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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> |
7eb08da4 | 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 | ||
91 | static void link_configs_free(link_config_ctx *ctx) { | |
92 | link_config *link, *link_next; | |
93 | ||
94 | if (!ctx) | |
95 | return; | |
96 | ||
97 | LIST_FOREACH_SAFE(links, link, link_next, ctx->links) { | |
98 | free(link->filename); | |
7eb08da4 | 99 | free(link->name); |
af6f0d42 TG |
100 | free(link->match_path); |
101 | free(link->match_driver); | |
102 | free(link->match_type); | |
103 | free(link->description); | |
d2df0d0e | 104 | free(link->alias); |
edf029b7 | 105 | free(link->name_policy); |
af6f0d42 TG |
106 | |
107 | free(link); | |
108 | } | |
109 | } | |
110 | ||
111 | void link_config_ctx_free(link_config_ctx *ctx) { | |
112 | if (!ctx) | |
113 | return; | |
114 | ||
03e334a1 | 115 | safe_close(ctx->ethtool_fd); |
43b3a5ef TG |
116 | |
117 | sd_rtnl_unref(ctx->rtnl); | |
118 | ||
af6f0d42 TG |
119 | link_configs_free(ctx); |
120 | ||
121 | free(ctx); | |
122 | ||
123 | return; | |
124 | } | |
125 | ||
126 | static int load_link(link_config_ctx *ctx, const char *filename) { | |
ecb08ec6 | 127 | _cleanup_free_ link_config *link = NULL; |
6e37cd2f | 128 | _cleanup_fclose_ FILE *file = NULL; |
af6f0d42 TG |
129 | int r; |
130 | ||
187dc6e5 TA |
131 | assert(ctx); |
132 | assert(filename); | |
133 | ||
af6f0d42 TG |
134 | file = fopen(filename, "re"); |
135 | if (!file) { | |
136 | if (errno == ENOENT) | |
137 | return 0; | |
138 | else | |
ecb08ec6 | 139 | return -errno; |
af6f0d42 TG |
140 | } |
141 | ||
ed88bcfb ZJS |
142 | if (null_or_empty_fd(fileno(file))) { |
143 | log_debug("Skipping empty file: %s", filename); | |
144 | return 0; | |
145 | } | |
146 | ||
af6f0d42 | 147 | link = new0(link_config, 1); |
ecb08ec6 ZJS |
148 | if (!link) |
149 | return log_oom(); | |
af6f0d42 | 150 | |
5fde13d7 TG |
151 | link->mac_policy = _MACPOLICY_INVALID; |
152 | link->wol = _WOL_INVALID; | |
153 | link->duplex = _DUP_INVALID; | |
154 | ||
e9f3d2d5 ZJS |
155 | r = config_parse(NULL, filename, file, |
156 | "Match\0Link\0Ethernet\0", | |
157 | config_item_perf_lookup, link_config_gperf_lookup, | |
36f822c4 ZJS |
158 | false, false, true, link); |
159 | if (r < 0) | |
ecb08ec6 | 160 | return r; |
36f822c4 | 161 | else |
98a375f6 | 162 | log_debug("Parsed configuration file %s", filename); |
af6f0d42 TG |
163 | |
164 | link->filename = strdup(filename); | |
165 | ||
166 | LIST_PREPEND(links, ctx->links, link); | |
ecb08ec6 | 167 | link = NULL; |
af6f0d42 TG |
168 | |
169 | return 0; | |
af6f0d42 TG |
170 | } |
171 | ||
f6194225 | 172 | static bool enable_name_policy(void) { |
f8a0bb52 | 173 | _cleanup_free_ char *line = NULL; |
a2a5291b | 174 | const char *word, *state; |
f6194225 TG |
175 | int r; |
176 | size_t l; | |
177 | ||
74df0fca | 178 | r = proc_cmdline(&line); |
b5884878 | 179 | if (r < 0) { |
da927ba9 | 180 | log_warning_errno(r, "Failed to read /proc/cmdline, ignoring: %m"); |
74df0fca | 181 | return true; |
b5884878 | 182 | } |
f6194225 | 183 | |
a2a5291b ZJS |
184 | FOREACH_WORD_QUOTED(word, l, line, state) |
185 | if (strneq(word, "net.ifnames=0", l)) | |
f6194225 TG |
186 | return false; |
187 | ||
188 | return true; | |
189 | } | |
190 | ||
af6f0d42 TG |
191 | int link_config_load(link_config_ctx *ctx) { |
192 | int r; | |
edf029b7 TG |
193 | _cleanup_strv_free_ char **files; |
194 | char **f; | |
af6f0d42 TG |
195 | |
196 | link_configs_free(ctx); | |
197 | ||
f6194225 TG |
198 | if (!enable_name_policy()) { |
199 | ctx->enable_name_policy = false; | |
3f85ef0f | 200 | log_info("Network interface NamePolicy= disabled on kernel command line, ignoring."); |
f6194225 TG |
201 | } |
202 | ||
97f2d76d | 203 | /* update timestamp */ |
2ad8416d | 204 | paths_check_timestamp(link_dirs, &ctx->link_dirs_ts_usec, true); |
af6f0d42 | 205 | |
2ad8416d | 206 | r = conf_files_list_strv(&files, ".link", NULL, link_dirs); |
f647962d MS |
207 | if (r < 0) |
208 | return log_error_errno(r, "failed to enumerate link files: %m"); | |
af6f0d42 TG |
209 | |
210 | STRV_FOREACH_BACKWARDS(f, files) { | |
211 | r = load_link(ctx, *f); | |
212 | if (r < 0) | |
213 | return r; | |
214 | } | |
215 | ||
216 | return 0; | |
217 | } | |
218 | ||
219 | bool link_config_should_reload(link_config_ctx *ctx) { | |
2ad8416d | 220 | return paths_check_timestamp(link_dirs, &ctx->link_dirs_ts_usec, false); |
af6f0d42 TG |
221 | } |
222 | ||
464cf22f TG |
223 | int link_config_get(link_config_ctx *ctx, struct udev_device *device, |
224 | link_config **ret) { | |
af6f0d42 TG |
225 | link_config *link; |
226 | ||
227 | LIST_FOREACH(links, link, ctx->links) { | |
7eb08da4 TG |
228 | const char* attr_value; |
229 | unsigned char name_assign_type = NET_NAME_UNKNOWN; | |
230 | ||
231 | attr_value = udev_device_get_sysattr_value(device, "name_assign_type"); | |
232 | if (attr_value) | |
233 | (void)safe_atou8(attr_value, &name_assign_type); | |
234 | ||
235 | attr_value = udev_device_get_sysattr_value(device, "address"); | |
b3e01314 | 236 | |
edbb03e9 | 237 | if (net_match_config(link->match_mac, link->match_path, link->match_driver, |
7eb08da4 | 238 | link->match_type, link->match_name, link->match_host, |
edbb03e9 | 239 | link->match_virt, link->match_kernel, link->match_arch, |
eb7040ec | 240 | attr_value ? ether_aton(attr_value) : NULL, |
b3e01314 | 241 | udev_device_get_property_value(device, "ID_PATH"), |
9b1c2626 | 242 | udev_device_get_driver(udev_device_get_parent(device)), |
bf175aaf | 243 | udev_device_get_property_value(device, "ID_NET_DRIVER"), |
b3e01314 | 244 | udev_device_get_devtype(device), |
7eb08da4 TG |
245 | udev_device_get_sysname(device), |
246 | name_assign_type == NET_NAME_RENAMED)) { | |
be32eb9b TG |
247 | log_debug("Config file %s applies to device %s", |
248 | link->filename, | |
249 | udev_device_get_sysname(device)); | |
af6f0d42 TG |
250 | *ret = link; |
251 | return 0; | |
252 | } | |
253 | } | |
254 | ||
be32eb9b TG |
255 | *ret = NULL; |
256 | ||
af6f0d42 TG |
257 | return -ENOENT; |
258 | } | |
259 | ||
16b9b87a TG |
260 | static bool mac_is_random(struct udev_device *device) { |
261 | const char *s; | |
f1ac7002 TG |
262 | unsigned type; |
263 | int r; | |
16b9b87a | 264 | |
3c9b8860 | 265 | /* if we can't get the assign type, assume it is not random */ |
16b9b87a TG |
266 | s = udev_device_get_sysattr_value(device, "addr_assign_type"); |
267 | if (!s) | |
3c9b8860 TG |
268 | return false; |
269 | ||
f1ac7002 TG |
270 | r = safe_atou(s, &type); |
271 | if (r < 0) | |
272 | return false; | |
16b9b87a | 273 | |
04b67d49 TG |
274 | return type == NET_ADDR_RANDOM; |
275 | } | |
276 | ||
277 | static bool should_rename(struct udev_device *device, bool respect_predictable) { | |
278 | const char *s; | |
279 | unsigned type; | |
280 | int r; | |
281 | ||
3c9b8860 | 282 | /* if we can't get the assgin type, assume we should rename */ |
04b67d49 TG |
283 | s = udev_device_get_sysattr_value(device, "name_assign_type"); |
284 | if (!s) | |
3c9b8860 TG |
285 | return true; |
286 | ||
04b67d49 TG |
287 | r = safe_atou(s, &type); |
288 | if (r < 0) | |
289 | return true; | |
290 | ||
291 | switch (type) { | |
292 | case NET_NAME_USER: | |
293 | case NET_NAME_RENAMED: | |
3c9b8860 TG |
294 | /* these were already named by userspace, do not touch again */ |
295 | return false; | |
04b67d49 | 296 | case NET_NAME_PREDICTABLE: |
3c9b8860 | 297 | /* the kernel claims to have given a predictable name */ |
04b67d49 | 298 | if (respect_predictable) |
3c9b8860 | 299 | return false; |
04b67d49 TG |
300 | /* fall through */ |
301 | case NET_NAME_ENUM: | |
302 | default: | |
3c9b8860 TG |
303 | /* the name is known to be bad, or of an unknown type */ |
304 | return true; | |
04b67d49 | 305 | } |
16b9b87a TG |
306 | } |
307 | ||
464cf22f TG |
308 | static int get_mac(struct udev_device *device, bool want_random, |
309 | struct ether_addr *mac) { | |
9bf3b535 | 310 | int r; |
16b9b87a | 311 | |
16b9b87a | 312 | if (want_random) |
9bf3b535 | 313 | random_bytes(mac->ether_addr_octet, ETH_ALEN); |
16b9b87a | 314 | else { |
9bf3b535 | 315 | uint8_t result[8]; |
9bf3b535 | 316 | |
b5db00e5 | 317 | r = net_get_unique_predictable_data(device, result); |
16b9b87a | 318 | if (r < 0) |
55428d84 | 319 | return r; |
16b9b87a | 320 | |
9bf3b535 LP |
321 | assert_cc(ETH_ALEN <= sizeof(result)); |
322 | memcpy(mac->ether_addr_octet, result, ETH_ALEN); | |
16b9b87a TG |
323 | } |
324 | ||
325 | /* see eth_random_addr in the kernel */ | |
3c9b8860 TG |
326 | mac->ether_addr_octet[0] &= 0xfe; /* clear multicast bit */ |
327 | mac->ether_addr_octet[0] |= 0x02; /* set local assignment bit (IEEE802) */ | |
16b9b87a | 328 | |
16b9b87a TG |
329 | return 0; |
330 | } | |
331 | ||
464cf22f TG |
332 | int link_config_apply(link_config_ctx *ctx, link_config *config, |
333 | struct udev_device *device, const char **name) { | |
3e137a1b | 334 | const char *old_name; |
5fde13d7 TG |
335 | const char *new_name = NULL; |
336 | struct ether_addr generated_mac; | |
16b9b87a | 337 | struct ether_addr *mac = NULL; |
04b67d49 | 338 | bool respect_predictable = false; |
43b3a5ef | 339 | int r, ifindex; |
af6f0d42 | 340 | |
3e137a1b TG |
341 | assert(ctx); |
342 | assert(config); | |
343 | assert(device); | |
344 | assert(name); | |
345 | ||
3e137a1b TG |
346 | old_name = udev_device_get_sysname(device); |
347 | if (!old_name) | |
af6f0d42 TG |
348 | return -EINVAL; |
349 | ||
aedca892 | 350 | r = ethtool_set_speed(&ctx->ethtool_fd, old_name, config->speed / 1024, |
464cf22f | 351 | config->duplex); |
5fde13d7 | 352 | if (r < 0) |
755bde37 LP |
353 | log_warning_errno(r, "Could not set speed or duplex of %s to %u Mbps (%s): %m", |
354 | old_name, config->speed / 1024, | |
355 | duplex_to_string(config->duplex)); | |
a5010333 | 356 | |
aedca892 | 357 | r = ethtool_set_wol(&ctx->ethtool_fd, old_name, config->wol); |
5fde13d7 | 358 | if (r < 0) |
755bde37 LP |
359 | log_warning_errno(r, "Could not set WakeOnLan of %s to %s: %m", |
360 | old_name, wol_to_string(config->wol)); | |
af6f0d42 | 361 | |
43b3a5ef TG |
362 | ifindex = udev_device_get_ifindex(device); |
363 | if (ifindex <= 0) { | |
364 | log_warning("Could not find ifindex"); | |
365 | return -ENODEV; | |
366 | } | |
367 | ||
f6194225 | 368 | if (ctx->enable_name_policy && config->name_policy) { |
5fde13d7 | 369 | NamePolicy *policy; |
daeb71a3 | 370 | |
68ba3877 TG |
371 | for (policy = config->name_policy; |
372 | !new_name && *policy != _NAMEPOLICY_INVALID; policy++) { | |
5fde13d7 | 373 | switch (*policy) { |
04b67d49 TG |
374 | case NAMEPOLICY_KERNEL: |
375 | respect_predictable = true; | |
376 | break; | |
e51660ae TG |
377 | case NAMEPOLICY_DATABASE: |
378 | new_name = udev_device_get_property_value(device, "ID_NET_NAME_FROM_DATABASE"); | |
379 | break; | |
5fde13d7 TG |
380 | case NAMEPOLICY_ONBOARD: |
381 | new_name = udev_device_get_property_value(device, "ID_NET_NAME_ONBOARD"); | |
daeb71a3 | 382 | break; |
5fde13d7 TG |
383 | case NAMEPOLICY_SLOT: |
384 | new_name = udev_device_get_property_value(device, "ID_NET_NAME_SLOT"); | |
daeb71a3 | 385 | break; |
5fde13d7 TG |
386 | case NAMEPOLICY_PATH: |
387 | new_name = udev_device_get_property_value(device, "ID_NET_NAME_PATH"); | |
daeb71a3 | 388 | break; |
5fde13d7 TG |
389 | case NAMEPOLICY_MAC: |
390 | new_name = udev_device_get_property_value(device, "ID_NET_NAME_MAC"); | |
daeb71a3 | 391 | break; |
5fde13d7 TG |
392 | default: |
393 | break; | |
394 | } | |
daeb71a3 TG |
395 | } |
396 | } | |
397 | ||
04b67d49 | 398 | if (should_rename(device, respect_predictable)) { |
3c9b8860 | 399 | /* if not set by policy, fall back manually set name */ |
04b67d49 | 400 | if (!new_name) |
04b67d49 TG |
401 | new_name = config->name; |
402 | } else | |
403 | new_name = NULL; | |
404 | ||
5fde13d7 TG |
405 | switch (config->mac_policy) { |
406 | case MACPOLICY_PERSISTENT: | |
92d927f8 | 407 | if (mac_is_random(device)) { |
5fde13d7 | 408 | r = get_mac(device, false, &generated_mac); |
a669ea98 TG |
409 | if (r == -ENOENT) |
410 | break; | |
411 | else if (r < 0) | |
16b9b87a | 412 | return r; |
5fde13d7 | 413 | mac = &generated_mac; |
16b9b87a | 414 | } |
5fde13d7 TG |
415 | break; |
416 | case MACPOLICY_RANDOM: | |
16b9b87a | 417 | if (!mac_is_random(device)) { |
5fde13d7 | 418 | r = get_mac(device, true, &generated_mac); |
a669ea98 TG |
419 | if (r == -ENOENT) |
420 | break; | |
421 | else if (r < 0) | |
16b9b87a | 422 | return r; |
5fde13d7 | 423 | mac = &generated_mac; |
16b9b87a | 424 | } |
5fde13d7 TG |
425 | break; |
426 | default: | |
427 | mac = config->mac; | |
16b9b87a TG |
428 | } |
429 | ||
aedca892 | 430 | r = rtnl_set_link_properties(&ctx->rtnl, ifindex, config->alias, mac, |
464cf22f | 431 | config->mtu); |
f647962d MS |
432 | if (r < 0) |
433 | return log_warning_errno(r, "Could not set Alias, MACAddress or MTU on %s: %m", old_name); | |
43b3a5ef | 434 | |
d95b83b8 TG |
435 | *name = new_name; |
436 | ||
af6f0d42 TG |
437 | return 0; |
438 | } | |
be32eb9b | 439 | |
847a8a5f TG |
440 | int link_get_driver(link_config_ctx *ctx, struct udev_device *device, char **ret) { |
441 | const char *name; | |
442 | char *driver; | |
443 | int r; | |
444 | ||
847a8a5f TG |
445 | name = udev_device_get_sysname(device); |
446 | if (!name) | |
447 | return -EINVAL; | |
448 | ||
aedca892 | 449 | r = ethtool_get_driver(&ctx->ethtool_fd, name, &driver); |
847a8a5f TG |
450 | if (r < 0) |
451 | return r; | |
452 | ||
453 | *ret = driver; | |
454 | return 0; | |
455 | } | |
456 | ||
2c5859af | 457 | static const char* const mac_policy_table[_MACPOLICY_MAX] = { |
be32eb9b TG |
458 | [MACPOLICY_PERSISTENT] = "persistent", |
459 | [MACPOLICY_RANDOM] = "random" | |
460 | }; | |
461 | ||
462 | DEFINE_STRING_TABLE_LOOKUP(mac_policy, MACPolicy); | |
464cf22f TG |
463 | DEFINE_CONFIG_PARSE_ENUM(config_parse_mac_policy, mac_policy, MACPolicy, |
464 | "Failed to parse MAC address policy"); | |
be32eb9b | 465 | |
2c5859af | 466 | static const char* const name_policy_table[_NAMEPOLICY_MAX] = { |
04b67d49 | 467 | [NAMEPOLICY_KERNEL] = "kernel", |
e51660ae | 468 | [NAMEPOLICY_DATABASE] = "database", |
be32eb9b TG |
469 | [NAMEPOLICY_ONBOARD] = "onboard", |
470 | [NAMEPOLICY_SLOT] = "slot", | |
471 | [NAMEPOLICY_PATH] = "path", | |
472 | [NAMEPOLICY_MAC] = "mac" | |
473 | }; | |
474 | ||
475 | DEFINE_STRING_TABLE_LOOKUP(name_policy, NamePolicy); | |
464cf22f TG |
476 | DEFINE_CONFIG_PARSE_ENUMV(config_parse_name_policy, name_policy, NamePolicy, |
477 | _NAMEPOLICY_INVALID, | |
478 | "Failed to parse interface name policy"); |