1 /* vi: set sw=4 ts=4: */
5 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
7 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
12 #include <sys/ioctl.h>
13 #include <sys/socket.h>
16 #include <net/if_packet.h>
17 #include <netpacket/packet.h>
19 #include <net/ethernet.h>
23 #include "ip_common.h"
25 /* take from linux/sockios.h */
26 #define SIOCSIFNAME 0x8923 /* set interface name */
28 static int on_off(const char *msg)
30 bb_error_msg("error: argument of \"%s\" must be \"on\" or \"off\"", msg);
34 static int get_ctl_fd(void)
39 fd = socket(PF_INET, SOCK_DGRAM, 0);
43 fd = socket(PF_PACKET, SOCK_DGRAM, 0);
46 fd = socket(PF_INET6, SOCK_DGRAM, 0);
50 bb_perror_msg("cannot create control socket");
54 static int do_chflags(char *dev, uint32_t flags, uint32_t mask)
60 strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
64 err = ioctl(fd, SIOCGIFFLAGS, &ifr);
66 bb_perror_msg("SIOCGIFFLAGS");
70 if ((ifr.ifr_flags^flags)&mask) {
71 ifr.ifr_flags &= ~mask;
72 ifr.ifr_flags |= mask&flags;
73 err = ioctl(fd, SIOCSIFFLAGS, &ifr);
75 bb_perror_msg("SIOCSIFFLAGS");
81 static int do_changename(char *dev, char *newdev)
87 strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
88 strncpy(ifr.ifr_newname, newdev, sizeof(ifr.ifr_newname));
92 err = ioctl(fd, SIOCSIFNAME, &ifr);
94 bb_perror_msg("SIOCSIFNAME");
102 static int set_qlen(char *dev, int qlen)
111 memset(&ifr, 0, sizeof(ifr));
112 strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
114 if (ioctl(s, SIOCSIFTXQLEN, &ifr) < 0) {
115 bb_perror_msg("SIOCSIFXQLEN");
124 static int set_mtu(char *dev, int mtu)
133 memset(&ifr, 0, sizeof(ifr));
134 strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
136 if (ioctl(s, SIOCSIFMTU, &ifr) < 0) {
137 bb_perror_msg("SIOCSIFMTU");
146 static int get_address(char *dev, int *htype)
149 struct sockaddr_ll me;
153 s = socket(PF_PACKET, SOCK_DGRAM, 0);
155 bb_perror_msg("socket(PF_PACKET)");
159 memset(&ifr, 0, sizeof(ifr));
160 strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
161 if (ioctl(s, SIOCGIFINDEX, &ifr) < 0) {
162 bb_perror_msg("SIOCGIFINDEX");
167 memset(&me, 0, sizeof(me));
168 me.sll_family = AF_PACKET;
169 me.sll_ifindex = ifr.ifr_ifindex;
170 me.sll_protocol = htons(ETH_P_LOOP);
171 if (bind(s, (struct sockaddr*)&me, sizeof(me)) == -1) {
172 bb_perror_msg("bind");
178 if (getsockname(s, (struct sockaddr*)&me, &alen) == -1) {
179 bb_perror_msg("getsockname");
184 *htype = me.sll_hatype;
188 static int parse_address(char *dev, int hatype, int halen, char *lla, struct ifreq *ifr)
192 memset(ifr, 0, sizeof(*ifr));
193 strncpy(ifr->ifr_name, dev, sizeof(ifr->ifr_name));
194 ifr->ifr_hwaddr.sa_family = hatype;
195 alen = ll_addr_a2n((unsigned char *)(ifr->ifr_hwaddr.sa_data), 14, lla);
199 bb_error_msg("wrong address (%s) length: expected %d bytes", lla, halen);
205 static int set_address(struct ifreq *ifr, int brd)
212 if (ioctl(s, brd?SIOCSIFHWBROADCAST:SIOCSIFHWADDR, ifr) < 0) {
213 bb_perror_msg(brd ? "SIOCSIFHWBROADCAST" : "SIOCSIFHWADDR");
222 static int do_set(int argc, char **argv)
229 char *newaddr = NULL;
231 struct ifreq ifr0, ifr1;
232 char *newname = NULL;
236 if (strcmp(*argv, "up") == 0) {
239 } else if (strcmp(*argv, "down") == 0) {
242 } else if (strcmp(*argv, "name") == 0) {
245 } else if (strcmp(*argv, "mtu") == 0) {
248 duparg("mtu", *argv);
249 if (get_integer(&mtu, *argv, 0))
250 invarg(*argv, "mtu");
251 } else if (strcmp(*argv, "multicast") == 0) {
253 mask |= IFF_MULTICAST;
254 if (strcmp(*argv, "on") == 0) {
255 flags |= IFF_MULTICAST;
256 } else if (strcmp(*argv, "off") == 0) {
257 flags &= ~IFF_MULTICAST;
259 return on_off("multicast");
260 } else if (strcmp(*argv, "arp") == 0) {
263 if (strcmp(*argv, "on") == 0) {
265 } else if (strcmp(*argv, "off") == 0) {
268 return on_off("noarp");
269 } else if (strcmp(*argv, "addr") == 0) {
273 if (strcmp(*argv, "dev") == 0) {
277 duparg2("dev", *argv);
284 bb_error_msg(bb_msg_requires_arg, "\"dev\"");
288 if (newaddr || newbrd) {
289 halen = get_address(dev, &htype);
293 if (parse_address(dev, htype, halen, newaddr, &ifr0) < 0)
297 if (parse_address(dev, htype, halen, newbrd, &ifr1) < 0)
302 if (newname && strcmp(dev, newname)) {
303 if (do_changename(dev, newname) < 0)
308 if (set_qlen(dev, qlen) < 0)
312 if (set_mtu(dev, mtu) < 0)
315 if (newaddr || newbrd) {
317 if (set_address(&ifr1, 1) < 0)
321 if (set_address(&ifr0, 0) < 0)
326 return do_chflags(dev, flags, mask);
330 static int ipaddr_list_link(int argc, char **argv)
332 preferred_family = AF_PACKET;
333 return ipaddr_list_or_flush(argc, argv, 0);
336 int do_iplink(int argc, char **argv)
339 if (matches(*argv, "set") == 0)
340 return do_set(argc-1, argv+1);
341 if (matches(*argv, "show") == 0 ||
342 matches(*argv, "lst") == 0 ||
343 matches(*argv, "list") == 0)
344 return ipaddr_list_link(argc-1, argv+1);
346 return ipaddr_list_link(0, NULL);
348 bb_error_msg("command \"%s\" is unknown", *argv);