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/* $FreeBSD$ */
/*
* Copyright (C) 1993-2001 by Darren Reed.
*
* See the IPFILTER.LICENCE file for details on licencing.
*
* Id: tcpflags.c,v 1.3 2002/11/02 07:18:01 darrenr Exp
*/
#include "ipf.h"
/*
* ECN is a new addition to TCP - RFC 2481
*/
#ifndef TH_ECN
# define TH_ECN 0x40
#endif
#ifndef TH_CWR
# define TH_CWR 0x80
#endif
extern char flagset[];
extern u_char flags[];
u_char tcpflags(flgs)
char *flgs;
{
u_char tcpf = 0;
char *s, *t;
for (s = flgs; *s; s++) {
if (*s == 'W')
tcpf |= TH_CWR;
else {
if (!(t = strchr(flagset, *s))) {
return 0;
}
tcpf |= flags[t - flagset];
}
}
return tcpf;
}
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