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device: don't disable IPv6 in stage3 on reapply

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Currently, when a call to Reapply() results in stage3 being re-run, IPv6
ends up messed up. Like this:

  $ nmcli device modify eth0 ipv4.address ''
  $ nmcli device modify eth0 ipv4.address 172.31.13.37/24
  $

  NetworkManager[666]: <debug> [1751286095.2070] device[c95ca04a69467d81] (eth0): ip4: reapply...
  ...
  NetworkManager[666]: <debug> [1751286095.2104] device[c95ca04a69467d81] (eth0): ip6: addrgenmode6: set none (already set)
  NetworkManager[666]: <debug> [1751286095.2105] device[c95ca04a69467d81] (eth0): ip6: addrgenmode6: toggle disable_ipv6 sysctl after disabling addr-gen-mode
  NetworkManager[666]: <debug> [1751286095.2105] platform-linux: sysctl: setting '/proc/sys/net/ipv6/conf/eth0/disable_ipv6' to '1' (current value is '0')
  NetworkManager[666]: <debug> [1751286095.2106] platform-linux: sysctl: setting '/proc/sys/net/ipv6/conf/eth0/disable_ipv6' to '0' (current value is '1')
  NetworkManager[666]: <debug> [1751286095.2106] platform-linux: sysctl: setting '/proc/sys/net/ipv6/conf/eth0/accept_ra' to '0' (current value is identical)
  NetworkManager[666]: <debug> [1751286095.2106] platform-linux: sysctl: setting '/proc/sys/net/ipv6/conf/eth0/disable_ipv6' to '0' (current value is identical)

Not only is this unnecessary because addr-gen-mode already has the
desired value (as is logged), but also wipes off all IPv6 configuration.
This is fine on initial configuration, but not on Reapply().

Let's look at the device state first: if we've progressed past ip-config
state, then we can't possibly ever touch the offending sysctls. It's
okay -- we don't need to: addr-gen-mode is going to be set right if we
went through ip-config before.

Resolves: https://issues.redhat.com/browse/NMT-1681

https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/merge_requests/2232
(cherry picked from commit 9bbb113987)
This commit is contained in:
Lubomir Rintel 2025-06-30 15:50:44 +02:00
parent 6eeab380fa
commit d16a62da2b
1 changed files with 2 additions and 1 deletions
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3
src/core/devices/nm-device.c
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@ -13438,7 +13438,8 @@ activate_stage3_ip_config(NMDevice *self)
* IPv6LL if this is not an assumed connection, since assumed connections
* will already have IPv6 set up.
*/
if (!nm_device_managed_type_is_external_or_assume(self))
if ((priv->state <= NM_DEVICE_STATE_IP_CONFIG || priv->ip_data_6.do_reapply)
&& !nm_device_managed_type_is_external_or_assume(self))
_dev_addrgenmode6_set(self, NM_IN6_ADDR_GEN_MODE_NONE);
/* Re-enable IPv6 on the interface */