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 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/kernel.h> 39 #include <sys/malloc.h> 40 #include <sys/mbuf.h> 41 #include <sys/module.h> 42 #include <sys/socket.h> 43 #include <sys/sockio.h> 44 #include <sys/errno.h> 45 #include <sys/time.h> 46 #include <sys/sysctl.h> 47 #include <sys/syslog.h> 48 #include <sys/proc.h> 49 #include <sys/protosw.h> 50 #include <sys/conf.h> 51 #include <sys/vimage.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 <security/mac/mac_framework.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 97 #ifndef VIMAGE 98 #ifndef VIMAGE_GLOBALS 99 struct vnet_gif vnet_gif_0; 100 #endif 101 #endif 102 103 #ifdef VIMAGE_GLOBALS 104 static LIST_HEAD(, gif_softc) gif_softc_list; 105 static int max_gif_nesting; 106 static int parallel_tunnels; 107 #ifdef INET 108 int ip_gif_ttl; 109 #endif 110 #ifdef INET6 111 int ip6_gif_hlim; 112 #endif 113 #endif 114 115 void (*ng_gif_input_p)(struct ifnet *ifp, struct mbuf **mp, int af); 116 void (*ng_gif_input_orphan_p)(struct ifnet *ifp, struct mbuf *m, int af); 117 void (*ng_gif_attach_p)(struct ifnet *ifp); 118 void (*ng_gif_detach_p)(struct ifnet *ifp); 119 120 static void gif_start(struct ifnet *); 121 static int gif_clone_create(struct if_clone *, int, caddr_t); 122 static void gif_clone_destroy(struct ifnet *); 123 static int vnet_gif_iattach(const void *); 124 125 #ifndef VIMAGE_GLOBALS 126 static const vnet_modinfo_t vnet_gif_modinfo = { 127 .vmi_id = VNET_MOD_GIF, 128 .vmi_name = "gif", 129 .vmi_size = sizeof(struct vnet_gif), 130 .vmi_dependson = VNET_MOD_NET, 131 .vmi_iattach = vnet_gif_iattach 132 }; 133 #endif 134 135 IFC_SIMPLE_DECLARE(gif, 0); 136 137 static int gifmodevent(module_t, int, void *); 138 139 SYSCTL_DECL(_net_link); 140 SYSCTL_NODE(_net_link, IFT_GIF, gif, CTLFLAG_RW, 0, 141 "Generic Tunnel Interface"); 142 #ifndef MAX_GIF_NEST 143 /* 144 * This macro controls the default upper limitation on nesting of gif tunnels. 145 * Since, setting a large value to this macro with a careless configuration 146 * may introduce system crash, we don't allow any nestings by default. 147 * If you need to configure nested gif tunnels, you can define this macro 148 * in your kernel configuration file. However, if you do so, please be 149 * careful to configure the tunnels so that it won't make a loop. 150 */ 151 #define MAX_GIF_NEST 1 152 #endif 153 SYSCTL_V_INT(V_NET, vnet_gif, _net_link_gif, OID_AUTO, max_nesting, 154 CTLFLAG_RW, max_gif_nesting, 0, "Max nested tunnels"); 155 156 #ifdef INET6 157 SYSCTL_DECL(_net_inet6_ip6); 158 SYSCTL_V_INT(V_NET, vnet_gif, _net_inet6_ip6, IPV6CTL_GIF_HLIM, 159 gifhlim, CTLFLAG_RW, ip6_gif_hlim, 0, ""); 160 #endif 161 162 /* 163 * By default, we disallow creation of multiple tunnels between the same 164 * pair of addresses. Some applications require this functionality so 165 * we allow control over this check here. 166 */ 167 SYSCTL_V_INT(V_NET, vnet_gif, _net_link_gif, OID_AUTO, parallel_tunnels, 168 CTLFLAG_RW, parallel_tunnels, 0, "Allow parallel tunnels?"); 169 170 /* copy from src/sys/net/if_ethersubr.c */ 171 static const u_char etherbroadcastaddr[ETHER_ADDR_LEN] = 172 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 173 #ifndef ETHER_IS_BROADCAST 174 #define ETHER_IS_BROADCAST(addr) \ 175 (bcmp(etherbroadcastaddr, (addr), ETHER_ADDR_LEN) == 0) 176 #endif 177 178 static int 179 gif_clone_create(ifc, unit, params) 180 struct if_clone *ifc; 181 int unit; 182 caddr_t params; 183 { 184 INIT_VNET_GIF(curvnet); 185 struct gif_softc *sc; 186 187 sc = malloc(sizeof(struct gif_softc), M_GIF, M_WAITOK | M_ZERO); 188 sc->gif_fibnum = curthread->td_proc->p_fibnum; 189 GIF2IFP(sc) = if_alloc(IFT_GIF); 190 if (GIF2IFP(sc) == NULL) { 191 free(sc, M_GIF); 192 return (ENOSPC); 193 } 194 195 GIF_LOCK_INIT(sc); 196 197 GIF2IFP(sc)->if_softc = sc; 198 if_initname(GIF2IFP(sc), ifc->ifc_name, unit); 199 200 sc->encap_cookie4 = sc->encap_cookie6 = NULL; 201 202 GIF2IFP(sc)->if_addrlen = 0; 203 GIF2IFP(sc)->if_mtu = GIF_MTU; 204 GIF2IFP(sc)->if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 205 #if 0 206 /* turn off ingress filter */ 207 GIF2IFP(sc)->if_flags |= IFF_LINK2; 208 #endif 209 GIF2IFP(sc)->if_ioctl = gif_ioctl; 210 GIF2IFP(sc)->if_start = gif_start; 211 GIF2IFP(sc)->if_output = gif_output; 212 GIF2IFP(sc)->if_snd.ifq_maxlen = IFQ_MAXLEN; 213 if_attach(GIF2IFP(sc)); 214 bpfattach(GIF2IFP(sc), DLT_NULL, sizeof(u_int32_t)); 215 if (ng_gif_attach_p != NULL) 216 (*ng_gif_attach_p)(GIF2IFP(sc)); 217 218 mtx_lock(&gif_mtx); 219 LIST_INSERT_HEAD(&V_gif_softc_list, sc, gif_list); 220 mtx_unlock(&gif_mtx); 221 222 return (0); 223 } 224 225 static void 226 gif_clone_destroy(ifp) 227 struct ifnet *ifp; 228 { 229 #if defined(INET) || defined(INET6) 230 int err; 231 #endif 232 struct gif_softc *sc = ifp->if_softc; 233 234 mtx_lock(&gif_mtx); 235 LIST_REMOVE(sc, gif_list); 236 mtx_unlock(&gif_mtx); 237 238 gif_delete_tunnel(ifp); 239 #ifdef INET6 240 if (sc->encap_cookie6 != NULL) { 241 err = encap_detach(sc->encap_cookie6); 242 KASSERT(err == 0, ("Unexpected error detaching encap_cookie6")); 243 } 244 #endif 245 #ifdef INET 246 if (sc->encap_cookie4 != NULL) { 247 err = encap_detach(sc->encap_cookie4); 248 KASSERT(err == 0, ("Unexpected error detaching encap_cookie4")); 249 } 250 #endif 251 252 if (ng_gif_detach_p != NULL) 253 (*ng_gif_detach_p)(ifp); 254 bpfdetach(ifp); 255 if_detach(ifp); 256 if_free(ifp); 257 258 GIF_LOCK_DESTROY(sc); 259 260 free(sc, M_GIF); 261 } 262 263 static int 264 vnet_gif_iattach(const void *unused __unused) 265 { 266 INIT_VNET_GIF(curvnet); 267 268 LIST_INIT(&V_gif_softc_list); 269 V_max_gif_nesting = MAX_GIF_NEST; 270 #ifdef XBONEHACK 271 V_parallel_tunnels = 1; 272 #else 273 V_parallel_tunnels = 0; 274 #endif 275 V_ip_gif_ttl = GIF_TTL; 276 #ifdef INET6 277 V_ip6_gif_hlim = GIF_HLIM; 278 #endif 279 280 return (0); 281 } 282 283 static int 284 gifmodevent(mod, type, data) 285 module_t mod; 286 int type; 287 void *data; 288 { 289 290 switch (type) { 291 case MOD_LOAD: 292 mtx_init(&gif_mtx, "gif_mtx", NULL, MTX_DEF); 293 294 #ifndef VIMAGE_GLOBALS 295 vnet_mod_register(&vnet_gif_modinfo); 296 #else 297 vnet_gif_iattach(NULL); 298 #endif 299 if_clone_attach(&gif_cloner); 300 301 break; 302 case MOD_UNLOAD: 303 if_clone_detach(&gif_cloner); 304 mtx_destroy(&gif_mtx); 305 #ifdef INET6 306 #ifndef VIMAGE 307 V_ip6_gif_hlim = 0; /* XXX -> vnet_gif_idetach() */ 308 #endif 309 #endif 310 break; 311 default: 312 return EOPNOTSUPP; 313 } 314 return 0; 315 } 316 317 static moduledata_t gif_mod = { 318 "if_gif", 319 gifmodevent, 320 0 321 }; 322 323 DECLARE_MODULE(if_gif, gif_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 324 MODULE_VERSION(if_gif, 1); 325 326 int 327 gif_encapcheck(m, off, proto, arg) 328 const struct mbuf *m; 329 int off; 330 int proto; 331 void *arg; 332 { 333 struct ip ip; 334 struct gif_softc *sc; 335 336 sc = (struct gif_softc *)arg; 337 if (sc == NULL) 338 return 0; 339 340 if ((GIF2IFP(sc)->if_flags & IFF_UP) == 0) 341 return 0; 342 343 /* no physical address */ 344 if (!sc->gif_psrc || !sc->gif_pdst) 345 return 0; 346 347 switch (proto) { 348 #ifdef INET 349 case IPPROTO_IPV4: 350 break; 351 #endif 352 #ifdef INET6 353 case IPPROTO_IPV6: 354 break; 355 #endif 356 case IPPROTO_ETHERIP: 357 break; 358 359 default: 360 return 0; 361 } 362 363 /* Bail on short packets */ 364 if (m->m_pkthdr.len < sizeof(ip)) 365 return 0; 366 367 m_copydata(m, 0, sizeof(ip), (caddr_t)&ip); 368 369 switch (ip.ip_v) { 370 #ifdef INET 371 case 4: 372 if (sc->gif_psrc->sa_family != AF_INET || 373 sc->gif_pdst->sa_family != AF_INET) 374 return 0; 375 return gif_encapcheck4(m, off, proto, arg); 376 #endif 377 #ifdef INET6 378 case 6: 379 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) 380 return 0; 381 if (sc->gif_psrc->sa_family != AF_INET6 || 382 sc->gif_pdst->sa_family != AF_INET6) 383 return 0; 384 return gif_encapcheck6(m, off, proto, arg); 385 #endif 386 default: 387 return 0; 388 } 389 } 390 391 static void 392 gif_start(struct ifnet *ifp) 393 { 394 struct gif_softc *sc; 395 struct mbuf *m; 396 397 sc = ifp->if_softc; 398 399 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 400 for (;;) { 401 IFQ_DEQUEUE(&ifp->if_snd, m); 402 if (m == 0) 403 break; 404 405 gif_output(ifp, m, sc->gif_pdst, NULL); 406 407 } 408 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 409 410 return; 411 } 412 413 int 414 gif_output(ifp, m, dst, ro) 415 struct ifnet *ifp; 416 struct mbuf *m; 417 struct sockaddr *dst; 418 struct route *ro; 419 { 420 INIT_VNET_GIF(ifp->if_vnet); 421 struct gif_softc *sc = ifp->if_softc; 422 struct m_tag *mtag; 423 int error = 0; 424 int gif_called; 425 u_int32_t af; 426 427 #ifdef MAC 428 error = mac_ifnet_check_transmit(ifp, m); 429 if (error) { 430 m_freem(m); 431 goto end; 432 } 433 #endif 434 435 /* 436 * gif may cause infinite recursion calls when misconfigured. 437 * We'll prevent this by detecting loops. 438 * 439 * High nesting level may cause stack exhaustion. 440 * We'll prevent this by introducing upper limit. 441 */ 442 gif_called = 1; 443 mtag = m_tag_locate(m, MTAG_GIF, MTAG_GIF_CALLED, NULL); 444 while (mtag != NULL) { 445 if (*(struct ifnet **)(mtag + 1) == ifp) { 446 log(LOG_NOTICE, 447 "gif_output: loop detected on %s\n", 448 (*(struct ifnet **)(mtag + 1))->if_xname); 449 m_freem(m); 450 error = EIO; /* is there better errno? */ 451 goto end; 452 } 453 mtag = m_tag_locate(m, MTAG_GIF, MTAG_GIF_CALLED, mtag); 454 gif_called++; 455 } 456 if (gif_called > V_max_gif_nesting) { 457 log(LOG_NOTICE, 458 "gif_output: recursively called too many times(%d)\n", 459 gif_called); 460 m_freem(m); 461 error = EIO; /* is there better errno? */ 462 goto end; 463 } 464 mtag = m_tag_alloc(MTAG_GIF, MTAG_GIF_CALLED, sizeof(struct ifnet *), 465 M_NOWAIT); 466 if (mtag == NULL) { 467 m_freem(m); 468 error = ENOMEM; 469 goto end; 470 } 471 *(struct ifnet **)(mtag + 1) = ifp; 472 m_tag_prepend(m, mtag); 473 474 m->m_flags &= ~(M_BCAST|M_MCAST); 475 476 GIF_LOCK(sc); 477 478 if (!(ifp->if_flags & IFF_UP) || 479 sc->gif_psrc == NULL || sc->gif_pdst == NULL) { 480 GIF_UNLOCK(sc); 481 m_freem(m); 482 error = ENETDOWN; 483 goto end; 484 } 485 486 /* BPF writes need to be handled specially. */ 487 if (dst->sa_family == AF_UNSPEC) { 488 bcopy(dst->sa_data, &af, sizeof(af)); 489 dst->sa_family = af; 490 } 491 492 af = dst->sa_family; 493 BPF_MTAP2(ifp, &af, sizeof(af), m); 494 ifp->if_opackets++; 495 ifp->if_obytes += m->m_pkthdr.len; 496 497 /* override to IPPROTO_ETHERIP for bridged traffic */ 498 if (ifp->if_bridge) 499 af = AF_LINK; 500 501 M_SETFIB(m, sc->gif_fibnum); 502 /* inner AF-specific encapsulation */ 503 504 /* XXX should we check if our outer source is legal? */ 505 506 /* dispatch to output logic based on outer AF */ 507 switch (sc->gif_psrc->sa_family) { 508 #ifdef INET 509 case AF_INET: 510 error = in_gif_output(ifp, af, m); 511 break; 512 #endif 513 #ifdef INET6 514 case AF_INET6: 515 error = in6_gif_output(ifp, af, m); 516 break; 517 #endif 518 default: 519 m_freem(m); 520 error = ENETDOWN; 521 } 522 523 GIF_UNLOCK(sc); 524 end: 525 if (error) 526 ifp->if_oerrors++; 527 return (error); 528 } 529 530 void 531 gif_input(m, af, ifp) 532 struct mbuf *m; 533 int af; 534 struct ifnet *ifp; 535 { 536 int isr, n; 537 struct etherip_header *eip; 538 struct ether_header *eh; 539 struct ifnet *oldifp; 540 541 if (ifp == NULL) { 542 /* just in case */ 543 m_freem(m); 544 return; 545 } 546 547 m->m_pkthdr.rcvif = ifp; 548 549 #ifdef MAC 550 mac_ifnet_create_mbuf(ifp, m); 551 #endif 552 553 if (bpf_peers_present(ifp->if_bpf)) { 554 u_int32_t af1 = af; 555 bpf_mtap2(ifp->if_bpf, &af1, sizeof(af1), m); 556 } 557 558 if (ng_gif_input_p != NULL) { 559 (*ng_gif_input_p)(ifp, &m, af); 560 if (m == NULL) 561 return; 562 } 563 564 /* 565 * Put the packet to the network layer input queue according to the 566 * specified address family. 567 * Note: older versions of gif_input directly called network layer 568 * input functions, e.g. ip6_input, here. We changed the policy to 569 * prevent too many recursive calls of such input functions, which 570 * might cause kernel panic. But the change may introduce another 571 * problem; if the input queue is full, packets are discarded. 572 * The kernel stack overflow really happened, and we believed 573 * queue-full rarely occurs, so we changed the policy. 574 */ 575 switch (af) { 576 #ifdef INET 577 case AF_INET: 578 isr = NETISR_IP; 579 break; 580 #endif 581 #ifdef INET6 582 case AF_INET6: 583 isr = NETISR_IPV6; 584 break; 585 #endif 586 case AF_LINK: 587 n = sizeof(struct etherip_header) + sizeof(struct ether_header); 588 if (n > m->m_len) { 589 m = m_pullup(m, n); 590 if (m == NULL) { 591 ifp->if_ierrors++; 592 return; 593 } 594 } 595 596 eip = mtod(m, struct etherip_header *); 597 if (eip->eip_ver != 598 (ETHERIP_VERSION & ETHERIP_VER_VERS_MASK)) { 599 /* discard unknown versions */ 600 m_freem(m); 601 return; 602 } 603 m_adj(m, sizeof(struct etherip_header)); 604 605 m->m_flags &= ~(M_BCAST|M_MCAST); 606 m->m_pkthdr.rcvif = ifp; 607 608 if (ifp->if_bridge) { 609 oldifp = ifp; 610 eh = mtod(m, struct ether_header *); 611 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 612 if (ETHER_IS_BROADCAST(eh->ether_dhost)) 613 m->m_flags |= M_BCAST; 614 else 615 m->m_flags |= M_MCAST; 616 ifp->if_imcasts++; 617 } 618 BRIDGE_INPUT(ifp, m); 619 620 if (m != NULL && ifp != oldifp) { 621 /* 622 * The bridge gave us back itself or one of the 623 * members for which the frame is addressed. 624 */ 625 ether_demux(ifp, m); 626 return; 627 } 628 } 629 if (m != NULL) 630 m_freem(m); 631 return; 632 633 default: 634 if (ng_gif_input_orphan_p != NULL) 635 (*ng_gif_input_orphan_p)(ifp, m, af); 636 else 637 m_freem(m); 638 return; 639 } 640 641 ifp->if_ipackets++; 642 ifp->if_ibytes += m->m_pkthdr.len; 643 netisr_dispatch(isr, m); 644 } 645 646 /* XXX how should we handle IPv6 scope on SIOC[GS]IFPHYADDR? */ 647 int 648 gif_ioctl(ifp, cmd, data) 649 struct ifnet *ifp; 650 u_long cmd; 651 caddr_t data; 652 { 653 struct gif_softc *sc = ifp->if_softc; 654 struct ifreq *ifr = (struct ifreq*)data; 655 int error = 0, size; 656 struct sockaddr *dst, *src; 657 #ifdef SIOCSIFMTU /* xxx */ 658 u_long mtu; 659 #endif 660 661 switch (cmd) { 662 case SIOCSIFADDR: 663 ifp->if_flags |= IFF_UP; 664 break; 665 666 case SIOCSIFDSTADDR: 667 break; 668 669 case SIOCADDMULTI: 670 case SIOCDELMULTI: 671 break; 672 673 #ifdef SIOCSIFMTU /* xxx */ 674 case SIOCGIFMTU: 675 break; 676 677 case SIOCSIFMTU: 678 mtu = ifr->ifr_mtu; 679 if (mtu < GIF_MTU_MIN || mtu > GIF_MTU_MAX) 680 return (EINVAL); 681 ifp->if_mtu = mtu; 682 break; 683 #endif /* SIOCSIFMTU */ 684 685 #ifdef INET 686 case SIOCSIFPHYADDR: 687 #endif 688 #ifdef INET6 689 case SIOCSIFPHYADDR_IN6: 690 #endif /* INET6 */ 691 case SIOCSLIFPHYADDR: 692 switch (cmd) { 693 #ifdef INET 694 case SIOCSIFPHYADDR: 695 src = (struct sockaddr *) 696 &(((struct in_aliasreq *)data)->ifra_addr); 697 dst = (struct sockaddr *) 698 &(((struct in_aliasreq *)data)->ifra_dstaddr); 699 break; 700 #endif 701 #ifdef INET6 702 case SIOCSIFPHYADDR_IN6: 703 src = (struct sockaddr *) 704 &(((struct in6_aliasreq *)data)->ifra_addr); 705 dst = (struct sockaddr *) 706 &(((struct in6_aliasreq *)data)->ifra_dstaddr); 707 break; 708 #endif 709 case SIOCSLIFPHYADDR: 710 src = (struct sockaddr *) 711 &(((struct if_laddrreq *)data)->addr); 712 dst = (struct sockaddr *) 713 &(((struct if_laddrreq *)data)->dstaddr); 714 break; 715 default: 716 return EINVAL; 717 } 718 719 /* sa_family must be equal */ 720 if (src->sa_family != dst->sa_family) 721 return EINVAL; 722 723 /* validate sa_len */ 724 switch (src->sa_family) { 725 #ifdef INET 726 case AF_INET: 727 if (src->sa_len != sizeof(struct sockaddr_in)) 728 return EINVAL; 729 break; 730 #endif 731 #ifdef INET6 732 case AF_INET6: 733 if (src->sa_len != sizeof(struct sockaddr_in6)) 734 return EINVAL; 735 break; 736 #endif 737 default: 738 return EAFNOSUPPORT; 739 } 740 switch (dst->sa_family) { 741 #ifdef INET 742 case AF_INET: 743 if (dst->sa_len != sizeof(struct sockaddr_in)) 744 return EINVAL; 745 break; 746 #endif 747 #ifdef INET6 748 case AF_INET6: 749 if (dst->sa_len != sizeof(struct sockaddr_in6)) 750 return EINVAL; 751 break; 752 #endif 753 default: 754 return EAFNOSUPPORT; 755 } 756 757 /* check sa_family looks sane for the cmd */ 758 switch (cmd) { 759 case SIOCSIFPHYADDR: 760 if (src->sa_family == AF_INET) 761 break; 762 return EAFNOSUPPORT; 763 #ifdef INET6 764 case SIOCSIFPHYADDR_IN6: 765 if (src->sa_family == AF_INET6) 766 break; 767 return EAFNOSUPPORT; 768 #endif /* INET6 */ 769 case SIOCSLIFPHYADDR: 770 /* checks done in the above */ 771 break; 772 } 773 774 error = gif_set_tunnel(GIF2IFP(sc), src, dst); 775 break; 776 777 #ifdef SIOCDIFPHYADDR 778 case SIOCDIFPHYADDR: 779 gif_delete_tunnel(GIF2IFP(sc)); 780 break; 781 #endif 782 783 case SIOCGIFPSRCADDR: 784 #ifdef INET6 785 case SIOCGIFPSRCADDR_IN6: 786 #endif /* INET6 */ 787 if (sc->gif_psrc == NULL) { 788 error = EADDRNOTAVAIL; 789 goto bad; 790 } 791 src = sc->gif_psrc; 792 switch (cmd) { 793 #ifdef INET 794 case SIOCGIFPSRCADDR: 795 dst = &ifr->ifr_addr; 796 size = sizeof(ifr->ifr_addr); 797 break; 798 #endif /* INET */ 799 #ifdef INET6 800 case SIOCGIFPSRCADDR_IN6: 801 dst = (struct sockaddr *) 802 &(((struct in6_ifreq *)data)->ifr_addr); 803 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 804 break; 805 #endif /* INET6 */ 806 default: 807 error = EADDRNOTAVAIL; 808 goto bad; 809 } 810 if (src->sa_len > size) 811 return EINVAL; 812 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 813 #ifdef INET6 814 if (dst->sa_family == AF_INET6) { 815 error = sa6_recoverscope((struct sockaddr_in6 *)dst); 816 if (error != 0) 817 return (error); 818 } 819 #endif 820 break; 821 822 case SIOCGIFPDSTADDR: 823 #ifdef INET6 824 case SIOCGIFPDSTADDR_IN6: 825 #endif /* INET6 */ 826 if (sc->gif_pdst == NULL) { 827 error = EADDRNOTAVAIL; 828 goto bad; 829 } 830 src = sc->gif_pdst; 831 switch (cmd) { 832 #ifdef INET 833 case SIOCGIFPDSTADDR: 834 dst = &ifr->ifr_addr; 835 size = sizeof(ifr->ifr_addr); 836 break; 837 #endif /* INET */ 838 #ifdef INET6 839 case SIOCGIFPDSTADDR_IN6: 840 dst = (struct sockaddr *) 841 &(((struct in6_ifreq *)data)->ifr_addr); 842 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 843 break; 844 #endif /* INET6 */ 845 default: 846 error = EADDRNOTAVAIL; 847 goto bad; 848 } 849 if (src->sa_len > size) 850 return EINVAL; 851 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 852 #ifdef INET6 853 if (dst->sa_family == AF_INET6) { 854 error = sa6_recoverscope((struct sockaddr_in6 *)dst); 855 if (error != 0) 856 return (error); 857 } 858 #endif 859 break; 860 861 case SIOCGLIFPHYADDR: 862 if (sc->gif_psrc == NULL || sc->gif_pdst == NULL) { 863 error = EADDRNOTAVAIL; 864 goto bad; 865 } 866 867 /* copy src */ 868 src = sc->gif_psrc; 869 dst = (struct sockaddr *) 870 &(((struct if_laddrreq *)data)->addr); 871 size = sizeof(((struct if_laddrreq *)data)->addr); 872 if (src->sa_len > size) 873 return EINVAL; 874 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 875 876 /* copy dst */ 877 src = sc->gif_pdst; 878 dst = (struct sockaddr *) 879 &(((struct if_laddrreq *)data)->dstaddr); 880 size = sizeof(((struct if_laddrreq *)data)->dstaddr); 881 if (src->sa_len > size) 882 return EINVAL; 883 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 884 break; 885 886 case SIOCSIFFLAGS: 887 /* if_ioctl() takes care of it */ 888 break; 889 890 default: 891 error = EINVAL; 892 break; 893 } 894 bad: 895 return error; 896 } 897 898 /* 899 * XXXRW: There's a general event-ordering issue here: the code to check 900 * if a given tunnel is already present happens before we perform a 901 * potentially blocking setup of the tunnel. This code needs to be 902 * re-ordered so that the check and replacement can be atomic using 903 * a mutex. 904 */ 905 int 906 gif_set_tunnel(ifp, src, dst) 907 struct ifnet *ifp; 908 struct sockaddr *src; 909 struct sockaddr *dst; 910 { 911 INIT_VNET_GIF(ifp->if_vnet); 912 struct gif_softc *sc = ifp->if_softc; 913 struct gif_softc *sc2; 914 struct sockaddr *osrc, *odst, *sa; 915 int error = 0; 916 917 mtx_lock(&gif_mtx); 918 LIST_FOREACH(sc2, &V_gif_softc_list, gif_list) { 919 if (sc2 == sc) 920 continue; 921 if (!sc2->gif_pdst || !sc2->gif_psrc) 922 continue; 923 if (sc2->gif_pdst->sa_family != dst->sa_family || 924 sc2->gif_pdst->sa_len != dst->sa_len || 925 sc2->gif_psrc->sa_family != src->sa_family || 926 sc2->gif_psrc->sa_len != src->sa_len) 927 continue; 928 929 /* 930 * Disallow parallel tunnels unless instructed 931 * otherwise. 932 */ 933 if (!V_parallel_tunnels && 934 bcmp(sc2->gif_pdst, dst, dst->sa_len) == 0 && 935 bcmp(sc2->gif_psrc, src, src->sa_len) == 0) { 936 error = EADDRNOTAVAIL; 937 mtx_unlock(&gif_mtx); 938 goto bad; 939 } 940 941 /* XXX both end must be valid? (I mean, not 0.0.0.0) */ 942 } 943 mtx_unlock(&gif_mtx); 944 945 /* XXX we can detach from both, but be polite just in case */ 946 if (sc->gif_psrc) 947 switch (sc->gif_psrc->sa_family) { 948 #ifdef INET 949 case AF_INET: 950 (void)in_gif_detach(sc); 951 break; 952 #endif 953 #ifdef INET6 954 case AF_INET6: 955 (void)in6_gif_detach(sc); 956 break; 957 #endif 958 } 959 960 osrc = sc->gif_psrc; 961 sa = (struct sockaddr *)malloc(src->sa_len, M_IFADDR, M_WAITOK); 962 bcopy((caddr_t)src, (caddr_t)sa, src->sa_len); 963 sc->gif_psrc = sa; 964 965 odst = sc->gif_pdst; 966 sa = (struct sockaddr *)malloc(dst->sa_len, M_IFADDR, M_WAITOK); 967 bcopy((caddr_t)dst, (caddr_t)sa, dst->sa_len); 968 sc->gif_pdst = sa; 969 970 switch (sc->gif_psrc->sa_family) { 971 #ifdef INET 972 case AF_INET: 973 error = in_gif_attach(sc); 974 break; 975 #endif 976 #ifdef INET6 977 case AF_INET6: 978 /* 979 * Check validity of the scope zone ID of the addresses, and 980 * convert it into the kernel internal form if necessary. 981 */ 982 error = sa6_embedscope((struct sockaddr_in6 *)sc->gif_psrc, 0); 983 if (error != 0) 984 break; 985 error = sa6_embedscope((struct sockaddr_in6 *)sc->gif_pdst, 0); 986 if (error != 0) 987 break; 988 error = in6_gif_attach(sc); 989 break; 990 #endif 991 } 992 if (error) { 993 /* rollback */ 994 free((caddr_t)sc->gif_psrc, M_IFADDR); 995 free((caddr_t)sc->gif_pdst, M_IFADDR); 996 sc->gif_psrc = osrc; 997 sc->gif_pdst = odst; 998 goto bad; 999 } 1000 1001 if (osrc) 1002 free((caddr_t)osrc, M_IFADDR); 1003 if (odst) 1004 free((caddr_t)odst, M_IFADDR); 1005 1006 bad: 1007 if (sc->gif_psrc && sc->gif_pdst) 1008 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1009 else 1010 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1011 1012 return error; 1013 } 1014 1015 void 1016 gif_delete_tunnel(ifp) 1017 struct ifnet *ifp; 1018 { 1019 struct gif_softc *sc = ifp->if_softc; 1020 1021 if (sc->gif_psrc) { 1022 free((caddr_t)sc->gif_psrc, M_IFADDR); 1023 sc->gif_psrc = NULL; 1024 } 1025 if (sc->gif_pdst) { 1026 free((caddr_t)sc->gif_pdst, M_IFADDR); 1027 sc->gif_pdst = NULL; 1028 } 1029 /* it is safe to detach from both */ 1030 #ifdef INET 1031 (void)in_gif_detach(sc); 1032 #endif 1033 #ifdef INET6 1034 (void)in6_gif_detach(sc); 1035 #endif 1036 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1037 } 1038