Svanhu struct mbuf *mi; 217194062Svanhu struct udphdr *udp; 218194062Svanhu 219194062Svanhu size = sizeof(struct udphdr); 220194062Svanhu if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) { 221194062Svanhu /* 222194062Svanhu * draft-ietf-ipsec-nat-t-ike-0[01].txt and 223194062Svanhu * draft-ietf-ipsec-udp-encaps-(00/)01.txt, 224194062Svanhu * ignoring possible AH mode 225194062Svanhu * non-IKE marker + non-ESP marker 226194062Svanhu * from draft-ietf-ipsec-udp-encaps-00.txt. 227194062Svanhu */ 228194062Svanhu size += sizeof(u_int64_t); 229194062Svanhu } 230194062Svanhu mi = m_makespace(m, hlen, size, &off); 231194062Svanhu if (mi == NULL) { 232194062Svanhu DPRINTF(("%s: m_makespace for udphdr failed\n", 233194062Svanhu __func__)); 234194062Svanhu error = ENOBUFS; 235194062Svanhu goto bad; 236194062Svanhu } 237194062Svanhu 238194062Svanhu udp = (struct udphdr *)(mtod(mi, caddr_t) + off); 239194062Svanhu if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) 240194062Svanhu udp->uh_sport = htons(UDP_ENCAP_ESPINUDP_PORT); 241194062Svanhu else 242194062Svanhu udp->uh_sport = 243194062Svanhu KEY_PORTFROMSADDR(&sav->sah->saidx.src); 244194062Svanhu udp->uh_dport = KEY_PORTFROMSADDR(&sav->sah->saidx.dst); 245194062Svanhu udp->uh_sum = 0; 246194062Svanhu udp->uh_ulen = htons(m->m_pkthdr.len - hlen); 247194062Svanhu ip->ip_len = m->m_pkthdr.len; 248194062Svanhu ip->ip_p = IPPROTO_UDP; 249194062Svanhu 250194062Svanhu if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) 251194062Svanhu *(u_int64_t *)(udp + 1) = 0; 252194062Svanhu } 253194062Svanhu#endif /* IPSEC_NAT_T */ 254194062Svanhu 255105197Ssam return ip_output(m, NULL, NULL, IP_RAWOUTPUT, NULL, NULL); 256105197Ssam#endif /* INET */ 257105197Ssam#ifdef INET6 258105197Ssam case AF_INET6: 259105197Ssam /* 260105197Ssam * We don't need massage, IPv6 header fields are always in 261105197Ssam * net endian. 262105197Ssam */ 263105197Ssam return ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL); 264105197Ssam#endif /* INET6 */ 265105197Ssam } 266105197Ssam panic("ipsec_process_done"); 267105197Ssambad: 268105197Ssam m_freem(m); 269105197Ssam return (error); 270105197Ssam} 271105197Ssam 272105197Ssamstatic struct ipsecrequest * 273105197Ssamipsec_nextisr( 274105197Ssam struct mbuf *m, 275105197Ssam struct ipsecrequest *isr, 276105197Ssam int af, 277105197Ssam struct secasindex *saidx, 278105197Ssam int *error 279105197Ssam) 280105197Ssam{ 281252693Sae#define IPSEC_OSTAT(name) do { \ 282252693Sae if (isr->saidx.proto == IPPROTO_ESP) \ 283252693Sae ESPSTAT_INC(esps_##name); \ 284252693Sae else if (isr->saidx.proto == IPPROTO_AH)\ 285252693Sae AHSTAT_INC(ahs_##name); \ 286252693Sae else \ 287252693Sae IPCOMPSTAT_INC(ipcomps_##name); \ 288252693Sae} while (0) 289105197Ssam struct secasvar *sav; 290105197Ssam 291120585Ssam IPSECREQUEST_LOCK_ASSERT(isr); 292120585Ssam 293120585Ssam IPSEC_ASSERT(af == AF_INET || af == AF_INET6, 294120585Ssam ("invalid address family %u", af)); 295105197Ssamagain: 296105197Ssam /* 297105197Ssam * Craft SA index to search for proper SA. Note that 298105197Ssam * we only fillin unspecified SA peers for transport 299105197Ssam * mode; for tunnel mode they must already be filled in. 300105197Ssam */ 301105197Ssam *saidx = isr->saidx; 302105197Ssam if (isr->saidx.mode == IPSEC_MODE_TRANSPORT) { 303105197Ssam /* Fillin unspecified SA peers only for transport mode */ 304105197Ssam if (af == AF_INET) { 305105197Ssam struct sockaddr_in *sin; 306105197Ssam struct ip *ip = mtod(m, struct ip *); 307105197Ssam 308105197Ssam if (saidx->src.sa.sa_len == 0) { 309105197Ssam sin = &saidx->src.sin; 310105197Ssam sin->sin_len = sizeof(*sin); 311105197Ssam sin->sin_family = AF_INET; 312105197Ssam sin->sin_port = IPSEC_PORT_ANY; 313105197Ssam sin->sin_addr = ip->ip_src; 314105197Ssam } 315105197Ssam if (saidx->dst.sa.sa_len == 0) { 316105197Ssam sin = &saidx->dst.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_dst; 321105197Ssam } 322105197Ssam } else { 323105197Ssam struct sockaddr_in6 *sin6; 324105197Ssam struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 325105197Ssam 326105197Ssam if (saidx->src.sin6.sin6_len == 0) { 327105197Ssam sin6 = (struct sockaddr_in6 *)&saidx->src; 328105197Ssam sin6->sin6_len = sizeof(*sin6); 329105197Ssam sin6->sin6_family = AF_INET6; 330105197Ssam sin6->sin6_port = IPSEC_PORT_ANY; 331105197Ssam sin6->sin6_addr = ip6->ip6_src; 332105197Ssam if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 333105197Ssam /* fix scope id for comparing SPD */ 334105197Ssam sin6->sin6_addr.s6_addr16[1] = 0; 335105197Ssam sin6->sin6_scope_id = 336105197Ssam ntohs(ip6->ip6_src.s6_addr16[1]); 337105197Ssam } 338105197Ssam } 339105197Ssam if (saidx->dst.sin6.sin6_len == 0) { 340105197Ssam sin6 = (struct sockaddr_in6 *)&saidx->dst; 341105197Ssam sin6->sin6_len = sizeof(*sin6); 342105197Ssam sin6->sin6_family = AF_INET6; 343105197Ssam sin6->sin6_port = IPSEC_PORT_ANY; 344105197Ssam sin6->sin6_addr = ip6->ip6_dst; 345105197Ssam if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 346105197Ssam /* fix scope id for comparing SPD */ 347105197Ssam sin6->sin6_addr.s6_addr16[1] = 0; 348105197Ssam sin6->sin6_scope_id = 349105197Ssam ntohs(ip6->ip6_dst.s6_addr16[1]); 350105197Ssam } 351105197Ssam } 352105197Ssam } 353105197Ssam } 354105197Ssam 355105197Ssam /* 356105197Ssam * Lookup SA and validate it. 357105197Ssam */ 358105197Ssam *error = key_checkrequest(isr, saidx); 359105197Ssam if (*error != 0) { 360105197Ssam /* 361105197Ssam * IPsec processing is required, but no SA found. 362105197Ssam * I assume that key_acquire() had been called 363105197Ssam * to get/establish the SA. Here I discard 364105197Ssam * this packet because it is responsibility for 365105197Ssam * upper layer to retransmit the packet. 366105197Ssam */ 367252692Sae IPSECSTAT_INC(ips_out_nosa); 368105197Ssam goto bad; 369105197Ssam } 370105197Ssam sav = isr->sav; 371177175Sbz if (sav == NULL) { 372120585Ssam IPSEC_ASSERT(ipsec_get_reqlevel(isr) == IPSEC_LEVEL_USE, 373120585Ssam ("no SA found, but required; level %u", 374105197Ssam ipsec_get_reqlevel(isr))); 375120585Ssam IPSECREQUEST_UNLOCK(isr); 376105197Ssam isr = isr->next; 377177175Sbz /* 378177175Sbz * If isr is NULL, we found a 'use' policy w/o SA. 379177175Sbz * Return w/o error and w/o isr so we can drop out 380177175Sbz * and continue w/o IPsec processing. 381177175Sbz */ 382177175Sbz if (isr == NULL) 383105197Ssam return isr; 384120585Ssam IPSECREQUEST_LOCK(isr); 385105197Ssam goto again; 386105197Ssam } 387105197Ssam 388105197Ssam /* 389105197Ssam * Check system global policy controls. 390105197Ssam */ 391181803Sbz if ((isr->saidx.proto == IPPROTO_ESP && !V_esp_enable) || 392181803Sbz (isr->saidx.proto == IPPROTO_AH && !V_ah_enable) || 393181803Sbz (isr->saidx.proto == IPPROTO_IPCOMP && !V_ipcomp_enable)) { 394120585Ssam DPRINTF(("%s: IPsec outbound packet dropped due" 395120585Ssam " to policy (check your sysctls)\n", __func__)); 396252693Sae IPSEC_OSTAT(pdrops); 397105197Ssam *error = EHOSTUNREACH; 398105197Ssam goto bad; 399105197Ssam } 400105197Ssam 401105197Ssam /* 402105197Ssam * Sanity check the SA contents for the caller 403105197Ssam * before they invoke the xform output method. 404105197Ssam */ 405105197Ssam if (sav->tdb_xform == NULL) { 406120585Ssam DPRINTF(("%s: no transform for SA\n", __func__)); 407252693Sae IPSEC_OSTAT(noxform); 408105197Ssam *error = EHOSTUNREACH; 409105197Ssam goto bad; 410105197Ssam } 411105197Ssam return isr; 412105197Ssambad: 413120585Ssam IPSEC_ASSERT(*error != 0, ("error return w/ no error code")); 414120585Ssam IPSECREQUEST_UNLOCK(isr); 415105197Ssam return NULL; 416105197Ssam#undef IPSEC_OSTAT 417105197Ssam} 418105197Ssam 419105197Ssam#ifdef INET 420105197Ssam/* 421105197Ssam * IPsec output logic for IPv4. 422105197Ssam */ 423105197Ssamint 424105197Ssamipsec4_process_packet( 425105197Ssam struct mbuf *m, 426105197Ssam struct ipsecrequest *isr, 427105197Ssam int flags, 428105197Ssam int tunalready) 429105197Ssam{ 430105197Ssam struct secasindex saidx; 431105197Ssam struct secasvar *sav; 432105197Ssam struct ip *ip; 433119643Ssam int error, i, off; 434105197Ssam 435120585Ssam IPSEC_ASSERT(m != NULL, ("null mbuf")); 436120585Ssam IPSEC_ASSERT(isr != NULL, ("null isr")); 437105197Ssam 438120585Ssam IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */ 439105197Ssam 440105197Ssam isr = ipsec_nextisr(m, isr, AF_INET, &saidx, &error); 441177175Sbz if (isr == NULL) { 442177175Sbz if (error != 0) 443177175Sbz goto bad; 444177175Sbz return EJUSTRETURN; 445177175Sbz } 446105197Ssam 447105197Ssam sav = isr->sav; 448159965Sthompsa 449159965Sthompsa#ifdef DEV_ENC 450181627Svanhu encif->if_opackets++; 451181627Svanhu encif->if_obytes += m->m_pkthdr.len; 452181627Svanhu 453174054Sbz /* pass the mbuf to enc0 for bpf processing */ 454174054Sbz ipsec_bpf(m, sav, AF_INET, ENC_OUT|ENC_BEFORE); 455159965Sthompsa /* pass the mbuf to enc0 for packet filtering */ 456174054Sbz if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_BEFORE)) != 0) 457159965Sthompsa goto bad; 458159965Sthompsa#endif 459159965Sthompsa 460105197Ssam if (!tunalready) { 461105197Ssam union sockaddr_union *dst = &sav->sah->saidx.dst; 462105197Ssam int setdf; 463105197Ssam 464105197Ssam /* 465105197Ssam * Collect IP_DF state from the outer header. 466105197Ssam */ 467105197Ssam if (dst->sa.sa_family == AF_INET) { 468105197Ssam if (m->m_len < sizeof (struct ip) && 469105197Ssam (m = m_pullup(m, sizeof (struct ip))) == NULL) { 470105197Ssam error = ENOBUFS; 471105197Ssam goto bad; 472105197Ssam } 473105197Ssam ip = mtod(m, struct ip *); 474105197Ssam /* Honor system-wide control of how to handle IP_DF */ 475181803Sbz switch (V_ip4_ipsec_dfbit) { 476105197Ssam case 0: /* clear in outer header */ 477105197Ssam case 1: /* set in outer header */ 478181803Sbz setdf = V_ip4_ipsec_dfbit; 479105197Ssam break; 480105197Ssam default: /* propagate to outer header */ 481105197Ssam setdf = ntohs(ip->ip_off & IP_DF); 482105197Ssam break; 483105197Ssam } 484105197Ssam } else { 485105197Ssam ip = NULL; /* keep compiler happy */ 486105197Ssam setdf = 0; 487105197Ssam } 488105197Ssam /* Do the appropriate encapsulation, if necessary */ 489105197Ssam if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */ 490105197Ssam dst->sa.sa_family != AF_INET || /* PF mismatch */ 491105197Ssam#if 0 492105197Ssam (sav->flags & SADB_X_SAFLAGS_TUNNEL) || /* Tunnel requ'd */ 493105197Ssam sav->tdb_xform->xf_type == XF_IP4 || /* ditto */ 494105197Ssam#endif 495105197Ssam (dst->sa.sa_family == AF_INET && /* Proxy */ 496105197Ssam dst->sin.sin_addr.s_addr != INADDR_ANY && 497105197Ssam dst->sin.sin_addr.s_addr != ip->ip_dst.s_addr)) { 498105197Ssam struct mbuf *mp; 499105197Ssam 500105197Ssam /* Fix IPv4 header checksum and length */ 501105197Ssam if (m->m_len < sizeof (struct ip) && 502105197Ssam (m = m_pullup(m, sizeof (struct ip))) == NULL) { 503105197Ssam error = ENOBUFS; 504105197Ssam goto bad; 505105197Ssam } 506105197Ssam ip = mtod(m, struct ip *); 507105197Ssam ip->ip_len = htons(m->m_pkthdr.len); 508105197Ssam ip->ip_sum = 0; 509105197Ssam ip->ip_sum = in_cksum(m, ip->ip_hl << 2); 510105197Ssam 511105197Ssam /* Encapsulate the packet */ 512105197Ssam error = ipip_output(m, isr, &mp, 0, 0); 513105197Ssam if (mp == NULL && !error) { 514105197Ssam /* Should never happen. */ 515120585Ssam DPRINTF(("%s: ipip_output returns no mbuf and " 516120585Ssam "no error!", __func__)); 517105197Ssam error = EFAULT; 518105197Ssam } 519105197Ssam if (error) { 520124765Ssam if (mp) { 521124765Ssam /* XXX: Should never happen! */ 522105197Ssam m_freem(mp); 523124765Ssam } 524124765Ssam m = NULL; /* ipip_output() already freed it */ 525105197Ssam goto bad; 526105197Ssam } 527105197Ssam m = mp, mp = NULL; 528105197Ssam /* 529105197Ssam * ipip_output clears IP_DF in the new header. If 530105197Ssam * we need to propagate IP_DF from the outer header, 531105197Ssam * then we have to do it here. 532105197Ssam * 533105197Ssam * XXX shouldn't assume what ipip_output does. 534105197Ssam */ 535105197Ssam if (dst->sa.sa_family == AF_INET && setdf) { 536105197Ssam if (m->m_len < sizeof (struct ip) && 537105197Ssam (m = m_pullup(m, sizeof (struct ip))) == NULL) { 538105197Ssam error = ENOBUFS; 539105197Ssam goto bad; 540105197Ssam } 541105197Ssam ip = mtod(m, struct ip *); 542105197Ssam ip->ip_off = ntohs(ip->ip_off); 543105197Ssam ip->ip_off |= IP_DF; 544105197Ssam ip->ip_off = htons(ip->ip_off); 545105197Ssam } 546105197Ssam } 547105197Ssam } 548105197Ssam 549159965Sthompsa#ifdef DEV_ENC 550159965Sthompsa /* pass the mbuf to enc0 for bpf processing */ 551174054Sbz ipsec_bpf(m, sav, AF_INET, ENC_OUT|ENC_AFTER); 552174054Sbz /* pass the mbuf to enc0 for packet filtering */ 553174054Sbz if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_AFTER)) != 0) 554174054Sbz goto bad; 555159965Sthompsa#endif 556159965Sthompsa 557105197Ssam /* 558105197Ssam * Dispatch to the appropriate IPsec transform logic. The 559105197Ssam * packet will be returned for transmission after crypto 560105197Ssam * processing, etc. are completed. For encapsulation we 561105197Ssam * bypass this call because of the explicit call done above 562105197Ssam * (necessary to deal with IP_DF handling for IPv4). 563105197Ssam * 564105197Ssam * NB: m & sav are ``passed to caller'' who's reponsible for 565105197Ssam * for reclaiming their resources. 566105197Ssam */ 567105197Ssam if (sav->tdb_xform->xf_type != XF_IP4) { 568105197Ssam ip = mtod(m, struct ip *); 569105197Ssam i = ip->ip_hl << 2; 570105197Ssam off = offsetof(struct ip, ip_p); 571105197Ssam error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off); 572105197Ssam } else { 573105197Ssam error = ipsec_process_done(m, isr); 574105197Ssam } 575120585Ssam IPSECREQUEST_UNLOCK(isr); 576105197Ssam return error; 577105197Ssambad: 578120585Ssam if (isr) 579120585Ssam IPSECREQUEST_UNLOCK(isr); 580105197Ssam if (m) 581105197Ssam m_freem(m); 582105197Ssam return error; 583105197Ssam} 584105197Ssam#endif 585105197Ssam 586105197Ssam#ifdef INET6 587105197Ssam/* 588105197Ssam * Chop IP6 header from the payload. 589105197Ssam */ 590105197Ssamstatic struct mbuf * 591105197Ssamipsec6_splithdr(struct mbuf *m) 592105197Ssam{ 593105197Ssam struct mbuf *mh; 594105197Ssam struct ip6_hdr *ip6; 595105197Ssam int hlen; 596105197Ssam 597120585Ssam IPSEC_ASSERT(m->m_len >= sizeof (struct ip6_hdr), 598120585Ssam ("first mbuf too short, len %u", m->m_len)); 599105197Ssam ip6 = mtod(m, struct ip6_hdr *); 600105197Ssam hlen = sizeof(struct ip6_hdr); 601105197Ssam if (m->m_len > hlen) { 602151967Sandre MGETHDR(mh, M_DONTWAIT, MT_DATA); 603105197Ssam if (!mh) { 604105197Ssam m_freem(m); 605105197Ssam return NULL; 606105197Ssam } 607108466Ssam M_MOVE_PKTHDR(mh, m); 608105197Ssam MH_ALIGN(mh, hlen); 609105197Ssam m->m_len -= hlen; 610105197Ssam m->m_data += hlen; 611105197Ssam mh->m_next = m; 612105197Ssam m = mh; 613105197Ssam m->m_len = hlen; 614105197Ssam bcopy((caddr_t)ip6, mtod(m, caddr_t), hlen); 615105197Ssam } else if (m->m_len < hlen) { 616105197Ssam m = m_pullup(m, hlen); 617105197Ssam if (!m) 618105197Ssam return NULL; 619105197Ssam } 620105197Ssam return m; 621105197Ssam} 622105197Ssam 623105197Ssam/* 624105197Ssam * IPsec output logic for IPv6, transport mode. 625105197Ssam */ 626105197Ssamint 627105197Ssamipsec6_output_trans( 628105197Ssam struct ipsec_output_state *state, 629105197Ssam u_char *nexthdrp, 630105197Ssam struct mbuf *mprev, 631105197Ssam struct secpolicy *sp, 632105197Ssam int flags, 633105197Ssam int *tun) 634105197Ssam{ 635105197Ssam struct ipsecrequest *isr; 636105197Ssam struct secasindex saidx; 637105197Ssam int error = 0; 638105197Ssam struct mbuf *m; 639105197Ssam 640120585Ssam IPSEC_ASSERT(state != NULL, ("null state")); 641120585Ssam IPSEC_ASSERT(state->m != NULL, ("null m")); 642120585Ssam IPSEC_ASSERT(nexthdrp != NULL, ("null nexthdrp")); 643120585Ssam IPSEC_ASSERT(mprev != NULL, ("null mprev")); 644120585Ssam IPSEC_ASSERT(sp != NULL, ("null sp")); 645120585Ssam IPSEC_ASSERT(tun != NULL, ("null tun")); 646105197Ssam 647105197Ssam KEYDEBUG(KEYDEBUG_IPSEC_DATA, 648170122Sbz printf("%s: applied SP\n", __func__); 649105197Ssam kdebug_secpolicy(sp)); 650105197Ssam 651105197Ssam isr = sp->req; 652105197Ssam if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 653105197Ssam /* the rest will be handled by ipsec6_output_tunnel() */ 654105197Ssam *tun = 1; /* need tunnel-mode processing */ 655105197Ssam return 0; 656105197Ssam } 657105197Ssam 658105197Ssam *tun = 0; 659105197Ssam m = state->m; 660105197Ssam 661171133Sgnn IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */ 662105197Ssam isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error); 663105197Ssam if (isr == NULL) { 664177175Sbz if (error != 0) { 665105197Ssam#ifdef notdef 666177175Sbz /* XXX should notification be done for all errors ? */ 667177175Sbz /* 668177175Sbz * Notify the fact that the packet is discarded 669177175Sbz * to ourselves. I believe this is better than 670177175Sbz * just silently discarding. (jinmei@kame.net) 671177175Sbz * XXX: should we restrict the error to TCP packets? 672177175Sbz * XXX: should we directly notify sockets via 673177175Sbz * pfctlinputs? 674177175Sbz */ 675177175Sbz icmp6_error(m, ICMP6_DST_UNREACH, 676177175Sbz ICMP6_DST_UNREACH_ADMIN, 0); 677177175Sbz m = NULL; /* NB: icmp6_error frees mbuf */ 678105197Ssam#endif 679177175Sbz goto bad; 680177175Sbz } 681177175Sbz return EJUSTRETURN; 682105197Ssam } 683105197Ssam 684171133Sgnn error = (*isr->sav->tdb_xform->xf_output)(m, isr, NULL, 685171133Sgnn sizeof (struct ip6_hdr), 686171133Sgnn offsetof(struct ip6_hdr, 687171133Sgnn ip6_nxt)); 688171133Sgnn IPSECREQUEST_UNLOCK(isr); 689171133Sgnn return error; 690105197Ssambad: 691171133Sgnn if (isr) 692171133Sgnn IPSECREQUEST_UNLOCK(isr); 693105197Ssam if (m) 694105197Ssam m_freem(m); 695105197Ssam state->m = NULL; 696105197Ssam return error; 697105197Ssam} 698105197Ssam 699105197Ssamstatic int 700105197Ssamipsec6_encapsulate(struct mbuf *m, struct secasvar *sav) 701105197Ssam{ 702105197Ssam struct ip6_hdr *oip6; 703105197Ssam struct ip6_hdr *ip6; 704105197Ssam size_t plen; 705105197Ssam 706105197Ssam /* can't tunnel between different AFs */ 707105197Ssam if (sav->sah->saidx.src.sa.sa_family != AF_INET6 || 708105197Ssam sav->sah->saidx.dst.sa.sa_family != AF_INET6) { 709105197Ssam m_freem(m); 710105197Ssam return EINVAL; 711105197Ssam } 712171133Sgnn IPSEC_ASSERT(m->m_len == sizeof (struct ip6_hdr), 713120585Ssam ("mbuf wrong size; len %u", m->m_len)); 714105197Ssam 715105197Ssam 716105197Ssam /* 717105197Ssam * grow the mbuf to accomodate the new IPv6 header. 718105197Ssam */ 719105197Ssam plen = m->m_pkthdr.len; 720105197Ssam if (M_LEADINGSPACE(m->m_next) < sizeof(struct ip6_hdr)) { 721105197Ssam struct mbuf *n; 722111119Simp MGET(n, M_DONTWAIT, MT_DATA); 723105197Ssam if (!n) { 724105197Ssam m_freem(m); 725105197Ssam return ENOBUFS; 726105197Ssam } 727105197Ssam n->m_len = sizeof(struct ip6_hdr); 728105197Ssam n->m_next = m->m_next; 729105197Ssam m->m_next = n; 730105197Ssam m->m_pkthdr.len += sizeof(struct ip6_hdr); 731105197Ssam oip6 = mtod(n, struct ip6_hdr *); 732105197Ssam } else { 733105197Ssam m->m_next->m_len += sizeof(struct ip6_hdr); 734105197Ssam m->m_next->m_data -= sizeof(struct ip6_hdr); 735105197Ssam m->m_pkthdr.len += sizeof(struct ip6_hdr); 736105197Ssam oip6 = mtod(m->m_next, struct ip6_hdr *); 737105197Ssam } 738105197Ssam ip6 = mtod(m, struct ip6_hdr *); 739113076Sdes bcopy((caddr_t)ip6, (caddr_t)oip6, sizeof(struct ip6_hdr)); 740105197Ssam 741105197Ssam /* Fake link-local scope-class addresses */ 742105197Ssam if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src)) 743105197Ssam oip6->ip6_src.s6_addr16[1] = 0; 744105197Ssam if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst)) 745105197Ssam oip6->ip6_dst.s6_addr16[1] = 0; 746105197Ssam 747105197Ssam /* construct new IPv6 header. see RFC 2401 5.1.2.2 */ 748105197Ssam /* ECN consideration. */ 749181803Sbz ip6_ecn_ingress(V_ip6_ipsec_ecn, &ip6->ip6_flow, &oip6->ip6_flow); 750105197Ssam if (plen < IPV6_MAXPACKET - sizeof(struct ip6_hdr)) 751105197Ssam ip6->ip6_plen = htons(plen); 752105197Ssam else { 753105197Ssam /* ip6->ip6_plen will be updated in ip6_output() */ 754105197Ssam } 755105197Ssam ip6->ip6_nxt = IPPROTO_IPV6; 756171133Sgnn ip6->ip6_src = sav->sah->saidx.src.sin6.sin6_addr; 757171133Sgnn ip6->ip6_dst = sav->sah->saidx.dst.sin6.sin6_addr; 758105197Ssam ip6->ip6_hlim = IPV6_DEFHLIM; 759105197Ssam 760105197Ssam /* XXX Should ip6_src be updated later ? */ 761105197Ssam 762105197Ssam return 0; 763105197Ssam} 764105197Ssam 765105197Ssam/* 766105197Ssam * IPsec output logic for IPv6, tunnel mode. 767105197Ssam */ 768105197Ssamint 769105197Ssamipsec6_output_tunnel(struct ipsec_output_state *state, struct secpolicy *sp, int flags) 770105197Ssam{ 771105197Ssam struct ip6_hdr *ip6; 772105197Ssam struct ipsecrequest *isr; 773105197Ssam struct secasindex saidx; 774105197Ssam int error; 775213836Sbz struct sockaddr_in6 *dst6; 776105197Ssam struct mbuf *m; 777105197Ssam 778120585Ssam IPSEC_ASSERT(state != NULL, ("null state")); 779120585Ssam IPSEC_ASSERT(state->m != NULL, ("null m")); 780120585Ssam IPSEC_ASSERT(sp != NULL, ("null sp")); 781105197Ssam 782105197Ssam KEYDEBUG(KEYDEBUG_IPSEC_DATA, 783170122Sbz printf("%s: applied SP\n", __func__); 784105197Ssam kdebug_secpolicy(sp)); 785105197Ssam 786105197Ssam m = state->m; 787105197Ssam /* 788105197Ssam * transport mode ipsec (before the 1st tunnel mode) is already 789105197Ssam * processed by ipsec6_output_trans(). 790105197Ssam */ 791105197Ssam for (isr = sp->req; isr; isr = isr->next) { 792105197Ssam if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 793105197Ssam break; 794105197Ssam } 795170123Sbz 796170123Sbz IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */ 797105197Ssam isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error); 798177175Sbz if (isr == NULL) { 799177175Sbz if (error != 0) 800177175Sbz goto bad; 801177175Sbz return EJUSTRETURN; 802177175Sbz } 803105197Ssam 804174054Sbz#ifdef DEV_ENC 805181627Svanhu encif->if_opackets++; 806181627Svanhu encif->if_obytes += m->m_pkthdr.len; 807181627Svanhu 808174054Sbz /* pass the mbuf to enc0 for bpf processing */ 809174054Sbz ipsec_bpf(m, isr->sav, AF_INET6, ENC_OUT|ENC_BEFORE); 810174054Sbz /* pass the mbuf to enc0 for packet filtering */ 811174054Sbz if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_BEFORE)) != 0) 812174054Sbz goto bad; 813174054Sbz#endif 814174054Sbz 815105197Ssam /* 816105197Ssam * There may be the case that SA status will be changed when 817105197Ssam * we are refering to one. So calling splsoftnet(). 818105197Ssam */ 819105197Ssam if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 820105197Ssam /* 821105197Ssam * build IPsec tunnel. 822105197Ssam */ 823105197Ssam /* XXX should be processed with other familiy */ 824105197Ssam if (isr->sav->sah->saidx.src.sa.sa_family != AF_INET6) { 825120585Ssam ipseclog((LOG_ERR, "%s: family mismatched between " 826120585Ssam "inner and outer, spi=%u\n", __func__, 827105197Ssam ntohl(isr->sav->spi))); 828252692Sae IPSEC6STAT_INC(ips_out_inval); 829105197Ssam error = EAFNOSUPPORT; 830105197Ssam goto bad; 831105197Ssam } 832105197Ssam 833105197Ssam m = ipsec6_splithdr(m); 834105197Ssam if (!m) { 835252692Sae IPSEC6STAT_INC(ips_out_nomem); 836105197Ssam error = ENOMEM; 837105197Ssam goto bad; 838105197Ssam } 839105197Ssam error = ipsec6_encapsulate(m, isr->sav); 840105197Ssam if (error) { 841105197Ssam m = NULL; 842105197Ssam goto bad; 843105197Ssam } 844105197Ssam ip6 = mtod(m, struct ip6_hdr *); 845105197Ssam 846214250Sbz state->ro = 847214250Sbz (struct route *)&isr->sav->sah->route_cache.sin6_route; 848105197Ssam state->dst = (struct sockaddr *)&state->ro->ro_dst; 849105197Ssam dst6 = (struct sockaddr_in6 *)state->dst; 850105197Ssam if (state->ro->ro_rt 851105197Ssam && ((state->ro->ro_rt->rt_flags & RTF_UP) == 0 852105197Ssam || !IN6_ARE_ADDR_EQUAL(&dst6->sin6_addr, &ip6->ip6_dst))) { 853105197Ssam RTFREE(state->ro->ro_rt); 854105197Ssam state->ro->ro_rt = NULL; 855105197Ssam } 856187936Sbz if (state->ro->ro_rt == NULL) { 857105197Ssam bzero(dst6, sizeof(*dst6)); 858105197Ssam dst6->sin6_family = AF_INET6; 859105197Ssam dst6->sin6_len = sizeof(*dst6); 860105197Ssam dst6->sin6_addr = ip6->ip6_dst; 861232292Sbz rtalloc_ign_fib(state->ro, 0UL, M_GETFIB(m)); 862105197Ssam } 863187936Sbz if (state->ro->ro_rt == NULL) { 864250044Sae IP6STAT_INC(ip6s_noroute); 865252692Sae IPSEC6STAT_INC(ips_out_noroute); 866105197Ssam error = EHOSTUNREACH; 867105197Ssam goto bad; 868105197Ssam } 869105197Ssam 870105197Ssam /* adjust state->dst if tunnel endpoint is offlink */ 871213837Sbz if (state->ro->ro_rt->rt_flags & RTF_GATEWAY) 872105197Ssam state->dst = (struct sockaddr *)state->ro->ro_rt->rt_gateway; 873105197Ssam } 874105197Ssam 875105197Ssam m = ipsec6_splithdr(m); 876105197Ssam if (!m) { 877252692Sae IPSEC6STAT_INC(ips_out_nomem); 878105197Ssam error = ENOMEM; 879105197Ssam goto bad; 880105197Ssam } 881105197Ssam ip6 = mtod(m, struct ip6_hdr *); 882174054Sbz 883174054Sbz#ifdef DEV_ENC 884174054Sbz /* pass the mbuf to enc0 for bpf processing */ 885174054Sbz ipsec_bpf(m, isr->sav, AF_INET6, ENC_OUT|ENC_AFTER); 886174054Sbz /* pass the mbuf to enc0 for packet filtering */ 887174054Sbz if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_AFTER)) != 0) 888174054Sbz goto bad; 889174054Sbz#endif 890174054Sbz 891170123Sbz error = (*isr->sav->tdb_xform->xf_output)(m, isr, NULL, 892105197Ssam sizeof (struct ip6_hdr), 893105197Ssam offsetof(struct ip6_hdr, ip6_nxt)); 894170123Sbz IPSECREQUEST_UNLOCK(isr); 895170123Sbz return error; 896105197Ssambad: 897170123Sbz if (isr) 898170123Sbz IPSECREQUEST_UNLOCK(isr); 899105197Ssam if (m) 900105197Ssam m_freem(m); 901105197Ssam state->m = NULL; 902105197Ssam return error; 903105197Ssam} 904105197Ssam#endif /*INET6*/ 905