1 /* $FreeBSD$ */ 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])) 124 125 struct 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 }; 135 136 static LIST_HEAD(, stf_softc) stf_softc_list; 137 138 static MALLOC_DEFINE(M_STF, STFNAME, "6to4 Tunnel Interface"); 139 static int ip_stf_ttl = 40; 140 141 extern struct domain inetdomain; 142 struct 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 }; 149 150 static int stfmodevent(module_t, int, void *); 151 static int stf_encapcheck(const struct mbuf *, int, int, void *); 152 static struct in6_ifaddr *stf_getsrcifa6(struct ifnet *); 153 static int stf_output(struct ifnet *, struct mbuf *, struct sockaddr *, 154 struct rtentry *); 155 static int isrfc1918addr(struct in_addr *); 156 static int stf_checkaddr4(struct stf_softc *, struct in_addr *, 157 struct ifnet *); 158 static int stf_checkaddr6(struct stf_softc *, struct in6_addr *, 159 struct ifnet *); 160 static void stf_rtrequest(int, struct rtentry *, struct rt_addrinfo *); 161 static int stf_ioctl(struct ifnet *, u_long, caddr_t); 162 163 int stf_clone_create(struct if_clone *, int); 164 void stf_clone_destroy(struct ifnet *); 165 166 /* only one clone is currently allowed */ 167 struct if_clone stf_cloner = 168 IF_CLONE_INITIALIZER(STFNAME, stf_clone_create, stf_clone_destroy, 0, 0); 169 170 int 171 stf_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 } 199 200 void 201 stf_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 } 215 216 static int 217 stfmodevent(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 } 239 240 static moduledata_t stf_mod = { 241 "if_stf", 242 stfmodevent, 243 0 244 }; 245 246 DECLARE_MODULE(if_stf, stf_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 247 248 static int 249 stf_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; 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 a.s_addr = GET_V4(&ia6->ia_addr.sin6_addr)->s_addr; 301 a.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 302 b = ip.ip_src; 303 b.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 304 if (a.s_addr != b.s_addr) 305 return 0; 306 307 /* stf interface makes single side match only */ 308 return 32; 309 } 310 311 static struct in6_ifaddr * 312 stf_getsrcifa6(ifp) 313 struct ifnet *ifp; 314 { 315 struct ifaddr *ia; 316 struct in_ifaddr *ia4; 317 struct sockaddr_in6 *sin6; 318 struct in_addr in; 319 320 for (ia = TAILQ_FIRST(&ifp->if_addrlist); 321 ia; 322 ia = TAILQ_NEXT(ia, ifa_list)) 323 { 324 if (ia->ifa_addr == NULL) 325 continue; 326 if (ia->ifa_addr->sa_family != AF_INET6) 327 continue; 328 sin6 = (struct sockaddr_in6 *)ia->ifa_addr; 329 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) 330 continue; 331 332 bcopy(GET_V4(&sin6->sin6_addr), &in, sizeof(in)); 333 LIST_FOREACH(ia4, INADDR_HASH(in.s_addr), ia_hash) 334 if (ia4->ia_addr.sin_addr.s_addr == in.s_addr) 335 break; 336 if (ia4 == NULL) 337 continue; 338 339 return (struct in6_ifaddr *)ia; 340 } 341 342 return NULL; 343 } 344 345 static int 346 stf_output(ifp, m, dst, rt) 347 struct ifnet *ifp; 348 struct mbuf *m; 349 struct sockaddr *dst; 350 struct rtentry *rt; 351 { 352 struct stf_softc *sc; 353 struct sockaddr_in6 *dst6; 354 struct in_addr *in4; 355 struct sockaddr_in *dst4; 356 u_int8_t tos; 357 struct ip *ip; 358 struct ip6_hdr *ip6; 359 struct in6_ifaddr *ia6; 360 #ifdef MAC 361 int error; 362 363 error = mac_check_ifnet_transmit(ifp, m); 364 if (error) { 365 m_freem(m); 366 return (error); 367 } 368 #endif 369 370 sc = (struct stf_softc*)ifp; 371 dst6 = (struct sockaddr_in6 *)dst; 372 373 /* just in case */ 374 if ((ifp->if_flags & IFF_UP) == 0) { 375 m_freem(m); 376 ifp->if_oerrors++; 377 return ENETDOWN; 378 } 379 380 /* 381 * If we don't have an ip4 address that match my inner ip6 address, 382 * we shouldn't generate output. Without this check, we'll end up 383 * using wrong IPv4 source. 384 */ 385 ia6 = stf_getsrcifa6(ifp); 386 if (ia6 == NULL) { 387 m_freem(m); 388 ifp->if_oerrors++; 389 return ENETDOWN; 390 } 391 392 if (m->m_len < sizeof(*ip6)) { 393 m = m_pullup(m, sizeof(*ip6)); 394 if (!m) { 395 ifp->if_oerrors++; 396 return ENOBUFS; 397 } 398 } 399 ip6 = mtod(m, struct ip6_hdr *); 400 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 401 402 /* 403 * Pickup the right outer dst addr from the list of candidates. 404 * ip6_dst has priority as it may be able to give us shorter IPv4 hops. 405 */ 406 if (IN6_IS_ADDR_6TO4(&ip6->ip6_dst)) 407 in4 = GET_V4(&ip6->ip6_dst); 408 else if (IN6_IS_ADDR_6TO4(&dst6->sin6_addr)) 409 in4 = GET_V4(&dst6->sin6_addr); 410 else { 411 m_freem(m); 412 ifp->if_oerrors++; 413 return ENETUNREACH; 414 } 415 416 #if NBPFILTER > 0 417 if (ifp->if_bpf) { 418 /* 419 * We need to prepend the address family as 420 * a four byte field. Cons up a dummy header 421 * to pacify bpf. This is safe because bpf 422 * will only read from the mbuf (i.e., it won't 423 * try to free it or keep a pointer a to it). 424 */ 425 struct mbuf m0; 426 u_int32_t af = AF_INET6; 427 428 m0.m_next = m; 429 m0.m_len = 4; 430 m0.m_data = (char *)⁡ 431 432 #ifdef HAVE_OLD_BPF 433 bpf_mtap(ifp, &m0); 434 #else 435 bpf_mtap(ifp->if_bpf, &m0); 436 #endif 437 } 438 #endif /*NBPFILTER > 0*/ 439 440 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 441 if (m && m->m_len < sizeof(struct ip)) 442 m = m_pullup(m, sizeof(struct ip)); 443 if (m == NULL) { 444 ifp->if_oerrors++; 445 return ENOBUFS; 446 } 447 ip = mtod(m, struct ip *); 448 449 bzero(ip, sizeof(*ip)); 450 451 bcopy(GET_V4(&((struct sockaddr_in6 *)&ia6->ia_addr)->sin6_addr), 452 &ip->ip_src, sizeof(ip->ip_src)); 453 bcopy(in4, &ip->ip_dst, sizeof(ip->ip_dst)); 454 ip->ip_p = IPPROTO_IPV6; 455 ip->ip_ttl = ip_stf_ttl; 456 ip->ip_len = m->m_pkthdr.len; /*host order*/ 457 if (ifp->if_flags & IFF_LINK1) 458 ip_ecn_ingress(ECN_ALLOWED, &ip->ip_tos, &tos); 459 else 460 ip_ecn_ingress(ECN_NOCARE, &ip->ip_tos, &tos); 461 462 dst4 = (struct sockaddr_in *)&sc->sc_ro.ro_dst; 463 if (dst4->sin_family != AF_INET || 464 bcmp(&dst4->sin_addr, &ip->ip_dst, sizeof(ip->ip_dst)) != 0) { 465 /* cache route doesn't match */ 466 dst4->sin_family = AF_INET; 467 dst4->sin_len = sizeof(struct sockaddr_in); 468 bcopy(&ip->ip_dst, &dst4->sin_addr, sizeof(dst4->sin_addr)); 469 if (sc->sc_ro.ro_rt) { 470 RTFREE(sc->sc_ro.ro_rt); 471 sc->sc_ro.ro_rt = NULL; 472 } 473 } 474 475 if (sc->sc_ro.ro_rt == NULL) { 476 rtalloc(&sc->sc_ro); 477 if (sc->sc_ro.ro_rt == NULL) { 478 m_freem(m); 479 ifp->if_oerrors++; 480 return ENETUNREACH; 481 } 482 } 483 484 ifp->if_opackets++; 485 return ip_output(m, NULL, &sc->sc_ro, 0, NULL, NULL); 486 } 487 488 static int 489 isrfc1918addr(in) 490 struct in_addr *in; 491 { 492 /* 493 * returns 1 if private address range: 494 * 10.0.0.0/8 172.16.0.0/12 192.168.0.0/16 495 */ 496 if ((ntohl(in->s_addr) & 0xff000000) >> 24 == 10 || 497 (ntohl(in->s_addr) & 0xfff00000) >> 16 == 172 * 256 + 16 || 498 (ntohl(in->s_addr) & 0xffff0000) >> 16 == 192 * 256 + 168) 499 return 1; 500 501 return 0; 502 } 503 504 static int 505 stf_checkaddr4(sc, in, inifp) 506 struct stf_softc *sc; 507 struct in_addr *in; 508 struct ifnet *inifp; /* incoming interface */ 509 { 510 struct in_ifaddr *ia4; 511 512 /* 513 * reject packets with the following address: 514 * 224.0.0.0/4 0.0.0.0/8 127.0.0.0/8 255.0.0.0/8 515 */ 516 if (IN_MULTICAST(ntohl(in->s_addr))) 517 return -1; 518 switch ((ntohl(in->s_addr) & 0xff000000) >> 24) { 519 case 0: case 127: case 255: 520 return -1; 521 } 522 523 /* 524 * reject packets with private address range. 525 * (requirement from RFC3056 section 2 1st paragraph) 526 */ 527 if (isrfc1918addr(in)) 528 return -1; 529 530 /* 531 * reject packets with broadcast 532 */ 533 for (ia4 = TAILQ_FIRST(&in_ifaddrhead); 534 ia4; 535 ia4 = TAILQ_NEXT(ia4, ia_link)) 536 { 537 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0) 538 continue; 539 if (in->s_addr == ia4->ia_broadaddr.sin_addr.s_addr) 540 return -1; 541 } 542 543 /* 544 * perform ingress filter 545 */ 546 if (sc && (sc->sc_if.if_flags & IFF_LINK2) == 0 && inifp) { 547 struct sockaddr_in sin; 548 struct rtentry *rt; 549 550 bzero(&sin, sizeof(sin)); 551 sin.sin_family = AF_INET; 552 sin.sin_len = sizeof(struct sockaddr_in); 553 sin.sin_addr = *in; 554 rt = rtalloc1((struct sockaddr *)&sin, 0, 0UL); 555 if (!rt || rt->rt_ifp != inifp) { 556 #if 0 557 log(LOG_WARNING, "%s: packet from 0x%x dropped " 558 "due to ingress filter\n", if_name(&sc->sc_if), 559 (u_int32_t)ntohl(sin.sin_addr.s_addr)); 560 #endif 561 if (rt) 562 rtfree(rt); 563 return -1; 564 } 565 rtfree(rt); 566 } 567 568 return 0; 569 } 570 571 static int 572 stf_checkaddr6(sc, in6, inifp) 573 struct stf_softc *sc; 574 struct in6_addr *in6; 575 struct ifnet *inifp; /* incoming interface */ 576 { 577 /* 578 * check 6to4 addresses 579 */ 580 if (IN6_IS_ADDR_6TO4(in6)) 581 return stf_checkaddr4(sc, GET_V4(in6), inifp); 582 583 /* 584 * reject anything that look suspicious. the test is implemented 585 * in ip6_input too, but we check here as well to 586 * (1) reject bad packets earlier, and 587 * (2) to be safe against future ip6_input change. 588 */ 589 if (IN6_IS_ADDR_V4COMPAT(in6) || IN6_IS_ADDR_V4MAPPED(in6)) 590 return -1; 591 592 return 0; 593 } 594 595 void 596 in_stf_input(m, off) 597 struct mbuf *m; 598 int off; 599 { 600 int proto; 601 struct stf_softc *sc; 602 struct ip *ip; 603 struct ip6_hdr *ip6; 604 u_int8_t otos, itos; 605 int len, isr; 606 struct ifqueue *ifq = NULL; 607 struct ifnet *ifp; 608 609 proto = mtod(m, struct ip *)->ip_p; 610 611 if (proto != IPPROTO_IPV6) { 612 m_freem(m); 613 return; 614 } 615 616 ip = mtod(m, struct ip *); 617 618 sc = (struct stf_softc *)encap_getarg(m); 619 620 if (sc == NULL || (sc->sc_if.if_flags & IFF_UP) == 0) { 621 m_freem(m); 622 return; 623 } 624 625 ifp = &sc->sc_if; 626 627 #ifdef MAC 628 mac_create_mbuf_from_ifnet(ifp, m); 629 #endif 630 631 /* 632 * perform sanity check against outer src/dst. 633 * for source, perform ingress filter as well. 634 */ 635 if (stf_checkaddr4(sc, &ip->ip_dst, NULL) < 0 || 636 stf_checkaddr4(sc, &ip->ip_src, m->m_pkthdr.rcvif) < 0) { 637 m_freem(m); 638 return; 639 } 640 641 otos = ip->ip_tos; 642 m_adj(m, off); 643 644 if (m->m_len < sizeof(*ip6)) { 645 m = m_pullup(m, sizeof(*ip6)); 646 if (!m) 647 return; 648 } 649 ip6 = mtod(m, struct ip6_hdr *); 650 651 /* 652 * perform sanity check against inner src/dst. 653 * for source, perform ingress filter as well. 654 */ 655 if (stf_checkaddr6(sc, &ip6->ip6_dst, NULL) < 0 || 656 stf_checkaddr6(sc, &ip6->ip6_src, m->m_pkthdr.rcvif) < 0) { 657 m_freem(m); 658 return; 659 } 660 661 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 662 if ((ifp->if_flags & IFF_LINK1) != 0) 663 ip_ecn_egress(ECN_ALLOWED, &otos, &itos); 664 else 665 ip_ecn_egress(ECN_NOCARE, &otos, &itos); 666 ip6->ip6_flow &= ~htonl(0xff << 20); 667 ip6->ip6_flow |= htonl((u_int32_t)itos << 20); 668 669 m->m_pkthdr.rcvif = ifp; 670 671 if (ifp->if_bpf) { 672 /* 673 * We need to prepend the address family as 674 * a four byte field. Cons up a dummy header 675 * to pacify bpf. This is safe because bpf 676 * will only read from the mbuf (i.e., it won't 677 * try to free it or keep a pointer a to it). 678 */ 679 struct mbuf m0; 680 u_int32_t af = AF_INET6; 681 682 m0.m_next = m; 683 m0.m_len = 4; 684 m0.m_data = (char *)⁡ 685 686 #ifdef HAVE_OLD_BPF 687 bpf_mtap(ifp, &m0); 688 #else 689 bpf_mtap(ifp->if_bpf, &m0); 690 #endif 691 } 692 693 /* 694 * Put the packet to the network layer input queue according to the 695 * specified address family. 696 * See net/if_gif.c for possible issues with packet processing 697 * reorder due to extra queueing. 698 */ 699 ifq = &ip6intrq; 700 isr = NETISR_IPV6; 701 702 len = m->m_pkthdr.len; 703 if (! IF_HANDOFF(ifq, m, NULL)) 704 return; 705 schednetisr(isr); 706 ifp->if_ipackets++; 707 ifp->if_ibytes += len; 708 } 709 710 /* ARGSUSED */ 711 static void 712 stf_rtrequest(cmd, rt, info) 713 int cmd; 714 struct rtentry *rt; 715 struct rt_addrinfo *info; 716 { 717 718 if (rt) 719 rt->rt_rmx.rmx_mtu = IPV6_MMTU; 720 } 721 722 static int 723 stf_ioctl(ifp, cmd, data) 724 struct ifnet *ifp; 725 u_long cmd; 726 caddr_t data; 727 { 728 struct ifaddr *ifa; 729 struct ifreq *ifr; 730 struct sockaddr_in6 *sin6; 731 int error; 732 733 error = 0; 734 switch (cmd) { 735 case SIOCSIFADDR: 736 ifa = (struct ifaddr *)data; 737 if (ifa == NULL || ifa->ifa_addr->sa_family != AF_INET6) { 738 error = EAFNOSUPPORT; 739 break; 740 } 741 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 742 if (IN6_IS_ADDR_6TO4(&sin6->sin6_addr) && 743 !isrfc1918addr(GET_V4(&sin6->sin6_addr))) { 744 ifa->ifa_rtrequest = stf_rtrequest; 745 ifp->if_flags |= IFF_UP; 746 } else 747 error = EINVAL; 748 break; 749 750 case SIOCADDMULTI: 751 case SIOCDELMULTI: 752 ifr = (struct ifreq *)data; 753 if (ifr && ifr->ifr_addr.sa_family == AF_INET6) 754 ; 755 else 756 error = EAFNOSUPPORT; 757 break; 758 759 default: 760 error = EINVAL; 761 break; 762 } 763 764 return error; 765 } 766