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 <net/if_packet.h>
23 #include <netpacket/packet.h>
25 #if __GLIBC__ >=2 && __GLIBC_MINOR >= 1
26 #include <net/ethernet.h>
28 #include <linux/if_ether.h>
33 #include "ip_common.h"
38 /* take from linux/sockios.h */
39 #define SIOCSIFNAME 0x8923 /* set interface name */
43 static int on_off(char *msg)
45 error_msg("Error: argument of \"%s\" must be \"on\" or \"off\"", msg);
49 static int get_ctl_fd(void)
54 fd = socket(PF_INET, SOCK_DGRAM, 0);
58 fd = socket(PF_PACKET, SOCK_DGRAM, 0);
61 fd = socket(PF_INET6, SOCK_DGRAM, 0);
65 perror("Cannot create control socket");
69 static int do_chflags(char *dev, __u32 flags, __u32 mask)
75 strcpy(ifr.ifr_name, dev);
79 err = ioctl(fd, SIOCGIFFLAGS, &ifr);
81 perror("SIOCGIFFLAGS");
85 if ((ifr.ifr_flags^flags)&mask) {
86 ifr.ifr_flags &= ~mask;
87 ifr.ifr_flags |= mask&flags;
88 err = ioctl(fd, SIOCSIFFLAGS, &ifr);
90 perror("SIOCSIFFLAGS");
96 static int do_changename(char *dev, char *newdev)
102 strcpy(ifr.ifr_name, dev);
103 strcpy(ifr.ifr_newname, newdev);
107 err = ioctl(fd, SIOCSIFNAME, &ifr);
109 perror("SIOCSIFNAME");
117 static int set_qlen(char *dev, int qlen)
126 memset(&ifr, 0, sizeof(ifr));
127 strcpy(ifr.ifr_name, dev);
129 if (ioctl(s, SIOCSIFTXQLEN, &ifr) < 0) {
130 perror("SIOCSIFXQLEN");
139 static int set_mtu(char *dev, int mtu)
148 memset(&ifr, 0, sizeof(ifr));
149 strcpy(ifr.ifr_name, dev);
151 if (ioctl(s, SIOCSIFMTU, &ifr) < 0) {
152 perror("SIOCSIFMTU");
161 static int get_address(char *dev, int *htype)
164 struct sockaddr_ll me;
168 s = socket(PF_PACKET, SOCK_DGRAM, 0);
170 perror("socket(PF_PACKET)");
174 memset(&ifr, 0, sizeof(ifr));
175 strcpy(ifr.ifr_name, dev);
176 if (ioctl(s, SIOCGIFINDEX, &ifr) < 0) {
177 perror("SIOCGIFINDEX");
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) {
193 if (getsockname(s, (struct sockaddr*)&me, &alen) == -1) {
194 perror("getsockname");
199 *htype = me.sll_hatype;
203 static int parse_address(char *dev, int hatype, int halen, char *lla, struct ifreq *ifr)
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);
214 error_msg("Wrong address (%s) length: expected %d bytes", lla, halen);
220 static int set_address(struct ifreq *ifr, int brd)
227 if (ioctl(s, brd?SIOCSIFHWBROADCAST:SIOCSIFHWADDR, ifr) < 0) {
228 perror(brd?"SIOCSIFHWBROADCAST":"SIOCSIFHWADDR");
237 static int do_set(int argc, char **argv)
244 char *newaddr = NULL;
246 struct ifreq ifr0, ifr1;
247 char *newname = NULL;
251 if (strcmp(*argv, "up") == 0) {
254 } else if (strcmp(*argv, "down") == 0) {
257 } else if (strcmp(*argv, "name") == 0) {
260 } else if (strcmp(*argv, "mtu") == 0) {
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) {
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;
274 return on_off("multicast");
275 } else if (strcmp(*argv, "arp") == 0) {
278 if (strcmp(*argv, "on") == 0) {
280 } else if (strcmp(*argv, "off") == 0) {
283 return on_off("noarp");
285 if (strcmp(*argv, "dev") == 0) {
289 duparg2("dev", *argv);
296 error_msg("Not enough of information: \"dev\" argument is required.");
300 if (newaddr || newbrd) {
301 halen = get_address(dev, &htype);
305 if (parse_address(dev, htype, halen, newaddr, &ifr0) < 0)
309 if (parse_address(dev, htype, halen, newbrd, &ifr1) < 0)
314 if (newname && strcmp(dev, newname)) {
315 if (do_changename(dev, newname) < 0)
320 if (set_qlen(dev, qlen) < 0)
324 if (set_mtu(dev, mtu) < 0)
327 if (newaddr || newbrd) {
329 if (set_address(&ifr1, 1) < 0)
333 if (set_address(&ifr0, 0) < 0)
338 return do_chflags(dev, flags, mask);
342 static int ipaddr_list_link(int argc, char **argv)
344 preferred_family = AF_PACKET;
346 return ipaddr_list_or_flush(argc, argv, 0);
349 int do_iplink(int argc, char **argv)
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);
359 return ipaddr_list_link(0, NULL);
361 error_msg("Command \"%s\" is unknown, try \"ip link help\".", *argv);