1 /* $FreeBSD$ */ 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 */ 94 static struct mtx gif_mtx; 95 static MALLOC_DEFINE(M_GIF, "gif", "Generic Tunnel Interface"); 96 static LIST_HEAD(, gif_softc) gif_softc_list; 97 98 void (*ng_gif_input_p)(struct ifnet *ifp, struct mbuf **mp, int af); 99 void (*ng_gif_input_orphan_p)(struct ifnet *ifp, struct mbuf *m, int af); 100 void (*ng_gif_attach_p)(struct ifnet *ifp); 101 void (*ng_gif_detach_p)(struct ifnet *ifp); 102 103 static void gif_start(struct ifnet *); 104 static int gif_clone_create(struct if_clone *, int, caddr_t); 105 static void gif_clone_destroy(struct ifnet *); 106 107 IFC_SIMPLE_DECLARE(gif, 0); 108 109 static int gifmodevent(module_t, int, void *); 110 111 SYSCTL_DECL(_net_link); 112 SYSCTL_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 125 static int max_gif_nesting = MAX_GIF_NEST; 126 SYSCTL_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 135 static int parallel_tunnels = 1; 136 #else 137 static int parallel_tunnels = 0; 138 #endif 139 SYSCTL_INT(_net_link_gif, OID_AUTO, parallel_tunnels, CTLFLAG_RW, 140 ¶llel_tunnels, 0, "Allow parallel tunnels?"); 141 142 static int 143 gif_clone_create(ifc, unit, params) 144 struct if_clone *ifc; 145 int unit; 146 caddr_t params; 147 { 148 struct gif_softc *sc; 149 150 sc = malloc(sizeof(struct gif_softc), M_GIF, M_WAITOK | M_ZERO); 151 GIF2IFP(sc) = if_alloc(IFT_GIF); 152 if (GIF2IFP(sc) == NULL) { 153 free(sc, M_GIF); 154 return (ENOSPC); 155 } 156 157 GIF_LOCK_INIT(sc); 158 159 GIF2IFP(sc)->if_softc = sc; 160 if_initname(GIF2IFP(sc), ifc->ifc_name, unit); 161 162 sc->encap_cookie4 = sc->encap_cookie6 = NULL; 163 164 GIF2IFP(sc)->if_addrlen = 0; 165 GIF2IFP(sc)->if_mtu = GIF_MTU; 166 GIF2IFP(sc)->if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 167 #if 0 168 /* turn off ingress filter */ 169 GIF2IFP(sc)->if_flags |= IFF_LINK2; 170 #endif 171 GIF2IFP(sc)->if_ioctl = gif_ioctl; 172 GIF2IFP(sc)->if_start = gif_start; 173 GIF2IFP(sc)->if_output = gif_output; 174 GIF2IFP(sc)->if_snd.ifq_maxlen = IFQ_MAXLEN; 175 if_attach(GIF2IFP(sc)); 176 bpfattach(GIF2IFP(sc), DLT_NULL, sizeof(u_int32_t)); 177 if (ng_gif_attach_p != NULL) 178 (*ng_gif_attach_p)(GIF2IFP(sc)); 179 180 mtx_lock(&gif_mtx); 181 LIST_INSERT_HEAD(&gif_softc_list, sc, gif_list); 182 mtx_unlock(&gif_mtx); 183 184 return (0); 185 } 186 187 static void 188 gif_clone_destroy(ifp) 189 struct ifnet *ifp; 190 { 191 int err; 192 struct gif_softc *sc = ifp->if_softc; 193 194 mtx_lock(&gif_mtx); 195 LIST_REMOVE(sc, gif_list); 196 mtx_unlock(&gif_mtx); 197 198 gif_delete_tunnel(ifp); 199 #ifdef INET6 200 if (sc->encap_cookie6 != NULL) { 201 err = encap_detach(sc->encap_cookie6); 202 KASSERT(err == 0, ("Unexpected error detaching encap_cookie6")); 203 } 204 #endif 205 #ifdef INET 206 if (sc->encap_cookie4 != NULL) { 207 err = encap_detach(sc->encap_cookie4); 208 KASSERT(err == 0, ("Unexpected error detaching encap_cookie4")); 209 } 210 #endif 211 212 if (ng_gif_detach_p != NULL) 213 (*ng_gif_detach_p)(ifp); 214 bpfdetach(ifp); 215 if_detach(ifp); 216 if_free(ifp); 217 218 GIF_LOCK_DESTROY(sc); 219 220 free(sc, M_GIF); 221 } 222 223 static int 224 gifmodevent(mod, type, data) 225 module_t mod; 226 int type; 227 void *data; 228 { 229 230 switch (type) { 231 case MOD_LOAD: 232 mtx_init(&gif_mtx, "gif_mtx", NULL, MTX_DEF); 233 LIST_INIT(&gif_softc_list); 234 if_clone_attach(&gif_cloner); 235 236 #ifdef INET6 237 ip6_gif_hlim = GIF_HLIM; 238 #endif 239 240 break; 241 case MOD_UNLOAD: 242 if_clone_detach(&gif_cloner); 243 mtx_destroy(&gif_mtx); 244 #ifdef INET6 245 ip6_gif_hlim = 0; 246 #endif 247 break; 248 default: 249 return EOPNOTSUPP; 250 } 251 return 0; 252 } 253 254 static moduledata_t gif_mod = { 255 "if_gif", 256 gifmodevent, 257 0 258 }; 259 260 DECLARE_MODULE(if_gif, gif_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 261 MODULE_VERSION(if_gif, 1); 262 263 int 264 gif_encapcheck(m, off, proto, arg) 265 const struct mbuf *m; 266 int off; 267 int proto; 268 void *arg; 269 { 270 struct ip ip; 271 struct gif_softc *sc; 272 273 sc = (struct gif_softc *)arg; 274 if (sc == NULL) 275 return 0; 276 277 if ((GIF2IFP(sc)->if_flags & IFF_UP) == 0) 278 return 0; 279 280 /* no physical address */ 281 if (!sc->gif_psrc || !sc->gif_pdst) 282 return 0; 283 284 switch (proto) { 285 #ifdef INET 286 case IPPROTO_IPV4: 287 break; 288 #endif 289 #ifdef INET6 290 case IPPROTO_IPV6: 291 break; 292 #endif 293 case IPPROTO_ETHERIP: 294 break; 295 296 default: 297 return 0; 298 } 299 300 /* Bail on short packets */ 301 if (m->m_pkthdr.len < sizeof(ip)) 302 return 0; 303 304 m_copydata(m, 0, sizeof(ip), (caddr_t)&ip); 305 306 switch (ip.ip_v) { 307 #ifdef INET 308 case 4: 309 if (sc->gif_psrc->sa_family != AF_INET || 310 sc->gif_pdst->sa_family != AF_INET) 311 return 0; 312 return gif_encapcheck4(m, off, proto, arg); 313 #endif 314 #ifdef INET6 315 case 6: 316 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) 317 return 0; 318 if (sc->gif_psrc->sa_family != AF_INET6 || 319 sc->gif_pdst->sa_family != AF_INET6) 320 return 0; 321 return gif_encapcheck6(m, off, proto, arg); 322 #endif 323 default: 324 return 0; 325 } 326 } 327 328 static void 329 gif_start(struct ifnet *ifp) 330 { 331 struct gif_softc *sc; 332 struct mbuf *m; 333 334 sc = ifp->if_softc; 335 336 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 337 for (;;) { 338 IFQ_DEQUEUE(&ifp->if_snd, m); 339 if (m == 0) 340 break; 341 342 gif_output(ifp, m, sc->gif_pdst, NULL); 343 344 } 345 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 346 347 return; 348 } 349 350 int 351 gif_output(ifp, m, dst, rt) 352 struct ifnet *ifp; 353 struct mbuf *m; 354 struct sockaddr *dst; 355 struct rtentry *rt; /* added in net2 */ 356 { 357 struct gif_softc *sc = ifp->if_softc; 358 struct m_tag *mtag; 359 int error = 0; 360 int gif_called; 361 u_int32_t af; 362 363 #ifdef MAC 364 error = mac_check_ifnet_transmit(ifp, m); 365 if (error) { 366 m_freem(m); 367 goto end; 368 } 369 #endif 370 371 /* 372 * gif may cause infinite recursion calls when misconfigured. 373 * We'll prevent this by detecting loops. 374 * 375 * High nesting level may cause stack exhaustion. 376 * We'll prevent this by introducing upper limit. 377 */ 378 gif_called = 1; 379 mtag = m_tag_locate(m, MTAG_GIF, MTAG_GIF_CALLED, NULL); 380 while (mtag != NULL) { 381 if (*(struct ifnet **)(mtag + 1) == ifp) { 382 log(LOG_NOTICE, 383 "gif_output: loop detected on %s\n", 384 (*(struct ifnet **)(mtag + 1))->if_xname); 385 m_freem(m); 386 error = EIO; /* is there better errno? */ 387 goto end; 388 } 389 mtag = m_tag_locate(m, MTAG_GIF, MTAG_GIF_CALLED, mtag); 390 gif_called++; 391 } 392 if (gif_called > max_gif_nesting) { 393 log(LOG_NOTICE, 394 "gif_output: recursively called too many times(%d)\n", 395 gif_called); 396 m_freem(m); 397 error = EIO; /* is there better errno? */ 398 goto end; 399 } 400 mtag = m_tag_alloc(MTAG_GIF, MTAG_GIF_CALLED, sizeof(struct ifnet *), 401 M_NOWAIT); 402 if (mtag == NULL) { 403 m_freem(m); 404 error = ENOMEM; 405 goto end; 406 } 407 *(struct ifnet **)(mtag + 1) = ifp; 408 m_tag_prepend(m, mtag); 409 410 m->m_flags &= ~(M_BCAST|M_MCAST); 411 412 GIF_LOCK(sc); 413 414 if (!(ifp->if_flags & IFF_UP) || 415 sc->gif_psrc == NULL || sc->gif_pdst == NULL) { 416 GIF_UNLOCK(sc); 417 m_freem(m); 418 error = ENETDOWN; 419 goto end; 420 } 421 422 /* BPF writes need to be handled specially. */ 423 if (dst->sa_family == AF_UNSPEC) { 424 bcopy(dst->sa_data, &af, sizeof(af)); 425 dst->sa_family = af; 426 } 427 428 af = dst->sa_family; 429 BPF_MTAP2(ifp, &af, sizeof(af), m); 430 ifp->if_opackets++; 431 ifp->if_obytes += m->m_pkthdr.len; 432 433 /* override to IPPROTO_ETHERIP for bridged traffic */ 434 if (ifp->if_bridge) 435 af = AF_LINK; 436 437 /* inner AF-specific encapsulation */ 438 439 /* XXX should we check if our outer source is legal? */ 440 441 /* dispatch to output logic based on outer AF */ 442 switch (sc->gif_psrc->sa_family) { 443 #ifdef INET 444 case AF_INET: 445 error = in_gif_output(ifp, af, m); 446 break; 447 #endif 448 #ifdef INET6 449 case AF_INET6: 450 error = in6_gif_output(ifp, af, m); 451 break; 452 #endif 453 default: 454 m_freem(m); 455 error = ENETDOWN; 456 } 457 458 GIF_UNLOCK(sc); 459 end: 460 if (error) 461 ifp->if_oerrors++; 462 return (error); 463 } 464 465 void 466 gif_input(m, af, ifp) 467 struct mbuf *m; 468 int af; 469 struct ifnet *ifp; 470 { 471 int isr, n; 472 struct etherip_header *eip; 473 474 if (ifp == NULL) { 475 /* just in case */ 476 m_freem(m); 477 return; 478 } 479 480 m->m_pkthdr.rcvif = ifp; 481 482 #ifdef MAC 483 mac_create_mbuf_from_ifnet(ifp, m); 484 #endif 485 486 if (bpf_peers_present(ifp->if_bpf)) { 487 u_int32_t af1 = af; 488 bpf_mtap2(ifp->if_bpf, &af1, sizeof(af1), m); 489 } 490 491 if (ng_gif_input_p != NULL) { 492 (*ng_gif_input_p)(ifp, &m, af); 493 if (m == NULL) 494 return; 495 } 496 497 /* 498 * Put the packet to the network layer input queue according to the 499 * specified address family. 500 * Note: older versions of gif_input directly called network layer 501 * input functions, e.g. ip6_input, here. We changed the policy to 502 * prevent too many recursive calls of such input functions, which 503 * might cause kernel panic. But the change may introduce another 504 * problem; if the input queue is full, packets are discarded. 505 * The kernel stack overflow really happened, and we believed 506 * queue-full rarely occurs, so we changed the policy. 507 */ 508 switch (af) { 509 #ifdef INET 510 case AF_INET: 511 isr = NETISR_IP; 512 break; 513 #endif 514 #ifdef INET6 515 case AF_INET6: 516 isr = NETISR_IPV6; 517 break; 518 #endif 519 case AF_LINK: 520 n = sizeof(struct etherip_header) + sizeof(struct ether_header); 521 if (n > m->m_len) { 522 m = m_pullup(m, n); 523 if (m == NULL) { 524 ifp->if_ierrors++; 525 return; 526 } 527 } 528 529 eip = mtod(m, struct etherip_header *); 530 if (eip->eip_ver != 531 (ETHERIP_VERSION & ETHERIP_VER_VERS_MASK)) { 532 /* discard unknown versions */ 533 m_freem(m); 534 return; 535 } 536 m_adj(m, sizeof(struct etherip_header)); 537 538 m->m_flags &= ~(M_BCAST|M_MCAST); 539 m->m_pkthdr.rcvif = ifp; 540 541 if (ifp->if_bridge) 542 BRIDGE_INPUT(ifp, m); 543 544 if (m != NULL) 545 m_freem(m); 546 return; 547 548 default: 549 if (ng_gif_input_orphan_p != NULL) 550 (*ng_gif_input_orphan_p)(ifp, m, af); 551 else 552 m_freem(m); 553 return; 554 } 555 556 ifp->if_ipackets++; 557 ifp->if_ibytes += m->m_pkthdr.len; 558 netisr_dispatch(isr, m); 559 } 560 561 /* XXX how should we handle IPv6 scope on SIOC[GS]IFPHYADDR? */ 562 int 563 gif_ioctl(ifp, cmd, data) 564 struct ifnet *ifp; 565 u_long cmd; 566 caddr_t data; 567 { 568 struct gif_softc *sc = ifp->if_softc; 569 struct ifreq *ifr = (struct ifreq*)data; 570 int error = 0, size; 571 struct sockaddr *dst, *src; 572 #ifdef SIOCSIFMTU /* xxx */ 573 u_long mtu; 574 #endif 575 576 switch (cmd) { 577 case SIOCSIFADDR: 578 ifp->if_flags |= IFF_UP; 579 break; 580 581 case SIOCSIFDSTADDR: 582 break; 583 584 case SIOCADDMULTI: 585 case SIOCDELMULTI: 586 break; 587 588 #ifdef SIOCSIFMTU /* xxx */ 589 case SIOCGIFMTU: 590 break; 591 592 case SIOCSIFMTU: 593 mtu = ifr->ifr_mtu; 594 if (mtu < GIF_MTU_MIN || mtu > GIF_MTU_MAX) 595 return (EINVAL); 596 ifp->if_mtu = mtu; 597 break; 598 #endif /* SIOCSIFMTU */ 599 600 #ifdef INET 601 case SIOCSIFPHYADDR: 602 #endif 603 #ifdef INET6 604 case SIOCSIFPHYADDR_IN6: 605 #endif /* INET6 */ 606 case SIOCSLIFPHYADDR: 607 switch (cmd) { 608 #ifdef INET 609 case SIOCSIFPHYADDR: 610 src = (struct sockaddr *) 611 &(((struct in_aliasreq *)data)->ifra_addr); 612 dst = (struct sockaddr *) 613 &(((struct in_aliasreq *)data)->ifra_dstaddr); 614 break; 615 #endif 616 #ifdef INET6 617 case SIOCSIFPHYADDR_IN6: 618 src = (struct sockaddr *) 619 &(((struct in6_aliasreq *)data)->ifra_addr); 620 dst = (struct sockaddr *) 621 &(((struct in6_aliasreq *)data)->ifra_dstaddr); 622 break; 623 #endif 624 case SIOCSLIFPHYADDR: 625 src = (struct sockaddr *) 626 &(((struct if_laddrreq *)data)->addr); 627 dst = (struct sockaddr *) 628 &(((struct if_laddrreq *)data)->dstaddr); 629 break; 630 default: 631 return EINVAL; 632 } 633 634 /* sa_family must be equal */ 635 if (src->sa_family != dst->sa_family) 636 return EINVAL; 637 638 /* validate sa_len */ 639 switch (src->sa_family) { 640 #ifdef INET 641 case AF_INET: 642 if (src->sa_len != sizeof(struct sockaddr_in)) 643 return EINVAL; 644 break; 645 #endif 646 #ifdef INET6 647 case AF_INET6: 648 if (src->sa_len != sizeof(struct sockaddr_in6)) 649 return EINVAL; 650 break; 651 #endif 652 default: 653 return EAFNOSUPPORT; 654 } 655 switch (dst->sa_family) { 656 #ifdef INET 657 case AF_INET: 658 if (dst->sa_len != sizeof(struct sockaddr_in)) 659 return EINVAL; 660 break; 661 #endif 662 #ifdef INET6 663 case AF_INET6: 664 if (dst->sa_len != sizeof(struct sockaddr_in6)) 665 return EINVAL; 666 break; 667 #endif 668 default: 669 return EAFNOSUPPORT; 670 } 671 672 /* check sa_family looks sane for the cmd */ 673 switch (cmd) { 674 case SIOCSIFPHYADDR: 675 if (src->sa_family == AF_INET) 676 break; 677 return EAFNOSUPPORT; 678 #ifdef INET6 679 case SIOCSIFPHYADDR_IN6: 680 if (src->sa_family == AF_INET6) 681 break; 682 return EAFNOSUPPORT; 683 #endif /* INET6 */ 684 case SIOCSLIFPHYADDR: 685 /* checks done in the above */ 686 break; 687 } 688 689 error = gif_set_tunnel(GIF2IFP(sc), src, dst); 690 break; 691 692 #ifdef SIOCDIFPHYADDR 693 case SIOCDIFPHYADDR: 694 gif_delete_tunnel(GIF2IFP(sc)); 695 break; 696 #endif 697 698 case SIOCGIFPSRCADDR: 699 #ifdef INET6 700 case SIOCGIFPSRCADDR_IN6: 701 #endif /* INET6 */ 702 if (sc->gif_psrc == NULL) { 703 error = EADDRNOTAVAIL; 704 goto bad; 705 } 706 src = sc->gif_psrc; 707 switch (cmd) { 708 #ifdef INET 709 case SIOCGIFPSRCADDR: 710 dst = &ifr->ifr_addr; 711 size = sizeof(ifr->ifr_addr); 712 break; 713 #endif /* INET */ 714 #ifdef INET6 715 case SIOCGIFPSRCADDR_IN6: 716 dst = (struct sockaddr *) 717 &(((struct in6_ifreq *)data)->ifr_addr); 718 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 719 break; 720 #endif /* INET6 */ 721 default: 722 error = EADDRNOTAVAIL; 723 goto bad; 724 } 725 if (src->sa_len > size) 726 return EINVAL; 727 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 728 #ifdef INET6 729 if (dst->sa_family == AF_INET6) { 730 error = sa6_recoverscope((struct sockaddr_in6 *)dst); 731 if (error != 0) 732 return (error); 733 } 734 #endif 735 break; 736 737 case SIOCGIFPDSTADDR: 738 #ifdef INET6 739 case SIOCGIFPDSTADDR_IN6: 740 #endif /* INET6 */ 741 if (sc->gif_pdst == NULL) { 742 error = EADDRNOTAVAIL; 743 goto bad; 744 } 745 src = sc->gif_pdst; 746 switch (cmd) { 747 #ifdef INET 748 case SIOCGIFPDSTADDR: 749 dst = &ifr->ifr_addr; 750 size = sizeof(ifr->ifr_addr); 751 break; 752 #endif /* INET */ 753 #ifdef INET6 754 case SIOCGIFPDSTADDR_IN6: 755 dst = (struct sockaddr *) 756 &(((struct in6_ifreq *)data)->ifr_addr); 757 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 758 break; 759 #endif /* INET6 */ 760 default: 761 error = EADDRNOTAVAIL; 762 goto bad; 763 } 764 if (src->sa_len > size) 765 return EINVAL; 766 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 767 #ifdef INET6 768 if (dst->sa_family == AF_INET6) { 769 error = sa6_recoverscope((struct sockaddr_in6 *)dst); 770 if (error != 0) 771 return (error); 772 } 773 #endif 774 break; 775 776 case SIOCGLIFPHYADDR: 777 if (sc->gif_psrc == NULL || sc->gif_pdst == NULL) { 778 error = EADDRNOTAVAIL; 779 goto bad; 780 } 781 782 /* copy src */ 783 src = sc->gif_psrc; 784 dst = (struct sockaddr *) 785 &(((struct if_laddrreq *)data)->addr); 786 size = sizeof(((struct if_laddrreq *)data)->addr); 787 if (src->sa_len > size) 788 return EINVAL; 789 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 790 791 /* copy dst */ 792 src = sc->gif_pdst; 793 dst = (struct sockaddr *) 794 &(((struct if_laddrreq *)data)->dstaddr); 795 size = sizeof(((struct if_laddrreq *)data)->dstaddr); 796 if (src->sa_len > size) 797 return EINVAL; 798 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 799 break; 800 801 case SIOCSIFFLAGS: 802 /* if_ioctl() takes care of it */ 803 break; 804 805 default: 806 error = EINVAL; 807 break; 808 } 809 bad: 810 return error; 811 } 812 813 /* 814 * XXXRW: There's a general event-ordering issue here: the code to check 815 * if a given tunnel is already present happens before we perform a 816 * potentially blocking setup of the tunnel. This code needs to be 817 * re-ordered so that the check and replacement can be atomic using 818 * a mutex. 819 */ 820 int 821 gif_set_tunnel(ifp, src, dst) 822 struct ifnet *ifp; 823 struct sockaddr *src; 824 struct sockaddr *dst; 825 { 826 struct gif_softc *sc = ifp->if_softc; 827 struct gif_softc *sc2; 828 struct sockaddr *osrc, *odst, *sa; 829 int error = 0; 830 831 mtx_lock(&gif_mtx); 832 LIST_FOREACH(sc2, &gif_softc_list, gif_list) { 833 if (sc2 == sc) 834 continue; 835 if (!sc2->gif_pdst || !sc2->gif_psrc) 836 continue; 837 if (sc2->gif_pdst->sa_family != dst->sa_family || 838 sc2->gif_pdst->sa_len != dst->sa_len || 839 sc2->gif_psrc->sa_family != src->sa_family || 840 sc2->gif_psrc->sa_len != src->sa_len) 841 continue; 842 843 /* 844 * Disallow parallel tunnels unless instructed 845 * otherwise. 846 */ 847 if (!parallel_tunnels && 848 bcmp(sc2->gif_pdst, dst, dst->sa_len) == 0 && 849 bcmp(sc2->gif_psrc, src, src->sa_len) == 0) { 850 error = EADDRNOTAVAIL; 851 mtx_unlock(&gif_mtx); 852 goto bad; 853 } 854 855 /* XXX both end must be valid? (I mean, not 0.0.0.0) */ 856 } 857 mtx_unlock(&gif_mtx); 858 859 /* XXX we can detach from both, but be polite just in case */ 860 if (sc->gif_psrc) 861 switch (sc->gif_psrc->sa_family) { 862 #ifdef INET 863 case AF_INET: 864 (void)in_gif_detach(sc); 865 break; 866 #endif 867 #ifdef INET6 868 case AF_INET6: 869 (void)in6_gif_detach(sc); 870 break; 871 #endif 872 } 873 874 osrc = sc->gif_psrc; 875 sa = (struct sockaddr *)malloc(src->sa_len, M_IFADDR, M_WAITOK); 876 bcopy((caddr_t)src, (caddr_t)sa, src->sa_len); 877 sc->gif_psrc = sa; 878 879 odst = sc->gif_pdst; 880 sa = (struct sockaddr *)malloc(dst->sa_len, M_IFADDR, M_WAITOK); 881 bcopy((caddr_t)dst, (caddr_t)sa, dst->sa_len); 882 sc->gif_pdst = sa; 883 884 switch (sc->gif_psrc->sa_family) { 885 #ifdef INET 886 case AF_INET: 887 error = in_gif_attach(sc); 888 break; 889 #endif 890 #ifdef INET6 891 case AF_INET6: 892 /* 893 * Check validity of the scope zone ID of the addresses, and 894 * convert it into the kernel internal form if necessary. 895 */ 896 error = sa6_embedscope((struct sockaddr_in6 *)sc->gif_psrc, 0); 897 if (error != 0) 898 break; 899 error = sa6_embedscope((struct sockaddr_in6 *)sc->gif_pdst, 0); 900 if (error != 0) 901 break; 902 error = in6_gif_attach(sc); 903 break; 904 #endif 905 } 906 if (error) { 907 /* rollback */ 908 free((caddr_t)sc->gif_psrc, M_IFADDR); 909 free((caddr_t)sc->gif_pdst, M_IFADDR); 910 sc->gif_psrc = osrc; 911 sc->gif_pdst = odst; 912 goto bad; 913 } 914 915 if (osrc) 916 free((caddr_t)osrc, M_IFADDR); 917 if (odst) 918 free((caddr_t)odst, M_IFADDR); 919 920 bad: 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 error; 927 } 928 929 void 930 gif_delete_tunnel(ifp) 931 struct ifnet *ifp; 932 { 933 struct gif_softc *sc = ifp->if_softc; 934 935 if (sc->gif_psrc) { 936 free((caddr_t)sc->gif_psrc, M_IFADDR); 937 sc->gif_psrc = NULL; 938 } 939 if (sc->gif_pdst) { 940 free((caddr_t)sc->gif_pdst, M_IFADDR); 941 sc->gif_pdst = NULL; 942 } 943 /* it is safe to detach from both */ 944 #ifdef INET 945 (void)in_gif_detach(sc); 946 #endif 947 #ifdef INET6 948 (void)in6_gif_detach(sc); 949 #endif 950 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 951 } 952