if_stf.c revision 1.20
1 /* $NetBSD: if_stf.c,v 1.20 2001/11/06 08:14:27 itojun 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 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 78 #include "opt_inet.h" 79 #include "opt_inet6.h" 80 #endif 81 #ifdef __NetBSD__ 82 #include "opt_inet.h" 83 #endif 84 85 #include <sys/param.h> 86 #include <sys/systm.h> 87 #include <sys/socket.h> 88 #include <sys/sockio.h> 89 #include <sys/mbuf.h> 90 #include <sys/errno.h> 91 #if !(defined(__FreeBSD__) && __FreeBSD__ >= 3) 92 #include <sys/ioctl.h> 93 #endif 94 #include <sys/protosw.h> 95 #ifdef __FreeBSD__ 96 #include <sys/kernel.h> 97 #endif 98 #include <sys/queue.h> 99 #include <sys/syslog.h> 100 #include <machine/cpu.h> 101 102 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 103 #include <sys/malloc.h> 104 #endif 105 106 #include <net/if.h> 107 #include <net/route.h> 108 #include <net/netisr.h> 109 #include <net/if_types.h> 110 #include <net/if_stf.h> 111 112 #include <netinet/in.h> 113 #include <netinet/in_systm.h> 114 #include <netinet/ip.h> 115 #include <netinet/ip_var.h> 116 #include <netinet/in_var.h> 117 118 #include <netinet/ip6.h> 119 #include <netinet6/ip6_var.h> 120 #include <netinet6/in6_gif.h> 121 #include <netinet6/in6_var.h> 122 #include <netinet/ip_ecn.h> 123 124 #include <netinet/ip_encap.h> 125 126 #include <machine/stdarg.h> 127 128 #include <net/net_osdep.h> 129 130 #if defined(__FreeBSD__) && __FreeBSD__ >= 4 131 #include "bpf.h" 132 #define NBPFILTER NBPF 133 #else 134 #include "bpfilter.h" 135 #endif 136 #include "stf.h" 137 #include "gif.h" /*XXX*/ 138 139 #if NBPFILTER > 0 140 #include <net/bpf.h> 141 #endif 142 143 #if NGIF > 0 144 #include <net/if_gif.h> 145 #endif 146 147 #if NSTF > 0 148 149 #define IN6_IS_ADDR_6TO4(x) (ntohs((x)->s6_addr16[0]) == 0x2002) 150 #define GET_V4(x) ((struct in_addr *)(&(x)->s6_addr16[1])) 151 152 struct stf_softc { 153 struct ifnet sc_if; /* common area */ 154 union { 155 struct route __sc_ro4; 156 struct route_in6 __sc_ro6; /* just for safety */ 157 } __sc_ro46; 158 #define sc_ro __sc_ro46.__sc_ro4 159 const struct encaptab *encap_cookie; 160 LIST_ENTRY(stf_softc) sc_list; 161 }; 162 163 LIST_HEAD(, stf_softc) stf_softc_list; 164 165 int stf_clone_create __P((struct if_clone *, int)); 166 void stf_clone_destroy __P((struct ifnet *)); 167 168 struct if_clone stf_cloner = 169 IF_CLONE_INITIALIZER("stf", stf_clone_create, stf_clone_destroy); 170 171 #if NGIF > 0 172 extern int ip_gif_ttl; /*XXX*/ 173 #else 174 static int ip_gif_ttl = 40; /*XXX*/ 175 #endif 176 177 extern struct protosw in_stf_protosw; 178 179 #ifdef __FreeBSD__ 180 void stfattach __P((void *)); 181 #else 182 void stfattach __P((int)); 183 #endif 184 static int stf_encapcheck __P((const struct mbuf *, int, int, void *)); 185 static struct in6_ifaddr *stf_getsrcifa6 __P((struct ifnet *)); 186 static int stf_output __P((struct ifnet *, struct mbuf *, struct sockaddr *, 187 struct rtentry *)); 188 static int stf_checkaddr4 __P((struct stf_softc *, struct in_addr *, 189 struct ifnet *)); 190 static int stf_checkaddr6 __P((struct stf_softc *, struct in6_addr *, 191 struct ifnet *)); 192 static void stf_rtrequest __P((int, struct rtentry *, struct rt_addrinfo *)); 193 #if defined(__FreeBSD__) && __FreeBSD__ < 3 194 static int stf_ioctl __P((struct ifnet *, int, caddr_t)); 195 #else 196 static int stf_ioctl __P((struct ifnet *, u_long, caddr_t)); 197 #endif 198 199 /* ARGSUSED */ 200 void 201 stfattach(count) 202 int count; 203 { 204 205 LIST_INIT(&stf_softc_list); 206 if_clone_attach(&stf_cloner); 207 } 208 209 int 210 stf_clone_create(ifc, unit) 211 struct if_clone *ifc; 212 int unit; 213 { 214 struct stf_softc *sc; 215 216 if (LIST_FIRST(&stf_softc_list) != NULL) { 217 /* Only one stf interface is allowed. */ 218 return (EEXIST); 219 } 220 221 sc = malloc(sizeof(struct stf_softc), M_DEVBUF, M_WAIT); 222 memset(sc, 0, sizeof(struct stf_softc)); 223 224 sprintf(sc->sc_if.if_xname, "%s%d", ifc->ifc_name, unit); 225 226 sc->encap_cookie = encap_attach_func(AF_INET, IPPROTO_IPV6, 227 stf_encapcheck, &in_stf_protosw, sc); 228 if (sc->encap_cookie == NULL) { 229 printf("%s: unable to attach encap\n", if_name(&sc->sc_if)); 230 free(sc, M_DEVBUF); 231 return (EIO); /* XXX */ 232 } 233 234 sc->sc_if.if_mtu = IPV6_MMTU; 235 sc->sc_if.if_flags = 0; 236 sc->sc_if.if_ioctl = stf_ioctl; 237 sc->sc_if.if_output = stf_output; 238 sc->sc_if.if_type = IFT_STF; 239 sc->sc_if.if_dlt = DLT_NULL; 240 #if defined(__FreeBSD__) && __FreeBSD__ >= 4 241 sc->sc_if.if_snd.ifq_maxlen = IFQ_MAXLEN; 242 #endif 243 if_attach(&sc->sc_if); 244 if_alloc_sadl(&sc->sc_if); 245 #if NBPFILTER > 0 246 bpfattach(&sc->sc_if, DLT_NULL, sizeof(u_int)); 247 #endif 248 LIST_INSERT_HEAD(&stf_softc_list, sc, sc_list); 249 return (0); 250 } 251 252 void 253 stf_clone_destroy(ifp) 254 struct ifnet *ifp; 255 { 256 struct stf_softc *sc = (void *) ifp; 257 258 LIST_REMOVE(sc, sc_list); 259 encap_detach(sc->encap_cookie); 260 #if NBPFILTER > 0 261 bpfdetach(ifp); 262 #endif 263 if_detach(ifp); 264 free(sc, M_DEVBUF); 265 } 266 267 #ifdef __FreeBSD__ 268 PSEUDO_SET(stfattach, if_stf); 269 #endif 270 271 static int 272 stf_encapcheck(m, off, proto, arg) 273 const struct mbuf *m; 274 int off; 275 int proto; 276 void *arg; 277 { 278 struct ip ip; 279 struct in6_ifaddr *ia6; 280 struct stf_softc *sc; 281 struct in_addr a, b; 282 283 sc = (struct stf_softc *)arg; 284 if (sc == NULL) 285 return 0; 286 287 if ((sc->sc_if.if_flags & IFF_UP) == 0) 288 return 0; 289 290 /* IFF_LINK0 means "no decapsulation" */ 291 if ((sc->sc_if.if_flags & IFF_LINK0) != 0) 292 return 0; 293 294 if (proto != IPPROTO_IPV6) 295 return 0; 296 297 /* LINTED const cast */ 298 m_copydata((struct mbuf *)m, 0, sizeof(ip), (caddr_t)&ip); 299 300 if (ip.ip_v != 4) 301 return 0; 302 303 ia6 = stf_getsrcifa6(&sc->sc_if); 304 if (ia6 == NULL) 305 return 0; 306 307 /* 308 * check if IPv4 dst matches the IPv4 address derived from the 309 * local 6to4 address. 310 * success on: dst = 10.1.1.1, ia6->ia_addr = 2002:0a01:0101:... 311 */ 312 if (bcmp(GET_V4(&ia6->ia_addr.sin6_addr), &ip.ip_dst, 313 sizeof(ip.ip_dst)) != 0) 314 return 0; 315 316 /* 317 * check if IPv4 src matches the IPv4 address derived from the 318 * local 6to4 address masked by prefixmask. 319 * success on: src = 10.1.1.1, ia6->ia_addr = 2002:0a00:.../24 320 * fail on: src = 10.1.1.1, ia6->ia_addr = 2002:0b00:.../24 321 */ 322 memset(&a, 0, sizeof(a)); 323 a.s_addr = GET_V4(&ia6->ia_addr.sin6_addr)->s_addr; 324 a.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 325 b = ip.ip_src; 326 b.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 327 if (a.s_addr != b.s_addr) 328 return 0; 329 330 /* stf interface makes single side match only */ 331 return 32; 332 } 333 334 static struct in6_ifaddr * 335 stf_getsrcifa6(ifp) 336 struct ifnet *ifp; 337 { 338 struct ifaddr *ia; 339 struct in_ifaddr *ia4; 340 struct sockaddr_in6 *sin6; 341 struct in_addr in; 342 343 #if defined(__bsdi__) || (defined(__FreeBSD__) && __FreeBSD__ < 3) 344 for (ia = ifp->if_addrlist; ia; ia = ia->ifa_next) 345 #else 346 TAILQ_FOREACH(ia, &ifp->if_addrlist, ifa_list) 347 #endif 348 { 349 if (ia->ifa_addr == NULL) 350 continue; 351 if (ia->ifa_addr->sa_family != AF_INET6) 352 continue; 353 sin6 = (struct sockaddr_in6 *)ia->ifa_addr; 354 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) 355 continue; 356 357 bcopy(GET_V4(&sin6->sin6_addr), &in, sizeof(in)); 358 #ifdef __NetBSD__ 359 INADDR_TO_IA(in, ia4); 360 #else 361 #ifdef __OpenBSD__ 362 for (ia4 = TAILQ_FIRST(&in_ifaddr); 363 ia4; 364 ia4 = TAILQ_NEXT(ia4, ia_list)) 365 #elif defined(__FreeBSD__) && __FreeBSD__ >= 3 366 for (ia4 = TAILQ_FIRST(&in_ifaddrhead); 367 ia4; 368 ia4 = TAILQ_NEXT(ia4, ia_link)) 369 #else 370 for (ia4 = in_ifaddr; ia4 != NULL; ia4 = ia4->ia_next) 371 #endif 372 { 373 if (ia4->ia_addr.sin_addr.s_addr == in.s_addr) 374 break; 375 } 376 #endif 377 if (ia4 == NULL) 378 continue; 379 380 return (struct in6_ifaddr *)ia; 381 } 382 383 return NULL; 384 } 385 386 static int 387 stf_output(ifp, m, dst, rt) 388 struct ifnet *ifp; 389 struct mbuf *m; 390 struct sockaddr *dst; 391 struct rtentry *rt; 392 { 393 struct stf_softc *sc; 394 struct sockaddr_in6 *dst6; 395 struct in_addr *in4; 396 struct sockaddr_in *dst4; 397 u_int8_t tos; 398 struct ip *ip; 399 struct ip6_hdr *ip6; 400 struct in6_ifaddr *ia6; 401 402 sc = (struct stf_softc*)ifp; 403 dst6 = (struct sockaddr_in6 *)dst; 404 405 /* just in case */ 406 if ((ifp->if_flags & IFF_UP) == 0) { 407 m_freem(m); 408 return ENETDOWN; 409 } 410 411 /* 412 * If we don't have an ip4 address that match my inner ip6 address, 413 * we shouldn't generate output. Without this check, we'll end up 414 * using wrong IPv4 source. 415 */ 416 ia6 = stf_getsrcifa6(ifp); 417 if (ia6 == NULL) { 418 m_freem(m); 419 return ENETDOWN; 420 } 421 422 if (m->m_len < sizeof(*ip6)) { 423 m = m_pullup(m, sizeof(*ip6)); 424 if (!m) 425 return ENOBUFS; 426 } 427 ip6 = mtod(m, struct ip6_hdr *); 428 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 429 430 /* 431 * Pickup the right outer dst addr from the list of candidates. 432 * ip6_dst has priority as it may be able to give us shorter IPv4 hops. 433 */ 434 if (IN6_IS_ADDR_6TO4(&ip6->ip6_dst)) 435 in4 = GET_V4(&ip6->ip6_dst); 436 else if (IN6_IS_ADDR_6TO4(&dst6->sin6_addr)) 437 in4 = GET_V4(&dst6->sin6_addr); 438 else { 439 m_freem(m); 440 return ENETUNREACH; 441 } 442 443 #if NBPFILTER > 0 444 if (ifp->if_bpf) { 445 /* 446 * We need to prepend the address family as 447 * a four byte field. Cons up a dummy header 448 * to pacify bpf. This is safe because bpf 449 * will only read from the mbuf (i.e., it won't 450 * try to free it or keep a pointer a to it). 451 */ 452 struct mbuf m0; 453 u_int32_t af = AF_INET6; 454 455 m0.m_next = m; 456 m0.m_len = 4; 457 m0.m_data = (char *)⁡ 458 459 #ifdef HAVE_OLD_BPF 460 bpf_mtap(ifp, &m0); 461 #else 462 bpf_mtap(ifp->if_bpf, &m0); 463 #endif 464 } 465 #endif /*NBPFILTER > 0*/ 466 467 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 468 if (m && m->m_len < sizeof(struct ip)) 469 m = m_pullup(m, sizeof(struct ip)); 470 if (m == NULL) 471 return ENOBUFS; 472 ip = mtod(m, struct ip *); 473 474 memset(ip, 0, sizeof(*ip)); 475 476 bcopy(GET_V4(&((struct sockaddr_in6 *)&ia6->ia_addr)->sin6_addr), 477 &ip->ip_src, sizeof(ip->ip_src)); 478 bcopy(in4, &ip->ip_dst, sizeof(ip->ip_dst)); 479 ip->ip_p = IPPROTO_IPV6; 480 ip->ip_ttl = ip_gif_ttl; /*XXX*/ 481 ip->ip_len = m->m_pkthdr.len; /*host order*/ 482 if (ifp->if_flags & IFF_LINK1) 483 ip_ecn_ingress(ECN_ALLOWED, &ip->ip_tos, &tos); 484 else 485 ip_ecn_ingress(ECN_NOCARE, &ip->ip_tos, &tos); 486 487 dst4 = (struct sockaddr_in *)&sc->sc_ro.ro_dst; 488 if (dst4->sin_family != AF_INET || 489 bcmp(&dst4->sin_addr, &ip->ip_dst, sizeof(ip->ip_dst)) != 0) { 490 /* cache route doesn't match */ 491 dst4->sin_family = AF_INET; 492 dst4->sin_len = sizeof(struct sockaddr_in); 493 bcopy(&ip->ip_dst, &dst4->sin_addr, sizeof(dst4->sin_addr)); 494 if (sc->sc_ro.ro_rt) { 495 RTFREE(sc->sc_ro.ro_rt); 496 sc->sc_ro.ro_rt = NULL; 497 } 498 } 499 500 if (sc->sc_ro.ro_rt == NULL) { 501 rtalloc(&sc->sc_ro); 502 if (sc->sc_ro.ro_rt == NULL) { 503 m_freem(m); 504 return ENETUNREACH; 505 } 506 } 507 508 #ifndef __OpenBSD__ 509 return ip_output(m, NULL, &sc->sc_ro, 0, NULL); 510 #else 511 return ip_output(m, NULL, &sc->sc_ro, 0, NULL, NULL); 512 #endif 513 } 514 515 static int 516 stf_checkaddr4(sc, in, inifp) 517 struct stf_softc *sc; 518 struct in_addr *in; 519 struct ifnet *inifp; /* incoming interface */ 520 { 521 struct in_ifaddr *ia4; 522 523 /* 524 * reject packets with the following address: 525 * 224.0.0.0/4 0.0.0.0/8 127.0.0.0/8 255.0.0.0/8 526 */ 527 if (IN_MULTICAST(in->s_addr)) 528 return -1; 529 switch ((ntohl(in->s_addr) & 0xff000000) >> 24) { 530 case 0: case 127: case 255: 531 return -1; 532 } 533 534 /* 535 * reject packets with broadcast 536 */ 537 #if defined(__OpenBSD__) || defined(__NetBSD__) 538 TAILQ_FOREACH(ia4, &in_ifaddr, ia_list) 539 #elif defined(__FreeBSD__) && __FreeBSD__ >= 3 540 for (ia4 = TAILQ_FIRST(&in_ifaddrhead); 541 ia4; 542 ia4 = TAILQ_NEXT(ia4, ia_link)) 543 #else 544 for (ia4 = in_ifaddr; ia4 != NULL; ia4 = ia4->ia_next) 545 #endif 546 { 547 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0) 548 continue; 549 if (in->s_addr == ia4->ia_broadaddr.sin_addr.s_addr) 550 return -1; 551 } 552 553 /* 554 * perform ingress filter 555 */ 556 if (sc && (sc->sc_if.if_flags & IFF_LINK2) == 0 && inifp) { 557 struct sockaddr_in sin; 558 struct rtentry *rt; 559 560 memset(&sin, 0, sizeof(sin)); 561 sin.sin_family = AF_INET; 562 sin.sin_len = sizeof(struct sockaddr_in); 563 sin.sin_addr = *in; 564 #ifdef __FreeBSD__ 565 rt = rtalloc1((struct sockaddr *)&sin, 0, 0UL); 566 #else 567 rt = rtalloc1((struct sockaddr *)&sin, 0); 568 #endif 569 if (!rt || rt->rt_ifp != inifp) { 570 #if 0 571 log(LOG_WARNING, "%s: packet from 0x%x dropped " 572 "due to ingress filter\n", if_name(&sc->sc_if), 573 (u_int32_t)ntohl(sin.sin_addr.s_addr)); 574 #endif 575 if (rt) 576 rtfree(rt); 577 return -1; 578 } 579 rtfree(rt); 580 } 581 582 return 0; 583 } 584 585 static int 586 stf_checkaddr6(sc, in6, inifp) 587 struct stf_softc *sc; 588 struct in6_addr *in6; 589 struct ifnet *inifp; /* incoming interface */ 590 { 591 /* 592 * check 6to4 addresses 593 */ 594 if (IN6_IS_ADDR_6TO4(in6)) 595 return stf_checkaddr4(sc, GET_V4(in6), inifp); 596 597 /* 598 * reject anything that look suspicious. the test is implemented 599 * in ip6_input too, but we check here as well to 600 * (1) reject bad packets earlier, and 601 * (2) to be safe against future ip6_input change. 602 */ 603 if (IN6_IS_ADDR_V4COMPAT(in6) || IN6_IS_ADDR_V4MAPPED(in6)) 604 return -1; 605 606 return 0; 607 } 608 609 void 610 #if __STDC__ 611 in_stf_input(struct mbuf *m, ...) 612 #else 613 in_stf_input(m, va_alist) 614 struct mbuf *m; 615 #endif 616 { 617 int off, proto; 618 struct stf_softc *sc; 619 struct ip *ip; 620 struct ip6_hdr *ip6; 621 u_int8_t otos, itos; 622 int s, isr; 623 struct ifqueue *ifq = NULL; 624 struct ifnet *ifp; 625 va_list ap; 626 627 va_start(ap, m); 628 off = va_arg(ap, int); 629 proto = va_arg(ap, int); 630 va_end(ap); 631 632 if (proto != IPPROTO_IPV6) { 633 m_freem(m); 634 return; 635 } 636 637 ip = mtod(m, struct ip *); 638 639 sc = (struct stf_softc *)encap_getarg(m); 640 641 if (sc == NULL || (sc->sc_if.if_flags & IFF_UP) == 0) { 642 m_freem(m); 643 return; 644 } 645 646 ifp = &sc->sc_if; 647 648 /* 649 * perform sanity check against outer src/dst. 650 * for source, perform ingress filter as well. 651 */ 652 if (stf_checkaddr4(sc, &ip->ip_dst, NULL) < 0 || 653 stf_checkaddr4(sc, &ip->ip_src, m->m_pkthdr.rcvif) < 0) { 654 m_freem(m); 655 return; 656 } 657 658 otos = ip->ip_tos; 659 m_adj(m, off); 660 661 if (m->m_len < sizeof(*ip6)) { 662 m = m_pullup(m, sizeof(*ip6)); 663 if (!m) 664 return; 665 } 666 ip6 = mtod(m, struct ip6_hdr *); 667 668 /* 669 * perform sanity check against inner src/dst. 670 * for source, perform ingress filter as well. 671 */ 672 if (stf_checkaddr6(sc, &ip6->ip6_dst, NULL) < 0 || 673 stf_checkaddr6(sc, &ip6->ip6_src, m->m_pkthdr.rcvif) < 0) { 674 m_freem(m); 675 return; 676 } 677 678 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 679 if ((ifp->if_flags & IFF_LINK1) != 0) 680 ip_ecn_egress(ECN_ALLOWED, &otos, &itos); 681 else 682 ip_ecn_egress(ECN_NOCARE, &otos, &itos); 683 ip6->ip6_flow &= ~htonl(0xff << 20); 684 ip6->ip6_flow |= htonl((u_int32_t)itos << 20); 685 686 m->m_pkthdr.rcvif = ifp; 687 688 #if NBPFILTER > 0 689 if (ifp->if_bpf) { 690 /* 691 * We need to prepend the address family as 692 * a four byte field. Cons up a dummy header 693 * to pacify bpf. This is safe because bpf 694 * will only read from the mbuf (i.e., it won't 695 * try to free it or keep a pointer a to it). 696 */ 697 struct mbuf m0; 698 u_int32_t af = AF_INET6; 699 700 m0.m_next = m; 701 m0.m_len = 4; 702 m0.m_data = (char *)⁡ 703 704 #ifdef HAVE_OLD_BPF 705 bpf_mtap(ifp, &m0); 706 #else 707 bpf_mtap(ifp->if_bpf, &m0); 708 #endif 709 } 710 #endif /*NBPFILTER > 0*/ 711 712 /* 713 * Put the packet to the network layer input queue according to the 714 * specified address family. 715 * See net/if_gif.c for possible issues with packet processing 716 * reorder due to extra queueing. 717 */ 718 ifq = &ip6intrq; 719 isr = NETISR_IPV6; 720 721 s = splnet(); 722 if (IF_QFULL(ifq)) { 723 IF_DROP(ifq); /* update statistics */ 724 m_freem(m); 725 splx(s); 726 return; 727 } 728 IF_ENQUEUE(ifq, m); 729 schednetisr(isr); 730 ifp->if_ipackets++; 731 ifp->if_ibytes += m->m_pkthdr.len; 732 splx(s); 733 } 734 735 /* ARGSUSED */ 736 static void 737 stf_rtrequest(cmd, rt, info) 738 int cmd; 739 struct rtentry *rt; 740 struct rt_addrinfo *info; 741 { 742 743 if (rt) 744 rt->rt_rmx.rmx_mtu = IPV6_MMTU; 745 } 746 747 static int 748 stf_ioctl(ifp, cmd, data) 749 struct ifnet *ifp; 750 #if defined(__FreeBSD__) && __FreeBSD__ < 3 751 int cmd; 752 #else 753 u_long cmd; 754 #endif 755 caddr_t data; 756 { 757 struct ifaddr *ifa; 758 struct ifreq *ifr; 759 struct sockaddr_in6 *sin6; 760 int error; 761 762 error = 0; 763 switch (cmd) { 764 case SIOCSIFADDR: 765 ifa = (struct ifaddr *)data; 766 if (ifa == NULL || ifa->ifa_addr->sa_family != AF_INET6) { 767 error = EAFNOSUPPORT; 768 break; 769 } 770 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 771 if (IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) { 772 ifa->ifa_rtrequest = stf_rtrequest; 773 ifp->if_flags |= IFF_UP; 774 } else 775 error = EINVAL; 776 break; 777 778 case SIOCADDMULTI: 779 case SIOCDELMULTI: 780 ifr = (struct ifreq *)data; 781 if (ifr && ifr->ifr_addr.sa_family == AF_INET6) 782 ; 783 else 784 error = EAFNOSUPPORT; 785 break; 786 787 default: 788 error = EINVAL; 789 break; 790 } 791 792 return error; 793 } 794 795 #endif /* NSTF > 0 */ 796
Indexes created Tue Sep 30 07:10:03 GMT 2025