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);
50 usec_t link_dirs_ts_usec;
53 DEFINE_TRIVIAL_CLEANUP_FUNC(link_config_ctx*, link_config_ctx_free);
54 #define _cleanup_link_config_ctx_free_ _cleanup_(link_config_ctx_freep)
56 int link_config_ctx_new(link_config_ctx **ret) {
57 _cleanup_link_config_ctx_free_ link_config_ctx *ctx = NULL;
62 ctx = new0(link_config_ctx, 1);
66 LIST_HEAD_INIT(ctx->links);
70 ctx->link_dirs = strv_new("/etc/systemd/network",
71 "/run/systemd/network",
72 "/usr/lib/systemd/network",
74 if (!ctx->link_dirs) {
75 log_error("failed to build link config directory array");
79 if (!path_strv_canonicalize_uniq(ctx->link_dirs)) {
80 log_error("failed to canonicalize link config directories\n");
90 static int link_config_ctx_connect(link_config_ctx *ctx) {
93 if (ctx->ethtool_fd >= 0 && ctx->rtnl)
96 r = ethtool_connect(&ctx->ethtool_fd);
100 r = sd_rtnl_open(0, &ctx->rtnl);
107 static void link_configs_free(link_config_ctx *ctx) {
108 link_config *link, *link_next;
113 LIST_FOREACH_SAFE(links, link, link_next, ctx->links) {
114 free(link->filename);
115 free(link->match_path);
116 free(link->match_driver);
117 free(link->match_type);
118 free(link->description);
124 void link_config_ctx_free(link_config_ctx *ctx) {
128 if (ctx->ethtool_fd >= 0)
129 close_nointr_nofail(ctx->ethtool_fd);
131 sd_rtnl_unref(ctx->rtnl);
133 strv_free(ctx->link_dirs);
134 link_configs_free(ctx);
141 static int load_link(link_config_ctx *ctx, const char *filename) {
146 file = fopen(filename, "re");
154 link = new0(link_config, 1);
160 link->mac_policy = _MACPOLICY_INVALID;
161 link->wol = _WOL_INVALID;
162 link->duplex = _DUP_INVALID;
165 r = config_parse(NULL, filename, file, "Match\0Link\0Ethernet\0", config_item_perf_lookup,
166 (void*) link_config_gperf_lookup, false, false, link);
168 log_warning("Colud not parse config file %s: %s", filename, strerror(-r));
171 log_info("Parsed configuration file %s", filename);
173 link->filename = strdup(filename);
175 LIST_PREPEND(links, ctx->links, link);
184 int link_config_load(link_config_ctx *ctx) {
188 link_configs_free(ctx);
190 /* update timestamp */
191 paths_check_timestamp(ctx->link_dirs, &ctx->link_dirs_ts_usec, true);
193 r = conf_files_list_strv(&files, ".link", NULL, (const char **)ctx->link_dirs);
195 log_error("failed to enumerate link files: %s", strerror(-r));
199 STRV_FOREACH_BACKWARDS(f, files) {
200 r = load_link(ctx, *f);
208 bool link_config_should_reload(link_config_ctx *ctx) {
209 return paths_check_timestamp(ctx->link_dirs, &ctx->link_dirs_ts_usec, false);
212 static bool match_config(link_config *match, struct udev_device *device) {
213 const char *property;
215 if (match->match_mac) {
216 property = udev_device_get_sysattr_value(device, "address");
217 if (!property || memcmp(match->match_mac, ether_aton(property), ETH_ALEN)) {
218 log_debug("Device MAC address (%s) did not match MACAddress=%s",
219 property, ether_ntoa(match->match_mac));
224 if (match->match_path) {
225 property = udev_device_get_property_value(device, "ID_PATH");
226 if (!streq_ptr(match->match_path, property)) {
227 log_debug("Device's persistent path (%s) did not match Path=%s",
228 property, match->match_path);
233 if (match->match_driver) {
234 property = udev_device_get_driver(device);
235 if (!streq_ptr(match->match_driver, property)) {
236 log_debug("Device driver (%s) did not match Driver=%s",
237 property, match->match_driver);
242 if (match->match_type) {
243 property = udev_device_get_devtype(device);
244 if (!streq_ptr(match->match_type, property)) {
245 log_debug("Device type (%s) did not match Type=%s",
246 property, match->match_type);
254 int link_config_get(link_config_ctx *ctx, struct udev_device *device, link_config **ret) {
257 LIST_FOREACH(links, link, ctx->links) {
258 if (!match_config(link, device)) {
259 log_info("Config file %s does not apply to device %s", link->filename, udev_device_get_sysname(device));
261 log_info("Config file %s applies to device %s", link->filename, udev_device_get_sysname(device));
270 static bool enable_name_policy(void) {
271 _cleanup_free_ char *line;
276 r = read_one_line_file("/proc/cmdline", &line);
278 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
279 return true; /* something is very wrong, let's not make it worse */
282 FOREACH_WORD_QUOTED(w, l, line, state)
283 if (strneq(w, "net.ifnames=0", l)) {
284 log_info("Link name policy disabled on kernel commandline, ignoring.");
291 static bool mac_is_random(struct udev_device *device) {
296 s = udev_device_get_sysattr_value(device, "addr_assign_type");
298 return false; /* if we don't know, assume it is not random */
299 r = safe_atou(s, &type);
303 /* check for NET_ADDR_RANDOM */
307 static bool mac_is_permanent(struct udev_device *device) {
312 s = udev_device_get_sysattr_value(device, "addr_assign_type");
314 return true; /* if we don't know, assume it is permanent */
315 r = safe_atou(s, &type);
319 /* check for NET_ADDR_PERM */
323 static int get_mac(struct udev_device *device, bool want_random, struct ether_addr *mac) {
332 char machineid_buf[33];
333 const char *seed_str;
335 /* fetch some persistent data unique (on this machine) to this device */
336 name = udev_device_get_property_value(device, "ID_NET_NAME_ONBOARD");
338 name = udev_device_get_property_value(device, "ID_NET_NAME_SLOT");
340 name = udev_device_get_property_value(device, "ID_NET_NAME_PATH");
345 /* fetch some persistent data unique to this machine */
346 r = sd_id128_get_machine(&machine);
350 /* combine the data */
351 seed_str = strappenda(name, sd_id128_to_string(machine, machineid_buf));
353 /* hash to get seed */
354 seed = string_hash_func(seed_str);
359 for(i = 0; i < ETH_ALEN; i++) {
360 mac->ether_addr_octet[i] = random();
363 /* see eth_random_addr in the kernel */
364 mac->ether_addr_octet[0] &= 0xfe; /* clear multicast bit */
365 mac->ether_addr_octet[0] |= 0x02; /* set local assignment bit (IEEE802) */
370 int link_config_apply(link_config_ctx *ctx, link_config *config, struct udev_device *device, const char **name) {
371 const char *old_name;
372 const char *new_name = NULL;
373 struct ether_addr generated_mac;
374 struct ether_addr *mac = NULL;
382 r = link_config_ctx_connect(ctx);
386 old_name = udev_device_get_sysname(device);
390 log_info("Configuring %s", old_name);
392 if (config->description) {
393 r = udev_device_set_sysattr_value(device, "ifalias",
394 config->description);
396 log_warning("Could not set description of %s to '%s': %s",
397 old_name, config->description, strerror(-r));
400 r = ethtool_set_speed(ctx->ethtool_fd, old_name, config->speed, config->duplex);
402 log_warning("Could not set speed or duplex of %s to %u Mbytes (%s): %s",
403 old_name, config->speed, duplex_to_string(config->duplex), strerror(-r));
405 r = ethtool_set_wol(ctx->ethtool_fd, old_name, config->wol);
407 log_warning("Could not set WakeOnLan of %s to %s: %s",
408 old_name, wol_to_string(config->wol), strerror(-r));
410 ifindex = udev_device_get_ifindex(device);
412 log_warning("Could not find ifindex");
416 if (config->name_policy && enable_name_policy()) {
419 for (policy = config->name_policy; !new_name && *policy != _NAMEPOLICY_INVALID; policy++) {
421 case NAMEPOLICY_ONBOARD:
422 new_name = udev_device_get_property_value(device, "ID_NET_NAME_ONBOARD");
424 case NAMEPOLICY_SLOT:
425 new_name = udev_device_get_property_value(device, "ID_NET_NAME_SLOT");
427 case NAMEPOLICY_PATH:
428 new_name = udev_device_get_property_value(device, "ID_NET_NAME_PATH");
431 new_name = udev_device_get_property_value(device, "ID_NET_NAME_MAC");
440 *name = new_name; /* a name was set by a policy */
441 else if (config->name)
442 *name = config->name; /* a name was set manually in the config */
446 switch (config->mac_policy) {
447 case MACPOLICY_PERSISTENT:
448 if (!mac_is_permanent(device)) {
449 r = get_mac(device, false, &generated_mac);
452 mac = &generated_mac;
455 case MACPOLICY_RANDOM:
456 if (!mac_is_random(device)) {
457 r = get_mac(device, true, &generated_mac);
460 mac = &generated_mac;
467 r = rtnl_set_link_properties(ctx->rtnl, ifindex, mac, config->mtu);
469 log_warning("Could not set MACAddress or MTU on %s: %s", old_name, strerror(-r));