1 /* $NetBSD: if_stf.c,v 1.45 2005/02/26 22:45:09 perry 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 1.45 2005/02/26 22:45:09 perry 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/protosw.h> 90 #include <sys/queue.h> 91 #include <sys/syslog.h> 92 #include <machine/cpu.h> 93 94 #include <net/if.h> 95 #include <net/route.h> 96 #include <net/netisr.h> 97 #include <net/if_types.h> 98 #include <net/if_stf.h> 99 100 #include <netinet/in.h> 101 #include <netinet/in_systm.h> 102 #include <netinet/ip.h> 103 #include <netinet/ip_var.h> 104 #include <netinet/in_var.h> 105 106 #include <netinet/ip6.h> 107 #include <netinet6/ip6_var.h> 108 #include <netinet6/in6_gif.h> 109 #include <netinet6/in6_var.h> 110 #include <netinet/ip_ecn.h> 111 112 #include <netinet/ip_encap.h> 113 114 #include <machine/stdarg.h> 115 116 #include <net/net_osdep.h> 117 118 #include "bpfilter.h" 119 #include "stf.h" 120 #include "gif.h" /*XXX*/ 121 122 #if NBPFILTER > 0 123 #include <net/bpf.h> 124 #endif 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) ((struct in_addr *)(&(x)->s6_addr16[1])) 132 133 struct stf_softc { 134 struct ifnet sc_if; /* common area */ 135 union { 136 struct route __sc_ro4; 137 struct route_in6 __sc_ro6; /* just for safety */ 138 } __sc_ro46; 139 #define sc_ro __sc_ro46.__sc_ro4 140 const struct encaptab *encap_cookie; 141 LIST_ENTRY(stf_softc) sc_list; 142 }; 143 144 LIST_HEAD(, stf_softc) stf_softc_list; 145 146 int stf_clone_create __P((struct if_clone *, int)); 147 int stf_clone_destroy __P((struct ifnet *)); 148 149 struct if_clone stf_cloner = 150 IF_CLONE_INITIALIZER("stf", stf_clone_create, stf_clone_destroy); 151 152 #if NGIF > 0 153 extern int ip_gif_ttl; /*XXX*/ 154 #else 155 static int ip_gif_ttl = 40; /*XXX*/ 156 #endif 157 158 extern struct domain inetdomain; 159 const struct protosw in_stf_protosw = 160 { SOCK_RAW, &inetdomain, IPPROTO_IPV6, PR_ATOMIC|PR_ADDR, 161 in_stf_input, rip_output, 0, rip_ctloutput, 162 rip_usrreq, 163 0, 0, 0, 0 164 }; 165 166 void stfattach __P((int)); 167 static int stf_encapcheck __P((const struct mbuf *, int, int, void *)); 168 static struct in6_ifaddr *stf_getsrcifa6 __P((struct ifnet *)); 169 static int stf_output __P((struct ifnet *, struct mbuf *, struct sockaddr *, 170 struct rtentry *)); 171 static int isrfc1918addr __P((struct in_addr *)); 172 static int stf_checkaddr4 __P((struct stf_softc *, struct in_addr *, 173 struct ifnet *)); 174 static int stf_checkaddr6 __P((struct stf_softc *, struct in6_addr *, 175 struct ifnet *)); 176 static void stf_rtrequest __P((int, struct rtentry *, struct rt_addrinfo *)); 177 static int stf_ioctl __P((struct ifnet *, u_long, caddr_t)); 178 179 /* ARGSUSED */ 180 void 181 stfattach(count) 182 int count; 183 { 184 185 LIST_INIT(&stf_softc_list); 186 if_clone_attach(&stf_cloner); 187 } 188 189 int 190 stf_clone_create(ifc, unit) 191 struct if_clone *ifc; 192 int unit; 193 { 194 struct stf_softc *sc; 195 196 if (LIST_FIRST(&stf_softc_list) != NULL) { 197 /* Only one stf interface is allowed. */ 198 return (EEXIST); 199 } 200 201 sc = malloc(sizeof(struct stf_softc), M_DEVBUF, M_WAIT); 202 memset(sc, 0, sizeof(struct stf_softc)); 203 204 snprintf(sc->sc_if.if_xname, sizeof(sc->sc_if.if_xname), "%s%d", 205 ifc->ifc_name, unit); 206 207 sc->encap_cookie = encap_attach_func(AF_INET, IPPROTO_IPV6, 208 stf_encapcheck, &in_stf_protosw, sc); 209 if (sc->encap_cookie == NULL) { 210 printf("%s: unable to attach encap\n", if_name(&sc->sc_if)); 211 free(sc, M_DEVBUF); 212 return (EIO); /* XXX */ 213 } 214 215 sc->sc_if.if_mtu = IPV6_MMTU; 216 sc->sc_if.if_flags = 0; 217 sc->sc_if.if_ioctl = stf_ioctl; 218 sc->sc_if.if_output = stf_output; 219 sc->sc_if.if_type = IFT_STF; 220 sc->sc_if.if_dlt = DLT_NULL; 221 if_attach(&sc->sc_if); 222 if_alloc_sadl(&sc->sc_if); 223 #if NBPFILTER > 0 224 bpfattach(&sc->sc_if, DLT_NULL, sizeof(u_int)); 225 #endif 226 LIST_INSERT_HEAD(&stf_softc_list, sc, sc_list); 227 return (0); 228 } 229 230 int 231 stf_clone_destroy(ifp) 232 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(m, off, proto, arg) 249 const struct mbuf *m; 250 int off; 251 int proto; 252 void *arg; 253 { 254 struct ip ip; 255 struct in6_ifaddr *ia6; 256 struct stf_softc *sc; 257 struct in_addr a, b; 258 259 sc = (struct stf_softc *)arg; 260 if (sc == NULL) 261 return 0; 262 263 if ((sc->sc_if.if_flags & IFF_UP) == 0) 264 return 0; 265 266 /* IFF_LINK0 means "no decapsulation" */ 267 if ((sc->sc_if.if_flags & IFF_LINK0) != 0) 268 return 0; 269 270 if (proto != IPPROTO_IPV6) 271 return 0; 272 273 /* LINTED const cast */ 274 m_copydata((struct mbuf *)m, 0, sizeof(ip), (caddr_t)&ip); 275 276 if (ip.ip_v != 4) 277 return 0; 278 279 ia6 = stf_getsrcifa6(&sc->sc_if); 280 if (ia6 == NULL) 281 return 0; 282 283 /* 284 * check if IPv4 dst matches the IPv4 address derived from the 285 * local 6to4 address. 286 * success on: dst = 10.1.1.1, ia6->ia_addr = 2002:0a01:0101:... 287 */ 288 if (bcmp(GET_V4(&ia6->ia_addr.sin6_addr), &ip.ip_dst, 289 sizeof(ip.ip_dst)) != 0) 290 return 0; 291 292 /* 293 * check if IPv4 src matches the IPv4 address derived from the 294 * local 6to4 address masked by prefixmask. 295 * success on: src = 10.1.1.1, ia6->ia_addr = 2002:0a00:.../24 296 * fail on: src = 10.1.1.1, ia6->ia_addr = 2002:0b00:.../24 297 */ 298 memset(&a, 0, sizeof(a)); 299 a.s_addr = GET_V4(&ia6->ia_addr.sin6_addr)->s_addr; 300 a.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 301 b = ip.ip_src; 302 b.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 303 if (a.s_addr != b.s_addr) 304 return 0; 305 306 /* stf interface makes single side match only */ 307 return 32; 308 } 309 310 static struct in6_ifaddr * 311 stf_getsrcifa6(ifp) 312 struct ifnet *ifp; 313 { 314 struct ifaddr *ifa; 315 struct in_ifaddr *ia4; 316 struct sockaddr_in6 *sin6; 317 struct in_addr in; 318 319 IFADDR_FOREACH(ifa, ifp) 320 { 321 if (ifa->ifa_addr == NULL) 322 continue; 323 if (ifa->ifa_addr->sa_family != AF_INET6) 324 continue; 325 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 326 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) 327 continue; 328 329 bcopy(GET_V4(&sin6->sin6_addr), &in, sizeof(in)); 330 INADDR_TO_IA(in, ia4); 331 if (ia4 == NULL) 332 continue; 333 334 return (struct in6_ifaddr *)ifa; 335 } 336 337 return NULL; 338 } 339 340 static int 341 stf_output(ifp, m, dst, rt) 342 struct ifnet *ifp; 343 struct mbuf *m; 344 struct sockaddr *dst; 345 struct rtentry *rt; 346 { 347 struct stf_softc *sc; 348 struct sockaddr_in6 *dst6; 349 struct in_addr *in4; 350 struct sockaddr_in *dst4; 351 u_int8_t tos; 352 struct ip *ip; 353 struct ip6_hdr *ip6; 354 struct in6_ifaddr *ia6; 355 356 sc = (struct stf_softc*)ifp; 357 dst6 = (struct sockaddr_in6 *)dst; 358 359 /* just in case */ 360 if ((ifp->if_flags & IFF_UP) == 0) { 361 m_freem(m); 362 return ENETDOWN; 363 } 364 365 /* 366 * If we don't have an ip4 address that match my inner ip6 address, 367 * we shouldn't generate output. Without this check, we'll end up 368 * using wrong IPv4 source. 369 */ 370 ia6 = stf_getsrcifa6(ifp); 371 if (ia6 == NULL) { 372 m_freem(m); 373 ifp->if_oerrors++; 374 return ENETDOWN; 375 } 376 377 if (m->m_len < sizeof(*ip6)) { 378 m = m_pullup(m, sizeof(*ip6)); 379 if (m == NULL) { 380 ifp->if_oerrors++; 381 return ENOBUFS; 382 } 383 } 384 ip6 = mtod(m, struct ip6_hdr *); 385 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 386 387 /* 388 * Pickup the right outer dst addr from the list of candidates. 389 * ip6_dst has priority as it may be able to give us shorter IPv4 hops. 390 */ 391 if (IN6_IS_ADDR_6TO4(&ip6->ip6_dst)) 392 in4 = GET_V4(&ip6->ip6_dst); 393 else if (IN6_IS_ADDR_6TO4(&dst6->sin6_addr)) 394 in4 = GET_V4(&dst6->sin6_addr); 395 else { 396 m_freem(m); 397 ifp->if_oerrors++; 398 return ENETUNREACH; 399 } 400 401 #if NBPFILTER > 0 402 if (ifp->if_bpf) 403 bpf_mtap_af(ifp->if_bpf, AF_INET6, m); 404 #endif /*NBPFILTER > 0*/ 405 406 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 407 if (m && m->m_len < sizeof(struct ip)) 408 m = m_pullup(m, sizeof(struct ip)); 409 if (m == NULL) { 410 ifp->if_oerrors++; 411 return ENOBUFS; 412 } 413 ip = mtod(m, struct ip *); 414 415 memset(ip, 0, sizeof(*ip)); 416 417 bcopy(GET_V4(&((struct sockaddr_in6 *)&ia6->ia_addr)->sin6_addr), 418 &ip->ip_src, sizeof(ip->ip_src)); 419 bcopy(in4, &ip->ip_dst, sizeof(ip->ip_dst)); 420 ip->ip_p = IPPROTO_IPV6; 421 ip->ip_ttl = ip_gif_ttl; /*XXX*/ 422 ip->ip_len = htons(m->m_pkthdr.len); 423 if (ifp->if_flags & IFF_LINK1) 424 ip_ecn_ingress(ECN_ALLOWED, &ip->ip_tos, &tos); 425 else 426 ip_ecn_ingress(ECN_NOCARE, &ip->ip_tos, &tos); 427 428 dst4 = (struct sockaddr_in *)&sc->sc_ro.ro_dst; 429 if (dst4->sin_family != AF_INET || 430 bcmp(&dst4->sin_addr, &ip->ip_dst, sizeof(ip->ip_dst)) != 0) { 431 /* cache route doesn't match */ 432 dst4->sin_family = AF_INET; 433 dst4->sin_len = sizeof(struct sockaddr_in); 434 bcopy(&ip->ip_dst, &dst4->sin_addr, sizeof(dst4->sin_addr)); 435 if (sc->sc_ro.ro_rt) { 436 RTFREE(sc->sc_ro.ro_rt); 437 sc->sc_ro.ro_rt = NULL; 438 } 439 } 440 441 if (sc->sc_ro.ro_rt == NULL) { 442 rtalloc(&sc->sc_ro); 443 if (sc->sc_ro.ro_rt == NULL) { 444 m_freem(m); 445 ifp->if_oerrors++; 446 return ENETUNREACH; 447 } 448 } 449 450 ifp->if_opackets++; 451 return ip_output(m, NULL, &sc->sc_ro, 0, 452 (struct ip_moptions *)NULL, (struct socket *)NULL); 453 } 454 455 static int 456 isrfc1918addr(in) 457 struct in_addr *in; 458 { 459 /* 460 * returns 1 if private address range: 461 * 10.0.0.0/8 172.16.0.0/12 192.168.0.0/16 462 */ 463 if ((ntohl(in->s_addr) & 0xff000000) >> 24 == 10 || 464 (ntohl(in->s_addr) & 0xfff00000) >> 16 == 172 * 256 + 16 || 465 (ntohl(in->s_addr) & 0xffff0000) >> 16 == 192 * 256 + 168) 466 return 1; 467 468 return 0; 469 } 470 471 static int 472 stf_checkaddr4(sc, in, inifp) 473 struct stf_softc *sc; 474 struct in_addr *in; 475 struct ifnet *inifp; /* incoming interface */ 476 { 477 struct in_ifaddr *ia4; 478 479 /* 480 * reject packets with the following address: 481 * 224.0.0.0/4 0.0.0.0/8 127.0.0.0/8 255.0.0.0/8 482 */ 483 if (IN_MULTICAST(in->s_addr)) 484 return -1; 485 switch ((ntohl(in->s_addr) & 0xff000000) >> 24) { 486 case 0: case 127: case 255: 487 return -1; 488 } 489 490 /* 491 * reject packets with private address range. 492 * (requirement from RFC3056 section 2 1st paragraph) 493 */ 494 if (isrfc1918addr(in)) 495 return -1; 496 497 /* 498 * reject packet with IPv4 link-local (169.254.0.0/16), 499 * as suggested in draft-savola-v6ops-6to4-security-00.txt 500 */ 501 if (((ntohl(in->s_addr) & 0xff000000) >> 24) == 169 && 502 ((ntohl(in->s_addr) & 0x00ff0000) >> 16) == 254) 503 return -1; 504 505 /* 506 * reject packets with broadcast 507 */ 508 TAILQ_FOREACH(ia4, &in_ifaddrhead, ia_list) 509 { 510 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0) 511 continue; 512 if (in->s_addr == ia4->ia_broadaddr.sin_addr.s_addr) 513 return -1; 514 } 515 516 /* 517 * perform ingress filter 518 */ 519 if (sc && (sc->sc_if.if_flags & IFF_LINK2) == 0 && inifp) { 520 struct sockaddr_in sin; 521 struct rtentry *rt; 522 523 memset(&sin, 0, sizeof(sin)); 524 sin.sin_family = AF_INET; 525 sin.sin_len = sizeof(struct sockaddr_in); 526 sin.sin_addr = *in; 527 rt = rtalloc1((struct sockaddr *)&sin, 0); 528 if (!rt || rt->rt_ifp != inifp) { 529 #if 0 530 log(LOG_WARNING, "%s: packet from 0x%x dropped " 531 "due to ingress filter\n", if_name(&sc->sc_if), 532 (u_int32_t)ntohl(sin.sin_addr.s_addr)); 533 #endif 534 if (rt) 535 rtfree(rt); 536 return -1; 537 } 538 rtfree(rt); 539 } 540 541 return 0; 542 } 543 544 static int 545 stf_checkaddr6(sc, in6, inifp) 546 struct stf_softc *sc; 547 struct in6_addr *in6; 548 struct ifnet *inifp; /* incoming interface */ 549 { 550 551 /* 552 * check 6to4 addresses 553 */ 554 if (IN6_IS_ADDR_6TO4(in6)) 555 return stf_checkaddr4(sc, GET_V4(in6), inifp); 556 557 /* 558 * reject anything that look suspicious. the test is implemented 559 * in ip6_input too, but we check here as well to 560 * (1) reject bad packets earlier, and 561 * (2) to be safe against future ip6_input change. 562 */ 563 if (IN6_IS_ADDR_V4COMPAT(in6) || IN6_IS_ADDR_V4MAPPED(in6)) 564 return -1; 565 566 /* 567 * reject link-local and site-local unicast 568 * as suggested in draft-savola-v6ops-6to4-security-00.txt 569 */ 570 if (IN6_IS_ADDR_LINKLOCAL(in6) || IN6_IS_ADDR_SITELOCAL(in6)) 571 return -1; 572 573 /* 574 * reject node-local and link-local multicast 575 * as suggested in draft-savola-v6ops-6to4-security-00.txt 576 */ 577 if (IN6_IS_ADDR_MC_NODELOCAL(in6) || IN6_IS_ADDR_MC_LINKLOCAL(in6)) 578 return -1; 579 580 return 0; 581 } 582 583 void 584 in_stf_input(struct mbuf *m, ...) 585 { 586 int off, proto; 587 struct stf_softc *sc; 588 struct ip *ip; 589 struct ip6_hdr *ip6; 590 u_int8_t otos, itos; 591 int s, isr; 592 struct ifqueue *ifq = NULL; 593 struct ifnet *ifp; 594 va_list ap; 595 596 va_start(ap, m); 597 off = va_arg(ap, int); 598 proto = va_arg(ap, int); 599 va_end(ap); 600 601 if (proto != IPPROTO_IPV6) { 602 m_freem(m); 603 return; 604 } 605 606 ip = mtod(m, struct ip *); 607 608 sc = (struct stf_softc *)encap_getarg(m); 609 610 if (sc == NULL || (sc->sc_if.if_flags & IFF_UP) == 0) { 611 m_freem(m); 612 return; 613 } 614 615 ifp = &sc->sc_if; 616 617 /* 618 * perform sanity check against outer src/dst. 619 * for source, perform ingress filter as well. 620 */ 621 if (stf_checkaddr4(sc, &ip->ip_dst, NULL) < 0 || 622 stf_checkaddr4(sc, &ip->ip_src, m->m_pkthdr.rcvif) < 0) { 623 m_freem(m); 624 return; 625 } 626 627 otos = ip->ip_tos; 628 m_adj(m, off); 629 630 if (m->m_len < sizeof(*ip6)) { 631 m = m_pullup(m, sizeof(*ip6)); 632 if (!m) 633 return; 634 } 635 ip6 = mtod(m, struct ip6_hdr *); 636 637 /* 638 * perform sanity check against inner src/dst. 639 * for source, perform ingress filter as well. 640 */ 641 if (stf_checkaddr6(sc, &ip6->ip6_dst, NULL) < 0 || 642 stf_checkaddr6(sc, &ip6->ip6_src, m->m_pkthdr.rcvif) < 0) { 643 m_freem(m); 644 return; 645 } 646 647 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 648 if ((ifp->if_flags & IFF_LINK1) != 0) 649 ip_ecn_egress(ECN_ALLOWED, &otos, &itos); 650 else 651 ip_ecn_egress(ECN_NOCARE, &otos, &itos); 652 ip6->ip6_flow &= ~htonl(0xff << 20); 653 ip6->ip6_flow |= htonl((u_int32_t)itos << 20); 654 655 m->m_pkthdr.rcvif = ifp; 656 657 #if NBPFILTER > 0 658 if (ifp->if_bpf) 659 bpf_mtap_af(ifp->if_bpf, AF_INET6, m); 660 #endif /*NBPFILTER > 0*/ 661 662 /* 663 * Put the packet to the network layer input queue according to the 664 * specified address family. 665 * See net/if_gif.c for possible issues with packet processing 666 * reorder due to extra queueing. 667 */ 668 ifq = &ip6intrq; 669 isr = NETISR_IPV6; 670 671 s = splnet(); 672 if (IF_QFULL(ifq)) { 673 IF_DROP(ifq); /* update statistics */ 674 m_freem(m); 675 splx(s); 676 return; 677 } 678 IF_ENQUEUE(ifq, m); 679 schednetisr(isr); 680 ifp->if_ipackets++; 681 ifp->if_ibytes += m->m_pkthdr.len; 682 splx(s); 683 } 684 685 /* ARGSUSED */ 686 static void 687 stf_rtrequest(cmd, rt, info) 688 int cmd; 689 struct rtentry *rt; 690 struct rt_addrinfo *info; 691 { 692 693 if (rt) 694 rt->rt_rmx.rmx_mtu = IPV6_MMTU; 695 } 696 697 static int 698 stf_ioctl(ifp, cmd, data) 699 struct ifnet *ifp; 700 u_long cmd; 701 caddr_t data; 702 { 703 struct ifaddr *ifa; 704 struct ifreq *ifr; 705 struct sockaddr_in6 *sin6; 706 int error; 707 708 error = 0; 709 switch (cmd) { 710 case SIOCSIFADDR: 711 ifa = (struct ifaddr *)data; 712 if (ifa == NULL || ifa->ifa_addr->sa_family != AF_INET6) { 713 error = EAFNOSUPPORT; 714 break; 715 } 716 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 717 if (IN6_IS_ADDR_6TO4(&sin6->sin6_addr) && 718 !isrfc1918addr(GET_V4(&sin6->sin6_addr))) { 719 ifa->ifa_rtrequest = stf_rtrequest; 720 ifp->if_flags |= IFF_UP; 721 } else 722 error = EINVAL; 723 break; 724 725 case SIOCADDMULTI: 726 case SIOCDELMULTI: 727 ifr = (struct ifreq *)data; 728 if (ifr && ifr->ifr_addr.sa_family == AF_INET6) 729 ; 730 else 731 error = EAFNOSUPPORT; 732 break; 733 734 default: 735 error = EINVAL; 736 break; 737 } 738 739 return error; 740 } 741