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>
15 #include <linux/version.h>
23 #include <net/if_packet.h>
24 #include <netpacket/packet.h>
26 #if __GLIBC__ >=2 && __GLIBC_MINOR >= 1
27 #include <net/ethernet.h>
29 #include <linux/if_ether.h>
34 #include "ip_common.h"
39 /* take from linux/sockios.h */
40 #define SIOCSIFNAME 0x8923 /* set interface name */
44 static int on_off(char *msg)
46 bb_error_msg("Error: argument of \"%s\" must be \"on\" or \"off\"", msg);
50 static int get_ctl_fd(void)
55 fd = socket(PF_INET, SOCK_DGRAM, 0);
59 fd = socket(PF_PACKET, SOCK_DGRAM, 0);
62 fd = socket(PF_INET6, SOCK_DGRAM, 0);
66 perror("Cannot create control socket");
70 static int do_chflags(char *dev, __u32 flags, __u32 mask)
76 strcpy(ifr.ifr_name, dev);
80 err = ioctl(fd, SIOCGIFFLAGS, &ifr);
82 perror("SIOCGIFFLAGS");
86 if ((ifr.ifr_flags^flags)&mask) {
87 ifr.ifr_flags &= ~mask;
88 ifr.ifr_flags |= mask&flags;
89 err = ioctl(fd, SIOCSIFFLAGS, &ifr);
91 perror("SIOCSIFFLAGS");
97 static int do_changename(char *dev, char *newdev)
99 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 4, 0)
104 strcpy(ifr.ifr_name, dev);
105 strcpy(ifr.ifr_newname, newdev);
109 err = ioctl(fd, SIOCSIFNAME, &ifr);
111 perror("SIOCSIFNAME");
121 static int set_qlen(char *dev, int qlen)
130 memset(&ifr, 0, sizeof(ifr));
131 strcpy(ifr.ifr_name, dev);
133 if (ioctl(s, SIOCSIFTXQLEN, &ifr) < 0) {
134 perror("SIOCSIFXQLEN");
143 static int set_mtu(char *dev, int mtu)
152 memset(&ifr, 0, sizeof(ifr));
153 strcpy(ifr.ifr_name, dev);
155 if (ioctl(s, SIOCSIFMTU, &ifr) < 0) {
156 perror("SIOCSIFMTU");
165 static int get_address(char *dev, int *htype)
168 struct sockaddr_ll me;
172 s = socket(PF_PACKET, SOCK_DGRAM, 0);
174 perror("socket(PF_PACKET)");
178 memset(&ifr, 0, sizeof(ifr));
179 strcpy(ifr.ifr_name, dev);
180 if (ioctl(s, SIOCGIFINDEX, &ifr) < 0) {
181 perror("SIOCGIFINDEX");
186 memset(&me, 0, sizeof(me));
187 me.sll_family = AF_PACKET;
188 me.sll_ifindex = ifr.ifr_ifindex;
189 me.sll_protocol = htons(ETH_P_LOOP);
190 if (bind(s, (struct sockaddr*)&me, sizeof(me)) == -1) {
197 if (getsockname(s, (struct sockaddr*)&me, &alen) == -1) {
198 perror("getsockname");
203 *htype = me.sll_hatype;
207 static int parse_address(char *dev, int hatype, int halen, char *lla, struct ifreq *ifr)
211 memset(ifr, 0, sizeof(*ifr));
212 strcpy(ifr->ifr_name, dev);
213 ifr->ifr_hwaddr.sa_family = hatype;
214 alen = ll_addr_a2n(ifr->ifr_hwaddr.sa_data, 14, lla);
218 bb_error_msg("Wrong address (%s) length: expected %d bytes", lla, halen);
224 static int set_address(struct ifreq *ifr, int brd)
231 if (ioctl(s, brd?SIOCSIFHWBROADCAST:SIOCSIFHWADDR, ifr) < 0) {
232 perror(brd?"SIOCSIFHWBROADCAST":"SIOCSIFHWADDR");
241 static int do_set(int argc, char **argv)
248 char *newaddr = NULL;
250 struct ifreq ifr0, ifr1;
251 char *newname = NULL;
255 if (strcmp(*argv, "up") == 0) {
258 } else if (strcmp(*argv, "down") == 0) {
261 } else if (strcmp(*argv, "name") == 0) {
264 } else if (strcmp(*argv, "mtu") == 0) {
267 duparg("mtu", *argv);
268 if (get_integer(&mtu, *argv, 0))
269 invarg("Invalid \"mtu\" value\n", *argv);
270 } else if (strcmp(*argv, "multicast") == 0) {
272 mask |= IFF_MULTICAST;
273 if (strcmp(*argv, "on") == 0) {
274 flags |= IFF_MULTICAST;
275 } else if (strcmp(*argv, "off") == 0) {
276 flags &= ~IFF_MULTICAST;
278 return on_off("multicast");
279 } else if (strcmp(*argv, "arp") == 0) {
282 if (strcmp(*argv, "on") == 0) {
284 } else if (strcmp(*argv, "off") == 0) {
287 return on_off("noarp");
289 if (strcmp(*argv, "dev") == 0) {
293 duparg2("dev", *argv);
300 bb_error_msg("Not enough of information: \"dev\" argument is required.");
304 if (newaddr || newbrd) {
305 halen = get_address(dev, &htype);
309 if (parse_address(dev, htype, halen, newaddr, &ifr0) < 0)
313 if (parse_address(dev, htype, halen, newbrd, &ifr1) < 0)
318 if (newname && strcmp(dev, newname)) {
319 if (do_changename(dev, newname) < 0)
324 if (set_qlen(dev, qlen) < 0)
328 if (set_mtu(dev, mtu) < 0)
331 if (newaddr || newbrd) {
333 if (set_address(&ifr1, 1) < 0)
337 if (set_address(&ifr0, 0) < 0)
342 return do_chflags(dev, flags, mask);
346 static int ipaddr_list_link(int argc, char **argv)
348 preferred_family = AF_PACKET;
350 return ipaddr_list_or_flush(argc, argv, 0);
353 int do_iplink(int argc, char **argv)
356 if (matches(*argv, "set") == 0)
357 return do_set(argc-1, argv+1);
358 if (matches(*argv, "show") == 0 ||
359 matches(*argv, "lst") == 0 ||
360 matches(*argv, "list") == 0)
361 return ipaddr_list_link(argc-1, argv+1);
363 return ipaddr_list_link(0, NULL);
365 bb_error_msg("Command \"%s\" is unknown, try \"ip link help\".", *argv);