+ assert(link);
+ assert(link->network);
+ assert(link->state == _LINK_STATE_INVALID);
+
+ r = link_get(link);
+ if (r < 0) {
+ link_enter_failed(link);
+ return r;
+ }
+
+ return link_enter_join_bridge(link);
+}
+
+static int address_drop_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
+ Link *link = userdata;
+ int r;
+
+ assert(m);
+ assert(link);
+ assert(link->ifname);
+
+ if (link->state == LINK_STATE_FAILED)
+ return 1;
+
+ r = sd_rtnl_message_get_errno(m);
+ if (r < 0 && r != -EEXIST)
+ log_warning("%s: could not drop address: %s",
+ link->ifname, strerror(-r));
+
+ return 1;
+}
+
+static void dhcp_handler(sd_dhcp_client *client, int event, void *userdata) {
+ Link *link = userdata;
+ struct in_addr address;
+ struct in_addr netmask;
+ struct in_addr gateway;
+ int prefixlen;
+ int r;
+
+ assert(link);
+
+ if (link->state == LINK_STATE_FAILED)
+ return;
+
+ if (event < 0) {
+ log_warning("%s: DHCP error: %s", link->ifname, strerror(-event));
+ link_enter_failed(link);
+ return;
+ }
+
+ if (event == DHCP_EVENT_NO_LEASE)
+ log_debug("%s: IP address in use.", link->ifname);
+
+ if (event == DHCP_EVENT_IP_CHANGE || event == DHCP_EVENT_EXPIRED ||
+ event == DHCP_EVENT_STOP) {
+ address_drop(link->dhcp_address, link, address_drop_handler);
+
+ address_free(link->dhcp_address);
+ link->dhcp_address = NULL;
+
+ route_free(link->dhcp_route);
+ link->dhcp_route = NULL;
+ }
+
+ r = sd_dhcp_client_get_address(client, &address);
+ if (r < 0) {
+ log_warning("%s: DHCP error: no address", link->ifname);
+ link_enter_failed(link);
+ return;
+ }
+
+ r = sd_dhcp_client_get_netmask(client, &netmask);
+ if (r < 0) {
+ log_warning("%s: DHCP error: no netmask", link->ifname);
+ link_enter_failed(link);
+ return;
+ }
+
+ prefixlen = sd_dhcp_client_prefixlen(&netmask);
+ if (prefixlen < 0) {
+ log_warning("%s: DHCP error: no prefixlen", link->ifname);
+ link_enter_failed(link);
+ return;
+ }
+
+ r = sd_dhcp_client_get_router(client, &gateway);
+ if (r < 0) {
+ log_warning("%s: DHCP error: no router", link->ifname);
+ link_enter_failed(link);
+ return;
+ }
+
+ if (event == DHCP_EVENT_IP_CHANGE || event == DHCP_EVENT_IP_ACQUIRE) {
+ _cleanup_address_free_ Address *addr = NULL;
+ _cleanup_route_free_ Route *rt = NULL;
+
+ log_info("%s: received config over DHCPv4", link->ifname);
+
+ r = address_new_dynamic(&addr);
+ if (r < 0) {
+ log_error("Could not allocate address");
+ link_enter_failed(link);
+ return;
+ }
+
+ addr->family = AF_INET;
+ addr->in_addr.in = address;
+ addr->prefixlen = prefixlen;
+ addr->netmask = netmask;
+
+ r = route_new_dynamic(&rt);
+ if (r < 0) {
+ log_error("Could not allocate route");
+ link_enter_failed(link);
+ return;
+ }
+
+ rt->family = AF_INET;
+ rt->in_addr.in = gateway;
+
+ link->dhcp_address = addr;
+ link->dhcp_route = rt;
+ addr = NULL;
+ rt = NULL;
+
+ link_enter_set_addresses(link);
+ }
+
+ return;
+}
+
+static int link_acquire_conf(Link *link) {
+ int r;
+
+ assert(link);
+ assert(link->network);
+ assert(link->network->dhcp);
+ assert(link->manager);
+ assert(link->manager->event);
+
+ if (!link->dhcp) {
+ link->dhcp = sd_dhcp_client_new(link->manager->event);
+ if (!link->dhcp)
+ return -ENOMEM;
+
+ r = sd_dhcp_client_set_index(link->dhcp, link->ifindex);
+ if (r < 0)
+ return r;
+
+ r = sd_dhcp_client_set_mac(link->dhcp, &link->mac);
+ if (r < 0)
+ return r;