| /* |
| * 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 */ |
| |
| #ifdef CONFIG_MPTCP |
| #define MPTCP_ENABLED 42 |
| #endif |
| |
| 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; |
| |
| __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 */ |
| }; |
| |
| /* 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 */ |