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.
10 //#include <sys/ioctl.h>
11 //#include <sys/socket.h>
13 #include <net/if_packet.h>
14 #include <netpacket/packet.h>
15 #include <net/ethernet.h>
17 #include "ip_common.h" /* #include "libbb.h" is inside */
21 /* taken from linux/sockios.h */
22 #define SIOCSIFNAME 0x8923 /* set interface name */
24 static void on_off(const char *msg) ATTRIBUTE_NORETURN;
25 static void on_off(const char *msg)
27 bb_error_msg_and_die("error: argument of \"%s\" must be \"on\" or \"off\"", msg);
31 static int get_ctl_fd(void)
35 fd = socket(PF_INET, SOCK_DGRAM, 0);
38 fd = socket(PF_PACKET, SOCK_DGRAM, 0);
41 return xsocket(PF_INET6, SOCK_DGRAM, 0);
45 static void do_chflags(char *dev, uint32_t flags, uint32_t mask)
50 strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
52 if (ioctl(fd, SIOCGIFFLAGS, &ifr)) {
53 bb_perror_msg_and_die("SIOCGIFFLAGS");
55 if ((ifr.ifr_flags ^ flags) & mask) {
56 ifr.ifr_flags &= ~mask;
57 ifr.ifr_flags |= mask & flags;
58 if (ioctl(fd, SIOCSIFFLAGS, &ifr))
59 bb_perror_msg_and_die("SIOCSIFFLAGS");
65 static void do_changename(char *dev, char *newdev)
71 strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
72 strncpy(ifr.ifr_newname, newdev, sizeof(ifr.ifr_newname));
74 err = ioctl(fd, SIOCSIFNAME, &ifr);
76 bb_perror_msg_and_die("SIOCSIFNAME");
82 static void set_qlen(char *dev, int qlen)
88 memset(&ifr, 0, sizeof(ifr));
89 strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
91 if (ioctl(s, SIOCSIFTXQLEN, &ifr) < 0) {
92 bb_perror_msg_and_die("SIOCSIFXQLEN");
98 static void set_mtu(char *dev, int mtu)
104 memset(&ifr, 0, sizeof(ifr));
105 strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
107 if (ioctl(s, SIOCSIFMTU, &ifr) < 0) {
108 bb_perror_msg_and_die("SIOCSIFMTU");
114 static int get_address(char *dev, int *htype)
117 struct sockaddr_ll me;
121 s = xsocket(PF_PACKET, SOCK_DGRAM, 0);
123 memset(&ifr, 0, sizeof(ifr));
124 strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
125 if (ioctl(s, SIOCGIFINDEX, &ifr) < 0) {
126 bb_perror_msg_and_die("SIOCGIFINDEX");
129 memset(&me, 0, sizeof(me));
130 me.sll_family = AF_PACKET;
131 me.sll_ifindex = ifr.ifr_ifindex;
132 me.sll_protocol = htons(ETH_P_LOOP);
133 xbind(s, (struct sockaddr*)&me, sizeof(me));
136 if (getsockname(s, (struct sockaddr*)&me, &alen) == -1) {
137 bb_perror_msg_and_die("getsockname");
140 *htype = me.sll_hatype;
145 static void parse_address(char *dev, int hatype, int halen, char *lla, struct ifreq *ifr)
149 memset(ifr, 0, sizeof(*ifr));
150 strncpy(ifr->ifr_name, dev, sizeof(ifr->ifr_name));
151 ifr->ifr_hwaddr.sa_family = hatype;
152 alen = ll_addr_a2n((unsigned char *)(ifr->ifr_hwaddr.sa_data), 14, lla);
156 bb_error_msg_and_die("wrong address (%s) length: expected %d bytes", lla, halen);
161 static void set_address(struct ifreq *ifr, int brd)
166 if (ioctl(s, brd ? SIOCSIFHWBROADCAST :SIOCSIFHWADDR, ifr) < 0) {
167 bb_perror_msg_and_die(brd ? "SIOCSIFHWBROADCAST" : "SIOCSIFHWADDR");
173 /* Return value becomes exitcode. It's okay to not return at all */
174 static int do_set(int argc, char **argv)
181 char *newaddr = NULL;
183 struct ifreq ifr0, ifr1;
184 char *newname = NULL;
186 static const char * const keywords[] = {
187 "up", "down", "name", "mtu", "multicast", "arp", "addr", "dev",
190 enum { ARG_up = 1, ARG_down, ARG_name, ARG_mtu, ARG_multicast, ARG_arp,
191 ARG_addr, ARG_dev, PARM_on, PARM_off };
195 key = index_in_str_array(keywords, *argv) + 1;
199 } else if (key == ARG_down) {
202 } else if (key == ARG_name) {
205 } else if (key == ARG_mtu) {
208 duparg("mtu", *argv);
209 if (get_integer(&mtu, *argv, 0))
210 invarg(*argv, "mtu");
211 } else if (key == ARG_multicast) {
213 mask |= IFF_MULTICAST;
214 key = index_in_str_array(keywords, *argv) + 1;
215 if (key == PARM_on) {
216 flags |= IFF_MULTICAST;
217 } else if (key == PARM_off) {
218 flags &= ~IFF_MULTICAST;
221 } else if (key == ARG_arp) {
224 key = index_in_str_array(keywords, *argv) + 1;
225 if (key == PARM_on) {
227 } else if (key == PARM_off) {
231 } else if (key == ARG_addr) {
235 if (key == ARG_dev) {
239 duparg2("dev", *argv);
246 bb_error_msg_and_die(bb_msg_requires_arg, "\"dev\"");
249 if (newaddr || newbrd) {
250 halen = get_address(dev, &htype);
252 parse_address(dev, htype, halen, newaddr, &ifr0);
255 parse_address(dev, htype, halen, newbrd, &ifr1);
259 if (newname && strcmp(dev, newname)) {
260 do_changename(dev, newname);
269 if (newaddr || newbrd) {
271 set_address(&ifr1, 1);
274 set_address(&ifr0, 0);
278 do_chflags(dev, flags, mask);
282 static int ipaddr_list_link(int argc, char **argv)
284 preferred_family = AF_PACKET;
285 return ipaddr_list_or_flush(argc, argv, 0);
288 /* Return value becomes exitcode. It's okay to not return at all */
289 int do_iplink(int argc, char **argv)
291 static const char * const keywords[] = {
292 "set", "show", "lst", "list", NULL
296 return ipaddr_list_link(0, NULL);
297 key = index_in_substr_array(keywords, *argv) + 1;
299 bb_error_msg_and_die(bb_msg_invalid_arg, *argv, applet_name);
301 if (key == 1) /* set */
302 return do_set(argc, argv);
303 else /* show, lst, list */
304 return ipaddr_list_link(argc, argv);