if_stf.c revision 128417
1/* $FreeBSD: head/sys/net/if_stf.c 128417 2004-04-19 05:06:27Z brooks $ */ 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/protosw.h> 90#include <sys/queue.h> 91#include <machine/cpu.h> 92 93#include <sys/malloc.h> 94 95#include <net/if.h> 96#include <net/route.h> 97#include <net/netisr.h> 98#include <net/if_types.h> 99#include <net/if_stf.h> 100 101#include <netinet/in.h> 102#include <netinet/in_systm.h> 103#include <netinet/ip.h> 104#include <netinet/ip_var.h> 105#include <netinet/in_var.h> 106 107#include <netinet/ip6.h> 108#include <netinet6/ip6_var.h> 109#include <netinet6/in6_var.h> 110#include <netinet/ip_ecn.h> 111 112#include <netinet/ip_encap.h> 113 114#include <machine/stdarg.h> 115 116#include <net/net_osdep.h> 117 118#include <net/bpf.h> 119 120#define STFNAME "stf" 121 122#define IN6_IS_ADDR_6TO4(x) (ntohs((x)->s6_addr16[0]) == 0x2002) 123 124/* 125 * XXX: Return a pointer with 16-bit aligned. Don't cast it to 126 * struct in_addr *; use bcopy() instead. 127 */ 128#define GET_V4(x) ((caddr_t)(&(x)->s6_addr16[1])) 129 130struct stf_softc { 131 struct ifnet sc_if; /* common area */ 132 union { 133 struct route __sc_ro4; 134 struct route_in6 __sc_ro6; /* just for safety */ 135 } __sc_ro46; 136#define sc_ro __sc_ro46.__sc_ro4 137 const struct encaptab *encap_cookie; 138 LIST_ENTRY(stf_softc) sc_list; /* all stf's are linked */ 139}; 140 141/* 142 * All mutable global variables in if_stf.c are protected by stf_mtx. 143 * XXXRW: Note that mutable fields in the softc are not currently locked: 144 * in particular, sc_ro needs to be protected from concurrent entrance 145 * of stf_output(). 146 */ 147static struct mtx stf_mtx; 148static LIST_HEAD(, stf_softc) stf_softc_list; 149 150static MALLOC_DEFINE(M_STF, STFNAME, "6to4 Tunnel Interface"); 151static const int ip_stf_ttl = 40; 152 153extern struct domain inetdomain; 154struct protosw in_stf_protosw = 155{ SOCK_RAW, &inetdomain, IPPROTO_IPV6, PR_ATOMIC|PR_ADDR, 156 in_stf_input, (pr_output_t*)rip_output, 0, rip_ctloutput, 157 0, 158 0, 0, 0, 0, 159 &rip_usrreqs 160}; 161 162static int stfmodevent(module_t, int, void *); 163static int stf_encapcheck(const struct mbuf *, int, int, void *); 164static struct in6_ifaddr *stf_getsrcifa6(struct ifnet *); 165static int stf_output(struct ifnet *, struct mbuf *, struct sockaddr *, 166 struct rtentry *); 167static int isrfc1918addr(struct in_addr *); 168static int stf_checkaddr4(struct stf_softc *, struct in_addr *, 169 struct ifnet *); 170static int stf_checkaddr6(struct stf_softc *, struct in6_addr *, 171 struct ifnet *); 172static void stf_rtrequest(int, struct rtentry *, struct rt_addrinfo *); 173static int stf_ioctl(struct ifnet *, u_long, caddr_t); 174 175static int stf_clone_create(struct if_clone *, int); 176static void stf_clone_destroy(struct ifnet *); 177 178/* only one clone is currently allowed */ 179struct if_clone stf_cloner = 180 IF_CLONE_INITIALIZER(STFNAME, stf_clone_create, stf_clone_destroy, 0, 0); 181 182static int 183stf_clone_create(ifc, unit) 184 struct if_clone *ifc; 185 int unit; 186{ 187 struct stf_softc *sc; 188 struct ifnet *ifp; 189 190 sc = malloc(sizeof(struct stf_softc), M_STF, M_WAITOK | M_ZERO); 191 ifp = &sc->sc_if; 192 if_initname(ifp, ifc->ifc_name, unit); 193 194 sc->encap_cookie = encap_attach_func(AF_INET, IPPROTO_IPV6, 195 stf_encapcheck, &in_stf_protosw, sc); 196 if (sc->encap_cookie == NULL) { 197 if_printf(ifp, "attach failed\n"); 198 free(sc, M_STF); 199 return (ENOMEM); 200 } 201 202 ifp->if_mtu = IPV6_MMTU; 203 ifp->if_ioctl = stf_ioctl; 204 ifp->if_output = stf_output; 205 ifp->if_type = IFT_STF; 206 ifp->if_snd.ifq_maxlen = IFQ_MAXLEN; 207 if_attach(ifp); 208 bpfattach(ifp, DLT_NULL, sizeof(u_int)); 209 mtx_lock(&stf_mtx); 210 LIST_INSERT_HEAD(&stf_softc_list, sc, sc_list); 211 mtx_unlock(&stf_mtx); 212 return (0); 213} 214 215static void 216stf_destroy(struct stf_softc *sc) 217{ 218 int err; 219 220 err = encap_detach(sc->encap_cookie); 221 KASSERT(err == 0, ("Unexpected error detaching encap_cookie")); 222 bpfdetach(&sc->sc_if); 223 if_detach(&sc->sc_if); 224 225 free(sc, M_STF); 226} 227 228static void 229stf_clone_destroy(ifp) 230 struct ifnet *ifp; 231{ 232 struct stf_softc *sc = (void *) ifp; 233 234 mtx_lock(&stf_mtx); 235 LIST_REMOVE(sc, sc_list); 236 mtx_unlock(&stf_mtx); 237 238 stf_destroy(sc); 239} 240 241static int 242stfmodevent(mod, type, data) 243 module_t mod; 244 int type; 245 void *data; 246{ 247 struct stf_softc *sc; 248 249 switch (type) { 250 case MOD_LOAD: 251 mtx_init(&stf_mtx, "stf_mtx", NULL, MTX_DEF); 252 LIST_INIT(&stf_softc_list); 253 if_clone_attach(&stf_cloner); 254 255 break; 256 case MOD_UNLOAD: 257 if_clone_detach(&stf_cloner); 258 259 mtx_lock(&stf_mtx); 260 while ((sc = LIST_FIRST(&stf_softc_list)) != NULL) { 261 LIST_REMOVE(sc, sc_list); 262 mtx_unlock(&stf_mtx); 263 stf_destroy(sc); 264 mtx_lock(&stf_mtx); 265 } 266 mtx_unlock(&stf_mtx); 267 mtx_destroy(&stf_mtx); 268 break; 269 } 270 271 return (0); 272} 273 274static moduledata_t stf_mod = { 275 "if_stf", 276 stfmodevent, 277 0 278}; 279 280DECLARE_MODULE(if_stf, stf_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 281 282static int 283stf_encapcheck(m, off, proto, arg) 284 const struct mbuf *m; 285 int off; 286 int proto; 287 void *arg; 288{ 289 struct ip ip; 290 struct in6_ifaddr *ia6; 291 struct stf_softc *sc; 292 struct in_addr a, b, mask; 293 294 sc = (struct stf_softc *)arg; 295 if (sc == NULL) 296 return 0; 297 298 if ((sc->sc_if.if_flags & IFF_UP) == 0) 299 return 0; 300 301 /* IFF_LINK0 means "no decapsulation" */ 302 if ((sc->sc_if.if_flags & IFF_LINK0) != 0) 303 return 0; 304 305 if (proto != IPPROTO_IPV6) 306 return 0; 307 308 /* LINTED const cast */ 309 m_copydata((struct mbuf *)(uintptr_t)m, 0, sizeof(ip), (caddr_t)&ip); 310 311 if (ip.ip_v != 4) 312 return 0; 313 314 ia6 = stf_getsrcifa6(&sc->sc_if); 315 if (ia6 == NULL) 316 return 0; 317 318 /* 319 * check if IPv4 dst matches the IPv4 address derived from the 320 * local 6to4 address. 321 * success on: dst = 10.1.1.1, ia6->ia_addr = 2002:0a01:0101:... 322 */ 323 if (bcmp(GET_V4(&ia6->ia_addr.sin6_addr), &ip.ip_dst, 324 sizeof(ip.ip_dst)) != 0) 325 return 0; 326 327 /* 328 * check if IPv4 src matches the IPv4 address derived from the 329 * local 6to4 address masked by prefixmask. 330 * success on: src = 10.1.1.1, ia6->ia_addr = 2002:0a00:.../24 331 * fail on: src = 10.1.1.1, ia6->ia_addr = 2002:0b00:.../24 332 */ 333 bzero(&a, sizeof(a)); 334 bcopy(GET_V4(&ia6->ia_addr.sin6_addr), &a, sizeof(a)); 335 bcopy(GET_V4(&ia6->ia_prefixmask.sin6_addr), &mask, sizeof(mask)); 336 a.s_addr &= mask.s_addr; 337 b = ip.ip_src; 338 b.s_addr &= mask.s_addr; 339 if (a.s_addr != b.s_addr) 340 return 0; 341 342 /* stf interface makes single side match only */ 343 return 32; 344} 345 346static struct in6_ifaddr * 347stf_getsrcifa6(ifp) 348 struct ifnet *ifp; 349{ 350 struct ifaddr *ia; 351 struct in_ifaddr *ia4; 352 struct sockaddr_in6 *sin6; 353 struct in_addr in; 354 355 for (ia = TAILQ_FIRST(&ifp->if_addrlist); 356 ia; 357 ia = TAILQ_NEXT(ia, ifa_list)) 358 { 359 if (ia->ifa_addr == NULL) 360 continue; 361 if (ia->ifa_addr->sa_family != AF_INET6) 362 continue; 363 sin6 = (struct sockaddr_in6 *)ia->ifa_addr; 364 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) 365 continue; 366 367 bcopy(GET_V4(&sin6->sin6_addr), &in, sizeof(in)); 368 LIST_FOREACH(ia4, INADDR_HASH(in.s_addr), ia_hash) 369 if (ia4->ia_addr.sin_addr.s_addr == in.s_addr) 370 break; 371 if (ia4 == NULL) 372 continue; 373 374 return (struct in6_ifaddr *)ia; 375 } 376 377 return NULL; 378} 379 380static int 381stf_output(ifp, m, dst, rt) 382 struct ifnet *ifp; 383 struct mbuf *m; 384 struct sockaddr *dst; 385 struct rtentry *rt; 386{ 387 struct stf_softc *sc; 388 struct sockaddr_in6 *dst6; 389 struct in_addr in4; 390 caddr_t ptr; 391 struct sockaddr_in *dst4; 392 u_int8_t tos; 393 struct ip *ip; 394 struct ip6_hdr *ip6; 395 struct in6_ifaddr *ia6; 396#ifdef MAC 397 int error; 398 399 error = mac_check_ifnet_transmit(ifp, m); 400 if (error) { 401 m_freem(m); 402 return (error); 403 } 404#endif 405 406 sc = (struct stf_softc*)ifp; 407 dst6 = (struct sockaddr_in6 *)dst; 408 409 /* just in case */ 410 if ((ifp->if_flags & IFF_UP) == 0) { 411 m_freem(m); 412 ifp->if_oerrors++; 413 return ENETDOWN; 414 } 415 416 /* 417 * If we don't have an ip4 address that match my inner ip6 address, 418 * we shouldn't generate output. Without this check, we'll end up 419 * using wrong IPv4 source. 420 */ 421 ia6 = stf_getsrcifa6(ifp); 422 if (ia6 == NULL) { 423 m_freem(m); 424 ifp->if_oerrors++; 425 return ENETDOWN; 426 } 427 428 if (m->m_len < sizeof(*ip6)) { 429 m = m_pullup(m, sizeof(*ip6)); 430 if (!m) { 431 ifp->if_oerrors++; 432 return ENOBUFS; 433 } 434 } 435 ip6 = mtod(m, struct ip6_hdr *); 436 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 437 438 /* 439 * Pickup the right outer dst addr from the list of candidates. 440 * ip6_dst has priority as it may be able to give us shorter IPv4 hops. 441 */ 442 ptr = NULL; 443 if (IN6_IS_ADDR_6TO4(&ip6->ip6_dst)) 444 ptr = GET_V4(&ip6->ip6_dst); 445 else if (IN6_IS_ADDR_6TO4(&dst6->sin6_addr)) 446 ptr = GET_V4(&dst6->sin6_addr); 447 else { 448 m_freem(m); 449 ifp->if_oerrors++; 450 return ENETUNREACH; 451 } 452 bcopy(ptr, &in4, sizeof(in4)); 453 454#if NBPFILTER > 0 455 if (ifp->if_bpf) { 456 /* 457 * We need to prepend the address family as 458 * a four byte field. Cons up a dummy header 459 * to pacify bpf. This is safe because bpf 460 * will only read from the mbuf (i.e., it won't 461 * try to free it or keep a pointer a to it). 462 */ 463 u_int32_t af = AF_INET6; 464#ifdef HAVE_OLD_BPF 465 struct mbuf m0; 466 467 m0.m_next = m; 468 m0.m_len = 4; 469 m0.m_data = (char *)⁡ 470 471 BPF_MTAP(ifp, &m0); 472#else 473 bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m); 474#endif 475 } 476#endif /*NBPFILTER > 0*/ 477 478 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 479 if (m && m->m_len < sizeof(struct ip)) 480 m = m_pullup(m, sizeof(struct ip)); 481 if (m == NULL) { 482 ifp->if_oerrors++; 483 return ENOBUFS; 484 } 485 ip = mtod(m, struct ip *); 486 487 bzero(ip, sizeof(*ip)); 488 489 bcopy(GET_V4(&((struct sockaddr_in6 *)&ia6->ia_addr)->sin6_addr), 490 &ip->ip_src, sizeof(ip->ip_src)); 491 bcopy(&in4, &ip->ip_dst, sizeof(ip->ip_dst)); 492 ip->ip_p = IPPROTO_IPV6; 493 ip->ip_ttl = ip_stf_ttl; 494 ip->ip_len = m->m_pkthdr.len; /*host order*/ 495 if (ifp->if_flags & IFF_LINK1) 496 ip_ecn_ingress(ECN_ALLOWED, &ip->ip_tos, &tos); 497 else 498 ip_ecn_ingress(ECN_NOCARE, &ip->ip_tos, &tos); 499 500 /* 501 * XXXRW: Locking of sc_ro required. 502 */ 503 dst4 = (struct sockaddr_in *)&sc->sc_ro.ro_dst; 504 if (dst4->sin_family != AF_INET || 505 bcmp(&dst4->sin_addr, &ip->ip_dst, sizeof(ip->ip_dst)) != 0) { 506 /* cache route doesn't match */ 507 dst4->sin_family = AF_INET; 508 dst4->sin_len = sizeof(struct sockaddr_in); 509 bcopy(&ip->ip_dst, &dst4->sin_addr, sizeof(dst4->sin_addr)); 510 if (sc->sc_ro.ro_rt) { 511 RTFREE(sc->sc_ro.ro_rt); 512 sc->sc_ro.ro_rt = NULL; 513 } 514 } 515 516 if (sc->sc_ro.ro_rt == NULL) { 517 rtalloc(&sc->sc_ro); 518 if (sc->sc_ro.ro_rt == NULL) { 519 m_freem(m); 520 ifp->if_oerrors++; 521 return ENETUNREACH; 522 } 523 } 524 525 ifp->if_opackets++; 526 return ip_output(m, NULL, &sc->sc_ro, 0, NULL, NULL); 527} 528 529static int 530isrfc1918addr(in) 531 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 ((ntohl(in->s_addr) & 0xff000000) >> 24 == 10 || 538 (ntohl(in->s_addr) & 0xfff00000) >> 16 == 172 * 256 + 16 || 539 (ntohl(in->s_addr) & 0xffff0000) >> 16 == 192 * 256 + 168) 540 return 1; 541 542 return 0; 543} 544 545static int 546stf_checkaddr4(sc, in, inifp) 547 struct stf_softc *sc; 548 struct in_addr *in; 549 struct ifnet *inifp; /* incoming interface */ 550{ 551 struct in_ifaddr *ia4; 552 553 /* 554 * reject packets with the following address: 555 * 224.0.0.0/4 0.0.0.0/8 127.0.0.0/8 255.0.0.0/8 556 */ 557 if (IN_MULTICAST(ntohl(in->s_addr))) 558 return -1; 559 switch ((ntohl(in->s_addr) & 0xff000000) >> 24) { 560 case 0: case 127: case 255: 561 return -1; 562 } 563 564 /* 565 * reject packets with private address range. 566 * (requirement from RFC3056 section 2 1st paragraph) 567 */ 568 if (isrfc1918addr(in)) 569 return -1; 570 571 /* 572 * reject packets with broadcast 573 */ 574 for (ia4 = TAILQ_FIRST(&in_ifaddrhead); 575 ia4; 576 ia4 = TAILQ_NEXT(ia4, ia_link)) 577 { 578 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0) 579 continue; 580 if (in->s_addr == ia4->ia_broadaddr.sin_addr.s_addr) 581 return -1; 582 } 583 584 /* 585 * perform ingress filter 586 */ 587 if (sc && (sc->sc_if.if_flags & IFF_LINK2) == 0 && inifp) { 588 struct sockaddr_in sin; 589 struct rtentry *rt; 590 591 bzero(&sin, sizeof(sin)); 592 sin.sin_family = AF_INET; 593 sin.sin_len = sizeof(struct sockaddr_in); 594 sin.sin_addr = *in; 595 rt = rtalloc1((struct sockaddr *)&sin, 0, 0UL); 596 if (!rt || rt->rt_ifp != inifp) { 597#if 0 598 log(LOG_WARNING, "%s: packet from 0x%x dropped " 599 "due to ingress filter\n", if_name(&sc->sc_if), 600 (u_int32_t)ntohl(sin.sin_addr.s_addr)); 601#endif 602 if (rt) 603 rtfree(rt); 604 return -1; 605 } 606 rtfree(rt); 607 } 608 609 return 0; 610} 611 612static int 613stf_checkaddr6(sc, in6, inifp) 614 struct stf_softc *sc; 615 struct in6_addr *in6; 616 struct ifnet *inifp; /* incoming interface */ 617{ 618 /* 619 * check 6to4 addresses 620 */ 621 if (IN6_IS_ADDR_6TO4(in6)) { 622 struct in_addr in4; 623 bcopy(GET_V4(in6), &in4, sizeof(in4)); 624 return stf_checkaddr4(sc, &in4, inifp); 625 } 626 627 /* 628 * reject anything that look suspicious. the test is implemented 629 * in ip6_input too, but we check here as well to 630 * (1) reject bad packets earlier, and 631 * (2) to be safe against future ip6_input change. 632 */ 633 if (IN6_IS_ADDR_V4COMPAT(in6) || IN6_IS_ADDR_V4MAPPED(in6)) 634 return -1; 635 636 return 0; 637} 638 639void 640in_stf_input(m, off) 641 struct mbuf *m; 642 int off; 643{ 644 int proto; 645 struct stf_softc *sc; 646 struct ip *ip; 647 struct ip6_hdr *ip6; 648 u_int8_t otos, itos; 649 struct ifnet *ifp; 650 651 proto = mtod(m, struct ip *)->ip_p; 652 653 if (proto != IPPROTO_IPV6) { 654 m_freem(m); 655 return; 656 } 657 658 ip = mtod(m, struct ip *); 659 660 sc = (struct stf_softc *)encap_getarg(m); 661 662 if (sc == NULL || (sc->sc_if.if_flags & IFF_UP) == 0) { 663 m_freem(m); 664 return; 665 } 666 667 ifp = &sc->sc_if; 668 669#ifdef MAC 670 mac_create_mbuf_from_ifnet(ifp, m); 671#endif 672 673 /* 674 * perform sanity check against outer src/dst. 675 * for source, perform ingress filter as well. 676 */ 677 if (stf_checkaddr4(sc, &ip->ip_dst, NULL) < 0 || 678 stf_checkaddr4(sc, &ip->ip_src, m->m_pkthdr.rcvif) < 0) { 679 m_freem(m); 680 return; 681 } 682 683 otos = ip->ip_tos; 684 m_adj(m, off); 685 686 if (m->m_len < sizeof(*ip6)) { 687 m = m_pullup(m, sizeof(*ip6)); 688 if (!m) 689 return; 690 } 691 ip6 = mtod(m, struct ip6_hdr *); 692 693 /* 694 * perform sanity check against inner src/dst. 695 * for source, perform ingress filter as well. 696 */ 697 if (stf_checkaddr6(sc, &ip6->ip6_dst, NULL) < 0 || 698 stf_checkaddr6(sc, &ip6->ip6_src, m->m_pkthdr.rcvif) < 0) { 699 m_freem(m); 700 return; 701 } 702 703 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 704 if ((ifp->if_flags & IFF_LINK1) != 0) 705 ip_ecn_egress(ECN_ALLOWED, &otos, &itos); 706 else 707 ip_ecn_egress(ECN_NOCARE, &otos, &itos); 708 ip6->ip6_flow &= ~htonl(0xff << 20); 709 ip6->ip6_flow |= htonl((u_int32_t)itos << 20); 710 711 m->m_pkthdr.rcvif = ifp; 712 713 if (ifp->if_bpf) { 714 /* 715 * We need to prepend the address family as 716 * a four byte field. Cons up a dummy header 717 * to pacify bpf. This is safe because bpf 718 * will only read from the mbuf (i.e., it won't 719 * try to free it or keep a pointer a to it). 720 */ 721 u_int32_t af = AF_INET6; 722#ifdef HAVE_OLD_BPF 723 struct mbuf m0; 724 725 m0.m_next = m; 726 m0.m_len = 4; 727 m0.m_data = (char *)⁡ 728 729 BPF_MTAP(ifp, &m0); 730#else 731 bpf_mtap2(ifp->if_bpf, &af, sizeof(ah), m); 732#endif 733 } 734 735 /* 736 * Put the packet to the network layer input queue according to the 737 * specified address family. 738 * See net/if_gif.c for possible issues with packet processing 739 * reorder due to extra queueing. 740 */ 741 ifp->if_ipackets++; 742 ifp->if_ibytes += m->m_pkthdr.len; 743 netisr_dispatch(NETISR_IPV6, m); 744} 745 746/* ARGSUSED */ 747static void 748stf_rtrequest(cmd, rt, info) 749 int cmd; 750 struct rtentry *rt; 751 struct rt_addrinfo *info; 752{ 753 RT_LOCK_ASSERT(rt); 754 755 if (rt) 756 rt->rt_rmx.rmx_mtu = IPV6_MMTU; 757} 758 759static int 760stf_ioctl(ifp, cmd, data) 761 struct ifnet *ifp; 762 u_long cmd; 763 caddr_t data; 764{ 765 struct ifaddr *ifa; 766 struct ifreq *ifr; 767 struct sockaddr_in6 *sin6; 768 struct in_addr addr; 769 int error; 770 771 error = 0; 772 switch (cmd) { 773 case SIOCSIFADDR: 774 ifa = (struct ifaddr *)data; 775 if (ifa == NULL || ifa->ifa_addr->sa_family != AF_INET6) { 776 error = EAFNOSUPPORT; 777 break; 778 } 779 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 780 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) { 781 error = EINVAL; 782 break; 783 } 784 bcopy(GET_V4(&sin6->sin6_addr), &addr, sizeof(addr)); 785 if (isrfc1918addr(&addr)) { 786 error = EINVAL; 787 break; 788 } 789 790 ifa->ifa_rtrequest = stf_rtrequest; 791 ifp->if_flags |= IFF_UP; 792 break; 793 794 case SIOCADDMULTI: 795 case SIOCDELMULTI: 796 ifr = (struct ifreq *)data; 797 if (ifr && ifr->ifr_addr.sa_family == AF_INET6) 798 ; 799 else 800 error = EAFNOSUPPORT; 801 break; 802 803 default: 804 error = EINVAL; 805 break; 806 } 807 808 return error; 809} 810