[mirror_ubuntu-artful-kernel.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;
	}

	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
	}

	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;
	}
	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
	}
}

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