1 /* $NetBSD: if_stf.c,v 1.101 2016/12/12 03:55:57 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 1.101 2016/12/12 03:55:57 ozaki-r 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 if_attach(&sc->sc_if); 242 if_alloc_sadl(&sc->sc_if); 243 bpf_attach(&sc->sc_if, DLT_NULL, sizeof(u_int)); 244 LIST_INSERT_HEAD(&stf_softc_list, sc, sc_list); 245 return (0); 246 } 247 248 static int 249 stf_clone_destroy(struct ifnet *ifp) 250 { 251 struct stf_softc *sc = (void *) ifp; 252 253 encap_lock_enter(); 254 LIST_REMOVE(sc, sc_list); 255 encap_detach(sc->encap_cookie); 256 encap_lock_exit(); 257 bpf_detach(ifp); 258 if_detach(ifp); 259 rtcache_free(&sc->sc_ro); 260 free(sc, M_DEVBUF); 261 262 return (0); 263 } 264 265 static int 266 stf_encapcheck(struct mbuf *m, int off, int proto, void *arg) 267 { 268 struct ip ip; 269 struct in6_ifaddr *ia6; 270 struct stf_softc *sc; 271 struct in_addr a, b; 272 273 sc = (struct stf_softc *)arg; 274 if (sc == NULL) 275 return 0; 276 277 if ((sc->sc_if.if_flags & IFF_UP) == 0) 278 return 0; 279 280 /* IFF_LINK0 means "no decapsulation" */ 281 if ((sc->sc_if.if_flags & IFF_LINK0) != 0) 282 return 0; 283 284 if (proto != IPPROTO_IPV6) 285 return 0; 286 287 m_copydata(m, 0, sizeof(ip), (void *)&ip); 288 289 if (ip.ip_v != 4) 290 return 0; 291 292 ia6 = stf_getsrcifa6(&sc->sc_if); 293 if (ia6 == NULL) 294 return 0; 295 296 /* 297 * check if IPv4 dst matches the IPv4 address derived from the 298 * local 6to4 address. 299 * success on: dst = 10.1.1.1, ia6->ia_addr = 2002:0a01:0101:... 300 */ 301 if (memcmp(GET_V4(&ia6->ia_addr.sin6_addr), &ip.ip_dst, 302 sizeof(ip.ip_dst)) != 0) 303 return 0; 304 305 /* 306 * check if IPv4 src matches the IPv4 address derived from the 307 * local 6to4 address masked by prefixmask. 308 * success on: src = 10.1.1.1, ia6->ia_addr = 2002:0a00:.../24 309 * fail on: src = 10.1.1.1, ia6->ia_addr = 2002:0b00:.../24 310 */ 311 memset(&a, 0, sizeof(a)); 312 a.s_addr = GET_V4(&ia6->ia_addr.sin6_addr)->s_addr; 313 a.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 314 b = ip.ip_src; 315 b.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 316 if (a.s_addr != b.s_addr) 317 return 0; 318 319 /* stf interface makes single side match only */ 320 return 32; 321 } 322 323 static struct in6_ifaddr * 324 stf_getsrcifa6(struct ifnet *ifp) 325 { 326 struct ifaddr *ifa; 327 struct in_ifaddr *ia4; 328 struct sockaddr_in6 *sin6; 329 struct in_addr in; 330 int s; 331 332 s = pserialize_read_enter(); 333 IFADDR_READER_FOREACH(ifa, ifp) { 334 if (ifa->ifa_addr->sa_family != AF_INET6) 335 continue; 336 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 337 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) 338 continue; 339 340 memcpy(&in, GET_V4(&sin6->sin6_addr), sizeof(in)); 341 ia4 = in_get_ia(in); 342 if (ia4 == NULL) 343 continue; 344 345 pserialize_read_exit(s); 346 /* TODO NOMPSAFE */ 347 return (struct in6_ifaddr *)ifa; 348 } 349 pserialize_read_exit(s); 350 351 return NULL; 352 } 353 354 static int 355 stf_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 356 const struct rtentry *rt0) 357 { 358 struct rtentry *rt; 359 struct stf_softc *sc; 360 const struct sockaddr_in6 *dst6; 361 const struct in_addr *in4; 362 uint8_t tos; 363 struct ip *ip; 364 struct ip6_hdr *ip6; 365 struct in6_ifaddr *ia6; 366 union { 367 struct sockaddr dst; 368 struct sockaddr_in dst4; 369 } u; 370 371 sc = (struct stf_softc*)ifp; 372 dst6 = (const struct sockaddr_in6 *)dst; 373 374 /* just in case */ 375 if ((ifp->if_flags & IFF_UP) == 0) { 376 m_freem(m); 377 return ENETDOWN; 378 } 379 380 /* 381 * If we don't have an ip4 address that match my inner ip6 address, 382 * we shouldn't generate output. Without this check, we'll end up 383 * using wrong IPv4 source. 384 */ 385 ia6 = stf_getsrcifa6(ifp); 386 if (ia6 == NULL) { 387 m_freem(m); 388 ifp->if_oerrors++; 389 return ENETDOWN; 390 } 391 392 if (m->m_len < sizeof(*ip6)) { 393 m = m_pullup(m, sizeof(*ip6)); 394 if (m == NULL) { 395 ifp->if_oerrors++; 396 return ENOBUFS; 397 } 398 } 399 ip6 = mtod(m, struct ip6_hdr *); 400 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 401 402 /* 403 * Pickup the right outer dst addr from the list of candidates. 404 * ip6_dst has priority as it may be able to give us shorter IPv4 hops. 405 */ 406 if (IN6_IS_ADDR_6TO4(&ip6->ip6_dst)) 407 in4 = GET_V4(&ip6->ip6_dst); 408 else if (IN6_IS_ADDR_6TO4(&dst6->sin6_addr)) 409 in4 = GET_V4(&dst6->sin6_addr); 410 else { 411 m_freem(m); 412 ifp->if_oerrors++; 413 return ENETUNREACH; 414 } 415 416 bpf_mtap_af(ifp, AF_INET6, m); 417 418 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 419 if (m && m->m_len < sizeof(struct ip)) 420 m = m_pullup(m, sizeof(struct ip)); 421 if (m == NULL) { 422 ifp->if_oerrors++; 423 return ENOBUFS; 424 } 425 ip = mtod(m, struct ip *); 426 427 memset(ip, 0, sizeof(*ip)); 428 429 bcopy(GET_V4(&((struct sockaddr_in6 *)&ia6->ia_addr)->sin6_addr), 430 &ip->ip_src, sizeof(ip->ip_src)); 431 memcpy(&ip->ip_dst, in4, sizeof(ip->ip_dst)); 432 ip->ip_p = IPPROTO_IPV6; 433 ip->ip_ttl = ip_stf_ttl; 434 ip->ip_len = htons(m->m_pkthdr.len); 435 if (ifp->if_flags & IFF_LINK1) 436 ip_ecn_ingress(ECN_ALLOWED, &ip->ip_tos, &tos); 437 else 438 ip_ecn_ingress(ECN_NOCARE, &ip->ip_tos, &tos); 439 440 sockaddr_in_init(&u.dst4, &ip->ip_dst, 0); 441 if ((rt = rtcache_lookup(&sc->sc_ro, &u.dst)) == NULL) { 442 m_freem(m); 443 ifp->if_oerrors++; 444 return ENETUNREACH; 445 } 446 447 /* If the route constitutes infinite encapsulation, punt. */ 448 if (rt->rt_ifp == ifp) { 449 rtcache_unref(rt, &sc->sc_ro); 450 rtcache_free(&sc->sc_ro); 451 m_freem(m); 452 ifp->if_oerrors++; 453 return ENETUNREACH; 454 } 455 rtcache_unref(rt, &sc->sc_ro); 456 457 ifp->if_opackets++; 458 ifp->if_obytes += m->m_pkthdr.len - sizeof(struct ip); 459 return ip_output(m, NULL, &sc->sc_ro, 0, NULL, NULL); 460 } 461 462 static int 463 isrfc1918addr(const struct in_addr *in) 464 { 465 /* 466 * returns 1 if private address range: 467 * 10.0.0.0/8 172.16.0.0/12 192.168.0.0/16 468 */ 469 if ((ntohl(in->s_addr) & 0xff000000) >> 24 == 10 || 470 (ntohl(in->s_addr) & 0xfff00000) >> 16 == 172 * 256 + 16 || 471 (ntohl(in->s_addr) & 0xffff0000) >> 16 == 192 * 256 + 168) 472 return 1; 473 474 return 0; 475 } 476 477 static int 478 stf_checkaddr4(struct stf_softc *sc, const struct in_addr *in, 479 struct ifnet *inifp /*incoming interface*/) 480 { 481 struct in_ifaddr *ia4; 482 483 /* 484 * reject packets with the following address: 485 * 224.0.0.0/4 0.0.0.0/8 127.0.0.0/8 255.0.0.0/8 486 */ 487 if (IN_MULTICAST(in->s_addr)) 488 return -1; 489 switch ((ntohl(in->s_addr) & 0xff000000) >> 24) { 490 case 0: case 127: case 255: 491 return -1; 492 } 493 494 /* 495 * reject packets with private address range. 496 * (requirement from RFC3056 section 2 1st paragraph) 497 */ 498 if (isrfc1918addr(in)) 499 return -1; 500 501 /* 502 * reject packet with IPv4 link-local (169.254.0.0/16), 503 * as suggested in draft-savola-v6ops-6to4-security-00.txt 504 */ 505 if (((ntohl(in->s_addr) & 0xff000000) >> 24) == 169 && 506 ((ntohl(in->s_addr) & 0x00ff0000) >> 16) == 254) 507 return -1; 508 509 /* 510 * reject packets with broadcast 511 */ 512 IN_ADDRLIST_READER_FOREACH(ia4) { 513 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0) 514 continue; 515 if (in->s_addr == ia4->ia_broadaddr.sin_addr.s_addr) 516 return -1; 517 } 518 519 /* 520 * perform ingress filter 521 */ 522 if (sc && (sc->sc_if.if_flags & IFF_LINK2) == 0 && inifp) { 523 struct sockaddr_in sin; 524 struct rtentry *rt; 525 526 memset(&sin, 0, sizeof(sin)); 527 sin.sin_family = AF_INET; 528 sin.sin_len = sizeof(struct sockaddr_in); 529 sin.sin_addr = *in; 530 rt = rtalloc1((struct sockaddr *)&sin, 0); 531 if (!rt || rt->rt_ifp != inifp) { 532 #if 0 533 log(LOG_WARNING, "%s: packet from 0x%x dropped " 534 "due to ingress filter\n", if_name(&sc->sc_if), 535 (uint32_t)ntohl(sin.sin_addr.s_addr)); 536 #endif 537 if (rt) 538 rt_unref(rt); 539 return -1; 540 } 541 rt_unref(rt); 542 } 543 544 return 0; 545 } 546 547 static int 548 stf_checkaddr6(struct stf_softc *sc, const struct in6_addr *in6, 549 struct ifnet *inifp /*incoming interface*/) 550 { 551 552 /* 553 * check 6to4 addresses 554 */ 555 if (IN6_IS_ADDR_6TO4(in6)) 556 return stf_checkaddr4(sc, GET_V4(in6), inifp); 557 558 /* 559 * reject anything that look suspicious. the test is implemented 560 * in ip6_input too, but we check here as well to 561 * (1) reject bad packets earlier, and 562 * (2) to be safe against future ip6_input change. 563 */ 564 if (IN6_IS_ADDR_V4COMPAT(in6) || IN6_IS_ADDR_V4MAPPED(in6)) 565 return -1; 566 567 /* 568 * reject link-local and site-local unicast 569 * as suggested in draft-savola-v6ops-6to4-security-00.txt 570 */ 571 if (IN6_IS_ADDR_LINKLOCAL(in6) || IN6_IS_ADDR_SITELOCAL(in6)) 572 return -1; 573 574 /* 575 * reject node-local and link-local multicast 576 * as suggested in draft-savola-v6ops-6to4-security-00.txt 577 */ 578 if (IN6_IS_ADDR_MC_NODELOCAL(in6) || IN6_IS_ADDR_MC_LINKLOCAL(in6)) 579 return -1; 580 581 return 0; 582 } 583 584 void 585 in_stf_input(struct mbuf *m, int off, int proto) 586 { 587 int s; 588 struct stf_softc *sc; 589 struct ip *ip; 590 struct ip6_hdr *ip6; 591 uint8_t otos, itos; 592 struct ifnet *ifp; 593 size_t pktlen; 594 595 if (proto != IPPROTO_IPV6) { 596 m_freem(m); 597 return; 598 } 599 600 ip = mtod(m, struct ip *); 601 602 sc = (struct stf_softc *)encap_getarg(m); 603 604 if (sc == NULL || (sc->sc_if.if_flags & IFF_UP) == 0) { 605 m_freem(m); 606 return; 607 } 608 609 ifp = &sc->sc_if; 610 611 /* 612 * perform sanity check against outer src/dst. 613 * for source, perform ingress filter as well. 614 */ 615 if (stf_checkaddr4(sc, &ip->ip_dst, NULL) < 0 || 616 stf_checkaddr4(sc, &ip->ip_src, m_get_rcvif_NOMPSAFE(m)) < 0) { 617 m_freem(m); 618 return; 619 } 620 621 otos = ip->ip_tos; 622 m_adj(m, off); 623 624 if (m->m_len < sizeof(*ip6)) { 625 m = m_pullup(m, sizeof(*ip6)); 626 if (!m) 627 return; 628 } 629 ip6 = mtod(m, struct ip6_hdr *); 630 631 /* 632 * perform sanity check against inner src/dst. 633 * for source, perform ingress filter as well. 634 */ 635 if (stf_checkaddr6(sc, &ip6->ip6_dst, NULL) < 0 || 636 stf_checkaddr6(sc, &ip6->ip6_src, m_get_rcvif_NOMPSAFE(m)) < 0) { 637 m_freem(m); 638 return; 639 } 640 641 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 642 if ((ifp->if_flags & IFF_LINK1) != 0) 643 ip_ecn_egress(ECN_ALLOWED, &otos, &itos); 644 else 645 ip_ecn_egress(ECN_NOCARE, &otos, &itos); 646 ip6->ip6_flow &= ~htonl(0xff << 20); 647 ip6->ip6_flow |= htonl((uint32_t)itos << 20); 648 649 pktlen = m->m_pkthdr.len; 650 m_set_rcvif(m, ifp); 651 652 bpf_mtap_af(ifp, AF_INET6, m); 653 654 /* 655 * Put the packet to the network layer input queue according to the 656 * specified address family. 657 * See net/if_gif.c for possible issues with packet processing 658 * reorder due to extra queueing. 659 */ 660 661 s = splnet(); 662 if (__predict_true(pktq_enqueue(ip6_pktq, m, 0))) { 663 ifp->if_ipackets++; 664 ifp->if_ibytes += pktlen; 665 } else { 666 m_freem(m); 667 } 668 splx(s); 669 670 return; 671 } 672 673 /* ARGSUSED */ 674 static void 675 stf_rtrequest(int cmd, struct rtentry *rt, 676 const struct rt_addrinfo *info) 677 { 678 if (rt != NULL) { 679 struct stf_softc *sc; 680 681 sc = LIST_FIRST(&stf_softc_list); 682 rt->rt_rmx.rmx_mtu = (sc != NULL) ? sc->sc_if.if_mtu : STF_MTU; 683 } 684 } 685 686 static int 687 stf_ioctl(struct ifnet *ifp, u_long cmd, void *data) 688 { 689 struct ifaddr *ifa; 690 struct ifreq *ifr = data; 691 struct sockaddr_in6 *sin6; 692 int error; 693 694 error = 0; 695 switch (cmd) { 696 case SIOCINITIFADDR: 697 ifa = (struct ifaddr *)data; 698 if (ifa == NULL || ifa->ifa_addr->sa_family != AF_INET6) { 699 error = EAFNOSUPPORT; 700 break; 701 } 702 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 703 if (IN6_IS_ADDR_6TO4(&sin6->sin6_addr) && 704 !isrfc1918addr(GET_V4(&sin6->sin6_addr))) { 705 ifa->ifa_rtrequest = stf_rtrequest; 706 ifp->if_flags |= IFF_UP; 707 } else 708 error = EINVAL; 709 break; 710 711 case SIOCADDMULTI: 712 case SIOCDELMULTI: 713 if (ifr != NULL && 714 ifreq_getaddr(cmd, ifr)->sa_family == AF_INET6) 715 ; 716 else 717 error = EAFNOSUPPORT; 718 break; 719 720 case SIOCSIFMTU: 721 if (ifr->ifr_mtu < STF_MTU_MIN || ifr->ifr_mtu > STF_MTU_MAX) 722 return EINVAL; 723 else if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 724 error = 0; 725 break; 726 727 default: 728 error = ifioctl_common(ifp, cmd, data); 729 break; 730 } 731 732 return error; 733 } 734 735 /* 736 * Module infrastructure 737 */ 738 #include "if_module.h" 739 740 IF_MODULE(MODULE_CLASS_DRIVER, stf, "") 741