if_ipsec.c revision 1.3.2.11
1 /* $NetBSD: if_ipsec.c,v 1.3.2.11 2019/03/15 14:47:22 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: if_ipsec.c,v 1.3.2.11 2019/03/15 14:47:22 martin Exp $"); 31 32 #ifdef _KERNEL_OPT 33 #include "opt_inet.h" 34 #endif 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/kernel.h> 39 #include <sys/mbuf.h> 40 #include <sys/socket.h> 41 #include <sys/sockio.h> 42 #include <sys/errno.h> 43 #include <sys/ioctl.h> 44 #include <sys/time.h> 45 #include <sys/syslog.h> 46 #include <sys/cpu.h> 47 #include <sys/kmem.h> 48 #include <sys/mutex.h> 49 #include <sys/pserialize.h> 50 #include <sys/psref.h> 51 52 #include <net/if.h> 53 #include <net/if_types.h> 54 #include <net/route.h> 55 #include <net/bpf.h> 56 #include <net/pfkeyv2.h> 57 58 #include <netinet/in.h> 59 #include <netinet/in_systm.h> 60 #include <netinet/ip.h> 61 #ifdef INET 62 #include <netinet/in_var.h> 63 #endif /* INET */ 64 65 #ifdef INET6 66 #include <netinet6/in6_var.h> 67 #include <netinet/ip6.h> 68 #include <netinet6/ip6_var.h> 69 #endif /* INET6 */ 70 71 #include <netinet/ip_encap.h> 72 73 #include <net/if_ipsec.h> 74 75 #include <net/raw_cb.h> 76 #include <net/pfkeyv2.h> 77 78 #include <netipsec/key.h> 79 #include <netipsec/keydb.h> /* for union sockaddr_union */ 80 #include <netipsec/ipsec.h> 81 #include <netipsec/ipsecif.h> 82 83 static void if_ipsec_ro_init_pc(void *, void *, struct cpu_info *); 84 static void if_ipsec_ro_fini_pc(void *, void *, struct cpu_info *); 85 86 static int if_ipsec_clone_create(struct if_clone *, int); 87 static int if_ipsec_clone_destroy(struct ifnet *); 88 89 static inline int if_ipsec_out_direct(struct ipsec_variant *, struct mbuf *, int); 90 static inline void if_ipsec_in_enqueue(struct mbuf *, int, struct ifnet *); 91 92 static int if_ipsec_encap_attach(struct ipsec_variant *); 93 static int if_ipsec_encap_detach(struct ipsec_variant *); 94 static int if_ipsec_set_tunnel(struct ifnet *, 95 struct sockaddr *, struct sockaddr *); 96 static void if_ipsec_delete_tunnel(struct ifnet *); 97 static int if_ipsec_ensure_flags(struct ifnet *, short); 98 static void if_ipsec_attach0(struct ipsec_softc *); 99 100 static int if_ipsec_update_variant(struct ipsec_softc *, 101 struct ipsec_variant *, struct ipsec_variant *); 102 103 /* sadb_msg */ 104 static inline void if_ipsec_add_mbuf(struct mbuf *, void *, size_t); 105 static inline void if_ipsec_add_pad(struct mbuf *, size_t); 106 static inline size_t if_ipsec_set_sadb_addr(struct sadb_address *, 107 struct sockaddr *, int, uint16_t); 108 static inline size_t if_ipsec_set_sadb_src(struct sadb_address *, 109 struct sockaddr *, int); 110 static inline size_t if_ipsec_set_sadb_dst(struct sadb_address *, 111 struct sockaddr *, int); 112 static inline size_t if_ipsec_set_sadb_x_policy(struct sadb_x_policy *, 113 struct sadb_x_ipsecrequest *, uint16_t, uint8_t, uint32_t, uint8_t, 114 struct sockaddr *, struct sockaddr *); 115 static inline void if_ipsec_set_sadb_msg(struct sadb_msg *, uint16_t, uint8_t); 116 static inline void if_ipsec_set_sadb_msg_add(struct sadb_msg *, uint16_t); 117 static inline void if_ipsec_set_sadb_msg_del(struct sadb_msg *, uint16_t); 118 /* SPD */ 119 static int if_ipsec_share_sp(struct ipsec_variant *); 120 static int if_ipsec_unshare_sp(struct ipsec_variant *); 121 static inline struct secpolicy *if_ipsec_add_sp0(struct sockaddr *, 122 in_port_t, struct sockaddr *, in_port_t, int, int, int, u_int); 123 static inline int if_ipsec_del_sp0(struct secpolicy *); 124 static int if_ipsec_add_sp(struct ipsec_variant *, 125 struct sockaddr *, in_port_t, struct sockaddr *, in_port_t); 126 static void if_ipsec_del_sp(struct ipsec_variant *); 127 static int if_ipsec_replace_sp(struct ipsec_softc *, struct ipsec_variant *, 128 struct ipsec_variant *); 129 130 static int if_ipsec_set_addr_port(struct sockaddr *, struct sockaddr *, 131 in_port_t); 132 #define IF_IPSEC_GATHER_PSRC_ADDR_PORT(var, target) \ 133 if_ipsec_set_addr_port(target, (var)->iv_psrc, (var)->iv_sport) 134 #define IF_IPSEC_GATHER_PDST_ADDR_PORT(var, target) \ 135 if_ipsec_set_addr_port(target, (var)->iv_pdst, (var)->iv_dport) 136 137 /* 138 * ipsec global variable definitions 139 */ 140 141 /* This list is used in ioctl context only. */ 142 LIST_HEAD(ipsec_sclist, ipsec_softc); 143 static struct { 144 struct ipsec_sclist list; 145 kmutex_t lock; 146 } ipsec_softcs __cacheline_aligned; 147 148 struct psref_class *iv_psref_class __read_mostly; 149 150 struct if_clone ipsec_cloner = 151 IF_CLONE_INITIALIZER("ipsec", if_ipsec_clone_create, if_ipsec_clone_destroy); 152 static int max_ipsec_nesting = MAX_IPSEC_NEST; 153 154 /* ARGSUSED */ 155 void 156 ipsecifattach(int count) 157 { 158 159 mutex_init(&ipsec_softcs.lock, MUTEX_DEFAULT, IPL_NONE); 160 LIST_INIT(&ipsec_softcs.list); 161 162 iv_psref_class = psref_class_create("ipsecvar", IPL_SOFTNET); 163 164 if_clone_attach(&ipsec_cloner); 165 } 166 167 static int 168 if_ipsec_clone_create(struct if_clone *ifc, int unit) 169 { 170 struct ipsec_softc *sc; 171 struct ipsec_variant *var; 172 173 sc = kmem_zalloc(sizeof(*sc), KM_SLEEP); 174 175 if_initname(&sc->ipsec_if, ifc->ifc_name, unit); 176 177 if_ipsec_attach0(sc); 178 179 var = kmem_zalloc(sizeof(*var), KM_SLEEP); 180 var->iv_softc = sc; 181 psref_target_init(&var->iv_psref, iv_psref_class); 182 183 sc->ipsec_var = var; 184 mutex_init(&sc->ipsec_lock, MUTEX_DEFAULT, IPL_NONE); 185 sc->ipsec_psz = pserialize_create(); 186 sc->ipsec_ro_percpu = percpu_alloc(sizeof(struct ipsec_ro)); 187 percpu_foreach(sc->ipsec_ro_percpu, if_ipsec_ro_init_pc, NULL); 188 189 mutex_enter(&ipsec_softcs.lock); 190 LIST_INSERT_HEAD(&ipsec_softcs.list, sc, ipsec_list); 191 mutex_exit(&ipsec_softcs.lock); 192 return 0; 193 } 194 195 static void 196 if_ipsec_attach0(struct ipsec_softc *sc) 197 { 198 199 sc->ipsec_if.if_addrlen = 0; 200 sc->ipsec_if.if_mtu = IPSEC_MTU; 201 sc->ipsec_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 202 /* set ipsec(4) specific default flags. */ 203 sc->ipsec_if.if_flags |= IFF_FWD_IPV6; 204 sc->ipsec_if.if_extflags = IFEF_NO_LINK_STATE_CHANGE | IFEF_MPSAFE; 205 sc->ipsec_if.if_ioctl = if_ipsec_ioctl; 206 sc->ipsec_if.if_output = if_ipsec_output; 207 sc->ipsec_if.if_type = IFT_IPSEC; 208 sc->ipsec_if.if_dlt = DLT_NULL; 209 sc->ipsec_if.if_softc = sc; 210 IFQ_SET_READY(&sc->ipsec_if.if_snd); 211 if_initialize(&sc->ipsec_if); 212 if_alloc_sadl(&sc->ipsec_if); 213 bpf_attach(&sc->ipsec_if, DLT_NULL, sizeof(u_int)); 214 if_register(&sc->ipsec_if); 215 } 216 217 static void 218 if_ipsec_ro_init_pc(void *p, void *arg __unused, struct cpu_info *ci __unused) 219 { 220 struct ipsec_ro *iro = p; 221 222 iro->ir_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NONE); 223 } 224 225 static void 226 if_ipsec_ro_fini_pc(void *p, void *arg __unused, struct cpu_info *ci __unused) 227 { 228 struct ipsec_ro *iro = p; 229 230 rtcache_free(&iro->ir_ro); 231 232 mutex_obj_free(iro->ir_lock); 233 } 234 235 static int 236 if_ipsec_clone_destroy(struct ifnet *ifp) 237 { 238 struct ipsec_softc *sc = ifp->if_softc; 239 struct ipsec_variant *var; 240 int bound; 241 242 mutex_enter(&ipsec_softcs.lock); 243 LIST_REMOVE(sc, ipsec_list); 244 mutex_exit(&ipsec_softcs.lock); 245 246 bound = curlwp_bind(); 247 if_ipsec_delete_tunnel(&sc->ipsec_if); 248 curlwp_bindx(bound); 249 250 bpf_detach(ifp); 251 if_detach(ifp); 252 253 percpu_foreach(sc->ipsec_ro_percpu, if_ipsec_ro_fini_pc, NULL); 254 percpu_free(sc->ipsec_ro_percpu, sizeof(struct ipsec_ro)); 255 256 pserialize_destroy(sc->ipsec_psz); 257 mutex_destroy(&sc->ipsec_lock); 258 259 var = sc->ipsec_var; 260 kmem_free(var, sizeof(*var)); 261 kmem_free(sc, sizeof(*sc)); 262 263 return 0; 264 } 265 266 static inline bool 267 if_ipsec_nat_t(struct ipsec_softc *sc) 268 { 269 270 return (sc->ipsec_if.if_flags & IFF_NAT_T) != 0; 271 } 272 273 static inline bool 274 if_ipsec_fwd_ipv6(struct ipsec_softc *sc) 275 { 276 277 return (sc->ipsec_if.if_flags & IFF_FWD_IPV6) != 0; 278 } 279 280 int 281 if_ipsec_encap_func(struct mbuf *m, int off, int proto, void *arg) 282 { 283 uint8_t v; 284 struct ipsec_softc *sc; 285 struct ipsec_variant *var = NULL; 286 struct psref psref; 287 int ret = 0; 288 289 sc = arg; 290 KASSERT(sc != NULL); 291 292 if ((sc->ipsec_if.if_flags & IFF_UP) == 0) 293 goto out; 294 295 var = if_ipsec_getref_variant(sc, &psref); 296 if (if_ipsec_variant_is_unconfigured(var)) 297 goto out; 298 299 switch (proto) { 300 case IPPROTO_IPV4: 301 case IPPROTO_IPV6: 302 break; 303 default: 304 goto out; 305 } 306 307 m_copydata(m, 0, sizeof(v), &v); 308 v = (v >> 4) & 0xff; /* Get the IP version number. */ 309 310 switch (v) { 311 #ifdef INET 312 case IPVERSION: { 313 struct ip ip; 314 315 if (m->m_pkthdr.len < sizeof(ip)) 316 goto out; 317 318 m_copydata(m, 0, sizeof(ip), &ip); 319 if (var->iv_psrc->sa_family != AF_INET || 320 var->iv_pdst->sa_family != AF_INET) 321 goto out; 322 ret = ipsecif4_encap_func(m, &ip, var); 323 break; 324 } 325 #endif 326 #ifdef INET6 327 case (IPV6_VERSION >> 4): { 328 struct ip6_hdr ip6; 329 330 if (m->m_pkthdr.len < sizeof(ip6)) 331 goto out; 332 333 m_copydata(m, 0, sizeof(ip6), &ip6); 334 if (var->iv_psrc->sa_family != AF_INET6 || 335 var->iv_pdst->sa_family != AF_INET6) 336 goto out; 337 ret = ipsecif6_encap_func(m, &ip6, var); 338 break; 339 } 340 #endif 341 default: 342 goto out; 343 } 344 345 out: 346 if (var != NULL) 347 if_ipsec_putref_variant(var, &psref); 348 return ret; 349 } 350 351 /* 352 * ipsec(4) I/F may cause infinite recursion calls when misconfigured. 353 * We'll prevent this by introducing upper limit. 354 */ 355 static int 356 if_ipsec_check_nesting(struct ifnet *ifp, struct mbuf *m) 357 { 358 359 return if_tunnel_check_nesting(ifp, m, max_ipsec_nesting); 360 } 361 362 int 363 if_ipsec_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 364 const struct rtentry *rt) 365 { 366 struct ipsec_softc *sc = ifp->if_softc; 367 struct ipsec_variant *var; 368 struct psref psref; 369 int error; 370 int bound; 371 372 IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family); 373 374 error = if_ipsec_check_nesting(ifp, m); 375 if (error) { 376 m_freem(m); 377 goto noref_end; 378 } 379 380 if ((ifp->if_flags & IFF_UP) == 0) { 381 m_freem(m); 382 error = ENETDOWN; 383 goto noref_end; 384 } 385 386 387 bound = curlwp_bind(); 388 var = if_ipsec_getref_variant(sc, &psref); 389 if (if_ipsec_variant_is_unconfigured(var)) { 390 m_freem(m); 391 error = ENETDOWN; 392 goto end; 393 } 394 395 m->m_flags &= ~(M_BCAST|M_MCAST); 396 397 /* use DLT_NULL encapsulation here to pass inner af type */ 398 M_PREPEND(m, sizeof(int), M_DONTWAIT); 399 if (!m) { 400 error = ENOBUFS; 401 goto end; 402 } 403 *mtod(m, int *) = dst->sa_family; 404 405 #if INET6 406 /* drop IPv6 packet if IFF_FWD_IPV6 is not set */ 407 if (dst->sa_family == AF_INET6 && 408 !if_ipsec_fwd_ipv6(sc)) { 409 /* 410 * IPv6 packet is not allowed to forward,that is not error. 411 */ 412 error = 0; 413 IF_DROP(&ifp->if_snd); 414 m_freem(m); 415 goto end; 416 } 417 #endif 418 419 error = if_ipsec_out_direct(var, m, dst->sa_family); 420 421 end: 422 if_ipsec_putref_variant(var, &psref); 423 curlwp_bindx(bound); 424 noref_end: 425 if (error) 426 ifp->if_oerrors++; 427 428 return error; 429 } 430 431 static inline int 432 if_ipsec_out_direct(struct ipsec_variant *var, struct mbuf *m, int family) 433 { 434 struct ifnet *ifp = &var->iv_softc->ipsec_if; 435 int error; 436 int len; 437 438 KASSERT(if_ipsec_heldref_variant(var)); 439 KASSERT(var->iv_output != NULL); 440 441 len = m->m_pkthdr.len; 442 443 /* input DLT_NULL frame to BPF */ 444 bpf_mtap(ifp, m); 445 446 /* grab and chop off inner af type */ 447 /* XXX need pullup? */ 448 m_adj(m, sizeof(int)); 449 450 error = var->iv_output(var, family, m); 451 if (error) 452 return error; 453 454 ifp->if_opackets++; 455 ifp->if_obytes += len; 456 457 return 0; 458 } 459 460 void 461 if_ipsec_input(struct mbuf *m, int af, struct ifnet *ifp) 462 { 463 464 KASSERT(ifp != NULL); 465 466 m_set_rcvif(m, ifp); 467 468 bpf_mtap_af(ifp, af, m); 469 470 if_ipsec_in_enqueue(m, af, ifp); 471 472 return; 473 } 474 475 static inline void 476 if_ipsec_in_enqueue(struct mbuf *m, int af, struct ifnet *ifp) 477 { 478 pktqueue_t *pktq; 479 int pktlen; 480 481 /* 482 * Put the packet to the network layer input queue according to the 483 * specified address family. 484 */ 485 switch (af) { 486 #ifdef INET 487 case AF_INET: 488 pktq = ip_pktq; 489 break; 490 #endif 491 #ifdef INET6 492 case AF_INET6: 493 pktq = ip6_pktq; 494 break; 495 #endif 496 default: 497 ifp->if_ierrors++; 498 m_freem(m); 499 return; 500 } 501 502 #if 1 503 const u_int h = curcpu()->ci_index; 504 #else 505 const uint32_t h = pktq_rps_hash(m); 506 #endif 507 pktlen = m->m_pkthdr.len; 508 if (__predict_true(pktq_enqueue(pktq, m, h))) { 509 ifp->if_ibytes += pktlen; 510 ifp->if_ipackets++; 511 } else { 512 m_freem(m); 513 } 514 515 return; 516 } 517 518 static inline int 519 if_ipsec_check_salen(struct sockaddr *addr) 520 { 521 522 switch (addr->sa_family) { 523 #ifdef INET 524 case AF_INET: 525 if (addr->sa_len != sizeof(struct sockaddr_in)) 526 return EINVAL; 527 break; 528 #endif /* INET */ 529 #ifdef INET6 530 case AF_INET6: 531 if (addr->sa_len != sizeof(struct sockaddr_in6)) 532 return EINVAL; 533 break; 534 #endif /* INET6 */ 535 default: 536 return EAFNOSUPPORT; 537 } 538 539 return 0; 540 } 541 542 /* XXX how should we handle IPv6 scope on SIOC[GS]IFPHYADDR? */ 543 int 544 if_ipsec_ioctl(struct ifnet *ifp, u_long cmd, void *data) 545 { 546 struct ipsec_softc *sc = ifp->if_softc; 547 struct ipsec_variant *var = NULL; 548 struct ifreq *ifr = (struct ifreq*)data; 549 struct ifaddr *ifa = (struct ifaddr*)data; 550 int error = 0, size; 551 struct sockaddr *dst, *src; 552 u_long mtu; 553 short oflags = ifp->if_flags; 554 int bound; 555 struct psref psref; 556 557 switch (cmd) { 558 case SIOCINITIFADDR: 559 ifp->if_flags |= IFF_UP; 560 ifa->ifa_rtrequest = p2p_rtrequest; 561 break; 562 563 case SIOCSIFDSTADDR: 564 break; 565 566 case SIOCADDMULTI: 567 case SIOCDELMULTI: 568 switch (ifr->ifr_addr.sa_family) { 569 #ifdef INET 570 case AF_INET: /* IP supports Multicast */ 571 break; 572 #endif /* INET */ 573 #ifdef INET6 574 case AF_INET6: /* IP6 supports Multicast */ 575 break; 576 #endif /* INET6 */ 577 default: /* Other protocols doesn't support Multicast */ 578 error = EAFNOSUPPORT; 579 break; 580 } 581 break; 582 583 case SIOCSIFMTU: 584 mtu = ifr->ifr_mtu; 585 if (mtu < IPSEC_MTU_MIN || mtu > IPSEC_MTU_MAX) 586 return EINVAL; 587 else if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 588 error = 0; 589 break; 590 591 #ifdef INET 592 case SIOCSIFPHYADDR: 593 #endif 594 #ifdef INET6 595 case SIOCSIFPHYADDR_IN6: 596 #endif /* INET6 */ 597 case SIOCSLIFPHYADDR: 598 switch (cmd) { 599 #ifdef INET 600 case SIOCSIFPHYADDR: 601 src = (struct sockaddr *) 602 &(((struct in_aliasreq *)data)->ifra_addr); 603 dst = (struct sockaddr *) 604 &(((struct in_aliasreq *)data)->ifra_dstaddr); 605 break; 606 #endif /* INET */ 607 #ifdef INET6 608 case SIOCSIFPHYADDR_IN6: 609 src = (struct sockaddr *) 610 &(((struct in6_aliasreq *)data)->ifra_addr); 611 dst = (struct sockaddr *) 612 &(((struct in6_aliasreq *)data)->ifra_dstaddr); 613 break; 614 #endif /* INET6 */ 615 case SIOCSLIFPHYADDR: 616 src = (struct sockaddr *) 617 &(((struct if_laddrreq *)data)->addr); 618 dst = (struct sockaddr *) 619 &(((struct if_laddrreq *)data)->dstaddr); 620 break; 621 default: 622 return EINVAL; 623 } 624 625 /* sa_family must be equal */ 626 if (src->sa_family != dst->sa_family) 627 return EINVAL; 628 629 error = if_ipsec_check_salen(src); 630 if (error) 631 return error; 632 error = if_ipsec_check_salen(dst); 633 if (error) 634 return error; 635 636 /* check sa_family looks sane for the cmd */ 637 switch (cmd) { 638 #ifdef INET 639 case SIOCSIFPHYADDR: 640 if (src->sa_family == AF_INET) 641 break; 642 return EAFNOSUPPORT; 643 #endif /* INET */ 644 #ifdef INET6 645 case SIOCSIFPHYADDR_IN6: 646 if (src->sa_family == AF_INET6) 647 break; 648 return EAFNOSUPPORT; 649 #endif /* INET6 */ 650 case SIOCSLIFPHYADDR: 651 /* checks done in the above */ 652 break; 653 } 654 /* 655 * calls if_ipsec_getref_variant() for other softcs to check 656 * address pair duplicattion 657 */ 658 bound = curlwp_bind(); 659 error = if_ipsec_set_tunnel(&sc->ipsec_if, src, dst); 660 if (error) 661 goto bad; 662 curlwp_bindx(bound); 663 break; 664 665 case SIOCDIFPHYADDR: 666 bound = curlwp_bind(); 667 if_ipsec_delete_tunnel(&sc->ipsec_if); 668 curlwp_bindx(bound); 669 break; 670 671 case SIOCGIFPSRCADDR: 672 #ifdef INET6 673 case SIOCGIFPSRCADDR_IN6: 674 #endif /* INET6 */ 675 bound = curlwp_bind(); 676 var = if_ipsec_getref_variant(sc, &psref); 677 if (var->iv_psrc == NULL) { 678 error = EADDRNOTAVAIL; 679 goto bad; 680 } 681 src = var->iv_psrc; 682 switch (cmd) { 683 #ifdef INET 684 case SIOCGIFPSRCADDR: 685 dst = &ifr->ifr_addr; 686 size = sizeof(ifr->ifr_addr); 687 break; 688 #endif /* INET */ 689 #ifdef INET6 690 case SIOCGIFPSRCADDR_IN6: 691 dst = (struct sockaddr *) 692 &(((struct in6_ifreq *)data)->ifr_addr); 693 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 694 break; 695 #endif /* INET6 */ 696 default: 697 error = EADDRNOTAVAIL; 698 goto bad; 699 } 700 if (src->sa_len > size) { 701 error = EINVAL; 702 goto bad; 703 } 704 error = IF_IPSEC_GATHER_PSRC_ADDR_PORT(var, dst); 705 if (error) 706 goto bad; 707 if_ipsec_putref_variant(var, &psref); 708 curlwp_bindx(bound); 709 break; 710 711 case SIOCGIFPDSTADDR: 712 #ifdef INET6 713 case SIOCGIFPDSTADDR_IN6: 714 #endif /* INET6 */ 715 bound = curlwp_bind(); 716 var = if_ipsec_getref_variant(sc, &psref); 717 if (var->iv_pdst == NULL) { 718 error = EADDRNOTAVAIL; 719 goto bad; 720 } 721 src = var->iv_pdst; 722 switch (cmd) { 723 #ifdef INET 724 case SIOCGIFPDSTADDR: 725 dst = &ifr->ifr_addr; 726 size = sizeof(ifr->ifr_addr); 727 break; 728 #endif /* INET */ 729 #ifdef INET6 730 case SIOCGIFPDSTADDR_IN6: 731 dst = (struct sockaddr *) 732 &(((struct in6_ifreq *)data)->ifr_addr); 733 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 734 break; 735 #endif /* INET6 */ 736 default: 737 error = EADDRNOTAVAIL; 738 goto bad; 739 } 740 if (src->sa_len > size) { 741 error = EINVAL; 742 goto bad; 743 } 744 error = IF_IPSEC_GATHER_PDST_ADDR_PORT(var, dst); 745 if (error) 746 goto bad; 747 if_ipsec_putref_variant(var, &psref); 748 curlwp_bindx(bound); 749 break; 750 751 case SIOCGLIFPHYADDR: 752 bound = curlwp_bind(); 753 var = if_ipsec_getref_variant(sc, &psref); 754 if (if_ipsec_variant_is_unconfigured(var)) { 755 error = EADDRNOTAVAIL; 756 goto bad; 757 } 758 759 /* copy src */ 760 src = var->iv_psrc; 761 dst = (struct sockaddr *) 762 &(((struct if_laddrreq *)data)->addr); 763 size = sizeof(((struct if_laddrreq *)data)->addr); 764 if (src->sa_len > size) { 765 error = EINVAL; 766 goto bad; 767 } 768 error = IF_IPSEC_GATHER_PSRC_ADDR_PORT(var, dst); 769 if (error) 770 goto bad; 771 772 /* copy dst */ 773 src = var->iv_pdst; 774 dst = (struct sockaddr *) 775 &(((struct if_laddrreq *)data)->dstaddr); 776 size = sizeof(((struct if_laddrreq *)data)->dstaddr); 777 if (src->sa_len > size) { 778 error = EINVAL; 779 goto bad; 780 } 781 error = IF_IPSEC_GATHER_PDST_ADDR_PORT(var, dst); 782 if (error) 783 goto bad; 784 if_ipsec_putref_variant(var, &psref); 785 curlwp_bindx(bound); 786 break; 787 788 default: 789 error = ifioctl_common(ifp, cmd, data); 790 if (!error) { 791 bound = curlwp_bind(); 792 error = if_ipsec_ensure_flags(&sc->ipsec_if, oflags); 793 if (error) 794 goto bad; 795 curlwp_bindx(bound); 796 } 797 break; 798 } 799 return error; 800 801 bad: 802 if (var != NULL) 803 if_ipsec_putref_variant(var, &psref); 804 curlwp_bindx(bound); 805 806 return error; 807 } 808 809 struct encap_funcs { 810 #ifdef INET 811 int (*ef_inet)(struct ipsec_variant *); 812 #endif 813 #ifdef INET6 814 int (*ef_inet6)(struct ipsec_variant *); 815 #endif 816 }; 817 818 static struct encap_funcs ipsec_encap_attach = { 819 #ifdef INET 820 .ef_inet = ipsecif4_attach, 821 #endif 822 #ifdef INET6 823 .ef_inet6 = &ipsecif6_attach, 824 #endif 825 }; 826 827 static struct encap_funcs ipsec_encap_detach = { 828 #ifdef INET 829 .ef_inet = ipsecif4_detach, 830 #endif 831 #ifdef INET6 832 .ef_inet6 = &ipsecif6_detach, 833 #endif 834 }; 835 836 static int 837 if_ipsec_encap_common(struct ipsec_variant *var, struct encap_funcs *funcs) 838 { 839 int error; 840 841 KASSERT(var != NULL); 842 KASSERT(if_ipsec_variant_is_configured(var)); 843 844 switch (var->iv_psrc->sa_family) { 845 #ifdef INET 846 case AF_INET: 847 error = (funcs->ef_inet)(var); 848 break; 849 #endif /* INET */ 850 #ifdef INET6 851 case AF_INET6: 852 error = (funcs->ef_inet6)(var); 853 break; 854 #endif /* INET6 */ 855 default: 856 error = EINVAL; 857 break; 858 } 859 860 return error; 861 } 862 863 static int 864 if_ipsec_encap_attach(struct ipsec_variant *var) 865 { 866 867 return if_ipsec_encap_common(var, &ipsec_encap_attach); 868 } 869 870 static int 871 if_ipsec_encap_detach(struct ipsec_variant *var) 872 { 873 874 return if_ipsec_encap_common(var, &ipsec_encap_detach); 875 } 876 877 /* 878 * Validate and set ipsec(4) I/F configurations. 879 * (1) validate 880 * (1-1) Check the argument src and dst address pair will change 881 * configuration from current src and dst address pair. 882 * (1-2) Check any ipsec(4) I/F uses duplicated src and dst address pair 883 * with argument src and dst address pair, except for NAT-T shared 884 * tunnels. 885 * (2) set 886 * (2-1) Create variant for new configuration. 887 * (2-2) Create temporary "null" variant used to avoid to access 888 * dangling variant while SPs are deleted and added. 889 * (2-3) Swap variant include its SPs. 890 * (2-4) Cleanup last configurations. 891 */ 892 static int 893 if_ipsec_set_tunnel(struct ifnet *ifp, 894 struct sockaddr *src, struct sockaddr *dst) 895 { 896 struct ipsec_softc *sc = ifp->if_softc; 897 struct ipsec_softc *sc2; 898 struct ipsec_variant *ovar, *nvar, *nullvar; 899 struct sockaddr *osrc, *odst; 900 struct sockaddr *nsrc, *ndst; 901 in_port_t nsport = 0, ndport = 0; 902 int error; 903 904 error = encap_lock_enter(); 905 if (error) 906 return error; 907 908 nsrc = sockaddr_dup(src, M_WAITOK); 909 ndst = sockaddr_dup(dst, M_WAITOK); 910 nvar = kmem_zalloc(sizeof(*nvar), KM_SLEEP); 911 nullvar = kmem_zalloc(sizeof(*nullvar), KM_SLEEP); 912 913 mutex_enter(&sc->ipsec_lock); 914 915 ovar = sc->ipsec_var; 916 917 switch(nsrc->sa_family) { 918 #ifdef INET 919 case AF_INET: 920 nsport = satosin(src)->sin_port; 921 /* 922 * avoid confuse SP when NAT-T disabled, 923 * e.g. 924 * expected: 10.0.1.2[any] 10.0.1.1[any] 4(ipv4) 925 * confuse : 10.0.1.2[600] 10.0.1.1[600] 4(ipv4) 926 */ 927 satosin(nsrc)->sin_port = 0; 928 ndport = satosin(dst)->sin_port; 929 satosin(ndst)->sin_port = 0; 930 break; 931 #endif /* INET */ 932 #ifdef INET6 933 case AF_INET6: 934 nsport = satosin6(src)->sin6_port; 935 satosin6(nsrc)->sin6_port = 0; 936 ndport = satosin6(dst)->sin6_port; 937 satosin6(ndst)->sin6_port = 0; 938 break; 939 #endif /* INET6 */ 940 default: 941 log(LOG_DEBUG, 942 "%s: Invalid address family: %d.\n", 943 __func__, src->sa_family); 944 error = EINVAL; 945 goto out; 946 } 947 948 /* 949 * (1-1) Check the argument src and dst address pair will change 950 * configuration from current src and dst address pair. 951 */ 952 if ((ovar->iv_pdst && sockaddr_cmp(ovar->iv_pdst, dst) == 0) && 953 (ovar->iv_psrc && sockaddr_cmp(ovar->iv_psrc, src) == 0) && 954 (ovar->iv_sport == nsport && ovar->iv_dport == ndport)) { 955 /* address and port pair not changed. */ 956 error = 0; 957 goto out; 958 } 959 960 /* 961 * (1-2) Check any ipsec(4) I/F uses duplicated src and dst address pair 962 * with argument src and dst address pair, except for NAT-T shared 963 * tunnels. 964 */ 965 mutex_enter(&ipsec_softcs.lock); 966 LIST_FOREACH(sc2, &ipsec_softcs.list, ipsec_list) { 967 struct ipsec_variant *var2; 968 struct psref psref; 969 970 if (sc2 == sc) 971 continue; 972 var2 = if_ipsec_getref_variant(sc2, &psref); 973 if (if_ipsec_variant_is_unconfigured(var2)) { 974 if_ipsec_putref_variant(var2, &psref); 975 continue; 976 } 977 if (if_ipsec_nat_t(sc) || if_ipsec_nat_t(sc2)) { 978 if_ipsec_putref_variant(var2, &psref); 979 continue; /* NAT-T shared tunnel */ 980 } 981 if (sockaddr_cmp(var2->iv_pdst, dst) == 0 && 982 sockaddr_cmp(var2->iv_psrc, src) == 0) { 983 if_ipsec_putref_variant(var2, &psref); 984 mutex_exit(&ipsec_softcs.lock); 985 error = EADDRNOTAVAIL; 986 goto out; 987 } 988 989 if_ipsec_putref_variant(var2, &psref); 990 /* XXX both end must be valid? (I mean, not 0.0.0.0) */ 991 } 992 mutex_exit(&ipsec_softcs.lock); 993 994 995 osrc = ovar->iv_psrc; 996 odst = ovar->iv_pdst; 997 998 /* 999 * (2-1) Create ipsec_variant for new configuration. 1000 */ 1001 if_ipsec_copy_variant(nvar, ovar); 1002 nvar->iv_psrc = nsrc; 1003 nvar->iv_pdst = ndst; 1004 nvar->iv_sport = nsport; 1005 nvar->iv_dport = ndport; 1006 nvar->iv_encap_cookie4 = NULL; 1007 nvar->iv_encap_cookie6 = NULL; 1008 psref_target_init(&nvar->iv_psref, iv_psref_class); 1009 error = if_ipsec_encap_attach(nvar); 1010 if (error) 1011 goto out; 1012 1013 /* 1014 * (2-2) Create temporary "null" variant. 1015 */ 1016 if_ipsec_copy_variant(nullvar, ovar); 1017 if_ipsec_clear_config(nullvar); 1018 psref_target_init(&nullvar->iv_psref, iv_psref_class); 1019 membar_producer(); 1020 /* 1021 * (2-3) Swap variant include its SPs. 1022 */ 1023 error = if_ipsec_update_variant(sc, nvar, nullvar); 1024 if (error) { 1025 if_ipsec_encap_detach(nvar); 1026 goto out; 1027 } 1028 1029 mutex_exit(&sc->ipsec_lock); 1030 1031 /* 1032 * (2-4) Cleanup last configurations. 1033 */ 1034 if (if_ipsec_variant_is_configured(ovar)) 1035 if_ipsec_encap_detach(ovar); 1036 encap_lock_exit(); 1037 1038 if (osrc != NULL) 1039 sockaddr_free(osrc); 1040 if (odst != NULL) 1041 sockaddr_free(odst); 1042 kmem_free(ovar, sizeof(*ovar)); 1043 kmem_free(nullvar, sizeof(*nullvar)); 1044 1045 return 0; 1046 1047 out: 1048 mutex_exit(&sc->ipsec_lock); 1049 encap_lock_exit(); 1050 1051 sockaddr_free(nsrc); 1052 sockaddr_free(ndst); 1053 kmem_free(nvar, sizeof(*nvar)); 1054 kmem_free(nullvar, sizeof(*nullvar)); 1055 1056 return error; 1057 } 1058 1059 /* 1060 * Validate and delete ipsec(4) I/F configurations. 1061 * (1) validate 1062 * (1-1) Check current src and dst address pair are null, 1063 * which means the ipsec(4) I/F is already done deletetunnel. 1064 * (2) delete 1065 * (2-1) Create variant for deleted status. 1066 * (2-2) Create temporary "null" variant used to avoid to access 1067 * dangling variant while SPs are deleted and added. 1068 * NOTE: 1069 * The contents of temporary "null" variant equal to the variant 1070 * of (2-1), however two psref_target_destroy() synchronization 1071 * points are necessary to avoid to access dangling variant 1072 * while SPs are deleted and added. To implement that simply, 1073 * we use the same manner as if_ipsec_set_tunnel(), that is, 1074 * create extra "null" variant and use it temporarily. 1075 * (2-3) Swap variant include its SPs. 1076 * (2-4) Cleanup last configurations. 1077 */ 1078 static void 1079 if_ipsec_delete_tunnel(struct ifnet *ifp) 1080 { 1081 struct ipsec_softc *sc = ifp->if_softc; 1082 struct ipsec_variant *ovar, *nvar, *nullvar; 1083 struct sockaddr *osrc, *odst; 1084 int error; 1085 1086 error = encap_lock_enter(); 1087 if (error) 1088 return; 1089 1090 nvar = kmem_zalloc(sizeof(*nvar), KM_SLEEP); 1091 nullvar = kmem_zalloc(sizeof(*nullvar), KM_SLEEP); 1092 1093 mutex_enter(&sc->ipsec_lock); 1094 1095 ovar = sc->ipsec_var; 1096 osrc = ovar->iv_psrc; 1097 odst = ovar->iv_pdst; 1098 /* 1099 * (1-1) Check current src and dst address pair are null, 1100 * which means the ipsec(4) I/F is already done deletetunnel. 1101 */ 1102 if (osrc == NULL || odst == NULL) { 1103 /* address pair not changed. */ 1104 mutex_exit(&sc->ipsec_lock); 1105 encap_lock_exit(); 1106 kmem_free(nvar, sizeof(*nvar)); 1107 kmem_free(nullvar, sizeof(*nullvar)); 1108 return; 1109 } 1110 1111 /* 1112 * (2-1) Create variant for deleted status. 1113 */ 1114 if_ipsec_copy_variant(nvar, ovar); 1115 if_ipsec_clear_config(nvar); 1116 psref_target_init(&nvar->iv_psref, iv_psref_class); 1117 1118 /* 1119 * (2-2) Create temporary "null" variant used to avoid to access 1120 * dangling variant while SPs are deleted and added. 1121 */ 1122 if_ipsec_copy_variant(nullvar, ovar); 1123 if_ipsec_clear_config(nullvar); 1124 psref_target_init(&nullvar->iv_psref, iv_psref_class); 1125 membar_producer(); 1126 /* 1127 * (2-3) Swap variant include its SPs. 1128 */ 1129 /* if_ipsec_update_variant() does not fail when delete SP only. */ 1130 (void)if_ipsec_update_variant(sc, nvar, nullvar); 1131 1132 mutex_exit(&sc->ipsec_lock); 1133 1134 /* 1135 * (2-4) Cleanup last configurations. 1136 */ 1137 if (if_ipsec_variant_is_configured(ovar)) 1138 if_ipsec_encap_detach(ovar); 1139 encap_lock_exit(); 1140 1141 sockaddr_free(osrc); 1142 sockaddr_free(odst); 1143 kmem_free(ovar, sizeof(*ovar)); 1144 kmem_free(nullvar, sizeof(*nullvar)); 1145 } 1146 1147 /* 1148 * Check IFF_NAT_T and IFF_FWD_IPV6 flags, therefore update SPs if needed. 1149 * (1) check 1150 * (1-1) Check flags are changed. 1151 * (1-2) Check current src and dst address pair. If they are null, 1152 * that means the ipsec(4) I/F is deletetunnel'ed, so it is 1153 * not needed to update. 1154 * (2) update 1155 * (2-1) Create variant for new SPs. 1156 * (2-2) Create temporary "null" variant used to avoid to access 1157 * dangling variant while SPs are deleted and added. 1158 * NOTE: 1159 * There is the same problem as if_ipsec_delete_tunnel(). 1160 * (2-3) Swap variant include its SPs. 1161 * (2-4) Cleanup unused configurations. 1162 * NOTE: use the same encap_cookies. 1163 */ 1164 static int 1165 if_ipsec_ensure_flags(struct ifnet *ifp, short oflags) 1166 { 1167 struct ipsec_softc *sc = ifp->if_softc; 1168 struct ipsec_variant *ovar, *nvar, *nullvar; 1169 int error; 1170 1171 /* 1172 * (1) Check flags are changed. 1173 */ 1174 if ((oflags & (IFF_NAT_T|IFF_FWD_IPV6)) == 1175 (ifp->if_flags & (IFF_NAT_T|IFF_FWD_IPV6))) 1176 return 0; /* flags not changed. */ 1177 1178 error = encap_lock_enter(); 1179 if (error) 1180 return error; 1181 1182 nvar = kmem_zalloc(sizeof(*nvar), KM_SLEEP); 1183 nullvar = kmem_zalloc(sizeof(*nullvar), KM_SLEEP); 1184 1185 mutex_enter(&sc->ipsec_lock); 1186 1187 ovar = sc->ipsec_var; 1188 /* 1189 * (1-2) Check current src and dst address pair. 1190 */ 1191 if (if_ipsec_variant_is_unconfigured(ovar)) { 1192 /* nothing to do */ 1193 mutex_exit(&sc->ipsec_lock); 1194 encap_lock_exit(); 1195 kmem_free(nvar, sizeof(*nvar)); 1196 kmem_free(nullvar, sizeof(*nullvar)); 1197 return 0; 1198 } 1199 1200 /* 1201 * (2-1) Create variant for new SPs. 1202 */ 1203 if_ipsec_copy_variant(nvar, ovar); 1204 psref_target_init(&nvar->iv_psref, iv_psref_class); 1205 /* 1206 * (2-2) Create temporary "null" variant used to avoid to access 1207 * dangling variant while SPs are deleted and added. 1208 */ 1209 if_ipsec_copy_variant(nullvar, ovar); 1210 if_ipsec_clear_config(nullvar); 1211 psref_target_init(&nullvar->iv_psref, iv_psref_class); 1212 membar_producer(); 1213 /* 1214 * (2-3) Swap variant include its SPs. 1215 */ 1216 error = if_ipsec_update_variant(sc, nvar, nullvar); 1217 1218 mutex_exit(&sc->ipsec_lock); 1219 encap_lock_exit(); 1220 1221 /* 1222 * (2-4) Cleanup unused configurations. 1223 */ 1224 if (!error) 1225 kmem_free(ovar, sizeof(*ovar)); 1226 else 1227 kmem_free(nvar, sizeof(*ovar)); 1228 kmem_free(nullvar, sizeof(*nullvar)); 1229 1230 return error; 1231 } 1232 1233 /* 1234 * SPD management 1235 */ 1236 1237 /* 1238 * Share SP set with other NAT-T ipsec(4) I/F(s). 1239 * Return 1, when "var" shares SP set. 1240 * Return 0, when "var" cannot share SP set. 1241 * 1242 * NOTE: 1243 * if_ipsec_share_sp() and if_ipsec_unshare_sp() would require global lock 1244 * to exclude other ipsec(4) I/Fs set_tunnel/delete_tunnel. E.g. when ipsec0 1245 * and ipsec1 can share SP set, running ipsec0's set_tunnel and ipsec1's 1246 * set_tunnel causes race. 1247 * Currently, (fortunately) encap_lock works as this global lock. 1248 */ 1249 static int 1250 if_ipsec_share_sp(struct ipsec_variant *var) 1251 { 1252 struct ipsec_softc *sc = var->iv_softc; 1253 struct ipsec_softc *sc2; 1254 struct ipsec_variant *var2; 1255 struct psref psref; 1256 1257 KASSERT(encap_lock_held()); 1258 KASSERT(var->iv_psrc != NULL && var->iv_pdst != NULL); 1259 1260 mutex_enter(&ipsec_softcs.lock); 1261 LIST_FOREACH(sc2, &ipsec_softcs.list, ipsec_list) { 1262 if (sc2 == sc) 1263 continue; 1264 var2 = if_ipsec_getref_variant(sc2, &psref); 1265 if (if_ipsec_variant_is_unconfigured(var2)) { 1266 if_ipsec_putref_variant(var2, &psref); 1267 continue; 1268 } 1269 if (sockaddr_cmp(var2->iv_pdst, var->iv_pdst) != 0 || 1270 sockaddr_cmp(var2->iv_psrc, var->iv_psrc) != 0) { 1271 if_ipsec_putref_variant(var2, &psref); 1272 continue; 1273 } 1274 1275 break; 1276 } 1277 mutex_exit(&ipsec_softcs.lock); 1278 if (sc2 == NULL) 1279 return 0; /* not shared */ 1280 1281 IV_SP_IN(var) = IV_SP_IN(var2); 1282 IV_SP_IN6(var) = IV_SP_IN6(var2); 1283 IV_SP_OUT(var) = IV_SP_OUT(var2); 1284 IV_SP_OUT6(var) = IV_SP_OUT6(var2); 1285 1286 if_ipsec_putref_variant(var2, &psref); 1287 return 1; /* shared */ 1288 } 1289 1290 /* 1291 * Unshare SP set with other NAT-T ipsec(4) I/F(s). 1292 * Return 1, when "var" shared SP set, and then unshare them. 1293 * Return 0, when "var" did not share SP set. 1294 * 1295 * NOTE: 1296 * See if_ipsec_share_sp()'s note. 1297 */ 1298 static int 1299 if_ipsec_unshare_sp(struct ipsec_variant *var) 1300 { 1301 struct ipsec_softc *sc = var->iv_softc; 1302 struct ipsec_softc *sc2; 1303 struct ipsec_variant *var2; 1304 struct psref psref; 1305 1306 KASSERT(encap_lock_held()); 1307 1308 if (!var->iv_pdst || !var->iv_psrc) 1309 return 0; 1310 1311 mutex_enter(&ipsec_softcs.lock); 1312 LIST_FOREACH(sc2, &ipsec_softcs.list, ipsec_list) { 1313 if (sc2 == sc) 1314 continue; 1315 var2 = if_ipsec_getref_variant(sc2, &psref); 1316 if (!var2->iv_pdst || !var2->iv_psrc) { 1317 if_ipsec_putref_variant(var2, &psref); 1318 continue; 1319 } 1320 if (sockaddr_cmp(var2->iv_pdst, var->iv_pdst) != 0 || 1321 sockaddr_cmp(var2->iv_psrc, var->iv_psrc) != 0) { 1322 if_ipsec_putref_variant(var2, &psref); 1323 continue; 1324 } 1325 1326 break; 1327 } 1328 mutex_exit(&ipsec_softcs.lock); 1329 if (sc2 == NULL) 1330 return 0; /* not shared */ 1331 1332 IV_SP_IN(var) = NULL; 1333 IV_SP_IN6(var) = NULL; 1334 IV_SP_OUT(var) = NULL; 1335 IV_SP_OUT6(var) = NULL; 1336 if_ipsec_putref_variant(var2, &psref); 1337 return 1; /* shared */ 1338 } 1339 1340 static inline void 1341 if_ipsec_add_mbuf_optalign(struct mbuf *m0, void *data, size_t len, bool align) 1342 { 1343 struct mbuf *m; 1344 1345 MGET(m, M_WAIT, MT_DATA); 1346 if (align) { 1347 m->m_len = PFKEY_ALIGN8(len); 1348 memset(mtod(m, void *), 0, m->m_len); 1349 } else 1350 m->m_len = len; 1351 m_copyback(m, 0, len, data); 1352 m_cat(m0, m); 1353 } 1354 1355 static inline void 1356 if_ipsec_add_mbuf(struct mbuf *m0, void *data, size_t len) 1357 { 1358 1359 if_ipsec_add_mbuf_optalign(m0, data, len, true); 1360 } 1361 1362 static inline void 1363 if_ipsec_add_mbuf_addr_port(struct mbuf *m0, struct sockaddr *addr, in_port_t port, bool align) 1364 { 1365 1366 if (port == 0) { 1367 if_ipsec_add_mbuf_optalign(m0, addr, addr->sa_len, align); 1368 } else { 1369 union sockaddr_union addrport_u; 1370 struct sockaddr *addrport = &addrport_u.sa; 1371 1372 if_ipsec_set_addr_port(addrport, addr, port); 1373 if_ipsec_add_mbuf_optalign(m0, addrport, addrport->sa_len, align); 1374 } 1375 } 1376 1377 static inline void 1378 if_ipsec_add_pad(struct mbuf *m0, size_t len) 1379 { 1380 struct mbuf *m; 1381 1382 if (len == 0) 1383 return; 1384 1385 MGET(m, M_WAIT, MT_DATA); 1386 m->m_len = len; 1387 memset(mtod(m, void *), 0, m->m_len); 1388 m_cat(m0, m); 1389 } 1390 1391 static inline size_t 1392 if_ipsec_set_sadb_addr(struct sadb_address *saaddr, struct sockaddr *addr, 1393 int proto, uint16_t exttype) 1394 { 1395 size_t size; 1396 1397 KASSERT(saaddr != NULL); 1398 KASSERT(addr != NULL); 1399 1400 size = sizeof(*saaddr) + PFKEY_ALIGN8(addr->sa_len); 1401 saaddr->sadb_address_len = PFKEY_UNIT64(size); 1402 saaddr->sadb_address_exttype = exttype; 1403 saaddr->sadb_address_proto = proto; 1404 switch (addr->sa_family) { 1405 #ifdef INET 1406 case AF_INET: 1407 saaddr->sadb_address_prefixlen = sizeof(struct in_addr) << 3; 1408 break; 1409 #endif /* INET */ 1410 #ifdef INET6 1411 case AF_INET6: 1412 saaddr->sadb_address_prefixlen = sizeof(struct in6_addr) << 3; 1413 break; 1414 #endif /* INET6 */ 1415 default: 1416 log(LOG_DEBUG, 1417 "%s: Invalid address family: %d.\n", 1418 __func__, addr->sa_family); 1419 break; 1420 } 1421 saaddr->sadb_address_reserved = 0; 1422 1423 return size; 1424 } 1425 1426 static inline size_t 1427 if_ipsec_set_sadb_src(struct sadb_address *sasrc, struct sockaddr *src, 1428 int proto) 1429 { 1430 1431 return if_ipsec_set_sadb_addr(sasrc, src, proto, 1432 SADB_EXT_ADDRESS_SRC); 1433 } 1434 1435 static inline size_t 1436 if_ipsec_set_sadb_dst(struct sadb_address *sadst, struct sockaddr *dst, 1437 int proto) 1438 { 1439 1440 return if_ipsec_set_sadb_addr(sadst, dst, proto, 1441 SADB_EXT_ADDRESS_DST); 1442 } 1443 1444 static inline size_t 1445 if_ipsec_set_sadb_x_policy(struct sadb_x_policy *xpl, 1446 struct sadb_x_ipsecrequest *xisr, uint16_t policy, uint8_t dir, uint32_t id, 1447 uint8_t level, struct sockaddr *src, struct sockaddr *dst) 1448 { 1449 size_t size; 1450 1451 KASSERT(policy != IPSEC_POLICY_IPSEC || xisr != NULL); 1452 1453 size = sizeof(*xpl); 1454 if (policy == IPSEC_POLICY_IPSEC) { 1455 size += PFKEY_ALIGN8(sizeof(*xisr)); 1456 if (src != NULL && dst != NULL) 1457 size += PFKEY_ALIGN8(src->sa_len + dst->sa_len); 1458 } 1459 xpl->sadb_x_policy_len = PFKEY_UNIT64(size); 1460 xpl->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 1461 xpl->sadb_x_policy_type = policy; 1462 xpl->sadb_x_policy_dir = dir; 1463 xpl->sadb_x_policy_reserved = 0; 1464 xpl->sadb_x_policy_id = id; 1465 xpl->sadb_x_policy_reserved2 = 0; 1466 1467 if (policy == IPSEC_POLICY_IPSEC) { 1468 xisr->sadb_x_ipsecrequest_len = PFKEY_ALIGN8(sizeof(*xisr)); 1469 if (src != NULL && dst != NULL) 1470 xisr->sadb_x_ipsecrequest_len += 1471 PFKEY_ALIGN8(src->sa_len + dst->sa_len); 1472 xisr->sadb_x_ipsecrequest_proto = IPPROTO_ESP; 1473 xisr->sadb_x_ipsecrequest_mode = IPSEC_MODE_TRANSPORT; 1474 xisr->sadb_x_ipsecrequest_level = level; 1475 xisr->sadb_x_ipsecrequest_reqid = key_newreqid(); 1476 } 1477 1478 return size; 1479 } 1480 1481 static inline void 1482 if_ipsec_set_sadb_msg(struct sadb_msg *msg, uint16_t extlen, uint8_t msgtype) 1483 { 1484 1485 KASSERT(msg != NULL); 1486 1487 msg->sadb_msg_version = PF_KEY_V2; 1488 msg->sadb_msg_type = msgtype; 1489 msg->sadb_msg_errno = 0; 1490 msg->sadb_msg_satype = SADB_SATYPE_UNSPEC; 1491 msg->sadb_msg_len = PFKEY_UNIT64(sizeof(*msg)) + extlen; 1492 msg->sadb_msg_reserved = 0; 1493 msg->sadb_msg_seq = 0; /* XXXX */ 1494 msg->sadb_msg_pid = 0; /* XXXX */ 1495 } 1496 1497 static inline void 1498 if_ipsec_set_sadb_msg_add(struct sadb_msg *msg, uint16_t extlen) 1499 { 1500 1501 if_ipsec_set_sadb_msg(msg, extlen, SADB_X_SPDADD); 1502 } 1503 1504 static inline void 1505 if_ipsec_set_sadb_msg_del(struct sadb_msg *msg, uint16_t extlen) 1506 { 1507 1508 if_ipsec_set_sadb_msg(msg, extlen, SADB_X_SPDDELETE2); 1509 } 1510 1511 static int 1512 if_ipsec_set_addr_port(struct sockaddr *addrport, struct sockaddr *addr, 1513 in_port_t port) 1514 { 1515 int error = 0; 1516 1517 sockaddr_copy(addrport, addr->sa_len, addr); 1518 1519 switch (addr->sa_family) { 1520 #ifdef INET 1521 case AF_INET: { 1522 struct sockaddr_in *sin = satosin(addrport); 1523 sin->sin_port = port; 1524 break; 1525 } 1526 #endif /* INET */ 1527 #ifdef INET6 1528 case AF_INET6: { 1529 struct sockaddr_in6 *sin6 = satosin6(addrport); 1530 sin6->sin6_port = port; 1531 break; 1532 } 1533 #endif /* INET6 */ 1534 default: 1535 log(LOG_DEBUG, 1536 "%s: Invalid address family: %d.\n", 1537 __func__, addr->sa_family); 1538 error = EINVAL; 1539 } 1540 1541 return error; 1542 } 1543 1544 static struct secpolicy * 1545 if_ipsec_add_sp0(struct sockaddr *src, in_port_t sport, 1546 struct sockaddr *dst, in_port_t dport, 1547 int dir, int proto, int level, u_int policy) 1548 { 1549 struct sadb_msg msg; 1550 struct sadb_address xsrc, xdst; 1551 struct sadb_x_policy xpl; 1552 struct sadb_x_ipsecrequest xisr; 1553 size_t size; 1554 size_t padlen; 1555 uint16_t ext_msg_len = 0; 1556 struct mbuf *m; 1557 1558 memset(&msg, 0, sizeof(msg)); 1559 memset(&xsrc, 0, sizeof(xsrc)); 1560 memset(&xdst, 0, sizeof(xdst)); 1561 memset(&xpl, 0, sizeof(xpl)); 1562 memset(&xisr, 0, sizeof(xisr)); 1563 1564 MGETHDR(m, M_WAIT, MT_DATA); 1565 1566 size = if_ipsec_set_sadb_src(&xsrc, src, proto); 1567 ext_msg_len += PFKEY_UNIT64(size); 1568 size = if_ipsec_set_sadb_dst(&xdst, dst, proto); 1569 ext_msg_len += PFKEY_UNIT64(size); 1570 size = if_ipsec_set_sadb_x_policy(&xpl, &xisr, policy, dir, 0, level, src, dst); 1571 ext_msg_len += PFKEY_UNIT64(size); 1572 if_ipsec_set_sadb_msg_add(&msg, ext_msg_len); 1573 1574 /* build PF_KEY message */ 1575 1576 m->m_len = sizeof(msg); 1577 m_copyback(m, 0, sizeof(msg), &msg); 1578 1579 if_ipsec_add_mbuf(m, &xsrc, sizeof(xsrc)); 1580 /* 1581 * secpolicy.spidx.{src, dst} must not be set port number, 1582 * even if it is used for NAT-T. 1583 */ 1584 if_ipsec_add_mbuf_addr_port(m, src, 0, true); 1585 padlen = PFKEY_UNUNIT64(xsrc.sadb_address_len) 1586 - (sizeof(xsrc) + PFKEY_ALIGN8(src->sa_len)); 1587 if_ipsec_add_pad(m, padlen); 1588 1589 if_ipsec_add_mbuf(m, &xdst, sizeof(xdst)); 1590 /* ditto */ 1591 if_ipsec_add_mbuf_addr_port(m, dst, 0, true); 1592 padlen = PFKEY_UNUNIT64(xdst.sadb_address_len) 1593 - (sizeof(xdst) + PFKEY_ALIGN8(dst->sa_len)); 1594 if_ipsec_add_pad(m, padlen); 1595 1596 if_ipsec_add_mbuf(m, &xpl, sizeof(xpl)); 1597 padlen = PFKEY_UNUNIT64(xpl.sadb_x_policy_len) - sizeof(xpl); 1598 if (policy == IPSEC_POLICY_IPSEC) { 1599 if_ipsec_add_mbuf(m, &xisr, sizeof(xisr)); 1600 /* 1601 * secpolicy.req->saidx.{src, dst} must be set port number, 1602 * when it is used for NAT-T. 1603 */ 1604 if_ipsec_add_mbuf_addr_port(m, src, sport, false); 1605 if_ipsec_add_mbuf_addr_port(m, dst, dport, false); 1606 padlen -= PFKEY_ALIGN8(sizeof(xisr)); 1607 padlen -= PFKEY_ALIGN8(src->sa_len + dst->sa_len); 1608 } 1609 if_ipsec_add_pad(m, padlen); 1610 1611 /* key_kpi_spdadd() has already done KEY_SP_REF(). */ 1612 return key_kpi_spdadd(m); 1613 } 1614 1615 static int 1616 if_ipsec_add_sp(struct ipsec_variant *var, 1617 struct sockaddr *src, in_port_t sport, 1618 struct sockaddr *dst, in_port_t dport) 1619 { 1620 struct ipsec_softc *sc = var->iv_softc; 1621 int level; 1622 u_int v6policy; 1623 1624 /* 1625 * must delete sp before add it. 1626 */ 1627 KASSERT(IV_SP_IN(var) == NULL); 1628 KASSERT(IV_SP_OUT(var) == NULL); 1629 KASSERT(IV_SP_IN6(var) == NULL); 1630 KASSERT(IV_SP_OUT6(var) == NULL); 1631 1632 /* 1633 * can be shared? 1634 */ 1635 if (if_ipsec_share_sp(var)) 1636 return 0; 1637 1638 if (if_ipsec_nat_t(sc)) 1639 level = IPSEC_LEVEL_REQUIRE; 1640 else 1641 level = IPSEC_LEVEL_UNIQUE; 1642 1643 if (if_ipsec_fwd_ipv6(sc)) 1644 v6policy = IPSEC_POLICY_IPSEC; 1645 else 1646 v6policy = IPSEC_POLICY_DISCARD; 1647 1648 IV_SP_IN(var) = if_ipsec_add_sp0(dst, dport, src, sport, 1649 IPSEC_DIR_INBOUND, IPPROTO_IPIP, level, IPSEC_POLICY_IPSEC); 1650 if (IV_SP_IN(var) == NULL) 1651 goto fail; 1652 IV_SP_OUT(var) = if_ipsec_add_sp0(src, sport, dst, dport, 1653 IPSEC_DIR_OUTBOUND, IPPROTO_IPIP, level, IPSEC_POLICY_IPSEC); 1654 if (IV_SP_OUT(var) == NULL) 1655 goto fail; 1656 IV_SP_IN6(var) = if_ipsec_add_sp0(dst, dport, src, sport, 1657 IPSEC_DIR_INBOUND, IPPROTO_IPV6, level, v6policy); 1658 if (IV_SP_IN6(var) == NULL) 1659 goto fail; 1660 IV_SP_OUT6(var) = if_ipsec_add_sp0(src, sport, dst, dport, 1661 IPSEC_DIR_OUTBOUND, IPPROTO_IPV6, level, v6policy); 1662 if (IV_SP_OUT6(var) == NULL) 1663 goto fail; 1664 1665 return 0; 1666 1667 fail: 1668 if (IV_SP_IN6(var) != NULL) { 1669 if_ipsec_del_sp0(IV_SP_IN6(var)); 1670 IV_SP_IN6(var) = NULL; 1671 } 1672 if (IV_SP_OUT(var) != NULL) { 1673 if_ipsec_del_sp0(IV_SP_OUT(var)); 1674 IV_SP_OUT(var) = NULL; 1675 } 1676 if (IV_SP_IN(var) != NULL) { 1677 if_ipsec_del_sp0(IV_SP_IN(var)); 1678 IV_SP_IN(var) = NULL; 1679 } 1680 1681 return EEXIST; 1682 } 1683 1684 static int 1685 if_ipsec_del_sp0(struct secpolicy *sp) 1686 { 1687 struct sadb_msg msg; 1688 struct sadb_x_policy xpl; 1689 size_t size; 1690 uint16_t ext_msg_len = 0; 1691 int error; 1692 struct mbuf *m; 1693 1694 if (sp == NULL) 1695 return 0; 1696 1697 memset(&msg, 0, sizeof(msg)); 1698 memset(&xpl, 0, sizeof(xpl)); 1699 1700 MGETHDR(m, M_WAIT, MT_DATA); 1701 1702 size = if_ipsec_set_sadb_x_policy(&xpl, NULL, 0, 0, sp->id, 0, NULL, NULL); 1703 ext_msg_len += PFKEY_UNIT64(size); 1704 1705 if_ipsec_set_sadb_msg_del(&msg, ext_msg_len); 1706 1707 m->m_len = sizeof(msg); 1708 m_copyback(m, 0, sizeof(msg), &msg); 1709 1710 if_ipsec_add_mbuf(m, &xpl, sizeof(xpl)); 1711 1712 /* unreference correspond to key_kpi_spdadd(). */ 1713 KEY_SP_UNREF(&sp); 1714 error = key_kpi_spddelete2(m); 1715 if (error != 0) { 1716 log(LOG_ERR, "%s: cannot delete SP(ID=%u) (error=%d).\n", 1717 __func__, sp->id, error); 1718 } 1719 return error; 1720 } 1721 1722 static void 1723 if_ipsec_del_sp(struct ipsec_variant *var) 1724 { 1725 1726 /* are the SPs shared? */ 1727 if (if_ipsec_unshare_sp(var)) 1728 return; 1729 1730 (void)if_ipsec_del_sp0(IV_SP_OUT(var)); 1731 (void)if_ipsec_del_sp0(IV_SP_IN(var)); 1732 (void)if_ipsec_del_sp0(IV_SP_OUT6(var)); 1733 (void)if_ipsec_del_sp0(IV_SP_IN6(var)); 1734 IV_SP_IN(var) = NULL; 1735 IV_SP_IN6(var) = NULL; 1736 IV_SP_OUT(var) = NULL; 1737 IV_SP_OUT6(var) = NULL; 1738 } 1739 1740 static int 1741 if_ipsec_replace_sp(struct ipsec_softc *sc, struct ipsec_variant *ovar, 1742 struct ipsec_variant *nvar) 1743 { 1744 in_port_t src_port = 0; 1745 in_port_t dst_port = 0; 1746 struct sockaddr *src; 1747 struct sockaddr *dst; 1748 int error = 0; 1749 1750 KASSERT(mutex_owned(&sc->ipsec_lock)); 1751 1752 if_ipsec_del_sp(ovar); 1753 1754 src = nvar->iv_psrc; 1755 dst = nvar->iv_pdst; 1756 if (if_ipsec_nat_t(sc)) { 1757 /* NAT-T enabled */ 1758 src_port = nvar->iv_sport; 1759 dst_port = nvar->iv_dport; 1760 } 1761 if (src && dst) 1762 error = if_ipsec_add_sp(nvar, src, src_port, dst, dst_port); 1763 1764 return error; 1765 } 1766 1767 /* 1768 * ipsec_variant and its SPs update API. 1769 * 1770 * Assumption: 1771 * reader side dereferences sc->ipsec_var in reader critical section only, 1772 * that is, all of reader sides do not reader the sc->ipsec_var after 1773 * pserialize_perform(). 1774 */ 1775 static int 1776 if_ipsec_update_variant(struct ipsec_softc *sc, struct ipsec_variant *nvar, 1777 struct ipsec_variant *nullvar) 1778 { 1779 struct ifnet *ifp = &sc->ipsec_if; 1780 struct ipsec_variant *ovar = sc->ipsec_var; 1781 int error; 1782 1783 KASSERT(mutex_owned(&sc->ipsec_lock)); 1784 1785 /* 1786 * To keep consistency between ipsec(4) I/F settings and SPs, 1787 * we stop packet processing while replacing SPs, that is, we set 1788 * "null" config variant to sc->ipsec_var. 1789 */ 1790 sc->ipsec_var = nullvar; 1791 pserialize_perform(sc->ipsec_psz); 1792 psref_target_destroy(&ovar->iv_psref, iv_psref_class); 1793 1794 error = if_ipsec_replace_sp(sc, ovar, nvar); 1795 if (!error) 1796 sc->ipsec_var = nvar; 1797 else { 1798 sc->ipsec_var = ovar; /* rollback */ 1799 psref_target_init(&ovar->iv_psref, iv_psref_class); 1800 } 1801 1802 pserialize_perform(sc->ipsec_psz); 1803 psref_target_destroy(&nullvar->iv_psref, iv_psref_class); 1804 1805 if (if_ipsec_variant_is_configured(sc->ipsec_var)) 1806 ifp->if_flags |= IFF_RUNNING; 1807 else 1808 ifp->if_flags &= ~IFF_RUNNING; 1809 1810 return error; 1811 } 1812
Indexes created Thu Sep 25 16:09:42 GMT 2025