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Commit 173705d9 authored by Pablo Neira Ayuso's avatar Pablo Neira Ayuso
Browse files

netfilter: nft_quota: add stateful object type 



Register a new quota stateful object type into the new stateful object
infrastructure.

Signed-off-by: default avatarPablo Neira Ayuso <pablo@netfilter.org>
parent b1ce0ced

include/uapi/linux/netfilter/nf_tables.h

+1 −0
Original line number Diff line number Diff line
@@ -1187,6 +1187,7 @@ enum nft_fib_flags { 


#define NFT_OBJECT_UNSPEC	0

#define NFT_OBJECT_COUNTER	1

#define NFT_OBJECT_QUOTA	2



/**

 * enum nft_object_attributes - nf_tables stateful object netlink attributes

net/netfilter/nft_quota.c

+83 −13
Original line number Diff line number Diff line
@@ -27,12 +27,10 @@ static inline bool nft_overquota(struct nft_quota *priv, 
	return atomic64_sub_return(pkt->skb->len, &priv->remain) < 0;

}



static void nft_quota_eval(const struct nft_expr *expr,

static inline void nft_quota_do_eval(struct nft_quota *priv,

				     struct nft_regs *regs,

				     const struct nft_pktinfo *pkt)

{

	struct nft_quota *priv = nft_expr_priv(expr);



	if (nft_overquota(priv, pkt) ^ priv->invert)

		regs->verdict.code = NFT_BREAK;

}
@@ -42,11 +40,18 @@ static const struct nla_policy nft_quota_policy[NFTA_QUOTA_MAX + 1] = { 
	[NFTA_QUOTA_FLAGS]	= { .type = NLA_U32 },

};



static int nft_quota_init(const struct nft_ctx *ctx,

			  const struct nft_expr *expr,

			  const struct nlattr * const tb[])

static void nft_quota_obj_eval(struct nft_object *obj,

			       struct nft_regs *regs,

			       const struct nft_pktinfo *pkt)

{

	struct nft_quota *priv = nft_obj_data(obj);



	nft_quota_do_eval(priv, regs, pkt);

}



static int nft_quota_do_init(const struct nlattr * const tb[],

			     struct nft_quota *priv)

{

	struct nft_quota *priv = nft_expr_priv(expr);

	u32 flags = 0;

	u64 quota;
@@ -70,9 +75,16 @@ static int nft_quota_init(const struct nft_ctx *ctx, 
	return 0;

}



static int nft_quota_dump(struct sk_buff *skb, const struct nft_expr *expr)

static int nft_quota_obj_init(const struct nlattr * const tb[],

			      struct nft_object *obj)

{

	struct nft_quota *priv = nft_obj_data(obj);



	return nft_quota_do_init(tb, priv);

}



static int nft_quota_do_dump(struct sk_buff *skb, const struct nft_quota *priv)

{

	const struct nft_quota *priv = nft_expr_priv(expr);

	u32 flags = priv->invert ? NFT_QUOTA_F_INV : 0;



	if (nla_put_be64(skb, NFTA_QUOTA_BYTES, cpu_to_be64(priv->quota),
@@ -85,6 +97,49 @@ static int nft_quota_dump(struct sk_buff *skb, const struct nft_expr *expr) 
	return -1;

}



static int nft_quota_obj_dump(struct sk_buff *skb, const struct nft_object *obj)

{

	struct nft_quota *priv = nft_obj_data(obj);



	return nft_quota_do_dump(skb, priv);

}



static struct nft_object_type nft_quota_obj __read_mostly = {

	.type		= NFT_OBJECT_QUOTA,

	.size		= sizeof(struct nft_quota),

	.maxattr	= NFTA_QUOTA_MAX,

	.policy		= nft_quota_policy,

	.init		= nft_quota_obj_init,

	.eval		= nft_quota_obj_eval,

	.dump		= nft_quota_obj_dump,

	.owner		= THIS_MODULE,

};



static void nft_quota_eval(const struct nft_expr *expr,

			   struct nft_regs *regs,

			   const struct nft_pktinfo *pkt)

{

	struct nft_quota *priv = nft_expr_priv(expr);



	nft_quota_do_eval(priv, regs, pkt);

}



static int nft_quota_init(const struct nft_ctx *ctx,

			  const struct nft_expr *expr,

			  const struct nlattr * const tb[])

{

	struct nft_quota *priv = nft_expr_priv(expr);



	return nft_quota_do_init(tb, priv);

}



static int nft_quota_dump(struct sk_buff *skb, const struct nft_expr *expr)

{

	const struct nft_quota *priv = nft_expr_priv(expr);



	return nft_quota_do_dump(skb, priv);

}



static struct nft_expr_type nft_quota_type;

static const struct nft_expr_ops nft_quota_ops = {

	.type		= &nft_quota_type,
@@ -105,12 +160,26 @@ static struct nft_expr_type nft_quota_type __read_mostly = { 


static int __init nft_quota_module_init(void)

{

        return nft_register_expr(&nft_quota_type);

	int err;



	err = nft_register_obj(&nft_quota_obj);

	if (err < 0)

		return err;



	err = nft_register_expr(&nft_quota_type);

	if (err < 0)

		goto err1;



	return 0;

err1:

	nft_unregister_obj(&nft_quota_obj);

	return err;

}



static void __exit nft_quota_module_exit(void)

{

	nft_unregister_expr(&nft_quota_type);

	nft_unregister_obj(&nft_quota_obj);

}



module_init(nft_quota_module_init);
@@ -119,3 +188,4 @@ module_exit(nft_quota_module_exit); 
MODULE_LICENSE("GPL");

MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");

MODULE_ALIAS_NFT_EXPR("quota");

MODULE_ALIAS_NFT_OBJ(NFT_OBJECT_QUOTA);