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-rw-r--r--src/network/netdev/netdev.c957
1 files changed, 957 insertions, 0 deletions
diff --git a/src/network/netdev/netdev.c b/src/network/netdev/netdev.c
new file mode 100644
index 0000000..57127a8
--- /dev/null
+++ b/src/network/netdev/netdev.c
@@ -0,0 +1,957 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <net/if.h>
+#include <netinet/in.h>
+#include <linux/if_arp.h>
+#include <unistd.h>
+
+#include "alloc-util.h"
+#include "arphrd-util.h"
+#include "bareudp.h"
+#include "batadv.h"
+#include "bond.h"
+#include "bridge.h"
+#include "conf-files.h"
+#include "conf-parser.h"
+#include "dummy.h"
+#include "fd-util.h"
+#include "fou-tunnel.h"
+#include "geneve.h"
+#include "ifb.h"
+#include "ipoib.h"
+#include "ipvlan.h"
+#include "l2tp-tunnel.h"
+#include "list.h"
+#include "macsec.h"
+#include "macvlan.h"
+#include "netdev.h"
+#include "netdevsim.h"
+#include "netif-util.h"
+#include "netlink-util.h"
+#include "networkd-manager.h"
+#include "networkd-queue.h"
+#include "networkd-setlink.h"
+#include "networkd-sriov.h"
+#include "nlmon.h"
+#include "path-lookup.h"
+#include "siphash24.h"
+#include "stat-util.h"
+#include "string-table.h"
+#include "string-util.h"
+#include "strv.h"
+#include "tunnel.h"
+#include "tuntap.h"
+#include "vcan.h"
+#include "veth.h"
+#include "vlan.h"
+#include "vrf.h"
+#include "vxcan.h"
+#include "vxlan.h"
+#include "wireguard.h"
+#include "wlan.h"
+#include "xfrm.h"
+
+const NetDevVTable * const netdev_vtable[_NETDEV_KIND_MAX] = {
+ [NETDEV_KIND_BAREUDP] = &bare_udp_vtable,
+ [NETDEV_KIND_BATADV] = &batadv_vtable,
+ [NETDEV_KIND_BOND] = &bond_vtable,
+ [NETDEV_KIND_BRIDGE] = &bridge_vtable,
+ [NETDEV_KIND_DUMMY] = &dummy_vtable,
+ [NETDEV_KIND_ERSPAN] = &erspan_vtable,
+ [NETDEV_KIND_FOU] = &foutnl_vtable,
+ [NETDEV_KIND_GENEVE] = &geneve_vtable,
+ [NETDEV_KIND_GRE] = &gre_vtable,
+ [NETDEV_KIND_GRETAP] = &gretap_vtable,
+ [NETDEV_KIND_IFB] = &ifb_vtable,
+ [NETDEV_KIND_IP6GRE] = &ip6gre_vtable,
+ [NETDEV_KIND_IP6GRETAP] = &ip6gretap_vtable,
+ [NETDEV_KIND_IP6TNL] = &ip6tnl_vtable,
+ [NETDEV_KIND_IPIP] = &ipip_vtable,
+ [NETDEV_KIND_IPOIB] = &ipoib_vtable,
+ [NETDEV_KIND_IPVLAN] = &ipvlan_vtable,
+ [NETDEV_KIND_IPVTAP] = &ipvtap_vtable,
+ [NETDEV_KIND_L2TP] = &l2tptnl_vtable,
+ [NETDEV_KIND_MACSEC] = &macsec_vtable,
+ [NETDEV_KIND_MACVLAN] = &macvlan_vtable,
+ [NETDEV_KIND_MACVTAP] = &macvtap_vtable,
+ [NETDEV_KIND_NETDEVSIM] = &netdevsim_vtable,
+ [NETDEV_KIND_NLMON] = &nlmon_vtable,
+ [NETDEV_KIND_SIT] = &sit_vtable,
+ [NETDEV_KIND_TAP] = &tap_vtable,
+ [NETDEV_KIND_TUN] = &tun_vtable,
+ [NETDEV_KIND_VCAN] = &vcan_vtable,
+ [NETDEV_KIND_VETH] = &veth_vtable,
+ [NETDEV_KIND_VLAN] = &vlan_vtable,
+ [NETDEV_KIND_VRF] = &vrf_vtable,
+ [NETDEV_KIND_VTI6] = &vti6_vtable,
+ [NETDEV_KIND_VTI] = &vti_vtable,
+ [NETDEV_KIND_VXCAN] = &vxcan_vtable,
+ [NETDEV_KIND_VXLAN] = &vxlan_vtable,
+ [NETDEV_KIND_WIREGUARD] = &wireguard_vtable,
+ [NETDEV_KIND_WLAN] = &wlan_vtable,
+ [NETDEV_KIND_XFRM] = &xfrm_vtable,
+};
+
+static const char* const netdev_kind_table[_NETDEV_KIND_MAX] = {
+ [NETDEV_KIND_BAREUDP] = "bareudp",
+ [NETDEV_KIND_BATADV] = "batadv",
+ [NETDEV_KIND_BOND] = "bond",
+ [NETDEV_KIND_BRIDGE] = "bridge",
+ [NETDEV_KIND_DUMMY] = "dummy",
+ [NETDEV_KIND_ERSPAN] = "erspan",
+ [NETDEV_KIND_FOU] = "fou",
+ [NETDEV_KIND_GENEVE] = "geneve",
+ [NETDEV_KIND_GRE] = "gre",
+ [NETDEV_KIND_GRETAP] = "gretap",
+ [NETDEV_KIND_IFB] = "ifb",
+ [NETDEV_KIND_IP6GRE] = "ip6gre",
+ [NETDEV_KIND_IP6GRETAP] = "ip6gretap",
+ [NETDEV_KIND_IP6TNL] = "ip6tnl",
+ [NETDEV_KIND_IPIP] = "ipip",
+ [NETDEV_KIND_IPOIB] = "ipoib",
+ [NETDEV_KIND_IPVLAN] = "ipvlan",
+ [NETDEV_KIND_IPVTAP] = "ipvtap",
+ [NETDEV_KIND_L2TP] = "l2tp",
+ [NETDEV_KIND_MACSEC] = "macsec",
+ [NETDEV_KIND_MACVLAN] = "macvlan",
+ [NETDEV_KIND_MACVTAP] = "macvtap",
+ [NETDEV_KIND_NETDEVSIM] = "netdevsim",
+ [NETDEV_KIND_NLMON] = "nlmon",
+ [NETDEV_KIND_SIT] = "sit",
+ [NETDEV_KIND_TAP] = "tap",
+ [NETDEV_KIND_TUN] = "tun",
+ [NETDEV_KIND_VCAN] = "vcan",
+ [NETDEV_KIND_VETH] = "veth",
+ [NETDEV_KIND_VLAN] = "vlan",
+ [NETDEV_KIND_VRF] = "vrf",
+ [NETDEV_KIND_VTI6] = "vti6",
+ [NETDEV_KIND_VTI] = "vti",
+ [NETDEV_KIND_VXCAN] = "vxcan",
+ [NETDEV_KIND_VXLAN] = "vxlan",
+ [NETDEV_KIND_WIREGUARD] = "wireguard",
+ [NETDEV_KIND_WLAN] = "wlan",
+ [NETDEV_KIND_XFRM] = "xfrm",
+};
+
+DEFINE_STRING_TABLE_LOOKUP(netdev_kind, NetDevKind);
+
+bool netdev_is_managed(NetDev *netdev) {
+ if (!netdev || !netdev->manager || !netdev->ifname)
+ return false;
+
+ return hashmap_get(netdev->manager->netdevs, netdev->ifname) == netdev;
+}
+
+static bool netdev_is_stacked_and_independent(NetDev *netdev) {
+ assert(netdev);
+
+ if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED)
+ return false;
+
+ switch (netdev->kind) {
+ case NETDEV_KIND_ERSPAN:
+ return ERSPAN(netdev)->independent;
+ case NETDEV_KIND_GRE:
+ return GRE(netdev)->independent;
+ case NETDEV_KIND_GRETAP:
+ return GRETAP(netdev)->independent;
+ case NETDEV_KIND_IP6GRE:
+ return IP6GRE(netdev)->independent;
+ case NETDEV_KIND_IP6GRETAP:
+ return IP6GRETAP(netdev)->independent;
+ case NETDEV_KIND_IP6TNL:
+ return IP6TNL(netdev)->independent;
+ case NETDEV_KIND_IPIP:
+ return IPIP(netdev)->independent;
+ case NETDEV_KIND_SIT:
+ return SIT(netdev)->independent;
+ case NETDEV_KIND_VTI:
+ return VTI(netdev)->independent;
+ case NETDEV_KIND_VTI6:
+ return VTI6(netdev)->independent;
+ case NETDEV_KIND_VXLAN:
+ return VXLAN(netdev)->independent;
+ case NETDEV_KIND_XFRM:
+ return XFRM(netdev)->independent;
+ default:
+ return false;
+ }
+}
+
+static bool netdev_is_stacked(NetDev *netdev) {
+ assert(netdev);
+
+ if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED)
+ return false;
+
+ if (netdev_is_stacked_and_independent(netdev))
+ return false;
+
+ return true;
+}
+
+static void netdev_detach_from_manager(NetDev *netdev) {
+ if (netdev->ifname && netdev->manager)
+ hashmap_remove(netdev->manager->netdevs, netdev->ifname);
+}
+
+static NetDev *netdev_free(NetDev *netdev) {
+ assert(netdev);
+
+ netdev_detach_from_manager(netdev);
+
+ free(netdev->filename);
+
+ free(netdev->description);
+ free(netdev->ifname);
+ condition_free_list(netdev->conditions);
+
+ /* Invoke the per-kind done() destructor, but only if the state field is initialized. We conditionalize that
+ * because we parse .netdev files twice: once to determine the kind (with a short, minimal NetDev structure
+ * allocation, with no room for per-kind fields), and once to read the kind's properties (with a full,
+ * comprehensive NetDev structure allocation with enough space for whatever the specific kind needs). Now, in
+ * the first case we shouldn't try to destruct the per-kind NetDev fields on destruction, in the second case we
+ * should. We use the state field to discern the two cases: it's _NETDEV_STATE_INVALID on the first "raw"
+ * call. */
+ if (netdev->state != _NETDEV_STATE_INVALID &&
+ NETDEV_VTABLE(netdev) &&
+ NETDEV_VTABLE(netdev)->done)
+ NETDEV_VTABLE(netdev)->done(netdev);
+
+ return mfree(netdev);
+}
+
+DEFINE_TRIVIAL_REF_UNREF_FUNC(NetDev, netdev, netdev_free);
+
+void netdev_drop(NetDev *netdev) {
+ if (!netdev)
+ return;
+
+ if (netdev_is_stacked(netdev)) {
+ /* The netdev may be removed due to the underlying device removal, and the device may
+ * be re-added later. */
+ netdev->state = NETDEV_STATE_LOADING;
+ netdev->ifindex = 0;
+
+ log_netdev_debug(netdev, "netdev removed");
+ return;
+ }
+
+ if (NETDEV_VTABLE(netdev) && NETDEV_VTABLE(netdev)->drop)
+ NETDEV_VTABLE(netdev)->drop(netdev);
+
+ netdev->state = NETDEV_STATE_LINGER;
+
+ log_netdev_debug(netdev, "netdev removed");
+
+ netdev_detach_from_manager(netdev);
+ netdev_unref(netdev);
+ return;
+}
+
+int netdev_get(Manager *manager, const char *name, NetDev **ret) {
+ NetDev *netdev;
+
+ assert(manager);
+ assert(name);
+ assert(ret);
+
+ netdev = hashmap_get(manager->netdevs, name);
+ if (!netdev)
+ return -ENOENT;
+
+ *ret = netdev;
+
+ return 0;
+}
+
+void netdev_enter_failed(NetDev *netdev) {
+ netdev->state = NETDEV_STATE_FAILED;
+}
+
+static int netdev_enter_ready(NetDev *netdev) {
+ assert(netdev);
+ assert(netdev->ifname);
+
+ if (netdev->state != NETDEV_STATE_CREATING)
+ return 0;
+
+ netdev->state = NETDEV_STATE_READY;
+
+ log_netdev_info(netdev, "netdev ready");
+
+ if (NETDEV_VTABLE(netdev)->post_create)
+ NETDEV_VTABLE(netdev)->post_create(netdev, NULL);
+
+ return 0;
+}
+
+/* callback for netdev's created without a backing Link */
+static int netdev_create_handler(sd_netlink *rtnl, sd_netlink_message *m, NetDev *netdev) {
+ int r;
+
+ assert(netdev);
+ assert(netdev->state != _NETDEV_STATE_INVALID);
+
+ r = sd_netlink_message_get_errno(m);
+ if (r == -EEXIST)
+ log_netdev_info(netdev, "netdev exists, using existing without changing its parameters");
+ else if (r < 0) {
+ log_netdev_warning_errno(netdev, r, "netdev could not be created: %m");
+ netdev_enter_failed(netdev);
+
+ return 1;
+ }
+
+ log_netdev_debug(netdev, "Created");
+
+ return 1;
+}
+
+int netdev_set_ifindex(NetDev *netdev, sd_netlink_message *message) {
+ uint16_t type;
+ const char *kind;
+ const char *received_kind;
+ const char *received_name;
+ int r, ifindex;
+
+ assert(netdev);
+ assert(message);
+
+ r = sd_netlink_message_get_type(message, &type);
+ if (r < 0)
+ return log_netdev_error_errno(netdev, r, "Could not get rtnl message type: %m");
+
+ if (type != RTM_NEWLINK)
+ return log_netdev_error_errno(netdev, SYNTHETIC_ERRNO(EINVAL), "Cannot set ifindex from unexpected rtnl message type.");
+
+ r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
+ if (r < 0) {
+ log_netdev_error_errno(netdev, r, "Could not get ifindex: %m");
+ netdev_enter_failed(netdev);
+ return r;
+ } else if (ifindex <= 0) {
+ log_netdev_error(netdev, "Got invalid ifindex: %d", ifindex);
+ netdev_enter_failed(netdev);
+ return -EINVAL;
+ }
+
+ if (netdev->ifindex > 0) {
+ if (netdev->ifindex != ifindex) {
+ log_netdev_error(netdev, "Could not set ifindex to %d, already set to %d",
+ ifindex, netdev->ifindex);
+ netdev_enter_failed(netdev);
+ return -EEXIST;
+ } else
+ /* ifindex already set to the same for this netdev */
+ return 0;
+ }
+
+ r = sd_netlink_message_read_string(message, IFLA_IFNAME, &received_name);
+ if (r < 0)
+ return log_netdev_error_errno(netdev, r, "Could not get IFNAME: %m");
+
+ if (!streq(netdev->ifname, received_name)) {
+ log_netdev_error(netdev, "Received newlink with wrong IFNAME %s", received_name);
+ netdev_enter_failed(netdev);
+ return -EINVAL;
+ }
+
+ if (!NETDEV_VTABLE(netdev)->skip_netdev_kind_check) {
+
+ r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
+ if (r < 0)
+ return log_netdev_error_errno(netdev, r, "Could not get LINKINFO: %m");
+
+ r = sd_netlink_message_read_string(message, IFLA_INFO_KIND, &received_kind);
+ if (r < 0)
+ return log_netdev_error_errno(netdev, r, "Could not get KIND: %m");
+
+ r = sd_netlink_message_exit_container(message);
+ if (r < 0)
+ return log_netdev_error_errno(netdev, r, "Could not exit container: %m");
+
+ if (netdev->kind == NETDEV_KIND_TAP)
+ /* the kernel does not distinguish between tun and tap */
+ kind = "tun";
+ else {
+ kind = netdev_kind_to_string(netdev->kind);
+ if (!kind) {
+ log_netdev_error(netdev, "Could not get kind");
+ netdev_enter_failed(netdev);
+ return -EINVAL;
+ }
+ }
+
+ if (!streq(kind, received_kind)) {
+ log_netdev_error(netdev, "Received newlink with wrong KIND %s, expected %s",
+ received_kind, kind);
+ netdev_enter_failed(netdev);
+ return -EINVAL;
+ }
+ }
+
+ netdev->ifindex = ifindex;
+
+ log_netdev_debug(netdev, "netdev has index %d", netdev->ifindex);
+
+ netdev_enter_ready(netdev);
+
+ return 0;
+}
+
+#define HASH_KEY SD_ID128_MAKE(52,e1,45,bd,00,6f,29,96,21,c6,30,6d,83,71,04,48)
+
+int netdev_generate_hw_addr(
+ NetDev *netdev,
+ Link *parent,
+ const char *name,
+ const struct hw_addr_data *hw_addr,
+ struct hw_addr_data *ret) {
+
+ struct hw_addr_data a = HW_ADDR_NULL;
+ bool is_static = false;
+ int r;
+
+ assert(netdev);
+ assert(name);
+ assert(hw_addr);
+ assert(ret);
+
+ if (hw_addr_equal(hw_addr, &HW_ADDR_NONE)) {
+ *ret = HW_ADDR_NULL;
+ return 0;
+ }
+
+ if (hw_addr->length == 0) {
+ uint64_t result;
+
+ /* HardwareAddress= is not specified. */
+
+ if (!NETDEV_VTABLE(netdev)->generate_mac)
+ goto finalize;
+
+ if (!IN_SET(NETDEV_VTABLE(netdev)->iftype, ARPHRD_ETHER, ARPHRD_INFINIBAND))
+ goto finalize;
+
+ r = net_get_unique_predictable_data_from_name(name, &HASH_KEY, &result);
+ if (r < 0) {
+ log_netdev_warning_errno(netdev, r,
+ "Failed to generate persistent MAC address, ignoring: %m");
+ goto finalize;
+ }
+
+ a.length = arphrd_to_hw_addr_len(NETDEV_VTABLE(netdev)->iftype);
+
+ switch (NETDEV_VTABLE(netdev)->iftype) {
+ case ARPHRD_ETHER:
+ assert(a.length <= sizeof(result));
+ memcpy(a.bytes, &result, a.length);
+
+ if (ether_addr_is_null(&a.ether) || ether_addr_is_broadcast(&a.ether)) {
+ log_netdev_warning_errno(netdev, SYNTHETIC_ERRNO(EINVAL),
+ "Failed to generate persistent MAC address, ignoring: %m");
+ a = HW_ADDR_NULL;
+ goto finalize;
+ }
+
+ break;
+ case ARPHRD_INFINIBAND:
+ if (result == 0) {
+ log_netdev_warning_errno(netdev, SYNTHETIC_ERRNO(EINVAL),
+ "Failed to generate persistent MAC address: %m");
+ goto finalize;
+ }
+
+ assert(a.length >= sizeof(result));
+ memzero(a.bytes, a.length - sizeof(result));
+ memcpy(a.bytes + a.length - sizeof(result), &result, sizeof(result));
+ break;
+ default:
+ assert_not_reached();
+ }
+
+ } else {
+ a = *hw_addr;
+ is_static = true;
+ }
+
+ r = net_verify_hardware_address(name, is_static, NETDEV_VTABLE(netdev)->iftype,
+ parent ? &parent->hw_addr : NULL, &a);
+ if (r < 0)
+ return r;
+
+finalize:
+ *ret = a;
+ return 0;
+}
+
+static int netdev_create_message(NetDev *netdev, Link *link, sd_netlink_message *m) {
+ int r;
+
+ r = sd_netlink_message_append_string(m, IFLA_IFNAME, netdev->ifname);
+ if (r < 0)
+ return r;
+
+ struct hw_addr_data hw_addr;
+ r = netdev_generate_hw_addr(netdev, link, netdev->ifname, &netdev->hw_addr, &hw_addr);
+ if (r < 0)
+ return r;
+
+ if (hw_addr.length > 0) {
+ log_netdev_debug(netdev, "Using MAC address: %s", HW_ADDR_TO_STR(&hw_addr));
+ r = netlink_message_append_hw_addr(m, IFLA_ADDRESS, &hw_addr);
+ if (r < 0)
+ return r;
+ }
+
+ if (netdev->mtu != 0) {
+ r = sd_netlink_message_append_u32(m, IFLA_MTU, netdev->mtu);
+ if (r < 0)
+ return r;
+ }
+
+ if (link) {
+ r = sd_netlink_message_append_u32(m, IFLA_LINK, link->ifindex);
+ if (r < 0)
+ return r;
+ }
+
+ r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
+ if (r < 0)
+ return r;
+
+ if (NETDEV_VTABLE(netdev)->fill_message_create) {
+ r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, netdev_kind_to_string(netdev->kind));
+ if (r < 0)
+ return r;
+
+ r = NETDEV_VTABLE(netdev)->fill_message_create(netdev, link, m);
+ if (r < 0)
+ return r;
+
+ r = sd_netlink_message_close_container(m);
+ if (r < 0)
+ return r;
+ } else {
+ r = sd_netlink_message_append_string(m, IFLA_INFO_KIND, netdev_kind_to_string(netdev->kind));
+ if (r < 0)
+ return r;
+ }
+
+ r = sd_netlink_message_close_container(m);
+ if (r < 0)
+ return r;
+
+ return 0;
+}
+
+static int independent_netdev_create(NetDev *netdev) {
+ _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
+ int r;
+
+ assert(netdev);
+
+ /* create netdev */
+ if (NETDEV_VTABLE(netdev)->create) {
+ r = NETDEV_VTABLE(netdev)->create(netdev);
+ if (r < 0)
+ return r;
+
+ log_netdev_debug(netdev, "Created");
+ return 0;
+ }
+
+ r = sd_rtnl_message_new_link(netdev->manager->rtnl, &m, RTM_NEWLINK, 0);
+ if (r < 0)
+ return r;
+
+ r = netdev_create_message(netdev, NULL, m);
+ if (r < 0)
+ return r;
+
+ r = netlink_call_async(netdev->manager->rtnl, NULL, m, netdev_create_handler,
+ netdev_destroy_callback, netdev);
+ if (r < 0)
+ return r;
+
+ netdev_ref(netdev);
+
+ netdev->state = NETDEV_STATE_CREATING;
+ log_netdev_debug(netdev, "Creating");
+ return 0;
+}
+
+static int stacked_netdev_create(NetDev *netdev, Link *link, Request *req) {
+ _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
+ int r;
+
+ assert(netdev);
+ assert(netdev->manager);
+ assert(link);
+ assert(req);
+
+ r = sd_rtnl_message_new_link(netdev->manager->rtnl, &m, RTM_NEWLINK, 0);
+ if (r < 0)
+ return r;
+
+ r = netdev_create_message(netdev, link, m);
+ if (r < 0)
+ return r;
+
+ r = request_call_netlink_async(netdev->manager->rtnl, m, req);
+ if (r < 0)
+ return r;
+
+ netdev->state = NETDEV_STATE_CREATING;
+ log_netdev_debug(netdev, "Creating");
+ return 0;
+}
+
+static bool link_is_ready_to_create_stacked_netdev_one(Link *link, bool allow_unmanaged) {
+ assert(link);
+
+ if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED, LINK_STATE_UNMANAGED))
+ return false;
+
+ if (!link->network)
+ return allow_unmanaged;
+
+ if (link->set_link_messages > 0)
+ return false;
+
+ /* If stacked netdevs are created before the underlying interface being activated, then
+ * the activation policy for the netdevs are ignored. See issue #22593. */
+ if (!link->activated)
+ return false;
+
+ return true;
+}
+
+static bool link_is_ready_to_create_stacked_netdev(Link *link) {
+ return check_ready_for_all_sr_iov_ports(link, /* allow_unmanaged = */ false,
+ link_is_ready_to_create_stacked_netdev_one);
+}
+
+static int netdev_is_ready_to_create(NetDev *netdev, Link *link) {
+ assert(netdev);
+
+ if (netdev->state != NETDEV_STATE_LOADING)
+ return false;
+
+ if (link && !link_is_ready_to_create_stacked_netdev(link))
+ return false;
+
+ if (NETDEV_VTABLE(netdev)->is_ready_to_create)
+ return NETDEV_VTABLE(netdev)->is_ready_to_create(netdev, link);
+
+ return true;
+}
+
+static int stacked_netdev_process_request(Request *req, Link *link, void *userdata) {
+ NetDev *netdev = ASSERT_PTR(userdata);
+ int r;
+
+ assert(req);
+ assert(link);
+
+ r = netdev_is_ready_to_create(netdev, link);
+ if (r <= 0)
+ return r;
+
+ r = stacked_netdev_create(netdev, link, req);
+ if (r < 0)
+ return log_netdev_warning_errno(netdev, r, "Failed to create netdev: %m");
+
+ return 1;
+}
+
+static int create_stacked_netdev_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, void *userdata) {
+ int r;
+
+ assert(m);
+ assert(link);
+
+ r = sd_netlink_message_get_errno(m);
+ if (r < 0 && r != -EEXIST) {
+ log_link_message_warning_errno(link, m, r, "Could not create stacked netdev");
+ link_enter_failed(link);
+ return 0;
+ }
+
+ if (link->create_stacked_netdev_messages == 0) {
+ link->stacked_netdevs_created = true;
+ log_link_debug(link, "Stacked netdevs created.");
+ link_check_ready(link);
+ }
+
+ return 0;
+}
+
+int link_request_stacked_netdev(Link *link, NetDev *netdev) {
+ int r;
+
+ assert(link);
+ assert(netdev);
+
+ if (!netdev_is_stacked(netdev))
+ return -EINVAL;
+
+ if (!IN_SET(netdev->state, NETDEV_STATE_LOADING, NETDEV_STATE_FAILED) || netdev->ifindex > 0)
+ return 0; /* Already created. */
+
+ link->stacked_netdevs_created = false;
+ r = link_queue_request_full(link, REQUEST_TYPE_NETDEV_STACKED,
+ netdev, (mfree_func_t) netdev_unref,
+ trivial_hash_func, trivial_compare_func,
+ stacked_netdev_process_request,
+ &link->create_stacked_netdev_messages,
+ create_stacked_netdev_handler, NULL);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Failed to request stacked netdev '%s': %m",
+ netdev->ifname);
+ if (r == 0)
+ return 0;
+
+ netdev_ref(netdev);
+ log_link_debug(link, "Requested stacked netdev '%s'", netdev->ifname);
+ return 1;
+}
+
+static int independent_netdev_process_request(Request *req, Link *link, void *userdata) {
+ NetDev *netdev = ASSERT_PTR(userdata);
+ int r;
+
+ assert(!link);
+
+ r = netdev_is_ready_to_create(netdev, NULL);
+ if (r <= 0)
+ return r;
+
+ r = independent_netdev_create(netdev);
+ if (r < 0)
+ return log_netdev_warning_errno(netdev, r, "Failed to create netdev: %m");
+
+ return 1;
+}
+
+static int netdev_request_to_create(NetDev *netdev) {
+ int r;
+
+ assert(netdev);
+ assert(netdev->manager);
+
+ if (netdev->manager->test_mode)
+ return 0;
+
+ if (netdev_is_stacked(netdev))
+ return 0;
+
+ r = netdev_is_ready_to_create(netdev, NULL);
+ if (r < 0)
+ return r;
+ if (r > 0) {
+ /* If the netdev has no dependency, then create it now. */
+ r = independent_netdev_create(netdev);
+ if (r < 0)
+ return log_netdev_warning_errno(netdev, r, "Failed to create netdev: %m");
+
+ } else {
+ /* Otherwise, wait for the dependencies being resolved. */
+ r = netdev_queue_request(netdev, independent_netdev_process_request, NULL);
+ if (r < 0)
+ return log_netdev_warning_errno(netdev, r, "Failed to request to create netdev: %m");
+ }
+
+ return 0;
+}
+
+int netdev_load_one(Manager *manager, const char *filename) {
+ _cleanup_(netdev_unrefp) NetDev *netdev_raw = NULL, *netdev = NULL;
+ const char *dropin_dirname;
+ int r;
+
+ assert(manager);
+ assert(filename);
+
+ r = null_or_empty_path(filename);
+ if (r < 0)
+ return log_warning_errno(r, "Failed to check if \"%s\" is empty: %m", filename);
+ if (r > 0) {
+ log_debug("Skipping empty file: %s", filename);
+ return 0;
+ }
+
+ netdev_raw = new(NetDev, 1);
+ if (!netdev_raw)
+ return log_oom();
+
+ *netdev_raw = (NetDev) {
+ .n_ref = 1,
+ .kind = _NETDEV_KIND_INVALID,
+ .state = _NETDEV_STATE_INVALID, /* an invalid state means done() of the implementation won't be called on destruction */
+ };
+
+ dropin_dirname = strjoina(basename(filename), ".d");
+ r = config_parse_many(
+ STRV_MAKE_CONST(filename), NETWORK_DIRS, dropin_dirname, /* root = */ NULL,
+ NETDEV_COMMON_SECTIONS NETDEV_OTHER_SECTIONS,
+ config_item_perf_lookup, network_netdev_gperf_lookup,
+ CONFIG_PARSE_WARN,
+ netdev_raw,
+ NULL,
+ NULL);
+ if (r < 0)
+ return r; /* config_parse_many() logs internally. */
+
+ /* skip out early if configuration does not match the environment */
+ if (!condition_test_list(netdev_raw->conditions, environ, NULL, NULL, NULL)) {
+ log_debug("%s: Conditions in the file do not match the system environment, skipping.", filename);
+ return 0;
+ }
+
+ if (netdev_raw->kind == _NETDEV_KIND_INVALID)
+ return log_warning_errno(SYNTHETIC_ERRNO(EINVAL), "NetDev has no Kind= configured in \"%s\", ignoring.", filename);
+
+ if (!netdev_raw->ifname)
+ return log_warning_errno(SYNTHETIC_ERRNO(EINVAL), "NetDev without Name= configured in \"%s\", ignoring.", filename);
+
+ netdev = malloc0(NETDEV_VTABLE(netdev_raw)->object_size);
+ if (!netdev)
+ return log_oom();
+
+ netdev->n_ref = 1;
+ netdev->manager = manager;
+ netdev->kind = netdev_raw->kind;
+ netdev->state = NETDEV_STATE_LOADING; /* we initialize the state here for the first time,
+ so that done() will be called on destruction */
+
+ if (NETDEV_VTABLE(netdev)->init)
+ NETDEV_VTABLE(netdev)->init(netdev);
+
+ r = config_parse_many(
+ STRV_MAKE_CONST(filename), NETWORK_DIRS, dropin_dirname, /* root = */ NULL,
+ NETDEV_VTABLE(netdev)->sections,
+ config_item_perf_lookup, network_netdev_gperf_lookup,
+ CONFIG_PARSE_WARN,
+ netdev, NULL, NULL);
+ if (r < 0)
+ return r; /* config_parse_many() logs internally. */
+
+ /* verify configuration */
+ if (NETDEV_VTABLE(netdev)->config_verify) {
+ r = NETDEV_VTABLE(netdev)->config_verify(netdev, filename);
+ if (r < 0)
+ return r; /* config_verify() logs internally. */
+ }
+
+ netdev->filename = strdup(filename);
+ if (!netdev->filename)
+ return log_oom();
+
+ r = hashmap_ensure_put(&netdev->manager->netdevs, &string_hash_ops, netdev->ifname, netdev);
+ if (r == -ENOMEM)
+ return log_oom();
+ if (r == -EEXIST) {
+ NetDev *n = hashmap_get(netdev->manager->netdevs, netdev->ifname);
+
+ assert(n);
+ if (!streq(netdev->filename, n->filename))
+ log_netdev_warning_errno(netdev, r,
+ "Device was already configured by \"%s\", ignoring %s.",
+ n->filename, netdev->filename);
+
+ /* Clear ifname before netdev_free() is called. Otherwise, the NetDev object 'n' is
+ * removed from the hashmap 'manager->netdevs'. */
+ netdev->ifname = mfree(netdev->ifname);
+ return -EEXIST;
+ }
+ assert(r > 0);
+
+ log_netdev_debug(netdev, "loaded \"%s\"", netdev_kind_to_string(netdev->kind));
+
+ r = netdev_request_to_create(netdev);
+ if (r < 0)
+ return r; /* netdev_request_to_create() logs internally. */
+
+ TAKE_PTR(netdev);
+ return 0;
+}
+
+int netdev_load(Manager *manager, bool reload) {
+ _cleanup_strv_free_ char **files = NULL;
+ int r;
+
+ assert(manager);
+
+ if (!reload)
+ hashmap_clear_with_destructor(manager->netdevs, netdev_unref);
+
+ r = conf_files_list_strv(&files, ".netdev", NULL, 0, NETWORK_DIRS);
+ if (r < 0)
+ return log_error_errno(r, "Failed to enumerate netdev files: %m");
+
+ STRV_FOREACH(f, files)
+ (void) netdev_load_one(manager, *f);
+
+ return 0;
+}
+
+int config_parse_netdev_kind(
+ const char *unit,
+ const char *filename,
+ unsigned line,
+ const char *section,
+ unsigned section_line,
+ const char *lvalue,
+ int ltype,
+ const char *rvalue,
+ void *data,
+ void *userdata) {
+
+ NetDevKind k, *kind = ASSERT_PTR(data);
+
+ assert(filename);
+ assert(rvalue);
+
+ k = netdev_kind_from_string(rvalue);
+ if (k < 0) {
+ log_syntax(unit, LOG_WARNING, filename, line, k, "Failed to parse netdev kind, ignoring assignment: %s", rvalue);
+ return 0;
+ }
+
+ if (*kind != _NETDEV_KIND_INVALID && *kind != k) {
+ log_syntax(unit, LOG_WARNING, filename, line, 0,
+ "Specified netdev kind is different from the previous value '%s', ignoring assignment: %s",
+ netdev_kind_to_string(*kind), rvalue);
+ return 0;
+ }
+
+ *kind = k;
+
+ return 0;
+}
+
+int config_parse_netdev_hw_addr(
+ const char *unit,
+ const char *filename,
+ unsigned line,
+ const char *section,
+ unsigned section_line,
+ const char *lvalue,
+ int ltype,
+ const char *rvalue,
+ void *data,
+ void *userdata) {
+
+ struct hw_addr_data *hw_addr = ASSERT_PTR(data);
+
+ assert(rvalue);
+
+ if (streq(rvalue, "none")) {
+ *hw_addr = HW_ADDR_NONE;
+ return 0;
+ }
+
+ return config_parse_hw_addr(unit, filename, line, section, section_line, lvalue, ltype, rvalue, data, userdata);
+}