From e6869a8f59d779ff4d5a0984c86d80db70784962 Mon Sep 17 00:00:00 2001
From: Marc Boucher <marc@mbsi.ca>
Date: Mon, 20 Mar 2000 06:03:29 +0000
Subject: reorganized tree after kernel merge

---
 extensions/libipt_mac.c | 144 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 144 insertions(+)
 create mode 100644 extensions/libipt_mac.c

(limited to 'extensions/libipt_mac.c')

diff --git a/extensions/libipt_mac.c b/extensions/libipt_mac.c
new file mode 100644
index 00000000..36d89692
--- /dev/null
+++ b/extensions/libipt_mac.c
@@ -0,0 +1,144 @@
+/* Shared library add-on to iptables to add MAC address support. */
+#include <stdio.h>
+#include <netdb.h>
+#include <string.h>
+#include <stdlib.h>
+#include <getopt.h>
+#if defined(__GLIBC__) && __GLIBC__ == 2
+#include <net/ethernet.h>
+#else
+#include <linux/if_ether.h>
+#endif
+#include <iptables.h>
+#include <linux/netfilter_ipv4/ipt_mac.h>
+
+/* Function which prints out usage message. */
+static void
+help(void)
+{
+	printf(
+"MAC v%s options:\n"
+" --mac-source [!] XX:XX:XX:XX:XX:XX\n"
+"				Match source MAC address\n"
+"\n", NETFILTER_VERSION);
+}
+
+static struct option opts[] = {
+	{ "mac-source", 1, 0, '1' },
+	{0}
+};
+
+/* Initialize the match. */
+static void
+init(struct ipt_entry_match *m, unsigned int *nfcache)
+{
+	/* Can't cache this */
+	*nfcache |= NFC_UNKNOWN;
+}
+
+static void
+parse_mac(const char *mac, struct ipt_mac_info *info)
+{
+	unsigned int i = 0;
+
+	if (strlen(mac) != ETH_ALEN*3-1)
+		exit_error(PARAMETER_PROBLEM, "Bad mac address `%s'", mac);
+
+	for (i = 0; i < ETH_ALEN; i++) {
+		long number;
+		char *end;
+
+		number = strtol(mac + i*3, &end, 16);
+
+		if (end == mac + i*3 + 2
+		    && number >= 0
+		    && number <= 255)
+			info->srcaddr[i] = number;
+		else
+			exit_error(PARAMETER_PROBLEM,
+				   "Bad mac address `%s'", mac);
+	}
+}
+
+/* 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_mac_info *macinfo = (struct ipt_mac_info *)(*match)->data;
+
+	switch (c) {
+	case '1':
+		if (check_inverse(optarg, &invert))
+			optind++;
+		parse_mac(argv[optind-1], macinfo);
+		if (invert)
+			macinfo->invert = 1;
+		*flags = 1;
+		break;
+
+	default:
+		return 0;
+	}
+
+	return 1;
+}
+
+static void print_mac(unsigned char macaddress[ETH_ALEN], int invert)
+{
+	unsigned int i;
+
+	printf("%s%02X", invert ? "!" : "", macaddress[0]);
+	for (i = 1; i < ETH_ALEN; i++)
+		printf(":%02X", macaddress[i]);
+	printf(" ");
+}
+
+/* Final check; must have specified --mac. */
+static void final_check(unsigned int flags)
+{
+	if (!flags)
+		exit_error(PARAMETER_PROBLEM,
+			   "You must specify `--mac-source'");
+}
+
+/* Prints out the matchinfo. */
+static void
+print(const struct ipt_ip *ip,
+      const struct ipt_entry_match *match,
+      int numeric)
+{
+	printf("MAC ");
+	print_mac(((struct ipt_mac_info *)match->data)->srcaddr,
+		  ((struct ipt_mac_info *)match->data)->invert);
+}
+
+/* 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("--mac ");
+	print_mac(((struct ipt_mac_info *)match->data)->srcaddr,
+		  ((struct ipt_mac_info *)match->data)->invert);
+}
+
+struct iptables_match mac
+= { NULL,
+    "mac",
+    NETFILTER_VERSION,
+    sizeof(struct ipt_mac_info),
+    &help,
+    &init,
+    &parse,
+    &final_check,
+    &print,
+    &save,
+    opts
+};
+
+void _init(void)
+{
+	register_match(&mac);
+}
-- 
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