Adding upstream version 255.4.upstream/255.4

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

6 files changed, 1410 insertions, 0 deletions

diff --git a/src/udev/net/fuzz-link-parser.c b/src/udev/net/fuzz-link-parser.c
new file mode 100644
index 0000000..2833162
--- /dev/null
+++ b/src/udev/net/fuzz-link-parser.c
@@ -0,0 +1,27 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "fd-util.h"
+#include "fs-util.h"
+#include "fuzz.h"
+#include "link-config.h"
+#include "tmpfile-util.h"
+
+int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
+        _cleanup_(link_config_ctx_freep) LinkConfigContext *ctx = NULL;
+        _cleanup_(unlink_tempfilep) char filename[] = "/tmp/fuzz-link-config.XXXXXX";
+        _cleanup_fclose_ FILE *f = NULL;
+
+        if (outside_size_range(size, 0, 65536))
+                return 0;
+
+        fuzz_setup_logging();
+
+        assert_se(fmkostemp_safe(filename, "r+", &f) == 0);
+        if (size != 0)
+                assert_se(fwrite(data, size, 1, f) == 1);
+
+        fflush(f);
+        assert_se(link_config_ctx_new(&ctx) >= 0);
+        (void) link_load_one(ctx, filename);
+        return 0;
+}
diff --git a/src/udev/net/fuzz-link-parser.options b/src/udev/net/fuzz-link-parser.options
new file mode 100644
index 0000000..678d526
--- /dev/null
+++ b/src/udev/net/fuzz-link-parser.options
@@ -0,0 +1,2 @@
+[libfuzzer]
+max_len = 65536
diff --git a/src/udev/net/link-config-gperf.gperf b/src/udev/net/link-config-gperf.gperf
new file mode 100644
index 0000000..240f16e
--- /dev/null
+++ b/src/udev/net/link-config-gperf.gperf
@@ -0,0 +1,118 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+%{
+#if __GNUC__ >= 7
+_Pragma("GCC diagnostic ignored \"-Wimplicit-fallthrough\"")
+#endif
+#include <stddef.h>
+#include "conf-parser.h"
+#include "ethtool-util.h"
+#include "link-config.h"
+#include "net-condition.h"
+#include "netif-sriov.h"
+#include "socket-util.h"
+%}
+struct ConfigPerfItem;
+%null_strings
+%language=ANSI-C
+%define slot-name section_and_lvalue
+%define hash-function-name link_config_gperf_hash
+%define lookup-function-name link_config_gperf_lookup
+%readonly-tables
+%omit-struct-type
+%struct-type
+%includes
+%%
+Match.MACAddress,                          config_parse_hw_addrs,                 0,                             offsetof(LinkConfig, match.hw_addr)
+Match.PermanentMACAddress,                 config_parse_hw_addrs,                 0,                             offsetof(LinkConfig, match.permanent_hw_addr)
+Match.OriginalName,                        config_parse_match_ifnames,            0,                             offsetof(LinkConfig, match.ifname)
+Match.Path,                                config_parse_match_strv,               0,                             offsetof(LinkConfig, match.path)
+Match.Driver,                              config_parse_match_strv,               0,                             offsetof(LinkConfig, match.driver)
+Match.Type,                                config_parse_match_strv,               0,                             offsetof(LinkConfig, match.iftype)
+Match.Kind,                                config_parse_match_strv,               0,                             offsetof(LinkConfig, match.kind)
+Match.Property,                            config_parse_match_property,           0,                             offsetof(LinkConfig, match.property)
+Match.Host,                                config_parse_net_condition,            CONDITION_HOST,                offsetof(LinkConfig, conditions)
+Match.Virtualization,                      config_parse_net_condition,            CONDITION_VIRTUALIZATION,      offsetof(LinkConfig, conditions)
+Match.KernelCommandLine,                   config_parse_net_condition,            CONDITION_KERNEL_COMMAND_LINE, offsetof(LinkConfig, conditions)
+Match.KernelVersion,                       config_parse_net_condition,            CONDITION_KERNEL_VERSION,      offsetof(LinkConfig, conditions)
+Match.Credential,                          config_parse_net_condition,            CONDITION_CREDENTIAL,          offsetof(LinkConfig, conditions)
+Match.Architecture,                        config_parse_net_condition,            CONDITION_ARCHITECTURE,        offsetof(LinkConfig, conditions)
+Match.Firmware,                            config_parse_net_condition,            CONDITION_FIRMWARE,            offsetof(LinkConfig, conditions)
+Link.Description,                          config_parse_string,                   0,                             offsetof(LinkConfig, description)
+Link.MACAddressPolicy,                     config_parse_mac_address_policy,       0,                             offsetof(LinkConfig, mac_address_policy)
+Link.MACAddress,                           config_parse_hw_addr,                  0,                             offsetof(LinkConfig, hw_addr)
+Link.NamePolicy,                           config_parse_name_policy,              0,                             offsetof(LinkConfig, name_policy)
+Link.Name,                                 config_parse_ifname,                   0,                             offsetof(LinkConfig, name)
+Link.AlternativeName,                      config_parse_ifnames,                  IFNAME_VALID_ALTERNATIVE,      offsetof(LinkConfig, alternative_names)
+Link.AlternativeNamesPolicy,               config_parse_alternative_names_policy, 0,                             offsetof(LinkConfig, alternative_names_policy)
+Link.Alias,                                config_parse_ifalias,                  0,                             offsetof(LinkConfig, alias)
+Link.TransmitQueues,                       config_parse_rx_tx_queues,             0,                             offsetof(LinkConfig, txqueues)
+Link.ReceiveQueues,                        config_parse_rx_tx_queues,             0,                             offsetof(LinkConfig, rxqueues)
+Link.TransmitQueueLength,                  config_parse_txqueuelen,               0,                             offsetof(LinkConfig, txqueuelen)
+Link.MTUBytes,                             config_parse_mtu,                      AF_UNSPEC,                     offsetof(LinkConfig, mtu)
+Link.BitsPerSecond,                        config_parse_si_uint64,                0,                             offsetof(LinkConfig, speed)
+Link.Duplex,                               config_parse_duplex,                   0,                             offsetof(LinkConfig, duplex)
+Link.AutoNegotiation,                      config_parse_tristate,                 0,                             offsetof(LinkConfig, autonegotiation)
+Link.WakeOnLan,                            config_parse_wol,                      0,                             offsetof(LinkConfig, wol)
+Link.WakeOnLanPassword,                    config_parse_wol_password,             0,                             0
+Link.Port,                                 config_parse_port,                     0,                             offsetof(LinkConfig, port)
+Link.ReceiveChecksumOffload,               config_parse_tristate,                 0,                             offsetof(LinkConfig, features[NET_DEV_FEAT_RXCSUM])
+Link.TransmitChecksumOffload,              config_parse_tristate,                 0,                             offsetof(LinkConfig, features[NET_DEV_FEAT_TXCSUM])
+Link.GenericSegmentationOffload,           config_parse_tristate,                 0,                             offsetof(LinkConfig, features[NET_DEV_FEAT_GSO])
+Link.TCPSegmentationOffload,               config_parse_tristate,                 0,                             offsetof(LinkConfig, features[NET_DEV_FEAT_TSO])
+Link.TCP6SegmentationOffload,              config_parse_tristate,                 0,                             offsetof(LinkConfig, features[NET_DEV_FEAT_TSO6])
+Link.UDPSegmentationOffload,               config_parse_warn_compat,              DISABLED_LEGACY,               0
+Link.GenericReceiveOffload,                config_parse_tristate,                 0,                             offsetof(LinkConfig, features[NET_DEV_FEAT_GRO])
+Link.GenericReceiveOffloadHardware,        config_parse_tristate,                 0,                             offsetof(LinkConfig, features[NET_DEV_FEAT_GRO_HW])
+Link.LargeReceiveOffload,                  config_parse_tristate,                 0,                             offsetof(LinkConfig, features[NET_DEV_FEAT_LRO])
+Link.ReceiveVLANCTAGHardwareAcceleration,  config_parse_tristate,                 0,                             offsetof(LinkConfig, features[NET_DEV_FEAT_HW_VLAN_CTAG_RX])
+Link.TransmitVLANCTAGHardwareAcceleration, config_parse_tristate,                 0,                             offsetof(LinkConfig, features[NET_DEV_FEAT_HW_VLAN_CTAG_TX])
+Link.ReceiveVLANCTAGFilter,                config_parse_tristate,                 0,                             offsetof(LinkConfig, features[NET_DEV_FEAT_HW_VLAN_CTAG_FILTER])
+Link.TransmitVLANSTAGHardwareAcceleration, config_parse_tristate,                 0,                             offsetof(LinkConfig, features[NET_DEV_FEAT_HW_VLAN_STAG_TX])
+Link.NTupleFilter,                         config_parse_tristate,                 0,                             offsetof(LinkConfig, features[NET_DEV_FEAT_NTUPLE])
+Link.RxChannels,                           config_parse_ring_buffer_or_channel,   0,                             offsetof(LinkConfig, channels.rx)
+Link.TxChannels,                           config_parse_ring_buffer_or_channel,   0,                             offsetof(LinkConfig, channels.tx)
+Link.OtherChannels,                        config_parse_ring_buffer_or_channel,   0,                             offsetof(LinkConfig, channels.other)
+Link.CombinedChannels,                     config_parse_ring_buffer_or_channel,   0,                             offsetof(LinkConfig, channels.combined)
+Link.Advertise,                            config_parse_advertise,                0,                             offsetof(LinkConfig, advertise)
+Link.RxBufferSize,                         config_parse_ring_buffer_or_channel,   0,                             offsetof(LinkConfig, ring.rx)
+Link.RxMiniBufferSize,                     config_parse_ring_buffer_or_channel,   0,                             offsetof(LinkConfig, ring.rx_mini)
+Link.RxJumboBufferSize,                    config_parse_ring_buffer_or_channel,   0,                             offsetof(LinkConfig, ring.rx_jumbo)
+Link.TxBufferSize,                         config_parse_ring_buffer_or_channel,   0,                             offsetof(LinkConfig, ring.tx)
+Link.RxFlowControl,                        config_parse_tristate,                 0,                             offsetof(LinkConfig, rx_flow_control)
+Link.TxFlowControl,                        config_parse_tristate,                 0,                             offsetof(LinkConfig, tx_flow_control)
+Link.AutoNegotiationFlowControl,           config_parse_tristate,                 0,                             offsetof(LinkConfig, autoneg_flow_control)
+Link.GenericSegmentOffloadMaxBytes,        config_parse_iec_size,                 0,                             offsetof(LinkConfig, gso_max_size)
+Link.GenericSegmentOffloadMaxSegments,     config_parse_uint32,                   0,                             offsetof(LinkConfig, gso_max_segments)
+Link.RxCoalesceSec,                        config_parse_coalesce_sec,             0,                             offsetof(LinkConfig, coalesce.rx_coalesce_usecs)
+Link.RxMaxCoalescedFrames,                 config_parse_coalesce_u32,             0,                             offsetof(LinkConfig, coalesce.rx_max_coalesced_frames)
+Link.RxCoalesceIrqSec,                     config_parse_coalesce_sec,             0,                             offsetof(LinkConfig, coalesce.rx_coalesce_usecs_irq)
+Link.RxMaxCoalescedIrqFrames,              config_parse_coalesce_u32,             0,                             offsetof(LinkConfig, coalesce.rx_max_coalesced_frames_irq)
+Link.TxCoalesceSec,                        config_parse_coalesce_sec,             0,                             offsetof(LinkConfig, coalesce.tx_coalesce_usecs)
+Link.TxMaxCoalescedFrames,                 config_parse_coalesce_u32,             0,                             offsetof(LinkConfig, coalesce.tx_max_coalesced_frames)
+Link.TxCoalesceIrqSec,                     config_parse_coalesce_sec,             0,                             offsetof(LinkConfig, coalesce.tx_coalesce_usecs_irq)
+Link.TxMaxCoalescedIrqFrames,              config_parse_coalesce_u32,             0,                             offsetof(LinkConfig, coalesce.tx_max_coalesced_frames_irq)
+Link.StatisticsBlockCoalesceSec,           config_parse_coalesce_sec,             0,                             offsetof(LinkConfig, coalesce.stats_block_coalesce_usecs)
+Link.UseAdaptiveRxCoalesce,                config_parse_tristate,                 0,                             offsetof(LinkConfig, coalesce.use_adaptive_rx_coalesce)
+Link.UseAdaptiveTxCoalesce,                config_parse_tristate,                 0,                             offsetof(LinkConfig, coalesce.use_adaptive_tx_coalesce)
+Link.CoalescePacketRateLow,                config_parse_coalesce_u32,             0,                             offsetof(LinkConfig, coalesce.pkt_rate_low)
+Link.RxCoalesceLowSec,                     config_parse_coalesce_sec,             0,                             offsetof(LinkConfig, coalesce.rx_coalesce_usecs_low)
+Link.RxMaxCoalescedLowFrames,              config_parse_coalesce_u32,             0,                             offsetof(LinkConfig, coalesce.rx_max_coalesced_frames_low)
+Link.TxCoalesceLowSec,                     config_parse_coalesce_sec,             0,                             offsetof(LinkConfig, coalesce.tx_coalesce_usecs_low)
+Link.TxMaxCoalescedLowFrames,              config_parse_coalesce_u32,             0,                             offsetof(LinkConfig, coalesce.tx_max_coalesced_frames_low)
+Link.CoalescePacketRateHigh,               config_parse_coalesce_u32,             0,                             offsetof(LinkConfig, coalesce.pkt_rate_high)
+Link.RxCoalesceHighSec,                    config_parse_coalesce_sec,             0,                             offsetof(LinkConfig, coalesce.rx_coalesce_usecs_high)
+Link.RxMaxCoalescedHighFrames,             config_parse_coalesce_u32,             0,                             offsetof(LinkConfig, coalesce.rx_max_coalesced_frames_high)
+Link.TxCoalesceHighSec,                    config_parse_coalesce_sec,             0,                             offsetof(LinkConfig, coalesce.tx_coalesce_usecs_high)
+Link.TxMaxCoalescedHighFrames,             config_parse_coalesce_u32,             0,                             offsetof(LinkConfig, coalesce.tx_max_coalesced_frames_high)
+Link.CoalescePacketRateSampleIntervalSec,  config_parse_coalesce_sec,             0,                             offsetof(LinkConfig, coalesce.rate_sample_interval)
+Link.MDI,                                  config_parse_mdi,                      0,                             offsetof(LinkConfig, mdi)
+Link.SR-IOVVirtualFunctions,               config_parse_sr_iov_num_vfs,           0,                             offsetof(LinkConfig, sr_iov_num_vfs)
+SR-IOV.VirtualFunction,                    config_parse_sr_iov_uint32,            0,                             offsetof(LinkConfig, sr_iov_by_section)
+SR-IOV.VLANId,                             config_parse_sr_iov_uint32,            0,                             offsetof(LinkConfig, sr_iov_by_section)
+SR-IOV.QualityOfService,                   config_parse_sr_iov_uint32,            0,                             offsetof(LinkConfig, sr_iov_by_section)
+SR-IOV.VLANProtocol,                       config_parse_sr_iov_vlan_proto,        0,                             offsetof(LinkConfig, sr_iov_by_section)
+SR-IOV.MACSpoofCheck,                      config_parse_sr_iov_boolean,           0,                             offsetof(LinkConfig, sr_iov_by_section)
+SR-IOV.QueryReceiveSideScaling,            config_parse_sr_iov_boolean,           0,                             offsetof(LinkConfig, sr_iov_by_section)
+SR-IOV.Trust,                              config_parse_sr_iov_boolean,           0,                             offsetof(LinkConfig, sr_iov_by_section)
+SR-IOV.LinkState,                          config_parse_sr_iov_link_state,        0,                             offsetof(LinkConfig, sr_iov_by_section)
+SR-IOV.MACAddress,                         config_parse_sr_iov_mac,               0,                             offsetof(LinkConfig, sr_iov_by_section)
diff --git a/src/udev/net/link-config.c b/src/udev/net/link-config.c
new file mode 100644
index 0000000..910ec27
--- /dev/null
+++ b/src/udev/net/link-config.c
@@ -0,0 +1,1133 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <linux/netdevice.h>
+#include <netinet/ether.h>
+#include <unistd.h>
+
+#include "sd-device.h"
+#include "sd-netlink.h"
+
+#include "alloc-util.h"
+#include "arphrd-util.h"
+#include "conf-files.h"
+#include "conf-parser.h"
+#include "constants.h"
+#include "creds-util.h"
+#include "device-private.h"
+#include "device-util.h"
+#include "ethtool-util.h"
+#include "fd-util.h"
+#include "fileio.h"
+#include "link-config.h"
+#include "log-link.h"
+#include "memory-util.h"
+#include "net-condition.h"
+#include "netif-sriov.h"
+#include "netif-util.h"
+#include "netlink-util.h"
+#include "parse-util.h"
+#include "path-lookup.h"
+#include "path-util.h"
+#include "proc-cmdline.h"
+#include "random-util.h"
+#include "stat-util.h"
+#include "string-table.h"
+#include "string-util.h"
+#include "strv.h"
+#include "utf8.h"
+
+struct LinkConfigContext {
+        LIST_HEAD(LinkConfig, configs);
+        int ethtool_fd;
+        Hashmap *stats_by_path;
+};
+
+static LinkConfig* link_config_free(LinkConfig *config) {
+        if (!config)
+                return NULL;
+
+        free(config->filename);
+        strv_free(config->dropins);
+
+        net_match_clear(&config->match);
+        condition_free_list(config->conditions);
+
+        free(config->description);
+        free(config->name_policy);
+        free(config->name);
+        strv_free(config->alternative_names);
+        free(config->alternative_names_policy);
+        free(config->alias);
+        free(config->wol_password_file);
+        erase_and_free(config->wol_password);
+
+        ordered_hashmap_free_with_destructor(config->sr_iov_by_section, sr_iov_free);
+
+        return mfree(config);
+}
+
+DEFINE_TRIVIAL_CLEANUP_FUNC(LinkConfig*, link_config_free);
+
+static void link_configs_free(LinkConfigContext *ctx) {
+        if (!ctx)
+                return;
+
+        ctx->stats_by_path = hashmap_free(ctx->stats_by_path);
+
+        LIST_FOREACH(configs, config, ctx->configs)
+                link_config_free(config);
+}
+
+LinkConfigContext *link_config_ctx_free(LinkConfigContext *ctx) {
+        if (!ctx)
+                return NULL;
+
+        safe_close(ctx->ethtool_fd);
+        link_configs_free(ctx);
+        return mfree(ctx);
+}
+
+int link_config_ctx_new(LinkConfigContext **ret) {
+        _cleanup_(link_config_ctx_freep) LinkConfigContext *ctx = NULL;
+
+        if (!ret)
+                return -EINVAL;
+
+        ctx = new(LinkConfigContext, 1);
+        if (!ctx)
+                return -ENOMEM;
+
+        *ctx = (LinkConfigContext) {
+                .ethtool_fd = -EBADF,
+        };
+
+        *ret = TAKE_PTR(ctx);
+
+        return 0;
+}
+
+static int link_parse_wol_password(LinkConfig *config, const char *str) {
+        _cleanup_(erase_and_freep) uint8_t *p = NULL;
+        int r;
+
+        assert(config);
+        assert(str);
+
+        assert_cc(sizeof(struct ether_addr) == SOPASS_MAX);
+
+        p = new(uint8_t, SOPASS_MAX);
+        if (!p)
+                return -ENOMEM;
+
+        /* Reuse parse_ether_addr(), as their formats are equivalent. */
+        r = parse_ether_addr(str, (struct ether_addr*) p);
+        if (r < 0)
+                return r;
+
+        erase_and_free(config->wol_password);
+        config->wol_password = TAKE_PTR(p);
+        return 0;
+}
+
+static int link_read_wol_password_from_file(LinkConfig *config) {
+        _cleanup_(erase_and_freep) char *password = NULL;
+        int r;
+
+        assert(config);
+
+        if (!config->wol_password_file)
+                return 0;
+
+        r = read_full_file_full(
+                        AT_FDCWD, config->wol_password_file, UINT64_MAX, SIZE_MAX,
+                        READ_FULL_FILE_SECURE | READ_FULL_FILE_WARN_WORLD_READABLE | READ_FULL_FILE_CONNECT_SOCKET,
+                        NULL, &password, NULL);
+        if (r < 0)
+                return r;
+
+        return link_parse_wol_password(config, password);
+}
+
+static int link_read_wol_password_from_cred(LinkConfig *config) {
+        _cleanup_free_ char *base = NULL, *cred_name = NULL;
+        _cleanup_(erase_and_freep) char *password = NULL;
+        int r;
+
+        assert(config);
+        assert(config->filename);
+
+        if (config->wol == UINT32_MAX)
+                return 0; /* WakeOnLan= is not specified. */
+        if (!FLAGS_SET(config->wol, WAKE_MAGICSECURE))
+                return 0; /* secureon is not specified in WakeOnLan=. */
+        if (config->wol_password)
+                return 0; /* WakeOnLanPassword= is specified. */
+        if (config->wol_password_file)
+                return 0; /* a file name is specified in WakeOnLanPassword=, but failed to read it. */
+
+        r = path_extract_filename(config->filename, &base);
+        if (r < 0)
+                return r;
+
+        cred_name = strjoin(base, ".wol.password");
+        if (!cred_name)
+                return -ENOMEM;
+
+        r = read_credential(cred_name, (void**) &password, NULL);
+        if (r == -ENOENT)
+                r = read_credential("wol.password", (void**) &password, NULL);
+        if (r < 0)
+                return r;
+
+        return link_parse_wol_password(config, password);
+}
+
+static int link_adjust_wol_options(LinkConfig *config) {
+        int r;
+
+        assert(config);
+
+        r = link_read_wol_password_from_file(config);
+        if (r == -ENOMEM)
+                return log_oom();
+        if (r < 0)
+                log_warning_errno(r, "Failed to read WakeOnLan password from %s, ignoring: %m", config->wol_password_file);
+
+        r = link_read_wol_password_from_cred(config);
+        if (r == -ENOMEM)
+                return log_oom();
+        if (r < 0)
+                log_warning_errno(r, "Failed to read WakeOnLan password from credential, ignoring: %m");
+
+        if (config->wol != UINT32_MAX && config->wol_password)
+                /* Enable WAKE_MAGICSECURE flag when WakeOnLanPassword=. Note that when
+                 * WakeOnLanPassword= is set without WakeOnLan=, then ethtool_set_wol() enables
+                 * WAKE_MAGICSECURE flag and other flags are not changed. */
+                config->wol |= WAKE_MAGICSECURE;
+
+        return 0;
+}
+
+int link_load_one(LinkConfigContext *ctx, const char *filename) {
+        _cleanup_(link_config_freep) LinkConfig *config = NULL;
+        _cleanup_hashmap_free_ Hashmap *stats_by_path = NULL;
+        _cleanup_free_ char *name = NULL;
+        const char *dropin_dirname;
+        size_t i;
+        int r;
+
+        assert(ctx);
+        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;
+        }
+
+        name = strdup(filename);
+        if (!name)
+                return log_oom();
+
+        config = new(LinkConfig, 1);
+        if (!config)
+                return log_oom();
+
+        *config = (LinkConfig) {
+                .filename = TAKE_PTR(name),
+                .mac_address_policy = MAC_ADDRESS_POLICY_NONE,
+                .wol = UINT32_MAX, /* UINT32_MAX means do not change WOL setting. */
+                .duplex = _DUP_INVALID,
+                .port = _NET_DEV_PORT_INVALID,
+                .autonegotiation = -1,
+                .rx_flow_control = -1,
+                .tx_flow_control = -1,
+                .autoneg_flow_control = -1,
+                .txqueuelen = UINT32_MAX,
+                .coalesce.use_adaptive_rx_coalesce = -1,
+                .coalesce.use_adaptive_tx_coalesce = -1,
+                .mdi = ETH_TP_MDI_INVALID,
+                .sr_iov_num_vfs = UINT32_MAX,
+        };
+
+        for (i = 0; i < ELEMENTSOF(config->features); i++)
+                config->features[i] = -1;
+
+        dropin_dirname = strjoina(basename(filename), ".d");
+        r = config_parse_many(
+                        STRV_MAKE_CONST(filename),
+                        NETWORK_DIRS,
+                        dropin_dirname,
+                        /* root = */ NULL,
+                        "Match\0"
+                        "Link\0"
+                        "SR-IOV\0",
+                        config_item_perf_lookup, link_config_gperf_lookup,
+                        CONFIG_PARSE_WARN, config, &stats_by_path,
+                        &config->dropins);
+        if (r < 0)
+                return r; /* config_parse_many() logs internally. */
+
+        if (ctx->stats_by_path) {
+                r = hashmap_move(ctx->stats_by_path, stats_by_path);
+                if (r < 0)
+                        log_warning_errno(r, "Failed to save stats of '%s' and its drop-in configs, ignoring: %m", filename);
+        } else
+                ctx->stats_by_path = TAKE_PTR(stats_by_path);
+
+        if (net_match_is_empty(&config->match) && !config->conditions) {
+                log_warning("%s: No valid settings found in the [Match] section, ignoring file. "
+                            "To match all interfaces, add OriginalName=* in the [Match] section.",
+                            filename);
+                return 0;
+        }
+
+        if (!condition_test_list(config->conditions, environ, NULL, NULL, NULL)) {
+                log_debug("%s: Conditions do not match the system environment, skipping.", filename);
+                return 0;
+        }
+
+        if (IN_SET(config->mac_address_policy, MAC_ADDRESS_POLICY_PERSISTENT, MAC_ADDRESS_POLICY_RANDOM) &&
+            config->hw_addr.length > 0)
+                log_warning("%s: MACAddress= in [Link] section will be ignored when MACAddressPolicy= "
+                            "is set to \"persistent\" or \"random\".",
+                            filename);
+
+        r = link_adjust_wol_options(config);
+        if (r < 0)
+                return r; /* link_adjust_wol_options() logs internally. */
+
+        r = sr_iov_drop_invalid_sections(config->sr_iov_num_vfs, config->sr_iov_by_section);
+        if (r < 0)
+                return r; /* sr_iov_drop_invalid_sections() logs internally. */
+
+        log_debug("Parsed configuration file \"%s\"", filename);
+
+        LIST_PREPEND(configs, ctx->configs, TAKE_PTR(config));
+        return 0;
+}
+
+static int device_unsigned_attribute(sd_device *device, const char *attr, unsigned *type) {
+        const char *s;
+        int r;
+
+        r = sd_device_get_sysattr_value(device, attr, &s);
+        if (r < 0)
+                return log_device_debug_errno(device, r, "Failed to query %s: %m", attr);
+
+        r = safe_atou(s, type);
+        if (r < 0)
+                return log_device_warning_errno(device, r, "Failed to parse %s \"%s\": %m", attr, s);
+
+        log_device_debug(device, "Device has %s=%u", attr, *type);
+        return 0;
+}
+
+int link_config_load(LinkConfigContext *ctx) {
+        _cleanup_strv_free_ char **files = NULL;
+        int r;
+
+        assert(ctx);
+
+        link_configs_free(ctx);
+
+        r = conf_files_list_strv(&files, ".link", NULL, 0, NETWORK_DIRS);
+        if (r < 0)
+                return log_error_errno(r, "failed to enumerate link files: %m");
+
+        STRV_FOREACH_BACKWARDS(f, files)
+                (void) link_load_one(ctx, *f);
+
+        return 0;
+}
+
+bool link_config_should_reload(LinkConfigContext *ctx) {
+        _cleanup_hashmap_free_ Hashmap *stats_by_path = NULL;
+        int r;
+
+        assert(ctx);
+
+        r = config_get_stats_by_path(".link", NULL, 0, NETWORK_DIRS, /* check_dropins = */ true, &stats_by_path);
+        if (r < 0) {
+                log_warning_errno(r, "Failed to get stats of .link files, ignoring: %m");
+                return true;
+        }
+
+        return !stats_by_path_equal(ctx->stats_by_path, stats_by_path);
+}
+
+Link *link_free(Link *link) {
+        if (!link)
+                return NULL;
+
+        sd_device_unref(link->device);
+        free(link->kind);
+        strv_free(link->altnames);
+        return mfree(link);
+}
+
+int link_new(LinkConfigContext *ctx, sd_netlink **rtnl, sd_device *device, Link **ret) {
+        _cleanup_(link_freep) Link *link = NULL;
+        int r;
+
+        assert(ctx);
+        assert(rtnl);
+        assert(device);
+        assert(ret);
+
+        link = new(Link, 1);
+        if (!link)
+                return -ENOMEM;
+
+        *link = (Link) {
+                .device = sd_device_ref(device),
+        };
+
+        r = sd_device_get_sysname(device, &link->ifname);
+        if (r < 0)
+                return r;
+
+        r = sd_device_get_ifindex(device, &link->ifindex);
+        if (r < 0)
+                return r;
+
+        r = sd_device_get_action(device, &link->action);
+        if (r < 0)
+                return r;
+
+        r = device_unsigned_attribute(device, "name_assign_type", &link->name_assign_type);
+        if (r < 0)
+                log_link_debug_errno(link, r, "Failed to get \"name_assign_type\" attribute, ignoring: %m");
+
+        r = device_unsigned_attribute(device, "addr_assign_type", &link->addr_assign_type);
+        if (r < 0)
+                log_link_debug_errno(link, r, "Failed to get \"addr_assign_type\" attribute, ignoring: %m");
+
+        r = rtnl_get_link_info(rtnl, link->ifindex, &link->iftype, &link->flags,
+                               &link->kind, &link->hw_addr, &link->permanent_hw_addr);
+        if (r < 0)
+                return r;
+
+        if (link->hw_addr.length > 0 && link->permanent_hw_addr.length == 0) {
+                r = ethtool_get_permanent_hw_addr(&ctx->ethtool_fd, link->ifname, &link->permanent_hw_addr);
+                if (r < 0)
+                        log_link_debug_errno(link, r, "Failed to get permanent hardware address, ignoring: %m");
+        }
+
+        r = sd_device_get_property_value(link->device, "ID_NET_DRIVER", &link->driver);
+        if (r < 0 && r != -ENOENT)
+                log_link_debug_errno(link, r, "Failed to get driver, ignoring: %m");
+
+        *ret = TAKE_PTR(link);
+        return 0;
+}
+
+int link_get_config(LinkConfigContext *ctx, Link *link) {
+        int r;
+
+        assert(ctx);
+        assert(link);
+
+        /* Do not configure loopback interfaces by .link files. */
+        if (link->flags & IFF_LOOPBACK)
+                return -ENOENT;
+
+        LIST_FOREACH(configs, config, ctx->configs) {
+                r = net_match_config(
+                                &config->match,
+                                link->device,
+                                &link->hw_addr,
+                                &link->permanent_hw_addr,
+                                link->driver,
+                                link->iftype,
+                                link->kind,
+                                link->ifname,
+                                /* alternative_names = */ NULL,
+                                /* wlan_iftype = */ 0,
+                                /* ssid = */ NULL,
+                                /* bssid = */ NULL);
+                if (r < 0)
+                        return r;
+                if (r == 0)
+                        continue;
+
+                if (config->match.ifname && !strv_contains(config->match.ifname, "*") && link->name_assign_type == NET_NAME_ENUM)
+                        log_link_warning(link, "Config file %s is applied to device based on potentially unpredictable interface name.",
+                                         config->filename);
+                else
+                        log_link_debug(link, "Config file %s is applied", config->filename);
+
+                link->config = config;
+                return 0;
+        }
+
+        return -ENOENT;
+}
+
+static int link_apply_ethtool_settings(Link *link, int *ethtool_fd) {
+        LinkConfig *config;
+        const char *name;
+        int r;
+
+        assert(link);
+        assert(link->config);
+        assert(ethtool_fd);
+
+        config = link->config;
+        name = link->ifname;
+
+        r = ethtool_set_glinksettings(ethtool_fd, name,
+                                      config->autonegotiation, config->advertise,
+                                      config->speed, config->duplex, config->port, config->mdi);
+        if (r < 0) {
+                if (config->autonegotiation >= 0)
+                        log_link_warning_errno(link, r, "Could not %s auto negotiation, ignoring: %m",
+                                               enable_disable(config->autonegotiation));
+
+                if (!eqzero(config->advertise))
+                        log_link_warning_errno(link, r, "Could not set advertise mode, ignoring: %m");
+
+                if (config->speed > 0)
+                        log_link_warning_errno(link, r, "Could not set speed to %"PRIu64"Mbps, ignoring: %m",
+                                               DIV_ROUND_UP(config->speed, 1000000));
+
+                if (config->duplex >= 0)
+                        log_link_warning_errno(link, r, "Could not set duplex to %s, ignoring: %m",
+                                               duplex_to_string(config->duplex));
+
+                if (config->port >= 0)
+                        log_link_warning_errno(link, r, "Could not set port to '%s', ignoring: %m",
+                                               port_to_string(config->port));
+
+                if (config->mdi != ETH_TP_MDI_INVALID)
+                        log_link_warning_errno(link, r, "Could not set MDI-X to '%s', ignoring: %m",
+                                               mdi_to_string(config->mdi));
+        }
+
+        r = ethtool_set_wol(ethtool_fd, name, config->wol, config->wol_password);
+        if (r < 0) {
+                _cleanup_free_ char *str = NULL;
+
+                (void) wol_options_to_string_alloc(config->wol, &str);
+                log_link_warning_errno(link, r, "Could not set WakeOnLan%s%s, ignoring: %m",
+                                       isempty(str) ? "" : " to ", strempty(str));
+        }
+
+        r = ethtool_set_features(ethtool_fd, name, config->features);
+        if (r < 0)
+                log_link_warning_errno(link, r, "Could not set offload features, ignoring: %m");
+
+        r = ethtool_set_channels(ethtool_fd, name, &config->channels);
+        if (r < 0)
+                log_link_warning_errno(link, r, "Could not set channels, ignoring: %m");
+
+        r = ethtool_set_nic_buffer_size(ethtool_fd, name, &config->ring);
+        if (r < 0)
+                log_link_warning_errno(link, r, "Could not set ring buffer, ignoring: %m");
+
+        r = ethtool_set_flow_control(ethtool_fd, name, config->rx_flow_control, config->tx_flow_control, config->autoneg_flow_control);
+        if (r < 0)
+                log_link_warning_errno(link, r, "Could not set flow control, ignoring: %m");
+
+        r = ethtool_set_nic_coalesce_settings(ethtool_fd, name, &config->coalesce);
+        if (r < 0)
+                log_link_warning_errno(link, r, "Could not set coalesce settings, ignoring: %m");
+
+        return 0;
+}
+
+static bool hw_addr_is_valid(Link *link, const struct hw_addr_data *hw_addr) {
+        assert(link);
+        assert(hw_addr);
+
+        switch (link->iftype) {
+        case ARPHRD_ETHER:
+                /* Refuse all zero and all 0xFF. */
+                assert(hw_addr->length == ETH_ALEN);
+                return !ether_addr_is_null(&hw_addr->ether) && !ether_addr_is_broadcast(&hw_addr->ether);
+
+        case ARPHRD_INFINIBAND:
+                /* The last 8 bytes cannot be zero. */
+                assert(hw_addr->length == INFINIBAND_ALEN);
+                return !memeqzero(hw_addr->bytes + INFINIBAND_ALEN - 8, 8);
+
+        default:
+                assert_not_reached();
+        }
+}
+
+static int link_generate_new_hw_addr(Link *link, struct hw_addr_data *ret) {
+        struct hw_addr_data hw_addr = HW_ADDR_NULL;
+        bool is_static = false;
+        uint8_t *p;
+        size_t len;
+        int r;
+
+        assert(link);
+        assert(link->config);
+        assert(link->device);
+        assert(ret);
+
+        if (link->hw_addr.length == 0)
+                goto finalize;
+
+        if (link->config->mac_address_policy == MAC_ADDRESS_POLICY_NONE) {
+                log_link_debug(link, "Using static MAC address.");
+                hw_addr = link->config->hw_addr;
+                is_static = true;
+                goto finalize;
+        }
+
+        if (!IN_SET(link->iftype, ARPHRD_ETHER, ARPHRD_INFINIBAND))
+                goto finalize;
+
+        switch (link->addr_assign_type) {
+        case NET_ADDR_SET:
+                log_link_debug(link, "MAC address on the device already set by userspace.");
+                goto finalize;
+        case NET_ADDR_STOLEN:
+                log_link_debug(link, "MAC address on the device already set based on another device.");
+                goto finalize;
+        case NET_ADDR_RANDOM:
+        case NET_ADDR_PERM:
+                break;
+        default:
+                log_link_warning(link, "Unknown addr_assign_type %u, ignoring", link->addr_assign_type);
+                goto finalize;
+        }
+
+        if ((link->config->mac_address_policy == MAC_ADDRESS_POLICY_RANDOM) == (link->addr_assign_type == NET_ADDR_RANDOM)) {
+                log_link_debug(link, "MAC address on the device already matches policy \"%s\".",
+                               mac_address_policy_to_string(link->config->mac_address_policy));
+                goto finalize;
+        }
+
+        hw_addr = (struct hw_addr_data) {
+                .length = arphrd_to_hw_addr_len(link->iftype),
+        };
+
+        switch (link->iftype) {
+        case ARPHRD_ETHER:
+                p = hw_addr.bytes;
+                len = hw_addr.length;
+                break;
+        case ARPHRD_INFINIBAND:
+                p = hw_addr.bytes + INFINIBAND_ALEN - 8;
+                len = 8;
+                break;
+        default:
+                assert_not_reached();
+        }
+
+        if (link->config->mac_address_policy == MAC_ADDRESS_POLICY_RANDOM)
+                /* We require genuine randomness here, since we want to make sure we won't collide with other
+                 * systems booting up at the very same time. */
+                for (;;) {
+                        random_bytes(p, len);
+                        if (hw_addr_is_valid(link, &hw_addr))
+                                break;
+                }
+
+        else {
+                uint64_t result;
+
+                r = net_get_unique_predictable_data(link->device,
+                                                    naming_scheme_has(NAMING_STABLE_VIRTUAL_MACS),
+                                                    &result);
+                if (r < 0)
+                        return log_link_warning_errno(link, r, "Could not generate persistent MAC address: %m");
+
+                assert(len <= sizeof(result));
+                memcpy(p, &result, len);
+                if (!hw_addr_is_valid(link, &hw_addr))
+                        return log_link_warning_errno(link, SYNTHETIC_ERRNO(EINVAL),
+                                                      "Could not generate valid persistent MAC address: %m");
+        }
+
+finalize:
+
+        r = net_verify_hardware_address(link->ifname, is_static, link->iftype, &link->hw_addr, &hw_addr);
+        if (r < 0)
+                return r;
+
+        if (hw_addr_equal(&link->hw_addr, &hw_addr)) {
+                *ret = HW_ADDR_NULL;
+                return 0;
+        }
+
+        if (hw_addr.length > 0)
+                log_link_debug(link, "Applying %s MAC address: %s",
+                               link->config->mac_address_policy == MAC_ADDRESS_POLICY_NONE ? "static" :
+                               mac_address_policy_to_string(link->config->mac_address_policy),
+                               HW_ADDR_TO_STR(&hw_addr));
+
+        *ret = hw_addr;
+        return 0;
+}
+
+static int link_apply_rtnl_settings(Link *link, sd_netlink **rtnl) {
+        struct hw_addr_data hw_addr = {};
+        LinkConfig *config;
+        int r;
+
+        assert(link);
+        assert(link->config);
+        assert(rtnl);
+
+        config = link->config;
+
+        (void) link_generate_new_hw_addr(link, &hw_addr);
+
+        r = rtnl_set_link_properties(rtnl, link->ifindex, config->alias, &hw_addr,
+                                     config->txqueues, config->rxqueues, config->txqueuelen,
+                                     config->mtu, config->gso_max_size, config->gso_max_segments);
+        if (r < 0)
+                log_link_warning_errno(link, r,
+                                       "Could not set Alias=, MACAddress=/MACAddressPolicy=, "
+                                       "TransmitQueues=, ReceiveQueues=, TransmitQueueLength=, MTUBytes=, "
+                                       "GenericSegmentOffloadMaxBytes= or GenericSegmentOffloadMaxSegments=, "
+                                       "ignoring: %m");
+
+        return 0;
+}
+
+static bool enable_name_policy(void) {
+        static int cached = -1;
+        bool b;
+        int r;
+
+        if (cached >= 0)
+                return cached;
+
+        r = proc_cmdline_get_bool("net.ifnames", /* flags = */ 0, &b);
+        if (r < 0)
+                log_warning_errno(r, "Failed to parse net.ifnames= kernel command line option, ignoring: %m");
+        if (r <= 0)
+                return (cached = true);
+
+        if (!b)
+                log_info("Network interface NamePolicy= disabled on kernel command line.");
+
+        return (cached = b);
+}
+
+static int link_generate_new_name(Link *link) {
+        LinkConfig *config;
+        sd_device *device;
+
+        assert(link);
+        assert(link->config);
+        assert(link->device);
+
+        config = link->config;
+        device = link->device;
+
+        if (link->action != SD_DEVICE_ADD) {
+                log_link_debug(link, "Skipping to apply Name= and NamePolicy= on '%s' uevent.",
+                               device_action_to_string(link->action));
+                goto no_rename;
+        }
+
+        if (IN_SET(link->name_assign_type, NET_NAME_USER, NET_NAME_RENAMED) &&
+            !naming_scheme_has(NAMING_ALLOW_RERENAMES)) {
+                log_link_debug(link, "Device already has a name given by userspace, not renaming.");
+                goto no_rename;
+        }
+
+        if (enable_name_policy() && config->name_policy)
+                for (NamePolicy *policy = config->name_policy; *policy != _NAMEPOLICY_INVALID; policy++) {
+                        const char *new_name = NULL;
+
+                        switch (*policy) {
+                        case NAMEPOLICY_KERNEL:
+                                if (link->name_assign_type != NET_NAME_PREDICTABLE)
+                                        continue;
+
+                                /* The kernel claims to have given a predictable name, keep it. */
+                                log_link_debug(link, "Policy *%s*: keeping predictable kernel name",
+                                               name_policy_to_string(*policy));
+                                goto no_rename;
+                        case NAMEPOLICY_KEEP:
+                                if (!IN_SET(link->name_assign_type, NET_NAME_USER, NET_NAME_RENAMED))
+                                        continue;
+
+                                log_link_debug(link, "Policy *%s*: keeping existing userspace name",
+                                               name_policy_to_string(*policy));
+                                goto no_rename;
+                        case NAMEPOLICY_DATABASE:
+                                (void) sd_device_get_property_value(device, "ID_NET_NAME_FROM_DATABASE", &new_name);
+                                break;
+                        case NAMEPOLICY_ONBOARD:
+                                (void) sd_device_get_property_value(device, "ID_NET_NAME_ONBOARD", &new_name);
+                                break;
+                        case NAMEPOLICY_SLOT:
+                                (void) sd_device_get_property_value(device, "ID_NET_NAME_SLOT", &new_name);
+                                break;
+                        case NAMEPOLICY_PATH:
+                                (void) sd_device_get_property_value(device, "ID_NET_NAME_PATH", &new_name);
+                                break;
+                        case NAMEPOLICY_MAC:
+                                (void) sd_device_get_property_value(device, "ID_NET_NAME_MAC", &new_name);
+                                break;
+                        default:
+                                assert_not_reached();
+                        }
+                        if (ifname_valid(new_name)) {
+                                log_link_debug(link, "Policy *%s* yields \"%s\".", name_policy_to_string(*policy), new_name);
+                                link->new_name = new_name;
+                                return 0;
+                        }
+                }
+
+        if (link->config->name) {
+                log_link_debug(link, "Policies didn't yield a name, using specified Name=%s.", link->config->name);
+                link->new_name = link->config->name;
+                return 0;
+        }
+
+        log_link_debug(link, "Policies didn't yield a name and Name= is not given, not renaming.");
+no_rename:
+        link->new_name = link->ifname;
+        return 0;
+}
+
+static int link_generate_alternative_names(Link *link) {
+        _cleanup_strv_free_ char **altnames = NULL;
+        LinkConfig *config;
+        sd_device *device;
+        int r;
+
+        assert(link);
+        config = ASSERT_PTR(link->config);
+        device = ASSERT_PTR(link->device);
+        assert(!link->altnames);
+
+        if (link->action != SD_DEVICE_ADD) {
+                log_link_debug(link, "Skipping to apply AlternativeNames= and AlternativeNamesPolicy= on '%s' uevent.",
+                               device_action_to_string(link->action));
+                return 0;
+        }
+
+        if (config->alternative_names) {
+                altnames = strv_copy(config->alternative_names);
+                if (!altnames)
+                        return log_oom();
+        }
+
+        if (config->alternative_names_policy)
+                for (NamePolicy *p = config->alternative_names_policy; *p != _NAMEPOLICY_INVALID; p++) {
+                        const char *n = NULL;
+
+                        switch (*p) {
+                        case NAMEPOLICY_DATABASE:
+                                (void) sd_device_get_property_value(device, "ID_NET_NAME_FROM_DATABASE", &n);
+                                break;
+                        case NAMEPOLICY_ONBOARD:
+                                (void) sd_device_get_property_value(device, "ID_NET_NAME_ONBOARD", &n);
+                                break;
+                        case NAMEPOLICY_SLOT:
+                                (void) sd_device_get_property_value(device, "ID_NET_NAME_SLOT", &n);
+                                break;
+                        case NAMEPOLICY_PATH:
+                                (void) sd_device_get_property_value(device, "ID_NET_NAME_PATH", &n);
+                                break;
+                        case NAMEPOLICY_MAC:
+                                (void) sd_device_get_property_value(device, "ID_NET_NAME_MAC", &n);
+                                break;
+                        default:
+                                assert_not_reached();
+                        }
+                        if (ifname_valid_full(n, IFNAME_VALID_ALTERNATIVE)) {
+                                r = strv_extend(&altnames, n);
+                                if (r < 0)
+                                        return log_oom();
+                        }
+                }
+
+        link->altnames = TAKE_PTR(altnames);
+        return 0;
+}
+
+static int sr_iov_configure(Link *link, sd_netlink **rtnl, SRIOV *sr_iov) {
+        _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
+        int r;
+
+        assert(link);
+        assert(rtnl);
+        assert(link->ifindex > 0);
+
+        if (!*rtnl) {
+                r = sd_netlink_open(rtnl);
+                if (r < 0)
+                        return r;
+        }
+
+        r = sd_rtnl_message_new_link(*rtnl, &req, RTM_SETLINK, link->ifindex);
+        if (r < 0)
+                return r;
+
+        r = sr_iov_set_netlink_message(sr_iov, req);
+        if (r < 0)
+                return r;
+
+        r = sd_netlink_call(*rtnl, req, 0, NULL);
+        if (r < 0)
+                return r;
+
+        return 0;
+}
+
+static int link_apply_sr_iov_config(Link *link, sd_netlink **rtnl) {
+        SRIOV *sr_iov;
+        uint32_t n;
+        int r;
+
+        assert(link);
+        assert(link->config);
+        assert(link->device);
+
+        r = sr_iov_set_num_vfs(link->device, link->config->sr_iov_num_vfs, link->config->sr_iov_by_section);
+        if (r < 0)
+                log_link_warning_errno(link, r, "Failed to set the number of SR-IOV virtual functions, ignoring: %m");
+
+        if (ordered_hashmap_isempty(link->config->sr_iov_by_section))
+                return 0;
+
+        r = sr_iov_get_num_vfs(link->device, &n);
+        if (r < 0) {
+                log_link_warning_errno(link, r, "Failed to get the number of SR-IOV virtual functions, ignoring [SR-IOV] sections: %m");
+                return 0;
+        }
+        if (n == 0) {
+                log_link_warning(link, "No SR-IOV virtual function exists, ignoring [SR-IOV] sections: %m");
+                return 0;
+        }
+
+        ORDERED_HASHMAP_FOREACH(sr_iov, link->config->sr_iov_by_section) {
+                if (sr_iov->vf >= n) {
+                        log_link_warning(link, "SR-IOV virtual function %"PRIu32" does not exist, ignoring.", sr_iov->vf);
+                        continue;
+                }
+
+                r = sr_iov_configure(link, rtnl, sr_iov);
+                if (r < 0)
+                        log_link_warning_errno(link, r,
+                                               "Failed to configure SR-IOV virtual function %"PRIu32", ignoring: %m",
+                                               sr_iov->vf);
+        }
+
+        return 0;
+}
+
+int link_apply_config(LinkConfigContext *ctx, sd_netlink **rtnl, Link *link) {
+        int r;
+
+        assert(ctx);
+        assert(rtnl);
+        assert(link);
+
+        if (!IN_SET(link->action, SD_DEVICE_ADD, SD_DEVICE_BIND, SD_DEVICE_MOVE)) {
+                log_link_debug(link, "Skipping to apply .link settings on '%s' uevent.",
+                               device_action_to_string(link->action));
+
+                link->new_name = link->ifname;
+                return 0;
+        }
+
+        r = link_apply_ethtool_settings(link, &ctx->ethtool_fd);
+        if (r < 0)
+                return r;
+
+        r = link_apply_rtnl_settings(link, rtnl);
+        if (r < 0)
+                return r;
+
+        r = link_generate_new_name(link);
+        if (r < 0)
+                return r;
+
+        r = link_generate_alternative_names(link);
+        if (r < 0)
+                return r;
+
+        r = link_apply_sr_iov_config(link, rtnl);
+        if (r < 0)
+                return r;
+
+        return 0;
+}
+
+int config_parse_ifalias(
+                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) {
+
+        char **s = ASSERT_PTR(data);
+
+        assert(filename);
+        assert(lvalue);
+        assert(rvalue);
+
+        if (isempty(rvalue)) {
+                *s = mfree(*s);
+                return 0;
+        }
+
+        if (!ascii_is_valid(rvalue)) {
+                log_syntax(unit, LOG_WARNING, filename, line, 0,
+                           "Interface alias is not ASCII clean, ignoring assignment: %s", rvalue);
+                return 0;
+        }
+
+        if (strlen(rvalue) >= IFALIASZ) {
+                log_syntax(unit, LOG_WARNING, filename, line, 0,
+                           "Interface alias is too long, ignoring assignment: %s", rvalue);
+                return 0;
+        }
+
+        return free_and_strdup_warn(s, rvalue);
+}
+
+int config_parse_rx_tx_queues(
+                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) {
+
+        uint32_t k, *v = data;
+        int r;
+
+        if (isempty(rvalue)) {
+                *v = 0;
+                return 0;
+        }
+
+        r = safe_atou32(rvalue, &k);
+        if (r < 0) {
+                log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to parse %s=, ignoring assignment: %s.", lvalue, rvalue);
+                return 0;
+        }
+        if (k == 0 || k > 4096) {
+                log_syntax(unit, LOG_WARNING, filename, line, 0, "Invalid %s=, ignoring assignment: %s.", lvalue, rvalue);
+                return 0;
+        }
+
+        *v = k;
+        return 0;
+}
+
+int config_parse_txqueuelen(
+                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) {
+
+        uint32_t k, *v = data;
+        int r;
+
+        if (isempty(rvalue)) {
+                *v = UINT32_MAX;
+                return 0;
+        }
+
+        r = safe_atou32(rvalue, &k);
+        if (r < 0) {
+                log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to parse %s=, ignoring assignment: %s.", lvalue, rvalue);
+                return 0;
+        }
+        if (k == UINT32_MAX) {
+                log_syntax(unit, LOG_WARNING, filename, line, 0, "Invalid %s=, ignoring assignment: %s.", lvalue, rvalue);
+                return 0;
+        }
+
+        *v = k;
+        return 0;
+}
+
+int config_parse_wol_password(
+                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) {
+
+        LinkConfig *config = ASSERT_PTR(userdata);
+        int r;
+
+        assert(filename);
+        assert(lvalue);
+        assert(rvalue);
+
+        if (isempty(rvalue)) {
+                config->wol_password = erase_and_free(config->wol_password);
+                config->wol_password_file = mfree(config->wol_password_file);
+                return 0;
+        }
+
+        if (path_is_absolute(rvalue) && path_is_safe(rvalue)) {
+                config->wol_password = erase_and_free(config->wol_password);
+                return free_and_strdup_warn(&config->wol_password_file, rvalue);
+        }
+
+        warn_file_is_world_accessible(filename, NULL, unit, line);
+
+        r = link_parse_wol_password(config, rvalue);
+        if (r == -ENOMEM)
+                return log_oom();
+        if (r < 0) {
+                log_syntax(unit, LOG_WARNING, filename, line, r,
+                           "Failed to parse %s=, ignoring assignment: %s.", lvalue, rvalue);
+                return 0;
+        }
+
+        config->wol_password_file = mfree(config->wol_password_file);
+        return 0;
+}
+
+static const char* const mac_address_policy_table[_MAC_ADDRESS_POLICY_MAX] = {
+        [MAC_ADDRESS_POLICY_PERSISTENT] = "persistent",
+        [MAC_ADDRESS_POLICY_RANDOM] = "random",
+        [MAC_ADDRESS_POLICY_NONE] = "none",
+};
+
+DEFINE_STRING_TABLE_LOOKUP(mac_address_policy, MACAddressPolicy);
+DEFINE_CONFIG_PARSE_ENUM_WITH_DEFAULT(
+        config_parse_mac_address_policy,
+        mac_address_policy,
+        MACAddressPolicy,
+        MAC_ADDRESS_POLICY_NONE,
+        "Failed to parse MAC address policy");
+
+DEFINE_CONFIG_PARSE_ENUMV(config_parse_name_policy, name_policy, NamePolicy,
+                          _NAMEPOLICY_INVALID,
+                          "Failed to parse interface name policy");
+
+DEFINE_CONFIG_PARSE_ENUMV(config_parse_alternative_names_policy, alternative_names_policy, NamePolicy,
+                          _NAMEPOLICY_INVALID,
+                          "Failed to parse alternative names policy");
diff --git a/src/udev/net/link-config.h b/src/udev/net/link-config.h
new file mode 100644
index 0000000..bab9d12
--- /dev/null
+++ b/src/udev/net/link-config.h
@@ -0,0 +1,117 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+#pragma once
+
+#include "sd-device.h"
+#include "sd-netlink.h"
+
+#include "condition.h"
+#include "conf-parser.h"
+#include "ethtool-util.h"
+#include "hashmap.h"
+#include "list.h"
+#include "net-condition.h"
+#include "netif-naming-scheme.h"
+
+typedef struct LinkConfigContext LinkConfigContext;
+typedef struct LinkConfig LinkConfig;
+
+typedef enum MACAddressPolicy {
+        MAC_ADDRESS_POLICY_PERSISTENT,
+        MAC_ADDRESS_POLICY_RANDOM,
+        MAC_ADDRESS_POLICY_NONE,
+        _MAC_ADDRESS_POLICY_MAX,
+        _MAC_ADDRESS_POLICY_INVALID = -EINVAL,
+} MACAddressPolicy;
+
+typedef struct Link {
+        int ifindex;
+        const char *ifname;
+        const char *new_name;
+        char **altnames;
+
+        LinkConfig *config;
+        sd_device *device;
+        sd_device_action_t action;
+
+        char *kind;
+        const char *driver;
+        uint16_t iftype;
+        uint32_t flags;
+        struct hw_addr_data hw_addr;
+        struct hw_addr_data permanent_hw_addr;
+        unsigned name_assign_type;
+        unsigned addr_assign_type;
+} Link;
+
+struct LinkConfig {
+        char *filename;
+        char **dropins;
+
+        NetMatch match;
+        LIST_HEAD(Condition, conditions);
+
+        char *description;
+        struct hw_addr_data hw_addr;
+        MACAddressPolicy mac_address_policy;
+        NamePolicy *name_policy;
+        NamePolicy *alternative_names_policy;
+        char *name;
+        char **alternative_names;
+        char *alias;
+        uint32_t txqueues;
+        uint32_t rxqueues;
+        uint32_t txqueuelen;
+        uint32_t mtu;
+        uint32_t gso_max_segments;
+        size_t gso_max_size;
+        uint64_t speed;
+        Duplex duplex;
+        int autonegotiation;
+        uint32_t advertise[N_ADVERTISE];
+        uint32_t wol;
+        char *wol_password_file;
+        uint8_t *wol_password;
+        NetDevPort port;
+        int features[_NET_DEV_FEAT_MAX];
+        netdev_channels channels;
+        netdev_ring_param ring;
+        int rx_flow_control;
+        int tx_flow_control;
+        int autoneg_flow_control;
+        netdev_coalesce_param coalesce;
+        uint8_t mdi;
+
+        uint32_t sr_iov_num_vfs;
+        OrderedHashmap *sr_iov_by_section;
+
+        LIST_FIELDS(LinkConfig, configs);
+};
+
+int link_config_ctx_new(LinkConfigContext **ret);
+LinkConfigContext* link_config_ctx_free(LinkConfigContext *ctx);
+DEFINE_TRIVIAL_CLEANUP_FUNC(LinkConfigContext*, link_config_ctx_free);
+
+int link_load_one(LinkConfigContext *ctx, const char *filename);
+int link_config_load(LinkConfigContext *ctx);
+bool link_config_should_reload(LinkConfigContext *ctx);
+
+int link_new(LinkConfigContext *ctx, sd_netlink **rtnl, sd_device *device, Link **ret);
+Link *link_free(Link *link);
+DEFINE_TRIVIAL_CLEANUP_FUNC(Link*, link_free);
+
+int link_get_config(LinkConfigContext *ctx, Link *link);
+int link_apply_config(LinkConfigContext *ctx, sd_netlink **rtnl, Link *link);
+
+const char *mac_address_policy_to_string(MACAddressPolicy p) _const_;
+MACAddressPolicy mac_address_policy_from_string(const char *p) _pure_;
+
+/* gperf lookup function */
+const struct ConfigPerfItem* link_config_gperf_lookup(const char *key, GPERF_LEN_TYPE length);
+
+CONFIG_PARSER_PROTOTYPE(config_parse_ifalias);
+CONFIG_PARSER_PROTOTYPE(config_parse_rx_tx_queues);
+CONFIG_PARSER_PROTOTYPE(config_parse_txqueuelen);
+CONFIG_PARSER_PROTOTYPE(config_parse_wol_password);
+CONFIG_PARSER_PROTOTYPE(config_parse_mac_address_policy);
+CONFIG_PARSER_PROTOTYPE(config_parse_name_policy);
+CONFIG_PARSER_PROTOTYPE(config_parse_alternative_names_policy);
diff --git a/src/udev/net/test-link-config-tables.c b/src/udev/net/test-link-config-tables.c
new file mode 100644
index 0000000..a433232
--- /dev/null
+++ b/src/udev/net/test-link-config-tables.c
@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "link-config.h"
+#include "test-tables.h"
+#include "tests.h"
+
+int main(int argc, char **argv) {
+        test_setup_logging(LOG_DEBUG);
+
+        test_table(mac_address_policy, MAC_ADDRESS_POLICY);
+
+        return EXIT_SUCCESS;
+}