From 75e72f05418afbeac0a707d2e0cc9451ceb47e43 Mon Sep 17 00:00:00 2001 From: Laura Garcia Liebana Date: Mon, 23 Apr 2018 12:48:07 +0200 Subject: [PATCH] netfilter: nft_numgen: enable hashing of one element The modulus in the hash function was limited to > 1 as initially there was no sense to create a hashing of just one element. Nevertheless, there are certain cases specially for load balancing where this case needs to be addressed. This patch fixes the following error. Error: Could not process rule: Numerical result out of range add rule ip nftlb lb01 dnat to jhash ip saddr mod 1 map { 0: 192.168.0.10 } ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ The solution comes to force the hash to 0 when the modulus is 1. Signed-off-by: Laura Garcia Liebana --- 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 24f2f7567ddb..e235c17f1b8b 100644 --- a/net/netfilter/nft_hash.c +++ b/net/netfilter/nft_hash.c @@ -97,7 +97,7 @@ static int nft_jhash_init(const struct nft_ctx *ctx, priv->len = len; 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) -- 2.30.2