1 /* $NetBSD: if_stf.c,v 1.74 2010/01/19 22:08:01 pooka 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 1.74 2010/01/19 22:08:01 pooka 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 "stf.h" 122 #include "gif.h" /*XXX*/ 123 124 #include <net/bpf.h> 125 126 #if NGIF > 0 127 #include <net/if_gif.h> 128 #endif 129 130 #define IN6_IS_ADDR_6TO4(x) (ntohs((x)->s6_addr16[0]) == 0x2002) 131 #define GET_V4(x) ((const struct in_addr *)(&(x)->s6_addr16[1])) 132 133 struct stf_softc { 134 struct ifnet sc_if; /* common area */ 135 struct route sc_ro; 136 const struct encaptab *encap_cookie; 137 LIST_ENTRY(stf_softc) sc_list; 138 }; 139 140 static LIST_HEAD(, stf_softc) stf_softc_list; 141 142 static int stf_clone_create(struct if_clone *, int); 143 static int stf_clone_destroy(struct ifnet *); 144 145 struct if_clone stf_cloner = 146 IF_CLONE_INITIALIZER("stf", stf_clone_create, stf_clone_destroy); 147 148 #if NGIF > 0 149 extern int ip_gif_ttl; /*XXX*/ 150 #else 151 static int ip_gif_ttl = 40; /*XXX*/ 152 #endif 153 154 extern struct domain inetdomain; 155 static const struct protosw in_stf_protosw = 156 { SOCK_RAW, &inetdomain, IPPROTO_IPV6, PR_ATOMIC|PR_ADDR, 157 in_stf_input, rip_output, 0, rip_ctloutput, 158 rip_usrreq, 159 0, 0, 0, 0 160 }; 161 162 void stfattach(int); 163 164 static int stf_encapcheck(struct mbuf *, int, int, void *); 165 static struct in6_ifaddr *stf_getsrcifa6(struct ifnet *); 166 static int stf_output(struct ifnet *, struct mbuf *, const struct sockaddr *, 167 struct rtentry *); 168 static int isrfc1918addr(const struct in_addr *); 169 static int stf_checkaddr4(struct stf_softc *, const struct in_addr *, 170 struct ifnet *); 171 static int stf_checkaddr6(struct stf_softc *, const struct in6_addr *, 172 struct ifnet *); 173 static void stf_rtrequest(int, struct rtentry *, const struct rt_addrinfo *); 174 static int stf_ioctl(struct ifnet *, u_long, void *); 175 176 /* ARGSUSED */ 177 void 178 stfattach(int count) 179 { 180 181 LIST_INIT(&stf_softc_list); 182 if_clone_attach(&stf_cloner); 183 } 184 185 static int 186 stf_clone_create(struct if_clone *ifc, int unit) 187 { 188 struct stf_softc *sc; 189 190 if (LIST_FIRST(&stf_softc_list) != NULL) { 191 /* Only one stf interface is allowed. */ 192 return (EEXIST); 193 } 194 195 sc = malloc(sizeof(struct stf_softc), M_DEVBUF, M_WAIT|M_ZERO); 196 197 if_initname(&sc->sc_if, ifc->ifc_name, unit); 198 199 sc->encap_cookie = encap_attach_func(AF_INET, IPPROTO_IPV6, 200 stf_encapcheck, &in_stf_protosw, sc); 201 if (sc->encap_cookie == NULL) { 202 printf("%s: unable to attach encap\n", if_name(&sc->sc_if)); 203 free(sc, M_DEVBUF); 204 return (EIO); /* XXX */ 205 } 206 207 sc->sc_if.if_mtu = STF_MTU; 208 sc->sc_if.if_flags = 0; 209 sc->sc_if.if_ioctl = stf_ioctl; 210 sc->sc_if.if_output = stf_output; 211 sc->sc_if.if_type = IFT_STF; 212 sc->sc_if.if_dlt = DLT_NULL; 213 if_attach(&sc->sc_if); 214 if_alloc_sadl(&sc->sc_if); 215 bpf_ops->bpf_attach(&sc->sc_if, DLT_NULL, sizeof(u_int), 216 &sc->sc_if.if_bpf); 217 LIST_INSERT_HEAD(&stf_softc_list, sc, sc_list); 218 return (0); 219 } 220 221 static int 222 stf_clone_destroy(struct ifnet *ifp) 223 { 224 struct stf_softc *sc = (void *) ifp; 225 226 LIST_REMOVE(sc, sc_list); 227 encap_detach(sc->encap_cookie); 228 bpf_ops->bpf_detach(ifp); 229 if_detach(ifp); 230 rtcache_free(&sc->sc_ro); 231 free(sc, M_DEVBUF); 232 233 return (0); 234 } 235 236 static int 237 stf_encapcheck(struct mbuf *m, int off, int proto, void *arg) 238 { 239 struct ip ip; 240 struct in6_ifaddr *ia6; 241 struct stf_softc *sc; 242 struct in_addr a, b; 243 244 sc = (struct stf_softc *)arg; 245 if (sc == NULL) 246 return 0; 247 248 if ((sc->sc_if.if_flags & IFF_UP) == 0) 249 return 0; 250 251 /* IFF_LINK0 means "no decapsulation" */ 252 if ((sc->sc_if.if_flags & IFF_LINK0) != 0) 253 return 0; 254 255 if (proto != IPPROTO_IPV6) 256 return 0; 257 258 m_copydata(m, 0, sizeof(ip), (void *)&ip); 259 260 if (ip.ip_v != 4) 261 return 0; 262 263 ia6 = stf_getsrcifa6(&sc->sc_if); 264 if (ia6 == NULL) 265 return 0; 266 267 /* 268 * check if IPv4 dst matches the IPv4 address derived from the 269 * local 6to4 address. 270 * success on: dst = 10.1.1.1, ia6->ia_addr = 2002:0a01:0101:... 271 */ 272 if (memcmp(GET_V4(&ia6->ia_addr.sin6_addr), &ip.ip_dst, 273 sizeof(ip.ip_dst)) != 0) 274 return 0; 275 276 /* 277 * check if IPv4 src matches the IPv4 address derived from the 278 * local 6to4 address masked by prefixmask. 279 * success on: src = 10.1.1.1, ia6->ia_addr = 2002:0a00:.../24 280 * fail on: src = 10.1.1.1, ia6->ia_addr = 2002:0b00:.../24 281 */ 282 memset(&a, 0, sizeof(a)); 283 a.s_addr = GET_V4(&ia6->ia_addr.sin6_addr)->s_addr; 284 a.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 285 b = ip.ip_src; 286 b.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 287 if (a.s_addr != b.s_addr) 288 return 0; 289 290 /* stf interface makes single side match only */ 291 return 32; 292 } 293 294 static struct in6_ifaddr * 295 stf_getsrcifa6(struct ifnet *ifp) 296 { 297 struct ifaddr *ifa; 298 struct in_ifaddr *ia4; 299 struct sockaddr_in6 *sin6; 300 struct in_addr in; 301 302 IFADDR_FOREACH(ifa, ifp) 303 { 304 if (ifa->ifa_addr == NULL) 305 continue; 306 if (ifa->ifa_addr->sa_family != AF_INET6) 307 continue; 308 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 309 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) 310 continue; 311 312 memcpy(&in, GET_V4(&sin6->sin6_addr), sizeof(in)); 313 INADDR_TO_IA(in, ia4); 314 if (ia4 == NULL) 315 continue; 316 317 return (struct in6_ifaddr *)ifa; 318 } 319 320 return NULL; 321 } 322 323 static int 324 stf_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 325 struct rtentry *rt0) 326 { 327 struct rtentry *rt; 328 struct stf_softc *sc; 329 const struct sockaddr_in6 *dst6; 330 const struct in_addr *in4; 331 uint8_t tos; 332 struct ip *ip; 333 struct ip6_hdr *ip6; 334 struct in6_ifaddr *ia6; 335 union { 336 struct sockaddr dst; 337 struct sockaddr_in dst4; 338 } u; 339 340 sc = (struct stf_softc*)ifp; 341 dst6 = (const struct sockaddr_in6 *)dst; 342 343 /* just in case */ 344 if ((ifp->if_flags & IFF_UP) == 0) { 345 m_freem(m); 346 return ENETDOWN; 347 } 348 349 /* 350 * If we don't have an ip4 address that match my inner ip6 address, 351 * we shouldn't generate output. Without this check, we'll end up 352 * using wrong IPv4 source. 353 */ 354 ia6 = stf_getsrcifa6(ifp); 355 if (ia6 == NULL) { 356 m_freem(m); 357 ifp->if_oerrors++; 358 return ENETDOWN; 359 } 360 361 if (m->m_len < sizeof(*ip6)) { 362 m = m_pullup(m, sizeof(*ip6)); 363 if (m == NULL) { 364 ifp->if_oerrors++; 365 return ENOBUFS; 366 } 367 } 368 ip6 = mtod(m, struct ip6_hdr *); 369 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 370 371 /* 372 * Pickup the right outer dst addr from the list of candidates. 373 * ip6_dst has priority as it may be able to give us shorter IPv4 hops. 374 */ 375 if (IN6_IS_ADDR_6TO4(&ip6->ip6_dst)) 376 in4 = GET_V4(&ip6->ip6_dst); 377 else if (IN6_IS_ADDR_6TO4(&dst6->sin6_addr)) 378 in4 = GET_V4(&dst6->sin6_addr); 379 else { 380 m_freem(m); 381 ifp->if_oerrors++; 382 return ENETUNREACH; 383 } 384 385 if (ifp->if_bpf) 386 bpf_ops->bpf_mtap_af(ifp->if_bpf, AF_INET6, m); 387 388 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 389 if (m && m->m_len < sizeof(struct ip)) 390 m = m_pullup(m, sizeof(struct ip)); 391 if (m == NULL) { 392 ifp->if_oerrors++; 393 return ENOBUFS; 394 } 395 ip = mtod(m, struct ip *); 396 397 memset(ip, 0, sizeof(*ip)); 398 399 bcopy(GET_V4(&((struct sockaddr_in6 *)&ia6->ia_addr)->sin6_addr), 400 &ip->ip_src, sizeof(ip->ip_src)); 401 memcpy(&ip->ip_dst, in4, sizeof(ip->ip_dst)); 402 ip->ip_p = IPPROTO_IPV6; 403 ip->ip_ttl = ip_gif_ttl; /*XXX*/ 404 ip->ip_len = htons(m->m_pkthdr.len); 405 if (ifp->if_flags & IFF_LINK1) 406 ip_ecn_ingress(ECN_ALLOWED, &ip->ip_tos, &tos); 407 else 408 ip_ecn_ingress(ECN_NOCARE, &ip->ip_tos, &tos); 409 410 sockaddr_in_init(&u.dst4, &ip->ip_dst, 0); 411 if ((rt = rtcache_lookup(&sc->sc_ro, &u.dst)) == NULL) { 412 m_freem(m); 413 ifp->if_oerrors++; 414 return ENETUNREACH; 415 } 416 417 /* If the route constitutes infinite encapsulation, punt. */ 418 if (rt->rt_ifp == ifp) { 419 rtcache_free(&sc->sc_ro); 420 m_freem(m); 421 ifp->if_oerrors++; 422 return ENETUNREACH; 423 } 424 425 ifp->if_opackets++; 426 ifp->if_obytes += m->m_pkthdr.len - sizeof(struct ip); 427 return ip_output(m, NULL, &sc->sc_ro, 0, NULL, NULL); 428 } 429 430 static int 431 isrfc1918addr(const struct in_addr *in) 432 { 433 /* 434 * returns 1 if private address range: 435 * 10.0.0.0/8 172.16.0.0/12 192.168.0.0/16 436 */ 437 if ((ntohl(in->s_addr) & 0xff000000) >> 24 == 10 || 438 (ntohl(in->s_addr) & 0xfff00000) >> 16 == 172 * 256 + 16 || 439 (ntohl(in->s_addr) & 0xffff0000) >> 16 == 192 * 256 + 168) 440 return 1; 441 442 return 0; 443 } 444 445 static int 446 stf_checkaddr4(struct stf_softc *sc, const struct in_addr *in, 447 struct ifnet *inifp /*incoming interface*/) 448 { 449 struct in_ifaddr *ia4; 450 451 /* 452 * reject packets with the following address: 453 * 224.0.0.0/4 0.0.0.0/8 127.0.0.0/8 255.0.0.0/8 454 */ 455 if (IN_MULTICAST(in->s_addr)) 456 return -1; 457 switch ((ntohl(in->s_addr) & 0xff000000) >> 24) { 458 case 0: case 127: case 255: 459 return -1; 460 } 461 462 /* 463 * reject packets with private address range. 464 * (requirement from RFC3056 section 2 1st paragraph) 465 */ 466 if (isrfc1918addr(in)) 467 return -1; 468 469 /* 470 * reject packet with IPv4 link-local (169.254.0.0/16), 471 * as suggested in draft-savola-v6ops-6to4-security-00.txt 472 */ 473 if (((ntohl(in->s_addr) & 0xff000000) >> 24) == 169 && 474 ((ntohl(in->s_addr) & 0x00ff0000) >> 16) == 254) 475 return -1; 476 477 /* 478 * reject packets with broadcast 479 */ 480 TAILQ_FOREACH(ia4, &in_ifaddrhead, ia_list) 481 { 482 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0) 483 continue; 484 if (in->s_addr == ia4->ia_broadaddr.sin_addr.s_addr) 485 return -1; 486 } 487 488 /* 489 * perform ingress filter 490 */ 491 if (sc && (sc->sc_if.if_flags & IFF_LINK2) == 0 && inifp) { 492 struct sockaddr_in sin; 493 struct rtentry *rt; 494 495 memset(&sin, 0, sizeof(sin)); 496 sin.sin_family = AF_INET; 497 sin.sin_len = sizeof(struct sockaddr_in); 498 sin.sin_addr = *in; 499 rt = rtalloc1((struct sockaddr *)&sin, 0); 500 if (!rt || rt->rt_ifp != inifp) { 501 #if 0 502 log(LOG_WARNING, "%s: packet from 0x%x dropped " 503 "due to ingress filter\n", if_name(&sc->sc_if), 504 (uint32_t)ntohl(sin.sin_addr.s_addr)); 505 #endif 506 if (rt) 507 rtfree(rt); 508 return -1; 509 } 510 rtfree(rt); 511 } 512 513 return 0; 514 } 515 516 static int 517 stf_checkaddr6(struct stf_softc *sc, const struct in6_addr *in6, 518 struct ifnet *inifp /*incoming interface*/) 519 { 520 521 /* 522 * check 6to4 addresses 523 */ 524 if (IN6_IS_ADDR_6TO4(in6)) 525 return stf_checkaddr4(sc, GET_V4(in6), inifp); 526 527 /* 528 * reject anything that look suspicious. the test is implemented 529 * in ip6_input too, but we check here as well to 530 * (1) reject bad packets earlier, and 531 * (2) to be safe against future ip6_input change. 532 */ 533 if (IN6_IS_ADDR_V4COMPAT(in6) || IN6_IS_ADDR_V4MAPPED(in6)) 534 return -1; 535 536 /* 537 * reject link-local and site-local unicast 538 * as suggested in draft-savola-v6ops-6to4-security-00.txt 539 */ 540 if (IN6_IS_ADDR_LINKLOCAL(in6) || IN6_IS_ADDR_SITELOCAL(in6)) 541 return -1; 542 543 /* 544 * reject node-local and link-local multicast 545 * as suggested in draft-savola-v6ops-6to4-security-00.txt 546 */ 547 if (IN6_IS_ADDR_MC_NODELOCAL(in6) || IN6_IS_ADDR_MC_LINKLOCAL(in6)) 548 return -1; 549 550 return 0; 551 } 552 553 void 554 in_stf_input(struct mbuf *m, ...) 555 { 556 int off, proto; 557 struct stf_softc *sc; 558 struct ip *ip; 559 struct ip6_hdr *ip6; 560 uint8_t otos, itos; 561 int s, isr; 562 struct ifqueue *ifq = NULL; 563 struct ifnet *ifp; 564 va_list ap; 565 566 va_start(ap, m); 567 off = va_arg(ap, int); 568 proto = va_arg(ap, int); 569 va_end(ap); 570 571 if (proto != IPPROTO_IPV6) { 572 m_freem(m); 573 return; 574 } 575 576 ip = mtod(m, struct ip *); 577 578 sc = (struct stf_softc *)encap_getarg(m); 579 580 if (sc == NULL || (sc->sc_if.if_flags & IFF_UP) == 0) { 581 m_freem(m); 582 return; 583 } 584 585 ifp = &sc->sc_if; 586 587 /* 588 * perform sanity check against outer src/dst. 589 * for source, perform ingress filter as well. 590 */ 591 if (stf_checkaddr4(sc, &ip->ip_dst, NULL) < 0 || 592 stf_checkaddr4(sc, &ip->ip_src, m->m_pkthdr.rcvif) < 0) { 593 m_freem(m); 594 return; 595 } 596 597 otos = ip->ip_tos; 598 m_adj(m, off); 599 600 if (m->m_len < sizeof(*ip6)) { 601 m = m_pullup(m, sizeof(*ip6)); 602 if (!m) 603 return; 604 } 605 ip6 = mtod(m, struct ip6_hdr *); 606 607 /* 608 * perform sanity check against inner src/dst. 609 * for source, perform ingress filter as well. 610 */ 611 if (stf_checkaddr6(sc, &ip6->ip6_dst, NULL) < 0 || 612 stf_checkaddr6(sc, &ip6->ip6_src, m->m_pkthdr.rcvif) < 0) { 613 m_freem(m); 614 return; 615 } 616 617 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 618 if ((ifp->if_flags & IFF_LINK1) != 0) 619 ip_ecn_egress(ECN_ALLOWED, &otos, &itos); 620 else 621 ip_ecn_egress(ECN_NOCARE, &otos, &itos); 622 ip6->ip6_flow &= ~htonl(0xff << 20); 623 ip6->ip6_flow |= htonl((uint32_t)itos << 20); 624 625 m->m_pkthdr.rcvif = ifp; 626 627 if (ifp->if_bpf) 628 bpf_ops->bpf_mtap_af(ifp->if_bpf, AF_INET6, m); 629 630 /* 631 * Put the packet to the network layer input queue according to the 632 * specified address family. 633 * See net/if_gif.c for possible issues with packet processing 634 * reorder due to extra queueing. 635 */ 636 ifq = &ip6intrq; 637 isr = NETISR_IPV6; 638 639 s = splnet(); 640 if (IF_QFULL(ifq)) { 641 IF_DROP(ifq); /* update statistics */ 642 m_freem(m); 643 splx(s); 644 return; 645 } 646 IF_ENQUEUE(ifq, m); 647 schednetisr(isr); 648 ifp->if_ipackets++; 649 ifp->if_ibytes += m->m_pkthdr.len; 650 splx(s); 651 } 652 653 /* ARGSUSED */ 654 static void 655 stf_rtrequest(int cmd, struct rtentry *rt, 656 const struct rt_addrinfo *info) 657 { 658 if (rt != NULL) { 659 struct stf_softc *sc; 660 661 sc = LIST_FIRST(&stf_softc_list); 662 rt->rt_rmx.rmx_mtu = (sc != NULL) ? sc->sc_if.if_mtu : STF_MTU; 663 } 664 } 665 666 static int 667 stf_ioctl(struct ifnet *ifp, u_long cmd, void *data) 668 { 669 struct lwp *l = curlwp; /* XXX */ 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 error = kauth_authorize_network(l->l_cred, 703 KAUTH_NETWORK_INTERFACE, 704 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, KAUTH_ARG(cmd), 705 NULL); 706 if (error) 707 break; 708 if (ifr->ifr_mtu < STF_MTU_MIN || ifr->ifr_mtu > STF_MTU_MAX) 709 return EINVAL; 710 else if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 711 error = 0; 712 break; 713 714 default: 715 error = ifioctl_common(ifp, cmd, data); 716 break; 717 } 718 719 return error; 720 } 721