[Bug 1771764] [NEW] iproute2: unable to add ip lwt mpls route on xenial

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The following command does not work:

$ ip route add 10.201.0.0/24 nexthop encap mpls 300 via 10.200.0.1 dev ntfp2
Error: "nexthop" or end of line is expected instead of "encap"

In fact, iproute2 version points to v4.3.0, but the xenial kernel is a 4.4.
$ ip -V
ip utility, iproute2-ss151103

=>
https://git.kernel.org/pub/scm/network/iproute2/iproute2.git/commit/?id=6720eceff7b4

With an iproute2 v4.4.0 (iproute2-ss160111), that command works:
$ modprobe mpls_iptunnel
$ ./ip/ip route add 10.201.0.0/24 nexthop encap mpls 300 via 10.200.0.1 dev ntfp2
$ ./ip/ip r
[snip]
10.201.0.0/24  encap mpls  300 via 10.200.0.1 dev ntfp2

At least, this patch is missing:
1e5293056a02 ("lwtunnel: Add encapsulation support to ip route")
https://git.kernel.org/pub/scm/network/iproute2/iproute2.git/commit/?id=1e5293056a02

** Affects: iproute2 (Ubuntu)
     Importance: Undecided
         Status: Incomplete


** Tags: patch xenial
-- 
iproute2: unable to add ip lwt mpls route on xenial
https://bugs.launchpad.net/bugs/1771764
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