1#ifndef __NET_GENERIC_NETLINK_H
2#define __NET_GENERIC_NETLINK_H
3
4#include <linux/genetlink.h>
5#include <net/netlink.h>
6#include <net/net_namespace.h>
7
8#define GENLMSG_DEFAULT_SIZE (NLMSG_DEFAULT_SIZE - GENL_HDRLEN)
9
10
11
12
13
14
15
16
17
18struct genl_multicast_group {
19 struct genl_family *family;
20 struct list_head list;
21 char name[GENL_NAMSIZ];
22 u32 id;
23};
24
25struct genl_ops;
26struct genl_info;
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46struct genl_family {
47 unsigned int id;
48 unsigned int hdrsize;
49 char name[GENL_NAMSIZ];
50 unsigned int version;
51 unsigned int maxattr;
52 bool netnsok;
53 bool parallel_ops;
54 int (*pre_doit)(struct genl_ops *ops,
55 struct sk_buff *skb,
56 struct genl_info *info);
57 void (*post_doit)(struct genl_ops *ops,
58 struct sk_buff *skb,
59 struct genl_info *info);
60 struct nlattr ** attrbuf;
61 struct list_head ops_list;
62 struct list_head family_list;
63 struct list_head mcast_groups;
64 struct module *module;
65};
66
67
68
69
70
71
72
73
74
75
76
77
78struct genl_info {
79 u32 snd_seq;
80 u32 snd_portid;
81 struct nlmsghdr * nlhdr;
82 struct genlmsghdr * genlhdr;
83 void * userhdr;
84 struct nlattr ** attrs;
85#ifdef CONFIG_NET_NS
86 struct net * _net;
87#endif
88 void * user_ptr[2];
89};
90
91static inline struct net *genl_info_net(struct genl_info *info)
92{
93 return read_pnet(&info->_net);
94}
95
96static inline void genl_info_net_set(struct genl_info *info, struct net *net)
97{
98 write_pnet(&info->_net, net);
99}
100
101
102
103
104
105
106
107
108
109
110
111
112struct genl_ops {
113 u8 cmd;
114 u8 internal_flags;
115 unsigned int flags;
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;
123};
124
125extern int __genl_register_family(struct genl_family *family);
126
127static inline int genl_register_family(struct genl_family *family)
128{
129 family->module = THIS_MODULE;
130 return __genl_register_family(family);
131}
132
133extern int __genl_register_family_with_ops(struct genl_family *family,
134 struct genl_ops *ops, size_t n_ops);
135
136static inline int genl_register_family_with_ops(struct genl_family *family,
137 struct genl_ops *ops, size_t n_ops)
138{
139 family->module = THIS_MODULE;
140 return __genl_register_family_with_ops(family, ops, n_ops);
141}
142
143extern int genl_unregister_family(struct genl_family *family);
144extern int genl_register_ops(struct genl_family *, struct genl_ops *ops);
145extern int genl_unregister_ops(struct genl_family *, struct genl_ops *ops);
146extern int genl_register_mc_group(struct genl_family *family,
147 struct genl_multicast_group *grp);
148extern void genl_unregister_mc_group(struct genl_family *family,
149 struct genl_multicast_group *grp);
150extern void genl_notify(struct sk_buff *skb, struct net *net, u32 portid,
151 u32 group, struct nlmsghdr *nlh, gfp_t flags);
152
153void *genlmsg_put(struct sk_buff *skb, u32 portid, u32 seq,
154 struct genl_family *family, int flags, u8 cmd);
155
156
157
158
159
160
161
162
163static inline struct nlmsghdr *genlmsg_nlhdr(void *user_hdr,
164 struct genl_family *family)
165{
166 return (struct nlmsghdr *)((char *)user_hdr -
167 family->hdrsize -
168 GENL_HDRLEN -
169 NLMSG_HDRLEN);
170}
171
172
173
174
175
176
177
178
179
180
181static inline void genl_dump_check_consistent(struct netlink_callback *cb,
182 void *user_hdr,
183 struct genl_family *family)
184{
185 nl_dump_check_consistent(cb, genlmsg_nlhdr(user_hdr, family));
186}
187
188
189
190
191
192
193
194
195
196
197
198static inline void *genlmsg_put_reply(struct sk_buff *skb,
199 struct genl_info *info,
200 struct genl_family *family,
201 int flags, u8 cmd)
202{
203 return genlmsg_put(skb, info->snd_portid, info->snd_seq, family,
204 flags, cmd);
205}
206
207
208
209
210
211
212static inline int genlmsg_end(struct sk_buff *skb, void *hdr)
213{
214 return nlmsg_end(skb, hdr - GENL_HDRLEN - NLMSG_HDRLEN);
215}
216
217
218
219
220
221
222static inline void genlmsg_cancel(struct sk_buff *skb, void *hdr)
223{
224 if (hdr)
225 nlmsg_cancel(skb, hdr - GENL_HDRLEN - NLMSG_HDRLEN);
226}
227
228
229
230
231
232
233
234
235
236static inline int genlmsg_multicast_netns(struct net *net, struct sk_buff *skb,
237 u32 portid, unsigned int group, gfp_t flags)
238{
239 return nlmsg_multicast(net->genl_sock, skb, portid, group, flags);
240}
241
242
243
244
245
246
247
248
249static inline int genlmsg_multicast(struct sk_buff *skb, u32 portid,
250 unsigned int group, gfp_t flags)
251{
252 return genlmsg_multicast_netns(&init_net, skb, portid, group, flags);
253}
254
255
256
257
258
259
260
261
262
263
264int genlmsg_multicast_allns(struct sk_buff *skb, u32 portid,
265 unsigned int group, gfp_t flags);
266
267
268
269
270
271
272static inline int genlmsg_unicast(struct net *net, struct sk_buff *skb, u32 portid)
273{
274 return nlmsg_unicast(net->genl_sock, skb, portid);
275}
276
277
278
279
280
281
282static inline int genlmsg_reply(struct sk_buff *skb, struct genl_info *info)
283{
284 return genlmsg_unicast(genl_info_net(info), skb, info->snd_portid);
285}
286
287
288
289
290
291static inline void *genlmsg_data(const struct genlmsghdr *gnlh)
292{
293 return ((unsigned char *) gnlh + GENL_HDRLEN);
294}
295
296
297
298
299
300static inline int genlmsg_len(const struct genlmsghdr *gnlh)
301{
302 struct nlmsghdr *nlh = (struct nlmsghdr *)((unsigned char *)gnlh -
303 NLMSG_HDRLEN);
304 return (nlh->nlmsg_len - GENL_HDRLEN - NLMSG_HDRLEN);
305}
306
307
308
309
310
311static inline int genlmsg_msg_size(int payload)
312{
313 return GENL_HDRLEN + payload;
314}
315
316
317
318
319
320static inline int genlmsg_total_size(int payload)
321{
322 return NLMSG_ALIGN(genlmsg_msg_size(payload));
323}
324
325
326
327
328
329
330static inline struct sk_buff *genlmsg_new(size_t payload, gfp_t flags)
331{
332 return nlmsg_new(genlmsg_total_size(payload), flags);
333}
334
335
336#endif
337