1 /* vi: set sw=4 ts=4: */
3 * Small implementation of brctl for busybox.
5 * Copyright (C) 2008 by Bernhard 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>
19 /* Maximum number of ports supported per bridge interface. */
24 /* Use internal number parsing and not the "exact" conversion. */
25 /* #define BRCTL_USE_INTERNAL 0 */ /* use exact conversion */
26 #define BRCTL_USE_INTERNAL 1
28 #ifdef ENABLE_FEATURE_BRCTL_SHOW
31 #define ENABLE_FEATURE_BRCTL_SHOW 0
32 #define USE_FEATURE_BRCTL_SHOW(...)
34 #if ENABLE_FEATURE_BRCTL_FANCY
35 #include <linux/if_bridge.h>
37 /* FIXME: These 4 funcs are not really clean and could be improved */
38 static ALWAYS_INLINE void strtotimeval(struct timeval *tv,
42 #if BRCTL_USE_INTERNAL
43 secs = /*bb_*/strtod(time_str, NULL);
46 if (sscanf(time_str, "%lf", &secs) != 1)
48 bb_error_msg_and_die (bb_msg_invalid_arg, time_str, "timespec");
50 tv->tv_usec = 1000000 * (secs - tv->tv_sec);
53 static ALWAYS_INLINE unsigned long __tv_to_jiffies(const struct timeval *tv)
55 unsigned long long jif;
57 jif = 1000000ULL * tv->tv_sec + tv->tv_usec;
62 static void __jiffies_to_tv(struct timeval *tv, unsigned long jiffies)
64 unsigned long long tvusec;
66 tvusec = 10000ULL*jiffies;
67 tv->tv_sec = tvusec/1000000;
68 tv->tv_usec = tvusec - 1000000 * tv->tv_sec;
71 static unsigned long str_to_jiffies(const char *time_str)
74 strtotimeval(&tv, time_str);
75 return __tv_to_jiffies(&tv);
78 static void arm_ioctl(unsigned long *args,
79 unsigned long arg0, unsigned long arg1, unsigned long arg2)
89 int brctl_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
90 int brctl_main(int argc ATTRIBUTE_UNUSED, char **argv)
92 static const char keywords[] ALIGN1 =
93 "addbr\0" "delbr\0" "addif\0" "delif\0"
94 USE_FEATURE_BRCTL_FANCY(
96 "setageing\0" "setfd\0" "sethello\0" "setmaxage\0"
97 "setpathcost\0" "setportprio\0" "setbridgeprio\0"
99 USE_FEATURE_BRCTL_SHOW("showmacs\0" "show\0");
101 enum { ARG_addbr = 0, ARG_delbr, ARG_addif, ARG_delif
102 USE_FEATURE_BRCTL_FANCY(,
104 ARG_setageing, ARG_setfd, ARG_sethello, ARG_setmaxage,
105 ARG_setpathcost, ARG_setportprio, ARG_setbridgeprio
107 USE_FEATURE_BRCTL_SHOW(, ARG_showmacs, ARG_show)
114 #if ENABLE_FEATURE_BRCTL_FANCY
115 unsigned long args[4] = {0, 0, 0, 0};
122 key = index_in_strings(keywords, *argv);
123 if (key == -1) /* no match found in keywords array, bail out. */
124 bb_error_msg_and_die(bb_msg_invalid_arg, *argv, applet_name);
126 #if ENABLE_FEATURE_BRCTL_SHOW
127 if (key == ARG_show) { /* show */
128 goto out; /* FIXME: implement me! :) */
131 fd = xsocket(AF_INET, SOCK_STREAM, 0);
134 if (key == ARG_addbr || key == ARG_delbr) { /* addbr or delbr */
135 ioctl_or_perror_and_die(fd,
136 key == ARG_addbr ? SIOCBRADDBR : SIOCBRDELBR,
137 br, "bridge %s", br);
140 if (!*argv) /* all but 'show' need at least one argument */
142 safe_strncpy(ifr.ifr_name, br, IFNAMSIZ);
143 if (key == ARG_addif || key == ARG_delif) { /* addif or delif */
145 ifr.ifr_ifindex = if_nametoindex(brif);
146 if (!ifr.ifr_ifindex) {
147 bb_perror_msg_and_die("iface %s", brif);
149 ioctl_or_perror_and_die(fd,
150 key == ARG_addif ? SIOCBRADDIF : SIOCBRDELIF,
151 &ifr, "bridge %s", br);
154 #if ENABLE_FEATURE_BRCTL_FANCY
155 ifr.ifr_data = (char *) &args;
156 if (key == ARG_stp) { /* stp */
157 /* FIXME: parsing yes/y/on/1 versus no/n/off/0 is too involved */
158 arm_ioctl(args, BRCTL_SET_BRIDGE_STP_STATE,
159 (unsigned)(**argv - '0'), 0);
162 if ((unsigned)(key - ARG_stp) < 5) { /* time related ops */
163 unsigned long op = (key == ARG_setageing) ? BRCTL_SET_AGEING_TIME :
164 (key == ARG_setfd) ? BRCTL_SET_BRIDGE_FORWARD_DELAY :
165 (key == ARG_sethello) ? BRCTL_SET_BRIDGE_HELLO_TIME :
166 /*key == ARG_setmaxage*/ BRCTL_SET_BRIDGE_MAX_AGE;
167 arm_ioctl(args, op, str_to_jiffies(*argv), 0);
171 if (key == ARG_setpathcost || key == ARG_setportprio) {/* get portnum */
172 int ifidx[MAX_PORTS];
175 port = if_nametoindex(*argv);
177 bb_error_msg_and_die(bb_msg_invalid_arg, *argv, "port");
179 memset(ifidx, 0, sizeof ifidx);
180 arm_ioctl(args, BRCTL_GET_PORT_LIST, (unsigned long)ifidx,
182 xioctl(fd, SIOCDEVPRIVATE, &ifr);
183 for (i = 0; i < MAX_PORTS; i++) {
184 if (ifidx[i] == port) {
190 if (key == ARG_setpathcost
191 || key == ARG_setportprio
192 || key == ARG_setbridgeprio
194 unsigned long op = (key == ARG_setpathcost) ? BRCTL_SET_PATH_COST :
195 (key == ARG_setportprio) ? BRCTL_SET_PORT_PRIORITY :
196 /*key == ARG_setbridgeprio*/ BRCTL_SET_BRIDGE_PRIORITY;
197 unsigned long arg1 = port;
199 # if BRCTL_USE_INTERNAL
202 if (sscanf(*argv, "%i", &tmp) != 1)
203 bb_error_msg_and_die(bb_msg_invalid_arg, *argv,
204 key == ARG_setpathcost ? "cost" : "prio");
206 if (key == ARG_setbridgeprio) {
211 arm_ioctl(args, op, arg1, arg2);
214 /* Execute the previously set command. */
215 xioctl(fd, SIOCDEVPRIVATE, &ifr);
219 if (ENABLE_FEATURE_CLEAN_UP)
222 USE_FEATURE_BRCTL_SHOW(out:)