From 2c2aba6c561ac425602f4a0be61422224cb87151 Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Wed, 28 Dec 2011 15:06:58 -0500 Subject: ipv6: Use universal hash for NDISC. In order to perform a proper universal hash on a vector of integers, we have to use different universal hashes on each vector element. Which means we need 4 different hash randoms for ipv6. Signed-off-by: David S. Miller --- include/net/ndisc.h | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'include/net/ndisc.h') diff --git a/include/net/ndisc.h b/include/net/ndisc.h index c977c377c015..e9c30023b784 100644 --- a/include/net/ndisc.h +++ b/include/net/ndisc.h @@ -79,6 +79,15 @@ struct nd_opt_hdr { __u8 nd_opt_len; } __packed; +static inline u32 ndisc_hashfn(const void *pkey, const struct net_device *dev, __u32 *hash_rnd) +{ + const u32 *p32 = pkey; + + return (((p32[0] ^ dev->ifindex) * hash_rnd[0]) + + (p32[1] * hash_rnd[1]) + + (p32[2] * hash_rnd[2]) + + (p32[3] * hash_rnd[3])); +} extern int ndisc_init(void); -- cgit v1.2.3