Contents of /tags/mkinitrd-6_2_3/busybox/networking/brctl.c
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Mon May 31 20:54:44 2010 UTC (14 years, 3 months ago) by niro
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Mon May 31 20:54:44 2010 UTC (14 years, 3 months ago) by niro
File MIME type: text/plain
File size: 7457 byte(s)
tagged 'mkinitrd-6_2_3'
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 tarball for details. |
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 | #include "libbb.h" |
16 | #include <linux/sockios.h> |
17 | #include <net/if.h> |
18 | |
19 | #ifndef SIOCBRADDBR |
20 | # define SIOCBRADDBR BRCTL_ADD_BRIDGE |
21 | #endif |
22 | #ifndef SIOCBRDELBR |
23 | # define SIOCBRDELBR BRCTL_DEL_BRIDGE |
24 | #endif |
25 | #ifndef SIOCBRADDIF |
26 | # define SIOCBRADDIF BRCTL_ADD_IF |
27 | #endif |
28 | #ifndef SIOCBRDELIF |
29 | # define SIOCBRDELIF BRCTL_DEL_IF |
30 | #endif |
31 | |
32 | |
33 | /* Maximum number of ports supported per bridge interface. */ |
34 | #ifndef MAX_PORTS |
35 | #define MAX_PORTS 32 |
36 | #endif |
37 | |
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 |
41 | |
42 | #if ENABLE_FEATURE_BRCTL_FANCY |
43 | #include <linux/if_bridge.h> |
44 | |
45 | /* FIXME: These 4 funcs are not really clean and could be improved */ |
46 | static ALWAYS_INLINE void strtotimeval(struct timeval *tv, |
47 | const char *time_str) |
48 | { |
49 | double secs; |
50 | #if BRCTL_USE_INTERNAL |
51 | secs = /*bb_*/strtod(time_str, NULL); |
52 | if (!secs) |
53 | #else |
54 | if (sscanf(time_str, "%lf", &secs) != 1) |
55 | #endif |
56 | bb_error_msg_and_die (bb_msg_invalid_arg, time_str, "timespec"); |
57 | tv->tv_sec = secs; |
58 | tv->tv_usec = 1000000 * (secs - tv->tv_sec); |
59 | } |
60 | |
61 | static ALWAYS_INLINE unsigned long __tv_to_jiffies(const struct timeval *tv) |
62 | { |
63 | unsigned long long jif; |
64 | |
65 | jif = 1000000ULL * tv->tv_sec + tv->tv_usec; |
66 | |
67 | return jif/10000; |
68 | } |
69 | # if 0 |
70 | static void __jiffies_to_tv(struct timeval *tv, unsigned long jiffies) |
71 | { |
72 | unsigned long long tvusec; |
73 | |
74 | tvusec = 10000ULL*jiffies; |
75 | tv->tv_sec = tvusec/1000000; |
76 | tv->tv_usec = tvusec - 1000000 * tv->tv_sec; |
77 | } |
78 | # endif |
79 | static unsigned long str_to_jiffies(const char *time_str) |
80 | { |
81 | struct timeval tv; |
82 | strtotimeval(&tv, time_str); |
83 | return __tv_to_jiffies(&tv); |
84 | } |
85 | |
86 | static void arm_ioctl(unsigned long *args, |
87 | unsigned long arg0, unsigned long arg1, unsigned long arg2) |
88 | { |
89 | args[0] = arg0; |
90 | args[1] = arg1; |
91 | args[2] = arg2; |
92 | args[3] = 0; |
93 | } |
94 | #endif |
95 | |
96 | |
97 | int brctl_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
98 | int brctl_main(int argc UNUSED_PARAM, char **argv) |
99 | { |
100 | static const char keywords[] ALIGN1 = |
101 | "addbr\0" "delbr\0" "addif\0" "delif\0" |
102 | IF_FEATURE_BRCTL_FANCY( |
103 | "stp\0" |
104 | "setageing\0" "setfd\0" "sethello\0" "setmaxage\0" |
105 | "setpathcost\0" "setportprio\0" "setbridgeprio\0" |
106 | ) |
107 | IF_FEATURE_BRCTL_SHOW("showmacs\0" "show\0"); |
108 | |
109 | enum { ARG_addbr = 0, ARG_delbr, ARG_addif, ARG_delif |
110 | IF_FEATURE_BRCTL_FANCY(, |
111 | ARG_stp, |
112 | ARG_setageing, ARG_setfd, ARG_sethello, ARG_setmaxage, |
113 | ARG_setpathcost, ARG_setportprio, ARG_setbridgeprio |
114 | ) |
115 | IF_FEATURE_BRCTL_SHOW(, ARG_showmacs, ARG_show) |
116 | }; |
117 | |
118 | int fd; |
119 | smallint key; |
120 | struct ifreq ifr; |
121 | char *br, *brif; |
122 | |
123 | argv++; |
124 | while (*argv) { |
125 | #if ENABLE_FEATURE_BRCTL_FANCY |
126 | int ifidx[MAX_PORTS]; |
127 | unsigned long args[4]; |
128 | ifr.ifr_data = (char *) &args; |
129 | #endif |
130 | |
131 | key = index_in_strings(keywords, *argv); |
132 | if (key == -1) /* no match found in keywords array, bail out. */ |
133 | bb_error_msg_and_die(bb_msg_invalid_arg, *argv, applet_name); |
134 | argv++; |
135 | fd = xsocket(AF_INET, SOCK_STREAM, 0); |
136 | |
137 | #if ENABLE_FEATURE_BRCTL_SHOW |
138 | if (key == ARG_show) { /* show */ |
139 | char brname[IFNAMSIZ]; |
140 | int bridx[MAX_PORTS]; |
141 | int i, num; |
142 | arm_ioctl(args, BRCTL_GET_BRIDGES, |
143 | (unsigned long) bridx, MAX_PORTS); |
144 | num = xioctl(fd, SIOCGIFBR, args); |
145 | printf("bridge name\tbridge id\t\tSTP enabled\tinterfaces\n"); |
146 | for (i = 0; i < num; i++) { |
147 | char ifname[IFNAMSIZ]; |
148 | int j, tabs; |
149 | struct __bridge_info bi; |
150 | unsigned char *x; |
151 | |
152 | if (!if_indextoname(bridx[i], brname)) |
153 | bb_perror_msg_and_die("can't get bridge name for index %d", i); |
154 | strncpy_IFNAMSIZ(ifr.ifr_name, brname); |
155 | |
156 | arm_ioctl(args, BRCTL_GET_BRIDGE_INFO, |
157 | (unsigned long) &bi, 0); |
158 | xioctl(fd, SIOCDEVPRIVATE, &ifr); |
159 | printf("%s\t\t", brname); |
160 | |
161 | /* print bridge id */ |
162 | x = (unsigned char *) &bi.bridge_id; |
163 | for (j = 0; j < 8; j++) { |
164 | printf("%.2x", x[j]); |
165 | if (j == 1) |
166 | bb_putchar('.'); |
167 | } |
168 | printf(bi.stp_enabled ? "\tyes" : "\tno"); |
169 | |
170 | /* print interface list */ |
171 | arm_ioctl(args, BRCTL_GET_PORT_LIST, |
172 | (unsigned long) ifidx, MAX_PORTS); |
173 | xioctl(fd, SIOCDEVPRIVATE, &ifr); |
174 | tabs = 0; |
175 | for (j = 0; j < MAX_PORTS; j++) { |
176 | if (!ifidx[j]) |
177 | continue; |
178 | if (!if_indextoname(ifidx[j], ifname)) |
179 | bb_perror_msg_and_die("can't get interface name for index %d", j); |
180 | if (tabs) |
181 | printf("\t\t\t\t\t"); |
182 | else |
183 | tabs = 1; |
184 | printf("\t\t%s\n", ifname); |
185 | } |
186 | if (!tabs) /* bridge has no interfaces */ |
187 | bb_putchar('\n'); |
188 | } |
189 | goto done; |
190 | } |
191 | #endif |
192 | |
193 | if (!*argv) /* all but 'show' need at least one argument */ |
194 | bb_show_usage(); |
195 | |
196 | br = *argv++; |
197 | |
198 | if (key == ARG_addbr || key == ARG_delbr) { /* addbr or delbr */ |
199 | ioctl_or_perror_and_die(fd, |
200 | key == ARG_addbr ? SIOCBRADDBR : SIOCBRDELBR, |
201 | br, "bridge %s", br); |
202 | goto done; |
203 | } |
204 | |
205 | if (!*argv) /* all but 'addif/delif' need at least two arguments */ |
206 | bb_show_usage(); |
207 | |
208 | strncpy_IFNAMSIZ(ifr.ifr_name, br); |
209 | if (key == ARG_addif || key == ARG_delif) { /* addif or delif */ |
210 | brif = *argv; |
211 | ifr.ifr_ifindex = if_nametoindex(brif); |
212 | if (!ifr.ifr_ifindex) { |
213 | bb_perror_msg_and_die("iface %s", brif); |
214 | } |
215 | ioctl_or_perror_and_die(fd, |
216 | key == ARG_addif ? SIOCBRADDIF : SIOCBRDELIF, |
217 | &ifr, "bridge %s", br); |
218 | goto done_next_argv; |
219 | } |
220 | #if ENABLE_FEATURE_BRCTL_FANCY |
221 | if (key == ARG_stp) { /* stp */ |
222 | /* FIXME: parsing yes/y/on/1 versus no/n/off/0 is too involved */ |
223 | arm_ioctl(args, BRCTL_SET_BRIDGE_STP_STATE, |
224 | (unsigned)(**argv - '0'), 0); |
225 | goto fire; |
226 | } |
227 | if ((unsigned)(key - ARG_setageing) < 4) { /* time related ops */ |
228 | static const uint8_t ops[] ALIGN1 = { |
229 | BRCTL_SET_AGEING_TIME, /* ARG_setageing */ |
230 | BRCTL_SET_BRIDGE_FORWARD_DELAY, /* ARG_setfd */ |
231 | BRCTL_SET_BRIDGE_HELLO_TIME, /* ARG_sethello */ |
232 | BRCTL_SET_BRIDGE_MAX_AGE /* ARG_setmaxage */ |
233 | }; |
234 | arm_ioctl(args, ops[key - ARG_setageing], str_to_jiffies(*argv), 0); |
235 | goto fire; |
236 | } |
237 | if (key == ARG_setpathcost |
238 | || key == ARG_setportprio |
239 | || key == ARG_setbridgeprio |
240 | ) { |
241 | static const uint8_t ops[] ALIGN1 = { |
242 | BRCTL_SET_PATH_COST, /* ARG_setpathcost */ |
243 | BRCTL_SET_PORT_PRIORITY, /* ARG_setportprio */ |
244 | BRCTL_SET_BRIDGE_PRIORITY /* ARG_setbridgeprio */ |
245 | }; |
246 | int port = -1; |
247 | unsigned arg1, arg2; |
248 | |
249 | if (key != ARG_setbridgeprio) { |
250 | /* get portnum */ |
251 | unsigned i; |
252 | |
253 | port = if_nametoindex(*argv++); |
254 | if (!port) |
255 | bb_error_msg_and_die(bb_msg_invalid_arg, *argv, "port"); |
256 | memset(ifidx, 0, sizeof ifidx); |
257 | arm_ioctl(args, BRCTL_GET_PORT_LIST, (unsigned long)ifidx, |
258 | MAX_PORTS); |
259 | xioctl(fd, SIOCDEVPRIVATE, &ifr); |
260 | for (i = 0; i < MAX_PORTS; i++) { |
261 | if (ifidx[i] == port) { |
262 | port = i; |
263 | break; |
264 | } |
265 | } |
266 | } |
267 | arg1 = port; |
268 | arg2 = xatoi_u(*argv); |
269 | if (key == ARG_setbridgeprio) { |
270 | arg1 = arg2; |
271 | arg2 = 0; |
272 | } |
273 | arm_ioctl(args, ops[key - ARG_setpathcost], arg1, arg2); |
274 | } |
275 | fire: |
276 | /* Execute the previously set command */ |
277 | xioctl(fd, SIOCDEVPRIVATE, &ifr); |
278 | #endif |
279 | done_next_argv: |
280 | argv++; |
281 | done: |
282 | close(fd); |
283 | } |
284 | |
285 | return EXIT_SUCCESS; |
286 | } |