text: // 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-"))
  
  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,
  };
  
  static void nft_validate_state_update(struct net *net, u8 new_validate_state)
  {
  	switch (net->nft.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;
  	}
  
  	net->nft.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 net *net = ctx->net;
  	struct nft_trans *trans;
  
  	if (!nft_set_is_anonymous(set))
  		return;
  
  	list_for_each_entry_reverse(trans, &net->nft.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 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);
  
  	list_add_tail(&trans->list, &ctx->net->nft.commit_list);
  	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]));
  		}
  	}
  
  	list_add_tail(&trans->list, &ctx->net->nft.commit_list);
  	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;
  	list_add_tail(&trans->list, &ctx->net->nft.commit_list);
  
  	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;
  	list_add_tail(&trans->list, &ctx->net->nft.commit_list);
  
  	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;
  	list_add_tail(&trans->list, &ctx->net->nft.commit_list);
  
  	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;
  	list_add_tail(&trans->list, &ctx->net->nft.commit_list);
  
  	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)
  {
  	struct nft_table *table;
  
  	if (nla == NULL)
  		return ERR_PTR(-EINVAL);
  
  	list_for_each_entry_rcu(table, &net->nft.tables, list,
  				lockdep_is_held(&net->nft.commit_mutex)) {
  		if (!nla_strcmp(nla, table->name) &&
  		    table->family == family &&
  		    nft_active_genmask(table, genmask))
  			return table;
  	}
  
  	return ERR_PTR(-ENOENT);
  }
  
  static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
  						   const struct nlattr *nla,
  						   u8 genmask)
  {
  	struct nft_table *table;
  
  	list_for_each_entry(table, &net->nft.tables, list) {
  		if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
  		    nft_active_genmask(table, genmask))
  			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
  static int nft_request_module(struct net *net, const char *fmt, ...)
  {
  	char module_name[MODULE_NAME_LEN];
  	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;
  
  	list_for_each_entry(req, &net->nft.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, &net->nft.module_list);
  
  	return -EAGAIN;
  }
  #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 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;
  	struct nfgenmsg *nfmsg;
  
  	event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
  	nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
  	if (nlh == NULL)
  		goto nla_put_failure;
  
  	nfmsg = nlmsg_data(nlh);
  	nfmsg->nfgen_family	= family;
  	nfmsg->version		= NFNETLINK_V0;
  	nfmsg->res_id		= htons(net->nft.base_seq & 0xffff);
  
  	if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
  	    nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
  	    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 (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 sk_buff *skb;
  	int err;
  	char *buf = kasprintf(GFP_KERNEL, "%s:%llu;?:0",
  			      ctx->table->name, ctx->table->handle);
  
  	audit_log_nfcfg(buf,
  			ctx->family,
  			ctx->table->use,
  			event == NFT_MSG_NEWTABLE ?
  				AUDIT_NFT_OP_TABLE_REGISTER :
  				AUDIT_NFT_OP_TABLE_UNREGISTER,
  			GFP_KERNEL);
  	kfree(buf);
  
  	if (!ctx->report &&
  	    !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
  		return;
  
  	skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
  	if (skb == NULL)
  		goto err;
  
  	err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
  					event, 0, ctx->family, ctx->table);
  	if (err < 0) {
  		kfree_skb(skb);
  		goto err;
  	}
  
  	nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.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);
  	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();
  	cb->seq = net->nft.base_seq;
  
  	list_for_each_entry_rcu(table, &net->nft.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 net *net, struct sock *nlsk,
  			      struct sk_buff *skb, const struct nlmsghdr *nlh,
  			      const struct nlattr * const nla[],
  			      struct netlink_ext_ack *extack)
  {
  	const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
  	u8 genmask = nft_genmask_cur(net);
  	const struct nft_table *table;
  	struct sk_buff *skb2;
  	int family = nfmsg->nfgen_family;
  	int err;
  
  	if (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(nlsk, skb, nlh, &c);
  	}
  
  	table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask);
  	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,
  					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)
  {
  	nft_table_disable(net, table, 0);
  }
  
  static int nf_tables_updtable(struct nft_ctx *ctx)
  {
  	struct nft_trans *trans;
  	u32 flags;
  	int ret = 0;
  
  	if (!ctx->nla[NFTA_TABLE_FLAGS])
  		return 0;
  
  	flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
  	if (flags & ~NFT_TABLE_F_DORMANT)
  		return -EINVAL;
  
  	if (flags == ctx->table->flags)
  		return 0;
  
  	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)) {
  		nft_trans_table_enable(trans) = false;
  	} else if (!(flags & NFT_TABLE_F_DORMANT) &&
  		   ctx->table->flags & NFT_TABLE_F_DORMANT) {
  		ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
  		ret = nf_tables_table_enable(ctx->net, ctx->table);
  		if (ret >= 0)
  			nft_trans_table_enable(trans) = true;
  		else
  			ctx->table->flags |= NFT_TABLE_F_DORMANT;
  	}
  	if (ret < 0)
  		goto err;
  
  	nft_trans_table_update(trans) = true;
  	list_add_tail(&trans->list, &ctx->net->nft.commit_list);
  	return 0;
  err:
  	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 net *net, struct sock *nlsk,
  			      struct sk_buff *skb, const struct nlmsghdr *nlh,
  			      const struct nlattr * const nla[],
  			      struct netlink_ext_ack *extack)
  {
  	const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
  	u8 genmask = nft_genmask_next(net);
  	int family = nfmsg->nfgen_family;
  	const struct nlattr *attr;
  	struct nft_table *table;
  	struct nft_ctx ctx;
  	u32 flags = 0;
  	int err;
  
  	lockdep_assert_held(&net->nft.commit_mutex);
  	attr = nla[NFTA_TABLE_NAME];
  	table = nft_table_lookup(net, attr, family, genmask);
  	if (IS_ERR(table)) {
  		if (PTR_ERR(table) != -ENOENT)
  			return PTR_ERR(table);
  	} else {
  		if (nlh->nlmsg_flags & NLM_F_EXCL) {
  			NL_SET_BAD_ATTR(extack, attr);
  			return -EEXIST;
  		}
  		if (nlh->nlmsg_flags & NLM_F_REPLACE)
  			return -EOPNOTSUPP;
  
  		nft_ctx_init(&ctx, net, skb, 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_DORMANT)
  			return -EINVAL;
  	}
  
  	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;
  
  	nft_ctx_init(&ctx, net, skb, 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, &net->nft.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 nft_table *table, *nt;
  	const struct nlattr * const *nla = ctx->nla;
  	int err = 0;
  
  	list_for_each_entry_safe(table, nt, &ctx->net->nft.tables, list) {
  		if (family != AF_UNSPEC && table->family != family)
  			continue;
  
  		ctx->family = table->family;
  
  		if (!nft_is_active_next(ctx->net, table))
  			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 net *net, struct sock *nlsk,
  			      struct sk_buff *skb, const struct nlmsghdr *nlh,
  			      const struct nlattr * const nla[],
  			      struct netlink_ext_ack *extack)
  {
  	const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
  	u8 genmask = nft_genmask_next(net);
  	int family = nfmsg->nfgen_family;
  	const struct nlattr *attr;
  	struct nft_table *table;
  	struct nft_ctx ctx;
  
  	nft_ctx_init(&ctx, net, skb, 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);
  	} else {
  		attr = nla[NFTA_TABLE_NAME];
  		table = nft_table_lookup(net, attr, family, genmask);
  	}
  
  	if (IS_ERR(table)) {
  		NL_SET_BAD_ATTR(extack, attr);
  		return PTR_ERR(table);
  	}
  
  	if (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
  	return lockdep_is_held(&net->nft.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_strlcpy(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;
  	struct nfgenmsg *nfmsg;
  
  	event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
  	nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
  	if (nlh == NULL)
  		goto nla_put_failure;
  
  	nfmsg = nlmsg_data(nlh);
  	nfmsg->nfgen_family	= family;
  	nfmsg->version		= NFNETLINK_V0;
  	nfmsg->res_id		= htons(net->nft.base_seq & 0xffff);
  
  	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 sk_buff *skb;
  	int err;
  	char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
  			      ctx->table->name, ctx->table->handle,
  			      ctx->chain->name, ctx->chain->handle);
  
  	audit_log_nfcfg(buf,
  			ctx->family,
  			ctx->chain->use,
  			event == NFT_MSG_NEWCHAIN ?
  				AUDIT_NFT_OP_CHAIN_REGISTER :
  				AUDIT_NFT_OP_CHAIN_UNREGISTER,
  			GFP_KERNEL);
  	kfree(buf);
  
  	if (!ctx->report &&
  	    !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
  		return;
  
  	skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
  	if (skb == NULL)
  		goto err;
  
  	err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
  					event, 0, ctx->family, ctx->table,
  					ctx->chain);
  	if (err < 0) {
  		kfree_skb(skb);
  		goto err;
  	}
  
  	nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.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);
  	const struct nft_table *table;
  	const struct nft_chain *chain;
  	unsigned int idx = 0, s_idx = cb->args[0];
  	struct net *net = sock_net(skb->sk);
  	int family = nfmsg->nfgen_family;
  
  	rcu_read_lock();
  	cb->seq = net->nft.base_seq;
  
  	list_for_each_entry_rcu(table, &net->nft.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 net *net, struct sock *nlsk,
  			      struct sk_buff *skb, const struct nlmsghdr *nlh,
  			      const struct nlattr * const nla[],
  			      struct netlink_ext_ack *extack)
  {
  	const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
  	u8 genmask = nft_genmask_cur(net);
  	const struct nft_chain *chain;
  	struct nft_table *table;
  	struct sk_buff *skb2;
  	int family = nfmsg->nfgen_family;
  	int err;
  
  	if (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(nlsk, skb, nlh, &c);
  	}
  
  	table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
  	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,
  					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_strlcpy(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,
  				bool autoload)
  {
  	struct nlattr *ha[NFTA_HOOK_MAX + 1];
  	const struct nft_chain_type *type;
  	int err;
  
  	lockdep_assert_held(&net->nft.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))
  			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))
  		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];
  }
  
  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)
  {
  	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, 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,
  					   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 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, &ctx->net->nft.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;
  	}
  	list_add_tail(&trans->list, &ctx->net->nft.commit_list);
  
  	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)
  {
  	u32 id = ntohl(nla_get_be32(nla));
  	struct nft_trans *trans;
  
  	list_for_each_entry(trans, &net->nft.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 net *net, struct sock *nlsk,
  			      struct sk_buff *skb, const struct nlmsghdr *nlh,
  			      const struct nlattr * const nla[],
  			      struct netlink_ext_ack *extack)
  {
  	const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
  	u8 genmask = nft_genmask_next(net);
  	int family = nfmsg->nfgen_family;
  	struct nft_chain *chain = NULL;
  	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(&net->nft.commit_mutex);
  
  	table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
  	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, nlh, family, table, chain, nla);
  
  	if (chain != NULL) {
  		if (nlh->nlmsg_flags & NLM_F_EXCL) {
  			NL_SET_BAD_ATTR(extack, attr);
  			return -EEXIST;
  		}
  		if (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);
  }
  
  static int nf_tables_delchain(struct net *net, struct sock *nlsk,
  			      struct sk_buff *skb, const struct nlmsghdr *nlh,
  			      const struct nlattr * const nla[],
  			      struct netlink_ext_ack *extack)
  {
  	const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
  	u8 genmask = nft_genmask_next(net);
  	int family = nfmsg->nfgen_family;
  	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);
  	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 (nlh->nlmsg_flags & NLM_F_NONREC &&
  	    chain->use > 0)
  		return -EBUSY;
  
  	nft_ctx_init(&ctx, net, skb, 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 *info,
  			     struct nft_expr *expr)
  {
  	const struct nft_expr_ops *ops = info->ops;
  	int err;
  
  	expr->ops = ops;
  	if (ops->init) {
  		err = ops->init(ctx, expr, (const struct nlattr **)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 info;
  	struct nft_expr *expr;
  	struct module *owner;
  	int err;
  
  	err = nf_tables_expr_parse(ctx, nla, &info);
  	if (err < 0)
  		goto err1;
  
  	err = -ENOMEM;
  	expr = kzalloc(info.ops->size, GFP_KERNEL);
  	if (expr == NULL)
  		goto err2;
  
  	err = nf_tables_newexpr(ctx, &info, expr);
  	if (err < 0)
  		goto err3;
  
  	return expr;
  err3:
  	kfree(expr);
  err2:
  	owner = info.ops->type->owner;
  	if (info.ops->type->release_ops)
  		info.ops->type->release_ops(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,
  				    const struct nft_rule *prule)
  {
  	struct nlmsghdr *nlh;
  	struct nfgenmsg *nfmsg;
  	const struct nft_expr *expr, *next;
  	struct nlattr *list;
  	u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
  
  	nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags);
  	if (nlh == NULL)
  		goto nla_put_failure;
  
  	nfmsg = nlmsg_data(nlh);
  	nfmsg->nfgen_family	= family;
  	nfmsg->version		= NFNETLINK_V0;
  	nfmsg->res_id		= htons(net->nft.base_seq & 0xffff);
  
  	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 && prule) {
  		if (nla_put_be64(skb, NFTA_RULE_POSITION,
  				 cpu_to_be64(prule->handle),
  				 NFTA_RULE_PAD))
  			goto nla_put_failure;
  	}
  
  	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 sk_buff *skb;
  	int err;
  	char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
  			      ctx->table->name, ctx->table->handle,
  			      ctx->chain->name, ctx->chain->handle);
  
  	audit_log_nfcfg(buf,
  			ctx->family,
  			rule->handle,
  			event == NFT_MSG_NEWRULE ?
  				AUDIT_NFT_OP_RULE_REGISTER :
  				AUDIT_NFT_OP_RULE_UNREGISTER,
  			GFP_KERNEL);
  	kfree(buf);
  
  	if (!ctx->report &&
  	    !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
  		return;
  
  	skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
  	if (skb == NULL)
  		goto err;
  
  	err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
  				       event, 0, ctx->family, ctx->table,
  				       ctx->chain, rule, NULL);
  	if (err < 0) {
  		kfree_skb(skb);
  		goto err;
  	}
  
  	nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.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];
  
  	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 (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, prule) < 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;
  
  	rcu_read_lock();
  	cb->seq = net->nft.base_seq;
  
  	list_for_each_entry_rcu(table, &net->nft.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 net *net, struct sock *nlsk,
  			     struct sk_buff *skb, const struct nlmsghdr *nlh,
  			     const struct nlattr * const nla[],
  			     struct netlink_ext_ack *extack)
  {
  	const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
  	u8 genmask = nft_genmask_cur(net);
  	const struct nft_chain *chain;
  	const struct nft_rule *rule;
  	struct nft_table *table;
  	struct sk_buff *skb2;
  	int family = nfmsg->nfgen_family;
  	int err;
  
  	if (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(nlsk, skb, nlh, &c);
  	}
  
  	table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
  	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,
  				       nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
  				       family, table, chain, rule, NULL);
  	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 net *net, struct sock *nlsk,
  			     struct sk_buff *skb, const struct nlmsghdr *nlh,
  			     const struct nlattr * const nla[],
  			     struct netlink_ext_ack *extack)
  {
  	const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
  	u8 genmask = nft_genmask_next(net);
  	struct nft_expr_info *info = NULL;
  	int family = nfmsg->nfgen_family;
  	struct nft_flow_rule *flow;
  	struct nft_table *table;
  	struct nft_chain *chain;
  	struct nft_rule *rule, *old_rule = NULL;
  	struct nft_userdata *udata;
  	struct nft_trans *trans = NULL;
  	struct nft_expr *expr;
  	struct nft_ctx ctx;
  	struct nlattr *tmp;
  	unsigned int size, i, n, ulen = 0, usize = 0;
  	int err, rem;
  	u64 handle, pos_handle;
  
  	lockdep_assert_held(&net->nft.commit_mutex);
  
  	table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
  	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 (nlh->nlmsg_flags & NLM_F_EXCL) {
  			NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
  			return -EEXIST;
  		}
  		if (nlh->nlmsg_flags & NLM_F_REPLACE)
  			old_rule = rule;
  		else
  			return -EOPNOTSUPP;
  	} else {
  		if (!(nlh->nlmsg_flags & NLM_F_CREATE) ||
  		    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, nlh, family, table, chain, nla);
  
  	n = 0;
  	size = 0;
  	if (nla[NFTA_RULE_EXPRESSIONS]) {
  		info = kvmalloc_array(NFT_RULE_MAXEXPRS,
  				      sizeof(struct nft_expr_info),
  				      GFP_KERNEL);
  		if (!info)
  			return -ENOMEM;
  
  		nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
  			err = -EINVAL;
  			if (nla_type(tmp) != NFTA_LIST_ELEM)
  				goto err1;
  			if (n == NFT_RULE_MAXEXPRS)
  				goto err1;
  			err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
  			if (err < 0) {
  				NL_SET_BAD_ATTR(extack, tmp);
  				goto err1;
  			}
  			size += info[n].ops->size;
  			n++;
  		}
  	}
  	/* Check for overflow of dlen field */
  	err = -EFBIG;
  	if (size >= 1 << 12)
  		goto err1;
  
  	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 err1;
  
  	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, &info[i], expr);
  		if (err < 0) {
  			NL_SET_BAD_ATTR(extack, info[i].attr);
  			goto err2;
  		}
  
  		if (info[i].ops->validate)
  			nft_validate_state_update(net, NFT_VALIDATE_NEED);
  
  		info[i].ops = NULL;
  		expr = nft_expr_next(expr);
  	}
  
  	if (nlh->nlmsg_flags & NLM_F_REPLACE) {
  		trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
  		if (trans == NULL) {
  			err = -ENOMEM;
  			goto err2;
  		}
  		err = nft_delrule(&ctx, old_rule);
  		if (err < 0) {
  			nft_trans_destroy(trans);
  			goto err2;
  		}
  
  		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 err2;
  		}
  
  		if (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(info);
  	chain->use++;
  
  	if (net->nft.validate_state == NFT_VALIDATE_DO)
  		return nft_table_validate(net, table);
  
  	if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
  		flow = nft_flow_rule_create(net, rule);
  		if (IS_ERR(flow))
  			return PTR_ERR(flow);
  
  		nft_trans_flow_rule(trans) = flow;
  	}
  
  	return 0;
  err2:
  	nf_tables_rule_release(&ctx, rule);
  err1:
  	for (i = 0; i < n; i++) {
  		if (info[i].ops) {
  			module_put(info[i].ops->type->owner);
  			if (info[i].ops->type->release_ops)
  				info[i].ops->type->release_ops(info[i].ops);
  		}
  	}
  	kvfree(info);
  	return err;
  }
  
  static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
  					     const struct nlattr *nla)
  {
  	u32 id = ntohl(nla_get_be32(nla));
  	struct nft_trans *trans;
  
  	list_for_each_entry(trans, &net->nft.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 net *net, struct sock *nlsk,
  			     struct sk_buff *skb, const struct nlmsghdr *nlh,
  			     const struct nlattr * const nla[],
  			     struct netlink_ext_ack *extack)
  {
  	const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
  	u8 genmask = nft_genmask_next(net);
  	struct nft_table *table;
  	struct nft_chain *chain = NULL;
  	struct nft_rule *rule;
  	int family = nfmsg->nfgen_family, err = 0;
  	struct nft_ctx ctx;
  
  	table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
  	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, 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)
  {
  	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(&ctx->net->nft.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 },
  };
  
  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 int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
  				     const struct sk_buff *skb,
  				     const struct nlmsghdr *nlh,
  				     const struct nlattr * const nla[],
  				     struct netlink_ext_ack *extack,
  				     u8 genmask)
  {
  	const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
  	int family = nfmsg->nfgen_family;
  	struct nft_table *table = NULL;
  
  	if (nla[NFTA_SET_TABLE] != NULL) {
  		table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
  					 genmask);
  		if (IS_ERR(table)) {
  			NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
  			return PTR_ERR(table);
  		}
  	}
  
  	nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
  	return 0;
  }
  
  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 nft_trans *trans;
  	u32 id = ntohl(nla_get_be32(nla));
  
  	list_for_each_entry(trans, &net->nft.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 nfgenmsg *nfmsg;
  	struct nlmsghdr *nlh;
  	u32 portid = ctx->portid;
  	struct nlattr *nest;
  	u32 seq = ctx->seq;
  
  	event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
  	nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
  			flags);
  	if (nlh == NULL)
  		goto nla_put_failure;
  
  	nfmsg = nlmsg_data(nlh);
  	nfmsg->nfgen_family	= ctx->family;
  	nfmsg->version		= NFNETLINK_V0;
  	nfmsg->res_id		= htons(ctx->net->nft.base_seq & 0xffff);
  
  	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->expr) {
  		nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
  		if (nf_tables_fill_expr_info(skb, set->expr) < 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 sk_buff *skb;
  	u32 portid = ctx->portid;
  	int err;
  	char *buf = kasprintf(gfp_flags, "%s:%llu;%s:%llu",
  			      ctx->table->name, ctx->table->handle,
  			      set->name, set->handle);
  
  	audit_log_nfcfg(buf,
  			ctx->family,
  			set->field_count,
  			event == NFT_MSG_NEWSET ?
  				AUDIT_NFT_OP_SET_REGISTER :
  				AUDIT_NFT_OP_SET_UNREGISTER,
  			gfp_flags);
  	kfree(buf);
  
  	if (!ctx->report &&
  	    !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
  		return;
  
  	skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
  	if (skb == NULL)
  		goto err;
  
  	err = nf_tables_fill_set(skb, ctx, set, event, 0);
  	if (err < 0) {
  		kfree_skb(skb);
  		goto err;
  	}
  
  	nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.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;
  
  	if (cb->args[1])
  		return skb->len;
  
  	rcu_read_lock();
  	cb->seq = net->nft.base_seq;
  
  	list_for_each_entry_rcu(table, &net->nft.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 net *net, struct sock *nlsk,
  			    struct sk_buff *skb, const struct nlmsghdr *nlh,
  			    const struct nlattr * const nla[],
  			    struct netlink_ext_ack *extack)
  {
  	u8 genmask = nft_genmask_cur(net);
  	const struct nft_set *set;
  	struct nft_ctx ctx;
  	struct sk_buff *skb2;
  	const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
  	int err;
  
  	/* Verify existence before starting dump */
  	err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
  					genmask);
  	if (err < 0)
  		return err;
  
  	if (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(nlsk, skb, nlh, &c);
  	}
  
  	/* Only accept unspec with dump */
  	if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
  		return -EAFNOSUPPORT;
  	if (!nla[NFTA_SET_TABLE])
  		return -EINVAL;
  
  	set = nft_set_lookup(ctx.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 net *net, struct sock *nlsk,
  			    struct sk_buff *skb, const struct nlmsghdr *nlh,
  			    const struct nlattr * const nla[],
  			    struct netlink_ext_ack *extack)
  {
  	const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
  	u8 genmask = nft_genmask_next(net);
  	int family = nfmsg->nfgen_family;
  	const struct nft_set_ops *ops;
  	struct nft_expr *expr = NULL;
  	struct nft_table *table;
  	struct nft_set *set;
  	struct nft_ctx ctx;
  	size_t alloc_size;
  	char *name;
  	u64 size;
  	u64 timeout;
  	u32 ktype, dtype, flags, policy, gc_int, objtype;
  	struct nft_set_desc desc;
  	unsigned char *udata;
  	u16 udlen;
  	int err;
  	int i;
  
  	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))
  			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])
  		desc.expr = true;
  
  	table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask);
  	if (IS_ERR(table)) {
  		NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
  		return PTR_ERR(table);
  	}
  
  	nft_ctx_init(&ctx, net, skb, 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 (nlh->nlmsg_flags & NLM_F_EXCL) {
  			NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
  			return -EEXIST;
  		}
  		if (nlh->nlmsg_flags & NLM_F_REPLACE)
  			return -EOPNOTSUPP;
  
  		return 0;
  	}
  
  	if (!(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);
  	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->expr = expr;
  	}
  
  	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:
  	if (set->expr)
  		nft_expr_destroy(&ctx, set->expr);
  
  	ops->destroy(set);
  err_set_init:
  	kfree(set->name);
  err_set_name:
  	kvfree(set);
  	return err;
  }
  
  static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
  {
  	if (WARN_ON(set->use > 0))
  		return;
  
  	if (set->expr)
  		nft_expr_destroy(ctx, set->expr);
  
  	set->ops->destroy(set);
  	kfree(set->name);
  	kvfree(set);
  }
  
  static int nf_tables_delset(struct net *net, struct sock *nlsk,
  			    struct sk_buff *skb, const struct nlmsghdr *nlh,
  			    const struct nlattr * const nla[],
  			    struct netlink_ext_ack *extack)
  {
  	const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
  	u8 genmask = nft_genmask_next(net);
  	const struct nlattr *attr;
  	struct nft_set *set;
  	struct nft_ctx ctx;
  	int err;
  
  	if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
  		return -EAFNOSUPPORT;
  	if (nla[NFTA_SET_TABLE] == NULL)
  		return -EINVAL;
  
  	err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
  					genmask);
  	if (err < 0)
  		return err;
  
  	if (nla[NFTA_SET_HANDLE]) {
  		attr = nla[NFTA_SET_HANDLE];
  		set = nft_set_lookup_byhandle(ctx.table, attr, genmask);
  	} else {
  		attr = nla[NFTA_SET_NAME];
  		set = nft_set_lookup(ctx.table, attr, genmask);
  	}
  
  	if (IS_ERR(set)) {
  		NL_SET_BAD_ATTR(extack, attr);
  		return PTR_ERR(set);
  	}
  	if (set->use ||
  	    (nlh->nlmsg_flags & NLM_F_NONREC && atomic_read(&set->nelems) > 0)) {
  		NL_SET_BAD_ATTR(extack, attr);
  		return -EBUSY;
  	}
  
  	return nft_delset(&ctx, set);
  }
  
  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)
  {
  	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);
  }
  
  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 < 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_EXPR]		= {
  		.align	= __alignof__(struct nft_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 },
  };
  
  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_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
  				      const struct sk_buff *skb,
  				      const struct nlmsghdr *nlh,
  				      const struct nlattr * const nla[],
  				      struct netlink_ext_ack *extack,
  				      u8 genmask)
  {
  	const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
  	int family = nfmsg->nfgen_family;
  	struct nft_table *table;
  
  	table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
  				 genmask);
  	if (IS_ERR(table)) {
  		NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
  		return PTR_ERR(table);
  	}
  
  	nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
  	return 0;
  }
  
  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_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_EXPR) &&
  	    nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
  		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 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 nft_table *table;
  	struct nft_set *set;
  	struct nft_set_dump_args args;
  	bool set_found = false;
  	struct nfgenmsg *nfmsg;
  	struct nlmsghdr *nlh;
  	struct nlattr *nest;
  	u32 portid, seq;
  	int event;
  
  	rcu_read_lock();
  	list_for_each_entry_rcu(table, &net->nft.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 = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
  			NLM_F_MULTI);
  	if (nlh == NULL)
  		goto nla_put_failure;
  
  	nfmsg = nlmsg_data(nlh);
  	nfmsg->nfgen_family = table->family;
  	nfmsg->version      = NFNETLINK_V0;
  	nfmsg->res_id	    = htons(net->nft.base_seq & 0xffff);
  
  	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);
  	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 nfgenmsg *nfmsg;
  	struct nlmsghdr *nlh;
  	struct nlattr *nest;
  	int err;
  
  	event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
  	nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
  			flags);
  	if (nlh == NULL)
  		goto nla_put_failure;
  
  	nfmsg = nlmsg_data(nlh);
  	nfmsg->nfgen_family	= ctx->family;
  	nfmsg->version		= NFNETLINK_V0;
  	nfmsg->res_id		= htons(ctx->net->nft.base_seq & 0xffff);
  
  	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)
  		return -EINVAL;
  	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 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;
  	void *priv;
  	int err;
  
  	err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
  					  nft_set_elem_policy, NULL);
  	if (err < 0)
  		return err;
  
  	if (!nla[NFTA_SET_ELEM_KEY])
  		return -EINVAL;
  
  	err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
  	if (err < 0)
  		return err;
  
  	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;
  	}
  
  	priv = set->ops->get(ctx->net, set, &elem, flags);
  	if (IS_ERR(priv))
  		return PTR_ERR(priv);
  
  	elem.priv = priv;
  
  	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 net *net, struct sock *nlsk,
  				struct sk_buff *skb, const struct nlmsghdr *nlh,
  				const struct nlattr * const nla[],
  				struct netlink_ext_ack *extack)
  {
  	u8 genmask = nft_genmask_cur(net);
  	struct nft_set *set;
  	struct nlattr *attr;
  	struct nft_ctx ctx;
  	int rem, err = 0;
  
  	err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
  					 genmask);
  	if (err < 0)
  		return err;
  
  	set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
  	if (IS_ERR(set))
  		return PTR_ERR(set);
  
  	if (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(nlsk, skb, 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, u16 flags)
  {
  	struct net *net = ctx->net;
  	u32 portid = ctx->portid;
  	struct sk_buff *skb;
  	int err;
  	char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
  			      ctx->table->name, ctx->table->handle,
  			      set->name, set->handle);
  
  	audit_log_nfcfg(buf,
  			ctx->family,
  			set->handle,
  			event == NFT_MSG_NEWSETELEM ?
  				AUDIT_NFT_OP_SETELEM_REGISTER :
  				AUDIT_NFT_OP_SETELEM_UNREGISTER,
  			GFP_KERNEL);
  	kfree(buf);
  
  	if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
  		return;
  
  	skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
  	if (skb == NULL)
  		goto err;
  
  	err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
  					  set, elem);
  	if (err < 0) {
  		kfree_skb(skb);
  		goto err;
  	}
  
  	nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.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);
  
  	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);
  	}
  }
  
  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_EXPR))
  		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_set_elem_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_EXPR))
  		nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
  
  	kfree(elem);
  }
  
  static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
  				   const struct nft_set_ext *ext,
  				   struct nft_expr *expr)
  {
  	struct nft_expr *elem_expr = nft_set_ext_expr(ext);
  	int err;
  
  	if (expr == NULL)
  		return 0;
  
  	err = nft_expr_clone(elem_expr, expr);
  	if (err < 0)
  		return -ENOMEM;
  
  	nft_expr_destroy(ctx, expr);
  	return 0;
  }
  
  static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
  			    const struct nlattr *attr, u32 nlmsg_flags)
  {
  	struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
  	u8 genmask = nft_genmask_next(ctx->net);
  	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_expr *expr = NULL;
  	struct nft_userdata *udata;
  	struct nft_data_desc desc;
  	enum nft_registers dreg;
  	struct nft_trans *trans;
  	u32 flags = 0;
  	u64 timeout;
  	u64 expiration;
  	u8 ulen;
  	int err;
  
  	err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
  					  nft_set_elem_policy, NULL);
  	if (err < 0)
  		return err;
  
  	if (nla[NFTA_SET_ELEM_KEY] == NULL)
  		return -EINVAL;
  
  	nft_set_ext_prepare(&tmpl);
  
  	err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
  	if (err < 0)
  		return err;
  	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]))
  		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] != NULL) {
  		expr = nft_set_elem_expr_alloc(ctx, set,
  					       nla[NFTA_SET_ELEM_EXPR]);
  		if (IS_ERR(expr))
  			return PTR_ERR(expr);
  
  		err = -EOPNOTSUPP;
  		if (set->expr && set->expr->ops != expr->ops)
  			goto err_set_elem_expr;
  	} else if (set->expr) {
  		expr = kzalloc(set->expr->ops->size, GFP_KERNEL);
  		if (!expr)
  			return -ENOMEM;
  
  		err = nft_expr_clone(expr, set->expr);
  		if (err < 0)
  			goto err_set_elem_expr;
  	}
  
  	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 (expr)
  		nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPR,
  				       expr->ops->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);
  	if (err < 0)
  		goto err_elem_expr;
  	expr = NULL;
  
  	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 = set->ops->insert(ctx->net, set, &elem, &ext2);
  	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 (set->size &&
  	    !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
  		err = -ENFILE;
  		goto err_set_full;
  	}
  
  	nft_trans_elem(trans) = elem;
  	list_add_tail(&trans->list, &ctx->net->nft.commit_list);
  	return 0;
  
  err_set_full:
  	set->ops->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.val, NFT_DATA_VALUE);
  err_set_elem_expr:
  	if (expr != NULL)
  		nft_expr_destroy(ctx, expr);
  
  	return err;
  }
  
  static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
  				struct sk_buff *skb, const struct nlmsghdr *nlh,
  				const struct nlattr * const nla[],
  				struct netlink_ext_ack *extack)
  {
  	u8 genmask = nft_genmask_next(net);
  	const struct nlattr *attr;
  	struct nft_set *set;
  	struct nft_ctx ctx;
  	int rem, err;
  
  	if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
  		return -EINVAL;
  
  	err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
  					 genmask);
  	if (err < 0)
  		return err;
  
  	set = nft_set_lookup_global(net, ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
  				    nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
  	if (IS_ERR(set))
  		return PTR_ERR(set);
  
  	if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
  		return -EBUSY;
  
  	nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
  		err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
  		if (err < 0)
  			return err;
  	}
  
  	if (net->nft.validate_state == NFT_VALIDATE_DO)
  		return nft_table_validate(net, ctx.table);
  
  	return 0;
  }
  
  /**
   *	nft_data_hold - hold a nft_data item
   *
   *	@data: struct nft_data to release
   *	@type: type of data
   *
   *	Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
   *	NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
   *	NFT_GOTO verdicts. This function must be called on active data objects
   *	from the second phase of the commit protocol.
   */
  void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
  {
  	struct nft_chain *chain;
  	struct nft_rule *rule;
  
  	if (type == NFT_DATA_VERDICT) {
  		switch (data->verdict.code) {
  		case NFT_JUMP:
  		case NFT_GOTO:
  			chain = data->verdict.chain;
  			chain->use++;
  
  			if (!nft_chain_is_bound(chain))
  				break;
  
  			chain->table->use++;
  			list_for_each_entry(rule, &chain->rules, list)
  				chain->use++;
  
  			nft_chain_add(chain->table, chain);
  			break;
  		}
  	}
  }
  
  static void nft_set_elem_activate(const struct net *net,
  				  const struct nft_set *set,
  				  struct nft_set_elem *elem)
  {
  	const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
  
  	if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
  		nft_data_hold(nft_set_ext_data(ext), set->dtype);
  	if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
  		(*nft_set_ext_obj(ext))->use++;
  }
  
  static void nft_set_elem_deactivate(const struct net *net,
  				    const struct nft_set *set,
  				    struct nft_set_elem *elem)
  {
  	const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
  
  	if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
  		nft_data_release(nft_set_ext_data(ext), set->dtype);
  	if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
  		(*nft_set_ext_obj(ext))->use--;
  }
  
  static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
  			   const struct nlattr *attr)
  {
  	struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
  	struct nft_set_ext_tmpl tmpl;
  	struct nft_set_elem elem;
  	struct nft_set_ext *ext;
  	struct nft_trans *trans;
  	u32 flags = 0;
  	void *priv;
  	int err;
  
  	err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
  					  nft_set_elem_policy, NULL);
  	if (err < 0)
  		return err;
  
  	if (nla[NFTA_SET_ELEM_KEY] == NULL)
  		return -EINVAL;
  
  	nft_set_ext_prepare(&tmpl);
  
  	err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
  	if (err < 0)
  		return err;
  	if (flags != 0)
  		nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
  
  	err = nft_setelem_parse_key(ctx, set, &elem.key.val,
  				    nla[NFTA_SET_ELEM_KEY]);
  	if (err < 0)
  		return err;
  
  	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)
  			return err;
  
  		nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
  	}
  
  	err = -ENOMEM;
  	elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
  				      elem.key_end.val.data, NULL, 0, 0,
  				      GFP_KERNEL);
  	if (elem.priv == NULL)
  		goto fail_elem;
  
  	ext = nft_set_elem_ext(set, elem.priv);
  	if (flags)
  		*nft_set_ext_flags(ext) = flags;
  
  	trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
  	if (trans == NULL)
  		goto fail_trans;
  
  	priv = set->ops->deactivate(ctx->net, set, &elem);
  	if (priv == NULL) {
  		err = -ENOENT;
  		goto fail_ops;
  	}
  	kfree(elem.priv);
  	elem.priv = priv;
  
  	nft_set_elem_deactivate(ctx->net, set, &elem);
  
  	nft_trans_elem(trans) = elem;
  	list_add_tail(&trans->list, &ctx->net->nft.commit_list);
  	return 0;
  
  fail_ops:
  	kfree(trans);
  fail_trans:
  	kfree(elem.priv);
  fail_elem:
  	nft_data_release(&elem.key.val, NFT_DATA_VALUE);
  	return err;
  }
  
  static int nft_flush_set(const struct nft_ctx *ctx,
  			 struct nft_set *set,
  			 const struct nft_set_iter *iter,
  			 struct nft_set_elem *elem)
  {
  	struct nft_trans *trans;
  	int err;
  
  	trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
  				    sizeof(struct nft_trans_elem), GFP_ATOMIC);
  	if (!trans)
  		return -ENOMEM;
  
  	if (!set->ops->flush(ctx->net, set, elem->priv)) {
  		err = -ENOENT;
  		goto err1;
  	}
  	set->ndeact++;
  
  	nft_set_elem_deactivate(ctx->net, set, elem);
  	nft_trans_elem_set(trans) = set;
  	nft_trans_elem(trans) = *elem;
  	list_add_tail(&trans->list, &ctx->net->nft.commit_list);
  
  	return 0;
  err1:
  	kfree(trans);
  	return err;
  }
  
  static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
  				struct sk_buff *skb, const struct nlmsghdr *nlh,
  				const struct nlattr * const nla[],
  				struct netlink_ext_ack *extack)
  {
  	u8 genmask = nft_genmask_next(net);
  	const struct nlattr *attr;
  	struct nft_set *set;
  	struct nft_ctx ctx;
  	int rem, err = 0;
  
  	err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
  					 genmask);
  	if (err < 0)
  		return err;
  
  	set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
  	if (IS_ERR(set))
  		return PTR_ERR(set);
  	if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
  		return -EBUSY;
  
  	if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
  		struct nft_set_iter iter = {
  			.genmask	= genmask,
  			.fn		= nft_flush_set,
  		};
  		set->ops->walk(&ctx, set, &iter);
  
  		return iter.err;
  	}
  
  	nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
  		err = nft_del_setelem(&ctx, set, attr);
  		if (err < 0)
  			break;
  
  		set->ndeact++;
  	}
  	return err;
  }
  
  void nft_set_gc_batch_release(struct rcu_head *rcu)
  {
  	struct nft_set_gc_batch *gcb;
  	unsigned int i;
  
  	gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
  	for (i = 0; i < gcb->head.cnt; i++)
  		nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
  	kfree(gcb);
  }
  
  struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
  						gfp_t gfp)
  {
  	struct nft_set_gc_batch *gcb;
  
  	gcb = kzalloc(sizeof(*gcb), gfp);
  	if (gcb == NULL)
  		return gcb;
  	gcb->head.set = set;
  	return gcb;
  }
  
  /*
   * Stateful objects
   */
  
  /**
   *	nft_register_obj- register nf_tables stateful object type
   *	@obj_type: object type
   *
   *	Registers the object type for use with nf_tables. Returns zero on
   *	success or a negative errno code otherwise.
   */
  int nft_register_obj(struct nft_object_type *obj_type)
  {
  	if (obj_type->type == NFT_OBJECT_UNSPEC)
  		return -EINVAL;
  
  	nfnl_lock(NFNL_SUBSYS_NFTABLES);
  	list_add_rcu(&obj_type->list, &nf_tables_objects);
  	nfnl_unlock(NFNL_SUBSYS_NFTABLES);
  	return 0;
  }
  EXPORT_SYMBOL_GPL(nft_register_obj);
  
  /**
   *	nft_unregister_obj - unregister nf_tables object type
   *	@obj_type: object type
   *
   * 	Unregisters the object type for use with nf_tables.
   */
  void nft_unregister_obj(struct nft_object_type *obj_type)
  {
  	nfnl_lock(NFNL_SUBSYS_NFTABLES);
  	list_del_rcu(&obj_type->list);
  	nfnl_unlock(NFNL_SUBSYS_NFTABLES);
  }
  EXPORT_SYMBOL_GPL(nft_unregister_obj);
  
  struct nft_object *nft_obj_lookup(const struct net *net,
  				  const struct nft_table *table,
  				  const struct nlattr *nla, u32 objtype,
  				  u8 genmask)
  {
  	struct nft_object_hash_key k = { .table = table };
  	char search[NFT_OBJ_MAXNAMELEN];
  	struct rhlist_head *tmp, *list;
  	struct nft_object *obj;
  
  	nla_strlcpy(search, nla, sizeof(search));
  	k.name = search;
  
  	WARN_ON_ONCE(!rcu_read_lock_held() &&
  		     !lockdep_commit_lock_is_held(net));
  
  	rcu_read_lock();
  	list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
  	if (!list)
  		goto out;
  
  	rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
  		if (objtype == obj->ops->type->type &&
  		    nft_active_genmask(obj, genmask)) {
  			rcu_read_unlock();
  			return obj;
  		}
  	}
  out:
  	rcu_read_unlock();
  	return ERR_PTR(-ENOENT);
  }
  EXPORT_SYMBOL_GPL(nft_obj_lookup);
  
  static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
  						  const struct nlattr *nla,
  						  u32 objtype, u8 genmask)
  {
  	struct nft_object *obj;
  
  	list_for_each_entry(obj, &table->objects, list) {
  		if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
  		    objtype == obj->ops->type->type &&
  		    nft_active_genmask(obj, genmask))
  			return obj;
  	}
  	return ERR_PTR(-ENOENT);
  }
  
  static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
  	[NFTA_OBJ_TABLE]	= { .type = NLA_STRING,
  				    .len = NFT_TABLE_MAXNAMELEN - 1 },
  	[NFTA_OBJ_NAME]		= { .type = NLA_STRING,
  				    .len = NFT_OBJ_MAXNAMELEN - 1 },
  	[NFTA_OBJ_TYPE]		= { .type = NLA_U32 },
  	[NFTA_OBJ_DATA]		= { .type = NLA_NESTED },
  	[NFTA_OBJ_HANDLE]	= { .type = NLA_U64},
  	[NFTA_OBJ_USERDATA]	= { .type = NLA_BINARY,
  				    .len = NFT_USERDATA_MAXLEN },
  };
  
  static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
  				       const struct nft_object_type *type,
  				       const struct nlattr *attr)
  {
  	struct nlattr **tb;
  	const struct nft_object_ops *ops;
  	struct nft_object *obj;
  	int err = -ENOMEM;
  
  	tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
  	if (!tb)
  		goto err1;
  
  	if (attr) {
  		err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
  						  type->policy, NULL);
  		if (err < 0)
  			goto err2;
  	} else {
  		memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
  	}
  
  	if (type->select_ops) {
  		ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
  		if (IS_ERR(ops)) {
  			err = PTR_ERR(ops);
  			goto err2;
  		}
  	} else {
  		ops = type->ops;
  	}
  
  	err = -ENOMEM;
  	obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL);
  	if (!obj)
  		goto err2;
  
  	err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
  	if (err < 0)
  		goto err3;
  
  	obj->ops = ops;
  
  	kfree(tb);
  	return obj;
  err3:
  	kfree(obj);
  err2:
  	kfree(tb);
  err1:
  	return ERR_PTR(err);
  }
  
  static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
  			   struct nft_object *obj, bool reset)
  {
  	struct nlattr *nest;
  
  	nest = nla_nest_start_noflag(skb, attr);
  	if (!nest)
  		goto nla_put_failure;
  	if (obj->ops->dump(skb, obj, reset) < 0)
  		goto nla_put_failure;
  	nla_nest_end(skb, nest);
  	return 0;
  
  nla_put_failure:
  	return -1;
  }
  
  static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
  {
  	const struct nft_object_type *type;
  
  	list_for_each_entry(type, &nf_tables_objects, list) {
  		if (objtype == type->type)
  			return type;
  	}
  	return NULL;
  }
  
  static const struct nft_object_type *
  nft_obj_type_get(struct net *net, u32 objtype)
  {
  	const struct nft_object_type *type;
  
  	type = __nft_obj_type_get(objtype);
  	if (type != NULL && try_module_get(type->owner))
  		return type;
  
  	lockdep_nfnl_nft_mutex_not_held();
  #ifdef CONFIG_MODULES
  	if (type == NULL) {
  		if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
  			return ERR_PTR(-EAGAIN);
  	}
  #endif
  	return ERR_PTR(-ENOENT);
  }
  
  static int nf_tables_updobj(const struct nft_ctx *ctx,
  			    const struct nft_object_type *type,
  			    const struct nlattr *attr,
  			    struct nft_object *obj)
  {
  	struct nft_object *newobj;
  	struct nft_trans *trans;
  	int err;
  
  	trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
  				sizeof(struct nft_trans_obj));
  	if (!trans)
  		return -ENOMEM;
  
  	newobj = nft_obj_init(ctx, type, attr);
  	if (IS_ERR(newobj)) {
  		err = PTR_ERR(newobj);
  		goto err_free_trans;
  	}
  
  	nft_trans_obj(trans) = obj;
  	nft_trans_obj_update(trans) = true;
  	nft_trans_obj_newobj(trans) = newobj;
  	list_add_tail(&trans->list, &ctx->net->nft.commit_list);
  
  	return 0;
  
  err_free_trans:
  	kfree(trans);
  	return err;
  }
  
  static int nf_tables_newobj(struct net *net, struct sock *nlsk,
  			    struct sk_buff *skb, const struct nlmsghdr *nlh,
  			    const struct nlattr * const nla[],
  			    struct netlink_ext_ack *extack)
  {
  	const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
  	const struct nft_object_type *type;
  	u8 genmask = nft_genmask_next(net);
  	int family = nfmsg->nfgen_family;
  	struct nft_table *table;
  	struct nft_object *obj;
  	struct nft_ctx ctx;
  	u32 objtype;
  	int err;
  
  	if (!nla[NFTA_OBJ_TYPE] ||
  	    !nla[NFTA_OBJ_NAME] ||
  	    !nla[NFTA_OBJ_DATA])
  		return -EINVAL;
  
  	table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
  	if (IS_ERR(table)) {
  		NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
  		return PTR_ERR(table);
  	}
  
  	objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
  	obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
  	if (IS_ERR(obj)) {
  		err = PTR_ERR(obj);
  		if (err != -ENOENT) {
  			NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
  			return err;
  		}
  	} else {
  		if (nlh->nlmsg_flags & NLM_F_EXCL) {
  			NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
  			return -EEXIST;
  		}
  		if (nlh->nlmsg_flags & NLM_F_REPLACE)
  			return -EOPNOTSUPP;
  
  		type = __nft_obj_type_get(objtype);
  		nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
  
  		return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
  	}
  
  	nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
  
  	type = nft_obj_type_get(net, objtype);
  	if (IS_ERR(type))
  		return PTR_ERR(type);
  
  	obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
  	if (IS_ERR(obj)) {
  		err = PTR_ERR(obj);
  		goto err_init;
  	}
  	obj->key.table = table;
  	obj->handle = nf_tables_alloc_handle(table);
  
  	obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL);
  	if (!obj->key.name) {
  		err = -ENOMEM;
  		goto err_strdup;
  	}
  
  	if (nla[NFTA_OBJ_USERDATA]) {
  		obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL);
  		if (obj->udata == NULL)
  			goto err_userdata;
  
  		obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
  	}
  
  	err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
  	if (err < 0)
  		goto err_trans;
  
  	err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
  			      nft_objname_ht_params);
  	if (err < 0)
  		goto err_obj_ht;
  
  	list_add_tail_rcu(&obj->list, &table->objects);
  	table->use++;
  	return 0;
  err_obj_ht:
  	/* queued in transaction log */
  	INIT_LIST_HEAD(&obj->list);
  	return err;
  err_trans:
  	kfree(obj->udata);
  err_userdata:
  	kfree(obj->key.name);
  err_strdup:
  	if (obj->ops->destroy)
  		obj->ops->destroy(&ctx, obj);
  	kfree(obj);
  err_init:
  	module_put(type->owner);
  	return err;
  }
  
  static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
  				   u32 portid, u32 seq, int event, u32 flags,
  				   int family, const struct nft_table *table,
  				   struct nft_object *obj, bool reset)
  {
  	struct nfgenmsg *nfmsg;
  	struct nlmsghdr *nlh;
  
  	event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
  	nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
  	if (nlh == NULL)
  		goto nla_put_failure;
  
  	nfmsg = nlmsg_data(nlh);
  	nfmsg->nfgen_family	= family;
  	nfmsg->version		= NFNETLINK_V0;
  	nfmsg->res_id		= htons(net->nft.base_seq & 0xffff);
  
  	if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
  	    nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
  	    nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
  	    nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
  	    nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
  	    nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
  			 NFTA_OBJ_PAD))
  		goto nla_put_failure;
  
  	if (obj->udata &&
  	    nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
  		goto nla_put_failure;
  
  	nlmsg_end(skb, nlh);
  	return 0;
  
  nla_put_failure:
  	nlmsg_trim(skb, nlh);
  	return -1;
  }
  
  struct nft_obj_filter {
  	char		*table;
  	u32		type;
  };
  
  static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
  {
  	const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
  	const struct nft_table *table;
  	unsigned int idx = 0, s_idx = cb->args[0];
  	struct nft_obj_filter *filter = cb->data;
  	struct net *net = sock_net(skb->sk);
  	int family = nfmsg->nfgen_family;
  	struct nft_object *obj;
  	bool reset = false;
  
  	if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
  		reset = true;
  
  	rcu_read_lock();
  	cb->seq = net->nft.base_seq;
  
  	list_for_each_entry_rcu(table, &net->nft.tables, list) {
  		if (family != NFPROTO_UNSPEC && family != table->family)
  			continue;
  
  		list_for_each_entry_rcu(obj, &table->objects, list) {
  			if (!nft_is_active(net, obj))
  				goto cont;
  			if (idx < s_idx)
  				goto cont;
  			if (idx > s_idx)
  				memset(&cb->args[1], 0,
  				       sizeof(cb->args) - sizeof(cb->args[0]));
  			if (filter && filter->table &&
  			    strcmp(filter->table, table->name))
  				goto cont;
  			if (filter &&
  			    filter->type != NFT_OBJECT_UNSPEC &&
  			    obj->ops->type->type != filter->type)
  				goto cont;
  
  			if (reset) {
  				char *buf = kasprintf(GFP_ATOMIC,
  						      "%s:%llu;?:0",
  						      table->name,
  						      table->handle);
  
  				audit_log_nfcfg(buf,
  						family,
  						obj->handle,
  						AUDIT_NFT_OP_OBJ_RESET,
  						GFP_ATOMIC);
  				kfree(buf);
  			}
  
  			if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
  						    cb->nlh->nlmsg_seq,
  						    NFT_MSG_NEWOBJ,
  						    NLM_F_MULTI | NLM_F_APPEND,
  						    table->family, table,
  						    obj, reset) < 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 nf_tables_dump_obj_start(struct netlink_callback *cb)
  {
  	const struct nlattr * const *nla = cb->data;
  	struct nft_obj_filter *filter = NULL;
  
  	if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
  		filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
  		if (!filter)
  			return -ENOMEM;
  
  		if (nla[NFTA_OBJ_TABLE]) {
  			filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
  			if (!filter->table) {
  				kfree(filter);
  				return -ENOMEM;
  			}
  		}
  
  		if (nla[NFTA_OBJ_TYPE])
  			filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
  	}
  
  	cb->data = filter;
  	return 0;
  }
  
  static int nf_tables_dump_obj_done(struct netlink_callback *cb)
  {
  	struct nft_obj_filter *filter = cb->data;
  
  	if (filter) {
  		kfree(filter->table);
  		kfree(filter);
  	}
  
  	return 0;
  }
  
  /* called with rcu_read_lock held */
  static int nf_tables_getobj(struct net *net, struct sock *nlsk,
  			    struct sk_buff *skb, const struct nlmsghdr *nlh,
  			    const struct nlattr * const nla[],
  			    struct netlink_ext_ack *extack)
  {
  	const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
  	u8 genmask = nft_genmask_cur(net);
  	int family = nfmsg->nfgen_family;
  	const struct nft_table *table;
  	struct nft_object *obj;
  	struct sk_buff *skb2;
  	bool reset = false;
  	u32 objtype;
  	int err;
  
  	if (nlh->nlmsg_flags & NLM_F_DUMP) {
  		struct netlink_dump_control c = {
  			.start = nf_tables_dump_obj_start,
  			.dump = nf_tables_dump_obj,
  			.done = nf_tables_dump_obj_done,
  			.module = THIS_MODULE,
  			.data = (void *)nla,
  		};
  
  		return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
  	}
  
  	if (!nla[NFTA_OBJ_NAME] ||
  	    !nla[NFTA_OBJ_TYPE])
  		return -EINVAL;
  
  	table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
  	if (IS_ERR(table)) {
  		NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
  		return PTR_ERR(table);
  	}
  
  	objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
  	obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
  	if (IS_ERR(obj)) {
  		NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
  		return PTR_ERR(obj);
  	}
  
  	skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
  	if (!skb2)
  		return -ENOMEM;
  
  	if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
  		reset = true;
  
  	if (reset) {
  		char *buf = kasprintf(GFP_ATOMIC, "%s:%llu;?:0",
  				      table->name, table->handle);
  
  		audit_log_nfcfg(buf,
  				family,
  				obj->handle,
  				AUDIT_NFT_OP_OBJ_RESET,
  				GFP_ATOMIC);
  		kfree(buf);
  	}
  
  	err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
  				      nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
  				      family, table, obj, reset);
  	if (err < 0)
  		goto err_fill_obj_info;
  
  	return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
  
  err_fill_obj_info:
  	kfree_skb(skb2);
  	return err;
  }
  
  static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
  {
  	if (obj->ops->destroy)
  		obj->ops->destroy(ctx, obj);
  
  	module_put(obj->ops->type->owner);
  	kfree(obj->key.name);
  	kfree(obj->udata);
  	kfree(obj);
  }
  
  static int nf_tables_delobj(struct net *net, struct sock *nlsk,
  			    struct sk_buff *skb, const struct nlmsghdr *nlh,
  			    const struct nlattr * const nla[],
  			    struct netlink_ext_ack *extack)
  {
  	const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
  	u8 genmask = nft_genmask_next(net);
  	int family = nfmsg->nfgen_family;
  	const struct nlattr *attr;
  	struct nft_table *table;
  	struct nft_object *obj;
  	struct nft_ctx ctx;
  	u32 objtype;
  
  	if (!nla[NFTA_OBJ_TYPE] ||
  	    (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
  		return -EINVAL;
  
  	table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
  	if (IS_ERR(table)) {
  		NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
  		return PTR_ERR(table);
  	}
  
  	objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
  	if (nla[NFTA_OBJ_HANDLE]) {
  		attr = nla[NFTA_OBJ_HANDLE];
  		obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
  	} else {
  		attr = nla[NFTA_OBJ_NAME];
  		obj = nft_obj_lookup(net, table, attr, objtype, genmask);
  	}
  
  	if (IS_ERR(obj)) {
  		NL_SET_BAD_ATTR(extack, attr);
  		return PTR_ERR(obj);
  	}
  	if (obj->use > 0) {
  		NL_SET_BAD_ATTR(extack, attr);
  		return -EBUSY;
  	}
  
  	nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
  
  	return nft_delobj(&ctx, obj);
  }
  
  void nft_obj_notify(struct net *net, const struct nft_table *table,
  		    struct nft_object *obj, u32 portid, u32 seq, int event,
  		    int family, int report, gfp_t gfp)
  {
  	struct sk_buff *skb;
  	int err;
  	char *buf = kasprintf(gfp, "%s:%llu;?:0",
  			      table->name, table->handle);
  
  	audit_log_nfcfg(buf,
  			family,
  			obj->handle,
  			event == NFT_MSG_NEWOBJ ?
  				AUDIT_NFT_OP_OBJ_REGISTER :
  				AUDIT_NFT_OP_OBJ_UNREGISTER,
  			gfp);
  	kfree(buf);
  
  	if (!report &&
  	    !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
  		return;
  
  	skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
  	if (skb == NULL)
  		goto err;
  
  	err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
  				      table, obj, false);
  	if (err < 0) {
  		kfree_skb(skb);
  		goto err;
  	}
  
  	nft_notify_enqueue(skb, report, &net->nft.notify_list);
  	return;
  err:
  	nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
  }
  EXPORT_SYMBOL_GPL(nft_obj_notify);
  
  static void nf_tables_obj_notify(const struct nft_ctx *ctx,
  				 struct nft_object *obj, int event)
  {
  	nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
  		       ctx->family, ctx->report, GFP_KERNEL);
  }
  
  /*
   * Flow tables
   */
  void nft_register_flowtable_type(struct nf_flowtable_type *type)
  {
  	nfnl_lock(NFNL_SUBSYS_NFTABLES);
  	list_add_tail_rcu(&type->list, &nf_tables_flowtables);
  	nfnl_unlock(NFNL_SUBSYS_NFTABLES);
  }
  EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
  
  void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
  {
  	nfnl_lock(NFNL_SUBSYS_NFTABLES);
  	list_del_rcu(&type->list);
  	nfnl_unlock(NFNL_SUBSYS_NFTABLES);
  }
  EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
  
  static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
  	[NFTA_FLOWTABLE_TABLE]		= { .type = NLA_STRING,
  					    .len = NFT_NAME_MAXLEN - 1 },
  	[NFTA_FLOWTABLE_NAME]		= { .type = NLA_STRING,
  					    .len = NFT_NAME_MAXLEN - 1 },
  	[NFTA_FLOWTABLE_HOOK]		= { .type = NLA_NESTED },
  	[NFTA_FLOWTABLE_HANDLE]		= { .type = NLA_U64 },
  	[NFTA_FLOWTABLE_FLAGS]		= { .type = NLA_U32 },
  };
  
  struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
  					   const struct nlattr *nla, u8 genmask)
  {
  	struct nft_flowtable *flowtable;
  
  	list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
  		if (!nla_strcmp(nla, flowtable->name) &&
  		    nft_active_genmask(flowtable, genmask))
  			return flowtable;
  	}
  	return ERR_PTR(-ENOENT);
  }
  EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
  
  void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
  				    struct nft_flowtable *flowtable,
  				    enum nft_trans_phase phase)
  {
  	switch (phase) {
  	case NFT_TRANS_PREPARE:
  	case NFT_TRANS_ABORT:
  	case NFT_TRANS_RELEASE:
  		flowtable->use--;
  		fallthrough;
  	default:
  		return;
  	}
  }
  EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
  
  static struct nft_flowtable *
  nft_flowtable_lookup_byhandle(const struct nft_table *table,
  			      const struct nlattr *nla, u8 genmask)
  {
         struct nft_flowtable *flowtable;
  
         list_for_each_entry(flowtable, &table->flowtables, list) {
                 if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
                     nft_active_genmask(flowtable, genmask))
                         return flowtable;
         }
         return ERR_PTR(-ENOENT);
  }
  
  struct nft_flowtable_hook {
  	u32			num;
  	int			priority;
  	struct list_head	list;
  };
  
  static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
  	[NFTA_FLOWTABLE_HOOK_NUM]	= { .type = NLA_U32 },
  	[NFTA_FLOWTABLE_HOOK_PRIORITY]	= { .type = NLA_U32 },
  	[NFTA_FLOWTABLE_HOOK_DEVS]	= { .type = NLA_NESTED },
  };
  
  static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
  				    const struct nlattr *attr,
  				    struct nft_flowtable_hook *flowtable_hook,
  				    struct nft_flowtable *flowtable, bool add)
  {
  	struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
  	struct nft_hook *hook;
  	int hooknum, priority;
  	int err;
  
  	INIT_LIST_HEAD(&flowtable_hook->list);
  
  	err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
  					  nft_flowtable_hook_policy, NULL);
  	if (err < 0)
  		return err;
  
  	if (add) {
  		if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
  		    !tb[NFTA_FLOWTABLE_HOOK_PRIORITY])
  			return -EINVAL;
  
  		hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
  		if (hooknum != NF_NETDEV_INGRESS)
  			return -EOPNOTSUPP;
  
  		priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
  
  		flowtable_hook->priority	= priority;
  		flowtable_hook->num		= hooknum;
  	} else {
  		if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
  			hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
  			if (hooknum != flowtable->hooknum)
  				return -EOPNOTSUPP;
  		}
  
  		if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
  			priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
  			if (priority != flowtable->data.priority)
  				return -EOPNOTSUPP;
  		}
  
  		flowtable_hook->priority	= flowtable->data.priority;
  		flowtable_hook->num		= flowtable->hooknum;
  	}
  
  	if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
  		err = nf_tables_parse_netdev_hooks(ctx->net,
  						   tb[NFTA_FLOWTABLE_HOOK_DEVS],
  						   &flowtable_hook->list);
  		if (err < 0)
  			return err;
  	}
  
  	list_for_each_entry(hook, &flowtable_hook->list, list) {
  		hook->ops.pf		= NFPROTO_NETDEV;
  		hook->ops.hooknum	= flowtable_hook->num;
  		hook->ops.priority	= flowtable_hook->priority;
  		hook->ops.priv		= &flowtable->data;
  		hook->ops.hook		= flowtable->data.type->hook;
  	}
  
  	return err;
  }
  
  static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
  {
  	const struct nf_flowtable_type *type;
  
  	list_for_each_entry(type, &nf_tables_flowtables, list) {
  		if (family == type->family)
  			return type;
  	}
  	return NULL;
  }
  
  static const struct nf_flowtable_type *
  nft_flowtable_type_get(struct net *net, u8 family)
  {
  	const struct nf_flowtable_type *type;
  
  	type = __nft_flowtable_type_get(family);
  	if (type != NULL && try_module_get(type->owner))
  		return type;
  
  	lockdep_nfnl_nft_mutex_not_held();
  #ifdef CONFIG_MODULES
  	if (type == NULL) {
  		if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
  			return ERR_PTR(-EAGAIN);
  	}
  #endif
  	return ERR_PTR(-ENOENT);
  }
  
  /* Only called from error and netdev event paths. */
  static void nft_unregister_flowtable_hook(struct net *net,
  					  struct nft_flowtable *flowtable,
  					  struct nft_hook *hook)
  {
  	nf_unregister_net_hook(net, &hook->ops);
  	flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
  				    FLOW_BLOCK_UNBIND);
  }
  
  static void nft_unregister_flowtable_net_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 nft_register_flowtable_net_hooks(struct net *net,
  					    struct nft_table *table,
  					    struct list_head *hook_list,
  					    struct nft_flowtable *flowtable)
  {
  	struct nft_hook *hook, *hook2, *next;
  	struct nft_flowtable *ft;
  	int err, i = 0;
  
  	list_for_each_entry(hook, hook_list, list) {
  		list_for_each_entry(ft, &table->flowtables, list) {
  			if (!nft_is_active_next(net, ft))
  				continue;
  
  			list_for_each_entry(hook2, &ft->hook_list, list) {
  				if (hook->ops.dev == hook2->ops.dev &&
  				    hook->ops.pf == hook2->ops.pf) {
  					err = -EEXIST;
  					goto err_unregister_net_hooks;
  				}
  			}
  		}
  
  		err = flowtable->data.type->setup(&flowtable->data,
  						  hook->ops.dev,
  						  FLOW_BLOCK_BIND);
  		if (err < 0)
  			goto err_unregister_net_hooks;
  
  		err = nf_register_net_hook(net, &hook->ops);
  		if (err < 0) {
  			flowtable->data.type->setup(&flowtable->data,
  						    hook->ops.dev,
  						    FLOW_BLOCK_UNBIND);
  			goto err_unregister_net_hooks;
  		}
  
  		i++;
  	}
  
  	return 0;
  
  err_unregister_net_hooks:
  	list_for_each_entry_safe(hook, next, hook_list, list) {
  		if (i-- <= 0)
  			break;
  
  		nft_unregister_flowtable_hook(net, flowtable, hook);
  		list_del_rcu(&hook->list);
  		kfree_rcu(hook, rcu);
  	}
  
  	return err;
  }
  
  static void nft_flowtable_hooks_destroy(struct list_head *hook_list)
  {
  	struct nft_hook *hook, *next;
  
  	list_for_each_entry_safe(hook, next, hook_list, list) {
  		list_del_rcu(&hook->list);
  		kfree_rcu(hook, rcu);
  	}
  }
  
  static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
  				struct nft_flowtable *flowtable)
  {
  	const struct nlattr * const *nla = ctx->nla;
  	struct nft_flowtable_hook flowtable_hook;
  	struct nft_hook *hook, *next;
  	struct nft_trans *trans;
  	bool unregister = false;
  	u32 flags;
  	int err;
  
  	err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
  				       &flowtable_hook, flowtable, false);
  	if (err < 0)
  		return err;
  
  	list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
  		if (nft_hook_list_find(&flowtable->hook_list, hook)) {
  			list_del(&hook->list);
  			kfree(hook);
  		}
  	}
  
  	if (nla[NFTA_FLOWTABLE_FLAGS]) {
  		flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
  		if (flags & ~NFT_FLOWTABLE_MASK)
  			return -EOPNOTSUPP;
  		if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
  		    (flags & NFT_FLOWTABLE_HW_OFFLOAD))
  			return -EOPNOTSUPP;
  	} else {
  		flags = flowtable->data.flags;
  	}
  
  	err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
  					       &flowtable_hook.list, flowtable);
  	if (err < 0)
  		goto err_flowtable_update_hook;
  
  	trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
  				sizeof(struct nft_trans_flowtable));
  	if (!trans) {
  		unregister = true;
  		err = -ENOMEM;
  		goto err_flowtable_update_hook;
  	}
  
  	nft_trans_flowtable_flags(trans) = flags;
  	nft_trans_flowtable(trans) = flowtable;
  	nft_trans_flowtable_update(trans) = true;
  	INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
  	list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
  
  	list_add_tail(&trans->list, &ctx->net->nft.commit_list);
  
  	return 0;
  
  err_flowtable_update_hook:
  	list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
  		if (unregister)
  			nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
  		list_del_rcu(&hook->list);
  		kfree_rcu(hook, rcu);
  	}
  
  	return err;
  
  }
  
  static int nf_tables_newflowtable(struct net *net, struct sock *nlsk,
  				  struct sk_buff *skb,
  				  const struct nlmsghdr *nlh,
  				  const struct nlattr * const nla[],
  				  struct netlink_ext_ack *extack)
  {
  	const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
  	struct nft_flowtable_hook flowtable_hook;
  	const struct nf_flowtable_type *type;
  	u8 genmask = nft_genmask_next(net);
  	int family = nfmsg->nfgen_family;
  	struct nft_flowtable *flowtable;
  	struct nft_hook *hook, *next;
  	struct nft_table *table;
  	struct nft_ctx ctx;
  	int err;
  
  	if (!nla[NFTA_FLOWTABLE_TABLE] ||
  	    !nla[NFTA_FLOWTABLE_NAME] ||
  	    !nla[NFTA_FLOWTABLE_HOOK])
  		return -EINVAL;
  
  	table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
  				 genmask);
  	if (IS_ERR(table)) {
  		NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
  		return PTR_ERR(table);
  	}
  
  	flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
  					 genmask);
  	if (IS_ERR(flowtable)) {
  		err = PTR_ERR(flowtable);
  		if (err != -ENOENT) {
  			NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
  			return err;
  		}
  	} else {
  		if (nlh->nlmsg_flags & NLM_F_EXCL) {
  			NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
  			return -EEXIST;
  		}
  
  		nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
  
  		return nft_flowtable_update(&ctx, nlh, flowtable);
  	}
  
  	nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
  
  	flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL);
  	if (!flowtable)
  		return -ENOMEM;
  
  	flowtable->table = table;
  	flowtable->handle = nf_tables_alloc_handle(table);
  	INIT_LIST_HEAD(&flowtable->hook_list);
  
  	flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL);
  	if (!flowtable->name) {
  		err = -ENOMEM;
  		goto err1;
  	}
  
  	type = nft_flowtable_type_get(net, family);
  	if (IS_ERR(type)) {
  		err = PTR_ERR(type);
  		goto err2;
  	}
  
  	if (nla[NFTA_FLOWTABLE_FLAGS]) {
  		flowtable->data.flags =
  			ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
  		if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
  			err = -EOPNOTSUPP;
  			goto err3;
  		}
  	}
  
  	write_pnet(&flowtable->data.net, net);
  	flowtable->data.type = type;
  	err = type->init(&flowtable->data);
  	if (err < 0)
  		goto err3;
  
  	err = nft_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
  				       &flowtable_hook, flowtable, true);
  	if (err < 0)
  		goto err4;
  
  	list_splice(&flowtable_hook.list, &flowtable->hook_list);
  	flowtable->data.priority = flowtable_hook.priority;
  	flowtable->hooknum = flowtable_hook.num;
  
  	err = nft_register_flowtable_net_hooks(ctx.net, table,
  					       &flowtable->hook_list,
  					       flowtable);
  	if (err < 0) {
  		nft_flowtable_hooks_destroy(&flowtable->hook_list);
  		goto err4;
  	}
  
  	err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
  	if (err < 0)
  		goto err5;
  
  	list_add_tail_rcu(&flowtable->list, &table->flowtables);
  	table->use++;
  
  	return 0;
  err5:
  	list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
  		nft_unregister_flowtable_hook(net, flowtable, hook);
  		list_del_rcu(&hook->list);
  		kfree_rcu(hook, rcu);
  	}
  err4:
  	flowtable->data.type->free(&flowtable->data);
  err3:
  	module_put(type->owner);
  err2:
  	kfree(flowtable->name);
  err1:
  	kfree(flowtable);
  	return err;
  }
  
  static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
  {
  	struct nft_hook *this, *next;
  
  	list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
  		list_del(&this->list);
  		kfree(this);
  	}
  }
  
  static int nft_delflowtable_hook(struct nft_ctx *ctx,
  				 struct nft_flowtable *flowtable)
  {
  	const struct nlattr * const *nla = ctx->nla;
  	struct nft_flowtable_hook flowtable_hook;
  	struct nft_hook *this, *hook;
  	struct nft_trans *trans;
  	int err;
  
  	err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
  				       &flowtable_hook, flowtable, false);
  	if (err < 0)
  		return err;
  
  	list_for_each_entry(this, &flowtable_hook.list, list) {
  		hook = nft_hook_list_find(&flowtable->hook_list, this);
  		if (!hook) {
  			err = -ENOENT;
  			goto err_flowtable_del_hook;
  		}
  		hook->inactive = true;
  	}
  
  	trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
  				sizeof(struct nft_trans_flowtable));
  	if (!trans) {
  		err = -ENOMEM;
  		goto err_flowtable_del_hook;
  	}
  
  	nft_trans_flowtable(trans) = flowtable;
  	nft_trans_flowtable_update(trans) = true;
  	INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
  	nft_flowtable_hook_release(&flowtable_hook);
  
  	list_add_tail(&trans->list, &ctx->net->nft.commit_list);
  
  	return 0;
  
  err_flowtable_del_hook:
  	list_for_each_entry(this, &flowtable_hook.list, list) {
  		hook = nft_hook_list_find(&flowtable->hook_list, this);
  		if (!hook)
  			break;
  
  		hook->inactive = false;
  	}
  	nft_flowtable_hook_release(&flowtable_hook);
  
  	return err;
  }
  
  static int nf_tables_delflowtable(struct net *net, struct sock *nlsk,
  				  struct sk_buff *skb,
  				  const struct nlmsghdr *nlh,
  				  const struct nlattr * const nla[],
  				  struct netlink_ext_ack *extack)
  {
  	const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
  	u8 genmask = nft_genmask_next(net);
  	int family = nfmsg->nfgen_family;
  	struct nft_flowtable *flowtable;
  	const struct nlattr *attr;
  	struct nft_table *table;
  	struct nft_ctx ctx;
  
  	if (!nla[NFTA_FLOWTABLE_TABLE] ||
  	    (!nla[NFTA_FLOWTABLE_NAME] &&
  	     !nla[NFTA_FLOWTABLE_HANDLE]))
  		return -EINVAL;
  
  	table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
  				 genmask);
  	if (IS_ERR(table)) {
  		NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
  		return PTR_ERR(table);
  	}
  
  	if (nla[NFTA_FLOWTABLE_HANDLE]) {
  		attr = nla[NFTA_FLOWTABLE_HANDLE];
  		flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
  	} else {
  		attr = nla[NFTA_FLOWTABLE_NAME];
  		flowtable = nft_flowtable_lookup(table, attr, genmask);
  	}
  
  	if (IS_ERR(flowtable)) {
  		NL_SET_BAD_ATTR(extack, attr);
  		return PTR_ERR(flowtable);
  	}
  
  	nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
  
  	if (nla[NFTA_FLOWTABLE_HOOK])
  		return nft_delflowtable_hook(&ctx, flowtable);
  
  	if (flowtable->use > 0) {
  		NL_SET_BAD_ATTR(extack, attr);
  		return -EBUSY;
  	}
  
  	return nft_delflowtable(&ctx, flowtable);
  }
  
  static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
  					 u32 portid, u32 seq, int event,
  					 u32 flags, int family,
  					 struct nft_flowtable *flowtable,
  					 struct list_head *hook_list)
  {
  	struct nlattr *nest, *nest_devs;
  	struct nfgenmsg *nfmsg;
  	struct nft_hook *hook;
  	struct nlmsghdr *nlh;
  
  	event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
  	nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
  	if (nlh == NULL)
  		goto nla_put_failure;
  
  	nfmsg = nlmsg_data(nlh);
  	nfmsg->nfgen_family	= family;
  	nfmsg->version		= NFNETLINK_V0;
  	nfmsg->res_id		= htons(net->nft.base_seq & 0xffff);
  
  	if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
  	    nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
  	    nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
  	    nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
  			 NFTA_FLOWTABLE_PAD) ||
  	    nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
  		goto nla_put_failure;
  
  	nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
  	if (!nest)
  		goto nla_put_failure;
  	if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
  	    nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
  		goto nla_put_failure;
  
  	nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
  	if (!nest_devs)
  		goto nla_put_failure;
  
  	list_for_each_entry_rcu(hook, hook_list, list) {
  		if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
  			goto nla_put_failure;
  	}
  	nla_nest_end(skb, nest_devs);
  	nla_nest_end(skb, nest);
  
  	nlmsg_end(skb, nlh);
  	return 0;
  
  nla_put_failure:
  	nlmsg_trim(skb, nlh);
  	return -1;
  }
  
  struct nft_flowtable_filter {
  	char		*table;
  };
  
  static int nf_tables_dump_flowtable(struct sk_buff *skb,
  				    struct netlink_callback *cb)
  {
  	const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
  	struct nft_flowtable_filter *filter = cb->data;
  	unsigned int idx = 0, s_idx = cb->args[0];
  	struct net *net = sock_net(skb->sk);
  	int family = nfmsg->nfgen_family;
  	struct nft_flowtable *flowtable;
  	const struct nft_table *table;
  
  	rcu_read_lock();
  	cb->seq = net->nft.base_seq;
  
  	list_for_each_entry_rcu(table, &net->nft.tables, list) {
  		if (family != NFPROTO_UNSPEC && family != table->family)
  			continue;
  
  		list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
  			if (!nft_is_active(net, flowtable))
  				goto cont;
  			if (idx < s_idx)
  				goto cont;
  			if (idx > s_idx)
  				memset(&cb->args[1], 0,
  				       sizeof(cb->args) - sizeof(cb->args[0]));
  			if (filter && filter->table &&
  			    strcmp(filter->table, table->name))
  				goto cont;
  
  			if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
  							  cb->nlh->nlmsg_seq,
  							  NFT_MSG_NEWFLOWTABLE,
  							  NLM_F_MULTI | NLM_F_APPEND,
  							  table->family,
  							  flowtable,
  							  &flowtable->hook_list) < 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 nf_tables_dump_flowtable_start(struct netlink_callback *cb)
  {
  	const struct nlattr * const *nla = cb->data;
  	struct nft_flowtable_filter *filter = NULL;
  
  	if (nla[NFTA_FLOWTABLE_TABLE]) {
  		filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
  		if (!filter)
  			return -ENOMEM;
  
  		filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
  					   GFP_ATOMIC);
  		if (!filter->table) {
  			kfree(filter);
  			return -ENOMEM;
  		}
  	}
  
  	cb->data = filter;
  	return 0;
  }
  
  static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
  {
  	struct nft_flowtable_filter *filter = cb->data;
  
  	if (!filter)
  		return 0;
  
  	kfree(filter->table);
  	kfree(filter);
  
  	return 0;
  }
  
  /* called with rcu_read_lock held */
  static int nf_tables_getflowtable(struct net *net, struct sock *nlsk,
  				  struct sk_buff *skb,
  				  const struct nlmsghdr *nlh,
  				  const struct nlattr * const nla[],
  				  struct netlink_ext_ack *extack)
  {
  	const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
  	u8 genmask = nft_genmask_cur(net);
  	int family = nfmsg->nfgen_family;
  	struct nft_flowtable *flowtable;
  	const struct nft_table *table;
  	struct sk_buff *skb2;
  	int err;
  
  	if (nlh->nlmsg_flags & NLM_F_DUMP) {
  		struct netlink_dump_control c = {
  			.start = nf_tables_dump_flowtable_start,
  			.dump = nf_tables_dump_flowtable,
  			.done = nf_tables_dump_flowtable_done,
  			.module = THIS_MODULE,
  			.data = (void *)nla,
  		};
  
  		return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
  	}
  
  	if (!nla[NFTA_FLOWTABLE_NAME])
  		return -EINVAL;
  
  	table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
  				 genmask);
  	if (IS_ERR(table))
  		return PTR_ERR(table);
  
  	flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
  					 genmask);
  	if (IS_ERR(flowtable))
  		return PTR_ERR(flowtable);
  
  	skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
  	if (!skb2)
  		return -ENOMEM;
  
  	err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
  					    nlh->nlmsg_seq,
  					    NFT_MSG_NEWFLOWTABLE, 0, family,
  					    flowtable, &flowtable->hook_list);
  	if (err < 0)
  		goto err_fill_flowtable_info;
  
  	return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
  
  err_fill_flowtable_info:
  	kfree_skb(skb2);
  	return err;
  }
  
  static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
  				       struct nft_flowtable *flowtable,
  				       struct list_head *hook_list,
  				       int event)
  {
  	struct sk_buff *skb;
  	int err;
  	char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
  			      flowtable->table->name, flowtable->table->handle,
  			      flowtable->name, flowtable->handle);
  
  	audit_log_nfcfg(buf,
  			ctx->family,
  			flowtable->hooknum,
  			event == NFT_MSG_NEWFLOWTABLE ?
  				AUDIT_NFT_OP_FLOWTABLE_REGISTER :
  				AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
  			GFP_KERNEL);
  	kfree(buf);
  
  	if (!ctx->report &&
  	    !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
  		return;
  
  	skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
  	if (skb == NULL)
  		goto err;
  
  	err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
  					    ctx->seq, event, 0,
  					    ctx->family, flowtable, hook_list);
  	if (err < 0) {
  		kfree_skb(skb);
  		goto err;
  	}
  
  	nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
  	return;
  err:
  	nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
  }
  
  static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
  {
  	struct nft_hook *hook, *next;
  
  	flowtable->data.type->free(&flowtable->data);
  	list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
  		flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
  					    FLOW_BLOCK_UNBIND);
  		list_del_rcu(&hook->list);
  		kfree(hook);
  	}
  	kfree(flowtable->name);
  	module_put(flowtable->data.type->owner);
  	kfree(flowtable);
  }
  
  static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
  				   u32 portid, u32 seq)
  {
  	struct nlmsghdr *nlh;
  	struct nfgenmsg *nfmsg;
  	char buf[TASK_COMM_LEN];
  	int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
  
  	nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
  	if (nlh == NULL)
  		goto nla_put_failure;
  
  	nfmsg = nlmsg_data(nlh);
  	nfmsg->nfgen_family	= AF_UNSPEC;
  	nfmsg->version		= NFNETLINK_V0;
  	nfmsg->res_id		= htons(net->nft.base_seq & 0xffff);
  
  	if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)) ||
  	    nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
  	    nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
  		goto nla_put_failure;
  
  	nlmsg_end(skb, nlh);
  	return 0;
  
  nla_put_failure:
  	nlmsg_trim(skb, nlh);
  	return -EMSGSIZE;
  }
  
  static void nft_flowtable_event(unsigned long event, struct net_device *dev,
  				struct nft_flowtable *flowtable)
  {
  	struct nft_hook *hook;
  
  	list_for_each_entry(hook, &flowtable->hook_list, list) {
  		if (hook->ops.dev != dev)
  			continue;
  
  		/* flow_offload_netdev_event() cleans up entries for us. */
  		nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
  		list_del_rcu(&hook->list);
  		kfree_rcu(hook, rcu);
  		break;
  	}
  }
  
  static int nf_tables_flowtable_event(struct notifier_block *this,
  				     unsigned long event, void *ptr)
  {
  	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
  	struct nft_flowtable *flowtable;
  	struct nft_table *table;
  	struct net *net;
  
  	if (event != NETDEV_UNREGISTER)
  		return 0;
  
  	net = dev_net(dev);
  	mutex_lock(&net->nft.commit_mutex);
  	list_for_each_entry(table, &net->nft.tables, list) {
  		list_for_each_entry(flowtable, &table->flowtables, list) {
  			nft_flowtable_event(event, dev, flowtable);
  		}
  	}
  	mutex_unlock(&net->nft.commit_mutex);
  
  	return NOTIFY_DONE;
  }
  
  static struct notifier_block nf_tables_flowtable_notifier = {
  	.notifier_call	= nf_tables_flowtable_event,
  };
  
  static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
  				 int event)
  {
  	struct nlmsghdr *nlh = nlmsg_hdr(skb);
  	struct sk_buff *skb2;
  	int err;
  
  	audit_log_nfcfg("?:0;?:0", 0, net->nft.base_seq,
  			AUDIT_NFT_OP_GEN_REGISTER, GFP_KERNEL);
  
  	if (!nlmsg_report(nlh) &&
  	    !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
  		return;
  
  	skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
  	if (skb2 == NULL)
  		goto err;
  
  	err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
  				      nlh->nlmsg_seq);
  	if (err < 0) {
  		kfree_skb(skb2);
  		goto err;
  	}
  
  	nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
  		       nlmsg_report(nlh), GFP_KERNEL);
  	return;
  err:
  	nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
  			  -ENOBUFS);
  }
  
  static int nf_tables_getgen(struct net *net, struct sock *nlsk,
  			    struct sk_buff *skb, const struct nlmsghdr *nlh,
  			    const struct nlattr * const nla[],
  			    struct netlink_ext_ack *extack)
  {
  	struct sk_buff *skb2;
  	int err;
  
  	skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
  	if (skb2 == NULL)
  		return -ENOMEM;
  
  	err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
  				      nlh->nlmsg_seq);
  	if (err < 0)
  		goto err_fill_gen_info;
  
  	return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
  
  err_fill_gen_info:
  	kfree_skb(skb2);
  	return err;
  }
  
  static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
  	[NFT_MSG_NEWTABLE] = {
  		.call_batch	= nf_tables_newtable,
  		.attr_count	= NFTA_TABLE_MAX,
  		.policy		= nft_table_policy,
  	},
  	[NFT_MSG_GETTABLE] = {
  		.call_rcu	= nf_tables_gettable,
  		.attr_count	= NFTA_TABLE_MAX,
  		.policy		= nft_table_policy,
  	},
  	[NFT_MSG_DELTABLE] = {
  		.call_batch	= nf_tables_deltable,
  		.attr_count	= NFTA_TABLE_MAX,
  		.policy		= nft_table_policy,
  	},
  	[NFT_MSG_NEWCHAIN] = {
  		.call_batch	= nf_tables_newchain,
  		.attr_count	= NFTA_CHAIN_MAX,
  		.policy		= nft_chain_policy,
  	},
  	[NFT_MSG_GETCHAIN] = {
  		.call_rcu	= nf_tables_getchain,
  		.attr_count	= NFTA_CHAIN_MAX,
  		.policy		= nft_chain_policy,
  	},
  	[NFT_MSG_DELCHAIN] = {
  		.call_batch	= nf_tables_delchain,
  		.attr_count	= NFTA_CHAIN_MAX,
  		.policy		= nft_chain_policy,
  	},
  	[NFT_MSG_NEWRULE] = {
  		.call_batch	= nf_tables_newrule,
  		.attr_count	= NFTA_RULE_MAX,
  		.policy		= nft_rule_policy,
  	},
  	[NFT_MSG_GETRULE] = {
  		.call_rcu	= nf_tables_getrule,
  		.attr_count	= NFTA_RULE_MAX,
  		.policy		= nft_rule_policy,
  	},
  	[NFT_MSG_DELRULE] = {
  		.call_batch	= nf_tables_delrule,
  		.attr_count	= NFTA_RULE_MAX,
  		.policy		= nft_rule_policy,
  	},
  	[NFT_MSG_NEWSET] = {
  		.call_batch	= nf_tables_newset,
  		.attr_count	= NFTA_SET_MAX,
  		.policy		= nft_set_policy,
  	},
  	[NFT_MSG_GETSET] = {
  		.call_rcu	= nf_tables_getset,
  		.attr_count	= NFTA_SET_MAX,
  		.policy		= nft_set_policy,
  	},
  	[NFT_MSG_DELSET] = {
  		.call_batch	= nf_tables_delset,
  		.attr_count	= NFTA_SET_MAX,
  		.policy		= nft_set_policy,
  	},
  	[NFT_MSG_NEWSETELEM] = {
  		.call_batch	= nf_tables_newsetelem,
  		.attr_count	= NFTA_SET_ELEM_LIST_MAX,
  		.policy		= nft_set_elem_list_policy,
  	},
  	[NFT_MSG_GETSETELEM] = {
  		.call_rcu	= nf_tables_getsetelem,
  		.attr_count	= NFTA_SET_ELEM_LIST_MAX,
  		.policy		= nft_set_elem_list_policy,
  	},
  	[NFT_MSG_DELSETELEM] = {
  		.call_batch	= nf_tables_delsetelem,
  		.attr_count	= NFTA_SET_ELEM_LIST_MAX,
  		.policy		= nft_set_elem_list_policy,
  	},
  	[NFT_MSG_GETGEN] = {
  		.call_rcu	= nf_tables_getgen,
  	},
  	[NFT_MSG_NEWOBJ] = {
  		.call_batch	= nf_tables_newobj,
  		.attr_count	= NFTA_OBJ_MAX,
  		.policy		= nft_obj_policy,
  	},
  	[NFT_MSG_GETOBJ] = {
  		.call_rcu	= nf_tables_getobj,
  		.attr_count	= NFTA_OBJ_MAX,
  		.policy		= nft_obj_policy,
  	},
  	[NFT_MSG_DELOBJ] = {
  		.call_batch	= nf_tables_delobj,
  		.attr_count	= NFTA_OBJ_MAX,
  		.policy		= nft_obj_policy,
  	},
  	[NFT_MSG_GETOBJ_RESET] = {
  		.call_rcu	= nf_tables_getobj,
  		.attr_count	= NFTA_OBJ_MAX,
  		.policy		= nft_obj_policy,
  	},
  	[NFT_MSG_NEWFLOWTABLE] = {
  		.call_batch	= nf_tables_newflowtable,
  		.attr_count	= NFTA_FLOWTABLE_MAX,
  		.policy		= nft_flowtable_policy,
  	},
  	[NFT_MSG_GETFLOWTABLE] = {
  		.call_rcu	= nf_tables_getflowtable,
  		.attr_count	= NFTA_FLOWTABLE_MAX,
  		.policy		= nft_flowtable_policy,
  	},
  	[NFT_MSG_DELFLOWTABLE] = {
  		.call_batch	= nf_tables_delflowtable,
  		.attr_count	= NFTA_FLOWTABLE_MAX,
  		.policy		= nft_flowtable_policy,
  	},
  };
  
  static int nf_tables_validate(struct net *net)
  {
  	struct nft_table *table;
  
  	switch (net->nft.validate_state) {
  	case NFT_VALIDATE_SKIP:
  		break;
  	case NFT_VALIDATE_NEED:
  		nft_validate_state_update(net, NFT_VALIDATE_DO);
  		fallthrough;
  	case NFT_VALIDATE_DO:
  		list_for_each_entry(table, &net->nft.tables, list) {
  			if (nft_table_validate(net, table) < 0)
  				return -EAGAIN;
  		}
  		break;
  	}
  
  	return 0;
  }
  
  /* a drop policy has to be deferred until all rules have been activated,
   * otherwise a large ruleset that contains a drop-policy base chain will
   * cause all packets to get dropped until the full transaction has been
   * processed.
   *
   * We defer the drop policy until the transaction has been finalized.
   */
  static void nft_chain_commit_drop_policy(struct nft_trans *trans)
  {
  	struct nft_base_chain *basechain;
  
  	if (nft_trans_chain_policy(trans) != NF_DROP)
  		return;
  
  	if (!nft_is_base_chain(trans->ctx.chain))
  		return;
  
  	basechain = nft_base_chain(trans->ctx.chain);
  	basechain->policy = NF_DROP;
  }
  
  static void nft_chain_commit_update(struct nft_trans *trans)
  {
  	struct nft_base_chain *basechain;
  
  	if (nft_trans_chain_name(trans)) {
  		rhltable_remove(&trans->ctx.table->chains_ht,
  				&trans->ctx.chain->rhlhead,
  				nft_chain_ht_params);
  		swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
  		rhltable_insert_key(&trans->ctx.table->chains_ht,
  				    trans->ctx.chain->name,
  				    &trans->ctx.chain->rhlhead,
  				    nft_chain_ht_params);
  	}
  
  	if (!nft_is_base_chain(trans->ctx.chain))
  		return;
  
  	nft_chain_stats_replace(trans);
  
  	basechain = nft_base_chain(trans->ctx.chain);
  
  	switch (nft_trans_chain_policy(trans)) {
  	case NF_DROP:
  	case NF_ACCEPT:
  		basechain->policy = nft_trans_chain_policy(trans);
  		break;
  	}
  }
  
  static void nft_obj_commit_update(struct nft_trans *trans)
  {
  	struct nft_object *newobj;
  	struct nft_object *obj;
  
  	obj = nft_trans_obj(trans);
  	newobj = nft_trans_obj_newobj(trans);
  
  	if (obj->ops->update)
  		obj->ops->update(obj, newobj);
  
  	kfree(newobj);
  }
  
  static void nft_commit_release(struct nft_trans *trans)
  {
  	switch (trans->msg_type) {
  	case NFT_MSG_DELTABLE:
  		nf_tables_table_destroy(&trans->ctx);
  		break;
  	case NFT_MSG_NEWCHAIN:
  		free_percpu(nft_trans_chain_stats(trans));
  		kfree(nft_trans_chain_name(trans));
  		break;
  	case NFT_MSG_DELCHAIN:
  		nf_tables_chain_destroy(&trans->ctx);
  		break;
  	case NFT_MSG_DELRULE:
  		nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
  		break;
  	case NFT_MSG_DELSET:
  		nft_set_destroy(&trans->ctx, nft_trans_set(trans));
  		break;
  	case NFT_MSG_DELSETELEM:
  		nf_tables_set_elem_destroy(&trans->ctx,
  					   nft_trans_elem_set(trans),
  					   nft_trans_elem(trans).priv);
  		break;
  	case NFT_MSG_DELOBJ:
  		nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
  		break;
  	case NFT_MSG_DELFLOWTABLE:
  		if (nft_trans_flowtable_update(trans))
  			nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
  		else
  			nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
  		break;
  	}
  
  	if (trans->put_net)
  		put_net(trans->ctx.net);
  
  	kfree(trans);
  }
  
  static void nf_tables_trans_destroy_work(struct work_struct *w)
  {
  	struct nft_trans *trans, *next;
  	LIST_HEAD(head);
  
  	spin_lock(&nf_tables_destroy_list_lock);
  	list_splice_init(&nf_tables_destroy_list, &head);
  	spin_unlock(&nf_tables_destroy_list_lock);
  
  	if (list_empty(&head))
  		return;
  
  	synchronize_rcu();
  
  	list_for_each_entry_safe(trans, next, &head, list) {
  		list_del(&trans->list);
  		nft_commit_release(trans);
  	}
  }
  
  void nf_tables_trans_destroy_flush_work(void)
  {
  	flush_work(&trans_destroy_work);
  }
  EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
  
  static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
  {
  	struct nft_rule *rule;
  	unsigned int alloc = 0;
  	int i;
  
  	/* already handled or inactive chain? */
  	if (chain->rules_next || !nft_is_active_next(net, chain))
  		return 0;
  
  	rule = list_entry(&chain->rules, struct nft_rule, list);
  	i = 0;
  
  	list_for_each_entry_continue(rule, &chain->rules, list) {
  		if (nft_is_active_next(net, rule))
  			alloc++;
  	}
  
  	chain->rules_next = nf_tables_chain_alloc_rules(chain, alloc);
  	if (!chain->rules_next)
  		return -ENOMEM;
  
  	list_for_each_entry_continue(rule, &chain->rules, list) {
  		if (nft_is_active_next(net, rule))
  			chain->rules_next[i++] = rule;
  	}
  
  	chain->rules_next[i] = NULL;
  	return 0;
  }
  
  static void nf_tables_commit_chain_prepare_cancel(struct net *net)
  {
  	struct nft_trans *trans, *next;
  
  	list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
  		struct nft_chain *chain = trans->ctx.chain;
  
  		if (trans->msg_type == NFT_MSG_NEWRULE ||
  		    trans->msg_type == NFT_MSG_DELRULE) {
  			kvfree(chain->rules_next);
  			chain->rules_next = NULL;
  		}
  	}
  }
  
  static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
  {
  	struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
  
  	kvfree(o->start);
  }
  
  static void nf_tables_commit_chain_free_rules_old(struct nft_rule **rules)
  {
  	struct nft_rule **r = rules;
  	struct nft_rules_old *old;
  
  	while (*r)
  		r++;
  
  	r++;	/* rcu_head is after end marker */
  	old = (void *) r;
  	old->start = rules;
  
  	call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
  }
  
  static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
  {
  	struct nft_rule **g0, **g1;
  	bool next_genbit;
  
  	next_genbit = nft_gencursor_next(net);
  
  	g0 = rcu_dereference_protected(chain->rules_gen_0,
  				       lockdep_commit_lock_is_held(net));
  	g1 = rcu_dereference_protected(chain->rules_gen_1,
  				       lockdep_commit_lock_is_held(net));
  
  	/* No changes to this chain? */
  	if (chain->rules_next == NULL) {
  		/* chain had no change in last or next generation */
  		if (g0 == g1)
  			return;
  		/*
  		 * chain had no change in this generation; make sure next
  		 * one uses same rules as current generation.
  		 */
  		if (next_genbit) {
  			rcu_assign_pointer(chain->rules_gen_1, g0);
  			nf_tables_commit_chain_free_rules_old(g1);
  		} else {
  			rcu_assign_pointer(chain->rules_gen_0, g1);
  			nf_tables_commit_chain_free_rules_old(g0);
  		}
  
  		return;
  	}
  
  	if (next_genbit)
  		rcu_assign_pointer(chain->rules_gen_1, chain->rules_next);
  	else
  		rcu_assign_pointer(chain->rules_gen_0, chain->rules_next);
  
  	chain->rules_next = NULL;
  
  	if (g0 == g1)
  		return;
  
  	if (next_genbit)
  		nf_tables_commit_chain_free_rules_old(g1);
  	else
  		nf_tables_commit_chain_free_rules_old(g0);
  }
  
  static void nft_obj_del(struct nft_object *obj)
  {
  	rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
  	list_del_rcu(&obj->list);
  }
  
  void nft_chain_del(struct nft_chain *chain)
  {
  	struct nft_table *table = chain->table;
  
  	WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
  				     nft_chain_ht_params));
  	list_del_rcu(&chain->list);
  }
  
  static void nft_flowtable_hooks_del(struct nft_flowtable *flowtable,
  				    struct list_head *hook_list)
  {
  	struct nft_hook *hook, *next;
  
  	list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
  		if (hook->inactive)
  			list_move(&hook->list, hook_list);
  	}
  }
  
  static void nf_tables_module_autoload_cleanup(struct net *net)
  {
  	struct nft_module_request *req, *next;
  
  	WARN_ON_ONCE(!list_empty(&net->nft.commit_list));
  	list_for_each_entry_safe(req, next, &net->nft.module_list, list) {
  		WARN_ON_ONCE(!req->done);
  		list_del(&req->list);
  		kfree(req);
  	}
  }
  
  static void nf_tables_commit_release(struct net *net)
  {
  	struct nft_trans *trans;
  
  	/* all side effects have to be made visible.
  	 * For example, if a chain named 'foo' has been deleted, a
  	 * new transaction must not find it anymore.
  	 *
  	 * Memory reclaim happens asynchronously from work queue
  	 * to prevent expensive synchronize_rcu() in commit phase.
  	 */
  	if (list_empty(&net->nft.commit_list)) {
  		nf_tables_module_autoload_cleanup(net);
  		mutex_unlock(&net->nft.commit_mutex);
  		return;
  	}
  
  	trans = list_last_entry(&net->nft.commit_list,
  				struct nft_trans, list);
  	get_net(trans->ctx.net);
  	WARN_ON_ONCE(trans->put_net);
  
  	trans->put_net = true;
  	spin_lock(&nf_tables_destroy_list_lock);
  	list_splice_tail_init(&net->nft.commit_list, &nf_tables_destroy_list);
  	spin_unlock(&nf_tables_destroy_list_lock);
  
  	nf_tables_module_autoload_cleanup(net);
  	schedule_work(&trans_destroy_work);
  
  	mutex_unlock(&net->nft.commit_mutex);
  }
  
  static void nft_commit_notify(struct net *net, u32 portid)
  {
  	struct sk_buff *batch_skb = NULL, *nskb, *skb;
  	unsigned char *data;
  	int len;
  
  	list_for_each_entry_safe(skb, nskb, &net->nft.notify_list, list) {
  		if (!batch_skb) {
  new_batch:
  			batch_skb = skb;
  			len = NLMSG_GOODSIZE - skb->len;
  			list_del(&skb->list);
  			continue;
  		}
  		len -= skb->len;
  		if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
  			data = skb_put(batch_skb, skb->len);
  			memcpy(data, skb->data, skb->len);
  			list_del(&skb->list);
  			kfree_skb(skb);
  			continue;
  		}
  		nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
  			       NFT_CB(batch_skb).report, GFP_KERNEL);
  		goto new_batch;
  	}
  
  	if (batch_skb) {
  		nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
  			       NFT_CB(batch_skb).report, GFP_KERNEL);
  	}
  
  	WARN_ON_ONCE(!list_empty(&net->nft.notify_list));
  }
  
  static int nf_tables_commit(struct net *net, struct sk_buff *skb)
  {
  	struct nft_trans *trans, *next;
  	struct nft_trans_elem *te;
  	struct nft_chain *chain;
  	struct nft_table *table;
  	int err;
  
  	if (list_empty(&net->nft.commit_list)) {
  		mutex_unlock(&net->nft.commit_mutex);
  		return 0;
  	}
  
  	/* 0. Validate ruleset, otherwise roll back for error reporting. */
  	if (nf_tables_validate(net) < 0)
  		return -EAGAIN;
  
  	err = nft_flow_rule_offload_commit(net);
  	if (err < 0)
  		return err;
  
  	/* 1.  Allocate space for next generation rules_gen_X[] */
  	list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
  		int ret;
  
  		if (trans->msg_type == NFT_MSG_NEWRULE ||
  		    trans->msg_type == NFT_MSG_DELRULE) {
  			chain = trans->ctx.chain;
  
  			ret = nf_tables_commit_chain_prepare(net, chain);
  			if (ret < 0) {
  				nf_tables_commit_chain_prepare_cancel(net);
  				return ret;
  			}
  		}
  	}
  
  	/* step 2.  Make rules_gen_X visible to packet path */
  	list_for_each_entry(table, &net->nft.tables, list) {
  		list_for_each_entry(chain, &table->chains, list)
  			nf_tables_commit_chain(net, chain);
  	}
  
  	/*
  	 * Bump generation counter, invalidate any dump in progress.
  	 * Cannot fail after this point.
  	 */
  	while (++net->nft.base_seq == 0);
  
  	/* step 3. Start new generation, rules_gen_X now in use. */
  	net->nft.gencursor = nft_gencursor_next(net);
  
  	list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
  		switch (trans->msg_type) {
  		case NFT_MSG_NEWTABLE:
  			if (nft_trans_table_update(trans)) {
  				if (!nft_trans_table_enable(trans)) {
  					nf_tables_table_disable(net,
  								trans->ctx.table);
  					trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
  				}
  			} else {
  				nft_clear(net, trans->ctx.table);
  			}
  			nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
  			nft_trans_destroy(trans);
  			break;
  		case NFT_MSG_DELTABLE:
  			list_del_rcu(&trans->ctx.table->list);
  			nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
  			break;
  		case NFT_MSG_NEWCHAIN:
  			if (nft_trans_chain_update(trans)) {
  				nft_chain_commit_update(trans);
  				nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
  				/* trans destroyed after rcu grace period */
  			} else {
  				nft_chain_commit_drop_policy(trans);
  				nft_clear(net, trans->ctx.chain);
  				nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
  				nft_trans_destroy(trans);
  			}
  			break;
  		case NFT_MSG_DELCHAIN:
  			nft_chain_del(trans->ctx.chain);
  			nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
  			nf_tables_unregister_hook(trans->ctx.net,
  						  trans->ctx.table,
  						  trans->ctx.chain);
  			break;
  		case NFT_MSG_NEWRULE:
  			nft_clear(trans->ctx.net, nft_trans_rule(trans));
  			nf_tables_rule_notify(&trans->ctx,
  					      nft_trans_rule(trans),
  					      NFT_MSG_NEWRULE);
  			nft_trans_destroy(trans);
  			break;
  		case NFT_MSG_DELRULE:
  			list_del_rcu(&nft_trans_rule(trans)->list);
  			nf_tables_rule_notify(&trans->ctx,
  					      nft_trans_rule(trans),
  					      NFT_MSG_DELRULE);
  			nft_rule_expr_deactivate(&trans->ctx,
  						 nft_trans_rule(trans),
  						 NFT_TRANS_COMMIT);
  			break;
  		case NFT_MSG_NEWSET:
  			nft_clear(net, nft_trans_set(trans));
  			/* This avoids hitting -EBUSY when deleting the table
  			 * from the transaction.
  			 */
  			if (nft_set_is_anonymous(nft_trans_set(trans)) &&
  			    !list_empty(&nft_trans_set(trans)->bindings))
  				trans->ctx.table->use--;
  
  			nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
  					     NFT_MSG_NEWSET, GFP_KERNEL);
  			nft_trans_destroy(trans);
  			break;
  		case NFT_MSG_DELSET:
  			list_del_rcu(&nft_trans_set(trans)->list);
  			nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
  					     NFT_MSG_DELSET, GFP_KERNEL);
  			break;
  		case NFT_MSG_NEWSETELEM:
  			te = (struct nft_trans_elem *)trans->data;
  
  			te->set->ops->activate(net, te->set, &te->elem);
  			nf_tables_setelem_notify(&trans->ctx, te->set,
  						 &te->elem,
  						 NFT_MSG_NEWSETELEM, 0);
  			nft_trans_destroy(trans);
  			break;
  		case NFT_MSG_DELSETELEM:
  			te = (struct nft_trans_elem *)trans->data;
  
  			nf_tables_setelem_notify(&trans->ctx, te->set,
  						 &te->elem,
  						 NFT_MSG_DELSETELEM, 0);
  			te->set->ops->remove(net, te->set, &te->elem);
  			atomic_dec(&te->set->nelems);
  			te->set->ndeact--;
  			break;
  		case NFT_MSG_NEWOBJ:
  			if (nft_trans_obj_update(trans)) {
  				nft_obj_commit_update(trans);
  				nf_tables_obj_notify(&trans->ctx,
  						     nft_trans_obj(trans),
  						     NFT_MSG_NEWOBJ);
  			} else {
  				nft_clear(net, nft_trans_obj(trans));
  				nf_tables_obj_notify(&trans->ctx,
  						     nft_trans_obj(trans),
  						     NFT_MSG_NEWOBJ);
  				nft_trans_destroy(trans);
  			}
  			break;
  		case NFT_MSG_DELOBJ:
  			nft_obj_del(nft_trans_obj(trans));
  			nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
  					     NFT_MSG_DELOBJ);
  			break;
  		case NFT_MSG_NEWFLOWTABLE:
  			if (nft_trans_flowtable_update(trans)) {
  				nft_trans_flowtable(trans)->data.flags =
  					nft_trans_flowtable_flags(trans);
  				nf_tables_flowtable_notify(&trans->ctx,
  							   nft_trans_flowtable(trans),
  							   &nft_trans_flowtable_hooks(trans),
  							   NFT_MSG_NEWFLOWTABLE);
  				list_splice(&nft_trans_flowtable_hooks(trans),
  					    &nft_trans_flowtable(trans)->hook_list);
  			} else {
  				nft_clear(net, nft_trans_flowtable(trans));
  				nf_tables_flowtable_notify(&trans->ctx,
  							   nft_trans_flowtable(trans),
  							   &nft_trans_flowtable(trans)->hook_list,
  							   NFT_MSG_NEWFLOWTABLE);
  			}
  			nft_trans_destroy(trans);
  			break;
  		case NFT_MSG_DELFLOWTABLE:
  			if (nft_trans_flowtable_update(trans)) {
  				nft_flowtable_hooks_del(nft_trans_flowtable(trans),
  							&nft_trans_flowtable_hooks(trans));
  				nf_tables_flowtable_notify(&trans->ctx,
  							   nft_trans_flowtable(trans),
  							   &nft_trans_flowtable_hooks(trans),
  							   NFT_MSG_DELFLOWTABLE);
  				nft_unregister_flowtable_net_hooks(net,
  								   &nft_trans_flowtable_hooks(trans));
  			} else {
  				list_del_rcu(&nft_trans_flowtable(trans)->list);
  				nf_tables_flowtable_notify(&trans->ctx,
  							   nft_trans_flowtable(trans),
  							   &nft_trans_flowtable(trans)->hook_list,
  							   NFT_MSG_DELFLOWTABLE);
  				nft_unregister_flowtable_net_hooks(net,
  						&nft_trans_flowtable(trans)->hook_list);
  			}
  			break;
  		}
  	}
  
  	nft_commit_notify(net, NETLINK_CB(skb).portid);
  	nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
  	nf_tables_commit_release(net);
  
  	return 0;
  }
  
  static void nf_tables_module_autoload(struct net *net)
  {
  	struct nft_module_request *req, *next;
  	LIST_HEAD(module_list);
  
  	list_splice_init(&net->nft.module_list, &module_list);
  	mutex_unlock(&net->nft.commit_mutex);
  	list_for_each_entry_safe(req, next, &module_list, list) {
  		request_module("%s", req->module);
  		req->done = true;
  	}
  	mutex_lock(&net->nft.commit_mutex);
  	list_splice(&module_list, &net->nft.module_list);
  }
  
  static void nf_tables_abort_release(struct nft_trans *trans)
  {
  	switch (trans->msg_type) {
  	case NFT_MSG_NEWTABLE:
  		nf_tables_table_destroy(&trans->ctx);
  		break;
  	case NFT_MSG_NEWCHAIN:
  		nf_tables_chain_destroy(&trans->ctx);
  		break;
  	case NFT_MSG_NEWRULE:
  		nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
  		break;
  	case NFT_MSG_NEWSET:
  		nft_set_destroy(&trans->ctx, nft_trans_set(trans));
  		break;
  	case NFT_MSG_NEWSETELEM:
  		nft_set_elem_destroy(nft_trans_elem_set(trans),
  				     nft_trans_elem(trans).priv, true);
  		break;
  	case NFT_MSG_NEWOBJ:
  		nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
  		break;
  	case NFT_MSG_NEWFLOWTABLE:
  		if (nft_trans_flowtable_update(trans))
  			nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
  		else
  			nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
  		break;
  	}
  	kfree(trans);
  }
  
  static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
  {
  	struct nft_trans *trans, *next;
  	struct nft_trans_elem *te;
  	struct nft_hook *hook;
  
  	if (action == NFNL_ABORT_VALIDATE &&
  	    nf_tables_validate(net) < 0)
  		return -EAGAIN;
  
  	list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
  					 list) {
  		switch (trans->msg_type) {
  		case NFT_MSG_NEWTABLE:
  			if (nft_trans_table_update(trans)) {
  				if (nft_trans_table_enable(trans)) {
  					nf_tables_table_disable(net,
  								trans->ctx.table);
  					trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
  				}
  				nft_trans_destroy(trans);
  			} else {
  				list_del_rcu(&trans->ctx.table->list);
  			}
  			break;
  		case NFT_MSG_DELTABLE:
  			nft_clear(trans->ctx.net, trans->ctx.table);
  			nft_trans_destroy(trans);
  			break;
  		case NFT_MSG_NEWCHAIN:
  			if (nft_trans_chain_update(trans)) {
  				free_percpu(nft_trans_chain_stats(trans));
  				kfree(nft_trans_chain_name(trans));
  				nft_trans_destroy(trans);
  			} else {
  				if (nft_chain_is_bound(trans->ctx.chain)) {
  					nft_trans_destroy(trans);
  					break;
  				}
  				trans->ctx.table->use--;
  				nft_chain_del(trans->ctx.chain);
  				nf_tables_unregister_hook(trans->ctx.net,
  							  trans->ctx.table,
  							  trans->ctx.chain);
  			}
  			break;
  		case NFT_MSG_DELCHAIN:
  			trans->ctx.table->use++;
  			nft_clear(trans->ctx.net, trans->ctx.chain);
  			nft_trans_destroy(trans);
  			break;
  		case NFT_MSG_NEWRULE:
  			trans->ctx.chain->use--;
  			list_del_rcu(&nft_trans_rule(trans)->list);
  			nft_rule_expr_deactivate(&trans->ctx,
  						 nft_trans_rule(trans),
  						 NFT_TRANS_ABORT);
  			break;
  		case NFT_MSG_DELRULE:
  			trans->ctx.chain->use++;
  			nft_clear(trans->ctx.net, nft_trans_rule(trans));
  			nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
  			nft_trans_destroy(trans);
  			break;
  		case NFT_MSG_NEWSET:
  			trans->ctx.table->use--;
  			if (nft_trans_set_bound(trans)) {
  				nft_trans_destroy(trans);
  				break;
  			}
  			list_del_rcu(&nft_trans_set(trans)->list);
  			break;
  		case NFT_MSG_DELSET:
  			trans->ctx.table->use++;
  			nft_clear(trans->ctx.net, nft_trans_set(trans));
  			nft_trans_destroy(trans);
  			break;
  		case NFT_MSG_NEWSETELEM:
  			if (nft_trans_elem_set_bound(trans)) {
  				nft_trans_destroy(trans);
  				break;
  			}
  			te = (struct nft_trans_elem *)trans->data;
  			te->set->ops->remove(net, te->set, &te->elem);
  			atomic_dec(&te->set->nelems);
  			break;
  		case NFT_MSG_DELSETELEM:
  			te = (struct nft_trans_elem *)trans->data;
  
  			nft_set_elem_activate(net, te->set, &te->elem);
  			te->set->ops->activate(net, te->set, &te->elem);
  			te->set->ndeact--;
  
  			nft_trans_destroy(trans);
  			break;
  		case NFT_MSG_NEWOBJ:
  			if (nft_trans_obj_update(trans)) {
  				kfree(nft_trans_obj_newobj(trans));
  				nft_trans_destroy(trans);
  			} else {
  				trans->ctx.table->use--;
  				nft_obj_del(nft_trans_obj(trans));
  			}
  			break;
  		case NFT_MSG_DELOBJ:
  			trans->ctx.table->use++;
  			nft_clear(trans->ctx.net, nft_trans_obj(trans));
  			nft_trans_destroy(trans);
  			break;
  		case NFT_MSG_NEWFLOWTABLE:
  			if (nft_trans_flowtable_update(trans)) {
  				nft_unregister_flowtable_net_hooks(net,
  						&nft_trans_flowtable_hooks(trans));
  			} else {
  				trans->ctx.table->use--;
  				list_del_rcu(&nft_trans_flowtable(trans)->list);
  				nft_unregister_flowtable_net_hooks(net,
  						&nft_trans_flowtable(trans)->hook_list);
  			}
  			break;
  		case NFT_MSG_DELFLOWTABLE:
  			if (nft_trans_flowtable_update(trans)) {
  				list_for_each_entry(hook, &nft_trans_flowtable(trans)->hook_list, list)
  					hook->inactive = false;
  			} else {
  				trans->ctx.table->use++;
  				nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
  			}
  			nft_trans_destroy(trans);
  			break;
  		}
  	}
  
  	synchronize_rcu();
  
  	list_for_each_entry_safe_reverse(trans, next,
  					 &net->nft.commit_list, list) {
  		list_del(&trans->list);
  		nf_tables_abort_release(trans);
  	}
  
  	if (action == NFNL_ABORT_AUTOLOAD)
  		nf_tables_module_autoload(net);
  	else
  		nf_tables_module_autoload_cleanup(net);
  
  	return 0;
  }
  
  static void nf_tables_cleanup(struct net *net)
  {
  	nft_validate_state_update(net, NFT_VALIDATE_SKIP);
  }
  
  static int nf_tables_abort(struct net *net, struct sk_buff *skb,
  			   enum nfnl_abort_action action)
  {
  	int ret = __nf_tables_abort(net, action);
  
  	mutex_unlock(&net->nft.commit_mutex);
  
  	return ret;
  }
  
  static bool nf_tables_valid_genid(struct net *net, u32 genid)
  {
  	bool genid_ok;
  
  	mutex_lock(&net->nft.commit_mutex);
  
  	genid_ok = genid == 0 || net->nft.base_seq == genid;
  	if (!genid_ok)
  		mutex_unlock(&net->nft.commit_mutex);
  
  	/* else, commit mutex has to be released by commit or abort function */
  	return genid_ok;
  }
  
  static const struct nfnetlink_subsystem nf_tables_subsys = {
  	.name		= "nf_tables",
  	.subsys_id	= NFNL_SUBSYS_NFTABLES,
  	.cb_count	= NFT_MSG_MAX,
  	.cb		= nf_tables_cb,
  	.commit		= nf_tables_commit,
  	.abort		= nf_tables_abort,
  	.cleanup	= nf_tables_cleanup,
  	.valid_genid	= nf_tables_valid_genid,
  	.owner		= THIS_MODULE,
  };
  
  int nft_chain_validate_dependency(const struct nft_chain *chain,
  				  enum nft_chain_types type)
  {
  	const struct nft_base_chain *basechain;
  
  	if (nft_is_base_chain(chain)) {
  		basechain = nft_base_chain(chain);
  		if (basechain->type->type != type)
  			return -EOPNOTSUPP;
  	}
  	return 0;
  }
  EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
  
  int nft_chain_validate_hooks(const struct nft_chain *chain,
  			     unsigned int hook_flags)
  {
  	struct nft_base_chain *basechain;
  
  	if (nft_is_base_chain(chain)) {
  		basechain = nft_base_chain(chain);
  
  		if ((1 << basechain->ops.hooknum) & hook_flags)
  			return 0;
  
  		return -EOPNOTSUPP;
  	}
  
  	return 0;
  }
  EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
  
  /*
   * Loop detection - walk through the ruleset beginning at the destination chain
   * of a new jump until either the source chain is reached (loop) or all
   * reachable chains have been traversed.
   *
   * The loop check is performed whenever a new jump verdict is added to an
   * expression or verdict map or a verdict map is bound to a new chain.
   */
  
  static int nf_tables_check_loops(const struct nft_ctx *ctx,
  				 const struct nft_chain *chain);
  
  static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
  					struct nft_set *set,
  					const struct nft_set_iter *iter,
  					struct nft_set_elem *elem)
  {
  	const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
  	const struct nft_data *data;
  
  	if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
  	    *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
  		return 0;
  
  	data = nft_set_ext_data(ext);
  	switch (data->verdict.code) {
  	case NFT_JUMP:
  	case NFT_GOTO:
  		return nf_tables_check_loops(ctx, data->verdict.chain);
  	default:
  		return 0;
  	}
  }
  
  static int nf_tables_check_loops(const struct nft_ctx *ctx,
  				 const struct nft_chain *chain)
  {
  	const struct nft_rule *rule;
  	const struct nft_expr *expr, *last;
  	struct nft_set *set;
  	struct nft_set_binding *binding;
  	struct nft_set_iter iter;
  
  	if (ctx->chain == chain)
  		return -ELOOP;
  
  	list_for_each_entry(rule, &chain->rules, list) {
  		nft_rule_for_each_expr(expr, last, rule) {
  			struct nft_immediate_expr *priv;
  			const struct nft_data *data;
  			int err;
  
  			if (strcmp(expr->ops->type->name, "immediate"))
  				continue;
  
  			priv = nft_expr_priv(expr);
  			if (priv->dreg != NFT_REG_VERDICT)
  				continue;
  
  			data = &priv->data;
  			switch (data->verdict.code) {
  			case NFT_JUMP:
  			case NFT_GOTO:
  				err = nf_tables_check_loops(ctx,
  							data->verdict.chain);
  				if (err < 0)
  					return err;
  				break;
  			default:
  				break;
  			}
  		}
  	}
  
  	list_for_each_entry(set, &ctx->table->sets, list) {
  		if (!nft_is_active_next(ctx->net, set))
  			continue;
  		if (!(set->flags & NFT_SET_MAP) ||
  		    set->dtype != NFT_DATA_VERDICT)
  			continue;
  
  		list_for_each_entry(binding, &set->bindings, list) {
  			if (!(binding->flags & NFT_SET_MAP) ||
  			    binding->chain != chain)
  				continue;
  
  			iter.genmask	= nft_genmask_next(ctx->net);
  			iter.skip 	= 0;
  			iter.count	= 0;
  			iter.err	= 0;
  			iter.fn		= nf_tables_loop_check_setelem;
  
  			set->ops->walk(ctx, set, &iter);
  			if (iter.err < 0)
  				return iter.err;
  		}
  	}
  
  	return 0;
  }
  
  /**
   *	nft_parse_u32_check - fetch u32 attribute and check for maximum value
   *
   *	@attr: netlink attribute to fetch value from
   *	@max: maximum value to be stored in dest
   *	@dest: pointer to the variable
   *
   *	Parse, check and store a given u32 netlink attribute into variable.
   *	This function returns -ERANGE if the value goes over maximum value.
   *	Otherwise a 0 is returned and the attribute value is stored in the
   *	destination variable.
   */
  int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
  {
  	u32 val;
  
  	val = ntohl(nla_get_be32(attr));
  	if (val > max)
  		return -ERANGE;
  
  	*dest = val;
  	return 0;
  }
  EXPORT_SYMBOL_GPL(nft_parse_u32_check);
  
  /**
   *	nft_parse_register - parse a register value from a netlink attribute
   *
   *	@attr: netlink attribute
   *
   *	Parse and translate a register value from a netlink attribute.
   *	Registers used to be 128 bit wide, these register numbers will be
   *	mapped to the corresponding 32 bit register numbers.
   */
  unsigned int nft_parse_register(const struct nlattr *attr)
  {
  	unsigned int reg;
  
  	reg = ntohl(nla_get_be32(attr));
  	switch (reg) {
  	case NFT_REG_VERDICT...NFT_REG_4:
  		return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
  	default:
  		return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
  	}
  }
  EXPORT_SYMBOL_GPL(nft_parse_register);
  
  /**
   *	nft_dump_register - dump a register value to a netlink attribute
   *
   *	@skb: socket buffer
   *	@attr: attribute number
   *	@reg: register number
   *
   *	Construct a netlink attribute containing the register number. For
   *	compatibility reasons, register numbers being a multiple of 4 are
   *	translated to the corresponding 128 bit register numbers.
   */
  int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
  {
  	if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
  		reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
  	else
  		reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
  
  	return nla_put_be32(skb, attr, htonl(reg));
  }
  EXPORT_SYMBOL_GPL(nft_dump_register);
  
  /**
   *	nft_validate_register_load - validate a load from a register
   *
   *	@reg: the register number
   *	@len: the length of the data
   *
   * 	Validate that the input register is one of the general purpose
   * 	registers and that the length of the load is within the bounds.
   */
  int nft_validate_register_load(enum nft_registers reg, unsigned int len)
  {
  	if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
  		return -EINVAL;
  	if (len == 0)
  		return -EINVAL;
  	if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
  		return -ERANGE;
  
  	return 0;
  }
  EXPORT_SYMBOL_GPL(nft_validate_register_load);
  
  /**
   *	nft_validate_register_store - validate an expressions' register store
   *
   *	@ctx: context of the expression performing the load
   * 	@reg: the destination register number
   * 	@data: the data to load
   * 	@type: the data type
   * 	@len: the length of the data
   *
   * 	Validate that a data load uses the appropriate data type for
   * 	the destination register and the length is within the bounds.
   * 	A value of NULL for the data means that its runtime gathered
   * 	data.
   */
  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)
  {
  	int err;
  
  	switch (reg) {
  	case NFT_REG_VERDICT:
  		if (type != NFT_DATA_VERDICT)
  			return -EINVAL;
  
  		if (data != NULL &&
  		    (data->verdict.code == NFT_GOTO ||
  		     data->verdict.code == NFT_JUMP)) {
  			err = nf_tables_check_loops(ctx, data->verdict.chain);
  			if (err < 0)
  				return err;
  		}
  
  		return 0;
  	default:
  		if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
  			return -EINVAL;
  		if (len == 0)
  			return -EINVAL;
  		if (reg * NFT_REG32_SIZE + len >
  		    sizeof_field(struct nft_regs, data))
  			return -ERANGE;
  
  		if (data != NULL && type != NFT_DATA_VALUE)
  			return -EINVAL;
  		return 0;
  	}
  }
  EXPORT_SYMBOL_GPL(nft_validate_register_store);
  
  static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
  	[NFTA_VERDICT_CODE]	= { .type = NLA_U32 },
  	[NFTA_VERDICT_CHAIN]	= { .type = NLA_STRING,
  				    .len = NFT_CHAIN_MAXNAMELEN - 1 },
  	[NFTA_VERDICT_CHAIN_ID]	= { .type = NLA_U32 },
  };
  
  static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
  			    struct nft_data_desc *desc, const struct nlattr *nla)
  {
  	u8 genmask = nft_genmask_next(ctx->net);
  	struct nlattr *tb[NFTA_VERDICT_MAX + 1];
  	struct nft_chain *chain;
  	int err;
  
  	err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
  					  nft_verdict_policy, NULL);
  	if (err < 0)
  		return err;
  
  	if (!tb[NFTA_VERDICT_CODE])
  		return -EINVAL;
  	data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
  
  	switch (data->verdict.code) {
  	default:
  		switch (data->verdict.code & NF_VERDICT_MASK) {
  		case NF_ACCEPT:
  		case NF_DROP:
  		case NF_QUEUE:
  			break;
  		default:
  			return -EINVAL;
  		}
  		fallthrough;
  	case NFT_CONTINUE:
  	case NFT_BREAK:
  	case NFT_RETURN:
  		break;
  	case NFT_JUMP:
  	case NFT_GOTO:
  		if (tb[NFTA_VERDICT_CHAIN]) {
  			chain = nft_chain_lookup(ctx->net, ctx->table,
  						 tb[NFTA_VERDICT_CHAIN],
  						 genmask);
  		} else if (tb[NFTA_VERDICT_CHAIN_ID]) {
  			chain = nft_chain_lookup_byid(ctx->net,
  						      tb[NFTA_VERDICT_CHAIN_ID]);
  			if (IS_ERR(chain))
  				return PTR_ERR(chain);
  		} else {
  			return -EINVAL;
  		}
  
  		if (IS_ERR(chain))
  			return PTR_ERR(chain);
  		if (nft_is_base_chain(chain))
  			return -EOPNOTSUPP;
  
  		chain->use++;
  		data->verdict.chain = chain;
  		break;
  	}
  
  	desc->len = sizeof(data->verdict);
  	desc->type = NFT_DATA_VERDICT;
  	return 0;
  }
  
  static void nft_verdict_uninit(const struct nft_data *data)
  {
  	struct nft_chain *chain;
  	struct nft_rule *rule;
  
  	switch (data->verdict.code) {
  	case NFT_JUMP:
  	case NFT_GOTO:
  		chain = data->verdict.chain;
  		chain->use--;
  
  		if (!nft_chain_is_bound(chain))
  			break;
  
  		chain->table->use--;
  		list_for_each_entry(rule, &chain->rules, list)
  			chain->use--;
  
  		nft_chain_del(chain);
  		break;
  	}
  }
  
  int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
  {
  	struct nlattr *nest;
  
  	nest = nla_nest_start_noflag(skb, type);
  	if (!nest)
  		goto nla_put_failure;
  
  	if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
  		goto nla_put_failure;
  
  	switch (v->code) {
  	case NFT_JUMP:
  	case NFT_GOTO:
  		if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
  				   v->chain->name))
  			goto nla_put_failure;
  	}
  	nla_nest_end(skb, nest);
  	return 0;
  
  nla_put_failure:
  	return -1;
  }
  
  static int nft_value_init(const struct nft_ctx *ctx,
  			  struct nft_data *data, unsigned int size,
  			  struct nft_data_desc *desc, const struct nlattr *nla)
  {
  	unsigned int len;
  
  	len = nla_len(nla);
  	if (len == 0)
  		return -EINVAL;
  	if (len > size)
  		return -EOVERFLOW;
  
  	nla_memcpy(data->data, nla, len);
  	desc->type = NFT_DATA_VALUE;
  	desc->len  = len;
  	return 0;
  }
  
  static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
  			  unsigned int len)
  {
  	return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
  }
  
  static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
  	[NFTA_DATA_VALUE]	= { .type = NLA_BINARY },
  	[NFTA_DATA_VERDICT]	= { .type = NLA_NESTED },
  };
  
  /**
   *	nft_data_init - parse nf_tables data netlink attributes
   *
   *	@ctx: context of the expression using the data
   *	@data: destination struct nft_data
   *	@size: maximum data length
   *	@desc: data description
   *	@nla: netlink attribute containing data
   *
   *	Parse the netlink data attributes and initialize a struct nft_data.
   *	The type and length of data are returned in the data description.
   *
   *	The caller can indicate that it only wants to accept data of type
   *	NFT_DATA_VALUE by passing NULL for the ctx argument.
   */
  int nft_data_init(const struct nft_ctx *ctx,
  		  struct nft_data *data, unsigned int size,
  		  struct nft_data_desc *desc, const struct nlattr *nla)
  {
  	struct nlattr *tb[NFTA_DATA_MAX + 1];
  	int err;
  
  	err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
  					  nft_data_policy, NULL);
  	if (err < 0)
  		return err;
  
  	if (tb[NFTA_DATA_VALUE])
  		return nft_value_init(ctx, data, size, desc,
  				      tb[NFTA_DATA_VALUE]);
  	if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
  		return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
  	return -EINVAL;
  }
  EXPORT_SYMBOL_GPL(nft_data_init);
  
  /**
   *	nft_data_release - release a nft_data item
   *
   *	@data: struct nft_data to release
   *	@type: type of data
   *
   *	Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
   *	all others need to be released by calling this function.
   */
  void nft_data_release(const struct nft_data *data, enum nft_data_types type)
  {
  	if (type < NFT_DATA_VERDICT)
  		return;
  	switch (type) {
  	case NFT_DATA_VERDICT:
  		return nft_verdict_uninit(data);
  	default:
  		WARN_ON(1);
  	}
  }
  EXPORT_SYMBOL_GPL(nft_data_release);
  
  int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
  		  enum nft_data_types type, unsigned int len)
  {
  	struct nlattr *nest;
  	int err;
  
  	nest = nla_nest_start_noflag(skb, attr);
  	if (nest == NULL)
  		return -1;
  
  	switch (type) {
  	case NFT_DATA_VALUE:
  		err = nft_value_dump(skb, data, len);
  		break;
  	case NFT_DATA_VERDICT:
  		err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
  		break;
  	default:
  		err = -EINVAL;
  		WARN_ON(1);
  	}
  
  	nla_nest_end(skb, nest);
  	return err;
  }
  EXPORT_SYMBOL_GPL(nft_data_dump);
  
  int __nft_release_basechain(struct nft_ctx *ctx)
  {
  	struct nft_rule *rule, *nr;
  
  	if (WARN_ON(!nft_is_base_chain(ctx->chain)))
  		return 0;
  
  	nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
  	list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
  		list_del(&rule->list);
  		ctx->chain->use--;
  		nf_tables_rule_release(ctx, rule);
  	}
  	nft_chain_del(ctx->chain);
  	ctx->table->use--;
  	nf_tables_chain_destroy(ctx);
  
  	return 0;
  }
  EXPORT_SYMBOL_GPL(__nft_release_basechain);
  
  static void __nft_release_hooks(struct net *net)
  {
  	struct nft_table *table;
  	struct nft_chain *chain;
  
  	list_for_each_entry(table, &net->nft.tables, list) {
  		list_for_each_entry(chain, &table->chains, list)
  			nf_tables_unregister_hook(net, table, chain);
  	}
  }
  
  static void __nft_release_tables(struct net *net)
  {
  	struct nft_flowtable *flowtable, *nf;
  	struct nft_table *table, *nt;
  	struct nft_chain *chain, *nc;
  	struct nft_object *obj, *ne;
  	struct nft_rule *rule, *nr;
  	struct nft_set *set, *ns;
  	struct nft_ctx ctx = {
  		.net	= net,
  		.family	= NFPROTO_NETDEV,
  	};
  
  	list_for_each_entry_safe(table, nt, &net->nft.tables, list) {
  		ctx.family = table->family;
  		ctx.table = table;
  		list_for_each_entry(chain, &table->chains, list) {
  			ctx.chain = chain;
  			list_for_each_entry_safe(rule, nr, &chain->rules, list) {
  				list_del(&rule->list);
  				chain->use--;
  				nf_tables_rule_release(&ctx, rule);
  			}
  		}
  		list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
  			list_del(&flowtable->list);
  			table->use--;
  			nf_tables_flowtable_destroy(flowtable);
  		}
  		list_for_each_entry_safe(set, ns, &table->sets, list) {
  			list_del(&set->list);
  			table->use--;
  			nft_set_destroy(&ctx, set);
  		}
  		list_for_each_entry_safe(obj, ne, &table->objects, list) {
  			nft_obj_del(obj);
  			table->use--;
  			nft_obj_destroy(&ctx, obj);
  		}
  		list_for_each_entry_safe(chain, nc, &table->chains, list) {
  			ctx.chain = chain;
  			nft_chain_del(chain);
  			table->use--;
  			nf_tables_chain_destroy(&ctx);
  		}
  		list_del(&table->list);
  		nf_tables_table_destroy(&ctx);
  	}
  }
  
  static int __net_init nf_tables_init_net(struct net *net)
  {
  	INIT_LIST_HEAD(&net->nft.tables);
  	INIT_LIST_HEAD(&net->nft.commit_list);
  	INIT_LIST_HEAD(&net->nft.module_list);
  	INIT_LIST_HEAD(&net->nft.notify_list);
  	mutex_init(&net->nft.commit_mutex);
  	net->nft.base_seq = 1;
  	net->nft.validate_state = NFT_VALIDATE_SKIP;
  
  	return 0;
  }
  
  static void __net_exit nf_tables_pre_exit_net(struct net *net)
  {
  	__nft_release_hooks(net);
  }
  
  static void __net_exit nf_tables_exit_net(struct net *net)
  {
  	mutex_lock(&net->nft.commit_mutex);
  	if (!list_empty(&net->nft.commit_list))
  		__nf_tables_abort(net, NFNL_ABORT_NONE);
  	__nft_release_tables(net);
  	mutex_unlock(&net->nft.commit_mutex);
  	WARN_ON_ONCE(!list_empty(&net->nft.tables));
  	WARN_ON_ONCE(!list_empty(&net->nft.module_list));
  	WARN_ON_ONCE(!list_empty(&net->nft.notify_list));
  }
  
  static struct pernet_operations nf_tables_net_ops = {
  	.init		= nf_tables_init_net,
  	.pre_exit	= nf_tables_pre_exit_net,
  	.exit		= nf_tables_exit_net,
  };
  
  static int __init nf_tables_module_init(void)
  {
  	int err;
  
  	spin_lock_init(&nf_tables_destroy_list_lock);
  	err = register_pernet_subsys(&nf_tables_net_ops);
  	if (err < 0)
  		return err;
  
  	err = nft_chain_filter_init();
  	if (err < 0)
  		goto err1;
  
  	err = nf_tables_core_module_init();
  	if (err < 0)
  		goto err2;
  
  	err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
  	if (err < 0)
  		goto err3;
  
  	err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
  	if (err < 0)
  		goto err4;
  
  	err = nft_offload_init();
  	if (err < 0)
  		goto err5;
  
  	/* must be last */
  	err = nfnetlink_subsys_register(&nf_tables_subsys);
  	if (err < 0)
  		goto err6;
  
  	nft_chain_route_init();
  
  	return err;
  err6:
  	nft_offload_exit();
  err5:
  	rhltable_destroy(&nft_objname_ht);
  err4:
  	unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
  err3:
  	nf_tables_core_module_exit();
  err2:
  	nft_chain_filter_fini();
  err1:
  	unregister_pernet_subsys(&nf_tables_net_ops);
  	return err;
  }
  
  static void __exit nf_tables_module_exit(void)
  {
  	nfnetlink_subsys_unregister(&nf_tables_subsys);
  	nft_offload_exit();
  	unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
  	nft_chain_filter_fini();
  	nft_chain_route_fini();
  	unregister_pernet_subsys(&nf_tables_net_ops);
  	cancel_work_sync(&trans_destroy_work);
  	rcu_barrier();
  	rhltable_destroy(&nft_objname_ht);
  	nf_tables_core_module_exit();
  }
  
  module_init(nf_tables_module_init);
  module_exit(nf_tables_module_exit);
  
  MODULE_LICENSE("GPL");
  MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
  MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);
  