1 /* $FreeBSD: src/sys/net/if_stf.c,v 1.1.2.11 2003/01/23 21:06:44 sam Exp $ */ 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/protosw.h> 87 #include <sys/kernel.h> 88 #include <machine/cpu.h> 89 90 #include <sys/malloc.h> 91 92 #include <net/if.h> 93 #include <net/route.h> 94 #include <net/netisr.h> 95 #include <net/if_types.h> 96 #include <net/if_stf.h> 97 98 #include <netinet/in.h> 99 #include <netinet/in_systm.h> 100 #include <netinet/ip.h> 101 #include <netinet/ipprotosw.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 IN6_IS_ADDR_6TO4(x) (ntohs((x)->s6_addr16[0]) == 0x2002) 119 #define GET_V4(x) ((struct in_addr *)(&(x)->s6_addr16[1])) 120 121 struct stf_softc { 122 struct ifnet sc_if; /* common area */ 123 union { 124 struct route __sc_ro4; 125 struct route_in6 __sc_ro6; /* just for safety */ 126 } __sc_ro46; 127 #define sc_ro __sc_ro46.__sc_ro4 128 const struct encaptab *encap_cookie; 129 }; 130 131 static struct stf_softc *stf; 132 133 static MALLOC_DEFINE(M_STF, "stf", "6to4 Tunnel Interface"); 134 static int ip_stf_ttl = 40; 135 136 extern struct domain inetdomain; 137 struct ipprotosw in_stf_protosw = 138 { SOCK_RAW, &inetdomain, IPPROTO_IPV6, PR_ATOMIC|PR_ADDR, 139 in_stf_input, rip_output, 0, rip_ctloutput, 140 0, 141 0, 0, 0, 0, 142 &rip_usrreqs 143 }; 144 145 static int stfmodevent __P((module_t, int, void *)); 146 static int stf_encapcheck __P((const struct mbuf *, int, int, void *)); 147 static struct in6_ifaddr *stf_getsrcifa6 __P((struct ifnet *)); 148 static int stf_output __P((struct ifnet *, struct mbuf *, struct sockaddr *, 149 struct rtentry *)); 150 static int stf_checkaddr4 __P((struct stf_softc *, struct in_addr *, 151 struct ifnet *)); 152 static int stf_checkaddr6 __P((struct stf_softc *, struct in6_addr *, 153 struct ifnet *)); 154 static void stf_rtrequest __P((int, struct rtentry *, struct rt_addrinfo *)); 155 static int stf_ioctl __P((struct ifnet *, u_long, caddr_t)); 156 157 static int 158 stfmodevent(mod, type, data) 159 module_t mod; 160 int type; 161 void *data; 162 { 163 struct stf_softc *sc; 164 int err; 165 const struct encaptab *p; 166 167 switch (type) { 168 case MOD_LOAD: 169 stf = malloc(sizeof(struct stf_softc), M_STF, M_WAITOK); 170 bzero(stf, sizeof(struct stf_softc)); 171 sc = stf; 172 173 bzero(sc, sizeof(*sc)); 174 sc->sc_if.if_name = "stf"; 175 sc->sc_if.if_unit = 0; 176 177 p = encap_attach_func(AF_INET, IPPROTO_IPV6, stf_encapcheck, 178 &in_stf_protosw, sc); 179 if (p == NULL) { 180 printf("%s: attach failed\n", if_name(&sc->sc_if)); 181 return (ENOMEM); 182 } 183 sc->encap_cookie = p; 184 185 sc->sc_if.if_mtu = IPV6_MMTU; 186 sc->sc_if.if_flags = 0; 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 #if 0 191 /* turn off ingress filter */ 192 sc->sc_if.if_flags |= IFF_LINK2; 193 #endif 194 sc->sc_if.if_snd.ifq_maxlen = IFQ_MAXLEN; 195 if_attach(&sc->sc_if); 196 #ifdef HAVE_OLD_BPF 197 bpfattach(&sc->sc_if, DLT_NULL, sizeof(u_int)); 198 #else 199 bpfattach(&sc->sc_if.if_bpf, &sc->sc_if, DLT_NULL, sizeof(u_int)); 200 #endif 201 break; 202 case MOD_UNLOAD: 203 sc = stf; 204 bpfdetach(&sc->sc_if); 205 if_detach(&sc->sc_if); 206 err = encap_detach(sc->encap_cookie); 207 KASSERT(err == 0, ("Unexpected error detaching encap_cookie")); 208 free(sc, M_STF); 209 break; 210 } 211 212 return (0); 213 } 214 215 static moduledata_t stf_mod = { 216 "if_stf", 217 stfmodevent, 218 0 219 }; 220 221 DECLARE_MODULE(if_stf, stf_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 222 223 static int 224 stf_encapcheck(m, off, proto, arg) 225 const struct mbuf *m; 226 int off; 227 int proto; 228 void *arg; 229 { 230 struct ip ip; 231 struct in6_ifaddr *ia6; 232 struct stf_softc *sc; 233 struct in_addr a, b; 234 235 sc = (struct stf_softc *)arg; 236 if (sc == NULL) 237 return 0; 238 239 if ((sc->sc_if.if_flags & IFF_UP) == 0) 240 return 0; 241 242 /* IFF_LINK0 means "no decapsulation" */ 243 if ((sc->sc_if.if_flags & IFF_LINK0) != 0) 244 return 0; 245 246 if (proto != IPPROTO_IPV6) 247 return 0; 248 249 /* LINTED const cast */ 250 m_copydata((struct mbuf *)m, 0, sizeof(ip), (caddr_t)&ip); 251 252 if (ip.ip_v != 4) 253 return 0; 254 255 ia6 = stf_getsrcifa6(&sc->sc_if); 256 if (ia6 == NULL) 257 return 0; 258 259 /* 260 * check if IPv4 dst matches the IPv4 address derived from the 261 * local 6to4 address. 262 * success on: dst = 10.1.1.1, ia6->ia_addr = 2002:0a01:0101:... 263 */ 264 if (bcmp(GET_V4(&ia6->ia_addr.sin6_addr), &ip.ip_dst, 265 sizeof(ip.ip_dst)) != 0) 266 return 0; 267 268 /* 269 * check if IPv4 src matches the IPv4 address derived from the 270 * local 6to4 address masked by prefixmask. 271 * success on: src = 10.1.1.1, ia6->ia_addr = 2002:0a00:.../24 272 * fail on: src = 10.1.1.1, ia6->ia_addr = 2002:0b00:.../24 273 */ 274 bzero(&a, sizeof(a)); 275 a.s_addr = GET_V4(&ia6->ia_addr.sin6_addr)->s_addr; 276 a.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 277 b = ip.ip_src; 278 b.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 279 if (a.s_addr != b.s_addr) 280 return 0; 281 282 /* stf interface makes single side match only */ 283 return 32; 284 } 285 286 static struct in6_ifaddr * 287 stf_getsrcifa6(ifp) 288 struct ifnet *ifp; 289 { 290 struct ifaddr *ia; 291 struct in_ifaddr *ia4; 292 struct sockaddr_in6 *sin6; 293 struct in_addr in; 294 295 TAILQ_FOREACH(ia, &ifp->if_addrlist, ifa_list) { 296 if (ia->ifa_addr == NULL) 297 continue; 298 if (ia->ifa_addr->sa_family != AF_INET6) 299 continue; 300 sin6 = (struct sockaddr_in6 *)ia->ifa_addr; 301 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) 302 continue; 303 304 bcopy(GET_V4(&sin6->sin6_addr), &in, sizeof(in)); 305 LIST_FOREACH(ia4, INADDR_HASH(in.s_addr), ia_hash) 306 if (ia4->ia_addr.sin_addr.s_addr == in.s_addr) 307 break; 308 if (ia4 == NULL) 309 continue; 310 311 return (struct in6_ifaddr *)ia; 312 } 313 314 return NULL; 315 } 316 317 static int 318 stf_output(ifp, m, dst, rt) 319 struct ifnet *ifp; 320 struct mbuf *m; 321 struct sockaddr *dst; 322 struct rtentry *rt; 323 { 324 struct stf_softc *sc; 325 struct sockaddr_in6 *dst6; 326 struct in_addr *in4; 327 struct sockaddr_in *dst4; 328 u_int8_t tos; 329 struct ip *ip; 330 struct ip6_hdr *ip6; 331 struct in6_ifaddr *ia6; 332 333 sc = (struct stf_softc*)ifp; 334 dst6 = (struct sockaddr_in6 *)dst; 335 336 /* just in case */ 337 if ((ifp->if_flags & IFF_UP) == 0) { 338 m_freem(m); 339 return ENETDOWN; 340 } 341 342 /* 343 * If we don't have an ip4 address that match my inner ip6 address, 344 * we shouldn't generate output. Without this check, we'll end up 345 * using wrong IPv4 source. 346 */ 347 ia6 = stf_getsrcifa6(ifp); 348 if (ia6 == NULL) { 349 m_freem(m); 350 return ENETDOWN; 351 } 352 353 if (m->m_len < sizeof(*ip6)) { 354 m = m_pullup(m, sizeof(*ip6)); 355 if (!m) 356 return ENOBUFS; 357 } 358 ip6 = mtod(m, struct ip6_hdr *); 359 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 360 361 /* 362 * Pickup the right outer dst addr from the list of candidates. 363 * ip6_dst has priority as it may be able to give us shorter IPv4 hops. 364 */ 365 if (IN6_IS_ADDR_6TO4(&ip6->ip6_dst)) 366 in4 = GET_V4(&ip6->ip6_dst); 367 else if (IN6_IS_ADDR_6TO4(&dst6->sin6_addr)) 368 in4 = GET_V4(&dst6->sin6_addr); 369 else { 370 m_freem(m); 371 return ENETUNREACH; 372 } 373 374 #if NBPFILTER > 0 375 if (ifp->if_bpf) { 376 /* 377 * We need to prepend the address family as 378 * a four byte field. Cons up a dummy header 379 * to pacify bpf. This is safe because bpf 380 * will only read from the mbuf (i.e., it won't 381 * try to free it or keep a pointer a to it). 382 */ 383 struct mbuf m0; 384 u_int32_t af = AF_INET6; 385 386 m0.m_next = m; 387 m0.m_len = 4; 388 m0.m_data = (char *)⁡ 389 390 #ifdef HAVE_OLD_BPF 391 bpf_mtap(ifp, &m0); 392 #else 393 bpf_mtap(ifp->if_bpf, &m0); 394 #endif 395 } 396 #endif /*NBPFILTER > 0*/ 397 398 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 399 if (m && m->m_len < sizeof(struct ip)) 400 m = m_pullup(m, sizeof(struct ip)); 401 if (m == NULL) 402 return ENOBUFS; 403 ip = mtod(m, struct ip *); 404 405 bzero(ip, sizeof(*ip)); 406 407 bcopy(GET_V4(&((struct sockaddr_in6 *)&ia6->ia_addr)->sin6_addr), 408 &ip->ip_src, sizeof(ip->ip_src)); 409 bcopy(in4, &ip->ip_dst, sizeof(ip->ip_dst)); 410 ip->ip_p = IPPROTO_IPV6; 411 ip->ip_ttl = ip_stf_ttl; 412 ip->ip_len = m->m_pkthdr.len; /*host order*/ 413 if (ifp->if_flags & IFF_LINK1) 414 ip_ecn_ingress(ECN_ALLOWED, &ip->ip_tos, &tos); 415 else 416 ip_ecn_ingress(ECN_NOCARE, &ip->ip_tos, &tos); 417 418 dst4 = (struct sockaddr_in *)&sc->sc_ro.ro_dst; 419 if (dst4->sin_family != AF_INET || 420 bcmp(&dst4->sin_addr, &ip->ip_dst, sizeof(ip->ip_dst)) != 0) { 421 /* cache route doesn't match */ 422 dst4->sin_family = AF_INET; 423 dst4->sin_len = sizeof(struct sockaddr_in); 424 bcopy(&ip->ip_dst, &dst4->sin_addr, sizeof(dst4->sin_addr)); 425 if (sc->sc_ro.ro_rt) { 426 RTFREE(sc->sc_ro.ro_rt); 427 sc->sc_ro.ro_rt = NULL; 428 } 429 } 430 431 if (sc->sc_ro.ro_rt == NULL) { 432 rtalloc(&sc->sc_ro); 433 if (sc->sc_ro.ro_rt == NULL) { 434 m_freem(m); 435 return ENETUNREACH; 436 } 437 } 438 439 return ip_output(m, NULL, &sc->sc_ro, 0, NULL, NULL); 440 } 441 442 static int 443 stf_checkaddr4(sc, in, inifp) 444 struct stf_softc *sc; 445 struct in_addr *in; 446 struct ifnet *inifp; /* incoming interface */ 447 { 448 struct in_ifaddr *ia4; 449 450 /* 451 * reject packets with the following address: 452 * 224.0.0.0/4 0.0.0.0/8 127.0.0.0/8 255.0.0.0/8 453 */ 454 if (IN_MULTICAST(ntohl(in->s_addr))) 455 return -1; 456 switch ((ntohl(in->s_addr) & 0xff000000) >> 24) { 457 case 0: case 127: case 255: 458 return -1; 459 } 460 461 /* 462 * reject packets with broadcast 463 */ 464 for (ia4 = TAILQ_FIRST(&in_ifaddrhead); 465 ia4; 466 ia4 = TAILQ_NEXT(ia4, ia_link)) 467 { 468 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0) 469 continue; 470 if (in->s_addr == ia4->ia_broadaddr.sin_addr.s_addr) 471 return -1; 472 } 473 474 /* 475 * perform ingress filter 476 */ 477 if (sc && (sc->sc_if.if_flags & IFF_LINK2) == 0 && inifp) { 478 struct sockaddr_in sin; 479 struct rtentry *rt; 480 481 bzero(&sin, sizeof(sin)); 482 sin.sin_family = AF_INET; 483 sin.sin_len = sizeof(struct sockaddr_in); 484 sin.sin_addr = *in; 485 rt = rtalloc1((struct sockaddr *)&sin, 0, 0UL); 486 if (!rt || rt->rt_ifp != inifp) { 487 #if 0 488 log(LOG_WARNING, "%s: packet from 0x%x dropped " 489 "due to ingress filter\n", if_name(&sc->sc_if), 490 (u_int32_t)ntohl(sin.sin_addr.s_addr)); 491 #endif 492 if (rt) 493 rtfree(rt); 494 return -1; 495 } 496 rtfree(rt); 497 } 498 499 return 0; 500 } 501 502 static int 503 stf_checkaddr6(sc, in6, inifp) 504 struct stf_softc *sc; 505 struct in6_addr *in6; 506 struct ifnet *inifp; /* incoming interface */ 507 { 508 /* 509 * check 6to4 addresses 510 */ 511 if (IN6_IS_ADDR_6TO4(in6)) 512 return stf_checkaddr4(sc, GET_V4(in6), inifp); 513 514 /* 515 * reject anything that look suspicious. the test is implemented 516 * in ip6_input too, but we check here as well to 517 * (1) reject bad packets earlier, and 518 * (2) to be safe against future ip6_input change. 519 */ 520 if (IN6_IS_ADDR_V4COMPAT(in6) || IN6_IS_ADDR_V4MAPPED(in6)) 521 return -1; 522 523 return 0; 524 } 525 526 void 527 #if __STDC__ 528 in_stf_input(struct mbuf *m, ...) 529 #else 530 in_stf_input(m, va_alist) 531 struct mbuf *m; 532 #endif 533 { 534 int off, proto; 535 struct stf_softc *sc; 536 struct ip *ip; 537 struct ip6_hdr *ip6; 538 u_int8_t otos, itos; 539 int s, isr; 540 struct ifqueue *ifq = NULL; 541 struct ifnet *ifp; 542 va_list ap; 543 544 va_start(ap, m); 545 off = va_arg(ap, int); 546 proto = va_arg(ap, int); 547 va_end(ap); 548 549 if (proto != IPPROTO_IPV6) { 550 m_freem(m); 551 return; 552 } 553 554 ip = mtod(m, struct ip *); 555 556 sc = (struct stf_softc *)encap_getarg(m); 557 558 if (sc == NULL || (sc->sc_if.if_flags & IFF_UP) == 0) { 559 m_freem(m); 560 return; 561 } 562 563 ifp = &sc->sc_if; 564 565 /* 566 * perform sanity check against outer src/dst. 567 * for source, perform ingress filter as well. 568 */ 569 if (stf_checkaddr4(sc, &ip->ip_dst, NULL) < 0 || 570 stf_checkaddr4(sc, &ip->ip_src, m->m_pkthdr.rcvif) < 0) { 571 m_freem(m); 572 return; 573 } 574 575 otos = ip->ip_tos; 576 m_adj(m, off); 577 578 if (m->m_len < sizeof(*ip6)) { 579 m = m_pullup(m, sizeof(*ip6)); 580 if (!m) 581 return; 582 } 583 ip6 = mtod(m, struct ip6_hdr *); 584 585 /* 586 * perform sanity check against inner src/dst. 587 * for source, perform ingress filter as well. 588 */ 589 if (stf_checkaddr6(sc, &ip6->ip6_dst, NULL) < 0 || 590 stf_checkaddr6(sc, &ip6->ip6_src, m->m_pkthdr.rcvif) < 0) { 591 m_freem(m); 592 return; 593 } 594 595 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 596 if ((ifp->if_flags & IFF_LINK1) != 0) 597 ip_ecn_egress(ECN_ALLOWED, &otos, &itos); 598 else 599 ip_ecn_egress(ECN_NOCARE, &otos, &itos); 600 ip6->ip6_flow &= ~htonl(0xff << 20); 601 ip6->ip6_flow |= htonl((u_int32_t)itos << 20); 602 603 m->m_pkthdr.rcvif = ifp; 604 605 if (ifp->if_bpf) { 606 /* 607 * We need to prepend the address family as 608 * a four byte field. Cons up a dummy header 609 * to pacify bpf. This is safe because bpf 610 * will only read from the mbuf (i.e., it won't 611 * try to free it or keep a pointer a to it). 612 */ 613 struct mbuf m0; 614 u_int32_t af = AF_INET6; 615 616 m0.m_next = m; 617 m0.m_len = 4; 618 m0.m_data = (char *)⁡ 619 620 #ifdef HAVE_OLD_BPF 621 bpf_mtap(ifp, &m0); 622 #else 623 bpf_mtap(ifp->if_bpf, &m0); 624 #endif 625 } 626 627 /* 628 * Put the packet to the network layer input queue according to the 629 * specified address family. 630 * See net/if_gif.c for possible issues with packet processing 631 * reorder due to extra queueing. 632 */ 633 ifq = &ip6intrq; 634 isr = NETISR_IPV6; 635 636 s = splimp(); 637 if (IF_QFULL(ifq)) { 638 IF_DROP(ifq); /* update statistics */ 639 m_freem(m); 640 splx(s); 641 return; 642 } 643 IF_ENQUEUE(ifq, m); 644 schednetisr(isr); 645 ifp->if_ipackets++; 646 ifp->if_ibytes += m->m_pkthdr.len; 647 splx(s); 648 } 649 650 /* ARGSUSED */ 651 static void 652 stf_rtrequest(cmd, rt, info) 653 int cmd; 654 struct rtentry *rt; 655 struct rt_addrinfo *info; 656 { 657 658 if (rt) 659 rt->rt_rmx.rmx_mtu = IPV6_MMTU; 660 } 661 662 static int 663 stf_ioctl(ifp, cmd, data) 664 struct ifnet *ifp; 665 u_long cmd; 666 caddr_t data; 667 { 668 struct ifaddr *ifa; 669 struct ifreq *ifr; 670 struct sockaddr_in6 *sin6; 671 int error; 672 673 error = 0; 674 switch (cmd) { 675 case SIOCSIFADDR: 676 ifa = (struct ifaddr *)data; 677 if (ifa == NULL || ifa->ifa_addr->sa_family != AF_INET6) { 678 error = EAFNOSUPPORT; 679 break; 680 } 681 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 682 if (IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) { 683 ifa->ifa_rtrequest = stf_rtrequest; 684 ifp->if_flags |= IFF_UP; 685 } else 686 error = EINVAL; 687 break; 688 689 case SIOCADDMULTI: 690 case SIOCDELMULTI: 691 ifr = (struct ifreq *)data; 692 if (ifr && ifr->ifr_addr.sa_family == AF_INET6) 693 ; 694 else 695 error = EAFNOSUPPORT; 696 break; 697 698 default: 699 error = EINVAL; 700 break; 701 } 702 703 return error; 704 } 705