[Bug 2039280] Re: Support IP address protocol

[Andreas Hasenack]

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https://bugs.launchpad.net/bugs/2039280

Title:
  Support IP address protocol

Status in iproute2 package in Ubuntu:
  Confirmed
Status in iproute2 source package in Mantic:
  Confirmed

Bug description:
  [Impact]

  IPv4 and IPv6 addresses can be assigned a protocol value that indicates the
  provenance of the IP address. The attribute is modeled after ip route
  protocols, and essentially allows the administrator or userspace stack to
  tag addresses in some way that makes sense to the actor in question.
  Support for this feature was merged with commit 47f0bd503210 ("net: Add new
  protocol attribute to IP addresses"), for kernel 5.18.

  In this patch, add support for setting the protocol attribute at IP address
  addition, replacement, and listing requests.

  [Fix]

  Apply the attached patch

  [How to test]

  $ cat << EOF > test.sh
  #!/bin/sh

  addr=192.0.2.1/28
  addr2=${addr%/*}2/${addr#*/}
  ifr=test-dummy123

  sudo ip link add name "$ifr" type dummy
  sudo ip link set "$ifr" up

  sudo ip address add dev "$ifr" "$addr2" proto 0x99

  sudo ip link del "$ifr"
  EOF

  $chmod +x test.sh
  $test.sh
  $ echo $?
  0

  if you get an error instead, like:
  Error: either "local" is duplicate, or "proto" is a garbage.

  your iproute2 is not patched.
  Alternativerly, you could download Linux v6.5 source code and run:

  $ cd linux
  $ sudo ./tools/testing/selftests/net/rtnetlink.sh -t kci_test_address_proto

  [Regression potential]

  Two clean upstream cherry-picks, regression potential should be low.

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