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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note *//* * 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 */#define TCP_ULP 31 /* Attach a ULP to a TCP connection */#define TCP_MD5SIG_EXT 32 /* TCP MD5 Signature with extensions */#define TCP_FASTOPEN_KEY 33 /* Set the key for Fast Open (cookie) */#define TCP_FASTOPEN_NO_COOKIE 34 /* Enable TFO without a TFO cookie */#define TCP_ZEROCOPY_RECEIVE 35#define TCP_INQ 36 /* Notify bytes available to read as a cmsg on read */
#define TCP_CM_INQ TCP_INQ
#define TCP_TX_DELAY 37 /* delay outgoing packets by XX usec */
#define TCP_REPAIR_ON 1#define TCP_REPAIR_OFF 0#define TCP_REPAIR_OFF_NO_WP -1 /* Turn off without window probes */
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,};
/* why fastopen failed from client perspective */enum tcp_fastopen_client_fail { TFO_STATUS_UNSPEC, /* catch-all */ TFO_COOKIE_UNAVAILABLE, /* if not in TFO_CLIENT_NO_COOKIE mode */ TFO_DATA_NOT_ACKED, /* SYN-ACK did not ack SYN data */ TFO_SYN_RETRANSMITTED, /* SYN-ACK did not ack SYN data after timeout */};
/* 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 */
/* * Sender's congestion state indicating normal or abnormal situations * in the last round of packets sent. The state is driven by the ACK * information and timer events. */enum tcp_ca_state { /* * Nothing bad has been observed recently. * No apparent reordering, packet loss, or ECN marks. */ TCP_CA_Open = 0,#define TCPF_CA_Open (1<<TCP_CA_Open) /* * The sender enters disordered state when it has received DUPACKs or * SACKs in the last round of packets sent. This could be due to packet * loss or reordering but needs further information to confirm packets * have been lost. */ TCP_CA_Disorder = 1,#define TCPF_CA_Disorder (1<<TCP_CA_Disorder) /* * The sender enters Congestion Window Reduction (CWR) state when it * has received ACKs with ECN-ECE marks, or has experienced congestion * or packet discard on the sender host (e.g. qdisc). */ TCP_CA_CWR = 2,#define TCPF_CA_CWR (1<<TCP_CA_CWR) /* * The sender is in fast recovery and retransmitting lost packets, * typically triggered by ACK events. */ TCP_CA_Recovery = 3,#define TCPF_CA_Recovery (1<<TCP_CA_Recovery) /* * The sender is in loss recovery triggered by retransmission timeout. */ 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, tcpi_fastopen_client_fail:2;
__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;
__u64 tcpi_busy_time; /* Time (usec) busy sending data */ __u64 tcpi_rwnd_limited; /* Time (usec) limited by receive window */ __u64 tcpi_sndbuf_limited; /* Time (usec) limited by send buffer */
__u32 tcpi_delivered; __u32 tcpi_delivered_ce;
__u64 tcpi_bytes_sent; /* RFC4898 tcpEStatsPerfHCDataOctetsOut */ __u64 tcpi_bytes_retrans; /* RFC4898 tcpEStatsPerfOctetsRetrans */ __u32 tcpi_dsack_dups; /* RFC4898 tcpEStatsStackDSACKDups */ __u32 tcpi_reord_seen; /* reordering events seen */
__u32 tcpi_rcv_ooopack; /* Out-of-order packets received */
__u32 tcpi_snd_wnd; /* peer's advertised receive window after * scaling (bytes) */};
/* netlink attributes types for SCM_TIMESTAMPING_OPT_STATS */enum { TCP_NLA_PAD, TCP_NLA_BUSY, /* Time (usec) busy sending data */ TCP_NLA_RWND_LIMITED, /* Time (usec) limited by receive window */ TCP_NLA_SNDBUF_LIMITED, /* Time (usec) limited by send buffer */ TCP_NLA_DATA_SEGS_OUT, /* Data pkts sent including retransmission */ TCP_NLA_TOTAL_RETRANS, /* Data pkts retransmitted */ TCP_NLA_PACING_RATE, /* Pacing rate in bytes per second */ TCP_NLA_DELIVERY_RATE, /* Delivery rate in bytes per second */ TCP_NLA_SND_CWND, /* Sending congestion window */ TCP_NLA_REORDERING, /* Reordering metric */ TCP_NLA_MIN_RTT, /* minimum RTT */ TCP_NLA_RECUR_RETRANS, /* Recurring retransmits for the current pkt */ TCP_NLA_DELIVERY_RATE_APP_LMT, /* delivery rate application limited ? */ TCP_NLA_SNDQ_SIZE, /* Data (bytes) pending in send queue */ TCP_NLA_CA_STATE, /* ca_state of socket */ TCP_NLA_SND_SSTHRESH, /* Slow start size threshold */ TCP_NLA_DELIVERED, /* Data pkts delivered incl. out-of-order */ TCP_NLA_DELIVERED_CE, /* Like above but only ones w/ CE marks */ TCP_NLA_BYTES_SENT, /* Data bytes sent including retransmission */ TCP_NLA_BYTES_RETRANS, /* Data bytes retransmitted */ TCP_NLA_DSACK_DUPS, /* DSACK blocks received */ TCP_NLA_REORD_SEEN, /* reordering events seen */ TCP_NLA_SRTT, /* smoothed RTT in usecs */ TCP_NLA_TIMEOUT_REHASH, /* Timeout-triggered rehash attempts */ TCP_NLA_BYTES_NOTSENT, /* Bytes in write queue not yet sent */ TCP_NLA_EDT, /* Earliest departure time (CLOCK_MONOTONIC) */};
/* for TCP_MD5SIG socket option */#define TCP_MD5SIG_MAXKEYLEN 80
/* tcp_md5sig extension flags for TCP_MD5SIG_EXT */#define TCP_MD5SIG_FLAG_PREFIX 0x1 /* address prefix length */#define TCP_MD5SIG_FLAG_IFINDEX 0x2 /* ifindex set */
struct tcp_md5sig { struct __kernel_sockaddr_storage tcpm_addr; /* address associated */ __u8 tcpm_flags; /* extension flags */ __u8 tcpm_prefixlen; /* address prefix */ __u16 tcpm_keylen; /* key length */ int tcpm_ifindex; /* device index for scope */ __u8 tcpm_key[TCP_MD5SIG_MAXKEYLEN]; /* key (binary) */};
/* INET_DIAG_MD5SIG */struct tcp_diag_md5sig { __u8 tcpm_family; __u8 tcpm_prefixlen; __u16 tcpm_keylen; __be32 tcpm_addr[4]; __u8 tcpm_key[TCP_MD5SIG_MAXKEYLEN];};
/* setsockopt(fd, IPPROTO_TCP, TCP_ZEROCOPY_RECEIVE, ...) */
#define TCP_RECEIVE_ZEROCOPY_FLAG_TLB_CLEAN_HINT 0x1struct tcp_zerocopy_receive { __u64 address; /* in: address of mapping */ __u32 length; /* in/out: number of bytes to map/mapped */ __u32 recv_skip_hint; /* out: amount of bytes to skip */ __u32 inq; /* out: amount of bytes in read queue */ __s32 err; /* out: socket error */ __u64 copybuf_address; /* in: copybuf address (small reads) */ __s32 copybuf_len; /* in/out: copybuf bytes avail/used or error */ __u32 flags; /* in: flags */};#endif /* _UAPI_LINUX_TCP_H */