root/include/linux/netfilter/nfnetlink.h

INCLUDED FROM

#ifndef _NFNETLINK_H
#define _NFNETLINK_H
#include <linux/types.h>
#include <linux/netfilter/nfnetlink_compat.h>

enum nfnetlink_groups {
        NFNLGRP_NONE,
#define NFNLGRP_NONE                    NFNLGRP_NONE
        NFNLGRP_CONNTRACK_NEW,
#define NFNLGRP_CONNTRACK_NEW           NFNLGRP_CONNTRACK_NEW
        NFNLGRP_CONNTRACK_UPDATE,
#define NFNLGRP_CONNTRACK_UPDATE        NFNLGRP_CONNTRACK_UPDATE
        NFNLGRP_CONNTRACK_DESTROY,
#define NFNLGRP_CONNTRACK_DESTROY       NFNLGRP_CONNTRACK_DESTROY
        NFNLGRP_CONNTRACK_EXP_NEW,
#define NFNLGRP_CONNTRACK_EXP_NEW       NFNLGRP_CONNTRACK_EXP_NEW
        NFNLGRP_CONNTRACK_EXP_UPDATE,
#define NFNLGRP_CONNTRACK_EXP_UPDATE    NFNLGRP_CONNTRACK_EXP_UPDATE
        NFNLGRP_CONNTRACK_EXP_DESTROY,
#define NFNLGRP_CONNTRACK_EXP_DESTROY   NFNLGRP_CONNTRACK_EXP_DESTROY
        __NFNLGRP_MAX,
};
#define NFNLGRP_MAX     (__NFNLGRP_MAX - 1)

/* General form of address family dependent message.
 */
struct nfgenmsg {
        u_int8_t  nfgen_family;         /* AF_xxx */
        u_int8_t  version;              /* nfnetlink version */
        __be16    res_id;               /* resource id */
};

#define NFNETLINK_V0    0

/* netfilter netlink message types are split in two pieces:
 * 8 bit subsystem, 8bit operation.
 */

#define NFNL_SUBSYS_ID(x)       ((x & 0xff00) >> 8)
#define NFNL_MSG_TYPE(x)        (x & 0x00ff)

/* No enum here, otherwise __stringify() trick of MODULE_ALIAS_NFNL_SUBSYS()
 * won't work anymore */
#define NFNL_SUBSYS_NONE                0
#define NFNL_SUBSYS_CTNETLINK           1
#define NFNL_SUBSYS_CTNETLINK_EXP       2
#define NFNL_SUBSYS_QUEUE               3
#define NFNL_SUBSYS_ULOG                4
#define NFNL_SUBSYS_COUNT               5

#ifdef __KERNEL__

#include <linux/netlink.h>
#include <linux/capability.h>
#include <net/netlink.h>

struct nfnl_callback
{
        int (*call)(struct sock *nl, struct sk_buff *skb, 
                struct nlmsghdr *nlh, struct nlattr *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(unsigned int group);
extern int nfnetlink_send(struct sk_buff *skb, u32 pid, unsigned group, 
                          int echo);
extern int nfnetlink_unicast(struct sk_buff *skb, u_int32_t pid, int flags);

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

#endif  /* __KERNEL__ */
#endif  /* _NFNETLINK_H */