ipsec_output.c revision 221129
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 221129 2011-04-27 19:28:42Z bz $ 27112758Ssam */ 28105197Ssam 29105197Ssam/* 30105197Ssam * IPsec output processing. 31105197Ssam */ 32105197Ssam#include "opt_inet.h" 33105197Ssam#include "opt_inet6.h" 34105197Ssam#include "opt_ipsec.h" 35159965Sthompsa#include "opt_enc.h" 36105197Ssam 37105197Ssam#include <sys/param.h> 38105197Ssam#include <sys/systm.h> 39105197Ssam#include <sys/mbuf.h> 40105197Ssam#include <sys/domain.h> 41105197Ssam#include <sys/protosw.h> 42105197Ssam#include <sys/socket.h> 43105197Ssam#include <sys/errno.h> 44105197Ssam#include <sys/syslog.h> 45105197Ssam 46105197Ssam#include <net/if.h> 47171497Sbz#include <net/pfil.h> 48105197Ssam#include <net/route.h> 49195699Srwatson#include <net/vnet.h> 50105197Ssam 51105197Ssam#include <netinet/in.h> 52105197Ssam#include <netinet/in_systm.h> 53105197Ssam#include <netinet/ip.h> 54105197Ssam#include <netinet/ip_var.h> 55105197Ssam#include <netinet/in_var.h> 56105197Ssam#include <netinet/ip_ecn.h> 57105197Ssam#ifdef INET6 58105197Ssam#include <netinet6/ip6_ecn.h> 59105197Ssam#endif 60105197Ssam 61105197Ssam#include <netinet/ip6.h> 62105197Ssam#ifdef INET6 63105197Ssam#include <netinet6/ip6_var.h> 64105197Ssam#endif 65105197Ssam#include <netinet/in_pcb.h> 66105197Ssam#ifdef INET6 67105197Ssam#include <netinet/icmp6.h> 68105197Ssam#endif 69105197Ssam 70105197Ssam#include <netipsec/ipsec.h> 71105197Ssam#ifdef INET6 72105197Ssam#include <netipsec/ipsec6.h> 73105197Ssam#endif 74105197Ssam#include <netipsec/ah_var.h> 75105197Ssam#include <netipsec/esp_var.h> 76105197Ssam#include <netipsec/ipcomp_var.h> 77105197Ssam 78105197Ssam#include <netipsec/xform.h> 79105197Ssam 80105197Ssam#include <netipsec/key.h> 81105197Ssam#include <netipsec/keydb.h> 82105197Ssam#include <netipsec/key_debug.h> 83105197Ssam 84105197Ssam#include <machine/in_cksum.h> 85105197Ssam 86194062Svanhu#ifdef IPSEC_NAT_T 87194062Svanhu#include <netinet/udp.h> 88194062Svanhu#endif 89194062Svanhu 90181627Svanhu#ifdef DEV_ENC 91181627Svanhu#include <net/if_enc.h> 92181627Svanhu#endif 93181627Svanhu 94181627Svanhu 95105197Ssamint 96105197Ssamipsec_process_done(struct mbuf *m, struct ipsecrequest *isr) 97105197Ssam{ 98105197Ssam struct tdb_ident *tdbi; 99105197Ssam struct m_tag *mtag; 100105197Ssam struct secasvar *sav; 101105197Ssam struct secasindex *saidx; 102105197Ssam int error; 103105197Ssam 104120585Ssam IPSEC_ASSERT(m != NULL, ("null mbuf")); 105120585Ssam IPSEC_ASSERT(isr != NULL, ("null ISR")); 106105197Ssam sav = isr->sav; 107120585Ssam IPSEC_ASSERT(sav != NULL, ("null SA")); 108120585Ssam IPSEC_ASSERT(sav->sah != NULL, ("null SAH")); 109105197Ssam 110105197Ssam saidx = &sav->sah->saidx; 111105197Ssam switch (saidx->dst.sa.sa_family) { 112105197Ssam#ifdef INET 113105197Ssam case AF_INET: 114105197Ssam /* Fix the header length, for AH processing. */ 115105197Ssam mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len); 116105197Ssam break; 117105197Ssam#endif /* INET */ 118105197Ssam#ifdef INET6 119105197Ssam case AF_INET6: 120105197Ssam /* Fix the header length, for AH processing. */ 121105197Ssam if (m->m_pkthdr.len < sizeof (struct ip6_hdr)) { 122105197Ssam error = ENXIO; 123105197Ssam goto bad; 124105197Ssam } 125105197Ssam if (m->m_pkthdr.len - sizeof (struct ip6_hdr) > IPV6_MAXPACKET) { 126105197Ssam /* No jumbogram support. */ 127105197Ssam error = ENXIO; /*?*/ 128105197Ssam goto bad; 129105197Ssam } 130105197Ssam mtod(m, struct ip6_hdr *)->ip6_plen = 131105197Ssam htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 132105197Ssam break; 133105197Ssam#endif /* INET6 */ 134105197Ssam default: 135120585Ssam DPRINTF(("%s: unknown protocol family %u\n", __func__, 136105197Ssam saidx->dst.sa.sa_family)); 137105197Ssam error = ENXIO; 138105197Ssam goto bad; 139105197Ssam } 140105197Ssam 141105197Ssam /* 142105197Ssam * Add a record of what we've done or what needs to be done to the 143105197Ssam * packet. 144105197Ssam */ 145105197Ssam mtag = m_tag_get(PACKET_TAG_IPSEC_OUT_DONE, 146105197Ssam sizeof(struct tdb_ident), M_NOWAIT); 147105197Ssam if (mtag == NULL) { 148120585Ssam DPRINTF(("%s: could not get packet tag\n", __func__)); 149105197Ssam error = ENOMEM; 150105197Ssam goto bad; 151105197Ssam } 152105197Ssam 153105197Ssam tdbi = (struct tdb_ident *)(mtag + 1); 154105197Ssam tdbi->dst = saidx->dst; 155105197Ssam tdbi->proto = saidx->proto; 156105197Ssam tdbi->spi = sav->spi; 157105197Ssam m_tag_prepend(m, mtag); 158105197Ssam 159105197Ssam /* 160105197Ssam * If there's another (bundled) SA to apply, do so. 161105197Ssam * Note that this puts a burden on the kernel stack size. 162105197Ssam * If this is a problem we'll need to introduce a queue 163105197Ssam * to set the packet on so we can unwind the stack before 164105197Ssam * doing further processing. 165105197Ssam */ 166105197Ssam if (isr->next) { 167181803Sbz V_ipsec4stat.ips_out_bundlesa++; 168221129Sbz sav = isr->next->sav; 169221129Sbz saidx = &sav->sah->saidx; 170221129Sbz switch (saidx->dst.sa.sa_family) { 171221129Sbz#ifdef INET 172221129Sbz case AF_INET: 173221129Sbz return ipsec4_process_packet(m, isr->next, 0, 0); 174221129Sbz /* NOTREACHED */ 175221129Sbz#endif 176221129Sbz#ifdef notyet 177221129Sbz#ifdef INET6 178221129Sbz case AF_INET6: 179221129Sbz /* XXX */ 180221129Sbz ipsec6_output_trans() 181221129Sbz ipsec6_output_tunnel() 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 struct ip *ip; 202105197Ssam case AF_INET: 203105197Ssam ip = mtod(m, struct ip *); 204105197Ssam ip->ip_len = ntohs(ip->ip_len); 205105197Ssam ip->ip_off = ntohs(ip->ip_off); 206105197Ssam 207194062Svanhu#ifdef IPSEC_NAT_T 208194062Svanhu /* 209194062Svanhu * If NAT-T is enabled, now that all IPsec processing is done 210194062Svanhu * insert UDP encapsulation header after IP header. 211194062Svanhu */ 212194062Svanhu if (sav->natt_type) { 213194062Svanhu#ifdef _IP_VHL 214194062Svanhu const int hlen = IP_VHL_HL(ip->ip_vhl); 215194062Svanhu#else 216194062Svanhu const int hlen = (ip->ip_hl << 2); 217194062Svanhu#endif 218194062Svanhu int size, off; 219194062Svanhu struct mbuf *mi; 220194062Svanhu struct udphdr *udp; 221194062Svanhu 222194062Svanhu size = sizeof(struct udphdr); 223194062Svanhu if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) { 224194062Svanhu /* 225194062Svanhu * draft-ietf-ipsec-nat-t-ike-0[01].txt and 226194062Svanhu * draft-ietf-ipsec-udp-encaps-(00/)01.txt, 227194062Svanhu * ignoring possible AH mode 228194062Svanhu * non-IKE marker + non-ESP marker 229194062Svanhu * from draft-ietf-ipsec-udp-encaps-00.txt. 230194062Svanhu */ 231194062Svanhu size += sizeof(u_int64_t); 232194062Svanhu } 233194062Svanhu mi = m_makespace(m, hlen, size, &off); 234194062Svanhu if (mi == NULL) { 235194062Svanhu DPRINTF(("%s: m_makespace for udphdr failed\n", 236194062Svanhu __func__)); 237194062Svanhu error = ENOBUFS; 238194062Svanhu goto bad; 239194062Svanhu } 240194062Svanhu 241194062Svanhu udp = (struct udphdr *)(mtod(mi, caddr_t) + off); 242194062Svanhu if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) 243194062Svanhu udp->uh_sport = htons(UDP_ENCAP_ESPINUDP_PORT); 244194062Svanhu else 245194062Svanhu udp->uh_sport = 246194062Svanhu KEY_PORTFROMSADDR(&sav->sah->saidx.src); 247194062Svanhu udp->uh_dport = KEY_PORTFROMSADDR(&sav->sah->saidx.dst); 248194062Svanhu udp->uh_sum = 0; 249194062Svanhu udp->uh_ulen = htons(m->m_pkthdr.len - hlen); 250194062Svanhu ip->ip_len = m->m_pkthdr.len; 251194062Svanhu ip->ip_p = IPPROTO_UDP; 252194062Svanhu 253194062Svanhu if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) 254194062Svanhu *(u_int64_t *)(udp + 1) = 0; 255194062Svanhu } 256194062Svanhu#endif /* IPSEC_NAT_T */ 257194062Svanhu 258105197Ssam return ip_output(m, NULL, NULL, IP_RAWOUTPUT, NULL, NULL); 259105197Ssam#endif /* INET */ 260105197Ssam#ifdef INET6 261105197Ssam case AF_INET6: 262105197Ssam /* 263105197Ssam * We don't need massage, IPv6 header fields are always in 264105197Ssam * net endian. 265105197Ssam */ 266105197Ssam return ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL); 267105197Ssam#endif /* INET6 */ 268105197Ssam } 269105197Ssam panic("ipsec_process_done"); 270105197Ssambad: 271105197Ssam m_freem(m); 272105197Ssam return (error); 273105197Ssam} 274105197Ssam 275105197Ssamstatic struct ipsecrequest * 276105197Ssamipsec_nextisr( 277105197Ssam struct mbuf *m, 278105197Ssam struct ipsecrequest *isr, 279105197Ssam int af, 280105197Ssam struct secasindex *saidx, 281105197Ssam int *error 282105197Ssam) 283105197Ssam{ 284105197Ssam#define IPSEC_OSTAT(x,y,z) (isr->saidx.proto == IPPROTO_ESP ? (x)++ : \ 285105197Ssam isr->saidx.proto == IPPROTO_AH ? (y)++ : (z)++) 286105197Ssam struct secasvar *sav; 287105197Ssam 288120585Ssam IPSECREQUEST_LOCK_ASSERT(isr); 289120585Ssam 290120585Ssam IPSEC_ASSERT(af == AF_INET || af == AF_INET6, 291120585Ssam ("invalid address family %u", af)); 292105197Ssamagain: 293105197Ssam /* 294105197Ssam * Craft SA index to search for proper SA. Note that 295105197Ssam * we only fillin unspecified SA peers for transport 296105197Ssam * mode; for tunnel mode they must already be filled in. 297105197Ssam */ 298105197Ssam *saidx = isr->saidx; 299105197Ssam if (isr->saidx.mode == IPSEC_MODE_TRANSPORT) { 300105197Ssam /* Fillin unspecified SA peers only for transport mode */ 301105197Ssam if (af == AF_INET) { 302105197Ssam struct sockaddr_in *sin; 303105197Ssam struct ip *ip = mtod(m, struct ip *); 304105197Ssam 305105197Ssam if (saidx->src.sa.sa_len == 0) { 306105197Ssam sin = &saidx->src.sin; 307105197Ssam sin->sin_len = sizeof(*sin); 308105197Ssam sin->sin_family = AF_INET; 309105197Ssam sin->sin_port = IPSEC_PORT_ANY; 310105197Ssam sin->sin_addr = ip->ip_src; 311105197Ssam } 312105197Ssam if (saidx->dst.sa.sa_len == 0) { 313105197Ssam sin = &saidx->dst.sin; 314105197Ssam sin->sin_len = sizeof(*sin); 315105197Ssam sin->sin_family = AF_INET; 316105197Ssam sin->sin_port = IPSEC_PORT_ANY; 317105197Ssam sin->sin_addr = ip->ip_dst; 318105197Ssam } 319105197Ssam } else { 320105197Ssam struct sockaddr_in6 *sin6; 321105197Ssam struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 322105197Ssam 323105197Ssam if (saidx->src.sin6.sin6_len == 0) { 324105197Ssam sin6 = (struct sockaddr_in6 *)&saidx->src; 325105197Ssam sin6->sin6_len = sizeof(*sin6); 326105197Ssam sin6->sin6_family = AF_INET6; 327105197Ssam sin6->sin6_port = IPSEC_PORT_ANY; 328105197Ssam sin6->sin6_addr = ip6->ip6_src; 329105197Ssam if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 330105197Ssam /* fix scope id for comparing SPD */ 331105197Ssam sin6->sin6_addr.s6_addr16[1] = 0; 332105197Ssam sin6->sin6_scope_id = 333105197Ssam ntohs(ip6->ip6_src.s6_addr16[1]); 334105197Ssam } 335105197Ssam } 336105197Ssam if (saidx->dst.sin6.sin6_len == 0) { 337105197Ssam sin6 = (struct sockaddr_in6 *)&saidx->dst; 338105197Ssam sin6->sin6_len = sizeof(*sin6); 339105197Ssam sin6->sin6_family = AF_INET6; 340105197Ssam sin6->sin6_port = IPSEC_PORT_ANY; 341105197Ssam sin6->sin6_addr = ip6->ip6_dst; 342105197Ssam if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 343105197Ssam /* fix scope id for comparing SPD */ 344105197Ssam sin6->sin6_addr.s6_addr16[1] = 0; 345105197Ssam sin6->sin6_scope_id = 346105197Ssam ntohs(ip6->ip6_dst.s6_addr16[1]); 347105197Ssam } 348105197Ssam } 349105197Ssam } 350105197Ssam } 351105197Ssam 352105197Ssam /* 353105197Ssam * Lookup SA and validate it. 354105197Ssam */ 355105197Ssam *error = key_checkrequest(isr, saidx); 356105197Ssam if (*error != 0) { 357105197Ssam /* 358105197Ssam * IPsec processing is required, but no SA found. 359105197Ssam * I assume that key_acquire() had been called 360105197Ssam * to get/establish the SA. Here I discard 361105197Ssam * this packet because it is responsibility for 362105197Ssam * upper layer to retransmit the packet. 363105197Ssam */ 364181803Sbz V_ipsec4stat.ips_out_nosa++; 365105197Ssam goto bad; 366105197Ssam } 367105197Ssam sav = isr->sav; 368177175Sbz if (sav == NULL) { 369120585Ssam IPSEC_ASSERT(ipsec_get_reqlevel(isr) == IPSEC_LEVEL_USE, 370120585Ssam ("no SA found, but required; level %u", 371105197Ssam ipsec_get_reqlevel(isr))); 372120585Ssam IPSECREQUEST_UNLOCK(isr); 373105197Ssam isr = isr->next; 374177175Sbz /* 375177175Sbz * If isr is NULL, we found a 'use' policy w/o SA. 376177175Sbz * Return w/o error and w/o isr so we can drop out 377177175Sbz * and continue w/o IPsec processing. 378177175Sbz */ 379177175Sbz if (isr == NULL) 380105197Ssam return isr; 381120585Ssam IPSECREQUEST_LOCK(isr); 382105197Ssam goto again; 383105197Ssam } 384105197Ssam 385105197Ssam /* 386105197Ssam * Check system global policy controls. 387105197Ssam */ 388181803Sbz if ((isr->saidx.proto == IPPROTO_ESP && !V_esp_enable) || 389181803Sbz (isr->saidx.proto == IPPROTO_AH && !V_ah_enable) || 390181803Sbz (isr->saidx.proto == IPPROTO_IPCOMP && !V_ipcomp_enable)) { 391120585Ssam DPRINTF(("%s: IPsec outbound packet dropped due" 392120585Ssam " to policy (check your sysctls)\n", __func__)); 393181803Sbz IPSEC_OSTAT(V_espstat.esps_pdrops, V_ahstat.ahs_pdrops, 394181803Sbz V_ipcompstat.ipcomps_pdrops); 395105197Ssam *error = EHOSTUNREACH; 396105197Ssam goto bad; 397105197Ssam } 398105197Ssam 399105197Ssam /* 400105197Ssam * Sanity check the SA contents for the caller 401105197Ssam * before they invoke the xform output method. 402105197Ssam */ 403105197Ssam if (sav->tdb_xform == NULL) { 404120585Ssam DPRINTF(("%s: no transform for SA\n", __func__)); 405181803Sbz IPSEC_OSTAT(V_espstat.esps_noxform, V_ahstat.ahs_noxform, 406181803Sbz V_ipcompstat.ipcomps_noxform); 407105197Ssam *error = EHOSTUNREACH; 408105197Ssam goto bad; 409105197Ssam } 410105197Ssam return isr; 411105197Ssambad: 412120585Ssam IPSEC_ASSERT(*error != 0, ("error return w/ no error code")); 413120585Ssam IPSECREQUEST_UNLOCK(isr); 414105197Ssam return NULL; 415105197Ssam#undef IPSEC_OSTAT 416105197Ssam} 417105197Ssam 418105197Ssam#ifdef INET 419105197Ssam/* 420105197Ssam * IPsec output logic for IPv4. 421105197Ssam */ 422105197Ssamint 423105197Ssamipsec4_process_packet( 424105197Ssam struct mbuf *m, 425105197Ssam struct ipsecrequest *isr, 426105197Ssam int flags, 427105197Ssam int tunalready) 428105197Ssam{ 429105197Ssam struct secasindex saidx; 430105197Ssam struct secasvar *sav; 431105197Ssam struct ip *ip; 432119643Ssam int error, i, off; 433105197Ssam 434120585Ssam IPSEC_ASSERT(m != NULL, ("null mbuf")); 435120585Ssam IPSEC_ASSERT(isr != NULL, ("null isr")); 436105197Ssam 437120585Ssam IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */ 438105197Ssam 439105197Ssam isr = ipsec_nextisr(m, isr, AF_INET, &saidx, &error); 440177175Sbz if (isr == NULL) { 441177175Sbz if (error != 0) 442177175Sbz goto bad; 443177175Sbz return EJUSTRETURN; 444177175Sbz } 445105197Ssam 446105197Ssam sav = isr->sav; 447159965Sthompsa 448159965Sthompsa#ifdef DEV_ENC 449181627Svanhu encif->if_opackets++; 450181627Svanhu encif->if_obytes += m->m_pkthdr.len; 451181627Svanhu 452174054Sbz /* pass the mbuf to enc0 for bpf processing */ 453174054Sbz ipsec_bpf(m, sav, AF_INET, ENC_OUT|ENC_BEFORE); 454159965Sthompsa /* pass the mbuf to enc0 for packet filtering */ 455174054Sbz if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_BEFORE)) != 0) 456159965Sthompsa goto bad; 457159965Sthompsa#endif 458159965Sthompsa 459105197Ssam if (!tunalready) { 460105197Ssam union sockaddr_union *dst = &sav->sah->saidx.dst; 461105197Ssam int setdf; 462105197Ssam 463105197Ssam /* 464105197Ssam * Collect IP_DF state from the outer header. 465105197Ssam */ 466105197Ssam if (dst->sa.sa_family == AF_INET) { 467105197Ssam if (m->m_len < sizeof (struct ip) && 468105197Ssam (m = m_pullup(m, sizeof (struct ip))) == NULL) { 469105197Ssam error = ENOBUFS; 470105197Ssam goto bad; 471105197Ssam } 472105197Ssam ip = mtod(m, struct ip *); 473105197Ssam /* Honor system-wide control of how to handle IP_DF */ 474181803Sbz switch (V_ip4_ipsec_dfbit) { 475105197Ssam case 0: /* clear in outer header */ 476105197Ssam case 1: /* set in outer header */ 477181803Sbz setdf = V_ip4_ipsec_dfbit; 478105197Ssam break; 479105197Ssam default: /* propagate to outer header */ 480105197Ssam setdf = ntohs(ip->ip_off & IP_DF); 481105197Ssam break; 482105197Ssam } 483105197Ssam } else { 484105197Ssam ip = NULL; /* keep compiler happy */ 485105197Ssam setdf = 0; 486105197Ssam } 487105197Ssam /* Do the appropriate encapsulation, if necessary */ 488105197Ssam if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */ 489105197Ssam dst->sa.sa_family != AF_INET || /* PF mismatch */ 490105197Ssam#if 0 491105197Ssam (sav->flags & SADB_X_SAFLAGS_TUNNEL) || /* Tunnel requ'd */ 492105197Ssam sav->tdb_xform->xf_type == XF_IP4 || /* ditto */ 493105197Ssam#endif 494105197Ssam (dst->sa.sa_family == AF_INET && /* Proxy */ 495105197Ssam dst->sin.sin_addr.s_addr != INADDR_ANY && 496105197Ssam dst->sin.sin_addr.s_addr != ip->ip_dst.s_addr)) { 497105197Ssam struct mbuf *mp; 498105197Ssam 499105197Ssam /* Fix IPv4 header checksum and length */ 500105197Ssam if (m->m_len < sizeof (struct ip) && 501105197Ssam (m = m_pullup(m, sizeof (struct ip))) == NULL) { 502105197Ssam error = ENOBUFS; 503105197Ssam goto bad; 504105197Ssam } 505105197Ssam ip = mtod(m, struct ip *); 506105197Ssam ip->ip_len = htons(m->m_pkthdr.len); 507105197Ssam ip->ip_sum = 0; 508105197Ssam#ifdef _IP_VHL 509105197Ssam if (ip->ip_vhl == IP_VHL_BORING) 510105197Ssam ip->ip_sum = in_cksum_hdr(ip); 511105197Ssam else 512105197Ssam ip->ip_sum = in_cksum(m, 513105197Ssam _IP_VHL_HL(ip->ip_vhl) << 2); 514105197Ssam#else 515105197Ssam ip->ip_sum = in_cksum(m, ip->ip_hl << 2); 516105197Ssam#endif 517105197Ssam 518105197Ssam /* Encapsulate the packet */ 519105197Ssam error = ipip_output(m, isr, &mp, 0, 0); 520105197Ssam if (mp == NULL && !error) { 521105197Ssam /* Should never happen. */ 522120585Ssam DPRINTF(("%s: ipip_output returns no mbuf and " 523120585Ssam "no error!", __func__)); 524105197Ssam error = EFAULT; 525105197Ssam } 526105197Ssam if (error) { 527124765Ssam if (mp) { 528124765Ssam /* XXX: Should never happen! */ 529105197Ssam m_freem(mp); 530124765Ssam } 531124765Ssam m = NULL; /* ipip_output() already freed it */ 532105197Ssam goto bad; 533105197Ssam } 534105197Ssam m = mp, mp = NULL; 535105197Ssam /* 536105197Ssam * ipip_output clears IP_DF in the new header. If 537105197Ssam * we need to propagate IP_DF from the outer header, 538105197Ssam * then we have to do it here. 539105197Ssam * 540105197Ssam * XXX shouldn't assume what ipip_output does. 541105197Ssam */ 542105197Ssam if (dst->sa.sa_family == AF_INET && setdf) { 543105197Ssam if (m->m_len < sizeof (struct ip) && 544105197Ssam (m = m_pullup(m, sizeof (struct ip))) == NULL) { 545105197Ssam error = ENOBUFS; 546105197Ssam goto bad; 547105197Ssam } 548105197Ssam ip = mtod(m, struct ip *); 549105197Ssam ip->ip_off = ntohs(ip->ip_off); 550105197Ssam ip->ip_off |= IP_DF; 551105197Ssam ip->ip_off = htons(ip->ip_off); 552105197Ssam } 553105197Ssam } 554105197Ssam } 555105197Ssam 556159965Sthompsa#ifdef DEV_ENC 557159965Sthompsa /* pass the mbuf to enc0 for bpf processing */ 558174054Sbz ipsec_bpf(m, sav, AF_INET, ENC_OUT|ENC_AFTER); 559174054Sbz /* pass the mbuf to enc0 for packet filtering */ 560174054Sbz if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_AFTER)) != 0) 561174054Sbz goto bad; 562159965Sthompsa#endif 563159965Sthompsa 564105197Ssam /* 565105197Ssam * Dispatch to the appropriate IPsec transform logic. The 566105197Ssam * packet will be returned for transmission after crypto 567105197Ssam * processing, etc. are completed. For encapsulation we 568105197Ssam * bypass this call because of the explicit call done above 569105197Ssam * (necessary to deal with IP_DF handling for IPv4). 570105197Ssam * 571105197Ssam * NB: m & sav are ``passed to caller'' who's reponsible for 572105197Ssam * for reclaiming their resources. 573105197Ssam */ 574105197Ssam if (sav->tdb_xform->xf_type != XF_IP4) { 575105197Ssam ip = mtod(m, struct ip *); 576105197Ssam i = ip->ip_hl << 2; 577105197Ssam off = offsetof(struct ip, ip_p); 578105197Ssam error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off); 579105197Ssam } else { 580105197Ssam error = ipsec_process_done(m, isr); 581105197Ssam } 582120585Ssam IPSECREQUEST_UNLOCK(isr); 583105197Ssam return error; 584105197Ssambad: 585120585Ssam if (isr) 586120585Ssam IPSECREQUEST_UNLOCK(isr); 587105197Ssam if (m) 588105197Ssam m_freem(m); 589105197Ssam return error; 590105197Ssam} 591105197Ssam#endif 592105197Ssam 593105197Ssam#ifdef INET6 594105197Ssam/* 595105197Ssam * Chop IP6 header from the payload. 596105197Ssam */ 597105197Ssamstatic struct mbuf * 598105197Ssamipsec6_splithdr(struct mbuf *m) 599105197Ssam{ 600105197Ssam struct mbuf *mh; 601105197Ssam struct ip6_hdr *ip6; 602105197Ssam int hlen; 603105197Ssam 604120585Ssam IPSEC_ASSERT(m->m_len >= sizeof (struct ip6_hdr), 605120585Ssam ("first mbuf too short, len %u", m->m_len)); 606105197Ssam ip6 = mtod(m, struct ip6_hdr *); 607105197Ssam hlen = sizeof(struct ip6_hdr); 608105197Ssam if (m->m_len > hlen) { 609151967Sandre MGETHDR(mh, M_DONTWAIT, MT_DATA); 610105197Ssam if (!mh) { 611105197Ssam m_freem(m); 612105197Ssam return NULL; 613105197Ssam } 614108466Ssam M_MOVE_PKTHDR(mh, m); 615105197Ssam MH_ALIGN(mh, hlen); 616105197Ssam m->m_len -= hlen; 617105197Ssam m->m_data += hlen; 618105197Ssam mh->m_next = m; 619105197Ssam m = mh; 620105197Ssam m->m_len = hlen; 621105197Ssam bcopy((caddr_t)ip6, mtod(m, caddr_t), hlen); 622105197Ssam } else if (m->m_len < hlen) { 623105197Ssam m = m_pullup(m, hlen); 624105197Ssam if (!m) 625105197Ssam return NULL; 626105197Ssam } 627105197Ssam return m; 628105197Ssam} 629105197Ssam 630105197Ssam/* 631105197Ssam * IPsec output logic for IPv6, transport mode. 632105197Ssam */ 633105197Ssamint 634105197Ssamipsec6_output_trans( 635105197Ssam struct ipsec_output_state *state, 636105197Ssam u_char *nexthdrp, 637105197Ssam struct mbuf *mprev, 638105197Ssam struct secpolicy *sp, 639105197Ssam int flags, 640105197Ssam int *tun) 641105197Ssam{ 642105197Ssam struct ipsecrequest *isr; 643105197Ssam struct secasindex saidx; 644105197Ssam int error = 0; 645105197Ssam struct mbuf *m; 646105197Ssam 647120585Ssam IPSEC_ASSERT(state != NULL, ("null state")); 648120585Ssam IPSEC_ASSERT(state->m != NULL, ("null m")); 649120585Ssam IPSEC_ASSERT(nexthdrp != NULL, ("null nexthdrp")); 650120585Ssam IPSEC_ASSERT(mprev != NULL, ("null mprev")); 651120585Ssam IPSEC_ASSERT(sp != NULL, ("null sp")); 652120585Ssam IPSEC_ASSERT(tun != NULL, ("null tun")); 653105197Ssam 654105197Ssam KEYDEBUG(KEYDEBUG_IPSEC_DATA, 655170122Sbz printf("%s: applied SP\n", __func__); 656105197Ssam kdebug_secpolicy(sp)); 657105197Ssam 658105197Ssam isr = sp->req; 659105197Ssam if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 660105197Ssam /* the rest will be handled by ipsec6_output_tunnel() */ 661105197Ssam *tun = 1; /* need tunnel-mode processing */ 662105197Ssam return 0; 663105197Ssam } 664105197Ssam 665105197Ssam *tun = 0; 666105197Ssam m = state->m; 667105197Ssam 668171133Sgnn IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */ 669105197Ssam isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error); 670105197Ssam if (isr == NULL) { 671177175Sbz if (error != 0) { 672105197Ssam#ifdef notdef 673177175Sbz /* XXX should notification be done for all errors ? */ 674177175Sbz /* 675177175Sbz * Notify the fact that the packet is discarded 676177175Sbz * to ourselves. I believe this is better than 677177175Sbz * just silently discarding. (jinmei@kame.net) 678177175Sbz * XXX: should we restrict the error to TCP packets? 679177175Sbz * XXX: should we directly notify sockets via 680177175Sbz * pfctlinputs? 681177175Sbz */ 682177175Sbz icmp6_error(m, ICMP6_DST_UNREACH, 683177175Sbz ICMP6_DST_UNREACH_ADMIN, 0); 684177175Sbz m = NULL; /* NB: icmp6_error frees mbuf */ 685105197Ssam#endif 686177175Sbz goto bad; 687177175Sbz } 688177175Sbz return EJUSTRETURN; 689105197Ssam } 690105197Ssam 691171133Sgnn error = (*isr->sav->tdb_xform->xf_output)(m, isr, NULL, 692171133Sgnn sizeof (struct ip6_hdr), 693171133Sgnn offsetof(struct ip6_hdr, 694171133Sgnn ip6_nxt)); 695171133Sgnn IPSECREQUEST_UNLOCK(isr); 696171133Sgnn return error; 697105197Ssambad: 698171133Sgnn if (isr) 699171133Sgnn IPSECREQUEST_UNLOCK(isr); 700105197Ssam if (m) 701105197Ssam m_freem(m); 702105197Ssam state->m = NULL; 703105197Ssam return error; 704105197Ssam} 705105197Ssam 706105197Ssamstatic int 707105197Ssamipsec6_encapsulate(struct mbuf *m, struct secasvar *sav) 708105197Ssam{ 709105197Ssam struct ip6_hdr *oip6; 710105197Ssam struct ip6_hdr *ip6; 711105197Ssam size_t plen; 712105197Ssam 713105197Ssam /* can't tunnel between different AFs */ 714105197Ssam if (sav->sah->saidx.src.sa.sa_family != AF_INET6 || 715105197Ssam sav->sah->saidx.dst.sa.sa_family != AF_INET6) { 716105197Ssam m_freem(m); 717105197Ssam return EINVAL; 718105197Ssam } 719171133Sgnn IPSEC_ASSERT(m->m_len == sizeof (struct ip6_hdr), 720120585Ssam ("mbuf wrong size; len %u", m->m_len)); 721105197Ssam 722105197Ssam 723105197Ssam /* 724105197Ssam * grow the mbuf to accomodate the new IPv6 header. 725105197Ssam */ 726105197Ssam plen = m->m_pkthdr.len; 727105197Ssam if (M_LEADINGSPACE(m->m_next) < sizeof(struct ip6_hdr)) { 728105197Ssam struct mbuf *n; 729111119Simp MGET(n, M_DONTWAIT, MT_DATA); 730105197Ssam if (!n) { 731105197Ssam m_freem(m); 732105197Ssam return ENOBUFS; 733105197Ssam } 734105197Ssam n->m_len = sizeof(struct ip6_hdr); 735105197Ssam n->m_next = m->m_next; 736105197Ssam m->m_next = n; 737105197Ssam m->m_pkthdr.len += sizeof(struct ip6_hdr); 738105197Ssam oip6 = mtod(n, struct ip6_hdr *); 739105197Ssam } else { 740105197Ssam m->m_next->m_len += sizeof(struct ip6_hdr); 741105197Ssam m->m_next->m_data -= sizeof(struct ip6_hdr); 742105197Ssam m->m_pkthdr.len += sizeof(struct ip6_hdr); 743105197Ssam oip6 = mtod(m->m_next, struct ip6_hdr *); 744105197Ssam } 745105197Ssam ip6 = mtod(m, struct ip6_hdr *); 746113076Sdes bcopy((caddr_t)ip6, (caddr_t)oip6, sizeof(struct ip6_hdr)); 747105197Ssam 748105197Ssam /* Fake link-local scope-class addresses */ 749105197Ssam if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src)) 750105197Ssam oip6->ip6_src.s6_addr16[1] = 0; 751105197Ssam if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst)) 752105197Ssam oip6->ip6_dst.s6_addr16[1] = 0; 753105197Ssam 754105197Ssam /* construct new IPv6 header. see RFC 2401 5.1.2.2 */ 755105197Ssam /* ECN consideration. */ 756181803Sbz ip6_ecn_ingress(V_ip6_ipsec_ecn, &ip6->ip6_flow, &oip6->ip6_flow); 757105197Ssam if (plen < IPV6_MAXPACKET - sizeof(struct ip6_hdr)) 758105197Ssam ip6->ip6_plen = htons(plen); 759105197Ssam else { 760105197Ssam /* ip6->ip6_plen will be updated in ip6_output() */ 761105197Ssam } 762105197Ssam ip6->ip6_nxt = IPPROTO_IPV6; 763171133Sgnn ip6->ip6_src = sav->sah->saidx.src.sin6.sin6_addr; 764171133Sgnn ip6->ip6_dst = sav->sah->saidx.dst.sin6.sin6_addr; 765105197Ssam ip6->ip6_hlim = IPV6_DEFHLIM; 766105197Ssam 767105197Ssam /* XXX Should ip6_src be updated later ? */ 768105197Ssam 769105197Ssam return 0; 770105197Ssam} 771105197Ssam 772105197Ssam/* 773105197Ssam * IPsec output logic for IPv6, tunnel mode. 774105197Ssam */ 775105197Ssamint 776105197Ssamipsec6_output_tunnel(struct ipsec_output_state *state, struct secpolicy *sp, int flags) 777105197Ssam{ 778105197Ssam struct ip6_hdr *ip6; 779105197Ssam struct ipsecrequest *isr; 780105197Ssam struct secasindex saidx; 781105197Ssam int error; 782213836Sbz struct sockaddr_in6 *dst6; 783105197Ssam struct mbuf *m; 784105197Ssam 785120585Ssam IPSEC_ASSERT(state != NULL, ("null state")); 786120585Ssam IPSEC_ASSERT(state->m != NULL, ("null m")); 787120585Ssam IPSEC_ASSERT(sp != NULL, ("null sp")); 788105197Ssam 789105197Ssam KEYDEBUG(KEYDEBUG_IPSEC_DATA, 790170122Sbz printf("%s: applied SP\n", __func__); 791105197Ssam kdebug_secpolicy(sp)); 792105197Ssam 793105197Ssam m = state->m; 794105197Ssam /* 795105197Ssam * transport mode ipsec (before the 1st tunnel mode) is already 796105197Ssam * processed by ipsec6_output_trans(). 797105197Ssam */ 798105197Ssam for (isr = sp->req; isr; isr = isr->next) { 799105197Ssam if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 800105197Ssam break; 801105197Ssam } 802170123Sbz 803170123Sbz IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */ 804105197Ssam isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error); 805177175Sbz if (isr == NULL) { 806177175Sbz if (error != 0) 807177175Sbz goto bad; 808177175Sbz return EJUSTRETURN; 809177175Sbz } 810105197Ssam 811174054Sbz#ifdef DEV_ENC 812181627Svanhu encif->if_opackets++; 813181627Svanhu encif->if_obytes += m->m_pkthdr.len; 814181627Svanhu 815174054Sbz /* pass the mbuf to enc0 for bpf processing */ 816174054Sbz ipsec_bpf(m, isr->sav, AF_INET6, ENC_OUT|ENC_BEFORE); 817174054Sbz /* pass the mbuf to enc0 for packet filtering */ 818174054Sbz if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_BEFORE)) != 0) 819174054Sbz goto bad; 820174054Sbz#endif 821174054Sbz 822105197Ssam /* 823105197Ssam * There may be the case that SA status will be changed when 824105197Ssam * we are refering to one. So calling splsoftnet(). 825105197Ssam */ 826105197Ssam if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 827105197Ssam /* 828105197Ssam * build IPsec tunnel. 829105197Ssam */ 830105197Ssam /* XXX should be processed with other familiy */ 831105197Ssam if (isr->sav->sah->saidx.src.sa.sa_family != AF_INET6) { 832120585Ssam ipseclog((LOG_ERR, "%s: family mismatched between " 833120585Ssam "inner and outer, spi=%u\n", __func__, 834105197Ssam ntohl(isr->sav->spi))); 835181803Sbz V_ipsec6stat.ips_out_inval++; 836105197Ssam error = EAFNOSUPPORT; 837105197Ssam goto bad; 838105197Ssam } 839105197Ssam 840105197Ssam m = ipsec6_splithdr(m); 841105197Ssam if (!m) { 842181803Sbz V_ipsec6stat.ips_out_nomem++; 843105197Ssam error = ENOMEM; 844105197Ssam goto bad; 845105197Ssam } 846105197Ssam error = ipsec6_encapsulate(m, isr->sav); 847105197Ssam if (error) { 848105197Ssam m = NULL; 849105197Ssam goto bad; 850105197Ssam } 851105197Ssam ip6 = mtod(m, struct ip6_hdr *); 852105197Ssam 853214250Sbz state->ro = 854214250Sbz (struct route *)&isr->sav->sah->route_cache.sin6_route; 855105197Ssam state->dst = (struct sockaddr *)&state->ro->ro_dst; 856105197Ssam dst6 = (struct sockaddr_in6 *)state->dst; 857105197Ssam if (state->ro->ro_rt 858105197Ssam && ((state->ro->ro_rt->rt_flags & RTF_UP) == 0 859105197Ssam || !IN6_ARE_ADDR_EQUAL(&dst6->sin6_addr, &ip6->ip6_dst))) { 860105197Ssam RTFREE(state->ro->ro_rt); 861105197Ssam state->ro->ro_rt = NULL; 862105197Ssam } 863187936Sbz if (state->ro->ro_rt == NULL) { 864105197Ssam bzero(dst6, sizeof(*dst6)); 865105197Ssam dst6->sin6_family = AF_INET6; 866105197Ssam dst6->sin6_len = sizeof(*dst6); 867105197Ssam dst6->sin6_addr = ip6->ip6_dst; 868105197Ssam rtalloc(state->ro); 869105197Ssam } 870187936Sbz if (state->ro->ro_rt == NULL) { 871181803Sbz V_ip6stat.ip6s_noroute++; 872181803Sbz V_ipsec6stat.ips_out_noroute++; 873105197Ssam error = EHOSTUNREACH; 874105197Ssam goto bad; 875105197Ssam } 876105197Ssam 877105197Ssam /* adjust state->dst if tunnel endpoint is offlink */ 878213837Sbz if (state->ro->ro_rt->rt_flags & RTF_GATEWAY) 879105197Ssam state->dst = (struct sockaddr *)state->ro->ro_rt->rt_gateway; 880105197Ssam } 881105197Ssam 882105197Ssam m = ipsec6_splithdr(m); 883105197Ssam if (!m) { 884181803Sbz V_ipsec6stat.ips_out_nomem++; 885105197Ssam error = ENOMEM; 886105197Ssam goto bad; 887105197Ssam } 888105197Ssam ip6 = mtod(m, struct ip6_hdr *); 889174054Sbz 890174054Sbz#ifdef DEV_ENC 891174054Sbz /* pass the mbuf to enc0 for bpf processing */ 892174054Sbz ipsec_bpf(m, isr->sav, AF_INET6, ENC_OUT|ENC_AFTER); 893174054Sbz /* pass the mbuf to enc0 for packet filtering */ 894174054Sbz if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_AFTER)) != 0) 895174054Sbz goto bad; 896174054Sbz#endif 897174054Sbz 898170123Sbz error = (*isr->sav->tdb_xform->xf_output)(m, isr, NULL, 899105197Ssam sizeof (struct ip6_hdr), 900105197Ssam offsetof(struct ip6_hdr, ip6_nxt)); 901170123Sbz IPSECREQUEST_UNLOCK(isr); 902170123Sbz return error; 903105197Ssambad: 904170123Sbz if (isr) 905170123Sbz IPSECREQUEST_UNLOCK(isr); 906105197Ssam if (m) 907105197Ssam m_freem(m); 908105197Ssam state->m = NULL; 909105197Ssam return error; 910105197Ssam} 911105197Ssam#endif /*INET6*/ 912