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 */
30 #define GENL_ADMIN_PERM 0x01
33 * struct genl_info - receiving information
34 * @snd_seq: sending sequence number
35 * @snd_pid: netlink pid of sender
36 * @nlhdr: netlink message header
37 * @genlhdr: generic netlink message header
38 * @userhdr: user specific header
39 * @attrs: netlink attributes
45 struct nlmsghdr * nlhdr;
46 struct genlmsghdr * genlhdr;
48 struct nlattr ** attrs;
52 * struct genl_ops - generic netlink operations
53 * @cmd: command identifier
55 * @policy: attribute validation policy
56 * @doit: standard command callback
57 * @dumpit: callback for dumpers
58 * @ops_list: operations list
64 struct nla_policy *policy;
65 int (*doit)(struct sk_buff *skb,
66 struct genl_info *info);
67 int (*dumpit)(struct sk_buff *skb,
68 struct netlink_callback *cb);
69 struct list_head ops_list;
72 extern int genl_register_family(struct genl_family *family);
73 extern int genl_unregister_family(struct genl_family *family);
74 extern int genl_register_ops(struct genl_family *, struct genl_ops *ops);
75 extern int genl_unregister_ops(struct genl_family *, struct genl_ops *ops);
77 extern struct sock *genl_sock;
80 * genlmsg_put - Add generic netlink header to netlink message
81 * @skb: socket buffer holding the message
82 * @pid: netlink pid the message is addressed to
83 * @seq: sequence number (usually the one of the sender)
84 * @type: netlink message type
85 * @hdrlen: length of the user specific header
86 * @flags netlink message flags
87 * @cmd: generic netlink command
90 * Returns pointer to user specific header
92 static inline void *genlmsg_put(struct sk_buff *skb, u32 pid, u32 seq,
93 int type, int hdrlen, int flags,
97 struct genlmsghdr *hdr;
99 nlh = nlmsg_put(skb, pid, seq, type, GENL_HDRLEN + hdrlen, flags);
103 hdr = nlmsg_data(nlh);
105 hdr->version = version;
108 return (char *) hdr + GENL_HDRLEN;
112 * genlmsg_end - Finalize a generic netlink message
113 * @skb: socket buffer the message is stored in
114 * @hdr: user specific header
116 static inline int genlmsg_end(struct sk_buff *skb, void *hdr)
118 return nlmsg_end(skb, hdr - GENL_HDRLEN - NLMSG_HDRLEN);
122 * genlmsg_cancel - Cancel construction of a generic netlink message
123 * @skb: socket buffer the message is stored in
124 * @hdr: generic netlink message header
126 static inline int genlmsg_cancel(struct sk_buff *skb, void *hdr)
128 return nlmsg_cancel(skb, hdr - GENL_HDRLEN - NLMSG_HDRLEN);
132 * genlmsg_multicast - multicast a netlink message
133 * @skb: netlink message as socket buffer
134 * @pid: own netlink pid to avoid sending to yourself
135 * @group: multicast group id
137 static inline int genlmsg_multicast(struct sk_buff *skb, u32 pid,
140 return nlmsg_multicast(genl_sock, skb, pid, group);
144 * genlmsg_unicast - unicast a netlink message
145 * @skb: netlink message as socket buffer
146 * @pid: netlink pid of the destination socket
148 static inline int genlmsg_unicast(struct sk_buff *skb, u32 pid)
150 return nlmsg_unicast(genl_sock, skb, pid);
153 #endif /* __NET_GENERIC_NETLINK_H */