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From: Laura Garcia Liebana <nevola@gmail.com>
To: netfilter-devel@vger.kernel.org
Cc: pablo@netfilter.org
Subject: [PATCH nf] netfilter: fix symhash with modulus one
Date: Mon, 15 Jul 2019 13:23:37 +0200	[thread overview]
Message-ID: <20190715112337.gobsm3ljlmgtarnf@nevthink> (raw)

The rule below doesn't work as the kernel raises -ERANGE.

nft add rule netdev nftlb lb01 ip daddr set \
	symhash mod 1 map { 0 : 192.168.0.10 } fwd to "eth0"

This patch allows to use the symhash modulus with one
element, in the same way that the other types of hashes and
algorithms that uses the modulus parameter.

Signed-off-by: Laura Garcia Liebana <nevola@gmail.com>
---
 net/netfilter/nft_hash.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/netfilter/nft_hash.c b/net/netfilter/nft_hash.c
index fe93e731dc7f..b836d550b919 100644
--- a/net/netfilter/nft_hash.c
+++ b/net/netfilter/nft_hash.c
@@ -129,7 +129,7 @@ static int nft_symhash_init(const struct nft_ctx *ctx,
 	priv->dreg = nft_parse_register(tb[NFTA_HASH_DREG]);
 
 	priv->modulus = ntohl(nla_get_be32(tb[NFTA_HASH_MODULUS]));
-	if (priv->modulus <= 1)
+	if (priv->modulus < 1)
 		return -ERANGE;
 
 	if (priv->offset + priv->modulus - 1 < priv->offset)
-- 
2.11.0


             reply	other threads:[~2019-07-15 11:23 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-15 11:23 Laura Garcia Liebana [this message]
2019-07-16 11:24 ` [PATCH nf] netfilter: fix symhash with modulus one Pablo Neira Ayuso

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