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/*
* 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 module.
*
* Version: @(#)tcp.h 1.0.5 05/23/93
*
* Authors: Ross Biro, <bir7@leland.Stanford.Edu>
* 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 _TCP_H
#define _TCP_H
#include <linux/tcp.h>
#define MAX_SYN_SIZE 44 + MAX_HEADER
#define MAX_FIN_SIZE 40 + MAX_HEADER
#define MAX_ACK_SIZE 40 + MAX_HEADER
#define MAX_RESET_SIZE 40 + MAX_HEADER
#define MAX_WINDOW 16384
#define MIN_WINDOW 2048
#define MAX_ACK_BACKLOG 2
#define MIN_WRITE_SPACE 2048
#define TCP_WINDOW_DIFF 2048
/* urg_data states */
#define URG_VALID 0x0100
#define URG_NOTYET 0x0200
#define URG_READ 0x0400
#define TCP_RETR1 7 /*
* This is how many retries it does before it
* tries to figure out if the gateway is
* down.
*/
#define TCP_RETR2 15 /*
* This should take at least
* 90 minutes to time out.
*/
#define TCP_TIMEOUT_LEN (15*60*HZ) /* should be about 15 mins */
#define TCP_TIMEWAIT_LEN (60*HZ) /* how long to wait to successfully
* close the socket, about 60 seconds */
#define TCP_FIN_TIMEOUT (3*60*HZ) /* BSD style FIN_WAIT2 deadlock breaker */
#define TCP_ACK_TIME (3*HZ) /* time to delay before sending an ACK */
#define TCP_DONE_TIME 250 /* maximum time to wait before actually
* destroying a socket */
#define TCP_WRITE_TIME 3000 /* initial time to wait for an ACK,
* after last transmit */
#define TCP_TIMEOUT_INIT (3*HZ) /* RFC 1122 initial timeout value */
#define TCP_SYN_RETRIES 5 /* number of times to retry opening a
* connection */
#define TCP_PROBEWAIT_LEN 100 /* time to wait between probes when
* I've got something to write and
* there is no window */
#define TCP_NO_CHECK 0 /* turn to one if you want the default
* to be no checksum */
/*
* TCP option
*/
#define TCPOPT_NOP 1 /* Padding */
#define TCPOPT_EOL 0 /* End of options */
#define TCPOPT_MSS 2 /* Segment size negotiating */
/*
* We don't use these yet, but they are for PAWS and big windows
*/
#define TCPOPT_WINDOW 3 /* Window scaling */
#define TCPOPT_TIMESTAMP 8 /* Better RTT estimations/PAWS */
/*
* The next routines deal with comparing 32 bit unsigned ints
* and worry about wraparound (automatic with unsigned arithmetic).
*/
extern __inline int before(unsigned long seq1, unsigned long seq2)
{
return (long)(seq1-seq2) < 0;
}
extern __inline int after(unsigned long seq1, unsigned long seq2)
{
return (long)(seq1-seq2) > 0;
}
/* is s2<=s1<=s3 ? */
extern __inline int between(unsigned long seq1, unsigned long seq2, unsigned long seq3)
{
return (after(seq1+1, seq2) && before(seq1, seq3+1));
}
/*
* List all states of a TCP socket that can be viewed as a "connected"
* state. This now includes TCP_SYN_RECV, although I am not yet fully
* convinced that this is the solution for the 'getpeername(2)'
* problem. Thanks to Stephen A. Wood <saw@cebaf.gov> -FvK
*/
extern __inline const int
tcp_connected(const int state)
{
return(state == TCP_ESTABLISHED || state == TCP_CLOSE_WAIT ||
state == TCP_FIN_WAIT1 || state == TCP_FIN_WAIT2 ||
state == TCP_SYN_RECV);
}
extern struct proto tcp_prot;
extern void tcp_err(int err, unsigned char *header, unsigned long daddr,
unsigned long saddr, struct inet_protocol *protocol);
extern void tcp_shutdown (struct sock *sk, int how);
extern int tcp_rcv(struct sk_buff *skb, struct device *dev,
struct options *opt, unsigned long daddr,
unsigned short len, unsigned long saddr, int redo,
struct inet_protocol *protocol);
extern int tcp_ioctl(struct sock *sk, int cmd, unsigned long arg);
extern int tcp_select_window(struct sock *sk);
extern void tcp_send_check(struct tcphdr *th, unsigned long saddr,
unsigned long daddr, int len, struct sock *sk);
extern void tcp_send_probe0(struct sock *sk);
extern void tcp_enqueue_partial(struct sk_buff *, struct sock *);
extern struct sk_buff * tcp_dequeue_partial(struct sock *);
#endif /* _TCP_H */
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