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"
38 static int on_off(char *msg)
40 error_msg("Error: argument of \"%s\" must be \"on\" or \"off\"", msg);
44 static int get_ctl_fd(void)
49 fd = socket(PF_INET, SOCK_DGRAM, 0);
53 fd = socket(PF_PACKET, SOCK_DGRAM, 0);
56 fd = socket(PF_INET6, SOCK_DGRAM, 0);
60 perror("Cannot create control socket");
64 static int do_chflags(char *dev, __u32 flags, __u32 mask)
70 strcpy(ifr.ifr_name, dev);
74 err = ioctl(fd, SIOCGIFFLAGS, &ifr);
76 perror("SIOCGIFFLAGS");
80 if ((ifr.ifr_flags^flags)&mask) {
81 ifr.ifr_flags &= ~mask;
82 ifr.ifr_flags |= mask&flags;
83 err = ioctl(fd, SIOCSIFFLAGS, &ifr);
85 perror("SIOCSIFFLAGS");
91 static int do_changename(char *dev, char *newdev)
97 strcpy(ifr.ifr_name, dev);
98 strcpy(ifr.ifr_newname, newdev);
102 err = ioctl(fd, SIOCSIFNAME, &ifr);
104 perror("SIOCSIFNAME");
112 static int set_qlen(char *dev, int qlen)
121 memset(&ifr, 0, sizeof(ifr));
122 strcpy(ifr.ifr_name, dev);
124 if (ioctl(s, SIOCSIFTXQLEN, &ifr) < 0) {
125 perror("SIOCSIFXQLEN");
134 static int set_mtu(char *dev, int mtu)
143 memset(&ifr, 0, sizeof(ifr));
144 strcpy(ifr.ifr_name, dev);
146 if (ioctl(s, SIOCSIFMTU, &ifr) < 0) {
147 perror("SIOCSIFMTU");
156 static int get_address(char *dev, int *htype)
159 struct sockaddr_ll me;
163 s = socket(PF_PACKET, SOCK_DGRAM, 0);
165 perror("socket(PF_PACKET)");
169 memset(&ifr, 0, sizeof(ifr));
170 strcpy(ifr.ifr_name, dev);
171 if (ioctl(s, SIOCGIFINDEX, &ifr) < 0) {
172 perror("SIOCGIFINDEX");
177 memset(&me, 0, sizeof(me));
178 me.sll_family = AF_PACKET;
179 me.sll_ifindex = ifr.ifr_ifindex;
180 me.sll_protocol = htons(ETH_P_LOOP);
181 if (bind(s, (struct sockaddr*)&me, sizeof(me)) == -1) {
188 if (getsockname(s, (struct sockaddr*)&me, &alen) == -1) {
189 perror("getsockname");
194 *htype = me.sll_hatype;
198 static int parse_address(char *dev, int hatype, int halen, char *lla, struct ifreq *ifr)
202 memset(ifr, 0, sizeof(*ifr));
203 strcpy(ifr->ifr_name, dev);
204 ifr->ifr_hwaddr.sa_family = hatype;
205 alen = ll_addr_a2n(ifr->ifr_hwaddr.sa_data, 14, lla);
209 error_msg("Wrong address (%s) length: expected %d bytes", lla, halen);
215 static int set_address(struct ifreq *ifr, int brd)
222 if (ioctl(s, brd?SIOCSIFHWBROADCAST:SIOCSIFHWADDR, ifr) < 0) {
223 perror(brd?"SIOCSIFHWBROADCAST":"SIOCSIFHWADDR");
232 static int do_set(int argc, char **argv)
239 char *newaddr = NULL;
241 struct ifreq ifr0, ifr1;
242 char *newname = NULL;
246 if (strcmp(*argv, "up") == 0) {
249 } else if (strcmp(*argv, "down") == 0) {
252 } else if (strcmp(*argv, "name") == 0) {
255 } else if (strcmp(*argv, "mtu") == 0) {
258 duparg("mtu", *argv);
259 if (get_integer(&mtu, *argv, 0))
260 invarg("Invalid \"mtu\" value\n", *argv);
261 } else if (strcmp(*argv, "multicast") == 0) {
263 mask |= IFF_MULTICAST;
264 if (strcmp(*argv, "on") == 0) {
265 flags |= IFF_MULTICAST;
266 } else if (strcmp(*argv, "off") == 0) {
267 flags &= ~IFF_MULTICAST;
269 return on_off("multicast");
270 } else if (strcmp(*argv, "arp") == 0) {
273 if (strcmp(*argv, "on") == 0) {
275 } else if (strcmp(*argv, "off") == 0) {
278 return on_off("noarp");
280 if (strcmp(*argv, "dev") == 0) {
284 duparg2("dev", *argv);
291 error_msg("Not enough of information: \"dev\" argument is required.");
295 if (newaddr || newbrd) {
296 halen = get_address(dev, &htype);
300 if (parse_address(dev, htype, halen, newaddr, &ifr0) < 0)
304 if (parse_address(dev, htype, halen, newbrd, &ifr1) < 0)
309 if (newname && strcmp(dev, newname)) {
310 if (do_changename(dev, newname) < 0)
315 if (set_qlen(dev, qlen) < 0)
319 if (set_mtu(dev, mtu) < 0)
322 if (newaddr || newbrd) {
324 if (set_address(&ifr1, 1) < 0)
328 if (set_address(&ifr0, 0) < 0)
333 return do_chflags(dev, flags, mask);
337 static int ipaddr_list_link(int argc, char **argv)
339 preferred_family = AF_PACKET;
341 return ipaddr_list(argc, argv);
344 int do_iplink(int argc, char **argv)
347 if (matches(*argv, "set") == 0)
348 return do_set(argc-1, argv+1);
349 if (matches(*argv, "show") == 0 ||
350 matches(*argv, "lst") == 0 ||
351 matches(*argv, "list") == 0)
352 return ipaddr_list_link(argc-1, argv+1);
354 return ipaddr_list_link(0, NULL);
356 error_msg("Command \"%s\" is unknown, try \"ip link help\".", *argv);