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Fix xfrm hash collisions by changing __xfrm4_daddr_saddr_hash to hash addresses with addition

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This patch fixes hash collisions in cases where number
of entries have incrementing IP source and destination addresses
from single respective subnets (i.e. 192.168.0.1-172.16.0.1,
192.168.0.2-172.16.0.2, and so on.).

Signed-off-by: Jussi Maki <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Jussi Mäki 2009-08-06 21:38:14 +00:00 • committed by David S. Miller
commit b79a79471b
1 changed files with 1 additions and 1 deletions
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2
net/xfrm/xfrm_hash.h
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@ -16,7 +16,7 @@ static inline unsigned int __xfrm6_addr_hash(xfrm_address_t *addr)
static inline unsigned int __xfrm4_daddr_saddr_hash(xfrm_address_t *daddr, xfrm_address_t *saddr)
{
return ntohl(daddr->a4 ^ saddr->a4);
return ntohl(daddr->a4 + saddr->a4);
}
static inline unsigned int __xfrm6_daddr_saddr_hash(xfrm_address_t *daddr, xfrm_address_t *saddr)