if_gif.c revision 257943
1/* $FreeBSD: head/sys/net/if_gif.c 257943 2013-11-11 05:39:42Z glebius $ */ 2/* $KAME: if_gif.c,v 1.87 2001/10/19 08:50:27 itojun Exp $ */ 3 4/*- 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33#include "opt_inet.h" 34#include "opt_inet6.h" 35 36#include <sys/param.h> 37#include <sys/systm.h> 38#include <sys/jail.h> 39#include <sys/kernel.h> 40#include <sys/malloc.h> 41#include <sys/mbuf.h> 42#include <sys/module.h> 43#include <sys/socket.h> 44#include <sys/sockio.h> 45#include <sys/errno.h> 46#include <sys/time.h> 47#include <sys/sysctl.h> 48#include <sys/syslog.h> 49#include <sys/priv.h> 50#include <sys/proc.h> 51#include <sys/protosw.h> 52#include <sys/conf.h> 53#include <machine/cpu.h> 54 55#include <net/if.h> 56#include <net/if_var.h> 57#include <net/if_clone.h> 58#include <net/if_types.h> 59#include <net/netisr.h> 60#include <net/route.h> 61#include <net/bpf.h> 62#include <net/vnet.h> 63 64#include <netinet/in.h> 65#include <netinet/in_systm.h> 66#include <netinet/ip.h> 67#ifdef INET 68#include <netinet/in_var.h> 69#include <netinet/in_gif.h> 70#include <netinet/ip_var.h> 71#endif /* INET */ 72 73#ifdef INET6 74#ifndef INET 75#include <netinet/in.h> 76#endif 77#include <netinet6/in6_var.h> 78#include <netinet/ip6.h> 79#include <netinet6/ip6_var.h> 80#include <netinet6/scope6_var.h> 81#include <netinet6/in6_gif.h> 82#include <netinet6/ip6protosw.h> 83#endif /* INET6 */ 84 85#include <netinet/ip_encap.h> 86#include <net/ethernet.h> 87#include <net/if_bridgevar.h> 88#include <net/if_gif.h> 89 90#include <security/mac/mac_framework.h> 91 92static const char gifname[] = "gif"; 93 94/* 95 * gif_mtx protects the global gif_softc_list. 96 */ 97static struct mtx gif_mtx; 98static MALLOC_DEFINE(M_GIF, "gif", "Generic Tunnel Interface"); 99static VNET_DEFINE(LIST_HEAD(, gif_softc), gif_softc_list); 100#define V_gif_softc_list VNET(gif_softc_list) 101 102void (*ng_gif_input_p)(struct ifnet *ifp, struct mbuf **mp, int af); 103void (*ng_gif_input_orphan_p)(struct ifnet *ifp, struct mbuf *m, int af); 104void (*ng_gif_attach_p)(struct ifnet *ifp); 105void (*ng_gif_detach_p)(struct ifnet *ifp); 106 107static void gif_start(struct ifnet *); 108static int gif_clone_create(struct if_clone *, int, caddr_t); 109static void gif_clone_destroy(struct ifnet *); 110static struct if_clone *gif_cloner; 111 112static int gifmodevent(module_t, int, void *); 113 114SYSCTL_DECL(_net_link); 115static SYSCTL_NODE(_net_link, IFT_GIF, gif, CTLFLAG_RW, 0, 116 "Generic Tunnel Interface"); 117#ifndef MAX_GIF_NEST 118/* 119 * This macro controls the default upper limitation on nesting of gif tunnels. 120 * Since, setting a large value to this macro with a careless configuration 121 * may introduce system crash, we don't allow any nestings by default. 122 * If you need to configure nested gif tunnels, you can define this macro 123 * in your kernel configuration file. However, if you do so, please be 124 * careful to configure the tunnels so that it won't make a loop. 125 */ 126#define MAX_GIF_NEST 1 127#endif 128static VNET_DEFINE(int, max_gif_nesting) = MAX_GIF_NEST; 129#define V_max_gif_nesting VNET(max_gif_nesting) 130SYSCTL_VNET_INT(_net_link_gif, OID_AUTO, max_nesting, CTLFLAG_RW, 131 &VNET_NAME(max_gif_nesting), 0, "Max nested tunnels"); 132 133/* 134 * By default, we disallow creation of multiple tunnels between the same 135 * pair of addresses. Some applications require this functionality so 136 * we allow control over this check here. 137 */ 138#ifdef XBONEHACK 139static VNET_DEFINE(int, parallel_tunnels) = 1; 140#else 141static VNET_DEFINE(int, parallel_tunnels) = 0; 142#endif 143#define V_parallel_tunnels VNET(parallel_tunnels) 144SYSCTL_VNET_INT(_net_link_gif, OID_AUTO, parallel_tunnels, CTLFLAG_RW, 145 &VNET_NAME(parallel_tunnels), 0, "Allow parallel tunnels?"); 146 147/* copy from src/sys/net/if_ethersubr.c */ 148static const u_char etherbroadcastaddr[ETHER_ADDR_LEN] = 149 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 150#ifndef ETHER_IS_BROADCAST 151#define ETHER_IS_BROADCAST(addr) \ 152 (bcmp(etherbroadcastaddr, (addr), ETHER_ADDR_LEN) == 0) 153#endif 154 155static int 156gif_clone_create(ifc, unit, params) 157 struct if_clone *ifc; 158 int unit; 159 caddr_t params; 160{ 161 struct gif_softc *sc; 162 163 sc = malloc(sizeof(struct gif_softc), M_GIF, M_WAITOK | M_ZERO); 164 sc->gif_fibnum = curthread->td_proc->p_fibnum; 165 GIF2IFP(sc) = if_alloc(IFT_GIF); 166 if (GIF2IFP(sc) == NULL) { 167 free(sc, M_GIF); 168 return (ENOSPC); 169 } 170 171 GIF_LOCK_INIT(sc); 172 173 GIF2IFP(sc)->if_softc = sc; 174 if_initname(GIF2IFP(sc), gifname, unit); 175 176 sc->encap_cookie4 = sc->encap_cookie6 = NULL; 177 sc->gif_options = 0; 178 179 GIF2IFP(sc)->if_addrlen = 0; 180 GIF2IFP(sc)->if_mtu = GIF_MTU; 181 GIF2IFP(sc)->if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 182#if 0 183 /* turn off ingress filter */ 184 GIF2IFP(sc)->if_flags |= IFF_LINK2; 185#endif 186 GIF2IFP(sc)->if_ioctl = gif_ioctl; 187 GIF2IFP(sc)->if_start = gif_start; 188 GIF2IFP(sc)->if_output = gif_output; 189 GIF2IFP(sc)->if_snd.ifq_maxlen = ifqmaxlen; 190 if_attach(GIF2IFP(sc)); 191 bpfattach(GIF2IFP(sc), DLT_NULL, sizeof(u_int32_t)); 192 if (ng_gif_attach_p != NULL) 193 (*ng_gif_attach_p)(GIF2IFP(sc)); 194 195 mtx_lock(&gif_mtx); 196 LIST_INSERT_HEAD(&V_gif_softc_list, sc, gif_list); 197 mtx_unlock(&gif_mtx); 198 199 return (0); 200} 201 202static void 203gif_clone_destroy(ifp) 204 struct ifnet *ifp; 205{ 206#if defined(INET) || defined(INET6) 207 int err; 208#endif 209 struct gif_softc *sc = ifp->if_softc; 210 211 mtx_lock(&gif_mtx); 212 LIST_REMOVE(sc, gif_list); 213 mtx_unlock(&gif_mtx); 214 215 gif_delete_tunnel(ifp); 216#ifdef INET6 217 if (sc->encap_cookie6 != NULL) { 218 err = encap_detach(sc->encap_cookie6); 219 KASSERT(err == 0, ("Unexpected error detaching encap_cookie6")); 220 } 221#endif 222#ifdef INET 223 if (sc->encap_cookie4 != NULL) { 224 err = encap_detach(sc->encap_cookie4); 225 KASSERT(err == 0, ("Unexpected error detaching encap_cookie4")); 226 } 227#endif 228 229 if (ng_gif_detach_p != NULL) 230 (*ng_gif_detach_p)(ifp); 231 bpfdetach(ifp); 232 if_detach(ifp); 233 if_free(ifp); 234 235 GIF_LOCK_DESTROY(sc); 236 237 free(sc, M_GIF); 238} 239 240static void 241vnet_gif_init(const void *unused __unused) 242{ 243 244 LIST_INIT(&V_gif_softc_list); 245} 246VNET_SYSINIT(vnet_gif_init, SI_SUB_PSEUDO, SI_ORDER_MIDDLE, vnet_gif_init, 247 NULL); 248 249static int 250gifmodevent(mod, type, data) 251 module_t mod; 252 int type; 253 void *data; 254{ 255 256 switch (type) { 257 case MOD_LOAD: 258 mtx_init(&gif_mtx, "gif_mtx", NULL, MTX_DEF); 259 gif_cloner = if_clone_simple(gifname, gif_clone_create, 260 gif_clone_destroy, 0); 261 break; 262 263 case MOD_UNLOAD: 264 if_clone_detach(gif_cloner); 265 mtx_destroy(&gif_mtx); 266 break; 267 default: 268 return EOPNOTSUPP; 269 } 270 return 0; 271} 272 273static moduledata_t gif_mod = { 274 "if_gif", 275 gifmodevent, 276 0 277}; 278 279DECLARE_MODULE(if_gif, gif_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 280MODULE_VERSION(if_gif, 1); 281 282int 283gif_encapcheck(m, off, proto, arg) 284 const struct mbuf *m; 285 int off; 286 int proto; 287 void *arg; 288{ 289 struct ip ip; 290 struct gif_softc *sc; 291 292 sc = (struct gif_softc *)arg; 293 if (sc == NULL) 294 return 0; 295 296 if ((GIF2IFP(sc)->if_flags & IFF_UP) == 0) 297 return 0; 298 299 /* no physical address */ 300 if (!sc->gif_psrc || !sc->gif_pdst) 301 return 0; 302 303 switch (proto) { 304#ifdef INET 305 case IPPROTO_IPV4: 306 break; 307#endif 308#ifdef INET6 309 case IPPROTO_IPV6: 310 break; 311#endif 312 case IPPROTO_ETHERIP: 313 break; 314 315 default: 316 return 0; 317 } 318 319 /* Bail on short packets */ 320 if (m->m_pkthdr.len < sizeof(ip)) 321 return 0; 322 323 m_copydata(m, 0, sizeof(ip), (caddr_t)&ip); 324 325 switch (ip.ip_v) { 326#ifdef INET 327 case 4: 328 if (sc->gif_psrc->sa_family != AF_INET || 329 sc->gif_pdst->sa_family != AF_INET) 330 return 0; 331 return gif_encapcheck4(m, off, proto, arg); 332#endif 333#ifdef INET6 334 case 6: 335 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) 336 return 0; 337 if (sc->gif_psrc->sa_family != AF_INET6 || 338 sc->gif_pdst->sa_family != AF_INET6) 339 return 0; 340 return gif_encapcheck6(m, off, proto, arg); 341#endif 342 default: 343 return 0; 344 } 345} 346#ifdef INET 347#define GIF_HDR_LEN (ETHER_HDR_LEN + sizeof (struct ip)) 348#endif 349#ifdef INET6 350#define GIF_HDR_LEN6 (ETHER_HDR_LEN + sizeof (struct ip6_hdr)) 351#endif 352 353static void 354gif_start(struct ifnet *ifp) 355{ 356 struct gif_softc *sc; 357 struct mbuf *m; 358 uint32_t af; 359 int error = 0; 360 361 sc = ifp->if_softc; 362 GIF_LOCK(sc); 363 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 364 while (!IFQ_DRV_IS_EMPTY(&ifp->if_snd)) { 365 366 IFQ_DRV_DEQUEUE(&ifp->if_snd, m); 367 if (m == 0) 368 break; 369 370#ifdef ALTQ 371 /* Take out those altq bytes we add in gif_output */ 372#ifdef INET 373 if (sc->gif_psrc->sa_family == AF_INET) 374 m->m_pkthdr.len -= GIF_HDR_LEN; 375#endif 376#ifdef INET6 377 if (sc->gif_psrc->sa_family == AF_INET6) 378 m->m_pkthdr.len -= GIF_HDR_LEN6; 379#endif 380#endif 381 /* 382 * Now pull back the af that we 383 * stashed in the csum_data. 384 */ 385 af = m->m_pkthdr.csum_data; 386 387 if (ifp->if_bridge) 388 af = AF_LINK; 389 390 BPF_MTAP2(ifp, &af, sizeof(af), m); 391 ifp->if_opackets++; 392 393/* Done by IFQ_HANDOFF */ 394/* ifp->if_obytes += m->m_pkthdr.len;*/ 395 /* override to IPPROTO_ETHERIP for bridged traffic */ 396 397 M_SETFIB(m, sc->gif_fibnum); 398 /* inner AF-specific encapsulation */ 399 /* XXX should we check if our outer source is legal? */ 400 /* dispatch to output logic based on outer AF */ 401 switch (sc->gif_psrc->sa_family) { 402#ifdef INET 403 case AF_INET: 404 error = in_gif_output(ifp, af, m); 405 break; 406#endif 407#ifdef INET6 408 case AF_INET6: 409 error = in6_gif_output(ifp, af, m); 410 break; 411#endif 412 default: 413 m_freem(m); 414 error = ENETDOWN; 415 } 416 if (error) 417 ifp->if_oerrors++; 418 419 } 420 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 421 GIF_UNLOCK(sc); 422 return; 423} 424 425int 426gif_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 427 struct route *ro) 428{ 429 struct gif_softc *sc = ifp->if_softc; 430 struct m_tag *mtag; 431 int error = 0; 432 int gif_called; 433 uint32_t af; 434#ifdef MAC 435 error = mac_ifnet_check_transmit(ifp, m); 436 if (error) { 437 m_freem(m); 438 goto end; 439 } 440#endif 441 if ((ifp->if_flags & IFF_MONITOR) != 0) { 442 error = ENETDOWN; 443 m_freem(m); 444 goto end; 445 } 446 447 /* 448 * gif may cause infinite recursion calls when misconfigured. 449 * We'll prevent this by detecting loops. 450 * 451 * High nesting level may cause stack exhaustion. 452 * We'll prevent this by introducing upper limit. 453 */ 454 gif_called = 1; 455 mtag = m_tag_locate(m, MTAG_GIF, MTAG_GIF_CALLED, NULL); 456 while (mtag != NULL) { 457 if (*(struct ifnet **)(mtag + 1) == ifp) { 458 log(LOG_NOTICE, 459 "gif_output: loop detected on %s\n", 460 (*(struct ifnet **)(mtag + 1))->if_xname); 461 m_freem(m); 462 error = EIO; /* is there better errno? */ 463 goto end; 464 } 465 mtag = m_tag_locate(m, MTAG_GIF, MTAG_GIF_CALLED, mtag); 466 gif_called++; 467 } 468 if (gif_called > V_max_gif_nesting) { 469 log(LOG_NOTICE, 470 "gif_output: recursively called too many times(%d)\n", 471 gif_called); 472 m_freem(m); 473 error = EIO; /* is there better errno? */ 474 goto end; 475 } 476 mtag = m_tag_alloc(MTAG_GIF, MTAG_GIF_CALLED, sizeof(struct ifnet *), 477 M_NOWAIT); 478 if (mtag == NULL) { 479 m_freem(m); 480 error = ENOMEM; 481 goto end; 482 } 483 *(struct ifnet **)(mtag + 1) = ifp; 484 m_tag_prepend(m, mtag); 485 486 m->m_flags &= ~(M_BCAST|M_MCAST); 487 /* BPF writes need to be handled specially. */ 488 if (dst->sa_family == AF_UNSPEC) 489 bcopy(dst->sa_data, &af, sizeof(af)); 490 else 491 af = dst->sa_family; 492 /* 493 * Now save the af in the inbound pkt csum 494 * data, this is a cheat since we are using 495 * the inbound csum_data field to carry the 496 * af over to the gif_start() routine, avoiding 497 * using yet another mtag. 498 */ 499 m->m_pkthdr.csum_data = af; 500 if (!(ifp->if_flags & IFF_UP) || 501 sc->gif_psrc == NULL || sc->gif_pdst == NULL) { 502 m_freem(m); 503 error = ENETDOWN; 504 goto end; 505 } 506#ifdef ALTQ 507 /* 508 * Make altq aware of the bytes we will add 509 * when we actually send it. 510 */ 511#ifdef INET 512 if (sc->gif_psrc->sa_family == AF_INET) 513 m->m_pkthdr.len += GIF_HDR_LEN; 514#endif 515#ifdef INET6 516 if (sc->gif_psrc->sa_family == AF_INET6) 517 m->m_pkthdr.len += GIF_HDR_LEN6; 518#endif 519#endif 520 /* 521 * Queue message on interface, update output statistics if 522 * successful, and start output if interface not yet active. 523 */ 524 IFQ_HANDOFF(ifp, m, error); 525 end: 526 if (error) 527 ifp->if_oerrors++; 528 return (error); 529} 530 531void 532gif_input(m, af, ifp) 533 struct mbuf *m; 534 int af; 535 struct ifnet *ifp; 536{ 537 int isr, n; 538 struct gif_softc *sc; 539 struct etherip_header *eip; 540 struct ether_header *eh; 541 struct ifnet *oldifp; 542 543 if (ifp == NULL) { 544 /* just in case */ 545 m_freem(m); 546 return; 547 } 548 sc = ifp->if_softc; 549 m->m_pkthdr.rcvif = ifp; 550 551#ifdef MAC 552 mac_ifnet_create_mbuf(ifp, m); 553#endif 554 555 if (bpf_peers_present(ifp->if_bpf)) { 556 u_int32_t af1 = af; 557 bpf_mtap2(ifp->if_bpf, &af1, sizeof(af1), m); 558 } 559 560 if ((ifp->if_flags & IFF_MONITOR) != 0) { 561 ifp->if_ipackets++; 562 ifp->if_ibytes += m->m_pkthdr.len; 563 m_freem(m); 564 return; 565 } 566 567 if (ng_gif_input_p != NULL) { 568 (*ng_gif_input_p)(ifp, &m, af); 569 if (m == NULL) 570 return; 571 } 572 573 /* 574 * Put the packet to the network layer input queue according to the 575 * specified address family. 576 * Note: older versions of gif_input directly called network layer 577 * input functions, e.g. ip6_input, here. We changed the policy to 578 * prevent too many recursive calls of such input functions, which 579 * might cause kernel panic. But the change may introduce another 580 * problem; if the input queue is full, packets are discarded. 581 * The kernel stack overflow really happened, and we believed 582 * queue-full rarely occurs, so we changed the policy. 583 */ 584 switch (af) { 585#ifdef INET 586 case AF_INET: 587 isr = NETISR_IP; 588 break; 589#endif 590#ifdef INET6 591 case AF_INET6: 592 isr = NETISR_IPV6; 593 break; 594#endif 595 case AF_LINK: 596 n = sizeof(struct etherip_header) + sizeof(struct ether_header); 597 if (n > m->m_len) { 598 m = m_pullup(m, n); 599 if (m == NULL) { 600 ifp->if_ierrors++; 601 return; 602 } 603 } 604 605 eip = mtod(m, struct etherip_header *); 606 /* 607 * GIF_ACCEPT_REVETHIP (enabled by default) intentionally 608 * accepts an EtherIP packet with revered version field in 609 * the header. This is a knob for backward compatibility 610 * with FreeBSD 7.2R or prior. 611 */ 612 if (sc->gif_options & GIF_ACCEPT_REVETHIP) { 613 if (eip->eip_resvl != ETHERIP_VERSION 614 && eip->eip_ver != ETHERIP_VERSION) { 615 /* discard unknown versions */ 616 m_freem(m); 617 return; 618 } 619 } else { 620 if (eip->eip_ver != ETHERIP_VERSION) { 621 /* discard unknown versions */ 622 m_freem(m); 623 return; 624 } 625 } 626 m_adj(m, sizeof(struct etherip_header)); 627 628 m->m_flags &= ~(M_BCAST|M_MCAST); 629 m->m_pkthdr.rcvif = ifp; 630 631 if (ifp->if_bridge) { 632 oldifp = ifp; 633 eh = mtod(m, struct ether_header *); 634 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 635 if (ETHER_IS_BROADCAST(eh->ether_dhost)) 636 m->m_flags |= M_BCAST; 637 else 638 m->m_flags |= M_MCAST; 639 ifp->if_imcasts++; 640 } 641 BRIDGE_INPUT(ifp, m); 642 643 if (m != NULL && ifp != oldifp) { 644 /* 645 * The bridge gave us back itself or one of the 646 * members for which the frame is addressed. 647 */ 648 ether_demux(ifp, m); 649 return; 650 } 651 } 652 if (m != NULL) 653 m_freem(m); 654 return; 655 656 default: 657 if (ng_gif_input_orphan_p != NULL) 658 (*ng_gif_input_orphan_p)(ifp, m, af); 659 else 660 m_freem(m); 661 return; 662 } 663 664 ifp->if_ipackets++; 665 ifp->if_ibytes += m->m_pkthdr.len; 666 M_SETFIB(m, ifp->if_fib); 667 netisr_dispatch(isr, m); 668} 669 670/* XXX how should we handle IPv6 scope on SIOC[GS]IFPHYADDR? */ 671int 672gif_ioctl(ifp, cmd, data) 673 struct ifnet *ifp; 674 u_long cmd; 675 caddr_t data; 676{ 677 struct gif_softc *sc = ifp->if_softc; 678 struct ifreq *ifr = (struct ifreq*)data; 679 int error = 0, size; 680 u_int options; 681 struct sockaddr *dst, *src; 682#ifdef SIOCSIFMTU /* xxx */ 683 u_long mtu; 684#endif 685 686 switch (cmd) { 687 case SIOCSIFADDR: 688 ifp->if_flags |= IFF_UP; 689 break; 690 691 case SIOCADDMULTI: 692 case SIOCDELMULTI: 693 break; 694 695#ifdef SIOCSIFMTU /* xxx */ 696 case SIOCGIFMTU: 697 break; 698 699 case SIOCSIFMTU: 700 mtu = ifr->ifr_mtu; 701 if (mtu < GIF_MTU_MIN || mtu > GIF_MTU_MAX) 702 return (EINVAL); 703 ifp->if_mtu = mtu; 704 break; 705#endif /* SIOCSIFMTU */ 706 707#ifdef INET 708 case SIOCSIFPHYADDR: 709#endif 710#ifdef INET6 711 case SIOCSIFPHYADDR_IN6: 712#endif /* INET6 */ 713 switch (cmd) { 714#ifdef INET 715 case SIOCSIFPHYADDR: 716 src = (struct sockaddr *) 717 &(((struct in_aliasreq *)data)->ifra_addr); 718 dst = (struct sockaddr *) 719 &(((struct in_aliasreq *)data)->ifra_dstaddr); 720 break; 721#endif 722#ifdef INET6 723 case SIOCSIFPHYADDR_IN6: 724 src = (struct sockaddr *) 725 &(((struct in6_aliasreq *)data)->ifra_addr); 726 dst = (struct sockaddr *) 727 &(((struct in6_aliasreq *)data)->ifra_dstaddr); 728 break; 729#endif 730 default: 731 return EINVAL; 732 } 733 734 /* sa_family must be equal */ 735 if (src->sa_family != dst->sa_family) 736 return EINVAL; 737 738 /* validate sa_len */ 739 switch (src->sa_family) { 740#ifdef INET 741 case AF_INET: 742 if (src->sa_len != sizeof(struct sockaddr_in)) 743 return EINVAL; 744 break; 745#endif 746#ifdef INET6 747 case AF_INET6: 748 if (src->sa_len != sizeof(struct sockaddr_in6)) 749 return EINVAL; 750 break; 751#endif 752 default: 753 return EAFNOSUPPORT; 754 } 755 switch (dst->sa_family) { 756#ifdef INET 757 case AF_INET: 758 if (dst->sa_len != sizeof(struct sockaddr_in)) 759 return EINVAL; 760 break; 761#endif 762#ifdef INET6 763 case AF_INET6: 764 if (dst->sa_len != sizeof(struct sockaddr_in6)) 765 return EINVAL; 766 break; 767#endif 768 default: 769 return EAFNOSUPPORT; 770 } 771 772 /* check sa_family looks sane for the cmd */ 773 switch (cmd) { 774 case SIOCSIFPHYADDR: 775 if (src->sa_family == AF_INET) 776 break; 777 return EAFNOSUPPORT; 778#ifdef INET6 779 case SIOCSIFPHYADDR_IN6: 780 if (src->sa_family == AF_INET6) 781 break; 782 return EAFNOSUPPORT; 783#endif /* INET6 */ 784 } 785 786 error = gif_set_tunnel(GIF2IFP(sc), src, dst); 787 break; 788 789#ifdef SIOCDIFPHYADDR 790 case SIOCDIFPHYADDR: 791 gif_delete_tunnel(GIF2IFP(sc)); 792 break; 793#endif 794 795 case SIOCGIFPSRCADDR: 796#ifdef INET6 797 case SIOCGIFPSRCADDR_IN6: 798#endif /* INET6 */ 799 if (sc->gif_psrc == NULL) { 800 error = EADDRNOTAVAIL; 801 goto bad; 802 } 803 src = sc->gif_psrc; 804 switch (cmd) { 805#ifdef INET 806 case SIOCGIFPSRCADDR: 807 dst = &ifr->ifr_addr; 808 size = sizeof(ifr->ifr_addr); 809 break; 810#endif /* INET */ 811#ifdef INET6 812 case SIOCGIFPSRCADDR_IN6: 813 dst = (struct sockaddr *) 814 &(((struct in6_ifreq *)data)->ifr_addr); 815 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 816 break; 817#endif /* INET6 */ 818 default: 819 error = EADDRNOTAVAIL; 820 goto bad; 821 } 822 if (src->sa_len > size) 823 return EINVAL; 824 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 825#ifdef INET6 826 if (dst->sa_family == AF_INET6) { 827 error = sa6_recoverscope((struct sockaddr_in6 *)dst); 828 if (error != 0) 829 return (error); 830 } 831#endif 832 break; 833 834 case SIOCGIFPDSTADDR: 835#ifdef INET6 836 case SIOCGIFPDSTADDR_IN6: 837#endif /* INET6 */ 838 if (sc->gif_pdst == NULL) { 839 error = EADDRNOTAVAIL; 840 goto bad; 841 } 842 src = sc->gif_pdst; 843 switch (cmd) { 844#ifdef INET 845 case SIOCGIFPDSTADDR: 846 dst = &ifr->ifr_addr; 847 size = sizeof(ifr->ifr_addr); 848 break; 849#endif /* INET */ 850#ifdef INET6 851 case SIOCGIFPDSTADDR_IN6: 852 dst = (struct sockaddr *) 853 &(((struct in6_ifreq *)data)->ifr_addr); 854 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 855 break; 856#endif /* INET6 */ 857 default: 858 error = EADDRNOTAVAIL; 859 goto bad; 860 } 861 if (src->sa_len > size) 862 return EINVAL; 863 error = prison_if(curthread->td_ucred, src); 864 if (error != 0) 865 return (error); 866 error = prison_if(curthread->td_ucred, dst); 867 if (error != 0) 868 return (error); 869 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 870#ifdef INET6 871 if (dst->sa_family == AF_INET6) { 872 error = sa6_recoverscope((struct sockaddr_in6 *)dst); 873 if (error != 0) 874 return (error); 875 } 876#endif 877 break; 878 879 case SIOCSIFFLAGS: 880 /* if_ioctl() takes care of it */ 881 break; 882 883 case GIFGOPTS: 884 options = sc->gif_options; 885 error = copyout(&options, ifr->ifr_data, 886 sizeof(options)); 887 break; 888 889 case GIFSOPTS: 890 if ((error = priv_check(curthread, PRIV_NET_GIF)) != 0) 891 break; 892 error = copyin(ifr->ifr_data, &options, sizeof(options)); 893 if (error) 894 break; 895 if (options & ~GIF_OPTMASK) 896 error = EINVAL; 897 else 898 sc->gif_options = options; 899 break; 900 901 default: 902 error = EINVAL; 903 break; 904 } 905 bad: 906 return error; 907} 908 909/* 910 * XXXRW: There's a general event-ordering issue here: the code to check 911 * if a given tunnel is already present happens before we perform a 912 * potentially blocking setup of the tunnel. This code needs to be 913 * re-ordered so that the check and replacement can be atomic using 914 * a mutex. 915 */ 916int 917gif_set_tunnel(ifp, src, dst) 918 struct ifnet *ifp; 919 struct sockaddr *src; 920 struct sockaddr *dst; 921{ 922 struct gif_softc *sc = ifp->if_softc; 923 struct gif_softc *sc2; 924 struct sockaddr *osrc, *odst, *sa; 925 int error = 0; 926 927 mtx_lock(&gif_mtx); 928 LIST_FOREACH(sc2, &V_gif_softc_list, gif_list) { 929 if (sc2 == sc) 930 continue; 931 if (!sc2->gif_pdst || !sc2->gif_psrc) 932 continue; 933 if (sc2->gif_pdst->sa_family != dst->sa_family || 934 sc2->gif_pdst->sa_len != dst->sa_len || 935 sc2->gif_psrc->sa_family != src->sa_family || 936 sc2->gif_psrc->sa_len != src->sa_len) 937 continue; 938 939 /* 940 * Disallow parallel tunnels unless instructed 941 * otherwise. 942 */ 943 if (!V_parallel_tunnels && 944 bcmp(sc2->gif_pdst, dst, dst->sa_len) == 0 && 945 bcmp(sc2->gif_psrc, src, src->sa_len) == 0) { 946 error = EADDRNOTAVAIL; 947 mtx_unlock(&gif_mtx); 948 goto bad; 949 } 950 951 /* XXX both end must be valid? (I mean, not 0.0.0.0) */ 952 } 953 mtx_unlock(&gif_mtx); 954 955 /* XXX we can detach from both, but be polite just in case */ 956 if (sc->gif_psrc) 957 switch (sc->gif_psrc->sa_family) { 958#ifdef INET 959 case AF_INET: 960 (void)in_gif_detach(sc); 961 break; 962#endif 963#ifdef INET6 964 case AF_INET6: 965 (void)in6_gif_detach(sc); 966 break; 967#endif 968 } 969 970 osrc = sc->gif_psrc; 971 sa = (struct sockaddr *)malloc(src->sa_len, M_IFADDR, M_WAITOK); 972 bcopy((caddr_t)src, (caddr_t)sa, src->sa_len); 973 sc->gif_psrc = sa; 974 975 odst = sc->gif_pdst; 976 sa = (struct sockaddr *)malloc(dst->sa_len, M_IFADDR, M_WAITOK); 977 bcopy((caddr_t)dst, (caddr_t)sa, dst->sa_len); 978 sc->gif_pdst = sa; 979 980 switch (sc->gif_psrc->sa_family) { 981#ifdef INET 982 case AF_INET: 983 error = in_gif_attach(sc); 984 break; 985#endif 986#ifdef INET6 987 case AF_INET6: 988 /* 989 * Check validity of the scope zone ID of the addresses, and 990 * convert it into the kernel internal form if necessary. 991 */ 992 error = sa6_embedscope((struct sockaddr_in6 *)sc->gif_psrc, 0); 993 if (error != 0) 994 break; 995 error = sa6_embedscope((struct sockaddr_in6 *)sc->gif_pdst, 0); 996 if (error != 0) 997 break; 998 error = in6_gif_attach(sc); 999 break; 1000#endif 1001 } 1002 if (error) { 1003 /* rollback */ 1004 free((caddr_t)sc->gif_psrc, M_IFADDR); 1005 free((caddr_t)sc->gif_pdst, M_IFADDR); 1006 sc->gif_psrc = osrc; 1007 sc->gif_pdst = odst; 1008 goto bad; 1009 } 1010 1011 if (osrc) 1012 free((caddr_t)osrc, M_IFADDR); 1013 if (odst) 1014 free((caddr_t)odst, M_IFADDR); 1015 1016 bad: 1017 if (sc->gif_psrc && sc->gif_pdst) 1018 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1019 else 1020 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1021 1022 return error; 1023} 1024 1025void 1026gif_delete_tunnel(ifp) 1027 struct ifnet *ifp; 1028{ 1029 struct gif_softc *sc = ifp->if_softc; 1030 1031 if (sc->gif_psrc) { 1032 free((caddr_t)sc->gif_psrc, M_IFADDR); 1033 sc->gif_psrc = NULL; 1034 } 1035 if (sc->gif_pdst) { 1036 free((caddr_t)sc->gif_pdst, M_IFADDR); 1037 sc->gif_pdst = NULL; 1038 } 1039 /* it is safe to detach from both */ 1040#ifdef INET 1041 (void)in_gif_detach(sc); 1042#endif 1043#ifdef INET6 1044 (void)in6_gif_detach(sc); 1045#endif 1046 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1047} 1048