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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; | |
25 | struct module * owner; | |
26 | struct nlattr ** attrbuf; /* private */ | |
27 | struct list_head ops_list; /* private */ | |
28 | struct list_head family_list; /* private */ | |
29 | }; | |
30 | ||
31 | #define GENL_ADMIN_PERM 0x01 | |
32 | ||
33 | /** | |
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 | |
41 | */ | |
42 | struct genl_info | |
43 | { | |
44 | u32 snd_seq; | |
45 | u32 snd_pid; | |
46 | struct nlmsghdr * nlhdr; | |
47 | struct genlmsghdr * genlhdr; | |
48 | void * userhdr; | |
49 | struct nlattr ** attrs; | |
50 | }; | |
51 | ||
52 | /** | |
53 | * struct genl_ops - generic netlink operations | |
54 | * @cmd: command identifier | |
55 | * @flags: flags | |
56 | * @policy: attribute validation policy | |
57 | * @doit: standard command callback | |
58 | * @dumpit: callback for dumpers | |
59 | * @ops_list: operations list | |
60 | */ | |
61 | struct genl_ops | |
62 | { | |
b461d2f2 | 63 | u8 cmd; |
482a8524 TG |
64 | unsigned int flags; |
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; | |
71 | }; | |
72 | ||
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); | |
77 | ||
78 | extern struct sock *genl_sock; | |
79 | ||
80 | /** | |
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 | |
89 | * @version: version | |
90 | * | |
91 | * Returns pointer to user specific header | |
92 | */ | |
93 | static inline void *genlmsg_put(struct sk_buff *skb, u32 pid, u32 seq, | |
94 | int type, int hdrlen, int flags, | |
95 | u8 cmd, u8 version) | |
96 | { | |
97 | struct nlmsghdr *nlh; | |
98 | struct genlmsghdr *hdr; | |
99 | ||
100 | nlh = nlmsg_put(skb, pid, seq, type, GENL_HDRLEN + hdrlen, flags); | |
101 | if (nlh == NULL) | |
102 | return NULL; | |
103 | ||
104 | hdr = nlmsg_data(nlh); | |
105 | hdr->cmd = cmd; | |
106 | hdr->version = version; | |
107 | hdr->reserved = 0; | |
108 | ||
109 | return (char *) hdr + GENL_HDRLEN; | |
110 | } | |
111 | ||
112 | /** | |
113 | * genlmsg_end - Finalize a generic netlink message | |
114 | * @skb: socket buffer the message is stored in | |
115 | * @hdr: user specific header | |
116 | */ | |
117 | static inline int genlmsg_end(struct sk_buff *skb, void *hdr) | |
118 | { | |
119 | return nlmsg_end(skb, hdr - GENL_HDRLEN - NLMSG_HDRLEN); | |
120 | } | |
121 | ||
122 | /** | |
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 | |
126 | */ | |
127 | static inline int genlmsg_cancel(struct sk_buff *skb, void *hdr) | |
128 | { | |
129 | return nlmsg_cancel(skb, hdr - GENL_HDRLEN - NLMSG_HDRLEN); | |
130 | } | |
131 | ||
132 | /** | |
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 | |
137 | */ | |
138 | static inline int genlmsg_multicast(struct sk_buff *skb, u32 pid, | |
139 | unsigned int group) | |
140 | { | |
141 | return nlmsg_multicast(genl_sock, skb, pid, group); | |
142 | } | |
143 | ||
144 | /** | |
145 | * genlmsg_unicast - unicast a netlink message | |
146 | * @skb: netlink message as socket buffer | |
147 | * @pid: netlink pid of the destination socket | |
148 | */ | |
149 | static inline int genlmsg_unicast(struct sk_buff *skb, u32 pid) | |
150 | { | |
151 | return nlmsg_unicast(genl_sock, skb, pid); | |
152 | } | |
153 | ||
154 | #endif /* __NET_GENERIC_NETLINK_H */ |