--- /dev/null
+/* Shared library add-on to iptables to add IP address pool matching. */
+#include <stdio.h>
+#include <netdb.h>
+#include <string.h>
+#include <stdlib.h>
+#include <getopt.h>
+#include <ctype.h>
+
+#include <iptables.h>
+#include <linux/netfilter_ipv4/ip_conntrack.h>
+#include <linux/netfilter_ipv4/ipt_pool.h>
+
+#include <libippool/ip_pool_support.h>
+
+/* FIXME --RR */
+#include "../ippool/libippool.c"
+
+/* Function which prints out usage message. */
+static void
+help(void)
+{
+ printf(
+"pool v%s options:\n"
+" [!] --srcpool NAME|INDEX\n"
+" [!] --dstpool NAME|INDEX\n"
+" Pool index (or name from %s) to match\n"
+"\n", IPTABLES_VERSION, IPPOOL_CONF);
+}
+
+static struct option opts[] = {
+ { "srcpool", 1, 0, '1' },
+ { "dstpool", 1, 0, '2' },
+ {0}
+};
+
+/* Initialize the match. */
+static void
+init(struct ipt_entry_match *match, unsigned int *nfcache)
+{
+ struct ipt_pool_info *info =
+ (struct ipt_pool_info *)match->data;
+
+ info->src = IP_POOL_NONE;
+ info->dst = IP_POOL_NONE;
+ info->flags = 0;
+}
+
+/* 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_pool_info *info =
+ (struct ipt_pool_info *)(*match)->data;
+
+ switch (c) {
+ case '1':
+ check_inverse(optarg, &invert, &optind, 0);
+ info->src = ip_pool_get_index(argv[optind-1]);
+ if (invert) info->flags |= IPT_POOL_INV_SRC;
+ *flags = 1;
+ break;
+ case '2':
+ check_inverse(optarg, &invert, &optind, 0);
+ info->dst = ip_pool_get_index(argv[optind-1]);
+ if (invert) info->flags |= IPT_POOL_INV_DST;
+ *flags = 1;
+ break;
+
+ default:
+ return 0;
+ }
+
+ return 1;
+}
+
+/* Final check; must have specified --srcpool or --dstpool. */
+static void final_check(unsigned int flags)
+{
+ if (!flags)
+ exit_error(PARAMETER_PROBLEM, "You must specify either `--srcpool or --dstpool'");
+}
+
+/* Prints out the matchinfo. */
+static void
+print(const struct ipt_ip *ip,
+ const struct ipt_entry_match *match,
+ int numeric)
+{
+ char buf[256];
+ struct ipt_pool_info *info =
+ (struct ipt_pool_info *)match->data;
+
+ if (info->src != IP_POOL_NONE)
+ printf("%ssrcpool %s ",
+ (info->flags & IPT_POOL_INV_SRC) ? "!" : "",
+ ip_pool_get_name(buf, sizeof(buf), info->src, 0));
+ if (info->dst != IP_POOL_NONE)
+ printf("%sdstpool %s ",
+ (info->flags & IPT_POOL_INV_DST) ? "!" : "",
+ ip_pool_get_name(buf, sizeof(buf), info->dst, 0));
+}
+
+/* Saves the matchinfo in parsable form to stdout. */
+static void save(const struct ipt_ip *ip, const struct ipt_entry_match *match)
+{
+ char buf[256];
+ struct ipt_pool_info *info =
+ (struct ipt_pool_info *)match->data;
+
+ if (info->src != IP_POOL_NONE)
+ printf("%s--srcpool %s ",
+ (info->flags & IPT_POOL_INV_SRC) ? "! " : "",
+ ip_pool_get_name(buf, sizeof(buf), info->src, 0));
+ if (info->dst != IP_POOL_NONE)
+ printf("%s--dstpool %s ",
+ (info->flags & IPT_POOL_INV_DST) ? "! " : "",
+ ip_pool_get_name(buf, sizeof(buf), info->dst, 0));
+}
+
+static struct iptables_match pool = {
+ .next = NULL,
+ .name = "pool",
+ .version = IPTABLES_VERSION,
+ .size = IPT_ALIGN(sizeof(struct ipt_pool_info)),
+ .userspacesize = IPT_ALIGN(sizeof(struct ipt_pool_info)),
+ .help = &help,
+ .init = &init,
+ .parse = &parse,
+ .final_check = &final_check,
+ .print = &print,
+ .save = &save,
+ .extra_opts = opts
+};
+
+void _init(void)
+{
+ register_match(&pool);
+}