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