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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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2 | #ifndef _NF_CONNTRACK_TCP_H |
3 | #define _NF_CONNTRACK_TCP_H | |
9fb9cbb1 | 4 | |
94d0ec58 | 5 | #include <uapi/linux/netfilter/nf_conntrack_tcp.h> |
60c195c7 | 6 | |
9fb9cbb1 YK |
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) */ | |
bfcaa502 | 12 | u_int32_t td_maxack; /* max of ack */ |
9fb9cbb1 | 13 | u_int8_t td_scale; /* window scale factor */ |
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14 | u_int8_t flags; /* per direction options */ |
15 | }; | |
16 | ||
d94d9fee | 17 | struct ip_ct_tcp { |
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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 */ | |
c1fe3ca5 | 27 | u_int16_t last_win; /* Last window advertisement seen in dir */ |
c4832c7b PNA |
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 */ | |
9fb9cbb1 YK |
31 | }; |
32 | ||
9fb9cbb1 | 33 | #endif /* _NF_CONNTRACK_TCP_H */ |