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network/route: update MTU of IPv6 route even if the kernel returns -EEXIST

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This commit is contained in:
Yu Watanabe 2024-01-20 15:55:06 +09:00
parent 696f5da420
commit 1c62c4fe0b
1 changed files with 13 additions and 0 deletions
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13
src/network/networkd-route.c
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@ -874,6 +874,19 @@ int route_configure_handler_internal(sd_netlink *rtnl, sd_netlink_message *m, Li
* notification, so we need to update the timer here. */
existing->lifetime_usec = route->lifetime_usec;
(void) route_setup_timer(existing, NULL);
/* This may be a bug in the kernel, but the MTU of an IPv6 route can be updated only
* when the route has an expiration timer managed by the kernel (not by us).
* See fib6_add_rt2node() in net/ipv6/ip6_fib.c of the kernel. */
if (existing->family == AF_INET6 &&
existing->expiration_managed_by_kernel) {
r = route_metric_set(&existing->metric, RTAX_MTU, route_metric_get(&route->metric, RTAX_MTU));
if (r < 0) {
log_oom();
link_enter_failed(link);
return 0;
}
}
}
} else if (r < 0) {