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Commit | Line | Data |
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65018ae4 JHS |
1 | /* |
2 | * ctrl.c generic netlink controller | |
3 | * | |
4 | * This program is free software; you can distribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | * | |
80c05b09 JB |
9 | * Authors: J Hadi Salim (hadi@cyberus.ca) |
10 | * Johannes Berg (johannes@sipsolutions.net) | |
65018ae4 JHS |
11 | */ |
12 | ||
13 | #include <stdio.h> | |
14 | #include <stdlib.h> | |
15 | #include <unistd.h> | |
16 | #include <syslog.h> | |
17 | #include <fcntl.h> | |
18 | #include <sys/socket.h> | |
19 | #include <netinet/in.h> | |
20 | #include <arpa/inet.h> | |
21 | #include <string.h> | |
22 | ||
23 | #include "utils.h" | |
24 | #include "genl_utils.h" | |
25 | ||
26328fc3 | 26 | #define GENL_MAX_FAM_OPS 256 |
80c05b09 JB |
27 | #define GENL_MAX_FAM_GRPS 256 |
28 | ||
65018ae4 JHS |
29 | static int usage(void) |
30 | { | |
31 | fprintf(stderr,"Usage: ctrl <CMD>\n" \ | |
32 | "CMD := get <PARMS> | list | monitor\n" \ | |
33 | "PARMS := name <name> | id <id>\n" \ | |
34 | "Examples:\n" \ | |
35 | "\tctrl ls\n" \ | |
36 | "\tctrl monitor\n" \ | |
37 | "\tctrl get name foobar\n" \ | |
38 | "\tctrl get id 0xF\n"); | |
39 | return -1; | |
40 | } | |
41 | ||
42 | int genl_ctrl_resolve_family(const char *family) | |
43 | { | |
44 | struct rtnl_handle rth; | |
65018ae4 JHS |
45 | int ret = 0; |
46 | struct { | |
47 | struct nlmsghdr n; | |
d17b136f | 48 | struct genlmsghdr g; |
65018ae4 | 49 | char buf[4096]; |
d17b136f PS |
50 | } req = { |
51 | .n.nlmsg_len = NLMSG_LENGTH(GENL_HDRLEN), | |
52 | .n.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK, | |
53 | .n.nlmsg_type = GENL_ID_CTRL, | |
54 | .g.cmd = CTRL_CMD_GETFAMILY, | |
55 | }; | |
56 | struct nlmsghdr *nlh = &req.n; | |
57 | struct genlmsghdr *ghdr = &req.g; | |
65018ae4 JHS |
58 | |
59 | if (rtnl_open_byproto(&rth, 0, NETLINK_GENERIC) < 0) { | |
60 | fprintf(stderr, "Cannot open generic netlink socket\n"); | |
61 | exit(1); | |
62 | } | |
63 | ||
64 | addattr_l(nlh, 128, CTRL_ATTR_FAMILY_NAME, family, strlen(family) + 1); | |
65 | ||
c079e121 | 66 | if (rtnl_talk(&rth, nlh, nlh, sizeof(req)) < 0) { |
65018ae4 JHS |
67 | fprintf(stderr, "Error talking to the kernel\n"); |
68 | goto errout; | |
69 | } | |
70 | ||
71 | { | |
72 | struct rtattr *tb[CTRL_ATTR_MAX + 1]; | |
65018ae4 JHS |
73 | int len = nlh->nlmsg_len; |
74 | struct rtattr *attrs; | |
75 | ||
76 | if (nlh->nlmsg_type != GENL_ID_CTRL) { | |
77 | fprintf(stderr, "Not a controller message, nlmsg_len=%d " | |
78 | "nlmsg_type=0x%x\n", nlh->nlmsg_len, nlh->nlmsg_type); | |
79 | goto errout; | |
80 | } | |
81 | ||
82 | if (ghdr->cmd != CTRL_CMD_NEWFAMILY) { | |
80c05b09 | 83 | fprintf(stderr, "Unknown controller command %d\n", ghdr->cmd); |
65018ae4 JHS |
84 | goto errout; |
85 | } | |
86 | ||
87 | len -= NLMSG_LENGTH(GENL_HDRLEN); | |
88 | ||
89 | if (len < 0) { | |
90 | fprintf(stderr, "wrong controller message len %d\n", len); | |
91 | return -1; | |
92 | } | |
93 | ||
94 | attrs = (struct rtattr *) ((char *) ghdr + GENL_HDRLEN); | |
95 | parse_rtattr(tb, CTRL_ATTR_MAX, attrs, len); | |
96 | ||
97 | if (tb[CTRL_ATTR_FAMILY_ID] == NULL) { | |
98 | fprintf(stderr, "Missing family id TLV\n"); | |
99 | goto errout; | |
100 | } | |
101 | ||
ff24746c | 102 | ret = rta_getattr_u16(tb[CTRL_ATTR_FAMILY_ID]); |
65018ae4 JHS |
103 | } |
104 | ||
105 | errout: | |
106 | rtnl_close(&rth); | |
107 | return ret; | |
108 | } | |
109 | ||
d1f28cf1 | 110 | static void print_ctrl_cmd_flags(FILE *fp, __u32 fl) |
26328fc3 | 111 | { |
112 | fprintf(fp, "\n\t\tCapabilities (0x%x):\n ", fl); | |
113 | if (!fl) { | |
114 | fprintf(fp, "\n"); | |
115 | return; | |
116 | } | |
117 | fprintf(fp, "\t\t "); | |
118 | ||
119 | if (fl & GENL_ADMIN_PERM) | |
120 | fprintf(fp, " requires admin permission;"); | |
121 | if (fl & GENL_CMD_CAP_DO) | |
122 | fprintf(fp, " can doit;"); | |
123 | if (fl & GENL_CMD_CAP_DUMP) | |
124 | fprintf(fp, " can dumpit;"); | |
125 | if (fl & GENL_CMD_CAP_HASPOL) | |
126 | fprintf(fp, " has policy"); | |
127 | ||
128 | fprintf(fp, "\n"); | |
129 | } | |
e9e9365b | 130 | |
26328fc3 | 131 | static int print_ctrl_cmds(FILE *fp, struct rtattr *arg, __u32 ctrl_ver) |
132 | { | |
133 | struct rtattr *tb[CTRL_ATTR_OP_MAX + 1]; | |
134 | ||
135 | if (arg == NULL) | |
136 | return -1; | |
137 | ||
138 | parse_rtattr_nested(tb, CTRL_ATTR_OP_MAX, arg); | |
139 | if (tb[CTRL_ATTR_OP_ID]) { | |
140 | __u32 *id = RTA_DATA(tb[CTRL_ATTR_OP_ID]); | |
141 | fprintf(fp, " ID-0x%x ",*id); | |
142 | } | |
143 | /* we are only gonna do this for newer version of the controller */ | |
144 | if (tb[CTRL_ATTR_OP_FLAGS] && ctrl_ver >= 0x2) { | |
145 | __u32 *fl = RTA_DATA(tb[CTRL_ATTR_OP_FLAGS]); | |
146 | print_ctrl_cmd_flags(fp, *fl); | |
147 | } | |
148 | return 0; | |
149 | ||
150 | } | |
151 | ||
80c05b09 JB |
152 | static int print_ctrl_grp(FILE *fp, struct rtattr *arg, __u32 ctrl_ver) |
153 | { | |
154 | struct rtattr *tb[CTRL_ATTR_MCAST_GRP_MAX + 1]; | |
155 | ||
156 | if (arg == NULL) | |
157 | return -1; | |
158 | ||
159 | parse_rtattr_nested(tb, CTRL_ATTR_MCAST_GRP_MAX, arg); | |
160 | if (tb[2]) { | |
161 | __u32 *id = RTA_DATA(tb[CTRL_ATTR_MCAST_GRP_ID]); | |
162 | fprintf(fp, " ID-0x%x ",*id); | |
163 | } | |
164 | if (tb[1]) { | |
165 | char *name = RTA_DATA(tb[CTRL_ATTR_MCAST_GRP_NAME]); | |
166 | fprintf(fp, " name: %s ", name); | |
167 | } | |
168 | return 0; | |
169 | ||
170 | } | |
171 | ||
26328fc3 | 172 | /* |
173 | * The controller sends one nlmsg per family | |
174 | */ | |
0628cddd ND |
175 | static int print_ctrl(const struct sockaddr_nl *who, |
176 | struct rtnl_ctrl_data *ctrl, | |
177 | struct nlmsghdr *n, void *arg) | |
65018ae4 JHS |
178 | { |
179 | struct rtattr *tb[CTRL_ATTR_MAX + 1]; | |
180 | struct genlmsghdr *ghdr = NLMSG_DATA(n); | |
181 | int len = n->nlmsg_len; | |
182 | struct rtattr *attrs; | |
183 | FILE *fp = (FILE *) arg; | |
81c61790 | 184 | __u32 ctrl_v = 0x1; |
65018ae4 JHS |
185 | |
186 | if (n->nlmsg_type != GENL_ID_CTRL) { | |
187 | fprintf(stderr, "Not a controller message, nlmsg_len=%d " | |
188 | "nlmsg_type=0x%x\n", n->nlmsg_len, n->nlmsg_type); | |
189 | return 0; | |
190 | } | |
191 | ||
192 | if (ghdr->cmd != CTRL_CMD_GETFAMILY && | |
193 | ghdr->cmd != CTRL_CMD_DELFAMILY && | |
80c05b09 JB |
194 | ghdr->cmd != CTRL_CMD_NEWFAMILY && |
195 | ghdr->cmd != CTRL_CMD_NEWMCAST_GRP && | |
196 | ghdr->cmd != CTRL_CMD_DELMCAST_GRP) { | |
197 | fprintf(stderr, "Unknown controller command %d\n", ghdr->cmd); | |
65018ae4 JHS |
198 | return 0; |
199 | } | |
200 | ||
201 | len -= NLMSG_LENGTH(GENL_HDRLEN); | |
202 | ||
203 | if (len < 0) { | |
204 | fprintf(stderr, "wrong controller message len %d\n", len); | |
205 | return -1; | |
206 | } | |
207 | ||
208 | attrs = (struct rtattr *) ((char *) ghdr + GENL_HDRLEN); | |
209 | parse_rtattr(tb, CTRL_ATTR_MAX, attrs, len); | |
210 | ||
211 | if (tb[CTRL_ATTR_FAMILY_NAME]) { | |
212 | char *name = RTA_DATA(tb[CTRL_ATTR_FAMILY_NAME]); | |
26328fc3 | 213 | fprintf(fp, "\nName: %s\n",name); |
65018ae4 JHS |
214 | } |
215 | if (tb[CTRL_ATTR_FAMILY_ID]) { | |
216 | __u16 *id = RTA_DATA(tb[CTRL_ATTR_FAMILY_ID]); | |
26328fc3 | 217 | fprintf(fp, "\tID: 0x%x ",*id); |
218 | } | |
219 | if (tb[CTRL_ATTR_VERSION]) { | |
220 | __u32 *v = RTA_DATA(tb[CTRL_ATTR_VERSION]); | |
221 | fprintf(fp, " Version: 0x%x ",*v); | |
222 | ctrl_v = *v; | |
65018ae4 | 223 | } |
26328fc3 | 224 | if (tb[CTRL_ATTR_HDRSIZE]) { |
225 | __u32 *h = RTA_DATA(tb[CTRL_ATTR_HDRSIZE]); | |
226 | fprintf(fp, " header size: %d ",*h); | |
227 | } | |
228 | if (tb[CTRL_ATTR_MAXATTR]) { | |
229 | __u32 *ma = RTA_DATA(tb[CTRL_ATTR_MAXATTR]); | |
230 | fprintf(fp, " max attribs: %d ",*ma); | |
231 | } | |
232 | /* end of family definitions .. */ | |
233 | fprintf(fp,"\n"); | |
234 | if (tb[CTRL_ATTR_OPS]) { | |
235 | struct rtattr *tb2[GENL_MAX_FAM_OPS]; | |
236 | int i=0; | |
237 | parse_rtattr_nested(tb2, GENL_MAX_FAM_OPS, tb[CTRL_ATTR_OPS]); | |
238 | fprintf(fp, "\tcommands supported: \n"); | |
239 | for (i = 0; i < GENL_MAX_FAM_OPS; i++) { | |
240 | if (tb2[i]) { | |
241 | fprintf(fp, "\t\t#%d: ", i); | |
242 | if (0 > print_ctrl_cmds(fp, tb2[i], ctrl_v)) { | |
243 | fprintf(fp, "Error printing command\n"); | |
244 | } | |
245 | /* for next command */ | |
246 | fprintf(fp,"\n"); | |
247 | } | |
248 | } | |
65018ae4 | 249 | |
26328fc3 | 250 | /* end of family::cmds definitions .. */ |
251 | fprintf(fp,"\n"); | |
252 | } | |
80c05b09 JB |
253 | |
254 | if (tb[CTRL_ATTR_MCAST_GROUPS]) { | |
255 | struct rtattr *tb2[GENL_MAX_FAM_GRPS + 1]; | |
256 | int i; | |
257 | ||
258 | parse_rtattr_nested(tb2, GENL_MAX_FAM_GRPS, | |
259 | tb[CTRL_ATTR_MCAST_GROUPS]); | |
260 | fprintf(fp, "\tmulticast groups:\n"); | |
261 | ||
262 | for (i = 0; i < GENL_MAX_FAM_GRPS; i++) { | |
263 | if (tb2[i]) { | |
264 | fprintf(fp, "\t\t#%d: ", i); | |
265 | if (0 > print_ctrl_grp(fp, tb2[i], ctrl_v)) | |
266 | fprintf(fp, "Error printing group\n"); | |
267 | /* for next group */ | |
268 | fprintf(fp,"\n"); | |
269 | } | |
270 | } | |
271 | ||
272 | /* end of family::groups definitions .. */ | |
273 | fprintf(fp,"\n"); | |
274 | } | |
275 | ||
65018ae4 JHS |
276 | fflush(fp); |
277 | return 0; | |
278 | } | |
279 | ||
0628cddd ND |
280 | static int print_ctrl2(const struct sockaddr_nl *who, |
281 | struct nlmsghdr *n, void *arg) | |
282 | { | |
283 | return print_ctrl(who, NULL, n, arg); | |
284 | } | |
285 | ||
65018ae4 JHS |
286 | static int ctrl_list(int cmd, int argc, char **argv) |
287 | { | |
288 | struct rtnl_handle rth; | |
65018ae4 JHS |
289 | int ret = -1; |
290 | char d[GENL_NAMSIZ]; | |
291 | struct { | |
292 | struct nlmsghdr n; | |
d17b136f | 293 | struct genlmsghdr g; |
65018ae4 | 294 | char buf[4096]; |
d17b136f PS |
295 | } req = { |
296 | .n.nlmsg_len = NLMSG_LENGTH(GENL_HDRLEN), | |
297 | .n.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK, | |
298 | .n.nlmsg_type = GENL_ID_CTRL, | |
299 | .g.cmd = CTRL_CMD_GETFAMILY, | |
300 | }; | |
301 | struct nlmsghdr *nlh = &req.n; | |
65018ae4 JHS |
302 | |
303 | if (rtnl_open_byproto(&rth, 0, NETLINK_GENERIC) < 0) { | |
304 | fprintf(stderr, "Cannot open generic netlink socket\n"); | |
305 | exit(1); | |
306 | } | |
307 | ||
308 | if (cmd == CTRL_CMD_GETFAMILY) { | |
309 | if (argc != 2) { | |
310 | fprintf(stderr, "Wrong number of params\n"); | |
311 | return -1; | |
312 | } | |
313 | ||
314 | if (matches(*argv, "name") == 0) { | |
315 | NEXT_ARG(); | |
316 | strncpy(d, *argv, sizeof (d) - 1); | |
317 | addattr_l(nlh, 128, CTRL_ATTR_FAMILY_NAME, | |
318 | d, strlen(d) + 1); | |
319 | } else if (matches(*argv, "id") == 0) { | |
320 | __u16 id; | |
321 | NEXT_ARG(); | |
322 | if (get_u16(&id, *argv, 0)) { | |
323 | fprintf(stderr, "Illegal \"id\"\n"); | |
324 | goto ctrl_done; | |
325 | } | |
326 | ||
327 | addattr_l(nlh, 128, CTRL_ATTR_FAMILY_ID, &id, 2); | |
328 | ||
329 | } else { | |
330 | fprintf(stderr, "Wrong params\n"); | |
331 | goto ctrl_done; | |
332 | } | |
333 | ||
c079e121 | 334 | if (rtnl_talk(&rth, nlh, nlh, sizeof(req)) < 0) { |
65018ae4 JHS |
335 | fprintf(stderr, "Error talking to the kernel\n"); |
336 | goto ctrl_done; | |
337 | } | |
338 | ||
0628cddd | 339 | if (print_ctrl2(NULL, nlh, (void *) stdout) < 0) { |
65018ae4 JHS |
340 | fprintf(stderr, "Dump terminated\n"); |
341 | goto ctrl_done; | |
342 | } | |
343 | ||
344 | } | |
345 | ||
346 | if (cmd == CTRL_CMD_UNSPEC) { | |
347 | nlh->nlmsg_flags = NLM_F_ROOT|NLM_F_MATCH|NLM_F_REQUEST; | |
348 | nlh->nlmsg_seq = rth.dump = ++rth.seq; | |
349 | ||
6cf8398f | 350 | if (rtnl_send(&rth, nlh, nlh->nlmsg_len) < 0) { |
65018ae4 JHS |
351 | perror("Failed to send dump request\n"); |
352 | goto ctrl_done; | |
353 | } | |
354 | ||
0628cddd | 355 | rtnl_dump_filter(&rth, print_ctrl2, stdout); |
65018ae4 JHS |
356 | |
357 | } | |
358 | ||
359 | ret = 0; | |
360 | ctrl_done: | |
361 | rtnl_close(&rth); | |
362 | return ret; | |
363 | } | |
364 | ||
365 | static int ctrl_listen(int argc, char **argv) | |
366 | { | |
367 | struct rtnl_handle rth; | |
368 | ||
369 | if (rtnl_open_byproto(&rth, nl_mgrp(GENL_ID_CTRL), NETLINK_GENERIC) < 0) { | |
370 | fprintf(stderr, "Canot open generic netlink socket\n"); | |
371 | return -1; | |
372 | } | |
373 | ||
374 | if (rtnl_listen(&rth, print_ctrl, (void *) stdout) < 0) | |
375 | return -1; | |
376 | ||
377 | return 0; | |
378 | } | |
379 | ||
380 | static int parse_ctrl(struct genl_util *a, int argc, char **argv) | |
381 | { | |
382 | argv++; | |
383 | if (--argc <= 0) { | |
384 | fprintf(stderr, "wrong controller params\n"); | |
385 | return -1; | |
386 | } | |
387 | ||
388 | if (matches(*argv, "monitor") == 0) | |
389 | return ctrl_listen(argc-1, argv+1); | |
390 | if (matches(*argv, "get") == 0) | |
391 | return ctrl_list(CTRL_CMD_GETFAMILY, argc-1, argv+1); | |
392 | if (matches(*argv, "list") == 0 || | |
393 | matches(*argv, "show") == 0 || | |
394 | matches(*argv, "lst") == 0) | |
395 | return ctrl_list(CTRL_CMD_UNSPEC, argc-1, argv+1); | |
396 | if (matches(*argv, "help") == 0) | |
397 | return usage(); | |
398 | ||
3669d218 | 399 | fprintf(stderr, "ctrl command \"%s\" is unknown, try \"ctrl help\".\n", |
65018ae4 JHS |
400 | *argv); |
401 | ||
402 | return -1; | |
403 | } | |
404 | ||
405 | struct genl_util ctrl_genl_util = { | |
406 | .name = "ctrl", | |
407 | .parse_genlopt = parse_ctrl, | |
0628cddd | 408 | .print_genlopt = print_ctrl2, |
65018ae4 | 409 | }; |