gtp: make GTP sockets in gtp_newlink optional
Having both GTPv0-U and GTPv1-U is not always desirable. Fallback from GTPv1-U to GTPv0-U was depreciated from 3GPP Rel-8 onwards. Post Rel-8 implementation are discuraged from listening on the v0 port (see 3GPP TS 29.281, Sect. 1). A future change will completely decouple the sockets from the network device. Till then, at least one of the sockets needs to be specified (either v0 or v1), the other is optional. Signed-off-by: Andreas Schultz <aschultz@tpip.net> Signed-off-by: David S. Miller <davem@davemloft.net>
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