NSH and VxLAN-GPE

These patches add a new module to support encap/decap of Network
Service Header (NSH) as defined in:

https://tools.ietf.org/html/draft-ietf-sfc-nsh-01

Both NSH Type 1 and Type 2 metadata are supported with a simple registration
hook to allow listeners to register to see packets with Type 1 or a specific
class of Type 2 metadata. NSH could be added to packets sent over a variety
of link types, eg. VxLAN, GRE, ethernet.

Also included is an extension to VxLAN to handle the Generic Protocol
Extension (GPE) as defined in:

https://tools.ietf.org/html/draft-ietf-nvo3-vxlan-gpe-01

This allows multi-protocol encapsulation over the VxLAN so IPv4, IPv6, MPLS
and NSH encapsulated packets can be sent and received in addition to ethernet
frames. Non-ethernet frames are sent to the default destination, which
requires that the remote option is specified when creating the VxLAN device.

I've tested this by using a netfilter module to encap some app-specific
metadata in NSH type 2 and send it over the VxLAN and a listener module
to receive the corresponding decap'd metadata.

I'm also submitting a corresponding patch for iproute2 to add the gpe option
to the "ip link add type vxlan" command.

Brian Russell (2):
  nsh: encapsulation module
  vxlan: support GPE/NSH

 drivers/net/vxlan.c           | 139 ++++++++++++++--
 include/net/nsh.h             | 158 ++++++++++++++++++
 include/net/vxlan.h           |  40 ++++-
 include/uapi/linux/if_ether.h |   1 +
 include/uapi/linux/if_link.h  |   1 +
 net/ipv4/Kconfig              |  10 ++
 net/ipv4/Makefile             |   1 +
 net/ipv4/nsh.c                | 362 ++++++++++++++++++++++++++++++++++++++++++
 8 files changed, 698 insertions(+), 14 deletions(-)
 create mode 100644 include/net/nsh.h
 create mode 100644 net/ipv4/nsh.c

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2.1.4