46 lines
699 B
C
46 lines
699 B
C
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/* $NetBSD: tcpflags.c,v 1.1.1.1 2004/03/28 08:56:21 martti Exp $ */
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/*
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* Copyright (C) 1993-2001 by Darren Reed.
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*
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* See the IPFILTER.LICENCE file for details on licencing.
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*
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* Id: tcpflags.c,v 1.3 2002/11/02 07:18:01 darrenr Exp
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*/
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#include "ipf.h"
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/*
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* ECN is a new addition to TCP - RFC 2481
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*/
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#ifndef TH_ECN
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# define TH_ECN 0x40
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#endif
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#ifndef TH_CWR
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# define TH_CWR 0x80
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#endif
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extern char flagset[];
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extern u_char flags[];
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u_char tcpflags(flgs)
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char *flgs;
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{
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u_char tcpf = 0;
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char *s, *t;
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for (s = flgs; *s; s++) {
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if (*s == 'W')
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tcpf |= TH_CWR;
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else {
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if (!(t = strchr(flagset, *s))) {
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return 0;
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}
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tcpf |= flags[t - flagset];
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}
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}
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return tcpf;
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}
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