-enum tcp_conntrack {
- TCP_CONNTRACK_NONE,
- TCP_CONNTRACK_SYN_SENT,
- TCP_CONNTRACK_SYN_RECV,
- TCP_CONNTRACK_ESTABLISHED,
- TCP_CONNTRACK_FIN_WAIT,
- TCP_CONNTRACK_CLOSE_WAIT,
- TCP_CONNTRACK_LAST_ACK,
- TCP_CONNTRACK_TIME_WAIT,
- TCP_CONNTRACK_CLOSE,
- TCP_CONNTRACK_LISTEN,
- TCP_CONNTRACK_MAX,
- TCP_CONNTRACK_IGNORE
-};
-
-/* Window scaling is advertised by the sender */
-#define IP_CT_TCP_STATE_FLAG_WINDOW_SCALE 0x01
-
-/* SACK is permitted by the sender */
-#define IP_CT_TCP_FLAG_SACK_PERM 0x02
-
-struct ip_ct_tcp_state {
- u_int32_t td_end; /* max of seq + len */
- u_int32_t td_maxend; /* max of ack + max(win, 1) */
- u_int32_t td_maxwin; /* max(win) */
- u_int8_t td_scale; /* window scale factor */
- u_int8_t loose; /* used when connection picked up from the middle */
- u_int8_t flags; /* per direction state flags */
-};
-
-struct ip_ct_tcp
-{
- struct ip_ct_tcp_state seen[2]; /* connection parameters per direction */
- u_int8_t state; /* state of the connection (enum tcp_conntrack) */
- /* For detecting stale connections */
- u_int8_t last_dir; /* Direction of the last packet (enum ip_conntrack_dir) */
- u_int8_t retrans; /* Number of retransmitted packets */
- u_int8_t last_index; /* Index of the last packet */
- u_int32_t last_seq; /* Last sequence number seen in dir */
- u_int32_t last_end; /* Last seq + len */
-};