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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 | ||
7 | /** | |
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 | |
17 | */ | |
18 | struct genl_family | |
19 | { | |
20 | unsigned int id; | |
21 | unsigned int hdrsize; | |
22 | char name[GENL_NAMSIZ]; | |
23 | unsigned int version; | |
24 | unsigned int maxattr; | |
482a8524 TG |
25 | struct nlattr ** attrbuf; /* private */ |
26 | struct list_head ops_list; /* private */ | |
27 | struct list_head family_list; /* private */ | |
28 | }; | |
29 | ||
482a8524 TG |
30 | /** |
31 | * struct genl_info - receiving information | |
32 | * @snd_seq: sending sequence number | |
33 | * @snd_pid: netlink pid of sender | |
34 | * @nlhdr: netlink message header | |
35 | * @genlhdr: generic netlink message header | |
36 | * @userhdr: user specific header | |
37 | * @attrs: netlink attributes | |
38 | */ | |
39 | struct genl_info | |
40 | { | |
41 | u32 snd_seq; | |
42 | u32 snd_pid; | |
43 | struct nlmsghdr * nlhdr; | |
44 | struct genlmsghdr * genlhdr; | |
45 | void * userhdr; | |
46 | struct nlattr ** attrs; | |
47 | }; | |
48 | ||
49 | /** | |
50 | * struct genl_ops - generic netlink operations | |
51 | * @cmd: command identifier | |
52 | * @flags: flags | |
53 | * @policy: attribute validation policy | |
54 | * @doit: standard command callback | |
55 | * @dumpit: callback for dumpers | |
56 | * @ops_list: operations list | |
57 | */ | |
58 | struct genl_ops | |
59 | { | |
b461d2f2 | 60 | u8 cmd; |
482a8524 TG |
61 | unsigned int flags; |
62 | struct nla_policy *policy; | |
63 | int (*doit)(struct sk_buff *skb, | |
64 | struct genl_info *info); | |
65 | int (*dumpit)(struct sk_buff *skb, | |
66 | struct netlink_callback *cb); | |
67 | struct list_head ops_list; | |
68 | }; | |
69 | ||
70 | extern int genl_register_family(struct genl_family *family); | |
71 | extern int genl_unregister_family(struct genl_family *family); | |
72 | extern int genl_register_ops(struct genl_family *, struct genl_ops *ops); | |
73 | extern int genl_unregister_ops(struct genl_family *, struct genl_ops *ops); | |
74 | ||
75 | extern struct sock *genl_sock; | |
76 | ||
77 | /** | |
78 | * genlmsg_put - Add generic netlink header to netlink message | |
79 | * @skb: socket buffer holding the message | |
80 | * @pid: netlink pid the message is addressed to | |
81 | * @seq: sequence number (usually the one of the sender) | |
82 | * @type: netlink message type | |
83 | * @hdrlen: length of the user specific header | |
84 | * @flags netlink message flags | |
85 | * @cmd: generic netlink command | |
86 | * @version: version | |
87 | * | |
88 | * Returns pointer to user specific header | |
89 | */ | |
90 | static inline void *genlmsg_put(struct sk_buff *skb, u32 pid, u32 seq, | |
91 | int type, int hdrlen, int flags, | |
92 | u8 cmd, u8 version) | |
93 | { | |
94 | struct nlmsghdr *nlh; | |
95 | struct genlmsghdr *hdr; | |
96 | ||
97 | nlh = nlmsg_put(skb, pid, seq, type, GENL_HDRLEN + hdrlen, flags); | |
98 | if (nlh == NULL) | |
99 | return NULL; | |
100 | ||
101 | hdr = nlmsg_data(nlh); | |
102 | hdr->cmd = cmd; | |
103 | hdr->version = version; | |
104 | hdr->reserved = 0; | |
105 | ||
106 | return (char *) hdr + GENL_HDRLEN; | |
107 | } | |
108 | ||
109 | /** | |
110 | * genlmsg_end - Finalize a generic netlink message | |
111 | * @skb: socket buffer the message is stored in | |
112 | * @hdr: user specific header | |
113 | */ | |
114 | static inline int genlmsg_end(struct sk_buff *skb, void *hdr) | |
115 | { | |
116 | return nlmsg_end(skb, hdr - GENL_HDRLEN - NLMSG_HDRLEN); | |
117 | } | |
118 | ||
119 | /** | |
120 | * genlmsg_cancel - Cancel construction of a generic netlink message | |
121 | * @skb: socket buffer the message is stored in | |
122 | * @hdr: generic netlink message header | |
123 | */ | |
124 | static inline int genlmsg_cancel(struct sk_buff *skb, void *hdr) | |
125 | { | |
126 | return nlmsg_cancel(skb, hdr - GENL_HDRLEN - NLMSG_HDRLEN); | |
127 | } | |
128 | ||
129 | /** | |
130 | * genlmsg_multicast - multicast a netlink message | |
131 | * @skb: netlink message as socket buffer | |
132 | * @pid: own netlink pid to avoid sending to yourself | |
133 | * @group: multicast group id | |
d387f6ad | 134 | * @flags: allocation flags |
482a8524 TG |
135 | */ |
136 | static inline int genlmsg_multicast(struct sk_buff *skb, u32 pid, | |
d387f6ad | 137 | unsigned int group, gfp_t flags) |
482a8524 | 138 | { |
d387f6ad | 139 | return nlmsg_multicast(genl_sock, skb, pid, group, flags); |
482a8524 TG |
140 | } |
141 | ||
142 | /** | |
143 | * genlmsg_unicast - unicast a netlink message | |
144 | * @skb: netlink message as socket buffer | |
145 | * @pid: netlink pid of the destination socket | |
146 | */ | |
147 | static inline int genlmsg_unicast(struct sk_buff *skb, u32 pid) | |
148 | { | |
149 | return nlmsg_unicast(genl_sock, skb, pid); | |
150 | } | |
151 | ||
81878d27 TG |
152 | /** |
153 | * genlmsg_reply - reply to a request | |
154 | * @skb: netlink message to be sent back | |
155 | * @info: receiver information | |
156 | */ | |
157 | static inline int genlmsg_reply(struct sk_buff *skb, struct genl_info *info) | |
158 | { | |
159 | return genlmsg_unicast(skb, info->snd_pid); | |
160 | } | |
161 | ||
fb0ba6bd BS |
162 | /** |
163 | * gennlmsg_data - head of message payload | |
164 | * @gnlh: genetlink messsage header | |
165 | */ | |
166 | static inline void *genlmsg_data(const struct genlmsghdr *gnlh) | |
167 | { | |
168 | return ((unsigned char *) gnlh + GENL_HDRLEN); | |
169 | } | |
170 | ||
171 | /** | |
172 | * genlmsg_len - length of message payload | |
173 | * @gnlh: genetlink message header | |
174 | */ | |
175 | static inline int genlmsg_len(const struct genlmsghdr *gnlh) | |
176 | { | |
177 | struct nlmsghdr *nlh = (struct nlmsghdr *)((unsigned char *)gnlh - | |
178 | NLMSG_HDRLEN); | |
179 | return (nlh->nlmsg_len - GENL_HDRLEN - NLMSG_HDRLEN); | |
180 | } | |
181 | ||
17db952c BS |
182 | /** |
183 | * genlmsg_msg_size - length of genetlink message not including padding | |
184 | * @payload: length of message payload | |
185 | */ | |
186 | static inline int genlmsg_msg_size(int payload) | |
187 | { | |
188 | return GENL_HDRLEN + payload; | |
189 | } | |
190 | ||
191 | /** | |
192 | * genlmsg_total_size - length of genetlink message including padding | |
193 | * @payload: length of message payload | |
194 | */ | |
195 | static inline int genlmsg_total_size(int payload) | |
196 | { | |
197 | return NLMSG_ALIGN(genlmsg_msg_size(payload)); | |
198 | } | |
199 | ||
3dabc715 TG |
200 | /** |
201 | * genlmsg_new - Allocate a new generic netlink message | |
202 | * @payload: size of the message payload | |
203 | * @flags: the type of memory to allocate. | |
204 | */ | |
205 | static inline struct sk_buff *genlmsg_new(size_t payload, gfp_t flags) | |
206 | { | |
207 | return nlmsg_new(genlmsg_total_size(payload), flags); | |
208 | } | |
209 | ||
210 | ||
482a8524 | 211 | #endif /* __NET_GENERIC_NETLINK_H */ |