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/param.h> |
| 29 | #include <sys/types.h> |
| 30 | #include <sys/ioctl.h> |
| 31 | #include <sys/socket.h> |
| 32 | |
| 33 | #include <net/if.h> |
| 34 | #include <net/if_arp.h> |
| 35 | #include <netinet/in.h> |
| 36 | #ifdef __FreeBSD__ /* Needed so that including netinet6/in6_var.h works */ |
| 37 | # include <net/if_var.h> |
| 38 | #endif |
| 39 | #ifdef AF_LINK |
| 40 | # include <net/if_dl.h> |
| 41 | # include <net/if_types.h> |
| 42 | # include <netinet/in_var.h> |
| 43 | #endif |
| 44 | #ifdef AF_PACKET |
| 45 | # include <netpacket/packet.h> |
| 46 | #endif |
| 47 | #ifdef SIOCGIFMEDIA |
| 48 | # include <net/if_media.h> |
| 49 | #endif |
| 50 | #include <net/route.h> |
| 51 | |
| 52 | #include <ctype.h> |
| 53 | #include <errno.h> |
| 54 | #include <ifaddrs.h> |
| 55 | #include <fnmatch.h> |
| 56 | #include <stddef.h> |
| 57 | #include <stdio.h> |
| 58 | #include <stdlib.h> |
| 59 | #include <string.h> |
| 60 | #include <unistd.h> |
| 61 | |
| 62 | #include "config.h" |
| 63 | #include "common.h" |
| 64 | #include "dev.h" |
| 65 | #include "dhcp.h" |
| 66 | #include "dhcp6.h" |
| 67 | #include "if.h" |
| 68 | #include "if-options.h" |
| 69 | #include "ipv4.h" |
| 70 | #include "ipv6nd.h" |
| 71 | |
| 72 | #ifdef __QNX__ |
| 73 | /* QNX carries defines for, but does not actually support PF_LINK */ |
| 74 | #undef IFLR_ACTIVE |
| 75 | #endif |
| 76 | |
Samuel Tan | a359582 | 2015-08-13 16:41:21 -0700 | [diff] [blame] | 77 | int |
| 78 | split_interface_lease(const char *ifname, int *interface_name_len, |
| 79 | const char **lease_identifier) |
| 80 | { |
| 81 | int ret = 0; |
| 82 | int len; |
| 83 | const char *lease_ptr = ifname; |
| 84 | const char *p = strchr(ifname, '='); |
| 85 | |
| 86 | if (interface_name_len) |
| 87 | len = *interface_name_len; |
| 88 | else |
| 89 | len = strlen(ifname); |
| 90 | |
| 91 | if (p) { |
| 92 | lease_ptr = p + 1; |
| 93 | if (len > p - ifname) |
| 94 | len = p - ifname; |
| 95 | ret = 1; |
| 96 | } |
| 97 | |
| 98 | if (interface_name_len) |
| 99 | *interface_name_len = len; |
| 100 | if (lease_identifier) |
| 101 | *lease_identifier = lease_ptr; |
| 102 | return ret; |
| 103 | } |
| 104 | |
Samuel Tan | d7ed851 | 2015-08-13 16:11:35 -0700 | [diff] [blame] | 105 | void |
| 106 | if_free(struct interface *ifp) |
| 107 | { |
| 108 | |
| 109 | if (ifp == NULL) |
| 110 | return; |
| 111 | ipv4_free(ifp); |
| 112 | dhcp_free(ifp); |
| 113 | dhcp6_free(ifp); |
| 114 | ipv6nd_free(ifp); |
| 115 | ipv6_free(ifp); |
| 116 | free_options(ifp->options); |
| 117 | free(ifp); |
| 118 | } |
| 119 | |
| 120 | int |
| 121 | if_carrier(struct interface *iface) |
| 122 | { |
| 123 | int s, r; |
| 124 | struct ifreq ifr; |
| 125 | #ifdef SIOCGIFMEDIA |
| 126 | struct ifmediareq ifmr; |
| 127 | #endif |
| 128 | |
| 129 | if ((s = socket(PF_INET, SOCK_DGRAM, 0)) == -1) |
| 130 | return LINK_UNKNOWN; |
| 131 | memset(&ifr, 0, sizeof(ifr)); |
| 132 | strlcpy(ifr.ifr_name, iface->name, sizeof(ifr.ifr_name)); |
| 133 | if (ioctl(s, SIOCGIFFLAGS, &ifr) == -1) { |
| 134 | close(s); |
| 135 | return LINK_UNKNOWN; |
| 136 | } |
| 137 | iface->flags = (unsigned int)ifr.ifr_flags; |
| 138 | |
| 139 | #ifdef SIOCGIFMEDIA |
| 140 | memset(&ifmr, 0, sizeof(ifmr)); |
| 141 | strlcpy(ifmr.ifm_name, iface->name, sizeof(ifmr.ifm_name)); |
| 142 | if (ioctl(s, SIOCGIFMEDIA, &ifmr) != -1 && |
| 143 | ifmr.ifm_status & IFM_AVALID) |
| 144 | r = (ifmr.ifm_status & IFM_ACTIVE) ? LINK_UP : LINK_DOWN; |
| 145 | else |
| 146 | r = ifr.ifr_flags & IFF_RUNNING ? LINK_UP : LINK_UNKNOWN; |
| 147 | #else |
| 148 | r = ifr.ifr_flags & IFF_RUNNING ? LINK_UP : LINK_DOWN; |
| 149 | #endif |
| 150 | close(s); |
| 151 | return r; |
| 152 | } |
| 153 | |
| 154 | int |
| 155 | if_setflag(struct interface *ifp, short flag) |
| 156 | { |
| 157 | struct ifreq ifr; |
| 158 | int s, r; |
| 159 | |
| 160 | if ((s = socket(PF_INET, SOCK_DGRAM, 0)) == -1) |
| 161 | return -1; |
| 162 | memset(&ifr, 0, sizeof(ifr)); |
| 163 | strlcpy(ifr.ifr_name, ifp->name, sizeof(ifr.ifr_name)); |
| 164 | r = -1; |
| 165 | if (ioctl(s, SIOCGIFFLAGS, &ifr) == 0) { |
| 166 | if (flag == 0 || (ifr.ifr_flags & flag) == flag) |
| 167 | r = 0; |
| 168 | else { |
| 169 | ifr.ifr_flags |= flag; |
| 170 | if (ioctl(s, SIOCSIFFLAGS, &ifr) == 0) |
| 171 | r = 0; |
| 172 | } |
| 173 | ifp->flags = (unsigned int)ifr.ifr_flags; |
| 174 | } |
| 175 | close(s); |
| 176 | return r; |
| 177 | } |
| 178 | |
| 179 | static int |
| 180 | if_hasconf(struct dhcpcd_ctx *ctx, const char *ifname) |
| 181 | { |
| 182 | int i; |
| 183 | |
| 184 | for (i = 0; i < ctx->ifcc; i++) { |
| 185 | if (strcmp(ctx->ifcv[i], ifname) == 0) |
| 186 | return 1; |
| 187 | } |
| 188 | return 0; |
| 189 | } |
| 190 | |
| 191 | static void if_learnaddrs1(struct dhcpcd_ctx *ctx, struct if_head *ifs, |
| 192 | struct ifaddrs *ifaddrs) |
| 193 | { |
| 194 | struct ifaddrs *ifa; |
| 195 | struct interface *ifp; |
| 196 | #ifdef INET |
| 197 | const struct sockaddr_in *addr, *net, *dst; |
| 198 | #endif |
| 199 | #ifdef INET6 |
| 200 | struct sockaddr_in6 *sin6, *net6; |
| 201 | #endif |
| 202 | int ifa_flags; |
| 203 | |
| 204 | |
| 205 | for (ifa = ifaddrs; ifa; ifa = ifa->ifa_next) { |
| 206 | if (ifa->ifa_addr == NULL) |
| 207 | continue; |
| 208 | if ((ifp = if_find(ifs, ifa->ifa_name)) == NULL) |
| 209 | continue; |
| 210 | switch(ifa->ifa_addr->sa_family) { |
| 211 | #ifdef INET |
| 212 | case AF_INET: |
| 213 | addr = (const struct sockaddr_in *) |
| 214 | (void *)ifa->ifa_addr; |
| 215 | net = (const struct sockaddr_in *) |
| 216 | (void *)ifa->ifa_netmask; |
| 217 | if (ifa->ifa_flags & IFF_POINTOPOINT) |
| 218 | dst = (const struct sockaddr_in *) |
| 219 | (void *)ifa->ifa_dstaddr; |
| 220 | else |
| 221 | dst = NULL; |
| 222 | ifa_flags = if_addrflags(&addr->sin_addr, ifp); |
| 223 | ipv4_handleifa(ctx, RTM_NEWADDR, ifs, ifa->ifa_name, |
| 224 | &addr->sin_addr, |
| 225 | &net->sin_addr, |
| 226 | dst ? &dst->sin_addr : NULL, ifa_flags); |
| 227 | break; |
| 228 | #endif |
| 229 | #ifdef INET6 |
| 230 | case AF_INET6: |
| 231 | sin6 = (struct sockaddr_in6 *)(void *)ifa->ifa_addr; |
| 232 | net6 = (struct sockaddr_in6 *)(void *)ifa->ifa_netmask; |
| 233 | #ifdef __KAME__ |
| 234 | if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) |
| 235 | /* Remove the scope from the address */ |
| 236 | sin6->sin6_addr.s6_addr[2] = |
| 237 | sin6->sin6_addr.s6_addr[3] = '\0'; |
| 238 | #endif |
| 239 | ifa_flags = if_addrflags6(&sin6->sin6_addr, ifp); |
| 240 | if (ifa_flags != -1) |
| 241 | ipv6_handleifa(ctx, RTM_NEWADDR, ifs, |
| 242 | ifa->ifa_name, |
| 243 | &sin6->sin6_addr, |
| 244 | ipv6_prefixlen(&net6->sin6_addr), |
| 245 | ifa_flags); |
| 246 | break; |
| 247 | #endif |
| 248 | } |
| 249 | } |
| 250 | } |
| 251 | |
| 252 | struct if_head * |
| 253 | if_discover(struct dhcpcd_ctx *ctx, int argc, char * const *argv) |
| 254 | { |
| 255 | struct ifaddrs *ifaddrs, *ifa; |
| 256 | char *p; |
| 257 | int i; |
| 258 | struct if_head *ifs; |
| 259 | struct interface *ifp; |
Samuel Tan | a359582 | 2015-08-13 16:41:21 -0700 | [diff] [blame] | 260 | const char *lease_identifier; |
Samuel Tan | d7ed851 | 2015-08-13 16:11:35 -0700 | [diff] [blame] | 261 | char ifn[IF_NAMESIZE]; |
Samuel Tan | a359582 | 2015-08-13 16:41:21 -0700 | [diff] [blame] | 262 | |
| 263 | #ifdef __linux__ |
| 264 | char alias[IF_NAMESIZE]; |
Samuel Tan | d7ed851 | 2015-08-13 16:11:35 -0700 | [diff] [blame] | 265 | #endif |
Samuel Tan | a359582 | 2015-08-13 16:41:21 -0700 | [diff] [blame] | 266 | |
Samuel Tan | d7ed851 | 2015-08-13 16:11:35 -0700 | [diff] [blame] | 267 | #ifdef AF_LINK |
| 268 | const struct sockaddr_dl *sdl; |
| 269 | #ifdef SIOCGIFPRIORITY |
| 270 | struct ifreq ifr; |
| 271 | int s_inet; |
| 272 | #endif |
| 273 | #ifdef IFLR_ACTIVE |
| 274 | struct if_laddrreq iflr; |
| 275 | int s_link; |
| 276 | #endif |
| 277 | |
| 278 | #ifdef SIOCGIFPRIORITY |
| 279 | if ((s_inet = socket(PF_INET, SOCK_DGRAM, 0)) == -1) |
| 280 | return NULL; |
| 281 | #endif |
| 282 | #ifdef IFLR_ACTIVE |
| 283 | if ((s_link = socket(PF_LINK, SOCK_DGRAM, 0)) == -1) { |
| 284 | #ifdef SIOCGIFPRIORITY |
| 285 | close(s_inet); |
| 286 | #endif |
| 287 | return NULL; |
| 288 | } |
| 289 | memset(&iflr, 0, sizeof(iflr)); |
| 290 | #endif |
| 291 | #elif AF_PACKET |
| 292 | const struct sockaddr_ll *sll; |
| 293 | #endif |
| 294 | |
| 295 | if (getifaddrs(&ifaddrs) == -1) |
| 296 | return NULL; |
| 297 | ifs = malloc(sizeof(*ifs)); |
| 298 | if (ifs == NULL) |
| 299 | return NULL; |
| 300 | TAILQ_INIT(ifs); |
| 301 | |
| 302 | for (ifa = ifaddrs; ifa; ifa = ifa->ifa_next) { |
| 303 | if (ifa->ifa_addr != NULL) { |
| 304 | #ifdef AF_LINK |
| 305 | if (ifa->ifa_addr->sa_family != AF_LINK) |
| 306 | continue; |
| 307 | #elif AF_PACKET |
| 308 | if (ifa->ifa_addr->sa_family != AF_PACKET) |
| 309 | continue; |
| 310 | #endif |
| 311 | } |
| 312 | |
| 313 | /* It's possible for an interface to have >1 AF_LINK. |
| 314 | * For our purposes, we use the first one. */ |
| 315 | TAILQ_FOREACH(ifp, ifs, next) { |
| 316 | if (strcmp(ifp->name, ifa->ifa_name) == 0) |
| 317 | break; |
| 318 | } |
| 319 | if (ifp) |
| 320 | continue; |
| 321 | |
Samuel Tan | a359582 | 2015-08-13 16:41:21 -0700 | [diff] [blame] | 322 | lease_identifier = NULL; |
Samuel Tan | d7ed851 | 2015-08-13 16:11:35 -0700 | [diff] [blame] | 323 | if (argc > 0) { |
| 324 | for (i = 0; i < argc; i++) { |
Samuel Tan | a359582 | 2015-08-13 16:41:21 -0700 | [diff] [blame] | 325 | int intf_len = strlen(argv[i]); |
| 326 | split_interface_lease(argv[i], &intf_len, |
| 327 | &lease_identifier); |
| 328 | if (intf_len > IF_NAMESIZE) |
| 329 | continue; |
| 330 | strlcpy(ifn, argv[i], intf_len + 1); |
Samuel Tan | d7ed851 | 2015-08-13 16:11:35 -0700 | [diff] [blame] | 331 | #ifdef __linux__ |
Samuel Tan | a359582 | 2015-08-13 16:41:21 -0700 | [diff] [blame] | 332 | strlcpy(alias, argv[i], intf_len + 1); |
Samuel Tan | d7ed851 | 2015-08-13 16:11:35 -0700 | [diff] [blame] | 333 | /* Check the real interface name */ |
Samuel Tan | d7ed851 | 2015-08-13 16:11:35 -0700 | [diff] [blame] | 334 | p = strchr(ifn, ':'); |
| 335 | if (p) |
| 336 | *p = '\0'; |
Samuel Tan | a359582 | 2015-08-13 16:41:21 -0700 | [diff] [blame] | 337 | #endif |
Samuel Tan | d7ed851 | 2015-08-13 16:11:35 -0700 | [diff] [blame] | 338 | if (strcmp(ifn, ifa->ifa_name) == 0) |
| 339 | break; |
Samuel Tan | d7ed851 | 2015-08-13 16:11:35 -0700 | [diff] [blame] | 340 | } |
| 341 | if (i == argc) |
| 342 | continue; |
Samuel Tan | d7ed851 | 2015-08-13 16:11:35 -0700 | [diff] [blame] | 343 | } else { |
Samuel Tan | d7ed851 | 2015-08-13 16:11:35 -0700 | [diff] [blame] | 344 | strlcpy(ifn, ifa->ifa_name, sizeof(ifn)); |
Samuel Tan | a359582 | 2015-08-13 16:41:21 -0700 | [diff] [blame] | 345 | #ifdef __linux |
| 346 | strlcpy(alias, ifa->ifa_name, sizeof(alias)); |
Samuel Tan | d7ed851 | 2015-08-13 16:11:35 -0700 | [diff] [blame] | 347 | #endif |
| 348 | /* -1 means we're discovering against a specific |
| 349 | * interface, but we still need the below rules |
| 350 | * to apply. */ |
| 351 | if (argc == -1 && strcmp(argv[0], ifa->ifa_name) != 0) |
| 352 | continue; |
| 353 | } |
Samuel Tan | a359582 | 2015-08-13 16:41:21 -0700 | [diff] [blame] | 354 | p = ifn; |
| 355 | |
Samuel Tan | d7ed851 | 2015-08-13 16:11:35 -0700 | [diff] [blame] | 356 | for (i = 0; i < ctx->ifdc; i++) |
| 357 | if (!fnmatch(ctx->ifdv[i], p, 0)) |
| 358 | break; |
| 359 | if (i < ctx->ifdc) |
| 360 | continue; |
| 361 | for (i = 0; i < ctx->ifac; i++) |
| 362 | if (!fnmatch(ctx->ifav[i], p, 0)) |
| 363 | break; |
| 364 | if (ctx->ifac && i == ctx->ifac) |
| 365 | continue; |
| 366 | |
| 367 | /* Ensure that the interface name has settled */ |
| 368 | if (!dev_initialized(ctx, p)) |
| 369 | continue; |
| 370 | |
| 371 | /* Don't allow loopback or pointopoint unless explicit */ |
| 372 | if (ifa->ifa_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) { |
| 373 | if ((argc == 0 || argc == -1) && |
| 374 | ctx->ifac == 0 && !if_hasconf(ctx, p)) |
| 375 | continue; |
| 376 | } |
| 377 | |
| 378 | if (if_vimaster(p) == 1) { |
| 379 | logger(ctx, argc ? LOG_ERR : LOG_DEBUG, |
| 380 | "%s: is a Virtual Interface Master, skipping", p); |
| 381 | continue; |
| 382 | } |
| 383 | |
| 384 | ifp = calloc(1, sizeof(*ifp)); |
| 385 | if (ifp == NULL) { |
| 386 | logger(ctx, LOG_ERR, "%s: %m", __func__); |
| 387 | break; |
| 388 | } |
| 389 | ifp->ctx = ctx; |
| 390 | #ifdef __linux__ |
Samuel Tan | a359582 | 2015-08-13 16:41:21 -0700 | [diff] [blame] | 391 | strlcpy(ifp->alias, alias, sizeof(ifp->alias)); |
Samuel Tan | d7ed851 | 2015-08-13 16:11:35 -0700 | [diff] [blame] | 392 | #endif |
Samuel Tan | a359582 | 2015-08-13 16:41:21 -0700 | [diff] [blame] | 393 | strlcpy(ifp->name, p, sizeof(ifp->name)); |
| 394 | if (lease_identifier) { |
| 395 | strlcpy(ifp->lease_identifier, lease_identifier, |
| 396 | sizeof(ifp->lease_identifier)); |
| 397 | } |
Samuel Tan | d7ed851 | 2015-08-13 16:11:35 -0700 | [diff] [blame] | 398 | ifp->flags = ifa->ifa_flags; |
| 399 | ifp->carrier = if_carrier(ifp); |
| 400 | |
| 401 | if (ifa->ifa_addr != NULL) { |
| 402 | #ifdef AF_LINK |
| 403 | sdl = (const struct sockaddr_dl *)(void *)ifa->ifa_addr; |
| 404 | |
| 405 | #ifdef IFLR_ACTIVE |
| 406 | /* We need to check for active address */ |
| 407 | strlcpy(iflr.iflr_name, ifp->name, |
| 408 | sizeof(iflr.iflr_name)); |
| 409 | memcpy(&iflr.addr, ifa->ifa_addr, |
| 410 | MIN(ifa->ifa_addr->sa_len, sizeof(iflr.addr))); |
| 411 | iflr.flags = IFLR_PREFIX; |
| 412 | iflr.prefixlen = (unsigned int)sdl->sdl_alen * NBBY; |
| 413 | if (ioctl(s_link, SIOCGLIFADDR, &iflr) == -1 || |
| 414 | !(iflr.flags & IFLR_ACTIVE)) |
| 415 | { |
| 416 | if_free(ifp); |
| 417 | continue; |
| 418 | } |
| 419 | #endif |
| 420 | |
| 421 | ifp->index = sdl->sdl_index; |
| 422 | switch(sdl->sdl_type) { |
| 423 | #ifdef IFT_BRIDGE |
| 424 | case IFT_BRIDGE: /* FALLTHROUGH */ |
| 425 | #endif |
| 426 | #ifdef IFT_PPP |
| 427 | case IFT_PPP: /* FALLTHROUGH */ |
| 428 | #endif |
| 429 | #ifdef IFT_PROPVIRTUAL |
| 430 | case IFT_PROPVIRTUAL: /* FALLTHROUGH */ |
| 431 | #endif |
| 432 | #if defined(IFT_BRIDGE) || defined(IFT_PPP) || defined(IFT_PROPVIRTUAL) |
| 433 | /* Don't allow unless explicit */ |
| 434 | if ((argc == 0 || argc == -1) && |
| 435 | ctx->ifac == 0 && |
| 436 | !if_hasconf(ctx, ifp->name)) |
| 437 | { |
| 438 | logger(ifp->ctx, LOG_DEBUG, |
| 439 | "%s: ignoring due to" |
| 440 | " interface type and" |
| 441 | " no config", |
| 442 | ifp->name); |
| 443 | if_free(ifp); |
| 444 | continue; |
| 445 | } |
| 446 | /* FALLTHROUGH */ |
| 447 | #endif |
| 448 | #ifdef IFT_L2VLAN |
| 449 | case IFT_L2VLAN: /* FALLTHROUGH */ |
| 450 | #endif |
| 451 | #ifdef IFT_L3IPVLAN |
| 452 | case IFT_L3IPVLAN: /* FALLTHROUGH */ |
| 453 | #endif |
| 454 | case IFT_ETHER: |
| 455 | ifp->family = ARPHRD_ETHER; |
| 456 | break; |
| 457 | #ifdef IFT_IEEE1394 |
| 458 | case IFT_IEEE1394: |
| 459 | ifp->family = ARPHRD_IEEE1394; |
| 460 | break; |
| 461 | #endif |
| 462 | #ifdef IFT_INFINIBAND |
| 463 | case IFT_INFINIBAND: |
| 464 | ifp->family = ARPHRD_INFINIBAND; |
| 465 | break; |
| 466 | #endif |
| 467 | default: |
| 468 | /* Don't allow unless explicit */ |
| 469 | if ((argc == 0 || argc == -1) && |
| 470 | ctx->ifac == 0 && |
| 471 | !if_hasconf(ctx, ifp->name)) |
| 472 | { |
| 473 | if_free(ifp); |
| 474 | continue; |
| 475 | } |
| 476 | logger(ifp->ctx, LOG_WARNING, |
| 477 | "%s: unsupported interface type %.2x", |
| 478 | ifp->name, sdl->sdl_type); |
| 479 | /* Pretend it's ethernet */ |
| 480 | ifp->family = ARPHRD_ETHER; |
| 481 | break; |
| 482 | } |
| 483 | ifp->hwlen = sdl->sdl_alen; |
| 484 | #ifndef CLLADDR |
| 485 | # define CLLADDR(s) ((const char *)((s)->sdl_data + (s)->sdl_nlen)) |
| 486 | #endif |
| 487 | memcpy(ifp->hwaddr, CLLADDR(sdl), ifp->hwlen); |
| 488 | #elif AF_PACKET |
| 489 | sll = (const struct sockaddr_ll *)(void *)ifa->ifa_addr; |
| 490 | ifp->index = (unsigned int)sll->sll_ifindex; |
| 491 | ifp->family = sll->sll_hatype; |
| 492 | ifp->hwlen = sll->sll_halen; |
| 493 | if (ifp->hwlen != 0) |
| 494 | memcpy(ifp->hwaddr, sll->sll_addr, ifp->hwlen); |
| 495 | #endif |
| 496 | } |
| 497 | #ifdef __linux__ |
| 498 | /* PPP addresses on Linux don't have hardware addresses */ |
| 499 | else |
| 500 | ifp->index = if_nametoindex(ifp->name); |
| 501 | #endif |
| 502 | |
| 503 | /* We only work on ethernet by default */ |
| 504 | if (ifp->family != ARPHRD_ETHER) { |
| 505 | if ((argc == 0 || argc == -1) && |
| 506 | ctx->ifac == 0 && !if_hasconf(ctx, ifp->name)) |
| 507 | { |
| 508 | if_free(ifp); |
| 509 | continue; |
| 510 | } |
| 511 | switch (ifp->family) { |
| 512 | case ARPHRD_IEEE1394: |
| 513 | case ARPHRD_INFINIBAND: |
| 514 | #ifdef ARPHRD_LOOPBACK |
| 515 | case ARPHRD_LOOPBACK: |
| 516 | #endif |
| 517 | #ifdef ARPHRD_PPP |
| 518 | case ARPHRD_PPP: |
| 519 | #endif |
| 520 | /* We don't warn for supported families */ |
| 521 | break; |
| 522 | |
| 523 | /* IFT already checked */ |
| 524 | #ifndef AF_LINK |
| 525 | default: |
| 526 | logger(ifp->ctx, LOG_WARNING, |
| 527 | "%s: unsupported interface family %.2x", |
| 528 | ifp->name, ifp->family); |
| 529 | break; |
| 530 | #endif |
| 531 | } |
| 532 | } |
| 533 | |
| 534 | /* Handle any platform init for the interface */ |
| 535 | if (if_init(ifp) == -1) { |
| 536 | logger(ifp->ctx, LOG_ERR, "%s: if_init: %m", p); |
| 537 | if_free(ifp); |
| 538 | continue; |
| 539 | } |
| 540 | |
| 541 | /* Ensure that the MTU is big enough for DHCP */ |
| 542 | if (if_getmtu(ifp->name) < MTU_MIN && |
| 543 | if_setmtu(ifp->name, MTU_MIN) == -1) |
| 544 | { |
| 545 | logger(ifp->ctx, LOG_ERR, "%s: set_mtu: %m", p); |
| 546 | if_free(ifp); |
| 547 | continue; |
| 548 | } |
| 549 | |
| 550 | #ifdef SIOCGIFPRIORITY |
| 551 | /* Respect the interface priority */ |
| 552 | memset(&ifr, 0, sizeof(ifr)); |
| 553 | strlcpy(ifr.ifr_name, ifp->name, sizeof(ifr.ifr_name)); |
| 554 | if (ioctl(s_inet, SIOCGIFPRIORITY, &ifr) == 0) |
| 555 | ifp->metric = ifr.ifr_metric; |
| 556 | #else |
| 557 | /* We reserve the 100 range for virtual interfaces, if and when |
| 558 | * we can work them out. */ |
| 559 | ifp->metric = 200 + ifp->index; |
| 560 | if (if_getssid(ifp) != -1) { |
| 561 | ifp->wireless = 1; |
| 562 | ifp->metric += 100; |
| 563 | } |
| 564 | #endif |
| 565 | |
| 566 | TAILQ_INSERT_TAIL(ifs, ifp, next); |
| 567 | } |
| 568 | |
Samuel Tan | 24aa62e | 2015-08-13 17:12:30 -0700 | [diff] [blame] | 569 | if (!ifs) { |
| 570 | logger(ctx, LOG_INFO, "%s: no matching interfaces", __func__); |
| 571 | for (ifa = ifaddrs; ifa; ifa = ifa->ifa_next) { |
| 572 | logger(ctx, LOG_INFO, "%s: considered %s", |
| 573 | __func__, ifa->ifa_name); |
| 574 | } |
| 575 | } |
| 576 | |
Samuel Tan | d7ed851 | 2015-08-13 16:11:35 -0700 | [diff] [blame] | 577 | if_learnaddrs1(ctx, ifs, ifaddrs); |
| 578 | freeifaddrs(ifaddrs); |
| 579 | |
| 580 | #ifdef SIOCGIFPRIORITY |
| 581 | close(s_inet); |
| 582 | #endif |
| 583 | #ifdef IFLR_ACTIVE |
| 584 | close(s_link); |
| 585 | #endif |
| 586 | |
| 587 | return ifs; |
| 588 | } |
| 589 | |
| 590 | static struct interface * |
| 591 | if_findindexname(struct if_head *ifaces, unsigned int idx, const char *name) |
| 592 | { |
| 593 | |
| 594 | if (ifaces != NULL) { |
| 595 | struct interface *ifp; |
| 596 | |
| 597 | TAILQ_FOREACH(ifp, ifaces, next) { |
| 598 | if ((ifp->options == NULL || |
| 599 | !(ifp->options->options & DHCPCD_PFXDLGONLY)) && |
| 600 | ((name && strcmp(ifp->name, name) == 0) || |
| 601 | #ifdef __linux__ |
| 602 | (name && strcmp(ifp->alias, name) == 0) || |
| 603 | #endif |
| 604 | (!name && ifp->index == idx))) |
| 605 | return ifp; |
| 606 | } |
| 607 | } |
| 608 | |
| 609 | errno = ESRCH; |
| 610 | return NULL; |
| 611 | } |
| 612 | |
| 613 | struct interface * |
| 614 | if_find(struct if_head *ifaces, const char *name) |
| 615 | { |
| 616 | |
| 617 | return if_findindexname(ifaces, 0, name); |
| 618 | } |
| 619 | |
| 620 | struct interface * |
| 621 | if_findindex(struct if_head *ifaces, unsigned int idx) |
| 622 | { |
| 623 | |
| 624 | return if_findindexname(ifaces, idx, NULL); |
| 625 | } |
| 626 | |
| 627 | int |
| 628 | if_domtu(const char *ifname, short int mtu) |
| 629 | { |
| 630 | int s, r; |
| 631 | struct ifreq ifr; |
| 632 | |
| 633 | if ((s = socket(PF_INET, SOCK_DGRAM, 0)) == -1) |
| 634 | return -1; |
| 635 | memset(&ifr, 0, sizeof(ifr)); |
| 636 | strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name)); |
| 637 | ifr.ifr_mtu = mtu; |
| 638 | r = ioctl(s, mtu ? SIOCSIFMTU : SIOCGIFMTU, &ifr); |
| 639 | close(s); |
| 640 | if (r == -1) |
| 641 | return -1; |
| 642 | return ifr.ifr_mtu; |
| 643 | } |
| 644 | |
| 645 | /* Interface comparer for working out ordering. */ |
| 646 | static int |
| 647 | if_cmp(const struct interface *si, const struct interface *ti) |
| 648 | { |
| 649 | #ifdef INET |
| 650 | int r; |
| 651 | #endif |
| 652 | |
| 653 | /* Always prefer master interfaces */ |
| 654 | if (!(si->options->options & DHCPCD_PFXDLGONLY) && |
| 655 | ti->options->options & DHCPCD_PFXDLGONLY) |
| 656 | return -1; |
| 657 | if (si->options->options & DHCPCD_PFXDLGONLY && |
| 658 | !(ti->options->options & DHCPCD_PFXDLGONLY)) |
| 659 | return 1; |
| 660 | |
| 661 | /* Check carrier status first */ |
| 662 | if (si->carrier > ti->carrier) |
| 663 | return -1; |
| 664 | if (si->carrier < ti->carrier) |
| 665 | return 1; |
| 666 | |
| 667 | if (D_STATE_RUNNING(si) && !D_STATE_RUNNING(ti)) |
| 668 | return -1; |
| 669 | if (!D_STATE_RUNNING(si) && D_STATE_RUNNING(ti)) |
| 670 | return 1; |
| 671 | if (RS_STATE_RUNNING(si) && !RS_STATE_RUNNING(ti)) |
| 672 | return -1; |
| 673 | if (!RS_STATE_RUNNING(si) && RS_STATE_RUNNING(ti)) |
| 674 | return 1; |
| 675 | if (D6_STATE_RUNNING(si) && !D6_STATE_RUNNING(ti)) |
| 676 | return -1; |
| 677 | if (!D6_STATE_RUNNING(si) && D6_STATE_RUNNING(ti)) |
| 678 | return 1; |
| 679 | |
| 680 | #ifdef INET |
| 681 | /* Special attention needed here due to states and IPv4LL. */ |
| 682 | if ((r = ipv4_ifcmp(si, ti)) != 0) |
| 683 | return r; |
| 684 | #endif |
| 685 | |
| 686 | /* Finally, metric */ |
| 687 | if (si->metric < ti->metric) |
| 688 | return -1; |
| 689 | if (si->metric > ti->metric) |
| 690 | return 1; |
| 691 | return 0; |
| 692 | } |
| 693 | |
| 694 | /* Sort the interfaces into a preferred order - best first, worst last. */ |
| 695 | void |
| 696 | if_sortinterfaces(struct dhcpcd_ctx *ctx) |
| 697 | { |
| 698 | struct if_head sorted; |
| 699 | struct interface *ifp, *ift; |
| 700 | |
| 701 | if (ctx->ifaces == NULL || |
| 702 | (ifp = TAILQ_FIRST(ctx->ifaces)) == NULL || |
| 703 | TAILQ_NEXT(ifp, next) == NULL) |
| 704 | return; |
| 705 | |
| 706 | TAILQ_INIT(&sorted); |
| 707 | TAILQ_REMOVE(ctx->ifaces, ifp, next); |
| 708 | TAILQ_INSERT_HEAD(&sorted, ifp, next); |
| 709 | while ((ifp = TAILQ_FIRST(ctx->ifaces))) { |
| 710 | TAILQ_REMOVE(ctx->ifaces, ifp, next); |
| 711 | TAILQ_FOREACH(ift, &sorted, next) { |
| 712 | if (if_cmp(ifp, ift) == -1) { |
| 713 | TAILQ_INSERT_BEFORE(ift, ifp, next); |
| 714 | break; |
| 715 | } |
| 716 | } |
| 717 | if (ift == NULL) |
| 718 | TAILQ_INSERT_TAIL(&sorted, ifp, next); |
| 719 | } |
| 720 | TAILQ_CONCAT(ctx->ifaces, &sorted, next); |
| 721 | } |