1 files changed, 43 insertions, 0 deletions
diff --git a/lib/tcpflags.c b/lib/tcpflags.c
new file mode 100644
index 0000000..bf2c284
--- /dev/null
+++ b/lib/tcpflags.c
@@ -0,0 +1,43 @@
+/*
+ * Copyright (C) 2001-2002 by Darren Reed.
+ *
+ * See the IPFILTER.LICENCE file for details on licencing.
+ *
+ * $Id: tcpflags.c,v 1.3.4.1 2006/06/16 17:21:17 darrenr Exp $
+ */
+
+#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
+
+extern	char	flagset[];
+extern	u_char	flags[];
+
+
+u_char tcpflags(flgs)
+char *flgs;
+{
+	u_char 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;
+}