/*
|
* 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 _UAPI_LINUX_TCP_H
|
#define _UAPI_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 */
|
#define TCP_CC_INFO 26 /* Get Congestion Control (optional) info */
|
#define TCP_SAVE_SYN 27 /* Record SYN headers for new connections */
|
#define TCP_SAVED_SYN 28 /* Get SYN headers recorded for connection */
|
#define TCP_REPAIR_WINDOW 29 /* Get/set window parameters */
|
#define TCP_FASTOPEN_CONNECT 30 /* Attempt FastOpen with connect */
|
|
struct tcp_repair_opt {
|
__u32 opt_code;
|
__u32 opt_val;
|
};
|
|
struct tcp_repair_window {
|
__u32 snd_wl1;
|
__u32 snd_wnd;
|
__u32 max_window;
|
|
__u32 rcv_wnd;
|
__u32 rcv_wup;
|
};
|
|
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;
|
__u8 tcpi_delivery_rate_app_limited:1;
|
|
__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;
|
|
__u64 tcpi_pacing_rate;
|
__u64 tcpi_max_pacing_rate;
|
__u64 tcpi_bytes_acked; /* RFC4898 tcpEStatsAppHCThruOctetsAcked */
|
__u64 tcpi_bytes_received; /* RFC4898 tcpEStatsAppHCThruOctetsReceived */
|
__u32 tcpi_segs_out; /* RFC4898 tcpEStatsPerfSegsOut */
|
__u32 tcpi_segs_in; /* RFC4898 tcpEStatsPerfSegsIn */
|
|
__u32 tcpi_notsent_bytes;
|
__u32 tcpi_min_rtt;
|
__u32 tcpi_data_segs_in; /* RFC4898 tcpEStatsDataSegsIn */
|
__u32 tcpi_data_segs_out; /* RFC4898 tcpEStatsDataSegsOut */
|
|
__u64 tcpi_delivery_rate;
|
};
|
|
/* 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 /* _UAPI_LINUX_TCP_H */
|
