tree 65f071401201bf2c48c4fa9f2029994b7f1efeac
parent 8cb1239889087368a792c655de99529eec219bfc
author Eric Dumazet <edumazet@google.com> 1553715633 -0700
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1560064690 +0200

inet: switch IP ID generator to siphash

[ Upstream commit df453700e8d81b1bdafdf684365ee2b9431fb702 ]

According to Amit Klein and Benny Pinkas, IP ID generation is too weak
and might be used by attackers.

Even with recent net_hash_mix() fix (netns: provide pure entropy for net_hash_mix())
having 64bit key and Jenkins hash is risky.

It is time to switch to siphash and its 128bit keys.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Amit Klein <aksecurity@gmail.com>
Reported-by: Benny Pinkas <benny@pinkas.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>