1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 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 * 3. Neither the name of the project nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * $KAME: if_gif.c,v 1.87 2001/10/19 08:50:27 itojun Exp $ 32 */ 33 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD$"); 36 37 #include "opt_inet.h" 38 #include "opt_inet6.h" 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/jail.h> 43 #include <sys/kernel.h> 44 #include <sys/lock.h> 45 #include <sys/malloc.h> 46 #include <sys/mbuf.h> 47 #include <sys/module.h> 48 #include <sys/rmlock.h> 49 #include <sys/socket.h> 50 #include <sys/sockio.h> 51 #include <sys/sx.h> 52 #include <sys/errno.h> 53 #include <sys/time.h> 54 #include <sys/sysctl.h> 55 #include <sys/syslog.h> 56 #include <sys/priv.h> 57 #include <sys/proc.h> 58 #include <sys/protosw.h> 59 #include <sys/conf.h> 60 #include <machine/cpu.h> 61 62 #include <net/if.h> 63 #include <net/if_var.h> 64 #include <net/if_clone.h> 65 #include <net/if_types.h> 66 #include <net/netisr.h> 67 #include <net/route.h> 68 #include <net/bpf.h> 69 #include <net/vnet.h> 70 71 #include <netinet/in.h> 72 #include <netinet/in_systm.h> 73 #include <netinet/ip.h> 74 #include <netinet/ip_ecn.h> 75 #ifdef INET 76 #include <netinet/in_var.h> 77 #include <netinet/ip_var.h> 78 #endif /* INET */ 79 80 #ifdef INET6 81 #ifndef INET 82 #include <netinet/in.h> 83 #endif 84 #include <netinet6/in6_var.h> 85 #include <netinet/ip6.h> 86 #include <netinet6/ip6_ecn.h> 87 #include <netinet6/ip6_var.h> 88 #include <netinet6/scope6_var.h> 89 #include <netinet6/ip6protosw.h> 90 #endif /* INET6 */ 91 92 #include <netinet/ip_encap.h> 93 #include <net/ethernet.h> 94 #include <net/if_bridgevar.h> 95 #include <net/if_gif.h> 96 97 #include <security/mac/mac_framework.h> 98 99 static const char gifname[] = "gif"; 100 101 /* 102 * gif_mtx protects a per-vnet gif_softc_list. 103 */ 104 static VNET_DEFINE(struct mtx, gif_mtx); 105 #define V_gif_mtx VNET(gif_mtx) 106 static MALLOC_DEFINE(M_GIF, "gif", "Generic Tunnel Interface"); 107 static VNET_DEFINE(LIST_HEAD(, gif_softc), gif_softc_list); 108 #define V_gif_softc_list VNET(gif_softc_list) 109 static struct sx gif_ioctl_sx; 110 SX_SYSINIT(gif_ioctl_sx, &gif_ioctl_sx, "gif_ioctl"); 111 112 #define GIF_LIST_LOCK_INIT(x) mtx_init(&V_gif_mtx, "gif_mtx", \ 113 NULL, MTX_DEF) 114 #define GIF_LIST_LOCK_DESTROY(x) mtx_destroy(&V_gif_mtx) 115 #define GIF_LIST_LOCK(x) mtx_lock(&V_gif_mtx) 116 #define GIF_LIST_UNLOCK(x) mtx_unlock(&V_gif_mtx) 117 118 void (*ng_gif_input_p)(struct ifnet *ifp, struct mbuf **mp, int af); 119 void (*ng_gif_input_orphan_p)(struct ifnet *ifp, struct mbuf *m, int af); 120 void (*ng_gif_attach_p)(struct ifnet *ifp); 121 void (*ng_gif_detach_p)(struct ifnet *ifp); 122 123 static int gif_check_nesting(struct ifnet *, struct mbuf *); 124 static int gif_set_tunnel(struct ifnet *, struct sockaddr *, 125 struct sockaddr *); 126 static void gif_delete_tunnel(struct ifnet *); 127 static int gif_ioctl(struct ifnet *, u_long, caddr_t); 128 static int gif_transmit(struct ifnet *, struct mbuf *); 129 static void gif_qflush(struct ifnet *); 130 static int gif_clone_create(struct if_clone *, int, caddr_t); 131 static void gif_clone_destroy(struct ifnet *); 132 static VNET_DEFINE(struct if_clone *, gif_cloner); 133 #define V_gif_cloner VNET(gif_cloner) 134 135 static int gifmodevent(module_t, int, void *); 136 137 SYSCTL_DECL(_net_link); 138 static SYSCTL_NODE(_net_link, IFT_GIF, gif, CTLFLAG_RW, 0, 139 "Generic Tunnel Interface"); 140 #ifndef MAX_GIF_NEST 141 /* 142 * This macro controls the default upper limitation on nesting of gif tunnels. 143 * Since, setting a large value to this macro with a careless configuration 144 * may introduce system crash, we don't allow any nestings by default. 145 * If you need to configure nested gif tunnels, you can define this macro 146 * in your kernel configuration file. However, if you do so, please be 147 * careful to configure the tunnels so that it won't make a loop. 148 */ 149 #define MAX_GIF_NEST 1 150 #endif 151 static VNET_DEFINE(int, max_gif_nesting) = MAX_GIF_NEST; 152 #define V_max_gif_nesting VNET(max_gif_nesting) 153 SYSCTL_INT(_net_link_gif, OID_AUTO, max_nesting, CTLFLAG_VNET | CTLFLAG_RW, 154 &VNET_NAME(max_gif_nesting), 0, "Max nested tunnels"); 155 156 /* 157 * By default, we disallow creation of multiple tunnels between the same 158 * pair of addresses. Some applications require this functionality so 159 * we allow control over this check here. 160 */ 161 #ifdef XBONEHACK 162 static VNET_DEFINE(int, parallel_tunnels) = 1; 163 #else 164 static VNET_DEFINE(int, parallel_tunnels) = 0; 165 #endif 166 #define V_parallel_tunnels VNET(parallel_tunnels) 167 SYSCTL_INT(_net_link_gif, OID_AUTO, parallel_tunnels, 168 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(parallel_tunnels), 0, 169 "Allow parallel tunnels?"); 170 171 static int 172 gif_clone_create(struct if_clone *ifc, int unit, caddr_t params) 173 { 174 struct gif_softc *sc; 175 176 sc = malloc(sizeof(struct gif_softc), M_GIF, M_WAITOK | M_ZERO); 177 sc->gif_fibnum = curthread->td_proc->p_fibnum; 178 GIF2IFP(sc) = if_alloc(IFT_GIF); 179 GIF_LOCK_INIT(sc); 180 GIF2IFP(sc)->if_softc = sc; 181 if_initname(GIF2IFP(sc), gifname, unit); 182 183 GIF2IFP(sc)->if_addrlen = 0; 184 GIF2IFP(sc)->if_mtu = GIF_MTU; 185 GIF2IFP(sc)->if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 186 #if 0 187 /* turn off ingress filter */ 188 GIF2IFP(sc)->if_flags |= IFF_LINK2; 189 #endif 190 GIF2IFP(sc)->if_ioctl = gif_ioctl; 191 GIF2IFP(sc)->if_transmit = gif_transmit; 192 GIF2IFP(sc)->if_qflush = gif_qflush; 193 GIF2IFP(sc)->if_output = gif_output; 194 GIF2IFP(sc)->if_capabilities |= IFCAP_LINKSTATE; 195 GIF2IFP(sc)->if_capenable |= IFCAP_LINKSTATE; 196 if_attach(GIF2IFP(sc)); 197 bpfattach(GIF2IFP(sc), DLT_NULL, sizeof(u_int32_t)); 198 if (ng_gif_attach_p != NULL) 199 (*ng_gif_attach_p)(GIF2IFP(sc)); 200 201 GIF_LIST_LOCK(); 202 LIST_INSERT_HEAD(&V_gif_softc_list, sc, gif_list); 203 GIF_LIST_UNLOCK(); 204 return (0); 205 } 206 207 static void 208 gif_clone_destroy(struct ifnet *ifp) 209 { 210 struct gif_softc *sc; 211 212 sx_xlock(&gif_ioctl_sx); 213 sc = ifp->if_softc; 214 gif_delete_tunnel(ifp); 215 GIF_LIST_LOCK(); 216 LIST_REMOVE(sc, gif_list); 217 GIF_LIST_UNLOCK(); 218 if (ng_gif_detach_p != NULL) 219 (*ng_gif_detach_p)(ifp); 220 bpfdetach(ifp); 221 if_detach(ifp); 222 ifp->if_softc = NULL; 223 sx_xunlock(&gif_ioctl_sx); 224 225 if_free(ifp); 226 GIF_LOCK_DESTROY(sc); 227 free(sc, M_GIF); 228 } 229 230 static void 231 vnet_gif_init(const void *unused __unused) 232 { 233 234 LIST_INIT(&V_gif_softc_list); 235 GIF_LIST_LOCK_INIT(); 236 V_gif_cloner = if_clone_simple(gifname, gif_clone_create, 237 gif_clone_destroy, 0); 238 } 239 VNET_SYSINIT(vnet_gif_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY, 240 vnet_gif_init, NULL); 241 242 static void 243 vnet_gif_uninit(const void *unused __unused) 244 { 245 246 if_clone_detach(V_gif_cloner); 247 GIF_LIST_LOCK_DESTROY(); 248 } 249 VNET_SYSUNINIT(vnet_gif_uninit, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY, 250 vnet_gif_uninit, NULL); 251 252 static int 253 gifmodevent(module_t mod, int type, void *data) 254 { 255 256 switch (type) { 257 case MOD_LOAD: 258 case MOD_UNLOAD: 259 break; 260 default: 261 return (EOPNOTSUPP); 262 } 263 return (0); 264 } 265 266 static moduledata_t gif_mod = { 267 "if_gif", 268 gifmodevent, 269 0 270 }; 271 272 DECLARE_MODULE(if_gif, gif_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 273 MODULE_VERSION(if_gif, 1); 274 275 int 276 gif_encapcheck(const struct mbuf *m, int off, int proto, void *arg) 277 { 278 GIF_RLOCK_TRACKER; 279 const struct ip *ip; 280 struct gif_softc *sc; 281 int ret; 282 283 sc = (struct gif_softc *)arg; 284 if (sc == NULL || (GIF2IFP(sc)->if_flags & IFF_UP) == 0) 285 return (0); 286 287 ret = 0; 288 GIF_RLOCK(sc); 289 290 /* no physical address */ 291 if (sc->gif_family == 0) 292 goto done; 293 294 switch (proto) { 295 #ifdef INET 296 case IPPROTO_IPV4: 297 #endif 298 #ifdef INET6 299 case IPPROTO_IPV6: 300 #endif 301 case IPPROTO_ETHERIP: 302 break; 303 default: 304 goto done; 305 } 306 307 /* Bail on short packets */ 308 M_ASSERTPKTHDR(m); 309 if (m->m_pkthdr.len < sizeof(struct ip)) 310 goto done; 311 312 ip = mtod(m, const struct ip *); 313 switch (ip->ip_v) { 314 #ifdef INET 315 case 4: 316 if (sc->gif_family != AF_INET) 317 goto done; 318 ret = in_gif_encapcheck(m, off, proto, arg); 319 break; 320 #endif 321 #ifdef INET6 322 case 6: 323 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) 324 goto done; 325 if (sc->gif_family != AF_INET6) 326 goto done; 327 ret = in6_gif_encapcheck(m, off, proto, arg); 328 break; 329 #endif 330 } 331 done: 332 GIF_RUNLOCK(sc); 333 return (ret); 334 } 335 336 static int 337 gif_transmit(struct ifnet *ifp, struct mbuf *m) 338 { 339 struct gif_softc *sc; 340 struct etherip_header *eth; 341 #ifdef INET 342 struct ip *ip; 343 #endif 344 #ifdef INET6 345 struct ip6_hdr *ip6; 346 uint32_t t; 347 #endif 348 uint32_t af; 349 uint8_t proto, ecn; 350 int error; 351 352 #ifdef MAC 353 error = mac_ifnet_check_transmit(ifp, m); 354 if (error) { 355 m_freem(m); 356 goto err; 357 } 358 #endif 359 error = ENETDOWN; 360 sc = ifp->if_softc; 361 if ((ifp->if_flags & IFF_MONITOR) != 0 || 362 (ifp->if_flags & IFF_UP) == 0 || 363 sc->gif_family == 0 || 364 (error = gif_check_nesting(ifp, m)) != 0) { 365 m_freem(m); 366 goto err; 367 } 368 /* Now pull back the af that we stashed in the csum_data. */ 369 if (ifp->if_bridge) 370 af = AF_LINK; 371 else 372 af = m->m_pkthdr.csum_data; 373 m->m_flags &= ~(M_BCAST|M_MCAST); 374 M_SETFIB(m, sc->gif_fibnum); 375 BPF_MTAP2(ifp, &af, sizeof(af), m); 376 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); 377 if_inc_counter(ifp, IFCOUNTER_OBYTES, m->m_pkthdr.len); 378 /* inner AF-specific encapsulation */ 379 ecn = 0; 380 switch (af) { 381 #ifdef INET 382 case AF_INET: 383 proto = IPPROTO_IPV4; 384 if (m->m_len < sizeof(struct ip)) 385 m = m_pullup(m, sizeof(struct ip)); 386 if (m == NULL) { 387 error = ENOBUFS; 388 goto err; 389 } 390 ip = mtod(m, struct ip *); 391 ip_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED: 392 ECN_NOCARE, &ecn, &ip->ip_tos); 393 break; 394 #endif 395 #ifdef INET6 396 case AF_INET6: 397 proto = IPPROTO_IPV6; 398 if (m->m_len < sizeof(struct ip6_hdr)) 399 m = m_pullup(m, sizeof(struct ip6_hdr)); 400 if (m == NULL) { 401 error = ENOBUFS; 402 goto err; 403 } 404 t = 0; 405 ip6 = mtod(m, struct ip6_hdr *); 406 ip6_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED: 407 ECN_NOCARE, &t, &ip6->ip6_flow); 408 ecn = (ntohl(t) >> 20) & 0xff; 409 break; 410 #endif 411 case AF_LINK: 412 proto = IPPROTO_ETHERIP; 413 M_PREPEND(m, sizeof(struct etherip_header), M_NOWAIT); 414 if (m == NULL) { 415 error = ENOBUFS; 416 goto err; 417 } 418 eth = mtod(m, struct etherip_header *); 419 eth->eip_resvh = 0; 420 eth->eip_ver = ETHERIP_VERSION; 421 eth->eip_resvl = 0; 422 break; 423 default: 424 error = EAFNOSUPPORT; 425 m_freem(m); 426 goto err; 427 } 428 /* XXX should we check if our outer source is legal? */ 429 /* dispatch to output logic based on outer AF */ 430 switch (sc->gif_family) { 431 #ifdef INET 432 case AF_INET: 433 error = in_gif_output(ifp, m, proto, ecn); 434 break; 435 #endif 436 #ifdef INET6 437 case AF_INET6: 438 error = in6_gif_output(ifp, m, proto, ecn); 439 break; 440 #endif 441 default: 442 m_freem(m); 443 } 444 err: 445 if (error) 446 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 447 return (error); 448 } 449 450 static void 451 gif_qflush(struct ifnet *ifp __unused) 452 { 453 454 } 455 456 #define MTAG_GIF 1080679712 457 static int 458 gif_check_nesting(struct ifnet *ifp, struct mbuf *m) 459 { 460 struct m_tag *mtag; 461 int count; 462 463 /* 464 * gif may cause infinite recursion calls when misconfigured. 465 * We'll prevent this by detecting loops. 466 * 467 * High nesting level may cause stack exhaustion. 468 * We'll prevent this by introducing upper limit. 469 */ 470 count = 1; 471 mtag = NULL; 472 while ((mtag = m_tag_locate(m, MTAG_GIF, 0, mtag)) != NULL) { 473 if (*(struct ifnet **)(mtag + 1) == ifp) { 474 log(LOG_NOTICE, "%s: loop detected\n", if_name(ifp)); 475 return (EIO); 476 } 477 count++; 478 } 479 if (count > V_max_gif_nesting) { 480 log(LOG_NOTICE, 481 "%s: if_output recursively called too many times(%d)\n", 482 if_name(ifp), count); 483 return (EIO); 484 } 485 mtag = m_tag_alloc(MTAG_GIF, 0, sizeof(struct ifnet *), M_NOWAIT); 486 if (mtag == NULL) 487 return (ENOMEM); 488 *(struct ifnet **)(mtag + 1) = ifp; 489 m_tag_prepend(m, mtag); 490 return (0); 491 } 492 493 int 494 gif_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 495 struct route *ro) 496 { 497 uint32_t af; 498 499 if (dst->sa_family == AF_UNSPEC) 500 bcopy(dst->sa_data, &af, sizeof(af)); 501 else 502 af = dst->sa_family; 503 /* 504 * Now save the af in the inbound pkt csum data, this is a cheat since 505 * we are using the inbound csum_data field to carry the af over to 506 * the gif_transmit() routine, avoiding using yet another mtag. 507 */ 508 m->m_pkthdr.csum_data = af; 509 return (ifp->if_transmit(ifp, m)); 510 } 511 512 void 513 gif_input(struct mbuf *m, struct ifnet *ifp, int proto, uint8_t ecn) 514 { 515 struct etherip_header *eip; 516 #ifdef INET 517 struct ip *ip; 518 #endif 519 #ifdef INET6 520 struct ip6_hdr *ip6; 521 uint32_t t; 522 #endif 523 struct ether_header *eh; 524 struct ifnet *oldifp; 525 int isr, n, af; 526 527 if (ifp == NULL) { 528 /* just in case */ 529 m_freem(m); 530 return; 531 } 532 m->m_pkthdr.rcvif = ifp; 533 m_clrprotoflags(m); 534 switch (proto) { 535 #ifdef INET 536 case IPPROTO_IPV4: 537 af = AF_INET; 538 if (m->m_len < sizeof(struct ip)) 539 m = m_pullup(m, sizeof(struct ip)); 540 if (m == NULL) 541 goto drop; 542 ip = mtod(m, struct ip *); 543 if (ip_ecn_egress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED: 544 ECN_NOCARE, &ecn, &ip->ip_tos) == 0) { 545 m_freem(m); 546 goto drop; 547 } 548 break; 549 #endif 550 #ifdef INET6 551 case IPPROTO_IPV6: 552 af = AF_INET6; 553 if (m->m_len < sizeof(struct ip6_hdr)) 554 m = m_pullup(m, sizeof(struct ip6_hdr)); 555 if (m == NULL) 556 goto drop; 557 t = htonl((uint32_t)ecn << 20); 558 ip6 = mtod(m, struct ip6_hdr *); 559 if (ip6_ecn_egress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED: 560 ECN_NOCARE, &t, &ip6->ip6_flow) == 0) { 561 m_freem(m); 562 goto drop; 563 } 564 break; 565 #endif 566 case IPPROTO_ETHERIP: 567 af = AF_LINK; 568 break; 569 default: 570 m_freem(m); 571 goto drop; 572 } 573 574 #ifdef MAC 575 mac_ifnet_create_mbuf(ifp, m); 576 #endif 577 578 if (bpf_peers_present(ifp->if_bpf)) { 579 uint32_t af1 = af; 580 bpf_mtap2(ifp->if_bpf, &af1, sizeof(af1), m); 581 } 582 583 if ((ifp->if_flags & IFF_MONITOR) != 0) { 584 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 585 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 586 m_freem(m); 587 return; 588 } 589 590 if (ng_gif_input_p != NULL) { 591 (*ng_gif_input_p)(ifp, &m, af); 592 if (m == NULL) 593 goto drop; 594 } 595 596 /* 597 * Put the packet to the network layer input queue according to the 598 * specified address family. 599 * Note: older versions of gif_input directly called network layer 600 * input functions, e.g. ip6_input, here. We changed the policy to 601 * prevent too many recursive calls of such input functions, which 602 * might cause kernel panic. But the change may introduce another 603 * problem; if the input queue is full, packets are discarded. 604 * The kernel stack overflow really happened, and we believed 605 * queue-full rarely occurs, so we changed the policy. 606 */ 607 switch (af) { 608 #ifdef INET 609 case AF_INET: 610 isr = NETISR_IP; 611 break; 612 #endif 613 #ifdef INET6 614 case AF_INET6: 615 isr = NETISR_IPV6; 616 break; 617 #endif 618 case AF_LINK: 619 n = sizeof(struct etherip_header) + sizeof(struct ether_header); 620 if (n > m->m_len) 621 m = m_pullup(m, n); 622 if (m == NULL) 623 goto drop; 624 eip = mtod(m, struct etherip_header *); 625 if (eip->eip_ver != ETHERIP_VERSION) { 626 /* discard unknown versions */ 627 m_freem(m); 628 goto drop; 629 } 630 m_adj(m, sizeof(struct etherip_header)); 631 632 m->m_flags &= ~(M_BCAST|M_MCAST); 633 m->m_pkthdr.rcvif = ifp; 634 635 if (ifp->if_bridge) { 636 oldifp = ifp; 637 eh = mtod(m, struct ether_header *); 638 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 639 if (ETHER_IS_BROADCAST(eh->ether_dhost)) 640 m->m_flags |= M_BCAST; 641 else 642 m->m_flags |= M_MCAST; 643 if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1); 644 } 645 BRIDGE_INPUT(ifp, m); 646 647 if (m != NULL && ifp != oldifp) { 648 /* 649 * The bridge gave us back itself or one of the 650 * members for which the frame is addressed. 651 */ 652 ether_demux(ifp, m); 653 return; 654 } 655 } 656 if (m != NULL) 657 m_freem(m); 658 return; 659 660 default: 661 if (ng_gif_input_orphan_p != NULL) 662 (*ng_gif_input_orphan_p)(ifp, m, af); 663 else 664 m_freem(m); 665 return; 666 } 667 668 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 669 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 670 M_SETFIB(m, ifp->if_fib); 671 netisr_dispatch(isr, m); 672 return; 673 drop: 674 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1); 675 } 676 677 /* XXX how should we handle IPv6 scope on SIOC[GS]IFPHYADDR? */ 678 int 679 gif_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 680 { 681 GIF_RLOCK_TRACKER; 682 struct ifreq *ifr = (struct ifreq*)data; 683 struct sockaddr *dst, *src; 684 struct gif_softc *sc; 685 #ifdef INET 686 struct sockaddr_in *sin = NULL; 687 #endif 688 #ifdef INET6 689 struct sockaddr_in6 *sin6 = NULL; 690 #endif 691 u_int options; 692 int error; 693 694 switch (cmd) { 695 case SIOCSIFADDR: 696 ifp->if_flags |= IFF_UP; 697 case SIOCADDMULTI: 698 case SIOCDELMULTI: 699 case SIOCGIFMTU: 700 case SIOCSIFFLAGS: 701 return (0); 702 case SIOCSIFMTU: 703 if (ifr->ifr_mtu < GIF_MTU_MIN || 704 ifr->ifr_mtu > GIF_MTU_MAX) 705 return (EINVAL); 706 else 707 ifp->if_mtu = ifr->ifr_mtu; 708 return (0); 709 } 710 sx_xlock(&gif_ioctl_sx); 711 sc = ifp->if_softc; 712 if (sc == NULL) { 713 error = ENXIO; 714 goto bad; 715 } 716 error = 0; 717 switch (cmd) { 718 case SIOCSIFPHYADDR: 719 #ifdef INET6 720 case SIOCSIFPHYADDR_IN6: 721 #endif 722 error = EINVAL; 723 switch (cmd) { 724 #ifdef INET 725 case SIOCSIFPHYADDR: 726 src = (struct sockaddr *) 727 &(((struct in_aliasreq *)data)->ifra_addr); 728 dst = (struct sockaddr *) 729 &(((struct in_aliasreq *)data)->ifra_dstaddr); 730 break; 731 #endif 732 #ifdef INET6 733 case SIOCSIFPHYADDR_IN6: 734 src = (struct sockaddr *) 735 &(((struct in6_aliasreq *)data)->ifra_addr); 736 dst = (struct sockaddr *) 737 &(((struct in6_aliasreq *)data)->ifra_dstaddr); 738 break; 739 #endif 740 default: 741 goto bad; 742 } 743 /* sa_family must be equal */ 744 if (src->sa_family != dst->sa_family || 745 src->sa_len != dst->sa_len) 746 goto bad; 747 748 /* validate sa_len */ 749 /* check sa_family looks sane for the cmd */ 750 switch (src->sa_family) { 751 #ifdef INET 752 case AF_INET: 753 if (src->sa_len != sizeof(struct sockaddr_in)) 754 goto bad; 755 if (cmd != SIOCSIFPHYADDR) { 756 error = EAFNOSUPPORT; 757 goto bad; 758 } 759 if (satosin(src)->sin_addr.s_addr == INADDR_ANY || 760 satosin(dst)->sin_addr.s_addr == INADDR_ANY) { 761 error = EADDRNOTAVAIL; 762 goto bad; 763 } 764 break; 765 #endif 766 #ifdef INET6 767 case AF_INET6: 768 if (src->sa_len != sizeof(struct sockaddr_in6)) 769 goto bad; 770 if (cmd != SIOCSIFPHYADDR_IN6) { 771 error = EAFNOSUPPORT; 772 goto bad; 773 } 774 error = EADDRNOTAVAIL; 775 if (IN6_IS_ADDR_UNSPECIFIED(&satosin6(src)->sin6_addr) 776 || 777 IN6_IS_ADDR_UNSPECIFIED(&satosin6(dst)->sin6_addr)) 778 goto bad; 779 /* 780 * Check validity of the scope zone ID of the 781 * addresses, and convert it into the kernel 782 * internal form if necessary. 783 */ 784 error = sa6_embedscope(satosin6(src), 0); 785 if (error != 0) 786 goto bad; 787 error = sa6_embedscope(satosin6(dst), 0); 788 if (error != 0) 789 goto bad; 790 break; 791 #endif 792 default: 793 error = EAFNOSUPPORT; 794 goto bad; 795 } 796 error = gif_set_tunnel(ifp, src, dst); 797 break; 798 case SIOCDIFPHYADDR: 799 gif_delete_tunnel(ifp); 800 break; 801 case SIOCGIFPSRCADDR: 802 case SIOCGIFPDSTADDR: 803 #ifdef INET6 804 case SIOCGIFPSRCADDR_IN6: 805 case SIOCGIFPDSTADDR_IN6: 806 #endif 807 if (sc->gif_family == 0) { 808 error = EADDRNOTAVAIL; 809 break; 810 } 811 GIF_RLOCK(sc); 812 switch (cmd) { 813 #ifdef INET 814 case SIOCGIFPSRCADDR: 815 case SIOCGIFPDSTADDR: 816 if (sc->gif_family != AF_INET) { 817 error = EADDRNOTAVAIL; 818 break; 819 } 820 sin = (struct sockaddr_in *)&ifr->ifr_addr; 821 memset(sin, 0, sizeof(*sin)); 822 sin->sin_family = AF_INET; 823 sin->sin_len = sizeof(*sin); 824 break; 825 #endif 826 #ifdef INET6 827 case SIOCGIFPSRCADDR_IN6: 828 case SIOCGIFPDSTADDR_IN6: 829 if (sc->gif_family != AF_INET6) { 830 error = EADDRNOTAVAIL; 831 break; 832 } 833 sin6 = (struct sockaddr_in6 *) 834 &(((struct in6_ifreq *)data)->ifr_addr); 835 memset(sin6, 0, sizeof(*sin6)); 836 sin6->sin6_family = AF_INET6; 837 sin6->sin6_len = sizeof(*sin6); 838 break; 839 #endif 840 default: 841 error = EAFNOSUPPORT; 842 } 843 if (error == 0) { 844 switch (cmd) { 845 #ifdef INET 846 case SIOCGIFPSRCADDR: 847 sin->sin_addr = sc->gif_iphdr->ip_src; 848 break; 849 case SIOCGIFPDSTADDR: 850 sin->sin_addr = sc->gif_iphdr->ip_dst; 851 break; 852 #endif 853 #ifdef INET6 854 case SIOCGIFPSRCADDR_IN6: 855 sin6->sin6_addr = sc->gif_ip6hdr->ip6_src; 856 break; 857 case SIOCGIFPDSTADDR_IN6: 858 sin6->sin6_addr = sc->gif_ip6hdr->ip6_dst; 859 break; 860 #endif 861 } 862 } 863 GIF_RUNLOCK(sc); 864 if (error != 0) 865 break; 866 switch (cmd) { 867 #ifdef INET 868 case SIOCGIFPSRCADDR: 869 case SIOCGIFPDSTADDR: 870 error = prison_if(curthread->td_ucred, 871 (struct sockaddr *)sin); 872 if (error != 0) 873 memset(sin, 0, sizeof(*sin)); 874 break; 875 #endif 876 #ifdef INET6 877 case SIOCGIFPSRCADDR_IN6: 878 case SIOCGIFPDSTADDR_IN6: 879 error = prison_if(curthread->td_ucred, 880 (struct sockaddr *)sin6); 881 if (error == 0) 882 error = sa6_recoverscope(sin6); 883 if (error != 0) 884 memset(sin6, 0, sizeof(*sin6)); 885 #endif 886 } 887 break; 888 case SIOCGTUNFIB: 889 ifr->ifr_fib = sc->gif_fibnum; 890 break; 891 case SIOCSTUNFIB: 892 if ((error = priv_check(curthread, PRIV_NET_GIF)) != 0) 893 break; 894 if (ifr->ifr_fib >= rt_numfibs) 895 error = EINVAL; 896 else 897 sc->gif_fibnum = ifr->ifr_fib; 898 break; 899 case GIFGOPTS: 900 options = sc->gif_options; 901 error = copyout(&options, ifr_data_get_ptr(ifr), 902 sizeof(options)); 903 break; 904 case GIFSOPTS: 905 if ((error = priv_check(curthread, PRIV_NET_GIF)) != 0) 906 break; 907 error = copyin(ifr_data_get_ptr(ifr), &options, 908 sizeof(options)); 909 if (error) 910 break; 911 if (options & ~GIF_OPTMASK) 912 error = EINVAL; 913 else 914 sc->gif_options = options; 915 break; 916 default: 917 error = EINVAL; 918 break; 919 } 920 bad: 921 sx_xunlock(&gif_ioctl_sx); 922 return (error); 923 } 924 925 static void 926 gif_detach(struct gif_softc *sc) 927 { 928 929 sx_assert(&gif_ioctl_sx, SA_XLOCKED); 930 if (sc->gif_ecookie != NULL) 931 encap_detach(sc->gif_ecookie); 932 sc->gif_ecookie = NULL; 933 } 934 935 static int 936 gif_attach(struct gif_softc *sc, int af) 937 { 938 939 sx_assert(&gif_ioctl_sx, SA_XLOCKED); 940 switch (af) { 941 #ifdef INET 942 case AF_INET: 943 return (in_gif_attach(sc)); 944 #endif 945 #ifdef INET6 946 case AF_INET6: 947 return (in6_gif_attach(sc)); 948 #endif 949 } 950 return (EAFNOSUPPORT); 951 } 952 953 static int 954 gif_set_tunnel(struct ifnet *ifp, struct sockaddr *src, struct sockaddr *dst) 955 { 956 struct gif_softc *sc = ifp->if_softc; 957 struct gif_softc *tsc; 958 #ifdef INET 959 struct ip *ip; 960 #endif 961 #ifdef INET6 962 struct ip6_hdr *ip6; 963 #endif 964 void *hdr; 965 int error = 0; 966 967 if (sc == NULL) 968 return (ENXIO); 969 /* Disallow parallel tunnels unless instructed otherwise. */ 970 if (V_parallel_tunnels == 0) { 971 GIF_LIST_LOCK(); 972 LIST_FOREACH(tsc, &V_gif_softc_list, gif_list) { 973 if (tsc == sc || tsc->gif_family != src->sa_family) 974 continue; 975 #ifdef INET 976 if (tsc->gif_family == AF_INET && 977 tsc->gif_iphdr->ip_src.s_addr == 978 satosin(src)->sin_addr.s_addr && 979 tsc->gif_iphdr->ip_dst.s_addr == 980 satosin(dst)->sin_addr.s_addr) { 981 error = EADDRNOTAVAIL; 982 GIF_LIST_UNLOCK(); 983 goto bad; 984 } 985 #endif 986 #ifdef INET6 987 if (tsc->gif_family == AF_INET6 && 988 IN6_ARE_ADDR_EQUAL(&tsc->gif_ip6hdr->ip6_src, 989 &satosin6(src)->sin6_addr) && 990 IN6_ARE_ADDR_EQUAL(&tsc->gif_ip6hdr->ip6_dst, 991 &satosin6(dst)->sin6_addr)) { 992 error = EADDRNOTAVAIL; 993 GIF_LIST_UNLOCK(); 994 goto bad; 995 } 996 #endif 997 } 998 GIF_LIST_UNLOCK(); 999 } 1000 switch (src->sa_family) { 1001 #ifdef INET 1002 case AF_INET: 1003 hdr = ip = malloc(sizeof(struct ip), M_GIF, 1004 M_WAITOK | M_ZERO); 1005 ip->ip_src.s_addr = satosin(src)->sin_addr.s_addr; 1006 ip->ip_dst.s_addr = satosin(dst)->sin_addr.s_addr; 1007 break; 1008 #endif 1009 #ifdef INET6 1010 case AF_INET6: 1011 hdr = ip6 = malloc(sizeof(struct ip6_hdr), M_GIF, 1012 M_WAITOK | M_ZERO); 1013 ip6->ip6_src = satosin6(src)->sin6_addr; 1014 ip6->ip6_dst = satosin6(dst)->sin6_addr; 1015 ip6->ip6_vfc = IPV6_VERSION; 1016 break; 1017 #endif 1018 default: 1019 return (EAFNOSUPPORT); 1020 } 1021 1022 if (sc->gif_family != src->sa_family) 1023 gif_detach(sc); 1024 if (sc->gif_family == 0 || 1025 sc->gif_family != src->sa_family) 1026 error = gif_attach(sc, src->sa_family); 1027 1028 GIF_WLOCK(sc); 1029 if (sc->gif_family != 0) 1030 free(sc->gif_hdr, M_GIF); 1031 sc->gif_family = src->sa_family; 1032 sc->gif_hdr = hdr; 1033 GIF_WUNLOCK(sc); 1034 #if defined(INET) || defined(INET6) 1035 bad: 1036 #endif 1037 if (error == 0 && sc->gif_family != 0) { 1038 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1039 if_link_state_change(ifp, LINK_STATE_UP); 1040 } else { 1041 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1042 if_link_state_change(ifp, LINK_STATE_DOWN); 1043 } 1044 return (error); 1045 } 1046 1047 static void 1048 gif_delete_tunnel(struct ifnet *ifp) 1049 { 1050 struct gif_softc *sc = ifp->if_softc; 1051 int family; 1052 1053 if (sc == NULL) 1054 return; 1055 1056 GIF_WLOCK(sc); 1057 family = sc->gif_family; 1058 sc->gif_family = 0; 1059 GIF_WUNLOCK(sc); 1060 if (family != 0) { 1061 gif_detach(sc); 1062 free(sc->gif_hdr, M_GIF); 1063 } 1064 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1065 if_link_state_change(ifp, LINK_STATE_DOWN); 1066 } 1067