Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +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 | |
Glenn L McGrath | 275be87 | 2002-12-16 07:37:21 +0000 | [diff] [blame] | 13 | #include <sys/ioctl.h> |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 14 | #include <sys/socket.h> |
Glenn L McGrath | 275be87 | 2002-12-16 07:37:21 +0000 | [diff] [blame] | 15 | |
| 16 | #include <errno.h> |
| 17 | #include <stdlib.h> |
| 18 | #include <string.h> |
| 19 | #include <unistd.h> |
| 20 | |
Eric Andersen | ab4e19a | 2003-01-14 08:54:08 +0000 | [diff] [blame] | 21 | #include <net/if.h> |
| 22 | #include <net/if_packet.h> |
| 23 | #include <netpacket/packet.h> |
| 24 | |
| 25 | #if __GLIBC__ >=2 && __GLIBC_MINOR >= 1 |
| 26 | #include <net/ethernet.h> |
| 27 | #else |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 28 | #include <linux/if_ether.h> |
Eric Andersen | ab4e19a | 2003-01-14 08:54:08 +0000 | [diff] [blame] | 29 | #endif |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 30 | |
| 31 | #include "rt_names.h" |
| 32 | #include "utils.h" |
| 33 | #include "ip_common.h" |
| 34 | |
Glenn L McGrath | 275be87 | 2002-12-16 07:37:21 +0000 | [diff] [blame] | 35 | #include "libbb.h" |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 36 | |
Eric Andersen | ab4e19a | 2003-01-14 08:54:08 +0000 | [diff] [blame] | 37 | |
| 38 | /* take from linux/sockios.h */ |
| 39 | #define SIOCSIFNAME 0x8923 /* set interface name */ |
| 40 | |
Glenn L McGrath | 2626ef6 | 2002-12-02 01:40:05 +0000 | [diff] [blame] | 41 | static int do_link; |
| 42 | |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 43 | static int on_off(char *msg) |
| 44 | { |
Glenn L McGrath | 9048ae5 | 2002-11-28 10:56:38 +0000 | [diff] [blame] | 45 | error_msg("Error: argument of \"%s\" must be \"on\" or \"off\"", msg); |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 46 | return -1; |
| 47 | } |
| 48 | |
| 49 | static int get_ctl_fd(void) |
| 50 | { |
| 51 | int s_errno; |
| 52 | int fd; |
| 53 | |
| 54 | fd = socket(PF_INET, SOCK_DGRAM, 0); |
| 55 | if (fd >= 0) |
| 56 | return fd; |
| 57 | s_errno = errno; |
| 58 | fd = socket(PF_PACKET, SOCK_DGRAM, 0); |
| 59 | if (fd >= 0) |
| 60 | return fd; |
| 61 | fd = socket(PF_INET6, SOCK_DGRAM, 0); |
| 62 | if (fd >= 0) |
| 63 | return fd; |
| 64 | errno = s_errno; |
| 65 | perror("Cannot create control socket"); |
| 66 | return -1; |
| 67 | } |
| 68 | |
| 69 | static int do_chflags(char *dev, __u32 flags, __u32 mask) |
| 70 | { |
| 71 | struct ifreq ifr; |
| 72 | int fd; |
| 73 | int err; |
| 74 | |
| 75 | strcpy(ifr.ifr_name, dev); |
| 76 | fd = get_ctl_fd(); |
| 77 | if (fd < 0) |
| 78 | return -1; |
| 79 | err = ioctl(fd, SIOCGIFFLAGS, &ifr); |
| 80 | if (err) { |
| 81 | perror("SIOCGIFFLAGS"); |
| 82 | close(fd); |
| 83 | return -1; |
| 84 | } |
| 85 | if ((ifr.ifr_flags^flags)&mask) { |
| 86 | ifr.ifr_flags &= ~mask; |
| 87 | ifr.ifr_flags |= mask&flags; |
| 88 | err = ioctl(fd, SIOCSIFFLAGS, &ifr); |
| 89 | if (err) |
| 90 | perror("SIOCSIFFLAGS"); |
| 91 | } |
| 92 | close(fd); |
| 93 | return err; |
| 94 | } |
| 95 | |
| 96 | static int do_changename(char *dev, char *newdev) |
| 97 | { |
| 98 | struct ifreq ifr; |
| 99 | int fd; |
| 100 | int err; |
| 101 | |
| 102 | strcpy(ifr.ifr_name, dev); |
| 103 | strcpy(ifr.ifr_newname, newdev); |
| 104 | fd = get_ctl_fd(); |
| 105 | if (fd < 0) |
| 106 | return -1; |
| 107 | err = ioctl(fd, SIOCSIFNAME, &ifr); |
| 108 | if (err) { |
| 109 | perror("SIOCSIFNAME"); |
| 110 | close(fd); |
| 111 | return -1; |
| 112 | } |
| 113 | close(fd); |
| 114 | return err; |
| 115 | } |
| 116 | |
| 117 | static int set_qlen(char *dev, int qlen) |
| 118 | { |
| 119 | struct ifreq ifr; |
| 120 | int s; |
| 121 | |
| 122 | s = get_ctl_fd(); |
| 123 | if (s < 0) |
| 124 | return -1; |
| 125 | |
| 126 | memset(&ifr, 0, sizeof(ifr)); |
| 127 | strcpy(ifr.ifr_name, dev); |
| 128 | ifr.ifr_qlen = qlen; |
| 129 | if (ioctl(s, SIOCSIFTXQLEN, &ifr) < 0) { |
| 130 | perror("SIOCSIFXQLEN"); |
| 131 | close(s); |
| 132 | return -1; |
| 133 | } |
| 134 | close(s); |
| 135 | |
| 136 | return 0; |
| 137 | } |
| 138 | |
| 139 | static int set_mtu(char *dev, int mtu) |
| 140 | { |
| 141 | struct ifreq ifr; |
| 142 | int s; |
| 143 | |
| 144 | s = get_ctl_fd(); |
| 145 | if (s < 0) |
| 146 | return -1; |
| 147 | |
| 148 | memset(&ifr, 0, sizeof(ifr)); |
| 149 | strcpy(ifr.ifr_name, dev); |
| 150 | ifr.ifr_mtu = mtu; |
| 151 | if (ioctl(s, SIOCSIFMTU, &ifr) < 0) { |
| 152 | perror("SIOCSIFMTU"); |
| 153 | close(s); |
| 154 | return -1; |
| 155 | } |
| 156 | close(s); |
| 157 | |
| 158 | return 0; |
| 159 | } |
| 160 | |
| 161 | static int get_address(char *dev, int *htype) |
| 162 | { |
| 163 | struct ifreq ifr; |
| 164 | struct sockaddr_ll me; |
| 165 | int alen; |
| 166 | int s; |
| 167 | |
| 168 | s = socket(PF_PACKET, SOCK_DGRAM, 0); |
| 169 | if (s < 0) { |
| 170 | perror("socket(PF_PACKET)"); |
| 171 | return -1; |
| 172 | } |
| 173 | |
| 174 | memset(&ifr, 0, sizeof(ifr)); |
| 175 | strcpy(ifr.ifr_name, dev); |
| 176 | if (ioctl(s, SIOCGIFINDEX, &ifr) < 0) { |
| 177 | perror("SIOCGIFINDEX"); |
| 178 | close(s); |
| 179 | return -1; |
| 180 | } |
| 181 | |
| 182 | memset(&me, 0, sizeof(me)); |
| 183 | me.sll_family = AF_PACKET; |
| 184 | me.sll_ifindex = ifr.ifr_ifindex; |
| 185 | me.sll_protocol = htons(ETH_P_LOOP); |
| 186 | if (bind(s, (struct sockaddr*)&me, sizeof(me)) == -1) { |
| 187 | perror("bind"); |
| 188 | close(s); |
| 189 | return -1; |
| 190 | } |
| 191 | |
| 192 | alen = sizeof(me); |
| 193 | if (getsockname(s, (struct sockaddr*)&me, &alen) == -1) { |
| 194 | perror("getsockname"); |
| 195 | close(s); |
| 196 | return -1; |
| 197 | } |
| 198 | close(s); |
| 199 | *htype = me.sll_hatype; |
| 200 | return me.sll_halen; |
| 201 | } |
| 202 | |
| 203 | static int parse_address(char *dev, int hatype, int halen, char *lla, struct ifreq *ifr) |
| 204 | { |
| 205 | int alen; |
| 206 | |
| 207 | memset(ifr, 0, sizeof(*ifr)); |
| 208 | strcpy(ifr->ifr_name, dev); |
| 209 | ifr->ifr_hwaddr.sa_family = hatype; |
| 210 | alen = ll_addr_a2n(ifr->ifr_hwaddr.sa_data, 14, lla); |
| 211 | if (alen < 0) |
| 212 | return -1; |
| 213 | if (alen != halen) { |
Glenn L McGrath | 9048ae5 | 2002-11-28 10:56:38 +0000 | [diff] [blame] | 214 | error_msg("Wrong address (%s) length: expected %d bytes", lla, halen); |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 215 | return -1; |
| 216 | } |
| 217 | return 0; |
| 218 | } |
| 219 | |
| 220 | static int set_address(struct ifreq *ifr, int brd) |
| 221 | { |
| 222 | int s; |
| 223 | |
| 224 | s = get_ctl_fd(); |
| 225 | if (s < 0) |
| 226 | return -1; |
| 227 | if (ioctl(s, brd?SIOCSIFHWBROADCAST:SIOCSIFHWADDR, ifr) < 0) { |
| 228 | perror(brd?"SIOCSIFHWBROADCAST":"SIOCSIFHWADDR"); |
| 229 | close(s); |
| 230 | return -1; |
| 231 | } |
| 232 | close(s); |
| 233 | return 0; |
| 234 | } |
| 235 | |
| 236 | |
| 237 | static int do_set(int argc, char **argv) |
| 238 | { |
| 239 | char *dev = NULL; |
| 240 | __u32 mask = 0; |
| 241 | __u32 flags = 0; |
| 242 | int qlen = -1; |
| 243 | int mtu = -1; |
| 244 | char *newaddr = NULL; |
| 245 | char *newbrd = NULL; |
| 246 | struct ifreq ifr0, ifr1; |
| 247 | char *newname = NULL; |
| 248 | int htype, halen; |
| 249 | |
| 250 | while (argc > 0) { |
| 251 | if (strcmp(*argv, "up") == 0) { |
| 252 | mask |= IFF_UP; |
| 253 | flags |= IFF_UP; |
| 254 | } else if (strcmp(*argv, "down") == 0) { |
| 255 | mask |= IFF_UP; |
| 256 | flags &= ~IFF_UP; |
| 257 | } else if (strcmp(*argv, "name") == 0) { |
| 258 | NEXT_ARG(); |
| 259 | newname = *argv; |
| 260 | } else if (strcmp(*argv, "mtu") == 0) { |
| 261 | NEXT_ARG(); |
| 262 | if (mtu != -1) |
| 263 | duparg("mtu", *argv); |
| 264 | if (get_integer(&mtu, *argv, 0)) |
| 265 | invarg("Invalid \"mtu\" value\n", *argv); |
| 266 | } else if (strcmp(*argv, "multicast") == 0) { |
| 267 | NEXT_ARG(); |
| 268 | mask |= IFF_MULTICAST; |
| 269 | if (strcmp(*argv, "on") == 0) { |
| 270 | flags |= IFF_MULTICAST; |
| 271 | } else if (strcmp(*argv, "off") == 0) { |
| 272 | flags &= ~IFF_MULTICAST; |
| 273 | } else |
| 274 | return on_off("multicast"); |
| 275 | } else if (strcmp(*argv, "arp") == 0) { |
| 276 | NEXT_ARG(); |
| 277 | mask |= IFF_NOARP; |
| 278 | if (strcmp(*argv, "on") == 0) { |
| 279 | flags &= ~IFF_NOARP; |
| 280 | } else if (strcmp(*argv, "off") == 0) { |
| 281 | flags |= IFF_NOARP; |
| 282 | } else |
| 283 | return on_off("noarp"); |
| 284 | } else { |
| 285 | if (strcmp(*argv, "dev") == 0) { |
| 286 | NEXT_ARG(); |
| 287 | } |
| 288 | if (dev) |
| 289 | duparg2("dev", *argv); |
| 290 | dev = *argv; |
| 291 | } |
| 292 | argc--; argv++; |
| 293 | } |
| 294 | |
| 295 | if (!dev) { |
Glenn L McGrath | 9048ae5 | 2002-11-28 10:56:38 +0000 | [diff] [blame] | 296 | error_msg("Not enough of information: \"dev\" argument is required."); |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 297 | exit(-1); |
| 298 | } |
| 299 | |
| 300 | if (newaddr || newbrd) { |
| 301 | halen = get_address(dev, &htype); |
| 302 | if (halen < 0) |
| 303 | return -1; |
| 304 | if (newaddr) { |
| 305 | if (parse_address(dev, htype, halen, newaddr, &ifr0) < 0) |
| 306 | return -1; |
| 307 | } |
| 308 | if (newbrd) { |
| 309 | if (parse_address(dev, htype, halen, newbrd, &ifr1) < 0) |
| 310 | return -1; |
| 311 | } |
| 312 | } |
| 313 | |
| 314 | if (newname && strcmp(dev, newname)) { |
| 315 | if (do_changename(dev, newname) < 0) |
| 316 | return -1; |
| 317 | dev = newname; |
| 318 | } |
| 319 | if (qlen != -1) { |
| 320 | if (set_qlen(dev, qlen) < 0) |
| 321 | return -1; |
| 322 | } |
| 323 | if (mtu != -1) { |
| 324 | if (set_mtu(dev, mtu) < 0) |
| 325 | return -1; |
| 326 | } |
| 327 | if (newaddr || newbrd) { |
| 328 | if (newbrd) { |
| 329 | if (set_address(&ifr1, 1) < 0) |
| 330 | return -1; |
| 331 | } |
| 332 | if (newaddr) { |
| 333 | if (set_address(&ifr0, 0) < 0) |
| 334 | return -1; |
| 335 | } |
| 336 | } |
| 337 | if (mask) |
| 338 | return do_chflags(dev, flags, mask); |
| 339 | return 0; |
| 340 | } |
| 341 | |
Glenn L McGrath | 2626ef6 | 2002-12-02 01:40:05 +0000 | [diff] [blame] | 342 | static int ipaddr_list_link(int argc, char **argv) |
| 343 | { |
| 344 | preferred_family = AF_PACKET; |
| 345 | do_link = 1; |
Glenn L McGrath | d66370c | 2003-01-13 21:40:38 +0000 | [diff] [blame] | 346 | return ipaddr_list_or_flush(argc, argv, 0); |
Glenn L McGrath | 2626ef6 | 2002-12-02 01:40:05 +0000 | [diff] [blame] | 347 | } |
| 348 | |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 349 | int do_iplink(int argc, char **argv) |
| 350 | { |
| 351 | if (argc > 0) { |
| 352 | if (matches(*argv, "set") == 0) |
| 353 | return do_set(argc-1, argv+1); |
| 354 | if (matches(*argv, "show") == 0 || |
| 355 | matches(*argv, "lst") == 0 || |
| 356 | matches(*argv, "list") == 0) |
| 357 | return ipaddr_list_link(argc-1, argv+1); |
| 358 | } else |
| 359 | return ipaddr_list_link(0, NULL); |
| 360 | |
Glenn L McGrath | 9048ae5 | 2002-11-28 10:56:38 +0000 | [diff] [blame] | 361 | error_msg("Command \"%s\" is unknown, try \"ip link help\".", *argv); |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 362 | exit(-1); |
| 363 | } |