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-rw-r--r--extensions/libipt_MARK.c120
1 files changed, 120 insertions, 0 deletions
diff --git a/extensions/libipt_MARK.c b/extensions/libipt_MARK.c
new file mode 100644
index 00000000..ef5a60d5
--- /dev/null
+++ b/extensions/libipt_MARK.c
@@ -0,0 +1,120 @@
+/* Shared library add-on to iptables to add MARK target support. */
+#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_MARK.h>
+
+struct markinfo {
+ struct ipt_entry_target t;
+ struct ipt_mark_target_info mark;
+};
+
+/* Function which prints out usage message. */
+static void
+help(void)
+{
+ printf(
+"MARK target v%s options:\n"
+" --set-mark value Set nfmark value\n"
+"\n",
+NETFILTER_VERSION);
+}
+
+static struct option opts[] = {
+ { "set-mark", 1, 0, '1' },
+ { 0 }
+};
+
+/* Initialize the target. */
+static void
+init(struct ipt_entry_target *t, unsigned int *nfcache)
+{
+}
+
+/* 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_mark_target_info *markinfo
+ = (struct ipt_mark_target_info *)(*target)->data;
+
+ switch (c) {
+ char *end;
+ case '1':
+ markinfo->mark = strtoul(optarg, &end, 0);
+ if (*end != '\0' || end == optarg)
+ exit_error(PARAMETER_PROBLEM, "Bad MARK value `%s'", optarg);
+ if (*flags)
+ exit_error(PARAMETER_PROBLEM,
+ "MARK target: Can't specify --set-mark twice");
+ *flags = 1;
+ break;
+
+ default:
+ return 0;
+ }
+
+ return 1;
+}
+
+static void
+final_check(unsigned int flags)
+{
+ if (!flags)
+ exit_error(PARAMETER_PROBLEM,
+ "MARK target: Parameter --set-mark is required");
+}
+
+static void
+print_mark(unsigned long mark, int numeric)
+{
+ printf("0x%lx ", mark);
+}
+
+/* Prints out the targinfo. */
+static void
+print(const struct ipt_ip *ip,
+ const struct ipt_entry_target *target,
+ int numeric)
+{
+ const struct ipt_mark_target_info *markinfo =
+ (const struct ipt_mark_target_info *)target->data;
+ printf("MARK set ");
+ print_mark(markinfo->mark, numeric);
+}
+
+/* Saves the union ipt_targinfo in parsable form to stdout. */
+static void
+save(const struct ipt_ip *ip, const struct ipt_entry_target *target)
+{
+ const struct ipt_mark_target_info *markinfo =
+ (const struct ipt_mark_target_info *)target->data;
+
+ printf("--set-mark 0x%lx ", markinfo->mark);
+}
+
+struct iptables_target mark
+= { NULL,
+ "MARK",
+ NETFILTER_VERSION,
+ sizeof(struct ipt_mark_target_info),
+ &help,
+ &init,
+ &parse,
+ &final_check,
+ &print,
+ &save,
+ opts
+};
+
+void _init(void)
+{
+ register_target(&mark);
+}