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);
100 r = sd_rtnl_open(&ctx->rtnl, 0);
108 static void link_configs_free(link_config_ctx *ctx) {
109 link_config *link, *link_next;
114 LIST_FOREACH_SAFE(links, link, link_next, ctx->links) {
115 free(link->filename);
116 free(link->match_path);
117 free(link->match_driver);
118 free(link->match_type);
119 free(link->description);
126 void link_config_ctx_free(link_config_ctx *ctx) {
130 safe_close(ctx->ethtool_fd);
132 sd_rtnl_unref(ctx->rtnl);
134 link_configs_free(ctx);
141 static int load_link(link_config_ctx *ctx, const char *filename) {
143 _cleanup_fclose_ FILE *file;
149 file = fopen(filename, "re");
157 link = new0(link_config, 1);
163 link->mac_policy = _MACPOLICY_INVALID;
164 link->wol = _WOL_INVALID;
165 link->duplex = _DUP_INVALID;
167 r = config_parse(NULL, filename, file, "Match\0Link\0Ethernet\0", config_item_perf_lookup,
168 (void*) link_config_gperf_lookup, false, false, link);
170 log_warning("Could not parse config file %s: %s", filename, strerror(-r));
173 log_debug("Parsed configuration file %s", filename);
175 link->filename = strdup(filename);
177 LIST_PREPEND(links, ctx->links, link);
186 static bool enable_name_policy(void) {
187 _cleanup_free_ char *line;
192 r = proc_cmdline(&line);
194 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
198 FOREACH_WORD_QUOTED(w, l, line, state)
199 if (strneq(w, "net.ifnames=0", l))
205 int link_config_load(link_config_ctx *ctx) {
209 link_configs_free(ctx);
211 if (!enable_name_policy()) {
212 ctx->enable_name_policy = false;
213 log_info("Network interface NamePolicy= disabled on kernel commandline, ignoring.");
216 /* update timestamp */
217 paths_check_timestamp(link_dirs, &ctx->link_dirs_ts_usec, true);
219 r = conf_files_list_strv(&files, ".link", NULL, link_dirs);
221 log_error("failed to enumerate link files: %s", strerror(-r));
225 STRV_FOREACH_BACKWARDS(f, files) {
226 r = load_link(ctx, *f);
234 bool link_config_should_reload(link_config_ctx *ctx) {
235 return paths_check_timestamp(link_dirs, &ctx->link_dirs_ts_usec, false);
238 int link_config_get(link_config_ctx *ctx, struct udev_device *device, link_config **ret) {
241 LIST_FOREACH(links, link, ctx->links) {
243 if (net_match_config(link->match_mac, link->match_path, link->match_driver,
244 link->match_type, NULL, link->match_host,
245 link->match_virt, link->match_kernel, link->match_arch,
246 udev_device_get_sysattr_value(device, "address"),
247 udev_device_get_property_value(device, "ID_PATH"),
248 udev_device_get_driver(udev_device_get_parent(device)),
249 udev_device_get_property_value(device, "ID_NET_DRIVER"),
250 udev_device_get_devtype(device),
252 log_debug("Config file %s applies to device %s",
254 udev_device_get_sysname(device));
265 static bool mac_is_random(struct udev_device *device) {
270 s = udev_device_get_sysattr_value(device, "addr_assign_type");
272 return false; /* if we don't know, assume it is not random */
273 r = safe_atou(s, &type);
277 /* check for NET_ADDR_RANDOM */
281 static bool mac_is_permanent(struct udev_device *device) {
286 s = udev_device_get_sysattr_value(device, "addr_assign_type");
288 return true; /* if we don't know, assume it is permanent */
289 r = safe_atou(s, &type);
293 /* check for NET_ADDR_PERM */
297 static int get_mac(struct udev_device *device, bool want_random, struct ether_addr *mac) {
301 random_bytes(mac->ether_addr_octet, ETH_ALEN);
305 r = net_get_unique_predictable_data(device, result);
309 assert_cc(ETH_ALEN <= sizeof(result));
310 memcpy(mac->ether_addr_octet, result, ETH_ALEN);
313 /* see eth_random_addr in the kernel */
314 mac->ether_addr_octet[0] &= 0xfe; /* clear multicast bit */
315 mac->ether_addr_octet[0] |= 0x02; /* set local assignment bit (IEEE802) */
320 int link_config_apply(link_config_ctx *ctx, link_config *config, struct udev_device *device, const char **name) {
321 const char *old_name;
322 const char *new_name = NULL;
323 struct ether_addr generated_mac;
324 struct ether_addr *mac = NULL;
332 r = link_config_ctx_connect(ctx);
336 old_name = udev_device_get_sysname(device);
340 r = ethtool_set_speed(ctx->ethtool_fd, old_name, config->speed / 1024, config->duplex);
342 log_warning("Could not set speed or duplex of %s to %u Mbps (%s): %s",
343 old_name, config->speed / 1024, duplex_to_string(config->duplex),
346 r = ethtool_set_wol(ctx->ethtool_fd, old_name, config->wol);
348 log_warning("Could not set WakeOnLan of %s to %s: %s",
349 old_name, wol_to_string(config->wol), strerror(-r));
351 ifindex = udev_device_get_ifindex(device);
353 log_warning("Could not find ifindex");
357 if (ctx->enable_name_policy && config->name_policy) {
360 for (policy = config->name_policy; !new_name && *policy != _NAMEPOLICY_INVALID; policy++) {
362 case NAMEPOLICY_DATABASE:
363 new_name = udev_device_get_property_value(device, "ID_NET_NAME_FROM_DATABASE");
365 case NAMEPOLICY_ONBOARD:
366 new_name = udev_device_get_property_value(device, "ID_NET_NAME_ONBOARD");
368 case NAMEPOLICY_SLOT:
369 new_name = udev_device_get_property_value(device, "ID_NET_NAME_SLOT");
371 case NAMEPOLICY_PATH:
372 new_name = udev_device_get_property_value(device, "ID_NET_NAME_PATH");
375 new_name = udev_device_get_property_value(device, "ID_NET_NAME_MAC");
384 *name = new_name; /* a name was set by a policy */
385 else if (config->name)
386 *name = config->name; /* a name was set manually in the config */
390 switch (config->mac_policy) {
391 case MACPOLICY_PERSISTENT:
392 if (!mac_is_permanent(device)) {
393 r = get_mac(device, false, &generated_mac);
396 mac = &generated_mac;
399 case MACPOLICY_RANDOM:
400 if (!mac_is_random(device)) {
401 r = get_mac(device, true, &generated_mac);
404 mac = &generated_mac;
411 r = rtnl_set_link_properties(ctx->rtnl, ifindex, config->alias, mac, config->mtu);
413 log_warning("Could not set Alias, MACAddress or MTU on %s: %s", old_name, strerror(-r));
420 int link_get_driver(link_config_ctx *ctx, struct udev_device *device, char **ret) {
425 r = link_config_ctx_connect(ctx);
429 name = udev_device_get_sysname(device);
433 r = ethtool_get_driver(ctx->ethtool_fd, name, &driver);
441 static const char* const mac_policy_table[_MACPOLICY_MAX] = {
442 [MACPOLICY_PERSISTENT] = "persistent",
443 [MACPOLICY_RANDOM] = "random"
446 DEFINE_STRING_TABLE_LOOKUP(mac_policy, MACPolicy);
447 DEFINE_CONFIG_PARSE_ENUM(config_parse_mac_policy, mac_policy, MACPolicy, "Failed to parse MAC address policy");
449 static const char* const name_policy_table[_NAMEPOLICY_MAX] = {
450 [NAMEPOLICY_DATABASE] = "database",
451 [NAMEPOLICY_ONBOARD] = "onboard",
452 [NAMEPOLICY_SLOT] = "slot",
453 [NAMEPOLICY_PATH] = "path",
454 [NAMEPOLICY_MAC] = "mac"
457 DEFINE_STRING_TABLE_LOOKUP(name_policy, NamePolicy);
458 DEFINE_CONFIG_PARSE_ENUMV(config_parse_name_policy, name_policy, NamePolicy, _NAMEPOLICY_INVALID, "Failed to parse interface name policy");