if_gif.c revision 195727
1/* $FreeBSD: head/sys/net/if_gif.c 195727 2009-07-16 21:13:04Z rwatson $ */ 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/priv.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 */ 95static struct mtx gif_mtx; 96static MALLOC_DEFINE(M_GIF, "gif", "Generic Tunnel Interface"); 97 98static VNET_DEFINE(LIST_HEAD(, gif_softc), gif_softc_list); 99static VNET_DEFINE(int, max_gif_nesting); 100static VNET_DEFINE(int, parallel_tunnels); 101 102#define V_gif_softc_list VNET(gif_softc_list) 103#define V_max_gif_nesting VNET(max_gif_nesting) 104#define V_parallel_tunnels VNET(parallel_tunnels) 105 106#ifdef INET 107VNET_DEFINE(int, ip_gif_ttl); 108#define V_ip_gif_ttl VNET(ip_gif_ttl) 109#endif 110#ifdef INET6 111VNET_DEFINE(int, ip6_gif_hlim); 112#define V_ip6_gif_hlim VNET(ip6_gif_hlim) 113#endif 114 115void (*ng_gif_input_p)(struct ifnet *ifp, struct mbuf **mp, int af); 116void (*ng_gif_input_orphan_p)(struct ifnet *ifp, struct mbuf *m, int af); 117void (*ng_gif_attach_p)(struct ifnet *ifp); 118void (*ng_gif_detach_p)(struct ifnet *ifp); 119 120static void gif_start(struct ifnet *); 121static int gif_clone_create(struct if_clone *, int, caddr_t); 122static void gif_clone_destroy(struct ifnet *); 123static int vnet_gif_iattach(const void *); 124 125#ifdef VIMAGE 126static const vnet_modinfo_t vnet_gif_modinfo = { 127 .vmi_id = VNET_MOD_GIF, 128 .vmi_name = "gif", 129 .vmi_dependson = VNET_MOD_NET, 130 .vmi_iattach = vnet_gif_iattach 131}; 132#endif 133 134IFC_SIMPLE_DECLARE(gif, 0); 135 136static int gifmodevent(module_t, int, void *); 137 138SYSCTL_DECL(_net_link); 139SYSCTL_NODE(_net_link, IFT_GIF, gif, CTLFLAG_RW, 0, 140 "Generic Tunnel Interface"); 141#ifndef MAX_GIF_NEST 142/* 143 * This macro controls the default upper limitation on nesting of gif tunnels. 144 * Since, setting a large value to this macro with a careless configuration 145 * may introduce system crash, we don't allow any nestings by default. 146 * If you need to configure nested gif tunnels, you can define this macro 147 * in your kernel configuration file. However, if you do so, please be 148 * careful to configure the tunnels so that it won't make a loop. 149 */ 150#define MAX_GIF_NEST 1 151#endif 152SYSCTL_VNET_INT(_net_link_gif, OID_AUTO, max_nesting, CTLFLAG_RW, 153 &VNET_NAME(max_gif_nesting), 0, "Max nested tunnels"); 154 155#ifdef INET6 156SYSCTL_DECL(_net_inet6_ip6); 157SYSCTL_VNET_INT(_net_inet6_ip6, IPV6CTL_GIF_HLIM, gifhlim, CTLFLAG_RW, 158 &VNET_NAME(ip6_gif_hlim), 0, ""); 159#endif 160 161/* 162 * By default, we disallow creation of multiple tunnels between the same 163 * pair of addresses. Some applications require this functionality so 164 * we allow control over this check here. 165 */ 166SYSCTL_VNET_INT(_net_link_gif, OID_AUTO, parallel_tunnels, CTLFLAG_RW, 167 &VNET_NAME(parallel_tunnels), 0, "Allow parallel tunnels?"); 168 169/* copy from src/sys/net/if_ethersubr.c */ 170static const u_char etherbroadcastaddr[ETHER_ADDR_LEN] = 171 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 172#ifndef ETHER_IS_BROADCAST 173#define ETHER_IS_BROADCAST(addr) \ 174 (bcmp(etherbroadcastaddr, (addr), ETHER_ADDR_LEN) == 0) 175#endif 176 177static int 178gif_clone_create(ifc, unit, params) 179 struct if_clone *ifc; 180 int unit; 181 caddr_t params; 182{ 183 struct gif_softc *sc; 184 185 sc = malloc(sizeof(struct gif_softc), M_GIF, M_WAITOK | M_ZERO); 186 sc->gif_fibnum = curthread->td_proc->p_fibnum; 187 GIF2IFP(sc) = if_alloc(IFT_GIF); 188 if (GIF2IFP(sc) == NULL) { 189 free(sc, M_GIF); 190 return (ENOSPC); 191 } 192 193 GIF_LOCK_INIT(sc); 194 195 GIF2IFP(sc)->if_softc = sc; 196 if_initname(GIF2IFP(sc), ifc->ifc_name, unit); 197 198 sc->encap_cookie4 = sc->encap_cookie6 = NULL; 199 sc->gif_options = GIF_ACCEPT_REVETHIP; 200 201 GIF2IFP(sc)->if_addrlen = 0; 202 GIF2IFP(sc)->if_mtu = GIF_MTU; 203 GIF2IFP(sc)->if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 204#if 0 205 /* turn off ingress filter */ 206 GIF2IFP(sc)->if_flags |= IFF_LINK2; 207#endif 208 GIF2IFP(sc)->if_ioctl = gif_ioctl; 209 GIF2IFP(sc)->if_start = gif_start; 210 GIF2IFP(sc)->if_output = gif_output; 211 GIF2IFP(sc)->if_snd.ifq_maxlen = IFQ_MAXLEN; 212 if_attach(GIF2IFP(sc)); 213 bpfattach(GIF2IFP(sc), DLT_NULL, sizeof(u_int32_t)); 214 if (ng_gif_attach_p != NULL) 215 (*ng_gif_attach_p)(GIF2IFP(sc)); 216 217 mtx_lock(&gif_mtx); 218 LIST_INSERT_HEAD(&V_gif_softc_list, sc, gif_list); 219 mtx_unlock(&gif_mtx); 220 221 return (0); 222} 223 224static void 225gif_clone_destroy(ifp) 226 struct ifnet *ifp; 227{ 228#if defined(INET) || defined(INET6) 229 int err; 230#endif 231 struct gif_softc *sc = ifp->if_softc; 232 233 mtx_lock(&gif_mtx); 234 LIST_REMOVE(sc, gif_list); 235 mtx_unlock(&gif_mtx); 236 237 gif_delete_tunnel(ifp); 238#ifdef INET6 239 if (sc->encap_cookie6 != NULL) { 240 err = encap_detach(sc->encap_cookie6); 241 KASSERT(err == 0, ("Unexpected error detaching encap_cookie6")); 242 } 243#endif 244#ifdef INET 245 if (sc->encap_cookie4 != NULL) { 246 err = encap_detach(sc->encap_cookie4); 247 KASSERT(err == 0, ("Unexpected error detaching encap_cookie4")); 248 } 249#endif 250 251 if (ng_gif_detach_p != NULL) 252 (*ng_gif_detach_p)(ifp); 253 bpfdetach(ifp); 254 if_detach(ifp); 255 if_free(ifp); 256 257 GIF_LOCK_DESTROY(sc); 258 259 free(sc, M_GIF); 260} 261 262static int 263vnet_gif_iattach(const void *unused __unused) 264{ 265 266 LIST_INIT(&V_gif_softc_list); 267 V_max_gif_nesting = MAX_GIF_NEST; 268#ifdef XBONEHACK 269 V_parallel_tunnels = 1; 270#else 271 V_parallel_tunnels = 0; 272#endif 273#ifdef INET 274 V_ip_gif_ttl = GIF_TTL; 275#endif 276#ifdef INET6 277 V_ip6_gif_hlim = GIF_HLIM; 278#endif 279 280 return (0); 281} 282 283static int 284gifmodevent(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#ifdef VIMAGE 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#ifdef VIMAGE 305 vnet_mod_deregister(&vnet_gif_modinfo); 306#endif 307 mtx_destroy(&gif_mtx); 308 break; 309 default: 310 return EOPNOTSUPP; 311 } 312 return 0; 313} 314 315static moduledata_t gif_mod = { 316 "if_gif", 317 gifmodevent, 318 0 319}; 320 321DECLARE_MODULE(if_gif, gif_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 322MODULE_VERSION(if_gif, 1); 323 324int 325gif_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 389static void 390gif_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 411int 412gif_output(ifp, m, dst, ro) 413 struct ifnet *ifp; 414 struct mbuf *m; 415 struct sockaddr *dst; 416 struct route *ro; 417{ 418 struct gif_softc *sc = ifp->if_softc; 419 struct m_tag *mtag; 420 int error = 0; 421 int gif_called; 422 u_int32_t af; 423 424#ifdef MAC 425 error = mac_ifnet_check_transmit(ifp, m); 426 if (error) { 427 m_freem(m); 428 goto end; 429 } 430#endif 431 432 /* 433 * gif may cause infinite recursion calls when misconfigured. 434 * We'll prevent this by detecting loops. 435 * 436 * High nesting level may cause stack exhaustion. 437 * We'll prevent this by introducing upper limit. 438 */ 439 gif_called = 1; 440 mtag = m_tag_locate(m, MTAG_GIF, MTAG_GIF_CALLED, NULL); 441 while (mtag != NULL) { 442 if (*(struct ifnet **)(mtag + 1) == ifp) { 443 log(LOG_NOTICE, 444 "gif_output: loop detected on %s\n", 445 (*(struct ifnet **)(mtag + 1))->if_xname); 446 m_freem(m); 447 error = EIO; /* is there better errno? */ 448 goto end; 449 } 450 mtag = m_tag_locate(m, MTAG_GIF, MTAG_GIF_CALLED, mtag); 451 gif_called++; 452 } 453 if (gif_called > V_max_gif_nesting) { 454 log(LOG_NOTICE, 455 "gif_output: recursively called too many times(%d)\n", 456 gif_called); 457 m_freem(m); 458 error = EIO; /* is there better errno? */ 459 goto end; 460 } 461 mtag = m_tag_alloc(MTAG_GIF, MTAG_GIF_CALLED, sizeof(struct ifnet *), 462 M_NOWAIT); 463 if (mtag == NULL) { 464 m_freem(m); 465 error = ENOMEM; 466 goto end; 467 } 468 *(struct ifnet **)(mtag + 1) = ifp; 469 m_tag_prepend(m, mtag); 470 471 m->m_flags &= ~(M_BCAST|M_MCAST); 472 473 GIF_LOCK(sc); 474 475 if (!(ifp->if_flags & IFF_UP) || 476 sc->gif_psrc == NULL || sc->gif_pdst == NULL) { 477 GIF_UNLOCK(sc); 478 m_freem(m); 479 error = ENETDOWN; 480 goto end; 481 } 482 483 /* BPF writes need to be handled specially. */ 484 if (dst->sa_family == AF_UNSPEC) { 485 bcopy(dst->sa_data, &af, sizeof(af)); 486 dst->sa_family = af; 487 } 488 489 af = dst->sa_family; 490 BPF_MTAP2(ifp, &af, sizeof(af), m); 491 ifp->if_opackets++; 492 ifp->if_obytes += m->m_pkthdr.len; 493 494 /* override to IPPROTO_ETHERIP for bridged traffic */ 495 if (ifp->if_bridge) 496 af = AF_LINK; 497 498 M_SETFIB(m, sc->gif_fibnum); 499 /* inner AF-specific encapsulation */ 500 501 /* XXX should we check if our outer source is legal? */ 502 503 /* dispatch to output logic based on outer AF */ 504 switch (sc->gif_psrc->sa_family) { 505#ifdef INET 506 case AF_INET: 507 error = in_gif_output(ifp, af, m); 508 break; 509#endif 510#ifdef INET6 511 case AF_INET6: 512 error = in6_gif_output(ifp, af, m); 513 break; 514#endif 515 default: 516 m_freem(m); 517 error = ENETDOWN; 518 } 519 520 GIF_UNLOCK(sc); 521 end: 522 if (error) 523 ifp->if_oerrors++; 524 return (error); 525} 526 527void 528gif_input(m, af, ifp) 529 struct mbuf *m; 530 int af; 531 struct ifnet *ifp; 532{ 533 int isr, n; 534 struct gif_softc *sc = ifp->if_softc; 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 /* 596 * GIF_ACCEPT_REVETHIP (enabled by default) intentionally 597 * accepts an EtherIP packet with revered version field in 598 * the header. This is a knob for backward compatibility 599 * with FreeBSD 7.2R or prior. 600 */ 601 if (sc->gif_options & GIF_ACCEPT_REVETHIP) { 602 if (eip->eip_resvl != ETHERIP_VERSION 603 && eip->eip_ver != ETHERIP_VERSION) { 604 /* discard unknown versions */ 605 m_freem(m); 606 return; 607 } 608 } else { 609 if (eip->eip_ver != ETHERIP_VERSION) { 610 /* discard unknown versions */ 611 m_freem(m); 612 return; 613 } 614 } 615 m_adj(m, sizeof(struct etherip_header)); 616 617 m->m_flags &= ~(M_BCAST|M_MCAST); 618 m->m_pkthdr.rcvif = ifp; 619 620 if (ifp->if_bridge) { 621 oldifp = ifp; 622 eh = mtod(m, struct ether_header *); 623 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 624 if (ETHER_IS_BROADCAST(eh->ether_dhost)) 625 m->m_flags |= M_BCAST; 626 else 627 m->m_flags |= M_MCAST; 628 ifp->if_imcasts++; 629 } 630 BRIDGE_INPUT(ifp, m); 631 632 if (m != NULL && ifp != oldifp) { 633 /* 634 * The bridge gave us back itself or one of the 635 * members for which the frame is addressed. 636 */ 637 ether_demux(ifp, m); 638 return; 639 } 640 } 641 if (m != NULL) 642 m_freem(m); 643 return; 644 645 default: 646 if (ng_gif_input_orphan_p != NULL) 647 (*ng_gif_input_orphan_p)(ifp, m, af); 648 else 649 m_freem(m); 650 return; 651 } 652 653 ifp->if_ipackets++; 654 ifp->if_ibytes += m->m_pkthdr.len; 655 netisr_dispatch(isr, m); 656} 657 658/* XXX how should we handle IPv6 scope on SIOC[GS]IFPHYADDR? */ 659int 660gif_ioctl(ifp, cmd, data) 661 struct ifnet *ifp; 662 u_long cmd; 663 caddr_t data; 664{ 665 struct gif_softc *sc = ifp->if_softc; 666 struct ifreq *ifr = (struct ifreq*)data; 667 int error = 0, size; 668 u_int options; 669 struct sockaddr *dst, *src; 670#ifdef SIOCSIFMTU /* xxx */ 671 u_long mtu; 672#endif 673 674 switch (cmd) { 675 case SIOCSIFADDR: 676 ifp->if_flags |= IFF_UP; 677 break; 678 679 case SIOCSIFDSTADDR: 680 break; 681 682 case SIOCADDMULTI: 683 case SIOCDELMULTI: 684 break; 685 686#ifdef SIOCSIFMTU /* xxx */ 687 case SIOCGIFMTU: 688 break; 689 690 case SIOCSIFMTU: 691 mtu = ifr->ifr_mtu; 692 if (mtu < GIF_MTU_MIN || mtu > GIF_MTU_MAX) 693 return (EINVAL); 694 ifp->if_mtu = mtu; 695 break; 696#endif /* SIOCSIFMTU */ 697 698#ifdef INET 699 case SIOCSIFPHYADDR: 700#endif 701#ifdef INET6 702 case SIOCSIFPHYADDR_IN6: 703#endif /* INET6 */ 704 case SIOCSLIFPHYADDR: 705 switch (cmd) { 706#ifdef INET 707 case SIOCSIFPHYADDR: 708 src = (struct sockaddr *) 709 &(((struct in_aliasreq *)data)->ifra_addr); 710 dst = (struct sockaddr *) 711 &(((struct in_aliasreq *)data)->ifra_dstaddr); 712 break; 713#endif 714#ifdef INET6 715 case SIOCSIFPHYADDR_IN6: 716 src = (struct sockaddr *) 717 &(((struct in6_aliasreq *)data)->ifra_addr); 718 dst = (struct sockaddr *) 719 &(((struct in6_aliasreq *)data)->ifra_dstaddr); 720 break; 721#endif 722 case SIOCSLIFPHYADDR: 723 src = (struct sockaddr *) 724 &(((struct if_laddrreq *)data)->addr); 725 dst = (struct sockaddr *) 726 &(((struct if_laddrreq *)data)->dstaddr); 727 break; 728 default: 729 return EINVAL; 730 } 731 732 /* sa_family must be equal */ 733 if (src->sa_family != dst->sa_family) 734 return EINVAL; 735 736 /* validate sa_len */ 737 switch (src->sa_family) { 738#ifdef INET 739 case AF_INET: 740 if (src->sa_len != sizeof(struct sockaddr_in)) 741 return EINVAL; 742 break; 743#endif 744#ifdef INET6 745 case AF_INET6: 746 if (src->sa_len != sizeof(struct sockaddr_in6)) 747 return EINVAL; 748 break; 749#endif 750 default: 751 return EAFNOSUPPORT; 752 } 753 switch (dst->sa_family) { 754#ifdef INET 755 case AF_INET: 756 if (dst->sa_len != sizeof(struct sockaddr_in)) 757 return EINVAL; 758 break; 759#endif 760#ifdef INET6 761 case AF_INET6: 762 if (dst->sa_len != sizeof(struct sockaddr_in6)) 763 return EINVAL; 764 break; 765#endif 766 default: 767 return EAFNOSUPPORT; 768 } 769 770 /* check sa_family looks sane for the cmd */ 771 switch (cmd) { 772 case SIOCSIFPHYADDR: 773 if (src->sa_family == AF_INET) 774 break; 775 return EAFNOSUPPORT; 776#ifdef INET6 777 case SIOCSIFPHYADDR_IN6: 778 if (src->sa_family == AF_INET6) 779 break; 780 return EAFNOSUPPORT; 781#endif /* INET6 */ 782 case SIOCSLIFPHYADDR: 783 /* checks done in the above */ 784 break; 785 } 786 787 error = gif_set_tunnel(GIF2IFP(sc), src, dst); 788 break; 789 790#ifdef SIOCDIFPHYADDR 791 case SIOCDIFPHYADDR: 792 gif_delete_tunnel(GIF2IFP(sc)); 793 break; 794#endif 795 796 case SIOCGIFPSRCADDR: 797#ifdef INET6 798 case SIOCGIFPSRCADDR_IN6: 799#endif /* INET6 */ 800 if (sc->gif_psrc == NULL) { 801 error = EADDRNOTAVAIL; 802 goto bad; 803 } 804 src = sc->gif_psrc; 805 switch (cmd) { 806#ifdef INET 807 case SIOCGIFPSRCADDR: 808 dst = &ifr->ifr_addr; 809 size = sizeof(ifr->ifr_addr); 810 break; 811#endif /* INET */ 812#ifdef INET6 813 case SIOCGIFPSRCADDR_IN6: 814 dst = (struct sockaddr *) 815 &(((struct in6_ifreq *)data)->ifr_addr); 816 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 817 break; 818#endif /* INET6 */ 819 default: 820 error = EADDRNOTAVAIL; 821 goto bad; 822 } 823 if (src->sa_len > size) 824 return EINVAL; 825 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 826#ifdef INET6 827 if (dst->sa_family == AF_INET6) { 828 error = sa6_recoverscope((struct sockaddr_in6 *)dst); 829 if (error != 0) 830 return (error); 831 } 832#endif 833 break; 834 835 case SIOCGIFPDSTADDR: 836#ifdef INET6 837 case SIOCGIFPDSTADDR_IN6: 838#endif /* INET6 */ 839 if (sc->gif_pdst == NULL) { 840 error = EADDRNOTAVAIL; 841 goto bad; 842 } 843 src = sc->gif_pdst; 844 switch (cmd) { 845#ifdef INET 846 case SIOCGIFPDSTADDR: 847 dst = &ifr->ifr_addr; 848 size = sizeof(ifr->ifr_addr); 849 break; 850#endif /* INET */ 851#ifdef INET6 852 case SIOCGIFPDSTADDR_IN6: 853 dst = (struct sockaddr *) 854 &(((struct in6_ifreq *)data)->ifr_addr); 855 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 856 break; 857#endif /* INET6 */ 858 default: 859 error = EADDRNOTAVAIL; 860 goto bad; 861 } 862 if (src->sa_len > size) 863 return EINVAL; 864 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 865#ifdef INET6 866 if (dst->sa_family == AF_INET6) { 867 error = sa6_recoverscope((struct sockaddr_in6 *)dst); 868 if (error != 0) 869 return (error); 870 } 871#endif 872 break; 873 874 case SIOCGLIFPHYADDR: 875 if (sc->gif_psrc == NULL || sc->gif_pdst == NULL) { 876 error = EADDRNOTAVAIL; 877 goto bad; 878 } 879 880 /* copy src */ 881 src = sc->gif_psrc; 882 dst = (struct sockaddr *) 883 &(((struct if_laddrreq *)data)->addr); 884 size = sizeof(((struct if_laddrreq *)data)->addr); 885 if (src->sa_len > size) 886 return EINVAL; 887 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 888 889 /* copy dst */ 890 src = sc->gif_pdst; 891 dst = (struct sockaddr *) 892 &(((struct if_laddrreq *)data)->dstaddr); 893 size = sizeof(((struct if_laddrreq *)data)->dstaddr); 894 if (src->sa_len > size) 895 return EINVAL; 896 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 897 break; 898 899 case SIOCSIFFLAGS: 900 /* if_ioctl() takes care of it */ 901 break; 902 903 case GIFGOPTS: 904 options = sc->gif_options; 905 error = copyout(&options, ifr->ifr_data, 906 sizeof(options)); 907 break; 908 909 case GIFSOPTS: 910 if ((error = priv_check(curthread, PRIV_NET_GIF)) != 0) 911 break; 912 error = copyin(ifr->ifr_data, &options, sizeof(options)); 913 if (error) 914 break; 915 if (options & ~GIF_OPTMASK) 916 error = EINVAL; 917 else 918 sc->gif_options = options; 919 break; 920 921 default: 922 error = EINVAL; 923 break; 924 } 925 bad: 926 return error; 927} 928 929/* 930 * XXXRW: There's a general event-ordering issue here: the code to check 931 * if a given tunnel is already present happens before we perform a 932 * potentially blocking setup of the tunnel. This code needs to be 933 * re-ordered so that the check and replacement can be atomic using 934 * a mutex. 935 */ 936int 937gif_set_tunnel(ifp, src, dst) 938 struct ifnet *ifp; 939 struct sockaddr *src; 940 struct sockaddr *dst; 941{ 942 struct gif_softc *sc = ifp->if_softc; 943 struct gif_softc *sc2; 944 struct sockaddr *osrc, *odst, *sa; 945 int error = 0; 946 947 mtx_lock(&gif_mtx); 948 LIST_FOREACH(sc2, &V_gif_softc_list, gif_list) { 949 if (sc2 == sc) 950 continue; 951 if (!sc2->gif_pdst || !sc2->gif_psrc) 952 continue; 953 if (sc2->gif_pdst->sa_family != dst->sa_family || 954 sc2->gif_pdst->sa_len != dst->sa_len || 955 sc2->gif_psrc->sa_family != src->sa_family || 956 sc2->gif_psrc->sa_len != src->sa_len) 957 continue; 958 959 /* 960 * Disallow parallel tunnels unless instructed 961 * otherwise. 962 */ 963 if (!V_parallel_tunnels && 964 bcmp(sc2->gif_pdst, dst, dst->sa_len) == 0 && 965 bcmp(sc2->gif_psrc, src, src->sa_len) == 0) { 966 error = EADDRNOTAVAIL; 967 mtx_unlock(&gif_mtx); 968 goto bad; 969 } 970 971 /* XXX both end must be valid? (I mean, not 0.0.0.0) */ 972 } 973 mtx_unlock(&gif_mtx); 974 975 /* XXX we can detach from both, but be polite just in case */ 976 if (sc->gif_psrc) 977 switch (sc->gif_psrc->sa_family) { 978#ifdef INET 979 case AF_INET: 980 (void)in_gif_detach(sc); 981 break; 982#endif 983#ifdef INET6 984 case AF_INET6: 985 (void)in6_gif_detach(sc); 986 break; 987#endif 988 } 989 990 osrc = sc->gif_psrc; 991 sa = (struct sockaddr *)malloc(src->sa_len, M_IFADDR, M_WAITOK); 992 bcopy((caddr_t)src, (caddr_t)sa, src->sa_len); 993 sc->gif_psrc = sa; 994 995 odst = sc->gif_pdst; 996 sa = (struct sockaddr *)malloc(dst->sa_len, M_IFADDR, M_WAITOK); 997 bcopy((caddr_t)dst, (caddr_t)sa, dst->sa_len); 998 sc->gif_pdst = sa; 999 1000 switch (sc->gif_psrc->sa_family) { 1001#ifdef INET 1002 case AF_INET: 1003 error = in_gif_attach(sc); 1004 break; 1005#endif 1006#ifdef INET6 1007 case AF_INET6: 1008 /* 1009 * Check validity of the scope zone ID of the addresses, and 1010 * convert it into the kernel internal form if necessary. 1011 */ 1012 error = sa6_embedscope((struct sockaddr_in6 *)sc->gif_psrc, 0); 1013 if (error != 0) 1014 break; 1015 error = sa6_embedscope((struct sockaddr_in6 *)sc->gif_pdst, 0); 1016 if (error != 0) 1017 break; 1018 error = in6_gif_attach(sc); 1019 break; 1020#endif 1021 } 1022 if (error) { 1023 /* rollback */ 1024 free((caddr_t)sc->gif_psrc, M_IFADDR); 1025 free((caddr_t)sc->gif_pdst, M_IFADDR); 1026 sc->gif_psrc = osrc; 1027 sc->gif_pdst = odst; 1028 goto bad; 1029 } 1030 1031 if (osrc) 1032 free((caddr_t)osrc, M_IFADDR); 1033 if (odst) 1034 free((caddr_t)odst, M_IFADDR); 1035 1036 bad: 1037 if (sc->gif_psrc && sc->gif_pdst) 1038 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1039 else 1040 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1041 1042 return error; 1043} 1044 1045void 1046gif_delete_tunnel(ifp) 1047 struct ifnet *ifp; 1048{ 1049 struct gif_softc *sc = ifp->if_softc; 1050 1051 if (sc->gif_psrc) { 1052 free((caddr_t)sc->gif_psrc, M_IFADDR); 1053 sc->gif_psrc = NULL; 1054 } 1055 if (sc->gif_pdst) { 1056 free((caddr_t)sc->gif_pdst, M_IFADDR); 1057 sc->gif_pdst = NULL; 1058 } 1059 /* it is safe to detach from both */ 1060#ifdef INET 1061 (void)in_gif_detach(sc); 1062#endif 1063#ifdef INET6 1064 (void)in6_gif_detach(sc); 1065#endif 1066 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1067} 1068