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>
13 #include <sys/ioctl.h>
14 #include <sys/socket.h>
22 #include <linux/if_packet.h>
23 #include <linux/if_ether.h>
24 #include <linux/sockios.h>
28 #include "ip_common.h"
34 static int on_off(char *msg)
36 error_msg("Error: argument of \"%s\" must be \"on\" or \"off\"", msg);
40 static int get_ctl_fd(void)
45 fd = socket(PF_INET, SOCK_DGRAM, 0);
49 fd = socket(PF_PACKET, SOCK_DGRAM, 0);
52 fd = socket(PF_INET6, SOCK_DGRAM, 0);
56 perror("Cannot create control socket");
60 static int do_chflags(char *dev, __u32 flags, __u32 mask)
66 strcpy(ifr.ifr_name, dev);
70 err = ioctl(fd, SIOCGIFFLAGS, &ifr);
72 perror("SIOCGIFFLAGS");
76 if ((ifr.ifr_flags^flags)&mask) {
77 ifr.ifr_flags &= ~mask;
78 ifr.ifr_flags |= mask&flags;
79 err = ioctl(fd, SIOCSIFFLAGS, &ifr);
81 perror("SIOCSIFFLAGS");
87 static int do_changename(char *dev, char *newdev)
93 strcpy(ifr.ifr_name, dev);
94 strcpy(ifr.ifr_newname, newdev);
98 err = ioctl(fd, SIOCSIFNAME, &ifr);
100 perror("SIOCSIFNAME");
108 static int set_qlen(char *dev, int qlen)
117 memset(&ifr, 0, sizeof(ifr));
118 strcpy(ifr.ifr_name, dev);
120 if (ioctl(s, SIOCSIFTXQLEN, &ifr) < 0) {
121 perror("SIOCSIFXQLEN");
130 static int set_mtu(char *dev, int mtu)
139 memset(&ifr, 0, sizeof(ifr));
140 strcpy(ifr.ifr_name, dev);
142 if (ioctl(s, SIOCSIFMTU, &ifr) < 0) {
143 perror("SIOCSIFMTU");
152 static int get_address(char *dev, int *htype)
155 struct sockaddr_ll me;
159 s = socket(PF_PACKET, SOCK_DGRAM, 0);
161 perror("socket(PF_PACKET)");
165 memset(&ifr, 0, sizeof(ifr));
166 strcpy(ifr.ifr_name, dev);
167 if (ioctl(s, SIOCGIFINDEX, &ifr) < 0) {
168 perror("SIOCGIFINDEX");
173 memset(&me, 0, sizeof(me));
174 me.sll_family = AF_PACKET;
175 me.sll_ifindex = ifr.ifr_ifindex;
176 me.sll_protocol = htons(ETH_P_LOOP);
177 if (bind(s, (struct sockaddr*)&me, sizeof(me)) == -1) {
184 if (getsockname(s, (struct sockaddr*)&me, &alen) == -1) {
185 perror("getsockname");
190 *htype = me.sll_hatype;
194 static int parse_address(char *dev, int hatype, int halen, char *lla, struct ifreq *ifr)
198 memset(ifr, 0, sizeof(*ifr));
199 strcpy(ifr->ifr_name, dev);
200 ifr->ifr_hwaddr.sa_family = hatype;
201 alen = ll_addr_a2n(ifr->ifr_hwaddr.sa_data, 14, lla);
205 error_msg("Wrong address (%s) length: expected %d bytes", lla, halen);
211 static int set_address(struct ifreq *ifr, int brd)
218 if (ioctl(s, brd?SIOCSIFHWBROADCAST:SIOCSIFHWADDR, ifr) < 0) {
219 perror(brd?"SIOCSIFHWBROADCAST":"SIOCSIFHWADDR");
228 static int do_set(int argc, char **argv)
235 char *newaddr = NULL;
237 struct ifreq ifr0, ifr1;
238 char *newname = NULL;
242 if (strcmp(*argv, "up") == 0) {
245 } else if (strcmp(*argv, "down") == 0) {
248 } else if (strcmp(*argv, "name") == 0) {
251 } else if (strcmp(*argv, "mtu") == 0) {
254 duparg("mtu", *argv);
255 if (get_integer(&mtu, *argv, 0))
256 invarg("Invalid \"mtu\" value\n", *argv);
257 } else if (strcmp(*argv, "multicast") == 0) {
259 mask |= IFF_MULTICAST;
260 if (strcmp(*argv, "on") == 0) {
261 flags |= IFF_MULTICAST;
262 } else if (strcmp(*argv, "off") == 0) {
263 flags &= ~IFF_MULTICAST;
265 return on_off("multicast");
266 } else if (strcmp(*argv, "arp") == 0) {
269 if (strcmp(*argv, "on") == 0) {
271 } else if (strcmp(*argv, "off") == 0) {
274 return on_off("noarp");
276 if (strcmp(*argv, "dev") == 0) {
280 duparg2("dev", *argv);
287 error_msg("Not enough of information: \"dev\" argument is required.");
291 if (newaddr || newbrd) {
292 halen = get_address(dev, &htype);
296 if (parse_address(dev, htype, halen, newaddr, &ifr0) < 0)
300 if (parse_address(dev, htype, halen, newbrd, &ifr1) < 0)
305 if (newname && strcmp(dev, newname)) {
306 if (do_changename(dev, newname) < 0)
311 if (set_qlen(dev, qlen) < 0)
315 if (set_mtu(dev, mtu) < 0)
318 if (newaddr || newbrd) {
320 if (set_address(&ifr1, 1) < 0)
324 if (set_address(&ifr0, 0) < 0)
329 return do_chflags(dev, flags, mask);
333 static int ipaddr_list_link(int argc, char **argv)
335 preferred_family = AF_PACKET;
337 return ipaddr_list_or_flush(argc, argv, 0);
340 int do_iplink(int argc, char **argv)
343 if (matches(*argv, "set") == 0)
344 return do_set(argc-1, argv+1);
345 if (matches(*argv, "show") == 0 ||
346 matches(*argv, "lst") == 0 ||
347 matches(*argv, "list") == 0)
348 return ipaddr_list_link(argc-1, argv+1);
350 return ipaddr_list_link(0, NULL);
352 error_msg("Command \"%s\" is unknown, try \"ip link help\".", *argv);