| 2021-11-19 15:15:08 |
Nicolas Dichtel |
description |
[Impact]
When tuntap interfaces are slaves of a bonding interface, arp monitoring is fails
This is fixed upstream with commit a31d27fbed5d ("tun: fix bonding active backup with arp monitoring"). It will be included in linux v5.16.
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a31d27fbed5d
[Test Case]
Create a bonding with two tuntap interfaces and arp monitoring configured. Before the patch, slave interfaces are flapping continuously.
Example:
Nov 19 16:12:28 dut-vm kernel: bond0: (slave ntfp2): link status definitely up
Nov 19 16:12:28 dut-vm kernel: bond0: (slave ntfp2): making interface the new active one
Nov 19 16:12:28 dut-vm kernel: bond0: active interface up!
Nov 19 16:12:31 dut-vm kernel: bond0: (slave ntfp2): link status definitely down, disabling slave
Nov 19 16:12:31 dut-vm kernel: bond0: now running without any active interface!
Nov 19 16:12:32 dut-vm kernel: bond0: (slave ntfp2): link status definitely up
Nov 19 16:12:32 dut-vm kernel: bond0: (slave ntfp2): making interface the new active one
Nov 19 16:12:32 dut-vm kernel: bond0: active interface up!
Nov 19 16:12:35 dut-vm kernel: bond0: (slave ntfp2): link status definitely down, disabling slave
Nov 19 16:12:35 dut-vm kernel: bond0: now running without any active interface!
Nov 19 16:12:36 dut-vm kernel: bond0: (slave ntfp2): link status definitely up
Nov 19 16:12:36 dut-vm kernel: bond0: (slave ntfp2): making interface the new active one
Nov 19 16:12:36 dut-vm kernel: bond0: active interface up!
Nov 19 16:12:37 dut-vm kernel: bond0: (slave ntfp3): link status definitely up
Nov 19 16:12:39 dut-vm kernel: bond0: (slave ntfp2): link status definitely down, disabling slave
Nov 19 16:12:39 dut-vm kernel: bond0: (slave ntfp3): making interface the new active one
[Regression Potential]
The patch is trivial, the potential regressions are low. |
[Impact]
When tuntap interfaces are slaves of a bonding interface, arp monitoring is unusable.
This is fixed upstream with commit a31d27fbed5d ("tun: fix bonding active backup with arp monitoring"). It will be included in linux v5.16.
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a31d27fbed5d
[Test Case]
Create a bonding with two tuntap interfaces and arp monitoring configured. Before the patch, slave interfaces are flapping continuously.
Example:
Nov 19 16:12:28 dut-vm kernel: bond0: (slave ntfp2): link status definitely up
Nov 19 16:12:28 dut-vm kernel: bond0: (slave ntfp2): making interface the new active one
Nov 19 16:12:28 dut-vm kernel: bond0: active interface up!
Nov 19 16:12:31 dut-vm kernel: bond0: (slave ntfp2): link status definitely down, disabling slave
Nov 19 16:12:31 dut-vm kernel: bond0: now running without any active interface!
Nov 19 16:12:32 dut-vm kernel: bond0: (slave ntfp2): link status definitely up
Nov 19 16:12:32 dut-vm kernel: bond0: (slave ntfp2): making interface the new active one
Nov 19 16:12:32 dut-vm kernel: bond0: active interface up!
Nov 19 16:12:35 dut-vm kernel: bond0: (slave ntfp2): link status definitely down, disabling slave
Nov 19 16:12:35 dut-vm kernel: bond0: now running without any active interface!
Nov 19 16:12:36 dut-vm kernel: bond0: (slave ntfp2): link status definitely up
Nov 19 16:12:36 dut-vm kernel: bond0: (slave ntfp2): making interface the new active one
Nov 19 16:12:36 dut-vm kernel: bond0: active interface up!
Nov 19 16:12:37 dut-vm kernel: bond0: (slave ntfp3): link status definitely up
Nov 19 16:12:39 dut-vm kernel: bond0: (slave ntfp2): link status definitely down, disabling slave
Nov 19 16:12:39 dut-vm kernel: bond0: (slave ntfp3): making interface the new active one
[Regression Potential]
The patch is trivial, the potential regressions are low. |
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