Support full CONE NAT and ADDRESS RESTRICTED CONE NAT

Added support for Full cone NAT and Address Restricted Cone
NAT using the NATTYPE module.

Change-Id: Ib17f87757b86fdb88bbe25bab7d7193b0530f812
Signed-off-by: Smita Ghosh <smitag@codeaurora.org>
msm: netfilter: NATTYPE Refresh Timer Changes.

When IPA is present, all the data packets go through IPA
and as a result NATTYPE entry timeout will not be refreshed
and eventually it times out. IPA periodically refreshes
the connection tracking entry timeout. So make changes to refresh
the NATTYPE entry timeout from the connection tracking module.

Change-Id: I5861427990af4bfd6046d21809a778409d0d8d5f
Signed-off-by: Niranjan Reddy Dumbala <ndumba@codeaurora.org>
msm: netfilter: NATTYPE Refresh Timer Changes

NATTYPE entry timeout will not be updated when packets
start flowing through IPA and eventually can timeout.
Make changes to refresh the NATTYPE entry timeout from
the connection tracking netlink module which is used by
IPANAT to update conntrack timeout. Also make the timeout
dynamic by taking the expiry timeout value from connection
tracking entry. Otherwise NATTYPE entry will not timeout
even when all the corresponding conntrack entries expire.

CRs-FIXED: 490813
Change-Id: Ibb225d7b91070ca9948c7a11f0b5925a8435915c
Signed-off-by: Tyler Wear <twear@codeaurora.org>
netfilter: Add of NATTYPE COOKIE Check

Add NATTYPE COOKIE to avoid invalid access of NATTYPE
entry from the conntrack module. This compensates for
possible garbage values in the conntrack entry, which
would cause potential errors.

Change-Id: I1a53fa0dc6961dd3e53d382642b413d4ee781ed6
Signed-off-by: Tyler Wear <twear@codeaurora.org>
Signed-off-by: Devendra Patel <cdevenp@codeaurora.org>