ipsec_output.c revision 124765
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 124765 2004-01-20 22:45:10Z sam $ 27112758Ssam */ 28105197Ssam 29105197Ssam/* 30105197Ssam * IPsec output processing. 31105197Ssam */ 32105197Ssam#include "opt_inet.h" 33105197Ssam#include "opt_inet6.h" 34105197Ssam#include "opt_ipsec.h" 35105197Ssam 36105197Ssam#include <sys/param.h> 37105197Ssam#include <sys/systm.h> 38105197Ssam#include <sys/mbuf.h> 39105197Ssam#include <sys/domain.h> 40105197Ssam#include <sys/protosw.h> 41105197Ssam#include <sys/socket.h> 42105197Ssam#include <sys/errno.h> 43105197Ssam#include <sys/syslog.h> 44105197Ssam 45105197Ssam#include <net/if.h> 46105197Ssam#include <net/route.h> 47105197Ssam 48105197Ssam#include <netinet/in.h> 49105197Ssam#include <netinet/in_systm.h> 50105197Ssam#include <netinet/ip.h> 51105197Ssam#include <netinet/ip_var.h> 52105197Ssam#include <netinet/in_var.h> 53105197Ssam#include <netinet/ip_ecn.h> 54105197Ssam#ifdef INET6 55105197Ssam#include <netinet6/ip6_ecn.h> 56105197Ssam#endif 57105197Ssam 58105197Ssam#include <netinet/ip6.h> 59105197Ssam#ifdef INET6 60105197Ssam#include <netinet6/ip6_var.h> 61105197Ssam#endif 62105197Ssam#include <netinet/in_pcb.h> 63105197Ssam#ifdef INET6 64105197Ssam#include <netinet/icmp6.h> 65105197Ssam#endif 66105197Ssam 67105197Ssam#include <netipsec/ipsec.h> 68105197Ssam#ifdef INET6 69105197Ssam#include <netipsec/ipsec6.h> 70105197Ssam#endif 71105197Ssam#include <netipsec/ah_var.h> 72105197Ssam#include <netipsec/esp_var.h> 73105197Ssam#include <netipsec/ipcomp_var.h> 74105197Ssam 75105197Ssam#include <netipsec/xform.h> 76105197Ssam 77105197Ssam#include <netipsec/key.h> 78105197Ssam#include <netipsec/keydb.h> 79105197Ssam#include <netipsec/key_debug.h> 80105197Ssam 81105197Ssam#include <machine/in_cksum.h> 82105197Ssam 83105197Ssamint 84105197Ssamipsec_process_done(struct mbuf *m, struct ipsecrequest *isr) 85105197Ssam{ 86105197Ssam struct tdb_ident *tdbi; 87105197Ssam struct m_tag *mtag; 88105197Ssam struct secasvar *sav; 89105197Ssam struct secasindex *saidx; 90105197Ssam int error; 91105197Ssam 92120585Ssam IPSEC_SPLASSERT_SOFTNET(__func__); 93105197Ssam 94120585Ssam IPSEC_ASSERT(m != NULL, ("null mbuf")); 95120585Ssam IPSEC_ASSERT(isr != NULL, ("null ISR")); 96105197Ssam sav = isr->sav; 97120585Ssam IPSEC_ASSERT(sav != NULL, ("null SA")); 98120585Ssam IPSEC_ASSERT(sav->sah != NULL, ("null SAH")); 99105197Ssam 100105197Ssam saidx = &sav->sah->saidx; 101105197Ssam switch (saidx->dst.sa.sa_family) { 102105197Ssam#ifdef INET 103105197Ssam case AF_INET: 104105197Ssam /* Fix the header length, for AH processing. */ 105105197Ssam mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len); 106105197Ssam break; 107105197Ssam#endif /* INET */ 108105197Ssam#ifdef INET6 109105197Ssam case AF_INET6: 110105197Ssam /* Fix the header length, for AH processing. */ 111105197Ssam if (m->m_pkthdr.len < sizeof (struct ip6_hdr)) { 112105197Ssam error = ENXIO; 113105197Ssam goto bad; 114105197Ssam } 115105197Ssam if (m->m_pkthdr.len - sizeof (struct ip6_hdr) > IPV6_MAXPACKET) { 116105197Ssam /* No jumbogram support. */ 117105197Ssam error = ENXIO; /*?*/ 118105197Ssam goto bad; 119105197Ssam } 120105197Ssam mtod(m, struct ip6_hdr *)->ip6_plen = 121105197Ssam htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 122105197Ssam break; 123105197Ssam#endif /* INET6 */ 124105197Ssam default: 125120585Ssam DPRINTF(("%s: unknown protocol family %u\n", __func__, 126105197Ssam saidx->dst.sa.sa_family)); 127105197Ssam error = ENXIO; 128105197Ssam goto bad; 129105197Ssam } 130105197Ssam 131105197Ssam /* 132105197Ssam * Add a record of what we've done or what needs to be done to the 133105197Ssam * packet. 134105197Ssam */ 135105197Ssam mtag = m_tag_get(PACKET_TAG_IPSEC_OUT_DONE, 136105197Ssam sizeof(struct tdb_ident), M_NOWAIT); 137105197Ssam if (mtag == NULL) { 138120585Ssam DPRINTF(("%s: could not get packet tag\n", __func__)); 139105197Ssam error = ENOMEM; 140105197Ssam goto bad; 141105197Ssam } 142105197Ssam 143105197Ssam tdbi = (struct tdb_ident *)(mtag + 1); 144105197Ssam tdbi->dst = saidx->dst; 145105197Ssam tdbi->proto = saidx->proto; 146105197Ssam tdbi->spi = sav->spi; 147105197Ssam m_tag_prepend(m, mtag); 148105197Ssam 149105197Ssam /* 150105197Ssam * If there's another (bundled) SA to apply, do so. 151105197Ssam * Note that this puts a burden on the kernel stack size. 152105197Ssam * If this is a problem we'll need to introduce a queue 153105197Ssam * to set the packet on so we can unwind the stack before 154105197Ssam * doing further processing. 155105197Ssam */ 156105197Ssam if (isr->next) { 157105197Ssam newipsecstat.ips_out_bundlesa++; 158105197Ssam return ipsec4_process_packet(m, isr->next, 0, 0); 159105197Ssam } 160117056Ssam key_sa_recordxfer(sav, m); /* record data transfer */ 161105197Ssam 162105197Ssam /* 163105197Ssam * We're done with IPsec processing, transmit the packet using the 164105197Ssam * appropriate network protocol (IP or IPv6). SPD lookup will be 165105197Ssam * performed again there. 166105197Ssam */ 167105197Ssam switch (saidx->dst.sa.sa_family) { 168105197Ssam#ifdef INET 169105197Ssam struct ip *ip; 170105197Ssam case AF_INET: 171105197Ssam ip = mtod(m, struct ip *); 172105197Ssam ip->ip_len = ntohs(ip->ip_len); 173105197Ssam ip->ip_off = ntohs(ip->ip_off); 174105197Ssam 175105197Ssam return ip_output(m, NULL, NULL, IP_RAWOUTPUT, NULL, NULL); 176105197Ssam#endif /* INET */ 177105197Ssam#ifdef INET6 178105197Ssam case AF_INET6: 179105197Ssam /* 180105197Ssam * We don't need massage, IPv6 header fields are always in 181105197Ssam * net endian. 182105197Ssam */ 183105197Ssam return ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL); 184105197Ssam#endif /* INET6 */ 185105197Ssam } 186105197Ssam panic("ipsec_process_done"); 187105197Ssambad: 188105197Ssam m_freem(m); 189105197Ssam KEY_FREESAV(&sav); 190105197Ssam return (error); 191105197Ssam} 192105197Ssam 193105197Ssamstatic struct ipsecrequest * 194105197Ssamipsec_nextisr( 195105197Ssam struct mbuf *m, 196105197Ssam struct ipsecrequest *isr, 197105197Ssam int af, 198105197Ssam struct secasindex *saidx, 199105197Ssam int *error 200105197Ssam) 201105197Ssam{ 202105197Ssam#define IPSEC_OSTAT(x,y,z) (isr->saidx.proto == IPPROTO_ESP ? (x)++ : \ 203105197Ssam isr->saidx.proto == IPPROTO_AH ? (y)++ : (z)++) 204105197Ssam struct secasvar *sav; 205105197Ssam 206120585Ssam IPSEC_SPLASSERT_SOFTNET(__func__); 207120585Ssam IPSECREQUEST_LOCK_ASSERT(isr); 208120585Ssam 209120585Ssam IPSEC_ASSERT(af == AF_INET || af == AF_INET6, 210120585Ssam ("invalid address family %u", af)); 211105197Ssamagain: 212105197Ssam /* 213105197Ssam * Craft SA index to search for proper SA. Note that 214105197Ssam * we only fillin unspecified SA peers for transport 215105197Ssam * mode; for tunnel mode they must already be filled in. 216105197Ssam */ 217105197Ssam *saidx = isr->saidx; 218105197Ssam if (isr->saidx.mode == IPSEC_MODE_TRANSPORT) { 219105197Ssam /* Fillin unspecified SA peers only for transport mode */ 220105197Ssam if (af == AF_INET) { 221105197Ssam struct sockaddr_in *sin; 222105197Ssam struct ip *ip = mtod(m, struct ip *); 223105197Ssam 224105197Ssam if (saidx->src.sa.sa_len == 0) { 225105197Ssam sin = &saidx->src.sin; 226105197Ssam sin->sin_len = sizeof(*sin); 227105197Ssam sin->sin_family = AF_INET; 228105197Ssam sin->sin_port = IPSEC_PORT_ANY; 229105197Ssam sin->sin_addr = ip->ip_src; 230105197Ssam } 231105197Ssam if (saidx->dst.sa.sa_len == 0) { 232105197Ssam sin = &saidx->dst.sin; 233105197Ssam sin->sin_len = sizeof(*sin); 234105197Ssam sin->sin_family = AF_INET; 235105197Ssam sin->sin_port = IPSEC_PORT_ANY; 236105197Ssam sin->sin_addr = ip->ip_dst; 237105197Ssam } 238105197Ssam } else { 239105197Ssam struct sockaddr_in6 *sin6; 240105197Ssam struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 241105197Ssam 242105197Ssam if (saidx->src.sin6.sin6_len == 0) { 243105197Ssam sin6 = (struct sockaddr_in6 *)&saidx->src; 244105197Ssam sin6->sin6_len = sizeof(*sin6); 245105197Ssam sin6->sin6_family = AF_INET6; 246105197Ssam sin6->sin6_port = IPSEC_PORT_ANY; 247105197Ssam sin6->sin6_addr = ip6->ip6_src; 248105197Ssam if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 249105197Ssam /* fix scope id for comparing SPD */ 250105197Ssam sin6->sin6_addr.s6_addr16[1] = 0; 251105197Ssam sin6->sin6_scope_id = 252105197Ssam ntohs(ip6->ip6_src.s6_addr16[1]); 253105197Ssam } 254105197Ssam } 255105197Ssam if (saidx->dst.sin6.sin6_len == 0) { 256105197Ssam sin6 = (struct sockaddr_in6 *)&saidx->dst; 257105197Ssam sin6->sin6_len = sizeof(*sin6); 258105197Ssam sin6->sin6_family = AF_INET6; 259105197Ssam sin6->sin6_port = IPSEC_PORT_ANY; 260105197Ssam sin6->sin6_addr = ip6->ip6_dst; 261105197Ssam if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 262105197Ssam /* fix scope id for comparing SPD */ 263105197Ssam sin6->sin6_addr.s6_addr16[1] = 0; 264105197Ssam sin6->sin6_scope_id = 265105197Ssam ntohs(ip6->ip6_dst.s6_addr16[1]); 266105197Ssam } 267105197Ssam } 268105197Ssam } 269105197Ssam } 270105197Ssam 271105197Ssam /* 272105197Ssam * Lookup SA and validate it. 273105197Ssam */ 274105197Ssam *error = key_checkrequest(isr, saidx); 275105197Ssam if (*error != 0) { 276105197Ssam /* 277105197Ssam * IPsec processing is required, but no SA found. 278105197Ssam * I assume that key_acquire() had been called 279105197Ssam * to get/establish the SA. Here I discard 280105197Ssam * this packet because it is responsibility for 281105197Ssam * upper layer to retransmit the packet. 282105197Ssam */ 283105197Ssam newipsecstat.ips_out_nosa++; 284105197Ssam goto bad; 285105197Ssam } 286105197Ssam sav = isr->sav; 287105197Ssam if (sav == NULL) { /* XXX valid return */ 288120585Ssam IPSEC_ASSERT(ipsec_get_reqlevel(isr) == IPSEC_LEVEL_USE, 289120585Ssam ("no SA found, but required; level %u", 290105197Ssam ipsec_get_reqlevel(isr))); 291120585Ssam IPSECREQUEST_UNLOCK(isr); 292105197Ssam isr = isr->next; 293105197Ssam if (isr == NULL) { 294105197Ssam /*XXXstatistic??*/ 295105197Ssam *error = EINVAL; /*XXX*/ 296105197Ssam return isr; 297105197Ssam } 298120585Ssam IPSECREQUEST_LOCK(isr); 299105197Ssam goto again; 300105197Ssam } 301105197Ssam 302105197Ssam /* 303105197Ssam * Check system global policy controls. 304105197Ssam */ 305105197Ssam if ((isr->saidx.proto == IPPROTO_ESP && !esp_enable) || 306105197Ssam (isr->saidx.proto == IPPROTO_AH && !ah_enable) || 307105197Ssam (isr->saidx.proto == IPPROTO_IPCOMP && !ipcomp_enable)) { 308120585Ssam DPRINTF(("%s: IPsec outbound packet dropped due" 309120585Ssam " to policy (check your sysctls)\n", __func__)); 310105197Ssam IPSEC_OSTAT(espstat.esps_pdrops, ahstat.ahs_pdrops, 311105197Ssam ipcompstat.ipcomps_pdrops); 312105197Ssam *error = EHOSTUNREACH; 313105197Ssam goto bad; 314105197Ssam } 315105197Ssam 316105197Ssam /* 317105197Ssam * Sanity check the SA contents for the caller 318105197Ssam * before they invoke the xform output method. 319105197Ssam */ 320105197Ssam if (sav->tdb_xform == NULL) { 321120585Ssam DPRINTF(("%s: no transform for SA\n", __func__)); 322105197Ssam IPSEC_OSTAT(espstat.esps_noxform, ahstat.ahs_noxform, 323105197Ssam ipcompstat.ipcomps_noxform); 324105197Ssam *error = EHOSTUNREACH; 325105197Ssam goto bad; 326105197Ssam } 327105197Ssam return isr; 328105197Ssambad: 329120585Ssam IPSEC_ASSERT(*error != 0, ("error return w/ no error code")); 330120585Ssam IPSECREQUEST_UNLOCK(isr); 331105197Ssam return NULL; 332105197Ssam#undef IPSEC_OSTAT 333105197Ssam} 334105197Ssam 335105197Ssam#ifdef INET 336105197Ssam/* 337105197Ssam * IPsec output logic for IPv4. 338105197Ssam */ 339105197Ssamint 340105197Ssamipsec4_process_packet( 341105197Ssam struct mbuf *m, 342105197Ssam struct ipsecrequest *isr, 343105197Ssam int flags, 344105197Ssam int tunalready) 345105197Ssam{ 346105197Ssam struct secasindex saidx; 347105197Ssam struct secasvar *sav; 348105197Ssam struct ip *ip; 349119643Ssam int error, i, off; 350105197Ssam 351120585Ssam IPSEC_ASSERT(m != NULL, ("null mbuf")); 352120585Ssam IPSEC_ASSERT(isr != NULL, ("null isr")); 353105197Ssam 354120585Ssam IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */ 355105197Ssam 356105197Ssam isr = ipsec_nextisr(m, isr, AF_INET, &saidx, &error); 357105197Ssam if (isr == NULL) 358105197Ssam goto bad; 359105197Ssam 360105197Ssam sav = isr->sav; 361105197Ssam if (!tunalready) { 362105197Ssam union sockaddr_union *dst = &sav->sah->saidx.dst; 363105197Ssam int setdf; 364105197Ssam 365105197Ssam /* 366105197Ssam * Collect IP_DF state from the outer header. 367105197Ssam */ 368105197Ssam if (dst->sa.sa_family == AF_INET) { 369105197Ssam if (m->m_len < sizeof (struct ip) && 370105197Ssam (m = m_pullup(m, sizeof (struct ip))) == NULL) { 371105197Ssam error = ENOBUFS; 372105197Ssam goto bad; 373105197Ssam } 374105197Ssam ip = mtod(m, struct ip *); 375105197Ssam /* Honor system-wide control of how to handle IP_DF */ 376105197Ssam switch (ip4_ipsec_dfbit) { 377105197Ssam case 0: /* clear in outer header */ 378105197Ssam case 1: /* set in outer header */ 379105197Ssam setdf = ip4_ipsec_dfbit; 380105197Ssam break; 381105197Ssam default: /* propagate to outer header */ 382105197Ssam setdf = ntohs(ip->ip_off & IP_DF); 383105197Ssam break; 384105197Ssam } 385105197Ssam } else { 386105197Ssam ip = NULL; /* keep compiler happy */ 387105197Ssam setdf = 0; 388105197Ssam } 389105197Ssam /* Do the appropriate encapsulation, if necessary */ 390105197Ssam if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */ 391105197Ssam dst->sa.sa_family != AF_INET || /* PF mismatch */ 392105197Ssam#if 0 393105197Ssam (sav->flags & SADB_X_SAFLAGS_TUNNEL) || /* Tunnel requ'd */ 394105197Ssam sav->tdb_xform->xf_type == XF_IP4 || /* ditto */ 395105197Ssam#endif 396105197Ssam (dst->sa.sa_family == AF_INET && /* Proxy */ 397105197Ssam dst->sin.sin_addr.s_addr != INADDR_ANY && 398105197Ssam dst->sin.sin_addr.s_addr != ip->ip_dst.s_addr)) { 399105197Ssam struct mbuf *mp; 400105197Ssam 401105197Ssam /* Fix IPv4 header checksum and length */ 402105197Ssam if (m->m_len < sizeof (struct ip) && 403105197Ssam (m = m_pullup(m, sizeof (struct ip))) == NULL) { 404105197Ssam error = ENOBUFS; 405105197Ssam goto bad; 406105197Ssam } 407105197Ssam ip = mtod(m, struct ip *); 408105197Ssam ip->ip_len = htons(m->m_pkthdr.len); 409105197Ssam ip->ip_sum = 0; 410105197Ssam#ifdef _IP_VHL 411105197Ssam if (ip->ip_vhl == IP_VHL_BORING) 412105197Ssam ip->ip_sum = in_cksum_hdr(ip); 413105197Ssam else 414105197Ssam ip->ip_sum = in_cksum(m, 415105197Ssam _IP_VHL_HL(ip->ip_vhl) << 2); 416105197Ssam#else 417105197Ssam ip->ip_sum = in_cksum(m, ip->ip_hl << 2); 418105197Ssam#endif 419105197Ssam 420105197Ssam /* Encapsulate the packet */ 421105197Ssam error = ipip_output(m, isr, &mp, 0, 0); 422105197Ssam if (mp == NULL && !error) { 423105197Ssam /* Should never happen. */ 424120585Ssam DPRINTF(("%s: ipip_output returns no mbuf and " 425120585Ssam "no error!", __func__)); 426105197Ssam error = EFAULT; 427105197Ssam } 428105197Ssam if (error) { 429124765Ssam if (mp) { 430124765Ssam /* XXX: Should never happen! */ 431105197Ssam m_freem(mp); 432124765Ssam } 433124765Ssam m = NULL; /* ipip_output() already freed it */ 434105197Ssam goto bad; 435105197Ssam } 436105197Ssam m = mp, mp = NULL; 437105197Ssam /* 438105197Ssam * ipip_output clears IP_DF in the new header. If 439105197Ssam * we need to propagate IP_DF from the outer header, 440105197Ssam * then we have to do it here. 441105197Ssam * 442105197Ssam * XXX shouldn't assume what ipip_output does. 443105197Ssam */ 444105197Ssam if (dst->sa.sa_family == AF_INET && setdf) { 445105197Ssam if (m->m_len < sizeof (struct ip) && 446105197Ssam (m = m_pullup(m, sizeof (struct ip))) == NULL) { 447105197Ssam error = ENOBUFS; 448105197Ssam goto bad; 449105197Ssam } 450105197Ssam ip = mtod(m, struct ip *); 451105197Ssam ip->ip_off = ntohs(ip->ip_off); 452105197Ssam ip->ip_off |= IP_DF; 453105197Ssam ip->ip_off = htons(ip->ip_off); 454105197Ssam } 455105197Ssam } 456105197Ssam } 457105197Ssam 458105197Ssam /* 459105197Ssam * Dispatch to the appropriate IPsec transform logic. The 460105197Ssam * packet will be returned for transmission after crypto 461105197Ssam * processing, etc. are completed. For encapsulation we 462105197Ssam * bypass this call because of the explicit call done above 463105197Ssam * (necessary to deal with IP_DF handling for IPv4). 464105197Ssam * 465105197Ssam * NB: m & sav are ``passed to caller'' who's reponsible for 466105197Ssam * for reclaiming their resources. 467105197Ssam */ 468105197Ssam if (sav->tdb_xform->xf_type != XF_IP4) { 469105197Ssam ip = mtod(m, struct ip *); 470105197Ssam i = ip->ip_hl << 2; 471105197Ssam off = offsetof(struct ip, ip_p); 472105197Ssam error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off); 473105197Ssam } else { 474105197Ssam error = ipsec_process_done(m, isr); 475105197Ssam } 476120585Ssam IPSECREQUEST_UNLOCK(isr); 477105197Ssam return error; 478105197Ssambad: 479120585Ssam if (isr) 480120585Ssam IPSECREQUEST_UNLOCK(isr); 481105197Ssam if (m) 482105197Ssam m_freem(m); 483105197Ssam return error; 484105197Ssam} 485105197Ssam#endif 486105197Ssam 487105197Ssam#ifdef INET6 488105197Ssam/* 489105197Ssam * Chop IP6 header from the payload. 490105197Ssam */ 491105197Ssamstatic struct mbuf * 492105197Ssamipsec6_splithdr(struct mbuf *m) 493105197Ssam{ 494105197Ssam struct mbuf *mh; 495105197Ssam struct ip6_hdr *ip6; 496105197Ssam int hlen; 497105197Ssam 498120585Ssam IPSEC_ASSERT(m->m_len >= sizeof (struct ip6_hdr), 499120585Ssam ("first mbuf too short, len %u", m->m_len)); 500105197Ssam ip6 = mtod(m, struct ip6_hdr *); 501105197Ssam hlen = sizeof(struct ip6_hdr); 502105197Ssam if (m->m_len > hlen) { 503111119Simp MGETHDR(mh, M_DONTWAIT, MT_HEADER); 504105197Ssam if (!mh) { 505105197Ssam m_freem(m); 506105197Ssam return NULL; 507105197Ssam } 508108466Ssam M_MOVE_PKTHDR(mh, m); 509105197Ssam MH_ALIGN(mh, hlen); 510105197Ssam m->m_len -= hlen; 511105197Ssam m->m_data += hlen; 512105197Ssam mh->m_next = m; 513105197Ssam m = mh; 514105197Ssam m->m_len = hlen; 515105197Ssam bcopy((caddr_t)ip6, mtod(m, caddr_t), hlen); 516105197Ssam } else if (m->m_len < hlen) { 517105197Ssam m = m_pullup(m, hlen); 518105197Ssam if (!m) 519105197Ssam return NULL; 520105197Ssam } 521105197Ssam return m; 522105197Ssam} 523105197Ssam 524105197Ssam/* 525105197Ssam * IPsec output logic for IPv6, transport mode. 526105197Ssam */ 527105197Ssamint 528105197Ssamipsec6_output_trans( 529105197Ssam struct ipsec_output_state *state, 530105197Ssam u_char *nexthdrp, 531105197Ssam struct mbuf *mprev, 532105197Ssam struct secpolicy *sp, 533105197Ssam int flags, 534105197Ssam int *tun) 535105197Ssam{ 536105197Ssam struct ipsecrequest *isr; 537105197Ssam struct secasindex saidx; 538105197Ssam int error = 0; 539105197Ssam struct mbuf *m; 540105197Ssam 541120585Ssam IPSEC_ASSERT(state != NULL, ("null state")); 542120585Ssam IPSEC_ASSERT(state->m != NULL, ("null m")); 543120585Ssam IPSEC_ASSERT(nexthdrp != NULL, ("null nexthdrp")); 544120585Ssam IPSEC_ASSERT(mprev != NULL, ("null mprev")); 545120585Ssam IPSEC_ASSERT(sp != NULL, ("null sp")); 546120585Ssam IPSEC_ASSERT(tun != NULL, ("null tun")); 547105197Ssam 548105197Ssam KEYDEBUG(KEYDEBUG_IPSEC_DATA, 549120585Ssam printf("%s: applyed SP\n", __func__); 550105197Ssam kdebug_secpolicy(sp)); 551105197Ssam 552105197Ssam isr = sp->req; 553105197Ssam if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 554105197Ssam /* the rest will be handled by ipsec6_output_tunnel() */ 555105197Ssam *tun = 1; /* need tunnel-mode processing */ 556105197Ssam return 0; 557105197Ssam } 558105197Ssam 559105197Ssam *tun = 0; 560105197Ssam m = state->m; 561105197Ssam 562105197Ssam isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error); 563105197Ssam if (isr == NULL) { 564105197Ssam#ifdef notdef 565105197Ssam /* XXX should notification be done for all errors ? */ 566105197Ssam /* 567105197Ssam * Notify the fact that the packet is discarded 568105197Ssam * to ourselves. I believe this is better than 569105197Ssam * just silently discarding. (jinmei@kame.net) 570105197Ssam * XXX: should we restrict the error to TCP packets? 571105197Ssam * XXX: should we directly notify sockets via 572105197Ssam * pfctlinputs? 573105197Ssam */ 574105197Ssam icmp6_error(m, ICMP6_DST_UNREACH, 575105197Ssam ICMP6_DST_UNREACH_ADMIN, 0); 576105197Ssam m = NULL; /* NB: icmp6_error frees mbuf */ 577105197Ssam#endif 578105197Ssam goto bad; 579105197Ssam } 580105197Ssam 581105197Ssam return (*isr->sav->tdb_xform->xf_output)(m, isr, NULL, 582105197Ssam sizeof (struct ip6_hdr), 583105197Ssam offsetof(struct ip6_hdr, ip6_nxt)); 584105197Ssambad: 585105197Ssam if (m) 586105197Ssam m_freem(m); 587105197Ssam state->m = NULL; 588105197Ssam return error; 589105197Ssam} 590105197Ssam 591105197Ssamstatic int 592105197Ssamipsec6_encapsulate(struct mbuf *m, struct secasvar *sav) 593105197Ssam{ 594105197Ssam struct ip6_hdr *oip6; 595105197Ssam struct ip6_hdr *ip6; 596105197Ssam size_t plen; 597105197Ssam 598105197Ssam /* can't tunnel between different AFs */ 599105197Ssam if (sav->sah->saidx.src.sa.sa_family != AF_INET6 || 600105197Ssam sav->sah->saidx.dst.sa.sa_family != AF_INET6) { 601105197Ssam m_freem(m); 602105197Ssam return EINVAL; 603105197Ssam } 604120585Ssam IPSEC_ASSERT(m->m_len != sizeof (struct ip6_hdr), 605120585Ssam ("mbuf wrong size; len %u", m->m_len)); 606105197Ssam 607105197Ssam 608105197Ssam /* 609105197Ssam * grow the mbuf to accomodate the new IPv6 header. 610105197Ssam */ 611105197Ssam plen = m->m_pkthdr.len; 612105197Ssam if (M_LEADINGSPACE(m->m_next) < sizeof(struct ip6_hdr)) { 613105197Ssam struct mbuf *n; 614111119Simp MGET(n, M_DONTWAIT, MT_DATA); 615105197Ssam if (!n) { 616105197Ssam m_freem(m); 617105197Ssam return ENOBUFS; 618105197Ssam } 619105197Ssam n->m_len = sizeof(struct ip6_hdr); 620105197Ssam n->m_next = m->m_next; 621105197Ssam m->m_next = n; 622105197Ssam m->m_pkthdr.len += sizeof(struct ip6_hdr); 623105197Ssam oip6 = mtod(n, struct ip6_hdr *); 624105197Ssam } else { 625105197Ssam m->m_next->m_len += sizeof(struct ip6_hdr); 626105197Ssam m->m_next->m_data -= sizeof(struct ip6_hdr); 627105197Ssam m->m_pkthdr.len += sizeof(struct ip6_hdr); 628105197Ssam oip6 = mtod(m->m_next, struct ip6_hdr *); 629105197Ssam } 630105197Ssam ip6 = mtod(m, struct ip6_hdr *); 631113076Sdes bcopy((caddr_t)ip6, (caddr_t)oip6, sizeof(struct ip6_hdr)); 632105197Ssam 633105197Ssam /* Fake link-local scope-class addresses */ 634105197Ssam if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src)) 635105197Ssam oip6->ip6_src.s6_addr16[1] = 0; 636105197Ssam if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst)) 637105197Ssam oip6->ip6_dst.s6_addr16[1] = 0; 638105197Ssam 639105197Ssam /* construct new IPv6 header. see RFC 2401 5.1.2.2 */ 640105197Ssam /* ECN consideration. */ 641105197Ssam ip6_ecn_ingress(ip6_ipsec_ecn, &ip6->ip6_flow, &oip6->ip6_flow); 642105197Ssam if (plen < IPV6_MAXPACKET - sizeof(struct ip6_hdr)) 643105197Ssam ip6->ip6_plen = htons(plen); 644105197Ssam else { 645105197Ssam /* ip6->ip6_plen will be updated in ip6_output() */ 646105197Ssam } 647105197Ssam ip6->ip6_nxt = IPPROTO_IPV6; 648105197Ssam sav->sah->saidx.src.sin6.sin6_addr = ip6->ip6_src; 649105197Ssam sav->sah->saidx.dst.sin6.sin6_addr = ip6->ip6_dst; 650105197Ssam ip6->ip6_hlim = IPV6_DEFHLIM; 651105197Ssam 652105197Ssam /* XXX Should ip6_src be updated later ? */ 653105197Ssam 654105197Ssam return 0; 655105197Ssam} 656105197Ssam 657105197Ssam/* 658105197Ssam * IPsec output logic for IPv6, tunnel mode. 659105197Ssam */ 660105197Ssamint 661105197Ssamipsec6_output_tunnel(struct ipsec_output_state *state, struct secpolicy *sp, int flags) 662105197Ssam{ 663105197Ssam struct ip6_hdr *ip6; 664105197Ssam struct ipsecrequest *isr; 665105197Ssam struct secasindex saidx; 666105197Ssam int error; 667105197Ssam struct sockaddr_in6* dst6; 668105197Ssam struct mbuf *m; 669105197Ssam 670120585Ssam IPSEC_ASSERT(state != NULL, ("null state")); 671120585Ssam IPSEC_ASSERT(state->m != NULL, ("null m")); 672120585Ssam IPSEC_ASSERT(sp != NULL, ("null sp")); 673105197Ssam 674105197Ssam KEYDEBUG(KEYDEBUG_IPSEC_DATA, 675120585Ssam printf("%s: applyed SP\n", __func__); 676105197Ssam kdebug_secpolicy(sp)); 677105197Ssam 678105197Ssam m = state->m; 679105197Ssam /* 680105197Ssam * transport mode ipsec (before the 1st tunnel mode) is already 681105197Ssam * processed by ipsec6_output_trans(). 682105197Ssam */ 683105197Ssam for (isr = sp->req; isr; isr = isr->next) { 684105197Ssam if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 685105197Ssam break; 686105197Ssam } 687105197Ssam isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error); 688105197Ssam if (isr == NULL) 689105197Ssam goto bad; 690105197Ssam 691105197Ssam /* 692105197Ssam * There may be the case that SA status will be changed when 693105197Ssam * we are refering to one. So calling splsoftnet(). 694105197Ssam */ 695105197Ssam if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 696105197Ssam /* 697105197Ssam * build IPsec tunnel. 698105197Ssam */ 699105197Ssam /* XXX should be processed with other familiy */ 700105197Ssam if (isr->sav->sah->saidx.src.sa.sa_family != AF_INET6) { 701120585Ssam ipseclog((LOG_ERR, "%s: family mismatched between " 702120585Ssam "inner and outer, spi=%u\n", __func__, 703105197Ssam ntohl(isr->sav->spi))); 704105197Ssam newipsecstat.ips_out_inval++; 705105197Ssam error = EAFNOSUPPORT; 706105197Ssam goto bad; 707105197Ssam } 708105197Ssam 709105197Ssam m = ipsec6_splithdr(m); 710105197Ssam if (!m) { 711105197Ssam newipsecstat.ips_out_nomem++; 712105197Ssam error = ENOMEM; 713105197Ssam goto bad; 714105197Ssam } 715105197Ssam error = ipsec6_encapsulate(m, isr->sav); 716105197Ssam if (error) { 717105197Ssam m = NULL; 718105197Ssam goto bad; 719105197Ssam } 720105197Ssam ip6 = mtod(m, struct ip6_hdr *); 721105197Ssam 722105197Ssam state->ro = &isr->sav->sah->sa_route; 723105197Ssam state->dst = (struct sockaddr *)&state->ro->ro_dst; 724105197Ssam dst6 = (struct sockaddr_in6 *)state->dst; 725105197Ssam if (state->ro->ro_rt 726105197Ssam && ((state->ro->ro_rt->rt_flags & RTF_UP) == 0 727105197Ssam || !IN6_ARE_ADDR_EQUAL(&dst6->sin6_addr, &ip6->ip6_dst))) { 728105197Ssam RTFREE(state->ro->ro_rt); 729105197Ssam state->ro->ro_rt = NULL; 730105197Ssam } 731105197Ssam if (state->ro->ro_rt == 0) { 732105197Ssam bzero(dst6, sizeof(*dst6)); 733105197Ssam dst6->sin6_family = AF_INET6; 734105197Ssam dst6->sin6_len = sizeof(*dst6); 735105197Ssam dst6->sin6_addr = ip6->ip6_dst; 736105197Ssam rtalloc(state->ro); 737105197Ssam } 738105197Ssam if (state->ro->ro_rt == 0) { 739105197Ssam ip6stat.ip6s_noroute++; 740105197Ssam newipsecstat.ips_out_noroute++; 741105197Ssam error = EHOSTUNREACH; 742105197Ssam goto bad; 743105197Ssam } 744105197Ssam 745105197Ssam /* adjust state->dst if tunnel endpoint is offlink */ 746105197Ssam if (state->ro->ro_rt->rt_flags & RTF_GATEWAY) { 747105197Ssam state->dst = (struct sockaddr *)state->ro->ro_rt->rt_gateway; 748105197Ssam dst6 = (struct sockaddr_in6 *)state->dst; 749105197Ssam } 750105197Ssam } 751105197Ssam 752105197Ssam m = ipsec6_splithdr(m); 753105197Ssam if (!m) { 754105197Ssam newipsecstat.ips_out_nomem++; 755105197Ssam error = ENOMEM; 756105197Ssam goto bad; 757105197Ssam } 758105197Ssam ip6 = mtod(m, struct ip6_hdr *); 759105197Ssam return (*isr->sav->tdb_xform->xf_output)(m, isr, NULL, 760105197Ssam sizeof (struct ip6_hdr), 761105197Ssam offsetof(struct ip6_hdr, ip6_nxt)); 762105197Ssambad: 763105197Ssam if (m) 764105197Ssam m_freem(m); 765105197Ssam state->m = NULL; 766105197Ssam return error; 767105197Ssam} 768105197Ssam#endif /*INET6*/ 769