source: MondoRescue/branches/stable/mindi-busybox/networking/libiproute/iplink.c@ 821

Last change on this file since 821 was 821, checked in by Bruno Cornec, 18 years ago

Addition of busybox 1.2.1 as a mindi-busybox new package
This should avoid delivering binary files in mindi not built there (Fedora and Debian are quite serious about that)
File size: 6.6 KB
Line 
1/*
2 * iplink.c "ip link".
3 *
4 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
5 *
6 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
7 */
8
9#include "libbb.h"
10
11#include <sys/ioctl.h>
12#include <sys/socket.h>
13
14#include <errno.h>
15#include <string.h>
16#include <unistd.h>
17
18#include <net/if.h>
19#include <net/if_packet.h>
20#include <netpacket/packet.h>
21
22#include <net/ethernet.h>
23
24#include "rt_names.h"
25#include "utils.h"
26#include "ip_common.h"
27
28/* take from linux/sockios.h */
29#define SIOCSIFNAME 0x8923 /* set interface name */
30
31static int do_link;
32
33static int on_off(char *msg)
34{
35 bb_error_msg("Error: argument of \"%s\" must be \"on\" or \"off\"", msg);
36 return -1;
37}
38
39static int get_ctl_fd(void)
40{
41 int s_errno;
42 int fd;
43
44 fd = socket(PF_INET, SOCK_DGRAM, 0);
45 if (fd >= 0)
46 return fd;
47 s_errno = errno;
48 fd = socket(PF_PACKET, SOCK_DGRAM, 0);
49 if (fd >= 0)
50 return fd;
51 fd = socket(PF_INET6, SOCK_DGRAM, 0);
52 if (fd >= 0)
53 return fd;
54 errno = s_errno;
55 perror("Cannot create control socket");
56 return -1;
57}
58
59static int do_chflags(char *dev, __u32 flags, __u32 mask)
60{
61 struct ifreq ifr;
62 int fd;
63 int err;
64
65 strcpy(ifr.ifr_name, dev);
66 fd = get_ctl_fd();
67 if (fd < 0)
68 return -1;
69 err = ioctl(fd, SIOCGIFFLAGS, &ifr);
70 if (err) {
71 perror("SIOCGIFFLAGS");
72 close(fd);
73 return -1;
74 }
75 if ((ifr.ifr_flags^flags)&mask) {
76 ifr.ifr_flags &= ~mask;
77 ifr.ifr_flags |= mask&flags;
78 err = ioctl(fd, SIOCSIFFLAGS, &ifr);
79 if (err)
80 perror("SIOCSIFFLAGS");
81 }
82 close(fd);
83 return err;
84}
85
86static int do_changename(char *dev, char *newdev)
87{
88 struct ifreq ifr;
89 int fd;
90 int err;
91
92 strcpy(ifr.ifr_name, dev);
93 strcpy(ifr.ifr_newname, newdev);
94 fd = get_ctl_fd();
95 if (fd < 0)
96 return -1;
97 err = ioctl(fd, SIOCSIFNAME, &ifr);
98 if (err) {
99 perror("SIOCSIFNAME");
100 close(fd);
101 return -1;
102 }
103 close(fd);
104 return err;
105}
106
107static int set_qlen(char *dev, int qlen)
108{
109 struct ifreq ifr;
110 int s;
111
112 s = get_ctl_fd();
113 if (s < 0)
114 return -1;
115
116 memset(&ifr, 0, sizeof(ifr));
117 strcpy(ifr.ifr_name, dev);
118 ifr.ifr_qlen = qlen;
119 if (ioctl(s, SIOCSIFTXQLEN, &ifr) < 0) {
120 perror("SIOCSIFXQLEN");
121 close(s);
122 return -1;
123 }
124 close(s);
125
126 return 0;
127}
128
129static int set_mtu(char *dev, int mtu)
130{
131 struct ifreq ifr;
132 int s;
133
134 s = get_ctl_fd();
135 if (s < 0)
136 return -1;
137
138 memset(&ifr, 0, sizeof(ifr));
139 strcpy(ifr.ifr_name, dev);
140 ifr.ifr_mtu = mtu;
141 if (ioctl(s, SIOCSIFMTU, &ifr) < 0) {
142 perror("SIOCSIFMTU");
143 close(s);
144 return -1;
145 }
146 close(s);
147
148 return 0;
149}
150
151static int get_address(char *dev, int *htype)
152{
153 struct ifreq ifr;
154 struct sockaddr_ll me;
155 socklen_t alen;
156 int s;
157
158 s = socket(PF_PACKET, SOCK_DGRAM, 0);
159 if (s < 0) {
160 perror("socket(PF_PACKET)");
161 return -1;
162 }
163
164 memset(&ifr, 0, sizeof(ifr));
165 strcpy(ifr.ifr_name, dev);
166 if (ioctl(s, SIOCGIFINDEX, &ifr) < 0) {
167 perror("SIOCGIFINDEX");
168 close(s);
169 return -1;
170 }
171
172 memset(&me, 0, sizeof(me));
173 me.sll_family = AF_PACKET;
174 me.sll_ifindex = ifr.ifr_ifindex;
175 me.sll_protocol = htons(ETH_P_LOOP);
176 if (bind(s, (struct sockaddr*)&me, sizeof(me)) == -1) {
177 perror("bind");
178 close(s);
179 return -1;
180 }
181
182 alen = sizeof(me);
183 if (getsockname(s, (struct sockaddr*)&me, &alen) == -1) {
184 perror("getsockname");
185 close(s);
186 return -1;
187 }
188 close(s);
189 *htype = me.sll_hatype;
190 return me.sll_halen;
191}
192
193static int parse_address(char *dev, int hatype, int halen, char *lla, struct ifreq *ifr)
194{
195 int alen;
196
197 memset(ifr, 0, sizeof(*ifr));
198 strcpy(ifr->ifr_name, dev);
199 ifr->ifr_hwaddr.sa_family = hatype;
200 alen = ll_addr_a2n((unsigned char *)(ifr->ifr_hwaddr.sa_data), 14, lla);
201 if (alen < 0)
202 return -1;
203 if (alen != halen) {
204 bb_error_msg("Wrong address (%s) length: expected %d bytes", lla, halen);
205 return -1;
206 }
207 return 0;
208}
209
210static int set_address(struct ifreq *ifr, int brd)
211{
212 int s;
213
214 s = get_ctl_fd();
215 if (s < 0)
216 return -1;
217 if (ioctl(s, brd?SIOCSIFHWBROADCAST:SIOCSIFHWADDR, ifr) < 0) {
218 perror(brd?"SIOCSIFHWBROADCAST":"SIOCSIFHWADDR");
219 close(s);
220 return -1;
221 }
222 close(s);
223 return 0;
224}
225
226
227static int do_set(int argc, char **argv)
228{
229 char *dev = NULL;
230 __u32 mask = 0;
231 __u32 flags = 0;
232 int qlen = -1;
233 int mtu = -1;
234 char *newaddr = NULL;
235 char *newbrd = NULL;
236 struct ifreq ifr0, ifr1;
237 char *newname = NULL;
238 int htype, halen;
239
240 while (argc > 0) {
241 if (strcmp(*argv, "up") == 0) {
242 mask |= IFF_UP;
243 flags |= IFF_UP;
244 } else if (strcmp(*argv, "down") == 0) {
245 mask |= IFF_UP;
246 flags &= ~IFF_UP;
247 } else if (strcmp(*argv, "name") == 0) {
248 NEXT_ARG();
249 newname = *argv;
250 } else if (strcmp(*argv, "mtu") == 0) {
251 NEXT_ARG();
252 if (mtu != -1)
253 duparg("mtu", *argv);
254 if (get_integer(&mtu, *argv, 0))
255 invarg(*argv, "mtu");
256 } else if (strcmp(*argv, "multicast") == 0) {
257 NEXT_ARG();
258 mask |= IFF_MULTICAST;
259 if (strcmp(*argv, "on") == 0) {
260 flags |= IFF_MULTICAST;
261 } else if (strcmp(*argv, "off") == 0) {
262 flags &= ~IFF_MULTICAST;
263 } else
264 return on_off("multicast");
265 } else if (strcmp(*argv, "arp") == 0) {
266 NEXT_ARG();
267 mask |= IFF_NOARP;
268 if (strcmp(*argv, "on") == 0) {
269 flags &= ~IFF_NOARP;
270 } else if (strcmp(*argv, "off") == 0) {
271 flags |= IFF_NOARP;
272 } else
273 return on_off("noarp");
274 } else if (strcmp(*argv, "addr") == 0) {
275 NEXT_ARG();
276 newaddr = *argv;
277 } else {
278 if (strcmp(*argv, "dev") == 0) {
279 NEXT_ARG();
280 }
281 if (dev)
282 duparg2("dev", *argv);
283 dev = *argv;
284 }
285 argc--; argv++;
286 }
287
288 if (!dev) {
289 bb_error_msg(bb_msg_requires_arg, "\"dev\"");
290 exit(-1);
291 }
292
293 if (newaddr || newbrd) {
294 halen = get_address(dev, &htype);
295 if (halen < 0)
296 return -1;
297 if (newaddr) {
298 if (parse_address(dev, htype, halen, newaddr, &ifr0) < 0)
299 return -1;
300 }
301 if (newbrd) {
302 if (parse_address(dev, htype, halen, newbrd, &ifr1) < 0)
303 return -1;
304 }
305 }
306
307 if (newname && strcmp(dev, newname)) {
308 if (do_changename(dev, newname) < 0)
309 return -1;
310 dev = newname;
311 }
312 if (qlen != -1) {
313 if (set_qlen(dev, qlen) < 0)
314 return -1;
315 }
316 if (mtu != -1) {
317 if (set_mtu(dev, mtu) < 0)
318 return -1;
319 }
320 if (newaddr || newbrd) {
321 if (newbrd) {
322 if (set_address(&ifr1, 1) < 0)
323 return -1;
324 }
325 if (newaddr) {
326 if (set_address(&ifr0, 0) < 0)
327 return -1;
328 }
329 }
330 if (mask)
331 return do_chflags(dev, flags, mask);
332 return 0;
333}
334
335static int ipaddr_list_link(int argc, char **argv)
336{
337 preferred_family = AF_PACKET;
338 do_link = 1;
339 return ipaddr_list_or_flush(argc, argv, 0);
340}
341
342int do_iplink(int argc, char **argv)
343{
344 if (argc > 0) {
345 if (matches(*argv, "set") == 0)
346 return do_set(argc-1, argv+1);
347 if (matches(*argv, "show") == 0 ||
348 matches(*argv, "lst") == 0 ||
349 matches(*argv, "list") == 0)
350 return ipaddr_list_link(argc-1, argv+1);
351 } else
352 return ipaddr_list_link(0, NULL);
353
354 bb_error_msg("Command \"%s\" is unknown.", *argv);
355 exit(-1);
356}
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