osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 1 | /* |
| 2 | * iplink.c "ip link". |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation; either version |
| 7 | * 2 of the License, or (at your option) any later version. |
| 8 | * |
| 9 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> |
| 10 | * |
| 11 | */ |
| 12 | |
| 13 | #include <stdio.h> |
| 14 | #include <stdlib.h> |
| 15 | #include <unistd.h> |
| 16 | #include <syslog.h> |
| 17 | #include <fcntl.h> |
| 18 | #include <errno.h> |
| 19 | #include <sys/socket.h> |
| 20 | #include <linux/if.h> |
| 21 | #include <linux/if_packet.h> |
| 22 | #include <linux/if_ether.h> |
| 23 | #include <linux/sockios.h> |
| 24 | #include <netinet/in.h> |
| 25 | #include <arpa/inet.h> |
| 26 | #include <string.h> |
| 27 | #include <sys/ioctl.h> |
| 28 | #include <linux/sockios.h> |
| 29 | |
| 30 | #include "rt_names.h" |
| 31 | #include "utils.h" |
| 32 | #include "ip_common.h" |
| 33 | |
| 34 | |
| 35 | static void usage(void) __attribute__((noreturn)); |
| 36 | |
| 37 | void iplink_usage(void) |
| 38 | { |
net[shemminger]!shemminger | d27b1b5 | 2004-07-01 22:15:50 +0000 | [diff] [blame] | 39 | fprintf(stderr, "Usage: ip link set DEVICE { up | down |\n"); |
| 40 | fprintf(stderr, " arp { on | off } |\n"); |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 41 | fprintf(stderr, " dynamic { on | off } |\n"); |
net[shemminger]!shemminger | d27b1b5 | 2004-07-01 22:15:50 +0000 | [diff] [blame] | 42 | fprintf(stderr, " multicast { on | off } |\n"); |
| 43 | fprintf(stderr, " allmulticast { on | off } |\n"); |
| 44 | fprintf(stderr, " promisc { on | off } |\n"); |
| 45 | fprintf(stderr, " trailers { on | off } |\n"); |
| 46 | fprintf(stderr, " txqueuelen PACKETS |\n"); |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 47 | fprintf(stderr, " name NEWNAME |\n"); |
| 48 | fprintf(stderr, " address LLADDR | broadcast LLADDR |\n"); |
| 49 | fprintf(stderr, " mtu MTU }\n"); |
| 50 | fprintf(stderr, " ip link show [ DEVICE ]\n"); |
| 51 | exit(-1); |
| 52 | } |
| 53 | |
| 54 | static void usage(void) |
| 55 | { |
| 56 | iplink_usage(); |
| 57 | } |
| 58 | |
| 59 | static int on_off(char *msg) |
| 60 | { |
| 61 | fprintf(stderr, "Error: argument of \"%s\" must be \"on\" or \"off\"\n", msg); |
| 62 | return -1; |
| 63 | } |
| 64 | |
| 65 | static int get_ctl_fd(void) |
| 66 | { |
| 67 | int s_errno; |
| 68 | int fd; |
| 69 | |
| 70 | fd = socket(PF_INET, SOCK_DGRAM, 0); |
| 71 | if (fd >= 0) |
| 72 | return fd; |
| 73 | s_errno = errno; |
| 74 | fd = socket(PF_PACKET, SOCK_DGRAM, 0); |
| 75 | if (fd >= 0) |
| 76 | return fd; |
| 77 | fd = socket(PF_INET6, SOCK_DGRAM, 0); |
| 78 | if (fd >= 0) |
| 79 | return fd; |
| 80 | errno = s_errno; |
| 81 | perror("Cannot create control socket"); |
| 82 | return -1; |
| 83 | } |
| 84 | |
osdl.net!shemminger | 71058eb | 2004-09-01 17:15:45 +0000 | [diff] [blame] | 85 | static int do_chflags(const char *dev, __u32 flags, __u32 mask) |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 86 | { |
| 87 | struct ifreq ifr; |
| 88 | int fd; |
| 89 | int err; |
| 90 | |
osdl.net!shemminger | 71058eb | 2004-09-01 17:15:45 +0000 | [diff] [blame] | 91 | strncpy(ifr.ifr_name, dev, IFNAMSIZ); |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 92 | fd = get_ctl_fd(); |
| 93 | if (fd < 0) |
| 94 | return -1; |
| 95 | err = ioctl(fd, SIOCGIFFLAGS, &ifr); |
| 96 | if (err) { |
| 97 | perror("SIOCGIFFLAGS"); |
| 98 | close(fd); |
| 99 | return -1; |
| 100 | } |
| 101 | if ((ifr.ifr_flags^flags)&mask) { |
| 102 | ifr.ifr_flags &= ~mask; |
| 103 | ifr.ifr_flags |= mask&flags; |
| 104 | err = ioctl(fd, SIOCSIFFLAGS, &ifr); |
| 105 | if (err) |
| 106 | perror("SIOCSIFFLAGS"); |
| 107 | } |
| 108 | close(fd); |
| 109 | return err; |
| 110 | } |
| 111 | |
osdl.net!shemminger | 71058eb | 2004-09-01 17:15:45 +0000 | [diff] [blame] | 112 | static int do_changename(const char *dev, const char *newdev) |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 113 | { |
| 114 | struct ifreq ifr; |
| 115 | int fd; |
| 116 | int err; |
| 117 | |
osdl.net!shemminger | 71058eb | 2004-09-01 17:15:45 +0000 | [diff] [blame] | 118 | strncpy(ifr.ifr_name, dev, IFNAMSIZ); |
| 119 | strncpy(ifr.ifr_newname, newdev, IFNAMSIZ); |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 120 | fd = get_ctl_fd(); |
| 121 | if (fd < 0) |
| 122 | return -1; |
| 123 | err = ioctl(fd, SIOCSIFNAME, &ifr); |
| 124 | if (err) { |
| 125 | perror("SIOCSIFNAME"); |
| 126 | close(fd); |
| 127 | return -1; |
| 128 | } |
| 129 | close(fd); |
| 130 | return err; |
| 131 | } |
| 132 | |
osdl.net!shemminger | 71058eb | 2004-09-01 17:15:45 +0000 | [diff] [blame] | 133 | static int set_qlen(const char *dev, int qlen) |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 134 | { |
| 135 | struct ifreq ifr; |
| 136 | int s; |
| 137 | |
| 138 | s = get_ctl_fd(); |
| 139 | if (s < 0) |
| 140 | return -1; |
| 141 | |
| 142 | memset(&ifr, 0, sizeof(ifr)); |
Stephen Hemminger | ae665a5 | 2006-12-05 10:10:22 -0800 | [diff] [blame^] | 143 | strncpy(ifr.ifr_name, dev, IFNAMSIZ); |
| 144 | ifr.ifr_qlen = qlen; |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 145 | if (ioctl(s, SIOCSIFTXQLEN, &ifr) < 0) { |
| 146 | perror("SIOCSIFXQLEN"); |
| 147 | close(s); |
| 148 | return -1; |
| 149 | } |
| 150 | close(s); |
| 151 | |
Stephen Hemminger | ae665a5 | 2006-12-05 10:10:22 -0800 | [diff] [blame^] | 152 | return 0; |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 153 | } |
| 154 | |
osdl.net!shemminger | 71058eb | 2004-09-01 17:15:45 +0000 | [diff] [blame] | 155 | static int set_mtu(const char *dev, int mtu) |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 156 | { |
| 157 | struct ifreq ifr; |
| 158 | int s; |
| 159 | |
| 160 | s = get_ctl_fd(); |
| 161 | if (s < 0) |
| 162 | return -1; |
| 163 | |
| 164 | memset(&ifr, 0, sizeof(ifr)); |
Stephen Hemminger | ae665a5 | 2006-12-05 10:10:22 -0800 | [diff] [blame^] | 165 | strncpy(ifr.ifr_name, dev, IFNAMSIZ); |
| 166 | ifr.ifr_mtu = mtu; |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 167 | if (ioctl(s, SIOCSIFMTU, &ifr) < 0) { |
| 168 | perror("SIOCSIFMTU"); |
| 169 | close(s); |
| 170 | return -1; |
| 171 | } |
| 172 | close(s); |
| 173 | |
Stephen Hemminger | ae665a5 | 2006-12-05 10:10:22 -0800 | [diff] [blame^] | 174 | return 0; |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 175 | } |
| 176 | |
osdl.net!shemminger | 71058eb | 2004-09-01 17:15:45 +0000 | [diff] [blame] | 177 | static int get_address(const char *dev, int *htype) |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 178 | { |
| 179 | struct ifreq ifr; |
| 180 | struct sockaddr_ll me; |
shemminger | f332d16 | 2005-07-05 22:37:15 +0000 | [diff] [blame] | 181 | socklen_t alen; |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 182 | int s; |
| 183 | |
| 184 | s = socket(PF_PACKET, SOCK_DGRAM, 0); |
Stephen Hemminger | ae665a5 | 2006-12-05 10:10:22 -0800 | [diff] [blame^] | 185 | if (s < 0) { |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 186 | perror("socket(PF_PACKET)"); |
| 187 | return -1; |
| 188 | } |
| 189 | |
| 190 | memset(&ifr, 0, sizeof(ifr)); |
osdl.net!shemminger | 71058eb | 2004-09-01 17:15:45 +0000 | [diff] [blame] | 191 | strncpy(ifr.ifr_name, dev, IFNAMSIZ); |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 192 | if (ioctl(s, SIOCGIFINDEX, &ifr) < 0) { |
| 193 | perror("SIOCGIFINDEX"); |
| 194 | close(s); |
| 195 | return -1; |
| 196 | } |
| 197 | |
| 198 | memset(&me, 0, sizeof(me)); |
| 199 | me.sll_family = AF_PACKET; |
| 200 | me.sll_ifindex = ifr.ifr_ifindex; |
| 201 | me.sll_protocol = htons(ETH_P_LOOP); |
| 202 | if (bind(s, (struct sockaddr*)&me, sizeof(me)) == -1) { |
| 203 | perror("bind"); |
| 204 | close(s); |
| 205 | return -1; |
| 206 | } |
| 207 | |
| 208 | alen = sizeof(me); |
| 209 | if (getsockname(s, (struct sockaddr*)&me, &alen) == -1) { |
| 210 | perror("getsockname"); |
| 211 | close(s); |
| 212 | return -1; |
| 213 | } |
| 214 | close(s); |
| 215 | *htype = me.sll_hatype; |
| 216 | return me.sll_halen; |
| 217 | } |
| 218 | |
Stephen Hemminger | ae665a5 | 2006-12-05 10:10:22 -0800 | [diff] [blame^] | 219 | static int parse_address(const char *dev, int hatype, int halen, |
shemminger | 7b56575 | 2006-03-21 23:57:50 +0000 | [diff] [blame] | 220 | char *lla, struct ifreq *ifr) |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 221 | { |
| 222 | int alen; |
| 223 | |
| 224 | memset(ifr, 0, sizeof(*ifr)); |
osdl.net!shemminger | 71058eb | 2004-09-01 17:15:45 +0000 | [diff] [blame] | 225 | strncpy(ifr->ifr_name, dev, IFNAMSIZ); |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 226 | ifr->ifr_hwaddr.sa_family = hatype; |
| 227 | alen = ll_addr_a2n(ifr->ifr_hwaddr.sa_data, 14, lla); |
| 228 | if (alen < 0) |
| 229 | return -1; |
| 230 | if (alen != halen) { |
| 231 | fprintf(stderr, "Wrong address (%s) length: expected %d bytes\n", lla, halen); |
| 232 | return -1; |
| 233 | } |
Stephen Hemminger | ae665a5 | 2006-12-05 10:10:22 -0800 | [diff] [blame^] | 234 | return 0; |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 235 | } |
| 236 | |
| 237 | static int set_address(struct ifreq *ifr, int brd) |
| 238 | { |
| 239 | int s; |
| 240 | |
| 241 | s = get_ctl_fd(); |
| 242 | if (s < 0) |
| 243 | return -1; |
| 244 | if (ioctl(s, brd?SIOCSIFHWBROADCAST:SIOCSIFHWADDR, ifr) < 0) { |
| 245 | perror(brd?"SIOCSIFHWBROADCAST":"SIOCSIFHWADDR"); |
| 246 | close(s); |
| 247 | return -1; |
| 248 | } |
| 249 | close(s); |
Stephen Hemminger | ae665a5 | 2006-12-05 10:10:22 -0800 | [diff] [blame^] | 250 | return 0; |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 251 | } |
| 252 | |
| 253 | |
| 254 | static int do_set(int argc, char **argv) |
| 255 | { |
| 256 | char *dev = NULL; |
| 257 | __u32 mask = 0; |
| 258 | __u32 flags = 0; |
| 259 | int qlen = -1; |
| 260 | int mtu = -1; |
| 261 | char *newaddr = NULL; |
| 262 | char *newbrd = NULL; |
| 263 | struct ifreq ifr0, ifr1; |
| 264 | char *newname = NULL; |
| 265 | int htype, halen; |
| 266 | |
| 267 | while (argc > 0) { |
| 268 | if (strcmp(*argv, "up") == 0) { |
| 269 | mask |= IFF_UP; |
| 270 | flags |= IFF_UP; |
| 271 | } else if (strcmp(*argv, "down") == 0) { |
| 272 | mask |= IFF_UP; |
| 273 | flags &= ~IFF_UP; |
| 274 | } else if (strcmp(*argv, "name") == 0) { |
| 275 | NEXT_ARG(); |
| 276 | newname = *argv; |
| 277 | } else if (matches(*argv, "address") == 0) { |
| 278 | NEXT_ARG(); |
| 279 | newaddr = *argv; |
| 280 | } else if (matches(*argv, "broadcast") == 0 || |
| 281 | strcmp(*argv, "brd") == 0) { |
| 282 | NEXT_ARG(); |
| 283 | newbrd = *argv; |
| 284 | } else if (matches(*argv, "txqueuelen") == 0 || |
| 285 | strcmp(*argv, "qlen") == 0 || |
| 286 | matches(*argv, "txqlen") == 0) { |
| 287 | NEXT_ARG(); |
| 288 | if (qlen != -1) |
| 289 | duparg("txqueuelen", *argv); |
| 290 | if (get_integer(&qlen, *argv, 0)) |
| 291 | invarg("Invalid \"txqueuelen\" value\n", *argv); |
| 292 | } else if (strcmp(*argv, "mtu") == 0) { |
| 293 | NEXT_ARG(); |
| 294 | if (mtu != -1) |
| 295 | duparg("mtu", *argv); |
| 296 | if (get_integer(&mtu, *argv, 0)) |
| 297 | invarg("Invalid \"mtu\" value\n", *argv); |
| 298 | } else if (strcmp(*argv, "multicast") == 0) { |
| 299 | NEXT_ARG(); |
| 300 | mask |= IFF_MULTICAST; |
| 301 | if (strcmp(*argv, "on") == 0) { |
| 302 | flags |= IFF_MULTICAST; |
| 303 | } else if (strcmp(*argv, "off") == 0) { |
| 304 | flags &= ~IFF_MULTICAST; |
| 305 | } else |
| 306 | return on_off("multicast"); |
net[shemminger]!shemminger | d27b1b5 | 2004-07-01 22:15:50 +0000 | [diff] [blame] | 307 | } else if (strcmp(*argv, "allmulticast") == 0) { |
| 308 | NEXT_ARG(); |
| 309 | mask |= IFF_ALLMULTI; |
| 310 | if (strcmp(*argv, "on") == 0) { |
| 311 | flags |= IFF_ALLMULTI; |
| 312 | } else if (strcmp(*argv, "off") == 0) { |
| 313 | flags &= ~IFF_ALLMULTI; |
| 314 | } else |
| 315 | return on_off("allmulticast"); |
| 316 | } else if (strcmp(*argv, "promisc") == 0) { |
| 317 | NEXT_ARG(); |
| 318 | mask |= IFF_PROMISC; |
| 319 | if (strcmp(*argv, "on") == 0) { |
| 320 | flags |= IFF_PROMISC; |
| 321 | } else if (strcmp(*argv, "off") == 0) { |
| 322 | flags &= ~IFF_PROMISC; |
| 323 | } else |
| 324 | return on_off("promisc"); |
| 325 | } else if (strcmp(*argv, "trailers") == 0) { |
| 326 | NEXT_ARG(); |
| 327 | mask |= IFF_NOTRAILERS; |
| 328 | if (strcmp(*argv, "off") == 0) { |
| 329 | flags |= IFF_NOTRAILERS; |
| 330 | } else if (strcmp(*argv, "on") == 0) { |
| 331 | flags &= ~IFF_NOTRAILERS; |
| 332 | } else |
| 333 | return on_off("trailers"); |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 334 | } else if (strcmp(*argv, "arp") == 0) { |
| 335 | NEXT_ARG(); |
| 336 | mask |= IFF_NOARP; |
| 337 | if (strcmp(*argv, "on") == 0) { |
| 338 | flags &= ~IFF_NOARP; |
| 339 | } else if (strcmp(*argv, "off") == 0) { |
| 340 | flags |= IFF_NOARP; |
| 341 | } else |
| 342 | return on_off("noarp"); |
| 343 | #ifdef IFF_DYNAMIC |
| 344 | } else if (matches(*argv, "dynamic") == 0) { |
| 345 | NEXT_ARG(); |
| 346 | mask |= IFF_DYNAMIC; |
| 347 | if (strcmp(*argv, "on") == 0) { |
| 348 | flags |= IFF_DYNAMIC; |
| 349 | } else if (strcmp(*argv, "off") == 0) { |
| 350 | flags &= ~IFF_DYNAMIC; |
| 351 | } else |
| 352 | return on_off("dynamic"); |
| 353 | #endif |
| 354 | } else { |
| 355 | if (strcmp(*argv, "dev") == 0) { |
| 356 | NEXT_ARG(); |
| 357 | } |
| 358 | if (matches(*argv, "help") == 0) |
| 359 | usage(); |
| 360 | if (dev) |
| 361 | duparg2("dev", *argv); |
| 362 | dev = *argv; |
| 363 | } |
| 364 | argc--; argv++; |
| 365 | } |
| 366 | |
| 367 | if (!dev) { |
| 368 | fprintf(stderr, "Not enough of information: \"dev\" argument is required.\n"); |
| 369 | exit(-1); |
| 370 | } |
| 371 | |
| 372 | if (newaddr || newbrd) { |
| 373 | halen = get_address(dev, &htype); |
| 374 | if (halen < 0) |
| 375 | return -1; |
| 376 | if (newaddr) { |
| 377 | if (parse_address(dev, htype, halen, newaddr, &ifr0) < 0) |
| 378 | return -1; |
| 379 | } |
| 380 | if (newbrd) { |
| 381 | if (parse_address(dev, htype, halen, newbrd, &ifr1) < 0) |
Stephen Hemminger | ae665a5 | 2006-12-05 10:10:22 -0800 | [diff] [blame^] | 382 | return -1; |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 383 | } |
| 384 | } |
| 385 | |
| 386 | if (newname && strcmp(dev, newname)) { |
| 387 | if (do_changename(dev, newname) < 0) |
| 388 | return -1; |
| 389 | dev = newname; |
| 390 | } |
Stephen Hemminger | ae665a5 | 2006-12-05 10:10:22 -0800 | [diff] [blame^] | 391 | if (qlen != -1) { |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 392 | if (set_qlen(dev, qlen) < 0) |
Stephen Hemminger | ae665a5 | 2006-12-05 10:10:22 -0800 | [diff] [blame^] | 393 | return -1; |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 394 | } |
Stephen Hemminger | ae665a5 | 2006-12-05 10:10:22 -0800 | [diff] [blame^] | 395 | if (mtu != -1) { |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 396 | if (set_mtu(dev, mtu) < 0) |
Stephen Hemminger | ae665a5 | 2006-12-05 10:10:22 -0800 | [diff] [blame^] | 397 | return -1; |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 398 | } |
| 399 | if (newaddr || newbrd) { |
| 400 | if (newbrd) { |
| 401 | if (set_address(&ifr1, 1) < 0) |
Stephen Hemminger | ae665a5 | 2006-12-05 10:10:22 -0800 | [diff] [blame^] | 402 | return -1; |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 403 | } |
| 404 | if (newaddr) { |
| 405 | if (set_address(&ifr0, 0) < 0) |
| 406 | return -1; |
| 407 | } |
| 408 | } |
| 409 | if (mask) |
| 410 | return do_chflags(dev, flags, mask); |
| 411 | return 0; |
| 412 | } |
| 413 | |
| 414 | int do_iplink(int argc, char **argv) |
| 415 | { |
| 416 | if (argc > 0) { |
| 417 | if (matches(*argv, "set") == 0) |
| 418 | return do_set(argc-1, argv+1); |
| 419 | if (matches(*argv, "show") == 0 || |
| 420 | matches(*argv, "lst") == 0 || |
| 421 | matches(*argv, "list") == 0) |
| 422 | return ipaddr_list_link(argc-1, argv+1); |
| 423 | if (matches(*argv, "help") == 0) |
| 424 | usage(); |
| 425 | } else |
| 426 | return ipaddr_list_link(0, NULL); |
| 427 | |
| 428 | fprintf(stderr, "Command \"%s\" is unknown, try \"ip link help\".\n", *argv); |
| 429 | exit(-1); |
| 430 | } |