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Linux/include/uapi/linux/tcp.h

  1 /*
  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.
  5  *
  6  *              Definitions for the TCP protocol.
  7  *
  8  * Version:     @(#)tcp.h       1.0.2   04/28/93
  9  *
 10  * Author:      Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 11  *
 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.
 16  */
 17 #ifndef _UAPI_LINUX_TCP_H
 18 #define _UAPI_LINUX_TCP_H
 19 
 20 #include <linux/types.h>
 21 #include <asm/byteorder.h>
 22 #include <linux/socket.h>
 23 
 24 struct tcphdr {
 25         __be16  source;
 26         __be16  dest;
 27         __be32  seq;
 28         __be32  ack_seq;
 29 #if defined(__LITTLE_ENDIAN_BITFIELD)
 30         __u16   res1:4,
 31                 doff:4,
 32                 fin:1,
 33                 syn:1,
 34                 rst:1,
 35                 psh:1,
 36                 ack:1,
 37                 urg:1,
 38                 ece:1,
 39                 cwr:1;
 40 #elif defined(__BIG_ENDIAN_BITFIELD)
 41         __u16   doff:4,
 42                 res1:4,
 43                 cwr:1,
 44                 ece:1,
 45                 urg:1,
 46                 ack:1,
 47                 psh:1,
 48                 rst:1,
 49                 syn:1,
 50                 fin:1;
 51 #else
 52 #error  "Adjust your <asm/byteorder.h> defines"
 53 #endif  
 54         __be16  window;
 55         __sum16 check;
 56         __be16  urg_ptr;
 57 };
 58 
 59 /*
 60  *      The union cast uses a gcc extension to avoid aliasing problems
 61  *  (union is compatible to any of its members)
 62  *  This means this part of the code is -fstrict-aliasing safe now.
 63  */
 64 union tcp_word_hdr { 
 65         struct tcphdr hdr;
 66         __be32            words[5];
 67 }; 
 68 
 69 #define tcp_flag_word(tp) ( ((union tcp_word_hdr *)(tp))->words [3]) 
 70 
 71 enum { 
 72         TCP_FLAG_CWR = __constant_cpu_to_be32(0x00800000),
 73         TCP_FLAG_ECE = __constant_cpu_to_be32(0x00400000),
 74         TCP_FLAG_URG = __constant_cpu_to_be32(0x00200000),
 75         TCP_FLAG_ACK = __constant_cpu_to_be32(0x00100000),
 76         TCP_FLAG_PSH = __constant_cpu_to_be32(0x00080000),
 77         TCP_FLAG_RST = __constant_cpu_to_be32(0x00040000),
 78         TCP_FLAG_SYN = __constant_cpu_to_be32(0x00020000),
 79         TCP_FLAG_FIN = __constant_cpu_to_be32(0x00010000),
 80         TCP_RESERVED_BITS = __constant_cpu_to_be32(0x0F000000),
 81         TCP_DATA_OFFSET = __constant_cpu_to_be32(0xF0000000)
 82 }; 
 83 
 84 /*
 85  * TCP general constants
 86  */
 87 #define TCP_MSS_DEFAULT          536U   /* IPv4 (RFC1122, RFC2581) */
 88 #define TCP_MSS_DESIRED         1220U   /* IPv6 (tunneled), EDNS0 (RFC3226) */
 89 
 90 /* TCP socket options */
 91 #define TCP_NODELAY             1       /* Turn off Nagle's algorithm. */
 92 #define TCP_MAXSEG              2       /* Limit MSS */
 93 #define TCP_CORK                3       /* Never send partially complete segments */
 94 #define TCP_KEEPIDLE            4       /* Start keeplives after this period */
 95 #define TCP_KEEPINTVL           5       /* Interval between keepalives */
 96 #define TCP_KEEPCNT             6       /* Number of keepalives before death */
 97 #define TCP_SYNCNT              7       /* Number of SYN retransmits */
 98 #define TCP_LINGER2             8       /* Life time of orphaned FIN-WAIT-2 state */
 99 #define TCP_DEFER_ACCEPT        9       /* Wake up listener only when data arrive */
100 #define TCP_WINDOW_CLAMP        10      /* Bound advertised window */
101 #define TCP_INFO                11      /* Information about this connection. */
102 #define TCP_QUICKACK            12      /* Block/reenable quick acks */
103 #define TCP_CONGESTION          13      /* Congestion control algorithm */
104 #define TCP_MD5SIG              14      /* TCP MD5 Signature (RFC2385) */
105 #define TCP_THIN_LINEAR_TIMEOUTS 16      /* Use linear timeouts for thin streams*/
106 #define TCP_THIN_DUPACK         17      /* Fast retrans. after 1 dupack */
107 #define TCP_USER_TIMEOUT        18      /* How long for loss retry before timeout */
108 #define TCP_REPAIR              19      /* TCP sock is under repair right now */
109 #define TCP_REPAIR_QUEUE        20
110 #define TCP_QUEUE_SEQ           21
111 #define TCP_REPAIR_OPTIONS      22
112 #define TCP_FASTOPEN            23      /* Enable FastOpen on listeners */
113 #define TCP_TIMESTAMP           24
114 #define TCP_NOTSENT_LOWAT       25      /* limit number of unsent bytes in write queue */
115 
116 struct tcp_repair_opt {
117         __u32   opt_code;
118         __u32   opt_val;
119 };
120 
121 enum {
122         TCP_NO_QUEUE,
123         TCP_RECV_QUEUE,
124         TCP_SEND_QUEUE,
125         TCP_QUEUES_NR,
126 };
127 
128 /* for TCP_INFO socket option */
129 #define TCPI_OPT_TIMESTAMPS     1
130 #define TCPI_OPT_SACK           2
131 #define TCPI_OPT_WSCALE         4
132 #define TCPI_OPT_ECN            8 /* ECN was negociated at TCP session init */
133 #define TCPI_OPT_ECN_SEEN       16 /* we received at least one packet with ECT */
134 #define TCPI_OPT_SYN_DATA       32 /* SYN-ACK acked data in SYN sent or rcvd */
135 
136 enum tcp_ca_state {
137         TCP_CA_Open = 0,
138 #define TCPF_CA_Open    (1<<TCP_CA_Open)
139         TCP_CA_Disorder = 1,
140 #define TCPF_CA_Disorder (1<<TCP_CA_Disorder)
141         TCP_CA_CWR = 2,
142 #define TCPF_CA_CWR     (1<<TCP_CA_CWR)
143         TCP_CA_Recovery = 3,
144 #define TCPF_CA_Recovery (1<<TCP_CA_Recovery)
145         TCP_CA_Loss = 4
146 #define TCPF_CA_Loss    (1<<TCP_CA_Loss)
147 };
148 
149 struct tcp_info {
150         __u8    tcpi_state;
151         __u8    tcpi_ca_state;
152         __u8    tcpi_retransmits;
153         __u8    tcpi_probes;
154         __u8    tcpi_backoff;
155         __u8    tcpi_options;
156         __u8    tcpi_snd_wscale : 4, tcpi_rcv_wscale : 4;
157 
158         __u32   tcpi_rto;
159         __u32   tcpi_ato;
160         __u32   tcpi_snd_mss;
161         __u32   tcpi_rcv_mss;
162 
163         __u32   tcpi_unacked;
164         __u32   tcpi_sacked;
165         __u32   tcpi_lost;
166         __u32   tcpi_retrans;
167         __u32   tcpi_fackets;
168 
169         /* Times. */
170         __u32   tcpi_last_data_sent;
171         __u32   tcpi_last_ack_sent;     /* Not remembered, sorry. */
172         __u32   tcpi_last_data_recv;
173         __u32   tcpi_last_ack_recv;
174 
175         /* Metrics. */
176         __u32   tcpi_pmtu;
177         __u32   tcpi_rcv_ssthresh;
178         __u32   tcpi_rtt;
179         __u32   tcpi_rttvar;
180         __u32   tcpi_snd_ssthresh;
181         __u32   tcpi_snd_cwnd;
182         __u32   tcpi_advmss;
183         __u32   tcpi_reordering;
184 
185         __u32   tcpi_rcv_rtt;
186         __u32   tcpi_rcv_space;
187 
188         __u32   tcpi_total_retrans;
189 };
190 
191 /* for TCP_MD5SIG socket option */
192 #define TCP_MD5SIG_MAXKEYLEN    80
193 
194 struct tcp_md5sig {
195         struct __kernel_sockaddr_storage tcpm_addr;     /* address associated */
196         __u16   __tcpm_pad1;                            /* zero */
197         __u16   tcpm_keylen;                            /* key length */
198         __u32   __tcpm_pad2;                            /* zero */
199         __u8    tcpm_key[TCP_MD5SIG_MAXKEYLEN];         /* key (binary) */
200 };
201 
202 #endif /* _UAPI_LINUX_TCP_H */
203 

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