Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1#ifndef _NFNETLINK_H
2#define _NFNETLINK_H
3
4
5#include <linux/netlink.h>
6#include <linux/capability.h>
7#include <net/netlink.h>
8#include <uapi/linux/netfilter/nfnetlink.h>
9
10struct nfnl_callback {
11 int (*call)(struct net *net, struct sock *nl, struct sk_buff *skb,
12 const struct nlmsghdr *nlh,
13 const struct nlattr * const cda[]);
14 int (*call_rcu)(struct net *net, struct sock *nl, struct sk_buff *skb,
15 const struct nlmsghdr *nlh,
16 const struct nlattr * const cda[]);
17 int (*call_batch)(struct net *net, struct sock *nl, struct sk_buff *skb,
18 const struct nlmsghdr *nlh,
19 const struct nlattr * const cda[]);
20 const struct nla_policy *policy; /* netlink attribute policy */
21 const u_int16_t attr_count; /* number of nlattr's */
22};
23
24struct nfnetlink_subsystem {
25 const char *name;
26 __u8 subsys_id; /* nfnetlink subsystem ID */
27 __u8 cb_count; /* number of callbacks */
28 const struct nfnl_callback *cb; /* callback for individual types */
29 int (*commit)(struct net *net, struct sk_buff *skb);
30 int (*abort)(struct net *net, struct sk_buff *skb);
31 bool (*valid_genid)(struct net *net, u32 genid);
32};
33
34int nfnetlink_subsys_register(const struct nfnetlink_subsystem *n);
35int nfnetlink_subsys_unregister(const struct nfnetlink_subsystem *n);
36
37int nfnetlink_has_listeners(struct net *net, unsigned int group);
38int nfnetlink_send(struct sk_buff *skb, struct net *net, u32 portid,
39 unsigned int group, int echo, gfp_t flags);
40int nfnetlink_set_err(struct net *net, u32 portid, u32 group, int error);
41int nfnetlink_unicast(struct sk_buff *skb, struct net *net, u32 portid,
42 int flags);
43
44static inline u16 nfnl_msg_type(u8 subsys, u8 msg_type)
45{
46 return subsys << 8 | msg_type;
47}
48
49void nfnl_lock(__u8 subsys_id);
50void nfnl_unlock(__u8 subsys_id);
51#ifdef CONFIG_PROVE_LOCKING
52bool lockdep_nfnl_is_held(__u8 subsys_id);
53#else
54static inline bool lockdep_nfnl_is_held(__u8 subsys_id)
55{
56 return true;
57}
58#endif /* CONFIG_PROVE_LOCKING */
59
60/*
61 * nfnl_dereference - fetch RCU pointer when updates are prevented by subsys mutex
62 *
63 * @p: The pointer to read, prior to dereferencing
64 * @ss: The nfnetlink subsystem ID
65 *
66 * Return the value of the specified RCU-protected pointer, but omit
67 * both the smp_read_barrier_depends() and the ACCESS_ONCE(), because
68 * caller holds the NFNL subsystem mutex.
69 */
70#define nfnl_dereference(p, ss) \
71 rcu_dereference_protected(p, lockdep_nfnl_is_held(ss))
72
73#define MODULE_ALIAS_NFNL_SUBSYS(subsys) \
74 MODULE_ALIAS("nfnetlink-subsys-" __stringify(subsys))
75
76#endif /* _NFNETLINK_H */