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ipv4: use siphash instead of Jenkins in fnhe_hashfun()

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A group of security researchers brought to our attention
the weakness of hash function used in fnhe_hashfun().

Lets use siphash instead of Jenkins Hash, to considerably
reduce security risks.

Also remove the inline keyword, this really is distracting.

Fixes: d546c62154 ("ipv4: harden fnhe_hashfun()")
Signed-off-by: Eric Dumazet <[email protected]>
Reported-by: Keyu Man <[email protected]>
Cc: Willy Tarreau <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Eric Dumazet authored and David S. Miller committed 2021-08-26 10:20:34 +01:00
1 parent 4785305c05
commit 6457378fe7
1 file changed
+6 -6
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net/ipv4/route.c
+6 -6
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@@ -600,14 +600,14 @@ static struct fib_nh_exception *fnhe_oldest(struct fnhe_hash_bucket *hash)
return oldest;
}
static inline u32 fnhe_hashfun(__be32 daddr)
static u32 fnhe_hashfun(__be32 daddr)
{
static u32 fnhe_hashrnd __read_mostly;
u32 hval;
static siphash_key_t fnhe_hash_key __read_mostly;
u64 hval;
net_get_random_once(&fnhe_hashrnd, sizeof(fnhe_hashrnd));
hval = jhash_1word((__force u32)daddr, fnhe_hashrnd);
return hash_32(hval, FNHE_HASH_SHIFT);
net_get_random_once(&fnhe_hash_key, sizeof(fnhe_hash_key));
hval = siphash_1u32((__force u32)daddr, &fnhe_hash_key);
return hash_64(hval, FNHE_HASH_SHIFT);
}
static void fill_route_from_fnhe(struct rtable *rt, struct fib_nh_exception *fnhe)