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l2tp's ppp procfs output can be used to show internal state of pppol2tp. It includes a 'user-data-ok' field, which is derived from the tunnel socket's sk_user_data being non-NULL. Use tunnel->sock being non-NULL to indicate this instead. Signed-off-by: James Chapman <jchapman@katalix.com> Signed-off-by: Tom Parkin <tparkin@katalix.com> Signed-off-by: David S. Miller <davem@davemloft.net>