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/in6_gif.h> 78 #include <netinet6/ip6protosw.h> 79 #endif /* INET6 */ 80 81 #include <netinet/ip_encap.h> 82 #include <net/if_gif.h> 83 84 #include <net/net_osdep.h> 85 86 #define GIFNAME "gif" 87 88 /* 89 * gif_mtx protects the global gif_softc_list. 90 * XXX: Per-softc locking is still required. 91 */ 92 static struct mtx gif_mtx; 93 static MALLOC_DEFINE(M_GIF, "gif", "Generic Tunnel Interface"); 94 static LIST_HEAD(, gif_softc) gif_softc_list; 95 96 void (*ng_gif_input_p)(struct ifnet *ifp, struct mbuf **mp, int af); 97 void (*ng_gif_input_orphan_p)(struct ifnet *ifp, struct mbuf *m, int af); 98 void (*ng_gif_attach_p)(struct ifnet *ifp); 99 void (*ng_gif_detach_p)(struct ifnet *ifp); 100 101 static int gif_clone_create(struct if_clone *, int); 102 static void gif_clone_destroy(struct ifnet *); 103 104 IFC_SIMPLE_DECLARE(gif, 0); 105 106 static int gifmodevent(module_t, int, void *); 107 108 SYSCTL_DECL(_net_link); 109 SYSCTL_NODE(_net_link, IFT_GIF, gif, CTLFLAG_RW, 0, 110 "Generic Tunnel Interface"); 111 #ifndef MAX_GIF_NEST 112 /* 113 * This macro controls the default upper limitation on nesting of gif tunnels. 114 * Since, setting a large value to this macro with a careless configuration 115 * may introduce system crash, we don't allow any nestings by default. 116 * If you need to configure nested gif tunnels, you can define this macro 117 * in your kernel configuration file. However, if you do so, please be 118 * careful to configure the tunnels so that it won't make a loop. 119 */ 120 #define MAX_GIF_NEST 1 121 #endif 122 static int max_gif_nesting = MAX_GIF_NEST; 123 SYSCTL_INT(_net_link_gif, OID_AUTO, max_nesting, CTLFLAG_RW, 124 &max_gif_nesting, 0, "Max nested tunnels"); 125 126 /* 127 * By default, we disallow creation of multiple tunnels between the same 128 * pair of addresses. Some applications require this functionality so 129 * we allow control over this check here. 130 */ 131 #ifdef XBONEHACK 132 static int parallel_tunnels = 1; 133 #else 134 static int parallel_tunnels = 0; 135 #endif 136 SYSCTL_INT(_net_link_gif, OID_AUTO, parallel_tunnels, CTLFLAG_RW, 137 ¶llel_tunnels, 0, "Allow parallel tunnels?"); 138 139 static int 140 gif_clone_create(ifc, unit) 141 struct if_clone *ifc; 142 int unit; 143 { 144 struct gif_softc *sc; 145 146 sc = malloc(sizeof(struct gif_softc), M_GIF, M_WAITOK | M_ZERO); 147 148 sc->gif_if.if_softc = sc; 149 if_initname(&sc->gif_if, ifc->ifc_name, unit); 150 151 gifattach0(sc); 152 153 mtx_lock(&gif_mtx); 154 LIST_INSERT_HEAD(&gif_softc_list, sc, gif_list); 155 mtx_unlock(&gif_mtx); 156 return (0); 157 } 158 159 void 160 gifattach0(sc) 161 struct gif_softc *sc; 162 { 163 164 sc->encap_cookie4 = sc->encap_cookie6 = NULL; 165 166 sc->gif_if.if_addrlen = 0; 167 sc->gif_if.if_mtu = GIF_MTU; 168 sc->gif_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 169 #if 0 170 /* turn off ingress filter */ 171 sc->gif_if.if_flags |= IFF_LINK2; 172 #endif 173 sc->gif_if.if_ioctl = gif_ioctl; 174 sc->gif_if.if_output = gif_output; 175 sc->gif_if.if_type = IFT_GIF; 176 sc->gif_if.if_snd.ifq_maxlen = IFQ_MAXLEN; 177 if_attach(&sc->gif_if); 178 bpfattach(&sc->gif_if, DLT_NULL, sizeof(u_int)); 179 if (ng_gif_attach_p != NULL) 180 (*ng_gif_attach_p)(&sc->gif_if); 181 } 182 183 static void 184 gif_destroy(struct gif_softc *sc) 185 { 186 struct ifnet *ifp = &sc->gif_if; 187 int err; 188 189 gif_delete_tunnel(ifp); 190 #ifdef INET6 191 if (sc->encap_cookie6 != NULL) { 192 err = encap_detach(sc->encap_cookie6); 193 KASSERT(err == 0, ("Unexpected error detaching encap_cookie6")); 194 } 195 #endif 196 #ifdef INET 197 if (sc->encap_cookie4 != NULL) { 198 err = encap_detach(sc->encap_cookie4); 199 KASSERT(err == 0, ("Unexpected error detaching encap_cookie4")); 200 } 201 #endif 202 203 if (ng_gif_detach_p != NULL) 204 (*ng_gif_detach_p)(ifp); 205 bpfdetach(ifp); 206 if_detach(ifp); 207 208 free(sc, M_GIF); 209 } 210 211 static void 212 gif_clone_destroy(ifp) 213 struct ifnet *ifp; 214 { 215 struct gif_softc *sc = ifp->if_softc; 216 217 mtx_lock(&gif_mtx); 218 LIST_REMOVE(sc, gif_list); 219 mtx_unlock(&gif_mtx); 220 gif_destroy(sc); 221 } 222 223 static int 224 gifmodevent(mod, type, data) 225 module_t mod; 226 int type; 227 void *data; 228 { 229 struct gif_softc *sc; 230 231 switch (type) { 232 case MOD_LOAD: 233 mtx_init(&gif_mtx, "gif_mtx", NULL, MTX_DEF); 234 LIST_INIT(&gif_softc_list); 235 if_clone_attach(&gif_cloner); 236 237 #ifdef INET6 238 ip6_gif_hlim = GIF_HLIM; 239 #endif 240 241 break; 242 case MOD_UNLOAD: 243 if_clone_detach(&gif_cloner); 244 245 mtx_lock(&gif_mtx); 246 while ((sc = LIST_FIRST(&gif_softc_list)) != NULL) { 247 LIST_REMOVE(sc, gif_list); 248 mtx_unlock(&gif_mtx); 249 gif_destroy(sc); 250 mtx_lock(&gif_mtx); 251 } 252 mtx_unlock(&gif_mtx); 253 mtx_destroy(&gif_mtx); 254 #ifdef INET6 255 ip6_gif_hlim = 0; 256 #endif 257 break; 258 default: 259 return EOPNOTSUPP; 260 } 261 return 0; 262 } 263 264 static moduledata_t gif_mod = { 265 "if_gif", 266 gifmodevent, 267 0 268 }; 269 270 DECLARE_MODULE(if_gif, gif_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 271 MODULE_VERSION(if_gif, 1); 272 273 int 274 gif_encapcheck(m, off, proto, arg) 275 const struct mbuf *m; 276 int off; 277 int proto; 278 void *arg; 279 { 280 struct ip ip; 281 struct gif_softc *sc; 282 283 sc = (struct gif_softc *)arg; 284 if (sc == NULL) 285 return 0; 286 287 if ((sc->gif_if.if_flags & IFF_UP) == 0) 288 return 0; 289 290 /* no physical address */ 291 if (!sc->gif_psrc || !sc->gif_pdst) 292 return 0; 293 294 switch (proto) { 295 #ifdef INET 296 case IPPROTO_IPV4: 297 break; 298 #endif 299 #ifdef INET6 300 case IPPROTO_IPV6: 301 break; 302 #endif 303 default: 304 return 0; 305 } 306 307 /* Bail on short packets */ 308 if (m->m_pkthdr.len < sizeof(ip)) 309 return 0; 310 311 m_copydata(m, 0, sizeof(ip), (caddr_t)&ip); 312 313 switch (ip.ip_v) { 314 #ifdef INET 315 case 4: 316 if (sc->gif_psrc->sa_family != AF_INET || 317 sc->gif_pdst->sa_family != AF_INET) 318 return 0; 319 return gif_encapcheck4(m, off, proto, arg); 320 #endif 321 #ifdef INET6 322 case 6: 323 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) 324 return 0; 325 if (sc->gif_psrc->sa_family != AF_INET6 || 326 sc->gif_pdst->sa_family != AF_INET6) 327 return 0; 328 return gif_encapcheck6(m, off, proto, arg); 329 #endif 330 default: 331 return 0; 332 } 333 } 334 335 int 336 gif_output(ifp, m, dst, rt) 337 struct ifnet *ifp; 338 struct mbuf *m; 339 struct sockaddr *dst; 340 struct rtentry *rt; /* added in net2 */ 341 { 342 struct gif_softc *sc = (struct gif_softc*)ifp; 343 struct m_tag *mtag; 344 int error = 0; 345 int gif_called; 346 347 #ifdef MAC 348 error = mac_check_ifnet_transmit(ifp, m); 349 if (error) { 350 m_freem(m); 351 goto end; 352 } 353 #endif 354 355 /* 356 * gif may cause infinite recursion calls when misconfigured. 357 * We'll prevent this by detecting loops. 358 * 359 * High nesting level may cause stack exhaustion. 360 * We'll prevent this by introducing upper limit. 361 */ 362 gif_called = 1; 363 mtag = m_tag_locate(m, MTAG_GIF, MTAG_GIF_CALLED, NULL); 364 while (mtag != NULL) { 365 if (*(struct ifnet **)(mtag + 1) == ifp) { 366 log(LOG_NOTICE, 367 "gif_output: loop detected on %s\n", 368 (*(struct ifnet **)(mtag + 1))->if_xname); 369 m_freem(m); 370 error = EIO; /* is there better errno? */ 371 goto end; 372 } 373 mtag = m_tag_locate(m, MTAG_GIF, MTAG_GIF_CALLED, mtag); 374 gif_called++; 375 } 376 if (gif_called > max_gif_nesting) { 377 log(LOG_NOTICE, 378 "gif_output: recursively called too many times(%d)\n", 379 gif_called); 380 m_freem(m); 381 error = EIO; /* is there better errno? */ 382 goto end; 383 } 384 mtag = m_tag_alloc(MTAG_GIF, MTAG_GIF_CALLED, sizeof(struct ifnet *), 385 M_NOWAIT); 386 if (mtag == NULL) { 387 m_freem(m); 388 error = ENOMEM; 389 goto end; 390 } 391 *(struct ifnet **)(mtag + 1) = ifp; 392 m_tag_prepend(m, mtag); 393 394 m->m_flags &= ~(M_BCAST|M_MCAST); 395 if (!(ifp->if_flags & IFF_UP) || 396 sc->gif_psrc == NULL || sc->gif_pdst == NULL) { 397 m_freem(m); 398 error = ENETDOWN; 399 goto end; 400 } 401 402 if (ifp->if_bpf) { 403 u_int32_t af = dst->sa_family; 404 bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m); 405 } 406 ifp->if_opackets++; 407 ifp->if_obytes += m->m_pkthdr.len; 408 409 /* inner AF-specific encapsulation */ 410 411 /* XXX should we check if our outer source is legal? */ 412 413 /* dispatch to output logic based on outer AF */ 414 switch (sc->gif_psrc->sa_family) { 415 #ifdef INET 416 case AF_INET: 417 error = in_gif_output(ifp, dst->sa_family, m); 418 break; 419 #endif 420 #ifdef INET6 421 case AF_INET6: 422 error = in6_gif_output(ifp, dst->sa_family, m); 423 break; 424 #endif 425 default: 426 m_freem(m); 427 error = ENETDOWN; 428 goto end; 429 } 430 431 end: 432 if (error) 433 ifp->if_oerrors++; 434 return error; 435 } 436 437 void 438 gif_input(m, af, ifp) 439 struct mbuf *m; 440 int af; 441 struct ifnet *ifp; 442 { 443 int isr; 444 445 if (ifp == NULL) { 446 /* just in case */ 447 m_freem(m); 448 return; 449 } 450 451 m->m_pkthdr.rcvif = ifp; 452 453 #ifdef MAC 454 mac_create_mbuf_from_ifnet(ifp, m); 455 #endif 456 457 if (ifp->if_bpf) { 458 u_int32_t af1 = af; 459 bpf_mtap2(ifp->if_bpf, &af1, sizeof(af1), m); 460 } 461 462 if (ng_gif_input_p != NULL) { 463 (*ng_gif_input_p)(ifp, &m, af); 464 if (m == NULL) 465 return; 466 } 467 468 /* 469 * Put the packet to the network layer input queue according to the 470 * specified address family. 471 * Note: older versions of gif_input directly called network layer 472 * input functions, e.g. ip6_input, here. We changed the policy to 473 * prevent too many recursive calls of such input functions, which 474 * might cause kernel panic. But the change may introduce another 475 * problem; if the input queue is full, packets are discarded. 476 * The kernel stack overflow really happened, and we believed 477 * queue-full rarely occurs, so we changed the policy. 478 */ 479 switch (af) { 480 #ifdef INET 481 case AF_INET: 482 isr = NETISR_IP; 483 break; 484 #endif 485 #ifdef INET6 486 case AF_INET6: 487 isr = NETISR_IPV6; 488 break; 489 #endif 490 default: 491 if (ng_gif_input_orphan_p != NULL) 492 (*ng_gif_input_orphan_p)(ifp, m, af); 493 else 494 m_freem(m); 495 return; 496 } 497 498 ifp->if_ipackets++; 499 ifp->if_ibytes += m->m_pkthdr.len; 500 netisr_dispatch(isr, m); 501 } 502 503 /* XXX how should we handle IPv6 scope on SIOC[GS]IFPHYADDR? */ 504 int 505 gif_ioctl(ifp, cmd, data) 506 struct ifnet *ifp; 507 u_long cmd; 508 caddr_t data; 509 { 510 struct gif_softc *sc = (struct gif_softc*)ifp; 511 struct ifreq *ifr = (struct ifreq*)data; 512 int error = 0, size; 513 struct sockaddr *dst, *src; 514 #ifdef SIOCSIFMTU /* xxx */ 515 u_long mtu; 516 #endif 517 518 switch (cmd) { 519 case SIOCSIFADDR: 520 ifp->if_flags |= IFF_UP; 521 break; 522 523 case SIOCSIFDSTADDR: 524 break; 525 526 case SIOCADDMULTI: 527 case SIOCDELMULTI: 528 break; 529 530 #ifdef SIOCSIFMTU /* xxx */ 531 case SIOCGIFMTU: 532 break; 533 534 case SIOCSIFMTU: 535 mtu = ifr->ifr_mtu; 536 if (mtu < GIF_MTU_MIN || mtu > GIF_MTU_MAX) 537 return (EINVAL); 538 ifp->if_mtu = mtu; 539 break; 540 #endif /* SIOCSIFMTU */ 541 542 #ifdef INET 543 case SIOCSIFPHYADDR: 544 #endif 545 #ifdef INET6 546 case SIOCSIFPHYADDR_IN6: 547 #endif /* INET6 */ 548 case SIOCSLIFPHYADDR: 549 switch (cmd) { 550 #ifdef INET 551 case SIOCSIFPHYADDR: 552 src = (struct sockaddr *) 553 &(((struct in_aliasreq *)data)->ifra_addr); 554 dst = (struct sockaddr *) 555 &(((struct in_aliasreq *)data)->ifra_dstaddr); 556 break; 557 #endif 558 #ifdef INET6 559 case SIOCSIFPHYADDR_IN6: 560 src = (struct sockaddr *) 561 &(((struct in6_aliasreq *)data)->ifra_addr); 562 dst = (struct sockaddr *) 563 &(((struct in6_aliasreq *)data)->ifra_dstaddr); 564 break; 565 #endif 566 case SIOCSLIFPHYADDR: 567 src = (struct sockaddr *) 568 &(((struct if_laddrreq *)data)->addr); 569 dst = (struct sockaddr *) 570 &(((struct if_laddrreq *)data)->dstaddr); 571 break; 572 default: 573 return EINVAL; 574 } 575 576 /* sa_family must be equal */ 577 if (src->sa_family != dst->sa_family) 578 return EINVAL; 579 580 /* validate sa_len */ 581 switch (src->sa_family) { 582 #ifdef INET 583 case AF_INET: 584 if (src->sa_len != sizeof(struct sockaddr_in)) 585 return EINVAL; 586 break; 587 #endif 588 #ifdef INET6 589 case AF_INET6: 590 if (src->sa_len != sizeof(struct sockaddr_in6)) 591 return EINVAL; 592 break; 593 #endif 594 default: 595 return EAFNOSUPPORT; 596 } 597 switch (dst->sa_family) { 598 #ifdef INET 599 case AF_INET: 600 if (dst->sa_len != sizeof(struct sockaddr_in)) 601 return EINVAL; 602 break; 603 #endif 604 #ifdef INET6 605 case AF_INET6: 606 if (dst->sa_len != sizeof(struct sockaddr_in6)) 607 return EINVAL; 608 break; 609 #endif 610 default: 611 return EAFNOSUPPORT; 612 } 613 614 /* check sa_family looks sane for the cmd */ 615 switch (cmd) { 616 case SIOCSIFPHYADDR: 617 if (src->sa_family == AF_INET) 618 break; 619 return EAFNOSUPPORT; 620 #ifdef INET6 621 case SIOCSIFPHYADDR_IN6: 622 if (src->sa_family == AF_INET6) 623 break; 624 return EAFNOSUPPORT; 625 #endif /* INET6 */ 626 case SIOCSLIFPHYADDR: 627 /* checks done in the above */ 628 break; 629 } 630 631 error = gif_set_tunnel(&sc->gif_if, src, dst); 632 break; 633 634 #ifdef SIOCDIFPHYADDR 635 case SIOCDIFPHYADDR: 636 gif_delete_tunnel(&sc->gif_if); 637 break; 638 #endif 639 640 case SIOCGIFPSRCADDR: 641 #ifdef INET6 642 case SIOCGIFPSRCADDR_IN6: 643 #endif /* INET6 */ 644 if (sc->gif_psrc == NULL) { 645 error = EADDRNOTAVAIL; 646 goto bad; 647 } 648 src = sc->gif_psrc; 649 switch (cmd) { 650 #ifdef INET 651 case SIOCGIFPSRCADDR: 652 dst = &ifr->ifr_addr; 653 size = sizeof(ifr->ifr_addr); 654 break; 655 #endif /* INET */ 656 #ifdef INET6 657 case SIOCGIFPSRCADDR_IN6: 658 dst = (struct sockaddr *) 659 &(((struct in6_ifreq *)data)->ifr_addr); 660 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 661 break; 662 #endif /* INET6 */ 663 default: 664 error = EADDRNOTAVAIL; 665 goto bad; 666 } 667 if (src->sa_len > size) 668 return EINVAL; 669 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 670 break; 671 672 case SIOCGIFPDSTADDR: 673 #ifdef INET6 674 case SIOCGIFPDSTADDR_IN6: 675 #endif /* INET6 */ 676 if (sc->gif_pdst == NULL) { 677 error = EADDRNOTAVAIL; 678 goto bad; 679 } 680 src = sc->gif_pdst; 681 switch (cmd) { 682 #ifdef INET 683 case SIOCGIFPDSTADDR: 684 dst = &ifr->ifr_addr; 685 size = sizeof(ifr->ifr_addr); 686 break; 687 #endif /* INET */ 688 #ifdef INET6 689 case SIOCGIFPDSTADDR_IN6: 690 dst = (struct sockaddr *) 691 &(((struct in6_ifreq *)data)->ifr_addr); 692 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 693 break; 694 #endif /* INET6 */ 695 default: 696 error = EADDRNOTAVAIL; 697 goto bad; 698 } 699 if (src->sa_len > size) 700 return EINVAL; 701 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 702 break; 703 704 case SIOCGLIFPHYADDR: 705 if (sc->gif_psrc == NULL || sc->gif_pdst == NULL) { 706 error = EADDRNOTAVAIL; 707 goto bad; 708 } 709 710 /* copy src */ 711 src = sc->gif_psrc; 712 dst = (struct sockaddr *) 713 &(((struct if_laddrreq *)data)->addr); 714 size = sizeof(((struct if_laddrreq *)data)->addr); 715 if (src->sa_len > size) 716 return EINVAL; 717 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 718 719 /* copy dst */ 720 src = sc->gif_pdst; 721 dst = (struct sockaddr *) 722 &(((struct if_laddrreq *)data)->dstaddr); 723 size = sizeof(((struct if_laddrreq *)data)->dstaddr); 724 if (src->sa_len > size) 725 return EINVAL; 726 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 727 break; 728 729 case SIOCSIFFLAGS: 730 /* if_ioctl() takes care of it */ 731 break; 732 733 default: 734 error = EINVAL; 735 break; 736 } 737 bad: 738 return error; 739 } 740 741 /* 742 * XXXRW: There's a general event-ordering issue here: the code to check 743 * if a given tunnel is already present happens before we perform a 744 * potentially blocking setup of the tunnel. This code needs to be 745 * re-ordered so that the check and replacement can be atomic using 746 * a mutex. 747 */ 748 int 749 gif_set_tunnel(ifp, src, dst) 750 struct ifnet *ifp; 751 struct sockaddr *src; 752 struct sockaddr *dst; 753 { 754 struct gif_softc *sc = (struct gif_softc *)ifp; 755 struct gif_softc *sc2; 756 struct sockaddr *osrc, *odst, *sa; 757 int s; 758 int error = 0; 759 760 s = splnet(); 761 762 mtx_lock(&gif_mtx); 763 LIST_FOREACH(sc2, &gif_softc_list, gif_list) { 764 if (sc2 == sc) 765 continue; 766 if (!sc2->gif_pdst || !sc2->gif_psrc) 767 continue; 768 if (sc2->gif_pdst->sa_family != dst->sa_family || 769 sc2->gif_pdst->sa_len != dst->sa_len || 770 sc2->gif_psrc->sa_family != src->sa_family || 771 sc2->gif_psrc->sa_len != src->sa_len) 772 continue; 773 774 /* 775 * Disallow parallel tunnels unless instructed 776 * otherwise. 777 */ 778 if (!parallel_tunnels && 779 bcmp(sc2->gif_pdst, dst, dst->sa_len) == 0 && 780 bcmp(sc2->gif_psrc, src, src->sa_len) == 0) { 781 error = EADDRNOTAVAIL; 782 mtx_unlock(&gif_mtx); 783 goto bad; 784 } 785 786 /* XXX both end must be valid? (I mean, not 0.0.0.0) */ 787 } 788 mtx_unlock(&gif_mtx); 789 790 /* XXX we can detach from both, but be polite just in case */ 791 if (sc->gif_psrc) 792 switch (sc->gif_psrc->sa_family) { 793 #ifdef INET 794 case AF_INET: 795 (void)in_gif_detach(sc); 796 break; 797 #endif 798 #ifdef INET6 799 case AF_INET6: 800 (void)in6_gif_detach(sc); 801 break; 802 #endif 803 } 804 805 osrc = sc->gif_psrc; 806 sa = (struct sockaddr *)malloc(src->sa_len, M_IFADDR, M_WAITOK); 807 bcopy((caddr_t)src, (caddr_t)sa, src->sa_len); 808 sc->gif_psrc = sa; 809 810 odst = sc->gif_pdst; 811 sa = (struct sockaddr *)malloc(dst->sa_len, M_IFADDR, M_WAITOK); 812 bcopy((caddr_t)dst, (caddr_t)sa, dst->sa_len); 813 sc->gif_pdst = sa; 814 815 switch (sc->gif_psrc->sa_family) { 816 #ifdef INET 817 case AF_INET: 818 error = in_gif_attach(sc); 819 break; 820 #endif 821 #ifdef INET6 822 case AF_INET6: 823 error = in6_gif_attach(sc); 824 break; 825 #endif 826 } 827 if (error) { 828 /* rollback */ 829 free((caddr_t)sc->gif_psrc, M_IFADDR); 830 free((caddr_t)sc->gif_pdst, M_IFADDR); 831 sc->gif_psrc = osrc; 832 sc->gif_pdst = odst; 833 goto bad; 834 } 835 836 if (osrc) 837 free((caddr_t)osrc, M_IFADDR); 838 if (odst) 839 free((caddr_t)odst, M_IFADDR); 840 841 if (sc->gif_psrc && sc->gif_pdst) 842 ifp->if_flags |= IFF_RUNNING; 843 else 844 ifp->if_flags &= ~IFF_RUNNING; 845 splx(s); 846 847 return 0; 848 849 bad: 850 if (sc->gif_psrc && sc->gif_pdst) 851 ifp->if_flags |= IFF_RUNNING; 852 else 853 ifp->if_flags &= ~IFF_RUNNING; 854 splx(s); 855 856 return error; 857 } 858 859 void 860 gif_delete_tunnel(ifp) 861 struct ifnet *ifp; 862 { 863 struct gif_softc *sc = (struct gif_softc *)ifp; 864 int s; 865 866 s = splnet(); 867 868 if (sc->gif_psrc) { 869 free((caddr_t)sc->gif_psrc, M_IFADDR); 870 sc->gif_psrc = NULL; 871 } 872 if (sc->gif_pdst) { 873 free((caddr_t)sc->gif_pdst, M_IFADDR); 874 sc->gif_pdst = NULL; 875 } 876 /* it is safe to detach from both */ 877 #ifdef INET 878 (void)in_gif_detach(sc); 879 #endif 880 #ifdef INET6 881 (void)in6_gif_detach(sc); 882 #endif 883 884 if (sc->gif_psrc && sc->gif_pdst) 885 ifp->if_flags |= IFF_RUNNING; 886 else 887 ifp->if_flags &= ~IFF_RUNNING; 888 splx(s); 889 } 890