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