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 /* taken from linux/sockios.h */
26 #define SIOCSIFNAME 0x8923 /* set interface name */
28 static void on_off(const char *msg) ATTRIBUTE_NORETURN;
29 static void on_off(const char *msg)
31 bb_error_msg_and_die("error: argument of \"%s\" must be \"on\" or \"off\"", msg);
35 static int get_ctl_fd(void)
39 fd = socket(PF_INET, SOCK_DGRAM, 0);
42 fd = socket(PF_PACKET, SOCK_DGRAM, 0);
45 return xsocket(PF_INET6, SOCK_DGRAM, 0);
49 static void do_chflags(char *dev, uint32_t flags, uint32_t mask)
54 strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
56 if (ioctl(fd, SIOCGIFFLAGS, &ifr)) {
57 bb_perror_msg_and_die("SIOCGIFFLAGS");
59 if ((ifr.ifr_flags ^ flags) & mask) {
60 ifr.ifr_flags &= ~mask;
61 ifr.ifr_flags |= mask & flags;
62 if (ioctl(fd, SIOCSIFFLAGS, &ifr))
63 bb_perror_msg_and_die("SIOCSIFFLAGS");
69 static void do_changename(char *dev, char *newdev)
75 strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
76 strncpy(ifr.ifr_newname, newdev, sizeof(ifr.ifr_newname));
78 err = ioctl(fd, SIOCSIFNAME, &ifr);
80 bb_perror_msg_and_die("SIOCSIFNAME");
86 static void set_qlen(char *dev, int qlen)
92 memset(&ifr, 0, sizeof(ifr));
93 strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
95 if (ioctl(s, SIOCSIFTXQLEN, &ifr) < 0) {
96 bb_perror_msg_and_die("SIOCSIFXQLEN");
102 static void set_mtu(char *dev, int mtu)
108 memset(&ifr, 0, sizeof(ifr));
109 strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
111 if (ioctl(s, SIOCSIFMTU, &ifr) < 0) {
112 bb_perror_msg_and_die("SIOCSIFMTU");
118 static int get_address(char *dev, int *htype)
121 struct sockaddr_ll me;
125 s = xsocket(PF_PACKET, SOCK_DGRAM, 0);
127 memset(&ifr, 0, sizeof(ifr));
128 strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
129 if (ioctl(s, SIOCGIFINDEX, &ifr) < 0) {
130 bb_perror_msg_and_die("SIOCGIFINDEX");
133 memset(&me, 0, sizeof(me));
134 me.sll_family = AF_PACKET;
135 me.sll_ifindex = ifr.ifr_ifindex;
136 me.sll_protocol = htons(ETH_P_LOOP);
137 xbind(s, (struct sockaddr*)&me, sizeof(me));
140 if (getsockname(s, (struct sockaddr*)&me, &alen) == -1) {
141 bb_perror_msg_and_die("getsockname");
144 *htype = me.sll_hatype;
149 static void parse_address(char *dev, int hatype, int halen, char *lla, struct ifreq *ifr)
153 memset(ifr, 0, sizeof(*ifr));
154 strncpy(ifr->ifr_name, dev, sizeof(ifr->ifr_name));
155 ifr->ifr_hwaddr.sa_family = hatype;
156 alen = ll_addr_a2n((unsigned char *)(ifr->ifr_hwaddr.sa_data), 14, lla);
160 bb_error_msg_and_die("wrong address (%s) length: expected %d bytes", lla, halen);
165 static void set_address(struct ifreq *ifr, int brd)
170 if (ioctl(s, brd ? SIOCSIFHWBROADCAST :SIOCSIFHWADDR, ifr) < 0) {
171 bb_perror_msg_and_die(brd ? "SIOCSIFHWBROADCAST" : "SIOCSIFHWADDR");
177 /* Return value becomes exitcode. It's okay to not return at all */
178 static int do_set(int argc, char **argv)
185 char *newaddr = NULL;
187 struct ifreq ifr0, ifr1;
188 char *newname = NULL;
190 static const char * const keywords[] = {
191 "up", "down", "name", "mtu", "multicast", "arp", "addr", "dev",
194 enum { ARG_up = 1, ARG_down, ARG_name, ARG_mtu, ARG_multicast, ARG_arp,
195 ARG_addr, ARG_dev, PARM_on, PARM_off };
199 key = index_in_str_array(keywords, *argv) + 1;
203 } else if (key == ARG_down) {
206 } else if (key == ARG_name) {
209 } else if (key == ARG_mtu) {
212 duparg("mtu", *argv);
213 if (get_integer(&mtu, *argv, 0))
214 invarg(*argv, "mtu");
215 } else if (key == ARG_multicast) {
217 mask |= IFF_MULTICAST;
218 key = index_in_str_array(keywords, *argv) + 1;
219 if (key == PARM_on) {
220 flags |= IFF_MULTICAST;
221 } else if (key == PARM_off) {
222 flags &= ~IFF_MULTICAST;
225 } else if (key == ARG_arp) {
228 key = index_in_str_array(keywords, *argv) + 1;
229 if (key == PARM_on) {
231 } else if (key == PARM_off) {
235 } else if (key == ARG_addr) {
239 if (key == ARG_dev) {
243 duparg2("dev", *argv);
250 bb_error_msg_and_die(bb_msg_requires_arg, "\"dev\"");
253 if (newaddr || newbrd) {
254 halen = get_address(dev, &htype);
256 parse_address(dev, htype, halen, newaddr, &ifr0);
259 parse_address(dev, htype, halen, newbrd, &ifr1);
263 if (newname && strcmp(dev, newname)) {
264 do_changename(dev, newname);
273 if (newaddr || newbrd) {
275 set_address(&ifr1, 1);
278 set_address(&ifr0, 0);
282 do_chflags(dev, flags, mask);
286 static int ipaddr_list_link(int argc, char **argv)
288 preferred_family = AF_PACKET;
289 return ipaddr_list_or_flush(argc, argv, 0);
292 /* Return value becomes exitcode. It's okay to not return at all */
293 int do_iplink(int argc, char **argv)
295 static const char * const keywords[] = {
296 "set", "show", "lst", "list", NULL
300 return ipaddr_list_link(0, NULL);
301 key = index_in_substr_array(keywords, *argv) + 1;
303 bb_error_msg_and_die(bb_msg_invalid_arg, *argv, applet_name);
305 if (key == 1) /* set */
306 return do_set(argc, argv);
307 else /* show, lst, list */
308 return ipaddr_list_link(argc, argv);