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 <asm/types.h> /* Needed for 2.4 kernels */ |
| 29 | |
| 30 | #include <sys/types.h> |
| 31 | #include <sys/socket.h> |
| 32 | #include <sys/ioctl.h> |
| 33 | #include <sys/param.h> |
| 34 | |
| 35 | #include <linux/if_addr.h> |
| 36 | #include <linux/if_link.h> |
| 37 | #include <linux/if_packet.h> |
| 38 | #include <linux/filter.h> |
| 39 | #include <linux/netlink.h> |
| 40 | #include <linux/rtnetlink.h> |
| 41 | |
| 42 | #include <arpa/inet.h> |
| 43 | #include <net/if.h> |
| 44 | #include <netinet/if_ether.h> |
| 45 | #include <netinet/in_systm.h> |
| 46 | #include <netinet/in.h> |
| 47 | #include <net/route.h> |
| 48 | |
| 49 | /* Support older kernels */ |
| 50 | #ifndef IFLA_WIRELESS |
| 51 | # define IFLA_WIRELESS (IFLA_MASTER + 1) |
| 52 | #endif |
| 53 | |
| 54 | /* Linux has these in an enum and there is just no way to work |
| 55 | * out of they exist at compile time. Silly silly silly. */ |
| 56 | #define IFLA_AF_SPEC 26 |
| 57 | #define IFLA_INET6_ADDR_GEN_MODE 8 |
| 58 | #define IN6_ADDR_GEN_MODE_NONE 1 |
| 59 | |
| 60 | /* For some reason, glibc doesn't include newer flags from linux/if.h |
| 61 | * However, we cannot include linux/if.h directly as it conflicts |
| 62 | * with the glibc version. D'oh! */ |
| 63 | #ifndef IFF_LOWER_UP |
| 64 | #define IFF_LOWER_UP 0x10000 /* driver signals L1 up */ |
| 65 | #endif |
| 66 | |
| 67 | #include <errno.h> |
| 68 | #include <fcntl.h> |
| 69 | #include <ctype.h> |
| 70 | #include <stddef.h> |
| 71 | #include <stdio.h> |
| 72 | #include <stdlib.h> |
| 73 | #include <string.h> |
| 74 | #include <time.h> |
| 75 | #include <unistd.h> |
| 76 | |
| 77 | #include "config.h" |
| 78 | #include "common.h" |
| 79 | #include "dev.h" |
| 80 | #include "dhcp.h" |
| 81 | #include "if.h" |
| 82 | #include "ipv4.h" |
| 83 | #include "ipv6.h" |
| 84 | #include "ipv6nd.h" |
| 85 | |
| 86 | #ifdef HAVE_NL80211_H |
| 87 | #include <linux/genetlink.h> |
| 88 | #include <linux/nl80211.h> |
| 89 | #endif |
| 90 | int if_getssid_wext(const char *ifname, uint8_t *ssid); |
| 91 | |
| 92 | #define bpf_insn sock_filter |
| 93 | #define BPF_SKIPTYPE |
| 94 | #define BPF_ETHCOOK -ETH_HLEN |
| 95 | #define BPF_WHOLEPACKET 0x0fffffff /* work around buggy LPF filters */ |
| 96 | |
| 97 | #include "bpf-filter.h" |
| 98 | |
| 99 | /* Broadcast address for IPoIB */ |
| 100 | static const uint8_t ipv4_bcast_addr[] = { |
| 101 | 0x00, 0xff, 0xff, 0xff, |
| 102 | 0xff, 0x12, 0x40, 0x1b, 0x00, 0x00, 0x00, 0x00, |
| 103 | 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff |
| 104 | }; |
| 105 | |
| 106 | #define PROC_INET6 "/proc/net/if_inet6" |
| 107 | #define PROC_PROMOTE "/proc/sys/net/ipv4/conf/%s/promote_secondaries" |
| 108 | #define SYS_LAYER2 "/sys/class/net/%s/device/layer2" |
| 109 | |
| 110 | static const char *mproc = |
| 111 | #if defined(__alpha__) |
| 112 | "system type" |
| 113 | #elif defined(__arm__) |
| 114 | "Hardware" |
| 115 | #elif defined(__avr32__) |
| 116 | "cpu family" |
| 117 | #elif defined(__bfin__) |
| 118 | "BOARD Name" |
| 119 | #elif defined(__cris__) |
| 120 | "cpu model" |
| 121 | #elif defined(__frv__) |
| 122 | "System" |
| 123 | #elif defined(__i386__) || defined(__x86_64__) |
| 124 | "vendor_id" |
| 125 | #elif defined(__ia64__) |
| 126 | "vendor" |
| 127 | #elif defined(__hppa__) |
| 128 | "model" |
| 129 | #elif defined(__m68k__) |
| 130 | "MMU" |
| 131 | #elif defined(__mips__) |
| 132 | "system type" |
| 133 | #elif defined(__powerpc__) || defined(__powerpc64__) |
| 134 | "machine" |
| 135 | #elif defined(__s390__) || defined(__s390x__) |
| 136 | "Manufacturer" |
| 137 | #elif defined(__sh__) |
| 138 | "machine" |
| 139 | #elif defined(sparc) || defined(__sparc__) |
| 140 | "cpu" |
| 141 | #elif defined(__vax__) |
| 142 | "cpu" |
| 143 | #else |
| 144 | NULL |
| 145 | #endif |
| 146 | ; |
| 147 | |
| 148 | int |
| 149 | if_machinearch(char *str, size_t len) |
| 150 | { |
| 151 | FILE *fp; |
| 152 | char buf[256]; |
| 153 | |
| 154 | if (mproc == NULL) { |
| 155 | errno = EINVAL; |
| 156 | return -1; |
| 157 | } |
| 158 | |
| 159 | fp = fopen("/proc/cpuinfo", "r"); |
| 160 | if (fp == NULL) |
| 161 | return -1; |
| 162 | |
| 163 | while (fscanf(fp, "%255s : ", buf) != EOF) { |
| 164 | if (strncmp(buf, mproc, strlen(mproc)) == 0 && |
| 165 | fscanf(fp, "%255s", buf) == 1) |
| 166 | { |
| 167 | fclose(fp); |
| 168 | return snprintf(str, len, ":%s", buf); |
| 169 | } |
| 170 | } |
| 171 | fclose(fp); |
| 172 | errno = ESRCH; |
| 173 | return -1; |
| 174 | } |
| 175 | |
| 176 | static int |
| 177 | check_proc_int(const char *path) |
| 178 | { |
| 179 | FILE *fp; |
| 180 | int i; |
| 181 | |
| 182 | fp = fopen(path, "r"); |
| 183 | if (fp == NULL) |
| 184 | return -1; |
| 185 | if (fscanf(fp, "%d", &i) != 1) |
| 186 | i = -1; |
| 187 | fclose(fp); |
| 188 | return i; |
| 189 | } |
| 190 | |
| 191 | static ssize_t |
| 192 | write_path(const char *path, const char *val) |
| 193 | { |
| 194 | FILE *fp; |
| 195 | ssize_t r; |
| 196 | |
| 197 | fp = fopen(path, "w"); |
| 198 | if (fp == NULL) |
| 199 | return -1; |
| 200 | r = fprintf(fp, "%s\n", val); |
| 201 | fclose(fp); |
| 202 | return r; |
| 203 | } |
| 204 | |
| 205 | int |
| 206 | if_init(struct interface *ifp) |
| 207 | { |
| 208 | char path[sizeof(PROC_PROMOTE) + IF_NAMESIZE]; |
| 209 | int n; |
| 210 | |
| 211 | /* We enable promote_secondaries so that we can do this |
| 212 | * add 192.168.1.2/24 |
| 213 | * add 192.168.1.3/24 |
| 214 | * del 192.168.1.2/24 |
| 215 | * and the subnet mask moves onto 192.168.1.3/24 |
| 216 | * This matches the behaviour of BSD which makes coding dhcpcd |
| 217 | * a little easier as there's just one behaviour. */ |
| 218 | snprintf(path, sizeof(path), PROC_PROMOTE, ifp->name); |
| 219 | n = check_proc_int(path); |
| 220 | if (n == -1) |
| 221 | return errno == ENOENT ? 0 : -1; |
| 222 | if (n == 1) |
| 223 | return 0; |
| 224 | return write_path(path, "1") == -1 ? -1 : 0; |
| 225 | } |
| 226 | |
| 227 | int |
| 228 | if_conf(struct interface *ifp) |
| 229 | { |
| 230 | char path[sizeof(SYS_LAYER2) + IF_NAMESIZE]; |
| 231 | int n; |
| 232 | |
| 233 | /* Some qeth setups require the use of the broadcast flag. */ |
| 234 | snprintf(path, sizeof(path), SYS_LAYER2, ifp->name); |
| 235 | n = check_proc_int(path); |
| 236 | if (n == -1) |
| 237 | return errno == ENOENT ? 0 : -1; |
| 238 | if (n == 0) |
| 239 | ifp->options->options |= DHCPCD_BROADCAST; |
| 240 | return 0; |
| 241 | } |
| 242 | |
| 243 | /* XXX work out Virtal Interface Masters */ |
| 244 | int |
| 245 | if_vimaster(__unused const char *ifname) |
| 246 | { |
| 247 | |
| 248 | return 0; |
| 249 | } |
| 250 | |
| 251 | static int |
| 252 | _open_link_socket(struct sockaddr_nl *nl, int flags, int protocol) |
| 253 | { |
| 254 | int fd; |
| 255 | |
| 256 | #ifdef SOCK_CLOEXEC |
| 257 | if (flags) |
| 258 | flags = SOCK_CLOEXEC; |
| 259 | fd = socket(AF_NETLINK, SOCK_RAW | flags, protocol); |
| 260 | if (fd == -1) |
| 261 | return -1; |
| 262 | #else |
| 263 | fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE); |
| 264 | if (fd == -1) |
| 265 | return -1; |
| 266 | if (flags && |
| 267 | (flags = fcntl(fd, F_GETFD, 0)) == -1 || |
| 268 | fcntl(fd, F_SETFD, flags | FD_CLOEXEC) == -1) |
| 269 | { |
| 270 | close(fd); |
| 271 | return -1; |
| 272 | } |
| 273 | #endif |
| 274 | nl->nl_family = AF_NETLINK; |
| 275 | if (bind(fd, (struct sockaddr *)nl, sizeof(*nl)) == -1) { |
| 276 | close(fd); |
| 277 | return -1; |
| 278 | } |
| 279 | return fd; |
| 280 | } |
| 281 | |
| 282 | int |
| 283 | if_openlinksocket(void) |
| 284 | { |
| 285 | struct sockaddr_nl snl; |
| 286 | |
| 287 | memset(&snl, 0, sizeof(snl)); |
| 288 | snl.nl_groups = RTMGRP_LINK; |
| 289 | |
| 290 | #ifdef INET |
| 291 | snl.nl_groups |= RTMGRP_IPV4_ROUTE | RTMGRP_IPV4_IFADDR; |
| 292 | #endif |
| 293 | #ifdef INET6 |
| 294 | snl.nl_groups |= RTMGRP_IPV6_ROUTE | RTMGRP_IPV6_IFADDR | RTMGRP_NEIGH; |
| 295 | #endif |
| 296 | |
| 297 | return _open_link_socket(&snl, 1, NETLINK_ROUTE); |
| 298 | } |
| 299 | |
| 300 | static int |
| 301 | err_netlink(struct nlmsghdr *nlm) |
| 302 | { |
| 303 | struct nlmsgerr *err; |
| 304 | size_t len; |
| 305 | |
| 306 | if (nlm->nlmsg_type != NLMSG_ERROR) |
| 307 | return 0; |
| 308 | len = nlm->nlmsg_len - sizeof(*nlm); |
| 309 | if (len < sizeof(*err)) { |
| 310 | errno = EBADMSG; |
| 311 | return -1; |
| 312 | } |
| 313 | err = (struct nlmsgerr *)NLMSG_DATA(nlm); |
| 314 | if (err->error == 0) |
| 315 | return (int)len; |
| 316 | errno = -err->error; |
| 317 | return -1; |
| 318 | } |
| 319 | |
| 320 | static int |
| 321 | get_netlink(struct dhcpcd_ctx *ctx, struct interface *ifp, int fd, int flags, |
| 322 | int (*callback)(struct dhcpcd_ctx *, struct interface *, struct nlmsghdr *)) |
| 323 | { |
| 324 | char *buf = NULL, *nbuf; |
| 325 | ssize_t bytes; |
| 326 | size_t buflen; |
| 327 | struct nlmsghdr *nlm; |
| 328 | struct sockaddr_nl nladdr; |
| 329 | socklen_t nladdr_len; |
| 330 | int r; |
| 331 | |
| 332 | buflen = 0; |
| 333 | r = -1; |
| 334 | for (;;) { |
| 335 | bytes = recv(fd, NULL, 0, |
| 336 | flags | MSG_PEEK | MSG_DONTWAIT | MSG_TRUNC); |
| 337 | if (bytes == -1) |
| 338 | goto eexit; |
| 339 | if ((size_t)bytes == buflen) { |
| 340 | /* Support kernels older than 2.6.22 */ |
| 341 | if (bytes == 0) |
| 342 | bytes = 512; |
| 343 | else |
| 344 | bytes *= 2; |
| 345 | } |
| 346 | if (buflen < (size_t)bytes) { |
| 347 | /* Alloc 1 more so we work with older kernels */ |
| 348 | buflen = (size_t)bytes + 1; |
| 349 | nbuf = realloc(buf, buflen); |
| 350 | if (nbuf == NULL) |
| 351 | goto eexit; |
| 352 | buf = nbuf; |
| 353 | } |
| 354 | nladdr_len = sizeof(nladdr); |
| 355 | bytes = recvfrom(fd, buf, buflen, flags, |
| 356 | (struct sockaddr *)&nladdr, &nladdr_len); |
| 357 | if (bytes == -1 || bytes == 0) |
| 358 | goto eexit; |
| 359 | |
| 360 | /* Check sender */ |
| 361 | if (nladdr_len != sizeof(nladdr)) { |
| 362 | errno = EINVAL; |
| 363 | goto eexit; |
| 364 | } |
| 365 | /* Ignore message if it is not from kernel */ |
| 366 | if (nladdr.nl_pid != 0) { |
| 367 | r = 0; |
| 368 | continue; |
| 369 | } |
| 370 | |
| 371 | for (nlm = (struct nlmsghdr *)(void *)buf; |
| 372 | nlm && NLMSG_OK(nlm, (size_t)bytes); |
| 373 | nlm = NLMSG_NEXT(nlm, bytes)) |
| 374 | { |
| 375 | r = err_netlink(nlm); |
| 376 | if (r == -1) |
| 377 | goto eexit; |
| 378 | if (r) |
| 379 | continue; |
| 380 | if (callback) { |
| 381 | r = callback(ctx, ifp, nlm); |
| 382 | if (r != 0) |
| 383 | goto eexit; |
| 384 | } |
| 385 | } |
| 386 | } |
| 387 | |
| 388 | eexit: |
| 389 | free(buf); |
| 390 | return r; |
| 391 | } |
| 392 | |
| 393 | #ifdef INET |
| 394 | static int |
| 395 | if_copyrt(struct dhcpcd_ctx *ctx, struct rt *rt, struct nlmsghdr *nlm) |
| 396 | { |
| 397 | size_t len; |
| 398 | struct rtmsg *rtm; |
| 399 | struct rtattr *rta; |
| 400 | struct in_addr prefsrc; |
| 401 | |
| 402 | len = nlm->nlmsg_len - sizeof(*nlm); |
| 403 | if (len < sizeof(*rtm)) { |
| 404 | errno = EBADMSG; |
| 405 | return -1; |
| 406 | } |
| 407 | rtm = (struct rtmsg *)NLMSG_DATA(nlm); |
| 408 | if (rtm->rtm_table != RT_TABLE_MAIN || rtm->rtm_family != AF_INET) |
| 409 | return -1; |
| 410 | |
| 411 | memset(rt, 0, sizeof(*rt)); |
| 412 | if (rtm->rtm_type == RTN_UNREACHABLE) |
| 413 | rt->flags = RTF_REJECT; |
| 414 | if (rtm->rtm_scope == RT_SCOPE_HOST) |
| 415 | rt->flags |= RTF_HOST; |
| 416 | |
| 417 | prefsrc.s_addr = INADDR_ANY; |
| 418 | rta = (struct rtattr *)RTM_RTA(rtm); |
| 419 | len = RTM_PAYLOAD(nlm); |
| 420 | while (RTA_OK(rta, len)) { |
| 421 | switch (rta->rta_type) { |
| 422 | case RTA_DST: |
| 423 | memcpy(&rt->dest.s_addr, RTA_DATA(rta), |
| 424 | sizeof(rt->dest.s_addr)); |
| 425 | break; |
| 426 | case RTA_GATEWAY: |
| 427 | memcpy(&rt->gate.s_addr, RTA_DATA(rta), |
| 428 | sizeof(rt->gate.s_addr)); |
| 429 | break; |
| 430 | case RTA_PREFSRC: |
| 431 | memcpy(&prefsrc.s_addr, RTA_DATA(rta), |
| 432 | sizeof(prefsrc.s_addr)); |
| 433 | break; |
| 434 | case RTA_OIF: |
| 435 | rt->iface = if_findindex(ctx->ifaces, |
| 436 | *(unsigned int *)RTA_DATA(rta)); |
| 437 | break; |
| 438 | case RTA_PRIORITY: |
| 439 | rt->metric = *(unsigned int *)RTA_DATA(rta); |
| 440 | break; |
| 441 | } |
| 442 | rta = RTA_NEXT(rta, len); |
| 443 | } |
| 444 | |
| 445 | inet_cidrtoaddr(rtm->rtm_dst_len, &rt->net); |
| 446 | if (rt->iface == NULL && prefsrc.s_addr != INADDR_ANY) { |
| 447 | struct ipv4_addr *ap; |
| 448 | |
| 449 | /* For some reason the default route comes back with the |
| 450 | * loopback interface in RTA_OIF? Lets find it by |
| 451 | * preferred source address */ |
| 452 | if ((ap = ipv4_findaddr(ctx, &prefsrc))) |
| 453 | rt->iface = ap->iface; |
| 454 | } |
| 455 | return 0; |
| 456 | } |
| 457 | #endif |
| 458 | |
| 459 | #ifdef INET6 |
| 460 | static int |
| 461 | if_copyrt6(struct dhcpcd_ctx *ctx, struct rt6 *rt, struct nlmsghdr *nlm) |
| 462 | { |
| 463 | size_t len; |
| 464 | struct rtmsg *rtm; |
| 465 | struct rtattr *rta; |
| 466 | |
| 467 | len = nlm->nlmsg_len - sizeof(*nlm); |
| 468 | if (len < sizeof(*rtm)) { |
| 469 | errno = EBADMSG; |
| 470 | return -1; |
| 471 | } |
| 472 | rtm = (struct rtmsg *)NLMSG_DATA(nlm); |
| 473 | if (rtm->rtm_table != RT_TABLE_MAIN || rtm->rtm_family != AF_INET6) |
| 474 | return -1; |
| 475 | |
| 476 | memset(rt, 0, sizeof(*rt)); |
| 477 | if (rtm->rtm_type == RTN_UNREACHABLE) |
| 478 | rt->flags = RTF_REJECT; |
| 479 | if (rtm->rtm_scope == RT_SCOPE_HOST) |
| 480 | rt->flags |= RTF_HOST; |
| 481 | ipv6_mask(&rt->net, rtm->rtm_dst_len); |
| 482 | |
| 483 | rta = (struct rtattr *)RTM_RTA(rtm); |
| 484 | len = RTM_PAYLOAD(nlm); |
| 485 | while (RTA_OK(rta, len)) { |
| 486 | switch (rta->rta_type) { |
| 487 | case RTA_DST: |
| 488 | memcpy(&rt->dest.s6_addr, RTA_DATA(rta), |
| 489 | sizeof(rt->dest.s6_addr)); |
| 490 | break; |
| 491 | case RTA_GATEWAY: |
| 492 | memcpy(&rt->gate.s6_addr, RTA_DATA(rta), |
| 493 | sizeof(rt->gate.s6_addr)); |
| 494 | break; |
| 495 | case RTA_OIF: |
| 496 | rt->iface = if_findindex(ctx->ifaces, |
| 497 | *(unsigned int *)RTA_DATA(rta)); |
| 498 | break; |
| 499 | case RTA_PRIORITY: |
| 500 | rt->metric = *(unsigned int *)RTA_DATA(rta); |
| 501 | break; |
| 502 | } |
| 503 | rta = RTA_NEXT(rta, len); |
| 504 | } |
| 505 | |
| 506 | return 0; |
| 507 | } |
| 508 | #endif |
| 509 | |
| 510 | /* Work out the maximum pid size */ |
| 511 | static inline long long |
| 512 | get_max_pid_t() |
| 513 | { |
| 514 | |
| 515 | if (sizeof(pid_t) == sizeof(short)) return SHRT_MAX; |
| 516 | if (sizeof(pid_t) == sizeof(int)) return INT_MAX; |
| 517 | if (sizeof(pid_t) == sizeof(long)) return LONG_MAX; |
| 518 | if (sizeof(pid_t) == sizeof(long long)) return LLONG_MAX; |
| 519 | abort(); |
| 520 | } |
| 521 | |
| 522 | static int |
| 523 | link_route(struct dhcpcd_ctx *ctx, __unused struct interface *ifp, |
| 524 | struct nlmsghdr *nlm) |
| 525 | { |
| 526 | size_t len; |
| 527 | struct rtmsg *rtm; |
| 528 | int cmd; |
| 529 | #ifdef INET |
| 530 | struct rt rt; |
| 531 | #endif |
| 532 | #ifdef INET6 |
| 533 | struct rt6 rt6; |
| 534 | #endif |
| 535 | switch (nlm->nlmsg_type) { |
| 536 | case RTM_NEWROUTE: |
| 537 | cmd = RTM_ADD; |
| 538 | break; |
| 539 | case RTM_DELROUTE: |
| 540 | cmd = RTM_DELETE; |
| 541 | break; |
| 542 | default: |
| 543 | return 0; |
| 544 | } |
| 545 | |
| 546 | len = nlm->nlmsg_len - sizeof(*nlm); |
| 547 | if (len < sizeof(*rtm)) { |
| 548 | errno = EBADMSG; |
| 549 | return -1; |
| 550 | } |
| 551 | |
| 552 | /* Ignore messages generated by us. |
| 553 | * For some reason we get messages generated by us |
| 554 | * with a very large value in nlmsg_pid that seems to be |
| 555 | * sequentially changing. Is there a better test for this? */ |
| 556 | if (nlm->nlmsg_pid > get_max_pid_t()) |
| 557 | return 1; |
| 558 | |
| 559 | rtm = NLMSG_DATA(nlm); |
| 560 | switch (rtm->rtm_family) { |
| 561 | #ifdef INET |
| 562 | case AF_INET: |
| 563 | if (if_copyrt(ctx, &rt, nlm) == 0) |
| 564 | ipv4_handlert(ctx, cmd, &rt); |
| 565 | break; |
| 566 | #endif |
| 567 | #ifdef INET6 |
| 568 | case AF_INET6: |
| 569 | if (if_copyrt6(ctx, &rt6, nlm) == 0) |
| 570 | ipv6_handlert(ctx, cmd, &rt6); |
| 571 | break; |
| 572 | #endif |
| 573 | } |
| 574 | |
| 575 | return 0; |
| 576 | } |
| 577 | |
| 578 | static int |
| 579 | link_addr(struct dhcpcd_ctx *ctx, struct interface *ifp, struct nlmsghdr *nlm) |
| 580 | { |
| 581 | size_t len; |
| 582 | struct rtattr *rta; |
| 583 | struct ifaddrmsg *ifa; |
| 584 | #ifdef INET |
| 585 | struct in_addr addr, net, dest; |
| 586 | #endif |
| 587 | #ifdef INET6 |
| 588 | struct in6_addr addr6; |
| 589 | #endif |
| 590 | |
| 591 | if (nlm->nlmsg_type != RTM_DELADDR && nlm->nlmsg_type != RTM_NEWADDR) |
| 592 | return 0; |
| 593 | |
| 594 | len = nlm->nlmsg_len - sizeof(*nlm); |
| 595 | if (len < sizeof(*ifa)) { |
| 596 | errno = EBADMSG; |
| 597 | return -1; |
| 598 | } |
| 599 | ifa = NLMSG_DATA(nlm); |
| 600 | if ((ifp = if_findindex(ctx->ifaces, ifa->ifa_index)) == NULL) { |
| 601 | /* We don't know about the interface the address is for |
| 602 | * so it's not really an error */ |
| 603 | return 1; |
| 604 | } |
| 605 | rta = (struct rtattr *)IFA_RTA(ifa); |
| 606 | len = NLMSG_PAYLOAD(nlm, sizeof(*ifa)); |
| 607 | switch (ifa->ifa_family) { |
| 608 | #ifdef INET |
| 609 | case AF_INET: |
| 610 | addr.s_addr = dest.s_addr = INADDR_ANY; |
| 611 | dest.s_addr = INADDR_ANY; |
| 612 | inet_cidrtoaddr(ifa->ifa_prefixlen, &net); |
| 613 | while (RTA_OK(rta, len)) { |
| 614 | switch (rta->rta_type) { |
| 615 | case IFA_ADDRESS: |
| 616 | if (ifp->flags & IFF_POINTOPOINT) { |
| 617 | memcpy(&dest.s_addr, RTA_DATA(rta), |
| 618 | sizeof(addr.s_addr)); |
| 619 | } |
| 620 | break; |
| 621 | case IFA_LOCAL: |
| 622 | memcpy(&addr.s_addr, RTA_DATA(rta), |
| 623 | sizeof(addr.s_addr)); |
| 624 | break; |
| 625 | } |
| 626 | rta = RTA_NEXT(rta, len); |
| 627 | } |
| 628 | ipv4_handleifa(ctx, nlm->nlmsg_type, NULL, ifp->name, |
| 629 | &addr, &net, &dest, ifa->ifa_flags); |
| 630 | break; |
| 631 | #endif |
| 632 | #ifdef INET6 |
| 633 | case AF_INET6: |
| 634 | memset(&addr6, 0, sizeof(addr6)); |
| 635 | while (RTA_OK(rta, len)) { |
| 636 | switch (rta->rta_type) { |
| 637 | case IFA_ADDRESS: |
| 638 | memcpy(&addr6.s6_addr, RTA_DATA(rta), |
| 639 | sizeof(addr6.s6_addr)); |
| 640 | break; |
| 641 | } |
| 642 | rta = RTA_NEXT(rta, len); |
| 643 | } |
| 644 | ipv6_handleifa(ctx, nlm->nlmsg_type, NULL, ifp->name, |
| 645 | &addr6, ifa->ifa_prefixlen, ifa->ifa_flags); |
| 646 | break; |
| 647 | #endif |
| 648 | } |
| 649 | return 0; |
| 650 | } |
| 651 | |
| 652 | static uint8_t |
| 653 | l2addr_len(unsigned short if_type) |
| 654 | { |
| 655 | |
| 656 | switch (if_type) { |
| 657 | case ARPHRD_ETHER: /* FALLTHROUGH */ |
| 658 | case ARPHRD_IEEE802: /*FALLTHROUGH */ |
| 659 | case ARPHRD_IEEE80211: |
| 660 | return 6; |
| 661 | case ARPHRD_IEEE1394: |
| 662 | return 8; |
| 663 | case ARPHRD_INFINIBAND: |
| 664 | return 20; |
| 665 | } |
| 666 | |
| 667 | /* Impossible */ |
| 668 | return 0; |
| 669 | } |
| 670 | |
| 671 | static int |
| 672 | handle_rename(struct dhcpcd_ctx *ctx, unsigned int ifindex, const char *ifname) |
| 673 | { |
| 674 | struct interface *ifp; |
| 675 | |
| 676 | TAILQ_FOREACH(ifp, ctx->ifaces, next) { |
| 677 | if (ifp->index == ifindex && strcmp(ifp->name, ifname)) { |
| 678 | dhcpcd_handleinterface(ctx, -1, ifp->name); |
| 679 | /* Let dev announce the interface for renaming */ |
| 680 | if (!dev_listening(ctx)) |
| 681 | dhcpcd_handleinterface(ctx, 1, ifname); |
| 682 | return 1; |
| 683 | } |
| 684 | } |
| 685 | return 0; |
| 686 | } |
| 687 | |
| 688 | #ifdef INET6 |
| 689 | static int |
| 690 | link_neigh(struct dhcpcd_ctx *ctx, __unused struct interface *ifp, |
| 691 | struct nlmsghdr *nlm) |
| 692 | { |
| 693 | struct ndmsg *r; |
| 694 | struct rtattr *rta; |
| 695 | size_t len; |
| 696 | struct in6_addr addr6; |
| 697 | int flags; |
| 698 | |
| 699 | if (nlm->nlmsg_type != RTM_NEWNEIGH && nlm->nlmsg_type != RTM_DELNEIGH) |
| 700 | return 0; |
| 701 | if (nlm->nlmsg_len < sizeof(*r)) |
| 702 | return -1; |
| 703 | |
| 704 | r = NLMSG_DATA(nlm); |
| 705 | rta = (struct rtattr *)RTM_RTA(r); |
| 706 | len = RTM_PAYLOAD(nlm); |
| 707 | if (r->ndm_family == AF_INET6) { |
| 708 | flags = 0; |
| 709 | if (r->ndm_flags & NTF_ROUTER) |
| 710 | flags |= IPV6ND_ROUTER; |
| 711 | if (nlm->nlmsg_type == RTM_NEWNEIGH && |
| 712 | r->ndm_state & |
| 713 | (NUD_REACHABLE | NUD_STALE | NUD_DELAY | NUD_PROBE | |
| 714 | NUD_PERMANENT)) |
| 715 | flags |= IPV6ND_REACHABLE; |
| 716 | memset(&addr6, 0, sizeof(addr6)); |
| 717 | while (RTA_OK(rta, len)) { |
| 718 | switch (rta->rta_type) { |
| 719 | case NDA_DST: |
| 720 | memcpy(&addr6.s6_addr, RTA_DATA(rta), |
| 721 | sizeof(addr6.s6_addr)); |
| 722 | break; |
| 723 | } |
| 724 | rta = RTA_NEXT(rta, len); |
| 725 | } |
| 726 | ipv6nd_neighbour(ctx, &addr6, flags); |
| 727 | } |
| 728 | |
| 729 | return 0; |
| 730 | } |
| 731 | #endif |
| 732 | |
| 733 | static int |
| 734 | link_netlink(struct dhcpcd_ctx *ctx, struct interface *ifp, |
| 735 | struct nlmsghdr *nlm) |
| 736 | { |
| 737 | int r; |
| 738 | size_t len; |
| 739 | struct rtattr *rta, *hwaddr; |
| 740 | struct ifinfomsg *ifi; |
| 741 | char ifn[IF_NAMESIZE + 1]; |
| 742 | |
| 743 | r = link_route(ctx, ifp, nlm); |
| 744 | if (r != 0) |
| 745 | return r; |
| 746 | r = link_addr(ctx, ifp, nlm); |
| 747 | if (r != 0) |
| 748 | return r; |
| 749 | #ifdef INET6 |
| 750 | r = link_neigh(ctx, ifp, nlm); |
| 751 | if (r != 0) |
| 752 | return r; |
| 753 | #endif |
| 754 | |
| 755 | if (nlm->nlmsg_type != RTM_NEWLINK && nlm->nlmsg_type != RTM_DELLINK) |
| 756 | return 0; |
| 757 | len = nlm->nlmsg_len - sizeof(*nlm); |
| 758 | if ((size_t)len < sizeof(*ifi)) { |
| 759 | errno = EBADMSG; |
| 760 | return -1; |
| 761 | } |
| 762 | ifi = NLMSG_DATA(nlm); |
| 763 | if (ifi->ifi_flags & IFF_LOOPBACK) |
| 764 | return 0; |
| 765 | rta = (struct rtattr *)(void *)((char *)ifi +NLMSG_ALIGN(sizeof(*ifi))); |
| 766 | len = NLMSG_PAYLOAD(nlm, sizeof(*ifi)); |
| 767 | *ifn = '\0'; |
| 768 | hwaddr = NULL; |
| 769 | |
| 770 | while (RTA_OK(rta, len)) { |
| 771 | switch (rta->rta_type) { |
| 772 | case IFLA_WIRELESS: |
| 773 | /* Ignore wireless messages */ |
| 774 | if (nlm->nlmsg_type == RTM_NEWLINK && |
| 775 | ifi->ifi_change == 0) |
| 776 | return 0; |
| 777 | break; |
| 778 | case IFLA_IFNAME: |
| 779 | strlcpy(ifn, RTA_DATA(rta), sizeof(ifn)); |
| 780 | break; |
| 781 | case IFLA_ADDRESS: |
| 782 | hwaddr = rta; |
| 783 | break; |
| 784 | } |
| 785 | rta = RTA_NEXT(rta, len); |
| 786 | } |
| 787 | |
| 788 | if (nlm->nlmsg_type == RTM_DELLINK) { |
| 789 | dhcpcd_handleinterface(ctx, -1, ifn); |
| 790 | return 0; |
| 791 | } |
| 792 | |
| 793 | /* Virtual interfaces may not get a valid hardware address |
| 794 | * at this point. |
| 795 | * To trigger a valid hardware address pickup we need to pretend |
| 796 | * that that don't exist until they have one. */ |
| 797 | if (ifi->ifi_flags & IFF_MASTER && !hwaddr) { |
| 798 | dhcpcd_handleinterface(ctx, -1, ifn); |
| 799 | return 0; |
| 800 | } |
| 801 | |
| 802 | /* Check for interface name change */ |
| 803 | if (handle_rename(ctx, (unsigned int)ifi->ifi_index, ifn)) |
| 804 | return 0; |
| 805 | |
| 806 | /* Check for a new interface */ |
| 807 | if ((ifp = if_find(ctx->ifaces, ifn)) == NULL) { |
| 808 | /* If are listening to a dev manager, let that announce |
| 809 | * the interface rather than the kernel. */ |
| 810 | if (dev_listening(ctx) < 1) |
| 811 | dhcpcd_handleinterface(ctx, 1, ifn); |
| 812 | return 0; |
| 813 | } |
| 814 | |
| 815 | /* Re-read hardware address and friends */ |
| 816 | if (!(ifi->ifi_flags & IFF_UP) && hwaddr) { |
| 817 | uint8_t l; |
| 818 | |
| 819 | l = l2addr_len(ifi->ifi_type); |
| 820 | if (hwaddr->rta_len == RTA_LENGTH(l)) |
| 821 | dhcpcd_handlehwaddr(ctx, ifn, RTA_DATA(hwaddr), l); |
| 822 | } |
| 823 | |
| 824 | dhcpcd_handlecarrier(ctx, |
| 825 | ifi->ifi_flags & IFF_RUNNING ? LINK_UP : LINK_DOWN, |
| 826 | ifi->ifi_flags, ifn); |
| 827 | return 0; |
| 828 | } |
| 829 | |
| 830 | int |
| 831 | if_managelink(struct dhcpcd_ctx *ctx) |
| 832 | { |
| 833 | |
| 834 | return get_netlink(ctx, NULL, |
| 835 | ctx->link_fd, MSG_DONTWAIT, &link_netlink); |
| 836 | } |
| 837 | |
| 838 | static int |
| 839 | send_netlink(struct dhcpcd_ctx *ctx, struct interface *ifp, |
| 840 | int protocol, struct nlmsghdr *hdr, |
| 841 | int (*callback)(struct dhcpcd_ctx *, struct interface *, struct nlmsghdr *)) |
| 842 | { |
| 843 | int s, r; |
| 844 | struct sockaddr_nl snl; |
| 845 | struct iovec iov; |
| 846 | struct msghdr msg; |
| 847 | static unsigned int seq; |
| 848 | |
| 849 | memset(&snl, 0, sizeof(snl)); |
| 850 | if ((s = _open_link_socket(&snl, 0, protocol)) == -1) |
| 851 | return -1; |
| 852 | memset(&iov, 0, sizeof(iov)); |
| 853 | iov.iov_base = hdr; |
| 854 | iov.iov_len = hdr->nlmsg_len; |
| 855 | memset(&msg, 0, sizeof(msg)); |
| 856 | msg.msg_name = &snl; |
| 857 | msg.msg_namelen = sizeof(snl); |
| 858 | msg.msg_iov = &iov; |
| 859 | msg.msg_iovlen = 1; |
| 860 | /* Request a reply */ |
| 861 | hdr->nlmsg_flags |= NLM_F_ACK; |
| 862 | hdr->nlmsg_seq = ++seq; |
| 863 | |
| 864 | if (sendmsg(s, &msg, 0) != -1) |
| 865 | r = get_netlink(ctx, ifp, s, 0, callback); |
| 866 | else |
| 867 | r = -1; |
| 868 | close(s); |
| 869 | return r; |
| 870 | } |
| 871 | |
| 872 | #define NLMSG_TAIL(nmsg) \ |
| 873 | ((struct rtattr *)(((ptrdiff_t)(nmsg))+NLMSG_ALIGN((nmsg)->nlmsg_len))) |
| 874 | |
| 875 | static int |
| 876 | add_attr_l(struct nlmsghdr *n, unsigned short maxlen, unsigned short type, |
| 877 | const void *data, unsigned short alen) |
| 878 | { |
| 879 | unsigned short len = (unsigned short)RTA_LENGTH(alen); |
| 880 | struct rtattr *rta; |
| 881 | |
| 882 | if (NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(len) > maxlen) { |
| 883 | errno = ENOBUFS; |
| 884 | return -1; |
| 885 | } |
| 886 | |
| 887 | rta = NLMSG_TAIL(n); |
| 888 | rta->rta_type = type; |
| 889 | rta->rta_len = len; |
| 890 | if (alen) |
| 891 | memcpy(RTA_DATA(rta), data, alen); |
| 892 | n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(len); |
| 893 | |
| 894 | return 0; |
| 895 | } |
| 896 | |
| 897 | static int |
| 898 | add_attr_32(struct nlmsghdr *n, unsigned short maxlen, unsigned short type, |
| 899 | uint32_t data) |
| 900 | { |
| 901 | unsigned short len = RTA_LENGTH(sizeof(data)); |
| 902 | struct rtattr *rta; |
| 903 | |
| 904 | if (NLMSG_ALIGN(n->nlmsg_len) + len > maxlen) { |
| 905 | errno = ENOBUFS; |
| 906 | return -1; |
| 907 | } |
| 908 | |
| 909 | rta = NLMSG_TAIL(n); |
| 910 | rta->rta_type = type; |
| 911 | rta->rta_len = len; |
| 912 | memcpy(RTA_DATA(rta), &data, sizeof(data)); |
| 913 | n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + len; |
| 914 | |
| 915 | return 0; |
| 916 | } |
| 917 | |
| 918 | #ifdef HAVE_NL80211_H |
| 919 | static struct nlattr * |
| 920 | nla_next(struct nlattr *nla, size_t *rem) |
| 921 | { |
| 922 | |
| 923 | *rem -= NLA_ALIGN(nla->nla_len); |
| 924 | return (struct nlattr *)(void *)((char *)nla + NLA_ALIGN(nla->nla_len)); |
| 925 | } |
| 926 | |
| 927 | #define NLA_TYPE(nla) ((nla)->nla_type & NLA_TYPE_MASK) |
| 928 | #define NLA_LEN(nla) (unsigned int)((nla)->nla_len - NLA_HDRLEN) |
| 929 | #define NLA_OK(nla, rem) \ |
| 930 | ((rem) >= sizeof(struct nlattr) && \ |
| 931 | (nla)->nla_len >= sizeof(struct nlattr) && \ |
| 932 | (nla)->nla_len <= rem) |
| 933 | #define NLA_DATA(nla) ((char *)(nla) + NLA_HDRLEN) |
| 934 | #define NLA_FOR_EACH_ATTR(pos, head, len, rem) \ |
| 935 | for (pos = head, rem = len; NLA_OK(pos, rem); pos = nla_next(pos, &(rem))) |
| 936 | |
| 937 | struct nlmg |
| 938 | { |
| 939 | struct nlmsghdr hdr; |
| 940 | struct genlmsghdr ghdr; |
| 941 | char buffer[64]; |
| 942 | }; |
| 943 | |
| 944 | static int |
| 945 | nla_put_32(struct nlmsghdr *n, unsigned short maxlen, |
| 946 | unsigned short type, uint32_t data) |
| 947 | { |
| 948 | unsigned short len; |
| 949 | struct nlattr *nla; |
| 950 | |
| 951 | len = NLA_ALIGN(NLA_HDRLEN + sizeof(data)); |
| 952 | if (NLMSG_ALIGN(n->nlmsg_len) + len > maxlen) { |
| 953 | errno = ENOBUFS; |
| 954 | return -1; |
| 955 | } |
| 956 | |
| 957 | nla = (struct nlattr *)NLMSG_TAIL(n); |
| 958 | nla->nla_type = type; |
| 959 | nla->nla_len = len; |
| 960 | memcpy(NLA_DATA(nla), &data, sizeof(data)); |
| 961 | n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + len; |
| 962 | |
| 963 | return 0; |
| 964 | } |
| 965 | |
| 966 | static int |
| 967 | nla_put_string(struct nlmsghdr *n, unsigned short maxlen, |
| 968 | unsigned short type, const char *data) |
| 969 | { |
| 970 | struct nlattr *nla; |
| 971 | size_t len, sl; |
| 972 | |
| 973 | sl = strlen(data) + 1; |
| 974 | len = NLA_ALIGN(NLA_HDRLEN + sl); |
| 975 | if (NLMSG_ALIGN(n->nlmsg_len) + len > maxlen) { |
| 976 | errno = ENOBUFS; |
| 977 | return -1; |
| 978 | } |
| 979 | |
| 980 | nla = (struct nlattr *)NLMSG_TAIL(n); |
| 981 | nla->nla_type = type; |
| 982 | nla->nla_len = (unsigned short)len; |
| 983 | memcpy(NLA_DATA(nla), data, sl); |
| 984 | n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + (unsigned short)len; |
| 985 | return 0; |
| 986 | } |
| 987 | |
| 988 | static int |
| 989 | gnl_parse(struct nlmsghdr *nlm, struct nlattr *tb[], int maxtype) |
| 990 | { |
| 991 | struct genlmsghdr *ghdr; |
| 992 | struct nlattr *head, *nla; |
| 993 | size_t len, rem; |
| 994 | int type; |
| 995 | |
| 996 | memset(tb, 0, sizeof(*tb) * ((unsigned int)maxtype + 1)); |
| 997 | ghdr = NLMSG_DATA(nlm); |
| 998 | head = (struct nlattr *)(void *)((char *) ghdr + GENL_HDRLEN); |
| 999 | len = nlm->nlmsg_len - GENL_HDRLEN - NLMSG_HDRLEN; |
| 1000 | NLA_FOR_EACH_ATTR(nla, head, len, rem) { |
| 1001 | type = NLA_TYPE(nla); |
| 1002 | if (type > maxtype) |
| 1003 | continue; |
| 1004 | tb[type] = nla; |
| 1005 | } |
| 1006 | return 0; |
| 1007 | } |
| 1008 | |
| 1009 | static int |
| 1010 | _gnl_getfamily(__unused struct dhcpcd_ctx *ctx, __unused struct interface *ifp, |
| 1011 | struct nlmsghdr *nlm) |
| 1012 | { |
| 1013 | struct nlattr *tb[CTRL_ATTR_FAMILY_ID + 1]; |
| 1014 | uint16_t family; |
| 1015 | |
| 1016 | if (gnl_parse(nlm, tb, CTRL_ATTR_FAMILY_ID) == -1) |
| 1017 | return -1; |
| 1018 | if (tb[CTRL_ATTR_FAMILY_ID] == NULL) { |
| 1019 | errno = ENOENT; |
| 1020 | return -1; |
| 1021 | } |
| 1022 | family = *(uint16_t *)(void *)NLA_DATA(tb[CTRL_ATTR_FAMILY_ID]); |
| 1023 | return (int)family; |
| 1024 | } |
| 1025 | |
| 1026 | static int |
| 1027 | gnl_getfamily(struct dhcpcd_ctx *ctx, const char *name) |
| 1028 | { |
| 1029 | struct nlmg nlm; |
| 1030 | |
| 1031 | memset(&nlm, 0, sizeof(nlm)); |
| 1032 | nlm.hdr.nlmsg_len = NLMSG_LENGTH(sizeof(struct genlmsghdr)); |
| 1033 | nlm.hdr.nlmsg_type = GENL_ID_CTRL; |
| 1034 | nlm.hdr.nlmsg_flags = NLM_F_REQUEST; |
| 1035 | nlm.ghdr.cmd = CTRL_CMD_GETFAMILY; |
| 1036 | nlm.ghdr.version = 1; |
| 1037 | if (nla_put_string(&nlm.hdr, sizeof(nlm), |
| 1038 | CTRL_ATTR_FAMILY_NAME, name) == -1) |
| 1039 | return -1; |
| 1040 | return send_netlink(ctx, NULL, NETLINK_GENERIC, &nlm.hdr, |
| 1041 | &_gnl_getfamily); |
| 1042 | } |
| 1043 | |
| 1044 | static int |
| 1045 | _if_getssid(__unused struct dhcpcd_ctx *ctx, struct interface *ifp, |
| 1046 | struct nlmsghdr *nlm) |
| 1047 | { |
| 1048 | struct nlattr *tb[NL80211_ATTR_SSID + 1]; |
| 1049 | |
| 1050 | if (gnl_parse(nlm, tb, NL80211_ATTR_SSID) == -1) |
| 1051 | return -1; |
| 1052 | |
| 1053 | if (tb[NL80211_ATTR_SSID] == NULL) { |
| 1054 | /* If the SSID is not found then it means that |
| 1055 | * we're not associated to an AP. */ |
| 1056 | ifp->ssid_len = 0; |
| 1057 | goto out; |
| 1058 | } |
| 1059 | |
| 1060 | ifp->ssid_len = NLA_LEN(tb[NL80211_ATTR_SSID]); |
| 1061 | if (ifp->ssid_len > sizeof(ifp->ssid)) { |
| 1062 | errno = ENOBUFS; |
| 1063 | ifp->ssid_len = 0; |
| 1064 | return -1; |
| 1065 | } |
| 1066 | memcpy(ifp->ssid, NLA_DATA(tb[NL80211_ATTR_SSID]), ifp->ssid_len); |
| 1067 | |
| 1068 | out: |
| 1069 | ifp->ssid[ifp->ssid_len] = '\0'; |
| 1070 | return (int)ifp->ssid_len; |
| 1071 | } |
| 1072 | |
| 1073 | static int |
| 1074 | if_getssid_nl80211(struct interface *ifp) |
| 1075 | { |
| 1076 | int family; |
| 1077 | struct nlmg nlm; |
| 1078 | |
| 1079 | errno = 0; |
| 1080 | family = gnl_getfamily(ifp->ctx, "nl80211"); |
| 1081 | if (family == -1) |
| 1082 | return -1; |
| 1083 | memset(&nlm, 0, sizeof(nlm)); |
| 1084 | nlm.hdr.nlmsg_len = NLMSG_LENGTH(sizeof(struct genlmsghdr)); |
| 1085 | nlm.hdr.nlmsg_type = (unsigned short)family; |
| 1086 | nlm.hdr.nlmsg_flags = NLM_F_REQUEST; |
| 1087 | nlm.ghdr.cmd = NL80211_CMD_GET_INTERFACE; |
| 1088 | nla_put_32(&nlm.hdr, sizeof(nlm), NL80211_ATTR_IFINDEX, ifp->index); |
| 1089 | |
| 1090 | return send_netlink(ifp->ctx, ifp, |
| 1091 | NETLINK_GENERIC, &nlm.hdr, &_if_getssid); |
| 1092 | } |
| 1093 | #endif |
| 1094 | |
| 1095 | int |
| 1096 | if_getssid(struct interface *ifp) |
| 1097 | { |
| 1098 | int r; |
| 1099 | |
| 1100 | r = if_getssid_wext(ifp->name, ifp->ssid); |
| 1101 | if (r != -1) |
| 1102 | ifp->ssid_len = (unsigned int)r; |
| 1103 | #ifdef HAVE_NL80211_H |
| 1104 | else if (r == -1) |
| 1105 | r = if_getssid_nl80211(ifp); |
| 1106 | #endif |
| 1107 | return r; |
| 1108 | } |
| 1109 | |
| 1110 | struct nlma |
| 1111 | { |
| 1112 | struct nlmsghdr hdr; |
| 1113 | struct ifaddrmsg ifa; |
| 1114 | char buffer[64]; |
| 1115 | }; |
| 1116 | |
| 1117 | struct nlmr |
| 1118 | { |
| 1119 | struct nlmsghdr hdr; |
| 1120 | struct rtmsg rt; |
| 1121 | char buffer[256]; |
| 1122 | }; |
| 1123 | |
| 1124 | #ifdef INET |
| 1125 | const char *if_pfname = "Packet Socket"; |
| 1126 | |
| 1127 | int |
| 1128 | if_openrawsocket(struct interface *ifp, uint16_t protocol) |
| 1129 | { |
| 1130 | int s; |
| 1131 | union sockunion { |
| 1132 | struct sockaddr sa; |
| 1133 | struct sockaddr_ll sll; |
| 1134 | struct sockaddr_storage ss; |
| 1135 | } su; |
| 1136 | struct sock_fprog pf; |
| 1137 | #ifdef PACKET_AUXDATA |
| 1138 | int n; |
| 1139 | #endif |
| 1140 | |
| 1141 | #ifdef SOCK_CLOEXEC |
| 1142 | if ((s = socket(PF_PACKET, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK, |
| 1143 | htons(protocol))) == -1) |
| 1144 | return -1; |
| 1145 | #else |
| 1146 | int flags; |
| 1147 | |
| 1148 | if ((s = socket(PF_PACKET, SOCK_DGRAM, htons(protocol))) == -1) |
| 1149 | return -1; |
| 1150 | if ((flags = fcntl(s, F_GETFD, 0)) == -1 || |
| 1151 | fcntl(s, F_SETFD, flags | FD_CLOEXEC) == -1) |
| 1152 | { |
| 1153 | close(s); |
| 1154 | return -1; |
| 1155 | } |
| 1156 | if ((flags = fcntl(s, F_GETFL, 0)) == -1 || |
| 1157 | fcntl(s, F_SETFL, flags | O_NONBLOCK) == -1) |
| 1158 | { |
| 1159 | close(s); |
| 1160 | return -1; |
| 1161 | } |
| 1162 | #endif |
| 1163 | /* Install the DHCP filter */ |
| 1164 | memset(&pf, 0, sizeof(pf)); |
| 1165 | if (protocol == ETHERTYPE_ARP) { |
| 1166 | pf.filter = UNCONST(arp_bpf_filter); |
| 1167 | pf.len = arp_bpf_filter_len; |
| 1168 | } else { |
| 1169 | pf.filter = UNCONST(dhcp_bpf_filter); |
| 1170 | pf.len = dhcp_bpf_filter_len; |
| 1171 | } |
| 1172 | if (setsockopt(s, SOL_SOCKET, SO_ATTACH_FILTER, &pf, sizeof(pf)) != 0) |
| 1173 | goto eexit; |
| 1174 | #ifdef PACKET_AUXDATA |
| 1175 | n = 1; |
| 1176 | if (setsockopt(s, SOL_PACKET, PACKET_AUXDATA, &n, sizeof(n)) != 0) { |
| 1177 | if (errno != ENOPROTOOPT) |
| 1178 | goto eexit; |
| 1179 | } |
| 1180 | #endif |
| 1181 | |
| 1182 | memset(&su, 0, sizeof(su)); |
| 1183 | su.sll.sll_family = PF_PACKET; |
| 1184 | su.sll.sll_protocol = htons(protocol); |
| 1185 | su.sll.sll_ifindex = (int)ifp->index; |
| 1186 | if (bind(s, &su.sa, sizeof(su.sll)) == -1) |
| 1187 | goto eexit; |
| 1188 | return s; |
| 1189 | |
| 1190 | eexit: |
| 1191 | close(s); |
| 1192 | return -1; |
| 1193 | } |
| 1194 | |
| 1195 | ssize_t |
| 1196 | if_sendrawpacket(const struct interface *ifp, uint16_t protocol, |
Samuel Tan | f20514b | 2015-08-13 16:24:02 -0700 | [diff] [blame] | 1197 | const void *data, size_t len, const uint8_t *dest_hw_addr) |
Samuel Tan | d7ed851 | 2015-08-13 16:11:35 -0700 | [diff] [blame] | 1198 | { |
| 1199 | const struct dhcp_state *state; |
| 1200 | union sockunion { |
| 1201 | struct sockaddr sa; |
| 1202 | struct sockaddr_ll sll; |
| 1203 | struct sockaddr_storage ss; |
| 1204 | } su; |
| 1205 | int fd; |
| 1206 | |
| 1207 | memset(&su, 0, sizeof(su)); |
| 1208 | su.sll.sll_family = AF_PACKET; |
| 1209 | su.sll.sll_protocol = htons(protocol); |
| 1210 | su.sll.sll_ifindex = (int)ifp->index; |
| 1211 | su.sll.sll_hatype = htons(ifp->family); |
| 1212 | su.sll.sll_halen = (unsigned char)ifp->hwlen; |
| 1213 | if (ifp->family == ARPHRD_INFINIBAND) |
| 1214 | memcpy(&su.sll.sll_addr, |
| 1215 | &ipv4_bcast_addr, sizeof(ipv4_bcast_addr)); |
Samuel Tan | f20514b | 2015-08-13 16:24:02 -0700 | [diff] [blame] | 1216 | else { |
| 1217 | if (dest_hw_addr) |
| 1218 | memcpy(&su.sll.sll_addr, dest_hw_addr, ifp->hwlen); |
| 1219 | else |
| 1220 | memset(&su.sll.sll_addr, 0xff, ifp->hwlen); |
| 1221 | } |
Samuel Tan | d7ed851 | 2015-08-13 16:11:35 -0700 | [diff] [blame] | 1222 | state = D_CSTATE(ifp); |
| 1223 | if (protocol == ETHERTYPE_ARP) |
| 1224 | fd = state->arp_fd; |
| 1225 | else |
| 1226 | fd = state->raw_fd; |
| 1227 | |
| 1228 | return sendto(fd, data, len, 0, &su.sa, sizeof(su.sll)); |
| 1229 | } |
| 1230 | |
| 1231 | ssize_t |
| 1232 | if_readrawpacket(struct interface *ifp, uint16_t protocol, |
| 1233 | void *data, size_t len, int *flags) |
| 1234 | { |
| 1235 | struct iovec iov = { |
| 1236 | .iov_base = data, |
| 1237 | .iov_len = len, |
| 1238 | }; |
| 1239 | struct msghdr msg = { |
| 1240 | .msg_iov = &iov, |
| 1241 | .msg_iovlen = 1, |
| 1242 | }; |
| 1243 | struct dhcp_state *state; |
| 1244 | #ifdef PACKET_AUXDATA |
| 1245 | unsigned char cmsgbuf[CMSG_LEN(sizeof(struct tpacket_auxdata))]; |
| 1246 | struct cmsghdr *cmsg; |
| 1247 | struct tpacket_auxdata *aux; |
| 1248 | #endif |
| 1249 | |
| 1250 | ssize_t bytes; |
| 1251 | int fd = -1; |
| 1252 | |
| 1253 | #ifdef PACKET_AUXDATA |
| 1254 | msg.msg_control = cmsgbuf; |
| 1255 | msg.msg_controllen = sizeof(cmsgbuf); |
| 1256 | #endif |
| 1257 | |
| 1258 | state = D_STATE(ifp); |
| 1259 | if (protocol == ETHERTYPE_ARP) |
| 1260 | fd = state->arp_fd; |
| 1261 | else |
| 1262 | fd = state->raw_fd; |
| 1263 | bytes = recvmsg(fd, &msg, 0); |
| 1264 | if (bytes == -1) |
| 1265 | return -1; |
| 1266 | *flags = RAW_EOF; /* We only ever read one packet */ |
| 1267 | if (bytes) { |
| 1268 | #ifdef PACKET_AUXDATA |
| 1269 | for (cmsg = CMSG_FIRSTHDR(&msg); |
| 1270 | cmsg; |
| 1271 | cmsg = CMSG_NXTHDR(&msg, cmsg)) |
| 1272 | { |
| 1273 | if (cmsg->cmsg_level == SOL_PACKET && |
| 1274 | cmsg->cmsg_type == PACKET_AUXDATA) { |
| 1275 | aux = (void *)CMSG_DATA(cmsg); |
| 1276 | if (aux->tp_status & TP_STATUS_CSUMNOTREADY) |
| 1277 | *flags |= RAW_PARTIALCSUM; |
| 1278 | } |
| 1279 | } |
| 1280 | #endif |
| 1281 | } |
| 1282 | return bytes; |
| 1283 | } |
| 1284 | |
| 1285 | int |
| 1286 | if_address(const struct interface *iface, |
| 1287 | const struct in_addr *address, const struct in_addr *netmask, |
| 1288 | const struct in_addr *broadcast, int action) |
| 1289 | { |
| 1290 | struct nlma nlm; |
| 1291 | int retval = 0; |
| 1292 | |
| 1293 | memset(&nlm, 0, sizeof(nlm)); |
| 1294 | nlm.hdr.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrmsg)); |
| 1295 | nlm.hdr.nlmsg_flags = NLM_F_REQUEST; |
| 1296 | if (action >= 0) { |
| 1297 | nlm.hdr.nlmsg_flags |= NLM_F_CREATE | NLM_F_REPLACE; |
| 1298 | nlm.hdr.nlmsg_type = RTM_NEWADDR; |
| 1299 | } else |
| 1300 | nlm.hdr.nlmsg_type = RTM_DELADDR; |
| 1301 | nlm.ifa.ifa_index = iface->index; |
| 1302 | nlm.ifa.ifa_family = AF_INET; |
| 1303 | nlm.ifa.ifa_prefixlen = inet_ntocidr(*netmask); |
| 1304 | /* This creates the aliased interface */ |
| 1305 | add_attr_l(&nlm.hdr, sizeof(nlm), IFA_LABEL, |
| 1306 | iface->alias, (unsigned short)(strlen(iface->alias) + 1)); |
| 1307 | add_attr_l(&nlm.hdr, sizeof(nlm), IFA_LOCAL, |
| 1308 | &address->s_addr, sizeof(address->s_addr)); |
| 1309 | if (action >= 0 && broadcast) |
| 1310 | add_attr_l(&nlm.hdr, sizeof(nlm), IFA_BROADCAST, |
| 1311 | &broadcast->s_addr, sizeof(broadcast->s_addr)); |
| 1312 | |
| 1313 | if (send_netlink(iface->ctx, NULL, NETLINK_ROUTE, &nlm.hdr, NULL) == -1) |
| 1314 | retval = -1; |
| 1315 | return retval; |
| 1316 | } |
| 1317 | |
| 1318 | int |
| 1319 | if_route(unsigned char cmd, const struct rt *rt) |
| 1320 | { |
| 1321 | struct nlmr nlm; |
| 1322 | int retval = 0; |
| 1323 | struct dhcp_state *state; |
| 1324 | |
| 1325 | memset(&nlm, 0, sizeof(nlm)); |
| 1326 | nlm.hdr.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg)); |
| 1327 | switch (cmd) { |
| 1328 | case RTM_CHANGE: |
| 1329 | nlm.hdr.nlmsg_type = RTM_NEWROUTE; |
| 1330 | nlm.hdr.nlmsg_flags = NLM_F_CREATE | NLM_F_REPLACE; |
| 1331 | break; |
| 1332 | case RTM_ADD: |
| 1333 | nlm.hdr.nlmsg_type = RTM_NEWROUTE; |
| 1334 | nlm.hdr.nlmsg_flags = NLM_F_CREATE | NLM_F_EXCL; |
| 1335 | break; |
| 1336 | case RTM_DELETE: |
| 1337 | nlm.hdr.nlmsg_type = RTM_DELROUTE; |
| 1338 | break; |
| 1339 | } |
| 1340 | nlm.hdr.nlmsg_flags |= NLM_F_REQUEST; |
| 1341 | nlm.rt.rtm_family = AF_INET; |
| 1342 | nlm.rt.rtm_table = RT_TABLE_MAIN; |
| 1343 | |
| 1344 | state = D_STATE(rt->iface); |
| 1345 | if (cmd == RTM_DELETE) |
| 1346 | nlm.rt.rtm_scope = RT_SCOPE_NOWHERE; |
| 1347 | else { |
| 1348 | /* We only change route metrics for kernel routes */ |
| 1349 | if (rt->dest.s_addr == |
| 1350 | (state->addr.s_addr & state->net.s_addr) && |
| 1351 | rt->net.s_addr == state->net.s_addr) |
| 1352 | nlm.rt.rtm_protocol = RTPROT_KERNEL; |
| 1353 | else |
| 1354 | nlm.rt.rtm_protocol = RTPROT_BOOT; |
| 1355 | if (rt->iface->flags & IFF_LOOPBACK) |
| 1356 | nlm.rt.rtm_scope = RT_SCOPE_HOST; |
| 1357 | else if (rt->gate.s_addr == INADDR_ANY || |
| 1358 | (rt->gate.s_addr == rt->dest.s_addr && |
| 1359 | rt->net.s_addr == INADDR_BROADCAST)) |
| 1360 | nlm.rt.rtm_scope = RT_SCOPE_LINK; |
| 1361 | else |
| 1362 | nlm.rt.rtm_scope = RT_SCOPE_UNIVERSE; |
| 1363 | nlm.rt.rtm_type = RTN_UNICAST; |
| 1364 | } |
| 1365 | |
| 1366 | nlm.rt.rtm_dst_len = inet_ntocidr(rt->net); |
| 1367 | add_attr_l(&nlm.hdr, sizeof(nlm), RTA_DST, |
| 1368 | &rt->dest.s_addr, sizeof(rt->dest.s_addr)); |
| 1369 | if (nlm.rt.rtm_protocol == RTPROT_KERNEL) { |
| 1370 | add_attr_l(&nlm.hdr, sizeof(nlm), RTA_PREFSRC, |
| 1371 | &state->addr.s_addr, sizeof(state->addr.s_addr)); |
| 1372 | } |
| 1373 | /* If a host route then don't add the gateway */ |
| 1374 | if ((cmd == RTM_ADD || cmd == RTM_CHANGE) && |
| 1375 | rt->net.s_addr != INADDR_BROADCAST) |
| 1376 | add_attr_l(&nlm.hdr, sizeof(nlm), RTA_GATEWAY, |
| 1377 | &rt->gate.s_addr, sizeof(rt->gate.s_addr)); |
| 1378 | |
| 1379 | if (rt->gate.s_addr != htonl(INADDR_LOOPBACK)) |
| 1380 | add_attr_32(&nlm.hdr, sizeof(nlm), RTA_OIF, rt->iface->index); |
| 1381 | if (rt->metric) |
| 1382 | add_attr_32(&nlm.hdr, sizeof(nlm), RTA_PRIORITY, rt->metric); |
| 1383 | |
| 1384 | if (send_netlink(rt->iface->ctx, NULL, |
| 1385 | NETLINK_ROUTE, &nlm.hdr, NULL) == -1) |
| 1386 | retval = -1; |
| 1387 | return retval; |
| 1388 | } |
| 1389 | |
| 1390 | static int |
| 1391 | _if_initrt(struct dhcpcd_ctx *ctx, __unused struct interface *ifp, |
| 1392 | struct nlmsghdr *nlm) |
| 1393 | { |
| 1394 | struct rt rt; |
| 1395 | |
| 1396 | if (if_copyrt(ctx, &rt, nlm) == 0) |
| 1397 | ipv4_handlert(ctx, RTM_ADD, &rt); |
| 1398 | return 0; |
| 1399 | } |
| 1400 | |
| 1401 | int |
| 1402 | if_initrt(struct interface *ifp) |
| 1403 | { |
| 1404 | struct nlmr nlm; |
| 1405 | |
| 1406 | ipv4_freerts(ifp->ctx->ipv4_kroutes); |
| 1407 | |
| 1408 | memset(&nlm, 0, sizeof(nlm)); |
| 1409 | nlm.hdr.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg)); |
| 1410 | nlm.hdr.nlmsg_type = RTM_GETROUTE; |
| 1411 | nlm.hdr.nlmsg_flags = NLM_F_REQUEST | NLM_F_MATCH; |
| 1412 | nlm.hdr.nlmsg_flags |= NLM_F_REQUEST; |
| 1413 | nlm.rt.rtm_family = AF_INET; |
| 1414 | nlm.rt.rtm_table = RT_TABLE_MAIN; |
| 1415 | add_attr_32(&nlm.hdr, sizeof(nlm), RTA_OIF, ifp->index); |
| 1416 | |
| 1417 | return send_netlink(ifp->ctx, ifp, |
| 1418 | NETLINK_ROUTE, &nlm.hdr, &_if_initrt); |
| 1419 | } |
| 1420 | |
| 1421 | int |
| 1422 | if_addrflags(__unused const struct in_addr *addr, |
| 1423 | __unused const struct interface *ifp) |
| 1424 | { |
| 1425 | |
| 1426 | /* Linux has no support for IPv4 address flags */ |
| 1427 | return 0; |
| 1428 | } |
| 1429 | #endif |
| 1430 | |
| 1431 | #ifdef INET6 |
| 1432 | int |
| 1433 | if_address6(const struct ipv6_addr *ap, int action) |
| 1434 | { |
| 1435 | struct nlma nlm; |
| 1436 | struct ifa_cacheinfo cinfo; |
| 1437 | int retval = 0; |
| 1438 | /* IFA_FLAGS is not a define, but is was added at the same time |
| 1439 | * IFA_F_NOPREFIXROUTE was do use that. */ |
| 1440 | #if defined(IFA_F_NOPREFIXROUTE) || defined(IFA_F_MANAGETEMPADDR) |
| 1441 | uint32_t flags = 0; |
| 1442 | #endif |
| 1443 | |
| 1444 | memset(&nlm, 0, sizeof(nlm)); |
| 1445 | nlm.hdr.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrmsg)); |
| 1446 | nlm.hdr.nlmsg_flags = NLM_F_REQUEST; |
| 1447 | if (action >= 0) { |
| 1448 | nlm.hdr.nlmsg_flags |= NLM_F_CREATE | NLM_F_REPLACE; |
| 1449 | nlm.hdr.nlmsg_type = RTM_NEWADDR; |
| 1450 | } else |
| 1451 | nlm.hdr.nlmsg_type = RTM_DELADDR; |
| 1452 | nlm.ifa.ifa_index = ap->iface->index; |
| 1453 | nlm.ifa.ifa_family = AF_INET6; |
| 1454 | if (ap->addr_flags & IFA_F_TEMPORARY) { |
| 1455 | #ifdef IFA_F_NOPREFIXROUTE |
| 1456 | flags |= IFA_F_TEMPORARY; |
| 1457 | #else |
| 1458 | nlm.ifa.ifa_flags |= IFA_F_TEMPORARY; |
| 1459 | #endif |
| 1460 | } |
| 1461 | #ifdef IFA_F_MANAGETEMPADDR |
| 1462 | else if (ap->flags & IPV6_AF_AUTOCONF && |
| 1463 | ip6_use_tempaddr(ap->iface->name)) |
| 1464 | flags |= IFA_F_MANAGETEMPADDR; |
| 1465 | #endif |
| 1466 | |
| 1467 | /* Add as /128 if no IFA_F_NOPREFIXROUTE ? */ |
| 1468 | nlm.ifa.ifa_prefixlen = ap->prefix_len; |
| 1469 | /* This creates the aliased interface */ |
| 1470 | add_attr_l(&nlm.hdr, sizeof(nlm), IFA_LABEL, |
| 1471 | ap->iface->alias, (unsigned short)(strlen(ap->iface->alias) + 1)); |
| 1472 | add_attr_l(&nlm.hdr, sizeof(nlm), IFA_LOCAL, |
| 1473 | &ap->addr.s6_addr, sizeof(ap->addr.s6_addr)); |
| 1474 | |
| 1475 | if (action >= 0) { |
| 1476 | memset(&cinfo, 0, sizeof(cinfo)); |
| 1477 | cinfo.ifa_prefered = ap->prefix_pltime; |
| 1478 | cinfo.ifa_valid = ap->prefix_vltime; |
| 1479 | add_attr_l(&nlm.hdr, sizeof(nlm), IFA_CACHEINFO, |
| 1480 | &cinfo, sizeof(cinfo)); |
| 1481 | } |
| 1482 | |
| 1483 | #ifdef IFA_F_NOPREFIXROUTE |
| 1484 | if (!IN6_IS_ADDR_LINKLOCAL(&ap->addr)) |
| 1485 | flags |= IFA_F_NOPREFIXROUTE; |
| 1486 | #endif |
| 1487 | #if defined(IFA_F_NOPREFIXROUTE) || defined(IFA_F_MANAGETEMPADDR) |
| 1488 | if (flags) |
| 1489 | add_attr_32(&nlm.hdr, sizeof(nlm), IFA_FLAGS, flags); |
| 1490 | #endif |
| 1491 | |
| 1492 | if (send_netlink(ap->iface->ctx, NULL, NETLINK_ROUTE, &nlm.hdr, |
| 1493 | NULL) == -1) |
| 1494 | retval = -1; |
| 1495 | return retval; |
| 1496 | } |
| 1497 | |
| 1498 | static int |
| 1499 | rta_add_attr_32(struct rtattr *rta, unsigned short maxlen, |
| 1500 | unsigned short type, uint32_t data) |
| 1501 | { |
| 1502 | unsigned short len = RTA_LENGTH(sizeof(data)); |
| 1503 | struct rtattr *subrta; |
| 1504 | |
| 1505 | if (RTA_ALIGN(rta->rta_len) + len > maxlen) { |
| 1506 | errno = ENOBUFS; |
| 1507 | return -1; |
| 1508 | } |
| 1509 | |
| 1510 | subrta = (struct rtattr*)(void *) |
| 1511 | (((char*)rta) + RTA_ALIGN(rta->rta_len)); |
| 1512 | subrta->rta_type = type; |
| 1513 | subrta->rta_len = len; |
| 1514 | memcpy(RTA_DATA(subrta), &data, sizeof(data)); |
| 1515 | rta->rta_len = (unsigned short)(NLMSG_ALIGN(rta->rta_len) + len); |
| 1516 | return 0; |
| 1517 | } |
| 1518 | |
| 1519 | int |
| 1520 | if_route6(unsigned char cmd, const struct rt6 *rt) |
| 1521 | { |
| 1522 | struct nlmr nlm; |
| 1523 | int retval = 0; |
| 1524 | |
| 1525 | memset(&nlm, 0, sizeof(nlm)); |
| 1526 | nlm.hdr.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg)); |
| 1527 | switch (cmd) { |
| 1528 | case RTM_CHANGE: |
| 1529 | nlm.hdr.nlmsg_type = RTM_NEWROUTE; |
| 1530 | nlm.hdr.nlmsg_flags = NLM_F_CREATE | NLM_F_REPLACE; |
| 1531 | break; |
| 1532 | case RTM_ADD: |
| 1533 | nlm.hdr.nlmsg_type = RTM_NEWROUTE; |
| 1534 | nlm.hdr.nlmsg_flags = NLM_F_CREATE | NLM_F_EXCL; |
| 1535 | break; |
| 1536 | case RTM_DELETE: |
| 1537 | nlm.hdr.nlmsg_type = RTM_DELROUTE; |
| 1538 | break; |
| 1539 | } |
| 1540 | nlm.hdr.nlmsg_flags |= NLM_F_REQUEST; |
| 1541 | nlm.rt.rtm_family = AF_INET6; |
| 1542 | nlm.rt.rtm_table = RT_TABLE_MAIN; |
| 1543 | |
| 1544 | if (cmd == RTM_DELETE) |
| 1545 | nlm.rt.rtm_scope = RT_SCOPE_NOWHERE; |
| 1546 | else { |
| 1547 | /* None interface subnet routes are static. */ |
| 1548 | if (rt->iface->flags & IFF_LOOPBACK) |
| 1549 | nlm.rt.rtm_scope = RT_SCOPE_HOST; |
| 1550 | else if (IN6_IS_ADDR_UNSPECIFIED(&rt->gate)) { |
| 1551 | nlm.rt.rtm_protocol = RTPROT_KERNEL; |
| 1552 | nlm.rt.rtm_scope = RT_SCOPE_LINK; |
| 1553 | } else |
| 1554 | nlm.rt.rtm_protocol = RTPROT_BOOT; |
| 1555 | if (rt->flags & RTF_REJECT) |
| 1556 | nlm.rt.rtm_type = RTN_UNREACHABLE; |
| 1557 | else |
| 1558 | nlm.rt.rtm_type = RTN_UNICAST; |
| 1559 | } |
| 1560 | |
| 1561 | nlm.rt.rtm_dst_len = ipv6_prefixlen(&rt->net); |
| 1562 | add_attr_l(&nlm.hdr, sizeof(nlm), RTA_DST, |
| 1563 | &rt->dest.s6_addr, sizeof(rt->dest.s6_addr)); |
| 1564 | |
| 1565 | if (cmd == RTM_ADD && !IN6_IS_ADDR_UNSPECIFIED(&rt->gate)) |
| 1566 | add_attr_l(&nlm.hdr, sizeof(nlm), RTA_GATEWAY, |
| 1567 | &rt->gate.s6_addr, sizeof(rt->gate.s6_addr)); |
| 1568 | |
| 1569 | if (!(rt->flags & RTF_REJECT)) { |
| 1570 | add_attr_32(&nlm.hdr, sizeof(nlm), RTA_OIF, rt->iface->index); |
| 1571 | if (rt->metric) |
| 1572 | add_attr_32(&nlm.hdr, sizeof(nlm), |
| 1573 | RTA_PRIORITY, rt->metric); |
| 1574 | } |
| 1575 | if (cmd == RTM_ADD && rt->mtu) { |
| 1576 | char metricsbuf[32]; |
| 1577 | struct rtattr *metrics = (void *)metricsbuf; |
| 1578 | |
| 1579 | metrics->rta_type = RTA_METRICS; |
| 1580 | metrics->rta_len = RTA_LENGTH(0); |
| 1581 | rta_add_attr_32(metrics, sizeof(metricsbuf), RTAX_MTU, rt->mtu); |
| 1582 | add_attr_l(&nlm.hdr, sizeof(nlm), RTA_METRICS, |
| 1583 | RTA_DATA(metrics), (unsigned short)RTA_PAYLOAD(metrics)); |
| 1584 | } |
| 1585 | |
| 1586 | if (send_netlink(rt->iface->ctx, NULL, |
| 1587 | NETLINK_ROUTE, &nlm.hdr, NULL) == -1) |
| 1588 | retval = -1; |
| 1589 | return retval; |
| 1590 | } |
| 1591 | |
| 1592 | static int |
| 1593 | _if_initrt6(struct dhcpcd_ctx *ctx, __unused struct interface *ifp, |
| 1594 | struct nlmsghdr *nlm) |
| 1595 | { |
| 1596 | struct rt6 rt; |
| 1597 | |
| 1598 | if (if_copyrt6(ctx, &rt, nlm) == 0) |
| 1599 | ipv6_handlert(ctx, RTM_ADD, &rt); |
| 1600 | return 0; |
| 1601 | } |
| 1602 | |
| 1603 | int |
| 1604 | if_initrt6(struct interface *ifp) |
| 1605 | { |
| 1606 | struct nlmr nlm; |
| 1607 | |
| 1608 | ipv6_freerts(&ifp->ctx->ipv6->kroutes); |
| 1609 | |
| 1610 | memset(&nlm, 0, sizeof(nlm)); |
| 1611 | nlm.hdr.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg)); |
| 1612 | nlm.hdr.nlmsg_type = RTM_GETROUTE; |
| 1613 | nlm.hdr.nlmsg_flags = NLM_F_REQUEST | NLM_F_MATCH; |
| 1614 | nlm.hdr.nlmsg_flags |= NLM_F_REQUEST; |
| 1615 | nlm.rt.rtm_family = AF_INET6; |
| 1616 | nlm.rt.rtm_table = RT_TABLE_MAIN; |
| 1617 | add_attr_32(&nlm.hdr, sizeof(nlm), RTA_OIF, ifp->index); |
| 1618 | |
| 1619 | return send_netlink(ifp->ctx, ifp, |
| 1620 | NETLINK_ROUTE, &nlm.hdr, &_if_initrt6); |
| 1621 | } |
| 1622 | |
| 1623 | int |
| 1624 | if_addrflags6(const struct in6_addr *addr, const struct interface *ifp) |
| 1625 | { |
| 1626 | FILE *fp; |
| 1627 | char *p, ifaddress[33], address[33], name[IF_NAMESIZE + 1]; |
| 1628 | unsigned int ifindex; |
| 1629 | int prefix, scope, flags, i; |
| 1630 | |
| 1631 | fp = fopen(PROC_INET6, "r"); |
| 1632 | if (fp == NULL) |
| 1633 | return -1; |
| 1634 | |
| 1635 | p = ifaddress; |
| 1636 | for (i = 0; i < (int)sizeof(addr->s6_addr); i++) { |
| 1637 | p += snprintf(p, 3, "%.2x", addr->s6_addr[i]); |
| 1638 | } |
| 1639 | *p = '\0'; |
| 1640 | |
| 1641 | while (fscanf(fp, "%32[a-f0-9] %x %x %x %x %"TOSTRING(IF_NAMESIZE)"s\n", |
| 1642 | address, &ifindex, &prefix, &scope, &flags, name) == 6) |
| 1643 | { |
| 1644 | if (strlen(address) != 32) { |
| 1645 | fclose(fp); |
| 1646 | errno = ENOTSUP; |
| 1647 | return -1; |
| 1648 | } |
| 1649 | if (strcmp(name, ifp->name) == 0 && |
| 1650 | strcmp(ifaddress, address) == 0) |
| 1651 | { |
| 1652 | fclose(fp); |
| 1653 | return flags; |
| 1654 | } |
| 1655 | } |
| 1656 | |
| 1657 | fclose(fp); |
| 1658 | errno = ESRCH; |
| 1659 | return -1; |
| 1660 | } |
| 1661 | |
| 1662 | int |
| 1663 | if_getlifetime6(__unused struct ipv6_addr *ia) |
| 1664 | { |
| 1665 | |
| 1666 | /* God knows how to work out address lifetimes on Linux */ |
| 1667 | errno = ENOTSUP; |
| 1668 | return -1; |
| 1669 | } |
| 1670 | |
| 1671 | struct nlml |
| 1672 | { |
| 1673 | struct nlmsghdr hdr; |
| 1674 | struct ifinfomsg i; |
| 1675 | char buffer[32]; |
| 1676 | }; |
| 1677 | |
| 1678 | static int |
| 1679 | add_attr_8(struct nlmsghdr *n, unsigned short maxlen, unsigned short type, |
| 1680 | uint8_t data) |
| 1681 | { |
| 1682 | |
| 1683 | return add_attr_l(n, maxlen, type, &data, sizeof(data)); |
| 1684 | } |
| 1685 | |
| 1686 | static struct rtattr * |
| 1687 | add_attr_nest(struct nlmsghdr *n, unsigned short maxlen, unsigned short type) |
| 1688 | { |
| 1689 | struct rtattr *nest; |
| 1690 | |
| 1691 | nest = NLMSG_TAIL(n); |
| 1692 | add_attr_l(n, maxlen, type, NULL, 0); |
| 1693 | return nest; |
| 1694 | } |
| 1695 | |
| 1696 | static void |
| 1697 | add_attr_nest_end(struct nlmsghdr *n, struct rtattr *nest) |
| 1698 | { |
| 1699 | |
| 1700 | nest->rta_len = (unsigned short)((char *)NLMSG_TAIL(n) - (char *)nest); |
| 1701 | } |
| 1702 | |
| 1703 | static int |
| 1704 | if_disable_autolinklocal(struct dhcpcd_ctx *ctx, int ifindex) |
| 1705 | { |
| 1706 | struct nlml nlm; |
| 1707 | struct rtattr *afs, *afs6; |
| 1708 | |
| 1709 | memset(&nlm, 0, sizeof(nlm)); |
| 1710 | nlm.hdr.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg)); |
| 1711 | nlm.hdr.nlmsg_type = RTM_NEWLINK; |
| 1712 | nlm.hdr.nlmsg_flags = NLM_F_REQUEST; |
| 1713 | nlm.i.ifi_family = AF_INET6; |
| 1714 | nlm.i.ifi_index = ifindex; |
| 1715 | afs = add_attr_nest(&nlm.hdr, sizeof(nlm), IFLA_AF_SPEC); |
| 1716 | afs6 = add_attr_nest(&nlm.hdr, sizeof(nlm), AF_INET6); |
| 1717 | add_attr_8(&nlm.hdr, sizeof(nlm), IFLA_INET6_ADDR_GEN_MODE, |
| 1718 | IN6_ADDR_GEN_MODE_NONE); |
| 1719 | add_attr_nest_end(&nlm.hdr, afs6); |
| 1720 | add_attr_nest_end(&nlm.hdr, afs); |
| 1721 | |
| 1722 | return send_netlink(ctx, NULL, NETLINK_ROUTE, &nlm.hdr, NULL); |
| 1723 | } |
| 1724 | |
| 1725 | static const char *prefix = "/proc/sys/net/ipv6/conf"; |
| 1726 | |
| 1727 | int |
| 1728 | if_checkipv6(struct dhcpcd_ctx *ctx, const struct interface *ifp, int own) |
| 1729 | { |
| 1730 | const char *ifname; |
| 1731 | int ra; |
| 1732 | char path[256]; |
| 1733 | |
| 1734 | if (ifp == NULL) |
| 1735 | ifname = "all"; |
| 1736 | else if (own) { |
| 1737 | if (if_disable_autolinklocal(ctx, (int)ifp->index) == -1) |
| 1738 | logger(ctx, LOG_DEBUG, |
| 1739 | "%s: if_disable_autolinklocal: %m", ifp->name); |
| 1740 | } |
| 1741 | if (ifp) |
| 1742 | ifname = ifp->name; |
| 1743 | |
| 1744 | snprintf(path, sizeof(path), "%s/%s/autoconf", prefix, ifname); |
| 1745 | ra = check_proc_int(path); |
| 1746 | if (ra != 1) { |
| 1747 | if (!own) |
| 1748 | logger(ctx, LOG_WARNING, |
| 1749 | "%s: IPv6 kernel autoconf disabled", ifname); |
| 1750 | } else if (ra != -1 && own) { |
| 1751 | if (write_path(path, "0") == -1) { |
| 1752 | logger(ctx, LOG_ERR, "write_path: %s: %m", path); |
| 1753 | return -1; |
| 1754 | } |
| 1755 | } |
| 1756 | |
| 1757 | snprintf(path, sizeof(path), "%s/%s/accept_ra", prefix, ifname); |
| 1758 | ra = check_proc_int(path); |
| 1759 | if (ra == -1) |
| 1760 | /* The sysctl probably doesn't exist, but this isn't an |
| 1761 | * error as such so just log it and continue */ |
| 1762 | logger(ctx, errno == ENOENT ? LOG_DEBUG : LOG_WARNING, |
| 1763 | "%s: %m", path); |
| 1764 | else if (ra != 0 && own) { |
| 1765 | logger(ctx, LOG_DEBUG, "%s: disabling kernel IPv6 RA support", |
| 1766 | ifname); |
| 1767 | if (write_path(path, "0") == -1) { |
| 1768 | logger(ctx, LOG_ERR, "write_path: %s: %m", path); |
| 1769 | return ra; |
| 1770 | } |
| 1771 | return 0; |
| 1772 | } |
| 1773 | |
| 1774 | return ra; |
| 1775 | } |
| 1776 | |
| 1777 | #ifdef IPV6_MANAGETEMPADDR |
| 1778 | int |
| 1779 | ip6_use_tempaddr(const char *ifname) |
| 1780 | { |
| 1781 | char path[256]; |
| 1782 | int val; |
| 1783 | |
| 1784 | if (ifname == NULL) |
| 1785 | ifname = "all"; |
| 1786 | snprintf(path, sizeof(path), "%s/%s/use_tempaddr", prefix, ifname); |
| 1787 | val = check_proc_int(path); |
| 1788 | return val == -1 ? 0 : val; |
| 1789 | } |
| 1790 | |
| 1791 | int |
| 1792 | ip6_temp_preferred_lifetime(const char *ifname) |
| 1793 | { |
| 1794 | char path[256]; |
| 1795 | int val; |
| 1796 | |
| 1797 | if (ifname == NULL) |
| 1798 | ifname = "all"; |
| 1799 | snprintf(path, sizeof(path), "%s/%s/temp_prefered_lft", prefix, |
| 1800 | ifname); |
| 1801 | val = check_proc_int(path); |
| 1802 | return val < 0 ? TEMP_PREFERRED_LIFETIME : val; |
| 1803 | } |
| 1804 | |
| 1805 | int |
| 1806 | ip6_temp_valid_lifetime(const char *ifname) |
| 1807 | { |
| 1808 | char path[256]; |
| 1809 | int val; |
| 1810 | |
| 1811 | if (ifname == NULL) |
| 1812 | ifname = "all"; |
| 1813 | snprintf(path, sizeof(path), "%s/%s/temp_valid_lft", prefix, ifname); |
| 1814 | val = check_proc_int(path); |
| 1815 | return val < 0 ? TEMP_VALID_LIFETIME : val; |
| 1816 | } |
| 1817 | #endif /* IPV6_MANAGETEMPADDR */ |
| 1818 | #endif /* INET6 */ |