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.
9 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
19 #include <sys/socket.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>
27 #include <sys/ioctl.h>
28 #include <linux/sockios.h>
32 #include "ip_common.h"
35 static void usage(void) __attribute__((noreturn));
37 void iplink_usage(void)
39 fprintf(stderr, "Usage: ip link set DEVICE { up | down | arp { on | off } |\n");
40 fprintf(stderr, " dynamic { on | off } |\n");
41 fprintf(stderr, " multicast { on | off } | txqueuelen PACKETS |\n");
42 fprintf(stderr, " name NEWNAME |\n");
43 fprintf(stderr, " address LLADDR | broadcast LLADDR |\n");
44 fprintf(stderr, " mtu MTU }\n");
45 fprintf(stderr, " ip link show [ DEVICE ]\n");
49 static void usage(void)
54 static int on_off(char *msg)
56 fprintf(stderr, "Error: argument of \"%s\" must be \"on\" or \"off\"\n", msg);
60 static int get_ctl_fd(void)
65 fd = socket(PF_INET, SOCK_DGRAM, 0);
69 fd = socket(PF_PACKET, SOCK_DGRAM, 0);
72 fd = socket(PF_INET6, SOCK_DGRAM, 0);
76 perror("Cannot create control socket");
80 static int do_chflags(char *dev, __u32 flags, __u32 mask)
86 strcpy(ifr.ifr_name, dev);
90 err = ioctl(fd, SIOCGIFFLAGS, &ifr);
92 perror("SIOCGIFFLAGS");
96 if ((ifr.ifr_flags^flags)&mask) {
97 ifr.ifr_flags &= ~mask;
98 ifr.ifr_flags |= mask&flags;
99 err = ioctl(fd, SIOCSIFFLAGS, &ifr);
101 perror("SIOCSIFFLAGS");
107 static int do_changename(char *dev, char *newdev)
113 strcpy(ifr.ifr_name, dev);
114 strcpy(ifr.ifr_newname, newdev);
118 err = ioctl(fd, SIOCSIFNAME, &ifr);
120 perror("SIOCSIFNAME");
128 static int set_qlen(char *dev, int qlen)
137 memset(&ifr, 0, sizeof(ifr));
138 strcpy(ifr.ifr_name, dev);
140 if (ioctl(s, SIOCSIFTXQLEN, &ifr) < 0) {
141 perror("SIOCSIFXQLEN");
150 static int set_mtu(char *dev, int mtu)
159 memset(&ifr, 0, sizeof(ifr));
160 strcpy(ifr.ifr_name, dev);
162 if (ioctl(s, SIOCSIFMTU, &ifr) < 0) {
163 perror("SIOCSIFMTU");
172 static int get_address(char *dev, int *htype)
175 struct sockaddr_ll me;
179 s = socket(PF_PACKET, SOCK_DGRAM, 0);
181 perror("socket(PF_PACKET)");
185 memset(&ifr, 0, sizeof(ifr));
186 strcpy(ifr.ifr_name, dev);
187 if (ioctl(s, SIOCGIFINDEX, &ifr) < 0) {
188 perror("SIOCGIFINDEX");
193 memset(&me, 0, sizeof(me));
194 me.sll_family = AF_PACKET;
195 me.sll_ifindex = ifr.ifr_ifindex;
196 me.sll_protocol = htons(ETH_P_LOOP);
197 if (bind(s, (struct sockaddr*)&me, sizeof(me)) == -1) {
204 if (getsockname(s, (struct sockaddr*)&me, &alen) == -1) {
205 perror("getsockname");
210 *htype = me.sll_hatype;
214 static int parse_address(char *dev, int hatype, int halen, char *lla, struct ifreq *ifr)
218 memset(ifr, 0, sizeof(*ifr));
219 strcpy(ifr->ifr_name, dev);
220 ifr->ifr_hwaddr.sa_family = hatype;
221 alen = ll_addr_a2n(ifr->ifr_hwaddr.sa_data, 14, lla);
225 fprintf(stderr, "Wrong address (%s) length: expected %d bytes\n", lla, halen);
231 static int set_address(struct ifreq *ifr, int brd)
238 if (ioctl(s, brd?SIOCSIFHWBROADCAST:SIOCSIFHWADDR, ifr) < 0) {
239 perror(brd?"SIOCSIFHWBROADCAST":"SIOCSIFHWADDR");
248 static int do_set(int argc, char **argv)
255 char *newaddr = NULL;
257 struct ifreq ifr0, ifr1;
258 char *newname = NULL;
262 if (strcmp(*argv, "up") == 0) {
265 } else if (strcmp(*argv, "down") == 0) {
268 } else if (strcmp(*argv, "name") == 0) {
271 } else if (matches(*argv, "address") == 0) {
274 } else if (matches(*argv, "broadcast") == 0 ||
275 strcmp(*argv, "brd") == 0) {
278 } else if (matches(*argv, "txqueuelen") == 0 ||
279 strcmp(*argv, "qlen") == 0 ||
280 matches(*argv, "txqlen") == 0) {
283 duparg("txqueuelen", *argv);
284 if (get_integer(&qlen, *argv, 0))
285 invarg("Invalid \"txqueuelen\" value\n", *argv);
286 } else if (strcmp(*argv, "mtu") == 0) {
289 duparg("mtu", *argv);
290 if (get_integer(&mtu, *argv, 0))
291 invarg("Invalid \"mtu\" value\n", *argv);
292 } else if (strcmp(*argv, "multicast") == 0) {
294 mask |= IFF_MULTICAST;
295 if (strcmp(*argv, "on") == 0) {
296 flags |= IFF_MULTICAST;
297 } else if (strcmp(*argv, "off") == 0) {
298 flags &= ~IFF_MULTICAST;
300 return on_off("multicast");
301 } else if (strcmp(*argv, "arp") == 0) {
304 if (strcmp(*argv, "on") == 0) {
306 } else if (strcmp(*argv, "off") == 0) {
309 return on_off("noarp");
311 } else if (matches(*argv, "dynamic") == 0) {
314 if (strcmp(*argv, "on") == 0) {
315 flags |= IFF_DYNAMIC;
316 } else if (strcmp(*argv, "off") == 0) {
317 flags &= ~IFF_DYNAMIC;
319 return on_off("dynamic");
322 if (strcmp(*argv, "dev") == 0) {
325 if (matches(*argv, "help") == 0)
328 duparg2("dev", *argv);
335 fprintf(stderr, "Not enough of information: \"dev\" argument is required.\n");
339 if (newaddr || newbrd) {
340 halen = get_address(dev, &htype);
344 if (parse_address(dev, htype, halen, newaddr, &ifr0) < 0)
348 if (parse_address(dev, htype, halen, newbrd, &ifr1) < 0)
353 if (newname && strcmp(dev, newname)) {
354 if (do_changename(dev, newname) < 0)
359 if (set_qlen(dev, qlen) < 0)
363 if (set_mtu(dev, mtu) < 0)
366 if (newaddr || newbrd) {
368 if (set_address(&ifr1, 1) < 0)
372 if (set_address(&ifr0, 0) < 0)
377 return do_chflags(dev, flags, mask);
381 int do_iplink(int argc, char **argv)
384 if (matches(*argv, "set") == 0)
385 return do_set(argc-1, argv+1);
386 if (matches(*argv, "show") == 0 ||
387 matches(*argv, "lst") == 0 ||
388 matches(*argv, "list") == 0)
389 return ipaddr_list_link(argc-1, argv+1);
390 if (matches(*argv, "help") == 0)
393 return ipaddr_list_link(0, NULL);
395 fprintf(stderr, "Command \"%s\" is unknown, try \"ip link help\".\n", *argv);