Lines Matching defs:*
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.
17 #ifndef _LINUX_TCP_H
18 #define _LINUX_TCP_H
20 #include <linux/types.h>
21 #include <asm/byteorder.h>
23 struct tcphdr {
24 __u16 source;
25 __u16 dest;
26 __u32 seq;
27 __u32 ack_seq;
28 #if defined(__LITTLE_ENDIAN_BITFIELD)
29 __u16 res1:4,
30 doff:4,
31 fin:1,
32 syn:1,
33 rst:1,
34 psh:1,
35 ack:1,
36 urg:1,
37 ece:1,
38 cwr:1;
39 #elif defined(__BIG_ENDIAN_BITFIELD)
40 __u16 doff:4,
41 res1:4,
42 cwr:1,
43 ece:1,
44 urg:1,
45 ack:1,
46 psh:1,
47 rst:1,
48 syn:1,
49 fin:1;
50 #else
51 #error "Adjust your <asm/byteorder.h> defines"
52 #endif
53 __u16 window;
54 __u16 check;
55 __u16 urg_ptr;
58 #define TCP_ACTION_FIN (1 << 7)
60 enum {
61 TCPF_ESTABLISHED = (1 << 1),
62 TCPF_SYN_SENT = (1 << 2),
63 TCPF_SYN_RECV = (1 << 3),
64 TCPF_FIN_WAIT1 = (1 << 4),
65 TCPF_FIN_WAIT2 = (1 << 5),
66 TCPF_TIME_WAIT = (1 << 6),
67 TCPF_CLOSE = (1 << 7),
68 TCPF_CLOSE_WAIT = (1 << 8),
69 TCPF_LAST_ACK = (1 << 9),
70 TCPF_LISTEN = (1 << 10),
71 TCPF_CLOSING = (1 << 11)
75 * The union cast uses a gcc extension to avoid aliasing problems
76 * (union is compatible to any of its members)
77 * This means this part of the code is -fstrict-aliasing safe now.
79 union tcp_word_hdr {
80 struct tcphdr hdr;
81 __u32 words[5];
84 #define tcp_flag_word(tp) ( ((union tcp_word_hdr *)(tp))->words [3])
86 enum {
87 TCP_FLAG_CWR = __constant_htonl(0x00800000),
88 TCP_FLAG_ECE = __constant_htonl(0x00400000),
89 TCP_FLAG_URG = __constant_htonl(0x00200000),
90 TCP_FLAG_ACK = __constant_htonl(0x00100000),
91 TCP_FLAG_PSH = __constant_htonl(0x00080000),
92 TCP_FLAG_RST = __constant_htonl(0x00040000),
93 TCP_FLAG_SYN = __constant_htonl(0x00020000),
94 TCP_FLAG_FIN = __constant_htonl(0x00010000),
95 TCP_RESERVED_BITS = __constant_htonl(0x0F000000),
96 TCP_DATA_OFFSET = __constant_htonl(0xF0000000)
99 /* TCP socket options */
100 #define TCP_NODELAY 1 /* Turn off Nagle's algorithm. */
101 #define TCP_MAXSEG 2 /* Limit MSS */
102 #define TCP_CORK 3 /* Never send partially complete segments */
103 #define TCP_KEEPIDLE 4 /* Start keeplives after this period */
104 #define TCP_KEEPINTVL 5 /* Interval between keepalives */
105 #define TCP_KEEPCNT 6 /* Number of keepalives before death */
106 #define TCP_SYNCNT 7 /* Number of SYN retransmits */
107 #define TCP_LINGER2 8 /* Life time of orphaned FIN-WAIT-2 state */
108 #define TCP_DEFER_ACCEPT 9 /* Wake up listener only when data arrive */
109 #define TCP_WINDOW_CLAMP 10 /* Bound advertised window */
110 #define TCP_INFO 11 /* Information about this connection. */
111 #define TCP_QUICKACK 12 /* Block/reenable quick acks */
112 #define TCP_CONGESTION 13 /* Congestion control algorithm */
114 #define TCPI_OPT_TIMESTAMPS 1
115 #define TCPI_OPT_SACK 2
116 #define TCPI_OPT_WSCALE 4
117 #define TCPI_OPT_ECN 8
119 enum tcp_ca_state
121 TCP_CA_Open = 0,
122 #define TCPF_CA_Open (1<<TCP_CA_Open)
123 TCP_CA_Disorder = 1,
124 #define TCPF_CA_Disorder (1<<TCP_CA_Disorder)
125 TCP_CA_CWR = 2,
126 #define TCPF_CA_CWR (1<<TCP_CA_CWR)
127 TCP_CA_Recovery = 3,
128 #define TCPF_CA_Recovery (1<<TCP_CA_Recovery)
129 TCP_CA_Loss = 4
130 #define TCPF_CA_Loss (1<<TCP_CA_Loss)
133 struct tcp_info
135 __u8 tcpi_state;
136 __u8 tcpi_ca_state;
137 __u8 tcpi_retransmits;
138 __u8 tcpi_probes;
139 __u8 tcpi_backoff;
140 __u8 tcpi_options;
141 __u8 tcpi_snd_wscale : 4, tcpi_rcv_wscale : 4;
143 __u32 tcpi_rto;
144 __u32 tcpi_ato;
145 __u32 tcpi_snd_mss;
146 __u32 tcpi_rcv_mss;
148 __u32 tcpi_unacked;
149 __u32 tcpi_sacked;
150 __u32 tcpi_lost;
151 __u32 tcpi_retrans;
152 __u32 tcpi_fackets;
154 /* Times. */
155 __u32 tcpi_last_data_sent;
156 __u32 tcpi_last_ack_sent; /* Not remembered, sorry. */
157 __u32 tcpi_last_data_recv;
158 __u32 tcpi_last_ack_recv;
160 /* Metrics. */
161 __u32 tcpi_pmtu;
162 __u32 tcpi_rcv_ssthresh;
163 __u32 tcpi_rtt;
164 __u32 tcpi_rttvar;
165 __u32 tcpi_snd_ssthresh;
166 __u32 tcpi_snd_cwnd;
167 __u32 tcpi_advmss;
168 __u32 tcpi_reordering;
170 __u32 tcpi_rcv_rtt;
171 __u32 tcpi_rcv_space;
173 __u32 tcpi_total_retrans;
177 #endif /* _LINUX_TCP_H */