1#ifndef _NFNETLINK_H
2#define _NFNETLINK_H
3#include <linux/types.h>
4#include <linux/netfilter/nfnetlink_compat.h>
5
6enum 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 */
27struct nfgenmsg {
28	__u8  nfgen_family;		/* AF_xxx */
29	__u8  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_OSF			5
50#define NFNL_SUBSYS_IPSET		6
51#define NFNL_SUBSYS_ACCT		7
52#define NFNL_SUBSYS_CTNETLINK_TIMEOUT	8
53#define NFNL_SUBSYS_COUNT		9
54
55#ifdef __KERNEL__
56
57#include <linux/netlink.h>
58#include <linux/capability.h>
59#include <net/netlink.h>
60
61struct nfnl_callback {
62	int (*call)(struct sock *nl, struct sk_buff *skb,
63		    const struct nlmsghdr *nlh,
64		    const struct nlattr * const cda[]);
65	int (*call_rcu)(struct sock *nl, struct sk_buff *skb,
66		    const struct nlmsghdr *nlh,
67		    const struct nlattr * const cda[]);
68	const struct nla_policy *policy;	/* netlink attribute policy */
69	const u_int16_t attr_count;		/* number of nlattr's */
70};
71
72struct nfnetlink_subsystem {
73	const char *name;
74	__u8 subsys_id;			/* nfnetlink subsystem ID */
75	__u8 cb_count;			/* number of callbacks */
76	const struct nfnl_callback *cb;	/* callback for individual types */
77};
78
79extern int nfnetlink_subsys_register(const struct nfnetlink_subsystem *n);
80extern int nfnetlink_subsys_unregister(const struct nfnetlink_subsystem *n);
81
82extern int nfnetlink_has_listeners(struct net *net, unsigned int group);
83extern int nfnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned group,
84			  int echo, gfp_t flags);
85extern int nfnetlink_set_err(struct net *net, u32 pid, u32 group, int error);
86extern int nfnetlink_unicast(struct sk_buff *skb, struct net *net, u_int32_t pid, int flags);
87
88extern void nfnl_lock(void);
89extern void nfnl_unlock(void);
90
91#define MODULE_ALIAS_NFNL_SUBSYS(subsys) \
92	MODULE_ALIAS("nfnetlink-subsys-" __stringify(subsys))
93
94#endif	/* __KERNEL__ */
95#endif	/* _NFNETLINK_H */
96