/*
 * Copyright (C) 2012 by Darren Reed.
 *
 * See the IPFILTER.LICENCE file for details on licencing.
 *
 * $Id$
 */

#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
#ifndef TH_AE
# define        TH_AE  0x100
#endif

extern  char     flagset[];
extern  uint16_t flags[];


uint16_t tcpflags(char *flgs)
{
        uint16_t 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);
}