Dmitry Shmidt | a3a2260 | 2012-07-23 16:45:46 -0700 | [diff] [blame] | 1 | /* |
| 2 | * dhcpcd - DHCP client daemon |
| 3 | * Copyright (c) 2006-2012 Roy Marples <roy@marples.name> |
| 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 | * |
| 15 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
| 16 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 17 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 18 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| 19 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 20 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 21 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 22 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 23 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 24 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 25 | * SUCH DAMAGE. |
| 26 | */ |
| 27 | |
| 28 | #include <sys/param.h> |
| 29 | #include <sys/socket.h> |
| 30 | #include <net/if.h> |
| 31 | #include <netinet/in.h> |
| 32 | #include <netinet/ip6.h> |
| 33 | #include <netinet/icmp6.h> |
| 34 | |
| 35 | #include <errno.h> |
| 36 | #include <stddef.h> |
| 37 | #include <stdlib.h> |
| 38 | #include <string.h> |
| 39 | #include <syslog.h> |
| 40 | |
| 41 | #ifdef __linux__ |
| 42 | # define _LINUX_IN6_H |
| 43 | # include <linux/ipv6.h> |
| 44 | #endif |
| 45 | |
| 46 | #define ELOOP_QUEUE 1 |
| 47 | #include "bind.h" |
| 48 | #include "common.h" |
| 49 | #include "configure.h" |
| 50 | #include "dhcpcd.h" |
| 51 | #include "eloop.h" |
| 52 | #include "ipv6rs.h" |
| 53 | |
| 54 | #define ALLROUTERS "ff02::2" |
| 55 | #define HOPLIMIT 255 |
| 56 | |
| 57 | #define ROUNDUP8(a) (1 + (((a) - 1) | 7)) |
| 58 | |
| 59 | #define RTR_SOLICITATION_INTERVAL 4 /* seconds */ |
| 60 | #define MAX_RTR_SOLICITATIONS 3 /* times */ |
| 61 | |
| 62 | #ifndef ND_OPT_RDNSS |
| 63 | #define ND_OPT_RDNSS 25 |
| 64 | struct nd_opt_rdnss { /* RDNSS option RFC 6106 */ |
| 65 | uint8_t nd_opt_rdnss_type; |
| 66 | uint8_t nd_opt_rdnss_len; |
| 67 | uint16_t nd_opt_rdnss_reserved; |
| 68 | uint32_t nd_opt_rdnss_lifetime; |
| 69 | /* followed by list of IP prefixes */ |
| 70 | } _packed; |
| 71 | #endif |
| 72 | |
| 73 | #ifndef ND_OPT_DNSSL |
| 74 | #define ND_OPT_DNSSL 31 |
| 75 | struct nd_opt_dnssl { /* DNSSL option RFC 6106 */ |
| 76 | uint8_t nd_opt_dnssl_type; |
| 77 | uint8_t nd_opt_dnssl_len; |
| 78 | uint16_t nd_opt_dnssl_reserved; |
| 79 | uint32_t nd_opt_dnssl_lifetime; |
| 80 | /* followed by list of DNS servers */ |
| 81 | } _packed; |
| 82 | #endif |
| 83 | |
| 84 | static int sock; |
| 85 | static struct sockaddr_in6 allrouters, from; |
| 86 | static struct msghdr sndhdr; |
| 87 | static struct iovec sndiov[2]; |
| 88 | static unsigned char *sndbuf; |
| 89 | static struct msghdr rcvhdr; |
| 90 | static struct iovec rcviov[2]; |
| 91 | static unsigned char *rcvbuf; |
| 92 | static unsigned char ansbuf[1500]; |
| 93 | static char ntopbuf[INET6_ADDRSTRLEN]; |
| 94 | |
| 95 | #if DEBUG_MEMORY |
| 96 | static void |
| 97 | ipv6rs_cleanup(void) |
| 98 | { |
| 99 | |
| 100 | free(sndbuf); |
| 101 | free(rcvbuf); |
| 102 | } |
| 103 | #endif |
| 104 | |
| 105 | int |
| 106 | ipv6rs_open(void) |
| 107 | { |
| 108 | int on; |
| 109 | int len; |
| 110 | struct icmp6_filter filt; |
| 111 | |
| 112 | memset(&allrouters, 0, sizeof(allrouters)); |
| 113 | allrouters.sin6_family = AF_INET6; |
| 114 | #ifdef SIN6_LEN |
| 115 | allrouters.sin6_len = sizeof(allrouters); |
| 116 | #endif |
| 117 | if (inet_pton(AF_INET6, ALLROUTERS, &allrouters.sin6_addr.s6_addr) != 1) |
| 118 | return -1; |
| 119 | sock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6); |
| 120 | if (sock == -1) |
| 121 | return -1; |
| 122 | on = 1; |
| 123 | if (setsockopt(sock, IPPROTO_IPV6, IPV6_RECVPKTINFO, |
| 124 | &on, sizeof(on)) == -1) |
| 125 | return -1; |
| 126 | |
| 127 | on = 1; |
| 128 | if (setsockopt(sock, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, |
| 129 | &on, sizeof(on)) == -1) |
| 130 | return -1; |
| 131 | |
| 132 | ICMP6_FILTER_SETBLOCKALL(&filt); |
| 133 | ICMP6_FILTER_SETPASS(ND_ROUTER_ADVERT, &filt); |
| 134 | if (setsockopt(sock, IPPROTO_ICMPV6, ICMP6_FILTER, |
| 135 | &filt, sizeof(filt)) == -1) |
| 136 | return -1; |
| 137 | |
| 138 | #if DEBUG_MEMORY |
| 139 | atexit(ipv6rs_cleanup); |
| 140 | #endif |
| 141 | |
| 142 | len = CMSG_SPACE(sizeof(struct in6_pktinfo)) + CMSG_SPACE(sizeof(int)); |
| 143 | sndbuf = xzalloc(len); |
| 144 | if (sndbuf == NULL) |
| 145 | return -1; |
| 146 | sndhdr.msg_namelen = sizeof(struct sockaddr_in6); |
| 147 | sndhdr.msg_iov = sndiov; |
| 148 | sndhdr.msg_iovlen = 1; |
| 149 | sndhdr.msg_control = sndbuf; |
| 150 | sndhdr.msg_controllen = len; |
| 151 | rcvbuf = xzalloc(len); |
| 152 | if (rcvbuf == NULL) |
| 153 | return -1; |
| 154 | rcvhdr.msg_name = &from; |
| 155 | rcvhdr.msg_namelen = sizeof(from); |
| 156 | rcvhdr.msg_iov = rcviov; |
| 157 | rcvhdr.msg_iovlen = 1; |
| 158 | rcvhdr.msg_control = rcvbuf; |
| 159 | rcvhdr.msg_controllen = len; |
| 160 | rcviov[0].iov_base = ansbuf; |
| 161 | rcviov[0].iov_len = sizeof(ansbuf); |
| 162 | return sock; |
| 163 | } |
| 164 | |
| 165 | static int |
| 166 | ipv6rs_makeprobe(struct interface *ifp) |
| 167 | { |
| 168 | struct nd_router_solicit *rs; |
| 169 | struct nd_opt_hdr *nd; |
| 170 | |
| 171 | free(ifp->rs); |
| 172 | ifp->rslen = sizeof(*rs) + ROUNDUP8(ifp->hwlen + 2); |
| 173 | ifp->rs = xzalloc(ifp->rslen); |
| 174 | if (ifp->rs == NULL) |
| 175 | return -1; |
| 176 | rs = (struct nd_router_solicit *)ifp->rs; |
| 177 | rs->nd_rs_type = ND_ROUTER_SOLICIT; |
| 178 | rs->nd_rs_code = 0; |
| 179 | rs->nd_rs_cksum = 0; |
| 180 | rs->nd_rs_reserved = 0; |
| 181 | nd = (struct nd_opt_hdr *)(ifp->rs + sizeof(*rs)); |
| 182 | nd->nd_opt_type = ND_OPT_SOURCE_LINKADDR; |
| 183 | nd->nd_opt_len = (ROUNDUP8(ifp->hwlen + 2)) >> 3; |
| 184 | memcpy(nd + 1, ifp->hwaddr, ifp->hwlen); |
| 185 | return 0; |
| 186 | } |
| 187 | |
| 188 | static void |
| 189 | ipv6rs_sendprobe(void *arg) |
| 190 | { |
| 191 | struct interface *ifp = arg; |
| 192 | struct sockaddr_in6 dst; |
| 193 | struct cmsghdr *cm; |
| 194 | struct in6_pktinfo pi; |
| 195 | int hoplimit = HOPLIMIT; |
| 196 | |
| 197 | dst = allrouters; |
| 198 | //dst.sin6_scope_id = ifp->linkid; |
| 199 | |
| 200 | ipv6rs_makeprobe(ifp); |
| 201 | sndhdr.msg_name = (caddr_t)&dst; |
| 202 | sndhdr.msg_iov[0].iov_base = ifp->rs; |
| 203 | sndhdr.msg_iov[0].iov_len = ifp->rslen; |
| 204 | |
| 205 | /* Set the outbound interface */ |
| 206 | cm = CMSG_FIRSTHDR(&sndhdr); |
| 207 | cm->cmsg_level = IPPROTO_IPV6; |
| 208 | cm->cmsg_type = IPV6_PKTINFO; |
| 209 | cm->cmsg_len = CMSG_LEN(sizeof(pi)); |
| 210 | memset(&pi, 0, sizeof(pi)); |
| 211 | pi.ipi6_ifindex = if_nametoindex(ifp->name); |
| 212 | memcpy(CMSG_DATA(cm), &pi, sizeof(pi)); |
| 213 | |
| 214 | /* Hop limit */ |
| 215 | cm = CMSG_NXTHDR(&sndhdr, cm); |
| 216 | cm->cmsg_level = IPPROTO_IPV6; |
| 217 | cm->cmsg_type = IPV6_HOPLIMIT; |
| 218 | cm->cmsg_len = CMSG_LEN(sizeof(hoplimit)); |
| 219 | memcpy(CMSG_DATA(cm), &hoplimit, sizeof(hoplimit)); |
| 220 | |
| 221 | syslog(LOG_INFO, "%s: sending IPv6 Router Solicitation", ifp->name); |
| 222 | if (sendmsg(sock, &sndhdr, 0) == -1) |
| 223 | syslog(LOG_ERR, "%s: sendmsg: %m", ifp->name); |
| 224 | |
| 225 | if (ifp->rsprobes++ < MAX_RTR_SOLICITATIONS) |
| 226 | add_timeout_sec(RTR_SOLICITATION_INTERVAL, |
| 227 | ipv6rs_sendprobe, ifp); |
| 228 | else |
| 229 | syslog(LOG_INFO, "%s: no IPv6 Routers available", ifp->name); |
| 230 | } |
| 231 | |
| 232 | static void |
| 233 | ipv6rs_sort(struct interface *ifp) |
| 234 | { |
| 235 | struct ra *rap, *sorted, *ran, *rat; |
| 236 | |
| 237 | if (ifp->ras == NULL || ifp->ras->next == NULL) |
| 238 | return; |
| 239 | |
| 240 | /* Sort our RA's - most recent first */ |
| 241 | sorted = ifp->ras; |
| 242 | ifp->ras = ifp->ras->next; |
| 243 | sorted->next = NULL; |
| 244 | for (rap = ifp->ras; rap && (ran = rap->next, 1); rap = ran) { |
| 245 | /* Are we the new head? */ |
| 246 | if (timercmp(&rap->received, &sorted->received, <)) { |
| 247 | rap->next = sorted; |
| 248 | sorted = rap; |
| 249 | continue; |
| 250 | } |
| 251 | /* Do we fit in the middle? */ |
| 252 | for (rat = sorted; rat->next; rat = rat->next) { |
| 253 | if (timercmp(&rap->received, &rat->next->received, <)) { |
| 254 | rap->next = rat->next; |
| 255 | rat->next = rap; |
| 256 | break; |
| 257 | } |
| 258 | } |
| 259 | /* We must be at the end */ |
| 260 | if (!rat->next) { |
| 261 | rat->next = rap; |
| 262 | rap->next = NULL; |
| 263 | } |
| 264 | } |
| 265 | } |
| 266 | |
| 267 | void |
| 268 | ipv6rs_handledata(_unused void *arg) |
| 269 | { |
| 270 | ssize_t len, l, n, olen; |
| 271 | struct cmsghdr *cm; |
| 272 | int hoplimit; |
| 273 | struct in6_pktinfo pkt; |
| 274 | struct icmp6_hdr *icp; |
| 275 | struct interface *ifp; |
| 276 | const char *sfrom; |
| 277 | struct nd_router_advert *nd_ra; |
| 278 | struct nd_opt_prefix_info *pi; |
| 279 | struct nd_opt_mtu *mtu; |
| 280 | struct nd_opt_rdnss *rdnss; |
| 281 | struct nd_opt_dnssl *dnssl; |
| 282 | uint32_t lifetime; |
| 283 | uint8_t *p, *op; |
| 284 | struct in6_addr addr; |
| 285 | char buf[INET6_ADDRSTRLEN]; |
| 286 | const char *cbp; |
| 287 | struct ra *rap; |
| 288 | struct nd_opt_hdr *ndo; |
| 289 | struct ra_opt *rao, *raol; |
| 290 | char *opt; |
| 291 | struct timeval expire; |
| 292 | int has_dns; |
| 293 | |
| 294 | len = recvmsg(sock, &rcvhdr, 0); |
| 295 | if (len == -1) { |
| 296 | syslog(LOG_ERR, "recvmsg: %m"); |
| 297 | return; |
| 298 | } |
| 299 | sfrom = inet_ntop(AF_INET6, &from.sin6_addr, |
| 300 | ntopbuf, INET6_ADDRSTRLEN); |
| 301 | if ((size_t)len < sizeof(struct nd_router_advert)) { |
| 302 | syslog(LOG_ERR, "IPv6 RA packet too short from %s", sfrom); |
| 303 | return; |
| 304 | } |
| 305 | |
| 306 | pkt.ipi6_ifindex = hoplimit = 0; |
| 307 | for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(&rcvhdr); |
| 308 | cm; |
| 309 | cm = (struct cmsghdr *)CMSG_NXTHDR(&rcvhdr, cm)) |
| 310 | { |
| 311 | if (cm->cmsg_level != IPPROTO_IPV6) |
| 312 | continue; |
| 313 | switch(cm->cmsg_type) { |
| 314 | case IPV6_PKTINFO: |
| 315 | if (cm->cmsg_len == CMSG_LEN(sizeof(pkt))) |
| 316 | memcpy(&pkt, CMSG_DATA(cm), sizeof(pkt)); |
| 317 | break; |
| 318 | case IPV6_HOPLIMIT: |
| 319 | if (cm->cmsg_len == CMSG_LEN(sizeof(int))) |
| 320 | memcpy(&hoplimit, CMSG_DATA(cm), sizeof(int)); |
| 321 | break; |
| 322 | } |
| 323 | } |
| 324 | |
| 325 | if (pkt.ipi6_ifindex == 0 || hoplimit == 0) { |
| 326 | syslog(LOG_ERR, |
| 327 | "IPv6 RA did not contain index or hop limit from %s", |
| 328 | sfrom); |
| 329 | return; |
| 330 | } |
| 331 | |
| 332 | icp = (struct icmp6_hdr *)rcvhdr.msg_iov[0].iov_base; |
| 333 | if (icp->icmp6_type != ND_ROUTER_ADVERT || |
| 334 | icp->icmp6_code != 0) |
| 335 | { |
| 336 | syslog(LOG_ERR, "invalid IPv6 type or code from %s", sfrom); |
| 337 | return; |
| 338 | } |
| 339 | |
| 340 | if (!IN6_IS_ADDR_LINKLOCAL(&from.sin6_addr)) { |
| 341 | syslog(LOG_ERR, "RA recieved from non local IPv6 address %s", |
| 342 | sfrom); |
| 343 | return; |
| 344 | } |
| 345 | |
| 346 | for (ifp = ifaces; ifp; ifp = ifp->next) |
| 347 | if (if_nametoindex(ifp->name) == (unsigned int)pkt.ipi6_ifindex) |
| 348 | break; |
| 349 | if (ifp == NULL) { |
| 350 | syslog(LOG_ERR,"received RA for unexpected interface from %s", |
| 351 | sfrom); |
| 352 | return; |
| 353 | } |
| 354 | for (rap = ifp->ras; rap; rap = rap->next) { |
| 355 | if (memcmp(rap->from.s6_addr, from.sin6_addr.s6_addr, |
| 356 | sizeof(rap->from.s6_addr)) == 0) |
| 357 | break; |
| 358 | } |
| 359 | |
| 360 | /* We don't want to spam the log with the fact we got an RA every |
| 361 | * 30 seconds or so, so only spam the log if it's different. */ |
| 362 | if (options & DHCPCD_DEBUG || rap == NULL || |
| 363 | (rap->expired || rap->data_len != len || |
| 364 | memcmp(rap->data, (unsigned char *)icp, rap->data_len) != 0)) |
| 365 | { |
| 366 | if (rap) { |
| 367 | free(rap->data); |
| 368 | rap->data_len = 0; |
| 369 | } |
| 370 | syslog(LOG_INFO, "%s: Router Advertisement from %s", |
| 371 | ifp->name, sfrom); |
| 372 | } |
| 373 | |
| 374 | if (rap == NULL) { |
| 375 | rap = xmalloc(sizeof(*rap)); |
| 376 | rap->next = ifp->ras; |
| 377 | rap->options = NULL; |
| 378 | ifp->ras = rap; |
| 379 | memcpy(rap->from.s6_addr, from.sin6_addr.s6_addr, |
| 380 | sizeof(rap->from.s6_addr)); |
| 381 | strlcpy(rap->sfrom, sfrom, sizeof(rap->sfrom)); |
| 382 | rap->data_len = 0; |
| 383 | } |
| 384 | if (rap->data_len == 0) { |
| 385 | rap->data = xmalloc(len); |
| 386 | memcpy(rap->data, icp, len); |
| 387 | rap->data_len = len; |
| 388 | } |
| 389 | |
| 390 | get_monotonic(&rap->received); |
| 391 | nd_ra = (struct nd_router_advert *)icp; |
| 392 | rap->lifetime = ntohs(nd_ra->nd_ra_router_lifetime); |
| 393 | rap->expired = 0; |
| 394 | |
| 395 | len -= sizeof(struct nd_router_advert); |
| 396 | p = ((uint8_t *)icp) + sizeof(struct nd_router_advert); |
| 397 | olen = 0; |
| 398 | lifetime = ~0U; |
| 399 | has_dns = 0; |
| 400 | for (olen = 0; len > 0; p += olen, len -= olen) { |
| 401 | if ((size_t)len < sizeof(struct nd_opt_hdr)) { |
| 402 | syslog(LOG_ERR, "%s: Short option", ifp->name); |
| 403 | break; |
| 404 | } |
| 405 | ndo = (struct nd_opt_hdr *)p; |
| 406 | olen = ndo->nd_opt_len * 8 ; |
| 407 | if (olen == 0) { |
| 408 | syslog(LOG_ERR, "%s: zero length option", ifp->name); |
| 409 | break; |
| 410 | } |
| 411 | if (olen > len) { |
| 412 | syslog(LOG_ERR, |
| 413 | "%s: Option length exceeds message", ifp->name); |
| 414 | break; |
| 415 | } |
| 416 | |
| 417 | opt = NULL; |
| 418 | switch (ndo->nd_opt_type) { |
| 419 | case ND_OPT_PREFIX_INFORMATION: |
| 420 | pi = (struct nd_opt_prefix_info *)ndo; |
| 421 | if (pi->nd_opt_pi_len != 4) { |
| 422 | syslog(LOG_ERR, |
| 423 | "%s: invalid option len for prefix", |
| 424 | ifp->name); |
| 425 | break; |
| 426 | } |
| 427 | if (pi->nd_opt_pi_prefix_len > 128) { |
| 428 | syslog(LOG_ERR, "%s: invalid prefix len", |
| 429 | ifp->name); |
| 430 | break; |
| 431 | } |
| 432 | if (IN6_IS_ADDR_MULTICAST(&pi->nd_opt_pi_prefix) || |
| 433 | IN6_IS_ADDR_LINKLOCAL(&pi->nd_opt_pi_prefix)) |
| 434 | { |
| 435 | syslog(LOG_ERR, |
| 436 | "%s: invalid prefix in RA", ifp->name); |
| 437 | break; |
| 438 | } |
| 439 | opt = xstrdup(inet_ntop(AF_INET6, |
| 440 | pi->nd_opt_pi_prefix.s6_addr, |
| 441 | ntopbuf, INET6_ADDRSTRLEN)); |
| 442 | if (opt) { |
| 443 | rap->prefix_len = pi->nd_opt_pi_prefix_len; |
| 444 | rap->prefix_vltime = |
| 445 | ntohl(pi->nd_opt_pi_valid_time); |
| 446 | rap->prefix_pltime = |
| 447 | ntohl(pi->nd_opt_pi_preferred_time); |
| 448 | } |
| 449 | break; |
| 450 | |
| 451 | case ND_OPT_MTU: |
| 452 | mtu = (struct nd_opt_mtu *)p; |
| 453 | snprintf(buf, sizeof(buf), "%d", |
| 454 | ntohl(mtu->nd_opt_mtu_mtu)); |
| 455 | opt = xstrdup(buf); |
| 456 | break; |
| 457 | |
| 458 | case ND_OPT_RDNSS: |
| 459 | rdnss = (struct nd_opt_rdnss *)p; |
| 460 | lifetime = ntohl(rdnss->nd_opt_rdnss_lifetime); |
| 461 | op = (uint8_t *)ndo; |
| 462 | op += offsetof(struct nd_opt_rdnss, |
| 463 | nd_opt_rdnss_lifetime); |
| 464 | op += sizeof(rdnss->nd_opt_rdnss_lifetime); |
| 465 | l = 0; |
| 466 | for (n = ndo->nd_opt_len - 1; n > 1; n -= 2) { |
| 467 | memcpy(&addr.s6_addr, op, sizeof(addr.s6_addr)); |
| 468 | cbp = inet_ntop(AF_INET6, &addr, |
| 469 | ntopbuf, INET6_ADDRSTRLEN); |
| 470 | if (cbp == NULL) { |
| 471 | syslog(LOG_ERR, |
| 472 | "%s: invalid RDNSS address", |
| 473 | ifp->name); |
| 474 | } else { |
| 475 | if (opt) { |
| 476 | l = strlen(opt); |
| 477 | opt = xrealloc(opt, |
| 478 | l + strlen(cbp) + 2); |
| 479 | opt[l] = ' '; |
| 480 | strcpy(opt + l + 1, cbp); |
| 481 | } else |
| 482 | opt = xstrdup(cbp); |
| 483 | if (lifetime > 0) |
| 484 | has_dns = 1; |
| 485 | } |
| 486 | op += sizeof(addr.s6_addr); |
| 487 | } |
| 488 | break; |
| 489 | |
| 490 | case ND_OPT_DNSSL: |
| 491 | dnssl = (struct nd_opt_dnssl *)p; |
| 492 | lifetime = ntohl(dnssl->nd_opt_dnssl_lifetime); |
| 493 | op = p + offsetof(struct nd_opt_dnssl, |
| 494 | nd_opt_dnssl_lifetime); |
| 495 | op += sizeof(dnssl->nd_opt_dnssl_lifetime); |
| 496 | n = (dnssl->nd_opt_dnssl_len - 1) * 8; |
| 497 | l = decode_rfc3397(NULL, 0, n, op); |
| 498 | if (l < 1) { |
| 499 | syslog(LOG_ERR, "%s: invalid DNSSL option", |
| 500 | ifp->name); |
| 501 | } else { |
| 502 | opt = xmalloc(l); |
| 503 | decode_rfc3397(opt, l, n, op); |
| 504 | } |
| 505 | break; |
| 506 | } |
| 507 | |
| 508 | if (opt == NULL) |
| 509 | continue; |
| 510 | for (raol = NULL, rao = rap->options; |
| 511 | rao; |
| 512 | raol = rao, rao = rao->next) |
| 513 | { |
| 514 | if (rao->type == ndo->nd_opt_type && |
| 515 | strcmp(rao->option, opt) == 0) |
| 516 | break; |
| 517 | } |
| 518 | if (lifetime == 0) { |
| 519 | if (rao) { |
| 520 | if (raol) |
| 521 | raol->next = rao->next; |
| 522 | else |
| 523 | rap->options = rao->next; |
| 524 | free(rao->option); |
| 525 | free(rao); |
| 526 | } |
| 527 | continue; |
| 528 | } |
| 529 | |
| 530 | if (rao == NULL) { |
| 531 | rao = xmalloc(sizeof(*rao)); |
| 532 | rao->next = rap->options; |
| 533 | rap->options = rao; |
| 534 | rao->type = ndo->nd_opt_type; |
| 535 | rao->option = opt; |
| 536 | } else |
| 537 | free(opt); |
| 538 | if (lifetime == ~0U) |
| 539 | timerclear(&rao->expire); |
| 540 | else { |
| 541 | expire.tv_sec = lifetime; |
| 542 | expire.tv_usec = 0; |
| 543 | timeradd(&rap->received, &expire, &rao->expire); |
| 544 | } |
| 545 | } |
| 546 | |
| 547 | ipv6rs_sort(ifp); |
| 548 | run_script_reason(ifp, options & DHCPCD_TEST ? "TEST" : "ROUTERADVERT"); |
| 549 | if (options & DHCPCD_TEST) |
| 550 | exit(EXIT_SUCCESS); |
| 551 | |
| 552 | /* If we don't require RDNSS then set has_dns = 1 so we fork */ |
| 553 | if (!(ifp->state->options->options & DHCPCD_IPV6RA_REQRDNSS)) |
| 554 | has_dns = 1; |
| 555 | |
| 556 | if (has_dns) |
| 557 | delete_q_timeout(0, handle_exit_timeout, NULL); |
| 558 | delete_timeout(NULL, ifp); |
| 559 | ipv6rs_expire(ifp); |
| 560 | if (has_dns) |
| 561 | daemonise(); |
| 562 | else if (options & DHCPCD_DAEMONISE && !(options & DHCPCD_DAEMONISED)) |
| 563 | syslog(LOG_WARNING, |
| 564 | "%s: did not fork due to an absent RDNSS option in the RA", |
| 565 | ifp->name); |
| 566 | } |
| 567 | |
| 568 | ssize_t |
| 569 | ipv6rs_env(char **env, const char *prefix, const struct interface *ifp) |
| 570 | { |
| 571 | ssize_t l; |
| 572 | struct timeval now; |
| 573 | const struct ra *rap; |
| 574 | const struct ra_opt *rao; |
| 575 | int i; |
| 576 | char buffer[32], buffer2[32]; |
| 577 | const char *optn; |
| 578 | |
| 579 | l = 0; |
| 580 | get_monotonic(&now); |
| 581 | for (rap = ifp->ras, i = 1; rap; rap = rap->next, i++) { |
| 582 | if (env) { |
| 583 | snprintf(buffer, sizeof(buffer), |
| 584 | "ra%d_from", i); |
| 585 | setvar(&env, prefix, buffer, rap->sfrom); |
| 586 | } |
| 587 | l++; |
| 588 | |
| 589 | for (rao = rap->options; rao; rao = rao->next) { |
| 590 | if (rao->option == NULL) |
| 591 | continue; |
| 592 | if (env == NULL) { |
| 593 | switch (rao->type) { |
| 594 | case ND_OPT_PREFIX_INFORMATION: |
| 595 | l += 4; |
| 596 | break; |
| 597 | default: |
| 598 | l++; |
| 599 | } |
| 600 | continue; |
| 601 | } |
| 602 | switch (rao->type) { |
| 603 | case ND_OPT_PREFIX_INFORMATION: |
| 604 | optn = "prefix"; |
| 605 | break; |
| 606 | case ND_OPT_MTU: |
| 607 | optn = "mtu"; |
| 608 | break; |
| 609 | case ND_OPT_RDNSS: |
| 610 | optn = "rdnss"; |
| 611 | break; |
| 612 | case ND_OPT_DNSSL: |
| 613 | optn = "dnssl"; |
| 614 | break; |
| 615 | default: |
| 616 | continue; |
| 617 | } |
| 618 | snprintf(buffer, sizeof(buffer), "ra%d_%s", i, optn); |
| 619 | setvar(&env, prefix, buffer, rao->option); |
| 620 | l++; |
| 621 | switch (rao->type) { |
| 622 | case ND_OPT_PREFIX_INFORMATION: |
| 623 | snprintf(buffer, sizeof(buffer), |
| 624 | "ra%d_prefix_len", i); |
| 625 | snprintf(buffer2, sizeof(buffer2), |
| 626 | "%d", rap->prefix_len); |
| 627 | setvar(&env, prefix, buffer, buffer2); |
| 628 | |
| 629 | snprintf(buffer, sizeof(buffer), |
| 630 | "ra%d_prefix_vltime", i); |
| 631 | snprintf(buffer2, sizeof(buffer2), |
| 632 | "%d", rap->prefix_vltime); |
| 633 | setvar(&env, prefix, buffer, buffer2); |
| 634 | |
| 635 | snprintf(buffer, sizeof(buffer), |
| 636 | "ra%d_prefix_pltime", i); |
| 637 | snprintf(buffer2, sizeof(buffer2), |
| 638 | "%d", rap->prefix_pltime); |
| 639 | setvar(&env, prefix, buffer, buffer2); |
| 640 | l += 3; |
| 641 | break; |
| 642 | } |
| 643 | |
| 644 | } |
| 645 | } |
| 646 | |
| 647 | if (env) |
| 648 | setvard(&env, prefix, "ra_count", i - 1); |
| 649 | l++; |
| 650 | return l; |
| 651 | } |
| 652 | |
| 653 | static void |
| 654 | ipv6rs_free_opts(struct ra *rap) |
| 655 | { |
| 656 | struct ra_opt *rao, *raon; |
| 657 | |
| 658 | for (rao = rap->options; rao && (raon = rao->next, 1); rao = raon) { |
| 659 | free(rao->option); |
| 660 | free(rao); |
| 661 | } |
| 662 | } |
| 663 | |
| 664 | void |
| 665 | ipv6rs_free(struct interface *ifp) |
| 666 | { |
| 667 | struct ra *rap, *ran; |
| 668 | |
| 669 | free(ifp->rs); |
| 670 | ifp->rs = NULL; |
| 671 | for (rap = ifp->ras; rap && (ran = rap->next, 1); rap = ran) { |
| 672 | ipv6rs_free_opts(rap); |
| 673 | free(rap->data); |
| 674 | free(rap); |
| 675 | } |
| 676 | ifp->ras = NULL; |
| 677 | } |
| 678 | |
| 679 | void |
| 680 | ipv6rs_expire(void *arg) |
| 681 | { |
| 682 | struct interface *ifp; |
| 683 | struct ra *rap, *ran, *ral; |
| 684 | struct ra_opt *rao, *raol, *raon; |
| 685 | struct timeval now, lt, expire, next; |
| 686 | int expired; |
| 687 | uint32_t expire_secs; |
| 688 | |
| 689 | ifp = arg; |
| 690 | get_monotonic(&now); |
| 691 | expired = 0; |
| 692 | expire_secs = ~0U; |
| 693 | timerclear(&next); |
| 694 | |
| 695 | for (rap = ifp->ras, ral = NULL; |
| 696 | rap && (ran = rap->next, 1); |
| 697 | ral = rap, rap = ran) |
| 698 | { |
| 699 | lt.tv_sec = rap->lifetime; |
| 700 | lt.tv_usec = 0; |
| 701 | timeradd(&rap->received, <, &expire); |
| 702 | if (timercmp(&now, &expire, >)) { |
| 703 | syslog(LOG_INFO, "%s: %s: expired Router Advertisement", |
| 704 | ifp->name, rap->sfrom); |
| 705 | rap->expired = expired = 1; |
| 706 | if (ral) |
| 707 | ral->next = ran; |
| 708 | else |
| 709 | ifp->ras = ran; |
| 710 | ipv6rs_free_opts(rap); |
| 711 | free(rap); |
| 712 | continue; |
| 713 | } |
| 714 | timersub(&expire, &now, <); |
| 715 | if (!timerisset(&next) || timercmp(&next, <, >)) |
| 716 | next = lt; |
| 717 | |
| 718 | for (rao = rap->options, raol = NULL; |
| 719 | rao && (raon = rao->next); |
| 720 | raol = rao, rao = raon) |
| 721 | { |
| 722 | if (!timerisset(&rao->expire)) |
| 723 | continue; |
| 724 | if (timercmp(&now, &rao->expire, >)) { |
| 725 | syslog(LOG_INFO, |
| 726 | "%s: %s: expired option %d", |
| 727 | ifp->name, rap->sfrom, rao->type); |
| 728 | rap->expired = expired = 1; |
| 729 | if (raol) |
| 730 | raol = raon; |
| 731 | else |
| 732 | rap->options = raon; |
| 733 | continue; |
| 734 | } |
| 735 | timersub(&rao->expire, &now, <); |
| 736 | if (!timerisset(&next) || timercmp(&next, <, >)) |
| 737 | next = lt; |
| 738 | } |
| 739 | } |
| 740 | |
| 741 | if (timerisset(&next)) |
| 742 | add_timeout_tv(&next, ipv6rs_expire, ifp); |
| 743 | if (expired) |
| 744 | run_script_reason(ifp, "ROUTERADVERT"); |
| 745 | } |
| 746 | |
| 747 | int |
| 748 | ipv6rs_start(struct interface *ifp) |
| 749 | { |
| 750 | |
| 751 | delete_timeout(NULL, ifp); |
| 752 | |
| 753 | /* Always make a new probe as the underlying hardware |
| 754 | * address could have changed. */ |
| 755 | ipv6rs_makeprobe(ifp); |
| 756 | if (ifp->rs == NULL) |
| 757 | return -1; |
| 758 | |
| 759 | ifp->rsprobes = 0; |
| 760 | ipv6rs_sendprobe(ifp); |
| 761 | return 0; |
| 762 | } |