1 /* $NetBSD: tcpflags.c,v 1.2 2012/07/22 14:27:37 darrenr Exp $ */ 2 3 /* 4 * Copyright (C) 2012 by Darren Reed. 5 * 6 * See the IPFILTER.LICENCE file for details on licencing. 7 * 8 * Id: tcpflags.c,v 1.1.1.2 2012/07/22 13:44:43 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 24 extern char flagset[]; 25 extern u_char flags[]; 26 27 tcpflags(flgs)28u_char tcpflags(flgs) 29 char *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 } 46