1 /* vi: set sw=4 ts=4: */
3 * Small implementation of brctl for busybox.
5 * Copyright (C) 2008 by Bernhard Reutner-Fischer
7 * Some helper functions from bridge-utils are
8 * Copyright (C) 2000 Lennert Buytenhek
10 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
12 /* This applet currently uses only the ioctl interface and no sysfs at all.
13 * At the time of this writing this was considered a feature.
16 #include <linux/sockios.h>
20 # define SIOCBRADDBR BRCTL_ADD_BRIDGE
23 # define SIOCBRDELBR BRCTL_DEL_BRIDGE
26 # define SIOCBRADDIF BRCTL_ADD_IF
29 # define SIOCBRDELIF BRCTL_DEL_IF
33 /* Maximum number of ports supported per bridge interface. */
38 /* Use internal number parsing and not the "exact" conversion. */
39 /* #define BRCTL_USE_INTERNAL 0 */ /* use exact conversion */
40 #define BRCTL_USE_INTERNAL 1
42 #if ENABLE_FEATURE_BRCTL_FANCY
43 # include <linux/if_bridge.h>
45 /* FIXME: These 4 funcs are not really clean and could be improved */
46 static ALWAYS_INLINE void strtotimeval(struct timeval *tv,
50 # if BRCTL_USE_INTERNAL
52 secs = /*bb_*/strtod(time_str, &endptr);
53 if (endptr == time_str)
55 if (sscanf(time_str, "%lf", &secs) != 1)
57 bb_error_msg_and_die(bb_msg_invalid_arg, time_str, "timespec");
59 tv->tv_usec = 1000000 * (secs - tv->tv_sec);
62 static ALWAYS_INLINE unsigned long tv_to_jiffies(const struct timeval *tv)
64 unsigned long long jif;
66 jif = 1000000ULL * tv->tv_sec + tv->tv_usec;
71 static void jiffies_to_tv(struct timeval *tv, unsigned long jiffies)
73 unsigned long long tvusec;
75 tvusec = 10000ULL*jiffies;
76 tv->tv_sec = tvusec/1000000;
77 tv->tv_usec = tvusec - 1000000 * tv->tv_sec;
80 static unsigned long str_to_jiffies(const char *time_str)
83 strtotimeval(&tv, time_str);
84 return tv_to_jiffies(&tv);
87 static void arm_ioctl(unsigned long *args,
88 unsigned long arg0, unsigned long arg1, unsigned long arg2)
98 int brctl_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
99 int brctl_main(int argc UNUSED_PARAM, char **argv)
101 static const char keywords[] ALIGN1 =
102 "addbr\0" "delbr\0" "addif\0" "delif\0"
103 IF_FEATURE_BRCTL_FANCY(
105 "setageing\0" "setfd\0" "sethello\0" "setmaxage\0"
106 "setpathcost\0" "setportprio\0" "setbridgeprio\0"
108 IF_FEATURE_BRCTL_SHOW("showmacs\0" "show\0");
110 enum { ARG_addbr = 0, ARG_delbr, ARG_addif, ARG_delif
111 IF_FEATURE_BRCTL_FANCY(,
113 ARG_setageing, ARG_setfd, ARG_sethello, ARG_setmaxage,
114 ARG_setpathcost, ARG_setportprio, ARG_setbridgeprio
116 IF_FEATURE_BRCTL_SHOW(, ARG_showmacs, ARG_show)
126 #if ENABLE_FEATURE_BRCTL_FANCY
127 int ifidx[MAX_PORTS];
128 unsigned long args[4];
129 ifr.ifr_data = (char *) &args;
132 key = index_in_strings(keywords, *argv);
133 if (key == -1) /* no match found in keywords array, bail out. */
134 bb_error_msg_and_die(bb_msg_invalid_arg, *argv, applet_name);
136 fd = xsocket(AF_INET, SOCK_STREAM, 0);
138 #if ENABLE_FEATURE_BRCTL_SHOW
139 if (key == ARG_show) { /* show */
140 char brname[IFNAMSIZ];
141 int bridx[MAX_PORTS];
143 arm_ioctl(args, BRCTL_GET_BRIDGES,
144 (unsigned long) bridx, MAX_PORTS);
145 num = xioctl(fd, SIOCGIFBR, args);
146 printf("bridge name\tbridge id\t\tSTP enabled\tinterfaces\n");
147 for (i = 0; i < num; i++) {
148 char ifname[IFNAMSIZ];
150 struct __bridge_info bi;
153 if (!if_indextoname(bridx[i], brname))
154 bb_perror_msg_and_die("can't get bridge name for index %d", i);
155 strncpy_IFNAMSIZ(ifr.ifr_name, brname);
157 arm_ioctl(args, BRCTL_GET_BRIDGE_INFO,
158 (unsigned long) &bi, 0);
159 xioctl(fd, SIOCDEVPRIVATE, &ifr);
160 printf("%s\t\t", brname);
162 /* print bridge id */
163 x = (unsigned char *) &bi.bridge_id;
164 for (j = 0; j < 8; j++) {
165 printf("%.2x", x[j]);
169 printf(bi.stp_enabled ? "\tyes" : "\tno");
171 /* print interface list */
172 arm_ioctl(args, BRCTL_GET_PORT_LIST,
173 (unsigned long) ifidx, MAX_PORTS);
174 xioctl(fd, SIOCDEVPRIVATE, &ifr);
176 for (j = 0; j < MAX_PORTS; j++) {
179 if (!if_indextoname(ifidx[j], ifname))
180 bb_perror_msg_and_die("can't get interface name for index %d", j);
182 printf("\t\t\t\t\t");
185 printf("\t\t%s\n", ifname);
187 if (!tabs) /* bridge has no interfaces */
194 if (!*argv) /* all but 'show' need at least one argument */
199 if (key == ARG_addbr || key == ARG_delbr) { /* addbr or delbr */
200 ioctl_or_perror_and_die(fd,
201 key == ARG_addbr ? SIOCBRADDBR : SIOCBRDELBR,
202 br, "bridge %s", br);
206 if (!*argv) /* all but 'addbr/delbr' need at least two arguments */
209 strncpy_IFNAMSIZ(ifr.ifr_name, br);
210 if (key == ARG_addif || key == ARG_delif) { /* addif or delif */
212 ifr.ifr_ifindex = if_nametoindex(brif);
213 if (!ifr.ifr_ifindex) {
214 bb_perror_msg_and_die("iface %s", brif);
216 ioctl_or_perror_and_die(fd,
217 key == ARG_addif ? SIOCBRADDIF : SIOCBRDELIF,
218 &ifr, "bridge %s", br);
221 #if ENABLE_FEATURE_BRCTL_FANCY
222 if (key == ARG_stp) { /* stp */
223 static const char no_yes[] ALIGN1 =
224 "0\0" "off\0" "n\0" "no\0" /* 0 .. 3 */
225 "1\0" "on\0" "y\0" "yes\0"; /* 4 .. 7 */
226 int onoff = index_in_strings(no_yes, *argv);
228 bb_error_msg_and_die(bb_msg_invalid_arg, *argv, applet_name);
229 onoff = (unsigned)onoff / 4;
230 arm_ioctl(args, BRCTL_SET_BRIDGE_STP_STATE, onoff, 0);
233 if ((unsigned)(key - ARG_setageing) < 4) { /* time related ops */
234 static const uint8_t ops[] ALIGN1 = {
235 BRCTL_SET_AGEING_TIME, /* ARG_setageing */
236 BRCTL_SET_BRIDGE_FORWARD_DELAY, /* ARG_setfd */
237 BRCTL_SET_BRIDGE_HELLO_TIME, /* ARG_sethello */
238 BRCTL_SET_BRIDGE_MAX_AGE /* ARG_setmaxage */
240 arm_ioctl(args, ops[key - ARG_setageing], str_to_jiffies(*argv), 0);
243 if (key == ARG_setpathcost
244 || key == ARG_setportprio
245 || key == ARG_setbridgeprio
247 static const uint8_t ops[] ALIGN1 = {
248 BRCTL_SET_PATH_COST, /* ARG_setpathcost */
249 BRCTL_SET_PORT_PRIORITY, /* ARG_setportprio */
250 BRCTL_SET_BRIDGE_PRIORITY /* ARG_setbridgeprio */
255 if (key != ARG_setbridgeprio) {
259 port = if_nametoindex(*argv++);
261 bb_error_msg_and_die(bb_msg_invalid_arg, *argv, "port");
262 memset(ifidx, 0, sizeof ifidx);
263 arm_ioctl(args, BRCTL_GET_PORT_LIST, (unsigned long)ifidx,
265 xioctl(fd, SIOCDEVPRIVATE, &ifr);
266 for (i = 0; i < MAX_PORTS; i++) {
267 if (ifidx[i] == port) {
274 arg2 = xatoi_u(*argv);
275 if (key == ARG_setbridgeprio) {
279 arm_ioctl(args, ops[key - ARG_setpathcost], arg1, arg2);
282 /* Execute the previously set command */
283 xioctl(fd, SIOCDEVPRIVATE, &ifr);