1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright (C) 2013 Tom Gundersen <teg@jklm.no>
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
22 #include <netinet/ether.h>
27 #include "link-config.h"
28 #include "ethtool-util.h"
30 #include "libudev-private.h"
35 #include "path-util.h"
36 #include "conf-parser.h"
37 #include "conf-files.h"
40 #include "rtnl-util.h"
41 #include "network-internal.h"
42 #include "siphash24.h"
44 struct link_config_ctx {
45 LIST_HEAD(link_config, links);
49 bool enable_name_policy;
53 usec_t link_dirs_ts_usec;
56 static const char* const link_dirs[] = {
57 "/etc/systemd/network",
58 "/run/systemd/network",
59 "/usr/lib/systemd/network",
61 "/lib/systemd/network",
65 DEFINE_TRIVIAL_CLEANUP_FUNC(link_config_ctx*, link_config_ctx_free);
66 #define _cleanup_link_config_ctx_free_ _cleanup_(link_config_ctx_freep)
68 int link_config_ctx_new(link_config_ctx **ret) {
69 _cleanup_link_config_ctx_free_ link_config_ctx *ctx = NULL;
74 ctx = new0(link_config_ctx, 1);
78 LIST_HEAD_INIT(ctx->links);
82 ctx->enable_name_policy = true;
90 static int link_config_ctx_connect(link_config_ctx *ctx) {
93 if (ctx->ethtool_fd == -1) {
94 r = ethtool_connect(&ctx->ethtool_fd);
96 log_warning("link_config: could not connect to ethtool: %s",
103 r = sd_rtnl_open(&ctx->rtnl, 0);
105 log_warning("link_config: could not connect to rtnl: %s",
114 static void link_configs_free(link_config_ctx *ctx) {
115 link_config *link, *link_next;
120 LIST_FOREACH_SAFE(links, link, link_next, ctx->links) {
121 free(link->filename);
122 free(link->match_path);
123 free(link->match_driver);
124 free(link->match_type);
125 free(link->description);
127 free(link->name_policy);
133 void link_config_ctx_free(link_config_ctx *ctx) {
137 safe_close(ctx->ethtool_fd);
139 sd_rtnl_unref(ctx->rtnl);
141 link_configs_free(ctx);
148 static int load_link(link_config_ctx *ctx, const char *filename) {
149 _cleanup_free_ link_config *link = NULL;
150 _cleanup_fclose_ FILE *file = NULL;
156 file = fopen(filename, "re");
164 if (null_or_empty_fd(fileno(file))) {
165 log_debug("Skipping empty file: %s", filename);
169 link = new0(link_config, 1);
173 link->mac_policy = _MACPOLICY_INVALID;
174 link->wol = _WOL_INVALID;
175 link->duplex = _DUP_INVALID;
177 r = config_parse(NULL, filename, file,
178 "Match\0Link\0Ethernet\0",
179 config_item_perf_lookup, link_config_gperf_lookup,
180 false, false, true, link);
184 log_debug("Parsed configuration file %s", filename);
186 link->filename = strdup(filename);
188 LIST_PREPEND(links, ctx->links, link);
194 static bool enable_name_policy(void) {
195 _cleanup_free_ char *line = NULL;
200 r = proc_cmdline(&line);
202 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
206 FOREACH_WORD_QUOTED(w, l, line, state)
207 if (strneq(w, "net.ifnames=0", l))
213 int link_config_load(link_config_ctx *ctx) {
215 _cleanup_strv_free_ char **files;
218 link_configs_free(ctx);
220 if (!enable_name_policy()) {
221 ctx->enable_name_policy = false;
222 log_info("Network interface NamePolicy= disabled on kernel commandline, ignoring.");
225 /* update timestamp */
226 paths_check_timestamp(link_dirs, &ctx->link_dirs_ts_usec, true);
228 r = conf_files_list_strv(&files, ".link", NULL, link_dirs);
230 log_error("failed to enumerate link files: %s", strerror(-r));
234 STRV_FOREACH_BACKWARDS(f, files) {
235 r = load_link(ctx, *f);
243 bool link_config_should_reload(link_config_ctx *ctx) {
244 return paths_check_timestamp(link_dirs, &ctx->link_dirs_ts_usec, false);
247 int link_config_get(link_config_ctx *ctx, struct udev_device *device, link_config **ret) {
250 LIST_FOREACH(links, link, ctx->links) {
252 if (net_match_config(link->match_mac, link->match_path, link->match_driver,
253 link->match_type, NULL, link->match_host,
254 link->match_virt, link->match_kernel, link->match_arch,
255 ether_aton(udev_device_get_sysattr_value(device, "address")),
256 udev_device_get_property_value(device, "ID_PATH"),
257 udev_device_get_driver(udev_device_get_parent(device)),
258 udev_device_get_property_value(device, "ID_NET_DRIVER"),
259 udev_device_get_devtype(device),
261 log_debug("Config file %s applies to device %s",
263 udev_device_get_sysname(device));
274 static bool mac_is_random(struct udev_device *device) {
279 s = udev_device_get_sysattr_value(device, "addr_assign_type");
281 return false; /* if we don't know, assume it is not random */
282 r = safe_atou(s, &type);
286 /* check for NET_ADDR_RANDOM */
290 static int get_mac(struct udev_device *device, bool want_random, struct ether_addr *mac) {
294 random_bytes(mac->ether_addr_octet, ETH_ALEN);
298 r = net_get_unique_predictable_data(device, result);
302 assert_cc(ETH_ALEN <= sizeof(result));
303 memcpy(mac->ether_addr_octet, result, ETH_ALEN);
306 /* see eth_random_addr in the kernel */
307 mac->ether_addr_octet[0] &= 0xfe; /* clear multicast bit */
308 mac->ether_addr_octet[0] |= 0x02; /* set local assignment bit (IEEE802) */
313 int link_config_apply(link_config_ctx *ctx, link_config *config, struct udev_device *device, const char **name) {
314 const char *old_name;
315 const char *new_name = NULL;
316 struct ether_addr generated_mac;
317 struct ether_addr *mac = NULL;
325 r = link_config_ctx_connect(ctx);
329 old_name = udev_device_get_sysname(device);
333 r = ethtool_set_speed(ctx->ethtool_fd, old_name, config->speed / 1024, config->duplex);
335 log_warning("Could not set speed or duplex of %s to %u Mbps (%s): %s",
336 old_name, config->speed / 1024, duplex_to_string(config->duplex),
339 r = ethtool_set_wol(ctx->ethtool_fd, old_name, config->wol);
341 log_warning("Could not set WakeOnLan of %s to %s: %s",
342 old_name, wol_to_string(config->wol), strerror(-r));
344 ifindex = udev_device_get_ifindex(device);
346 log_warning("Could not find ifindex");
350 if (ctx->enable_name_policy && config->name_policy) {
353 for (policy = config->name_policy; !new_name && *policy != _NAMEPOLICY_INVALID; policy++) {
355 case NAMEPOLICY_DATABASE:
356 new_name = udev_device_get_property_value(device, "ID_NET_NAME_FROM_DATABASE");
358 case NAMEPOLICY_ONBOARD:
359 new_name = udev_device_get_property_value(device, "ID_NET_NAME_ONBOARD");
361 case NAMEPOLICY_SLOT:
362 new_name = udev_device_get_property_value(device, "ID_NET_NAME_SLOT");
364 case NAMEPOLICY_PATH:
365 new_name = udev_device_get_property_value(device, "ID_NET_NAME_PATH");
368 new_name = udev_device_get_property_value(device, "ID_NET_NAME_MAC");
377 *name = new_name; /* a name was set by a policy */
378 else if (config->name)
379 *name = config->name; /* a name was set manually in the config */
383 switch (config->mac_policy) {
384 case MACPOLICY_PERSISTENT:
385 if (mac_is_random(device)) {
386 r = get_mac(device, false, &generated_mac);
391 mac = &generated_mac;
394 case MACPOLICY_RANDOM:
395 if (!mac_is_random(device)) {
396 r = get_mac(device, true, &generated_mac);
401 mac = &generated_mac;
408 r = rtnl_set_link_properties(ctx->rtnl, ifindex, config->alias, mac, config->mtu);
410 log_warning("Could not set Alias, MACAddress or MTU on %s: %s", old_name, strerror(-r));
417 int link_get_driver(link_config_ctx *ctx, struct udev_device *device, char **ret) {
422 r = link_config_ctx_connect(ctx);
426 name = udev_device_get_sysname(device);
430 r = ethtool_get_driver(ctx->ethtool_fd, name, &driver);
438 static const char* const mac_policy_table[_MACPOLICY_MAX] = {
439 [MACPOLICY_PERSISTENT] = "persistent",
440 [MACPOLICY_RANDOM] = "random"
443 DEFINE_STRING_TABLE_LOOKUP(mac_policy, MACPolicy);
444 DEFINE_CONFIG_PARSE_ENUM(config_parse_mac_policy, mac_policy, MACPolicy, "Failed to parse MAC address policy");
446 static const char* const name_policy_table[_NAMEPOLICY_MAX] = {
447 [NAMEPOLICY_DATABASE] = "database",
448 [NAMEPOLICY_ONBOARD] = "onboard",
449 [NAMEPOLICY_SLOT] = "slot",
450 [NAMEPOLICY_PATH] = "path",
451 [NAMEPOLICY_MAC] = "mac"
454 DEFINE_STRING_TABLE_LOOKUP(name_policy, NamePolicy);
455 DEFINE_CONFIG_PARSE_ENUMV(config_parse_name_policy, name_policy, NamePolicy, _NAMEPOLICY_INVALID, "Failed to parse interface name policy");