1 /* $NetBSD: if_stf.c,v 1.51 2006/05/14 21:19:33 elad 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 1.51 2006/05/14 21:19:33 elad 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 <machine/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) ((struct in_addr *)(&(x)->s6_addr16[1])) 135 136 struct stf_softc { 137 struct ifnet sc_if; /* common area */ 138 union { 139 struct route __sc_ro4; 140 struct route_in6 __sc_ro6; /* just for safety */ 141 } __sc_ro46; 142 #define sc_ro __sc_ro46.__sc_ro4 143 const struct encaptab *encap_cookie; 144 LIST_ENTRY(stf_softc) sc_list; 145 }; 146 147 static LIST_HEAD(, stf_softc) stf_softc_list; 148 149 static int stf_clone_create(struct if_clone *, int); 150 static int stf_clone_destroy(struct ifnet *); 151 152 struct if_clone stf_cloner = 153 IF_CLONE_INITIALIZER("stf", stf_clone_create, stf_clone_destroy); 154 155 #if NGIF > 0 156 extern int ip_gif_ttl; /*XXX*/ 157 #else 158 static int ip_gif_ttl = 40; /*XXX*/ 159 #endif 160 161 extern struct domain inetdomain; 162 static const struct protosw in_stf_protosw = 163 { SOCK_RAW, &inetdomain, IPPROTO_IPV6, PR_ATOMIC|PR_ADDR, 164 in_stf_input, rip_output, 0, rip_ctloutput, 165 rip_usrreq, 166 0, 0, 0, 0 167 }; 168 169 void stfattach(int); 170 171 static int stf_encapcheck(struct mbuf *, int, int, void *); 172 static struct in6_ifaddr *stf_getsrcifa6(struct ifnet *); 173 static int stf_output(struct ifnet *, struct mbuf *, struct sockaddr *, 174 struct rtentry *); 175 static int isrfc1918addr(struct in_addr *); 176 static int stf_checkaddr4(struct stf_softc *, struct in_addr *, 177 struct ifnet *); 178 static int stf_checkaddr6(struct stf_softc *, struct in6_addr *, 179 struct ifnet *); 180 static void stf_rtrequest(int, struct rtentry *, struct rt_addrinfo *); 181 static int stf_ioctl(struct ifnet *, u_long, caddr_t); 182 183 /* ARGSUSED */ 184 void 185 stfattach(int count) 186 { 187 188 LIST_INIT(&stf_softc_list); 189 if_clone_attach(&stf_cloner); 190 } 191 192 static int 193 stf_clone_create(struct if_clone *ifc, int unit) 194 { 195 struct stf_softc *sc; 196 197 if (LIST_FIRST(&stf_softc_list) != NULL) { 198 /* Only one stf interface is allowed. */ 199 return (EEXIST); 200 } 201 202 sc = malloc(sizeof(struct stf_softc), M_DEVBUF, M_WAIT); 203 memset(sc, 0, sizeof(struct stf_softc)); 204 205 snprintf(sc->sc_if.if_xname, sizeof(sc->sc_if.if_xname), "%s%d", 206 ifc->ifc_name, unit); 207 208 sc->encap_cookie = encap_attach_func(AF_INET, IPPROTO_IPV6, 209 stf_encapcheck, &in_stf_protosw, sc); 210 if (sc->encap_cookie == NULL) { 211 printf("%s: unable to attach encap\n", if_name(&sc->sc_if)); 212 free(sc, M_DEVBUF); 213 return (EIO); /* XXX */ 214 } 215 216 sc->sc_if.if_mtu = STF_MTU; 217 sc->sc_if.if_flags = 0; 218 sc->sc_if.if_ioctl = stf_ioctl; 219 sc->sc_if.if_output = stf_output; 220 sc->sc_if.if_type = IFT_STF; 221 sc->sc_if.if_dlt = DLT_NULL; 222 if_attach(&sc->sc_if); 223 if_alloc_sadl(&sc->sc_if); 224 #if NBPFILTER > 0 225 bpfattach(&sc->sc_if, DLT_NULL, sizeof(u_int)); 226 #endif 227 LIST_INSERT_HEAD(&stf_softc_list, sc, sc_list); 228 return (0); 229 } 230 231 static int 232 stf_clone_destroy(struct ifnet *ifp) 233 { 234 struct stf_softc *sc = (void *) ifp; 235 236 LIST_REMOVE(sc, sc_list); 237 encap_detach(sc->encap_cookie); 238 #if NBPFILTER > 0 239 bpfdetach(ifp); 240 #endif 241 if_detach(ifp); 242 free(sc, M_DEVBUF); 243 244 return (0); 245 } 246 247 static int 248 stf_encapcheck(struct mbuf *m, int off, int proto, void *arg) 249 { 250 struct ip ip; 251 struct in6_ifaddr *ia6; 252 struct stf_softc *sc; 253 struct in_addr a, b; 254 255 sc = (struct stf_softc *)arg; 256 if (sc == NULL) 257 return 0; 258 259 if ((sc->sc_if.if_flags & IFF_UP) == 0) 260 return 0; 261 262 /* IFF_LINK0 means "no decapsulation" */ 263 if ((sc->sc_if.if_flags & IFF_LINK0) != 0) 264 return 0; 265 266 if (proto != IPPROTO_IPV6) 267 return 0; 268 269 m_copydata(m, 0, sizeof(ip), (caddr_t)&ip); 270 271 if (ip.ip_v != 4) 272 return 0; 273 274 ia6 = stf_getsrcifa6(&sc->sc_if); 275 if (ia6 == NULL) 276 return 0; 277 278 /* 279 * check if IPv4 dst matches the IPv4 address derived from the 280 * local 6to4 address. 281 * success on: dst = 10.1.1.1, ia6->ia_addr = 2002:0a01:0101:... 282 */ 283 if (bcmp(GET_V4(&ia6->ia_addr.sin6_addr), &ip.ip_dst, 284 sizeof(ip.ip_dst)) != 0) 285 return 0; 286 287 /* 288 * check if IPv4 src matches the IPv4 address derived from the 289 * local 6to4 address masked by prefixmask. 290 * success on: src = 10.1.1.1, ia6->ia_addr = 2002:0a00:.../24 291 * fail on: src = 10.1.1.1, ia6->ia_addr = 2002:0b00:.../24 292 */ 293 memset(&a, 0, sizeof(a)); 294 a.s_addr = GET_V4(&ia6->ia_addr.sin6_addr)->s_addr; 295 a.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 296 b = ip.ip_src; 297 b.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 298 if (a.s_addr != b.s_addr) 299 return 0; 300 301 /* stf interface makes single side match only */ 302 return 32; 303 } 304 305 static struct in6_ifaddr * 306 stf_getsrcifa6(struct ifnet *ifp) 307 { 308 struct ifaddr *ifa; 309 struct in_ifaddr *ia4; 310 struct sockaddr_in6 *sin6; 311 struct in_addr in; 312 313 IFADDR_FOREACH(ifa, ifp) 314 { 315 if (ifa->ifa_addr == NULL) 316 continue; 317 if (ifa->ifa_addr->sa_family != AF_INET6) 318 continue; 319 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 320 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) 321 continue; 322 323 bcopy(GET_V4(&sin6->sin6_addr), &in, sizeof(in)); 324 INADDR_TO_IA(in, ia4); 325 if (ia4 == NULL) 326 continue; 327 328 return (struct in6_ifaddr *)ifa; 329 } 330 331 return NULL; 332 } 333 334 static int 335 stf_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst, 336 struct rtentry *rt) 337 { 338 struct stf_softc *sc; 339 struct sockaddr_in6 *dst6; 340 struct in_addr *in4; 341 struct sockaddr_in *dst4; 342 u_int8_t tos; 343 struct ip *ip; 344 struct ip6_hdr *ip6; 345 struct in6_ifaddr *ia6; 346 347 sc = (struct stf_softc*)ifp; 348 dst6 = (struct sockaddr_in6 *)dst; 349 350 /* just in case */ 351 if ((ifp->if_flags & IFF_UP) == 0) { 352 m_freem(m); 353 return ENETDOWN; 354 } 355 356 /* 357 * If we don't have an ip4 address that match my inner ip6 address, 358 * we shouldn't generate output. Without this check, we'll end up 359 * using wrong IPv4 source. 360 */ 361 ia6 = stf_getsrcifa6(ifp); 362 if (ia6 == NULL) { 363 m_freem(m); 364 ifp->if_oerrors++; 365 return ENETDOWN; 366 } 367 368 if (m->m_len < sizeof(*ip6)) { 369 m = m_pullup(m, sizeof(*ip6)); 370 if (m == NULL) { 371 ifp->if_oerrors++; 372 return ENOBUFS; 373 } 374 } 375 ip6 = mtod(m, struct ip6_hdr *); 376 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 377 378 /* 379 * Pickup the right outer dst addr from the list of candidates. 380 * ip6_dst has priority as it may be able to give us shorter IPv4 hops. 381 */ 382 if (IN6_IS_ADDR_6TO4(&ip6->ip6_dst)) 383 in4 = GET_V4(&ip6->ip6_dst); 384 else if (IN6_IS_ADDR_6TO4(&dst6->sin6_addr)) 385 in4 = GET_V4(&dst6->sin6_addr); 386 else { 387 m_freem(m); 388 ifp->if_oerrors++; 389 return ENETUNREACH; 390 } 391 392 #if NBPFILTER > 0 393 if (ifp->if_bpf) 394 bpf_mtap_af(ifp->if_bpf, AF_INET6, m); 395 #endif /*NBPFILTER > 0*/ 396 397 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 398 if (m && m->m_len < sizeof(struct ip)) 399 m = m_pullup(m, sizeof(struct ip)); 400 if (m == NULL) { 401 ifp->if_oerrors++; 402 return ENOBUFS; 403 } 404 ip = mtod(m, struct ip *); 405 406 memset(ip, 0, sizeof(*ip)); 407 408 bcopy(GET_V4(&((struct sockaddr_in6 *)&ia6->ia_addr)->sin6_addr), 409 &ip->ip_src, sizeof(ip->ip_src)); 410 bcopy(in4, &ip->ip_dst, sizeof(ip->ip_dst)); 411 ip->ip_p = IPPROTO_IPV6; 412 ip->ip_ttl = ip_gif_ttl; /*XXX*/ 413 ip->ip_len = htons(m->m_pkthdr.len); 414 if (ifp->if_flags & IFF_LINK1) 415 ip_ecn_ingress(ECN_ALLOWED, &ip->ip_tos, &tos); 416 else 417 ip_ecn_ingress(ECN_NOCARE, &ip->ip_tos, &tos); 418 419 dst4 = (struct sockaddr_in *)&sc->sc_ro.ro_dst; 420 if (dst4->sin_family != AF_INET || 421 bcmp(&dst4->sin_addr, &ip->ip_dst, sizeof(ip->ip_dst)) != 0) { 422 /* cache route doesn't match */ 423 dst4->sin_family = AF_INET; 424 dst4->sin_len = sizeof(struct sockaddr_in); 425 bcopy(&ip->ip_dst, &dst4->sin_addr, sizeof(dst4->sin_addr)); 426 if (sc->sc_ro.ro_rt) { 427 RTFREE(sc->sc_ro.ro_rt); 428 sc->sc_ro.ro_rt = NULL; 429 } 430 } 431 432 if (sc->sc_ro.ro_rt == NULL) { 433 rtalloc(&sc->sc_ro); 434 if (sc->sc_ro.ro_rt == NULL) { 435 m_freem(m); 436 ifp->if_oerrors++; 437 return ENETUNREACH; 438 } 439 } 440 441 ifp->if_opackets++; 442 return ip_output(m, NULL, &sc->sc_ro, 0, 443 (struct ip_moptions *)NULL, (struct socket *)NULL); 444 } 445 446 static int 447 isrfc1918addr(struct in_addr *in) 448 { 449 /* 450 * returns 1 if private address range: 451 * 10.0.0.0/8 172.16.0.0/12 192.168.0.0/16 452 */ 453 if ((ntohl(in->s_addr) & 0xff000000) >> 24 == 10 || 454 (ntohl(in->s_addr) & 0xfff00000) >> 16 == 172 * 256 + 16 || 455 (ntohl(in->s_addr) & 0xffff0000) >> 16 == 192 * 256 + 168) 456 return 1; 457 458 return 0; 459 } 460 461 static int 462 stf_checkaddr4(struct stf_softc *sc, struct in_addr *in, 463 struct ifnet *inifp /*incoming interface*/) 464 { 465 struct in_ifaddr *ia4; 466 467 /* 468 * reject packets with the following address: 469 * 224.0.0.0/4 0.0.0.0/8 127.0.0.0/8 255.0.0.0/8 470 */ 471 if (IN_MULTICAST(in->s_addr)) 472 return -1; 473 switch ((ntohl(in->s_addr) & 0xff000000) >> 24) { 474 case 0: case 127: case 255: 475 return -1; 476 } 477 478 /* 479 * reject packets with private address range. 480 * (requirement from RFC3056 section 2 1st paragraph) 481 */ 482 if (isrfc1918addr(in)) 483 return -1; 484 485 /* 486 * reject packet with IPv4 link-local (169.254.0.0/16), 487 * as suggested in draft-savola-v6ops-6to4-security-00.txt 488 */ 489 if (((ntohl(in->s_addr) & 0xff000000) >> 24) == 169 && 490 ((ntohl(in->s_addr) & 0x00ff0000) >> 16) == 254) 491 return -1; 492 493 /* 494 * reject packets with broadcast 495 */ 496 TAILQ_FOREACH(ia4, &in_ifaddrhead, ia_list) 497 { 498 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0) 499 continue; 500 if (in->s_addr == ia4->ia_broadaddr.sin_addr.s_addr) 501 return -1; 502 } 503 504 /* 505 * perform ingress filter 506 */ 507 if (sc && (sc->sc_if.if_flags & IFF_LINK2) == 0 && inifp) { 508 struct sockaddr_in sin; 509 struct rtentry *rt; 510 511 memset(&sin, 0, sizeof(sin)); 512 sin.sin_family = AF_INET; 513 sin.sin_len = sizeof(struct sockaddr_in); 514 sin.sin_addr = *in; 515 rt = rtalloc1((struct sockaddr *)&sin, 0); 516 if (!rt || rt->rt_ifp != inifp) { 517 #if 0 518 log(LOG_WARNING, "%s: packet from 0x%x dropped " 519 "due to ingress filter\n", if_name(&sc->sc_if), 520 (u_int32_t)ntohl(sin.sin_addr.s_addr)); 521 #endif 522 if (rt) 523 rtfree(rt); 524 return -1; 525 } 526 rtfree(rt); 527 } 528 529 return 0; 530 } 531 532 static int 533 stf_checkaddr6(struct stf_softc *sc, struct in6_addr *in6, 534 struct ifnet *inifp /*incoming interface*/) 535 { 536 537 /* 538 * check 6to4 addresses 539 */ 540 if (IN6_IS_ADDR_6TO4(in6)) 541 return stf_checkaddr4(sc, GET_V4(in6), inifp); 542 543 /* 544 * reject anything that look suspicious. the test is implemented 545 * in ip6_input too, but we check here as well to 546 * (1) reject bad packets earlier, and 547 * (2) to be safe against future ip6_input change. 548 */ 549 if (IN6_IS_ADDR_V4COMPAT(in6) || IN6_IS_ADDR_V4MAPPED(in6)) 550 return -1; 551 552 /* 553 * reject link-local and site-local unicast 554 * as suggested in draft-savola-v6ops-6to4-security-00.txt 555 */ 556 if (IN6_IS_ADDR_LINKLOCAL(in6) || IN6_IS_ADDR_SITELOCAL(in6)) 557 return -1; 558 559 /* 560 * reject node-local and link-local multicast 561 * as suggested in draft-savola-v6ops-6to4-security-00.txt 562 */ 563 if (IN6_IS_ADDR_MC_NODELOCAL(in6) || IN6_IS_ADDR_MC_LINKLOCAL(in6)) 564 return -1; 565 566 return 0; 567 } 568 569 void 570 in_stf_input(struct mbuf *m, ...) 571 { 572 int off, proto; 573 struct stf_softc *sc; 574 struct ip *ip; 575 struct ip6_hdr *ip6; 576 u_int8_t otos, itos; 577 int s, isr; 578 struct ifqueue *ifq = NULL; 579 struct ifnet *ifp; 580 va_list ap; 581 582 va_start(ap, m); 583 off = va_arg(ap, int); 584 proto = va_arg(ap, int); 585 va_end(ap); 586 587 if (proto != IPPROTO_IPV6) { 588 m_freem(m); 589 return; 590 } 591 592 ip = mtod(m, struct ip *); 593 594 sc = (struct stf_softc *)encap_getarg(m); 595 596 if (sc == NULL || (sc->sc_if.if_flags & IFF_UP) == 0) { 597 m_freem(m); 598 return; 599 } 600 601 ifp = &sc->sc_if; 602 603 /* 604 * perform sanity check against outer src/dst. 605 * for source, perform ingress filter as well. 606 */ 607 if (stf_checkaddr4(sc, &ip->ip_dst, NULL) < 0 || 608 stf_checkaddr4(sc, &ip->ip_src, m->m_pkthdr.rcvif) < 0) { 609 m_freem(m); 610 return; 611 } 612 613 otos = ip->ip_tos; 614 m_adj(m, off); 615 616 if (m->m_len < sizeof(*ip6)) { 617 m = m_pullup(m, sizeof(*ip6)); 618 if (!m) 619 return; 620 } 621 ip6 = mtod(m, struct ip6_hdr *); 622 623 /* 624 * perform sanity check against inner src/dst. 625 * for source, perform ingress filter as well. 626 */ 627 if (stf_checkaddr6(sc, &ip6->ip6_dst, NULL) < 0 || 628 stf_checkaddr6(sc, &ip6->ip6_src, m->m_pkthdr.rcvif) < 0) { 629 m_freem(m); 630 return; 631 } 632 633 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 634 if ((ifp->if_flags & IFF_LINK1) != 0) 635 ip_ecn_egress(ECN_ALLOWED, &otos, &itos); 636 else 637 ip_ecn_egress(ECN_NOCARE, &otos, &itos); 638 ip6->ip6_flow &= ~htonl(0xff << 20); 639 ip6->ip6_flow |= htonl((u_int32_t)itos << 20); 640 641 m->m_pkthdr.rcvif = ifp; 642 643 #if NBPFILTER > 0 644 if (ifp->if_bpf) 645 bpf_mtap_af(ifp->if_bpf, AF_INET6, m); 646 #endif /*NBPFILTER > 0*/ 647 648 /* 649 * Put the packet to the network layer input queue according to the 650 * specified address family. 651 * See net/if_gif.c for possible issues with packet processing 652 * reorder due to extra queueing. 653 */ 654 ifq = &ip6intrq; 655 isr = NETISR_IPV6; 656 657 s = splnet(); 658 if (IF_QFULL(ifq)) { 659 IF_DROP(ifq); /* update statistics */ 660 m_freem(m); 661 splx(s); 662 return; 663 } 664 IF_ENQUEUE(ifq, m); 665 schednetisr(isr); 666 ifp->if_ipackets++; 667 ifp->if_ibytes += m->m_pkthdr.len; 668 splx(s); 669 } 670 671 /* ARGSUSED */ 672 static void 673 stf_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info) 674 { 675 if (rt != NULL) { 676 struct stf_softc *sc; 677 678 sc = LIST_FIRST(&stf_softc_list); 679 rt->rt_rmx.rmx_mtu = (sc != NULL) ? sc->sc_if.if_mtu : STF_MTU; 680 } 681 } 682 683 static int 684 stf_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 685 { 686 struct proc *p = curproc; /* XXX */ 687 struct ifaddr *ifa; 688 struct ifreq *ifr; 689 struct sockaddr_in6 *sin6; 690 int error; 691 u_long mtu; 692 693 error = 0; 694 switch (cmd) { 695 case SIOCSIFADDR: 696 ifa = (struct ifaddr *)data; 697 if (ifa == NULL || ifa->ifa_addr->sa_family != AF_INET6) { 698 error = EAFNOSUPPORT; 699 break; 700 } 701 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 702 if (IN6_IS_ADDR_6TO4(&sin6->sin6_addr) && 703 !isrfc1918addr(GET_V4(&sin6->sin6_addr))) { 704 ifa->ifa_rtrequest = stf_rtrequest; 705 ifp->if_flags |= IFF_UP; 706 } else 707 error = EINVAL; 708 break; 709 710 case SIOCADDMULTI: 711 case SIOCDELMULTI: 712 ifr = (struct ifreq *)data; 713 if (ifr != NULL && ifr->ifr_addr.sa_family == AF_INET6) 714 ; 715 else 716 error = EAFNOSUPPORT; 717 break; 718 719 case SIOCSIFMTU: 720 if ((error = kauth_authorize_generic(p->p_cred, KAUTH_GENERIC_ISSUSER, &p->p_acflag)) != 0) 721 break; 722 ifr = (struct ifreq *)data; 723 mtu = ifr->ifr_mtu; 724 if (mtu < STF_MTU_MIN || mtu > STF_MTU_MAX) 725 return EINVAL; 726 ifp->if_mtu = mtu; 727 break; 728 729 default: 730 error = EINVAL; 731 break; 732 } 733 734 return error; 735 } 736