Lorenzo Colitti | 313379e | 2013-07-11 01:07:11 +0900 | [diff] [blame] | 1 | /* $USAGI: ninfod_addrs.c,v 1.18 2003-07-16 09:49:01 yoshfuji Exp $ */ |
| 2 | /* |
| 3 | * Copyright (C) 2002 USAGI/WIDE Project. |
| 4 | * All rights reserved. |
| 5 | * |
| 6 | * Redistribution and use in source and binary forms, with or without |
| 7 | * modification, are permitted provided that the following conditions |
| 8 | * are met: |
| 9 | * 1. Redistributions of source code must retain the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer. |
| 11 | * 2. Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
| 14 | * 3. Neither the name of the project nor the names of its contributors |
| 15 | * may be used to endorse or promote products derived from this software |
| 16 | * without specific prior written permission. |
| 17 | * |
| 18 | * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND |
| 19 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 20 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 21 | * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE |
| 22 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 23 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 24 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 25 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 26 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 27 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 28 | * SUCH DAMAGE. |
| 29 | */ |
| 30 | /* |
| 31 | * Author: |
| 32 | * YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> |
| 33 | */ |
| 34 | |
| 35 | #if HAVE_CONFIG_H |
| 36 | #include "config.h" |
| 37 | #endif |
| 38 | |
| 39 | #if HAVE_SYS_TYPES_H |
| 40 | # include <sys/types.h> |
| 41 | #endif |
| 42 | |
| 43 | #if STDC_HEADERS |
| 44 | # include <stdio.h> |
| 45 | # include <stdlib.h> |
| 46 | # include <stddef.h> |
| 47 | #else |
| 48 | # if HAVE_STDLIB_H |
| 49 | # include <stdlib.h> |
| 50 | # endif |
| 51 | #endif |
| 52 | #if HAVE_STRING_H |
| 53 | # if !STDC_HEADERS && HAVE_MEMORY_H |
| 54 | # include <memory.h> |
| 55 | # endif |
| 56 | # include <string.h> |
| 57 | #endif |
| 58 | #if HAVE_STRINGS_H |
| 59 | # include <strings.h> |
| 60 | #endif |
| 61 | #if HAVE_INTTYPES_H |
| 62 | # include <inttypes.h> |
| 63 | #else |
| 64 | # if HAVE_STDINT_H |
| 65 | # include <stdint.h> |
| 66 | # endif |
| 67 | #endif |
| 68 | #if HAVE_UNISTD_H |
| 69 | # include <unistd.h> |
| 70 | #endif |
| 71 | |
| 72 | #if TIME_WITH_SYS_TIME |
| 73 | # include <sys/time.h> |
| 74 | # include <time.h> |
| 75 | #else |
| 76 | # if HAVE_SYS_TIME_H |
| 77 | # include <sys/time.h> |
| 78 | # else |
| 79 | # include <time.h> |
| 80 | # endif |
| 81 | #endif |
| 82 | |
| 83 | #if HAVE_SYS_UIO_H |
| 84 | #include <sys/uio.h> |
| 85 | #endif |
| 86 | |
| 87 | #include <sys/socket.h> |
| 88 | #if HAVE_LINUX_RTNETLINK_H |
| 89 | #include <asm/types.h> |
| 90 | #include <linux/rtnetlink.h> |
| 91 | #endif |
| 92 | |
| 93 | #if HAVE_NETINET_IN_H |
| 94 | # include <netinet/in.h> |
| 95 | #endif |
| 96 | |
| 97 | #if HAVE_NETINET_IP6_H |
| 98 | # include <netinet/ip6.h> |
| 99 | #endif |
| 100 | |
| 101 | #if HAVE_NETINET_ICMP6_H |
| 102 | # include <netinet/icmp6.h> |
| 103 | #endif |
| 104 | #ifndef HAVE_STRUCT_ICMP6_NODEINFO |
| 105 | # include "icmp6_nodeinfo.h" |
| 106 | #endif |
| 107 | |
| 108 | #if HAVE_NETDB_H |
| 109 | # include <netdb.h> |
| 110 | #endif |
| 111 | #include <errno.h> |
| 112 | |
| 113 | #if HAVE_SYSLOG_H |
| 114 | # include <syslog.h> |
| 115 | #endif |
| 116 | |
| 117 | #include "ninfod.h" |
| 118 | #include "ni_ifaddrs.h" |
| 119 | |
| 120 | #ifndef offsetof |
| 121 | # define offsetof(aggregate,member) ((size_t)&((aggregate *)0)->member) |
| 122 | #endif |
| 123 | |
| 124 | /* ---------- */ |
| 125 | /* ID */ |
| 126 | static char *RCSID __attribute__ ((unused)) = "$USAGI: ninfod_addrs.c,v 1.18 2003-07-16 09:49:01 yoshfuji Exp $"; |
| 127 | |
| 128 | /* ---------- */ |
| 129 | /* ipv6 address */ |
| 130 | void init_nodeinfo_ipv6addr(INIT_ARGS) |
| 131 | { |
| 132 | DEBUG(LOG_DEBUG, "%s()\n", __func__); |
| 133 | return; |
| 134 | } |
| 135 | |
| 136 | int filter_ipv6addr(const struct in6_addr *ifaddr, unsigned int flags) |
| 137 | { |
| 138 | if (IN6_IS_ADDR_UNSPECIFIED(ifaddr) || |
| 139 | IN6_IS_ADDR_LOOPBACK(ifaddr)) { |
| 140 | return 1; |
| 141 | } else if (IN6_IS_ADDR_V4COMPAT(ifaddr) || |
| 142 | IN6_IS_ADDR_V4MAPPED(ifaddr)) { |
| 143 | return !(flags & NI_NODEADDR_FLAG_COMPAT); |
| 144 | } else if (IN6_IS_ADDR_LINKLOCAL(ifaddr)) { |
| 145 | return !(flags & NI_NODEADDR_FLAG_LINKLOCAL); |
| 146 | } else if (IN6_IS_ADDR_SITELOCAL(ifaddr)) { |
| 147 | return !(flags & NI_NODEADDR_FLAG_SITELOCAL); |
| 148 | } |
| 149 | return !(flags & NI_NODEADDR_FLAG_GLOBAL); |
| 150 | } |
| 151 | |
| 152 | int pr_nodeinfo_ipv6addr(CHECKANDFILL_ARGS) |
| 153 | { |
| 154 | struct ni_ifaddrs *ifa0; |
| 155 | unsigned int ifindex = 0; |
| 156 | |
| 157 | DEBUG(LOG_DEBUG, "%s()\n", __func__); |
| 158 | |
| 159 | if (subject && subjlen != sizeof(struct in6_addr)) { |
| 160 | DEBUG(LOG_INFO, |
| 161 | "%s(): invalid subject length %zu for IPv6 Address Subject\n", |
| 162 | __func__, subjlen); |
| 163 | return 1; |
| 164 | } |
| 165 | if (ni_ifaddrs(&ifa0, AF_INET6)) |
| 166 | return -1; /* failed to get addresses */ |
| 167 | |
| 168 | /* pass 0: consider subject and determine subjected interface */ |
| 169 | if (subject) { |
| 170 | struct ni_ifaddrs *ifa; |
| 171 | |
| 172 | for (ifa = ifa0; ifa; ifa = ifa->ifa_next) { |
| 173 | if (!ifa->ifa_addr) |
| 174 | continue; |
| 175 | if (ifa->ifa_flags & (IFA_F_TENTATIVE|IFA_F_SECONDARY)) |
| 176 | continue; |
| 177 | if (!ifindex && |
| 178 | IN6_ARE_ADDR_EQUAL(&p->pktinfo.ipi6_addr, |
| 179 | (struct in6_addr *)subject)) { |
| 180 | /* |
| 181 | * if subject is equal to destination |
| 182 | * address, receiving interface is |
| 183 | * the candidate subject interface. |
| 184 | */ |
| 185 | ifindex = p->pktinfo.ipi6_ifindex; |
| 186 | } |
| 187 | if (!IN6_IS_ADDR_LOOPBACK((struct in6_addr *)subject) && |
| 188 | IN6_ARE_ADDR_EQUAL((struct in6_addr *)ifa->ifa_addr, |
| 189 | (struct in6_addr *)subject)) { |
| 190 | /* |
| 191 | * address is assigned on some interface. |
| 192 | * if multiple interfaces have the same interface, |
| 193 | * 1) prefer receiving interface |
| 194 | * 2) use first found one |
| 195 | */ |
| 196 | if (!ifindex || |
| 197 | (p->pktinfo.ipi6_ifindex == ifindex)) |
| 198 | ifindex = ifa->ifa_ifindex; |
| 199 | } |
| 200 | } |
| 201 | if (!ifindex) { |
| 202 | ni_freeifaddrs(ifa0); |
| 203 | return 1; /* subject not found */ |
| 204 | } |
| 205 | if (subj_if) |
| 206 | *subj_if = ifindex; |
| 207 | } else { |
| 208 | ifindex = subj_if ? *subj_if : 0; |
| 209 | if (ifindex == 0) |
| 210 | ifindex = p->pktinfo.ipi6_ifindex; |
| 211 | if (ifindex == 0) { |
| 212 | ni_freeifaddrs(ifa0); |
| 213 | return 1; /* XXX */ |
| 214 | } |
| 215 | } |
| 216 | |
| 217 | if (reply) { |
| 218 | struct ni_ifaddrs *ifa; |
| 219 | unsigned int addrs0 = 0, paddrs0 = 0; |
| 220 | unsigned int addrs, paddrs = 0, daddrs = 0; |
| 221 | |
| 222 | flags &= ~NI_NODEADDR_FLAG_TRUNCATE; |
| 223 | |
| 224 | /* pass 1: count addresses and preferred addresses to be returned */ |
| 225 | for (ifa = ifa0; ifa; ifa = ifa->ifa_next) { |
| 226 | if (!ifa->ifa_addr) |
| 227 | continue; |
| 228 | if (ifa->ifa_flags & (IFA_F_TENTATIVE|IFA_F_SECONDARY)) |
| 229 | continue; |
| 230 | if (!(flags & NI_NODEADDR_FLAG_ALL) && |
| 231 | ifa->ifa_ifindex != ifindex) |
| 232 | continue; |
| 233 | if (filter_ipv6addr((struct in6_addr *)ifa->ifa_addr, flags)) |
| 234 | continue; |
| 235 | |
| 236 | if (addrs0 + 1 >= ((MAX_REPLY_SIZE - sizeof(struct icmp6_nodeinfo)) / (sizeof(uint32_t) + sizeof(struct in6_addr)))) { |
| 237 | flags |= ~NI_NODEADDR_FLAG_TRUNCATE; |
| 238 | break; |
| 239 | } |
| 240 | |
| 241 | addrs0++; |
| 242 | if (!(ifa->ifa_flags & IFA_F_DEPRECATED)) |
| 243 | paddrs0++; |
| 244 | } |
| 245 | |
| 246 | p->reply.ni_type = ICMP6_NI_REPLY; |
| 247 | p->reply.ni_code = ICMP6_NI_SUCCESS; |
| 248 | p->reply.ni_cksum = 0; |
| 249 | p->reply.ni_qtype = htons(NI_QTYPE_NODEADDR); |
| 250 | p->reply.ni_flags = flags&(NI_NODEADDR_FLAG_COMPAT| |
| 251 | NI_NODEADDR_FLAG_LINKLOCAL| |
| 252 | NI_NODEADDR_FLAG_SITELOCAL| |
| 253 | NI_NODEADDR_FLAG_GLOBAL); |
| 254 | |
| 255 | /* pass 2: store addresses */ |
| 256 | p->replydatalen = (sizeof(uint32_t)+sizeof(struct in6_addr)) * addrs0; |
| 257 | p->replydata = p->replydatalen ? ni_malloc(p->replydatalen) : NULL; |
| 258 | |
| 259 | if (p->replydatalen && !p->replydata) { |
| 260 | p->reply.ni_flags |= NI_NODEADDR_FLAG_TRUNCATE; |
| 261 | addrs0 = paddrs0 = 0; |
| 262 | } |
| 263 | |
| 264 | for (ifa = ifa0, addrs = 0; |
| 265 | ifa && addrs < addrs0; |
| 266 | ifa = ifa->ifa_next) { |
| 267 | char *cp; |
| 268 | uint32_t ttl; |
| 269 | |
| 270 | if (!ifa->ifa_addr) |
| 271 | continue; |
| 272 | if (ifa->ifa_flags & (IFA_F_TENTATIVE|IFA_F_SECONDARY)) |
| 273 | continue; |
| 274 | if (!(flags & NI_NODEADDR_FLAG_ALL) && |
| 275 | ((subj_if && *subj_if) ? (ifa->ifa_ifindex != *subj_if) : |
| 276 | (ifa->ifa_ifindex != p->pktinfo.ipi6_ifindex))) |
| 277 | continue; |
| 278 | if (filter_ipv6addr((struct in6_addr *)ifa->ifa_addr, flags)) |
| 279 | continue; |
| 280 | |
| 281 | #if ENABLE_TTL |
| 282 | if (ifa->ifa_cacheinfo) { |
| 283 | ttl = ifa->ifa_cacheinfo->ifa_valid > 0x7fffffff ? |
| 284 | htonl(0x7fffffff) : htonl(ifa->ifa_cacheinfo->ifa_valid); |
| 285 | } else { |
| 286 | ttl = (ifa->ifa_flags & IFA_F_PERMANENT) ? htonl(0x7fffffff) : 0; |
| 287 | } |
| 288 | #else |
| 289 | ttl = 0; |
| 290 | #endif |
| 291 | |
| 292 | cp = p->replydata + |
| 293 | (sizeof(uint32_t)+sizeof(struct in6_addr)) * (ifa->ifa_flags & IFA_F_DEPRECATED ? paddrs0+daddrs : paddrs); |
| 294 | memcpy(cp, &ttl, sizeof(ttl)); |
| 295 | memcpy(cp + sizeof(ttl), ifa->ifa_addr, sizeof(struct in6_addr)); |
| 296 | |
| 297 | addrs++; |
| 298 | if (ifa->ifa_flags & IFA_F_DEPRECATED) |
| 299 | daddrs++; |
| 300 | else |
| 301 | paddrs++; |
| 302 | } |
| 303 | } |
| 304 | |
| 305 | ni_freeifaddrs(ifa0); |
| 306 | return 0; |
| 307 | } |
| 308 | |
| 309 | /* ipv4 address */ |
| 310 | void init_nodeinfo_ipv4addr(INIT_ARGS) |
| 311 | { |
| 312 | DEBUG(LOG_DEBUG, "%s()\n", __func__); |
| 313 | return; |
| 314 | } |
| 315 | |
| 316 | int filter_ipv4addr(const struct in_addr *ifaddr, unsigned int flags) |
| 317 | { |
| 318 | return 0; |
| 319 | } |
| 320 | |
| 321 | int pr_nodeinfo_ipv4addr(CHECKANDFILL_ARGS) |
| 322 | { |
| 323 | struct ni_ifaddrs *ifa0; |
| 324 | unsigned int ifindex = 0; |
| 325 | |
| 326 | DEBUG(LOG_DEBUG, "%s()\n", __func__); |
| 327 | |
| 328 | if (subject && subjlen != sizeof(struct in_addr)) { |
| 329 | DEBUG(LOG_INFO, |
| 330 | "%s(): invalid subject length %zu for IPv4 Address Subject\n", |
| 331 | __func__, subjlen); |
| 332 | return 1; |
| 333 | } |
| 334 | if (ni_ifaddrs(&ifa0, AF_INET)) |
| 335 | return -1; /* failed to get addresses */ |
| 336 | |
| 337 | /* pass 0: consider subject and determine subjected interface */ |
| 338 | if (subject) { |
| 339 | struct ni_ifaddrs *ifa; |
| 340 | |
| 341 | for (ifa = ifa0; ifa; ifa = ifa->ifa_next) { |
| 342 | if (!ifa->ifa_addr) |
| 343 | continue; |
| 344 | if (ifa->ifa_flags & (IFA_F_TENTATIVE|IFA_F_SECONDARY)) |
| 345 | continue; |
| 346 | if ((((struct in_addr *)subject)->s_addr != htonl(INADDR_LOOPBACK)) && |
| 347 | memcmp((struct in_addr *)ifa->ifa_addr, |
| 348 | (struct in_addr *)subject, |
| 349 | sizeof(struct in_addr)) == 0) { |
| 350 | /* |
| 351 | * address is assigned on some interface. |
| 352 | * if multiple interfaces have the same interface, |
| 353 | * 1) prefer receiving interface |
| 354 | * 2) use first found one |
| 355 | */ |
| 356 | if (!ifindex || |
| 357 | (p->pktinfo.ipi6_ifindex == ifindex)) |
| 358 | ifindex = ifa->ifa_ifindex; |
| 359 | } |
| 360 | } |
| 361 | if (!ifindex) { |
| 362 | ni_freeifaddrs(ifa0); |
| 363 | return 1; /* subject not found */ |
| 364 | } |
| 365 | if (subj_if) |
| 366 | *subj_if = ifindex; |
| 367 | } else { |
| 368 | ifindex = subj_if ? *subj_if : 0; |
| 369 | if (ifindex == 0) |
| 370 | ifindex = p->pktinfo.ipi6_ifindex; |
| 371 | if (ifindex == 0) { |
| 372 | ni_freeifaddrs(ifa0); |
| 373 | return 1; /* XXX */ |
| 374 | } |
| 375 | } |
| 376 | |
| 377 | if (reply) { |
| 378 | struct ni_ifaddrs *ifa; |
| 379 | unsigned int addrs0 = 0, paddrs0 = 0; |
| 380 | unsigned int addrs, paddrs = 0, daddrs = 0; |
| 381 | |
| 382 | flags &= ~NI_IPV4ADDR_FLAG_TRUNCATE; |
| 383 | |
| 384 | /* pass 1: count addresses and preferred addresses to be returned */ |
| 385 | for (ifa = ifa0; ifa; ifa = ifa->ifa_next) { |
| 386 | if (!ifa->ifa_addr) |
| 387 | continue; |
| 388 | #if 1 /* not used in kernel */ |
| 389 | if (ifa->ifa_flags & (IFA_F_TENTATIVE)) |
| 390 | continue; |
| 391 | #endif |
| 392 | if (!(flags & NI_NODEADDR_FLAG_ALL) && |
| 393 | ((subj_if && *subj_if) ? (ifa->ifa_ifindex != *subj_if) : |
| 394 | (ifa->ifa_ifindex != p->pktinfo.ipi6_ifindex))) |
| 395 | continue; |
| 396 | if (filter_ipv4addr((struct in_addr *)ifa->ifa_addr, flags)) |
| 397 | continue; |
| 398 | |
| 399 | if (addrs0 + 1 >= ((MAX_REPLY_SIZE - sizeof(struct icmp6_nodeinfo)) / (sizeof(uint32_t) + sizeof(struct in_addr)))) { |
| 400 | flags |= NI_IPV4ADDR_FLAG_TRUNCATE; |
| 401 | break; |
| 402 | } |
| 403 | |
| 404 | addrs0++; |
| 405 | if (!(ifa->ifa_flags & IFA_F_DEPRECATED)) |
| 406 | paddrs0++; |
| 407 | } |
| 408 | |
| 409 | p->reply.ni_type = ICMP6_NI_REPLY; |
| 410 | p->reply.ni_code = ICMP6_NI_SUCCESS; |
| 411 | p->reply.ni_cksum = 0; |
| 412 | p->reply.ni_qtype = htons(NI_QTYPE_IPV4ADDR); |
| 413 | p->reply.ni_flags = flags & NI_IPV4ADDR_FLAG_ALL; |
| 414 | |
| 415 | /* pass 2: store addresses */ |
| 416 | p->replydatalen = (sizeof(uint32_t)+sizeof(struct in_addr)) * addrs0; |
| 417 | p->replydata = addrs0 ? ni_malloc(p->replydatalen) : NULL; |
| 418 | |
| 419 | if (p->replydatalen && !p->replydata) { |
| 420 | p->reply.ni_flags |= NI_NODEADDR_FLAG_TRUNCATE; |
| 421 | addrs0 = paddrs0 = 0; |
| 422 | } |
| 423 | |
| 424 | for (ifa = ifa0, addrs = 0; |
| 425 | ifa && addrs < addrs0; |
| 426 | ifa = ifa->ifa_next) { |
| 427 | char *cp; |
| 428 | uint32_t ttl; |
| 429 | |
| 430 | if (!ifa->ifa_addr) |
| 431 | continue; |
| 432 | #if 1 /* not used in kernel */ |
| 433 | if (ifa->ifa_flags & (IFA_F_TENTATIVE)) |
| 434 | continue; |
| 435 | #endif |
| 436 | if (!(flags & NI_NODEADDR_FLAG_ALL) && |
| 437 | (ifa->ifa_ifindex != ifindex)) |
| 438 | continue; |
| 439 | if (filter_ipv4addr((struct in_addr *)ifa->ifa_addr, flags)) |
| 440 | continue; |
| 441 | |
| 442 | #if ENABLE_TTL |
| 443 | if (ifa->ifa_cacheinfo) { |
| 444 | ttl = ifa->ifa_cacheinfo->ifa_valid > 0x7fffffff ? |
| 445 | htonl(0x7fffffff) : htonl(ifa->ifa_cacheinfo->ifa_valid); |
| 446 | } else { |
| 447 | ttl = 0; /*XXX*/ |
| 448 | } |
| 449 | #else |
| 450 | ttl = 0; |
| 451 | #endif |
| 452 | |
| 453 | cp = (p->replydata + |
| 454 | (sizeof(uint32_t)+sizeof(struct in_addr)) * (ifa->ifa_flags & IFA_F_DEPRECATED ? paddrs0+daddrs : paddrs)); |
| 455 | memcpy(cp, &ttl, sizeof(ttl)); |
| 456 | memcpy(cp + sizeof(ttl), ifa->ifa_addr, sizeof(struct in_addr)); |
| 457 | |
| 458 | addrs++; |
| 459 | if (ifa->ifa_flags & IFA_F_DEPRECATED) |
| 460 | daddrs++; |
| 461 | else |
| 462 | paddrs++; |
| 463 | } |
| 464 | } |
| 465 | |
| 466 | ni_freeifaddrs(ifa0); |
| 467 | return 0; |
| 468 | } |
| 469 | |