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43 lines
575 B
C
43 lines
575 B
C
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/*
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* Copyright (C) 2012 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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* $Id$
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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(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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