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-rw-r--r--extensions/libipt_set.c152
1 files changed, 152 insertions, 0 deletions
diff --git a/extensions/libipt_set.c b/extensions/libipt_set.c
new file mode 100644
index 00000000..06691f35
--- /dev/null
+++ b/extensions/libipt_set.c
@@ -0,0 +1,152 @@
+/* Shared library add-on to iptables to add IP address set matching. */
+#include <stdio.h>
+#include <netdb.h>
+#include <string.h>
+#include <stdlib.h>
+#include <getopt.h>
+#include <ctype.h>
+#include <errno.h>
+
+#include <iptables.h>
+#include <linux/netfilter_ipv4/ip_conntrack.h>
+#include <linux/netfilter_ipv4/ipt_set.h>
+#include "../ipset/libipt_set.h"
+
+/* Function which prints out usage message. */
+static void help(void)
+{
+ printf("set v%s options:\n"
+ " [!] --set name[:flags] flags\n"
+ " 'name' is the set name from to match.\n"
+ " 'flags' are the comma separated list of\n"
+ " 'src' and 'dst'.\n"
+ "\n", IPTABLES_VERSION);
+}
+
+static struct option opts[] = {
+ {"set", 1, 0, '1'},
+ {0}
+};
+
+/* Initialize the match. */
+static void init(struct ipt_entry_match *match, unsigned int *nfcache)
+{
+ struct ipt_set_info_match *info =
+ (struct ipt_set_info_match *) match->data;
+
+
+ memset(info, 0, sizeof(struct ipt_set_info_match));
+ info->match.id = -1;
+
+ /* Can't cache this - XXX */
+ *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 ipt_entry *entry,
+ unsigned int *nfcache, struct ipt_entry_match **match)
+{
+ struct ipt_set_info_match *myinfo =
+ (struct ipt_set_info_match *) (*match)->data;
+ struct ipt_set_info *info = &myinfo->match;
+
+ switch (c) {
+ case '1': /* --set <set>[:<flags>] <flags> */
+ check_inverse(optarg, &invert, &optind, 0);
+ if (invert)
+ info->flags[0] |= IPSET_MATCH_INV;
+
+ if (!argv[optind]
+ || argv[optind][0] == '-' || argv[optind][0] == '!')
+ exit_error(PARAMETER_PROBLEM,
+ "--set requires two args.");
+
+ parse_pool(argv[optind - 1], info);
+ if (parse_ipflags(argv[optind++], info))
+ exit_error(PARAMETER_PROBLEM,
+ "Can't use overwrite flag with --set.");
+
+ *flags = 1;
+ break;
+
+ default:
+ return 0;
+ }
+
+ return 1;
+}
+
+/* Final check; must have specified --set. */
+static void final_check(unsigned int flags)
+{
+ if (!flags)
+ exit_error(PARAMETER_PROBLEM,
+ "You must specify either `--set'");
+}
+
+static void
+print_match(const char *prefix, const struct ipt_set_info *info)
+{
+ int i;
+ char setname[IP_SET_MAXNAMELEN];
+
+ if (info->id >= 0) {
+ get_set_byid(setname, info->id);
+ printf("%s%s %s",
+ (info->flags[0] & IPSET_MATCH_INV) ? "!" : "",
+ prefix,
+ setname);
+ for (i = 0; i < info->set_level; i++)
+ printf("%s%s",
+ i == 0 ? ":" : ",",
+ info->flags[i] & IPSET_SRC ? "src" : "dst");
+ for (i = info->set_level; i < info->ip_level; i++)
+ printf("%s%s",
+ i == info->set_level ? " " : ",",
+ info->flags[i] & IPSET_SRC ? "src" : "dst");
+ printf(" ");
+ }
+}
+
+/* Prints out the matchinfo. */
+static void
+print(const struct ipt_ip *ip,
+ const struct ipt_entry_match *match, int numeric)
+{
+ struct ipt_set_info_match *info =
+ (struct ipt_set_info_match *) match->data;
+
+ print_match("set", &info->match);
+}
+
+/* Saves the matchinfo in parsable form to stdout. */
+static void save(const struct ipt_ip *ip,
+ const struct ipt_entry_match *match)
+{
+ struct ipt_set_info_match *info =
+ (struct ipt_set_info_match *) match->data;
+
+ print_match("--set", &info->match);
+}
+
+static
+struct iptables_match set = { NULL,
+ .name = "set",
+ .version = IPTABLES_VERSION,
+ .size = IPT_ALIGN(sizeof(struct ipt_set_info_match)),
+ .userspacesize = IPT_ALIGN(sizeof(struct ipt_set_info_match)),
+ .help = &help,
+ .init = &init,
+ .parse = &parse,
+ .final_check = &final_check,
+ .print = &print,
+ .save = &save,
+ .extra_opts = opts
+};
+
+void _init(void)
+{
+ register_match(&set);
+}