[mirror_ubuntu-bionic-kernel.git] / net / netfilter / xt_set.c

/* Copyright (C) 2000-2002 Joakim Axelsson <gozem@linux.nu>
 *                         Patrick Schaaf <bof@bof.de>
 *                         Martin Josefsson <gandalf@wlug.westbo.se>
 * Copyright (C) 2003-2013 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.
 */

/* Kernel module which implements the set match and SET target
 * for netfilter/iptables. */

#include <linux/module.h>
#include <linux/skbuff.h>

#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/xt_set.h>
#include <linux/netfilter/ipset/ip_set_timeout.h>

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
MODULE_DESCRIPTION("Xtables: IP set match and target module");
MODULE_ALIAS("xt_SET");
MODULE_ALIAS("ipt_set");
MODULE_ALIAS("ip6t_set");
MODULE_ALIAS("ipt_SET");
MODULE_ALIAS("ip6t_SET");

static inline int
match_set(ip_set_id_t index, const struct sk_buff *skb,
	  const struct xt_action_param *par,
	  struct ip_set_adt_opt *opt, int inv)
{
	if (ip_set_test(index, skb, par, opt))
		inv = !inv;
	return inv;
}

#define ADT_OPT(n, f, d, fs, cfs, t)	\
struct ip_set_adt_opt n = {		\
	.family	= f,			\
	.dim = d,			\
	.flags = fs,			\
	.cmdflags = cfs,		\
	.ext.timeout = t,		\
}

/* Revision 0 interface: backward compatible with netfilter/iptables */

static bool
set_match_v0(const struct sk_buff *skb, struct xt_action_param *par)
{
	const struct xt_set_info_match_v0 *info = par->matchinfo;
	ADT_OPT(opt, par->family, info->match_set.u.compat.dim,
		info->match_set.u.compat.flags, 0, UINT_MAX);

	return match_set(info->match_set.index, skb, par, &opt,
			 info->match_set.u.compat.flags & IPSET_INV_MATCH);
}

static void
compat_flags(struct xt_set_info_v0 *info)
{
	u_int8_t i;

	/* Fill out compatibility data according to enum ip_set_kopt */
	info->u.compat.dim = IPSET_DIM_ZERO;
	if (info->u.flags[0] & IPSET_MATCH_INV)
		info->u.compat.flags |= IPSET_INV_MATCH;
	for (i = 0; i < IPSET_DIM_MAX-1 && info->u.flags[i]; i++) {
		info->u.compat.dim++;
		if (info->u.flags[i] & IPSET_SRC)
			info->u.compat.flags |= (1<<info->u.compat.dim);
	}
}

static int
set_match_v0_checkentry(const struct xt_mtchk_param *par)
{
	struct xt_set_info_match_v0 *info = par->matchinfo;
	ip_set_id_t index;

	index = ip_set_nfnl_get_byindex(info->match_set.index);

	if (index == IPSET_INVALID_ID) {
		pr_warning("Cannot find set indentified by id %u to match\n",
			   info->match_set.index);
		return -ENOENT;
	}
	if (info->match_set.u.flags[IPSET_DIM_MAX-1] != 0) {
		pr_warning("Protocol error: set match dimension "
			   "is over the limit!\n");
		ip_set_nfnl_put(info->match_set.index);
		return -ERANGE;
	}

	/* Fill out compatibility data */
	compat_flags(&info->match_set);

	return 0;
}

static void
set_match_v0_destroy(const struct xt_mtdtor_param *par)
{
	struct xt_set_info_match_v0 *info = par->matchinfo;

	ip_set_nfnl_put(info->match_set.index);
}

/* Revision 1 match */

static bool
set_match_v1(const struct sk_buff *skb, struct xt_action_param *par)
{
	const struct xt_set_info_match_v1 *info = par->matchinfo;
	ADT_OPT(opt, par->family, info->match_set.dim,
		info->match_set.flags, 0, UINT_MAX);

	if (opt.flags & IPSET_RETURN_NOMATCH)
		opt.cmdflags |= IPSET_FLAG_RETURN_NOMATCH;

	return match_set(info->match_set.index, skb, par, &opt,
			 info->match_set.flags & IPSET_INV_MATCH);
}

static int
set_match_v1_checkentry(const struct xt_mtchk_param *par)
{
	struct xt_set_info_match_v1 *info = par->matchinfo;
	ip_set_id_t index;

	index = ip_set_nfnl_get_byindex(info->match_set.index);

	if (index == IPSET_INVALID_ID) {
		pr_warning("Cannot find set indentified by id %u to match\n",
			   info->match_set.index);
		return -ENOENT;
	}
	if (info->match_set.dim > IPSET_DIM_MAX) {
		pr_warning("Protocol error: set match dimension "
			   "is over the limit!\n");
		ip_set_nfnl_put(info->match_set.index);
		return -ERANGE;
	}

	return 0;
}

static void
set_match_v1_destroy(const struct xt_mtdtor_param *par)
{
	struct xt_set_info_match_v1 *info = par->matchinfo;

	ip_set_nfnl_put(info->match_set.index);
}

/* Revision 3 match */

static bool
match_counter(u64 counter, const struct ip_set_counter_match *info)
{
	switch (info->op) {
	case IPSET_COUNTER_NONE:
		return true;
	case IPSET_COUNTER_EQ:
		return counter == info->value;
	case IPSET_COUNTER_NE:
		return counter != info->value;
	case IPSET_COUNTER_LT:
		return counter < info->value;
	case IPSET_COUNTER_GT:
		return counter > info->value;
	}
	return false;
}

static bool
set_match_v3(const struct sk_buff *skb, struct xt_action_param *par)
{
	const struct xt_set_info_match_v3 *info = par->matchinfo;
	ADT_OPT(opt, par->family, info->match_set.dim,
		info->match_set.flags, info->flags, UINT_MAX);
	int ret;

	if (info->packets.op != IPSET_COUNTER_NONE ||
	    info->bytes.op != IPSET_COUNTER_NONE)
		opt.cmdflags |= IPSET_FLAG_MATCH_COUNTERS;

	ret = match_set(info->match_set.index, skb, par, &opt,
			info->match_set.flags & IPSET_INV_MATCH);

	if (!(ret && opt.cmdflags & IPSET_FLAG_MATCH_COUNTERS))
		return ret;

	if (!match_counter(opt.ext.packets, &info->packets))
		return 0;
	return match_counter(opt.ext.bytes, &info->bytes);
}

#define set_match_v3_checkentry	set_match_v1_checkentry
#define set_match_v3_destroy	set_match_v1_destroy

/* Revision 0 interface: backward compatible with netfilter/iptables */

static unsigned int
set_target_v0(struct sk_buff *skb, const struct xt_action_param *par)
{
	const struct xt_set_info_target_v0 *info = par->targinfo;
	ADT_OPT(add_opt, par->family, info->add_set.u.compat.dim,
		info->add_set.u.compat.flags, 0, UINT_MAX);
	ADT_OPT(del_opt, par->family, info->del_set.u.compat.dim,
		info->del_set.u.compat.flags, 0, UINT_MAX);

	if (info->add_set.index != IPSET_INVALID_ID)
		ip_set_add(info->add_set.index, skb, par, &add_opt);
	if (info->del_set.index != IPSET_INVALID_ID)
		ip_set_del(info->del_set.index, skb, par, &del_opt);

	return XT_CONTINUE;
}

static int
set_target_v0_checkentry(const struct xt_tgchk_param *par)
{
	struct xt_set_info_target_v0 *info = par->targinfo;
	ip_set_id_t index;

	if (info->add_set.index != IPSET_INVALID_ID) {
		index = ip_set_nfnl_get_byindex(info->add_set.index);
		if (index == IPSET_INVALID_ID) {
			pr_warning("Cannot find add_set index %u as target\n",
				   info->add_set.index);
			return -ENOENT;
		}
	}

	if (info->del_set.index != IPSET_INVALID_ID) {
		index = ip_set_nfnl_get_byindex(info->del_set.index);
		if (index == IPSET_INVALID_ID) {
			pr_warning("Cannot find del_set index %u as target\n",
				   info->del_set.index);
			if (info->add_set.index != IPSET_INVALID_ID)
				ip_set_nfnl_put(info->add_set.index);
			return -ENOENT;
		}
	}
	if (info->add_set.u.flags[IPSET_DIM_MAX-1] != 0 ||
	    info->del_set.u.flags[IPSET_DIM_MAX-1] != 0) {
		pr_warning("Protocol error: SET target dimension "
			   "is over the limit!\n");
		if (info->add_set.index != IPSET_INVALID_ID)
			ip_set_nfnl_put(info->add_set.index);
		if (info->del_set.index != IPSET_INVALID_ID)
			ip_set_nfnl_put(info->del_set.index);
		return -ERANGE;
	}

	/* Fill out compatibility data */
	compat_flags(&info->add_set);
	compat_flags(&info->del_set);

	return 0;
}

static void
set_target_v0_destroy(const struct xt_tgdtor_param *par)
{
	const struct xt_set_info_target_v0 *info = par->targinfo;

	if (info->add_set.index != IPSET_INVALID_ID)
		ip_set_nfnl_put(info->add_set.index);
	if (info->del_set.index != IPSET_INVALID_ID)
		ip_set_nfnl_put(info->del_set.index);
}

/* Revision 1 target */

static unsigned int
set_target_v1(struct sk_buff *skb, const struct xt_action_param *par)
{
	const struct xt_set_info_target_v1 *info = par->targinfo;
	ADT_OPT(add_opt, par->family, info->add_set.dim,
		info->add_set.flags, 0, UINT_MAX);
	ADT_OPT(del_opt, par->family, info->del_set.dim,
		info->del_set.flags, 0, UINT_MAX);

	if (info->add_set.index != IPSET_INVALID_ID)
		ip_set_add(info->add_set.index, skb, par, &add_opt);
	if (info->del_set.index != IPSET_INVALID_ID)
		ip_set_del(info->del_set.index, skb, par, &del_opt);

	return XT_CONTINUE;
}

static int
set_target_v1_checkentry(const struct xt_tgchk_param *par)
{
	const struct xt_set_info_target_v1 *info = par->targinfo;
	ip_set_id_t index;

	if (info->add_set.index != IPSET_INVALID_ID) {
		index = ip_set_nfnl_get_byindex(info->add_set.index);
		if (index == IPSET_INVALID_ID) {
			pr_warning("Cannot find add_set index %u as target\n",
				   info->add_set.index);
			return -ENOENT;
		}
	}

	if (info->del_set.index != IPSET_INVALID_ID) {
		index = ip_set_nfnl_get_byindex(info->del_set.index);
		if (index == IPSET_INVALID_ID) {
			pr_warning("Cannot find del_set index %u as target\n",
				   info->del_set.index);
			if (info->add_set.index != IPSET_INVALID_ID)
				ip_set_nfnl_put(info->add_set.index);
			return -ENOENT;
		}
	}
	if (info->add_set.dim > IPSET_DIM_MAX ||
	    info->del_set.dim > IPSET_DIM_MAX) {
		pr_warning("Protocol error: SET target dimension "
			   "is over the limit!\n");
		if (info->add_set.index != IPSET_INVALID_ID)
			ip_set_nfnl_put(info->add_set.index);
		if (info->del_set.index != IPSET_INVALID_ID)
			ip_set_nfnl_put(info->del_set.index);
		return -ERANGE;
	}

	return 0;
}

static void
set_target_v1_destroy(const struct xt_tgdtor_param *par)
{
	const struct xt_set_info_target_v1 *info = par->targinfo;

	if (info->add_set.index != IPSET_INVALID_ID)
		ip_set_nfnl_put(info->add_set.index);
	if (info->del_set.index != IPSET_INVALID_ID)
		ip_set_nfnl_put(info->del_set.index);
}

/* Revision 2 target */

static unsigned int
set_target_v2(struct sk_buff *skb, const struct xt_action_param *par)
{
	const struct xt_set_info_target_v2 *info = par->targinfo;
	ADT_OPT(add_opt, par->family, info->add_set.dim,
		info->add_set.flags, info->flags, info->timeout);
	ADT_OPT(del_opt, par->family, info->del_set.dim,
		info->del_set.flags, 0, UINT_MAX);

	/* Normalize to fit into jiffies */
	if (add_opt.ext.timeout != IPSET_NO_TIMEOUT &&
	    add_opt.ext.timeout > UINT_MAX/MSEC_PER_SEC)
		add_opt.ext.timeout = UINT_MAX/MSEC_PER_SEC;
	if (info->add_set.index != IPSET_INVALID_ID)
		ip_set_add(info->add_set.index, skb, par, &add_opt);
	if (info->del_set.index != IPSET_INVALID_ID)
		ip_set_del(info->del_set.index, skb, par, &del_opt);

	return XT_CONTINUE;
}

#define set_target_v2_checkentry	set_target_v1_checkentry
#define set_target_v2_destroy		set_target_v1_destroy

static struct xt_match set_matches[] __read_mostly = {
	{
		.name		= "set",
		.family		= NFPROTO_IPV4,
		.revision	= 0,
		.match		= set_match_v0,
		.matchsize	= sizeof(struct xt_set_info_match_v0),
		.checkentry	= set_match_v0_checkentry,
		.destroy	= set_match_v0_destroy,
		.me		= THIS_MODULE
	},
	{
		.name		= "set",
		.family		= NFPROTO_IPV4,
		.revision	= 1,
		.match		= set_match_v1,
		.matchsize	= sizeof(struct xt_set_info_match_v1),
		.checkentry	= set_match_v1_checkentry,
		.destroy	= set_match_v1_destroy,
		.me		= THIS_MODULE
	},
	{
		.name		= "set",
		.family		= NFPROTO_IPV6,
		.revision	= 1,
		.match		= set_match_v1,
		.matchsize	= sizeof(struct xt_set_info_match_v1),
		.checkentry	= set_match_v1_checkentry,
		.destroy	= set_match_v1_destroy,
		.me		= THIS_MODULE
	},
	/* --return-nomatch flag support */
	{
		.name		= "set",
		.family		= NFPROTO_IPV4,
		.revision	= 2,
		.match		= set_match_v1,
		.matchsize	= sizeof(struct xt_set_info_match_v1),
		.checkentry	= set_match_v1_checkentry,
		.destroy	= set_match_v1_destroy,
		.me		= THIS_MODULE
	},
	{
		.name		= "set",
		.family		= NFPROTO_IPV6,
		.revision	= 2,
		.match		= set_match_v1,
		.matchsize	= sizeof(struct xt_set_info_match_v1),
		.checkentry	= set_match_v1_checkentry,
		.destroy	= set_match_v1_destroy,
		.me		= THIS_MODULE
	},
	/* counters support: update, match */
	{
		.name		= "set",
		.family		= NFPROTO_IPV4,
		.revision	= 3,
		.match		= set_match_v3,
		.matchsize	= sizeof(struct xt_set_info_match_v3),
		.checkentry	= set_match_v3_checkentry,
		.destroy	= set_match_v3_destroy,
		.me		= THIS_MODULE
	},
	{
		.name		= "set",
		.family		= NFPROTO_IPV6,
		.revision	= 3,
		.match		= set_match_v3,
		.matchsize	= sizeof(struct xt_set_info_match_v3),
		.checkentry	= set_match_v3_checkentry,
		.destroy	= set_match_v3_destroy,
		.me		= THIS_MODULE
	},
};

static struct xt_target set_targets[] __read_mostly = {
	{
		.name		= "SET",
		.revision	= 0,
		.family		= NFPROTO_IPV4,
		.target		= set_target_v0,
		.targetsize	= sizeof(struct xt_set_info_target_v0),
		.checkentry	= set_target_v0_checkentry,
		.destroy	= set_target_v0_destroy,
		.me		= THIS_MODULE
	},
	{
		.name		= "SET",
		.revision	= 1,
		.family		= NFPROTO_IPV4,
		.target		= set_target_v1,
		.targetsize	= sizeof(struct xt_set_info_target_v1),
		.checkentry	= set_target_v1_checkentry,
		.destroy	= set_target_v1_destroy,
		.me		= THIS_MODULE
	},
	{
		.name		= "SET",
		.revision	= 1,
		.family		= NFPROTO_IPV6,
		.target		= set_target_v1,
		.targetsize	= sizeof(struct xt_set_info_target_v1),
		.checkentry	= set_target_v1_checkentry,
		.destroy	= set_target_v1_destroy,
		.me		= THIS_MODULE
	},
	/* --timeout and --exist flags support */
	{
		.name		= "SET",
		.revision	= 2,
		.family		= NFPROTO_IPV4,
		.target		= set_target_v2,
		.targetsize	= sizeof(struct xt_set_info_target_v2),
		.checkentry	= set_target_v2_checkentry,
		.destroy	= set_target_v2_destroy,
		.me		= THIS_MODULE
	},
	{
		.name		= "SET",
		.revision	= 2,
		.family		= NFPROTO_IPV6,
		.target		= set_target_v2,
		.targetsize	= sizeof(struct xt_set_info_target_v2),
		.checkentry	= set_target_v2_checkentry,
		.destroy	= set_target_v2_destroy,
		.me		= THIS_MODULE
	},
};

static int __init xt_set_init(void)
{
	int ret = xt_register_matches(set_matches, ARRAY_SIZE(set_matches));

	if (!ret) {
		ret = xt_register_targets(set_targets,
					  ARRAY_SIZE(set_targets));
		if (ret)
			xt_unregister_matches(set_matches,
					      ARRAY_SIZE(set_matches));
	}
	return ret;
}

static void __exit xt_set_fini(void)
{
	xt_unregister_matches(set_matches, ARRAY_SIZE(set_matches));
	xt_unregister_targets(set_targets, ARRAY_SIZE(set_targets));
}

module_init(xt_set_init);
module_exit(xt_set_fini);
Commit	Line	Data
d956798d JK	1	/* Copyright (C) 2000-2002 Joakim Axelsson <gozem@linux.nu>
	2	* Patrick Schaaf <bof@bof.de>
	3	* Martin Josefsson <gandalf@wlug.westbo.se>
075e64c0	4	* Copyright (C) 2003-2013 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
d956798d JK	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*/
	10
	11	/* Kernel module which implements the set match and SET target
	12	* for netfilter/iptables. */
	13
	14	#include <linux/module.h>
	15	#include <linux/skbuff.h>
d956798d JK	16
	17	#include <linux/netfilter/x_tables.h>
	18	#include <linux/netfilter/xt_set.h>
a73f89a6	19	#include <linux/netfilter/ipset/ip_set_timeout.h>
d956798d JK	20
	21	MODULE_LICENSE("GPL");
	22	MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
	23	MODULE_DESCRIPTION("Xtables: IP set match and target module");
	24	MODULE_ALIAS("xt_SET");
	25	MODULE_ALIAS("ipt_set");
	26	MODULE_ALIAS("ip6t_set");
	27	MODULE_ALIAS("ipt_SET");
	28	MODULE_ALIAS("ip6t_SET");
	29
	30	static inline int
	31	match_set(ip_set_id_t index, const struct sk_buff *skb,
b66554cf	32	const struct xt_action_param *par,
075e64c0	33	struct ip_set_adt_opt *opt, int inv)
d956798d	34	{
b66554cf	35	if (ip_set_test(index, skb, par, opt))
d956798d JK	36	inv = !inv;
	37	return inv;
	38	}
	39
15b4d93f	40	#define ADT_OPT(n, f, d, fs, cfs, t) \
127f5591 JK	41	struct ip_set_adt_opt n = { \
	42	.family = f, \
	43	.dim = d, \
	44	.flags = fs, \
	45	.cmdflags = cfs, \
075e64c0	46	.ext.timeout = t, \
127f5591	47	}
ac8cc925	48
d956798d JK	49	/* Revision 0 interface: backward compatible with netfilter/iptables */
	50
	51	static bool
	52	set_match_v0(const struct sk_buff skb, struct xt_action_param par)
	53	{
	54	const struct xt_set_info_match_v0 *info = par->matchinfo;
ac8cc925 JK	55	ADT_OPT(opt, par->family, info->match_set.u.compat.dim,
ac8cc925 JK	56	info->match_set.u.compat.flags, 0, UINT_MAX);
d956798d	57
b66554cf	58	return match_set(info->match_set.index, skb, par, &opt,
d956798d JK	59	info->match_set.u.compat.flags & IPSET_INV_MATCH);
	60	}
	61
	62	static void
	63	compat_flags(struct xt_set_info_v0 *info)
	64	{
	65	u_int8_t i;
	66
	67	/* Fill out compatibility data according to enum ip_set_kopt */
	68	info->u.compat.dim = IPSET_DIM_ZERO;
	69	if (info->u.flags[0] & IPSET_MATCH_INV)
	70	info->u.compat.flags \|= IPSET_INV_MATCH;
	71	for (i = 0; i < IPSET_DIM_MAX-1 && info->u.flags[i]; i++) {
	72	info->u.compat.dim++;
	73	if (info->u.flags[i] & IPSET_SRC)
	74	info->u.compat.flags \|= (1<<info->u.compat.dim);
	75	}
	76	}
	77
	78	static int
	79	set_match_v0_checkentry(const struct xt_mtchk_param *par)
	80	{
	81	struct xt_set_info_match_v0 *info = par->matchinfo;
	82	ip_set_id_t index;
	83
	84	index = ip_set_nfnl_get_byindex(info->match_set.index);
	85
	86	if (index == IPSET_INVALID_ID) {
	87	pr_warning("Cannot find set indentified by id %u to match\n",
	88	info->match_set.index);
	89	return -ENOENT;
	90	}
	91	if (info->match_set.u.flags[IPSET_DIM_MAX-1] != 0) {
	92	pr_warning("Protocol error: set match dimension "
	93	"is over the limit!\n");
eafbd3fd	94	ip_set_nfnl_put(info->match_set.index);
d956798d JK	95	return -ERANGE;
	96	}
	97
	98	/* Fill out compatibility data */
	99	compat_flags(&info->match_set);
	100
	101	return 0;
	102	}
	103
	104	static void
	105	set_match_v0_destroy(const struct xt_mtdtor_param *par)
	106	{
	107	struct xt_set_info_match_v0 *info = par->matchinfo;
	108
	109	ip_set_nfnl_put(info->match_set.index);
	110	}
	111
bd3129fc JK	112	/* Revision 1 match */
	113
	114	static bool
	115	set_match_v1(const struct sk_buff skb, struct xt_action_param par)
	116	{
	117	const struct xt_set_info_match_v1 *info = par->matchinfo;
	118	ADT_OPT(opt, par->family, info->match_set.dim,
	119	info->match_set.flags, 0, UINT_MAX);
	120
	121	if (opt.flags & IPSET_RETURN_NOMATCH)
	122	opt.cmdflags \|= IPSET_FLAG_RETURN_NOMATCH;
	123
	124	return match_set(info->match_set.index, skb, par, &opt,
	125	info->match_set.flags & IPSET_INV_MATCH);
	126	}
	127
	128	static int
	129	set_match_v1_checkentry(const struct xt_mtchk_param *par)
	130	{
	131	struct xt_set_info_match_v1 *info = par->matchinfo;
	132	ip_set_id_t index;
	133
	134	index = ip_set_nfnl_get_byindex(info->match_set.index);
	135
	136	if (index == IPSET_INVALID_ID) {
	137	pr_warning("Cannot find set indentified by id %u to match\n",
	138	info->match_set.index);
	139	return -ENOENT;
	140	}
	141	if (info->match_set.dim > IPSET_DIM_MAX) {
	142	pr_warning("Protocol error: set match dimension "
	143	"is over the limit!\n");
	144	ip_set_nfnl_put(info->match_set.index);
	145	return -ERANGE;
	146	}
	147
	148	return 0;
	149	}
	150
	151	static void
	152	set_match_v1_destroy(const struct xt_mtdtor_param *par)
	153	{
	154	struct xt_set_info_match_v1 *info = par->matchinfo;
	155
	156	ip_set_nfnl_put(info->match_set.index);
	157	}
	158
	159	/* Revision 3 match */
	160
	161	static bool
	162	match_counter(u64 counter, const struct ip_set_counter_match *info)
	163	{
	164	switch (info->op) {
	165	case IPSET_COUNTER_NONE:
	166	return true;
	167	case IPSET_COUNTER_EQ:
	168	return counter == info->value;
	169	case IPSET_COUNTER_NE:
	170	return counter != info->value;
	171	case IPSET_COUNTER_LT:
	172	return counter < info->value;
	173	case IPSET_COUNTER_GT:
	174	return counter > info->value;
	175	}
176	return false;
177	}
178
179	static bool
180	set_match_v3(const struct sk_buff skb, struct xt_action_param par)
181	{
182	const struct xt_set_info_match_v3 *info = par->matchinfo;
183	ADT_OPT(opt, par->family, info->match_set.dim,
184	info->match_set.flags, info->flags, UINT_MAX);
185	int ret;
186
187	if (info->packets.op != IPSET_COUNTER_NONE \|\|
188	info->bytes.op != IPSET_COUNTER_NONE)
189	opt.cmdflags \|= IPSET_FLAG_MATCH_COUNTERS;
190
191	ret = match_set(info->match_set.index, skb, par, &opt,
192	info->match_set.flags & IPSET_INV_MATCH);
193
194	if (!(ret && opt.cmdflags & IPSET_FLAG_MATCH_COUNTERS))
195	return ret;
196
197	if (!match_counter(opt.ext.packets, &info->packets))
198	return 0;
199	return match_counter(opt.ext.bytes, &info->bytes);
200	}
201
202	#define set_match_v3_checkentry set_match_v1_checkentry
203	#define set_match_v3_destroy set_match_v1_destroy
204
205	/* Revision 0 interface: backward compatible with netfilter/iptables */
206
d956798d JK	207	static unsigned int
	208	set_target_v0(struct sk_buff skb, const struct xt_action_param par)
	209	{
	210	const struct xt_set_info_target_v0 *info = par->targinfo;
ac8cc925 JK	211	ADT_OPT(add_opt, par->family, info->add_set.u.compat.dim,
	212	info->add_set.u.compat.flags, 0, UINT_MAX);
	213	ADT_OPT(del_opt, par->family, info->del_set.u.compat.dim,
	214	info->del_set.u.compat.flags, 0, UINT_MAX);
d956798d JK	215
d956798d JK	216	if (info->add_set.index != IPSET_INVALID_ID)
b66554cf	217	ip_set_add(info->add_set.index, skb, par, &add_opt);
d956798d	218	if (info->del_set.index != IPSET_INVALID_ID)
b66554cf	219	ip_set_del(info->del_set.index, skb, par, &del_opt);
d956798d JK	220
	221	return XT_CONTINUE;
	222	}
	223
	224	static int
	225	set_target_v0_checkentry(const struct xt_tgchk_param *par)
	226	{
	227	struct xt_set_info_target_v0 *info = par->targinfo;
	228	ip_set_id_t index;
	229
	230	if (info->add_set.index != IPSET_INVALID_ID) {
	231	index = ip_set_nfnl_get_byindex(info->add_set.index);
	232	if (index == IPSET_INVALID_ID) {
	233	pr_warning("Cannot find add_set index %u as target\n",
	234	info->add_set.index);
	235	return -ENOENT;
	236	}
	237	}
	238
	239	if (info->del_set.index != IPSET_INVALID_ID) {
	240	index = ip_set_nfnl_get_byindex(info->del_set.index);
	241	if (index == IPSET_INVALID_ID) {
	242	pr_warning("Cannot find del_set index %u as target\n",
	243	info->del_set.index);
eafbd3fd JK	244	if (info->add_set.index != IPSET_INVALID_ID)
eafbd3fd JK	245	ip_set_nfnl_put(info->add_set.index);
d956798d JK	246	return -ENOENT;
	247	}
	248	}
	249	if (info->add_set.u.flags[IPSET_DIM_MAX-1] != 0 \|\|
	250	info->del_set.u.flags[IPSET_DIM_MAX-1] != 0) {
	251	pr_warning("Protocol error: SET target dimension "
	252	"is over the limit!\n");
eafbd3fd JK	253	if (info->add_set.index != IPSET_INVALID_ID)
	254	ip_set_nfnl_put(info->add_set.index);
	255	if (info->del_set.index != IPSET_INVALID_ID)
	256	ip_set_nfnl_put(info->del_set.index);
d956798d JK	257	return -ERANGE;
	258	}
	259
	260	/* Fill out compatibility data */
	261	compat_flags(&info->add_set);
	262	compat_flags(&info->del_set);
	263
	264	return 0;
	265	}
	266
	267	static void
	268	set_target_v0_destroy(const struct xt_tgdtor_param *par)
	269	{
	270	const struct xt_set_info_target_v0 *info = par->targinfo;
	271
	272	if (info->add_set.index != IPSET_INVALID_ID)
	273	ip_set_nfnl_put(info->add_set.index);
	274	if (info->del_set.index != IPSET_INVALID_ID)
	275	ip_set_nfnl_put(info->del_set.index);
	276	}
	277
bd3129fc	278	/* Revision 1 target */
d956798d JK	279
d956798d JK	280	static unsigned int
ac8cc925	281	set_target_v1(struct sk_buff skb, const struct xt_action_param par)
d956798d	282	{
ac8cc925 JK	283	const struct xt_set_info_target_v1 *info = par->targinfo;
	284	ADT_OPT(add_opt, par->family, info->add_set.dim,
	285	info->add_set.flags, 0, UINT_MAX);
	286	ADT_OPT(del_opt, par->family, info->del_set.dim,
	287	info->del_set.flags, 0, UINT_MAX);
d956798d JK	288
d956798d JK	289	if (info->add_set.index != IPSET_INVALID_ID)
b66554cf	290	ip_set_add(info->add_set.index, skb, par, &add_opt);
d956798d	291	if (info->del_set.index != IPSET_INVALID_ID)
b66554cf	292	ip_set_del(info->del_set.index, skb, par, &del_opt);
d956798d JK	293
	294	return XT_CONTINUE;
	295	}
	296
	297	static int
ac8cc925	298	set_target_v1_checkentry(const struct xt_tgchk_param *par)
d956798d	299	{
ac8cc925	300	const struct xt_set_info_target_v1 *info = par->targinfo;
d956798d JK	301	ip_set_id_t index;
	302
	303	if (info->add_set.index != IPSET_INVALID_ID) {
	304	index = ip_set_nfnl_get_byindex(info->add_set.index);
	305	if (index == IPSET_INVALID_ID) {
	306	pr_warning("Cannot find add_set index %u as target\n",
	307	info->add_set.index);
	308	return -ENOENT;
	309	}
	310	}
	311
	312	if (info->del_set.index != IPSET_INVALID_ID) {
	313	index = ip_set_nfnl_get_byindex(info->del_set.index);
	314	if (index == IPSET_INVALID_ID) {
	315	pr_warning("Cannot find del_set index %u as target\n",
	316	info->del_set.index);
eafbd3fd JK	317	if (info->add_set.index != IPSET_INVALID_ID)
eafbd3fd JK	318	ip_set_nfnl_put(info->add_set.index);
d956798d JK	319	return -ENOENT;
	320	}
	321	}
	322	if (info->add_set.dim > IPSET_DIM_MAX \|\|
eafbd3fd	323	info->del_set.dim > IPSET_DIM_MAX) {
d956798d JK	324	pr_warning("Protocol error: SET target dimension "
d956798d JK	325	"is over the limit!\n");
eafbd3fd JK	326	if (info->add_set.index != IPSET_INVALID_ID)
	327	ip_set_nfnl_put(info->add_set.index);
	328	if (info->del_set.index != IPSET_INVALID_ID)
	329	ip_set_nfnl_put(info->del_set.index);
d956798d JK	330	return -ERANGE;
	331	}
	332
	333	return 0;
	334	}
	335
	336	static void
ac8cc925	337	set_target_v1_destroy(const struct xt_tgdtor_param *par)
d956798d	338	{
ac8cc925	339	const struct xt_set_info_target_v1 *info = par->targinfo;
d956798d JK	340
	341	if (info->add_set.index != IPSET_INVALID_ID)
	342	ip_set_nfnl_put(info->add_set.index);
	343	if (info->del_set.index != IPSET_INVALID_ID)
	344	ip_set_nfnl_put(info->del_set.index);
	345	}
	346
ac8cc925 JK	347	/* Revision 2 target */
	348
	349	static unsigned int
	350	set_target_v2(struct sk_buff skb, const struct xt_action_param par)
	351	{
	352	const struct xt_set_info_target_v2 *info = par->targinfo;
075e64c0 JK	353	ADT_OPT(add_opt, par->family, info->add_set.dim,
075e64c0 JK	354	info->add_set.flags, info->flags, info->timeout);
ac8cc925 JK	355	ADT_OPT(del_opt, par->family, info->del_set.dim,
	356	info->del_set.flags, 0, UINT_MAX);
	357
127f5591	358	/* Normalize to fit into jiffies */
075e64c0 JK	359	if (add_opt.ext.timeout != IPSET_NO_TIMEOUT &&
	360	add_opt.ext.timeout > UINT_MAX/MSEC_PER_SEC)
	361	add_opt.ext.timeout = UINT_MAX/MSEC_PER_SEC;
ac8cc925	362	if (info->add_set.index != IPSET_INVALID_ID)
b66554cf	363	ip_set_add(info->add_set.index, skb, par, &add_opt);
ac8cc925	364	if (info->del_set.index != IPSET_INVALID_ID)
b66554cf	365	ip_set_del(info->del_set.index, skb, par, &del_opt);
ac8cc925 JK	366
	367	return XT_CONTINUE;
	368	}
	369
	370	#define set_target_v2_checkentry set_target_v1_checkentry
	371	#define set_target_v2_destroy set_target_v1_destroy
	372
d956798d JK	373	static struct xt_match set_matches[] __read_mostly = {
	374	{
	375	.name = "set",
	376	.family = NFPROTO_IPV4,
	377	.revision = 0,
	378	.match = set_match_v0,
	379	.matchsize = sizeof(struct xt_set_info_match_v0),
	380	.checkentry = set_match_v0_checkentry,
	381	.destroy = set_match_v0_destroy,
	382	.me = THIS_MODULE
	383	},
	384	{
	385	.name = "set",
	386	.family = NFPROTO_IPV4,
	387	.revision = 1,
ac8cc925 JK	388	.match = set_match_v1,
	389	.matchsize = sizeof(struct xt_set_info_match_v1),
	390	.checkentry = set_match_v1_checkentry,
	391	.destroy = set_match_v1_destroy,
d956798d JK	392	.me = THIS_MODULE
	393	},
	394	{
	395	.name = "set",
	396	.family = NFPROTO_IPV6,
	397	.revision = 1,
ac8cc925 JK	398	.match = set_match_v1,
	399	.matchsize = sizeof(struct xt_set_info_match_v1),
	400	.checkentry = set_match_v1_checkentry,
	401	.destroy = set_match_v1_destroy,
d956798d JK	402	.me = THIS_MODULE
d956798d JK	403	},
3e0304a5 JK	404	/* --return-nomatch flag support */
	405	{
	406	.name = "set",
	407	.family = NFPROTO_IPV4,
	408	.revision = 2,
	409	.match = set_match_v1,
	410	.matchsize = sizeof(struct xt_set_info_match_v1),
	411	.checkentry = set_match_v1_checkentry,
	412	.destroy = set_match_v1_destroy,
	413	.me = THIS_MODULE
	414	},
	415	{
	416	.name = "set",
	417	.family = NFPROTO_IPV6,
	418	.revision = 2,
	419	.match = set_match_v1,
	420	.matchsize = sizeof(struct xt_set_info_match_v1),
	421	.checkentry = set_match_v1_checkentry,
	422	.destroy = set_match_v1_destroy,
	423	.me = THIS_MODULE
	424	},
6e01781d JK	425	/* counters support: update, match */
	426	{
	427	.name = "set",
	428	.family = NFPROTO_IPV4,
	429	.revision = 3,
	430	.match = set_match_v3,
	431	.matchsize = sizeof(struct xt_set_info_match_v3),
	432	.checkentry = set_match_v3_checkentry,
	433	.destroy = set_match_v3_destroy,
	434	.me = THIS_MODULE
	435	},
	436	{
	437	.name = "set",
	438	.family = NFPROTO_IPV6,
	439	.revision = 3,
	440	.match = set_match_v3,
	441	.matchsize = sizeof(struct xt_set_info_match_v3),
	442	.checkentry = set_match_v3_checkentry,
	443	.destroy = set_match_v3_destroy,
	444	.me = THIS_MODULE
	445	},
d956798d JK	446	};
	447
	448	static struct xt_target set_targets[] __read_mostly = {
	449	{
	450	.name = "SET",
	451	.revision = 0,
	452	.family = NFPROTO_IPV4,
	453	.target = set_target_v0,
	454	.targetsize = sizeof(struct xt_set_info_target_v0),
	455	.checkentry = set_target_v0_checkentry,
	456	.destroy = set_target_v0_destroy,
	457	.me = THIS_MODULE
	458	},
	459	{
	460	.name = "SET",
	461	.revision = 1,
	462	.family = NFPROTO_IPV4,
ac8cc925 JK	463	.target = set_target_v1,
	464	.targetsize = sizeof(struct xt_set_info_target_v1),
	465	.checkentry = set_target_v1_checkentry,
	466	.destroy = set_target_v1_destroy,
d956798d JK	467	.me = THIS_MODULE
	468	},
	469	{
	470	.name = "SET",
	471	.revision = 1,
	472	.family = NFPROTO_IPV6,
ac8cc925 JK	473	.target = set_target_v1,
	474	.targetsize = sizeof(struct xt_set_info_target_v1),
	475	.checkentry = set_target_v1_checkentry,
	476	.destroy = set_target_v1_destroy,
	477	.me = THIS_MODULE
	478	},
3e0304a5	479	/* --timeout and --exist flags support */
ac8cc925 JK	480	{
	481	.name = "SET",
	482	.revision = 2,
	483	.family = NFPROTO_IPV4,
	484	.target = set_target_v2,
	485	.targetsize = sizeof(struct xt_set_info_target_v2),
	486	.checkentry = set_target_v2_checkentry,
	487	.destroy = set_target_v2_destroy,
	488	.me = THIS_MODULE
	489	},
	490	{
	491	.name = "SET",
	492	.revision = 2,
	493	.family = NFPROTO_IPV6,
	494	.target = set_target_v2,
	495	.targetsize = sizeof(struct xt_set_info_target_v2),
	496	.checkentry = set_target_v2_checkentry,
	497	.destroy = set_target_v2_destroy,
d956798d JK	498	.me = THIS_MODULE
	499	},
	500	};
	501
	502	static int __init xt_set_init(void)
	503	{
	504	int ret = xt_register_matches(set_matches, ARRAY_SIZE(set_matches));
	505
	506	if (!ret) {
	507	ret = xt_register_targets(set_targets,
	508	ARRAY_SIZE(set_targets));
	509	if (ret)
	510	xt_unregister_matches(set_matches,
	511	ARRAY_SIZE(set_matches));
	512	}
	513	return ret;
	514	}
	515
	516	static void __exit xt_set_fini(void)
	517	{
	518	xt_unregister_matches(set_matches, ARRAY_SIZE(set_matches));
	519	xt_unregister_targets(set_targets, ARRAY_SIZE(set_targets));
	520	}
	521
	522	module_init(xt_set_init);
	523	module_exit(xt_set_fini);