ipsec_output.c revision 105197
11366Scsgr/* $FreeBSD: head/sys/netipsec/ipsec_output.c 105197 2002-10-16 02:10:08Z sam $ */ 21366Scsgr/* $KAME: ipsec.c,v 1.103 2001/05/24 07:14:18 sakane Exp $ */ 31366Scsgr 41366Scsgr/* 51366Scsgr * IPsec output processing. 61366Scsgr */ 71366Scsgr#include "opt_inet.h" 81366Scsgr#include "opt_inet6.h" 91366Scsgr#include "opt_ipsec.h" 101366Scsgr 111366Scsgr#include <sys/param.h> 121366Scsgr#include <sys/systm.h> 131366Scsgr#include <sys/mbuf.h> 141366Scsgr#include <sys/domain.h> 151366Scsgr#include <sys/protosw.h> 161366Scsgr#include <sys/socket.h> 171366Scsgr#include <sys/errno.h> 181366Scsgr#include <sys/syslog.h> 191366Scsgr 201366Scsgr#include <net/if.h> 211366Scsgr#include <net/route.h> 221366Scsgr 231366Scsgr#include <netinet/in.h> 241366Scsgr#include <netinet/in_systm.h> 251366Scsgr#include <netinet/ip.h> 261366Scsgr#include <netinet/ip_var.h> 271366Scsgr#include <netinet/in_var.h> 281366Scsgr#include <netinet/ip_ecn.h> 291366Scsgr#ifdef INET6 301366Scsgr#include <netinet6/ip6_ecn.h> 311366Scsgr#endif 321366Scsgr 3350479Speter#include <netinet/ip6.h> 341366Scsgr#ifdef INET6 351366Scsgr#include <netinet6/ip6_var.h> 361366Scsgr#endif 371366Scsgr#include <netinet/in_pcb.h> 381366Scsgr#ifdef INET6 391376Scsgr#include <netinet/icmp6.h> 401376Scsgr#endif 411366Scsgr 421366Scsgr#include <netipsec/ipsec.h> 431366Scsgr#ifdef INET6 441366Scsgr#include <netipsec/ipsec6.h> 451366Scsgr#endif 461366Scsgr#include <netipsec/ah_var.h> 471366Scsgr#include <netipsec/esp_var.h> 481366Scsgr#include <netipsec/ipcomp_var.h> 4919411Swosch 501366Scsgr#include <netipsec/xform.h> 511366Scsgr 521366Scsgr#include <netipsec/key.h> 531366Scsgr#include <netipsec/keydb.h> 541366Scsgr#include <netipsec/key_debug.h> 551366Scsgr 561366Scsgr#include <machine/in_cksum.h> 571366Scsgr 581366Scsgrint 591366Scsgripsec_process_done(struct mbuf *m, struct ipsecrequest *isr) 601366Scsgr{ 611366Scsgr struct tdb_ident *tdbi; 621366Scsgr struct m_tag *mtag; 631366Scsgr struct secasvar *sav; 641366Scsgr struct secasindex *saidx; 651366Scsgr int error; 661366Scsgr 671366Scsgr#if 0 681366Scsgr SPLASSERT(net, "ipsec_process_done"); 691366Scsgr#endif 701366Scsgr 711366Scsgr KASSERT(m != NULL, ("ipsec_process_done: null mbuf")); 721366Scsgr KASSERT(isr != NULL, ("ipsec_process_done: null ISR")); 731366Scsgr sav = isr->sav; 741366Scsgr KASSERT(sav != NULL, ("ipsec_process_done: null SA")); 751366Scsgr KASSERT(sav->sah != NULL, ("ipsec_process_done: null SAH")); 761366Scsgr 771366Scsgr saidx = &sav->sah->saidx; 781366Scsgr switch (saidx->dst.sa.sa_family) { 791366Scsgr#ifdef INET 801366Scsgr case AF_INET: 811366Scsgr /* Fix the header length, for AH processing. */ 821366Scsgr mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len); 831366Scsgr break; 841366Scsgr#endif /* INET */ 851366Scsgr#ifdef INET6 861366Scsgr case AF_INET6: 871366Scsgr /* Fix the header length, for AH processing. */ 881366Scsgr if (m->m_pkthdr.len < sizeof (struct ip6_hdr)) { 891366Scsgr error = ENXIO; 901366Scsgr goto bad; 911366Scsgr } 921366Scsgr if (m->m_pkthdr.len - sizeof (struct ip6_hdr) > IPV6_MAXPACKET) { 931366Scsgr /* No jumbogram support. */ 941366Scsgr error = ENXIO; /*?*/ 951366Scsgr goto bad; 961366Scsgr } 9771293Sjedgar mtod(m, struct ip6_hdr *)->ip6_plen = 9871293Sjedgar htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 991366Scsgr break; 10071293Sjedgar#endif /* INET6 */ 1011366Scsgr default: 1021366Scsgr DPRINTF(("ipsec_process_done: unknown protocol family %u\n", 10371293Sjedgar saidx->dst.sa.sa_family)); 1041366Scsgr error = ENXIO; 1051366Scsgr goto bad; 1061366Scsgr } 1071366Scsgr 1081366Scsgr /* 1091366Scsgr * Add a record of what we've done or what needs to be done to the 1101366Scsgr * packet. 1111366Scsgr */ 1121366Scsgr mtag = m_tag_get(PACKET_TAG_IPSEC_OUT_DONE, 1131366Scsgr sizeof(struct tdb_ident), M_NOWAIT); 1141366Scsgr if (mtag == NULL) { 1151366Scsgr DPRINTF(("ipsec_process_done: could not get packet tag\n")); 1161366Scsgr error = ENOMEM; 1171366Scsgr goto bad; 1181366Scsgr } 1191366Scsgr 1201366Scsgr tdbi = (struct tdb_ident *)(mtag + 1); 1211366Scsgr tdbi->dst = saidx->dst; 1221366Scsgr tdbi->proto = saidx->proto; 1231366Scsgr tdbi->spi = sav->spi; 1241366Scsgr m_tag_prepend(m, mtag); 1251366Scsgr 1261366Scsgr /* 1271366Scsgr * If there's another (bundled) SA to apply, do so. 1281369Scsgr * Note that this puts a burden on the kernel stack size. 1291366Scsgr * If this is a problem we'll need to introduce a queue 1301369Scsgr * to set the packet on so we can unwind the stack before 1311366Scsgr * doing further processing. 1321366Scsgr */ 1331366Scsgr if (isr->next) { 1341369Scsgr newipsecstat.ips_out_bundlesa++; 1351370Scsgr return ipsec4_process_packet(m, isr->next, 0, 0); 1361366Scsgr } 1371366Scsgr 1381366Scsgr /* 1391366Scsgr * We're done with IPsec processing, transmit the packet using the 1401366Scsgr * appropriate network protocol (IP or IPv6). SPD lookup will be 1411366Scsgr * performed again there. 1421366Scsgr */ 1431366Scsgr switch (saidx->dst.sa.sa_family) { 1441366Scsgr#ifdef INET 1451366Scsgr struct ip *ip; 1461366Scsgr case AF_INET: 1471366Scsgr ip = mtod(m, struct ip *); 1481369Scsgr ip->ip_len = ntohs(ip->ip_len); 1491366Scsgr ip->ip_off = ntohs(ip->ip_off); 1501366Scsgr 1511366Scsgr return ip_output(m, NULL, NULL, IP_RAWOUTPUT, NULL, NULL); 1521366Scsgr#endif /* INET */ 1531366Scsgr#ifdef INET6 1541366Scsgr case AF_INET6: 1551366Scsgr /* 1561366Scsgr * We don't need massage, IPv6 header fields are always in 1571376Scsgr * net endian. 1581376Scsgr */ 1591376Scsgr return ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL); 1601376Scsgr#endif /* INET6 */ 1611376Scsgr } 1621376Scsgr panic("ipsec_process_done"); 1631376Scsgrbad: 1641376Scsgr m_freem(m); 1651376Scsgr KEY_FREESAV(&sav); 1666403Sjkh return (error); 1671376Scsgr} 1681376Scsgr 1691376Scsgrstatic struct ipsecrequest * 1701376Scsgripsec_nextisr( 1711376Scsgr struct mbuf *m, 1721376Scsgr struct ipsecrequest *isr, 1731376Scsgr int af, 1741376Scsgr struct secasindex *saidx, 1751376Scsgr int *error 1761376Scsgr) 1771376Scsgr{ 1781376Scsgr#define IPSEC_OSTAT(x,y,z) (isr->saidx.proto == IPPROTO_ESP ? (x)++ : \ 1791376Scsgr isr->saidx.proto == IPPROTO_AH ? (y)++ : (z)++) 1801376Scsgr struct secasvar *sav; 1811376Scsgr 1821376Scsgr#if 0 1831376Scsgr SPLASSERT(net, "ipsec_nextisr"); 18471293Sjedgar#endif 1851376Scsgr KASSERT(af == AF_INET || af == AF_INET6, 18671293Sjedgar ("ipsec_nextisr: invalid address family %u", af)); 1871376Scsgragain: 18871293Sjedgar /* 1891376Scsgr * Craft SA index to search for proper SA. Note that 19071293Sjedgar * we only fillin unspecified SA peers for transport 1911376Scsgr * mode; for tunnel mode they must already be filled in. 1921376Scsgr */ 1931376Scsgr *saidx = isr->saidx; 1941376Scsgr if (isr->saidx.mode == IPSEC_MODE_TRANSPORT) { 1951376Scsgr /* Fillin unspecified SA peers only for transport mode */ 1961376Scsgr if (af == AF_INET) { 1971376Scsgr struct sockaddr_in *sin; 1981376Scsgr struct ip *ip = mtod(m, struct ip *); 1991376Scsgr 2001376Scsgr if (saidx->src.sa.sa_len == 0) { 2011376Scsgr sin = &saidx->src.sin; 2021376Scsgr sin->sin_len = sizeof(*sin); 2031376Scsgr sin->sin_family = AF_INET; 2041376Scsgr sin->sin_port = IPSEC_PORT_ANY; 2051376Scsgr sin->sin_addr = ip->ip_src; 2061376Scsgr } 2071376Scsgr if (saidx->dst.sa.sa_len == 0) { 2081376Scsgr sin = &saidx->dst.sin; 2091376Scsgr sin->sin_len = sizeof(*sin); 2101376Scsgr sin->sin_family = AF_INET; 2111376Scsgr sin->sin_port = IPSEC_PORT_ANY; 2121376Scsgr sin->sin_addr = ip->ip_dst; 2131376Scsgr } 2141376Scsgr } else { 2151376Scsgr struct sockaddr_in6 *sin6; 2161376Scsgr struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 2171376Scsgr 2181376Scsgr if (saidx->src.sin6.sin6_len == 0) { 2191376Scsgr sin6 = (struct sockaddr_in6 *)&saidx->src; 2201376Scsgr sin6->sin6_len = sizeof(*sin6); 2211376Scsgr sin6->sin6_family = AF_INET6; 2221376Scsgr sin6->sin6_port = IPSEC_PORT_ANY; 2231376Scsgr sin6->sin6_addr = ip6->ip6_src; 2241376Scsgr if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 2251376Scsgr /* fix scope id for comparing SPD */ 2261376Scsgr sin6->sin6_addr.s6_addr16[1] = 0; 2271376Scsgr sin6->sin6_scope_id = 2281376Scsgr ntohs(ip6->ip6_src.s6_addr16[1]); 2291376Scsgr } 2301376Scsgr } 2311376Scsgr if (saidx->dst.sin6.sin6_len == 0) { 2321376Scsgr sin6 = (struct sockaddr_in6 *)&saidx->dst; 2331376Scsgr sin6->sin6_len = sizeof(*sin6); 2341376Scsgr sin6->sin6_family = AF_INET6; 2351376Scsgr sin6->sin6_port = IPSEC_PORT_ANY; 2361376Scsgr sin6->sin6_addr = ip6->ip6_dst; 2371376Scsgr if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 2381376Scsgr /* fix scope id for comparing SPD */ 2391376Scsgr sin6->sin6_addr.s6_addr16[1] = 0; 2401376Scsgr sin6->sin6_scope_id = 2411376Scsgr ntohs(ip6->ip6_dst.s6_addr16[1]); 2421376Scsgr } 2431376Scsgr } 2441376Scsgr } 2451376Scsgr } 2461376Scsgr 2471376Scsgr /* 2481376Scsgr * Lookup SA and validate it. 2491376Scsgr */ 2501366Scsgr *error = key_checkrequest(isr, saidx); 2511366Scsgr if (*error != 0) { 2521366Scsgr /* 2531366Scsgr * IPsec processing is required, but no SA found. 2541366Scsgr * I assume that key_acquire() had been called 2551366Scsgr * to get/establish the SA. Here I discard 2561366Scsgr * this packet because it is responsibility for 2571366Scsgr * upper layer to retransmit the packet. 2581366Scsgr */ 2591366Scsgr newipsecstat.ips_out_nosa++; 2601366Scsgr goto bad; 2611366Scsgr } 2621366Scsgr sav = isr->sav; 2631366Scsgr if (sav == NULL) { /* XXX valid return */ 2641366Scsgr KASSERT(ipsec_get_reqlevel(isr) == IPSEC_LEVEL_USE, 2651366Scsgr ("ipsec_nextisr: no SA found, but required; level %u", 2661366Scsgr ipsec_get_reqlevel(isr))); 2671366Scsgr isr = isr->next; 2681366Scsgr if (isr == NULL) { 2691366Scsgr /*XXXstatistic??*/ 2701366Scsgr *error = EINVAL; /*XXX*/ 2711366Scsgr return isr; 2721366Scsgr } 2731366Scsgr goto again; 2741366Scsgr } 2751366Scsgr 2761366Scsgr /* 2771366Scsgr * Check system global policy controls. 2781366Scsgr */ 2791366Scsgr if ((isr->saidx.proto == IPPROTO_ESP && !esp_enable) || 2801366Scsgr (isr->saidx.proto == IPPROTO_AH && !ah_enable) || 2811366Scsgr (isr->saidx.proto == IPPROTO_IPCOMP && !ipcomp_enable)) { 2821366Scsgr DPRINTF(("ipsec_nextisr: IPsec outbound packet dropped due" 2831366Scsgr " to policy (check your sysctls)\n")); 2841366Scsgr IPSEC_OSTAT(espstat.esps_pdrops, ahstat.ahs_pdrops, 28571293Sjedgar ipcompstat.ipcomps_pdrops); 2861370Scsgr *error = EHOSTUNREACH; 28771293Sjedgar goto bad; 2881366Scsgr } 28971293Sjedgar 2901366Scsgr /* 2911366Scsgr * Sanity check the SA contents for the caller 29271293Sjedgar * before they invoke the xform output method. 2931366Scsgr */ 2941366Scsgr if (sav->tdb_xform == NULL) { 2951366Scsgr DPRINTF(("ipsec_nextisr: no transform for SA\n")); 2961366Scsgr IPSEC_OSTAT(espstat.esps_noxform, ahstat.ahs_noxform, 2971366Scsgr ipcompstat.ipcomps_noxform); 2981366Scsgr *error = EHOSTUNREACH; 2991366Scsgr goto bad; 3001366Scsgr } 3011366Scsgr return isr; 3021366Scsgrbad: 3031366Scsgr KASSERT(*error != 0, ("ipsec_nextisr: error return w/ no error code")); 3041366Scsgr return NULL; 3051366Scsgr#undef IPSEC_OSTAT 3061366Scsgr} 3071366Scsgr 3081366Scsgr#ifdef INET 3091366Scsgr/* 3101366Scsgr * IPsec output logic for IPv4. 3111366Scsgr */ 3121376Scsgrint 3131366Scsgripsec4_process_packet( 3141366Scsgr struct mbuf *m, 3151366Scsgr struct ipsecrequest *isr, 3161369Scsgr int flags, 3171376Scsgr int tunalready) 3181366Scsgr{ 3191376Scsgr struct secasindex saidx; 3201376Scsgr struct secasvar *sav; 3211369Scsgr struct ip *ip; 3221366Scsgr int s, error, i, off; 3231366Scsgr 3241366Scsgr KASSERT(m != NULL, ("ipsec4_process_packet: null mbuf")); 3251369Scsgr KASSERT(isr != NULL, ("ipsec4_process_packet: null isr")); 3261369Scsgr 3271366Scsgr s = splnet(); /* insure SA contents don't change */ 3281366Scsgr 3291366Scsgr isr = ipsec_nextisr(m, isr, AF_INET, &saidx, &error); 3301366Scsgr if (isr == NULL) 3311376Scsgr goto bad; 3321366Scsgr 3331366Scsgr sav = isr->sav; 3341376Scsgr if (!tunalready) { 3351366Scsgr union sockaddr_union *dst = &sav->sah->saidx.dst; 3361366Scsgr int setdf; 3371366Scsgr 3381366Scsgr /* 3391369Scsgr * Collect IP_DF state from the outer header. 3401366Scsgr */ 3411366Scsgr if (dst->sa.sa_family == AF_INET) { 3421366Scsgr if (m->m_len < sizeof (struct ip) && 3431366Scsgr (m = m_pullup(m, sizeof (struct ip))) == NULL) { 3441366Scsgr error = ENOBUFS; 3451366Scsgr goto bad; 3461366Scsgr } 3471366Scsgr ip = mtod(m, struct ip *); 3481366Scsgr /* Honor system-wide control of how to handle IP_DF */ 3491366Scsgr switch (ip4_ipsec_dfbit) { 3501366Scsgr case 0: /* clear in outer header */ 3511366Scsgr case 1: /* set in outer header */ 35229847Scharnier setdf = ip4_ipsec_dfbit; 35329847Scharnier break; 35429847Scharnier default: /* propagate to outer header */ 35529847Scharnier setdf = ntohs(ip->ip_off & IP_DF); 3561366Scsgr break; 3571366Scsgr } 3581366Scsgr } else { 3591376Scsgr ip = NULL; /* keep compiler happy */ 3601376Scsgr setdf = 0; 3611376Scsgr } 3621376Scsgr /* Do the appropriate encapsulation, if necessary */ 3631376Scsgr if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */ 3641376Scsgr dst->sa.sa_family != AF_INET || /* PF mismatch */ 3651376Scsgr#if 0 3661376Scsgr (sav->flags & SADB_X_SAFLAGS_TUNNEL) || /* Tunnel requ'd */ 3671376Scsgr sav->tdb_xform->xf_type == XF_IP4 || /* ditto */ 3681376Scsgr#endif 3691366Scsgr (dst->sa.sa_family == AF_INET && /* Proxy */ 3701366Scsgr dst->sin.sin_addr.s_addr != INADDR_ANY && 3711366Scsgr dst->sin.sin_addr.s_addr != ip->ip_dst.s_addr)) { 3721366Scsgr struct mbuf *mp; 37313601Swosch 3741366Scsgr /* Fix IPv4 header checksum and length */ 3751366Scsgr if (m->m_len < sizeof (struct ip) && 3761366Scsgr (m = m_pullup(m, sizeof (struct ip))) == NULL) { 3771366Scsgr error = ENOBUFS; 3781366Scsgr goto bad; 3791366Scsgr } 3801366Scsgr ip = mtod(m, struct ip *); 381 ip->ip_len = htons(m->m_pkthdr.len); 382 ip->ip_sum = 0; 383#ifdef _IP_VHL 384 if (ip->ip_vhl == IP_VHL_BORING) 385 ip->ip_sum = in_cksum_hdr(ip); 386 else 387 ip->ip_sum = in_cksum(m, 388 _IP_VHL_HL(ip->ip_vhl) << 2); 389#else 390 ip->ip_sum = in_cksum(m, ip->ip_hl << 2); 391#endif 392 393 /* Encapsulate the packet */ 394 error = ipip_output(m, isr, &mp, 0, 0); 395 if (mp == NULL && !error) { 396 /* Should never happen. */ 397 DPRINTF(("ipsec4_process_packet: ipip_output " 398 "returns no mbuf and no error!")); 399 error = EFAULT; 400 } 401 if (error) { 402 if (mp) 403 m_freem(mp); 404 goto bad; 405 } 406 m = mp, mp = NULL; 407 /* 408 * ipip_output clears IP_DF in the new header. If 409 * we need to propagate IP_DF from the outer header, 410 * then we have to do it here. 411 * 412 * XXX shouldn't assume what ipip_output does. 413 */ 414 if (dst->sa.sa_family == AF_INET && setdf) { 415 if (m->m_len < sizeof (struct ip) && 416 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 417 error = ENOBUFS; 418 goto bad; 419 } 420 ip = mtod(m, struct ip *); 421 ip->ip_off = ntohs(ip->ip_off); 422 ip->ip_off |= IP_DF; 423 ip->ip_off = htons(ip->ip_off); 424 } 425 } 426 } 427 428 /* 429 * Dispatch to the appropriate IPsec transform logic. The 430 * packet will be returned for transmission after crypto 431 * processing, etc. are completed. For encapsulation we 432 * bypass this call because of the explicit call done above 433 * (necessary to deal with IP_DF handling for IPv4). 434 * 435 * NB: m & sav are ``passed to caller'' who's reponsible for 436 * for reclaiming their resources. 437 */ 438 if (sav->tdb_xform->xf_type != XF_IP4) { 439 ip = mtod(m, struct ip *); 440 i = ip->ip_hl << 2; 441 off = offsetof(struct ip, ip_p); 442 error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off); 443 } else { 444 error = ipsec_process_done(m, isr); 445 } 446 splx(s); 447 return error; 448bad: 449 splx(s); 450 if (m) 451 m_freem(m); 452 return error; 453} 454#endif 455 456#ifdef INET6 457/* 458 * Chop IP6 header from the payload. 459 */ 460static struct mbuf * 461ipsec6_splithdr(struct mbuf *m) 462{ 463 struct mbuf *mh; 464 struct ip6_hdr *ip6; 465 int hlen; 466 467 KASSERT(m->m_len >= sizeof (struct ip6_hdr), 468 ("ipsec6_splithdr: first mbuf too short, len %u", m->m_len)); 469 ip6 = mtod(m, struct ip6_hdr *); 470 hlen = sizeof(struct ip6_hdr); 471 if (m->m_len > hlen) { 472 MGETHDR(mh, M_DONTWAIT, MT_HEADER); 473 if (!mh) { 474 m_freem(m); 475 return NULL; 476 } 477 M_COPY_PKTHDR(mh, m); 478 MH_ALIGN(mh, hlen); 479 m->m_len -= hlen; 480 m->m_data += hlen; 481 mh->m_next = m; 482 m = mh; 483 m->m_len = hlen; 484 bcopy((caddr_t)ip6, mtod(m, caddr_t), hlen); 485 } else if (m->m_len < hlen) { 486 m = m_pullup(m, hlen); 487 if (!m) 488 return NULL; 489 } 490 return m; 491} 492 493/* 494 * IPsec output logic for IPv6, transport mode. 495 */ 496int 497ipsec6_output_trans( 498 struct ipsec_output_state *state, 499 u_char *nexthdrp, 500 struct mbuf *mprev, 501 struct secpolicy *sp, 502 int flags, 503 int *tun) 504{ 505 struct ipsecrequest *isr; 506 struct secasindex saidx; 507 int error = 0; 508 struct mbuf *m; 509 510 KASSERT(state != NULL, ("ipsec6_output: null state")); 511 KASSERT(state->m != NULL, ("ipsec6_output: null m")); 512 KASSERT(nexthdrp != NULL, ("ipsec6_output: null nexthdrp")); 513 KASSERT(mprev != NULL, ("ipsec6_output: null mprev")); 514 KASSERT(sp != NULL, ("ipsec6_output: null sp")); 515 KASSERT(tun != NULL, ("ipsec6_output: null tun")); 516 517 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 518 printf("ipsec6_output_trans: applyed SP\n"); 519 kdebug_secpolicy(sp)); 520 521 isr = sp->req; 522 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 523 /* the rest will be handled by ipsec6_output_tunnel() */ 524 *tun = 1; /* need tunnel-mode processing */ 525 return 0; 526 } 527 528 *tun = 0; 529 m = state->m; 530 531 isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error); 532 if (isr == NULL) { 533#ifdef notdef 534 /* XXX should notification be done for all errors ? */ 535 /* 536 * Notify the fact that the packet is discarded 537 * to ourselves. I believe this is better than 538 * just silently discarding. (jinmei@kame.net) 539 * XXX: should we restrict the error to TCP packets? 540 * XXX: should we directly notify sockets via 541 * pfctlinputs? 542 */ 543 icmp6_error(m, ICMP6_DST_UNREACH, 544 ICMP6_DST_UNREACH_ADMIN, 0); 545 m = NULL; /* NB: icmp6_error frees mbuf */ 546#endif 547 goto bad; 548 } 549 550 return (*isr->sav->tdb_xform->xf_output)(m, isr, NULL, 551 sizeof (struct ip6_hdr), 552 offsetof(struct ip6_hdr, ip6_nxt)); 553bad: 554 if (m) 555 m_freem(m); 556 state->m = NULL; 557 return error; 558} 559 560static int 561ipsec6_encapsulate(struct mbuf *m, struct secasvar *sav) 562{ 563 struct ip6_hdr *oip6; 564 struct ip6_hdr *ip6; 565 size_t plen; 566 567 /* can't tunnel between different AFs */ 568 if (sav->sah->saidx.src.sa.sa_family != AF_INET6 || 569 sav->sah->saidx.dst.sa.sa_family != AF_INET6) { 570 m_freem(m); 571 return EINVAL; 572 } 573 KASSERT(m->m_len != sizeof (struct ip6_hdr), 574 ("ipsec6_encapsulate: mbuf wrong size; len %u", m->m_len)); 575 576 577 /* 578 * grow the mbuf to accomodate the new IPv6 header. 579 */ 580 plen = m->m_pkthdr.len; 581 if (M_LEADINGSPACE(m->m_next) < sizeof(struct ip6_hdr)) { 582 struct mbuf *n; 583 MGET(n, M_DONTWAIT, MT_DATA); 584 if (!n) { 585 m_freem(m); 586 return ENOBUFS; 587 } 588 n->m_len = sizeof(struct ip6_hdr); 589 n->m_next = m->m_next; 590 m->m_next = n; 591 m->m_pkthdr.len += sizeof(struct ip6_hdr); 592 oip6 = mtod(n, struct ip6_hdr *); 593 } else { 594 m->m_next->m_len += sizeof(struct ip6_hdr); 595 m->m_next->m_data -= sizeof(struct ip6_hdr); 596 m->m_pkthdr.len += sizeof(struct ip6_hdr); 597 oip6 = mtod(m->m_next, struct ip6_hdr *); 598 } 599 ip6 = mtod(m, struct ip6_hdr *); 600 ovbcopy((caddr_t)ip6, (caddr_t)oip6, sizeof(struct ip6_hdr)); 601 602 /* Fake link-local scope-class addresses */ 603 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src)) 604 oip6->ip6_src.s6_addr16[1] = 0; 605 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst)) 606 oip6->ip6_dst.s6_addr16[1] = 0; 607 608 /* construct new IPv6 header. see RFC 2401 5.1.2.2 */ 609 /* ECN consideration. */ 610 ip6_ecn_ingress(ip6_ipsec_ecn, &ip6->ip6_flow, &oip6->ip6_flow); 611 if (plen < IPV6_MAXPACKET - sizeof(struct ip6_hdr)) 612 ip6->ip6_plen = htons(plen); 613 else { 614 /* ip6->ip6_plen will be updated in ip6_output() */ 615 } 616 ip6->ip6_nxt = IPPROTO_IPV6; 617 sav->sah->saidx.src.sin6.sin6_addr = ip6->ip6_src; 618 sav->sah->saidx.dst.sin6.sin6_addr = ip6->ip6_dst; 619 ip6->ip6_hlim = IPV6_DEFHLIM; 620 621 /* XXX Should ip6_src be updated later ? */ 622 623 return 0; 624} 625 626/* 627 * IPsec output logic for IPv6, tunnel mode. 628 */ 629int 630ipsec6_output_tunnel(struct ipsec_output_state *state, struct secpolicy *sp, int flags) 631{ 632 struct ip6_hdr *ip6; 633 struct ipsecrequest *isr; 634 struct secasindex saidx; 635 int error; 636 struct sockaddr_in6* dst6; 637 struct mbuf *m; 638 639 KASSERT(state != NULL, ("ipsec6_output: null state")); 640 KASSERT(state->m != NULL, ("ipsec6_output: null m")); 641 KASSERT(sp != NULL, ("ipsec6_output: null sp")); 642 643 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 644 printf("ipsec6_output_tunnel: applyed SP\n"); 645 kdebug_secpolicy(sp)); 646 647 m = state->m; 648 /* 649 * transport mode ipsec (before the 1st tunnel mode) is already 650 * processed by ipsec6_output_trans(). 651 */ 652 for (isr = sp->req; isr; isr = isr->next) { 653 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 654 break; 655 } 656 isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error); 657 if (isr == NULL) 658 goto bad; 659 660 /* 661 * There may be the case that SA status will be changed when 662 * we are refering to one. So calling splsoftnet(). 663 */ 664 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 665 /* 666 * build IPsec tunnel. 667 */ 668 /* XXX should be processed with other familiy */ 669 if (isr->sav->sah->saidx.src.sa.sa_family != AF_INET6) { 670 ipseclog((LOG_ERR, "ipsec6_output_tunnel: " 671 "family mismatched between inner and outer, spi=%u\n", 672 ntohl(isr->sav->spi))); 673 newipsecstat.ips_out_inval++; 674 error = EAFNOSUPPORT; 675 goto bad; 676 } 677 678 m = ipsec6_splithdr(m); 679 if (!m) { 680 newipsecstat.ips_out_nomem++; 681 error = ENOMEM; 682 goto bad; 683 } 684 error = ipsec6_encapsulate(m, isr->sav); 685 if (error) { 686 m = NULL; 687 goto bad; 688 } 689 ip6 = mtod(m, struct ip6_hdr *); 690 691 state->ro = &isr->sav->sah->sa_route; 692 state->dst = (struct sockaddr *)&state->ro->ro_dst; 693 dst6 = (struct sockaddr_in6 *)state->dst; 694 if (state->ro->ro_rt 695 && ((state->ro->ro_rt->rt_flags & RTF_UP) == 0 696 || !IN6_ARE_ADDR_EQUAL(&dst6->sin6_addr, &ip6->ip6_dst))) { 697 RTFREE(state->ro->ro_rt); 698 state->ro->ro_rt = NULL; 699 } 700 if (state->ro->ro_rt == 0) { 701 bzero(dst6, sizeof(*dst6)); 702 dst6->sin6_family = AF_INET6; 703 dst6->sin6_len = sizeof(*dst6); 704 dst6->sin6_addr = ip6->ip6_dst; 705 rtalloc(state->ro); 706 } 707 if (state->ro->ro_rt == 0) { 708 ip6stat.ip6s_noroute++; 709 newipsecstat.ips_out_noroute++; 710 error = EHOSTUNREACH; 711 goto bad; 712 } 713 714 /* adjust state->dst if tunnel endpoint is offlink */ 715 if (state->ro->ro_rt->rt_flags & RTF_GATEWAY) { 716 state->dst = (struct sockaddr *)state->ro->ro_rt->rt_gateway; 717 dst6 = (struct sockaddr_in6 *)state->dst; 718 } 719 } 720 721 m = ipsec6_splithdr(m); 722 if (!m) { 723 newipsecstat.ips_out_nomem++; 724 error = ENOMEM; 725 goto bad; 726 } 727 ip6 = mtod(m, struct ip6_hdr *); 728 return (*isr->sav->tdb_xform->xf_output)(m, isr, NULL, 729 sizeof (struct ip6_hdr), 730 offsetof(struct ip6_hdr, ip6_nxt)); 731bad: 732 if (m) 733 m_freem(m); 734 state->m = NULL; 735 return error; 736} 737#endif /*INET6*/ 738