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/*
* Mausezahn - A fast versatile traffic generator
* Copyright (C) 2008-2010 Herbert Haas
*
* This program is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License version 2 as published by the
* Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, see http://www.gnu.org/licenses/gpl-2.0.html
*
*/
#include "mz.h"
#include "mops.h"
#include "cli.h"
// Calculates the number of TCP transmissions based on SQNR range
u_int32_t mops_tcp_complexity_sqnr (struct mops * mp)
{
u_int32_t a,b,t,result;
a = mp->tcp_seq_start;
b = mp->tcp_seq_stop;
t = mp->tcp_seq_delta;
if (!t) return 1; // delta set to zero means no range
if (a<b) // regular case
result = ceill ((b-a)/t);
else // range wraps around
result = ceill (((0xffffffff-a) + b)/t);
return result;
}
// Calculates the number of TCP transmissions based on SQNR range
u_int32_t mops_tcp_complexity_acknr (struct mops * mp)
{
u_int32_t a,b,t,result;
a = mp->tcp_ack_start;
b = mp->tcp_ack_stop;
t = mp->tcp_ack_delta;
if (!t) return 1; // delta set to zero means no range
if (a<b) // regular case
result = ceill ((b-a)/t);
else // range wraps around
result = ceill (((0xffffffff-a) + b)/t);
return result;
}
// *****TODO: TCP Options ******
// Remove all options
int mops_tcp_option_remove_all (struct mops* mp)
{
return 0;
}
// Prints current flag settings in the provided string 'str'.
// NOTE that str must be at least 32 bytes!
// *** BETTER USE 64 bytes (for future compatibility) ***
//
int mops_tcp_flags2str (struct mops* mp, char *str)
{
if (mp==NULL) {
sprintf(str, "(no valid mops)\n");
return 1;
}
sprintf(str, "%s-%s-%s-%s-%s-%s-%s-%s",
(mp->tcp_ctrl_CWR) ? "CRW" : "---",
(mp->tcp_ctrl_ECE) ? "ECE" : "---",
(mp->tcp_ctrl_URG) ? "URG" : "---",
(mp->tcp_ctrl_ACK) ? "ACK" : "---",
(mp->tcp_ctrl_PSH) ? "PSH" : "---",
(mp->tcp_ctrl_RST) ? "RST" : "---",
(mp->tcp_ctrl_SYN) ? "SYN" : "---",
(mp->tcp_ctrl_FIN) ? "FIN" : "---");
return 0;
}
// Add TCP options
//
// TODO: currently all params are ignored and a default option combination is added.
//
int mops_tcp_add_option (struct mops* mp,
int mss,
int sack,
int scale,
u_int32_t tsval,
u_int32_t tsecr)
{
u_int8_t tcp_default_options[] = {
0x02, 0x04, 0x05, 0xac, // MSS
0x04, 0x02, // SACK permitted
0x08, 0x0a, 0x19, 0x35, 0x90, 0xc3, 0x00, 0x00, 0x00, 0x00, // Timestamps
0x01, // NOP
0x03, 0x03, 0x05 // Window Scale 5
};
/* Kind: 8
Length: 10 bytes
+-------+-------+---------------------+---------------------+
|Kind=8 | 10 | TS Value (TSval) |TS Echo Reply (TSecr)|
+-------+-------+---------------------+---------------------+
1 1 4 4
*
* The Timestamps option carries two four-byte timestamp fields. The
* Timestamp Value field (TSval) contains the current value of the
* timestamp clock of the TCP sending the option.
*
* The Timestamp Echo Reply field (TSecr) is only valid if the ACK bit
* is set in the TCP header; if it is valid, it echos a times- tamp
* value that was sent by the remote TCP in the TSval field of a
* Timestamps option. When TSecr is not valid, its value must be zero.
* The TSecr value will generally be from the most recent Timestamp
* option that was received; however, there are exceptions that are
* explained below.
*
* A TCP may send the Timestamps option (TSopt) in an initial <SYN>
* segment (i.e., segment containing a SYN bit and no ACK bit), and
* may send a TSopt in other segments only if it re- ceived a TSopt in
* the initial <SYN> segment for the connection.
*
*/
memcpy((void*) mp->tcp_option, (void*) tcp_default_options, 20);
mp->tcp_option_s = 20;
mp->tcp_option_used = 1;
return 0;
}
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