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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 | /* * 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 + 15 #define MAX_FIN_SIZE 40 + MAX_HEADER + 15 #define MAX_ACK_SIZE 40 + MAX_HEADER + 15 #define MAX_RESET_SIZE 40 + MAX_HEADER + 15 #define MAX_WINDOW 32767 /* Never offer a window over 32767 without using window scaling (not yet supported). Some poor stacks do signed 16bit maths! */ #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 10 /* number of times to retry opening a * connection (TCP_RETR2-....) */ #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(__u32 seq1, __u32 seq2) { return (__s32)(seq1-seq2) < 0; } extern __inline int after(__u32 seq1, __u32 seq2) { return (__s32)(seq1-seq2) > 0; } /* is s2<=s1<=s3 ? */ extern __inline int between(__u32 seq1, __u32 seq2, __u32 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 type, int code, unsigned char *header, __u32 daddr, __u32, 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, __u32 daddr, unsigned short len, __u32 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 *); extern void tcp_cache_zap(void); #endif /* _TCP_H */ |