1/* $FreeBSD: head/contrib/ipfilter/lib/tcpflags.c 145519 2005-04-25 18:20:15Z darrenr $ */
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1/* $FreeBSD: head/contrib/ipfilter/lib/tcpflags.c 153881 2005-12-30 11:52:26Z guido $ */ |
2 3/* 4 * Copyright (C) 1993-2001 by Darren Reed. 5 * 6 * See the IPFILTER.LICENCE file for details on licencing. 7 *
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8 * Id: tcpflags.c,v 1.3 2002/11/02 07:18:01 darrenr Exp
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8 * $Id: tcpflags.c,v 1.3 2002/11/02 07:18:01 darrenr Exp $ |
9 */ 10 11#include "ipf.h" 12 13 14/* 15 * ECN is a new addition to TCP - RFC 2481 16 */ 17#ifndef TH_ECN 18# define TH_ECN 0x40 19#endif 20#ifndef TH_CWR 21# define TH_CWR 0x80 22#endif 23 24extern char flagset[]; 25extern u_char flags[]; 26 27 28u_char tcpflags(flgs) 29char *flgs; 30{ 31 u_char tcpf = 0; 32 char *s, *t; 33 34 for (s = flgs; *s; s++) { 35 if (*s == 'W') 36 tcpf |= TH_CWR; 37 else { 38 if (!(t = strchr(flagset, *s))) { 39 return 0; 40 } 41 tcpf |= flags[t - flagset]; 42 } 43 } 44 return tcpf; 45}
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