132 lines
3.9 KiB
C
132 lines
3.9 KiB
C
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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 module.
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*
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* Version: @(#)tcp.h 1.0.5 05/23/93
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*
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* Authors: Ross Biro, <bir7@leland.Stanford.Edu>
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* 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 _TCP_H
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#define _TCP_H
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#include <linux/tcp.h>
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#define MAX_SYN_SIZE 44 + sizeof (struct sk_buff) + MAX_HEADER
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#define MAX_FIN_SIZE 40 + sizeof (struct sk_buff) + MAX_HEADER
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#define MAX_ACK_SIZE 40 + sizeof (struct sk_buff) + MAX_HEADER
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#define MAX_RESET_SIZE 40 + sizeof (struct sk_buff) + MAX_HEADER
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#define MAX_WINDOW 4096
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#define MIN_WINDOW 2048
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#define MAX_ACK_BACKLOG 2
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#define MIN_WRITE_SPACE 2048
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#define TCP_WINDOW_DIFF 2048
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#define TCP_RETR1 7 /*
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* This is howmany retries it does before it
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* tries to figure out if the gateway is
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* down.
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*/
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#define TCP_RETR2 15 /*
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* This should take at least
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* 90 minutes to time out.
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*/
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#define TCP_TIMEOUT_LEN (15*60*HZ) /* should be about 15 mins */
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#define TCP_TIMEWAIT_LEN (60*HZ) /* how long to wait to sucessfully
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* close the socket, about 60 seconds */
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#define TCP_ACK_TIME 3000 /* time to delay before sending an ACK */
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#define TCP_DONE_TIME 250 /* maximum time to wait before actually
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* destroying a socket */
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#define TCP_WRITE_TIME 3000 /* initial time to wait for an ACK,
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* after last transmit */
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#define TCP_CONNECT_TIME 2000 /* time to retransmit first SYN */
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#define TCP_SYN_RETRIES 5 /* number of times to retry openning a
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* connection */
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#define TCP_PROBEWAIT_LEN 100 /* time to wait between probes when
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* I've got something to write and
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* there is no window */
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#define TCP_NO_CHECK 0 /* turn to one if you want the default
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* to be no checksum */
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#define TCP_WRITE_QUEUE_MAGIC 0xa5f23477
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/*
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* TCP option
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*/
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#define TCPOPT_NOP 1
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#define TCPOPT_EOL 0
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#define TCPOPT_MSS 2
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/*
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* The next routines deal with comparing 32 bit unsigned ints
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* and worry about wraparound (automatic with unsigned arithmetic).
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*/
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static inline int before(unsigned long seq1, unsigned long seq2)
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{
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/* this inequality is strict. */
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if (seq1 == seq2)
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return 0;
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seq2 -= seq1;
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return (seq2 < 65536);
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}
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static inline int after(unsigned long seq1, unsigned long seq2)
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{
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return before(seq2, seq1);
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}
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/* is s2<=s1<=s3 ? */
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static inline int between(unsigned long seq1, unsigned long seq2, unsigned long seq3)
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{
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return (after(seq1+1, seq2) && before(seq1, seq3+1));
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}
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/*
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* List all states of a TCP socket that can be viewed as a "connected"
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* state. This now includes TCP_SYN_RECV, although I am not yet fully
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* convinced that this is the solution for the 'getpeername(2)'
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* problem. Thanks to Stephen A. Wood <saw@cebaf.gov> -FvK
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*/
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static inline const int
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tcp_connected(const int state)
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{
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return(state == TCP_ESTABLISHED || state == TCP_CLOSE_WAIT ||
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state == TCP_FIN_WAIT1 || state == TCP_FIN_WAIT2 ||
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state == TCP_SYN_RECV);
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}
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extern struct proto tcp_prot;
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extern void print_th(struct tcphdr *);
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extern void tcp_err(int err, unsigned char *header, unsigned long daddr,
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unsigned long saddr, struct inet_protocol *protocol);
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extern void tcp_shutdown (struct sock *sk, int how);
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extern int tcp_rcv(struct sk_buff *skb, struct device *dev,
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struct options *opt, unsigned long daddr,
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unsigned short len, unsigned long saddr, int redo,
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struct inet_protocol *protocol);
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extern int tcp_ioctl(struct sock *sk, int cmd, unsigned long arg);
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extern void tcp_enqueue_partial(struct sk_buff *, struct sock *);
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extern struct sk_buff * tcp_dequeue_partial(struct sock *);
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#endif /* _TCP_H */
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