sysdeps/gnu/netinet/tcp.h

   1 /*
   2  * Copyright (c) 1982, 1986, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 4. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  *      @(#)tcp.h       8.1 (Berkeley) 6/10/93
  30  */
  31
  32 #ifndef _NETINET_TCP_H
  33 #define _NETINET_TCP_H  1
  34
  35 #include <features.h>
  36
  37 /*
  38  * User-settable options (used with setsockopt).
  39  */
  40 #define TCP_NODELAY              1  /* Don't delay send to coalesce packets  */
  41 #define TCP_MAXSEG               2  /* Set maximum segment size  */
  42 #define TCP_CORK                 3  /* Control sending of partial frames  */
  43 #define TCP_KEEPIDLE             4  /* Start keeplives after this period */
  44 #define TCP_KEEPINTVL            5  /* Interval between keepalives */
  45 #define TCP_KEEPCNT              6  /* Number of keepalives before death */
  46 #define TCP_SYNCNT               7  /* Number of SYN retransmits */
  47 #define TCP_LINGER2              8  /* Life time of orphaned FIN-WAIT-2 state */
  48 #define TCP_DEFER_ACCEPT         9  /* Wake up listener only when data arrive */
  49 #define TCP_WINDOW_CLAMP         10 /* Bound advertised window */
  50 #define TCP_INFO                 11 /* Information about this connection. */
  51 #define TCP_QUICKACK             12 /* Bock/reenable quick ACKs.  */
  52 #define TCP_CONGESTION           13 /* Congestion control algorithm.  */
  53 #define TCP_MD5SIG               14 /* TCP MD5 Signature (RFC2385) */
  54 #define TCP_COOKIE_TRANSACTIONS  15 /* TCP Cookie Transactions */
  55 #define TCP_THIN_LINEAR_TIMEOUTS 16 /* Use linear timeouts for thin streams*/
  56 #define TCP_THIN_DUPACK          17 /* Fast retrans. after 1 dupack */
  57 #define TCP_USER_TIMEOUT         18 /* How long for loss retry before timeout */
  58 #define TCP_REPAIR               19 /* TCP sock is under repair right now */
  59 #define TCP_REPAIR_QUEUE         20 /* Set TCP queue to repair */
  60 #define TCP_QUEUE_SEQ            21 /* Set sequence number of repaired queue. */
  61 #define TCP_REPAIR_OPTIONS       22 /* Repair TCP connection options */
  62 #define TCP_FASTOPEN             23 /* Enable FastOpen on listeners */
  63 #define TCP_TIMESTAMP            24 /* TCP time stamp */
  64 #define TCP_NOTSENT_LOWAT        25 /* Limit number of unsent bytes in
  65                                        write queue.  */
  66 #define TCP_CC_INFO              26 /* Get Congestion Control
  67                                        (optional) info.  */
  68 #define TCP_SAVE_SYN             27 /* Record SYN headers for new
  69                                        connections.  */
  70 #define TCP_SAVED_SYN            28 /* Get SYN headers recorded for
  71                                        connection.  */
  72
  73 #ifdef __USE_MISC
  74 # include <sys/types.h>
  75 # include <sys/socket.h>
  76 # include <stdint.h>
  77
  78 typedef uint32_t tcp_seq;
  79 /*
  80  * TCP header.
  81  * Per RFC 793, September, 1981.
  82  */
  83 struct tcphdr
  84   {
  85     __extension__ union
  86     {
  87       struct
  88       {
  89         uint16_t th_sport;      /* source port */
  90         uint16_t th_dport;      /* destination port */
  91         tcp_seq th_seq;         /* sequence number */
  92         tcp_seq th_ack;         /* acknowledgement number */
  93 # if __BYTE_ORDER == __LITTLE_ENDIAN
  94         uint8_t th_x2:4;        /* (unused) */
  95         uint8_t th_off:4;       /* data offset */
  96 # endif
  97 # if __BYTE_ORDER == __BIG_ENDIAN
  98         uint8_t th_off:4;       /* data offset */
  99         uint8_t th_x2:4;        /* (unused) */
 100 # endif
 101         uint8_t th_flags;
 102 # define TH_FIN 0x01
 103 # define TH_SYN 0x02
 104 # define TH_RST 0x04
 105 # define TH_PUSH        0x08
 106 # define TH_ACK 0x10
 107 # define TH_URG 0x20
 108         uint16_t th_win;        /* window */
 109         uint16_t th_sum;        /* checksum */
 110         uint16_t th_urp;        /* urgent pointer */
 111       };
 112       struct
 113       {
 114         uint16_t source;
 115         uint16_t dest;
 116         uint32_t seq;
 117         uint32_t ack_seq;
 118 # if __BYTE_ORDER == __LITTLE_ENDIAN
 119         uint16_t res1:4;
 120         uint16_t doff:4;
 121         uint16_t fin:1;
 122         uint16_t syn:1;
 123         uint16_t rst:1;
 124         uint16_t psh:1;
 125         uint16_t ack:1;
 126         uint16_t urg:1;
 127         uint16_t res2:2;
 128 # elif __BYTE_ORDER == __BIG_ENDIAN
 129         uint16_t doff:4;
 130         uint16_t res1:4;
 131         uint16_t res2:2;
 132         uint16_t urg:1;
 133         uint16_t ack:1;
 134         uint16_t psh:1;
 135         uint16_t rst:1;
 136         uint16_t syn:1;
 137         uint16_t fin:1;
 138 # else
 139 #  error "Adjust your <bits/endian.h> defines"
 140 # endif
 141         uint16_t window;
 142         uint16_t check;
 143         uint16_t urg_ptr;
 144       };
 145     };
 146 };
 147
 148 enum
 149 {
 150   TCP_ESTABLISHED = 1,
 151   TCP_SYN_SENT,
 152   TCP_SYN_RECV,
 153   TCP_FIN_WAIT1,
 154   TCP_FIN_WAIT2,
 155   TCP_TIME_WAIT,
 156   TCP_CLOSE,
 157   TCP_CLOSE_WAIT,
 158   TCP_LAST_ACK,
 159   TCP_LISTEN,
 160   TCP_CLOSING   /* now a valid state */
 161 };
 162
 163 # define TCPOPT_EOL             0
 164 # define TCPOPT_NOP             1
 165 # define TCPOPT_MAXSEG          2
 166 # define TCPOLEN_MAXSEG         4
 167 # define TCPOPT_WINDOW          3
 168 # define TCPOLEN_WINDOW         3
 169 # define TCPOPT_SACK_PERMITTED  4               /* Experimental */
 170 # define TCPOLEN_SACK_PERMITTED 2
 171 # define TCPOPT_SACK            5               /* Experimental */
 172 # define TCPOPT_TIMESTAMP       8
 173 # define TCPOLEN_TIMESTAMP      10
 174 # define TCPOLEN_TSTAMP_APPA    (TCPOLEN_TIMESTAMP+2) /* appendix A */
 175
 176 # define TCPOPT_TSTAMP_HDR      \
 177     (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)
 178
 179 /*
 180  * Default maximum segment size for TCP.
 181  * With an IP MSS of 576, this is 536,
 182  * but 512 is probably more convenient.
 183  * This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)).
 184  */
 185 # define TCP_MSS        512
 186
 187 # define TCP_MAXWIN     65535   /* largest value for (unscaled) window */
 188
 189 # define TCP_MAX_WINSHIFT       14      /* maximum window shift */
 190
 191 # define SOL_TCP                6       /* TCP level */
 192
 193
 194 # define TCPI_OPT_TIMESTAMPS    1
 195 # define TCPI_OPT_SACK          2
 196 # define TCPI_OPT_WSCALE        4
 197 # define TCPI_OPT_ECN           8  /* ECN was negociated at TCP session init */
 198 # define TCPI_OPT_ECN_SEEN      16 /* we received at least one packet with ECT */
 199 # define TCPI_OPT_SYN_DATA      32 /* SYN-ACK acked data in SYN sent or rcvd */
 200
 201 /* Values for tcpi_state.  */
 202 enum tcp_ca_state
 203 {
 204   TCP_CA_Open = 0,
 205   TCP_CA_Disorder = 1,
 206   TCP_CA_CWR = 2,
 207   TCP_CA_Recovery = 3,
 208   TCP_CA_Loss = 4
 209 };
 210
 211 struct tcp_info
 212 {
 213   uint8_t       tcpi_state;
 214   uint8_t       tcpi_ca_state;
 215   uint8_t       tcpi_retransmits;
 216   uint8_t       tcpi_probes;
 217   uint8_t       tcpi_backoff;
 218   uint8_t       tcpi_options;
 219   uint8_t       tcpi_snd_wscale : 4, tcpi_rcv_wscale : 4;
 220
 221   uint32_t      tcpi_rto;
 222   uint32_t      tcpi_ato;
 223   uint32_t      tcpi_snd_mss;
 224   uint32_t      tcpi_rcv_mss;
 225
 226   uint32_t      tcpi_unacked;
 227   uint32_t      tcpi_sacked;
 228   uint32_t      tcpi_lost;
 229   uint32_t      tcpi_retrans;
 230   uint32_t      tcpi_fackets;
 231
 232   /* Times. */
 233   uint32_t      tcpi_last_data_sent;
 234   uint32_t      tcpi_last_ack_sent;     /* Not remembered, sorry.  */
 235   uint32_t      tcpi_last_data_recv;
 236   uint32_t      tcpi_last_ack_recv;
 237
 238   /* Metrics. */
 239   uint32_t      tcpi_pmtu;
 240   uint32_t      tcpi_rcv_ssthresh;
 241   uint32_t      tcpi_rtt;
 242   uint32_t      tcpi_rttvar;
 243   uint32_t      tcpi_snd_ssthresh;
 244   uint32_t      tcpi_snd_cwnd;
 245   uint32_t      tcpi_advmss;
 246   uint32_t      tcpi_reordering;
 247
 248   uint32_t      tcpi_rcv_rtt;
 249   uint32_t      tcpi_rcv_space;
 250
 251   uint32_t      tcpi_total_retrans;
 252 };
 253
 254
 255 /* For TCP_MD5SIG socket option.  */
 256 #define TCP_MD5SIG_MAXKEYLEN    80
 257
 258 struct tcp_md5sig
 259 {
 260   struct sockaddr_storage tcpm_addr;            /* Address associated.  */
 261   uint16_t      __tcpm_pad1;                    /* Zero.  */
 262   uint16_t      tcpm_keylen;                    /* Key length.  */
 263   uint32_t      __tcpm_pad2;                    /* Zero.  */
 264   uint8_t       tcpm_key[TCP_MD5SIG_MAXKEYLEN]; /* Key (binary).  */
 265 };
 266
 267 /* For socket repair options.  */
 268 struct tcp_repair_opt
 269 {
 270   uint32_t      opt_code;
 271   uint32_t      opt_val;
 272 };
 273
 274 /* Queue to repair, for TCP_REPAIR_QUEUE.  */
 275 enum
 276 {
 277   TCP_NO_QUEUE,
 278   TCP_RECV_QUEUE,
 279   TCP_SEND_QUEUE,
 280   TCP_QUEUES_NR,
 281 };
 282
 283 /* For cookie transactions socket options.  */
 284 #define TCP_COOKIE_MIN          8               /*  64-bits */
 285 #define TCP_COOKIE_MAX          16              /* 128-bits */
 286 #define TCP_COOKIE_PAIR_SIZE    (2*TCP_COOKIE_MAX)
 287
 288 /* Flags for both getsockopt and setsockopt */
 289 #define TCP_COOKIE_IN_ALWAYS    (1 << 0)        /* Discard SYN without cookie */
 290 #define TCP_COOKIE_OUT_NEVER    (1 << 1)        /* Prohibit outgoing cookies,
 291                                                  * supercedes everything. */
 292
 293 /* Flags for getsockopt */
 294 #define TCP_S_DATA_IN           (1 << 2)        /* Was data received? */
 295 #define TCP_S_DATA_OUT          (1 << 3)        /* Was data sent? */
 296
 297 #define TCP_MSS_DEFAULT          536U   /* IPv4 (RFC1122, RFC2581) */
 298 #define TCP_MSS_DESIRED         1220U   /* IPv6 (tunneled), EDNS0 (RFC3226) */
 299
 300 struct tcp_cookie_transactions
 301 {
 302   uint16_t      tcpct_flags;
 303   uint8_t       __tcpct_pad1;
 304   uint8_t       tcpct_cookie_desired;
 305   uint16_t      tcpct_s_data_desired;
 306   uint16_t      tcpct_used;
 307   uint8_t       tcpct_value[TCP_MSS_DEFAULT];
 308 };
 309
 310 #endif /* Misc.  */
 311
 312 #endif /* netinet/tcp.h */