network: do not make link in configured state when no address is assigned

When DHCP6 and RA are enabled, and RA does not provide any addresses,
then link may become configured state even if no address is assigned,
due to the time-lag between RA completion and DHCP reply.
This makes if DHCP is explicitly enabled, then link must have at least
one valid address to be in the configured state.

diff --git a/src/network/networkd-link.c b/src/network/networkd-link.c
index c6fa56cc6a0371c472d9c8ae49854db0baa218bd..4c16255a7547b84987629cca54b3a7377102e1a8 100644 (file)
--- a/src/network/networkd-link.c
+++ b/src/network/networkd-link.c
@@ -1168,6 +1168,11 @@ void link_check_ready(Link *link) {
                         return;
                 }
 
+                if ((link_dhcp4_enabled(link) || link_dhcp6_enabled(link)) && set_isempty(link->addresses)) {
+                        log_link_debug(link, "%s(): DHCP4 or DHCP6 is enabled but no address is assigned yet.", __func__);
+                        return;
+                }
+
                 if (link_dhcp4_enabled(link) || link_dhcp6_enabled(link) || dhcp6_get_prefix_delegation(link) || link_ipv6_accept_ra_enabled(link)) {
                         if (!link->dhcp4_configured &&
                             !(link->dhcp6_address_configured && link->dhcp6_route_configured) &&