if_gif.c revision 273859
1/* $FreeBSD: stable/10/sys/net/if_gif.c 273859 2014-10-30 13:53:57Z ae $ */ 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 = 0; 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 if ((ifp->if_flags & IFF_MONITOR) != 0) { 441 error = ENETDOWN; 442 m_freem(m); 443 goto end; 444 } 445 446 /* 447 * gif may cause infinite recursion calls when misconfigured. 448 * We'll prevent this by detecting loops. 449 * 450 * High nesting level may cause stack exhaustion. 451 * We'll prevent this by introducing upper limit. 452 */ 453 gif_called = 1; 454 mtag = m_tag_locate(m, MTAG_GIF, MTAG_GIF_CALLED, NULL); 455 while (mtag != NULL) { 456 if (*(struct ifnet **)(mtag + 1) == ifp) { 457 log(LOG_NOTICE, 458 "gif_output: loop detected on %s\n", 459 (*(struct ifnet **)(mtag + 1))->if_xname); 460 m_freem(m); 461 error = EIO; /* is there better errno? */ 462 goto end; 463 } 464 mtag = m_tag_locate(m, MTAG_GIF, MTAG_GIF_CALLED, mtag); 465 gif_called++; 466 } 467 if (gif_called > V_max_gif_nesting) { 468 log(LOG_NOTICE, 469 "gif_output: recursively called too many times(%d)\n", 470 gif_called); 471 m_freem(m); 472 error = EIO; /* is there better errno? */ 473 goto end; 474 } 475 mtag = m_tag_alloc(MTAG_GIF, MTAG_GIF_CALLED, sizeof(struct ifnet *), 476 M_NOWAIT); 477 if (mtag == NULL) { 478 m_freem(m); 479 error = ENOMEM; 480 goto end; 481 } 482 *(struct ifnet **)(mtag + 1) = ifp; 483 m_tag_prepend(m, mtag); 484 485 m->m_flags &= ~(M_BCAST|M_MCAST); 486 /* BPF writes need to be handled specially. */ 487 if (dst->sa_family == AF_UNSPEC) 488 bcopy(dst->sa_data, &af, sizeof(af)); 489 else 490 af = dst->sa_family; 491 /* 492 * Now save the af in the inbound pkt csum 493 * data, this is a cheat since we are using 494 * the inbound csum_data field to carry the 495 * af over to the gif_start() routine, avoiding 496 * using yet another mtag. 497 */ 498 m->m_pkthdr.csum_data = af; 499 if (!(ifp->if_flags & IFF_UP) || 500 sc->gif_psrc == NULL || sc->gif_pdst == NULL) { 501 m_freem(m); 502 error = ENETDOWN; 503 goto end; 504 } 505#ifdef ALTQ 506 /* 507 * Make altq aware of the bytes we will add 508 * when we actually send it. 509 */ 510#ifdef INET 511 if (sc->gif_psrc->sa_family == AF_INET) 512 m->m_pkthdr.len += GIF_HDR_LEN; 513#endif 514#ifdef INET6 515 if (sc->gif_psrc->sa_family == AF_INET6) 516 m->m_pkthdr.len += GIF_HDR_LEN6; 517#endif 518#endif 519 /* 520 * Queue message on interface, update output statistics if 521 * successful, and start output if interface not yet active. 522 */ 523 IFQ_HANDOFF(ifp, m, error); 524 end: 525 if (error) 526 ifp->if_oerrors++; 527 return (error); 528} 529 530void 531gif_input(m, af, ifp) 532 struct mbuf *m; 533 int af; 534 struct ifnet *ifp; 535{ 536 int isr, n; 537 struct gif_softc *sc; 538 struct etherip_header *eip; 539 struct ether_header *eh; 540 struct ifnet *oldifp; 541 542 if (ifp == NULL) { 543 /* just in case */ 544 m_freem(m); 545 return; 546 } 547 sc = ifp->if_softc; 548 m->m_pkthdr.rcvif = ifp; 549 m_clrprotoflags(m); 550 551#ifdef MAC 552 mac_ifnet_create_mbuf(ifp, m); 553#endif 554 555 if (bpf_peers_present(ifp->if_bpf)) { 556 u_int32_t af1 = af; 557 bpf_mtap2(ifp->if_bpf, &af1, sizeof(af1), m); 558 } 559 560 if ((ifp->if_flags & IFF_MONITOR) != 0) { 561 ifp->if_ipackets++; 562 ifp->if_ibytes += m->m_pkthdr.len; 563 m_freem(m); 564 return; 565 } 566 567 if (ng_gif_input_p != NULL) { 568 (*ng_gif_input_p)(ifp, &m, af); 569 if (m == NULL) 570 return; 571 } 572 573 /* 574 * Put the packet to the network layer input queue according to the 575 * specified address family. 576 * Note: older versions of gif_input directly called network layer 577 * input functions, e.g. ip6_input, here. We changed the policy to 578 * prevent too many recursive calls of such input functions, which 579 * might cause kernel panic. But the change may introduce another 580 * problem; if the input queue is full, packets are discarded. 581 * The kernel stack overflow really happened, and we believed 582 * queue-full rarely occurs, so we changed the policy. 583 */ 584 switch (af) { 585#ifdef INET 586 case AF_INET: 587 isr = NETISR_IP; 588 break; 589#endif 590#ifdef INET6 591 case AF_INET6: 592 isr = NETISR_IPV6; 593 break; 594#endif 595 case AF_LINK: 596 n = sizeof(struct etherip_header) + sizeof(struct ether_header); 597 if (n > m->m_len) { 598 m = m_pullup(m, n); 599 if (m == NULL) { 600 ifp->if_ierrors++; 601 return; 602 } 603 } 604 605 eip = mtod(m, struct etherip_header *); 606 /* 607 * GIF_ACCEPT_REVETHIP (enabled by default) intentionally 608 * accepts an EtherIP packet with revered version field in 609 * the header. This is a knob for backward compatibility 610 * with FreeBSD 7.2R or prior. 611 */ 612 if (sc->gif_options & GIF_ACCEPT_REVETHIP) { 613 if (eip->eip_resvl != ETHERIP_VERSION 614 && eip->eip_ver != ETHERIP_VERSION) { 615 /* discard unknown versions */ 616 m_freem(m); 617 return; 618 } 619 } else { 620 if (eip->eip_ver != ETHERIP_VERSION) { 621 /* discard unknown versions */ 622 m_freem(m); 623 return; 624 } 625 } 626 m_adj(m, sizeof(struct etherip_header)); 627 628 m->m_flags &= ~(M_BCAST|M_MCAST); 629 m->m_pkthdr.rcvif = ifp; 630 631 if (ifp->if_bridge) { 632 oldifp = ifp; 633 eh = mtod(m, struct ether_header *); 634 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 635 if (ETHER_IS_BROADCAST(eh->ether_dhost)) 636 m->m_flags |= M_BCAST; 637 else 638 m->m_flags |= M_MCAST; 639 ifp->if_imcasts++; 640 } 641 BRIDGE_INPUT(ifp, m); 642 643 if (m != NULL && ifp != oldifp) { 644 /* 645 * The bridge gave us back itself or one of the 646 * members for which the frame is addressed. 647 */ 648 ether_demux(ifp, m); 649 return; 650 } 651 } 652 if (m != NULL) 653 m_freem(m); 654 return; 655 656 default: 657 if (ng_gif_input_orphan_p != NULL) 658 (*ng_gif_input_orphan_p)(ifp, m, af); 659 else 660 m_freem(m); 661 return; 662 } 663 664 ifp->if_ipackets++; 665 ifp->if_ibytes += m->m_pkthdr.len; 666 M_SETFIB(m, ifp->if_fib); 667 netisr_dispatch(isr, m); 668} 669 670/* XXX how should we handle IPv6 scope on SIOC[GS]IFPHYADDR? */ 671int 672gif_ioctl(ifp, cmd, data) 673 struct ifnet *ifp; 674 u_long cmd; 675 caddr_t data; 676{ 677 struct gif_softc *sc = ifp->if_softc; 678 struct ifreq *ifr = (struct ifreq*)data; 679 int error = 0, size; 680 u_int options; 681 struct sockaddr *dst, *src; 682#ifdef SIOCSIFMTU /* xxx */ 683 u_long mtu; 684#endif 685 686 switch (cmd) { 687 case SIOCSIFADDR: 688 ifp->if_flags |= IFF_UP; 689 break; 690 691 case SIOCADDMULTI: 692 case SIOCDELMULTI: 693 break; 694 695#ifdef SIOCSIFMTU /* xxx */ 696 case SIOCGIFMTU: 697 break; 698 699 case SIOCSIFMTU: 700 mtu = ifr->ifr_mtu; 701 if (mtu < GIF_MTU_MIN || mtu > GIF_MTU_MAX) 702 return (EINVAL); 703 ifp->if_mtu = mtu; 704 break; 705#endif /* SIOCSIFMTU */ 706 707#ifdef INET 708 case SIOCSIFPHYADDR: 709#endif 710#ifdef INET6 711 case SIOCSIFPHYADDR_IN6: 712#endif /* INET6 */ 713 case SIOCSLIFPHYADDR: 714 switch (cmd) { 715#ifdef INET 716 case SIOCSIFPHYADDR: 717 src = (struct sockaddr *) 718 &(((struct in_aliasreq *)data)->ifra_addr); 719 dst = (struct sockaddr *) 720 &(((struct in_aliasreq *)data)->ifra_dstaddr); 721 break; 722#endif 723#ifdef INET6 724 case SIOCSIFPHYADDR_IN6: 725 src = (struct sockaddr *) 726 &(((struct in6_aliasreq *)data)->ifra_addr); 727 dst = (struct sockaddr *) 728 &(((struct in6_aliasreq *)data)->ifra_dstaddr); 729 break; 730#endif 731 case SIOCSLIFPHYADDR: 732 src = (struct sockaddr *) 733 &(((struct if_laddrreq *)data)->addr); 734 dst = (struct sockaddr *) 735 &(((struct if_laddrreq *)data)->dstaddr); 736 break; 737 default: 738 return EINVAL; 739 } 740 741 /* sa_family must be equal */ 742 if (src->sa_family != dst->sa_family) 743 return EINVAL; 744 745 /* validate sa_len */ 746 switch (src->sa_family) { 747#ifdef INET 748 case AF_INET: 749 if (src->sa_len != sizeof(struct sockaddr_in)) 750 return EINVAL; 751 break; 752#endif 753#ifdef INET6 754 case AF_INET6: 755 if (src->sa_len != sizeof(struct sockaddr_in6)) 756 return EINVAL; 757 break; 758#endif 759 default: 760 return EAFNOSUPPORT; 761 } 762 switch (dst->sa_family) { 763#ifdef INET 764 case AF_INET: 765 if (dst->sa_len != sizeof(struct sockaddr_in)) 766 return EINVAL; 767 break; 768#endif 769#ifdef INET6 770 case AF_INET6: 771 if (dst->sa_len != sizeof(struct sockaddr_in6)) 772 return EINVAL; 773 break; 774#endif 775 default: 776 return EAFNOSUPPORT; 777 } 778 779 /* check sa_family looks sane for the cmd */ 780 switch (cmd) { 781 case SIOCSIFPHYADDR: 782 if (src->sa_family == AF_INET) 783 break; 784 return EAFNOSUPPORT; 785#ifdef INET6 786 case SIOCSIFPHYADDR_IN6: 787 if (src->sa_family == AF_INET6) 788 break; 789 return EAFNOSUPPORT; 790#endif /* INET6 */ 791 case SIOCSLIFPHYADDR: 792 /* checks done in the above */ 793 break; 794 } 795 796 error = gif_set_tunnel(GIF2IFP(sc), src, dst); 797 break; 798 799#ifdef SIOCDIFPHYADDR 800 case SIOCDIFPHYADDR: 801 gif_delete_tunnel(GIF2IFP(sc)); 802 break; 803#endif 804 805 case SIOCGIFPSRCADDR: 806#ifdef INET6 807 case SIOCGIFPSRCADDR_IN6: 808#endif /* INET6 */ 809 if (sc->gif_psrc == NULL) { 810 error = EADDRNOTAVAIL; 811 goto bad; 812 } 813 src = sc->gif_psrc; 814 switch (cmd) { 815#ifdef INET 816 case SIOCGIFPSRCADDR: 817 dst = &ifr->ifr_addr; 818 size = sizeof(ifr->ifr_addr); 819 break; 820#endif /* INET */ 821#ifdef INET6 822 case SIOCGIFPSRCADDR_IN6: 823 dst = (struct sockaddr *) 824 &(((struct in6_ifreq *)data)->ifr_addr); 825 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 826 break; 827#endif /* INET6 */ 828 default: 829 error = EADDRNOTAVAIL; 830 goto bad; 831 } 832 if (src->sa_len > size) 833 return EINVAL; 834 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 835#ifdef INET6 836 if (dst->sa_family == AF_INET6) { 837 error = sa6_recoverscope((struct sockaddr_in6 *)dst); 838 if (error != 0) 839 return (error); 840 } 841#endif 842 break; 843 844 case SIOCGIFPDSTADDR: 845#ifdef INET6 846 case SIOCGIFPDSTADDR_IN6: 847#endif /* INET6 */ 848 if (sc->gif_pdst == NULL) { 849 error = EADDRNOTAVAIL; 850 goto bad; 851 } 852 src = sc->gif_pdst; 853 switch (cmd) { 854#ifdef INET 855 case SIOCGIFPDSTADDR: 856 dst = &ifr->ifr_addr; 857 size = sizeof(ifr->ifr_addr); 858 break; 859#endif /* INET */ 860#ifdef INET6 861 case SIOCGIFPDSTADDR_IN6: 862 dst = (struct sockaddr *) 863 &(((struct in6_ifreq *)data)->ifr_addr); 864 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 865 break; 866#endif /* INET6 */ 867 default: 868 error = EADDRNOTAVAIL; 869 goto bad; 870 } 871 if (src->sa_len > size) 872 return EINVAL; 873 error = prison_if(curthread->td_ucred, src); 874 if (error != 0) 875 return (error); 876 error = prison_if(curthread->td_ucred, dst); 877 if (error != 0) 878 return (error); 879 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 880#ifdef INET6 881 if (dst->sa_family == AF_INET6) { 882 error = sa6_recoverscope((struct sockaddr_in6 *)dst); 883 if (error != 0) 884 return (error); 885 } 886#endif 887 break; 888 889 case SIOCGLIFPHYADDR: 890 if (sc->gif_psrc == NULL || sc->gif_pdst == NULL) { 891 error = EADDRNOTAVAIL; 892 goto bad; 893 } 894 895 /* copy src */ 896 src = sc->gif_psrc; 897 dst = (struct sockaddr *) 898 &(((struct if_laddrreq *)data)->addr); 899 size = sizeof(((struct if_laddrreq *)data)->addr); 900 if (src->sa_len > size) 901 return EINVAL; 902 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 903 904 /* copy dst */ 905 src = sc->gif_pdst; 906 dst = (struct sockaddr *) 907 &(((struct if_laddrreq *)data)->dstaddr); 908 size = sizeof(((struct if_laddrreq *)data)->dstaddr); 909 if (src->sa_len > size) 910 return EINVAL; 911 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 912 break; 913 914 case SIOCSIFFLAGS: 915 /* if_ioctl() takes care of it */ 916 break; 917 918 case GIFGOPTS: 919 options = sc->gif_options; 920 error = copyout(&options, ifr->ifr_data, 921 sizeof(options)); 922 break; 923 924 case GIFSOPTS: 925 if ((error = priv_check(curthread, PRIV_NET_GIF)) != 0) 926 break; 927 error = copyin(ifr->ifr_data, &options, sizeof(options)); 928 if (error) 929 break; 930 if (options & ~GIF_OPTMASK) 931 error = EINVAL; 932 else 933 sc->gif_options = options; 934 break; 935 936 default: 937 error = EINVAL; 938 break; 939 } 940 bad: 941 return error; 942} 943 944/* 945 * XXXRW: There's a general event-ordering issue here: the code to check 946 * if a given tunnel is already present happens before we perform a 947 * potentially blocking setup of the tunnel. This code needs to be 948 * re-ordered so that the check and replacement can be atomic using 949 * a mutex. 950 */ 951int 952gif_set_tunnel(ifp, src, dst) 953 struct ifnet *ifp; 954 struct sockaddr *src; 955 struct sockaddr *dst; 956{ 957 struct gif_softc *sc = ifp->if_softc; 958 struct gif_softc *sc2; 959 struct sockaddr *osrc, *odst, *sa; 960 int error = 0; 961 962 mtx_lock(&gif_mtx); 963 LIST_FOREACH(sc2, &V_gif_softc_list, gif_list) { 964 if (sc2 == sc) 965 continue; 966 if (!sc2->gif_pdst || !sc2->gif_psrc) 967 continue; 968 if (sc2->gif_pdst->sa_family != dst->sa_family || 969 sc2->gif_pdst->sa_len != dst->sa_len || 970 sc2->gif_psrc->sa_family != src->sa_family || 971 sc2->gif_psrc->sa_len != src->sa_len) 972 continue; 973 974 /* 975 * Disallow parallel tunnels unless instructed 976 * otherwise. 977 */ 978 if (!V_parallel_tunnels && 979 bcmp(sc2->gif_pdst, dst, dst->sa_len) == 0 && 980 bcmp(sc2->gif_psrc, src, src->sa_len) == 0) { 981 error = EADDRNOTAVAIL; 982 mtx_unlock(&gif_mtx); 983 goto bad; 984 } 985 986 /* XXX both end must be valid? (I mean, not 0.0.0.0) */ 987 } 988 mtx_unlock(&gif_mtx); 989 990 /* XXX we can detach from both, but be polite just in case */ 991 if (sc->gif_psrc) 992 switch (sc->gif_psrc->sa_family) { 993#ifdef INET 994 case AF_INET: 995 (void)in_gif_detach(sc); 996 break; 997#endif 998#ifdef INET6 999 case AF_INET6: 1000 (void)in6_gif_detach(sc); 1001 break; 1002#endif 1003 } 1004 1005 osrc = sc->gif_psrc; 1006 sa = (struct sockaddr *)malloc(src->sa_len, M_IFADDR, M_WAITOK); 1007 bcopy((caddr_t)src, (caddr_t)sa, src->sa_len); 1008 sc->gif_psrc = sa; 1009 1010 odst = sc->gif_pdst; 1011 sa = (struct sockaddr *)malloc(dst->sa_len, M_IFADDR, M_WAITOK); 1012 bcopy((caddr_t)dst, (caddr_t)sa, dst->sa_len); 1013 sc->gif_pdst = sa; 1014 1015 switch (sc->gif_psrc->sa_family) { 1016#ifdef INET 1017 case AF_INET: 1018 error = in_gif_attach(sc); 1019 break; 1020#endif 1021#ifdef INET6 1022 case AF_INET6: 1023 /* 1024 * Check validity of the scope zone ID of the addresses, and 1025 * convert it into the kernel internal form if necessary. 1026 */ 1027 error = sa6_embedscope((struct sockaddr_in6 *)sc->gif_psrc, 0); 1028 if (error != 0) 1029 break; 1030 error = sa6_embedscope((struct sockaddr_in6 *)sc->gif_pdst, 0); 1031 if (error != 0) 1032 break; 1033 error = in6_gif_attach(sc); 1034 break; 1035#endif 1036 } 1037 if (error) { 1038 /* rollback */ 1039 free((caddr_t)sc->gif_psrc, M_IFADDR); 1040 free((caddr_t)sc->gif_pdst, M_IFADDR); 1041 sc->gif_psrc = osrc; 1042 sc->gif_pdst = odst; 1043 goto bad; 1044 } 1045 1046 if (osrc) 1047 free((caddr_t)osrc, M_IFADDR); 1048 if (odst) 1049 free((caddr_t)odst, M_IFADDR); 1050 1051 bad: 1052 if (sc->gif_psrc && sc->gif_pdst) 1053 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1054 else 1055 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1056 1057 return error; 1058} 1059 1060void 1061gif_delete_tunnel(ifp) 1062 struct ifnet *ifp; 1063{ 1064 struct gif_softc *sc = ifp->if_softc; 1065 1066 if (sc->gif_psrc) { 1067 free((caddr_t)sc->gif_psrc, M_IFADDR); 1068 sc->gif_psrc = NULL; 1069 } 1070 if (sc->gif_pdst) { 1071 free((caddr_t)sc->gif_pdst, M_IFADDR); 1072 sc->gif_pdst = NULL; 1073 } 1074 /* it is safe to detach from both */ 1075#ifdef INET 1076 (void)in_gif_detach(sc); 1077#endif 1078#ifdef INET6 1079 (void)in6_gif_detach(sc); 1080#endif 1081 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1082} 1083