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

   1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
   2#ifndef _UAPI__LINUX_NETFILTER_H
   3#define _UAPI__LINUX_NETFILTER_H
   4
   5#include <linux/types.h>
   6#include <linux/compiler.h>
   7#include <linux/in.h>
   8#include <linux/in6.h>
   9
  10/* Responses from hook functions. */
  11#define NF_DROP 0
  12#define NF_ACCEPT 1
  13#define NF_STOLEN 2
  14#define NF_QUEUE 3
  15#define NF_REPEAT 4
  16#define NF_STOP 5       /* Deprecated, for userspace nf_queue compatibility. */
  17#define NF_MAX_VERDICT NF_STOP
  18
  19/* we overload the higher bits for encoding auxiliary data such as the queue
  20 * number or errno values. Not nice, but better than additional function
  21 * arguments. */
  22#define NF_VERDICT_MASK 0x000000ff
  23
  24/* extra verdict flags have mask 0x0000ff00 */
  25#define NF_VERDICT_FLAG_QUEUE_BYPASS    0x00008000
  26
  27/* queue number (NF_QUEUE) or errno (NF_DROP) */
  28#define NF_VERDICT_QMASK 0xffff0000
  29#define NF_VERDICT_QBITS 16
  30
  31#define NF_QUEUE_NR(x) ((((x) << 16) & NF_VERDICT_QMASK) | NF_QUEUE)
  32
  33#define NF_DROP_ERR(x) (((-x) << 16) | NF_DROP)
  34
  35/* only for userspace compatibility */
  36#ifndef __KERNEL__
  37
  38/* NF_VERDICT_BITS should be 8 now, but userspace might break if this changes */
  39#define NF_VERDICT_BITS 16
  40#endif
  41
  42enum nf_inet_hooks {
  43        NF_INET_PRE_ROUTING,
  44        NF_INET_LOCAL_IN,
  45        NF_INET_FORWARD,
  46        NF_INET_LOCAL_OUT,
  47        NF_INET_POST_ROUTING,
  48        NF_INET_NUMHOOKS,
  49        NF_INET_INGRESS = NF_INET_NUMHOOKS,
  50};
  51
  52enum nf_dev_hooks {
  53        NF_NETDEV_INGRESS,
  54        NF_NETDEV_NUMHOOKS
  55};
  56
  57enum {
  58        NFPROTO_UNSPEC =  0,
  59        NFPROTO_INET   =  1,
  60        NFPROTO_IPV4   =  2,
  61        NFPROTO_ARP    =  3,
  62        NFPROTO_NETDEV =  5,
  63        NFPROTO_BRIDGE =  7,
  64        NFPROTO_IPV6   = 10,
  65        NFPROTO_DECNET = 12,
  66        NFPROTO_NUMPROTO,
  67};
  68
  69union nf_inet_addr {
  70        __u32           all[4];
  71        __be32          ip;
  72        __be32          ip6[4];
  73        struct in_addr  in;
  74        struct in6_addr in6;
  75};
  76
  77#endif /* _UAPI__LINUX_NETFILTER_H */
  78