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 if (null_or_empty_path(filename)) {
157 log_debug("skipping empty file: %s", filename);
161 file = fopen(filename, "re");
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,
182 log_warning("Could not parse config file %s: %s", filename, strerror(-r));
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;
201 r = proc_cmdline(&line);
203 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
207 FOREACH_WORD_QUOTED(w, l, line, state)
208 if (strneq(w, "net.ifnames=0", l))
214 int link_config_load(link_config_ctx *ctx) {
216 _cleanup_strv_free_ char **files;
219 link_configs_free(ctx);
221 if (!enable_name_policy()) {
222 ctx->enable_name_policy = false;
223 log_info("Network interface NamePolicy= disabled on kernel commandline, ignoring.");
226 /* update timestamp */
227 paths_check_timestamp(link_dirs, &ctx->link_dirs_ts_usec, true);
229 r = conf_files_list_strv(&files, ".link", NULL, link_dirs);
231 log_error("failed to enumerate link files: %s", strerror(-r));
235 STRV_FOREACH_BACKWARDS(f, files) {
236 r = load_link(ctx, *f);
244 bool link_config_should_reload(link_config_ctx *ctx) {
245 return paths_check_timestamp(link_dirs, &ctx->link_dirs_ts_usec, false);
248 int link_config_get(link_config_ctx *ctx, struct udev_device *device, link_config **ret) {
251 LIST_FOREACH(links, link, ctx->links) {
253 if (net_match_config(link->match_mac, link->match_path, link->match_driver,
254 link->match_type, NULL, link->match_host,
255 link->match_virt, link->match_kernel, link->match_arch,
256 ether_aton(udev_device_get_sysattr_value(device, "address")),
257 udev_device_get_property_value(device, "ID_PATH"),
258 udev_device_get_driver(udev_device_get_parent(device)),
259 udev_device_get_property_value(device, "ID_NET_DRIVER"),
260 udev_device_get_devtype(device),
262 log_debug("Config file %s applies to device %s",
264 udev_device_get_sysname(device));
275 static bool mac_is_random(struct udev_device *device) {
280 s = udev_device_get_sysattr_value(device, "addr_assign_type");
282 return false; /* if we don't know, assume it is not random */
283 r = safe_atou(s, &type);
287 /* check for NET_ADDR_RANDOM */
291 static int get_mac(struct udev_device *device, bool want_random, struct ether_addr *mac) {
295 random_bytes(mac->ether_addr_octet, ETH_ALEN);
299 r = net_get_unique_predictable_data(device, result);
303 assert_cc(ETH_ALEN <= sizeof(result));
304 memcpy(mac->ether_addr_octet, result, ETH_ALEN);
307 /* see eth_random_addr in the kernel */
308 mac->ether_addr_octet[0] &= 0xfe; /* clear multicast bit */
309 mac->ether_addr_octet[0] |= 0x02; /* set local assignment bit (IEEE802) */
314 int link_config_apply(link_config_ctx *ctx, link_config *config, struct udev_device *device, const char **name) {
315 const char *old_name;
316 const char *new_name = NULL;
317 struct ether_addr generated_mac;
318 struct ether_addr *mac = NULL;
326 r = link_config_ctx_connect(ctx);
330 old_name = udev_device_get_sysname(device);
334 r = ethtool_set_speed(ctx->ethtool_fd, old_name, config->speed / 1024, config->duplex);
336 log_warning("Could not set speed or duplex of %s to %u Mbps (%s): %s",
337 old_name, config->speed / 1024, duplex_to_string(config->duplex),
340 r = ethtool_set_wol(ctx->ethtool_fd, old_name, config->wol);
342 log_warning("Could not set WakeOnLan of %s to %s: %s",
343 old_name, wol_to_string(config->wol), strerror(-r));
345 ifindex = udev_device_get_ifindex(device);
347 log_warning("Could not find ifindex");
351 if (ctx->enable_name_policy && config->name_policy) {
354 for (policy = config->name_policy; !new_name && *policy != _NAMEPOLICY_INVALID; policy++) {
356 case NAMEPOLICY_DATABASE:
357 new_name = udev_device_get_property_value(device, "ID_NET_NAME_FROM_DATABASE");
359 case NAMEPOLICY_ONBOARD:
360 new_name = udev_device_get_property_value(device, "ID_NET_NAME_ONBOARD");
362 case NAMEPOLICY_SLOT:
363 new_name = udev_device_get_property_value(device, "ID_NET_NAME_SLOT");
365 case NAMEPOLICY_PATH:
366 new_name = udev_device_get_property_value(device, "ID_NET_NAME_PATH");
369 new_name = udev_device_get_property_value(device, "ID_NET_NAME_MAC");
378 *name = new_name; /* a name was set by a policy */
379 else if (config->name)
380 *name = config->name; /* a name was set manually in the config */
384 switch (config->mac_policy) {
385 case MACPOLICY_PERSISTENT:
386 if (mac_is_random(device)) {
387 r = get_mac(device, false, &generated_mac);
392 mac = &generated_mac;
395 case MACPOLICY_RANDOM:
396 if (!mac_is_random(device)) {
397 r = get_mac(device, true, &generated_mac);
402 mac = &generated_mac;
409 r = rtnl_set_link_properties(ctx->rtnl, ifindex, config->alias, mac, config->mtu);
411 log_warning("Could not set Alias, MACAddress or MTU on %s: %s", old_name, strerror(-r));
418 int link_get_driver(link_config_ctx *ctx, struct udev_device *device, char **ret) {
423 r = link_config_ctx_connect(ctx);
427 name = udev_device_get_sysname(device);
431 r = ethtool_get_driver(ctx->ethtool_fd, name, &driver);
439 static const char* const mac_policy_table[_MACPOLICY_MAX] = {
440 [MACPOLICY_PERSISTENT] = "persistent",
441 [MACPOLICY_RANDOM] = "random"
444 DEFINE_STRING_TABLE_LOOKUP(mac_policy, MACPolicy);
445 DEFINE_CONFIG_PARSE_ENUM(config_parse_mac_policy, mac_policy, MACPolicy, "Failed to parse MAC address policy");
447 static const char* const name_policy_table[_NAMEPOLICY_MAX] = {
448 [NAMEPOLICY_DATABASE] = "database",
449 [NAMEPOLICY_ONBOARD] = "onboard",
450 [NAMEPOLICY_SLOT] = "slot",
451 [NAMEPOLICY_PATH] = "path",
452 [NAMEPOLICY_MAC] = "mac"
455 DEFINE_STRING_TABLE_LOOKUP(name_policy, NamePolicy);
456 DEFINE_CONFIG_PARSE_ENUMV(config_parse_name_policy, name_policy, NamePolicy, _NAMEPOLICY_INVALID, "Failed to parse interface name policy");