source: MondoRescue/branches/2.2.5/mindi-busybox/networking/libiproute/iplink.c@ 1765

Last change on this file since 1765 was 1765, checked in by Bruno Cornec, 17 years ago

Update to busybox 1.7.2
File size: 6.3 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * iplink.c "ip link".
4 *
5 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
6 *
7 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
8 */
9
10//#include <sys/ioctl.h>
11//#include <sys/socket.h>
12#include <net/if.h>
13#include <net/if_packet.h>
14#include <netpacket/packet.h>
15#include <net/ethernet.h>
16
17#include "ip_common.h" /* #include "libbb.h" is inside */
18#include "rt_names.h"
19#include "utils.h"
20
21/* taken from linux/sockios.h */
22#define SIOCSIFNAME 0x8923 /* set interface name */
23
24static void on_off(const char *msg) ATTRIBUTE_NORETURN;
25static void on_off(const char *msg)
26{
27 bb_error_msg_and_die("error: argument of \"%s\" must be \"on\" or \"off\"", msg);
28}
29
30/* Exits on error */
31static int get_ctl_fd(void)
32{
33 int fd;
34
35 fd = socket(PF_INET, SOCK_DGRAM, 0);
36 if (fd >= 0)
37 return fd;
38 fd = socket(PF_PACKET, SOCK_DGRAM, 0);
39 if (fd >= 0)
40 return fd;
41 return xsocket(PF_INET6, SOCK_DGRAM, 0);
42}
43
44/* Exits on error */
45static void do_chflags(char *dev, uint32_t flags, uint32_t mask)
46{
47 struct ifreq ifr;
48 int fd;
49
50 strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
51 fd = get_ctl_fd();
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);
57 }
58 close(fd);
59}
60
61/* Exits on error */
62static void do_changename(char *dev, char *newdev)
63{
64 struct ifreq ifr;
65 int fd;
66
67 strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
68 strncpy(ifr.ifr_newname, newdev, sizeof(ifr.ifr_newname));
69 fd = get_ctl_fd();
70 xioctl(fd, SIOCSIFNAME, &ifr);
71 close(fd);
72}
73
74/* Exits on error */
75static void set_qlen(char *dev, int qlen)
76{
77 struct ifreq ifr;
78 int s;
79
80 s = get_ctl_fd();
81 memset(&ifr, 0, sizeof(ifr));
82 strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
83 ifr.ifr_qlen = qlen;
84 xioctl(s, SIOCSIFTXQLEN, &ifr);
85 close(s);
86}
87
88/* Exits on error */
89static void set_mtu(char *dev, int mtu)
90{
91 struct ifreq ifr;
92 int s;
93
94 s = get_ctl_fd();
95 memset(&ifr, 0, sizeof(ifr));
96 strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
97 ifr.ifr_mtu = mtu;
98 xioctl(s, SIOCSIFMTU, &ifr);
99 close(s);
100}
101
102/* Exits on error */
103static int get_address(char *dev, int *htype)
104{
105 struct ifreq ifr;
106 struct sockaddr_ll me;
107 socklen_t alen;
108 int s;
109
110 s = xsocket(PF_PACKET, SOCK_DGRAM, 0);
111
112 memset(&ifr, 0, sizeof(ifr));
113 strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
114 xioctl(s, SIOCGIFINDEX, &ifr);
115
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));
121
122 alen = sizeof(me);
123 if (getsockname(s, (struct sockaddr*)&me, &alen) == -1) {
124 bb_perror_msg_and_die("getsockname");
125 }
126 close(s);
127 *htype = me.sll_hatype;
128 return me.sll_halen;
129}
130
131/* Exits on error */
132static void parse_address(char *dev, int hatype, int halen, char *lla, struct ifreq *ifr)
133{
134 int alen;
135
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);
140 if (alen < 0)
141 exit(1);
142 if (alen != halen) {
143 bb_error_msg_and_die("wrong address (%s) length: expected %d bytes", lla, halen);
144 }
145}
146
147/* Exits on error */
148static void set_address(struct ifreq *ifr, int brd)
149{
150 int s;
151
152 s = get_ctl_fd();
153 if (brd)
154 xioctl(s, SIOCSIFHWBROADCAST, ifr);
155 else
156 xioctl(s, SIOCSIFHWADDR, ifr);
157 close(s);
158}
159
160
161/* Return value becomes exitcode. It's okay to not return at all */
162static int do_set(int argc, char **argv)
163{
164 char *dev = NULL;
165 uint32_t mask = 0;
166 uint32_t flags = 0;
167 int qlen = -1;
168 int mtu = -1;
169 char *newaddr = NULL;
170 char *newbrd = NULL;
171 struct ifreq ifr0, ifr1;
172 char *newname = NULL;
173 int htype, halen;
174 static const char keywords[] ALIGN1 =
175 "up\0""down\0""name\0""mtu\0""multicast\0""arp\0""addr\0""dev\0"
176 "on\0""off\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 };
179 smalluint key;
180
181 while (argc > 0) {
182 key = index_in_strings(keywords, *argv) + 1;
183 if (key == ARG_up) {
184 mask |= IFF_UP;
185 flags |= IFF_UP;
186 } else if (key == ARG_down) {
187 mask |= IFF_UP;
188 flags &= ~IFF_UP;
189 } else if (key == ARG_name) {
190 NEXT_ARG();
191 newname = *argv;
192 } else if (key == ARG_mtu) {
193 NEXT_ARG();
194 if (mtu != -1)
195 duparg("mtu", *argv);
196 if (get_integer(&mtu, *argv, 0))
197 invarg(*argv, "mtu");
198 } else if (key == ARG_multicast) {
199 NEXT_ARG();
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;
206 } else
207 on_off("multicast");
208 } else if (key == ARG_arp) {
209 NEXT_ARG();
210 mask |= IFF_NOARP;
211 key = index_in_strings(keywords, *argv) + 1;
212 if (key == PARM_on) {
213 flags &= ~IFF_NOARP;
214 } else if (key == PARM_off) {
215 flags |= IFF_NOARP;
216 } else
217 on_off("arp");
218 } else if (key == ARG_addr) {
219 NEXT_ARG();
220 newaddr = *argv;
221 } else {
222 if (key == ARG_dev) {
223 NEXT_ARG();
224 }
225 if (dev)
226 duparg2("dev", *argv);
227 dev = *argv;
228 }
229 argc--; argv++;
230 }
231
232 if (!dev) {
233 bb_error_msg_and_die(bb_msg_requires_arg, "\"dev\"");
234 }
235
236 if (newaddr || newbrd) {
237 halen = get_address(dev, &htype);
238 if (newaddr) {
239 parse_address(dev, htype, halen, newaddr, &ifr0);
240 }
241 if (newbrd) {
242 parse_address(dev, htype, halen, newbrd, &ifr1);
243 }
244 }
245
246 if (newname && strcmp(dev, newname)) {
247 do_changename(dev, newname);
248 dev = newname;
249 }
250 if (qlen != -1) {
251 set_qlen(dev, qlen);
252 }
253 if (mtu != -1) {
254 set_mtu(dev, mtu);
255 }
256 if (newaddr || newbrd) {
257 if (newbrd) {
258 set_address(&ifr1, 1);
259 }
260 if (newaddr) {
261 set_address(&ifr0, 0);
262 }
263 }
264 if (mask)
265 do_chflags(dev, flags, mask);
266 return 0;
267}
268
269static int ipaddr_list_link(int argc, char **argv)
270{
271 preferred_family = AF_PACKET;
272 return ipaddr_list_or_flush(argc, argv, 0);
273}
274
275/* Return value becomes exitcode. It's okay to not return at all */
276int do_iplink(int argc, char **argv)
277{
278 static const char keywords[] ALIGN1 =
279 "set\0""show\0""lst\0""list\0";
280 smalluint key;
281 if (argc <= 0)
282 return ipaddr_list_link(0, NULL);
283 key = index_in_substrings(keywords, *argv) + 1;
284 if (key == 0)
285 bb_error_msg_and_die(bb_msg_invalid_arg, *argv, applet_name);
286 argc--; argv++;
287 if (key == 1) /* set */
288 return do_set(argc, argv);
289 else /* show, lst, list */
290 return ipaddr_list_link(argc, argv);
291}
Note: See TracBrowser for help on using the repository browser.