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sys/net/if_gif.c
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1 /* $FreeBSD: releng/7.3/sys/net/if_gif.c 196918 2009-09-07 10:15:50Z ume $ */ 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/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 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 static LIST_HEAD(, gif_softc) gif_softc_list; 98 99 void (*ng_gif_input_p)(struct ifnet *ifp, struct mbuf **mp, int af); 100 void (*ng_gif_input_orphan_p)(struct ifnet *ifp, struct mbuf *m, int af); 101 void (*ng_gif_attach_p)(struct ifnet *ifp); 102 void (*ng_gif_detach_p)(struct ifnet *ifp); 103 104 static void gif_start(struct ifnet *); 105 static int gif_clone_create(struct if_clone *, int, caddr_t); 106 static void gif_clone_destroy(struct ifnet *); 107 108 IFC_SIMPLE_DECLARE(gif, 0); 109 110 static int gifmodevent(module_t, int, void *); 111 112 SYSCTL_DECL(_net_link); 113 SYSCTL_NODE(_net_link, IFT_GIF, gif, CTLFLAG_RW, 0, 114 "Generic Tunnel Interface"); 115 #ifndef MAX_GIF_NEST 116 /* 117 * This macro controls the default upper limitation on nesting of gif tunnels. 118 * Since, setting a large value to this macro with a careless configuration 119 * may introduce system crash, we don't allow any nestings by default. 120 * If you need to configure nested gif tunnels, you can define this macro 121 * in your kernel configuration file. However, if you do so, please be 122 * careful to configure the tunnels so that it won't make a loop. 123 */ 124 #define MAX_GIF_NEST 1 125 #endif 126 static int max_gif_nesting = MAX_GIF_NEST; 127 SYSCTL_INT(_net_link_gif, OID_AUTO, max_nesting, CTLFLAG_RW, 128 &max_gif_nesting, 0, "Max nested tunnels"); 129 130 /* 131 * By default, we disallow creation of multiple tunnels between the same 132 * pair of addresses. Some applications require this functionality so 133 * we allow control over this check here. 134 */ 135 #ifdef XBONEHACK 136 static int parallel_tunnels = 1; 137 #else 138 static int parallel_tunnels = 0; 139 #endif 140 SYSCTL_INT(_net_link_gif, OID_AUTO, parallel_tunnels, CTLFLAG_RW, 141 ¶llel_tunnels, 0, "Allow parallel tunnels?"); 142 143 /* copy from src/sys/net/if_ethersubr.c */ 144 static const u_char etherbroadcastaddr[ETHER_ADDR_LEN] = 145 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 146 #ifndef ETHER_IS_BROADCAST 147 #define ETHER_IS_BROADCAST(addr) \ 148 (bcmp(etherbroadcastaddr, (addr), ETHER_ADDR_LEN) == 0) 149 #endif 150 151 static int 152 gif_clone_create(ifc, unit, params) 153 struct if_clone *ifc; 154 int unit; 155 caddr_t params; 156 { 157 struct gif_softc *sc; 158 159 sc = malloc(sizeof(struct gif_softc), M_GIF, M_WAITOK | M_ZERO); 160 sc->gif_fibnum = curthread->td_proc->p_fibnum; 161 GIF2IFP(sc) = if_alloc(IFT_GIF); 162 if (GIF2IFP(sc) == NULL) { 163 free(sc, M_GIF); 164 return (ENOSPC); 165 } 166 167 GIF_LOCK_INIT(sc); 168 169 GIF2IFP(sc)->if_softc = sc; 170 if_initname(GIF2IFP(sc), ifc->ifc_name, unit); 171 172 sc->encap_cookie4 = sc->encap_cookie6 = NULL; 173 sc->gif_options = GIF_ACCEPT_REVETHIP; 174 175 GIF2IFP(sc)->if_addrlen = 0; 176 GIF2IFP(sc)->if_mtu = GIF_MTU; 177 GIF2IFP(sc)->if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 178 #if 0 179 /* turn off ingress filter */ 180 GIF2IFP(sc)->if_flags |= IFF_LINK2; 181 #endif 182 GIF2IFP(sc)->if_ioctl = gif_ioctl; 183 GIF2IFP(sc)->if_start = gif_start; 184 GIF2IFP(sc)->if_output = gif_output; 185 GIF2IFP(sc)->if_snd.ifq_maxlen = IFQ_MAXLEN; 186 if_attach(GIF2IFP(sc)); 187 bpfattach(GIF2IFP(sc), DLT_NULL, sizeof(u_int32_t)); 188 if (ng_gif_attach_p != NULL) 189 (*ng_gif_attach_p)(GIF2IFP(sc)); 190 191 mtx_lock(&gif_mtx); 192 LIST_INSERT_HEAD(&gif_softc_list, sc, gif_list); 193 mtx_unlock(&gif_mtx); 194 195 return (0); 196 } 197 198 static void 199 gif_clone_destroy(ifp) 200 struct ifnet *ifp; 201 { 202 int err; 203 struct gif_softc *sc = ifp->if_softc; 204 205 mtx_lock(&gif_mtx); 206 LIST_REMOVE(sc, gif_list); 207 mtx_unlock(&gif_mtx); 208 209 gif_delete_tunnel(ifp); 210 #ifdef INET6 211 if (sc->encap_cookie6 != NULL) { 212 err = encap_detach(sc->encap_cookie6); 213 KASSERT(err == 0, ("Unexpected error detaching encap_cookie6")); 214 } 215 #endif 216 #ifdef INET 217 if (sc->encap_cookie4 != NULL) { 218 err = encap_detach(sc->encap_cookie4); 219 KASSERT(err == 0, ("Unexpected error detaching encap_cookie4")); 220 } 221 #endif 222 223 if (ng_gif_detach_p != NULL) 224 (*ng_gif_detach_p)(ifp); 225 bpfdetach(ifp); 226 if_detach(ifp); 227 if_free(ifp); 228 229 GIF_LOCK_DESTROY(sc); 230 231 free(sc, M_GIF); 232 } 233 234 static int 235 gifmodevent(mod, type, data) 236 module_t mod; 237 int type; 238 void *data; 239 { 240 241 switch (type) { 242 case MOD_LOAD: 243 mtx_init(&gif_mtx, "gif_mtx", NULL, MTX_DEF); 244 LIST_INIT(&gif_softc_list); 245 if_clone_attach(&gif_cloner); 246 247 #ifdef INET6 248 ip6_gif_hlim = GIF_HLIM; 249 #endif 250 251 break; 252 case MOD_UNLOAD: 253 if_clone_detach(&gif_cloner); 254 mtx_destroy(&gif_mtx); 255 #ifdef INET6 256 ip6_gif_hlim = 0; 257 #endif 258 break; 259 default: 260 return EOPNOTSUPP; 261 } 262 return 0; 263 } 264 265 static moduledata_t gif_mod = { 266 "if_gif", 267 gifmodevent, 268 0 269 }; 270 271 DECLARE_MODULE(if_gif, gif_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 272 MODULE_VERSION(if_gif, 1); 273 274 int 275 gif_encapcheck(m, off, proto, arg) 276 const struct mbuf *m; 277 int off; 278 int proto; 279 void *arg; 280 { 281 struct ip ip; 282 struct gif_softc *sc; 283 284 sc = (struct gif_softc *)arg; 285 if (sc == NULL) 286 return 0; 287 288 if ((GIF2IFP(sc)->if_flags & IFF_UP) == 0) 289 return 0; 290 291 /* no physical address */ 292 if (!sc->gif_psrc || !sc->gif_pdst) 293 return 0; 294 295 switch (proto) { 296 #ifdef INET 297 case IPPROTO_IPV4: 298 break; 299 #endif 300 #ifdef INET6 301 case IPPROTO_IPV6: 302 break; 303 #endif 304 case IPPROTO_ETHERIP: 305 break; 306 307 default: 308 return 0; 309 } 310 311 /* Bail on short packets */ 312 if (m->m_pkthdr.len < sizeof(ip)) 313 return 0; 314 315 m_copydata(m, 0, sizeof(ip), (caddr_t)&ip); 316 317 switch (ip.ip_v) { 318 #ifdef INET 319 case 4: 320 if (sc->gif_psrc->sa_family != AF_INET || 321 sc->gif_pdst->sa_family != AF_INET) 322 return 0; 323 return gif_encapcheck4(m, off, proto, arg); 324 #endif 325 #ifdef INET6 326 case 6: 327 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) 328 return 0; 329 if (sc->gif_psrc->sa_family != AF_INET6 || 330 sc->gif_pdst->sa_family != AF_INET6) 331 return 0; 332 return gif_encapcheck6(m, off, proto, arg); 333 #endif 334 default: 335 return 0; 336 } 337 } 338 339 static void 340 gif_start(struct ifnet *ifp) 341 { 342 struct gif_softc *sc; 343 struct mbuf *m; 344 345 sc = ifp->if_softc; 346 347 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 348 for (;;) { 349 IFQ_DEQUEUE(&ifp->if_snd, m); 350 if (m == 0) 351 break; 352 353 gif_output(ifp, m, sc->gif_pdst, NULL); 354 355 } 356 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 357 358 return; 359 } 360 361 int 362 gif_output(ifp, m, dst, rt) 363 struct ifnet *ifp; 364 struct mbuf *m; 365 struct sockaddr *dst; 366 struct rtentry *rt; /* added in net2 */ 367 { 368 struct gif_softc *sc = ifp->if_softc; 369 struct m_tag *mtag; 370 int error = 0; 371 int gif_called; 372 u_int32_t af; 373 374 #ifdef MAC 375 error = mac_check_ifnet_transmit(ifp, m); 376 if (error) { 377 m_freem(m); 378 goto end; 379 } 380 #endif 381 382 /* 383 * gif may cause infinite recursion calls when misconfigured. 384 * We'll prevent this by detecting loops. 385 * 386 * High nesting level may cause stack exhaustion. 387 * We'll prevent this by introducing upper limit. 388 */ 389 gif_called = 1; 390 mtag = m_tag_locate(m, MTAG_GIF, MTAG_GIF_CALLED, NULL); 391 while (mtag != NULL) { 392 if (*(struct ifnet **)(mtag + 1) == ifp) { 393 log(LOG_NOTICE, 394 "gif_output: loop detected on %s\n", 395 (*(struct ifnet **)(mtag + 1))->if_xname); 396 m_freem(m); 397 error = EIO; /* is there better errno? */ 398 goto end; 399 } 400 mtag = m_tag_locate(m, MTAG_GIF, MTAG_GIF_CALLED, mtag); 401 gif_called++; 402 } 403 if (gif_called > max_gif_nesting) { 404 log(LOG_NOTICE, 405 "gif_output: recursively called too many times(%d)\n", 406 gif_called); 407 m_freem(m); 408 error = EIO; /* is there better errno? */ 409 goto end; 410 } 411 mtag = m_tag_alloc(MTAG_GIF, MTAG_GIF_CALLED, sizeof(struct ifnet *), 412 M_NOWAIT); 413 if (mtag == NULL) { 414 m_freem(m); 415 error = ENOMEM; 416 goto end; 417 } 418 *(struct ifnet **)(mtag + 1) = ifp; 419 m_tag_prepend(m, mtag); 420 421 m->m_flags &= ~(M_BCAST|M_MCAST); 422 423 GIF_LOCK(sc); 424 425 if (!(ifp->if_flags & IFF_UP) || 426 sc->gif_psrc == NULL || sc->gif_pdst == NULL) { 427 GIF_UNLOCK(sc); 428 m_freem(m); 429 error = ENETDOWN; 430 goto end; 431 } 432 433 /* BPF writes need to be handled specially. */ 434 if (dst->sa_family == AF_UNSPEC) { 435 bcopy(dst->sa_data, &af, sizeof(af)); 436 dst->sa_family = af; 437 } 438 439 af = dst->sa_family; 440 BPF_MTAP2(ifp, &af, sizeof(af), m); 441 ifp->if_opackets++; 442 ifp->if_obytes += m->m_pkthdr.len; 443 444 /* override to IPPROTO_ETHERIP for bridged traffic */ 445 if (ifp->if_bridge) 446 af = AF_LINK; 447 448 M_SETFIB(m, sc->gif_fibnum); 449 /* inner AF-specific encapsulation */ 450 451 /* XXX should we check if our outer source is legal? */ 452 453 /* dispatch to output logic based on outer AF */ 454 switch (sc->gif_psrc->sa_family) { 455 #ifdef INET 456 case AF_INET: 457 error = in_gif_output(ifp, af, m); 458 break; 459 #endif 460 #ifdef INET6 461 case AF_INET6: 462 error = in6_gif_output(ifp, af, m); 463 break; 464 #endif 465 default: 466 m_freem(m); 467 error = ENETDOWN; 468 } 469 470 GIF_UNLOCK(sc); 471 end: 472 if (error) 473 ifp->if_oerrors++; 474 return (error); 475 } 476 477 void 478 gif_input(m, af, ifp) 479 struct mbuf *m; 480 int af; 481 struct ifnet *ifp; 482 { 483 int isr, n; 484 struct gif_softc *sc = ifp->if_softc; 485 struct etherip_header *eip; 486 struct ether_header *eh; 487 struct ifnet *oldifp; 488 489 if (ifp == NULL) { 490 /* just in case */ 491 m_freem(m); 492 return; 493 } 494 495 m->m_pkthdr.rcvif = ifp; 496 497 #ifdef MAC 498 mac_create_mbuf_from_ifnet(ifp, m); 499 #endif 500 501 if (bpf_peers_present(ifp->if_bpf)) { 502 u_int32_t af1 = af; 503 bpf_mtap2(ifp->if_bpf, &af1, sizeof(af1), m); 504 } 505 506 if (ng_gif_input_p != NULL) { 507 (*ng_gif_input_p)(ifp, &m, af); 508 if (m == NULL) 509 return; 510 } 511 512 /* 513 * Put the packet to the network layer input queue according to the 514 * specified address family. 515 * Note: older versions of gif_input directly called network layer 516 * input functions, e.g. ip6_input, here. We changed the policy to 517 * prevent too many recursive calls of such input functions, which 518 * might cause kernel panic. But the change may introduce another 519 * problem; if the input queue is full, packets are discarded. 520 * The kernel stack overflow really happened, and we believed 521 * queue-full rarely occurs, so we changed the policy. 522 */ 523 switch (af) { 524 #ifdef INET 525 case AF_INET: 526 isr = NETISR_IP; 527 break; 528 #endif 529 #ifdef INET6 530 case AF_INET6: 531 isr = NETISR_IPV6; 532 break; 533 #endif 534 case AF_LINK: 535 n = sizeof(struct etherip_header) + sizeof(struct ether_header); 536 if (n > m->m_len) { 537 m = m_pullup(m, n); 538 if (m == NULL) { 539 ifp->if_ierrors++; 540 return; 541 } 542 } 543 544 eip = mtod(m, struct etherip_header *); 545 /* 546 * GIF_ACCEPT_REVETHIP (enabled by default) intentionally 547 * accepts an EtherIP packet with revered version field in 548 * the header. This is a knob for backward compatibility 549 * with FreeBSD 7.2R or prior. 550 */ 551 if (sc->gif_options & GIF_ACCEPT_REVETHIP) { 552 if (eip->eip_resvl != ETHERIP_VERSION 553 && eip->eip_ver != ETHERIP_VERSION) { 554 /* discard unknown versions */ 555 m_freem(m); 556 return; 557 } 558 } else { 559 if (eip->eip_ver != ETHERIP_VERSION) { 560 /* discard unknown versions */ 561 m_freem(m); 562 return; 563 } 564 } 565 m_adj(m, sizeof(struct etherip_header)); 566 567 m->m_flags &= ~(M_BCAST|M_MCAST); 568 m->m_pkthdr.rcvif = ifp; 569 570 if (ifp->if_bridge) { 571 oldifp = ifp; 572 eh = mtod(m, struct ether_header *); 573 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 574 if (ETHER_IS_BROADCAST(eh->ether_dhost)) 575 m->m_flags |= M_BCAST; 576 else 577 m->m_flags |= M_MCAST; 578 ifp->if_imcasts++; 579 } 580 BRIDGE_INPUT(ifp, m); 581 582 if (m != NULL && ifp != oldifp) { 583 /* 584 * The bridge gave us back itself or one of the 585 * members for which the frame is addressed. 586 */ 587 ether_demux(ifp, m); 588 return; 589 } 590 } 591 if (m != NULL) 592 m_freem(m); 593 return; 594 595 default: 596 if (ng_gif_input_orphan_p != NULL) 597 (*ng_gif_input_orphan_p)(ifp, m, af); 598 else 599 m_freem(m); 600 return; 601 } 602 603 ifp->if_ipackets++; 604 ifp->if_ibytes += m->m_pkthdr.len; 605 netisr_dispatch(isr, m); 606 } 607 608 /* XXX how should we handle IPv6 scope on SIOC[GS]IFPHYADDR? */ 609 int 610 gif_ioctl(ifp, cmd, data) 611 struct ifnet *ifp; 612 u_long cmd; 613 caddr_t data; 614 { 615 struct gif_softc *sc = ifp->if_softc; 616 struct ifreq *ifr = (struct ifreq*)data; 617 int error = 0, size; 618 u_int options; 619 struct sockaddr *dst, *src; 620 #ifdef SIOCSIFMTU /* xxx */ 621 u_long mtu; 622 #endif 623 624 switch (cmd) { 625 case SIOCSIFADDR: 626 ifp->if_flags |= IFF_UP; 627 break; 628 629 case SIOCSIFDSTADDR: 630 break; 631 632 case SIOCADDMULTI: 633 case SIOCDELMULTI: 634 break; 635 636 #ifdef SIOCSIFMTU /* xxx */ 637 case SIOCGIFMTU: 638 break; 639 640 case SIOCSIFMTU: 641 mtu = ifr->ifr_mtu; 642 if (mtu < GIF_MTU_MIN || mtu > GIF_MTU_MAX) 643 return (EINVAL); 644 ifp->if_mtu = mtu; 645 break; 646 #endif /* SIOCSIFMTU */ 647 648 #ifdef INET 649 case SIOCSIFPHYADDR: 650 #endif 651 #ifdef INET6 652 case SIOCSIFPHYADDR_IN6: 653 #endif /* INET6 */ 654 case SIOCSLIFPHYADDR: 655 switch (cmd) { 656 #ifdef INET 657 case SIOCSIFPHYADDR: 658 src = (struct sockaddr *) 659 &(((struct in_aliasreq *)data)->ifra_addr); 660 dst = (struct sockaddr *) 661 &(((struct in_aliasreq *)data)->ifra_dstaddr); 662 break; 663 #endif 664 #ifdef INET6 665 case SIOCSIFPHYADDR_IN6: 666 src = (struct sockaddr *) 667 &(((struct in6_aliasreq *)data)->ifra_addr); 668 dst = (struct sockaddr *) 669 &(((struct in6_aliasreq *)data)->ifra_dstaddr); 670 break; 671 #endif 672 case SIOCSLIFPHYADDR: 673 src = (struct sockaddr *) 674 &(((struct if_laddrreq *)data)->addr); 675 dst = (struct sockaddr *) 676 &(((struct if_laddrreq *)data)->dstaddr); 677 break; 678 default: 679 return EINVAL; 680 } 681 682 /* sa_family must be equal */ 683 if (src->sa_family != dst->sa_family) 684 return EINVAL; 685 686 /* validate sa_len */ 687 switch (src->sa_family) { 688 #ifdef INET 689 case AF_INET: 690 if (src->sa_len != sizeof(struct sockaddr_in)) 691 return EINVAL; 692 break; 693 #endif 694 #ifdef INET6 695 case AF_INET6: 696 if (src->sa_len != sizeof(struct sockaddr_in6)) 697 return EINVAL; 698 break; 699 #endif 700 default: 701 return EAFNOSUPPORT; 702 } 703 switch (dst->sa_family) { 704 #ifdef INET 705 case AF_INET: 706 if (dst->sa_len != sizeof(struct sockaddr_in)) 707 return EINVAL; 708 break; 709 #endif 710 #ifdef INET6 711 case AF_INET6: 712 if (dst->sa_len != sizeof(struct sockaddr_in6)) 713 return EINVAL; 714 break; 715 #endif 716 default: 717 return EAFNOSUPPORT; 718 } 719 720 /* check sa_family looks sane for the cmd */ 721 switch (cmd) { 722 case SIOCSIFPHYADDR: 723 if (src->sa_family == AF_INET) 724 break; 725 return EAFNOSUPPORT; 726 #ifdef INET6 727 case SIOCSIFPHYADDR_IN6: 728 if (src->sa_family == AF_INET6) 729 break; 730 return EAFNOSUPPORT; 731 #endif /* INET6 */ 732 case SIOCSLIFPHYADDR: 733 /* checks done in the above */ 734 break; 735 } 736 737 error = gif_set_tunnel(GIF2IFP(sc), src, dst); 738 break; 739 740 #ifdef SIOCDIFPHYADDR 741 case SIOCDIFPHYADDR: 742 gif_delete_tunnel(GIF2IFP(sc)); 743 break; 744 #endif 745 746 case SIOCGIFPSRCADDR: 747 #ifdef INET6 748 case SIOCGIFPSRCADDR_IN6: 749 #endif /* INET6 */ 750 if (sc->gif_psrc == NULL) { 751 error = EADDRNOTAVAIL; 752 goto bad; 753 } 754 src = sc->gif_psrc; 755 switch (cmd) { 756 #ifdef INET 757 case SIOCGIFPSRCADDR: 758 dst = &ifr->ifr_addr; 759 size = sizeof(ifr->ifr_addr); 760 break; 761 #endif /* INET */ 762 #ifdef INET6 763 case SIOCGIFPSRCADDR_IN6: 764 dst = (struct sockaddr *) 765 &(((struct in6_ifreq *)data)->ifr_addr); 766 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 767 break; 768 #endif /* INET6 */ 769 default: 770 error = EADDRNOTAVAIL; 771 goto bad; 772 } 773 if (src->sa_len > size) 774 return EINVAL; 775 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 776 #ifdef INET6 777 if (dst->sa_family == AF_INET6) { 778 error = sa6_recoverscope((struct sockaddr_in6 *)dst); 779 if (error != 0) 780 return (error); 781 } 782 #endif 783 break; 784 785 case SIOCGIFPDSTADDR: 786 #ifdef INET6 787 case SIOCGIFPDSTADDR_IN6: 788 #endif /* INET6 */ 789 if (sc->gif_pdst == NULL) { 790 error = EADDRNOTAVAIL; 791 goto bad; 792 } 793 src = sc->gif_pdst; 794 switch (cmd) { 795 #ifdef INET 796 case SIOCGIFPDSTADDR: 797 dst = &ifr->ifr_addr; 798 size = sizeof(ifr->ifr_addr); 799 break; 800 #endif /* INET */ 801 #ifdef INET6 802 case SIOCGIFPDSTADDR_IN6: 803 dst = (struct sockaddr *) 804 &(((struct in6_ifreq *)data)->ifr_addr); 805 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 806 break; 807 #endif /* INET6 */ 808 default: 809 error = EADDRNOTAVAIL; 810 goto bad; 811 } 812 if (src->sa_len > size) 813 return EINVAL; 814 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 815 #ifdef INET6 816 if (dst->sa_family == AF_INET6) { 817 error = sa6_recoverscope((struct sockaddr_in6 *)dst); 818 if (error != 0) 819 return (error); 820 } 821 #endif 822 break; 823 824 case SIOCGLIFPHYADDR: 825 if (sc->gif_psrc == NULL || sc->gif_pdst == NULL) { 826 error = EADDRNOTAVAIL; 827 goto bad; 828 } 829 830 /* copy src */ 831 src = sc->gif_psrc; 832 dst = (struct sockaddr *) 833 &(((struct if_laddrreq *)data)->addr); 834 size = sizeof(((struct if_laddrreq *)data)->addr); 835 if (src->sa_len > size) 836 return EINVAL; 837 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 838 839 /* copy dst */ 840 src = sc->gif_pdst; 841 dst = (struct sockaddr *) 842 &(((struct if_laddrreq *)data)->dstaddr); 843 size = sizeof(((struct if_laddrreq *)data)->dstaddr); 844 if (src->sa_len > size) 845 return EINVAL; 846 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 847 break; 848 849 case SIOCSIFFLAGS: 850 /* if_ioctl() takes care of it */ 851 break; 852 853 case GIFGOPTS: 854 options = sc->gif_options; 855 error = copyout(&options, ifr->ifr_data, 856 sizeof(options)); 857 break; 858 859 case GIFSOPTS: 860 if ((error = priv_check(curthread, PRIV_NET_GIF)) != 0) 861 break; 862 error = copyin(ifr->ifr_data, &options, sizeof(options)); 863 if (error) 864 break; 865 if (options & ~GIF_OPTMASK) 866 error = EINVAL; 867 else 868 sc->gif_options = options; 869 break; 870 871 default: 872 error = EINVAL; 873 break; 874 } 875 bad: 876 return error; 877 } 878 879 /* 880 * XXXRW: There's a general event-ordering issue here: the code to check 881 * if a given tunnel is already present happens before we perform a 882 * potentially blocking setup of the tunnel. This code needs to be 883 * re-ordered so that the check and replacement can be atomic using 884 * a mutex. 885 */ 886 int 887 gif_set_tunnel(ifp, src, dst) 888 struct ifnet *ifp; 889 struct sockaddr *src; 890 struct sockaddr *dst; 891 { 892 struct gif_softc *sc = ifp->if_softc; 893 struct gif_softc *sc2; 894 struct sockaddr *osrc, *odst, *sa; 895 int error = 0; 896 897 mtx_lock(&gif_mtx); 898 LIST_FOREACH(sc2, &gif_softc_list, gif_list) { 899 if (sc2 == sc) 900 continue; 901 if (!sc2->gif_pdst || !sc2->gif_psrc) 902 continue; 903 if (sc2->gif_pdst->sa_family != dst->sa_family || 904 sc2->gif_pdst->sa_len != dst->sa_len || 905 sc2->gif_psrc->sa_family != src->sa_family || 906 sc2->gif_psrc->sa_len != src->sa_len) 907 continue; 908 909 /* 910 * Disallow parallel tunnels unless instructed 911 * otherwise. 912 */ 913 if (!parallel_tunnels && 914 bcmp(sc2->gif_pdst, dst, dst->sa_len) == 0 && 915 bcmp(sc2->gif_psrc, src, src->sa_len) == 0) { 916 error = EADDRNOTAVAIL; 917 mtx_unlock(&gif_mtx); 918 goto bad; 919 } 920 921 /* XXX both end must be valid? (I mean, not 0.0.0.0) */ 922 } 923 mtx_unlock(&gif_mtx); 924 925 /* XXX we can detach from both, but be polite just in case */ 926 if (sc->gif_psrc) 927 switch (sc->gif_psrc->sa_family) { 928 #ifdef INET 929 case AF_INET: 930 (void)in_gif_detach(sc); 931 break; 932 #endif 933 #ifdef INET6 934 case AF_INET6: 935 (void)in6_gif_detach(sc); 936 break; 937 #endif 938 } 939 940 osrc = sc->gif_psrc; 941 sa = (struct sockaddr *)malloc(src->sa_len, M_IFADDR, M_WAITOK); 942 bcopy((caddr_t)src, (caddr_t)sa, src->sa_len); 943 sc->gif_psrc = sa; 944 945 odst = sc->gif_pdst; 946 sa = (struct sockaddr *)malloc(dst->sa_len, M_IFADDR, M_WAITOK); 947 bcopy((caddr_t)dst, (caddr_t)sa, dst->sa_len); 948 sc->gif_pdst = sa; 949 950 switch (sc->gif_psrc->sa_family) { 951 #ifdef INET 952 case AF_INET: 953 error = in_gif_attach(sc); 954 break; 955 #endif 956 #ifdef INET6 957 case AF_INET6: 958 /* 959 * Check validity of the scope zone ID of the addresses, and 960 * convert it into the kernel internal form if necessary. 961 */ 962 error = sa6_embedscope((struct sockaddr_in6 *)sc->gif_psrc, 0); 963 if (error != 0) 964 break; 965 error = sa6_embedscope((struct sockaddr_in6 *)sc->gif_pdst, 0); 966 if (error != 0) 967 break; 968 error = in6_gif_attach(sc); 969 break; 970 #endif 971 } 972 if (error) { 973 /* rollback */ 974 free((caddr_t)sc->gif_psrc, M_IFADDR); 975 free((caddr_t)sc->gif_pdst, M_IFADDR); 976 sc->gif_psrc = osrc; 977 sc->gif_pdst = odst; 978 goto bad; 979 } 980 981 if (osrc) 982 free((caddr_t)osrc, M_IFADDR); 983 if (odst) 984 free((caddr_t)odst, M_IFADDR); 985 986 bad: 987 if (sc->gif_psrc && sc->gif_pdst) 988 ifp->if_drv_flags |= IFF_DRV_RUNNING; 989 else 990 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 991 992 return error; 993 } 994 995 void 996 gif_delete_tunnel(ifp) 997 struct ifnet *ifp; 998 { 999 struct gif_softc *sc = ifp->if_softc; 1000 1001 if (sc->gif_psrc) { 1002 free((caddr_t)sc->gif_psrc, M_IFADDR); 1003 sc->gif_psrc = NULL; 1004 } 1005 if (sc->gif_pdst) { 1006 free((caddr_t)sc->gif_pdst, M_IFADDR); 1007 sc->gif_pdst = NULL; 1008 } 1009 /* it is safe to detach from both */ 1010 #ifdef INET 1011 (void)in_gif_detach(sc); 1012 #endif 1013 #ifdef INET6 1014 (void)in6_gif_detach(sc); 1015 #endif 1016 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1017 }
Cache object: 46d0f9840a8ad376891aa2d0156aeb78
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