if_gif.c revision 249925
1/* $FreeBSD: head/sys/net/if_gif.c 249925 2013-04-26 12:50:32Z glebius $ */ 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/jail.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/priv.h> 50#include <sys/proc.h> 51#include <sys/protosw.h> 52#include <sys/conf.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#include <net/vnet.h> 62 63#include <netinet/in.h> 64#include <netinet/in_systm.h> 65#include <netinet/ip.h> 66#ifdef INET 67#include <netinet/in_var.h> 68#include <netinet/in_gif.h> 69#include <netinet/ip_var.h> 70#endif /* INET */ 71 72#ifdef INET6 73#ifndef INET 74#include <netinet/in.h> 75#endif 76#include <netinet6/in6_var.h> 77#include <netinet/ip6.h> 78#include <netinet6/ip6_var.h> 79#include <netinet6/scope6_var.h> 80#include <netinet6/in6_gif.h> 81#include <netinet6/ip6protosw.h> 82#endif /* INET6 */ 83 84#include <netinet/ip_encap.h> 85#include <net/ethernet.h> 86#include <net/if_bridgevar.h> 87#include <net/if_gif.h> 88 89#include <security/mac/mac_framework.h> 90 91static const char gifname[] = "gif"; 92 93/* 94 * gif_mtx protects the global gif_softc_list. 95 */ 96static struct mtx gif_mtx; 97static MALLOC_DEFINE(M_GIF, "gif", "Generic Tunnel Interface"); 98static VNET_DEFINE(LIST_HEAD(, gif_softc), gif_softc_list); 99#define V_gif_softc_list VNET(gif_softc_list) 100 101void (*ng_gif_input_p)(struct ifnet *ifp, struct mbuf **mp, int af); 102void (*ng_gif_input_orphan_p)(struct ifnet *ifp, struct mbuf *m, int af); 103void (*ng_gif_attach_p)(struct ifnet *ifp); 104void (*ng_gif_detach_p)(struct ifnet *ifp); 105 106static void gif_start(struct ifnet *); 107static int gif_clone_create(struct if_clone *, int, caddr_t); 108static void gif_clone_destroy(struct ifnet *); 109static struct if_clone *gif_cloner; 110 111static int gifmodevent(module_t, int, void *); 112 113SYSCTL_DECL(_net_link); 114static SYSCTL_NODE(_net_link, IFT_GIF, gif, CTLFLAG_RW, 0, 115 "Generic Tunnel Interface"); 116#ifndef MAX_GIF_NEST 117/* 118 * This macro controls the default upper limitation on nesting of gif tunnels. 119 * Since, setting a large value to this macro with a careless configuration 120 * may introduce system crash, we don't allow any nestings by default. 121 * If you need to configure nested gif tunnels, you can define this macro 122 * in your kernel configuration file. However, if you do so, please be 123 * careful to configure the tunnels so that it won't make a loop. 124 */ 125#define MAX_GIF_NEST 1 126#endif 127static VNET_DEFINE(int, max_gif_nesting) = MAX_GIF_NEST; 128#define V_max_gif_nesting VNET(max_gif_nesting) 129SYSCTL_VNET_INT(_net_link_gif, OID_AUTO, max_nesting, CTLFLAG_RW, 130 &VNET_NAME(max_gif_nesting), 0, "Max nested tunnels"); 131 132/* 133 * By default, we disallow creation of multiple tunnels between the same 134 * pair of addresses. Some applications require this functionality so 135 * we allow control over this check here. 136 */ 137#ifdef XBONEHACK 138static VNET_DEFINE(int, parallel_tunnels) = 1; 139#else 140static VNET_DEFINE(int, parallel_tunnels) = 0; 141#endif 142#define V_parallel_tunnels VNET(parallel_tunnels) 143SYSCTL_VNET_INT(_net_link_gif, OID_AUTO, parallel_tunnels, CTLFLAG_RW, 144 &VNET_NAME(parallel_tunnels), 0, "Allow parallel tunnels?"); 145 146/* copy from src/sys/net/if_ethersubr.c */ 147static const u_char etherbroadcastaddr[ETHER_ADDR_LEN] = 148 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 149#ifndef ETHER_IS_BROADCAST 150#define ETHER_IS_BROADCAST(addr) \ 151 (bcmp(etherbroadcastaddr, (addr), ETHER_ADDR_LEN) == 0) 152#endif 153 154static int 155gif_clone_create(ifc, unit, params) 156 struct if_clone *ifc; 157 int unit; 158 caddr_t params; 159{ 160 struct gif_softc *sc; 161 162 sc = malloc(sizeof(struct gif_softc), M_GIF, M_WAITOK | M_ZERO); 163 sc->gif_fibnum = curthread->td_proc->p_fibnum; 164 GIF2IFP(sc) = if_alloc(IFT_GIF); 165 if (GIF2IFP(sc) == NULL) { 166 free(sc, M_GIF); 167 return (ENOSPC); 168 } 169 170 GIF_LOCK_INIT(sc); 171 172 GIF2IFP(sc)->if_softc = sc; 173 if_initname(GIF2IFP(sc), gifname, unit); 174 175 sc->encap_cookie4 = sc->encap_cookie6 = NULL; 176 sc->gif_options = GIF_ACCEPT_REVETHIP; 177 178 GIF2IFP(sc)->if_addrlen = 0; 179 GIF2IFP(sc)->if_mtu = GIF_MTU; 180 GIF2IFP(sc)->if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 181#if 0 182 /* turn off ingress filter */ 183 GIF2IFP(sc)->if_flags |= IFF_LINK2; 184#endif 185 GIF2IFP(sc)->if_ioctl = gif_ioctl; 186 GIF2IFP(sc)->if_start = gif_start; 187 GIF2IFP(sc)->if_output = gif_output; 188 GIF2IFP(sc)->if_snd.ifq_maxlen = ifqmaxlen; 189 if_attach(GIF2IFP(sc)); 190 bpfattach(GIF2IFP(sc), DLT_NULL, sizeof(u_int32_t)); 191 if (ng_gif_attach_p != NULL) 192 (*ng_gif_attach_p)(GIF2IFP(sc)); 193 194 mtx_lock(&gif_mtx); 195 LIST_INSERT_HEAD(&V_gif_softc_list, sc, gif_list); 196 mtx_unlock(&gif_mtx); 197 198 return (0); 199} 200 201static void 202gif_clone_destroy(ifp) 203 struct ifnet *ifp; 204{ 205#if defined(INET) || defined(INET6) 206 int err; 207#endif 208 struct gif_softc *sc = ifp->if_softc; 209 210 mtx_lock(&gif_mtx); 211 LIST_REMOVE(sc, gif_list); 212 mtx_unlock(&gif_mtx); 213 214 gif_delete_tunnel(ifp); 215#ifdef INET6 216 if (sc->encap_cookie6 != NULL) { 217 err = encap_detach(sc->encap_cookie6); 218 KASSERT(err == 0, ("Unexpected error detaching encap_cookie6")); 219 } 220#endif 221#ifdef INET 222 if (sc->encap_cookie4 != NULL) { 223 err = encap_detach(sc->encap_cookie4); 224 KASSERT(err == 0, ("Unexpected error detaching encap_cookie4")); 225 } 226#endif 227 228 if (ng_gif_detach_p != NULL) 229 (*ng_gif_detach_p)(ifp); 230 bpfdetach(ifp); 231 if_detach(ifp); 232 if_free(ifp); 233 234 GIF_LOCK_DESTROY(sc); 235 236 free(sc, M_GIF); 237} 238 239static void 240vnet_gif_init(const void *unused __unused) 241{ 242 243 LIST_INIT(&V_gif_softc_list); 244} 245VNET_SYSINIT(vnet_gif_init, SI_SUB_PSEUDO, SI_ORDER_MIDDLE, vnet_gif_init, 246 NULL); 247 248static int 249gifmodevent(mod, type, data) 250 module_t mod; 251 int type; 252 void *data; 253{ 254 255 switch (type) { 256 case MOD_LOAD: 257 mtx_init(&gif_mtx, "gif_mtx", NULL, MTX_DEF); 258 gif_cloner = if_clone_simple(gifname, gif_clone_create, 259 gif_clone_destroy, 0); 260 break; 261 262 case MOD_UNLOAD: 263 if_clone_detach(gif_cloner); 264 mtx_destroy(&gif_mtx); 265 break; 266 default: 267 return EOPNOTSUPP; 268 } 269 return 0; 270} 271 272static moduledata_t gif_mod = { 273 "if_gif", 274 gifmodevent, 275 0 276}; 277 278DECLARE_MODULE(if_gif, gif_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 279MODULE_VERSION(if_gif, 1); 280 281int 282gif_encapcheck(m, off, proto, arg) 283 const struct mbuf *m; 284 int off; 285 int proto; 286 void *arg; 287{ 288 struct ip ip; 289 struct gif_softc *sc; 290 291 sc = (struct gif_softc *)arg; 292 if (sc == NULL) 293 return 0; 294 295 if ((GIF2IFP(sc)->if_flags & IFF_UP) == 0) 296 return 0; 297 298 /* no physical address */ 299 if (!sc->gif_psrc || !sc->gif_pdst) 300 return 0; 301 302 switch (proto) { 303#ifdef INET 304 case IPPROTO_IPV4: 305 break; 306#endif 307#ifdef INET6 308 case IPPROTO_IPV6: 309 break; 310#endif 311 case IPPROTO_ETHERIP: 312 break; 313 314 default: 315 return 0; 316 } 317 318 /* Bail on short packets */ 319 if (m->m_pkthdr.len < sizeof(ip)) 320 return 0; 321 322 m_copydata(m, 0, sizeof(ip), (caddr_t)&ip); 323 324 switch (ip.ip_v) { 325#ifdef INET 326 case 4: 327 if (sc->gif_psrc->sa_family != AF_INET || 328 sc->gif_pdst->sa_family != AF_INET) 329 return 0; 330 return gif_encapcheck4(m, off, proto, arg); 331#endif 332#ifdef INET6 333 case 6: 334 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) 335 return 0; 336 if (sc->gif_psrc->sa_family != AF_INET6 || 337 sc->gif_pdst->sa_family != AF_INET6) 338 return 0; 339 return gif_encapcheck6(m, off, proto, arg); 340#endif 341 default: 342 return 0; 343 } 344} 345#ifdef INET 346#define GIF_HDR_LEN (ETHER_HDR_LEN + sizeof (struct ip)) 347#endif 348#ifdef INET6 349#define GIF_HDR_LEN6 (ETHER_HDR_LEN + sizeof (struct ip6_hdr)) 350#endif 351 352static void 353gif_start(struct ifnet *ifp) 354{ 355 struct gif_softc *sc; 356 struct mbuf *m; 357 uint32_t af; 358 int error = 0; 359 360 sc = ifp->if_softc; 361 GIF_LOCK(sc); 362 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 363 while (!IFQ_DRV_IS_EMPTY(&ifp->if_snd)) { 364 365 IFQ_DRV_DEQUEUE(&ifp->if_snd, m); 366 if (m == 0) 367 break; 368 369#ifdef ALTQ 370 /* Take out those altq bytes we add in gif_output */ 371#ifdef INET 372 if (sc->gif_psrc->sa_family == AF_INET) 373 m->m_pkthdr.len -= GIF_HDR_LEN; 374#endif 375#ifdef INET6 376 if (sc->gif_psrc->sa_family == AF_INET6) 377 m->m_pkthdr.len -= GIF_HDR_LEN6; 378#endif 379#endif 380 /* 381 * Now pull back the af that we 382 * stashed in the csum_data. 383 */ 384 af = m->m_pkthdr.csum_data; 385 386 if (ifp->if_bridge) 387 af = AF_LINK; 388 389 BPF_MTAP2(ifp, &af, sizeof(af), m); 390 ifp->if_opackets++; 391 392/* Done by IFQ_HANDOFF */ 393/* ifp->if_obytes += m->m_pkthdr.len;*/ 394 /* override to IPPROTO_ETHERIP for bridged traffic */ 395 396 M_SETFIB(m, sc->gif_fibnum); 397 /* inner AF-specific encapsulation */ 398 /* XXX should we check if our outer source is legal? */ 399 /* dispatch to output logic based on outer AF */ 400 switch (sc->gif_psrc->sa_family) { 401#ifdef INET 402 case AF_INET: 403 error = in_gif_output(ifp, af, m); 404 break; 405#endif 406#ifdef INET6 407 case AF_INET6: 408 error = in6_gif_output(ifp, af, m); 409 break; 410#endif 411 default: 412 m_freem(m); 413 error = ENETDOWN; 414 } 415 if (error) 416 ifp->if_oerrors++; 417 418 } 419 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 420 GIF_UNLOCK(sc); 421 return; 422} 423 424int 425gif_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 426 struct route *ro) 427{ 428 struct gif_softc *sc = ifp->if_softc; 429 struct m_tag *mtag; 430 int error = 0; 431 int gif_called; 432 uint32_t af; 433#ifdef MAC 434 error = mac_ifnet_check_transmit(ifp, m); 435 if (error) { 436 m_freem(m); 437 goto end; 438 } 439#endif 440 441 /* 442 * gif may cause infinite recursion calls when misconfigured. 443 * We'll prevent this by detecting loops. 444 * 445 * High nesting level may cause stack exhaustion. 446 * We'll prevent this by introducing upper limit. 447 */ 448 gif_called = 1; 449 mtag = m_tag_locate(m, MTAG_GIF, MTAG_GIF_CALLED, NULL); 450 while (mtag != NULL) { 451 if (*(struct ifnet **)(mtag + 1) == ifp) { 452 log(LOG_NOTICE, 453 "gif_output: loop detected on %s\n", 454 (*(struct ifnet **)(mtag + 1))->if_xname); 455 m_freem(m); 456 error = EIO; /* is there better errno? */ 457 goto end; 458 } 459 mtag = m_tag_locate(m, MTAG_GIF, MTAG_GIF_CALLED, mtag); 460 gif_called++; 461 } 462 if (gif_called > V_max_gif_nesting) { 463 log(LOG_NOTICE, 464 "gif_output: recursively called too many times(%d)\n", 465 gif_called); 466 m_freem(m); 467 error = EIO; /* is there better errno? */ 468 goto end; 469 } 470 mtag = m_tag_alloc(MTAG_GIF, MTAG_GIF_CALLED, sizeof(struct ifnet *), 471 M_NOWAIT); 472 if (mtag == NULL) { 473 m_freem(m); 474 error = ENOMEM; 475 goto end; 476 } 477 *(struct ifnet **)(mtag + 1) = ifp; 478 m_tag_prepend(m, mtag); 479 480 m->m_flags &= ~(M_BCAST|M_MCAST); 481 /* BPF writes need to be handled specially. */ 482 if (dst->sa_family == AF_UNSPEC) 483 bcopy(dst->sa_data, &af, sizeof(af)); 484 else 485 af = dst->sa_family; 486 /* 487 * Now save the af in the inbound pkt csum 488 * data, this is a cheat since we are using 489 * the inbound csum_data field to carry the 490 * af over to the gif_start() routine, avoiding 491 * using yet another mtag. 492 */ 493 m->m_pkthdr.csum_data = af; 494 if (!(ifp->if_flags & IFF_UP) || 495 sc->gif_psrc == NULL || sc->gif_pdst == NULL) { 496 m_freem(m); 497 error = ENETDOWN; 498 goto end; 499 } 500#ifdef ALTQ 501 /* 502 * Make altq aware of the bytes we will add 503 * when we actually send it. 504 */ 505#ifdef INET 506 if (sc->gif_psrc->sa_family == AF_INET) 507 m->m_pkthdr.len += GIF_HDR_LEN; 508#endif 509#ifdef INET6 510 if (sc->gif_psrc->sa_family == AF_INET6) 511 m->m_pkthdr.len += GIF_HDR_LEN6; 512#endif 513#endif 514 /* 515 * Queue message on interface, update output statistics if 516 * successful, and start output if interface not yet active. 517 */ 518 IFQ_HANDOFF(ifp, m, error); 519 end: 520 if (error) 521 ifp->if_oerrors++; 522 return (error); 523} 524 525void 526gif_input(m, af, ifp) 527 struct mbuf *m; 528 int af; 529 struct ifnet *ifp; 530{ 531 int isr, n; 532 struct gif_softc *sc; 533 struct etherip_header *eip; 534 struct ether_header *eh; 535 struct ifnet *oldifp; 536 537 if (ifp == NULL) { 538 /* just in case */ 539 m_freem(m); 540 return; 541 } 542 sc = ifp->if_softc; 543 m->m_pkthdr.rcvif = ifp; 544 545#ifdef MAC 546 mac_ifnet_create_mbuf(ifp, m); 547#endif 548 549 if (bpf_peers_present(ifp->if_bpf)) { 550 u_int32_t af1 = af; 551 bpf_mtap2(ifp->if_bpf, &af1, sizeof(af1), m); 552 } 553 554 if (ng_gif_input_p != NULL) { 555 (*ng_gif_input_p)(ifp, &m, af); 556 if (m == NULL) 557 return; 558 } 559 560 /* 561 * Put the packet to the network layer input queue according to the 562 * specified address family. 563 * Note: older versions of gif_input directly called network layer 564 * input functions, e.g. ip6_input, here. We changed the policy to 565 * prevent too many recursive calls of such input functions, which 566 * might cause kernel panic. But the change may introduce another 567 * problem; if the input queue is full, packets are discarded. 568 * The kernel stack overflow really happened, and we believed 569 * queue-full rarely occurs, so we changed the policy. 570 */ 571 switch (af) { 572#ifdef INET 573 case AF_INET: 574 isr = NETISR_IP; 575 break; 576#endif 577#ifdef INET6 578 case AF_INET6: 579 isr = NETISR_IPV6; 580 break; 581#endif 582 case AF_LINK: 583 n = sizeof(struct etherip_header) + sizeof(struct ether_header); 584 if (n > m->m_len) { 585 m = m_pullup(m, n); 586 if (m == NULL) { 587 ifp->if_ierrors++; 588 return; 589 } 590 } 591 592 eip = mtod(m, struct etherip_header *); 593 /* 594 * GIF_ACCEPT_REVETHIP (enabled by default) intentionally 595 * accepts an EtherIP packet with revered version field in 596 * the header. This is a knob for backward compatibility 597 * with FreeBSD 7.2R or prior. 598 */ 599 if (sc->gif_options & GIF_ACCEPT_REVETHIP) { 600 if (eip->eip_resvl != ETHERIP_VERSION 601 && eip->eip_ver != ETHERIP_VERSION) { 602 /* discard unknown versions */ 603 m_freem(m); 604 return; 605 } 606 } else { 607 if (eip->eip_ver != ETHERIP_VERSION) { 608 /* discard unknown versions */ 609 m_freem(m); 610 return; 611 } 612 } 613 m_adj(m, sizeof(struct etherip_header)); 614 615 m->m_flags &= ~(M_BCAST|M_MCAST); 616 m->m_pkthdr.rcvif = ifp; 617 618 if (ifp->if_bridge) { 619 oldifp = ifp; 620 eh = mtod(m, struct ether_header *); 621 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 622 if (ETHER_IS_BROADCAST(eh->ether_dhost)) 623 m->m_flags |= M_BCAST; 624 else 625 m->m_flags |= M_MCAST; 626 ifp->if_imcasts++; 627 } 628 BRIDGE_INPUT(ifp, m); 629 630 if (m != NULL && ifp != oldifp) { 631 /* 632 * The bridge gave us back itself or one of the 633 * members for which the frame is addressed. 634 */ 635 ether_demux(ifp, m); 636 return; 637 } 638 } 639 if (m != NULL) 640 m_freem(m); 641 return; 642 643 default: 644 if (ng_gif_input_orphan_p != NULL) 645 (*ng_gif_input_orphan_p)(ifp, m, af); 646 else 647 m_freem(m); 648 return; 649 } 650 651 ifp->if_ipackets++; 652 ifp->if_ibytes += m->m_pkthdr.len; 653 M_SETFIB(m, ifp->if_fib); 654 netisr_dispatch(isr, m); 655} 656 657/* XXX how should we handle IPv6 scope on SIOC[GS]IFPHYADDR? */ 658int 659gif_ioctl(ifp, cmd, data) 660 struct ifnet *ifp; 661 u_long cmd; 662 caddr_t data; 663{ 664 struct gif_softc *sc = ifp->if_softc; 665 struct ifreq *ifr = (struct ifreq*)data; 666 int error = 0, size; 667 u_int options; 668 struct sockaddr *dst, *src; 669#ifdef SIOCSIFMTU /* xxx */ 670 u_long mtu; 671#endif 672 673 switch (cmd) { 674 case SIOCSIFADDR: 675 ifp->if_flags |= IFF_UP; 676 break; 677 678 case SIOCSIFDSTADDR: 679 break; 680 681 case SIOCADDMULTI: 682 case SIOCDELMULTI: 683 break; 684 685#ifdef SIOCSIFMTU /* xxx */ 686 case SIOCGIFMTU: 687 break; 688 689 case SIOCSIFMTU: 690 mtu = ifr->ifr_mtu; 691 if (mtu < GIF_MTU_MIN || mtu > GIF_MTU_MAX) 692 return (EINVAL); 693 ifp->if_mtu = mtu; 694 break; 695#endif /* SIOCSIFMTU */ 696 697#ifdef INET 698 case SIOCSIFPHYADDR: 699#endif 700#ifdef INET6 701 case SIOCSIFPHYADDR_IN6: 702#endif /* INET6 */ 703 case SIOCSLIFPHYADDR: 704 switch (cmd) { 705#ifdef INET 706 case SIOCSIFPHYADDR: 707 src = (struct sockaddr *) 708 &(((struct in_aliasreq *)data)->ifra_addr); 709 dst = (struct sockaddr *) 710 &(((struct in_aliasreq *)data)->ifra_dstaddr); 711 break; 712#endif 713#ifdef INET6 714 case SIOCSIFPHYADDR_IN6: 715 src = (struct sockaddr *) 716 &(((struct in6_aliasreq *)data)->ifra_addr); 717 dst = (struct sockaddr *) 718 &(((struct in6_aliasreq *)data)->ifra_dstaddr); 719 break; 720#endif 721 case SIOCSLIFPHYADDR: 722 src = (struct sockaddr *) 723 &(((struct if_laddrreq *)data)->addr); 724 dst = (struct sockaddr *) 725 &(((struct if_laddrreq *)data)->dstaddr); 726 break; 727 default: 728 return EINVAL; 729 } 730 731 /* sa_family must be equal */ 732 if (src->sa_family != dst->sa_family) 733 return EINVAL; 734 735 /* validate sa_len */ 736 switch (src->sa_family) { 737#ifdef INET 738 case AF_INET: 739 if (src->sa_len != sizeof(struct sockaddr_in)) 740 return EINVAL; 741 break; 742#endif 743#ifdef INET6 744 case AF_INET6: 745 if (src->sa_len != sizeof(struct sockaddr_in6)) 746 return EINVAL; 747 break; 748#endif 749 default: 750 return EAFNOSUPPORT; 751 } 752 switch (dst->sa_family) { 753#ifdef INET 754 case AF_INET: 755 if (dst->sa_len != sizeof(struct sockaddr_in)) 756 return EINVAL; 757 break; 758#endif 759#ifdef INET6 760 case AF_INET6: 761 if (dst->sa_len != sizeof(struct sockaddr_in6)) 762 return EINVAL; 763 break; 764#endif 765 default: 766 return EAFNOSUPPORT; 767 } 768 769 /* check sa_family looks sane for the cmd */ 770 switch (cmd) { 771 case SIOCSIFPHYADDR: 772 if (src->sa_family == AF_INET) 773 break; 774 return EAFNOSUPPORT; 775#ifdef INET6 776 case SIOCSIFPHYADDR_IN6: 777 if (src->sa_family == AF_INET6) 778 break; 779 return EAFNOSUPPORT; 780#endif /* INET6 */ 781 case SIOCSLIFPHYADDR: 782 /* checks done in the above */ 783 break; 784 } 785 786 error = gif_set_tunnel(GIF2IFP(sc), src, dst); 787 break; 788 789#ifdef SIOCDIFPHYADDR 790 case SIOCDIFPHYADDR: 791 gif_delete_tunnel(GIF2IFP(sc)); 792 break; 793#endif 794 795 case SIOCGIFPSRCADDR: 796#ifdef INET6 797 case SIOCGIFPSRCADDR_IN6: 798#endif /* INET6 */ 799 if (sc->gif_psrc == NULL) { 800 error = EADDRNOTAVAIL; 801 goto bad; 802 } 803 src = sc->gif_psrc; 804 switch (cmd) { 805#ifdef INET 806 case SIOCGIFPSRCADDR: 807 dst = &ifr->ifr_addr; 808 size = sizeof(ifr->ifr_addr); 809 break; 810#endif /* INET */ 811#ifdef INET6 812 case SIOCGIFPSRCADDR_IN6: 813 dst = (struct sockaddr *) 814 &(((struct in6_ifreq *)data)->ifr_addr); 815 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 816 break; 817#endif /* INET6 */ 818 default: 819 error = EADDRNOTAVAIL; 820 goto bad; 821 } 822 if (src->sa_len > size) 823 return EINVAL; 824 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 825#ifdef INET6 826 if (dst->sa_family == AF_INET6) { 827 error = sa6_recoverscope((struct sockaddr_in6 *)dst); 828 if (error != 0) 829 return (error); 830 } 831#endif 832 break; 833 834 case SIOCGIFPDSTADDR: 835#ifdef INET6 836 case SIOCGIFPDSTADDR_IN6: 837#endif /* INET6 */ 838 if (sc->gif_pdst == NULL) { 839 error = EADDRNOTAVAIL; 840 goto bad; 841 } 842 src = sc->gif_pdst; 843 switch (cmd) { 844#ifdef INET 845 case SIOCGIFPDSTADDR: 846 dst = &ifr->ifr_addr; 847 size = sizeof(ifr->ifr_addr); 848 break; 849#endif /* INET */ 850#ifdef INET6 851 case SIOCGIFPDSTADDR_IN6: 852 dst = (struct sockaddr *) 853 &(((struct in6_ifreq *)data)->ifr_addr); 854 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 855 break; 856#endif /* INET6 */ 857 default: 858 error = EADDRNOTAVAIL; 859 goto bad; 860 } 861 if (src->sa_len > size) 862 return EINVAL; 863 error = prison_if(curthread->td_ucred, src); 864 if (error != 0) 865 return (error); 866 error = prison_if(curthread->td_ucred, dst); 867 if (error != 0) 868 return (error); 869 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 870#ifdef INET6 871 if (dst->sa_family == AF_INET6) { 872 error = sa6_recoverscope((struct sockaddr_in6 *)dst); 873 if (error != 0) 874 return (error); 875 } 876#endif 877 break; 878 879 case SIOCGLIFPHYADDR: 880 if (sc->gif_psrc == NULL || sc->gif_pdst == NULL) { 881 error = EADDRNOTAVAIL; 882 goto bad; 883 } 884 885 /* copy src */ 886 src = sc->gif_psrc; 887 dst = (struct sockaddr *) 888 &(((struct if_laddrreq *)data)->addr); 889 size = sizeof(((struct if_laddrreq *)data)->addr); 890 if (src->sa_len > size) 891 return EINVAL; 892 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 893 894 /* copy dst */ 895 src = sc->gif_pdst; 896 dst = (struct sockaddr *) 897 &(((struct if_laddrreq *)data)->dstaddr); 898 size = sizeof(((struct if_laddrreq *)data)->dstaddr); 899 if (src->sa_len > size) 900 return EINVAL; 901 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 902 break; 903 904 case SIOCSIFFLAGS: 905 /* if_ioctl() takes care of it */ 906 break; 907 908 case GIFGOPTS: 909 options = sc->gif_options; 910 error = copyout(&options, ifr->ifr_data, 911 sizeof(options)); 912 break; 913 914 case GIFSOPTS: 915 if ((error = priv_check(curthread, PRIV_NET_GIF)) != 0) 916 break; 917 error = copyin(ifr->ifr_data, &options, sizeof(options)); 918 if (error) 919 break; 920 if (options & ~GIF_OPTMASK) 921 error = EINVAL; 922 else 923 sc->gif_options = options; 924 break; 925 926 default: 927 error = EINVAL; 928 break; 929 } 930 bad: 931 return error; 932} 933 934/* 935 * XXXRW: There's a general event-ordering issue here: the code to check 936 * if a given tunnel is already present happens before we perform a 937 * potentially blocking setup of the tunnel. This code needs to be 938 * re-ordered so that the check and replacement can be atomic using 939 * a mutex. 940 */ 941int 942gif_set_tunnel(ifp, src, dst) 943 struct ifnet *ifp; 944 struct sockaddr *src; 945 struct sockaddr *dst; 946{ 947 struct gif_softc *sc = ifp->if_softc; 948 struct gif_softc *sc2; 949 struct sockaddr *osrc, *odst, *sa; 950 int error = 0; 951 952 mtx_lock(&gif_mtx); 953 LIST_FOREACH(sc2, &V_gif_softc_list, gif_list) { 954 if (sc2 == sc) 955 continue; 956 if (!sc2->gif_pdst || !sc2->gif_psrc) 957 continue; 958 if (sc2->gif_pdst->sa_family != dst->sa_family || 959 sc2->gif_pdst->sa_len != dst->sa_len || 960 sc2->gif_psrc->sa_family != src->sa_family || 961 sc2->gif_psrc->sa_len != src->sa_len) 962 continue; 963 964 /* 965 * Disallow parallel tunnels unless instructed 966 * otherwise. 967 */ 968 if (!V_parallel_tunnels && 969 bcmp(sc2->gif_pdst, dst, dst->sa_len) == 0 && 970 bcmp(sc2->gif_psrc, src, src->sa_len) == 0) { 971 error = EADDRNOTAVAIL; 972 mtx_unlock(&gif_mtx); 973 goto bad; 974 } 975 976 /* XXX both end must be valid? (I mean, not 0.0.0.0) */ 977 } 978 mtx_unlock(&gif_mtx); 979 980 /* XXX we can detach from both, but be polite just in case */ 981 if (sc->gif_psrc) 982 switch (sc->gif_psrc->sa_family) { 983#ifdef INET 984 case AF_INET: 985 (void)in_gif_detach(sc); 986 break; 987#endif 988#ifdef INET6 989 case AF_INET6: 990 (void)in6_gif_detach(sc); 991 break; 992#endif 993 } 994 995 osrc = sc->gif_psrc; 996 sa = (struct sockaddr *)malloc(src->sa_len, M_IFADDR, M_WAITOK); 997 bcopy((caddr_t)src, (caddr_t)sa, src->sa_len); 998 sc->gif_psrc = sa; 999 1000 odst = sc->gif_pdst; 1001 sa = (struct sockaddr *)malloc(dst->sa_len, M_IFADDR, M_WAITOK); 1002 bcopy((caddr_t)dst, (caddr_t)sa, dst->sa_len); 1003 sc->gif_pdst = sa; 1004 1005 switch (sc->gif_psrc->sa_family) { 1006#ifdef INET 1007 case AF_INET: 1008 error = in_gif_attach(sc); 1009 break; 1010#endif 1011#ifdef INET6 1012 case AF_INET6: 1013 /* 1014 * Check validity of the scope zone ID of the addresses, and 1015 * convert it into the kernel internal form if necessary. 1016 */ 1017 error = sa6_embedscope((struct sockaddr_in6 *)sc->gif_psrc, 0); 1018 if (error != 0) 1019 break; 1020 error = sa6_embedscope((struct sockaddr_in6 *)sc->gif_pdst, 0); 1021 if (error != 0) 1022 break; 1023 error = in6_gif_attach(sc); 1024 break; 1025#endif 1026 } 1027 if (error) { 1028 /* rollback */ 1029 free((caddr_t)sc->gif_psrc, M_IFADDR); 1030 free((caddr_t)sc->gif_pdst, M_IFADDR); 1031 sc->gif_psrc = osrc; 1032 sc->gif_pdst = odst; 1033 goto bad; 1034 } 1035 1036 if (osrc) 1037 free((caddr_t)osrc, M_IFADDR); 1038 if (odst) 1039 free((caddr_t)odst, M_IFADDR); 1040 1041 bad: 1042 if (sc->gif_psrc && sc->gif_pdst) 1043 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1044 else 1045 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1046 1047 return error; 1048} 1049 1050void 1051gif_delete_tunnel(ifp) 1052 struct ifnet *ifp; 1053{ 1054 struct gif_softc *sc = ifp->if_softc; 1055 1056 if (sc->gif_psrc) { 1057 free((caddr_t)sc->gif_psrc, M_IFADDR); 1058 sc->gif_psrc = NULL; 1059 } 1060 if (sc->gif_pdst) { 1061 free((caddr_t)sc->gif_pdst, M_IFADDR); 1062 sc->gif_pdst = NULL; 1063 } 1064 /* it is safe to detach from both */ 1065#ifdef INET 1066 (void)in_gif_detach(sc); 1067#endif 1068#ifdef INET6 1069 (void)in6_gif_detach(sc); 1070#endif 1071 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1072} 1073