netfilter: nf_tables: memcg accounting for dynamically allocated objects

nft_*.c files whose NFT_EXPR_STATEFUL flag is set on need to
use __GFP_ACCOUNT flag for objects that are dynamically
allocated from the packet path.

Such objects are allocated inside nft_expr_ops->init() callbacks
executed in task context while processing netlink messages.

In addition, this patch adds accounting to nft_set_elem_expr_clone()
used for the same purposes.
Signed-off-by: Vasily Averin <vvs@openvz.org>
Acked-by: Roman Gushchin <roman.gushchin@linux.dev>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

net/netfilter/nf_tables_api.c

@@ -5526,7 +5526,7 @@ int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
 	int err, i, k;
 
 	for (i = 0; i < set->num_exprs; i++) {
-		expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL);
+		expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL_ACCOUNT);
 		if (!expr)
 			goto err_expr;
 

net/netfilter/nft_connlimit.c

@@ -77,7 +77,7 @@ static int nft_connlimit_do_init(const struct nft_ctx *ctx,
 			invert = true;
 	}
 
-	priv->list = kmalloc(sizeof(*priv->list), GFP_KERNEL);
+	priv->list = kmalloc(sizeof(*priv->list), GFP_KERNEL_ACCOUNT);
 	if (!priv->list)
 		return -ENOMEM;
 

net/netfilter/nft_counter.c

@@ -62,7 +62,7 @@ static int nft_counter_do_init(const struct nlattr * const tb[],
 	struct nft_counter __percpu *cpu_stats;
 	struct nft_counter *this_cpu;
 
-	cpu_stats = alloc_percpu(struct nft_counter);
+	cpu_stats = alloc_percpu_gfp(struct nft_counter, GFP_KERNEL_ACCOUNT);
 	if (cpu_stats == NULL)
 		return -ENOMEM;
 

net/netfilter/nft_last.c

@@ -30,7 +30,7 @@ static int nft_last_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
 	u64 last_jiffies;
 	int err;
 
-	last = kzalloc(sizeof(*last), GFP_KERNEL);
+	last = kzalloc(sizeof(*last), GFP_KERNEL_ACCOUNT);
 	if (!last)
 		return -ENOMEM;
 

net/netfilter/nft_limit.c

@@ -90,7 +90,7 @@ static int nft_limit_init(struct nft_limit_priv *priv,
 				 priv->rate);
 	}
 
-	priv->limit = kmalloc(sizeof(*priv->limit), GFP_KERNEL);
+	priv->limit = kmalloc(sizeof(*priv->limit), GFP_KERNEL_ACCOUNT);
 	if (!priv->limit)
 		return -ENOMEM;
 

net/netfilter/nft_quota.c

@@ -90,7 +90,7 @@ static int nft_quota_do_init(const struct nlattr * const tb[],
 			return -EOPNOTSUPP;
 	}
 
-	priv->consumed = kmalloc(sizeof(*priv->consumed), GFP_KERNEL);
+	priv->consumed = kmalloc(sizeof(*priv->consumed), GFP_KERNEL_ACCOUNT);
 	if (!priv->consumed)
 		return -ENOMEM;