ipsecif.c revision 1.16.2.2
1 /* $NetBSD: ipsecif.c,v 1.16.2.2 2020/01/31 11:30:24 martin 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 1.16.2.2 2020/01/31 11:30:24 martin 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 static int ip6_ipsec_hlim = IPSEC_HLIM; 91 static int ip6_ipsec_pmtu = 0; /* XXX: per interface configuration?? */ 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 switch (family) { 384 case AF_INET: 385 sp = IV_SP_OUT(var); 386 break; 387 case AF_INET6: 388 sp = IV_SP_OUT6(var); 389 break; 390 default: 391 m_freem(m); 392 return EAFNOSUPPORT; 393 } 394 KASSERT(sp != NULL); 395 /* 396 * The SPs in ipsec_variant are prevented from freed by 397 * ipsec_variant->iv_psref. So, KEY_SP_REF() is unnecessary here. 398 */ 399 400 KASSERT(sp->policy != IPSEC_POLICY_NONE); 401 KASSERT(sp->policy != IPSEC_POLICY_ENTRUST); 402 KASSERT(sp->policy != IPSEC_POLICY_BYPASS); 403 if (sp->policy != IPSEC_POLICY_IPSEC) { 404 m_freem(m); 405 error = ENETUNREACH; 406 goto done; 407 } 408 409 /* get flowinfo */ 410 m = ipsecif4_flowinfo(m, family, &proto, &tos); 411 if (m == NULL) { 412 error = ENETUNREACH; 413 goto done; 414 } 415 416 /* prepend new IP header */ 417 m = ipsecif4_prepend_hdr(var, m, proto, tos); 418 if (m == NULL) { 419 error = ENETUNREACH; 420 goto done; 421 } 422 423 /* 424 * Normal netipsec's NAT-T fragmentation is done in ip_output(). 425 * See "natt_frag" processing. 426 * However, ipsec(4) interface's one is not done in the same way, 427 * so we must do NAT-T fragmentation by own code. 428 */ 429 /* NAT-T ESP fragmentation */ 430 mtu = ipsecif4_needfrag(m, sp->req); 431 if (mtu > 0) 432 return ipsecif4_fragout(var, family, m, mtu); 433 434 /* set NAT-T ports */ 435 error = ipsecif_set_natt_ports(var, m); 436 if (error) { 437 m_freem(m); 438 goto done; 439 } 440 441 /* IPsec output */ 442 IP_STATINC(IP_STAT_LOCALOUT); 443 error = ipsec4_process_packet(m, sp->req, &sa_mtu); 444 if (error == ENOENT) 445 error = 0; 446 /* 447 * frangmentation is already done in ipsecif4_fragout(), 448 * so ipsec4_process_packet() must not do fragmentation here. 449 */ 450 KASSERT(sa_mtu == 0); 451 452 done: 453 return error; 454 } 455 456 #ifdef INET6 457 int 458 ipsecif6_encap_func(struct mbuf *m, struct ip6_hdr *ip6, struct ipsec_variant *var) 459 { 460 struct m_tag *mtag; 461 struct sockaddr_in6 *src, *dst; 462 u_int16_t src_port = 0; 463 u_int16_t dst_port = 0; 464 465 KASSERT(var != NULL); 466 467 src = satosin6(var->iv_psrc); 468 dst = satosin6(var->iv_pdst); 469 mtag = m_tag_find(m, PACKET_TAG_IPSEC_NAT_T_PORTS); 470 if (mtag) { 471 u_int16_t *ports; 472 473 ports = (u_int16_t *)(mtag + 1); 474 src_port = ports[0]; 475 dst_port = ports[1]; 476 } 477 478 /* address match */ 479 if (!IN6_ARE_ADDR_EQUAL(&src->sin6_addr, &ip6->ip6_dst) || 480 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_src)) 481 return 0; 482 483 /* UDP encap? */ 484 if (mtag == NULL && var->iv_sport == 0 && var->iv_dport == 0) 485 goto match; 486 487 /* port match */ 488 if (src_port != var->iv_dport || 489 dst_port != var->iv_sport) { 490 #ifdef DEBUG 491 printf("%s: port mismatch: pkt(%u, %u), if(%u, %u)\n", 492 __func__, ntohs(src_port), ntohs(dst_port), 493 ntohs(var->iv_sport), ntohs(var->iv_dport)); 494 #endif 495 return 0; 496 } 497 498 match: 499 /* 500 * hide NAT-T information from encapsulated traffics. 501 * they don't know about IPsec. 502 */ 503 if (mtag) 504 m_tag_delete(m, mtag); 505 return sizeof(src->sin6_addr) + sizeof(dst->sin6_addr); 506 } 507 508 static int 509 ipsecif6_output(struct ipsec_variant *var, int family, struct mbuf *m) 510 { 511 struct ifnet *ifp = &var->iv_softc->ipsec_if; 512 struct ipsec_softc *sc = ifp->if_softc; 513 struct route *ro_pc; 514 kmutex_t *lock_pc; 515 struct rtentry *rt; 516 struct sockaddr_in6 *sin6_src; 517 struct sockaddr_in6 *sin6_dst; 518 struct ip6_hdr *ip6; 519 int proto, error; 520 u_int8_t itos, otos; 521 union { 522 struct sockaddr dst; 523 struct sockaddr_in6 dst6; 524 } u; 525 526 KASSERT(if_ipsec_heldref_variant(var)); 527 KASSERT(if_ipsec_variant_is_configured(var)); 528 529 sin6_src = satosin6(var->iv_psrc); 530 sin6_dst = satosin6(var->iv_pdst); 531 532 KASSERT(sin6_src->sin6_family == AF_INET6); 533 KASSERT(sin6_dst->sin6_family == AF_INET6); 534 535 switch (family) { 536 #ifdef INET 537 case AF_INET: 538 { 539 struct ip *ip; 540 541 proto = IPPROTO_IPV4; 542 if (m->m_len < sizeof(*ip)) { 543 m = m_pullup(m, sizeof(*ip)); 544 if (m == NULL) 545 return ENOBUFS; 546 } 547 ip = mtod(m, struct ip *); 548 itos = ip->ip_tos; 549 /* TODO: support ALTQ for innner packet */ 550 break; 551 } 552 #endif /* INET */ 553 case AF_INET6: 554 { 555 struct ip6_hdr *xip6; 556 proto = IPPROTO_IPV6; 557 if (m->m_len < sizeof(*xip6)) { 558 m = m_pullup(m, sizeof(*xip6)); 559 if (m == NULL) 560 return ENOBUFS; 561 } 562 xip6 = mtod(m, struct ip6_hdr *); 563 itos = (ntohl(xip6->ip6_flow) >> 20) & 0xff; 564 /* TODO: support ALTQ for innner packet */ 565 break; 566 } 567 default: 568 m_freem(m); 569 return EAFNOSUPPORT; 570 } 571 572 /* prepend new IP header */ 573 M_PREPEND(m, sizeof(struct ip6_hdr), M_DONTWAIT); 574 if (m && M_UNWRITABLE(m, sizeof(struct ip6_hdr))) 575 m = m_pullup(m, sizeof(struct ip6_hdr)); 576 if (m == NULL) 577 return ENOBUFS; 578 579 ip6 = mtod(m, struct ip6_hdr *); 580 ip6->ip6_flow = 0; 581 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 582 ip6->ip6_vfc |= IPV6_VERSION; 583 #if 0 /* ip6->ip6_plen will be filled by ip6_output */ 584 ip6->ip6_plen = htons((u_short)m->m_pkthdr.len - sizeof(*ip6)); 585 #endif 586 ip6->ip6_nxt = proto; 587 ip6->ip6_hlim = ip6_ipsec_hlim; 588 ip6->ip6_src = sin6_src->sin6_addr; 589 /* bidirectional configured tunnel mode */ 590 if (!IN6_IS_ADDR_UNSPECIFIED(&sin6_dst->sin6_addr)) { 591 ip6->ip6_dst = sin6_dst->sin6_addr; 592 } else { 593 m_freem(m); 594 return ENETUNREACH; 595 } 596 #ifndef IPSEC_TX_TOS_CLEAR 597 if (!ip6_ipsec_copy_tos) 598 otos = 0; 599 600 if (ifp->if_flags & IFF_ECN) 601 ip_ecn_ingress(ECN_ALLOWED, &otos, &itos); 602 else 603 ip_ecn_ingress(ECN_NOCARE, &otos, &itos); 604 #else 605 if (ip6_ipsec_copy_tos) 606 otos = itos; 607 else 608 otos = 0; 609 #endif 610 ip6->ip6_flow &= ~ntohl(0xff00000); 611 ip6->ip6_flow |= htonl((u_int32_t)otos << 20); 612 613 sockaddr_in6_init(&u.dst6, &sin6_dst->sin6_addr, 0, 0, 0); 614 615 if_tunnel_get_ro(sc->ipsec_ro_percpu, &ro_pc, &lock_pc); 616 if ((rt = rtcache_lookup(ro_pc, &u.dst)) == NULL) { 617 if_tunnel_put_ro(sc->ipsec_ro_percpu, lock_pc); 618 m_freem(m); 619 return ENETUNREACH; 620 } 621 622 if (rt->rt_ifp == ifp) { 623 rtcache_unref(rt, ro_pc); 624 rtcache_free(ro_pc); 625 if_tunnel_put_ro(sc->ipsec_ro_percpu, lock_pc); 626 m_freem(m); 627 return ENETUNREACH; 628 } 629 rtcache_unref(rt, ro_pc); 630 631 /* set NAT-T ports */ 632 error = ipsecif_set_natt_ports(var, m); 633 if (error) { 634 m_freem(m); 635 goto out; 636 } 637 638 /* 639 * force fragmentation to minimum MTU, to avoid path MTU discovery. 640 * it is too painful to ask for resend of inner packet, to achieve 641 * path MTU discovery for encapsulated packets. 642 */ 643 error = ip6_output(m, 0, ro_pc, 644 ip6_ipsec_pmtu ? 0 : IPV6_MINMTU, 0, NULL, NULL); 645 646 out: 647 if (error) 648 rtcache_free(ro_pc); 649 if_tunnel_put_ro(sc->ipsec_ro_percpu, lock_pc); 650 651 return error; 652 } 653 #endif /* INET6 */ 654 655 static void 656 ipsecif4_input(struct mbuf *m, int off, int proto, void *eparg) 657 { 658 struct ifnet *ipsecp; 659 struct ipsec_softc *sc = eparg; 660 struct ipsec_variant *var; 661 const struct ip *ip; 662 int af; 663 #ifndef IPSEC_TX_TOS_CLEAR 664 u_int8_t otos; 665 #endif 666 struct psref psref_rcvif; 667 struct psref psref_var; 668 struct ifnet *rcvif; 669 670 KASSERT(sc != NULL); 671 672 ipsecp = &sc->ipsec_if; 673 if ((ipsecp->if_flags & IFF_UP) == 0) { 674 m_freem(m); 675 ip_statinc(IP_STAT_NOIPSEC); 676 return; 677 } 678 679 var = if_ipsec_getref_variant(sc, &psref_var); 680 if (if_ipsec_variant_is_unconfigured(var)) { 681 if_ipsec_putref_variant(var, &psref_var); 682 m_freem(m); 683 ip_statinc(IP_STAT_NOIPSEC); 684 return; 685 } 686 687 ip = mtod(m, const struct ip *); 688 689 rcvif = m_get_rcvif_psref(m, &psref_rcvif); 690 if (rcvif == NULL || !ipsecif4_filter4(ip, var, rcvif)) { 691 m_put_rcvif_psref(rcvif, &psref_rcvif); 692 if_ipsec_putref_variant(var, &psref_var); 693 m_freem(m); 694 ip_statinc(IP_STAT_NOIPSEC); 695 return; 696 } 697 m_put_rcvif_psref(rcvif, &psref_rcvif); 698 if_ipsec_putref_variant(var, &psref_var); 699 #ifndef IPSEC_TX_TOS_CLEAR 700 otos = ip->ip_tos; 701 #endif 702 m_adj(m, off); 703 704 switch (proto) { 705 case IPPROTO_IPV4: 706 { 707 struct ip *xip; 708 af = AF_INET; 709 if (M_UNWRITABLE(m, sizeof(*xip))) { 710 m = m_pullup(m, sizeof(*xip)); 711 if (m == NULL) 712 return; 713 } 714 xip = mtod(m, struct ip *); 715 #ifndef IPSEC_TX_TOS_CLEAR 716 if (ipsecp->if_flags & IFF_ECN) 717 ip_ecn_egress(ECN_ALLOWED, &otos, &xip->ip_tos); 718 else 719 ip_ecn_egress(ECN_NOCARE, &otos, &xip->ip_tos); 720 #endif 721 break; 722 } 723 #ifdef INET6 724 case IPPROTO_IPV6: 725 { 726 struct ip6_hdr *ip6; 727 u_int8_t itos; 728 af = AF_INET6; 729 if (M_UNWRITABLE(m, sizeof(*ip6))) { 730 m = m_pullup(m, sizeof(*ip6)); 731 if (m == NULL) 732 return; 733 } 734 ip6 = mtod(m, struct ip6_hdr *); 735 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 736 #ifndef IPSEC_TX_TOS_CLEAR 737 if (ipsecp->if_flags & IFF_ECN) 738 ip_ecn_egress(ECN_ALLOWED, &otos, &itos); 739 else 740 ip_ecn_egress(ECN_NOCARE, &otos, &itos); 741 #endif 742 ip6->ip6_flow &= ~htonl(0xff << 20); 743 ip6->ip6_flow |= htonl((u_int32_t)itos << 20); 744 break; 745 } 746 #endif /* INET6 */ 747 default: 748 ip_statinc(IP_STAT_NOIPSEC); 749 m_freem(m); 750 return; 751 } 752 if_ipsec_input(m, af, ipsecp); 753 754 return; 755 } 756 757 /* 758 * validate and filter the packet 759 */ 760 static int 761 ipsecif4_filter4(const struct ip *ip, struct ipsec_variant *var, 762 struct ifnet *ifp) 763 { 764 struct sockaddr_in *src, *dst; 765 766 src = satosin(var->iv_psrc); 767 dst = satosin(var->iv_pdst); 768 769 return in_tunnel_validate(ip, src->sin_addr, dst->sin_addr); 770 } 771 772 #ifdef INET6 773 static int 774 ipsecif6_input(struct mbuf **mp, int *offp, int proto, void *eparg) 775 { 776 struct mbuf *m = *mp; 777 struct ifnet *ipsecp; 778 struct ipsec_softc *sc = eparg; 779 struct ipsec_variant *var; 780 struct ip6_hdr *ip6; 781 int af = 0; 782 #ifndef IPSEC_TX_TOS_CLEAR 783 u_int32_t otos; 784 #endif 785 struct psref psref_rcvif; 786 struct psref psref_var; 787 struct ifnet *rcvif; 788 789 KASSERT(eparg != NULL); 790 791 ipsecp = &sc->ipsec_if; 792 if ((ipsecp->if_flags & IFF_UP) == 0) { 793 m_freem(m); 794 IP6_STATINC(IP6_STAT_NOIPSEC); 795 return IPPROTO_DONE; 796 } 797 798 var = if_ipsec_getref_variant(sc, &psref_var); 799 if (if_ipsec_variant_is_unconfigured(var)) { 800 if_ipsec_putref_variant(var, &psref_var); 801 m_freem(m); 802 IP6_STATINC(IP6_STAT_NOIPSEC); 803 return IPPROTO_DONE; 804 } 805 806 ip6 = mtod(m, struct ip6_hdr *); 807 808 rcvif = m_get_rcvif_psref(m, &psref_rcvif); 809 if (rcvif == NULL || !ipsecif6_filter6(ip6, var, rcvif)) { 810 m_put_rcvif_psref(rcvif, &psref_rcvif); 811 if_ipsec_putref_variant(var, &psref_var); 812 m_freem(m); 813 IP6_STATINC(IP6_STAT_NOIPSEC); 814 return IPPROTO_DONE; 815 } 816 m_put_rcvif_psref(rcvif, &psref_rcvif); 817 if_ipsec_putref_variant(var, &psref_var); 818 819 #ifndef IPSEC_TX_TOS_CLEAR 820 otos = ip6->ip6_flow; 821 #endif 822 m_adj(m, *offp); 823 824 switch (proto) { 825 #ifdef INET 826 case IPPROTO_IPV4: 827 { 828 af = AF_INET; 829 #ifndef IPSEC_TX_TOS_CLEAR 830 struct ip *ip; 831 u_int8_t otos8; 832 otos8 = (ntohl(otos) >> 20) & 0xff; 833 834 if (M_UNWRITABLE(m, sizeof(*ip))) { 835 m = m_pullup(m, sizeof(*ip)); 836 if (m == NULL) 837 return IPPROTO_DONE; 838 } 839 ip = mtod(m, struct ip *); 840 if (ipsecp->if_flags & IFF_ECN) 841 ip_ecn_egress(ECN_ALLOWED, &otos8, &ip->ip_tos); 842 else 843 ip_ecn_egress(ECN_NOCARE, &otos8, &ip->ip_tos); 844 #endif 845 break; 846 } 847 #endif /* INET */ 848 case IPPROTO_IPV6: 849 { 850 af = AF_INET6; 851 #ifndef IPSEC_TX_TOS_CLEAR 852 struct ip6_hdr *xip6; 853 854 if (M_UNWRITABLE(m, sizeof(*xip6))) { 855 m = m_pullup(m, sizeof(*xip6)); 856 if (m == NULL) 857 return IPPROTO_DONE; 858 } 859 xip6 = mtod(m, struct ip6_hdr *); 860 if (ipsecp->if_flags & IFF_ECN) 861 ip6_ecn_egress(ECN_ALLOWED, &otos, &xip6->ip6_flow); 862 else 863 ip6_ecn_egress(ECN_NOCARE, &otos, &xip6->ip6_flow); 864 break; 865 #endif 866 } 867 default: 868 IP6_STATINC(IP6_STAT_NOIPSEC); 869 m_freem(m); 870 return IPPROTO_DONE; 871 } 872 873 if_ipsec_input(m, af, ipsecp); 874 return IPPROTO_DONE; 875 } 876 877 /* 878 * validate and filter the packet. 879 */ 880 static int 881 ipsecif6_filter6(const struct ip6_hdr *ip6, struct ipsec_variant *var, 882 struct ifnet *ifp) 883 { 884 struct sockaddr_in6 *src, *dst; 885 886 src = satosin6(var->iv_psrc); 887 dst = satosin6(var->iv_pdst); 888 889 return in6_tunnel_validate(ip6, &src->sin6_addr, &dst->sin6_addr); 890 } 891 #endif /* INET6 */ 892 893 int 894 ipsecif4_attach(struct ipsec_variant *var) 895 { 896 struct ipsec_softc *sc = var->iv_softc; 897 898 KASSERT(if_ipsec_variant_is_configured(var)); 899 900 if (var->iv_encap_cookie4 != NULL) 901 return EALREADY; 902 var->iv_encap_cookie4 = encap_attach_func(AF_INET, -1, if_ipsec_encap_func, 903 &ipsecif4_encapsw, sc); 904 if (var->iv_encap_cookie4 == NULL) 905 return EEXIST; 906 907 var->iv_output = ipsecif4_output; 908 return 0; 909 } 910 911 int 912 ipsecif4_detach(struct ipsec_variant *var) 913 { 914 int error; 915 916 if (var->iv_encap_cookie4 == NULL) 917 return 0; 918 919 var->iv_output = NULL; 920 error = encap_detach(var->iv_encap_cookie4); 921 if (error == 0) 922 var->iv_encap_cookie4 = NULL; 923 924 return error; 925 } 926 927 #ifdef INET6 928 int 929 ipsecif6_attach(struct ipsec_variant *var) 930 { 931 struct ipsec_softc *sc = var->iv_softc; 932 933 KASSERT(if_ipsec_variant_is_configured(var)); 934 KASSERT(var->iv_encap_cookie6 == NULL); 935 936 var->iv_encap_cookie6 = encap_attach_func(AF_INET6, -1, if_ipsec_encap_func, 937 &ipsecif6_encapsw, sc); 938 if (var->iv_encap_cookie6 == NULL) 939 return EEXIST; 940 941 var->iv_output = ipsecif6_output; 942 return 0; 943 } 944 945 int 946 ipsecif6_detach(struct ipsec_variant *var) 947 { 948 struct ipsec_softc *sc = var->iv_softc; 949 int error; 950 951 KASSERT(var->iv_encap_cookie6 != NULL); 952 953 if_tunnel_ro_percpu_rtcache_free(sc->ipsec_ro_percpu); 954 955 var->iv_output = NULL; 956 error = encap_detach(var->iv_encap_cookie6); 957 if (error == 0) 958 var->iv_encap_cookie6 = NULL; 959 return error; 960 } 961 962 void * 963 ipsecif6_ctlinput(int cmd, const struct sockaddr *sa, void *d, void *eparg) 964 { 965 struct ipsec_softc *sc = eparg; 966 struct ip6ctlparam *ip6cp = NULL; 967 struct ip6_hdr *ip6; 968 const struct sockaddr_in6 *dst6; 969 struct route *ro_pc; 970 kmutex_t *lock_pc; 971 972 if (sa->sa_family != AF_INET6 || 973 sa->sa_len != sizeof(struct sockaddr_in6)) 974 return NULL; 975 976 if ((unsigned)cmd >= PRC_NCMDS) 977 return NULL; 978 if (cmd == PRC_HOSTDEAD) 979 d = NULL; 980 else if (inet6ctlerrmap[cmd] == 0) 981 return NULL; 982 983 /* if the parameter is from icmp6, decode it. */ 984 if (d != NULL) { 985 ip6cp = (struct ip6ctlparam *)d; 986 ip6 = ip6cp->ip6c_ip6; 987 } else { 988 ip6 = NULL; 989 } 990 991 if (!ip6) 992 return NULL; 993 994 if_tunnel_get_ro(sc->ipsec_ro_percpu, &ro_pc, &lock_pc); 995 dst6 = satocsin6(rtcache_getdst(ro_pc)); 996 /* XXX scope */ 997 if (dst6 == NULL) 998 ; 999 else if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &dst6->sin6_addr)) 1000 /* flush route cache */ 1001 rtcache_free(ro_pc); 1002 1003 if_tunnel_put_ro(sc->ipsec_ro_percpu, lock_pc); 1004 1005 return NULL; 1006 } 1007 1008 ENCAP_PR_WRAP_CTLINPUT(ipsecif6_ctlinput) 1009 #define ipsecif6_ctlinput ipsecif6_ctlinput_wrapper 1010 1011 static const struct encapsw ipsecif6_encapsw = { 1012 .encapsw6 = { 1013 .pr_input = ipsecif6_input, 1014 .pr_ctlinput = ipsecif6_ctlinput, 1015 } 1016 }; 1017 #endif /* INET6 */ 1018
Indexes created Thu Oct 02 07:10:07 GMT 2025