zebra: fix wrong nexthop status for kernel routes #17544
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To me, it looks like separate commits should be used for these somewhat relative issues. Also, can you create a topotest covering this case? |
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The kernel routes are wrongly selected even the nexthop interface is linkdown. Use `ip link set dev <interface> down` on the other box to set the box's nexthop interface linkdown. The kernel routes will be kept as `linkdown`, but are still with active nexthop in `zebra`. Add three changes/commits for kernel routes in this PR: 1) The active nexthop should be the operative interface. 2) Don't uninstall the kernel routes from `zebra` even no active nexthops. (It doesn't affect the kernel routes' deletion from kernel netlink messages.) 3) Update the kernel routes when the nexthop interface becomes up. Before: (during nexthop interface is linkdown) ``` K>* 3.3.3.3/32 [0/0] via 88.88.88.1, enp2s0, weight 1, 00:00:14 ``` After: (during nexthop interface is linkdown, with all three changes) ``` K 3.3.3.3/32 [0/0] via 88.88.88.1, enp2s0 inactive, weight 1, 00:00:07 ``` This commit is 1st change: Improve the judgment for "active" nexthop to be more accurate, the active nexthop should be the operative interface. Signed-off-by: anlan_cs <anlan_cs@126.com>
After the nexthop check is fixed, zebra will wrongly uninstall the kernel routes with inactive nexthop. This commit would skip the uninstallation for kernel routes. Signed-off-by: anlan_cs <anlan_cs@126.com>
Just like `link down`, check all kernel routes when interface become up. And, they maybe will be selected as the best one by zebra. Signed-off-by: anlan_cs <anlan_cs@126.com>
Signed-off-by: anlan_cs <anlan_cs@126.com>
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@riw777 Are there any plans to backport this fix to stable/10.2 branch? |
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@riw777 as stable/9.1 is affected, too - can this be backported there as well? |
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The kernel routes are wronlgy active even the nexthop interface is linkdown.
Use
ip link set dev <interface> downon the other box to set the box'snexthop interface linkdown. The kernel routes will be kept as
linkdown,but are still with active nexthop in
zebra.Add three changes for kernel routes in this commit:
zebraeven no active nexthops.(It doesn't affect the kernel routes' deletion from kernel netlink messages.)
Before: (during nexthop interface is linkdown)
After: (during nexthop interface is linkdown)