1) Imports ENCAP_MPLS labels from IPv4/IPv6 routes.
Note that this requires libnl 3.6.0 or newer.
In previous patches, the fib_path_ext_t had a path ID of -1.
After a long investigation, it turned out to be caused by route weight
being set to 0. There is a comment explaining more details.
2) Handles MPLS routes.
MPLS routes were wrongly added as IPv4 routes before.
POP and SWAP are now both supported.
All the routes are installed as NON-EOS and EOS routes,
as the Linux kernel does not differentiate.
EOS POP used in PHP uses the next-hop address family
to determine the resulting address family.
This patch is sufficient for P setups.
PE setups with implicit null should also function okay, as long as a
seperate label gets programmed per address family.
PE setups with explicit null will also forward packets,
but punting is a bit odd and needs MPLS input enabled on the LCP host
device.
Make sure to enable MPLS in VPP first.
3) Propagate MPLS input state to LCP Pair and Linux.
Since the Linux kernel uses the MPLS routes itself,
the LCP pair tap needs MPLS enabled to allow host originated packets.
This also syncs the Linux `net.mpls.conf.<host_if>.input` sysctl to
allow punted packets to have MPLS labels, mostly explicit nulls.
For that to work, load the mpls kernel modules.
4) Cross connect MPLS packets from Linux directly to interface-output
This is a port of https://gerrit.fd.io/r/c/vpp/+/38702
This is the first in a series of functions that aims to copy forward
interface changes in the VPP dataplane into the linux interfaces.
Capture link state changes (set interface state ...) and apply them
to Linux.
There's an important dissonance here:
- When Linux sets a parent interface up, all children also go up.
ip link set enp66s0f1 down
ip link add link enp66s0f1 name foo type vlan id 1234
ip link set foo down
ip link | grep enp66s0f1
9: enp66s0f1: <BROADCAST,MULTICAST> mtu 9000 qdisc mq state DOWN mode DEFAULT group default qlen 1000
61: foo@enp66s0f1: <BROADCAST,MULTICAST,M-DOWN> mtu 9000 qdisc noop state DOWN mode DEFAULT group default qlen 1000
ip link set enp66s0f1 up
ip link | grep s0f1
9: enp66s0f1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9000 qdisc mq state UP mode DEFAULT group default qlen 1000
61: foo@enp66s0f1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9000 qdisc noqueue state UP mode DEFAULT group default qlen 1000
While in VPP this is not so, there each individual interface and
sub-interface stands for itself. I think the proper fix here is to walk
all sub-interfaces when a phy changes, and force a sync of those from
VPP to LCP as well. I'll do that in a followup commit so it's easier to
roll back.
When I started in my copy, I removed a bunch of code and options that I
felt were distracting. I also renamed lots of elements like 'linux-cp'
and 'Linux CP' and 'Linux-CP' to just be 'lcpng'.
Now, rename all of this back, and make it ready for upstreaming.
The only diffs between my repo and upstream now are the includes and the
lcpng_interface.[ch] code changes, which is good.
