root/include/uapi/linux/netfilter.h

INCLUDED FROM

   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 
  42 enum 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 };
  50 
  51 enum nf_dev_hooks {
  52         NF_NETDEV_INGRESS,
  53         NF_NETDEV_NUMHOOKS
  54 };
  55 
  56 enum {
  57         NFPROTO_UNSPEC =  0,
  58         NFPROTO_INET   =  1,
  59         NFPROTO_IPV4   =  2,
  60         NFPROTO_ARP    =  3,
  61         NFPROTO_NETDEV =  5,
  62         NFPROTO_BRIDGE =  7,
  63         NFPROTO_IPV6   = 10,
  64         NFPROTO_DECNET = 12,
  65         NFPROTO_NUMPROTO,
  66 };
  67 
  68 union nf_inet_addr {
  69         __u32           all[4];
  70         __be32          ip;
  71         __be32          ip6[4];
  72         struct in_addr  in;
  73         struct in6_addr in6;
  74 };
  75 
  76 #endif /* _UAPI__LINUX_NETFILTER_H */