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authorlaforge <laforge>2002-06-13 16:12:01 +0000
committerlaforge <laforge>2002-06-13 16:12:01 +0000
commit0a3bfc04059327e1fa213ed63bdb7b98e6c2d3b1 (patch)
treea3c545054c00a3532402c30423f6459876ce6d57 /extensions/libipt_ROUTE.c
parentdc4d8bb52af1d14f90afdb937d2601fd38adb080 (diff)
add ROUTE target / rsip table
Diffstat (limited to 'extensions/libipt_ROUTE.c')
-rw-r--r--extensions/libipt_ROUTE.c142
1 files changed, 142 insertions, 0 deletions
diff --git a/extensions/libipt_ROUTE.c b/extensions/libipt_ROUTE.c
new file mode 100644
index 0000000..1229c7a
--- /dev/null
+++ b/extensions/libipt_ROUTE.c
@@ -0,0 +1,142 @@
+/* Shared library add-on to iptables to add ROUTE target support.
+ * Author : CÚdric 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);
+}