+
+int link_set_mtu(Link *link, uint32_t mtu) {
+ _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL;
+ int r;
+
+ assert(link);
+ assert(link->manager);
+ assert(link->manager->rtnl);
+
+ log_debug_link(link, "setting MTU: %" PRIu32, mtu);
+
+ 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_append_u32(req, IFLA_MTU, mtu);
+ if (r < 0) {
+ log_error_link(link, "Could not append MTU: %s", strerror(-r));
+ return r;
+ }
+
+ r = sd_rtnl_call_async(link->manager->rtnl, req, set_mtu_handler, link,
+ 0, NULL);
+ if (r < 0) {
+ log_error_link(link,
+ "Could not send rtnetlink message: %s",
+ strerror(-r));
+ return r;
+ }
+
+ link_ref(link);
+
+ return 0;
+}
+
+static void dhcp6_handler(sd_dhcp6_client *client, int event, void *userdata) {
+ Link *link = userdata;
+
+ assert(link);
+ assert(link->network);
+ assert(link->manager);
+
+ if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
+ return;
+
+ switch(event) {
+ case DHCP6_EVENT_STOP:
+ case DHCP6_EVENT_RESEND_EXPIRE:
+ case DHCP6_EVENT_RETRANS_MAX:
+ case DHCP6_EVENT_IP_ACQUIRE:
+ log_debug_link(link, "DHCPv6 event %d", event);
+
+ break;
+
+ default:
+ if (event < 0)
+ log_warning_link(link, "DHCPv6 error: %s",
+ strerror(-event));
+ else
+ log_warning_link(link, "DHCPv6 unknown event: %d",
+ event);
+ return;
+ }
+}
+
+static void icmp6_router_handler(sd_icmp6_nd *nd, int event, void *userdata) {
+ Link *link = userdata;
+ int r;
+
+ assert(link);
+ assert(link->network);
+ assert(link->manager);
+
+ if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
+ return;
+
+ switch(event) {
+ case ICMP6_EVENT_ROUTER_ADVERTISMENT_NONE:
+ case ICMP6_EVENT_ROUTER_ADVERTISMENT_OTHER:
+ return;
+
+ case ICMP6_EVENT_ROUTER_ADVERTISMENT_TIMEOUT:
+ case ICMP6_EVENT_ROUTER_ADVERTISMENT_MANAGED:
+ break;
+
+ default:
+ if (event < 0)
+ log_warning_link(link, "ICMPv6 error: %s",
+ strerror(-event));
+ else
+ log_warning_link(link, "ICMPv6 unknown event: %d",
+ event);
+
+ return;
+ }
+
+ if (link->dhcp6_client)
+ return;
+
+ r = sd_dhcp6_client_new(&link->dhcp6_client);
+ if (r < 0)
+ return;
+
+ r = sd_dhcp6_client_attach_event(link->dhcp6_client, NULL, 0);
+ if (r < 0) {
+ link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client);
+ return;
+ }
+
+ r = sd_dhcp6_client_set_mac(link->dhcp6_client,
+ (const uint8_t *) &link->mac,
+ sizeof (link->mac), ARPHRD_ETHER);
+ if (r < 0) {
+ link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client);
+ return;
+ }
+
+ r = sd_dhcp6_client_set_index(link->dhcp6_client, link->ifindex);
+ if (r < 0) {
+ link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client);
+ return;
+ }
+
+ r = sd_dhcp6_client_set_callback(link->dhcp6_client, dhcp6_handler,
+ link);
+ if (r < 0) {
+ link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client);
+ return;
+ }
+
+ r = sd_dhcp6_client_start(link->dhcp6_client);
+ if (r < 0)
+ link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client);
+}
+
+static int link_acquire_conf(Link *link) {
+ int r;
+
+ assert(link);
+ assert(link->network);
+ assert(link->manager);
+ assert(link->manager->event);
+
+ if (link_ipv4ll_enabled(link)) {
+ assert(link->ipv4ll);
+
+ log_debug_link(link, "acquiring IPv4 link-local address");
+
+ r = sd_ipv4ll_start(link->ipv4ll);
+ if (r < 0) {
+ log_warning_link(link, "could not acquire IPv4 "
+ "link-local address");
+ return r;
+ }
+ }
+
+ if (link_dhcp4_enabled(link)) {
+ assert(link->dhcp_client);
+
+ log_debug_link(link, "acquiring DHCPv4 lease");
+
+ r = sd_dhcp_client_start(link->dhcp_client);
+ if (r < 0) {
+ log_warning_link(link, "could not acquire DHCPv4 "
+ "lease");
+ return r;
+ }
+ }
+
+ if (link_dhcp6_enabled(link)) {
+ assert(link->icmp6_router_discovery);
+
+ log_debug_link(link, "discovering IPv6 routers");
+
+ r = sd_icmp6_router_solicitation_start(link->icmp6_router_discovery);
+ if (r < 0) {
+ log_warning_link(link,
+ "could not start IPv6 router discovery");
+ return r;
+ }
+ }
+
+ return 0;
+}
+
+bool link_has_carrier(Link *link) {
+ /* see Documentation/networking/operstates.txt in the kernel sources */
+
+ if (link->kernel_operstate == IF_OPER_UP)
+ return true;
+
+ if (link->kernel_operstate == IF_OPER_UNKNOWN)
+ /* operstate may not be implemented, so fall back to flags */
+ if ((link->flags & IFF_LOWER_UP) && !(link->flags & IFF_DORMANT))
+ return true;
+
+ return false;
+}
+
+static int link_up_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
+ _cleanup_link_unref_ Link *link = userdata;
+ int r;
+
+ assert(link);
+
+ if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
+ return 1;
+
+ r = sd_rtnl_message_get_errno(m);
+ if (r < 0) {
+ /* we warn but don't fail the link, as it may
+ be brought up later */
+ log_struct_link(LOG_WARNING, link,
+ "MESSAGE=%-*s: could not bring up interface: %s",
+ IFNAMSIZ,
+ 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;
+ }
+
+ link_ref(link);
+
+ return 0;
+}
+
+static int link_joined(Link *link) {
+ int r;
+
+ assert(link);
+ assert(link->network);
+
+ if (!(link->flags & IFF_UP)) {
+ r = link_up(link);
+ if (r < 0) {
+ link_enter_failed(link);
+ return r;
+ }
+ }
+
+ return link_enter_set_addresses(link);
+}
+
+static int netdev_join_handler(sd_rtnl *rtnl, sd_rtnl_message *m,
+ void *userdata) {
+ _cleanup_link_unref_ Link *link = userdata;
+ int r;
+
+ assert(link);
+ assert(link->network);
+
+ link->enslaving --;
+
+ if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
+ return 1;
+
+ r = sd_rtnl_message_get_errno(m);
+ if (r < 0 && r != -EEXIST) {
+ log_struct_link(LOG_ERR, link,
+ "MESSAGE=%-*s: could not join netdev: %s",
+ IFNAMSIZ,
+ link->ifname, strerror(-r),
+ "ERRNO=%d", -r,
+ NULL);
+ link_enter_failed(link);
+ return 1;
+ } else
+ log_debug_link(link, "joined netdev");
+
+ if (link->enslaving <= 0)
+ link_joined(link);
+
+ return 1;
+}
+
+static int link_enter_join_netdev(Link *link) {
+ NetDev *netdev;
+ Iterator i;
+ int r;
+
+ assert(link);
+ assert(link->network);
+ assert(link->state == LINK_STATE_PENDING);
+
+ link->state = LINK_STATE_ENSLAVING;
+
+ link_save(link);
+
+ if (!link->network->bridge &&
+ !link->network->bond &&
+ hashmap_isempty(link->network->stacked_netdevs))
+ return link_joined(link);
+
+ if (link->network->bond) {
+ log_struct_link(LOG_DEBUG, link,
+ "MESSAGE=%-*s: enslaving by '%s'",
+ IFNAMSIZ,
+ link->ifname, link->network->bond->ifname,
+ NETDEVIF(link->network->bond),
+ NULL);
+
+ r = netdev_join(link->network->bond, link, &netdev_join_handler);
+ if (r < 0) {
+ log_struct_link(LOG_WARNING, link,
+ "MESSAGE=%-*s: could not join netdev '%s': %s",
+ IFNAMSIZ,
+ link->ifname, link->network->bond->ifname,
+ strerror(-r),
+ NETDEVIF(link->network->bond),
+ NULL);
+ link_enter_failed(link);
+ return r;
+ }
+
+ link->enslaving ++;
+ }
+
+ if (link->network->bridge) {
+ log_struct_link(LOG_DEBUG, link,
+ "MESSAGE=%-*s: enslaving by '%s'",
+ IFNAMSIZ,
+ link->ifname, link->network->bridge->ifname,
+ NETDEVIF(link->network->bridge),
+ NULL);
+
+ r = netdev_join(link->network->bridge, link,
+ &netdev_join_handler);
+ if (r < 0) {
+ log_struct_link(LOG_WARNING, link,
+ "MESSAGE=%-*s: could not join netdev '%s': %s",
+ IFNAMSIZ,
+ link->ifname, link->network->bridge->ifname,
+ strerror(-r),
+ NETDEVIF(link->network->bridge),
+ NULL);
+ link_enter_failed(link);
+ return r;
+ }
+
+ link->enslaving ++;
+ }
+
+ HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
+ log_struct_link(LOG_DEBUG, link,
+ "MESSAGE=%-*s: enslaving by '%s'",
+ IFNAMSIZ,
+ link->ifname, netdev->ifname, NETDEVIF(netdev),
+ NULL);
+
+ r = netdev_join(netdev, link, &netdev_join_handler);
+ if (r < 0) {
+ log_struct_link(LOG_WARNING, link,
+ "MESSAGE=%-*s: could not join netdev '%s': %s",
+ IFNAMSIZ,
+ link->ifname, netdev->ifname,
+ strerror(-r),
+ NETDEVIF(netdev), NULL);
+ link_enter_failed(link);
+ return r;
+ }
+
+ link->enslaving ++;
+ }
+
+ return 0;
+}
+
+static int link_configure(Link *link) {
+ int r;
+
+ assert(link);
+ assert(link->network);
+ assert(link->state == LINK_STATE_PENDING);
+
+ if (link_ipv4ll_enabled(link)) {
+ r = ipv4ll_configure(link);
+ if (r < 0)
+ return r;
+ }
+
+ if (link_dhcp4_enabled(link)) {
+ r = dhcp4_configure(link);
+ if (r < 0)
+ return r;
+ }
+
+ if (link_dhcp4_server_enabled(link)) {
+ r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
+ if (r < 0)
+ return r;
+
+ r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
+ if (r < 0)
+ return r;
+ }
+
+ if (link_dhcp6_enabled(link)) {
+ r = sd_icmp6_nd_new(&link->icmp6_router_discovery);
+ if (r < 0)
+ return r;
+
+ r = sd_icmp6_nd_attach_event(link->icmp6_router_discovery,
+ NULL, 0);
+ if (r < 0)
+ return r;
+
+ r = sd_icmp6_nd_set_mac(link->icmp6_router_discovery,
+ &link->mac);
+ if (r < 0)
+ return r;
+
+ r = sd_icmp6_nd_set_index(link->icmp6_router_discovery,
+ link->ifindex);
+ if (r < 0)
+ return r;
+
+ r = sd_icmp6_nd_set_callback(link->icmp6_router_discovery,
+ icmp6_router_handler, link);
+ if (r < 0)
+ return r;
+ }
+
+ if (link_has_carrier(link)) {
+ r = link_acquire_conf(link);
+ if (r < 0)
+ return r;
+ }
+
+ return link_enter_join_netdev(link);
+}
+
+static int link_initialized_and_synced(sd_rtnl *rtnl, sd_rtnl_message *m,
+ void *userdata) {
+ _cleanup_link_unref_ Link *link = userdata;
+ Network *network;
+ int r;
+
+ assert(link);
+ assert(link->ifname);
+ assert(link->manager);
+
+ if (link->state != LINK_STATE_PENDING)
+ return 1;
+
+ log_debug_link(link, "link state is up-to-date");
+
+ r = network_get(link->manager, link->udev_device, link->ifname,
+ &link->mac, &network);
+ if (r == -ENOENT) {
+ link_enter_unmanaged(link);
+ return 1;
+ } else if (r < 0)
+ return r;
+
+ if (link->flags & IFF_LOOPBACK) {
+ if (network->ipv4ll)
+ log_debug_link(link, "ignoring IPv4LL for loopback link");
+
+ if (network->dhcp != DHCP_SUPPORT_NONE)
+ log_debug_link(link, "ignoring DHCP clients for loopback link");
+
+ if (network->dhcp_server)
+ log_debug_link(link, "ignoring DHCP server for loopback link");
+ }
+
+ r = network_apply(link->manager, network, link);
+ if (r < 0)
+ return r;
+
+ r = link_configure(link);
+ if (r < 0)
+ return r;
+
+ return 1;
+}
+
+int link_initialized(Link *link, struct udev_device *device) {
+ _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL;
+ int r;
+
+ assert(link);
+ assert(link->manager);
+ assert(link->manager->rtnl);
+ assert(device);
+
+ if (link->state != LINK_STATE_PENDING)
+ return 0;
+
+ if (link->udev_device)
+ return 0;
+
+ log_debug_link(link, "udev initialized link");
+
+ link->udev_device = udev_device_ref(device);
+
+ /* udev has initialized the link, but we don't know if we have yet
+ * processed the NEWLINK messages with the latest state. Do a GETLINK,
+ * when it returns we know that the pending NEWLINKs have already been
+ * processed and that we are up-to-date */
+
+ r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
+ link->ifindex);
+ if (r < 0)
+ return r;
+
+ r = sd_rtnl_call_async(link->manager->rtnl, req,
+ link_initialized_and_synced, link, 0, NULL);
+ if (r < 0)
+ return r;
+
+ link_ref(link);
+
+ return 0;
+}
+
+int link_rtnl_process_address(sd_rtnl *rtnl, sd_rtnl_message *message,
+ void *userdata) {
+ Manager *m = userdata;
+ Link *link = NULL;
+ uint16_t type;
+ _cleanup_address_free_ Address *address = NULL;
+ Address *ad;
+ char buf[INET6_ADDRSTRLEN];
+ char valid_buf[FORMAT_TIMESPAN_MAX];
+ const char *valid_str = NULL;
+ bool address_dropped = false;
+ int r, ifindex;
+
+ assert(rtnl);
+ assert(message);
+ assert(m);
+
+ r = sd_rtnl_message_get_type(message, &type);
+ if (r < 0) {
+ log_warning("rtnl: could not get message type");
+ return 0;
+ }
+
+ r = sd_rtnl_message_addr_get_ifindex(message, &ifindex);
+ if (r < 0 || ifindex <= 0) {
+ log_warning("rtnl: received address message without valid ifindex, ignoring");
+ return 0;
+ } else {
+ r = link_get(m, ifindex, &link);
+ if (r < 0 || !link) {
+ log_warning("rtnl: received address for a nonexistent link (%d), ignoring", ifindex);
+ return 0;
+ }
+ }
+
+ r = address_new_dynamic(&address);
+ if (r < 0)
+ return r;
+
+ r = sd_rtnl_message_addr_get_family(message, &address->family);
+ if (r < 0 || !IN_SET(address->family, AF_INET, AF_INET6)) {
+ log_warning_link(link,
+ "rtnl: received address with invalid family, ignoring");
+ return 0;
+ }
+
+ r = sd_rtnl_message_addr_get_prefixlen(message, &address->prefixlen);
+ if (r < 0) {
+ log_warning_link(link,
+ "rtnl: received address with invalid prefixlen, ignoring");
+ return 0;
+ }
+
+ r = sd_rtnl_message_addr_get_scope(message, &address->scope);
+ if (r < 0) {
+ log_warning_link(link,
+ "rtnl: received address with invalid scope, ignoring");
+ return 0;
+ }
+
+ r = sd_rtnl_message_addr_get_flags(message, &address->flags);
+ if (r < 0) {
+ log_warning_link(link,
+ "rtnl: received address with invalid flags, ignoring");
+ return 0;
+ }
+
+ switch (address->family) {
+ case AF_INET:
+ r = sd_rtnl_message_read_in_addr(message, IFA_LOCAL,
+ &address->in_addr.in);
+ if (r < 0) {
+ log_warning_link(link,
+ "rtnl: received address without valid address, ignoring");
+ return 0;
+ }
+
+ break;
+
+ case AF_INET6:
+ r = sd_rtnl_message_read_in6_addr(message, IFA_ADDRESS,
+ &address->in_addr.in6);
+ if (r < 0) {
+ log_warning_link(link,
+ "rtnl: received address without valid address, ignoring");
+ return 0;
+ }
+
+ break;
+
+ default:
+ assert_not_reached("invalid address family");
+ }
+
+ if (!inet_ntop(address->family, &address->in_addr, buf,
+ INET6_ADDRSTRLEN)) {
+ log_warning_link(link, "could not print address");
+ return 0;
+ }
+
+ r = sd_rtnl_message_read_cache_info(message, IFA_CACHEINFO,
+ &address->cinfo);
+ if (r >= 0) {
+ if (address->cinfo.ifa_valid == CACHE_INFO_INFINITY_LIFE_TIME)
+ valid_str = "ever";
+ else
+ valid_str = format_timespan(valid_buf, FORMAT_TIMESPAN_MAX,
+ address->cinfo.ifa_valid * USEC_PER_SEC,
+ USEC_PER_SEC);
+ }
+
+ LIST_FOREACH(addresses, ad, link->addresses) {
+ if (address_equal(ad, address)) {
+ LIST_REMOVE(addresses, link->addresses, ad);
+
+ address_free(ad);
+
+ address_dropped = true;
+
+ break;
+ }
+ }
+
+ switch (type) {
+ case RTM_NEWADDR:
+ if (!address_dropped)
+ log_debug_link(link, "added address: %s/%u (valid for %s)",
+ buf, address->prefixlen, valid_str);
+ else
+ log_debug_link(link, "updated address: %s/%u (valid for %s)",
+ buf, address->prefixlen, valid_str);
+
+ LIST_PREPEND(addresses, link->addresses, address);
+ address = NULL;
+
+ link_save(link);
+
+ break;
+ case RTM_DELADDR:
+ if (address_dropped) {
+ log_debug_link(link, "removed address: %s/%u (valid for %s)",
+ buf, address->prefixlen, valid_str);
+
+ link_save(link);
+ } else
+ log_warning_link(link,
+ "removing non-existent address: %s/%u (valid for %s)",
+ buf, address->prefixlen, valid_str);
+
+ break;
+ default:
+ assert_not_reached("Received invalid RTNL message type");
+ }
+
+ return 1;
+}
+
+int link_add(Manager *m, sd_rtnl_message *message, Link **ret) {
+ Link *link;
+ _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL;
+ _cleanup_udev_device_unref_ struct udev_device *device = NULL;
+ char ifindex_str[2 + DECIMAL_STR_MAX(int)];
+ int r;
+
+ assert(m);
+ assert(m->rtnl);
+ assert(message);
+ assert(ret);
+
+ r = link_new(m, message, ret);
+ if (r < 0)
+ return r;
+
+ link = *ret;
+
+ log_debug_link(link, "link %d added", link->ifindex);
+
+ r = sd_rtnl_message_new_addr(m->rtnl, &req, RTM_GETADDR, link->ifindex,
+ 0);
+ if (r < 0)
+ return r;
+
+ r = sd_rtnl_call_async(m->rtnl, req, link_get_address_handler, link, 0,
+ NULL);
+ if (r < 0)
+ return r;
+
+ link_ref(link);
+
+ if (detect_container(NULL) <= 0) {
+ /* not in a container, udev will be around */
+ sprintf(ifindex_str, "n%d", link->ifindex);
+ device = udev_device_new_from_device_id(m->udev, ifindex_str);
+ if (!device) {
+ log_warning_link(link,
+ "could not find udev device: %m");
+ return -errno;
+ }
+
+ if (udev_device_get_is_initialized(device) <= 0) {
+ /* not yet ready */
+ log_debug_link(link, "link pending udev initialization...");
+ return 0;
+ }
+
+ r = link_initialized(link, device);
+ if (r < 0)
+ return r;
+ } else {
+ /* we are calling a callback directly, so must take a ref */
+ link_ref(link);
+
+ r = link_initialized_and_synced(m->rtnl, NULL, link);
+ if (r < 0)
+ return r;
+ }
+
+ return 0;
+}
+
+int link_update(Link *link, sd_rtnl_message *m) {
+ struct ether_addr mac;
+ const char *ifname;
+ uint32_t mtu;
+ bool had_carrier, carrier_gained, carrier_lost;
+ int r;
+
+ assert(link);
+ assert(link->ifname);
+ assert(m);
+
+ if (link->state == LINK_STATE_LINGER) {
+ link_ref(link);
+ log_info_link(link, "link readded");
+ link->state = LINK_STATE_ENSLAVING;
+ }
+
+ r = sd_rtnl_message_read_string(m, IFLA_IFNAME, &ifname);
+ if (r >= 0 && !streq(ifname, link->ifname)) {
+ log_info_link(link, "renamed to %s", ifname);
+
+ free(link->ifname);
+ link->ifname = strdup(ifname);
+ if (!link->ifname)
+ return -ENOMEM;
+ }
+
+ r = sd_rtnl_message_read_u32(m, IFLA_MTU, &mtu);
+ if (r >= 0 && mtu > 0) {
+ link->mtu = mtu;
+ if (!link->original_mtu) {
+ link->original_mtu = mtu;
+ log_debug_link(link, "saved original MTU: %"
+ PRIu32, link->original_mtu);
+ }
+
+ if (link->dhcp_client) {
+ r = sd_dhcp_client_set_mtu(link->dhcp_client,
+ link->mtu);
+ if (r < 0) {
+ log_warning_link(link,
+ "Could not update MTU in DHCP client: %s",
+ strerror(-r));
+ return r;
+ }
+ }
+ }
+
+ /* The kernel may broadcast NEWLINK messages without the MAC address
+ set, simply ignore them. */
+ r = sd_rtnl_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
+ if (r >= 0) {
+ if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
+ ETH_ALEN)) {
+
+ memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
+ ETH_ALEN);
+
+ log_debug_link(link, "MAC address: "
+ "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
+ mac.ether_addr_octet[0],
+ mac.ether_addr_octet[1],
+ mac.ether_addr_octet[2],
+ mac.ether_addr_octet[3],
+ mac.ether_addr_octet[4],
+ mac.ether_addr_octet[5]);
+
+ if (link->ipv4ll) {
+ r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
+ if (r < 0) {
+ log_warning_link(link,
+ "Could not update MAC address in IPv4LL client: %s",
+ strerror(-r));
+ return r;
+ }
+ }
+
+ if (link->dhcp_client) {
+ r = sd_dhcp_client_set_mac(link->dhcp_client,
+ (const uint8_t *) &link->mac,
+ sizeof (link->mac),
+ ARPHRD_ETHER);
+ if (r < 0) {
+ log_warning_link(link,
+ "Could not update MAC address in DHCP client: %s",
+ strerror(-r));
+ return r;
+ }
+ }
+
+ if (link->dhcp6_client) {
+ r = sd_dhcp6_client_set_mac(link->dhcp6_client,
+ (const uint8_t *) &link->mac,
+ sizeof (link->mac),
+ ARPHRD_ETHER);
+ if (r < 0) {
+ log_warning_link(link,
+ "Could not update MAC address in DHCPv6 client: %s",
+ strerror(-r));
+ return r;
+ }
+ }
+ }
+ }
+
+ had_carrier = link_has_carrier(link);
+
+ r = link_update_flags(link, m);
+ if (r < 0)
+ return r;
+
+ carrier_gained = !had_carrier && link_has_carrier(link);
+ carrier_lost = had_carrier && !link_has_carrier(link);
+
+ if (carrier_gained) {
+ log_info_link(link, "gained carrier");
+
+ if (link->network) {
+ r = link_acquire_conf(link);
+ if (r < 0) {
+ link_enter_failed(link);
+ return r;
+ }
+ }
+ } else if (carrier_lost) {
+ log_info_link(link, "lost carrier");
+
+ r = link_stop_clients(link);
+ if (r < 0) {
+ link_enter_failed(link);
+ return r;
+ }
+ }
+
+ return 0;
+}
+
+static void link_update_operstate(Link *link) {
+
+ assert(link);
+
+ if (link->kernel_operstate == IF_OPER_DORMANT)
+ link->operstate = LINK_OPERSTATE_DORMANT;
+ else if (link_has_carrier(link)) {
+ Address *address;
+ uint8_t scope = RT_SCOPE_NOWHERE;
+
+ /* if we have carrier, check what addresses we have */
+ LIST_FOREACH(addresses, address, link->addresses) {
+ if (address->flags & (IFA_F_TENTATIVE | IFA_F_DEPRECATED))
+ continue;
+
+ if (address->scope < scope)
+ scope = address->scope;
+ }
+
+ if (scope < RT_SCOPE_SITE)
+ /* universally accessible addresses found */
+ link->operstate = LINK_OPERSTATE_ROUTABLE;
+ else if (scope < RT_SCOPE_HOST)
+ /* only link or site local addresses found */
+ link->operstate = LINK_OPERSTATE_DEGRADED;
+ else
+ /* no useful addresses found */
+ link->operstate = LINK_OPERSTATE_CARRIER;
+ } else if (link->flags & IFF_UP)
+ link->operstate = LINK_OPERSTATE_NO_CARRIER;
+ else
+ link->operstate = LINK_OPERSTATE_OFF;
+}
+
+int link_save(Link *link) {
+ _cleanup_free_ char *temp_path = NULL;
+ _cleanup_fclose_ FILE *f = NULL;
+ const char *admin_state, *oper_state;
+ int r;
+
+ assert(link);
+ assert(link->state_file);
+ assert(link->lease_file);
+ assert(link->manager);
+
+ link_update_operstate(link);
+
+ r = manager_save(link->manager);
+ if (r < 0)
+ return r;
+
+ if (link->state == LINK_STATE_LINGER) {
+ unlink(link->state_file);
+ return 0;
+ }
+
+ admin_state = link_state_to_string(link->state);
+ assert(admin_state);
+
+ oper_state = link_operstate_to_string(link->operstate);
+ assert(oper_state);
+
+ r = fopen_temporary(link->state_file, &f, &temp_path);
+ if (r < 0)
+ return r;
+
+ fchmod(fileno(f), 0644);
+
+ fprintf(f,
+ "# This is private data. Do not parse.\n"
+ "ADMIN_STATE=%s\n"
+ "OPER_STATE=%s\n",
+ admin_state, oper_state);
+
+ if (link->network) {
+ char **address, **domain;
+ bool space;
+
+ fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
+
+ fputs("DNS=", f);
+ space = false;
+ STRV_FOREACH(address, link->network->dns) {
+ if (space)
+ fputc(' ', f);
+ fputs(*address, f);
+ space = true;
+ }
+
+ if (link->network->dhcp_dns &&
+ link->dhcp_lease) {
+ const struct in_addr *addresses;
+
+ r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
+ if (r > 0) {
+ if (space)
+ fputc(' ', f);
+ serialize_in_addrs(f, addresses, r);
+ }
+ }
+
+ fputs("\n", f);
+
+ fprintf(f, "NTP=");
+ space = false;
+ STRV_FOREACH(address, link->network->ntp) {
+ if (space)
+ fputc(' ', f);
+ fputs(*address, f);
+ space = true;
+ }
+
+ if (link->network->dhcp_ntp &&
+ link->dhcp_lease) {
+ const struct in_addr *addresses;
+
+ r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
+ if (r > 0) {
+ if (space)
+ fputc(' ', f);
+ serialize_in_addrs(f, addresses, r);
+ }
+ }
+
+ fputs("\n", f);
+
+ fprintf(f, "DOMAINS=");
+ space = false;
+ STRV_FOREACH(domain, link->network->domains) {
+ if (space)
+ fputc(' ', f);
+ fputs(*domain, f);
+ space = true;
+ }
+
+ if (link->network->dhcp_domains &&
+ link->dhcp_lease) {
+ const char *domainname;
+
+ r = sd_dhcp_lease_get_domainname(link->dhcp_lease, &domainname);
+ if (r >= 0) {
+ if (space)
+ fputc(' ', f);
+ fputs(domainname, f);
+ }
+ }
+
+ fputs("\n", f);
+
+ fprintf(f, "WILDCARD_DOMAIN=%s\n",
+ yes_no(link->network->wildcard_domain));
+
+ fprintf(f, "LLMNR=%s\n",
+ llmnr_support_to_string(link->network->llmnr));
+ }
+
+ if (link->dhcp_lease) {
+ assert(link->network);
+
+ r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
+ if (r < 0)
+ goto fail;
+
+ fprintf(f,
+ "DHCP_LEASE=%s\n",
+ link->lease_file);
+ } else
+ unlink(link->lease_file);
+
+ r = fflush_and_check(f);
+ if (r < 0)
+ goto fail;
+
+ if (rename(temp_path, link->state_file) < 0) {
+ r = -errno;
+ goto fail;
+ }
+
+ return 0;
+fail:
+ log_error_link(link, "Failed to save link data to %s: %s", link->state_file, strerror(-r));
+ unlink(link->state_file);
+ unlink(temp_path);
+ return r;
+}
+
+static const char* const link_state_table[_LINK_STATE_MAX] = {
+ [LINK_STATE_PENDING] = "pending",
+ [LINK_STATE_ENSLAVING] = "configuring",
+ [LINK_STATE_SETTING_ADDRESSES] = "configuring",
+ [LINK_STATE_SETTING_ROUTES] = "configuring",
+ [LINK_STATE_CONFIGURED] = "configured",
+ [LINK_STATE_UNMANAGED] = "unmanaged",
+ [LINK_STATE_FAILED] = "failed",
+ [LINK_STATE_LINGER] = "linger",
+};
+
+DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
+
+static const char* const link_operstate_table[_LINK_OPERSTATE_MAX] = {
+ [LINK_OPERSTATE_OFF] = "off",
+ [LINK_OPERSTATE_NO_CARRIER] = "no-carrier",
+ [LINK_OPERSTATE_DORMANT] = "dormant",
+ [LINK_OPERSTATE_CARRIER] = "carrier",
+ [LINK_OPERSTATE_DEGRADED] = "degraded",
+ [LINK_OPERSTATE_ROUTABLE] = "routable",
+};
+
+DEFINE_STRING_TABLE_LOOKUP(link_operstate, LinkOperationalState);