From 5c306289b8a78a060a12eba5cd86e0efc3533da0 Mon Sep 17 00:00:00 2001
From: marc <marc>
Date: Mon, 20 Mar 2000 06:03:29 +0000
Subject: reorganized tree after kernel merge

---
 extensions/libipt_tos.c | 171 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 171 insertions(+)
 create mode 100644 extensions/libipt_tos.c

(limited to 'extensions/libipt_tos.c')

diff --git a/extensions/libipt_tos.c b/extensions/libipt_tos.c
new file mode 100644
index 0000000..eb62081
--- /dev/null
+++ b/extensions/libipt_tos.c
@@ -0,0 +1,171 @@
+/* Shared library add-on to iptables to add TOS matching support. */
+#include <stdio.h>
+#include <netdb.h>
+#include <string.h>
+#include <stdlib.h>
+#include <getopt.h>
+
+#include <iptables.h>
+#include <linux/netfilter_ipv4/ipt_tos.h>
+
+/* TOS names and values. */
+struct TOS_value
+{
+	unsigned char TOS;
+	const char *name;
+} TOS_values[] = {
+	{ IPTOS_LOWDELAY,    "Minimize-Delay" },
+	{ IPTOS_THROUGHPUT,  "Maximize-Throughput" },
+	{ IPTOS_RELIABILITY, "Maximize-Reliability" },
+	{ IPTOS_MINCOST,     "Minimize-Cost" },
+	{ IPTOS_NORMALSVC,   "Normal-Service" },
+};
+
+/* Function which prints out usage message. */
+static void
+help(void)
+{
+	unsigned int i;
+	
+	printf(
+"TOS match v%s options:\n"
+"[!] --tos value                 Match Type of Service field from one of the\n"
+"                                following numeric or descriptive values:\n",
+NETFILTER_VERSION);
+
+	for (i = 0; i < sizeof(TOS_values)/sizeof(struct TOS_value);i++)
+		printf("                                     %s %u (0x%02x)\n",
+		       TOS_values[i].name,
+                       TOS_values[i].TOS,
+                       TOS_values[i].TOS);
+	fputc('\n', stdout);
+}
+
+static struct option opts[] = {
+	{ "tos", 1, 0, '1' },
+	{0}
+};
+
+/* Initialize the match. */
+static void
+init(struct ipt_entry_match *m, unsigned int *nfcache)
+{
+	*nfcache |= NFC_IP_TOS;
+}
+
+static void
+parse_tos(const unsigned char *s, struct ipt_tos_info *info)
+{
+	unsigned int i;
+	int tos = string_to_number(s, 0, 255);
+
+	if (tos != -1) {
+		if (tos == IPTOS_LOWDELAY
+		    || tos == IPTOS_THROUGHPUT
+		    || tos == IPTOS_RELIABILITY
+		    || tos == IPTOS_MINCOST
+		    || tos == IPTOS_NORMALSVC) {
+		    	info->tos = (u_int8_t )tos;
+		    	return;
+		}
+	} else {
+		for (i = 0; i<sizeof(TOS_values)/sizeof(struct TOS_value); i++)
+			if (strcasecmp(s,TOS_values[i].name) == 0) {
+				info->tos = TOS_values[i].TOS;
+				return;
+			}
+	}
+	exit_error(PARAMETER_PROBLEM, "Bad TOS value `%s'", s);
+}
+
+/* Function which parses command options; returns true if it
+   ate an option */
+static int
+parse(int c, char **argv, int invert, unsigned int *flags,
+      const struct ipt_entry *entry,
+      unsigned int *nfcache,
+      struct ipt_entry_match **match)
+{
+	struct ipt_tos_info *tosinfo = (struct ipt_tos_info *)(*match)->data;
+
+	switch (c) {
+	case '1':
+		if (check_inverse(optarg, &invert))
+			optind++;
+		parse_tos(argv[optind-1], tosinfo);
+		if (invert)
+			tosinfo->invert = 1;
+		*flags = 1;
+		break;
+
+	default:
+		return 0;
+	}
+	return 1;
+}
+
+static void
+print_tos(u_int8_t tos, int invert, int numeric)
+{
+	unsigned int i;
+	
+	if (invert)
+		fputc('!', stdout);
+		
+	if (!numeric) {
+		for (i = 0; i<sizeof(TOS_values)/sizeof(struct TOS_value); i++)
+			if (TOS_values[i].TOS == tos) {
+				printf("%s ", TOS_values[i].name);
+				return;
+			}
+	}
+	printf("0x%02x ", tos);
+}
+
+/* Final check; must have specified --tos. */
+static void
+final_check(unsigned int flags)
+{
+	if (!flags)
+		exit_error(PARAMETER_PROBLEM,
+			   "TOS match: You must specify `--tos'");
+}
+
+/* Prints out the matchinfo. */
+static void
+print(const struct ipt_ip *ip,
+      const struct ipt_entry_match *match,
+      int numeric)
+{
+	printf("TOS match ");
+	print_tos(((struct ipt_tos_info *)match->data)->tos,
+		  ((struct ipt_tos_info *)match->data)->invert, numeric);
+}
+
+/* Saves the union ipt_matchinfo in parsable form to stdout. */
+static void
+save(const struct ipt_ip *ip, const struct ipt_entry_match *match)
+{
+	printf("--tos ");
+	print_tos(((struct ipt_tos_info *)match->data)->tos,
+		  ((struct ipt_tos_info *)match->data)->invert, 0);
+}
+
+struct iptables_match tos
+= { NULL,
+    "tos",
+    NETFILTER_VERSION,
+    sizeof(struct ipt_tos_info),
+    &help,
+    &init,
+    &parse,
+    &final_check,
+    &print,
+    &save,
+    opts
+};
+
+void _init(void)
+{
+	register_match(&tos);
+}
-- 
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