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/if_gif.h> 84 85 #include <net/net_osdep.h> 86 87 #define GIFNAME "gif" 88 89 /* 90 * gif_mtx protects the global gif_softc_list. 91 * XXX: Per-softc locking is still required. 92 */ 93 static struct mtx gif_mtx; 94 static MALLOC_DEFINE(M_GIF, "gif", "Generic Tunnel Interface"); 95 static LIST_HEAD(, gif_softc) gif_softc_list; 96 97 void (*ng_gif_input_p)(struct ifnet *ifp, struct mbuf **mp, int af); 98 void (*ng_gif_input_orphan_p)(struct ifnet *ifp, struct mbuf *m, int af); 99 void (*ng_gif_attach_p)(struct ifnet *ifp); 100 void (*ng_gif_detach_p)(struct ifnet *ifp); 101 102 static int gif_clone_create(struct if_clone *, int); 103 static void gif_clone_destroy(struct ifnet *); 104 105 IFC_SIMPLE_DECLARE(gif, 0); 106 107 static int gifmodevent(module_t, int, void *); 108 109 SYSCTL_DECL(_net_link); 110 SYSCTL_NODE(_net_link, IFT_GIF, gif, CTLFLAG_RW, 0, 111 "Generic Tunnel Interface"); 112 #ifndef MAX_GIF_NEST 113 /* 114 * This macro controls the default upper limitation on nesting of gif tunnels. 115 * Since, setting a large value to this macro with a careless configuration 116 * may introduce system crash, we don't allow any nestings by default. 117 * If you need to configure nested gif tunnels, you can define this macro 118 * in your kernel configuration file. However, if you do so, please be 119 * careful to configure the tunnels so that it won't make a loop. 120 */ 121 #define MAX_GIF_NEST 1 122 #endif 123 static int max_gif_nesting = MAX_GIF_NEST; 124 SYSCTL_INT(_net_link_gif, OID_AUTO, max_nesting, CTLFLAG_RW, 125 &max_gif_nesting, 0, "Max nested tunnels"); 126 127 /* 128 * By default, we disallow creation of multiple tunnels between the same 129 * pair of addresses. Some applications require this functionality so 130 * we allow control over this check here. 131 */ 132 #ifdef XBONEHACK 133 static int parallel_tunnels = 1; 134 #else 135 static int parallel_tunnels = 0; 136 #endif 137 SYSCTL_INT(_net_link_gif, OID_AUTO, parallel_tunnels, CTLFLAG_RW, 138 ¶llel_tunnels, 0, "Allow parallel tunnels?"); 139 140 static int 141 gif_clone_create(ifc, unit) 142 struct if_clone *ifc; 143 int unit; 144 { 145 struct gif_softc *sc; 146 147 sc = malloc(sizeof(struct gif_softc), M_GIF, M_WAITOK | M_ZERO); 148 GIF2IFP(sc) = if_alloc(IFT_GIF); 149 if (GIF2IFP(sc) == NULL) { 150 free(sc, M_GIF); 151 return (ENOSPC); 152 } 153 154 GIF2IFP(sc)->if_softc = sc; 155 if_initname(GIF2IFP(sc), ifc->ifc_name, unit); 156 157 gifattach0(sc); 158 159 mtx_lock(&gif_mtx); 160 LIST_INSERT_HEAD(&gif_softc_list, sc, gif_list); 161 mtx_unlock(&gif_mtx); 162 return (0); 163 } 164 165 void 166 gifattach0(sc) 167 struct gif_softc *sc; 168 { 169 170 sc->encap_cookie4 = sc->encap_cookie6 = NULL; 171 172 GIF2IFP(sc)->if_addrlen = 0; 173 GIF2IFP(sc)->if_mtu = GIF_MTU; 174 GIF2IFP(sc)->if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 175 #if 0 176 /* turn off ingress filter */ 177 GIF2IFP(sc)->if_flags |= IFF_LINK2; 178 #endif 179 GIF2IFP(sc)->if_ioctl = gif_ioctl; 180 GIF2IFP(sc)->if_output = gif_output; 181 GIF2IFP(sc)->if_snd.ifq_maxlen = IFQ_MAXLEN; 182 if_attach(GIF2IFP(sc)); 183 bpfattach(GIF2IFP(sc), DLT_NULL, sizeof(u_int32_t)); 184 if (ng_gif_attach_p != NULL) 185 (*ng_gif_attach_p)(GIF2IFP(sc)); 186 } 187 188 static void 189 gif_destroy(struct gif_softc *sc) 190 { 191 struct ifnet *ifp = GIF2IFP(sc); 192 int err; 193 194 gif_delete_tunnel(ifp); 195 #ifdef INET6 196 if (sc->encap_cookie6 != NULL) { 197 err = encap_detach(sc->encap_cookie6); 198 KASSERT(err == 0, ("Unexpected error detaching encap_cookie6")); 199 } 200 #endif 201 #ifdef INET 202 if (sc->encap_cookie4 != NULL) { 203 err = encap_detach(sc->encap_cookie4); 204 KASSERT(err == 0, ("Unexpected error detaching encap_cookie4")); 205 } 206 #endif 207 208 if (ng_gif_detach_p != NULL) 209 (*ng_gif_detach_p)(ifp); 210 bpfdetach(ifp); 211 if_detach(ifp); 212 if_free(ifp); 213 214 free(sc, M_GIF); 215 } 216 217 static void 218 gif_clone_destroy(ifp) 219 struct ifnet *ifp; 220 { 221 struct gif_softc *sc = ifp->if_softc; 222 223 mtx_lock(&gif_mtx); 224 LIST_REMOVE(sc, gif_list); 225 mtx_unlock(&gif_mtx); 226 gif_destroy(sc); 227 } 228 229 static int 230 gifmodevent(mod, type, data) 231 module_t mod; 232 int type; 233 void *data; 234 { 235 struct gif_softc *sc; 236 237 switch (type) { 238 case MOD_LOAD: 239 mtx_init(&gif_mtx, "gif_mtx", NULL, MTX_DEF); 240 LIST_INIT(&gif_softc_list); 241 if_clone_attach(&gif_cloner); 242 243 #ifdef INET6 244 ip6_gif_hlim = GIF_HLIM; 245 #endif 246 247 break; 248 case MOD_UNLOAD: 249 if_clone_detach(&gif_cloner); 250 251 mtx_lock(&gif_mtx); 252 while ((sc = LIST_FIRST(&gif_softc_list)) != NULL) { 253 LIST_REMOVE(sc, gif_list); 254 mtx_unlock(&gif_mtx); 255 gif_destroy(sc); 256 mtx_lock(&gif_mtx); 257 } 258 mtx_unlock(&gif_mtx); 259 mtx_destroy(&gif_mtx); 260 #ifdef INET6 261 ip6_gif_hlim = 0; 262 #endif 263 break; 264 default: 265 return EOPNOTSUPP; 266 } 267 return 0; 268 } 269 270 static moduledata_t gif_mod = { 271 "if_gif", 272 gifmodevent, 273 0 274 }; 275 276 DECLARE_MODULE(if_gif, gif_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 277 MODULE_VERSION(if_gif, 1); 278 279 int 280 gif_encapcheck(m, off, proto, arg) 281 const struct mbuf *m; 282 int off; 283 int proto; 284 void *arg; 285 { 286 struct ip ip; 287 struct gif_softc *sc; 288 289 sc = (struct gif_softc *)arg; 290 if (sc == NULL) 291 return 0; 292 293 if ((GIF2IFP(sc)->if_flags & IFF_UP) == 0) 294 return 0; 295 296 /* no physical address */ 297 if (!sc->gif_psrc || !sc->gif_pdst) 298 return 0; 299 300 switch (proto) { 301 #ifdef INET 302 case IPPROTO_IPV4: 303 break; 304 #endif 305 #ifdef INET6 306 case IPPROTO_IPV6: 307 break; 308 #endif 309 default: 310 return 0; 311 } 312 313 /* Bail on short packets */ 314 if (m->m_pkthdr.len < sizeof(ip)) 315 return 0; 316 317 m_copydata(m, 0, sizeof(ip), (caddr_t)&ip); 318 319 switch (ip.ip_v) { 320 #ifdef INET 321 case 4: 322 if (sc->gif_psrc->sa_family != AF_INET || 323 sc->gif_pdst->sa_family != AF_INET) 324 return 0; 325 return gif_encapcheck4(m, off, proto, arg); 326 #endif 327 #ifdef INET6 328 case 6: 329 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) 330 return 0; 331 if (sc->gif_psrc->sa_family != AF_INET6 || 332 sc->gif_pdst->sa_family != AF_INET6) 333 return 0; 334 return gif_encapcheck6(m, off, proto, arg); 335 #endif 336 default: 337 return 0; 338 } 339 } 340 341 int 342 gif_output(ifp, m, dst, rt) 343 struct ifnet *ifp; 344 struct mbuf *m; 345 struct sockaddr *dst; 346 struct rtentry *rt; /* added in net2 */ 347 { 348 struct gif_softc *sc = ifp->if_softc; 349 struct m_tag *mtag; 350 int error = 0; 351 int gif_called; 352 u_int32_t af; 353 354 #ifdef MAC 355 error = mac_check_ifnet_transmit(ifp, m); 356 if (error) { 357 m_freem(m); 358 goto end; 359 } 360 #endif 361 362 /* 363 * gif may cause infinite recursion calls when misconfigured. 364 * We'll prevent this by detecting loops. 365 * 366 * High nesting level may cause stack exhaustion. 367 * We'll prevent this by introducing upper limit. 368 */ 369 gif_called = 1; 370 mtag = m_tag_locate(m, MTAG_GIF, MTAG_GIF_CALLED, NULL); 371 while (mtag != NULL) { 372 if (*(struct ifnet **)(mtag + 1) == ifp) { 373 log(LOG_NOTICE, 374 "gif_output: loop detected on %s\n", 375 (*(struct ifnet **)(mtag + 1))->if_xname); 376 m_freem(m); 377 error = EIO; /* is there better errno? */ 378 goto end; 379 } 380 mtag = m_tag_locate(m, MTAG_GIF, MTAG_GIF_CALLED, mtag); 381 gif_called++; 382 } 383 if (gif_called > max_gif_nesting) { 384 log(LOG_NOTICE, 385 "gif_output: recursively called too many times(%d)\n", 386 gif_called); 387 m_freem(m); 388 error = EIO; /* is there better errno? */ 389 goto end; 390 } 391 mtag = m_tag_alloc(MTAG_GIF, MTAG_GIF_CALLED, sizeof(struct ifnet *), 392 M_NOWAIT); 393 if (mtag == NULL) { 394 m_freem(m); 395 error = ENOMEM; 396 goto end; 397 } 398 *(struct ifnet **)(mtag + 1) = ifp; 399 m_tag_prepend(m, mtag); 400 401 m->m_flags &= ~(M_BCAST|M_MCAST); 402 if (!(ifp->if_flags & IFF_UP) || 403 sc->gif_psrc == NULL || sc->gif_pdst == NULL) { 404 m_freem(m); 405 error = ENETDOWN; 406 goto end; 407 } 408 409 /* BPF writes need to be handled specially. */ 410 if (dst->sa_family == AF_UNSPEC) { 411 bcopy(dst->sa_data, &af, sizeof(af)); 412 dst->sa_family = af; 413 } 414 415 if (ifp->if_bpf) { 416 af = dst->sa_family; 417 bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m); 418 } 419 ifp->if_opackets++; 420 ifp->if_obytes += m->m_pkthdr.len; 421 422 /* inner AF-specific encapsulation */ 423 424 /* XXX should we check if our outer source is legal? */ 425 426 /* dispatch to output logic based on outer AF */ 427 switch (sc->gif_psrc->sa_family) { 428 #ifdef INET 429 case AF_INET: 430 error = in_gif_output(ifp, dst->sa_family, m); 431 break; 432 #endif 433 #ifdef INET6 434 case AF_INET6: 435 error = in6_gif_output(ifp, dst->sa_family, m); 436 break; 437 #endif 438 default: 439 m_freem(m); 440 error = ENETDOWN; 441 goto end; 442 } 443 444 end: 445 if (error) 446 ifp->if_oerrors++; 447 return error; 448 } 449 450 void 451 gif_input(m, af, ifp) 452 struct mbuf *m; 453 int af; 454 struct ifnet *ifp; 455 { 456 int isr; 457 458 if (ifp == NULL) { 459 /* just in case */ 460 m_freem(m); 461 return; 462 } 463 464 m->m_pkthdr.rcvif = ifp; 465 466 #ifdef MAC 467 mac_create_mbuf_from_ifnet(ifp, m); 468 #endif 469 470 if (ifp->if_bpf) { 471 u_int32_t af1 = af; 472 bpf_mtap2(ifp->if_bpf, &af1, sizeof(af1), m); 473 } 474 475 if (ng_gif_input_p != NULL) { 476 (*ng_gif_input_p)(ifp, &m, af); 477 if (m == NULL) 478 return; 479 } 480 481 /* 482 * Put the packet to the network layer input queue according to the 483 * specified address family. 484 * Note: older versions of gif_input directly called network layer 485 * input functions, e.g. ip6_input, here. We changed the policy to 486 * prevent too many recursive calls of such input functions, which 487 * might cause kernel panic. But the change may introduce another 488 * problem; if the input queue is full, packets are discarded. 489 * The kernel stack overflow really happened, and we believed 490 * queue-full rarely occurs, so we changed the policy. 491 */ 492 switch (af) { 493 #ifdef INET 494 case AF_INET: 495 isr = NETISR_IP; 496 break; 497 #endif 498 #ifdef INET6 499 case AF_INET6: 500 isr = NETISR_IPV6; 501 break; 502 #endif 503 default: 504 if (ng_gif_input_orphan_p != NULL) 505 (*ng_gif_input_orphan_p)(ifp, m, af); 506 else 507 m_freem(m); 508 return; 509 } 510 511 ifp->if_ipackets++; 512 ifp->if_ibytes += m->m_pkthdr.len; 513 netisr_dispatch(isr, m); 514 } 515 516 /* XXX how should we handle IPv6 scope on SIOC[GS]IFPHYADDR? */ 517 int 518 gif_ioctl(ifp, cmd, data) 519 struct ifnet *ifp; 520 u_long cmd; 521 caddr_t data; 522 { 523 struct gif_softc *sc = ifp->if_softc; 524 struct ifreq *ifr = (struct ifreq*)data; 525 int error = 0, size; 526 struct sockaddr *dst, *src; 527 #ifdef SIOCSIFMTU /* xxx */ 528 u_long mtu; 529 #endif 530 531 switch (cmd) { 532 case SIOCSIFADDR: 533 ifp->if_flags |= IFF_UP; 534 break; 535 536 case SIOCSIFDSTADDR: 537 break; 538 539 case SIOCADDMULTI: 540 case SIOCDELMULTI: 541 break; 542 543 #ifdef SIOCSIFMTU /* xxx */ 544 case SIOCGIFMTU: 545 break; 546 547 case SIOCSIFMTU: 548 mtu = ifr->ifr_mtu; 549 if (mtu < GIF_MTU_MIN || mtu > GIF_MTU_MAX) 550 return (EINVAL); 551 ifp->if_mtu = mtu; 552 break; 553 #endif /* SIOCSIFMTU */ 554 555 #ifdef INET 556 case SIOCSIFPHYADDR: 557 #endif 558 #ifdef INET6 559 case SIOCSIFPHYADDR_IN6: 560 #endif /* INET6 */ 561 case SIOCSLIFPHYADDR: 562 switch (cmd) { 563 #ifdef INET 564 case SIOCSIFPHYADDR: 565 src = (struct sockaddr *) 566 &(((struct in_aliasreq *)data)->ifra_addr); 567 dst = (struct sockaddr *) 568 &(((struct in_aliasreq *)data)->ifra_dstaddr); 569 break; 570 #endif 571 #ifdef INET6 572 case SIOCSIFPHYADDR_IN6: 573 src = (struct sockaddr *) 574 &(((struct in6_aliasreq *)data)->ifra_addr); 575 dst = (struct sockaddr *) 576 &(((struct in6_aliasreq *)data)->ifra_dstaddr); 577 break; 578 #endif 579 case SIOCSLIFPHYADDR: 580 src = (struct sockaddr *) 581 &(((struct if_laddrreq *)data)->addr); 582 dst = (struct sockaddr *) 583 &(((struct if_laddrreq *)data)->dstaddr); 584 break; 585 default: 586 return EINVAL; 587 } 588 589 /* sa_family must be equal */ 590 if (src->sa_family != dst->sa_family) 591 return EINVAL; 592 593 /* validate sa_len */ 594 switch (src->sa_family) { 595 #ifdef INET 596 case AF_INET: 597 if (src->sa_len != sizeof(struct sockaddr_in)) 598 return EINVAL; 599 break; 600 #endif 601 #ifdef INET6 602 case AF_INET6: 603 if (src->sa_len != sizeof(struct sockaddr_in6)) 604 return EINVAL; 605 break; 606 #endif 607 default: 608 return EAFNOSUPPORT; 609 } 610 switch (dst->sa_family) { 611 #ifdef INET 612 case AF_INET: 613 if (dst->sa_len != sizeof(struct sockaddr_in)) 614 return EINVAL; 615 break; 616 #endif 617 #ifdef INET6 618 case AF_INET6: 619 if (dst->sa_len != sizeof(struct sockaddr_in6)) 620 return EINVAL; 621 break; 622 #endif 623 default: 624 return EAFNOSUPPORT; 625 } 626 627 /* check sa_family looks sane for the cmd */ 628 switch (cmd) { 629 case SIOCSIFPHYADDR: 630 if (src->sa_family == AF_INET) 631 break; 632 return EAFNOSUPPORT; 633 #ifdef INET6 634 case SIOCSIFPHYADDR_IN6: 635 if (src->sa_family == AF_INET6) 636 break; 637 return EAFNOSUPPORT; 638 #endif /* INET6 */ 639 case SIOCSLIFPHYADDR: 640 /* checks done in the above */ 641 break; 642 } 643 644 error = gif_set_tunnel(GIF2IFP(sc), src, dst); 645 break; 646 647 #ifdef SIOCDIFPHYADDR 648 case SIOCDIFPHYADDR: 649 gif_delete_tunnel(GIF2IFP(sc)); 650 break; 651 #endif 652 653 case SIOCGIFPSRCADDR: 654 #ifdef INET6 655 case SIOCGIFPSRCADDR_IN6: 656 #endif /* INET6 */ 657 if (sc->gif_psrc == NULL) { 658 error = EADDRNOTAVAIL; 659 goto bad; 660 } 661 src = sc->gif_psrc; 662 switch (cmd) { 663 #ifdef INET 664 case SIOCGIFPSRCADDR: 665 dst = &ifr->ifr_addr; 666 size = sizeof(ifr->ifr_addr); 667 break; 668 #endif /* INET */ 669 #ifdef INET6 670 case SIOCGIFPSRCADDR_IN6: 671 dst = (struct sockaddr *) 672 &(((struct in6_ifreq *)data)->ifr_addr); 673 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 674 break; 675 #endif /* INET6 */ 676 default: 677 error = EADDRNOTAVAIL; 678 goto bad; 679 } 680 if (src->sa_len > size) 681 return EINVAL; 682 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 683 #ifdef INET6 684 if (dst->sa_family == AF_INET6) { 685 error = sa6_recoverscope((struct sockaddr_in6 *)dst); 686 if (error != 0) 687 return (error); 688 } 689 #endif 690 break; 691 692 case SIOCGIFPDSTADDR: 693 #ifdef INET6 694 case SIOCGIFPDSTADDR_IN6: 695 #endif /* INET6 */ 696 if (sc->gif_pdst == NULL) { 697 error = EADDRNOTAVAIL; 698 goto bad; 699 } 700 src = sc->gif_pdst; 701 switch (cmd) { 702 #ifdef INET 703 case SIOCGIFPDSTADDR: 704 dst = &ifr->ifr_addr; 705 size = sizeof(ifr->ifr_addr); 706 break; 707 #endif /* INET */ 708 #ifdef INET6 709 case SIOCGIFPDSTADDR_IN6: 710 dst = (struct sockaddr *) 711 &(((struct in6_ifreq *)data)->ifr_addr); 712 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 713 break; 714 #endif /* INET6 */ 715 default: 716 error = EADDRNOTAVAIL; 717 goto bad; 718 } 719 if (src->sa_len > size) 720 return EINVAL; 721 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 722 #ifdef INET6 723 if (dst->sa_family == AF_INET6) { 724 error = sa6_recoverscope((struct sockaddr_in6 *)dst); 725 if (error != 0) 726 return (error); 727 } 728 #endif 729 break; 730 731 case SIOCGLIFPHYADDR: 732 if (sc->gif_psrc == NULL || sc->gif_pdst == NULL) { 733 error = EADDRNOTAVAIL; 734 goto bad; 735 } 736 737 /* copy src */ 738 src = sc->gif_psrc; 739 dst = (struct sockaddr *) 740 &(((struct if_laddrreq *)data)->addr); 741 size = sizeof(((struct if_laddrreq *)data)->addr); 742 if (src->sa_len > size) 743 return EINVAL; 744 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 745 746 /* copy dst */ 747 src = sc->gif_pdst; 748 dst = (struct sockaddr *) 749 &(((struct if_laddrreq *)data)->dstaddr); 750 size = sizeof(((struct if_laddrreq *)data)->dstaddr); 751 if (src->sa_len > size) 752 return EINVAL; 753 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 754 break; 755 756 case SIOCSIFFLAGS: 757 /* if_ioctl() takes care of it */ 758 break; 759 760 default: 761 error = EINVAL; 762 break; 763 } 764 bad: 765 return error; 766 } 767 768 /* 769 * XXXRW: There's a general event-ordering issue here: the code to check 770 * if a given tunnel is already present happens before we perform a 771 * potentially blocking setup of the tunnel. This code needs to be 772 * re-ordered so that the check and replacement can be atomic using 773 * a mutex. 774 */ 775 int 776 gif_set_tunnel(ifp, src, dst) 777 struct ifnet *ifp; 778 struct sockaddr *src; 779 struct sockaddr *dst; 780 { 781 struct gif_softc *sc = ifp->if_softc; 782 struct gif_softc *sc2; 783 struct sockaddr *osrc, *odst, *sa; 784 int s; 785 int error = 0; 786 787 s = splnet(); 788 789 mtx_lock(&gif_mtx); 790 LIST_FOREACH(sc2, &gif_softc_list, gif_list) { 791 if (sc2 == sc) 792 continue; 793 if (!sc2->gif_pdst || !sc2->gif_psrc) 794 continue; 795 if (sc2->gif_pdst->sa_family != dst->sa_family || 796 sc2->gif_pdst->sa_len != dst->sa_len || 797 sc2->gif_psrc->sa_family != src->sa_family || 798 sc2->gif_psrc->sa_len != src->sa_len) 799 continue; 800 801 /* 802 * Disallow parallel tunnels unless instructed 803 * otherwise. 804 */ 805 if (!parallel_tunnels && 806 bcmp(sc2->gif_pdst, dst, dst->sa_len) == 0 && 807 bcmp(sc2->gif_psrc, src, src->sa_len) == 0) { 808 error = EADDRNOTAVAIL; 809 mtx_unlock(&gif_mtx); 810 goto bad; 811 } 812 813 /* XXX both end must be valid? (I mean, not 0.0.0.0) */ 814 } 815 mtx_unlock(&gif_mtx); 816 817 /* XXX we can detach from both, but be polite just in case */ 818 if (sc->gif_psrc) 819 switch (sc->gif_psrc->sa_family) { 820 #ifdef INET 821 case AF_INET: 822 (void)in_gif_detach(sc); 823 break; 824 #endif 825 #ifdef INET6 826 case AF_INET6: 827 (void)in6_gif_detach(sc); 828 break; 829 #endif 830 } 831 832 osrc = sc->gif_psrc; 833 sa = (struct sockaddr *)malloc(src->sa_len, M_IFADDR, M_WAITOK); 834 bcopy((caddr_t)src, (caddr_t)sa, src->sa_len); 835 sc->gif_psrc = sa; 836 837 odst = sc->gif_pdst; 838 sa = (struct sockaddr *)malloc(dst->sa_len, M_IFADDR, M_WAITOK); 839 bcopy((caddr_t)dst, (caddr_t)sa, dst->sa_len); 840 sc->gif_pdst = sa; 841 842 switch (sc->gif_psrc->sa_family) { 843 #ifdef INET 844 case AF_INET: 845 error = in_gif_attach(sc); 846 break; 847 #endif 848 #ifdef INET6 849 case AF_INET6: 850 /* 851 * Check validity of the scope zone ID of the addresses, and 852 * convert it into the kernel internal form if necessary. 853 */ 854 error = sa6_embedscope((struct sockaddr_in6 *)sc->gif_psrc, 0); 855 if (error != 0) 856 break; 857 error = sa6_embedscope((struct sockaddr_in6 *)sc->gif_pdst, 0); 858 if (error != 0) 859 break; 860 error = in6_gif_attach(sc); 861 break; 862 #endif 863 } 864 if (error) { 865 /* rollback */ 866 free((caddr_t)sc->gif_psrc, M_IFADDR); 867 free((caddr_t)sc->gif_pdst, M_IFADDR); 868 sc->gif_psrc = osrc; 869 sc->gif_pdst = odst; 870 goto bad; 871 } 872 873 if (osrc) 874 free((caddr_t)osrc, M_IFADDR); 875 if (odst) 876 free((caddr_t)odst, M_IFADDR); 877 878 if (sc->gif_psrc && sc->gif_pdst) 879 ifp->if_drv_flags |= IFF_DRV_RUNNING; 880 else 881 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 882 splx(s); 883 884 return 0; 885 886 bad: 887 if (sc->gif_psrc && sc->gif_pdst) 888 ifp->if_drv_flags |= IFF_DRV_RUNNING; 889 else 890 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 891 splx(s); 892 893 return error; 894 } 895 896 void 897 gif_delete_tunnel(ifp) 898 struct ifnet *ifp; 899 { 900 struct gif_softc *sc = ifp->if_softc; 901 int s; 902 903 s = splnet(); 904 905 if (sc->gif_psrc) { 906 free((caddr_t)sc->gif_psrc, M_IFADDR); 907 sc->gif_psrc = NULL; 908 } 909 if (sc->gif_pdst) { 910 free((caddr_t)sc->gif_pdst, M_IFADDR); 911 sc->gif_pdst = NULL; 912 } 913 /* it is safe to detach from both */ 914 #ifdef INET 915 (void)in_gif_detach(sc); 916 #endif 917 #ifdef INET6 918 (void)in6_gif_detach(sc); 919 #endif 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 splx(s); 926 } 927