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The name sccp_connection is used in the osmo-sccp code, sccp_connections
was used in the NAT for tracking a sccp_connection. Rename it so it is
obvious that the struct belongs to the nat.
The rename was done with sed:
$ sed -i s,"struct sccp_connections","struct nat_sccp_connection",g \
include/openbsc/*.h src/osmo-bsc_nat/* tests/*/*
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Do the auth check in bsc_nat_filter_sccp_cr, remove the cause from
the signature again. For the bsc_nat_filter_dt restructure the flow
but leave the auth inside the id response message.
Return 1 when the IMSI has been extracted as indicator for running
the auth check. 1 has not been used before and is safe to be used
as this indicator.
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For the new barr feature get the cause struct down to the imsi_auth
code so we can add the blacklist there.
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In preparation for another kind of black-list allow the filter code
to decide how the connection should be rejected. Introduce a new struct
that will carry the reject causes for certain operations.
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Move all routines related to filtering to a separate file.
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