1*7c478bd9Sstevel@tonic-gate /* 2*7c478bd9Sstevel@tonic-gate * Copyright (C) 1993-2001 by Darren Reed. 3*7c478bd9Sstevel@tonic-gate * 4*7c478bd9Sstevel@tonic-gate * See the IPFILTER.LICENCE file for details on licencing. 5*7c478bd9Sstevel@tonic-gate * 6*7c478bd9Sstevel@tonic-gate * $Id: tcpflags.c,v 1.3 2002/11/02 07:18:01 darrenr Exp $ 7*7c478bd9Sstevel@tonic-gate */ 8*7c478bd9Sstevel@tonic-gate 9*7c478bd9Sstevel@tonic-gate #include "ipf.h" 10*7c478bd9Sstevel@tonic-gate 11*7c478bd9Sstevel@tonic-gate 12*7c478bd9Sstevel@tonic-gate /* 13*7c478bd9Sstevel@tonic-gate * ECN is a new addition to TCP - RFC 2481 14*7c478bd9Sstevel@tonic-gate */ 15*7c478bd9Sstevel@tonic-gate #ifndef TH_ECN 16*7c478bd9Sstevel@tonic-gate # define TH_ECN 0x40 17*7c478bd9Sstevel@tonic-gate #endif 18*7c478bd9Sstevel@tonic-gate #ifndef TH_CWR 19*7c478bd9Sstevel@tonic-gate # define TH_CWR 0x80 20*7c478bd9Sstevel@tonic-gate #endif 21*7c478bd9Sstevel@tonic-gate 22*7c478bd9Sstevel@tonic-gate extern char flagset[]; 23*7c478bd9Sstevel@tonic-gate extern u_char flags[]; 24*7c478bd9Sstevel@tonic-gate 25*7c478bd9Sstevel@tonic-gate tcpflags(flgs)26*7c478bd9Sstevel@tonic-gateu_char tcpflags(flgs) 27*7c478bd9Sstevel@tonic-gate char *flgs; 28*7c478bd9Sstevel@tonic-gate { 29*7c478bd9Sstevel@tonic-gate u_char tcpf = 0; 30*7c478bd9Sstevel@tonic-gate char *s, *t; 31*7c478bd9Sstevel@tonic-gate 32*7c478bd9Sstevel@tonic-gate for (s = flgs; *s; s++) { 33*7c478bd9Sstevel@tonic-gate if (*s == 'W') 34*7c478bd9Sstevel@tonic-gate tcpf |= TH_CWR; 35*7c478bd9Sstevel@tonic-gate else { 36*7c478bd9Sstevel@tonic-gate if (!(t = strchr(flagset, *s))) { 37*7c478bd9Sstevel@tonic-gate return 0; 38*7c478bd9Sstevel@tonic-gate } 39*7c478bd9Sstevel@tonic-gate tcpf |= flags[t - flagset]; 40*7c478bd9Sstevel@tonic-gate } 41*7c478bd9Sstevel@tonic-gate } 42*7c478bd9Sstevel@tonic-gate return tcpf; 43*7c478bd9Sstevel@tonic-gate } 44