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«bearer-mbim: avoid attempting to load deactivated IP types» broke IP-type IPv4v6

1cd78cc2 «bearer-mbim: avoid attempting to load deactivated IP types» by @aleksm broke IP-type IPv4v6.

After connecting an IPv4v6 bearer, ModemManager only returns IPv4 information. This is evident by the mmcli -b output as well as from the actual IP addresses and routes applied to the interface by NetworkManager.

Current master (29d9dc7e) behaves as follows (debug log):

[tore:~/git/ModemManager] master ± /tmp/mm/bin/mmcli -m 0 --simple-connect=apn=telenor.smart,ip-type=ipv4v6
successfully connected the modem
[tore:~/git/ModemManager] master ± /tmp/mm/bin/mmcli -m 0 -b 1
  --------------------------------
  General            |       path: /org/freedesktop/ModemManager1/Bearer/1
                     |       type: default
  --------------------------------
  Status             |  connected: yes
                     |  suspended: no
                     |  interface: wwp0s20f0u3c3
                     | ip timeout: 20
  --------------------------------
  Properties         |        apn: telenor.smart
                     |    roaming: allowed
                     |    ip type: ipv4v6
  --------------------------------
  IPv4 configuration |     method: static
                     |    address: 10.167.4.204
                     |     prefix: 29
                     |    gateway: 10.167.4.201
                     |        dns: 193.213.112.4, 130.67.15.198
                     |        mtu: 1500
  --------------------------------
  Statistics         |   attempts: 1

Current master with 1cd78cc2 reverted, on the other hand, behaves like this (debug log):

[tore:~/git/ModemManager] master ± git revert 1cd78cc28a9c82be70b56731636bb9299bdd1fb2
Auto-merging src/mm-bearer-mbim.c
[master 2809b366] Revert "bearer-mbim: avoid attempting to load deactivated IP types"
 1 file changed, 5 deletions(-)
[tore:~/git/ModemManager] master(1) ± /tmp/mm/bin/mmcli -m 0 --simple-connect=apn=telenor.smart,ip-type=ipv4v6
successfully connected the modem
[tore:~/git/ModemManager] master(1) ± /tmp/mm/bin/mmcli -m 0 -b 1
  --------------------------------
  General            |       path: /org/freedesktop/ModemManager1/Bearer/1
                     |       type: default
  --------------------------------
  Status             |  connected: yes
                     |  suspended: no
                     |  interface: wwp0s20f0u3c3
                     | ip timeout: 20
  --------------------------------
  Properties         |        apn: telenor.smart
                     |    roaming: allowed
                     |    ip type: ipv4v6
  --------------------------------
  IPv4 configuration |     method: static
                     |    address: 10.167.4.204
                     |     prefix: 29
                     |    gateway: 10.167.4.201
                     |        dns: 193.213.112.4, 130.67.15.198
                     |        mtu: 1500
  --------------------------------
  IPv6 configuration |     method: static
                     |    address: 2a02:2121:34e:26fb:5a2c:80ff:fe13:9208
                     |     prefix: 64
                     |    gateway: ::
                     |        dns: 2001:4600:4:fff::52, 2001:4600:4:1fff::52
                     |        mtu: 1500
  --------------------------------
  Statistics         |   attempts: 1

This bug is present in the latest ModemManager-1.14.10-1.fc33.x86_64 in Fedora 33. It can be successfully worked around with dnf downgrade ModemManager-1.14.2-1.fc33, however.

Edited by Tore Anderson
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