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In commit3f27fb2321("ipv6: addrconf: add per netns perturbation in inet6_addr_hash()"), I added net_hash_mix() in inet6_addr_hash() to get better hash dispersion, at a time all netns were sharing the hash table. Since then, commit21a216a8fc("ipv6/addrconf: allocate a per netns hash table") made the hash table per netns. We could remove the net_hash_mix() from inet6_addr_hash(), but there is still an issue with ipv6_addr_hash(). It is highly predictable and a malicious user can easily create thousands of IPv6 addresses all stored in the same hash bucket. Switch to __ipv6_addr_jhash(). We could use a dedicated secret, or reuse net_hash_mix() as I did in this patch. Signed-off-by: Eric Dumazet <edumazet@google.com> Reviewed-by: David Ahern <dsahern@kernel.org> Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com> Link: https://patch.msgid.link/20241008120101.734521-1-edumazet@google.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>