if_gif.c revision 241610
1/* $FreeBSD: head/sys/net/if_gif.c 241610 2012-10-16 13:37:54Z 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(ifp, m, dst, ro) 426 struct ifnet *ifp; 427 struct mbuf *m; 428 struct sockaddr *dst; 429 struct route *ro; 430{ 431 struct gif_softc *sc = ifp->if_softc; 432 struct m_tag *mtag; 433 int error = 0; 434 int gif_called; 435 uint32_t af; 436#ifdef MAC 437 error = mac_ifnet_check_transmit(ifp, m); 438 if (error) { 439 m_freem(m); 440 goto end; 441 } 442#endif 443 444 /* 445 * gif may cause infinite recursion calls when misconfigured. 446 * We'll prevent this by detecting loops. 447 * 448 * High nesting level may cause stack exhaustion. 449 * We'll prevent this by introducing upper limit. 450 */ 451 gif_called = 1; 452 mtag = m_tag_locate(m, MTAG_GIF, MTAG_GIF_CALLED, NULL); 453 while (mtag != NULL) { 454 if (*(struct ifnet **)(mtag + 1) == ifp) { 455 log(LOG_NOTICE, 456 "gif_output: loop detected on %s\n", 457 (*(struct ifnet **)(mtag + 1))->if_xname); 458 m_freem(m); 459 error = EIO; /* is there better errno? */ 460 goto end; 461 } 462 mtag = m_tag_locate(m, MTAG_GIF, MTAG_GIF_CALLED, mtag); 463 gif_called++; 464 } 465 if (gif_called > V_max_gif_nesting) { 466 log(LOG_NOTICE, 467 "gif_output: recursively called too many times(%d)\n", 468 gif_called); 469 m_freem(m); 470 error = EIO; /* is there better errno? */ 471 goto end; 472 } 473 mtag = m_tag_alloc(MTAG_GIF, MTAG_GIF_CALLED, sizeof(struct ifnet *), 474 M_NOWAIT); 475 if (mtag == NULL) { 476 m_freem(m); 477 error = ENOMEM; 478 goto end; 479 } 480 *(struct ifnet **)(mtag + 1) = ifp; 481 m_tag_prepend(m, mtag); 482 483 m->m_flags &= ~(M_BCAST|M_MCAST); 484 /* BPF writes need to be handled specially. */ 485 if (dst->sa_family == AF_UNSPEC) { 486 bcopy(dst->sa_data, &af, sizeof(af)); 487 dst->sa_family = af; 488 } 489 af = dst->sa_family; 490 /* 491 * Now save the af in the inbound pkt csum 492 * data, this is a cheat since we are using 493 * the inbound csum_data field to carry the 494 * af over to the gif_start() routine, avoiding 495 * using yet another mtag. 496 */ 497 m->m_pkthdr.csum_data = af; 498 if (!(ifp->if_flags & IFF_UP) || 499 sc->gif_psrc == NULL || sc->gif_pdst == NULL) { 500 m_freem(m); 501 error = ENETDOWN; 502 goto end; 503 } 504#ifdef ALTQ 505 /* 506 * Make altq aware of the bytes we will add 507 * when we actually send it. 508 */ 509#ifdef INET 510 if (sc->gif_psrc->sa_family == AF_INET) 511 m->m_pkthdr.len += GIF_HDR_LEN; 512#endif 513#ifdef INET6 514 if (sc->gif_psrc->sa_family == AF_INET6) 515 m->m_pkthdr.len += GIF_HDR_LEN6; 516#endif 517#endif 518 /* 519 * Queue message on interface, update output statistics if 520 * successful, and start output if interface not yet active. 521 */ 522 IFQ_HANDOFF(ifp, m, error); 523 end: 524 if (error) 525 ifp->if_oerrors++; 526 return (error); 527} 528 529void 530gif_input(m, af, ifp) 531 struct mbuf *m; 532 int af; 533 struct ifnet *ifp; 534{ 535 int isr, n; 536 struct gif_softc *sc; 537 struct etherip_header *eip; 538 struct ether_header *eh; 539 struct ifnet *oldifp; 540 541 if (ifp == NULL) { 542 /* just in case */ 543 m_freem(m); 544 return; 545 } 546 sc = ifp->if_softc; 547 m->m_pkthdr.rcvif = ifp; 548 549#ifdef MAC 550 mac_ifnet_create_mbuf(ifp, m); 551#endif 552 553 if (bpf_peers_present(ifp->if_bpf)) { 554 u_int32_t af1 = af; 555 bpf_mtap2(ifp->if_bpf, &af1, sizeof(af1), m); 556 } 557 558 if (ng_gif_input_p != NULL) { 559 (*ng_gif_input_p)(ifp, &m, af); 560 if (m == NULL) 561 return; 562 } 563 564 /* 565 * Put the packet to the network layer input queue according to the 566 * specified address family. 567 * Note: older versions of gif_input directly called network layer 568 * input functions, e.g. ip6_input, here. We changed the policy to 569 * prevent too many recursive calls of such input functions, which 570 * might cause kernel panic. But the change may introduce another 571 * problem; if the input queue is full, packets are discarded. 572 * The kernel stack overflow really happened, and we believed 573 * queue-full rarely occurs, so we changed the policy. 574 */ 575 switch (af) { 576#ifdef INET 577 case AF_INET: 578 isr = NETISR_IP; 579 break; 580#endif 581#ifdef INET6 582 case AF_INET6: 583 isr = NETISR_IPV6; 584 break; 585#endif 586 case AF_LINK: 587 n = sizeof(struct etherip_header) + sizeof(struct ether_header); 588 if (n > m->m_len) { 589 m = m_pullup(m, n); 590 if (m == NULL) { 591 ifp->if_ierrors++; 592 return; 593 } 594 } 595 596 eip = mtod(m, struct etherip_header *); 597 /* 598 * GIF_ACCEPT_REVETHIP (enabled by default) intentionally 599 * accepts an EtherIP packet with revered version field in 600 * the header. This is a knob for backward compatibility 601 * with FreeBSD 7.2R or prior. 602 */ 603 if (sc->gif_options & GIF_ACCEPT_REVETHIP) { 604 if (eip->eip_resvl != ETHERIP_VERSION 605 && eip->eip_ver != ETHERIP_VERSION) { 606 /* discard unknown versions */ 607 m_freem(m); 608 return; 609 } 610 } else { 611 if (eip->eip_ver != ETHERIP_VERSION) { 612 /* discard unknown versions */ 613 m_freem(m); 614 return; 615 } 616 } 617 m_adj(m, sizeof(struct etherip_header)); 618 619 m->m_flags &= ~(M_BCAST|M_MCAST); 620 m->m_pkthdr.rcvif = ifp; 621 622 if (ifp->if_bridge) { 623 oldifp = ifp; 624 eh = mtod(m, struct ether_header *); 625 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 626 if (ETHER_IS_BROADCAST(eh->ether_dhost)) 627 m->m_flags |= M_BCAST; 628 else 629 m->m_flags |= M_MCAST; 630 ifp->if_imcasts++; 631 } 632 BRIDGE_INPUT(ifp, m); 633 634 if (m != NULL && ifp != oldifp) { 635 /* 636 * The bridge gave us back itself or one of the 637 * members for which the frame is addressed. 638 */ 639 ether_demux(ifp, m); 640 return; 641 } 642 } 643 if (m != NULL) 644 m_freem(m); 645 return; 646 647 default: 648 if (ng_gif_input_orphan_p != NULL) 649 (*ng_gif_input_orphan_p)(ifp, m, af); 650 else 651 m_freem(m); 652 return; 653 } 654 655 ifp->if_ipackets++; 656 ifp->if_ibytes += m->m_pkthdr.len; 657 M_SETFIB(m, ifp->if_fib); 658 netisr_dispatch(isr, m); 659} 660 661/* XXX how should we handle IPv6 scope on SIOC[GS]IFPHYADDR? */ 662int 663gif_ioctl(ifp, cmd, data) 664 struct ifnet *ifp; 665 u_long cmd; 666 caddr_t data; 667{ 668 struct gif_softc *sc = ifp->if_softc; 669 struct ifreq *ifr = (struct ifreq*)data; 670 int error = 0, size; 671 u_int options; 672 struct sockaddr *dst, *src; 673#ifdef SIOCSIFMTU /* xxx */ 674 u_long mtu; 675#endif 676 677 switch (cmd) { 678 case SIOCSIFADDR: 679 ifp->if_flags |= IFF_UP; 680 break; 681 682 case SIOCSIFDSTADDR: 683 break; 684 685 case SIOCADDMULTI: 686 case SIOCDELMULTI: 687 break; 688 689#ifdef SIOCSIFMTU /* xxx */ 690 case SIOCGIFMTU: 691 break; 692 693 case SIOCSIFMTU: 694 mtu = ifr->ifr_mtu; 695 if (mtu < GIF_MTU_MIN || mtu > GIF_MTU_MAX) 696 return (EINVAL); 697 ifp->if_mtu = mtu; 698 break; 699#endif /* SIOCSIFMTU */ 700 701#ifdef INET 702 case SIOCSIFPHYADDR: 703#endif 704#ifdef INET6 705 case SIOCSIFPHYADDR_IN6: 706#endif /* INET6 */ 707 case SIOCSLIFPHYADDR: 708 switch (cmd) { 709#ifdef INET 710 case SIOCSIFPHYADDR: 711 src = (struct sockaddr *) 712 &(((struct in_aliasreq *)data)->ifra_addr); 713 dst = (struct sockaddr *) 714 &(((struct in_aliasreq *)data)->ifra_dstaddr); 715 break; 716#endif 717#ifdef INET6 718 case SIOCSIFPHYADDR_IN6: 719 src = (struct sockaddr *) 720 &(((struct in6_aliasreq *)data)->ifra_addr); 721 dst = (struct sockaddr *) 722 &(((struct in6_aliasreq *)data)->ifra_dstaddr); 723 break; 724#endif 725 case SIOCSLIFPHYADDR: 726 src = (struct sockaddr *) 727 &(((struct if_laddrreq *)data)->addr); 728 dst = (struct sockaddr *) 729 &(((struct if_laddrreq *)data)->dstaddr); 730 break; 731 default: 732 return EINVAL; 733 } 734 735 /* sa_family must be equal */ 736 if (src->sa_family != dst->sa_family) 737 return EINVAL; 738 739 /* validate sa_len */ 740 switch (src->sa_family) { 741#ifdef INET 742 case AF_INET: 743 if (src->sa_len != sizeof(struct sockaddr_in)) 744 return EINVAL; 745 break; 746#endif 747#ifdef INET6 748 case AF_INET6: 749 if (src->sa_len != sizeof(struct sockaddr_in6)) 750 return EINVAL; 751 break; 752#endif 753 default: 754 return EAFNOSUPPORT; 755 } 756 switch (dst->sa_family) { 757#ifdef INET 758 case AF_INET: 759 if (dst->sa_len != sizeof(struct sockaddr_in)) 760 return EINVAL; 761 break; 762#endif 763#ifdef INET6 764 case AF_INET6: 765 if (dst->sa_len != sizeof(struct sockaddr_in6)) 766 return EINVAL; 767 break; 768#endif 769 default: 770 return EAFNOSUPPORT; 771 } 772 773 /* check sa_family looks sane for the cmd */ 774 switch (cmd) { 775 case SIOCSIFPHYADDR: 776 if (src->sa_family == AF_INET) 777 break; 778 return EAFNOSUPPORT; 779#ifdef INET6 780 case SIOCSIFPHYADDR_IN6: 781 if (src->sa_family == AF_INET6) 782 break; 783 return EAFNOSUPPORT; 784#endif /* INET6 */ 785 case SIOCSLIFPHYADDR: 786 /* checks done in the above */ 787 break; 788 } 789 790 error = gif_set_tunnel(GIF2IFP(sc), src, dst); 791 break; 792 793#ifdef SIOCDIFPHYADDR 794 case SIOCDIFPHYADDR: 795 gif_delete_tunnel(GIF2IFP(sc)); 796 break; 797#endif 798 799 case SIOCGIFPSRCADDR: 800#ifdef INET6 801 case SIOCGIFPSRCADDR_IN6: 802#endif /* INET6 */ 803 if (sc->gif_psrc == NULL) { 804 error = EADDRNOTAVAIL; 805 goto bad; 806 } 807 src = sc->gif_psrc; 808 switch (cmd) { 809#ifdef INET 810 case SIOCGIFPSRCADDR: 811 dst = &ifr->ifr_addr; 812 size = sizeof(ifr->ifr_addr); 813 break; 814#endif /* INET */ 815#ifdef INET6 816 case SIOCGIFPSRCADDR_IN6: 817 dst = (struct sockaddr *) 818 &(((struct in6_ifreq *)data)->ifr_addr); 819 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 820 break; 821#endif /* INET6 */ 822 default: 823 error = EADDRNOTAVAIL; 824 goto bad; 825 } 826 if (src->sa_len > size) 827 return EINVAL; 828 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 829#ifdef INET6 830 if (dst->sa_family == AF_INET6) { 831 error = sa6_recoverscope((struct sockaddr_in6 *)dst); 832 if (error != 0) 833 return (error); 834 } 835#endif 836 break; 837 838 case SIOCGIFPDSTADDR: 839#ifdef INET6 840 case SIOCGIFPDSTADDR_IN6: 841#endif /* INET6 */ 842 if (sc->gif_pdst == NULL) { 843 error = EADDRNOTAVAIL; 844 goto bad; 845 } 846 src = sc->gif_pdst; 847 switch (cmd) { 848#ifdef INET 849 case SIOCGIFPDSTADDR: 850 dst = &ifr->ifr_addr; 851 size = sizeof(ifr->ifr_addr); 852 break; 853#endif /* INET */ 854#ifdef INET6 855 case SIOCGIFPDSTADDR_IN6: 856 dst = (struct sockaddr *) 857 &(((struct in6_ifreq *)data)->ifr_addr); 858 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 859 break; 860#endif /* INET6 */ 861 default: 862 error = EADDRNOTAVAIL; 863 goto bad; 864 } 865 if (src->sa_len > size) 866 return EINVAL; 867 error = prison_if(curthread->td_ucred, src); 868 if (error != 0) 869 return (error); 870 error = prison_if(curthread->td_ucred, dst); 871 if (error != 0) 872 return (error); 873 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 874#ifdef INET6 875 if (dst->sa_family == AF_INET6) { 876 error = sa6_recoverscope((struct sockaddr_in6 *)dst); 877 if (error != 0) 878 return (error); 879 } 880#endif 881 break; 882 883 case SIOCGLIFPHYADDR: 884 if (sc->gif_psrc == NULL || sc->gif_pdst == NULL) { 885 error = EADDRNOTAVAIL; 886 goto bad; 887 } 888 889 /* copy src */ 890 src = sc->gif_psrc; 891 dst = (struct sockaddr *) 892 &(((struct if_laddrreq *)data)->addr); 893 size = sizeof(((struct if_laddrreq *)data)->addr); 894 if (src->sa_len > size) 895 return EINVAL; 896 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 897 898 /* copy dst */ 899 src = sc->gif_pdst; 900 dst = (struct sockaddr *) 901 &(((struct if_laddrreq *)data)->dstaddr); 902 size = sizeof(((struct if_laddrreq *)data)->dstaddr); 903 if (src->sa_len > size) 904 return EINVAL; 905 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 906 break; 907 908 case SIOCSIFFLAGS: 909 /* if_ioctl() takes care of it */ 910 break; 911 912 case GIFGOPTS: 913 options = sc->gif_options; 914 error = copyout(&options, ifr->ifr_data, 915 sizeof(options)); 916 break; 917 918 case GIFSOPTS: 919 if ((error = priv_check(curthread, PRIV_NET_GIF)) != 0) 920 break; 921 error = copyin(ifr->ifr_data, &options, sizeof(options)); 922 if (error) 923 break; 924 if (options & ~GIF_OPTMASK) 925 error = EINVAL; 926 else 927 sc->gif_options = options; 928 break; 929 930 default: 931 error = EINVAL; 932 break; 933 } 934 bad: 935 return error; 936} 937 938/* 939 * XXXRW: There's a general event-ordering issue here: the code to check 940 * if a given tunnel is already present happens before we perform a 941 * potentially blocking setup of the tunnel. This code needs to be 942 * re-ordered so that the check and replacement can be atomic using 943 * a mutex. 944 */ 945int 946gif_set_tunnel(ifp, src, dst) 947 struct ifnet *ifp; 948 struct sockaddr *src; 949 struct sockaddr *dst; 950{ 951 struct gif_softc *sc = ifp->if_softc; 952 struct gif_softc *sc2; 953 struct sockaddr *osrc, *odst, *sa; 954 int error = 0; 955 956 mtx_lock(&gif_mtx); 957 LIST_FOREACH(sc2, &V_gif_softc_list, gif_list) { 958 if (sc2 == sc) 959 continue; 960 if (!sc2->gif_pdst || !sc2->gif_psrc) 961 continue; 962 if (sc2->gif_pdst->sa_family != dst->sa_family || 963 sc2->gif_pdst->sa_len != dst->sa_len || 964 sc2->gif_psrc->sa_family != src->sa_family || 965 sc2->gif_psrc->sa_len != src->sa_len) 966 continue; 967 968 /* 969 * Disallow parallel tunnels unless instructed 970 * otherwise. 971 */ 972 if (!V_parallel_tunnels && 973 bcmp(sc2->gif_pdst, dst, dst->sa_len) == 0 && 974 bcmp(sc2->gif_psrc, src, src->sa_len) == 0) { 975 error = EADDRNOTAVAIL; 976 mtx_unlock(&gif_mtx); 977 goto bad; 978 } 979 980 /* XXX both end must be valid? (I mean, not 0.0.0.0) */ 981 } 982 mtx_unlock(&gif_mtx); 983 984 /* XXX we can detach from both, but be polite just in case */ 985 if (sc->gif_psrc) 986 switch (sc->gif_psrc->sa_family) { 987#ifdef INET 988 case AF_INET: 989 (void)in_gif_detach(sc); 990 break; 991#endif 992#ifdef INET6 993 case AF_INET6: 994 (void)in6_gif_detach(sc); 995 break; 996#endif 997 } 998 999 osrc = sc->gif_psrc; 1000 sa = (struct sockaddr *)malloc(src->sa_len, M_IFADDR, M_WAITOK); 1001 bcopy((caddr_t)src, (caddr_t)sa, src->sa_len); 1002 sc->gif_psrc = sa; 1003 1004 odst = sc->gif_pdst; 1005 sa = (struct sockaddr *)malloc(dst->sa_len, M_IFADDR, M_WAITOK); 1006 bcopy((caddr_t)dst, (caddr_t)sa, dst->sa_len); 1007 sc->gif_pdst = sa; 1008 1009 switch (sc->gif_psrc->sa_family) { 1010#ifdef INET 1011 case AF_INET: 1012 error = in_gif_attach(sc); 1013 break; 1014#endif 1015#ifdef INET6 1016 case AF_INET6: 1017 /* 1018 * Check validity of the scope zone ID of the addresses, and 1019 * convert it into the kernel internal form if necessary. 1020 */ 1021 error = sa6_embedscope((struct sockaddr_in6 *)sc->gif_psrc, 0); 1022 if (error != 0) 1023 break; 1024 error = sa6_embedscope((struct sockaddr_in6 *)sc->gif_pdst, 0); 1025 if (error != 0) 1026 break; 1027 error = in6_gif_attach(sc); 1028 break; 1029#endif 1030 } 1031 if (error) { 1032 /* rollback */ 1033 free((caddr_t)sc->gif_psrc, M_IFADDR); 1034 free((caddr_t)sc->gif_pdst, M_IFADDR); 1035 sc->gif_psrc = osrc; 1036 sc->gif_pdst = odst; 1037 goto bad; 1038 } 1039 1040 if (osrc) 1041 free((caddr_t)osrc, M_IFADDR); 1042 if (odst) 1043 free((caddr_t)odst, M_IFADDR); 1044 1045 bad: 1046 if (sc->gif_psrc && sc->gif_pdst) 1047 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1048 else 1049 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1050 1051 return error; 1052} 1053 1054void 1055gif_delete_tunnel(ifp) 1056 struct ifnet *ifp; 1057{ 1058 struct gif_softc *sc = ifp->if_softc; 1059 1060 if (sc->gif_psrc) { 1061 free((caddr_t)sc->gif_psrc, M_IFADDR); 1062 sc->gif_psrc = NULL; 1063 } 1064 if (sc->gif_pdst) { 1065 free((caddr_t)sc->gif_pdst, M_IFADDR); 1066 sc->gif_pdst = NULL; 1067 } 1068 /* it is safe to detach from both */ 1069#ifdef INET 1070 (void)in_gif_detach(sc); 1071#endif 1072#ifdef INET6 1073 (void)in6_gif_detach(sc); 1074#endif 1075 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1076} 1077