release/src-rt-6.x.4708/toolchains/hndtools-arm-linux-2.6.36-uclibc-4.5.3/arm-brcm-linux-uclibcgnueabi/sysroot/usr/include/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 _LINUX_TCP_H
  18 #define _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 = __cpu_to_be32(0x00800000),
  73         TCP_FLAG_ECE = __cpu_to_be32(0x00400000),
  74         TCP_FLAG_URG = __cpu_to_be32(0x00200000),
  75         TCP_FLAG_ACK = __cpu_to_be32(0x00100000),
  76         TCP_FLAG_PSH = __cpu_to_be32(0x00080000),
  77         TCP_FLAG_RST = __cpu_to_be32(0x00040000),
  78         TCP_FLAG_SYN = __cpu_to_be32(0x00020000),
  79         TCP_FLAG_FIN = __cpu_to_be32(0x00010000),
  80         TCP_RESERVED_BITS = __cpu_to_be32(0x0F000000),
  81         TCP_DATA_OFFSET = __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_COOKIE_TRANSACTIONS 15      /* TCP Cookie Transactions */
 106 #define TCP_THIN_LINEAR_TIMEOUTS 16      /* Use linear timeouts for thin streams*/
 107 #define TCP_THIN_DUPACK         17      /* Fast retrans. after 1 dupack */
 108
 109 /* for TCP_INFO socket option */
 110 #define TCPI_OPT_TIMESTAMPS     1
 111 #define TCPI_OPT_SACK           2
 112 #define TCPI_OPT_WSCALE         4
 113 #define TCPI_OPT_ECN            8
 114
 115 enum tcp_ca_state {
 116         TCP_CA_Open = 0,
 117 #define TCPF_CA_Open    (1<<TCP_CA_Open)
 118         TCP_CA_Disorder = 1,
 119 #define TCPF_CA_Disorder (1<<TCP_CA_Disorder)
 120         TCP_CA_CWR = 2,
 121 #define TCPF_CA_CWR     (1<<TCP_CA_CWR)
 122         TCP_CA_Recovery = 3,
 123 #define TCPF_CA_Recovery (1<<TCP_CA_Recovery)
 124         TCP_CA_Loss = 4
 125 #define TCPF_CA_Loss    (1<<TCP_CA_Loss)
 126 };
 127
 128 struct tcp_info {
 129         __u8    tcpi_state;
 130         __u8    tcpi_ca_state;
 131         __u8    tcpi_retransmits;
 132         __u8    tcpi_probes;
 133         __u8    tcpi_backoff;
 134         __u8    tcpi_options;
 135         __u8    tcpi_snd_wscale : 4, tcpi_rcv_wscale : 4;
 136
 137         __u32   tcpi_rto;
 138         __u32   tcpi_ato;
 139         __u32   tcpi_snd_mss;
 140         __u32   tcpi_rcv_mss;
 141
 142         __u32   tcpi_unacked;
 143         __u32   tcpi_sacked;
 144         __u32   tcpi_lost;
 145         __u32   tcpi_retrans;
 146         __u32   tcpi_fackets;
 147
 148         /* Times. */
 149         __u32   tcpi_last_data_sent;
 150         __u32   tcpi_last_ack_sent;     /* Not remembered, sorry. */
 151         __u32   tcpi_last_data_recv;
 152         __u32   tcpi_last_ack_recv;
 153
 154         /* Metrics. */
 155         __u32   tcpi_pmtu;
 156         __u32   tcpi_rcv_ssthresh;
 157         __u32   tcpi_rtt;
 158         __u32   tcpi_rttvar;
 159         __u32   tcpi_snd_ssthresh;
 160         __u32   tcpi_snd_cwnd;
 161         __u32   tcpi_advmss;
 162         __u32   tcpi_reordering;
 163
 164         __u32   tcpi_rcv_rtt;
 165         __u32   tcpi_rcv_space;
 166
 167         __u32   tcpi_total_retrans;
 168 };
 169
 170 /* for TCP_MD5SIG socket option */
 171 #define TCP_MD5SIG_MAXKEYLEN    80
 172
 173 struct tcp_md5sig {
 174         struct __kernel_sockaddr_storage tcpm_addr;     /* address associated */
 175         __u16   __tcpm_pad1;                            /* zero */
 176         __u16   tcpm_keylen;                            /* key length */
 177         __u32   __tcpm_pad2;                            /* zero */
 178         __u8    tcpm_key[TCP_MD5SIG_MAXKEYLEN];         /* key (binary) */
 179 };
 180
 181 /* for TCP_COOKIE_TRANSACTIONS (TCPCT) socket option */
 182 #define TCP_COOKIE_MIN           8              /*  64-bits */
 183 #define TCP_COOKIE_MAX          16              /* 128-bits */
 184 #define TCP_COOKIE_PAIR_SIZE    (2*TCP_COOKIE_MAX)
 185
 186 /* Flags for both getsockopt and setsockopt */
 187 #define TCP_COOKIE_IN_ALWAYS    (1 << 0)        /* Discard SYN without cookie */
 188 #define TCP_COOKIE_OUT_NEVER    (1 << 1)        /* Prohibit outgoing cookies,
 189                                                  * supercedes everything. */
 190
 191 /* Flags for getsockopt */
 192 #define TCP_S_DATA_IN           (1 << 2)        /* Was data received? */
 193 #define TCP_S_DATA_OUT          (1 << 3)        /* Was data sent? */
 194
 195 /* TCP_COOKIE_TRANSACTIONS data */
 196 struct tcp_cookie_transactions {
 197         __u16   tcpct_flags;                    /* see above */
 198         __u8    __tcpct_pad1;                   /* zero */
 199         __u8    tcpct_cookie_desired;           /* bytes */
 200         __u16   tcpct_s_data_desired;           /* bytes of variable data */
 201         __u16   tcpct_used;                     /* bytes in value */
 202         __u8    tcpct_value[TCP_MSS_DEFAULT];
 203 };
 204
 205
 206 #endif  /* _LINUX_TCP_H */