+ return 0;
+}
+
+static int link_update_flags(Link *link, unsigned flags) {
+ int r;
+
+ assert(link);
+ assert(link->network);
+
+ if (link->state == LINK_STATE_FAILED)
+ return 0;
+
+ if (link->flags == flags)
+ return 0;
+
+ if ((link->flags & IFF_UP) != (flags & IFF_UP))
+ log_info_link(link,
+ "link is %s", flags & IFF_UP ? "up": "down");
+
+ if ((link->flags & IFF_LOWER_UP) != (flags & IFF_LOWER_UP)) {
+ if (flags & IFF_LOWER_UP) {
+ log_info_link(link, "carrier on");
+
+ if (link->network->dhcp || link->network->ipv4ll) {
+ r = link_acquire_conf(link);
+ if (r < 0) {
+ log_warning_link(link, "Could not acquire configuration: %s", strerror(-r));
+ link_enter_failed(link);
+ return r;
+ }
+ }
+ } else {
+ log_info_link(link, "carrier off");
+
+ if (link->network->dhcp) {
+ r = sd_dhcp_client_stop(link->dhcp_client);
+ if (r < 0) {
+ log_warning_link(link, "Could not stop DHCPv4 client: %s", strerror(-r));
+ link_enter_failed(link);
+ return r;
+ }
+ }
+
+ if (link->network->ipv4ll) {
+ r = sd_ipv4ll_stop(link->ipv4ll);
+ if (r < 0) {
+ log_warning_link(link, "Could not stop IPv4 link-local: %s", strerror(-r));
+ link_enter_failed(link);
+ return r;
+ }
+ }
+ }
+ }
+
+ log_debug_link(link, "link status updated: %#.8x -> %#.8x",
+ link->flags, flags);
+
+ link->flags = flags;
+
+ return 0;
+}
+
+static int link_up_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
+ Link *link = userdata;
+ int r;
+
+ assert(link);
+
+ if (link->state == LINK_STATE_FAILED)
+ return 1;
+
+ r = sd_rtnl_message_get_errno(m);
+ if (r >= 0)
+ link_update_flags(link, link->flags | IFF_UP);
+ else
+ log_struct_link(LOG_WARNING, link,
+ "MESSAGE=%s: could not bring up interface: %s",
+ link->ifname, strerror(-r),
+ "ERRNO=%d", -r,
+ NULL);
+ return 1;
+}
+
+static int link_up(Link *link) {
+ _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL;
+ int r;
+
+ assert(link);
+ assert(link->manager);
+ assert(link->manager->rtnl);
+
+ log_debug_link(link, "bringing link up");
+
+ r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
+ RTM_SETLINK, link->ifindex);
+ if (r < 0) {
+ log_error_link(link, "Could not allocate RTM_SETLINK message");
+ return r;
+ }
+
+ r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
+ if (r < 0) {
+ log_error_link(link, "Could not set link flags: %s", strerror(-r));
+ return r;
+ }
+
+ r = sd_rtnl_call_async(link->manager->rtnl, req, link_up_handler, link, 0, NULL);
+ if (r < 0) {
+ log_error_link(link,
+ "Could not send rtnetlink message: %s", strerror(-r));
+ return r;
+ }
+
+ return 0;
+}
+
+static int link_enslaved(Link *link) {
+ int r;
+
+ assert(link);
+ assert(link->state == LINK_STATE_ENSLAVING);
+ assert(link->network);
+
+ r = link_up(link);
+ if (r < 0) {
+ link_enter_failed(link);
+ return r;
+ }
+
+ if (!link->network->dhcp && !link->network->ipv4ll)
+ return link_enter_set_addresses(link);
+
+ return 0;
+}
+
+static int enslave_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
+ Link *link = userdata;
+ int r;
+
+ assert(link);
+ assert(link->state == LINK_STATE_ENSLAVING || link->state == LINK_STATE_FAILED);
+ assert(link->network);
+
+ link->enslaving --;
+
+ if (link->state == LINK_STATE_FAILED)
+ return 1;
+
+ r = sd_rtnl_message_get_errno(m);
+ if (r < 0) {
+ log_struct_link(LOG_ERR, link,
+ "MESSAGE=%s: could not enslave: %s",
+ link->ifname, strerror(-r),
+ "ERRNO=%d", -r,
+ NULL);
+ link_enter_failed(link);
+ return 1;
+ }
+
+ log_debug_link(link, "enslaved");
+
+ if (link->enslaving == 0)
+ link_enslaved(link);
+
+ return 1;
+}
+
+static int link_enter_enslave(Link *link) {
+ NetDev *vlan, *macvlan;
+ Iterator i;
+ int r;
+
+ assert(link);
+ assert(link->network);
+ assert(link->state == _LINK_STATE_INVALID);
+
+ link->state = LINK_STATE_ENSLAVING;
+
+ link_save(link);
+
+ if (!link->network->bridge && !link->network->bond &&
+ hashmap_isempty(link->network->vlans) &&
+ hashmap_isempty(link->network->macvlans))
+ return link_enslaved(link);
+
+ if (link->network->bridge) {
+ log_struct_link(LOG_DEBUG, link,
+ "MESSAGE=%s: enslaving by '%s'",
+ link->ifname, link->network->bridge->name,
+ NETDEV(link->network->bridge),
+ NULL);
+
+ r = netdev_enslave(link->network->bridge, link, &enslave_handler);
+ if (r < 0) {
+ log_struct_link(LOG_WARNING, link,
+ "MESSAGE=%s: could not enslave by '%s': %s",
+ link->ifname, link->network->bridge->name, strerror(-r),
+ NETDEV(link->network->bridge),
+ NULL);
+ link_enter_failed(link);