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zebra: Check active on OLD system/kernel routes

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We can assume that system/kernel routes are valid indeed
if this is our first time procesing them. But since we don't
get explicit deletion events for kernel routes anymore, we
have to be prepared to process them if the nexthop becomes
unreachable for instance. Therefore, if the route is not NEW,
then don't assume its valid.

Signed-off-by: Stephen Worley <sworley@cumulusnetworks.com>
This commit is contained in:
Stephen Worley 2019-10-17 15:41:25 -04:00
parent 2a99ab95e6
commit a8c427ee39
1 changed files with 8 additions and 2 deletions
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10
zebra/zebra_nhg.c
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@ -177,10 +177,16 @@ static int nexthop_active(afi_t afi, struct route_entry *re,
re->nexthop_mtu = 0;
/*
* If the kernel has sent us a route, then
* If the kernel has sent us a NEW route, then
* by golly gee whiz it's a good route.
*
* If its an already INSTALLED route we have already handled, then the
* kernel route's nexthop might have became unreachable
* and we have to handle that.
*/
if (re->type == ZEBRA_ROUTE_KERNEL || re->type == ZEBRA_ROUTE_SYSTEM)
if (!CHECK_FLAG(re->status, ROUTE_ENTRY_INSTALLED)
&& (re->type == ZEBRA_ROUTE_KERNEL
|| re->type == ZEBRA_ROUTE_SYSTEM))
return 1;
/*