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

/*
 * 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 */

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;
};

/* 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 */
Commit	Line	Data
607ca46e DH	1	/*
	2	* INET An implementation of the TCP/IP protocol suite for the LINUX
	3	* operating system. INET is implemented using the BSD Socket
	4	* interface as the means of communication with the user level.
	5	*
	6	* Definitions for the TCP protocol.
	7	*
	8	* Version: @(#)tcp.h 1.0.2 04/28/93
	9	*
	10	* Author: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
	11	*
	12	* This program is free software; you can redistribute it and/or
	13	* modify it under the terms of the GNU General Public License
	14	* as published by the Free Software Foundation; either version
	15	* 2 of the License, or (at your option) any later version.
	16	*/
	17	#ifndef _UAPI_LINUX_TCP_H
	18	#define _UAPI_LINUX_TCP_H
	19
	20	#include <linux/types.h>
	21	#include <asm/byteorder.h>
	22	#include <linux/socket.h>
	23
	24	struct tcphdr {
	25	__be16 source;
	26	__be16 dest;
	27	__be32 seq;
	28	__be32 ack_seq;
	29	#if defined(__LITTLE_ENDIAN_BITFIELD)
	30	__u16 res1:4,
	31	doff:4,
	32	fin:1,
	33	syn:1,
	34	rst:1,
	35	psh:1,
	36	ack:1,
	37	urg:1,
	38	ece:1,
	39	cwr:1;
	40	#elif defined(__BIG_ENDIAN_BITFIELD)
	41	__u16 doff:4,
	42	res1:4,
	43	cwr:1,
	44	ece:1,
	45	urg:1,
	46	ack:1,
	47	psh:1,
	48	rst:1,
	49	syn:1,
	50	fin:1;
	51	#else
	52	#error "Adjust your <asm/byteorder.h> defines"
	53	#endif
	54	__be16 window;
	55	__sum16 check;
	56	__be16 urg_ptr;
	57	};
	58
	59	/*
	60	* The union cast uses a gcc extension to avoid aliasing problems
	61	* (union is compatible to any of its members)
	62	* This means this part of the code is -fstrict-aliasing safe now.
	63	*/
	64	union tcp_word_hdr {
65	struct tcphdr hdr;
66	__be32 words[5];
67	};
68
69	#define tcp_flag_word(tp) ( ((union tcp_word_hdr *)(tp))->words [3])
70
71	enum {
72	TCP_FLAG_CWR = __constant_cpu_to_be32(0x00800000),
73	TCP_FLAG_ECE = __constant_cpu_to_be32(0x00400000),
74	TCP_FLAG_URG = __constant_cpu_to_be32(0x00200000),
75	TCP_FLAG_ACK = __constant_cpu_to_be32(0x00100000),
76	TCP_FLAG_PSH = __constant_cpu_to_be32(0x00080000),
77	TCP_FLAG_RST = __constant_cpu_to_be32(0x00040000),
78	TCP_FLAG_SYN = __constant_cpu_to_be32(0x00020000),
79	TCP_FLAG_FIN = __constant_cpu_to_be32(0x00010000),
80	TCP_RESERVED_BITS = __constant_cpu_to_be32(0x0F000000),
81	TCP_DATA_OFFSET = __constant_cpu_to_be32(0xF0000000)
82	};
83
84	/*
85	* TCP general constants
86	*/
87	#define TCP_MSS_DEFAULT 536U /* IPv4 (RFC1122, RFC2581) */
88	#define TCP_MSS_DESIRED 1220U /* IPv6 (tunneled), EDNS0 (RFC3226) */
89
90	/* TCP socket options */
91	#define TCP_NODELAY 1 /* Turn off Nagle's algorithm. */
92	#define TCP_MAXSEG 2 /* Limit MSS */
93	#define TCP_CORK 3 /* Never send partially complete segments */
94	#define TCP_KEEPIDLE 4 /* Start keeplives after this period */
95	#define TCP_KEEPINTVL 5 /* Interval between keepalives */
96	#define TCP_KEEPCNT 6 /* Number of keepalives before death */
97	#define TCP_SYNCNT 7 /* Number of SYN retransmits */
98	#define TCP_LINGER2 8 /* Life time of orphaned FIN-WAIT-2 state */
99	#define TCP_DEFER_ACCEPT 9 /* Wake up listener only when data arrive */
100	#define TCP_WINDOW_CLAMP 10 /* Bound advertised window */
101	#define TCP_INFO 11 /* Information about this connection. */
102	#define TCP_QUICKACK 12 /* Block/reenable quick acks */
103	#define TCP_CONGESTION 13 /* Congestion control algorithm */
104	#define TCP_MD5SIG 14 /* TCP MD5 Signature (RFC2385) */
607ca46e DH	105	#define TCP_THIN_LINEAR_TIMEOUTS 16 /* Use linear timeouts for thin streams*/
	106	#define TCP_THIN_DUPACK 17 /* Fast retrans. after 1 dupack */
	107	#define TCP_USER_TIMEOUT 18 /* How long for loss retry before timeout */
	108	#define TCP_REPAIR 19 /* TCP sock is under repair right now */
	109	#define TCP_REPAIR_QUEUE 20
	110	#define TCP_QUEUE_SEQ 21
	111	#define TCP_REPAIR_OPTIONS 22
	112	#define TCP_FASTOPEN 23 /* Enable FastOpen on listeners */
93be6ce0	113	#define TCP_TIMESTAMP 24
c9bee3b7	114	#define TCP_NOTSENT_LOWAT 25 /* limit number of unsent bytes in write queue */
607ca46e DH	115
	116	struct tcp_repair_opt {
	117	__u32 opt_code;
	118	__u32 opt_val;
	119	};
	120
	121	enum {
	122	TCP_NO_QUEUE,
	123	TCP_RECV_QUEUE,
	124	TCP_SEND_QUEUE,
	125	TCP_QUEUES_NR,
	126	};
	127
	128	/* for TCP_INFO socket option */
	129	#define TCPI_OPT_TIMESTAMPS 1
	130	#define TCPI_OPT_SACK 2
	131	#define TCPI_OPT_WSCALE 4
	132	#define TCPI_OPT_ECN 8 /* ECN was negociated at TCP session init */
	133	#define TCPI_OPT_ECN_SEEN 16 /* we received at least one packet with ECT */
6f73601e	134	#define TCPI_OPT_SYN_DATA 32 /* SYN-ACK acked data in SYN sent or rcvd */
607ca46e DH	135
	136	enum tcp_ca_state {
	137	TCP_CA_Open = 0,
	138	#define TCPF_CA_Open (1<<TCP_CA_Open)
	139	TCP_CA_Disorder = 1,
	140	#define TCPF_CA_Disorder (1<<TCP_CA_Disorder)
	141	TCP_CA_CWR = 2,
	142	#define TCPF_CA_CWR (1<<TCP_CA_CWR)
	143	TCP_CA_Recovery = 3,
	144	#define TCPF_CA_Recovery (1<<TCP_CA_Recovery)
	145	TCP_CA_Loss = 4
	146	#define TCPF_CA_Loss (1<<TCP_CA_Loss)
	147	};
	148
	149	struct tcp_info {
	150	__u8 tcpi_state;
	151	__u8 tcpi_ca_state;
	152	__u8 tcpi_retransmits;
	153	__u8 tcpi_probes;
	154	__u8 tcpi_backoff;
	155	__u8 tcpi_options;
	156	__u8 tcpi_snd_wscale : 4, tcpi_rcv_wscale : 4;
	157
	158	__u32 tcpi_rto;
	159	__u32 tcpi_ato;
	160	__u32 tcpi_snd_mss;
	161	__u32 tcpi_rcv_mss;
	162
	163	__u32 tcpi_unacked;
	164	__u32 tcpi_sacked;
	165	__u32 tcpi_lost;
	166	__u32 tcpi_retrans;
	167	__u32 tcpi_fackets;
	168
	169	/* Times. */
	170	__u32 tcpi_last_data_sent;
	171	__u32 tcpi_last_ack_sent; /* Not remembered, sorry. */
	172	__u32 tcpi_last_data_recv;
	173	__u32 tcpi_last_ack_recv;
	174
	175	/* Metrics. */
	176	__u32 tcpi_pmtu;
	177	__u32 tcpi_rcv_ssthresh;
	178	__u32 tcpi_rtt;
	179	__u32 tcpi_rttvar;
	180	__u32 tcpi_snd_ssthresh;
	181	__u32 tcpi_snd_cwnd;
	182	__u32 tcpi_advmss;
	183	__u32 tcpi_reordering;
	184
	185	__u32 tcpi_rcv_rtt;
	186	__u32 tcpi_rcv_space;
	187
	188	__u32 tcpi_total_retrans;
977cb0ec ED	189
	190	__u64 tcpi_pacing_rate;
	191	__u64 tcpi_max_pacing_rate;
607ca46e DH	192	};
	193
	194	/* for TCP_MD5SIG socket option */
	195	#define TCP_MD5SIG_MAXKEYLEN 80
	196
	197	struct tcp_md5sig {
	198	struct __kernel_sockaddr_storage tcpm_addr; /* address associated */
	199	__u16 __tcpm_pad1; /* zero */
	200	__u16 tcpm_keylen; /* key length */
	201	__u32 __tcpm_pad2; /* zero */
	202	__u8 tcpm_key[TCP_MD5SIG_MAXKEYLEN]; /* key (binary) */
	203	};
	204
607ca46e	205	#endif /* _UAPI_LINUX_TCP_H */