| 1 | /* $FreeBSD: src/sys/netinet6/in6_src.c,v 1.1.2.3 2002/02/26 18:02:06 ume Exp $ */ |
| 2 | /* $DragonFly: src/sys/netinet6/in6_src.c,v 1.4 2003/06/25 03:56:04 dillon Exp $ */ |
| 3 | /* $KAME: in6_src.c,v 1.37 2001/03/29 05:34:31 itojun Exp $ */ |
| 4 | |
| 5 | /* |
| 6 | * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. |
| 7 | * All rights reserved. |
| 8 | * |
| 9 | * Redistribution and use in source and binary forms, with or without |
| 10 | * modification, are permitted provided that the following conditions |
| 11 | * are met: |
| 12 | * 1. Redistributions of source code must retain the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer. |
| 14 | * 2. Redistributions in binary form must reproduce the above copyright |
| 15 | * notice, this list of conditions and the following disclaimer in the |
| 16 | * documentation and/or other materials provided with the distribution. |
| 17 | * 3. Neither the name of the project nor the names of its contributors |
| 18 | * may be used to endorse or promote products derived from this software |
| 19 | * without specific prior written permission. |
| 20 | * |
| 21 | * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND |
| 22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE |
| 25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 31 | * SUCH DAMAGE. |
| 32 | */ |
| 33 | |
| 34 | /* |
| 35 | * Copyright (c) 1982, 1986, 1991, 1993 |
| 36 | * The Regents of the University of California. All rights reserved. |
| 37 | * |
| 38 | * Redistribution and use in source and binary forms, with or without |
| 39 | * modification, are permitted provided that the following conditions |
| 40 | * are met: |
| 41 | * 1. Redistributions of source code must retain the above copyright |
| 42 | * notice, this list of conditions and the following disclaimer. |
| 43 | * 2. Redistributions in binary form must reproduce the above copyright |
| 44 | * notice, this list of conditions and the following disclaimer in the |
| 45 | * documentation and/or other materials provided with the distribution. |
| 46 | * 3. All advertising materials mentioning features or use of this software |
| 47 | * must display the following acknowledgement: |
| 48 | * This product includes software developed by the University of |
| 49 | * California, Berkeley and its contributors. |
| 50 | * 4. Neither the name of the University nor the names of its contributors |
| 51 | * may be used to endorse or promote products derived from this software |
| 52 | * without specific prior written permission. |
| 53 | * |
| 54 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 55 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 56 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 57 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 58 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 59 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 60 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 61 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 62 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 63 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 64 | * SUCH DAMAGE. |
| 65 | * |
| 66 | * @(#)in_pcb.c 8.2 (Berkeley) 1/4/94 |
| 67 | */ |
| 68 | |
| 69 | #include "opt_inet.h" |
| 70 | #include "opt_inet6.h" |
| 71 | |
| 72 | #include <sys/param.h> |
| 73 | #include <sys/systm.h> |
| 74 | #include <sys/malloc.h> |
| 75 | #include <sys/mbuf.h> |
| 76 | #include <sys/protosw.h> |
| 77 | #include <sys/socket.h> |
| 78 | #include <sys/socketvar.h> |
| 79 | #include <sys/errno.h> |
| 80 | #include <sys/time.h> |
| 81 | #include <sys/proc.h> |
| 82 | |
| 83 | #include <net/if.h> |
| 84 | #include <net/route.h> |
| 85 | |
| 86 | #include <netinet/in.h> |
| 87 | #include <netinet/in_var.h> |
| 88 | #include <netinet/in_systm.h> |
| 89 | #include <netinet/ip.h> |
| 90 | #include <netinet/in_pcb.h> |
| 91 | #include <netinet6/in6_var.h> |
| 92 | #include <netinet/ip6.h> |
| 93 | #include <netinet6/in6_pcb.h> |
| 94 | #include <netinet6/ip6_var.h> |
| 95 | #include <netinet6/nd6.h> |
| 96 | #ifdef ENABLE_DEFAULT_SCOPE |
| 97 | #include <netinet6/scope6_var.h> |
| 98 | #endif |
| 99 | |
| 100 | #include <net/net_osdep.h> |
| 101 | |
| 102 | #include "loop.h" |
| 103 | |
| 104 | /* |
| 105 | * Return an IPv6 address, which is the most appropriate for a given |
| 106 | * destination and user specified options. |
| 107 | * If necessary, this function lookups the routing table and returns |
| 108 | * an entry to the caller for later use. |
| 109 | */ |
| 110 | struct in6_addr * |
| 111 | in6_selectsrc(dstsock, opts, mopts, ro, laddr, errorp) |
| 112 | struct sockaddr_in6 *dstsock; |
| 113 | struct ip6_pktopts *opts; |
| 114 | struct ip6_moptions *mopts; |
| 115 | struct route_in6 *ro; |
| 116 | struct in6_addr *laddr; |
| 117 | int *errorp; |
| 118 | { |
| 119 | struct in6_addr *dst; |
| 120 | struct in6_ifaddr *ia6 = 0; |
| 121 | struct in6_pktinfo *pi = NULL; |
| 122 | |
| 123 | dst = &dstsock->sin6_addr; |
| 124 | *errorp = 0; |
| 125 | |
| 126 | /* |
| 127 | * If the source address is explicitly specified by the caller, |
| 128 | * use it. |
| 129 | */ |
| 130 | if (opts && (pi = opts->ip6po_pktinfo) && |
| 131 | !IN6_IS_ADDR_UNSPECIFIED(&pi->ipi6_addr)) |
| 132 | return(&pi->ipi6_addr); |
| 133 | |
| 134 | /* |
| 135 | * If the source address is not specified but the socket(if any) |
| 136 | * is already bound, use the bound address. |
| 137 | */ |
| 138 | if (laddr && !IN6_IS_ADDR_UNSPECIFIED(laddr)) |
| 139 | return(laddr); |
| 140 | |
| 141 | /* |
| 142 | * If the caller doesn't specify the source address but |
| 143 | * the outgoing interface, use an address associated with |
| 144 | * the interface. |
| 145 | */ |
| 146 | if (pi && pi->ipi6_ifindex) { |
| 147 | /* XXX boundary check is assumed to be already done. */ |
| 148 | ia6 = in6_ifawithscope(ifindex2ifnet[pi->ipi6_ifindex], |
| 149 | dst); |
| 150 | if (ia6 == 0) { |
| 151 | *errorp = EADDRNOTAVAIL; |
| 152 | return(0); |
| 153 | } |
| 154 | return(&satosin6(&ia6->ia_addr)->sin6_addr); |
| 155 | } |
| 156 | |
| 157 | /* |
| 158 | * If the destination address is a link-local unicast address or |
| 159 | * a multicast address, and if the outgoing interface is specified |
| 160 | * by the sin6_scope_id filed, use an address associated with the |
| 161 | * interface. |
| 162 | * XXX: We're now trying to define more specific semantics of |
| 163 | * sin6_scope_id field, so this part will be rewritten in |
| 164 | * the near future. |
| 165 | */ |
| 166 | if ((IN6_IS_ADDR_LINKLOCAL(dst) || IN6_IS_ADDR_MULTICAST(dst)) && |
| 167 | dstsock->sin6_scope_id) { |
| 168 | /* |
| 169 | * I'm not sure if boundary check for scope_id is done |
| 170 | * somewhere... |
| 171 | */ |
| 172 | if (dstsock->sin6_scope_id < 0 || |
| 173 | if_index < dstsock->sin6_scope_id) { |
| 174 | *errorp = ENXIO; /* XXX: better error? */ |
| 175 | return(0); |
| 176 | } |
| 177 | ia6 = in6_ifawithscope(ifindex2ifnet[dstsock->sin6_scope_id], |
| 178 | dst); |
| 179 | if (ia6 == 0) { |
| 180 | *errorp = EADDRNOTAVAIL; |
| 181 | return(0); |
| 182 | } |
| 183 | return(&satosin6(&ia6->ia_addr)->sin6_addr); |
| 184 | } |
| 185 | |
| 186 | /* |
| 187 | * If the destination address is a multicast address and |
| 188 | * the outgoing interface for the address is specified |
| 189 | * by the caller, use an address associated with the interface. |
| 190 | * There is a sanity check here; if the destination has node-local |
| 191 | * scope, the outgoing interfacde should be a loopback address. |
| 192 | * Even if the outgoing interface is not specified, we also |
| 193 | * choose a loopback interface as the outgoing interface. |
| 194 | */ |
| 195 | if (IN6_IS_ADDR_MULTICAST(dst)) { |
| 196 | struct ifnet *ifp = mopts ? mopts->im6o_multicast_ifp : NULL; |
| 197 | |
| 198 | if (ifp == NULL && IN6_IS_ADDR_MC_NODELOCAL(dst)) { |
| 199 | ifp = &loif[0]; |
| 200 | } |
| 201 | |
| 202 | if (ifp) { |
| 203 | ia6 = in6_ifawithscope(ifp, dst); |
| 204 | if (ia6 == 0) { |
| 205 | *errorp = EADDRNOTAVAIL; |
| 206 | return(0); |
| 207 | } |
| 208 | return(&satosin6(&ia6->ia_addr)->sin6_addr); |
| 209 | } |
| 210 | } |
| 211 | |
| 212 | /* |
| 213 | * If the next hop address for the packet is specified |
| 214 | * by caller, use an address associated with the route |
| 215 | * to the next hop. |
| 216 | */ |
| 217 | { |
| 218 | struct sockaddr_in6 *sin6_next; |
| 219 | struct rtentry *rt; |
| 220 | |
| 221 | if (opts && opts->ip6po_nexthop) { |
| 222 | sin6_next = satosin6(opts->ip6po_nexthop); |
| 223 | rt = nd6_lookup(&sin6_next->sin6_addr, 1, NULL); |
| 224 | if (rt) { |
| 225 | ia6 = in6_ifawithscope(rt->rt_ifp, dst); |
| 226 | if (ia6 == 0) |
| 227 | ia6 = ifatoia6(rt->rt_ifa); |
| 228 | } |
| 229 | if (ia6 == 0) { |
| 230 | *errorp = EADDRNOTAVAIL; |
| 231 | return(0); |
| 232 | } |
| 233 | return(&satosin6(&ia6->ia_addr)->sin6_addr); |
| 234 | } |
| 235 | } |
| 236 | |
| 237 | /* |
| 238 | * If route is known or can be allocated now, |
| 239 | * our src addr is taken from the i/f, else punt. |
| 240 | */ |
| 241 | if (ro) { |
| 242 | if (ro->ro_rt && |
| 243 | (!(ro->ro_rt->rt_flags & RTF_UP) || |
| 244 | satosin6(&ro->ro_dst)->sin6_family != AF_INET6 || |
| 245 | !IN6_ARE_ADDR_EQUAL(&satosin6(&ro->ro_dst)->sin6_addr, |
| 246 | dst))) { |
| 247 | RTFREE(ro->ro_rt); |
| 248 | ro->ro_rt = (struct rtentry *)0; |
| 249 | } |
| 250 | if (ro->ro_rt == (struct rtentry *)0 || |
| 251 | ro->ro_rt->rt_ifp == (struct ifnet *)0) { |
| 252 | struct sockaddr_in6 *sa6; |
| 253 | |
| 254 | /* No route yet, so try to acquire one */ |
| 255 | bzero(&ro->ro_dst, sizeof(struct sockaddr_in6)); |
| 256 | sa6 = (struct sockaddr_in6 *)&ro->ro_dst; |
| 257 | sa6->sin6_family = AF_INET6; |
| 258 | sa6->sin6_len = sizeof(struct sockaddr_in6); |
| 259 | sa6->sin6_addr = *dst; |
| 260 | sa6->sin6_scope_id = dstsock->sin6_scope_id; |
| 261 | if (IN6_IS_ADDR_MULTICAST(dst)) { |
| 262 | ro->ro_rt = rtalloc1(&((struct route *)ro) |
| 263 | ->ro_dst, 0, 0UL); |
| 264 | } else { |
| 265 | rtalloc((struct route *)ro); |
| 266 | } |
| 267 | } |
| 268 | |
| 269 | /* |
| 270 | * in_pcbconnect() checks out IFF_LOOPBACK to skip using |
| 271 | * the address. But we don't know why it does so. |
| 272 | * It is necessary to ensure the scope even for lo0 |
| 273 | * so doesn't check out IFF_LOOPBACK. |
| 274 | */ |
| 275 | |
| 276 | if (ro->ro_rt) { |
| 277 | ia6 = in6_ifawithscope(ro->ro_rt->rt_ifa->ifa_ifp, dst); |
| 278 | if (ia6 == 0) /* xxx scope error ?*/ |
| 279 | ia6 = ifatoia6(ro->ro_rt->rt_ifa); |
| 280 | } |
| 281 | #if 0 |
| 282 | /* |
| 283 | * xxx The followings are necessary? (kazu) |
| 284 | * I don't think so. |
| 285 | * It's for SO_DONTROUTE option in IPv4.(jinmei) |
| 286 | */ |
| 287 | if (ia6 == 0) { |
| 288 | struct sockaddr_in6 sin6 = {sizeof(sin6), AF_INET6, 0}; |
| 289 | |
| 290 | sin6->sin6_addr = *dst; |
| 291 | |
| 292 | ia6 = ifatoia6(ifa_ifwithdstaddr(sin6tosa(&sin6))); |
| 293 | if (ia6 == 0) |
| 294 | ia6 = ifatoia6(ifa_ifwithnet(sin6tosa(&sin6))); |
| 295 | if (ia6 == 0) |
| 296 | return(0); |
| 297 | return(&satosin6(&ia6->ia_addr)->sin6_addr); |
| 298 | } |
| 299 | #endif /* 0 */ |
| 300 | if (ia6 == 0) { |
| 301 | *errorp = EHOSTUNREACH; /* no route */ |
| 302 | return(0); |
| 303 | } |
| 304 | return(&satosin6(&ia6->ia_addr)->sin6_addr); |
| 305 | } |
| 306 | |
| 307 | *errorp = EADDRNOTAVAIL; |
| 308 | return(0); |
| 309 | } |
| 310 | |
| 311 | /* |
| 312 | * Default hop limit selection. The precedence is as follows: |
| 313 | * 1. Hoplimit value specified via ioctl. |
| 314 | * 2. (If the outgoing interface is detected) the current |
| 315 | * hop limit of the interface specified by router advertisement. |
| 316 | * 3. The system default hoplimit. |
| 317 | */ |
| 318 | int |
| 319 | in6_selecthlim(in6p, ifp) |
| 320 | struct in6pcb *in6p; |
| 321 | struct ifnet *ifp; |
| 322 | { |
| 323 | if (in6p && in6p->in6p_hops >= 0) |
| 324 | return(in6p->in6p_hops); |
| 325 | else if (ifp) |
| 326 | return(nd_ifinfo[ifp->if_index].chlim); |
| 327 | else |
| 328 | return(ip6_defhlim); |
| 329 | } |
| 330 | |
| 331 | /* |
| 332 | * XXX: this is borrowed from in6_pcbbind(). If possible, we should |
| 333 | * share this function by all *bsd*... |
| 334 | */ |
| 335 | int |
| 336 | in6_pcbsetport(struct in6_addr *laddr, struct inpcb *inp, struct thread *td) |
| 337 | { |
| 338 | struct socket *so = inp->inp_socket; |
| 339 | u_int16_t lport = 0, first, last, *lastport; |
| 340 | int count, error = 0, wild = 0; |
| 341 | struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; |
| 342 | |
| 343 | /* XXX: this is redundant when called from in6_pcbbind */ |
| 344 | if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0) |
| 345 | wild = INPLOOKUP_WILDCARD; |
| 346 | |
| 347 | inp->inp_flags |= INP_ANONPORT; |
| 348 | |
| 349 | if (inp->inp_flags & INP_HIGHPORT) { |
| 350 | first = ipport_hifirstauto; /* sysctl */ |
| 351 | last = ipport_hilastauto; |
| 352 | lastport = &pcbinfo->lasthi; |
| 353 | } else if (inp->inp_flags & INP_LOWPORT) { |
| 354 | if ((error = suser(td)) != 0) |
| 355 | return error; |
| 356 | first = ipport_lowfirstauto; /* 1023 */ |
| 357 | last = ipport_lowlastauto; /* 600 */ |
| 358 | lastport = &pcbinfo->lastlow; |
| 359 | } else { |
| 360 | first = ipport_firstauto; /* sysctl */ |
| 361 | last = ipport_lastauto; |
| 362 | lastport = &pcbinfo->lastport; |
| 363 | } |
| 364 | /* |
| 365 | * Simple check to ensure all ports are not used up causing |
| 366 | * a deadlock here. |
| 367 | * |
| 368 | * We split the two cases (up and down) so that the direction |
| 369 | * is not being tested on each round of the loop. |
| 370 | */ |
| 371 | if (first > last) { |
| 372 | /* |
| 373 | * counting down |
| 374 | */ |
| 375 | count = first - last; |
| 376 | |
| 377 | do { |
| 378 | if (count-- < 0) { /* completely used? */ |
| 379 | /* |
| 380 | * Undo any address bind that may have |
| 381 | * occurred above. |
| 382 | */ |
| 383 | inp->in6p_laddr = in6addr_any; |
| 384 | return (EAGAIN); |
| 385 | } |
| 386 | --*lastport; |
| 387 | if (*lastport > first || *lastport < last) |
| 388 | *lastport = first; |
| 389 | lport = htons(*lastport); |
| 390 | } while (in6_pcblookup_local(pcbinfo, |
| 391 | &inp->in6p_laddr, lport, wild)); |
| 392 | } else { |
| 393 | /* |
| 394 | * counting up |
| 395 | */ |
| 396 | count = last - first; |
| 397 | |
| 398 | do { |
| 399 | if (count-- < 0) { /* completely used? */ |
| 400 | /* |
| 401 | * Undo any address bind that may have |
| 402 | * occurred above. |
| 403 | */ |
| 404 | inp->in6p_laddr = in6addr_any; |
| 405 | return (EAGAIN); |
| 406 | } |
| 407 | ++*lastport; |
| 408 | if (*lastport < first || *lastport > last) |
| 409 | *lastport = first; |
| 410 | lport = htons(*lastport); |
| 411 | } while (in6_pcblookup_local(pcbinfo, |
| 412 | &inp->in6p_laddr, lport, wild)); |
| 413 | } |
| 414 | |
| 415 | inp->inp_lport = lport; |
| 416 | if (in_pcbinshash(inp) != 0) { |
| 417 | inp->in6p_laddr = in6addr_any; |
| 418 | inp->inp_lport = 0; |
| 419 | return (EAGAIN); |
| 420 | } |
| 421 | |
| 422 | return(0); |
| 423 | } |
| 424 | |
| 425 | /* |
| 426 | * generate kernel-internal form (scopeid embedded into s6_addr16[1]). |
| 427 | * If the address scope of is link-local, embed the interface index in the |
| 428 | * address. The routine determines our precedence |
| 429 | * between advanced API scope/interface specification and basic API |
| 430 | * specification. |
| 431 | * |
| 432 | * this function should be nuked in the future, when we get rid of |
| 433 | * embedded scopeid thing. |
| 434 | * |
| 435 | * XXX actually, it is over-specification to return ifp against sin6_scope_id. |
| 436 | * there can be multiple interfaces that belong to a particular scope zone |
| 437 | * (in specification, we have 1:N mapping between a scope zone and interfaces). |
| 438 | * we may want to change the function to return something other than ifp. |
| 439 | */ |
| 440 | int |
| 441 | in6_embedscope(in6, sin6, in6p, ifpp) |
| 442 | struct in6_addr *in6; |
| 443 | const struct sockaddr_in6 *sin6; |
| 444 | #ifdef HAVE_NRL_INPCB |
| 445 | struct inpcb *in6p; |
| 446 | #define in6p_outputopts inp_outputopts6 |
| 447 | #define in6p_moptions inp_moptions6 |
| 448 | #else |
| 449 | struct in6pcb *in6p; |
| 450 | #endif |
| 451 | struct ifnet **ifpp; |
| 452 | { |
| 453 | struct ifnet *ifp = NULL; |
| 454 | u_int32_t scopeid; |
| 455 | |
| 456 | *in6 = sin6->sin6_addr; |
| 457 | scopeid = sin6->sin6_scope_id; |
| 458 | if (ifpp) |
| 459 | *ifpp = NULL; |
| 460 | |
| 461 | /* |
| 462 | * don't try to read sin6->sin6_addr beyond here, since the caller may |
| 463 | * ask us to overwrite existing sockaddr_in6 |
| 464 | */ |
| 465 | |
| 466 | #ifdef ENABLE_DEFAULT_SCOPE |
| 467 | if (scopeid == 0) |
| 468 | scopeid = scope6_addr2default(in6); |
| 469 | #endif |
| 470 | |
| 471 | if (IN6_IS_SCOPE_LINKLOCAL(in6)) { |
| 472 | struct in6_pktinfo *pi; |
| 473 | |
| 474 | /* |
| 475 | * KAME assumption: link id == interface id |
| 476 | */ |
| 477 | |
| 478 | if (in6p && in6p->in6p_outputopts && |
| 479 | (pi = in6p->in6p_outputopts->ip6po_pktinfo) && |
| 480 | pi->ipi6_ifindex) { |
| 481 | ifp = ifindex2ifnet[pi->ipi6_ifindex]; |
| 482 | in6->s6_addr16[1] = htons(pi->ipi6_ifindex); |
| 483 | } else if (in6p && IN6_IS_ADDR_MULTICAST(in6) && |
| 484 | in6p->in6p_moptions && |
| 485 | in6p->in6p_moptions->im6o_multicast_ifp) { |
| 486 | ifp = in6p->in6p_moptions->im6o_multicast_ifp; |
| 487 | in6->s6_addr16[1] = htons(ifp->if_index); |
| 488 | } else if (scopeid) { |
| 489 | /* boundary check */ |
| 490 | if (scopeid < 0 || if_index < scopeid) |
| 491 | return ENXIO; /* XXX EINVAL? */ |
| 492 | ifp = ifindex2ifnet[scopeid]; |
| 493 | /*XXX assignment to 16bit from 32bit variable */ |
| 494 | in6->s6_addr16[1] = htons(scopeid & 0xffff); |
| 495 | } |
| 496 | |
| 497 | if (ifpp) |
| 498 | *ifpp = ifp; |
| 499 | } |
| 500 | |
| 501 | return 0; |
| 502 | } |
| 503 | #ifdef HAVE_NRL_INPCB |
| 504 | #undef in6p_outputopts |
| 505 | #undef in6p_moptions |
| 506 | #endif |
| 507 | |
| 508 | /* |
| 509 | * generate standard sockaddr_in6 from embedded form. |
| 510 | * touches sin6_addr and sin6_scope_id only. |
| 511 | * |
| 512 | * this function should be nuked in the future, when we get rid of |
| 513 | * embedded scopeid thing. |
| 514 | */ |
| 515 | int |
| 516 | in6_recoverscope(sin6, in6, ifp) |
| 517 | struct sockaddr_in6 *sin6; |
| 518 | const struct in6_addr *in6; |
| 519 | struct ifnet *ifp; |
| 520 | { |
| 521 | u_int32_t scopeid; |
| 522 | |
| 523 | sin6->sin6_addr = *in6; |
| 524 | |
| 525 | /* |
| 526 | * don't try to read *in6 beyond here, since the caller may |
| 527 | * ask us to overwrite existing sockaddr_in6 |
| 528 | */ |
| 529 | |
| 530 | sin6->sin6_scope_id = 0; |
| 531 | if (IN6_IS_SCOPE_LINKLOCAL(in6)) { |
| 532 | /* |
| 533 | * KAME assumption: link id == interface id |
| 534 | */ |
| 535 | scopeid = ntohs(sin6->sin6_addr.s6_addr16[1]); |
| 536 | if (scopeid) { |
| 537 | /* sanity check */ |
| 538 | if (scopeid < 0 || if_index < scopeid) |
| 539 | return ENXIO; |
| 540 | if (ifp && ifp->if_index != scopeid) |
| 541 | return ENXIO; |
| 542 | sin6->sin6_addr.s6_addr16[1] = 0; |
| 543 | sin6->sin6_scope_id = scopeid; |
| 544 | } |
| 545 | } |
| 546 | |
| 547 | return 0; |
| 548 | } |
| 549 | |
| 550 | /* |
| 551 | * just clear the embedded scope identifer. |
| 552 | * XXX: currently used for bsdi4 only as a supplement function. |
| 553 | */ |
| 554 | void |
| 555 | in6_clearscope(addr) |
| 556 | struct in6_addr *addr; |
| 557 | { |
| 558 | if (IN6_IS_SCOPE_LINKLOCAL(addr)) |
| 559 | addr->s6_addr16[1] = 0; |
| 560 | } |