[NETFILTER]: nfnetlink: convert to generic netlink attribute functions
[linux-2.6.git] / include / linux / netfilter / nfnetlink.h
1 #ifndef _NFNETLINK_H
2 #define _NFNETLINK_H
3 #include <linux/types.h>
4 #include <linux/netfilter/nfnetlink_compat.h>
5
6 enum nfnetlink_groups {
7         NFNLGRP_NONE,
8 #define NFNLGRP_NONE                    NFNLGRP_NONE
9         NFNLGRP_CONNTRACK_NEW,
10 #define NFNLGRP_CONNTRACK_NEW           NFNLGRP_CONNTRACK_NEW
11         NFNLGRP_CONNTRACK_UPDATE,
12 #define NFNLGRP_CONNTRACK_UPDATE        NFNLGRP_CONNTRACK_UPDATE
13         NFNLGRP_CONNTRACK_DESTROY,
14 #define NFNLGRP_CONNTRACK_DESTROY       NFNLGRP_CONNTRACK_DESTROY
15         NFNLGRP_CONNTRACK_EXP_NEW,
16 #define NFNLGRP_CONNTRACK_EXP_NEW       NFNLGRP_CONNTRACK_EXP_NEW
17         NFNLGRP_CONNTRACK_EXP_UPDATE,
18 #define NFNLGRP_CONNTRACK_EXP_UPDATE    NFNLGRP_CONNTRACK_EXP_UPDATE
19         NFNLGRP_CONNTRACK_EXP_DESTROY,
20 #define NFNLGRP_CONNTRACK_EXP_DESTROY   NFNLGRP_CONNTRACK_EXP_DESTROY
21         __NFNLGRP_MAX,
22 };
23 #define NFNLGRP_MAX     (__NFNLGRP_MAX - 1)
24
25 /* General form of address family dependent message.
26  */
27 struct nfgenmsg {
28         u_int8_t  nfgen_family;         /* AF_xxx */
29         u_int8_t  version;              /* nfnetlink version */
30         __be16    res_id;               /* resource id */
31 };
32
33 #define NFNETLINK_V0    0
34
35 /* netfilter netlink message types are split in two pieces:
36  * 8 bit subsystem, 8bit operation.
37  */
38
39 #define NFNL_SUBSYS_ID(x)       ((x & 0xff00) >> 8)
40 #define NFNL_MSG_TYPE(x)        (x & 0x00ff)
41
42 /* No enum here, otherwise __stringify() trick of MODULE_ALIAS_NFNL_SUBSYS()
43  * won't work anymore */
44 #define NFNL_SUBSYS_NONE                0
45 #define NFNL_SUBSYS_CTNETLINK           1
46 #define NFNL_SUBSYS_CTNETLINK_EXP       2
47 #define NFNL_SUBSYS_QUEUE               3
48 #define NFNL_SUBSYS_ULOG                4
49 #define NFNL_SUBSYS_COUNT               5
50
51 #ifdef __KERNEL__
52
53 #include <linux/netlink.h>
54 #include <linux/capability.h>
55 #include <net/netlink.h>
56
57 struct nfnl_callback
58 {
59         int (*call)(struct sock *nl, struct sk_buff *skb, 
60                 struct nlmsghdr *nlh, struct nlattr *cda[]);
61         u_int16_t attr_count;   /* number of nlattr's */
62 };
63
64 struct nfnetlink_subsystem
65 {
66         const char *name;
67         __u8 subsys_id;                 /* nfnetlink subsystem ID */
68         __u8 cb_count;                  /* number of callbacks */
69         const struct nfnl_callback *cb; /* callback for individual types */
70 };
71
72 extern int nfnetlink_subsys_register(const struct nfnetlink_subsystem *n);
73 extern int nfnetlink_subsys_unregister(const struct nfnetlink_subsystem *n);
74
75 #define nfattr_bad_size(tb, max, cta_min)                               \
76 ({      int __i, __res = 0;                                             \
77         for (__i=1; __i <= max; __i++) {                                        \
78                 if (!cta_min[__i])                                      \
79                         continue;                                       \
80                 if (tb[__i] && nla_len(tb[__i]) < cta_min[__i]){        \
81                         __res = 1;                                      \
82                         break;                                          \
83                 }                                                       \
84         }                                                               \
85         __res;                                                          \
86 })
87
88 extern int nfnetlink_has_listeners(unsigned int group);
89 extern int nfnetlink_send(struct sk_buff *skb, u32 pid, unsigned group, 
90                           int echo);
91 extern int nfnetlink_unicast(struct sk_buff *skb, u_int32_t pid, int flags);
92
93 #define MODULE_ALIAS_NFNL_SUBSYS(subsys) \
94         MODULE_ALIAS("nfnetlink-subsys-" __stringify(subsys))
95
96 #endif  /* __KERNEL__ */
97 #endif  /* _NFNETLINK_H */