if_stf.c revision 1.27
1 /* $NetBSD: if_stf.c,v 1.27 2002/08/05 23:37:48 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 #include <sys/cdefs.h> 78 __KERNEL_RCSID(0, "$NetBSD: if_stf.c,v 1.27 2002/08/05 23:37:48 itojun 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 #define STF_MTU (1500 - 20) 134 135 struct stf_softc { 136 struct ifnet sc_if; /* common area */ 137 union { 138 struct route __sc_ro4; 139 struct route_in6 __sc_ro6; /* just for safety */ 140 } __sc_ro46; 141 #define sc_ro __sc_ro46.__sc_ro4 142 const struct encaptab *encap_cookie; 143 LIST_ENTRY(stf_softc) sc_list; 144 }; 145 146 LIST_HEAD(, stf_softc) stf_softc_list; 147 148 int stf_clone_create __P((struct if_clone *, int)); 149 void stf_clone_destroy __P((struct ifnet *)); 150 151 struct if_clone stf_cloner = 152 IF_CLONE_INITIALIZER("stf", stf_clone_create, stf_clone_destroy); 153 154 #if NGIF > 0 155 extern int ip_gif_ttl; /*XXX*/ 156 #else 157 static int ip_gif_ttl = 40; /*XXX*/ 158 #endif 159 160 extern struct domain inetdomain; 161 struct protosw in_stf_protosw = 162 { SOCK_RAW, &inetdomain, IPPROTO_IPV6, PR_ATOMIC|PR_ADDR, 163 in_stf_input, rip_output, 0, rip_ctloutput, 164 rip_usrreq, 165 0, 0, 0, 0 166 }; 167 168 void stfattach __P((int)); 169 static int stf_encapcheck __P((const struct mbuf *, int, int, void *)); 170 static struct in6_ifaddr *stf_getsrcifa6 __P((struct ifnet *)); 171 static int stf_output __P((struct ifnet *, struct mbuf *, struct sockaddr *, 172 struct rtentry *)); 173 static int stf_checkaddr4 __P((struct stf_softc *, struct in_addr *, 174 struct ifnet *)); 175 static int stf_checkaddr6 __P((struct stf_softc *, struct in6_addr *, 176 struct ifnet *)); 177 static void stf_rtrequest __P((int, struct rtentry *, struct rt_addrinfo *)); 178 static int stf_ioctl __P((struct ifnet *, u_long, caddr_t)); 179 180 /* ARGSUSED */ 181 void 182 stfattach(count) 183 int count; 184 { 185 186 LIST_INIT(&stf_softc_list); 187 if_clone_attach(&stf_cloner); 188 } 189 190 int 191 stf_clone_create(ifc, unit) 192 struct if_clone *ifc; 193 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 sprintf(sc->sc_if.if_xname, "%s%d", 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 = STF_MTU; 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 void 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 } 244 245 static int 246 stf_encapcheck(m, off, proto, arg) 247 const struct mbuf *m; 248 int off; 249 int proto; 250 void *arg; 251 { 252 struct ip ip; 253 struct in6_ifaddr *ia6; 254 struct stf_softc *sc; 255 struct in_addr a, b; 256 257 sc = (struct stf_softc *)arg; 258 if (sc == NULL) 259 return 0; 260 261 if ((sc->sc_if.if_flags & IFF_UP) == 0) 262 return 0; 263 264 /* IFF_LINK0 means "no decapsulation" */ 265 if ((sc->sc_if.if_flags & IFF_LINK0) != 0) 266 return 0; 267 268 if (proto != IPPROTO_IPV6) 269 return 0; 270 271 /* LINTED const cast */ 272 m_copydata((struct mbuf *)m, 0, sizeof(ip), (caddr_t)&ip); 273 274 if (ip.ip_v != 4) 275 return 0; 276 277 ia6 = stf_getsrcifa6(&sc->sc_if); 278 if (ia6 == NULL) 279 return 0; 280 281 /* 282 * check if IPv4 dst matches the IPv4 address derived from the 283 * local 6to4 address. 284 * success on: dst = 10.1.1.1, ia6->ia_addr = 2002:0a01:0101:... 285 */ 286 if (bcmp(GET_V4(&ia6->ia_addr.sin6_addr), &ip.ip_dst, 287 sizeof(ip.ip_dst)) != 0) 288 return 0; 289 290 /* 291 * check if IPv4 src matches the IPv4 address derived from the 292 * local 6to4 address masked by prefixmask. 293 * success on: src = 10.1.1.1, ia6->ia_addr = 2002:0a00:.../24 294 * fail on: src = 10.1.1.1, ia6->ia_addr = 2002:0b00:.../24 295 */ 296 memset(&a, 0, sizeof(a)); 297 a.s_addr = GET_V4(&ia6->ia_addr.sin6_addr)->s_addr; 298 a.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 299 b = ip.ip_src; 300 b.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 301 if (a.s_addr != b.s_addr) 302 return 0; 303 304 /* stf interface makes single side match only */ 305 return 32; 306 } 307 308 static struct in6_ifaddr * 309 stf_getsrcifa6(ifp) 310 struct ifnet *ifp; 311 { 312 struct ifaddr *ia; 313 struct in_ifaddr *ia4; 314 struct sockaddr_in6 *sin6; 315 struct in_addr in; 316 317 TAILQ_FOREACH(ia, &ifp->if_addrlist, ifa_list) 318 { 319 if (ia->ifa_addr == NULL) 320 continue; 321 if (ia->ifa_addr->sa_family != AF_INET6) 322 continue; 323 sin6 = (struct sockaddr_in6 *)ia->ifa_addr; 324 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) 325 continue; 326 327 bcopy(GET_V4(&sin6->sin6_addr), &in, sizeof(in)); 328 INADDR_TO_IA(in, ia4); 329 if (ia4 == NULL) 330 continue; 331 332 return (struct in6_ifaddr *)ia; 333 } 334 335 return NULL; 336 } 337 338 static int 339 stf_output(ifp, m, dst, rt) 340 struct ifnet *ifp; 341 struct mbuf *m; 342 struct sockaddr *dst; 343 struct rtentry *rt; 344 { 345 struct stf_softc *sc; 346 struct sockaddr_in6 *dst6; 347 struct in_addr *in4; 348 struct sockaddr_in *dst4; 349 u_int8_t tos; 350 struct ip *ip; 351 struct ip6_hdr *ip6; 352 struct in6_ifaddr *ia6; 353 354 sc = (struct stf_softc*)ifp; 355 dst6 = (struct sockaddr_in6 *)dst; 356 357 /* just in case */ 358 if ((ifp->if_flags & IFF_UP) == 0) { 359 m_freem(m); 360 return ENETDOWN; 361 } 362 363 /* 364 * If we don't have an ip4 address that match my inner ip6 address, 365 * we shouldn't generate output. Without this check, we'll end up 366 * using wrong IPv4 source. 367 */ 368 ia6 = stf_getsrcifa6(ifp); 369 if (ia6 == NULL) { 370 m_freem(m); 371 ifp->if_oerrors++; 372 return ENETDOWN; 373 } 374 375 if (m->m_len < sizeof(*ip6)) { 376 m = m_pullup(m, sizeof(*ip6)); 377 if (m == NULL) { 378 ifp->if_oerrors++; 379 return ENOBUFS; 380 } 381 } 382 ip6 = mtod(m, struct ip6_hdr *); 383 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 384 385 /* 386 * Pickup the right outer dst addr from the list of candidates. 387 * ip6_dst has priority as it may be able to give us shorter IPv4 hops. 388 */ 389 if (IN6_IS_ADDR_6TO4(&ip6->ip6_dst)) 390 in4 = GET_V4(&ip6->ip6_dst); 391 else if (IN6_IS_ADDR_6TO4(&dst6->sin6_addr)) 392 in4 = GET_V4(&dst6->sin6_addr); 393 else { 394 m_freem(m); 395 ifp->if_oerrors++; 396 return ENETUNREACH; 397 } 398 399 #if NBPFILTER > 0 400 if (ifp->if_bpf) { 401 /* 402 * We need to prepend the address family as 403 * a four byte field. Cons up a dummy header 404 * to pacify bpf. This is safe because bpf 405 * will only read from the mbuf (i.e., it won't 406 * try to free it or keep a pointer a to it). 407 */ 408 struct mbuf m0; 409 u_int32_t af = AF_INET6; 410 411 m0.m_next = m; 412 m0.m_len = 4; 413 m0.m_data = (char *)⁡ 414 415 #ifdef HAVE_OLD_BPF 416 bpf_mtap(ifp, &m0); 417 #else 418 bpf_mtap(ifp->if_bpf, &m0); 419 #endif 420 } 421 #endif /*NBPFILTER > 0*/ 422 423 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 424 if (m && m->m_len < sizeof(struct ip)) 425 m = m_pullup(m, sizeof(struct ip)); 426 if (m == NULL) { 427 ifp->if_oerrors++; 428 return ENOBUFS; 429 } 430 ip = mtod(m, struct ip *); 431 432 memset(ip, 0, sizeof(*ip)); 433 434 bcopy(GET_V4(&((struct sockaddr_in6 *)&ia6->ia_addr)->sin6_addr), 435 &ip->ip_src, sizeof(ip->ip_src)); 436 bcopy(in4, &ip->ip_dst, sizeof(ip->ip_dst)); 437 ip->ip_p = IPPROTO_IPV6; 438 ip->ip_ttl = ip_gif_ttl; /*XXX*/ 439 ip->ip_len = m->m_pkthdr.len; /*host order*/ 440 if (ifp->if_flags & IFF_LINK1) 441 ip_ecn_ingress(ECN_ALLOWED, &ip->ip_tos, &tos); 442 else 443 ip_ecn_ingress(ECN_NOCARE, &ip->ip_tos, &tos); 444 445 dst4 = (struct sockaddr_in *)&sc->sc_ro.ro_dst; 446 if (dst4->sin_family != AF_INET || 447 bcmp(&dst4->sin_addr, &ip->ip_dst, sizeof(ip->ip_dst)) != 0) { 448 /* cache route doesn't match */ 449 dst4->sin_family = AF_INET; 450 dst4->sin_len = sizeof(struct sockaddr_in); 451 bcopy(&ip->ip_dst, &dst4->sin_addr, sizeof(dst4->sin_addr)); 452 if (sc->sc_ro.ro_rt) { 453 RTFREE(sc->sc_ro.ro_rt); 454 sc->sc_ro.ro_rt = NULL; 455 } 456 } 457 458 if (sc->sc_ro.ro_rt == NULL) { 459 rtalloc(&sc->sc_ro); 460 if (sc->sc_ro.ro_rt == NULL) { 461 m_freem(m); 462 ifp->if_oerrors++; 463 return ENETUNREACH; 464 } 465 } 466 467 ifp->if_opackets++; 468 return ip_output(m, NULL, &sc->sc_ro, 0, NULL); 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 * 10.0.0.0/8 172.16.0.0/12 192.168.0.0/16 493 */ 494 if ((ntohl(in->s_addr) & 0xff000000) >> 24 == 10 || 495 (ntohl(in->s_addr) & 0xfff00000) >> 16 == 172 * 256 + 16 || 496 (ntohl(in->s_addr) & 0xffff0000) >> 16 == 192 * 256 + 168) 497 return -1; 498 499 /* 500 * reject packets with broadcast 501 */ 502 TAILQ_FOREACH(ia4, &in_ifaddr, ia_list) 503 { 504 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0) 505 continue; 506 if (in->s_addr == ia4->ia_broadaddr.sin_addr.s_addr) 507 return -1; 508 } 509 510 /* 511 * perform ingress filter 512 */ 513 if (sc && (sc->sc_if.if_flags & IFF_LINK2) == 0 && inifp) { 514 struct sockaddr_in sin; 515 struct rtentry *rt; 516 517 memset(&sin, 0, sizeof(sin)); 518 sin.sin_family = AF_INET; 519 sin.sin_len = sizeof(struct sockaddr_in); 520 sin.sin_addr = *in; 521 rt = rtalloc1((struct sockaddr *)&sin, 0); 522 if (!rt || rt->rt_ifp != inifp) { 523 #if 0 524 log(LOG_WARNING, "%s: packet from 0x%x dropped " 525 "due to ingress filter\n", if_name(&sc->sc_if), 526 (u_int32_t)ntohl(sin.sin_addr.s_addr)); 527 #endif 528 if (rt) 529 rtfree(rt); 530 return -1; 531 } 532 rtfree(rt); 533 } 534 535 return 0; 536 } 537 538 static int 539 stf_checkaddr6(sc, in6, inifp) 540 struct stf_softc *sc; 541 struct in6_addr *in6; 542 struct ifnet *inifp; /* incoming interface */ 543 { 544 /* 545 * check 6to4 addresses 546 */ 547 if (IN6_IS_ADDR_6TO4(in6)) 548 return stf_checkaddr4(sc, GET_V4(in6), inifp); 549 550 /* 551 * reject anything that look suspicious. the test is implemented 552 * in ip6_input too, but we check here as well to 553 * (1) reject bad packets earlier, and 554 * (2) to be safe against future ip6_input change. 555 */ 556 if (IN6_IS_ADDR_V4COMPAT(in6) || IN6_IS_ADDR_V4MAPPED(in6)) 557 return -1; 558 559 return 0; 560 } 561 562 void 563 #if __STDC__ 564 in_stf_input(struct mbuf *m, ...) 565 #else 566 in_stf_input(m, va_alist) 567 struct mbuf *m; 568 #endif 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 /* 644 * We need to prepend the address family as 645 * a four byte field. Cons up a dummy header 646 * to pacify bpf. This is safe because bpf 647 * will only read from the mbuf (i.e., it won't 648 * try to free it or keep a pointer a to it). 649 */ 650 struct mbuf m0; 651 u_int32_t af = AF_INET6; 652 653 m0.m_next = m; 654 m0.m_len = 4; 655 m0.m_data = (char *)⁡ 656 657 #ifdef HAVE_OLD_BPF 658 bpf_mtap(ifp, &m0); 659 #else 660 bpf_mtap(ifp->if_bpf, &m0); 661 #endif 662 } 663 #endif /*NBPFILTER > 0*/ 664 665 /* 666 * Put the packet to the network layer input queue according to the 667 * specified address family. 668 * See net/if_gif.c for possible issues with packet processing 669 * reorder due to extra queueing. 670 */ 671 ifq = &ip6intrq; 672 isr = NETISR_IPV6; 673 674 s = splnet(); 675 if (IF_QFULL(ifq)) { 676 IF_DROP(ifq); /* update statistics */ 677 m_freem(m); 678 splx(s); 679 return; 680 } 681 IF_ENQUEUE(ifq, m); 682 schednetisr(isr); 683 ifp->if_ipackets++; 684 ifp->if_ibytes += m->m_pkthdr.len; 685 splx(s); 686 } 687 688 /* ARGSUSED */ 689 static void 690 stf_rtrequest(cmd, rt, info) 691 int cmd; 692 struct rtentry *rt; 693 struct rt_addrinfo *info; 694 { 695 696 if (rt) 697 rt->rt_rmx.rmx_mtu = STF_MTU; 698 } 699 700 static int 701 stf_ioctl(ifp, cmd, data) 702 struct ifnet *ifp; 703 u_long cmd; 704 caddr_t data; 705 { 706 struct ifaddr *ifa; 707 struct ifreq *ifr; 708 struct sockaddr_in6 *sin6; 709 int error; 710 711 error = 0; 712 switch (cmd) { 713 case SIOCSIFADDR: 714 ifa = (struct ifaddr *)data; 715 if (ifa == NULL || ifa->ifa_addr->sa_family != AF_INET6) { 716 error = EAFNOSUPPORT; 717 break; 718 } 719 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 720 if (IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) { 721 ifa->ifa_rtrequest = stf_rtrequest; 722 ifp->if_flags |= IFF_UP; 723 } else 724 error = EINVAL; 725 break; 726 727 case SIOCADDMULTI: 728 case SIOCDELMULTI: 729 ifr = (struct ifreq *)data; 730 if (ifr && ifr->ifr_addr.sa_family == AF_INET6) 731 ; 732 else 733 error = EAFNOSUPPORT; 734 break; 735 736 default: 737 error = EINVAL; 738 break; 739 } 740 741 return error; 742 } 743
Indexes created Sun Oct 19 02:09:48 GMT 2025