Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/net/if_stf.c
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1 /* $FreeBSD$ */ 2 /* $KAME: if_stf.c,v 1.73 2001/12/03 11:08:30 keiichi Exp $ */ 3 4 /*- 5 * SPDX-License-Identifier: BSD-3-Clause 6 * 7 * Copyright (C) 2000 WIDE Project. 8 * All rights reserved. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the project nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 /* 36 * 6to4 interface, based on RFC3056. 37 * 38 * 6to4 interface is NOT capable of link-layer (I mean, IPv4) multicasting. 39 * There is no address mapping defined from IPv6 multicast address to IPv4 40 * address. Therefore, we do not have IFF_MULTICAST on the interface. 41 * 42 * Due to the lack of address mapping for link-local addresses, we cannot 43 * throw packets toward link-local addresses (fe80::x). Also, we cannot throw 44 * packets to link-local multicast addresses (ff02::x). 45 * 46 * Here are interesting symptoms due to the lack of link-local address: 47 * 48 * Unicast routing exchange: 49 * - RIPng: Impossible. Uses link-local multicast packet toward ff02::9, 50 * and link-local addresses as nexthop. 51 * - OSPFv6: Impossible. OSPFv6 assumes that there's link-local address 52 * assigned to the link, and makes use of them. Also, HELLO packets use 53 * link-local multicast addresses (ff02::5 and ff02::6). 54 * - BGP4+: Maybe. You can only use global address as nexthop, and global 55 * address as TCP endpoint address. 56 * 57 * Multicast routing protocols: 58 * - PIM: Hello packet cannot be used to discover adjacent PIM routers. 59 * Adjacent PIM routers must be configured manually (is it really spec-wise 60 * correct thing to do?). 61 * 62 * ICMPv6: 63 * - Redirects cannot be used due to the lack of link-local address. 64 * 65 * stf interface does not have, and will not need, a link-local address. 66 * It seems to have no real benefit and does not help the above symptoms much. 67 * Even if we assign link-locals to interface, we cannot really 68 * use link-local unicast/multicast on top of 6to4 cloud (since there's no 69 * encapsulation defined for link-local address), and the above analysis does 70 * not change. RFC3056 does not mandate the assignment of link-local address 71 * either. 72 * 73 * 6to4 interface has security issues. Refer to 74 * http://playground.iijlab.net/i-d/draft-itojun-ipv6-transition-abuse-00.txt 75 * for details. The code tries to filter out some of malicious packets. 76 * Note that there is no way to be 100% secure. 77 */ 78 79 #include <sys/param.h> 80 #include <sys/systm.h> 81 #include <sys/socket.h> 82 #include <sys/sockio.h> 83 #include <sys/mbuf.h> 84 #include <sys/errno.h> 85 #include <sys/kernel.h> 86 #include <sys/lock.h> 87 #include <sys/module.h> 88 #include <sys/proc.h> 89 #include <sys/queue.h> 90 #include <sys/rmlock.h> 91 #include <sys/sysctl.h> 92 #include <machine/cpu.h> 93 94 #include <sys/malloc.h> 95 96 #include <net/if.h> 97 #include <net/if_var.h> 98 #include <net/if_clone.h> 99 #include <net/route.h> 100 #include <net/netisr.h> 101 #include <net/if_types.h> 102 #include <net/vnet.h> 103 104 #include <netinet/in.h> 105 #include <netinet/in_fib.h> 106 #include <netinet/in_systm.h> 107 #include <netinet/ip.h> 108 #include <netinet/ip_var.h> 109 #include <netinet/in_var.h> 110 111 #include <netinet/ip6.h> 112 #include <netinet6/ip6_var.h> 113 #include <netinet6/in6_var.h> 114 #include <netinet/ip_ecn.h> 115 116 #include <netinet/ip_encap.h> 117 118 #include <machine/stdarg.h> 119 120 #include <net/bpf.h> 121 122 #include <security/mac/mac_framework.h> 123 124 SYSCTL_DECL(_net_link); 125 static SYSCTL_NODE(_net_link, IFT_STF, stf, CTLFLAG_RW, 0, "6to4 Interface"); 126 127 static int stf_permit_rfc1918 = 0; 128 SYSCTL_INT(_net_link_stf, OID_AUTO, permit_rfc1918, CTLFLAG_RWTUN, 129 &stf_permit_rfc1918, 0, "Permit the use of private IPv4 addresses"); 130 131 #define STFUNIT 0 132 133 #define IN6_IS_ADDR_6TO4(x) (ntohs((x)->s6_addr16[0]) == 0x2002) 134 135 /* 136 * XXX: Return a pointer with 16-bit aligned. Don't cast it to 137 * struct in_addr *; use bcopy() instead. 138 */ 139 #define GET_V4(x) (&(x)->s6_addr16[1]) 140 141 struct stf_softc { 142 struct ifnet *sc_ifp; 143 u_int sc_fibnum; 144 const struct encaptab *encap_cookie; 145 }; 146 #define STF2IFP(sc) ((sc)->sc_ifp) 147 148 static const char stfname[] = "stf"; 149 150 static MALLOC_DEFINE(M_STF, stfname, "6to4 Tunnel Interface"); 151 static const int ip_stf_ttl = 40; 152 153 static int in_stf_input(struct mbuf *, int, int, void *); 154 static char *stfnames[] = {"stf0", "stf", "6to4", NULL}; 155 156 static int stfmodevent(module_t, int, void *); 157 static int stf_encapcheck(const struct mbuf *, int, int, void *); 158 static int stf_getsrcifa6(struct ifnet *, struct in6_addr *, struct in6_addr *); 159 static int stf_output(struct ifnet *, struct mbuf *, const struct sockaddr *, 160 struct route *); 161 static int isrfc1918addr(struct in_addr *); 162 static int stf_checkaddr4(struct stf_softc *, struct in_addr *, 163 struct ifnet *); 164 static int stf_checkaddr6(struct stf_softc *, struct in6_addr *, 165 struct ifnet *); 166 static int stf_ioctl(struct ifnet *, u_long, caddr_t); 167 168 static int stf_clone_match(struct if_clone *, const char *); 169 static int stf_clone_create(struct if_clone *, char *, size_t, caddr_t); 170 static int stf_clone_destroy(struct if_clone *, struct ifnet *); 171 VNET_DEFINE_STATIC(struct if_clone *, stf_cloner); 172 #define V_stf_cloner VNET(stf_cloner) 173 174 static const struct encap_config ipv4_encap_cfg = { 175 .proto = IPPROTO_IPV6, 176 .min_length = sizeof(struct ip), 177 .exact_match = (sizeof(in_addr_t) << 3) + 8, 178 .check = stf_encapcheck, 179 .input = in_stf_input 180 }; 181 182 static int 183 stf_clone_match(struct if_clone *ifc, const char *name) 184 { 185 int i; 186 187 for(i = 0; stfnames[i] != NULL; i++) { 188 if (strcmp(stfnames[i], name) == 0) 189 return (1); 190 } 191 192 return (0); 193 } 194 195 static int 196 stf_clone_create(struct if_clone *ifc, char *name, size_t len, caddr_t params) 197 { 198 char *dp; 199 int err, unit, wildcard; 200 struct stf_softc *sc; 201 struct ifnet *ifp; 202 203 err = ifc_name2unit(name, &unit); 204 if (err != 0) 205 return (err); 206 wildcard = (unit < 0); 207 208 /* 209 * We can only have one unit, but since unit allocation is 210 * already locked, we use it to keep from allocating extra 211 * interfaces. 212 */ 213 unit = STFUNIT; 214 err = ifc_alloc_unit(ifc, &unit); 215 if (err != 0) 216 return (err); 217 218 sc = malloc(sizeof(struct stf_softc), M_STF, M_WAITOK | M_ZERO); 219 ifp = STF2IFP(sc) = if_alloc(IFT_STF); 220 if (ifp == NULL) { 221 free(sc, M_STF); 222 ifc_free_unit(ifc, unit); 223 return (ENOSPC); 224 } 225 ifp->if_softc = sc; 226 sc->sc_fibnum = curthread->td_proc->p_fibnum; 227 228 /* 229 * Set the name manually rather then using if_initname because 230 * we don't conform to the default naming convention for interfaces. 231 * In the wildcard case, we need to update the name. 232 */ 233 if (wildcard) { 234 for (dp = name; *dp != '\0'; dp++); 235 if (snprintf(dp, len - (dp-name), "%d", unit) > 236 len - (dp-name) - 1) { 237 /* 238 * This can only be a programmer error and 239 * there's no straightforward way to recover if 240 * it happens. 241 */ 242 panic("if_clone_create(): interface name too long"); 243 } 244 } 245 strlcpy(ifp->if_xname, name, IFNAMSIZ); 246 ifp->if_dname = stfname; 247 ifp->if_dunit = IF_DUNIT_NONE; 248 249 sc->encap_cookie = ip_encap_attach(&ipv4_encap_cfg, sc, M_WAITOK); 250 if (sc->encap_cookie == NULL) { 251 if_printf(ifp, "attach failed\n"); 252 free(sc, M_STF); 253 ifc_free_unit(ifc, unit); 254 return (ENOMEM); 255 } 256 257 ifp->if_mtu = IPV6_MMTU; 258 ifp->if_ioctl = stf_ioctl; 259 ifp->if_output = stf_output; 260 ifp->if_snd.ifq_maxlen = ifqmaxlen; 261 if_attach(ifp); 262 bpfattach(ifp, DLT_NULL, sizeof(u_int32_t)); 263 return (0); 264 } 265 266 static int 267 stf_clone_destroy(struct if_clone *ifc, struct ifnet *ifp) 268 { 269 struct stf_softc *sc = ifp->if_softc; 270 int err __unused; 271 272 err = ip_encap_detach(sc->encap_cookie); 273 KASSERT(err == 0, ("Unexpected error detaching encap_cookie")); 274 bpfdetach(ifp); 275 if_detach(ifp); 276 if_free(ifp); 277 278 free(sc, M_STF); 279 ifc_free_unit(ifc, STFUNIT); 280 281 return (0); 282 } 283 284 static void 285 vnet_stf_init(const void *unused __unused) 286 { 287 V_stf_cloner = if_clone_advanced(stfname, 0, stf_clone_match, 288 stf_clone_create, stf_clone_destroy); 289 } 290 VNET_SYSINIT(vnet_stf_init, SI_SUB_PSEUDO, SI_ORDER_ANY, vnet_stf_init, NULL); 291 292 static void 293 vnet_stf_uninit(const void *unused __unused) 294 { 295 if_clone_detach(V_stf_cloner); 296 V_stf_cloner = NULL; 297 } 298 VNET_SYSUNINIT(vnet_stf_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY, vnet_stf_uninit, 299 NULL); 300 301 static int 302 stfmodevent(module_t mod, int type, void *data) 303 { 304 305 switch (type) { 306 case MOD_LOAD: 307 /* Done in vnet_stf_init() */ 308 break; 309 case MOD_UNLOAD: 310 /* Done in vnet_stf_uninit() */ 311 break; 312 default: 313 return (EOPNOTSUPP); 314 } 315 316 return (0); 317 } 318 319 static moduledata_t stf_mod = { 320 "if_stf", 321 stfmodevent, 322 0 323 }; 324 325 DECLARE_MODULE(if_stf, stf_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 326 327 static int 328 stf_encapcheck(const struct mbuf *m, int off, int proto, void *arg) 329 { 330 struct ip ip; 331 struct stf_softc *sc; 332 struct in_addr a, b, mask; 333 struct in6_addr addr6, mask6; 334 335 sc = (struct stf_softc *)arg; 336 if (sc == NULL) 337 return (0); 338 339 if ((STF2IFP(sc)->if_flags & IFF_UP) == 0) 340 return (0); 341 342 /* IFF_LINK0 means "no decapsulation" */ 343 if ((STF2IFP(sc)->if_flags & IFF_LINK0) != 0) 344 return (0); 345 346 if (proto != IPPROTO_IPV6) 347 return (0); 348 349 m_copydata(m, 0, sizeof(ip), (caddr_t)&ip); 350 351 if (ip.ip_v != 4) 352 return (0); 353 354 if (stf_getsrcifa6(STF2IFP(sc), &addr6, &mask6) != 0) 355 return (0); 356 357 /* 358 * check if IPv4 dst matches the IPv4 address derived from the 359 * local 6to4 address. 360 * success on: dst = 10.1.1.1, ia6->ia_addr = 2002:0a01:0101:... 361 */ 362 if (bcmp(GET_V4(&addr6), &ip.ip_dst, sizeof(ip.ip_dst)) != 0) 363 return (0); 364 365 /* 366 * check if IPv4 src matches the IPv4 address derived from the 367 * local 6to4 address masked by prefixmask. 368 * success on: src = 10.1.1.1, ia6->ia_addr = 2002:0a00:.../24 369 * fail on: src = 10.1.1.1, ia6->ia_addr = 2002:0b00:.../24 370 */ 371 bzero(&a, sizeof(a)); 372 bcopy(GET_V4(&addr6), &a, sizeof(a)); 373 bcopy(GET_V4(&mask6), &mask, sizeof(mask)); 374 a.s_addr &= mask.s_addr; 375 b = ip.ip_src; 376 b.s_addr &= mask.s_addr; 377 if (a.s_addr != b.s_addr) 378 return (0); 379 380 /* stf interface makes single side match only */ 381 return (32); 382 } 383 384 static int 385 stf_getsrcifa6(struct ifnet *ifp, struct in6_addr *addr, struct in6_addr *mask) 386 { 387 struct rm_priotracker in_ifa_tracker; 388 struct ifaddr *ia; 389 struct in_ifaddr *ia4; 390 struct in6_ifaddr *ia6; 391 struct sockaddr_in6 *sin6; 392 struct in_addr in; 393 394 if_addr_rlock(ifp); 395 CK_STAILQ_FOREACH(ia, &ifp->if_addrhead, ifa_link) { 396 if (ia->ifa_addr->sa_family != AF_INET6) 397 continue; 398 sin6 = (struct sockaddr_in6 *)ia->ifa_addr; 399 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) 400 continue; 401 402 bcopy(GET_V4(&sin6->sin6_addr), &in, sizeof(in)); 403 IN_IFADDR_RLOCK(&in_ifa_tracker); 404 LIST_FOREACH(ia4, INADDR_HASH(in.s_addr), ia_hash) 405 if (ia4->ia_addr.sin_addr.s_addr == in.s_addr) 406 break; 407 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 408 if (ia4 == NULL) 409 continue; 410 411 ia6 = (struct in6_ifaddr *)ia; 412 413 *addr = sin6->sin6_addr; 414 *mask = ia6->ia_prefixmask.sin6_addr; 415 if_addr_runlock(ifp); 416 return (0); 417 } 418 if_addr_runlock(ifp); 419 420 return (ENOENT); 421 } 422 423 static int 424 stf_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 425 struct route *ro) 426 { 427 struct stf_softc *sc; 428 const struct sockaddr_in6 *dst6; 429 struct in_addr in4; 430 const void *ptr; 431 u_int8_t tos; 432 struct ip *ip; 433 struct ip6_hdr *ip6; 434 struct in6_addr addr6, mask6; 435 int error; 436 437 #ifdef MAC 438 error = mac_ifnet_check_transmit(ifp, m); 439 if (error) { 440 m_freem(m); 441 return (error); 442 } 443 #endif 444 445 sc = ifp->if_softc; 446 dst6 = (const struct sockaddr_in6 *)dst; 447 448 /* just in case */ 449 if ((ifp->if_flags & IFF_UP) == 0) { 450 m_freem(m); 451 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 452 return (ENETDOWN); 453 } 454 455 /* 456 * If we don't have an ip4 address that match my inner ip6 address, 457 * we shouldn't generate output. Without this check, we'll end up 458 * using wrong IPv4 source. 459 */ 460 if (stf_getsrcifa6(ifp, &addr6, &mask6) != 0) { 461 m_freem(m); 462 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 463 return (ENETDOWN); 464 } 465 466 if (m->m_len < sizeof(*ip6)) { 467 m = m_pullup(m, sizeof(*ip6)); 468 if (!m) { 469 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 470 return (ENOBUFS); 471 } 472 } 473 ip6 = mtod(m, struct ip6_hdr *); 474 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 475 476 /* 477 * Pickup the right outer dst addr from the list of candidates. 478 * ip6_dst has priority as it may be able to give us shorter IPv4 hops. 479 */ 480 ptr = NULL; 481 if (IN6_IS_ADDR_6TO4(&ip6->ip6_dst)) 482 ptr = GET_V4(&ip6->ip6_dst); 483 else if (IN6_IS_ADDR_6TO4(&dst6->sin6_addr)) 484 ptr = GET_V4(&dst6->sin6_addr); 485 else { 486 m_freem(m); 487 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 488 return (ENETUNREACH); 489 } 490 bcopy(ptr, &in4, sizeof(in4)); 491 492 if (bpf_peers_present(ifp->if_bpf)) { 493 /* 494 * We need to prepend the address family as 495 * a four byte field. Cons up a dummy header 496 * to pacify bpf. This is safe because bpf 497 * will only read from the mbuf (i.e., it won't 498 * try to free it or keep a pointer a to it). 499 */ 500 u_int af = AF_INET6; 501 bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m); 502 } 503 504 M_PREPEND(m, sizeof(struct ip), M_NOWAIT); 505 if (m == NULL) { 506 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 507 return (ENOBUFS); 508 } 509 ip = mtod(m, struct ip *); 510 511 bzero(ip, sizeof(*ip)); 512 513 bcopy(GET_V4(&addr6), &ip->ip_src, sizeof(ip->ip_src)); 514 bcopy(&in4, &ip->ip_dst, sizeof(ip->ip_dst)); 515 ip->ip_p = IPPROTO_IPV6; 516 ip->ip_ttl = ip_stf_ttl; 517 ip->ip_len = htons(m->m_pkthdr.len); 518 if (ifp->if_flags & IFF_LINK1) 519 ip_ecn_ingress(ECN_ALLOWED, &ip->ip_tos, &tos); 520 else 521 ip_ecn_ingress(ECN_NOCARE, &ip->ip_tos, &tos); 522 523 M_SETFIB(m, sc->sc_fibnum); 524 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); 525 error = ip_output(m, NULL, NULL, 0, NULL, NULL); 526 527 return (error); 528 } 529 530 static int 531 isrfc1918addr(struct in_addr *in) 532 { 533 /* 534 * returns 1 if private address range: 535 * 10.0.0.0/8 172.16.0.0/12 192.168.0.0/16 536 */ 537 if (stf_permit_rfc1918 == 0 && ( 538 (ntohl(in->s_addr) & 0xff000000) >> 24 == 10 || 539 (ntohl(in->s_addr) & 0xfff00000) >> 16 == 172 * 256 + 16 || 540 (ntohl(in->s_addr) & 0xffff0000) >> 16 == 192 * 256 + 168)) 541 return (1); 542 543 return (0); 544 } 545 546 static int 547 stf_checkaddr4(struct stf_softc *sc, struct in_addr *in, struct ifnet *inifp) 548 { 549 struct rm_priotracker in_ifa_tracker; 550 struct in_ifaddr *ia4; 551 552 /* 553 * reject packets with the following address: 554 * 224.0.0.0/4 0.0.0.0/8 127.0.0.0/8 255.0.0.0/8 555 */ 556 if (IN_MULTICAST(ntohl(in->s_addr))) 557 return (-1); 558 switch ((ntohl(in->s_addr) & 0xff000000) >> 24) { 559 case 0: case 127: case 255: 560 return (-1); 561 } 562 563 /* 564 * reject packets with private address range. 565 * (requirement from RFC3056 section 2 1st paragraph) 566 */ 567 if (isrfc1918addr(in)) 568 return (-1); 569 570 /* 571 * reject packets with broadcast 572 */ 573 IN_IFADDR_RLOCK(&in_ifa_tracker); 574 CK_STAILQ_FOREACH(ia4, &V_in_ifaddrhead, ia_link) { 575 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0) 576 continue; 577 if (in->s_addr == ia4->ia_broadaddr.sin_addr.s_addr) { 578 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 579 return (-1); 580 } 581 } 582 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 583 584 /* 585 * perform ingress filter 586 */ 587 if (sc && (STF2IFP(sc)->if_flags & IFF_LINK2) == 0 && inifp) { 588 struct nhop4_basic nh4; 589 590 if (fib4_lookup_nh_basic(sc->sc_fibnum, *in, 0, 0, &nh4) != 0) 591 return (-1); 592 593 if (nh4.nh_ifp != inifp) 594 return (-1); 595 } 596 597 return (0); 598 } 599 600 static int 601 stf_checkaddr6(struct stf_softc *sc, struct in6_addr *in6, struct ifnet *inifp) 602 { 603 /* 604 * check 6to4 addresses 605 */ 606 if (IN6_IS_ADDR_6TO4(in6)) { 607 struct in_addr in4; 608 bcopy(GET_V4(in6), &in4, sizeof(in4)); 609 return (stf_checkaddr4(sc, &in4, inifp)); 610 } 611 612 /* 613 * reject anything that look suspicious. the test is implemented 614 * in ip6_input too, but we check here as well to 615 * (1) reject bad packets earlier, and 616 * (2) to be safe against future ip6_input change. 617 */ 618 if (IN6_IS_ADDR_V4COMPAT(in6) || IN6_IS_ADDR_V4MAPPED(in6)) 619 return (-1); 620 621 return (0); 622 } 623 624 static int 625 in_stf_input(struct mbuf *m, int off, int proto, void *arg) 626 { 627 struct stf_softc *sc = arg; 628 struct ip *ip; 629 struct ip6_hdr *ip6; 630 u_int8_t otos, itos; 631 struct ifnet *ifp; 632 633 if (proto != IPPROTO_IPV6) { 634 m_freem(m); 635 return (IPPROTO_DONE); 636 } 637 638 ip = mtod(m, struct ip *); 639 if (sc == NULL || (STF2IFP(sc)->if_flags & IFF_UP) == 0) { 640 m_freem(m); 641 return (IPPROTO_DONE); 642 } 643 644 ifp = STF2IFP(sc); 645 646 #ifdef MAC 647 mac_ifnet_create_mbuf(ifp, m); 648 #endif 649 650 /* 651 * perform sanity check against outer src/dst. 652 * for source, perform ingress filter as well. 653 */ 654 if (stf_checkaddr4(sc, &ip->ip_dst, NULL) < 0 || 655 stf_checkaddr4(sc, &ip->ip_src, m->m_pkthdr.rcvif) < 0) { 656 m_freem(m); 657 return (IPPROTO_DONE); 658 } 659 660 otos = ip->ip_tos; 661 m_adj(m, off); 662 663 if (m->m_len < sizeof(*ip6)) { 664 m = m_pullup(m, sizeof(*ip6)); 665 if (!m) 666 return (IPPROTO_DONE); 667 } 668 ip6 = mtod(m, struct ip6_hdr *); 669 670 /* 671 * perform sanity check against inner src/dst. 672 * for source, perform ingress filter as well. 673 */ 674 if (stf_checkaddr6(sc, &ip6->ip6_dst, NULL) < 0 || 675 stf_checkaddr6(sc, &ip6->ip6_src, m->m_pkthdr.rcvif) < 0) { 676 m_freem(m); 677 return (IPPROTO_DONE); 678 } 679 680 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 681 if ((ifp->if_flags & IFF_LINK1) != 0) 682 ip_ecn_egress(ECN_ALLOWED, &otos, &itos); 683 else 684 ip_ecn_egress(ECN_NOCARE, &otos, &itos); 685 ip6->ip6_flow &= ~htonl(0xff << 20); 686 ip6->ip6_flow |= htonl((u_int32_t)itos << 20); 687 688 m->m_pkthdr.rcvif = ifp; 689 690 if (bpf_peers_present(ifp->if_bpf)) { 691 /* 692 * We need to prepend the address family as 693 * a four byte field. Cons up a dummy header 694 * to pacify bpf. This is safe because bpf 695 * will only read from the mbuf (i.e., it won't 696 * try to free it or keep a pointer a to it). 697 */ 698 u_int32_t af = AF_INET6; 699 bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m); 700 } 701 702 /* 703 * Put the packet to the network layer input queue according to the 704 * specified address family. 705 * See net/if_gif.c for possible issues with packet processing 706 * reorder due to extra queueing. 707 */ 708 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 709 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 710 M_SETFIB(m, ifp->if_fib); 711 netisr_dispatch(NETISR_IPV6, m); 712 return (IPPROTO_DONE); 713 } 714 715 static int 716 stf_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 717 { 718 struct ifaddr *ifa; 719 struct ifreq *ifr; 720 struct sockaddr_in6 *sin6; 721 struct in_addr addr; 722 int error, mtu; 723 724 error = 0; 725 switch (cmd) { 726 case SIOCSIFADDR: 727 ifa = (struct ifaddr *)data; 728 if (ifa == NULL || ifa->ifa_addr->sa_family != AF_INET6) { 729 error = EAFNOSUPPORT; 730 break; 731 } 732 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 733 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) { 734 error = EINVAL; 735 break; 736 } 737 bcopy(GET_V4(&sin6->sin6_addr), &addr, sizeof(addr)); 738 if (isrfc1918addr(&addr)) { 739 error = EINVAL; 740 break; 741 } 742 743 ifp->if_flags |= IFF_UP; 744 ifp->if_drv_flags |= IFF_DRV_RUNNING; 745 break; 746 747 case SIOCADDMULTI: 748 case SIOCDELMULTI: 749 ifr = (struct ifreq *)data; 750 if (ifr && ifr->ifr_addr.sa_family == AF_INET6) 751 ; 752 else 753 error = EAFNOSUPPORT; 754 break; 755 756 case SIOCGIFMTU: 757 break; 758 759 case SIOCSIFMTU: 760 ifr = (struct ifreq *)data; 761 mtu = ifr->ifr_mtu; 762 /* RFC 4213 3.2 ideal world MTU */ 763 if (mtu < IPV6_MINMTU || mtu > IF_MAXMTU - 20) 764 return (EINVAL); 765 ifp->if_mtu = mtu; 766 break; 767 768 default: 769 error = EINVAL; 770 break; 771 } 772 773 return (error); 774 }
Cache object: 6ddddfb578ef190c42099eff6bd1d182
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