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/*

 * INET         An implementation of the TCP/IP protocol suite for the LINUX

 *              operating system.  INET is implemented using the  BSD Socket

 *              interface as the means of communication with the user level.

 *

 *              Definitions for the TCP protocol.

 *

 * Version:     @(#)tcp.h       1.0.2   04/28/93

 *

 * Author:      Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>

 *

 *              This program is free software; you can redistribute it and/or

 *              modify it under the terms of the GNU General Public License

 *              as published by the Free Software Foundation; either version

 *              2 of the License, or (at your option) any later version.

 */

#ifndef _LINUX_TCP_H

#define _LINUX_TCP_H

#include <linux/types.h>

#include <asm/byteorder.h>

#include <linux/socket.h>

struct tcphdr {

        __be16  source;

        __be16  dest;

        __be32  seq;

        __be32  ack_seq;

#if defined(__LITTLE_ENDIAN_BITFIELD)

        __u16   res1:4,

                doff:4,

                fin:1,

                syn:1,

                rst:1,

                psh:1,

                ack:1,

                urg:1,

                ece:1,

                cwr:1;

#elif defined(__BIG_ENDIAN_BITFIELD)

        __u16   doff:4,

                res1:4,

                cwr:1,

                ece:1,

                urg:1,

                ack:1,

                psh:1,

                rst:1,

                syn:1,

                fin:1;

#else

#error  "Adjust your <asm/byteorder.h> defines"

#endif  

        __be16  window;

        __sum16 check;

        __be16  urg_ptr;

};

/*

 *      The union cast uses a gcc extension to avoid aliasing problems

 *  (union is compatible to any of its members)

 *  This means this part of the code is -fstrict-aliasing safe now.

 */

union tcp_word_hdr {

        struct tcphdr hdr;

        __be32            words[5];

};

#define tcp_flag_word(tp) ( ((union tcp_word_hdr *)(tp))->words [3]) 

enum {

        TCP_FLAG_CWR = __constant_cpu_to_be32(0x00800000),

        TCP_FLAG_ECE = __constant_cpu_to_be32(0x00400000),

        TCP_FLAG_URG = __constant_cpu_to_be32(0x00200000),

        TCP_FLAG_ACK = __constant_cpu_to_be32(0x00100000),

        TCP_FLAG_PSH = __constant_cpu_to_be32(0x00080000),

        TCP_FLAG_RST = __constant_cpu_to_be32(0x00040000),

        TCP_FLAG_SYN = __constant_cpu_to_be32(0x00020000),

        TCP_FLAG_FIN = __constant_cpu_to_be32(0x00010000),

        TCP_RESERVED_BITS = __constant_cpu_to_be32(0x0F000000),

        TCP_DATA_OFFSET = __constant_cpu_to_be32(0xF0000000)

};

/*

 * TCP general constants

 */

#define TCP_MSS_DEFAULT          536U   /* IPv4 (RFC1122, RFC2581) */

#define TCP_MSS_DESIRED         1220U   /* IPv6 (tunneled), EDNS0 (RFC3226) */

/* TCP socket options */

#define TCP_NODELAY             1       /* Turn off Nagle's algorithm. */

#define TCP_MAXSEG              2       /* Limit MSS */

#define TCP_CORK                3       /* Never send partially complete segments */

#define TCP_KEEPIDLE            4       /* Start keeplives after this period */

#define TCP_KEEPINTVL           5       /* Interval between keepalives */

#define TCP_KEEPCNT             6       /* Number of keepalives before death */

#define TCP_SYNCNT              7       /* Number of SYN retransmits */

#define TCP_LINGER2             8       /* Life time of orphaned FIN-WAIT-2 state */

#define TCP_DEFER_ACCEPT        9       /* Wake up listener only when data arrive */

#define TCP_WINDOW_CLAMP        10      /* Bound advertised window */

#define TCP_INFO                11      /* Information about this connection. */

#define TCP_QUICKACK            12      /* Block/reenable quick acks */

#define TCP_CONGESTION          13      /* Congestion control algorithm */

#define TCP_MD5SIG              14      /* TCP MD5 Signature (RFC2385) */

#define TCP_THIN_LINEAR_TIMEOUTS 16      /* Use linear timeouts for thin streams*/

#define TCP_THIN_DUPACK         17      /* Fast retrans. after 1 dupack */

#define TCP_USER_TIMEOUT        18      /* How long for loss retry before timeout */

#define TCP_REPAIR              19      /* TCP sock is under repair right now */

#define TCP_REPAIR_QUEUE        20

#define TCP_QUEUE_SEQ           21

#define TCP_REPAIR_OPTIONS      22

#define TCP_FASTOPEN            23      /* Enable FastOpen on listeners */

#define TCP_TIMESTAMP           24

#define TCP_NOTSENT_LOWAT       25      /* limit number of unsent bytes in write queue */

struct tcp_repair_opt {

        __u32   opt_code;

        __u32   opt_val;

};

enum {

        TCP_NO_QUEUE,

        TCP_RECV_QUEUE,

        TCP_SEND_QUEUE,

        TCP_QUEUES_NR,

};

/* for TCP_INFO socket option */

#define TCPI_OPT_TIMESTAMPS     1

#define TCPI_OPT_SACK           2

#define TCPI_OPT_WSCALE         4

#define TCPI_OPT_ECN            8 /* ECN was negociated at TCP session init */

#define TCPI_OPT_ECN_SEEN       16 /* we received at least one packet with ECT */

#define TCPI_OPT_SYN_DATA       32 /* SYN-ACK acked data in SYN sent or rcvd */

enum tcp_ca_state {

        TCP_CA_Open = 0,

#define TCPF_CA_Open    (1<<TCP_CA_Open)

        TCP_CA_Disorder = 1,

#define TCPF_CA_Disorder (1<<TCP_CA_Disorder)

        TCP_CA_CWR = 2,

#define TCPF_CA_CWR     (1<<TCP_CA_CWR)

        TCP_CA_Recovery = 3,

#define TCPF_CA_Recovery (1<<TCP_CA_Recovery)

        TCP_CA_Loss = 4

#define TCPF_CA_Loss    (1<<TCP_CA_Loss)

};

struct tcp_info {

        __u8    tcpi_state;

        __u8    tcpi_ca_state;

        __u8    tcpi_retransmits;

        __u8    tcpi_probes;

        __u8    tcpi_backoff;

        __u8    tcpi_options;

        __u8    tcpi_snd_wscale : 4, tcpi_rcv_wscale : 4;

        __u32   tcpi_rto;

        __u32   tcpi_ato;

        __u32   tcpi_snd_mss;

        __u32   tcpi_rcv_mss;

        __u32   tcpi_unacked;

        __u32   tcpi_sacked;

        __u32   tcpi_lost;

        __u32   tcpi_retrans;

        __u32   tcpi_fackets;

        /* Times. */

        __u32   tcpi_last_data_sent;

        __u32   tcpi_last_ack_sent;     /* Not remembered, sorry. */

        __u32   tcpi_last_data_recv;

        __u32   tcpi_last_ack_recv;

        /* Metrics. */

        __u32   tcpi_pmtu;

        __u32   tcpi_rcv_ssthresh;

        __u32   tcpi_rtt;

        __u32   tcpi_rttvar;

        __u32   tcpi_snd_ssthresh;

        __u32   tcpi_snd_cwnd;

        __u32   tcpi_advmss;

        __u32   tcpi_reordering;

        __u32   tcpi_rcv_rtt;

        __u32   tcpi_rcv_space;

        __u32   tcpi_total_retrans;

};

/* for TCP_MD5SIG socket option */

#define TCP_MD5SIG_MAXKEYLEN    80

struct tcp_md5sig {

        struct __kernel_sockaddr_storage tcpm_addr;     /* address associated */

        __u16   __tcpm_pad1;                            /* zero */

        __u16   tcpm_keylen;                            /* key length */

        __u32   __tcpm_pad2;                            /* zero */

        __u8    tcpm_key[TCP_MD5SIG_MAXKEYLEN];         /* key (binary) */

};

#endif /* _LINUX_TCP_H */