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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Pablo Neira Ayuso <pablo@netfilter.org>,
	Florian Westphal <fw@strlen.de>, Sasha Levin <sashal@kernel.org>,
	netfilter-devel@vger.kernel.org, coreteam@netfilter.org,
	netdev@vger.kernel.org
Subject: [PATCH AUTOSEL 4.14 126/371] netfilter: nft_set_hash: fix lookups with fixed size hash on big endian
Date: Thu, 16 Jan 2020 12:19:58 -0500
Message-ID: <20200116172403.18149-69-sashal@kernel.org> (raw)
In-Reply-To: <20200116172403.18149-1-sashal@kernel.org>

From: Pablo Neira Ayuso <pablo@netfilter.org>

[ Upstream commit 3b02b0adc242a72b5e46019b6a9e4f84823592f6 ]

Call jhash_1word() for the 4-bytes key case from the insertion and
deactivation path, otherwise big endian arch set lookups fail.

Fixes: 446a8268b7f5 ("netfilter: nft_set_hash: add lookup variant for fixed size hashtable")
Reported-by: Florian Westphal <fw@strlen.de>
Tested-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 net/netfilter/nft_set_hash.c | 23 +++++++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

diff --git a/net/netfilter/nft_set_hash.c b/net/netfilter/nft_set_hash.c
index 33aa2ac3a62e..73f8f99b1193 100644
--- a/net/netfilter/nft_set_hash.c
+++ b/net/netfilter/nft_set_hash.c
@@ -442,6 +442,23 @@ static bool nft_hash_lookup_fast(const struct net *net,
 	return false;
 }
 
+static u32 nft_jhash(const struct nft_set *set, const struct nft_hash *priv,
+		     const struct nft_set_ext *ext)
+{
+	const struct nft_data *key = nft_set_ext_key(ext);
+	u32 hash, k1;
+
+	if (set->klen == 4) {
+		k1 = *(u32 *)key;
+		hash = jhash_1word(k1, priv->seed);
+	} else {
+		hash = jhash(key, set->klen, priv->seed);
+	}
+	hash = reciprocal_scale(hash, priv->buckets);
+
+	return hash;
+}
+
 static int nft_hash_insert(const struct net *net, const struct nft_set *set,
 			   const struct nft_set_elem *elem,
 			   struct nft_set_ext **ext)
@@ -451,8 +468,7 @@ static int nft_hash_insert(const struct net *net, const struct nft_set *set,
 	u8 genmask = nft_genmask_next(net);
 	u32 hash;
 
-	hash = jhash(nft_set_ext_key(&this->ext), set->klen, priv->seed);
-	hash = reciprocal_scale(hash, priv->buckets);
+	hash = nft_jhash(set, priv, &this->ext);
 	hlist_for_each_entry(he, &priv->table[hash], node) {
 		if (!memcmp(nft_set_ext_key(&this->ext),
 			    nft_set_ext_key(&he->ext), set->klen) &&
@@ -491,8 +507,7 @@ static void *nft_hash_deactivate(const struct net *net,
 	u8 genmask = nft_genmask_next(net);
 	u32 hash;
 
-	hash = jhash(nft_set_ext_key(&this->ext), set->klen, priv->seed);
-	hash = reciprocal_scale(hash, priv->buckets);
+	hash = nft_jhash(set, priv, &this->ext);
 	hlist_for_each_entry(he, &priv->table[hash], node) {
 		if (!memcmp(nft_set_ext_key(&this->ext), &elem->key.val,
 			    set->klen) ||
-- 
2.20.1


       reply index

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20200116172403.18149-1-sashal@kernel.org>
2020-01-16 17:19 ` Sasha Levin [this message]
2020-01-16 17:21 ` [PATCH AUTOSEL 4.14 197/371] netfilter: ebtables: CONFIG_COMPAT: reject trailing data after last rule Sasha Levin

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