libxt_set: new revision added

libipt_set renamed to libxt_set and the support for the forthcoming
ipset release added. I have tested backward (IPv4) and forward
compatibility (IPv4/IPv6):

ipset -N test iphash
ipset -A test test-address
iptables -N test-set
iptables -A test-set -j LOG --log-prefix "match "
iptables -A test-set -j DROP
iptables -A OUTPUT -m set --match-set test dst -j test-set
ping test-address

1 files changed, 286 insertions, 0 deletions

diff --git a/extensions/libxt_SET.c b/extensions/libxt_SET.c
new file mode 100644
index 00000000..f6386a9e
--- /dev/null
+++ b/extensions/libxt_SET.c
@@ -0,0 +1,286 @@
+/* Copyright (C) 2000-2002 Joakim Axelsson <gozem@linux.nu>
+ *                         Patrick Schaaf <bof@bof.de>
+ *                         Martin Josefsson <gandalf@wlug.westbo.se>
+ * Copyright (C) 2003-2010 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.  
+ */
+
+/* Shared library add-on to iptables to add IP set mangling target. */
+#include <stdio.h>
+#include <netdb.h>
+#include <string.h>
+#include <stdlib.h>
+#include <getopt.h>
+#include <ctype.h>
+
+#include <xtables.h>
+#include <linux/netfilter/xt_set.h>
+#include "libxt_set.h"
+
+static void
+set_target_help(void)
+{
+	printf("SET target options:\n"
+	       " --add-set name flags\n"
+	       " --del-set name flags\n"
+	       "		add/del src/dst IP/port from/to named sets,\n"
+	       "		where flags are the comma separated list of\n"
+	       "		'src' and 'dst' specifications.\n");
+}
+
+static const struct option set_target_opts[] = {
+	{ .name = "add-set", .has_arg = true, .val = '1'},
+	{ .name = "del-set", .has_arg = true, .val = '2'},
+	{ .name = NULL }
+};
+
+static void
+set_target_check(unsigned int flags)
+{
+	if (!flags)
+		xtables_error(PARAMETER_PROBLEM,
+			   "You must specify either `--add-set' or `--del-set'");
+}
+
+static void
+set_target_init_v0(struct xt_entry_target *target)
+{
+	struct xt_set_info_target_v0 *info =
+		(struct xt_set_info_target_v0 *) target->data;
+
+	info->add_set.index =
+	info->del_set.index = IPSET_INVALID_ID;
+
+}
+
+static void
+parse_target_v0(char **argv, int invert, unsigned int *flags,
+		struct xt_set_info_v0 *info, const char *what)
+{
+	if (info->u.flags[0])
+		xtables_error(PARAMETER_PROBLEM,
+			      "--%s can be specified only once", what);
+
+	if (xtables_check_inverse(optarg, &invert, NULL, 0, argv))
+		xtables_error(PARAMETER_PROBLEM,
+			      "Unexpected `!' after --%s", what);
+
+	if (!argv[optind]
+	    || argv[optind][0] == '-' || argv[optind][0] == '!')
+		xtables_error(PARAMETER_PROBLEM,
+			      "--%s requires two args.", what);
+
+	if (strlen(optarg) > IPSET_MAXNAMELEN - 1)
+		xtables_error(PARAMETER_PROBLEM,
+			      "setname `%s' too long, max %d characters.",
+			      optarg, IPSET_MAXNAMELEN - 1);
+
+	get_set_byname(optarg, (struct xt_set_info *)info);
+	parse_dirs_v0(argv[optind], info);
+	optind++;
+	
+	*flags = 1;
+}
+
+static int
+set_target_parse_v0(int c, char **argv, int invert, unsigned int *flags,
+		    const void *entry, struct xt_entry_target **target)
+{
+	struct xt_set_info_target_v0 *myinfo =
+		(struct xt_set_info_target_v0 *) (*target)->data;
+
+	switch (c) {
+	case '1':		/* --add-set <set> <flags> */
+		parse_target_v0(argv, invert, flags,
+				&myinfo->add_set, "add-set");
+		break;
+	case '2':		/* --del-set <set>[:<flags>] <flags> */
+		parse_target_v0(argv, invert, flags,
+				&myinfo->del_set, "del-set");
+		break;
+
+	default:
+		return 0;
+	}
+	return 1;
+}
+
+static void
+print_target_v0(const char *prefix, const struct xt_set_info_v0 *info)
+{
+	int i;
+	char setname[IPSET_MAXNAMELEN];
+
+	if (info->index == IPSET_INVALID_ID)
+		return;
+	get_set_byid(setname, info->index);
+	printf("%s %s", prefix, setname);
+	for (i = 0; i < IPSET_DIM_MAX; i++) {
+		if (!info->u.flags[i])
+			break;		
+		printf("%s%s",
+		       i == 0 ? " " : ",",
+		       info->u.flags[i] & IPSET_SRC ? "src" : "dst");
+	}
+	printf(" ");
+}
+
+static void
+set_target_print_v0(const void *ip, const struct xt_entry_target *target,
+                    int numeric)
+{
+	const struct xt_set_info_target_v0 *info = (const void *)target->data;
+
+	print_target_v0("add-set", &info->add_set);
+	print_target_v0("del-set", &info->del_set);
+}
+
+static void
+set_target_save_v0(const void *ip, const struct xt_entry_target *target)
+{
+	const struct xt_set_info_target_v0 *info = (const void *)target->data;
+
+	print_target_v0("--add-set", &info->add_set);
+	print_target_v0("--del-set", &info->del_set);
+}
+
+static void
+set_target_init(struct xt_entry_target *target)
+{
+	struct xt_set_info_target *info =
+		(struct xt_set_info_target *) target->data;
+
+	info->add_set.index =
+	info->del_set.index = IPSET_INVALID_ID;
+
+}
+
+static void
+parse_target(char **argv, int invert, unsigned int *flags,
+	     struct xt_set_info *info, const char *what)
+{
+	if (info->dim)
+		xtables_error(PARAMETER_PROBLEM,
+			      "--%s can be specified only once", what);
+
+	if (xtables_check_inverse(optarg, &invert, NULL, 0, argv))
+		xtables_error(PARAMETER_PROBLEM,
+			      "Unexpected `!' after --%s", what);
+
+	if (!argv[optind]
+	    || argv[optind][0] == '-' || argv[optind][0] == '!')
+		xtables_error(PARAMETER_PROBLEM,
+			      "--%s requires two args.", what);
+
+	if (strlen(optarg) > IPSET_MAXNAMELEN - 1)
+		xtables_error(PARAMETER_PROBLEM,
+			      "setname `%s' too long, max %d characters.",
+			      optarg, IPSET_MAXNAMELEN - 1);
+
+	get_set_byname(optarg, info);
+	parse_dirs(argv[optind], info);
+	optind++;
+	
+	*flags = 1;
+}
+
+static int
+set_target_parse(int c, char **argv, int invert, unsigned int *flags,
+		 const void *entry, struct xt_entry_target **target)
+{
+	struct xt_set_info_target *myinfo =
+		(struct xt_set_info_target *) (*target)->data;
+
+	switch (c) {
+	case '1':		/* --add-set <set> <flags> */
+		parse_target(argv, invert, flags,
+			     &myinfo->add_set, "add-set");
+		break;
+	case '2':		/* --del-set <set>[:<flags>] <flags> */
+		parse_target(argv, invert, flags,
+			     &myinfo->del_set, "del-set");
+		break;
+
+	default:
+		return 0;
+	}
+	return 1;
+}
+
+static void
+print_target(const char *prefix, const struct xt_set_info *info)
+{
+	int i;
+	char setname[IPSET_MAXNAMELEN];
+
+	if (info->index == IPSET_INVALID_ID)
+		return;
+	get_set_byid(setname, info->index);
+	printf("%s %s", prefix, setname);
+	for (i = 1; i <= IPSET_DIM_MAX; i++) {
+		printf("%s%s",
+		       i == 1 ? " " : ",",
+		       info->flags & (1 << i) ? "src" : "dst");
+	}
+	printf(" ");
+}
+
+static void
+set_target_print(const void *ip, const struct xt_entry_target *target,
+                 int numeric)
+{
+	const struct xt_set_info_target *info = (const void *)target->data;
+
+	print_target("add-set", &info->add_set);
+	print_target("del-set", &info->del_set);
+}
+
+static void
+set_target_save(const void *ip, const struct xt_entry_target *target)
+{
+	const struct xt_set_info_target *info = (const void *)target->data;
+
+	print_target("--add-set", &info->add_set);
+	print_target("--del-set", &info->del_set);
+}
+
+static struct xtables_target set_tg_reg[] = {
+	{
+		.name		= "SET",
+		.revision	= 0,
+		.version	= XTABLES_VERSION,
+		.family		= NFPROTO_IPV4,
+		.size		= XT_ALIGN(sizeof(struct xt_set_info_target_v0)),
+		.userspacesize	= XT_ALIGN(sizeof(struct xt_set_info_target_v0)),
+		.help		= set_target_help,
+		.init		= set_target_init_v0,
+		.parse		= set_target_parse_v0,
+		.final_check	= set_target_check,
+		.print		= set_target_print_v0,
+		.save		= set_target_save_v0,
+		.extra_opts	= set_target_opts,
+	},
+	{
+		.name		= "SET",
+		.revision	= 1,
+		.version	= XTABLES_VERSION,
+		.family		= NFPROTO_UNSPEC,
+		.size		= XT_ALIGN(sizeof(struct xt_set_info_target)),
+		.userspacesize	= XT_ALIGN(sizeof(struct xt_set_info_target)),
+		.help		= set_target_help,
+		.init		= set_target_init,
+		.parse		= set_target_parse,
+		.final_check	= set_target_check,
+		.print		= set_target_print,
+		.save		= set_target_save,
+		.extra_opts	= set_target_opts,
+	},
+};
+
+void _init(void)
+{
+	xtables_register_targets(set_tg_reg, ARRAY_SIZE(set_tg_reg));
+}