1 /* $NetBSD: if_stf.c,v 1.82 2015/08/24 22:21:26 pooka 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 1.82 2015/08/24 22:21:26 pooka Exp $"); 79 80 #ifdef _KERNEL_OPT 81 #include "opt_inet.h" 82 #endif 83 84 #ifndef INET6 85 #error "pseudo-device stf requires options INET6" 86 #endif 87 88 #include <sys/param.h> 89 #include <sys/systm.h> 90 #include <sys/socket.h> 91 #include <sys/sockio.h> 92 #include <sys/mbuf.h> 93 #include <sys/errno.h> 94 #include <sys/ioctl.h> 95 #include <sys/proc.h> 96 #include <sys/protosw.h> 97 #include <sys/queue.h> 98 #include <sys/syslog.h> 99 100 #include <sys/cpu.h> 101 102 #include <net/if.h> 103 #include <net/route.h> 104 #include <net/netisr.h> 105 #include <net/if_types.h> 106 #include <net/if_stf.h> 107 108 #include <netinet/in.h> 109 #include <netinet/in_systm.h> 110 #include <netinet/ip.h> 111 #include <netinet/ip_var.h> 112 #include <netinet/in_var.h> 113 114 #include <netinet/ip6.h> 115 #include <netinet6/ip6_var.h> 116 #include <netinet6/in6_gif.h> 117 #include <netinet6/in6_var.h> 118 #include <netinet/ip_ecn.h> 119 120 #include <netinet/ip_encap.h> 121 122 #include <net/net_osdep.h> 123 124 #include "stf.h" 125 #include "gif.h" /*XXX*/ 126 127 #include <net/bpf.h> 128 129 #if NGIF > 0 130 #include <net/if_gif.h> 131 #endif 132 133 #include "ioconf.h" 134 135 #define IN6_IS_ADDR_6TO4(x) (ntohs((x)->s6_addr16[0]) == 0x2002) 136 #define GET_V4(x) ((const struct in_addr *)(&(x)->s6_addr16[1])) 137 138 struct stf_softc { 139 struct ifnet sc_if; /* common area */ 140 struct route sc_ro; 141 const struct encaptab *encap_cookie; 142 LIST_ENTRY(stf_softc) sc_list; 143 }; 144 145 static LIST_HEAD(, stf_softc) stf_softc_list; 146 147 static int stf_clone_create(struct if_clone *, int); 148 static int stf_clone_destroy(struct ifnet *); 149 150 struct if_clone stf_cloner = 151 IF_CLONE_INITIALIZER("stf", stf_clone_create, stf_clone_destroy); 152 153 #if NGIF > 0 154 extern int ip_gif_ttl; /*XXX*/ 155 #else 156 static int ip_gif_ttl = 40; /*XXX*/ 157 #endif 158 159 extern struct domain inetdomain; 160 161 static const struct protosw in_stf_protosw = 162 { 163 .pr_type = SOCK_RAW, 164 .pr_domain = &inetdomain, 165 .pr_protocol = IPPROTO_IPV6, 166 .pr_flags = PR_ATOMIC|PR_ADDR, 167 .pr_input = in_stf_input, 168 .pr_output = rip_output, 169 .pr_ctlinput = NULL, 170 .pr_ctloutput = rip_ctloutput, 171 .pr_usrreqs = &rip_usrreqs, 172 }; 173 174 static int stf_encapcheck(struct mbuf *, int, int, void *); 175 static struct in6_ifaddr *stf_getsrcifa6(struct ifnet *); 176 static int stf_output(struct ifnet *, struct mbuf *, const struct sockaddr *, 177 struct rtentry *); 178 static int isrfc1918addr(const struct in_addr *); 179 static int stf_checkaddr4(struct stf_softc *, const struct in_addr *, 180 struct ifnet *); 181 static int stf_checkaddr6(struct stf_softc *, const struct in6_addr *, 182 struct ifnet *); 183 static void stf_rtrequest(int, struct rtentry *, const struct rt_addrinfo *); 184 static int stf_ioctl(struct ifnet *, u_long, void *); 185 186 /* ARGSUSED */ 187 void 188 stfattach(int count) 189 { 190 191 LIST_INIT(&stf_softc_list); 192 if_clone_attach(&stf_cloner); 193 } 194 195 static int 196 stf_clone_create(struct if_clone *ifc, int unit) 197 { 198 struct stf_softc *sc; 199 200 if (LIST_FIRST(&stf_softc_list) != NULL) { 201 /* Only one stf interface is allowed. */ 202 return (EEXIST); 203 } 204 205 sc = malloc(sizeof(struct stf_softc), M_DEVBUF, M_WAIT|M_ZERO); 206 207 if_initname(&sc->sc_if, ifc->ifc_name, unit); 208 209 sc->encap_cookie = encap_attach_func(AF_INET, IPPROTO_IPV6, 210 stf_encapcheck, &in_stf_protosw, sc); 211 if (sc->encap_cookie == NULL) { 212 printf("%s: unable to attach encap\n", if_name(&sc->sc_if)); 213 free(sc, M_DEVBUF); 214 return (EIO); /* XXX */ 215 } 216 217 sc->sc_if.if_mtu = STF_MTU; 218 sc->sc_if.if_flags = 0; 219 sc->sc_if.if_ioctl = stf_ioctl; 220 sc->sc_if.if_output = stf_output; 221 sc->sc_if.if_type = IFT_STF; 222 sc->sc_if.if_dlt = DLT_NULL; 223 if_attach(&sc->sc_if); 224 if_alloc_sadl(&sc->sc_if); 225 bpf_attach(&sc->sc_if, DLT_NULL, sizeof(u_int)); 226 LIST_INSERT_HEAD(&stf_softc_list, sc, sc_list); 227 return (0); 228 } 229 230 static int 231 stf_clone_destroy(struct ifnet *ifp) 232 { 233 struct stf_softc *sc = (void *) ifp; 234 235 LIST_REMOVE(sc, sc_list); 236 encap_detach(sc->encap_cookie); 237 bpf_detach(ifp); 238 if_detach(ifp); 239 rtcache_free(&sc->sc_ro); 240 free(sc, M_DEVBUF); 241 242 return (0); 243 } 244 245 static int 246 stf_encapcheck(struct mbuf *m, int off, int proto, void *arg) 247 { 248 struct ip ip; 249 struct in6_ifaddr *ia6; 250 struct stf_softc *sc; 251 struct in_addr a, b; 252 253 sc = (struct stf_softc *)arg; 254 if (sc == NULL) 255 return 0; 256 257 if ((sc->sc_if.if_flags & IFF_UP) == 0) 258 return 0; 259 260 /* IFF_LINK0 means "no decapsulation" */ 261 if ((sc->sc_if.if_flags & IFF_LINK0) != 0) 262 return 0; 263 264 if (proto != IPPROTO_IPV6) 265 return 0; 266 267 m_copydata(m, 0, sizeof(ip), (void *)&ip); 268 269 if (ip.ip_v != 4) 270 return 0; 271 272 ia6 = stf_getsrcifa6(&sc->sc_if); 273 if (ia6 == NULL) 274 return 0; 275 276 /* 277 * check if IPv4 dst matches the IPv4 address derived from the 278 * local 6to4 address. 279 * success on: dst = 10.1.1.1, ia6->ia_addr = 2002:0a01:0101:... 280 */ 281 if (memcmp(GET_V4(&ia6->ia_addr.sin6_addr), &ip.ip_dst, 282 sizeof(ip.ip_dst)) != 0) 283 return 0; 284 285 /* 286 * check if IPv4 src matches the IPv4 address derived from the 287 * local 6to4 address masked by prefixmask. 288 * success on: src = 10.1.1.1, ia6->ia_addr = 2002:0a00:.../24 289 * fail on: src = 10.1.1.1, ia6->ia_addr = 2002:0b00:.../24 290 */ 291 memset(&a, 0, sizeof(a)); 292 a.s_addr = GET_V4(&ia6->ia_addr.sin6_addr)->s_addr; 293 a.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 294 b = ip.ip_src; 295 b.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 296 if (a.s_addr != b.s_addr) 297 return 0; 298 299 /* stf interface makes single side match only */ 300 return 32; 301 } 302 303 static struct in6_ifaddr * 304 stf_getsrcifa6(struct ifnet *ifp) 305 { 306 struct ifaddr *ifa; 307 struct in_ifaddr *ia4; 308 struct sockaddr_in6 *sin6; 309 struct in_addr in; 310 311 IFADDR_FOREACH(ifa, ifp) 312 { 313 if (ifa->ifa_addr == NULL) 314 continue; 315 if (ifa->ifa_addr->sa_family != AF_INET6) 316 continue; 317 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 318 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) 319 continue; 320 321 memcpy(&in, GET_V4(&sin6->sin6_addr), sizeof(in)); 322 INADDR_TO_IA(in, ia4); 323 if (ia4 == NULL) 324 continue; 325 326 return (struct in6_ifaddr *)ifa; 327 } 328 329 return NULL; 330 } 331 332 static int 333 stf_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 334 struct rtentry *rt0) 335 { 336 struct rtentry *rt; 337 struct stf_softc *sc; 338 const struct sockaddr_in6 *dst6; 339 const struct in_addr *in4; 340 uint8_t tos; 341 struct ip *ip; 342 struct ip6_hdr *ip6; 343 struct in6_ifaddr *ia6; 344 union { 345 struct sockaddr dst; 346 struct sockaddr_in dst4; 347 } u; 348 349 sc = (struct stf_softc*)ifp; 350 dst6 = (const struct sockaddr_in6 *)dst; 351 352 /* just in case */ 353 if ((ifp->if_flags & IFF_UP) == 0) { 354 m_freem(m); 355 return ENETDOWN; 356 } 357 358 /* 359 * If we don't have an ip4 address that match my inner ip6 address, 360 * we shouldn't generate output. Without this check, we'll end up 361 * using wrong IPv4 source. 362 */ 363 ia6 = stf_getsrcifa6(ifp); 364 if (ia6 == NULL) { 365 m_freem(m); 366 ifp->if_oerrors++; 367 return ENETDOWN; 368 } 369 370 if (m->m_len < sizeof(*ip6)) { 371 m = m_pullup(m, sizeof(*ip6)); 372 if (m == NULL) { 373 ifp->if_oerrors++; 374 return ENOBUFS; 375 } 376 } 377 ip6 = mtod(m, struct ip6_hdr *); 378 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 379 380 /* 381 * Pickup the right outer dst addr from the list of candidates. 382 * ip6_dst has priority as it may be able to give us shorter IPv4 hops. 383 */ 384 if (IN6_IS_ADDR_6TO4(&ip6->ip6_dst)) 385 in4 = GET_V4(&ip6->ip6_dst); 386 else if (IN6_IS_ADDR_6TO4(&dst6->sin6_addr)) 387 in4 = GET_V4(&dst6->sin6_addr); 388 else { 389 m_freem(m); 390 ifp->if_oerrors++; 391 return ENETUNREACH; 392 } 393 394 bpf_mtap_af(ifp, AF_INET6, m); 395 396 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 397 if (m && m->m_len < sizeof(struct ip)) 398 m = m_pullup(m, sizeof(struct ip)); 399 if (m == NULL) { 400 ifp->if_oerrors++; 401 return ENOBUFS; 402 } 403 ip = mtod(m, struct ip *); 404 405 memset(ip, 0, sizeof(*ip)); 406 407 bcopy(GET_V4(&((struct sockaddr_in6 *)&ia6->ia_addr)->sin6_addr), 408 &ip->ip_src, sizeof(ip->ip_src)); 409 memcpy(&ip->ip_dst, in4, sizeof(ip->ip_dst)); 410 ip->ip_p = IPPROTO_IPV6; 411 ip->ip_ttl = ip_gif_ttl; /*XXX*/ 412 ip->ip_len = htons(m->m_pkthdr.len); 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 sockaddr_in_init(&u.dst4, &ip->ip_dst, 0); 419 if ((rt = rtcache_lookup(&sc->sc_ro, &u.dst)) == NULL) { 420 m_freem(m); 421 ifp->if_oerrors++; 422 return ENETUNREACH; 423 } 424 425 /* If the route constitutes infinite encapsulation, punt. */ 426 if (rt->rt_ifp == ifp) { 427 rtcache_free(&sc->sc_ro); 428 m_freem(m); 429 ifp->if_oerrors++; 430 return ENETUNREACH; 431 } 432 433 ifp->if_opackets++; 434 ifp->if_obytes += m->m_pkthdr.len - sizeof(struct ip); 435 return ip_output(m, NULL, &sc->sc_ro, 0, NULL, NULL); 436 } 437 438 static int 439 isrfc1918addr(const struct in_addr *in) 440 { 441 /* 442 * returns 1 if private address range: 443 * 10.0.0.0/8 172.16.0.0/12 192.168.0.0/16 444 */ 445 if ((ntohl(in->s_addr) & 0xff000000) >> 24 == 10 || 446 (ntohl(in->s_addr) & 0xfff00000) >> 16 == 172 * 256 + 16 || 447 (ntohl(in->s_addr) & 0xffff0000) >> 16 == 192 * 256 + 168) 448 return 1; 449 450 return 0; 451 } 452 453 static int 454 stf_checkaddr4(struct stf_softc *sc, const struct in_addr *in, 455 struct ifnet *inifp /*incoming interface*/) 456 { 457 struct in_ifaddr *ia4; 458 459 /* 460 * reject packets with the following address: 461 * 224.0.0.0/4 0.0.0.0/8 127.0.0.0/8 255.0.0.0/8 462 */ 463 if (IN_MULTICAST(in->s_addr)) 464 return -1; 465 switch ((ntohl(in->s_addr) & 0xff000000) >> 24) { 466 case 0: case 127: case 255: 467 return -1; 468 } 469 470 /* 471 * reject packets with private address range. 472 * (requirement from RFC3056 section 2 1st paragraph) 473 */ 474 if (isrfc1918addr(in)) 475 return -1; 476 477 /* 478 * reject packet with IPv4 link-local (169.254.0.0/16), 479 * as suggested in draft-savola-v6ops-6to4-security-00.txt 480 */ 481 if (((ntohl(in->s_addr) & 0xff000000) >> 24) == 169 && 482 ((ntohl(in->s_addr) & 0x00ff0000) >> 16) == 254) 483 return -1; 484 485 /* 486 * reject packets with broadcast 487 */ 488 TAILQ_FOREACH(ia4, &in_ifaddrhead, ia_list) 489 { 490 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0) 491 continue; 492 if (in->s_addr == ia4->ia_broadaddr.sin_addr.s_addr) 493 return -1; 494 } 495 496 /* 497 * perform ingress filter 498 */ 499 if (sc && (sc->sc_if.if_flags & IFF_LINK2) == 0 && inifp) { 500 struct sockaddr_in sin; 501 struct rtentry *rt; 502 503 memset(&sin, 0, sizeof(sin)); 504 sin.sin_family = AF_INET; 505 sin.sin_len = sizeof(struct sockaddr_in); 506 sin.sin_addr = *in; 507 rt = rtalloc1((struct sockaddr *)&sin, 0); 508 if (!rt || rt->rt_ifp != inifp) { 509 #if 0 510 log(LOG_WARNING, "%s: packet from 0x%x dropped " 511 "due to ingress filter\n", if_name(&sc->sc_if), 512 (uint32_t)ntohl(sin.sin_addr.s_addr)); 513 #endif 514 if (rt) 515 rtfree(rt); 516 return -1; 517 } 518 rtfree(rt); 519 } 520 521 return 0; 522 } 523 524 static int 525 stf_checkaddr6(struct stf_softc *sc, const struct in6_addr *in6, 526 struct ifnet *inifp /*incoming interface*/) 527 { 528 529 /* 530 * check 6to4 addresses 531 */ 532 if (IN6_IS_ADDR_6TO4(in6)) 533 return stf_checkaddr4(sc, GET_V4(in6), inifp); 534 535 /* 536 * reject anything that look suspicious. the test is implemented 537 * in ip6_input too, but we check here as well to 538 * (1) reject bad packets earlier, and 539 * (2) to be safe against future ip6_input change. 540 */ 541 if (IN6_IS_ADDR_V4COMPAT(in6) || IN6_IS_ADDR_V4MAPPED(in6)) 542 return -1; 543 544 /* 545 * reject link-local and site-local unicast 546 * as suggested in draft-savola-v6ops-6to4-security-00.txt 547 */ 548 if (IN6_IS_ADDR_LINKLOCAL(in6) || IN6_IS_ADDR_SITELOCAL(in6)) 549 return -1; 550 551 /* 552 * reject node-local and link-local multicast 553 * as suggested in draft-savola-v6ops-6to4-security-00.txt 554 */ 555 if (IN6_IS_ADDR_MC_NODELOCAL(in6) || IN6_IS_ADDR_MC_LINKLOCAL(in6)) 556 return -1; 557 558 return 0; 559 } 560 561 void 562 in_stf_input(struct mbuf *m, ...) 563 { 564 int s, off, proto; 565 struct stf_softc *sc; 566 struct ip *ip; 567 struct ip6_hdr *ip6; 568 uint8_t otos, itos; 569 struct ifnet *ifp; 570 size_t pktlen; 571 va_list ap; 572 573 va_start(ap, m); 574 off = va_arg(ap, int); 575 proto = va_arg(ap, int); 576 va_end(ap); 577 578 if (proto != IPPROTO_IPV6) { 579 m_freem(m); 580 return; 581 } 582 583 ip = mtod(m, struct ip *); 584 585 sc = (struct stf_softc *)encap_getarg(m); 586 587 if (sc == NULL || (sc->sc_if.if_flags & IFF_UP) == 0) { 588 m_freem(m); 589 return; 590 } 591 592 ifp = &sc->sc_if; 593 594 /* 595 * perform sanity check against outer src/dst. 596 * for source, perform ingress filter as well. 597 */ 598 if (stf_checkaddr4(sc, &ip->ip_dst, NULL) < 0 || 599 stf_checkaddr4(sc, &ip->ip_src, m->m_pkthdr.rcvif) < 0) { 600 m_freem(m); 601 return; 602 } 603 604 otos = ip->ip_tos; 605 m_adj(m, off); 606 607 if (m->m_len < sizeof(*ip6)) { 608 m = m_pullup(m, sizeof(*ip6)); 609 if (!m) 610 return; 611 } 612 ip6 = mtod(m, struct ip6_hdr *); 613 614 /* 615 * perform sanity check against inner src/dst. 616 * for source, perform ingress filter as well. 617 */ 618 if (stf_checkaddr6(sc, &ip6->ip6_dst, NULL) < 0 || 619 stf_checkaddr6(sc, &ip6->ip6_src, m->m_pkthdr.rcvif) < 0) { 620 m_freem(m); 621 return; 622 } 623 624 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 625 if ((ifp->if_flags & IFF_LINK1) != 0) 626 ip_ecn_egress(ECN_ALLOWED, &otos, &itos); 627 else 628 ip_ecn_egress(ECN_NOCARE, &otos, &itos); 629 ip6->ip6_flow &= ~htonl(0xff << 20); 630 ip6->ip6_flow |= htonl((uint32_t)itos << 20); 631 632 pktlen = m->m_pkthdr.len; 633 m->m_pkthdr.rcvif = ifp; 634 635 bpf_mtap_af(ifp, AF_INET6, m); 636 637 /* 638 * Put the packet to the network layer input queue according to the 639 * specified address family. 640 * See net/if_gif.c for possible issues with packet processing 641 * reorder due to extra queueing. 642 */ 643 644 s = splnet(); 645 if (__predict_true(pktq_enqueue(ip6_pktq, m, 0))) { 646 ifp->if_ipackets++; 647 ifp->if_ibytes += pktlen; 648 } else { 649 m_freem(m); 650 } 651 splx(s); 652 } 653 654 /* ARGSUSED */ 655 static void 656 stf_rtrequest(int cmd, struct rtentry *rt, 657 const struct rt_addrinfo *info) 658 { 659 if (rt != NULL) { 660 struct stf_softc *sc; 661 662 sc = LIST_FIRST(&stf_softc_list); 663 rt->rt_rmx.rmx_mtu = (sc != NULL) ? sc->sc_if.if_mtu : STF_MTU; 664 } 665 } 666 667 static int 668 stf_ioctl(struct ifnet *ifp, u_long cmd, void *data) 669 { 670 struct ifaddr *ifa; 671 struct ifreq *ifr = data; 672 struct sockaddr_in6 *sin6; 673 int error; 674 675 error = 0; 676 switch (cmd) { 677 case SIOCINITIFADDR: 678 ifa = (struct ifaddr *)data; 679 if (ifa == NULL || ifa->ifa_addr->sa_family != AF_INET6) { 680 error = EAFNOSUPPORT; 681 break; 682 } 683 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 684 if (IN6_IS_ADDR_6TO4(&sin6->sin6_addr) && 685 !isrfc1918addr(GET_V4(&sin6->sin6_addr))) { 686 ifa->ifa_rtrequest = stf_rtrequest; 687 ifp->if_flags |= IFF_UP; 688 } else 689 error = EINVAL; 690 break; 691 692 case SIOCADDMULTI: 693 case SIOCDELMULTI: 694 if (ifr != NULL && 695 ifreq_getaddr(cmd, ifr)->sa_family == AF_INET6) 696 ; 697 else 698 error = EAFNOSUPPORT; 699 break; 700 701 case SIOCSIFMTU: 702 if (ifr->ifr_mtu < STF_MTU_MIN || ifr->ifr_mtu > STF_MTU_MAX) 703 return EINVAL; 704 else if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 705 error = 0; 706 break; 707 708 default: 709 error = ifioctl_common(ifp, cmd, data); 710 break; 711 } 712 713 return error; 714 } 715