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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
482a8524 TG |
2 | #ifndef __NET_GENERIC_NETLINK_H |
3 | #define __NET_GENERIC_NETLINK_H | |
4 | ||
5 | #include <linux/genetlink.h> | |
6 | #include <net/netlink.h> | |
134e6375 | 7 | #include <net/net_namespace.h> |
482a8524 | 8 | |
58050fce TG |
9 | #define GENLMSG_DEFAULT_SIZE (NLMSG_DEFAULT_SIZE - GENL_HDRLEN) |
10 | ||
2dbba6f7 JB |
11 | /** |
12 | * struct genl_multicast_group - generic netlink multicast group | |
13 | * @name: name of the multicast group, names are per-family | |
5c221f0a | 14 | * @flags: GENL_* flags (%GENL_ADMIN_PERM or %GENL_UNS_ADMIN_PERM) |
2dbba6f7 | 15 | */ |
fd2c3ef7 | 16 | struct genl_multicast_group { |
2dbba6f7 | 17 | char name[GENL_NAMSIZ]; |
4d54cc32 | 18 | u8 flags; |
2dbba6f7 JB |
19 | }; |
20 | ||
20b0b53a | 21 | struct genl_split_ops; |
ff4c92d8 JB |
22 | struct genl_info; |
23 | ||
482a8524 TG |
24 | /** |
25 | * struct genl_family - generic netlink family | |
482a8524 TG |
26 | * @hdrsize: length of user specific header in bytes |
27 | * @name: name of family | |
28 | * @version: protocol version | |
29 | * @maxattr: maximum number of attributes supported | |
3b0f31f2 | 30 | * @policy: netlink policy |
134e6375 JB |
31 | * @netnsok: set to true if the family can handle network |
32 | * namespaces and should be presented in all of them | |
f555f3d7 JB |
33 | * @parallel_ops: operations can be called in parallel and aren't |
34 | * synchronized by the core genetlink code | |
ff4c92d8 JB |
35 | * @pre_doit: called before an operation's doit callback, it may |
36 | * do additional, common, filtering and return an error | |
37 | * @post_doit: called after an operation's doit callback, it may | |
38 | * undo operations done by pre_doit, for example release locks | |
a1a824f4 | 39 | * @module: pointer to the owning module (set to THIS_MODULE) |
489111e5 JB |
40 | * @mcgrps: multicast groups used by this family |
41 | * @n_mcgrps: number of multicast groups | |
9c5d03d3 | 42 | * @resv_start_op: first operation for which reserved fields of the header |
4fa86555 JK |
43 | * can be validated and policies are required (see below); |
44 | * new families should leave this field at zero | |
489111e5 JB |
45 | * @ops: the operations supported by this family |
46 | * @n_ops: number of operations supported by this family | |
0b588afd JK |
47 | * @small_ops: the small-struct operations supported by this family |
48 | * @n_small_ops: number of small-struct operations supported by this family | |
b8fd60c3 JK |
49 | * @split_ops: the split do/dump form of operation definition |
50 | * @n_split_ops: number of entries in @split_ops, not that with split do/dump | |
51 | * ops the number of entries is not the same as number of commands | |
4fa86555 JK |
52 | * |
53 | * Attribute policies (the combination of @policy and @maxattr fields) | |
54 | * can be attached at the family level or at the operation level. | |
55 | * If both are present the per-operation policy takes precedence. | |
56 | * For operations before @resv_start_op lack of policy means that the core | |
57 | * will perform no attribute parsing or validation. For newer operations | |
58 | * if policy is not provided core will reject all TLV attributes. | |
482a8524 | 59 | */ |
fd2c3ef7 | 60 | struct genl_family { |
482a8524 TG |
61 | unsigned int hdrsize; |
62 | char name[GENL_NAMSIZ]; | |
63 | unsigned int version; | |
64 | unsigned int maxattr; | |
e5086736 JK |
65 | u8 netnsok:1; |
66 | u8 parallel_ops:1; | |
67 | u8 n_ops; | |
0b588afd | 68 | u8 n_small_ops; |
b8fd60c3 | 69 | u8 n_split_ops; |
e5086736 | 70 | u8 n_mcgrps; |
9c5d03d3 | 71 | u8 resv_start_op; |
3b0f31f2 | 72 | const struct nla_policy *policy; |
20b0b53a | 73 | int (*pre_doit)(const struct genl_split_ops *ops, |
ff4c92d8 JB |
74 | struct sk_buff *skb, |
75 | struct genl_info *info); | |
20b0b53a | 76 | void (*post_doit)(const struct genl_split_ops *ops, |
ff4c92d8 JB |
77 | struct sk_buff *skb, |
78 | struct genl_info *info); | |
489111e5 | 79 | const struct genl_ops * ops; |
0b588afd | 80 | const struct genl_small_ops *small_ops; |
b8fd60c3 | 81 | const struct genl_split_ops *split_ops; |
489111e5 | 82 | const struct genl_multicast_group *mcgrps; |
33c6b1f6 | 83 | struct module *module; |
7c3eaa02 JK |
84 | |
85 | /* private: internal use only */ | |
86 | /* protocol family identifier */ | |
87 | int id; | |
88 | /* starting number of multicast group IDs in this family */ | |
89 | unsigned int mcgrp_offset; | |
482a8524 TG |
90 | }; |
91 | ||
482a8524 TG |
92 | /** |
93 | * struct genl_info - receiving information | |
94 | * @snd_seq: sending sequence number | |
15e47304 | 95 | * @snd_portid: netlink portid of sender |
482a8524 TG |
96 | * @nlhdr: netlink message header |
97 | * @genlhdr: generic netlink message header | |
98 | * @userhdr: user specific header | |
99 | * @attrs: netlink attributes | |
ff4c92d8 JB |
100 | * @_net: network namespace |
101 | * @user_ptr: user pointers | |
7ab606d1 | 102 | * @extack: extended ACK report struct |
482a8524 | 103 | */ |
fd2c3ef7 | 104 | struct genl_info { |
482a8524 | 105 | u32 snd_seq; |
15e47304 | 106 | u32 snd_portid; |
482a8524 TG |
107 | struct nlmsghdr * nlhdr; |
108 | struct genlmsghdr * genlhdr; | |
109 | void * userhdr; | |
110 | struct nlattr ** attrs; | |
0c5c9fb5 | 111 | possible_net_t _net; |
ff4c92d8 | 112 | void * user_ptr[2]; |
7ab606d1 | 113 | struct netlink_ext_ack *extack; |
482a8524 TG |
114 | }; |
115 | ||
134e6375 JB |
116 | static inline struct net *genl_info_net(struct genl_info *info) |
117 | { | |
c2d9ba9b | 118 | return read_pnet(&info->_net); |
134e6375 JB |
119 | } |
120 | ||
121 | static inline void genl_info_net_set(struct genl_info *info, struct net *net) | |
122 | { | |
c2d9ba9b | 123 | write_pnet(&info->_net, net); |
134e6375 | 124 | } |
134e6375 | 125 | |
7ab606d1 JB |
126 | #define GENL_SET_ERR_MSG(info, msg) NL_SET_ERR_MSG((info)->extack, msg) |
127 | ||
a3400e87 PA |
128 | #define GENL_SET_ERR_MSG_FMT(info, msg, args...) \ |
129 | NL_SET_ERR_MSG_FMT((info)->extack, msg, ##args) | |
130 | ||
45dca157 JK |
131 | /* Report that a root attribute is missing */ |
132 | #define GENL_REQ_ATTR_CHECK(info, attr) ({ \ | |
133 | struct genl_info *__info = (info); \ | |
134 | \ | |
135 | NL_REQ_ATTR_CHECK(__info->extack, NULL, __info->attrs, (attr)); \ | |
136 | }) | |
137 | ||
ef6243ac JB |
138 | enum genl_validate_flags { |
139 | GENL_DONT_VALIDATE_STRICT = BIT(0), | |
140 | GENL_DONT_VALIDATE_DUMP = BIT(1), | |
141 | GENL_DONT_VALIDATE_DUMP_STRICT = BIT(2), | |
142 | }; | |
143 | ||
1927f41a | 144 | /** |
0b588afd JK |
145 | * struct genl_small_ops - generic netlink operations (small version) |
146 | * @cmd: command identifier | |
147 | * @internal_flags: flags used by the family | |
5c221f0a | 148 | * @flags: GENL_* flags (%GENL_ADMIN_PERM or %GENL_UNS_ADMIN_PERM) |
0b588afd JK |
149 | * @validate: validation flags from enum genl_validate_flags |
150 | * @doit: standard command callback | |
151 | * @dumpit: callback for dumpers | |
152 | * | |
153 | * This is a cut-down version of struct genl_ops for users who don't need | |
154 | * most of the ancillary infra and want to save space. | |
1927f41a | 155 | */ |
0b588afd JK |
156 | struct genl_small_ops { |
157 | int (*doit)(struct sk_buff *skb, struct genl_info *info); | |
158 | int (*dumpit)(struct sk_buff *skb, struct netlink_callback *cb); | |
159 | u8 cmd; | |
160 | u8 internal_flags; | |
161 | u8 flags; | |
162 | u8 validate; | |
1927f41a JP |
163 | }; |
164 | ||
482a8524 TG |
165 | /** |
166 | * struct genl_ops - generic netlink operations | |
167 | * @cmd: command identifier | |
ff4c92d8 | 168 | * @internal_flags: flags used by the family |
5c221f0a | 169 | * @flags: GENL_* flags (%GENL_ADMIN_PERM or %GENL_UNS_ADMIN_PERM) |
48526a0f JK |
170 | * @maxattr: maximum number of attributes supported |
171 | * @policy: netlink policy (takes precedence over family policy) | |
3ddf9b43 | 172 | * @validate: validation flags from enum genl_validate_flags |
482a8524 | 173 | * @doit: standard command callback |
fc9e50f5 | 174 | * @start: start callback for dumps |
482a8524 | 175 | * @dumpit: callback for dumpers |
a4d1366d | 176 | * @done: completion callback for dumps |
482a8524 | 177 | */ |
fd2c3ef7 | 178 | struct genl_ops { |
482a8524 TG |
179 | int (*doit)(struct sk_buff *skb, |
180 | struct genl_info *info); | |
fc9e50f5 | 181 | int (*start)(struct netlink_callback *cb); |
482a8524 TG |
182 | int (*dumpit)(struct sk_buff *skb, |
183 | struct netlink_callback *cb); | |
a4d1366d | 184 | int (*done)(struct netlink_callback *cb); |
48526a0f JK |
185 | const struct nla_policy *policy; |
186 | unsigned int maxattr; | |
3f5ccd06 JB |
187 | u8 cmd; |
188 | u8 internal_flags; | |
189 | u8 flags; | |
ef6243ac | 190 | u8 validate; |
482a8524 TG |
191 | }; |
192 | ||
20b0b53a JK |
193 | /** |
194 | * struct genl_split_ops - generic netlink operations (do/dump split version) | |
195 | * @cmd: command identifier | |
196 | * @internal_flags: flags used by the family | |
197 | * @flags: GENL_* flags (%GENL_ADMIN_PERM or %GENL_UNS_ADMIN_PERM) | |
198 | * @validate: validation flags from enum genl_validate_flags | |
199 | * @policy: netlink policy (takes precedence over family policy) | |
200 | * @maxattr: maximum number of attributes supported | |
201 | * | |
202 | * Do callbacks: | |
203 | * @pre_doit: called before an operation's @doit callback, it may | |
204 | * do additional, common, filtering and return an error | |
205 | * @doit: standard command callback | |
206 | * @post_doit: called after an operation's @doit callback, it may | |
207 | * undo operations done by pre_doit, for example release locks | |
208 | * | |
209 | * Dump callbacks: | |
210 | * @start: start callback for dumps | |
211 | * @dumpit: callback for dumpers | |
212 | * @done: completion callback for dumps | |
213 | * | |
214 | * Do callbacks can be used if %GENL_CMD_CAP_DO is set in @flags. | |
215 | * Dump callbacks can be used if %GENL_CMD_CAP_DUMP is set in @flags. | |
216 | * Exactly one of those flags must be set. | |
217 | */ | |
218 | struct genl_split_ops { | |
219 | union { | |
220 | struct { | |
221 | int (*pre_doit)(const struct genl_split_ops *ops, | |
222 | struct sk_buff *skb, | |
223 | struct genl_info *info); | |
224 | int (*doit)(struct sk_buff *skb, | |
225 | struct genl_info *info); | |
226 | void (*post_doit)(const struct genl_split_ops *ops, | |
227 | struct sk_buff *skb, | |
228 | struct genl_info *info); | |
229 | }; | |
230 | struct { | |
231 | int (*start)(struct netlink_callback *cb); | |
232 | int (*dumpit)(struct sk_buff *skb, | |
233 | struct netlink_callback *cb); | |
234 | int (*done)(struct netlink_callback *cb); | |
235 | }; | |
236 | }; | |
237 | const struct nla_policy *policy; | |
238 | unsigned int maxattr; | |
239 | u8 cmd; | |
240 | u8 internal_flags; | |
241 | u8 flags; | |
242 | u8 validate; | |
243 | }; | |
244 | ||
0b588afd | 245 | /** |
a1a824f4 | 246 | * struct genl_dumpit_info - info that is available during dumpit op call |
0b588afd | 247 | * @family: generic netlink family - for internal genl code usage |
a1a824f4 | 248 | * @op: generic netlink ops - for internal genl code usage |
0b588afd JK |
249 | * @attrs: netlink attributes |
250 | */ | |
251 | struct genl_dumpit_info { | |
252 | const struct genl_family *family; | |
20b0b53a | 253 | struct genl_split_ops op; |
0b588afd JK |
254 | struct nlattr **attrs; |
255 | }; | |
256 | ||
257 | static inline const struct genl_dumpit_info * | |
258 | genl_dumpit_info(struct netlink_callback *cb) | |
259 | { | |
260 | return cb->data; | |
261 | } | |
262 | ||
489111e5 | 263 | int genl_register_family(struct genl_family *family); |
2ae0f17d JB |
264 | int genl_unregister_family(const struct genl_family *family); |
265 | void genl_notify(const struct genl_family *family, struct sk_buff *skb, | |
92c14d9b | 266 | struct genl_info *info, u32 group, gfp_t flags); |
482a8524 | 267 | |
15e47304 | 268 | void *genlmsg_put(struct sk_buff *skb, u32 portid, u32 seq, |
2ae0f17d | 269 | const struct genl_family *family, int flags, u8 cmd); |
482a8524 | 270 | |
670dc283 JB |
271 | /** |
272 | * genlmsg_nlhdr - Obtain netlink header from user specified header | |
273 | * @user_hdr: user header as returned from genlmsg_put() | |
670dc283 JB |
274 | * |
275 | * Returns pointer to netlink header. | |
276 | */ | |
0a833c29 | 277 | static inline struct nlmsghdr *genlmsg_nlhdr(void *user_hdr) |
670dc283 JB |
278 | { |
279 | return (struct nlmsghdr *)((char *)user_hdr - | |
670dc283 JB |
280 | GENL_HDRLEN - |
281 | NLMSG_HDRLEN); | |
282 | } | |
283 | ||
7b1883ce | 284 | /** |
8cb08174 | 285 | * genlmsg_parse_deprecated - parse attributes of a genetlink message |
7b1883ce JS |
286 | * @nlh: netlink message header |
287 | * @family: genetlink message family | |
288 | * @tb: destination array with maxtype+1 elements | |
289 | * @maxtype: maximum attribute type to be expected | |
290 | * @policy: validation policy | |
fceb6435 JB |
291 | * @extack: extended ACK report struct |
292 | */ | |
8cb08174 JB |
293 | static inline int genlmsg_parse_deprecated(const struct nlmsghdr *nlh, |
294 | const struct genl_family *family, | |
295 | struct nlattr *tb[], int maxtype, | |
296 | const struct nla_policy *policy, | |
297 | struct netlink_ext_ack *extack) | |
7b1883ce | 298 | { |
8cb08174 JB |
299 | return __nlmsg_parse(nlh, family->hdrsize + GENL_HDRLEN, tb, maxtype, |
300 | policy, NL_VALIDATE_LIBERAL, extack); | |
7b1883ce JS |
301 | } |
302 | ||
3de64403 JB |
303 | /** |
304 | * genlmsg_parse - parse attributes of a genetlink message | |
305 | * @nlh: netlink message header | |
306 | * @family: genetlink message family | |
307 | * @tb: destination array with maxtype+1 elements | |
308 | * @maxtype: maximum attribute type to be expected | |
309 | * @policy: validation policy | |
310 | * @extack: extended ACK report struct | |
311 | */ | |
312 | static inline int genlmsg_parse(const struct nlmsghdr *nlh, | |
313 | const struct genl_family *family, | |
314 | struct nlattr *tb[], int maxtype, | |
315 | const struct nla_policy *policy, | |
316 | struct netlink_ext_ack *extack) | |
317 | { | |
318 | return __nlmsg_parse(nlh, family->hdrsize + GENL_HDRLEN, tb, maxtype, | |
319 | policy, NL_VALIDATE_STRICT, extack); | |
320 | } | |
321 | ||
670dc283 JB |
322 | /** |
323 | * genl_dump_check_consistent - check if sequence is consistent and advertise if not | |
324 | * @cb: netlink callback structure that stores the sequence number | |
325 | * @user_hdr: user header as returned from genlmsg_put() | |
670dc283 JB |
326 | * |
327 | * Cf. nl_dump_check_consistent(), this just provides a wrapper to make it | |
328 | * simpler to use with generic netlink. | |
329 | */ | |
330 | static inline void genl_dump_check_consistent(struct netlink_callback *cb, | |
0a833c29 | 331 | void *user_hdr) |
670dc283 | 332 | { |
0a833c29 | 333 | nl_dump_check_consistent(cb, genlmsg_nlhdr(user_hdr)); |
670dc283 JB |
334 | } |
335 | ||
17c157c8 TG |
336 | /** |
337 | * genlmsg_put_reply - Add generic netlink header to a reply message | |
338 | * @skb: socket buffer holding the message | |
339 | * @info: receiver info | |
340 | * @family: generic netlink family | |
341 | * @flags: netlink message flags | |
342 | * @cmd: generic netlink command | |
343 | * | |
344 | * Returns pointer to user specific header | |
345 | */ | |
346 | static inline void *genlmsg_put_reply(struct sk_buff *skb, | |
347 | struct genl_info *info, | |
2ae0f17d | 348 | const struct genl_family *family, |
17c157c8 TG |
349 | int flags, u8 cmd) |
350 | { | |
15e47304 | 351 | return genlmsg_put(skb, info->snd_portid, info->snd_seq, family, |
17c157c8 TG |
352 | flags, cmd); |
353 | } | |
354 | ||
482a8524 TG |
355 | /** |
356 | * genlmsg_end - Finalize a generic netlink message | |
357 | * @skb: socket buffer the message is stored in | |
358 | * @hdr: user specific header | |
359 | */ | |
053c095a | 360 | static inline void genlmsg_end(struct sk_buff *skb, void *hdr) |
482a8524 | 361 | { |
053c095a | 362 | nlmsg_end(skb, hdr - GENL_HDRLEN - NLMSG_HDRLEN); |
482a8524 TG |
363 | } |
364 | ||
365 | /** | |
366 | * genlmsg_cancel - Cancel construction of a generic netlink message | |
367 | * @skb: socket buffer the message is stored in | |
368 | * @hdr: generic netlink message header | |
369 | */ | |
bc3ed28c | 370 | static inline void genlmsg_cancel(struct sk_buff *skb, void *hdr) |
482a8524 | 371 | { |
38db9e1d JL |
372 | if (hdr) |
373 | nlmsg_cancel(skb, hdr - GENL_HDRLEN - NLMSG_HDRLEN); | |
482a8524 TG |
374 | } |
375 | ||
376 | /** | |
134e6375 | 377 | * genlmsg_multicast_netns - multicast a netlink message to a specific netns |
68eb5503 | 378 | * @family: the generic netlink family |
134e6375 JB |
379 | * @net: the net namespace |
380 | * @skb: netlink message as socket buffer | |
15e47304 | 381 | * @portid: own netlink portid to avoid sending to yourself |
2a94fe48 | 382 | * @group: offset of multicast group in groups array |
134e6375 JB |
383 | * @flags: allocation flags |
384 | */ | |
2ae0f17d | 385 | static inline int genlmsg_multicast_netns(const struct genl_family *family, |
68eb5503 | 386 | struct net *net, struct sk_buff *skb, |
15e47304 | 387 | u32 portid, unsigned int group, gfp_t flags) |
134e6375 | 388 | { |
220815a9 | 389 | if (WARN_ON_ONCE(group >= family->n_mcgrps)) |
2a94fe48 JB |
390 | return -EINVAL; |
391 | group = family->mcgrp_offset + group; | |
15e47304 | 392 | return nlmsg_multicast(net->genl_sock, skb, portid, group, flags); |
134e6375 JB |
393 | } |
394 | ||
395 | /** | |
396 | * genlmsg_multicast - multicast a netlink message to the default netns | |
68eb5503 | 397 | * @family: the generic netlink family |
482a8524 | 398 | * @skb: netlink message as socket buffer |
15e47304 | 399 | * @portid: own netlink portid to avoid sending to yourself |
2a94fe48 | 400 | * @group: offset of multicast group in groups array |
d387f6ad | 401 | * @flags: allocation flags |
482a8524 | 402 | */ |
2ae0f17d | 403 | static inline int genlmsg_multicast(const struct genl_family *family, |
68eb5503 | 404 | struct sk_buff *skb, u32 portid, |
d387f6ad | 405 | unsigned int group, gfp_t flags) |
482a8524 | 406 | { |
68eb5503 JB |
407 | return genlmsg_multicast_netns(family, &init_net, skb, |
408 | portid, group, flags); | |
482a8524 TG |
409 | } |
410 | ||
134e6375 JB |
411 | /** |
412 | * genlmsg_multicast_allns - multicast a netlink message to all net namespaces | |
68eb5503 | 413 | * @family: the generic netlink family |
134e6375 | 414 | * @skb: netlink message as socket buffer |
15e47304 | 415 | * @portid: own netlink portid to avoid sending to yourself |
2a94fe48 | 416 | * @group: offset of multicast group in groups array |
134e6375 JB |
417 | * @flags: allocation flags |
418 | * | |
419 | * This function must hold the RTNL or rcu_read_lock(). | |
420 | */ | |
2ae0f17d | 421 | int genlmsg_multicast_allns(const struct genl_family *family, |
68eb5503 | 422 | struct sk_buff *skb, u32 portid, |
134e6375 JB |
423 | unsigned int group, gfp_t flags); |
424 | ||
482a8524 TG |
425 | /** |
426 | * genlmsg_unicast - unicast a netlink message | |
a1a824f4 | 427 | * @net: network namespace to look up @portid in |
482a8524 | 428 | * @skb: netlink message as socket buffer |
15e47304 | 429 | * @portid: netlink portid of the destination socket |
482a8524 | 430 | */ |
15e47304 | 431 | static inline int genlmsg_unicast(struct net *net, struct sk_buff *skb, u32 portid) |
482a8524 | 432 | { |
15e47304 | 433 | return nlmsg_unicast(net->genl_sock, skb, portid); |
482a8524 TG |
434 | } |
435 | ||
81878d27 TG |
436 | /** |
437 | * genlmsg_reply - reply to a request | |
438 | * @skb: netlink message to be sent back | |
439 | * @info: receiver information | |
440 | */ | |
441 | static inline int genlmsg_reply(struct sk_buff *skb, struct genl_info *info) | |
442 | { | |
15e47304 | 443 | return genlmsg_unicast(genl_info_net(info), skb, info->snd_portid); |
81878d27 TG |
444 | } |
445 | ||
fb0ba6bd | 446 | /** |
a1a824f4 | 447 | * genlmsg_data - head of message payload |
70f23fd6 | 448 | * @gnlh: genetlink message header |
fb0ba6bd BS |
449 | */ |
450 | static inline void *genlmsg_data(const struct genlmsghdr *gnlh) | |
451 | { | |
452 | return ((unsigned char *) gnlh + GENL_HDRLEN); | |
453 | } | |
454 | ||
455 | /** | |
456 | * genlmsg_len - length of message payload | |
457 | * @gnlh: genetlink message header | |
458 | */ | |
459 | static inline int genlmsg_len(const struct genlmsghdr *gnlh) | |
460 | { | |
461 | struct nlmsghdr *nlh = (struct nlmsghdr *)((unsigned char *)gnlh - | |
462 | NLMSG_HDRLEN); | |
463 | return (nlh->nlmsg_len - GENL_HDRLEN - NLMSG_HDRLEN); | |
464 | } | |
465 | ||
17db952c BS |
466 | /** |
467 | * genlmsg_msg_size - length of genetlink message not including padding | |
468 | * @payload: length of message payload | |
469 | */ | |
470 | static inline int genlmsg_msg_size(int payload) | |
471 | { | |
472 | return GENL_HDRLEN + payload; | |
473 | } | |
474 | ||
475 | /** | |
476 | * genlmsg_total_size - length of genetlink message including padding | |
477 | * @payload: length of message payload | |
478 | */ | |
479 | static inline int genlmsg_total_size(int payload) | |
480 | { | |
481 | return NLMSG_ALIGN(genlmsg_msg_size(payload)); | |
482 | } | |
483 | ||
3dabc715 TG |
484 | /** |
485 | * genlmsg_new - Allocate a new generic netlink message | |
486 | * @payload: size of the message payload | |
487 | * @flags: the type of memory to allocate. | |
488 | */ | |
489 | static inline struct sk_buff *genlmsg_new(size_t payload, gfp_t flags) | |
490 | { | |
491 | return nlmsg_new(genlmsg_total_size(payload), flags); | |
492 | } | |
493 | ||
62b68e99 JB |
494 | /** |
495 | * genl_set_err - report error to genetlink broadcast listeners | |
68eb5503 | 496 | * @family: the generic netlink family |
62b68e99 JB |
497 | * @net: the network namespace to report the error to |
498 | * @portid: the PORTID of a process that we want to skip (if any) | |
499 | * @group: the broadcast group that will notice the error | |
2a94fe48 | 500 | * (this is the offset of the multicast group in the groups array) |
62b68e99 JB |
501 | * @code: error code, must be negative (as usual in kernelspace) |
502 | * | |
503 | * This function returns the number of broadcast listeners that have set the | |
504 | * NETLINK_RECV_NO_ENOBUFS socket option. | |
505 | */ | |
2ae0f17d JB |
506 | static inline int genl_set_err(const struct genl_family *family, |
507 | struct net *net, u32 portid, | |
508 | u32 group, int code) | |
62b68e99 | 509 | { |
91398a09 JB |
510 | if (WARN_ON_ONCE(group >= family->n_mcgrps)) |
511 | return -EINVAL; | |
512 | group = family->mcgrp_offset + group; | |
62b68e99 JB |
513 | return netlink_set_err(net->genl_sock, portid, group, code); |
514 | } | |
3dabc715 | 515 | |
2ae0f17d | 516 | static inline int genl_has_listeners(const struct genl_family *family, |
f8403a2e | 517 | struct net *net, unsigned int group) |
0d566379 ND |
518 | { |
519 | if (WARN_ON_ONCE(group >= family->n_mcgrps)) | |
520 | return -EINVAL; | |
521 | group = family->mcgrp_offset + group; | |
f8403a2e | 522 | return netlink_has_listeners(net->genl_sock, group); |
0d566379 | 523 | } |
482a8524 | 524 | #endif /* __NET_GENERIC_NETLINK_H */ |