[deliverable/linux.git] / net / netfilter / nft_ct.c

/*
 * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
 *
 * 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.
 *
 * Development of this code funded by Astaro AG (http://www.astaro.com/)
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/netlink.h>
#include <linux/netfilter.h>
#include <linux/netfilter/nf_tables.h>
#include <net/netfilter/nf_tables.h>
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_tuple.h>
#include <net/netfilter/nf_conntrack_helper.h>
#include <net/netfilter/nf_conntrack_ecache.h>
#include <net/netfilter/nf_conntrack_labels.h>

struct nft_ct {
	enum nft_ct_keys	key:8;
	enum ip_conntrack_dir	dir:8;
	union {
		enum nft_registers	dreg:8;
		enum nft_registers	sreg:8;
	};
};

static void nft_ct_get_eval(const struct nft_expr *expr,
			    struct nft_data data[NFT_REG_MAX + 1],
			    const struct nft_pktinfo *pkt)
{
	const struct nft_ct *priv = nft_expr_priv(expr);
	struct nft_data *dest = &data[priv->dreg];
	enum ip_conntrack_info ctinfo;
	const struct nf_conn *ct;
	const struct nf_conn_help *help;
	const struct nf_conntrack_tuple *tuple;
	const struct nf_conntrack_helper *helper;
	long diff;
	unsigned int state;

	ct = nf_ct_get(pkt->skb, &ctinfo);

	switch (priv->key) {
	case NFT_CT_STATE:
		if (ct == NULL)
			state = NF_CT_STATE_INVALID_BIT;
		else if (nf_ct_is_untracked(ct))
			state = NF_CT_STATE_UNTRACKED_BIT;
		else
			state = NF_CT_STATE_BIT(ctinfo);
		dest->data[0] = state;
		return;
	default:
		break;
	}

	if (ct == NULL)
		goto err;

	switch (priv->key) {
	case NFT_CT_DIRECTION:
		dest->data[0] = CTINFO2DIR(ctinfo);
		return;
	case NFT_CT_STATUS:
		dest->data[0] = ct->status;
		return;
#ifdef CONFIG_NF_CONNTRACK_MARK
	case NFT_CT_MARK:
		dest->data[0] = ct->mark;
		return;
#endif
#ifdef CONFIG_NF_CONNTRACK_SECMARK
	case NFT_CT_SECMARK:
		dest->data[0] = ct->secmark;
		return;
#endif
	case NFT_CT_EXPIRATION:
		diff = (long)jiffies - (long)ct->timeout.expires;
		if (diff < 0)
			diff = 0;
		dest->data[0] = jiffies_to_msecs(diff);
		return;
	case NFT_CT_HELPER:
		if (ct->master == NULL)
			goto err;
		help = nfct_help(ct->master);
		if (help == NULL)
			goto err;
		helper = rcu_dereference(help->helper);
		if (helper == NULL)
			goto err;
		if (strlen(helper->name) >= sizeof(dest->data))
			goto err;
		strncpy((char *)dest->data, helper->name, sizeof(dest->data));
		return;
#ifdef CONFIG_NF_CONNTRACK_LABELS
	case NFT_CT_LABELS: {
		struct nf_conn_labels *labels = nf_ct_labels_find(ct);
		unsigned int size;

		if (!labels) {
			memset(dest->data, 0, sizeof(dest->data));
			return;
		}

		BUILD_BUG_ON(NF_CT_LABELS_MAX_SIZE > sizeof(dest->data));
		size = labels->words * sizeof(long);

		memcpy(dest->data, labels->bits, size);
		if (size < sizeof(dest->data))
			memset(((char *) dest->data) + size, 0,
			       sizeof(dest->data) - size);
		return;
	}
#endif
	default:
		break;
	}

	tuple = &ct->tuplehash[priv->dir].tuple;
	switch (priv->key) {
	case NFT_CT_L3PROTOCOL:
		dest->data[0] = nf_ct_l3num(ct);
		return;
	case NFT_CT_SRC:
		memcpy(dest->data, tuple->src.u3.all,
		       nf_ct_l3num(ct) == NFPROTO_IPV4 ? 4 : 16);
		return;
	case NFT_CT_DST:
		memcpy(dest->data, tuple->dst.u3.all,
		       nf_ct_l3num(ct) == NFPROTO_IPV4 ? 4 : 16);
		return;
	case NFT_CT_PROTOCOL:
		dest->data[0] = nf_ct_protonum(ct);
		return;
	case NFT_CT_PROTO_SRC:
		dest->data[0] = (__force __u16)tuple->src.u.all;
		return;
	case NFT_CT_PROTO_DST:
		dest->data[0] = (__force __u16)tuple->dst.u.all;
		return;
	default:
		break;
	}
	return;
err:
	data[NFT_REG_VERDICT].verdict = NFT_BREAK;
}

static void nft_ct_set_eval(const struct nft_expr *expr,
			    struct nft_data data[NFT_REG_MAX + 1],
			    const struct nft_pktinfo *pkt)
{
	const struct nft_ct *priv = nft_expr_priv(expr);
	struct sk_buff *skb = pkt->skb;
#ifdef CONFIG_NF_CONNTRACK_MARK
	u32 value = data[priv->sreg].data[0];
#endif
	enum ip_conntrack_info ctinfo;
	struct nf_conn *ct;

	ct = nf_ct_get(skb, &ctinfo);
	if (ct == NULL)
		return;

	switch (priv->key) {
#ifdef CONFIG_NF_CONNTRACK_MARK
	case NFT_CT_MARK:
		if (ct->mark != value) {
			ct->mark = value;
			nf_conntrack_event_cache(IPCT_MARK, ct);
		}
		break;
#endif
	default:
		break;
	}
}

static const struct nla_policy nft_ct_policy[NFTA_CT_MAX + 1] = {
	[NFTA_CT_DREG]		= { .type = NLA_U32 },
	[NFTA_CT_KEY]		= { .type = NLA_U32 },
	[NFTA_CT_DIRECTION]	= { .type = NLA_U8 },
	[NFTA_CT_SREG]		= { .type = NLA_U32 },
};

static int nft_ct_l3proto_try_module_get(uint8_t family)
{
	int err;

	if (family == NFPROTO_INET) {
		err = nf_ct_l3proto_try_module_get(NFPROTO_IPV4);
		if (err < 0)
			goto err1;
		err = nf_ct_l3proto_try_module_get(NFPROTO_IPV6);
		if (err < 0)
			goto err2;
	} else {
		err = nf_ct_l3proto_try_module_get(family);
		if (err < 0)
			goto err1;
	}
	return 0;

err2:
	nf_ct_l3proto_module_put(NFPROTO_IPV4);
err1:
	return err;
}

static void nft_ct_l3proto_module_put(uint8_t family)
{
	if (family == NFPROTO_INET) {
		nf_ct_l3proto_module_put(NFPROTO_IPV4);
		nf_ct_l3proto_module_put(NFPROTO_IPV6);
	} else
		nf_ct_l3proto_module_put(family);
}

static int nft_ct_get_init(const struct nft_ctx *ctx,
			   const struct nft_expr *expr,
			   const struct nlattr * const tb[])
{
	struct nft_ct *priv = nft_expr_priv(expr);
	int err;

	priv->key = ntohl(nla_get_be32(tb[NFTA_CT_KEY]));
	switch (priv->key) {
	case NFT_CT_STATE:
	case NFT_CT_DIRECTION:
	case NFT_CT_STATUS:
#ifdef CONFIG_NF_CONNTRACK_MARK
	case NFT_CT_MARK:
#endif
#ifdef CONFIG_NF_CONNTRACK_SECMARK
	case NFT_CT_SECMARK:
#endif
#ifdef CONFIG_NF_CONNTRACK_LABELS
	case NFT_CT_LABELS:
#endif
	case NFT_CT_EXPIRATION:
	case NFT_CT_HELPER:
		if (tb[NFTA_CT_DIRECTION] != NULL)
			return -EINVAL;
		break;
	case NFT_CT_L3PROTOCOL:
	case NFT_CT_PROTOCOL:
	case NFT_CT_SRC:
	case NFT_CT_DST:
	case NFT_CT_PROTO_SRC:
	case NFT_CT_PROTO_DST:
		if (tb[NFTA_CT_DIRECTION] == NULL)
			return -EINVAL;
		break;
	default:
		return -EOPNOTSUPP;
	}

	if (tb[NFTA_CT_DIRECTION] != NULL) {
		priv->dir = nla_get_u8(tb[NFTA_CT_DIRECTION]);
		switch (priv->dir) {
		case IP_CT_DIR_ORIGINAL:
		case IP_CT_DIR_REPLY:
			break;
		default:
			return -EINVAL;
		}
	}

	priv->dreg = ntohl(nla_get_be32(tb[NFTA_CT_DREG]));
	err = nft_validate_output_register(priv->dreg);
	if (err < 0)
		return err;

	err = nft_validate_data_load(ctx, priv->dreg, NULL, NFT_DATA_VALUE);
	if (err < 0)
		return err;

	err = nft_ct_l3proto_try_module_get(ctx->afi->family);
	if (err < 0)
		return err;

	return 0;
}

static int nft_ct_set_init(const struct nft_ctx *ctx,
			   const struct nft_expr *expr,
			   const struct nlattr * const tb[])
{
	struct nft_ct *priv = nft_expr_priv(expr);
	int err;

	priv->key = ntohl(nla_get_be32(tb[NFTA_CT_KEY]));
	switch (priv->key) {
#ifdef CONFIG_NF_CONNTRACK_MARK
	case NFT_CT_MARK:
		break;
#endif
	default:
		return -EOPNOTSUPP;
	}

	priv->sreg = ntohl(nla_get_be32(tb[NFTA_CT_SREG]));
	err = nft_validate_input_register(priv->sreg);
	if (err < 0)
		return err;

	err = nft_ct_l3proto_try_module_get(ctx->afi->family);
	if (err < 0)
		return err;

	return 0;
}

static void nft_ct_destroy(const struct nft_ctx *ctx,
			   const struct nft_expr *expr)
{
	nft_ct_l3proto_module_put(ctx->afi->family);
}

static int nft_ct_get_dump(struct sk_buff *skb, const struct nft_expr *expr)
{
	const struct nft_ct *priv = nft_expr_priv(expr);

	if (nla_put_be32(skb, NFTA_CT_DREG, htonl(priv->dreg)))
		goto nla_put_failure;
	if (nla_put_be32(skb, NFTA_CT_KEY, htonl(priv->key)))
		goto nla_put_failure;

	switch (priv->key) {
	case NFT_CT_PROTOCOL:
	case NFT_CT_SRC:
	case NFT_CT_DST:
	case NFT_CT_PROTO_SRC:
	case NFT_CT_PROTO_DST:
		if (nla_put_u8(skb, NFTA_CT_DIRECTION, priv->dir))
			goto nla_put_failure;
	default:
		break;
	}

	return 0;

nla_put_failure:
	return -1;
}

static int nft_ct_set_dump(struct sk_buff *skb, const struct nft_expr *expr)
{
	const struct nft_ct *priv = nft_expr_priv(expr);

	if (nla_put_be32(skb, NFTA_CT_SREG, htonl(priv->sreg)))
		goto nla_put_failure;
	if (nla_put_be32(skb, NFTA_CT_KEY, htonl(priv->key)))
		goto nla_put_failure;
	return 0;

nla_put_failure:
	return -1;
}

static struct nft_expr_type nft_ct_type;
static const struct nft_expr_ops nft_ct_get_ops = {
	.type		= &nft_ct_type,
	.size		= NFT_EXPR_SIZE(sizeof(struct nft_ct)),
	.eval		= nft_ct_get_eval,
	.init		= nft_ct_get_init,
	.destroy	= nft_ct_destroy,
	.dump		= nft_ct_get_dump,
};

static const struct nft_expr_ops nft_ct_set_ops = {
	.type		= &nft_ct_type,
	.size		= NFT_EXPR_SIZE(sizeof(struct nft_ct)),
	.eval		= nft_ct_set_eval,
	.init		= nft_ct_set_init,
	.destroy	= nft_ct_destroy,
	.dump		= nft_ct_set_dump,
};

static const struct nft_expr_ops *
nft_ct_select_ops(const struct nft_ctx *ctx,
		    const struct nlattr * const tb[])
{
	if (tb[NFTA_CT_KEY] == NULL)
		return ERR_PTR(-EINVAL);

	if (tb[NFTA_CT_DREG] && tb[NFTA_CT_SREG])
		return ERR_PTR(-EINVAL);

	if (tb[NFTA_CT_DREG])
		return &nft_ct_get_ops;

	if (tb[NFTA_CT_SREG])
		return &nft_ct_set_ops;

	return ERR_PTR(-EINVAL);
}

static struct nft_expr_type nft_ct_type __read_mostly = {
	.name		= "ct",
	.select_ops	= &nft_ct_select_ops,
	.policy		= nft_ct_policy,
	.maxattr	= NFTA_CT_MAX,
	.owner		= THIS_MODULE,
};

static int __init nft_ct_module_init(void)
{
	return nft_register_expr(&nft_ct_type);
}

static void __exit nft_ct_module_exit(void)
{
	nft_unregister_expr(&nft_ct_type);
}

module_init(nft_ct_module_init);
module_exit(nft_ct_module_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
MODULE_ALIAS_NFT_EXPR("ct");
Commit	Line	Data
96518518	1	/*
ef1f7df9	2	* Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
96518518 PM	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License version 2 as
	6	* published by the Free Software Foundation.
	7	*
	8	* Development of this code funded by Astaro AG (http://www.astaro.com/)
	9	*/
	10
	11	#include <linux/kernel.h>
	12	#include <linux/init.h>
	13	#include <linux/module.h>
	14	#include <linux/netlink.h>
	15	#include <linux/netfilter.h>
	16	#include <linux/netfilter/nf_tables.h>
	17	#include <net/netfilter/nf_tables.h>
	18	#include <net/netfilter/nf_conntrack.h>
	19	#include <net/netfilter/nf_conntrack_tuple.h>
	20	#include <net/netfilter/nf_conntrack_helper.h>
c4ede3d3	21	#include <net/netfilter/nf_conntrack_ecache.h>
d2bf2f34	22	#include <net/netfilter/nf_conntrack_labels.h>
96518518 PM	23
	24	struct nft_ct {
	25	enum nft_ct_keys key:8;
	26	enum ip_conntrack_dir dir:8;
d46f2cd2	27	union {
c4ede3d3 KE	28	enum nft_registers dreg:8;
	29	enum nft_registers sreg:8;
	30	};
96518518 PM	31	};
96518518 PM	32
c4ede3d3 KE	33	static void nft_ct_get_eval(const struct nft_expr *expr,
	34	struct nft_data data[NFT_REG_MAX + 1],
	35	const struct nft_pktinfo *pkt)
96518518 PM	36	{
	37	const struct nft_ct *priv = nft_expr_priv(expr);
	38	struct nft_data *dest = &data[priv->dreg];
	39	enum ip_conntrack_info ctinfo;
	40	const struct nf_conn *ct;
	41	const struct nf_conn_help *help;
	42	const struct nf_conntrack_tuple *tuple;
	43	const struct nf_conntrack_helper *helper;
	44	long diff;
	45	unsigned int state;
	46
	47	ct = nf_ct_get(pkt->skb, &ctinfo);
	48
	49	switch (priv->key) {
	50	case NFT_CT_STATE:
	51	if (ct == NULL)
	52	state = NF_CT_STATE_INVALID_BIT;
	53	else if (nf_ct_is_untracked(ct))
	54	state = NF_CT_STATE_UNTRACKED_BIT;
	55	else
	56	state = NF_CT_STATE_BIT(ctinfo);
	57	dest->data[0] = state;
	58	return;
c1f86676 DM	59	default:
c1f86676 DM	60	break;
96518518 PM	61	}
	62
	63	if (ct == NULL)
	64	goto err;
	65
	66	switch (priv->key) {
	67	case NFT_CT_DIRECTION:
	68	dest->data[0] = CTINFO2DIR(ctinfo);
	69	return;
	70	case NFT_CT_STATUS:
	71	dest->data[0] = ct->status;
	72	return;
	73	#ifdef CONFIG_NF_CONNTRACK_MARK
	74	case NFT_CT_MARK:
	75	dest->data[0] = ct->mark;
	76	return;
	77	#endif
	78	#ifdef CONFIG_NF_CONNTRACK_SECMARK
	79	case NFT_CT_SECMARK:
	80	dest->data[0] = ct->secmark;
	81	return;
	82	#endif
	83	case NFT_CT_EXPIRATION:
	84	diff = (long)jiffies - (long)ct->timeout.expires;
	85	if (diff < 0)
	86	diff = 0;
	87	dest->data[0] = jiffies_to_msecs(diff);
	88	return;
	89	case NFT_CT_HELPER:
	90	if (ct->master == NULL)
	91	goto err;
	92	help = nfct_help(ct->master);
	93	if (help == NULL)
	94	goto err;
	95	helper = rcu_dereference(help->helper);
	96	if (helper == NULL)
	97	goto err;
	98	if (strlen(helper->name) >= sizeof(dest->data))
	99	goto err;
	100	strncpy((char *)dest->data, helper->name, sizeof(dest->data));
	101	return;
d2bf2f34 FW	102	#ifdef CONFIG_NF_CONNTRACK_LABELS
	103	case NFT_CT_LABELS: {
	104	struct nf_conn_labels *labels = nf_ct_labels_find(ct);
	105	unsigned int size;
	106
	107	if (!labels) {
	108	memset(dest->data, 0, sizeof(dest->data));
	109	return;
	110	}
	111
	112	BUILD_BUG_ON(NF_CT_LABELS_MAX_SIZE > sizeof(dest->data));
	113	size = labels->words * sizeof(long);
	114
	115	memcpy(dest->data, labels->bits, size);
	116	if (size < sizeof(dest->data))
	117	memset(((char *) dest->data) + size, 0,
	118	sizeof(dest->data) - size);
	119	return;
	120	}
	121	#endif
c1f86676 DM	122	default:
c1f86676 DM	123	break;
96518518 PM	124	}
	125
	126	tuple = &ct->tuplehash[priv->dir].tuple;
	127	switch (priv->key) {
	128	case NFT_CT_L3PROTOCOL:
	129	dest->data[0] = nf_ct_l3num(ct);
	130	return;
	131	case NFT_CT_SRC:
	132	memcpy(dest->data, tuple->src.u3.all,
	133	nf_ct_l3num(ct) == NFPROTO_IPV4 ? 4 : 16);
	134	return;
	135	case NFT_CT_DST:
	136	memcpy(dest->data, tuple->dst.u3.all,
	137	nf_ct_l3num(ct) == NFPROTO_IPV4 ? 4 : 16);
	138	return;
	139	case NFT_CT_PROTOCOL:
	140	dest->data[0] = nf_ct_protonum(ct);
	141	return;
	142	case NFT_CT_PROTO_SRC:
	143	dest->data[0] = (__force __u16)tuple->src.u.all;
	144	return;
	145	case NFT_CT_PROTO_DST:
	146	dest->data[0] = (__force __u16)tuple->dst.u.all;
	147	return;
c1f86676 DM	148	default:
c1f86676 DM	149	break;
96518518 PM	150	}
	151	return;
	152	err:
	153	data[NFT_REG_VERDICT].verdict = NFT_BREAK;
	154	}
	155
c4ede3d3 KE	156	static void nft_ct_set_eval(const struct nft_expr *expr,
	157	struct nft_data data[NFT_REG_MAX + 1],
	158	const struct nft_pktinfo *pkt)
	159	{
	160	const struct nft_ct *priv = nft_expr_priv(expr);
	161	struct sk_buff *skb = pkt->skb;
847c8e29	162	#ifdef CONFIG_NF_CONNTRACK_MARK
c4ede3d3	163	u32 value = data[priv->sreg].data[0];
847c8e29	164	#endif
c4ede3d3 KE	165	enum ip_conntrack_info ctinfo;
	166	struct nf_conn *ct;
	167
	168	ct = nf_ct_get(skb, &ctinfo);
	169	if (ct == NULL)
	170	return;
	171
	172	switch (priv->key) {
	173	#ifdef CONFIG_NF_CONNTRACK_MARK
	174	case NFT_CT_MARK:
	175	if (ct->mark != value) {
	176	ct->mark = value;
	177	nf_conntrack_event_cache(IPCT_MARK, ct);
	178	}
	179	break;
	180	#endif
c1f86676 DM	181	default:
c1f86676 DM	182	break;
c4ede3d3 KE	183	}
	184	}
	185
96518518 PM	186	static const struct nla_policy nft_ct_policy[NFTA_CT_MAX + 1] = {
	187	[NFTA_CT_DREG] = { .type = NLA_U32 },
	188	[NFTA_CT_KEY] = { .type = NLA_U32 },
	189	[NFTA_CT_DIRECTION] = { .type = NLA_U8 },
c4ede3d3	190	[NFTA_CT_SREG] = { .type = NLA_U32 },
96518518 PM	191	};
96518518 PM	192
9638f33e PM	193	static int nft_ct_l3proto_try_module_get(uint8_t family)
	194	{
	195	int err;
	196
	197	if (family == NFPROTO_INET) {
	198	err = nf_ct_l3proto_try_module_get(NFPROTO_IPV4);
	199	if (err < 0)
	200	goto err1;
	201	err = nf_ct_l3proto_try_module_get(NFPROTO_IPV6);
	202	if (err < 0)
	203	goto err2;
	204	} else {
	205	err = nf_ct_l3proto_try_module_get(family);
	206	if (err < 0)
	207	goto err1;
	208	}
	209	return 0;
	210
	211	err2:
	212	nf_ct_l3proto_module_put(NFPROTO_IPV4);
	213	err1:
	214	return err;
	215	}
	216
	217	static void nft_ct_l3proto_module_put(uint8_t family)
	218	{
	219	if (family == NFPROTO_INET) {
	220	nf_ct_l3proto_module_put(NFPROTO_IPV4);
	221	nf_ct_l3proto_module_put(NFPROTO_IPV6);
	222	} else
	223	nf_ct_l3proto_module_put(family);
	224	}
	225
fe92ca45 PM	226	static int nft_ct_get_init(const struct nft_ctx *ctx,
	227	const struct nft_expr *expr,
	228	const struct nlattr * const tb[])
96518518 PM	229	{
96518518 PM	230	struct nft_ct *priv = nft_expr_priv(expr);
fe92ca45	231	int err;
96518518	232
fe92ca45	233	priv->key = ntohl(nla_get_be32(tb[NFTA_CT_KEY]));
96518518 PM	234	switch (priv->key) {
	235	case NFT_CT_STATE:
	236	case NFT_CT_DIRECTION:
	237	case NFT_CT_STATUS:
	238	#ifdef CONFIG_NF_CONNTRACK_MARK
	239	case NFT_CT_MARK:
	240	#endif
	241	#ifdef CONFIG_NF_CONNTRACK_SECMARK
	242	case NFT_CT_SECMARK:
d2bf2f34 FW	243	#endif
	244	#ifdef CONFIG_NF_CONNTRACK_LABELS
	245	case NFT_CT_LABELS:
96518518 PM	246	#endif
	247	case NFT_CT_EXPIRATION:
	248	case NFT_CT_HELPER:
	249	if (tb[NFTA_CT_DIRECTION] != NULL)
	250	return -EINVAL;
	251	break;
51292c07	252	case NFT_CT_L3PROTOCOL:
96518518 PM	253	case NFT_CT_PROTOCOL:
	254	case NFT_CT_SRC:
	255	case NFT_CT_DST:
	256	case NFT_CT_PROTO_SRC:
	257	case NFT_CT_PROTO_DST:
	258	if (tb[NFTA_CT_DIRECTION] == NULL)
	259	return -EINVAL;
	260	break;
	261	default:
	262	return -EOPNOTSUPP;
	263	}
	264
fe92ca45 PM	265	if (tb[NFTA_CT_DIRECTION] != NULL) {
	266	priv->dir = nla_get_u8(tb[NFTA_CT_DIRECTION]);
	267	switch (priv->dir) {
	268	case IP_CT_DIR_ORIGINAL:
	269	case IP_CT_DIR_REPLY:
	270	break;
	271	default:
	272	return -EINVAL;
	273	}
	274	}
	275
	276	priv->dreg = ntohl(nla_get_be32(tb[NFTA_CT_DREG]));
	277	err = nft_validate_output_register(priv->dreg);
	278	if (err < 0)
	279	return err;
	280
	281	err = nft_validate_data_load(ctx, priv->dreg, NULL, NFT_DATA_VALUE);
	282	if (err < 0)
	283	return err;
	284
	285	err = nft_ct_l3proto_try_module_get(ctx->afi->family);
	286	if (err < 0)
	287	return err;
	288
c4ede3d3 KE	289	return 0;
	290	}
	291
fe92ca45 PM	292	static int nft_ct_set_init(const struct nft_ctx *ctx,
	293	const struct nft_expr *expr,
	294	const struct nlattr * const tb[])
c4ede3d3	295	{
fe92ca45 PM	296	struct nft_ct *priv = nft_expr_priv(expr);
	297	int err;
	298
	299	priv->key = ntohl(nla_get_be32(tb[NFTA_CT_KEY]));
	300	switch (priv->key) {
e88e514e	301	#ifdef CONFIG_NF_CONNTRACK_MARK
c4ede3d3 KE	302	case NFT_CT_MARK:
c4ede3d3 KE	303	break;
e88e514e	304	#endif
c4ede3d3 KE	305	default:
	306	return -EOPNOTSUPP;
	307	}
	308
fe92ca45 PM	309	priv->sreg = ntohl(nla_get_be32(tb[NFTA_CT_SREG]));
	310	err = nft_validate_input_register(priv->sreg);
	311	if (err < 0)
	312	return err;
c4ede3d3	313
9638f33e	314	err = nft_ct_l3proto_try_module_get(ctx->afi->family);
96518518 PM	315	if (err < 0)
96518518 PM	316	return err;
96518518	317
96518518	318	return 0;
96518518 PM	319	}
96518518 PM	320
62472bce PM	321	static void nft_ct_destroy(const struct nft_ctx *ctx,
62472bce PM	322	const struct nft_expr *expr)
96518518	323	{
d46f2cd2	324	nft_ct_l3proto_module_put(ctx->afi->family);
96518518 PM	325	}
96518518 PM	326
c4ede3d3	327	static int nft_ct_get_dump(struct sk_buff skb, const struct nft_expr expr)
96518518 PM	328	{
	329	const struct nft_ct *priv = nft_expr_priv(expr);
	330
	331	if (nla_put_be32(skb, NFTA_CT_DREG, htonl(priv->dreg)))
	332	goto nla_put_failure;
	333	if (nla_put_be32(skb, NFTA_CT_KEY, htonl(priv->key)))
	334	goto nla_put_failure;
2a53bfb3 AB	335
	336	switch (priv->key) {
	337	case NFT_CT_PROTOCOL:
	338	case NFT_CT_SRC:
	339	case NFT_CT_DST:
	340	case NFT_CT_PROTO_SRC:
	341	case NFT_CT_PROTO_DST:
	342	if (nla_put_u8(skb, NFTA_CT_DIRECTION, priv->dir))
	343	goto nla_put_failure;
	344	default:
	345	break;
	346	}
	347
96518518 PM	348	return 0;
	349
	350	nla_put_failure:
	351	return -1;
	352	}
	353
c4ede3d3 KE	354	static int nft_ct_set_dump(struct sk_buff skb, const struct nft_expr expr)
	355	{
	356	const struct nft_ct *priv = nft_expr_priv(expr);
	357
	358	if (nla_put_be32(skb, NFTA_CT_SREG, htonl(priv->sreg)))
	359	goto nla_put_failure;
	360	if (nla_put_be32(skb, NFTA_CT_KEY, htonl(priv->key)))
	361	goto nla_put_failure;
	362	return 0;
	363
	364	nla_put_failure:
	365	return -1;
	366	}
	367
ef1f7df9	368	static struct nft_expr_type nft_ct_type;
c4ede3d3	369	static const struct nft_expr_ops nft_ct_get_ops = {
ef1f7df9	370	.type = &nft_ct_type,
96518518	371	.size = NFT_EXPR_SIZE(sizeof(struct nft_ct)),
c4ede3d3	372	.eval = nft_ct_get_eval,
fe92ca45	373	.init = nft_ct_get_init,
96518518	374	.destroy = nft_ct_destroy,
c4ede3d3	375	.dump = nft_ct_get_dump,
ef1f7df9 PM	376	};
ef1f7df9 PM	377
c4ede3d3 KE	378	static const struct nft_expr_ops nft_ct_set_ops = {
	379	.type = &nft_ct_type,
	380	.size = NFT_EXPR_SIZE(sizeof(struct nft_ct)),
	381	.eval = nft_ct_set_eval,
fe92ca45	382	.init = nft_ct_set_init,
c4ede3d3 KE	383	.destroy = nft_ct_destroy,
	384	.dump = nft_ct_set_dump,
	385	};
	386
	387	static const struct nft_expr_ops *
	388	nft_ct_select_ops(const struct nft_ctx *ctx,
	389	const struct nlattr * const tb[])
	390	{
	391	if (tb[NFTA_CT_KEY] == NULL)
	392	return ERR_PTR(-EINVAL);
	393
	394	if (tb[NFTA_CT_DREG] && tb[NFTA_CT_SREG])
	395	return ERR_PTR(-EINVAL);
	396
	397	if (tb[NFTA_CT_DREG])
	398	return &nft_ct_get_ops;
	399
	400	if (tb[NFTA_CT_SREG])
	401	return &nft_ct_set_ops;
	402
	403	return ERR_PTR(-EINVAL);
	404	}
	405
ef1f7df9 PM	406	static struct nft_expr_type nft_ct_type __read_mostly = {
ef1f7df9 PM	407	.name = "ct",
c4ede3d3	408	.select_ops = &nft_ct_select_ops,
96518518 PM	409	.policy = nft_ct_policy,
96518518 PM	410	.maxattr = NFTA_CT_MAX,
ef1f7df9	411	.owner = THIS_MODULE,
96518518 PM	412	};
	413
	414	static int __init nft_ct_module_init(void)
	415	{
ef1f7df9	416	return nft_register_expr(&nft_ct_type);
96518518 PM	417	}
	418
	419	static void __exit nft_ct_module_exit(void)
	420	{
ef1f7df9	421	nft_unregister_expr(&nft_ct_type);
96518518 PM	422	}
	423
	424	module_init(nft_ct_module_init);
	425	module_exit(nft_ct_module_exit);
	426
	427	MODULE_LICENSE("GPL");
	428	MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
	429	MODULE_ALIAS_NFT_EXPR("ct");