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 /* Generic cache responses from hook functions.
  38    <= 0x2000 is used for protocol-flags. */
  39 #define NFC_UNKNOWN 0x4000
  40 #define NFC_ALTERED 0x8000
  41
  42 /* NF_VERDICT_BITS should be 8 now, but userspace might break if this changes */
  43 #define NF_VERDICT_BITS 16
  44 #endif
  45
  46 enum nf_inet_hooks {
  47         NF_INET_PRE_ROUTING,
  48         NF_INET_LOCAL_IN,
  49         NF_INET_FORWARD,
  50         NF_INET_LOCAL_OUT,
  51         NF_INET_POST_ROUTING,
  52         NF_INET_NUMHOOKS
  53 };
  54
  55 enum nf_dev_hooks {
  56         NF_NETDEV_INGRESS,
  57         NF_NETDEV_NUMHOOKS
  58 };
  59
  60 enum {
  61         NFPROTO_UNSPEC =  0,
  62         NFPROTO_INET   =  1,
  63         NFPROTO_IPV4   =  2,
  64         NFPROTO_ARP    =  3,
  65         NFPROTO_NETDEV =  5,
  66         NFPROTO_BRIDGE =  7,
  67         NFPROTO_IPV6   = 10,
  68         NFPROTO_DECNET = 12,
  69         NFPROTO_NUMPROTO,
  70 };
  71
  72 union nf_inet_addr {
  73         __u32           all[4];
  74         __be32          ip;
  75         __be32          ip6[4];
  76         struct in_addr  in;
  77         struct in6_addr in6;
  78 };
  79
  80 #endif /* _UAPI__LINUX_NETFILTER_H */