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Commit a6912055 authored by Pablo M. Bermudo Garay's avatar Pablo M. Bermudo Garay Committed by Pablo Neira Ayuso
Browse files

netfilter: nft_limit: add stateful object type 



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

Signed-off-by: default avatarPablo M. Bermudo Garay <pablombg@gmail.com>
Signed-off-by: default avatarPablo Neira Ayuso <pablo@netfilter.org>
parent 6e323887

include/uapi/linux/netfilter/nf_tables.h

+2 −1
Original line number Diff line number Diff line
@@ -1282,7 +1282,8 @@ enum nft_ct_helper_attributes { 
#define NFT_OBJECT_COUNTER	1

#define NFT_OBJECT_QUOTA	2

#define NFT_OBJECT_CT_HELPER	3

#define __NFT_OBJECT_MAX	4

#define NFT_OBJECT_LIMIT	4

#define __NFT_OBJECT_MAX	5

#define NFT_OBJECT_MAX		(__NFT_OBJECT_MAX - 1)



/**

net/netfilter/nft_limit.c

+121 −1
Original line number Diff line number Diff line
@@ -229,14 +229,133 @@ static struct nft_expr_type nft_limit_type __read_mostly = { 
	.owner		= THIS_MODULE,

};



static void nft_limit_obj_pkts_eval(struct nft_object *obj,

				    struct nft_regs *regs,

				    const struct nft_pktinfo *pkt)

{

	struct nft_limit_pkts *priv = nft_obj_data(obj);



	if (nft_limit_eval(&priv->limit, priv->cost))

		regs->verdict.code = NFT_BREAK;

}



static int nft_limit_obj_pkts_init(const struct nft_ctx *ctx,

				   const struct nlattr * const tb[],

				   struct nft_object *obj)

{

	struct nft_limit_pkts *priv = nft_obj_data(obj);

	int err;



	err = nft_limit_init(&priv->limit, tb);

	if (err < 0)

		return err;



	priv->cost = div64_u64(priv->limit.nsecs, priv->limit.rate);

	return 0;

}



static int nft_limit_obj_pkts_dump(struct sk_buff *skb,

				   struct nft_object *obj,

				   bool reset)

{

	const struct nft_limit_pkts *priv = nft_obj_data(obj);



	return nft_limit_dump(skb, &priv->limit, NFT_LIMIT_PKTS);

}



static struct nft_object_type nft_limit_obj_type;

static const struct nft_object_ops nft_limit_obj_pkts_ops = {

	.type		= &nft_limit_obj_type,

	.size		= NFT_EXPR_SIZE(sizeof(struct nft_limit_pkts)),

	.init		= nft_limit_obj_pkts_init,

	.eval		= nft_limit_obj_pkts_eval,

	.dump		= nft_limit_obj_pkts_dump,

};



static void nft_limit_obj_bytes_eval(struct nft_object *obj,

				     struct nft_regs *regs,

				     const struct nft_pktinfo *pkt)

{

	struct nft_limit *priv = nft_obj_data(obj);

	u64 cost = div64_u64(priv->nsecs * pkt->skb->len, priv->rate);



	if (nft_limit_eval(priv, cost))

		regs->verdict.code = NFT_BREAK;

}



static int nft_limit_obj_bytes_init(const struct nft_ctx *ctx,

				    const struct nlattr * const tb[],

				    struct nft_object *obj)

{

	struct nft_limit *priv = nft_obj_data(obj);



	return nft_limit_init(priv, tb);

}



static int nft_limit_obj_bytes_dump(struct sk_buff *skb,

				    struct nft_object *obj,

				    bool reset)

{

	const struct nft_limit *priv = nft_obj_data(obj);



	return nft_limit_dump(skb, priv, NFT_LIMIT_PKT_BYTES);

}



static struct nft_object_type nft_limit_obj_type;

static const struct nft_object_ops nft_limit_obj_bytes_ops = {

	.type		= &nft_limit_obj_type,

	.size		= sizeof(struct nft_limit),

	.init		= nft_limit_obj_bytes_init,

	.eval		= nft_limit_obj_bytes_eval,

	.dump		= nft_limit_obj_bytes_dump,

};



static const struct nft_object_ops *

nft_limit_obj_select_ops(const struct nft_ctx *ctx,

			 const struct nlattr * const tb[])

{

	if (!tb[NFTA_LIMIT_TYPE])

		return &nft_limit_obj_pkts_ops;



	switch (ntohl(nla_get_be32(tb[NFTA_LIMIT_TYPE]))) {

	case NFT_LIMIT_PKTS:

		return &nft_limit_obj_pkts_ops;

	case NFT_LIMIT_PKT_BYTES:

		return &nft_limit_obj_bytes_ops;

	}

	return ERR_PTR(-EOPNOTSUPP);

}



static struct nft_object_type nft_limit_obj_type __read_mostly = {

	.select_ops	= nft_limit_obj_select_ops,

	.type		= NFT_OBJECT_LIMIT,

	.maxattr	= NFTA_LIMIT_MAX,

	.policy		= nft_limit_policy,

	.owner		= THIS_MODULE,

};



static int __init nft_limit_module_init(void)

{

	return nft_register_expr(&nft_limit_type);

	int err;



	err = nft_register_obj(&nft_limit_obj_type);

	if (err < 0)

		return err;



	err = nft_register_expr(&nft_limit_type);

	if (err < 0)

		goto err1;



	return 0;

err1:

	nft_unregister_obj(&nft_limit_obj_type);

	return err;

}



static void __exit nft_limit_module_exit(void)

{

	nft_unregister_expr(&nft_limit_type);

	nft_unregister_obj(&nft_limit_obj_type);

}



module_init(nft_limit_module_init);
@@ -245,3 +364,4 @@ module_exit(nft_limit_module_exit); 
MODULE_LICENSE("GPL");

MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");

MODULE_ALIAS_NFT_EXPR("limit");

MODULE_ALIAS_NFT_OBJ(NFT_OBJECT_LIMIT);