** Changed in: iptables (Ubuntu Impish)
   Importance: Undecided => Medium

** Changed in: iptables (Ubuntu Jammy)
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/1949603

Title:
  iptables-save -c shows incorrect counters with iptables-nft

Status in iptables package in Ubuntu:
  New
Status in iptables source package in Impish:
  New
Status in iptables source package in Jammy:
  New

Bug description:
  Starting with Impish I noticed that the kernel selftest xfrm_policy.sh
  is always failing. Initially I thought it was a kernel issue, but
  debugging further I found that the reason is that with Impish we're
  using iptables-nft by default instead of iptables-legacy.

  This test (./tools/testing/selftests/net/xfrm_policy.sh in the kernel
  source directory) is creating a bunch of network namespaces and
  checking the iptables counters for the defined policies, in particular
  this is the interesting part:

  check_ipt_policy_count()
  {
          ns=$1

          ip netns exec $ns iptables-save -c |grep policy | ( read c rest
                  ip netns exec $ns iptables -Z
                  if [ x"$c" = x'[0:0]' ]; then
                          exit 0
                  elif [ x"$c" = x ]; then
                          echo "ERROR: No counters"
                          ret=1
                          exit 111
                  else
                          exit 1
                  fi
          )
  }

  If I use iptables-nft the counters are never [0:0] as they should be,
  so the test is failing. With iptables-legacy they are [0:0] and the
  test is passing.

  Any idea why this is happening and how I can debug this in iptables?

  Thanks in advance.

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