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 if_attach(GIF2IFP(sc)); 201 bpfattach(GIF2IFP(sc), DLT_NULL, sizeof(u_int32_t)); 202 if (ng_gif_attach_p != NULL) 203 (*ng_gif_attach_p)(GIF2IFP(sc)); 204 205 GIF_LIST_LOCK(); 206 LIST_INSERT_HEAD(&V_gif_softc_list, sc, gif_list); 207 GIF_LIST_UNLOCK(); 208 return (0); 209 } 210 211 static void 212 gif_clone_destroy(struct ifnet *ifp) 213 { 214 struct gif_softc *sc; 215 216 sx_xlock(&gif_ioctl_sx); 217 sc = ifp->if_softc; 218 gif_delete_tunnel(ifp); 219 GIF_LIST_LOCK(); 220 LIST_REMOVE(sc, gif_list); 221 GIF_LIST_UNLOCK(); 222 if (ng_gif_detach_p != NULL) 223 (*ng_gif_detach_p)(ifp); 224 bpfdetach(ifp); 225 if_detach(ifp); 226 ifp->if_softc = NULL; 227 sx_xunlock(&gif_ioctl_sx); 228 229 if_free(ifp); 230 GIF_LOCK_DESTROY(sc); 231 free(sc, M_GIF); 232 } 233 234 static void 235 vnet_gif_init(const void *unused __unused) 236 { 237 238 LIST_INIT(&V_gif_softc_list); 239 GIF_LIST_LOCK_INIT(); 240 V_gif_cloner = if_clone_simple(gifname, gif_clone_create, 241 gif_clone_destroy, 0); 242 } 243 VNET_SYSINIT(vnet_gif_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY, 244 vnet_gif_init, NULL); 245 246 static void 247 vnet_gif_uninit(const void *unused __unused) 248 { 249 250 if_clone_detach(V_gif_cloner); 251 GIF_LIST_LOCK_DESTROY(); 252 } 253 VNET_SYSUNINIT(vnet_gif_uninit, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY, 254 vnet_gif_uninit, NULL); 255 256 static int 257 gifmodevent(module_t mod, int type, void *data) 258 { 259 260 switch (type) { 261 case MOD_LOAD: 262 case MOD_UNLOAD: 263 break; 264 default: 265 return (EOPNOTSUPP); 266 } 267 return (0); 268 } 269 270 static moduledata_t gif_mod = { 271 "if_gif", 272 gifmodevent, 273 0 274 }; 275 276 DECLARE_MODULE(if_gif, gif_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 277 MODULE_VERSION(if_gif, 1); 278 279 int 280 gif_encapcheck(const struct mbuf *m, int off, int proto, void *arg) 281 { 282 GIF_RLOCK_TRACKER; 283 struct gif_softc *sc; 284 int ret; 285 uint8_t ver; 286 287 sc = (struct gif_softc *)arg; 288 if (sc == NULL || (GIF2IFP(sc)->if_flags & IFF_UP) == 0) 289 return (0); 290 291 ret = 0; 292 GIF_RLOCK(sc); 293 294 /* no physical address */ 295 if (sc->gif_family == 0) 296 goto done; 297 298 switch (proto) { 299 #ifdef INET 300 case IPPROTO_IPV4: 301 #endif 302 #ifdef INET6 303 case IPPROTO_IPV6: 304 #endif 305 case IPPROTO_ETHERIP: 306 break; 307 default: 308 goto done; 309 } 310 311 /* Bail on short packets */ 312 if (m->m_pkthdr.len < sizeof(struct ip)) 313 goto done; 314 315 m_copydata(m, 0, 1, &ver); 316 switch (ver >> 4) { 317 #ifdef INET 318 case 4: 319 if (sc->gif_family != AF_INET) 320 goto done; 321 ret = in_gif_encapcheck(m, off, proto, arg); 322 break; 323 #endif 324 #ifdef INET6 325 case 6: 326 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) 327 goto done; 328 if (sc->gif_family != AF_INET6) 329 goto done; 330 ret = in6_gif_encapcheck(m, off, proto, arg); 331 break; 332 #endif 333 } 334 done: 335 GIF_RUNLOCK(sc); 336 return (ret); 337 } 338 339 static int 340 gif_transmit(struct ifnet *ifp, struct mbuf *m) 341 { 342 struct gif_softc *sc; 343 struct etherip_header *eth; 344 #ifdef INET 345 struct ip *ip; 346 #endif 347 #ifdef INET6 348 struct ip6_hdr *ip6; 349 uint32_t t; 350 #endif 351 uint32_t af; 352 uint8_t proto, ecn; 353 int error; 354 355 #ifdef MAC 356 error = mac_ifnet_check_transmit(ifp, m); 357 if (error) { 358 m_freem(m); 359 goto err; 360 } 361 #endif 362 error = ENETDOWN; 363 sc = ifp->if_softc; 364 if ((ifp->if_flags & IFF_MONITOR) != 0 || 365 (ifp->if_flags & IFF_UP) == 0 || 366 sc->gif_family == 0 || 367 (error = gif_check_nesting(ifp, m)) != 0) { 368 m_freem(m); 369 goto err; 370 } 371 /* Now pull back the af that we stashed in the csum_data. */ 372 if (ifp->if_bridge) 373 af = AF_LINK; 374 else 375 af = m->m_pkthdr.csum_data; 376 m->m_flags &= ~(M_BCAST|M_MCAST); 377 M_SETFIB(m, sc->gif_fibnum); 378 BPF_MTAP2(ifp, &af, sizeof(af), m); 379 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); 380 if_inc_counter(ifp, IFCOUNTER_OBYTES, m->m_pkthdr.len); 381 /* inner AF-specific encapsulation */ 382 ecn = 0; 383 switch (af) { 384 #ifdef INET 385 case AF_INET: 386 proto = IPPROTO_IPV4; 387 if (m->m_len < sizeof(struct ip)) 388 m = m_pullup(m, sizeof(struct ip)); 389 if (m == NULL) { 390 error = ENOBUFS; 391 goto err; 392 } 393 ip = mtod(m, struct ip *); 394 ip_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED: 395 ECN_NOCARE, &ecn, &ip->ip_tos); 396 break; 397 #endif 398 #ifdef INET6 399 case AF_INET6: 400 proto = IPPROTO_IPV6; 401 if (m->m_len < sizeof(struct ip6_hdr)) 402 m = m_pullup(m, sizeof(struct ip6_hdr)); 403 if (m == NULL) { 404 error = ENOBUFS; 405 goto err; 406 } 407 t = 0; 408 ip6 = mtod(m, struct ip6_hdr *); 409 ip6_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED: 410 ECN_NOCARE, &t, &ip6->ip6_flow); 411 ecn = (ntohl(t) >> 20) & 0xff; 412 break; 413 #endif 414 case AF_LINK: 415 proto = IPPROTO_ETHERIP; 416 M_PREPEND(m, sizeof(struct etherip_header), M_NOWAIT); 417 if (m == NULL) { 418 error = ENOBUFS; 419 goto err; 420 } 421 eth = mtod(m, struct etherip_header *); 422 eth->eip_resvh = 0; 423 if ((sc->gif_options & GIF_SEND_REVETHIP) != 0) { 424 eth->eip_ver = 0; 425 eth->eip_resvl = ETHERIP_VERSION; 426 } else { 427 eth->eip_ver = ETHERIP_VERSION; 428 eth->eip_resvl = 0; 429 } 430 break; 431 default: 432 error = EAFNOSUPPORT; 433 m_freem(m); 434 goto err; 435 } 436 /* XXX should we check if our outer source is legal? */ 437 /* dispatch to output logic based on outer AF */ 438 switch (sc->gif_family) { 439 #ifdef INET 440 case AF_INET: 441 error = in_gif_output(ifp, m, proto, ecn); 442 break; 443 #endif 444 #ifdef INET6 445 case AF_INET6: 446 error = in6_gif_output(ifp, m, proto, ecn); 447 break; 448 #endif 449 default: 450 m_freem(m); 451 } 452 err: 453 if (error) 454 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 455 return (error); 456 } 457 458 static void 459 gif_qflush(struct ifnet *ifp __unused) 460 { 461 462 } 463 464 #define MTAG_GIF 1080679712 465 static int 466 gif_check_nesting(struct ifnet *ifp, struct mbuf *m) 467 { 468 struct m_tag *mtag; 469 int count; 470 471 /* 472 * gif may cause infinite recursion calls when misconfigured. 473 * We'll prevent this by detecting loops. 474 * 475 * High nesting level may cause stack exhaustion. 476 * We'll prevent this by introducing upper limit. 477 */ 478 count = 1; 479 mtag = NULL; 480 while ((mtag = m_tag_locate(m, MTAG_GIF, 0, mtag)) != NULL) { 481 if (*(struct ifnet **)(mtag + 1) == ifp) { 482 log(LOG_NOTICE, "%s: loop detected\n", if_name(ifp)); 483 return (EIO); 484 } 485 count++; 486 } 487 if (count > V_max_gif_nesting) { 488 log(LOG_NOTICE, 489 "%s: if_output recursively called too many times(%d)\n", 490 if_name(ifp), count); 491 return (EIO); 492 } 493 mtag = m_tag_alloc(MTAG_GIF, 0, sizeof(struct ifnet *), M_NOWAIT); 494 if (mtag == NULL) 495 return (ENOMEM); 496 *(struct ifnet **)(mtag + 1) = ifp; 497 m_tag_prepend(m, mtag); 498 return (0); 499 } 500 501 int 502 gif_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 503 struct route *ro) 504 { 505 uint32_t af; 506 507 if (dst->sa_family == AF_UNSPEC) 508 bcopy(dst->sa_data, &af, sizeof(af)); 509 else 510 af = dst->sa_family; 511 /* 512 * Now save the af in the inbound pkt csum data, this is a cheat since 513 * we are using the inbound csum_data field to carry the af over to 514 * the gif_transmit() routine, avoiding using yet another mtag. 515 */ 516 m->m_pkthdr.csum_data = af; 517 return (ifp->if_transmit(ifp, m)); 518 } 519 520 void 521 gif_input(struct mbuf *m, struct ifnet *ifp, int proto, uint8_t ecn) 522 { 523 struct etherip_header *eip; 524 #ifdef INET 525 struct ip *ip; 526 #endif 527 #ifdef INET6 528 struct ip6_hdr *ip6; 529 uint32_t t; 530 #endif 531 struct gif_softc *sc; 532 struct ether_header *eh; 533 struct ifnet *oldifp; 534 uint32_t gif_options; 535 int isr, n, af; 536 537 if (ifp == NULL) { 538 /* just in case */ 539 m_freem(m); 540 return; 541 } 542 sc = ifp->if_softc; 543 gif_options = sc->gif_options; 544 m->m_pkthdr.rcvif = ifp; 545 m_clrprotoflags(m); 546 switch (proto) { 547 #ifdef INET 548 case IPPROTO_IPV4: 549 af = AF_INET; 550 if (m->m_len < sizeof(struct ip)) 551 m = m_pullup(m, sizeof(struct ip)); 552 if (m == NULL) 553 goto drop; 554 ip = mtod(m, struct ip *); 555 if (ip_ecn_egress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED: 556 ECN_NOCARE, &ecn, &ip->ip_tos) == 0) { 557 m_freem(m); 558 goto drop; 559 } 560 break; 561 #endif 562 #ifdef INET6 563 case IPPROTO_IPV6: 564 af = AF_INET6; 565 if (m->m_len < sizeof(struct ip6_hdr)) 566 m = m_pullup(m, sizeof(struct ip6_hdr)); 567 if (m == NULL) 568 goto drop; 569 t = htonl((uint32_t)ecn << 20); 570 ip6 = mtod(m, struct ip6_hdr *); 571 if (ip6_ecn_egress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED: 572 ECN_NOCARE, &t, &ip6->ip6_flow) == 0) { 573 m_freem(m); 574 goto drop; 575 } 576 break; 577 #endif 578 case IPPROTO_ETHERIP: 579 af = AF_LINK; 580 break; 581 default: 582 m_freem(m); 583 goto drop; 584 } 585 586 #ifdef MAC 587 mac_ifnet_create_mbuf(ifp, m); 588 #endif 589 590 if (bpf_peers_present(ifp->if_bpf)) { 591 uint32_t af1 = af; 592 bpf_mtap2(ifp->if_bpf, &af1, sizeof(af1), m); 593 } 594 595 if ((ifp->if_flags & IFF_MONITOR) != 0) { 596 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 597 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 598 m_freem(m); 599 return; 600 } 601 602 if (ng_gif_input_p != NULL) { 603 (*ng_gif_input_p)(ifp, &m, af); 604 if (m == NULL) 605 goto drop; 606 } 607 608 /* 609 * Put the packet to the network layer input queue according to the 610 * specified address family. 611 * Note: older versions of gif_input directly called network layer 612 * input functions, e.g. ip6_input, here. We changed the policy to 613 * prevent too many recursive calls of such input functions, which 614 * might cause kernel panic. But the change may introduce another 615 * problem; if the input queue is full, packets are discarded. 616 * The kernel stack overflow really happened, and we believed 617 * queue-full rarely occurs, so we changed the policy. 618 */ 619 switch (af) { 620 #ifdef INET 621 case AF_INET: 622 isr = NETISR_IP; 623 break; 624 #endif 625 #ifdef INET6 626 case AF_INET6: 627 isr = NETISR_IPV6; 628 break; 629 #endif 630 case AF_LINK: 631 n = sizeof(struct etherip_header) + sizeof(struct ether_header); 632 if (n > m->m_len) 633 m = m_pullup(m, n); 634 if (m == NULL) 635 goto drop; 636 eip = mtod(m, struct etherip_header *); 637 /* 638 * GIF_ACCEPT_REVETHIP (enabled by default) intentionally 639 * accepts an EtherIP packet with revered version field in 640 * the header. This is a knob for backward compatibility 641 * with FreeBSD 7.2R or prior. 642 */ 643 if (eip->eip_ver != ETHERIP_VERSION) { 644 if ((gif_options & GIF_ACCEPT_REVETHIP) == 0 || 645 eip->eip_resvl != ETHERIP_VERSION) { 646 /* discard unknown versions */ 647 m_freem(m); 648 goto drop; 649 } 650 } 651 m_adj(m, sizeof(struct etherip_header)); 652 653 m->m_flags &= ~(M_BCAST|M_MCAST); 654 m->m_pkthdr.rcvif = ifp; 655 656 if (ifp->if_bridge) { 657 oldifp = ifp; 658 eh = mtod(m, struct ether_header *); 659 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 660 if (ETHER_IS_BROADCAST(eh->ether_dhost)) 661 m->m_flags |= M_BCAST; 662 else 663 m->m_flags |= M_MCAST; 664 if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1); 665 } 666 BRIDGE_INPUT(ifp, m); 667 668 if (m != NULL && ifp != oldifp) { 669 /* 670 * The bridge gave us back itself or one of the 671 * members for which the frame is addressed. 672 */ 673 ether_demux(ifp, m); 674 return; 675 } 676 } 677 if (m != NULL) 678 m_freem(m); 679 return; 680 681 default: 682 if (ng_gif_input_orphan_p != NULL) 683 (*ng_gif_input_orphan_p)(ifp, m, af); 684 else 685 m_freem(m); 686 return; 687 } 688 689 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 690 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 691 M_SETFIB(m, ifp->if_fib); 692 netisr_dispatch(isr, m); 693 return; 694 drop: 695 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1); 696 } 697 698 /* XXX how should we handle IPv6 scope on SIOC[GS]IFPHYADDR? */ 699 int 700 gif_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 701 { 702 GIF_RLOCK_TRACKER; 703 struct ifreq *ifr = (struct ifreq*)data; 704 struct sockaddr *dst, *src; 705 struct gif_softc *sc; 706 #ifdef INET 707 struct sockaddr_in *sin = NULL; 708 #endif 709 #ifdef INET6 710 struct sockaddr_in6 *sin6 = NULL; 711 #endif 712 u_int options; 713 int error; 714 715 switch (cmd) { 716 case SIOCSIFADDR: 717 ifp->if_flags |= IFF_UP; 718 case SIOCADDMULTI: 719 case SIOCDELMULTI: 720 case SIOCGIFMTU: 721 case SIOCSIFFLAGS: 722 return (0); 723 case SIOCSIFMTU: 724 if (ifr->ifr_mtu < GIF_MTU_MIN || 725 ifr->ifr_mtu > GIF_MTU_MAX) 726 return (EINVAL); 727 else 728 ifp->if_mtu = ifr->ifr_mtu; 729 return (0); 730 } 731 sx_xlock(&gif_ioctl_sx); 732 sc = ifp->if_softc; 733 if (sc == NULL) { 734 error = ENXIO; 735 goto bad; 736 } 737 error = 0; 738 switch (cmd) { 739 case SIOCSIFPHYADDR: 740 #ifdef INET6 741 case SIOCSIFPHYADDR_IN6: 742 #endif 743 error = EINVAL; 744 switch (cmd) { 745 #ifdef INET 746 case SIOCSIFPHYADDR: 747 src = (struct sockaddr *) 748 &(((struct in_aliasreq *)data)->ifra_addr); 749 dst = (struct sockaddr *) 750 &(((struct in_aliasreq *)data)->ifra_dstaddr); 751 break; 752 #endif 753 #ifdef INET6 754 case SIOCSIFPHYADDR_IN6: 755 src = (struct sockaddr *) 756 &(((struct in6_aliasreq *)data)->ifra_addr); 757 dst = (struct sockaddr *) 758 &(((struct in6_aliasreq *)data)->ifra_dstaddr); 759 break; 760 #endif 761 default: 762 goto bad; 763 } 764 /* sa_family must be equal */ 765 if (src->sa_family != dst->sa_family || 766 src->sa_len != dst->sa_len) 767 goto bad; 768 769 /* validate sa_len */ 770 switch (src->sa_family) { 771 #ifdef INET 772 case AF_INET: 773 if (src->sa_len != sizeof(struct sockaddr_in)) 774 goto bad; 775 break; 776 #endif 777 #ifdef INET6 778 case AF_INET6: 779 if (src->sa_len != sizeof(struct sockaddr_in6)) 780 goto bad; 781 break; 782 #endif 783 default: 784 error = EAFNOSUPPORT; 785 goto bad; 786 } 787 /* check sa_family looks sane for the cmd */ 788 error = EAFNOSUPPORT; 789 switch (cmd) { 790 #ifdef INET 791 case SIOCSIFPHYADDR: 792 if (src->sa_family == AF_INET) 793 break; 794 goto bad; 795 #endif 796 #ifdef INET6 797 case SIOCSIFPHYADDR_IN6: 798 if (src->sa_family == AF_INET6) 799 break; 800 goto bad; 801 #endif 802 } 803 error = EADDRNOTAVAIL; 804 switch (src->sa_family) { 805 #ifdef INET 806 case AF_INET: 807 if (satosin(src)->sin_addr.s_addr == INADDR_ANY || 808 satosin(dst)->sin_addr.s_addr == INADDR_ANY) 809 goto bad; 810 break; 811 #endif 812 #ifdef INET6 813 case AF_INET6: 814 if (IN6_IS_ADDR_UNSPECIFIED(&satosin6(src)->sin6_addr) 815 || 816 IN6_IS_ADDR_UNSPECIFIED(&satosin6(dst)->sin6_addr)) 817 goto bad; 818 /* 819 * Check validity of the scope zone ID of the 820 * addresses, and convert it into the kernel 821 * internal form if necessary. 822 */ 823 error = sa6_embedscope(satosin6(src), 0); 824 if (error != 0) 825 goto bad; 826 error = sa6_embedscope(satosin6(dst), 0); 827 if (error != 0) 828 goto bad; 829 #endif 830 }; 831 error = gif_set_tunnel(ifp, src, dst); 832 break; 833 case SIOCDIFPHYADDR: 834 gif_delete_tunnel(ifp); 835 break; 836 case SIOCGIFPSRCADDR: 837 case SIOCGIFPDSTADDR: 838 #ifdef INET6 839 case SIOCGIFPSRCADDR_IN6: 840 case SIOCGIFPDSTADDR_IN6: 841 #endif 842 if (sc->gif_family == 0) { 843 error = EADDRNOTAVAIL; 844 break; 845 } 846 GIF_RLOCK(sc); 847 switch (cmd) { 848 #ifdef INET 849 case SIOCGIFPSRCADDR: 850 case SIOCGIFPDSTADDR: 851 if (sc->gif_family != AF_INET) { 852 error = EADDRNOTAVAIL; 853 break; 854 } 855 sin = (struct sockaddr_in *)&ifr->ifr_addr; 856 memset(sin, 0, sizeof(*sin)); 857 sin->sin_family = AF_INET; 858 sin->sin_len = sizeof(*sin); 859 break; 860 #endif 861 #ifdef INET6 862 case SIOCGIFPSRCADDR_IN6: 863 case SIOCGIFPDSTADDR_IN6: 864 if (sc->gif_family != AF_INET6) { 865 error = EADDRNOTAVAIL; 866 break; 867 } 868 sin6 = (struct sockaddr_in6 *) 869 &(((struct in6_ifreq *)data)->ifr_addr); 870 memset(sin6, 0, sizeof(*sin6)); 871 sin6->sin6_family = AF_INET6; 872 sin6->sin6_len = sizeof(*sin6); 873 break; 874 #endif 875 default: 876 error = EAFNOSUPPORT; 877 } 878 if (error == 0) { 879 switch (cmd) { 880 #ifdef INET 881 case SIOCGIFPSRCADDR: 882 sin->sin_addr = sc->gif_iphdr->ip_src; 883 break; 884 case SIOCGIFPDSTADDR: 885 sin->sin_addr = sc->gif_iphdr->ip_dst; 886 break; 887 #endif 888 #ifdef INET6 889 case SIOCGIFPSRCADDR_IN6: 890 sin6->sin6_addr = sc->gif_ip6hdr->ip6_src; 891 break; 892 case SIOCGIFPDSTADDR_IN6: 893 sin6->sin6_addr = sc->gif_ip6hdr->ip6_dst; 894 break; 895 #endif 896 } 897 } 898 GIF_RUNLOCK(sc); 899 if (error != 0) 900 break; 901 switch (cmd) { 902 #ifdef INET 903 case SIOCGIFPSRCADDR: 904 case SIOCGIFPDSTADDR: 905 error = prison_if(curthread->td_ucred, 906 (struct sockaddr *)sin); 907 if (error != 0) 908 memset(sin, 0, sizeof(*sin)); 909 break; 910 #endif 911 #ifdef INET6 912 case SIOCGIFPSRCADDR_IN6: 913 case SIOCGIFPDSTADDR_IN6: 914 error = prison_if(curthread->td_ucred, 915 (struct sockaddr *)sin6); 916 if (error == 0) 917 error = sa6_recoverscope(sin6); 918 if (error != 0) 919 memset(sin6, 0, sizeof(*sin6)); 920 #endif 921 } 922 break; 923 case SIOCGTUNFIB: 924 ifr->ifr_fib = sc->gif_fibnum; 925 break; 926 case SIOCSTUNFIB: 927 if ((error = priv_check(curthread, PRIV_NET_GIF)) != 0) 928 break; 929 if (ifr->ifr_fib >= rt_numfibs) 930 error = EINVAL; 931 else 932 sc->gif_fibnum = ifr->ifr_fib; 933 break; 934 case GIFGOPTS: 935 options = sc->gif_options; 936 error = copyout(&options, ifr->ifr_data, sizeof(options)); 937 break; 938 case GIFSOPTS: 939 if ((error = priv_check(curthread, PRIV_NET_GIF)) != 0) 940 break; 941 error = copyin(ifr->ifr_data, &options, sizeof(options)); 942 if (error) 943 break; 944 if (options & ~GIF_OPTMASK) 945 error = EINVAL; 946 else 947 sc->gif_options = options; 948 break; 949 default: 950 error = EINVAL; 951 break; 952 } 953 bad: 954 sx_xunlock(&gif_ioctl_sx); 955 return (error); 956 } 957 958 static void 959 gif_detach(struct gif_softc *sc) 960 { 961 962 sx_assert(&gif_ioctl_sx, SA_XLOCKED); 963 if (sc->gif_ecookie != NULL) 964 encap_detach(sc->gif_ecookie); 965 sc->gif_ecookie = NULL; 966 } 967 968 static int 969 gif_attach(struct gif_softc *sc, int af) 970 { 971 972 sx_assert(&gif_ioctl_sx, SA_XLOCKED); 973 switch (af) { 974 #ifdef INET 975 case AF_INET: 976 return (in_gif_attach(sc)); 977 #endif 978 #ifdef INET6 979 case AF_INET6: 980 return (in6_gif_attach(sc)); 981 #endif 982 } 983 return (EAFNOSUPPORT); 984 } 985 986 static int 987 gif_set_tunnel(struct ifnet *ifp, struct sockaddr *src, struct sockaddr *dst) 988 { 989 struct gif_softc *sc = ifp->if_softc; 990 struct gif_softc *tsc; 991 #ifdef INET 992 struct ip *ip; 993 #endif 994 #ifdef INET6 995 struct ip6_hdr *ip6; 996 #endif 997 void *hdr; 998 int error = 0; 999 1000 if (sc == NULL) 1001 return (ENXIO); 1002 /* Disallow parallel tunnels unless instructed otherwise. */ 1003 if (V_parallel_tunnels == 0) { 1004 GIF_LIST_LOCK(); 1005 LIST_FOREACH(tsc, &V_gif_softc_list, gif_list) { 1006 if (tsc == sc || tsc->gif_family != src->sa_family) 1007 continue; 1008 #ifdef INET 1009 if (tsc->gif_family == AF_INET && 1010 tsc->gif_iphdr->ip_src.s_addr == 1011 satosin(src)->sin_addr.s_addr && 1012 tsc->gif_iphdr->ip_dst.s_addr == 1013 satosin(dst)->sin_addr.s_addr) { 1014 error = EADDRNOTAVAIL; 1015 GIF_LIST_UNLOCK(); 1016 goto bad; 1017 } 1018 #endif 1019 #ifdef INET6 1020 if (tsc->gif_family == AF_INET6 && 1021 IN6_ARE_ADDR_EQUAL(&tsc->gif_ip6hdr->ip6_src, 1022 &satosin6(src)->sin6_addr) && 1023 IN6_ARE_ADDR_EQUAL(&tsc->gif_ip6hdr->ip6_dst, 1024 &satosin6(dst)->sin6_addr)) { 1025 error = EADDRNOTAVAIL; 1026 GIF_LIST_UNLOCK(); 1027 goto bad; 1028 } 1029 #endif 1030 } 1031 GIF_LIST_UNLOCK(); 1032 } 1033 switch (src->sa_family) { 1034 #ifdef INET 1035 case AF_INET: 1036 hdr = ip = malloc(sizeof(struct ip), M_GIF, 1037 M_WAITOK | M_ZERO); 1038 ip->ip_src.s_addr = satosin(src)->sin_addr.s_addr; 1039 ip->ip_dst.s_addr = satosin(dst)->sin_addr.s_addr; 1040 break; 1041 #endif 1042 #ifdef INET6 1043 case AF_INET6: 1044 hdr = ip6 = malloc(sizeof(struct ip6_hdr), M_GIF, 1045 M_WAITOK | M_ZERO); 1046 ip6->ip6_src = satosin6(src)->sin6_addr; 1047 ip6->ip6_dst = satosin6(dst)->sin6_addr; 1048 ip6->ip6_vfc = IPV6_VERSION; 1049 break; 1050 #endif 1051 default: 1052 return (EAFNOSUPPORT); 1053 }; 1054 1055 if (sc->gif_family != src->sa_family) 1056 gif_detach(sc); 1057 if (sc->gif_family == 0 || 1058 sc->gif_family != src->sa_family) 1059 error = gif_attach(sc, src->sa_family); 1060 1061 GIF_WLOCK(sc); 1062 if (sc->gif_family != 0) 1063 free(sc->gif_hdr, M_GIF); 1064 sc->gif_family = src->sa_family; 1065 sc->gif_hdr = hdr; 1066 GIF_WUNLOCK(sc); 1067 #if defined(INET) || defined(INET6) 1068 bad: 1069 #endif 1070 if (error == 0 && sc->gif_family != 0) 1071 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1072 else 1073 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1074 return (error); 1075 } 1076 1077 static void 1078 gif_delete_tunnel(struct ifnet *ifp) 1079 { 1080 struct gif_softc *sc = ifp->if_softc; 1081 int family; 1082 1083 if (sc == NULL) 1084 return; 1085 1086 GIF_WLOCK(sc); 1087 family = sc->gif_family; 1088 sc->gif_family = 0; 1089 GIF_WUNLOCK(sc); 1090 if (family != 0) { 1091 gif_detach(sc); 1092 free(sc->gif_hdr, M_GIF); 1093 } 1094 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1095 } 1096