ipsecif.c revision 1.15
1 /* $NetBSD: ipsecif.c,v 1.15 2019/04/12 07:12:12 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 1.15 2019/04/12 07:12:12 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 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 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 ipsec_ro *iro; 504 struct rtentry *rt; 505 struct sockaddr_in6 *sin6_src; 506 struct sockaddr_in6 *sin6_dst; 507 struct ip6_hdr *ip6; 508 int proto, error; 509 u_int8_t itos, otos; 510 union { 511 struct sockaddr dst; 512 struct sockaddr_in6 dst6; 513 } u; 514 515 KASSERT(if_ipsec_heldref_variant(var)); 516 KASSERT(if_ipsec_variant_is_configured(var)); 517 518 sin6_src = satosin6(var->iv_psrc); 519 sin6_dst = satosin6(var->iv_pdst); 520 521 KASSERT(sin6_src->sin6_family == AF_INET6); 522 KASSERT(sin6_dst->sin6_family == AF_INET6); 523 524 switch (family) { 525 #ifdef INET 526 case AF_INET: 527 { 528 struct ip *ip; 529 530 proto = IPPROTO_IPV4; 531 if (m->m_len < sizeof(*ip)) { 532 m = m_pullup(m, sizeof(*ip)); 533 if (m == NULL) 534 return ENOBUFS; 535 } 536 ip = mtod(m, struct ip *); 537 itos = ip->ip_tos; 538 /* TODO: support ALTQ for innner packet */ 539 break; 540 } 541 #endif /* INET */ 542 case AF_INET6: 543 { 544 struct ip6_hdr *xip6; 545 proto = IPPROTO_IPV6; 546 if (m->m_len < sizeof(*xip6)) { 547 m = m_pullup(m, sizeof(*xip6)); 548 if (m == NULL) 549 return ENOBUFS; 550 } 551 xip6 = mtod(m, struct ip6_hdr *); 552 itos = (ntohl(xip6->ip6_flow) >> 20) & 0xff; 553 /* TODO: support ALTQ for innner packet */ 554 break; 555 } 556 default: 557 m_freem(m); 558 return EAFNOSUPPORT; 559 } 560 561 /* prepend new IP header */ 562 M_PREPEND(m, sizeof(struct ip6_hdr), M_DONTWAIT); 563 if (m && M_UNWRITABLE(m, sizeof(struct ip6_hdr))) 564 m = m_pullup(m, sizeof(struct ip6_hdr)); 565 if (m == NULL) 566 return ENOBUFS; 567 568 ip6 = mtod(m, struct ip6_hdr *); 569 ip6->ip6_flow = 0; 570 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 571 ip6->ip6_vfc |= IPV6_VERSION; 572 #if 0 /* ip6->ip6_plen will be filled by ip6_output */ 573 ip6->ip6_plen = htons((u_short)m->m_pkthdr.len - sizeof(*ip6)); 574 #endif 575 ip6->ip6_nxt = proto; 576 ip6->ip6_hlim = ip6_ipsec_hlim; 577 ip6->ip6_src = sin6_src->sin6_addr; 578 /* bidirectional configured tunnel mode */ 579 if (!IN6_IS_ADDR_UNSPECIFIED(&sin6_dst->sin6_addr)) { 580 ip6->ip6_dst = sin6_dst->sin6_addr; 581 } else { 582 m_freem(m); 583 return ENETUNREACH; 584 } 585 #ifndef IPSEC_TX_TOS_CLEAR 586 if (ifp->if_flags & IFF_ECN) 587 ip_ecn_ingress(ECN_ALLOWED, &otos, &itos); 588 else 589 ip_ecn_ingress(ECN_NOCARE, &otos, &itos); 590 591 if (!ip6_ipsec_copy_tos) 592 otos = 0; 593 #else 594 if (ip6_ipsec_copy_tos) 595 otos = itos; 596 else 597 otos = 0; 598 #endif 599 ip6->ip6_flow &= ~ntohl(0xff00000); 600 ip6->ip6_flow |= htonl((u_int32_t)otos << 20); 601 602 sockaddr_in6_init(&u.dst6, &sin6_dst->sin6_addr, 0, 0, 0); 603 604 iro = percpu_getref(sc->ipsec_ro_percpu); 605 mutex_enter(iro->ir_lock); 606 if ((rt = rtcache_lookup(&iro->ir_ro, &u.dst)) == NULL) { 607 mutex_exit(iro->ir_lock); 608 percpu_putref(sc->ipsec_ro_percpu); 609 m_freem(m); 610 return ENETUNREACH; 611 } 612 613 if (rt->rt_ifp == ifp) { 614 rtcache_unref(rt, &iro->ir_ro); 615 rtcache_free(&iro->ir_ro); 616 mutex_exit(iro->ir_lock); 617 percpu_putref(sc->ipsec_ro_percpu); 618 m_freem(m); 619 return ENETUNREACH; 620 } 621 rtcache_unref(rt, &iro->ir_ro); 622 623 /* set NAT-T ports */ 624 error = ipsecif_set_natt_ports(var, m); 625 if (error) { 626 m_freem(m); 627 goto out; 628 } 629 630 /* 631 * force fragmentation to minimum MTU, to avoid path MTU discovery. 632 * it is too painful to ask for resend of inner packet, to achieve 633 * path MTU discovery for encapsulated packets. 634 */ 635 error = ip6_output(m, 0, &iro->ir_ro, 636 ip6_ipsec_pmtu ? 0 : IPV6_MINMTU, 0, NULL, NULL); 637 638 out: 639 if (error) 640 rtcache_free(&iro->ir_ro); 641 mutex_exit(iro->ir_lock); 642 percpu_putref(sc->ipsec_ro_percpu); 643 644 return error; 645 } 646 #endif /* INET6 */ 647 648 static void 649 ipsecif4_input(struct mbuf *m, int off, int proto, void *eparg) 650 { 651 struct ifnet *ipsecp; 652 struct ipsec_softc *sc = eparg; 653 struct ipsec_variant *var; 654 const struct ip *ip; 655 int af; 656 #ifndef IPSEC_TX_TOS_CLEAR 657 u_int8_t otos; 658 #endif 659 struct psref psref_rcvif; 660 struct psref psref_var; 661 struct ifnet *rcvif; 662 663 KASSERT(sc != NULL); 664 665 ipsecp = &sc->ipsec_if; 666 if ((ipsecp->if_flags & IFF_UP) == 0) { 667 m_freem(m); 668 ip_statinc(IP_STAT_NOIPSEC); 669 return; 670 } 671 672 var = if_ipsec_getref_variant(sc, &psref_var); 673 if (if_ipsec_variant_is_unconfigured(var)) { 674 if_ipsec_putref_variant(var, &psref_var); 675 m_freem(m); 676 ip_statinc(IP_STAT_NOIPSEC); 677 return; 678 } 679 680 ip = mtod(m, const struct ip *); 681 682 rcvif = m_get_rcvif_psref(m, &psref_rcvif); 683 if (rcvif == NULL || !ipsecif4_filter4(ip, var, rcvif)) { 684 m_put_rcvif_psref(rcvif, &psref_rcvif); 685 if_ipsec_putref_variant(var, &psref_var); 686 m_freem(m); 687 ip_statinc(IP_STAT_NOIPSEC); 688 return; 689 } 690 m_put_rcvif_psref(rcvif, &psref_rcvif); 691 if_ipsec_putref_variant(var, &psref_var); 692 #ifndef IPSEC_TX_TOS_CLEAR 693 otos = ip->ip_tos; 694 #endif 695 m_adj(m, off); 696 697 switch (proto) { 698 case IPPROTO_IPV4: 699 { 700 struct ip *xip; 701 af = AF_INET; 702 if (M_UNWRITABLE(m, sizeof(*xip))) { 703 m = m_pullup(m, sizeof(*xip)); 704 if (m == NULL) 705 return; 706 } 707 xip = mtod(m, struct ip *); 708 #ifndef IPSEC_TX_TOS_CLEAR 709 if (ipsecp->if_flags & IFF_ECN) 710 ip_ecn_egress(ECN_ALLOWED, &otos, &xip->ip_tos); 711 else 712 ip_ecn_egress(ECN_NOCARE, &otos, &xip->ip_tos); 713 #endif 714 break; 715 } 716 #ifdef INET6 717 case IPPROTO_IPV6: 718 { 719 struct ip6_hdr *ip6; 720 u_int8_t itos; 721 af = AF_INET6; 722 if (M_UNWRITABLE(m, sizeof(*ip6))) { 723 m = m_pullup(m, sizeof(*ip6)); 724 if (m == NULL) 725 return; 726 } 727 ip6 = mtod(m, struct ip6_hdr *); 728 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 729 #ifndef IPSEC_TX_TOS_CLEAR 730 if (ipsecp->if_flags & IFF_ECN) 731 ip_ecn_egress(ECN_ALLOWED, &otos, &itos); 732 else 733 ip_ecn_egress(ECN_NOCARE, &otos, &itos); 734 #endif 735 ip6->ip6_flow &= ~htonl(0xff << 20); 736 ip6->ip6_flow |= htonl((u_int32_t)itos << 20); 737 break; 738 } 739 #endif /* INET6 */ 740 default: 741 ip_statinc(IP_STAT_NOIPSEC); 742 m_freem(m); 743 return; 744 } 745 if_ipsec_input(m, af, ipsecp); 746 747 return; 748 } 749 750 /* 751 * validate and filter the packet 752 */ 753 static int 754 ipsecif4_filter4(const struct ip *ip, struct ipsec_variant *var, 755 struct ifnet *ifp) 756 { 757 struct sockaddr_in *src, *dst; 758 759 src = satosin(var->iv_psrc); 760 dst = satosin(var->iv_pdst); 761 762 return in_tunnel_validate(ip, src->sin_addr, dst->sin_addr); 763 } 764 765 #ifdef INET6 766 static int 767 ipsecif6_input(struct mbuf **mp, int *offp, int proto, void *eparg) 768 { 769 struct mbuf *m = *mp; 770 struct ifnet *ipsecp; 771 struct ipsec_softc *sc = eparg; 772 struct ipsec_variant *var; 773 struct ip6_hdr *ip6; 774 int af = 0; 775 #ifndef IPSEC_TX_TOS_CLEAR 776 u_int32_t otos; 777 #endif 778 struct psref psref_rcvif; 779 struct psref psref_var; 780 struct ifnet *rcvif; 781 782 KASSERT(eparg != NULL); 783 784 ipsecp = &sc->ipsec_if; 785 if ((ipsecp->if_flags & IFF_UP) == 0) { 786 m_freem(m); 787 IP6_STATINC(IP6_STAT_NOIPSEC); 788 return IPPROTO_DONE; 789 } 790 791 var = if_ipsec_getref_variant(sc, &psref_var); 792 if (if_ipsec_variant_is_unconfigured(var)) { 793 if_ipsec_putref_variant(var, &psref_var); 794 m_freem(m); 795 IP6_STATINC(IP6_STAT_NOIPSEC); 796 return IPPROTO_DONE; 797 } 798 799 ip6 = mtod(m, struct ip6_hdr *); 800 801 rcvif = m_get_rcvif_psref(m, &psref_rcvif); 802 if (rcvif == NULL || !ipsecif6_filter6(ip6, var, rcvif)) { 803 m_put_rcvif_psref(rcvif, &psref_rcvif); 804 if_ipsec_putref_variant(var, &psref_var); 805 m_freem(m); 806 IP6_STATINC(IP6_STAT_NOIPSEC); 807 return IPPROTO_DONE; 808 } 809 m_put_rcvif_psref(rcvif, &psref_rcvif); 810 if_ipsec_putref_variant(var, &psref_var); 811 812 #ifndef IPSEC_TX_TOS_CLEAR 813 otos = ip6->ip6_flow; 814 #endif 815 m_adj(m, *offp); 816 817 switch (proto) { 818 #ifdef INET 819 case IPPROTO_IPV4: 820 { 821 af = AF_INET; 822 #ifndef IPSEC_TX_TOS_CLEAR 823 struct ip *ip; 824 u_int8_t otos8; 825 otos8 = (ntohl(otos) >> 20) & 0xff; 826 827 if (M_UNWRITABLE(m, sizeof(*ip))) { 828 m = m_pullup(m, sizeof(*ip)); 829 if (m == NULL) 830 return IPPROTO_DONE; 831 } 832 ip = mtod(m, struct ip *); 833 if (ipsecp->if_flags & IFF_ECN) 834 ip_ecn_egress(ECN_ALLOWED, &otos8, &ip->ip_tos); 835 else 836 ip_ecn_egress(ECN_NOCARE, &otos8, &ip->ip_tos); 837 #endif 838 break; 839 } 840 #endif /* INET */ 841 case IPPROTO_IPV6: 842 { 843 af = AF_INET6; 844 #ifndef IPSEC_TX_TOS_CLEAR 845 struct ip6_hdr *xip6; 846 847 if (M_UNWRITABLE(m, sizeof(*xip6))) { 848 m = m_pullup(m, sizeof(*xip6)); 849 if (m == NULL) 850 return IPPROTO_DONE; 851 } 852 xip6 = mtod(m, struct ip6_hdr *); 853 if (ipsecp->if_flags & IFF_ECN) 854 ip6_ecn_egress(ECN_ALLOWED, &otos, &xip6->ip6_flow); 855 else 856 ip6_ecn_egress(ECN_NOCARE, &otos, &xip6->ip6_flow); 857 break; 858 #endif 859 } 860 default: 861 IP6_STATINC(IP6_STAT_NOIPSEC); 862 m_freem(m); 863 return IPPROTO_DONE; 864 } 865 866 if_ipsec_input(m, af, ipsecp); 867 return IPPROTO_DONE; 868 } 869 870 /* 871 * validate and filter the packet. 872 */ 873 static int 874 ipsecif6_filter6(const struct ip6_hdr *ip6, struct ipsec_variant *var, 875 struct ifnet *ifp) 876 { 877 struct sockaddr_in6 *src, *dst; 878 879 src = satosin6(var->iv_psrc); 880 dst = satosin6(var->iv_pdst); 881 882 return in6_tunnel_validate(ip6, &src->sin6_addr, &dst->sin6_addr); 883 } 884 #endif /* INET6 */ 885 886 int 887 ipsecif4_attach(struct ipsec_variant *var) 888 { 889 struct ipsec_softc *sc = var->iv_softc; 890 891 KASSERT(if_ipsec_variant_is_configured(var)); 892 893 if (var->iv_encap_cookie4 != NULL) 894 return EALREADY; 895 var->iv_encap_cookie4 = encap_attach_func(AF_INET, -1, if_ipsec_encap_func, 896 &ipsecif4_encapsw, sc); 897 if (var->iv_encap_cookie4 == NULL) 898 return EEXIST; 899 900 var->iv_output = ipsecif4_output; 901 return 0; 902 } 903 904 int 905 ipsecif4_detach(struct ipsec_variant *var) 906 { 907 int error; 908 909 if (var->iv_encap_cookie4 == NULL) 910 return 0; 911 912 var->iv_output = NULL; 913 error = encap_detach(var->iv_encap_cookie4); 914 if (error == 0) 915 var->iv_encap_cookie4 = NULL; 916 917 return error; 918 } 919 920 #ifdef INET6 921 int 922 ipsecif6_attach(struct ipsec_variant *var) 923 { 924 struct ipsec_softc *sc = var->iv_softc; 925 926 KASSERT(if_ipsec_variant_is_configured(var)); 927 KASSERT(var->iv_encap_cookie6 == NULL); 928 929 var->iv_encap_cookie6 = encap_attach_func(AF_INET6, -1, if_ipsec_encap_func, 930 &ipsecif6_encapsw, sc); 931 if (var->iv_encap_cookie6 == NULL) 932 return EEXIST; 933 934 var->iv_output = ipsecif6_output; 935 return 0; 936 } 937 938 static void 939 ipsecif6_rtcache_free_pc(void *p, void *arg __unused, struct cpu_info *ci __unused) 940 { 941 struct ipsec_ro *iro = p; 942 943 mutex_enter(iro->ir_lock); 944 rtcache_free(&iro->ir_ro); 945 mutex_exit(iro->ir_lock); 946 } 947 948 int 949 ipsecif6_detach(struct ipsec_variant *var) 950 { 951 struct ipsec_softc *sc = var->iv_softc; 952 int error; 953 954 KASSERT(var->iv_encap_cookie6 != NULL); 955 956 percpu_foreach(sc->ipsec_ro_percpu, ipsecif6_rtcache_free_pc, NULL); 957 958 var->iv_output = NULL; 959 error = encap_detach(var->iv_encap_cookie6); 960 if (error == 0) 961 var->iv_encap_cookie6 = NULL; 962 return error; 963 } 964 965 void * 966 ipsecif6_ctlinput(int cmd, const struct sockaddr *sa, void *d, void *eparg) 967 { 968 struct ipsec_softc *sc = eparg; 969 struct ip6ctlparam *ip6cp = NULL; 970 struct ip6_hdr *ip6; 971 const struct sockaddr_in6 *dst6; 972 struct ipsec_ro *iro; 973 974 if (sa->sa_family != AF_INET6 || 975 sa->sa_len != sizeof(struct sockaddr_in6)) 976 return NULL; 977 978 if ((unsigned)cmd >= PRC_NCMDS) 979 return NULL; 980 if (cmd == PRC_HOSTDEAD) 981 d = NULL; 982 else if (inet6ctlerrmap[cmd] == 0) 983 return NULL; 984 985 /* if the parameter is from icmp6, decode it. */ 986 if (d != NULL) { 987 ip6cp = (struct ip6ctlparam *)d; 988 ip6 = ip6cp->ip6c_ip6; 989 } else { 990 ip6 = NULL; 991 } 992 993 if (!ip6) 994 return NULL; 995 996 iro = percpu_getref(sc->ipsec_ro_percpu); 997 mutex_enter(iro->ir_lock); 998 dst6 = satocsin6(rtcache_getdst(&iro->ir_ro)); 999 /* XXX scope */ 1000 if (dst6 == NULL) 1001 ; 1002 else if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &dst6->sin6_addr)) 1003 /* flush route cache */ 1004 rtcache_free(&iro->ir_ro); 1005 1006 mutex_exit(iro->ir_lock); 1007 percpu_putref(sc->ipsec_ro_percpu); 1008 1009 return NULL; 1010 } 1011 1012 ENCAP_PR_WRAP_CTLINPUT(ipsecif6_ctlinput) 1013 #define ipsecif6_ctlinput ipsecif6_ctlinput_wrapper 1014 1015 static const struct encapsw ipsecif6_encapsw = { 1016 .encapsw6 = { 1017 .pr_input = ipsecif6_input, 1018 .pr_ctlinput = ipsecif6_ctlinput, 1019 } 1020 }; 1021 #endif /* INET6 */ 1022
Indexes created Thu Oct 02 07:10:07 GMT 2025