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"
42 #include "siphash24.h"
44 struct link_config_ctx {
45 LIST_HEAD(link_config, links);
49 bool enable_name_policy;
54 usec_t link_dirs_ts_usec;
57 DEFINE_TRIVIAL_CLEANUP_FUNC(link_config_ctx*, link_config_ctx_free);
58 #define _cleanup_link_config_ctx_free_ _cleanup_(link_config_ctx_freep)
60 int link_config_ctx_new(link_config_ctx **ret) {
61 _cleanup_link_config_ctx_free_ link_config_ctx *ctx = NULL;
66 ctx = new0(link_config_ctx, 1);
70 LIST_HEAD_INIT(ctx->links);
74 ctx->enable_name_policy = true;
76 ctx->link_dirs = strv_new("/etc/systemd/network",
77 "/run/systemd/network",
78 "/usr/lib/systemd/network",
80 "/lib/systemd/network",
83 if (!ctx->link_dirs) {
84 log_error("failed to build link config directory array");
88 if (!path_strv_canonicalize_uniq(ctx->link_dirs)) {
89 log_error("failed to canonicalize link config directories");
99 static int link_config_ctx_connect(link_config_ctx *ctx) {
102 if (ctx->ethtool_fd >= 0 && ctx->rtnl)
105 r = ethtool_connect(&ctx->ethtool_fd);
109 r = sd_rtnl_open(0, &ctx->rtnl);
116 static void link_configs_free(link_config_ctx *ctx) {
117 link_config *link, *link_next;
122 LIST_FOREACH_SAFE(links, link, link_next, ctx->links) {
123 free(link->filename);
124 free(link->match_path);
125 free(link->match_driver);
126 free(link->match_type);
127 free(link->description);
134 void link_config_ctx_free(link_config_ctx *ctx) {
138 if (ctx->ethtool_fd >= 0)
139 close_nointr_nofail(ctx->ethtool_fd);
141 sd_rtnl_unref(ctx->rtnl);
143 strv_free(ctx->link_dirs);
144 link_configs_free(ctx);
151 static int load_link(link_config_ctx *ctx, const char *filename) {
153 _cleanup_fclose_ FILE *file;
159 file = fopen(filename, "re");
167 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, "Match\0Link\0Ethernet\0", config_item_perf_lookup,
178 (void*) link_config_gperf_lookup, false, false, link);
180 log_warning("Could not parse config file %s: %s", filename, strerror(-r));
183 log_debug("Parsed configuration file %s", filename);
185 link->filename = strdup(filename);
187 LIST_PREPEND(links, ctx->links, link);
196 static bool enable_name_policy(void) {
197 _cleanup_free_ char *line;
202 r = proc_cmdline(&line);
204 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
208 FOREACH_WORD_QUOTED(w, l, line, state)
209 if (strneq(w, "net.ifnames=0", l))
215 int link_config_load(link_config_ctx *ctx) {
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(ctx->link_dirs, &ctx->link_dirs_ts_usec, true);
229 r = conf_files_list_strv(&files, ".link", NULL, (const char **)ctx->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(ctx->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,
254 link->match_driver, link->match_type, NULL,
255 udev_device_get_sysattr_value(device, "address"),
256 udev_device_get_property_value(device, "ID_PATH"),
257 udev_device_get_driver(device),
258 udev_device_get_devtype(device),
260 log_debug("Config file %s applies to device %s",
262 udev_device_get_sysname(device));
273 static bool mac_is_random(struct udev_device *device) {
278 s = udev_device_get_sysattr_value(device, "addr_assign_type");
280 return false; /* if we don't know, assume it is not random */
281 r = safe_atou(s, &type);
285 /* check for NET_ADDR_RANDOM */
289 static bool mac_is_permanent(struct udev_device *device) {
294 s = udev_device_get_sysattr_value(device, "addr_assign_type");
296 return true; /* if we don't know, assume it is permanent */
297 r = safe_atou(s, &type);
301 /* check for NET_ADDR_PERM */
305 #define HASH_KEY SD_ID128_MAKE(d3,1e,48,fa,90,fe,4b,4c,9d,af,d5,d7,a1,b1,2e,8a)
307 static int get_mac(struct udev_device *device, bool want_random, struct ether_addr *mac) {
311 random_bytes(mac->ether_addr_octet, ETH_ALEN);
318 /* fetch some persistent data unique (on this machine) to this device */
319 name = udev_device_get_property_value(device, "ID_NET_NAME_ONBOARD");
321 name = udev_device_get_property_value(device, "ID_NET_NAME_SLOT");
323 name = udev_device_get_property_value(device, "ID_NET_NAME_PATH");
330 sz = sizeof(sd_id128_t) + l;
333 /* fetch some persistent data unique to this machine */
334 r = sd_id128_get_machine((sd_id128_t*) v);
337 memcpy(v + sizeof(sd_id128_t), name, l);
339 /* Let's hash the machine ID plus the device name. We
340 * use a fixed, but originally randomly created hash
342 siphash24(result, v, sz, HASH_KEY.bytes);
344 assert_cc(ETH_ALEN <= sizeof(result));
345 memcpy(mac->ether_addr_octet, result, ETH_ALEN);
348 /* see eth_random_addr in the kernel */
349 mac->ether_addr_octet[0] &= 0xfe; /* clear multicast bit */
350 mac->ether_addr_octet[0] |= 0x02; /* set local assignment bit (IEEE802) */
355 int link_config_apply(link_config_ctx *ctx, link_config *config, struct udev_device *device, const char **name) {
356 const char *old_name;
357 const char *new_name = NULL;
358 struct ether_addr generated_mac;
359 struct ether_addr *mac = NULL;
367 r = link_config_ctx_connect(ctx);
371 old_name = udev_device_get_sysname(device);
375 r = ethtool_set_speed(ctx->ethtool_fd, old_name, config->speed, config->duplex);
377 log_warning("Could not set speed or duplex of %s to %u Mbytes (%s): %s",
378 old_name, config->speed, duplex_to_string(config->duplex), strerror(-r));
380 r = ethtool_set_wol(ctx->ethtool_fd, old_name, config->wol);
382 log_warning("Could not set WakeOnLan of %s to %s: %s",
383 old_name, wol_to_string(config->wol), strerror(-r));
385 ifindex = udev_device_get_ifindex(device);
387 log_warning("Could not find ifindex");
391 if (ctx->enable_name_policy && config->name_policy) {
394 for (policy = config->name_policy; !new_name && *policy != _NAMEPOLICY_INVALID; policy++) {
396 case NAMEPOLICY_ONBOARD:
397 new_name = udev_device_get_property_value(device, "ID_NET_NAME_ONBOARD");
399 case NAMEPOLICY_SLOT:
400 new_name = udev_device_get_property_value(device, "ID_NET_NAME_SLOT");
402 case NAMEPOLICY_PATH:
403 new_name = udev_device_get_property_value(device, "ID_NET_NAME_PATH");
406 new_name = udev_device_get_property_value(device, "ID_NET_NAME_MAC");
415 *name = new_name; /* a name was set by a policy */
416 else if (config->name)
417 *name = config->name; /* a name was set manually in the config */
421 switch (config->mac_policy) {
422 case MACPOLICY_PERSISTENT:
423 if (!mac_is_permanent(device)) {
424 r = get_mac(device, false, &generated_mac);
427 mac = &generated_mac;
430 case MACPOLICY_RANDOM:
431 if (!mac_is_random(device)) {
432 r = get_mac(device, true, &generated_mac);
435 mac = &generated_mac;
442 r = rtnl_set_link_properties(ctx->rtnl, ifindex, config->alias, mac, config->mtu);
444 log_warning("Could not set Alias, MACAddress or MTU on %s: %s", old_name, strerror(-r));
451 static const char* const mac_policy_table[] = {
452 [MACPOLICY_PERSISTENT] = "persistent",
453 [MACPOLICY_RANDOM] = "random"
456 DEFINE_STRING_TABLE_LOOKUP(mac_policy, MACPolicy);
457 DEFINE_CONFIG_PARSE_ENUM(config_parse_mac_policy, mac_policy, MACPolicy, "Failed to parse MAC address policy");
459 static const char* const name_policy_table[] = {
460 [NAMEPOLICY_ONBOARD] = "onboard",
461 [NAMEPOLICY_SLOT] = "slot",
462 [NAMEPOLICY_PATH] = "path",
463 [NAMEPOLICY_MAC] = "mac"
466 DEFINE_STRING_TABLE_LOOKUP(name_policy, NamePolicy);
467 DEFINE_CONFIG_PARSE_ENUMV(config_parse_name_policy, name_policy, NamePolicy, _NAMEPOLICY_INVALID, "Failed to parse interface name policy");