lib, zebra: Check for not being a blackhole route (backport #15815)#15820
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donaldsharp merged 1 commit intostable/10.0from Apr 23, 2024
Merged
lib, zebra: Check for not being a blackhole route (backport #15815)#15820donaldsharp merged 1 commit intostable/10.0from
donaldsharp merged 1 commit intostable/10.0from
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In zebra_interface_nhg_reinstall zebra is checking that the nhg is a singleton and not a blackhole nhg. This was originally done with checking that the nexthop is a NEXTHOP_TYPE_IFINDEX, NEXTHOP_TYPE_IPV4_IFINDEX and NEXTHOP_TYPE_IPV6_IFINDEX. This was excluding NEXTHOP_TYPE_IPV4 and NEXTHOP_TYPE_IPV6. These were both possible to be received and maintained from the upper level protocol for when a route is being recursively resolved. If we have gotten to this point in zebra_interface_nhg_reinstall the nexthop group has already been installed at least once and we *know* that it is actually a valid nexthop. What the test is really trying to do is ensure that we are not reinstalling a blackhole nexthop group( Which is not possible to even be here by the way, but safety first! ). So let's change to test for that instead. Signed-off-by: Donald Sharp <sharpd@nvidia.com> (cherry picked from commit 29c1ff4)
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In zebra_interface_nhg_reinstall zebra is checking that the nhg is a singleton and not a blackhole nhg. This was originally done with checking that the nexthop is a NEXTHOP_TYPE_IFINDEX, NEXTHOP_TYPE_IPV4_IFINDEX and NEXTHOP_TYPE_IPV6_IFINDEX. This was excluding NEXTHOP_TYPE_IPV4 and NEXTHOP_TYPE_IPV6. These were both possible to be received and maintained from the upper level protocol for when a route is being recursively resolved. If we have gotten to this point in zebra_interface_nhg_reinstall the nexthop group has already been installed at least once and we know that it is actually a valid nexthop. What the test is really trying to do is ensure that we are not reinstalling a blackhole nexthop group( Which is not possible to even be here by the way, but safety first! ). So let's change to test for that instead.
This is an automatic backport of pull request #15815 done by Mergify.