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 #ifdef VIMAGE_GLOBALS 99 static LIST_HEAD(, gif_softc) gif_softc_list; 100 static int max_gif_nesting; 101 static int parallel_tunnels; 102 #ifdef INET 103 int ip_gif_ttl; 104 #endif 105 #ifdef INET6 106 int ip6_gif_hlim; 107 #endif 108 #endif 109 110 void (*ng_gif_input_p)(struct ifnet *ifp, struct mbuf **mp, int af); 111 void (*ng_gif_input_orphan_p)(struct ifnet *ifp, struct mbuf *m, int af); 112 void (*ng_gif_attach_p)(struct ifnet *ifp); 113 void (*ng_gif_detach_p)(struct ifnet *ifp); 114 115 static void gif_start(struct ifnet *); 116 static int gif_clone_create(struct if_clone *, int, caddr_t); 117 static void gif_clone_destroy(struct ifnet *); 118 119 IFC_SIMPLE_DECLARE(gif, 0); 120 121 static int gifmodevent(module_t, int, void *); 122 123 SYSCTL_DECL(_net_link); 124 SYSCTL_NODE(_net_link, IFT_GIF, gif, CTLFLAG_RW, 0, 125 "Generic Tunnel Interface"); 126 #ifndef MAX_GIF_NEST 127 /* 128 * This macro controls the default upper limitation on nesting of gif tunnels. 129 * Since, setting a large value to this macro with a careless configuration 130 * may introduce system crash, we don't allow any nestings by default. 131 * If you need to configure nested gif tunnels, you can define this macro 132 * in your kernel configuration file. However, if you do so, please be 133 * careful to configure the tunnels so that it won't make a loop. 134 */ 135 #define MAX_GIF_NEST 1 136 #endif 137 SYSCTL_V_INT(V_NET, vnet_gif, _net_link_gif, OID_AUTO, max_nesting, 138 CTLFLAG_RW, max_gif_nesting, 0, "Max nested tunnels"); 139 140 #ifdef INET6 141 SYSCTL_DECL(_net_inet6_ip6); 142 SYSCTL_V_INT(V_NET, vnet_gif, _net_inet6_ip6, IPV6CTL_GIF_HLIM, 143 gifhlim, CTLFLAG_RW, ip6_gif_hlim, 0, ""); 144 #endif 145 146 /* 147 * By default, we disallow creation of multiple tunnels between the same 148 * pair of addresses. Some applications require this functionality so 149 * we allow control over this check here. 150 */ 151 SYSCTL_V_INT(V_NET, vnet_gif, _net_link_gif, OID_AUTO, parallel_tunnels, 152 CTLFLAG_RW, parallel_tunnels, 0, "Allow parallel tunnels?"); 153 154 /* copy from src/sys/net/if_ethersubr.c */ 155 static const u_char etherbroadcastaddr[ETHER_ADDR_LEN] = 156 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 157 #ifndef ETHER_IS_BROADCAST 158 #define ETHER_IS_BROADCAST(addr) \ 159 (bcmp(etherbroadcastaddr, (addr), ETHER_ADDR_LEN) == 0) 160 #endif 161 162 static int 163 gif_clone_create(ifc, unit, params) 164 struct if_clone *ifc; 165 int unit; 166 caddr_t params; 167 { 168 INIT_VNET_GIF(curvnet); 169 struct gif_softc *sc; 170 171 sc = malloc(sizeof(struct gif_softc), M_GIF, M_WAITOK | M_ZERO); 172 sc->gif_fibnum = curthread->td_proc->p_fibnum; 173 GIF2IFP(sc) = if_alloc(IFT_GIF); 174 if (GIF2IFP(sc) == NULL) { 175 free(sc, M_GIF); 176 return (ENOSPC); 177 } 178 179 GIF_LOCK_INIT(sc); 180 181 GIF2IFP(sc)->if_softc = sc; 182 if_initname(GIF2IFP(sc), ifc->ifc_name, unit); 183 184 sc->encap_cookie4 = sc->encap_cookie6 = NULL; 185 186 GIF2IFP(sc)->if_addrlen = 0; 187 GIF2IFP(sc)->if_mtu = GIF_MTU; 188 GIF2IFP(sc)->if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 189 #if 0 190 /* turn off ingress filter */ 191 GIF2IFP(sc)->if_flags |= IFF_LINK2; 192 #endif 193 GIF2IFP(sc)->if_ioctl = gif_ioctl; 194 GIF2IFP(sc)->if_start = gif_start; 195 GIF2IFP(sc)->if_output = gif_output; 196 GIF2IFP(sc)->if_snd.ifq_maxlen = IFQ_MAXLEN; 197 if_attach(GIF2IFP(sc)); 198 bpfattach(GIF2IFP(sc), DLT_NULL, sizeof(u_int32_t)); 199 if (ng_gif_attach_p != NULL) 200 (*ng_gif_attach_p)(GIF2IFP(sc)); 201 202 mtx_lock(&gif_mtx); 203 LIST_INSERT_HEAD(&V_gif_softc_list, sc, gif_list); 204 mtx_unlock(&gif_mtx); 205 206 return (0); 207 } 208 209 static void 210 gif_clone_destroy(ifp) 211 struct ifnet *ifp; 212 { 213 #if defined(INET) || defined(INET6) 214 int err; 215 #endif 216 struct gif_softc *sc = ifp->if_softc; 217 218 mtx_lock(&gif_mtx); 219 LIST_REMOVE(sc, gif_list); 220 mtx_unlock(&gif_mtx); 221 222 gif_delete_tunnel(ifp); 223 #ifdef INET6 224 if (sc->encap_cookie6 != NULL) { 225 err = encap_detach(sc->encap_cookie6); 226 KASSERT(err == 0, ("Unexpected error detaching encap_cookie6")); 227 } 228 #endif 229 #ifdef INET 230 if (sc->encap_cookie4 != NULL) { 231 err = encap_detach(sc->encap_cookie4); 232 KASSERT(err == 0, ("Unexpected error detaching encap_cookie4")); 233 } 234 #endif 235 236 if (ng_gif_detach_p != NULL) 237 (*ng_gif_detach_p)(ifp); 238 bpfdetach(ifp); 239 if_detach(ifp); 240 if_free(ifp); 241 242 GIF_LOCK_DESTROY(sc); 243 244 free(sc, M_GIF); 245 } 246 247 static int 248 gifmodevent(mod, type, data) 249 module_t mod; 250 int type; 251 void *data; 252 { 253 254 switch (type) { 255 case MOD_LOAD: 256 mtx_init(&gif_mtx, "gif_mtx", NULL, MTX_DEF); 257 258 LIST_INIT(&V_gif_softc_list); 259 V_max_gif_nesting = MAX_GIF_NEST; 260 #ifdef XBONEHACK 261 V_parallel_tunnels = 1; 262 #else 263 V_parallel_tunnels = 0; 264 #endif 265 #ifdef INET 266 V_ip_gif_ttl = GIF_TTL; 267 #endif 268 #ifdef INET6 269 V_ip6_gif_hlim = GIF_HLIM; 270 #endif 271 if_clone_attach(&gif_cloner); 272 273 break; 274 case MOD_UNLOAD: 275 if_clone_detach(&gif_cloner); 276 mtx_destroy(&gif_mtx); 277 #ifdef INET6 278 V_ip6_gif_hlim = 0; 279 #endif 280 break; 281 default: 282 return EOPNOTSUPP; 283 } 284 return 0; 285 } 286 287 static moduledata_t gif_mod = { 288 "if_gif", 289 gifmodevent, 290 0 291 }; 292 293 DECLARE_MODULE(if_gif, gif_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 294 MODULE_VERSION(if_gif, 1); 295 296 int 297 gif_encapcheck(m, off, proto, arg) 298 const struct mbuf *m; 299 int off; 300 int proto; 301 void *arg; 302 { 303 struct ip ip; 304 struct gif_softc *sc; 305 306 sc = (struct gif_softc *)arg; 307 if (sc == NULL) 308 return 0; 309 310 if ((GIF2IFP(sc)->if_flags & IFF_UP) == 0) 311 return 0; 312 313 /* no physical address */ 314 if (!sc->gif_psrc || !sc->gif_pdst) 315 return 0; 316 317 switch (proto) { 318 #ifdef INET 319 case IPPROTO_IPV4: 320 break; 321 #endif 322 #ifdef INET6 323 case IPPROTO_IPV6: 324 break; 325 #endif 326 case IPPROTO_ETHERIP: 327 break; 328 329 default: 330 return 0; 331 } 332 333 /* Bail on short packets */ 334 if (m->m_pkthdr.len < sizeof(ip)) 335 return 0; 336 337 m_copydata(m, 0, sizeof(ip), (caddr_t)&ip); 338 339 switch (ip.ip_v) { 340 #ifdef INET 341 case 4: 342 if (sc->gif_psrc->sa_family != AF_INET || 343 sc->gif_pdst->sa_family != AF_INET) 344 return 0; 345 return gif_encapcheck4(m, off, proto, arg); 346 #endif 347 #ifdef INET6 348 case 6: 349 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) 350 return 0; 351 if (sc->gif_psrc->sa_family != AF_INET6 || 352 sc->gif_pdst->sa_family != AF_INET6) 353 return 0; 354 return gif_encapcheck6(m, off, proto, arg); 355 #endif 356 default: 357 return 0; 358 } 359 } 360 361 static void 362 gif_start(struct ifnet *ifp) 363 { 364 struct gif_softc *sc; 365 struct mbuf *m; 366 367 sc = ifp->if_softc; 368 369 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 370 for (;;) { 371 IFQ_DEQUEUE(&ifp->if_snd, m); 372 if (m == 0) 373 break; 374 375 gif_output(ifp, m, sc->gif_pdst, NULL); 376 377 } 378 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 379 380 return; 381 } 382 383 int 384 gif_output(ifp, m, dst, rt) 385 struct ifnet *ifp; 386 struct mbuf *m; 387 struct sockaddr *dst; 388 struct rtentry *rt; /* added in net2 */ 389 { 390 INIT_VNET_GIF(ifp->if_vnet); 391 struct gif_softc *sc = ifp->if_softc; 392 struct m_tag *mtag; 393 int error = 0; 394 int gif_called; 395 u_int32_t af; 396 397 #ifdef MAC 398 error = mac_ifnet_check_transmit(ifp, m); 399 if (error) { 400 m_freem(m); 401 goto end; 402 } 403 #endif 404 405 /* 406 * gif may cause infinite recursion calls when misconfigured. 407 * We'll prevent this by detecting loops. 408 * 409 * High nesting level may cause stack exhaustion. 410 * We'll prevent this by introducing upper limit. 411 */ 412 gif_called = 1; 413 mtag = m_tag_locate(m, MTAG_GIF, MTAG_GIF_CALLED, NULL); 414 while (mtag != NULL) { 415 if (*(struct ifnet **)(mtag + 1) == ifp) { 416 log(LOG_NOTICE, 417 "gif_output: loop detected on %s\n", 418 (*(struct ifnet **)(mtag + 1))->if_xname); 419 m_freem(m); 420 error = EIO; /* is there better errno? */ 421 goto end; 422 } 423 mtag = m_tag_locate(m, MTAG_GIF, MTAG_GIF_CALLED, mtag); 424 gif_called++; 425 } 426 if (gif_called > V_max_gif_nesting) { 427 log(LOG_NOTICE, 428 "gif_output: recursively called too many times(%d)\n", 429 gif_called); 430 m_freem(m); 431 error = EIO; /* is there better errno? */ 432 goto end; 433 } 434 mtag = m_tag_alloc(MTAG_GIF, MTAG_GIF_CALLED, sizeof(struct ifnet *), 435 M_NOWAIT); 436 if (mtag == NULL) { 437 m_freem(m); 438 error = ENOMEM; 439 goto end; 440 } 441 *(struct ifnet **)(mtag + 1) = ifp; 442 m_tag_prepend(m, mtag); 443 444 m->m_flags &= ~(M_BCAST|M_MCAST); 445 446 GIF_LOCK(sc); 447 448 if (!(ifp->if_flags & IFF_UP) || 449 sc->gif_psrc == NULL || sc->gif_pdst == NULL) { 450 GIF_UNLOCK(sc); 451 m_freem(m); 452 error = ENETDOWN; 453 goto end; 454 } 455 456 /* BPF writes need to be handled specially. */ 457 if (dst->sa_family == AF_UNSPEC) { 458 bcopy(dst->sa_data, &af, sizeof(af)); 459 dst->sa_family = af; 460 } 461 462 af = dst->sa_family; 463 BPF_MTAP2(ifp, &af, sizeof(af), m); 464 ifp->if_opackets++; 465 ifp->if_obytes += m->m_pkthdr.len; 466 467 /* override to IPPROTO_ETHERIP for bridged traffic */ 468 if (ifp->if_bridge) 469 af = AF_LINK; 470 471 M_SETFIB(m, sc->gif_fibnum); 472 /* inner AF-specific encapsulation */ 473 474 /* XXX should we check if our outer source is legal? */ 475 476 /* dispatch to output logic based on outer AF */ 477 switch (sc->gif_psrc->sa_family) { 478 #ifdef INET 479 case AF_INET: 480 error = in_gif_output(ifp, af, m); 481 break; 482 #endif 483 #ifdef INET6 484 case AF_INET6: 485 error = in6_gif_output(ifp, af, m); 486 break; 487 #endif 488 default: 489 m_freem(m); 490 error = ENETDOWN; 491 } 492 493 GIF_UNLOCK(sc); 494 end: 495 if (error) 496 ifp->if_oerrors++; 497 return (error); 498 } 499 500 void 501 gif_input(m, af, ifp) 502 struct mbuf *m; 503 int af; 504 struct ifnet *ifp; 505 { 506 int isr, n; 507 struct etherip_header *eip; 508 struct ether_header *eh; 509 struct ifnet *oldifp; 510 511 if (ifp == NULL) { 512 /* just in case */ 513 m_freem(m); 514 return; 515 } 516 517 m->m_pkthdr.rcvif = ifp; 518 519 #ifdef MAC 520 mac_ifnet_create_mbuf(ifp, m); 521 #endif 522 523 if (bpf_peers_present(ifp->if_bpf)) { 524 u_int32_t af1 = af; 525 bpf_mtap2(ifp->if_bpf, &af1, sizeof(af1), m); 526 } 527 528 if (ng_gif_input_p != NULL) { 529 (*ng_gif_input_p)(ifp, &m, af); 530 if (m == NULL) 531 return; 532 } 533 534 /* 535 * Put the packet to the network layer input queue according to the 536 * specified address family. 537 * Note: older versions of gif_input directly called network layer 538 * input functions, e.g. ip6_input, here. We changed the policy to 539 * prevent too many recursive calls of such input functions, which 540 * might cause kernel panic. But the change may introduce another 541 * problem; if the input queue is full, packets are discarded. 542 * The kernel stack overflow really happened, and we believed 543 * queue-full rarely occurs, so we changed the policy. 544 */ 545 switch (af) { 546 #ifdef INET 547 case AF_INET: 548 isr = NETISR_IP; 549 break; 550 #endif 551 #ifdef INET6 552 case AF_INET6: 553 isr = NETISR_IPV6; 554 break; 555 #endif 556 case AF_LINK: 557 n = sizeof(struct etherip_header) + sizeof(struct ether_header); 558 if (n > m->m_len) { 559 m = m_pullup(m, n); 560 if (m == NULL) { 561 ifp->if_ierrors++; 562 return; 563 } 564 } 565 566 eip = mtod(m, struct etherip_header *); 567 if (eip->eip_ver != 568 (ETHERIP_VERSION & ETHERIP_VER_VERS_MASK)) { 569 /* discard unknown versions */ 570 m_freem(m); 571 return; 572 } 573 m_adj(m, sizeof(struct etherip_header)); 574 575 m->m_flags &= ~(M_BCAST|M_MCAST); 576 m->m_pkthdr.rcvif = ifp; 577 578 if (ifp->if_bridge) { 579 oldifp = ifp; 580 eh = mtod(m, struct ether_header *); 581 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 582 if (ETHER_IS_BROADCAST(eh->ether_dhost)) 583 m->m_flags |= M_BCAST; 584 else 585 m->m_flags |= M_MCAST; 586 ifp->if_imcasts++; 587 } 588 BRIDGE_INPUT(ifp, m); 589 590 if (m != NULL && ifp != oldifp) { 591 /* 592 * The bridge gave us back itself or one of the 593 * members for which the frame is addressed. 594 */ 595 ether_demux(ifp, m); 596 return; 597 } 598 } 599 if (m != NULL) 600 m_freem(m); 601 return; 602 603 default: 604 if (ng_gif_input_orphan_p != NULL) 605 (*ng_gif_input_orphan_p)(ifp, m, af); 606 else 607 m_freem(m); 608 return; 609 } 610 611 ifp->if_ipackets++; 612 ifp->if_ibytes += m->m_pkthdr.len; 613 netisr_dispatch(isr, m); 614 } 615 616 /* XXX how should we handle IPv6 scope on SIOC[GS]IFPHYADDR? */ 617 int 618 gif_ioctl(ifp, cmd, data) 619 struct ifnet *ifp; 620 u_long cmd; 621 caddr_t data; 622 { 623 struct gif_softc *sc = ifp->if_softc; 624 struct ifreq *ifr = (struct ifreq*)data; 625 int error = 0, size; 626 struct sockaddr *dst, *src; 627 #ifdef SIOCSIFMTU /* xxx */ 628 u_long mtu; 629 #endif 630 631 switch (cmd) { 632 case SIOCSIFADDR: 633 ifp->if_flags |= IFF_UP; 634 break; 635 636 case SIOCSIFDSTADDR: 637 break; 638 639 case SIOCADDMULTI: 640 case SIOCDELMULTI: 641 break; 642 643 #ifdef SIOCSIFMTU /* xxx */ 644 case SIOCGIFMTU: 645 break; 646 647 case SIOCSIFMTU: 648 mtu = ifr->ifr_mtu; 649 if (mtu < GIF_MTU_MIN || mtu > GIF_MTU_MAX) 650 return (EINVAL); 651 ifp->if_mtu = mtu; 652 break; 653 #endif /* SIOCSIFMTU */ 654 655 #ifdef INET 656 case SIOCSIFPHYADDR: 657 #endif 658 #ifdef INET6 659 case SIOCSIFPHYADDR_IN6: 660 #endif /* INET6 */ 661 case SIOCSLIFPHYADDR: 662 switch (cmd) { 663 #ifdef INET 664 case SIOCSIFPHYADDR: 665 src = (struct sockaddr *) 666 &(((struct in_aliasreq *)data)->ifra_addr); 667 dst = (struct sockaddr *) 668 &(((struct in_aliasreq *)data)->ifra_dstaddr); 669 break; 670 #endif 671 #ifdef INET6 672 case SIOCSIFPHYADDR_IN6: 673 src = (struct sockaddr *) 674 &(((struct in6_aliasreq *)data)->ifra_addr); 675 dst = (struct sockaddr *) 676 &(((struct in6_aliasreq *)data)->ifra_dstaddr); 677 break; 678 #endif 679 case SIOCSLIFPHYADDR: 680 src = (struct sockaddr *) 681 &(((struct if_laddrreq *)data)->addr); 682 dst = (struct sockaddr *) 683 &(((struct if_laddrreq *)data)->dstaddr); 684 break; 685 default: 686 return EINVAL; 687 } 688 689 /* sa_family must be equal */ 690 if (src->sa_family != dst->sa_family) 691 return EINVAL; 692 693 /* validate sa_len */ 694 switch (src->sa_family) { 695 #ifdef INET 696 case AF_INET: 697 if (src->sa_len != sizeof(struct sockaddr_in)) 698 return EINVAL; 699 break; 700 #endif 701 #ifdef INET6 702 case AF_INET6: 703 if (src->sa_len != sizeof(struct sockaddr_in6)) 704 return EINVAL; 705 break; 706 #endif 707 default: 708 return EAFNOSUPPORT; 709 } 710 switch (dst->sa_family) { 711 #ifdef INET 712 case AF_INET: 713 if (dst->sa_len != sizeof(struct sockaddr_in)) 714 return EINVAL; 715 break; 716 #endif 717 #ifdef INET6 718 case AF_INET6: 719 if (dst->sa_len != sizeof(struct sockaddr_in6)) 720 return EINVAL; 721 break; 722 #endif 723 default: 724 return EAFNOSUPPORT; 725 } 726 727 /* check sa_family looks sane for the cmd */ 728 switch (cmd) { 729 case SIOCSIFPHYADDR: 730 if (src->sa_family == AF_INET) 731 break; 732 return EAFNOSUPPORT; 733 #ifdef INET6 734 case SIOCSIFPHYADDR_IN6: 735 if (src->sa_family == AF_INET6) 736 break; 737 return EAFNOSUPPORT; 738 #endif /* INET6 */ 739 case SIOCSLIFPHYADDR: 740 /* checks done in the above */ 741 break; 742 } 743 744 error = gif_set_tunnel(GIF2IFP(sc), src, dst); 745 break; 746 747 #ifdef SIOCDIFPHYADDR 748 case SIOCDIFPHYADDR: 749 gif_delete_tunnel(GIF2IFP(sc)); 750 break; 751 #endif 752 753 case SIOCGIFPSRCADDR: 754 #ifdef INET6 755 case SIOCGIFPSRCADDR_IN6: 756 #endif /* INET6 */ 757 if (sc->gif_psrc == NULL) { 758 error = EADDRNOTAVAIL; 759 goto bad; 760 } 761 src = sc->gif_psrc; 762 switch (cmd) { 763 #ifdef INET 764 case SIOCGIFPSRCADDR: 765 dst = &ifr->ifr_addr; 766 size = sizeof(ifr->ifr_addr); 767 break; 768 #endif /* INET */ 769 #ifdef INET6 770 case SIOCGIFPSRCADDR_IN6: 771 dst = (struct sockaddr *) 772 &(((struct in6_ifreq *)data)->ifr_addr); 773 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 774 break; 775 #endif /* INET6 */ 776 default: 777 error = EADDRNOTAVAIL; 778 goto bad; 779 } 780 if (src->sa_len > size) 781 return EINVAL; 782 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 783 #ifdef INET6 784 if (dst->sa_family == AF_INET6) { 785 error = sa6_recoverscope((struct sockaddr_in6 *)dst); 786 if (error != 0) 787 return (error); 788 } 789 #endif 790 break; 791 792 case SIOCGIFPDSTADDR: 793 #ifdef INET6 794 case SIOCGIFPDSTADDR_IN6: 795 #endif /* INET6 */ 796 if (sc->gif_pdst == NULL) { 797 error = EADDRNOTAVAIL; 798 goto bad; 799 } 800 src = sc->gif_pdst; 801 switch (cmd) { 802 #ifdef INET 803 case SIOCGIFPDSTADDR: 804 dst = &ifr->ifr_addr; 805 size = sizeof(ifr->ifr_addr); 806 break; 807 #endif /* INET */ 808 #ifdef INET6 809 case SIOCGIFPDSTADDR_IN6: 810 dst = (struct sockaddr *) 811 &(((struct in6_ifreq *)data)->ifr_addr); 812 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 813 break; 814 #endif /* INET6 */ 815 default: 816 error = EADDRNOTAVAIL; 817 goto bad; 818 } 819 if (src->sa_len > size) 820 return EINVAL; 821 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 822 #ifdef INET6 823 if (dst->sa_family == AF_INET6) { 824 error = sa6_recoverscope((struct sockaddr_in6 *)dst); 825 if (error != 0) 826 return (error); 827 } 828 #endif 829 break; 830 831 case SIOCGLIFPHYADDR: 832 if (sc->gif_psrc == NULL || sc->gif_pdst == NULL) { 833 error = EADDRNOTAVAIL; 834 goto bad; 835 } 836 837 /* copy src */ 838 src = sc->gif_psrc; 839 dst = (struct sockaddr *) 840 &(((struct if_laddrreq *)data)->addr); 841 size = sizeof(((struct if_laddrreq *)data)->addr); 842 if (src->sa_len > size) 843 return EINVAL; 844 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 845 846 /* copy dst */ 847 src = sc->gif_pdst; 848 dst = (struct sockaddr *) 849 &(((struct if_laddrreq *)data)->dstaddr); 850 size = sizeof(((struct if_laddrreq *)data)->dstaddr); 851 if (src->sa_len > size) 852 return EINVAL; 853 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 854 break; 855 856 case SIOCSIFFLAGS: 857 /* if_ioctl() takes care of it */ 858 break; 859 860 default: 861 error = EINVAL; 862 break; 863 } 864 bad: 865 return error; 866 } 867 868 /* 869 * XXXRW: There's a general event-ordering issue here: the code to check 870 * if a given tunnel is already present happens before we perform a 871 * potentially blocking setup of the tunnel. This code needs to be 872 * re-ordered so that the check and replacement can be atomic using 873 * a mutex. 874 */ 875 int 876 gif_set_tunnel(ifp, src, dst) 877 struct ifnet *ifp; 878 struct sockaddr *src; 879 struct sockaddr *dst; 880 { 881 INIT_VNET_GIF(ifp->if_vnet); 882 struct gif_softc *sc = ifp->if_softc; 883 struct gif_softc *sc2; 884 struct sockaddr *osrc, *odst, *sa; 885 int error = 0; 886 887 mtx_lock(&gif_mtx); 888 LIST_FOREACH(sc2, &V_gif_softc_list, gif_list) { 889 if (sc2 == sc) 890 continue; 891 if (!sc2->gif_pdst || !sc2->gif_psrc) 892 continue; 893 if (sc2->gif_pdst->sa_family != dst->sa_family || 894 sc2->gif_pdst->sa_len != dst->sa_len || 895 sc2->gif_psrc->sa_family != src->sa_family || 896 sc2->gif_psrc->sa_len != src->sa_len) 897 continue; 898 899 /* 900 * Disallow parallel tunnels unless instructed 901 * otherwise. 902 */ 903 if (!V_parallel_tunnels && 904 bcmp(sc2->gif_pdst, dst, dst->sa_len) == 0 && 905 bcmp(sc2->gif_psrc, src, src->sa_len) == 0) { 906 error = EADDRNOTAVAIL; 907 mtx_unlock(&gif_mtx); 908 goto bad; 909 } 910 911 /* XXX both end must be valid? (I mean, not 0.0.0.0) */ 912 } 913 mtx_unlock(&gif_mtx); 914 915 /* XXX we can detach from both, but be polite just in case */ 916 if (sc->gif_psrc) 917 switch (sc->gif_psrc->sa_family) { 918 #ifdef INET 919 case AF_INET: 920 (void)in_gif_detach(sc); 921 break; 922 #endif 923 #ifdef INET6 924 case AF_INET6: 925 (void)in6_gif_detach(sc); 926 break; 927 #endif 928 } 929 930 osrc = sc->gif_psrc; 931 sa = (struct sockaddr *)malloc(src->sa_len, M_IFADDR, M_WAITOK); 932 bcopy((caddr_t)src, (caddr_t)sa, src->sa_len); 933 sc->gif_psrc = sa; 934 935 odst = sc->gif_pdst; 936 sa = (struct sockaddr *)malloc(dst->sa_len, M_IFADDR, M_WAITOK); 937 bcopy((caddr_t)dst, (caddr_t)sa, dst->sa_len); 938 sc->gif_pdst = sa; 939 940 switch (sc->gif_psrc->sa_family) { 941 #ifdef INET 942 case AF_INET: 943 error = in_gif_attach(sc); 944 break; 945 #endif 946 #ifdef INET6 947 case AF_INET6: 948 /* 949 * Check validity of the scope zone ID of the addresses, and 950 * convert it into the kernel internal form if necessary. 951 */ 952 error = sa6_embedscope((struct sockaddr_in6 *)sc->gif_psrc, 0); 953 if (error != 0) 954 break; 955 error = sa6_embedscope((struct sockaddr_in6 *)sc->gif_pdst, 0); 956 if (error != 0) 957 break; 958 error = in6_gif_attach(sc); 959 break; 960 #endif 961 } 962 if (error) { 963 /* rollback */ 964 free((caddr_t)sc->gif_psrc, M_IFADDR); 965 free((caddr_t)sc->gif_pdst, M_IFADDR); 966 sc->gif_psrc = osrc; 967 sc->gif_pdst = odst; 968 goto bad; 969 } 970 971 if (osrc) 972 free((caddr_t)osrc, M_IFADDR); 973 if (odst) 974 free((caddr_t)odst, M_IFADDR); 975 976 bad: 977 if (sc->gif_psrc && sc->gif_pdst) 978 ifp->if_drv_flags |= IFF_DRV_RUNNING; 979 else 980 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 981 982 return error; 983 } 984 985 void 986 gif_delete_tunnel(ifp) 987 struct ifnet *ifp; 988 { 989 struct gif_softc *sc = ifp->if_softc; 990 991 if (sc->gif_psrc) { 992 free((caddr_t)sc->gif_psrc, M_IFADDR); 993 sc->gif_psrc = NULL; 994 } 995 if (sc->gif_pdst) { 996 free((caddr_t)sc->gif_pdst, M_IFADDR); 997 sc->gif_pdst = NULL; 998 } 999 /* it is safe to detach from both */ 1000 #ifdef INET 1001 (void)in_gif_detach(sc); 1002 #endif 1003 #ifdef INET6 1004 (void)in6_gif_detach(sc); 1005 #endif 1006 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1007 } 1008