507 lines
18 KiB
C
507 lines
18 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#include <linux/netdevice.h>
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#include <netinet/ether.h>
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#include "sd-device.h"
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#include "sd-netlink.h"
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#include "alloc-util.h"
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#include "conf-files.h"
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#include "conf-parser.h"
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#include "def.h"
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#include "device-util.h"
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#include "ethtool-util.h"
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#include "fd-util.h"
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#include "link-config.h"
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#include "log.h"
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#include "memory-util.h"
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#include "naming-scheme.h"
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#include "netlink-util.h"
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#include "network-internal.h"
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#include "parse-util.h"
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#include "path-util.h"
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#include "proc-cmdline.h"
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#include "random-util.h"
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#include "stat-util.h"
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#include "string-table.h"
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#include "string-util.h"
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#include "strv.h"
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struct link_config_ctx {
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LIST_HEAD(link_config, links);
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int ethtool_fd;
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bool enable_name_policy;
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sd_netlink *rtnl;
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usec_t network_dirs_ts_usec;
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};
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static void link_config_free(link_config *link) {
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if (!link)
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return;
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free(link->filename);
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set_free_free(link->match_mac);
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strv_free(link->match_path);
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strv_free(link->match_driver);
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strv_free(link->match_type);
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strv_free(link->match_name);
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strv_free(link->match_property);
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condition_free_list(link->conditions);
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free(link->description);
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free(link->mac);
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free(link->name_policy);
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free(link->name);
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free(link->alias);
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free(link);
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}
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DEFINE_TRIVIAL_CLEANUP_FUNC(link_config*, link_config_free);
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static void link_configs_free(link_config_ctx *ctx) {
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link_config *link, *link_next;
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if (!ctx)
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return;
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LIST_FOREACH_SAFE(links, link, link_next, ctx->links)
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link_config_free(link);
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}
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void link_config_ctx_free(link_config_ctx *ctx) {
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if (!ctx)
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return;
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safe_close(ctx->ethtool_fd);
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sd_netlink_unref(ctx->rtnl);
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link_configs_free(ctx);
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free(ctx);
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return;
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}
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int link_config_ctx_new(link_config_ctx **ret) {
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_cleanup_(link_config_ctx_freep) link_config_ctx *ctx = NULL;
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if (!ret)
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return -EINVAL;
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ctx = new0(link_config_ctx, 1);
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if (!ctx)
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return -ENOMEM;
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LIST_HEAD_INIT(ctx->links);
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ctx->ethtool_fd = -1;
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ctx->enable_name_policy = true;
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*ret = TAKE_PTR(ctx);
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return 0;
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}
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int link_load_one(link_config_ctx *ctx, const char *filename) {
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_cleanup_(link_config_freep) link_config *link = NULL;
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_cleanup_fclose_ FILE *file = NULL;
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_cleanup_free_ char *name = NULL;
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size_t i;
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int r;
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assert(ctx);
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assert(filename);
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file = fopen(filename, "re");
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if (!file)
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return errno == ENOENT ? 0 : -errno;
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if (null_or_empty_fd(fileno(file))) {
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log_debug("Skipping empty file: %s", filename);
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return 0;
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}
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name = strdup(filename);
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if (!name)
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return -ENOMEM;
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link = new(link_config, 1);
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if (!link)
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return -ENOMEM;
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*link = (link_config) {
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.filename = TAKE_PTR(name),
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.mac_address_policy = _MAC_ADDRESS_POLICY_INVALID,
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.wol = _WOL_INVALID,
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.duplex = _DUP_INVALID,
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.port = _NET_DEV_PORT_INVALID,
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.autonegotiation = -1,
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};
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for (i = 0; i < ELEMENTSOF(link->features); i++)
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link->features[i] = -1;
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r = config_parse(NULL, filename, file,
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"Match\0Link\0",
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config_item_perf_lookup, link_config_gperf_lookup,
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CONFIG_PARSE_WARN, link);
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if (r < 0)
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return r;
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if (link->speed > UINT_MAX)
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return -ERANGE;
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if (set_isempty(link->match_mac) && strv_isempty(link->match_path) &&
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strv_isempty(link->match_driver) && strv_isempty(link->match_type) &&
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strv_isempty(link->match_name) && strv_isempty(link->match_property) && !link->conditions)
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log_warning("%s: No valid settings found in the [Match] section. "
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"The file will match all interfaces. "
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"If that is intended, please add OriginalName=* in the [Match] section.",
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filename);
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if (!condition_test_list(link->conditions, NULL, NULL, NULL)) {
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log_debug("%s: Conditions do not match the system environment, skipping.", filename);
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return 0;
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}
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log_debug("Parsed configuration file %s", filename);
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LIST_PREPEND(links, ctx->links, TAKE_PTR(link));
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return 0;
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}
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static bool enable_name_policy(void) {
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bool b;
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return proc_cmdline_get_bool("net.ifnames", &b) <= 0 || b;
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}
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static int link_unsigned_attribute(sd_device *device, const char *attr, unsigned *type) {
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const char *s;
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int r;
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r = sd_device_get_sysattr_value(device, attr, &s);
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if (r < 0)
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return log_device_debug_errno(device, r, "Failed to query %s: %m", attr);
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r = safe_atou(s, type);
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if (r < 0)
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return log_device_warning_errno(device, r, "Failed to parse %s \"%s\": %m", attr, s);
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log_device_debug(device, "Device has %s=%u", attr, *type);
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return 0;
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}
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int link_config_load(link_config_ctx *ctx) {
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_cleanup_strv_free_ char **files;
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char **f;
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int r;
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link_configs_free(ctx);
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if (!enable_name_policy()) {
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ctx->enable_name_policy = false;
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log_info("Network interface NamePolicy= disabled on kernel command line, ignoring.");
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}
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/* update timestamp */
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paths_check_timestamp(NETWORK_DIRS, &ctx->network_dirs_ts_usec, true);
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r = conf_files_list_strv(&files, ".link", NULL, 0, NETWORK_DIRS);
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if (r < 0)
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return log_error_errno(r, "failed to enumerate link files: %m");
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STRV_FOREACH_BACKWARDS(f, files) {
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r = link_load_one(ctx, *f);
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if (r < 0)
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log_error_errno(r, "Failed to load %s, ignoring: %m", *f);
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}
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return 0;
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}
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bool link_config_should_reload(link_config_ctx *ctx) {
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return paths_check_timestamp(NETWORK_DIRS, &ctx->network_dirs_ts_usec, false);
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}
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int link_config_get(link_config_ctx *ctx, sd_device *device, link_config **ret) {
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link_config *link;
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assert(ctx);
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assert(device);
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assert(ret);
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LIST_FOREACH(links, link, ctx->links) {
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if (net_match_config(link->match_mac, link->match_path, link->match_driver,
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link->match_type, link->match_name, link->match_property, NULL, NULL, NULL,
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device, NULL, NULL, 0, NULL, NULL)) {
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if (link->match_name && !strv_contains(link->match_name, "*")) {
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unsigned name_assign_type = NET_NAME_UNKNOWN;
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(void) link_unsigned_attribute(device, "name_assign_type", &name_assign_type);
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if (name_assign_type == NET_NAME_ENUM) {
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log_device_warning(device, "Config file %s applies to device based on potentially unpredictable interface name",
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link->filename);
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*ret = link;
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return 0;
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} else if (name_assign_type == NET_NAME_RENAMED) {
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log_device_warning(device, "Config file %s matches device based on renamed interface name, ignoring",
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link->filename);
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continue;
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}
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}
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log_device_debug(device, "Config file %s is applied", link->filename);
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*ret = link;
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return 0;
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}
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}
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*ret = NULL;
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return -ENOENT;
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}
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static int get_mac(sd_device *device, MACAddressPolicy policy, struct ether_addr *mac) {
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unsigned addr_type;
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bool want_random = policy == MAC_ADDRESS_POLICY_RANDOM;
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int r;
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assert(IN_SET(policy, MAC_ADDRESS_POLICY_RANDOM, MAC_ADDRESS_POLICY_PERSISTENT));
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r = link_unsigned_attribute(device, "addr_assign_type", &addr_type);
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if (r < 0)
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return r;
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switch (addr_type) {
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case NET_ADDR_SET:
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return log_device_debug(device, "MAC on the device already set by userspace");
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case NET_ADDR_STOLEN:
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return log_device_debug(device, "MAC on the device already set based on another device");
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case NET_ADDR_RANDOM:
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case NET_ADDR_PERM:
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break;
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default:
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return log_device_warning(device, "Unknown addr_assign_type %u, ignoring", addr_type);
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}
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if (want_random == (addr_type == NET_ADDR_RANDOM))
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return log_device_debug(device, "MAC on the device already matches policy *%s*",
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mac_address_policy_to_string(policy));
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if (want_random) {
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log_device_debug(device, "Using random bytes to generate MAC");
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random_bytes(mac->ether_addr_octet, ETH_ALEN);
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} else {
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uint64_t result;
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r = net_get_unique_predictable_data(device,
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naming_scheme_has(NAMING_STABLE_VIRTUAL_MACS),
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&result);
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if (r < 0)
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return log_device_warning_errno(device, r, "Could not generate persistent MAC: %m");
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log_device_debug(device, "Using generated persistent MAC address");
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assert_cc(ETH_ALEN <= sizeof(result));
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memcpy(mac->ether_addr_octet, &result, ETH_ALEN);
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}
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/* see eth_random_addr in the kernel */
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mac->ether_addr_octet[0] &= 0xfe; /* clear multicast bit */
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mac->ether_addr_octet[0] |= 0x02; /* set local assignment bit (IEEE802) */
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return 1;
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}
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int link_config_apply(link_config_ctx *ctx, link_config *config,
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sd_device *device, const char **name) {
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struct ether_addr generated_mac;
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struct ether_addr *mac = NULL;
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const char *new_name = NULL;
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const char *old_name;
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unsigned speed, name_type = NET_NAME_UNKNOWN;
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NamePolicy policy;
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int r, ifindex;
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assert(ctx);
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assert(config);
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assert(device);
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assert(name);
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r = sd_device_get_sysname(device, &old_name);
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if (r < 0)
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return r;
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r = ethtool_set_glinksettings(&ctx->ethtool_fd, old_name,
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config->autonegotiation, config->advertise,
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config->speed, config->duplex, config->port);
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if (r < 0) {
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if (config->port != _NET_DEV_PORT_INVALID)
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log_warning_errno(r, "Could not set port (%s) of %s: %m", port_to_string(config->port), old_name);
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if (!eqzero(config->advertise))
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log_warning_errno(r, "Could not set advertise mode: %m"); /* TODO: include modes in the log message. */
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if (config->speed) {
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speed = DIV_ROUND_UP(config->speed, 1000000);
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if (r == -EOPNOTSUPP) {
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r = ethtool_set_speed(&ctx->ethtool_fd, old_name, speed, config->duplex);
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if (r < 0)
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log_warning_errno(r, "Could not set speed of %s to %u Mbps: %m", old_name, speed);
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}
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}
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if (config->duplex !=_DUP_INVALID)
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log_warning_errno(r, "Could not set duplex of %s to (%s): %m", old_name, duplex_to_string(config->duplex));
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}
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r = ethtool_set_wol(&ctx->ethtool_fd, old_name, config->wol);
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if (r < 0)
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log_warning_errno(r, "Could not set WakeOnLan of %s to %s: %m",
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old_name, wol_to_string(config->wol));
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r = ethtool_set_features(&ctx->ethtool_fd, old_name, config->features);
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if (r < 0)
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log_warning_errno(r, "Could not set offload features of %s: %m", old_name);
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if (config->channels.rx_count_set || config->channels.tx_count_set || config->channels.other_count_set || config->channels.combined_count_set) {
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r = ethtool_set_channels(&ctx->ethtool_fd, old_name, &config->channels);
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if (r < 0)
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log_warning_errno(r, "Could not set channels of %s: %m", old_name);
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}
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if (config->ring.rx_pending_set || config->ring.tx_pending_set) {
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r = ethtool_set_nic_buffer_size(&ctx->ethtool_fd, old_name, &config->ring);
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if (r < 0)
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log_warning_errno(r, "Could not set ring buffer of %s: %m", old_name);
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}
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r = sd_device_get_ifindex(device, &ifindex);
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if (r < 0)
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return log_device_warning_errno(device, r, "Could not find ifindex: %m");
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(void) link_unsigned_attribute(device, "name_assign_type", &name_type);
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if (IN_SET(name_type, NET_NAME_USER, NET_NAME_RENAMED)
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&& !naming_scheme_has(NAMING_ALLOW_RERENAMES)) {
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log_device_debug(device, "Device already has a name given by userspace, not renaming.");
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goto no_rename;
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}
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if (ctx->enable_name_policy && config->name_policy)
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for (NamePolicy *p = config->name_policy; !new_name && *p != _NAMEPOLICY_INVALID; p++) {
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policy = *p;
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switch (policy) {
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case NAMEPOLICY_KERNEL:
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if (name_type != NET_NAME_PREDICTABLE)
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continue;
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/* The kernel claims to have given a predictable name, keep it. */
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log_device_debug(device, "Policy *%s*: keeping predictable kernel name",
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name_policy_to_string(policy));
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goto no_rename;
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case NAMEPOLICY_KEEP:
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if (!IN_SET(name_type, NET_NAME_USER, NET_NAME_RENAMED))
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continue;
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log_device_debug(device, "Policy *%s*: keeping existing userspace name",
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name_policy_to_string(policy));
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goto no_rename;
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case NAMEPOLICY_DATABASE:
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(void) sd_device_get_property_value(device, "ID_NET_NAME_FROM_DATABASE", &new_name);
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break;
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case NAMEPOLICY_ONBOARD:
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(void) sd_device_get_property_value(device, "ID_NET_NAME_ONBOARD", &new_name);
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break;
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case NAMEPOLICY_SLOT:
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(void) sd_device_get_property_value(device, "ID_NET_NAME_SLOT", &new_name);
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break;
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case NAMEPOLICY_PATH:
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(void) sd_device_get_property_value(device, "ID_NET_NAME_PATH", &new_name);
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break;
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case NAMEPOLICY_MAC:
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(void) sd_device_get_property_value(device, "ID_NET_NAME_MAC", &new_name);
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break;
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default:
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assert_not_reached("invalid policy");
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}
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}
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if (new_name)
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log_device_debug(device, "Policy *%s* yields \"%s\".", name_policy_to_string(policy), new_name);
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else if (config->name) {
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new_name = config->name;
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log_device_debug(device, "Policies didn't yield a name, using specified Name=%s.", new_name);
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} else
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log_device_debug(device, "Policies didn't yield a name and Name= is not given, not renaming.");
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no_rename:
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if (IN_SET(config->mac_address_policy, MAC_ADDRESS_POLICY_PERSISTENT, MAC_ADDRESS_POLICY_RANDOM)) {
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if (get_mac(device, config->mac_address_policy, &generated_mac) > 0)
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mac = &generated_mac;
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} else
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mac = config->mac;
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r = rtnl_set_link_properties(&ctx->rtnl, ifindex, config->alias, mac, config->mtu);
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if (r < 0)
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return log_warning_errno(r, "Could not set Alias=, MACAddress= or MTU= on %s: %m", old_name);
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*name = new_name;
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return 0;
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}
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int link_get_driver(link_config_ctx *ctx, sd_device *device, char **ret) {
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const char *name;
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char *driver = NULL;
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int r;
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r = sd_device_get_sysname(device, &name);
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if (r < 0)
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return r;
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r = ethtool_get_driver(&ctx->ethtool_fd, name, &driver);
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if (r < 0)
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return r;
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*ret = driver;
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return 0;
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}
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static const char* const mac_address_policy_table[_MAC_ADDRESS_POLICY_MAX] = {
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[MAC_ADDRESS_POLICY_PERSISTENT] = "persistent",
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[MAC_ADDRESS_POLICY_RANDOM] = "random",
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[MAC_ADDRESS_POLICY_NONE] = "none",
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};
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DEFINE_STRING_TABLE_LOOKUP(mac_address_policy, MACAddressPolicy);
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DEFINE_CONFIG_PARSE_ENUM(config_parse_mac_address_policy, mac_address_policy, MACAddressPolicy,
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"Failed to parse MAC address policy");
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static const char* const name_policy_table[_NAMEPOLICY_MAX] = {
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[NAMEPOLICY_KERNEL] = "kernel",
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[NAMEPOLICY_KEEP] = "keep",
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[NAMEPOLICY_DATABASE] = "database",
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[NAMEPOLICY_ONBOARD] = "onboard",
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[NAMEPOLICY_SLOT] = "slot",
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[NAMEPOLICY_PATH] = "path",
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[NAMEPOLICY_MAC] = "mac",
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};
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DEFINE_STRING_TABLE_LOOKUP(name_policy, NamePolicy);
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DEFINE_CONFIG_PARSE_ENUMV(config_parse_name_policy, name_policy, NamePolicy,
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_NAMEPOLICY_INVALID,
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"Failed to parse interface name policy");
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