LXR linux/include/uapi/linux/netfilter.h

   1#ifndef _UAPI__LINUX_NETFILTER_H
   2#define _UAPI__LINUX_NETFILTER_H
   3
   4#include <linux/types.h>
   5#include <linux/compiler.h>
   6#include <linux/sysctl.h>
   7
   8
   9/* Responses from hook functions. */
  10#define NF_DROP 0
  11#define NF_ACCEPT 1
  12#define NF_STOLEN 2
  13#define NF_QUEUE 3
  14#define NF_REPEAT 4
  15#define NF_STOP 5
  16#define NF_MAX_VERDICT NF_STOP
  17
  18/* we overload the higher bits for encoding auxiliary data such as the queue
  19 * number or errno values. Not nice, but better than additional function
  20 * arguments. */
  21#define NF_VERDICT_MASK 0x000000ff
  22
  23/* extra verdict flags have mask 0x0000ff00 */
  24#define NF_VERDICT_FLAG_QUEUE_BYPASS    0x00008000
  25
  26/* queue number (NF_QUEUE) or errno (NF_DROP) */
  27#define NF_VERDICT_QMASK 0xffff0000
  28#define NF_VERDICT_QBITS 16
  29
  30#define NF_QUEUE_NR(x) ((((x) << 16) & NF_VERDICT_QMASK) | NF_QUEUE)
  31
  32#define NF_DROP_ERR(x) (((-x) << 16) | NF_DROP)
  33
  34/* only for userspace compatibility */
  35#ifndef __KERNEL__
  36/* Generic cache responses from hook functions.
  37   <= 0x2000 is used for protocol-flags. */
  38#define NFC_UNKNOWN 0x4000
  39#define NFC_ALTERED 0x8000
  40
  41/* NF_VERDICT_BITS should be 8 now, but userspace might break if this changes */
  42#define NF_VERDICT_BITS 16
  43#endif
  44
  45enum nf_inet_hooks {
  46        NF_INET_PRE_ROUTING,
  47        NF_INET_LOCAL_IN,
  48        NF_INET_FORWARD,
  49        NF_INET_LOCAL_OUT,
  50        NF_INET_POST_ROUTING,
  51        NF_INET_NUMHOOKS
  52};
  53
  54enum {
  55        NFPROTO_UNSPEC =  0,
  56        NFPROTO_IPV4   =  2,
  57        NFPROTO_ARP    =  3,
  58        NFPROTO_BRIDGE =  7,
  59        NFPROTO_IPV6   = 10,
  60        NFPROTO_DECNET = 12,
  61        NFPROTO_NUMPROTO,
  62};
  63
  64union nf_inet_addr {
  65        __u32           all[4];
  66        __be32          ip;
  67        __be32          ip6[4];
  68        struct in_addr  in;
  69        struct in6_addr in6;
  70};
  71
  72#endif /* _UAPI__LINUX_NETFILTER_H */
  73