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authorPablo Neira Ayuso <pablo@netfilter.org>2019-02-25 14:13:41 +0100
committerPablo Neira Ayuso <pablo@netfilter.org>2019-02-27 11:08:31 +0100
commit3b02b0adc242a72b5e46019b6a9e4f84823592f6 (patch)
treee91829c558cff3db252717d80c4c5161f62c93af /net/netfilter
parentnetfilter: remove unneeded switch fall-through (diff)
downloadlinux-dev-3b02b0adc242a72b5e46019b6a9e4f84823592f6.tar.xz
linux-dev-3b02b0adc242a72b5e46019b6a9e4f84823592f6.zip
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 <fw@strlen.de> Tested-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net/netfilter')
-rw-r--r--net/netfilter/nft_set_hash.c23
1 files changed, 19 insertions, 4 deletions
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) &&