discrepancy in podman network inspect for netmask (compat API)

[idleroamer]

Is this a BUG REPORT or FEATURE REQUEST? (leave only one on its own line)

/kind bug

Description

podman main: The netmask of secondaryIPAddresses/SecondaryIPv6Addresses in container network inspect compat API is always zero.

podman v3: Wrong type used for secondaryIPAddresses/SecondaryIPv6Addresses (string instead of network.Address) results in broken
container inspect compat API in presence of secondary network interfaces.

Steps to reproduce the issue:
Reproduction in main branch

1. create a named network namespace and setup two veth interface

ip netns add test
ip netns exec test /bin/bash
ip link add enp2s0 type veth peer name eth0
ip addr add 10.0.1.0/24 dev eth0
ip link set eth0 up
ip link add enp2s1 type veth peer name eth1
ip addr add 10.0.2.0/24 dev eth1
ip link set eth1 up
exit

2. run a container and join the created network namespace

podman run --net ns:/run/netns/test --name test -it alpine /bin/sh

3. start a podman service

podman system service tcp:localhost:20000 --log-level=debug --time=0

4. Check output of podman inspect test

 curl -X GET 'http://127.0.0.1:20000/v3.0.0/containers/test/json'| jq

Describe the results you received:
PrefixLen is 0

"NetworkSettings": {
    "Bridge": "",
    "SandboxID": "",
    "HairpinMode": false,
    "LinkLocalIPv6Address": "",
    "LinkLocalIPv6PrefixLen": 0,
    "Ports": {},
    "SandboxKey": "",
    "SecondaryIPAddresses": [
      {
        "Addr": "10.0.2.0",
        "PrefixLen": 0
      }

Describe the results you expected:
PrefixLen should be 24

Output of podman version:

podman version 4.0.0-dev

Output of podman info --debug:

host:
  arch: amd64
  buildahVersion: 1.24.1
  cgroupControllers:
  - cpuset
  - cpu
  - cpuacct
  - blkio
  - memory
  - devices
  - freezer
  - net_cls
  - perf_event
  - net_prio
  - pids
  cgroupManager: systemd
  cgroupVersion: v1
  conmon:
    package: conmon-2.0.27+git0+3efab3e71c-r0.core2_64
    path: /usr/bin/conmon
    version: 'conmon version 2.0.28-dev, commit: 3efab3e71c4c29f127cd7b8e8a5a885fc17dec88'
  cpus: 6
  distribution:
    distribution: mbient
    version: "1.0"
  eventLogger: journald
  hostname: qemux86-64
  idMappings:
    gidmap: null
    uidmap: null
  kernel: 5.10.30-yocto-standard
  linkmode: dynamic
  logDriver: journald
  memFree: 7883513856
  memTotal: 22187085824
  networkBackend: cni
  ociRuntime:
    name: crun
    package: crun-0.18+gitf302dd8c02c6fddd2c50d1685d82b7a19aae8afe-r0.core2_64
    path: /usr/bin/crun
    version: |-
      crun version 0.19.5-f302-dirty
      commit: f302dd8c02c6fddd2c50d1685d82b7a19aae8afe
      spec: 1.0.0
      +SYSTEMD +SELINUX +APPARMOR +CAP +SECCOMP +EBPF +YAJL
  os: linux
  remoteSocket:
    path: /run/podman/podman.sock
  security:
    apparmorEnabled: true
    capabilities: CAP_AUDIT_WRITE,CAP_CHOWN,CAP_DAC_OVERRIDE,CAP_FOWNER,CAP_FSETID,CAP_KILL,CAP_MKNOD,CAP_NET_BIND_SERVICE,CAP_NET_RAW,CAP_SETFCAP,CAP_SETGID,CAP_SETPCAP,CAP_SETUID,CAP_SYS_CHROOT
    rootless: false
    seccompEnabled: true
    seccompProfilePath: ""
    selinuxEnabled: false
  serviceIsRemote: false
  slirp4netns:
    executable: /usr/bin/slirp4netns
    package: slirp4netns-0.4.1-r0.core2_64
    version: |-
      slirp4netns version 0.4.1
      commit: unknown
  swapFree: 46133248
  swapTotal: 46133248
  uptime: 6h 6m 42.11s (Approximately 0.25 days)
plugins:
  log:
  - k8s-file
  - none
  - passthrough
  - journald
  network:
  - bridge
  - macvlan
  - ipvlan
  volume:
  - local
registries:
  search:
  - docker.io
  - registry.fedoraproject.org
  - quay.io
  - registry.access.redhat.com
  - registry.centos.org
store:
  configFile: /etc/containers/storage.conf
  containerStore:
    number: 6
    paused: 0
    running: 3
    stopped: 3
  graphDriverName: overlay
  graphOptions:
    overlay.mountopt: nodev
  graphRoot: /mnt/systemdata/dynamic-contents/podman
  graphStatus:
    Backing Filesystem: extfs
    Native Overlay Diff: "true"
    Supports d_type: "true"
    Using metacopy: "false"
  imageCopyTmpDir: /var/tmp
  imageStore:
    number: 2
  runRoot: /var/run/containers/storage
  volumePath: /mnt/systemdata/dynamic-contents/podman/volumes
version:
  APIVersion: 4.0.0-dev
  Built: 1655756421
  BuiltTime: Mon Jun 20 22:20:21 2022
  GitCommit: 192dea7d981443a8091596eb91e6c4274b8a6f85
  GoVersion: go1.18.3
  OsArch: linux/amd64
  Version: 4.0.0-dev

Have you tested with the latest version of Podman and have you checked the Podman Troubleshooting Guide? (https://github.com/containers/podman/blob/main/troubleshooting.md)

Yes