From: andy zhou <azhou@ovn.org>
Date: Mon, 21 Aug 2017 12:38:53 -0700
Subject: netfilter: nf_tables: Fix nft limit burst handling
Patch-mainline: v4.13
Git-commit: c26844eda9d4fdbd266660e3b3de2d0270e3a1ed
References: bsc#1076830

Current implementation treats the burst configuration the same as
rate configuration. This can cause the per packet cost to be lower
than configured. In effect, this bug causes the token bucket to be
refilled at a higher rate than what user has specified.

This patch changes the implementation so that the token bucket size
is controlled by "rate + burst", while maintain the token bucket
refill rate the same as user specified.

Fixes: 96518518cc41 ("netfilter: add nftables")
Signed-off-by: Andy Zhou <azhou@ovn.org>
Acked-by: Joe Stringer <joe@ovn.org>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Acked-by: Michal Kubecek <mkubecek@suse.cz>

---
 net/netfilter/nft_limit.c | 25 ++++++++++++++-----------
 1 file changed, 14 insertions(+), 11 deletions(-)

diff --git a/net/netfilter/nft_limit.c b/net/netfilter/nft_limit.c
index 18dd57a52651..14538b1d4d11 100644
--- a/net/netfilter/nft_limit.c
+++ b/net/netfilter/nft_limit.c
@@ -65,19 +65,23 @@ static int nft_limit_init(struct nft_limit *limit,
 	limit->nsecs = unit * NSEC_PER_SEC;
 	if (limit->rate == 0 || limit->nsecs < unit)
 		return -EOVERFLOW;
-	limit->tokens = limit->tokens_max = limit->nsecs;
-
-	if (tb[NFTA_LIMIT_BURST]) {
-		u64 rate;
 
+	if (tb[NFTA_LIMIT_BURST])
 		limit->burst = ntohl(nla_get_be32(tb[NFTA_LIMIT_BURST]));
+	else
+		limit->burst = 0;
+
+	if (limit->rate + limit->burst < limit->rate)
+		return -EOVERFLOW;
 
-		rate = limit->rate + limit->burst;
-		if (rate < limit->rate)
-			return -EOVERFLOW;
+	/* The token bucket size limits the number of tokens can be
+	 * accumulated. tokens_max specifies the bucket size.
+	 * tokens_max = unit * (rate + burst) / rate.
+	 */
+	limit->tokens = div_u64(limit->nsecs * (limit->rate + limit->burst),
+				limit->rate);
+	limit->tokens_max = limit->tokens;
 
-		limit->rate = rate;
-	}
 	if (tb[NFTA_LIMIT_FLAGS]) {
 		u32 flags = ntohl(nla_get_be32(tb[NFTA_LIMIT_FLAGS]));
 
@@ -95,9 +99,8 @@ static int nft_limit_dump(struct sk_buff *skb, const struct nft_limit *limit,
 {
 	u32 flags = limit->invert ? NFT_LIMIT_F_INV : 0;
 	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(rate),
+	if (nla_put_be64(skb, NFTA_LIMIT_RATE, cpu_to_be64(limit->rate),
 			 NFTA_LIMIT_PAD) ||
 	    nla_put_be64(skb, NFTA_LIMIT_UNIT, cpu_to_be64(secs),
 			 NFTA_LIMIT_PAD) ||
-- 
2.15.1