1 /* $NetBSD: if_stf.c,v 1.50 2005/12/11 23:05:25 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 1.50 2005/12/11 23:05:25 thorpej 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 <machine/cpu.h> 94 95 #include <net/if.h> 96 #include <net/route.h> 97 #include <net/netisr.h> 98 #include <net/if_types.h> 99 #include <net/if_stf.h> 100 101 #include <netinet/in.h> 102 #include <netinet/in_systm.h> 103 #include <netinet/ip.h> 104 #include <netinet/ip_var.h> 105 #include <netinet/in_var.h> 106 107 #include <netinet/ip6.h> 108 #include <netinet6/ip6_var.h> 109 #include <netinet6/in6_gif.h> 110 #include <netinet6/in6_var.h> 111 #include <netinet/ip_ecn.h> 112 113 #include <netinet/ip_encap.h> 114 115 #include <machine/stdarg.h> 116 117 #include <net/net_osdep.h> 118 119 #include "bpfilter.h" 120 #include "stf.h" 121 #include "gif.h" /*XXX*/ 122 123 #if NBPFILTER > 0 124 #include <net/bpf.h> 125 #endif 126 127 #if NGIF > 0 128 #include <net/if_gif.h> 129 #endif 130 131 #define IN6_IS_ADDR_6TO4(x) (ntohs((x)->s6_addr16[0]) == 0x2002) 132 #define GET_V4(x) ((struct in_addr *)(&(x)->s6_addr16[1])) 133 134 struct stf_softc { 135 struct ifnet sc_if; /* common area */ 136 union { 137 struct route __sc_ro4; 138 struct route_in6 __sc_ro6; /* just for safety */ 139 } __sc_ro46; 140 #define sc_ro __sc_ro46.__sc_ro4 141 const struct encaptab *encap_cookie; 142 LIST_ENTRY(stf_softc) sc_list; 143 }; 144 145 static LIST_HEAD(, stf_softc) stf_softc_list; 146 147 static int stf_clone_create(struct if_clone *, int); 148 static int stf_clone_destroy(struct ifnet *); 149 150 struct if_clone stf_cloner = 151 IF_CLONE_INITIALIZER("stf", stf_clone_create, stf_clone_destroy); 152 153 #if NGIF > 0 154 extern int ip_gif_ttl; /*XXX*/ 155 #else 156 static int ip_gif_ttl = 40; /*XXX*/ 157 #endif 158 159 extern struct domain inetdomain; 160 static const struct protosw in_stf_protosw = 161 { SOCK_RAW, &inetdomain, IPPROTO_IPV6, PR_ATOMIC|PR_ADDR, 162 in_stf_input, rip_output, 0, rip_ctloutput, 163 rip_usrreq, 164 0, 0, 0, 0 165 }; 166 167 void stfattach(int); 168 169 static int stf_encapcheck(struct mbuf *, int, int, void *); 170 static struct in6_ifaddr *stf_getsrcifa6(struct ifnet *); 171 static int stf_output(struct ifnet *, struct mbuf *, struct sockaddr *, 172 struct rtentry *); 173 static int isrfc1918addr(struct in_addr *); 174 static int stf_checkaddr4(struct stf_softc *, struct in_addr *, 175 struct ifnet *); 176 static int stf_checkaddr6(struct stf_softc *, struct in6_addr *, 177 struct ifnet *); 178 static void stf_rtrequest(int, struct rtentry *, struct rt_addrinfo *); 179 static int stf_ioctl(struct ifnet *, u_long, caddr_t); 180 181 /* ARGSUSED */ 182 void 183 stfattach(int count) 184 { 185 186 LIST_INIT(&stf_softc_list); 187 if_clone_attach(&stf_cloner); 188 } 189 190 static int 191 stf_clone_create(struct if_clone *ifc, int unit) 192 { 193 struct stf_softc *sc; 194 195 if (LIST_FIRST(&stf_softc_list) != NULL) { 196 /* Only one stf interface is allowed. */ 197 return (EEXIST); 198 } 199 200 sc = malloc(sizeof(struct stf_softc), M_DEVBUF, M_WAIT); 201 memset(sc, 0, sizeof(struct stf_softc)); 202 203 snprintf(sc->sc_if.if_xname, sizeof(sc->sc_if.if_xname), "%s%d", 204 ifc->ifc_name, unit); 205 206 sc->encap_cookie = encap_attach_func(AF_INET, IPPROTO_IPV6, 207 stf_encapcheck, &in_stf_protosw, sc); 208 if (sc->encap_cookie == NULL) { 209 printf("%s: unable to attach encap\n", if_name(&sc->sc_if)); 210 free(sc, M_DEVBUF); 211 return (EIO); /* XXX */ 212 } 213 214 sc->sc_if.if_mtu = STF_MTU; 215 sc->sc_if.if_flags = 0; 216 sc->sc_if.if_ioctl = stf_ioctl; 217 sc->sc_if.if_output = stf_output; 218 sc->sc_if.if_type = IFT_STF; 219 sc->sc_if.if_dlt = DLT_NULL; 220 if_attach(&sc->sc_if); 221 if_alloc_sadl(&sc->sc_if); 222 #if NBPFILTER > 0 223 bpfattach(&sc->sc_if, DLT_NULL, sizeof(u_int)); 224 #endif 225 LIST_INSERT_HEAD(&stf_softc_list, sc, sc_list); 226 return (0); 227 } 228 229 static int 230 stf_clone_destroy(struct ifnet *ifp) 231 { 232 struct stf_softc *sc = (void *) ifp; 233 234 LIST_REMOVE(sc, sc_list); 235 encap_detach(sc->encap_cookie); 236 #if NBPFILTER > 0 237 bpfdetach(ifp); 238 #endif 239 if_detach(ifp); 240 free(sc, M_DEVBUF); 241 242 return (0); 243 } 244 245 static int 246 stf_encapcheck(struct mbuf *m, int off, int proto, void *arg) 247 { 248 struct ip ip; 249 struct in6_ifaddr *ia6; 250 struct stf_softc *sc; 251 struct in_addr a, b; 252 253 sc = (struct stf_softc *)arg; 254 if (sc == NULL) 255 return 0; 256 257 if ((sc->sc_if.if_flags & IFF_UP) == 0) 258 return 0; 259 260 /* IFF_LINK0 means "no decapsulation" */ 261 if ((sc->sc_if.if_flags & IFF_LINK0) != 0) 262 return 0; 263 264 if (proto != IPPROTO_IPV6) 265 return 0; 266 267 m_copydata(m, 0, sizeof(ip), (caddr_t)&ip); 268 269 if (ip.ip_v != 4) 270 return 0; 271 272 ia6 = stf_getsrcifa6(&sc->sc_if); 273 if (ia6 == NULL) 274 return 0; 275 276 /* 277 * check if IPv4 dst matches the IPv4 address derived from the 278 * local 6to4 address. 279 * success on: dst = 10.1.1.1, ia6->ia_addr = 2002:0a01:0101:... 280 */ 281 if (bcmp(GET_V4(&ia6->ia_addr.sin6_addr), &ip.ip_dst, 282 sizeof(ip.ip_dst)) != 0) 283 return 0; 284 285 /* 286 * check if IPv4 src matches the IPv4 address derived from the 287 * local 6to4 address masked by prefixmask. 288 * success on: src = 10.1.1.1, ia6->ia_addr = 2002:0a00:.../24 289 * fail on: src = 10.1.1.1, ia6->ia_addr = 2002:0b00:.../24 290 */ 291 memset(&a, 0, sizeof(a)); 292 a.s_addr = GET_V4(&ia6->ia_addr.sin6_addr)->s_addr; 293 a.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 294 b = ip.ip_src; 295 b.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 296 if (a.s_addr != b.s_addr) 297 return 0; 298 299 /* stf interface makes single side match only */ 300 return 32; 301 } 302 303 static struct in6_ifaddr * 304 stf_getsrcifa6(struct ifnet *ifp) 305 { 306 struct ifaddr *ifa; 307 struct in_ifaddr *ia4; 308 struct sockaddr_in6 *sin6; 309 struct in_addr in; 310 311 IFADDR_FOREACH(ifa, ifp) 312 { 313 if (ifa->ifa_addr == NULL) 314 continue; 315 if (ifa->ifa_addr->sa_family != AF_INET6) 316 continue; 317 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 318 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) 319 continue; 320 321 bcopy(GET_V4(&sin6->sin6_addr), &in, sizeof(in)); 322 INADDR_TO_IA(in, ia4); 323 if (ia4 == NULL) 324 continue; 325 326 return (struct in6_ifaddr *)ifa; 327 } 328 329 return NULL; 330 } 331 332 static int 333 stf_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst, 334 struct rtentry *rt) 335 { 336 struct stf_softc *sc; 337 struct sockaddr_in6 *dst6; 338 struct in_addr *in4; 339 struct sockaddr_in *dst4; 340 u_int8_t tos; 341 struct ip *ip; 342 struct ip6_hdr *ip6; 343 struct in6_ifaddr *ia6; 344 345 sc = (struct stf_softc*)ifp; 346 dst6 = (struct sockaddr_in6 *)dst; 347 348 /* just in case */ 349 if ((ifp->if_flags & IFF_UP) == 0) { 350 m_freem(m); 351 return ENETDOWN; 352 } 353 354 /* 355 * If we don't have an ip4 address that match my inner ip6 address, 356 * we shouldn't generate output. Without this check, we'll end up 357 * using wrong IPv4 source. 358 */ 359 ia6 = stf_getsrcifa6(ifp); 360 if (ia6 == NULL) { 361 m_freem(m); 362 ifp->if_oerrors++; 363 return ENETDOWN; 364 } 365 366 if (m->m_len < sizeof(*ip6)) { 367 m = m_pullup(m, sizeof(*ip6)); 368 if (m == NULL) { 369 ifp->if_oerrors++; 370 return ENOBUFS; 371 } 372 } 373 ip6 = mtod(m, struct ip6_hdr *); 374 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 375 376 /* 377 * Pickup the right outer dst addr from the list of candidates. 378 * ip6_dst has priority as it may be able to give us shorter IPv4 hops. 379 */ 380 if (IN6_IS_ADDR_6TO4(&ip6->ip6_dst)) 381 in4 = GET_V4(&ip6->ip6_dst); 382 else if (IN6_IS_ADDR_6TO4(&dst6->sin6_addr)) 383 in4 = GET_V4(&dst6->sin6_addr); 384 else { 385 m_freem(m); 386 ifp->if_oerrors++; 387 return ENETUNREACH; 388 } 389 390 #if NBPFILTER > 0 391 if (ifp->if_bpf) 392 bpf_mtap_af(ifp->if_bpf, AF_INET6, m); 393 #endif /*NBPFILTER > 0*/ 394 395 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 396 if (m && m->m_len < sizeof(struct ip)) 397 m = m_pullup(m, sizeof(struct ip)); 398 if (m == NULL) { 399 ifp->if_oerrors++; 400 return ENOBUFS; 401 } 402 ip = mtod(m, struct ip *); 403 404 memset(ip, 0, sizeof(*ip)); 405 406 bcopy(GET_V4(&((struct sockaddr_in6 *)&ia6->ia_addr)->sin6_addr), 407 &ip->ip_src, sizeof(ip->ip_src)); 408 bcopy(in4, &ip->ip_dst, sizeof(ip->ip_dst)); 409 ip->ip_p = IPPROTO_IPV6; 410 ip->ip_ttl = ip_gif_ttl; /*XXX*/ 411 ip->ip_len = htons(m->m_pkthdr.len); 412 if (ifp->if_flags & IFF_LINK1) 413 ip_ecn_ingress(ECN_ALLOWED, &ip->ip_tos, &tos); 414 else 415 ip_ecn_ingress(ECN_NOCARE, &ip->ip_tos, &tos); 416 417 dst4 = (struct sockaddr_in *)&sc->sc_ro.ro_dst; 418 if (dst4->sin_family != AF_INET || 419 bcmp(&dst4->sin_addr, &ip->ip_dst, sizeof(ip->ip_dst)) != 0) { 420 /* cache route doesn't match */ 421 dst4->sin_family = AF_INET; 422 dst4->sin_len = sizeof(struct sockaddr_in); 423 bcopy(&ip->ip_dst, &dst4->sin_addr, sizeof(dst4->sin_addr)); 424 if (sc->sc_ro.ro_rt) { 425 RTFREE(sc->sc_ro.ro_rt); 426 sc->sc_ro.ro_rt = NULL; 427 } 428 } 429 430 if (sc->sc_ro.ro_rt == NULL) { 431 rtalloc(&sc->sc_ro); 432 if (sc->sc_ro.ro_rt == NULL) { 433 m_freem(m); 434 ifp->if_oerrors++; 435 return ENETUNREACH; 436 } 437 } 438 439 ifp->if_opackets++; 440 return ip_output(m, NULL, &sc->sc_ro, 0, 441 (struct ip_moptions *)NULL, (struct socket *)NULL); 442 } 443 444 static int 445 isrfc1918addr(struct in_addr *in) 446 { 447 /* 448 * returns 1 if private address range: 449 * 10.0.0.0/8 172.16.0.0/12 192.168.0.0/16 450 */ 451 if ((ntohl(in->s_addr) & 0xff000000) >> 24 == 10 || 452 (ntohl(in->s_addr) & 0xfff00000) >> 16 == 172 * 256 + 16 || 453 (ntohl(in->s_addr) & 0xffff0000) >> 16 == 192 * 256 + 168) 454 return 1; 455 456 return 0; 457 } 458 459 static int 460 stf_checkaddr4(struct stf_softc *sc, struct in_addr *in, 461 struct ifnet *inifp /*incoming interface*/) 462 { 463 struct in_ifaddr *ia4; 464 465 /* 466 * reject packets with the following address: 467 * 224.0.0.0/4 0.0.0.0/8 127.0.0.0/8 255.0.0.0/8 468 */ 469 if (IN_MULTICAST(in->s_addr)) 470 return -1; 471 switch ((ntohl(in->s_addr) & 0xff000000) >> 24) { 472 case 0: case 127: case 255: 473 return -1; 474 } 475 476 /* 477 * reject packets with private address range. 478 * (requirement from RFC3056 section 2 1st paragraph) 479 */ 480 if (isrfc1918addr(in)) 481 return -1; 482 483 /* 484 * reject packet with IPv4 link-local (169.254.0.0/16), 485 * as suggested in draft-savola-v6ops-6to4-security-00.txt 486 */ 487 if (((ntohl(in->s_addr) & 0xff000000) >> 24) == 169 && 488 ((ntohl(in->s_addr) & 0x00ff0000) >> 16) == 254) 489 return -1; 490 491 /* 492 * reject packets with broadcast 493 */ 494 TAILQ_FOREACH(ia4, &in_ifaddrhead, ia_list) 495 { 496 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0) 497 continue; 498 if (in->s_addr == ia4->ia_broadaddr.sin_addr.s_addr) 499 return -1; 500 } 501 502 /* 503 * perform ingress filter 504 */ 505 if (sc && (sc->sc_if.if_flags & IFF_LINK2) == 0 && inifp) { 506 struct sockaddr_in sin; 507 struct rtentry *rt; 508 509 memset(&sin, 0, sizeof(sin)); 510 sin.sin_family = AF_INET; 511 sin.sin_len = sizeof(struct sockaddr_in); 512 sin.sin_addr = *in; 513 rt = rtalloc1((struct sockaddr *)&sin, 0); 514 if (!rt || rt->rt_ifp != inifp) { 515 #if 0 516 log(LOG_WARNING, "%s: packet from 0x%x dropped " 517 "due to ingress filter\n", if_name(&sc->sc_if), 518 (u_int32_t)ntohl(sin.sin_addr.s_addr)); 519 #endif 520 if (rt) 521 rtfree(rt); 522 return -1; 523 } 524 rtfree(rt); 525 } 526 527 return 0; 528 } 529 530 static int 531 stf_checkaddr6(struct stf_softc *sc, struct in6_addr *in6, 532 struct ifnet *inifp /*incoming interface*/) 533 { 534 535 /* 536 * check 6to4 addresses 537 */ 538 if (IN6_IS_ADDR_6TO4(in6)) 539 return stf_checkaddr4(sc, GET_V4(in6), inifp); 540 541 /* 542 * reject anything that look suspicious. the test is implemented 543 * in ip6_input too, but we check here as well to 544 * (1) reject bad packets earlier, and 545 * (2) to be safe against future ip6_input change. 546 */ 547 if (IN6_IS_ADDR_V4COMPAT(in6) || IN6_IS_ADDR_V4MAPPED(in6)) 548 return -1; 549 550 /* 551 * reject link-local and site-local unicast 552 * as suggested in draft-savola-v6ops-6to4-security-00.txt 553 */ 554 if (IN6_IS_ADDR_LINKLOCAL(in6) || IN6_IS_ADDR_SITELOCAL(in6)) 555 return -1; 556 557 /* 558 * reject node-local and link-local multicast 559 * as suggested in draft-savola-v6ops-6to4-security-00.txt 560 */ 561 if (IN6_IS_ADDR_MC_NODELOCAL(in6) || IN6_IS_ADDR_MC_LINKLOCAL(in6)) 562 return -1; 563 564 return 0; 565 } 566 567 void 568 in_stf_input(struct mbuf *m, ...) 569 { 570 int off, proto; 571 struct stf_softc *sc; 572 struct ip *ip; 573 struct ip6_hdr *ip6; 574 u_int8_t otos, itos; 575 int s, isr; 576 struct ifqueue *ifq = NULL; 577 struct ifnet *ifp; 578 va_list ap; 579 580 va_start(ap, m); 581 off = va_arg(ap, int); 582 proto = va_arg(ap, int); 583 va_end(ap); 584 585 if (proto != IPPROTO_IPV6) { 586 m_freem(m); 587 return; 588 } 589 590 ip = mtod(m, struct ip *); 591 592 sc = (struct stf_softc *)encap_getarg(m); 593 594 if (sc == NULL || (sc->sc_if.if_flags & IFF_UP) == 0) { 595 m_freem(m); 596 return; 597 } 598 599 ifp = &sc->sc_if; 600 601 /* 602 * perform sanity check against outer src/dst. 603 * for source, perform ingress filter as well. 604 */ 605 if (stf_checkaddr4(sc, &ip->ip_dst, NULL) < 0 || 606 stf_checkaddr4(sc, &ip->ip_src, m->m_pkthdr.rcvif) < 0) { 607 m_freem(m); 608 return; 609 } 610 611 otos = ip->ip_tos; 612 m_adj(m, off); 613 614 if (m->m_len < sizeof(*ip6)) { 615 m = m_pullup(m, sizeof(*ip6)); 616 if (!m) 617 return; 618 } 619 ip6 = mtod(m, struct ip6_hdr *); 620 621 /* 622 * perform sanity check against inner src/dst. 623 * for source, perform ingress filter as well. 624 */ 625 if (stf_checkaddr6(sc, &ip6->ip6_dst, NULL) < 0 || 626 stf_checkaddr6(sc, &ip6->ip6_src, m->m_pkthdr.rcvif) < 0) { 627 m_freem(m); 628 return; 629 } 630 631 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 632 if ((ifp->if_flags & IFF_LINK1) != 0) 633 ip_ecn_egress(ECN_ALLOWED, &otos, &itos); 634 else 635 ip_ecn_egress(ECN_NOCARE, &otos, &itos); 636 ip6->ip6_flow &= ~htonl(0xff << 20); 637 ip6->ip6_flow |= htonl((u_int32_t)itos << 20); 638 639 m->m_pkthdr.rcvif = ifp; 640 641 #if NBPFILTER > 0 642 if (ifp->if_bpf) 643 bpf_mtap_af(ifp->if_bpf, AF_INET6, m); 644 #endif /*NBPFILTER > 0*/ 645 646 /* 647 * Put the packet to the network layer input queue according to the 648 * specified address family. 649 * See net/if_gif.c for possible issues with packet processing 650 * reorder due to extra queueing. 651 */ 652 ifq = &ip6intrq; 653 isr = NETISR_IPV6; 654 655 s = splnet(); 656 if (IF_QFULL(ifq)) { 657 IF_DROP(ifq); /* update statistics */ 658 m_freem(m); 659 splx(s); 660 return; 661 } 662 IF_ENQUEUE(ifq, m); 663 schednetisr(isr); 664 ifp->if_ipackets++; 665 ifp->if_ibytes += m->m_pkthdr.len; 666 splx(s); 667 } 668 669 /* ARGSUSED */ 670 static void 671 stf_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info) 672 { 673 if (rt != NULL) { 674 struct stf_softc *sc; 675 676 sc = LIST_FIRST(&stf_softc_list); 677 rt->rt_rmx.rmx_mtu = (sc != NULL) ? sc->sc_if.if_mtu : STF_MTU; 678 } 679 } 680 681 static int 682 stf_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 683 { 684 struct proc *p = curproc; /* XXX */ 685 struct ifaddr *ifa; 686 struct ifreq *ifr; 687 struct sockaddr_in6 *sin6; 688 int error; 689 u_long mtu; 690 691 error = 0; 692 switch (cmd) { 693 case SIOCSIFADDR: 694 ifa = (struct ifaddr *)data; 695 if (ifa == NULL || ifa->ifa_addr->sa_family != AF_INET6) { 696 error = EAFNOSUPPORT; 697 break; 698 } 699 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 700 if (IN6_IS_ADDR_6TO4(&sin6->sin6_addr) && 701 !isrfc1918addr(GET_V4(&sin6->sin6_addr))) { 702 ifa->ifa_rtrequest = stf_rtrequest; 703 ifp->if_flags |= IFF_UP; 704 } else 705 error = EINVAL; 706 break; 707 708 case SIOCADDMULTI: 709 case SIOCDELMULTI: 710 ifr = (struct ifreq *)data; 711 if (ifr != NULL && ifr->ifr_addr.sa_family == AF_INET6) 712 ; 713 else 714 error = EAFNOSUPPORT; 715 break; 716 717 case SIOCSIFMTU: 718 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 719 break; 720 ifr = (struct ifreq *)data; 721 mtu = ifr->ifr_mtu; 722 if (mtu < STF_MTU_MIN || mtu > STF_MTU_MAX) 723 return EINVAL; 724 ifp->if_mtu = mtu; 725 break; 726 727 default: 728 error = EINVAL; 729 break; 730 } 731 732 return error; 733 } 734