1 /* $NetBSD: if_stf.c,v 1.65 2008/02/20 17:05:53 matt 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 1.65 2008/02/20 17:05:53 matt 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 #include <sys/kauth.h> 94 95 #include <sys/cpu.h> 96 97 #include <net/if.h> 98 #include <net/route.h> 99 #include <net/netisr.h> 100 #include <net/if_types.h> 101 #include <net/if_stf.h> 102 103 #include <netinet/in.h> 104 #include <netinet/in_systm.h> 105 #include <netinet/ip.h> 106 #include <netinet/ip_var.h> 107 #include <netinet/in_var.h> 108 109 #include <netinet/ip6.h> 110 #include <netinet6/ip6_var.h> 111 #include <netinet6/in6_gif.h> 112 #include <netinet6/in6_var.h> 113 #include <netinet/ip_ecn.h> 114 115 #include <netinet/ip_encap.h> 116 117 #include <machine/stdarg.h> 118 119 #include <net/net_osdep.h> 120 121 #include "bpfilter.h" 122 #include "stf.h" 123 #include "gif.h" /*XXX*/ 124 125 #if NBPFILTER > 0 126 #include <net/bpf.h> 127 #endif 128 129 #if NGIF > 0 130 #include <net/if_gif.h> 131 #endif 132 133 #define IN6_IS_ADDR_6TO4(x) (ntohs((x)->s6_addr16[0]) == 0x2002) 134 #define GET_V4(x) ((const struct in_addr *)(&(x)->s6_addr16[1])) 135 136 struct stf_softc { 137 struct ifnet sc_if; /* common area */ 138 struct route sc_ro; 139 const struct encaptab *encap_cookie; 140 LIST_ENTRY(stf_softc) sc_list; 141 }; 142 143 static LIST_HEAD(, stf_softc) stf_softc_list; 144 145 static int stf_clone_create(struct if_clone *, int); 146 static int stf_clone_destroy(struct ifnet *); 147 148 struct if_clone stf_cloner = 149 IF_CLONE_INITIALIZER("stf", stf_clone_create, stf_clone_destroy); 150 151 #if NGIF > 0 152 extern int ip_gif_ttl; /*XXX*/ 153 #else 154 static int ip_gif_ttl = 40; /*XXX*/ 155 #endif 156 157 extern struct domain inetdomain; 158 static const struct protosw in_stf_protosw = 159 { SOCK_RAW, &inetdomain, IPPROTO_IPV6, PR_ATOMIC|PR_ADDR, 160 in_stf_input, rip_output, 0, rip_ctloutput, 161 rip_usrreq, 162 0, 0, 0, 0 163 }; 164 165 void stfattach(int); 166 167 static int stf_encapcheck(struct mbuf *, int, int, void *); 168 static struct in6_ifaddr *stf_getsrcifa6(struct ifnet *); 169 static int stf_output(struct ifnet *, struct mbuf *, const struct sockaddr *, 170 struct rtentry *); 171 static int isrfc1918addr(const struct in_addr *); 172 static int stf_checkaddr4(struct stf_softc *, const struct in_addr *, 173 struct ifnet *); 174 static int stf_checkaddr6(struct stf_softc *, const struct in6_addr *, 175 struct ifnet *); 176 static void stf_rtrequest(int, struct rtentry *, struct rt_addrinfo *); 177 static int stf_ioctl(struct ifnet *, u_long, void *); 178 179 /* ARGSUSED */ 180 void 181 stfattach(int count) 182 { 183 184 LIST_INIT(&stf_softc_list); 185 if_clone_attach(&stf_cloner); 186 } 187 188 static int 189 stf_clone_create(struct if_clone *ifc, int unit) 190 { 191 struct stf_softc *sc; 192 193 if (LIST_FIRST(&stf_softc_list) != NULL) { 194 /* Only one stf interface is allowed. */ 195 return (EEXIST); 196 } 197 198 sc = malloc(sizeof(struct stf_softc), M_DEVBUF, M_WAIT); 199 memset(sc, 0, sizeof(struct stf_softc)); 200 201 snprintf(sc->sc_if.if_xname, sizeof(sc->sc_if.if_xname), "%s%d", 202 ifc->ifc_name, unit); 203 204 sc->encap_cookie = encap_attach_func(AF_INET, IPPROTO_IPV6, 205 stf_encapcheck, &in_stf_protosw, sc); 206 if (sc->encap_cookie == NULL) { 207 printf("%s: unable to attach encap\n", if_name(&sc->sc_if)); 208 free(sc, M_DEVBUF); 209 return (EIO); /* XXX */ 210 } 211 212 sc->sc_if.if_mtu = STF_MTU; 213 sc->sc_if.if_flags = 0; 214 sc->sc_if.if_ioctl = stf_ioctl; 215 sc->sc_if.if_output = stf_output; 216 sc->sc_if.if_type = IFT_STF; 217 sc->sc_if.if_dlt = DLT_NULL; 218 if_attach(&sc->sc_if); 219 if_alloc_sadl(&sc->sc_if); 220 #if NBPFILTER > 0 221 bpfattach(&sc->sc_if, DLT_NULL, sizeof(u_int)); 222 #endif 223 LIST_INSERT_HEAD(&stf_softc_list, sc, sc_list); 224 return (0); 225 } 226 227 static int 228 stf_clone_destroy(struct ifnet *ifp) 229 { 230 struct stf_softc *sc = (void *) ifp; 231 232 LIST_REMOVE(sc, sc_list); 233 encap_detach(sc->encap_cookie); 234 #if NBPFILTER > 0 235 bpfdetach(ifp); 236 #endif 237 if_detach(ifp); 238 rtcache_free(&sc->sc_ro); 239 free(sc, M_DEVBUF); 240 241 return (0); 242 } 243 244 static int 245 stf_encapcheck(struct mbuf *m, int off, int proto, void *arg) 246 { 247 struct ip ip; 248 struct in6_ifaddr *ia6; 249 struct stf_softc *sc; 250 struct in_addr a, b; 251 252 sc = (struct stf_softc *)arg; 253 if (sc == NULL) 254 return 0; 255 256 if ((sc->sc_if.if_flags & IFF_UP) == 0) 257 return 0; 258 259 /* IFF_LINK0 means "no decapsulation" */ 260 if ((sc->sc_if.if_flags & IFF_LINK0) != 0) 261 return 0; 262 263 if (proto != IPPROTO_IPV6) 264 return 0; 265 266 m_copydata(m, 0, sizeof(ip), (void *)&ip); 267 268 if (ip.ip_v != 4) 269 return 0; 270 271 ia6 = stf_getsrcifa6(&sc->sc_if); 272 if (ia6 == NULL) 273 return 0; 274 275 /* 276 * check if IPv4 dst matches the IPv4 address derived from the 277 * local 6to4 address. 278 * success on: dst = 10.1.1.1, ia6->ia_addr = 2002:0a01:0101:... 279 */ 280 if (bcmp(GET_V4(&ia6->ia_addr.sin6_addr), &ip.ip_dst, 281 sizeof(ip.ip_dst)) != 0) 282 return 0; 283 284 /* 285 * check if IPv4 src matches the IPv4 address derived from the 286 * local 6to4 address masked by prefixmask. 287 * success on: src = 10.1.1.1, ia6->ia_addr = 2002:0a00:.../24 288 * fail on: src = 10.1.1.1, ia6->ia_addr = 2002:0b00:.../24 289 */ 290 memset(&a, 0, sizeof(a)); 291 a.s_addr = GET_V4(&ia6->ia_addr.sin6_addr)->s_addr; 292 a.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 293 b = ip.ip_src; 294 b.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 295 if (a.s_addr != b.s_addr) 296 return 0; 297 298 /* stf interface makes single side match only */ 299 return 32; 300 } 301 302 static struct in6_ifaddr * 303 stf_getsrcifa6(struct ifnet *ifp) 304 { 305 struct ifaddr *ifa; 306 struct in_ifaddr *ia4; 307 struct sockaddr_in6 *sin6; 308 struct in_addr in; 309 310 IFADDR_FOREACH(ifa, ifp) 311 { 312 if (ifa->ifa_addr == NULL) 313 continue; 314 if (ifa->ifa_addr->sa_family != AF_INET6) 315 continue; 316 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 317 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) 318 continue; 319 320 bcopy(GET_V4(&sin6->sin6_addr), &in, sizeof(in)); 321 INADDR_TO_IA(in, ia4); 322 if (ia4 == NULL) 323 continue; 324 325 return (struct in6_ifaddr *)ifa; 326 } 327 328 return NULL; 329 } 330 331 static int 332 stf_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 333 struct rtentry *rt0) 334 { 335 struct rtentry *rt; 336 struct stf_softc *sc; 337 const struct sockaddr_in6 *dst6; 338 const struct in_addr *in4; 339 uint8_t tos; 340 struct ip *ip; 341 struct ip6_hdr *ip6; 342 struct in6_ifaddr *ia6; 343 union { 344 struct sockaddr dst; 345 struct sockaddr_in dst4; 346 } u; 347 348 sc = (struct stf_softc*)ifp; 349 dst6 = (const struct sockaddr_in6 *)dst; 350 351 /* just in case */ 352 if ((ifp->if_flags & IFF_UP) == 0) { 353 m_freem(m); 354 return ENETDOWN; 355 } 356 357 /* 358 * If we don't have an ip4 address that match my inner ip6 address, 359 * we shouldn't generate output. Without this check, we'll end up 360 * using wrong IPv4 source. 361 */ 362 ia6 = stf_getsrcifa6(ifp); 363 if (ia6 == NULL) { 364 m_freem(m); 365 ifp->if_oerrors++; 366 return ENETDOWN; 367 } 368 369 if (m->m_len < sizeof(*ip6)) { 370 m = m_pullup(m, sizeof(*ip6)); 371 if (m == NULL) { 372 ifp->if_oerrors++; 373 return ENOBUFS; 374 } 375 } 376 ip6 = mtod(m, struct ip6_hdr *); 377 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 378 379 /* 380 * Pickup the right outer dst addr from the list of candidates. 381 * ip6_dst has priority as it may be able to give us shorter IPv4 hops. 382 */ 383 if (IN6_IS_ADDR_6TO4(&ip6->ip6_dst)) 384 in4 = GET_V4(&ip6->ip6_dst); 385 else if (IN6_IS_ADDR_6TO4(&dst6->sin6_addr)) 386 in4 = GET_V4(&dst6->sin6_addr); 387 else { 388 m_freem(m); 389 ifp->if_oerrors++; 390 return ENETUNREACH; 391 } 392 393 #if NBPFILTER > 0 394 if (ifp->if_bpf) 395 bpf_mtap_af(ifp->if_bpf, AF_INET6, m); 396 #endif /*NBPFILTER > 0*/ 397 398 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 399 if (m && m->m_len < sizeof(struct ip)) 400 m = m_pullup(m, sizeof(struct ip)); 401 if (m == NULL) { 402 ifp->if_oerrors++; 403 return ENOBUFS; 404 } 405 ip = mtod(m, struct ip *); 406 407 memset(ip, 0, sizeof(*ip)); 408 409 bcopy(GET_V4(&((struct sockaddr_in6 *)&ia6->ia_addr)->sin6_addr), 410 &ip->ip_src, sizeof(ip->ip_src)); 411 bcopy(in4, &ip->ip_dst, sizeof(ip->ip_dst)); 412 ip->ip_p = IPPROTO_IPV6; 413 ip->ip_ttl = ip_gif_ttl; /*XXX*/ 414 ip->ip_len = htons(m->m_pkthdr.len); 415 if (ifp->if_flags & IFF_LINK1) 416 ip_ecn_ingress(ECN_ALLOWED, &ip->ip_tos, &tos); 417 else 418 ip_ecn_ingress(ECN_NOCARE, &ip->ip_tos, &tos); 419 420 sockaddr_in_init(&u.dst4, &ip->ip_dst, 0); 421 if ((rt = rtcache_lookup(&sc->sc_ro, &u.dst)) == NULL) { 422 m_freem(m); 423 ifp->if_oerrors++; 424 return ENETUNREACH; 425 } 426 427 /* If the route constitutes infinite encapsulation, punt. */ 428 if (rt->rt_ifp == ifp) { 429 rtcache_free(&sc->sc_ro); 430 m_freem(m); 431 ifp->if_oerrors++; 432 return ENETUNREACH; 433 } 434 435 ifp->if_opackets++; 436 return ip_output(m, NULL, &sc->sc_ro, 0, NULL, NULL); 437 } 438 439 static int 440 isrfc1918addr(const struct in_addr *in) 441 { 442 /* 443 * returns 1 if private address range: 444 * 10.0.0.0/8 172.16.0.0/12 192.168.0.0/16 445 */ 446 if ((ntohl(in->s_addr) & 0xff000000) >> 24 == 10 || 447 (ntohl(in->s_addr) & 0xfff00000) >> 16 == 172 * 256 + 16 || 448 (ntohl(in->s_addr) & 0xffff0000) >> 16 == 192 * 256 + 168) 449 return 1; 450 451 return 0; 452 } 453 454 static int 455 stf_checkaddr4(struct stf_softc *sc, const struct in_addr *in, 456 struct ifnet *inifp /*incoming interface*/) 457 { 458 struct in_ifaddr *ia4; 459 460 /* 461 * reject packets with the following address: 462 * 224.0.0.0/4 0.0.0.0/8 127.0.0.0/8 255.0.0.0/8 463 */ 464 if (IN_MULTICAST(in->s_addr)) 465 return -1; 466 switch ((ntohl(in->s_addr) & 0xff000000) >> 24) { 467 case 0: case 127: case 255: 468 return -1; 469 } 470 471 /* 472 * reject packets with private address range. 473 * (requirement from RFC3056 section 2 1st paragraph) 474 */ 475 if (isrfc1918addr(in)) 476 return -1; 477 478 /* 479 * reject packet with IPv4 link-local (169.254.0.0/16), 480 * as suggested in draft-savola-v6ops-6to4-security-00.txt 481 */ 482 if (((ntohl(in->s_addr) & 0xff000000) >> 24) == 169 && 483 ((ntohl(in->s_addr) & 0x00ff0000) >> 16) == 254) 484 return -1; 485 486 /* 487 * reject packets with broadcast 488 */ 489 TAILQ_FOREACH(ia4, &in_ifaddrhead, ia_list) 490 { 491 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0) 492 continue; 493 if (in->s_addr == ia4->ia_broadaddr.sin_addr.s_addr) 494 return -1; 495 } 496 497 /* 498 * perform ingress filter 499 */ 500 if (sc && (sc->sc_if.if_flags & IFF_LINK2) == 0 && inifp) { 501 struct sockaddr_in sin; 502 struct rtentry *rt; 503 504 memset(&sin, 0, sizeof(sin)); 505 sin.sin_family = AF_INET; 506 sin.sin_len = sizeof(struct sockaddr_in); 507 sin.sin_addr = *in; 508 rt = rtalloc1((struct sockaddr *)&sin, 0); 509 if (!rt || rt->rt_ifp != inifp) { 510 #if 0 511 log(LOG_WARNING, "%s: packet from 0x%x dropped " 512 "due to ingress filter\n", if_name(&sc->sc_if), 513 (uint32_t)ntohl(sin.sin_addr.s_addr)); 514 #endif 515 if (rt) 516 rtfree(rt); 517 return -1; 518 } 519 rtfree(rt); 520 } 521 522 return 0; 523 } 524 525 static int 526 stf_checkaddr6(struct stf_softc *sc, const struct in6_addr *in6, 527 struct ifnet *inifp /*incoming interface*/) 528 { 529 530 /* 531 * check 6to4 addresses 532 */ 533 if (IN6_IS_ADDR_6TO4(in6)) 534 return stf_checkaddr4(sc, GET_V4(in6), inifp); 535 536 /* 537 * reject anything that look suspicious. the test is implemented 538 * in ip6_input too, but we check here as well to 539 * (1) reject bad packets earlier, and 540 * (2) to be safe against future ip6_input change. 541 */ 542 if (IN6_IS_ADDR_V4COMPAT(in6) || IN6_IS_ADDR_V4MAPPED(in6)) 543 return -1; 544 545 /* 546 * reject link-local and site-local unicast 547 * as suggested in draft-savola-v6ops-6to4-security-00.txt 548 */ 549 if (IN6_IS_ADDR_LINKLOCAL(in6) || IN6_IS_ADDR_SITELOCAL(in6)) 550 return -1; 551 552 /* 553 * reject node-local and link-local multicast 554 * as suggested in draft-savola-v6ops-6to4-security-00.txt 555 */ 556 if (IN6_IS_ADDR_MC_NODELOCAL(in6) || IN6_IS_ADDR_MC_LINKLOCAL(in6)) 557 return -1; 558 559 return 0; 560 } 561 562 void 563 in_stf_input(struct mbuf *m, ...) 564 { 565 int off, proto; 566 struct stf_softc *sc; 567 struct ip *ip; 568 struct ip6_hdr *ip6; 569 uint8_t otos, itos; 570 int s, isr; 571 struct ifqueue *ifq = NULL; 572 struct ifnet *ifp; 573 va_list ap; 574 575 va_start(ap, m); 576 off = va_arg(ap, int); 577 proto = va_arg(ap, int); 578 va_end(ap); 579 580 if (proto != IPPROTO_IPV6) { 581 m_freem(m); 582 return; 583 } 584 585 ip = mtod(m, struct ip *); 586 587 sc = (struct stf_softc *)encap_getarg(m); 588 589 if (sc == NULL || (sc->sc_if.if_flags & IFF_UP) == 0) { 590 m_freem(m); 591 return; 592 } 593 594 ifp = &sc->sc_if; 595 596 /* 597 * perform sanity check against outer src/dst. 598 * for source, perform ingress filter as well. 599 */ 600 if (stf_checkaddr4(sc, &ip->ip_dst, NULL) < 0 || 601 stf_checkaddr4(sc, &ip->ip_src, m->m_pkthdr.rcvif) < 0) { 602 m_freem(m); 603 return; 604 } 605 606 otos = ip->ip_tos; 607 m_adj(m, off); 608 609 if (m->m_len < sizeof(*ip6)) { 610 m = m_pullup(m, sizeof(*ip6)); 611 if (!m) 612 return; 613 } 614 ip6 = mtod(m, struct ip6_hdr *); 615 616 /* 617 * perform sanity check against inner src/dst. 618 * for source, perform ingress filter as well. 619 */ 620 if (stf_checkaddr6(sc, &ip6->ip6_dst, NULL) < 0 || 621 stf_checkaddr6(sc, &ip6->ip6_src, m->m_pkthdr.rcvif) < 0) { 622 m_freem(m); 623 return; 624 } 625 626 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 627 if ((ifp->if_flags & IFF_LINK1) != 0) 628 ip_ecn_egress(ECN_ALLOWED, &otos, &itos); 629 else 630 ip_ecn_egress(ECN_NOCARE, &otos, &itos); 631 ip6->ip6_flow &= ~htonl(0xff << 20); 632 ip6->ip6_flow |= htonl((uint32_t)itos << 20); 633 634 m->m_pkthdr.rcvif = ifp; 635 636 #if NBPFILTER > 0 637 if (ifp->if_bpf) 638 bpf_mtap_af(ifp->if_bpf, AF_INET6, m); 639 #endif /*NBPFILTER > 0*/ 640 641 /* 642 * Put the packet to the network layer input queue according to the 643 * specified address family. 644 * See net/if_gif.c for possible issues with packet processing 645 * reorder due to extra queueing. 646 */ 647 ifq = &ip6intrq; 648 isr = NETISR_IPV6; 649 650 s = splnet(); 651 if (IF_QFULL(ifq)) { 652 IF_DROP(ifq); /* update statistics */ 653 m_freem(m); 654 splx(s); 655 return; 656 } 657 IF_ENQUEUE(ifq, m); 658 schednetisr(isr); 659 ifp->if_ipackets++; 660 ifp->if_ibytes += m->m_pkthdr.len; 661 splx(s); 662 } 663 664 /* ARGSUSED */ 665 static void 666 stf_rtrequest(int cmd, struct rtentry *rt, 667 struct rt_addrinfo *info) 668 { 669 if (rt != NULL) { 670 struct stf_softc *sc; 671 672 sc = LIST_FIRST(&stf_softc_list); 673 rt->rt_rmx.rmx_mtu = (sc != NULL) ? sc->sc_if.if_mtu : STF_MTU; 674 } 675 } 676 677 static int 678 stf_ioctl(struct ifnet *ifp, u_long cmd, void *data) 679 { 680 struct lwp *l = curlwp; /* XXX */ 681 struct ifaddr *ifa; 682 struct ifreq *ifr = data; 683 struct sockaddr_in6 *sin6; 684 int error; 685 686 error = 0; 687 switch (cmd) { 688 case SIOCSIFADDR: 689 ifa = (struct ifaddr *)data; 690 if (ifa == NULL || ifa->ifa_addr->sa_family != AF_INET6) { 691 error = EAFNOSUPPORT; 692 break; 693 } 694 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 695 if (IN6_IS_ADDR_6TO4(&sin6->sin6_addr) && 696 !isrfc1918addr(GET_V4(&sin6->sin6_addr))) { 697 ifa->ifa_rtrequest = stf_rtrequest; 698 ifp->if_flags |= IFF_UP; 699 } else 700 error = EINVAL; 701 break; 702 703 case SIOCADDMULTI: 704 case SIOCDELMULTI: 705 if (ifr != NULL && 706 ifreq_getaddr(cmd, ifr)->sa_family == AF_INET6) 707 ; 708 else 709 error = EAFNOSUPPORT; 710 break; 711 712 case SIOCSIFMTU: 713 if ((error = kauth_authorize_generic(l->l_cred, 714 KAUTH_GENERIC_ISSUSER, NULL)) != 0) 715 break; 716 if (ifr->ifr_mtu < STF_MTU_MIN || ifr->ifr_mtu > STF_MTU_MAX) 717 return EINVAL; 718 else if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 719 error = 0; 720 break; 721 722 default: 723 error = EINVAL; 724 break; 725 } 726 727 return error; 728 } 729