2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
6 * Definitions for the TCP protocol.
8 * Version: @(#)tcp.h 1.0.2 04/28/93
10 * Author: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version
15 * 2 of the License, or (at your option) any later version.
27 //#if defined(__LITTLE_ENDIAN_BITFIELD)
38 /*#elif defined(__BIG_ENDIAN_BITFIELD)
50 #error "Adjust your <asm/byteorder.h> defines"
69 TCP_CLOSING
, /* now a valid state */
71 TCP_MAX_STATES
/* Leave at the end! */
74 #define TCP_STATE_MASK 0xF
75 #define TCP_ACTION_FIN (1 << 7)
78 TCPF_ESTABLISHED
= (1 << 1),
79 TCPF_SYN_SENT
= (1 << 2),
80 TCPF_SYN_RECV
= (1 << 3),
81 TCPF_FIN_WAIT1
= (1 << 4),
82 TCPF_FIN_WAIT2
= (1 << 5),
83 TCPF_TIME_WAIT
= (1 << 6),
84 TCPF_CLOSE
= (1 << 7),
85 TCPF_CLOSE_WAIT
= (1 << 8),
86 TCPF_LAST_ACK
= (1 << 9),
87 TCPF_LISTEN
= (1 << 10),
88 TCPF_CLOSING
= (1 << 11)
92 * The union cast uses a gcc extension to avoid aliasing problems
93 * (union is compatible to any of its members)
94 * This means this part of the code is -fstrict-aliasing safe now.
101 #define tcp_flag_word(tp) ( ((union tcp_word_hdr *)(tp))->words [3])
104 TCP_FLAG_CWR
= 0x00800000, // __constant_htonl(0x00800000),
105 TCP_FLAG_ECE
= 0x00400000, //__constant_htonl(0x00400000),
106 TCP_FLAG_URG
= 0x00200000, //__constant_htonl(0x00200000),
107 TCP_FLAG_ACK
= 0x00100000, //__constant_htonl(0x00100000),
108 TCP_FLAG_PSH
= 0x00080000, //__constant_htonl(0x00080000),
109 TCP_FLAG_RST
= 0x00040000, //__constant_htonl(0x00040000),
110 TCP_FLAG_SYN
= 0x00020000, //__constant_htonl(0x00020000),
111 TCP_FLAG_FIN
= 0x00010000, //__constant_htonl(0x00010000),
112 TCP_RESERVED_BITS
= 0x0F000000, //__constant_htonl(0x0F000000),
113 TCP_DATA_OFFSET
= 0xF0000000, //__constant_htonl(0xF0000000)
116 /* TCP socket options */
117 #define TCP_NODELAY 1 /* Turn off Nagle's algorithm. */
118 #define TCP_MAXSEG 2 /* Limit MSS */
119 #define TCP_CORK 3 /* Never send partially complete segments */
120 #define TCP_KEEPIDLE 4 /* Start keeplives after this period */
121 #define TCP_KEEPINTVL 5 /* Interval between keepalives */
122 #define TCP_KEEPCNT 6 /* Number of keepalives before death */
123 #define TCP_SYNCNT 7 /* Number of SYN retransmits */
124 #define TCP_LINGER2 8 /* Life time of orphaned FIN-WAIT-2 state */
125 #define TCP_DEFER_ACCEPT 9 /* Wake up listener only when data arrive */
126 #define TCP_WINDOW_CLAMP 10 /* Bound advertised window */
127 #define TCP_INFO 11 /* Information about this connection. */
128 #define TCP_QUICKACK 12 /* Block/reenable quick acks */
130 #define TCPI_OPT_TIMESTAMPS 1
131 #define TCPI_OPT_SACK 2
132 #define TCPI_OPT_WSCALE 4
133 #define TCPI_OPT_ECN 8
138 #define TCPF_CA_Open (1<<TCP_CA_Open)
140 #define TCPF_CA_Disorder (1<<TCP_CA_Disorder)
142 #define TCPF_CA_CWR (1<<TCP_CA_CWR)
144 #define TCPF_CA_Recovery (1<<TCP_CA_Recovery)
146 #define TCPF_CA_Loss (1<<TCP_CA_Loss)
153 __u8 tcpi_retransmits
;
157 __u8 tcpi_snd_wscale
: 4, tcpi_rcv_wscale
: 4;
171 __u32 tcpi_last_data_sent
;
172 __u32 tcpi_last_ack_sent
; /* Not remembered, sorry. */
173 __u32 tcpi_last_data_recv
;
174 __u32 tcpi_last_ack_recv
;
178 __u32 tcpi_rcv_ssthresh
;
181 __u32 tcpi_snd_ssthresh
;
184 __u32 tcpi_reordering
;
187 #endif /* _LINUX_TCP_H */