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Commit 3e87baaf authored by Pablo Neira Ayuso's avatar Pablo Neira Ayuso
Browse files

netfilter: nft_limit: add burst parameter 



This patch adds the burst parameter. This burst indicates the number of packets
that can exceed the limit.

Signed-off-by: default avatarPablo Neira Ayuso <pablo@netfilter.org>
parent f8d3a6bc

include/uapi/linux/netfilter/nf_tables.h

+2 −0
Original line number Diff line number Diff line
@@ -761,11 +761,13 @@ enum nft_ct_attributes { 
 *

 * @NFTA_LIMIT_RATE: refill rate (NLA_U64)

 * @NFTA_LIMIT_UNIT: refill unit (NLA_U64)

 * @NFTA_LIMIT_BURST: burst (NLA_U32)

 */

enum nft_limit_attributes {

	NFTA_LIMIT_UNSPEC,

	NFTA_LIMIT_RATE,

	NFTA_LIMIT_UNIT,

	NFTA_LIMIT_BURST,

	__NFTA_LIMIT_MAX

};

#define NFTA_LIMIT_MAX		(__NFTA_LIMIT_MAX - 1)

net/netfilter/nft_limit.c

+18 −2
Original line number Diff line number Diff line
@@ -25,6 +25,7 @@ struct nft_limit { 
	u64		tokens_max;

	u64		rate;

	u64		nsecs;

	u32		burst;

};



static inline bool nft_limit_eval(struct nft_limit *limit, u64 cost)
@@ -65,6 +66,18 @@ static int nft_limit_init(struct nft_limit *limit, 
	if (limit->rate == 0 || limit->nsecs < unit)

		return -EOVERFLOW;

	limit->tokens = limit->tokens_max = limit->nsecs;



	if (tb[NFTA_LIMIT_BURST]) {

		u64 rate;



		limit->burst = ntohl(nla_get_be32(tb[NFTA_LIMIT_BURST]));



		rate = limit->rate + limit->burst;

		if (rate < limit->rate)

			return -EOVERFLOW;



		limit->rate = rate;

	}

	limit->last = ktime_get_ns();



	return 0;
@@ -73,9 +86,11 @@ static int nft_limit_init(struct nft_limit *limit, 
static int nft_limit_dump(struct sk_buff *skb, const struct nft_limit *limit)

{

	u64 secs = div_u64(limit->nsecs, NSEC_PER_SEC);

	u64 rate = limit->rate - limit->burst;



	if (nla_put_be64(skb, NFTA_LIMIT_RATE, cpu_to_be64(limit->rate)) ||

	    nla_put_be64(skb, NFTA_LIMIT_UNIT, cpu_to_be64(secs)))

	if (nla_put_be64(skb, NFTA_LIMIT_RATE, cpu_to_be64(rate)) ||

	    nla_put_be64(skb, NFTA_LIMIT_UNIT, cpu_to_be64(secs)) ||

	    nla_put_be32(skb, NFTA_LIMIT_BURST, htonl(limit->burst)))

		goto nla_put_failure;

	return 0;
@@ -96,6 +111,7 @@ static void nft_limit_pkts_eval(const struct nft_expr *expr, 
static const struct nla_policy nft_limit_policy[NFTA_LIMIT_MAX + 1] = {

	[NFTA_LIMIT_RATE]	= { .type = NLA_U64 },

	[NFTA_LIMIT_UNIT]	= { .type = NLA_U64 },

	[NFTA_LIMIT_BURST]	= { .type = NLA_U32 },

};



static int nft_limit_pkts_init(const struct nft_ctx *ctx,