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 int link_config_ctx_connect(link_config_ctx *ctx) {
94 if (ctx->ethtool_fd == -1) {
95 r = ethtool_connect(&ctx->ethtool_fd);
97 log_warning("link_config: could not connect to ethtool: %s",
104 r = sd_rtnl_open(&ctx->rtnl, 0);
106 log_warning("link_config: could not connect to rtnl: %s",
115 static void link_configs_free(link_config_ctx *ctx) {
116 link_config *link, *link_next;
121 LIST_FOREACH_SAFE(links, link, link_next, ctx->links) {
122 free(link->filename);
123 free(link->match_path);
124 free(link->match_driver);
125 free(link->match_type);
126 free(link->description);
128 free(link->name_policy);
134 void link_config_ctx_free(link_config_ctx *ctx) {
138 safe_close(ctx->ethtool_fd);
140 sd_rtnl_unref(ctx->rtnl);
142 link_configs_free(ctx);
149 static int load_link(link_config_ctx *ctx, const char *filename) {
150 _cleanup_free_ link_config *link = NULL;
151 _cleanup_fclose_ FILE *file = NULL;
157 file = fopen(filename, "re");
165 if (null_or_empty_fd(fileno(file))) {
166 log_debug("Skipping empty file: %s", filename);
170 link = new0(link_config, 1);
174 link->mac_policy = _MACPOLICY_INVALID;
175 link->wol = _WOL_INVALID;
176 link->duplex = _DUP_INVALID;
178 r = config_parse(NULL, filename, file,
179 "Match\0Link\0Ethernet\0",
180 config_item_perf_lookup, link_config_gperf_lookup,
181 false, false, true, link);
185 log_debug("Parsed configuration file %s", filename);
187 link->filename = strdup(filename);
189 LIST_PREPEND(links, ctx->links, link);
195 static bool enable_name_policy(void) {
196 _cleanup_free_ char *line = NULL;
197 const char *word, *state;
201 r = proc_cmdline(&line);
203 log_warning("Failed to read /proc/cmdline, ignoring: %s",
208 FOREACH_WORD_QUOTED(word, l, line, state)
209 if (strneq(word, "net.ifnames=0", l))
215 int link_config_load(link_config_ctx *ctx) {
217 _cleanup_strv_free_ char **files;
220 link_configs_free(ctx);
222 if (!enable_name_policy()) {
223 ctx->enable_name_policy = false;
224 log_info("Network interface NamePolicy= disabled on kernel commandline, ignoring.");
227 /* update timestamp */
228 paths_check_timestamp(link_dirs, &ctx->link_dirs_ts_usec, true);
230 r = conf_files_list_strv(&files, ".link", NULL, link_dirs);
232 log_error("failed to enumerate link files: %s", strerror(-r));
236 STRV_FOREACH_BACKWARDS(f, files) {
237 r = load_link(ctx, *f);
245 bool link_config_should_reload(link_config_ctx *ctx) {
246 return paths_check_timestamp(link_dirs, &ctx->link_dirs_ts_usec, false);
249 int link_config_get(link_config_ctx *ctx, struct udev_device *device,
253 LIST_FOREACH(links, link, ctx->links) {
255 if (net_match_config(link->match_mac, link->match_path, link->match_driver,
256 link->match_type, NULL, link->match_host,
257 link->match_virt, link->match_kernel, link->match_arch,
258 ether_aton(udev_device_get_sysattr_value(device, "address")),
259 udev_device_get_property_value(device, "ID_PATH"),
260 udev_device_get_driver(udev_device_get_parent(device)),
261 udev_device_get_property_value(device, "ID_NET_DRIVER"),
262 udev_device_get_devtype(device),
264 log_debug("Config file %s applies to device %s",
266 udev_device_get_sysname(device));
277 static bool mac_is_random(struct udev_device *device) {
282 s = udev_device_get_sysattr_value(device, "addr_assign_type");
284 return false; /* if we don't know, assume it is not random */
285 r = safe_atou(s, &type);
289 return type == NET_ADDR_RANDOM;
292 static bool should_rename(struct udev_device *device, bool respect_predictable) {
297 s = udev_device_get_sysattr_value(device, "name_assign_type");
299 return true; /* if we don't know, assume we should rename */
300 r = safe_atou(s, &type);
306 case NET_NAME_RENAMED:
307 return false; /* these were already named by userspace, do not touch again */
308 case NET_NAME_PREDICTABLE:
309 if (respect_predictable)
310 return false; /* the kernel claims to have given a predictable name */
314 return true; /* the name is known to be bad, or of an unknown type */
318 static int get_mac(struct udev_device *device, bool want_random,
319 struct ether_addr *mac) {
323 random_bytes(mac->ether_addr_octet, ETH_ALEN);
327 r = net_get_unique_predictable_data(device, result);
331 assert_cc(ETH_ALEN <= sizeof(result));
332 memcpy(mac->ether_addr_octet, result, ETH_ALEN);
335 /* see eth_random_addr in the kernel */
336 mac->ether_addr_octet[0] &= 0xfe; /* clear multicast bit */
337 mac->ether_addr_octet[0] |= 0x02; /* set local assignment bit (IEEE802) */
342 int link_config_apply(link_config_ctx *ctx, link_config *config,
343 struct udev_device *device, const char **name) {
344 const char *old_name;
345 const char *new_name = NULL;
346 struct ether_addr generated_mac;
347 struct ether_addr *mac = NULL;
348 bool respect_predictable = false;
356 r = link_config_ctx_connect(ctx);
360 old_name = udev_device_get_sysname(device);
364 r = ethtool_set_speed(ctx->ethtool_fd, old_name, config->speed / 1024,
367 log_warning("Could not set speed or duplex of %s to %u Mbps (%s): %s",
368 old_name, config->speed / 1024,
369 duplex_to_string(config->duplex), strerror(-r));
371 r = ethtool_set_wol(ctx->ethtool_fd, old_name, config->wol);
373 log_warning("Could not set WakeOnLan of %s to %s: %s",
374 old_name, wol_to_string(config->wol), strerror(-r));
376 ifindex = udev_device_get_ifindex(device);
378 log_warning("Could not find ifindex");
382 if (ctx->enable_name_policy && config->name_policy) {
385 for (policy = config->name_policy;
386 !new_name && *policy != _NAMEPOLICY_INVALID; policy++) {
388 case NAMEPOLICY_KERNEL:
389 respect_predictable = true;
391 case NAMEPOLICY_DATABASE:
392 new_name = udev_device_get_property_value(device, "ID_NET_NAME_FROM_DATABASE");
394 case NAMEPOLICY_ONBOARD:
395 new_name = udev_device_get_property_value(device, "ID_NET_NAME_ONBOARD");
397 case NAMEPOLICY_SLOT:
398 new_name = udev_device_get_property_value(device, "ID_NET_NAME_SLOT");
400 case NAMEPOLICY_PATH:
401 new_name = udev_device_get_property_value(device, "ID_NET_NAME_PATH");
404 new_name = udev_device_get_property_value(device, "ID_NET_NAME_MAC");
412 if (should_rename(device, respect_predictable)) {
414 /* if not set by policy, fall back manually set name */
415 new_name = config->name;
421 switch (config->mac_policy) {
422 case MACPOLICY_PERSISTENT:
423 if (mac_is_random(device)) {
424 r = get_mac(device, false, &generated_mac);
429 mac = &generated_mac;
432 case MACPOLICY_RANDOM:
433 if (!mac_is_random(device)) {
434 r = get_mac(device, true, &generated_mac);
439 mac = &generated_mac;
446 r = rtnl_set_link_properties(ctx->rtnl, ifindex, config->alias, mac,
449 log_warning("Could not set Alias, MACAddress or MTU on %s: %s",
450 old_name, strerror(-r));
457 int link_get_driver(link_config_ctx *ctx, struct udev_device *device, char **ret) {
462 r = link_config_ctx_connect(ctx);
466 name = udev_device_get_sysname(device);
470 r = ethtool_get_driver(ctx->ethtool_fd, name, &driver);
478 static const char* const mac_policy_table[_MACPOLICY_MAX] = {
479 [MACPOLICY_PERSISTENT] = "persistent",
480 [MACPOLICY_RANDOM] = "random"
483 DEFINE_STRING_TABLE_LOOKUP(mac_policy, MACPolicy);
484 DEFINE_CONFIG_PARSE_ENUM(config_parse_mac_policy, mac_policy, MACPolicy,
485 "Failed to parse MAC address policy");
487 static const char* const name_policy_table[_NAMEPOLICY_MAX] = {
488 [NAMEPOLICY_KERNEL] = "kernel",
489 [NAMEPOLICY_DATABASE] = "database",
490 [NAMEPOLICY_ONBOARD] = "onboard",
491 [NAMEPOLICY_SLOT] = "slot",
492 [NAMEPOLICY_PATH] = "path",
493 [NAMEPOLICY_MAC] = "mac"
496 DEFINE_STRING_TABLE_LOOKUP(name_policy, NamePolicy);
497 DEFINE_CONFIG_PARSE_ENUMV(config_parse_name_policy, name_policy, NamePolicy,
499 "Failed to parse interface name policy");