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 static const char 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 static struct if_clone *gif_cloner; 110 111 static int gifmodevent(module_t, int, void *); 112 113 SYSCTL_DECL(_net_link); 114 static 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 127 static VNET_DEFINE(int, max_gif_nesting) = MAX_GIF_NEST; 128 #define V_max_gif_nesting VNET(max_gif_nesting) 129 SYSCTL_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 138 static VNET_DEFINE(int, parallel_tunnels) = 1; 139 #else 140 static VNET_DEFINE(int, parallel_tunnels) = 0; 141 #endif 142 #define V_parallel_tunnels VNET(parallel_tunnels) 143 SYSCTL_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 */ 147 static 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 153 154 static int 155 gif_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 } 200 201 static void 202 gif_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 } 238 239 static void 240 vnet_gif_init(const void *unused __unused) 241 { 242 243 LIST_INIT(&V_gif_softc_list); 244 } 245 VNET_SYSINIT(vnet_gif_init, SI_SUB_PSEUDO, SI_ORDER_MIDDLE, vnet_gif_init, 246 NULL); 247 248 static int 249 gifmodevent(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 } 271 272 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 #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 351 352 static void 353 gif_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 } 423 424 int 425 gif_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 } 529 530 void 531 gif_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; 549 550 #ifdef MAC 551 mac_ifnet_create_mbuf(ifp, m); 552 #endif 553 554 if (bpf_peers_present(ifp->if_bpf)) { 555 u_int32_t af1 = af; 556 bpf_mtap2(ifp->if_bpf, &af1, sizeof(af1), m); 557 } 558 559 if ((ifp->if_flags & IFF_MONITOR) != 0) { 560 ifp->if_ipackets++; 561 ifp->if_ibytes += m->m_pkthdr.len; 562 m_freem(m); 563 return; 564 } 565 566 if (ng_gif_input_p != NULL) { 567 (*ng_gif_input_p)(ifp, &m, af); 568 if (m == NULL) 569 return; 570 } 571 572 /* 573 * Put the packet to the network layer input queue according to the 574 * specified address family. 575 * Note: older versions of gif_input directly called network layer 576 * input functions, e.g. ip6_input, here. We changed the policy to 577 * prevent too many recursive calls of such input functions, which 578 * might cause kernel panic. But the change may introduce another 579 * problem; if the input queue is full, packets are discarded. 580 * The kernel stack overflow really happened, and we believed 581 * queue-full rarely occurs, so we changed the policy. 582 */ 583 switch (af) { 584 #ifdef INET 585 case AF_INET: 586 isr = NETISR_IP; 587 break; 588 #endif 589 #ifdef INET6 590 case AF_INET6: 591 isr = NETISR_IPV6; 592 break; 593 #endif 594 case AF_LINK: 595 n = sizeof(struct etherip_header) + sizeof(struct ether_header); 596 if (n > m->m_len) { 597 m = m_pullup(m, n); 598 if (m == NULL) { 599 ifp->if_ierrors++; 600 return; 601 } 602 } 603 604 eip = mtod(m, struct etherip_header *); 605 /* 606 * GIF_ACCEPT_REVETHIP (enabled by default) intentionally 607 * accepts an EtherIP packet with revered version field in 608 * the header. This is a knob for backward compatibility 609 * with FreeBSD 7.2R or prior. 610 */ 611 if (sc->gif_options & GIF_ACCEPT_REVETHIP) { 612 if (eip->eip_resvl != ETHERIP_VERSION 613 && eip->eip_ver != ETHERIP_VERSION) { 614 /* discard unknown versions */ 615 m_freem(m); 616 return; 617 } 618 } else { 619 if (eip->eip_ver != ETHERIP_VERSION) { 620 /* discard unknown versions */ 621 m_freem(m); 622 return; 623 } 624 } 625 m_adj(m, sizeof(struct etherip_header)); 626 627 m->m_flags &= ~(M_BCAST|M_MCAST); 628 m->m_pkthdr.rcvif = ifp; 629 630 if (ifp->if_bridge) { 631 oldifp = ifp; 632 eh = mtod(m, struct ether_header *); 633 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 634 if (ETHER_IS_BROADCAST(eh->ether_dhost)) 635 m->m_flags |= M_BCAST; 636 else 637 m->m_flags |= M_MCAST; 638 ifp->if_imcasts++; 639 } 640 BRIDGE_INPUT(ifp, m); 641 642 if (m != NULL && ifp != oldifp) { 643 /* 644 * The bridge gave us back itself or one of the 645 * members for which the frame is addressed. 646 */ 647 ether_demux(ifp, m); 648 return; 649 } 650 } 651 if (m != NULL) 652 m_freem(m); 653 return; 654 655 default: 656 if (ng_gif_input_orphan_p != NULL) 657 (*ng_gif_input_orphan_p)(ifp, m, af); 658 else 659 m_freem(m); 660 return; 661 } 662 663 ifp->if_ipackets++; 664 ifp->if_ibytes += m->m_pkthdr.len; 665 M_SETFIB(m, ifp->if_fib); 666 netisr_dispatch(isr, m); 667 } 668 669 /* XXX how should we handle IPv6 scope on SIOC[GS]IFPHYADDR? */ 670 int 671 gif_ioctl(ifp, cmd, data) 672 struct ifnet *ifp; 673 u_long cmd; 674 caddr_t data; 675 { 676 struct gif_softc *sc = ifp->if_softc; 677 struct ifreq *ifr = (struct ifreq*)data; 678 int error = 0, size; 679 u_int options; 680 struct sockaddr *dst, *src; 681 #ifdef SIOCSIFMTU /* xxx */ 682 u_long mtu; 683 #endif 684 685 switch (cmd) { 686 case SIOCSIFADDR: 687 ifp->if_flags |= IFF_UP; 688 break; 689 690 case SIOCSIFDSTADDR: 691 break; 692 693 case SIOCADDMULTI: 694 case SIOCDELMULTI: 695 break; 696 697 #ifdef SIOCSIFMTU /* xxx */ 698 case SIOCGIFMTU: 699 break; 700 701 case SIOCSIFMTU: 702 mtu = ifr->ifr_mtu; 703 if (mtu < GIF_MTU_MIN || mtu > GIF_MTU_MAX) 704 return (EINVAL); 705 ifp->if_mtu = mtu; 706 break; 707 #endif /* SIOCSIFMTU */ 708 709 #ifdef INET 710 case SIOCSIFPHYADDR: 711 #endif 712 #ifdef INET6 713 case SIOCSIFPHYADDR_IN6: 714 #endif /* INET6 */ 715 case SIOCSLIFPHYADDR: 716 switch (cmd) { 717 #ifdef INET 718 case SIOCSIFPHYADDR: 719 src = (struct sockaddr *) 720 &(((struct in_aliasreq *)data)->ifra_addr); 721 dst = (struct sockaddr *) 722 &(((struct in_aliasreq *)data)->ifra_dstaddr); 723 break; 724 #endif 725 #ifdef INET6 726 case SIOCSIFPHYADDR_IN6: 727 src = (struct sockaddr *) 728 &(((struct in6_aliasreq *)data)->ifra_addr); 729 dst = (struct sockaddr *) 730 &(((struct in6_aliasreq *)data)->ifra_dstaddr); 731 break; 732 #endif 733 case SIOCSLIFPHYADDR: 734 src = (struct sockaddr *) 735 &(((struct if_laddrreq *)data)->addr); 736 dst = (struct sockaddr *) 737 &(((struct if_laddrreq *)data)->dstaddr); 738 break; 739 default: 740 return EINVAL; 741 } 742 743 /* sa_family must be equal */ 744 if (src->sa_family != dst->sa_family) 745 return EINVAL; 746 747 /* validate sa_len */ 748 switch (src->sa_family) { 749 #ifdef INET 750 case AF_INET: 751 if (src->sa_len != sizeof(struct sockaddr_in)) 752 return EINVAL; 753 break; 754 #endif 755 #ifdef INET6 756 case AF_INET6: 757 if (src->sa_len != sizeof(struct sockaddr_in6)) 758 return EINVAL; 759 break; 760 #endif 761 default: 762 return EAFNOSUPPORT; 763 } 764 switch (dst->sa_family) { 765 #ifdef INET 766 case AF_INET: 767 if (dst->sa_len != sizeof(struct sockaddr_in)) 768 return EINVAL; 769 break; 770 #endif 771 #ifdef INET6 772 case AF_INET6: 773 if (dst->sa_len != sizeof(struct sockaddr_in6)) 774 return EINVAL; 775 break; 776 #endif 777 default: 778 return EAFNOSUPPORT; 779 } 780 781 /* check sa_family looks sane for the cmd */ 782 switch (cmd) { 783 case SIOCSIFPHYADDR: 784 if (src->sa_family == AF_INET) 785 break; 786 return EAFNOSUPPORT; 787 #ifdef INET6 788 case SIOCSIFPHYADDR_IN6: 789 if (src->sa_family == AF_INET6) 790 break; 791 return EAFNOSUPPORT; 792 #endif /* INET6 */ 793 case SIOCSLIFPHYADDR: 794 /* checks done in the above */ 795 break; 796 } 797 798 error = gif_set_tunnel(GIF2IFP(sc), src, dst); 799 break; 800 801 #ifdef SIOCDIFPHYADDR 802 case SIOCDIFPHYADDR: 803 gif_delete_tunnel(GIF2IFP(sc)); 804 break; 805 #endif 806 807 case SIOCGIFPSRCADDR: 808 #ifdef INET6 809 case SIOCGIFPSRCADDR_IN6: 810 #endif /* INET6 */ 811 if (sc->gif_psrc == NULL) { 812 error = EADDRNOTAVAIL; 813 goto bad; 814 } 815 src = sc->gif_psrc; 816 switch (cmd) { 817 #ifdef INET 818 case SIOCGIFPSRCADDR: 819 dst = &ifr->ifr_addr; 820 size = sizeof(ifr->ifr_addr); 821 break; 822 #endif /* INET */ 823 #ifdef INET6 824 case SIOCGIFPSRCADDR_IN6: 825 dst = (struct sockaddr *) 826 &(((struct in6_ifreq *)data)->ifr_addr); 827 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 828 break; 829 #endif /* INET6 */ 830 default: 831 error = EADDRNOTAVAIL; 832 goto bad; 833 } 834 if (src->sa_len > size) 835 return EINVAL; 836 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 837 #ifdef INET6 838 if (dst->sa_family == AF_INET6) { 839 error = sa6_recoverscope((struct sockaddr_in6 *)dst); 840 if (error != 0) 841 return (error); 842 } 843 #endif 844 break; 845 846 case SIOCGIFPDSTADDR: 847 #ifdef INET6 848 case SIOCGIFPDSTADDR_IN6: 849 #endif /* INET6 */ 850 if (sc->gif_pdst == NULL) { 851 error = EADDRNOTAVAIL; 852 goto bad; 853 } 854 src = sc->gif_pdst; 855 switch (cmd) { 856 #ifdef INET 857 case SIOCGIFPDSTADDR: 858 dst = &ifr->ifr_addr; 859 size = sizeof(ifr->ifr_addr); 860 break; 861 #endif /* INET */ 862 #ifdef INET6 863 case SIOCGIFPDSTADDR_IN6: 864 dst = (struct sockaddr *) 865 &(((struct in6_ifreq *)data)->ifr_addr); 866 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 867 break; 868 #endif /* INET6 */ 869 default: 870 error = EADDRNOTAVAIL; 871 goto bad; 872 } 873 if (src->sa_len > size) 874 return EINVAL; 875 error = prison_if(curthread->td_ucred, src); 876 if (error != 0) 877 return (error); 878 error = prison_if(curthread->td_ucred, dst); 879 if (error != 0) 880 return (error); 881 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 882 #ifdef INET6 883 if (dst->sa_family == AF_INET6) { 884 error = sa6_recoverscope((struct sockaddr_in6 *)dst); 885 if (error != 0) 886 return (error); 887 } 888 #endif 889 break; 890 891 case SIOCGLIFPHYADDR: 892 if (sc->gif_psrc == NULL || sc->gif_pdst == NULL) { 893 error = EADDRNOTAVAIL; 894 goto bad; 895 } 896 897 /* copy src */ 898 src = sc->gif_psrc; 899 dst = (struct sockaddr *) 900 &(((struct if_laddrreq *)data)->addr); 901 size = sizeof(((struct if_laddrreq *)data)->addr); 902 if (src->sa_len > size) 903 return EINVAL; 904 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 905 906 /* copy dst */ 907 src = sc->gif_pdst; 908 dst = (struct sockaddr *) 909 &(((struct if_laddrreq *)data)->dstaddr); 910 size = sizeof(((struct if_laddrreq *)data)->dstaddr); 911 if (src->sa_len > size) 912 return EINVAL; 913 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 914 break; 915 916 case SIOCSIFFLAGS: 917 /* if_ioctl() takes care of it */ 918 break; 919 920 case GIFGOPTS: 921 options = sc->gif_options; 922 error = copyout(&options, ifr->ifr_data, 923 sizeof(options)); 924 break; 925 926 case GIFSOPTS: 927 if ((error = priv_check(curthread, PRIV_NET_GIF)) != 0) 928 break; 929 error = copyin(ifr->ifr_data, &options, sizeof(options)); 930 if (error) 931 break; 932 if (options & ~GIF_OPTMASK) 933 error = EINVAL; 934 else 935 sc->gif_options = options; 936 break; 937 938 default: 939 error = EINVAL; 940 break; 941 } 942 bad: 943 return error; 944 } 945 946 /* 947 * XXXRW: There's a general event-ordering issue here: the code to check 948 * if a given tunnel is already present happens before we perform a 949 * potentially blocking setup of the tunnel. This code needs to be 950 * re-ordered so that the check and replacement can be atomic using 951 * a mutex. 952 */ 953 int 954 gif_set_tunnel(ifp, src, dst) 955 struct ifnet *ifp; 956 struct sockaddr *src; 957 struct sockaddr *dst; 958 { 959 struct gif_softc *sc = ifp->if_softc; 960 struct gif_softc *sc2; 961 struct sockaddr *osrc, *odst, *sa; 962 int error = 0; 963 964 mtx_lock(&gif_mtx); 965 LIST_FOREACH(sc2, &V_gif_softc_list, gif_list) { 966 if (sc2 == sc) 967 continue; 968 if (!sc2->gif_pdst || !sc2->gif_psrc) 969 continue; 970 if (sc2->gif_pdst->sa_family != dst->sa_family || 971 sc2->gif_pdst->sa_len != dst->sa_len || 972 sc2->gif_psrc->sa_family != src->sa_family || 973 sc2->gif_psrc->sa_len != src->sa_len) 974 continue; 975 976 /* 977 * Disallow parallel tunnels unless instructed 978 * otherwise. 979 */ 980 if (!V_parallel_tunnels && 981 bcmp(sc2->gif_pdst, dst, dst->sa_len) == 0 && 982 bcmp(sc2->gif_psrc, src, src->sa_len) == 0) { 983 error = EADDRNOTAVAIL; 984 mtx_unlock(&gif_mtx); 985 goto bad; 986 } 987 988 /* XXX both end must be valid? (I mean, not 0.0.0.0) */ 989 } 990 mtx_unlock(&gif_mtx); 991 992 /* XXX we can detach from both, but be polite just in case */ 993 if (sc->gif_psrc) 994 switch (sc->gif_psrc->sa_family) { 995 #ifdef INET 996 case AF_INET: 997 (void)in_gif_detach(sc); 998 break; 999 #endif 1000 #ifdef INET6 1001 case AF_INET6: 1002 (void)in6_gif_detach(sc); 1003 break; 1004 #endif 1005 } 1006 1007 osrc = sc->gif_psrc; 1008 sa = (struct sockaddr *)malloc(src->sa_len, M_IFADDR, M_WAITOK); 1009 bcopy((caddr_t)src, (caddr_t)sa, src->sa_len); 1010 sc->gif_psrc = sa; 1011 1012 odst = sc->gif_pdst; 1013 sa = (struct sockaddr *)malloc(dst->sa_len, M_IFADDR, M_WAITOK); 1014 bcopy((caddr_t)dst, (caddr_t)sa, dst->sa_len); 1015 sc->gif_pdst = sa; 1016 1017 switch (sc->gif_psrc->sa_family) { 1018 #ifdef INET 1019 case AF_INET: 1020 error = in_gif_attach(sc); 1021 break; 1022 #endif 1023 #ifdef INET6 1024 case AF_INET6: 1025 /* 1026 * Check validity of the scope zone ID of the addresses, and 1027 * convert it into the kernel internal form if necessary. 1028 */ 1029 error = sa6_embedscope((struct sockaddr_in6 *)sc->gif_psrc, 0); 1030 if (error != 0) 1031 break; 1032 error = sa6_embedscope((struct sockaddr_in6 *)sc->gif_pdst, 0); 1033 if (error != 0) 1034 break; 1035 error = in6_gif_attach(sc); 1036 break; 1037 #endif 1038 } 1039 if (error) { 1040 /* rollback */ 1041 free((caddr_t)sc->gif_psrc, M_IFADDR); 1042 free((caddr_t)sc->gif_pdst, M_IFADDR); 1043 sc->gif_psrc = osrc; 1044 sc->gif_pdst = odst; 1045 goto bad; 1046 } 1047 1048 if (osrc) 1049 free((caddr_t)osrc, M_IFADDR); 1050 if (odst) 1051 free((caddr_t)odst, M_IFADDR); 1052 1053 bad: 1054 if (sc->gif_psrc && sc->gif_pdst) 1055 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1056 else 1057 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1058 1059 return error; 1060 } 1061 1062 void 1063 gif_delete_tunnel(ifp) 1064 struct ifnet *ifp; 1065 { 1066 struct gif_softc *sc = ifp->if_softc; 1067 1068 if (sc->gif_psrc) { 1069 free((caddr_t)sc->gif_psrc, M_IFADDR); 1070 sc->gif_psrc = NULL; 1071 } 1072 if (sc->gif_pdst) { 1073 free((caddr_t)sc->gif_pdst, M_IFADDR); 1074 sc->gif_pdst = NULL; 1075 } 1076 /* it is safe to detach from both */ 1077 #ifdef INET 1078 (void)in_gif_detach(sc); 1079 #endif 1080 #ifdef INET6 1081 (void)in6_gif_detach(sc); 1082 #endif 1083 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1084 } 1085