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 xioctl(fd, SIOCGIFFLAGS, &ifr);
53 if ((ifr.ifr_flags ^ flags) & mask) {
54 ifr.ifr_flags &= ~mask;
55 ifr.ifr_flags |= mask & flags;
56 xioctl(fd, SIOCSIFFLAGS, &ifr);
62 static void do_changename(char *dev, char *newdev)
67 strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
68 strncpy(ifr.ifr_newname, newdev, sizeof(ifr.ifr_newname));
70 xioctl(fd, SIOCSIFNAME, &ifr);
75 static void set_qlen(char *dev, int qlen)
81 memset(&ifr, 0, sizeof(ifr));
82 strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
84 xioctl(s, SIOCSIFTXQLEN, &ifr);
89 static void set_mtu(char *dev, int mtu)
95 memset(&ifr, 0, sizeof(ifr));
96 strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
98 xioctl(s, SIOCSIFMTU, &ifr);
103 static int get_address(char *dev, int *htype)
106 struct sockaddr_ll me;
110 s = xsocket(PF_PACKET, SOCK_DGRAM, 0);
112 memset(&ifr, 0, sizeof(ifr));
113 strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
114 xioctl(s, SIOCGIFINDEX, &ifr);
116 memset(&me, 0, sizeof(me));
117 me.sll_family = AF_PACKET;
118 me.sll_ifindex = ifr.ifr_ifindex;
119 me.sll_protocol = htons(ETH_P_LOOP);
120 xbind(s, (struct sockaddr*)&me, sizeof(me));
123 if (getsockname(s, (struct sockaddr*)&me, &alen) == -1) {
124 bb_perror_msg_and_die("getsockname");
127 *htype = me.sll_hatype;
132 static void parse_address(char *dev, int hatype, int halen, char *lla, struct ifreq *ifr)
136 memset(ifr, 0, sizeof(*ifr));
137 strncpy(ifr->ifr_name, dev, sizeof(ifr->ifr_name));
138 ifr->ifr_hwaddr.sa_family = hatype;
139 alen = ll_addr_a2n((unsigned char *)(ifr->ifr_hwaddr.sa_data), 14, lla);
143 bb_error_msg_and_die("wrong address (%s) length: expected %d bytes", lla, halen);
148 static void set_address(struct ifreq *ifr, int brd)
154 xioctl(s, SIOCSIFHWBROADCAST, ifr);
156 xioctl(s, SIOCSIFHWADDR, ifr);
161 /* Return value becomes exitcode. It's okay to not return at all */
162 static int do_set(int argc, char **argv)
169 char *newaddr = NULL;
171 struct ifreq ifr0, ifr1;
172 char *newname = NULL;
174 static const char keywords[] =
175 "up\0""down\0""name\0""mtu\0""multicast\0""arp\0""addr\0""dev\0"
177 enum { ARG_up = 1, ARG_down, ARG_name, ARG_mtu, ARG_multicast, ARG_arp,
178 ARG_addr, ARG_dev, PARM_on, PARM_off };
182 key = index_in_strings(keywords, *argv) + 1;
186 } else if (key == ARG_down) {
189 } else if (key == ARG_name) {
192 } else if (key == ARG_mtu) {
195 duparg("mtu", *argv);
196 if (get_integer(&mtu, *argv, 0))
197 invarg(*argv, "mtu");
198 } else if (key == ARG_multicast) {
200 mask |= IFF_MULTICAST;
201 key = index_in_strings(keywords, *argv) + 1;
202 if (key == PARM_on) {
203 flags |= IFF_MULTICAST;
204 } else if (key == PARM_off) {
205 flags &= ~IFF_MULTICAST;
208 } else if (key == ARG_arp) {
211 key = index_in_strings(keywords, *argv) + 1;
212 if (key == PARM_on) {
214 } else if (key == PARM_off) {
218 } else if (key == ARG_addr) {
222 if (key == ARG_dev) {
226 duparg2("dev", *argv);
233 bb_error_msg_and_die(bb_msg_requires_arg, "\"dev\"");
236 if (newaddr || newbrd) {
237 halen = get_address(dev, &htype);
239 parse_address(dev, htype, halen, newaddr, &ifr0);
242 parse_address(dev, htype, halen, newbrd, &ifr1);
246 if (newname && strcmp(dev, newname)) {
247 do_changename(dev, newname);
256 if (newaddr || newbrd) {
258 set_address(&ifr1, 1);
261 set_address(&ifr0, 0);
265 do_chflags(dev, flags, mask);
269 static int ipaddr_list_link(int argc, char **argv)
271 preferred_family = AF_PACKET;
272 return ipaddr_list_or_flush(argc, argv, 0);
275 /* Return value becomes exitcode. It's okay to not return at all */
276 int do_iplink(int argc, char **argv)
278 static const char keywords[] =
279 "set\0""show\0""lst\0""list\0";
282 return ipaddr_list_link(0, NULL);
283 key = index_in_substrings(keywords, *argv) + 1;
285 bb_error_msg_and_die(bb_msg_invalid_arg, *argv, applet_name);
287 if (key == 1) /* set */
288 return do_set(argc, argv);
289 else /* show, lst, list */
290 return ipaddr_list_link(argc, argv);