1 /* $NetBSD: if_stf.c,v 1.78 2014/05/18 14:46:16 rmind 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 1.78 2014/05/18 14:46:16 rmind 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; 152 153 static const struct protosw in_stf_protosw = 154 { 155 .pr_type = SOCK_RAW, 156 .pr_domain = &inetdomain, 157 .pr_protocol = IPPROTO_IPV6, 158 .pr_flags = PR_ATOMIC|PR_ADDR, 159 .pr_input = in_stf_input, 160 .pr_output = rip_output, 161 .pr_ctlinput = NULL, 162 .pr_ctloutput = rip_ctloutput, 163 .pr_usrreqs = &rip_usrreqs, 164 }; 165 166 void stfattach(int); 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 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; 193 194 if (LIST_FIRST(&stf_softc_list) != NULL) { 195 /* Only one stf interface is allowed. */ 196 return (EEXIST); 197 } 198 199 sc = malloc(sizeof(struct stf_softc), M_DEVBUF, M_WAIT|M_ZERO); 200 201 if_initname(&sc->sc_if, ifc->ifc_name, unit); 202 203 sc->encap_cookie = encap_attach_func(AF_INET, IPPROTO_IPV6, 204 stf_encapcheck, &in_stf_protosw, sc); 205 if (sc->encap_cookie == NULL) { 206 printf("%s: unable to attach encap\n", if_name(&sc->sc_if)); 207 free(sc, M_DEVBUF); 208 return (EIO); /* XXX */ 209 } 210 211 sc->sc_if.if_mtu = STF_MTU; 212 sc->sc_if.if_flags = 0; 213 sc->sc_if.if_ioctl = stf_ioctl; 214 sc->sc_if.if_output = stf_output; 215 sc->sc_if.if_type = IFT_STF; 216 sc->sc_if.if_dlt = DLT_NULL; 217 if_attach(&sc->sc_if); 218 if_alloc_sadl(&sc->sc_if); 219 bpf_attach(&sc->sc_if, DLT_NULL, sizeof(u_int)); 220 LIST_INSERT_HEAD(&stf_softc_list, sc, sc_list); 221 return (0); 222 } 223 224 static int 225 stf_clone_destroy(struct ifnet *ifp) 226 { 227 struct stf_softc *sc = (void *) ifp; 228 229 LIST_REMOVE(sc, sc_list); 230 encap_detach(sc->encap_cookie); 231 bpf_detach(ifp); 232 if_detach(ifp); 233 rtcache_free(&sc->sc_ro); 234 free(sc, M_DEVBUF); 235 236 return (0); 237 } 238 239 static int 240 stf_encapcheck(struct mbuf *m, int off, int proto, void *arg) 241 { 242 struct ip ip; 243 struct in6_ifaddr *ia6; 244 struct stf_softc *sc; 245 struct in_addr a, b; 246 247 sc = (struct stf_softc *)arg; 248 if (sc == NULL) 249 return 0; 250 251 if ((sc->sc_if.if_flags & IFF_UP) == 0) 252 return 0; 253 254 /* IFF_LINK0 means "no decapsulation" */ 255 if ((sc->sc_if.if_flags & IFF_LINK0) != 0) 256 return 0; 257 258 if (proto != IPPROTO_IPV6) 259 return 0; 260 261 m_copydata(m, 0, sizeof(ip), (void *)&ip); 262 263 if (ip.ip_v != 4) 264 return 0; 265 266 ia6 = stf_getsrcifa6(&sc->sc_if); 267 if (ia6 == NULL) 268 return 0; 269 270 /* 271 * check if IPv4 dst matches the IPv4 address derived from the 272 * local 6to4 address. 273 * success on: dst = 10.1.1.1, ia6->ia_addr = 2002:0a01:0101:... 274 */ 275 if (memcmp(GET_V4(&ia6->ia_addr.sin6_addr), &ip.ip_dst, 276 sizeof(ip.ip_dst)) != 0) 277 return 0; 278 279 /* 280 * check if IPv4 src matches the IPv4 address derived from the 281 * local 6to4 address masked by prefixmask. 282 * success on: src = 10.1.1.1, ia6->ia_addr = 2002:0a00:.../24 283 * fail on: src = 10.1.1.1, ia6->ia_addr = 2002:0b00:.../24 284 */ 285 memset(&a, 0, sizeof(a)); 286 a.s_addr = GET_V4(&ia6->ia_addr.sin6_addr)->s_addr; 287 a.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 288 b = ip.ip_src; 289 b.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 290 if (a.s_addr != b.s_addr) 291 return 0; 292 293 /* stf interface makes single side match only */ 294 return 32; 295 } 296 297 static struct in6_ifaddr * 298 stf_getsrcifa6(struct ifnet *ifp) 299 { 300 struct ifaddr *ifa; 301 struct in_ifaddr *ia4; 302 struct sockaddr_in6 *sin6; 303 struct in_addr in; 304 305 IFADDR_FOREACH(ifa, ifp) 306 { 307 if (ifa->ifa_addr == NULL) 308 continue; 309 if (ifa->ifa_addr->sa_family != AF_INET6) 310 continue; 311 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 312 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) 313 continue; 314 315 memcpy(&in, GET_V4(&sin6->sin6_addr), sizeof(in)); 316 INADDR_TO_IA(in, ia4); 317 if (ia4 == NULL) 318 continue; 319 320 return (struct in6_ifaddr *)ifa; 321 } 322 323 return NULL; 324 } 325 326 static int 327 stf_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 328 struct rtentry *rt0) 329 { 330 struct rtentry *rt; 331 struct stf_softc *sc; 332 const struct sockaddr_in6 *dst6; 333 const struct in_addr *in4; 334 uint8_t tos; 335 struct ip *ip; 336 struct ip6_hdr *ip6; 337 struct in6_ifaddr *ia6; 338 union { 339 struct sockaddr dst; 340 struct sockaddr_in dst4; 341 } u; 342 343 sc = (struct stf_softc*)ifp; 344 dst6 = (const struct sockaddr_in6 *)dst; 345 346 /* just in case */ 347 if ((ifp->if_flags & IFF_UP) == 0) { 348 m_freem(m); 349 return ENETDOWN; 350 } 351 352 /* 353 * If we don't have an ip4 address that match my inner ip6 address, 354 * we shouldn't generate output. Without this check, we'll end up 355 * using wrong IPv4 source. 356 */ 357 ia6 = stf_getsrcifa6(ifp); 358 if (ia6 == NULL) { 359 m_freem(m); 360 ifp->if_oerrors++; 361 return ENETDOWN; 362 } 363 364 if (m->m_len < sizeof(*ip6)) { 365 m = m_pullup(m, sizeof(*ip6)); 366 if (m == NULL) { 367 ifp->if_oerrors++; 368 return ENOBUFS; 369 } 370 } 371 ip6 = mtod(m, struct ip6_hdr *); 372 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 373 374 /* 375 * Pickup the right outer dst addr from the list of candidates. 376 * ip6_dst has priority as it may be able to give us shorter IPv4 hops. 377 */ 378 if (IN6_IS_ADDR_6TO4(&ip6->ip6_dst)) 379 in4 = GET_V4(&ip6->ip6_dst); 380 else if (IN6_IS_ADDR_6TO4(&dst6->sin6_addr)) 381 in4 = GET_V4(&dst6->sin6_addr); 382 else { 383 m_freem(m); 384 ifp->if_oerrors++; 385 return ENETUNREACH; 386 } 387 388 bpf_mtap_af(ifp, AF_INET6, m); 389 390 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 391 if (m && m->m_len < sizeof(struct ip)) 392 m = m_pullup(m, sizeof(struct ip)); 393 if (m == NULL) { 394 ifp->if_oerrors++; 395 return ENOBUFS; 396 } 397 ip = mtod(m, struct ip *); 398 399 memset(ip, 0, sizeof(*ip)); 400 401 bcopy(GET_V4(&((struct sockaddr_in6 *)&ia6->ia_addr)->sin6_addr), 402 &ip->ip_src, sizeof(ip->ip_src)); 403 memcpy(&ip->ip_dst, in4, sizeof(ip->ip_dst)); 404 ip->ip_p = IPPROTO_IPV6; 405 ip->ip_ttl = ip_gif_ttl; /*XXX*/ 406 ip->ip_len = htons(m->m_pkthdr.len); 407 if (ifp->if_flags & IFF_LINK1) 408 ip_ecn_ingress(ECN_ALLOWED, &ip->ip_tos, &tos); 409 else 410 ip_ecn_ingress(ECN_NOCARE, &ip->ip_tos, &tos); 411 412 sockaddr_in_init(&u.dst4, &ip->ip_dst, 0); 413 if ((rt = rtcache_lookup(&sc->sc_ro, &u.dst)) == NULL) { 414 m_freem(m); 415 ifp->if_oerrors++; 416 return ENETUNREACH; 417 } 418 419 /* If the route constitutes infinite encapsulation, punt. */ 420 if (rt->rt_ifp == ifp) { 421 rtcache_free(&sc->sc_ro); 422 m_freem(m); 423 ifp->if_oerrors++; 424 return ENETUNREACH; 425 } 426 427 ifp->if_opackets++; 428 ifp->if_obytes += m->m_pkthdr.len - sizeof(struct ip); 429 return ip_output(m, NULL, &sc->sc_ro, 0, NULL, NULL); 430 } 431 432 static int 433 isrfc1918addr(const struct in_addr *in) 434 { 435 /* 436 * returns 1 if private address range: 437 * 10.0.0.0/8 172.16.0.0/12 192.168.0.0/16 438 */ 439 if ((ntohl(in->s_addr) & 0xff000000) >> 24 == 10 || 440 (ntohl(in->s_addr) & 0xfff00000) >> 16 == 172 * 256 + 16 || 441 (ntohl(in->s_addr) & 0xffff0000) >> 16 == 192 * 256 + 168) 442 return 1; 443 444 return 0; 445 } 446 447 static int 448 stf_checkaddr4(struct stf_softc *sc, const struct in_addr *in, 449 struct ifnet *inifp /*incoming interface*/) 450 { 451 struct in_ifaddr *ia4; 452 453 /* 454 * reject packets with the following address: 455 * 224.0.0.0/4 0.0.0.0/8 127.0.0.0/8 255.0.0.0/8 456 */ 457 if (IN_MULTICAST(in->s_addr)) 458 return -1; 459 switch ((ntohl(in->s_addr) & 0xff000000) >> 24) { 460 case 0: case 127: case 255: 461 return -1; 462 } 463 464 /* 465 * reject packets with private address range. 466 * (requirement from RFC3056 section 2 1st paragraph) 467 */ 468 if (isrfc1918addr(in)) 469 return -1; 470 471 /* 472 * reject packet with IPv4 link-local (169.254.0.0/16), 473 * as suggested in draft-savola-v6ops-6to4-security-00.txt 474 */ 475 if (((ntohl(in->s_addr) & 0xff000000) >> 24) == 169 && 476 ((ntohl(in->s_addr) & 0x00ff0000) >> 16) == 254) 477 return -1; 478 479 /* 480 * reject packets with broadcast 481 */ 482 TAILQ_FOREACH(ia4, &in_ifaddrhead, ia_list) 483 { 484 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0) 485 continue; 486 if (in->s_addr == ia4->ia_broadaddr.sin_addr.s_addr) 487 return -1; 488 } 489 490 /* 491 * perform ingress filter 492 */ 493 if (sc && (sc->sc_if.if_flags & IFF_LINK2) == 0 && inifp) { 494 struct sockaddr_in sin; 495 struct rtentry *rt; 496 497 memset(&sin, 0, sizeof(sin)); 498 sin.sin_family = AF_INET; 499 sin.sin_len = sizeof(struct sockaddr_in); 500 sin.sin_addr = *in; 501 rt = rtalloc1((struct sockaddr *)&sin, 0); 502 if (!rt || rt->rt_ifp != inifp) { 503 #if 0 504 log(LOG_WARNING, "%s: packet from 0x%x dropped " 505 "due to ingress filter\n", if_name(&sc->sc_if), 506 (uint32_t)ntohl(sin.sin_addr.s_addr)); 507 #endif 508 if (rt) 509 rtfree(rt); 510 return -1; 511 } 512 rtfree(rt); 513 } 514 515 return 0; 516 } 517 518 static int 519 stf_checkaddr6(struct stf_softc *sc, const struct in6_addr *in6, 520 struct ifnet *inifp /*incoming interface*/) 521 { 522 523 /* 524 * check 6to4 addresses 525 */ 526 if (IN6_IS_ADDR_6TO4(in6)) 527 return stf_checkaddr4(sc, GET_V4(in6), inifp); 528 529 /* 530 * reject anything that look suspicious. the test is implemented 531 * in ip6_input too, but we check here as well to 532 * (1) reject bad packets earlier, and 533 * (2) to be safe against future ip6_input change. 534 */ 535 if (IN6_IS_ADDR_V4COMPAT(in6) || IN6_IS_ADDR_V4MAPPED(in6)) 536 return -1; 537 538 /* 539 * reject link-local and site-local unicast 540 * as suggested in draft-savola-v6ops-6to4-security-00.txt 541 */ 542 if (IN6_IS_ADDR_LINKLOCAL(in6) || IN6_IS_ADDR_SITELOCAL(in6)) 543 return -1; 544 545 /* 546 * reject node-local and link-local multicast 547 * as suggested in draft-savola-v6ops-6to4-security-00.txt 548 */ 549 if (IN6_IS_ADDR_MC_NODELOCAL(in6) || IN6_IS_ADDR_MC_LINKLOCAL(in6)) 550 return -1; 551 552 return 0; 553 } 554 555 void 556 in_stf_input(struct mbuf *m, ...) 557 { 558 int off, proto; 559 struct stf_softc *sc; 560 struct ip *ip; 561 struct ip6_hdr *ip6; 562 uint8_t otos, itos; 563 int s, isr; 564 struct ifqueue *ifq = NULL; 565 struct ifnet *ifp; 566 va_list ap; 567 568 va_start(ap, m); 569 off = va_arg(ap, int); 570 proto = va_arg(ap, int); 571 va_end(ap); 572 573 if (proto != IPPROTO_IPV6) { 574 m_freem(m); 575 return; 576 } 577 578 ip = mtod(m, struct ip *); 579 580 sc = (struct stf_softc *)encap_getarg(m); 581 582 if (sc == NULL || (sc->sc_if.if_flags & IFF_UP) == 0) { 583 m_freem(m); 584 return; 585 } 586 587 ifp = &sc->sc_if; 588 589 /* 590 * perform sanity check against outer src/dst. 591 * for source, perform ingress filter as well. 592 */ 593 if (stf_checkaddr4(sc, &ip->ip_dst, NULL) < 0 || 594 stf_checkaddr4(sc, &ip->ip_src, m->m_pkthdr.rcvif) < 0) { 595 m_freem(m); 596 return; 597 } 598 599 otos = ip->ip_tos; 600 m_adj(m, off); 601 602 if (m->m_len < sizeof(*ip6)) { 603 m = m_pullup(m, sizeof(*ip6)); 604 if (!m) 605 return; 606 } 607 ip6 = mtod(m, struct ip6_hdr *); 608 609 /* 610 * perform sanity check against inner src/dst. 611 * for source, perform ingress filter as well. 612 */ 613 if (stf_checkaddr6(sc, &ip6->ip6_dst, NULL) < 0 || 614 stf_checkaddr6(sc, &ip6->ip6_src, m->m_pkthdr.rcvif) < 0) { 615 m_freem(m); 616 return; 617 } 618 619 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 620 if ((ifp->if_flags & IFF_LINK1) != 0) 621 ip_ecn_egress(ECN_ALLOWED, &otos, &itos); 622 else 623 ip_ecn_egress(ECN_NOCARE, &otos, &itos); 624 ip6->ip6_flow &= ~htonl(0xff << 20); 625 ip6->ip6_flow |= htonl((uint32_t)itos << 20); 626 627 m->m_pkthdr.rcvif = ifp; 628 629 bpf_mtap_af(ifp, AF_INET6, m); 630 631 /* 632 * Put the packet to the network layer input queue according to the 633 * specified address family. 634 * See net/if_gif.c for possible issues with packet processing 635 * reorder due to extra queueing. 636 */ 637 ifq = &ip6intrq; 638 isr = NETISR_IPV6; 639 640 s = splnet(); 641 if (IF_QFULL(ifq)) { 642 IF_DROP(ifq); /* update statistics */ 643 m_freem(m); 644 splx(s); 645 return; 646 } 647 IF_ENQUEUE(ifq, m); 648 schednetisr(isr); 649 ifp->if_ipackets++; 650 ifp->if_ibytes += m->m_pkthdr.len; 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