1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | #ifndef _NF_CONNTRACK_TCP_H |
3 | #define _NF_CONNTRACK_TCP_H |
4 | |
5 | #include <uapi/linux/netfilter/nf_conntrack_tcp.h> |
6 | |
7 | |
8 | struct ip_ct_tcp_state { |
9 | u_int32_t td_end; /* max of seq + len */ |
10 | u_int32_t td_maxend; /* max of ack + max(win, 1) */ |
11 | u_int32_t td_maxwin; /* max(win) */ |
12 | u_int32_t td_maxack; /* max of ack */ |
13 | u_int8_t td_scale; /* window scale factor */ |
14 | u_int8_t flags; /* per direction options */ |
15 | }; |
16 | |
17 | struct ip_ct_tcp { |
18 | struct ip_ct_tcp_state seen[2]; /* connection parameters per direction */ |
19 | u_int8_t state; /* state of the connection (enum tcp_conntrack) */ |
20 | /* For detecting stale connections */ |
21 | u_int8_t last_dir; /* Direction of the last packet (enum ip_conntrack_dir) */ |
22 | u_int8_t retrans; /* Number of retransmitted packets */ |
23 | u_int8_t last_index; /* Index of the last packet */ |
24 | u_int32_t last_seq; /* Last sequence number seen in dir */ |
25 | u_int32_t last_ack; /* Last sequence number seen in opposite dir */ |
26 | u_int32_t last_end; /* Last seq + len */ |
27 | u_int16_t last_win; /* Last window advertisement seen in dir */ |
28 | /* For SYN packets while we may be out-of-sync */ |
29 | u_int8_t last_wscale; /* Last window scaling factor seen */ |
30 | u_int8_t last_flags; /* Last flags set */ |
31 | }; |
32 | |
33 | #endif /* _NF_CONNTRACK_TCP_H */ |
34 | |