ipsec_output.c revision 112758
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 112758 2003-03-28 20:28:05Z 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 92105197Ssam#if 0 93105197Ssam SPLASSERT(net, "ipsec_process_done"); 94105197Ssam#endif 95105197Ssam 96105197Ssam KASSERT(m != NULL, ("ipsec_process_done: null mbuf")); 97105197Ssam KASSERT(isr != NULL, ("ipsec_process_done: null ISR")); 98105197Ssam sav = isr->sav; 99105197Ssam KASSERT(sav != NULL, ("ipsec_process_done: null SA")); 100105197Ssam KASSERT(sav->sah != NULL, ("ipsec_process_done: null SAH")); 101105197Ssam 102105197Ssam saidx = &sav->sah->saidx; 103105197Ssam switch (saidx->dst.sa.sa_family) { 104105197Ssam#ifdef INET 105105197Ssam case AF_INET: 106105197Ssam /* Fix the header length, for AH processing. */ 107105197Ssam mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len); 108105197Ssam break; 109105197Ssam#endif /* INET */ 110105197Ssam#ifdef INET6 111105197Ssam case AF_INET6: 112105197Ssam /* Fix the header length, for AH processing. */ 113105197Ssam if (m->m_pkthdr.len < sizeof (struct ip6_hdr)) { 114105197Ssam error = ENXIO; 115105197Ssam goto bad; 116105197Ssam } 117105197Ssam if (m->m_pkthdr.len - sizeof (struct ip6_hdr) > IPV6_MAXPACKET) { 118105197Ssam /* No jumbogram support. */ 119105197Ssam error = ENXIO; /*?*/ 120105197Ssam goto bad; 121105197Ssam } 122105197Ssam mtod(m, struct ip6_hdr *)->ip6_plen = 123105197Ssam htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 124105197Ssam break; 125105197Ssam#endif /* INET6 */ 126105197Ssam default: 127105197Ssam DPRINTF(("ipsec_process_done: unknown protocol family %u\n", 128105197Ssam saidx->dst.sa.sa_family)); 129105197Ssam error = ENXIO; 130105197Ssam goto bad; 131105197Ssam } 132105197Ssam 133105197Ssam /* 134105197Ssam * Add a record of what we've done or what needs to be done to the 135105197Ssam * packet. 136105197Ssam */ 137105197Ssam mtag = m_tag_get(PACKET_TAG_IPSEC_OUT_DONE, 138105197Ssam sizeof(struct tdb_ident), M_NOWAIT); 139105197Ssam if (mtag == NULL) { 140105197Ssam DPRINTF(("ipsec_process_done: could not get packet tag\n")); 141105197Ssam error = ENOMEM; 142105197Ssam goto bad; 143105197Ssam } 144105197Ssam 145105197Ssam tdbi = (struct tdb_ident *)(mtag + 1); 146105197Ssam tdbi->dst = saidx->dst; 147105197Ssam tdbi->proto = saidx->proto; 148105197Ssam tdbi->spi = sav->spi; 149105197Ssam m_tag_prepend(m, mtag); 150105197Ssam 151105197Ssam /* 152105197Ssam * If there's another (bundled) SA to apply, do so. 153105197Ssam * Note that this puts a burden on the kernel stack size. 154105197Ssam * If this is a problem we'll need to introduce a queue 155105197Ssam * to set the packet on so we can unwind the stack before 156105197Ssam * doing further processing. 157105197Ssam */ 158105197Ssam if (isr->next) { 159105197Ssam newipsecstat.ips_out_bundlesa++; 160105197Ssam return ipsec4_process_packet(m, isr->next, 0, 0); 161105197Ssam } 162105197Ssam 163105197Ssam /* 164105197Ssam * We're done with IPsec processing, transmit the packet using the 165105197Ssam * appropriate network protocol (IP or IPv6). SPD lookup will be 166105197Ssam * performed again there. 167105197Ssam */ 168105197Ssam switch (saidx->dst.sa.sa_family) { 169105197Ssam#ifdef INET 170105197Ssam struct ip *ip; 171105197Ssam case AF_INET: 172105197Ssam ip = mtod(m, struct ip *); 173105197Ssam ip->ip_len = ntohs(ip->ip_len); 174105197Ssam ip->ip_off = ntohs(ip->ip_off); 175105197Ssam 176105197Ssam return ip_output(m, NULL, NULL, IP_RAWOUTPUT, NULL, NULL); 177105197Ssam#endif /* INET */ 178105197Ssam#ifdef INET6 179105197Ssam case AF_INET6: 180105197Ssam /* 181105197Ssam * We don't need massage, IPv6 header fields are always in 182105197Ssam * net endian. 183105197Ssam */ 184105197Ssam return ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL); 185105197Ssam#endif /* INET6 */ 186105197Ssam } 187105197Ssam panic("ipsec_process_done"); 188105197Ssambad: 189105197Ssam m_freem(m); 190105197Ssam KEY_FREESAV(&sav); 191105197Ssam return (error); 192105197Ssam} 193105197Ssam 194105197Ssamstatic struct ipsecrequest * 195105197Ssamipsec_nextisr( 196105197Ssam struct mbuf *m, 197105197Ssam struct ipsecrequest *isr, 198105197Ssam int af, 199105197Ssam struct secasindex *saidx, 200105197Ssam int *error 201105197Ssam) 202105197Ssam{ 203105197Ssam#define IPSEC_OSTAT(x,y,z) (isr->saidx.proto == IPPROTO_ESP ? (x)++ : \ 204105197Ssam isr->saidx.proto == IPPROTO_AH ? (y)++ : (z)++) 205105197Ssam struct secasvar *sav; 206105197Ssam 207105197Ssam#if 0 208105197Ssam SPLASSERT(net, "ipsec_nextisr"); 209105197Ssam#endif 210105197Ssam KASSERT(af == AF_INET || af == AF_INET6, 211105197Ssam ("ipsec_nextisr: invalid address family %u", af)); 212105197Ssamagain: 213105197Ssam /* 214105197Ssam * Craft SA index to search for proper SA. Note that 215105197Ssam * we only fillin unspecified SA peers for transport 216105197Ssam * mode; for tunnel mode they must already be filled in. 217105197Ssam */ 218105197Ssam *saidx = isr->saidx; 219105197Ssam if (isr->saidx.mode == IPSEC_MODE_TRANSPORT) { 220105197Ssam /* Fillin unspecified SA peers only for transport mode */ 221105197Ssam if (af == AF_INET) { 222105197Ssam struct sockaddr_in *sin; 223105197Ssam struct ip *ip = mtod(m, struct ip *); 224105197Ssam 225105197Ssam if (saidx->src.sa.sa_len == 0) { 226105197Ssam sin = &saidx->src.sin; 227105197Ssam sin->sin_len = sizeof(*sin); 228105197Ssam sin->sin_family = AF_INET; 229105197Ssam sin->sin_port = IPSEC_PORT_ANY; 230105197Ssam sin->sin_addr = ip->ip_src; 231105197Ssam } 232105197Ssam if (saidx->dst.sa.sa_len == 0) { 233105197Ssam sin = &saidx->dst.sin; 234105197Ssam sin->sin_len = sizeof(*sin); 235105197Ssam sin->sin_family = AF_INET; 236105197Ssam sin->sin_port = IPSEC_PORT_ANY; 237105197Ssam sin->sin_addr = ip->ip_dst; 238105197Ssam } 239105197Ssam } else { 240105197Ssam struct sockaddr_in6 *sin6; 241105197Ssam struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 242105197Ssam 243105197Ssam if (saidx->src.sin6.sin6_len == 0) { 244105197Ssam sin6 = (struct sockaddr_in6 *)&saidx->src; 245105197Ssam sin6->sin6_len = sizeof(*sin6); 246105197Ssam sin6->sin6_family = AF_INET6; 247105197Ssam sin6->sin6_port = IPSEC_PORT_ANY; 248105197Ssam sin6->sin6_addr = ip6->ip6_src; 249105197Ssam if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 250105197Ssam /* fix scope id for comparing SPD */ 251105197Ssam sin6->sin6_addr.s6_addr16[1] = 0; 252105197Ssam sin6->sin6_scope_id = 253105197Ssam ntohs(ip6->ip6_src.s6_addr16[1]); 254105197Ssam } 255105197Ssam } 256105197Ssam if (saidx->dst.sin6.sin6_len == 0) { 257105197Ssam sin6 = (struct sockaddr_in6 *)&saidx->dst; 258105197Ssam sin6->sin6_len = sizeof(*sin6); 259105197Ssam sin6->sin6_family = AF_INET6; 260105197Ssam sin6->sin6_port = IPSEC_PORT_ANY; 261105197Ssam sin6->sin6_addr = ip6->ip6_dst; 262105197Ssam if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 263105197Ssam /* fix scope id for comparing SPD */ 264105197Ssam sin6->sin6_addr.s6_addr16[1] = 0; 265105197Ssam sin6->sin6_scope_id = 266105197Ssam ntohs(ip6->ip6_dst.s6_addr16[1]); 267105197Ssam } 268105197Ssam } 269105197Ssam } 270105197Ssam } 271105197Ssam 272105197Ssam /* 273105197Ssam * Lookup SA and validate it. 274105197Ssam */ 275105197Ssam *error = key_checkrequest(isr, saidx); 276105197Ssam if (*error != 0) { 277105197Ssam /* 278105197Ssam * IPsec processing is required, but no SA found. 279105197Ssam * I assume that key_acquire() had been called 280105197Ssam * to get/establish the SA. Here I discard 281105197Ssam * this packet because it is responsibility for 282105197Ssam * upper layer to retransmit the packet. 283105197Ssam */ 284105197Ssam newipsecstat.ips_out_nosa++; 285105197Ssam goto bad; 286105197Ssam } 287105197Ssam sav = isr->sav; 288105197Ssam if (sav == NULL) { /* XXX valid return */ 289105197Ssam KASSERT(ipsec_get_reqlevel(isr) == IPSEC_LEVEL_USE, 290105197Ssam ("ipsec_nextisr: no SA found, but required; level %u", 291105197Ssam ipsec_get_reqlevel(isr))); 292105197Ssam isr = isr->next; 293105197Ssam if (isr == NULL) { 294105197Ssam /*XXXstatistic??*/ 295105197Ssam *error = EINVAL; /*XXX*/ 296105197Ssam return isr; 297105197Ssam } 298105197Ssam goto again; 299105197Ssam } 300105197Ssam 301105197Ssam /* 302105197Ssam * Check system global policy controls. 303105197Ssam */ 304105197Ssam if ((isr->saidx.proto == IPPROTO_ESP && !esp_enable) || 305105197Ssam (isr->saidx.proto == IPPROTO_AH && !ah_enable) || 306105197Ssam (isr->saidx.proto == IPPROTO_IPCOMP && !ipcomp_enable)) { 307105197Ssam DPRINTF(("ipsec_nextisr: IPsec outbound packet dropped due" 308105197Ssam " to policy (check your sysctls)\n")); 309105197Ssam IPSEC_OSTAT(espstat.esps_pdrops, ahstat.ahs_pdrops, 310105197Ssam ipcompstat.ipcomps_pdrops); 311105197Ssam *error = EHOSTUNREACH; 312105197Ssam goto bad; 313105197Ssam } 314105197Ssam 315105197Ssam /* 316105197Ssam * Sanity check the SA contents for the caller 317105197Ssam * before they invoke the xform output method. 318105197Ssam */ 319105197Ssam if (sav->tdb_xform == NULL) { 320105197Ssam DPRINTF(("ipsec_nextisr: no transform for SA\n")); 321105197Ssam IPSEC_OSTAT(espstat.esps_noxform, ahstat.ahs_noxform, 322105197Ssam ipcompstat.ipcomps_noxform); 323105197Ssam *error = EHOSTUNREACH; 324105197Ssam goto bad; 325105197Ssam } 326105197Ssam return isr; 327105197Ssambad: 328105197Ssam KASSERT(*error != 0, ("ipsec_nextisr: error return w/ no error code")); 329105197Ssam return NULL; 330105197Ssam#undef IPSEC_OSTAT 331105197Ssam} 332105197Ssam 333105197Ssam#ifdef INET 334105197Ssam/* 335105197Ssam * IPsec output logic for IPv4. 336105197Ssam */ 337105197Ssamint 338105197Ssamipsec4_process_packet( 339105197Ssam struct mbuf *m, 340105197Ssam struct ipsecrequest *isr, 341105197Ssam int flags, 342105197Ssam int tunalready) 343105197Ssam{ 344105197Ssam struct secasindex saidx; 345105197Ssam struct secasvar *sav; 346105197Ssam struct ip *ip; 347105197Ssam int s, error, i, off; 348105197Ssam 349105197Ssam KASSERT(m != NULL, ("ipsec4_process_packet: null mbuf")); 350105197Ssam KASSERT(isr != NULL, ("ipsec4_process_packet: null isr")); 351105197Ssam 352105197Ssam s = splnet(); /* insure SA contents don't change */ 353105197Ssam 354105197Ssam isr = ipsec_nextisr(m, isr, AF_INET, &saidx, &error); 355105197Ssam if (isr == NULL) 356105197Ssam goto bad; 357105197Ssam 358105197Ssam sav = isr->sav; 359105197Ssam if (!tunalready) { 360105197Ssam union sockaddr_union *dst = &sav->sah->saidx.dst; 361105197Ssam int setdf; 362105197Ssam 363105197Ssam /* 364105197Ssam * Collect IP_DF state from the outer header. 365105197Ssam */ 366105197Ssam if (dst->sa.sa_family == AF_INET) { 367105197Ssam if (m->m_len < sizeof (struct ip) && 368105197Ssam (m = m_pullup(m, sizeof (struct ip))) == NULL) { 369105197Ssam error = ENOBUFS; 370105197Ssam goto bad; 371105197Ssam } 372105197Ssam ip = mtod(m, struct ip *); 373105197Ssam /* Honor system-wide control of how to handle IP_DF */ 374105197Ssam switch (ip4_ipsec_dfbit) { 375105197Ssam case 0: /* clear in outer header */ 376105197Ssam case 1: /* set in outer header */ 377105197Ssam setdf = ip4_ipsec_dfbit; 378105197Ssam break; 379105197Ssam default: /* propagate to outer header */ 380105197Ssam setdf = ntohs(ip->ip_off & IP_DF); 381105197Ssam break; 382105197Ssam } 383105197Ssam } else { 384105197Ssam ip = NULL; /* keep compiler happy */ 385105197Ssam setdf = 0; 386105197Ssam } 387105197Ssam /* Do the appropriate encapsulation, if necessary */ 388105197Ssam if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */ 389105197Ssam dst->sa.sa_family != AF_INET || /* PF mismatch */ 390105197Ssam#if 0 391105197Ssam (sav->flags & SADB_X_SAFLAGS_TUNNEL) || /* Tunnel requ'd */ 392105197Ssam sav->tdb_xform->xf_type == XF_IP4 || /* ditto */ 393105197Ssam#endif 394105197Ssam (dst->sa.sa_family == AF_INET && /* Proxy */ 395105197Ssam dst->sin.sin_addr.s_addr != INADDR_ANY && 396105197Ssam dst->sin.sin_addr.s_addr != ip->ip_dst.s_addr)) { 397105197Ssam struct mbuf *mp; 398105197Ssam 399105197Ssam /* Fix IPv4 header checksum and length */ 400105197Ssam if (m->m_len < sizeof (struct ip) && 401105197Ssam (m = m_pullup(m, sizeof (struct ip))) == NULL) { 402105197Ssam error = ENOBUFS; 403105197Ssam goto bad; 404105197Ssam } 405105197Ssam ip = mtod(m, struct ip *); 406105197Ssam ip->ip_len = htons(m->m_pkthdr.len); 407105197Ssam ip->ip_sum = 0; 408105197Ssam#ifdef _IP_VHL 409105197Ssam if (ip->ip_vhl == IP_VHL_BORING) 410105197Ssam ip->ip_sum = in_cksum_hdr(ip); 411105197Ssam else 412105197Ssam ip->ip_sum = in_cksum(m, 413105197Ssam _IP_VHL_HL(ip->ip_vhl) << 2); 414105197Ssam#else 415105197Ssam ip->ip_sum = in_cksum(m, ip->ip_hl << 2); 416105197Ssam#endif 417105197Ssam 418105197Ssam /* Encapsulate the packet */ 419105197Ssam error = ipip_output(m, isr, &mp, 0, 0); 420105197Ssam if (mp == NULL && !error) { 421105197Ssam /* Should never happen. */ 422105197Ssam DPRINTF(("ipsec4_process_packet: ipip_output " 423105197Ssam "returns no mbuf and no error!")); 424105197Ssam error = EFAULT; 425105197Ssam } 426105197Ssam if (error) { 427105197Ssam if (mp) 428105197Ssam m_freem(mp); 429105197Ssam goto bad; 430105197Ssam } 431105197Ssam m = mp, mp = NULL; 432105197Ssam /* 433105197Ssam * ipip_output clears IP_DF in the new header. If 434105197Ssam * we need to propagate IP_DF from the outer header, 435105197Ssam * then we have to do it here. 436105197Ssam * 437105197Ssam * XXX shouldn't assume what ipip_output does. 438105197Ssam */ 439105197Ssam if (dst->sa.sa_family == AF_INET && setdf) { 440105197Ssam if (m->m_len < sizeof (struct ip) && 441105197Ssam (m = m_pullup(m, sizeof (struct ip))) == NULL) { 442105197Ssam error = ENOBUFS; 443105197Ssam goto bad; 444105197Ssam } 445105197Ssam ip = mtod(m, struct ip *); 446105197Ssam ip->ip_off = ntohs(ip->ip_off); 447105197Ssam ip->ip_off |= IP_DF; 448105197Ssam ip->ip_off = htons(ip->ip_off); 449105197Ssam } 450105197Ssam } 451105197Ssam } 452105197Ssam 453105197Ssam /* 454105197Ssam * Dispatch to the appropriate IPsec transform logic. The 455105197Ssam * packet will be returned for transmission after crypto 456105197Ssam * processing, etc. are completed. For encapsulation we 457105197Ssam * bypass this call because of the explicit call done above 458105197Ssam * (necessary to deal with IP_DF handling for IPv4). 459105197Ssam * 460105197Ssam * NB: m & sav are ``passed to caller'' who's reponsible for 461105197Ssam * for reclaiming their resources. 462105197Ssam */ 463105197Ssam if (sav->tdb_xform->xf_type != XF_IP4) { 464105197Ssam ip = mtod(m, struct ip *); 465105197Ssam i = ip->ip_hl << 2; 466105197Ssam off = offsetof(struct ip, ip_p); 467105197Ssam error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off); 468105197Ssam } else { 469105197Ssam error = ipsec_process_done(m, isr); 470105197Ssam } 471105197Ssam splx(s); 472105197Ssam return error; 473105197Ssambad: 474105197Ssam splx(s); 475105197Ssam if (m) 476105197Ssam m_freem(m); 477105197Ssam return error; 478105197Ssam} 479105197Ssam#endif 480105197Ssam 481105197Ssam#ifdef INET6 482105197Ssam/* 483105197Ssam * Chop IP6 header from the payload. 484105197Ssam */ 485105197Ssamstatic struct mbuf * 486105197Ssamipsec6_splithdr(struct mbuf *m) 487105197Ssam{ 488105197Ssam struct mbuf *mh; 489105197Ssam struct ip6_hdr *ip6; 490105197Ssam int hlen; 491105197Ssam 492105197Ssam KASSERT(m->m_len >= sizeof (struct ip6_hdr), 493105197Ssam ("ipsec6_splithdr: first mbuf too short, len %u", m->m_len)); 494105197Ssam ip6 = mtod(m, struct ip6_hdr *); 495105197Ssam hlen = sizeof(struct ip6_hdr); 496105197Ssam if (m->m_len > hlen) { 497111119Simp MGETHDR(mh, M_DONTWAIT, MT_HEADER); 498105197Ssam if (!mh) { 499105197Ssam m_freem(m); 500105197Ssam return NULL; 501105197Ssam } 502108466Ssam M_MOVE_PKTHDR(mh, m); 503105197Ssam MH_ALIGN(mh, hlen); 504105197Ssam m->m_len -= hlen; 505105197Ssam m->m_data += hlen; 506105197Ssam mh->m_next = m; 507105197Ssam m = mh; 508105197Ssam m->m_len = hlen; 509105197Ssam bcopy((caddr_t)ip6, mtod(m, caddr_t), hlen); 510105197Ssam } else if (m->m_len < hlen) { 511105197Ssam m = m_pullup(m, hlen); 512105197Ssam if (!m) 513105197Ssam return NULL; 514105197Ssam } 515105197Ssam return m; 516105197Ssam} 517105197Ssam 518105197Ssam/* 519105197Ssam * IPsec output logic for IPv6, transport mode. 520105197Ssam */ 521105197Ssamint 522105197Ssamipsec6_output_trans( 523105197Ssam struct ipsec_output_state *state, 524105197Ssam u_char *nexthdrp, 525105197Ssam struct mbuf *mprev, 526105197Ssam struct secpolicy *sp, 527105197Ssam int flags, 528105197Ssam int *tun) 529105197Ssam{ 530105197Ssam struct ipsecrequest *isr; 531105197Ssam struct secasindex saidx; 532105197Ssam int error = 0; 533105197Ssam struct mbuf *m; 534105197Ssam 535105197Ssam KASSERT(state != NULL, ("ipsec6_output: null state")); 536105197Ssam KASSERT(state->m != NULL, ("ipsec6_output: null m")); 537105197Ssam KASSERT(nexthdrp != NULL, ("ipsec6_output: null nexthdrp")); 538105197Ssam KASSERT(mprev != NULL, ("ipsec6_output: null mprev")); 539105197Ssam KASSERT(sp != NULL, ("ipsec6_output: null sp")); 540105197Ssam KASSERT(tun != NULL, ("ipsec6_output: null tun")); 541105197Ssam 542105197Ssam KEYDEBUG(KEYDEBUG_IPSEC_DATA, 543105197Ssam printf("ipsec6_output_trans: applyed SP\n"); 544105197Ssam kdebug_secpolicy(sp)); 545105197Ssam 546105197Ssam isr = sp->req; 547105197Ssam if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 548105197Ssam /* the rest will be handled by ipsec6_output_tunnel() */ 549105197Ssam *tun = 1; /* need tunnel-mode processing */ 550105197Ssam return 0; 551105197Ssam } 552105197Ssam 553105197Ssam *tun = 0; 554105197Ssam m = state->m; 555105197Ssam 556105197Ssam isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error); 557105197Ssam if (isr == NULL) { 558105197Ssam#ifdef notdef 559105197Ssam /* XXX should notification be done for all errors ? */ 560105197Ssam /* 561105197Ssam * Notify the fact that the packet is discarded 562105197Ssam * to ourselves. I believe this is better than 563105197Ssam * just silently discarding. (jinmei@kame.net) 564105197Ssam * XXX: should we restrict the error to TCP packets? 565105197Ssam * XXX: should we directly notify sockets via 566105197Ssam * pfctlinputs? 567105197Ssam */ 568105197Ssam icmp6_error(m, ICMP6_DST_UNREACH, 569105197Ssam ICMP6_DST_UNREACH_ADMIN, 0); 570105197Ssam m = NULL; /* NB: icmp6_error frees mbuf */ 571105197Ssam#endif 572105197Ssam goto bad; 573105197Ssam } 574105197Ssam 575105197Ssam return (*isr->sav->tdb_xform->xf_output)(m, isr, NULL, 576105197Ssam sizeof (struct ip6_hdr), 577105197Ssam offsetof(struct ip6_hdr, ip6_nxt)); 578105197Ssambad: 579105197Ssam if (m) 580105197Ssam m_freem(m); 581105197Ssam state->m = NULL; 582105197Ssam return error; 583105197Ssam} 584105197Ssam 585105197Ssamstatic int 586105197Ssamipsec6_encapsulate(struct mbuf *m, struct secasvar *sav) 587105197Ssam{ 588105197Ssam struct ip6_hdr *oip6; 589105197Ssam struct ip6_hdr *ip6; 590105197Ssam size_t plen; 591105197Ssam 592105197Ssam /* can't tunnel between different AFs */ 593105197Ssam if (sav->sah->saidx.src.sa.sa_family != AF_INET6 || 594105197Ssam sav->sah->saidx.dst.sa.sa_family != AF_INET6) { 595105197Ssam m_freem(m); 596105197Ssam return EINVAL; 597105197Ssam } 598105197Ssam KASSERT(m->m_len != sizeof (struct ip6_hdr), 599105197Ssam ("ipsec6_encapsulate: mbuf wrong size; len %u", m->m_len)); 600105197Ssam 601105197Ssam 602105197Ssam /* 603105197Ssam * grow the mbuf to accomodate the new IPv6 header. 604105197Ssam */ 605105197Ssam plen = m->m_pkthdr.len; 606105197Ssam if (M_LEADINGSPACE(m->m_next) < sizeof(struct ip6_hdr)) { 607105197Ssam struct mbuf *n; 608111119Simp MGET(n, M_DONTWAIT, MT_DATA); 609105197Ssam if (!n) { 610105197Ssam m_freem(m); 611105197Ssam return ENOBUFS; 612105197Ssam } 613105197Ssam n->m_len = sizeof(struct ip6_hdr); 614105197Ssam n->m_next = m->m_next; 615105197Ssam m->m_next = n; 616105197Ssam m->m_pkthdr.len += sizeof(struct ip6_hdr); 617105197Ssam oip6 = mtod(n, struct ip6_hdr *); 618105197Ssam } else { 619105197Ssam m->m_next->m_len += sizeof(struct ip6_hdr); 620105197Ssam m->m_next->m_data -= sizeof(struct ip6_hdr); 621105197Ssam m->m_pkthdr.len += sizeof(struct ip6_hdr); 622105197Ssam oip6 = mtod(m->m_next, struct ip6_hdr *); 623105197Ssam } 624105197Ssam ip6 = mtod(m, struct ip6_hdr *); 625105197Ssam ovbcopy((caddr_t)ip6, (caddr_t)oip6, sizeof(struct ip6_hdr)); 626105197Ssam 627105197Ssam /* Fake link-local scope-class addresses */ 628105197Ssam if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src)) 629105197Ssam oip6->ip6_src.s6_addr16[1] = 0; 630105197Ssam if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst)) 631105197Ssam oip6->ip6_dst.s6_addr16[1] = 0; 632105197Ssam 633105197Ssam /* construct new IPv6 header. see RFC 2401 5.1.2.2 */ 634105197Ssam /* ECN consideration. */ 635105197Ssam ip6_ecn_ingress(ip6_ipsec_ecn, &ip6->ip6_flow, &oip6->ip6_flow); 636105197Ssam if (plen < IPV6_MAXPACKET - sizeof(struct ip6_hdr)) 637105197Ssam ip6->ip6_plen = htons(plen); 638105197Ssam else { 639105197Ssam /* ip6->ip6_plen will be updated in ip6_output() */ 640105197Ssam } 641105197Ssam ip6->ip6_nxt = IPPROTO_IPV6; 642105197Ssam sav->sah->saidx.src.sin6.sin6_addr = ip6->ip6_src; 643105197Ssam sav->sah->saidx.dst.sin6.sin6_addr = ip6->ip6_dst; 644105197Ssam ip6->ip6_hlim = IPV6_DEFHLIM; 645105197Ssam 646105197Ssam /* XXX Should ip6_src be updated later ? */ 647105197Ssam 648105197Ssam return 0; 649105197Ssam} 650105197Ssam 651105197Ssam/* 652105197Ssam * IPsec output logic for IPv6, tunnel mode. 653105197Ssam */ 654105197Ssamint 655105197Ssamipsec6_output_tunnel(struct ipsec_output_state *state, struct secpolicy *sp, int flags) 656105197Ssam{ 657105197Ssam struct ip6_hdr *ip6; 658105197Ssam struct ipsecrequest *isr; 659105197Ssam struct secasindex saidx; 660105197Ssam int error; 661105197Ssam struct sockaddr_in6* dst6; 662105197Ssam struct mbuf *m; 663105197Ssam 664105197Ssam KASSERT(state != NULL, ("ipsec6_output: null state")); 665105197Ssam KASSERT(state->m != NULL, ("ipsec6_output: null m")); 666105197Ssam KASSERT(sp != NULL, ("ipsec6_output: null sp")); 667105197Ssam 668105197Ssam KEYDEBUG(KEYDEBUG_IPSEC_DATA, 669105197Ssam printf("ipsec6_output_tunnel: applyed SP\n"); 670105197Ssam kdebug_secpolicy(sp)); 671105197Ssam 672105197Ssam m = state->m; 673105197Ssam /* 674105197Ssam * transport mode ipsec (before the 1st tunnel mode) is already 675105197Ssam * processed by ipsec6_output_trans(). 676105197Ssam */ 677105197Ssam for (isr = sp->req; isr; isr = isr->next) { 678105197Ssam if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 679105197Ssam break; 680105197Ssam } 681105197Ssam isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error); 682105197Ssam if (isr == NULL) 683105197Ssam goto bad; 684105197Ssam 685105197Ssam /* 686105197Ssam * There may be the case that SA status will be changed when 687105197Ssam * we are refering to one. So calling splsoftnet(). 688105197Ssam */ 689105197Ssam if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 690105197Ssam /* 691105197Ssam * build IPsec tunnel. 692105197Ssam */ 693105197Ssam /* XXX should be processed with other familiy */ 694105197Ssam if (isr->sav->sah->saidx.src.sa.sa_family != AF_INET6) { 695105197Ssam ipseclog((LOG_ERR, "ipsec6_output_tunnel: " 696105197Ssam "family mismatched between inner and outer, spi=%u\n", 697105197Ssam ntohl(isr->sav->spi))); 698105197Ssam newipsecstat.ips_out_inval++; 699105197Ssam error = EAFNOSUPPORT; 700105197Ssam goto bad; 701105197Ssam } 702105197Ssam 703105197Ssam m = ipsec6_splithdr(m); 704105197Ssam if (!m) { 705105197Ssam newipsecstat.ips_out_nomem++; 706105197Ssam error = ENOMEM; 707105197Ssam goto bad; 708105197Ssam } 709105197Ssam error = ipsec6_encapsulate(m, isr->sav); 710105197Ssam if (error) { 711105197Ssam m = NULL; 712105197Ssam goto bad; 713105197Ssam } 714105197Ssam ip6 = mtod(m, struct ip6_hdr *); 715105197Ssam 716105197Ssam state->ro = &isr->sav->sah->sa_route; 717105197Ssam state->dst = (struct sockaddr *)&state->ro->ro_dst; 718105197Ssam dst6 = (struct sockaddr_in6 *)state->dst; 719105197Ssam if (state->ro->ro_rt 720105197Ssam && ((state->ro->ro_rt->rt_flags & RTF_UP) == 0 721105197Ssam || !IN6_ARE_ADDR_EQUAL(&dst6->sin6_addr, &ip6->ip6_dst))) { 722105197Ssam RTFREE(state->ro->ro_rt); 723105197Ssam state->ro->ro_rt = NULL; 724105197Ssam } 725105197Ssam if (state->ro->ro_rt == 0) { 726105197Ssam bzero(dst6, sizeof(*dst6)); 727105197Ssam dst6->sin6_family = AF_INET6; 728105197Ssam dst6->sin6_len = sizeof(*dst6); 729105197Ssam dst6->sin6_addr = ip6->ip6_dst; 730105197Ssam rtalloc(state->ro); 731105197Ssam } 732105197Ssam if (state->ro->ro_rt == 0) { 733105197Ssam ip6stat.ip6s_noroute++; 734105197Ssam newipsecstat.ips_out_noroute++; 735105197Ssam error = EHOSTUNREACH; 736105197Ssam goto bad; 737105197Ssam } 738105197Ssam 739105197Ssam /* adjust state->dst if tunnel endpoint is offlink */ 740105197Ssam if (state->ro->ro_rt->rt_flags & RTF_GATEWAY) { 741105197Ssam state->dst = (struct sockaddr *)state->ro->ro_rt->rt_gateway; 742105197Ssam dst6 = (struct sockaddr_in6 *)state->dst; 743105197Ssam } 744105197Ssam } 745105197Ssam 746105197Ssam m = ipsec6_splithdr(m); 747105197Ssam if (!m) { 748105197Ssam newipsecstat.ips_out_nomem++; 749105197Ssam error = ENOMEM; 750105197Ssam goto bad; 751105197Ssam } 752105197Ssam ip6 = mtod(m, struct ip6_hdr *); 753105197Ssam return (*isr->sav->tdb_xform->xf_output)(m, isr, NULL, 754105197Ssam sizeof (struct ip6_hdr), 755105197Ssam offsetof(struct ip6_hdr, ip6_nxt)); 756105197Ssambad: 757105197Ssam if (m) 758105197Ssam m_freem(m); 759105197Ssam state->m = NULL; 760105197Ssam return error; 761105197Ssam} 762105197Ssam#endif /*INET6*/ 763