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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; | |
45 | struct nlmsghdr *nlh; | |
46 | struct genlmsghdr *ghdr; | |
47 | int ret = 0; | |
48 | struct { | |
49 | struct nlmsghdr n; | |
50 | char buf[4096]; | |
51 | } req; | |
52 | ||
53 | memset(&req, 0, sizeof(req)); | |
54 | ||
55 | nlh = &req.n; | |
56 | nlh->nlmsg_len = NLMSG_LENGTH(GENL_HDRLEN); | |
57 | nlh->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK; | |
58 | nlh->nlmsg_type = GENL_ID_CTRL; | |
59 | ||
60 | ghdr = NLMSG_DATA(&req.n); | |
61 | ghdr->cmd = CTRL_CMD_GETFAMILY; | |
62 | ||
63 | if (rtnl_open_byproto(&rth, 0, NETLINK_GENERIC) < 0) { | |
64 | fprintf(stderr, "Cannot open generic netlink socket\n"); | |
65 | exit(1); | |
66 | } | |
67 | ||
68 | addattr_l(nlh, 128, CTRL_ATTR_FAMILY_NAME, family, strlen(family) + 1); | |
69 | ||
cd70f3f5 | 70 | if (rtnl_talk(&rth, nlh, 0, 0, nlh) < 0) { |
65018ae4 JHS |
71 | fprintf(stderr, "Error talking to the kernel\n"); |
72 | goto errout; | |
73 | } | |
74 | ||
75 | { | |
76 | struct rtattr *tb[CTRL_ATTR_MAX + 1]; | |
77 | struct genlmsghdr *ghdr = NLMSG_DATA(nlh); | |
78 | int len = nlh->nlmsg_len; | |
79 | struct rtattr *attrs; | |
80 | ||
81 | if (nlh->nlmsg_type != GENL_ID_CTRL) { | |
82 | fprintf(stderr, "Not a controller message, nlmsg_len=%d " | |
83 | "nlmsg_type=0x%x\n", nlh->nlmsg_len, nlh->nlmsg_type); | |
84 | goto errout; | |
85 | } | |
86 | ||
87 | if (ghdr->cmd != CTRL_CMD_NEWFAMILY) { | |
80c05b09 | 88 | fprintf(stderr, "Unknown controller command %d\n", ghdr->cmd); |
65018ae4 JHS |
89 | goto errout; |
90 | } | |
91 | ||
92 | len -= NLMSG_LENGTH(GENL_HDRLEN); | |
93 | ||
94 | if (len < 0) { | |
95 | fprintf(stderr, "wrong controller message len %d\n", len); | |
96 | return -1; | |
97 | } | |
98 | ||
99 | attrs = (struct rtattr *) ((char *) ghdr + GENL_HDRLEN); | |
100 | parse_rtattr(tb, CTRL_ATTR_MAX, attrs, len); | |
101 | ||
102 | if (tb[CTRL_ATTR_FAMILY_ID] == NULL) { | |
103 | fprintf(stderr, "Missing family id TLV\n"); | |
104 | goto errout; | |
105 | } | |
106 | ||
ff24746c | 107 | ret = rta_getattr_u16(tb[CTRL_ATTR_FAMILY_ID]); |
65018ae4 JHS |
108 | } |
109 | ||
110 | errout: | |
111 | rtnl_close(&rth); | |
112 | return ret; | |
113 | } | |
114 | ||
d1f28cf1 | 115 | static void print_ctrl_cmd_flags(FILE *fp, __u32 fl) |
26328fc3 | 116 | { |
117 | fprintf(fp, "\n\t\tCapabilities (0x%x):\n ", fl); | |
118 | if (!fl) { | |
119 | fprintf(fp, "\n"); | |
120 | return; | |
121 | } | |
122 | fprintf(fp, "\t\t "); | |
123 | ||
124 | if (fl & GENL_ADMIN_PERM) | |
125 | fprintf(fp, " requires admin permission;"); | |
126 | if (fl & GENL_CMD_CAP_DO) | |
127 | fprintf(fp, " can doit;"); | |
128 | if (fl & GENL_CMD_CAP_DUMP) | |
129 | fprintf(fp, " can dumpit;"); | |
130 | if (fl & GENL_CMD_CAP_HASPOL) | |
131 | fprintf(fp, " has policy"); | |
132 | ||
133 | fprintf(fp, "\n"); | |
134 | } | |
135 | ||
136 | static int print_ctrl_cmds(FILE *fp, struct rtattr *arg, __u32 ctrl_ver) | |
137 | { | |
138 | struct rtattr *tb[CTRL_ATTR_OP_MAX + 1]; | |
139 | ||
140 | if (arg == NULL) | |
141 | return -1; | |
142 | ||
143 | parse_rtattr_nested(tb, CTRL_ATTR_OP_MAX, arg); | |
144 | if (tb[CTRL_ATTR_OP_ID]) { | |
145 | __u32 *id = RTA_DATA(tb[CTRL_ATTR_OP_ID]); | |
146 | fprintf(fp, " ID-0x%x ",*id); | |
147 | } | |
148 | /* we are only gonna do this for newer version of the controller */ | |
149 | if (tb[CTRL_ATTR_OP_FLAGS] && ctrl_ver >= 0x2) { | |
150 | __u32 *fl = RTA_DATA(tb[CTRL_ATTR_OP_FLAGS]); | |
151 | print_ctrl_cmd_flags(fp, *fl); | |
152 | } | |
153 | return 0; | |
154 | ||
155 | } | |
156 | ||
80c05b09 JB |
157 | static int print_ctrl_grp(FILE *fp, struct rtattr *arg, __u32 ctrl_ver) |
158 | { | |
159 | struct rtattr *tb[CTRL_ATTR_MCAST_GRP_MAX + 1]; | |
160 | ||
161 | if (arg == NULL) | |
162 | return -1; | |
163 | ||
164 | parse_rtattr_nested(tb, CTRL_ATTR_MCAST_GRP_MAX, arg); | |
165 | if (tb[2]) { | |
166 | __u32 *id = RTA_DATA(tb[CTRL_ATTR_MCAST_GRP_ID]); | |
167 | fprintf(fp, " ID-0x%x ",*id); | |
168 | } | |
169 | if (tb[1]) { | |
170 | char *name = RTA_DATA(tb[CTRL_ATTR_MCAST_GRP_NAME]); | |
171 | fprintf(fp, " name: %s ", name); | |
172 | } | |
173 | return 0; | |
174 | ||
175 | } | |
176 | ||
26328fc3 | 177 | /* |
178 | * The controller sends one nlmsg per family | |
179 | */ | |
0628cddd ND |
180 | static int print_ctrl(const struct sockaddr_nl *who, |
181 | struct rtnl_ctrl_data *ctrl, | |
182 | struct nlmsghdr *n, void *arg) | |
65018ae4 JHS |
183 | { |
184 | struct rtattr *tb[CTRL_ATTR_MAX + 1]; | |
185 | struct genlmsghdr *ghdr = NLMSG_DATA(n); | |
186 | int len = n->nlmsg_len; | |
187 | struct rtattr *attrs; | |
188 | FILE *fp = (FILE *) arg; | |
81c61790 | 189 | __u32 ctrl_v = 0x1; |
65018ae4 JHS |
190 | |
191 | if (n->nlmsg_type != GENL_ID_CTRL) { | |
192 | fprintf(stderr, "Not a controller message, nlmsg_len=%d " | |
193 | "nlmsg_type=0x%x\n", n->nlmsg_len, n->nlmsg_type); | |
194 | return 0; | |
195 | } | |
196 | ||
197 | if (ghdr->cmd != CTRL_CMD_GETFAMILY && | |
198 | ghdr->cmd != CTRL_CMD_DELFAMILY && | |
80c05b09 JB |
199 | ghdr->cmd != CTRL_CMD_NEWFAMILY && |
200 | ghdr->cmd != CTRL_CMD_NEWMCAST_GRP && | |
201 | ghdr->cmd != CTRL_CMD_DELMCAST_GRP) { | |
202 | fprintf(stderr, "Unknown controller command %d\n", ghdr->cmd); | |
65018ae4 JHS |
203 | return 0; |
204 | } | |
205 | ||
206 | len -= NLMSG_LENGTH(GENL_HDRLEN); | |
207 | ||
208 | if (len < 0) { | |
209 | fprintf(stderr, "wrong controller message len %d\n", len); | |
210 | return -1; | |
211 | } | |
212 | ||
213 | attrs = (struct rtattr *) ((char *) ghdr + GENL_HDRLEN); | |
214 | parse_rtattr(tb, CTRL_ATTR_MAX, attrs, len); | |
215 | ||
216 | if (tb[CTRL_ATTR_FAMILY_NAME]) { | |
217 | char *name = RTA_DATA(tb[CTRL_ATTR_FAMILY_NAME]); | |
26328fc3 | 218 | fprintf(fp, "\nName: %s\n",name); |
65018ae4 JHS |
219 | } |
220 | if (tb[CTRL_ATTR_FAMILY_ID]) { | |
221 | __u16 *id = RTA_DATA(tb[CTRL_ATTR_FAMILY_ID]); | |
26328fc3 | 222 | fprintf(fp, "\tID: 0x%x ",*id); |
223 | } | |
224 | if (tb[CTRL_ATTR_VERSION]) { | |
225 | __u32 *v = RTA_DATA(tb[CTRL_ATTR_VERSION]); | |
226 | fprintf(fp, " Version: 0x%x ",*v); | |
227 | ctrl_v = *v; | |
65018ae4 | 228 | } |
26328fc3 | 229 | if (tb[CTRL_ATTR_HDRSIZE]) { |
230 | __u32 *h = RTA_DATA(tb[CTRL_ATTR_HDRSIZE]); | |
231 | fprintf(fp, " header size: %d ",*h); | |
232 | } | |
233 | if (tb[CTRL_ATTR_MAXATTR]) { | |
234 | __u32 *ma = RTA_DATA(tb[CTRL_ATTR_MAXATTR]); | |
235 | fprintf(fp, " max attribs: %d ",*ma); | |
236 | } | |
237 | /* end of family definitions .. */ | |
238 | fprintf(fp,"\n"); | |
239 | if (tb[CTRL_ATTR_OPS]) { | |
240 | struct rtattr *tb2[GENL_MAX_FAM_OPS]; | |
241 | int i=0; | |
242 | parse_rtattr_nested(tb2, GENL_MAX_FAM_OPS, tb[CTRL_ATTR_OPS]); | |
243 | fprintf(fp, "\tcommands supported: \n"); | |
244 | for (i = 0; i < GENL_MAX_FAM_OPS; i++) { | |
245 | if (tb2[i]) { | |
246 | fprintf(fp, "\t\t#%d: ", i); | |
247 | if (0 > print_ctrl_cmds(fp, tb2[i], ctrl_v)) { | |
248 | fprintf(fp, "Error printing command\n"); | |
249 | } | |
250 | /* for next command */ | |
251 | fprintf(fp,"\n"); | |
252 | } | |
253 | } | |
65018ae4 | 254 | |
26328fc3 | 255 | /* end of family::cmds definitions .. */ |
256 | fprintf(fp,"\n"); | |
257 | } | |
80c05b09 JB |
258 | |
259 | if (tb[CTRL_ATTR_MCAST_GROUPS]) { | |
260 | struct rtattr *tb2[GENL_MAX_FAM_GRPS + 1]; | |
261 | int i; | |
262 | ||
263 | parse_rtattr_nested(tb2, GENL_MAX_FAM_GRPS, | |
264 | tb[CTRL_ATTR_MCAST_GROUPS]); | |
265 | fprintf(fp, "\tmulticast groups:\n"); | |
266 | ||
267 | for (i = 0; i < GENL_MAX_FAM_GRPS; i++) { | |
268 | if (tb2[i]) { | |
269 | fprintf(fp, "\t\t#%d: ", i); | |
270 | if (0 > print_ctrl_grp(fp, tb2[i], ctrl_v)) | |
271 | fprintf(fp, "Error printing group\n"); | |
272 | /* for next group */ | |
273 | fprintf(fp,"\n"); | |
274 | } | |
275 | } | |
276 | ||
277 | /* end of family::groups definitions .. */ | |
278 | fprintf(fp,"\n"); | |
279 | } | |
280 | ||
65018ae4 JHS |
281 | fflush(fp); |
282 | return 0; | |
283 | } | |
284 | ||
0628cddd ND |
285 | static int print_ctrl2(const struct sockaddr_nl *who, |
286 | struct nlmsghdr *n, void *arg) | |
287 | { | |
288 | return print_ctrl(who, NULL, n, arg); | |
289 | } | |
290 | ||
65018ae4 JHS |
291 | static int ctrl_list(int cmd, int argc, char **argv) |
292 | { | |
293 | struct rtnl_handle rth; | |
294 | struct nlmsghdr *nlh; | |
295 | struct genlmsghdr *ghdr; | |
296 | int ret = -1; | |
297 | char d[GENL_NAMSIZ]; | |
298 | struct { | |
299 | struct nlmsghdr n; | |
300 | char buf[4096]; | |
301 | } req; | |
302 | ||
303 | memset(&req, 0, sizeof(req)); | |
304 | ||
305 | nlh = &req.n; | |
306 | nlh->nlmsg_len = NLMSG_LENGTH(GENL_HDRLEN); | |
307 | nlh->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK; | |
308 | nlh->nlmsg_type = GENL_ID_CTRL; | |
309 | ||
310 | ghdr = NLMSG_DATA(&req.n); | |
311 | ghdr->cmd = CTRL_CMD_GETFAMILY; | |
312 | ||
313 | if (rtnl_open_byproto(&rth, 0, NETLINK_GENERIC) < 0) { | |
314 | fprintf(stderr, "Cannot open generic netlink socket\n"); | |
315 | exit(1); | |
316 | } | |
317 | ||
318 | if (cmd == CTRL_CMD_GETFAMILY) { | |
319 | if (argc != 2) { | |
320 | fprintf(stderr, "Wrong number of params\n"); | |
321 | return -1; | |
322 | } | |
323 | ||
324 | if (matches(*argv, "name") == 0) { | |
325 | NEXT_ARG(); | |
326 | strncpy(d, *argv, sizeof (d) - 1); | |
327 | addattr_l(nlh, 128, CTRL_ATTR_FAMILY_NAME, | |
328 | d, strlen(d) + 1); | |
329 | } else if (matches(*argv, "id") == 0) { | |
330 | __u16 id; | |
331 | NEXT_ARG(); | |
332 | if (get_u16(&id, *argv, 0)) { | |
333 | fprintf(stderr, "Illegal \"id\"\n"); | |
334 | goto ctrl_done; | |
335 | } | |
336 | ||
337 | addattr_l(nlh, 128, CTRL_ATTR_FAMILY_ID, &id, 2); | |
338 | ||
339 | } else { | |
340 | fprintf(stderr, "Wrong params\n"); | |
341 | goto ctrl_done; | |
342 | } | |
343 | ||
cd70f3f5 | 344 | if (rtnl_talk(&rth, nlh, 0, 0, nlh) < 0) { |
65018ae4 JHS |
345 | fprintf(stderr, "Error talking to the kernel\n"); |
346 | goto ctrl_done; | |
347 | } | |
348 | ||
0628cddd | 349 | if (print_ctrl2(NULL, nlh, (void *) stdout) < 0) { |
65018ae4 JHS |
350 | fprintf(stderr, "Dump terminated\n"); |
351 | goto ctrl_done; | |
352 | } | |
353 | ||
354 | } | |
355 | ||
356 | if (cmd == CTRL_CMD_UNSPEC) { | |
357 | nlh->nlmsg_flags = NLM_F_ROOT|NLM_F_MATCH|NLM_F_REQUEST; | |
358 | nlh->nlmsg_seq = rth.dump = ++rth.seq; | |
359 | ||
6cf8398f | 360 | if (rtnl_send(&rth, nlh, nlh->nlmsg_len) < 0) { |
65018ae4 JHS |
361 | perror("Failed to send dump request\n"); |
362 | goto ctrl_done; | |
363 | } | |
364 | ||
0628cddd | 365 | rtnl_dump_filter(&rth, print_ctrl2, stdout); |
65018ae4 JHS |
366 | |
367 | } | |
368 | ||
369 | ret = 0; | |
370 | ctrl_done: | |
371 | rtnl_close(&rth); | |
372 | return ret; | |
373 | } | |
374 | ||
375 | static int ctrl_listen(int argc, char **argv) | |
376 | { | |
377 | struct rtnl_handle rth; | |
378 | ||
379 | if (rtnl_open_byproto(&rth, nl_mgrp(GENL_ID_CTRL), NETLINK_GENERIC) < 0) { | |
380 | fprintf(stderr, "Canot open generic netlink socket\n"); | |
381 | return -1; | |
382 | } | |
383 | ||
384 | if (rtnl_listen(&rth, print_ctrl, (void *) stdout) < 0) | |
385 | return -1; | |
386 | ||
387 | return 0; | |
388 | } | |
389 | ||
390 | static int parse_ctrl(struct genl_util *a, int argc, char **argv) | |
391 | { | |
392 | argv++; | |
393 | if (--argc <= 0) { | |
394 | fprintf(stderr, "wrong controller params\n"); | |
395 | return -1; | |
396 | } | |
397 | ||
398 | if (matches(*argv, "monitor") == 0) | |
399 | return ctrl_listen(argc-1, argv+1); | |
400 | if (matches(*argv, "get") == 0) | |
401 | return ctrl_list(CTRL_CMD_GETFAMILY, argc-1, argv+1); | |
402 | if (matches(*argv, "list") == 0 || | |
403 | matches(*argv, "show") == 0 || | |
404 | matches(*argv, "lst") == 0) | |
405 | return ctrl_list(CTRL_CMD_UNSPEC, argc-1, argv+1); | |
406 | if (matches(*argv, "help") == 0) | |
407 | return usage(); | |
408 | ||
3669d218 | 409 | fprintf(stderr, "ctrl command \"%s\" is unknown, try \"ctrl help\".\n", |
65018ae4 JHS |
410 | *argv); |
411 | ||
412 | return -1; | |
413 | } | |
414 | ||
415 | struct genl_util ctrl_genl_util = { | |
416 | .name = "ctrl", | |
417 | .parse_genlopt = parse_ctrl, | |
0628cddd | 418 | .print_genlopt = print_ctrl2, |
65018ae4 | 419 | }; |