1 /* $NetBSD: if_stf.c,v 1.68 2008/11/07 00:20:13 dyoung 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 1.68 2008/11/07 00:20:13 dyoung 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 *, const 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|M_ZERO); 199 200 if_initname(&sc->sc_if, ifc->ifc_name, unit); 201 202 sc->encap_cookie = encap_attach_func(AF_INET, IPPROTO_IPV6, 203 stf_encapcheck, &in_stf_protosw, sc); 204 if (sc->encap_cookie == NULL) { 205 printf("%s: unable to attach encap\n", if_name(&sc->sc_if)); 206 free(sc, M_DEVBUF); 207 return (EIO); /* XXX */ 208 } 209 210 sc->sc_if.if_mtu = STF_MTU; 211 sc->sc_if.if_flags = 0; 212 sc->sc_if.if_ioctl = stf_ioctl; 213 sc->sc_if.if_output = stf_output; 214 sc->sc_if.if_type = IFT_STF; 215 sc->sc_if.if_dlt = DLT_NULL; 216 if_attach(&sc->sc_if); 217 if_alloc_sadl(&sc->sc_if); 218 #if NBPFILTER > 0 219 bpfattach(&sc->sc_if, DLT_NULL, sizeof(u_int)); 220 #endif 221 LIST_INSERT_HEAD(&stf_softc_list, sc, sc_list); 222 return (0); 223 } 224 225 static int 226 stf_clone_destroy(struct ifnet *ifp) 227 { 228 struct stf_softc *sc = (void *) ifp; 229 230 LIST_REMOVE(sc, sc_list); 231 encap_detach(sc->encap_cookie); 232 #if NBPFILTER > 0 233 bpfdetach(ifp); 234 #endif 235 if_detach(ifp); 236 rtcache_free(&sc->sc_ro); 237 free(sc, M_DEVBUF); 238 239 return (0); 240 } 241 242 static int 243 stf_encapcheck(struct mbuf *m, int off, int proto, void *arg) 244 { 245 struct ip ip; 246 struct in6_ifaddr *ia6; 247 struct stf_softc *sc; 248 struct in_addr a, b; 249 250 sc = (struct stf_softc *)arg; 251 if (sc == NULL) 252 return 0; 253 254 if ((sc->sc_if.if_flags & IFF_UP) == 0) 255 return 0; 256 257 /* IFF_LINK0 means "no decapsulation" */ 258 if ((sc->sc_if.if_flags & IFF_LINK0) != 0) 259 return 0; 260 261 if (proto != IPPROTO_IPV6) 262 return 0; 263 264 m_copydata(m, 0, sizeof(ip), (void *)&ip); 265 266 if (ip.ip_v != 4) 267 return 0; 268 269 ia6 = stf_getsrcifa6(&sc->sc_if); 270 if (ia6 == NULL) 271 return 0; 272 273 /* 274 * check if IPv4 dst matches the IPv4 address derived from the 275 * local 6to4 address. 276 * success on: dst = 10.1.1.1, ia6->ia_addr = 2002:0a01:0101:... 277 */ 278 if (bcmp(GET_V4(&ia6->ia_addr.sin6_addr), &ip.ip_dst, 279 sizeof(ip.ip_dst)) != 0) 280 return 0; 281 282 /* 283 * check if IPv4 src matches the IPv4 address derived from the 284 * local 6to4 address masked by prefixmask. 285 * success on: src = 10.1.1.1, ia6->ia_addr = 2002:0a00:.../24 286 * fail on: src = 10.1.1.1, ia6->ia_addr = 2002:0b00:.../24 287 */ 288 memset(&a, 0, sizeof(a)); 289 a.s_addr = GET_V4(&ia6->ia_addr.sin6_addr)->s_addr; 290 a.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 291 b = ip.ip_src; 292 b.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 293 if (a.s_addr != b.s_addr) 294 return 0; 295 296 /* stf interface makes single side match only */ 297 return 32; 298 } 299 300 static struct in6_ifaddr * 301 stf_getsrcifa6(struct ifnet *ifp) 302 { 303 struct ifaddr *ifa; 304 struct in_ifaddr *ia4; 305 struct sockaddr_in6 *sin6; 306 struct in_addr in; 307 308 IFADDR_FOREACH(ifa, ifp) 309 { 310 if (ifa->ifa_addr == NULL) 311 continue; 312 if (ifa->ifa_addr->sa_family != AF_INET6) 313 continue; 314 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 315 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) 316 continue; 317 318 bcopy(GET_V4(&sin6->sin6_addr), &in, sizeof(in)); 319 INADDR_TO_IA(in, ia4); 320 if (ia4 == NULL) 321 continue; 322 323 return (struct in6_ifaddr *)ifa; 324 } 325 326 return NULL; 327 } 328 329 static int 330 stf_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 331 struct rtentry *rt0) 332 { 333 struct rtentry *rt; 334 struct stf_softc *sc; 335 const struct sockaddr_in6 *dst6; 336 const struct in_addr *in4; 337 uint8_t tos; 338 struct ip *ip; 339 struct ip6_hdr *ip6; 340 struct in6_ifaddr *ia6; 341 union { 342 struct sockaddr dst; 343 struct sockaddr_in dst4; 344 } u; 345 346 sc = (struct stf_softc*)ifp; 347 dst6 = (const struct sockaddr_in6 *)dst; 348 349 /* just in case */ 350 if ((ifp->if_flags & IFF_UP) == 0) { 351 m_freem(m); 352 return ENETDOWN; 353 } 354 355 /* 356 * If we don't have an ip4 address that match my inner ip6 address, 357 * we shouldn't generate output. Without this check, we'll end up 358 * using wrong IPv4 source. 359 */ 360 ia6 = stf_getsrcifa6(ifp); 361 if (ia6 == NULL) { 362 m_freem(m); 363 ifp->if_oerrors++; 364 return ENETDOWN; 365 } 366 367 if (m->m_len < sizeof(*ip6)) { 368 m = m_pullup(m, sizeof(*ip6)); 369 if (m == NULL) { 370 ifp->if_oerrors++; 371 return ENOBUFS; 372 } 373 } 374 ip6 = mtod(m, struct ip6_hdr *); 375 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 376 377 /* 378 * Pickup the right outer dst addr from the list of candidates. 379 * ip6_dst has priority as it may be able to give us shorter IPv4 hops. 380 */ 381 if (IN6_IS_ADDR_6TO4(&ip6->ip6_dst)) 382 in4 = GET_V4(&ip6->ip6_dst); 383 else if (IN6_IS_ADDR_6TO4(&dst6->sin6_addr)) 384 in4 = GET_V4(&dst6->sin6_addr); 385 else { 386 m_freem(m); 387 ifp->if_oerrors++; 388 return ENETUNREACH; 389 } 390 391 #if NBPFILTER > 0 392 if (ifp->if_bpf) 393 bpf_mtap_af(ifp->if_bpf, AF_INET6, m); 394 #endif /*NBPFILTER > 0*/ 395 396 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 397 if (m && m->m_len < sizeof(struct ip)) 398 m = m_pullup(m, sizeof(struct ip)); 399 if (m == NULL) { 400 ifp->if_oerrors++; 401 return ENOBUFS; 402 } 403 ip = mtod(m, struct ip *); 404 405 memset(ip, 0, sizeof(*ip)); 406 407 bcopy(GET_V4(&((struct sockaddr_in6 *)&ia6->ia_addr)->sin6_addr), 408 &ip->ip_src, sizeof(ip->ip_src)); 409 bcopy(in4, &ip->ip_dst, sizeof(ip->ip_dst)); 410 ip->ip_p = IPPROTO_IPV6; 411 ip->ip_ttl = ip_gif_ttl; /*XXX*/ 412 ip->ip_len = htons(m->m_pkthdr.len); 413 if (ifp->if_flags & IFF_LINK1) 414 ip_ecn_ingress(ECN_ALLOWED, &ip->ip_tos, &tos); 415 else 416 ip_ecn_ingress(ECN_NOCARE, &ip->ip_tos, &tos); 417 418 sockaddr_in_init(&u.dst4, &ip->ip_dst, 0); 419 if ((rt = rtcache_lookup(&sc->sc_ro, &u.dst)) == NULL) { 420 m_freem(m); 421 ifp->if_oerrors++; 422 return ENETUNREACH; 423 } 424 425 /* If the route constitutes infinite encapsulation, punt. */ 426 if (rt->rt_ifp == ifp) { 427 rtcache_free(&sc->sc_ro); 428 m_freem(m); 429 ifp->if_oerrors++; 430 return ENETUNREACH; 431 } 432 433 ifp->if_opackets++; 434 return ip_output(m, NULL, &sc->sc_ro, 0, NULL, NULL); 435 } 436 437 static int 438 isrfc1918addr(const struct in_addr *in) 439 { 440 /* 441 * returns 1 if private address range: 442 * 10.0.0.0/8 172.16.0.0/12 192.168.0.0/16 443 */ 444 if ((ntohl(in->s_addr) & 0xff000000) >> 24 == 10 || 445 (ntohl(in->s_addr) & 0xfff00000) >> 16 == 172 * 256 + 16 || 446 (ntohl(in->s_addr) & 0xffff0000) >> 16 == 192 * 256 + 168) 447 return 1; 448 449 return 0; 450 } 451 452 static int 453 stf_checkaddr4(struct stf_softc *sc, const struct in_addr *in, 454 struct ifnet *inifp /*incoming interface*/) 455 { 456 struct in_ifaddr *ia4; 457 458 /* 459 * reject packets with the following address: 460 * 224.0.0.0/4 0.0.0.0/8 127.0.0.0/8 255.0.0.0/8 461 */ 462 if (IN_MULTICAST(in->s_addr)) 463 return -1; 464 switch ((ntohl(in->s_addr) & 0xff000000) >> 24) { 465 case 0: case 127: case 255: 466 return -1; 467 } 468 469 /* 470 * reject packets with private address range. 471 * (requirement from RFC3056 section 2 1st paragraph) 472 */ 473 if (isrfc1918addr(in)) 474 return -1; 475 476 /* 477 * reject packet with IPv4 link-local (169.254.0.0/16), 478 * as suggested in draft-savola-v6ops-6to4-security-00.txt 479 */ 480 if (((ntohl(in->s_addr) & 0xff000000) >> 24) == 169 && 481 ((ntohl(in->s_addr) & 0x00ff0000) >> 16) == 254) 482 return -1; 483 484 /* 485 * reject packets with broadcast 486 */ 487 TAILQ_FOREACH(ia4, &in_ifaddrhead, ia_list) 488 { 489 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0) 490 continue; 491 if (in->s_addr == ia4->ia_broadaddr.sin_addr.s_addr) 492 return -1; 493 } 494 495 /* 496 * perform ingress filter 497 */ 498 if (sc && (sc->sc_if.if_flags & IFF_LINK2) == 0 && inifp) { 499 struct sockaddr_in sin; 500 struct rtentry *rt; 501 502 memset(&sin, 0, sizeof(sin)); 503 sin.sin_family = AF_INET; 504 sin.sin_len = sizeof(struct sockaddr_in); 505 sin.sin_addr = *in; 506 rt = rtalloc1((struct sockaddr *)&sin, 0); 507 if (!rt || rt->rt_ifp != inifp) { 508 #if 0 509 log(LOG_WARNING, "%s: packet from 0x%x dropped " 510 "due to ingress filter\n", if_name(&sc->sc_if), 511 (uint32_t)ntohl(sin.sin_addr.s_addr)); 512 #endif 513 if (rt) 514 rtfree(rt); 515 return -1; 516 } 517 rtfree(rt); 518 } 519 520 return 0; 521 } 522 523 static int 524 stf_checkaddr6(struct stf_softc *sc, const struct in6_addr *in6, 525 struct ifnet *inifp /*incoming interface*/) 526 { 527 528 /* 529 * check 6to4 addresses 530 */ 531 if (IN6_IS_ADDR_6TO4(in6)) 532 return stf_checkaddr4(sc, GET_V4(in6), inifp); 533 534 /* 535 * reject anything that look suspicious. the test is implemented 536 * in ip6_input too, but we check here as well to 537 * (1) reject bad packets earlier, and 538 * (2) to be safe against future ip6_input change. 539 */ 540 if (IN6_IS_ADDR_V4COMPAT(in6) || IN6_IS_ADDR_V4MAPPED(in6)) 541 return -1; 542 543 /* 544 * reject link-local and site-local unicast 545 * as suggested in draft-savola-v6ops-6to4-security-00.txt 546 */ 547 if (IN6_IS_ADDR_LINKLOCAL(in6) || IN6_IS_ADDR_SITELOCAL(in6)) 548 return -1; 549 550 /* 551 * reject node-local and link-local multicast 552 * as suggested in draft-savola-v6ops-6to4-security-00.txt 553 */ 554 if (IN6_IS_ADDR_MC_NODELOCAL(in6) || IN6_IS_ADDR_MC_LINKLOCAL(in6)) 555 return -1; 556 557 return 0; 558 } 559 560 void 561 in_stf_input(struct mbuf *m, ...) 562 { 563 int off, proto; 564 struct stf_softc *sc; 565 struct ip *ip; 566 struct ip6_hdr *ip6; 567 uint8_t otos, itos; 568 int s, isr; 569 struct ifqueue *ifq = NULL; 570 struct ifnet *ifp; 571 va_list ap; 572 573 va_start(ap, m); 574 off = va_arg(ap, int); 575 proto = va_arg(ap, int); 576 va_end(ap); 577 578 if (proto != IPPROTO_IPV6) { 579 m_freem(m); 580 return; 581 } 582 583 ip = mtod(m, struct ip *); 584 585 sc = (struct stf_softc *)encap_getarg(m); 586 587 if (sc == NULL || (sc->sc_if.if_flags & IFF_UP) == 0) { 588 m_freem(m); 589 return; 590 } 591 592 ifp = &sc->sc_if; 593 594 /* 595 * perform sanity check against outer src/dst. 596 * for source, perform ingress filter as well. 597 */ 598 if (stf_checkaddr4(sc, &ip->ip_dst, NULL) < 0 || 599 stf_checkaddr4(sc, &ip->ip_src, m->m_pkthdr.rcvif) < 0) { 600 m_freem(m); 601 return; 602 } 603 604 otos = ip->ip_tos; 605 m_adj(m, off); 606 607 if (m->m_len < sizeof(*ip6)) { 608 m = m_pullup(m, sizeof(*ip6)); 609 if (!m) 610 return; 611 } 612 ip6 = mtod(m, struct ip6_hdr *); 613 614 /* 615 * perform sanity check against inner src/dst. 616 * for source, perform ingress filter as well. 617 */ 618 if (stf_checkaddr6(sc, &ip6->ip6_dst, NULL) < 0 || 619 stf_checkaddr6(sc, &ip6->ip6_src, m->m_pkthdr.rcvif) < 0) { 620 m_freem(m); 621 return; 622 } 623 624 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 625 if ((ifp->if_flags & IFF_LINK1) != 0) 626 ip_ecn_egress(ECN_ALLOWED, &otos, &itos); 627 else 628 ip_ecn_egress(ECN_NOCARE, &otos, &itos); 629 ip6->ip6_flow &= ~htonl(0xff << 20); 630 ip6->ip6_flow |= htonl((uint32_t)itos << 20); 631 632 m->m_pkthdr.rcvif = ifp; 633 634 #if NBPFILTER > 0 635 if (ifp->if_bpf) 636 bpf_mtap_af(ifp->if_bpf, AF_INET6, m); 637 #endif /*NBPFILTER > 0*/ 638 639 /* 640 * Put the packet to the network layer input queue according to the 641 * specified address family. 642 * See net/if_gif.c for possible issues with packet processing 643 * reorder due to extra queueing. 644 */ 645 ifq = &ip6intrq; 646 isr = NETISR_IPV6; 647 648 s = splnet(); 649 if (IF_QFULL(ifq)) { 650 IF_DROP(ifq); /* update statistics */ 651 m_freem(m); 652 splx(s); 653 return; 654 } 655 IF_ENQUEUE(ifq, m); 656 schednetisr(isr); 657 ifp->if_ipackets++; 658 ifp->if_ibytes += m->m_pkthdr.len; 659 splx(s); 660 } 661 662 /* ARGSUSED */ 663 static void 664 stf_rtrequest(int cmd, struct rtentry *rt, 665 const struct rt_addrinfo *info) 666 { 667 if (rt != NULL) { 668 struct stf_softc *sc; 669 670 sc = LIST_FIRST(&stf_softc_list); 671 rt->rt_rmx.rmx_mtu = (sc != NULL) ? sc->sc_if.if_mtu : STF_MTU; 672 } 673 } 674 675 static int 676 stf_ioctl(struct ifnet *ifp, u_long cmd, void *data) 677 { 678 struct lwp *l = curlwp; /* XXX */ 679 struct ifaddr *ifa; 680 struct ifreq *ifr = data; 681 struct sockaddr_in6 *sin6; 682 int error; 683 684 error = 0; 685 switch (cmd) { 686 case SIOCINITIFADDR: 687 ifa = (struct ifaddr *)data; 688 if (ifa == NULL || ifa->ifa_addr->sa_family != AF_INET6) { 689 error = EAFNOSUPPORT; 690 break; 691 } 692 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 693 if (IN6_IS_ADDR_6TO4(&sin6->sin6_addr) && 694 !isrfc1918addr(GET_V4(&sin6->sin6_addr))) { 695 ifa->ifa_rtrequest = stf_rtrequest; 696 ifp->if_flags |= IFF_UP; 697 } else 698 error = EINVAL; 699 break; 700 701 case SIOCADDMULTI: 702 case SIOCDELMULTI: 703 if (ifr != NULL && 704 ifreq_getaddr(cmd, ifr)->sa_family == AF_INET6) 705 ; 706 else 707 error = EAFNOSUPPORT; 708 break; 709 710 case SIOCSIFMTU: 711 if ((error = kauth_authorize_generic(l->l_cred, 712 KAUTH_GENERIC_ISSUSER, NULL)) != 0) 713 break; 714 if (ifr->ifr_mtu < STF_MTU_MIN || ifr->ifr_mtu > STF_MTU_MAX) 715 return EINVAL; 716 else if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 717 error = 0; 718 break; 719 720 default: 721 error = ifioctl_common(ifp, cmd, data); 722 break; 723 } 724 725 return error; 726 } 727