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 | CTLFLAG_MPSAFE, 0, 126 "6to4 Interface"); 127 128 static int stf_permit_rfc1918 = 0; 129 SYSCTL_INT(_net_link_stf, OID_AUTO, permit_rfc1918, CTLFLAG_RWTUN, 130 &stf_permit_rfc1918, 0, "Permit the use of private IPv4 addresses"); 131 132 #define STFUNIT 0 133 134 #define IN6_IS_ADDR_6TO4(x) (ntohs((x)->s6_addr16[0]) == 0x2002) 135 136 /* 137 * XXX: Return a pointer with 16-bit aligned. Don't cast it to 138 * struct in_addr *; use bcopy() instead. 139 */ 140 #define GET_V4(x) (&(x)->s6_addr16[1]) 141 142 struct stf_softc { 143 struct ifnet *sc_ifp; 144 u_int sc_fibnum; 145 const struct encaptab *encap_cookie; 146 }; 147 #define STF2IFP(sc) ((sc)->sc_ifp) 148 149 static const char stfname[] = "stf"; 150 151 static MALLOC_DEFINE(M_STF, stfname, "6to4 Tunnel Interface"); 152 static const int ip_stf_ttl = 40; 153 154 static int in_stf_input(struct mbuf *, int, int, void *); 155 static char *stfnames[] = {"stf0", "stf", "6to4", NULL}; 156 157 static int stfmodevent(module_t, int, void *); 158 static int stf_encapcheck(const struct mbuf *, int, int, void *); 159 static int stf_getsrcifa6(struct ifnet *, struct in6_addr *, struct in6_addr *); 160 static int stf_output(struct ifnet *, struct mbuf *, const struct sockaddr *, 161 struct route *); 162 static int isrfc1918addr(struct in_addr *); 163 static int stf_checkaddr4(struct stf_softc *, struct in_addr *, 164 struct ifnet *); 165 static int stf_checkaddr6(struct stf_softc *, struct in6_addr *, 166 struct ifnet *); 167 static int stf_ioctl(struct ifnet *, u_long, caddr_t); 168 169 static int stf_clone_match(struct if_clone *, const char *); 170 static int stf_clone_create(struct if_clone *, char *, size_t, caddr_t); 171 static int stf_clone_destroy(struct if_clone *, struct ifnet *); 172 static struct if_clone *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 int 285 stfmodevent(module_t mod, int type, void *data) 286 { 287 288 switch (type) { 289 case MOD_LOAD: 290 stf_cloner = if_clone_advanced(stfname, 0, stf_clone_match, 291 stf_clone_create, stf_clone_destroy); 292 break; 293 case MOD_UNLOAD: 294 if_clone_detach(stf_cloner); 295 break; 296 default: 297 return (EOPNOTSUPP); 298 } 299 300 return (0); 301 } 302 303 static moduledata_t stf_mod = { 304 "if_stf", 305 stfmodevent, 306 0 307 }; 308 309 DECLARE_MODULE(if_stf, stf_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 310 311 static int 312 stf_encapcheck(const struct mbuf *m, int off, int proto, void *arg) 313 { 314 struct ip ip; 315 struct stf_softc *sc; 316 struct in_addr a, b, mask; 317 struct in6_addr addr6, mask6; 318 319 sc = (struct stf_softc *)arg; 320 if (sc == NULL) 321 return 0; 322 323 if ((STF2IFP(sc)->if_flags & IFF_UP) == 0) 324 return 0; 325 326 /* IFF_LINK0 means "no decapsulation" */ 327 if ((STF2IFP(sc)->if_flags & IFF_LINK0) != 0) 328 return 0; 329 330 if (proto != IPPROTO_IPV6) 331 return 0; 332 333 m_copydata(m, 0, sizeof(ip), (caddr_t)&ip); 334 335 if (ip.ip_v != 4) 336 return 0; 337 338 if (stf_getsrcifa6(STF2IFP(sc), &addr6, &mask6) != 0) 339 return (0); 340 341 /* 342 * check if IPv4 dst matches the IPv4 address derived from the 343 * local 6to4 address. 344 * success on: dst = 10.1.1.1, ia6->ia_addr = 2002:0a01:0101:... 345 */ 346 if (bcmp(GET_V4(&addr6), &ip.ip_dst, sizeof(ip.ip_dst)) != 0) 347 return 0; 348 349 /* 350 * check if IPv4 src matches the IPv4 address derived from the 351 * local 6to4 address masked by prefixmask. 352 * success on: src = 10.1.1.1, ia6->ia_addr = 2002:0a00:.../24 353 * fail on: src = 10.1.1.1, ia6->ia_addr = 2002:0b00:.../24 354 */ 355 bzero(&a, sizeof(a)); 356 bcopy(GET_V4(&addr6), &a, sizeof(a)); 357 bcopy(GET_V4(&mask6), &mask, sizeof(mask)); 358 a.s_addr &= mask.s_addr; 359 b = ip.ip_src; 360 b.s_addr &= mask.s_addr; 361 if (a.s_addr != b.s_addr) 362 return 0; 363 364 /* stf interface makes single side match only */ 365 return 32; 366 } 367 368 static int 369 stf_getsrcifa6(struct ifnet *ifp, struct in6_addr *addr, struct in6_addr *mask) 370 { 371 struct rm_priotracker in_ifa_tracker; 372 struct ifaddr *ia; 373 struct in_ifaddr *ia4; 374 struct in6_ifaddr *ia6; 375 struct sockaddr_in6 *sin6; 376 struct in_addr in; 377 378 NET_EPOCH_ASSERT(); 379 380 CK_STAILQ_FOREACH(ia, &ifp->if_addrhead, ifa_link) { 381 if (ia->ifa_addr->sa_family != AF_INET6) 382 continue; 383 sin6 = (struct sockaddr_in6 *)ia->ifa_addr; 384 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) 385 continue; 386 387 bcopy(GET_V4(&sin6->sin6_addr), &in, sizeof(in)); 388 IN_IFADDR_RLOCK(&in_ifa_tracker); 389 LIST_FOREACH(ia4, INADDR_HASH(in.s_addr), ia_hash) 390 if (ia4->ia_addr.sin_addr.s_addr == in.s_addr) 391 break; 392 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 393 if (ia4 == NULL) 394 continue; 395 396 ia6 = (struct in6_ifaddr *)ia; 397 398 *addr = sin6->sin6_addr; 399 *mask = ia6->ia_prefixmask.sin6_addr; 400 return (0); 401 } 402 403 return (ENOENT); 404 } 405 406 static int 407 stf_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 408 struct route *ro) 409 { 410 struct stf_softc *sc; 411 const struct sockaddr_in6 *dst6; 412 struct in_addr in4; 413 const void *ptr; 414 u_int8_t tos; 415 struct ip *ip; 416 struct ip6_hdr *ip6; 417 struct in6_addr addr6, mask6; 418 int error; 419 420 #ifdef MAC 421 error = mac_ifnet_check_transmit(ifp, m); 422 if (error) { 423 m_freem(m); 424 return (error); 425 } 426 #endif 427 428 sc = ifp->if_softc; 429 dst6 = (const struct sockaddr_in6 *)dst; 430 431 /* just in case */ 432 if ((ifp->if_flags & IFF_UP) == 0) { 433 m_freem(m); 434 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 435 return ENETDOWN; 436 } 437 438 /* 439 * If we don't have an ip4 address that match my inner ip6 address, 440 * we shouldn't generate output. Without this check, we'll end up 441 * using wrong IPv4 source. 442 */ 443 if (stf_getsrcifa6(ifp, &addr6, &mask6) != 0) { 444 m_freem(m); 445 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 446 return ENETDOWN; 447 } 448 449 if (m->m_len < sizeof(*ip6)) { 450 m = m_pullup(m, sizeof(*ip6)); 451 if (!m) { 452 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 453 return ENOBUFS; 454 } 455 } 456 ip6 = mtod(m, struct ip6_hdr *); 457 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 458 459 /* 460 * Pickup the right outer dst addr from the list of candidates. 461 * ip6_dst has priority as it may be able to give us shorter IPv4 hops. 462 */ 463 ptr = NULL; 464 if (IN6_IS_ADDR_6TO4(&ip6->ip6_dst)) 465 ptr = GET_V4(&ip6->ip6_dst); 466 else if (IN6_IS_ADDR_6TO4(&dst6->sin6_addr)) 467 ptr = GET_V4(&dst6->sin6_addr); 468 else { 469 m_freem(m); 470 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 471 return ENETUNREACH; 472 } 473 bcopy(ptr, &in4, sizeof(in4)); 474 475 if (bpf_peers_present(ifp->if_bpf)) { 476 /* 477 * We need to prepend the address family as 478 * a four byte field. Cons up a dummy header 479 * to pacify bpf. This is safe because bpf 480 * will only read from the mbuf (i.e., it won't 481 * try to free it or keep a pointer a to it). 482 */ 483 u_int af = AF_INET6; 484 bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m); 485 } 486 487 M_PREPEND(m, sizeof(struct ip), M_NOWAIT); 488 if (m == NULL) { 489 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 490 return ENOBUFS; 491 } 492 ip = mtod(m, struct ip *); 493 494 bzero(ip, sizeof(*ip)); 495 496 bcopy(GET_V4(&addr6), &ip->ip_src, sizeof(ip->ip_src)); 497 bcopy(&in4, &ip->ip_dst, sizeof(ip->ip_dst)); 498 ip->ip_p = IPPROTO_IPV6; 499 ip->ip_ttl = ip_stf_ttl; 500 ip->ip_len = htons(m->m_pkthdr.len); 501 if (ifp->if_flags & IFF_LINK1) 502 ip_ecn_ingress(ECN_ALLOWED, &ip->ip_tos, &tos); 503 else 504 ip_ecn_ingress(ECN_NOCARE, &ip->ip_tos, &tos); 505 506 M_SETFIB(m, sc->sc_fibnum); 507 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); 508 error = ip_output(m, NULL, NULL, 0, NULL, NULL); 509 510 return error; 511 } 512 513 static int 514 isrfc1918addr(struct in_addr *in) 515 { 516 /* 517 * returns 1 if private address range: 518 * 10.0.0.0/8 172.16.0.0/12 192.168.0.0/16 519 */ 520 if (stf_permit_rfc1918 == 0 && ( 521 (ntohl(in->s_addr) & 0xff000000) >> 24 == 10 || 522 (ntohl(in->s_addr) & 0xfff00000) >> 16 == 172 * 256 + 16 || 523 (ntohl(in->s_addr) & 0xffff0000) >> 16 == 192 * 256 + 168)) 524 return 1; 525 526 return 0; 527 } 528 529 static int 530 stf_checkaddr4(struct stf_softc *sc, struct in_addr *in, struct ifnet *inifp) 531 { 532 struct rm_priotracker in_ifa_tracker; 533 struct in_ifaddr *ia4; 534 535 /* 536 * reject packets with the following address: 537 * 224.0.0.0/4 0.0.0.0/8 127.0.0.0/8 255.0.0.0/8 538 */ 539 if (IN_MULTICAST(ntohl(in->s_addr))) 540 return -1; 541 switch ((ntohl(in->s_addr) & 0xff000000) >> 24) { 542 case 0: case 127: case 255: 543 return -1; 544 } 545 546 /* 547 * reject packets with private address range. 548 * (requirement from RFC3056 section 2 1st paragraph) 549 */ 550 if (isrfc1918addr(in)) 551 return -1; 552 553 /* 554 * reject packets with broadcast 555 */ 556 IN_IFADDR_RLOCK(&in_ifa_tracker); 557 CK_STAILQ_FOREACH(ia4, &V_in_ifaddrhead, ia_link) { 558 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0) 559 continue; 560 if (in->s_addr == ia4->ia_broadaddr.sin_addr.s_addr) { 561 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 562 return -1; 563 } 564 } 565 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 566 567 /* 568 * perform ingress filter 569 */ 570 if (sc && (STF2IFP(sc)->if_flags & IFF_LINK2) == 0 && inifp) { 571 struct nhop4_basic nh4; 572 573 if (fib4_lookup_nh_basic(sc->sc_fibnum, *in, 0, 0, &nh4) != 0) 574 return (-1); 575 576 if (nh4.nh_ifp != inifp) 577 return (-1); 578 } 579 580 return 0; 581 } 582 583 static int 584 stf_checkaddr6(struct stf_softc *sc, struct in6_addr *in6, struct ifnet *inifp) 585 { 586 /* 587 * check 6to4 addresses 588 */ 589 if (IN6_IS_ADDR_6TO4(in6)) { 590 struct in_addr in4; 591 bcopy(GET_V4(in6), &in4, sizeof(in4)); 592 return stf_checkaddr4(sc, &in4, inifp); 593 } 594 595 /* 596 * reject anything that look suspicious. the test is implemented 597 * in ip6_input too, but we check here as well to 598 * (1) reject bad packets earlier, and 599 * (2) to be safe against future ip6_input change. 600 */ 601 if (IN6_IS_ADDR_V4COMPAT(in6) || IN6_IS_ADDR_V4MAPPED(in6)) 602 return -1; 603 604 return 0; 605 } 606 607 static int 608 in_stf_input(struct mbuf *m, int off, int proto, void *arg) 609 { 610 struct stf_softc *sc = arg; 611 struct ip *ip; 612 struct ip6_hdr *ip6; 613 u_int8_t otos, itos; 614 struct ifnet *ifp; 615 616 NET_EPOCH_ASSERT(); 617 618 if (proto != IPPROTO_IPV6) { 619 m_freem(m); 620 return (IPPROTO_DONE); 621 } 622 623 ip = mtod(m, struct ip *); 624 if (sc == NULL || (STF2IFP(sc)->if_flags & IFF_UP) == 0) { 625 m_freem(m); 626 return (IPPROTO_DONE); 627 } 628 629 ifp = STF2IFP(sc); 630 631 #ifdef MAC 632 mac_ifnet_create_mbuf(ifp, m); 633 #endif 634 635 /* 636 * perform sanity check against outer src/dst. 637 * for source, perform ingress filter as well. 638 */ 639 if (stf_checkaddr4(sc, &ip->ip_dst, NULL) < 0 || 640 stf_checkaddr4(sc, &ip->ip_src, m->m_pkthdr.rcvif) < 0) { 641 m_freem(m); 642 return (IPPROTO_DONE); 643 } 644 645 otos = ip->ip_tos; 646 m_adj(m, off); 647 648 if (m->m_len < sizeof(*ip6)) { 649 m = m_pullup(m, sizeof(*ip6)); 650 if (!m) 651 return (IPPROTO_DONE); 652 } 653 ip6 = mtod(m, struct ip6_hdr *); 654 655 /* 656 * perform sanity check against inner src/dst. 657 * for source, perform ingress filter as well. 658 */ 659 if (stf_checkaddr6(sc, &ip6->ip6_dst, NULL) < 0 || 660 stf_checkaddr6(sc, &ip6->ip6_src, m->m_pkthdr.rcvif) < 0) { 661 m_freem(m); 662 return (IPPROTO_DONE); 663 } 664 665 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 666 if ((ifp->if_flags & IFF_LINK1) != 0) 667 ip_ecn_egress(ECN_ALLOWED, &otos, &itos); 668 else 669 ip_ecn_egress(ECN_NOCARE, &otos, &itos); 670 ip6->ip6_flow &= ~htonl(0xff << 20); 671 ip6->ip6_flow |= htonl((u_int32_t)itos << 20); 672 673 m->m_pkthdr.rcvif = ifp; 674 675 if (bpf_peers_present(ifp->if_bpf)) { 676 /* 677 * We need to prepend the address family as 678 * a four byte field. Cons up a dummy header 679 * to pacify bpf. This is safe because bpf 680 * will only read from the mbuf (i.e., it won't 681 * try to free it or keep a pointer a to it). 682 */ 683 u_int32_t af = AF_INET6; 684 bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m); 685 } 686 687 /* 688 * Put the packet to the network layer input queue according to the 689 * specified address family. 690 * See net/if_gif.c for possible issues with packet processing 691 * reorder due to extra queueing. 692 */ 693 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 694 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 695 M_SETFIB(m, ifp->if_fib); 696 netisr_dispatch(NETISR_IPV6, m); 697 return (IPPROTO_DONE); 698 } 699 700 static int 701 stf_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 702 { 703 struct ifaddr *ifa; 704 struct ifreq *ifr; 705 struct sockaddr_in6 *sin6; 706 struct in_addr addr; 707 int error, mtu; 708 709 error = 0; 710 switch (cmd) { 711 case SIOCSIFADDR: 712 ifa = (struct ifaddr *)data; 713 if (ifa == NULL || ifa->ifa_addr->sa_family != AF_INET6) { 714 error = EAFNOSUPPORT; 715 break; 716 } 717 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 718 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) { 719 error = EINVAL; 720 break; 721 } 722 bcopy(GET_V4(&sin6->sin6_addr), &addr, sizeof(addr)); 723 if (isrfc1918addr(&addr)) { 724 error = EINVAL; 725 break; 726 } 727 728 ifp->if_flags |= IFF_UP; 729 ifp->if_drv_flags |= IFF_DRV_RUNNING; 730 break; 731 732 case SIOCADDMULTI: 733 case SIOCDELMULTI: 734 ifr = (struct ifreq *)data; 735 if (ifr && ifr->ifr_addr.sa_family == AF_INET6) 736 ; 737 else 738 error = EAFNOSUPPORT; 739 break; 740 741 case SIOCGIFMTU: 742 break; 743 744 case SIOCSIFMTU: 745 ifr = (struct ifreq *)data; 746 mtu = ifr->ifr_mtu; 747 /* RFC 4213 3.2 ideal world MTU */ 748 if (mtu < IPV6_MINMTU || mtu > IF_MAXMTU - 20) 749 return (EINVAL); 750 ifp->if_mtu = mtu; 751 break; 752 753 default: 754 error = EINVAL; 755 break; 756 } 757 758 return error; 759 } 760