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af6f0d42 TG |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright (C) 2013 Tom Gundersen <teg@jklm.no> | |
7 | ||
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. | |
12 | ||
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. | |
17 | ||
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/>. | |
20 | ***/ | |
21 | ||
43b3a5ef | 22 | #include <netinet/ether.h> |
2a73e0d3 | 23 | #include <net/if.h> |
43b3a5ef | 24 | |
16b9b87a | 25 | #include "sd-id128.h" |
af6f0d42 | 26 | |
16b9b87a | 27 | #include "link-config.h" |
a5010333 TG |
28 | #include "ethtool-util.h" |
29 | ||
43b3a5ef TG |
30 | #include "libudev-private.h" |
31 | #include "sd-rtnl.h" | |
af6f0d42 TG |
32 | #include "util.h" |
33 | #include "log.h" | |
34 | #include "strv.h" | |
35 | #include "path-util.h" | |
36 | #include "conf-parser.h" | |
37 | #include "conf-files.h" | |
daeb71a3 | 38 | #include "fileio.h" |
16b9b87a | 39 | #include "hashmap.h" |
3aeb37bc | 40 | #include "rtnl-util.h" |
be32eb9b | 41 | #include "net-util.h" |
af6f0d42 TG |
42 | |
43 | struct link_config_ctx { | |
44 | LIST_HEAD(link_config, links); | |
45 | ||
a5010333 TG |
46 | int ethtool_fd; |
47 | ||
f6194225 TG |
48 | bool enable_name_policy; |
49 | ||
43b3a5ef TG |
50 | sd_rtnl *rtnl; |
51 | ||
af6f0d42 | 52 | char **link_dirs; |
97f2d76d | 53 | usec_t link_dirs_ts_usec; |
af6f0d42 TG |
54 | }; |
55 | ||
5b9d4dc0 TG |
56 | DEFINE_TRIVIAL_CLEANUP_FUNC(link_config_ctx*, link_config_ctx_free); |
57 | #define _cleanup_link_config_ctx_free_ _cleanup_(link_config_ctx_freep) | |
58 | ||
af6f0d42 | 59 | int link_config_ctx_new(link_config_ctx **ret) { |
5b9d4dc0 | 60 | _cleanup_link_config_ctx_free_ link_config_ctx *ctx = NULL; |
af6f0d42 TG |
61 | |
62 | if (!ret) | |
63 | return -EINVAL; | |
64 | ||
65 | ctx = new0(link_config_ctx, 1); | |
66 | if (!ctx) | |
67 | return -ENOMEM; | |
68 | ||
69 | LIST_HEAD_INIT(ctx->links); | |
70 | ||
97708579 TG |
71 | ctx->ethtool_fd = -1; |
72 | ||
f6194225 TG |
73 | ctx->enable_name_policy = true; |
74 | ||
9dc670ea TG |
75 | ctx->link_dirs = strv_new("/etc/systemd/network", |
76 | "/run/systemd/network", | |
77 | "/usr/lib/systemd/network", | |
c50e28a3 DR |
78 | #ifdef HAVE_SPLIT_USR |
79 | "/lib/systemd/network", | |
80 | #endif | |
af6f0d42 TG |
81 | NULL); |
82 | if (!ctx->link_dirs) { | |
83 | log_error("failed to build link config directory array"); | |
af6f0d42 TG |
84 | return -ENOMEM; |
85 | } | |
5b9d4dc0 | 86 | |
af6f0d42 TG |
87 | if (!path_strv_canonicalize_uniq(ctx->link_dirs)) { |
88 | log_error("failed to canonicalize link config directories\n"); | |
af6f0d42 TG |
89 | return -ENOMEM; |
90 | } | |
91 | ||
af6f0d42 | 92 | *ret = ctx; |
5b9d4dc0 TG |
93 | ctx = NULL; |
94 | ||
af6f0d42 TG |
95 | return 0; |
96 | } | |
97 | ||
97708579 TG |
98 | static int link_config_ctx_connect(link_config_ctx *ctx) { |
99 | int r; | |
100 | ||
101 | if (ctx->ethtool_fd >= 0 && ctx->rtnl) | |
102 | return 0; | |
103 | ||
104 | r = ethtool_connect(&ctx->ethtool_fd); | |
105 | if (r < 0) | |
106 | return r; | |
107 | ||
108 | r = sd_rtnl_open(0, &ctx->rtnl); | |
109 | if (r < 0) | |
110 | return r; | |
111 | ||
112 | return 0; | |
113 | } | |
114 | ||
af6f0d42 TG |
115 | static void link_configs_free(link_config_ctx *ctx) { |
116 | link_config *link, *link_next; | |
117 | ||
118 | if (!ctx) | |
119 | return; | |
120 | ||
121 | LIST_FOREACH_SAFE(links, link, link_next, ctx->links) { | |
122 | free(link->filename); | |
123 | free(link->match_path); | |
124 | free(link->match_driver); | |
125 | free(link->match_type); | |
126 | free(link->description); | |
d2df0d0e | 127 | free(link->alias); |
af6f0d42 TG |
128 | |
129 | free(link); | |
130 | } | |
131 | } | |
132 | ||
133 | void link_config_ctx_free(link_config_ctx *ctx) { | |
134 | if (!ctx) | |
135 | return; | |
136 | ||
43b3a5ef TG |
137 | if (ctx->ethtool_fd >= 0) |
138 | close_nointr_nofail(ctx->ethtool_fd); | |
139 | ||
140 | sd_rtnl_unref(ctx->rtnl); | |
141 | ||
af6f0d42 | 142 | strv_free(ctx->link_dirs); |
af6f0d42 TG |
143 | link_configs_free(ctx); |
144 | ||
145 | free(ctx); | |
146 | ||
147 | return; | |
148 | } | |
149 | ||
150 | static int load_link(link_config_ctx *ctx, const char *filename) { | |
151 | link_config *link; | |
2fd069b1 | 152 | _cleanup_fclose_ FILE *file; |
af6f0d42 TG |
153 | int r; |
154 | ||
155 | file = fopen(filename, "re"); | |
156 | if (!file) { | |
157 | if (errno == ENOENT) | |
158 | return 0; | |
159 | else | |
160 | return errno; | |
161 | } | |
162 | ||
163 | link = new0(link_config, 1); | |
164 | if (!link) { | |
165 | r = log_oom(); | |
166 | goto failure; | |
167 | } | |
168 | ||
5fde13d7 TG |
169 | link->mac_policy = _MACPOLICY_INVALID; |
170 | link->wol = _WOL_INVALID; | |
171 | link->duplex = _DUP_INVALID; | |
172 | ||
af6f0d42 TG |
173 | r = config_parse(NULL, filename, file, "Match\0Link\0Ethernet\0", config_item_perf_lookup, |
174 | (void*) link_config_gperf_lookup, false, false, link); | |
175 | if (r < 0) { | |
48912436 | 176 | log_warning("Could not parse config file %s: %s", filename, strerror(-r)); |
af6f0d42 TG |
177 | goto failure; |
178 | } else | |
98a375f6 | 179 | log_debug("Parsed configuration file %s", filename); |
af6f0d42 TG |
180 | |
181 | link->filename = strdup(filename); | |
182 | ||
183 | LIST_PREPEND(links, ctx->links, link); | |
184 | ||
185 | return 0; | |
186 | ||
187 | failure: | |
188 | free(link); | |
189 | return r; | |
190 | } | |
191 | ||
f6194225 TG |
192 | static bool enable_name_policy(void) { |
193 | _cleanup_free_ char *line; | |
194 | char *w, *state; | |
195 | int r; | |
196 | size_t l; | |
197 | ||
74df0fca LP |
198 | r = proc_cmdline(&line); |
199 | if (r < 0) | |
f6194225 | 200 | log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r)); |
74df0fca LP |
201 | if (r <= 0) |
202 | return true; | |
f6194225 TG |
203 | |
204 | FOREACH_WORD_QUOTED(w, l, line, state) | |
ff83aac3 | 205 | if (strneq(w, "net.ifnames=0", l)) |
f6194225 TG |
206 | return false; |
207 | ||
208 | return true; | |
209 | } | |
210 | ||
af6f0d42 TG |
211 | int link_config_load(link_config_ctx *ctx) { |
212 | int r; | |
213 | char **files, **f; | |
214 | ||
215 | link_configs_free(ctx); | |
216 | ||
f6194225 TG |
217 | if (!enable_name_policy()) { |
218 | ctx->enable_name_policy = false; | |
219 | log_info("Network interface NamePolicy= disabled on kernel commandline, ignoring."); | |
220 | } | |
221 | ||
97f2d76d TG |
222 | /* update timestamp */ |
223 | paths_check_timestamp(ctx->link_dirs, &ctx->link_dirs_ts_usec, true); | |
af6f0d42 TG |
224 | |
225 | r = conf_files_list_strv(&files, ".link", NULL, (const char **)ctx->link_dirs); | |
226 | if (r < 0) { | |
227 | log_error("failed to enumerate link files: %s", strerror(-r)); | |
228 | return r; | |
229 | } | |
230 | ||
231 | STRV_FOREACH_BACKWARDS(f, files) { | |
232 | r = load_link(ctx, *f); | |
233 | if (r < 0) | |
234 | return r; | |
235 | } | |
236 | ||
237 | return 0; | |
238 | } | |
239 | ||
240 | bool link_config_should_reload(link_config_ctx *ctx) { | |
97f2d76d | 241 | return paths_check_timestamp(ctx->link_dirs, &ctx->link_dirs_ts_usec, false); |
af6f0d42 TG |
242 | } |
243 | ||
af6f0d42 TG |
244 | int link_config_get(link_config_ctx *ctx, struct udev_device *device, link_config **ret) { |
245 | link_config *link; | |
246 | ||
247 | LIST_FOREACH(links, link, ctx->links) { | |
b3e01314 | 248 | |
be32eb9b | 249 | if (net_match_config(link->match_mac, link->match_path, |
b3e01314 TG |
250 | link->match_driver, link->match_type, NULL, |
251 | udev_device_get_sysattr_value(device, "address"), | |
252 | udev_device_get_property_value(device, "ID_PATH"), | |
253 | udev_device_get_driver(device), | |
254 | udev_device_get_devtype(device), | |
255 | NULL)) { | |
be32eb9b TG |
256 | log_debug("Config file %s applies to device %s", |
257 | link->filename, | |
258 | udev_device_get_sysname(device)); | |
af6f0d42 TG |
259 | *ret = link; |
260 | return 0; | |
261 | } | |
262 | } | |
263 | ||
be32eb9b TG |
264 | *ret = NULL; |
265 | ||
af6f0d42 TG |
266 | return -ENOENT; |
267 | } | |
268 | ||
16b9b87a TG |
269 | static bool mac_is_random(struct udev_device *device) { |
270 | const char *s; | |
f1ac7002 TG |
271 | unsigned type; |
272 | int r; | |
16b9b87a TG |
273 | |
274 | s = udev_device_get_sysattr_value(device, "addr_assign_type"); | |
275 | if (!s) | |
f1ac7002 TG |
276 | return false; /* if we don't know, assume it is not random */ |
277 | r = safe_atou(s, &type); | |
278 | if (r < 0) | |
279 | return false; | |
16b9b87a TG |
280 | |
281 | /* check for NET_ADDR_RANDOM */ | |
282 | return type == 1; | |
283 | } | |
284 | ||
285 | static bool mac_is_permanent(struct udev_device *device) { | |
286 | const char *s; | |
f1ac7002 TG |
287 | unsigned type; |
288 | int r; | |
16b9b87a TG |
289 | |
290 | s = udev_device_get_sysattr_value(device, "addr_assign_type"); | |
291 | if (!s) | |
f1ac7002 TG |
292 | return true; /* if we don't know, assume it is permanent */ |
293 | r = safe_atou(s, &type); | |
294 | if (r < 0) | |
295 | return true; | |
16b9b87a TG |
296 | |
297 | /* check for NET_ADDR_PERM */ | |
298 | return type == 0; | |
299 | } | |
300 | ||
5fde13d7 | 301 | static int get_mac(struct udev_device *device, bool want_random, struct ether_addr *mac) { |
16b9b87a TG |
302 | unsigned int seed; |
303 | int r, i; | |
304 | ||
16b9b87a TG |
305 | if (want_random) |
306 | seed = random_u(); | |
307 | else { | |
308 | const char *name; | |
309 | sd_id128_t machine; | |
310 | char machineid_buf[33]; | |
311 | const char *seed_str; | |
312 | ||
313 | /* fetch some persistent data unique (on this machine) to this device */ | |
314 | name = udev_device_get_property_value(device, "ID_NET_NAME_ONBOARD"); | |
315 | if (!name) { | |
316 | name = udev_device_get_property_value(device, "ID_NET_NAME_SLOT"); | |
317 | if (!name) { | |
318 | name = udev_device_get_property_value(device, "ID_NET_NAME_PATH"); | |
319 | if (!name) | |
55428d84 | 320 | return -ENOENT; |
16b9b87a TG |
321 | } |
322 | } | |
323 | /* fetch some persistent data unique to this machine */ | |
324 | r = sd_id128_get_machine(&machine); | |
325 | if (r < 0) | |
55428d84 | 326 | return r; |
16b9b87a TG |
327 | |
328 | /* combine the data */ | |
329 | seed_str = strappenda(name, sd_id128_to_string(machine, machineid_buf)); | |
330 | ||
331 | /* hash to get seed */ | |
332 | seed = string_hash_func(seed_str); | |
333 | } | |
334 | ||
335 | srandom(seed); | |
336 | ||
f168c273 | 337 | for (i = 0; i < ETH_ALEN; i++) { |
16b9b87a TG |
338 | mac->ether_addr_octet[i] = random(); |
339 | } | |
340 | ||
341 | /* see eth_random_addr in the kernel */ | |
342 | mac->ether_addr_octet[0] &= 0xfe; /* clear multicast bit */ | |
343 | mac->ether_addr_octet[0] |= 0x02; /* set local assignment bit (IEEE802) */ | |
344 | ||
16b9b87a TG |
345 | return 0; |
346 | } | |
347 | ||
3e137a1b TG |
348 | int link_config_apply(link_config_ctx *ctx, link_config *config, struct udev_device *device, const char **name) { |
349 | const char *old_name; | |
5fde13d7 TG |
350 | const char *new_name = NULL; |
351 | struct ether_addr generated_mac; | |
16b9b87a | 352 | struct ether_addr *mac = NULL; |
43b3a5ef | 353 | int r, ifindex; |
af6f0d42 | 354 | |
3e137a1b TG |
355 | assert(ctx); |
356 | assert(config); | |
357 | assert(device); | |
358 | assert(name); | |
359 | ||
97708579 TG |
360 | r = link_config_ctx_connect(ctx); |
361 | if (r < 0) | |
362 | return r; | |
363 | ||
3e137a1b TG |
364 | old_name = udev_device_get_sysname(device); |
365 | if (!old_name) | |
af6f0d42 TG |
366 | return -EINVAL; |
367 | ||
3e137a1b | 368 | r = ethtool_set_speed(ctx->ethtool_fd, old_name, config->speed, config->duplex); |
5fde13d7 TG |
369 | if (r < 0) |
370 | log_warning("Could not set speed or duplex of %s to %u Mbytes (%s): %s", | |
3e137a1b | 371 | old_name, config->speed, duplex_to_string(config->duplex), strerror(-r)); |
a5010333 | 372 | |
3e137a1b | 373 | r = ethtool_set_wol(ctx->ethtool_fd, old_name, config->wol); |
5fde13d7 TG |
374 | if (r < 0) |
375 | log_warning("Could not set WakeOnLan of %s to %s: %s", | |
3e137a1b | 376 | old_name, wol_to_string(config->wol), strerror(-r)); |
af6f0d42 | 377 | |
43b3a5ef TG |
378 | ifindex = udev_device_get_ifindex(device); |
379 | if (ifindex <= 0) { | |
380 | log_warning("Could not find ifindex"); | |
381 | return -ENODEV; | |
382 | } | |
383 | ||
f6194225 | 384 | if (ctx->enable_name_policy && config->name_policy) { |
5fde13d7 | 385 | NamePolicy *policy; |
daeb71a3 | 386 | |
5fde13d7 TG |
387 | for (policy = config->name_policy; !new_name && *policy != _NAMEPOLICY_INVALID; policy++) { |
388 | switch (*policy) { | |
389 | case NAMEPOLICY_ONBOARD: | |
390 | new_name = udev_device_get_property_value(device, "ID_NET_NAME_ONBOARD"); | |
daeb71a3 | 391 | break; |
5fde13d7 TG |
392 | case NAMEPOLICY_SLOT: |
393 | new_name = udev_device_get_property_value(device, "ID_NET_NAME_SLOT"); | |
daeb71a3 | 394 | break; |
5fde13d7 TG |
395 | case NAMEPOLICY_PATH: |
396 | new_name = udev_device_get_property_value(device, "ID_NET_NAME_PATH"); | |
daeb71a3 | 397 | break; |
5fde13d7 TG |
398 | case NAMEPOLICY_MAC: |
399 | new_name = udev_device_get_property_value(device, "ID_NET_NAME_MAC"); | |
daeb71a3 | 400 | break; |
5fde13d7 TG |
401 | default: |
402 | break; | |
403 | } | |
daeb71a3 TG |
404 | } |
405 | } | |
406 | ||
3e137a1b TG |
407 | if (new_name) |
408 | *name = new_name; /* a name was set by a policy */ | |
409 | else if (config->name) | |
410 | *name = config->name; /* a name was set manually in the config */ | |
411 | else | |
412 | *name = NULL; | |
daeb71a3 | 413 | |
5fde13d7 TG |
414 | switch (config->mac_policy) { |
415 | case MACPOLICY_PERSISTENT: | |
16b9b87a | 416 | if (!mac_is_permanent(device)) { |
5fde13d7 | 417 | r = get_mac(device, false, &generated_mac); |
16b9b87a TG |
418 | if (r < 0) |
419 | return r; | |
5fde13d7 | 420 | mac = &generated_mac; |
16b9b87a | 421 | } |
5fde13d7 TG |
422 | break; |
423 | case MACPOLICY_RANDOM: | |
16b9b87a | 424 | if (!mac_is_random(device)) { |
5fde13d7 | 425 | r = get_mac(device, true, &generated_mac); |
16b9b87a TG |
426 | if (r < 0) |
427 | return r; | |
5fde13d7 | 428 | mac = &generated_mac; |
16b9b87a | 429 | } |
5fde13d7 TG |
430 | break; |
431 | default: | |
432 | mac = config->mac; | |
16b9b87a TG |
433 | } |
434 | ||
d2df0d0e | 435 | r = rtnl_set_link_properties(ctx->rtnl, ifindex, config->alias, mac, config->mtu); |
43b3a5ef | 436 | if (r < 0) { |
d2df0d0e | 437 | log_warning("Could not set Alias, MACAddress or MTU on %s: %s", old_name, strerror(-r)); |
5fde13d7 | 438 | return r; |
43b3a5ef TG |
439 | } |
440 | ||
af6f0d42 TG |
441 | return 0; |
442 | } | |
be32eb9b TG |
443 | |
444 | static const char* const mac_policy_table[] = { | |
445 | [MACPOLICY_PERSISTENT] = "persistent", | |
446 | [MACPOLICY_RANDOM] = "random" | |
447 | }; | |
448 | ||
449 | DEFINE_STRING_TABLE_LOOKUP(mac_policy, MACPolicy); | |
450 | DEFINE_CONFIG_PARSE_ENUM(config_parse_mac_policy, mac_policy, MACPolicy, "Failed to parse MAC address policy"); | |
451 | ||
452 | static const char* const name_policy_table[] = { | |
453 | [NAMEPOLICY_ONBOARD] = "onboard", | |
454 | [NAMEPOLICY_SLOT] = "slot", | |
455 | [NAMEPOLICY_PATH] = "path", | |
456 | [NAMEPOLICY_MAC] = "mac" | |
457 | }; | |
458 | ||
459 | DEFINE_STRING_TABLE_LOOKUP(name_policy, NamePolicy); | |
460 | DEFINE_CONFIG_PARSE_ENUMV(config_parse_name_policy, name_policy, NamePolicy, _NAMEPOLICY_INVALID, "Failed to parse interface name policy"); |