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>
23 #include <linux/netdevice.h>
28 #include "link-config.h"
29 #include "ethtool-util.h"
31 #include "libudev-private.h"
36 #include "path-util.h"
37 #include "conf-parser.h"
38 #include "conf-files.h"
41 #include "rtnl-util.h"
42 #include "network-internal.h"
43 #include "siphash24.h"
45 struct link_config_ctx {
46 LIST_HEAD(link_config, links);
50 bool enable_name_policy;
54 usec_t link_dirs_ts_usec;
57 static const char* const link_dirs[] = {
58 "/etc/systemd/network",
59 "/run/systemd/network",
60 "/usr/lib/systemd/network",
62 "/lib/systemd/network",
66 DEFINE_TRIVIAL_CLEANUP_FUNC(link_config_ctx*, link_config_ctx_free);
67 #define _cleanup_link_config_ctx_free_ _cleanup_(link_config_ctx_freep)
69 int link_config_ctx_new(link_config_ctx **ret) {
70 _cleanup_link_config_ctx_free_ link_config_ctx *ctx = NULL;
75 ctx = new0(link_config_ctx, 1);
79 LIST_HEAD_INIT(ctx->links);
83 ctx->enable_name_policy = true;
91 static void link_configs_free(link_config_ctx *ctx) {
92 link_config *link, *link_next;
97 LIST_FOREACH_SAFE(links, link, link_next, ctx->links) {
100 free(link->match_path);
101 free(link->match_driver);
102 free(link->match_type);
103 free(link->description);
105 free(link->name_policy);
111 void link_config_ctx_free(link_config_ctx *ctx) {
115 safe_close(ctx->ethtool_fd);
117 sd_rtnl_unref(ctx->rtnl);
119 link_configs_free(ctx);
126 static int load_link(link_config_ctx *ctx, const char *filename) {
127 _cleanup_free_ link_config *link = NULL;
128 _cleanup_fclose_ FILE *file = NULL;
134 file = fopen(filename, "re");
142 if (null_or_empty_fd(fileno(file))) {
143 log_debug("Skipping empty file: %s", filename);
147 link = new0(link_config, 1);
151 link->mac_policy = _MACPOLICY_INVALID;
152 link->wol = _WOL_INVALID;
153 link->duplex = _DUP_INVALID;
155 r = config_parse(NULL, filename, file,
156 "Match\0Link\0Ethernet\0",
157 config_item_perf_lookup, link_config_gperf_lookup,
158 false, false, true, link);
162 log_debug("Parsed configuration file %s", filename);
164 link->filename = strdup(filename);
166 LIST_PREPEND(links, ctx->links, link);
172 static bool enable_name_policy(void) {
173 _cleanup_free_ char *line = NULL;
174 const char *word, *state;
178 r = proc_cmdline(&line);
180 log_warning_errno(r, "Failed to read /proc/cmdline, ignoring: %m");
184 FOREACH_WORD_QUOTED(word, l, line, state)
185 if (strneq(word, "net.ifnames=0", l))
191 int link_config_load(link_config_ctx *ctx) {
193 _cleanup_strv_free_ char **files;
196 link_configs_free(ctx);
198 if (!enable_name_policy()) {
199 ctx->enable_name_policy = false;
200 log_info("Network interface NamePolicy= disabled on kernel command line, ignoring.");
203 /* update timestamp */
204 paths_check_timestamp(link_dirs, &ctx->link_dirs_ts_usec, true);
206 r = conf_files_list_strv(&files, ".link", NULL, link_dirs);
208 return log_error_errno(r, "failed to enumerate link files: %m");
210 STRV_FOREACH_BACKWARDS(f, files) {
211 r = load_link(ctx, *f);
219 bool link_config_should_reload(link_config_ctx *ctx) {
220 return paths_check_timestamp(link_dirs, &ctx->link_dirs_ts_usec, false);
223 int link_config_get(link_config_ctx *ctx, struct udev_device *device,
227 LIST_FOREACH(links, link, ctx->links) {
228 const char* attr_value;
229 unsigned char name_assign_type = NET_NAME_UNKNOWN;
231 attr_value = udev_device_get_sysattr_value(device, "name_assign_type");
233 (void)safe_atou8(attr_value, &name_assign_type);
235 attr_value = udev_device_get_sysattr_value(device, "address");
237 if (net_match_config(link->match_mac, link->match_path, link->match_driver,
238 link->match_type, link->match_name, link->match_host,
239 link->match_virt, link->match_kernel, link->match_arch,
240 attr_value ? ether_aton(attr_value) : NULL,
241 udev_device_get_property_value(device, "ID_PATH"),
242 udev_device_get_driver(udev_device_get_parent(device)),
243 udev_device_get_property_value(device, "ID_NET_DRIVER"),
244 udev_device_get_devtype(device),
245 udev_device_get_sysname(device),
246 name_assign_type == NET_NAME_RENAMED)) {
247 log_debug("Config file %s applies to device %s",
249 udev_device_get_sysname(device));
260 static bool mac_is_random(struct udev_device *device) {
265 /* if we can't get the assign type, assume it is not random */
266 s = udev_device_get_sysattr_value(device, "addr_assign_type");
270 r = safe_atou(s, &type);
274 return type == NET_ADDR_RANDOM;
277 static bool should_rename(struct udev_device *device, bool respect_predictable) {
282 /* if we can't get the assgin type, assume we should rename */
283 s = udev_device_get_sysattr_value(device, "name_assign_type");
287 r = safe_atou(s, &type);
293 case NET_NAME_RENAMED:
294 /* these were already named by userspace, do not touch again */
296 case NET_NAME_PREDICTABLE:
297 /* the kernel claims to have given a predictable name */
298 if (respect_predictable)
303 /* the name is known to be bad, or of an unknown type */
308 static int get_mac(struct udev_device *device, bool want_random,
309 struct ether_addr *mac) {
313 random_bytes(mac->ether_addr_octet, ETH_ALEN);
317 r = net_get_unique_predictable_data(device, result);
321 assert_cc(ETH_ALEN <= sizeof(result));
322 memcpy(mac->ether_addr_octet, result, ETH_ALEN);
325 /* see eth_random_addr in the kernel */
326 mac->ether_addr_octet[0] &= 0xfe; /* clear multicast bit */
327 mac->ether_addr_octet[0] |= 0x02; /* set local assignment bit (IEEE802) */
332 int link_config_apply(link_config_ctx *ctx, link_config *config,
333 struct udev_device *device, const char **name) {
334 const char *old_name;
335 const char *new_name = NULL;
336 struct ether_addr generated_mac;
337 struct ether_addr *mac = NULL;
338 bool respect_predictable = false;
346 old_name = udev_device_get_sysname(device);
350 r = ethtool_set_speed(&ctx->ethtool_fd, old_name, config->speed / 1024,
353 log_warning_errno(r, "Could not set speed or duplex of %s to %u Mbps (%s): %m",
354 old_name, config->speed / 1024,
355 duplex_to_string(config->duplex));
357 r = ethtool_set_wol(&ctx->ethtool_fd, old_name, config->wol);
359 log_warning_errno(r, "Could not set WakeOnLan of %s to %s: %m",
360 old_name, wol_to_string(config->wol));
362 ifindex = udev_device_get_ifindex(device);
364 log_warning("Could not find ifindex");
368 if (ctx->enable_name_policy && config->name_policy) {
371 for (policy = config->name_policy;
372 !new_name && *policy != _NAMEPOLICY_INVALID; policy++) {
374 case NAMEPOLICY_KERNEL:
375 respect_predictable = true;
377 case NAMEPOLICY_DATABASE:
378 new_name = udev_device_get_property_value(device, "ID_NET_NAME_FROM_DATABASE");
380 case NAMEPOLICY_ONBOARD:
381 new_name = udev_device_get_property_value(device, "ID_NET_NAME_ONBOARD");
383 case NAMEPOLICY_SLOT:
384 new_name = udev_device_get_property_value(device, "ID_NET_NAME_SLOT");
386 case NAMEPOLICY_PATH:
387 new_name = udev_device_get_property_value(device, "ID_NET_NAME_PATH");
390 new_name = udev_device_get_property_value(device, "ID_NET_NAME_MAC");
398 if (should_rename(device, respect_predictable)) {
399 /* if not set by policy, fall back manually set name */
401 new_name = config->name;
405 switch (config->mac_policy) {
406 case MACPOLICY_PERSISTENT:
407 if (mac_is_random(device)) {
408 r = get_mac(device, false, &generated_mac);
413 mac = &generated_mac;
416 case MACPOLICY_RANDOM:
417 if (!mac_is_random(device)) {
418 r = get_mac(device, true, &generated_mac);
423 mac = &generated_mac;
430 r = rtnl_set_link_properties(&ctx->rtnl, ifindex, config->alias, mac,
433 return log_warning_errno(r, "Could not set Alias, MACAddress or MTU on %s: %m", old_name);
440 int link_get_driver(link_config_ctx *ctx, struct udev_device *device, char **ret) {
445 name = udev_device_get_sysname(device);
449 r = ethtool_get_driver(&ctx->ethtool_fd, name, &driver);
457 static const char* const mac_policy_table[_MACPOLICY_MAX] = {
458 [MACPOLICY_PERSISTENT] = "persistent",
459 [MACPOLICY_RANDOM] = "random"
462 DEFINE_STRING_TABLE_LOOKUP(mac_policy, MACPolicy);
463 DEFINE_CONFIG_PARSE_ENUM(config_parse_mac_policy, mac_policy, MACPolicy,
464 "Failed to parse MAC address policy");
466 static const char* const name_policy_table[_NAMEPOLICY_MAX] = {
467 [NAMEPOLICY_KERNEL] = "kernel",
468 [NAMEPOLICY_DATABASE] = "database",
469 [NAMEPOLICY_ONBOARD] = "onboard",
470 [NAMEPOLICY_SLOT] = "slot",
471 [NAMEPOLICY_PATH] = "path",
472 [NAMEPOLICY_MAC] = "mac"
475 DEFINE_STRING_TABLE_LOOKUP(name_policy, NamePolicy);
476 DEFINE_CONFIG_PARSE_ENUMV(config_parse_name_policy, name_policy, NamePolicy,
478 "Failed to parse interface name policy");