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git.proxmox.com Git - mirror_iproute2.git/blob - genl/ctrl.c
2 * ctrl.c generic netlink controller
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.
9 * Authors: J Hadi Salim (hadi@cyberus.ca)
10 * Johannes Berg (johannes@sipsolutions.net)
18 #include <sys/socket.h>
19 #include <netinet/in.h>
20 #include <arpa/inet.h>
24 #include "genl_utils.h"
26 #define GENL_MAX_FAM_OPS 256
27 #define GENL_MAX_FAM_GRPS 256
29 static int usage(void)
31 fprintf(stderr
,"Usage: ctrl <CMD>\n" \
32 "CMD := get <PARMS> | list | monitor\n" \
33 "PARMS := name <name> | id <id>\n" \
37 "\tctrl get name foobar\n" \
38 "\tctrl get id 0xF\n");
42 int genl_ctrl_resolve_family(const char *family
)
44 struct rtnl_handle rth
;
46 struct genlmsghdr
*ghdr
;
53 memset(&req
, 0, sizeof(req
));
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
;
60 ghdr
= NLMSG_DATA(&req
.n
);
61 ghdr
->cmd
= CTRL_CMD_GETFAMILY
;
63 if (rtnl_open_byproto(&rth
, 0, NETLINK_GENERIC
) < 0) {
64 fprintf(stderr
, "Cannot open generic netlink socket\n");
68 addattr_l(nlh
, 128, CTRL_ATTR_FAMILY_NAME
, family
, strlen(family
) + 1);
70 if (rtnl_talk(&rth
, nlh
, nlh
, sizeof(req
)) < 0) {
71 fprintf(stderr
, "Error talking to the kernel\n");
76 struct rtattr
*tb
[CTRL_ATTR_MAX
+ 1];
77 struct genlmsghdr
*ghdr
= NLMSG_DATA(nlh
);
78 int len
= nlh
->nlmsg_len
;
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
);
87 if (ghdr
->cmd
!= CTRL_CMD_NEWFAMILY
) {
88 fprintf(stderr
, "Unknown controller command %d\n", ghdr
->cmd
);
92 len
-= NLMSG_LENGTH(GENL_HDRLEN
);
95 fprintf(stderr
, "wrong controller message len %d\n", len
);
99 attrs
= (struct rtattr
*) ((char *) ghdr
+ GENL_HDRLEN
);
100 parse_rtattr(tb
, CTRL_ATTR_MAX
, attrs
, len
);
102 if (tb
[CTRL_ATTR_FAMILY_ID
] == NULL
) {
103 fprintf(stderr
, "Missing family id TLV\n");
107 ret
= rta_getattr_u16(tb
[CTRL_ATTR_FAMILY_ID
]);
115 static void print_ctrl_cmd_flags(FILE *fp
, __u32 fl
)
117 fprintf(fp
, "\n\t\tCapabilities (0x%x):\n ", fl
);
122 fprintf(fp
, "\t\t ");
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");
136 static int print_ctrl_cmds(FILE *fp
, struct rtattr
*arg
, __u32 ctrl_ver
)
138 struct rtattr
*tb
[CTRL_ATTR_OP_MAX
+ 1];
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
);
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
);
157 static int print_ctrl_grp(FILE *fp
, struct rtattr
*arg
, __u32 ctrl_ver
)
159 struct rtattr
*tb
[CTRL_ATTR_MCAST_GRP_MAX
+ 1];
164 parse_rtattr_nested(tb
, CTRL_ATTR_MCAST_GRP_MAX
, arg
);
166 __u32
*id
= RTA_DATA(tb
[CTRL_ATTR_MCAST_GRP_ID
]);
167 fprintf(fp
, " ID-0x%x ",*id
);
170 char *name
= RTA_DATA(tb
[CTRL_ATTR_MCAST_GRP_NAME
]);
171 fprintf(fp
, " name: %s ", name
);
178 * The controller sends one nlmsg per family
180 static int print_ctrl(const struct sockaddr_nl
*who
, struct nlmsghdr
*n
,
183 struct rtattr
*tb
[CTRL_ATTR_MAX
+ 1];
184 struct genlmsghdr
*ghdr
= NLMSG_DATA(n
);
185 int len
= n
->nlmsg_len
;
186 struct rtattr
*attrs
;
187 FILE *fp
= (FILE *) arg
;
190 if (n
->nlmsg_type
!= GENL_ID_CTRL
) {
191 fprintf(stderr
, "Not a controller message, nlmsg_len=%d "
192 "nlmsg_type=0x%x\n", n
->nlmsg_len
, n
->nlmsg_type
);
196 if (ghdr
->cmd
!= CTRL_CMD_GETFAMILY
&&
197 ghdr
->cmd
!= CTRL_CMD_DELFAMILY
&&
198 ghdr
->cmd
!= CTRL_CMD_NEWFAMILY
&&
199 ghdr
->cmd
!= CTRL_CMD_NEWMCAST_GRP
&&
200 ghdr
->cmd
!= CTRL_CMD_DELMCAST_GRP
) {
201 fprintf(stderr
, "Unknown controller command %d\n", ghdr
->cmd
);
205 len
-= NLMSG_LENGTH(GENL_HDRLEN
);
208 fprintf(stderr
, "wrong controller message len %d\n", len
);
212 attrs
= (struct rtattr
*) ((char *) ghdr
+ GENL_HDRLEN
);
213 parse_rtattr(tb
, CTRL_ATTR_MAX
, attrs
, len
);
215 if (tb
[CTRL_ATTR_FAMILY_NAME
]) {
216 char *name
= RTA_DATA(tb
[CTRL_ATTR_FAMILY_NAME
]);
217 fprintf(fp
, "\nName: %s\n",name
);
219 if (tb
[CTRL_ATTR_FAMILY_ID
]) {
220 __u16
*id
= RTA_DATA(tb
[CTRL_ATTR_FAMILY_ID
]);
221 fprintf(fp
, "\tID: 0x%x ",*id
);
223 if (tb
[CTRL_ATTR_VERSION
]) {
224 __u32
*v
= RTA_DATA(tb
[CTRL_ATTR_VERSION
]);
225 fprintf(fp
, " Version: 0x%x ",*v
);
228 if (tb
[CTRL_ATTR_HDRSIZE
]) {
229 __u32
*h
= RTA_DATA(tb
[CTRL_ATTR_HDRSIZE
]);
230 fprintf(fp
, " header size: %d ",*h
);
232 if (tb
[CTRL_ATTR_MAXATTR
]) {
233 __u32
*ma
= RTA_DATA(tb
[CTRL_ATTR_MAXATTR
]);
234 fprintf(fp
, " max attribs: %d ",*ma
);
236 /* end of family definitions .. */
238 if (tb
[CTRL_ATTR_OPS
]) {
239 struct rtattr
*tb2
[GENL_MAX_FAM_OPS
];
241 parse_rtattr_nested(tb2
, GENL_MAX_FAM_OPS
, tb
[CTRL_ATTR_OPS
]);
242 fprintf(fp
, "\tcommands supported: \n");
243 for (i
= 0; i
< GENL_MAX_FAM_OPS
; i
++) {
245 fprintf(fp
, "\t\t#%d: ", i
);
246 if (0 > print_ctrl_cmds(fp
, tb2
[i
], ctrl_v
)) {
247 fprintf(fp
, "Error printing command\n");
249 /* for next command */
254 /* end of family::cmds definitions .. */
258 if (tb
[CTRL_ATTR_MCAST_GROUPS
]) {
259 struct rtattr
*tb2
[GENL_MAX_FAM_GRPS
+ 1];
262 parse_rtattr_nested(tb2
, GENL_MAX_FAM_GRPS
,
263 tb
[CTRL_ATTR_MCAST_GROUPS
]);
264 fprintf(fp
, "\tmulticast groups:\n");
266 for (i
= 0; i
< GENL_MAX_FAM_GRPS
; i
++) {
268 fprintf(fp
, "\t\t#%d: ", i
);
269 if (0 > print_ctrl_grp(fp
, tb2
[i
], ctrl_v
))
270 fprintf(fp
, "Error printing group\n");
276 /* end of family::groups definitions .. */
284 static int ctrl_list(int cmd
, int argc
, char **argv
)
286 struct rtnl_handle rth
;
287 struct nlmsghdr
*nlh
;
288 struct genlmsghdr
*ghdr
;
296 memset(&req
, 0, sizeof(req
));
299 nlh
->nlmsg_len
= NLMSG_LENGTH(GENL_HDRLEN
);
300 nlh
->nlmsg_flags
= NLM_F_REQUEST
| NLM_F_ACK
;
301 nlh
->nlmsg_type
= GENL_ID_CTRL
;
303 ghdr
= NLMSG_DATA(&req
.n
);
304 ghdr
->cmd
= CTRL_CMD_GETFAMILY
;
306 if (rtnl_open_byproto(&rth
, 0, NETLINK_GENERIC
) < 0) {
307 fprintf(stderr
, "Cannot open generic netlink socket\n");
311 if (cmd
== CTRL_CMD_GETFAMILY
) {
313 fprintf(stderr
, "Wrong number of params\n");
317 if (matches(*argv
, "name") == 0) {
319 strncpy(d
, *argv
, sizeof (d
) - 1);
320 addattr_l(nlh
, 128, CTRL_ATTR_FAMILY_NAME
,
322 } else if (matches(*argv
, "id") == 0) {
325 if (get_u16(&id
, *argv
, 0)) {
326 fprintf(stderr
, "Illegal \"id\"\n");
330 addattr_l(nlh
, 128, CTRL_ATTR_FAMILY_ID
, &id
, 2);
333 fprintf(stderr
, "Wrong params\n");
337 if (rtnl_talk(&rth
, nlh
, nlh
, sizeof(req
)) < 0) {
338 fprintf(stderr
, "Error talking to the kernel\n");
342 if (print_ctrl(NULL
, nlh
, (void *) stdout
) < 0) {
343 fprintf(stderr
, "Dump terminated\n");
349 if (cmd
== CTRL_CMD_UNSPEC
) {
350 nlh
->nlmsg_flags
= NLM_F_ROOT
|NLM_F_MATCH
|NLM_F_REQUEST
;
351 nlh
->nlmsg_seq
= rth
.dump
= ++rth
.seq
;
353 if (rtnl_send(&rth
, nlh
, nlh
->nlmsg_len
) < 0) {
354 perror("Failed to send dump request\n");
358 rtnl_dump_filter(&rth
, print_ctrl
, stdout
);
368 static int ctrl_listen(int argc
, char **argv
)
370 struct rtnl_handle rth
;
372 if (rtnl_open_byproto(&rth
, nl_mgrp(GENL_ID_CTRL
), NETLINK_GENERIC
) < 0) {
373 fprintf(stderr
, "Canot open generic netlink socket\n");
377 if (rtnl_listen(&rth
, print_ctrl
, (void *) stdout
) < 0)
383 static int parse_ctrl(struct genl_util
*a
, int argc
, char **argv
)
387 fprintf(stderr
, "wrong controller params\n");
391 if (matches(*argv
, "monitor") == 0)
392 return ctrl_listen(argc
-1, argv
+1);
393 if (matches(*argv
, "get") == 0)
394 return ctrl_list(CTRL_CMD_GETFAMILY
, argc
-1, argv
+1);
395 if (matches(*argv
, "list") == 0 ||
396 matches(*argv
, "show") == 0 ||
397 matches(*argv
, "lst") == 0)
398 return ctrl_list(CTRL_CMD_UNSPEC
, argc
-1, argv
+1);
399 if (matches(*argv
, "help") == 0)
402 fprintf(stderr
, "ctrl command \"%s\" is unknown, try \"ctrl help\".\n",
408 struct genl_util ctrl_genl_util
= {
410 .parse_genlopt
= parse_ctrl
,
411 .print_genlopt
= print_ctrl
,