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 80 #include <sys/param.h> 81 #include <sys/systm.h> 82 #include <sys/socket.h> 83 #include <sys/sockio.h> 84 #include <sys/mbuf.h> 85 #include <sys/errno.h> 86 #include <sys/kernel.h> 87 #include <sys/protosw.h> 88 #include <sys/queue.h> 89 #include <machine/cpu.h> 90 91 #include <sys/malloc.h> 92 93 #include <net/if.h> 94 #include <net/route.h> 95 #include <net/netisr.h> 96 #include <net/if_types.h> 97 #include <net/if_stf.h> 98 99 #include <netinet/in.h> 100 #include <netinet/in_systm.h> 101 #include <netinet/ip.h> 102 #include <netinet/ip_var.h> 103 #include <netinet/in_var.h> 104 105 #include <netinet/ip6.h> 106 #include <netinet6/ip6_var.h> 107 #include <netinet6/in6_var.h> 108 #include <netinet/ip_ecn.h> 109 110 #include <netinet/ip_encap.h> 111 112 #include <machine/stdarg.h> 113 114 #include <net/net_osdep.h> 115 116 #include <net/bpf.h> 117 118 #define STFNAME "stf" 119 120 #define IN6_IS_ADDR_6TO4(x) (ntohs((x)->s6_addr16[0]) == 0x2002) 121 #define GET_V4(x) ((struct in_addr *)(&(x)->s6_addr16[1])) 122 123 struct stf_softc { 124 struct ifnet sc_if; /* common area */ 125 union { 126 struct route __sc_ro4; 127 struct route_in6 __sc_ro6; /* just for safety */ 128 } __sc_ro46; 129 #define sc_ro __sc_ro46.__sc_ro4 130 const struct encaptab *encap_cookie; 131 LIST_ENTRY(stf_softc) sc_list; /* all stf's are linked */ 132 }; 133 134 static LIST_HEAD(, stf_softc) stf_softc_list; 135 136 static MALLOC_DEFINE(M_STF, STFNAME, "6to4 Tunnel Interface"); 137 static int ip_stf_ttl = 40; 138 139 extern struct domain inetdomain; 140 struct protosw in_stf_protosw = 141 { SOCK_RAW, &inetdomain, IPPROTO_IPV6, PR_ATOMIC|PR_ADDR, 142 in_stf_input, (pr_output_t*)rip_output, 0, rip_ctloutput, 143 0, 144 0, 0, 0, 0, 145 &rip_usrreqs 146 }; 147 148 static int stfmodevent(module_t, int, void *); 149 static int stf_encapcheck(const struct mbuf *, int, int, void *); 150 static struct in6_ifaddr *stf_getsrcifa6(struct ifnet *); 151 static int stf_output(struct ifnet *, struct mbuf *, struct sockaddr *, 152 struct rtentry *); 153 static int stf_checkaddr4(struct stf_softc *, struct in_addr *, 154 struct ifnet *); 155 static int stf_checkaddr6(struct stf_softc *, struct in6_addr *, 156 struct ifnet *); 157 static void stf_rtrequest(int, struct rtentry *, struct rt_addrinfo *); 158 static int stf_ioctl(struct ifnet *, u_long, caddr_t); 159 160 int stf_clone_create(struct if_clone *, int); 161 void stf_clone_destroy(struct ifnet *); 162 163 /* only one clone is currently allowed */ 164 struct if_clone stf_cloner = 165 IF_CLONE_INITIALIZER(STFNAME, stf_clone_create, stf_clone_destroy, 0, 0); 166 167 int 168 stf_clone_create(ifc, unit) 169 struct if_clone *ifc; 170 int unit; 171 { 172 struct stf_softc *sc; 173 174 sc = malloc(sizeof(struct stf_softc), M_STF, M_WAITOK | M_ZERO); 175 sc->sc_if.if_name = STFNAME; 176 sc->sc_if.if_unit = unit; 177 178 sc->encap_cookie = encap_attach_func(AF_INET, IPPROTO_IPV6, 179 stf_encapcheck, &in_stf_protosw, sc); 180 if (sc->encap_cookie == NULL) { 181 printf("%s: attach failed\n", if_name(&sc->sc_if)); 182 free(sc, M_STF); 183 return (ENOMEM); 184 } 185 186 sc->sc_if.if_mtu = IPV6_MMTU; 187 sc->sc_if.if_ioctl = stf_ioctl; 188 sc->sc_if.if_output = stf_output; 189 sc->sc_if.if_type = IFT_STF; 190 sc->sc_if.if_snd.ifq_maxlen = IFQ_MAXLEN; 191 if_attach(&sc->sc_if); 192 bpfattach(&sc->sc_if, DLT_NULL, sizeof(u_int)); 193 LIST_INSERT_HEAD(&stf_softc_list, sc, sc_list); 194 return (0); 195 } 196 197 void 198 stf_clone_destroy(ifp) 199 struct ifnet *ifp; 200 { 201 int err; 202 struct stf_softc *sc = (void *) ifp; 203 204 LIST_REMOVE(sc, sc_list); 205 err = encap_detach(sc->encap_cookie); 206 KASSERT(err == 0, ("Unexpected error detaching encap_cookie")); 207 bpfdetach(ifp); 208 if_detach(ifp); 209 210 free(sc, M_STF); 211 } 212 213 static int 214 stfmodevent(mod, type, data) 215 module_t mod; 216 int type; 217 void *data; 218 { 219 220 switch (type) { 221 case MOD_LOAD: 222 LIST_INIT(&stf_softc_list); 223 if_clone_attach(&stf_cloner); 224 225 break; 226 case MOD_UNLOAD: 227 if_clone_detach(&stf_cloner); 228 229 while (!LIST_EMPTY(&stf_softc_list)) 230 stf_clone_destroy(&LIST_FIRST(&stf_softc_list)->sc_if); 231 break; 232 } 233 234 return (0); 235 } 236 237 static moduledata_t stf_mod = { 238 "if_stf", 239 stfmodevent, 240 0 241 }; 242 243 DECLARE_MODULE(if_stf, stf_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 244 245 static int 246 stf_encapcheck(m, off, proto, arg) 247 const struct mbuf *m; 248 int off; 249 int proto; 250 void *arg; 251 { 252 struct ip ip; 253 struct in6_ifaddr *ia6; 254 struct stf_softc *sc; 255 struct in_addr a, b; 256 257 sc = (struct stf_softc *)arg; 258 if (sc == NULL) 259 return 0; 260 261 if ((sc->sc_if.if_flags & IFF_UP) == 0) 262 return 0; 263 264 /* IFF_LINK0 means "no decapsulation" */ 265 if ((sc->sc_if.if_flags & IFF_LINK0) != 0) 266 return 0; 267 268 if (proto != IPPROTO_IPV6) 269 return 0; 270 271 /* LINTED const cast */ 272 m_copydata((struct mbuf *)(uintptr_t)m, 0, sizeof(ip), (caddr_t)&ip); 273 274 if (ip.ip_v != 4) 275 return 0; 276 277 ia6 = stf_getsrcifa6(&sc->sc_if); 278 if (ia6 == NULL) 279 return 0; 280 281 /* 282 * check if IPv4 dst matches the IPv4 address derived from the 283 * local 6to4 address. 284 * success on: dst = 10.1.1.1, ia6->ia_addr = 2002:0a01:0101:... 285 */ 286 if (bcmp(GET_V4(&ia6->ia_addr.sin6_addr), &ip.ip_dst, 287 sizeof(ip.ip_dst)) != 0) 288 return 0; 289 290 /* 291 * check if IPv4 src matches the IPv4 address derived from the 292 * local 6to4 address masked by prefixmask. 293 * success on: src = 10.1.1.1, ia6->ia_addr = 2002:0a00:.../24 294 * fail on: src = 10.1.1.1, ia6->ia_addr = 2002:0b00:.../24 295 */ 296 bzero(&a, sizeof(a)); 297 a.s_addr = GET_V4(&ia6->ia_addr.sin6_addr)->s_addr; 298 a.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 299 b = ip.ip_src; 300 b.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 301 if (a.s_addr != b.s_addr) 302 return 0; 303 304 /* stf interface makes single side match only */ 305 return 32; 306 } 307 308 static struct in6_ifaddr * 309 stf_getsrcifa6(ifp) 310 struct ifnet *ifp; 311 { 312 struct ifaddr *ia; 313 struct in_ifaddr *ia4; 314 struct sockaddr_in6 *sin6; 315 struct in_addr in; 316 317 for (ia = TAILQ_FIRST(&ifp->if_addrlist); 318 ia; 319 ia = TAILQ_NEXT(ia, ifa_list)) 320 { 321 if (ia->ifa_addr == NULL) 322 continue; 323 if (ia->ifa_addr->sa_family != AF_INET6) 324 continue; 325 sin6 = (struct sockaddr_in6 *)ia->ifa_addr; 326 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) 327 continue; 328 329 bcopy(GET_V4(&sin6->sin6_addr), &in, sizeof(in)); 330 LIST_FOREACH(ia4, INADDR_HASH(in.s_addr), ia_hash) 331 if (ia4->ia_addr.sin_addr.s_addr == in.s_addr) 332 break; 333 if (ia4 == NULL) 334 continue; 335 336 return (struct in6_ifaddr *)ia; 337 } 338 339 return NULL; 340 } 341 342 static int 343 stf_output(ifp, m, dst, rt) 344 struct ifnet *ifp; 345 struct mbuf *m; 346 struct sockaddr *dst; 347 struct rtentry *rt; 348 { 349 struct stf_softc *sc; 350 struct sockaddr_in6 *dst6; 351 struct in_addr *in4; 352 struct sockaddr_in *dst4; 353 u_int8_t tos; 354 struct ip *ip; 355 struct ip6_hdr *ip6; 356 struct in6_ifaddr *ia6; 357 358 sc = (struct stf_softc*)ifp; 359 dst6 = (struct sockaddr_in6 *)dst; 360 361 /* just in case */ 362 if ((ifp->if_flags & IFF_UP) == 0) { 363 m_freem(m); 364 return ENETDOWN; 365 } 366 367 /* 368 * If we don't have an ip4 address that match my inner ip6 address, 369 * we shouldn't generate output. Without this check, we'll end up 370 * using wrong IPv4 source. 371 */ 372 ia6 = stf_getsrcifa6(ifp); 373 if (ia6 == NULL) { 374 m_freem(m); 375 return ENETDOWN; 376 } 377 378 if (m->m_len < sizeof(*ip6)) { 379 m = m_pullup(m, sizeof(*ip6)); 380 if (!m) 381 return ENOBUFS; 382 } 383 ip6 = mtod(m, struct ip6_hdr *); 384 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 385 386 /* 387 * Pickup the right outer dst addr from the list of candidates. 388 * ip6_dst has priority as it may be able to give us shorter IPv4 hops. 389 */ 390 if (IN6_IS_ADDR_6TO4(&ip6->ip6_dst)) 391 in4 = GET_V4(&ip6->ip6_dst); 392 else if (IN6_IS_ADDR_6TO4(&dst6->sin6_addr)) 393 in4 = GET_V4(&dst6->sin6_addr); 394 else { 395 m_freem(m); 396 return ENETUNREACH; 397 } 398 399 #if NBPFILTER > 0 400 if (ifp->if_bpf) { 401 /* 402 * We need to prepend the address family as 403 * a four byte field. Cons up a dummy header 404 * to pacify bpf. This is safe because bpf 405 * will only read from the mbuf (i.e., it won't 406 * try to free it or keep a pointer a to it). 407 */ 408 struct mbuf m0; 409 u_int32_t af = AF_INET6; 410 411 m0.m_next = m; 412 m0.m_len = 4; 413 m0.m_data = (char *)⁡ 414 415 #ifdef HAVE_OLD_BPF 416 bpf_mtap(ifp, &m0); 417 #else 418 bpf_mtap(ifp->if_bpf, &m0); 419 #endif 420 } 421 #endif /*NBPFILTER > 0*/ 422 423 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 424 if (m && m->m_len < sizeof(struct ip)) 425 m = m_pullup(m, sizeof(struct ip)); 426 if (m == NULL) 427 return ENOBUFS; 428 ip = mtod(m, struct ip *); 429 430 bzero(ip, sizeof(*ip)); 431 432 bcopy(GET_V4(&((struct sockaddr_in6 *)&ia6->ia_addr)->sin6_addr), 433 &ip->ip_src, sizeof(ip->ip_src)); 434 bcopy(in4, &ip->ip_dst, sizeof(ip->ip_dst)); 435 ip->ip_p = IPPROTO_IPV6; 436 ip->ip_ttl = ip_stf_ttl; 437 ip->ip_len = m->m_pkthdr.len; /*host order*/ 438 if (ifp->if_flags & IFF_LINK1) 439 ip_ecn_ingress(ECN_ALLOWED, &ip->ip_tos, &tos); 440 else 441 ip_ecn_ingress(ECN_NOCARE, &ip->ip_tos, &tos); 442 443 dst4 = (struct sockaddr_in *)&sc->sc_ro.ro_dst; 444 if (dst4->sin_family != AF_INET || 445 bcmp(&dst4->sin_addr, &ip->ip_dst, sizeof(ip->ip_dst)) != 0) { 446 /* cache route doesn't match */ 447 dst4->sin_family = AF_INET; 448 dst4->sin_len = sizeof(struct sockaddr_in); 449 bcopy(&ip->ip_dst, &dst4->sin_addr, sizeof(dst4->sin_addr)); 450 if (sc->sc_ro.ro_rt) { 451 RTFREE(sc->sc_ro.ro_rt); 452 sc->sc_ro.ro_rt = NULL; 453 } 454 } 455 456 if (sc->sc_ro.ro_rt == NULL) { 457 rtalloc(&sc->sc_ro); 458 if (sc->sc_ro.ro_rt == NULL) { 459 m_freem(m); 460 return ENETUNREACH; 461 } 462 } 463 464 return ip_output(m, NULL, &sc->sc_ro, 0, NULL); 465 } 466 467 static int 468 stf_checkaddr4(sc, in, inifp) 469 struct stf_softc *sc; 470 struct in_addr *in; 471 struct ifnet *inifp; /* incoming interface */ 472 { 473 struct in_ifaddr *ia4; 474 475 /* 476 * reject packets with the following address: 477 * 224.0.0.0/4 0.0.0.0/8 127.0.0.0/8 255.0.0.0/8 478 */ 479 if (IN_MULTICAST(ntohl(in->s_addr))) 480 return -1; 481 switch ((ntohl(in->s_addr) & 0xff000000) >> 24) { 482 case 0: case 127: case 255: 483 return -1; 484 } 485 486 /* 487 * reject packets with broadcast 488 */ 489 for (ia4 = TAILQ_FIRST(&in_ifaddrhead); 490 ia4; 491 ia4 = TAILQ_NEXT(ia4, ia_link)) 492 { 493 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0) 494 continue; 495 if (in->s_addr == ia4->ia_broadaddr.sin_addr.s_addr) 496 return -1; 497 } 498 499 /* 500 * perform ingress filter 501 */ 502 if (sc && (sc->sc_if.if_flags & IFF_LINK2) == 0 && inifp) { 503 struct sockaddr_in sin; 504 struct rtentry *rt; 505 506 bzero(&sin, sizeof(sin)); 507 sin.sin_family = AF_INET; 508 sin.sin_len = sizeof(struct sockaddr_in); 509 sin.sin_addr = *in; 510 rt = rtalloc1((struct sockaddr *)&sin, 0, 0UL); 511 if (!rt || rt->rt_ifp != inifp) { 512 #if 0 513 log(LOG_WARNING, "%s: packet from 0x%x dropped " 514 "due to ingress filter\n", if_name(&sc->sc_if), 515 (u_int32_t)ntohl(sin.sin_addr.s_addr)); 516 #endif 517 if (rt) 518 rtfree(rt); 519 return -1; 520 } 521 rtfree(rt); 522 } 523 524 return 0; 525 } 526 527 static int 528 stf_checkaddr6(sc, in6, inifp) 529 struct stf_softc *sc; 530 struct in6_addr *in6; 531 struct ifnet *inifp; /* incoming interface */ 532 { 533 /* 534 * check 6to4 addresses 535 */ 536 if (IN6_IS_ADDR_6TO4(in6)) 537 return stf_checkaddr4(sc, GET_V4(in6), inifp); 538 539 /* 540 * reject anything that look suspicious. the test is implemented 541 * in ip6_input too, but we check here as well to 542 * (1) reject bad packets earlier, and 543 * (2) to be safe against future ip6_input change. 544 */ 545 if (IN6_IS_ADDR_V4COMPAT(in6) || IN6_IS_ADDR_V4MAPPED(in6)) 546 return -1; 547 548 return 0; 549 } 550 551 void 552 in_stf_input(m, off) 553 struct mbuf *m; 554 int off; 555 { 556 int proto; 557 struct stf_softc *sc; 558 struct ip *ip; 559 struct ip6_hdr *ip6; 560 u_int8_t otos, itos; 561 int len, isr; 562 struct ifqueue *ifq = NULL; 563 struct ifnet *ifp; 564 565 proto = mtod(m, struct ip *)->ip_p; 566 567 if (proto != IPPROTO_IPV6) { 568 m_freem(m); 569 return; 570 } 571 572 ip = mtod(m, struct ip *); 573 574 sc = (struct stf_softc *)encap_getarg(m); 575 576 if (sc == NULL || (sc->sc_if.if_flags & IFF_UP) == 0) { 577 m_freem(m); 578 return; 579 } 580 581 ifp = &sc->sc_if; 582 583 /* 584 * perform sanity check against outer src/dst. 585 * for source, perform ingress filter as well. 586 */ 587 if (stf_checkaddr4(sc, &ip->ip_dst, NULL) < 0 || 588 stf_checkaddr4(sc, &ip->ip_src, m->m_pkthdr.rcvif) < 0) { 589 m_freem(m); 590 return; 591 } 592 593 otos = ip->ip_tos; 594 m_adj(m, off); 595 596 if (m->m_len < sizeof(*ip6)) { 597 m = m_pullup(m, sizeof(*ip6)); 598 if (!m) 599 return; 600 } 601 ip6 = mtod(m, struct ip6_hdr *); 602 603 /* 604 * perform sanity check against inner src/dst. 605 * for source, perform ingress filter as well. 606 */ 607 if (stf_checkaddr6(sc, &ip6->ip6_dst, NULL) < 0 || 608 stf_checkaddr6(sc, &ip6->ip6_src, m->m_pkthdr.rcvif) < 0) { 609 m_freem(m); 610 return; 611 } 612 613 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 614 if ((ifp->if_flags & IFF_LINK1) != 0) 615 ip_ecn_egress(ECN_ALLOWED, &otos, &itos); 616 else 617 ip_ecn_egress(ECN_NOCARE, &otos, &itos); 618 ip6->ip6_flow &= ~htonl(0xff << 20); 619 ip6->ip6_flow |= htonl((u_int32_t)itos << 20); 620 621 m->m_pkthdr.rcvif = ifp; 622 623 if (ifp->if_bpf) { 624 /* 625 * We need to prepend the address family as 626 * a four byte field. Cons up a dummy header 627 * to pacify bpf. This is safe because bpf 628 * will only read from the mbuf (i.e., it won't 629 * try to free it or keep a pointer a to it). 630 */ 631 struct mbuf m0; 632 u_int32_t af = AF_INET6; 633 634 m0.m_next = m; 635 m0.m_len = 4; 636 m0.m_data = (char *)⁡ 637 638 #ifdef HAVE_OLD_BPF 639 bpf_mtap(ifp, &m0); 640 #else 641 bpf_mtap(ifp->if_bpf, &m0); 642 #endif 643 } 644 645 /* 646 * Put the packet to the network layer input queue according to the 647 * specified address family. 648 * See net/if_gif.c for possible issues with packet processing 649 * reorder due to extra queueing. 650 */ 651 ifq = &ip6intrq; 652 isr = NETISR_IPV6; 653 654 len = m->m_pkthdr.len; 655 if (! IF_HANDOFF(ifq, m, NULL)) 656 return; 657 schednetisr(isr); 658 ifp->if_ipackets++; 659 ifp->if_ibytes += len; 660 } 661 662 /* ARGSUSED */ 663 static void 664 stf_rtrequest(cmd, rt, info) 665 int cmd; 666 struct rtentry *rt; 667 struct rt_addrinfo *info; 668 { 669 670 if (rt) 671 rt->rt_rmx.rmx_mtu = IPV6_MMTU; 672 } 673 674 static int 675 stf_ioctl(ifp, cmd, data) 676 struct ifnet *ifp; 677 u_long cmd; 678 caddr_t data; 679 { 680 struct ifaddr *ifa; 681 struct ifreq *ifr; 682 struct sockaddr_in6 *sin6; 683 int error; 684 685 error = 0; 686 switch (cmd) { 687 case SIOCSIFADDR: 688 ifa = (struct ifaddr *)data; 689 if (ifa == NULL || ifa->ifa_addr->sa_family != AF_INET6) { 690 error = EAFNOSUPPORT; 691 break; 692 } 693 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 694 if (IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) { 695 ifa->ifa_rtrequest = stf_rtrequest; 696 ifp->if_flags |= IFF_UP; 697 } else 698 error = EINVAL; 699 break; 700 701 case SIOCADDMULTI: 702 case SIOCDELMULTI: 703 ifr = (struct ifreq *)data; 704 if (ifr && ifr->ifr_addr.sa_family == AF_INET6) 705 ; 706 else 707 error = EAFNOSUPPORT; 708 break; 709 710 default: 711 error = EINVAL; 712 break; 713 } 714 715 return error; 716 } 717