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ipv4: Fix nexthop exception hash computation. 

Need to mask it with (FNHE_HASH_SIZE - 1).

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2012-07-17 13:23:08 -07:00
parent a6ff1a2f1e
commit d3a25c980f
1 changed files with 12 additions and 4 deletions
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16
net/ipv4/route.c
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@ -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)) {