1 #ifndef __NET_GENERIC_NETLINK_H
2 #define __NET_GENERIC_NETLINK_H
4 #include <linux/genetlink.h>
5 #include <net/netlink.h>
6 #include <net/net_namespace.h>
8 #define GENLMSG_DEFAULT_SIZE (NLMSG_DEFAULT_SIZE - GENL_HDRLEN)
11 * struct genl_multicast_group - generic netlink multicast group
12 * @name: name of the multicast group, names are per-family
13 * @id: multicast group ID, assigned by the core, to use with
14 * genlmsg_multicast().
15 * @list: list entry for linking
16 * @family: pointer to family, need not be set before registering
18 struct genl_multicast_group
{
19 struct genl_family
*family
; /* private */
20 struct list_head list
; /* private */
21 char name
[GENL_NAMSIZ
];
29 * struct genl_family - generic netlink family
30 * @id: protocol family idenfitier
31 * @hdrsize: length of user specific header in bytes
32 * @name: name of family
33 * @version: protocol version
34 * @maxattr: maximum number of attributes supported
35 * @netnsok: set to true if the family can handle network
36 * namespaces and should be presented in all of them
37 * @pre_doit: called before an operation's doit callback, it may
38 * do additional, common, filtering and return an error
39 * @post_doit: called after an operation's doit callback, it may
40 * undo operations done by pre_doit, for example release locks
41 * @attrbuf: buffer to store parsed attributes
42 * @ops_list: list of all assigned operations
43 * @family_list: family list
44 * @mcast_groups: multicast groups list
49 char name
[GENL_NAMSIZ
];
54 int (*pre_doit
)(struct genl_ops
*ops
,
56 struct genl_info
*info
);
57 void (*post_doit
)(struct genl_ops
*ops
,
59 struct genl_info
*info
);
60 struct nlattr
** attrbuf
; /* private */
61 struct list_head ops_list
; /* private */
62 struct list_head family_list
; /* private */
63 struct list_head mcast_groups
; /* private */
64 struct module
*module
;
68 * struct genl_info - receiving information
69 * @snd_seq: sending sequence number
70 * @snd_portid: netlink portid of sender
71 * @nlhdr: netlink message header
72 * @genlhdr: generic netlink message header
73 * @userhdr: user specific header
74 * @attrs: netlink attributes
75 * @_net: network namespace
76 * @user_ptr: user pointers
81 struct nlmsghdr
* nlhdr
;
82 struct genlmsghdr
* genlhdr
;
84 struct nlattr
** attrs
;
91 static inline struct net
*genl_info_net(struct genl_info
*info
)
93 return read_pnet(&info
->_net
);
96 static inline void genl_info_net_set(struct genl_info
*info
, struct net
*net
)
98 write_pnet(&info
->_net
, net
);
102 * struct genl_ops - generic netlink operations
103 * @cmd: command identifier
104 * @internal_flags: flags used by the family
106 * @policy: attribute validation policy
107 * @doit: standard command callback
108 * @dumpit: callback for dumpers
109 * @done: completion callback for dumps
110 * @ops_list: operations list
116 const struct nla_policy
*policy
;
117 int (*doit
)(struct sk_buff
*skb
,
118 struct genl_info
*info
);
119 int (*dumpit
)(struct sk_buff
*skb
,
120 struct netlink_callback
*cb
);
121 int (*done
)(struct netlink_callback
*cb
);
122 struct list_head ops_list
;
125 extern int __genl_register_family(struct genl_family
*family
);
127 static inline int genl_register_family(struct genl_family
*family
)
129 family
->module
= THIS_MODULE
;
130 return __genl_register_family(family
);
133 extern int __genl_register_family_with_ops(struct genl_family
*family
,
134 struct genl_ops
*ops
, size_t n_ops
);
136 static inline int genl_register_family_with_ops(struct genl_family
*family
,
137 struct genl_ops
*ops
, size_t n_ops
)
139 family
->module
= THIS_MODULE
;
140 return __genl_register_family_with_ops(family
, ops
, n_ops
);
143 extern int genl_unregister_family(struct genl_family
*family
);
144 extern int genl_register_ops(struct genl_family
*, struct genl_ops
*ops
);
145 extern int genl_unregister_ops(struct genl_family
*, struct genl_ops
*ops
);
146 extern int genl_register_mc_group(struct genl_family
*family
,
147 struct genl_multicast_group
*grp
);
148 extern void genl_unregister_mc_group(struct genl_family
*family
,
149 struct genl_multicast_group
*grp
);
150 extern void genl_notify(struct sk_buff
*skb
, struct net
*net
, u32 portid
,
151 u32 group
, struct nlmsghdr
*nlh
, gfp_t flags
);
153 void *genlmsg_put(struct sk_buff
*skb
, u32 portid
, u32 seq
,
154 struct genl_family
*family
, int flags
, u8 cmd
);
157 * genlmsg_nlhdr - Obtain netlink header from user specified header
158 * @user_hdr: user header as returned from genlmsg_put()
159 * @family: generic netlink family
161 * Returns pointer to netlink header.
163 static inline struct nlmsghdr
*genlmsg_nlhdr(void *user_hdr
,
164 struct genl_family
*family
)
166 return (struct nlmsghdr
*)((char *)user_hdr
-
173 * genl_dump_check_consistent - check if sequence is consistent and advertise if not
174 * @cb: netlink callback structure that stores the sequence number
175 * @user_hdr: user header as returned from genlmsg_put()
176 * @family: generic netlink family
178 * Cf. nl_dump_check_consistent(), this just provides a wrapper to make it
179 * simpler to use with generic netlink.
181 static inline void genl_dump_check_consistent(struct netlink_callback
*cb
,
183 struct genl_family
*family
)
185 nl_dump_check_consistent(cb
, genlmsg_nlhdr(user_hdr
, family
));
189 * genlmsg_put_reply - Add generic netlink header to a reply message
190 * @skb: socket buffer holding the message
191 * @info: receiver info
192 * @family: generic netlink family
193 * @flags: netlink message flags
194 * @cmd: generic netlink command
196 * Returns pointer to user specific header
198 static inline void *genlmsg_put_reply(struct sk_buff
*skb
,
199 struct genl_info
*info
,
200 struct genl_family
*family
,
203 return genlmsg_put(skb
, info
->snd_portid
, info
->snd_seq
, family
,
208 * genlmsg_end - Finalize a generic netlink message
209 * @skb: socket buffer the message is stored in
210 * @hdr: user specific header
212 static inline int genlmsg_end(struct sk_buff
*skb
, void *hdr
)
214 return nlmsg_end(skb
, hdr
- GENL_HDRLEN
- NLMSG_HDRLEN
);
218 * genlmsg_cancel - Cancel construction of a generic netlink message
219 * @skb: socket buffer the message is stored in
220 * @hdr: generic netlink message header
222 static inline void genlmsg_cancel(struct sk_buff
*skb
, void *hdr
)
225 nlmsg_cancel(skb
, hdr
- GENL_HDRLEN
- NLMSG_HDRLEN
);
229 * genlmsg_multicast_netns - multicast a netlink message to a specific netns
230 * @net: the net namespace
231 * @skb: netlink message as socket buffer
232 * @portid: own netlink portid to avoid sending to yourself
233 * @group: multicast group id
234 * @flags: allocation flags
236 static inline int genlmsg_multicast_netns(struct net
*net
, struct sk_buff
*skb
,
237 u32 portid
, unsigned int group
, gfp_t flags
)
239 return nlmsg_multicast(net
->genl_sock
, skb
, portid
, group
, flags
);
243 * genlmsg_multicast - multicast a netlink message to the default netns
244 * @skb: netlink message as socket buffer
245 * @portid: own netlink portid to avoid sending to yourself
246 * @group: multicast group id
247 * @flags: allocation flags
249 static inline int genlmsg_multicast(struct sk_buff
*skb
, u32 portid
,
250 unsigned int group
, gfp_t flags
)
252 return genlmsg_multicast_netns(&init_net
, skb
, portid
, group
, flags
);
256 * genlmsg_multicast_allns - multicast a netlink message to all net namespaces
257 * @skb: netlink message as socket buffer
258 * @portid: own netlink portid to avoid sending to yourself
259 * @group: multicast group id
260 * @flags: allocation flags
262 * This function must hold the RTNL or rcu_read_lock().
264 int genlmsg_multicast_allns(struct sk_buff
*skb
, u32 portid
,
265 unsigned int group
, gfp_t flags
);
268 * genlmsg_unicast - unicast a netlink message
269 * @skb: netlink message as socket buffer
270 * @portid: netlink portid of the destination socket
272 static inline int genlmsg_unicast(struct net
*net
, struct sk_buff
*skb
, u32 portid
)
274 return nlmsg_unicast(net
->genl_sock
, skb
, portid
);
278 * genlmsg_reply - reply to a request
279 * @skb: netlink message to be sent back
280 * @info: receiver information
282 static inline int genlmsg_reply(struct sk_buff
*skb
, struct genl_info
*info
)
284 return genlmsg_unicast(genl_info_net(info
), skb
, info
->snd_portid
);
288 * gennlmsg_data - head of message payload
289 * @gnlh: genetlink message header
291 static inline void *genlmsg_data(const struct genlmsghdr
*gnlh
)
293 return ((unsigned char *) gnlh
+ GENL_HDRLEN
);
297 * genlmsg_len - length of message payload
298 * @gnlh: genetlink message header
300 static inline int genlmsg_len(const struct genlmsghdr
*gnlh
)
302 struct nlmsghdr
*nlh
= (struct nlmsghdr
*)((unsigned char *)gnlh
-
304 return (nlh
->nlmsg_len
- GENL_HDRLEN
- NLMSG_HDRLEN
);
308 * genlmsg_msg_size - length of genetlink message not including padding
309 * @payload: length of message payload
311 static inline int genlmsg_msg_size(int payload
)
313 return GENL_HDRLEN
+ payload
;
317 * genlmsg_total_size - length of genetlink message including padding
318 * @payload: length of message payload
320 static inline int genlmsg_total_size(int payload
)
322 return NLMSG_ALIGN(genlmsg_msg_size(payload
));
326 * genlmsg_new - Allocate a new generic netlink message
327 * @payload: size of the message payload
328 * @flags: the type of memory to allocate.
330 static inline struct sk_buff
*genlmsg_new(size_t payload
, gfp_t flags
)
332 return nlmsg_new(genlmsg_total_size(payload
), flags
);
336 #endif /* __NET_GENERIC_NETLINK_H */