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/malloc.h> 41 #include <sys/mbuf.h> 42 #include <sys/module.h> 43 #include <sys/socket.h> 44 #include <sys/sockio.h> 45 #include <sys/errno.h> 46 #include <sys/time.h> 47 #include <sys/sysctl.h> 48 #include <sys/syslog.h> 49 #include <sys/proc.h> 50 #include <sys/protosw.h> 51 #include <sys/conf.h> 52 #include <sys/vimage.h> 53 #include <machine/cpu.h> 54 55 #include <net/if.h> 56 #include <net/if_clone.h> 57 #include <net/if_types.h> 58 #include <net/netisr.h> 59 #include <net/route.h> 60 #include <net/bpf.h> 61 62 #include <netinet/in.h> 63 #include <netinet/in_systm.h> 64 #include <netinet/ip.h> 65 #ifdef INET 66 #include <netinet/in_var.h> 67 #include <netinet/in_gif.h> 68 #include <netinet/ip_var.h> 69 #endif /* INET */ 70 71 #ifdef INET6 72 #ifndef INET 73 #include <netinet/in.h> 74 #endif 75 #include <netinet6/in6_var.h> 76 #include <netinet/ip6.h> 77 #include <netinet6/ip6_var.h> 78 #include <netinet6/scope6_var.h> 79 #include <netinet6/in6_gif.h> 80 #include <netinet6/ip6protosw.h> 81 #endif /* INET6 */ 82 83 #include <netinet/ip_encap.h> 84 #include <net/ethernet.h> 85 #include <net/if_bridgevar.h> 86 #include <net/if_gif.h> 87 88 #include <security/mac/mac_framework.h> 89 90 #define GIFNAME "gif" 91 92 /* 93 * gif_mtx protects the global gif_softc_list. 94 */ 95 static struct mtx gif_mtx; 96 static MALLOC_DEFINE(M_GIF, "gif", "Generic Tunnel Interface"); 97 98 #ifndef VIMAGE 99 #ifndef VIMAGE_GLOBALS 100 struct vnet_gif vnet_gif_0; 101 #endif 102 #endif 103 104 #ifdef VIMAGE_GLOBALS 105 static LIST_HEAD(, gif_softc) gif_softc_list; 106 static int max_gif_nesting; 107 static int parallel_tunnels; 108 #ifdef INET 109 int ip_gif_ttl; 110 #endif 111 #ifdef INET6 112 int ip6_gif_hlim; 113 #endif 114 #endif 115 116 void (*ng_gif_input_p)(struct ifnet *ifp, struct mbuf **mp, int af); 117 void (*ng_gif_input_orphan_p)(struct ifnet *ifp, struct mbuf *m, int af); 118 void (*ng_gif_attach_p)(struct ifnet *ifp); 119 void (*ng_gif_detach_p)(struct ifnet *ifp); 120 121 static void gif_start(struct ifnet *); 122 static int gif_clone_create(struct if_clone *, int, caddr_t); 123 static void gif_clone_destroy(struct ifnet *); 124 static int vnet_gif_iattach(const void *); 125 126 #ifndef VIMAGE_GLOBALS 127 static const vnet_modinfo_t vnet_gif_modinfo = { 128 .vmi_id = VNET_MOD_GIF, 129 .vmi_name = "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 V_ip6_gif_hlim = 0; /* XXX -> vnet_gif_idetach() */ 307 #endif 308 break; 309 default: 310 return EOPNOTSUPP; 311 } 312 return 0; 313 } 314 315 static moduledata_t gif_mod = { 316 "if_gif", 317 gifmodevent, 318 0 319 }; 320 321 DECLARE_MODULE(if_gif, gif_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 322 MODULE_VERSION(if_gif, 1); 323 324 int 325 gif_encapcheck(m, off, proto, arg) 326 const struct mbuf *m; 327 int off; 328 int proto; 329 void *arg; 330 { 331 struct ip ip; 332 struct gif_softc *sc; 333 334 sc = (struct gif_softc *)arg; 335 if (sc == NULL) 336 return 0; 337 338 if ((GIF2IFP(sc)->if_flags & IFF_UP) == 0) 339 return 0; 340 341 /* no physical address */ 342 if (!sc->gif_psrc || !sc->gif_pdst) 343 return 0; 344 345 switch (proto) { 346 #ifdef INET 347 case IPPROTO_IPV4: 348 break; 349 #endif 350 #ifdef INET6 351 case IPPROTO_IPV6: 352 break; 353 #endif 354 case IPPROTO_ETHERIP: 355 break; 356 357 default: 358 return 0; 359 } 360 361 /* Bail on short packets */ 362 if (m->m_pkthdr.len < sizeof(ip)) 363 return 0; 364 365 m_copydata(m, 0, sizeof(ip), (caddr_t)&ip); 366 367 switch (ip.ip_v) { 368 #ifdef INET 369 case 4: 370 if (sc->gif_psrc->sa_family != AF_INET || 371 sc->gif_pdst->sa_family != AF_INET) 372 return 0; 373 return gif_encapcheck4(m, off, proto, arg); 374 #endif 375 #ifdef INET6 376 case 6: 377 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) 378 return 0; 379 if (sc->gif_psrc->sa_family != AF_INET6 || 380 sc->gif_pdst->sa_family != AF_INET6) 381 return 0; 382 return gif_encapcheck6(m, off, proto, arg); 383 #endif 384 default: 385 return 0; 386 } 387 } 388 389 static void 390 gif_start(struct ifnet *ifp) 391 { 392 struct gif_softc *sc; 393 struct mbuf *m; 394 395 sc = ifp->if_softc; 396 397 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 398 for (;;) { 399 IFQ_DEQUEUE(&ifp->if_snd, m); 400 if (m == 0) 401 break; 402 403 gif_output(ifp, m, sc->gif_pdst, NULL); 404 405 } 406 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 407 408 return; 409 } 410 411 int 412 gif_output(ifp, m, dst, ro) 413 struct ifnet *ifp; 414 struct mbuf *m; 415 struct sockaddr *dst; 416 struct route *ro; 417 { 418 INIT_VNET_GIF(ifp->if_vnet); 419 struct gif_softc *sc = ifp->if_softc; 420 struct m_tag *mtag; 421 int error = 0; 422 int gif_called; 423 u_int32_t af; 424 425 #ifdef MAC 426 error = mac_ifnet_check_transmit(ifp, m); 427 if (error) { 428 m_freem(m); 429 goto end; 430 } 431 #endif 432 433 /* 434 * gif may cause infinite recursion calls when misconfigured. 435 * We'll prevent this by detecting loops. 436 * 437 * High nesting level may cause stack exhaustion. 438 * We'll prevent this by introducing upper limit. 439 */ 440 gif_called = 1; 441 mtag = m_tag_locate(m, MTAG_GIF, MTAG_GIF_CALLED, NULL); 442 while (mtag != NULL) { 443 if (*(struct ifnet **)(mtag + 1) == ifp) { 444 log(LOG_NOTICE, 445 "gif_output: loop detected on %s\n", 446 (*(struct ifnet **)(mtag + 1))->if_xname); 447 m_freem(m); 448 error = EIO; /* is there better errno? */ 449 goto end; 450 } 451 mtag = m_tag_locate(m, MTAG_GIF, MTAG_GIF_CALLED, mtag); 452 gif_called++; 453 } 454 if (gif_called > V_max_gif_nesting) { 455 log(LOG_NOTICE, 456 "gif_output: recursively called too many times(%d)\n", 457 gif_called); 458 m_freem(m); 459 error = EIO; /* is there better errno? */ 460 goto end; 461 } 462 mtag = m_tag_alloc(MTAG_GIF, MTAG_GIF_CALLED, sizeof(struct ifnet *), 463 M_NOWAIT); 464 if (mtag == NULL) { 465 m_freem(m); 466 error = ENOMEM; 467 goto end; 468 } 469 *(struct ifnet **)(mtag + 1) = ifp; 470 m_tag_prepend(m, mtag); 471 472 m->m_flags &= ~(M_BCAST|M_MCAST); 473 474 GIF_LOCK(sc); 475 476 if (!(ifp->if_flags & IFF_UP) || 477 sc->gif_psrc == NULL || sc->gif_pdst == NULL) { 478 GIF_UNLOCK(sc); 479 m_freem(m); 480 error = ENETDOWN; 481 goto end; 482 } 483 484 /* BPF writes need to be handled specially. */ 485 if (dst->sa_family == AF_UNSPEC) { 486 bcopy(dst->sa_data, &af, sizeof(af)); 487 dst->sa_family = af; 488 } 489 490 af = dst->sa_family; 491 BPF_MTAP2(ifp, &af, sizeof(af), m); 492 ifp->if_opackets++; 493 ifp->if_obytes += m->m_pkthdr.len; 494 495 /* override to IPPROTO_ETHERIP for bridged traffic */ 496 if (ifp->if_bridge) 497 af = AF_LINK; 498 499 M_SETFIB(m, sc->gif_fibnum); 500 /* inner AF-specific encapsulation */ 501 502 /* XXX should we check if our outer source is legal? */ 503 504 /* dispatch to output logic based on outer AF */ 505 switch (sc->gif_psrc->sa_family) { 506 #ifdef INET 507 case AF_INET: 508 error = in_gif_output(ifp, af, m); 509 break; 510 #endif 511 #ifdef INET6 512 case AF_INET6: 513 error = in6_gif_output(ifp, af, m); 514 break; 515 #endif 516 default: 517 m_freem(m); 518 error = ENETDOWN; 519 } 520 521 GIF_UNLOCK(sc); 522 end: 523 if (error) 524 ifp->if_oerrors++; 525 return (error); 526 } 527 528 void 529 gif_input(m, af, ifp) 530 struct mbuf *m; 531 int af; 532 struct ifnet *ifp; 533 { 534 int isr, n; 535 struct etherip_header *eip; 536 struct ether_header *eh; 537 struct ifnet *oldifp; 538 539 if (ifp == NULL) { 540 /* just in case */ 541 m_freem(m); 542 return; 543 } 544 545 m->m_pkthdr.rcvif = ifp; 546 547 #ifdef MAC 548 mac_ifnet_create_mbuf(ifp, m); 549 #endif 550 551 if (bpf_peers_present(ifp->if_bpf)) { 552 u_int32_t af1 = af; 553 bpf_mtap2(ifp->if_bpf, &af1, sizeof(af1), m); 554 } 555 556 if (ng_gif_input_p != NULL) { 557 (*ng_gif_input_p)(ifp, &m, af); 558 if (m == NULL) 559 return; 560 } 561 562 /* 563 * Put the packet to the network layer input queue according to the 564 * specified address family. 565 * Note: older versions of gif_input directly called network layer 566 * input functions, e.g. ip6_input, here. We changed the policy to 567 * prevent too many recursive calls of such input functions, which 568 * might cause kernel panic. But the change may introduce another 569 * problem; if the input queue is full, packets are discarded. 570 * The kernel stack overflow really happened, and we believed 571 * queue-full rarely occurs, so we changed the policy. 572 */ 573 switch (af) { 574 #ifdef INET 575 case AF_INET: 576 isr = NETISR_IP; 577 break; 578 #endif 579 #ifdef INET6 580 case AF_INET6: 581 isr = NETISR_IPV6; 582 break; 583 #endif 584 case AF_LINK: 585 n = sizeof(struct etherip_header) + sizeof(struct ether_header); 586 if (n > m->m_len) { 587 m = m_pullup(m, n); 588 if (m == NULL) { 589 ifp->if_ierrors++; 590 return; 591 } 592 } 593 594 eip = mtod(m, struct etherip_header *); 595 if (eip->eip_ver != 596 (ETHERIP_VERSION & ETHERIP_VER_VERS_MASK)) { 597 /* discard unknown versions */ 598 m_freem(m); 599 return; 600 } 601 m_adj(m, sizeof(struct etherip_header)); 602 603 m->m_flags &= ~(M_BCAST|M_MCAST); 604 m->m_pkthdr.rcvif = ifp; 605 606 if (ifp->if_bridge) { 607 oldifp = ifp; 608 eh = mtod(m, struct ether_header *); 609 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 610 if (ETHER_IS_BROADCAST(eh->ether_dhost)) 611 m->m_flags |= M_BCAST; 612 else 613 m->m_flags |= M_MCAST; 614 ifp->if_imcasts++; 615 } 616 BRIDGE_INPUT(ifp, m); 617 618 if (m != NULL && ifp != oldifp) { 619 /* 620 * The bridge gave us back itself or one of the 621 * members for which the frame is addressed. 622 */ 623 ether_demux(ifp, m); 624 return; 625 } 626 } 627 if (m != NULL) 628 m_freem(m); 629 return; 630 631 default: 632 if (ng_gif_input_orphan_p != NULL) 633 (*ng_gif_input_orphan_p)(ifp, m, af); 634 else 635 m_freem(m); 636 return; 637 } 638 639 ifp->if_ipackets++; 640 ifp->if_ibytes += m->m_pkthdr.len; 641 netisr_dispatch(isr, m); 642 } 643 644 /* XXX how should we handle IPv6 scope on SIOC[GS]IFPHYADDR? */ 645 int 646 gif_ioctl(ifp, cmd, data) 647 struct ifnet *ifp; 648 u_long cmd; 649 caddr_t data; 650 { 651 struct gif_softc *sc = ifp->if_softc; 652 struct ifreq *ifr = (struct ifreq*)data; 653 int error = 0, size; 654 struct sockaddr *dst, *src; 655 #ifdef SIOCSIFMTU /* xxx */ 656 u_long mtu; 657 #endif 658 659 switch (cmd) { 660 case SIOCSIFADDR: 661 ifp->if_flags |= IFF_UP; 662 break; 663 664 case SIOCSIFDSTADDR: 665 break; 666 667 case SIOCADDMULTI: 668 case SIOCDELMULTI: 669 break; 670 671 #ifdef SIOCSIFMTU /* xxx */ 672 case SIOCGIFMTU: 673 break; 674 675 case SIOCSIFMTU: 676 mtu = ifr->ifr_mtu; 677 if (mtu < GIF_MTU_MIN || mtu > GIF_MTU_MAX) 678 return (EINVAL); 679 ifp->if_mtu = mtu; 680 break; 681 #endif /* SIOCSIFMTU */ 682 683 #ifdef INET 684 case SIOCSIFPHYADDR: 685 #endif 686 #ifdef INET6 687 case SIOCSIFPHYADDR_IN6: 688 #endif /* INET6 */ 689 case SIOCSLIFPHYADDR: 690 switch (cmd) { 691 #ifdef INET 692 case SIOCSIFPHYADDR: 693 src = (struct sockaddr *) 694 &(((struct in_aliasreq *)data)->ifra_addr); 695 dst = (struct sockaddr *) 696 &(((struct in_aliasreq *)data)->ifra_dstaddr); 697 break; 698 #endif 699 #ifdef INET6 700 case SIOCSIFPHYADDR_IN6: 701 src = (struct sockaddr *) 702 &(((struct in6_aliasreq *)data)->ifra_addr); 703 dst = (struct sockaddr *) 704 &(((struct in6_aliasreq *)data)->ifra_dstaddr); 705 break; 706 #endif 707 case SIOCSLIFPHYADDR: 708 src = (struct sockaddr *) 709 &(((struct if_laddrreq *)data)->addr); 710 dst = (struct sockaddr *) 711 &(((struct if_laddrreq *)data)->dstaddr); 712 break; 713 default: 714 return EINVAL; 715 } 716 717 /* sa_family must be equal */ 718 if (src->sa_family != dst->sa_family) 719 return EINVAL; 720 721 /* validate sa_len */ 722 switch (src->sa_family) { 723 #ifdef INET 724 case AF_INET: 725 if (src->sa_len != sizeof(struct sockaddr_in)) 726 return EINVAL; 727 break; 728 #endif 729 #ifdef INET6 730 case AF_INET6: 731 if (src->sa_len != sizeof(struct sockaddr_in6)) 732 return EINVAL; 733 break; 734 #endif 735 default: 736 return EAFNOSUPPORT; 737 } 738 switch (dst->sa_family) { 739 #ifdef INET 740 case AF_INET: 741 if (dst->sa_len != sizeof(struct sockaddr_in)) 742 return EINVAL; 743 break; 744 #endif 745 #ifdef INET6 746 case AF_INET6: 747 if (dst->sa_len != sizeof(struct sockaddr_in6)) 748 return EINVAL; 749 break; 750 #endif 751 default: 752 return EAFNOSUPPORT; 753 } 754 755 /* check sa_family looks sane for the cmd */ 756 switch (cmd) { 757 case SIOCSIFPHYADDR: 758 if (src->sa_family == AF_INET) 759 break; 760 return EAFNOSUPPORT; 761 #ifdef INET6 762 case SIOCSIFPHYADDR_IN6: 763 if (src->sa_family == AF_INET6) 764 break; 765 return EAFNOSUPPORT; 766 #endif /* INET6 */ 767 case SIOCSLIFPHYADDR: 768 /* checks done in the above */ 769 break; 770 } 771 772 error = gif_set_tunnel(GIF2IFP(sc), src, dst); 773 break; 774 775 #ifdef SIOCDIFPHYADDR 776 case SIOCDIFPHYADDR: 777 gif_delete_tunnel(GIF2IFP(sc)); 778 break; 779 #endif 780 781 case SIOCGIFPSRCADDR: 782 #ifdef INET6 783 case SIOCGIFPSRCADDR_IN6: 784 #endif /* INET6 */ 785 if (sc->gif_psrc == NULL) { 786 error = EADDRNOTAVAIL; 787 goto bad; 788 } 789 src = sc->gif_psrc; 790 switch (cmd) { 791 #ifdef INET 792 case SIOCGIFPSRCADDR: 793 dst = &ifr->ifr_addr; 794 size = sizeof(ifr->ifr_addr); 795 break; 796 #endif /* INET */ 797 #ifdef INET6 798 case SIOCGIFPSRCADDR_IN6: 799 dst = (struct sockaddr *) 800 &(((struct in6_ifreq *)data)->ifr_addr); 801 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 802 break; 803 #endif /* INET6 */ 804 default: 805 error = EADDRNOTAVAIL; 806 goto bad; 807 } 808 if (src->sa_len > size) 809 return EINVAL; 810 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 811 #ifdef INET6 812 if (dst->sa_family == AF_INET6) { 813 error = sa6_recoverscope((struct sockaddr_in6 *)dst); 814 if (error != 0) 815 return (error); 816 } 817 #endif 818 break; 819 820 case SIOCGIFPDSTADDR: 821 #ifdef INET6 822 case SIOCGIFPDSTADDR_IN6: 823 #endif /* INET6 */ 824 if (sc->gif_pdst == NULL) { 825 error = EADDRNOTAVAIL; 826 goto bad; 827 } 828 src = sc->gif_pdst; 829 switch (cmd) { 830 #ifdef INET 831 case SIOCGIFPDSTADDR: 832 dst = &ifr->ifr_addr; 833 size = sizeof(ifr->ifr_addr); 834 break; 835 #endif /* INET */ 836 #ifdef INET6 837 case SIOCGIFPDSTADDR_IN6: 838 dst = (struct sockaddr *) 839 &(((struct in6_ifreq *)data)->ifr_addr); 840 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 841 break; 842 #endif /* INET6 */ 843 default: 844 error = EADDRNOTAVAIL; 845 goto bad; 846 } 847 if (src->sa_len > size) 848 return EINVAL; 849 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 850 #ifdef INET6 851 if (dst->sa_family == AF_INET6) { 852 error = sa6_recoverscope((struct sockaddr_in6 *)dst); 853 if (error != 0) 854 return (error); 855 } 856 #endif 857 break; 858 859 case SIOCGLIFPHYADDR: 860 if (sc->gif_psrc == NULL || sc->gif_pdst == NULL) { 861 error = EADDRNOTAVAIL; 862 goto bad; 863 } 864 865 /* copy src */ 866 src = sc->gif_psrc; 867 dst = (struct sockaddr *) 868 &(((struct if_laddrreq *)data)->addr); 869 size = sizeof(((struct if_laddrreq *)data)->addr); 870 if (src->sa_len > size) 871 return EINVAL; 872 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 873 874 /* copy dst */ 875 src = sc->gif_pdst; 876 dst = (struct sockaddr *) 877 &(((struct if_laddrreq *)data)->dstaddr); 878 size = sizeof(((struct if_laddrreq *)data)->dstaddr); 879 if (src->sa_len > size) 880 return EINVAL; 881 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 882 break; 883 884 case SIOCSIFFLAGS: 885 /* if_ioctl() takes care of it */ 886 break; 887 888 default: 889 error = EINVAL; 890 break; 891 } 892 bad: 893 return error; 894 } 895 896 /* 897 * XXXRW: There's a general event-ordering issue here: the code to check 898 * if a given tunnel is already present happens before we perform a 899 * potentially blocking setup of the tunnel. This code needs to be 900 * re-ordered so that the check and replacement can be atomic using 901 * a mutex. 902 */ 903 int 904 gif_set_tunnel(ifp, src, dst) 905 struct ifnet *ifp; 906 struct sockaddr *src; 907 struct sockaddr *dst; 908 { 909 INIT_VNET_GIF(ifp->if_vnet); 910 struct gif_softc *sc = ifp->if_softc; 911 struct gif_softc *sc2; 912 struct sockaddr *osrc, *odst, *sa; 913 int error = 0; 914 915 mtx_lock(&gif_mtx); 916 LIST_FOREACH(sc2, &V_gif_softc_list, gif_list) { 917 if (sc2 == sc) 918 continue; 919 if (!sc2->gif_pdst || !sc2->gif_psrc) 920 continue; 921 if (sc2->gif_pdst->sa_family != dst->sa_family || 922 sc2->gif_pdst->sa_len != dst->sa_len || 923 sc2->gif_psrc->sa_family != src->sa_family || 924 sc2->gif_psrc->sa_len != src->sa_len) 925 continue; 926 927 /* 928 * Disallow parallel tunnels unless instructed 929 * otherwise. 930 */ 931 if (!V_parallel_tunnels && 932 bcmp(sc2->gif_pdst, dst, dst->sa_len) == 0 && 933 bcmp(sc2->gif_psrc, src, src->sa_len) == 0) { 934 error = EADDRNOTAVAIL; 935 mtx_unlock(&gif_mtx); 936 goto bad; 937 } 938 939 /* XXX both end must be valid? (I mean, not 0.0.0.0) */ 940 } 941 mtx_unlock(&gif_mtx); 942 943 /* XXX we can detach from both, but be polite just in case */ 944 if (sc->gif_psrc) 945 switch (sc->gif_psrc->sa_family) { 946 #ifdef INET 947 case AF_INET: 948 (void)in_gif_detach(sc); 949 break; 950 #endif 951 #ifdef INET6 952 case AF_INET6: 953 (void)in6_gif_detach(sc); 954 break; 955 #endif 956 } 957 958 osrc = sc->gif_psrc; 959 sa = (struct sockaddr *)malloc(src->sa_len, M_IFADDR, M_WAITOK); 960 bcopy((caddr_t)src, (caddr_t)sa, src->sa_len); 961 sc->gif_psrc = sa; 962 963 odst = sc->gif_pdst; 964 sa = (struct sockaddr *)malloc(dst->sa_len, M_IFADDR, M_WAITOK); 965 bcopy((caddr_t)dst, (caddr_t)sa, dst->sa_len); 966 sc->gif_pdst = sa; 967 968 switch (sc->gif_psrc->sa_family) { 969 #ifdef INET 970 case AF_INET: 971 error = in_gif_attach(sc); 972 break; 973 #endif 974 #ifdef INET6 975 case AF_INET6: 976 /* 977 * Check validity of the scope zone ID of the addresses, and 978 * convert it into the kernel internal form if necessary. 979 */ 980 error = sa6_embedscope((struct sockaddr_in6 *)sc->gif_psrc, 0); 981 if (error != 0) 982 break; 983 error = sa6_embedscope((struct sockaddr_in6 *)sc->gif_pdst, 0); 984 if (error != 0) 985 break; 986 error = in6_gif_attach(sc); 987 break; 988 #endif 989 } 990 if (error) { 991 /* rollback */ 992 free((caddr_t)sc->gif_psrc, M_IFADDR); 993 free((caddr_t)sc->gif_pdst, M_IFADDR); 994 sc->gif_psrc = osrc; 995 sc->gif_pdst = odst; 996 goto bad; 997 } 998 999 if (osrc) 1000 free((caddr_t)osrc, M_IFADDR); 1001 if (odst) 1002 free((caddr_t)odst, M_IFADDR); 1003 1004 bad: 1005 if (sc->gif_psrc && sc->gif_pdst) 1006 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1007 else 1008 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1009 1010 return error; 1011 } 1012 1013 void 1014 gif_delete_tunnel(ifp) 1015 struct ifnet *ifp; 1016 { 1017 struct gif_softc *sc = ifp->if_softc; 1018 1019 if (sc->gif_psrc) { 1020 free((caddr_t)sc->gif_psrc, M_IFADDR); 1021 sc->gif_psrc = NULL; 1022 } 1023 if (sc->gif_pdst) { 1024 free((caddr_t)sc->gif_pdst, M_IFADDR); 1025 sc->gif_pdst = NULL; 1026 } 1027 /* it is safe to detach from both */ 1028 #ifdef INET 1029 (void)in_gif_detach(sc); 1030 #endif 1031 #ifdef INET6 1032 (void)in6_gif_detach(sc); 1033 #endif 1034 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1035 } 1036