1607ca46eSDavid Howells /* 2607ca46eSDavid Howells * INET An implementation of the TCP/IP protocol suite for the LINUX 3607ca46eSDavid Howells * operating system. INET is implemented using the BSD Socket 4607ca46eSDavid Howells * interface as the means of communication with the user level. 5607ca46eSDavid Howells * 6607ca46eSDavid Howells * Definitions for the TCP protocol. 7607ca46eSDavid Howells * 8607ca46eSDavid Howells * Version: @(#)tcp.h 1.0.2 04/28/93 9607ca46eSDavid Howells * 10607ca46eSDavid Howells * Author: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 11607ca46eSDavid Howells * 12607ca46eSDavid Howells * This program is free software; you can redistribute it and/or 13607ca46eSDavid Howells * modify it under the terms of the GNU General Public License 14607ca46eSDavid Howells * as published by the Free Software Foundation; either version 15607ca46eSDavid Howells * 2 of the License, or (at your option) any later version. 16607ca46eSDavid Howells */ 17607ca46eSDavid Howells #ifndef _UAPI_LINUX_TCP_H 18607ca46eSDavid Howells #define _UAPI_LINUX_TCP_H 19607ca46eSDavid Howells 20607ca46eSDavid Howells #include <linux/types.h> 21607ca46eSDavid Howells #include <asm/byteorder.h> 22607ca46eSDavid Howells #include <linux/socket.h> 23607ca46eSDavid Howells 24607ca46eSDavid Howells struct tcphdr { 25607ca46eSDavid Howells __be16 source; 26607ca46eSDavid Howells __be16 dest; 27607ca46eSDavid Howells __be32 seq; 28607ca46eSDavid Howells __be32 ack_seq; 29607ca46eSDavid Howells #if defined(__LITTLE_ENDIAN_BITFIELD) 30607ca46eSDavid Howells __u16 res1:4, 31607ca46eSDavid Howells doff:4, 32607ca46eSDavid Howells fin:1, 33607ca46eSDavid Howells syn:1, 34607ca46eSDavid Howells rst:1, 35607ca46eSDavid Howells psh:1, 36607ca46eSDavid Howells ack:1, 37607ca46eSDavid Howells urg:1, 38607ca46eSDavid Howells ece:1, 39607ca46eSDavid Howells cwr:1; 40607ca46eSDavid Howells #elif defined(__BIG_ENDIAN_BITFIELD) 41607ca46eSDavid Howells __u16 doff:4, 42607ca46eSDavid Howells res1:4, 43607ca46eSDavid Howells cwr:1, 44607ca46eSDavid Howells ece:1, 45607ca46eSDavid Howells urg:1, 46607ca46eSDavid Howells ack:1, 47607ca46eSDavid Howells psh:1, 48607ca46eSDavid Howells rst:1, 49607ca46eSDavid Howells syn:1, 50607ca46eSDavid Howells fin:1; 51607ca46eSDavid Howells #else 52607ca46eSDavid Howells #error "Adjust your <asm/byteorder.h> defines" 53607ca46eSDavid Howells #endif 54607ca46eSDavid Howells __be16 window; 55607ca46eSDavid Howells __sum16 check; 56607ca46eSDavid Howells __be16 urg_ptr; 57607ca46eSDavid Howells }; 58607ca46eSDavid Howells 59607ca46eSDavid Howells /* 60607ca46eSDavid Howells * The union cast uses a gcc extension to avoid aliasing problems 61607ca46eSDavid Howells * (union is compatible to any of its members) 62607ca46eSDavid Howells * This means this part of the code is -fstrict-aliasing safe now. 63607ca46eSDavid Howells */ 64607ca46eSDavid Howells union tcp_word_hdr { 65607ca46eSDavid Howells struct tcphdr hdr; 66607ca46eSDavid Howells __be32 words[5]; 67607ca46eSDavid Howells }; 68607ca46eSDavid Howells 69607ca46eSDavid Howells #define tcp_flag_word(tp) ( ((union tcp_word_hdr *)(tp))->words [3]) 70607ca46eSDavid Howells 71607ca46eSDavid Howells enum { 72607ca46eSDavid Howells TCP_FLAG_CWR = __constant_cpu_to_be32(0x00800000), 73607ca46eSDavid Howells TCP_FLAG_ECE = __constant_cpu_to_be32(0x00400000), 74607ca46eSDavid Howells TCP_FLAG_URG = __constant_cpu_to_be32(0x00200000), 75607ca46eSDavid Howells TCP_FLAG_ACK = __constant_cpu_to_be32(0x00100000), 76607ca46eSDavid Howells TCP_FLAG_PSH = __constant_cpu_to_be32(0x00080000), 77607ca46eSDavid Howells TCP_FLAG_RST = __constant_cpu_to_be32(0x00040000), 78607ca46eSDavid Howells TCP_FLAG_SYN = __constant_cpu_to_be32(0x00020000), 79607ca46eSDavid Howells TCP_FLAG_FIN = __constant_cpu_to_be32(0x00010000), 80607ca46eSDavid Howells TCP_RESERVED_BITS = __constant_cpu_to_be32(0x0F000000), 81607ca46eSDavid Howells TCP_DATA_OFFSET = __constant_cpu_to_be32(0xF0000000) 82607ca46eSDavid Howells }; 83607ca46eSDavid Howells 84607ca46eSDavid Howells /* 85607ca46eSDavid Howells * TCP general constants 86607ca46eSDavid Howells */ 87607ca46eSDavid Howells #define TCP_MSS_DEFAULT 536U /* IPv4 (RFC1122, RFC2581) */ 88607ca46eSDavid Howells #define TCP_MSS_DESIRED 1220U /* IPv6 (tunneled), EDNS0 (RFC3226) */ 89607ca46eSDavid Howells 90607ca46eSDavid Howells /* TCP socket options */ 91607ca46eSDavid Howells #define TCP_NODELAY 1 /* Turn off Nagle's algorithm. */ 92607ca46eSDavid Howells #define TCP_MAXSEG 2 /* Limit MSS */ 93607ca46eSDavid Howells #define TCP_CORK 3 /* Never send partially complete segments */ 94607ca46eSDavid Howells #define TCP_KEEPIDLE 4 /* Start keeplives after this period */ 95607ca46eSDavid Howells #define TCP_KEEPINTVL 5 /* Interval between keepalives */ 96607ca46eSDavid Howells #define TCP_KEEPCNT 6 /* Number of keepalives before death */ 97607ca46eSDavid Howells #define TCP_SYNCNT 7 /* Number of SYN retransmits */ 98607ca46eSDavid Howells #define TCP_LINGER2 8 /* Life time of orphaned FIN-WAIT-2 state */ 99607ca46eSDavid Howells #define TCP_DEFER_ACCEPT 9 /* Wake up listener only when data arrive */ 100607ca46eSDavid Howells #define TCP_WINDOW_CLAMP 10 /* Bound advertised window */ 101607ca46eSDavid Howells #define TCP_INFO 11 /* Information about this connection. */ 102607ca46eSDavid Howells #define TCP_QUICKACK 12 /* Block/reenable quick acks */ 103607ca46eSDavid Howells #define TCP_CONGESTION 13 /* Congestion control algorithm */ 104607ca46eSDavid Howells #define TCP_MD5SIG 14 /* TCP MD5 Signature (RFC2385) */ 105607ca46eSDavid Howells #define TCP_THIN_LINEAR_TIMEOUTS 16 /* Use linear timeouts for thin streams*/ 106607ca46eSDavid Howells #define TCP_THIN_DUPACK 17 /* Fast retrans. after 1 dupack */ 107607ca46eSDavid Howells #define TCP_USER_TIMEOUT 18 /* How long for loss retry before timeout */ 108607ca46eSDavid Howells #define TCP_REPAIR 19 /* TCP sock is under repair right now */ 109607ca46eSDavid Howells #define TCP_REPAIR_QUEUE 20 110607ca46eSDavid Howells #define TCP_QUEUE_SEQ 21 111607ca46eSDavid Howells #define TCP_REPAIR_OPTIONS 22 112607ca46eSDavid Howells #define TCP_FASTOPEN 23 /* Enable FastOpen on listeners */ 11393be6ce0SAndrey Vagin #define TCP_TIMESTAMP 24 114c9bee3b7SEric Dumazet #define TCP_NOTSENT_LOWAT 25 /* limit number of unsent bytes in write queue */ 1156e9250f5SEric Dumazet #define TCP_CC_INFO 26 /* Get Congestion Control (optional) info */ 116cd8ae852SEric Dumazet #define TCP_SAVE_SYN 27 /* Record SYN headers for new connections */ 117cd8ae852SEric Dumazet #define TCP_SAVED_SYN 28 /* Get SYN headers recorded for connection */ 118b1ed4c4fSAndrey Vagin #define TCP_REPAIR_WINDOW 29 /* Get/set window parameters */ 119607ca46eSDavid Howells 120607ca46eSDavid Howells struct tcp_repair_opt { 121607ca46eSDavid Howells __u32 opt_code; 122607ca46eSDavid Howells __u32 opt_val; 123607ca46eSDavid Howells }; 124607ca46eSDavid Howells 125b1ed4c4fSAndrey Vagin struct tcp_repair_window { 126b1ed4c4fSAndrey Vagin __u32 snd_wl1; 127b1ed4c4fSAndrey Vagin __u32 snd_wnd; 128b1ed4c4fSAndrey Vagin __u32 max_window; 129b1ed4c4fSAndrey Vagin 130b1ed4c4fSAndrey Vagin __u32 rcv_wnd; 131b1ed4c4fSAndrey Vagin __u32 rcv_wup; 132b1ed4c4fSAndrey Vagin }; 133b1ed4c4fSAndrey Vagin 134607ca46eSDavid Howells enum { 135607ca46eSDavid Howells TCP_NO_QUEUE, 136607ca46eSDavid Howells TCP_RECV_QUEUE, 137607ca46eSDavid Howells TCP_SEND_QUEUE, 138607ca46eSDavid Howells TCP_QUEUES_NR, 139607ca46eSDavid Howells }; 140607ca46eSDavid Howells 141607ca46eSDavid Howells /* for TCP_INFO socket option */ 142607ca46eSDavid Howells #define TCPI_OPT_TIMESTAMPS 1 143607ca46eSDavid Howells #define TCPI_OPT_SACK 2 144607ca46eSDavid Howells #define TCPI_OPT_WSCALE 4 145607ca46eSDavid Howells #define TCPI_OPT_ECN 8 /* ECN was negociated at TCP session init */ 146607ca46eSDavid Howells #define TCPI_OPT_ECN_SEEN 16 /* we received at least one packet with ECT */ 1476f73601eSYuchung Cheng #define TCPI_OPT_SYN_DATA 32 /* SYN-ACK acked data in SYN sent or rcvd */ 148607ca46eSDavid Howells 149607ca46eSDavid Howells enum tcp_ca_state { 150607ca46eSDavid Howells TCP_CA_Open = 0, 151607ca46eSDavid Howells #define TCPF_CA_Open (1<<TCP_CA_Open) 152607ca46eSDavid Howells TCP_CA_Disorder = 1, 153607ca46eSDavid Howells #define TCPF_CA_Disorder (1<<TCP_CA_Disorder) 154607ca46eSDavid Howells TCP_CA_CWR = 2, 155607ca46eSDavid Howells #define TCPF_CA_CWR (1<<TCP_CA_CWR) 156607ca46eSDavid Howells TCP_CA_Recovery = 3, 157607ca46eSDavid Howells #define TCPF_CA_Recovery (1<<TCP_CA_Recovery) 158607ca46eSDavid Howells TCP_CA_Loss = 4 159607ca46eSDavid Howells #define TCPF_CA_Loss (1<<TCP_CA_Loss) 160607ca46eSDavid Howells }; 161607ca46eSDavid Howells 162607ca46eSDavid Howells struct tcp_info { 163607ca46eSDavid Howells __u8 tcpi_state; 164607ca46eSDavid Howells __u8 tcpi_ca_state; 165607ca46eSDavid Howells __u8 tcpi_retransmits; 166607ca46eSDavid Howells __u8 tcpi_probes; 167607ca46eSDavid Howells __u8 tcpi_backoff; 168607ca46eSDavid Howells __u8 tcpi_options; 169607ca46eSDavid Howells __u8 tcpi_snd_wscale : 4, tcpi_rcv_wscale : 4; 170eb8329e0SYuchung Cheng __u8 tcpi_delivery_rate_app_limited:1; 171607ca46eSDavid Howells 172607ca46eSDavid Howells __u32 tcpi_rto; 173607ca46eSDavid Howells __u32 tcpi_ato; 174607ca46eSDavid Howells __u32 tcpi_snd_mss; 175607ca46eSDavid Howells __u32 tcpi_rcv_mss; 176607ca46eSDavid Howells 177607ca46eSDavid Howells __u32 tcpi_unacked; 178607ca46eSDavid Howells __u32 tcpi_sacked; 179607ca46eSDavid Howells __u32 tcpi_lost; 180607ca46eSDavid Howells __u32 tcpi_retrans; 181607ca46eSDavid Howells __u32 tcpi_fackets; 182607ca46eSDavid Howells 183607ca46eSDavid Howells /* Times. */ 184607ca46eSDavid Howells __u32 tcpi_last_data_sent; 185607ca46eSDavid Howells __u32 tcpi_last_ack_sent; /* Not remembered, sorry. */ 186607ca46eSDavid Howells __u32 tcpi_last_data_recv; 187607ca46eSDavid Howells __u32 tcpi_last_ack_recv; 188607ca46eSDavid Howells 189607ca46eSDavid Howells /* Metrics. */ 190607ca46eSDavid Howells __u32 tcpi_pmtu; 191607ca46eSDavid Howells __u32 tcpi_rcv_ssthresh; 192607ca46eSDavid Howells __u32 tcpi_rtt; 193607ca46eSDavid Howells __u32 tcpi_rttvar; 194607ca46eSDavid Howells __u32 tcpi_snd_ssthresh; 195607ca46eSDavid Howells __u32 tcpi_snd_cwnd; 196607ca46eSDavid Howells __u32 tcpi_advmss; 197607ca46eSDavid Howells __u32 tcpi_reordering; 198607ca46eSDavid Howells 199607ca46eSDavid Howells __u32 tcpi_rcv_rtt; 200607ca46eSDavid Howells __u32 tcpi_rcv_space; 201607ca46eSDavid Howells 202607ca46eSDavid Howells __u32 tcpi_total_retrans; 203977cb0ecSEric Dumazet 204977cb0ecSEric Dumazet __u64 tcpi_pacing_rate; 205977cb0ecSEric Dumazet __u64 tcpi_max_pacing_rate; 2060df48c26SEric Dumazet __u64 tcpi_bytes_acked; /* RFC4898 tcpEStatsAppHCThruOctetsAcked */ 207bdd1f9edSEric Dumazet __u64 tcpi_bytes_received; /* RFC4898 tcpEStatsAppHCThruOctetsReceived */ 2082efd055cSMarcelo Ricardo Leitner __u32 tcpi_segs_out; /* RFC4898 tcpEStatsPerfSegsOut */ 2092efd055cSMarcelo Ricardo Leitner __u32 tcpi_segs_in; /* RFC4898 tcpEStatsPerfSegsIn */ 210cd9b2660SEric Dumazet 211cd9b2660SEric Dumazet __u32 tcpi_notsent_bytes; 212cd9b2660SEric Dumazet __u32 tcpi_min_rtt; 213a44d6eacSMartin KaFai Lau __u32 tcpi_data_segs_in; /* RFC4898 tcpEStatsDataSegsIn */ 214a44d6eacSMartin KaFai Lau __u32 tcpi_data_segs_out; /* RFC4898 tcpEStatsDataSegsOut */ 215eb8329e0SYuchung Cheng 216eb8329e0SYuchung Cheng __u64 tcpi_delivery_rate; 217efd90174SFrancis Yan 218efd90174SFrancis Yan __u64 tcpi_busy_time; /* Time (usec) busy sending data */ 219efd90174SFrancis Yan __u64 tcpi_rwnd_limited; /* Time (usec) limited by receive window */ 220efd90174SFrancis Yan __u64 tcpi_sndbuf_limited; /* Time (usec) limited by send buffer */ 221607ca46eSDavid Howells }; 222607ca46eSDavid Howells 223*1c885808SFrancis Yan /* netlink attributes types for SCM_TIMESTAMPING_OPT_STATS */ 224*1c885808SFrancis Yan enum { 225*1c885808SFrancis Yan TCP_NLA_PAD, 226*1c885808SFrancis Yan TCP_NLA_BUSY, /* Time (usec) busy sending data */ 227*1c885808SFrancis Yan TCP_NLA_RWND_LIMITED, /* Time (usec) limited by receive window */ 228*1c885808SFrancis Yan TCP_NLA_SNDBUF_LIMITED, /* Time (usec) limited by send buffer */ 229*1c885808SFrancis Yan }; 230*1c885808SFrancis Yan 231607ca46eSDavid Howells /* for TCP_MD5SIG socket option */ 232607ca46eSDavid Howells #define TCP_MD5SIG_MAXKEYLEN 80 233607ca46eSDavid Howells 234607ca46eSDavid Howells struct tcp_md5sig { 235607ca46eSDavid Howells struct __kernel_sockaddr_storage tcpm_addr; /* address associated */ 236607ca46eSDavid Howells __u16 __tcpm_pad1; /* zero */ 237607ca46eSDavid Howells __u16 tcpm_keylen; /* key length */ 238607ca46eSDavid Howells __u32 __tcpm_pad2; /* zero */ 239607ca46eSDavid Howells __u8 tcpm_key[TCP_MD5SIG_MAXKEYLEN]; /* key (binary) */ 240607ca46eSDavid Howells }; 241607ca46eSDavid Howells 242607ca46eSDavid Howells #endif /* _UAPI_LINUX_TCP_H */ 243