if_gif.c revision 159174
1/* $FreeBSD: head/sys/net/if_gif.c 159174 2006-06-02 14:10:52Z 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#include "opt_mac.h" 36 37#include <sys/param.h> 38#include <sys/systm.h> 39#include <sys/kernel.h> 40#include <sys/mac.h> 41#include <sys/malloc.h> 42#include <sys/mbuf.h> 43#include <sys/module.h> 44#include <sys/socket.h> 45#include <sys/sockio.h> 46#include <sys/errno.h> 47#include <sys/time.h> 48#include <sys/sysctl.h> 49#include <sys/syslog.h> 50#include <sys/protosw.h> 51#include <sys/conf.h> 52#include <machine/cpu.h> 53 54#include <net/if.h> 55#include <net/if_clone.h> 56#include <net/if_types.h> 57#include <net/netisr.h> 58#include <net/route.h> 59#include <net/bpf.h> 60 61#include <netinet/in.h> 62#include <netinet/in_systm.h> 63#include <netinet/ip.h> 64#ifdef INET 65#include <netinet/in_var.h> 66#include <netinet/in_gif.h> 67#include <netinet/ip_var.h> 68#endif /* INET */ 69 70#ifdef INET6 71#ifndef INET 72#include <netinet/in.h> 73#endif 74#include <netinet6/in6_var.h> 75#include <netinet/ip6.h> 76#include <netinet6/ip6_var.h> 77#include <netinet6/scope6_var.h> 78#include <netinet6/in6_gif.h> 79#include <netinet6/ip6protosw.h> 80#endif /* INET6 */ 81 82#include <netinet/ip_encap.h> 83#include <net/ethernet.h> 84#include <net/if_bridgevar.h> 85#include <net/if_gif.h> 86 87#include <net/net_osdep.h> 88 89#define GIFNAME "gif" 90 91/* 92 * gif_mtx protects the global gif_softc_list. 93 */ 94static struct mtx gif_mtx; 95static MALLOC_DEFINE(M_GIF, "gif", "Generic Tunnel Interface"); 96static LIST_HEAD(, gif_softc) gif_softc_list; 97 98void (*ng_gif_input_p)(struct ifnet *ifp, struct mbuf **mp, int af); 99void (*ng_gif_input_orphan_p)(struct ifnet *ifp, struct mbuf *m, int af); 100void (*ng_gif_attach_p)(struct ifnet *ifp); 101void (*ng_gif_detach_p)(struct ifnet *ifp); 102 103static void gif_start(struct ifnet *); 104static int gif_clone_create(struct if_clone *, int); 105static void gif_clone_destroy(struct ifnet *); 106 107IFC_SIMPLE_DECLARE(gif, 0); 108 109static int gifmodevent(module_t, int, void *); 110 111SYSCTL_DECL(_net_link); 112SYSCTL_NODE(_net_link, IFT_GIF, gif, CTLFLAG_RW, 0, 113 "Generic Tunnel Interface"); 114#ifndef MAX_GIF_NEST 115/* 116 * This macro controls the default upper limitation on nesting of gif tunnels. 117 * Since, setting a large value to this macro with a careless configuration 118 * may introduce system crash, we don't allow any nestings by default. 119 * If you need to configure nested gif tunnels, you can define this macro 120 * in your kernel configuration file. However, if you do so, please be 121 * careful to configure the tunnels so that it won't make a loop. 122 */ 123#define MAX_GIF_NEST 1 124#endif 125static int max_gif_nesting = MAX_GIF_NEST; 126SYSCTL_INT(_net_link_gif, OID_AUTO, max_nesting, CTLFLAG_RW, 127 &max_gif_nesting, 0, "Max nested tunnels"); 128 129/* 130 * By default, we disallow creation of multiple tunnels between the same 131 * pair of addresses. Some applications require this functionality so 132 * we allow control over this check here. 133 */ 134#ifdef XBONEHACK 135static int parallel_tunnels = 1; 136#else 137static int parallel_tunnels = 0; 138#endif 139SYSCTL_INT(_net_link_gif, OID_AUTO, parallel_tunnels, CTLFLAG_RW, 140 ¶llel_tunnels, 0, "Allow parallel tunnels?"); 141 142static int 143gif_clone_create(ifc, unit) 144 struct if_clone *ifc; 145 int unit; 146{ 147 struct gif_softc *sc; 148 149 sc = malloc(sizeof(struct gif_softc), M_GIF, M_WAITOK | M_ZERO); 150 GIF2IFP(sc) = if_alloc(IFT_GIF); 151 if (GIF2IFP(sc) == NULL) { 152 free(sc, M_GIF); 153 return (ENOSPC); 154 } 155 156 GIF_LOCK_INIT(sc); 157 158 GIF2IFP(sc)->if_softc = sc; 159 if_initname(GIF2IFP(sc), ifc->ifc_name, unit); 160 161 sc->encap_cookie4 = sc->encap_cookie6 = NULL; 162 163 GIF2IFP(sc)->if_addrlen = 0; 164 GIF2IFP(sc)->if_mtu = GIF_MTU; 165 GIF2IFP(sc)->if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 166#if 0 167 /* turn off ingress filter */ 168 GIF2IFP(sc)->if_flags |= IFF_LINK2; 169#endif 170 GIF2IFP(sc)->if_ioctl = gif_ioctl; 171 GIF2IFP(sc)->if_start = gif_start; 172 GIF2IFP(sc)->if_output = gif_output; 173 GIF2IFP(sc)->if_snd.ifq_maxlen = IFQ_MAXLEN; 174 if_attach(GIF2IFP(sc)); 175 bpfattach(GIF2IFP(sc), DLT_NULL, sizeof(u_int32_t)); 176 if (ng_gif_attach_p != NULL) 177 (*ng_gif_attach_p)(GIF2IFP(sc)); 178 179 mtx_lock(&gif_mtx); 180 LIST_INSERT_HEAD(&gif_softc_list, sc, gif_list); 181 mtx_unlock(&gif_mtx); 182 183 return (0); 184} 185 186static void 187gif_clone_destroy(ifp) 188 struct ifnet *ifp; 189{ 190 int err; 191 struct gif_softc *sc = ifp->if_softc; 192 193 mtx_lock(&gif_mtx); 194 LIST_REMOVE(sc, gif_list); 195 mtx_unlock(&gif_mtx); 196 197 gif_delete_tunnel(ifp); 198#ifdef INET6 199 if (sc->encap_cookie6 != NULL) { 200 err = encap_detach(sc->encap_cookie6); 201 KASSERT(err == 0, ("Unexpected error detaching encap_cookie6")); 202 } 203#endif 204#ifdef INET 205 if (sc->encap_cookie4 != NULL) { 206 err = encap_detach(sc->encap_cookie4); 207 KASSERT(err == 0, ("Unexpected error detaching encap_cookie4")); 208 } 209#endif 210 211 if (ng_gif_detach_p != NULL) 212 (*ng_gif_detach_p)(ifp); 213 bpfdetach(ifp); 214 if_detach(ifp); 215 if_free(ifp); 216 217 GIF_LOCK_DESTROY(sc); 218 219 free(sc, M_GIF); 220} 221 222static int 223gifmodevent(mod, type, data) 224 module_t mod; 225 int type; 226 void *data; 227{ 228 229 switch (type) { 230 case MOD_LOAD: 231 mtx_init(&gif_mtx, "gif_mtx", NULL, MTX_DEF); 232 LIST_INIT(&gif_softc_list); 233 if_clone_attach(&gif_cloner); 234 235#ifdef INET6 236 ip6_gif_hlim = GIF_HLIM; 237#endif 238 239 break; 240 case MOD_UNLOAD: 241 if_clone_detach(&gif_cloner); 242 mtx_destroy(&gif_mtx); 243#ifdef INET6 244 ip6_gif_hlim = 0; 245#endif 246 break; 247 default: 248 return EOPNOTSUPP; 249 } 250 return 0; 251} 252 253static moduledata_t gif_mod = { 254 "if_gif", 255 gifmodevent, 256 0 257}; 258 259DECLARE_MODULE(if_gif, gif_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 260MODULE_VERSION(if_gif, 1); 261 262int 263gif_encapcheck(m, off, proto, arg) 264 const struct mbuf *m; 265 int off; 266 int proto; 267 void *arg; 268{ 269 struct ip ip; 270 struct gif_softc *sc; 271 272 sc = (struct gif_softc *)arg; 273 if (sc == NULL) 274 return 0; 275 276 if ((GIF2IFP(sc)->if_flags & IFF_UP) == 0) 277 return 0; 278 279 /* no physical address */ 280 if (!sc->gif_psrc || !sc->gif_pdst) 281 return 0; 282 283 switch (proto) { 284#ifdef INET 285 case IPPROTO_IPV4: 286 break; 287#endif 288#ifdef INET6 289 case IPPROTO_IPV6: 290 break; 291#endif 292 case IPPROTO_ETHERIP: 293 break; 294 295 default: 296 return 0; 297 } 298 299 /* Bail on short packets */ 300 if (m->m_pkthdr.len < sizeof(ip)) 301 return 0; 302 303 m_copydata(m, 0, sizeof(ip), (caddr_t)&ip); 304 305 switch (ip.ip_v) { 306#ifdef INET 307 case 4: 308 if (sc->gif_psrc->sa_family != AF_INET || 309 sc->gif_pdst->sa_family != AF_INET) 310 return 0; 311 return gif_encapcheck4(m, off, proto, arg); 312#endif 313#ifdef INET6 314 case 6: 315 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) 316 return 0; 317 if (sc->gif_psrc->sa_family != AF_INET6 || 318 sc->gif_pdst->sa_family != AF_INET6) 319 return 0; 320 return gif_encapcheck6(m, off, proto, arg); 321#endif 322 default: 323 return 0; 324 } 325} 326 327static void 328gif_start(struct ifnet *ifp) 329{ 330 struct gif_softc *sc; 331 struct mbuf *m; 332 333 sc = ifp->if_softc; 334 335 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 336 for (;;) { 337 IFQ_DEQUEUE(&ifp->if_snd, m); 338 if (m == 0) 339 break; 340 341 gif_output(ifp, m, sc->gif_pdst, NULL); 342 343 } 344 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 345 346 return; 347} 348 349int 350gif_output(ifp, m, dst, rt) 351 struct ifnet *ifp; 352 struct mbuf *m; 353 struct sockaddr *dst; 354 struct rtentry *rt; /* added in net2 */ 355{ 356 struct gif_softc *sc = ifp->if_softc; 357 struct m_tag *mtag; 358 int error = 0; 359 int gif_called; 360 u_int32_t af; 361 362#ifdef MAC 363 error = mac_check_ifnet_transmit(ifp, m); 364 if (error) { 365 m_freem(m); 366 goto end; 367 } 368#endif 369 370 /* 371 * gif may cause infinite recursion calls when misconfigured. 372 * We'll prevent this by detecting loops. 373 * 374 * High nesting level may cause stack exhaustion. 375 * We'll prevent this by introducing upper limit. 376 */ 377 gif_called = 1; 378 mtag = m_tag_locate(m, MTAG_GIF, MTAG_GIF_CALLED, NULL); 379 while (mtag != NULL) { 380 if (*(struct ifnet **)(mtag + 1) == ifp) { 381 log(LOG_NOTICE, 382 "gif_output: loop detected on %s\n", 383 (*(struct ifnet **)(mtag + 1))->if_xname); 384 m_freem(m); 385 error = EIO; /* is there better errno? */ 386 goto end; 387 } 388 mtag = m_tag_locate(m, MTAG_GIF, MTAG_GIF_CALLED, mtag); 389 gif_called++; 390 } 391 if (gif_called > max_gif_nesting) { 392 log(LOG_NOTICE, 393 "gif_output: recursively called too many times(%d)\n", 394 gif_called); 395 m_freem(m); 396 error = EIO; /* is there better errno? */ 397 goto end; 398 } 399 mtag = m_tag_alloc(MTAG_GIF, MTAG_GIF_CALLED, sizeof(struct ifnet *), 400 M_NOWAIT); 401 if (mtag == NULL) { 402 m_freem(m); 403 error = ENOMEM; 404 goto end; 405 } 406 *(struct ifnet **)(mtag + 1) = ifp; 407 m_tag_prepend(m, mtag); 408 409 m->m_flags &= ~(M_BCAST|M_MCAST); 410 411 GIF_LOCK(sc); 412 413 if (!(ifp->if_flags & IFF_UP) || 414 sc->gif_psrc == NULL || sc->gif_pdst == NULL) { 415 GIF_UNLOCK(sc); 416 m_freem(m); 417 error = ENETDOWN; 418 goto end; 419 } 420 421 /* BPF writes need to be handled specially. */ 422 if (dst->sa_family == AF_UNSPEC) { 423 bcopy(dst->sa_data, &af, sizeof(af)); 424 dst->sa_family = af; 425 } 426 427 af = dst->sa_family; 428 if (ifp->if_bpf) { 429 bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m); 430 } 431 ifp->if_opackets++; 432 ifp->if_obytes += m->m_pkthdr.len; 433 434 /* override to IPPROTO_ETHERIP for bridged traffic */ 435 if (ifp->if_bridge) 436 af = AF_LINK; 437 438 /* inner AF-specific encapsulation */ 439 440 /* XXX should we check if our outer source is legal? */ 441 442 /* dispatch to output logic based on outer AF */ 443 switch (sc->gif_psrc->sa_family) { 444#ifdef INET 445 case AF_INET: 446 error = in_gif_output(ifp, af, m); 447 break; 448#endif 449#ifdef INET6 450 case AF_INET6: 451 error = in6_gif_output(ifp, af, m); 452 break; 453#endif 454 default: 455 m_freem(m); 456 error = ENETDOWN; 457 } 458 459 GIF_UNLOCK(sc); 460 end: 461 if (error) 462 ifp->if_oerrors++; 463 return (error); 464} 465 466void 467gif_input(m, af, ifp) 468 struct mbuf *m; 469 int af; 470 struct ifnet *ifp; 471{ 472 int isr, n; 473 struct etherip_header *eip; 474 475 if (ifp == NULL) { 476 /* just in case */ 477 m_freem(m); 478 return; 479 } 480 481 m->m_pkthdr.rcvif = ifp; 482 483#ifdef MAC 484 mac_create_mbuf_from_ifnet(ifp, m); 485#endif 486 487 if (ifp->if_bpf) { 488 u_int32_t af1 = af; 489 bpf_mtap2(ifp->if_bpf, &af1, sizeof(af1), m); 490 } 491 492 if (ng_gif_input_p != NULL) { 493 (*ng_gif_input_p)(ifp, &m, af); 494 if (m == NULL) 495 return; 496 } 497 498 /* 499 * Put the packet to the network layer input queue according to the 500 * specified address family. 501 * Note: older versions of gif_input directly called network layer 502 * input functions, e.g. ip6_input, here. We changed the policy to 503 * prevent too many recursive calls of such input functions, which 504 * might cause kernel panic. But the change may introduce another 505 * problem; if the input queue is full, packets are discarded. 506 * The kernel stack overflow really happened, and we believed 507 * queue-full rarely occurs, so we changed the policy. 508 */ 509 switch (af) { 510#ifdef INET 511 case AF_INET: 512 isr = NETISR_IP; 513 break; 514#endif 515#ifdef INET6 516 case AF_INET6: 517 isr = NETISR_IPV6; 518 break; 519#endif 520 case AF_LINK: 521 n = sizeof(struct etherip_header) + sizeof(struct ether_header); 522 if (n > m->m_len) { 523 m = m_pullup(m, n); 524 if (m == NULL) { 525 ifp->if_ierrors++; 526 return; 527 } 528 } 529 530 eip = mtod(m, struct etherip_header *); 531 if (eip->eip_ver != 532 (ETHERIP_VERSION & ETHERIP_VER_VERS_MASK)) { 533 /* discard unknown versions */ 534 m_freem(m); 535 return; 536 } 537 m_adj(m, sizeof(struct etherip_header)); 538 539 m->m_flags &= ~(M_BCAST|M_MCAST); 540 m->m_pkthdr.rcvif = ifp; 541 542 if (ifp->if_bridge) 543 BRIDGE_INPUT(ifp, m); 544 545 if (m != NULL) 546 m_freem(m); 547 return; 548 549 default: 550 if (ng_gif_input_orphan_p != NULL) 551 (*ng_gif_input_orphan_p)(ifp, m, af); 552 else 553 m_freem(m); 554 return; 555 } 556 557 ifp->if_ipackets++; 558 ifp->if_ibytes += m->m_pkthdr.len; 559 netisr_dispatch(isr, m); 560} 561 562/* XXX how should we handle IPv6 scope on SIOC[GS]IFPHYADDR? */ 563int 564gif_ioctl(ifp, cmd, data) 565 struct ifnet *ifp; 566 u_long cmd; 567 caddr_t data; 568{ 569 struct gif_softc *sc = ifp->if_softc; 570 struct ifreq *ifr = (struct ifreq*)data; 571 int error = 0, size; 572 struct sockaddr *dst, *src; 573#ifdef SIOCSIFMTU /* xxx */ 574 u_long mtu; 575#endif 576 577 switch (cmd) { 578 case SIOCSIFADDR: 579 ifp->if_flags |= IFF_UP; 580 break; 581 582 case SIOCSIFDSTADDR: 583 break; 584 585 case SIOCADDMULTI: 586 case SIOCDELMULTI: 587 break; 588 589#ifdef SIOCSIFMTU /* xxx */ 590 case SIOCGIFMTU: 591 break; 592 593 case SIOCSIFMTU: 594 mtu = ifr->ifr_mtu; 595 if (mtu < GIF_MTU_MIN || mtu > GIF_MTU_MAX) 596 return (EINVAL); 597 ifp->if_mtu = mtu; 598 break; 599#endif /* SIOCSIFMTU */ 600 601#ifdef INET 602 case SIOCSIFPHYADDR: 603#endif 604#ifdef INET6 605 case SIOCSIFPHYADDR_IN6: 606#endif /* INET6 */ 607 case SIOCSLIFPHYADDR: 608 switch (cmd) { 609#ifdef INET 610 case SIOCSIFPHYADDR: 611 src = (struct sockaddr *) 612 &(((struct in_aliasreq *)data)->ifra_addr); 613 dst = (struct sockaddr *) 614 &(((struct in_aliasreq *)data)->ifra_dstaddr); 615 break; 616#endif 617#ifdef INET6 618 case SIOCSIFPHYADDR_IN6: 619 src = (struct sockaddr *) 620 &(((struct in6_aliasreq *)data)->ifra_addr); 621 dst = (struct sockaddr *) 622 &(((struct in6_aliasreq *)data)->ifra_dstaddr); 623 break; 624#endif 625 case SIOCSLIFPHYADDR: 626 src = (struct sockaddr *) 627 &(((struct if_laddrreq *)data)->addr); 628 dst = (struct sockaddr *) 629 &(((struct if_laddrreq *)data)->dstaddr); 630 break; 631 default: 632 return EINVAL; 633 } 634 635 /* sa_family must be equal */ 636 if (src->sa_family != dst->sa_family) 637 return EINVAL; 638 639 /* validate sa_len */ 640 switch (src->sa_family) { 641#ifdef INET 642 case AF_INET: 643 if (src->sa_len != sizeof(struct sockaddr_in)) 644 return EINVAL; 645 break; 646#endif 647#ifdef INET6 648 case AF_INET6: 649 if (src->sa_len != sizeof(struct sockaddr_in6)) 650 return EINVAL; 651 break; 652#endif 653 default: 654 return EAFNOSUPPORT; 655 } 656 switch (dst->sa_family) { 657#ifdef INET 658 case AF_INET: 659 if (dst->sa_len != sizeof(struct sockaddr_in)) 660 return EINVAL; 661 break; 662#endif 663#ifdef INET6 664 case AF_INET6: 665 if (dst->sa_len != sizeof(struct sockaddr_in6)) 666 return EINVAL; 667 break; 668#endif 669 default: 670 return EAFNOSUPPORT; 671 } 672 673 /* check sa_family looks sane for the cmd */ 674 switch (cmd) { 675 case SIOCSIFPHYADDR: 676 if (src->sa_family == AF_INET) 677 break; 678 return EAFNOSUPPORT; 679#ifdef INET6 680 case SIOCSIFPHYADDR_IN6: 681 if (src->sa_family == AF_INET6) 682 break; 683 return EAFNOSUPPORT; 684#endif /* INET6 */ 685 case SIOCSLIFPHYADDR: 686 /* checks done in the above */ 687 break; 688 } 689 690 error = gif_set_tunnel(GIF2IFP(sc), src, dst); 691 break; 692 693#ifdef SIOCDIFPHYADDR 694 case SIOCDIFPHYADDR: 695 gif_delete_tunnel(GIF2IFP(sc)); 696 break; 697#endif 698 699 case SIOCGIFPSRCADDR: 700#ifdef INET6 701 case SIOCGIFPSRCADDR_IN6: 702#endif /* INET6 */ 703 if (sc->gif_psrc == NULL) { 704 error = EADDRNOTAVAIL; 705 goto bad; 706 } 707 src = sc->gif_psrc; 708 switch (cmd) { 709#ifdef INET 710 case SIOCGIFPSRCADDR: 711 dst = &ifr->ifr_addr; 712 size = sizeof(ifr->ifr_addr); 713 break; 714#endif /* INET */ 715#ifdef INET6 716 case SIOCGIFPSRCADDR_IN6: 717 dst = (struct sockaddr *) 718 &(((struct in6_ifreq *)data)->ifr_addr); 719 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 720 break; 721#endif /* INET6 */ 722 default: 723 error = EADDRNOTAVAIL; 724 goto bad; 725 } 726 if (src->sa_len > size) 727 return EINVAL; 728 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 729#ifdef INET6 730 if (dst->sa_family == AF_INET6) { 731 error = sa6_recoverscope((struct sockaddr_in6 *)dst); 732 if (error != 0) 733 return (error); 734 } 735#endif 736 break; 737 738 case SIOCGIFPDSTADDR: 739#ifdef INET6 740 case SIOCGIFPDSTADDR_IN6: 741#endif /* INET6 */ 742 if (sc->gif_pdst == NULL) { 743 error = EADDRNOTAVAIL; 744 goto bad; 745 } 746 src = sc->gif_pdst; 747 switch (cmd) { 748#ifdef INET 749 case SIOCGIFPDSTADDR: 750 dst = &ifr->ifr_addr; 751 size = sizeof(ifr->ifr_addr); 752 break; 753#endif /* INET */ 754#ifdef INET6 755 case SIOCGIFPDSTADDR_IN6: 756 dst = (struct sockaddr *) 757 &(((struct in6_ifreq *)data)->ifr_addr); 758 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 759 break; 760#endif /* INET6 */ 761 default: 762 error = EADDRNOTAVAIL; 763 goto bad; 764 } 765 if (src->sa_len > size) 766 return EINVAL; 767 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 768#ifdef INET6 769 if (dst->sa_family == AF_INET6) { 770 error = sa6_recoverscope((struct sockaddr_in6 *)dst); 771 if (error != 0) 772 return (error); 773 } 774#endif 775 break; 776 777 case SIOCGLIFPHYADDR: 778 if (sc->gif_psrc == NULL || sc->gif_pdst == NULL) { 779 error = EADDRNOTAVAIL; 780 goto bad; 781 } 782 783 /* copy src */ 784 src = sc->gif_psrc; 785 dst = (struct sockaddr *) 786 &(((struct if_laddrreq *)data)->addr); 787 size = sizeof(((struct if_laddrreq *)data)->addr); 788 if (src->sa_len > size) 789 return EINVAL; 790 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 791 792 /* copy dst */ 793 src = sc->gif_pdst; 794 dst = (struct sockaddr *) 795 &(((struct if_laddrreq *)data)->dstaddr); 796 size = sizeof(((struct if_laddrreq *)data)->dstaddr); 797 if (src->sa_len > size) 798 return EINVAL; 799 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 800 break; 801 802 case SIOCSIFFLAGS: 803 /* if_ioctl() takes care of it */ 804 break; 805 806 default: 807 error = EINVAL; 808 break; 809 } 810 bad: 811 return error; 812} 813 814/* 815 * XXXRW: There's a general event-ordering issue here: the code to check 816 * if a given tunnel is already present happens before we perform a 817 * potentially blocking setup of the tunnel. This code needs to be 818 * re-ordered so that the check and replacement can be atomic using 819 * a mutex. 820 */ 821int 822gif_set_tunnel(ifp, src, dst) 823 struct ifnet *ifp; 824 struct sockaddr *src; 825 struct sockaddr *dst; 826{ 827 struct gif_softc *sc = ifp->if_softc; 828 struct gif_softc *sc2; 829 struct sockaddr *osrc, *odst, *sa; 830 int error = 0; 831 832 mtx_lock(&gif_mtx); 833 LIST_FOREACH(sc2, &gif_softc_list, gif_list) { 834 if (sc2 == sc) 835 continue; 836 if (!sc2->gif_pdst || !sc2->gif_psrc) 837 continue; 838 if (sc2->gif_pdst->sa_family != dst->sa_family || 839 sc2->gif_pdst->sa_len != dst->sa_len || 840 sc2->gif_psrc->sa_family != src->sa_family || 841 sc2->gif_psrc->sa_len != src->sa_len) 842 continue; 843 844 /* 845 * Disallow parallel tunnels unless instructed 846 * otherwise. 847 */ 848 if (!parallel_tunnels && 849 bcmp(sc2->gif_pdst, dst, dst->sa_len) == 0 && 850 bcmp(sc2->gif_psrc, src, src->sa_len) == 0) { 851 error = EADDRNOTAVAIL; 852 mtx_unlock(&gif_mtx); 853 goto bad; 854 } 855 856 /* XXX both end must be valid? (I mean, not 0.0.0.0) */ 857 } 858 mtx_unlock(&gif_mtx); 859 860 /* XXX we can detach from both, but be polite just in case */ 861 if (sc->gif_psrc) 862 switch (sc->gif_psrc->sa_family) { 863#ifdef INET 864 case AF_INET: 865 (void)in_gif_detach(sc); 866 break; 867#endif 868#ifdef INET6 869 case AF_INET6: 870 (void)in6_gif_detach(sc); 871 break; 872#endif 873 } 874 875 osrc = sc->gif_psrc; 876 sa = (struct sockaddr *)malloc(src->sa_len, M_IFADDR, M_WAITOK); 877 bcopy((caddr_t)src, (caddr_t)sa, src->sa_len); 878 sc->gif_psrc = sa; 879 880 odst = sc->gif_pdst; 881 sa = (struct sockaddr *)malloc(dst->sa_len, M_IFADDR, M_WAITOK); 882 bcopy((caddr_t)dst, (caddr_t)sa, dst->sa_len); 883 sc->gif_pdst = sa; 884 885 switch (sc->gif_psrc->sa_family) { 886#ifdef INET 887 case AF_INET: 888 error = in_gif_attach(sc); 889 break; 890#endif 891#ifdef INET6 892 case AF_INET6: 893 /* 894 * Check validity of the scope zone ID of the addresses, and 895 * convert it into the kernel internal form if necessary. 896 */ 897 error = sa6_embedscope((struct sockaddr_in6 *)sc->gif_psrc, 0); 898 if (error != 0) 899 break; 900 error = sa6_embedscope((struct sockaddr_in6 *)sc->gif_pdst, 0); 901 if (error != 0) 902 break; 903 error = in6_gif_attach(sc); 904 break; 905#endif 906 } 907 if (error) { 908 /* rollback */ 909 free((caddr_t)sc->gif_psrc, M_IFADDR); 910 free((caddr_t)sc->gif_pdst, M_IFADDR); 911 sc->gif_psrc = osrc; 912 sc->gif_pdst = odst; 913 goto bad; 914 } 915 916 if (osrc) 917 free((caddr_t)osrc, M_IFADDR); 918 if (odst) 919 free((caddr_t)odst, M_IFADDR); 920 921 if (sc->gif_psrc && sc->gif_pdst) 922 ifp->if_drv_flags |= IFF_DRV_RUNNING; 923 else 924 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 925 926 return 0; 927 928 bad: 929 if (sc->gif_psrc && sc->gif_pdst) 930 ifp->if_drv_flags |= IFF_DRV_RUNNING; 931 else 932 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 933 934 return error; 935} 936 937void 938gif_delete_tunnel(ifp) 939 struct ifnet *ifp; 940{ 941 struct gif_softc *sc = ifp->if_softc; 942 943 if (sc->gif_psrc) { 944 free((caddr_t)sc->gif_psrc, M_IFADDR); 945 sc->gif_psrc = NULL; 946 } 947 if (sc->gif_pdst) { 948 free((caddr_t)sc->gif_pdst, M_IFADDR); 949 sc->gif_pdst = NULL; 950 } 951 /* it is safe to detach from both */ 952#ifdef INET 953 (void)in_gif_detach(sc); 954#endif 955#ifdef INET6 956 (void)in6_gif_detach(sc); 957#endif 958 959 if (sc->gif_psrc && sc->gif_pdst) 960 ifp->if_drv_flags |= IFF_DRV_RUNNING; 961 else 962 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 963} 964