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 module * owner;
26 struct nlattr ** attrbuf; /* private */
27 struct list_head ops_list; /* private */
28 struct list_head family_list; /* private */
31 #define GENL_ADMIN_PERM 0x01
34 * struct genl_info - receiving information
35 * @snd_seq: sending sequence number
36 * @snd_pid: netlink pid of sender
37 * @nlhdr: netlink message header
38 * @genlhdr: generic netlink message header
39 * @userhdr: user specific header
40 * @attrs: netlink attributes
46 struct nlmsghdr * nlhdr;
47 struct genlmsghdr * genlhdr;
49 struct nlattr ** attrs;
53 * struct genl_ops - generic netlink operations
54 * @cmd: command identifier
56 * @policy: attribute validation policy
57 * @doit: standard command callback
58 * @dumpit: callback for dumpers
59 * @ops_list: operations list
65 struct nla_policy *policy;
66 int (*doit)(struct sk_buff *skb,
67 struct genl_info *info);
68 int (*dumpit)(struct sk_buff *skb,
69 struct netlink_callback *cb);
70 struct list_head ops_list;
73 extern int genl_register_family(struct genl_family *family);
74 extern int genl_unregister_family(struct genl_family *family);
75 extern int genl_register_ops(struct genl_family *, struct genl_ops *ops);
76 extern int genl_unregister_ops(struct genl_family *, struct genl_ops *ops);
78 extern struct sock *genl_sock;
81 * genlmsg_put - Add generic netlink header to netlink message
82 * @skb: socket buffer holding the message
83 * @pid: netlink pid the message is addressed to
84 * @seq: sequence number (usually the one of the sender)
85 * @type: netlink message type
86 * @hdrlen: length of the user specific header
87 * @flags netlink message flags
88 * @cmd: generic netlink command
91 * Returns pointer to user specific header
93 static inline void *genlmsg_put(struct sk_buff *skb, u32 pid, u32 seq,
94 int type, int hdrlen, int flags,
98 struct genlmsghdr *hdr;
100 nlh = nlmsg_put(skb, pid, seq, type, GENL_HDRLEN + hdrlen, flags);
104 hdr = nlmsg_data(nlh);
106 hdr->version = version;
109 return (char *) hdr + GENL_HDRLEN;
113 * genlmsg_end - Finalize a generic netlink message
114 * @skb: socket buffer the message is stored in
115 * @hdr: user specific header
117 static inline int genlmsg_end(struct sk_buff *skb, void *hdr)
119 return nlmsg_end(skb, hdr - GENL_HDRLEN - NLMSG_HDRLEN);
123 * genlmsg_cancel - Cancel construction of a generic netlink message
124 * @skb: socket buffer the message is stored in
125 * @hdr: generic netlink message header
127 static inline int genlmsg_cancel(struct sk_buff *skb, void *hdr)
129 return nlmsg_cancel(skb, hdr - GENL_HDRLEN - NLMSG_HDRLEN);
133 * genlmsg_multicast - multicast a netlink message
134 * @skb: netlink message as socket buffer
135 * @pid: own netlink pid to avoid sending to yourself
136 * @group: multicast group id
138 static inline int genlmsg_multicast(struct sk_buff *skb, u32 pid,
141 return nlmsg_multicast(genl_sock, skb, pid, group);
145 * genlmsg_unicast - unicast a netlink message
146 * @skb: netlink message as socket buffer
147 * @pid: netlink pid of the destination socket
149 static inline int genlmsg_unicast(struct sk_buff *skb, u32 pid)
151 return nlmsg_unicast(genl_sock, skb, pid);
154 #endif /* __NET_GENERIC_NETLINK_H */