1 /* $NetBSD: if_stf.c,v 1.103 2017/11/15 10:42:41 knakahara 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 1.103 2017/11/15 10:42:41 knakahara Exp $"); 79 80 #ifdef _KERNEL_OPT 81 #include "opt_inet.h" 82 #include "stf.h" 83 #endif 84 85 #ifndef INET6 86 #error "pseudo-device stf requires options INET6" 87 #endif 88 89 #include <sys/param.h> 90 #include <sys/systm.h> 91 #include <sys/socket.h> 92 #include <sys/sockio.h> 93 #include <sys/mbuf.h> 94 #include <sys/errno.h> 95 #include <sys/ioctl.h> 96 #include <sys/proc.h> 97 #include <sys/queue.h> 98 #include <sys/syslog.h> 99 #include <sys/device.h> 100 #include <sys/module.h> 101 102 #include <sys/cpu.h> 103 104 #include <net/if.h> 105 #include <net/route.h> 106 #include <net/netisr.h> 107 #include <net/if_types.h> 108 #include <net/if_stf.h> 109 110 #include <netinet/in.h> 111 #include <netinet/in_systm.h> 112 #include <netinet/ip.h> 113 #include <netinet/ip_var.h> 114 #include <netinet/in_var.h> 115 116 #include <netinet/ip6.h> 117 #include <netinet6/ip6_var.h> 118 #include <netinet6/in6_var.h> 119 #include <netinet/ip_ecn.h> 120 121 #include <netinet/ip_encap.h> 122 123 #include <net/net_osdep.h> 124 125 #include <net/bpf.h> 126 127 #include "ioconf.h" 128 129 #define IN6_IS_ADDR_6TO4(x) (ntohs((x)->s6_addr16[0]) == 0x2002) 130 #define GET_V4(x) ((const struct in_addr *)(&(x)->s6_addr16[1])) 131 132 struct stf_softc { 133 struct ifnet sc_if; /* common area */ 134 struct route sc_ro; 135 const struct encaptab *encap_cookie; 136 LIST_ENTRY(stf_softc) sc_list; 137 }; 138 139 static LIST_HEAD(, stf_softc) stf_softc_list; 140 141 static int stf_clone_create(struct if_clone *, int); 142 static int stf_clone_destroy(struct ifnet *); 143 144 struct if_clone stf_cloner = 145 IF_CLONE_INITIALIZER("stf", stf_clone_create, stf_clone_destroy); 146 147 static int ip_stf_ttl = STF_TTL; 148 149 extern struct domain inetdomain; 150 151 static const struct encapsw in_stf_encapsw = 152 { 153 .encapsw4 = { 154 .pr_input = in_stf_input, 155 .pr_ctlinput = NULL, 156 } 157 }; 158 159 static int stf_encapcheck(struct mbuf *, int, int, void *); 160 static struct in6_ifaddr *stf_getsrcifa6(struct ifnet *); 161 static int stf_output(struct ifnet *, struct mbuf *, const struct sockaddr *, 162 const struct rtentry *); 163 static int isrfc1918addr(const struct in_addr *); 164 static int stf_checkaddr4(struct stf_softc *, const struct in_addr *, 165 struct ifnet *); 166 static int stf_checkaddr6(struct stf_softc *, const struct in6_addr *, 167 struct ifnet *); 168 static void stf_rtrequest(int, struct rtentry *, const struct rt_addrinfo *); 169 static int stf_ioctl(struct ifnet *, u_long, void *); 170 171 /* ARGSUSED */ 172 void 173 stfattach(int count) 174 { 175 176 /* 177 * Nothing to do here, initialization is handled by the 178 * module initialization code in stfinit() below). 179 */ 180 } 181 182 static void 183 stfinit(void) 184 { 185 186 LIST_INIT(&stf_softc_list); 187 if_clone_attach(&stf_cloner); 188 } 189 190 static int 191 stfdetach(void) 192 { 193 int error = 0; 194 195 if (!LIST_EMPTY(&stf_softc_list)) 196 error = EBUSY; 197 198 if (error == 0) 199 if_clone_detach(&stf_cloner); 200 201 return error; 202 } 203 204 static int 205 stf_clone_create(struct if_clone *ifc, int unit) 206 { 207 struct stf_softc *sc; 208 int error; 209 210 sc = malloc(sizeof(struct stf_softc), M_DEVBUF, M_WAIT|M_ZERO); 211 if_initname(&sc->sc_if, ifc->ifc_name, unit); 212 213 error = encap_lock_enter(); 214 if (error) { 215 free(sc, M_DEVBUF); 216 return error; 217 } 218 219 if (LIST_FIRST(&stf_softc_list) != NULL) { 220 /* Only one stf interface is allowed. */ 221 encap_lock_exit(); 222 free(sc, M_DEVBUF); 223 return EEXIST; 224 } 225 226 sc->encap_cookie = encap_attach_func(AF_INET, IPPROTO_IPV6, 227 stf_encapcheck, &in_stf_encapsw, sc); 228 encap_lock_exit(); 229 if (sc->encap_cookie == NULL) { 230 printf("%s: unable to attach encap\n", if_name(&sc->sc_if)); 231 free(sc, M_DEVBUF); 232 return EIO; /* XXX */ 233 } 234 235 sc->sc_if.if_mtu = STF_MTU; 236 sc->sc_if.if_flags = 0; 237 sc->sc_if.if_ioctl = stf_ioctl; 238 sc->sc_if.if_output = stf_output; 239 sc->sc_if.if_type = IFT_STF; 240 sc->sc_if.if_dlt = DLT_NULL; 241 error = if_attach(&sc->sc_if); 242 if (error != 0) { 243 aprint_error("%s: if_initialize failed(%d)\n", 244 if_name(&sc->sc_if), error); 245 encap_lock_enter(); 246 encap_detach(sc->encap_cookie); 247 encap_lock_exit(); 248 free(sc, M_DEVBUF); 249 return error; 250 } 251 if_alloc_sadl(&sc->sc_if); 252 bpf_attach(&sc->sc_if, DLT_NULL, sizeof(u_int)); 253 LIST_INSERT_HEAD(&stf_softc_list, sc, sc_list); 254 return 0; 255 } 256 257 static int 258 stf_clone_destroy(struct ifnet *ifp) 259 { 260 struct stf_softc *sc = (void *) ifp; 261 262 encap_lock_enter(); 263 LIST_REMOVE(sc, sc_list); 264 encap_detach(sc->encap_cookie); 265 encap_lock_exit(); 266 bpf_detach(ifp); 267 if_detach(ifp); 268 rtcache_free(&sc->sc_ro); 269 free(sc, M_DEVBUF); 270 271 return 0; 272 } 273 274 static int 275 stf_encapcheck(struct mbuf *m, int off, int proto, void *arg) 276 { 277 struct ip ip; 278 struct in6_ifaddr *ia6; 279 struct stf_softc *sc; 280 struct in_addr a, b; 281 282 sc = (struct stf_softc *)arg; 283 if (sc == NULL) 284 return 0; 285 286 if ((sc->sc_if.if_flags & IFF_UP) == 0) 287 return 0; 288 289 /* IFF_LINK0 means "no decapsulation" */ 290 if ((sc->sc_if.if_flags & IFF_LINK0) != 0) 291 return 0; 292 293 if (proto != IPPROTO_IPV6) 294 return 0; 295 296 m_copydata(m, 0, sizeof(ip), (void *)&ip); 297 298 if (ip.ip_v != 4) 299 return 0; 300 301 ia6 = stf_getsrcifa6(&sc->sc_if); 302 if (ia6 == NULL) 303 return 0; 304 305 /* 306 * check if IPv4 dst matches the IPv4 address derived from the 307 * local 6to4 address. 308 * success on: dst = 10.1.1.1, ia6->ia_addr = 2002:0a01:0101:... 309 */ 310 if (memcmp(GET_V4(&ia6->ia_addr.sin6_addr), &ip.ip_dst, 311 sizeof(ip.ip_dst)) != 0) 312 return 0; 313 314 /* 315 * check if IPv4 src matches the IPv4 address derived from the 316 * local 6to4 address masked by prefixmask. 317 * success on: src = 10.1.1.1, ia6->ia_addr = 2002:0a00:.../24 318 * fail on: src = 10.1.1.1, ia6->ia_addr = 2002:0b00:.../24 319 */ 320 memset(&a, 0, sizeof(a)); 321 a.s_addr = GET_V4(&ia6->ia_addr.sin6_addr)->s_addr; 322 a.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 323 b = ip.ip_src; 324 b.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 325 if (a.s_addr != b.s_addr) 326 return 0; 327 328 /* stf interface makes single side match only */ 329 return 32; 330 } 331 332 static struct in6_ifaddr * 333 stf_getsrcifa6(struct ifnet *ifp) 334 { 335 struct ifaddr *ifa; 336 struct in_ifaddr *ia4; 337 struct sockaddr_in6 *sin6; 338 struct in_addr in; 339 int s; 340 341 s = pserialize_read_enter(); 342 IFADDR_READER_FOREACH(ifa, ifp) { 343 if (ifa->ifa_addr->sa_family != AF_INET6) 344 continue; 345 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 346 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) 347 continue; 348 349 memcpy(&in, GET_V4(&sin6->sin6_addr), sizeof(in)); 350 ia4 = in_get_ia(in); 351 if (ia4 == NULL) 352 continue; 353 354 pserialize_read_exit(s); 355 /* TODO NOMPSAFE */ 356 return (struct in6_ifaddr *)ifa; 357 } 358 pserialize_read_exit(s); 359 360 return NULL; 361 } 362 363 static int 364 stf_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 365 const struct rtentry *rt0) 366 { 367 struct rtentry *rt; 368 struct stf_softc *sc; 369 const struct sockaddr_in6 *dst6; 370 const struct in_addr *in4; 371 uint8_t tos; 372 struct ip *ip; 373 struct ip6_hdr *ip6; 374 struct in6_ifaddr *ia6; 375 union { 376 struct sockaddr dst; 377 struct sockaddr_in dst4; 378 } u; 379 380 sc = (struct stf_softc*)ifp; 381 dst6 = (const struct sockaddr_in6 *)dst; 382 383 /* just in case */ 384 if ((ifp->if_flags & IFF_UP) == 0) { 385 m_freem(m); 386 return ENETDOWN; 387 } 388 389 /* 390 * If we don't have an ip4 address that match my inner ip6 address, 391 * we shouldn't generate output. Without this check, we'll end up 392 * using wrong IPv4 source. 393 */ 394 ia6 = stf_getsrcifa6(ifp); 395 if (ia6 == NULL) { 396 m_freem(m); 397 ifp->if_oerrors++; 398 return ENETDOWN; 399 } 400 401 if (m->m_len < sizeof(*ip6)) { 402 m = m_pullup(m, sizeof(*ip6)); 403 if (m == NULL) { 404 ifp->if_oerrors++; 405 return ENOBUFS; 406 } 407 } 408 ip6 = mtod(m, struct ip6_hdr *); 409 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 410 411 /* 412 * Pickup the right outer dst addr from the list of candidates. 413 * ip6_dst has priority as it may be able to give us shorter IPv4 hops. 414 */ 415 if (IN6_IS_ADDR_6TO4(&ip6->ip6_dst)) 416 in4 = GET_V4(&ip6->ip6_dst); 417 else if (IN6_IS_ADDR_6TO4(&dst6->sin6_addr)) 418 in4 = GET_V4(&dst6->sin6_addr); 419 else { 420 m_freem(m); 421 ifp->if_oerrors++; 422 return ENETUNREACH; 423 } 424 425 bpf_mtap_af(ifp, AF_INET6, m); 426 427 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 428 if (m && m->m_len < sizeof(struct ip)) 429 m = m_pullup(m, sizeof(struct ip)); 430 if (m == NULL) { 431 ifp->if_oerrors++; 432 return ENOBUFS; 433 } 434 ip = mtod(m, struct ip *); 435 436 memset(ip, 0, sizeof(*ip)); 437 438 bcopy(GET_V4(&((struct sockaddr_in6 *)&ia6->ia_addr)->sin6_addr), 439 &ip->ip_src, sizeof(ip->ip_src)); 440 memcpy(&ip->ip_dst, in4, sizeof(ip->ip_dst)); 441 ip->ip_p = IPPROTO_IPV6; 442 ip->ip_ttl = ip_stf_ttl; 443 ip->ip_len = htons(m->m_pkthdr.len); 444 if (ifp->if_flags & IFF_LINK1) 445 ip_ecn_ingress(ECN_ALLOWED, &ip->ip_tos, &tos); 446 else 447 ip_ecn_ingress(ECN_NOCARE, &ip->ip_tos, &tos); 448 449 sockaddr_in_init(&u.dst4, &ip->ip_dst, 0); 450 if ((rt = rtcache_lookup(&sc->sc_ro, &u.dst)) == NULL) { 451 m_freem(m); 452 ifp->if_oerrors++; 453 return ENETUNREACH; 454 } 455 456 /* If the route constitutes infinite encapsulation, punt. */ 457 if (rt->rt_ifp == ifp) { 458 rtcache_unref(rt, &sc->sc_ro); 459 rtcache_free(&sc->sc_ro); 460 m_freem(m); 461 ifp->if_oerrors++; 462 return ENETUNREACH; 463 } 464 rtcache_unref(rt, &sc->sc_ro); 465 466 ifp->if_opackets++; 467 ifp->if_obytes += m->m_pkthdr.len - sizeof(struct ip); 468 return ip_output(m, NULL, &sc->sc_ro, 0, NULL, NULL); 469 } 470 471 static int 472 isrfc1918addr(const struct in_addr *in) 473 { 474 /* 475 * returns 1 if private address range: 476 * 10.0.0.0/8 172.16.0.0/12 192.168.0.0/16 477 */ 478 if ((ntohl(in->s_addr) & 0xff000000) >> 24 == 10 || 479 (ntohl(in->s_addr) & 0xfff00000) >> 16 == 172 * 256 + 16 || 480 (ntohl(in->s_addr) & 0xffff0000) >> 16 == 192 * 256 + 168) 481 return 1; 482 483 return 0; 484 } 485 486 static int 487 stf_checkaddr4(struct stf_softc *sc, const struct in_addr *in, 488 struct ifnet *inifp /*incoming interface*/) 489 { 490 struct in_ifaddr *ia4; 491 492 /* 493 * reject packets with the following address: 494 * 224.0.0.0/4 0.0.0.0/8 127.0.0.0/8 255.0.0.0/8 495 */ 496 if (IN_MULTICAST(in->s_addr)) 497 return -1; 498 switch ((ntohl(in->s_addr) & 0xff000000) >> 24) { 499 case 0: case 127: case 255: 500 return -1; 501 } 502 503 /* 504 * reject packets with private address range. 505 * (requirement from RFC3056 section 2 1st paragraph) 506 */ 507 if (isrfc1918addr(in)) 508 return -1; 509 510 /* 511 * reject packet with IPv4 link-local (169.254.0.0/16), 512 * as suggested in draft-savola-v6ops-6to4-security-00.txt 513 */ 514 if (((ntohl(in->s_addr) & 0xff000000) >> 24) == 169 && 515 ((ntohl(in->s_addr) & 0x00ff0000) >> 16) == 254) 516 return -1; 517 518 /* 519 * reject packets with broadcast 520 */ 521 IN_ADDRLIST_READER_FOREACH(ia4) { 522 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0) 523 continue; 524 if (in->s_addr == ia4->ia_broadaddr.sin_addr.s_addr) 525 return -1; 526 } 527 528 /* 529 * perform ingress filter 530 */ 531 if (sc && (sc->sc_if.if_flags & IFF_LINK2) == 0 && inifp) { 532 struct sockaddr_in sin; 533 struct rtentry *rt; 534 535 memset(&sin, 0, sizeof(sin)); 536 sin.sin_family = AF_INET; 537 sin.sin_len = sizeof(struct sockaddr_in); 538 sin.sin_addr = *in; 539 rt = rtalloc1((struct sockaddr *)&sin, 0); 540 if (!rt || rt->rt_ifp != inifp) { 541 #if 0 542 log(LOG_WARNING, "%s: packet from 0x%x dropped " 543 "due to ingress filter\n", if_name(&sc->sc_if), 544 (uint32_t)ntohl(sin.sin_addr.s_addr)); 545 #endif 546 if (rt) 547 rt_unref(rt); 548 return -1; 549 } 550 rt_unref(rt); 551 } 552 553 return 0; 554 } 555 556 static int 557 stf_checkaddr6(struct stf_softc *sc, const struct in6_addr *in6, 558 struct ifnet *inifp /*incoming interface*/) 559 { 560 561 /* 562 * check 6to4 addresses 563 */ 564 if (IN6_IS_ADDR_6TO4(in6)) 565 return stf_checkaddr4(sc, GET_V4(in6), inifp); 566 567 /* 568 * reject anything that look suspicious. the test is implemented 569 * in ip6_input too, but we check here as well to 570 * (1) reject bad packets earlier, and 571 * (2) to be safe against future ip6_input change. 572 */ 573 if (IN6_IS_ADDR_V4COMPAT(in6) || IN6_IS_ADDR_V4MAPPED(in6)) 574 return -1; 575 576 /* 577 * reject link-local and site-local unicast 578 * as suggested in draft-savola-v6ops-6to4-security-00.txt 579 */ 580 if (IN6_IS_ADDR_LINKLOCAL(in6) || IN6_IS_ADDR_SITELOCAL(in6)) 581 return -1; 582 583 /* 584 * reject node-local and link-local multicast 585 * as suggested in draft-savola-v6ops-6to4-security-00.txt 586 */ 587 if (IN6_IS_ADDR_MC_NODELOCAL(in6) || IN6_IS_ADDR_MC_LINKLOCAL(in6)) 588 return -1; 589 590 return 0; 591 } 592 593 void 594 in_stf_input(struct mbuf *m, int off, int proto, void *eparg) 595 { 596 int s; 597 struct stf_softc *sc = eparg; 598 struct ip *ip; 599 struct ip6_hdr *ip6; 600 uint8_t otos, itos; 601 struct ifnet *ifp; 602 size_t pktlen; 603 604 KASSERT(sc != NULL); 605 606 if (proto != IPPROTO_IPV6) { 607 m_freem(m); 608 return; 609 } 610 611 ip = mtod(m, struct ip *); 612 613 if ((sc->sc_if.if_flags & IFF_UP) == 0) { 614 m_freem(m); 615 return; 616 } 617 618 ifp = &sc->sc_if; 619 620 /* 621 * perform sanity check against outer src/dst. 622 * for source, perform ingress filter as well. 623 */ 624 if (stf_checkaddr4(sc, &ip->ip_dst, NULL) < 0 || 625 stf_checkaddr4(sc, &ip->ip_src, m_get_rcvif_NOMPSAFE(m)) < 0) { 626 m_freem(m); 627 return; 628 } 629 630 otos = ip->ip_tos; 631 m_adj(m, off); 632 633 if (m->m_len < sizeof(*ip6)) { 634 m = m_pullup(m, sizeof(*ip6)); 635 if (!m) 636 return; 637 } 638 ip6 = mtod(m, struct ip6_hdr *); 639 640 /* 641 * perform sanity check against inner src/dst. 642 * for source, perform ingress filter as well. 643 */ 644 if (stf_checkaddr6(sc, &ip6->ip6_dst, NULL) < 0 || 645 stf_checkaddr6(sc, &ip6->ip6_src, m_get_rcvif_NOMPSAFE(m)) < 0) { 646 m_freem(m); 647 return; 648 } 649 650 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 651 if ((ifp->if_flags & IFF_LINK1) != 0) 652 ip_ecn_egress(ECN_ALLOWED, &otos, &itos); 653 else 654 ip_ecn_egress(ECN_NOCARE, &otos, &itos); 655 ip6->ip6_flow &= ~htonl(0xff << 20); 656 ip6->ip6_flow |= htonl((uint32_t)itos << 20); 657 658 pktlen = m->m_pkthdr.len; 659 m_set_rcvif(m, ifp); 660 661 bpf_mtap_af(ifp, AF_INET6, m); 662 663 /* 664 * Put the packet to the network layer input queue according to the 665 * specified address family. 666 * See net/if_gif.c for possible issues with packet processing 667 * reorder due to extra queueing. 668 */ 669 670 s = splnet(); 671 if (__predict_true(pktq_enqueue(ip6_pktq, m, 0))) { 672 ifp->if_ipackets++; 673 ifp->if_ibytes += pktlen; 674 } else { 675 m_freem(m); 676 } 677 splx(s); 678 679 return; 680 } 681 682 /* ARGSUSED */ 683 static void 684 stf_rtrequest(int cmd, struct rtentry *rt, 685 const struct rt_addrinfo *info) 686 { 687 if (rt != NULL) { 688 struct stf_softc *sc; 689 690 sc = LIST_FIRST(&stf_softc_list); 691 rt->rt_rmx.rmx_mtu = (sc != NULL) ? sc->sc_if.if_mtu : STF_MTU; 692 } 693 } 694 695 static int 696 stf_ioctl(struct ifnet *ifp, u_long cmd, void *data) 697 { 698 struct ifaddr *ifa; 699 struct ifreq *ifr = data; 700 struct sockaddr_in6 *sin6; 701 int error; 702 703 error = 0; 704 switch (cmd) { 705 case SIOCINITIFADDR: 706 ifa = (struct ifaddr *)data; 707 if (ifa == NULL || ifa->ifa_addr->sa_family != AF_INET6) { 708 error = EAFNOSUPPORT; 709 break; 710 } 711 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 712 if (IN6_IS_ADDR_6TO4(&sin6->sin6_addr) && 713 !isrfc1918addr(GET_V4(&sin6->sin6_addr))) { 714 ifa->ifa_rtrequest = stf_rtrequest; 715 ifp->if_flags |= IFF_UP; 716 } else 717 error = EINVAL; 718 break; 719 720 case SIOCADDMULTI: 721 case SIOCDELMULTI: 722 if (ifr != NULL && 723 ifreq_getaddr(cmd, ifr)->sa_family == AF_INET6) 724 ; 725 else 726 error = EAFNOSUPPORT; 727 break; 728 729 case SIOCSIFMTU: 730 if (ifr->ifr_mtu < STF_MTU_MIN || ifr->ifr_mtu > STF_MTU_MAX) 731 return EINVAL; 732 else if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 733 error = 0; 734 break; 735 736 default: 737 error = ifioctl_common(ifp, cmd, data); 738 break; 739 } 740 741 return error; 742 } 743 744 /* 745 * Module infrastructure 746 */ 747 #include "if_module.h" 748 749 IF_MODULE(MODULE_CLASS_DRIVER, stf, "") 750