if_stf.c revision 129880
1/* $FreeBSD: head/sys/net/if_stf.c 129880 2004-05-30 20:27:19Z phk $ */ 2/* $KAME: if_stf.c,v 1.73 2001/12/03 11:08:30 keiichi Exp $ */ 3 4/* 5 * Copyright (C) 2000 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/* 34 * 6to4 interface, based on RFC3056. 35 * 36 * 6to4 interface is NOT capable of link-layer (I mean, IPv4) multicasting. 37 * There is no address mapping defined from IPv6 multicast address to IPv4 38 * address. Therefore, we do not have IFF_MULTICAST on the interface. 39 * 40 * Due to the lack of address mapping for link-local addresses, we cannot 41 * throw packets toward link-local addresses (fe80::x). Also, we cannot throw 42 * packets to link-local multicast addresses (ff02::x). 43 * 44 * Here are interesting symptoms due to the lack of link-local address: 45 * 46 * Unicast routing exchange: 47 * - RIPng: Impossible. Uses link-local multicast packet toward ff02::9, 48 * and link-local addresses as nexthop. 49 * - OSPFv6: Impossible. OSPFv6 assumes that there's link-local address 50 * assigned to the link, and makes use of them. Also, HELLO packets use 51 * link-local multicast addresses (ff02::5 and ff02::6). 52 * - BGP4+: Maybe. You can only use global address as nexthop, and global 53 * address as TCP endpoint address. 54 * 55 * Multicast routing protocols: 56 * - PIM: Hello packet cannot be used to discover adjacent PIM routers. 57 * Adjacent PIM routers must be configured manually (is it really spec-wise 58 * correct thing to do?). 59 * 60 * ICMPv6: 61 * - Redirects cannot be used due to the lack of link-local address. 62 * 63 * stf interface does not have, and will not need, a link-local address. 64 * It seems to have no real benefit and does not help the above symptoms much. 65 * Even if we assign link-locals to interface, we cannot really 66 * use link-local unicast/multicast on top of 6to4 cloud (since there's no 67 * encapsulation defined for link-local address), and the above analysis does 68 * not change. RFC3056 does not mandate the assignment of link-local address 69 * either. 70 * 71 * 6to4 interface has security issues. Refer to 72 * http://playground.iijlab.net/i-d/draft-itojun-ipv6-transition-abuse-00.txt 73 * for details. The code tries to filter out some of malicious packets. 74 * Note that there is no way to be 100% secure. 75 */ 76 77#include "opt_inet.h" 78#include "opt_inet6.h" 79#include "opt_mac.h" 80 81#include <sys/param.h> 82#include <sys/systm.h> 83#include <sys/socket.h> 84#include <sys/sockio.h> 85#include <sys/mac.h> 86#include <sys/mbuf.h> 87#include <sys/errno.h> 88#include <sys/kernel.h> 89#include <sys/module.h> 90#include <sys/protosw.h> 91#include <sys/queue.h> 92#include <machine/cpu.h> 93 94#include <sys/malloc.h> 95 96#include <net/if.h> 97#include <net/route.h> 98#include <net/netisr.h> 99#include <net/if_types.h> 100#include <net/if_stf.h> 101 102#include <netinet/in.h> 103#include <netinet/in_systm.h> 104#include <netinet/ip.h> 105#include <netinet/ip_var.h> 106#include <netinet/in_var.h> 107 108#include <netinet/ip6.h> 109#include <netinet6/ip6_var.h> 110#include <netinet6/in6_var.h> 111#include <netinet/ip_ecn.h> 112 113#include <netinet/ip_encap.h> 114 115#include <machine/stdarg.h> 116 117#include <net/net_osdep.h> 118 119#include <net/bpf.h> 120 121#define STFNAME "stf" 122 123#define IN6_IS_ADDR_6TO4(x) (ntohs((x)->s6_addr16[0]) == 0x2002) 124 125/* 126 * XXX: Return a pointer with 16-bit aligned. Don't cast it to 127 * struct in_addr *; use bcopy() instead. 128 */ 129#define GET_V4(x) ((caddr_t)(&(x)->s6_addr16[1])) 130 131struct stf_softc { 132 struct ifnet sc_if; /* common area */ 133 union { 134 struct route __sc_ro4; 135 struct route_in6 __sc_ro6; /* just for safety */ 136 } __sc_ro46; 137#define sc_ro __sc_ro46.__sc_ro4 138 const struct encaptab *encap_cookie; 139 LIST_ENTRY(stf_softc) sc_list; /* all stf's are linked */ 140}; 141 142/* 143 * All mutable global variables in if_stf.c are protected by stf_mtx. 144 * XXXRW: Note that mutable fields in the softc are not currently locked: 145 * in particular, sc_ro needs to be protected from concurrent entrance 146 * of stf_output(). 147 */ 148static struct mtx stf_mtx; 149static LIST_HEAD(, stf_softc) stf_softc_list; 150 151static MALLOC_DEFINE(M_STF, STFNAME, "6to4 Tunnel Interface"); 152static const int ip_stf_ttl = 40; 153 154extern struct domain inetdomain; 155struct protosw in_stf_protosw = 156{ SOCK_RAW, &inetdomain, IPPROTO_IPV6, PR_ATOMIC|PR_ADDR, 157 in_stf_input, (pr_output_t*)rip_output, 0, rip_ctloutput, 158 0, 159 0, 0, 0, 0, 160 &rip_usrreqs 161}; 162 163static int stfmodevent(module_t, int, void *); 164static int stf_encapcheck(const struct mbuf *, int, int, void *); 165static struct in6_ifaddr *stf_getsrcifa6(struct ifnet *); 166static int stf_output(struct ifnet *, struct mbuf *, struct sockaddr *, 167 struct rtentry *); 168static int isrfc1918addr(struct in_addr *); 169static int stf_checkaddr4(struct stf_softc *, struct in_addr *, 170 struct ifnet *); 171static int stf_checkaddr6(struct stf_softc *, struct in6_addr *, 172 struct ifnet *); 173static void stf_rtrequest(int, struct rtentry *, struct rt_addrinfo *); 174static int stf_ioctl(struct ifnet *, u_long, caddr_t); 175 176static int stf_clone_create(struct if_clone *, int); 177static void stf_clone_destroy(struct ifnet *); 178 179/* only one clone is currently allowed */ 180struct if_clone stf_cloner = 181 IF_CLONE_INITIALIZER(STFNAME, stf_clone_create, stf_clone_destroy, 0, 0); 182 183static int 184stf_clone_create(ifc, unit) 185 struct if_clone *ifc; 186 int unit; 187{ 188 struct stf_softc *sc; 189 struct ifnet *ifp; 190 191 sc = malloc(sizeof(struct stf_softc), M_STF, M_WAITOK | M_ZERO); 192 ifp = &sc->sc_if; 193 if_initname(ifp, ifc->ifc_name, unit); 194 195 sc->encap_cookie = encap_attach_func(AF_INET, IPPROTO_IPV6, 196 stf_encapcheck, &in_stf_protosw, sc); 197 if (sc->encap_cookie == NULL) { 198 if_printf(ifp, "attach failed\n"); 199 free(sc, M_STF); 200 return (ENOMEM); 201 } 202 203 ifp->if_mtu = IPV6_MMTU; 204 ifp->if_ioctl = stf_ioctl; 205 ifp->if_output = stf_output; 206 ifp->if_type = IFT_STF; 207 ifp->if_snd.ifq_maxlen = IFQ_MAXLEN; 208 if_attach(ifp); 209 bpfattach(ifp, DLT_NULL, sizeof(u_int)); 210 mtx_lock(&stf_mtx); 211 LIST_INSERT_HEAD(&stf_softc_list, sc, sc_list); 212 mtx_unlock(&stf_mtx); 213 return (0); 214} 215 216static void 217stf_destroy(struct stf_softc *sc) 218{ 219 int err; 220 221 err = encap_detach(sc->encap_cookie); 222 KASSERT(err == 0, ("Unexpected error detaching encap_cookie")); 223 bpfdetach(&sc->sc_if); 224 if_detach(&sc->sc_if); 225 226 free(sc, M_STF); 227} 228 229static void 230stf_clone_destroy(ifp) 231 struct ifnet *ifp; 232{ 233 struct stf_softc *sc = (void *) ifp; 234 235 mtx_lock(&stf_mtx); 236 LIST_REMOVE(sc, sc_list); 237 mtx_unlock(&stf_mtx); 238 239 stf_destroy(sc); 240} 241 242static int 243stfmodevent(mod, type, data) 244 module_t mod; 245 int type; 246 void *data; 247{ 248 struct stf_softc *sc; 249 250 switch (type) { 251 case MOD_LOAD: 252 mtx_init(&stf_mtx, "stf_mtx", NULL, MTX_DEF); 253 LIST_INIT(&stf_softc_list); 254 if_clone_attach(&stf_cloner); 255 256 break; 257 case MOD_UNLOAD: 258 if_clone_detach(&stf_cloner); 259 260 mtx_lock(&stf_mtx); 261 while ((sc = LIST_FIRST(&stf_softc_list)) != NULL) { 262 LIST_REMOVE(sc, sc_list); 263 mtx_unlock(&stf_mtx); 264 stf_destroy(sc); 265 mtx_lock(&stf_mtx); 266 } 267 mtx_unlock(&stf_mtx); 268 mtx_destroy(&stf_mtx); 269 break; 270 } 271 272 return (0); 273} 274 275static moduledata_t stf_mod = { 276 "if_stf", 277 stfmodevent, 278 0 279}; 280 281DECLARE_MODULE(if_stf, stf_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 282 283static int 284stf_encapcheck(m, off, proto, arg) 285 const struct mbuf *m; 286 int off; 287 int proto; 288 void *arg; 289{ 290 struct ip ip; 291 struct in6_ifaddr *ia6; 292 struct stf_softc *sc; 293 struct in_addr a, b, mask; 294 295 sc = (struct stf_softc *)arg; 296 if (sc == NULL) 297 return 0; 298 299 if ((sc->sc_if.if_flags & IFF_UP) == 0) 300 return 0; 301 302 /* IFF_LINK0 means "no decapsulation" */ 303 if ((sc->sc_if.if_flags & IFF_LINK0) != 0) 304 return 0; 305 306 if (proto != IPPROTO_IPV6) 307 return 0; 308 309 /* LINTED const cast */ 310 m_copydata((struct mbuf *)(uintptr_t)m, 0, sizeof(ip), (caddr_t)&ip); 311 312 if (ip.ip_v != 4) 313 return 0; 314 315 ia6 = stf_getsrcifa6(&sc->sc_if); 316 if (ia6 == NULL) 317 return 0; 318 319 /* 320 * check if IPv4 dst matches the IPv4 address derived from the 321 * local 6to4 address. 322 * success on: dst = 10.1.1.1, ia6->ia_addr = 2002:0a01:0101:... 323 */ 324 if (bcmp(GET_V4(&ia6->ia_addr.sin6_addr), &ip.ip_dst, 325 sizeof(ip.ip_dst)) != 0) 326 return 0; 327 328 /* 329 * check if IPv4 src matches the IPv4 address derived from the 330 * local 6to4 address masked by prefixmask. 331 * success on: src = 10.1.1.1, ia6->ia_addr = 2002:0a00:.../24 332 * fail on: src = 10.1.1.1, ia6->ia_addr = 2002:0b00:.../24 333 */ 334 bzero(&a, sizeof(a)); 335 bcopy(GET_V4(&ia6->ia_addr.sin6_addr), &a, sizeof(a)); 336 bcopy(GET_V4(&ia6->ia_prefixmask.sin6_addr), &mask, sizeof(mask)); 337 a.s_addr &= mask.s_addr; 338 b = ip.ip_src; 339 b.s_addr &= mask.s_addr; 340 if (a.s_addr != b.s_addr) 341 return 0; 342 343 /* stf interface makes single side match only */ 344 return 32; 345} 346 347static struct in6_ifaddr * 348stf_getsrcifa6(ifp) 349 struct ifnet *ifp; 350{ 351 struct ifaddr *ia; 352 struct in_ifaddr *ia4; 353 struct sockaddr_in6 *sin6; 354 struct in_addr in; 355 356 for (ia = TAILQ_FIRST(&ifp->if_addrlist); 357 ia; 358 ia = TAILQ_NEXT(ia, ifa_list)) 359 { 360 if (ia->ifa_addr == NULL) 361 continue; 362 if (ia->ifa_addr->sa_family != AF_INET6) 363 continue; 364 sin6 = (struct sockaddr_in6 *)ia->ifa_addr; 365 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) 366 continue; 367 368 bcopy(GET_V4(&sin6->sin6_addr), &in, sizeof(in)); 369 LIST_FOREACH(ia4, INADDR_HASH(in.s_addr), ia_hash) 370 if (ia4->ia_addr.sin_addr.s_addr == in.s_addr) 371 break; 372 if (ia4 == NULL) 373 continue; 374 375 return (struct in6_ifaddr *)ia; 376 } 377 378 return NULL; 379} 380 381static int 382stf_output(ifp, m, dst, rt) 383 struct ifnet *ifp; 384 struct mbuf *m; 385 struct sockaddr *dst; 386 struct rtentry *rt; 387{ 388 struct stf_softc *sc; 389 struct sockaddr_in6 *dst6; 390 struct in_addr in4; 391 caddr_t ptr; 392 struct sockaddr_in *dst4; 393 u_int8_t tos; 394 struct ip *ip; 395 struct ip6_hdr *ip6; 396 struct in6_ifaddr *ia6; 397#ifdef MAC 398 int error; 399 400 error = mac_check_ifnet_transmit(ifp, m); 401 if (error) { 402 m_freem(m); 403 return (error); 404 } 405#endif 406 407 sc = (struct stf_softc*)ifp; 408 dst6 = (struct sockaddr_in6 *)dst; 409 410 /* just in case */ 411 if ((ifp->if_flags & IFF_UP) == 0) { 412 m_freem(m); 413 ifp->if_oerrors++; 414 return ENETDOWN; 415 } 416 417 /* 418 * If we don't have an ip4 address that match my inner ip6 address, 419 * we shouldn't generate output. Without this check, we'll end up 420 * using wrong IPv4 source. 421 */ 422 ia6 = stf_getsrcifa6(ifp); 423 if (ia6 == NULL) { 424 m_freem(m); 425 ifp->if_oerrors++; 426 return ENETDOWN; 427 } 428 429 if (m->m_len < sizeof(*ip6)) { 430 m = m_pullup(m, sizeof(*ip6)); 431 if (!m) { 432 ifp->if_oerrors++; 433 return ENOBUFS; 434 } 435 } 436 ip6 = mtod(m, struct ip6_hdr *); 437 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 438 439 /* 440 * Pickup the right outer dst addr from the list of candidates. 441 * ip6_dst has priority as it may be able to give us shorter IPv4 hops. 442 */ 443 ptr = NULL; 444 if (IN6_IS_ADDR_6TO4(&ip6->ip6_dst)) 445 ptr = GET_V4(&ip6->ip6_dst); 446 else if (IN6_IS_ADDR_6TO4(&dst6->sin6_addr)) 447 ptr = GET_V4(&dst6->sin6_addr); 448 else { 449 m_freem(m); 450 ifp->if_oerrors++; 451 return ENETUNREACH; 452 } 453 bcopy(ptr, &in4, sizeof(in4)); 454 455#if NBPFILTER > 0 456 if (ifp->if_bpf) { 457 /* 458 * We need to prepend the address family as 459 * a four byte field. Cons up a dummy header 460 * to pacify bpf. This is safe because bpf 461 * will only read from the mbuf (i.e., it won't 462 * try to free it or keep a pointer a to it). 463 */ 464 u_int32_t af = AF_INET6; 465#ifdef HAVE_OLD_BPF 466 struct mbuf m0; 467 468 m0.m_next = m; 469 m0.m_len = 4; 470 m0.m_data = (char *)⁡ 471 472 BPF_MTAP(ifp, &m0); 473#else 474 bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m); 475#endif 476 } 477#endif /*NBPFILTER > 0*/ 478 479 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 480 if (m && m->m_len < sizeof(struct ip)) 481 m = m_pullup(m, sizeof(struct ip)); 482 if (m == NULL) { 483 ifp->if_oerrors++; 484 return ENOBUFS; 485 } 486 ip = mtod(m, struct ip *); 487 488 bzero(ip, sizeof(*ip)); 489 490 bcopy(GET_V4(&((struct sockaddr_in6 *)&ia6->ia_addr)->sin6_addr), 491 &ip->ip_src, sizeof(ip->ip_src)); 492 bcopy(&in4, &ip->ip_dst, sizeof(ip->ip_dst)); 493 ip->ip_p = IPPROTO_IPV6; 494 ip->ip_ttl = ip_stf_ttl; 495 ip->ip_len = m->m_pkthdr.len; /*host order*/ 496 if (ifp->if_flags & IFF_LINK1) 497 ip_ecn_ingress(ECN_ALLOWED, &ip->ip_tos, &tos); 498 else 499 ip_ecn_ingress(ECN_NOCARE, &ip->ip_tos, &tos); 500 501 /* 502 * XXXRW: Locking of sc_ro required. 503 */ 504 dst4 = (struct sockaddr_in *)&sc->sc_ro.ro_dst; 505 if (dst4->sin_family != AF_INET || 506 bcmp(&dst4->sin_addr, &ip->ip_dst, sizeof(ip->ip_dst)) != 0) { 507 /* cache route doesn't match */ 508 dst4->sin_family = AF_INET; 509 dst4->sin_len = sizeof(struct sockaddr_in); 510 bcopy(&ip->ip_dst, &dst4->sin_addr, sizeof(dst4->sin_addr)); 511 if (sc->sc_ro.ro_rt) { 512 RTFREE(sc->sc_ro.ro_rt); 513 sc->sc_ro.ro_rt = NULL; 514 } 515 } 516 517 if (sc->sc_ro.ro_rt == NULL) { 518 rtalloc(&sc->sc_ro); 519 if (sc->sc_ro.ro_rt == NULL) { 520 m_freem(m); 521 ifp->if_oerrors++; 522 return ENETUNREACH; 523 } 524 } 525 526 ifp->if_opackets++; 527 return ip_output(m, NULL, &sc->sc_ro, 0, NULL, NULL); 528} 529 530static int 531isrfc1918addr(in) 532 struct in_addr *in; 533{ 534 /* 535 * returns 1 if private address range: 536 * 10.0.0.0/8 172.16.0.0/12 192.168.0.0/16 537 */ 538 if ((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 546static int 547stf_checkaddr4(sc, in, inifp) 548 struct stf_softc *sc; 549 struct in_addr *in; 550 struct ifnet *inifp; /* incoming interface */ 551{ 552 struct in_ifaddr *ia4; 553 554 /* 555 * reject packets with the following address: 556 * 224.0.0.0/4 0.0.0.0/8 127.0.0.0/8 255.0.0.0/8 557 */ 558 if (IN_MULTICAST(ntohl(in->s_addr))) 559 return -1; 560 switch ((ntohl(in->s_addr) & 0xff000000) >> 24) { 561 case 0: case 127: case 255: 562 return -1; 563 } 564 565 /* 566 * reject packets with private address range. 567 * (requirement from RFC3056 section 2 1st paragraph) 568 */ 569 if (isrfc1918addr(in)) 570 return -1; 571 572 /* 573 * reject packets with broadcast 574 */ 575 for (ia4 = TAILQ_FIRST(&in_ifaddrhead); 576 ia4; 577 ia4 = TAILQ_NEXT(ia4, ia_link)) 578 { 579 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0) 580 continue; 581 if (in->s_addr == ia4->ia_broadaddr.sin_addr.s_addr) 582 return -1; 583 } 584 585 /* 586 * perform ingress filter 587 */ 588 if (sc && (sc->sc_if.if_flags & IFF_LINK2) == 0 && inifp) { 589 struct sockaddr_in sin; 590 struct rtentry *rt; 591 592 bzero(&sin, sizeof(sin)); 593 sin.sin_family = AF_INET; 594 sin.sin_len = sizeof(struct sockaddr_in); 595 sin.sin_addr = *in; 596 rt = rtalloc1((struct sockaddr *)&sin, 0, 0UL); 597 if (!rt || rt->rt_ifp != inifp) { 598#if 0 599 log(LOG_WARNING, "%s: packet from 0x%x dropped " 600 "due to ingress filter\n", if_name(&sc->sc_if), 601 (u_int32_t)ntohl(sin.sin_addr.s_addr)); 602#endif 603 if (rt) 604 rtfree(rt); 605 return -1; 606 } 607 rtfree(rt); 608 } 609 610 return 0; 611} 612 613static int 614stf_checkaddr6(sc, in6, inifp) 615 struct stf_softc *sc; 616 struct in6_addr *in6; 617 struct ifnet *inifp; /* incoming interface */ 618{ 619 /* 620 * check 6to4 addresses 621 */ 622 if (IN6_IS_ADDR_6TO4(in6)) { 623 struct in_addr in4; 624 bcopy(GET_V4(in6), &in4, sizeof(in4)); 625 return stf_checkaddr4(sc, &in4, inifp); 626 } 627 628 /* 629 * reject anything that look suspicious. the test is implemented 630 * in ip6_input too, but we check here as well to 631 * (1) reject bad packets earlier, and 632 * (2) to be safe against future ip6_input change. 633 */ 634 if (IN6_IS_ADDR_V4COMPAT(in6) || IN6_IS_ADDR_V4MAPPED(in6)) 635 return -1; 636 637 return 0; 638} 639 640void 641in_stf_input(m, off) 642 struct mbuf *m; 643 int off; 644{ 645 int proto; 646 struct stf_softc *sc; 647 struct ip *ip; 648 struct ip6_hdr *ip6; 649 u_int8_t otos, itos; 650 struct ifnet *ifp; 651 652 proto = mtod(m, struct ip *)->ip_p; 653 654 if (proto != IPPROTO_IPV6) { 655 m_freem(m); 656 return; 657 } 658 659 ip = mtod(m, struct ip *); 660 661 sc = (struct stf_softc *)encap_getarg(m); 662 663 if (sc == NULL || (sc->sc_if.if_flags & IFF_UP) == 0) { 664 m_freem(m); 665 return; 666 } 667 668 ifp = &sc->sc_if; 669 670#ifdef MAC 671 mac_create_mbuf_from_ifnet(ifp, m); 672#endif 673 674 /* 675 * perform sanity check against outer src/dst. 676 * for source, perform ingress filter as well. 677 */ 678 if (stf_checkaddr4(sc, &ip->ip_dst, NULL) < 0 || 679 stf_checkaddr4(sc, &ip->ip_src, m->m_pkthdr.rcvif) < 0) { 680 m_freem(m); 681 return; 682 } 683 684 otos = ip->ip_tos; 685 m_adj(m, off); 686 687 if (m->m_len < sizeof(*ip6)) { 688 m = m_pullup(m, sizeof(*ip6)); 689 if (!m) 690 return; 691 } 692 ip6 = mtod(m, struct ip6_hdr *); 693 694 /* 695 * perform sanity check against inner src/dst. 696 * for source, perform ingress filter as well. 697 */ 698 if (stf_checkaddr6(sc, &ip6->ip6_dst, NULL) < 0 || 699 stf_checkaddr6(sc, &ip6->ip6_src, m->m_pkthdr.rcvif) < 0) { 700 m_freem(m); 701 return; 702 } 703 704 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 705 if ((ifp->if_flags & IFF_LINK1) != 0) 706 ip_ecn_egress(ECN_ALLOWED, &otos, &itos); 707 else 708 ip_ecn_egress(ECN_NOCARE, &otos, &itos); 709 ip6->ip6_flow &= ~htonl(0xff << 20); 710 ip6->ip6_flow |= htonl((u_int32_t)itos << 20); 711 712 m->m_pkthdr.rcvif = ifp; 713 714 if (ifp->if_bpf) { 715 /* 716 * We need to prepend the address family as 717 * a four byte field. Cons up a dummy header 718 * to pacify bpf. This is safe because bpf 719 * will only read from the mbuf (i.e., it won't 720 * try to free it or keep a pointer a to it). 721 */ 722 u_int32_t af = AF_INET6; 723#ifdef HAVE_OLD_BPF 724 struct mbuf m0; 725 726 m0.m_next = m; 727 m0.m_len = 4; 728 m0.m_data = (char *)⁡ 729 730 BPF_MTAP(ifp, &m0); 731#else 732 bpf_mtap2(ifp->if_bpf, &af, sizeof(ah), m); 733#endif 734 } 735 736 /* 737 * Put the packet to the network layer input queue according to the 738 * specified address family. 739 * See net/if_gif.c for possible issues with packet processing 740 * reorder due to extra queueing. 741 */ 742 ifp->if_ipackets++; 743 ifp->if_ibytes += m->m_pkthdr.len; 744 netisr_dispatch(NETISR_IPV6, m); 745} 746 747/* ARGSUSED */ 748static void 749stf_rtrequest(cmd, rt, info) 750 int cmd; 751 struct rtentry *rt; 752 struct rt_addrinfo *info; 753{ 754 RT_LOCK_ASSERT(rt); 755 756 if (rt) 757 rt->rt_rmx.rmx_mtu = IPV6_MMTU; 758} 759 760static int 761stf_ioctl(ifp, cmd, data) 762 struct ifnet *ifp; 763 u_long cmd; 764 caddr_t data; 765{ 766 struct ifaddr *ifa; 767 struct ifreq *ifr; 768 struct sockaddr_in6 *sin6; 769 struct in_addr addr; 770 int error; 771 772 error = 0; 773 switch (cmd) { 774 case SIOCSIFADDR: 775 ifa = (struct ifaddr *)data; 776 if (ifa == NULL || ifa->ifa_addr->sa_family != AF_INET6) { 777 error = EAFNOSUPPORT; 778 break; 779 } 780 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 781 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) { 782 error = EINVAL; 783 break; 784 } 785 bcopy(GET_V4(&sin6->sin6_addr), &addr, sizeof(addr)); 786 if (isrfc1918addr(&addr)) { 787 error = EINVAL; 788 break; 789 } 790 791 ifa->ifa_rtrequest = stf_rtrequest; 792 ifp->if_flags |= IFF_UP; 793 break; 794 795 case SIOCADDMULTI: 796 case SIOCDELMULTI: 797 ifr = (struct ifreq *)data; 798 if (ifr && ifr->ifr_addr.sa_family == AF_INET6) 799 ; 800 else 801 error = EAFNOSUPPORT; 802 break; 803 804 default: 805 error = EINVAL; 806 break; 807 } 808 809 return error; 810} 811