// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
 *
 * Development of this code funded by Astaro AG (http://www.astaro.com/)
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/skbuff.h>
#include <linux/netlink.h>
#include <linux/vmalloc.h>
#include <linux/rhashtable.h>
#include <linux/audit.h>
#include <linux/netfilter.h>
#include <linux/netfilter/nfnetlink.h>
#include <linux/netfilter/nf_tables.h>
#include <net/netfilter/nf_flow_table.h>
#include <net/netfilter/nf_tables_core.h>
#include <net/netfilter/nf_tables.h>
#include <net/netfilter/nf_tables_offload.h>
#include <net/net_namespace.h>
#include <net/sock.h>

#define NFT_MODULE_AUTOLOAD_LIMIT (MODULE_NAME_LEN - sizeof("nft-expr-255-"))

unsigned int nf_tables_net_id __read_mostly;

static LIST_HEAD(nf_tables_expressions);
static LIST_HEAD(nf_tables_objects);
static LIST_HEAD(nf_tables_flowtables);
static LIST_HEAD(nf_tables_destroy_list);
static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
static u64 table_handle;

enum {
	NFT_VALIDATE_SKIP	= 0,
	NFT_VALIDATE_NEED,
	NFT_VALIDATE_DO,
};

static struct rhltable nft_objname_ht;

static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);

static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);

static const struct rhashtable_params nft_chain_ht_params = {
	.head_offset		= offsetof(struct nft_chain, rhlhead),
	.key_offset		= offsetof(struct nft_chain, name),
	.hashfn			= nft_chain_hash,
	.obj_hashfn		= nft_chain_hash_obj,
	.obj_cmpfn		= nft_chain_hash_cmp,
	.automatic_shrinking	= true,
};

static const struct rhashtable_params nft_objname_ht_params = {
	.head_offset		= offsetof(struct nft_object, rhlhead),
	.key_offset		= offsetof(struct nft_object, key),
	.hashfn			= nft_objname_hash,
	.obj_hashfn		= nft_objname_hash_obj,
	.obj_cmpfn		= nft_objname_hash_cmp,
	.automatic_shrinking	= true,
};

struct nft_audit_data {
	struct nft_table *table;
	int entries;
	int op;
	struct list_head list;
};

static const u8 nft2audit_op[NFT_MSG_MAX] = { // enum nf_tables_msg_types
	[NFT_MSG_NEWTABLE]	= AUDIT_NFT_OP_TABLE_REGISTER,
	[NFT_MSG_GETTABLE]	= AUDIT_NFT_OP_INVALID,
	[NFT_MSG_DELTABLE]	= AUDIT_NFT_OP_TABLE_UNREGISTER,
	[NFT_MSG_NEWCHAIN]	= AUDIT_NFT_OP_CHAIN_REGISTER,
	[NFT_MSG_GETCHAIN]	= AUDIT_NFT_OP_INVALID,
	[NFT_MSG_DELCHAIN]	= AUDIT_NFT_OP_CHAIN_UNREGISTER,
	[NFT_MSG_NEWRULE]	= AUDIT_NFT_OP_RULE_REGISTER,
	[NFT_MSG_GETRULE]	= AUDIT_NFT_OP_INVALID,
	[NFT_MSG_DELRULE]	= AUDIT_NFT_OP_RULE_UNREGISTER,
	[NFT_MSG_NEWSET]	= AUDIT_NFT_OP_SET_REGISTER,
	[NFT_MSG_GETSET]	= AUDIT_NFT_OP_INVALID,
	[NFT_MSG_DELSET]	= AUDIT_NFT_OP_SET_UNREGISTER,
	[NFT_MSG_NEWSETELEM]	= AUDIT_NFT_OP_SETELEM_REGISTER,
	[NFT_MSG_GETSETELEM]	= AUDIT_NFT_OP_INVALID,
	[NFT_MSG_DELSETELEM]	= AUDIT_NFT_OP_SETELEM_UNREGISTER,
	[NFT_MSG_NEWGEN]	= AUDIT_NFT_OP_GEN_REGISTER,
	[NFT_MSG_GETGEN]	= AUDIT_NFT_OP_INVALID,
	[NFT_MSG_TRACE]		= AUDIT_NFT_OP_INVALID,
	[NFT_MSG_NEWOBJ]	= AUDIT_NFT_OP_OBJ_REGISTER,
	[NFT_MSG_GETOBJ]	= AUDIT_NFT_OP_INVALID,
	[NFT_MSG_DELOBJ]	= AUDIT_NFT_OP_OBJ_UNREGISTER,
	[NFT_MSG_GETOBJ_RESET]	= AUDIT_NFT_OP_OBJ_RESET,
	[NFT_MSG_NEWFLOWTABLE]	= AUDIT_NFT_OP_FLOWTABLE_REGISTER,
	[NFT_MSG_GETFLOWTABLE]	= AUDIT_NFT_OP_INVALID,
	[NFT_MSG_DELFLOWTABLE]	= AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
};

static void nft_validate_state_update(struct net *net, u8 new_validate_state)
{
	struct nftables_pernet *nft_net = nft_pernet(net);

	switch (nft_net->validate_state) {
	case NFT_VALIDATE_SKIP:
		WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
		break;
	case NFT_VALIDATE_NEED:
		break;
	case NFT_VALIDATE_DO:
		if (new_validate_state == NFT_VALIDATE_NEED)
			return;
	}

	nft_net->validate_state = new_validate_state;
}
static void nf_tables_trans_destroy_work(struct work_struct *w);
static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);

static void nft_ctx_init(struct nft_ctx *ctx,
			 struct net *net,
			 const struct sk_buff *skb,
			 const struct nlmsghdr *nlh,
			 u8 family,
			 struct nft_table *table,
			 struct nft_chain *chain,
			 const struct nlattr * const *nla)
{
	ctx->net	= net;
	ctx->family	= family;
	ctx->level	= 0;
	ctx->table	= table;
	ctx->chain	= chain;
	ctx->nla   	= nla;
	ctx->portid	= NETLINK_CB(skb).portid;
	ctx->report	= nlmsg_report(nlh);
	ctx->flags	= nlh->nlmsg_flags;
	ctx->seq	= nlh->nlmsg_seq;
}

static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
					     int msg_type, u32 size, gfp_t gfp)
{
	struct nft_trans *trans;

	trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
	if (trans == NULL)
		return NULL;

	trans->msg_type = msg_type;
	trans->ctx	= *ctx;

	return trans;
}

static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
					 int msg_type, u32 size)
{
	return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
}

static void nft_trans_destroy(struct nft_trans *trans)
{
	list_del(&trans->list);
	kfree(trans);
}

static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
{
	struct nftables_pernet *nft_net;
	struct net *net = ctx->net;
	struct nft_trans *trans;

	if (!nft_set_is_anonymous(set))
		return;

	nft_net = nft_pernet(net);
	list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
		switch (trans->msg_type) {
		case NFT_MSG_NEWSET:
			if (nft_trans_set(trans) == set)
				nft_trans_set_bound(trans) = true;
			break;
		case NFT_MSG_NEWSETELEM:
			if (nft_trans_elem_set(trans) == set)
				nft_trans_elem_set_bound(trans) = true;
			break;
		}
	}
}

static int nft_netdev_register_hooks(struct net *net,
				     struct list_head *hook_list)
{
	struct nft_hook *hook;
	int err, j;

	j = 0;
	list_for_each_entry(hook, hook_list, list) {
		err = nf_register_net_hook(net, &hook->ops);
		if (err < 0)
			goto err_register;

		j++;
	}
	return 0;

err_register:
	list_for_each_entry(hook, hook_list, list) {
		if (j-- <= 0)
			break;

		nf_unregister_net_hook(net, &hook->ops);
	}
	return err;
}

static void nft_netdev_unregister_hooks(struct net *net,
					struct list_head *hook_list)
{
	struct nft_hook *hook;

	list_for_each_entry(hook, hook_list, list)
		nf_unregister_net_hook(net, &hook->ops);
}

static int nf_tables_register_hook(struct net *net,
				   const struct nft_table *table,
				   struct nft_chain *chain)
{
	struct nft_base_chain *basechain;
	const struct nf_hook_ops *ops;

	if (table->flags & NFT_TABLE_F_DORMANT ||
	    !nft_is_base_chain(chain))
		return 0;

	basechain = nft_base_chain(chain);
	ops = &basechain->ops;

	if (basechain->type->ops_register)
		return basechain->type->ops_register(net, ops);

	if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
		return nft_netdev_register_hooks(net, &basechain->hook_list);

	return nf_register_net_hook(net, &basechain->ops);
}

static void nf_tables_unregister_hook(struct net *net,
				      const struct nft_table *table,
				      struct nft_chain *chain)
{
	struct nft_base_chain *basechain;
	const struct nf_hook_ops *ops;

	if (table->flags & NFT_TABLE_F_DORMANT ||
	    !nft_is_base_chain(chain))
		return;
	basechain = nft_base_chain(chain);
	ops = &basechain->ops;

	if (basechain->type->ops_unregister)
		return basechain->type->ops_unregister(net, ops);

	if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
		nft_netdev_unregister_hooks(net, &basechain->hook_list);
	else
		nf_unregister_net_hook(net, &basechain->ops);
}

static void nft_trans_commit_list_add_tail(struct net *net, struct nft_trans *trans)
{
	struct nftables_pernet *nft_net = nft_pernet(net);

	list_add_tail(&trans->list, &nft_net->commit_list);
}

static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
{
	struct nft_trans *trans;

	trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
	if (trans == NULL)
		return -ENOMEM;

	if (msg_type == NFT_MSG_NEWTABLE)
		nft_activate_next(ctx->net, ctx->table);

	nft_trans_commit_list_add_tail(ctx->net, trans);
	return 0;
}

static int nft_deltable(struct nft_ctx *ctx)
{
	int err;

	err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
	if (err < 0)
		return err;

	nft_deactivate_next(ctx->net, ctx->table);
	return err;
}

static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
{
	struct nft_trans *trans;

	trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
	if (trans == NULL)
		return ERR_PTR(-ENOMEM);

	if (msg_type == NFT_MSG_NEWCHAIN) {
		nft_activate_next(ctx->net, ctx->chain);

		if (ctx->nla[NFTA_CHAIN_ID]) {
			nft_trans_chain_id(trans) =
				ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
		}
	}

	nft_trans_commit_list_add_tail(ctx->net, trans);
	return trans;
}

static int nft_delchain(struct nft_ctx *ctx)
{
	struct nft_trans *trans;

	trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
	if (IS_ERR(trans))
		return PTR_ERR(trans);

	ctx->table->use--;
	nft_deactivate_next(ctx->net, ctx->chain);

	return 0;
}

static void nft_rule_expr_activate(const struct nft_ctx *ctx,
				   struct nft_rule *rule)
{
	struct nft_expr *expr;

	expr = nft_expr_first(rule);
	while (nft_expr_more(rule, expr)) {
		if (expr->ops->activate)
			expr->ops->activate(ctx, expr);

		expr = nft_expr_next(expr);
	}
}

static void nft_rule_expr_deactivate(const struct nft_ctx *ctx,
				     struct nft_rule *rule,
				     enum nft_trans_phase phase)
{
	struct nft_expr *expr;

	expr = nft_expr_first(rule);
	while (nft_expr_more(rule, expr)) {
		if (expr->ops->deactivate)
			expr->ops->deactivate(ctx, expr, phase);

		expr = nft_expr_next(expr);
	}
}

static int
nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
{
	/* You cannot delete the same rule twice */
	if (nft_is_active_next(ctx->net, rule)) {
		nft_deactivate_next(ctx->net, rule);
		ctx->chain->use--;
		return 0;
	}
	return -ENOENT;
}

static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
					    struct nft_rule *rule)
{
	struct nft_trans *trans;

	trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
	if (trans == NULL)
		return NULL;

	if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
		nft_trans_rule_id(trans) =
			ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
	}
	nft_trans_rule(trans) = rule;
	nft_trans_commit_list_add_tail(ctx->net, trans);

	return trans;
}

static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
{
	struct nft_flow_rule *flow;
	struct nft_trans *trans;
	int err;

	trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
	if (trans == NULL)
		return -ENOMEM;

	if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
		flow = nft_flow_rule_create(ctx->net, rule);
		if (IS_ERR(flow)) {
			nft_trans_destroy(trans);
			return PTR_ERR(flow);
		}

		nft_trans_flow_rule(trans) = flow;
	}

	err = nf_tables_delrule_deactivate(ctx, rule);
	if (err < 0) {
		nft_trans_destroy(trans);
		return err;
	}
	nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);

	return 0;
}

static int nft_delrule_by_chain(struct nft_ctx *ctx)
{
	struct nft_rule *rule;
	int err;

	list_for_each_entry(rule, &ctx->chain->rules, list) {
		if (!nft_is_active_next(ctx->net, rule))
			continue;

		err = nft_delrule(ctx, rule);
		if (err < 0)
			return err;
	}
	return 0;
}

static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
			     struct nft_set *set)
{
	struct nft_trans *trans;

	trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
	if (trans == NULL)
		return -ENOMEM;

	if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
		nft_trans_set_id(trans) =
			ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
		nft_activate_next(ctx->net, set);
	}
	nft_trans_set(trans) = set;
	nft_trans_commit_list_add_tail(ctx->net, trans);

	return 0;
}

static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
{
	int err;

	err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
	if (err < 0)
		return err;

	nft_deactivate_next(ctx->net, set);
	ctx->table->use--;

	return err;
}

static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
			     struct nft_object *obj)
{
	struct nft_trans *trans;

	trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
	if (trans == NULL)
		return -ENOMEM;

	if (msg_type == NFT_MSG_NEWOBJ)
		nft_activate_next(ctx->net, obj);

	nft_trans_obj(trans) = obj;
	nft_trans_commit_list_add_tail(ctx->net, trans);

	return 0;
}

static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
{
	int err;

	err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
	if (err < 0)
		return err;

	nft_deactivate_next(ctx->net, obj);
	ctx->table->use--;

	return err;
}

static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
				   struct nft_flowtable *flowtable)
{
	struct nft_trans *trans;

	trans = nft_trans_alloc(ctx, msg_type,
				sizeof(struct nft_trans_flowtable));
	if (trans == NULL)
		return -ENOMEM;

	if (msg_type == NFT_MSG_NEWFLOWTABLE)
		nft_activate_next(ctx->net, flowtable);

	nft_trans_flowtable(trans) = flowtable;
	nft_trans_commit_list_add_tail(ctx->net, trans);

	return 0;
}

static int nft_delflowtable(struct nft_ctx *ctx,
			    struct nft_flowtable *flowtable)
{
	int err;

	err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
	if (err < 0)
		return err;

	nft_deactivate_next(ctx->net, flowtable);
	ctx->table->use--;

	return err;
}

/*
 * Tables
 */

static struct nft_table *nft_table_lookup(const struct net *net,
					  const struct nlattr *nla,
					  u8 family, u8 genmask, u32 nlpid)
{
	struct nftables_pernet *nft_net;
	struct nft_table *table;

	if (nla == NULL)
		return ERR_PTR(-EINVAL);

	nft_net = nft_pernet(net);
	list_for_each_entry_rcu(table, &nft_net->tables, list,
				lockdep_is_held(&nft_net->commit_mutex)) {
		if (!nla_strcmp(nla, table->name) &&
		    table->family == family &&
		    nft_active_genmask(table, genmask)) {
			if (nft_table_has_owner(table) &&
			    nlpid && table->nlpid != nlpid)
				return ERR_PTR(-EPERM);

			return table;
		}
	}

	return ERR_PTR(-ENOENT);
}

static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
						   const struct nlattr *nla,
						   u8 genmask, u32 nlpid)
{
	struct nftables_pernet *nft_net;
	struct nft_table *table;

	nft_net = nft_pernet(net);
	list_for_each_entry(table, &nft_net->tables, list) {
		if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
		    nft_active_genmask(table, genmask)) {
			if (nft_table_has_owner(table) &&
			    nlpid && table->nlpid != nlpid)
				return ERR_PTR(-EPERM);

			return table;
		}
	}

	return ERR_PTR(-ENOENT);
}

static inline u64 nf_tables_alloc_handle(struct nft_table *table)
{
	return ++table->hgenerator;
}

static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];

static const struct nft_chain_type *
__nft_chain_type_get(u8 family, enum nft_chain_types type)
{
	if (family >= NFPROTO_NUMPROTO ||
	    type >= NFT_CHAIN_T_MAX)
		return NULL;

	return chain_type[family][type];
}

static const struct nft_chain_type *
__nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
{
	const struct nft_chain_type *type;
	int i;

	for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
		type = __nft_chain_type_get(family, i);
		if (!type)
			continue;
		if (!nla_strcmp(nla, type->name))
			return type;
	}
	return NULL;
}

struct nft_module_request {
	struct list_head	list;
	char			module[MODULE_NAME_LEN];
	bool			done;
};

#ifdef CONFIG_MODULES
__printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
				      ...)
{
	char module_name[MODULE_NAME_LEN];
	struct nftables_pernet *nft_net;
	struct nft_module_request *req;
	va_list args;
	int ret;

	va_start(args, fmt);
	ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
	va_end(args);
	if (ret >= MODULE_NAME_LEN)
		return 0;

	nft_net = nft_pernet(net);
	list_for_each_entry(req, &nft_net->module_list, list) {
		if (!strcmp(req->module, module_name)) {
			if (req->done)
				return 0;

			/* A request to load this module already exists. */
			return -EAGAIN;
		}
	}

	req = kmalloc(sizeof(*req), GFP_KERNEL);
	if (!req)
		return -ENOMEM;

	req->done = false;
	strlcpy(req->module, module_name, MODULE_NAME_LEN);
	list_add_tail(&req->list, &nft_net->module_list);

	return -EAGAIN;
}
EXPORT_SYMBOL_GPL(nft_request_module);
#endif

static void lockdep_nfnl_nft_mutex_not_held(void)
{
#ifdef CONFIG_PROVE_LOCKING
	if (debug_locks)
		WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
#endif
}

static const struct nft_chain_type *
nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
			    u8 family, bool autoload)
{
	const struct nft_chain_type *type;

	type = __nf_tables_chain_type_lookup(nla, family);
	if (type != NULL)
		return type;

	lockdep_nfnl_nft_mutex_not_held();
#ifdef CONFIG_MODULES
	if (autoload) {
		if (nft_request_module(net, "nft-chain-%u-%.*s", family,
				       nla_len(nla),
				       (const char *)nla_data(nla)) == -EAGAIN)
			return ERR_PTR(-EAGAIN);
	}
#endif
	return ERR_PTR(-ENOENT);
}

static __be16 nft_base_seq(const struct net *net)
{
	struct nftables_pernet *nft_net = nft_pernet(net);

	return htons(nft_net->base_seq & 0xffff);
}

static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
	[NFTA_TABLE_NAME]	= { .type = NLA_STRING,
				    .len = NFT_TABLE_MAXNAMELEN - 1 },
	[NFTA_TABLE_FLAGS]	= { .type = NLA_U32 },
	[NFTA_TABLE_HANDLE]	= { .type = NLA_U64 },
	[NFTA_TABLE_USERDATA]	= { .type = NLA_BINARY,
				    .len = NFT_USERDATA_MAXLEN }
};

static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
				     u32 portid, u32 seq, int event, u32 flags,
				     int family, const struct nft_table *table)
{
	struct nlmsghdr *nlh;

	event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
	nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
			   NFNETLINK_V0, nft_base_seq(net));
	if (!nlh)
		goto nla_put_failure;

	if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
	    nla_put_be32(skb, NFTA_TABLE_FLAGS,
			 htonl(table->flags & NFT_TABLE_F_MASK)) ||
	    nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
	    nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
			 NFTA_TABLE_PAD))
		goto nla_put_failure;
	if (nft_table_has_owner(table) &&
	    nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
		goto nla_put_failure;

	if (table->udata) {
		if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
			goto nla_put_failure;
	}

	nlmsg_end(skb, nlh);
	return 0;

nla_put_failure:
	nlmsg_trim(skb, nlh);
	return -1;
}

struct nftnl_skb_parms {
	bool report;
};
#define NFT_CB(skb)	(*(struct nftnl_skb_parms*)&((skb)->cb))

static void nft_notify_enqueue(struct sk_buff *skb, bool report,
			       struct list_head *notify_list)
{
	NFT_CB(skb).report = report;
	list_add_tail(&skb->list, notify_list);
}

static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
{
	struct nftables_pernet *nft_net;
	struct sk_buff *skb;
	u16 flags = 0;
	int err;

	if (!ctx->report &&
	    !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
		return;

	skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
	if (skb == NULL)
		goto err;

	if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
		flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);

	err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
					event, flags, ctx->family, ctx->table);
	if (err < 0) {
		kfree_skb(skb);
		goto err;
	}

	nft_net = nft_pernet(ctx->net);
	nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
	return;
err:
	nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
}

static int nf_tables_dump_tables(struct sk_buff *skb,
				 struct netlink_callback *cb)
{
	const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
	struct nftables_pernet *nft_net;
	const struct nft_table *table;
	unsigned int idx = 0, s_idx = cb->args[0];
	struct net *net = sock_net(skb->sk);
	int family = nfmsg->nfgen_family;

	rcu_read_lock();
	nft_net = nft_pernet(net);
	cb->seq = nft_net->base_seq;

	list_for_each_entry_rcu(table, &nft_net->tables, list) {
		if (family != NFPROTO_UNSPEC && family != table->family)
			continue;

		if (idx < s_idx)
			goto cont;
		if (idx > s_idx)
			memset(&cb->args[1], 0,
			       sizeof(cb->args) - sizeof(cb->args[0]));
		if (!nft_is_active(net, table))
			continue;
		if (nf_tables_fill_table_info(skb, net,
					      NETLINK_CB(cb->skb).portid,
					      cb->nlh->nlmsg_seq,
					      NFT_MSG_NEWTABLE, NLM_F_MULTI,
					      table->family, table) < 0)
			goto done;

		nl_dump_check_consistent(cb, nlmsg_hdr(skb));
cont:
		idx++;
	}
done:
	rcu_read_unlock();
	cb->args[0] = idx;
	return skb->len;
}

static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
				      const struct nlmsghdr *nlh,
				      struct netlink_dump_control *c)
{
	int err;

	if (!try_module_get(THIS_MODULE))
		return -EINVAL;

	rcu_read_unlock();
	err = netlink_dump_start(nlsk, skb, nlh, c);
	rcu_read_lock();
	module_put(THIS_MODULE);

	return err;
}

/* called with rcu_read_lock held */
static int nf_tables_gettable(struct sk_buff *skb, const struct nfnl_info *info,
			      const struct nlattr * const nla[])
{
	struct netlink_ext_ack *extack = info->extack;
	u8 genmask = nft_genmask_cur(info->net);
	u8 family = info->nfmsg->nfgen_family;
	const struct nft_table *table;
	struct net *net = info->net;
	struct sk_buff *skb2;
	int err;

	if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
		struct netlink_dump_control c = {
			.dump = nf_tables_dump_tables,
			.module = THIS_MODULE,
		};

		return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
	}

	table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
	if (IS_ERR(table)) {
		NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
		return PTR_ERR(table);
	}

	skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
	if (!skb2)
		return -ENOMEM;

	err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
					info->nlh->nlmsg_seq, NFT_MSG_NEWTABLE,
					0, family, table);
	if (err < 0)
		goto err_fill_table_info;

	return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);

err_fill_table_info:
	kfree_skb(skb2);
	return err;
}

static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
{
	struct nft_chain *chain;
	u32 i = 0;

	list_for_each_entry(chain, &table->chains, list) {
		if (!nft_is_active_next(net, chain))
			continue;
		if (!nft_is_base_chain(chain))
			continue;

		if (cnt && i++ == cnt)
			break;

		nf_tables_unregister_hook(net, table, chain);
	}
}

static int nf_tables_table_enable(struct net *net, struct nft_table *table)
{
	struct nft_chain *chain;
	int err, i = 0;

	list_for_each_entry(chain, &table->chains, list) {
		if (!nft_is_active_next(net, chain))
			continue;
		if (!nft_is_base_chain(chain))
			continue;

		err = nf_tables_register_hook(net, table, chain);
		if (err < 0)
			goto err_register_hooks;

		i++;
	}
	return 0;

err_register_hooks:
	if (i)
		nft_table_disable(net, table, i);
	return err;
}

static void nf_tables_table_disable(struct net *net, struct nft_table *table)
{
	table->flags &= ~NFT_TABLE_F_DORMANT;
	nft_table_disable(net, table, 0);
	table->flags |= NFT_TABLE_F_DORMANT;
}

#define __NFT_TABLE_F_INTERNAL		(NFT_TABLE_F_MASK + 1)
#define __NFT_TABLE_F_WAS_DORMANT	(__NFT_TABLE_F_INTERNAL << 0)
#define __NFT_TABLE_F_WAS_AWAKEN	(__NFT_TABLE_F_INTERNAL << 1)
#define __NFT_TABLE_F_UPDATE		(__NFT_TABLE_F_WAS_DORMANT | \
					 __NFT_TABLE_F_WAS_AWAKEN)

static int nf_tables_updtable(struct nft_ctx *ctx)
{
	struct nft_trans *trans;
	u32 flags;
	int ret;

	if (!ctx->nla[NFTA_TABLE_FLAGS])
		return 0;

	flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
	if (flags & ~NFT_TABLE_F_MASK)
		return -EOPNOTSUPP;

	if (flags == ctx->table->flags)
		return 0;

	if ((nft_table_has_owner(ctx->table) &&
	     !(flags & NFT_TABLE_F_OWNER)) ||
	    (!nft_table_has_owner(ctx->table) &&
	     flags & NFT_TABLE_F_OWNER))
		return -EOPNOTSUPP;

	trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
				sizeof(struct nft_trans_table));
	if (trans == NULL)
		return -ENOMEM;

	if ((flags & NFT_TABLE_F_DORMANT) &&
	    !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
		ctx->table->flags |= NFT_TABLE_F_DORMANT;
		if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE))
			ctx->table->flags |= __NFT_TABLE_F_WAS_AWAKEN;
	} else if (!(flags & NFT_TABLE_F_DORMANT) &&
		   ctx->table->flags & NFT_TABLE_F_DORMANT) {
		ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
		if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE)) {
			ret = nf_tables_table_enable(ctx->net, ctx->table);
			if (ret < 0)
				goto err_register_hooks;

			ctx->table->flags |= __NFT_TABLE_F_WAS_DORMANT;
		}
	}

	nft_trans_table_update(trans) = true;
	nft_trans_commit_list_add_tail(ctx->net, trans);

	return 0;

err_register_hooks:
	nft_trans_destroy(trans);
	return ret;
}

static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
{
	const char *name = data;

	return jhash(name, strlen(name), seed);
}

static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
{
	const struct nft_chain *chain = data;

	return nft_chain_hash(chain->name, 0, seed);
}

static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
			      const void *ptr)
{
	const struct nft_chain *chain = ptr;
	const char *name = arg->key;

	return strcmp(chain->name, name);
}

static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
{
	const struct nft_object_hash_key *k = data;

	seed ^= hash_ptr(k->table, 32);

	return jhash(k->name, strlen(k->name), seed);
}

static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
{
	const struct nft_object *obj = data;

	return nft_objname_hash(&obj->key, 0, seed);
}

static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
				const void *ptr)
{
	const struct nft_object_hash_key *k = arg->key;
	const struct nft_object *obj = ptr;

	if (obj->key.table != k->table)
		return -1;

	return strcmp(obj->key.name, k->name);
}

static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info,
			      const struct nlattr * const nla[])
{
	struct nftables_pernet *nft_net = nft_pernet(info->net);
	struct netlink_ext_ack *extack = info->extack;
	u8 genmask = nft_genmask_next(info->net);
	u8 family = info->nfmsg->nfgen_family;
	struct net *net = info->net;
	const struct nlattr *attr;
	struct nft_table *table;
	struct nft_ctx ctx;
	u32 flags = 0;
	int err;

	lockdep_assert_held(&nft_net->commit_mutex);
	attr = nla[NFTA_TABLE_NAME];
	table = nft_table_lookup(net, attr, family, genmask,
				 NETLINK_CB(skb).portid);
	if (IS_ERR(table)) {
		if (PTR_ERR(table) != -ENOENT)
			return PTR_ERR(table);
	} else {
		if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
			NL_SET_BAD_ATTR(extack, attr);
			return -EEXIST;
		}
		if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
			return -EOPNOTSUPP;

		nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);

		return nf_tables_updtable(&ctx);
	}

	if (nla[NFTA_TABLE_FLAGS]) {
		flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
		if (flags & ~NFT_TABLE_F_MASK)
			return -EOPNOTSUPP;
	}

	err = -ENOMEM;
	table = kzalloc(sizeof(*table), GFP_KERNEL);
	if (table == NULL)
		goto err_kzalloc;

	table->name = nla_strdup(attr, GFP_KERNEL);
	if (table->name == NULL)
		goto err_strdup;

	if (nla[NFTA_TABLE_USERDATA]) {
		table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL);
		if (table->udata == NULL)
			goto err_table_udata;

		table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
	}

	err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
	if (err)
		goto err_chain_ht;

	INIT_LIST_HEAD(&table->chains);
	INIT_LIST_HEAD(&table->sets);
	INIT_LIST_HEAD(&table->objects);
	INIT_LIST_HEAD(&table->flowtables);
	table->family = family;
	table->flags = flags;
	table->handle = ++table_handle;
	if (table->flags & NFT_TABLE_F_OWNER)
		table->nlpid = NETLINK_CB(skb).portid;

	nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
	err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
	if (err < 0)
		goto err_trans;

	list_add_tail_rcu(&table->list, &nft_net->tables);
	return 0;
err_trans:
	rhltable_destroy(&table->chains_ht);
err_chain_ht:
	kfree(table->udata);
err_table_udata:
	kfree(table->name);
err_strdup:
	kfree(table);
err_kzalloc:
	return err;
}

static int nft_flush_table(struct nft_ctx *ctx)
{
	struct nft_flowtable *flowtable, *nft;
	struct nft_chain *chain, *nc;
	struct nft_object *obj, *ne;
	struct nft_set *set, *ns;
	int err;

	list_for_each_entry(chain, &ctx->table->chains, list) {
		if (!nft_is_active_next(ctx->net, chain))
			continue;

		if (nft_chain_is_bound(chain))
			continue;

		ctx->chain = chain;

		err = nft_delrule_by_chain(ctx);
		if (err < 0)
			goto out;
	}

	list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
		if (!nft_is_active_next(ctx->net, set))
			continue;

		if (nft_set_is_anonymous(set) &&
		    !list_empty(&set->bindings))
			continue;

		err = nft_delset(ctx, set);
		if (err < 0)
			goto out;
	}

	list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
		if (!nft_is_active_next(ctx->net, flowtable))
			continue;

		err = nft_delflowtable(ctx, flowtable);
		if (err < 0)
			goto out;
	}

	list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
		if (!nft_is_active_next(ctx->net, obj))
			continue;

		err = nft_delobj(ctx, obj);
		if (err < 0)
			goto out;
	}

	list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
		if (!nft_is_active_next(ctx->net, chain))
			continue;

		if (nft_chain_is_bound(chain))
			continue;

		ctx->chain = chain;

		err = nft_delchain(ctx);
		if (err < 0)
			goto out;
	}

	err = nft_deltable(ctx);
out:
	return err;
}

static int nft_flush(struct nft_ctx *ctx, int family)
{
	struct nftables_pernet *nft_net = nft_pernet(ctx->net);
	const struct nlattr * const *nla = ctx->nla;
	struct nft_table *table, *nt;
	int err = 0;

	list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
		if (family != AF_UNSPEC && table->family != family)
			continue;

		ctx->family = table->family;

		if (!nft_is_active_next(ctx->net, table))
			continue;

		if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
			continue;

		if (nla[NFTA_TABLE_NAME] &&
		    nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
			continue;

		ctx->table = table;

		err = nft_flush_table(ctx);
		if (err < 0)
			goto out;
	}
out:
	return err;
}

static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info,
			      const struct nlattr * const nla[])
{
	struct netlink_ext_ack *extack = info->extack;
	u8 genmask = nft_genmask_next(info->net);
	u8 family = info->nfmsg->nfgen_family;
	struct net *net = info->net;
	const struct nlattr *attr;
	struct nft_table *table;
	struct nft_ctx ctx;

	nft_ctx_init(&ctx, net, skb, info->nlh, 0, NULL, NULL, nla);
	if (family == AF_UNSPEC ||
	    (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
		return nft_flush(&ctx, family);

	if (nla[NFTA_TABLE_HANDLE]) {
		attr = nla[NFTA_TABLE_HANDLE];
		table = nft_table_lookup_byhandle(net, attr, genmask,
						  NETLINK_CB(skb).portid);
	} else {
		attr = nla[NFTA_TABLE_NAME];
		table = nft_table_lookup(net, attr, family, genmask,
					 NETLINK_CB(skb).portid);
	}

	if (IS_ERR(table)) {
		NL_SET_BAD_ATTR(extack, attr);
		return PTR_ERR(table);
	}

	if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
	    table->use > 0)
		return -EBUSY;

	ctx.family = family;
	ctx.table = table;

	return nft_flush_table(&ctx);
}

static void nf_tables_table_destroy(struct nft_ctx *ctx)
{
	if (WARN_ON(ctx->table->use > 0))
		return;

	rhltable_destroy(&ctx->table->chains_ht);
	kfree(ctx->table->name);
	kfree(ctx->table->udata);
	kfree(ctx->table);
}

void nft_register_chain_type(const struct nft_chain_type *ctype)
{
	nfnl_lock(NFNL_SUBSYS_NFTABLES);
	if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
		nfnl_unlock(NFNL_SUBSYS_NFTABLES);
		return;
	}
	chain_type[ctype->family][ctype->type] = ctype;
	nfnl_unlock(NFNL_SUBSYS_NFTABLES);
}
EXPORT_SYMBOL_GPL(nft_register_chain_type);

void nft_unregister_chain_type(const struct nft_chain_type *ctype)
{
	nfnl_lock(NFNL_SUBSYS_NFTABLES);
	chain_type[ctype->family][ctype->type] = NULL;
	nfnl_unlock(NFNL_SUBSYS_NFTABLES);
}
EXPORT_SYMBOL_GPL(nft_unregister_chain_type);

/*
 * Chains
 */

static struct nft_chain *
nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
{
	struct nft_chain *chain;

	list_for_each_entry(chain, &table->chains, list) {
		if (chain->handle == handle &&
		    nft_active_genmask(chain, genmask))
			return chain;
	}

	return ERR_PTR(-ENOENT);
}

static bool lockdep_commit_lock_is_held(const struct net *net)
{
#ifdef CONFIG_PROVE_LOCKING
	struct nftables_pernet *nft_net = nft_pernet(net);

	return lockdep_is_held(&nft_net->commit_mutex);
#else
	return true;
#endif
}

static struct nft_chain *nft_chain_lookup(struct net *net,
					  struct nft_table *table,
					  const struct nlattr *nla, u8 genmask)
{
	char search[NFT_CHAIN_MAXNAMELEN + 1];
	struct rhlist_head *tmp, *list;
	struct nft_chain *chain;

	if (nla == NULL)
		return ERR_PTR(-EINVAL);

	nla_strscpy(search, nla, sizeof(search));

	WARN_ON(!rcu_read_lock_held() &&
		!lockdep_commit_lock_is_held(net));

	chain = ERR_PTR(-ENOENT);
	rcu_read_lock();
	list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
	if (!list)
		goto out_unlock;

	rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
		if (nft_active_genmask(chain, genmask))
			goto out_unlock;
	}
	chain = ERR_PTR(-ENOENT);
out_unlock:
	rcu_read_unlock();
	return chain;
}

static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
	[NFTA_CHAIN_TABLE]	= { .type = NLA_STRING,
				    .len = NFT_TABLE_MAXNAMELEN - 1 },
	[NFTA_CHAIN_HANDLE]	= { .type = NLA_U64 },
	[NFTA_CHAIN_NAME]	= { .type = NLA_STRING,
				    .len = NFT_CHAIN_MAXNAMELEN - 1 },
	[NFTA_CHAIN_HOOK]	= { .type = NLA_NESTED },
	[NFTA_CHAIN_POLICY]	= { .type = NLA_U32 },
	[NFTA_CHAIN_TYPE]	= { .type = NLA_STRING,
				    .len = NFT_MODULE_AUTOLOAD_LIMIT },
	[NFTA_CHAIN_COUNTERS]	= { .type = NLA_NESTED },
	[NFTA_CHAIN_FLAGS]	= { .type = NLA_U32 },
	[NFTA_CHAIN_ID]		= { .type = NLA_U32 },
	[NFTA_CHAIN_USERDATA]	= { .type = NLA_BINARY,
				    .len = NFT_USERDATA_MAXLEN },
};

static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
	[NFTA_HOOK_HOOKNUM]	= { .type = NLA_U32 },
	[NFTA_HOOK_PRIORITY]	= { .type = NLA_U32 },
	[NFTA_HOOK_DEV]		= { .type = NLA_STRING,
				    .len = IFNAMSIZ - 1 },
};

static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
{
	struct nft_stats *cpu_stats, total;
	struct nlattr *nest;
	unsigned int seq;
	u64 pkts, bytes;
	int cpu;

	if (!stats)
		return 0;

	memset(&total, 0, sizeof(total));
	for_each_possible_cpu(cpu) {
		cpu_stats = per_cpu_ptr(stats, cpu);
		do {
			seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
			pkts = cpu_stats->pkts;
			bytes = cpu_stats->bytes;
		} while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
		total.pkts += pkts;
		total.bytes += bytes;
	}
	nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
	if (nest == NULL)
		goto nla_put_failure;

	if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
			 NFTA_COUNTER_PAD) ||
	    nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
			 NFTA_COUNTER_PAD))
		goto nla_put_failure;

	nla_nest_end(skb, nest);
	return 0;

nla_put_failure:
	return -ENOSPC;
}

static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
				   const struct nft_base_chain *basechain)
{
	const struct nf_hook_ops *ops = &basechain->ops;
	struct nft_hook *hook, *first = NULL;
	struct nlattr *nest, *nest_devs;
	int n = 0;

	nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
	if (nest == NULL)
		goto nla_put_failure;
	if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
		goto nla_put_failure;
	if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
		goto nla_put_failure;

	if (nft_base_chain_netdev(family, ops->hooknum)) {
		nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
		list_for_each_entry(hook, &basechain->hook_list, list) {
			if (!first)
				first = hook;

			if (nla_put_string(skb, NFTA_DEVICE_NAME,
					   hook->ops.dev->name))
				goto nla_put_failure;
			n++;
		}
		nla_nest_end(skb, nest_devs);

		if (n == 1 &&
		    nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
			goto nla_put_failure;
	}
	nla_nest_end(skb, nest);

	return 0;
nla_put_failure:
	return -1;
}

static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
				     u32 portid, u32 seq, int event, u32 flags,
				     int family, const struct nft_table *table,
				     const struct nft_chain *chain)
{
	struct nlmsghdr *nlh;

	event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
	nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
			   NFNETLINK_V0, nft_base_seq(net));
	if (!nlh)
		goto nla_put_failure;

	if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
		goto nla_put_failure;
	if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
			 NFTA_CHAIN_PAD))
		goto nla_put_failure;
	if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
		goto nla_put_failure;

	if (nft_is_base_chain(chain)) {
		const struct nft_base_chain *basechain = nft_base_chain(chain);
		struct nft_stats __percpu *stats;

		if (nft_dump_basechain_hook(skb, family, basechain))
			goto nla_put_failure;

		if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
				 htonl(basechain->policy)))
			goto nla_put_failure;

		if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
			goto nla_put_failure;

		stats = rcu_dereference_check(basechain->stats,
					      lockdep_commit_lock_is_held(net));
		if (nft_dump_stats(skb, stats))
			goto nla_put_failure;
	}

	if (chain->flags &&
	    nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
		goto nla_put_failure;

	if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
		goto nla_put_failure;

	if (chain->udata &&
	    nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
		goto nla_put_failure;

	nlmsg_end(skb, nlh);
	return 0;

nla_put_failure:
	nlmsg_trim(skb, nlh);
	return -1;
}

static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
{
	struct nftables_pernet *nft_net;
	struct sk_buff *skb;
	u16 flags = 0;
	int err;

	if (!ctx->report &&
	    !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
		return;

	skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
	if (skb == NULL)
		goto err;

	if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
		flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);

	err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
					event, flags, ctx->family, ctx->table,
					ctx->chain);
	if (err < 0) {
		kfree_skb(skb);
		goto err;
	}

	nft_net = nft_pernet(ctx->net);
	nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
	return;
err:
	nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
}

static int nf_tables_dump_chains(struct sk_buff *skb,
				 struct netlink_callback *cb)
{
	const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
	unsigned int idx = 0, s_idx = cb->args[0];
	struct net *net = sock_net(skb->sk);
	int family = nfmsg->nfgen_family;
	struct nftables_pernet *nft_net;
	const struct nft_table *table;
	const struct nft_chain *chain;

	rcu_read_lock();
	nft_net = nft_pernet(net);
	cb->seq = nft_net->base_seq;

	list_for_each_entry_rcu(table, &nft_net->tables, list) {
		if (family != NFPROTO_UNSPEC && family != table->family)
			continue;

		list_for_each_entry_rcu(chain, &table->chains, list) {
			if (idx < s_idx)
				goto cont;
			if (idx > s_idx)
				memset(&cb->args[1], 0,
				       sizeof(cb->args) - sizeof(cb->args[0]));
			if (!nft_is_active(net, chain))
				continue;
			if (nf_tables_fill_chain_info(skb, net,
						      NETLINK_CB(cb->skb).portid,
						      cb->nlh->nlmsg_seq,
						      NFT_MSG_NEWCHAIN,
						      NLM_F_MULTI,
						      table->family, table,
						      chain) < 0)
				goto done;

			nl_dump_check_consistent(cb, nlmsg_hdr(skb));
cont:
			idx++;
		}
	}
done:
	rcu_read_unlock();
	cb->args[0] = idx;
	return skb->len;
}

/* called with rcu_read_lock held */
static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info,
			      const struct nlattr * const nla[])
{
	struct netlink_ext_ack *extack = info->extack;
	u8 genmask = nft_genmask_cur(info->net);
	u8 family = info->nfmsg->nfgen_family;
	const struct nft_chain *chain;
	struct net *net = info->net;
	struct nft_table *table;
	struct sk_buff *skb2;
	int err;

	if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
		struct netlink_dump_control c = {
			.dump = nf_tables_dump_chains,
			.module = THIS_MODULE,
		};

		return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
	}

	table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
	if (IS_ERR(table)) {
		NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
		return PTR_ERR(table);
	}

	chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
	if (IS_ERR(chain)) {
		NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
		return PTR_ERR(chain);
	}

	skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
	if (!skb2)
		return -ENOMEM;

	err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
					info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN,
					0, family, table, chain);
	if (err < 0)
		goto err_fill_chain_info;

	return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);

err_fill_chain_info:
	kfree_skb(skb2);
	return err;
}

static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
	[NFTA_COUNTER_PACKETS]	= { .type = NLA_U64 },
	[NFTA_COUNTER_BYTES]	= { .type = NLA_U64 },
};

static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
{
	struct nlattr *tb[NFTA_COUNTER_MAX+1];
	struct nft_stats __percpu *newstats;
	struct nft_stats *stats;
	int err;

	err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
					  nft_counter_policy, NULL);
	if (err < 0)
		return ERR_PTR(err);

	if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
		return ERR_PTR(-EINVAL);

	newstats = netdev_alloc_pcpu_stats(struct nft_stats);
	if (newstats == NULL)
		return ERR_PTR(-ENOMEM);

	/* Restore old counters on this cpu, no problem. Per-cpu statistics
	 * are not exposed to userspace.
	 */
	preempt_disable();
	stats = this_cpu_ptr(newstats);
	stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
	stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
	preempt_enable();

	return newstats;
}

static void nft_chain_stats_replace(struct nft_trans *trans)
{
	struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);

	if (!nft_trans_chain_stats(trans))
		return;

	nft_trans_chain_stats(trans) =
		rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
				    lockdep_commit_lock_is_held(trans->ctx.net));

	if (!nft_trans_chain_stats(trans))
		static_branch_inc(&nft_counters_enabled);
}

static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
{
	struct nft_rule **g0 = rcu_dereference_raw(chain->rules_gen_0);
	struct nft_rule **g1 = rcu_dereference_raw(chain->rules_gen_1);

	if (g0 != g1)
		kvfree(g1);
	kvfree(g0);

	/* should be NULL either via abort or via successful commit */
	WARN_ON_ONCE(chain->rules_next);
	kvfree(chain->rules_next);
}

void nf_tables_chain_destroy(struct nft_ctx *ctx)
{
	struct nft_chain *chain = ctx->chain;
	struct nft_hook *hook, *next;

	if (WARN_ON(chain->use > 0))
		return;

	/* no concurrent access possible anymore */
	nf_tables_chain_free_chain_rules(chain);

	if (nft_is_base_chain(chain)) {
		struct nft_base_chain *basechain = nft_base_chain(chain);

		if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
			list_for_each_entry_safe(hook, next,
						 &basechain->hook_list, list) {
				list_del_rcu(&hook->list);
				kfree_rcu(hook, rcu);
			}
		}
		module_put(basechain->type->owner);
		if (rcu_access_pointer(basechain->stats)) {
			static_branch_dec(&nft_counters_enabled);
			free_percpu(rcu_dereference_raw(basechain->stats));
		}
		kfree(chain->name);
		kfree(chain->udata);
		kfree(basechain);
	} else {
		kfree(chain->name);
		kfree(chain->udata);
		kfree(chain);
	}
}

static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
					      const struct nlattr *attr)
{
	struct net_device *dev;
	char ifname[IFNAMSIZ];
	struct nft_hook *hook;
	int err;

	hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL);
	if (!hook) {
		err = -ENOMEM;
		goto err_hook_alloc;
	}

	nla_strscpy(ifname, attr, IFNAMSIZ);
	/* nf_tables_netdev_event() is called under rtnl_mutex, this is
	 * indirectly serializing all the other holders of the commit_mutex with
	 * the rtnl_mutex.
	 */
	dev = __dev_get_by_name(net, ifname);
	if (!dev) {
		err = -ENOENT;
		goto err_hook_dev;
	}
	hook->ops.dev = dev;
	hook->inactive = false;

	return hook;

err_hook_dev:
	kfree(hook);
err_hook_alloc:
	return ERR_PTR(err);
}

static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
					   const struct nft_hook *this)
{
	struct nft_hook *hook;

	list_for_each_entry(hook, hook_list, list) {
		if (this->ops.dev == hook->ops.dev)
			return hook;
	}

	return NULL;
}

static int nf_tables_parse_netdev_hooks(struct net *net,
					const struct nlattr *attr,
					struct list_head *hook_list)
{
	struct nft_hook *hook, *next;
	const struct nlattr *tmp;
	int rem, n = 0, err;

	nla_for_each_nested(tmp, attr, rem) {
		if (nla_type(tmp) != NFTA_DEVICE_NAME) {
			err = -EINVAL;
			goto err_hook;
		}

		hook = nft_netdev_hook_alloc(net, tmp);
		if (IS_ERR(hook)) {
			err = PTR_ERR(hook);
			goto err_hook;
		}
		if (nft_hook_list_find(hook_list, hook)) {
			kfree(hook);
			err = -EEXIST;
			goto err_hook;
		}
		list_add_tail(&hook->list, hook_list);
		n++;

		if (n == NFT_NETDEVICE_MAX) {
			err = -EFBIG;
			goto err_hook;
		}
	}

	return 0;

err_hook:
	list_for_each_entry_safe(hook, next, hook_list, list) {
		list_del(&hook->list);
		kfree(hook);
	}
	return err;
}

struct nft_chain_hook {
	u32				num;
	s32				priority;
	const struct nft_chain_type	*type;
	struct list_head		list;
};

static int nft_chain_parse_netdev(struct net *net,
				  struct nlattr *tb[],
				  struct list_head *hook_list)
{
	struct nft_hook *hook;
	int err;

	if (tb[NFTA_HOOK_DEV]) {
		hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
		if (IS_ERR(hook))
			return PTR_ERR(hook);

		list_add_tail(&hook->list, hook_list);
	} else if (tb[NFTA_HOOK_DEVS]) {
		err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
						   hook_list);
		if (err < 0)
			return err;

		if (list_empty(hook_list))
			return -EINVAL;
	} else {
		return -EINVAL;
	}

	return 0;
}

static int nft_chain_parse_hook(struct net *net,
				const struct nlattr * const nla[],
				struct nft_chain_hook *hook, u8 family,
				struct netlink_ext_ack *extack, bool autoload)
{
	struct nftables_pernet *nft_net = nft_pernet(net);
	struct nlattr *ha[NFTA_HOOK_MAX + 1];
	const struct nft_chain_type *type;
	int err;

	lockdep_assert_held(&nft_net->commit_mutex);
	lockdep_nfnl_nft_mutex_not_held();

	err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
					  nla[NFTA_CHAIN_HOOK],
					  nft_hook_policy, NULL);
	if (err < 0)
		return err;

	if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
	    ha[NFTA_HOOK_PRIORITY] == NULL)
		return -EINVAL;

	hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
	hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));

	type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
	if (!type)
		return -EOPNOTSUPP;

	if (nla[NFTA_CHAIN_TYPE]) {
		type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
						   family, autoload);
		if (IS_ERR(type)) {
			NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
			return PTR_ERR(type);
		}
	}
	if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
		return -EOPNOTSUPP;

	if (type->type == NFT_CHAIN_T_NAT &&
	    hook->priority <= NF_IP_PRI_CONNTRACK)
		return -EOPNOTSUPP;

	if (!try_module_get(type->owner)) {
		if (nla[NFTA_CHAIN_TYPE])
			NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
		return -ENOENT;
	}

	hook->type = type;

	INIT_LIST_HEAD(&hook->list);
	if (nft_base_chain_netdev(family, hook->num)) {
		err = nft_chain_parse_netdev(net, ha, &hook->list);
		if (err < 0) {
			module_put(type->owner);
			return err;
		}
	} else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
		module_put(type->owner);
		return -EOPNOTSUPP;
	}

	return 0;
}

static void nft_chain_release_hook(struct nft_chain_hook *hook)
{
	struct nft_hook *h, *next;

	list_for_each_entry_safe(h, next, &hook->list, list) {
		list_del(&h->list);
		kfree(h);
	}
	module_put(hook->type->owner);
}

struct nft_rules_old {
	struct rcu_head h;
	struct nft_rule **start;
};

static struct nft_rule **nf_tables_chain_alloc_rules(const struct nft_chain *chain,
						     unsigned int alloc)
{
	if (alloc > INT_MAX)
		return NULL;

	alloc += 1;	/* NULL, ends rules */
	if (sizeof(struct nft_rule *) > INT_MAX / alloc)
		return NULL;

	alloc *= sizeof(struct nft_rule *);
	alloc += sizeof(struct nft_rules_old);

	return kvmalloc(alloc, GFP_KERNEL);
}

static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
				    const struct nft_chain_hook *hook,
				    struct nft_chain *chain)
{
	ops->pf			= family;
	ops->hooknum		= hook->num;
	ops->priority		= hook->priority;
	ops->priv		= chain;
	ops->hook		= hook->type->hooks[ops->hooknum];
	ops->hook_ops_type	= NF_HOOK_OP_NF_TABLES;
}

static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
			      struct nft_chain_hook *hook, u32 flags)
{
	struct nft_chain *chain;
	struct nft_hook *h;

	basechain->type = hook->type;
	INIT_LIST_HEAD(&basechain->hook_list);
	chain = &basechain->chain;

	if (nft_base_chain_netdev(family, hook->num)) {
		list_splice_init(&hook->list, &basechain->hook_list);
		list_for_each_entry(h, &basechain->hook_list, list)
			nft_basechain_hook_init(&h->ops, family, hook, chain);

		basechain->ops.hooknum	= hook->num;
		basechain->ops.priority	= hook->priority;
	} else {
		nft_basechain_hook_init(&basechain->ops, family, hook, chain);
	}

	chain->flags |= NFT_CHAIN_BASE | flags;
	basechain->policy = NF_ACCEPT;
	if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
	    nft_chain_offload_priority(basechain) < 0)
		return -EOPNOTSUPP;

	flow_block_init(&basechain->flow_block);

	return 0;
}

static int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
{
	int err;

	err = rhltable_insert_key(&table->chains_ht, chain->name,
				  &chain->rhlhead, nft_chain_ht_params);
	if (err)
		return err;

	list_add_tail_rcu(&chain->list, &table->chains);

	return 0;
}

static u64 chain_id;

static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
			      u8 policy, u32 flags,
			      struct netlink_ext_ack *extack)
{
	const struct nlattr * const *nla = ctx->nla;
	struct nft_table *table = ctx->table;
	struct nft_base_chain *basechain;
	struct nft_stats __percpu *stats;
	struct net *net = ctx->net;
	char name[NFT_NAME_MAXLEN];
	struct nft_trans *trans;
	struct nft_chain *chain;
	struct nft_rule **rules;
	int err;

	if (table->use == UINT_MAX)
		return -EOVERFLOW;

	if (nla[NFTA_CHAIN_HOOK]) {
		struct nft_chain_hook hook;

		if (flags & NFT_CHAIN_BINDING)
			return -EOPNOTSUPP;

		err = nft_chain_parse_hook(net, nla, &hook, family, extack,
					   true);
		if (err < 0)
			return err;

		basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
		if (basechain == NULL) {
			nft_chain_release_hook(&hook);
			return -ENOMEM;
		}
		chain = &basechain->chain;

		if (nla[NFTA_CHAIN_COUNTERS]) {
			stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
			if (IS_ERR(stats)) {
				nft_chain_release_hook(&hook);
				kfree(basechain);
				return PTR_ERR(stats);
			}
			rcu_assign_pointer(basechain->stats, stats);
			static_branch_inc(&nft_counters_enabled);
		}

		err = nft_basechain_init(basechain, family, &hook, flags);
		if (err < 0) {
			nft_chain_release_hook(&hook);
			kfree(basechain);
			return err;
		}
	} else {
		if (flags & NFT_CHAIN_BASE)
			return -EINVAL;
		if (flags & NFT_CHAIN_HW_OFFLOAD)
			return -EOPNOTSUPP;

		chain = kzalloc(sizeof(*chain), GFP_KERNEL);
		if (chain == NULL)
			return -ENOMEM;

		chain->flags = flags;
	}
	ctx->chain = chain;

	INIT_LIST_HEAD(&chain->rules);
	chain->handle = nf_tables_alloc_handle(table);
	chain->table = table;

	if (nla[NFTA_CHAIN_NAME]) {
		chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
	} else {
		if (!(flags & NFT_CHAIN_BINDING)) {
			err = -EINVAL;
			goto err_destroy_chain;
		}

		snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
		chain->name = kstrdup(name, GFP_KERNEL);
	}

	if (!chain->name) {
		err = -ENOMEM;
		goto err_destroy_chain;
	}

	if (nla[NFTA_CHAIN_USERDATA]) {
		chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL);
		if (chain->udata == NULL) {
			err = -ENOMEM;
			goto err_destroy_chain;
		}
		chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
	}

	rules = nf_tables_chain_alloc_rules(chain, 0);
	if (!rules) {
		err = -ENOMEM;
		goto err_destroy_chain;
	}

	*rules = NULL;
	rcu_assign_pointer(chain->rules_gen_0, rules);
	rcu_assign_pointer(chain->rules_gen_1, rules);

	err = nf_tables_register_hook(net, table, chain);
	if (err < 0)
		goto err_destroy_chain;

	trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
	if (IS_ERR(trans)) {
		err = PTR_ERR(trans);
		goto err_unregister_hook;
	}

	nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
	if (nft_is_base_chain(chain))
		nft_trans_chain_policy(trans) = policy;

	err = nft_chain_add(table, chain);
	if (err < 0) {
		nft_trans_destroy(trans);
		goto err_unregister_hook;
	}

	table->use++;

	return 0;
err_unregister_hook:
	nf_tables_unregister_hook(net, table, chain);
err_destroy_chain:
	nf_tables_chain_destroy(ctx);

	return err;
}

static bool nft_hook_list_equal(struct list_head *hook_list1,
				struct list_head *hook_list2)
{
	struct nft_hook *hook;
	int n = 0, m = 0;

	n = 0;
	list_for_each_entry(hook, hook_list2, list) {
		if (!nft_hook_list_find(hook_list1, hook))
			return false;

		n++;
	}
	list_for_each_entry(hook, hook_list1, list)
		m++;

	return n == m;
}

static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
			      u32 flags, const struct nlattr *attr,
			      struct netlink_ext_ack *extack)
{
	const struct nlattr * const *nla = ctx->nla;
	struct nft_table *table = ctx->table;
	struct nft_chain *chain = ctx->chain;
	struct nft_base_chain *basechain;
	struct nft_stats *stats = NULL;
	struct nft_chain_hook hook;
	struct nf_hook_ops *ops;
	struct nft_trans *trans;
	int err;

	if (chain->flags ^ flags)
		return -EOPNOTSUPP;

	if (nla[NFTA_CHAIN_HOOK]) {
		if (!nft_is_base_chain(chain)) {
			NL_SET_BAD_ATTR(extack, attr);
			return -EEXIST;
		}
		err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
					   extack, false);
		if (err < 0)
			return err;

		basechain = nft_base_chain(chain);
		if (basechain->type != hook.type) {
			nft_chain_release_hook(&hook);
			NL_SET_BAD_ATTR(extack, attr);
			return -EEXIST;
		}

		if (nft_base_chain_netdev(ctx->family, hook.num)) {
			if (!nft_hook_list_equal(&basechain->hook_list,
						 &hook.list)) {
				nft_chain_release_hook(&hook);
				NL_SET_BAD_ATTR(extack, attr);
				return -EEXIST;
			}
		} else {
			ops = &basechain->ops;
			if (ops->hooknum != hook.num ||
			    ops->priority != hook.priority) {
				nft_chain_release_hook(&hook);
				NL_SET_BAD_ATTR(extack, attr);
				return -EEXIST;
			}
		}
		nft_chain_release_hook(&hook);
	}

	if (nla[NFTA_CHAIN_HANDLE] &&
	    nla[NFTA_CHAIN_NAME]) {
		struct nft_chain *chain2;

		chain2 = nft_chain_lookup(ctx->net, table,
					  nla[NFTA_CHAIN_NAME], genmask);
		if (!IS_ERR(chain2)) {
			NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
			return -EEXIST;
		}
	}

	if (nla[NFTA_CHAIN_COUNTERS]) {
		if (!nft_is_base_chain(chain))
			return -EOPNOTSUPP;

		stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
		if (IS_ERR(stats))
			return PTR_ERR(stats);
	}

	err = -ENOMEM;
	trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
				sizeof(struct nft_trans_chain));
	if (trans == NULL)
		goto err;

	nft_trans_chain_stats(trans) = stats;
	nft_trans_chain_update(trans) = true;

	if (nla[NFTA_CHAIN_POLICY])
		nft_trans_chain_policy(trans) = policy;
	else
		nft_trans_chain_policy(trans) = -1;

	if (nla[NFTA_CHAIN_HANDLE] &&
	    nla[NFTA_CHAIN_NAME]) {
		struct nftables_pernet *nft_net = nft_pernet(ctx->net);
		struct nft_trans *tmp;
		char *name;

		err = -ENOMEM;
		name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
		if (!name)
			goto err;

		err = -EEXIST;
		list_for_each_entry(tmp, &nft_net->commit_list, list) {
			if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
			    tmp->ctx.table == table &&
			    nft_trans_chain_update(tmp) &&
			    nft_trans_chain_name(tmp) &&
			    strcmp(name, nft_trans_chain_name(tmp)) == 0) {
				NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
				kfree(name);
				goto err;
			}
		}

		nft_trans_chain_name(trans) = name;
	}
	nft_trans_commit_list_add_tail(ctx->net, trans);

	return 0;
err:
	free_percpu(stats);
	kfree(trans);
	return err;
}

static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
					       const struct nlattr *nla)
{
	struct nftables_pernet *nft_net = nft_pernet(net);
	u32 id = ntohl(nla_get_be32(nla));
	struct nft_trans *trans;

	list_for_each_entry(trans, &nft_net->commit_list, list) {
		struct nft_chain *chain = trans->ctx.chain;

		if (trans->msg_type == NFT_MSG_NEWCHAIN &&
		    id == nft_trans_chain_id(trans))
			return chain;
	}
	return ERR_PTR(-ENOENT);
}

static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
			      const struct nlattr * const nla[])
{
	struct nftables_pernet *nft_net = nft_pernet(info->net);
	struct netlink_ext_ack *extack = info->extack;
	u8 genmask = nft_genmask_next(info->net);
	u8 family = info->nfmsg->nfgen_family;
	struct nft_chain *chain = NULL;
	struct net *net = info->net;
	const struct nlattr *attr;
	struct nft_table *table;
	u8 policy = NF_ACCEPT;
	struct nft_ctx ctx;
	u64 handle = 0;
	u32 flags = 0;

	lockdep_assert_held(&nft_net->commit_mutex);

	table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
				 NETLINK_CB(skb).portid);
	if (IS_ERR(table)) {
		NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
		return PTR_ERR(table);
	}

	chain = NULL;
	attr = nla[NFTA_CHAIN_NAME];

	if (nla[NFTA_CHAIN_HANDLE]) {
		handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
		chain = nft_chain_lookup_byhandle(table, handle, genmask);
		if (IS_ERR(chain)) {
			NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
			return PTR_ERR(chain);
		}
		attr = nla[NFTA_CHAIN_HANDLE];
	} else if (nla[NFTA_CHAIN_NAME]) {
		chain = nft_chain_lookup(net, table, attr, genmask);
		if (IS_ERR(chain)) {
			if (PTR_ERR(chain) != -ENOENT) {
				NL_SET_BAD_ATTR(extack, attr);
				return PTR_ERR(chain);
			}
			chain = NULL;
		}
	} else if (!nla[NFTA_CHAIN_ID]) {
		return -EINVAL;
	}

	if (nla[NFTA_CHAIN_POLICY]) {
		if (chain != NULL &&
		    !nft_is_base_chain(chain)) {
			NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
			return -EOPNOTSUPP;
		}

		if (chain == NULL &&
		    nla[NFTA_CHAIN_HOOK] == NULL) {
			NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
			return -EOPNOTSUPP;
		}

		policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
		switch (policy) {
		case NF_DROP:
		case NF_ACCEPT:
			break;
		default:
			return -EINVAL;
		}
	}

	if (nla[NFTA_CHAIN_FLAGS])
		flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
	else if (chain)
		flags = chain->flags;

	if (flags & ~NFT_CHAIN_FLAGS)
		return -EOPNOTSUPP;

	nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);

	if (chain != NULL) {
		if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
			NL_SET_BAD_ATTR(extack, attr);
			return -EEXIST;
		}
		if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
			return -EOPNOTSUPP;

		flags |= chain->flags & NFT_CHAIN_BASE;
		return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
					  extack);
	}

	return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
}

static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
			      const struct nlattr * const nla[])
{
	struct netlink_ext_ack *extack = info->extack;
	u8 genmask = nft_genmask_next(info->net);
	u8 family = info->nfmsg->nfgen_family;
	struct net *net = info->net;
	const struct nlattr *attr;
	struct nft_table *table;
	struct nft_chain *chain;
	struct nft_rule *rule;
	struct nft_ctx ctx;
	u64 handle;
	u32 use;
	int err;

	table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
				 NETLINK_CB(skb).portid);
	if (IS_ERR(table)) {
		NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
		return PTR_ERR(table);
	}

	if (nla[NFTA_CHAIN_HANDLE]) {
		attr = nla[NFTA_CHAIN_HANDLE];
		handle = be64_to_cpu(nla_get_be64(attr));
		chain = nft_chain_lookup_byhandle(table, handle, genmask);
	} else {
		attr = nla[NFTA_CHAIN_NAME];
		chain = nft_chain_lookup(net, table, attr, genmask);
	}
	if (IS_ERR(chain)) {
		NL_SET_BAD_ATTR(extack, attr);
		return PTR_ERR(chain);
	}

	if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
	    chain->use > 0)
		return -EBUSY;

	nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);

	use = chain->use;
	list_for_each_entry(rule, &chain->rules, list) {
		if (!nft_is_active_next(net, rule))
			continue;
		use--;

		err = nft_delrule(&ctx, rule);
		if (err < 0)
			return err;
	}

	/* There are rules and elements that are still holding references to us,
	 * we cannot do a recursive removal in this case.
	 */
	if (use > 0) {
		NL_SET_BAD_ATTR(extack, attr);
		return -EBUSY;
	}

	return nft_delchain(&ctx);
}

/*
 * Expressions
 */

/**
 *	nft_register_expr - register nf_tables expr type
 *	@type: expr type
 *
 *	Registers the expr type for use with nf_tables. Returns zero on
 *	success or a negative errno code otherwise.
 */
int nft_register_expr(struct nft_expr_type *type)
{
	nfnl_lock(NFNL_SUBSYS_NFTABLES);
	if (type->family == NFPROTO_UNSPEC)
		list_add_tail_rcu(&type->list, &nf_tables_expressions);
	else
		list_add_rcu(&type->list, &nf_tables_expressions);
	nfnl_unlock(NFNL_SUBSYS_NFTABLES);
	return 0;
}
EXPORT_SYMBOL_GPL(nft_register_expr);

/**
 *	nft_unregister_expr - unregister nf_tables expr type
 *	@type: expr type
 *
 * 	Unregisters the expr typefor use with nf_tables.
 */
void nft_unregister_expr(struct nft_expr_type *type)
{
	nfnl_lock(NFNL_SUBSYS_NFTABLES);
	list_del_rcu(&type->list);
	nfnl_unlock(NFNL_SUBSYS_NFTABLES);
}
EXPORT_SYMBOL_GPL(nft_unregister_expr);

static const struct nft_expr_type *__nft_expr_type_get(u8 family,
						       struct nlattr *nla)
{
	const struct nft_expr_type *type, *candidate = NULL;

	list_for_each_entry(type, &nf_tables_expressions, list) {
		if (!nla_strcmp(nla, type->name)) {
			if (!type->family && !candidate)
				candidate = type;
			else if (type->family == family)
				candidate = type;
		}
	}
	return candidate;
}

#ifdef CONFIG_MODULES
static int nft_expr_type_request_module(struct net *net, u8 family,
					struct nlattr *nla)
{
	if (nft_request_module(net, "nft-expr-%u-%.*s", family,
			       nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
		return -EAGAIN;

	return 0;
}
#endif

static const struct nft_expr_type *nft_expr_type_get(struct net *net,
						     u8 family,
						     struct nlattr *nla)
{
	const struct nft_expr_type *type;

	if (nla == NULL)
		return ERR_PTR(-EINVAL);

	type = __nft_expr_type_get(family, nla);
	if (type != NULL && try_module_get(type->owner))
		return type;

	lockdep_nfnl_nft_mutex_not_held();
#ifdef CONFIG_MODULES
	if (type == NULL) {
		if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
			return ERR_PTR(-EAGAIN);

		if (nft_request_module(net, "nft-expr-%.*s",
				       nla_len(nla),
				       (char *)nla_data(nla)) == -EAGAIN)
			return ERR_PTR(-EAGAIN);
	}
#endif
	return ERR_PTR(-ENOENT);
}

static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
	[NFTA_EXPR_NAME]	= { .type = NLA_STRING,
				    .len = NFT_MODULE_AUTOLOAD_LIMIT },
	[NFTA_EXPR_DATA]	= { .type = NLA_NESTED },
};

static int nf_tables_fill_expr_info(struct sk_buff *skb,
				    const struct nft_expr *expr)
{
	if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
		goto nla_put_failure;

	if (expr->ops->dump) {
		struct nlattr *data = nla_nest_start_noflag(skb,
							    NFTA_EXPR_DATA);
		if (data == NULL)
			goto nla_put_failure;
		if (expr->ops->dump(skb, expr) < 0)
			goto nla_put_failure;
		nla_nest_end(skb, data);
	}

	return skb->len;

nla_put_failure:
	return -1;
};

int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
		  const struct nft_expr *expr)
{
	struct nlattr *nest;

	nest = nla_nest_start_noflag(skb, attr);
	if (!nest)
		goto nla_put_failure;
	if (nf_tables_fill_expr_info(skb, expr) < 0)
		goto nla_put_failure;
	nla_nest_end(skb, nest);
	return 0;

nla_put_failure:
	return -1;
}

struct nft_expr_info {
	const struct nft_expr_ops	*ops;
	const struct nlattr		*attr;
	struct nlattr			*tb[NFT_EXPR_MAXATTR + 1];
};

static int nf_tables_expr_parse(const struct nft_ctx *ctx,
				const struct nlattr *nla,
				struct nft_expr_info *info)
{
	const struct nft_expr_type *type;
	const struct nft_expr_ops *ops;
	struct nlattr *tb[NFTA_EXPR_MAX + 1];
	int err;

	err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
					  nft_expr_policy, NULL);
	if (err < 0)
		return err;

	type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
	if (IS_ERR(type))
		return PTR_ERR(type);

	if (tb[NFTA_EXPR_DATA]) {
		err = nla_parse_nested_deprecated(info->tb, type->maxattr,
						  tb[NFTA_EXPR_DATA],
						  type->policy, NULL);
		if (err < 0)
			goto err1;
	} else
		memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));

	if (type->select_ops != NULL) {
		ops = type->select_ops(ctx,
				       (const struct nlattr * const *)info->tb);
		if (IS_ERR(ops)) {
			err = PTR_ERR(ops);
#ifdef CONFIG_MODULES
			if (err == -EAGAIN)
				if (nft_expr_type_request_module(ctx->net,
								 ctx->family,
								 tb[NFTA_EXPR_NAME]) != -EAGAIN)
					err = -ENOENT;
#endif
			goto err1;
		}
	} else
		ops = type->ops;

	info->attr = nla;
	info->ops = ops;

	return 0;

err1:
	module_put(type->owner);
	return err;
}

static int nf_tables_newexpr(const struct nft_ctx *ctx,
			     const struct nft_expr_info *expr_info,
			     struct nft_expr *expr)
{
	const struct nft_expr_ops *ops = expr_info->ops;
	int err;

	expr->ops = ops;
	if (ops->init) {
		err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
		if (err < 0)
			goto err1;
	}

	return 0;
err1:
	expr->ops = NULL;
	return err;
}

static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
				   struct nft_expr *expr)
{
	const struct nft_expr_type *type = expr->ops->type;

	if (expr->ops->destroy)
		expr->ops->destroy(ctx, expr);
	module_put(type->owner);
}

static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
				      const struct nlattr *nla)
{
	struct nft_expr_info expr_info;
	struct nft_expr *expr;
	struct module *owner;
	int err;

	err = nf_tables_expr_parse(ctx, nla, &expr_info);
	if (err < 0)
		goto err1;

	err = -ENOMEM;
	expr = kzalloc(expr_info.ops->size, GFP_KERNEL);
	if (expr == NULL)
		goto err2;

	err = nf_tables_newexpr(ctx, &expr_info, expr);
	if (err < 0)
		goto err3;

	return expr;
err3:
	kfree(expr);
err2:
	owner = expr_info.ops->type->owner;
	if (expr_info.ops->type->release_ops)
		expr_info.ops->type->release_ops(expr_info.ops);

	module_put(owner);
err1:
	return ERR_PTR(err);
}

int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
{
	int err;

	if (src->ops->clone) {
		dst->ops = src->ops;
		err = src->ops->clone(dst, src);
		if (err < 0)
			return err;
	} else {
		memcpy(dst, src, src->ops->size);
	}

	__module_get(src->ops->type->owner);

	return 0;
}

void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
{
	nf_tables_expr_destroy(ctx, expr);
	kfree(expr);
}

/*
 * Rules
 */

static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
					  u64 handle)
{
	struct nft_rule *rule;

	// FIXME: this sucks
	list_for_each_entry_rcu(rule, &chain->rules, list) {
		if (handle == rule->handle)
			return rule;
	}

	return ERR_PTR(-ENOENT);
}

static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
					const struct nlattr *nla)
{
	if (nla == NULL)
		return ERR_PTR(-EINVAL);

	return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
}

static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
	[NFTA_RULE_TABLE]	= { .type = NLA_STRING,
				    .len = NFT_TABLE_MAXNAMELEN - 1 },
	[NFTA_RULE_CHAIN]	= { .type = NLA_STRING,
				    .len = NFT_CHAIN_MAXNAMELEN - 1 },
	[NFTA_RULE_HANDLE]	= { .type = NLA_U64 },
	[NFTA_RULE_EXPRESSIONS]	= { .type = NLA_NESTED },
	[NFTA_RULE_COMPAT]	= { .type = NLA_NESTED },
	[NFTA_RULE_POSITION]	= { .type = NLA_U64 },
	[NFTA_RULE_USERDATA]	= { .type = NLA_BINARY,
				    .len = NFT_USERDATA_MAXLEN },
	[NFTA_RULE_ID]		= { .type = NLA_U32 },
	[NFTA_RULE_POSITION_ID]	= { .type = NLA_U32 },
	[NFTA_RULE_CHAIN_ID]	= { .type = NLA_U32 },
};

static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
				    u32 portid, u32 seq, int event,
				    u32 flags, int family,
				    const struct nft_table *table,
				    const struct nft_chain *chain,
				    const struct nft_rule *rule, u64 handle)
{
	struct nlmsghdr *nlh;
	const struct nft_expr *expr, *next;
	struct nlattr *list;
	u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);

	nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
			   nft_base_seq(net));
	if (!nlh)
		goto nla_put_failure;

	if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
		goto nla_put_failure;
	if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
		goto nla_put_failure;
	if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
			 NFTA_RULE_PAD))
		goto nla_put_failure;

	if (event != NFT_MSG_DELRULE && handle) {
		if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle),
				 NFTA_RULE_PAD))
			goto nla_put_failure;
	}

	if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
		nft_flow_rule_stats(chain, rule);

	list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
	if (list == NULL)
		goto nla_put_failure;
	nft_rule_for_each_expr(expr, next, rule) {
		if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
			goto nla_put_failure;
	}
	nla_nest_end(skb, list);

	if (rule->udata) {
		struct nft_userdata *udata = nft_userdata(rule);
		if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
			    udata->data) < 0)
			goto nla_put_failure;
	}

	nlmsg_end(skb, nlh);
	return 0;

nla_put_failure:
	nlmsg_trim(skb, nlh);
	return -1;
}

static void nf_tables_rule_notify(const struct nft_ctx *ctx,
				  const struct nft_rule *rule, int event)
{
	struct nftables_pernet *nft_net = nft_pernet(ctx->net);
	const struct nft_rule *prule;
	struct sk_buff *skb;
	u64 handle = 0;
	u16 flags = 0;
	int err;

	if (!ctx->report &&
	    !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
		return;

	skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
	if (skb == NULL)
		goto err;

	if (event == NFT_MSG_NEWRULE &&
	    !list_is_first(&rule->list, &ctx->chain->rules) &&
	    !list_is_last(&rule->list, &ctx->chain->rules)) {
		prule = list_prev_entry(rule, list);
		handle = prule->handle;
	}
	if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE))
		flags |= NLM_F_APPEND;
	if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
		flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);

	err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
				       event, flags, ctx->family, ctx->table,
				       ctx->chain, rule, handle);
	if (err < 0) {
		kfree_skb(skb);
		goto err;
	}

	nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
	return;
err:
	nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
}

struct nft_rule_dump_ctx {
	char *table;
	char *chain;
};

static int __nf_tables_dump_rules(struct sk_buff *skb,
				  unsigned int *idx,
				  struct netlink_callback *cb,
				  const struct nft_table *table,
				  const struct nft_chain *chain)
{
	struct net *net = sock_net(skb->sk);
	const struct nft_rule *rule, *prule;
	unsigned int s_idx = cb->args[0];
	u64 handle;

	prule = NULL;
	list_for_each_entry_rcu(rule, &chain->rules, list) {
		if (!nft_is_active(net, rule))
			goto cont_skip;
		if (*idx < s_idx)
			goto cont;
		if (*idx > s_idx) {
			memset(&cb->args[1], 0,
					sizeof(cb->args) - sizeof(cb->args[0]));
		}
		if (prule)
			handle = prule->handle;
		else
			handle = 0;

		if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
					cb->nlh->nlmsg_seq,
					NFT_MSG_NEWRULE,
					NLM_F_MULTI | NLM_F_APPEND,
					table->family,
					table, chain, rule, handle) < 0)
			return 1;

		nl_dump_check_consistent(cb, nlmsg_hdr(skb));
cont:
		prule = rule;
cont_skip:
		(*idx)++;
	}
	return 0;
}

static int nf_tables_dump_rules(struct sk_buff *skb,
				struct netlink_callback *cb)
{
	const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
	const struct nft_rule_dump_ctx *ctx = cb->data;
	struct nft_table *table;
	const struct nft_chain *chain;
	unsigned int idx = 0;
	struct net *net = sock_net(skb->sk);
	int family = nfmsg->nfgen_family;
	struct nftables_pernet *nft_net;

	rcu_read_lock();
	nft_net = nft_pernet(net);
	cb->seq = nft_net->base_seq;

	list_for_each_entry_rcu(table, &nft_net->tables, list) {
		if (family != NFPROTO_UNSPEC && family != table->family)
			continue;

		if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
			continue;

		if (ctx && ctx->table && ctx->chain) {
			struct rhlist_head *list, *tmp;

			list = rhltable_lookup(&table->chains_ht, ctx->chain,
					       nft_chain_ht_params);
			if (!list)
				goto done;

			rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
				if (!nft_is_active(net, chain))
					continue;
				__nf_tables_dump_rules(skb, &idx,
						       cb, table, chain);
				break;
			}
			goto done;
		}

		list_for_each_entry_rcu(chain, &table->chains, list) {
			if (__nf_tables_dump_rules(skb, &idx, cb, table, chain))
				goto done;
		}

		if (ctx && ctx->table)
			break;
	}
done:
	rcu_read_unlock();

	cb->args[0] = idx;
	return skb->len;
}

static int nf_tables_dump_rules_start(struct netlink_callback *cb)
{
	const struct nlattr * const *nla = cb->data;
	struct nft_rule_dump_ctx *ctx = NULL;

	if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
		ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
		if (!ctx)
			return -ENOMEM;

		if (nla[NFTA_RULE_TABLE]) {
			ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
							GFP_ATOMIC);
			if (!ctx->table) {
				kfree(ctx);
				return -ENOMEM;
			}
		}
		if (nla[NFTA_RULE_CHAIN]) {
			ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
						GFP_ATOMIC);
			if (!ctx->chain) {
				kfree(ctx->table);
				kfree(ctx);
				return -ENOMEM;
			}
		}
	}

	cb->data = ctx;
	return 0;
}

static int nf_tables_dump_rules_done(struct netlink_callback *cb)
{
	struct nft_rule_dump_ctx *ctx = cb->data;

	if (ctx) {
		kfree(ctx->table);
		kfree(ctx->chain);
		kfree(ctx);
	}
	return 0;
}

/* called with rcu_read_lock held */
static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
			     const struct nlattr * const nla[])
{
	struct netlink_ext_ack *extack = info->extack;
	u8 genmask = nft_genmask_cur(info->net);
	u8 family = info->nfmsg->nfgen_family;
	const struct nft_chain *chain;
	const struct nft_rule *rule;
	struct net *net = info->net;
	struct nft_table *table;
	struct sk_buff *skb2;
	int err;

	if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
		struct netlink_dump_control c = {
			.start= nf_tables_dump_rules_start,
			.dump = nf_tables_dump_rules,
			.done = nf_tables_dump_rules_done,
			.module = THIS_MODULE,
			.data = (void *)nla,
		};

		return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
	}

	table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
	if (IS_ERR(table)) {
		NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
		return PTR_ERR(table);
	}

	chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
	if (IS_ERR(chain)) {
		NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
		return PTR_ERR(chain);
	}

	rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
	if (IS_ERR(rule)) {
		NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
		return PTR_ERR(rule);
	}

	skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
	if (!skb2)
		return -ENOMEM;

	err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
				       info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
				       family, table, chain, rule, 0);
	if (err < 0)
		goto err_fill_rule_info;

	return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);

err_fill_rule_info:
	kfree_skb(skb2);
	return err;
}

static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
				   struct nft_rule *rule)
{
	struct nft_expr *expr, *next;

	/*
	 * Careful: some expressions might not be initialized in case this
	 * is called on error from nf_tables_newrule().
	 */
	expr = nft_expr_first(rule);
	while (nft_expr_more(rule, expr)) {
		next = nft_expr_next(expr);
		nf_tables_expr_destroy(ctx, expr);
		expr = next;
	}
	kfree(rule);
}

void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
{
	nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
	nf_tables_rule_destroy(ctx, rule);
}

int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
{
	struct nft_expr *expr, *last;
	const struct nft_data *data;
	struct nft_rule *rule;
	int err;

	if (ctx->level == NFT_JUMP_STACK_SIZE)
		return -EMLINK;

	list_for_each_entry(rule, &chain->rules, list) {
		if (!nft_is_active_next(ctx->net, rule))
			continue;

		nft_rule_for_each_expr(expr, last, rule) {
			if (!expr->ops->validate)
				continue;

			err = expr->ops->validate(ctx, expr, &data);
			if (err < 0)
				return err;
		}
	}

	return 0;
}
EXPORT_SYMBOL_GPL(nft_chain_validate);

static int nft_table_validate(struct net *net, const struct nft_table *table)
{
	struct nft_chain *chain;
	struct nft_ctx ctx = {
		.net	= net,
		.family	= table->family,
	};
	int err;

	list_for_each_entry(chain, &table->chains, list) {
		if (!nft_is_base_chain(chain))
			continue;

		ctx.chain = chain;
		err = nft_chain_validate(&ctx, chain);
		if (err < 0)
			return err;
	}

	return 0;
}

static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
					     const struct nlattr *nla);

#define NFT_RULE_MAXEXPRS	128

static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
			     const struct nlattr * const nla[])
{
	struct nftables_pernet *nft_net = nft_pernet(info->net);
	struct netlink_ext_ack *extack = info->extack;
	unsigned int size, i, n, ulen = 0, usize = 0;
	u8 genmask = nft_genmask_next(info->net);
	struct nft_rule *rule, *old_rule = NULL;
	struct nft_expr_info *expr_info = NULL;
	u8 family = info->nfmsg->nfgen_family;
	struct nft_flow_rule *flow = NULL;
	struct net *net = info->net;
	struct nft_userdata *udata;
	struct nft_table *table;
	struct nft_chain *chain;
	struct nft_trans *trans;
	u64 handle, pos_handle;
	struct nft_expr *expr;
	struct nft_ctx ctx;
	struct nlattr *tmp;
	int err, rem;

	lockdep_assert_held(&nft_net->commit_mutex);

	table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
				 NETLINK_CB(skb).portid);
	if (IS_ERR(table)) {
		NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
		return PTR_ERR(table);
	}

	if (nla[NFTA_RULE_CHAIN]) {
		chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
					 genmask);
		if (IS_ERR(chain)) {
			NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
			return PTR_ERR(chain);
		}
		if (nft_chain_is_bound(chain))
			return -EOPNOTSUPP;

	} else if (nla[NFTA_RULE_CHAIN_ID]) {
		chain = nft_chain_lookup_byid(net, nla[NFTA_RULE_CHAIN_ID]);
		if (IS_ERR(chain)) {
			NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
			return PTR_ERR(chain);
		}
	} else {
		return -EINVAL;
	}

	if (nla[NFTA_RULE_HANDLE]) {
		handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
		rule = __nft_rule_lookup(chain, handle);
		if (IS_ERR(rule)) {
			NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
			return PTR_ERR(rule);
		}

		if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
			NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
			return -EEXIST;
		}
		if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
			old_rule = rule;
		else
			return -EOPNOTSUPP;
	} else {
		if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
		    info->nlh->nlmsg_flags & NLM_F_REPLACE)
			return -EINVAL;
		handle = nf_tables_alloc_handle(table);

		if (chain->use == UINT_MAX)
			return -EOVERFLOW;

		if (nla[NFTA_RULE_POSITION]) {
			pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
			old_rule = __nft_rule_lookup(chain, pos_handle);
			if (IS_ERR(old_rule)) {
				NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
				return PTR_ERR(old_rule);
			}
		} else if (nla[NFTA_RULE_POSITION_ID]) {
			old_rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_POSITION_ID]);
			if (IS_ERR(old_rule)) {
				NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
				return PTR_ERR(old_rule);
			}
		}
	}

	nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);

	n = 0;
	size = 0;
	if (nla[NFTA_RULE_EXPRESSIONS]) {
		expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
					   sizeof(struct nft_expr_info),
					   GFP_KERNEL);
		if (!expr_info)
			return -ENOMEM;

		nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
			err = -EINVAL;
			if (nla_type(tmp) != NFTA_LIST_ELEM)
				goto err_release_expr;
			if (n == NFT_RULE_MAXEXPRS)
				goto err_release_expr;
			err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
			if (err < 0) {
				NL_SET_BAD_ATTR(extack, tmp);
				goto err_release_expr;
			}
			size += expr_info[n].ops->size;
			n++;
		}
	}
	/* Check for overflow of dlen field */
	err = -EFBIG;
	if (size >= 1 << 12)
		goto err_release_expr;

	if (nla[NFTA_RULE_USERDATA]) {
		ulen = nla_len(nla[NFTA_RULE_USERDATA]);
		if (ulen > 0)
			usize = sizeof(struct nft_userdata) + ulen;
	}

	err = -ENOMEM;
	rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
	if (rule == NULL)
		goto err_release_expr;

	nft_activate_next(net, rule);

	rule->handle = handle;
	rule->dlen   = size;
	rule->udata  = ulen ? 1 : 0;

	if (ulen) {
		udata = nft_userdata(rule);
		udata->len = ulen - 1;
		nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
	}

	expr = nft_expr_first(rule);
	for (i = 0; i < n; i++) {
		err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
		if (err < 0) {
			NL_SET_BAD_ATTR(extack, expr_info[i].attr);
			goto err_release_rule;
		}

		if (expr_info[i].ops->validate)
			nft_validate_state_update(net, NFT_VALIDATE_NEED);

		expr_info[i].ops = NULL;
		expr = nft_expr_next(expr);
	}

	if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
		flow = nft_flow_rule_create(net, rule);
		if (IS_ERR(flow)) {
			err = PTR_ERR(flow);
			goto err_release_rule;
		}
	}

	if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
		err = nft_delrule(&ctx, old_rule);
		if (err < 0)
			goto err_destroy_flow_rule;

		trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
		if (trans == NULL) {
			err = -ENOMEM;
			goto err_destroy_flow_rule;
		}
		list_add_tail_rcu(&rule->list, &old_rule->list);
	} else {
		trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
		if (!trans) {
			err = -ENOMEM;
			goto err_destroy_flow_rule;
		}

		if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
			if (old_rule)
				list_add_rcu(&rule->list, &old_rule->list);
			else
				list_add_tail_rcu(&rule->list, &chain->rules);
		 } else {
			if (old_rule)
				list_add_tail_rcu(&rule->list, &old_rule->list);
			else
				list_add_rcu(&rule->list, &chain->rules);
		}
	}
	kvfree(expr_info);
	chain->use++;

	if (flow)
		nft_trans_flow_rule(trans) = flow;

	if (nft_net->validate_state == NFT_VALIDATE_DO)
		return nft_table_validate(net, table);

	return 0;

err_destroy_flow_rule:
	if (flow)
		nft_flow_rule_destroy(flow);
err_release_rule:
	nf_tables_rule_release(&ctx, rule);
err_release_expr:
	for (i = 0; i < n; i++) {
		if (expr_info[i].ops) {
			module_put(expr_info[i].ops->type->owner);
			if (expr_info[i].ops->type->release_ops)
				expr_info[i].ops->type->release_ops(expr_info[i].ops);
		}
	}
	kvfree(expr_info);

	return err;
}

static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
					     const struct nlattr *nla)
{
	struct nftables_pernet *nft_net = nft_pernet(net);
	u32 id = ntohl(nla_get_be32(nla));
	struct nft_trans *trans;

	list_for_each_entry(trans, &nft_net->commit_list, list) {
		struct nft_rule *rule = nft_trans_rule(trans);

		if (trans->msg_type == NFT_MSG_NEWRULE &&
		    id == nft_trans_rule_id(trans))
			return rule;
	}
	return ERR_PTR(-ENOENT);
}

static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
			     const struct nlattr * const nla[])
{
	struct netlink_ext_ack *extack = info->extack;
	u8 genmask = nft_genmask_next(info->net);
	u8 family = info->nfmsg->nfgen_family;
	struct nft_chain *chain = NULL;
	struct net *net = info->net;
	struct nft_table *table;
	struct nft_rule *rule;
	struct nft_ctx ctx;
	int err = 0;

	table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
				 NETLINK_CB(skb).portid);
	if (IS_ERR(table)) {
		NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
		return PTR_ERR(table);
	}

	if (nla[NFTA_RULE_CHAIN]) {
		chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
					 genmask);
		if (IS_ERR(chain)) {
			NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
			return PTR_ERR(chain);
		}
		if (nft_chain_is_bound(chain))
			return -EOPNOTSUPP;
	}

	nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);

	if (chain) {
		if (nla[NFTA_RULE_HANDLE]) {
			rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
			if (IS_ERR(rule)) {
				NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
				return PTR_ERR(rule);
			}

			err = nft_delrule(&ctx, rule);
		} else if (nla[NFTA_RULE_ID]) {
			rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
			if (IS_ERR(rule)) {
				NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
				return PTR_ERR(rule);
			}

			err = nft_delrule(&ctx, rule);
		} else {
			err = nft_delrule_by_chain(&ctx);
		}
	} else {
		list_for_each_entry(chain, &table->chains, list) {
			if (!nft_is_active_next(net, chain))
				continue;

			ctx.chain = chain;
			err = nft_delrule_by_chain(&ctx);
			if (err < 0)
				break;
		}
	}

	return err;
}

/*
 * Sets
 */
static const struct nft_set_type *nft_set_types[] = {
	&nft_set_hash_fast_type,
	&nft_set_hash_type,
	&nft_set_rhash_type,
	&nft_set_bitmap_type,
	&nft_set_rbtree_type,
#if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
	&nft_set_pipapo_avx2_type,
#endif
	&nft_set_pipapo_type,
};

#define NFT_SET_FEATURES	(NFT_SET_INTERVAL | NFT_SET_MAP | \
				 NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
				 NFT_SET_EVAL)

static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
{
	return (flags & type->features) == (flags & NFT_SET_FEATURES);
}

/*
 * Select a set implementation based on the data characteristics and the
 * given policy. The total memory use might not be known if no size is
 * given, in that case the amount of memory per element is used.
 */
static const struct nft_set_ops *
nft_select_set_ops(const struct nft_ctx *ctx,
		   const struct nlattr * const nla[],
		   const struct nft_set_desc *desc,
		   enum nft_set_policies policy)
{
	struct nftables_pernet *nft_net = nft_pernet(ctx->net);
	const struct nft_set_ops *ops, *bops;
	struct nft_set_estimate est, best;
	const struct nft_set_type *type;
	u32 flags = 0;
	int i;

	lockdep_assert_held(&nft_net->commit_mutex);
	lockdep_nfnl_nft_mutex_not_held();

	if (nla[NFTA_SET_FLAGS] != NULL)
		flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));

	bops	    = NULL;
	best.size   = ~0;
	best.lookup = ~0;
	best.space  = ~0;

	for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
		type = nft_set_types[i];
		ops = &type->ops;

		if (!nft_set_ops_candidate(type, flags))
			continue;
		if (!ops->estimate(desc, flags, &est))
			continue;

		switch (policy) {
		case NFT_SET_POL_PERFORMANCE:
			if (est.lookup < best.lookup)
				break;
			if (est.lookup == best.lookup &&
			    est.space < best.space)
				break;
			continue;
		case NFT_SET_POL_MEMORY:
			if (!desc->size) {
				if (est.space < best.space)
					break;
				if (est.space == best.space &&
				    est.lookup < best.lookup)
					break;
			} else if (est.size < best.size || !bops) {
				break;
			}
			continue;
		default:
			break;
		}

		bops = ops;
		best = est;
	}

	if (bops != NULL)
		return bops;

	return ERR_PTR(-EOPNOTSUPP);
}

static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
	[NFTA_SET_TABLE]		= { .type = NLA_STRING,
					    .len = NFT_TABLE_MAXNAMELEN - 1 },
	[NFTA_SET_NAME]			= { .type = NLA_STRING,
					    .len = NFT_SET_MAXNAMELEN - 1 },
	[NFTA_SET_FLAGS]		= { .type = NLA_U32 },
	[NFTA_SET_KEY_TYPE]		= { .type = NLA_U32 },
	[NFTA_SET_KEY_LEN]		= { .type = NLA_U32 },
	[NFTA_SET_DATA_TYPE]		= { .type = NLA_U32 },
	[NFTA_SET_DATA_LEN]		= { .type = NLA_U32 },
	[NFTA_SET_POLICY]		= { .type = NLA_U32 },
	[NFTA_SET_DESC]			= { .type = NLA_NESTED },
	[NFTA_SET_ID]			= { .type = NLA_U32 },
	[NFTA_SET_TIMEOUT]		= { .type = NLA_U64 },
	[NFTA_SET_GC_INTERVAL]		= { .type = NLA_U32 },
	[NFTA_SET_USERDATA]		= { .type = NLA_BINARY,
					    .len  = NFT_USERDATA_MAXLEN },
	[NFTA_SET_OBJ_TYPE]		= { .type = NLA_U32 },
	[NFTA_SET_HANDLE]		= { .type = NLA_U64 },
	[NFTA_SET_EXPR]			= { .type = NLA_NESTED },
	[NFTA_SET_EXPRESSIONS]		= { .type = NLA_NESTED },
};

static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
	[NFTA_SET_DESC_SIZE]		= { .type = NLA_U32 },
	[NFTA_SET_DESC_CONCAT]		= { .type = NLA_NESTED },
};

static struct nft_set *nft_set_lookup(const struct nft_table *table,
				      const struct nlattr *nla, u8 genmask)
{
	struct nft_set *set;

	if (nla == NULL)
		return ERR_PTR(-EINVAL);

	list_for_each_entry_rcu(set, &table->sets, list) {
		if (!nla_strcmp(nla, set->name) &&
		    nft_active_genmask(set, genmask))
			return set;
	}
	return ERR_PTR(-ENOENT);
}

static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
					       const struct nlattr *nla,
					       u8 genmask)
{
	struct nft_set *set;

	list_for_each_entry(set, &table->sets, list) {
		if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
		    nft_active_genmask(set, genmask))
			return set;
	}
	return ERR_PTR(-ENOENT);
}

static struct nft_set *nft_set_lookup_byid(const struct net *net,
					   const struct nlattr *nla, u8 genmask)
{
	struct nftables_pernet *nft_net = nft_pernet(net);
	u32 id = ntohl(nla_get_be32(nla));
	struct nft_trans *trans;

	list_for_each_entry(trans, &nft_net->commit_list, list) {
		if (trans->msg_type == NFT_MSG_NEWSET) {
			struct nft_set *set = nft_trans_set(trans);

			if (id == nft_trans_set_id(trans) &&
			    nft_active_genmask(set, genmask))
				return set;
		}
	}
	return ERR_PTR(-ENOENT);
}

struct nft_set *nft_set_lookup_global(const struct net *net,
				      const struct nft_table *table,
				      const struct nlattr *nla_set_name,
				      const struct nlattr *nla_set_id,
				      u8 genmask)
{
	struct nft_set *set;

	set = nft_set_lookup(table, nla_set_name, genmask);
	if (IS_ERR(set)) {
		if (!nla_set_id)
			return set;

		set = nft_set_lookup_byid(net, nla_set_id, genmask);
	}
	return set;
}
EXPORT_SYMBOL_GPL(nft_set_lookup_global);

static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
				    const char *name)
{
	const struct nft_set *i;
	const char *p;
	unsigned long *inuse;
	unsigned int n = 0, min = 0;

	p = strchr(name, '%');
	if (p != NULL) {
		if (p[1] != 'd' || strchr(p + 2, '%'))
			return -EINVAL;

		inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
		if (inuse == NULL)
			return -ENOMEM;
cont:
		list_for_each_entry(i, &ctx->table->sets, list) {
			int tmp;

			if (!nft_is_active_next(ctx->net, set))
				continue;
			if (!sscanf(i->name, name, &tmp))
				continue;
			if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
				continue;

			set_bit(tmp - min, inuse);
		}

		n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
		if (n >= BITS_PER_BYTE * PAGE_SIZE) {
			min += BITS_PER_BYTE * PAGE_SIZE;
			memset(inuse, 0, PAGE_SIZE);
			goto cont;
		}
		free_page((unsigned long)inuse);
	}

	set->name = kasprintf(GFP_KERNEL, name, min + n);
	if (!set->name)
		return -ENOMEM;

	list_for_each_entry(i, &ctx->table->sets, list) {
		if (!nft_is_active_next(ctx->net, i))
			continue;
		if (!strcmp(set->name, i->name)) {
			kfree(set->name);
			set->name = NULL;
			return -ENFILE;
		}
	}
	return 0;
}

int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
{
	u64 ms = be64_to_cpu(nla_get_be64(nla));
	u64 max = (u64)(~((u64)0));

	max = div_u64(max, NSEC_PER_MSEC);
	if (ms >= max)
		return -ERANGE;

	ms *= NSEC_PER_MSEC;
	*result = nsecs_to_jiffies64(ms);
	return 0;
}

__be64 nf_jiffies64_to_msecs(u64 input)
{
	return cpu_to_be64(jiffies64_to_msecs(input));
}

static int nf_tables_fill_set_concat(struct sk_buff *skb,
				     const struct nft_set *set)
{
	struct nlattr *concat, *field;
	int i;

	concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
	if (!concat)
		return -ENOMEM;

	for (i = 0; i < set->field_count; i++) {
		field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
		if (!field)
			return -ENOMEM;

		if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
				 htonl(set->field_len[i])))
			return -ENOMEM;

		nla_nest_end(skb, field);
	}

	nla_nest_end(skb, concat);

	return 0;
}

static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
			      const struct nft_set *set, u16 event, u16 flags)
{
	struct nlmsghdr *nlh;
	u32 portid = ctx->portid;
	struct nlattr *nest;
	u32 seq = ctx->seq;
	int i;

	event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
	nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
			   NFNETLINK_V0, nft_base_seq(ctx->net));
	if (!nlh)
		goto nla_put_failure;

	if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
		goto nla_put_failure;
	if (nla_put_string(skb, NFTA_SET_NAME, set->name))
		goto nla_put_failure;
	if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
			 NFTA_SET_PAD))
		goto nla_put_failure;
	if (set->flags != 0)
		if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
			goto nla_put_failure;

	if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
		goto nla_put_failure;
	if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
		goto nla_put_failure;
	if (set->flags & NFT_SET_MAP) {
		if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
			goto nla_put_failure;
		if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
			goto nla_put_failure;
	}
	if (set->flags & NFT_SET_OBJECT &&
	    nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
		goto nla_put_failure;

	if (set->timeout &&
	    nla_put_be64(skb, NFTA_SET_TIMEOUT,
			 nf_jiffies64_to_msecs(set->timeout),
			 NFTA_SET_PAD))
		goto nla_put_failure;
	if (set->gc_int &&
	    nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
		goto nla_put_failure;

	if (set->policy != NFT_SET_POL_PERFORMANCE) {
		if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
			goto nla_put_failure;
	}

	if (set->udata &&
	    nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
		goto nla_put_failure;

	nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
	if (!nest)
		goto nla_put_failure;
	if (set->size &&
	    nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
		goto nla_put_failure;

	if (set->field_count > 1 &&
	    nf_tables_fill_set_concat(skb, set))
		goto nla_put_failure;

	nla_nest_end(skb, nest);

	if (set->num_exprs == 1) {
		nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
		if (nf_tables_fill_expr_info(skb, set->exprs[0]) < 0)
			goto nla_put_failure;

		nla_nest_end(skb, nest);
	} else if (set->num_exprs > 1) {
		nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
		if (nest == NULL)
			goto nla_put_failure;

		for (i = 0; i < set->num_exprs; i++) {
			if (nft_expr_dump(skb, NFTA_LIST_ELEM,
					  set->exprs[i]) < 0)
				goto nla_put_failure;
		}
		nla_nest_end(skb, nest);
	}

	nlmsg_end(skb, nlh);
	return 0;

nla_put_failure:
	nlmsg_trim(skb, nlh);
	return -1;
}

static void nf_tables_set_notify(const struct nft_ctx *ctx,
				 const struct nft_set *set, int event,
			         gfp_t gfp_flags)
{
	struct nftables_pernet *nft_net = nft_pernet(ctx->net);
	u32 portid = ctx->portid;
	struct sk_buff *skb;
	u16 flags = 0;
	int err;

	if (!ctx->report &&
	    !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
		return;

	skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
	if (skb == NULL)
		goto err;

	if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
		flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);

	err = nf_tables_fill_set(skb, ctx, set, event, flags);
	if (err < 0) {
		kfree_skb(skb);
		goto err;
	}

	nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
	return;
err:
	nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
}

static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
{
	const struct nft_set *set;
	unsigned int idx, s_idx = cb->args[0];
	struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
	struct net *net = sock_net(skb->sk);
	struct nft_ctx *ctx = cb->data, ctx_set;
	struct nftables_pernet *nft_net;

	if (cb->args[1])
		return skb->len;

	rcu_read_lock();
	nft_net = nft_pernet(net);
	cb->seq = nft_net->base_seq;

	list_for_each_entry_rcu(table, &nft_net->tables, list) {
		if (ctx->family != NFPROTO_UNSPEC &&
		    ctx->family != table->family)
			continue;

		if (ctx->table && ctx->table != table)
			continue;

		if (cur_table) {
			if (cur_table != table)
				continue;

			cur_table = NULL;
		}
		idx = 0;
		list_for_each_entry_rcu(set, &table->sets, list) {
			if (idx < s_idx)
				goto cont;
			if (!nft_is_active(net, set))
				goto cont;

			ctx_set = *ctx;
			ctx_set.table = table;
			ctx_set.family = table->family;

			if (nf_tables_fill_set(skb, &ctx_set, set,
					       NFT_MSG_NEWSET,
					       NLM_F_MULTI) < 0) {
				cb->args[0] = idx;
				cb->args[2] = (unsigned long) table;
				goto done;
			}
			nl_dump_check_consistent(cb, nlmsg_hdr(skb));
cont:
			idx++;
		}
		if (s_idx)
			s_idx = 0;
	}
	cb->args[1] = 1;
done:
	rcu_read_unlock();
	return skb->len;
}

static int nf_tables_dump_sets_start(struct netlink_callback *cb)
{
	struct nft_ctx *ctx_dump = NULL;

	ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
	if (ctx_dump == NULL)
		return -ENOMEM;

	cb->data = ctx_dump;
	return 0;
}

static int nf_tables_dump_sets_done(struct netlink_callback *cb)
{
	kfree(cb->data);
	return 0;
}

/* called with rcu_read_lock held */
static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
			    const struct nlattr * const nla[])
{
	struct netlink_ext_ack *extack = info->extack;
	u8 genmask = nft_genmask_cur(info->net);
	u8 family = info->nfmsg->nfgen_family;
	struct nft_table *table = NULL;
	struct net *net = info->net;
	const struct nft_set *set;
	struct sk_buff *skb2;
	struct nft_ctx ctx;
	int err;

	if (nla[NFTA_SET_TABLE]) {
		table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
					 genmask, 0);
		if (IS_ERR(table)) {
			NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
			return PTR_ERR(table);
		}
	}

	nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);

	if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
		struct netlink_dump_control c = {
			.start = nf_tables_dump_sets_start,
			.dump = nf_tables_dump_sets,
			.done = nf_tables_dump_sets_done,
			.data = &ctx,
			.module = THIS_MODULE,
		};

		return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
	}

	/* Only accept unspec with dump */
	if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
		return -EAFNOSUPPORT;
	if (!nla[NFTA_SET_TABLE])
		return -EINVAL;

	set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
	if (IS_ERR(set))
		return PTR_ERR(set);

	skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
	if (skb2 == NULL)
		return -ENOMEM;

	err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
	if (err < 0)
		goto err_fill_set_info;

	return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);

err_fill_set_info:
	kfree_skb(skb2);
	return err;
}

static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
	[NFTA_SET_FIELD_LEN]	= { .type = NLA_U32 },
};

static int nft_set_desc_concat_parse(const struct nlattr *attr,
				     struct nft_set_desc *desc)
{
	struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
	u32 len;
	int err;

	err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
					  nft_concat_policy, NULL);
	if (err < 0)
		return err;

	if (!tb[NFTA_SET_FIELD_LEN])
		return -EINVAL;

	len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));

	if (len * BITS_PER_BYTE / 32 > NFT_REG32_COUNT)
		return -E2BIG;

	desc->field_len[desc->field_count++] = len;

	return 0;
}

static int nft_set_desc_concat(struct nft_set_desc *desc,
			       const struct nlattr *nla)
{
	struct nlattr *attr;
	int rem, err;

	nla_for_each_nested(attr, nla, rem) {
		if (nla_type(attr) != NFTA_LIST_ELEM)
			return -EINVAL;

		err = nft_set_desc_concat_parse(attr, desc);
		if (err < 0)
			return err;
	}

	return 0;
}

static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
				    const struct nlattr *nla)
{
	struct nlattr *da[NFTA_SET_DESC_MAX + 1];
	int err;

	err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
					  nft_set_desc_policy, NULL);
	if (err < 0)
		return err;

	if (da[NFTA_SET_DESC_SIZE] != NULL)
		desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
	if (da[NFTA_SET_DESC_CONCAT])
		err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);

	return err;
}

static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
			    const struct nlattr * const nla[])
{
	u32 ktype, dtype, flags, policy, gc_int, objtype;
	struct netlink_ext_ack *extack = info->extack;
	u8 genmask = nft_genmask_next(info->net);
	u8 family = info->nfmsg->nfgen_family;
	const struct nft_set_ops *ops;
	struct nft_expr *expr = NULL;
	struct net *net = info->net;
	struct nft_set_desc desc;
	struct nft_table *table;
	unsigned char *udata;
	struct nft_set *set;
	struct nft_ctx ctx;
	size_t alloc_size;
	u64 timeout;
	char *name;
	int err, i;
	u16 udlen;
	u64 size;

	if (nla[NFTA_SET_TABLE] == NULL ||
	    nla[NFTA_SET_NAME] == NULL ||
	    nla[NFTA_SET_KEY_LEN] == NULL ||
	    nla[NFTA_SET_ID] == NULL)
		return -EINVAL;

	memset(&desc, 0, sizeof(desc));

	ktype = NFT_DATA_VALUE;
	if (nla[NFTA_SET_KEY_TYPE] != NULL) {
		ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
		if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
			return -EINVAL;
	}

	desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
	if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
		return -EINVAL;

	flags = 0;
	if (nla[NFTA_SET_FLAGS] != NULL) {
		flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
		if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
			      NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
			      NFT_SET_MAP | NFT_SET_EVAL |
			      NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
			return -EOPNOTSUPP;
		/* Only one of these operations is supported */
		if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
			     (NFT_SET_MAP | NFT_SET_OBJECT))
			return -EOPNOTSUPP;
		if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
			     (NFT_SET_EVAL | NFT_SET_OBJECT))
			return -EOPNOTSUPP;
	}

	dtype = 0;
	if (nla[NFTA_SET_DATA_TYPE] != NULL) {
		if (!(flags & NFT_SET_MAP))
			return -EINVAL;

		dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
		if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
		    dtype != NFT_DATA_VERDICT)
			return -EINVAL;

		if (dtype != NFT_DATA_VERDICT) {
			if (nla[NFTA_SET_DATA_LEN] == NULL)
				return -EINVAL;
			desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
			if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
				return -EINVAL;
		} else
			desc.dlen = sizeof(struct nft_verdict);
	} else if (flags & NFT_SET_MAP)
		return -EINVAL;

	if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
		if (!(flags & NFT_SET_OBJECT))
			return -EINVAL;

		objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
		if (objtype == NFT_OBJECT_UNSPEC ||
		    objtype > NFT_OBJECT_MAX)
			return -EOPNOTSUPP;
	} else if (flags & NFT_SET_OBJECT)
		return -EINVAL;
	else
		objtype = NFT_OBJECT_UNSPEC;

	timeout = 0;
	if (nla[NFTA_SET_TIMEOUT] != NULL) {
		if (!(flags & NFT_SET_TIMEOUT))
			return -EINVAL;

		err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout);
		if (err)
			return err;
	}
	gc_int = 0;
	if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
		if (!(flags & NFT_SET_TIMEOUT))
			return -EINVAL;
		gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
	}

	policy = NFT_SET_POL_PERFORMANCE;
	if (nla[NFTA_SET_POLICY] != NULL)
		policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));

	if (nla[NFTA_SET_DESC] != NULL) {
		err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
		if (err < 0)
			return err;
	}

	if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
		desc.expr = true;

	table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
				 NETLINK_CB(skb).portid);
	if (IS_ERR(table)) {
		NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
		return PTR_ERR(table);
	}

	nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);

	set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
	if (IS_ERR(set)) {
		if (PTR_ERR(set) != -ENOENT) {
			NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
			return PTR_ERR(set);
		}
	} else {
		if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
			NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
			return -EEXIST;
		}
		if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
			return -EOPNOTSUPP;

		return 0;
	}

	if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
		return -ENOENT;

	ops = nft_select_set_ops(&ctx, nla, &desc, policy);
	if (IS_ERR(ops))
		return PTR_ERR(ops);

	udlen = 0;
	if (nla[NFTA_SET_USERDATA])
		udlen = nla_len(nla[NFTA_SET_USERDATA]);

	size = 0;
	if (ops->privsize != NULL)
		size = ops->privsize(nla, &desc);
	alloc_size = sizeof(*set) + size + udlen;
	if (alloc_size < size || alloc_size > INT_MAX)
		return -ENOMEM;
	set = kvzalloc(alloc_size, GFP_KERNEL);
	if (!set)
		return -ENOMEM;

	name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL);
	if (!name) {
		err = -ENOMEM;
		goto err_set_name;
	}

	err = nf_tables_set_alloc_name(&ctx, set, name);
	kfree(name);
	if (err < 0)
		goto err_set_name;

	udata = NULL;
	if (udlen) {
		udata = set->data + size;
		nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
	}

	INIT_LIST_HEAD(&set->bindings);
	INIT_LIST_HEAD(&set->catchall_list);
	set->table = table;
	write_pnet(&set->net, net);
	set->ops = ops;
	set->ktype = ktype;
	set->klen = desc.klen;
	set->dtype = dtype;
	set->objtype = objtype;
	set->dlen = desc.dlen;
	set->flags = flags;
	set->size = desc.size;
	set->policy = policy;
	set->udlen = udlen;
	set->udata = udata;
	set->timeout = timeout;
	set->gc_int = gc_int;

	set->field_count = desc.field_count;
	for (i = 0; i < desc.field_count; i++)
		set->field_len[i] = desc.field_len[i];

	err = ops->init(set, &desc, nla);
	if (err < 0)
		goto err_set_init;

	if (nla[NFTA_SET_EXPR]) {
		expr = nft_set_elem_expr_alloc(&ctx, set, nla[NFTA_SET_EXPR]);
		if (IS_ERR(expr)) {
			err = PTR_ERR(expr);
			goto err_set_expr_alloc;
		}
		set->exprs[0] = expr;
		set->num_exprs++;
	} else if (nla[NFTA_SET_EXPRESSIONS]) {
		struct nft_expr *expr;
		struct nlattr *tmp;
		int left;

		if (!(flags & NFT_SET_EXPR)) {
			err = -EINVAL;
			goto err_set_expr_alloc;
		}
		i = 0;
		nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
			if (i == NFT_SET_EXPR_MAX) {
				err = -E2BIG;
				goto err_set_expr_alloc;
			}
			if (nla_type(tmp) != NFTA_LIST_ELEM) {
				err = -EINVAL;
				goto err_set_expr_alloc;
			}
			expr = nft_set_elem_expr_alloc(&ctx, set, tmp);
			if (IS_ERR(expr)) {
				err = PTR_ERR(expr);
				goto err_set_expr_alloc;
			}
			set->exprs[i++] = expr;
			set->num_exprs++;
		}
	}

	set->handle = nf_tables_alloc_handle(table);

	err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
	if (err < 0)
		goto err_set_expr_alloc;

	list_add_tail_rcu(&set->list, &table->sets);
	table->use++;
	return 0;

err_set_expr_alloc:
	for (i = 0; i < set->num_exprs; i++)
		nft_expr_destroy(&ctx, set->exprs[i]);

	ops->destroy(set);
err_set_init:
	kfree(set->name);
err_set_name:
	kvfree(set);
	return err;
}

struct nft_set_elem_catchall {
	struct list_head	list;
	struct rcu_head		rcu;
	void			*elem;
};

static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
				     struct nft_set *set)
{
	struct nft_set_elem_catchall *catchall;

	list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
		list_del_rcu(&catchall->list);
		nft_set_elem_destroy(set, catchall->elem, true);
		kfree_rcu(catchall);
	}
}

static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
{
	int i;

	if (WARN_ON(set->use > 0))
		return;

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

	set->ops->destroy(set);
	nft_set_catchall_destroy(ctx, set);
	kfree(set->name);
	kvfree(set);
}

static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
			    const struct nlattr * const nla[])
{
	struct netlink_ext_ack *extack = info->extack;
	u8 genmask = nft_genmask_next(info->net);
	u8 family = info->nfmsg->nfgen_family;
	struct net *net = info->net;
	const struct nlattr *attr;
	struct nft_table *table;
	struct nft_set *set;
	struct nft_ctx ctx;

	if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
		return -EAFNOSUPPORT;

	table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
				 genmask, NETLINK_CB(skb).portid);
	if (IS_ERR(table)) {
		NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
		return PTR_ERR(table);
	}

	if (nla[NFTA_SET_HANDLE]) {
		attr = nla[NFTA_SET_HANDLE];
		set = nft_set_lookup_byhandle(table, attr, genmask);
	} else {
		attr = nla[NFTA_SET_NAME];
		set = nft_set_lookup(table, attr, genmask);
	}

	if (IS_ERR(set)) {
		NL_SET_BAD_ATTR(extack, attr);
		return PTR_ERR(set);
	}
	if (set->use ||
	    (info->nlh->nlmsg_flags & NLM_F_NONREC &&
	     atomic_read(&set->nelems) > 0)) {
		NL_SET_BAD_ATTR(extack, attr);
		return -EBUSY;
	}

	nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);

	return nft_delset(&ctx, set);
}

static int nft_validate_register_store(const struct nft_ctx *ctx,
				       enum nft_registers reg,
				       const struct nft_data *data,
				       enum nft_data_types type,
				       unsigned int len);

static int nft_setelem_data_validate(const struct nft_ctx *ctx,
				     struct nft_set *set,
				     struct nft_set_elem *elem)
{
	const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
	enum nft_registers dreg;

	dreg = nft_type_to_reg(set->dtype);
	return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
					   set->dtype == NFT_DATA_VERDICT ?
					   NFT_DATA_VERDICT : NFT_DATA_VALUE,
					   set->dlen);
}

static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
					struct nft_set *set,
					const struct nft_set_iter *iter,
					struct nft_set_elem *elem)
{
	return nft_setelem_data_validate(ctx, set, elem);
}

static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
				       struct nft_set *set)
{
	u8 genmask = nft_genmask_next(ctx->net);
	struct nft_set_elem_catchall *catchall;
	struct nft_set_elem elem;
	struct nft_set_ext *ext;
	int ret = 0;

	list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
		ext = nft_set_elem_ext(set, catchall->elem);
		if (!nft_set_elem_active(ext, genmask))
			continue;

		elem.priv = catchall->elem;
		ret = nft_setelem_data_validate(ctx, set, &elem);
		if (ret < 0)
			break;
	}

	return ret;
}

int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
		       struct nft_set_binding *binding)
{
	struct nft_set_binding *i;
	struct nft_set_iter iter;

	if (set->use == UINT_MAX)
		return -EOVERFLOW;

	if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
		return -EBUSY;

	if (binding->flags & NFT_SET_MAP) {
		/* If the set is already bound to the same chain all
		 * jumps are already validated for that chain.
		 */
		list_for_each_entry(i, &set->bindings, list) {
			if (i->flags & NFT_SET_MAP &&
			    i->chain == binding->chain)
				goto bind;
		}

		iter.genmask	= nft_genmask_next(ctx->net);
		iter.skip 	= 0;
		iter.count	= 0;
		iter.err	= 0;
		iter.fn		= nf_tables_bind_check_setelem;

		set->ops->walk(ctx, set, &iter);
		if (!iter.err)
			iter.err = nft_set_catchall_bind_check(ctx, set);

		if (iter.err < 0)
			return iter.err;
	}
bind:
	binding->chain = ctx->chain;
	list_add_tail_rcu(&binding->list, &set->bindings);
	nft_set_trans_bind(ctx, set);
	set->use++;

	return 0;
}
EXPORT_SYMBOL_GPL(nf_tables_bind_set);

static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
				 struct nft_set_binding *binding, bool event)
{
	list_del_rcu(&binding->list);

	if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
		list_del_rcu(&set->list);
		if (event)
			nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
					     GFP_KERNEL);
	}
}

void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
			      struct nft_set_binding *binding,
			      enum nft_trans_phase phase)
{
	switch (phase) {
	case NFT_TRANS_PREPARE:
		set->use--;
		return;
	case NFT_TRANS_ABORT:
	case NFT_TRANS_RELEASE:
		set->use--;
		fallthrough;
	default:
		nf_tables_unbind_set(ctx, set, binding,
				     phase == NFT_TRANS_COMMIT);
	}
}
EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);

void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
{
	if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
		nft_set_destroy(ctx, set);
}
EXPORT_SYMBOL_GPL(nf_tables_destroy_set);

const struct nft_set_ext_type nft_set_ext_types[] = {
	[NFT_SET_EXT_KEY]		= {
		.align	= __alignof__(u32),
	},
	[NFT_SET_EXT_DATA]		= {
		.align	= __alignof__(u32),
	},
	[NFT_SET_EXT_EXPRESSIONS]	= {
		.align	= __alignof__(struct nft_set_elem_expr),
	},
	[NFT_SET_EXT_OBJREF]		= {
		.len	= sizeof(struct nft_object *),
		.align	= __alignof__(struct nft_object *),
	},
	[NFT_SET_EXT_FLAGS]		= {
		.len	= sizeof(u8),
		.align	= __alignof__(u8),
	},
	[NFT_SET_EXT_TIMEOUT]		= {
		.len	= sizeof(u64),
		.align	= __alignof__(u64),
	},
	[NFT_SET_EXT_EXPIRATION]	= {
		.len	= sizeof(u64),
		.align	= __alignof__(u64),
	},
	[NFT_SET_EXT_USERDATA]		= {
		.len	= sizeof(struct nft_userdata),
		.align	= __alignof__(struct nft_userdata),
	},
	[NFT_SET_EXT_KEY_END]		= {
		.align	= __alignof__(u32),
	},
};

/*
 * Set elements
 */

static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
	[NFTA_SET_ELEM_KEY]		= { .type = NLA_NESTED },
	[NFTA_SET_ELEM_DATA]		= { .type = NLA_NESTED },
	[NFTA_SET_ELEM_FLAGS]		= { .type = NLA_U32 },
	[NFTA_SET_ELEM_TIMEOUT]		= { .type = NLA_U64 },
	[NFTA_SET_ELEM_EXPIRATION]	= { .type = NLA_U64 },
	[NFTA_SET_ELEM_USERDATA]	= { .type = NLA_BINARY,
					    .len = NFT_USERDATA_MAXLEN },
	[NFTA_SET_ELEM_EXPR]		= { .type = NLA_NESTED },
	[NFTA_SET_ELEM_OBJREF]		= { .type = NLA_STRING,
					    .len = NFT_OBJ_MAXNAMELEN - 1 },
	[NFTA_SET_ELEM_KEY_END]		= { .type = NLA_NESTED },
	[NFTA_SET_ELEM_EXPRESSIONS]	= { .type = NLA_NESTED },
};

static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
	[NFTA_SET_ELEM_LIST_TABLE]	= { .type = NLA_STRING,
					    .len = NFT_TABLE_MAXNAMELEN - 1 },
	[NFTA_SET_ELEM_LIST_SET]	= { .type = NLA_STRING,
					    .len = NFT_SET_MAXNAMELEN - 1 },
	[NFTA_SET_ELEM_LIST_ELEMENTS]	= { .type = NLA_NESTED },
	[NFTA_SET_ELEM_LIST_SET_ID]	= { .type = NLA_U32 },
};

static int nft_set_elem_expr_dump(struct sk_buff *skb,
				  const struct nft_set *set,
				  const struct nft_set_ext *ext)
{
	struct nft_set_elem_expr *elem_expr;
	u32 size, num_exprs = 0;
	struct nft_expr *expr;
	struct nlattr *nest;

	elem_expr = nft_set_ext_expr(ext);
	nft_setelem_expr_foreach(expr, elem_expr, size)
		num_exprs++;

	if (num_exprs == 1) {
		expr = nft_setelem_expr_at(elem_expr, 0);
		if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr) < 0)
			return -1;

		return 0;
	} else if (num_exprs > 1) {
		nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
		if (nest == NULL)
			goto nla_put_failure;

		nft_setelem_expr_foreach(expr, elem_expr, size) {
			expr = nft_setelem_expr_at(elem_expr, size);
			if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
				goto nla_put_failure;
		}
		nla_nest_end(skb, nest);
	}
	return 0;

nla_put_failure:
	return -1;
}

static int nf_tables_fill_setelem(struct sk_buff *skb,
				  const struct nft_set *set,
				  const struct nft_set_elem *elem)
{
	const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
	unsigned char *b = skb_tail_pointer(skb);
	struct nlattr *nest;

	nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
	if (nest == NULL)
		goto nla_put_failure;

	if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
	    nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
			  NFT_DATA_VALUE, set->klen) < 0)
		goto nla_put_failure;

	if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
	    nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
			  NFT_DATA_VALUE, set->klen) < 0)
		goto nla_put_failure;

	if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
	    nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
			  set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
			  set->dlen) < 0)
		goto nla_put_failure;

	if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
	    nft_set_elem_expr_dump(skb, set, ext))
		goto nla_put_failure;

	if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
	    nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
			   (*nft_set_ext_obj(ext))->key.name) < 0)
		goto nla_put_failure;

	if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
	    nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
		         htonl(*nft_set_ext_flags(ext))))
		goto nla_put_failure;

	if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
	    nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
			 nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
			 NFTA_SET_ELEM_PAD))
		goto nla_put_failure;

	if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
		u64 expires, now = get_jiffies_64();

		expires = *nft_set_ext_expiration(ext);
		if (time_before64(now, expires))
			expires -= now;
		else
			expires = 0;

		if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
				 nf_jiffies64_to_msecs(expires),
				 NFTA_SET_ELEM_PAD))
			goto nla_put_failure;
	}

	if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
		struct nft_userdata *udata;

		udata = nft_set_ext_userdata(ext);
		if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
			    udata->len + 1, udata->data))
			goto nla_put_failure;
	}

	nla_nest_end(skb, nest);
	return 0;

nla_put_failure:
	nlmsg_trim(skb, b);
	return -EMSGSIZE;
}

struct nft_set_dump_args {
	const struct netlink_callback	*cb;
	struct nft_set_iter		iter;
	struct sk_buff			*skb;
};

static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
				  struct nft_set *set,
				  const struct nft_set_iter *iter,
				  struct nft_set_elem *elem)
{
	struct nft_set_dump_args *args;

	args = container_of(iter, struct nft_set_dump_args, iter);
	return nf_tables_fill_setelem(args->skb, set, elem);
}

struct nft_set_dump_ctx {
	const struct nft_set	*set;
	struct nft_ctx		ctx;
};

static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
				 const struct nft_set *set)
{
	struct nft_set_elem_catchall *catchall;
	u8 genmask = nft_genmask_cur(net);
	struct nft_set_elem elem;
	struct nft_set_ext *ext;
	int ret = 0;

	list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
		ext = nft_set_elem_ext(set, catchall->elem);
		if (!nft_set_elem_active(ext, genmask) ||
		    nft_set_elem_expired(ext))
			continue;

		elem.priv = catchall->elem;
		ret = nf_tables_fill_setelem(skb, set, &elem);
		break;
	}

	return ret;
}

static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
{
	struct nft_set_dump_ctx *dump_ctx = cb->data;
	struct net *net = sock_net(skb->sk);
	struct nftables_pernet *nft_net;
	struct nft_table *table;
	struct nft_set *set;
	struct nft_set_dump_args args;
	bool set_found = false;
	struct nlmsghdr *nlh;
	struct nlattr *nest;
	u32 portid, seq;
	int event;

	rcu_read_lock();
	nft_net = nft_pernet(net);
	list_for_each_entry_rcu(table, &nft_net->tables, list) {
		if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
		    dump_ctx->ctx.family != table->family)
			continue;

		if (table != dump_ctx->ctx.table)
			continue;

		list_for_each_entry_rcu(set, &table->sets, list) {
			if (set == dump_ctx->set) {
				set_found = true;
				break;
			}
		}
		break;
	}

	if (!set_found) {
		rcu_read_unlock();
		return -ENOENT;
	}

	event  = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
	portid = NETLINK_CB(cb->skb).portid;
	seq    = cb->nlh->nlmsg_seq;

	nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
			   table->family, NFNETLINK_V0, nft_base_seq(net));
	if (!nlh)
		goto nla_put_failure;

	if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
		goto nla_put_failure;
	if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
		goto nla_put_failure;

	nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
	if (nest == NULL)
		goto nla_put_failure;

	args.cb			= cb;
	args.skb		= skb;
	args.iter.genmask	= nft_genmask_cur(net);
	args.iter.skip		= cb->args[0];
	args.iter.count		= 0;
	args.iter.err		= 0;
	args.iter.fn		= nf_tables_dump_setelem;
	set->ops->walk(&dump_ctx->ctx, set, &args.iter);

	if (!args.iter.err && args.iter.count == cb->args[0])
		args.iter.err = nft_set_catchall_dump(net, skb, set);
	rcu_read_unlock();

	nla_nest_end(skb, nest);
	nlmsg_end(skb, nlh);

	if (args.iter.err && args.iter.err != -EMSGSIZE)
		return args.iter.err;
	if (args.iter.count == cb->args[0])
		return 0;

	cb->args[0] = args.iter.count;
	return skb->len;

nla_put_failure:
	rcu_read_unlock();
	return -ENOSPC;
}

static int nf_tables_dump_set_start(struct netlink_callback *cb)
{
	struct nft_set_dump_ctx *dump_ctx = cb->data;

	cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);

	return cb->data ? 0 : -ENOMEM;
}

static int nf_tables_dump_set_done(struct netlink_callback *cb)
{
	kfree(cb->data);
	return 0;
}

static int nf_tables_fill_setelem_info(struct sk_buff *skb,
				       const struct nft_ctx *ctx, u32 seq,
				       u32 portid, int event, u16 flags,
				       const struct nft_set *set,
				       const struct nft_set_elem *elem)
{
	struct nlmsghdr *nlh;
	struct nlattr *nest;
	int err;

	event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
	nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
			   NFNETLINK_V0, nft_base_seq(ctx->net));
	if (!nlh)
		goto nla_put_failure;

	if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
		goto nla_put_failure;
	if (nla_put_string(skb, NFTA_SET_NAME, set->name))
		goto nla_put_failure;

	nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
	if (nest == NULL)
		goto nla_put_failure;

	err = nf_tables_fill_setelem(skb, set, elem);
	if (err < 0)
		goto nla_put_failure;

	nla_nest_end(skb, nest);

	nlmsg_end(skb, nlh);
	return 0;

nla_put_failure:
	nlmsg_trim(skb, nlh);
	return -1;
}

static int nft_setelem_parse_flags(const struct nft_set *set,
				   const struct nlattr *attr, u32 *flags)
{
	if (attr == NULL)
		return 0;

	*flags = ntohl(nla_get_be32(attr));
	if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
		return -EOPNOTSUPP;
	if (!(set->flags & NFT_SET_INTERVAL) &&
	    *flags & NFT_SET_ELEM_INTERVAL_END)
		return -EINVAL;

	return 0;
}

static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
				 struct nft_data *key, struct nlattr *attr)
{
	struct nft_data_desc desc;
	int err;

	err = nft_data_init(ctx, key, NFT_DATA_VALUE_MAXLEN, &desc, attr);
	if (err < 0)
		return err;

	if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) {
		nft_data_release(key, desc.type);
		return -EINVAL;
	}

	return 0;
}

static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
				  struct nft_data_desc *desc,
				  struct nft_data *data,
				  struct nlattr *attr)
{
	int err;

	err = nft_data_init(ctx, data, NFT_DATA_VALUE_MAXLEN, desc, attr);
	if (err < 0)
		return err;

	if (desc->type != NFT_DATA_VERDICT && desc->len != set->dlen) {
		nft_data_release(data, desc->type);
		return -EINVAL;
	}

	return 0;
}

static void *nft_setelem_catchall_get(const struct net *net,
				      const struct nft_set *set)
{
	struct nft_set_elem_catchall *catchall;
	u8 genmask = nft_genmask_cur(net);
	struct nft_set_ext *ext;
	void *priv = NULL;

	list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
		ext = nft_set_elem_ext(set, catchall->elem);
		if (!nft_set_elem_active(ext, genmask) ||
		    nft_set_elem_expired(ext))
			continue;

		priv = catchall->elem;
		break;
	}

	return priv;
}

static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set,
			   struct nft_set_elem *elem, u32 flags)
{
	void *priv;

	if (!(flags & NFT_SET_ELEM_CATCHALL)) {
		priv = set->ops->get(ctx->net, set, elem, flags);
		if (IS_ERR(priv))
			return PTR_ERR(priv);
	} else {
		priv = nft_setelem_catchall_get(ctx->net, set);
		if (!priv)
			return -ENOENT;
	}
	elem->priv = priv;

	return 0;
}

static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
			    const struct nlattr *attr)
{
	struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
	struct nft_set_elem elem;
	struct sk_buff *skb;
	uint32_t flags = 0;
	int err;

	err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
					  nft_set_elem_policy, NULL);
	if (err < 0)
		return err;

	err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
	if (err < 0)
		return err;

	if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
		return -EINVAL;

	if (nla[NFTA_SET_ELEM_KEY]) {
		err = nft_setelem_parse_key(ctx, set, &elem.key.val,
					    nla[NFTA_SET_ELEM_KEY]);
		if (err < 0)
			return err;
	}

	if (nla[NFTA_SET_ELEM_KEY_END]) {
		err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
					    nla[NFTA_SET_ELEM_KEY_END]);
		if (err < 0)
			return err;
	}

	err = nft_setelem_get(ctx, set, &elem, flags);
	if (err < 0)
		return err;

	err = -ENOMEM;
	skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
	if (skb == NULL)
		return err;

	err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
					  NFT_MSG_NEWSETELEM, 0, set, &elem);
	if (err < 0)
		goto err_fill_setelem;

	return nfnetlink_unicast(skb, ctx->net, ctx->portid);

err_fill_setelem:
	kfree_skb(skb);
	return err;
}

/* called with rcu_read_lock held */
static int nf_tables_getsetelem(struct sk_buff *skb,
				const struct nfnl_info *info,
				const struct nlattr * const nla[])
{
	struct netlink_ext_ack *extack = info->extack;
	u8 genmask = nft_genmask_cur(info->net);
	u8 family = info->nfmsg->nfgen_family;
	struct net *net = info->net;
	struct nft_table *table;
	struct nft_set *set;
	struct nlattr *attr;
	struct nft_ctx ctx;
	int rem, err = 0;

	table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
				 genmask, NETLINK_CB(skb).portid);
	if (IS_ERR(table)) {
		NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
		return PTR_ERR(table);
	}

	set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
	if (IS_ERR(set))
		return PTR_ERR(set);

	nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);

	if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
		struct netlink_dump_control c = {
			.start = nf_tables_dump_set_start,
			.dump = nf_tables_dump_set,
			.done = nf_tables_dump_set_done,
			.module = THIS_MODULE,
		};
		struct nft_set_dump_ctx dump_ctx = {
			.set = set,
			.ctx = ctx,
		};

		c.data = &dump_ctx;
		return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
	}

	if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
		return -EINVAL;

	nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
		err = nft_get_set_elem(&ctx, set, attr);
		if (err < 0)
			break;
	}

	return err;
}

static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
				     const struct nft_set *set,
				     const struct nft_set_elem *elem,
				     int event)
{
	struct nftables_pernet *nft_net;
	struct net *net = ctx->net;
	u32 portid = ctx->portid;
	struct sk_buff *skb;
	u16 flags = 0;
	int err;

	if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
		return;

	skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
	if (skb == NULL)
		goto err;

	if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
		flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);

	err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
					  set, elem);
	if (err < 0) {
		kfree_skb(skb);
		goto err;
	}

	nft_net = nft_pernet(net);
	nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
	return;
err:
	nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
}

static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
					      int msg_type,
					      struct nft_set *set)
{
	struct nft_trans *trans;

	trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
	if (trans == NULL)
		return NULL;

	nft_trans_elem_set(trans) = set;
	return trans;
}

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

	expr = nft_expr_init(ctx, attr);
	if (IS_ERR(expr))
		return expr;

	err = -EOPNOTSUPP;
	if (!(expr->ops->type->flags & NFT_EXPR_STATEFUL))
		goto err_set_elem_expr;

	if (expr->ops->type->flags & NFT_EXPR_GC) {
		if (set->flags & NFT_SET_TIMEOUT)
			goto err_set_elem_expr;
		if (!set->ops->gc_init)
			goto err_set_elem_expr;
		set->ops->gc_init(set);
	}

	return expr;

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

void *nft_set_elem_init(const struct nft_set *set,
			const struct nft_set_ext_tmpl *tmpl,
			const u32 *key, const u32 *key_end,
			const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
{
	struct nft_set_ext *ext;
	void *elem;

	elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
	if (elem == NULL)
		return NULL;

	ext = nft_set_elem_ext(set, elem);
	nft_set_ext_init(ext, tmpl);

	if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY))
		memcpy(nft_set_ext_key(ext), key, set->klen);
	if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END))
		memcpy(nft_set_ext_key_end(ext), key_end, set->klen);
	if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
		memcpy(nft_set_ext_data(ext), data, set->dlen);
	if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
		*nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
		if (expiration == 0)
			*nft_set_ext_expiration(ext) += timeout;
	}
	if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
		*nft_set_ext_timeout(ext) = timeout;

	return elem;
}

static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
					struct nft_expr *expr)
{
	if (expr->ops->destroy_clone) {
		expr->ops->destroy_clone(ctx, expr);
		module_put(expr->ops->type->owner);
	} else {
		nf_tables_expr_destroy(ctx, expr);
	}
}

static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
				      struct nft_set_elem_expr *elem_expr)
{
	struct nft_expr *expr;
	u32 size;

	nft_setelem_expr_foreach(expr, elem_expr, size)
		__nft_set_elem_expr_destroy(ctx, expr);
}

void nft_set_elem_destroy(const struct nft_set *set, void *elem,
			  bool destroy_expr)
{
	struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
	struct nft_ctx ctx = {
		.net	= read_pnet(&set->net),
		.family	= set->table->family,
	};

	nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
	if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
		nft_data_release(nft_set_ext_data(ext), set->dtype);
	if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
		nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));

	if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
		(*nft_set_ext_obj(ext))->use--;
	kfree(elem);
}
EXPORT_SYMBOL_GPL(nft_set_elem_destroy);

/* Only called from commit path, nft_setelem_data_deactivate() already deals
 * with the refcounting from the preparation phase.
 */
static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
				       const struct nft_set *set, void *elem)
{
	struct nft_set_ext *ext = nft_set_elem_ext(set, elem);

	if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
		nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));

	kfree(elem);
}

int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
			    struct nft_expr *expr_array[])
{
	struct nft_expr *expr;
	int err, i, k;

	for (i = 0; i < set->num_exprs; i++) {
		expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL);
		if (!expr)
			goto err_expr;

		err = nft_expr_clone(expr, set->exprs[i]);
		if (err < 0) {
			nft_expr_destroy(ctx, expr);
			goto err_expr;
		}
		expr_array[i] = expr;
	}

	return 0;

err_expr:
	for (k = i - 1; k >= 0; k--)
		nft_expr_destroy(ctx, expr_array[k]);

	return -ENOMEM;
}

static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
				   const struct nft_set_ext *ext,
				   struct nft_expr *expr_array[],
				   u32 num_exprs)
{
	struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
	struct nft_expr *expr;
	int i, err;

	for (i = 0; i < num_exprs; i++) {
		expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
		err = nft_expr_clone(expr, expr_array[i]);
		if (err < 0)
			goto err_elem_expr_setup;

		elem_expr->size += expr_array[i]->ops->size;
		nft_expr_destroy(ctx, expr_array[i]);
		expr_array[i] = NULL;
	}

	return 0;

err_elem_expr_setup:
	for (; i < num_exprs; i++) {
		nft_expr_destroy(ctx, expr_array[i]);
		expr_array[i] = NULL;
	}

	return -ENOMEM;
}

struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
					    const struct nft_set *set)
{
	struct nft_set_elem_catchall *catchall;
	u8 genmask = nft_genmask_cur(net);
	struct nft_set_ext *ext;

	list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
		ext = nft_set_elem_ext(set, catchall->elem);
		if (nft_set_elem_active(ext, genmask) &&
		    !nft_set_elem_expired(ext))
			return ext;
	}

	return NULL;
}
EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);

void *nft_set_catchall_gc(const struct nft_set *set)
{
	struct nft_set_elem_catchall *catchall, *next;
	struct nft_set_ext *ext;
	void *elem = NULL;

	list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
		ext = nft_set_elem_ext(set, catchall->elem);

		if (!nft_set_elem_expired(ext) ||
		    nft_set_elem_mark_busy(ext))
			continue;

		elem = catchall->elem;
		list_del_rcu(&catchall->list);
		kfree_rcu(catchall, rcu);
		break;
	}

	return elem;
}
EXPORT_SYMBOL_GPL(nft_set_catchall_gc);

static int nft_setelem_catchall_insert(const struct net *net,
				       struct nft_set *set,
				       const struct nft_set_elem *elem,
				       struct nft_set_ext **pext)
{
	struct nft_set_elem_catchall *catchall;
	u8 genmask = nft_genmask_next(net);
	struct nft_set_ext *ext;

	list_for_each_entry(catchall, &set->catchall_list, list) {
		ext = nft_set_elem_ext(set, catchall->elem);
		if (nft_set_elem_active(ext, genmask)) {
			*pext = ext;
			return -EEXIST;
		}
	}

	catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
	if (!catchall)
		return -ENOMEM;

	catchall->elem = elem->priv;
	list_add_tail_rcu(&catchall->list, &set->catchall_list);

	return 0;
}

static int nft_setelem_insert(const struct net *net,
			      struct nft_set *set,
			      const struct nft_set_elem *elem,
			      struct nft_set_ext **ext, unsigned int flags)
{
	int ret;

	if (flags & NFT_SET_ELEM_CATCHALL)
		ret = nft_setelem_catchall_insert(net, set, elem, ext);
	else
		ret = set->ops->insert(net, set, elem, ext);

	return ret;
}

static bool nft_setelem_is_catchall(const struct nft_set *set,
				    const struct nft_set_elem *elem)
{
	struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);

	if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
	    *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
		return true;

	return false;
}

static void nft_setelem_activate(struct net *net, struct nft_set *set,
				 struct nft_set_elem *elem)
{
	struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);

	if (nft_setelem_is_catchall(set, elem)) {
		nft_set_elem_change_active(net, set, ext);
		nft_set_elem_clear_busy(ext);
	} else {
		set->ops->activate(net, set, elem);
	}
}

static int nft_setelem_catchall_deactivate(const struct net *net,
					   struct nft_set *set,
					   struct nft_set_elem *elem)
{
	struct nft_set_elem_catchall *catchall;
	struct nft_set_ext *ext;

	list_for_each_entry(catchall, &set->catchall_list, list) {
		ext = nft_set_elem_ext(set, catchall->elem);
		if (!nft_is_active(net, ext) ||
		    nft_set_elem_mark_busy(ext))
			continue;

		kfree(elem->priv);
		elem->priv = catchall->elem;
		nft_set_elem_change_active(net, set, ext);
		return 0;
	}

	return -ENOENT;
}

static int __nft_setelem_deactivate(const struct net *net,
				    struct nft_set *set,
				    struct nft_set_elem *elem)
{
	void *priv;

	priv = set->ops->deactivate(net, set, elem);
	if (!priv)
		return -ENOENT;

	kfree(elem->priv);
	elem->priv = priv;
	set->ndeact++;

	return 0;
}

static int nft_setelem_deactivate(const struct net *net,
				  struct nft_set *set,
				  struct nft_set_elem *elem, u32 flags)
{
	int ret;

	if (flags & NFT_SET_ELEM_CATCHALL)
		ret = nft_setelem_catchall_deactivate(net, set, elem);
	else
		ret = __nft_setelem_deactivate(net, set, elem);

	return ret;
}

static void nft_setelem_catchall_remove(const struct net *net,
					const struct nft_set *set,
					const struct nft_set_elem *elem)
{
	struct nft_set_elem_catchall *catchall, *next;

	list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
		if (catchall->elem == elem->priv) {
			list_del_rcu(&catchall->list);
			kfree_rcu(catchall);
			break;
		}
	}
}

static void nft_setelem_remove(const struct net *net,
			       const struct nft_set *set,
			       const struct nft_set_elem *elem)
{
	if (nft_setelem_is_catchall(set, elem))
		nft_setelem_catchall_remove(net, set, elem);
	else
		set->ops->remove(net, set, elem);
}

static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
			    const struct nlattr *attr, u32 nlmsg_flags)
{
	struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
	struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
	u8 genmask = nft_genmask_next(ctx->net);
	u32 flags = 0, size = 0, num_exprs = 0;
	struct nft_set_ext_tmpl tmpl;
	struct nft_set_ext *ext, *ext2;
	struct nft_set_elem elem;
	struct nft_set_binding *binding;
	struct nft_object *obj = NULL;
	struct nft_userdata *udata;
	struct nft_data_desc desc;
	enum nft_registers dreg;
	struct nft_trans *trans;
	u64 timeout;
	u64 expiration;
	int err, i;
	u8 ulen;

	err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
					  nft_set_elem_policy, NULL);
	if (err < 0)
		return err;

	nft_set_ext_prepare(&tmpl);

	err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
	if (err < 0)
		return err;

	if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
		return -EINVAL;

	if (flags != 0)
		nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);

	if (set->flags & NFT_SET_MAP) {
		if (nla[NFTA_SET_ELEM_DATA] == NULL &&
		    !(flags & NFT_SET_ELEM_INTERVAL_END))
			return -EINVAL;
	} else {
		if (nla[NFTA_SET_ELEM_DATA] != NULL)
			return -EINVAL;
	}

	if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
	     (nla[NFTA_SET_ELEM_DATA] ||
	      nla[NFTA_SET_ELEM_OBJREF] ||
	      nla[NFTA_SET_ELEM_TIMEOUT] ||
	      nla[NFTA_SET_ELEM_EXPIRATION] ||
	      nla[NFTA_SET_ELEM_USERDATA] ||
	      nla[NFTA_SET_ELEM_EXPR] ||
	      nla[NFTA_SET_ELEM_EXPRESSIONS]))
		return -EINVAL;

	timeout = 0;
	if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
		if (!(set->flags & NFT_SET_TIMEOUT))
			return -EINVAL;
		err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
					    &timeout);
		if (err)
			return err;
	} else if (set->flags & NFT_SET_TIMEOUT) {
		timeout = set->timeout;
	}

	expiration = 0;
	if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
		if (!(set->flags & NFT_SET_TIMEOUT))
			return -EINVAL;
		err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
					    &expiration);
		if (err)
			return err;
	}

	if (nla[NFTA_SET_ELEM_EXPR]) {
		struct nft_expr *expr;

		if (set->num_exprs && set->num_exprs != 1)
			return -EOPNOTSUPP;

		expr = nft_set_elem_expr_alloc(ctx, set,
					       nla[NFTA_SET_ELEM_EXPR]);
		if (IS_ERR(expr))
			return PTR_ERR(expr);

		expr_array[0] = expr;
		num_exprs = 1;

		if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
			err = -EOPNOTSUPP;
			goto err_set_elem_expr;
		}
	} else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
		struct nft_expr *expr;
		struct nlattr *tmp;
		int left;

		i = 0;
		nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
			if (i == NFT_SET_EXPR_MAX ||
			    (set->num_exprs && set->num_exprs == i)) {
				err = -E2BIG;
				goto err_set_elem_expr;
			}
			if (nla_type(tmp) != NFTA_LIST_ELEM) {
				err = -EINVAL;
				goto err_set_elem_expr;
			}
			expr = nft_set_elem_expr_alloc(ctx, set, tmp);
			if (IS_ERR(expr)) {
				err = PTR_ERR(expr);
				goto err_set_elem_expr;
			}
			expr_array[i] = expr;
			num_exprs++;

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

		num_exprs = set->num_exprs;
	}

	if (nla[NFTA_SET_ELEM_KEY]) {
		err = nft_setelem_parse_key(ctx, set, &elem.key.val,
					    nla[NFTA_SET_ELEM_KEY]);
		if (err < 0)
			goto err_set_elem_expr;

		nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
	}

	if (nla[NFTA_SET_ELEM_KEY_END]) {
		err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
					    nla[NFTA_SET_ELEM_KEY_END]);
		if (err < 0)
			goto err_parse_key;

		nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
	}

	if (timeout > 0) {
		nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
		if (timeout != set->timeout)
			nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
	}

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

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

	if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
		if (!(set->flags & NFT_SET_OBJECT)) {
			err = -EINVAL;
			goto err_parse_key_end;
		}
		obj = nft_obj_lookup(ctx->net, ctx->table,
				     nla[NFTA_SET_ELEM_OBJREF],
				     set->objtype, genmask);
		if (IS_ERR(obj)) {
			err = PTR_ERR(obj);
			goto err_parse_key_end;
		}
		nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
	}

	if (nla[NFTA_SET_ELEM_DATA] != NULL) {
		err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
					     nla[NFTA_SET_ELEM_DATA]);
		if (err < 0)
			goto err_parse_key_end;

		dreg = nft_type_to_reg(set->dtype);
		list_for_each_entry(binding, &set->bindings, list) {
			struct nft_ctx bind_ctx = {
				.net	= ctx->net,
				.family	= ctx->family,
				.table	= ctx->table,
				.chain	= (struct nft_chain *)binding->chain,
			};

			if (!(binding->flags & NFT_SET_MAP))
				continue;

			err = nft_validate_register_store(&bind_ctx, dreg,
							  &elem.data.val,
							  desc.type, desc.len);
			if (err < 0)
				goto err_parse_data;

			if (desc.type == NFT_DATA_VERDICT &&
			    (elem.data.val.verdict.code == NFT_GOTO ||
			     elem.data.val.verdict.code == NFT_JUMP))
				nft_validate_state_update(ctx->net,
							  NFT_VALIDATE_NEED);
		}

		nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
	}

	/* The full maximum length of userdata can exceed the maximum
	 * offset value (U8_MAX) for following extensions, therefor it
	 * must be the last extension added.
	 */
	ulen = 0;
	if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
		ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
		if (ulen > 0)
			nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
					       ulen);
	}

	err = -ENOMEM;
	elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
				      elem.key_end.val.data, elem.data.val.data,
				      timeout, expiration, GFP_KERNEL);
	if (elem.priv == NULL)
		goto err_parse_data;

	ext = nft_set_elem_ext(set, elem.priv);
	if (flags)
		*nft_set_ext_flags(ext) = flags;
	if (ulen > 0) {
		udata = nft_set_ext_userdata(ext);
		udata->len = ulen - 1;
		nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
	}
	if (obj) {
		*nft_set_ext_obj(ext) = obj;
		obj->use++;
	}
	err = nft_set_elem_expr_setup(ctx, ext, expr_array, num_exprs);
	if (err < 0)
		goto err_elem_expr;

	trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
	if (trans == NULL) {
		err = -ENOMEM;
		goto err_elem_expr;
	}

	ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;

	err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags);
	if (err) {
		if (err == -EEXIST) {
			if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
			    nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
			    nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
			    nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
				goto err_element_clash;
			if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
			     nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
			     memcmp(nft_set_ext_data(ext),
				    nft_set_ext_data(ext2), set->dlen) != 0) ||
			    (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
			     nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
			     *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
				goto err_element_clash;
			else if (!(nlmsg_flags & NLM_F_EXCL))
				err = 0;
		} else if (err == -ENOTEMPTY) {
			/* ENOTEMPTY reports overlapping between this element
			 * and an existing one.
			 */
			err = -EEXIST;
		}
		goto err_element_clash;
	}

	if (!(flags & NFT_SET_ELEM_CATCHALL) && set->size &&
	    !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
		err = -ENFILE;
		goto err_set_full;
	}

	nft_trans_elem(trans) = elem;
	nft_trans_commit_list_add_tail(ctx->net, trans);
	return 0;

err_set_full:
	nft_setelem_remove(ctx->net, set, &elem);
err_element_clash:
	kfree(trans);
err_elem_expr:
	if (obj)
		obj->use--;

	nf_tables_set_elem_destroy(ctx, set, elem.priv);
err_parse_data:
	if (nla[NFTA_SET_ELEM_DATA] != NULL)
		nft_data_release(&elem.data.val, desc.type);
err_parse_key_end:
	nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
err_parse_key:
	nft_data_release(&elem.key.