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authorDavid S. Miller <davem@davemloft.net>2011-08-04 07:50:44 +0400
committerDavid S. Miller <davem@davemloft.net>2011-08-07 05:33:19 +0400
commit6e5714eaf77d79ae1c8b47e3e040ff5411b717ec (patch)
tree30bd0d7a6a0a6ff0ace6da1835ae7b7167cce5e4 /net/sched/act_pedit.c
parentbc0b96b54a21246e377122d54569eef71cec535f (diff)
downloadlinux-6e5714eaf77d79ae1c8b47e3e040ff5411b717ec.tar.xz
net: Compute protocol sequence numbers and fragment IDs using MD5.
Computers have become a lot faster since we compromised on the partial MD4 hash which we use currently for performance reasons. MD5 is a much safer choice, and is inline with both RFC1948 and other ISS generators (OpenBSD, Solaris, etc.) Furthermore, only having 24-bits of the sequence number be truly unpredictable is a very serious limitation. So the periodic regeneration and 8-bit counter have been removed. We compute and use a full 32-bit sequence number. For ipv6, DCCP was found to use a 32-bit truncated initial sequence number (it needs 43-bits) and that is fixed here as well. Reported-by: Dan Kaminsky <dan@doxpara.com> Tested-by: Willy Tarreau <w@1wt.eu> Signed-off-by: David S. Miller <davem@davemloft.net>
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