linux-kernel - [PATCH 4.4 31/31] netfilter: nft_dynset: fix element timeout for HZ != 1000

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Date:   Thu, 24 Nov 2016 15:55:52 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, "Anders K. Pedersen" <akp@...aesio.com>,
        Pablo Neira Ayuso <pablo@...filter.org>
Subject: [PATCH 4.4 31/31] netfilter: nft_dynset: fix element timeout for HZ != 1000

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Anders K. Pedersen <akp@...aesio.com>

commit a8b1e36d0d1d6f51490e7adce35367ed6adb10e7 upstream.

With HZ=100 element timeout in dynamic sets (i.e. flow tables) is 10 times
higher than configured.

Add proper conversion to/from jiffies, when interacting with userspace.

I tested this on Linux 4.8.1, and it applies cleanly to current nf and
nf-next trees.

Fixes: 22fe54d5fefc ("netfilter: nf_tables: add support for dynamic set updates")
Signed-off-by: Anders K. Pedersen <akp@...aesio.com>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 net/netfilter/nft_dynset.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/net/netfilter/nft_dynset.c
+++ b/net/netfilter/nft_dynset.c
@@ -140,7 +140,8 @@ static int nft_dynset_init(const struct
 	if (tb[NFTA_DYNSET_TIMEOUT] != NULL) {
 		if (!(set->flags & NFT_SET_TIMEOUT))
 			return -EINVAL;
-		timeout = be64_to_cpu(nla_get_be64(tb[NFTA_DYNSET_TIMEOUT]));
+		timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64(
+						tb[NFTA_DYNSET_TIMEOUT])));
 	}
 
 	priv->sreg_key = nft_parse_register(tb[NFTA_DYNSET_SREG_KEY]);
@@ -227,7 +228,8 @@ static int nft_dynset_dump(struct sk_buf
 		goto nla_put_failure;
 	if (nla_put_string(skb, NFTA_DYNSET_SET_NAME, priv->set->name))
 		goto nla_put_failure;
-	if (nla_put_be64(skb, NFTA_DYNSET_TIMEOUT, cpu_to_be64(priv->timeout)))
+	if (nla_put_be64(skb, NFTA_DYNSET_TIMEOUT,
+			 cpu_to_be64(jiffies_to_msecs(priv->timeout))))
 		goto nla_put_failure;
 	if (priv->expr && nft_expr_dump(skb, NFTA_DYNSET_EXPR, priv->expr))
 		goto nla_put_failure;