+ return 0;
+}
+
+static int dhcp_lease_lost(Link *link) {
+ _cleanup_address_free_ Address *address = NULL;
+ struct in_addr addr;
+ struct in_addr netmask;
+ unsigned prefixlen;
+ int r;
+
+ assert(link);
+ assert(link->dhcp_lease);
+
+ log_warning_link(link, "DHCP lease lost");
+
+ r = address_new_dynamic(&address);
+ if (r >= 0) {
+ sd_dhcp_lease_get_address(link->dhcp_lease, &addr);
+ sd_dhcp_lease_get_netmask(link->dhcp_lease, &netmask);
+ prefixlen = net_netmask_to_prefixlen(&netmask);
+
+ address->family = AF_INET;
+ address->in_addr.in = addr;
+ address->prefixlen = prefixlen;
+
+ address_drop(address, link, &address_drop_handler);
+ }
+
+ if (link->network->dhcp_mtu) {
+ uint16_t mtu;
+
+ r = sd_dhcp_lease_get_mtu(link->dhcp_lease, &mtu);
+ if (r >= 0 && link->original_mtu != mtu) {
+ r = link_set_mtu(link, link->original_mtu);
+ if (r < 0) {
+ log_warning_link(link, "DHCP error: could not reset MTU");
+ link_enter_failed(link);
+ return r;
+ }
+ }
+ }
+
+ if (link->network->dhcp_hostname) {
+ const char *hostname = NULL;
+
+ r = sd_dhcp_lease_get_hostname(link->dhcp_lease, &hostname);
+ if (r >= 0 && hostname) {
+ r = set_hostname(link->manager->bus, "");
+ if (r < 0)
+ log_error("Failed to reset transient hostname");
+ }
+ }
+
+ link->dhcp_lease = sd_dhcp_lease_unref(link->dhcp_lease);
+
+ return 0;
+}
+
+static int dhcp_lease_acquired(sd_dhcp_client *client, Link *link) {
+ sd_dhcp_lease *lease;
+ struct in_addr address;
+ struct in_addr netmask;
+ struct in_addr gateway;
+ unsigned prefixlen;
+ struct in_addr *nameservers;
+ size_t nameservers_size;
+ int r;
+
+ assert(client);
+ assert(link);
+
+ r = sd_dhcp_client_get_lease(client, &lease);
+ if (r < 0) {
+ log_warning_link(link, "DHCP error: no lease: %s",
+ strerror(-r));
+ return r;
+ }
+
+ r = sd_dhcp_lease_get_address(lease, &address);
+ if (r < 0) {
+ log_warning_link(link, "DHCP error: no address: %s",
+ strerror(-r));
+ return r;
+ }
+
+ r = sd_dhcp_lease_get_netmask(lease, &netmask);
+ if (r < 0) {
+ log_warning_link(link, "DHCP error: no netmask: %s",
+ strerror(-r));
+ return r;
+ }
+
+ prefixlen = net_netmask_to_prefixlen(&netmask);
+
+ r = sd_dhcp_lease_get_router(lease, &gateway);
+ if (r < 0) {
+ log_warning_link(link, "DHCP error: no router: %s",
+ strerror(-r));
+ return r;
+ }
+
+ log_struct_link(LOG_INFO, link,
+ "MESSAGE=%s: DHCPv4 address %u.%u.%u.%u/%u via %u.%u.%u.%u",
+ link->ifname,
+ ADDRESS_FMT_VAL(address),
+ prefixlen,
+ ADDRESS_FMT_VAL(gateway),
+ "ADDRESS=%u.%u.%u.%u",
+ ADDRESS_FMT_VAL(address),
+ "PREFIXLEN=%u",
+ prefixlen,
+ "GATEWAY=%u.%u.%u.%u",
+ ADDRESS_FMT_VAL(gateway),
+ NULL);
+
+ link->dhcp_lease = lease;
+
+ if (link->network->dhcp_dns) {
+ r = sd_dhcp_lease_get_dns(lease, &nameservers, &nameservers_size);
+ if (r >= 0) {
+ r = manager_update_resolv_conf(link->manager);
+ if (r < 0)
+ log_error("Failed to update resolv.conf");
+ }
+ }
+
+ if (link->network->dhcp_mtu) {
+ uint16_t mtu;
+
+ r = sd_dhcp_lease_get_mtu(lease, &mtu);
+ if (r >= 0) {
+ r = link_set_mtu(link, mtu);
+ if (r < 0)
+ log_error_link(link, "Failed to set MTU "
+ "to %" PRIu16, mtu);
+ }
+ }
+
+ if (link->network->dhcp_hostname) {
+ const char *hostname;
+
+ r = sd_dhcp_lease_get_hostname(lease, &hostname);
+ if (r >= 0) {
+ r = set_hostname(link->manager->bus, hostname);
+ if (r < 0)
+ log_error("Failed to set transient hostname "
+ "to '%s'", hostname);
+ }
+ }
+
+ link_enter_set_addresses(link);
+
+ return 0;
+}
+
+static void dhcp_handler(sd_dhcp_client *client, int event, void *userdata) {
+ Link *link = userdata;
+ int r;
+
+ assert(link);
+ assert(link->network);
+ assert(link->manager);
+
+ if (link->state == LINK_STATE_FAILED)
+ return;
+
+ switch (event) {
+ case DHCP_EVENT_NO_LEASE:
+ log_debug_link(link, "IP address in use.");
+ break;
+ case DHCP_EVENT_EXPIRED:
+ case DHCP_EVENT_STOP:
+ case DHCP_EVENT_IP_CHANGE:
+ if (link->network->dhcp_critical) {
+ log_error_link(link, "DHCPv4 connection considered system critical, "
+ "ignoring request to reconfigure it.");
+ return;
+ }
+
+ if (link->dhcp_lease) {
+ r = dhcp_lease_lost(link);
+ if (r < 0) {
+ link_enter_failed(link);
+ return;
+ }
+ }
+
+ if (event == DHCP_EVENT_IP_CHANGE) {
+ r = dhcp_lease_acquired(client, link);
+ if (r < 0) {
+ link_enter_failed(link);
+ return;
+ }
+ }
+
+ if (event == DHCP_EVENT_EXPIRED && link->network->ipv4ll) {
+ r = sd_ipv4ll_start (link->ipv4ll);
+ if (r < 0) {
+ link_enter_failed(link);
+ return;
+ }
+ }
+
+ break;
+ case DHCP_EVENT_IP_ACQUIRE:
+ r = dhcp_lease_acquired(client, link);
+ if (r < 0) {
+ link_enter_failed(link);
+ return;
+ }
+ if (link->ipv4ll) {
+ r = sd_ipv4ll_stop(link->ipv4ll);
+ if (r < 0) {
+ link_enter_failed(link);
+ return;
+ }
+ }
+ break;
+ default:
+ if (event < 0)
+ log_warning_link(link, "DHCP error: %s", strerror(-event));
+ else
+ log_warning_link(link, "DHCP unknown event: %d", event);
+ break;
+ }
+
+ return;
+}
+
+static int ipv4ll_address_lost(sd_ipv4ll *ll, Link *link) {
+ int r;
+ struct in_addr addr;
+
+ assert(ll);
+ assert(link);
+
+ r = sd_ipv4ll_get_address(link->ipv4ll, &addr);
+ if (r >= 0) {
+ _cleanup_address_free_ Address *address = NULL;
+ _cleanup_route_free_ Route *route = NULL;
+
+ log_debug_link(link, "IPv4 link-local release %u.%u.%u.%u",
+ ADDRESS_FMT_VAL(addr));
+
+ r = address_new_dynamic(&address);
+ if (r < 0) {
+ log_error_link(link, "Could not allocate address: %s", strerror(-r));
+ return r;
+ }
+
+ address->family = AF_INET;
+ address->in_addr.in = addr;
+ address->prefixlen = 16;
+ address->scope = RT_SCOPE_LINK;
+
+ address_drop(address, link, &address_drop_handler);
+
+ r = route_new_dynamic(&route);
+ if (r < 0) {
+ log_error_link(link, "Could not allocate route: %s",
+ strerror(-r));
+ return r;
+ }
+
+ route->family = AF_INET;
+ route->scope = RT_SCOPE_LINK;
+ route->metrics = 99;
+
+ route_drop(route, link, &route_drop_handler);
+ }
+
+ return 0;
+}
+
+static int ipv4ll_address_claimed(sd_ipv4ll *ll, Link *link) {
+ struct in_addr address;
+ int r;
+
+ assert(ll);
+ assert(link);
+
+ r = sd_ipv4ll_get_address(ll, &address);
+ if (r < 0)
+ return r;
+
+ log_struct_link(LOG_INFO, link,
+ "MESSAGE=%s: IPv4 link-local address %u.%u.%u.%u",
+ link->ifname,
+ ADDRESS_FMT_VAL(address),
+ NULL);
+
+ link_enter_set_addresses(link);
+
+ return 0;
+}
+
+static void ipv4ll_handler(sd_ipv4ll *ll, int event, void *userdata){
+ Link *link = userdata;
+ int r;
+
+ assert(link);
+ assert(link->network);
+ assert(link->manager);
+
+ switch(event) {
+ case IPV4LL_EVENT_STOP:
+ case IPV4LL_EVENT_CONFLICT:
+ r = ipv4ll_address_lost(ll, link);
+ if (r < 0) {
+ link_enter_failed(link);
+ return;
+ }
+ break;
+ case IPV4LL_EVENT_BIND:
+ r = ipv4ll_address_claimed(ll, link);
+ if (r < 0) {
+ link_enter_failed(link);
+ return;
+ }
+ break;
+ default:
+ if (event < 0)
+ log_warning_link(link, "IPv4 link-local error: %s", strerror(-event));
+ else
+ log_warning_link(link, "IPv4 link-local unknown event: %d", event);
+ break;
+ }
+}
+
+static int link_acquire_conf(Link *link) {
+ int r;
+
+ assert(link);
+ assert(link->network);
+ assert(link->manager);
+ assert(link->manager->event);
+
+ if (link->network->ipv4ll) {
+ if (!link->ipv4ll) {
+ r = sd_ipv4ll_new(&link->ipv4ll);
+ if (r < 0)
+ return r;
+
+ r = sd_ipv4ll_attach_event(link->ipv4ll, NULL, 0);
+ if (r < 0)
+ return r;
+
+ r = sd_ipv4ll_set_index(link->ipv4ll, link->ifindex);
+ if (r < 0)
+ return r;
+
+ r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
+ if (r < 0)
+ return r;
+
+ r = sd_ipv4ll_set_callback(link->ipv4ll, ipv4ll_handler, link);
+ if (r < 0)
+ return r;
+ }
+
+ log_debug_link(link, "acquiring IPv4 link-local address");
+
+ r = sd_ipv4ll_start(link->ipv4ll);
+ if (r < 0)
+ return r;
+ }
+
+ if (link->network->dhcp) {
+ if (!link->dhcp_client) {
+ r = sd_dhcp_client_new(&link->dhcp_client);
+ if (r < 0)
+ return r;
+
+ r = sd_dhcp_client_attach_event(link->dhcp_client, NULL, 0);
+ if (r < 0)
+ return r;
+
+ r = sd_dhcp_client_set_index(link->dhcp_client, link->ifindex);
+ if (r < 0)
+ return r;
+
+ r = sd_dhcp_client_set_mac(link->dhcp_client, &link->mac);
+ if (r < 0)
+ return r;
+
+ r = sd_dhcp_client_set_callback(link->dhcp_client, dhcp_handler, link);
+ if (r < 0)
+ return r;
+
+ if (link->network->dhcp_mtu) {
+ r = sd_dhcp_client_set_request_option(link->dhcp_client, 26);
+ if (r < 0)
+ return r;
+ }
+ }
+
+ log_debug_link(link, "acquiring DHCPv4 lease");
+
+ r = sd_dhcp_client_start(link->dhcp_client);
+ if (r < 0)
+ return r;
+ }
+
+ 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);
+ return r;
+ }
+
+ link->enslaving ++;
+ }
+
+ if (link->network->bond) {
+ log_struct_link(LOG_DEBUG, link,
+ "MESSAGE=%s: enslaving by '%s'",
+ link->ifname, link->network->bond->name,
+ NETDEV(link->network->bond),
+ NULL);
+
+ r = netdev_enslave(link->network->bond, link, &enslave_handler);
+ if (r < 0) {
+ log_struct_link(LOG_WARNING, link,
+ "MESSAGE=%s: could not enslave by '%s': %s",
+ link->ifname, link->network->bond->name, strerror(-r),
+ NETDEV(link->network->bond),
+ NULL);
+ link_enter_failed(link);
+ return r;
+ }
+
+ link->enslaving ++;
+ }
+
+ HASHMAP_FOREACH(vlan, link->network->vlans, i) {
+ log_struct_link(LOG_DEBUG, link,
+ "MESSAGE=%s: enslaving by '%s'",
+ link->ifname, vlan->name, NETDEV(vlan), NULL);
+
+ r = netdev_enslave(vlan, link, &enslave_handler);
+ if (r < 0) {
+ log_struct_link(LOG_WARNING, link,
+ "MESSAGE=%s: could not enslave by '%s': %s",
+ link->ifname, vlan->name, strerror(-r),
+ NETDEV(vlan), NULL);
+ link_enter_failed(link);
+ return r;
+ }
+
+ link->enslaving ++;
+ }
+
+ HASHMAP_FOREACH(macvlan, link->network->macvlans, i) {
+ log_struct_link(LOG_DEBUG, link,
+ "MESSAGE=%s: enslaving by '%s'",
+ link->ifname, macvlan->name, NETDEV(macvlan), NULL);
+
+ r = netdev_enslave(macvlan, link, &enslave_handler);
+ if (r < 0) {
+ log_struct_link(LOG_WARNING, link,
+ "MESSAGE=%s: could not enslave by '%s': %s",
+ link->ifname, macvlan->name, strerror(-r),
+ NETDEV(macvlan), NULL);
+ link_enter_failed(link);
+ return r;
+ }
+
+ link->enslaving ++;
+ }
+
+ return 0;
+}
+
+static int link_getlink_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_struct_link(LOG_ERR, link,
+ "MESSAGE=%s: could not get state: %s",
+ link->ifname, strerror(-r),
+ "ERRNO=%d", -r,
+ NULL);
+ link_enter_failed(link);
+ return 1;
+ }
+
+ link_update(link, m);
+
+ return 1;
+}
+
+static int link_getlink(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, "requesting link status");
+
+ r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
+ RTM_GETLINK, link->ifindex);
+ if (r < 0) {
+ log_error_link(link, "Could not allocate RTM_GETLINK message");
+ return r;
+ }
+
+ r = sd_rtnl_call_async(link->manager->rtnl, req, link_getlink_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_configure(Link *link) {
+ int r;
+
+ assert(link);
+ assert(link->state == _LINK_STATE_INVALID);
+
+ r = link_getlink(link);
+ if (r < 0)
+ return r;
+
+ return link_enter_enslave(link);
+}
+
+int link_add(Manager *m, struct udev_device *device, Link **ret) {
+ Link *link = NULL;
+ Network *network;
+ int r;
+
+ assert(m);
+ assert(device);
+
+ r = link_new(m, device, &link);
+ if (r < 0)
+ return r;
+
+ *ret = link;
+