1 /* $NetBSD: if_stf.c,v 1.96 2016/07/08 04:33:30 ozaki-r 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 1.96 2016/07/08 04:33:30 ozaki-r 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/queue.h> 97 #include <sys/syslog.h> 98 99 #include <sys/cpu.h> 100 101 #include <net/if.h> 102 #include <net/route.h> 103 #include <net/netisr.h> 104 #include <net/if_types.h> 105 #include <net/if_stf.h> 106 107 #include <netinet/in.h> 108 #include <netinet/in_systm.h> 109 #include <netinet/ip.h> 110 #include <netinet/ip_var.h> 111 #include <netinet/in_var.h> 112 113 #include <netinet/ip6.h> 114 #include <netinet6/ip6_var.h> 115 #include <netinet6/in6_gif.h> 116 #include <netinet6/in6_var.h> 117 #include <netinet/ip_ecn.h> 118 119 #include <netinet/ip_encap.h> 120 121 #include <net/net_osdep.h> 122 123 #include "stf.h" 124 #include "gif.h" /*XXX*/ 125 126 #include <net/bpf.h> 127 128 #if NGIF > 0 129 #include <net/if_gif.h> 130 #endif 131 132 #include "ioconf.h" 133 134 #define IN6_IS_ADDR_6TO4(x) (ntohs((x)->s6_addr16[0]) == 0x2002) 135 #define GET_V4(x) ((const struct in_addr *)(&(x)->s6_addr16[1])) 136 137 struct stf_softc { 138 struct ifnet sc_if; /* common area */ 139 struct route sc_ro; 140 const struct encaptab *encap_cookie; 141 LIST_ENTRY(stf_softc) sc_list; 142 }; 143 144 static LIST_HEAD(, stf_softc) stf_softc_list; 145 146 static int stf_clone_create(struct if_clone *, int); 147 static int stf_clone_destroy(struct ifnet *); 148 149 struct if_clone stf_cloner = 150 IF_CLONE_INITIALIZER("stf", stf_clone_create, stf_clone_destroy); 151 152 #if NGIF > 0 153 extern int ip_gif_ttl; /*XXX*/ 154 #else 155 static int ip_gif_ttl = 40; /*XXX*/ 156 #endif 157 158 extern struct domain inetdomain; 159 160 static const struct encapsw in_stf_encapsw = 161 { 162 .encapsw4 = { 163 .pr_input = in_stf_input, 164 .pr_ctlinput = NULL, 165 } 166 }; 167 168 static int stf_encapcheck(struct mbuf *, int, int, void *); 169 static struct in6_ifaddr *stf_getsrcifa6(struct ifnet *); 170 static int stf_output(struct ifnet *, struct mbuf *, const struct sockaddr *, 171 const struct rtentry *); 172 static int isrfc1918addr(const struct in_addr *); 173 static int stf_checkaddr4(struct stf_softc *, const struct in_addr *, 174 struct ifnet *); 175 static int stf_checkaddr6(struct stf_softc *, const struct in6_addr *, 176 struct ifnet *); 177 static void stf_rtrequest(int, struct rtentry *, const struct rt_addrinfo *); 178 static int stf_ioctl(struct ifnet *, u_long, void *); 179 180 /* ARGSUSED */ 181 void 182 stfattach(int count) 183 { 184 185 LIST_INIT(&stf_softc_list); 186 if_clone_attach(&stf_cloner); 187 } 188 189 static int 190 stf_clone_create(struct if_clone *ifc, int unit) 191 { 192 struct stf_softc *sc; 193 int error; 194 195 sc = malloc(sizeof(struct stf_softc), M_DEVBUF, M_WAIT|M_ZERO); 196 if_initname(&sc->sc_if, ifc->ifc_name, unit); 197 198 error = encap_lock_enter(); 199 if (error) { 200 free(sc, M_DEVBUF); 201 return error; 202 } 203 204 if (LIST_FIRST(&stf_softc_list) != NULL) { 205 /* Only one stf interface is allowed. */ 206 encap_lock_exit(); 207 free(sc, M_DEVBUF); 208 return (EEXIST); 209 } 210 211 sc->encap_cookie = encap_attach_func(AF_INET, IPPROTO_IPV6, 212 stf_encapcheck, &in_stf_encapsw, sc); 213 encap_lock_exit(); 214 if (sc->encap_cookie == NULL) { 215 printf("%s: unable to attach encap\n", if_name(&sc->sc_if)); 216 free(sc, M_DEVBUF); 217 return (EIO); /* XXX */ 218 } 219 220 sc->sc_if.if_mtu = STF_MTU; 221 sc->sc_if.if_flags = 0; 222 sc->sc_if.if_ioctl = stf_ioctl; 223 sc->sc_if.if_output = stf_output; 224 sc->sc_if.if_type = IFT_STF; 225 sc->sc_if.if_dlt = DLT_NULL; 226 if_attach(&sc->sc_if); 227 if_alloc_sadl(&sc->sc_if); 228 bpf_attach(&sc->sc_if, DLT_NULL, sizeof(u_int)); 229 LIST_INSERT_HEAD(&stf_softc_list, sc, sc_list); 230 return (0); 231 } 232 233 static int 234 stf_clone_destroy(struct ifnet *ifp) 235 { 236 struct stf_softc *sc = (void *) ifp; 237 238 encap_lock_enter(); 239 LIST_REMOVE(sc, sc_list); 240 encap_detach(sc->encap_cookie); 241 encap_lock_exit(); 242 bpf_detach(ifp); 243 if_detach(ifp); 244 rtcache_free(&sc->sc_ro); 245 free(sc, M_DEVBUF); 246 247 return (0); 248 } 249 250 static int 251 stf_encapcheck(struct mbuf *m, int off, int proto, void *arg) 252 { 253 struct ip ip; 254 struct in6_ifaddr *ia6; 255 struct stf_softc *sc; 256 struct in_addr a, b; 257 258 sc = (struct stf_softc *)arg; 259 if (sc == NULL) 260 return 0; 261 262 if ((sc->sc_if.if_flags & IFF_UP) == 0) 263 return 0; 264 265 /* IFF_LINK0 means "no decapsulation" */ 266 if ((sc->sc_if.if_flags & IFF_LINK0) != 0) 267 return 0; 268 269 if (proto != IPPROTO_IPV6) 270 return 0; 271 272 m_copydata(m, 0, sizeof(ip), (void *)&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 (memcmp(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 memset(&a, 0, 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(struct ifnet *ifp) 310 { 311 struct ifaddr *ifa; 312 struct in_ifaddr *ia4; 313 struct sockaddr_in6 *sin6; 314 struct in_addr in; 315 316 IFADDR_READER_FOREACH(ifa, ifp) 317 { 318 if (ifa->ifa_addr->sa_family != AF_INET6) 319 continue; 320 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 321 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) 322 continue; 323 324 memcpy(&in, GET_V4(&sin6->sin6_addr), sizeof(in)); 325 ia4 = in_get_ia(in); 326 if (ia4 == NULL) 327 continue; 328 329 return (struct in6_ifaddr *)ifa; 330 } 331 332 return NULL; 333 } 334 335 static int 336 stf_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 337 const struct rtentry *rt0) 338 { 339 struct rtentry *rt; 340 struct stf_softc *sc; 341 const struct sockaddr_in6 *dst6; 342 const struct in_addr *in4; 343 uint8_t tos; 344 struct ip *ip; 345 struct ip6_hdr *ip6; 346 struct in6_ifaddr *ia6; 347 union { 348 struct sockaddr dst; 349 struct sockaddr_in dst4; 350 } u; 351 352 sc = (struct stf_softc*)ifp; 353 dst6 = (const struct sockaddr_in6 *)dst; 354 355 /* just in case */ 356 if ((ifp->if_flags & IFF_UP) == 0) { 357 m_freem(m); 358 return ENETDOWN; 359 } 360 361 /* 362 * If we don't have an ip4 address that match my inner ip6 address, 363 * we shouldn't generate output. Without this check, we'll end up 364 * using wrong IPv4 source. 365 */ 366 ia6 = stf_getsrcifa6(ifp); 367 if (ia6 == NULL) { 368 m_freem(m); 369 ifp->if_oerrors++; 370 return ENETDOWN; 371 } 372 373 if (m->m_len < sizeof(*ip6)) { 374 m = m_pullup(m, sizeof(*ip6)); 375 if (m == NULL) { 376 ifp->if_oerrors++; 377 return ENOBUFS; 378 } 379 } 380 ip6 = mtod(m, struct ip6_hdr *); 381 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 382 383 /* 384 * Pickup the right outer dst addr from the list of candidates. 385 * ip6_dst has priority as it may be able to give us shorter IPv4 hops. 386 */ 387 if (IN6_IS_ADDR_6TO4(&ip6->ip6_dst)) 388 in4 = GET_V4(&ip6->ip6_dst); 389 else if (IN6_IS_ADDR_6TO4(&dst6->sin6_addr)) 390 in4 = GET_V4(&dst6->sin6_addr); 391 else { 392 m_freem(m); 393 ifp->if_oerrors++; 394 return ENETUNREACH; 395 } 396 397 bpf_mtap_af(ifp, AF_INET6, m); 398 399 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 400 if (m && m->m_len < sizeof(struct ip)) 401 m = m_pullup(m, sizeof(struct ip)); 402 if (m == NULL) { 403 ifp->if_oerrors++; 404 return ENOBUFS; 405 } 406 ip = mtod(m, struct ip *); 407 408 memset(ip, 0, sizeof(*ip)); 409 410 bcopy(GET_V4(&((struct sockaddr_in6 *)&ia6->ia_addr)->sin6_addr), 411 &ip->ip_src, sizeof(ip->ip_src)); 412 memcpy(&ip->ip_dst, in4, sizeof(ip->ip_dst)); 413 ip->ip_p = IPPROTO_IPV6; 414 ip->ip_ttl = ip_gif_ttl; /*XXX*/ 415 ip->ip_len = htons(m->m_pkthdr.len); 416 if (ifp->if_flags & IFF_LINK1) 417 ip_ecn_ingress(ECN_ALLOWED, &ip->ip_tos, &tos); 418 else 419 ip_ecn_ingress(ECN_NOCARE, &ip->ip_tos, &tos); 420 421 sockaddr_in_init(&u.dst4, &ip->ip_dst, 0); 422 if ((rt = rtcache_lookup(&sc->sc_ro, &u.dst)) == NULL) { 423 m_freem(m); 424 ifp->if_oerrors++; 425 return ENETUNREACH; 426 } 427 428 /* If the route constitutes infinite encapsulation, punt. */ 429 if (rt->rt_ifp == ifp) { 430 rtcache_free(&sc->sc_ro); 431 m_freem(m); 432 ifp->if_oerrors++; 433 return ENETUNREACH; 434 } 435 436 ifp->if_opackets++; 437 ifp->if_obytes += m->m_pkthdr.len - sizeof(struct ip); 438 return ip_output(m, NULL, &sc->sc_ro, 0, NULL, NULL); 439 } 440 441 static int 442 isrfc1918addr(const struct in_addr *in) 443 { 444 /* 445 * returns 1 if private address range: 446 * 10.0.0.0/8 172.16.0.0/12 192.168.0.0/16 447 */ 448 if ((ntohl(in->s_addr) & 0xff000000) >> 24 == 10 || 449 (ntohl(in->s_addr) & 0xfff00000) >> 16 == 172 * 256 + 16 || 450 (ntohl(in->s_addr) & 0xffff0000) >> 16 == 192 * 256 + 168) 451 return 1; 452 453 return 0; 454 } 455 456 static int 457 stf_checkaddr4(struct stf_softc *sc, const struct in_addr *in, 458 struct ifnet *inifp /*incoming interface*/) 459 { 460 struct in_ifaddr *ia4; 461 462 /* 463 * reject packets with the following address: 464 * 224.0.0.0/4 0.0.0.0/8 127.0.0.0/8 255.0.0.0/8 465 */ 466 if (IN_MULTICAST(in->s_addr)) 467 return -1; 468 switch ((ntohl(in->s_addr) & 0xff000000) >> 24) { 469 case 0: case 127: case 255: 470 return -1; 471 } 472 473 /* 474 * reject packets with private address range. 475 * (requirement from RFC3056 section 2 1st paragraph) 476 */ 477 if (isrfc1918addr(in)) 478 return -1; 479 480 /* 481 * reject packet with IPv4 link-local (169.254.0.0/16), 482 * as suggested in draft-savola-v6ops-6to4-security-00.txt 483 */ 484 if (((ntohl(in->s_addr) & 0xff000000) >> 24) == 169 && 485 ((ntohl(in->s_addr) & 0x00ff0000) >> 16) == 254) 486 return -1; 487 488 /* 489 * reject packets with broadcast 490 */ 491 IN_ADDRLIST_READER_FOREACH(ia4) { 492 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0) 493 continue; 494 if (in->s_addr == ia4->ia_broadaddr.sin_addr.s_addr) 495 return -1; 496 } 497 498 /* 499 * perform ingress filter 500 */ 501 if (sc && (sc->sc_if.if_flags & IFF_LINK2) == 0 && inifp) { 502 struct sockaddr_in sin; 503 struct rtentry *rt; 504 505 memset(&sin, 0, sizeof(sin)); 506 sin.sin_family = AF_INET; 507 sin.sin_len = sizeof(struct sockaddr_in); 508 sin.sin_addr = *in; 509 rt = rtalloc1((struct sockaddr *)&sin, 0); 510 if (!rt || rt->rt_ifp != inifp) { 511 #if 0 512 log(LOG_WARNING, "%s: packet from 0x%x dropped " 513 "due to ingress filter\n", if_name(&sc->sc_if), 514 (uint32_t)ntohl(sin.sin_addr.s_addr)); 515 #endif 516 if (rt) 517 rtfree(rt); 518 return -1; 519 } 520 rtfree(rt); 521 } 522 523 return 0; 524 } 525 526 static int 527 stf_checkaddr6(struct stf_softc *sc, const struct in6_addr *in6, 528 struct ifnet *inifp /*incoming interface*/) 529 { 530 531 /* 532 * check 6to4 addresses 533 */ 534 if (IN6_IS_ADDR_6TO4(in6)) 535 return stf_checkaddr4(sc, GET_V4(in6), inifp); 536 537 /* 538 * reject anything that look suspicious. the test is implemented 539 * in ip6_input too, but we check here as well to 540 * (1) reject bad packets earlier, and 541 * (2) to be safe against future ip6_input change. 542 */ 543 if (IN6_IS_ADDR_V4COMPAT(in6) || IN6_IS_ADDR_V4MAPPED(in6)) 544 return -1; 545 546 /* 547 * reject link-local and site-local unicast 548 * as suggested in draft-savola-v6ops-6to4-security-00.txt 549 */ 550 if (IN6_IS_ADDR_LINKLOCAL(in6) || IN6_IS_ADDR_SITELOCAL(in6)) 551 return -1; 552 553 /* 554 * reject node-local and link-local multicast 555 * as suggested in draft-savola-v6ops-6to4-security-00.txt 556 */ 557 if (IN6_IS_ADDR_MC_NODELOCAL(in6) || IN6_IS_ADDR_MC_LINKLOCAL(in6)) 558 return -1; 559 560 return 0; 561 } 562 563 void 564 in_stf_input(struct mbuf *m, int off, int proto) 565 { 566 int s; 567 struct stf_softc *sc; 568 struct ip *ip; 569 struct ip6_hdr *ip6; 570 uint8_t otos, itos; 571 struct ifnet *ifp; 572 size_t pktlen; 573 574 if (proto != IPPROTO_IPV6) { 575 m_freem(m); 576 return; 577 } 578 579 ip = mtod(m, struct ip *); 580 581 sc = (struct stf_softc *)encap_getarg(m); 582 583 if (sc == NULL || (sc->sc_if.if_flags & IFF_UP) == 0) { 584 m_freem(m); 585 return; 586 } 587 588 ifp = &sc->sc_if; 589 590 /* 591 * perform sanity check against outer src/dst. 592 * for source, perform ingress filter as well. 593 */ 594 if (stf_checkaddr4(sc, &ip->ip_dst, NULL) < 0 || 595 stf_checkaddr4(sc, &ip->ip_src, m_get_rcvif_NOMPSAFE(m)) < 0) { 596 m_freem(m); 597 return; 598 } 599 600 otos = ip->ip_tos; 601 m_adj(m, off); 602 603 if (m->m_len < sizeof(*ip6)) { 604 m = m_pullup(m, sizeof(*ip6)); 605 if (!m) 606 return; 607 } 608 ip6 = mtod(m, struct ip6_hdr *); 609 610 /* 611 * perform sanity check against inner src/dst. 612 * for source, perform ingress filter as well. 613 */ 614 if (stf_checkaddr6(sc, &ip6->ip6_dst, NULL) < 0 || 615 stf_checkaddr6(sc, &ip6->ip6_src, m_get_rcvif_NOMPSAFE(m)) < 0) { 616 m_freem(m); 617 return; 618 } 619 620 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 621 if ((ifp->if_flags & IFF_LINK1) != 0) 622 ip_ecn_egress(ECN_ALLOWED, &otos, &itos); 623 else 624 ip_ecn_egress(ECN_NOCARE, &otos, &itos); 625 ip6->ip6_flow &= ~htonl(0xff << 20); 626 ip6->ip6_flow |= htonl((uint32_t)itos << 20); 627 628 pktlen = m->m_pkthdr.len; 629 m_set_rcvif(m, ifp); 630 631 bpf_mtap_af(ifp, AF_INET6, m); 632 633 /* 634 * Put the packet to the network layer input queue according to the 635 * specified address family. 636 * See net/if_gif.c for possible issues with packet processing 637 * reorder due to extra queueing. 638 */ 639 640 s = splnet(); 641 if (__predict_true(pktq_enqueue(ip6_pktq, m, 0))) { 642 ifp->if_ipackets++; 643 ifp->if_ibytes += pktlen; 644 } else { 645 m_freem(m); 646 } 647 splx(s); 648 649 return; 650 } 651 652 /* ARGSUSED */ 653 static void 654 stf_rtrequest(int cmd, struct rtentry *rt, 655 const struct rt_addrinfo *info) 656 { 657 if (rt != NULL) { 658 struct stf_softc *sc; 659 660 sc = LIST_FIRST(&stf_softc_list); 661 rt->rt_rmx.rmx_mtu = (sc != NULL) ? sc->sc_if.if_mtu : STF_MTU; 662 } 663 } 664 665 static int 666 stf_ioctl(struct ifnet *ifp, u_long cmd, void *data) 667 { 668 struct ifaddr *ifa; 669 struct ifreq *ifr = data; 670 struct sockaddr_in6 *sin6; 671 int error; 672 673 error = 0; 674 switch (cmd) { 675 case SIOCINITIFADDR: 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 !isrfc1918addr(GET_V4(&sin6->sin6_addr))) { 684 ifa->ifa_rtrequest = stf_rtrequest; 685 ifp->if_flags |= IFF_UP; 686 } else 687 error = EINVAL; 688 break; 689 690 case SIOCADDMULTI: 691 case SIOCDELMULTI: 692 if (ifr != NULL && 693 ifreq_getaddr(cmd, ifr)->sa_family == AF_INET6) 694 ; 695 else 696 error = EAFNOSUPPORT; 697 break; 698 699 case SIOCSIFMTU: 700 if (ifr->ifr_mtu < STF_MTU_MIN || ifr->ifr_mtu > STF_MTU_MAX) 701 return EINVAL; 702 else if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 703 error = 0; 704 break; 705 706 default: 707 error = ifioctl_common(ifp, cmd, data); 708 break; 709 } 710 711 return error; 712 } 713