if_gif.c revision 287730
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: stable/10/sys/net/if_gif.c 287730 2015-09-13 01:35:40Z hrs $"); 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 97static const char gifname[] = "gif"; 98 99/* 100 * gif_mtx protects a per-vnet gif_softc_list. 101 */ 102static VNET_DEFINE(struct mtx, gif_mtx); 103#define V_gif_mtx VNET(gif_mtx) 104static MALLOC_DEFINE(M_GIF, "gif", "Generic Tunnel Interface"); 105static VNET_DEFINE(LIST_HEAD(, gif_softc), gif_softc_list); 106#define V_gif_softc_list VNET(gif_softc_list) 107static struct sx gif_ioctl_sx; 108SX_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 116void (*ng_gif_input_p)(struct ifnet *ifp, struct mbuf **mp, int af); 117void (*ng_gif_input_orphan_p)(struct ifnet *ifp, struct mbuf *m, int af); 118void (*ng_gif_attach_p)(struct ifnet *ifp); 119void (*ng_gif_detach_p)(struct ifnet *ifp); 120 121static int gif_check_nesting(struct ifnet *, struct mbuf *); 122static int gif_set_tunnel(struct ifnet *, struct sockaddr *, 123 struct sockaddr *); 124static void gif_delete_tunnel(struct ifnet *); 125static int gif_ioctl(struct ifnet *, u_long, caddr_t); 126static int gif_transmit(struct ifnet *, struct mbuf *); 127static void gif_qflush(struct ifnet *); 128static int gif_clone_create(struct if_clone *, int, caddr_t); 129static void gif_clone_destroy(struct ifnet *); 130static VNET_DEFINE(struct if_clone *, gif_cloner); 131#define V_gif_cloner VNET(gif_cloner) 132 133static int gifmodevent(module_t, int, void *); 134 135SYSCTL_DECL(_net_link); 136static 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 149static VNET_DEFINE(int, max_gif_nesting) = MAX_GIF_NEST; 150#define V_max_gif_nesting VNET(max_gif_nesting) 151SYSCTL_VNET_INT(_net_link_gif, OID_AUTO, max_nesting, 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 160static VNET_DEFINE(int, parallel_tunnels) = 1; 161#else 162static VNET_DEFINE(int, parallel_tunnels) = 0; 163#endif 164#define V_parallel_tunnels VNET(parallel_tunnels) 165SYSCTL_VNET_INT(_net_link_gif, OID_AUTO, parallel_tunnels, CTLFLAG_RW, 166 &VNET_NAME(parallel_tunnels), 0, "Allow parallel tunnels?"); 167 168/* copy from src/sys/net/if_ethersubr.c */ 169static const u_char etherbroadcastaddr[ETHER_ADDR_LEN] = 170 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 171#ifndef ETHER_IS_BROADCAST 172#define ETHER_IS_BROADCAST(addr) \ 173 (bcmp(etherbroadcastaddr, (addr), ETHER_ADDR_LEN) == 0) 174#endif 175 176static int 177gif_clone_create(struct if_clone *ifc, int unit, caddr_t params) 178{ 179 struct gif_softc *sc; 180 181 sc = malloc(sizeof(struct gif_softc), M_GIF, M_WAITOK | M_ZERO); 182 sc->gif_fibnum = curthread->td_proc->p_fibnum; 183 GIF2IFP(sc) = if_alloc(IFT_GIF); 184 GIF_LOCK_INIT(sc); 185 GIF2IFP(sc)->if_softc = sc; 186 if_initname(GIF2IFP(sc), gifname, unit); 187 188 GIF2IFP(sc)->if_addrlen = 0; 189 GIF2IFP(sc)->if_mtu = GIF_MTU; 190 GIF2IFP(sc)->if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 191#if 0 192 /* turn off ingress filter */ 193 GIF2IFP(sc)->if_flags |= IFF_LINK2; 194#endif 195 GIF2IFP(sc)->if_ioctl = gif_ioctl; 196 GIF2IFP(sc)->if_transmit = gif_transmit; 197 GIF2IFP(sc)->if_qflush = gif_qflush; 198 GIF2IFP(sc)->if_output = gif_output; 199 if_attach(GIF2IFP(sc)); 200 bpfattach(GIF2IFP(sc), DLT_NULL, sizeof(u_int32_t)); 201 if (ng_gif_attach_p != NULL) 202 (*ng_gif_attach_p)(GIF2IFP(sc)); 203 204 GIF_LIST_LOCK(); 205 LIST_INSERT_HEAD(&V_gif_softc_list, sc, gif_list); 206 GIF_LIST_UNLOCK(); 207 return (0); 208} 209 210static void 211gif_clone_destroy(struct ifnet *ifp) 212{ 213 struct gif_softc *sc; 214 215 sx_xlock(&gif_ioctl_sx); 216 sc = ifp->if_softc; 217 gif_delete_tunnel(ifp); 218 GIF_LIST_LOCK(); 219 LIST_REMOVE(sc, gif_list); 220 GIF_LIST_UNLOCK(); 221 if (ng_gif_detach_p != NULL) 222 (*ng_gif_detach_p)(ifp); 223 bpfdetach(ifp); 224 if_detach(ifp); 225 ifp->if_softc = NULL; 226 sx_xunlock(&gif_ioctl_sx); 227 228 if_free(ifp); 229 GIF_LOCK_DESTROY(sc); 230 free(sc, M_GIF); 231} 232 233static void 234vnet_gif_init(const void *unused __unused) 235{ 236 237 LIST_INIT(&V_gif_softc_list); 238 GIF_LIST_LOCK_INIT(); 239 V_gif_cloner = if_clone_simple(gifname, gif_clone_create, 240 gif_clone_destroy, 0); 241} 242VNET_SYSINIT(vnet_gif_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY, 243 vnet_gif_init, NULL); 244 245static void 246vnet_gif_uninit(const void *unused __unused) 247{ 248 249 if_clone_detach(V_gif_cloner); 250 GIF_LIST_LOCK_DESTROY(); 251} 252VNET_SYSUNINIT(vnet_gif_uninit, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY, 253 vnet_gif_uninit, NULL); 254 255static int 256gifmodevent(module_t mod, int type, void *data) 257{ 258 259 switch (type) { 260 case MOD_LOAD: 261 case MOD_UNLOAD: 262 break; 263 default: 264 return (EOPNOTSUPP); 265 } 266 return (0); 267} 268 269static moduledata_t gif_mod = { 270 "if_gif", 271 gifmodevent, 272 0 273}; 274 275DECLARE_MODULE(if_gif, gif_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 276MODULE_VERSION(if_gif, 1); 277 278int 279gif_encapcheck(const struct mbuf *m, int off, int proto, void *arg) 280{ 281 GIF_RLOCK_TRACKER; 282 struct gif_softc *sc; 283 int ret; 284 uint8_t ver; 285 286 sc = (struct gif_softc *)arg; 287 if (sc == NULL || (GIF2IFP(sc)->if_flags & IFF_UP) == 0) 288 return (0); 289 290 ret = 0; 291 GIF_RLOCK(sc); 292 293 /* no physical address */ 294 if (sc->gif_family == 0) 295 goto done; 296 297 switch (proto) { 298#ifdef INET 299 case IPPROTO_IPV4: 300#endif 301#ifdef INET6 302 case IPPROTO_IPV6: 303#endif 304 case IPPROTO_ETHERIP: 305 break; 306 default: 307 goto done; 308 } 309 310 /* Bail on short packets */ 311 if (m->m_pkthdr.len < sizeof(struct ip)) 312 goto done; 313 314 m_copydata(m, 0, 1, &ver); 315 switch (ver >> 4) { 316#ifdef INET 317 case 4: 318 if (sc->gif_family != AF_INET) 319 goto done; 320 ret = in_gif_encapcheck(m, off, proto, arg); 321 break; 322#endif 323#ifdef INET6 324 case 6: 325 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) 326 goto done; 327 if (sc->gif_family != AF_INET6) 328 goto done; 329 ret = in6_gif_encapcheck(m, off, proto, arg); 330 break; 331#endif 332 } 333done: 334 GIF_RUNLOCK(sc); 335 return (ret); 336} 337 338static int 339gif_transmit(struct ifnet *ifp, struct mbuf *m) 340{ 341 struct gif_softc *sc; 342 struct etherip_header *eth; 343#ifdef INET 344 struct ip *ip; 345#endif 346#ifdef INET6 347 struct ip6_hdr *ip6; 348 uint32_t t; 349#endif 350 uint32_t af; 351 uint8_t proto, ecn; 352 int error; 353 354#ifdef MAC 355 error = mac_ifnet_check_transmit(ifp, m); 356 if (error) { 357 m_freem(m); 358 goto err; 359 } 360#endif 361 error = ENETDOWN; 362 sc = ifp->if_softc; 363 if ((ifp->if_flags & IFF_MONITOR) != 0 || 364 (ifp->if_flags & IFF_UP) == 0 || 365 sc->gif_family == 0 || 366 (error = gif_check_nesting(ifp, m)) != 0) { 367 m_freem(m); 368 goto err; 369 } 370 /* Now pull back the af that we stashed in the csum_data. */ 371 if (ifp->if_bridge) 372 af = AF_LINK; 373 else 374 af = m->m_pkthdr.csum_data; 375 m->m_flags &= ~(M_BCAST|M_MCAST); 376 M_SETFIB(m, sc->gif_fibnum); 377 BPF_MTAP2(ifp, &af, sizeof(af), m); 378 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); 379 if_inc_counter(ifp, IFCOUNTER_OBYTES, m->m_pkthdr.len); 380 /* inner AF-specific encapsulation */ 381 ecn = 0; 382 switch (af) { 383#ifdef INET 384 case AF_INET: 385 proto = IPPROTO_IPV4; 386 if (m->m_len < sizeof(struct ip)) 387 m = m_pullup(m, sizeof(struct ip)); 388 if (m == NULL) { 389 error = ENOBUFS; 390 goto err; 391 } 392 ip = mtod(m, struct ip *); 393 ip_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED: 394 ECN_NOCARE, &ecn, &ip->ip_tos); 395 break; 396#endif 397#ifdef INET6 398 case AF_INET6: 399 proto = IPPROTO_IPV6; 400 if (m->m_len < sizeof(struct ip6_hdr)) 401 m = m_pullup(m, sizeof(struct ip6_hdr)); 402 if (m == NULL) { 403 error = ENOBUFS; 404 goto err; 405 } 406 t = 0; 407 ip6 = mtod(m, struct ip6_hdr *); 408 ip6_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED: 409 ECN_NOCARE, &t, &ip6->ip6_flow); 410 ecn = (ntohl(t) >> 20) & 0xff; 411 break; 412#endif 413 case AF_LINK: 414 proto = IPPROTO_ETHERIP; 415 M_PREPEND(m, sizeof(struct etherip_header), M_NOWAIT); 416 if (m == NULL) { 417 error = ENOBUFS; 418 goto err; 419 } 420 eth = mtod(m, struct etherip_header *); 421 eth->eip_resvh = 0; 422 eth->eip_ver = ETHERIP_VERSION; 423 eth->eip_resvl = 0; 424 break; 425 default: 426 error = EAFNOSUPPORT; 427 m_freem(m); 428 goto err; 429 } 430 /* XXX should we check if our outer source is legal? */ 431 /* dispatch to output logic based on outer AF */ 432 switch (sc->gif_family) { 433#ifdef INET 434 case AF_INET: 435 error = in_gif_output(ifp, m, proto, ecn); 436 break; 437#endif 438#ifdef INET6 439 case AF_INET6: 440 error = in6_gif_output(ifp, m, proto, ecn); 441 break; 442#endif 443 default: 444 m_freem(m); 445 } 446err: 447 if (error) 448 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 449 return (error); 450} 451 452static void 453gif_qflush(struct ifnet *ifp __unused) 454{ 455 456} 457 458#define MTAG_GIF 1080679712 459static int 460gif_check_nesting(struct ifnet *ifp, struct mbuf *m) 461{ 462 struct m_tag *mtag; 463 int count; 464 465 /* 466 * gif may cause infinite recursion calls when misconfigured. 467 * We'll prevent this by detecting loops. 468 * 469 * High nesting level may cause stack exhaustion. 470 * We'll prevent this by introducing upper limit. 471 */ 472 count = 1; 473 mtag = NULL; 474 while ((mtag = m_tag_locate(m, MTAG_GIF, 0, mtag)) != NULL) { 475 if (*(struct ifnet **)(mtag + 1) == ifp) { 476 log(LOG_NOTICE, "%s: loop detected\n", ifp->if_xname); 477 return (EIO); 478 } 479 count++; 480 } 481 if (count > V_max_gif_nesting) { 482 log(LOG_NOTICE, 483 "%s: if_output recursively called too many times(%d)\n", 484 if_name(ifp), count); 485 return (EIO); 486 } 487 mtag = m_tag_alloc(MTAG_GIF, 0, sizeof(struct ifnet *), M_NOWAIT); 488 if (mtag == NULL) 489 return (ENOMEM); 490 *(struct ifnet **)(mtag + 1) = ifp; 491 m_tag_prepend(m, mtag); 492 return (0); 493} 494 495int 496gif_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 497 struct route *ro) 498{ 499 uint32_t af; 500 501 if (dst->sa_family == AF_UNSPEC) 502 bcopy(dst->sa_data, &af, sizeof(af)); 503 else 504 af = dst->sa_family; 505 /* 506 * Now save the af in the inbound pkt csum data, this is a cheat since 507 * we are using the inbound csum_data field to carry the af over to 508 * the gif_transmit() routine, avoiding using yet another mtag. 509 */ 510 m->m_pkthdr.csum_data = af; 511 return (ifp->if_transmit(ifp, m)); 512} 513 514void 515gif_input(struct mbuf *m, struct ifnet *ifp, int proto, uint8_t ecn) 516{ 517 struct etherip_header *eip; 518#ifdef INET 519 struct ip *ip; 520#endif 521#ifdef INET6 522 struct ip6_hdr *ip6; 523 uint32_t t; 524#endif 525 struct gif_softc *sc; 526 struct ether_header *eh; 527 struct ifnet *oldifp; 528 uint32_t gif_options; 529 int isr, n, af; 530 531 if (ifp == NULL) { 532 /* just in case */ 533 m_freem(m); 534 return; 535 } 536 sc = ifp->if_softc; 537 gif_options = sc->gif_options; 538 m->m_pkthdr.rcvif = ifp; 539 m_clrprotoflags(m); 540 switch (proto) { 541#ifdef INET 542 case IPPROTO_IPV4: 543 af = AF_INET; 544 if (m->m_len < sizeof(struct ip)) 545 m = m_pullup(m, sizeof(struct ip)); 546 if (m == NULL) 547 goto drop; 548 ip = mtod(m, struct ip *); 549 if (ip_ecn_egress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED: 550 ECN_NOCARE, &ecn, &ip->ip_tos) == 0) { 551 m_freem(m); 552 goto drop; 553 } 554 break; 555#endif 556#ifdef INET6 557 case IPPROTO_IPV6: 558 af = AF_INET6; 559 if (m->m_len < sizeof(struct ip6_hdr)) 560 m = m_pullup(m, sizeof(struct ip6_hdr)); 561 if (m == NULL) 562 goto drop; 563 t = htonl((uint32_t)ecn << 20); 564 ip6 = mtod(m, struct ip6_hdr *); 565 if (ip6_ecn_egress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED: 566 ECN_NOCARE, &t, &ip6->ip6_flow) == 0) { 567 m_freem(m); 568 goto drop; 569 } 570 break; 571#endif 572 case IPPROTO_ETHERIP: 573 af = AF_LINK; 574 break; 575 default: 576 m_freem(m); 577 goto drop; 578 } 579 580#ifdef MAC 581 mac_ifnet_create_mbuf(ifp, m); 582#endif 583 584 if (bpf_peers_present(ifp->if_bpf)) { 585 uint32_t af1 = af; 586 bpf_mtap2(ifp->if_bpf, &af1, sizeof(af1), m); 587 } 588 589 if ((ifp->if_flags & IFF_MONITOR) != 0) { 590 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 591 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 592 m_freem(m); 593 return; 594 } 595 596 if (ng_gif_input_p != NULL) { 597 (*ng_gif_input_p)(ifp, &m, af); 598 if (m == NULL) 599 goto drop; 600 } 601 602 /* 603 * Put the packet to the network layer input queue according to the 604 * specified address family. 605 * Note: older versions of gif_input directly called network layer 606 * input functions, e.g. ip6_input, here. We changed the policy to 607 * prevent too many recursive calls of such input functions, which 608 * might cause kernel panic. But the change may introduce another 609 * problem; if the input queue is full, packets are discarded. 610 * The kernel stack overflow really happened, and we believed 611 * queue-full rarely occurs, so we changed the policy. 612 */ 613 switch (af) { 614#ifdef INET 615 case AF_INET: 616 isr = NETISR_IP; 617 break; 618#endif 619#ifdef INET6 620 case AF_INET6: 621 isr = NETISR_IPV6; 622 break; 623#endif 624 case AF_LINK: 625 n = sizeof(struct etherip_header) + sizeof(struct ether_header); 626 if (n > m->m_len) 627 m = m_pullup(m, n); 628 if (m == NULL) 629 goto drop; 630 eip = mtod(m, struct etherip_header *); 631 if (eip->eip_ver != ETHERIP_VERSION) { 632 /* discard unknown versions */ 633 m_freem(m); 634 goto drop; 635 } 636 m_adj(m, sizeof(struct etherip_header)); 637 638 m->m_flags &= ~(M_BCAST|M_MCAST); 639 m->m_pkthdr.rcvif = ifp; 640 641 if (ifp->if_bridge) { 642 oldifp = ifp; 643 eh = mtod(m, struct ether_header *); 644 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 645 if (ETHER_IS_BROADCAST(eh->ether_dhost)) 646 m->m_flags |= M_BCAST; 647 else 648 m->m_flags |= M_MCAST; 649 if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1); 650 } 651 BRIDGE_INPUT(ifp, m); 652 653 if (m != NULL && ifp != oldifp) { 654 /* 655 * The bridge gave us back itself or one of the 656 * members for which the frame is addressed. 657 */ 658 ether_demux(ifp, m); 659 return; 660 } 661 } 662 if (m != NULL) 663 m_freem(m); 664 return; 665 666 default: 667 if (ng_gif_input_orphan_p != NULL) 668 (*ng_gif_input_orphan_p)(ifp, m, af); 669 else 670 m_freem(m); 671 return; 672 } 673 674 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 675 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 676 M_SETFIB(m, ifp->if_fib); 677 netisr_dispatch(isr, m); 678 return; 679drop: 680 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1); 681} 682 683/* XXX how should we handle IPv6 scope on SIOC[GS]IFPHYADDR? */ 684int 685gif_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 686{ 687 GIF_RLOCK_TRACKER; 688 struct ifreq *ifr = (struct ifreq*)data; 689 struct sockaddr *dst, *src; 690 struct gif_softc *sc; 691#ifdef INET 692 struct sockaddr_in *sin = NULL; 693#endif 694#ifdef INET6 695 struct sockaddr_in6 *sin6 = NULL; 696#endif 697 u_int options; 698 int error; 699 700 switch (cmd) { 701 case SIOCSIFADDR: 702 ifp->if_flags |= IFF_UP; 703 case SIOCADDMULTI: 704 case SIOCDELMULTI: 705 case SIOCGIFMTU: 706 case SIOCSIFFLAGS: 707 return (0); 708 case SIOCSIFMTU: 709 if (ifr->ifr_mtu < GIF_MTU_MIN || 710 ifr->ifr_mtu > GIF_MTU_MAX) 711 return (EINVAL); 712 else 713 ifp->if_mtu = ifr->ifr_mtu; 714 return (0); 715 } 716 sx_xlock(&gif_ioctl_sx); 717 sc = ifp->if_softc; 718 if (sc == NULL) { 719 error = ENXIO; 720 goto bad; 721 } 722 error = 0; 723 switch (cmd) { 724 case SIOCSIFPHYADDR: 725#ifdef INET6 726 case SIOCSIFPHYADDR_IN6: 727#endif 728 error = EINVAL; 729 switch (cmd) { 730#ifdef INET 731 case SIOCSIFPHYADDR: 732 src = (struct sockaddr *) 733 &(((struct in_aliasreq *)data)->ifra_addr); 734 dst = (struct sockaddr *) 735 &(((struct in_aliasreq *)data)->ifra_dstaddr); 736 break; 737#endif 738#ifdef INET6 739 case SIOCSIFPHYADDR_IN6: 740 src = (struct sockaddr *) 741 &(((struct in6_aliasreq *)data)->ifra_addr); 742 dst = (struct sockaddr *) 743 &(((struct in6_aliasreq *)data)->ifra_dstaddr); 744 break; 745#endif 746 default: 747 goto bad; 748 } 749 /* sa_family must be equal */ 750 if (src->sa_family != dst->sa_family || 751 src->sa_len != dst->sa_len) 752 goto bad; 753 754 /* validate sa_len */ 755 /* check sa_family looks sane for the cmd */ 756 switch (src->sa_family) { 757#ifdef INET 758 case AF_INET: 759 if (src->sa_len != sizeof(struct sockaddr_in)) 760 goto bad; 761 if (cmd != SIOCSIFPHYADDR) { 762 error = EAFNOSUPPORT; 763 goto bad; 764 } 765 if (satosin(src)->sin_addr.s_addr == INADDR_ANY || 766 satosin(dst)->sin_addr.s_addr == INADDR_ANY) { 767 error = EADDRNOTAVAIL; 768 goto bad; 769 } 770 break; 771#endif 772#ifdef INET6 773 case AF_INET6: 774 if (src->sa_len != sizeof(struct sockaddr_in6)) 775 goto bad; 776 if (cmd != SIOCSIFPHYADDR_IN6) { 777 error = EAFNOSUPPORT; 778 goto bad; 779 } 780 error = EADDRNOTAVAIL; 781 if (IN6_IS_ADDR_UNSPECIFIED(&satosin6(src)->sin6_addr) 782 || 783 IN6_IS_ADDR_UNSPECIFIED(&satosin6(dst)->sin6_addr)) 784 goto bad; 785 /* 786 * Check validity of the scope zone ID of the 787 * addresses, and convert it into the kernel 788 * internal form if necessary. 789 */ 790 error = sa6_embedscope(satosin6(src), 0); 791 if (error != 0) 792 goto bad; 793 error = sa6_embedscope(satosin6(dst), 0); 794 if (error != 0) 795 goto bad; 796 break; 797#endif 798 default: 799 error = EAFNOSUPPORT; 800 goto bad; 801 } 802 error = gif_set_tunnel(ifp, src, dst); 803 break; 804 case SIOCDIFPHYADDR: 805 gif_delete_tunnel(ifp); 806 break; 807 case SIOCGIFPSRCADDR: 808 case SIOCGIFPDSTADDR: 809#ifdef INET6 810 case SIOCGIFPSRCADDR_IN6: 811 case SIOCGIFPDSTADDR_IN6: 812#endif 813 if (sc->gif_family == 0) { 814 error = EADDRNOTAVAIL; 815 break; 816 } 817 GIF_RLOCK(sc); 818 switch (cmd) { 819#ifdef INET 820 case SIOCGIFPSRCADDR: 821 case SIOCGIFPDSTADDR: 822 if (sc->gif_family != AF_INET) { 823 error = EADDRNOTAVAIL; 824 break; 825 } 826 sin = (struct sockaddr_in *)&ifr->ifr_addr; 827 memset(sin, 0, sizeof(*sin)); 828 sin->sin_family = AF_INET; 829 sin->sin_len = sizeof(*sin); 830 break; 831#endif 832#ifdef INET6 833 case SIOCGIFPSRCADDR_IN6: 834 case SIOCGIFPDSTADDR_IN6: 835 if (sc->gif_family != AF_INET6) { 836 error = EADDRNOTAVAIL; 837 break; 838 } 839 sin6 = (struct sockaddr_in6 *) 840 &(((struct in6_ifreq *)data)->ifr_addr); 841 memset(sin6, 0, sizeof(*sin6)); 842 sin6->sin6_family = AF_INET6; 843 sin6->sin6_len = sizeof(*sin6); 844 break; 845#endif 846 default: 847 error = EAFNOSUPPORT; 848 } 849 if (error == 0) { 850 switch (cmd) { 851#ifdef INET 852 case SIOCGIFPSRCADDR: 853 sin->sin_addr = sc->gif_iphdr->ip_src; 854 break; 855 case SIOCGIFPDSTADDR: 856 sin->sin_addr = sc->gif_iphdr->ip_dst; 857 break; 858#endif 859#ifdef INET6 860 case SIOCGIFPSRCADDR_IN6: 861 sin6->sin6_addr = sc->gif_ip6hdr->ip6_src; 862 break; 863 case SIOCGIFPDSTADDR_IN6: 864 sin6->sin6_addr = sc->gif_ip6hdr->ip6_dst; 865 break; 866#endif 867 } 868 } 869 GIF_RUNLOCK(sc); 870 if (error != 0) 871 break; 872 switch (cmd) { 873#ifdef INET 874 case SIOCGIFPSRCADDR: 875 case SIOCGIFPDSTADDR: 876 error = prison_if(curthread->td_ucred, 877 (struct sockaddr *)sin); 878 if (error != 0) 879 memset(sin, 0, sizeof(*sin)); 880 break; 881#endif 882#ifdef INET6 883 case SIOCGIFPSRCADDR_IN6: 884 case SIOCGIFPDSTADDR_IN6: 885 error = prison_if(curthread->td_ucred, 886 (struct sockaddr *)sin6); 887 if (error == 0) 888 error = sa6_recoverscope(sin6); 889 if (error != 0) 890 memset(sin6, 0, sizeof(*sin6)); 891#endif 892 } 893 break; 894 case SIOCGTUNFIB: 895 ifr->ifr_fib = sc->gif_fibnum; 896 break; 897 case SIOCSTUNFIB: 898 if ((error = priv_check(curthread, PRIV_NET_GIF)) != 0) 899 break; 900 if (ifr->ifr_fib >= rt_numfibs) 901 error = EINVAL; 902 else 903 sc->gif_fibnum = ifr->ifr_fib; 904 break; 905 case GIFGOPTS: 906 options = sc->gif_options; 907 error = copyout(&options, ifr->ifr_data, sizeof(options)); 908 break; 909 case GIFSOPTS: 910 if ((error = priv_check(curthread, PRIV_NET_GIF)) != 0) 911 break; 912 error = copyin(ifr->ifr_data, &options, sizeof(options)); 913 if (error) 914 break; 915 if (options & ~GIF_OPTMASK) 916 error = EINVAL; 917 else 918 sc->gif_options = options; 919 break; 920 default: 921 error = EINVAL; 922 break; 923 } 924bad: 925 sx_xunlock(&gif_ioctl_sx); 926 return (error); 927} 928 929static void 930gif_detach(struct gif_softc *sc) 931{ 932 933 sx_assert(&gif_ioctl_sx, SA_XLOCKED); 934 if (sc->gif_ecookie != NULL) 935 encap_detach(sc->gif_ecookie); 936 sc->gif_ecookie = NULL; 937} 938 939static int 940gif_attach(struct gif_softc *sc, int af) 941{ 942 943 sx_assert(&gif_ioctl_sx, SA_XLOCKED); 944 switch (af) { 945#ifdef INET 946 case AF_INET: 947 return (in_gif_attach(sc)); 948#endif 949#ifdef INET6 950 case AF_INET6: 951 return (in6_gif_attach(sc)); 952#endif 953 } 954 return (EAFNOSUPPORT); 955} 956 957static int 958gif_set_tunnel(struct ifnet *ifp, struct sockaddr *src, struct sockaddr *dst) 959{ 960 struct gif_softc *sc = ifp->if_softc; 961 struct gif_softc *tsc; 962#ifdef INET 963 struct ip *ip; 964#endif 965#ifdef INET6 966 struct ip6_hdr *ip6; 967#endif 968 void *hdr; 969 int error = 0; 970 971 if (sc == NULL) 972 return (ENXIO); 973 /* Disallow parallel tunnels unless instructed otherwise. */ 974 if (V_parallel_tunnels == 0) { 975 GIF_LIST_LOCK(); 976 LIST_FOREACH(tsc, &V_gif_softc_list, gif_list) { 977 if (tsc == sc || tsc->gif_family != src->sa_family) 978 continue; 979#ifdef INET 980 if (tsc->gif_family == AF_INET && 981 tsc->gif_iphdr->ip_src.s_addr == 982 satosin(src)->sin_addr.s_addr && 983 tsc->gif_iphdr->ip_dst.s_addr == 984 satosin(dst)->sin_addr.s_addr) { 985 error = EADDRNOTAVAIL; 986 GIF_LIST_UNLOCK(); 987 goto bad; 988 } 989#endif 990#ifdef INET6 991 if (tsc->gif_family == AF_INET6 && 992 IN6_ARE_ADDR_EQUAL(&tsc->gif_ip6hdr->ip6_src, 993 &satosin6(src)->sin6_addr) && 994 IN6_ARE_ADDR_EQUAL(&tsc->gif_ip6hdr->ip6_dst, 995 &satosin6(dst)->sin6_addr)) { 996 error = EADDRNOTAVAIL; 997 GIF_LIST_UNLOCK(); 998 goto bad; 999 } 1000#endif 1001 } 1002 GIF_LIST_UNLOCK(); 1003 } 1004 switch (src->sa_family) { 1005#ifdef INET 1006 case AF_INET: 1007 hdr = ip = malloc(sizeof(struct ip), M_GIF, 1008 M_WAITOK | M_ZERO); 1009 ip->ip_src.s_addr = satosin(src)->sin_addr.s_addr; 1010 ip->ip_dst.s_addr = satosin(dst)->sin_addr.s_addr; 1011 break; 1012#endif 1013#ifdef INET6 1014 case AF_INET6: 1015 hdr = ip6 = malloc(sizeof(struct ip6_hdr), M_GIF, 1016 M_WAITOK | M_ZERO); 1017 ip6->ip6_src = satosin6(src)->sin6_addr; 1018 ip6->ip6_dst = satosin6(dst)->sin6_addr; 1019 ip6->ip6_vfc = IPV6_VERSION; 1020 break; 1021#endif 1022 default: 1023 return (EAFNOSUPPORT); 1024 }; 1025 1026 if (sc->gif_family != src->sa_family) 1027 gif_detach(sc); 1028 if (sc->gif_family == 0 || 1029 sc->gif_family != src->sa_family) 1030 error = gif_attach(sc, src->sa_family); 1031 1032 GIF_WLOCK(sc); 1033 if (sc->gif_family != 0) 1034 free(sc->gif_hdr, M_GIF); 1035 sc->gif_family = src->sa_family; 1036 sc->gif_hdr = hdr; 1037 GIF_WUNLOCK(sc); 1038#if defined(INET) || defined(INET6) 1039bad: 1040#endif 1041 if (error == 0 && sc->gif_family != 0) 1042 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1043 else 1044 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1045 return (error); 1046} 1047 1048static void 1049gif_delete_tunnel(struct ifnet *ifp) 1050{ 1051 struct gif_softc *sc = ifp->if_softc; 1052 int family; 1053 1054 if (sc == NULL) 1055 return; 1056 1057 GIF_WLOCK(sc); 1058 family = sc->gif_family; 1059 sc->gif_family = 0; 1060 GIF_WUNLOCK(sc); 1061 if (family != 0) { 1062 gif_detach(sc); 1063 free(sc->gif_hdr, M_GIF); 1064 } 1065 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1066} 1067