1 /* $NetBSD: ipsecif.c,v 1.18 2019/11/01 04:28:14 knakahara Exp $ */ 2 3 /* 4 * Copyright (c) 2017 Internet Initiative Japan Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __KERNEL_RCSID(0, "$NetBSD: ipsecif.c,v 1.18 2019/11/01 04:28:14 knakahara Exp $"); 31 32 #ifdef _KERNEL_OPT 33 #include "opt_inet.h" 34 #include "opt_ipsec.h" 35 #endif 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/socket.h> 40 #include <sys/sockio.h> 41 #include <sys/mbuf.h> 42 #include <sys/errno.h> 43 #include <sys/ioctl.h> 44 #include <sys/syslog.h> 45 #include <sys/kernel.h> 46 47 #include <net/if.h> 48 #include <net/route.h> 49 50 #include <netinet/in.h> 51 #include <netinet/in_systm.h> 52 #include <netinet/ip.h> 53 #include <netinet/ip_var.h> 54 #include <netinet/in_var.h> 55 #include <netinet/ip_encap.h> 56 #include <netinet/ip_ecn.h> 57 #include <netinet/ip_private.h> 58 #include <netinet/udp.h> 59 60 #ifdef INET6 61 #include <netinet/ip6.h> 62 #include <netinet6/ip6_var.h> 63 #include <netinet6/ip6_private.h> 64 #include <netinet6/in6_var.h> 65 #include <netinet6/ip6protosw.h> /* for struct ip6ctlparam */ 66 #include <netinet/ip_ecn.h> 67 #endif 68 69 #include <netipsec/key.h> 70 #include <netipsec/ipsecif.h> 71 72 #include <net/if_ipsec.h> 73 74 static int ipsecif_set_natt_ports(struct ipsec_variant *, struct mbuf *); 75 static void ipsecif4_input(struct mbuf *, int, int, void *); 76 static int ipsecif4_output(struct ipsec_variant *, int, struct mbuf *); 77 static int ipsecif4_filter4(const struct ip *, struct ipsec_variant *, 78 struct ifnet *); 79 80 #ifdef INET6 81 static int ipsecif6_input(struct mbuf **, int *, int, void *); 82 static int ipsecif6_output(struct ipsec_variant *, int, struct mbuf *); 83 static int ipsecif6_filter6(const struct ip6_hdr *, struct ipsec_variant *, 84 struct ifnet *); 85 #endif 86 87 static int ip_ipsec_ttl = IPSEC_TTL; 88 static int ip_ipsec_copy_tos = 0; 89 #ifdef INET6 90 int ip6_ipsec_hlim = IPSEC_HLIM; 91 int ip6_ipsec_pmtu = 0; 92 static int ip6_ipsec_copy_tos = 0; 93 #endif 94 95 static const struct encapsw ipsecif4_encapsw = { 96 .encapsw4 = { 97 .pr_input = ipsecif4_input, 98 .pr_ctlinput = NULL, 99 } 100 }; 101 102 #ifdef INET6 103 static const struct encapsw ipsecif6_encapsw; 104 #endif 105 106 static int 107 ipsecif_set_natt_ports(struct ipsec_variant *var, struct mbuf *m) 108 { 109 110 KASSERT(if_ipsec_heldref_variant(var)); 111 112 if (var->iv_sport || var->iv_dport) { 113 struct m_tag *mtag; 114 115 mtag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS, 116 sizeof(uint16_t) + sizeof(uint16_t), M_DONTWAIT); 117 if (mtag) { 118 uint16_t *natt_port; 119 120 natt_port = (uint16_t *)(mtag + 1); 121 natt_port[0] = var->iv_dport; 122 natt_port[1] = var->iv_sport; 123 m_tag_prepend(m, mtag); 124 } else { 125 return ENOBUFS; 126 } 127 } 128 129 return 0; 130 } 131 132 static struct mbuf * 133 ipsecif4_prepend_hdr(struct ipsec_variant *var, struct mbuf *m, 134 uint8_t proto, uint8_t tos) 135 { 136 struct ip *ip; 137 struct sockaddr_in *src, *dst; 138 139 src = satosin(var->iv_psrc); 140 dst = satosin(var->iv_pdst); 141 142 if (in_nullhost(src->sin_addr) || in_nullhost(src->sin_addr) || 143 src->sin_addr.s_addr == INADDR_BROADCAST || 144 dst->sin_addr.s_addr == INADDR_BROADCAST) { 145 m_freem(m); 146 return NULL; 147 } 148 m->m_flags &= ~M_BCAST; 149 150 if (IN_MULTICAST(src->sin_addr.s_addr) || 151 IN_MULTICAST(dst->sin_addr.s_addr)) { 152 m_freem(m); 153 return NULL; 154 } 155 156 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 157 if (m && M_UNWRITABLE(m, sizeof(struct ip))) 158 m = m_pullup(m, sizeof(struct ip)); 159 if (m == NULL) 160 return NULL; 161 162 ip = mtod(m, struct ip *); 163 ip->ip_v = IPVERSION; 164 ip->ip_off = htons(0); 165 if (m->m_pkthdr.len < IP_MINFRAGSIZE) 166 ip->ip_id = 0; 167 else 168 ip->ip_id = ip_newid(NULL); 169 ip->ip_hl = sizeof(*ip) >> 2; 170 if (ip_ipsec_copy_tos) 171 ip->ip_tos = tos; 172 else 173 ip->ip_tos = 0; 174 ip->ip_sum = 0; 175 ip->ip_src = src->sin_addr; 176 ip->ip_dst = dst->sin_addr; 177 ip->ip_p = proto; 178 ip->ip_ttl = ip_ipsec_ttl; 179 ip->ip_len = htons(m->m_pkthdr.len); 180 #ifndef IPSEC_TX_TOS_CLEAR 181 struct ifnet *ifp = &var->iv_softc->ipsec_if; 182 if (ifp->if_flags & IFF_ECN) 183 ip_ecn_ingress(ECN_ALLOWED, &ip->ip_tos, &tos); 184 else 185 ip_ecn_ingress(ECN_NOCARE, &ip->ip_tos, &tos); 186 #endif 187 188 return m; 189 } 190 191 static int 192 ipsecif4_needfrag(struct mbuf *m, struct ipsecrequest *isr) 193 { 194 struct ip ip0; 195 struct ip *ip; 196 int mtu; 197 struct secasvar *sav; 198 199 sav = key_lookup_sa_bysaidx(&isr->saidx); 200 if (sav == NULL) 201 return 0; 202 203 if (!(sav->natt_type & UDP_ENCAP_ESPINUDP)) { 204 mtu = 0; 205 goto out; 206 } 207 208 if (m->m_len < sizeof(struct ip)) { 209 m_copydata(m, 0, sizeof(ip0), &ip0); 210 ip = &ip0; 211 } else { 212 ip = mtod(m, struct ip *); 213 } 214 mtu = sav->esp_frag; 215 if (ntohs(ip->ip_len) <= mtu) 216 mtu = 0; 217 218 out: 219 KEY_SA_UNREF(&sav); 220 return mtu; 221 } 222 223 static struct mbuf * 224 ipsecif4_flowinfo(struct mbuf *m, int family, int *proto0, u_int8_t *tos0) 225 { 226 const struct ip *ip; 227 int proto; 228 int tos; 229 230 KASSERT(proto0 != NULL); 231 KASSERT(tos0 != NULL); 232 233 switch (family) { 234 case AF_INET: 235 proto = IPPROTO_IPV4; 236 if (m->m_len < sizeof(*ip)) { 237 m = m_pullup(m, sizeof(*ip)); 238 if (m == NULL) { 239 *tos0 = 0; 240 *proto0 = 0; 241 return NULL; 242 } 243 } 244 ip = mtod(m, const struct ip *); 245 tos = ip->ip_tos; 246 /* TODO: support ALTQ for innner packet */ 247 break; 248 #ifdef INET6 249 case AF_INET6: { 250 const struct ip6_hdr *ip6; 251 proto = IPPROTO_IPV6; 252 if (m->m_len < sizeof(*ip6)) { 253 m = m_pullup(m, sizeof(*ip6)); 254 if (m == NULL) { 255 *tos0 = 0; 256 *proto0 = 0; 257 return NULL; 258 } 259 } 260 ip6 = mtod(m, const struct ip6_hdr *); 261 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 262 /* TODO: support ALTQ for innner packet */ 263 break; 264 } 265 #endif /* INET6 */ 266 default: 267 *tos0 = 0; 268 *proto0 = 0; 269 return NULL; 270 } 271 272 *proto0 = proto; 273 *tos0 = tos; 274 return m; 275 } 276 277 static int 278 ipsecif4_fragout(struct ipsec_variant *var, int family, struct mbuf *m, int mtu) 279 { 280 struct ifnet *ifp = &var->iv_softc->ipsec_if; 281 struct mbuf *next; 282 struct m_tag *mtag; 283 int error; 284 285 KASSERT(if_ipsec_heldref_variant(var)); 286 287 mtag = m_tag_find(m, PACKET_TAG_IPSEC_NAT_T_PORTS); 288 if (mtag) 289 m_tag_delete(m, mtag); 290 291 /* consider new IP header prepended in ipsecif4_output() */ 292 if (mtu <= sizeof(struct ip)) { 293 m_freem(m); 294 return ENETUNREACH; 295 } 296 m->m_pkthdr.csum_flags |= M_CSUM_IPv4; 297 error = ip_fragment(m, ifp, mtu - sizeof(struct ip)); 298 if (error) 299 return error; 300 301 for (error = 0; m; m = next) { 302 next = m->m_nextpkt; 303 m->m_nextpkt = NULL; 304 if (error) { 305 m_freem(m); 306 continue; 307 } 308 309 error = ipsecif4_output(var, family, m); 310 } 311 if (error == 0) 312 IP_STATINC(IP_STAT_FRAGMENTED); 313 314 return error; 315 } 316 317 int 318 ipsecif4_encap_func(struct mbuf *m, struct ip *ip, struct ipsec_variant *var) 319 { 320 struct m_tag *mtag; 321 struct sockaddr_in *src, *dst; 322 u_int16_t src_port = 0; 323 u_int16_t dst_port = 0; 324 325 KASSERT(var != NULL); 326 327 src = satosin(var->iv_psrc); 328 dst = satosin(var->iv_pdst); 329 mtag = m_tag_find(m, PACKET_TAG_IPSEC_NAT_T_PORTS); 330 if (mtag) { 331 u_int16_t *ports; 332 333 ports = (u_int16_t *)(mtag + 1); 334 src_port = ports[0]; 335 dst_port = ports[1]; 336 } 337 338 /* address match */ 339 if (src->sin_addr.s_addr != ip->ip_dst.s_addr || 340 dst->sin_addr.s_addr != ip->ip_src.s_addr) 341 return 0; 342 343 /* UDP encap? */ 344 if (mtag == NULL && var->iv_sport == 0 && var->iv_dport == 0) 345 goto match; 346 347 /* port match */ 348 if (src_port != var->iv_dport || 349 dst_port != var->iv_sport) { 350 #ifdef DEBUG 351 printf("%s: port mismatch: pkt(%u, %u), if(%u, %u)\n", 352 __func__, ntohs(src_port), ntohs(dst_port), 353 ntohs(var->iv_sport), ntohs(var->iv_dport)); 354 #endif 355 return 0; 356 } 357 358 match: 359 /* 360 * hide NAT-T information from encapsulated traffics. 361 * they don't know about IPsec. 362 */ 363 if (mtag) 364 m_tag_delete(m, mtag); 365 return sizeof(src->sin_addr) + sizeof(dst->sin_addr); 366 } 367 368 static int 369 ipsecif4_output(struct ipsec_variant *var, int family, struct mbuf *m) 370 { 371 struct secpolicy *sp = NULL; 372 u_int8_t tos; 373 int proto; 374 int error; 375 int mtu; 376 u_long sa_mtu = 0; 377 378 KASSERT(if_ipsec_heldref_variant(var)); 379 KASSERT(if_ipsec_variant_is_configured(var)); 380 KASSERT(var->iv_psrc->sa_family == AF_INET); 381 KASSERT(var->iv_pdst->sa_family == AF_INET); 382 383 sp = IV_SP_OUT(var); 384 KASSERT(sp != NULL); 385 /* 386 * The SPs in ipsec_variant are prevented from freed by 387 * ipsec_variant->iv_psref. So, KEY_SP_REF() is unnecessary here. 388 */ 389 390 KASSERT(sp->policy != IPSEC_POLICY_NONE); 391 KASSERT(sp->policy != IPSEC_POLICY_ENTRUST); 392 KASSERT(sp->policy != IPSEC_POLICY_BYPASS); 393 if (sp->policy != IPSEC_POLICY_IPSEC) { 394 m_freem(m); 395 error = ENETUNREACH; 396 goto done; 397 } 398 399 /* get flowinfo */ 400 m = ipsecif4_flowinfo(m, family, &proto, &tos); 401 if (m == NULL) { 402 error = ENETUNREACH; 403 goto done; 404 } 405 406 /* prepend new IP header */ 407 m = ipsecif4_prepend_hdr(var, m, proto, tos); 408 if (m == NULL) { 409 error = ENETUNREACH; 410 goto done; 411 } 412 413 /* 414 * Normal netipsec's NAT-T fragmentation is done in ip_output(). 415 * See "natt_frag" processing. 416 * However, ipsec(4) interface's one is not done in the same way, 417 * so we must do NAT-T fragmentation by own code. 418 */ 419 /* NAT-T ESP fragmentation */ 420 mtu = ipsecif4_needfrag(m, sp->req); 421 if (mtu > 0) 422 return ipsecif4_fragout(var, family, m, mtu); 423 424 /* set NAT-T ports */ 425 error = ipsecif_set_natt_ports(var, m); 426 if (error) { 427 m_freem(m); 428 goto done; 429 } 430 431 /* IPsec output */ 432 IP_STATINC(IP_STAT_LOCALOUT); 433 error = ipsec4_process_packet(m, sp->req, &sa_mtu); 434 if (error == ENOENT) 435 error = 0; 436 /* 437 * frangmentation is already done in ipsecif4_fragout(), 438 * so ipsec4_process_packet() must not do fragmentation here. 439 */ 440 KASSERT(sa_mtu == 0); 441 442 done: 443 return error; 444 } 445 446 #ifdef INET6 447 int 448 ipsecif6_encap_func(struct mbuf *m, struct ip6_hdr *ip6, struct ipsec_variant *var) 449 { 450 struct m_tag *mtag; 451 struct sockaddr_in6 *src, *dst; 452 u_int16_t src_port = 0; 453 u_int16_t dst_port = 0; 454 455 KASSERT(var != NULL); 456 457 src = satosin6(var->iv_psrc); 458 dst = satosin6(var->iv_pdst); 459 mtag = m_tag_find(m, PACKET_TAG_IPSEC_NAT_T_PORTS); 460 if (mtag) { 461 u_int16_t *ports; 462 463 ports = (u_int16_t *)(mtag + 1); 464 src_port = ports[0]; 465 dst_port = ports[1]; 466 } 467 468 /* address match */ 469 if (!IN6_ARE_ADDR_EQUAL(&src->sin6_addr, &ip6->ip6_dst) || 470 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_src)) 471 return 0; 472 473 /* UDP encap? */ 474 if (mtag == NULL && var->iv_sport == 0 && var->iv_dport == 0) 475 goto match; 476 477 /* port match */ 478 if (src_port != var->iv_dport || 479 dst_port != var->iv_sport) { 480 #ifdef DEBUG 481 printf("%s: port mismatch: pkt(%u, %u), if(%u, %u)\n", 482 __func__, ntohs(src_port), ntohs(dst_port), 483 ntohs(var->iv_sport), ntohs(var->iv_dport)); 484 #endif 485 return 0; 486 } 487 488 match: 489 /* 490 * hide NAT-T information from encapsulated traffics. 491 * they don't know about IPsec. 492 */ 493 if (mtag) 494 m_tag_delete(m, mtag); 495 return sizeof(src->sin6_addr) + sizeof(dst->sin6_addr); 496 } 497 498 static int 499 ipsecif6_output(struct ipsec_variant *var, int family, struct mbuf *m) 500 { 501 struct ifnet *ifp = &var->iv_softc->ipsec_if; 502 struct ipsec_softc *sc = ifp->if_softc; 503 struct route *ro_pc; 504 kmutex_t *lock_pc; 505 struct rtentry *rt; 506 struct sockaddr_in6 *sin6_src; 507 struct sockaddr_in6 *sin6_dst; 508 struct ip6_hdr *ip6; 509 int proto, error, flags; 510 u_int8_t itos, otos; 511 union { 512 struct sockaddr dst; 513 struct sockaddr_in6 dst6; 514 } u; 515 516 KASSERT(if_ipsec_heldref_variant(var)); 517 KASSERT(if_ipsec_variant_is_configured(var)); 518 519 sin6_src = satosin6(var->iv_psrc); 520 sin6_dst = satosin6(var->iv_pdst); 521 522 KASSERT(sin6_src->sin6_family == AF_INET6); 523 KASSERT(sin6_dst->sin6_family == AF_INET6); 524 525 switch (family) { 526 #ifdef INET 527 case AF_INET: 528 { 529 struct ip *ip; 530 531 proto = IPPROTO_IPV4; 532 if (m->m_len < sizeof(*ip)) { 533 m = m_pullup(m, sizeof(*ip)); 534 if (m == NULL) 535 return ENOBUFS; 536 } 537 ip = mtod(m, struct ip *); 538 itos = ip->ip_tos; 539 /* TODO: support ALTQ for innner packet */ 540 break; 541 } 542 #endif /* INET */ 543 case AF_INET6: 544 { 545 struct ip6_hdr *xip6; 546 proto = IPPROTO_IPV6; 547 if (m->m_len < sizeof(*xip6)) { 548 m = m_pullup(m, sizeof(*xip6)); 549 if (m == NULL) 550 return ENOBUFS; 551 } 552 xip6 = mtod(m, struct ip6_hdr *); 553 itos = (ntohl(xip6->ip6_flow) >> 20) & 0xff; 554 /* TODO: support ALTQ for innner packet */ 555 break; 556 } 557 default: 558 m_freem(m); 559 return EAFNOSUPPORT; 560 } 561 562 /* prepend new IP header */ 563 M_PREPEND(m, sizeof(struct ip6_hdr), M_DONTWAIT); 564 if (m && M_UNWRITABLE(m, sizeof(struct ip6_hdr))) 565 m = m_pullup(m, sizeof(struct ip6_hdr)); 566 if (m == NULL) 567 return ENOBUFS; 568 569 ip6 = mtod(m, struct ip6_hdr *); 570 ip6->ip6_flow = 0; 571 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 572 ip6->ip6_vfc |= IPV6_VERSION; 573 #if 0 /* ip6->ip6_plen will be filled by ip6_output */ 574 ip6->ip6_plen = htons((u_short)m->m_pkthdr.len - sizeof(*ip6)); 575 #endif 576 ip6->ip6_nxt = proto; 577 ip6->ip6_hlim = ip6_ipsec_hlim; 578 ip6->ip6_src = sin6_src->sin6_addr; 579 /* bidirectional configured tunnel mode */ 580 if (!IN6_IS_ADDR_UNSPECIFIED(&sin6_dst->sin6_addr)) { 581 ip6->ip6_dst = sin6_dst->sin6_addr; 582 } else { 583 m_freem(m); 584 return ENETUNREACH; 585 } 586 #ifndef IPSEC_TX_TOS_CLEAR 587 if (!ip6_ipsec_copy_tos) 588 otos = 0; 589 590 if (ifp->if_flags & IFF_ECN) 591 ip_ecn_ingress(ECN_ALLOWED, &otos, &itos); 592 else 593 ip_ecn_ingress(ECN_NOCARE, &otos, &itos); 594 #else 595 if (ip6_ipsec_copy_tos) 596 otos = itos; 597 else 598 otos = 0; 599 #endif 600 ip6->ip6_flow &= ~ntohl(0xff00000); 601 ip6->ip6_flow |= htonl((u_int32_t)otos << 20); 602 603 sockaddr_in6_init(&u.dst6, &sin6_dst->sin6_addr, 0, 0, 0); 604 605 if_tunnel_get_ro(sc->ipsec_ro_percpu, &ro_pc, &lock_pc); 606 if ((rt = rtcache_lookup(ro_pc, &u.dst)) == NULL) { 607 if_tunnel_put_ro(sc->ipsec_ro_percpu, lock_pc); 608 m_freem(m); 609 return ENETUNREACH; 610 } 611 612 if (rt->rt_ifp == ifp) { 613 rtcache_unref(rt, ro_pc); 614 rtcache_free(ro_pc); 615 if_tunnel_put_ro(sc->ipsec_ro_percpu, lock_pc); 616 m_freem(m); 617 return ENETUNREACH; 618 } 619 rtcache_unref(rt, ro_pc); 620 621 /* set NAT-T ports */ 622 error = ipsecif_set_natt_ports(var, m); 623 if (error) { 624 m_freem(m); 625 goto out; 626 } 627 628 /* 629 * - IPSEC_PMTU_MINMTU 630 * Force fragmentation to minimum MTU to avoid path MTU discovery 631 * - IPSEC_PMTU_OUTERMTU 632 * Trust outer MTU is large enough to send all packets 633 * 634 * It is too painful to ask for resend of inner packet, to achieve 635 * path MTU discovery for encapsulated packets. 636 * 637 * See RFC4459. 638 */ 639 if (sc->ipsec_pmtu == IPSEC_PMTU_SYSDEFAULT) { 640 switch (ip6_ipsec_pmtu) { 641 case IPSEC_PMTU_MINMTU: 642 flags = IPV6_MINMTU; 643 break; 644 case IPSEC_PMTU_OUTERMTU: 645 flags = 0; 646 break; 647 default: 648 #ifdef DEBUG 649 log(LOG_DEBUG, "%s: ignore unexpected ip6_ipsec_pmtu %d\n", 650 __func__, ip6_ipsec_pmtu); 651 #endif 652 flags = IPV6_MINMTU; 653 break; 654 } 655 } else { 656 switch (sc->ipsec_pmtu) { 657 case IPSEC_PMTU_MINMTU: 658 flags = IPV6_MINMTU; 659 break; 660 case IPSEC_PMTU_OUTERMTU: 661 flags = 0; 662 break; 663 default: 664 #ifdef DEBUG 665 log(LOG_DEBUG, "%s: ignore unexpected ipsec_pmtu of %s %d\n", 666 __func__, ifp->if_xname, sc->ipsec_pmtu); 667 #endif 668 flags = IPV6_MINMTU; 669 break; 670 } 671 } 672 error = ip6_output(m, 0, ro_pc, flags, 0, NULL, NULL); 673 674 out: 675 if (error) 676 rtcache_free(ro_pc); 677 if_tunnel_put_ro(sc->ipsec_ro_percpu, lock_pc); 678 679 return error; 680 } 681 #endif /* INET6 */ 682 683 static void 684 ipsecif4_input(struct mbuf *m, int off, int proto, void *eparg) 685 { 686 struct ifnet *ipsecp; 687 struct ipsec_softc *sc = eparg; 688 struct ipsec_variant *var; 689 const struct ip *ip; 690 int af; 691 #ifndef IPSEC_TX_TOS_CLEAR 692 u_int8_t otos; 693 #endif 694 struct psref psref_rcvif; 695 struct psref psref_var; 696 struct ifnet *rcvif; 697 698 KASSERT(sc != NULL); 699 700 ipsecp = &sc->ipsec_if; 701 if ((ipsecp->if_flags & IFF_UP) == 0) { 702 m_freem(m); 703 ip_statinc(IP_STAT_NOIPSEC); 704 return; 705 } 706 707 var = if_ipsec_getref_variant(sc, &psref_var); 708 if (if_ipsec_variant_is_unconfigured(var)) { 709 if_ipsec_putref_variant(var, &psref_var); 710 m_freem(m); 711 ip_statinc(IP_STAT_NOIPSEC); 712 return; 713 } 714 715 ip = mtod(m, const struct ip *); 716 717 rcvif = m_get_rcvif_psref(m, &psref_rcvif); 718 if (rcvif == NULL || !ipsecif4_filter4(ip, var, rcvif)) { 719 m_put_rcvif_psref(rcvif, &psref_rcvif); 720 if_ipsec_putref_variant(var, &psref_var); 721 m_freem(m); 722 ip_statinc(IP_STAT_NOIPSEC); 723 return; 724 } 725 m_put_rcvif_psref(rcvif, &psref_rcvif); 726 if_ipsec_putref_variant(var, &psref_var); 727 #ifndef IPSEC_TX_TOS_CLEAR 728 otos = ip->ip_tos; 729 #endif 730 m_adj(m, off); 731 732 switch (proto) { 733 case IPPROTO_IPV4: 734 { 735 struct ip *xip; 736 af = AF_INET; 737 if (M_UNWRITABLE(m, sizeof(*xip))) { 738 m = m_pullup(m, sizeof(*xip)); 739 if (m == NULL) 740 return; 741 } 742 xip = mtod(m, struct ip *); 743 #ifndef IPSEC_TX_TOS_CLEAR 744 if (ipsecp->if_flags & IFF_ECN) 745 ip_ecn_egress(ECN_ALLOWED, &otos, &xip->ip_tos); 746 else 747 ip_ecn_egress(ECN_NOCARE, &otos, &xip->ip_tos); 748 #endif 749 break; 750 } 751 #ifdef INET6 752 case IPPROTO_IPV6: 753 { 754 struct ip6_hdr *ip6; 755 u_int8_t itos; 756 af = AF_INET6; 757 if (M_UNWRITABLE(m, sizeof(*ip6))) { 758 m = m_pullup(m, sizeof(*ip6)); 759 if (m == NULL) 760 return; 761 } 762 ip6 = mtod(m, struct ip6_hdr *); 763 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 764 #ifndef IPSEC_TX_TOS_CLEAR 765 if (ipsecp->if_flags & IFF_ECN) 766 ip_ecn_egress(ECN_ALLOWED, &otos, &itos); 767 else 768 ip_ecn_egress(ECN_NOCARE, &otos, &itos); 769 #endif 770 ip6->ip6_flow &= ~htonl(0xff << 20); 771 ip6->ip6_flow |= htonl((u_int32_t)itos << 20); 772 break; 773 } 774 #endif /* INET6 */ 775 default: 776 ip_statinc(IP_STAT_NOIPSEC); 777 m_freem(m); 778 return; 779 } 780 if_ipsec_input(m, af, ipsecp); 781 782 return; 783 } 784 785 /* 786 * validate and filter the packet 787 */ 788 static int 789 ipsecif4_filter4(const struct ip *ip, struct ipsec_variant *var, 790 struct ifnet *ifp) 791 { 792 struct sockaddr_in *src, *dst; 793 794 src = satosin(var->iv_psrc); 795 dst = satosin(var->iv_pdst); 796 797 return in_tunnel_validate(ip, src->sin_addr, dst->sin_addr); 798 } 799 800 #ifdef INET6 801 static int 802 ipsecif6_input(struct mbuf **mp, int *offp, int proto, void *eparg) 803 { 804 struct mbuf *m = *mp; 805 struct ifnet *ipsecp; 806 struct ipsec_softc *sc = eparg; 807 struct ipsec_variant *var; 808 struct ip6_hdr *ip6; 809 int af = 0; 810 #ifndef IPSEC_TX_TOS_CLEAR 811 u_int32_t otos; 812 #endif 813 struct psref psref_rcvif; 814 struct psref psref_var; 815 struct ifnet *rcvif; 816 817 KASSERT(eparg != NULL); 818 819 ipsecp = &sc->ipsec_if; 820 if ((ipsecp->if_flags & IFF_UP) == 0) { 821 m_freem(m); 822 IP6_STATINC(IP6_STAT_NOIPSEC); 823 return IPPROTO_DONE; 824 } 825 826 var = if_ipsec_getref_variant(sc, &psref_var); 827 if (if_ipsec_variant_is_unconfigured(var)) { 828 if_ipsec_putref_variant(var, &psref_var); 829 m_freem(m); 830 IP6_STATINC(IP6_STAT_NOIPSEC); 831 return IPPROTO_DONE; 832 } 833 834 ip6 = mtod(m, struct ip6_hdr *); 835 836 rcvif = m_get_rcvif_psref(m, &psref_rcvif); 837 if (rcvif == NULL || !ipsecif6_filter6(ip6, var, rcvif)) { 838 m_put_rcvif_psref(rcvif, &psref_rcvif); 839 if_ipsec_putref_variant(var, &psref_var); 840 m_freem(m); 841 IP6_STATINC(IP6_STAT_NOIPSEC); 842 return IPPROTO_DONE; 843 } 844 m_put_rcvif_psref(rcvif, &psref_rcvif); 845 if_ipsec_putref_variant(var, &psref_var); 846 847 #ifndef IPSEC_TX_TOS_CLEAR 848 otos = ip6->ip6_flow; 849 #endif 850 m_adj(m, *offp); 851 852 switch (proto) { 853 #ifdef INET 854 case IPPROTO_IPV4: 855 { 856 af = AF_INET; 857 #ifndef IPSEC_TX_TOS_CLEAR 858 struct ip *ip; 859 u_int8_t otos8; 860 otos8 = (ntohl(otos) >> 20) & 0xff; 861 862 if (M_UNWRITABLE(m, sizeof(*ip))) { 863 m = m_pullup(m, sizeof(*ip)); 864 if (m == NULL) 865 return IPPROTO_DONE; 866 } 867 ip = mtod(m, struct ip *); 868 if (ipsecp->if_flags & IFF_ECN) 869 ip_ecn_egress(ECN_ALLOWED, &otos8, &ip->ip_tos); 870 else 871 ip_ecn_egress(ECN_NOCARE, &otos8, &ip->ip_tos); 872 #endif 873 break; 874 } 875 #endif /* INET */ 876 case IPPROTO_IPV6: 877 { 878 af = AF_INET6; 879 #ifndef IPSEC_TX_TOS_CLEAR 880 struct ip6_hdr *xip6; 881 882 if (M_UNWRITABLE(m, sizeof(*xip6))) { 883 m = m_pullup(m, sizeof(*xip6)); 884 if (m == NULL) 885 return IPPROTO_DONE; 886 } 887 xip6 = mtod(m, struct ip6_hdr *); 888 if (ipsecp->if_flags & IFF_ECN) 889 ip6_ecn_egress(ECN_ALLOWED, &otos, &xip6->ip6_flow); 890 else 891 ip6_ecn_egress(ECN_NOCARE, &otos, &xip6->ip6_flow); 892 break; 893 #endif 894 } 895 default: 896 IP6_STATINC(IP6_STAT_NOIPSEC); 897 m_freem(m); 898 return IPPROTO_DONE; 899 } 900 901 if_ipsec_input(m, af, ipsecp); 902 return IPPROTO_DONE; 903 } 904 905 /* 906 * validate and filter the packet. 907 */ 908 static int 909 ipsecif6_filter6(const struct ip6_hdr *ip6, struct ipsec_variant *var, 910 struct ifnet *ifp) 911 { 912 struct sockaddr_in6 *src, *dst; 913 914 src = satosin6(var->iv_psrc); 915 dst = satosin6(var->iv_pdst); 916 917 return in6_tunnel_validate(ip6, &src->sin6_addr, &dst->sin6_addr); 918 } 919 #endif /* INET6 */ 920 921 int 922 ipsecif4_attach(struct ipsec_variant *var) 923 { 924 struct ipsec_softc *sc = var->iv_softc; 925 926 KASSERT(if_ipsec_variant_is_configured(var)); 927 928 if (var->iv_encap_cookie4 != NULL) 929 return EALREADY; 930 var->iv_encap_cookie4 = encap_attach_func(AF_INET, -1, if_ipsec_encap_func, 931 &ipsecif4_encapsw, sc); 932 if (var->iv_encap_cookie4 == NULL) 933 return EEXIST; 934 935 var->iv_output = ipsecif4_output; 936 return 0; 937 } 938 939 int 940 ipsecif4_detach(struct ipsec_variant *var) 941 { 942 int error; 943 944 if (var->iv_encap_cookie4 == NULL) 945 return 0; 946 947 var->iv_output = NULL; 948 error = encap_detach(var->iv_encap_cookie4); 949 if (error == 0) 950 var->iv_encap_cookie4 = NULL; 951 952 return error; 953 } 954 955 #ifdef INET6 956 int 957 ipsecif6_attach(struct ipsec_variant *var) 958 { 959 struct ipsec_softc *sc = var->iv_softc; 960 961 KASSERT(if_ipsec_variant_is_configured(var)); 962 KASSERT(var->iv_encap_cookie6 == NULL); 963 964 var->iv_encap_cookie6 = encap_attach_func(AF_INET6, -1, if_ipsec_encap_func, 965 &ipsecif6_encapsw, sc); 966 if (var->iv_encap_cookie6 == NULL) 967 return EEXIST; 968 969 var->iv_output = ipsecif6_output; 970 return 0; 971 } 972 973 int 974 ipsecif6_detach(struct ipsec_variant *var) 975 { 976 struct ipsec_softc *sc = var->iv_softc; 977 int error; 978 979 KASSERT(var->iv_encap_cookie6 != NULL); 980 981 if_tunnel_ro_percpu_rtcache_free(sc->ipsec_ro_percpu); 982 983 var->iv_output = NULL; 984 error = encap_detach(var->iv_encap_cookie6); 985 if (error == 0) 986 var->iv_encap_cookie6 = NULL; 987 return error; 988 } 989 990 void * 991 ipsecif6_ctlinput(int cmd, const struct sockaddr *sa, void *d, void *eparg) 992 { 993 struct ipsec_softc *sc = eparg; 994 struct ip6ctlparam *ip6cp = NULL; 995 struct ip6_hdr *ip6; 996 const struct sockaddr_in6 *dst6; 997 struct route *ro_pc; 998 kmutex_t *lock_pc; 999 1000 if (sa->sa_family != AF_INET6 || 1001 sa->sa_len != sizeof(struct sockaddr_in6)) 1002 return NULL; 1003 1004 if ((unsigned)cmd >= PRC_NCMDS) 1005 return NULL; 1006 if (cmd == PRC_HOSTDEAD) 1007 d = NULL; 1008 else if (inet6ctlerrmap[cmd] == 0) 1009 return NULL; 1010 1011 /* if the parameter is from icmp6, decode it. */ 1012 if (d != NULL) { 1013 ip6cp = (struct ip6ctlparam *)d; 1014 ip6 = ip6cp->ip6c_ip6; 1015 } else { 1016 ip6 = NULL; 1017 } 1018 1019 if (!ip6) 1020 return NULL; 1021 1022 if_tunnel_get_ro(sc->ipsec_ro_percpu, &ro_pc, &lock_pc); 1023 dst6 = satocsin6(rtcache_getdst(ro_pc)); 1024 /* XXX scope */ 1025 if (dst6 == NULL) 1026 ; 1027 else if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &dst6->sin6_addr)) 1028 /* flush route cache */ 1029 rtcache_free(ro_pc); 1030 1031 if_tunnel_put_ro(sc->ipsec_ro_percpu, lock_pc); 1032 1033 return NULL; 1034 } 1035 1036 ENCAP_PR_WRAP_CTLINPUT(ipsecif6_ctlinput) 1037 #define ipsecif6_ctlinput ipsecif6_ctlinput_wrapper 1038 1039 static const struct encapsw ipsecif6_encapsw = { 1040 .encapsw6 = { 1041 .pr_input = ipsecif6_input, 1042 .pr_ctlinput = ipsecif6_ctlinput, 1043 } 1044 }; 1045 #endif /* INET6 */ 1046