From 3b02b0adc242a72b5e46019b6a9e4f84823592f6 Mon Sep 17 00:00:00 2001 From: Pablo Neira Ayuso Date: Mon, 25 Feb 2019 14:13:41 +0100 Subject: netfilter: nft_set_hash: fix lookups with fixed size hash on big endian 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 Tested-by: Florian Westphal Signed-off-by: Pablo Neira Ayuso --- net/netfilter/nft_set_hash.c | 23 +++++++++++++++++++---- 1 file changed, 19 insertions(+), 4 deletions(-) (limited to 'net/netfilter') diff --git a/net/netfilter/nft_set_hash.c b/net/netfilter/nft_set_hash.c index 339a9dd1c832..8d5611634a56 100644 --- a/net/netfilter/nft_set_hash.c +++ b/net/netfilter/nft_set_hash.c @@ -474,6 +474,23 @@ 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) @@ -483,8 +500,7 @@ 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) && @@ -523,8 +539,7 @@ 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) && -- cgit v1.2.3-59-g8ed1b