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#ifndef __LINUX_NETFILTER_H

#define __LINUX_NETFILTER_H

#include <linux/types.h>

#include <linux/sysctl.h>

/* Responses from hook functions. */

#define NF_DROP 0

#define NF_ACCEPT 1

#define NF_STOLEN 2

#define NF_QUEUE 3

#define NF_REPEAT 4

#define NF_STOP 5

#define NF_MAX_VERDICT NF_STOP

/* we overload the higher bits for encoding auxiliary data such as the queue

 * number or errno values. Not nice, but better than additional function

 * arguments. */

#define NF_VERDICT_MASK 0x000000ff

/* extra verdict flags have mask 0x0000ff00 */

#define NF_VERDICT_FLAG_QUEUE_BYPASS    0x00008000

/* queue number (NF_QUEUE) or errno (NF_DROP) */

#define NF_VERDICT_QMASK 0xffff0000

#define NF_VERDICT_QBITS 16

#define NF_QUEUE_NR(x) ((((x) << 16) & NF_VERDICT_QMASK) | NF_QUEUE)

#define NF_DROP_ERR(x) (((-x) << 16) | NF_DROP)

/* only for userspace compatibility */

/* Generic cache responses from hook functions.

   <= 0x2000 is used for protocol-flags. */

#define NFC_UNKNOWN 0x4000

#define NFC_ALTERED 0x8000

/* NF_VERDICT_BITS should be 8 now, but userspace might break if this changes */

#define NF_VERDICT_BITS 16

enum nf_inet_hooks {

        NF_INET_PRE_ROUTING,

        NF_INET_LOCAL_IN,

        NF_INET_FORWARD,

        NF_INET_LOCAL_OUT,

        NF_INET_POST_ROUTING,

        NF_INET_NUMHOOKS

};

enum {

        NFPROTO_UNSPEC =  0,

        NFPROTO_INET   =  1,

        NFPROTO_IPV4   =  2,

        NFPROTO_ARP    =  3,

        NFPROTO_BRIDGE =  7,

        NFPROTO_IPV6   = 10,

        NFPROTO_DECNET = 12,

        NFPROTO_NUMPROTO,

};

union nf_inet_addr {

        __u32           all[4];

        __be32          ip;

        __be32          ip6[4];

        struct in_addr  in;

        struct in6_addr in6;

};

#endif /* __LINUX_NETFILTER_H */