move DSCP name/value conversion to libipt_dscp_helper.c (Iain Barnes)

1 files changed, 82 insertions, 0 deletions

diff --git a/extensions/libipt_dscp_helper.c b/extensions/libipt_dscp_helper.c
new file mode 100644
index 00000000..742ac86a
--- /dev/null
+++ b/extensions/libipt_dscp_helper.c
@@ -0,0 +1,82 @@
+/*
+ * DiffServ classname <-> DiffServ codepoint mapping functions.
+ *
+ * The latest list of the mappings can be found at:
+ * <http://www.iana.org/assignments/dscp-registry>
+ *
+ * This code is released under the GNU GPL v2, 1991
+ * 
+ * Author: Iain Barnes
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <iptables_common.h>
+
+
+
+static struct ds_class
+{
+	const char *name;
+	unsigned int dscp;
+} ds_classes[] = 
+{
+	{ "CS0", 0x00 },
+	{ "CS1", 0x08 },
+	{ "CS2", 0x10 },
+	{ "CS3", 0x18 },
+	{ "CS4", 0x20 },
+	{ "CS5", 0x28 },
+	{ "CS6", 0x30 },
+	{ "CS7", 0x38 },
+	{ "BE", 0x00 },
+	{ "AF11", 0x0a },
+	{ "AF12", 0x0c },
+	{ "AF13", 0x0e },
+	{ "AF21", 0x12 },
+	{ "AF22", 0x14 },
+	{ "AF23", 0x16 },
+	{ "AF31", 0x1a },
+	{ "AF32", 0x1c },
+	{ "AF33", 0x1e },
+	{ "AF41", 0x22 },
+	{ "AF42", 0x24 },
+	{ "AF43", 0x26 },
+	{ "EF", 0x2e }
+};
+
+
+
+unsigned int 
+class_to_dscp(const char *name)
+{
+	int i;
+
+	for (i = 0; i < sizeof(ds_classes) / sizeof(struct ds_class); i++) {
+		if (!strncasecmp(name, ds_classes[i].name,
+					strlen(ds_classes[i].name))) 
+			return ds_classes[i].dscp;
+	}
+
+	exit_error(PARAMETER_PROBLEM, 
+			"Invalid DSCP value `%s'\n", name);
+}
+
+
+
+const char *
+dscp_to_name(unsigned int dscp)
+{
+	int i;
+
+	for (i = 0; i < sizeof(ds_classes) / sizeof(struct ds_class); i++) {
+		if (dscp == ds_classes[i].dscp)
+			return ds_classes[i].name;
+	}
+
+	
+	exit_error(PARAMETER_PROBLEM,
+			"Invalid DSCP value `%d'\n", dscp);
+}
+
+