1 /* $FreeBSD: src/sys/net/if_stf.c,v 1.1.2.11 2003/01/23 21:06:44 sam Exp $ */ 2 /* $DragonFly: src/sys/net/stf/if_stf.c,v 1.4 2003/08/07 21:17:30 dillon Exp $ */ 3 /* $KAME: if_stf.c,v 1.73 2001/12/03 11:08:30 keiichi Exp $ */ 4 5 /* 6 * Copyright (C) 2000 WIDE Project. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the project nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 /* 35 * 6to4 interface, based on RFC3056. 36 * 37 * 6to4 interface is NOT capable of link-layer (I mean, IPv4) multicasting. 38 * There is no address mapping defined from IPv6 multicast address to IPv4 39 * address. Therefore, we do not have IFF_MULTICAST on the interface. 40 * 41 * Due to the lack of address mapping for link-local addresses, we cannot 42 * throw packets toward link-local addresses (fe80::x). Also, we cannot throw 43 * packets to link-local multicast addresses (ff02::x). 44 * 45 * Here are interesting symptoms due to the lack of link-local address: 46 * 47 * Unicast routing exchange: 48 * - RIPng: Impossible. Uses link-local multicast packet toward ff02::9, 49 * and link-local addresses as nexthop. 50 * - OSPFv6: Impossible. OSPFv6 assumes that there's link-local address 51 * assigned to the link, and makes use of them. Also, HELLO packets use 52 * link-local multicast addresses (ff02::5 and ff02::6). 53 * - BGP4+: Maybe. You can only use global address as nexthop, and global 54 * address as TCP endpoint address. 55 * 56 * Multicast routing protocols: 57 * - PIM: Hello packet cannot be used to discover adjacent PIM routers. 58 * Adjacent PIM routers must be configured manually (is it really spec-wise 59 * correct thing to do?). 60 * 61 * ICMPv6: 62 * - Redirects cannot be used due to the lack of link-local address. 63 * 64 * stf interface does not have, and will not need, a link-local address. 65 * It seems to have no real benefit and does not help the above symptoms much. 66 * Even if we assign link-locals to interface, we cannot really 67 * use link-local unicast/multicast on top of 6to4 cloud (since there's no 68 * encapsulation defined for link-local address), and the above analysis does 69 * not change. RFC3056 does not mandate the assignment of link-local address 70 * either. 71 * 72 * 6to4 interface has security issues. Refer to 73 * http://playground.iijlab.net/i-d/draft-itojun-ipv6-transition-abuse-00.txt 74 * for details. The code tries to filter out some of malicious packets. 75 * Note that there is no way to be 100% secure. 76 */ 77 78 #include "opt_inet.h" 79 #include "opt_inet6.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/mbuf.h> 86 #include <sys/errno.h> 87 #include <sys/protosw.h> 88 #include <sys/kernel.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 "if_stf.h" 98 99 #include <netinet/in.h> 100 #include <netinet/in_systm.h> 101 #include <netinet/ip.h> 102 #include <netinet/ipprotosw.h> 103 #include <netinet/ip_var.h> 104 #include <netinet/in_var.h> 105 106 #include <netinet/ip6.h> 107 #include <netinet6/ip6_var.h> 108 #include <netinet6/in6_var.h> 109 #include <netinet/ip_ecn.h> 110 111 #include <netinet/ip_encap.h> 112 113 #include <machine/stdarg.h> 114 115 #include <net/net_osdep.h> 116 117 #include <net/bpf.h> 118 119 #define IN6_IS_ADDR_6TO4(x) (ntohs((x)->s6_addr16[0]) == 0x2002) 120 #define GET_V4(x) ((struct in_addr *)(&(x)->s6_addr16[1])) 121 122 struct stf_softc { 123 struct ifnet sc_if; /* common area */ 124 union { 125 struct route __sc_ro4; 126 struct route_in6 __sc_ro6; /* just for safety */ 127 } __sc_ro46; 128 #define sc_ro __sc_ro46.__sc_ro4 129 const struct encaptab *encap_cookie; 130 }; 131 132 static struct stf_softc *stf; 133 134 static MALLOC_DEFINE(M_STF, "stf", "6to4 Tunnel Interface"); 135 static int ip_stf_ttl = 40; 136 137 extern struct domain inetdomain; 138 struct ipprotosw in_stf_protosw = 139 { SOCK_RAW, &inetdomain, IPPROTO_IPV6, PR_ATOMIC|PR_ADDR, 140 in_stf_input, rip_output, 0, rip_ctloutput, 141 0, 142 0, 0, 0, 0, 143 &rip_usrreqs 144 }; 145 146 static int stfmodevent __P((module_t, int, void *)); 147 static int stf_encapcheck __P((const struct mbuf *, int, int, void *)); 148 static struct in6_ifaddr *stf_getsrcifa6 __P((struct ifnet *)); 149 static int stf_output __P((struct ifnet *, struct mbuf *, struct sockaddr *, 150 struct rtentry *)); 151 static int stf_checkaddr4 __P((struct stf_softc *, struct in_addr *, 152 struct ifnet *)); 153 static int stf_checkaddr6 __P((struct stf_softc *, struct in6_addr *, 154 struct ifnet *)); 155 static void stf_rtrequest __P((int, struct rtentry *, struct rt_addrinfo *)); 156 static int stf_ioctl __P((struct ifnet *, u_long, caddr_t)); 157 158 static int 159 stfmodevent(mod, type, data) 160 module_t mod; 161 int type; 162 void *data; 163 { 164 struct stf_softc *sc; 165 int err; 166 const struct encaptab *p; 167 168 switch (type) { 169 case MOD_LOAD: 170 stf = malloc(sizeof(struct stf_softc), M_STF, M_WAITOK); 171 bzero(stf, sizeof(struct stf_softc)); 172 sc = stf; 173 174 bzero(sc, sizeof(*sc)); 175 sc->sc_if.if_name = "stf"; 176 sc->sc_if.if_unit = 0; 177 178 p = encap_attach_func(AF_INET, IPPROTO_IPV6, stf_encapcheck, 179 (void *)&in_stf_protosw, sc); 180 if (p == NULL) { 181 printf("%s: attach failed\n", if_name(&sc->sc_if)); 182 return (ENOMEM); 183 } 184 sc->encap_cookie = p; 185 186 sc->sc_if.if_mtu = IPV6_MMTU; 187 sc->sc_if.if_flags = 0; 188 sc->sc_if.if_ioctl = stf_ioctl; 189 sc->sc_if.if_output = stf_output; 190 sc->sc_if.if_type = IFT_STF; 191 #if 0 192 /* turn off ingress filter */ 193 sc->sc_if.if_flags |= IFF_LINK2; 194 #endif 195 sc->sc_if.if_snd.ifq_maxlen = IFQ_MAXLEN; 196 if_attach(&sc->sc_if); 197 #ifdef HAVE_OLD_BPF 198 bpfattach(&sc->sc_if, DLT_NULL, sizeof(u_int)); 199 #else 200 bpfattach(&sc->sc_if.if_bpf, &sc->sc_if, DLT_NULL, sizeof(u_int)); 201 #endif 202 break; 203 case MOD_UNLOAD: 204 sc = stf; 205 bpfdetach(&sc->sc_if); 206 if_detach(&sc->sc_if); 207 err = encap_detach(sc->encap_cookie); 208 KASSERT(err == 0, ("Unexpected error detaching encap_cookie")); 209 free(sc, M_STF); 210 break; 211 } 212 213 return (0); 214 } 215 216 static moduledata_t stf_mod = { 217 "if_stf", 218 stfmodevent, 219 0 220 }; 221 222 DECLARE_MODULE(if_stf, stf_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 223 224 static int 225 stf_encapcheck(m, off, proto, arg) 226 const struct mbuf *m; 227 int off; 228 int proto; 229 void *arg; 230 { 231 struct ip ip; 232 struct in6_ifaddr *ia6; 233 struct stf_softc *sc; 234 struct in_addr a, b; 235 236 sc = (struct stf_softc *)arg; 237 if (sc == NULL) 238 return 0; 239 240 if ((sc->sc_if.if_flags & IFF_UP) == 0) 241 return 0; 242 243 /* IFF_LINK0 means "no decapsulation" */ 244 if ((sc->sc_if.if_flags & IFF_LINK0) != 0) 245 return 0; 246 247 if (proto != IPPROTO_IPV6) 248 return 0; 249 250 m_copydata(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 in_stf_input(struct mbuf *m, int off, int proto) 528 { 529 struct stf_softc *sc; 530 struct ip *ip; 531 struct ip6_hdr *ip6; 532 u_int8_t otos, itos; 533 int s, isr; 534 struct ifqueue *ifq = NULL; 535 struct ifnet *ifp; 536 537 if (proto != IPPROTO_IPV6) { 538 m_freem(m); 539 return; 540 } 541 542 ip = mtod(m, struct ip *); 543 544 sc = (struct stf_softc *)encap_getarg(m); 545 546 if (sc == NULL || (sc->sc_if.if_flags & IFF_UP) == 0) { 547 m_freem(m); 548 return; 549 } 550 551 ifp = &sc->sc_if; 552 553 /* 554 * perform sanity check against outer src/dst. 555 * for source, perform ingress filter as well. 556 */ 557 if (stf_checkaddr4(sc, &ip->ip_dst, NULL) < 0 || 558 stf_checkaddr4(sc, &ip->ip_src, m->m_pkthdr.rcvif) < 0) { 559 m_freem(m); 560 return; 561 } 562 563 otos = ip->ip_tos; 564 m_adj(m, off); 565 566 if (m->m_len < sizeof(*ip6)) { 567 m = m_pullup(m, sizeof(*ip6)); 568 if (!m) 569 return; 570 } 571 ip6 = mtod(m, struct ip6_hdr *); 572 573 /* 574 * perform sanity check against inner src/dst. 575 * for source, perform ingress filter as well. 576 */ 577 if (stf_checkaddr6(sc, &ip6->ip6_dst, NULL) < 0 || 578 stf_checkaddr6(sc, &ip6->ip6_src, m->m_pkthdr.rcvif) < 0) { 579 m_freem(m); 580 return; 581 } 582 583 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 584 if ((ifp->if_flags & IFF_LINK1) != 0) 585 ip_ecn_egress(ECN_ALLOWED, &otos, &itos); 586 else 587 ip_ecn_egress(ECN_NOCARE, &otos, &itos); 588 ip6->ip6_flow &= ~htonl(0xff << 20); 589 ip6->ip6_flow |= htonl((u_int32_t)itos << 20); 590 591 m->m_pkthdr.rcvif = ifp; 592 593 if (ifp->if_bpf) { 594 /* 595 * We need to prepend the address family as 596 * a four byte field. Cons up a dummy header 597 * to pacify bpf. This is safe because bpf 598 * will only read from the mbuf (i.e., it won't 599 * try to free it or keep a pointer a to it). 600 */ 601 struct mbuf m0; 602 u_int32_t af = AF_INET6; 603 604 m0.m_next = m; 605 m0.m_len = 4; 606 m0.m_data = (char *)⁡ 607 608 #ifdef HAVE_OLD_BPF 609 bpf_mtap(ifp, &m0); 610 #else 611 bpf_mtap(ifp->if_bpf, &m0); 612 #endif 613 } 614 615 /* 616 * Put the packet to the network layer input queue according to the 617 * specified address family. 618 * See net/if_gif.c for possible issues with packet processing 619 * reorder due to extra queueing. 620 */ 621 ifq = &ip6intrq; 622 isr = NETISR_IPV6; 623 624 s = splimp(); 625 if (IF_QFULL(ifq)) { 626 IF_DROP(ifq); /* update statistics */ 627 m_freem(m); 628 splx(s); 629 return; 630 } 631 IF_ENQUEUE(ifq, m); 632 schednetisr(isr); 633 ifp->if_ipackets++; 634 ifp->if_ibytes += m->m_pkthdr.len; 635 splx(s); 636 } 637 638 /* ARGSUSED */ 639 static void 640 stf_rtrequest(cmd, rt, info) 641 int cmd; 642 struct rtentry *rt; 643 struct rt_addrinfo *info; 644 { 645 646 if (rt) 647 rt->rt_rmx.rmx_mtu = IPV6_MMTU; 648 } 649 650 static int 651 stf_ioctl(ifp, cmd, data) 652 struct ifnet *ifp; 653 u_long cmd; 654 caddr_t data; 655 { 656 struct ifaddr *ifa; 657 struct ifreq *ifr; 658 struct sockaddr_in6 *sin6; 659 int error; 660 661 error = 0; 662 switch (cmd) { 663 case SIOCSIFADDR: 664 ifa = (struct ifaddr *)data; 665 if (ifa == NULL || ifa->ifa_addr->sa_family != AF_INET6) { 666 error = EAFNOSUPPORT; 667 break; 668 } 669 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 670 if (IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) { 671 ifa->ifa_rtrequest = stf_rtrequest; 672 ifp->if_flags |= IFF_UP; 673 } else 674 error = EINVAL; 675 break; 676 677 case SIOCADDMULTI: 678 case SIOCDELMULTI: 679 ifr = (struct ifreq *)data; 680 if (ifr && ifr->ifr_addr.sa_family == AF_INET6) 681 ; 682 else 683 error = EAFNOSUPPORT; 684 break; 685 686 default: 687 error = EINVAL; 688 break; 689 } 690 691 return error; 692 } 693