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482a8524 TG |
1 | #ifndef __NET_GENERIC_NETLINK_H |
2 | #define __NET_GENERIC_NETLINK_H | |
3 | ||
4 | #include <linux/genetlink.h> | |
5 | #include <net/netlink.h> | |
6 | ||
2dbba6f7 JB |
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 | ||
482a8524 TG |
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 | |
2dbba6f7 | 33 | * @mcast_groups: multicast groups list |
482a8524 TG |
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; | |
482a8524 TG |
42 | struct nlattr ** attrbuf; /* private */ |
43 | struct list_head ops_list; /* private */ | |
44 | struct list_head family_list; /* private */ | |
2dbba6f7 | 45 | struct list_head mcast_groups; /* private */ |
482a8524 TG |
46 | }; |
47 | ||
482a8524 TG |
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 | |
a4d1366d | 74 | * @done: completion callback for dumps |
482a8524 TG |
75 | * @ops_list: operations list |
76 | */ | |
77 | struct genl_ops | |
78 | { | |
b461d2f2 | 79 | u8 cmd; |
482a8524 | 80 | unsigned int flags; |
ef7c79ed | 81 | const struct nla_policy *policy; |
482a8524 TG |
82 | int (*doit)(struct sk_buff *skb, |
83 | struct genl_info *info); | |
84 | int (*dumpit)(struct sk_buff *skb, | |
85 | struct netlink_callback *cb); | |
a4d1366d | 86 | int (*done)(struct netlink_callback *cb); |
482a8524 TG |
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); | |
2dbba6f7 JB |
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); | |
482a8524 TG |
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) | |
17c157c8 | 106 | * @family: generic netlink family |
482a8524 TG |
107 | * @flags netlink message flags |
108 | * @cmd: generic netlink command | |
482a8524 TG |
109 | * |
110 | * Returns pointer to user specific header | |
111 | */ | |
112 | static inline void *genlmsg_put(struct sk_buff *skb, u32 pid, u32 seq, | |
17c157c8 | 113 | struct genl_family *family, int flags, u8 cmd) |
482a8524 TG |
114 | { |
115 | struct nlmsghdr *nlh; | |
116 | struct genlmsghdr *hdr; | |
117 | ||
17c157c8 TG |
118 | nlh = nlmsg_put(skb, pid, seq, family->id, GENL_HDRLEN + |
119 | family->hdrsize, flags); | |
482a8524 TG |
120 | if (nlh == NULL) |
121 | return NULL; | |
122 | ||
123 | hdr = nlmsg_data(nlh); | |
124 | hdr->cmd = cmd; | |
17c157c8 | 125 | hdr->version = family->version; |
482a8524 TG |
126 | hdr->reserved = 0; |
127 | ||
128 | return (char *) hdr + GENL_HDRLEN; | |
129 | } | |
130 | ||
17c157c8 TG |
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 | ||
482a8524 TG |
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 | */ | |
bc3ed28c | 165 | static inline void genlmsg_cancel(struct sk_buff *skb, void *hdr) |
482a8524 | 166 | { |
bc3ed28c | 167 | nlmsg_cancel(skb, hdr - GENL_HDRLEN - NLMSG_HDRLEN); |
482a8524 TG |
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 | |
d387f6ad | 175 | * @flags: allocation flags |
482a8524 TG |
176 | */ |
177 | static inline int genlmsg_multicast(struct sk_buff *skb, u32 pid, | |
d387f6ad | 178 | unsigned int group, gfp_t flags) |
482a8524 | 179 | { |
d387f6ad | 180 | return nlmsg_multicast(genl_sock, skb, pid, group, flags); |
482a8524 TG |
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 | ||
81878d27 TG |
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 | ||
fb0ba6bd BS |
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 | ||
17db952c BS |
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 | ||
3dabc715 TG |
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 | ||
482a8524 | 252 | #endif /* __NET_GENERIC_NETLINK_H */ |