[linux-block.git] / net / netfilter / nft_dynset.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2015 Patrick McHardy <kaber@trash.net>
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.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_tables_core.h>

struct nft_dynset {
	struct nft_set			*set;
	struct nft_set_ext_tmpl		tmpl;
	enum nft_dynset_ops		op:8;
	u8				sreg_key;
	u8				sreg_data;
	bool				invert;
	bool				expr;
	u8				num_exprs;
	u64				timeout;
	struct nft_expr			*expr_array[NFT_SET_EXPR_MAX];
	struct nft_set_binding		binding;
};

static int nft_dynset_expr_setup(const struct nft_dynset *priv,
				 const struct nft_set_ext *ext)
{
	struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
	struct nft_expr *expr;
	int i;

	for (i = 0; i < priv->num_exprs; i++) {
		expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
		if (nft_expr_clone(expr, priv->expr_array[i]) < 0)
			return -1;

		elem_expr->size += priv->expr_array[i]->ops->size;
	}

	return 0;
}

static struct nft_elem_priv *nft_dynset_new(struct nft_set *set,
					    const struct nft_expr *expr,
					    struct nft_regs *regs)
{
	const struct nft_dynset *priv = nft_expr_priv(expr);
	struct nft_set_ext *ext;
	void *elem_priv;
	u64 timeout;

	if (!atomic_add_unless(&set->nelems, 1, set->size))
		return NULL;

	timeout = priv->timeout ? : set->timeout;
	elem_priv = nft_set_elem_init(set, &priv->tmpl,
				      &regs->data[priv->sreg_key], NULL,
				      &regs->data[priv->sreg_data],
				      timeout, 0, GFP_ATOMIC);
	if (IS_ERR(elem_priv))
		goto err1;

	ext = nft_set_elem_ext(set, elem_priv);
	if (priv->num_exprs && nft_dynset_expr_setup(priv, ext) < 0)
		goto err2;

	return elem_priv;

err2:
	nft_set_elem_destroy(set, elem_priv, false);
err1:
	if (set->size)
		atomic_dec(&set->nelems);
	return NULL;
}

void nft_dynset_eval(const struct nft_expr *expr,
		     struct nft_regs *regs, const struct nft_pktinfo *pkt)
{
	const struct nft_dynset *priv = nft_expr_priv(expr);
	struct nft_set *set = priv->set;
	const struct nft_set_ext *ext;
	u64 timeout;

	if (priv->op == NFT_DYNSET_OP_DELETE) {
		set->ops->delete(set, &regs->data[priv->sreg_key]);
		return;
	}

	if (set->ops->update(set, &regs->data[priv->sreg_key], nft_dynset_new,
			     expr, regs, &ext)) {
		if (priv->op == NFT_DYNSET_OP_UPDATE &&
		    nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
			timeout = priv->timeout ? : set->timeout;
			*nft_set_ext_expiration(ext) = get_jiffies_64() + timeout;
		}

		nft_set_elem_update_expr(ext, regs, pkt);

		if (priv->invert)
			regs->verdict.code = NFT_BREAK;
		return;
	}

	if (!priv->invert)
		regs->verdict.code = NFT_BREAK;
}

static void nft_dynset_ext_add_expr(struct nft_dynset *priv)
{
	u8 size = 0;
	int i;

	for (i = 0; i < priv->num_exprs; i++)
		size += priv->expr_array[i]->ops->size;

	nft_set_ext_add_length(&priv->tmpl, NFT_SET_EXT_EXPRESSIONS,
			       sizeof(struct nft_set_elem_expr) + size);
}

static struct nft_expr *
nft_dynset_expr_alloc(const struct nft_ctx *ctx, const struct nft_set *set,
		      const struct nlattr *attr, int pos)
{
	struct nft_expr *expr;
	int err;

	expr = nft_set_elem_expr_alloc(ctx, set, attr);
	if (IS_ERR(expr))
		return expr;

	if (set->exprs[pos] && set->exprs[pos]->ops != expr->ops) {
		err = -EOPNOTSUPP;
		goto err_dynset_expr;
	}

	return expr;

err_dynset_expr:
	nft_expr_destroy(ctx, expr);
	return ERR_PTR(err);
}

static const struct nla_policy nft_dynset_policy[NFTA_DYNSET_MAX + 1] = {
	[NFTA_DYNSET_SET_NAME]	= { .type = NLA_STRING,
				    .len = NFT_SET_MAXNAMELEN - 1 },
	[NFTA_DYNSET_SET_ID]	= { .type = NLA_U32 },
	[NFTA_DYNSET_OP]	= NLA_POLICY_MAX(NLA_BE32, 255),
	[NFTA_DYNSET_SREG_KEY]	= { .type = NLA_U32 },
	[NFTA_DYNSET_SREG_DATA]	= { .type = NLA_U32 },
	[NFTA_DYNSET_TIMEOUT]	= { .type = NLA_U64 },
	[NFTA_DYNSET_EXPR]	= { .type = NLA_NESTED },
	[NFTA_DYNSET_FLAGS]	= { .type = NLA_U32 },
	[NFTA_DYNSET_EXPRESSIONS] = { .type = NLA_NESTED },
};

static int nft_dynset_init(const struct nft_ctx *ctx,
			   const struct nft_expr *expr,
			   const struct nlattr * const tb[])
{
	struct nftables_pernet *nft_net = nft_pernet(ctx->net);
	struct nft_dynset *priv = nft_expr_priv(expr);
	u8 genmask = nft_genmask_next(ctx->net);
	struct nft_set *set;
	u64 timeout;
	int err, i;

	lockdep_assert_held(&nft_net->commit_mutex);

	if (tb[NFTA_DYNSET_SET_NAME] == NULL ||
	    tb[NFTA_DYNSET_OP] == NULL ||
	    tb[NFTA_DYNSET_SREG_KEY] == NULL)
		return -EINVAL;

	if (tb[NFTA_DYNSET_FLAGS]) {
		u32 flags = ntohl(nla_get_be32(tb[NFTA_DYNSET_FLAGS]));
		if (flags & ~(NFT_DYNSET_F_INV | NFT_DYNSET_F_EXPR))
			return -EOPNOTSUPP;
		if (flags & NFT_DYNSET_F_INV)
			priv->invert = true;
		if (flags & NFT_DYNSET_F_EXPR)
			priv->expr = true;
	}

	set = nft_set_lookup_global(ctx->net, ctx->table,
				    tb[NFTA_DYNSET_SET_NAME],
				    tb[NFTA_DYNSET_SET_ID], genmask);
	if (IS_ERR(set))
		return PTR_ERR(set);

	if (set->flags & NFT_SET_OBJECT)
		return -EOPNOTSUPP;

	if (set->ops->update == NULL)
		return -EOPNOTSUPP;

	if (set->flags & NFT_SET_CONSTANT)
		return -EBUSY;

	priv->op = ntohl(nla_get_be32(tb[NFTA_DYNSET_OP]));
	if (priv->op > NFT_DYNSET_OP_DELETE)
		return -EOPNOTSUPP;

	timeout = 0;
	if (tb[NFTA_DYNSET_TIMEOUT] != NULL) {
		if (!(set->flags & NFT_SET_TIMEOUT))
			return -EOPNOTSUPP;

		err = nf_msecs_to_jiffies64(tb[NFTA_DYNSET_TIMEOUT], &timeout);
		if (err)
			return err;
	}

	err = nft_parse_register_load(tb[NFTA_DYNSET_SREG_KEY], &priv->sreg_key,
				      set->klen);
	if (err < 0)
		return err;

	if (tb[NFTA_DYNSET_SREG_DATA] != NULL) {
		if (!(set->flags & NFT_SET_MAP))
			return -EOPNOTSUPP;
		if (set->dtype == NFT_DATA_VERDICT)
			return -EOPNOTSUPP;

		err = nft_parse_register_load(tb[NFTA_DYNSET_SREG_DATA],
					      &priv->sreg_data, set->dlen);
		if (err < 0)
			return err;
	} else if (set->flags & NFT_SET_MAP)
		return -EINVAL;

	if ((tb[NFTA_DYNSET_EXPR] || tb[NFTA_DYNSET_EXPRESSIONS]) &&
	    !(set->flags & NFT_SET_EVAL))
		return -EINVAL;

	if (tb[NFTA_DYNSET_EXPR]) {
		struct nft_expr *dynset_expr;

		dynset_expr = nft_dynset_expr_alloc(ctx, set,
						    tb[NFTA_DYNSET_EXPR], 0);
		if (IS_ERR(dynset_expr))
			return PTR_ERR(dynset_expr);

		priv->num_exprs++;
		priv->expr_array[0] = dynset_expr;

		if (set->num_exprs > 1 ||
		    (set->num_exprs == 1 &&
		     dynset_expr->ops != set->exprs[0]->ops)) {
			err = -EOPNOTSUPP;
			goto err_expr_free;
		}
	} else if (tb[NFTA_DYNSET_EXPRESSIONS]) {
		struct nft_expr *dynset_expr;
		struct nlattr *tmp;
		int left;

		if (!priv->expr)
			return -EINVAL;

		i = 0;
		nla_for_each_nested(tmp, tb[NFTA_DYNSET_EXPRESSIONS], left) {
			if (i == NFT_SET_EXPR_MAX) {
				err = -E2BIG;
				goto err_expr_free;
			}
			if (nla_type(tmp) != NFTA_LIST_ELEM) {
				err = -EINVAL;
				goto err_expr_free;
			}
			dynset_expr = nft_dynset_expr_alloc(ctx, set, tmp, i);
			if (IS_ERR(dynset_expr)) {
				err = PTR_ERR(dynset_expr);
				goto err_expr_free;
			}
			priv->expr_array[i] = dynset_expr;
			priv->num_exprs++;

			if (set->num_exprs &&
			    dynset_expr->ops != set->exprs[i]->ops) {
				err = -EOPNOTSUPP;
				goto err_expr_free;
			}
			i++;
		}
		if (set->num_exprs && set->num_exprs != i) {
			err = -EOPNOTSUPP;
			goto err_expr_free;
		}
	} else if (set->num_exprs > 0) {
		err = nft_set_elem_expr_clone(ctx, set, priv->expr_array);
		if (err < 0)
			return err;

		priv->num_exprs = set->num_exprs;
	}

	nft_set_ext_prepare(&priv->tmpl);
	nft_set_ext_add_length(&priv->tmpl, NFT_SET_EXT_KEY, set->klen);
	if (set->flags & NFT_SET_MAP)
		nft_set_ext_add_length(&priv->tmpl, NFT_SET_EXT_DATA, set->dlen);

	if (priv->num_exprs)
		nft_dynset_ext_add_expr(priv);

	if (set->flags & NFT_SET_TIMEOUT) {
		if (timeout || set->timeout) {
			nft_set_ext_add(&priv->tmpl, NFT_SET_EXT_TIMEOUT);
			nft_set_ext_add(&priv->tmpl, NFT_SET_EXT_EXPIRATION);
		}
	}

	priv->timeout = timeout;

	err = nf_tables_bind_set(ctx, set, &priv->binding);
	if (err < 0)
		goto err_expr_free;

	if (set->size == 0)
		set->size = 0xffff;

	priv->set = set;
	return 0;

err_expr_free:
	for (i = 0; i < priv->num_exprs; i++)
		nft_expr_destroy(ctx, priv->expr_array[i]);
	return err;
}

static void nft_dynset_deactivate(const struct nft_ctx *ctx,
				  const struct nft_expr *expr,
				  enum nft_trans_phase phase)
{
	struct nft_dynset *priv = nft_expr_priv(expr);

	nf_tables_deactivate_set(ctx, priv->set, &priv->binding, phase);
}

static void nft_dynset_activate(const struct nft_ctx *ctx,
				const struct nft_expr *expr)
{
	struct nft_dynset *priv = nft_expr_priv(expr);

	nf_tables_activate_set(ctx, priv->set);
}

static void nft_dynset_destroy(const struct nft_ctx *ctx,
			       const struct nft_expr *expr)
{
	struct nft_dynset *priv = nft_expr_priv(expr);
	int i;

	for (i = 0; i < priv->num_exprs; i++)
		nft_expr_destroy(ctx, priv->expr_array[i]);

	nf_tables_destroy_set(ctx, priv->set);
}

static int nft_dynset_dump(struct sk_buff *skb,
			   const struct nft_expr *expr, bool reset)
{
	const struct nft_dynset *priv = nft_expr_priv(expr);
	u32 flags = priv->invert ? NFT_DYNSET_F_INV : 0;
	int i;

	if (nft_dump_register(skb, NFTA_DYNSET_SREG_KEY, priv->sreg_key))
		goto nla_put_failure;
	if (priv->set->flags & NFT_SET_MAP &&
	    nft_dump_register(skb, NFTA_DYNSET_SREG_DATA, priv->sreg_data))
		goto nla_put_failure;
	if (nla_put_be32(skb, NFTA_DYNSET_OP, htonl(priv->op)))
		goto nla_put_failure;
	if (nla_put_string(skb, NFTA_DYNSET_SET_NAME, priv->set->name))
		goto nla_put_failure;
	if (nla_put_be64(skb, NFTA_DYNSET_TIMEOUT,
			 nf_jiffies64_to_msecs(priv->timeout),
			 NFTA_DYNSET_PAD))
		goto nla_put_failure;
	if (priv->set->num_exprs == 0) {
		if (priv->num_exprs == 1) {
			if (nft_expr_dump(skb, NFTA_DYNSET_EXPR,
					  priv->expr_array[0], reset))
				goto nla_put_failure;
		} else if (priv->num_exprs > 1) {
			struct nlattr *nest;

			nest = nla_nest_start_noflag(skb, NFTA_DYNSET_EXPRESSIONS);
			if (!nest)
				goto nla_put_failure;

			for (i = 0; i < priv->num_exprs; i++) {
				if (nft_expr_dump(skb, NFTA_LIST_ELEM,
						  priv->expr_array[i], reset))
					goto nla_put_failure;
			}
			nla_nest_end(skb, nest);
		}
	}
	if (nla_put_be32(skb, NFTA_DYNSET_FLAGS, htonl(flags)))
		goto nla_put_failure;
	return 0;

nla_put_failure:
	return -1;
}

static const struct nft_expr_ops nft_dynset_ops = {
	.type		= &nft_dynset_type,
	.size		= NFT_EXPR_SIZE(sizeof(struct nft_dynset)),
	.eval		= nft_dynset_eval,
	.init		= nft_dynset_init,
	.destroy	= nft_dynset_destroy,
	.activate	= nft_dynset_activate,
	.deactivate	= nft_dynset_deactivate,
	.dump		= nft_dynset_dump,
	.reduce		= NFT_REDUCE_READONLY,
};

struct nft_expr_type nft_dynset_type __read_mostly = {
	.name		= "dynset",
	.ops		= &nft_dynset_ops,
	.policy		= nft_dynset_policy,
	.maxattr	= NFTA_DYNSET_MAX,
	.owner		= THIS_MODULE,
};
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
22fe54d5 PM	2	/*
22fe54d5 PM	3	* Copyright (c) 2015 Patrick McHardy <kaber@trash.net>
22fe54d5 PM	4	*/
	5
	6	#include <linux/kernel.h>
	7	#include <linux/module.h>
	8	#include <linux/init.h>
	9	#include <linux/netlink.h>
	10	#include <linux/netfilter.h>
	11	#include <linux/netfilter/nf_tables.h>
	12	#include <net/netfilter/nf_tables.h>
	13	#include <net/netfilter/nf_tables_core.h>
	14
	15	struct nft_dynset {
	16	struct nft_set *set;
	17	struct nft_set_ext_tmpl tmpl;
	18	enum nft_dynset_ops op:8;
4f16d25c PNA	19	u8 sreg_key;
4f16d25c PNA	20	u8 sreg_data;
dbd2be06	21	bool invert;
b4e70d8d	22	bool expr;
563125a7	23	u8 num_exprs;
22fe54d5	24	u64 timeout;
563125a7	25	struct nft_expr *expr_array[NFT_SET_EXPR_MAX];
22fe54d5 PM	26	struct nft_set_binding binding;
	27	};
	28
563125a7 PNA	29	static int nft_dynset_expr_setup(const struct nft_dynset *priv,
	30	const struct nft_set_ext *ext)
	31	{
	32	struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
	33	struct nft_expr *expr;
	34	int i;
	35
	36	for (i = 0; i < priv->num_exprs; i++) {
	37	expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
	38	if (nft_expr_clone(expr, priv->expr_array[i]) < 0)
	39	return -1;
	40
	41	elem_expr->size += priv->expr_array[i]->ops->size;
	42	}
	43
	44	return 0;
	45	}
	46
9dad402b PNA	47	static struct nft_elem_priv nft_dynset_new(struct nft_set set,
	48	const struct nft_expr *expr,
	49	struct nft_regs *regs)
22fe54d5 PM	50	{
22fe54d5 PM	51	const struct nft_dynset *priv = nft_expr_priv(expr);
3e135cd4	52	struct nft_set_ext *ext;
9dad402b	53	void *elem_priv;
22fe54d5	54	u64 timeout;
22fe54d5	55
99a0efbe	56	if (!atomic_add_unless(&set->nelems, 1, set->size))
22fe54d5 PM	57	return NULL;
	58
	59	timeout = priv->timeout ? : set->timeout;
9dad402b PNA	60	elem_priv = nft_set_elem_init(set, &priv->tmpl,
	61	&regs->data[priv->sreg_key], NULL,
	62	&regs->data[priv->sreg_data],
	63	timeout, 0, GFP_ATOMIC);
	64	if (IS_ERR(elem_priv))
61f9e292	65	goto err1;
3e135cd4	66
9dad402b	67	ext = nft_set_elem_ext(set, elem_priv);
563125a7	68	if (priv->num_exprs && nft_dynset_expr_setup(priv, ext) < 0)
61f9e292	69	goto err2;
3e135cd4	70
9dad402b	71	return elem_priv;
61f9e292 LZ	72
61f9e292 LZ	73	err2:
9dad402b	74	nft_set_elem_destroy(set, elem_priv, false);
61f9e292 LZ	75	err1:
	76	if (set->size)
	77	atomic_dec(&set->nelems);
	78	return NULL;
22fe54d5 PM	79	}
22fe54d5 PM	80
10870dd8 FW	81	void nft_dynset_eval(const struct nft_expr *expr,
10870dd8 FW	82	struct nft_regs regs, const struct nft_pktinfo pkt)
22fe54d5 PM	83	{
	84	const struct nft_dynset *priv = nft_expr_priv(expr);
	85	struct nft_set *set = priv->set;
	86	const struct nft_set_ext *ext;
	87	u64 timeout;
	88
d0a8d877 AJ	89	if (priv->op == NFT_DYNSET_OP_DELETE) {
	90	set->ops->delete(set, &regs->data[priv->sreg_key]);
	91	return;
	92	}
	93
a55e22e9 PM	94	if (set->ops->update(set, &regs->data[priv->sreg_key], nft_dynset_new,
a55e22e9 PM	95	expr, regs, &ext)) {
22fe54d5 PM	96	if (priv->op == NFT_DYNSET_OP_UPDATE &&
	97	nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
	98	timeout = priv->timeout ? : set->timeout;
b13468dc	99	*nft_set_ext_expiration(ext) = get_jiffies_64() + timeout;
277a2928	100	}
22fe54d5	101
76adfafe	102	nft_set_elem_update_expr(ext, regs, pkt);
dbd2be06 PNA	103
	104	if (priv->invert)
	105	regs->verdict.code = NFT_BREAK;
3e135cd4 PM	106	return;
3e135cd4 PM	107	}
277a2928	108
dbd2be06 PNA	109	if (!priv->invert)
dbd2be06 PNA	110	regs->verdict.code = NFT_BREAK;
22fe54d5 PM	111	}
22fe54d5 PM	112
563125a7 PNA	113	static void nft_dynset_ext_add_expr(struct nft_dynset *priv)
	114	{
	115	u8 size = 0;
	116	int i;
	117
	118	for (i = 0; i < priv->num_exprs; i++)
	119	size += priv->expr_array[i]->ops->size;
	120
	121	nft_set_ext_add_length(&priv->tmpl, NFT_SET_EXT_EXPRESSIONS,
	122	sizeof(struct nft_set_elem_expr) + size);
	123	}
	124
	125	static struct nft_expr *
	126	nft_dynset_expr_alloc(const struct nft_ctx ctx, const struct nft_set set,
	127	const struct nlattr *attr, int pos)
	128	{
	129	struct nft_expr *expr;
	130	int err;
	131
	132	expr = nft_set_elem_expr_alloc(ctx, set, attr);
	133	if (IS_ERR(expr))
	134	return expr;
	135
	136	if (set->exprs[pos] && set->exprs[pos]->ops != expr->ops) {
	137	err = -EOPNOTSUPP;
	138	goto err_dynset_expr;
	139	}
	140
	141	return expr;
	142
	143	err_dynset_expr:
	144	nft_expr_destroy(ctx, expr);
	145	return ERR_PTR(err);
	146	}
	147
22fe54d5	148	static const struct nla_policy nft_dynset_policy[NFTA_DYNSET_MAX + 1] = {
b2fbd044 LZ	149	[NFTA_DYNSET_SET_NAME] = { .type = NLA_STRING,
b2fbd044 LZ	150	.len = NFT_SET_MAXNAMELEN - 1 },
22fe54d5	151	[NFTA_DYNSET_SET_ID] = { .type = NLA_U32 },
a412dbf4	152	[NFTA_DYNSET_OP] = NLA_POLICY_MAX(NLA_BE32, 255),
22fe54d5 PM	153	[NFTA_DYNSET_SREG_KEY] = { .type = NLA_U32 },
	154	[NFTA_DYNSET_SREG_DATA] = { .type = NLA_U32 },
	155	[NFTA_DYNSET_TIMEOUT] = { .type = NLA_U64 },
3e135cd4	156	[NFTA_DYNSET_EXPR] = { .type = NLA_NESTED },
dbd2be06	157	[NFTA_DYNSET_FLAGS] = { .type = NLA_U32 },
48b0ae04	158	[NFTA_DYNSET_EXPRESSIONS] = { .type = NLA_NESTED },
22fe54d5 PM	159	};
	160
	161	static int nft_dynset_init(const struct nft_ctx *ctx,
	162	const struct nft_expr *expr,
	163	const struct nlattr * const tb[])
	164	{
d59d2f82	165	struct nftables_pernet *nft_net = nft_pernet(ctx->net);
22fe54d5	166	struct nft_dynset *priv = nft_expr_priv(expr);
37a9cc52	167	u8 genmask = nft_genmask_next(ctx->net);
22fe54d5 PM	168	struct nft_set *set;
22fe54d5 PM	169	u64 timeout;
563125a7	170	int err, i;
22fe54d5	171
0854db2a	172	lockdep_assert_held(&nft_net->commit_mutex);
f102d66b	173
22fe54d5 PM	174	if (tb[NFTA_DYNSET_SET_NAME] == NULL \|\|
	175	tb[NFTA_DYNSET_OP] == NULL \|\|
	176	tb[NFTA_DYNSET_SREG_KEY] == NULL)
	177	return -EINVAL;
	178
dbd2be06 PNA	179	if (tb[NFTA_DYNSET_FLAGS]) {
dbd2be06 PNA	180	u32 flags = ntohl(nla_get_be32(tb[NFTA_DYNSET_FLAGS]));
b4e70d8d	181	if (flags & ~(NFT_DYNSET_F_INV \| NFT_DYNSET_F_EXPR))
95cd4bca	182	return -EOPNOTSUPP;
dbd2be06 PNA	183	if (flags & NFT_DYNSET_F_INV)
dbd2be06 PNA	184	priv->invert = true;
b4e70d8d PNA	185	if (flags & NFT_DYNSET_F_EXPR)
b4e70d8d PNA	186	priv->expr = true;
dbd2be06 PNA	187	}
dbd2be06 PNA	188
10659cba PNA	189	set = nft_set_lookup_global(ctx->net, ctx->table,
	190	tb[NFTA_DYNSET_SET_NAME],
	191	tb[NFTA_DYNSET_SET_ID], genmask);
c7a72e3f PNA	192	if (IS_ERR(set))
c7a72e3f PNA	193	return PTR_ERR(set);
22fe54d5	194
23185c6a PNA	195	if (set->flags & NFT_SET_OBJECT)
	196	return -EOPNOTSUPP;
	197
bb6a6e8e LZ	198	if (set->ops->update == NULL)
	199	return -EOPNOTSUPP;
	200
22fe54d5 PM	201	if (set->flags & NFT_SET_CONSTANT)
	202	return -EBUSY;
	203
	204	priv->op = ntohl(nla_get_be32(tb[NFTA_DYNSET_OP]));
7b139489	205	if (priv->op > NFT_DYNSET_OP_DELETE)
22fe54d5	206	return -EOPNOTSUPP;
22fe54d5 PM	207
	208	timeout = 0;
	209	if (tb[NFTA_DYNSET_TIMEOUT] != NULL) {
	210	if (!(set->flags & NFT_SET_TIMEOUT))
95cd4bca	211	return -EOPNOTSUPP;
917d80d3 PNA	212
	213	err = nf_msecs_to_jiffies64(tb[NFTA_DYNSET_TIMEOUT], &timeout);
	214	if (err)
	215	return err;
22fe54d5 PM	216	}
22fe54d5 PM	217
4f16d25c PNA	218	err = nft_parse_register_load(tb[NFTA_DYNSET_SREG_KEY], &priv->sreg_key,
4f16d25c PNA	219	set->klen);
22fe54d5 PM	220	if (err < 0)
	221	return err;
	222
	223	if (tb[NFTA_DYNSET_SREG_DATA] != NULL) {
	224	if (!(set->flags & NFT_SET_MAP))
95cd4bca	225	return -EOPNOTSUPP;
22fe54d5 PM	226	if (set->dtype == NFT_DATA_VERDICT)
	227	return -EOPNOTSUPP;
	228
4f16d25c PNA	229	err = nft_parse_register_load(tb[NFTA_DYNSET_SREG_DATA],
4f16d25c PNA	230	&priv->sreg_data, set->dlen);
22fe54d5 PM	231	if (err < 0)
	232	return err;
	233	} else if (set->flags & NFT_SET_MAP)
	234	return -EINVAL;
	235
48b0ae04 PNA	236	if ((tb[NFTA_DYNSET_EXPR] \|\| tb[NFTA_DYNSET_EXPRESSIONS]) &&
	237	!(set->flags & NFT_SET_EVAL))
	238	return -EINVAL;
	239
563125a7 PNA	240	if (tb[NFTA_DYNSET_EXPR]) {
	241	struct nft_expr *dynset_expr;
	242
563125a7 PNA	243	dynset_expr = nft_dynset_expr_alloc(ctx, set,
	244	tb[NFTA_DYNSET_EXPR], 0);
	245	if (IS_ERR(dynset_expr))
	246	return PTR_ERR(dynset_expr);
3e135cd4	247
563125a7 PNA	248	priv->num_exprs++;
563125a7 PNA	249	priv->expr_array[0] = dynset_expr;
8548bde9	250
563125a7 PNA	251	if (set->num_exprs > 1 \|\|
	252	(set->num_exprs == 1 &&
	253	dynset_expr->ops != set->exprs[0]->ops)) {
8548bde9 PNA	254	err = -EOPNOTSUPP;
	255	goto err_expr_free;
	256	}
48b0ae04 PNA	257	} else if (tb[NFTA_DYNSET_EXPRESSIONS]) {
	258	struct nft_expr *dynset_expr;
	259	struct nlattr *tmp;
	260	int left;
	261
b4e70d8d PNA	262	if (!priv->expr)
	263	return -EINVAL;
	264
48b0ae04 PNA	265	i = 0;
	266	nla_for_each_nested(tmp, tb[NFTA_DYNSET_EXPRESSIONS], left) {
	267	if (i == NFT_SET_EXPR_MAX) {
	268	err = -E2BIG;
	269	goto err_expr_free;
	270	}
	271	if (nla_type(tmp) != NFTA_LIST_ELEM) {
	272	err = -EINVAL;
	273	goto err_expr_free;
	274	}
	275	dynset_expr = nft_dynset_expr_alloc(ctx, set, tmp, i);
	276	if (IS_ERR(dynset_expr)) {
	277	err = PTR_ERR(dynset_expr);
	278	goto err_expr_free;
	279	}
	280	priv->expr_array[i] = dynset_expr;
	281	priv->num_exprs++;
	282
	283	if (set->num_exprs &&
	284	dynset_expr->ops != set->exprs[i]->ops) {
	285	err = -EOPNOTSUPP;
	286	goto err_expr_free;
	287	}
	288	i++;
	289	}
	290	if (set->num_exprs && set->num_exprs != i) {
8548bde9 PNA	291	err = -EOPNOTSUPP;
	292	goto err_expr_free;
	293	}
fca05d4d PNA	294	} else if (set->num_exprs > 0) {
	295	err = nft_set_elem_expr_clone(ctx, set, priv->expr_array);
	296	if (err < 0)
	297	return err;
	298
	299	priv->num_exprs = set->num_exprs;
215a31f1	300	}
3e135cd4	301
22fe54d5 PM	302	nft_set_ext_prepare(&priv->tmpl);
	303	nft_set_ext_add_length(&priv->tmpl, NFT_SET_EXT_KEY, set->klen);
	304	if (set->flags & NFT_SET_MAP)
	305	nft_set_ext_add_length(&priv->tmpl, NFT_SET_EXT_DATA, set->dlen);
563125a7 PNA	306
	307	if (priv->num_exprs)
	308	nft_dynset_ext_add_expr(priv);
	309
22fe54d5	310	if (set->flags & NFT_SET_TIMEOUT) {
0c5b7a50 PNA	311	if (timeout \|\| set->timeout) {
0c5b7a50 PNA	312	nft_set_ext_add(&priv->tmpl, NFT_SET_EXT_TIMEOUT);
22fe54d5	313	nft_set_ext_add(&priv->tmpl, NFT_SET_EXT_EXPIRATION);
0c5b7a50	314	}
22fe54d5 PM	315	}
	316
	317	priv->timeout = timeout;
	318
	319	err = nf_tables_bind_set(ctx, set, &priv->binding);
	320	if (err < 0)
8548bde9	321	goto err_expr_free;
22fe54d5	322
99a0efbe FW	323	if (set->size == 0)
	324	set->size = 0xffff;
	325
22fe54d5 PM	326	priv->set = set;
22fe54d5 PM	327	return 0;
3e135cd4	328
8548bde9	329	err_expr_free:
563125a7 PNA	330	for (i = 0; i < priv->num_exprs; i++)
563125a7 PNA	331	nft_expr_destroy(ctx, priv->expr_array[i]);
3e135cd4	332	return err;
22fe54d5 PM	333	}
22fe54d5 PM	334
cd5125d8	335	static void nft_dynset_deactivate(const struct nft_ctx *ctx,
f6ac8585 PNA	336	const struct nft_expr *expr,
f6ac8585 PNA	337	enum nft_trans_phase phase)
cd5125d8 FW	338	{
	339	struct nft_dynset *priv = nft_expr_priv(expr);
	340
273fe3f1 PNA	341	nf_tables_deactivate_set(ctx, priv->set, &priv->binding, phase);
	342	}
	343
	344	static void nft_dynset_activate(const struct nft_ctx *ctx,
	345	const struct nft_expr *expr)
	346	{
	347	struct nft_dynset *priv = nft_expr_priv(expr);
f6ac8585	348
c1592a89	349	nf_tables_activate_set(ctx, priv->set);
cd5125d8 FW	350	}
cd5125d8 FW	351
22fe54d5 PM	352	static void nft_dynset_destroy(const struct nft_ctx *ctx,
	353	const struct nft_expr *expr)
	354	{
	355	struct nft_dynset *priv = nft_expr_priv(expr);
563125a7	356	int i;
22fe54d5	357
563125a7 PNA	358	for (i = 0; i < priv->num_exprs; i++)
563125a7 PNA	359	nft_expr_destroy(ctx, priv->expr_array[i]);
cd5125d8 FW	360
cd5125d8 FW	361	nf_tables_destroy_set(ctx, priv->set);
22fe54d5 PM	362	}
22fe54d5 PM	363
7d34aa3e PS	364	static int nft_dynset_dump(struct sk_buff *skb,
7d34aa3e PS	365	const struct nft_expr *expr, bool reset)
22fe54d5 PM	366	{
22fe54d5 PM	367	const struct nft_dynset *priv = nft_expr_priv(expr);
dbd2be06	368	u32 flags = priv->invert ? NFT_DYNSET_F_INV : 0;
48b0ae04	369	int i;
22fe54d5	370
b1c96ed3	371	if (nft_dump_register(skb, NFTA_DYNSET_SREG_KEY, priv->sreg_key))
22fe54d5 PM	372	goto nla_put_failure;
22fe54d5 PM	373	if (priv->set->flags & NFT_SET_MAP &&
b1c96ed3	374	nft_dump_register(skb, NFTA_DYNSET_SREG_DATA, priv->sreg_data))
22fe54d5 PM	375	goto nla_put_failure;
	376	if (nla_put_be32(skb, NFTA_DYNSET_OP, htonl(priv->op)))
	377	goto nla_put_failure;
	378	if (nla_put_string(skb, NFTA_DYNSET_SET_NAME, priv->set->name))
	379	goto nla_put_failure;
a8b1e36d	380	if (nla_put_be64(skb, NFTA_DYNSET_TIMEOUT,
917d80d3	381	nf_jiffies64_to_msecs(priv->timeout),
b46f6ded	382	NFTA_DYNSET_PAD))
22fe54d5	383	goto nla_put_failure;
ce537996 PNA	384	if (priv->set->num_exprs == 0) {
	385	if (priv->num_exprs == 1) {
	386	if (nft_expr_dump(skb, NFTA_DYNSET_EXPR,
8daa8fde	387	priv->expr_array[0], reset))
48b0ae04	388	goto nla_put_failure;
ce537996 PNA	389	} else if (priv->num_exprs > 1) {
	390	struct nlattr *nest;
	391
	392	nest = nla_nest_start_noflag(skb, NFTA_DYNSET_EXPRESSIONS);
	393	if (!nest)
	394	goto nla_put_failure;
	395
	396	for (i = 0; i < priv->num_exprs; i++) {
	397	if (nft_expr_dump(skb, NFTA_LIST_ELEM,
8daa8fde	398	priv->expr_array[i], reset))
ce537996 PNA	399	goto nla_put_failure;
	400	}
	401	nla_nest_end(skb, nest);
48b0ae04	402	}
563125a7	403	}
dbd2be06 PNA	404	if (nla_put_be32(skb, NFTA_DYNSET_FLAGS, htonl(flags)))
dbd2be06 PNA	405	goto nla_put_failure;
22fe54d5 PM	406	return 0;
	407
	408	nla_put_failure:
	409	return -1;
	410	}
	411
22fe54d5 PM	412	static const struct nft_expr_ops nft_dynset_ops = {
	413	.type = &nft_dynset_type,
	414	.size = NFT_EXPR_SIZE(sizeof(struct nft_dynset)),
	415	.eval = nft_dynset_eval,
	416	.init = nft_dynset_init,
	417	.destroy = nft_dynset_destroy,
273fe3f1	418	.activate = nft_dynset_activate,
cd5125d8	419	.deactivate = nft_dynset_deactivate,
22fe54d5	420	.dump = nft_dynset_dump,
b2d30654	421	.reduce = NFT_REDUCE_READONLY,
22fe54d5 PM	422	};
22fe54d5 PM	423
4e24877e	424	struct nft_expr_type nft_dynset_type __read_mostly = {
22fe54d5 PM	425	.name = "dynset",
	426	.ops = &nft_dynset_ops,
	427	.policy = nft_dynset_policy,
	428	.maxattr = NFTA_DYNSET_MAX,
	429	.owner = THIS_MODULE,
	430	};