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.
20 #include <linux/types.h>
21 #include <asm/byteorder.h>
28 #if defined(__LITTLE_ENDIAN_BITFIELD)
39 #elif defined(__BIG_ENDIAN_BITFIELD)
51 #error "Adjust your <asm/byteorder.h> defines"
59 * The union cast uses a gcc extension to avoid aliasing problems
60 * (union is compatible to any of its members)
61 * This means this part of the code is -fstrict-aliasing safe now.
68 #define tcp_flag_word(tp) ( ((union tcp_word_hdr *)(tp))->words [3])
71 TCP_FLAG_CWR = __constant_htonl(0x00800000),
72 TCP_FLAG_ECE = __constant_htonl(0x00400000),
73 TCP_FLAG_URG = __constant_htonl(0x00200000),
74 TCP_FLAG_ACK = __constant_htonl(0x00100000),
75 TCP_FLAG_PSH = __constant_htonl(0x00080000),
76 TCP_FLAG_RST = __constant_htonl(0x00040000),
77 TCP_FLAG_SYN = __constant_htonl(0x00020000),
78 TCP_FLAG_FIN = __constant_htonl(0x00010000),
79 TCP_RESERVED_BITS = __constant_htonl(0x0F000000),
80 TCP_DATA_OFFSET = __constant_htonl(0xF0000000)
83 /* TCP socket options */
84 #define TCP_NODELAY 1 /* Turn off Nagle's algorithm. */
85 #define TCP_MAXSEG 2 /* Limit MSS */
86 #define TCP_CORK 3 /* Never send partially complete segments */
87 #define TCP_KEEPIDLE 4 /* Start keeplives after this period */
88 #define TCP_KEEPINTVL 5 /* Interval between keepalives */
89 #define TCP_KEEPCNT 6 /* Number of keepalives before death */
90 #define TCP_SYNCNT 7 /* Number of SYN retransmits */
91 #define TCP_LINGER2 8 /* Life time of orphaned FIN-WAIT-2 state */
92 #define TCP_DEFER_ACCEPT 9 /* Wake up listener only when data arrive */
93 #define TCP_WINDOW_CLAMP 10 /* Bound advertised window */
94 #define TCP_INFO 11 /* Information about this connection. */
95 #define TCP_QUICKACK 12 /* Block/reenable quick acks */
96 #define TCP_CONGESTION 13 /* Congestion control algorithm */
98 #define TCPI_OPT_TIMESTAMPS 1
99 #define TCPI_OPT_SACK 2
100 #define TCPI_OPT_WSCALE 4
101 #define TCPI_OPT_ECN 8
106 #define TCPF_CA_Open (1<<TCP_CA_Open)
108 #define TCPF_CA_Disorder (1<<TCP_CA_Disorder)
110 #define TCPF_CA_CWR (1<<TCP_CA_CWR)
112 #define TCPF_CA_Recovery (1<<TCP_CA_Recovery)
114 #define TCPF_CA_Loss (1<<TCP_CA_Loss)
121 __u8 tcpi_retransmits;
125 __u8 tcpi_snd_wscale : 4, tcpi_rcv_wscale : 4;
139 __u32 tcpi_last_data_sent;
140 __u32 tcpi_last_ack_sent; /* Not remembered, sorry. */
141 __u32 tcpi_last_data_recv;
142 __u32 tcpi_last_ack_recv;
146 __u32 tcpi_rcv_ssthresh;
149 __u32 tcpi_snd_ssthresh;
152 __u32 tcpi_reordering;
155 __u32 tcpi_rcv_space;
157 __u32 tcpi_total_retrans;
161 #endif /* _LINUX_TCP_H */