Merge branch 'vxlan-vnifiltering'

Roopa Prabhu says:

====================
vxlan metadata device vnifiltering support

This series adds vnifiltering support to vxlan collect metadata device.

Motivation:
You can only use a single vxlan collect metadata device for a given
vxlan udp port in the system today. The vxlan collect metadata device
terminates all received vxlan packets. As shown in the below diagram,
there are use-cases where you need to support multiple such vxlan devices in
independent bridge domains. Each vxlan device must terminate the vni's
it is configured for.
Example usecase: In a service provider network a service provider
typically supports multiple bridge domains with overlapping vlans.
One bridge domain per customer. Vlans in each bridge domain are
mapped to globally unique vxlan ranges assigned to each customer.

This series adds vnifiltering support to collect metadata devices to
terminate only configured vnis. This is similar to vlan filtering in
bridge driver. The vni filtering capability is provided by a new flag on
collect metadata device.

In the below pic:
	- customer1 is mapped to br1 bridge domain
	- customer2 is mapped to br2 bridge domain
	- customer1 vlan 10-11 is mapped to vni 1001-1002
	- customer2 vlan 10-11 is mapped to vni 2001-2002
	- br1 and br2 are vlan filtering bridges
	- vxlan1 and vxlan2 are collect metadata devices with
	  vnifiltering enabled

┌──────────────────────────────────────────────────────────────────┐
│  switch                                                          │
│                                                                  │
│         ┌───────────┐                 ┌───────────┐              │
│         │           │                 │           │              │
│         │   br1     │                 │   br2     │              │
│         └┬─────────┬┘                 └──┬───────┬┘              │
│     vlans│         │               vlans │       │               │
│     10,11│         │                10,11│       │               │
│          │     vlanvnimap:               │    vlanvnimap:        │
│          │       10-1001,11-1002         │      10-2001,11-2002  │
│          │         │                     │       │               │
│   ┌──────┴┐     ┌──┴─────────┐       ┌───┴────┐  │               │
│   │ swp1  │     │vxlan1      │       │ swp2   │ ┌┴─────────────┐ │
│   │       │     │  vnifilter:│       │        │ │vxlan2        │ │
│   └───┬───┘     │   1001,1002│       └───┬────┘ │ vnifilter:   │ │
│       │         └────────────┘           │      │  2001,2002   │ │
│       │                                  │      └──────────────┘ │
│       │                                  │                       │
└───────┼──────────────────────────────────┼───────────────────────┘
        │                                  │
        │                                  │
  ┌─────┴───────┐                          │
  │  customer1  │                    ┌─────┴──────┐
  │ host/VM     │                    │customer2   │
  └─────────────┘                    │ host/VM    │
                                     └────────────┘

v2:
  - remove stale xstats declarations pointed out by Nikolay Aleksandrov
  - squash selinux patch with the tunnel api patch as pointed out by
    benjamin poirier
  - Fix various build issues:
	Reported-by: kernel test robot <lkp@intel.com>

v3:
  - incorporate review feedback from Jakub
	- move rhashtable declarations to c file
	- define and use netlink policy for top level vxlan filter api
	- fix unused stats function warning
	- pass vninode from vnifilter lookup into stats count function
		to avoid another lookup (only applicable to vxlan_rcv)
	- fix missing vxlan vni delete notifications in vnifilter uninit
	  function
	- misc cleanups
  - remote dev check for multicast groups added via vnifiltering api
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

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