Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/bsd/net/if_stf.c
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1 /* $FreeBSD: src/sys/net/if_stf.c,v 1.1.2.6 2001/07/24 19:10:18 brooks 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/param.h> 78 #include <sys/systm.h> 79 #include <sys/socket.h> 80 #include <sys/sockio.h> 81 #include <sys/mbuf.h> 82 #include <sys/errno.h> 83 #include <sys/protosw.h> 84 #include <sys/kernel.h> 85 #include <sys/syslog.h> 86 #include <machine/cpu.h> 87 88 #include <sys/malloc.h> 89 90 #include <net/if.h> 91 #include <net/route.h> 92 #include <net/netisr.h> 93 #include <net/if_types.h> 94 #include <net/if_stf.h> 95 96 #include <netinet/in.h> 97 #include <netinet/in_systm.h> 98 #include <netinet/ip.h> 99 #include <netinet/ip_var.h> 100 #include <netinet/in_var.h> 101 102 #include <netinet/ip6.h> 103 #include <netinet6/ip6_var.h> 104 #include <netinet6/in6_var.h> 105 #include <netinet/ip_ecn.h> 106 107 #include <netinet/ip_encap.h> 108 #include <net/dlil.h> 109 110 111 #include <net/net_osdep.h> 112 113 #include <net/bpf.h> 114 115 #define IN6_IS_ADDR_6TO4(x) (ntohs((x)->s6_addr16[0]) == 0x2002) 116 #define GET_V4(x) ((struct in_addr *)(&(x)->s6_addr16[1])) 117 118 struct stf_softc { 119 struct ifnet sc_if; /* common area */ 120 #ifdef __APPLE__ 121 struct if_proto *stf_proto; /* dlil protocol attached */ 122 #endif 123 union { 124 struct route __sc_ro4; 125 struct route_in6 __sc_ro6; /* just for safety */ 126 } __sc_ro46; 127 #define sc_ro __sc_ro46.__sc_ro4 128 const struct encaptab *encap_cookie; 129 }; 130 131 static struct stf_softc *stf; 132 133 #ifdef __APPLE__ 134 void stfattach __P((void)); 135 int stf_pre_output __P((struct ifnet *, register struct mbuf **, struct sockaddr *, 136 caddr_t, char *, char *, u_long)); 137 static u_long stf_dl_tag=0; 138 #endif 139 140 #ifndef __APPLE__ 141 static MALLOC_DEFINE(M_STF, "stf", "6to4 Tunnel Interface"); 142 #endif 143 static int ip_stf_ttl = 40; 144 145 extern struct domain inetdomain; 146 struct protosw in_stf_protosw = 147 { SOCK_RAW, &inetdomain, IPPROTO_IPV6, PR_ATOMIC|PR_ADDR, 148 in_stf_input, 0, 0, rip_ctloutput, 149 0, 150 0, 0, 0, 0, 151 0, 152 &rip_usrreqs 153 }; 154 155 static int stf_encapcheck __P((const struct mbuf *, int, int, void *)); 156 static struct in6_ifaddr *stf_getsrcifa6 __P((struct ifnet *)); 157 int stf_pre_output __P((struct ifnet *, register struct mbuf **, struct sockaddr *, 158 caddr_t, char *, char *, u_long)); 159 static int stf_checkaddr4 __P((struct stf_softc *, struct in_addr *, 160 struct ifnet *)); 161 static int stf_checkaddr6 __P((struct stf_softc *, struct in6_addr *, 162 struct ifnet *)); 163 static void stf_rtrequest __P((int, struct rtentry *, struct sockaddr *)); 164 int stf_ioctl __P((struct ifnet *, u_long, void *)); 165 166 167 static 168 int stf_add_if(struct ifnet *ifp) 169 { 170 ifp->if_demux = 0; 171 ifp->if_framer = 0; 172 return 0; 173 } 174 175 static 176 int stf_del_if(struct ifnet *ifp) 177 { 178 return 0; 179 } 180 181 static 182 int stf_add_proto(struct ddesc_head_str *desc_head, struct if_proto *proto, u_long dl_tag) 183 { 184 /* Only one protocol may be attached at a time */ 185 struct stf_softc* stf = (struct stf_softc*)proto->ifp; 186 if (stf->stf_proto == NULL) 187 stf->stf_proto = proto; 188 else { 189 printf("stf_add_proto: stf already has a proto\n"); 190 return (EBUSY); 191 } 192 193 return (0); 194 } 195 196 static 197 int stf_del_proto(struct if_proto *proto, u_long dl_tag) 198 { 199 if (((struct stf_softc*)proto->ifp)->stf_proto == proto) 200 ((struct stf_softc*)proto->ifp)->stf_proto = NULL; 201 else 202 return ENOENT; 203 204 return 0; 205 } 206 207 int stf_shutdown() 208 { 209 return 0; 210 } 211 212 int stf_attach_inet6(struct ifnet *ifp, u_long *dl_tag) 213 { 214 struct dlil_proto_reg_str reg; 215 struct dlil_demux_desc desc; 216 short native=0; 217 int stat, i; 218 219 if (stf_dl_tag != 0) { 220 *dl_tag = stf_dl_tag; 221 return 0; 222 } 223 224 TAILQ_INIT(®.demux_desc_head); 225 desc.type = DLIL_DESC_RAW; 226 desc.variants.bitmask.proto_id_length = 0; 227 desc.variants.bitmask.proto_id = 0; 228 desc.variants.bitmask.proto_id_mask = 0; 229 desc.native_type = (char *) &native; 230 TAILQ_INSERT_TAIL(®.demux_desc_head, &desc, next); 231 reg.interface_family = ifp->if_family; 232 reg.unit_number = ifp->if_unit; 233 reg.input = 0; 234 reg.pre_output = stf_pre_output; 235 reg.event = 0; 236 reg.offer = 0; 237 reg.ioctl = 0; 238 reg.default_proto = 0; 239 reg.protocol_family = PF_INET6; 240 241 stat = dlil_attach_protocol(®, &stf_dl_tag); 242 *dl_tag = stf_dl_tag; 243 244 return stat; 245 } 246 247 int stf_detach_inet6(struct ifnet *ifp, u_long dl_tag) 248 { 249 int stat; 250 251 stat = dlil_find_dltag(ifp->if_family, ifp->if_unit, AF_INET6, &dl_tag); 252 if (stat == 0) { 253 stat = dlil_detach_protocol(dl_tag); 254 if (stat) { 255 printf("WARNING: stf_detach can't detach IP AF_INET6 from interface\n"); 256 } 257 } 258 return (stat); 259 } 260 261 void stf_reg_if_mods() 262 { 263 struct dlil_ifmod_reg_str stf_ifmod; 264 struct dlil_protomod_reg_str stf_protoreg; 265 int error; 266 267 bzero(&stf_ifmod, sizeof(stf_ifmod)); 268 stf_ifmod.add_if = stf_add_if; 269 stf_ifmod.del_if = stf_del_if; 270 stf_ifmod.add_proto = stf_add_proto; 271 stf_ifmod.del_proto = stf_del_proto; 272 stf_ifmod.ifmod_ioctl = 0; 273 stf_ifmod.shutdown = stf_shutdown; 274 275 276 if (dlil_reg_if_modules(APPLE_IF_FAM_STF, &stf_ifmod)) 277 panic("Couldn't register stf modules\n"); 278 279 /* Register protocol registration functions */ 280 281 bzero(&stf_protoreg, sizeof(stf_protoreg)); 282 stf_protoreg.attach_proto = stf_attach_inet6; 283 stf_protoreg.detach_proto = stf_detach_inet6; 284 285 if ( error = dlil_reg_proto_module(AF_INET6, APPLE_IF_FAM_STF, &stf_protoreg) != 0) 286 kprintf("dlil_reg_proto_module failed for AF_INET6 error=%d\n", error); 287 } 288 289 void 290 stfattach(void) 291 { 292 struct ifnet *ifp; 293 struct stf_softc *sc; 294 int i, error; 295 296 297 int err; 298 const struct encaptab *p; 299 300 stf_reg_if_mods(); /* DLIL modules */ 301 302 sc = _MALLOC(sizeof(struct stf_softc), M_DEVBUF, M_WAITOK); 303 if (sc == 0) { 304 printf("stf softc attach failed\n" ); 305 return; 306 } 307 308 bzero(sc, sizeof(*sc)); 309 sc->sc_if.if_name = "stf"; 310 sc->sc_if.if_unit = 0; 311 312 p = encap_attach_func(AF_INET, IPPROTO_IPV6, stf_encapcheck, 313 &in_stf_protosw, sc); 314 if (p == NULL) { 315 printf("%s: attach failed\n", if_name(&sc->sc_if)); 316 FREE(sc, M_DEVBUF); 317 return; 318 } 319 sc->encap_cookie = p; 320 sc->sc_if.if_mtu = IPV6_MMTU; 321 sc->sc_if.if_flags = 0; 322 sc->sc_if.if_ioctl = stf_ioctl; 323 sc->sc_if.if_output = NULL; /* processing done in pre_output */ 324 sc->sc_if.if_type = IFT_STF; 325 sc->sc_if.if_family= APPLE_IF_FAM_STF; 326 #if 0 327 /* turn off ingress filter */ 328 sc->sc_if.if_flags |= IFF_LINK2; 329 #endif 330 sc->sc_if.if_snd.ifq_maxlen = IFQ_MAXLEN; 331 332 if (error = dlil_if_attach(&sc->sc_if)) 333 printf("stfattach: can't dlil_if_attach error=%d\n"); 334 else 335 bpfattach(&sc->sc_if, DLT_NULL, sizeof(u_int)); 336 337 return ; 338 } 339 340 static int 341 stf_encapcheck(m, off, proto, arg) 342 const struct mbuf *m; 343 int off; 344 int proto; 345 void *arg; 346 { 347 struct ip ip; 348 struct in6_ifaddr *ia6; 349 struct stf_softc *sc; 350 struct in_addr a, b; 351 352 sc = (struct stf_softc *)arg; 353 if (sc == NULL) 354 return 0; 355 356 if ((sc->sc_if.if_flags & IFF_UP) == 0) 357 return 0; 358 359 /* IFF_LINK0 means "no decapsulation" */ 360 if ((sc->sc_if.if_flags & IFF_LINK0) != 0) 361 return 0; 362 363 if (proto != IPPROTO_IPV6) 364 return 0; 365 366 /* LINTED const cast */ 367 m_copydata((struct mbuf *)m, 0, sizeof(ip), (caddr_t)&ip); 368 369 if (ip.ip_v != 4) 370 return 0; 371 372 ia6 = stf_getsrcifa6(&sc->sc_if); 373 if (ia6 == NULL) 374 return 0; 375 376 /* 377 * check if IPv4 dst matches the IPv4 address derived from the 378 * local 6to4 address. 379 * success on: dst = 10.1.1.1, ia6->ia_addr = 2002:0a01:0101:... 380 */ 381 if (bcmp(GET_V4(&ia6->ia_addr.sin6_addr), &ip.ip_dst, 382 sizeof(ip.ip_dst)) != 0) 383 return 0; 384 385 /* 386 * check if IPv4 src matches the IPv4 address derived from the 387 * local 6to4 address masked by prefixmask. 388 * success on: src = 10.1.1.1, ia6->ia_addr = 2002:0a00:.../24 389 * fail on: src = 10.1.1.1, ia6->ia_addr = 2002:0b00:.../24 390 */ 391 bzero(&a, sizeof(a)); 392 a.s_addr = GET_V4(&ia6->ia_addr.sin6_addr)->s_addr; 393 a.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 394 b = ip.ip_src; 395 b.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 396 if (a.s_addr != b.s_addr) 397 return 0; 398 399 /* stf interface makes single side match only */ 400 return 32; 401 } 402 403 static struct in6_ifaddr * 404 stf_getsrcifa6(ifp) 405 struct ifnet *ifp; 406 { 407 struct ifaddr *ia; 408 struct in_ifaddr *ia4; 409 struct sockaddr_in6 *sin6; 410 struct in_addr in; 411 412 for (ia = ifp->if_addrlist.tqh_first; 413 ia; 414 ia = ia->ifa_list.tqe_next) 415 { 416 if (ia->ifa_addr == NULL) 417 continue; 418 if (ia->ifa_addr->sa_family != AF_INET6) 419 continue; 420 sin6 = (struct sockaddr_in6 *)ia->ifa_addr; 421 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) 422 continue; 423 424 bcopy(GET_V4(&sin6->sin6_addr), &in, sizeof(in)); 425 for (ia4 = TAILQ_FIRST(&in_ifaddrhead); 426 ia4; 427 ia4 = TAILQ_NEXT(ia4, ia_link)) 428 { 429 if (ia4->ia_addr.sin_addr.s_addr == in.s_addr) 430 break; 431 } 432 if (ia4 == NULL) 433 continue; 434 435 return (struct in6_ifaddr *)ia; 436 } 437 438 return NULL; 439 } 440 441 int 442 stf_pre_output(ifp, m0, dst, rt, frame_type, address, dl_tag) 443 struct ifnet *ifp; 444 register struct mbuf **m0; 445 struct sockaddr *dst; 446 caddr_t rt; 447 char *frame_type; 448 char *address; 449 u_long dl_tag; 450 { 451 register struct mbuf *m = *m0; 452 struct stf_softc *sc; 453 struct sockaddr_in6 *dst6; 454 struct in_addr *in4; 455 struct sockaddr_in *dst4; 456 u_int8_t tos; 457 struct ip *ip; 458 struct ip6_hdr *ip6; 459 struct in6_ifaddr *ia6; 460 int error = 0 ; 461 462 sc = (struct stf_softc*)ifp; 463 dst6 = (struct sockaddr_in6 *)dst; 464 465 /* just in case */ 466 if ((ifp->if_flags & IFF_UP) == 0) { 467 printf("stf: IFF_DOWN\n"); 468 return ENETDOWN; 469 } 470 471 /* 472 * If we don't have an ip4 address that match my inner ip6 address, 473 * we shouldn't generate output. Without this check, we'll end up 474 * using wrong IPv4 source. 475 */ 476 ia6 = stf_getsrcifa6(ifp); 477 if (ia6 == NULL) { 478 return ENETDOWN; 479 } 480 481 if (m->m_len < sizeof(*ip6)) { 482 m = m_pullup(m, sizeof(*ip6)); 483 if (!m) 484 return ENOBUFS; 485 } 486 ip6 = mtod(m, struct ip6_hdr *); 487 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 488 489 /* 490 * Pickup the right outer dst addr from the list of candidates. 491 * ip6_dst has priority as it may be able to give us shorter IPv4 hops. 492 */ 493 if (IN6_IS_ADDR_6TO4(&ip6->ip6_dst)) 494 in4 = GET_V4(&ip6->ip6_dst); 495 else if (IN6_IS_ADDR_6TO4(&dst6->sin6_addr)) 496 in4 = GET_V4(&dst6->sin6_addr); 497 else { 498 return ENETUNREACH; 499 } 500 501 if (ifp->if_bpf) { 502 /* 503 * We need to prepend the address family as 504 * a four byte field. Cons up a dummy header 505 * to pacify bpf. This is safe because bpf 506 * will only read from the mbuf (i.e., it won't 507 * try to free it or keep a pointer a to it). 508 */ 509 struct mbuf m0; 510 u_int32_t af = AF_INET6; 511 512 m0.m_next = m; 513 m0.m_len = 4; 514 m0.m_data = (char *)⁡ 515 516 bpf_mtap(ifp, &m0); 517 } 518 519 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 520 if (m && m->m_len < sizeof(struct ip)) 521 m = m_pullup(m, sizeof(struct ip)); 522 if (m == NULL) 523 return ENOBUFS; 524 ip = mtod(m, struct ip *); 525 526 bzero(ip, sizeof(*ip)); 527 528 bcopy(GET_V4(&((struct sockaddr_in6 *)&ia6->ia_addr)->sin6_addr), 529 &ip->ip_src, sizeof(ip->ip_src)); 530 bcopy(in4, &ip->ip_dst, sizeof(ip->ip_dst)); 531 ip->ip_p = IPPROTO_IPV6; 532 ip->ip_ttl = ip_stf_ttl; 533 ip->ip_len = m->m_pkthdr.len; /*host order*/ 534 if (ifp->if_flags & IFF_LINK1) 535 ip_ecn_ingress(ECN_ALLOWED, &ip->ip_tos, &tos); 536 else 537 ip_ecn_ingress(ECN_NOCARE, &ip->ip_tos, &tos); 538 539 dst4 = (struct sockaddr_in *)&sc->sc_ro.ro_dst; 540 if (dst4->sin_family != AF_INET || 541 bcmp(&dst4->sin_addr, &ip->ip_dst, sizeof(ip->ip_dst)) != 0) { 542 /* cache route doesn't match */ 543 dst4->sin_family = AF_INET; 544 dst4->sin_len = sizeof(struct sockaddr_in); 545 bcopy(&ip->ip_dst, &dst4->sin_addr, sizeof(dst4->sin_addr)); 546 if (sc->sc_ro.ro_rt) { 547 RTFREE(sc->sc_ro.ro_rt); 548 sc->sc_ro.ro_rt = NULL; 549 } 550 } 551 552 if (sc->sc_ro.ro_rt == NULL) { 553 rtalloc(&sc->sc_ro); 554 if (sc->sc_ro.ro_rt == NULL) { 555 return ENETUNREACH; 556 } 557 } 558 559 error = ip_output(m, NULL, &sc->sc_ro, 0, NULL); 560 if (error == 0) 561 return EJUSTRETURN; 562 } 563 564 static int 565 stf_checkaddr4(sc, in, inifp) 566 struct stf_softc *sc; 567 struct in_addr *in; 568 struct ifnet *inifp; /* incoming interface */ 569 { 570 struct in_ifaddr *ia4; 571 572 /* 573 * reject packets with the following address: 574 * 224.0.0.0/4 0.0.0.0/8 127.0.0.0/8 255.0.0.0/8 575 */ 576 if (IN_MULTICAST(ntohl(in->s_addr))) 577 return -1; 578 switch ((ntohl(in->s_addr) & 0xff000000) >> 24) { 579 case 0: case 127: case 255: 580 return -1; 581 } 582 583 /* 584 * reject packets with broadcast 585 */ 586 for (ia4 = TAILQ_FIRST(&in_ifaddrhead); 587 ia4; 588 ia4 = TAILQ_NEXT(ia4, ia_link)) 589 { 590 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0) 591 continue; 592 if (in->s_addr == ia4->ia_broadaddr.sin_addr.s_addr) 593 return -1; 594 } 595 596 /* 597 * perform ingress filter 598 */ 599 if (sc && (sc->sc_if.if_flags & IFF_LINK2) == 0 && inifp) { 600 struct sockaddr_in sin; 601 struct rtentry *rt; 602 603 bzero(&sin, sizeof(sin)); 604 sin.sin_family = AF_INET; 605 sin.sin_len = sizeof(struct sockaddr_in); 606 sin.sin_addr = *in; 607 rt = rtalloc1((struct sockaddr *)&sin, 0, 0UL); 608 if (!rt || rt->rt_ifp != inifp) { 609 #if 1 610 log(LOG_WARNING, "%s: packet from 0x%x dropped " 611 "due to ingress filter\n", if_name(&sc->sc_if), 612 (u_int32_t)ntohl(sin.sin_addr.s_addr)); 613 #endif 614 if (rt) 615 rtfree(rt); 616 return -1; 617 } 618 rtfree(rt); 619 } 620 621 return 0; 622 } 623 624 static int 625 stf_checkaddr6(sc, in6, inifp) 626 struct stf_softc *sc; 627 struct in6_addr *in6; 628 struct ifnet *inifp; /* incoming interface */ 629 { 630 /* 631 * check 6to4 addresses 632 */ 633 if (IN6_IS_ADDR_6TO4(in6)) 634 return stf_checkaddr4(sc, GET_V4(in6), inifp); 635 636 /* 637 * reject anything that look suspicious. the test is implemented 638 * in ip6_input too, but we check here as well to 639 * (1) reject bad packets earlier, and 640 * (2) to be safe against future ip6_input change. 641 */ 642 if (IN6_IS_ADDR_V4COMPAT(in6) || IN6_IS_ADDR_V4MAPPED(in6)) 643 return -1; 644 645 return 0; 646 } 647 648 void 649 in_stf_input(m, off) 650 struct mbuf *m; 651 int off; 652 { 653 struct stf_softc *sc; 654 struct ip *ip; 655 struct ip6_hdr *ip6; 656 u_int8_t otos, itos; 657 int s, isr, proto; 658 struct ifqueue *ifq = NULL; 659 struct ifnet *ifp; 660 661 ip = mtod(m, struct ip *); 662 proto = ip->ip_p; 663 664 665 if (proto != IPPROTO_IPV6) { 666 m_freem(m); 667 return; 668 } 669 670 ip = mtod(m, struct ip *); 671 672 sc = (struct stf_softc *)encap_getarg(m); 673 674 if (sc == NULL || (sc->sc_if.if_flags & IFF_UP) == 0) { 675 m_freem(m); 676 return; 677 } 678 679 ifp = &sc->sc_if; 680 681 /* 682 * perform sanity check against outer src/dst. 683 * for source, perform ingress filter as well. 684 */ 685 if (stf_checkaddr4(sc, &ip->ip_dst, NULL) < 0 || 686 stf_checkaddr4(sc, &ip->ip_src, m->m_pkthdr.rcvif) < 0) { 687 m_freem(m); 688 return; 689 } 690 691 otos = ip->ip_tos; 692 m_adj(m, off); 693 694 if (m->m_len < sizeof(*ip6)) { 695 m = m_pullup(m, sizeof(*ip6)); 696 if (!m) 697 return; 698 } 699 ip6 = mtod(m, struct ip6_hdr *); 700 701 /* 702 * perform sanity check against inner src/dst. 703 * for source, perform ingress filter as well. 704 */ 705 if (stf_checkaddr6(sc, &ip6->ip6_dst, NULL) < 0 || 706 stf_checkaddr6(sc, &ip6->ip6_src, m->m_pkthdr.rcvif) < 0) { 707 m_freem(m); 708 return; 709 } 710 711 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 712 if ((ifp->if_flags & IFF_LINK1) != 0) 713 ip_ecn_egress(ECN_ALLOWED, &otos, &itos); 714 else 715 ip_ecn_egress(ECN_NOCARE, &otos, &itos); 716 ip6->ip6_flow &= ~htonl(0xff << 20); 717 ip6->ip6_flow |= htonl((u_int32_t)itos << 20); 718 719 m->m_pkthdr.rcvif = ifp; 720 721 if (ifp->if_bpf) { 722 /* 723 * We need to prepend the address family as 724 * a four byte field. Cons up a dummy header 725 * to pacify bpf. This is safe because bpf 726 * will only read from the mbuf (i.e., it won't 727 * try to free it or keep a pointer a to it). 728 */ 729 struct mbuf m0; 730 u_int32_t af = AF_INET6; 731 732 m0.m_next = m; 733 m0.m_len = 4; 734 m0.m_data = (char *)⁡ 735 736 #ifdef HAVE_OLD_BPF 737 bpf_mtap(ifp, &m0); 738 #else 739 bpf_mtap(ifp->if_bpf, &m0); 740 #endif 741 } 742 743 /* 744 * Put the packet to the network layer input queue according to the 745 * specified address family. 746 * See net/if_gif.c for possible issues with packet processing 747 * reorder due to extra queueing. 748 */ 749 ifq = &ip6intrq; 750 isr = NETISR_IPV6; 751 752 s = splimp(); 753 if (IF_QFULL(ifq)) { 754 IF_DROP(ifq); /* update statistics */ 755 m_freem(m); 756 splx(s); 757 return; 758 } 759 IF_ENQUEUE(ifq, m); 760 schednetisr(isr); 761 ifp->if_ipackets++; 762 ifp->if_ibytes += m->m_pkthdr.len; 763 splx(s); 764 765 return; 766 } 767 768 /* ARGSUSED */ 769 static void 770 stf_rtrequest(cmd, rt, sa) 771 int cmd; 772 struct rtentry *rt; 773 struct sockaddr *sa; 774 { 775 776 if (rt) 777 rt->rt_rmx.rmx_mtu = IPV6_MMTU; 778 } 779 780 int 781 stf_ioctl(ifp, cmd, data) 782 struct ifnet *ifp; 783 u_long cmd; 784 void *data; 785 { 786 struct ifaddr *ifa; 787 struct ifreq *ifr; 788 struct sockaddr_in6 *sin6; 789 int error; 790 791 error = 0; 792 switch (cmd) { 793 case SIOCSIFADDR: 794 ifa = (struct ifaddr *)data; 795 if (ifa == NULL || ifa->ifa_addr->sa_family != AF_INET6) { 796 error = EAFNOSUPPORT; 797 break; 798 } 799 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 800 if (IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) { 801 ifa->ifa_rtrequest = stf_rtrequest; 802 ifp->if_flags |= IFF_UP; 803 } else 804 error = EINVAL; 805 break; 806 807 case SIOCADDMULTI: 808 case SIOCDELMULTI: 809 ifr = (struct ifreq *)data; 810 if (ifr && ifr->ifr_addr.sa_family == AF_INET6) 811 ; 812 else 813 error = EAFNOSUPPORT; 814 break; 815 816 default: 817 error = EINVAL; 818 break; 819 } 820 821 return error; 822 }
Cache object: ed1cc8ff88c19df8676ee6813f62ce6d
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