ipsecif.c revision 1.4
1 /* $NetBSD: ipsecif.c,v 1.4 2018/03/09 11:05:21 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 1.4 2018/03/09 11:05:21 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 void ipsecif4_input(struct mbuf *, int, int, void *); 75 static int ipsecif4_output(struct ipsec_variant *, int, struct mbuf *); 76 static int ipsecif4_filter4(const struct ip *, struct ipsec_variant *, 77 struct ifnet *); 78 79 #ifdef INET6 80 static int ipsecif6_input(struct mbuf **, int *, int, void *); 81 static int ipsecif6_output(struct ipsec_variant *, int, struct mbuf *); 82 static int ipsecif6_filter6(const struct ip6_hdr *, struct ipsec_variant *, 83 struct ifnet *); 84 #endif 85 86 static int ip_ipsec_ttl = IPSEC_TTL; 87 static int ip_ipsec_copy_tos = 0; 88 #ifdef INET6 89 static int ip6_ipsec_hlim = IPSEC_HLIM; 90 static int ip6_ipsec_pmtu = 0; /* XXX: per interface configuration?? */ 91 static int ip6_ipsec_copy_tos = 0; 92 #endif 93 94 struct encapsw ipsecif4_encapsw = { 95 .encapsw4 = { 96 .pr_input = ipsecif4_input, 97 .pr_ctlinput = NULL, 98 } 99 }; 100 101 #ifdef INET6 102 static const struct encapsw ipsecif6_encapsw; 103 #endif 104 105 static struct mbuf * 106 ipsecif4_prepend_hdr(struct ipsec_variant *var, struct mbuf *m, 107 uint8_t proto, uint8_t tos) 108 { 109 struct ip *ip; 110 struct sockaddr_in *src, *dst; 111 112 src = satosin(var->iv_psrc); 113 dst = satosin(var->iv_pdst); 114 115 if (in_nullhost(src->sin_addr) || in_nullhost(src->sin_addr) || 116 src->sin_addr.s_addr == INADDR_BROADCAST || 117 dst->sin_addr.s_addr == INADDR_BROADCAST) { 118 m_freem(m); 119 return NULL; 120 } 121 m->m_flags &= ~M_BCAST; 122 123 if (IN_MULTICAST(src->sin_addr.s_addr) || 124 IN_MULTICAST(dst->sin_addr.s_addr)) { 125 m_freem(m); 126 return NULL; 127 } 128 129 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 130 if (m && M_UNWRITABLE(m, sizeof(struct ip))) 131 m = m_pullup(m, sizeof(struct ip)); 132 if (m == NULL) 133 return NULL; 134 135 ip = mtod(m, struct ip *); 136 ip->ip_v = IPVERSION; 137 ip->ip_off = htons(0); 138 ip->ip_id = 0; 139 ip->ip_hl = sizeof(*ip) >> 2; 140 if (ip_ipsec_copy_tos) 141 ip->ip_tos = tos; 142 else 143 ip->ip_tos = 0; 144 ip->ip_sum = 0; 145 ip->ip_src = src->sin_addr; 146 ip->ip_dst = dst->sin_addr; 147 ip->ip_p = proto; 148 ip->ip_ttl = ip_ipsec_ttl; 149 ip->ip_len = htons(m->m_pkthdr.len); 150 #ifndef IPSEC_TX_TOS_CLEAR 151 struct ifnet *ifp = &var->iv_softc->ipsec_if; 152 if (ifp->if_flags & IFF_ECN) 153 ip_ecn_ingress(ECN_ALLOWED, &ip->ip_tos, &tos); 154 else 155 ip_ecn_ingress(ECN_NOCARE, &ip->ip_tos, &tos); 156 #endif 157 158 return m; 159 } 160 161 static int 162 ipsecif4_needfrag(struct mbuf *m, struct ipsecrequest *isr) 163 { 164 struct ip ip0; 165 struct ip *ip; 166 int mtu; 167 struct secasvar *sav; 168 169 sav = key_lookup_sa_bysaidx(&isr->saidx); 170 if (sav == NULL) 171 return 0; 172 173 if (!(sav->natt_type & UDP_ENCAP_ESPINUDP) && 174 !(sav->natt_type & UDP_ENCAP_ESPINUDP_NON_IKE)) { 175 mtu = 0; 176 goto out; 177 } 178 179 if (m->m_len < sizeof(struct ip)) { 180 m_copydata(m, 0, sizeof(ip0), &ip0); 181 ip = &ip0; 182 } else { 183 ip = mtod(m, struct ip *); 184 } 185 mtu = sav->esp_frag; 186 if (ntohs(ip->ip_len) <= mtu) 187 mtu = 0; 188 189 out: 190 KEY_SA_UNREF(&sav); 191 return mtu; 192 } 193 194 static struct mbuf * 195 ipsecif4_flowinfo(struct mbuf *m, int family, int *proto0, u_int8_t *tos0) 196 { 197 const struct ip *ip; 198 int proto; 199 int tos; 200 201 KASSERT(proto0 != NULL); 202 KASSERT(tos0 != NULL); 203 204 switch (family) { 205 case AF_INET: 206 proto = IPPROTO_IPV4; 207 if (m->m_len < sizeof(*ip)) { 208 m = m_pullup(m, sizeof(*ip)); 209 if (m == NULL) { 210 *tos0 = 0; 211 *proto0 = 0; 212 return NULL; 213 } 214 } 215 ip = mtod(m, const struct ip *); 216 tos = ip->ip_tos; 217 /* TODO: support ALTQ for innner packet */ 218 break; 219 #ifdef INET6 220 case AF_INET6: { 221 const struct ip6_hdr *ip6; 222 proto = IPPROTO_IPV6; 223 if (m->m_len < sizeof(*ip6)) { 224 m = m_pullup(m, sizeof(*ip6)); 225 if (m == NULL) { 226 *tos0 = 0; 227 *proto0 = 0; 228 return NULL; 229 } 230 } 231 ip6 = mtod(m, const struct ip6_hdr *); 232 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 233 /* TODO: support ALTQ for innner packet */ 234 break; 235 } 236 #endif /* INET6 */ 237 default: 238 *tos0 = 0; 239 *proto0 = 0; 240 return NULL; 241 } 242 243 *proto0 = proto; 244 *tos0 = tos; 245 return m; 246 } 247 248 static int 249 ipsecif4_fragout(struct ipsec_variant *var, int family, struct mbuf *m, int mtu) 250 { 251 struct ifnet *ifp = &var->iv_softc->ipsec_if; 252 struct mbuf *next; 253 struct m_tag *mtag; 254 int error; 255 256 KASSERT(if_ipsec_heldref_variant(var)); 257 258 mtag = m_tag_find(m, PACKET_TAG_IPSEC_NAT_T_PORTS, NULL); 259 if (mtag) 260 m_tag_delete(m, mtag); 261 262 /* consider new IP header prepended in ipsecif4_output() */ 263 if (mtu <= sizeof(struct ip)) { 264 m_freem(m); 265 return ENETUNREACH; 266 } 267 m->m_pkthdr.csum_flags |= M_CSUM_IPv4; 268 error = ip_fragment(m, ifp, mtu - sizeof(struct ip)); 269 if (error) 270 return error; 271 272 for (error = 0; m; m = next) { 273 next = m->m_nextpkt; 274 m->m_nextpkt = NULL; 275 if (error) { 276 m_freem(m); 277 continue; 278 } 279 280 error = ipsecif4_output(var, family, m); 281 } 282 if (error == 0) 283 IP_STATINC(IP_STAT_FRAGMENTED); 284 285 return error; 286 } 287 288 int 289 ipsecif4_encap_func(struct mbuf *m, struct ip *ip, struct ipsec_variant *var) 290 { 291 struct m_tag *mtag; 292 struct sockaddr_in *src, *dst; 293 u_int16_t src_port = 0; 294 u_int16_t dst_port = 0; 295 296 KASSERT(var != NULL); 297 298 src = satosin(var->iv_psrc); 299 dst = satosin(var->iv_pdst); 300 mtag = m_tag_find(m, PACKET_TAG_IPSEC_NAT_T_PORTS, NULL); 301 if (mtag) { 302 u_int16_t *ports; 303 304 ports = (u_int16_t *)(mtag + 1); 305 src_port = ports[0]; 306 dst_port = ports[1]; 307 } 308 309 /* address match */ 310 if (src->sin_addr.s_addr != ip->ip_dst.s_addr || 311 dst->sin_addr.s_addr != ip->ip_src.s_addr) 312 return 0; 313 314 /* UDP encap? */ 315 if (mtag == NULL && var->iv_sport == 0 && var->iv_dport == 0) 316 goto match; 317 318 /* port match */ 319 if (src_port != var->iv_dport || 320 dst_port != var->iv_sport) { 321 #ifdef DEBUG 322 printf("%s: port mismatch: pkt(%u, %u), if(%u, %u)\n", 323 __func__, ntohs(src_port), ntohs(dst_port), 324 ntohs(var->iv_sport), ntohs(var->iv_dport)); 325 #endif 326 return 0; 327 } 328 329 match: 330 /* 331 * hide NAT-T information from encapsulated traffics. 332 * they don't know about IPsec. 333 */ 334 if (mtag) 335 m_tag_delete(m, mtag); 336 return sizeof(src->sin_addr) + sizeof(dst->sin_addr); 337 } 338 339 static int 340 ipsecif4_output(struct ipsec_variant *var, int family, struct mbuf *m) 341 { 342 struct secpolicy *sp = NULL; 343 u_int8_t tos; 344 int proto; 345 int error; 346 int mtu; 347 u_long sa_mtu = 0; 348 349 KASSERT(if_ipsec_heldref_variant(var)); 350 KASSERT(if_ipsec_variant_is_configured(var)); 351 KASSERT(var->iv_psrc->sa_family == AF_INET); 352 KASSERT(var->iv_pdst->sa_family == AF_INET); 353 354 sp = IV_SP_OUT(var); 355 KASSERT(sp != NULL); 356 /* 357 * The SPs in ipsec_variant are prevented from freed by 358 * ipsec_variant->iv_psref. So, KEY_SP_REF() is unnecessary here. 359 */ 360 361 KASSERT(sp->policy != IPSEC_POLICY_NONE); 362 KASSERT(sp->policy != IPSEC_POLICY_ENTRUST); 363 KASSERT(sp->policy != IPSEC_POLICY_BYPASS); 364 if (sp->policy != IPSEC_POLICY_IPSEC) { 365 struct ifnet *ifp = &var->iv_softc->ipsec_if; 366 m_freem(m); 367 IF_DROP(&ifp->if_snd); 368 return 0; 369 } 370 371 /* get flowinfo */ 372 m = ipsecif4_flowinfo(m, family, &proto, &tos); 373 if (m == NULL) { 374 error = ENETUNREACH; 375 goto done; 376 } 377 378 /* prepend new IP header */ 379 m = ipsecif4_prepend_hdr(var, m, proto, tos); 380 if (m == NULL) { 381 error = ENETUNREACH; 382 goto done; 383 } 384 385 /* 386 * Normal netipsec's NAT-T fragmentation is done in ip_output(). 387 * See "natt_frag" processing. 388 * However, ipsec(4) interface's one is not done in the same way, 389 * so we must do NAT-T fragmentation by own code. 390 */ 391 /* NAT-T ESP fragmentation */ 392 mtu = ipsecif4_needfrag(m, sp->req); 393 if (mtu > 0) 394 return ipsecif4_fragout(var, family, m, mtu); 395 396 /* IPsec output */ 397 IP_STATINC(IP_STAT_LOCALOUT); 398 error = ipsec4_process_packet(m, sp->req, &sa_mtu); 399 if (error == ENOENT) 400 error = 0; 401 /* 402 * frangmentation is already done in ipsecif4_fragout(), 403 * so ipsec4_process_packet() must not do fragmentation here. 404 */ 405 KASSERT(sa_mtu == 0); 406 407 done: 408 return error; 409 } 410 411 #ifdef INET6 412 static int 413 ipsecif6_output(struct ipsec_variant *var, int family, struct mbuf *m) 414 { 415 struct ifnet *ifp = &var->iv_softc->ipsec_if; 416 struct ipsec_softc *sc = ifp->if_softc; 417 struct ipsec_ro *iro; 418 struct rtentry *rt; 419 struct sockaddr_in6 *sin6_src; 420 struct sockaddr_in6 *sin6_dst; 421 struct ip6_hdr *ip6; 422 int proto, error; 423 u_int8_t itos, otos; 424 union { 425 struct sockaddr dst; 426 struct sockaddr_in6 dst6; 427 } u; 428 429 KASSERT(if_ipsec_heldref_variant(var)); 430 KASSERT(if_ipsec_variant_is_configured(var)); 431 432 sin6_src = satosin6(var->iv_psrc); 433 sin6_dst = satosin6(var->iv_pdst); 434 435 KASSERT(sin6_src->sin6_family == AF_INET6); 436 KASSERT(sin6_dst->sin6_family == AF_INET6); 437 438 switch (family) { 439 #ifdef INET 440 case AF_INET: 441 { 442 struct ip *ip; 443 444 proto = IPPROTO_IPV4; 445 if (m->m_len < sizeof(*ip)) { 446 m = m_pullup(m, sizeof(*ip)); 447 if (m == NULL) 448 return ENOBUFS; 449 } 450 ip = mtod(m, struct ip *); 451 itos = ip->ip_tos; 452 /* TODO: support ALTQ for innner packet */ 453 break; 454 } 455 #endif /* INET */ 456 case AF_INET6: 457 { 458 struct ip6_hdr *xip6; 459 proto = IPPROTO_IPV6; 460 if (m->m_len < sizeof(*xip6)) { 461 m = m_pullup(m, sizeof(*xip6)); 462 if (m == NULL) 463 return ENOBUFS; 464 } 465 xip6 = mtod(m, struct ip6_hdr *); 466 itos = (ntohl(xip6->ip6_flow) >> 20) & 0xff; 467 /* TODO: support ALTQ for innner packet */ 468 break; 469 } 470 default: 471 m_freem(m); 472 return EAFNOSUPPORT; 473 } 474 475 /* prepend new IP header */ 476 M_PREPEND(m, sizeof(struct ip6_hdr), M_DONTWAIT); 477 if (m && M_UNWRITABLE(m, sizeof(struct ip6_hdr))) 478 m = m_pullup(m, sizeof(struct ip6_hdr)); 479 if (m == NULL) 480 return ENOBUFS; 481 482 ip6 = mtod(m, struct ip6_hdr *); 483 ip6->ip6_flow = 0; 484 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 485 ip6->ip6_vfc |= IPV6_VERSION; 486 ip6->ip6_plen = htons((u_short)m->m_pkthdr.len); 487 ip6->ip6_nxt = proto; 488 ip6->ip6_hlim = ip6_ipsec_hlim; 489 ip6->ip6_src = sin6_src->sin6_addr; 490 /* bidirectional configured tunnel mode */ 491 if (!IN6_IS_ADDR_UNSPECIFIED(&sin6_dst->sin6_addr)) { 492 ip6->ip6_dst = sin6_dst->sin6_addr; 493 } else { 494 m_freem(m); 495 return ENETUNREACH; 496 } 497 #ifndef IPSEC_TX_TOS_CLEAR 498 if (ifp->if_flags & IFF_ECN) 499 ip_ecn_ingress(ECN_ALLOWED, &otos, &itos); 500 else 501 ip_ecn_ingress(ECN_NOCARE, &otos, &itos); 502 503 if (!ip6_ipsec_copy_tos) 504 otos = 0; 505 #else 506 if (ip6_ipsec_copy_tos) 507 otos = itos; 508 else 509 otos = 0; 510 #endif 511 ip6->ip6_flow &= ~ntohl(0xff00000); 512 ip6->ip6_flow |= htonl((u_int32_t)otos << 20); 513 514 sockaddr_in6_init(&u.dst6, &sin6_dst->sin6_addr, 0, 0, 0); 515 516 iro = percpu_getref(sc->ipsec_ro_percpu); 517 mutex_enter(&iro->ir_lock); 518 if ((rt = rtcache_lookup(&iro->ir_ro, &u.dst)) == NULL) { 519 mutex_exit(&iro->ir_lock); 520 percpu_putref(sc->ipsec_ro_percpu); 521 m_freem(m); 522 return ENETUNREACH; 523 } 524 525 if (rt->rt_ifp == ifp) { 526 rtcache_unref(rt, &iro->ir_ro); 527 rtcache_free(&iro->ir_ro); 528 mutex_exit(&iro->ir_lock); 529 percpu_putref(sc->ipsec_ro_percpu); 530 m_freem(m); 531 return ENETUNREACH; 532 } 533 rtcache_unref(rt, &iro->ir_ro); 534 535 /* 536 * force fragmentation to minimum MTU, to avoid path MTU discovery. 537 * it is too painful to ask for resend of inner packet, to achieve 538 * path MTU discovery for encapsulated packets. 539 */ 540 error = ip6_output(m, 0, &iro->ir_ro, 541 ip6_ipsec_pmtu ? 0 : IPV6_MINMTU, 0, NULL, NULL); 542 if (error) 543 rtcache_free(&iro->ir_ro); 544 545 mutex_exit(&iro->ir_lock); 546 percpu_putref(sc->ipsec_ro_percpu); 547 548 return error; 549 } 550 #endif /* INET6 */ 551 552 static void 553 ipsecif4_input(struct mbuf *m, int off, int proto, void *eparg) 554 { 555 struct ifnet *ipsecp; 556 struct ipsec_softc *sc = eparg; 557 struct ipsec_variant *var; 558 const struct ip *ip; 559 int af; 560 #ifndef IPSEC_TX_TOS_CLEAR 561 u_int8_t otos; 562 #endif 563 struct psref psref_rcvif; 564 struct psref psref_var; 565 struct ifnet *rcvif; 566 567 KASSERT(sc != NULL); 568 569 ipsecp = &sc->ipsec_if; 570 if ((ipsecp->if_flags & IFF_UP) == 0) { 571 m_freem(m); 572 ip_statinc(IP_STAT_NOIPSEC); 573 return; 574 } 575 576 var = if_ipsec_getref_variant(sc, &psref_var); 577 if (if_ipsec_variant_is_unconfigured(var)) { 578 if_ipsec_putref_variant(var, &psref_var); 579 m_freem(m); 580 ip_statinc(IP_STAT_NOIPSEC); 581 return; 582 } 583 584 ip = mtod(m, const struct ip *); 585 586 rcvif = m_get_rcvif_psref(m, &psref_rcvif); 587 if (rcvif == NULL || !ipsecif4_filter4(ip, var, rcvif)) { 588 m_put_rcvif_psref(rcvif, &psref_rcvif); 589 if_ipsec_putref_variant(var, &psref_var); 590 m_freem(m); 591 ip_statinc(IP_STAT_NOIPSEC); 592 return; 593 } 594 m_put_rcvif_psref(rcvif, &psref_rcvif); 595 if_ipsec_putref_variant(var, &psref_var); 596 #ifndef IPSEC_TX_TOS_CLEAR 597 otos = ip->ip_tos; 598 #endif 599 m_adj(m, off); 600 601 switch (proto) { 602 case IPPROTO_IPV4: 603 { 604 struct ip *xip; 605 af = AF_INET; 606 if (M_UNWRITABLE(m, sizeof(*xip))) { 607 m = m_pullup(m, sizeof(*xip)); 608 if (m == NULL) 609 return; 610 } 611 xip = mtod(m, struct ip *); 612 #ifndef IPSEC_TX_TOS_CLEAR 613 if (ipsecp->if_flags & IFF_ECN) 614 ip_ecn_egress(ECN_ALLOWED, &otos, &xip->ip_tos); 615 else 616 ip_ecn_egress(ECN_NOCARE, &otos, &xip->ip_tos); 617 #endif 618 break; 619 } 620 #ifdef INET6 621 case IPPROTO_IPV6: 622 { 623 struct ip6_hdr *ip6; 624 u_int8_t itos; 625 af = AF_INET6; 626 if (M_UNWRITABLE(m, sizeof(*ip6))) { 627 m = m_pullup(m, sizeof(*ip6)); 628 if (m == NULL) 629 return; 630 } 631 ip6 = mtod(m, struct ip6_hdr *); 632 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 633 #ifndef IPSEC_TX_TOS_CLEAR 634 if (ipsecp->if_flags & IFF_ECN) 635 ip_ecn_egress(ECN_ALLOWED, &otos, &itos); 636 else 637 ip_ecn_egress(ECN_NOCARE, &otos, &itos); 638 #endif 639 ip6->ip6_flow &= ~htonl(0xff << 20); 640 ip6->ip6_flow |= htonl((u_int32_t)itos << 20); 641 break; 642 } 643 #endif /* INET6 */ 644 default: 645 ip_statinc(IP_STAT_NOIPSEC); 646 m_freem(m); 647 return; 648 } 649 if_ipsec_input(m, af, ipsecp); 650 651 return; 652 } 653 654 /* 655 * validate and filter the pakcet 656 */ 657 static int 658 ipsecif4_filter4(const struct ip *ip, struct ipsec_variant *var, 659 struct ifnet *ifp) 660 { 661 struct sockaddr_in *src, *dst; 662 663 src = satosin(var->iv_psrc); 664 dst = satosin(var->iv_pdst); 665 666 return in_tunnel_validate(ip, src->sin_addr, dst->sin_addr); 667 } 668 669 #ifdef INET6 670 static int 671 ipsecif6_input(struct mbuf **mp, int *offp, int proto, void *eparg) 672 { 673 struct mbuf *m = *mp; 674 struct ifnet *ipsecp; 675 struct ipsec_softc *sc = eparg; 676 struct ipsec_variant *var; 677 struct ip6_hdr *ip6; 678 int af = 0; 679 #ifndef IPSEC_TX_TOS_CLEAR 680 u_int32_t otos; 681 #endif 682 struct psref psref_rcvif; 683 struct psref psref_var; 684 struct ifnet *rcvif; 685 686 KASSERT(eparg != NULL); 687 688 ipsecp = &sc->ipsec_if; 689 if ((ipsecp->if_flags & IFF_UP) == 0) { 690 m_freem(m); 691 IP6_STATINC(IP6_STAT_NOIPSEC); 692 return IPPROTO_DONE; 693 } 694 695 var = if_ipsec_getref_variant(sc, &psref_var); 696 if (if_ipsec_variant_is_unconfigured(var)) { 697 if_ipsec_putref_variant(var, &psref_var); 698 m_freem(m); 699 IP6_STATINC(IP6_STAT_NOIPSEC); 700 return IPPROTO_DONE; 701 } 702 703 ip6 = mtod(m, struct ip6_hdr *); 704 705 rcvif = m_get_rcvif_psref(m, &psref_rcvif); 706 if (rcvif == NULL || !ipsecif6_filter6(ip6, var, rcvif)) { 707 m_put_rcvif_psref(rcvif, &psref_rcvif); 708 if_ipsec_putref_variant(var, &psref_var); 709 m_freem(m); 710 IP6_STATINC(IP6_STAT_NOIPSEC); 711 return IPPROTO_DONE; 712 } 713 m_put_rcvif_psref(rcvif, &psref_rcvif); 714 if_ipsec_putref_variant(var, &psref_var); 715 716 #ifndef IPSEC_TX_TOS_CLEAR 717 otos = ip6->ip6_flow; 718 #endif 719 m_adj(m, *offp); 720 721 switch (proto) { 722 #ifdef INET 723 case IPPROTO_IPV4: 724 { 725 af = AF_INET; 726 #ifndef IPSEC_TX_TOS_CLEAR 727 struct ip *ip; 728 u_int8_t otos8; 729 otos8 = (ntohl(otos) >> 20) & 0xff; 730 731 if (M_UNWRITABLE(m, sizeof(*ip))) { 732 m = m_pullup(m, sizeof(*ip)); 733 if (m == NULL) 734 return IPPROTO_DONE; 735 } 736 ip = mtod(m, struct ip *); 737 if (ipsecp->if_flags & IFF_ECN) 738 ip_ecn_egress(ECN_ALLOWED, &otos8, &ip->ip_tos); 739 else 740 ip_ecn_egress(ECN_NOCARE, &otos8, &ip->ip_tos); 741 #endif 742 break; 743 } 744 #endif /* INET */ 745 case IPPROTO_IPV6: 746 { 747 af = AF_INET6; 748 #ifndef IPSEC_TX_TOS_CLEAR 749 struct ip6_hdr *xip6; 750 751 if (M_UNWRITABLE(m, sizeof(*xip6))) { 752 m = m_pullup(m, sizeof(*xip6)); 753 if (m == NULL) 754 return IPPROTO_DONE; 755 } 756 xip6 = mtod(m, struct ip6_hdr *); 757 if (ipsecp->if_flags & IFF_ECN) 758 ip6_ecn_egress(ECN_ALLOWED, &otos, &xip6->ip6_flow); 759 else 760 ip6_ecn_egress(ECN_NOCARE, &otos, &xip6->ip6_flow); 761 break; 762 #endif 763 } 764 default: 765 IP6_STATINC(IP6_STAT_NOIPSEC); 766 m_freem(m); 767 return IPPROTO_DONE; 768 } 769 770 if_ipsec_input(m, af, ipsecp); 771 return IPPROTO_DONE; 772 } 773 774 /* 775 * validate and filter the packet. 776 */ 777 static int 778 ipsecif6_filter6(const struct ip6_hdr *ip6, struct ipsec_variant *var, 779 struct ifnet *ifp) 780 { 781 struct sockaddr_in6 *src, *dst; 782 783 src = satosin6(var->iv_psrc); 784 dst = satosin6(var->iv_pdst); 785 786 return in6_tunnel_validate(ip6, &src->sin6_addr, &dst->sin6_addr); 787 } 788 #endif /* INET6 */ 789 790 int 791 ipsecif4_attach(struct ipsec_variant *var) 792 { 793 struct ipsec_softc *sc = var->iv_softc; 794 795 KASSERT(if_ipsec_variant_is_configured(var)); 796 797 if (var->iv_encap_cookie4 != NULL) 798 return EALREADY; 799 var->iv_encap_cookie4 = encap_attach_func(AF_INET, -1, if_ipsec_encap_func, 800 &ipsecif4_encapsw, sc); 801 if (var->iv_encap_cookie4 == NULL) 802 return EEXIST; 803 804 var->iv_output = ipsecif4_output; 805 return 0; 806 } 807 808 int 809 ipsecif4_detach(struct ipsec_variant *var) 810 { 811 int error; 812 813 if (var->iv_encap_cookie4 == NULL) 814 return 0; 815 816 var->iv_output = NULL; 817 error = encap_detach(var->iv_encap_cookie4); 818 if (error == 0) 819 var->iv_encap_cookie4 = NULL; 820 821 return error; 822 } 823 824 #ifdef INET6 825 int 826 ipsecif6_attach(struct ipsec_variant *var) 827 { 828 struct sockaddr_in6 mask6; 829 struct ipsec_softc *sc = var->iv_softc; 830 831 KASSERT(if_ipsec_variant_is_configured(var)); 832 KASSERT(var->iv_encap_cookie6 == NULL); 833 834 memset(&mask6, 0, sizeof(mask6)); 835 mask6.sin6_len = sizeof(struct sockaddr_in6); 836 mask6.sin6_addr.s6_addr32[0] = mask6.sin6_addr.s6_addr32[1] = 837 mask6.sin6_addr.s6_addr32[2] = mask6.sin6_addr.s6_addr32[3] = ~0; 838 839 var->iv_encap_cookie6 = encap_attach(AF_INET6, -1, 840 var->iv_psrc, (struct sockaddr *)&mask6, 841 var->iv_pdst, (struct sockaddr *)&mask6, 842 &ipsecif6_encapsw, sc); 843 if (var->iv_encap_cookie6 == NULL) 844 return EEXIST; 845 846 var->iv_output = ipsecif6_output; 847 return 0; 848 } 849 850 static void 851 ipsecif6_rtcache_free_pc(void *p, void *arg __unused, struct cpu_info *ci __unused) 852 { 853 struct ipsec_ro *iro = p; 854 855 mutex_enter(&iro->ir_lock); 856 rtcache_free(&iro->ir_ro); 857 mutex_exit(&iro->ir_lock); 858 } 859 860 int 861 ipsecif6_detach(struct ipsec_variant *var) 862 { 863 struct ipsec_softc *sc = var->iv_softc; 864 int error; 865 866 KASSERT(var->iv_encap_cookie6 != NULL); 867 868 percpu_foreach(sc->ipsec_ro_percpu, ipsecif6_rtcache_free_pc, NULL); 869 870 var->iv_output = NULL; 871 error = encap_detach(var->iv_encap_cookie6); 872 if (error == 0) 873 var->iv_encap_cookie6 = NULL; 874 return error; 875 } 876 877 void * 878 ipsecif6_ctlinput(int cmd, const struct sockaddr *sa, void *d, void *eparg) 879 { 880 struct ipsec_softc *sc = eparg; 881 struct ip6ctlparam *ip6cp = NULL; 882 struct ip6_hdr *ip6; 883 const struct sockaddr_in6 *dst6; 884 struct ipsec_ro *iro; 885 886 if (sa->sa_family != AF_INET6 || 887 sa->sa_len != sizeof(struct sockaddr_in6)) 888 return NULL; 889 890 if ((unsigned)cmd >= PRC_NCMDS) 891 return NULL; 892 if (cmd == PRC_HOSTDEAD) 893 d = NULL; 894 else if (inet6ctlerrmap[cmd] == 0) 895 return NULL; 896 897 /* if the parameter is from icmp6, decode it. */ 898 if (d != NULL) { 899 ip6cp = (struct ip6ctlparam *)d; 900 ip6 = ip6cp->ip6c_ip6; 901 } else { 902 ip6 = NULL; 903 } 904 905 if (!ip6) 906 return NULL; 907 908 iro = percpu_getref(sc->ipsec_ro_percpu); 909 mutex_enter(&iro->ir_lock); 910 dst6 = satocsin6(rtcache_getdst(&iro->ir_ro)); 911 /* XXX scope */ 912 if (dst6 == NULL) 913 ; 914 else if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &dst6->sin6_addr)) 915 /* flush route cache */ 916 rtcache_free(&iro->ir_ro); 917 918 mutex_exit(&iro->ir_lock); 919 percpu_putref(sc->ipsec_ro_percpu); 920 921 return NULL; 922 } 923 924 ENCAP_PR_WRAP_CTLINPUT(ipsecif6_ctlinput) 925 #define ipsecif6_ctlinput ipsecif6_ctlinput_wrapper 926 927 static const struct encapsw ipsecif6_encapsw = { 928 .encapsw6 = { 929 .pr_input = ipsecif6_input, 930 .pr_ctlinput = ipsecif6_ctlinput, 931 } 932 }; 933 #endif /* INET6 */ 934
Indexes created Mon Sep 22 21:09:42 GMT 2025