Contents of /tags/mkinitrd-6_1_3/busybox/networking/brctl.c
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Mon May 4 18:51:23 2009 UTC (15 years, 4 months ago) by niro
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File size: 7209 byte(s)
Mon May 4 18:51:23 2009 UTC (15 years, 4 months ago) by niro
File MIME type: text/plain
File size: 7209 byte(s)
tagged 'mkinitrd-6_1_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 | /* Maximum number of ports supported per bridge interface. */ |
20 | #ifndef MAX_PORTS |
21 | #define MAX_PORTS 32 |
22 | #endif |
23 | |
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 |
27 | |
28 | #if ENABLE_FEATURE_BRCTL_FANCY |
29 | #include <linux/if_bridge.h> |
30 | |
31 | /* FIXME: These 4 funcs are not really clean and could be improved */ |
32 | static ALWAYS_INLINE void strtotimeval(struct timeval *tv, |
33 | const char *time_str) |
34 | { |
35 | double secs; |
36 | #if BRCTL_USE_INTERNAL |
37 | secs = /*bb_*/strtod(time_str, NULL); |
38 | if (!secs) |
39 | #else |
40 | if (sscanf(time_str, "%lf", &secs) != 1) |
41 | #endif |
42 | bb_error_msg_and_die (bb_msg_invalid_arg, time_str, "timespec"); |
43 | tv->tv_sec = secs; |
44 | tv->tv_usec = 1000000 * (secs - tv->tv_sec); |
45 | } |
46 | |
47 | static ALWAYS_INLINE unsigned long __tv_to_jiffies(const struct timeval *tv) |
48 | { |
49 | unsigned long long jif; |
50 | |
51 | jif = 1000000ULL * tv->tv_sec + tv->tv_usec; |
52 | |
53 | return jif/10000; |
54 | } |
55 | # if 0 |
56 | static void __jiffies_to_tv(struct timeval *tv, unsigned long jiffies) |
57 | { |
58 | unsigned long long tvusec; |
59 | |
60 | tvusec = 10000ULL*jiffies; |
61 | tv->tv_sec = tvusec/1000000; |
62 | tv->tv_usec = tvusec - 1000000 * tv->tv_sec; |
63 | } |
64 | # endif |
65 | static unsigned long str_to_jiffies(const char *time_str) |
66 | { |
67 | struct timeval tv; |
68 | strtotimeval(&tv, time_str); |
69 | return __tv_to_jiffies(&tv); |
70 | } |
71 | |
72 | static void arm_ioctl(unsigned long *args, |
73 | unsigned long arg0, unsigned long arg1, unsigned long arg2) |
74 | { |
75 | args[0] = arg0; |
76 | args[1] = arg1; |
77 | args[2] = arg2; |
78 | args[3] = 0; |
79 | } |
80 | #endif |
81 | |
82 | |
83 | int brctl_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
84 | int brctl_main(int argc UNUSED_PARAM, char **argv) |
85 | { |
86 | static const char keywords[] ALIGN1 = |
87 | "addbr\0" "delbr\0" "addif\0" "delif\0" |
88 | USE_FEATURE_BRCTL_FANCY( |
89 | "stp\0" |
90 | "setageing\0" "setfd\0" "sethello\0" "setmaxage\0" |
91 | "setpathcost\0" "setportprio\0" "setbridgeprio\0" |
92 | ) |
93 | USE_FEATURE_BRCTL_SHOW("showmacs\0" "show\0"); |
94 | |
95 | enum { ARG_addbr = 0, ARG_delbr, ARG_addif, ARG_delif |
96 | USE_FEATURE_BRCTL_FANCY(, |
97 | ARG_stp, |
98 | ARG_setageing, ARG_setfd, ARG_sethello, ARG_setmaxage, |
99 | ARG_setpathcost, ARG_setportprio, ARG_setbridgeprio |
100 | ) |
101 | USE_FEATURE_BRCTL_SHOW(, ARG_showmacs, ARG_show) |
102 | }; |
103 | |
104 | int fd; |
105 | smallint key; |
106 | struct ifreq ifr; |
107 | char *br, *brif; |
108 | |
109 | argv++; |
110 | while (*argv) { |
111 | #if ENABLE_FEATURE_BRCTL_FANCY |
112 | int ifidx[MAX_PORTS]; |
113 | unsigned long args[4]; |
114 | ifr.ifr_data = (char *) &args; |
115 | #endif |
116 | |
117 | key = index_in_strings(keywords, *argv); |
118 | if (key == -1) /* no match found in keywords array, bail out. */ |
119 | bb_error_msg_and_die(bb_msg_invalid_arg, *argv, applet_name); |
120 | argv++; |
121 | fd = xsocket(AF_INET, SOCK_STREAM, 0); |
122 | |
123 | #if ENABLE_FEATURE_BRCTL_SHOW |
124 | if (key == ARG_show) { /* show */ |
125 | char brname[IFNAMSIZ]; |
126 | int bridx[MAX_PORTS]; |
127 | int i, num; |
128 | arm_ioctl(args, BRCTL_GET_BRIDGES, |
129 | (unsigned long) bridx, MAX_PORTS); |
130 | num = xioctl(fd, SIOCGIFBR, args); |
131 | printf("bridge name\tbridge id\t\tSTP enabled\tinterfaces\n"); |
132 | for (i = 0; i < num; i++) { |
133 | char ifname[IFNAMSIZ]; |
134 | int j, tabs; |
135 | struct __bridge_info bi; |
136 | unsigned char *x; |
137 | |
138 | if (!if_indextoname(bridx[i], brname)) |
139 | bb_perror_msg_and_die("can't get bridge name for index %d", i); |
140 | strncpy(ifr.ifr_name, brname, IFNAMSIZ); |
141 | |
142 | arm_ioctl(args, BRCTL_GET_BRIDGE_INFO, |
143 | (unsigned long) &bi, 0); |
144 | xioctl(fd, SIOCDEVPRIVATE, &ifr); |
145 | printf("%s\t\t", brname); |
146 | |
147 | /* print bridge id */ |
148 | x = (unsigned char *) &bi.bridge_id; |
149 | for (j = 0; j < 8; j++) { |
150 | printf("%.2x", x[j]); |
151 | if (j == 1) |
152 | bb_putchar('.'); |
153 | } |
154 | printf(bi.stp_enabled ? "\tyes" : "\tno"); |
155 | |
156 | /* print interface list */ |
157 | arm_ioctl(args, BRCTL_GET_PORT_LIST, |
158 | (unsigned long) ifidx, MAX_PORTS); |
159 | xioctl(fd, SIOCDEVPRIVATE, &ifr); |
160 | tabs = 0; |
161 | for (j = 0; j < MAX_PORTS; j++) { |
162 | if (!ifidx[j]) |
163 | continue; |
164 | if (!if_indextoname(ifidx[j], ifname)) |
165 | bb_perror_msg_and_die("can't get interface name for index %d", j); |
166 | if (tabs) |
167 | printf("\t\t\t\t\t"); |
168 | else |
169 | tabs = 1; |
170 | printf("\t\t%s\n", ifname); |
171 | } |
172 | if (!tabs) /* bridge has no interfaces */ |
173 | bb_putchar('\n'); |
174 | } |
175 | goto done; |
176 | } |
177 | #endif |
178 | |
179 | if (!*argv) /* all but 'show' need at least one argument */ |
180 | bb_show_usage(); |
181 | |
182 | br = *argv++; |
183 | |
184 | if (key == ARG_addbr || key == ARG_delbr) { /* addbr or delbr */ |
185 | ioctl_or_perror_and_die(fd, |
186 | key == ARG_addbr ? SIOCBRADDBR : SIOCBRDELBR, |
187 | br, "bridge %s", br); |
188 | goto done; |
189 | } |
190 | |
191 | if (!*argv) /* all but 'addif/delif' need at least two arguments */ |
192 | bb_show_usage(); |
193 | |
194 | strncpy(ifr.ifr_name, br, IFNAMSIZ); |
195 | if (key == ARG_addif || key == ARG_delif) { /* addif or delif */ |
196 | brif = *argv; |
197 | ifr.ifr_ifindex = if_nametoindex(brif); |
198 | if (!ifr.ifr_ifindex) { |
199 | bb_perror_msg_and_die("iface %s", brif); |
200 | } |
201 | ioctl_or_perror_and_die(fd, |
202 | key == ARG_addif ? SIOCBRADDIF : SIOCBRDELIF, |
203 | &ifr, "bridge %s", br); |
204 | goto done_next_argv; |
205 | } |
206 | #if ENABLE_FEATURE_BRCTL_FANCY |
207 | if (key == ARG_stp) { /* stp */ |
208 | /* FIXME: parsing yes/y/on/1 versus no/n/off/0 is too involved */ |
209 | arm_ioctl(args, BRCTL_SET_BRIDGE_STP_STATE, |
210 | (unsigned)(**argv - '0'), 0); |
211 | goto fire; |
212 | } |
213 | if ((unsigned)(key - ARG_setageing) < 4) { /* time related ops */ |
214 | static const uint8_t ops[] ALIGN1 = { |
215 | BRCTL_SET_AGEING_TIME, /* ARG_setageing */ |
216 | BRCTL_SET_BRIDGE_FORWARD_DELAY, /* ARG_setfd */ |
217 | BRCTL_SET_BRIDGE_HELLO_TIME, /* ARG_sethello */ |
218 | BRCTL_SET_BRIDGE_MAX_AGE /* ARG_setmaxage */ |
219 | }; |
220 | arm_ioctl(args, ops[key - ARG_setageing], str_to_jiffies(*argv), 0); |
221 | goto fire; |
222 | } |
223 | if (key == ARG_setpathcost |
224 | || key == ARG_setportprio |
225 | || key == ARG_setbridgeprio |
226 | ) { |
227 | static const uint8_t ops[] ALIGN1 = { |
228 | BRCTL_SET_PATH_COST, /* ARG_setpathcost */ |
229 | BRCTL_SET_PORT_PRIORITY, /* ARG_setportprio */ |
230 | BRCTL_SET_BRIDGE_PRIORITY /* ARG_setbridgeprio */ |
231 | }; |
232 | int port = -1; |
233 | unsigned arg1, arg2; |
234 | |
235 | if (key != ARG_setbridgeprio) { |
236 | /* get portnum */ |
237 | unsigned i; |
238 | |
239 | port = if_nametoindex(*argv++); |
240 | if (!port) |
241 | bb_error_msg_and_die(bb_msg_invalid_arg, *argv, "port"); |
242 | memset(ifidx, 0, sizeof ifidx); |
243 | arm_ioctl(args, BRCTL_GET_PORT_LIST, (unsigned long)ifidx, |
244 | MAX_PORTS); |
245 | xioctl(fd, SIOCDEVPRIVATE, &ifr); |
246 | for (i = 0; i < MAX_PORTS; i++) { |
247 | if (ifidx[i] == port) { |
248 | port = i; |
249 | break; |
250 | } |
251 | } |
252 | } |
253 | arg1 = port; |
254 | arg2 = xatoi_u(*argv); |
255 | if (key == ARG_setbridgeprio) { |
256 | arg1 = arg2; |
257 | arg2 = 0; |
258 | } |
259 | arm_ioctl(args, ops[key - ARG_setpathcost], arg1, arg2); |
260 | } |
261 | fire: |
262 | /* Execute the previously set command */ |
263 | xioctl(fd, SIOCDEVPRIVATE, &ifr); |
264 | #endif |
265 | done_next_argv: |
266 | argv++; |
267 | done: |
268 | close(fd); |
269 | } |
270 | |
271 | return EXIT_SUCCESS; |
272 | } |