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| author | David S. Miller | 2011-12-28 21:06:58 +0100 |
|---|---|---|
| committer | David S. Miller | 2011-12-28 21:06:58 +0100 |
| commit | 2c2aba6c561ac425602f4a0be61422224cb87151 (patch) | |
| tree | 30b5f2c40b823ca61e2e0930d5e98a89a83222bb /include/net/ndisc.h | |
| parent | netrom: avoid overflows in nr_setsockopt() (diff) | |
| download | kernel-qcow2-linux-2c2aba6c561ac425602f4a0be61422224cb87151.tar.gz kernel-qcow2-linux-2c2aba6c561ac425602f4a0be61422224cb87151.tar.xz kernel-qcow2-linux-2c2aba6c561ac425602f4a0be61422224cb87151.zip | |
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 <davem@davemloft.net>
Diffstat (limited to 'include/net/ndisc.h')
| -rw-r--r-- | include/net/ndisc.h | 9 |
1 files changed, 9 insertions, 0 deletions
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); |