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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" |
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 | ||
af6f0d42 | 53 | char **link_dirs; |
97f2d76d | 54 | usec_t link_dirs_ts_usec; |
af6f0d42 TG |
55 | }; |
56 | ||
5b9d4dc0 TG |
57 | DEFINE_TRIVIAL_CLEANUP_FUNC(link_config_ctx*, link_config_ctx_free); |
58 | #define _cleanup_link_config_ctx_free_ _cleanup_(link_config_ctx_freep) | |
59 | ||
af6f0d42 | 60 | int link_config_ctx_new(link_config_ctx **ret) { |
5b9d4dc0 | 61 | _cleanup_link_config_ctx_free_ link_config_ctx *ctx = NULL; |
af6f0d42 TG |
62 | |
63 | if (!ret) | |
64 | return -EINVAL; | |
65 | ||
66 | ctx = new0(link_config_ctx, 1); | |
67 | if (!ctx) | |
68 | return -ENOMEM; | |
69 | ||
70 | LIST_HEAD_INIT(ctx->links); | |
71 | ||
97708579 TG |
72 | ctx->ethtool_fd = -1; |
73 | ||
f6194225 TG |
74 | ctx->enable_name_policy = true; |
75 | ||
9dc670ea TG |
76 | ctx->link_dirs = strv_new("/etc/systemd/network", |
77 | "/run/systemd/network", | |
78 | "/usr/lib/systemd/network", | |
c50e28a3 DR |
79 | #ifdef HAVE_SPLIT_USR |
80 | "/lib/systemd/network", | |
81 | #endif | |
af6f0d42 TG |
82 | NULL); |
83 | if (!ctx->link_dirs) { | |
84 | log_error("failed to build link config directory array"); | |
af6f0d42 TG |
85 | return -ENOMEM; |
86 | } | |
5b9d4dc0 | 87 | |
af6f0d42 | 88 | if (!path_strv_canonicalize_uniq(ctx->link_dirs)) { |
9f6445e3 | 89 | log_error("failed to canonicalize link config directories"); |
af6f0d42 TG |
90 | return -ENOMEM; |
91 | } | |
92 | ||
af6f0d42 | 93 | *ret = ctx; |
5b9d4dc0 TG |
94 | ctx = NULL; |
95 | ||
af6f0d42 TG |
96 | return 0; |
97 | } | |
98 | ||
97708579 TG |
99 | static int link_config_ctx_connect(link_config_ctx *ctx) { |
100 | int r; | |
101 | ||
102 | if (ctx->ethtool_fd >= 0 && ctx->rtnl) | |
103 | return 0; | |
104 | ||
105 | r = ethtool_connect(&ctx->ethtool_fd); | |
106 | if (r < 0) | |
107 | return r; | |
108 | ||
109 | r = sd_rtnl_open(0, &ctx->rtnl); | |
110 | if (r < 0) | |
111 | return r; | |
112 | ||
113 | return 0; | |
114 | } | |
115 | ||
af6f0d42 TG |
116 | static void link_configs_free(link_config_ctx *ctx) { |
117 | link_config *link, *link_next; | |
118 | ||
119 | if (!ctx) | |
120 | return; | |
121 | ||
122 | LIST_FOREACH_SAFE(links, link, link_next, ctx->links) { | |
123 | free(link->filename); | |
124 | free(link->match_path); | |
125 | free(link->match_driver); | |
126 | free(link->match_type); | |
127 | free(link->description); | |
d2df0d0e | 128 | free(link->alias); |
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 | ||
43b3a5ef TG |
138 | if (ctx->ethtool_fd >= 0) |
139 | close_nointr_nofail(ctx->ethtool_fd); | |
140 | ||
141 | sd_rtnl_unref(ctx->rtnl); | |
142 | ||
af6f0d42 | 143 | strv_free(ctx->link_dirs); |
af6f0d42 TG |
144 | link_configs_free(ctx); |
145 | ||
146 | free(ctx); | |
147 | ||
148 | return; | |
149 | } | |
150 | ||
151 | static int load_link(link_config_ctx *ctx, const char *filename) { | |
152 | link_config *link; | |
2fd069b1 | 153 | _cleanup_fclose_ FILE *file; |
af6f0d42 TG |
154 | int r; |
155 | ||
187dc6e5 TA |
156 | assert(ctx); |
157 | assert(filename); | |
158 | ||
af6f0d42 TG |
159 | file = fopen(filename, "re"); |
160 | if (!file) { | |
161 | if (errno == ENOENT) | |
162 | return 0; | |
163 | else | |
164 | return errno; | |
165 | } | |
166 | ||
167 | link = new0(link_config, 1); | |
168 | if (!link) { | |
169 | r = log_oom(); | |
170 | goto failure; | |
171 | } | |
172 | ||
5fde13d7 TG |
173 | link->mac_policy = _MACPOLICY_INVALID; |
174 | link->wol = _WOL_INVALID; | |
175 | link->duplex = _DUP_INVALID; | |
176 | ||
af6f0d42 TG |
177 | r = config_parse(NULL, filename, file, "Match\0Link\0Ethernet\0", config_item_perf_lookup, |
178 | (void*) link_config_gperf_lookup, false, false, link); | |
179 | if (r < 0) { | |
48912436 | 180 | log_warning("Could not parse config file %s: %s", filename, strerror(-r)); |
af6f0d42 TG |
181 | goto failure; |
182 | } else | |
98a375f6 | 183 | log_debug("Parsed configuration file %s", filename); |
af6f0d42 TG |
184 | |
185 | link->filename = strdup(filename); | |
186 | ||
187 | LIST_PREPEND(links, ctx->links, link); | |
188 | ||
189 | return 0; | |
190 | ||
191 | failure: | |
192 | free(link); | |
193 | return r; | |
194 | } | |
195 | ||
f6194225 TG |
196 | static bool enable_name_policy(void) { |
197 | _cleanup_free_ char *line; | |
198 | char *w, *state; | |
199 | int r; | |
200 | size_t l; | |
201 | ||
74df0fca LP |
202 | r = proc_cmdline(&line); |
203 | if (r < 0) | |
f6194225 | 204 | log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r)); |
74df0fca LP |
205 | if (r <= 0) |
206 | return true; | |
f6194225 TG |
207 | |
208 | FOREACH_WORD_QUOTED(w, l, line, state) | |
ff83aac3 | 209 | if (strneq(w, "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; | |
217 | char **files, **f; | |
218 | ||
219 | link_configs_free(ctx); | |
220 | ||
f6194225 TG |
221 | if (!enable_name_policy()) { |
222 | ctx->enable_name_policy = false; | |
223 | log_info("Network interface NamePolicy= disabled on kernel commandline, ignoring."); | |
224 | } | |
225 | ||
97f2d76d TG |
226 | /* update timestamp */ |
227 | paths_check_timestamp(ctx->link_dirs, &ctx->link_dirs_ts_usec, true); | |
af6f0d42 TG |
228 | |
229 | r = conf_files_list_strv(&files, ".link", NULL, (const char **)ctx->link_dirs); | |
230 | if (r < 0) { | |
231 | log_error("failed to enumerate link files: %s", strerror(-r)); | |
232 | return r; | |
233 | } | |
234 | ||
235 | STRV_FOREACH_BACKWARDS(f, files) { | |
236 | r = load_link(ctx, *f); | |
237 | if (r < 0) | |
238 | return r; | |
239 | } | |
240 | ||
241 | return 0; | |
242 | } | |
243 | ||
244 | bool link_config_should_reload(link_config_ctx *ctx) { | |
97f2d76d | 245 | return paths_check_timestamp(ctx->link_dirs, &ctx->link_dirs_ts_usec, false); |
af6f0d42 TG |
246 | } |
247 | ||
af6f0d42 TG |
248 | int link_config_get(link_config_ctx *ctx, struct udev_device *device, link_config **ret) { |
249 | link_config *link; | |
250 | ||
251 | LIST_FOREACH(links, link, ctx->links) { | |
b3e01314 | 252 | |
be32eb9b | 253 | if (net_match_config(link->match_mac, link->match_path, |
b3e01314 TG |
254 | link->match_driver, link->match_type, NULL, |
255 | udev_device_get_sysattr_value(device, "address"), | |
256 | udev_device_get_property_value(device, "ID_PATH"), | |
257 | udev_device_get_driver(device), | |
258 | udev_device_get_devtype(device), | |
259 | NULL)) { | |
be32eb9b TG |
260 | log_debug("Config file %s applies to device %s", |
261 | link->filename, | |
262 | udev_device_get_sysname(device)); | |
af6f0d42 TG |
263 | *ret = link; |
264 | return 0; | |
265 | } | |
266 | } | |
267 | ||
be32eb9b TG |
268 | *ret = NULL; |
269 | ||
af6f0d42 TG |
270 | return -ENOENT; |
271 | } | |
272 | ||
16b9b87a TG |
273 | static bool mac_is_random(struct udev_device *device) { |
274 | const char *s; | |
f1ac7002 TG |
275 | unsigned type; |
276 | int r; | |
16b9b87a TG |
277 | |
278 | s = udev_device_get_sysattr_value(device, "addr_assign_type"); | |
279 | if (!s) | |
f1ac7002 TG |
280 | return false; /* if we don't know, assume it is not random */ |
281 | r = safe_atou(s, &type); | |
282 | if (r < 0) | |
283 | return false; | |
16b9b87a TG |
284 | |
285 | /* check for NET_ADDR_RANDOM */ | |
286 | return type == 1; | |
287 | } | |
288 | ||
289 | static bool mac_is_permanent(struct udev_device *device) { | |
290 | const char *s; | |
f1ac7002 TG |
291 | unsigned type; |
292 | int r; | |
16b9b87a TG |
293 | |
294 | s = udev_device_get_sysattr_value(device, "addr_assign_type"); | |
295 | if (!s) | |
f1ac7002 TG |
296 | return true; /* if we don't know, assume it is permanent */ |
297 | r = safe_atou(s, &type); | |
298 | if (r < 0) | |
299 | return true; | |
16b9b87a TG |
300 | |
301 | /* check for NET_ADDR_PERM */ | |
302 | return type == 0; | |
303 | } | |
304 | ||
9bf3b535 LP |
305 | #define HASH_KEY SD_ID128_MAKE(d3,1e,48,fa,90,fe,4b,4c,9d,af,d5,d7,a1,b1,2e,8a) |
306 | ||
5fde13d7 | 307 | static int get_mac(struct udev_device *device, bool want_random, struct ether_addr *mac) { |
9bf3b535 | 308 | int r; |
16b9b87a | 309 | |
16b9b87a | 310 | if (want_random) |
9bf3b535 | 311 | random_bytes(mac->ether_addr_octet, ETH_ALEN); |
16b9b87a TG |
312 | else { |
313 | const char *name; | |
9bf3b535 LP |
314 | uint8_t result[8]; |
315 | size_t l, sz; | |
316 | uint8_t *v; | |
16b9b87a TG |
317 | |
318 | /* fetch some persistent data unique (on this machine) to this device */ | |
319 | name = udev_device_get_property_value(device, "ID_NET_NAME_ONBOARD"); | |
320 | if (!name) { | |
321 | name = udev_device_get_property_value(device, "ID_NET_NAME_SLOT"); | |
322 | if (!name) { | |
323 | name = udev_device_get_property_value(device, "ID_NET_NAME_PATH"); | |
324 | if (!name) | |
55428d84 | 325 | return -ENOENT; |
16b9b87a TG |
326 | } |
327 | } | |
9bf3b535 LP |
328 | |
329 | l = strlen(name); | |
330 | sz = sizeof(sd_id128_t) + l; | |
331 | v = alloca(sz); | |
332 | ||
16b9b87a | 333 | /* fetch some persistent data unique to this machine */ |
9bf3b535 | 334 | r = sd_id128_get_machine((sd_id128_t*) v); |
16b9b87a | 335 | if (r < 0) |
55428d84 | 336 | return r; |
9bf3b535 | 337 | memcpy(v + sizeof(sd_id128_t), name, l); |
16b9b87a | 338 | |
9bf3b535 LP |
339 | /* Let's hash the machine ID plus the device name. We |
340 | * use a fixed, but originally randomly created hash | |
341 | * key here. */ | |
342 | siphash24(result, v, sz, HASH_KEY.bytes); | |
16b9b87a | 343 | |
9bf3b535 LP |
344 | assert_cc(ETH_ALEN <= sizeof(result)); |
345 | memcpy(mac->ether_addr_octet, result, ETH_ALEN); | |
16b9b87a TG |
346 | } |
347 | ||
348 | /* see eth_random_addr in the kernel */ | |
349 | mac->ether_addr_octet[0] &= 0xfe; /* clear multicast bit */ | |
350 | mac->ether_addr_octet[0] |= 0x02; /* set local assignment bit (IEEE802) */ | |
351 | ||
16b9b87a TG |
352 | return 0; |
353 | } | |
354 | ||
3e137a1b TG |
355 | int link_config_apply(link_config_ctx *ctx, link_config *config, struct udev_device *device, const char **name) { |
356 | const char *old_name; | |
5fde13d7 TG |
357 | const char *new_name = NULL; |
358 | struct ether_addr generated_mac; | |
16b9b87a | 359 | struct ether_addr *mac = NULL; |
43b3a5ef | 360 | int r, ifindex; |
af6f0d42 | 361 | |
3e137a1b TG |
362 | assert(ctx); |
363 | assert(config); | |
364 | assert(device); | |
365 | assert(name); | |
366 | ||
97708579 TG |
367 | r = link_config_ctx_connect(ctx); |
368 | if (r < 0) | |
369 | return r; | |
370 | ||
3e137a1b TG |
371 | old_name = udev_device_get_sysname(device); |
372 | if (!old_name) | |
af6f0d42 TG |
373 | return -EINVAL; |
374 | ||
3e137a1b | 375 | r = ethtool_set_speed(ctx->ethtool_fd, old_name, config->speed, config->duplex); |
5fde13d7 TG |
376 | if (r < 0) |
377 | log_warning("Could not set speed or duplex of %s to %u Mbytes (%s): %s", | |
3e137a1b | 378 | old_name, config->speed, duplex_to_string(config->duplex), strerror(-r)); |
a5010333 | 379 | |
3e137a1b | 380 | r = ethtool_set_wol(ctx->ethtool_fd, old_name, config->wol); |
5fde13d7 TG |
381 | if (r < 0) |
382 | log_warning("Could not set WakeOnLan of %s to %s: %s", | |
3e137a1b | 383 | old_name, wol_to_string(config->wol), strerror(-r)); |
af6f0d42 | 384 | |
43b3a5ef TG |
385 | ifindex = udev_device_get_ifindex(device); |
386 | if (ifindex <= 0) { | |
387 | log_warning("Could not find ifindex"); | |
388 | return -ENODEV; | |
389 | } | |
390 | ||
f6194225 | 391 | if (ctx->enable_name_policy && config->name_policy) { |
5fde13d7 | 392 | NamePolicy *policy; |
daeb71a3 | 393 | |
5fde13d7 TG |
394 | for (policy = config->name_policy; !new_name && *policy != _NAMEPOLICY_INVALID; policy++) { |
395 | switch (*policy) { | |
396 | case NAMEPOLICY_ONBOARD: | |
397 | new_name = udev_device_get_property_value(device, "ID_NET_NAME_ONBOARD"); | |
daeb71a3 | 398 | break; |
5fde13d7 TG |
399 | case NAMEPOLICY_SLOT: |
400 | new_name = udev_device_get_property_value(device, "ID_NET_NAME_SLOT"); | |
daeb71a3 | 401 | break; |
5fde13d7 TG |
402 | case NAMEPOLICY_PATH: |
403 | new_name = udev_device_get_property_value(device, "ID_NET_NAME_PATH"); | |
daeb71a3 | 404 | break; |
5fde13d7 TG |
405 | case NAMEPOLICY_MAC: |
406 | new_name = udev_device_get_property_value(device, "ID_NET_NAME_MAC"); | |
daeb71a3 | 407 | break; |
5fde13d7 TG |
408 | default: |
409 | break; | |
410 | } | |
daeb71a3 TG |
411 | } |
412 | } | |
413 | ||
3e137a1b TG |
414 | if (new_name) |
415 | *name = new_name; /* a name was set by a policy */ | |
416 | else if (config->name) | |
417 | *name = config->name; /* a name was set manually in the config */ | |
418 | else | |
419 | *name = NULL; | |
daeb71a3 | 420 | |
5fde13d7 TG |
421 | switch (config->mac_policy) { |
422 | case MACPOLICY_PERSISTENT: | |
16b9b87a | 423 | if (!mac_is_permanent(device)) { |
5fde13d7 | 424 | r = get_mac(device, false, &generated_mac); |
16b9b87a TG |
425 | if (r < 0) |
426 | return r; | |
5fde13d7 | 427 | mac = &generated_mac; |
16b9b87a | 428 | } |
5fde13d7 TG |
429 | break; |
430 | case MACPOLICY_RANDOM: | |
16b9b87a | 431 | if (!mac_is_random(device)) { |
5fde13d7 | 432 | r = get_mac(device, true, &generated_mac); |
16b9b87a TG |
433 | if (r < 0) |
434 | return r; | |
5fde13d7 | 435 | mac = &generated_mac; |
16b9b87a | 436 | } |
5fde13d7 TG |
437 | break; |
438 | default: | |
439 | mac = config->mac; | |
16b9b87a TG |
440 | } |
441 | ||
d2df0d0e | 442 | r = rtnl_set_link_properties(ctx->rtnl, ifindex, config->alias, mac, config->mtu); |
43b3a5ef | 443 | if (r < 0) { |
d2df0d0e | 444 | log_warning("Could not set Alias, MACAddress or MTU on %s: %s", old_name, strerror(-r)); |
5fde13d7 | 445 | return r; |
43b3a5ef TG |
446 | } |
447 | ||
af6f0d42 TG |
448 | return 0; |
449 | } | |
be32eb9b TG |
450 | |
451 | static const char* const mac_policy_table[] = { | |
452 | [MACPOLICY_PERSISTENT] = "persistent", | |
453 | [MACPOLICY_RANDOM] = "random" | |
454 | }; | |
455 | ||
456 | DEFINE_STRING_TABLE_LOOKUP(mac_policy, MACPolicy); | |
457 | DEFINE_CONFIG_PARSE_ENUM(config_parse_mac_policy, mac_policy, MACPolicy, "Failed to parse MAC address policy"); | |
458 | ||
459 | static const char* const name_policy_table[] = { | |
460 | [NAMEPOLICY_ONBOARD] = "onboard", | |
461 | [NAMEPOLICY_SLOT] = "slot", | |
462 | [NAMEPOLICY_PATH] = "path", | |
463 | [NAMEPOLICY_MAC] = "mac" | |
464 | }; | |
465 | ||
466 | DEFINE_STRING_TABLE_LOOKUP(name_policy, NamePolicy); | |
467 | DEFINE_CONFIG_PARSE_ENUMV(config_parse_name_policy, name_policy, NamePolicy, _NAMEPOLICY_INVALID, "Failed to parse interface name policy"); |