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e2be04c7f9
Many user space API headers have licensing information, which is either
incomplete, badly formatted or just a shorthand for referring to the
license under which the file is supposed to be. This makes it hard for
compliance tools to determine the correct license.
Update these files with an SPDX license identifier. The identifier was
chosen based on the license information in the file.
GPL/LGPL licensed headers get the matching GPL/LGPL SPDX license
identifier with the added 'WITH Linux-syscall-note' exception, which is
the officially assigned exception identifier for the kernel syscall
exception:
NOTE! This copyright does *not* cover user programs that use kernel
services by normal system calls - this is merely considered normal use
of the kernel, and does *not* fall under the heading of "derived work".
This exception makes it possible to include GPL headers into non GPL
code, without confusing license compliance tools.
Headers which have either explicit dual licensing or are just licensed
under a non GPL license are updated with the corresponding SPDX
identifier and the GPLv2 with syscall exception identifier. The format
is:
((GPL-2.0 WITH Linux-syscall-note) OR SPDX-ID-OF-OTHER-LICENSE)
SPDX license identifiers are a legally binding shorthand, which can be
used instead of the full boiler plate text. The update does not remove
existing license information as this has to be done on a case by case
basis and the copyright holders might have to be consulted. This will
happen in a separate step.
This patch is based on work done by Thomas Gleixner and Kate Stewart and
Philippe Ombredanne. See the previous patch in this series for the
methodology of how this patch was researched.
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
269 lines
8 KiB
C
269 lines
8 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
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/*
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* INET An implementation of the TCP/IP protocol suite for the LINUX
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* operating system. INET is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* Definitions for the TCP protocol.
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*
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* Version: @(#)tcp.h 1.0.2 04/28/93
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*
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* Author: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _UAPI_LINUX_TCP_H
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#define _UAPI_LINUX_TCP_H
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#include <linux/types.h>
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#include <asm/byteorder.h>
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#include <linux/socket.h>
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struct tcphdr {
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__be16 source;
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__be16 dest;
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__be32 seq;
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__be32 ack_seq;
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#if defined(__LITTLE_ENDIAN_BITFIELD)
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__u16 res1:4,
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doff:4,
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fin:1,
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syn:1,
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rst:1,
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psh:1,
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ack:1,
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urg:1,
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ece:1,
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cwr:1;
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#elif defined(__BIG_ENDIAN_BITFIELD)
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__u16 doff:4,
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res1:4,
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cwr:1,
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ece:1,
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urg:1,
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ack:1,
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psh:1,
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rst:1,
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syn:1,
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fin:1;
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#else
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#error "Adjust your <asm/byteorder.h> defines"
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#endif
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__be16 window;
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__sum16 check;
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__be16 urg_ptr;
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};
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/*
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* The union cast uses a gcc extension to avoid aliasing problems
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* (union is compatible to any of its members)
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* This means this part of the code is -fstrict-aliasing safe now.
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*/
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union tcp_word_hdr {
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struct tcphdr hdr;
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__be32 words[5];
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};
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#define tcp_flag_word(tp) ( ((union tcp_word_hdr *)(tp))->words [3])
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enum {
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TCP_FLAG_CWR = __constant_cpu_to_be32(0x00800000),
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TCP_FLAG_ECE = __constant_cpu_to_be32(0x00400000),
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TCP_FLAG_URG = __constant_cpu_to_be32(0x00200000),
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TCP_FLAG_ACK = __constant_cpu_to_be32(0x00100000),
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TCP_FLAG_PSH = __constant_cpu_to_be32(0x00080000),
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TCP_FLAG_RST = __constant_cpu_to_be32(0x00040000),
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TCP_FLAG_SYN = __constant_cpu_to_be32(0x00020000),
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TCP_FLAG_FIN = __constant_cpu_to_be32(0x00010000),
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TCP_RESERVED_BITS = __constant_cpu_to_be32(0x0F000000),
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TCP_DATA_OFFSET = __constant_cpu_to_be32(0xF0000000)
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};
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/*
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* TCP general constants
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*/
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#define TCP_MSS_DEFAULT 536U /* IPv4 (RFC1122, RFC2581) */
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#define TCP_MSS_DESIRED 1220U /* IPv6 (tunneled), EDNS0 (RFC3226) */
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/* TCP socket options */
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#define TCP_NODELAY 1 /* Turn off Nagle's algorithm. */
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#define TCP_MAXSEG 2 /* Limit MSS */
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#define TCP_CORK 3 /* Never send partially complete segments */
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#define TCP_KEEPIDLE 4 /* Start keeplives after this period */
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#define TCP_KEEPINTVL 5 /* Interval between keepalives */
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#define TCP_KEEPCNT 6 /* Number of keepalives before death */
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#define TCP_SYNCNT 7 /* Number of SYN retransmits */
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#define TCP_LINGER2 8 /* Life time of orphaned FIN-WAIT-2 state */
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#define TCP_DEFER_ACCEPT 9 /* Wake up listener only when data arrive */
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#define TCP_WINDOW_CLAMP 10 /* Bound advertised window */
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#define TCP_INFO 11 /* Information about this connection. */
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#define TCP_QUICKACK 12 /* Block/reenable quick acks */
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#define TCP_CONGESTION 13 /* Congestion control algorithm */
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#define TCP_MD5SIG 14 /* TCP MD5 Signature (RFC2385) */
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#define TCP_THIN_LINEAR_TIMEOUTS 16 /* Use linear timeouts for thin streams*/
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#define TCP_THIN_DUPACK 17 /* Fast retrans. after 1 dupack */
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#define TCP_USER_TIMEOUT 18 /* How long for loss retry before timeout */
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#define TCP_REPAIR 19 /* TCP sock is under repair right now */
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#define TCP_REPAIR_QUEUE 20
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#define TCP_QUEUE_SEQ 21
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#define TCP_REPAIR_OPTIONS 22
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#define TCP_FASTOPEN 23 /* Enable FastOpen on listeners */
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#define TCP_TIMESTAMP 24
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#define TCP_NOTSENT_LOWAT 25 /* limit number of unsent bytes in write queue */
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#define TCP_CC_INFO 26 /* Get Congestion Control (optional) info */
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#define TCP_SAVE_SYN 27 /* Record SYN headers for new connections */
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#define TCP_SAVED_SYN 28 /* Get SYN headers recorded for connection */
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#define TCP_REPAIR_WINDOW 29 /* Get/set window parameters */
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#define TCP_FASTOPEN_CONNECT 30 /* Attempt FastOpen with connect */
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#define TCP_ULP 31 /* Attach a ULP to a TCP connection */
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#define TCP_MD5SIG_EXT 32 /* TCP MD5 Signature with extensions */
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struct tcp_repair_opt {
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__u32 opt_code;
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__u32 opt_val;
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};
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struct tcp_repair_window {
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__u32 snd_wl1;
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__u32 snd_wnd;
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__u32 max_window;
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__u32 rcv_wnd;
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__u32 rcv_wup;
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};
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enum {
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TCP_NO_QUEUE,
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TCP_RECV_QUEUE,
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TCP_SEND_QUEUE,
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TCP_QUEUES_NR,
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};
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/* for TCP_INFO socket option */
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#define TCPI_OPT_TIMESTAMPS 1
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#define TCPI_OPT_SACK 2
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#define TCPI_OPT_WSCALE 4
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#define TCPI_OPT_ECN 8 /* ECN was negociated at TCP session init */
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#define TCPI_OPT_ECN_SEEN 16 /* we received at least one packet with ECT */
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#define TCPI_OPT_SYN_DATA 32 /* SYN-ACK acked data in SYN sent or rcvd */
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enum tcp_ca_state {
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TCP_CA_Open = 0,
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#define TCPF_CA_Open (1<<TCP_CA_Open)
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TCP_CA_Disorder = 1,
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#define TCPF_CA_Disorder (1<<TCP_CA_Disorder)
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TCP_CA_CWR = 2,
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#define TCPF_CA_CWR (1<<TCP_CA_CWR)
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TCP_CA_Recovery = 3,
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#define TCPF_CA_Recovery (1<<TCP_CA_Recovery)
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TCP_CA_Loss = 4
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#define TCPF_CA_Loss (1<<TCP_CA_Loss)
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};
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struct tcp_info {
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__u8 tcpi_state;
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__u8 tcpi_ca_state;
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__u8 tcpi_retransmits;
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__u8 tcpi_probes;
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__u8 tcpi_backoff;
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__u8 tcpi_options;
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__u8 tcpi_snd_wscale : 4, tcpi_rcv_wscale : 4;
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__u8 tcpi_delivery_rate_app_limited:1;
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__u32 tcpi_rto;
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__u32 tcpi_ato;
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__u32 tcpi_snd_mss;
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__u32 tcpi_rcv_mss;
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__u32 tcpi_unacked;
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__u32 tcpi_sacked;
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__u32 tcpi_lost;
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__u32 tcpi_retrans;
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__u32 tcpi_fackets;
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/* Times. */
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__u32 tcpi_last_data_sent;
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__u32 tcpi_last_ack_sent; /* Not remembered, sorry. */
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__u32 tcpi_last_data_recv;
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__u32 tcpi_last_ack_recv;
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/* Metrics. */
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__u32 tcpi_pmtu;
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__u32 tcpi_rcv_ssthresh;
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__u32 tcpi_rtt;
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__u32 tcpi_rttvar;
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__u32 tcpi_snd_ssthresh;
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__u32 tcpi_snd_cwnd;
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__u32 tcpi_advmss;
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__u32 tcpi_reordering;
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__u32 tcpi_rcv_rtt;
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__u32 tcpi_rcv_space;
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__u32 tcpi_total_retrans;
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__u64 tcpi_pacing_rate;
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__u64 tcpi_max_pacing_rate;
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__u64 tcpi_bytes_acked; /* RFC4898 tcpEStatsAppHCThruOctetsAcked */
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__u64 tcpi_bytes_received; /* RFC4898 tcpEStatsAppHCThruOctetsReceived */
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__u32 tcpi_segs_out; /* RFC4898 tcpEStatsPerfSegsOut */
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__u32 tcpi_segs_in; /* RFC4898 tcpEStatsPerfSegsIn */
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__u32 tcpi_notsent_bytes;
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__u32 tcpi_min_rtt;
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__u32 tcpi_data_segs_in; /* RFC4898 tcpEStatsDataSegsIn */
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__u32 tcpi_data_segs_out; /* RFC4898 tcpEStatsDataSegsOut */
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__u64 tcpi_delivery_rate;
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__u64 tcpi_busy_time; /* Time (usec) busy sending data */
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__u64 tcpi_rwnd_limited; /* Time (usec) limited by receive window */
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__u64 tcpi_sndbuf_limited; /* Time (usec) limited by send buffer */
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};
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/* netlink attributes types for SCM_TIMESTAMPING_OPT_STATS */
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enum {
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TCP_NLA_PAD,
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TCP_NLA_BUSY, /* Time (usec) busy sending data */
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TCP_NLA_RWND_LIMITED, /* Time (usec) limited by receive window */
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TCP_NLA_SNDBUF_LIMITED, /* Time (usec) limited by send buffer */
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TCP_NLA_DATA_SEGS_OUT, /* Data pkts sent including retransmission */
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TCP_NLA_TOTAL_RETRANS, /* Data pkts retransmitted */
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TCP_NLA_PACING_RATE, /* Pacing rate in bytes per second */
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TCP_NLA_DELIVERY_RATE, /* Delivery rate in bytes per second */
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TCP_NLA_SND_CWND, /* Sending congestion window */
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TCP_NLA_REORDERING, /* Reordering metric */
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TCP_NLA_MIN_RTT, /* minimum RTT */
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TCP_NLA_RECUR_RETRANS, /* Recurring retransmits for the current pkt */
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TCP_NLA_DELIVERY_RATE_APP_LMT, /* delivery rate application limited ? */
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};
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/* for TCP_MD5SIG socket option */
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#define TCP_MD5SIG_MAXKEYLEN 80
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/* tcp_md5sig extension flags for TCP_MD5SIG_EXT */
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#define TCP_MD5SIG_FLAG_PREFIX 1 /* address prefix length */
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struct tcp_md5sig {
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struct __kernel_sockaddr_storage tcpm_addr; /* address associated */
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__u8 tcpm_flags; /* extension flags */
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__u8 tcpm_prefixlen; /* address prefix */
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__u16 tcpm_keylen; /* key length */
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__u32 __tcpm_pad; /* zero */
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__u8 tcpm_key[TCP_MD5SIG_MAXKEYLEN]; /* key (binary) */
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};
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/* INET_DIAG_MD5SIG */
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struct tcp_diag_md5sig {
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__u8 tcpm_family;
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__u8 tcpm_prefixlen;
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__u16 tcpm_keylen;
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__be32 tcpm_addr[4];
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__u8 tcpm_key[TCP_MD5SIG_MAXKEYLEN];
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};
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#endif /* _UAPI_LINUX_TCP_H */
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