1 #ifndef __NET_GENERIC_NETLINK_H
2 #define __NET_GENERIC_NETLINK_H
3
4 #include <linux/genetlink.h>
5 #include <net/netlink.h>
6
7 /**
8 * struct genl_multicast_group - generic netlink multicast group
9 * @name: name of the multicast group, names are per-family
10 * @id: multicast group ID, assigned by the core, to use with
11 * genlmsg_multicast().
12 * @list: list entry for linking
13 * @family: pointer to family, need not be set before registering
14 */
15 struct genl_multicast_group
16 {
17 struct genl_family *family; /* private */
18 struct list_head list; /* private */
19 char name[GENL_NAMSIZ];
20 u32 id;
21 };
22
23 /**
24 * struct genl_family - generic netlink family
25 * @id: protocol family idenfitier
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
30 * @attrbuf: buffer to store parsed attributes
31 * @ops_list: list of all assigned operations
32 * @family_list: family list
33 * @mcast_groups: multicast groups list
34 */
35 struct genl_family
36 {
37 unsigned int id;
38 unsigned int hdrsize;
39 char name[GENL_NAMSIZ];
40 unsigned int version;
41 unsigned int maxattr;
42 struct nlattr ** attrbuf; /* private */
43 struct list_head ops_list; /* private */
44 struct list_head family_list; /* private */
45 struct list_head mcast_groups; /* private */
46 };
47
48 /**
49 * struct genl_info - receiving information
50 * @snd_seq: sending sequence number
51 * @snd_pid: netlink pid of sender
52 * @nlhdr: netlink message header
53 * @genlhdr: generic netlink message header
54 * @userhdr: user specific header
55 * @attrs: netlink attributes
56 */
57 struct genl_info
58 {
59 u32 snd_seq;
60 u32 snd_pid;
61 struct nlmsghdr * nlhdr;
62 struct genlmsghdr * genlhdr;
63 void * userhdr;
64 struct nlattr ** attrs;
65 };
66
67 /**
68 * struct genl_ops - generic netlink operations
69 * @cmd: command identifier
70 * @flags: flags
71 * @policy: attribute validation policy
72 * @doit: standard command callback
73 * @dumpit: callback for dumpers
74 * @done: completion callback for dumps
75 * @ops_list: operations list
76 */
77 struct genl_ops
78 {
79 u8 cmd;
80 unsigned int flags;
81 const struct nla_policy *policy;
82 int (*doit)(struct sk_buff *skb,
83 struct genl_info *info);
84 int (*dumpit)(struct sk_buff *skb,
85 struct netlink_callback *cb);
86 int (*done)(struct netlink_callback *cb);
87 struct list_head ops_list;
88 };
89
90 extern int genl_register_family(struct genl_family *family);
91 extern int genl_unregister_family(struct genl_family *family);
92 extern int genl_register_ops(struct genl_family *, struct genl_ops *ops);
93 extern int genl_unregister_ops(struct genl_family *, struct genl_ops *ops);
94 extern int genl_register_mc_group(struct genl_family *family,
95 struct genl_multicast_group *grp);
96 extern void genl_unregister_mc_group(struct genl_family *family,
97 struct genl_multicast_group *grp);
98
99 extern struct sock *genl_sock;
100
101 /**
102 * genlmsg_put - Add generic netlink header to netlink message
103 * @skb: socket buffer holding the message
104 * @pid: netlink pid the message is addressed to
105 * @seq: sequence number (usually the one of the sender)
106 * @family: generic netlink family
107 * @flags netlink message flags
108 * @cmd: generic netlink command
109 *
110 * Returns pointer to user specific header
111 */
112 static inline void *genlmsg_put(struct sk_buff *skb, u32 pid, u32 seq,
113 struct genl_family *family, int flags, u8 cmd)
114 {
115 struct nlmsghdr *nlh;
116 struct genlmsghdr *hdr;
117
118 nlh = nlmsg_put(skb, pid, seq, family->id, GENL_HDRLEN +
119 family->hdrsize, flags);
120 if (nlh == NULL)
121 return NULL;
122
123 hdr = nlmsg_data(nlh);
124 hdr->cmd = cmd;
125 hdr->version = family->version;
126 hdr->reserved = 0;
127
128 return (char *) hdr + GENL_HDRLEN;
129 }
130
131 /**
132 * genlmsg_put_reply - Add generic netlink header to a reply message
133 * @skb: socket buffer holding the message
134 * @info: receiver info
135 * @family: generic netlink family
136 * @flags: netlink message flags
137 * @cmd: generic netlink command
138 *
139 * Returns pointer to user specific header
140 */
141 static inline void *genlmsg_put_reply(struct sk_buff *skb,
142 struct genl_info *info,
143 struct genl_family *family,
144 int flags, u8 cmd)
145 {
146 return genlmsg_put(skb, info->snd_pid, info->snd_seq, family,
147 flags, cmd);
148 }
149
150 /**
151 * genlmsg_end - Finalize a generic netlink message
152 * @skb: socket buffer the message is stored in
153 * @hdr: user specific header
154 */
155 static inline int genlmsg_end(struct sk_buff *skb, void *hdr)
156 {
157 return nlmsg_end(skb, hdr - GENL_HDRLEN - NLMSG_HDRLEN);
158 }
159
160 /**
161 * genlmsg_cancel - Cancel construction of a generic netlink message
162 * @skb: socket buffer the message is stored in
163 * @hdr: generic netlink message header
164 */
165 static inline int genlmsg_cancel(struct sk_buff *skb, void *hdr)
166 {
167 return nlmsg_cancel(skb, hdr - GENL_HDRLEN - NLMSG_HDRLEN);
168 }
169
170 /**
171 * genlmsg_multicast - multicast a netlink message
172 * @skb: netlink message as socket buffer
173 * @pid: own netlink pid to avoid sending to yourself
174 * @group: multicast group id
175 * @flags: allocation flags
176 */
177 static inline int genlmsg_multicast(struct sk_buff *skb, u32 pid,
178 unsigned int group, gfp_t flags)
179 {
180 return nlmsg_multicast(genl_sock, skb, pid, group, flags);
181 }
182
183 /**
184 * genlmsg_unicast - unicast a netlink message
185 * @skb: netlink message as socket buffer
186 * @pid: netlink pid of the destination socket
187 */
188 static inline int genlmsg_unicast(struct sk_buff *skb, u32 pid)
189 {
190 return nlmsg_unicast(genl_sock, skb, pid);
191 }
192
193 /**
194 * genlmsg_reply - reply to a request
195 * @skb: netlink message to be sent back
196 * @info: receiver information
197 */
198 static inline int genlmsg_reply(struct sk_buff *skb, struct genl_info *info)
199 {
200 return genlmsg_unicast(skb, info->snd_pid);
201 }
202
203 /**
204 * gennlmsg_data - head of message payload
205 * @gnlh: genetlink messsage header
206 */
207 static inline void *genlmsg_data(const struct genlmsghdr *gnlh)
208 {
209 return ((unsigned char *) gnlh + GENL_HDRLEN);
210 }
211
212 /**
213 * genlmsg_len - length of message payload
214 * @gnlh: genetlink message header
215 */
216 static inline int genlmsg_len(const struct genlmsghdr *gnlh)
217 {
218 struct nlmsghdr *nlh = (struct nlmsghdr *)((unsigned char *)gnlh -
219 NLMSG_HDRLEN);
220 return (nlh->nlmsg_len - GENL_HDRLEN - NLMSG_HDRLEN);
221 }
222
223 /**
224 * genlmsg_msg_size - length of genetlink message not including padding
225 * @payload: length of message payload
226 */
227 static inline int genlmsg_msg_size(int payload)
228 {
229 return GENL_HDRLEN + payload;
230 }
231
232 /**
233 * genlmsg_total_size - length of genetlink message including padding
234 * @payload: length of message payload
235 */
236 static inline int genlmsg_total_size(int payload)
237 {
238 return NLMSG_ALIGN(genlmsg_msg_size(payload));
239 }
240
241 /**
242 * genlmsg_new - Allocate a new generic netlink message
243 * @payload: size of the message payload
244 * @flags: the type of memory to allocate.
245 */
246 static inline struct sk_buff *genlmsg_new(size_t payload, gfp_t flags)
247 {
248 return nlmsg_new(genlmsg_total_size(payload), flags);
249 }
250
251
252 #endif /* __NET_GENERIC_NETLINK_H */
253
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