blob: 207b069aad612df4d127c38fe5cac0146470cc31
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * Small implementation of brctl for busybox. |
4 | * |
5 | * Copyright (C) 2008 by Bernhard Reutner-Fischer |
6 | * |
7 | * Some helper functions from bridge-utils are |
8 | * Copyright (C) 2000 Lennert Buytenhek |
9 | * |
10 | * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
11 | */ |
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. |
14 | */ |
15 | |
16 | //usage:#define brctl_trivial_usage |
17 | //usage: "COMMAND [BRIDGE [INTERFACE]]" |
18 | //usage:#define brctl_full_usage "\n\n" |
19 | //usage: "Manage ethernet bridges\n" |
20 | //usage: "\nCommands:" |
21 | //usage: IF_FEATURE_BRCTL_SHOW( |
22 | //usage: "\n show Show a list of bridges" |
23 | //usage: ) |
24 | //usage: "\n addbr BRIDGE Create BRIDGE" |
25 | //usage: "\n delbr BRIDGE Delete BRIDGE" |
26 | //usage: "\n addif BRIDGE IFACE Add IFACE to BRIDGE" |
27 | //usage: "\n delif BRIDGE IFACE Delete IFACE from BRIDGE" |
28 | //usage: IF_FEATURE_BRCTL_FANCY( |
29 | //usage: "\n setageing BRIDGE TIME Set ageing time" |
30 | //usage: "\n setfd BRIDGE TIME Set bridge forward delay" |
31 | //usage: "\n sethello BRIDGE TIME Set hello time" |
32 | //usage: "\n setmaxage BRIDGE TIME Set max message age" |
33 | //usage: "\n setpathcost BRIDGE COST Set path cost" |
34 | //usage: "\n setportprio BRIDGE PRIO Set port priority" |
35 | //usage: "\n setbridgeprio BRIDGE PRIO Set bridge priority" |
36 | //usage: "\n stp BRIDGE [1/yes/on|0/no/off] STP on/off" |
37 | //usage: ) |
38 | |
39 | #include "libbb.h" |
40 | #include <linux/sockios.h> |
41 | #include <net/if.h> |
42 | |
43 | #ifndef SIOCBRADDBR |
44 | # define SIOCBRADDBR BRCTL_ADD_BRIDGE |
45 | #endif |
46 | #ifndef SIOCBRDELBR |
47 | # define SIOCBRDELBR BRCTL_DEL_BRIDGE |
48 | #endif |
49 | #ifndef SIOCBRADDIF |
50 | # define SIOCBRADDIF BRCTL_ADD_IF |
51 | #endif |
52 | #ifndef SIOCBRDELIF |
53 | # define SIOCBRDELIF BRCTL_DEL_IF |
54 | #endif |
55 | |
56 | |
57 | /* Maximum number of ports supported per bridge interface. */ |
58 | #ifndef MAX_PORTS |
59 | # define MAX_PORTS 32 |
60 | #endif |
61 | |
62 | /* Use internal number parsing and not the "exact" conversion. */ |
63 | /* #define BRCTL_USE_INTERNAL 0 */ /* use exact conversion */ |
64 | #define BRCTL_USE_INTERNAL 1 |
65 | |
66 | #if ENABLE_FEATURE_BRCTL_FANCY |
67 | # include <linux/if_bridge.h> |
68 | |
69 | /* FIXME: These 4 funcs are not really clean and could be improved */ |
70 | static ALWAYS_INLINE void bb_strtotimeval(struct timeval *tv, |
71 | const char *time_str) |
72 | { |
73 | double secs; |
74 | # if BRCTL_USE_INTERNAL |
75 | char *endptr; |
76 | secs = /*bb_*/strtod(time_str, &endptr); |
77 | if (endptr == time_str) |
78 | # else |
79 | if (sscanf(time_str, "%lf", &secs) != 1) |
80 | # endif |
81 | bb_error_msg_and_die(bb_msg_invalid_arg, time_str, "timespec"); |
82 | tv->tv_sec = secs; |
83 | tv->tv_usec = 1000000 * (secs - tv->tv_sec); |
84 | } |
85 | |
86 | static ALWAYS_INLINE unsigned long tv_to_jiffies(const struct timeval *tv) |
87 | { |
88 | unsigned long long jif; |
89 | |
90 | jif = 1000000ULL * tv->tv_sec + tv->tv_usec; |
91 | |
92 | return jif/10000; |
93 | } |
94 | # if 0 |
95 | static void jiffies_to_tv(struct timeval *tv, unsigned long jiffies) |
96 | { |
97 | unsigned long long tvusec; |
98 | |
99 | tvusec = 10000ULL*jiffies; |
100 | tv->tv_sec = tvusec/1000000; |
101 | tv->tv_usec = tvusec - 1000000 * tv->tv_sec; |
102 | } |
103 | # endif |
104 | static unsigned long str_to_jiffies(const char *time_str) |
105 | { |
106 | struct timeval tv; |
107 | bb_strtotimeval(&tv, time_str); |
108 | return tv_to_jiffies(&tv); |
109 | } |
110 | |
111 | static void arm_ioctl(unsigned long *args, |
112 | unsigned long arg0, unsigned long arg1, unsigned long arg2) |
113 | { |
114 | args[0] = arg0; |
115 | args[1] = arg1; |
116 | args[2] = arg2; |
117 | args[3] = 0; |
118 | } |
119 | #endif |
120 | |
121 | |
122 | int brctl_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
123 | int brctl_main(int argc UNUSED_PARAM, char **argv) |
124 | { |
125 | static const char keywords[] ALIGN1 = |
126 | "addbr\0" "delbr\0" "addif\0" "delif\0" |
127 | IF_FEATURE_BRCTL_FANCY( |
128 | "stp\0" |
129 | "setageing\0" "setfd\0" "sethello\0" "setmaxage\0" |
130 | "setpathcost\0" "setportprio\0" "setbridgeprio\0" |
131 | ) |
132 | IF_FEATURE_BRCTL_SHOW("show\0"); |
133 | |
134 | enum { ARG_addbr = 0, ARG_delbr, ARG_addif, ARG_delif |
135 | IF_FEATURE_BRCTL_FANCY(, |
136 | ARG_stp, |
137 | ARG_setageing, ARG_setfd, ARG_sethello, ARG_setmaxage, |
138 | ARG_setpathcost, ARG_setportprio, ARG_setbridgeprio |
139 | ) |
140 | IF_FEATURE_BRCTL_SHOW(, ARG_show) |
141 | }; |
142 | |
143 | int fd; |
144 | smallint key; |
145 | struct ifreq ifr; |
146 | char *br, *brif; |
147 | |
148 | argv++; |
149 | while (*argv) { |
150 | #if ENABLE_FEATURE_BRCTL_FANCY |
151 | int ifidx[MAX_PORTS]; |
152 | unsigned long args[4]; |
153 | ifr.ifr_data = (char *) &args; |
154 | #endif |
155 | |
156 | key = index_in_strings(keywords, *argv); |
157 | if (key == -1) /* no match found in keywords array, bail out. */ |
158 | bb_error_msg_and_die(bb_msg_invalid_arg, *argv, applet_name); |
159 | argv++; |
160 | fd = xsocket(AF_INET, SOCK_STREAM, 0); |
161 | |
162 | #if ENABLE_FEATURE_BRCTL_SHOW |
163 | if (key == ARG_show) { /* show */ |
164 | char brname[IFNAMSIZ]; |
165 | int bridx[MAX_PORTS]; |
166 | int i, num; |
167 | arm_ioctl(args, BRCTL_GET_BRIDGES, |
168 | (unsigned long) bridx, MAX_PORTS); |
169 | num = xioctl(fd, SIOCGIFBR, args); |
170 | printf("bridge name\tbridge id\t\tSTP enabled\tinterfaces\n"); |
171 | for (i = 0; i < num; i++) { |
172 | char ifname[IFNAMSIZ]; |
173 | int j, tabs; |
174 | struct __bridge_info bi; |
175 | unsigned char *x; |
176 | |
177 | if (!if_indextoname(bridx[i], brname)) |
178 | bb_perror_msg_and_die("can't get bridge name for index %d", i); |
179 | strncpy_IFNAMSIZ(ifr.ifr_name, brname); |
180 | |
181 | arm_ioctl(args, BRCTL_GET_BRIDGE_INFO, |
182 | (unsigned long) &bi, 0); |
183 | xioctl(fd, SIOCDEVPRIVATE, &ifr); |
184 | printf("%s\t\t", brname); |
185 | |
186 | /* print bridge id */ |
187 | x = (unsigned char *) &bi.bridge_id; |
188 | for (j = 0; j < 8; j++) { |
189 | printf("%.2x", x[j]); |
190 | if (j == 1) |
191 | bb_putchar('.'); |
192 | } |
193 | printf(bi.stp_enabled ? "\tyes" : "\tno"); |
194 | |
195 | /* print interface list */ |
196 | arm_ioctl(args, BRCTL_GET_PORT_LIST, |
197 | (unsigned long) ifidx, MAX_PORTS); |
198 | xioctl(fd, SIOCDEVPRIVATE, &ifr); |
199 | tabs = 0; |
200 | for (j = 0; j < MAX_PORTS; j++) { |
201 | if (!ifidx[j]) |
202 | continue; |
203 | if (!if_indextoname(ifidx[j], ifname)) |
204 | bb_perror_msg_and_die("can't get interface name for index %d", j); |
205 | if (tabs) |
206 | printf("\t\t\t\t\t"); |
207 | else |
208 | tabs = 1; |
209 | printf("\t\t%s\n", ifname); |
210 | } |
211 | if (!tabs) /* bridge has no interfaces */ |
212 | bb_putchar('\n'); |
213 | } |
214 | goto done; |
215 | } |
216 | #endif |
217 | |
218 | if (!*argv) /* all but 'show' need at least one argument */ |
219 | bb_show_usage(); |
220 | |
221 | br = *argv++; |
222 | |
223 | if (key == ARG_addbr || key == ARG_delbr) { /* addbr or delbr */ |
224 | ioctl_or_perror_and_die(fd, |
225 | key == ARG_addbr ? SIOCBRADDBR : SIOCBRDELBR, |
226 | br, "bridge %s", br); |
227 | goto done; |
228 | } |
229 | |
230 | if (!*argv) /* all but 'addbr/delbr' need at least two arguments */ |
231 | bb_show_usage(); |
232 | |
233 | strncpy_IFNAMSIZ(ifr.ifr_name, br); |
234 | if (key == ARG_addif || key == ARG_delif) { /* addif or delif */ |
235 | brif = *argv; |
236 | ifr.ifr_ifindex = if_nametoindex(brif); |
237 | if (!ifr.ifr_ifindex) { |
238 | bb_perror_msg_and_die("iface %s", brif); |
239 | } |
240 | ioctl_or_perror_and_die(fd, |
241 | key == ARG_addif ? SIOCBRADDIF : SIOCBRDELIF, |
242 | &ifr, "bridge %s", br); |
243 | goto done_next_argv; |
244 | } |
245 | #if ENABLE_FEATURE_BRCTL_FANCY |
246 | if (key == ARG_stp) { /* stp */ |
247 | static const char no_yes[] ALIGN1 = |
248 | "0\0" "off\0" "n\0" "no\0" /* 0 .. 3 */ |
249 | "1\0" "on\0" "y\0" "yes\0"; /* 4 .. 7 */ |
250 | int onoff = index_in_strings(no_yes, *argv); |
251 | if (onoff < 0) |
252 | bb_error_msg_and_die(bb_msg_invalid_arg, *argv, applet_name); |
253 | onoff = (unsigned)onoff / 4; |
254 | arm_ioctl(args, BRCTL_SET_BRIDGE_STP_STATE, onoff, 0); |
255 | goto fire; |
256 | } |
257 | if ((unsigned)(key - ARG_setageing) < 4) { /* time related ops */ |
258 | static const uint8_t ops[] ALIGN1 = { |
259 | BRCTL_SET_AGEING_TIME, /* ARG_setageing */ |
260 | BRCTL_SET_BRIDGE_FORWARD_DELAY, /* ARG_setfd */ |
261 | BRCTL_SET_BRIDGE_HELLO_TIME, /* ARG_sethello */ |
262 | BRCTL_SET_BRIDGE_MAX_AGE /* ARG_setmaxage */ |
263 | }; |
264 | arm_ioctl(args, ops[key - ARG_setageing], str_to_jiffies(*argv), 0); |
265 | goto fire; |
266 | } |
267 | if (key == ARG_setpathcost |
268 | || key == ARG_setportprio |
269 | || key == ARG_setbridgeprio |
270 | ) { |
271 | static const uint8_t ops[] ALIGN1 = { |
272 | BRCTL_SET_PATH_COST, /* ARG_setpathcost */ |
273 | BRCTL_SET_PORT_PRIORITY, /* ARG_setportprio */ |
274 | BRCTL_SET_BRIDGE_PRIORITY /* ARG_setbridgeprio */ |
275 | }; |
276 | int port = -1; |
277 | unsigned arg1, arg2; |
278 | |
279 | if (key != ARG_setbridgeprio) { |
280 | /* get portnum */ |
281 | unsigned i; |
282 | |
283 | port = if_nametoindex(*argv++); |
284 | if (!port) |
285 | bb_error_msg_and_die(bb_msg_invalid_arg, *argv, "port"); |
286 | memset(ifidx, 0, sizeof ifidx); |
287 | arm_ioctl(args, BRCTL_GET_PORT_LIST, (unsigned long)ifidx, |
288 | MAX_PORTS); |
289 | xioctl(fd, SIOCDEVPRIVATE, &ifr); |
290 | for (i = 0; i < MAX_PORTS; i++) { |
291 | if (ifidx[i] == port) { |
292 | port = i; |
293 | break; |
294 | } |
295 | } |
296 | } |
297 | arg1 = port; |
298 | arg2 = xatoi_positive(*argv); |
299 | if (key == ARG_setbridgeprio) { |
300 | arg1 = arg2; |
301 | arg2 = 0; |
302 | } |
303 | arm_ioctl(args, ops[key - ARG_setpathcost], arg1, arg2); |
304 | } |
305 | fire: |
306 | /* Execute the previously set command */ |
307 | xioctl(fd, SIOCDEVPRIVATE, &ifr); |
308 | #endif |
309 | done_next_argv: |
310 | argv++; |
311 | done: |
312 | close(fd); |
313 | } |
314 | |
315 | return EXIT_SUCCESS; |
316 | } |
317 |