ipv4: Fix nexthop exception hash computation.

Need to mask it with (FNHE_HASH_SIZE - 1).

Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index a5bd0b4acc614d020a9bff3a2e53dbc846c37ff5..812e4447a223f8f8278c7fd7a0a7b082b26903e6 100644 (file)
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1347,6 +1347,16 @@ static struct fib_nh_exception *fnhe_oldest(struct fnhe_hash_bucket *hash, __be3
        return oldest;
 }
 
+static inline u32 fnhe_hashfun(__be32 daddr)
+{
+       u32 hval;
+
+       hval = (__force u32) daddr;
+       hval ^= (hval >> 11) ^ (hval >> 22);
+
+       return hval & (FNHE_HASH_SIZE - 1);
+}
+
 static struct fib_nh_exception *find_or_create_fnhe(struct fib_nh *nh, __be32 daddr)
 {
        struct fnhe_hash_bucket *hash = nh->nh_exceptions;
@@ -1361,8 +1371,7 @@ static struct fib_nh_exception *find_or_create_fnhe(struct fib_nh *nh, __be32 da
                        return NULL;
        }
 
-       hval = (__force u32) daddr;
-       hval ^= (hval >> 11) ^ (hval >> 22);
+       hval = fnhe_hashfun(daddr);
        hash += hval;
 
        depth = 0;
@@ -1890,8 +1899,7 @@ static void rt_bind_exception(struct rtable *rt, struct fib_nh *nh, __be32 daddr
        struct fib_nh_exception *fnhe;
        u32 hval;
 
-       hval = (__force u32) daddr;
-       hval ^= (hval >> 11) ^ (hval >> 22);
+       hval = fnhe_hashfun(daddr);
 
        for (fnhe = rcu_dereference(hash[hval].chain); fnhe;
             fnhe = rcu_dereference(fnhe->fnhe_next)) {