1 /* $NetBSD: if_stf.c,v 1.80 2014/06/12 16:43:09 christos Exp $ */ 2 /* $KAME: if_stf.c,v 1.62 2001/06/07 22:32:16 itojun 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 <sys/cdefs.h> 78 __KERNEL_RCSID(0, "$NetBSD: if_stf.c,v 1.80 2014/06/12 16:43:09 christos Exp $"); 79 80 #include "opt_inet.h" 81 #ifndef INET6 82 #error "pseudo-device stf requires options INET6" 83 #endif 84 85 #include <sys/param.h> 86 #include <sys/systm.h> 87 #include <sys/socket.h> 88 #include <sys/sockio.h> 89 #include <sys/mbuf.h> 90 #include <sys/errno.h> 91 #include <sys/ioctl.h> 92 #include <sys/proc.h> 93 #include <sys/protosw.h> 94 #include <sys/queue.h> 95 #include <sys/syslog.h> 96 97 #include <sys/cpu.h> 98 99 #include <net/if.h> 100 #include <net/route.h> 101 #include <net/netisr.h> 102 #include <net/if_types.h> 103 #include <net/if_stf.h> 104 105 #include <netinet/in.h> 106 #include <netinet/in_systm.h> 107 #include <netinet/ip.h> 108 #include <netinet/ip_var.h> 109 #include <netinet/in_var.h> 110 111 #include <netinet/ip6.h> 112 #include <netinet6/ip6_var.h> 113 #include <netinet6/in6_gif.h> 114 #include <netinet6/in6_var.h> 115 #include <netinet/ip_ecn.h> 116 117 #include <netinet/ip_encap.h> 118 119 #include <net/net_osdep.h> 120 121 #include "stf.h" 122 #include "gif.h" /*XXX*/ 123 124 #include <net/bpf.h> 125 126 #if NGIF > 0 127 #include <net/if_gif.h> 128 #endif 129 130 #define IN6_IS_ADDR_6TO4(x) (ntohs((x)->s6_addr16[0]) == 0x2002) 131 #define GET_V4(x) ((const struct in_addr *)(&(x)->s6_addr16[1])) 132 133 struct stf_softc { 134 struct ifnet sc_if; /* common area */ 135 struct route sc_ro; 136 const struct encaptab *encap_cookie; 137 LIST_ENTRY(stf_softc) sc_list; 138 }; 139 140 static LIST_HEAD(, stf_softc) stf_softc_list; 141 142 static int stf_clone_create(struct if_clone *, int); 143 static int stf_clone_destroy(struct ifnet *); 144 145 struct if_clone stf_cloner = 146 IF_CLONE_INITIALIZER("stf", stf_clone_create, stf_clone_destroy); 147 148 #if NGIF > 0 149 extern int ip_gif_ttl; /*XXX*/ 150 #else 151 static int ip_gif_ttl = 40; /*XXX*/ 152 #endif 153 154 extern struct domain inetdomain; 155 156 static const struct protosw in_stf_protosw = 157 { 158 .pr_type = SOCK_RAW, 159 .pr_domain = &inetdomain, 160 .pr_protocol = IPPROTO_IPV6, 161 .pr_flags = PR_ATOMIC|PR_ADDR, 162 .pr_input = in_stf_input, 163 .pr_output = rip_output, 164 .pr_ctlinput = NULL, 165 .pr_ctloutput = rip_ctloutput, 166 .pr_usrreqs = &rip_usrreqs, 167 }; 168 169 void stfattach(int); 170 171 static int stf_encapcheck(struct mbuf *, int, int, void *); 172 static struct in6_ifaddr *stf_getsrcifa6(struct ifnet *); 173 static int stf_output(struct ifnet *, struct mbuf *, const struct sockaddr *, 174 struct rtentry *); 175 static int isrfc1918addr(const struct in_addr *); 176 static int stf_checkaddr4(struct stf_softc *, const struct in_addr *, 177 struct ifnet *); 178 static int stf_checkaddr6(struct stf_softc *, const struct in6_addr *, 179 struct ifnet *); 180 static void stf_rtrequest(int, struct rtentry *, const struct rt_addrinfo *); 181 static int stf_ioctl(struct ifnet *, u_long, void *); 182 183 /* ARGSUSED */ 184 void 185 stfattach(int count) 186 { 187 188 LIST_INIT(&stf_softc_list); 189 if_clone_attach(&stf_cloner); 190 } 191 192 static int 193 stf_clone_create(struct if_clone *ifc, int unit) 194 { 195 struct stf_softc *sc; 196 197 if (LIST_FIRST(&stf_softc_list) != NULL) { 198 /* Only one stf interface is allowed. */ 199 return (EEXIST); 200 } 201 202 sc = malloc(sizeof(struct stf_softc), M_DEVBUF, M_WAIT|M_ZERO); 203 204 if_initname(&sc->sc_if, ifc->ifc_name, unit); 205 206 sc->encap_cookie = encap_attach_func(AF_INET, IPPROTO_IPV6, 207 stf_encapcheck, &in_stf_protosw, sc); 208 if (sc->encap_cookie == NULL) { 209 printf("%s: unable to attach encap\n", if_name(&sc->sc_if)); 210 free(sc, M_DEVBUF); 211 return (EIO); /* XXX */ 212 } 213 214 sc->sc_if.if_mtu = STF_MTU; 215 sc->sc_if.if_flags = 0; 216 sc->sc_if.if_ioctl = stf_ioctl; 217 sc->sc_if.if_output = stf_output; 218 sc->sc_if.if_type = IFT_STF; 219 sc->sc_if.if_dlt = DLT_NULL; 220 if_attach(&sc->sc_if); 221 if_alloc_sadl(&sc->sc_if); 222 bpf_attach(&sc->sc_if, DLT_NULL, sizeof(u_int)); 223 LIST_INSERT_HEAD(&stf_softc_list, sc, sc_list); 224 return (0); 225 } 226 227 static int 228 stf_clone_destroy(struct ifnet *ifp) 229 { 230 struct stf_softc *sc = (void *) ifp; 231 232 LIST_REMOVE(sc, sc_list); 233 encap_detach(sc->encap_cookie); 234 bpf_detach(ifp); 235 if_detach(ifp); 236 rtcache_free(&sc->sc_ro); 237 free(sc, M_DEVBUF); 238 239 return (0); 240 } 241 242 static int 243 stf_encapcheck(struct mbuf *m, int off, int proto, void *arg) 244 { 245 struct ip ip; 246 struct in6_ifaddr *ia6; 247 struct stf_softc *sc; 248 struct in_addr a, b; 249 250 sc = (struct stf_softc *)arg; 251 if (sc == NULL) 252 return 0; 253 254 if ((sc->sc_if.if_flags & IFF_UP) == 0) 255 return 0; 256 257 /* IFF_LINK0 means "no decapsulation" */ 258 if ((sc->sc_if.if_flags & IFF_LINK0) != 0) 259 return 0; 260 261 if (proto != IPPROTO_IPV6) 262 return 0; 263 264 m_copydata(m, 0, sizeof(ip), (void *)&ip); 265 266 if (ip.ip_v != 4) 267 return 0; 268 269 ia6 = stf_getsrcifa6(&sc->sc_if); 270 if (ia6 == NULL) 271 return 0; 272 273 /* 274 * check if IPv4 dst matches the IPv4 address derived from the 275 * local 6to4 address. 276 * success on: dst = 10.1.1.1, ia6->ia_addr = 2002:0a01:0101:... 277 */ 278 if (memcmp(GET_V4(&ia6->ia_addr.sin6_addr), &ip.ip_dst, 279 sizeof(ip.ip_dst)) != 0) 280 return 0; 281 282 /* 283 * check if IPv4 src matches the IPv4 address derived from the 284 * local 6to4 address masked by prefixmask. 285 * success on: src = 10.1.1.1, ia6->ia_addr = 2002:0a00:.../24 286 * fail on: src = 10.1.1.1, ia6->ia_addr = 2002:0b00:.../24 287 */ 288 memset(&a, 0, sizeof(a)); 289 a.s_addr = GET_V4(&ia6->ia_addr.sin6_addr)->s_addr; 290 a.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 291 b = ip.ip_src; 292 b.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 293 if (a.s_addr != b.s_addr) 294 return 0; 295 296 /* stf interface makes single side match only */ 297 return 32; 298 } 299 300 static struct in6_ifaddr * 301 stf_getsrcifa6(struct ifnet *ifp) 302 { 303 struct ifaddr *ifa; 304 struct in_ifaddr *ia4; 305 struct sockaddr_in6 *sin6; 306 struct in_addr in; 307 308 IFADDR_FOREACH(ifa, ifp) 309 { 310 if (ifa->ifa_addr == NULL) 311 continue; 312 if (ifa->ifa_addr->sa_family != AF_INET6) 313 continue; 314 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 315 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) 316 continue; 317 318 memcpy(&in, GET_V4(&sin6->sin6_addr), sizeof(in)); 319 INADDR_TO_IA(in, ia4); 320 if (ia4 == NULL) 321 continue; 322 323 return (struct in6_ifaddr *)ifa; 324 } 325 326 return NULL; 327 } 328 329 static int 330 stf_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 331 struct rtentry *rt0) 332 { 333 struct rtentry *rt; 334 struct stf_softc *sc; 335 const struct sockaddr_in6 *dst6; 336 const struct in_addr *in4; 337 uint8_t tos; 338 struct ip *ip; 339 struct ip6_hdr *ip6; 340 struct in6_ifaddr *ia6; 341 union { 342 struct sockaddr dst; 343 struct sockaddr_in dst4; 344 } u; 345 346 sc = (struct stf_softc*)ifp; 347 dst6 = (const struct sockaddr_in6 *)dst; 348 349 /* just in case */ 350 if ((ifp->if_flags & IFF_UP) == 0) { 351 m_freem(m); 352 return ENETDOWN; 353 } 354 355 /* 356 * If we don't have an ip4 address that match my inner ip6 address, 357 * we shouldn't generate output. Without this check, we'll end up 358 * using wrong IPv4 source. 359 */ 360 ia6 = stf_getsrcifa6(ifp); 361 if (ia6 == NULL) { 362 m_freem(m); 363 ifp->if_oerrors++; 364 return ENETDOWN; 365 } 366 367 if (m->m_len < sizeof(*ip6)) { 368 m = m_pullup(m, sizeof(*ip6)); 369 if (m == NULL) { 370 ifp->if_oerrors++; 371 return ENOBUFS; 372 } 373 } 374 ip6 = mtod(m, struct ip6_hdr *); 375 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 376 377 /* 378 * Pickup the right outer dst addr from the list of candidates. 379 * ip6_dst has priority as it may be able to give us shorter IPv4 hops. 380 */ 381 if (IN6_IS_ADDR_6TO4(&ip6->ip6_dst)) 382 in4 = GET_V4(&ip6->ip6_dst); 383 else if (IN6_IS_ADDR_6TO4(&dst6->sin6_addr)) 384 in4 = GET_V4(&dst6->sin6_addr); 385 else { 386 m_freem(m); 387 ifp->if_oerrors++; 388 return ENETUNREACH; 389 } 390 391 bpf_mtap_af(ifp, AF_INET6, m); 392 393 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 394 if (m && m->m_len < sizeof(struct ip)) 395 m = m_pullup(m, sizeof(struct ip)); 396 if (m == NULL) { 397 ifp->if_oerrors++; 398 return ENOBUFS; 399 } 400 ip = mtod(m, struct ip *); 401 402 memset(ip, 0, sizeof(*ip)); 403 404 bcopy(GET_V4(&((struct sockaddr_in6 *)&ia6->ia_addr)->sin6_addr), 405 &ip->ip_src, sizeof(ip->ip_src)); 406 memcpy(&ip->ip_dst, in4, sizeof(ip->ip_dst)); 407 ip->ip_p = IPPROTO_IPV6; 408 ip->ip_ttl = ip_gif_ttl; /*XXX*/ 409 ip->ip_len = htons(m->m_pkthdr.len); 410 if (ifp->if_flags & IFF_LINK1) 411 ip_ecn_ingress(ECN_ALLOWED, &ip->ip_tos, &tos); 412 else 413 ip_ecn_ingress(ECN_NOCARE, &ip->ip_tos, &tos); 414 415 sockaddr_in_init(&u.dst4, &ip->ip_dst, 0); 416 if ((rt = rtcache_lookup(&sc->sc_ro, &u.dst)) == NULL) { 417 m_freem(m); 418 ifp->if_oerrors++; 419 return ENETUNREACH; 420 } 421 422 /* If the route constitutes infinite encapsulation, punt. */ 423 if (rt->rt_ifp == ifp) { 424 rtcache_free(&sc->sc_ro); 425 m_freem(m); 426 ifp->if_oerrors++; 427 return ENETUNREACH; 428 } 429 430 ifp->if_opackets++; 431 ifp->if_obytes += m->m_pkthdr.len - sizeof(struct ip); 432 return ip_output(m, NULL, &sc->sc_ro, 0, NULL, NULL); 433 } 434 435 static int 436 isrfc1918addr(const struct in_addr *in) 437 { 438 /* 439 * returns 1 if private address range: 440 * 10.0.0.0/8 172.16.0.0/12 192.168.0.0/16 441 */ 442 if ((ntohl(in->s_addr) & 0xff000000) >> 24 == 10 || 443 (ntohl(in->s_addr) & 0xfff00000) >> 16 == 172 * 256 + 16 || 444 (ntohl(in->s_addr) & 0xffff0000) >> 16 == 192 * 256 + 168) 445 return 1; 446 447 return 0; 448 } 449 450 static int 451 stf_checkaddr4(struct stf_softc *sc, const struct in_addr *in, 452 struct ifnet *inifp /*incoming interface*/) 453 { 454 struct in_ifaddr *ia4; 455 456 /* 457 * reject packets with the following address: 458 * 224.0.0.0/4 0.0.0.0/8 127.0.0.0/8 255.0.0.0/8 459 */ 460 if (IN_MULTICAST(in->s_addr)) 461 return -1; 462 switch ((ntohl(in->s_addr) & 0xff000000) >> 24) { 463 case 0: case 127: case 255: 464 return -1; 465 } 466 467 /* 468 * reject packets with private address range. 469 * (requirement from RFC3056 section 2 1st paragraph) 470 */ 471 if (isrfc1918addr(in)) 472 return -1; 473 474 /* 475 * reject packet with IPv4 link-local (169.254.0.0/16), 476 * as suggested in draft-savola-v6ops-6to4-security-00.txt 477 */ 478 if (((ntohl(in->s_addr) & 0xff000000) >> 24) == 169 && 479 ((ntohl(in->s_addr) & 0x00ff0000) >> 16) == 254) 480 return -1; 481 482 /* 483 * reject packets with broadcast 484 */ 485 TAILQ_FOREACH(ia4, &in_ifaddrhead, ia_list) 486 { 487 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0) 488 continue; 489 if (in->s_addr == ia4->ia_broadaddr.sin_addr.s_addr) 490 return -1; 491 } 492 493 /* 494 * perform ingress filter 495 */ 496 if (sc && (sc->sc_if.if_flags & IFF_LINK2) == 0 && inifp) { 497 struct sockaddr_in sin; 498 struct rtentry *rt; 499 500 memset(&sin, 0, sizeof(sin)); 501 sin.sin_family = AF_INET; 502 sin.sin_len = sizeof(struct sockaddr_in); 503 sin.sin_addr = *in; 504 rt = rtalloc1((struct sockaddr *)&sin, 0); 505 if (!rt || rt->rt_ifp != inifp) { 506 #if 0 507 log(LOG_WARNING, "%s: packet from 0x%x dropped " 508 "due to ingress filter\n", if_name(&sc->sc_if), 509 (uint32_t)ntohl(sin.sin_addr.s_addr)); 510 #endif 511 if (rt) 512 rtfree(rt); 513 return -1; 514 } 515 rtfree(rt); 516 } 517 518 return 0; 519 } 520 521 static int 522 stf_checkaddr6(struct stf_softc *sc, const struct in6_addr *in6, 523 struct ifnet *inifp /*incoming interface*/) 524 { 525 526 /* 527 * check 6to4 addresses 528 */ 529 if (IN6_IS_ADDR_6TO4(in6)) 530 return stf_checkaddr4(sc, GET_V4(in6), inifp); 531 532 /* 533 * reject anything that look suspicious. the test is implemented 534 * in ip6_input too, but we check here as well to 535 * (1) reject bad packets earlier, and 536 * (2) to be safe against future ip6_input change. 537 */ 538 if (IN6_IS_ADDR_V4COMPAT(in6) || IN6_IS_ADDR_V4MAPPED(in6)) 539 return -1; 540 541 /* 542 * reject link-local and site-local unicast 543 * as suggested in draft-savola-v6ops-6to4-security-00.txt 544 */ 545 if (IN6_IS_ADDR_LINKLOCAL(in6) || IN6_IS_ADDR_SITELOCAL(in6)) 546 return -1; 547 548 /* 549 * reject node-local and link-local multicast 550 * as suggested in draft-savola-v6ops-6to4-security-00.txt 551 */ 552 if (IN6_IS_ADDR_MC_NODELOCAL(in6) || IN6_IS_ADDR_MC_LINKLOCAL(in6)) 553 return -1; 554 555 return 0; 556 } 557 558 void 559 in_stf_input(struct mbuf *m, ...) 560 { 561 int s, off, proto; 562 struct stf_softc *sc; 563 struct ip *ip; 564 struct ip6_hdr *ip6; 565 uint8_t otos, itos; 566 struct ifnet *ifp; 567 size_t pktlen; 568 va_list ap; 569 570 va_start(ap, m); 571 off = va_arg(ap, int); 572 proto = va_arg(ap, int); 573 va_end(ap); 574 575 if (proto != IPPROTO_IPV6) { 576 m_freem(m); 577 return; 578 } 579 580 ip = mtod(m, struct ip *); 581 582 sc = (struct stf_softc *)encap_getarg(m); 583 584 if (sc == NULL || (sc->sc_if.if_flags & IFF_UP) == 0) { 585 m_freem(m); 586 return; 587 } 588 589 ifp = &sc->sc_if; 590 591 /* 592 * perform sanity check against outer src/dst. 593 * for source, perform ingress filter as well. 594 */ 595 if (stf_checkaddr4(sc, &ip->ip_dst, NULL) < 0 || 596 stf_checkaddr4(sc, &ip->ip_src, m->m_pkthdr.rcvif) < 0) { 597 m_freem(m); 598 return; 599 } 600 601 otos = ip->ip_tos; 602 m_adj(m, off); 603 604 if (m->m_len < sizeof(*ip6)) { 605 m = m_pullup(m, sizeof(*ip6)); 606 if (!m) 607 return; 608 } 609 ip6 = mtod(m, struct ip6_hdr *); 610 611 /* 612 * perform sanity check against inner src/dst. 613 * for source, perform ingress filter as well. 614 */ 615 if (stf_checkaddr6(sc, &ip6->ip6_dst, NULL) < 0 || 616 stf_checkaddr6(sc, &ip6->ip6_src, m->m_pkthdr.rcvif) < 0) { 617 m_freem(m); 618 return; 619 } 620 621 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 622 if ((ifp->if_flags & IFF_LINK1) != 0) 623 ip_ecn_egress(ECN_ALLOWED, &otos, &itos); 624 else 625 ip_ecn_egress(ECN_NOCARE, &otos, &itos); 626 ip6->ip6_flow &= ~htonl(0xff << 20); 627 ip6->ip6_flow |= htonl((uint32_t)itos << 20); 628 629 pktlen = m->m_pkthdr.len; 630 m->m_pkthdr.rcvif = ifp; 631 632 bpf_mtap_af(ifp, AF_INET6, m); 633 634 /* 635 * Put the packet to the network layer input queue according to the 636 * specified address family. 637 * See net/if_gif.c for possible issues with packet processing 638 * reorder due to extra queueing. 639 */ 640 641 s = splnet(); 642 if (__predict_true(pktq_enqueue(ip6_pktq, m, 0))) { 643 ifp->if_ipackets++; 644 ifp->if_ibytes += pktlen; 645 } else { 646 m_freem(m); 647 } 648 splx(s); 649 } 650 651 /* ARGSUSED */ 652 static void 653 stf_rtrequest(int cmd, struct rtentry *rt, 654 const struct rt_addrinfo *info) 655 { 656 if (rt != NULL) { 657 struct stf_softc *sc; 658 659 sc = LIST_FIRST(&stf_softc_list); 660 rt->rt_rmx.rmx_mtu = (sc != NULL) ? sc->sc_if.if_mtu : STF_MTU; 661 } 662 } 663 664 static int 665 stf_ioctl(struct ifnet *ifp, u_long cmd, void *data) 666 { 667 struct ifaddr *ifa; 668 struct ifreq *ifr = data; 669 struct sockaddr_in6 *sin6; 670 int error; 671 672 error = 0; 673 switch (cmd) { 674 case SIOCINITIFADDR: 675 ifa = (struct ifaddr *)data; 676 if (ifa == NULL || ifa->ifa_addr->sa_family != AF_INET6) { 677 error = EAFNOSUPPORT; 678 break; 679 } 680 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 681 if (IN6_IS_ADDR_6TO4(&sin6->sin6_addr) && 682 !isrfc1918addr(GET_V4(&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 if (ifr != NULL && 692 ifreq_getaddr(cmd, ifr)->sa_family == AF_INET6) 693 ; 694 else 695 error = EAFNOSUPPORT; 696 break; 697 698 case SIOCSIFMTU: 699 if (ifr->ifr_mtu < STF_MTU_MIN || ifr->ifr_mtu > STF_MTU_MAX) 700 return EINVAL; 701 else if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 702 error = 0; 703 break; 704 705 default: 706 error = ifioctl_common(ifp, cmd, data); 707 break; 708 } 709 710 return error; 711 } 712