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Kernel: Do not use route replace when krt_metric differs

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The krt_metric is a part of the primary key, so it cannot differ for
route replace operation.

Thanks to Leif Jakob for the bugreport.
This commit is contained in:
Ondrej Zajicek 2024-05-30 16:12:15 +02:00
parent a5b4c21d81
commit 00b139bd25
1 changed files with 18 additions and 2 deletions
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20
sysdep/linux/netlink.c
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@ -1465,8 +1465,24 @@ done:
}
static inline int
nl_allow_replace(struct krt_proto *p, rte *new)
nl_allow_replace(struct krt_proto *p, rte *new, rte *old)
{
/*
* In kernel routing tables, (net, metric) is the primary key. Therefore, we
* can use NL_OP_REPLACE only if the new and and the old route have the same
* kernel metric, otherwise the replace would just add the new route while
* keep the old one.
*/
if ((p->af != AF_MPLS) && (KRT_CF->sys.metric == 0))
{
uint new_metric = ea_get_int(new->attrs->eattrs, EA_KRT_METRIC, 0);
uint old_metric = ea_get_int(old->attrs->eattrs, EA_KRT_METRIC, 0);
if (new_metric != old_metric)
return 0;
}
/*
* We use NL_OP_REPLACE for IPv4, it has an issue with not checking for
* matching rtm_protocol, but that is OK when dedicated priority is used.
@ -1495,7 +1511,7 @@ krt_replace_rte(struct krt_proto *p, net *n UNUSED, rte *new, rte *old)
{
int err = 0;
if (old && new && nl_allow_replace(p, new))
if (old && new && nl_allow_replace(p, new, old))
{
err = nl_send_route(p, new, NL_OP_REPLACE);
}