Add support to tcpdump for decoding the GPRS Tunnelling Protocol (GTP),
used to carry GPRS data over IP for GSM and UMTS networks. The decoder
understands GTPv0, GTPv0', GTPv1-C, GTPv1-U and GTPv1' t

Add support to tcpdump for decoding the GPRS Tunnelling Protocol (GTP),
used to carry GPRS data over IP for GSM and UMTS networks. The decoder
understands GTPv0, GTPv0', GTPv1-C, GTPv1-U and GTPv1' traffic, however
at this stage not all TLV fields are fully decoded.

This work has been kindly sponsored by SystemNet AS (www.systemnet.no).

"commit" deraadt@

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