1 /*- 2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the project nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $KAME: if_gif.c,v 1.87 2001/10/19 08:50:27 itojun Exp $ 30 */ 31 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD$"); 34 35 #include "opt_inet.h" 36 #include "opt_inet6.h" 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/jail.h> 41 #include <sys/kernel.h> 42 #include <sys/lock.h> 43 #include <sys/malloc.h> 44 #include <sys/mbuf.h> 45 #include <sys/module.h> 46 #include <sys/rmlock.h> 47 #include <sys/socket.h> 48 #include <sys/sockio.h> 49 #include <sys/sx.h> 50 #include <sys/errno.h> 51 #include <sys/time.h> 52 #include <sys/sysctl.h> 53 #include <sys/syslog.h> 54 #include <sys/priv.h> 55 #include <sys/proc.h> 56 #include <sys/protosw.h> 57 #include <sys/conf.h> 58 #include <machine/cpu.h> 59 60 #include <net/if.h> 61 #include <net/if_var.h> 62 #include <net/if_clone.h> 63 #include <net/if_types.h> 64 #include <net/netisr.h> 65 #include <net/route.h> 66 #include <net/bpf.h> 67 #include <net/vnet.h> 68 69 #include <netinet/in.h> 70 #include <netinet/in_systm.h> 71 #include <netinet/ip.h> 72 #include <netinet/ip_ecn.h> 73 #ifdef INET 74 #include <netinet/in_var.h> 75 #include <netinet/ip_var.h> 76 #endif /* INET */ 77 78 #ifdef INET6 79 #ifndef INET 80 #include <netinet/in.h> 81 #endif 82 #include <netinet6/in6_var.h> 83 #include <netinet/ip6.h> 84 #include <netinet6/ip6_ecn.h> 85 #include <netinet6/ip6_var.h> 86 #include <netinet6/scope6_var.h> 87 #include <netinet6/ip6protosw.h> 88 #endif /* INET6 */ 89 90 #include <netinet/ip_encap.h> 91 #include <net/ethernet.h> 92 #include <net/if_bridgevar.h> 93 #include <net/if_gif.h> 94 95 #include <security/mac/mac_framework.h> 96 97 static const char gifname[] = "gif"; 98 99 /* 100 * gif_mtx protects a per-vnet gif_softc_list. 101 */ 102 static VNET_DEFINE(struct mtx, gif_mtx); 103 #define V_gif_mtx VNET(gif_mtx) 104 static MALLOC_DEFINE(M_GIF, "gif", "Generic Tunnel Interface"); 105 static VNET_DEFINE(LIST_HEAD(, gif_softc), gif_softc_list); 106 #define V_gif_softc_list VNET(gif_softc_list) 107 static struct sx gif_ioctl_sx; 108 SX_SYSINIT(gif_ioctl_sx, &gif_ioctl_sx, "gif_ioctl"); 109 110 #define GIF_LIST_LOCK_INIT(x) mtx_init(&V_gif_mtx, "gif_mtx", \ 111 NULL, MTX_DEF) 112 #define GIF_LIST_LOCK_DESTROY(x) mtx_destroy(&V_gif_mtx) 113 #define GIF_LIST_LOCK(x) mtx_lock(&V_gif_mtx) 114 #define GIF_LIST_UNLOCK(x) mtx_unlock(&V_gif_mtx) 115 116 void (*ng_gif_input_p)(struct ifnet *ifp, struct mbuf **mp, int af); 117 void (*ng_gif_input_orphan_p)(struct ifnet *ifp, struct mbuf *m, int af); 118 void (*ng_gif_attach_p)(struct ifnet *ifp); 119 void (*ng_gif_detach_p)(struct ifnet *ifp); 120 121 static int gif_check_nesting(struct ifnet *, struct mbuf *); 122 static int gif_set_tunnel(struct ifnet *, struct sockaddr *, 123 struct sockaddr *); 124 static void gif_delete_tunnel(struct ifnet *); 125 static int gif_ioctl(struct ifnet *, u_long, caddr_t); 126 static int gif_transmit(struct ifnet *, struct mbuf *); 127 static void gif_qflush(struct ifnet *); 128 static int gif_clone_create(struct if_clone *, int, caddr_t); 129 static void gif_clone_destroy(struct ifnet *); 130 static VNET_DEFINE(struct if_clone *, gif_cloner); 131 #define V_gif_cloner VNET(gif_cloner) 132 133 static int gifmodevent(module_t, int, void *); 134 135 SYSCTL_DECL(_net_link); 136 static SYSCTL_NODE(_net_link, IFT_GIF, gif, CTLFLAG_RW, 0, 137 "Generic Tunnel Interface"); 138 #ifndef MAX_GIF_NEST 139 /* 140 * This macro controls the default upper limitation on nesting of gif tunnels. 141 * Since, setting a large value to this macro with a careless configuration 142 * may introduce system crash, we don't allow any nestings by default. 143 * If you need to configure nested gif tunnels, you can define this macro 144 * in your kernel configuration file. However, if you do so, please be 145 * careful to configure the tunnels so that it won't make a loop. 146 */ 147 #define MAX_GIF_NEST 1 148 #endif 149 static VNET_DEFINE(int, max_gif_nesting) = MAX_GIF_NEST; 150 #define V_max_gif_nesting VNET(max_gif_nesting) 151 SYSCTL_INT(_net_link_gif, OID_AUTO, max_nesting, CTLFLAG_VNET | CTLFLAG_RW, 152 &VNET_NAME(max_gif_nesting), 0, "Max nested tunnels"); 153 154 /* 155 * By default, we disallow creation of multiple tunnels between the same 156 * pair of addresses. Some applications require this functionality so 157 * we allow control over this check here. 158 */ 159 #ifdef XBONEHACK 160 static VNET_DEFINE(int, parallel_tunnels) = 1; 161 #else 162 static VNET_DEFINE(int, parallel_tunnels) = 0; 163 #endif 164 #define V_parallel_tunnels VNET(parallel_tunnels) 165 SYSCTL_INT(_net_link_gif, OID_AUTO, parallel_tunnels, 166 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(parallel_tunnels), 0, 167 "Allow parallel tunnels?"); 168 169 /* copy from src/sys/net/if_ethersubr.c */ 170 static const u_char etherbroadcastaddr[ETHER_ADDR_LEN] = 171 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 172 #ifndef ETHER_IS_BROADCAST 173 #define ETHER_IS_BROADCAST(addr) \ 174 (bcmp(etherbroadcastaddr, (addr), ETHER_ADDR_LEN) == 0) 175 #endif 176 177 static int 178 gif_clone_create(struct if_clone *ifc, int unit, caddr_t params) 179 { 180 struct gif_softc *sc; 181 182 sc = malloc(sizeof(struct gif_softc), M_GIF, M_WAITOK | M_ZERO); 183 sc->gif_fibnum = curthread->td_proc->p_fibnum; 184 GIF2IFP(sc) = if_alloc(IFT_GIF); 185 GIF_LOCK_INIT(sc); 186 GIF2IFP(sc)->if_softc = sc; 187 if_initname(GIF2IFP(sc), gifname, unit); 188 189 GIF2IFP(sc)->if_addrlen = 0; 190 GIF2IFP(sc)->if_mtu = GIF_MTU; 191 GIF2IFP(sc)->if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 192 #if 0 193 /* turn off ingress filter */ 194 GIF2IFP(sc)->if_flags |= IFF_LINK2; 195 #endif 196 GIF2IFP(sc)->if_ioctl = gif_ioctl; 197 GIF2IFP(sc)->if_transmit = gif_transmit; 198 GIF2IFP(sc)->if_qflush = gif_qflush; 199 GIF2IFP(sc)->if_output = gif_output; 200 GIF2IFP(sc)->if_capabilities |= IFCAP_LINKSTATE; 201 GIF2IFP(sc)->if_capenable |= IFCAP_LINKSTATE; 202 if_attach(GIF2IFP(sc)); 203 bpfattach(GIF2IFP(sc), DLT_NULL, sizeof(u_int32_t)); 204 if (ng_gif_attach_p != NULL) 205 (*ng_gif_attach_p)(GIF2IFP(sc)); 206 207 GIF_LIST_LOCK(); 208 LIST_INSERT_HEAD(&V_gif_softc_list, sc, gif_list); 209 GIF_LIST_UNLOCK(); 210 return (0); 211 } 212 213 static void 214 gif_clone_destroy(struct ifnet *ifp) 215 { 216 struct gif_softc *sc; 217 218 sx_xlock(&gif_ioctl_sx); 219 sc = ifp->if_softc; 220 gif_delete_tunnel(ifp); 221 GIF_LIST_LOCK(); 222 LIST_REMOVE(sc, gif_list); 223 GIF_LIST_UNLOCK(); 224 if (ng_gif_detach_p != NULL) 225 (*ng_gif_detach_p)(ifp); 226 bpfdetach(ifp); 227 if_detach(ifp); 228 ifp->if_softc = NULL; 229 sx_xunlock(&gif_ioctl_sx); 230 231 if_free(ifp); 232 GIF_LOCK_DESTROY(sc); 233 free(sc, M_GIF); 234 } 235 236 static void 237 vnet_gif_init(const void *unused __unused) 238 { 239 240 LIST_INIT(&V_gif_softc_list); 241 GIF_LIST_LOCK_INIT(); 242 V_gif_cloner = if_clone_simple(gifname, gif_clone_create, 243 gif_clone_destroy, 0); 244 } 245 VNET_SYSINIT(vnet_gif_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY, 246 vnet_gif_init, NULL); 247 248 static void 249 vnet_gif_uninit(const void *unused __unused) 250 { 251 252 if_clone_detach(V_gif_cloner); 253 GIF_LIST_LOCK_DESTROY(); 254 } 255 VNET_SYSUNINIT(vnet_gif_uninit, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY, 256 vnet_gif_uninit, NULL); 257 258 static int 259 gifmodevent(module_t mod, int type, void *data) 260 { 261 262 switch (type) { 263 case MOD_LOAD: 264 case MOD_UNLOAD: 265 break; 266 default: 267 return (EOPNOTSUPP); 268 } 269 return (0); 270 } 271 272 static moduledata_t gif_mod = { 273 "if_gif", 274 gifmodevent, 275 0 276 }; 277 278 DECLARE_MODULE(if_gif, gif_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 279 MODULE_VERSION(if_gif, 1); 280 281 int 282 gif_encapcheck(const struct mbuf *m, int off, int proto, void *arg) 283 { 284 GIF_RLOCK_TRACKER; 285 const struct ip *ip; 286 struct gif_softc *sc; 287 int ret; 288 289 sc = (struct gif_softc *)arg; 290 if (sc == NULL || (GIF2IFP(sc)->if_flags & IFF_UP) == 0) 291 return (0); 292 293 ret = 0; 294 GIF_RLOCK(sc); 295 296 /* no physical address */ 297 if (sc->gif_family == 0) 298 goto done; 299 300 switch (proto) { 301 #ifdef INET 302 case IPPROTO_IPV4: 303 #endif 304 #ifdef INET6 305 case IPPROTO_IPV6: 306 #endif 307 case IPPROTO_ETHERIP: 308 break; 309 default: 310 goto done; 311 } 312 313 /* Bail on short packets */ 314 M_ASSERTPKTHDR(m); 315 if (m->m_pkthdr.len < sizeof(struct ip)) 316 goto done; 317 318 ip = mtod(m, const struct ip *); 319 switch (ip->ip_v) { 320 #ifdef INET 321 case 4: 322 if (sc->gif_family != AF_INET) 323 goto done; 324 ret = in_gif_encapcheck(m, off, proto, arg); 325 break; 326 #endif 327 #ifdef INET6 328 case 6: 329 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) 330 goto done; 331 if (sc->gif_family != AF_INET6) 332 goto done; 333 ret = in6_gif_encapcheck(m, off, proto, arg); 334 break; 335 #endif 336 } 337 done: 338 GIF_RUNLOCK(sc); 339 return (ret); 340 } 341 342 static int 343 gif_transmit(struct ifnet *ifp, struct mbuf *m) 344 { 345 struct gif_softc *sc; 346 struct etherip_header *eth; 347 #ifdef INET 348 struct ip *ip; 349 #endif 350 #ifdef INET6 351 struct ip6_hdr *ip6; 352 uint32_t t; 353 #endif 354 uint32_t af; 355 uint8_t proto, ecn; 356 int error; 357 358 #ifdef MAC 359 error = mac_ifnet_check_transmit(ifp, m); 360 if (error) { 361 m_freem(m); 362 goto err; 363 } 364 #endif 365 error = ENETDOWN; 366 sc = ifp->if_softc; 367 if ((ifp->if_flags & IFF_MONITOR) != 0 || 368 (ifp->if_flags & IFF_UP) == 0 || 369 sc->gif_family == 0 || 370 (error = gif_check_nesting(ifp, m)) != 0) { 371 m_freem(m); 372 goto err; 373 } 374 /* Now pull back the af that we stashed in the csum_data. */ 375 if (ifp->if_bridge) 376 af = AF_LINK; 377 else 378 af = m->m_pkthdr.csum_data; 379 m->m_flags &= ~(M_BCAST|M_MCAST); 380 M_SETFIB(m, sc->gif_fibnum); 381 BPF_MTAP2(ifp, &af, sizeof(af), m); 382 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); 383 if_inc_counter(ifp, IFCOUNTER_OBYTES, m->m_pkthdr.len); 384 /* inner AF-specific encapsulation */ 385 ecn = 0; 386 switch (af) { 387 #ifdef INET 388 case AF_INET: 389 proto = IPPROTO_IPV4; 390 if (m->m_len < sizeof(struct ip)) 391 m = m_pullup(m, sizeof(struct ip)); 392 if (m == NULL) { 393 error = ENOBUFS; 394 goto err; 395 } 396 ip = mtod(m, struct ip *); 397 ip_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED: 398 ECN_NOCARE, &ecn, &ip->ip_tos); 399 break; 400 #endif 401 #ifdef INET6 402 case AF_INET6: 403 proto = IPPROTO_IPV6; 404 if (m->m_len < sizeof(struct ip6_hdr)) 405 m = m_pullup(m, sizeof(struct ip6_hdr)); 406 if (m == NULL) { 407 error = ENOBUFS; 408 goto err; 409 } 410 t = 0; 411 ip6 = mtod(m, struct ip6_hdr *); 412 ip6_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED: 413 ECN_NOCARE, &t, &ip6->ip6_flow); 414 ecn = (ntohl(t) >> 20) & 0xff; 415 break; 416 #endif 417 case AF_LINK: 418 proto = IPPROTO_ETHERIP; 419 M_PREPEND(m, sizeof(struct etherip_header), M_NOWAIT); 420 if (m == NULL) { 421 error = ENOBUFS; 422 goto err; 423 } 424 eth = mtod(m, struct etherip_header *); 425 eth->eip_resvh = 0; 426 eth->eip_ver = ETHERIP_VERSION; 427 eth->eip_resvl = 0; 428 break; 429 default: 430 error = EAFNOSUPPORT; 431 m_freem(m); 432 goto err; 433 } 434 /* XXX should we check if our outer source is legal? */ 435 /* dispatch to output logic based on outer AF */ 436 switch (sc->gif_family) { 437 #ifdef INET 438 case AF_INET: 439 error = in_gif_output(ifp, m, proto, ecn); 440 break; 441 #endif 442 #ifdef INET6 443 case AF_INET6: 444 error = in6_gif_output(ifp, m, proto, ecn); 445 break; 446 #endif 447 default: 448 m_freem(m); 449 } 450 err: 451 if (error) 452 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 453 return (error); 454 } 455 456 static void 457 gif_qflush(struct ifnet *ifp __unused) 458 { 459 460 } 461 462 #define MTAG_GIF 1080679712 463 static int 464 gif_check_nesting(struct ifnet *ifp, struct mbuf *m) 465 { 466 struct m_tag *mtag; 467 int count; 468 469 /* 470 * gif may cause infinite recursion calls when misconfigured. 471 * We'll prevent this by detecting loops. 472 * 473 * High nesting level may cause stack exhaustion. 474 * We'll prevent this by introducing upper limit. 475 */ 476 count = 1; 477 mtag = NULL; 478 while ((mtag = m_tag_locate(m, MTAG_GIF, 0, mtag)) != NULL) { 479 if (*(struct ifnet **)(mtag + 1) == ifp) { 480 log(LOG_NOTICE, "%s: loop detected\n", if_name(ifp)); 481 return (EIO); 482 } 483 count++; 484 } 485 if (count > V_max_gif_nesting) { 486 log(LOG_NOTICE, 487 "%s: if_output recursively called too many times(%d)\n", 488 if_name(ifp), count); 489 return (EIO); 490 } 491 mtag = m_tag_alloc(MTAG_GIF, 0, sizeof(struct ifnet *), M_NOWAIT); 492 if (mtag == NULL) 493 return (ENOMEM); 494 *(struct ifnet **)(mtag + 1) = ifp; 495 m_tag_prepend(m, mtag); 496 return (0); 497 } 498 499 int 500 gif_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 501 struct route *ro) 502 { 503 uint32_t af; 504 505 if (dst->sa_family == AF_UNSPEC) 506 bcopy(dst->sa_data, &af, sizeof(af)); 507 else 508 af = dst->sa_family; 509 /* 510 * Now save the af in the inbound pkt csum data, this is a cheat since 511 * we are using the inbound csum_data field to carry the af over to 512 * the gif_transmit() routine, avoiding using yet another mtag. 513 */ 514 m->m_pkthdr.csum_data = af; 515 return (ifp->if_transmit(ifp, m)); 516 } 517 518 void 519 gif_input(struct mbuf *m, struct ifnet *ifp, int proto, uint8_t ecn) 520 { 521 struct etherip_header *eip; 522 #ifdef INET 523 struct ip *ip; 524 #endif 525 #ifdef INET6 526 struct ip6_hdr *ip6; 527 uint32_t t; 528 #endif 529 struct gif_softc *sc; 530 struct ether_header *eh; 531 struct ifnet *oldifp; 532 uint32_t gif_options; 533 int isr, n, af; 534 535 if (ifp == NULL) { 536 /* just in case */ 537 m_freem(m); 538 return; 539 } 540 sc = ifp->if_softc; 541 gif_options = sc->gif_options; 542 m->m_pkthdr.rcvif = ifp; 543 m_clrprotoflags(m); 544 switch (proto) { 545 #ifdef INET 546 case IPPROTO_IPV4: 547 af = AF_INET; 548 if (m->m_len < sizeof(struct ip)) 549 m = m_pullup(m, sizeof(struct ip)); 550 if (m == NULL) 551 goto drop; 552 ip = mtod(m, struct ip *); 553 if (ip_ecn_egress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED: 554 ECN_NOCARE, &ecn, &ip->ip_tos) == 0) { 555 m_freem(m); 556 goto drop; 557 } 558 break; 559 #endif 560 #ifdef INET6 561 case IPPROTO_IPV6: 562 af = AF_INET6; 563 if (m->m_len < sizeof(struct ip6_hdr)) 564 m = m_pullup(m, sizeof(struct ip6_hdr)); 565 if (m == NULL) 566 goto drop; 567 t = htonl((uint32_t)ecn << 20); 568 ip6 = mtod(m, struct ip6_hdr *); 569 if (ip6_ecn_egress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED: 570 ECN_NOCARE, &t, &ip6->ip6_flow) == 0) { 571 m_freem(m); 572 goto drop; 573 } 574 break; 575 #endif 576 case IPPROTO_ETHERIP: 577 af = AF_LINK; 578 break; 579 default: 580 m_freem(m); 581 goto drop; 582 } 583 584 #ifdef MAC 585 mac_ifnet_create_mbuf(ifp, m); 586 #endif 587 588 if (bpf_peers_present(ifp->if_bpf)) { 589 uint32_t af1 = af; 590 bpf_mtap2(ifp->if_bpf, &af1, sizeof(af1), m); 591 } 592 593 if ((ifp->if_flags & IFF_MONITOR) != 0) { 594 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 595 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 596 m_freem(m); 597 return; 598 } 599 600 if (ng_gif_input_p != NULL) { 601 (*ng_gif_input_p)(ifp, &m, af); 602 if (m == NULL) 603 goto drop; 604 } 605 606 /* 607 * Put the packet to the network layer input queue according to the 608 * specified address family. 609 * Note: older versions of gif_input directly called network layer 610 * input functions, e.g. ip6_input, here. We changed the policy to 611 * prevent too many recursive calls of such input functions, which 612 * might cause kernel panic. But the change may introduce another 613 * problem; if the input queue is full, packets are discarded. 614 * The kernel stack overflow really happened, and we believed 615 * queue-full rarely occurs, so we changed the policy. 616 */ 617 switch (af) { 618 #ifdef INET 619 case AF_INET: 620 isr = NETISR_IP; 621 break; 622 #endif 623 #ifdef INET6 624 case AF_INET6: 625 isr = NETISR_IPV6; 626 break; 627 #endif 628 case AF_LINK: 629 n = sizeof(struct etherip_header) + sizeof(struct ether_header); 630 if (n > m->m_len) 631 m = m_pullup(m, n); 632 if (m == NULL) 633 goto drop; 634 eip = mtod(m, struct etherip_header *); 635 if (eip->eip_ver != ETHERIP_VERSION) { 636 /* discard unknown versions */ 637 m_freem(m); 638 goto drop; 639 } 640 m_adj(m, sizeof(struct etherip_header)); 641 642 m->m_flags &= ~(M_BCAST|M_MCAST); 643 m->m_pkthdr.rcvif = ifp; 644 645 if (ifp->if_bridge) { 646 oldifp = ifp; 647 eh = mtod(m, struct ether_header *); 648 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 649 if (ETHER_IS_BROADCAST(eh->ether_dhost)) 650 m->m_flags |= M_BCAST; 651 else 652 m->m_flags |= M_MCAST; 653 if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1); 654 } 655 BRIDGE_INPUT(ifp, m); 656 657 if (m != NULL && ifp != oldifp) { 658 /* 659 * The bridge gave us back itself or one of the 660 * members for which the frame is addressed. 661 */ 662 ether_demux(ifp, m); 663 return; 664 } 665 } 666 if (m != NULL) 667 m_freem(m); 668 return; 669 670 default: 671 if (ng_gif_input_orphan_p != NULL) 672 (*ng_gif_input_orphan_p)(ifp, m, af); 673 else 674 m_freem(m); 675 return; 676 } 677 678 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 679 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 680 M_SETFIB(m, ifp->if_fib); 681 netisr_dispatch(isr, m); 682 return; 683 drop: 684 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1); 685 } 686 687 /* XXX how should we handle IPv6 scope on SIOC[GS]IFPHYADDR? */ 688 int 689 gif_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 690 { 691 GIF_RLOCK_TRACKER; 692 struct ifreq *ifr = (struct ifreq*)data; 693 struct sockaddr *dst, *src; 694 struct gif_softc *sc; 695 #ifdef INET 696 struct sockaddr_in *sin = NULL; 697 #endif 698 #ifdef INET6 699 struct sockaddr_in6 *sin6 = NULL; 700 #endif 701 u_int options; 702 int error; 703 704 switch (cmd) { 705 case SIOCSIFADDR: 706 ifp->if_flags |= IFF_UP; 707 case SIOCADDMULTI: 708 case SIOCDELMULTI: 709 case SIOCGIFMTU: 710 case SIOCSIFFLAGS: 711 return (0); 712 case SIOCSIFMTU: 713 if (ifr->ifr_mtu < GIF_MTU_MIN || 714 ifr->ifr_mtu > GIF_MTU_MAX) 715 return (EINVAL); 716 else 717 ifp->if_mtu = ifr->ifr_mtu; 718 return (0); 719 } 720 sx_xlock(&gif_ioctl_sx); 721 sc = ifp->if_softc; 722 if (sc == NULL) { 723 error = ENXIO; 724 goto bad; 725 } 726 error = 0; 727 switch (cmd) { 728 case SIOCSIFPHYADDR: 729 #ifdef INET6 730 case SIOCSIFPHYADDR_IN6: 731 #endif 732 error = EINVAL; 733 switch (cmd) { 734 #ifdef INET 735 case SIOCSIFPHYADDR: 736 src = (struct sockaddr *) 737 &(((struct in_aliasreq *)data)->ifra_addr); 738 dst = (struct sockaddr *) 739 &(((struct in_aliasreq *)data)->ifra_dstaddr); 740 break; 741 #endif 742 #ifdef INET6 743 case SIOCSIFPHYADDR_IN6: 744 src = (struct sockaddr *) 745 &(((struct in6_aliasreq *)data)->ifra_addr); 746 dst = (struct sockaddr *) 747 &(((struct in6_aliasreq *)data)->ifra_dstaddr); 748 break; 749 #endif 750 default: 751 goto bad; 752 } 753 /* sa_family must be equal */ 754 if (src->sa_family != dst->sa_family || 755 src->sa_len != dst->sa_len) 756 goto bad; 757 758 /* validate sa_len */ 759 /* check sa_family looks sane for the cmd */ 760 switch (src->sa_family) { 761 #ifdef INET 762 case AF_INET: 763 if (src->sa_len != sizeof(struct sockaddr_in)) 764 goto bad; 765 if (cmd != SIOCSIFPHYADDR) { 766 error = EAFNOSUPPORT; 767 goto bad; 768 } 769 if (satosin(src)->sin_addr.s_addr == INADDR_ANY || 770 satosin(dst)->sin_addr.s_addr == INADDR_ANY) { 771 error = EADDRNOTAVAIL; 772 goto bad; 773 } 774 break; 775 #endif 776 #ifdef INET6 777 case AF_INET6: 778 if (src->sa_len != sizeof(struct sockaddr_in6)) 779 goto bad; 780 if (cmd != SIOCSIFPHYADDR_IN6) { 781 error = EAFNOSUPPORT; 782 goto bad; 783 } 784 error = EADDRNOTAVAIL; 785 if (IN6_IS_ADDR_UNSPECIFIED(&satosin6(src)->sin6_addr) 786 || 787 IN6_IS_ADDR_UNSPECIFIED(&satosin6(dst)->sin6_addr)) 788 goto bad; 789 /* 790 * Check validity of the scope zone ID of the 791 * addresses, and convert it into the kernel 792 * internal form if necessary. 793 */ 794 error = sa6_embedscope(satosin6(src), 0); 795 if (error != 0) 796 goto bad; 797 error = sa6_embedscope(satosin6(dst), 0); 798 if (error != 0) 799 goto bad; 800 break; 801 #endif 802 default: 803 error = EAFNOSUPPORT; 804 goto bad; 805 } 806 error = gif_set_tunnel(ifp, src, dst); 807 break; 808 case SIOCDIFPHYADDR: 809 gif_delete_tunnel(ifp); 810 break; 811 case SIOCGIFPSRCADDR: 812 case SIOCGIFPDSTADDR: 813 #ifdef INET6 814 case SIOCGIFPSRCADDR_IN6: 815 case SIOCGIFPDSTADDR_IN6: 816 #endif 817 if (sc->gif_family == 0) { 818 error = EADDRNOTAVAIL; 819 break; 820 } 821 GIF_RLOCK(sc); 822 switch (cmd) { 823 #ifdef INET 824 case SIOCGIFPSRCADDR: 825 case SIOCGIFPDSTADDR: 826 if (sc->gif_family != AF_INET) { 827 error = EADDRNOTAVAIL; 828 break; 829 } 830 sin = (struct sockaddr_in *)&ifr->ifr_addr; 831 memset(sin, 0, sizeof(*sin)); 832 sin->sin_family = AF_INET; 833 sin->sin_len = sizeof(*sin); 834 break; 835 #endif 836 #ifdef INET6 837 case SIOCGIFPSRCADDR_IN6: 838 case SIOCGIFPDSTADDR_IN6: 839 if (sc->gif_family != AF_INET6) { 840 error = EADDRNOTAVAIL; 841 break; 842 } 843 sin6 = (struct sockaddr_in6 *) 844 &(((struct in6_ifreq *)data)->ifr_addr); 845 memset(sin6, 0, sizeof(*sin6)); 846 sin6->sin6_family = AF_INET6; 847 sin6->sin6_len = sizeof(*sin6); 848 break; 849 #endif 850 default: 851 error = EAFNOSUPPORT; 852 } 853 if (error == 0) { 854 switch (cmd) { 855 #ifdef INET 856 case SIOCGIFPSRCADDR: 857 sin->sin_addr = sc->gif_iphdr->ip_src; 858 break; 859 case SIOCGIFPDSTADDR: 860 sin->sin_addr = sc->gif_iphdr->ip_dst; 861 break; 862 #endif 863 #ifdef INET6 864 case SIOCGIFPSRCADDR_IN6: 865 sin6->sin6_addr = sc->gif_ip6hdr->ip6_src; 866 break; 867 case SIOCGIFPDSTADDR_IN6: 868 sin6->sin6_addr = sc->gif_ip6hdr->ip6_dst; 869 break; 870 #endif 871 } 872 } 873 GIF_RUNLOCK(sc); 874 if (error != 0) 875 break; 876 switch (cmd) { 877 #ifdef INET 878 case SIOCGIFPSRCADDR: 879 case SIOCGIFPDSTADDR: 880 error = prison_if(curthread->td_ucred, 881 (struct sockaddr *)sin); 882 if (error != 0) 883 memset(sin, 0, sizeof(*sin)); 884 break; 885 #endif 886 #ifdef INET6 887 case SIOCGIFPSRCADDR_IN6: 888 case SIOCGIFPDSTADDR_IN6: 889 error = prison_if(curthread->td_ucred, 890 (struct sockaddr *)sin6); 891 if (error == 0) 892 error = sa6_recoverscope(sin6); 893 if (error != 0) 894 memset(sin6, 0, sizeof(*sin6)); 895 #endif 896 } 897 break; 898 case SIOCGTUNFIB: 899 ifr->ifr_fib = sc->gif_fibnum; 900 break; 901 case SIOCSTUNFIB: 902 if ((error = priv_check(curthread, PRIV_NET_GIF)) != 0) 903 break; 904 if (ifr->ifr_fib >= rt_numfibs) 905 error = EINVAL; 906 else 907 sc->gif_fibnum = ifr->ifr_fib; 908 break; 909 case GIFGOPTS: 910 options = sc->gif_options; 911 error = copyout(&options, ifr->ifr_data, sizeof(options)); 912 break; 913 case GIFSOPTS: 914 if ((error = priv_check(curthread, PRIV_NET_GIF)) != 0) 915 break; 916 error = copyin(ifr->ifr_data, &options, sizeof(options)); 917 if (error) 918 break; 919 if (options & ~GIF_OPTMASK) 920 error = EINVAL; 921 else 922 sc->gif_options = options; 923 break; 924 default: 925 error = EINVAL; 926 break; 927 } 928 bad: 929 sx_xunlock(&gif_ioctl_sx); 930 return (error); 931 } 932 933 static void 934 gif_detach(struct gif_softc *sc) 935 { 936 937 sx_assert(&gif_ioctl_sx, SA_XLOCKED); 938 if (sc->gif_ecookie != NULL) 939 encap_detach(sc->gif_ecookie); 940 sc->gif_ecookie = NULL; 941 } 942 943 static int 944 gif_attach(struct gif_softc *sc, int af) 945 { 946 947 sx_assert(&gif_ioctl_sx, SA_XLOCKED); 948 switch (af) { 949 #ifdef INET 950 case AF_INET: 951 return (in_gif_attach(sc)); 952 #endif 953 #ifdef INET6 954 case AF_INET6: 955 return (in6_gif_attach(sc)); 956 #endif 957 } 958 return (EAFNOSUPPORT); 959 } 960 961 static int 962 gif_set_tunnel(struct ifnet *ifp, struct sockaddr *src, struct sockaddr *dst) 963 { 964 struct gif_softc *sc = ifp->if_softc; 965 struct gif_softc *tsc; 966 #ifdef INET 967 struct ip *ip; 968 #endif 969 #ifdef INET6 970 struct ip6_hdr *ip6; 971 #endif 972 void *hdr; 973 int error = 0; 974 975 if (sc == NULL) 976 return (ENXIO); 977 /* Disallow parallel tunnels unless instructed otherwise. */ 978 if (V_parallel_tunnels == 0) { 979 GIF_LIST_LOCK(); 980 LIST_FOREACH(tsc, &V_gif_softc_list, gif_list) { 981 if (tsc == sc || tsc->gif_family != src->sa_family) 982 continue; 983 #ifdef INET 984 if (tsc->gif_family == AF_INET && 985 tsc->gif_iphdr->ip_src.s_addr == 986 satosin(src)->sin_addr.s_addr && 987 tsc->gif_iphdr->ip_dst.s_addr == 988 satosin(dst)->sin_addr.s_addr) { 989 error = EADDRNOTAVAIL; 990 GIF_LIST_UNLOCK(); 991 goto bad; 992 } 993 #endif 994 #ifdef INET6 995 if (tsc->gif_family == AF_INET6 && 996 IN6_ARE_ADDR_EQUAL(&tsc->gif_ip6hdr->ip6_src, 997 &satosin6(src)->sin6_addr) && 998 IN6_ARE_ADDR_EQUAL(&tsc->gif_ip6hdr->ip6_dst, 999 &satosin6(dst)->sin6_addr)) { 1000 error = EADDRNOTAVAIL; 1001 GIF_LIST_UNLOCK(); 1002 goto bad; 1003 } 1004 #endif 1005 } 1006 GIF_LIST_UNLOCK(); 1007 } 1008 switch (src->sa_family) { 1009 #ifdef INET 1010 case AF_INET: 1011 hdr = ip = malloc(sizeof(struct ip), M_GIF, 1012 M_WAITOK | M_ZERO); 1013 ip->ip_src.s_addr = satosin(src)->sin_addr.s_addr; 1014 ip->ip_dst.s_addr = satosin(dst)->sin_addr.s_addr; 1015 break; 1016 #endif 1017 #ifdef INET6 1018 case AF_INET6: 1019 hdr = ip6 = malloc(sizeof(struct ip6_hdr), M_GIF, 1020 M_WAITOK | M_ZERO); 1021 ip6->ip6_src = satosin6(src)->sin6_addr; 1022 ip6->ip6_dst = satosin6(dst)->sin6_addr; 1023 ip6->ip6_vfc = IPV6_VERSION; 1024 break; 1025 #endif 1026 default: 1027 return (EAFNOSUPPORT); 1028 }; 1029 1030 if (sc->gif_family != src->sa_family) 1031 gif_detach(sc); 1032 if (sc->gif_family == 0 || 1033 sc->gif_family != src->sa_family) 1034 error = gif_attach(sc, src->sa_family); 1035 1036 GIF_WLOCK(sc); 1037 if (sc->gif_family != 0) 1038 free(sc->gif_hdr, M_GIF); 1039 sc->gif_family = src->sa_family; 1040 sc->gif_hdr = hdr; 1041 GIF_WUNLOCK(sc); 1042 #if defined(INET) || defined(INET6) 1043 bad: 1044 #endif 1045 if (error == 0 && sc->gif_family != 0) { 1046 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1047 if_link_state_change(ifp, LINK_STATE_UP); 1048 } else { 1049 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1050 if_link_state_change(ifp, LINK_STATE_DOWN); 1051 } 1052 return (error); 1053 } 1054 1055 static void 1056 gif_delete_tunnel(struct ifnet *ifp) 1057 { 1058 struct gif_softc *sc = ifp->if_softc; 1059 int family; 1060 1061 if (sc == NULL) 1062 return; 1063 1064 GIF_WLOCK(sc); 1065 family = sc->gif_family; 1066 sc->gif_family = 0; 1067 GIF_WUNLOCK(sc); 1068 if (family != 0) { 1069 gif_detach(sc); 1070 free(sc->gif_hdr, M_GIF); 1071 } 1072 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1073 if_link_state_change(ifp, LINK_STATE_DOWN); 1074 } 1075