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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> |
04b67d49 | 23 | #include <linux/netdevice.h> |
43b3a5ef | 24 | |
16b9b87a | 25 | #include "sd-id128.h" |
af6f0d42 | 26 | |
04b67d49 | 27 | #include "missing.h" |
16b9b87a | 28 | #include "link-config.h" |
a5010333 TG |
29 | #include "ethtool-util.h" |
30 | ||
43b3a5ef TG |
31 | #include "libudev-private.h" |
32 | #include "sd-rtnl.h" | |
af6f0d42 TG |
33 | #include "util.h" |
34 | #include "log.h" | |
35 | #include "strv.h" | |
36 | #include "path-util.h" | |
37 | #include "conf-parser.h" | |
38 | #include "conf-files.h" | |
daeb71a3 | 39 | #include "fileio.h" |
16b9b87a | 40 | #include "hashmap.h" |
3aeb37bc | 41 | #include "rtnl-util.h" |
c6f7c917 | 42 | #include "network-internal.h" |
9bf3b535 | 43 | #include "siphash24.h" |
af6f0d42 TG |
44 | |
45 | struct link_config_ctx { | |
46 | LIST_HEAD(link_config, links); | |
47 | ||
a5010333 TG |
48 | int ethtool_fd; |
49 | ||
f6194225 TG |
50 | bool enable_name_policy; |
51 | ||
43b3a5ef TG |
52 | sd_rtnl *rtnl; |
53 | ||
97f2d76d | 54 | usec_t link_dirs_ts_usec; |
af6f0d42 TG |
55 | }; |
56 | ||
2ad8416d ZJS |
57 | static const char* const link_dirs[] = { |
58 | "/etc/systemd/network", | |
59 | "/run/systemd/network", | |
60 | "/usr/lib/systemd/network", | |
61 | #ifdef HAVE_SPLIT_USR | |
62 | "/lib/systemd/network", | |
63 | #endif | |
64 | NULL}; | |
65 | ||
5b9d4dc0 TG |
66 | DEFINE_TRIVIAL_CLEANUP_FUNC(link_config_ctx*, link_config_ctx_free); |
67 | #define _cleanup_link_config_ctx_free_ _cleanup_(link_config_ctx_freep) | |
68 | ||
af6f0d42 | 69 | int link_config_ctx_new(link_config_ctx **ret) { |
5b9d4dc0 | 70 | _cleanup_link_config_ctx_free_ link_config_ctx *ctx = NULL; |
af6f0d42 TG |
71 | |
72 | if (!ret) | |
73 | return -EINVAL; | |
74 | ||
75 | ctx = new0(link_config_ctx, 1); | |
76 | if (!ctx) | |
77 | return -ENOMEM; | |
78 | ||
79 | LIST_HEAD_INIT(ctx->links); | |
80 | ||
97708579 TG |
81 | ctx->ethtool_fd = -1; |
82 | ||
f6194225 TG |
83 | ctx->enable_name_policy = true; |
84 | ||
af6f0d42 | 85 | *ret = ctx; |
5b9d4dc0 TG |
86 | ctx = NULL; |
87 | ||
af6f0d42 TG |
88 | return 0; |
89 | } | |
90 | ||
97708579 TG |
91 | static int link_config_ctx_connect(link_config_ctx *ctx) { |
92 | int r; | |
93 | ||
847a8a5f TG |
94 | if (ctx->ethtool_fd == -1) { |
95 | r = ethtool_connect(&ctx->ethtool_fd); | |
866ee368 TG |
96 | if (r < 0) { |
97 | log_warning("link_config: could not connect to ethtool: %s", | |
98 | strerror(-r)); | |
847a8a5f | 99 | return r; |
866ee368 | 100 | } |
847a8a5f | 101 | } |
97708579 | 102 | |
847a8a5f TG |
103 | if (!ctx->rtnl) { |
104 | r = sd_rtnl_open(&ctx->rtnl, 0); | |
866ee368 TG |
105 | if (r < 0) { |
106 | log_warning("link_config: could not connect to rtnl: %s", | |
107 | strerror(-r)); | |
847a8a5f | 108 | return r; |
866ee368 | 109 | } |
847a8a5f | 110 | } |
97708579 TG |
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); |
edf029b7 | 128 | free(link->name_policy); |
af6f0d42 TG |
129 | |
130 | free(link); | |
131 | } | |
132 | } | |
133 | ||
134 | void link_config_ctx_free(link_config_ctx *ctx) { | |
135 | if (!ctx) | |
136 | return; | |
137 | ||
03e334a1 | 138 | safe_close(ctx->ethtool_fd); |
43b3a5ef TG |
139 | |
140 | sd_rtnl_unref(ctx->rtnl); | |
141 | ||
af6f0d42 TG |
142 | link_configs_free(ctx); |
143 | ||
144 | free(ctx); | |
145 | ||
146 | return; | |
147 | } | |
148 | ||
149 | static int load_link(link_config_ctx *ctx, const char *filename) { | |
ecb08ec6 | 150 | _cleanup_free_ link_config *link = NULL; |
6e37cd2f | 151 | _cleanup_fclose_ FILE *file = NULL; |
af6f0d42 TG |
152 | int r; |
153 | ||
187dc6e5 TA |
154 | assert(ctx); |
155 | assert(filename); | |
156 | ||
af6f0d42 TG |
157 | file = fopen(filename, "re"); |
158 | if (!file) { | |
159 | if (errno == ENOENT) | |
160 | return 0; | |
161 | else | |
ecb08ec6 | 162 | return -errno; |
af6f0d42 TG |
163 | } |
164 | ||
ed88bcfb ZJS |
165 | if (null_or_empty_fd(fileno(file))) { |
166 | log_debug("Skipping empty file: %s", filename); | |
167 | return 0; | |
168 | } | |
169 | ||
af6f0d42 | 170 | link = new0(link_config, 1); |
ecb08ec6 ZJS |
171 | if (!link) |
172 | return log_oom(); | |
af6f0d42 | 173 | |
5fde13d7 TG |
174 | link->mac_policy = _MACPOLICY_INVALID; |
175 | link->wol = _WOL_INVALID; | |
176 | link->duplex = _DUP_INVALID; | |
177 | ||
e9f3d2d5 ZJS |
178 | r = config_parse(NULL, filename, file, |
179 | "Match\0Link\0Ethernet\0", | |
180 | config_item_perf_lookup, link_config_gperf_lookup, | |
36f822c4 ZJS |
181 | false, false, true, link); |
182 | if (r < 0) | |
ecb08ec6 | 183 | return r; |
36f822c4 | 184 | else |
98a375f6 | 185 | log_debug("Parsed configuration file %s", filename); |
af6f0d42 TG |
186 | |
187 | link->filename = strdup(filename); | |
188 | ||
189 | LIST_PREPEND(links, ctx->links, link); | |
ecb08ec6 | 190 | link = NULL; |
af6f0d42 TG |
191 | |
192 | return 0; | |
af6f0d42 TG |
193 | } |
194 | ||
f6194225 | 195 | static bool enable_name_policy(void) { |
f8a0bb52 | 196 | _cleanup_free_ char *line = NULL; |
a2a5291b | 197 | const char *word, *state; |
f6194225 TG |
198 | int r; |
199 | size_t l; | |
200 | ||
74df0fca LP |
201 | r = proc_cmdline(&line); |
202 | if (r < 0) | |
464cf22f TG |
203 | log_warning("Failed to read /proc/cmdline, ignoring: %s", |
204 | strerror(-r)); | |
74df0fca LP |
205 | if (r <= 0) |
206 | return true; | |
f6194225 | 207 | |
a2a5291b ZJS |
208 | FOREACH_WORD_QUOTED(word, l, line, state) |
209 | if (strneq(word, "net.ifnames=0", l)) | |
f6194225 TG |
210 | return false; |
211 | ||
212 | return true; | |
213 | } | |
214 | ||
af6f0d42 TG |
215 | int link_config_load(link_config_ctx *ctx) { |
216 | int r; | |
edf029b7 TG |
217 | _cleanup_strv_free_ char **files; |
218 | char **f; | |
af6f0d42 TG |
219 | |
220 | link_configs_free(ctx); | |
221 | ||
f6194225 TG |
222 | if (!enable_name_policy()) { |
223 | ctx->enable_name_policy = false; | |
224 | log_info("Network interface NamePolicy= disabled on kernel commandline, ignoring."); | |
225 | } | |
226 | ||
97f2d76d | 227 | /* update timestamp */ |
2ad8416d | 228 | paths_check_timestamp(link_dirs, &ctx->link_dirs_ts_usec, true); |
af6f0d42 | 229 | |
2ad8416d | 230 | r = conf_files_list_strv(&files, ".link", NULL, link_dirs); |
af6f0d42 TG |
231 | if (r < 0) { |
232 | log_error("failed to enumerate link files: %s", strerror(-r)); | |
233 | return r; | |
234 | } | |
235 | ||
236 | STRV_FOREACH_BACKWARDS(f, files) { | |
237 | r = load_link(ctx, *f); | |
238 | if (r < 0) | |
239 | return r; | |
240 | } | |
241 | ||
242 | return 0; | |
243 | } | |
244 | ||
245 | bool link_config_should_reload(link_config_ctx *ctx) { | |
2ad8416d | 246 | return paths_check_timestamp(link_dirs, &ctx->link_dirs_ts_usec, false); |
af6f0d42 TG |
247 | } |
248 | ||
464cf22f TG |
249 | int link_config_get(link_config_ctx *ctx, struct udev_device *device, |
250 | link_config **ret) { | |
af6f0d42 TG |
251 | link_config *link; |
252 | ||
253 | LIST_FOREACH(links, link, ctx->links) { | |
eb7040ec | 254 | const char* attr_value = udev_device_get_sysattr_value(device, "address"); |
b3e01314 | 255 | |
edbb03e9 TG |
256 | if (net_match_config(link->match_mac, link->match_path, link->match_driver, |
257 | link->match_type, NULL, link->match_host, | |
258 | link->match_virt, link->match_kernel, link->match_arch, | |
eb7040ec | 259 | attr_value ? ether_aton(attr_value) : NULL, |
b3e01314 | 260 | udev_device_get_property_value(device, "ID_PATH"), |
9b1c2626 | 261 | udev_device_get_driver(udev_device_get_parent(device)), |
bf175aaf | 262 | udev_device_get_property_value(device, "ID_NET_DRIVER"), |
b3e01314 TG |
263 | udev_device_get_devtype(device), |
264 | NULL)) { | |
be32eb9b TG |
265 | log_debug("Config file %s applies to device %s", |
266 | link->filename, | |
267 | udev_device_get_sysname(device)); | |
af6f0d42 TG |
268 | *ret = link; |
269 | return 0; | |
270 | } | |
271 | } | |
272 | ||
be32eb9b TG |
273 | *ret = NULL; |
274 | ||
af6f0d42 TG |
275 | return -ENOENT; |
276 | } | |
277 | ||
16b9b87a TG |
278 | static bool mac_is_random(struct udev_device *device) { |
279 | const char *s; | |
f1ac7002 TG |
280 | unsigned type; |
281 | int r; | |
16b9b87a | 282 | |
3c9b8860 | 283 | /* if we can't get the assign type, assume it is not random */ |
16b9b87a TG |
284 | s = udev_device_get_sysattr_value(device, "addr_assign_type"); |
285 | if (!s) | |
3c9b8860 TG |
286 | return false; |
287 | ||
f1ac7002 TG |
288 | r = safe_atou(s, &type); |
289 | if (r < 0) | |
290 | return false; | |
16b9b87a | 291 | |
04b67d49 TG |
292 | return type == NET_ADDR_RANDOM; |
293 | } | |
294 | ||
295 | static bool should_rename(struct udev_device *device, bool respect_predictable) { | |
296 | const char *s; | |
297 | unsigned type; | |
298 | int r; | |
299 | ||
3c9b8860 | 300 | /* if we can't get the assgin type, assume we should rename */ |
04b67d49 TG |
301 | s = udev_device_get_sysattr_value(device, "name_assign_type"); |
302 | if (!s) | |
3c9b8860 TG |
303 | return true; |
304 | ||
04b67d49 TG |
305 | r = safe_atou(s, &type); |
306 | if (r < 0) | |
307 | return true; | |
308 | ||
309 | switch (type) { | |
310 | case NET_NAME_USER: | |
311 | case NET_NAME_RENAMED: | |
3c9b8860 TG |
312 | /* these were already named by userspace, do not touch again */ |
313 | return false; | |
04b67d49 | 314 | case NET_NAME_PREDICTABLE: |
3c9b8860 | 315 | /* the kernel claims to have given a predictable name */ |
04b67d49 | 316 | if (respect_predictable) |
3c9b8860 | 317 | return false; |
04b67d49 TG |
318 | /* fall through */ |
319 | case NET_NAME_ENUM: | |
320 | default: | |
3c9b8860 TG |
321 | /* the name is known to be bad, or of an unknown type */ |
322 | return true; | |
04b67d49 | 323 | } |
16b9b87a TG |
324 | } |
325 | ||
464cf22f TG |
326 | static int get_mac(struct udev_device *device, bool want_random, |
327 | struct ether_addr *mac) { | |
9bf3b535 | 328 | int r; |
16b9b87a | 329 | |
16b9b87a | 330 | if (want_random) |
9bf3b535 | 331 | random_bytes(mac->ether_addr_octet, ETH_ALEN); |
16b9b87a | 332 | else { |
9bf3b535 | 333 | uint8_t result[8]; |
9bf3b535 | 334 | |
b5db00e5 | 335 | r = net_get_unique_predictable_data(device, result); |
16b9b87a | 336 | if (r < 0) |
55428d84 | 337 | return r; |
16b9b87a | 338 | |
9bf3b535 LP |
339 | assert_cc(ETH_ALEN <= sizeof(result)); |
340 | memcpy(mac->ether_addr_octet, result, ETH_ALEN); | |
16b9b87a TG |
341 | } |
342 | ||
343 | /* see eth_random_addr in the kernel */ | |
3c9b8860 TG |
344 | mac->ether_addr_octet[0] &= 0xfe; /* clear multicast bit */ |
345 | mac->ether_addr_octet[0] |= 0x02; /* set local assignment bit (IEEE802) */ | |
16b9b87a | 346 | |
16b9b87a TG |
347 | return 0; |
348 | } | |
349 | ||
464cf22f TG |
350 | int link_config_apply(link_config_ctx *ctx, link_config *config, |
351 | struct udev_device *device, const char **name) { | |
3e137a1b | 352 | const char *old_name; |
5fde13d7 TG |
353 | const char *new_name = NULL; |
354 | struct ether_addr generated_mac; | |
16b9b87a | 355 | struct ether_addr *mac = NULL; |
04b67d49 | 356 | bool respect_predictable = false; |
43b3a5ef | 357 | int r, ifindex; |
af6f0d42 | 358 | |
3e137a1b TG |
359 | assert(ctx); |
360 | assert(config); | |
361 | assert(device); | |
362 | assert(name); | |
363 | ||
97708579 TG |
364 | r = link_config_ctx_connect(ctx); |
365 | if (r < 0) | |
366 | return r; | |
367 | ||
3e137a1b TG |
368 | old_name = udev_device_get_sysname(device); |
369 | if (!old_name) | |
af6f0d42 TG |
370 | return -EINVAL; |
371 | ||
464cf22f TG |
372 | r = ethtool_set_speed(ctx->ethtool_fd, old_name, config->speed / 1024, |
373 | config->duplex); | |
5fde13d7 | 374 | if (r < 0) |
733f7a2c | 375 | log_warning("Could not set speed or duplex of %s to %u Mbps (%s): %s", |
464cf22f TG |
376 | old_name, config->speed / 1024, |
377 | duplex_to_string(config->duplex), strerror(-r)); | |
a5010333 | 378 | |
3e137a1b | 379 | r = ethtool_set_wol(ctx->ethtool_fd, old_name, config->wol); |
5fde13d7 TG |
380 | if (r < 0) |
381 | log_warning("Could not set WakeOnLan of %s to %s: %s", | |
3e137a1b | 382 | old_name, wol_to_string(config->wol), strerror(-r)); |
af6f0d42 | 383 | |
43b3a5ef TG |
384 | ifindex = udev_device_get_ifindex(device); |
385 | if (ifindex <= 0) { | |
386 | log_warning("Could not find ifindex"); | |
387 | return -ENODEV; | |
388 | } | |
389 | ||
f6194225 | 390 | if (ctx->enable_name_policy && config->name_policy) { |
5fde13d7 | 391 | NamePolicy *policy; |
daeb71a3 | 392 | |
68ba3877 TG |
393 | for (policy = config->name_policy; |
394 | !new_name && *policy != _NAMEPOLICY_INVALID; policy++) { | |
5fde13d7 | 395 | switch (*policy) { |
04b67d49 TG |
396 | case NAMEPOLICY_KERNEL: |
397 | respect_predictable = true; | |
398 | break; | |
e51660ae TG |
399 | case NAMEPOLICY_DATABASE: |
400 | new_name = udev_device_get_property_value(device, "ID_NET_NAME_FROM_DATABASE"); | |
401 | break; | |
5fde13d7 TG |
402 | case NAMEPOLICY_ONBOARD: |
403 | new_name = udev_device_get_property_value(device, "ID_NET_NAME_ONBOARD"); | |
daeb71a3 | 404 | break; |
5fde13d7 TG |
405 | case NAMEPOLICY_SLOT: |
406 | new_name = udev_device_get_property_value(device, "ID_NET_NAME_SLOT"); | |
daeb71a3 | 407 | break; |
5fde13d7 TG |
408 | case NAMEPOLICY_PATH: |
409 | new_name = udev_device_get_property_value(device, "ID_NET_NAME_PATH"); | |
daeb71a3 | 410 | break; |
5fde13d7 TG |
411 | case NAMEPOLICY_MAC: |
412 | new_name = udev_device_get_property_value(device, "ID_NET_NAME_MAC"); | |
daeb71a3 | 413 | break; |
5fde13d7 TG |
414 | default: |
415 | break; | |
416 | } | |
daeb71a3 TG |
417 | } |
418 | } | |
419 | ||
04b67d49 | 420 | if (should_rename(device, respect_predictable)) { |
3c9b8860 | 421 | /* if not set by policy, fall back manually set name */ |
04b67d49 | 422 | if (!new_name) |
04b67d49 TG |
423 | new_name = config->name; |
424 | } else | |
425 | new_name = NULL; | |
426 | ||
5fde13d7 TG |
427 | switch (config->mac_policy) { |
428 | case MACPOLICY_PERSISTENT: | |
92d927f8 | 429 | if (mac_is_random(device)) { |
5fde13d7 | 430 | r = get_mac(device, false, &generated_mac); |
a669ea98 TG |
431 | if (r == -ENOENT) |
432 | break; | |
433 | else if (r < 0) | |
16b9b87a | 434 | return r; |
5fde13d7 | 435 | mac = &generated_mac; |
16b9b87a | 436 | } |
5fde13d7 TG |
437 | break; |
438 | case MACPOLICY_RANDOM: | |
16b9b87a | 439 | if (!mac_is_random(device)) { |
5fde13d7 | 440 | r = get_mac(device, true, &generated_mac); |
a669ea98 TG |
441 | if (r == -ENOENT) |
442 | break; | |
443 | else if (r < 0) | |
16b9b87a | 444 | return r; |
5fde13d7 | 445 | mac = &generated_mac; |
16b9b87a | 446 | } |
5fde13d7 TG |
447 | break; |
448 | default: | |
449 | mac = config->mac; | |
16b9b87a TG |
450 | } |
451 | ||
464cf22f TG |
452 | r = rtnl_set_link_properties(ctx->rtnl, ifindex, config->alias, mac, |
453 | config->mtu); | |
43b3a5ef | 454 | if (r < 0) { |
464cf22f TG |
455 | log_warning("Could not set Alias, MACAddress or MTU on %s: %s", |
456 | old_name, strerror(-r)); | |
5fde13d7 | 457 | return r; |
43b3a5ef TG |
458 | } |
459 | ||
d95b83b8 TG |
460 | *name = new_name; |
461 | ||
af6f0d42 TG |
462 | return 0; |
463 | } | |
be32eb9b | 464 | |
847a8a5f TG |
465 | int link_get_driver(link_config_ctx *ctx, struct udev_device *device, char **ret) { |
466 | const char *name; | |
467 | char *driver; | |
468 | int r; | |
469 | ||
470 | r = link_config_ctx_connect(ctx); | |
471 | if (r < 0) | |
472 | return r; | |
473 | ||
474 | name = udev_device_get_sysname(device); | |
475 | if (!name) | |
476 | return -EINVAL; | |
477 | ||
478 | r = ethtool_get_driver(ctx->ethtool_fd, name, &driver); | |
479 | if (r < 0) | |
480 | return r; | |
481 | ||
482 | *ret = driver; | |
483 | return 0; | |
484 | } | |
485 | ||
2c5859af | 486 | static const char* const mac_policy_table[_MACPOLICY_MAX] = { |
be32eb9b TG |
487 | [MACPOLICY_PERSISTENT] = "persistent", |
488 | [MACPOLICY_RANDOM] = "random" | |
489 | }; | |
490 | ||
491 | DEFINE_STRING_TABLE_LOOKUP(mac_policy, MACPolicy); | |
464cf22f TG |
492 | DEFINE_CONFIG_PARSE_ENUM(config_parse_mac_policy, mac_policy, MACPolicy, |
493 | "Failed to parse MAC address policy"); | |
be32eb9b | 494 | |
2c5859af | 495 | static const char* const name_policy_table[_NAMEPOLICY_MAX] = { |
04b67d49 | 496 | [NAMEPOLICY_KERNEL] = "kernel", |
e51660ae | 497 | [NAMEPOLICY_DATABASE] = "database", |
be32eb9b TG |
498 | [NAMEPOLICY_ONBOARD] = "onboard", |
499 | [NAMEPOLICY_SLOT] = "slot", | |
500 | [NAMEPOLICY_PATH] = "path", | |
501 | [NAMEPOLICY_MAC] = "mac" | |
502 | }; | |
503 | ||
504 | DEFINE_STRING_TABLE_LOOKUP(name_policy, NamePolicy); | |
464cf22f TG |
505 | DEFINE_CONFIG_PARSE_ENUMV(config_parse_name_policy, name_policy, NamePolicy, |
506 | _NAMEPOLICY_INVALID, | |
507 | "Failed to parse interface name policy"); |