l2tp: Split pppol2tp patch into separate l2tp and ppp parts

This patch splits the pppol2tp driver into separate L2TP and PPP parts
to prepare for L2TPv3 support. In L2TPv3, protocols other than PPP can
be carried, so this split creates a common L2TP core that will handle
the common L2TP bits which protocol support modules such as PPP will
use.

Note that the existing pppol2tp module is split into l2tp_core and
l2tp_ppp by this change.

There are no feature changes here. Internally, however, there are
significant changes, mostly to handle the separation of PPP-specific
data from the L2TP session and to provide hooks in the core for
modules like PPP to access.

Signed-off-by: James Chapman <jchapman@katalix.com>
Reviewed-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 6 deletions

diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index 2cffcb84a241..a55bff26a264 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -3158,17 +3158,12 @@ config PPPOATM
 
 config PPPOL2TP
         tristate "PPP over L2TP (EXPERIMENTAL)"
-        depends on EXPERIMENTAL && PPP && INET
+        depends on EXPERIMENTAL && L2TP && PPP
         help
           Support for PPP-over-L2TP socket family. L2TP is a protocol
           used by ISPs and enterprises to tunnel PPP traffic over UDP
           tunnels. L2TP is replacing PPTP for VPN uses.
 
-          This kernel component handles only L2TP data packets: a
-          userland daemon handles L2TP the control protocol (tunnel
-          and session setup). One such daemon is OpenL2TP
-          (http://openl2tp.sourceforge.net/).
-
 config SLIP
         tristate "SLIP (serial line) support"
         ---help---