Samuel Tan | d7ed851 | 2015-08-13 16:11:35 -0700 | [diff] [blame] | 1 | /* |
| 2 | * dhcpcd - DHCP client daemon |
| 3 | * Copyright (c) 2006-2015 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/ioctl.h> |
| 29 | #include <sys/param.h> |
| 30 | #include <sys/socket.h> |
| 31 | #include <net/if.h> |
| 32 | #include <net/route.h> |
| 33 | #include <netinet/in.h> |
| 34 | #include <netinet/ip6.h> |
| 35 | #include <netinet/icmp6.h> |
| 36 | |
| 37 | #include <errno.h> |
| 38 | #include <fcntl.h> |
| 39 | #include <stddef.h> |
| 40 | #include <stdlib.h> |
| 41 | #include <string.h> |
| 42 | #include <unistd.h> |
| 43 | |
| 44 | #define ELOOP_QUEUE 3 |
| 45 | #include "common.h" |
| 46 | #include "dhcpcd.h" |
| 47 | #include "dhcp6.h" |
| 48 | #include "eloop.h" |
| 49 | #include "if.h" |
| 50 | #include "ipv6.h" |
| 51 | #include "ipv6nd.h" |
| 52 | #include "script.h" |
| 53 | |
| 54 | /* Debugging Router Solicitations is a lot of spam, so disable it */ |
| 55 | //#define DEBUG_RS |
| 56 | |
| 57 | #ifndef ND_OPT_RDNSS |
| 58 | #define ND_OPT_RDNSS 25 |
| 59 | struct nd_opt_rdnss { /* RDNSS option RFC 6106 */ |
| 60 | uint8_t nd_opt_rdnss_type; |
| 61 | uint8_t nd_opt_rdnss_len; |
| 62 | uint16_t nd_opt_rdnss_reserved; |
| 63 | uint32_t nd_opt_rdnss_lifetime; |
| 64 | /* followed by list of IP prefixes */ |
| 65 | } __packed; |
| 66 | #endif |
| 67 | |
| 68 | #ifndef ND_OPT_DNSSL |
| 69 | #define ND_OPT_DNSSL 31 |
| 70 | struct nd_opt_dnssl { /* DNSSL option RFC 6106 */ |
| 71 | uint8_t nd_opt_dnssl_type; |
| 72 | uint8_t nd_opt_dnssl_len; |
| 73 | uint16_t nd_opt_dnssl_reserved; |
| 74 | uint32_t nd_opt_dnssl_lifetime; |
| 75 | /* followed by list of DNS servers */ |
| 76 | } __packed; |
| 77 | #endif |
| 78 | |
| 79 | /* Impossible options, so we can easily add extras */ |
| 80 | #define _ND_OPT_PREFIX_ADDR 255 + 1 |
| 81 | |
| 82 | /* Minimal IPv6 MTU */ |
| 83 | #ifndef IPV6_MMTU |
| 84 | #define IPV6_MMTU 1280 |
| 85 | #endif |
| 86 | |
| 87 | #ifndef ND_RA_FLAG_RTPREF_HIGH |
| 88 | #define ND_RA_FLAG_RTPREF_MASK 0x18 |
| 89 | #define ND_RA_FLAG_RTPREF_HIGH 0x08 |
| 90 | #define ND_RA_FLAG_RTPREF_MEDIUM 0x00 |
| 91 | #define ND_RA_FLAG_RTPREF_LOW 0x18 |
| 92 | #define ND_RA_FLAG_RTPREF_RSV 0x10 |
| 93 | #endif |
| 94 | |
| 95 | /* RTPREF_MEDIUM has to be 0! */ |
| 96 | #define RTPREF_HIGH 1 |
| 97 | #define RTPREF_MEDIUM 0 |
| 98 | #define RTPREF_LOW (-1) |
| 99 | #define RTPREF_RESERVED (-2) |
| 100 | #define RTPREF_INVALID (-3) /* internal */ |
| 101 | |
| 102 | #define MIN_RANDOM_FACTOR 500 /* millisecs */ |
| 103 | #define MAX_RANDOM_FACTOR 1500 /* millisecs */ |
| 104 | #define MIN_RANDOM_FACTOR_U MIN_RANDOM_FACTOR * 1000 /* usecs */ |
| 105 | #define MAX_RANDOM_FACTOR_U MAX_RANDOM_FACTOR * 1000 /* usecs */ |
| 106 | |
| 107 | #if BYTE_ORDER == BIG_ENDIAN |
| 108 | #define IPV6_ADDR_INT32_ONE 1 |
| 109 | #define IPV6_ADDR_INT16_MLL 0xff02 |
| 110 | #elif BYTE_ORDER == LITTLE_ENDIAN |
| 111 | #define IPV6_ADDR_INT32_ONE 0x01000000 |
| 112 | #define IPV6_ADDR_INT16_MLL 0x02ff |
| 113 | #endif |
| 114 | |
| 115 | /* Debugging Neighbor Solicitations is a lot of spam, so disable it */ |
| 116 | //#define DEBUG_NS |
| 117 | // |
| 118 | |
| 119 | static void ipv6nd_handledata(void *); |
| 120 | |
| 121 | /* |
| 122 | * Android ships buggy ICMP6 filter headers. |
| 123 | * Supply our own until they fix their shit. |
| 124 | * References: |
| 125 | * https://android-review.googlesource.com/#/c/58438/ |
| 126 | * http://code.google.com/p/android/issues/original?id=32621&seq=24 |
| 127 | */ |
| 128 | #ifdef __ANDROID__ |
| 129 | #undef ICMP6_FILTER_WILLPASS |
| 130 | #undef ICMP6_FILTER_WILLBLOCK |
| 131 | #undef ICMP6_FILTER_SETPASS |
| 132 | #undef ICMP6_FILTER_SETBLOCK |
| 133 | #undef ICMP6_FILTER_SETPASSALL |
| 134 | #undef ICMP6_FILTER_SETBLOCKALL |
| 135 | #define ICMP6_FILTER_WILLPASS(type, filterp) \ |
| 136 | ((((filterp)->icmp6_filt[(type) >> 5]) & (1 << ((type) & 31))) == 0) |
| 137 | #define ICMP6_FILTER_WILLBLOCK(type, filterp) \ |
| 138 | ((((filterp)->icmp6_filt[(type) >> 5]) & (1 << ((type) & 31))) != 0) |
| 139 | #define ICMP6_FILTER_SETPASS(type, filterp) \ |
| 140 | ((((filterp)->icmp6_filt[(type) >> 5]) &= ~(1 << ((type) & 31)))) |
| 141 | #define ICMP6_FILTER_SETBLOCK(type, filterp) \ |
| 142 | ((((filterp)->icmp6_filt[(type) >> 5]) |= (1 << ((type) & 31)))) |
| 143 | #define ICMP6_FILTER_SETPASSALL(filterp) \ |
| 144 | memset(filterp, 0, sizeof(struct icmp6_filter)); |
| 145 | #define ICMP6_FILTER_SETBLOCKALL(filterp) \ |
| 146 | memset(filterp, 0xff, sizeof(struct icmp6_filter)); |
| 147 | #endif |
| 148 | |
| 149 | /* Support older systems with different defines */ |
| 150 | #if !defined(IPV6_RECVHOPLIMIT) && defined(IPV6_HOPLIMIT) |
| 151 | #define IPV6_RECVHOPLIMIT IPV6_HOPLIMIT |
| 152 | #endif |
| 153 | #if !defined(IPV6_RECVPKTINFO) && defined(IPV6_PKTINFO) |
| 154 | #define IPV6_RECVPKTINFO IPV6_PKTINFO |
| 155 | #endif |
| 156 | |
| 157 | static int |
| 158 | ipv6nd_open(struct dhcpcd_ctx *dctx) |
| 159 | { |
| 160 | struct ipv6_ctx *ctx; |
| 161 | int on; |
| 162 | struct icmp6_filter filt; |
| 163 | |
| 164 | ctx = dctx->ipv6; |
| 165 | if (ctx->nd_fd != -1) |
| 166 | return ctx->nd_fd; |
| 167 | #ifdef SOCK_CLOEXEC |
| 168 | ctx->nd_fd = socket(PF_INET6, SOCK_RAW | SOCK_CLOEXEC | SOCK_NONBLOCK, |
| 169 | IPPROTO_ICMPV6); |
| 170 | if (ctx->nd_fd == -1) |
| 171 | return -1; |
| 172 | #else |
| 173 | if ((ctx->nd_fd = socket(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) == -1) |
| 174 | return -1; |
| 175 | if ((on = fcntl(ctx->nd_fd, F_GETFD, 0)) == -1 || |
| 176 | fcntl(ctx->nd_fd, F_SETFD, on | FD_CLOEXEC) == -1) |
| 177 | { |
| 178 | close(ctx->nd_fd); |
| 179 | ctx->nd_fd = -1; |
| 180 | return -1; |
| 181 | } |
| 182 | if ((on = fcntl(ctx->nd_fd, F_GETFL, 0)) == -1 || |
| 183 | fcntl(ctx->nd_fd, F_SETFL, on | O_NONBLOCK) == -1) |
| 184 | { |
| 185 | close(ctx->nd_fd); |
| 186 | ctx->nd_fd = -1; |
| 187 | return -1; |
| 188 | } |
| 189 | #endif |
| 190 | |
| 191 | /* RFC4861 4.1 */ |
| 192 | on = 255; |
| 193 | if (setsockopt(ctx->nd_fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, |
| 194 | &on, sizeof(on)) == -1) |
| 195 | goto eexit; |
| 196 | |
| 197 | on = 1; |
| 198 | if (setsockopt(ctx->nd_fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, |
| 199 | &on, sizeof(on)) == -1) |
| 200 | goto eexit; |
| 201 | |
| 202 | on = 1; |
| 203 | if (setsockopt(ctx->nd_fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, |
| 204 | &on, sizeof(on)) == -1) |
| 205 | goto eexit; |
| 206 | |
| 207 | ICMP6_FILTER_SETBLOCKALL(&filt); |
| 208 | ICMP6_FILTER_SETPASS(ND_NEIGHBOR_ADVERT, &filt); |
| 209 | ICMP6_FILTER_SETPASS(ND_ROUTER_ADVERT, &filt); |
| 210 | if (setsockopt(ctx->nd_fd, IPPROTO_ICMPV6, ICMP6_FILTER, |
| 211 | &filt, sizeof(filt)) == -1) |
| 212 | goto eexit; |
| 213 | |
| 214 | eloop_event_add(dctx->eloop, ctx->nd_fd, |
| 215 | ipv6nd_handledata, dctx, NULL, NULL); |
| 216 | return ctx->nd_fd; |
| 217 | |
| 218 | eexit: |
| 219 | if (ctx->nd_fd != -1) { |
| 220 | eloop_event_delete(dctx->eloop, ctx->nd_fd, 0); |
| 221 | close(ctx->nd_fd); |
| 222 | ctx->nd_fd = -1; |
| 223 | } |
| 224 | return -1; |
| 225 | } |
| 226 | |
| 227 | static int |
| 228 | ipv6nd_makersprobe(struct interface *ifp) |
| 229 | { |
| 230 | struct rs_state *state; |
| 231 | struct nd_router_solicit *rs; |
| 232 | struct nd_opt_hdr *nd; |
| 233 | |
| 234 | state = RS_STATE(ifp); |
| 235 | free(state->rs); |
| 236 | state->rslen = sizeof(*rs) + (size_t)ROUNDUP8(ifp->hwlen + 2); |
| 237 | state->rs = calloc(1, state->rslen); |
| 238 | if (state->rs == NULL) |
| 239 | return -1; |
| 240 | rs = (struct nd_router_solicit *)(void *)state->rs; |
| 241 | rs->nd_rs_type = ND_ROUTER_SOLICIT; |
| 242 | rs->nd_rs_code = 0; |
| 243 | rs->nd_rs_cksum = 0; |
| 244 | rs->nd_rs_reserved = 0; |
| 245 | nd = (struct nd_opt_hdr *)(state->rs + sizeof(*rs)); |
| 246 | nd->nd_opt_type = ND_OPT_SOURCE_LINKADDR; |
| 247 | nd->nd_opt_len = (uint8_t)((ROUNDUP8(ifp->hwlen + 2)) >> 3); |
| 248 | memcpy(nd + 1, ifp->hwaddr, ifp->hwlen); |
| 249 | return 0; |
| 250 | } |
| 251 | |
| 252 | static void |
| 253 | ipv6nd_sendrsprobe(void *arg) |
| 254 | { |
| 255 | struct interface *ifp = arg; |
| 256 | struct ipv6_ctx *ctx; |
| 257 | struct rs_state *state; |
| 258 | struct sockaddr_in6 dst; |
| 259 | struct cmsghdr *cm; |
| 260 | struct in6_pktinfo pi; |
| 261 | |
| 262 | if (ipv6_linklocal(ifp) == NULL) { |
| 263 | logger(ifp->ctx, LOG_DEBUG, |
| 264 | "%s: delaying Router Solicitation for LL address", |
| 265 | ifp->name); |
| 266 | ipv6_addlinklocalcallback(ifp, ipv6nd_sendrsprobe, ifp); |
| 267 | return; |
| 268 | } |
| 269 | |
| 270 | memset(&dst, 0, sizeof(dst)); |
| 271 | dst.sin6_family = AF_INET6; |
| 272 | #ifdef SIN6_LEN |
| 273 | dst.sin6_len = sizeof(dst); |
| 274 | #endif |
| 275 | dst.sin6_scope_id = ifp->index; |
| 276 | if (inet_pton(AF_INET6, ALLROUTERS, &dst.sin6_addr) != 1) { |
| 277 | logger(ifp->ctx, LOG_ERR, "%s: %m", __func__); |
| 278 | return; |
| 279 | } |
| 280 | |
| 281 | state = RS_STATE(ifp); |
| 282 | ctx = ifp->ctx->ipv6; |
| 283 | ctx->sndhdr.msg_name = (void *)&dst; |
| 284 | ctx->sndhdr.msg_iov[0].iov_base = state->rs; |
| 285 | ctx->sndhdr.msg_iov[0].iov_len = state->rslen; |
| 286 | |
| 287 | /* Set the outbound interface */ |
| 288 | cm = CMSG_FIRSTHDR(&ctx->sndhdr); |
| 289 | if (cm == NULL) /* unlikely */ |
| 290 | return; |
| 291 | cm->cmsg_level = IPPROTO_IPV6; |
| 292 | cm->cmsg_type = IPV6_PKTINFO; |
| 293 | cm->cmsg_len = CMSG_LEN(sizeof(pi)); |
| 294 | memset(&pi, 0, sizeof(pi)); |
| 295 | pi.ipi6_ifindex = ifp->index; |
| 296 | memcpy(CMSG_DATA(cm), &pi, sizeof(pi)); |
| 297 | |
| 298 | logger(ifp->ctx, LOG_DEBUG, |
| 299 | "%s: sending Router Solicitation", ifp->name); |
| 300 | if (sendmsg(ctx->nd_fd, &ctx->sndhdr, 0) == -1) { |
| 301 | logger(ifp->ctx, LOG_ERR, |
| 302 | "%s: %s: sendmsg: %m", ifp->name, __func__); |
| 303 | ipv6nd_drop(ifp); |
| 304 | ifp->options->options &= ~(DHCPCD_IPV6 | DHCPCD_IPV6RS); |
| 305 | return; |
| 306 | } |
| 307 | |
| 308 | if (state->rsprobes++ < MAX_RTR_SOLICITATIONS) |
| 309 | eloop_timeout_add_sec(ifp->ctx->eloop, |
| 310 | RTR_SOLICITATION_INTERVAL, ipv6nd_sendrsprobe, ifp); |
| 311 | else { |
| 312 | logger(ifp->ctx, LOG_WARNING, |
| 313 | "%s: no IPv6 Routers available", ifp->name); |
| 314 | ipv6nd_drop(ifp); |
| 315 | dhcp6_drop(ifp, "EXPIRE6"); |
| 316 | } |
| 317 | } |
| 318 | |
| 319 | void |
| 320 | ipv6nd_expire(struct interface *ifp, uint32_t seconds) |
| 321 | { |
| 322 | struct ra *rap; |
| 323 | struct timespec now; |
| 324 | |
| 325 | get_monotonic(&now); |
| 326 | |
| 327 | TAILQ_FOREACH(rap, ifp->ctx->ipv6->ra_routers, next) { |
| 328 | if (rap->iface == ifp) { |
| 329 | rap->received = now; |
| 330 | rap->expired = seconds ? 0 : 1; |
| 331 | if (seconds) { |
| 332 | struct ra_opt *rao; |
| 333 | struct ipv6_addr *ap; |
| 334 | |
| 335 | rap->lifetime = seconds; |
| 336 | TAILQ_FOREACH(ap, &rap->addrs, next) { |
| 337 | if (ap->prefix_vltime) { |
| 338 | ap->prefix_vltime = seconds; |
| 339 | ap->prefix_pltime = seconds / 2; |
| 340 | } |
| 341 | } |
| 342 | ipv6_addaddrs(&rap->addrs); |
| 343 | TAILQ_FOREACH(rao, &rap->options, next) { |
| 344 | timespecclear(&rao->expire); |
| 345 | } |
| 346 | } |
| 347 | } |
| 348 | } |
| 349 | if (seconds) |
| 350 | ipv6nd_expirera(ifp); |
| 351 | else |
| 352 | ipv6_buildroutes(ifp->ctx); |
| 353 | } |
| 354 | |
| 355 | static void |
| 356 | ipv6nd_reachable(struct ra *rap, int flags) |
| 357 | { |
| 358 | |
| 359 | if (flags & IPV6ND_REACHABLE) { |
| 360 | if (rap->lifetime && rap->expired) { |
| 361 | logger(rap->iface->ctx, LOG_INFO, |
| 362 | "%s: %s is reachable again", |
| 363 | rap->iface->name, rap->sfrom); |
| 364 | rap->expired = 0; |
| 365 | ipv6_buildroutes(rap->iface->ctx); |
| 366 | /* XXX Not really an RA */ |
| 367 | script_runreason(rap->iface, "ROUTERADVERT"); |
| 368 | } |
| 369 | } else { |
| 370 | if (rap->lifetime && !rap->expired) { |
| 371 | logger(rap->iface->ctx, LOG_WARNING, |
| 372 | "%s: %s is unreachable, expiring it", |
| 373 | rap->iface->name, rap->sfrom); |
| 374 | rap->expired = 1; |
| 375 | ipv6_buildroutes(rap->iface->ctx); |
| 376 | /* XXX Not really an RA */ |
| 377 | script_runreason(rap->iface, "ROUTERADVERT"); |
| 378 | } |
| 379 | } |
| 380 | } |
| 381 | |
| 382 | void |
| 383 | ipv6nd_neighbour(struct dhcpcd_ctx *ctx, struct in6_addr *addr, int flags) |
| 384 | { |
| 385 | struct ra *rap; |
| 386 | |
| 387 | if (ctx->ipv6) { |
| 388 | TAILQ_FOREACH(rap, ctx->ipv6->ra_routers, next) { |
| 389 | if (IN6_ARE_ADDR_EQUAL(&rap->from, addr)) { |
| 390 | ipv6nd_reachable(rap, flags); |
| 391 | break; |
| 392 | } |
| 393 | } |
| 394 | } |
| 395 | } |
| 396 | |
| 397 | static void |
| 398 | ipv6nd_free_opts(struct ra *rap) |
| 399 | { |
| 400 | struct ra_opt *rao; |
| 401 | |
| 402 | while ((rao = TAILQ_FIRST(&rap->options))) { |
| 403 | TAILQ_REMOVE(&rap->options, rao, next); |
| 404 | free(rao->option); |
| 405 | free(rao); |
| 406 | } |
| 407 | } |
| 408 | |
| 409 | struct ipv6_addr * |
| 410 | ipv6nd_findaddr(struct dhcpcd_ctx *ctx, const struct in6_addr *addr, |
| 411 | short flags) |
| 412 | { |
| 413 | struct ra *rap; |
| 414 | struct ipv6_addr *ap; |
| 415 | |
| 416 | if (ctx->ipv6 == NULL) |
| 417 | return NULL; |
| 418 | |
| 419 | TAILQ_FOREACH(rap, ctx->ipv6->ra_routers, next) { |
| 420 | TAILQ_FOREACH(ap, &rap->addrs, next) { |
| 421 | if (addr == NULL) { |
| 422 | if ((ap->flags & |
| 423 | (IPV6_AF_ADDED | IPV6_AF_DADCOMPLETED)) == |
| 424 | (IPV6_AF_ADDED | IPV6_AF_DADCOMPLETED)) |
| 425 | return ap; |
| 426 | } else if (ap->prefix_vltime && |
| 427 | IN6_ARE_ADDR_EQUAL(&ap->addr, addr) && |
| 428 | (!flags || ap->flags & flags)) |
| 429 | return ap; |
| 430 | } |
| 431 | } |
| 432 | return NULL; |
| 433 | } |
| 434 | |
| 435 | void ipv6nd_freedrop_ra(struct ra *rap, int drop) |
| 436 | { |
| 437 | |
| 438 | eloop_timeout_delete(rap->iface->ctx->eloop, NULL, rap->iface); |
| 439 | eloop_timeout_delete(rap->iface->ctx->eloop, NULL, rap); |
| 440 | if (!drop) |
| 441 | TAILQ_REMOVE(rap->iface->ctx->ipv6->ra_routers, rap, next); |
| 442 | ipv6_freedrop_addrs(&rap->addrs, drop, NULL); |
| 443 | ipv6nd_free_opts(rap); |
| 444 | free(rap->data); |
| 445 | free(rap); |
| 446 | } |
| 447 | |
| 448 | ssize_t |
| 449 | ipv6nd_free(struct interface *ifp) |
| 450 | { |
| 451 | struct rs_state *state; |
| 452 | struct ra *rap, *ran; |
| 453 | struct dhcpcd_ctx *ctx; |
| 454 | ssize_t n; |
| 455 | |
| 456 | state = RS_STATE(ifp); |
| 457 | if (state == NULL) |
| 458 | return 0; |
| 459 | |
| 460 | free(state->rs); |
| 461 | free(state); |
| 462 | ifp->if_data[IF_DATA_IPV6ND] = NULL; |
| 463 | n = 0; |
| 464 | TAILQ_FOREACH_SAFE(rap, ifp->ctx->ipv6->ra_routers, next, ran) { |
| 465 | if (rap->iface == ifp) { |
| 466 | ipv6nd_free_ra(rap); |
| 467 | n++; |
| 468 | } |
| 469 | } |
| 470 | |
| 471 | /* If we don't have any more IPv6 enabled interfaces, |
| 472 | * close the global socket and release resources */ |
| 473 | ctx = ifp->ctx; |
| 474 | TAILQ_FOREACH(ifp, ctx->ifaces, next) { |
| 475 | if (RS_STATE(ifp)) |
| 476 | break; |
| 477 | } |
| 478 | if (ifp == NULL) { |
| 479 | if (ctx->ipv6->nd_fd != -1) { |
| 480 | eloop_event_delete(ctx->eloop, ctx->ipv6->nd_fd, 0); |
| 481 | close(ctx->ipv6->nd_fd); |
| 482 | ctx->ipv6->nd_fd = -1; |
| 483 | } |
| 484 | } |
| 485 | |
| 486 | return n; |
| 487 | } |
| 488 | |
| 489 | static int |
| 490 | rtpref(struct ra *rap) |
| 491 | { |
| 492 | |
| 493 | switch (rap->flags & ND_RA_FLAG_RTPREF_MASK) { |
| 494 | case ND_RA_FLAG_RTPREF_HIGH: |
| 495 | return (RTPREF_HIGH); |
| 496 | case ND_RA_FLAG_RTPREF_MEDIUM: |
| 497 | case ND_RA_FLAG_RTPREF_RSV: |
| 498 | return (RTPREF_MEDIUM); |
| 499 | case ND_RA_FLAG_RTPREF_LOW: |
| 500 | return (RTPREF_LOW); |
| 501 | default: |
| 502 | logger(rap->iface->ctx, LOG_ERR, |
| 503 | "rtpref: impossible RA flag %x", rap->flags); |
| 504 | return (RTPREF_INVALID); |
| 505 | } |
| 506 | /* NOTREACHED */ |
| 507 | } |
| 508 | |
| 509 | static void |
| 510 | add_router(struct ipv6_ctx *ctx, struct ra *router) |
| 511 | { |
| 512 | struct ra *rap; |
| 513 | |
| 514 | TAILQ_FOREACH(rap, ctx->ra_routers, next) { |
| 515 | if (router->iface->metric < rap->iface->metric || |
| 516 | (router->iface->metric == rap->iface->metric && |
| 517 | rtpref(router) > rtpref(rap))) |
| 518 | { |
| 519 | TAILQ_INSERT_BEFORE(rap, router, next); |
| 520 | return; |
| 521 | } |
| 522 | } |
| 523 | TAILQ_INSERT_TAIL(ctx->ra_routers, router, next); |
| 524 | } |
| 525 | |
| 526 | static int |
| 527 | ipv6nd_scriptrun(struct ra *rap) |
| 528 | { |
| 529 | int hasdns, hasaddress, pid; |
| 530 | struct ipv6_addr *ap; |
| 531 | const struct ra_opt *rao; |
| 532 | |
| 533 | hasaddress = 0; |
| 534 | /* If all addresses have completed DAD run the script */ |
| 535 | TAILQ_FOREACH(ap, &rap->addrs, next) { |
| 536 | if ((ap->flags & (IPV6_AF_AUTOCONF | IPV6_AF_ADDED)) == |
| 537 | (IPV6_AF_AUTOCONF | IPV6_AF_ADDED)) |
| 538 | { |
| 539 | hasaddress = 1; |
| 540 | if (!(ap->flags & IPV6_AF_DADCOMPLETED) && |
| 541 | ipv6_iffindaddr(ap->iface, &ap->addr)) |
| 542 | ap->flags |= IPV6_AF_DADCOMPLETED; |
| 543 | if ((ap->flags & IPV6_AF_DADCOMPLETED) == 0) { |
| 544 | logger(ap->iface->ctx, LOG_DEBUG, |
| 545 | "%s: waiting for Router Advertisement" |
| 546 | " DAD to complete", |
| 547 | rap->iface->name); |
| 548 | return 0; |
| 549 | } |
| 550 | } |
| 551 | } |
| 552 | |
| 553 | /* If we don't require RDNSS then set hasdns = 1 so we fork */ |
| 554 | if (!(rap->iface->options->options & DHCPCD_IPV6RA_REQRDNSS)) |
| 555 | hasdns = 1; |
| 556 | else { |
| 557 | hasdns = 0; |
| 558 | TAILQ_FOREACH(rao, &rap->options, next) { |
| 559 | if (rao->type == ND_OPT_RDNSS && |
| 560 | rao->option && |
| 561 | timespecisset(&rao->expire)) |
| 562 | { |
| 563 | hasdns = 1; |
| 564 | break; |
| 565 | } |
| 566 | } |
| 567 | } |
| 568 | |
| 569 | script_runreason(rap->iface, "ROUTERADVERT"); |
| 570 | pid = 0; |
| 571 | if (hasdns && (hasaddress || |
| 572 | !(rap->flags & (ND_RA_FLAG_MANAGED | ND_RA_FLAG_OTHER)))) |
| 573 | pid = dhcpcd_daemonise(rap->iface->ctx); |
| 574 | #if 0 |
| 575 | else if (options & DHCPCD_DAEMONISE && |
| 576 | !(options & DHCPCD_DAEMONISED) && new_data) |
| 577 | logger(rap->iface->ctx, LOG_WARNING, |
| 578 | "%s: did not fork due to an absent" |
| 579 | " RDNSS option in the RA", |
| 580 | ifp->name); |
| 581 | } |
| 582 | #endif |
| 583 | return pid; |
| 584 | } |
| 585 | |
| 586 | static void |
| 587 | ipv6nd_addaddr(void *arg) |
| 588 | { |
| 589 | struct ipv6_addr *ap = arg; |
| 590 | |
| 591 | ipv6_addaddr(ap, NULL); |
| 592 | } |
| 593 | |
| 594 | int |
| 595 | ipv6nd_dadcompleted(const struct interface *ifp) |
| 596 | { |
| 597 | const struct ra *rap; |
| 598 | const struct ipv6_addr *ap; |
| 599 | |
| 600 | TAILQ_FOREACH(rap, ifp->ctx->ipv6->ra_routers, next) { |
| 601 | if (rap->iface != ifp) |
| 602 | continue; |
| 603 | TAILQ_FOREACH(ap, &rap->addrs, next) { |
| 604 | if (ap->flags & IPV6_AF_AUTOCONF && |
| 605 | ap->flags & IPV6_AF_ADDED && |
| 606 | !(ap->flags & IPV6_AF_DADCOMPLETED)) |
| 607 | return 0; |
| 608 | } |
| 609 | } |
| 610 | return 1; |
| 611 | } |
| 612 | |
| 613 | static void |
| 614 | ipv6nd_dadcallback(void *arg) |
| 615 | { |
| 616 | struct ipv6_addr *ap = arg, *rapap; |
| 617 | struct interface *ifp; |
| 618 | struct ra *rap; |
| 619 | int wascompleted, found; |
| 620 | struct timespec tv; |
| 621 | char buf[INET6_ADDRSTRLEN]; |
| 622 | const char *p; |
| 623 | int dadcounter; |
| 624 | |
| 625 | ifp = ap->iface; |
| 626 | wascompleted = (ap->flags & IPV6_AF_DADCOMPLETED); |
| 627 | ap->flags |= IPV6_AF_DADCOMPLETED; |
| 628 | if (ap->flags & IPV6_AF_DUPLICATED) { |
| 629 | ap->dadcounter++; |
| 630 | logger(ifp->ctx, LOG_WARNING, "%s: DAD detected %s", |
| 631 | ifp->name, ap->saddr); |
| 632 | |
| 633 | /* Try and make another stable private address. |
| 634 | * Because ap->dadcounter is always increamented, |
| 635 | * a different address is generated. */ |
| 636 | /* XXX Cache DAD counter per prefix/id/ssid? */ |
| 637 | if (ifp->options->options & DHCPCD_SLAACPRIVATE) { |
| 638 | if (ap->dadcounter >= IDGEN_RETRIES) { |
| 639 | logger(ifp->ctx, LOG_ERR, |
| 640 | "%s: unable to obtain a" |
| 641 | " stable private address", |
| 642 | ifp->name); |
| 643 | goto try_script; |
| 644 | } |
| 645 | logger(ifp->ctx, LOG_INFO, "%s: deleting address %s", |
| 646 | ifp->name, ap->saddr); |
| 647 | if (if_deladdress6(ap) == -1 && |
| 648 | errno != EADDRNOTAVAIL && errno != ENXIO) |
| 649 | logger(ifp->ctx, LOG_ERR, "if_deladdress6: %m"); |
| 650 | dadcounter = ap->dadcounter; |
| 651 | if (ipv6_makestableprivate(&ap->addr, |
| 652 | &ap->prefix, ap->prefix_len, |
| 653 | ifp, &dadcounter) == -1) |
| 654 | { |
| 655 | logger(ifp->ctx, LOG_ERR, |
| 656 | "%s: ipv6_makestableprivate: %m", |
| 657 | ifp->name); |
| 658 | return; |
| 659 | } |
| 660 | ap->dadcounter = dadcounter; |
| 661 | ap->flags &= ~(IPV6_AF_ADDED | IPV6_AF_DADCOMPLETED); |
| 662 | ap->flags |= IPV6_AF_NEW; |
| 663 | p = inet_ntop(AF_INET6, &ap->addr, buf, sizeof(buf)); |
| 664 | if (p) |
| 665 | snprintf(ap->saddr, |
| 666 | sizeof(ap->saddr), |
| 667 | "%s/%d", |
| 668 | p, ap->prefix_len); |
| 669 | else |
| 670 | ap->saddr[0] = '\0'; |
| 671 | tv.tv_sec = 0; |
| 672 | tv.tv_nsec = (suseconds_t) |
| 673 | arc4random_uniform(IDGEN_DELAY * NSEC_PER_SEC); |
| 674 | timespecnorm(&tv); |
| 675 | eloop_timeout_add_tv(ifp->ctx->eloop, &tv, |
| 676 | ipv6nd_addaddr, ap); |
| 677 | return; |
| 678 | } |
| 679 | } |
| 680 | |
| 681 | try_script: |
| 682 | if (!wascompleted) { |
| 683 | TAILQ_FOREACH(rap, ifp->ctx->ipv6->ra_routers, next) { |
| 684 | if (rap->iface != ifp) |
| 685 | continue; |
| 686 | wascompleted = 1; |
| 687 | found = 0; |
| 688 | TAILQ_FOREACH(rapap, &rap->addrs, next) { |
| 689 | if (rapap->flags & IPV6_AF_AUTOCONF && |
| 690 | rapap->flags & IPV6_AF_ADDED && |
| 691 | (rapap->flags & IPV6_AF_DADCOMPLETED) == 0) |
| 692 | { |
| 693 | wascompleted = 0; |
| 694 | break; |
| 695 | } |
| 696 | if (rapap == ap) |
| 697 | found = 1; |
| 698 | } |
| 699 | |
| 700 | if (wascompleted && found) { |
| 701 | logger(rap->iface->ctx, LOG_DEBUG, |
| 702 | "%s: Router Advertisement DAD completed", |
| 703 | rap->iface->name); |
| 704 | if (ipv6nd_scriptrun(rap)) |
| 705 | return; |
| 706 | } |
| 707 | } |
| 708 | } |
| 709 | } |
| 710 | |
| 711 | static int |
| 712 | ipv6nd_ra_has_public_addr(const struct ra *rap) |
| 713 | { |
| 714 | const struct ipv6_addr *ia; |
| 715 | |
| 716 | TAILQ_FOREACH(ia, &rap->addrs, next) { |
| 717 | if (ia->flags & IPV6_AF_AUTOCONF && |
| 718 | ipv6_publicaddr(ia)) |
| 719 | return 1; |
| 720 | } |
| 721 | return 0; |
| 722 | } |
| 723 | |
| 724 | static void |
| 725 | ipv6nd_handlera(struct dhcpcd_ctx *dctx, struct interface *ifp, |
| 726 | struct icmp6_hdr *icp, size_t len) |
| 727 | { |
| 728 | struct ipv6_ctx *ctx = dctx->ipv6; |
| 729 | size_t olen, l, n; |
| 730 | ssize_t r; |
| 731 | struct nd_router_advert *nd_ra; |
| 732 | struct nd_opt_prefix_info *pi; |
| 733 | struct nd_opt_mtu *mtu; |
| 734 | struct nd_opt_rdnss *rdnss; |
| 735 | struct nd_opt_dnssl *dnssl; |
| 736 | uint32_t lifetime, mtuv; |
| 737 | uint8_t *p, *op; |
| 738 | struct in6_addr addr; |
| 739 | char buf[INET6_ADDRSTRLEN]; |
| 740 | const char *cbp; |
| 741 | struct ra *rap; |
| 742 | struct nd_opt_hdr *ndo; |
| 743 | struct ra_opt *rao; |
| 744 | struct ipv6_addr *ap; |
| 745 | char *opt, *opt2, *tmp; |
| 746 | struct timespec expire; |
| 747 | uint8_t new_rap, new_data; |
| 748 | #ifdef IPV6_MANAGETEMPADDR |
| 749 | uint8_t new_ap; |
| 750 | #endif |
| 751 | |
| 752 | if (len < sizeof(struct nd_router_advert)) { |
| 753 | logger(dctx, LOG_ERR, |
| 754 | "IPv6 RA packet too short from %s", ctx->sfrom); |
| 755 | return; |
| 756 | } |
| 757 | |
| 758 | if (!IN6_IS_ADDR_LINKLOCAL(&ctx->from.sin6_addr)) { |
| 759 | logger(dctx, LOG_ERR, |
| 760 | "RA from non local address %s", ctx->sfrom); |
| 761 | return; |
| 762 | } |
| 763 | |
| 764 | if (ifp == NULL) { |
| 765 | #ifdef DEBUG_RS |
| 766 | logger(dctx, LOG_DEBUG, |
| 767 | "RA for unexpected interface from %s", ctx->sfrom); |
| 768 | #endif |
| 769 | return; |
| 770 | } |
| 771 | if (!(ifp->options->options & DHCPCD_IPV6RS)) { |
| 772 | #ifdef DEBUG_RS |
| 773 | logger(ifp->ctx, LOG_DEBUG, "%s: unexpected RA from %s", |
| 774 | ifp->name, ctx->sfrom); |
| 775 | #endif |
| 776 | return; |
| 777 | } |
| 778 | |
| 779 | /* We could receive a RA before we sent a RS*/ |
| 780 | if (ipv6_linklocal(ifp) == NULL) { |
| 781 | #ifdef DEBUG_RS |
| 782 | logger(ifp->ctx, LOG_DEBUG, |
| 783 | "%s: received RA from %s (no link-local)", |
| 784 | ifp->name, ctx->sfrom); |
| 785 | #endif |
| 786 | return; |
| 787 | } |
| 788 | |
| 789 | if (ipv6_iffindaddr(ifp, &ctx->from.sin6_addr)) { |
| 790 | logger(ifp->ctx, LOG_DEBUG, |
| 791 | "%s: ignoring RA from ourself %s", ifp->name, ctx->sfrom); |
| 792 | return; |
| 793 | } |
| 794 | |
| 795 | TAILQ_FOREACH(rap, ctx->ra_routers, next) { |
| 796 | if (ifp == rap->iface && |
| 797 | IN6_ARE_ADDR_EQUAL(&rap->from, &ctx->from.sin6_addr)) |
| 798 | break; |
| 799 | } |
| 800 | |
| 801 | nd_ra = (struct nd_router_advert *)icp; |
| 802 | |
| 803 | /* We don't want to spam the log with the fact we got an RA every |
| 804 | * 30 seconds or so, so only spam the log if it's different. */ |
| 805 | if (rap == NULL || (rap->data_len != len || |
| 806 | memcmp(rap->data, (unsigned char *)icp, rap->data_len) != 0)) |
| 807 | { |
| 808 | if (rap) { |
| 809 | free(rap->data); |
| 810 | rap->data_len = 0; |
| 811 | rap->no_public_warned = 0; |
| 812 | } |
| 813 | new_data = 1; |
| 814 | } else |
| 815 | new_data = 0; |
| 816 | if (new_data || ifp->options->options & DHCPCD_DEBUG) |
| 817 | logger(ifp->ctx, LOG_INFO, "%s: Router Advertisement from %s", |
| 818 | ifp->name, ctx->sfrom); |
| 819 | |
| 820 | if (rap == NULL) { |
| 821 | rap = calloc(1, sizeof(*rap)); |
| 822 | if (rap == NULL) { |
| 823 | logger(ifp->ctx, LOG_ERR, "%s: %m", __func__); |
| 824 | return; |
| 825 | } |
| 826 | rap->iface = ifp; |
| 827 | rap->from = ctx->from.sin6_addr; |
| 828 | strlcpy(rap->sfrom, ctx->sfrom, sizeof(rap->sfrom)); |
| 829 | TAILQ_INIT(&rap->addrs); |
| 830 | TAILQ_INIT(&rap->options); |
| 831 | new_rap = 1; |
| 832 | } else |
| 833 | new_rap = 0; |
| 834 | if (rap->data_len == 0) { |
| 835 | rap->data = malloc(len); |
| 836 | if (rap->data == NULL) { |
| 837 | logger(ifp->ctx, LOG_ERR, "%s: %m", __func__); |
| 838 | if (new_rap) |
| 839 | free(rap); |
| 840 | return; |
| 841 | } |
| 842 | memcpy(rap->data, icp, len); |
| 843 | rap->data_len = len; |
| 844 | } |
| 845 | |
| 846 | get_monotonic(&rap->received); |
| 847 | rap->flags = nd_ra->nd_ra_flags_reserved; |
| 848 | if (new_rap == 0 && rap->lifetime == 0) |
| 849 | logger(ifp->ctx, LOG_WARNING, "%s: %s router available", |
| 850 | ifp->name, rap->sfrom); |
| 851 | rap->lifetime = ntohs(nd_ra->nd_ra_router_lifetime); |
| 852 | if (nd_ra->nd_ra_reachable) { |
| 853 | rap->reachable = ntohl(nd_ra->nd_ra_reachable); |
| 854 | if (rap->reachable > MAX_REACHABLE_TIME) |
| 855 | rap->reachable = 0; |
| 856 | } |
| 857 | if (nd_ra->nd_ra_retransmit) |
| 858 | rap->retrans = ntohl(nd_ra->nd_ra_retransmit); |
| 859 | if (rap->lifetime) |
| 860 | rap->expired = 0; |
| 861 | |
| 862 | ipv6_settempstale(ifp); |
| 863 | TAILQ_FOREACH(ap, &rap->addrs, next) { |
| 864 | ap->flags |= IPV6_AF_STALE; |
| 865 | } |
| 866 | |
| 867 | len -= sizeof(struct nd_router_advert); |
| 868 | p = ((uint8_t *)icp) + sizeof(struct nd_router_advert); |
| 869 | lifetime = ~0U; |
| 870 | for (; len > 0; p += olen, len -= olen) { |
| 871 | if (len < sizeof(struct nd_opt_hdr)) { |
| 872 | logger(ifp->ctx, LOG_ERR, |
| 873 | "%s: short option", ifp->name); |
| 874 | break; |
| 875 | } |
| 876 | ndo = (struct nd_opt_hdr *)p; |
| 877 | olen = (size_t)ndo->nd_opt_len * 8; |
| 878 | if (olen == 0) { |
| 879 | logger(ifp->ctx, LOG_ERR, |
| 880 | "%s: zero length option", ifp->name); |
| 881 | break; |
| 882 | } |
| 883 | if (olen > len) { |
| 884 | logger(ifp->ctx, LOG_ERR, |
| 885 | "%s: option length exceeds message", ifp->name); |
| 886 | break; |
| 887 | } |
| 888 | |
| 889 | opt = opt2 = NULL; |
| 890 | switch (ndo->nd_opt_type) { |
| 891 | case ND_OPT_PREFIX_INFORMATION: |
| 892 | pi = (struct nd_opt_prefix_info *)(void *)ndo; |
| 893 | if (pi->nd_opt_pi_len != 4) { |
| 894 | logger(ifp->ctx, new_data ? LOG_ERR : LOG_DEBUG, |
| 895 | "%s: invalid option len for prefix", |
| 896 | ifp->name); |
| 897 | continue; |
| 898 | } |
| 899 | if (pi->nd_opt_pi_prefix_len > 128) { |
| 900 | logger(ifp->ctx, new_data ? LOG_ERR : LOG_DEBUG, |
| 901 | "%s: invalid prefix len", |
| 902 | ifp->name); |
| 903 | continue; |
| 904 | } |
| 905 | if (IN6_IS_ADDR_MULTICAST(&pi->nd_opt_pi_prefix) || |
| 906 | IN6_IS_ADDR_LINKLOCAL(&pi->nd_opt_pi_prefix)) |
| 907 | { |
| 908 | logger(ifp->ctx, new_data ? LOG_ERR : LOG_DEBUG, |
| 909 | "%s: invalid prefix in RA", ifp->name); |
| 910 | continue; |
| 911 | } |
| 912 | if (ntohl(pi->nd_opt_pi_preferred_time) > |
| 913 | ntohl(pi->nd_opt_pi_valid_time)) |
| 914 | { |
| 915 | logger(ifp->ctx, new_data ? LOG_ERR : LOG_DEBUG, |
| 916 | "%s: pltime > vltime", ifp->name); |
| 917 | continue; |
| 918 | } |
| 919 | TAILQ_FOREACH(ap, &rap->addrs, next) |
| 920 | if (ap->prefix_len ==pi->nd_opt_pi_prefix_len && |
| 921 | IN6_ARE_ADDR_EQUAL(&ap->prefix, |
| 922 | &pi->nd_opt_pi_prefix)) |
| 923 | break; |
| 924 | if (ap == NULL) { |
| 925 | if (!(pi->nd_opt_pi_flags_reserved & |
| 926 | ND_OPT_PI_FLAG_AUTO) && |
| 927 | !(pi->nd_opt_pi_flags_reserved & |
| 928 | ND_OPT_PI_FLAG_ONLINK)) |
| 929 | continue; |
| 930 | ap = calloc(1, sizeof(*ap)); |
| 931 | if (ap == NULL) |
| 932 | break; |
| 933 | ap->iface = rap->iface; |
| 934 | ap->flags = IPV6_AF_NEW; |
| 935 | ap->prefix_len = pi->nd_opt_pi_prefix_len; |
| 936 | ap->prefix = pi->nd_opt_pi_prefix; |
| 937 | if (pi->nd_opt_pi_flags_reserved & |
| 938 | ND_OPT_PI_FLAG_AUTO && |
| 939 | ap->iface->options->options & |
| 940 | DHCPCD_IPV6RA_AUTOCONF) |
| 941 | { |
| 942 | ap->flags |= IPV6_AF_AUTOCONF; |
| 943 | ap->dadcounter = |
| 944 | ipv6_makeaddr(&ap->addr, ifp, |
| 945 | &ap->prefix, |
| 946 | pi->nd_opt_pi_prefix_len); |
| 947 | if (ap->dadcounter == -1) { |
| 948 | free(ap); |
| 949 | break; |
| 950 | } |
| 951 | cbp = inet_ntop(AF_INET6, |
| 952 | &ap->addr, |
| 953 | buf, sizeof(buf)); |
| 954 | if (cbp) |
| 955 | snprintf(ap->saddr, |
| 956 | sizeof(ap->saddr), |
| 957 | "%s/%d", |
| 958 | cbp, ap->prefix_len); |
| 959 | else |
| 960 | ap->saddr[0] = '\0'; |
| 961 | } else { |
| 962 | memset(&ap->addr, 0, sizeof(ap->addr)); |
| 963 | ap->saddr[0] = '\0'; |
| 964 | } |
| 965 | ap->dadcallback = ipv6nd_dadcallback; |
| 966 | ap->created = ap->acquired = rap->received; |
| 967 | TAILQ_INSERT_TAIL(&rap->addrs, ap, next); |
| 968 | |
| 969 | #ifdef IPV6_MANAGETEMPADDR |
| 970 | /* New address to dhcpcd RA handling. |
| 971 | * If the address already exists and a valid |
| 972 | * temporary address also exists then |
| 973 | * extend the existing one rather than |
| 974 | * create a new one */ |
| 975 | if (ipv6_iffindaddr(ifp, &ap->addr) && |
| 976 | ipv6_settemptime(ap, 0)) |
| 977 | new_ap = 0; |
| 978 | else |
| 979 | new_ap = 1; |
| 980 | #endif |
| 981 | } else { |
| 982 | #ifdef IPV6_MANAGETEMPADDR |
| 983 | new_ap = 0; |
| 984 | #endif |
| 985 | ap->flags &= ~IPV6_AF_STALE; |
| 986 | ap->acquired = rap->received; |
| 987 | } |
| 988 | if (pi->nd_opt_pi_flags_reserved & |
| 989 | ND_OPT_PI_FLAG_ONLINK) |
| 990 | ap->flags |= IPV6_AF_ONLINK; |
| 991 | ap->prefix_vltime = |
| 992 | ntohl(pi->nd_opt_pi_valid_time); |
| 993 | ap->prefix_pltime = |
| 994 | ntohl(pi->nd_opt_pi_preferred_time); |
| 995 | ap->nsprobes = 0; |
| 996 | cbp = inet_ntop(AF_INET6, &ap->prefix, buf, sizeof(buf)); |
| 997 | if (cbp) { |
| 998 | l = strlen(cbp); |
| 999 | opt = malloc(l + 5); |
| 1000 | if (opt) { |
| 1001 | snprintf(opt, l + 5, "%s/%d", cbp, |
| 1002 | ap->prefix_len); |
| 1003 | opt2 = strdup(ap->saddr); |
| 1004 | } |
| 1005 | } |
| 1006 | |
| 1007 | #ifdef IPV6_MANAGETEMPADDR |
| 1008 | /* RFC4941 Section 3.3.3 */ |
| 1009 | if (ap->flags & IPV6_AF_AUTOCONF && |
| 1010 | ap->iface->options->options & DHCPCD_IPV6RA_OWN && |
| 1011 | ip6_use_tempaddr(ap->iface->name)) |
| 1012 | { |
| 1013 | if (!new_ap) { |
| 1014 | if (ipv6_settemptime(ap, 1) == NULL) |
| 1015 | new_ap = 1; |
| 1016 | } |
| 1017 | if (new_ap && ap->prefix_pltime) { |
| 1018 | if (ipv6_createtempaddr(ap, |
| 1019 | &ap->acquired) == NULL) |
| 1020 | logger(ap->iface->ctx, LOG_ERR, |
| 1021 | "ipv6_createtempaddr: %m"); |
| 1022 | } |
| 1023 | } |
| 1024 | #endif |
| 1025 | |
| 1026 | lifetime = ap->prefix_vltime; |
| 1027 | break; |
| 1028 | |
| 1029 | case ND_OPT_MTU: |
| 1030 | mtu = (struct nd_opt_mtu *)(void *)p; |
| 1031 | mtuv = ntohl(mtu->nd_opt_mtu_mtu); |
| 1032 | if (mtuv < IPV6_MMTU) { |
| 1033 | logger(ifp->ctx, LOG_ERR, "%s: invalid MTU %d", |
| 1034 | ifp->name, mtuv); |
| 1035 | break; |
| 1036 | } |
| 1037 | rap->mtu = mtuv; |
| 1038 | snprintf(buf, sizeof(buf), "%d", mtuv); |
| 1039 | opt = strdup(buf); |
| 1040 | break; |
| 1041 | |
| 1042 | case ND_OPT_RDNSS: |
| 1043 | rdnss = (struct nd_opt_rdnss *)p; |
| 1044 | lifetime = ntohl(rdnss->nd_opt_rdnss_lifetime); |
| 1045 | op = (uint8_t *)ndo; |
| 1046 | op += offsetof(struct nd_opt_rdnss, |
| 1047 | nd_opt_rdnss_lifetime); |
| 1048 | op += sizeof(rdnss->nd_opt_rdnss_lifetime); |
| 1049 | l = 0; |
| 1050 | for (n = (size_t)ndo->nd_opt_len - 1; n > 1; n -= 2, |
| 1051 | op += sizeof(addr)) |
| 1052 | { |
| 1053 | r = ipv6_printaddr(NULL, 0, op, ifp->name); |
| 1054 | if (r != -1) |
| 1055 | l += (size_t)r + 1; |
| 1056 | } |
| 1057 | op = (uint8_t *)ndo; |
| 1058 | op += offsetof(struct nd_opt_rdnss, |
| 1059 | nd_opt_rdnss_lifetime); |
| 1060 | op += sizeof(rdnss->nd_opt_rdnss_lifetime); |
| 1061 | tmp = opt = malloc(l); |
| 1062 | if (opt == NULL) |
| 1063 | continue; |
| 1064 | for (n = (size_t)ndo->nd_opt_len - 1; n > 1; n -= 2, |
| 1065 | op += sizeof(addr)) |
| 1066 | { |
| 1067 | r = ipv6_printaddr(tmp, l, op, |
| 1068 | ifp->name); |
| 1069 | if (r != -1) { |
| 1070 | l -= ((size_t)r + 1); |
| 1071 | tmp += (size_t)r; |
| 1072 | *tmp++ = ' '; |
| 1073 | } |
| 1074 | } |
| 1075 | if (tmp != opt) |
| 1076 | (*--tmp) = '\0'; |
| 1077 | else |
| 1078 | *opt = '\0'; |
| 1079 | break; |
| 1080 | |
| 1081 | case ND_OPT_DNSSL: |
| 1082 | dnssl = (struct nd_opt_dnssl *)p; |
| 1083 | lifetime = ntohl(dnssl->nd_opt_dnssl_lifetime); |
| 1084 | op = p + offsetof(struct nd_opt_dnssl, |
| 1085 | nd_opt_dnssl_lifetime); |
| 1086 | op += sizeof(dnssl->nd_opt_dnssl_lifetime); |
| 1087 | n = (size_t)(dnssl->nd_opt_dnssl_len - 1) * 8; |
| 1088 | r = decode_rfc3397(NULL, 0, op, n); |
| 1089 | if (r < 1) { |
| 1090 | logger(ifp->ctx, new_data ? LOG_ERR : LOG_DEBUG, |
| 1091 | "%s: invalid DNSSL option", |
| 1092 | ifp->name); |
| 1093 | continue; |
| 1094 | } else { |
| 1095 | l = (size_t)r + 1; |
| 1096 | tmp = malloc(l); |
| 1097 | if (tmp) { |
| 1098 | decode_rfc3397(tmp, l, op, n); |
| 1099 | l -= 1; |
| 1100 | n = (size_t)print_string(NULL, 0, |
| 1101 | STRING | ARRAY | DOMAIN, |
| 1102 | (const uint8_t *)tmp, l); |
| 1103 | n++; |
| 1104 | opt = malloc(n); |
| 1105 | if (opt) { |
| 1106 | print_string(opt, n, |
| 1107 | STRING | ARRAY | DOMAIN, |
| 1108 | (const uint8_t *)tmp, l); |
| 1109 | } else |
| 1110 | logger(ifp->ctx, LOG_ERR, |
| 1111 | "%s: %m", __func__); |
| 1112 | free(tmp); |
| 1113 | } |
| 1114 | } |
| 1115 | break; |
| 1116 | |
| 1117 | default: |
| 1118 | continue; |
| 1119 | } |
| 1120 | |
| 1121 | if (opt == NULL) { |
| 1122 | logger(ifp->ctx, LOG_ERR, "%s: %m", __func__); |
| 1123 | continue; |
| 1124 | } |
| 1125 | |
| 1126 | n = ndo->nd_opt_type; |
| 1127 | extra_opt: |
| 1128 | TAILQ_FOREACH(rao, &rap->options, next) { |
| 1129 | if (rao->type == n && |
| 1130 | strcmp(rao->option, opt) == 0) |
| 1131 | break; |
| 1132 | } |
| 1133 | if (lifetime == 0 || *opt == '\0') { |
| 1134 | if (rao) { |
| 1135 | TAILQ_REMOVE(&rap->options, rao, next); |
| 1136 | free(rao->option); |
| 1137 | free(rao); |
| 1138 | } |
| 1139 | free(opt); |
| 1140 | free(opt2); |
| 1141 | continue; |
| 1142 | } |
| 1143 | |
| 1144 | if (rao == NULL) { |
| 1145 | rao = malloc(sizeof(*rao)); |
| 1146 | if (rao == NULL) { |
| 1147 | logger(ifp->ctx, LOG_ERR, "%s: %m", __func__); |
| 1148 | continue; |
| 1149 | } |
| 1150 | rao->type = (uint16_t)n; |
| 1151 | rao->option = opt; |
| 1152 | TAILQ_INSERT_TAIL(&rap->options, rao, next); |
| 1153 | } else |
| 1154 | free(opt); |
| 1155 | if (lifetime == ~0U) |
| 1156 | timespecclear(&rao->expire); |
| 1157 | else { |
| 1158 | expire.tv_sec = (time_t)lifetime; |
| 1159 | expire.tv_nsec = 0; |
| 1160 | timespecadd(&rap->received, &expire, &rao->expire); |
| 1161 | } |
| 1162 | if (rao && rao->type == ND_OPT_PREFIX_INFORMATION && opt2) { |
| 1163 | n = _ND_OPT_PREFIX_ADDR; |
| 1164 | opt = opt2; |
| 1165 | opt2 = NULL; |
| 1166 | goto extra_opt; |
| 1167 | } |
| 1168 | } |
| 1169 | |
| 1170 | if (new_rap) |
| 1171 | add_router(ifp->ctx->ipv6, rap); |
| 1172 | if (!ipv6nd_ra_has_public_addr(rap) && |
| 1173 | !(rap->iface->options->options & DHCPCD_IPV6RA_ACCEPT_NOPUBLIC) && |
| 1174 | (!(rap->flags & ND_RA_FLAG_MANAGED) || |
| 1175 | !dhcp6_has_public_addr(rap->iface))) |
| 1176 | { |
| 1177 | logger(rap->iface->ctx, |
| 1178 | rap->no_public_warned ? LOG_DEBUG : LOG_WARNING, |
| 1179 | "%s: ignoring RA from %s" |
| 1180 | " (no public prefix, no managed address)", |
| 1181 | rap->iface->name, rap->sfrom); |
| 1182 | rap->no_public_warned = 1; |
| 1183 | return; |
| 1184 | } |
| 1185 | if (ifp->ctx->options & DHCPCD_TEST) { |
| 1186 | script_runreason(ifp, "TEST"); |
| 1187 | goto handle_flag; |
| 1188 | } |
| 1189 | ipv6_addaddrs(&rap->addrs); |
| 1190 | #ifdef IPV6_MANAGETEMPADDR |
| 1191 | ipv6_addtempaddrs(ifp, &rap->received); |
| 1192 | #endif |
| 1193 | |
| 1194 | /* Find any freshly added routes, such as the subnet route. |
| 1195 | * We do this because we cannot rely on recieving the kernel |
| 1196 | * notification right now via our link socket. */ |
| 1197 | if_initrt6(ifp); |
| 1198 | |
| 1199 | ipv6_buildroutes(ifp->ctx); |
| 1200 | if (ipv6nd_scriptrun(rap)) |
| 1201 | return; |
| 1202 | |
| 1203 | eloop_timeout_delete(ifp->ctx->eloop, NULL, ifp); |
| 1204 | eloop_timeout_delete(ifp->ctx->eloop, NULL, rap); /* reachable timer */ |
| 1205 | |
| 1206 | handle_flag: |
| 1207 | if (!(ifp->options->options & DHCPCD_DHCP6)) |
| 1208 | goto nodhcp6; |
| 1209 | if (rap->flags & ND_RA_FLAG_MANAGED) { |
| 1210 | if (new_data && dhcp6_start(ifp, DH6S_INIT) == -1) |
| 1211 | logger(ifp->ctx, LOG_ERR, |
| 1212 | "dhcp6_start: %s: %m", ifp->name); |
| 1213 | } else if (rap->flags & ND_RA_FLAG_OTHER) { |
| 1214 | if (new_data && dhcp6_start(ifp, DH6S_INFORM) == -1) |
| 1215 | logger(ifp->ctx, LOG_ERR, |
| 1216 | "dhcp6_start: %s: %m", ifp->name); |
| 1217 | } else { |
| 1218 | if (new_data) |
| 1219 | logger(ifp->ctx, LOG_DEBUG, |
| 1220 | "%s: No DHCPv6 instruction in RA", ifp->name); |
| 1221 | nodhcp6: |
| 1222 | if (ifp->ctx->options & DHCPCD_TEST) { |
| 1223 | eloop_exit(ifp->ctx->eloop, EXIT_SUCCESS); |
| 1224 | return; |
| 1225 | } |
| 1226 | } |
| 1227 | |
| 1228 | /* Expire should be called last as the rap object could be destroyed */ |
| 1229 | ipv6nd_expirera(ifp); |
| 1230 | } |
| 1231 | |
| 1232 | /* Run RA's we ignored becuase they had no public addresses |
| 1233 | * This should only be called when DHCPv6 applies a public address */ |
| 1234 | void |
| 1235 | ipv6nd_runignoredra(struct interface *ifp) |
| 1236 | { |
| 1237 | struct ra *rap; |
| 1238 | |
| 1239 | TAILQ_FOREACH(rap, ifp->ctx->ipv6->ra_routers, next) { |
| 1240 | if (rap->iface == ifp && |
| 1241 | !rap->expired && |
| 1242 | rap->no_public_warned) |
| 1243 | { |
| 1244 | rap->no_public_warned = 0; |
| 1245 | logger(rap->iface->ctx, LOG_INFO, |
| 1246 | "%s: applying ignored RA from %s", |
| 1247 | rap->iface->name, rap->sfrom); |
| 1248 | if (ifp->ctx->options & DHCPCD_TEST) { |
| 1249 | script_runreason(ifp, "TEST"); |
| 1250 | continue; |
| 1251 | } |
| 1252 | if (ipv6nd_scriptrun(rap)) |
| 1253 | return; |
| 1254 | eloop_timeout_delete(ifp->ctx->eloop, NULL, ifp); |
| 1255 | eloop_timeout_delete(ifp->ctx->eloop, NULL, rap); |
| 1256 | } |
| 1257 | } |
| 1258 | } |
| 1259 | |
| 1260 | int |
| 1261 | ipv6nd_hasra(const struct interface *ifp) |
| 1262 | { |
| 1263 | const struct ra *rap; |
| 1264 | |
| 1265 | if (ifp->ctx->ipv6) { |
| 1266 | TAILQ_FOREACH(rap, ifp->ctx->ipv6->ra_routers, next) |
| 1267 | if (rap->iface == ifp && !rap->expired) |
| 1268 | return 1; |
| 1269 | } |
| 1270 | return 0; |
| 1271 | } |
| 1272 | |
| 1273 | int |
| 1274 | ipv6nd_hasradhcp(const struct interface *ifp) |
| 1275 | { |
| 1276 | const struct ra *rap; |
| 1277 | |
| 1278 | if (ifp->ctx->ipv6) { |
| 1279 | TAILQ_FOREACH(rap, ifp->ctx->ipv6->ra_routers, next) { |
| 1280 | if (rap->iface == ifp && |
| 1281 | !rap->expired && |
| 1282 | (rap->flags & (ND_RA_FLAG_MANAGED | ND_RA_FLAG_OTHER))) |
| 1283 | return 1; |
| 1284 | } |
| 1285 | } |
| 1286 | return 0; |
| 1287 | } |
| 1288 | |
| 1289 | ssize_t |
| 1290 | ipv6nd_env(char **env, const char *prefix, const struct interface *ifp) |
| 1291 | { |
| 1292 | size_t i, l, len; |
| 1293 | const struct ra *rap; |
| 1294 | const struct ra_opt *rao; |
| 1295 | char buffer[32]; |
| 1296 | const char *optn; |
| 1297 | char **pref, **addr, **mtu, **rdnss, **dnssl, ***var, *new; |
| 1298 | |
| 1299 | i = l = 0; |
| 1300 | TAILQ_FOREACH(rap, ifp->ctx->ipv6->ra_routers, next) { |
| 1301 | if (rap->iface != ifp) |
| 1302 | continue; |
| 1303 | i++; |
| 1304 | if (env) { |
| 1305 | snprintf(buffer, sizeof(buffer), |
| 1306 | "ra%zu_from", i); |
| 1307 | setvar(ifp->ctx, &env, prefix, buffer, rap->sfrom); |
| 1308 | } |
| 1309 | l++; |
| 1310 | |
| 1311 | pref = addr = mtu = rdnss = dnssl = NULL; |
| 1312 | TAILQ_FOREACH(rao, &rap->options, next) { |
| 1313 | if (rao->option == NULL) |
| 1314 | continue; |
| 1315 | var = NULL; |
| 1316 | switch(rao->type) { |
| 1317 | case ND_OPT_PREFIX_INFORMATION: |
| 1318 | optn = "prefix"; |
| 1319 | var = &pref; |
| 1320 | break; |
| 1321 | case _ND_OPT_PREFIX_ADDR: |
| 1322 | optn = "addr"; |
| 1323 | var = &addr; |
| 1324 | break; |
| 1325 | case ND_OPT_MTU: |
| 1326 | optn = "mtu"; |
| 1327 | var = &mtu; |
| 1328 | break; |
| 1329 | case ND_OPT_RDNSS: |
| 1330 | optn = "rdnss"; |
| 1331 | var = &rdnss; |
| 1332 | break; |
| 1333 | case ND_OPT_DNSSL: |
| 1334 | optn = "dnssl"; |
| 1335 | var = &dnssl; |
| 1336 | break; |
| 1337 | default: |
| 1338 | continue; |
| 1339 | } |
| 1340 | if (*var == NULL) { |
| 1341 | *var = env ? env : &new; |
| 1342 | l++; |
| 1343 | } else if (env) { |
| 1344 | /* With single only options, last one takes |
| 1345 | * precedence */ |
| 1346 | if (rao->type == ND_OPT_MTU) { |
| 1347 | new = strchr(**var, '='); |
| 1348 | if (new == NULL) { |
| 1349 | logger(ifp->ctx, LOG_ERR, |
| 1350 | "new is null"); |
| 1351 | continue; |
| 1352 | } else |
| 1353 | new++; |
| 1354 | len = (size_t)(new - **var) + |
| 1355 | strlen(rao->option) + 1; |
| 1356 | if (len > strlen(**var)) |
| 1357 | new = realloc(**var, len); |
| 1358 | else |
| 1359 | new = **var; |
| 1360 | if (new) { |
| 1361 | **var = new; |
| 1362 | new = strchr(**var, '='); |
| 1363 | if (new) { |
| 1364 | len -= |
| 1365 | (size_t) |
| 1366 | (new - **var); |
| 1367 | strlcpy(new + 1, |
| 1368 | rao->option, |
| 1369 | len - 1); |
| 1370 | } else |
| 1371 | logger(ifp->ctx, |
| 1372 | LOG_ERR, |
| 1373 | "new is null"); |
| 1374 | } |
| 1375 | continue; |
| 1376 | } |
| 1377 | len = strlen(rao->option) + 1; |
| 1378 | new = realloc(**var, strlen(**var) + 1 + len); |
| 1379 | if (new) { |
| 1380 | **var = new; |
| 1381 | new += strlen(new); |
| 1382 | *new++ = ' '; |
| 1383 | strlcpy(new, rao->option, len); |
| 1384 | } else |
| 1385 | logger(ifp->ctx, LOG_ERR, |
| 1386 | "%s: %m", __func__); |
| 1387 | continue; |
| 1388 | } |
| 1389 | if (env) { |
| 1390 | snprintf(buffer, sizeof(buffer), |
| 1391 | "ra%zu_%s", i, optn); |
| 1392 | setvar(ifp->ctx, &env, |
| 1393 | prefix, buffer, rao->option); |
| 1394 | } |
| 1395 | } |
| 1396 | } |
| 1397 | |
| 1398 | if (env) |
| 1399 | setvard(ifp->ctx, &env, prefix, "ra_count", i); |
| 1400 | l++; |
| 1401 | return (ssize_t)l; |
| 1402 | } |
| 1403 | |
| 1404 | void |
| 1405 | ipv6nd_handleifa(struct dhcpcd_ctx *ctx, int cmd, const char *ifname, |
| 1406 | const struct in6_addr *addr, int flags) |
| 1407 | { |
| 1408 | struct ra *rap; |
| 1409 | |
| 1410 | if (ctx->ipv6 == NULL) |
| 1411 | return; |
| 1412 | TAILQ_FOREACH(rap, ctx->ipv6->ra_routers, next) { |
| 1413 | if (strcmp(rap->iface->name, ifname)) |
| 1414 | continue; |
| 1415 | ipv6_handleifa_addrs(cmd, &rap->addrs, addr, flags); |
| 1416 | } |
| 1417 | } |
| 1418 | |
| 1419 | void |
| 1420 | ipv6nd_expirera(void *arg) |
| 1421 | { |
| 1422 | struct interface *ifp; |
| 1423 | struct ra *rap, *ran; |
| 1424 | struct ra_opt *rao, *raon; |
| 1425 | struct timespec now, lt, expire, next; |
| 1426 | uint8_t expired, valid, validone; |
| 1427 | |
| 1428 | ifp = arg; |
| 1429 | get_monotonic(&now); |
| 1430 | expired = 0; |
| 1431 | timespecclear(&next); |
| 1432 | |
| 1433 | validone = 0; |
| 1434 | TAILQ_FOREACH_SAFE(rap, ifp->ctx->ipv6->ra_routers, next, ran) { |
| 1435 | if (rap->iface != ifp) |
| 1436 | continue; |
| 1437 | valid = 0; |
| 1438 | if (rap->lifetime) { |
| 1439 | lt.tv_sec = (time_t)rap->lifetime; |
| 1440 | lt.tv_nsec = 0; |
| 1441 | timespecadd(&rap->received, <, &expire); |
| 1442 | if (rap->lifetime == 0 || timespeccmp(&now, &expire, >)) |
| 1443 | { |
| 1444 | if (!rap->expired) { |
| 1445 | logger(ifp->ctx, LOG_WARNING, |
| 1446 | "%s: %s: router expired", |
| 1447 | ifp->name, rap->sfrom); |
| 1448 | rap->expired = expired = 1; |
| 1449 | rap->lifetime = 0; |
| 1450 | } |
| 1451 | } else { |
| 1452 | valid = 1; |
| 1453 | timespecsub(&expire, &now, <); |
| 1454 | if (!timespecisset(&next) || |
| 1455 | timespeccmp(&next, <, >)) |
| 1456 | next = lt; |
| 1457 | } |
| 1458 | } |
| 1459 | |
| 1460 | /* Addresses are expired in ipv6_addaddrs |
| 1461 | * so that DHCPv6 addresses can be removed also. */ |
| 1462 | TAILQ_FOREACH_SAFE(rao, &rap->options, next, raon) { |
| 1463 | if (rap->expired) { |
| 1464 | switch(rao->type) { |
| 1465 | case ND_OPT_RDNSS: /* FALLTHROUGH */ |
| 1466 | case ND_OPT_DNSSL: |
| 1467 | /* RFC6018 end of section 5.2 states |
| 1468 | * that if tha RA has a lifetime of 0 |
| 1469 | * then we should expire these |
| 1470 | * options */ |
| 1471 | TAILQ_REMOVE(&rap->options, rao, next); |
| 1472 | expired = 1; |
| 1473 | free(rao->option); |
| 1474 | free(rao); |
| 1475 | continue; |
| 1476 | } |
| 1477 | } |
| 1478 | if (!timespecisset(&rao->expire)) |
| 1479 | continue; |
| 1480 | if (timespeccmp(&now, &rao->expire, >)) { |
| 1481 | /* Expired prefixes are logged above */ |
| 1482 | if (rao->type != ND_OPT_PREFIX_INFORMATION) |
| 1483 | logger(ifp->ctx, LOG_WARNING, |
| 1484 | "%s: %s: expired option %d", |
| 1485 | ifp->name, rap->sfrom, rao->type); |
| 1486 | TAILQ_REMOVE(&rap->options, rao, next); |
| 1487 | expired = 1; |
| 1488 | free(rao->option); |
| 1489 | free(rao); |
| 1490 | continue; |
| 1491 | } |
| 1492 | valid = 1; |
| 1493 | timespecsub(&rao->expire, &now, <); |
| 1494 | if (!timespecisset(&next) || timespeccmp(&next, <, >)) |
| 1495 | next = lt; |
| 1496 | } |
| 1497 | |
| 1498 | /* No valid lifetimes are left on the RA, so we might |
| 1499 | * as well punt it. */ |
| 1500 | if (!valid && TAILQ_FIRST(&rap->addrs) == NULL) |
| 1501 | ipv6nd_free_ra(rap); |
| 1502 | else |
| 1503 | validone = 1; |
| 1504 | } |
| 1505 | |
| 1506 | if (timespecisset(&next)) |
| 1507 | eloop_timeout_add_tv(ifp->ctx->eloop, |
| 1508 | &next, ipv6nd_expirera, ifp); |
| 1509 | if (expired) { |
| 1510 | ipv6_buildroutes(ifp->ctx); |
| 1511 | script_runreason(ifp, "ROUTERADVERT"); |
| 1512 | } |
| 1513 | |
| 1514 | /* No valid routers? Kill any DHCPv6. */ |
| 1515 | if (!validone) |
| 1516 | dhcp6_drop(ifp, "EXPIRE6"); |
| 1517 | } |
| 1518 | |
| 1519 | void |
| 1520 | ipv6nd_drop(struct interface *ifp) |
| 1521 | { |
| 1522 | struct ra *rap; |
| 1523 | uint8_t expired = 0; |
| 1524 | TAILQ_HEAD(rahead, ra) rtrs; |
| 1525 | |
| 1526 | if (ifp->ctx->ipv6 == NULL) |
| 1527 | return; |
| 1528 | |
| 1529 | eloop_timeout_delete(ifp->ctx->eloop, NULL, ifp); |
| 1530 | TAILQ_INIT(&rtrs); |
| 1531 | TAILQ_FOREACH(rap, ifp->ctx->ipv6->ra_routers, next) { |
| 1532 | if (rap->iface == ifp) { |
| 1533 | rap->expired = expired = 1; |
| 1534 | TAILQ_REMOVE(ifp->ctx->ipv6->ra_routers, rap, next); |
| 1535 | TAILQ_INSERT_TAIL(&rtrs, rap, next); |
| 1536 | } |
| 1537 | } |
| 1538 | if (expired) { |
| 1539 | while ((rap = TAILQ_FIRST(&rtrs))) { |
| 1540 | TAILQ_REMOVE(&rtrs, rap, next); |
| 1541 | ipv6nd_drop_ra(rap); |
| 1542 | } |
| 1543 | ipv6_buildroutes(ifp->ctx); |
| 1544 | if ((ifp->options->options & |
| 1545 | (DHCPCD_EXITING | DHCPCD_PERSISTENT)) != |
| 1546 | (DHCPCD_EXITING | DHCPCD_PERSISTENT)) |
| 1547 | script_runreason(ifp, "ROUTERADVERT"); |
| 1548 | } |
| 1549 | } |
| 1550 | |
| 1551 | static void |
| 1552 | ipv6nd_handlena(struct dhcpcd_ctx *dctx, struct interface *ifp, |
| 1553 | struct icmp6_hdr *icp, size_t len) |
| 1554 | { |
| 1555 | struct ipv6_ctx *ctx = dctx->ipv6; |
| 1556 | struct nd_neighbor_advert *nd_na; |
| 1557 | struct ra *rap; |
| 1558 | uint32_t is_router, is_solicited; |
| 1559 | char buf[INET6_ADDRSTRLEN]; |
| 1560 | const char *taddr; |
| 1561 | |
| 1562 | if (ifp == NULL) { |
| 1563 | #ifdef DEBUG_NS |
| 1564 | logger(ctx, LOG_DEBUG, "NA for unexpected interface from %s", |
| 1565 | dctx->sfrom); |
| 1566 | #endif |
| 1567 | return; |
| 1568 | } |
| 1569 | |
| 1570 | if ((size_t)len < sizeof(struct nd_neighbor_advert)) { |
| 1571 | logger(ifp->ctx, LOG_ERR, "%s: IPv6 NA too short from %s", |
| 1572 | ifp->name, ctx->sfrom); |
| 1573 | return; |
| 1574 | } |
| 1575 | |
| 1576 | nd_na = (struct nd_neighbor_advert *)icp; |
| 1577 | is_router = nd_na->nd_na_flags_reserved & ND_NA_FLAG_ROUTER; |
| 1578 | is_solicited = nd_na->nd_na_flags_reserved & ND_NA_FLAG_SOLICITED; |
| 1579 | taddr = inet_ntop(AF_INET6, &nd_na->nd_na_target, |
| 1580 | buf, INET6_ADDRSTRLEN); |
| 1581 | |
| 1582 | if (IN6_IS_ADDR_MULTICAST(&nd_na->nd_na_target)) { |
| 1583 | logger(ifp->ctx, LOG_ERR, "%s: NA multicast address %s (%s)", |
| 1584 | ifp->name, taddr, ctx->sfrom); |
| 1585 | return; |
| 1586 | } |
| 1587 | |
| 1588 | TAILQ_FOREACH(rap, ctx->ra_routers, next) { |
| 1589 | if (rap->iface == ifp && |
| 1590 | IN6_ARE_ADDR_EQUAL(&rap->from, &nd_na->nd_na_target)) |
| 1591 | break; |
| 1592 | } |
| 1593 | if (rap == NULL) { |
| 1594 | #ifdef DEBUG_NS |
| 1595 | logger(ifp->ctx, LOG_DEBUG, "%s: unexpected NA from %s for %s", |
| 1596 | ifp->name, ctx->sfrom, taddr); |
| 1597 | #endif |
| 1598 | return; |
| 1599 | } |
| 1600 | |
| 1601 | #ifdef DEBUG_NS |
| 1602 | logger(ifp->ctx, LOG_DEBUG, "%s: %sNA for %s from %s", |
| 1603 | ifp->name, is_solicited ? "solicited " : "", taddr, ctx->sfrom); |
| 1604 | #endif |
| 1605 | |
| 1606 | /* Node is no longer a router, so remove it from consideration */ |
| 1607 | if (!is_router && !rap->expired) { |
| 1608 | logger(ifp->ctx, LOG_INFO, "%s: %s not a router (%s)", |
| 1609 | ifp->name, taddr, ctx->sfrom); |
| 1610 | rap->expired = 1; |
| 1611 | ipv6_buildroutes(ifp->ctx); |
| 1612 | script_runreason(ifp, "ROUTERADVERT"); |
| 1613 | return; |
| 1614 | } |
| 1615 | |
| 1616 | if (is_solicited && is_router && rap->lifetime) { |
| 1617 | if (rap->expired) { |
| 1618 | rap->expired = 0; |
| 1619 | logger(ifp->ctx, LOG_INFO, "%s: %s reachable (%s)", |
| 1620 | ifp->name, taddr, ctx->sfrom); |
| 1621 | ipv6_buildroutes(ifp->ctx); |
| 1622 | script_runreason(rap->iface, "ROUTERADVERT"); /* XXX */ |
| 1623 | } |
| 1624 | } |
| 1625 | } |
| 1626 | |
| 1627 | static void |
| 1628 | ipv6nd_handledata(void *arg) |
| 1629 | { |
| 1630 | struct dhcpcd_ctx *dctx; |
| 1631 | struct ipv6_ctx *ctx; |
| 1632 | ssize_t len; |
| 1633 | struct cmsghdr *cm; |
| 1634 | int hoplimit; |
| 1635 | struct in6_pktinfo pkt; |
| 1636 | struct icmp6_hdr *icp; |
| 1637 | struct interface *ifp; |
| 1638 | |
| 1639 | dctx = arg; |
| 1640 | ctx = dctx->ipv6; |
| 1641 | ctx->rcvhdr.msg_controllen = CMSG_SPACE(sizeof(struct in6_pktinfo)) + |
| 1642 | CMSG_SPACE(sizeof(int)); |
| 1643 | len = recvmsg(ctx->nd_fd, &ctx->rcvhdr, 0); |
| 1644 | if (len == -1) { |
| 1645 | logger(dctx, LOG_ERR, "recvmsg: %m"); |
| 1646 | eloop_event_delete(dctx->eloop, ctx->nd_fd, 0); |
| 1647 | close(ctx->nd_fd); |
| 1648 | ctx->nd_fd = -1; |
| 1649 | return; |
| 1650 | } |
| 1651 | ctx->sfrom = inet_ntop(AF_INET6, &ctx->from.sin6_addr, |
| 1652 | ctx->ntopbuf, INET6_ADDRSTRLEN); |
| 1653 | if ((size_t)len < sizeof(struct icmp6_hdr)) { |
| 1654 | logger(dctx, LOG_ERR, "IPv6 ICMP packet too short from %s", |
| 1655 | ctx->sfrom); |
| 1656 | return; |
| 1657 | } |
| 1658 | |
| 1659 | pkt.ipi6_ifindex = 0; |
| 1660 | hoplimit = 0; |
| 1661 | for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(&ctx->rcvhdr); |
| 1662 | cm; |
| 1663 | cm = (struct cmsghdr *)CMSG_NXTHDR(&ctx->rcvhdr, cm)) |
| 1664 | { |
| 1665 | if (cm->cmsg_level != IPPROTO_IPV6) |
| 1666 | continue; |
| 1667 | switch(cm->cmsg_type) { |
| 1668 | case IPV6_PKTINFO: |
| 1669 | if (cm->cmsg_len == CMSG_LEN(sizeof(pkt))) |
| 1670 | memcpy(&pkt, CMSG_DATA(cm), sizeof(pkt)); |
| 1671 | break; |
| 1672 | case IPV6_HOPLIMIT: |
| 1673 | if (cm->cmsg_len == CMSG_LEN(sizeof(int))) |
| 1674 | memcpy(&hoplimit, CMSG_DATA(cm), sizeof(int)); |
| 1675 | break; |
| 1676 | } |
| 1677 | } |
| 1678 | |
| 1679 | if (pkt.ipi6_ifindex == 0 || hoplimit == 0) { |
| 1680 | logger(dctx, LOG_ERR, |
| 1681 | "IPv6 RA/NA did not contain index or hop limit from %s", |
| 1682 | ctx->sfrom); |
| 1683 | return; |
| 1684 | } |
| 1685 | |
| 1686 | TAILQ_FOREACH(ifp, dctx->ifaces, next) { |
| 1687 | if (ifp->index == (unsigned int)pkt.ipi6_ifindex && |
| 1688 | !(ifp->options->options & DHCPCD_PFXDLGONLY)) |
| 1689 | { |
| 1690 | if (!(ifp->options->options & DHCPCD_IPV6)) |
| 1691 | return; |
| 1692 | break; |
| 1693 | } |
| 1694 | } |
| 1695 | |
| 1696 | icp = (struct icmp6_hdr *)ctx->rcvhdr.msg_iov[0].iov_base; |
| 1697 | if (icp->icmp6_code == 0) { |
| 1698 | switch(icp->icmp6_type) { |
| 1699 | case ND_NEIGHBOR_ADVERT: |
| 1700 | ipv6nd_handlena(dctx, ifp, icp, (size_t)len); |
| 1701 | return; |
| 1702 | case ND_ROUTER_ADVERT: |
| 1703 | ipv6nd_handlera(dctx, ifp, icp, (size_t)len); |
| 1704 | return; |
| 1705 | } |
| 1706 | } |
| 1707 | |
| 1708 | logger(dctx, LOG_ERR, "invalid IPv6 type %d or code %d from %s", |
| 1709 | icp->icmp6_type, icp->icmp6_code, ctx->sfrom); |
| 1710 | } |
| 1711 | |
| 1712 | static void |
| 1713 | ipv6nd_startrs1(void *arg) |
| 1714 | { |
| 1715 | struct interface *ifp = arg; |
| 1716 | struct rs_state *state; |
| 1717 | |
| 1718 | logger(ifp->ctx, LOG_INFO, "%s: soliciting an IPv6 router", ifp->name); |
| 1719 | if (ipv6nd_open(ifp->ctx) == -1) { |
| 1720 | logger(ifp->ctx, LOG_ERR, "%s: ipv6nd_open: %m", __func__); |
| 1721 | return; |
| 1722 | } |
| 1723 | |
| 1724 | state = RS_STATE(ifp); |
| 1725 | if (state == NULL) { |
| 1726 | ifp->if_data[IF_DATA_IPV6ND] = calloc(1, sizeof(*state)); |
| 1727 | state = RS_STATE(ifp); |
| 1728 | if (state == NULL) { |
| 1729 | logger(ifp->ctx, LOG_ERR, "%s: %m", __func__); |
| 1730 | return; |
| 1731 | } |
| 1732 | } |
| 1733 | |
| 1734 | /* Always make a new probe as the underlying hardware |
| 1735 | * address could have changed. */ |
| 1736 | ipv6nd_makersprobe(ifp); |
| 1737 | if (state->rs == NULL) { |
| 1738 | logger(ifp->ctx, LOG_ERR, |
| 1739 | "%s: ipv6ns_makersprobe: %m", __func__); |
| 1740 | return; |
| 1741 | } |
| 1742 | |
| 1743 | state->rsprobes = 0; |
| 1744 | ipv6nd_sendrsprobe(ifp); |
| 1745 | } |
| 1746 | |
| 1747 | void |
| 1748 | ipv6nd_startrs(struct interface *ifp) |
| 1749 | { |
| 1750 | struct timespec tv; |
| 1751 | |
| 1752 | eloop_timeout_delete(ifp->ctx->eloop, NULL, ifp); |
| 1753 | tv.tv_sec = 0; |
| 1754 | tv.tv_nsec = (suseconds_t)arc4random_uniform( |
| 1755 | MAX_RTR_SOLICITATION_DELAY * NSEC_PER_SEC); |
| 1756 | timespecnorm(&tv); |
| 1757 | logger(ifp->ctx, LOG_DEBUG, |
| 1758 | "%s: delaying IPv6 router solicitation for %0.1f seconds", |
| 1759 | ifp->name, timespec_to_double(&tv)); |
| 1760 | eloop_timeout_add_tv(ifp->ctx->eloop, &tv, ipv6nd_startrs1, ifp); |
| 1761 | return; |
| 1762 | } |