if_stf.c revision 108710
1/* $FreeBSD: head/sys/net/if_stf.c 108710 2003-01-05 14:03:26Z fenner $ */ 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#define GET_V4(x) ((struct in_addr *)(&(x)->s6_addr16[1])) 124 125struct stf_softc { 126 struct ifnet sc_if; /* common area */ 127 union { 128 struct route __sc_ro4; 129 struct route_in6 __sc_ro6; /* just for safety */ 130 } __sc_ro46; 131#define sc_ro __sc_ro46.__sc_ro4 132 const struct encaptab *encap_cookie; 133 LIST_ENTRY(stf_softc) sc_list; /* all stf's are linked */ 134}; 135 136static LIST_HEAD(, stf_softc) stf_softc_list; 137 138static MALLOC_DEFINE(M_STF, STFNAME, "6to4 Tunnel Interface"); 139static int ip_stf_ttl = 40; 140 141extern struct domain inetdomain; 142struct protosw in_stf_protosw = 143{ SOCK_RAW, &inetdomain, IPPROTO_IPV6, PR_ATOMIC|PR_ADDR, 144 in_stf_input, (pr_output_t*)rip_output, 0, rip_ctloutput, 145 0, 146 0, 0, 0, 0, 147 &rip_usrreqs 148}; 149 150static int stfmodevent(module_t, int, void *); 151static int stf_encapcheck(const struct mbuf *, int, int, void *); 152static struct in6_ifaddr *stf_getsrcifa6(struct ifnet *); 153static int stf_output(struct ifnet *, struct mbuf *, struct sockaddr *, 154 struct rtentry *); 155static int isrfc1918addr(struct in_addr *); 156static int stf_checkaddr4(struct stf_softc *, struct in_addr *, 157 struct ifnet *); 158static int stf_checkaddr6(struct stf_softc *, struct in6_addr *, 159 struct ifnet *); 160static void stf_rtrequest(int, struct rtentry *, struct rt_addrinfo *); 161static int stf_ioctl(struct ifnet *, u_long, caddr_t); 162 163int stf_clone_create(struct if_clone *, int); 164void stf_clone_destroy(struct ifnet *); 165 166/* only one clone is currently allowed */ 167struct if_clone stf_cloner = 168 IF_CLONE_INITIALIZER(STFNAME, stf_clone_create, stf_clone_destroy, 0, 0); 169 170int 171stf_clone_create(ifc, unit) 172 struct if_clone *ifc; 173 int unit; 174{ 175 struct stf_softc *sc; 176 177 sc = malloc(sizeof(struct stf_softc), M_STF, M_WAITOK | M_ZERO); 178 sc->sc_if.if_name = STFNAME; 179 sc->sc_if.if_unit = unit; 180 181 sc->encap_cookie = encap_attach_func(AF_INET, IPPROTO_IPV6, 182 stf_encapcheck, &in_stf_protosw, sc); 183 if (sc->encap_cookie == NULL) { 184 printf("%s: attach failed\n", if_name(&sc->sc_if)); 185 free(sc, M_STF); 186 return (ENOMEM); 187 } 188 189 sc->sc_if.if_mtu = IPV6_MMTU; 190 sc->sc_if.if_ioctl = stf_ioctl; 191 sc->sc_if.if_output = stf_output; 192 sc->sc_if.if_type = IFT_STF; 193 sc->sc_if.if_snd.ifq_maxlen = IFQ_MAXLEN; 194 if_attach(&sc->sc_if); 195 bpfattach(&sc->sc_if, DLT_NULL, sizeof(u_int)); 196 LIST_INSERT_HEAD(&stf_softc_list, sc, sc_list); 197 return (0); 198} 199 200void 201stf_clone_destroy(ifp) 202 struct ifnet *ifp; 203{ 204 int err; 205 struct stf_softc *sc = (void *) ifp; 206 207 LIST_REMOVE(sc, sc_list); 208 err = encap_detach(sc->encap_cookie); 209 KASSERT(err == 0, ("Unexpected error detaching encap_cookie")); 210 bpfdetach(ifp); 211 if_detach(ifp); 212 213 free(sc, M_STF); 214} 215 216static int 217stfmodevent(mod, type, data) 218 module_t mod; 219 int type; 220 void *data; 221{ 222 223 switch (type) { 224 case MOD_LOAD: 225 LIST_INIT(&stf_softc_list); 226 if_clone_attach(&stf_cloner); 227 228 break; 229 case MOD_UNLOAD: 230 if_clone_detach(&stf_cloner); 231 232 while (!LIST_EMPTY(&stf_softc_list)) 233 stf_clone_destroy(&LIST_FIRST(&stf_softc_list)->sc_if); 234 break; 235 } 236 237 return (0); 238} 239 240static moduledata_t stf_mod = { 241 "if_stf", 242 stfmodevent, 243 0 244}; 245 246DECLARE_MODULE(if_stf, stf_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 247 248static int 249stf_encapcheck(m, off, proto, arg) 250 const struct mbuf *m; 251 int off; 252 int proto; 253 void *arg; 254{ 255 struct ip ip; 256 struct in6_ifaddr *ia6; 257 struct stf_softc *sc; 258 struct in_addr a, b, mask; 259 260 sc = (struct stf_softc *)arg; 261 if (sc == NULL) 262 return 0; 263 264 if ((sc->sc_if.if_flags & IFF_UP) == 0) 265 return 0; 266 267 /* IFF_LINK0 means "no decapsulation" */ 268 if ((sc->sc_if.if_flags & IFF_LINK0) != 0) 269 return 0; 270 271 if (proto != IPPROTO_IPV6) 272 return 0; 273 274 /* LINTED const cast */ 275 m_copydata((struct mbuf *)(uintptr_t)m, 0, sizeof(ip), (caddr_t)&ip); 276 277 if (ip.ip_v != 4) 278 return 0; 279 280 ia6 = stf_getsrcifa6(&sc->sc_if); 281 if (ia6 == NULL) 282 return 0; 283 284 /* 285 * check if IPv4 dst matches the IPv4 address derived from the 286 * local 6to4 address. 287 * success on: dst = 10.1.1.1, ia6->ia_addr = 2002:0a01:0101:... 288 */ 289 if (bcmp(GET_V4(&ia6->ia_addr.sin6_addr), &ip.ip_dst, 290 sizeof(ip.ip_dst)) != 0) 291 return 0; 292 293 /* 294 * check if IPv4 src matches the IPv4 address derived from the 295 * local 6to4 address masked by prefixmask. 296 * success on: src = 10.1.1.1, ia6->ia_addr = 2002:0a00:.../24 297 * fail on: src = 10.1.1.1, ia6->ia_addr = 2002:0b00:.../24 298 */ 299 bzero(&a, sizeof(a)); 300 bcopy(GET_V4(&ia6->ia_addr.sin6_addr), &a, sizeof(a)); 301 bcopy(GET_V4(&ia6->ia_prefixmask.sin6_addr), &mask, sizeof(mask)); 302 a.s_addr &= mask.s_addr; 303 b = ip.ip_src; 304 b.s_addr &= mask.s_addr; 305 if (a.s_addr != b.s_addr) 306 return 0; 307 308 /* stf interface makes single side match only */ 309 return 32; 310} 311 312static struct in6_ifaddr * 313stf_getsrcifa6(ifp) 314 struct ifnet *ifp; 315{ 316 struct ifaddr *ia; 317 struct in_ifaddr *ia4; 318 struct sockaddr_in6 *sin6; 319 struct in_addr in; 320 321 for (ia = TAILQ_FIRST(&ifp->if_addrlist); 322 ia; 323 ia = TAILQ_NEXT(ia, ifa_list)) 324 { 325 if (ia->ifa_addr == NULL) 326 continue; 327 if (ia->ifa_addr->sa_family != AF_INET6) 328 continue; 329 sin6 = (struct sockaddr_in6 *)ia->ifa_addr; 330 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) 331 continue; 332 333 bcopy(GET_V4(&sin6->sin6_addr), &in, sizeof(in)); 334 LIST_FOREACH(ia4, INADDR_HASH(in.s_addr), ia_hash) 335 if (ia4->ia_addr.sin_addr.s_addr == in.s_addr) 336 break; 337 if (ia4 == NULL) 338 continue; 339 340 return (struct in6_ifaddr *)ia; 341 } 342 343 return NULL; 344} 345 346static int 347stf_output(ifp, m, dst, rt) 348 struct ifnet *ifp; 349 struct mbuf *m; 350 struct sockaddr *dst; 351 struct rtentry *rt; 352{ 353 struct stf_softc *sc; 354 struct sockaddr_in6 *dst6; 355 struct in_addr *in4; 356 struct sockaddr_in *dst4; 357 u_int8_t tos; 358 struct ip *ip; 359 struct ip6_hdr *ip6; 360 struct in6_ifaddr *ia6; 361#ifdef MAC 362 int error; 363 364 error = mac_check_ifnet_transmit(ifp, m); 365 if (error) { 366 m_freem(m); 367 return (error); 368 } 369#endif 370 371 sc = (struct stf_softc*)ifp; 372 dst6 = (struct sockaddr_in6 *)dst; 373 374 /* just in case */ 375 if ((ifp->if_flags & IFF_UP) == 0) { 376 m_freem(m); 377 ifp->if_oerrors++; 378 return ENETDOWN; 379 } 380 381 /* 382 * If we don't have an ip4 address that match my inner ip6 address, 383 * we shouldn't generate output. Without this check, we'll end up 384 * using wrong IPv4 source. 385 */ 386 ia6 = stf_getsrcifa6(ifp); 387 if (ia6 == NULL) { 388 m_freem(m); 389 ifp->if_oerrors++; 390 return ENETDOWN; 391 } 392 393 if (m->m_len < sizeof(*ip6)) { 394 m = m_pullup(m, sizeof(*ip6)); 395 if (!m) { 396 ifp->if_oerrors++; 397 return ENOBUFS; 398 } 399 } 400 ip6 = mtod(m, struct ip6_hdr *); 401 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 402 403 /* 404 * Pickup the right outer dst addr from the list of candidates. 405 * ip6_dst has priority as it may be able to give us shorter IPv4 hops. 406 */ 407 if (IN6_IS_ADDR_6TO4(&ip6->ip6_dst)) 408 in4 = GET_V4(&ip6->ip6_dst); 409 else if (IN6_IS_ADDR_6TO4(&dst6->sin6_addr)) 410 in4 = GET_V4(&dst6->sin6_addr); 411 else { 412 m_freem(m); 413 ifp->if_oerrors++; 414 return ENETUNREACH; 415 } 416 417#if NBPFILTER > 0 418 if (ifp->if_bpf) { 419 /* 420 * We need to prepend the address family as 421 * a four byte field. Cons up a dummy header 422 * to pacify bpf. This is safe because bpf 423 * will only read from the mbuf (i.e., it won't 424 * try to free it or keep a pointer a to it). 425 */ 426 struct mbuf m0; 427 u_int32_t af = AF_INET6; 428 429 m0.m_next = m; 430 m0.m_len = 4; 431 m0.m_data = (char *)⁡ 432 433#ifdef HAVE_OLD_BPF 434 BPF_MTAP(ifp, &m0); 435#else 436 bpf_mtap(ifp->if_bpf, &m0); 437#endif 438 } 439#endif /*NBPFILTER > 0*/ 440 441 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 442 if (m && m->m_len < sizeof(struct ip)) 443 m = m_pullup(m, sizeof(struct ip)); 444 if (m == NULL) { 445 ifp->if_oerrors++; 446 return ENOBUFS; 447 } 448 ip = mtod(m, struct ip *); 449 450 bzero(ip, sizeof(*ip)); 451 452 bcopy(GET_V4(&((struct sockaddr_in6 *)&ia6->ia_addr)->sin6_addr), 453 &ip->ip_src, sizeof(ip->ip_src)); 454 bcopy(in4, &ip->ip_dst, sizeof(ip->ip_dst)); 455 ip->ip_p = IPPROTO_IPV6; 456 ip->ip_ttl = ip_stf_ttl; 457 ip->ip_len = m->m_pkthdr.len; /*host order*/ 458 if (ifp->if_flags & IFF_LINK1) 459 ip_ecn_ingress(ECN_ALLOWED, &ip->ip_tos, &tos); 460 else 461 ip_ecn_ingress(ECN_NOCARE, &ip->ip_tos, &tos); 462 463 dst4 = (struct sockaddr_in *)&sc->sc_ro.ro_dst; 464 if (dst4->sin_family != AF_INET || 465 bcmp(&dst4->sin_addr, &ip->ip_dst, sizeof(ip->ip_dst)) != 0) { 466 /* cache route doesn't match */ 467 dst4->sin_family = AF_INET; 468 dst4->sin_len = sizeof(struct sockaddr_in); 469 bcopy(&ip->ip_dst, &dst4->sin_addr, sizeof(dst4->sin_addr)); 470 if (sc->sc_ro.ro_rt) { 471 RTFREE(sc->sc_ro.ro_rt); 472 sc->sc_ro.ro_rt = NULL; 473 } 474 } 475 476 if (sc->sc_ro.ro_rt == NULL) { 477 rtalloc(&sc->sc_ro); 478 if (sc->sc_ro.ro_rt == NULL) { 479 m_freem(m); 480 ifp->if_oerrors++; 481 return ENETUNREACH; 482 } 483 } 484 485 ifp->if_opackets++; 486 return ip_output(m, NULL, &sc->sc_ro, 0, NULL, NULL); 487} 488 489static int 490isrfc1918addr(in) 491 struct in_addr *in; /* 16-bit aligned */ 492{ 493 u_char *a = (u_char *)in; 494 495 /* 496 * returns 1 if private address range: 497 * 10.0.0.0/8 172.16.0.0/12 192.168.0.0/16 498 */ 499 if (a[0] == 10 || 500 (a[0] == 172 && (a[1] & 0xf0) == 16) || 501 (a[1] == 192 && a[1] == 168)) 502 return 1; 503 504 return 0; 505} 506 507static int 508stf_checkaddr4(sc, in, inifp) 509 struct stf_softc *sc; 510 struct in_addr *in; /* 16-bit aligned */ 511 struct ifnet *inifp; /* incoming interface */ 512{ 513 struct in_ifaddr *ia4; 514 u_char *a = (u_char *)in; 515 516 /* 517 * reject packets with the following address: 518 * 224.0.0.0/4 0.0.0.0/8 127.0.0.0/8 255.0.0.0/8 519 */ 520 if ((a[0] & 0xf0) == 0xe0) 521 return -1; 522 if (a[0] == 0 || a[0] == 127 || a[0] == 255) 523 return -1; 524 525 /* 526 * reject packets with private address range. 527 * (requirement from RFC3056 section 2 1st paragraph) 528 */ 529 if (isrfc1918addr(in)) 530 return -1; 531 532 /* 533 * reject packets with broadcast 534 */ 535 for (ia4 = TAILQ_FIRST(&in_ifaddrhead); 536 ia4; 537 ia4 = TAILQ_NEXT(ia4, ia_link)) 538 { 539 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0) 540 continue; 541 if (bcmp(in, &ia4->ia_broadaddr.sin_addr, sizeof(*in)) == 0) 542 return -1; 543 } 544 545 /* 546 * perform ingress filter 547 */ 548 if (sc && (sc->sc_if.if_flags & IFF_LINK2) == 0 && inifp) { 549 struct sockaddr_in sin; 550 struct rtentry *rt; 551 552 bzero(&sin, sizeof(sin)); 553 sin.sin_family = AF_INET; 554 sin.sin_len = sizeof(struct sockaddr_in); 555 bcopy(in, &sin.sin_addr, sizeof(*in)); 556 rt = rtalloc1((struct sockaddr *)&sin, 0, 0UL); 557 if (!rt || rt->rt_ifp != inifp) { 558#if 0 559 log(LOG_WARNING, "%s: packet from 0x%x dropped " 560 "due to ingress filter\n", if_name(&sc->sc_if), 561 (u_int32_t)ntohl(sin.sin_addr.s_addr)); 562#endif 563 if (rt) 564 rtfree(rt); 565 return -1; 566 } 567 rtfree(rt); 568 } 569 570 return 0; 571} 572 573static int 574stf_checkaddr6(sc, in6, inifp) 575 struct stf_softc *sc; 576 struct in6_addr *in6; 577 struct ifnet *inifp; /* incoming interface */ 578{ 579 /* 580 * check 6to4 addresses 581 */ 582 if (IN6_IS_ADDR_6TO4(in6)) 583 return stf_checkaddr4(sc, GET_V4(in6), inifp); 584 585 /* 586 * reject anything that look suspicious. the test is implemented 587 * in ip6_input too, but we check here as well to 588 * (1) reject bad packets earlier, and 589 * (2) to be safe against future ip6_input change. 590 */ 591 if (IN6_IS_ADDR_V4COMPAT(in6) || IN6_IS_ADDR_V4MAPPED(in6)) 592 return -1; 593 594 return 0; 595} 596 597void 598in_stf_input(m, off) 599 struct mbuf *m; 600 int off; 601{ 602 int proto; 603 struct stf_softc *sc; 604 struct ip *ip; 605 struct ip6_hdr *ip6; 606 u_int8_t otos, itos; 607 int len, isr; 608 struct ifqueue *ifq = NULL; 609 struct ifnet *ifp; 610 611 proto = mtod(m, struct ip *)->ip_p; 612 613 if (proto != IPPROTO_IPV6) { 614 m_freem(m); 615 return; 616 } 617 618 ip = mtod(m, struct ip *); 619 620 sc = (struct stf_softc *)encap_getarg(m); 621 622 if (sc == NULL || (sc->sc_if.if_flags & IFF_UP) == 0) { 623 m_freem(m); 624 return; 625 } 626 627 ifp = &sc->sc_if; 628 629#ifdef MAC 630 mac_create_mbuf_from_ifnet(ifp, m); 631#endif 632 633 /* 634 * perform sanity check against outer src/dst. 635 * for source, perform ingress filter as well. 636 */ 637 if (stf_checkaddr4(sc, &ip->ip_dst, NULL) < 0 || 638 stf_checkaddr4(sc, &ip->ip_src, m->m_pkthdr.rcvif) < 0) { 639 m_freem(m); 640 return; 641 } 642 643 otos = ip->ip_tos; 644 m_adj(m, off); 645 646 if (m->m_len < sizeof(*ip6)) { 647 m = m_pullup(m, sizeof(*ip6)); 648 if (!m) 649 return; 650 } 651 ip6 = mtod(m, struct ip6_hdr *); 652 653 /* 654 * perform sanity check against inner src/dst. 655 * for source, perform ingress filter as well. 656 */ 657 if (stf_checkaddr6(sc, &ip6->ip6_dst, NULL) < 0 || 658 stf_checkaddr6(sc, &ip6->ip6_src, m->m_pkthdr.rcvif) < 0) { 659 m_freem(m); 660 return; 661 } 662 663 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 664 if ((ifp->if_flags & IFF_LINK1) != 0) 665 ip_ecn_egress(ECN_ALLOWED, &otos, &itos); 666 else 667 ip_ecn_egress(ECN_NOCARE, &otos, &itos); 668 ip6->ip6_flow &= ~htonl(0xff << 20); 669 ip6->ip6_flow |= htonl((u_int32_t)itos << 20); 670 671 m->m_pkthdr.rcvif = ifp; 672 673 if (ifp->if_bpf) { 674 /* 675 * We need to prepend the address family as 676 * a four byte field. Cons up a dummy header 677 * to pacify bpf. This is safe because bpf 678 * will only read from the mbuf (i.e., it won't 679 * try to free it or keep a pointer a to it). 680 */ 681 struct mbuf m0; 682 u_int32_t af = AF_INET6; 683 684 m0.m_next = m; 685 m0.m_len = 4; 686 m0.m_data = (char *)⁡ 687 688#ifdef HAVE_OLD_BPF 689 BPF_MTAP(ifp, &m0); 690#else 691 bpf_mtap(ifp->if_bpf, &m0); 692#endif 693 } 694 695 /* 696 * Put the packet to the network layer input queue according to the 697 * specified address family. 698 * See net/if_gif.c for possible issues with packet processing 699 * reorder due to extra queueing. 700 */ 701 ifq = &ip6intrq; 702 isr = NETISR_IPV6; 703 704 len = m->m_pkthdr.len; 705 if (! IF_HANDOFF(ifq, m, NULL)) 706 return; 707 schednetisr(isr); 708 ifp->if_ipackets++; 709 ifp->if_ibytes += len; 710} 711 712/* ARGSUSED */ 713static void 714stf_rtrequest(cmd, rt, info) 715 int cmd; 716 struct rtentry *rt; 717 struct rt_addrinfo *info; 718{ 719 720 if (rt) 721 rt->rt_rmx.rmx_mtu = IPV6_MMTU; 722} 723 724static int 725stf_ioctl(ifp, cmd, data) 726 struct ifnet *ifp; 727 u_long cmd; 728 caddr_t data; 729{ 730 struct ifaddr *ifa; 731 struct ifreq *ifr; 732 struct sockaddr_in6 *sin6; 733 int error; 734 735 error = 0; 736 switch (cmd) { 737 case SIOCSIFADDR: 738 ifa = (struct ifaddr *)data; 739 if (ifa == NULL || ifa->ifa_addr->sa_family != AF_INET6) { 740 error = EAFNOSUPPORT; 741 break; 742 } 743 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 744 if (IN6_IS_ADDR_6TO4(&sin6->sin6_addr) && 745 !isrfc1918addr(GET_V4(&sin6->sin6_addr))) { 746 ifa->ifa_rtrequest = stf_rtrequest; 747 ifp->if_flags |= IFF_UP; 748 } else 749 error = EINVAL; 750 break; 751 752 case SIOCADDMULTI: 753 case SIOCDELMULTI: 754 ifr = (struct ifreq *)data; 755 if (ifr && ifr->ifr_addr.sa_family == AF_INET6) 756 ; 757 else 758 error = EAFNOSUPPORT; 759 break; 760 761 default: 762 error = EINVAL; 763 break; 764 } 765 766 return error; 767} 768