1 /* $NetBSD: if_stf.c,v 1.77 2011/10/28 20:13:32 dyoung 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 1.77 2011/10/28 20:13:32 dyoung Exp $"); 79 80 #include "opt_inet.h" 81 82 #include <sys/param.h> 83 #include <sys/systm.h> 84 #include <sys/socket.h> 85 #include <sys/sockio.h> 86 #include <sys/mbuf.h> 87 #include <sys/errno.h> 88 #include <sys/ioctl.h> 89 #include <sys/proc.h> 90 #include <sys/protosw.h> 91 #include <sys/queue.h> 92 #include <sys/syslog.h> 93 94 #include <sys/cpu.h> 95 96 #include <net/if.h> 97 #include <net/route.h> 98 #include <net/netisr.h> 99 #include <net/if_types.h> 100 #include <net/if_stf.h> 101 102 #include <netinet/in.h> 103 #include <netinet/in_systm.h> 104 #include <netinet/ip.h> 105 #include <netinet/ip_var.h> 106 #include <netinet/in_var.h> 107 108 #include <netinet/ip6.h> 109 #include <netinet6/ip6_var.h> 110 #include <netinet6/in6_gif.h> 111 #include <netinet6/in6_var.h> 112 #include <netinet/ip_ecn.h> 113 114 #include <netinet/ip_encap.h> 115 116 #include <net/net_osdep.h> 117 118 #include "stf.h" 119 #include "gif.h" /*XXX*/ 120 121 #include <net/bpf.h> 122 123 #if NGIF > 0 124 #include <net/if_gif.h> 125 #endif 126 127 #define IN6_IS_ADDR_6TO4(x) (ntohs((x)->s6_addr16[0]) == 0x2002) 128 #define GET_V4(x) ((const struct in_addr *)(&(x)->s6_addr16[1])) 129 130 struct stf_softc { 131 struct ifnet sc_if; /* common area */ 132 struct route sc_ro; 133 const struct encaptab *encap_cookie; 134 LIST_ENTRY(stf_softc) sc_list; 135 }; 136 137 static LIST_HEAD(, stf_softc) stf_softc_list; 138 139 static int stf_clone_create(struct if_clone *, int); 140 static int stf_clone_destroy(struct ifnet *); 141 142 struct if_clone stf_cloner = 143 IF_CLONE_INITIALIZER("stf", stf_clone_create, stf_clone_destroy); 144 145 #if NGIF > 0 146 extern int ip_gif_ttl; /*XXX*/ 147 #else 148 static int ip_gif_ttl = 40; /*XXX*/ 149 #endif 150 151 extern struct domain inetdomain; 152 static const struct protosw in_stf_protosw = 153 { SOCK_RAW, &inetdomain, IPPROTO_IPV6, PR_ATOMIC|PR_ADDR, 154 in_stf_input, rip_output, 0, rip_ctloutput, 155 rip_usrreq, 156 0, 0, 0, 0 157 }; 158 159 void stfattach(int); 160 161 static int stf_encapcheck(struct mbuf *, int, int, void *); 162 static struct in6_ifaddr *stf_getsrcifa6(struct ifnet *); 163 static int stf_output(struct ifnet *, struct mbuf *, const struct sockaddr *, 164 struct rtentry *); 165 static int isrfc1918addr(const struct in_addr *); 166 static int stf_checkaddr4(struct stf_softc *, const struct in_addr *, 167 struct ifnet *); 168 static int stf_checkaddr6(struct stf_softc *, const struct in6_addr *, 169 struct ifnet *); 170 static void stf_rtrequest(int, struct rtentry *, const struct rt_addrinfo *); 171 static int stf_ioctl(struct ifnet *, u_long, void *); 172 173 /* ARGSUSED */ 174 void 175 stfattach(int count) 176 { 177 178 LIST_INIT(&stf_softc_list); 179 if_clone_attach(&stf_cloner); 180 } 181 182 static int 183 stf_clone_create(struct if_clone *ifc, int unit) 184 { 185 struct stf_softc *sc; 186 187 if (LIST_FIRST(&stf_softc_list) != NULL) { 188 /* Only one stf interface is allowed. */ 189 return (EEXIST); 190 } 191 192 sc = malloc(sizeof(struct stf_softc), M_DEVBUF, M_WAIT|M_ZERO); 193 194 if_initname(&sc->sc_if, ifc->ifc_name, unit); 195 196 sc->encap_cookie = encap_attach_func(AF_INET, IPPROTO_IPV6, 197 stf_encapcheck, &in_stf_protosw, sc); 198 if (sc->encap_cookie == NULL) { 199 printf("%s: unable to attach encap\n", if_name(&sc->sc_if)); 200 free(sc, M_DEVBUF); 201 return (EIO); /* XXX */ 202 } 203 204 sc->sc_if.if_mtu = STF_MTU; 205 sc->sc_if.if_flags = 0; 206 sc->sc_if.if_ioctl = stf_ioctl; 207 sc->sc_if.if_output = stf_output; 208 sc->sc_if.if_type = IFT_STF; 209 sc->sc_if.if_dlt = DLT_NULL; 210 if_attach(&sc->sc_if); 211 if_alloc_sadl(&sc->sc_if); 212 bpf_attach(&sc->sc_if, DLT_NULL, sizeof(u_int)); 213 LIST_INSERT_HEAD(&stf_softc_list, sc, sc_list); 214 return (0); 215 } 216 217 static int 218 stf_clone_destroy(struct ifnet *ifp) 219 { 220 struct stf_softc *sc = (void *) ifp; 221 222 LIST_REMOVE(sc, sc_list); 223 encap_detach(sc->encap_cookie); 224 bpf_detach(ifp); 225 if_detach(ifp); 226 rtcache_free(&sc->sc_ro); 227 free(sc, M_DEVBUF); 228 229 return (0); 230 } 231 232 static int 233 stf_encapcheck(struct mbuf *m, int off, int proto, void *arg) 234 { 235 struct ip ip; 236 struct in6_ifaddr *ia6; 237 struct stf_softc *sc; 238 struct in_addr a, b; 239 240 sc = (struct stf_softc *)arg; 241 if (sc == NULL) 242 return 0; 243 244 if ((sc->sc_if.if_flags & IFF_UP) == 0) 245 return 0; 246 247 /* IFF_LINK0 means "no decapsulation" */ 248 if ((sc->sc_if.if_flags & IFF_LINK0) != 0) 249 return 0; 250 251 if (proto != IPPROTO_IPV6) 252 return 0; 253 254 m_copydata(m, 0, sizeof(ip), (void *)&ip); 255 256 if (ip.ip_v != 4) 257 return 0; 258 259 ia6 = stf_getsrcifa6(&sc->sc_if); 260 if (ia6 == NULL) 261 return 0; 262 263 /* 264 * check if IPv4 dst matches the IPv4 address derived from the 265 * local 6to4 address. 266 * success on: dst = 10.1.1.1, ia6->ia_addr = 2002:0a01:0101:... 267 */ 268 if (memcmp(GET_V4(&ia6->ia_addr.sin6_addr), &ip.ip_dst, 269 sizeof(ip.ip_dst)) != 0) 270 return 0; 271 272 /* 273 * check if IPv4 src matches the IPv4 address derived from the 274 * local 6to4 address masked by prefixmask. 275 * success on: src = 10.1.1.1, ia6->ia_addr = 2002:0a00:.../24 276 * fail on: src = 10.1.1.1, ia6->ia_addr = 2002:0b00:.../24 277 */ 278 memset(&a, 0, sizeof(a)); 279 a.s_addr = GET_V4(&ia6->ia_addr.sin6_addr)->s_addr; 280 a.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 281 b = ip.ip_src; 282 b.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 283 if (a.s_addr != b.s_addr) 284 return 0; 285 286 /* stf interface makes single side match only */ 287 return 32; 288 } 289 290 static struct in6_ifaddr * 291 stf_getsrcifa6(struct ifnet *ifp) 292 { 293 struct ifaddr *ifa; 294 struct in_ifaddr *ia4; 295 struct sockaddr_in6 *sin6; 296 struct in_addr in; 297 298 IFADDR_FOREACH(ifa, ifp) 299 { 300 if (ifa->ifa_addr == NULL) 301 continue; 302 if (ifa->ifa_addr->sa_family != AF_INET6) 303 continue; 304 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 305 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) 306 continue; 307 308 memcpy(&in, GET_V4(&sin6->sin6_addr), sizeof(in)); 309 INADDR_TO_IA(in, ia4); 310 if (ia4 == NULL) 311 continue; 312 313 return (struct in6_ifaddr *)ifa; 314 } 315 316 return NULL; 317 } 318 319 static int 320 stf_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 321 struct rtentry *rt0) 322 { 323 struct rtentry *rt; 324 struct stf_softc *sc; 325 const struct sockaddr_in6 *dst6; 326 const struct in_addr *in4; 327 uint8_t tos; 328 struct ip *ip; 329 struct ip6_hdr *ip6; 330 struct in6_ifaddr *ia6; 331 union { 332 struct sockaddr dst; 333 struct sockaddr_in dst4; 334 } u; 335 336 sc = (struct stf_softc*)ifp; 337 dst6 = (const struct sockaddr_in6 *)dst; 338 339 /* just in case */ 340 if ((ifp->if_flags & IFF_UP) == 0) { 341 m_freem(m); 342 return ENETDOWN; 343 } 344 345 /* 346 * If we don't have an ip4 address that match my inner ip6 address, 347 * we shouldn't generate output. Without this check, we'll end up 348 * using wrong IPv4 source. 349 */ 350 ia6 = stf_getsrcifa6(ifp); 351 if (ia6 == NULL) { 352 m_freem(m); 353 ifp->if_oerrors++; 354 return ENETDOWN; 355 } 356 357 if (m->m_len < sizeof(*ip6)) { 358 m = m_pullup(m, sizeof(*ip6)); 359 if (m == NULL) { 360 ifp->if_oerrors++; 361 return ENOBUFS; 362 } 363 } 364 ip6 = mtod(m, struct ip6_hdr *); 365 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 366 367 /* 368 * Pickup the right outer dst addr from the list of candidates. 369 * ip6_dst has priority as it may be able to give us shorter IPv4 hops. 370 */ 371 if (IN6_IS_ADDR_6TO4(&ip6->ip6_dst)) 372 in4 = GET_V4(&ip6->ip6_dst); 373 else if (IN6_IS_ADDR_6TO4(&dst6->sin6_addr)) 374 in4 = GET_V4(&dst6->sin6_addr); 375 else { 376 m_freem(m); 377 ifp->if_oerrors++; 378 return ENETUNREACH; 379 } 380 381 bpf_mtap_af(ifp, AF_INET6, m); 382 383 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 384 if (m && m->m_len < sizeof(struct ip)) 385 m = m_pullup(m, sizeof(struct ip)); 386 if (m == NULL) { 387 ifp->if_oerrors++; 388 return ENOBUFS; 389 } 390 ip = mtod(m, struct ip *); 391 392 memset(ip, 0, sizeof(*ip)); 393 394 bcopy(GET_V4(&((struct sockaddr_in6 *)&ia6->ia_addr)->sin6_addr), 395 &ip->ip_src, sizeof(ip->ip_src)); 396 memcpy(&ip->ip_dst, in4, sizeof(ip->ip_dst)); 397 ip->ip_p = IPPROTO_IPV6; 398 ip->ip_ttl = ip_gif_ttl; /*XXX*/ 399 ip->ip_len = htons(m->m_pkthdr.len); 400 if (ifp->if_flags & IFF_LINK1) 401 ip_ecn_ingress(ECN_ALLOWED, &ip->ip_tos, &tos); 402 else 403 ip_ecn_ingress(ECN_NOCARE, &ip->ip_tos, &tos); 404 405 sockaddr_in_init(&u.dst4, &ip->ip_dst, 0); 406 if ((rt = rtcache_lookup(&sc->sc_ro, &u.dst)) == NULL) { 407 m_freem(m); 408 ifp->if_oerrors++; 409 return ENETUNREACH; 410 } 411 412 /* If the route constitutes infinite encapsulation, punt. */ 413 if (rt->rt_ifp == ifp) { 414 rtcache_free(&sc->sc_ro); 415 m_freem(m); 416 ifp->if_oerrors++; 417 return ENETUNREACH; 418 } 419 420 ifp->if_opackets++; 421 ifp->if_obytes += m->m_pkthdr.len - sizeof(struct ip); 422 return ip_output(m, NULL, &sc->sc_ro, 0, NULL, NULL); 423 } 424 425 static int 426 isrfc1918addr(const struct in_addr *in) 427 { 428 /* 429 * returns 1 if private address range: 430 * 10.0.0.0/8 172.16.0.0/12 192.168.0.0/16 431 */ 432 if ((ntohl(in->s_addr) & 0xff000000) >> 24 == 10 || 433 (ntohl(in->s_addr) & 0xfff00000) >> 16 == 172 * 256 + 16 || 434 (ntohl(in->s_addr) & 0xffff0000) >> 16 == 192 * 256 + 168) 435 return 1; 436 437 return 0; 438 } 439 440 static int 441 stf_checkaddr4(struct stf_softc *sc, const struct in_addr *in, 442 struct ifnet *inifp /*incoming interface*/) 443 { 444 struct in_ifaddr *ia4; 445 446 /* 447 * reject packets with the following address: 448 * 224.0.0.0/4 0.0.0.0/8 127.0.0.0/8 255.0.0.0/8 449 */ 450 if (IN_MULTICAST(in->s_addr)) 451 return -1; 452 switch ((ntohl(in->s_addr) & 0xff000000) >> 24) { 453 case 0: case 127: case 255: 454 return -1; 455 } 456 457 /* 458 * reject packets with private address range. 459 * (requirement from RFC3056 section 2 1st paragraph) 460 */ 461 if (isrfc1918addr(in)) 462 return -1; 463 464 /* 465 * reject packet with IPv4 link-local (169.254.0.0/16), 466 * as suggested in draft-savola-v6ops-6to4-security-00.txt 467 */ 468 if (((ntohl(in->s_addr) & 0xff000000) >> 24) == 169 && 469 ((ntohl(in->s_addr) & 0x00ff0000) >> 16) == 254) 470 return -1; 471 472 /* 473 * reject packets with broadcast 474 */ 475 TAILQ_FOREACH(ia4, &in_ifaddrhead, ia_list) 476 { 477 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0) 478 continue; 479 if (in->s_addr == ia4->ia_broadaddr.sin_addr.s_addr) 480 return -1; 481 } 482 483 /* 484 * perform ingress filter 485 */ 486 if (sc && (sc->sc_if.if_flags & IFF_LINK2) == 0 && inifp) { 487 struct sockaddr_in sin; 488 struct rtentry *rt; 489 490 memset(&sin, 0, sizeof(sin)); 491 sin.sin_family = AF_INET; 492 sin.sin_len = sizeof(struct sockaddr_in); 493 sin.sin_addr = *in; 494 rt = rtalloc1((struct sockaddr *)&sin, 0); 495 if (!rt || rt->rt_ifp != inifp) { 496 #if 0 497 log(LOG_WARNING, "%s: packet from 0x%x dropped " 498 "due to ingress filter\n", if_name(&sc->sc_if), 499 (uint32_t)ntohl(sin.sin_addr.s_addr)); 500 #endif 501 if (rt) 502 rtfree(rt); 503 return -1; 504 } 505 rtfree(rt); 506 } 507 508 return 0; 509 } 510 511 static int 512 stf_checkaddr6(struct stf_softc *sc, const struct in6_addr *in6, 513 struct ifnet *inifp /*incoming interface*/) 514 { 515 516 /* 517 * check 6to4 addresses 518 */ 519 if (IN6_IS_ADDR_6TO4(in6)) 520 return stf_checkaddr4(sc, GET_V4(in6), inifp); 521 522 /* 523 * reject anything that look suspicious. the test is implemented 524 * in ip6_input too, but we check here as well to 525 * (1) reject bad packets earlier, and 526 * (2) to be safe against future ip6_input change. 527 */ 528 if (IN6_IS_ADDR_V4COMPAT(in6) || IN6_IS_ADDR_V4MAPPED(in6)) 529 return -1; 530 531 /* 532 * reject link-local and site-local unicast 533 * as suggested in draft-savola-v6ops-6to4-security-00.txt 534 */ 535 if (IN6_IS_ADDR_LINKLOCAL(in6) || IN6_IS_ADDR_SITELOCAL(in6)) 536 return -1; 537 538 /* 539 * reject node-local and link-local multicast 540 * as suggested in draft-savola-v6ops-6to4-security-00.txt 541 */ 542 if (IN6_IS_ADDR_MC_NODELOCAL(in6) || IN6_IS_ADDR_MC_LINKLOCAL(in6)) 543 return -1; 544 545 return 0; 546 } 547 548 void 549 in_stf_input(struct mbuf *m, ...) 550 { 551 int off, proto; 552 struct stf_softc *sc; 553 struct ip *ip; 554 struct ip6_hdr *ip6; 555 uint8_t otos, itos; 556 int s, isr; 557 struct ifqueue *ifq = NULL; 558 struct ifnet *ifp; 559 va_list ap; 560 561 va_start(ap, m); 562 off = va_arg(ap, int); 563 proto = va_arg(ap, int); 564 va_end(ap); 565 566 if (proto != IPPROTO_IPV6) { 567 m_freem(m); 568 return; 569 } 570 571 ip = mtod(m, struct ip *); 572 573 sc = (struct stf_softc *)encap_getarg(m); 574 575 if (sc == NULL || (sc->sc_if.if_flags & IFF_UP) == 0) { 576 m_freem(m); 577 return; 578 } 579 580 ifp = &sc->sc_if; 581 582 /* 583 * perform sanity check against outer src/dst. 584 * for source, perform ingress filter as well. 585 */ 586 if (stf_checkaddr4(sc, &ip->ip_dst, NULL) < 0 || 587 stf_checkaddr4(sc, &ip->ip_src, m->m_pkthdr.rcvif) < 0) { 588 m_freem(m); 589 return; 590 } 591 592 otos = ip->ip_tos; 593 m_adj(m, off); 594 595 if (m->m_len < sizeof(*ip6)) { 596 m = m_pullup(m, sizeof(*ip6)); 597 if (!m) 598 return; 599 } 600 ip6 = mtod(m, struct ip6_hdr *); 601 602 /* 603 * perform sanity check against inner src/dst. 604 * for source, perform ingress filter as well. 605 */ 606 if (stf_checkaddr6(sc, &ip6->ip6_dst, NULL) < 0 || 607 stf_checkaddr6(sc, &ip6->ip6_src, m->m_pkthdr.rcvif) < 0) { 608 m_freem(m); 609 return; 610 } 611 612 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 613 if ((ifp->if_flags & IFF_LINK1) != 0) 614 ip_ecn_egress(ECN_ALLOWED, &otos, &itos); 615 else 616 ip_ecn_egress(ECN_NOCARE, &otos, &itos); 617 ip6->ip6_flow &= ~htonl(0xff << 20); 618 ip6->ip6_flow |= htonl((uint32_t)itos << 20); 619 620 m->m_pkthdr.rcvif = ifp; 621 622 bpf_mtap_af(ifp, AF_INET6, m); 623 624 /* 625 * Put the packet to the network layer input queue according to the 626 * specified address family. 627 * See net/if_gif.c for possible issues with packet processing 628 * reorder due to extra queueing. 629 */ 630 ifq = &ip6intrq; 631 isr = NETISR_IPV6; 632 633 s = splnet(); 634 if (IF_QFULL(ifq)) { 635 IF_DROP(ifq); /* update statistics */ 636 m_freem(m); 637 splx(s); 638 return; 639 } 640 IF_ENQUEUE(ifq, m); 641 schednetisr(isr); 642 ifp->if_ipackets++; 643 ifp->if_ibytes += m->m_pkthdr.len; 644 splx(s); 645 } 646 647 /* ARGSUSED */ 648 static void 649 stf_rtrequest(int cmd, struct rtentry *rt, 650 const struct rt_addrinfo *info) 651 { 652 if (rt != NULL) { 653 struct stf_softc *sc; 654 655 sc = LIST_FIRST(&stf_softc_list); 656 rt->rt_rmx.rmx_mtu = (sc != NULL) ? sc->sc_if.if_mtu : STF_MTU; 657 } 658 } 659 660 static int 661 stf_ioctl(struct ifnet *ifp, u_long cmd, void *data) 662 { 663 struct ifaddr *ifa; 664 struct ifreq *ifr = data; 665 struct sockaddr_in6 *sin6; 666 int error; 667 668 error = 0; 669 switch (cmd) { 670 case SIOCINITIFADDR: 671 ifa = (struct ifaddr *)data; 672 if (ifa == NULL || ifa->ifa_addr->sa_family != AF_INET6) { 673 error = EAFNOSUPPORT; 674 break; 675 } 676 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 677 if (IN6_IS_ADDR_6TO4(&sin6->sin6_addr) && 678 !isrfc1918addr(GET_V4(&sin6->sin6_addr))) { 679 ifa->ifa_rtrequest = stf_rtrequest; 680 ifp->if_flags |= IFF_UP; 681 } else 682 error = EINVAL; 683 break; 684 685 case SIOCADDMULTI: 686 case SIOCDELMULTI: 687 if (ifr != NULL && 688 ifreq_getaddr(cmd, ifr)->sa_family == AF_INET6) 689 ; 690 else 691 error = EAFNOSUPPORT; 692 break; 693 694 case SIOCSIFMTU: 695 if (ifr->ifr_mtu < STF_MTU_MIN || ifr->ifr_mtu > STF_MTU_MAX) 696 return EINVAL; 697 else if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 698 error = 0; 699 break; 700 701 default: 702 error = ifioctl_common(ifp, cmd, data); 703 break; 704 } 705 706 return error; 707 } 708