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"
36 static int on_off(char *msg)
38 fprintf(stderr, "Error: argument of \"%s\" must be \"on\" or \"off\"\n", msg);
42 static int get_ctl_fd(void)
47 fd = socket(PF_INET, SOCK_DGRAM, 0);
51 fd = socket(PF_PACKET, SOCK_DGRAM, 0);
54 fd = socket(PF_INET6, SOCK_DGRAM, 0);
58 perror("Cannot create control socket");
62 static int do_chflags(char *dev, __u32 flags, __u32 mask)
68 strcpy(ifr.ifr_name, dev);
72 err = ioctl(fd, SIOCGIFFLAGS, &ifr);
74 perror("SIOCGIFFLAGS");
78 if ((ifr.ifr_flags^flags)&mask) {
79 ifr.ifr_flags &= ~mask;
80 ifr.ifr_flags |= mask&flags;
81 err = ioctl(fd, SIOCSIFFLAGS, &ifr);
83 perror("SIOCSIFFLAGS");
89 static int do_changename(char *dev, char *newdev)
95 strcpy(ifr.ifr_name, dev);
96 strcpy(ifr.ifr_newname, newdev);
100 err = ioctl(fd, SIOCSIFNAME, &ifr);
102 perror("SIOCSIFNAME");
110 static int set_qlen(char *dev, int qlen)
119 memset(&ifr, 0, sizeof(ifr));
120 strcpy(ifr.ifr_name, dev);
122 if (ioctl(s, SIOCSIFTXQLEN, &ifr) < 0) {
123 perror("SIOCSIFXQLEN");
132 static int set_mtu(char *dev, int mtu)
141 memset(&ifr, 0, sizeof(ifr));
142 strcpy(ifr.ifr_name, dev);
144 if (ioctl(s, SIOCSIFMTU, &ifr) < 0) {
145 perror("SIOCSIFMTU");
154 static int get_address(char *dev, int *htype)
157 struct sockaddr_ll me;
161 s = socket(PF_PACKET, SOCK_DGRAM, 0);
163 perror("socket(PF_PACKET)");
167 memset(&ifr, 0, sizeof(ifr));
168 strcpy(ifr.ifr_name, dev);
169 if (ioctl(s, SIOCGIFINDEX, &ifr) < 0) {
170 perror("SIOCGIFINDEX");
175 memset(&me, 0, sizeof(me));
176 me.sll_family = AF_PACKET;
177 me.sll_ifindex = ifr.ifr_ifindex;
178 me.sll_protocol = htons(ETH_P_LOOP);
179 if (bind(s, (struct sockaddr*)&me, sizeof(me)) == -1) {
186 if (getsockname(s, (struct sockaddr*)&me, &alen) == -1) {
187 perror("getsockname");
192 *htype = me.sll_hatype;
196 static int parse_address(char *dev, int hatype, int halen, char *lla, struct ifreq *ifr)
200 memset(ifr, 0, sizeof(*ifr));
201 strcpy(ifr->ifr_name, dev);
202 ifr->ifr_hwaddr.sa_family = hatype;
203 alen = ll_addr_a2n(ifr->ifr_hwaddr.sa_data, 14, lla);
207 fprintf(stderr, "Wrong address (%s) length: expected %d bytes\n", lla, halen);
213 static int set_address(struct ifreq *ifr, int brd)
220 if (ioctl(s, brd?SIOCSIFHWBROADCAST:SIOCSIFHWADDR, ifr) < 0) {
221 perror(brd?"SIOCSIFHWBROADCAST":"SIOCSIFHWADDR");
230 static int do_set(int argc, char **argv)
237 char *newaddr = NULL;
239 struct ifreq ifr0, ifr1;
240 char *newname = NULL;
244 if (strcmp(*argv, "up") == 0) {
247 } else if (strcmp(*argv, "down") == 0) {
250 } else if (strcmp(*argv, "name") == 0) {
253 } else if (strcmp(*argv, "mtu") == 0) {
256 duparg("mtu", *argv);
257 if (get_integer(&mtu, *argv, 0))
258 invarg("Invalid \"mtu\" value\n", *argv);
259 } else if (strcmp(*argv, "multicast") == 0) {
261 mask |= IFF_MULTICAST;
262 if (strcmp(*argv, "on") == 0) {
263 flags |= IFF_MULTICAST;
264 } else if (strcmp(*argv, "off") == 0) {
265 flags &= ~IFF_MULTICAST;
267 return on_off("multicast");
268 } else if (strcmp(*argv, "arp") == 0) {
271 if (strcmp(*argv, "on") == 0) {
273 } else if (strcmp(*argv, "off") == 0) {
276 return on_off("noarp");
278 if (strcmp(*argv, "dev") == 0) {
282 duparg2("dev", *argv);
289 fprintf(stderr, "Not enough of information: \"dev\" argument is required.\n");
293 if (newaddr || newbrd) {
294 halen = get_address(dev, &htype);
298 if (parse_address(dev, htype, halen, newaddr, &ifr0) < 0)
302 if (parse_address(dev, htype, halen, newbrd, &ifr1) < 0)
307 if (newname && strcmp(dev, newname)) {
308 if (do_changename(dev, newname) < 0)
313 if (set_qlen(dev, qlen) < 0)
317 if (set_mtu(dev, mtu) < 0)
320 if (newaddr || newbrd) {
322 if (set_address(&ifr1, 1) < 0)
326 if (set_address(&ifr0, 0) < 0)
331 return do_chflags(dev, flags, mask);
335 int do_iplink(int argc, char **argv)
338 if (matches(*argv, "set") == 0)
339 return do_set(argc-1, argv+1);
340 if (matches(*argv, "show") == 0 ||
341 matches(*argv, "lst") == 0 ||
342 matches(*argv, "list") == 0)
343 return ipaddr_list_link(argc-1, argv+1);
345 return ipaddr_list_link(0, NULL);
347 fprintf(stderr, "Command \"%s\" is unknown, try \"ip link help\".\n", *argv);