nfnetlink.h

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#ifndef _NFNETLINK_H
#define _NFNETLINK_H


#include <linux/netlink.h>
#include <linux/capability.h>
#include <net/netlink.h>
#include <uapi/linux/netfilter/nfnetlink.h>

struct nfnl_callback {
    int (*call)(struct sock *nl, struct sk_buff *skb, 
            const struct nlmsghdr *nlh,
            const struct nlattr * const cda[]);
    int (*call_rcu)(struct sock *nl, struct sk_buff *skb, 
            const struct nlmsghdr *nlh,
            const struct nlattr * const cda[]);
    const struct nla_policy *policy;    /* netlink attribute policy */
    const u_int16_t attr_count;     /* number of nlattr's */
};

struct nfnetlink_subsystem {
    const char *name;
    __u8 subsys_id;         /* nfnetlink subsystem ID */
    __u8 cb_count;          /* number of callbacks */
    const struct nfnl_callback *cb; /* callback for individual types */
};

extern int nfnetlink_subsys_register(const struct nfnetlink_subsystem *n);
extern int nfnetlink_subsys_unregister(const struct nfnetlink_subsystem *n);

extern int nfnetlink_has_listeners(struct net *net, unsigned int group);
extern int nfnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned int group,
              int echo, gfp_t flags);
extern int nfnetlink_set_err(struct net *net, u32 pid, u32 group, int error);
extern int nfnetlink_unicast(struct sk_buff *skb, struct net *net, u_int32_t pid, int flags);

extern void nfnl_lock(void);
extern void nfnl_unlock(void);

#define MODULE_ALIAS_NFNL_SUBSYS(subsys) \
    MODULE_ALIAS("nfnetlink-subsys-" __stringify(subsys))

#endif  /* _NFNETLINK_H */