tree 5f868e340b74cc03ee7f7f19fd12af0c08a422a8
parent 8c27bd75f04fb9cb70c69c3cfe24f4e6d8e15906
author Florian Westphal <fw@strlen.de> 1379709176 +0200
committer David S. Miller <davem@davemloft.net> 1380033598 -0400

tcp: syncookies: reduce mss table to four values

Halve mss table size to make blind cookie guessing more difficult.
This is sad since the tables were already small, but there
is little alternative except perhaps adding more precise mss information
in the tcp timestamp.  Timestamps are unfortunately not ubiquitous.

Guessing all possible cookie values still has 8-in 2**32 chance.

Reported-by: Jakob Lell <jakob@jakoblell.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>