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 *); 124 125 IFC_SIMPLE_DECLARE(gif, 0); 126 127 static int gifmodevent(module_t, int, void *); 128 129 SYSCTL_DECL(_net_link); 130 SYSCTL_NODE(_net_link, IFT_GIF, gif, CTLFLAG_RW, 0, 131 "Generic Tunnel Interface"); 132 #ifndef MAX_GIF_NEST 133 /* 134 * This macro controls the default upper limitation on nesting of gif tunnels. 135 * Since, setting a large value to this macro with a careless configuration 136 * may introduce system crash, we don't allow any nestings by default. 137 * If you need to configure nested gif tunnels, you can define this macro 138 * in your kernel configuration file. However, if you do so, please be 139 * careful to configure the tunnels so that it won't make a loop. 140 */ 141 #define MAX_GIF_NEST 1 142 #endif 143 SYSCTL_V_INT(V_NET, vnet_gif, _net_link_gif, OID_AUTO, max_nesting, 144 CTLFLAG_RW, max_gif_nesting, 0, "Max nested tunnels"); 145 146 #ifdef INET6 147 SYSCTL_DECL(_net_inet6_ip6); 148 SYSCTL_V_INT(V_NET, vnet_gif, _net_inet6_ip6, IPV6CTL_GIF_HLIM, 149 gifhlim, CTLFLAG_RW, ip6_gif_hlim, 0, ""); 150 #endif 151 152 /* 153 * By default, we disallow creation of multiple tunnels between the same 154 * pair of addresses. Some applications require this functionality so 155 * we allow control over this check here. 156 */ 157 SYSCTL_V_INT(V_NET, vnet_gif, _net_link_gif, OID_AUTO, parallel_tunnels, 158 CTLFLAG_RW, parallel_tunnels, 0, "Allow parallel tunnels?"); 159 160 /* copy from src/sys/net/if_ethersubr.c */ 161 static const u_char etherbroadcastaddr[ETHER_ADDR_LEN] = 162 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 163 #ifndef ETHER_IS_BROADCAST 164 #define ETHER_IS_BROADCAST(addr) \ 165 (bcmp(etherbroadcastaddr, (addr), ETHER_ADDR_LEN) == 0) 166 #endif 167 168 static int 169 gif_clone_create(ifc, unit, params) 170 struct if_clone *ifc; 171 int unit; 172 caddr_t params; 173 { 174 INIT_VNET_GIF(curvnet); 175 struct gif_softc *sc; 176 177 sc = malloc(sizeof(struct gif_softc), M_GIF, M_WAITOK | M_ZERO); 178 sc->gif_fibnum = curthread->td_proc->p_fibnum; 179 GIF2IFP(sc) = if_alloc(IFT_GIF); 180 if (GIF2IFP(sc) == NULL) { 181 free(sc, M_GIF); 182 return (ENOSPC); 183 } 184 185 GIF_LOCK_INIT(sc); 186 187 GIF2IFP(sc)->if_softc = sc; 188 if_initname(GIF2IFP(sc), ifc->ifc_name, unit); 189 190 sc->encap_cookie4 = sc->encap_cookie6 = NULL; 191 192 GIF2IFP(sc)->if_addrlen = 0; 193 GIF2IFP(sc)->if_mtu = GIF_MTU; 194 GIF2IFP(sc)->if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 195 #if 0 196 /* turn off ingress filter */ 197 GIF2IFP(sc)->if_flags |= IFF_LINK2; 198 #endif 199 GIF2IFP(sc)->if_ioctl = gif_ioctl; 200 GIF2IFP(sc)->if_start = gif_start; 201 GIF2IFP(sc)->if_output = gif_output; 202 GIF2IFP(sc)->if_snd.ifq_maxlen = IFQ_MAXLEN; 203 if_attach(GIF2IFP(sc)); 204 bpfattach(GIF2IFP(sc), DLT_NULL, sizeof(u_int32_t)); 205 if (ng_gif_attach_p != NULL) 206 (*ng_gif_attach_p)(GIF2IFP(sc)); 207 208 mtx_lock(&gif_mtx); 209 LIST_INSERT_HEAD(&V_gif_softc_list, sc, gif_list); 210 mtx_unlock(&gif_mtx); 211 212 return (0); 213 } 214 215 static void 216 gif_clone_destroy(ifp) 217 struct ifnet *ifp; 218 { 219 #if defined(INET) || defined(INET6) 220 int err; 221 #endif 222 struct gif_softc *sc = ifp->if_softc; 223 224 mtx_lock(&gif_mtx); 225 LIST_REMOVE(sc, gif_list); 226 mtx_unlock(&gif_mtx); 227 228 gif_delete_tunnel(ifp); 229 #ifdef INET6 230 if (sc->encap_cookie6 != NULL) { 231 err = encap_detach(sc->encap_cookie6); 232 KASSERT(err == 0, ("Unexpected error detaching encap_cookie6")); 233 } 234 #endif 235 #ifdef INET 236 if (sc->encap_cookie4 != NULL) { 237 err = encap_detach(sc->encap_cookie4); 238 KASSERT(err == 0, ("Unexpected error detaching encap_cookie4")); 239 } 240 #endif 241 242 if (ng_gif_detach_p != NULL) 243 (*ng_gif_detach_p)(ifp); 244 bpfdetach(ifp); 245 if_detach(ifp); 246 if_free(ifp); 247 248 GIF_LOCK_DESTROY(sc); 249 250 free(sc, M_GIF); 251 } 252 253 static int 254 gifmodevent(mod, type, data) 255 module_t mod; 256 int type; 257 void *data; 258 { 259 260 switch (type) { 261 case MOD_LOAD: 262 mtx_init(&gif_mtx, "gif_mtx", NULL, MTX_DEF); 263 264 LIST_INIT(&V_gif_softc_list); 265 V_max_gif_nesting = MAX_GIF_NEST; 266 #ifdef XBONEHACK 267 V_parallel_tunnels = 1; 268 #else 269 V_parallel_tunnels = 0; 270 #endif 271 #ifdef INET 272 V_ip_gif_ttl = GIF_TTL; 273 #endif 274 #ifdef INET6 275 V_ip6_gif_hlim = GIF_HLIM; 276 #endif 277 if_clone_attach(&gif_cloner); 278 279 break; 280 case MOD_UNLOAD: 281 if_clone_detach(&gif_cloner); 282 mtx_destroy(&gif_mtx); 283 #ifdef INET6 284 V_ip6_gif_hlim = 0; 285 #endif 286 break; 287 default: 288 return EOPNOTSUPP; 289 } 290 return 0; 291 } 292 293 static moduledata_t gif_mod = { 294 "if_gif", 295 gifmodevent, 296 0 297 }; 298 299 DECLARE_MODULE(if_gif, gif_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 300 MODULE_VERSION(if_gif, 1); 301 302 int 303 gif_encapcheck(m, off, proto, arg) 304 const struct mbuf *m; 305 int off; 306 int proto; 307 void *arg; 308 { 309 struct ip ip; 310 struct gif_softc *sc; 311 312 sc = (struct gif_softc *)arg; 313 if (sc == NULL) 314 return 0; 315 316 if ((GIF2IFP(sc)->if_flags & IFF_UP) == 0) 317 return 0; 318 319 /* no physical address */ 320 if (!sc->gif_psrc || !sc->gif_pdst) 321 return 0; 322 323 switch (proto) { 324 #ifdef INET 325 case IPPROTO_IPV4: 326 break; 327 #endif 328 #ifdef INET6 329 case IPPROTO_IPV6: 330 break; 331 #endif 332 case IPPROTO_ETHERIP: 333 break; 334 335 default: 336 return 0; 337 } 338 339 /* Bail on short packets */ 340 if (m->m_pkthdr.len < sizeof(ip)) 341 return 0; 342 343 m_copydata(m, 0, sizeof(ip), (caddr_t)&ip); 344 345 switch (ip.ip_v) { 346 #ifdef INET 347 case 4: 348 if (sc->gif_psrc->sa_family != AF_INET || 349 sc->gif_pdst->sa_family != AF_INET) 350 return 0; 351 return gif_encapcheck4(m, off, proto, arg); 352 #endif 353 #ifdef INET6 354 case 6: 355 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) 356 return 0; 357 if (sc->gif_psrc->sa_family != AF_INET6 || 358 sc->gif_pdst->sa_family != AF_INET6) 359 return 0; 360 return gif_encapcheck6(m, off, proto, arg); 361 #endif 362 default: 363 return 0; 364 } 365 } 366 367 static void 368 gif_start(struct ifnet *ifp) 369 { 370 struct gif_softc *sc; 371 struct mbuf *m; 372 373 sc = ifp->if_softc; 374 375 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 376 for (;;) { 377 IFQ_DEQUEUE(&ifp->if_snd, m); 378 if (m == 0) 379 break; 380 381 gif_output(ifp, m, sc->gif_pdst, NULL); 382 383 } 384 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 385 386 return; 387 } 388 389 int 390 gif_output(ifp, m, dst, rt) 391 struct ifnet *ifp; 392 struct mbuf *m; 393 struct sockaddr *dst; 394 struct rtentry *rt; /* added in net2 */ 395 { 396 INIT_VNET_GIF(ifp->if_vnet); 397 struct gif_softc *sc = ifp->if_softc; 398 struct m_tag *mtag; 399 int error = 0; 400 int gif_called; 401 u_int32_t af; 402 403 #ifdef MAC 404 error = mac_ifnet_check_transmit(ifp, m); 405 if (error) { 406 m_freem(m); 407 goto end; 408 } 409 #endif 410 411 /* 412 * gif may cause infinite recursion calls when misconfigured. 413 * We'll prevent this by detecting loops. 414 * 415 * High nesting level may cause stack exhaustion. 416 * We'll prevent this by introducing upper limit. 417 */ 418 gif_called = 1; 419 mtag = m_tag_locate(m, MTAG_GIF, MTAG_GIF_CALLED, NULL); 420 while (mtag != NULL) { 421 if (*(struct ifnet **)(mtag + 1) == ifp) { 422 log(LOG_NOTICE, 423 "gif_output: loop detected on %s\n", 424 (*(struct ifnet **)(mtag + 1))->if_xname); 425 m_freem(m); 426 error = EIO; /* is there better errno? */ 427 goto end; 428 } 429 mtag = m_tag_locate(m, MTAG_GIF, MTAG_GIF_CALLED, mtag); 430 gif_called++; 431 } 432 if (gif_called > V_max_gif_nesting) { 433 log(LOG_NOTICE, 434 "gif_output: recursively called too many times(%d)\n", 435 gif_called); 436 m_freem(m); 437 error = EIO; /* is there better errno? */ 438 goto end; 439 } 440 mtag = m_tag_alloc(MTAG_GIF, MTAG_GIF_CALLED, sizeof(struct ifnet *), 441 M_NOWAIT); 442 if (mtag == NULL) { 443 m_freem(m); 444 error = ENOMEM; 445 goto end; 446 } 447 *(struct ifnet **)(mtag + 1) = ifp; 448 m_tag_prepend(m, mtag); 449 450 m->m_flags &= ~(M_BCAST|M_MCAST); 451 452 GIF_LOCK(sc); 453 454 if (!(ifp->if_flags & IFF_UP) || 455 sc->gif_psrc == NULL || sc->gif_pdst == NULL) { 456 GIF_UNLOCK(sc); 457 m_freem(m); 458 error = ENETDOWN; 459 goto end; 460 } 461 462 /* BPF writes need to be handled specially. */ 463 if (dst->sa_family == AF_UNSPEC) { 464 bcopy(dst->sa_data, &af, sizeof(af)); 465 dst->sa_family = af; 466 } 467 468 af = dst->sa_family; 469 BPF_MTAP2(ifp, &af, sizeof(af), m); 470 ifp->if_opackets++; 471 ifp->if_obytes += m->m_pkthdr.len; 472 473 /* override to IPPROTO_ETHERIP for bridged traffic */ 474 if (ifp->if_bridge) 475 af = AF_LINK; 476 477 M_SETFIB(m, sc->gif_fibnum); 478 /* inner AF-specific encapsulation */ 479 480 /* XXX should we check if our outer source is legal? */ 481 482 /* dispatch to output logic based on outer AF */ 483 switch (sc->gif_psrc->sa_family) { 484 #ifdef INET 485 case AF_INET: 486 error = in_gif_output(ifp, af, m); 487 break; 488 #endif 489 #ifdef INET6 490 case AF_INET6: 491 error = in6_gif_output(ifp, af, m); 492 break; 493 #endif 494 default: 495 m_freem(m); 496 error = ENETDOWN; 497 } 498 499 GIF_UNLOCK(sc); 500 end: 501 if (error) 502 ifp->if_oerrors++; 503 return (error); 504 } 505 506 void 507 gif_input(m, af, ifp) 508 struct mbuf *m; 509 int af; 510 struct ifnet *ifp; 511 { 512 int isr, n; 513 struct etherip_header *eip; 514 struct ether_header *eh; 515 struct ifnet *oldifp; 516 517 if (ifp == NULL) { 518 /* just in case */ 519 m_freem(m); 520 return; 521 } 522 523 m->m_pkthdr.rcvif = ifp; 524 525 #ifdef MAC 526 mac_ifnet_create_mbuf(ifp, m); 527 #endif 528 529 if (bpf_peers_present(ifp->if_bpf)) { 530 u_int32_t af1 = af; 531 bpf_mtap2(ifp->if_bpf, &af1, sizeof(af1), m); 532 } 533 534 if (ng_gif_input_p != NULL) { 535 (*ng_gif_input_p)(ifp, &m, af); 536 if (m == NULL) 537 return; 538 } 539 540 /* 541 * Put the packet to the network layer input queue according to the 542 * specified address family. 543 * Note: older versions of gif_input directly called network layer 544 * input functions, e.g. ip6_input, here. We changed the policy to 545 * prevent too many recursive calls of such input functions, which 546 * might cause kernel panic. But the change may introduce another 547 * problem; if the input queue is full, packets are discarded. 548 * The kernel stack overflow really happened, and we believed 549 * queue-full rarely occurs, so we changed the policy. 550 */ 551 switch (af) { 552 #ifdef INET 553 case AF_INET: 554 isr = NETISR_IP; 555 break; 556 #endif 557 #ifdef INET6 558 case AF_INET6: 559 isr = NETISR_IPV6; 560 break; 561 #endif 562 case AF_LINK: 563 n = sizeof(struct etherip_header) + sizeof(struct ether_header); 564 if (n > m->m_len) { 565 m = m_pullup(m, n); 566 if (m == NULL) { 567 ifp->if_ierrors++; 568 return; 569 } 570 } 571 572 eip = mtod(m, struct etherip_header *); 573 if (eip->eip_ver != 574 (ETHERIP_VERSION & ETHERIP_VER_VERS_MASK)) { 575 /* discard unknown versions */ 576 m_freem(m); 577 return; 578 } 579 m_adj(m, sizeof(struct etherip_header)); 580 581 m->m_flags &= ~(M_BCAST|M_MCAST); 582 m->m_pkthdr.rcvif = ifp; 583 584 if (ifp->if_bridge) { 585 oldifp = ifp; 586 eh = mtod(m, struct ether_header *); 587 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 588 if (ETHER_IS_BROADCAST(eh->ether_dhost)) 589 m->m_flags |= M_BCAST; 590 else 591 m->m_flags |= M_MCAST; 592 ifp->if_imcasts++; 593 } 594 BRIDGE_INPUT(ifp, m); 595 596 if (m != NULL && ifp != oldifp) { 597 /* 598 * The bridge gave us back itself or one of the 599 * members for which the frame is addressed. 600 */ 601 ether_demux(ifp, m); 602 return; 603 } 604 } 605 if (m != NULL) 606 m_freem(m); 607 return; 608 609 default: 610 if (ng_gif_input_orphan_p != NULL) 611 (*ng_gif_input_orphan_p)(ifp, m, af); 612 else 613 m_freem(m); 614 return; 615 } 616 617 ifp->if_ipackets++; 618 ifp->if_ibytes += m->m_pkthdr.len; 619 netisr_dispatch(isr, m); 620 } 621 622 /* XXX how should we handle IPv6 scope on SIOC[GS]IFPHYADDR? */ 623 int 624 gif_ioctl(ifp, cmd, data) 625 struct ifnet *ifp; 626 u_long cmd; 627 caddr_t data; 628 { 629 struct gif_softc *sc = ifp->if_softc; 630 struct ifreq *ifr = (struct ifreq*)data; 631 int error = 0, size; 632 struct sockaddr *dst, *src; 633 #ifdef SIOCSIFMTU /* xxx */ 634 u_long mtu; 635 #endif 636 637 switch (cmd) { 638 case SIOCSIFADDR: 639 ifp->if_flags |= IFF_UP; 640 break; 641 642 case SIOCSIFDSTADDR: 643 break; 644 645 case SIOCADDMULTI: 646 case SIOCDELMULTI: 647 break; 648 649 #ifdef SIOCSIFMTU /* xxx */ 650 case SIOCGIFMTU: 651 break; 652 653 case SIOCSIFMTU: 654 mtu = ifr->ifr_mtu; 655 if (mtu < GIF_MTU_MIN || mtu > GIF_MTU_MAX) 656 return (EINVAL); 657 ifp->if_mtu = mtu; 658 break; 659 #endif /* SIOCSIFMTU */ 660 661 #ifdef INET 662 case SIOCSIFPHYADDR: 663 #endif 664 #ifdef INET6 665 case SIOCSIFPHYADDR_IN6: 666 #endif /* INET6 */ 667 case SIOCSLIFPHYADDR: 668 switch (cmd) { 669 #ifdef INET 670 case SIOCSIFPHYADDR: 671 src = (struct sockaddr *) 672 &(((struct in_aliasreq *)data)->ifra_addr); 673 dst = (struct sockaddr *) 674 &(((struct in_aliasreq *)data)->ifra_dstaddr); 675 break; 676 #endif 677 #ifdef INET6 678 case SIOCSIFPHYADDR_IN6: 679 src = (struct sockaddr *) 680 &(((struct in6_aliasreq *)data)->ifra_addr); 681 dst = (struct sockaddr *) 682 &(((struct in6_aliasreq *)data)->ifra_dstaddr); 683 break; 684 #endif 685 case SIOCSLIFPHYADDR: 686 src = (struct sockaddr *) 687 &(((struct if_laddrreq *)data)->addr); 688 dst = (struct sockaddr *) 689 &(((struct if_laddrreq *)data)->dstaddr); 690 break; 691 default: 692 return EINVAL; 693 } 694 695 /* sa_family must be equal */ 696 if (src->sa_family != dst->sa_family) 697 return EINVAL; 698 699 /* validate sa_len */ 700 switch (src->sa_family) { 701 #ifdef INET 702 case AF_INET: 703 if (src->sa_len != sizeof(struct sockaddr_in)) 704 return EINVAL; 705 break; 706 #endif 707 #ifdef INET6 708 case AF_INET6: 709 if (src->sa_len != sizeof(struct sockaddr_in6)) 710 return EINVAL; 711 break; 712 #endif 713 default: 714 return EAFNOSUPPORT; 715 } 716 switch (dst->sa_family) { 717 #ifdef INET 718 case AF_INET: 719 if (dst->sa_len != sizeof(struct sockaddr_in)) 720 return EINVAL; 721 break; 722 #endif 723 #ifdef INET6 724 case AF_INET6: 725 if (dst->sa_len != sizeof(struct sockaddr_in6)) 726 return EINVAL; 727 break; 728 #endif 729 default: 730 return EAFNOSUPPORT; 731 } 732 733 /* check sa_family looks sane for the cmd */ 734 switch (cmd) { 735 case SIOCSIFPHYADDR: 736 if (src->sa_family == AF_INET) 737 break; 738 return EAFNOSUPPORT; 739 #ifdef INET6 740 case SIOCSIFPHYADDR_IN6: 741 if (src->sa_family == AF_INET6) 742 break; 743 return EAFNOSUPPORT; 744 #endif /* INET6 */ 745 case SIOCSLIFPHYADDR: 746 /* checks done in the above */ 747 break; 748 } 749 750 error = gif_set_tunnel(GIF2IFP(sc), src, dst); 751 break; 752 753 #ifdef SIOCDIFPHYADDR 754 case SIOCDIFPHYADDR: 755 gif_delete_tunnel(GIF2IFP(sc)); 756 break; 757 #endif 758 759 case SIOCGIFPSRCADDR: 760 #ifdef INET6 761 case SIOCGIFPSRCADDR_IN6: 762 #endif /* INET6 */ 763 if (sc->gif_psrc == NULL) { 764 error = EADDRNOTAVAIL; 765 goto bad; 766 } 767 src = sc->gif_psrc; 768 switch (cmd) { 769 #ifdef INET 770 case SIOCGIFPSRCADDR: 771 dst = &ifr->ifr_addr; 772 size = sizeof(ifr->ifr_addr); 773 break; 774 #endif /* INET */ 775 #ifdef INET6 776 case SIOCGIFPSRCADDR_IN6: 777 dst = (struct sockaddr *) 778 &(((struct in6_ifreq *)data)->ifr_addr); 779 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 780 break; 781 #endif /* INET6 */ 782 default: 783 error = EADDRNOTAVAIL; 784 goto bad; 785 } 786 if (src->sa_len > size) 787 return EINVAL; 788 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 789 #ifdef INET6 790 if (dst->sa_family == AF_INET6) { 791 error = sa6_recoverscope((struct sockaddr_in6 *)dst); 792 if (error != 0) 793 return (error); 794 } 795 #endif 796 break; 797 798 case SIOCGIFPDSTADDR: 799 #ifdef INET6 800 case SIOCGIFPDSTADDR_IN6: 801 #endif /* INET6 */ 802 if (sc->gif_pdst == NULL) { 803 error = EADDRNOTAVAIL; 804 goto bad; 805 } 806 src = sc->gif_pdst; 807 switch (cmd) { 808 #ifdef INET 809 case SIOCGIFPDSTADDR: 810 dst = &ifr->ifr_addr; 811 size = sizeof(ifr->ifr_addr); 812 break; 813 #endif /* INET */ 814 #ifdef INET6 815 case SIOCGIFPDSTADDR_IN6: 816 dst = (struct sockaddr *) 817 &(((struct in6_ifreq *)data)->ifr_addr); 818 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 819 break; 820 #endif /* INET6 */ 821 default: 822 error = EADDRNOTAVAIL; 823 goto bad; 824 } 825 if (src->sa_len > size) 826 return EINVAL; 827 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 828 #ifdef INET6 829 if (dst->sa_family == AF_INET6) { 830 error = sa6_recoverscope((struct sockaddr_in6 *)dst); 831 if (error != 0) 832 return (error); 833 } 834 #endif 835 break; 836 837 case SIOCGLIFPHYADDR: 838 if (sc->gif_psrc == NULL || sc->gif_pdst == NULL) { 839 error = EADDRNOTAVAIL; 840 goto bad; 841 } 842 843 /* copy src */ 844 src = sc->gif_psrc; 845 dst = (struct sockaddr *) 846 &(((struct if_laddrreq *)data)->addr); 847 size = sizeof(((struct if_laddrreq *)data)->addr); 848 if (src->sa_len > size) 849 return EINVAL; 850 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 851 852 /* copy dst */ 853 src = sc->gif_pdst; 854 dst = (struct sockaddr *) 855 &(((struct if_laddrreq *)data)->dstaddr); 856 size = sizeof(((struct if_laddrreq *)data)->dstaddr); 857 if (src->sa_len > size) 858 return EINVAL; 859 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 860 break; 861 862 case SIOCSIFFLAGS: 863 /* if_ioctl() takes care of it */ 864 break; 865 866 default: 867 error = EINVAL; 868 break; 869 } 870 bad: 871 return error; 872 } 873 874 /* 875 * XXXRW: There's a general event-ordering issue here: the code to check 876 * if a given tunnel is already present happens before we perform a 877 * potentially blocking setup of the tunnel. This code needs to be 878 * re-ordered so that the check and replacement can be atomic using 879 * a mutex. 880 */ 881 int 882 gif_set_tunnel(ifp, src, dst) 883 struct ifnet *ifp; 884 struct sockaddr *src; 885 struct sockaddr *dst; 886 { 887 INIT_VNET_GIF(ifp->if_vnet); 888 struct gif_softc *sc = ifp->if_softc; 889 struct gif_softc *sc2; 890 struct sockaddr *osrc, *odst, *sa; 891 int error = 0; 892 893 mtx_lock(&gif_mtx); 894 LIST_FOREACH(sc2, &V_gif_softc_list, gif_list) { 895 if (sc2 == sc) 896 continue; 897 if (!sc2->gif_pdst || !sc2->gif_psrc) 898 continue; 899 if (sc2->gif_pdst->sa_family != dst->sa_family || 900 sc2->gif_pdst->sa_len != dst->sa_len || 901 sc2->gif_psrc->sa_family != src->sa_family || 902 sc2->gif_psrc->sa_len != src->sa_len) 903 continue; 904 905 /* 906 * Disallow parallel tunnels unless instructed 907 * otherwise. 908 */ 909 if (!V_parallel_tunnels && 910 bcmp(sc2->gif_pdst, dst, dst->sa_len) == 0 && 911 bcmp(sc2->gif_psrc, src, src->sa_len) == 0) { 912 error = EADDRNOTAVAIL; 913 mtx_unlock(&gif_mtx); 914 goto bad; 915 } 916 917 /* XXX both end must be valid? (I mean, not 0.0.0.0) */ 918 } 919 mtx_unlock(&gif_mtx); 920 921 /* XXX we can detach from both, but be polite just in case */ 922 if (sc->gif_psrc) 923 switch (sc->gif_psrc->sa_family) { 924 #ifdef INET 925 case AF_INET: 926 (void)in_gif_detach(sc); 927 break; 928 #endif 929 #ifdef INET6 930 case AF_INET6: 931 (void)in6_gif_detach(sc); 932 break; 933 #endif 934 } 935 936 osrc = sc->gif_psrc; 937 sa = (struct sockaddr *)malloc(src->sa_len, M_IFADDR, M_WAITOK); 938 bcopy((caddr_t)src, (caddr_t)sa, src->sa_len); 939 sc->gif_psrc = sa; 940 941 odst = sc->gif_pdst; 942 sa = (struct sockaddr *)malloc(dst->sa_len, M_IFADDR, M_WAITOK); 943 bcopy((caddr_t)dst, (caddr_t)sa, dst->sa_len); 944 sc->gif_pdst = sa; 945 946 switch (sc->gif_psrc->sa_family) { 947 #ifdef INET 948 case AF_INET: 949 error = in_gif_attach(sc); 950 break; 951 #endif 952 #ifdef INET6 953 case AF_INET6: 954 /* 955 * Check validity of the scope zone ID of the addresses, and 956 * convert it into the kernel internal form if necessary. 957 */ 958 error = sa6_embedscope((struct sockaddr_in6 *)sc->gif_psrc, 0); 959 if (error != 0) 960 break; 961 error = sa6_embedscope((struct sockaddr_in6 *)sc->gif_pdst, 0); 962 if (error != 0) 963 break; 964 error = in6_gif_attach(sc); 965 break; 966 #endif 967 } 968 if (error) { 969 /* rollback */ 970 free((caddr_t)sc->gif_psrc, M_IFADDR); 971 free((caddr_t)sc->gif_pdst, M_IFADDR); 972 sc->gif_psrc = osrc; 973 sc->gif_pdst = odst; 974 goto bad; 975 } 976 977 if (osrc) 978 free((caddr_t)osrc, M_IFADDR); 979 if (odst) 980 free((caddr_t)odst, M_IFADDR); 981 982 bad: 983 if (sc->gif_psrc && sc->gif_pdst) 984 ifp->if_drv_flags |= IFF_DRV_RUNNING; 985 else 986 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 987 988 return error; 989 } 990 991 void 992 gif_delete_tunnel(ifp) 993 struct ifnet *ifp; 994 { 995 struct gif_softc *sc = ifp->if_softc; 996 997 if (sc->gif_psrc) { 998 free((caddr_t)sc->gif_psrc, M_IFADDR); 999 sc->gif_psrc = NULL; 1000 } 1001 if (sc->gif_pdst) { 1002 free((caddr_t)sc->gif_pdst, M_IFADDR); 1003 sc->gif_pdst = NULL; 1004 } 1005 /* it is safe to detach from both */ 1006 #ifdef INET 1007 (void)in_gif_detach(sc); 1008 #endif 1009 #ifdef INET6 1010 (void)in6_gif_detach(sc); 1011 #endif 1012 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1013 } 1014