if_gif.c revision 227309
1/* $FreeBSD: head/sys/net/if_gif.c 227309 2011-11-07 15:43:11Z ed $ */ 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_clone.h> 57#include <net/if_types.h> 58#include <net/netisr.h> 59#include <net/route.h> 60#include <net/bpf.h> 61#include <net/vnet.h> 62 63#include <netinet/in.h> 64#include <netinet/in_systm.h> 65#include <netinet/ip.h> 66#ifdef INET 67#include <netinet/in_var.h> 68#include <netinet/in_gif.h> 69#include <netinet/ip_var.h> 70#endif /* INET */ 71 72#ifdef INET6 73#ifndef INET 74#include <netinet/in.h> 75#endif 76#include <netinet6/in6_var.h> 77#include <netinet/ip6.h> 78#include <netinet6/ip6_var.h> 79#include <netinet6/scope6_var.h> 80#include <netinet6/in6_gif.h> 81#include <netinet6/ip6protosw.h> 82#endif /* INET6 */ 83 84#include <netinet/ip_encap.h> 85#include <net/ethernet.h> 86#include <net/if_bridgevar.h> 87#include <net/if_gif.h> 88 89#include <security/mac/mac_framework.h> 90 91#define GIFNAME "gif" 92 93/* 94 * gif_mtx protects the global gif_softc_list. 95 */ 96static struct mtx gif_mtx; 97static MALLOC_DEFINE(M_GIF, "gif", "Generic Tunnel Interface"); 98static VNET_DEFINE(LIST_HEAD(, gif_softc), gif_softc_list); 99#define V_gif_softc_list VNET(gif_softc_list) 100 101void (*ng_gif_input_p)(struct ifnet *ifp, struct mbuf **mp, int af); 102void (*ng_gif_input_orphan_p)(struct ifnet *ifp, struct mbuf *m, int af); 103void (*ng_gif_attach_p)(struct ifnet *ifp); 104void (*ng_gif_detach_p)(struct ifnet *ifp); 105 106static void gif_start(struct ifnet *); 107static int gif_clone_create(struct if_clone *, int, caddr_t); 108static void gif_clone_destroy(struct ifnet *); 109 110IFC_SIMPLE_DECLARE(gif, 0); 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), ifc->ifc_name, unit); 175 176 sc->encap_cookie4 = sc->encap_cookie6 = NULL; 177 sc->gif_options = GIF_ACCEPT_REVETHIP; 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 if_clone_attach(&gif_cloner); 260 break; 261 262 case MOD_UNLOAD: 263 if_clone_detach(&gif_cloner); 264 mtx_destroy(&gif_mtx); 265 break; 266 default: 267 return EOPNOTSUPP; 268 } 269 return 0; 270} 271 272static moduledata_t gif_mod = { 273 "if_gif", 274 gifmodevent, 275 0 276}; 277 278DECLARE_MODULE(if_gif, gif_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 279MODULE_VERSION(if_gif, 1); 280 281int 282gif_encapcheck(m, off, proto, arg) 283 const struct mbuf *m; 284 int off; 285 int proto; 286 void *arg; 287{ 288 struct ip ip; 289 struct gif_softc *sc; 290 291 sc = (struct gif_softc *)arg; 292 if (sc == NULL) 293 return 0; 294 295 if ((GIF2IFP(sc)->if_flags & IFF_UP) == 0) 296 return 0; 297 298 /* no physical address */ 299 if (!sc->gif_psrc || !sc->gif_pdst) 300 return 0; 301 302 switch (proto) { 303#ifdef INET 304 case IPPROTO_IPV4: 305 break; 306#endif 307#ifdef INET6 308 case IPPROTO_IPV6: 309 break; 310#endif 311 case IPPROTO_ETHERIP: 312 break; 313 314 default: 315 return 0; 316 } 317 318 /* Bail on short packets */ 319 if (m->m_pkthdr.len < sizeof(ip)) 320 return 0; 321 322 m_copydata(m, 0, sizeof(ip), (caddr_t)&ip); 323 324 switch (ip.ip_v) { 325#ifdef INET 326 case 4: 327 if (sc->gif_psrc->sa_family != AF_INET || 328 sc->gif_pdst->sa_family != AF_INET) 329 return 0; 330 return gif_encapcheck4(m, off, proto, arg); 331#endif 332#ifdef INET6 333 case 6: 334 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) 335 return 0; 336 if (sc->gif_psrc->sa_family != AF_INET6 || 337 sc->gif_pdst->sa_family != AF_INET6) 338 return 0; 339 return gif_encapcheck6(m, off, proto, arg); 340#endif 341 default: 342 return 0; 343 } 344} 345 346static void 347gif_start(struct ifnet *ifp) 348{ 349 struct gif_softc *sc; 350 struct mbuf *m; 351 352 sc = ifp->if_softc; 353 354 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 355 for (;;) { 356 IFQ_DEQUEUE(&ifp->if_snd, m); 357 if (m == 0) 358 break; 359 360 gif_output(ifp, m, sc->gif_pdst, NULL); 361 362 } 363 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 364 365 return; 366} 367 368int 369gif_output(ifp, m, dst, ro) 370 struct ifnet *ifp; 371 struct mbuf *m; 372 struct sockaddr *dst; 373 struct route *ro; 374{ 375 struct gif_softc *sc = ifp->if_softc; 376 struct m_tag *mtag; 377 int error = 0; 378 int gif_called; 379 u_int32_t af; 380 381#ifdef MAC 382 error = mac_ifnet_check_transmit(ifp, m); 383 if (error) { 384 m_freem(m); 385 goto end; 386 } 387#endif 388 389 /* 390 * gif may cause infinite recursion calls when misconfigured. 391 * We'll prevent this by detecting loops. 392 * 393 * High nesting level may cause stack exhaustion. 394 * We'll prevent this by introducing upper limit. 395 */ 396 gif_called = 1; 397 mtag = m_tag_locate(m, MTAG_GIF, MTAG_GIF_CALLED, NULL); 398 while (mtag != NULL) { 399 if (*(struct ifnet **)(mtag + 1) == ifp) { 400 log(LOG_NOTICE, 401 "gif_output: loop detected on %s\n", 402 (*(struct ifnet **)(mtag + 1))->if_xname); 403 m_freem(m); 404 error = EIO; /* is there better errno? */ 405 goto end; 406 } 407 mtag = m_tag_locate(m, MTAG_GIF, MTAG_GIF_CALLED, mtag); 408 gif_called++; 409 } 410 if (gif_called > V_max_gif_nesting) { 411 log(LOG_NOTICE, 412 "gif_output: recursively called too many times(%d)\n", 413 gif_called); 414 m_freem(m); 415 error = EIO; /* is there better errno? */ 416 goto end; 417 } 418 mtag = m_tag_alloc(MTAG_GIF, MTAG_GIF_CALLED, sizeof(struct ifnet *), 419 M_NOWAIT); 420 if (mtag == NULL) { 421 m_freem(m); 422 error = ENOMEM; 423 goto end; 424 } 425 *(struct ifnet **)(mtag + 1) = ifp; 426 m_tag_prepend(m, mtag); 427 428 m->m_flags &= ~(M_BCAST|M_MCAST); 429 430 GIF_LOCK(sc); 431 432 if (!(ifp->if_flags & IFF_UP) || 433 sc->gif_psrc == NULL || sc->gif_pdst == NULL) { 434 GIF_UNLOCK(sc); 435 m_freem(m); 436 error = ENETDOWN; 437 goto end; 438 } 439 440 /* BPF writes need to be handled specially. */ 441 if (dst->sa_family == AF_UNSPEC) { 442 bcopy(dst->sa_data, &af, sizeof(af)); 443 dst->sa_family = af; 444 } 445 446 af = dst->sa_family; 447 BPF_MTAP2(ifp, &af, sizeof(af), m); 448 ifp->if_opackets++; 449 ifp->if_obytes += m->m_pkthdr.len; 450 451 /* override to IPPROTO_ETHERIP for bridged traffic */ 452 if (ifp->if_bridge) 453 af = AF_LINK; 454 455 M_SETFIB(m, sc->gif_fibnum); 456 /* inner AF-specific encapsulation */ 457 458 /* XXX should we check if our outer source is legal? */ 459 460 /* dispatch to output logic based on outer AF */ 461 switch (sc->gif_psrc->sa_family) { 462#ifdef INET 463 case AF_INET: 464 error = in_gif_output(ifp, af, m); 465 break; 466#endif 467#ifdef INET6 468 case AF_INET6: 469 error = in6_gif_output(ifp, af, m); 470 break; 471#endif 472 default: 473 m_freem(m); 474 error = ENETDOWN; 475 } 476 477 GIF_UNLOCK(sc); 478 end: 479 if (error) 480 ifp->if_oerrors++; 481 return (error); 482} 483 484void 485gif_input(m, af, ifp) 486 struct mbuf *m; 487 int af; 488 struct ifnet *ifp; 489{ 490 int isr, n; 491 struct gif_softc *sc; 492 struct etherip_header *eip; 493 struct ether_header *eh; 494 struct ifnet *oldifp; 495 496 if (ifp == NULL) { 497 /* just in case */ 498 m_freem(m); 499 return; 500 } 501 sc = ifp->if_softc; 502 m->m_pkthdr.rcvif = ifp; 503 504#ifdef MAC 505 mac_ifnet_create_mbuf(ifp, m); 506#endif 507 508 if (bpf_peers_present(ifp->if_bpf)) { 509 u_int32_t af1 = af; 510 bpf_mtap2(ifp->if_bpf, &af1, sizeof(af1), m); 511 } 512 513 if (ng_gif_input_p != NULL) { 514 (*ng_gif_input_p)(ifp, &m, af); 515 if (m == NULL) 516 return; 517 } 518 519 /* 520 * Put the packet to the network layer input queue according to the 521 * specified address family. 522 * Note: older versions of gif_input directly called network layer 523 * input functions, e.g. ip6_input, here. We changed the policy to 524 * prevent too many recursive calls of such input functions, which 525 * might cause kernel panic. But the change may introduce another 526 * problem; if the input queue is full, packets are discarded. 527 * The kernel stack overflow really happened, and we believed 528 * queue-full rarely occurs, so we changed the policy. 529 */ 530 switch (af) { 531#ifdef INET 532 case AF_INET: 533 isr = NETISR_IP; 534 break; 535#endif 536#ifdef INET6 537 case AF_INET6: 538 isr = NETISR_IPV6; 539 break; 540#endif 541 case AF_LINK: 542 n = sizeof(struct etherip_header) + sizeof(struct ether_header); 543 if (n > m->m_len) { 544 m = m_pullup(m, n); 545 if (m == NULL) { 546 ifp->if_ierrors++; 547 return; 548 } 549 } 550 551 eip = mtod(m, struct etherip_header *); 552 /* 553 * GIF_ACCEPT_REVETHIP (enabled by default) intentionally 554 * accepts an EtherIP packet with revered version field in 555 * the header. This is a knob for backward compatibility 556 * with FreeBSD 7.2R or prior. 557 */ 558 if (sc->gif_options & GIF_ACCEPT_REVETHIP) { 559 if (eip->eip_resvl != ETHERIP_VERSION 560 && eip->eip_ver != ETHERIP_VERSION) { 561 /* discard unknown versions */ 562 m_freem(m); 563 return; 564 } 565 } else { 566 if (eip->eip_ver != ETHERIP_VERSION) { 567 /* discard unknown versions */ 568 m_freem(m); 569 return; 570 } 571 } 572 m_adj(m, sizeof(struct etherip_header)); 573 574 m->m_flags &= ~(M_BCAST|M_MCAST); 575 m->m_pkthdr.rcvif = ifp; 576 577 if (ifp->if_bridge) { 578 oldifp = ifp; 579 eh = mtod(m, struct ether_header *); 580 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 581 if (ETHER_IS_BROADCAST(eh->ether_dhost)) 582 m->m_flags |= M_BCAST; 583 else 584 m->m_flags |= M_MCAST; 585 ifp->if_imcasts++; 586 } 587 BRIDGE_INPUT(ifp, m); 588 589 if (m != NULL && ifp != oldifp) { 590 /* 591 * The bridge gave us back itself or one of the 592 * members for which the frame is addressed. 593 */ 594 ether_demux(ifp, m); 595 return; 596 } 597 } 598 if (m != NULL) 599 m_freem(m); 600 return; 601 602 default: 603 if (ng_gif_input_orphan_p != NULL) 604 (*ng_gif_input_orphan_p)(ifp, m, af); 605 else 606 m_freem(m); 607 return; 608 } 609 610 ifp->if_ipackets++; 611 ifp->if_ibytes += m->m_pkthdr.len; 612 M_SETFIB(m, ifp->if_fib); 613 netisr_dispatch(isr, m); 614} 615 616/* XXX how should we handle IPv6 scope on SIOC[GS]IFPHYADDR? */ 617int 618gif_ioctl(ifp, cmd, data) 619 struct ifnet *ifp; 620 u_long cmd; 621 caddr_t data; 622{ 623 struct gif_softc *sc = ifp->if_softc; 624 struct ifreq *ifr = (struct ifreq*)data; 625 int error = 0, size; 626 u_int options; 627 struct sockaddr *dst, *src; 628#ifdef SIOCSIFMTU /* xxx */ 629 u_long mtu; 630#endif 631 632 switch (cmd) { 633 case SIOCSIFADDR: 634 ifp->if_flags |= IFF_UP; 635 break; 636 637 case SIOCSIFDSTADDR: 638 break; 639 640 case SIOCADDMULTI: 641 case SIOCDELMULTI: 642 break; 643 644#ifdef SIOCSIFMTU /* xxx */ 645 case SIOCGIFMTU: 646 break; 647 648 case SIOCSIFMTU: 649 mtu = ifr->ifr_mtu; 650 if (mtu < GIF_MTU_MIN || mtu > GIF_MTU_MAX) 651 return (EINVAL); 652 ifp->if_mtu = mtu; 653 break; 654#endif /* SIOCSIFMTU */ 655 656#ifdef INET 657 case SIOCSIFPHYADDR: 658#endif 659#ifdef INET6 660 case SIOCSIFPHYADDR_IN6: 661#endif /* INET6 */ 662 case SIOCSLIFPHYADDR: 663 switch (cmd) { 664#ifdef INET 665 case SIOCSIFPHYADDR: 666 src = (struct sockaddr *) 667 &(((struct in_aliasreq *)data)->ifra_addr); 668 dst = (struct sockaddr *) 669 &(((struct in_aliasreq *)data)->ifra_dstaddr); 670 break; 671#endif 672#ifdef INET6 673 case SIOCSIFPHYADDR_IN6: 674 src = (struct sockaddr *) 675 &(((struct in6_aliasreq *)data)->ifra_addr); 676 dst = (struct sockaddr *) 677 &(((struct in6_aliasreq *)data)->ifra_dstaddr); 678 break; 679#endif 680 case SIOCSLIFPHYADDR: 681 src = (struct sockaddr *) 682 &(((struct if_laddrreq *)data)->addr); 683 dst = (struct sockaddr *) 684 &(((struct if_laddrreq *)data)->dstaddr); 685 break; 686 default: 687 return EINVAL; 688 } 689 690 /* sa_family must be equal */ 691 if (src->sa_family != dst->sa_family) 692 return EINVAL; 693 694 /* validate sa_len */ 695 switch (src->sa_family) { 696#ifdef INET 697 case AF_INET: 698 if (src->sa_len != sizeof(struct sockaddr_in)) 699 return EINVAL; 700 break; 701#endif 702#ifdef INET6 703 case AF_INET6: 704 if (src->sa_len != sizeof(struct sockaddr_in6)) 705 return EINVAL; 706 break; 707#endif 708 default: 709 return EAFNOSUPPORT; 710 } 711 switch (dst->sa_family) { 712#ifdef INET 713 case AF_INET: 714 if (dst->sa_len != sizeof(struct sockaddr_in)) 715 return EINVAL; 716 break; 717#endif 718#ifdef INET6 719 case AF_INET6: 720 if (dst->sa_len != sizeof(struct sockaddr_in6)) 721 return EINVAL; 722 break; 723#endif 724 default: 725 return EAFNOSUPPORT; 726 } 727 728 /* check sa_family looks sane for the cmd */ 729 switch (cmd) { 730 case SIOCSIFPHYADDR: 731 if (src->sa_family == AF_INET) 732 break; 733 return EAFNOSUPPORT; 734#ifdef INET6 735 case SIOCSIFPHYADDR_IN6: 736 if (src->sa_family == AF_INET6) 737 break; 738 return EAFNOSUPPORT; 739#endif /* INET6 */ 740 case SIOCSLIFPHYADDR: 741 /* checks done in the above */ 742 break; 743 } 744 745 error = gif_set_tunnel(GIF2IFP(sc), src, dst); 746 break; 747 748#ifdef SIOCDIFPHYADDR 749 case SIOCDIFPHYADDR: 750 gif_delete_tunnel(GIF2IFP(sc)); 751 break; 752#endif 753 754 case SIOCGIFPSRCADDR: 755#ifdef INET6 756 case SIOCGIFPSRCADDR_IN6: 757#endif /* INET6 */ 758 if (sc->gif_psrc == NULL) { 759 error = EADDRNOTAVAIL; 760 goto bad; 761 } 762 src = sc->gif_psrc; 763 switch (cmd) { 764#ifdef INET 765 case SIOCGIFPSRCADDR: 766 dst = &ifr->ifr_addr; 767 size = sizeof(ifr->ifr_addr); 768 break; 769#endif /* INET */ 770#ifdef INET6 771 case SIOCGIFPSRCADDR_IN6: 772 dst = (struct sockaddr *) 773 &(((struct in6_ifreq *)data)->ifr_addr); 774 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 775 break; 776#endif /* INET6 */ 777 default: 778 error = EADDRNOTAVAIL; 779 goto bad; 780 } 781 if (src->sa_len > size) 782 return EINVAL; 783 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 784#ifdef INET6 785 if (dst->sa_family == AF_INET6) { 786 error = sa6_recoverscope((struct sockaddr_in6 *)dst); 787 if (error != 0) 788 return (error); 789 } 790#endif 791 break; 792 793 case SIOCGIFPDSTADDR: 794#ifdef INET6 795 case SIOCGIFPDSTADDR_IN6: 796#endif /* INET6 */ 797 if (sc->gif_pdst == NULL) { 798 error = EADDRNOTAVAIL; 799 goto bad; 800 } 801 src = sc->gif_pdst; 802 switch (cmd) { 803#ifdef INET 804 case SIOCGIFPDSTADDR: 805 dst = &ifr->ifr_addr; 806 size = sizeof(ifr->ifr_addr); 807 break; 808#endif /* INET */ 809#ifdef INET6 810 case SIOCGIFPDSTADDR_IN6: 811 dst = (struct sockaddr *) 812 &(((struct in6_ifreq *)data)->ifr_addr); 813 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 814 break; 815#endif /* INET6 */ 816 default: 817 error = EADDRNOTAVAIL; 818 goto bad; 819 } 820 if (src->sa_len > size) 821 return EINVAL; 822 error = prison_if(curthread->td_ucred, src); 823 if (error != 0) 824 return (error); 825 error = prison_if(curthread->td_ucred, dst); 826 if (error != 0) 827 return (error); 828 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 829#ifdef INET6 830 if (dst->sa_family == AF_INET6) { 831 error = sa6_recoverscope((struct sockaddr_in6 *)dst); 832 if (error != 0) 833 return (error); 834 } 835#endif 836 break; 837 838 case SIOCGLIFPHYADDR: 839 if (sc->gif_psrc == NULL || sc->gif_pdst == NULL) { 840 error = EADDRNOTAVAIL; 841 goto bad; 842 } 843 844 /* copy src */ 845 src = sc->gif_psrc; 846 dst = (struct sockaddr *) 847 &(((struct if_laddrreq *)data)->addr); 848 size = sizeof(((struct if_laddrreq *)data)->addr); 849 if (src->sa_len > size) 850 return EINVAL; 851 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 852 853 /* copy dst */ 854 src = sc->gif_pdst; 855 dst = (struct sockaddr *) 856 &(((struct if_laddrreq *)data)->dstaddr); 857 size = sizeof(((struct if_laddrreq *)data)->dstaddr); 858 if (src->sa_len > size) 859 return EINVAL; 860 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 861 break; 862 863 case SIOCSIFFLAGS: 864 /* if_ioctl() takes care of it */ 865 break; 866 867 case GIFGOPTS: 868 options = sc->gif_options; 869 error = copyout(&options, ifr->ifr_data, 870 sizeof(options)); 871 break; 872 873 case GIFSOPTS: 874 if ((error = priv_check(curthread, PRIV_NET_GIF)) != 0) 875 break; 876 error = copyin(ifr->ifr_data, &options, sizeof(options)); 877 if (error) 878 break; 879 if (options & ~GIF_OPTMASK) 880 error = EINVAL; 881 else 882 sc->gif_options = options; 883 break; 884 885 default: 886 error = EINVAL; 887 break; 888 } 889 bad: 890 return error; 891} 892 893/* 894 * XXXRW: There's a general event-ordering issue here: the code to check 895 * if a given tunnel is already present happens before we perform a 896 * potentially blocking setup of the tunnel. This code needs to be 897 * re-ordered so that the check and replacement can be atomic using 898 * a mutex. 899 */ 900int 901gif_set_tunnel(ifp, src, dst) 902 struct ifnet *ifp; 903 struct sockaddr *src; 904 struct sockaddr *dst; 905{ 906 struct gif_softc *sc = ifp->if_softc; 907 struct gif_softc *sc2; 908 struct sockaddr *osrc, *odst, *sa; 909 int error = 0; 910 911 mtx_lock(&gif_mtx); 912 LIST_FOREACH(sc2, &V_gif_softc_list, gif_list) { 913 if (sc2 == sc) 914 continue; 915 if (!sc2->gif_pdst || !sc2->gif_psrc) 916 continue; 917 if (sc2->gif_pdst->sa_family != dst->sa_family || 918 sc2->gif_pdst->sa_len != dst->sa_len || 919 sc2->gif_psrc->sa_family != src->sa_family || 920 sc2->gif_psrc->sa_len != src->sa_len) 921 continue; 922 923 /* 924 * Disallow parallel tunnels unless instructed 925 * otherwise. 926 */ 927 if (!V_parallel_tunnels && 928 bcmp(sc2->gif_pdst, dst, dst->sa_len) == 0 && 929 bcmp(sc2->gif_psrc, src, src->sa_len) == 0) { 930 error = EADDRNOTAVAIL; 931 mtx_unlock(&gif_mtx); 932 goto bad; 933 } 934 935 /* XXX both end must be valid? (I mean, not 0.0.0.0) */ 936 } 937 mtx_unlock(&gif_mtx); 938 939 /* XXX we can detach from both, but be polite just in case */ 940 if (sc->gif_psrc) 941 switch (sc->gif_psrc->sa_family) { 942#ifdef INET 943 case AF_INET: 944 (void)in_gif_detach(sc); 945 break; 946#endif 947#ifdef INET6 948 case AF_INET6: 949 (void)in6_gif_detach(sc); 950 break; 951#endif 952 } 953 954 osrc = sc->gif_psrc; 955 sa = (struct sockaddr *)malloc(src->sa_len, M_IFADDR, M_WAITOK); 956 bcopy((caddr_t)src, (caddr_t)sa, src->sa_len); 957 sc->gif_psrc = sa; 958 959 odst = sc->gif_pdst; 960 sa = (struct sockaddr *)malloc(dst->sa_len, M_IFADDR, M_WAITOK); 961 bcopy((caddr_t)dst, (caddr_t)sa, dst->sa_len); 962 sc->gif_pdst = sa; 963 964 switch (sc->gif_psrc->sa_family) { 965#ifdef INET 966 case AF_INET: 967 error = in_gif_attach(sc); 968 break; 969#endif 970#ifdef INET6 971 case AF_INET6: 972 /* 973 * Check validity of the scope zone ID of the addresses, and 974 * convert it into the kernel internal form if necessary. 975 */ 976 error = sa6_embedscope((struct sockaddr_in6 *)sc->gif_psrc, 0); 977 if (error != 0) 978 break; 979 error = sa6_embedscope((struct sockaddr_in6 *)sc->gif_pdst, 0); 980 if (error != 0) 981 break; 982 error = in6_gif_attach(sc); 983 break; 984#endif 985 } 986 if (error) { 987 /* rollback */ 988 free((caddr_t)sc->gif_psrc, M_IFADDR); 989 free((caddr_t)sc->gif_pdst, M_IFADDR); 990 sc->gif_psrc = osrc; 991 sc->gif_pdst = odst; 992 goto bad; 993 } 994 995 if (osrc) 996 free((caddr_t)osrc, M_IFADDR); 997 if (odst) 998 free((caddr_t)odst, M_IFADDR); 999 1000 bad: 1001 if (sc->gif_psrc && sc->gif_pdst) 1002 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1003 else 1004 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1005 1006 return error; 1007} 1008 1009void 1010gif_delete_tunnel(ifp) 1011 struct ifnet *ifp; 1012{ 1013 struct gif_softc *sc = ifp->if_softc; 1014 1015 if (sc->gif_psrc) { 1016 free((caddr_t)sc->gif_psrc, M_IFADDR); 1017 sc->gif_psrc = NULL; 1018 } 1019 if (sc->gif_pdst) { 1020 free((caddr_t)sc->gif_pdst, M_IFADDR); 1021 sc->gif_pdst = NULL; 1022 } 1023 /* it is safe to detach from both */ 1024#ifdef INET 1025 (void)in_gif_detach(sc); 1026#endif 1027#ifdef INET6 1028 (void)in6_gif_detach(sc); 1029#endif 1030 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1031} 1032