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 struct link_config_ctx {
43 LIST_HEAD(link_config, links);
47 bool enable_name_policy;
52 usec_t link_dirs_ts_usec;
55 DEFINE_TRIVIAL_CLEANUP_FUNC(link_config_ctx*, link_config_ctx_free);
56 #define _cleanup_link_config_ctx_free_ _cleanup_(link_config_ctx_freep)
58 int link_config_ctx_new(link_config_ctx **ret) {
59 _cleanup_link_config_ctx_free_ link_config_ctx *ctx = NULL;
64 ctx = new0(link_config_ctx, 1);
68 LIST_HEAD_INIT(ctx->links);
72 ctx->enable_name_policy = true;
74 ctx->link_dirs = strv_new("/etc/systemd/network",
75 "/run/systemd/network",
76 "/usr/lib/systemd/network",
78 if (!ctx->link_dirs) {
79 log_error("failed to build link config directory array");
83 if (!path_strv_canonicalize_uniq(ctx->link_dirs)) {
84 log_error("failed to canonicalize link config directories\n");
94 static int link_config_ctx_connect(link_config_ctx *ctx) {
97 if (ctx->ethtool_fd >= 0 && ctx->rtnl)
100 r = ethtool_connect(&ctx->ethtool_fd);
104 r = sd_rtnl_open(0, &ctx->rtnl);
111 static void link_configs_free(link_config_ctx *ctx) {
112 link_config *link, *link_next;
117 LIST_FOREACH_SAFE(links, link, link_next, ctx->links) {
118 free(link->filename);
119 free(link->match_path);
120 free(link->match_driver);
121 free(link->match_type);
122 free(link->description);
128 void link_config_ctx_free(link_config_ctx *ctx) {
132 if (ctx->ethtool_fd >= 0)
133 close_nointr_nofail(ctx->ethtool_fd);
135 sd_rtnl_unref(ctx->rtnl);
137 strv_free(ctx->link_dirs);
138 link_configs_free(ctx);
145 static int load_link(link_config_ctx *ctx, const char *filename) {
150 file = fopen(filename, "re");
158 link = new0(link_config, 1);
164 link->mac_policy = _MACPOLICY_INVALID;
165 link->wol = _WOL_INVALID;
166 link->duplex = _DUP_INVALID;
169 r = config_parse(NULL, filename, file, "Match\0Link\0Ethernet\0", config_item_perf_lookup,
170 (void*) link_config_gperf_lookup, false, false, link);
172 log_warning("Colud not parse config file %s: %s", filename, strerror(-r));
175 log_debug("Parsed configuration file %s", filename);
177 link->filename = strdup(filename);
179 LIST_PREPEND(links, ctx->links, link);
188 static bool enable_name_policy(void) {
189 _cleanup_free_ char *line;
194 r = read_one_line_file("/proc/cmdline", &line);
196 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
197 return true; /* something is very wrong, let's not make it worse */
200 FOREACH_WORD_QUOTED(w, l, line, state)
201 if (strneq(w, "net.ifnames=0", l))
207 int link_config_load(link_config_ctx *ctx) {
211 link_configs_free(ctx);
214 if (!enable_name_policy()) {
215 ctx->enable_name_policy = false;
216 log_info("Network interface NamePolicy= disabled on kernel commandline, ignoring.");
219 /* update timestamp */
220 paths_check_timestamp(ctx->link_dirs, &ctx->link_dirs_ts_usec, true);
222 r = conf_files_list_strv(&files, ".link", NULL, (const char **)ctx->link_dirs);
224 log_error("failed to enumerate link files: %s", strerror(-r));
228 STRV_FOREACH_BACKWARDS(f, files) {
229 r = load_link(ctx, *f);
237 bool link_config_should_reload(link_config_ctx *ctx) {
238 return paths_check_timestamp(ctx->link_dirs, &ctx->link_dirs_ts_usec, false);
241 static bool match_config(link_config *match, struct udev_device *device) {
242 const char *property;
244 if (match->match_mac) {
245 property = udev_device_get_sysattr_value(device, "address");
246 if (!property || memcmp(match->match_mac, ether_aton(property), ETH_ALEN)) {
247 log_debug("Device MAC address (%s) did not match MACAddress=%s",
248 property, ether_ntoa(match->match_mac));
253 if (match->match_path) {
254 property = udev_device_get_property_value(device, "ID_PATH");
255 if (!streq_ptr(match->match_path, property)) {
256 log_debug("Device's persistent path (%s) did not match Path=%s",
257 property, match->match_path);
262 if (match->match_driver) {
263 property = udev_device_get_driver(device);
264 if (!streq_ptr(match->match_driver, property)) {
265 log_debug("Device driver (%s) did not match Driver=%s",
266 property, match->match_driver);
271 if (match->match_type) {
272 property = udev_device_get_devtype(device);
273 if (!streq_ptr(match->match_type, property)) {
274 log_debug("Device type (%s) did not match Type=%s",
275 property, match->match_type);
283 int link_config_get(link_config_ctx *ctx, struct udev_device *device, link_config **ret) {
286 LIST_FOREACH(links, link, ctx->links) {
287 if (match_config(link, device)) {
288 log_debug("Config file %s applies to device %s", link->filename, udev_device_get_sysname(device));
297 static bool mac_is_random(struct udev_device *device) {
302 s = udev_device_get_sysattr_value(device, "addr_assign_type");
304 return false; /* if we don't know, assume it is not random */
305 r = safe_atou(s, &type);
309 /* check for NET_ADDR_RANDOM */
313 static bool mac_is_permanent(struct udev_device *device) {
318 s = udev_device_get_sysattr_value(device, "addr_assign_type");
320 return true; /* if we don't know, assume it is permanent */
321 r = safe_atou(s, &type);
325 /* check for NET_ADDR_PERM */
329 static int get_mac(struct udev_device *device, bool want_random, struct ether_addr *mac) {
338 char machineid_buf[33];
339 const char *seed_str;
341 /* fetch some persistent data unique (on this machine) to this device */
342 name = udev_device_get_property_value(device, "ID_NET_NAME_ONBOARD");
344 name = udev_device_get_property_value(device, "ID_NET_NAME_SLOT");
346 name = udev_device_get_property_value(device, "ID_NET_NAME_PATH");
351 /* fetch some persistent data unique to this machine */
352 r = sd_id128_get_machine(&machine);
356 /* combine the data */
357 seed_str = strappenda(name, sd_id128_to_string(machine, machineid_buf));
359 /* hash to get seed */
360 seed = string_hash_func(seed_str);
365 for(i = 0; i < ETH_ALEN; i++) {
366 mac->ether_addr_octet[i] = random();
369 /* see eth_random_addr in the kernel */
370 mac->ether_addr_octet[0] &= 0xfe; /* clear multicast bit */
371 mac->ether_addr_octet[0] |= 0x02; /* set local assignment bit (IEEE802) */
376 int link_config_apply(link_config_ctx *ctx, link_config *config, struct udev_device *device, const char **name) {
377 const char *old_name;
378 const char *new_name = NULL;
379 struct ether_addr generated_mac;
380 struct ether_addr *mac = NULL;
388 r = link_config_ctx_connect(ctx);
392 old_name = udev_device_get_sysname(device);
396 if (config->description) {
397 r = udev_device_set_sysattr_value(device, "ifalias",
398 config->description);
400 log_warning("Could not set description of %s to '%s': %s",
401 old_name, config->description, strerror(-r));
404 r = ethtool_set_speed(ctx->ethtool_fd, old_name, config->speed, config->duplex);
406 log_warning("Could not set speed or duplex of %s to %u Mbytes (%s): %s",
407 old_name, config->speed, duplex_to_string(config->duplex), strerror(-r));
409 r = ethtool_set_wol(ctx->ethtool_fd, old_name, config->wol);
411 log_warning("Could not set WakeOnLan of %s to %s: %s",
412 old_name, wol_to_string(config->wol), strerror(-r));
414 ifindex = udev_device_get_ifindex(device);
416 log_warning("Could not find ifindex");
420 if (ctx->enable_name_policy && config->name_policy) {
423 for (policy = config->name_policy; !new_name && *policy != _NAMEPOLICY_INVALID; policy++) {
425 case NAMEPOLICY_ONBOARD:
426 new_name = udev_device_get_property_value(device, "ID_NET_NAME_ONBOARD");
428 case NAMEPOLICY_SLOT:
429 new_name = udev_device_get_property_value(device, "ID_NET_NAME_SLOT");
431 case NAMEPOLICY_PATH:
432 new_name = udev_device_get_property_value(device, "ID_NET_NAME_PATH");
435 new_name = udev_device_get_property_value(device, "ID_NET_NAME_MAC");
444 *name = new_name; /* a name was set by a policy */
445 else if (config->name)
446 *name = config->name; /* a name was set manually in the config */
450 switch (config->mac_policy) {
451 case MACPOLICY_PERSISTENT:
452 if (!mac_is_permanent(device)) {
453 r = get_mac(device, false, &generated_mac);
456 mac = &generated_mac;
459 case MACPOLICY_RANDOM:
460 if (!mac_is_random(device)) {
461 r = get_mac(device, true, &generated_mac);
464 mac = &generated_mac;
471 r = rtnl_set_link_properties(ctx->rtnl, ifindex, mac, config->mtu);
473 log_warning("Could not set MACAddress or MTU on %s: %s", old_name, strerror(-r));