root/include/uapi/linux/netfilter/nf_conntrack_tcp.h

INCLUDED FROM

   1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
   2 #ifndef _UAPI_NF_CONNTRACK_TCP_H
   3 #define _UAPI_NF_CONNTRACK_TCP_H
   4 /* TCP tracking. */
   5 
   6 #include <linux/types.h>
   7 
   8 /* This is exposed to userspace (ctnetlink) */
   9 enum tcp_conntrack {
  10         TCP_CONNTRACK_NONE,
  11         TCP_CONNTRACK_SYN_SENT,
  12         TCP_CONNTRACK_SYN_RECV,
  13         TCP_CONNTRACK_ESTABLISHED,
  14         TCP_CONNTRACK_FIN_WAIT,
  15         TCP_CONNTRACK_CLOSE_WAIT,
  16         TCP_CONNTRACK_LAST_ACK,
  17         TCP_CONNTRACK_TIME_WAIT,
  18         TCP_CONNTRACK_CLOSE,
  19         TCP_CONNTRACK_LISTEN,   /* obsolete */
  20 #define TCP_CONNTRACK_SYN_SENT2 TCP_CONNTRACK_LISTEN
  21         TCP_CONNTRACK_MAX,
  22         TCP_CONNTRACK_IGNORE,
  23         TCP_CONNTRACK_RETRANS,
  24         TCP_CONNTRACK_UNACK,
  25         TCP_CONNTRACK_TIMEOUT_MAX
  26 };
  27 
  28 /* Window scaling is advertised by the sender */
  29 #define IP_CT_TCP_FLAG_WINDOW_SCALE             0x01
  30 
  31 /* SACK is permitted by the sender */
  32 #define IP_CT_TCP_FLAG_SACK_PERM                0x02
  33 
  34 /* This sender sent FIN first */
  35 #define IP_CT_TCP_FLAG_CLOSE_INIT               0x04
  36 
  37 /* Be liberal in window checking */
  38 #define IP_CT_TCP_FLAG_BE_LIBERAL               0x08
  39 
  40 /* Has unacknowledged data */
  41 #define IP_CT_TCP_FLAG_DATA_UNACKNOWLEDGED      0x10
  42 
  43 /* The field td_maxack has been set */
  44 #define IP_CT_TCP_FLAG_MAXACK_SET               0x20
  45 
  46 /* Marks possibility for expected RFC5961 challenge ACK */
  47 #define IP_CT_EXP_CHALLENGE_ACK                 0x40
  48 
  49 /* Simultaneous open initialized */
  50 #define IP_CT_TCP_SIMULTANEOUS_OPEN             0x80
  51 
  52 struct nf_ct_tcp_flags {
  53         __u8 flags;
  54         __u8 mask;
  55 };
  56 
  57 
  58 #endif /* _UAPI_NF_CONNTRACK_TCP_H */