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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 TG |
22 | #include <netinet/ether.h> |
23 | ||
16b9b87a | 24 | #include "sd-id128.h" |
af6f0d42 | 25 | |
04b67d49 | 26 | #include "missing.h" |
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" |
c6f7c917 | 41 | #include "network-internal.h" |
9bf3b535 | 42 | #include "siphash24.h" |
af6f0d42 TG |
43 | |
44 | struct link_config_ctx { | |
45 | LIST_HEAD(link_config, links); | |
46 | ||
a5010333 TG |
47 | int ethtool_fd; |
48 | ||
f6194225 TG |
49 | bool enable_name_policy; |
50 | ||
43b3a5ef TG |
51 | sd_rtnl *rtnl; |
52 | ||
97f2d76d | 53 | usec_t link_dirs_ts_usec; |
af6f0d42 TG |
54 | }; |
55 | ||
2ad8416d ZJS |
56 | static const char* const link_dirs[] = { |
57 | "/etc/systemd/network", | |
58 | "/run/systemd/network", | |
59 | "/usr/lib/systemd/network", | |
60 | #ifdef HAVE_SPLIT_USR | |
61 | "/lib/systemd/network", | |
62 | #endif | |
63 | NULL}; | |
64 | ||
5b9d4dc0 TG |
65 | DEFINE_TRIVIAL_CLEANUP_FUNC(link_config_ctx*, link_config_ctx_free); |
66 | #define _cleanup_link_config_ctx_free_ _cleanup_(link_config_ctx_freep) | |
67 | ||
af6f0d42 | 68 | int link_config_ctx_new(link_config_ctx **ret) { |
5b9d4dc0 | 69 | _cleanup_link_config_ctx_free_ link_config_ctx *ctx = NULL; |
af6f0d42 TG |
70 | |
71 | if (!ret) | |
72 | return -EINVAL; | |
73 | ||
74 | ctx = new0(link_config_ctx, 1); | |
75 | if (!ctx) | |
76 | return -ENOMEM; | |
77 | ||
78 | LIST_HEAD_INIT(ctx->links); | |
79 | ||
97708579 TG |
80 | ctx->ethtool_fd = -1; |
81 | ||
f6194225 TG |
82 | ctx->enable_name_policy = true; |
83 | ||
af6f0d42 | 84 | *ret = ctx; |
5b9d4dc0 TG |
85 | ctx = NULL; |
86 | ||
af6f0d42 TG |
87 | return 0; |
88 | } | |
89 | ||
90 | static void link_configs_free(link_config_ctx *ctx) { | |
91 | link_config *link, *link_next; | |
92 | ||
93 | if (!ctx) | |
94 | return; | |
95 | ||
96 | LIST_FOREACH_SAFE(links, link, link_next, ctx->links) { | |
97 | free(link->filename); | |
98 | free(link->match_path); | |
99 | free(link->match_driver); | |
100 | free(link->match_type); | |
101 | free(link->description); | |
d2df0d0e | 102 | free(link->alias); |
edf029b7 | 103 | free(link->name_policy); |
af6f0d42 TG |
104 | |
105 | free(link); | |
106 | } | |
107 | } | |
108 | ||
109 | void link_config_ctx_free(link_config_ctx *ctx) { | |
110 | if (!ctx) | |
111 | return; | |
112 | ||
03e334a1 | 113 | safe_close(ctx->ethtool_fd); |
43b3a5ef TG |
114 | |
115 | sd_rtnl_unref(ctx->rtnl); | |
116 | ||
af6f0d42 TG |
117 | link_configs_free(ctx); |
118 | ||
119 | free(ctx); | |
120 | ||
121 | return; | |
122 | } | |
123 | ||
124 | static int load_link(link_config_ctx *ctx, const char *filename) { | |
ecb08ec6 | 125 | _cleanup_free_ link_config *link = NULL; |
6e37cd2f | 126 | _cleanup_fclose_ FILE *file = NULL; |
af6f0d42 TG |
127 | int r; |
128 | ||
187dc6e5 TA |
129 | assert(ctx); |
130 | assert(filename); | |
131 | ||
af6f0d42 TG |
132 | file = fopen(filename, "re"); |
133 | if (!file) { | |
134 | if (errno == ENOENT) | |
135 | return 0; | |
136 | else | |
ecb08ec6 | 137 | return -errno; |
af6f0d42 TG |
138 | } |
139 | ||
ed88bcfb ZJS |
140 | if (null_or_empty_fd(fileno(file))) { |
141 | log_debug("Skipping empty file: %s", filename); | |
142 | return 0; | |
143 | } | |
144 | ||
af6f0d42 | 145 | link = new0(link_config, 1); |
ecb08ec6 ZJS |
146 | if (!link) |
147 | return log_oom(); | |
af6f0d42 | 148 | |
5fde13d7 TG |
149 | link->mac_policy = _MACPOLICY_INVALID; |
150 | link->wol = _WOL_INVALID; | |
151 | link->duplex = _DUP_INVALID; | |
152 | ||
e9f3d2d5 ZJS |
153 | r = config_parse(NULL, filename, file, |
154 | "Match\0Link\0Ethernet\0", | |
155 | config_item_perf_lookup, link_config_gperf_lookup, | |
36f822c4 ZJS |
156 | false, false, true, link); |
157 | if (r < 0) | |
ecb08ec6 | 158 | return r; |
36f822c4 | 159 | else |
98a375f6 | 160 | log_debug("Parsed configuration file %s", filename); |
af6f0d42 TG |
161 | |
162 | link->filename = strdup(filename); | |
163 | ||
164 | LIST_PREPEND(links, ctx->links, link); | |
ecb08ec6 | 165 | link = NULL; |
af6f0d42 TG |
166 | |
167 | return 0; | |
af6f0d42 TG |
168 | } |
169 | ||
f6194225 | 170 | static bool enable_name_policy(void) { |
f8a0bb52 | 171 | _cleanup_free_ char *line = NULL; |
a2a5291b | 172 | const char *word, *state; |
f6194225 TG |
173 | int r; |
174 | size_t l; | |
175 | ||
74df0fca | 176 | r = proc_cmdline(&line); |
b5884878 | 177 | if (r < 0) { |
da927ba9 | 178 | log_warning_errno(r, "Failed to read /proc/cmdline, ignoring: %m"); |
74df0fca | 179 | return true; |
b5884878 | 180 | } |
f6194225 | 181 | |
a2a5291b ZJS |
182 | FOREACH_WORD_QUOTED(word, l, line, state) |
183 | if (strneq(word, "net.ifnames=0", l)) | |
f6194225 TG |
184 | return false; |
185 | ||
186 | return true; | |
187 | } | |
188 | ||
af6f0d42 TG |
189 | int link_config_load(link_config_ctx *ctx) { |
190 | int r; | |
edf029b7 TG |
191 | _cleanup_strv_free_ char **files; |
192 | char **f; | |
af6f0d42 TG |
193 | |
194 | link_configs_free(ctx); | |
195 | ||
f6194225 TG |
196 | if (!enable_name_policy()) { |
197 | ctx->enable_name_policy = false; | |
3f85ef0f | 198 | log_info("Network interface NamePolicy= disabled on kernel command line, ignoring."); |
f6194225 TG |
199 | } |
200 | ||
97f2d76d | 201 | /* update timestamp */ |
2ad8416d | 202 | paths_check_timestamp(link_dirs, &ctx->link_dirs_ts_usec, true); |
af6f0d42 | 203 | |
2ad8416d | 204 | r = conf_files_list_strv(&files, ".link", NULL, link_dirs); |
f647962d MS |
205 | if (r < 0) |
206 | return log_error_errno(r, "failed to enumerate link files: %m"); | |
af6f0d42 TG |
207 | |
208 | STRV_FOREACH_BACKWARDS(f, files) { | |
209 | r = load_link(ctx, *f); | |
210 | if (r < 0) | |
211 | return r; | |
212 | } | |
213 | ||
214 | return 0; | |
215 | } | |
216 | ||
217 | bool link_config_should_reload(link_config_ctx *ctx) { | |
2ad8416d | 218 | return paths_check_timestamp(link_dirs, &ctx->link_dirs_ts_usec, false); |
af6f0d42 TG |
219 | } |
220 | ||
464cf22f TG |
221 | int link_config_get(link_config_ctx *ctx, struct udev_device *device, |
222 | link_config **ret) { | |
af6f0d42 TG |
223 | link_config *link; |
224 | ||
225 | LIST_FOREACH(links, link, ctx->links) { | |
eb7040ec | 226 | const char* attr_value = udev_device_get_sysattr_value(device, "address"); |
b3e01314 | 227 | |
edbb03e9 TG |
228 | if (net_match_config(link->match_mac, link->match_path, link->match_driver, |
229 | link->match_type, NULL, link->match_host, | |
230 | link->match_virt, link->match_kernel, link->match_arch, | |
eb7040ec | 231 | attr_value ? ether_aton(attr_value) : NULL, |
b3e01314 | 232 | udev_device_get_property_value(device, "ID_PATH"), |
9b1c2626 | 233 | udev_device_get_driver(udev_device_get_parent(device)), |
bf175aaf | 234 | udev_device_get_property_value(device, "ID_NET_DRIVER"), |
b3e01314 TG |
235 | udev_device_get_devtype(device), |
236 | NULL)) { | |
be32eb9b TG |
237 | log_debug("Config file %s applies to device %s", |
238 | link->filename, | |
239 | udev_device_get_sysname(device)); | |
af6f0d42 TG |
240 | *ret = link; |
241 | return 0; | |
242 | } | |
243 | } | |
244 | ||
be32eb9b TG |
245 | *ret = NULL; |
246 | ||
af6f0d42 TG |
247 | return -ENOENT; |
248 | } | |
249 | ||
16b9b87a TG |
250 | static bool mac_is_random(struct udev_device *device) { |
251 | const char *s; | |
f1ac7002 TG |
252 | unsigned type; |
253 | int r; | |
16b9b87a | 254 | |
3c9b8860 | 255 | /* if we can't get the assign type, assume it is not random */ |
16b9b87a TG |
256 | s = udev_device_get_sysattr_value(device, "addr_assign_type"); |
257 | if (!s) | |
3c9b8860 TG |
258 | return false; |
259 | ||
f1ac7002 TG |
260 | r = safe_atou(s, &type); |
261 | if (r < 0) | |
262 | return false; | |
16b9b87a | 263 | |
04b67d49 TG |
264 | return type == NET_ADDR_RANDOM; |
265 | } | |
266 | ||
267 | static bool should_rename(struct udev_device *device, bool respect_predictable) { | |
268 | const char *s; | |
269 | unsigned type; | |
270 | int r; | |
271 | ||
3c9b8860 | 272 | /* if we can't get the assgin type, assume we should rename */ |
04b67d49 TG |
273 | s = udev_device_get_sysattr_value(device, "name_assign_type"); |
274 | if (!s) | |
3c9b8860 TG |
275 | return true; |
276 | ||
04b67d49 TG |
277 | r = safe_atou(s, &type); |
278 | if (r < 0) | |
279 | return true; | |
280 | ||
281 | switch (type) { | |
282 | case NET_NAME_USER: | |
283 | case NET_NAME_RENAMED: | |
3c9b8860 TG |
284 | /* these were already named by userspace, do not touch again */ |
285 | return false; | |
04b67d49 | 286 | case NET_NAME_PREDICTABLE: |
3c9b8860 | 287 | /* the kernel claims to have given a predictable name */ |
04b67d49 | 288 | if (respect_predictable) |
3c9b8860 | 289 | return false; |
04b67d49 TG |
290 | /* fall through */ |
291 | case NET_NAME_ENUM: | |
292 | default: | |
3c9b8860 TG |
293 | /* the name is known to be bad, or of an unknown type */ |
294 | return true; | |
04b67d49 | 295 | } |
16b9b87a TG |
296 | } |
297 | ||
464cf22f TG |
298 | static int get_mac(struct udev_device *device, bool want_random, |
299 | struct ether_addr *mac) { | |
9bf3b535 | 300 | int r; |
16b9b87a | 301 | |
16b9b87a | 302 | if (want_random) |
9bf3b535 | 303 | random_bytes(mac->ether_addr_octet, ETH_ALEN); |
16b9b87a | 304 | else { |
9bf3b535 | 305 | uint8_t result[8]; |
9bf3b535 | 306 | |
b5db00e5 | 307 | r = net_get_unique_predictable_data(device, result); |
16b9b87a | 308 | if (r < 0) |
55428d84 | 309 | return r; |
16b9b87a | 310 | |
9bf3b535 LP |
311 | assert_cc(ETH_ALEN <= sizeof(result)); |
312 | memcpy(mac->ether_addr_octet, result, ETH_ALEN); | |
16b9b87a TG |
313 | } |
314 | ||
315 | /* see eth_random_addr in the kernel */ | |
3c9b8860 TG |
316 | mac->ether_addr_octet[0] &= 0xfe; /* clear multicast bit */ |
317 | mac->ether_addr_octet[0] |= 0x02; /* set local assignment bit (IEEE802) */ | |
16b9b87a | 318 | |
16b9b87a TG |
319 | return 0; |
320 | } | |
321 | ||
464cf22f TG |
322 | int link_config_apply(link_config_ctx *ctx, link_config *config, |
323 | struct udev_device *device, const char **name) { | |
3e137a1b | 324 | const char *old_name; |
5fde13d7 TG |
325 | const char *new_name = NULL; |
326 | struct ether_addr generated_mac; | |
16b9b87a | 327 | struct ether_addr *mac = NULL; |
04b67d49 | 328 | bool respect_predictable = false; |
43b3a5ef | 329 | int r, ifindex; |
af6f0d42 | 330 | |
3e137a1b TG |
331 | assert(ctx); |
332 | assert(config); | |
333 | assert(device); | |
334 | assert(name); | |
335 | ||
3e137a1b TG |
336 | old_name = udev_device_get_sysname(device); |
337 | if (!old_name) | |
af6f0d42 TG |
338 | return -EINVAL; |
339 | ||
aedca892 | 340 | r = ethtool_set_speed(&ctx->ethtool_fd, old_name, config->speed / 1024, |
464cf22f | 341 | config->duplex); |
5fde13d7 | 342 | if (r < 0) |
755bde37 LP |
343 | log_warning_errno(r, "Could not set speed or duplex of %s to %u Mbps (%s): %m", |
344 | old_name, config->speed / 1024, | |
345 | duplex_to_string(config->duplex)); | |
a5010333 | 346 | |
aedca892 | 347 | r = ethtool_set_wol(&ctx->ethtool_fd, old_name, config->wol); |
5fde13d7 | 348 | if (r < 0) |
755bde37 LP |
349 | log_warning_errno(r, "Could not set WakeOnLan of %s to %s: %m", |
350 | old_name, wol_to_string(config->wol)); | |
af6f0d42 | 351 | |
43b3a5ef TG |
352 | ifindex = udev_device_get_ifindex(device); |
353 | if (ifindex <= 0) { | |
354 | log_warning("Could not find ifindex"); | |
355 | return -ENODEV; | |
356 | } | |
357 | ||
f6194225 | 358 | if (ctx->enable_name_policy && config->name_policy) { |
5fde13d7 | 359 | NamePolicy *policy; |
daeb71a3 | 360 | |
68ba3877 TG |
361 | for (policy = config->name_policy; |
362 | !new_name && *policy != _NAMEPOLICY_INVALID; policy++) { | |
5fde13d7 | 363 | switch (*policy) { |
04b67d49 TG |
364 | case NAMEPOLICY_KERNEL: |
365 | respect_predictable = true; | |
366 | break; | |
e51660ae TG |
367 | case NAMEPOLICY_DATABASE: |
368 | new_name = udev_device_get_property_value(device, "ID_NET_NAME_FROM_DATABASE"); | |
369 | break; | |
5fde13d7 TG |
370 | case NAMEPOLICY_ONBOARD: |
371 | new_name = udev_device_get_property_value(device, "ID_NET_NAME_ONBOARD"); | |
daeb71a3 | 372 | break; |
5fde13d7 TG |
373 | case NAMEPOLICY_SLOT: |
374 | new_name = udev_device_get_property_value(device, "ID_NET_NAME_SLOT"); | |
daeb71a3 | 375 | break; |
5fde13d7 TG |
376 | case NAMEPOLICY_PATH: |
377 | new_name = udev_device_get_property_value(device, "ID_NET_NAME_PATH"); | |
daeb71a3 | 378 | break; |
5fde13d7 TG |
379 | case NAMEPOLICY_MAC: |
380 | new_name = udev_device_get_property_value(device, "ID_NET_NAME_MAC"); | |
daeb71a3 | 381 | break; |
5fde13d7 TG |
382 | default: |
383 | break; | |
384 | } | |
daeb71a3 TG |
385 | } |
386 | } | |
387 | ||
04b67d49 | 388 | if (should_rename(device, respect_predictable)) { |
3c9b8860 | 389 | /* if not set by policy, fall back manually set name */ |
04b67d49 | 390 | if (!new_name) |
04b67d49 TG |
391 | new_name = config->name; |
392 | } else | |
393 | new_name = NULL; | |
394 | ||
5fde13d7 TG |
395 | switch (config->mac_policy) { |
396 | case MACPOLICY_PERSISTENT: | |
92d927f8 | 397 | if (mac_is_random(device)) { |
5fde13d7 | 398 | r = get_mac(device, false, &generated_mac); |
a669ea98 TG |
399 | if (r == -ENOENT) |
400 | break; | |
401 | else if (r < 0) | |
16b9b87a | 402 | return r; |
5fde13d7 | 403 | mac = &generated_mac; |
16b9b87a | 404 | } |
5fde13d7 TG |
405 | break; |
406 | case MACPOLICY_RANDOM: | |
16b9b87a | 407 | if (!mac_is_random(device)) { |
5fde13d7 | 408 | r = get_mac(device, true, &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 | default: | |
417 | mac = config->mac; | |
16b9b87a TG |
418 | } |
419 | ||
aedca892 | 420 | r = rtnl_set_link_properties(&ctx->rtnl, ifindex, config->alias, mac, |
464cf22f | 421 | config->mtu); |
f647962d MS |
422 | if (r < 0) |
423 | return log_warning_errno(r, "Could not set Alias, MACAddress or MTU on %s: %m", old_name); | |
43b3a5ef | 424 | |
d95b83b8 TG |
425 | *name = new_name; |
426 | ||
af6f0d42 TG |
427 | return 0; |
428 | } | |
be32eb9b | 429 | |
847a8a5f TG |
430 | int link_get_driver(link_config_ctx *ctx, struct udev_device *device, char **ret) { |
431 | const char *name; | |
432 | char *driver; | |
433 | int r; | |
434 | ||
847a8a5f TG |
435 | name = udev_device_get_sysname(device); |
436 | if (!name) | |
437 | return -EINVAL; | |
438 | ||
aedca892 | 439 | r = ethtool_get_driver(&ctx->ethtool_fd, name, &driver); |
847a8a5f TG |
440 | if (r < 0) |
441 | return r; | |
442 | ||
443 | *ret = driver; | |
444 | return 0; | |
445 | } | |
446 | ||
2c5859af | 447 | static const char* const mac_policy_table[_MACPOLICY_MAX] = { |
be32eb9b TG |
448 | [MACPOLICY_PERSISTENT] = "persistent", |
449 | [MACPOLICY_RANDOM] = "random" | |
450 | }; | |
451 | ||
452 | DEFINE_STRING_TABLE_LOOKUP(mac_policy, MACPolicy); | |
464cf22f TG |
453 | DEFINE_CONFIG_PARSE_ENUM(config_parse_mac_policy, mac_policy, MACPolicy, |
454 | "Failed to parse MAC address policy"); | |
be32eb9b | 455 | |
2c5859af | 456 | static const char* const name_policy_table[_NAMEPOLICY_MAX] = { |
04b67d49 | 457 | [NAMEPOLICY_KERNEL] = "kernel", |
e51660ae | 458 | [NAMEPOLICY_DATABASE] = "database", |
be32eb9b TG |
459 | [NAMEPOLICY_ONBOARD] = "onboard", |
460 | [NAMEPOLICY_SLOT] = "slot", | |
461 | [NAMEPOLICY_PATH] = "path", | |
462 | [NAMEPOLICY_MAC] = "mac" | |
463 | }; | |
464 | ||
465 | DEFINE_STRING_TABLE_LOOKUP(name_policy, NamePolicy); | |
464cf22f TG |
466 | DEFINE_CONFIG_PARSE_ENUMV(config_parse_name_policy, name_policy, NamePolicy, |
467 | _NAMEPOLICY_INVALID, | |
468 | "Failed to parse interface name policy"); |