1 #ifndef __NET_GENERIC_NETLINK_H
2 #define __NET_GENERIC_NETLINK_H
4 #include <linux/genetlink.h>
5 #include <net/netlink.h>
8 * struct genl_family - generic netlink family
9 * @id: protocol family idenfitier
10 * @hdrsize: length of user specific header in bytes
11 * @name: name of family
12 * @version: protocol version
13 * @maxattr: maximum number of attributes supported
14 * @attrbuf: buffer to store parsed attributes
15 * @ops_list: list of all assigned operations
16 * @family_list: family list
22 char name
[GENL_NAMSIZ
];
25 struct nlattr
** attrbuf
; /* private */
26 struct list_head ops_list
; /* private */
27 struct list_head family_list
; /* private */
31 * struct genl_info - receiving information
32 * @snd_seq: sending sequence number
33 * @snd_pid: netlink pid of sender
34 * @nlhdr: netlink message header
35 * @genlhdr: generic netlink message header
36 * @userhdr: user specific header
37 * @attrs: netlink attributes
43 struct nlmsghdr
* nlhdr
;
44 struct genlmsghdr
* genlhdr
;
46 struct nlattr
** attrs
;
50 * struct genl_ops - generic netlink operations
51 * @cmd: command identifier
53 * @policy: attribute validation policy
54 * @doit: standard command callback
55 * @dumpit: callback for dumpers
56 * @ops_list: operations list
62 struct nla_policy
*policy
;
63 int (*doit
)(struct sk_buff
*skb
,
64 struct genl_info
*info
);
65 int (*dumpit
)(struct sk_buff
*skb
,
66 struct netlink_callback
*cb
);
67 struct list_head ops_list
;
70 extern int genl_register_family(struct genl_family
*family
);
71 extern int genl_unregister_family(struct genl_family
*family
);
72 extern int genl_register_ops(struct genl_family
*, struct genl_ops
*ops
);
73 extern int genl_unregister_ops(struct genl_family
*, struct genl_ops
*ops
);
75 extern struct sock
*genl_sock
;
78 * genlmsg_put - Add generic netlink header to netlink message
79 * @skb: socket buffer holding the message
80 * @pid: netlink pid the message is addressed to
81 * @seq: sequence number (usually the one of the sender)
82 * @type: netlink message type
83 * @hdrlen: length of the user specific header
84 * @flags netlink message flags
85 * @cmd: generic netlink command
88 * Returns pointer to user specific header
90 static inline void *genlmsg_put(struct sk_buff
*skb
, u32 pid
, u32 seq
,
91 int type
, int hdrlen
, int flags
,
95 struct genlmsghdr
*hdr
;
97 nlh
= nlmsg_put(skb
, pid
, seq
, type
, GENL_HDRLEN
+ hdrlen
, flags
);
101 hdr
= nlmsg_data(nlh
);
103 hdr
->version
= version
;
106 return (char *) hdr
+ GENL_HDRLEN
;
110 * genlmsg_end - Finalize a generic netlink message
111 * @skb: socket buffer the message is stored in
112 * @hdr: user specific header
114 static inline int genlmsg_end(struct sk_buff
*skb
, void *hdr
)
116 return nlmsg_end(skb
, hdr
- GENL_HDRLEN
- NLMSG_HDRLEN
);
120 * genlmsg_cancel - Cancel construction of a generic netlink message
121 * @skb: socket buffer the message is stored in
122 * @hdr: generic netlink message header
124 static inline int genlmsg_cancel(struct sk_buff
*skb
, void *hdr
)
126 return nlmsg_cancel(skb
, hdr
- GENL_HDRLEN
- NLMSG_HDRLEN
);
130 * genlmsg_multicast - multicast a netlink message
131 * @skb: netlink message as socket buffer
132 * @pid: own netlink pid to avoid sending to yourself
133 * @group: multicast group id
134 * @flags: allocation flags
136 static inline int genlmsg_multicast(struct sk_buff
*skb
, u32 pid
,
137 unsigned int group
, gfp_t flags
)
139 return nlmsg_multicast(genl_sock
, skb
, pid
, group
, flags
);
143 * genlmsg_unicast - unicast a netlink message
144 * @skb: netlink message as socket buffer
145 * @pid: netlink pid of the destination socket
147 static inline int genlmsg_unicast(struct sk_buff
*skb
, u32 pid
)
149 return nlmsg_unicast(genl_sock
, skb
, pid
);
153 * gennlmsg_data - head of message payload
154 * @gnlh: genetlink messsage header
156 static inline void *genlmsg_data(const struct genlmsghdr
*gnlh
)
158 return ((unsigned char *) gnlh
+ GENL_HDRLEN
);
162 * genlmsg_len - length of message payload
163 * @gnlh: genetlink message header
165 static inline int genlmsg_len(const struct genlmsghdr
*gnlh
)
167 struct nlmsghdr
*nlh
= (struct nlmsghdr
*)((unsigned char *)gnlh
-
169 return (nlh
->nlmsg_len
- GENL_HDRLEN
- NLMSG_HDRLEN
);
173 * genlmsg_msg_size - length of genetlink message not including padding
174 * @payload: length of message payload
176 static inline int genlmsg_msg_size(int payload
)
178 return GENL_HDRLEN
+ payload
;
182 * genlmsg_total_size - length of genetlink message including padding
183 * @payload: length of message payload
185 static inline int genlmsg_total_size(int payload
)
187 return NLMSG_ALIGN(genlmsg_msg_size(payload
));
190 #endif /* __NET_GENERIC_NETLINK_H */