Jonas Bonn 91ed81f9ab
gtp: support SGSN-side tunnels ...
The GTP-tunnel driver is explicitly GGSN-side as it searches for PDP
contexts based on the incoming packets _destination_ address. If we
want to place ourselves on the SGSN side of the tunnel, then we want
to be identifying PDP contexts based on _source_ address.
Let it be noted that in a "real" configuration this module would never
be used: the SGSN normally does not see IP packets as input. The
justification for this functionality is for PGW load-testing applications
where the input to the SGSN is locally generally IP traffic.
This patch adds a "role" argument at GTP-link creation time to specify
whether we are on the GGSN or SGSN side of the tunnel; this flag is then
used to determine which part of the IP packet to use in determining
the PDP context.
Signed-off-by: Jonas Bonn <jonas@southpole.se >
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org >
Acked-by: Harald Welte <laforge@gnumonks.org >
Signed-off-by: David S. Miller <davem@davemloft.net >
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91ed81f9ab