Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/net/if_gre.c
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1 /*- 2 * Copyright (c) 1998 The NetBSD Foundation, Inc. 3 * Copyright (c) 2014 Andrey V. Elsukov <ae@FreeBSD.org> 4 * All rights reserved. 5 * 6 * This code is derived from software contributed to The NetBSD Foundation 7 * by Heiko W.Rupp <hwr@pilhuhn.de> 8 * 9 * IPv6-over-GRE contributed by Gert Doering <gert@greenie.muc.de> 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 * 32 * $NetBSD: if_gre.c,v 1.49 2003/12/11 00:22:29 itojun Exp $ 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD: releng/11.0/sys/net/if_gre.c 297793 2016-04-10 23:07:00Z pfg $"); 37 38 #include "opt_inet.h" 39 #include "opt_inet6.h" 40 41 #include <sys/param.h> 42 #include <sys/jail.h> 43 #include <sys/kernel.h> 44 #include <sys/lock.h> 45 #include <sys/libkern.h> 46 #include <sys/malloc.h> 47 #include <sys/module.h> 48 #include <sys/mbuf.h> 49 #include <sys/priv.h> 50 #include <sys/proc.h> 51 #include <sys/protosw.h> 52 #include <sys/rmlock.h> 53 #include <sys/socket.h> 54 #include <sys/sockio.h> 55 #include <sys/sx.h> 56 #include <sys/sysctl.h> 57 #include <sys/syslog.h> 58 #include <sys/systm.h> 59 60 #include <net/ethernet.h> 61 #include <net/if.h> 62 #include <net/if_var.h> 63 #include <net/if_clone.h> 64 #include <net/if_types.h> 65 #include <net/netisr.h> 66 #include <net/vnet.h> 67 #include <net/route.h> 68 69 #include <netinet/in.h> 70 #ifdef INET 71 #include <netinet/in_systm.h> 72 #include <netinet/in_var.h> 73 #include <netinet/ip.h> 74 #include <netinet/ip_var.h> 75 #endif 76 77 #ifdef INET6 78 #include <netinet/ip6.h> 79 #include <netinet6/in6_var.h> 80 #include <netinet6/ip6_var.h> 81 #include <netinet6/scope6_var.h> 82 #endif 83 84 #include <netinet/ip_encap.h> 85 #include <net/bpf.h> 86 #include <net/if_gre.h> 87 88 #include <machine/in_cksum.h> 89 #include <security/mac/mac_framework.h> 90 91 #define GREMTU 1500 92 static const char grename[] = "gre"; 93 static MALLOC_DEFINE(M_GRE, grename, "Generic Routing Encapsulation"); 94 static VNET_DEFINE(struct mtx, gre_mtx); 95 #define V_gre_mtx VNET(gre_mtx) 96 #define GRE_LIST_LOCK_INIT(x) mtx_init(&V_gre_mtx, "gre_mtx", NULL, \ 97 MTX_DEF) 98 #define GRE_LIST_LOCK_DESTROY(x) mtx_destroy(&V_gre_mtx) 99 #define GRE_LIST_LOCK(x) mtx_lock(&V_gre_mtx) 100 #define GRE_LIST_UNLOCK(x) mtx_unlock(&V_gre_mtx) 101 102 static VNET_DEFINE(LIST_HEAD(, gre_softc), gre_softc_list); 103 #define V_gre_softc_list VNET(gre_softc_list) 104 static struct sx gre_ioctl_sx; 105 SX_SYSINIT(gre_ioctl_sx, &gre_ioctl_sx, "gre_ioctl"); 106 107 static int gre_clone_create(struct if_clone *, int, caddr_t); 108 static void gre_clone_destroy(struct ifnet *); 109 static VNET_DEFINE(struct if_clone *, gre_cloner); 110 #define V_gre_cloner VNET(gre_cloner) 111 112 static void gre_qflush(struct ifnet *); 113 static int gre_transmit(struct ifnet *, struct mbuf *); 114 static int gre_ioctl(struct ifnet *, u_long, caddr_t); 115 static int gre_output(struct ifnet *, struct mbuf *, 116 const struct sockaddr *, struct route *); 117 118 static void gre_updatehdr(struct gre_softc *); 119 static int gre_set_tunnel(struct ifnet *, struct sockaddr *, 120 struct sockaddr *); 121 static void gre_delete_tunnel(struct ifnet *); 122 123 SYSCTL_DECL(_net_link); 124 static SYSCTL_NODE(_net_link, IFT_TUNNEL, gre, CTLFLAG_RW, 0, 125 "Generic Routing Encapsulation"); 126 #ifndef MAX_GRE_NEST 127 /* 128 * This macro controls the default upper limitation on nesting of gre tunnels. 129 * Since, setting a large value to this macro with a careless configuration 130 * may introduce system crash, we don't allow any nestings by default. 131 * If you need to configure nested gre tunnels, you can define this macro 132 * in your kernel configuration file. However, if you do so, please be 133 * careful to configure the tunnels so that it won't make a loop. 134 */ 135 #define MAX_GRE_NEST 1 136 #endif 137 138 static VNET_DEFINE(int, max_gre_nesting) = MAX_GRE_NEST; 139 #define V_max_gre_nesting VNET(max_gre_nesting) 140 SYSCTL_INT(_net_link_gre, OID_AUTO, max_nesting, CTLFLAG_RW | CTLFLAG_VNET, 141 &VNET_NAME(max_gre_nesting), 0, "Max nested tunnels"); 142 143 static void 144 vnet_gre_init(const void *unused __unused) 145 { 146 LIST_INIT(&V_gre_softc_list); 147 GRE_LIST_LOCK_INIT(); 148 V_gre_cloner = if_clone_simple(grename, gre_clone_create, 149 gre_clone_destroy, 0); 150 } 151 VNET_SYSINIT(vnet_gre_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY, 152 vnet_gre_init, NULL); 153 154 static void 155 vnet_gre_uninit(const void *unused __unused) 156 { 157 158 if_clone_detach(V_gre_cloner); 159 GRE_LIST_LOCK_DESTROY(); 160 } 161 VNET_SYSUNINIT(vnet_gre_uninit, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY, 162 vnet_gre_uninit, NULL); 163 164 static int 165 gre_clone_create(struct if_clone *ifc, int unit, caddr_t params) 166 { 167 struct gre_softc *sc; 168 169 sc = malloc(sizeof(struct gre_softc), M_GRE, M_WAITOK | M_ZERO); 170 sc->gre_fibnum = curthread->td_proc->p_fibnum; 171 GRE2IFP(sc) = if_alloc(IFT_TUNNEL); 172 GRE_LOCK_INIT(sc); 173 GRE2IFP(sc)->if_softc = sc; 174 if_initname(GRE2IFP(sc), grename, unit); 175 176 GRE2IFP(sc)->if_mtu = sc->gre_mtu = GREMTU; 177 GRE2IFP(sc)->if_flags = IFF_POINTOPOINT|IFF_MULTICAST; 178 GRE2IFP(sc)->if_output = gre_output; 179 GRE2IFP(sc)->if_ioctl = gre_ioctl; 180 GRE2IFP(sc)->if_transmit = gre_transmit; 181 GRE2IFP(sc)->if_qflush = gre_qflush; 182 GRE2IFP(sc)->if_capabilities |= IFCAP_LINKSTATE; 183 GRE2IFP(sc)->if_capenable |= IFCAP_LINKSTATE; 184 if_attach(GRE2IFP(sc)); 185 bpfattach(GRE2IFP(sc), DLT_NULL, sizeof(u_int32_t)); 186 GRE_LIST_LOCK(); 187 LIST_INSERT_HEAD(&V_gre_softc_list, sc, gre_list); 188 GRE_LIST_UNLOCK(); 189 return (0); 190 } 191 192 static void 193 gre_clone_destroy(struct ifnet *ifp) 194 { 195 struct gre_softc *sc; 196 197 sx_xlock(&gre_ioctl_sx); 198 sc = ifp->if_softc; 199 gre_delete_tunnel(ifp); 200 GRE_LIST_LOCK(); 201 LIST_REMOVE(sc, gre_list); 202 GRE_LIST_UNLOCK(); 203 bpfdetach(ifp); 204 if_detach(ifp); 205 ifp->if_softc = NULL; 206 sx_xunlock(&gre_ioctl_sx); 207 208 if_free(ifp); 209 GRE_LOCK_DESTROY(sc); 210 free(sc, M_GRE); 211 } 212 213 static int 214 gre_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 215 { 216 GRE_RLOCK_TRACKER; 217 struct ifreq *ifr = (struct ifreq *)data; 218 struct sockaddr *src, *dst; 219 struct gre_softc *sc; 220 #ifdef INET 221 struct sockaddr_in *sin = NULL; 222 #endif 223 #ifdef INET6 224 struct sockaddr_in6 *sin6 = NULL; 225 #endif 226 uint32_t opt; 227 int error; 228 229 switch (cmd) { 230 case SIOCSIFMTU: 231 /* XXX: */ 232 if (ifr->ifr_mtu < 576) 233 return (EINVAL); 234 break; 235 case SIOCSIFADDR: 236 ifp->if_flags |= IFF_UP; 237 case SIOCSIFFLAGS: 238 case SIOCADDMULTI: 239 case SIOCDELMULTI: 240 return (0); 241 case GRESADDRS: 242 case GRESADDRD: 243 case GREGADDRS: 244 case GREGADDRD: 245 case GRESPROTO: 246 case GREGPROTO: 247 return (EOPNOTSUPP); 248 } 249 src = dst = NULL; 250 sx_xlock(&gre_ioctl_sx); 251 sc = ifp->if_softc; 252 if (sc == NULL) { 253 error = ENXIO; 254 goto end; 255 } 256 error = 0; 257 switch (cmd) { 258 case SIOCSIFMTU: 259 GRE_WLOCK(sc); 260 sc->gre_mtu = ifr->ifr_mtu; 261 gre_updatehdr(sc); 262 GRE_WUNLOCK(sc); 263 goto end; 264 case SIOCSIFPHYADDR: 265 #ifdef INET6 266 case SIOCSIFPHYADDR_IN6: 267 #endif 268 error = EINVAL; 269 switch (cmd) { 270 #ifdef INET 271 case SIOCSIFPHYADDR: 272 src = (struct sockaddr *) 273 &(((struct in_aliasreq *)data)->ifra_addr); 274 dst = (struct sockaddr *) 275 &(((struct in_aliasreq *)data)->ifra_dstaddr); 276 break; 277 #endif 278 #ifdef INET6 279 case SIOCSIFPHYADDR_IN6: 280 src = (struct sockaddr *) 281 &(((struct in6_aliasreq *)data)->ifra_addr); 282 dst = (struct sockaddr *) 283 &(((struct in6_aliasreq *)data)->ifra_dstaddr); 284 break; 285 #endif 286 default: 287 error = EAFNOSUPPORT; 288 goto end; 289 } 290 /* sa_family must be equal */ 291 if (src->sa_family != dst->sa_family || 292 src->sa_len != dst->sa_len) 293 goto end; 294 295 /* validate sa_len */ 296 switch (src->sa_family) { 297 #ifdef INET 298 case AF_INET: 299 if (src->sa_len != sizeof(struct sockaddr_in)) 300 goto end; 301 break; 302 #endif 303 #ifdef INET6 304 case AF_INET6: 305 if (src->sa_len != sizeof(struct sockaddr_in6)) 306 goto end; 307 break; 308 #endif 309 default: 310 error = EAFNOSUPPORT; 311 goto end; 312 } 313 /* check sa_family looks sane for the cmd */ 314 error = EAFNOSUPPORT; 315 switch (cmd) { 316 #ifdef INET 317 case SIOCSIFPHYADDR: 318 if (src->sa_family == AF_INET) 319 break; 320 goto end; 321 #endif 322 #ifdef INET6 323 case SIOCSIFPHYADDR_IN6: 324 if (src->sa_family == AF_INET6) 325 break; 326 goto end; 327 #endif 328 } 329 error = EADDRNOTAVAIL; 330 switch (src->sa_family) { 331 #ifdef INET 332 case AF_INET: 333 if (satosin(src)->sin_addr.s_addr == INADDR_ANY || 334 satosin(dst)->sin_addr.s_addr == INADDR_ANY) 335 goto end; 336 break; 337 #endif 338 #ifdef INET6 339 case AF_INET6: 340 if (IN6_IS_ADDR_UNSPECIFIED(&satosin6(src)->sin6_addr) 341 || 342 IN6_IS_ADDR_UNSPECIFIED(&satosin6(dst)->sin6_addr)) 343 goto end; 344 /* 345 * Check validity of the scope zone ID of the 346 * addresses, and convert it into the kernel 347 * internal form if necessary. 348 */ 349 error = sa6_embedscope(satosin6(src), 0); 350 if (error != 0) 351 goto end; 352 error = sa6_embedscope(satosin6(dst), 0); 353 if (error != 0) 354 goto end; 355 #endif 356 } 357 error = gre_set_tunnel(ifp, src, dst); 358 break; 359 case SIOCDIFPHYADDR: 360 gre_delete_tunnel(ifp); 361 break; 362 case SIOCGIFPSRCADDR: 363 case SIOCGIFPDSTADDR: 364 #ifdef INET6 365 case SIOCGIFPSRCADDR_IN6: 366 case SIOCGIFPDSTADDR_IN6: 367 #endif 368 if (sc->gre_family == 0) { 369 error = EADDRNOTAVAIL; 370 break; 371 } 372 GRE_RLOCK(sc); 373 switch (cmd) { 374 #ifdef INET 375 case SIOCGIFPSRCADDR: 376 case SIOCGIFPDSTADDR: 377 if (sc->gre_family != AF_INET) { 378 error = EADDRNOTAVAIL; 379 break; 380 } 381 sin = (struct sockaddr_in *)&ifr->ifr_addr; 382 memset(sin, 0, sizeof(*sin)); 383 sin->sin_family = AF_INET; 384 sin->sin_len = sizeof(*sin); 385 break; 386 #endif 387 #ifdef INET6 388 case SIOCGIFPSRCADDR_IN6: 389 case SIOCGIFPDSTADDR_IN6: 390 if (sc->gre_family != AF_INET6) { 391 error = EADDRNOTAVAIL; 392 break; 393 } 394 sin6 = (struct sockaddr_in6 *) 395 &(((struct in6_ifreq *)data)->ifr_addr); 396 memset(sin6, 0, sizeof(*sin6)); 397 sin6->sin6_family = AF_INET6; 398 sin6->sin6_len = sizeof(*sin6); 399 break; 400 #endif 401 } 402 if (error == 0) { 403 switch (cmd) { 404 #ifdef INET 405 case SIOCGIFPSRCADDR: 406 sin->sin_addr = sc->gre_oip.ip_src; 407 break; 408 case SIOCGIFPDSTADDR: 409 sin->sin_addr = sc->gre_oip.ip_dst; 410 break; 411 #endif 412 #ifdef INET6 413 case SIOCGIFPSRCADDR_IN6: 414 sin6->sin6_addr = sc->gre_oip6.ip6_src; 415 break; 416 case SIOCGIFPDSTADDR_IN6: 417 sin6->sin6_addr = sc->gre_oip6.ip6_dst; 418 break; 419 #endif 420 } 421 } 422 GRE_RUNLOCK(sc); 423 if (error != 0) 424 break; 425 switch (cmd) { 426 #ifdef INET 427 case SIOCGIFPSRCADDR: 428 case SIOCGIFPDSTADDR: 429 error = prison_if(curthread->td_ucred, 430 (struct sockaddr *)sin); 431 if (error != 0) 432 memset(sin, 0, sizeof(*sin)); 433 break; 434 #endif 435 #ifdef INET6 436 case SIOCGIFPSRCADDR_IN6: 437 case SIOCGIFPDSTADDR_IN6: 438 error = prison_if(curthread->td_ucred, 439 (struct sockaddr *)sin6); 440 if (error == 0) 441 error = sa6_recoverscope(sin6); 442 if (error != 0) 443 memset(sin6, 0, sizeof(*sin6)); 444 #endif 445 } 446 break; 447 case SIOCGTUNFIB: 448 ifr->ifr_fib = sc->gre_fibnum; 449 break; 450 case SIOCSTUNFIB: 451 if ((error = priv_check(curthread, PRIV_NET_GRE)) != 0) 452 break; 453 if (ifr->ifr_fib >= rt_numfibs) 454 error = EINVAL; 455 else 456 sc->gre_fibnum = ifr->ifr_fib; 457 break; 458 case GRESKEY: 459 if ((error = priv_check(curthread, PRIV_NET_GRE)) != 0) 460 break; 461 if ((error = copyin(ifr->ifr_data, &opt, sizeof(opt))) != 0) 462 break; 463 if (sc->gre_key != opt) { 464 GRE_WLOCK(sc); 465 sc->gre_key = opt; 466 gre_updatehdr(sc); 467 GRE_WUNLOCK(sc); 468 } 469 break; 470 case GREGKEY: 471 error = copyout(&sc->gre_key, ifr->ifr_data, 472 sizeof(sc->gre_key)); 473 break; 474 case GRESOPTS: 475 if ((error = priv_check(curthread, PRIV_NET_GRE)) != 0) 476 break; 477 if ((error = copyin(ifr->ifr_data, &opt, sizeof(opt))) != 0) 478 break; 479 if (opt & ~GRE_OPTMASK) 480 error = EINVAL; 481 else { 482 if (sc->gre_options != opt) { 483 GRE_WLOCK(sc); 484 sc->gre_options = opt; 485 gre_updatehdr(sc); 486 GRE_WUNLOCK(sc); 487 } 488 } 489 break; 490 491 case GREGOPTS: 492 error = copyout(&sc->gre_options, ifr->ifr_data, 493 sizeof(sc->gre_options)); 494 break; 495 default: 496 error = EINVAL; 497 break; 498 } 499 end: 500 sx_xunlock(&gre_ioctl_sx); 501 return (error); 502 } 503 504 static void 505 gre_updatehdr(struct gre_softc *sc) 506 { 507 struct grehdr *gh = NULL; 508 uint32_t *opts; 509 uint16_t flags; 510 511 GRE_WLOCK_ASSERT(sc); 512 switch (sc->gre_family) { 513 #ifdef INET 514 case AF_INET: 515 sc->gre_hlen = sizeof(struct greip); 516 sc->gre_oip.ip_v = IPPROTO_IPV4; 517 sc->gre_oip.ip_hl = sizeof(struct ip) >> 2; 518 sc->gre_oip.ip_p = IPPROTO_GRE; 519 gh = &sc->gre_gihdr->gi_gre; 520 break; 521 #endif 522 #ifdef INET6 523 case AF_INET6: 524 sc->gre_hlen = sizeof(struct greip6); 525 sc->gre_oip6.ip6_vfc = IPV6_VERSION; 526 sc->gre_oip6.ip6_nxt = IPPROTO_GRE; 527 gh = &sc->gre_gi6hdr->gi6_gre; 528 break; 529 #endif 530 default: 531 return; 532 } 533 flags = 0; 534 opts = gh->gre_opts; 535 if (sc->gre_options & GRE_ENABLE_CSUM) { 536 flags |= GRE_FLAGS_CP; 537 sc->gre_hlen += 2 * sizeof(uint16_t); 538 *opts++ = 0; 539 } 540 if (sc->gre_key != 0) { 541 flags |= GRE_FLAGS_KP; 542 sc->gre_hlen += sizeof(uint32_t); 543 *opts++ = htonl(sc->gre_key); 544 } 545 if (sc->gre_options & GRE_ENABLE_SEQ) { 546 flags |= GRE_FLAGS_SP; 547 sc->gre_hlen += sizeof(uint32_t); 548 *opts++ = 0; 549 } else 550 sc->gre_oseq = 0; 551 gh->gre_flags = htons(flags); 552 GRE2IFP(sc)->if_mtu = sc->gre_mtu - sc->gre_hlen; 553 } 554 555 static void 556 gre_detach(struct gre_softc *sc) 557 { 558 559 sx_assert(&gre_ioctl_sx, SA_XLOCKED); 560 if (sc->gre_ecookie != NULL) 561 encap_detach(sc->gre_ecookie); 562 sc->gre_ecookie = NULL; 563 } 564 565 static int 566 gre_set_tunnel(struct ifnet *ifp, struct sockaddr *src, 567 struct sockaddr *dst) 568 { 569 struct gre_softc *sc, *tsc; 570 #ifdef INET6 571 struct ip6_hdr *ip6; 572 #endif 573 #ifdef INET 574 struct ip *ip; 575 #endif 576 void *hdr; 577 int error; 578 579 sx_assert(&gre_ioctl_sx, SA_XLOCKED); 580 GRE_LIST_LOCK(); 581 sc = ifp->if_softc; 582 LIST_FOREACH(tsc, &V_gre_softc_list, gre_list) { 583 if (tsc == sc || tsc->gre_family != src->sa_family) 584 continue; 585 #ifdef INET 586 if (tsc->gre_family == AF_INET && 587 tsc->gre_oip.ip_src.s_addr == 588 satosin(src)->sin_addr.s_addr && 589 tsc->gre_oip.ip_dst.s_addr == 590 satosin(dst)->sin_addr.s_addr) { 591 GRE_LIST_UNLOCK(); 592 return (EADDRNOTAVAIL); 593 } 594 #endif 595 #ifdef INET6 596 if (tsc->gre_family == AF_INET6 && 597 IN6_ARE_ADDR_EQUAL(&tsc->gre_oip6.ip6_src, 598 &satosin6(src)->sin6_addr) && 599 IN6_ARE_ADDR_EQUAL(&tsc->gre_oip6.ip6_dst, 600 &satosin6(dst)->sin6_addr)) { 601 GRE_LIST_UNLOCK(); 602 return (EADDRNOTAVAIL); 603 } 604 #endif 605 } 606 GRE_LIST_UNLOCK(); 607 608 switch (src->sa_family) { 609 #ifdef INET 610 case AF_INET: 611 hdr = ip = malloc(sizeof(struct greip) + 612 3 * sizeof(uint32_t), M_GRE, M_WAITOK | M_ZERO); 613 ip->ip_src = satosin(src)->sin_addr; 614 ip->ip_dst = satosin(dst)->sin_addr; 615 break; 616 #endif 617 #ifdef INET6 618 case AF_INET6: 619 hdr = ip6 = malloc(sizeof(struct greip6) + 620 3 * sizeof(uint32_t), M_GRE, M_WAITOK | M_ZERO); 621 ip6->ip6_src = satosin6(src)->sin6_addr; 622 ip6->ip6_dst = satosin6(dst)->sin6_addr; 623 break; 624 #endif 625 default: 626 return (EAFNOSUPPORT); 627 } 628 if (sc->gre_family != 0) 629 gre_detach(sc); 630 GRE_WLOCK(sc); 631 if (sc->gre_family != 0) 632 free(sc->gre_hdr, M_GRE); 633 sc->gre_family = src->sa_family; 634 sc->gre_hdr = hdr; 635 sc->gre_oseq = 0; 636 sc->gre_iseq = UINT32_MAX; 637 gre_updatehdr(sc); 638 GRE_WUNLOCK(sc); 639 640 error = 0; 641 switch (src->sa_family) { 642 #ifdef INET 643 case AF_INET: 644 error = in_gre_attach(sc); 645 break; 646 #endif 647 #ifdef INET6 648 case AF_INET6: 649 error = in6_gre_attach(sc); 650 break; 651 #endif 652 } 653 if (error == 0) { 654 ifp->if_drv_flags |= IFF_DRV_RUNNING; 655 if_link_state_change(ifp, LINK_STATE_UP); 656 } 657 return (error); 658 } 659 660 static void 661 gre_delete_tunnel(struct ifnet *ifp) 662 { 663 struct gre_softc *sc = ifp->if_softc; 664 int family; 665 666 GRE_WLOCK(sc); 667 family = sc->gre_family; 668 sc->gre_family = 0; 669 GRE_WUNLOCK(sc); 670 if (family != 0) { 671 gre_detach(sc); 672 free(sc->gre_hdr, M_GRE); 673 } 674 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 675 if_link_state_change(ifp, LINK_STATE_DOWN); 676 } 677 678 int 679 gre_input(struct mbuf **mp, int *offp, int proto) 680 { 681 struct gre_softc *sc; 682 struct grehdr *gh; 683 struct ifnet *ifp; 684 struct mbuf *m; 685 uint32_t *opts; 686 #ifdef notyet 687 uint32_t key; 688 #endif 689 uint16_t flags; 690 int hlen, isr, af; 691 692 m = *mp; 693 sc = encap_getarg(m); 694 KASSERT(sc != NULL, ("encap_getarg returned NULL")); 695 696 ifp = GRE2IFP(sc); 697 hlen = *offp + sizeof(struct grehdr) + 4 * sizeof(uint32_t); 698 if (m->m_pkthdr.len < hlen) 699 goto drop; 700 if (m->m_len < hlen) { 701 m = m_pullup(m, hlen); 702 if (m == NULL) 703 goto drop; 704 } 705 gh = (struct grehdr *)mtodo(m, *offp); 706 flags = ntohs(gh->gre_flags); 707 if (flags & ~GRE_FLAGS_MASK) 708 goto drop; 709 opts = gh->gre_opts; 710 hlen = 2 * sizeof(uint16_t); 711 if (flags & GRE_FLAGS_CP) { 712 /* reserved1 field must be zero */ 713 if (((uint16_t *)opts)[1] != 0) 714 goto drop; 715 if (in_cksum_skip(m, m->m_pkthdr.len, *offp) != 0) 716 goto drop; 717 hlen += 2 * sizeof(uint16_t); 718 opts++; 719 } 720 if (flags & GRE_FLAGS_KP) { 721 #ifdef notyet 722 /* 723 * XXX: The current implementation uses the key only for outgoing 724 * packets. But we can check the key value here, or even in the 725 * encapcheck function. 726 */ 727 key = ntohl(*opts); 728 #endif 729 hlen += sizeof(uint32_t); 730 opts++; 731 } 732 #ifdef notyet 733 } else 734 key = 0; 735 736 if (sc->gre_key != 0 && (key != sc->gre_key || key != 0)) 737 goto drop; 738 #endif 739 if (flags & GRE_FLAGS_SP) { 740 #ifdef notyet 741 seq = ntohl(*opts); 742 #endif 743 hlen += sizeof(uint32_t); 744 } 745 switch (ntohs(gh->gre_proto)) { 746 case ETHERTYPE_WCCP: 747 /* 748 * For WCCP skip an additional 4 bytes if after GRE header 749 * doesn't follow an IP header. 750 */ 751 if (flags == 0 && (*(uint8_t *)gh->gre_opts & 0xF0) != 0x40) 752 hlen += sizeof(uint32_t); 753 /* FALLTHROUGH */ 754 case ETHERTYPE_IP: 755 isr = NETISR_IP; 756 af = AF_INET; 757 break; 758 case ETHERTYPE_IPV6: 759 isr = NETISR_IPV6; 760 af = AF_INET6; 761 break; 762 default: 763 goto drop; 764 } 765 m_adj(m, *offp + hlen); 766 m_clrprotoflags(m); 767 m->m_pkthdr.rcvif = ifp; 768 M_SETFIB(m, ifp->if_fib); 769 #ifdef MAC 770 mac_ifnet_create_mbuf(ifp, m); 771 #endif 772 BPF_MTAP2(ifp, &af, sizeof(af), m); 773 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 774 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 775 if ((ifp->if_flags & IFF_MONITOR) != 0) 776 m_freem(m); 777 else 778 netisr_dispatch(isr, m); 779 return (IPPROTO_DONE); 780 drop: 781 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1); 782 m_freem(m); 783 return (IPPROTO_DONE); 784 } 785 786 #define MTAG_GRE 1307983903 787 static int 788 gre_check_nesting(struct ifnet *ifp, struct mbuf *m) 789 { 790 struct m_tag *mtag; 791 int count; 792 793 count = 1; 794 mtag = NULL; 795 while ((mtag = m_tag_locate(m, MTAG_GRE, 0, mtag)) != NULL) { 796 if (*(struct ifnet **)(mtag + 1) == ifp) { 797 log(LOG_NOTICE, "%s: loop detected\n", ifp->if_xname); 798 return (EIO); 799 } 800 count++; 801 } 802 if (count > V_max_gre_nesting) { 803 log(LOG_NOTICE, 804 "%s: if_output recursively called too many times(%d)\n", 805 ifp->if_xname, count); 806 return (EIO); 807 } 808 mtag = m_tag_alloc(MTAG_GRE, 0, sizeof(struct ifnet *), M_NOWAIT); 809 if (mtag == NULL) 810 return (ENOMEM); 811 *(struct ifnet **)(mtag + 1) = ifp; 812 m_tag_prepend(m, mtag); 813 return (0); 814 } 815 816 static int 817 gre_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 818 struct route *ro) 819 { 820 uint32_t af; 821 int error; 822 823 #ifdef MAC 824 error = mac_ifnet_check_transmit(ifp, m); 825 if (error != 0) 826 goto drop; 827 #endif 828 if ((ifp->if_flags & IFF_MONITOR) != 0 || 829 (ifp->if_flags & IFF_UP) == 0) { 830 error = ENETDOWN; 831 goto drop; 832 } 833 834 error = gre_check_nesting(ifp, m); 835 if (error != 0) 836 goto drop; 837 838 m->m_flags &= ~(M_BCAST|M_MCAST); 839 if (dst->sa_family == AF_UNSPEC) 840 bcopy(dst->sa_data, &af, sizeof(af)); 841 else 842 af = dst->sa_family; 843 BPF_MTAP2(ifp, &af, sizeof(af), m); 844 m->m_pkthdr.csum_data = af; /* save af for if_transmit */ 845 return (ifp->if_transmit(ifp, m)); 846 drop: 847 m_freem(m); 848 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 849 return (error); 850 } 851 852 static void 853 gre_setseqn(struct grehdr *gh, uint32_t seq) 854 { 855 uint32_t *opts; 856 uint16_t flags; 857 858 opts = gh->gre_opts; 859 flags = ntohs(gh->gre_flags); 860 KASSERT((flags & GRE_FLAGS_SP) != 0, 861 ("gre_setseqn called, but GRE_FLAGS_SP isn't set ")); 862 if (flags & GRE_FLAGS_CP) 863 opts++; 864 if (flags & GRE_FLAGS_KP) 865 opts++; 866 *opts = htonl(seq); 867 } 868 869 static int 870 gre_transmit(struct ifnet *ifp, struct mbuf *m) 871 { 872 GRE_RLOCK_TRACKER; 873 struct gre_softc *sc; 874 struct grehdr *gh; 875 uint32_t iaf, oaf, oseq; 876 int error, hlen, olen, plen; 877 int want_seq, want_csum; 878 879 plen = 0; 880 sc = ifp->if_softc; 881 if (sc == NULL) { 882 error = ENETDOWN; 883 m_freem(m); 884 goto drop; 885 } 886 GRE_RLOCK(sc); 887 if (sc->gre_family == 0) { 888 GRE_RUNLOCK(sc); 889 error = ENETDOWN; 890 m_freem(m); 891 goto drop; 892 } 893 iaf = m->m_pkthdr.csum_data; 894 oaf = sc->gre_family; 895 hlen = sc->gre_hlen; 896 want_seq = (sc->gre_options & GRE_ENABLE_SEQ) != 0; 897 if (want_seq) 898 oseq = sc->gre_oseq++; /* XXX */ 899 else 900 oseq = 0; /* Make compiler happy. */ 901 want_csum = (sc->gre_options & GRE_ENABLE_CSUM) != 0; 902 M_SETFIB(m, sc->gre_fibnum); 903 M_PREPEND(m, hlen, M_NOWAIT); 904 if (m == NULL) { 905 GRE_RUNLOCK(sc); 906 error = ENOBUFS; 907 goto drop; 908 } 909 bcopy(sc->gre_hdr, mtod(m, void *), hlen); 910 GRE_RUNLOCK(sc); 911 switch (oaf) { 912 #ifdef INET 913 case AF_INET: 914 olen = sizeof(struct ip); 915 break; 916 #endif 917 #ifdef INET6 918 case AF_INET6: 919 olen = sizeof(struct ip6_hdr); 920 break; 921 #endif 922 default: 923 error = ENETDOWN; 924 goto drop; 925 } 926 gh = (struct grehdr *)mtodo(m, olen); 927 switch (iaf) { 928 #ifdef INET 929 case AF_INET: 930 gh->gre_proto = htons(ETHERTYPE_IP); 931 break; 932 #endif 933 #ifdef INET6 934 case AF_INET6: 935 gh->gre_proto = htons(ETHERTYPE_IPV6); 936 break; 937 #endif 938 default: 939 error = ENETDOWN; 940 goto drop; 941 } 942 if (want_seq) 943 gre_setseqn(gh, oseq); 944 if (want_csum) { 945 *(uint16_t *)gh->gre_opts = in_cksum_skip(m, 946 m->m_pkthdr.len, olen); 947 } 948 plen = m->m_pkthdr.len - hlen; 949 switch (oaf) { 950 #ifdef INET 951 case AF_INET: 952 error = in_gre_output(m, iaf, hlen); 953 break; 954 #endif 955 #ifdef INET6 956 case AF_INET6: 957 error = in6_gre_output(m, iaf, hlen); 958 break; 959 #endif 960 default: 961 m_freem(m); 962 error = ENETDOWN; 963 } 964 drop: 965 if (error) 966 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 967 else { 968 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); 969 if_inc_counter(ifp, IFCOUNTER_OBYTES, plen); 970 } 971 return (error); 972 } 973 974 static void 975 gre_qflush(struct ifnet *ifp __unused) 976 { 977 978 } 979 980 static int 981 gremodevent(module_t mod, int type, void *data) 982 { 983 984 switch (type) { 985 case MOD_LOAD: 986 case MOD_UNLOAD: 987 break; 988 default: 989 return (EOPNOTSUPP); 990 } 991 return (0); 992 } 993 994 static moduledata_t gre_mod = { 995 "if_gre", 996 gremodevent, 997 0 998 }; 999 1000 DECLARE_MODULE(if_gre, gre_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 1001 MODULE_VERSION(if_gre, 1);
Cache object: c7a2ad1010395e1bbdef320b2c0d9c6f
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