Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 448 insertions, 0 deletions

diff --git a/include/linux/tcp.h b/include/linux/tcp.h
new file mode 100644
index 0000000..14a55e3
--- /dev/null
+++ b/include/linux/tcp.h
@@ -0,0 +1,448 @@
+/*
+ * 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 _LINUX_TCP_H
+#define _LINUX_TCP_H
+
+#include <linux/types.h>
+#include <asm/byteorder.h>
+
+struct tcphdr {
+	__u16	source;
+	__u16	dest;
+	__u32	seq;
+	__u32	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	
+	__u16	window;
+	__u16	check;
+	__u16	urg_ptr;
+};
+
+
+enum {
+  TCP_ESTABLISHED = 1,
+  TCP_SYN_SENT,
+  TCP_SYN_RECV,
+  TCP_FIN_WAIT1,
+  TCP_FIN_WAIT2,
+  TCP_TIME_WAIT,
+  TCP_CLOSE,
+  TCP_CLOSE_WAIT,
+  TCP_LAST_ACK,
+  TCP_LISTEN,
+  TCP_CLOSING,	 /* now a valid state */
+
+  TCP_MAX_STATES /* Leave at the end! */
+};
+
+#define TCP_STATE_MASK	0xF
+#define TCP_ACTION_FIN	(1 << 7)
+
+enum {
+  TCPF_ESTABLISHED = (1 << 1),
+  TCPF_SYN_SENT  = (1 << 2),
+  TCPF_SYN_RECV  = (1 << 3),
+  TCPF_FIN_WAIT1 = (1 << 4),
+  TCPF_FIN_WAIT2 = (1 << 5),
+  TCPF_TIME_WAIT = (1 << 6),
+  TCPF_CLOSE     = (1 << 7),
+  TCPF_CLOSE_WAIT = (1 << 8),
+  TCPF_LAST_ACK  = (1 << 9),
+  TCPF_LISTEN    = (1 << 10),
+  TCPF_CLOSING   = (1 << 11) 
+};
+
+/*
+ *	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;
+	__u32 		  words[5];
+}; 
+
+#define tcp_flag_word(tp) ( ((union tcp_word_hdr *)(tp))->words [3]) 
+
+enum { 
+	TCP_FLAG_CWR = __constant_htonl(0x00800000), 
+	TCP_FLAG_ECE = __constant_htonl(0x00400000), 
+	TCP_FLAG_URG = __constant_htonl(0x00200000), 
+	TCP_FLAG_ACK = __constant_htonl(0x00100000), 
+	TCP_FLAG_PSH = __constant_htonl(0x00080000), 
+	TCP_FLAG_RST = __constant_htonl(0x00040000), 
+	TCP_FLAG_SYN = __constant_htonl(0x00020000), 
+	TCP_FLAG_FIN = __constant_htonl(0x00010000),
+	TCP_RESERVED_BITS = __constant_htonl(0x0F000000),
+	TCP_DATA_OFFSET = __constant_htonl(0xF0000000)
+}; 
+
+/* 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 TCPI_OPT_TIMESTAMPS	1
+#define TCPI_OPT_SACK		2
+#define TCPI_OPT_WSCALE		4
+#define TCPI_OPT_ECN		8
+
+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;
+};
+
+#ifdef __KERNEL__
+
+#include <linux/config.h>
+#include <linux/skbuff.h>
+#include <linux/ip.h>
+#include <net/sock.h>
+
+/* This defines a selective acknowledgement block. */
+struct tcp_sack_block {
+	__u32	start_seq;
+	__u32	end_seq;
+};
+
+enum tcp_congestion_algo {
+	TCP_RENO=0,
+	TCP_VEGAS,
+	TCP_WESTWOOD,
+	TCP_BIC,
+};
+
+struct tcp_options_received {
+/*	PAWS/RTTM data	*/
+	long	ts_recent_stamp;/* Time we stored ts_recent (for aging) */
+	__u32	ts_recent;	/* Time stamp to echo next		*/
+	__u32	rcv_tsval;	/* Time stamp value             	*/
+	__u32	rcv_tsecr;	/* Time stamp echo reply        	*/
+	__u16 	saw_tstamp : 1,	/* Saw TIMESTAMP on last packet		*/
+		tstamp_ok : 1,	/* TIMESTAMP seen on SYN packet		*/
+		dsack : 1,	/* D-SACK is scheduled			*/
+		wscale_ok : 1,	/* Wscale seen on SYN packet		*/
+		sack_ok : 4,	/* SACK seen on SYN packet		*/
+		snd_wscale : 4,	/* Window scaling received from sender	*/
+		rcv_wscale : 4;	/* Window scaling to send to receiver	*/
+/*	SACKs data	*/
+	__u8	eff_sacks;	/* Size of SACK array to send with next packet */
+	__u8	num_sacks;	/* Number of SACK blocks		*/
+	__u16	user_mss;  	/* mss requested by user in ioctl */
+	__u16	mss_clamp;	/* Maximal mss, negotiated at connection setup */
+};
+
+struct tcp_sock {
+	/* inet_sock has to be the first member of tcp_sock */
+	struct inet_sock	inet;
+	int	tcp_header_len;	/* Bytes of tcp header to send		*/
+
+/*
+ *	Header prediction flags
+ *	0x5?10 << 16 + snd_wnd in net byte order
+ */
+	__u32	pred_flags;
+
+/*
+ *	RFC793 variables by their proper names. This means you can
+ *	read the code and the spec side by side (and laugh ...)
+ *	See RFC793 and RFC1122. The RFC writes these in capitals.
+ */
+ 	__u32	rcv_nxt;	/* What we want to receive next 	*/
+ 	__u32	snd_nxt;	/* Next sequence we send		*/
+
+ 	__u32	snd_una;	/* First byte we want an ack for	*/
+ 	__u32	snd_sml;	/* Last byte of the most recently transmitted small packet */
+	__u32	rcv_tstamp;	/* timestamp of last received ACK (for keepalives) */
+	__u32	lsndtime;	/* timestamp of last sent data packet (for restart window) */
+	struct tcp_bind_bucket *bind_hash;
+	/* Delayed ACK control data */
+	struct {
+		__u8	pending;	/* ACK is pending */
+		__u8	quick;		/* Scheduled number of quick acks	*/
+		__u8	pingpong;	/* The session is interactive		*/
+		__u8	blocked;	/* Delayed ACK was blocked by socket lock*/
+		__u32	ato;		/* Predicted tick of soft clock		*/
+		unsigned long timeout;	/* Currently scheduled timeout		*/
+		__u32	lrcvtime;	/* timestamp of last received data packet*/
+		__u16	last_seg_size;	/* Size of last incoming segment	*/
+		__u16	rcv_mss;	/* MSS used for delayed ACK decisions	*/ 
+	} ack;
+
+	/* Data for direct copy to user */
+	struct {
+		struct sk_buff_head	prequeue;
+		struct task_struct	*task;
+		struct iovec		*iov;
+		int			memory;
+		int			len;
+	} ucopy;
+
+	__u32	snd_wl1;	/* Sequence for window update		*/
+	__u32	snd_wnd;	/* The window we expect to receive	*/
+	__u32	max_window;	/* Maximal window ever seen from peer	*/
+	__u32	pmtu_cookie;	/* Last pmtu seen by socket		*/
+	__u32	mss_cache;	/* Cached effective mss, not including SACKS */
+	__u16	mss_cache_std;	/* Like mss_cache, but without TSO */
+	__u16	ext_header_len;	/* Network protocol overhead (IP/IPv6 options) */
+	__u8	ca_state;	/* State of fast-retransmit machine 	*/
+	__u8	retransmits;	/* Number of unrecovered RTO timeouts.	*/
+
+	__u16	advmss;		/* Advertised MSS			*/
+	__u32	window_clamp;	/* Maximal window to advertise		*/
+	__u32	rcv_ssthresh;	/* Current window clamp			*/
+
+	__u32	frto_highmark;	/* snd_nxt when RTO occurred */
+	__u8	reordering;	/* Packet reordering metric.		*/
+	__u8	frto_counter;	/* Number of new acks after RTO */
+
+	__u8	adv_cong;	/* Using Vegas, Westwood, or BIC */
+	__u8	defer_accept;	/* User waits for some data after accept() */
+
+/* RTT measurement */
+	__u32	srtt;		/* smoothed round trip time << 3	*/
+	__u32	mdev;		/* medium deviation			*/
+	__u32	mdev_max;	/* maximal mdev for the last rtt period	*/
+	__u32	rttvar;		/* smoothed mdev_max			*/
+	__u32	rtt_seq;	/* sequence number to update rttvar	*/
+	__u32	rto;		/* retransmit timeout			*/
+
+	__u32	packets_out;	/* Packets which are "in flight"	*/
+	__u32	left_out;	/* Packets which leaved network	*/
+	__u32	retrans_out;	/* Retransmitted packets out		*/
+	__u8	backoff;	/* backoff				*/
+/*
+ *      Options received (usually on last packet, some only on SYN packets).
+ */
+	__u8	nonagle;	/* Disable Nagle algorithm?             */
+	__u8	keepalive_probes; /* num of allowed keep alive probes	*/
+
+	__u8	probes_out;	/* unanswered 0 window probes		*/
+	struct tcp_options_received rx_opt;
+
+/*
+ *	Slow start and congestion control (see also Nagle, and Karn & Partridge)
+ */
+ 	__u32	snd_ssthresh;	/* Slow start size threshold		*/
+ 	__u32	snd_cwnd;	/* Sending congestion window		*/
+ 	__u16	snd_cwnd_cnt;	/* Linear increase counter		*/
+	__u16	snd_cwnd_clamp; /* Do not allow snd_cwnd to grow above this */
+	__u32	snd_cwnd_used;
+	__u32	snd_cwnd_stamp;
+
+	/* Two commonly used timers in both sender and receiver paths. */
+	unsigned long		timeout;
+ 	struct timer_list	retransmit_timer;	/* Resend (no ack)	*/
+ 	struct timer_list	delack_timer;		/* Ack delay 		*/
+
+	struct sk_buff_head	out_of_order_queue; /* Out of order segments go here */
+
+	struct tcp_func		*af_specific;	/* Operations which are AF_INET{4,6} specific	*/
+
+ 	__u32	rcv_wnd;	/* Current receiver window		*/
+	__u32	rcv_wup;	/* rcv_nxt on last window update sent	*/
+	__u32	write_seq;	/* Tail(+1) of data held in tcp send buffer */
+	__u32	pushed_seq;	/* Last pushed seq, required to talk to windows */
+	__u32	copied_seq;	/* Head of yet unread data		*/
+
+/*	SACKs data	*/
+	struct tcp_sack_block duplicate_sack[1]; /* D-SACK block */
+	struct tcp_sack_block selective_acks[4]; /* The SACKS themselves*/
+
+	__u8	syn_retries;	/* num of allowed syn retries */
+	__u8	ecn_flags;	/* ECN status bits.			*/
+	__u16	prior_ssthresh; /* ssthresh saved at recovery start	*/
+	__u32	lost_out;	/* Lost packets			*/
+	__u32	sacked_out;	/* SACK'd packets			*/
+	__u32	fackets_out;	/* FACK'd packets			*/
+	__u32	high_seq;	/* snd_nxt at onset of congestion	*/
+
+	__u32	retrans_stamp;	/* Timestamp of the last retransmit,
+				 * also used in SYN-SENT to remember stamp of
+				 * the first SYN. */
+	__u32	undo_marker;	/* tracking retrans started here. */
+	int	undo_retrans;	/* number of undoable retransmissions. */
+	__u32	urg_seq;	/* Seq of received urgent pointer */
+	__u16	urg_data;	/* Saved octet of OOB data and control flags */
+	__u8	pending;	/* Scheduled timer event	*/
+	__u8	urg_mode;	/* In urgent mode		*/
+	__u32	snd_up;		/* Urgent pointer		*/
+
+	__u32	total_retrans;	/* Total retransmits for entire connection */
+
+	/* The syn_wait_lock is necessary only to avoid proc interface having
+	 * to grab the main lock sock while browsing the listening hash
+	 * (otherwise it's deadlock prone).
+	 * This lock is acquired in read mode only from listening_get_next()
+	 * and it's acquired in write mode _only_ from code that is actively
+	 * changing the syn_wait_queue. All readers that are holding
+	 * the master sock lock don't need to grab this lock in read mode
+	 * too as the syn_wait_queue writes are always protected from
+	 * the main sock lock.
+	 */
+	rwlock_t		syn_wait_lock;
+	struct tcp_listen_opt	*listen_opt;
+
+	/* FIFO of established children */
+	struct open_request	*accept_queue;
+	struct open_request	*accept_queue_tail;
+
+	unsigned int		keepalive_time;	  /* time before keep alive takes place */
+	unsigned int		keepalive_intvl;  /* time interval between keep alive probes */
+	int			linger2;
+
+	unsigned long last_synq_overflow; 
+
+/* Receiver side RTT estimation */
+	struct {
+		__u32	rtt;
+		__u32	seq;
+		__u32	time;
+	} rcv_rtt_est;
+
+/* Receiver queue space */
+	struct {
+		int	space;
+		__u32	seq;
+		__u32	time;
+	} rcvq_space;
+
+/* TCP Westwood structure */
+        struct {
+                __u32    bw_ns_est;        /* first bandwidth estimation..not too smoothed 8) */
+                __u32    bw_est;           /* bandwidth estimate */
+                __u32    rtt_win_sx;       /* here starts a new evaluation... */
+                __u32    bk;
+                __u32    snd_una;          /* used for evaluating the number of acked bytes */
+                __u32    cumul_ack;
+                __u32    accounted;
+                __u32    rtt;
+                __u32    rtt_min;          /* minimum observed RTT */
+        } westwood;
+
+/* Vegas variables */
+	struct {
+		__u32	beg_snd_nxt;	/* right edge during last RTT */
+		__u32	beg_snd_una;	/* left edge  during last RTT */
+		__u32	beg_snd_cwnd;	/* saves the size of the cwnd */
+		__u8	doing_vegas_now;/* if true, do vegas for this RTT */
+		__u16	cntRTT;		/* # of RTTs measured within last RTT */
+		__u32	minRTT;		/* min of RTTs measured within last RTT (in usec) */
+		__u32	baseRTT;	/* the min of all Vegas RTT measurements seen (in usec) */
+	} vegas;
+
+	/* BI TCP Parameters */
+	struct {
+		__u32	cnt;		/* increase cwnd by 1 after this number of ACKs */
+		__u32 	last_max_cwnd;	/* last maximium snd_cwnd */
+		__u32	last_cwnd;	/* the last snd_cwnd */
+		__u32   last_stamp;     /* time when updated last_cwnd */
+	} bictcp;
+};
+
+static inline struct tcp_sock *tcp_sk(const struct sock *sk)
+{
+	return (struct tcp_sock *)sk;
+}
+
+#endif
+
+#endif	/* _LINUX_TCP_H */