+ return 0;
+}
+
+static int link_bridge_joined(Link *link) {
+ int r;
+
+ assert(link);
+ assert(link->state == LINK_STATE_JOINING_BRIDGE);
+ assert(link->network);
+
+ r = link_up(link);
+ if (r < 0) {
+ link_enter_failed(link);
+ return r;
+ }
+
+ if (!link->network->dhcp)
+ return link_enter_set_addresses(link);
+
+ return 0;
+}
+
+static int bridge_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
+ Link *link = userdata;
+ int r;
+
+ assert(link);
+ assert(link->state == LINK_STATE_JOINING_BRIDGE || link->state == LINK_STATE_FAILED);
+ assert(link->network);
+
+ if (link->state == LINK_STATE_FAILED)
+ return 1;
+
+ r = sd_rtnl_message_get_errno(m);
+ if (r < 0) {
+ log_warning("%s: could not join bridge '%s': %s",
+ link->ifname, link->network->bridge->name, strerror(-r));
+ link_enter_failed(link);
+ return 1;
+ } else
+ log_debug("%s: joined bridge '%s'",
+ link->ifname, link->network->bridge->name);
+
+ link_bridge_joined(link);
+
+ return 1;
+}
+
+static int link_enter_join_bridge(Link *link) {
+ int r;
+
+ assert(link);
+ assert(link->network);
+ assert(link->state == _LINK_STATE_INVALID);
+
+ link->state = LINK_STATE_JOINING_BRIDGE;
+
+ if (!link->network->bridge)
+ return link_bridge_joined(link);
+
+ log_debug("%s: joining bridge", link->ifname);
+
+ r = bridge_join(link->network->bridge, link, &bridge_handler);
+ if (r < 0) {
+ log_warning("%s: could not join bridge '%s'", link->ifname,
+ link->network->bridge->name);
+ link_enter_failed(link);
+ return r;
+ }
+
+ return 0;
+}
+
+static int link_get_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) {
+ log_warning("%s: could not get state: %s",
+ link->ifname, strerror(-r));
+ link_enter_failed(link);
+ }
+
+ log_debug("%s: got link state", link->ifname);
+
+ link_update(link, m);
+
+ return 1;
+}
+
+static int link_get(Link *link) {
+ _cleanup_sd_rtnl_message_unref_ sd_rtnl_message *req = NULL;
+ int r;
+
+ assert(link);
+ assert(link->manager);
+ assert(link->manager->rtnl);
+
+ log_debug("%s: requesting link status", link->ifname);
+
+ r = sd_rtnl_message_link_new(RTM_GETLINK, link->ifindex, &req);
+ if (r < 0) {
+ log_error("Could not allocate RTM_GETLINK message");
+ return r;
+ }
+
+ r = sd_rtnl_call_async(link->manager->rtnl, req, link_get_handler, link, 0, NULL);
+ if (r < 0) {
+ log_error("Could not send rtnetlink message: %s", strerror(-r));
+ return r;
+ }
+
+ return 0;
+}
+
+int link_configure(Link *link) {
+ int r;
+
+ 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;
+
+ r = sd_dhcp_client_set_callback(link->dhcp, dhcp_handler, link);
+ if (r < 0)
+ return r;
+ }
+
+ r = sd_dhcp_client_start(link->dhcp);
+ if (r < 0)
+ return r;
+
+ return 0;
+}
+
+int link_update(Link *link, sd_rtnl_message *m) {
+ unsigned flags;
+ int r;
+
+ assert(link);
+ assert(link->network);
+ assert(m);
+
+ if (link->state == LINK_STATE_FAILED)
+ return 0;
+
+ r = sd_rtnl_message_link_get_flags(m, &flags);
+ if (r < 0) {
+ log_warning("%s: could not get link flags", link->ifname);
+ return r;
+ }
+
+ if (link->flags & IFF_UP && !(flags & IFF_UP))
+ log_info("%s: interface is down", link->ifname);
+ else if (!(link->flags & IFF_UP) && flags & IFF_UP)
+ log_info("%s: interface is up", link->ifname);
+
+ if (link->flags & IFF_LOWER_UP && !(flags & IFF_LOWER_UP)) {
+ log_info("%s: disconnected", link->ifname);
+
+ if (link->network->dhcp) {
+ r = sd_dhcp_client_stop(link->dhcp);
+ if (r < 0) {
+ link_enter_failed(link);
+ return r;
+ }
+ }
+ } else if (!(link->flags & IFF_LOWER_UP) && flags & IFF_LOWER_UP) {
+ log_info("%s: connected", link->ifname);
+
+ if (link->network->dhcp) {
+ r = link_acquire_conf(link);
+ if (r < 0) {
+ link_enter_failed(link);
+ return r;
+ }
+ }
+ }
+
+ link->flags = flags;
+
+ log_debug("%s: updated link state", link->ifname);