Merge branch 'netlink-add-lwtunnel-encap-sub-message-support-to-rt-route'

Hangbin Liu says:

====================
netlink: add lwtunnel encap sub-message support to rt-route

This series adds YNL sub-message support for lwtunnel encap data in
the rt-route netlink family, and describes the tunnel-specific
attribute sets that were previously opaque binary blobs.

The kernel currently emits encap_type after the encap payload nest,
but YNL sub-message parsing needs the selector (encap_type) first to
dispatch on the correct attribute set. Patch 1 reorders the kernel
output, and patch 2 teaches the YNL C code generator to convert enum
selectors to their string form for sub-message dispatch.

Patches 3-6 extend the rt-route YAML spec.

Tested with ynl selftest and checked with following cmds

 # modprobe ila
 # modprobe xfrm_interface
 # ip addr add 10.1.0.1/24 dev lo
 # ip link add geneve1 type geneve id 1 remote 10.1.0.2 ttl 64
 # ip link set geneve1 up
 # ip route add 10.1.0.0/24 dev lo encap mpls 100 via 10.1.0.254
 # ip route add 1.1.1.0/24 encap ip id 1 geneve_opts 1:1:1212121234567891,2:2:1212121234567892,3:3:1212121234567893 dst 10.1.0.2 dev geneve1
 # ip route add 2001:db8:3::/64 dev lo encap ila 1:2:3:4 csum-mode no-action ident-type luid hook-type output
 # ip route add 2001:db8:4::/64 dev lo encap ip6 id 1 dst 2001:db8::5 src 2001:db8::1 hoplimit 64
 # ip route add 2001:db8:5::/64 dev lo encap seg6 mode inline segs 2001:db8::1
 # ip route add 2001:db8:6::/65 dev lo encap seg6local action End flavors psp,next-csid lblen 32 nflen 16
 # ip route add 2001:db8:7::/65 dev lo encap bpf in ob /tmp/kself/net/lib/xdp_dummy.bpf.o sec xdp
 # ip route add 2001:db8:8::/64 dev lo encap rpl segs 2001:db8::1
 # ip route add 2001:db8:9::/64 encap ioam6 trace prealloc type 0x800000 ns 0 size 4 dev lo
 # ip route add 2001:db8:10::/64 dev lo encap xfrm if_id 100
 # ip route show
 1.1.1.0/24  encap ip id 1 src 0.0.0.0 dst 10.1.0.2 ttl 0 tos 0
        geneve_opts 1:1:1212121234567891,2:2:1212121234567892,3:3:1212121234567893 dev geneve1 scope link
 10.1.0.0/24  encap mpls  100 via 10.1.0.254 dev lo
 # ip -6 route show
 2001:db8:3::/64  encap ila  1:2:3:4  csum-mode no-action  ident-type luid  hook-type output dev lo metric 1024 pref medium
 2001:db8:4::/64  encap ip6 id 1 src 2001:db8::1 dst 2001:db8::5 hoplimit 64 tc 0 dev lo metric 1024 pref medium
 2001:db8:5::/64  encap seg6 mode inline segs 2 [ 2001:db8::1 :: ] dev lo metric 1024 pref medium
 2001:db8:6::/65  encap seg6local action End flavors psp,next-csid lblen 32 nflen 16 dev lo metric 1024 pref medium
 2001:db8:7::/65  encap bpf in xdp_dummy.bpf.o:[xdp] dev lo metric 1024 pref medium
 2001:db8:8::/64  encap rpl segs 1 [ 2001:db8::1 ] dev lo metric 1024 pref medium
 2001:db8:9::/64  encap ioam6 freq 1/1 mode inline trace prealloc type 0x800000 ns 0 size 4 dev lo metric 1024 pref medium
 2001:db8:10::/64  encap xfrm if_id 100 dev lo metric 1024 pref medium
 # ./tools/net/ynl/pyynl/cli.py --family rt-route --dump getroute > /tmp/route_dump.json

All the result looks good.
====================

Link: https://patch.msgid.link/20261008-ynl_rt_encap-v4-0-4ed2ccf7f949@kylinos.cn
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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