[linux-2.6-block.git] / include / uapi / linux / tcp.h

/* 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_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,
};

/* 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;

	__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 */
};

/* 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 */
};

/* for TCP_MD5SIG socket option */
#define TCP_MD5SIG_MAXKEYLEN	80

/* tcp_md5sig extension flags for TCP_MD5SIG_EXT */
#define TCP_MD5SIG_FLAG_PREFIX		1	/* address prefix length */

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 */
	__u32	__tcpm_pad;				/* zero */
	__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, ...) */

struct 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 */
};
#endif /* _UAPI_LINUX_TCP_H */
Commit	Line	Data
e2be04c7	1	/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
607ca46e DH	2	/*
	3	* INET An implementation of the TCP/IP protocol suite for the LINUX
	4	* operating system. INET is implemented using the BSD Socket
	5	* interface as the means of communication with the user level.
	6	*
	7	* Definitions for the TCP protocol.
	8	*
	9	* Version: @(#)tcp.h 1.0.2 04/28/93
	10	*
	11	* Author: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
	12	*
	13	* This program is free software; you can redistribute it and/or
	14	* modify it under the terms of the GNU General Public License
	15	* as published by the Free Software Foundation; either version
	16	* 2 of the License, or (at your option) any later version.
	17	*/
	18	#ifndef _UAPI_LINUX_TCP_H
	19	#define _UAPI_LINUX_TCP_H
	20
	21	#include <linux/types.h>
	22	#include <asm/byteorder.h>
	23	#include <linux/socket.h>
	24
	25	struct tcphdr {
	26	__be16 source;
	27	__be16 dest;
	28	__be32 seq;
	29	__be32 ack_seq;
	30	#if defined(__LITTLE_ENDIAN_BITFIELD)
	31	__u16 res1:4,
	32	doff:4,
	33	fin:1,
	34	syn:1,
	35	rst:1,
	36	psh:1,
	37	ack:1,
	38	urg:1,
	39	ece:1,
	40	cwr:1;
	41	#elif defined(__BIG_ENDIAN_BITFIELD)
	42	__u16 doff:4,
	43	res1:4,
	44	cwr:1,
	45	ece:1,
	46	urg:1,
	47	ack:1,
	48	psh:1,
	49	rst:1,
	50	syn:1,
	51	fin:1;
	52	#else
	53	#error "Adjust your <asm/byteorder.h> defines"
	54	#endif
	55	__be16 window;
	56	__sum16 check;
	57	__be16 urg_ptr;
	58	};
	59
	60	/*
	61	* The union cast uses a gcc extension to avoid aliasing problems
	62	* (union is compatible to any of its members)
	63	* This means this part of the code is -fstrict-aliasing safe now.
	64	*/
	65	union tcp_word_hdr {
66	struct tcphdr hdr;
67	__be32 words[5];
68	};
69
70	#define tcp_flag_word(tp) ( ((union tcp_word_hdr *)(tp))->words [3])
71
72	enum {
73	TCP_FLAG_CWR = __constant_cpu_to_be32(0x00800000),
74	TCP_FLAG_ECE = __constant_cpu_to_be32(0x00400000),
75	TCP_FLAG_URG = __constant_cpu_to_be32(0x00200000),
76	TCP_FLAG_ACK = __constant_cpu_to_be32(0x00100000),
77	TCP_FLAG_PSH = __constant_cpu_to_be32(0x00080000),
78	TCP_FLAG_RST = __constant_cpu_to_be32(0x00040000),
79	TCP_FLAG_SYN = __constant_cpu_to_be32(0x00020000),
80	TCP_FLAG_FIN = __constant_cpu_to_be32(0x00010000),
81	TCP_RESERVED_BITS = __constant_cpu_to_be32(0x0F000000),
82	TCP_DATA_OFFSET = __constant_cpu_to_be32(0xF0000000)
83	};
84
85	/*
86	* TCP general constants
87	*/
88	#define TCP_MSS_DEFAULT 536U /* IPv4 (RFC1122, RFC2581) */
89	#define TCP_MSS_DESIRED 1220U /* IPv6 (tunneled), EDNS0 (RFC3226) */
90
91	/* TCP socket options */
92	#define TCP_NODELAY 1 /* Turn off Nagle's algorithm. */
93	#define TCP_MAXSEG 2 /* Limit MSS */
94	#define TCP_CORK 3 /* Never send partially complete segments */
95	#define TCP_KEEPIDLE 4 /* Start keeplives after this period */
96	#define TCP_KEEPINTVL 5 /* Interval between keepalives */
97	#define TCP_KEEPCNT 6 /* Number of keepalives before death */
98	#define TCP_SYNCNT 7 /* Number of SYN retransmits */
99	#define TCP_LINGER2 8 /* Life time of orphaned FIN-WAIT-2 state */
100	#define TCP_DEFER_ACCEPT 9 /* Wake up listener only when data arrive */
101	#define TCP_WINDOW_CLAMP 10 /* Bound advertised window */
102	#define TCP_INFO 11 /* Information about this connection. */
103	#define TCP_QUICKACK 12 /* Block/reenable quick acks */
104	#define TCP_CONGESTION 13 /* Congestion control algorithm */
105	#define TCP_MD5SIG 14 /* TCP MD5 Signature (RFC2385) */
607ca46e DH	106	#define TCP_THIN_LINEAR_TIMEOUTS 16 /* Use linear timeouts for thin streams*/
	107	#define TCP_THIN_DUPACK 17 /* Fast retrans. after 1 dupack */
	108	#define TCP_USER_TIMEOUT 18 /* How long for loss retry before timeout */
	109	#define TCP_REPAIR 19 /* TCP sock is under repair right now */
	110	#define TCP_REPAIR_QUEUE 20
	111	#define TCP_QUEUE_SEQ 21
	112	#define TCP_REPAIR_OPTIONS 22
	113	#define TCP_FASTOPEN 23 /* Enable FastOpen on listeners */
93be6ce0	114	#define TCP_TIMESTAMP 24
c9bee3b7	115	#define TCP_NOTSENT_LOWAT 25 /* limit number of unsent bytes in write queue */
6e9250f5	116	#define TCP_CC_INFO 26 /* Get Congestion Control (optional) info */
cd8ae852 ED	117	#define TCP_SAVE_SYN 27 /* Record SYN headers for new connections */
cd8ae852 ED	118	#define TCP_SAVED_SYN 28 /* Get SYN headers recorded for connection */
b1ed4c4f	119	#define TCP_REPAIR_WINDOW 29 /* Get/set window parameters */
19f6d3f3	120	#define TCP_FASTOPEN_CONNECT 30 /* Attempt FastOpen with connect */
8917a777 ID	121	#define TCP_ULP 31 /* Attach a ULP to a TCP connection */
8917a777 ID	122	#define TCP_MD5SIG_EXT 32 /* TCP MD5 Signature with extensions */
1fba70e5	123	#define TCP_FASTOPEN_KEY 33 /* Set the key for Fast Open (cookie) */
71c02379	124	#define TCP_FASTOPEN_NO_COOKIE 34 /* Enable TFO without a TFO cookie */
05255b82	125	#define TCP_ZEROCOPY_RECEIVE 35
b75eba76 SHY	126	#define TCP_INQ 36 /* Notify bytes available to read as a cmsg on read */
	127
	128	#define TCP_CM_INQ TCP_INQ
607ca46e	129
31048d7a SB	130	#define TCP_REPAIR_ON 1
	131	#define TCP_REPAIR_OFF 0
	132	#define TCP_REPAIR_OFF_NO_WP -1 /* Turn off without window probes */
	133
607ca46e DH	134	struct tcp_repair_opt {
	135	__u32 opt_code;
	136	__u32 opt_val;
	137	};
	138
b1ed4c4f AV	139	struct tcp_repair_window {
	140	__u32 snd_wl1;
	141	__u32 snd_wnd;
	142	__u32 max_window;
	143
	144	__u32 rcv_wnd;
	145	__u32 rcv_wup;
	146	};
	147
607ca46e DH	148	enum {
	149	TCP_NO_QUEUE,
	150	TCP_RECV_QUEUE,
	151	TCP_SEND_QUEUE,
	152	TCP_QUEUES_NR,
	153	};
	154
	155	/* for TCP_INFO socket option */
	156	#define TCPI_OPT_TIMESTAMPS 1
	157	#define TCPI_OPT_SACK 2
	158	#define TCPI_OPT_WSCALE 4
	159	#define TCPI_OPT_ECN 8 /* ECN was negociated at TCP session init */
	160	#define TCPI_OPT_ECN_SEEN 16 /* we received at least one packet with ECT */
6f73601e	161	#define TCPI_OPT_SYN_DATA 32 /* SYN-ACK acked data in SYN sent or rcvd */
607ca46e DH	162
	163	enum tcp_ca_state {
	164	TCP_CA_Open = 0,
	165	#define TCPF_CA_Open (1<<TCP_CA_Open)
	166	TCP_CA_Disorder = 1,
	167	#define TCPF_CA_Disorder (1<<TCP_CA_Disorder)
	168	TCP_CA_CWR = 2,
	169	#define TCPF_CA_CWR (1<<TCP_CA_CWR)
	170	TCP_CA_Recovery = 3,
	171	#define TCPF_CA_Recovery (1<<TCP_CA_Recovery)
	172	TCP_CA_Loss = 4
	173	#define TCPF_CA_Loss (1<<TCP_CA_Loss)
	174	};
	175
	176	struct tcp_info {
	177	__u8 tcpi_state;
	178	__u8 tcpi_ca_state;
	179	__u8 tcpi_retransmits;
	180	__u8 tcpi_probes;
	181	__u8 tcpi_backoff;
	182	__u8 tcpi_options;
	183	__u8 tcpi_snd_wscale : 4, tcpi_rcv_wscale : 4;
eb8329e0	184	__u8 tcpi_delivery_rate_app_limited:1;
607ca46e DH	185
	186	__u32 tcpi_rto;
	187	__u32 tcpi_ato;
	188	__u32 tcpi_snd_mss;
	189	__u32 tcpi_rcv_mss;
	190
	191	__u32 tcpi_unacked;
	192	__u32 tcpi_sacked;
	193	__u32 tcpi_lost;
	194	__u32 tcpi_retrans;
	195	__u32 tcpi_fackets;
	196
	197	/* Times. */
	198	__u32 tcpi_last_data_sent;
	199	__u32 tcpi_last_ack_sent; /* Not remembered, sorry. */
	200	__u32 tcpi_last_data_recv;
	201	__u32 tcpi_last_ack_recv;
	202
	203	/* Metrics. */
	204	__u32 tcpi_pmtu;
	205	__u32 tcpi_rcv_ssthresh;
	206	__u32 tcpi_rtt;
	207	__u32 tcpi_rttvar;
	208	__u32 tcpi_snd_ssthresh;
	209	__u32 tcpi_snd_cwnd;
	210	__u32 tcpi_advmss;
	211	__u32 tcpi_reordering;
	212
	213	__u32 tcpi_rcv_rtt;
	214	__u32 tcpi_rcv_space;
	215
	216	__u32 tcpi_total_retrans;
977cb0ec ED	217
	218	__u64 tcpi_pacing_rate;
	219	__u64 tcpi_max_pacing_rate;
2efd055c	220	__u64 tcpi_bytes_acked; /* RFC4898 tcpEStatsAppHCThruOctetsAcked */
bdd1f9ed	221	__u64 tcpi_bytes_received; /* RFC4898 tcpEStatsAppHCThruOctetsReceived */
2efd055c MRL	222	__u32 tcpi_segs_out; /* RFC4898 tcpEStatsPerfSegsOut */
2efd055c MRL	223	__u32 tcpi_segs_in; /* RFC4898 tcpEStatsPerfSegsIn */
cd9b2660 ED	224
	225	__u32 tcpi_notsent_bytes;
	226	__u32 tcpi_min_rtt;
a44d6eac MKL	227	__u32 tcpi_data_segs_in; /* RFC4898 tcpEStatsDataSegsIn */
a44d6eac MKL	228	__u32 tcpi_data_segs_out; /* RFC4898 tcpEStatsDataSegsOut */
eb8329e0 YC	229
eb8329e0 YC	230	__u64 tcpi_delivery_rate;
efd90174 FY	231
	232	__u64 tcpi_busy_time; /* Time (usec) busy sending data */
	233	__u64 tcpi_rwnd_limited; /* Time (usec) limited by receive window */
	234	__u64 tcpi_sndbuf_limited; /* Time (usec) limited by send buffer */
feb5f2ec YC	235
	236	__u32 tcpi_delivered;
	237	__u32 tcpi_delivered_ce;
ba113c3a WW	238
ba113c3a WW	239	__u64 tcpi_bytes_sent; /* RFC4898 tcpEStatsPerfHCDataOctetsOut */
fb31c9b9	240	__u64 tcpi_bytes_retrans; /* RFC4898 tcpEStatsPerfOctetsRetrans */
7e10b655	241	__u32 tcpi_dsack_dups; /* RFC4898 tcpEStatsStackDSACKDups */
7ec65372	242	__u32 tcpi_reord_seen; /* reordering events seen */
607ca46e DH	243	};
607ca46e DH	244
1c885808 FY	245	/* netlink attributes types for SCM_TIMESTAMPING_OPT_STATS */
	246	enum {
	247	TCP_NLA_PAD,
	248	TCP_NLA_BUSY, /* Time (usec) busy sending data */
	249	TCP_NLA_RWND_LIMITED, /* Time (usec) limited by receive window */
	250	TCP_NLA_SNDBUF_LIMITED, /* Time (usec) limited by send buffer */
7e98102f YC	251	TCP_NLA_DATA_SEGS_OUT, /* Data pkts sent including retransmission */
7e98102f YC	252	TCP_NLA_TOTAL_RETRANS, /* Data pkts retransmitted */
bb7c19f9 WW	253	TCP_NLA_PACING_RATE, /* Pacing rate in bytes per second */
	254	TCP_NLA_DELIVERY_RATE, /* Delivery rate in bytes per second */
	255	TCP_NLA_SND_CWND, /* Sending congestion window */
	256	TCP_NLA_REORDERING, /* Reordering metric */
	257	TCP_NLA_MIN_RTT, /* minimum RTT */
	258	TCP_NLA_RECUR_RETRANS, /* Recurring retransmits for the current pkt */
	259	TCP_NLA_DELIVERY_RATE_APP_LMT, /* delivery rate application limited ? */
87ecc95d	260	TCP_NLA_SNDQ_SIZE, /* Data (bytes) pending in send queue */
be631892	261	TCP_NLA_CA_STATE, /* ca_state of socket */
7156d194	262	TCP_NLA_SND_SSTHRESH, /* Slow start size threshold */
feb5f2ec YC	263	TCP_NLA_DELIVERED, /* Data pkts delivered incl. out-of-order */
feb5f2ec YC	264	TCP_NLA_DELIVERED_CE, /* Like above but only ones w/ CE marks */
ba113c3a	265	TCP_NLA_BYTES_SENT, /* Data bytes sent including retransmission */
fb31c9b9	266	TCP_NLA_BYTES_RETRANS, /* Data bytes retransmitted */
7e10b655	267	TCP_NLA_DSACK_DUPS, /* DSACK blocks received */
7ec65372	268	TCP_NLA_REORD_SEEN, /* reordering events seen */
e8bd8fca	269	TCP_NLA_SRTT, /* smoothed RTT in usecs */
1c885808 FY	270	};
1c885808 FY	271
607ca46e DH	272	/* for TCP_MD5SIG socket option */
	273	#define TCP_MD5SIG_MAXKEYLEN 80
	274
8917a777 ID	275	/* tcp_md5sig extension flags for TCP_MD5SIG_EXT */
	276	#define TCP_MD5SIG_FLAG_PREFIX 1 /* address prefix length */
	277
607ca46e DH	278	struct tcp_md5sig {
607ca46e DH	279	struct __kernel_sockaddr_storage tcpm_addr; /* address associated */
8917a777 ID	280	__u8 tcpm_flags; /* extension flags */
8917a777 ID	281	__u8 tcpm_prefixlen; /* address prefix */
607ca46e	282	__u16 tcpm_keylen; /* key length */
8917a777	283	__u32 __tcpm_pad; /* zero */
607ca46e DH	284	__u8 tcpm_key[TCP_MD5SIG_MAXKEYLEN]; /* key (binary) */
	285	};
	286
c03fa9bc ID	287	/* INET_DIAG_MD5SIG */
	288	struct tcp_diag_md5sig {
	289	__u8 tcpm_family;
	290	__u8 tcpm_prefixlen;
	291	__u16 tcpm_keylen;
	292	__be32 tcpm_addr[4];
	293	__u8 tcpm_key[TCP_MD5SIG_MAXKEYLEN];
	294	};
	295
05255b82 ED	296	/* setsockopt(fd, IPPROTO_TCP, TCP_ZEROCOPY_RECEIVE, ...) */
	297
	298	struct tcp_zerocopy_receive {
	299	__u64 address; /* in: address of mapping */
	300	__u32 length; /* in/out: number of bytes to map/mapped */
	301	__u32 recv_skip_hint; /* out: amount of bytes to skip */
	302	};
607ca46e	303	#endif /* _UAPI_LINUX_TCP_H */