added shlib plugin for ipv6 mark match

diff --git a/extensions/libip6t_mark.c b/extensions/libip6t_mark.c
new file mode 100644 (file)
index 0000000..e4ed932
--- /dev/null
+++ b/extensions/libip6t_mark.c
@@ -0,0 +1,129 @@
+/* Shared library add-on to ip6tables to add NFMARK matching support. */
+#include <stdio.h>
+#include <netdb.h>
+#include <string.h>
+#include <stdlib.h>
+#include <getopt.h>
+
+#include <ip6tables.h>
+#include <linux/netfilter_ipv6/ip6t_mark.h>
+
+/* Function which prints out usage message. */
+static void
+help(void)
+{
+       printf(
+"MARK match v%s options:\n"
+"[!] --mark value[/mask]         Match nfmark value with optional mask\n"
+"\n",
+NETFILTER_VERSION);
+}
+
+static struct option opts[] = {
+       { "mark", 1, 0, '1' },
+       {0}
+};
+
+/* Initialize the match. */
+static void
+init(struct ip6t_entry_match *m, unsigned int *nfcache)
+{
+       /* Can't cache this. */
+       *nfcache |= NFC_UNKNOWN;
+}
+
+/* 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 ip6t_entry *entry,
+      unsigned int *nfcache,
+      struct ip6t_entry_match **match)
+{
+       struct ip6t_mark_info *markinfo = (struct ip6t_mark_info *)(*match)->data;
+
+       switch (c) {
+               char *end;
+       case '1':
+               if (check_inverse(optarg, &invert))
+                       optind++;
+               markinfo->mark = strtoul(optarg, &end, 0);
+               if (*end == '/') {
+                       markinfo->mask = strtoul(end+1, &end, 0);
+               } else
+                       markinfo->mask = 0xffffffff;
+               if (*end != '\0' || end == optarg)
+                       exit_error(PARAMETER_PROBLEM, "Bad MARK value `%s'", optarg);
+               if (invert)
+                       markinfo->invert = 1;
+               *flags = 1;
+               break;
+
+       default:
+               return 0;
+       }
+       return 1;
+}
+
+static void
+print_mark(unsigned long mark, unsigned long mask, int invert, int numeric)
+{
+       if (invert)
+               fputc('!', stdout);
+
+       if(mask != 0xffffffff)
+               printf("0x%lx/0x%lx ", mark, mask);
+       else
+               printf("0x%lx ", mark);
+}
+
+/* Final check; must have specified --mark. */
+static void
+final_check(unsigned int flags)
+{
+       if (!flags)
+               exit_error(PARAMETER_PROBLEM,
+                          "MARK match: You must specify `--mark'");
+}
+
+/* Prints out the matchinfo. */
+static void
+print(const struct ip6t_ip6 *ip,
+      const struct ip6t_entry_match *match,
+      int numeric)
+{
+       printf("MARK match ");
+       print_mark(((struct ip6t_mark_info *)match->data)->mark,
+                 ((struct ip6t_mark_info *)match->data)->mask,
+                 ((struct ip6t_mark_info *)match->data)->invert, numeric);
+}
+
+/* Saves the union ip6t_matchinfo in parsable form to stdout. */
+static void
+save(const struct ip6t_ip6 *ip, const struct ip6t_entry_match *match)
+{
+       printf("--mark ");
+       print_mark(((struct ip6t_mark_info *)match->data)->mark,
+                 ((struct ip6t_mark_info *)match->data)->mask,
+                 ((struct ip6t_mark_info *)match->data)->invert, 0);
+}
+
+struct ip6tables_match mark
+= { NULL,
+    "mark",
+    NETFILTER_VERSION,
+    IP6T_ALIGN(sizeof(struct ip6t_mark_info)),
+    IP6T_ALIGN(sizeof(struct ip6t_mark_info)),
+    &help,
+    &init,
+    &parse,
+    &final_check,
+    &print,
+    &save,
+    opts
+};
+
+void _init(void)
+{
+       register_match6(&mark);
+}