add ROUTE target / rsip table

2 files changed, 144 insertions, 0 deletions

diff --git a/extensions/.ROUTE-test b/extensions/.ROUTE-test
new file mode 100755
index 00000000..8b7b3f07
--- /dev/null
+++ b/extensions/.ROUTE-test
@@ -0,0 +1,2 @@
+#! /bin/sh
+[ -f $KERNEL_DIR/net/ipv4/netfilter/ipt_ROUTE.c ] && echo ROUTE
diff --git a/extensions/libipt_ROUTE.c b/extensions/libipt_ROUTE.c
new file mode 100644
index 00000000..1229c7ad
--- /dev/null
+++ b/extensions/libipt_ROUTE.c
@@ -0,0 +1,142 @@
+/* Shared library add-on to iptables to add ROUTE target support.
+ * Author : Cédric de Launois, <delaunois@info.ucl.ac.be>
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <getopt.h>
+
+#include <iptables.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ipt_ROUTE.h>
+#include <net/if.h>
+
+/* Function which prints out usage message. */
+static void
+help(void)
+{
+	printf(
+"ROUTE target v%s options:\n"
+"  --iface   name                Send this packet directly through iface name.\n"
+"  --ifindex index               Send this packet directly through iface index.\n"
+"\n",
+NETFILTER_VERSION);
+}
+
+static struct option opts[] = {
+	{ "iface", 1, 0, '1' },
+	{ "ifindex", 1, 0, '2' },
+	{ 0 }
+};
+
+/* Initialize the target. */
+static void
+init(struct ipt_entry_target *t, unsigned int *nfcache)
+{
+}
+
+#define IPT_ROUTE_OPT_IF    0x01
+
+/* 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,
+      struct ipt_entry_target **target)
+{
+	struct ipt_route_target_info *route_info = 
+		(struct ipt_route_target_info*)(*target)->data;
+
+	unsigned int if_index;
+
+	switch (c) {
+		char *end;
+	case '1':
+		if (*flags & IPT_ROUTE_OPT_IF)
+			exit_error(PARAMETER_PROBLEM,
+				   "Can't specify --iface or --ifindex twice");
+
+		if (check_inverse(optarg, &invert))
+			exit_error(PARAMETER_PROBLEM,
+				   "Unexpected `!' after --iface");
+
+		if ((if_index = if_nametoindex(optarg))==0)
+			exit_error(PARAMETER_PROBLEM,
+				   "Unknown interface name %s", optarg);
+
+		route_info->if_index = if_index;
+		*flags |= IPT_ROUTE_OPT_IF;
+		break;
+
+	case '2':
+		if (*flags & IPT_ROUTE_OPT_IF)
+			exit_error(PARAMETER_PROBLEM,
+				   "Can't specify --iface or --ifindex twice");
+
+		if (check_inverse(optarg, &invert))
+			exit_error(PARAMETER_PROBLEM,
+				   "Unexpected `!' after --ifindex");
+
+		route_info->if_index = strtoul(optarg, &end, 0);
+
+		if (*end != '\0' || end == optarg)
+			exit_error(PARAMETER_PROBLEM, "Bad ROUTE ifindex `%s'", optarg);
+
+		*flags |= IPT_ROUTE_OPT_IF;
+		break;
+
+	default:
+		return 0;
+	}
+
+	return 1;
+}
+
+static void
+final_check(unsigned int flags)
+{
+	if (!flags)
+		exit_error(PARAMETER_PROBLEM,
+		           "ROUTE target: Parameter --iface is required");
+}
+
+/* Prints out the targinfo. */
+static void
+print(const struct ipt_ip *ip,
+      const struct ipt_entry_target *target,
+      int numeric)
+{
+	const struct ipt_route_target_info *route_info
+		= (const struct ipt_route_target_info *)target->data;
+
+	printf("ROUTE ");
+
+	if (route_info->if_index != 0) {
+		char buf[IF_NAMESIZE];
+		printf("iface %s(%d) ",
+		       if_indextoname(route_info->if_index, buf),
+		       route_info->if_index);
+	}
+}
+
+static
+struct iptables_target route
+= { NULL,
+    "ROUTE",
+    NETFILTER_VERSION,
+    IPT_ALIGN(sizeof(struct ipt_route_target_info)),
+    IPT_ALIGN(sizeof(struct ipt_route_target_info)),
+    &help,
+    &init,
+    &parse,
+    &final_check,
+    &print,
+    NULL, /* save */
+    opts
+};
+
+void _init(void)
+{
+	register_target(&route);
+}