| #ifndef _NF_CONNTRACK_TCP_H |
| #define _NF_CONNTRACK_TCP_H |
| /* TCP tracking. */ |
| |
| /* This is exposed to userspace (ctnetlink) */ |
| 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_FLAG_WINDOW_SCALE 0x01 |
| |
| /* SACK is permitted by the sender */ |
| #define IP_CT_TCP_FLAG_SACK_PERM 0x02 |
| |
| /* This sender sent FIN first */ |
| #define IP_CT_TCP_FLAG_CLOSE_INIT 0x04 |
| |
| #ifdef __KERNEL__ |
| |
| 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 options */ |
| }; |
| |
| 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_ack; /* Last sequence number seen in opposite dir */ |
| u_int32_t last_end; /* Last seq + len */ |
| u_int16_t last_win; /* Last window advertisement seen in dir */ |
| }; |
| |
| #endif /* __KERNEL__ */ |
| |
| #endif /* _NF_CONNTRACK_TCP_H */ |