1 /* $NetBSD: if_stf.c,v 1.107 2020/01/29 04:28:27 thorpej 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 1.107 2020/01/29 04:28:27 thorpej 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/bpf.h> 124 125 #include "ioconf.h" 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 static int ip_stf_ttl = STF_TTL; 146 147 extern struct domain inetdomain; 148 149 static const struct encapsw in_stf_encapsw = 150 { 151 .encapsw4 = { 152 .pr_input = in_stf_input, 153 .pr_ctlinput = NULL, 154 } 155 }; 156 157 static int stf_encapcheck(struct mbuf *, int, int, void *); 158 static struct in6_ifaddr *stf_getsrcifa6(struct ifnet *); 159 static int stf_output(struct ifnet *, struct mbuf *, const struct sockaddr *, 160 const struct rtentry *); 161 static int isrfc1918addr(const struct in_addr *); 162 static int stf_checkaddr4(struct stf_softc *, const struct in_addr *, 163 struct ifnet *); 164 static int stf_checkaddr6(struct stf_softc *, const struct in6_addr *, 165 struct ifnet *); 166 static void stf_rtrequest(int, struct rtentry *, const struct rt_addrinfo *); 167 static int stf_ioctl(struct ifnet *, u_long, void *); 168 169 /* ARGSUSED */ 170 void 171 stfattach(int count) 172 { 173 174 /* 175 * Nothing to do here, initialization is handled by the 176 * module initialization code in stfinit() below). 177 */ 178 } 179 180 static void 181 stfinit(void) 182 { 183 184 LIST_INIT(&stf_softc_list); 185 if_clone_attach(&stf_cloner); 186 } 187 188 static int 189 stfdetach(void) 190 { 191 int error = 0; 192 193 if (!LIST_EMPTY(&stf_softc_list)) 194 error = EBUSY; 195 196 if (error == 0) 197 if_clone_detach(&stf_cloner); 198 199 return error; 200 } 201 202 static int 203 stf_clone_create(struct if_clone *ifc, int unit) 204 { 205 struct stf_softc *sc; 206 int error; 207 208 sc = malloc(sizeof(struct stf_softc), M_DEVBUF, M_WAIT|M_ZERO); 209 if_initname(&sc->sc_if, ifc->ifc_name, unit); 210 211 error = encap_lock_enter(); 212 if (error) { 213 free(sc, M_DEVBUF); 214 return error; 215 } 216 217 if (LIST_FIRST(&stf_softc_list) != NULL) { 218 /* Only one stf interface is allowed. */ 219 encap_lock_exit(); 220 free(sc, M_DEVBUF); 221 return EEXIST; 222 } 223 224 sc->encap_cookie = encap_attach_func(AF_INET, IPPROTO_IPV6, 225 stf_encapcheck, &in_stf_encapsw, sc); 226 encap_lock_exit(); 227 if (sc->encap_cookie == NULL) { 228 printf("%s: unable to attach encap\n", if_name(&sc->sc_if)); 229 free(sc, M_DEVBUF); 230 return EIO; /* XXX */ 231 } 232 233 sc->sc_if.if_mtu = STF_MTU; 234 sc->sc_if.if_flags = 0; 235 sc->sc_if.if_ioctl = stf_ioctl; 236 sc->sc_if.if_output = stf_output; 237 sc->sc_if.if_type = IFT_STF; 238 sc->sc_if.if_dlt = DLT_NULL; 239 error = if_attach(&sc->sc_if); 240 if (error != 0) { 241 aprint_error("%s: if_initialize failed(%d)\n", 242 if_name(&sc->sc_if), error); 243 encap_lock_enter(); 244 encap_detach(sc->encap_cookie); 245 encap_lock_exit(); 246 free(sc, M_DEVBUF); 247 return error; 248 } 249 if_alloc_sadl(&sc->sc_if); 250 bpf_attach(&sc->sc_if, DLT_NULL, sizeof(u_int)); 251 LIST_INSERT_HEAD(&stf_softc_list, sc, sc_list); 252 return 0; 253 } 254 255 static int 256 stf_clone_destroy(struct ifnet *ifp) 257 { 258 struct stf_softc *sc = (void *) ifp; 259 260 encap_lock_enter(); 261 LIST_REMOVE(sc, sc_list); 262 encap_detach(sc->encap_cookie); 263 encap_lock_exit(); 264 bpf_detach(ifp); 265 if_detach(ifp); 266 rtcache_free(&sc->sc_ro); 267 free(sc, M_DEVBUF); 268 269 return 0; 270 } 271 272 static int 273 stf_encapcheck(struct mbuf *m, int off, int proto, void *arg) 274 { 275 struct ip ip; 276 struct in6_ifaddr *ia6; 277 struct stf_softc *sc; 278 struct in_addr a, b; 279 280 sc = (struct stf_softc *)arg; 281 if (sc == NULL) 282 return 0; 283 284 if ((sc->sc_if.if_flags & IFF_UP) == 0) 285 return 0; 286 287 /* IFF_LINK0 means "no decapsulation" */ 288 if ((sc->sc_if.if_flags & IFF_LINK0) != 0) 289 return 0; 290 291 if (proto != IPPROTO_IPV6) 292 return 0; 293 294 m_copydata(m, 0, sizeof(ip), (void *)&ip); 295 296 if (ip.ip_v != 4) 297 return 0; 298 299 ia6 = stf_getsrcifa6(&sc->sc_if); 300 if (ia6 == NULL) 301 return 0; 302 303 /* 304 * check if IPv4 dst matches the IPv4 address derived from the 305 * local 6to4 address. 306 * success on: dst = 10.1.1.1, ia6->ia_addr = 2002:0a01:0101:... 307 */ 308 if (memcmp(GET_V4(&ia6->ia_addr.sin6_addr), &ip.ip_dst, 309 sizeof(ip.ip_dst)) != 0) 310 return 0; 311 312 /* 313 * check if IPv4 src matches the IPv4 address derived from the 314 * local 6to4 address masked by prefixmask. 315 * success on: src = 10.1.1.1, ia6->ia_addr = 2002:0a00:.../24 316 * fail on: src = 10.1.1.1, ia6->ia_addr = 2002:0b00:.../24 317 */ 318 memset(&a, 0, sizeof(a)); 319 a.s_addr = GET_V4(&ia6->ia_addr.sin6_addr)->s_addr; 320 a.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 321 b = ip.ip_src; 322 b.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 323 if (a.s_addr != b.s_addr) 324 return 0; 325 326 /* stf interface makes single side match only */ 327 return 32; 328 } 329 330 static struct in6_ifaddr * 331 stf_getsrcifa6(struct ifnet *ifp) 332 { 333 struct ifaddr *ifa; 334 struct in_ifaddr *ia4; 335 struct sockaddr_in6 *sin6; 336 struct in_addr in; 337 int s; 338 339 s = pserialize_read_enter(); 340 IFADDR_READER_FOREACH(ifa, ifp) { 341 if (ifa->ifa_addr->sa_family != AF_INET6) 342 continue; 343 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 344 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) 345 continue; 346 347 memcpy(&in, GET_V4(&sin6->sin6_addr), sizeof(in)); 348 ia4 = in_get_ia(in); 349 if (ia4 == NULL) 350 continue; 351 352 pserialize_read_exit(s); 353 /* TODO NOMPSAFE */ 354 return (struct in6_ifaddr *)ifa; 355 } 356 pserialize_read_exit(s); 357 358 return NULL; 359 } 360 361 static int 362 stf_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 363 const struct rtentry *rt0) 364 { 365 struct rtentry *rt; 366 struct stf_softc *sc; 367 const struct sockaddr_in6 *dst6; 368 const struct in_addr *in4; 369 uint8_t tos; 370 struct ip *ip; 371 struct ip6_hdr *ip6; 372 struct in6_ifaddr *ia6; 373 union { 374 struct sockaddr dst; 375 struct sockaddr_in dst4; 376 } u; 377 378 sc = (struct stf_softc*)ifp; 379 dst6 = (const struct sockaddr_in6 *)dst; 380 381 /* just in case */ 382 if ((ifp->if_flags & IFF_UP) == 0) { 383 m_freem(m); 384 return ENETDOWN; 385 } 386 387 /* 388 * If we don't have an ip4 address that match my inner ip6 address, 389 * we shouldn't generate output. Without this check, we'll end up 390 * using wrong IPv4 source. 391 */ 392 ia6 = stf_getsrcifa6(ifp); 393 if (ia6 == NULL) { 394 m_freem(m); 395 if_statinc(ifp, if_oerrors); 396 return ENETDOWN; 397 } 398 399 if (m->m_len < sizeof(*ip6)) { 400 m = m_pullup(m, sizeof(*ip6)); 401 if (m == NULL) { 402 if_statinc(ifp, if_oerrors); 403 return ENOBUFS; 404 } 405 } 406 ip6 = mtod(m, struct ip6_hdr *); 407 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 408 409 /* 410 * Pickup the right outer dst addr from the list of candidates. 411 * ip6_dst has priority as it may be able to give us shorter IPv4 hops. 412 */ 413 if (IN6_IS_ADDR_6TO4(&ip6->ip6_dst)) 414 in4 = GET_V4(&ip6->ip6_dst); 415 else if (IN6_IS_ADDR_6TO4(&dst6->sin6_addr)) 416 in4 = GET_V4(&dst6->sin6_addr); 417 else { 418 m_freem(m); 419 if_statinc(ifp, if_oerrors); 420 return ENETUNREACH; 421 } 422 423 bpf_mtap_af(ifp, AF_INET6, m, BPF_D_OUT); 424 425 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 426 if (m && m->m_len < sizeof(struct ip)) 427 m = m_pullup(m, sizeof(struct ip)); 428 if (m == NULL) { 429 if_statinc(ifp, if_oerrors); 430 return ENOBUFS; 431 } 432 ip = mtod(m, struct ip *); 433 434 memset(ip, 0, sizeof(*ip)); 435 436 bcopy(GET_V4(&((struct sockaddr_in6 *)&ia6->ia_addr)->sin6_addr), 437 &ip->ip_src, sizeof(ip->ip_src)); 438 memcpy(&ip->ip_dst, in4, sizeof(ip->ip_dst)); 439 ip->ip_p = IPPROTO_IPV6; 440 ip->ip_ttl = ip_stf_ttl; 441 ip->ip_len = htons(m->m_pkthdr.len); 442 if (ifp->if_flags & IFF_LINK1) 443 ip_ecn_ingress(ECN_ALLOWED, &ip->ip_tos, &tos); 444 else 445 ip_ecn_ingress(ECN_NOCARE, &ip->ip_tos, &tos); 446 447 sockaddr_in_init(&u.dst4, &ip->ip_dst, 0); 448 if ((rt = rtcache_lookup(&sc->sc_ro, &u.dst)) == NULL) { 449 m_freem(m); 450 if_statinc(ifp, if_oerrors); 451 return ENETUNREACH; 452 } 453 454 /* If the route constitutes infinite encapsulation, punt. */ 455 if (rt->rt_ifp == ifp) { 456 rtcache_unref(rt, &sc->sc_ro); 457 rtcache_free(&sc->sc_ro); 458 m_freem(m); 459 if_statinc(ifp, if_oerrors); 460 return ENETUNREACH; 461 } 462 rtcache_unref(rt, &sc->sc_ro); 463 464 if_statadd2(ifp, if_opackets, 1, 465 if_obytes, m->m_pkthdr.len - sizeof(struct ip)); 466 return ip_output(m, NULL, &sc->sc_ro, 0, NULL, NULL); 467 } 468 469 static int 470 isrfc1918addr(const struct in_addr *in) 471 { 472 /* 473 * returns 1 if private address range: 474 * 10.0.0.0/8 172.16.0.0/12 192.168.0.0/16 475 */ 476 if ((ntohl(in->s_addr) & 0xff000000) >> 24 == 10 || 477 (ntohl(in->s_addr) & 0xfff00000) >> 16 == 172 * 256 + 16 || 478 (ntohl(in->s_addr) & 0xffff0000) >> 16 == 192 * 256 + 168) 479 return 1; 480 481 return 0; 482 } 483 484 static int 485 stf_checkaddr4(struct stf_softc *sc, const struct in_addr *in, 486 struct ifnet *inifp /*incoming interface*/) 487 { 488 struct in_ifaddr *ia4; 489 490 /* 491 * reject packets with the following address: 492 * 224.0.0.0/4 0.0.0.0/8 127.0.0.0/8 255.0.0.0/8 493 */ 494 if (IN_MULTICAST(in->s_addr)) 495 return -1; 496 switch ((ntohl(in->s_addr) & 0xff000000) >> 24) { 497 case 0: case 127: case 255: 498 return -1; 499 } 500 501 /* 502 * reject packets with private address range. 503 * (requirement from RFC3056 section 2 1st paragraph) 504 */ 505 if (isrfc1918addr(in)) 506 return -1; 507 508 /* 509 * reject packet with IPv4 link-local (169.254.0.0/16), 510 * as suggested in draft-savola-v6ops-6to4-security-00.txt 511 */ 512 if (((ntohl(in->s_addr) & 0xff000000) >> 24) == 169 && 513 ((ntohl(in->s_addr) & 0x00ff0000) >> 16) == 254) 514 return -1; 515 516 /* 517 * reject packets with broadcast 518 */ 519 IN_ADDRLIST_READER_FOREACH(ia4) { 520 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0) 521 continue; 522 if (in->s_addr == ia4->ia_broadaddr.sin_addr.s_addr) 523 return -1; 524 } 525 526 /* 527 * perform ingress filter 528 */ 529 if (sc && (sc->sc_if.if_flags & IFF_LINK2) == 0 && inifp) { 530 struct sockaddr_in sin; 531 struct rtentry *rt; 532 533 memset(&sin, 0, sizeof(sin)); 534 sin.sin_family = AF_INET; 535 sin.sin_len = sizeof(struct sockaddr_in); 536 sin.sin_addr = *in; 537 rt = rtalloc1((struct sockaddr *)&sin, 0); 538 if (!rt || rt->rt_ifp != inifp) { 539 #if 0 540 log(LOG_WARNING, "%s: packet from 0x%x dropped " 541 "due to ingress filter\n", if_name(&sc->sc_if), 542 (uint32_t)ntohl(sin.sin_addr.s_addr)); 543 #endif 544 if (rt) 545 rt_unref(rt); 546 return -1; 547 } 548 rt_unref(rt); 549 } 550 551 return 0; 552 } 553 554 static int 555 stf_checkaddr6(struct stf_softc *sc, const struct in6_addr *in6, 556 struct ifnet *inifp /*incoming interface*/) 557 { 558 559 /* 560 * check 6to4 addresses 561 */ 562 if (IN6_IS_ADDR_6TO4(in6)) 563 return stf_checkaddr4(sc, GET_V4(in6), inifp); 564 565 /* 566 * reject anything that look suspicious. the test is implemented 567 * in ip6_input too, but we check here as well to 568 * (1) reject bad packets earlier, and 569 * (2) to be safe against future ip6_input change. 570 */ 571 if (IN6_IS_ADDR_V4COMPAT(in6) || IN6_IS_ADDR_V4MAPPED(in6)) 572 return -1; 573 574 /* 575 * reject link-local and site-local unicast 576 * as suggested in draft-savola-v6ops-6to4-security-00.txt 577 */ 578 if (IN6_IS_ADDR_LINKLOCAL(in6) || IN6_IS_ADDR_SITELOCAL(in6)) 579 return -1; 580 581 /* 582 * reject node-local and link-local multicast 583 * as suggested in draft-savola-v6ops-6to4-security-00.txt 584 */ 585 if (IN6_IS_ADDR_MC_NODELOCAL(in6) || IN6_IS_ADDR_MC_LINKLOCAL(in6)) 586 return -1; 587 588 return 0; 589 } 590 591 void 592 in_stf_input(struct mbuf *m, int off, int proto, void *eparg) 593 { 594 int s; 595 struct stf_softc *sc = eparg; 596 struct ip *ip; 597 struct ip6_hdr *ip6; 598 uint8_t otos, itos; 599 struct ifnet *ifp; 600 size_t pktlen; 601 602 KASSERT(sc != NULL); 603 604 if (proto != IPPROTO_IPV6) { 605 m_freem(m); 606 return; 607 } 608 609 ip = mtod(m, struct ip *); 610 611 if ((sc->sc_if.if_flags & IFF_UP) == 0) { 612 m_freem(m); 613 return; 614 } 615 616 ifp = &sc->sc_if; 617 618 /* 619 * perform sanity check against outer src/dst. 620 * for source, perform ingress filter as well. 621 */ 622 if (stf_checkaddr4(sc, &ip->ip_dst, NULL) < 0 || 623 stf_checkaddr4(sc, &ip->ip_src, m_get_rcvif_NOMPSAFE(m)) < 0) { 624 m_freem(m); 625 return; 626 } 627 628 otos = ip->ip_tos; 629 m_adj(m, off); 630 631 if (m->m_len < sizeof(*ip6)) { 632 m = m_pullup(m, sizeof(*ip6)); 633 if (!m) 634 return; 635 } 636 ip6 = mtod(m, struct ip6_hdr *); 637 638 /* 639 * perform sanity check against inner src/dst. 640 * for source, perform ingress filter as well. 641 */ 642 if (stf_checkaddr6(sc, &ip6->ip6_dst, NULL) < 0 || 643 stf_checkaddr6(sc, &ip6->ip6_src, m_get_rcvif_NOMPSAFE(m)) < 0) { 644 m_freem(m); 645 return; 646 } 647 648 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 649 if ((ifp->if_flags & IFF_LINK1) != 0) 650 ip_ecn_egress(ECN_ALLOWED, &otos, &itos); 651 else 652 ip_ecn_egress(ECN_NOCARE, &otos, &itos); 653 ip6->ip6_flow &= ~htonl(0xff << 20); 654 ip6->ip6_flow |= htonl((uint32_t)itos << 20); 655 656 pktlen = m->m_pkthdr.len; 657 m_set_rcvif(m, ifp); 658 659 bpf_mtap_af(ifp, AF_INET6, m, BPF_D_IN); 660 661 /* 662 * Put the packet to the network layer input queue according to the 663 * specified address family. 664 * See net/if_gif.c for possible issues with packet processing 665 * reorder due to extra queueing. 666 */ 667 668 s = splnet(); 669 if (__predict_true(pktq_enqueue(ip6_pktq, m, 0))) { 670 if_statadd2(ifp, if_ipackets, 1, if_ibytes, pktlen); 671 } else { 672 m_freem(m); 673 } 674 splx(s); 675 676 return; 677 } 678 679 /* ARGSUSED */ 680 static void 681 stf_rtrequest(int cmd, struct rtentry *rt, 682 const struct rt_addrinfo *info) 683 { 684 if (rt != NULL) { 685 struct stf_softc *sc; 686 687 sc = LIST_FIRST(&stf_softc_list); 688 rt->rt_rmx.rmx_mtu = (sc != NULL) ? sc->sc_if.if_mtu : STF_MTU; 689 } 690 } 691 692 static int 693 stf_ioctl(struct ifnet *ifp, u_long cmd, void *data) 694 { 695 struct ifaddr *ifa; 696 struct ifreq *ifr = data; 697 struct sockaddr_in6 *sin6; 698 int error; 699 700 error = 0; 701 switch (cmd) { 702 case SIOCINITIFADDR: 703 ifa = (struct ifaddr *)data; 704 if (ifa == NULL || ifa->ifa_addr->sa_family != AF_INET6) { 705 error = EAFNOSUPPORT; 706 break; 707 } 708 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 709 if (IN6_IS_ADDR_6TO4(&sin6->sin6_addr) && 710 !isrfc1918addr(GET_V4(&sin6->sin6_addr))) { 711 ifa->ifa_rtrequest = stf_rtrequest; 712 ifp->if_flags |= IFF_UP; 713 } else 714 error = EINVAL; 715 break; 716 717 case SIOCADDMULTI: 718 case SIOCDELMULTI: 719 if (ifr != NULL && 720 ifreq_getaddr(cmd, ifr)->sa_family == AF_INET6) 721 ; 722 else 723 error = EAFNOSUPPORT; 724 break; 725 726 case SIOCSIFMTU: 727 if (ifr->ifr_mtu < STF_MTU_MIN || ifr->ifr_mtu > STF_MTU_MAX) 728 return EINVAL; 729 else if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 730 error = 0; 731 break; 732 733 default: 734 error = ifioctl_common(ifp, cmd, data); 735 break; 736 } 737 738 return error; 739 } 740 741 /* 742 * Module infrastructure 743 */ 744 #include "if_module.h" 745 746 IF_MODULE(MODULE_CLASS_DRIVER, stf, NULL) 747