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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 | ||
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 | ||
97708579 TG |
90 | static int link_config_ctx_connect(link_config_ctx *ctx) { |
91 | int r; | |
92 | ||
93 | if (ctx->ethtool_fd >= 0 && ctx->rtnl) | |
94 | return 0; | |
95 | ||
96 | r = ethtool_connect(&ctx->ethtool_fd); | |
97 | if (r < 0) | |
98 | return r; | |
99 | ||
151b9b96 | 100 | r = sd_rtnl_open(&ctx->rtnl, 0); |
97708579 TG |
101 | if (r < 0) |
102 | return r; | |
103 | ||
104 | return 0; | |
105 | } | |
106 | ||
af6f0d42 TG |
107 | static void link_configs_free(link_config_ctx *ctx) { |
108 | link_config *link, *link_next; | |
109 | ||
110 | if (!ctx) | |
111 | return; | |
112 | ||
113 | LIST_FOREACH_SAFE(links, link, link_next, ctx->links) { | |
114 | free(link->filename); | |
115 | free(link->match_path); | |
116 | free(link->match_driver); | |
117 | free(link->match_type); | |
118 | free(link->description); | |
d2df0d0e | 119 | free(link->alias); |
af6f0d42 TG |
120 | |
121 | free(link); | |
122 | } | |
123 | } | |
124 | ||
125 | void link_config_ctx_free(link_config_ctx *ctx) { | |
126 | if (!ctx) | |
127 | return; | |
128 | ||
43b3a5ef TG |
129 | if (ctx->ethtool_fd >= 0) |
130 | close_nointr_nofail(ctx->ethtool_fd); | |
131 | ||
132 | sd_rtnl_unref(ctx->rtnl); | |
133 | ||
af6f0d42 TG |
134 | link_configs_free(ctx); |
135 | ||
136 | free(ctx); | |
137 | ||
138 | return; | |
139 | } | |
140 | ||
141 | static int load_link(link_config_ctx *ctx, const char *filename) { | |
142 | link_config *link; | |
2fd069b1 | 143 | _cleanup_fclose_ FILE *file; |
af6f0d42 TG |
144 | int r; |
145 | ||
187dc6e5 TA |
146 | assert(ctx); |
147 | assert(filename); | |
148 | ||
af6f0d42 TG |
149 | file = fopen(filename, "re"); |
150 | if (!file) { | |
151 | if (errno == ENOENT) | |
152 | return 0; | |
153 | else | |
154 | return errno; | |
155 | } | |
156 | ||
157 | link = new0(link_config, 1); | |
158 | if (!link) { | |
159 | r = log_oom(); | |
160 | goto failure; | |
161 | } | |
162 | ||
5fde13d7 TG |
163 | link->mac_policy = _MACPOLICY_INVALID; |
164 | link->wol = _WOL_INVALID; | |
165 | link->duplex = _DUP_INVALID; | |
166 | ||
af6f0d42 TG |
167 | r = config_parse(NULL, filename, file, "Match\0Link\0Ethernet\0", config_item_perf_lookup, |
168 | (void*) link_config_gperf_lookup, false, false, link); | |
169 | if (r < 0) { | |
48912436 | 170 | log_warning("Could not parse config file %s: %s", filename, strerror(-r)); |
af6f0d42 TG |
171 | goto failure; |
172 | } else | |
98a375f6 | 173 | log_debug("Parsed configuration file %s", filename); |
af6f0d42 TG |
174 | |
175 | link->filename = strdup(filename); | |
176 | ||
177 | LIST_PREPEND(links, ctx->links, link); | |
178 | ||
179 | return 0; | |
180 | ||
181 | failure: | |
182 | free(link); | |
183 | return r; | |
184 | } | |
185 | ||
f6194225 TG |
186 | static bool enable_name_policy(void) { |
187 | _cleanup_free_ char *line; | |
188 | char *w, *state; | |
189 | int r; | |
190 | size_t l; | |
191 | ||
74df0fca LP |
192 | r = proc_cmdline(&line); |
193 | if (r < 0) | |
f6194225 | 194 | log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r)); |
74df0fca LP |
195 | if (r <= 0) |
196 | return true; | |
f6194225 TG |
197 | |
198 | FOREACH_WORD_QUOTED(w, l, line, state) | |
ff83aac3 | 199 | if (strneq(w, "net.ifnames=0", l)) |
f6194225 TG |
200 | return false; |
201 | ||
202 | return true; | |
203 | } | |
204 | ||
af6f0d42 TG |
205 | int link_config_load(link_config_ctx *ctx) { |
206 | int r; | |
207 | char **files, **f; | |
208 | ||
209 | link_configs_free(ctx); | |
210 | ||
f6194225 TG |
211 | if (!enable_name_policy()) { |
212 | ctx->enable_name_policy = false; | |
213 | log_info("Network interface NamePolicy= disabled on kernel commandline, ignoring."); | |
214 | } | |
215 | ||
97f2d76d | 216 | /* update timestamp */ |
2ad8416d | 217 | paths_check_timestamp(link_dirs, &ctx->link_dirs_ts_usec, true); |
af6f0d42 | 218 | |
2ad8416d | 219 | r = conf_files_list_strv(&files, ".link", NULL, link_dirs); |
af6f0d42 TG |
220 | if (r < 0) { |
221 | log_error("failed to enumerate link files: %s", strerror(-r)); | |
222 | return r; | |
223 | } | |
224 | ||
225 | STRV_FOREACH_BACKWARDS(f, files) { | |
226 | r = load_link(ctx, *f); | |
227 | if (r < 0) | |
228 | return r; | |
229 | } | |
230 | ||
231 | return 0; | |
232 | } | |
233 | ||
234 | bool link_config_should_reload(link_config_ctx *ctx) { | |
2ad8416d | 235 | return paths_check_timestamp(link_dirs, &ctx->link_dirs_ts_usec, false); |
af6f0d42 TG |
236 | } |
237 | ||
af6f0d42 TG |
238 | int link_config_get(link_config_ctx *ctx, struct udev_device *device, link_config **ret) { |
239 | link_config *link; | |
240 | ||
241 | LIST_FOREACH(links, link, ctx->links) { | |
b3e01314 | 242 | |
be32eb9b | 243 | if (net_match_config(link->match_mac, link->match_path, |
b3e01314 | 244 | link->match_driver, link->match_type, NULL, |
2cc412b5 | 245 | link->match_host, link->match_virt, link->match_kernel, |
b3e01314 TG |
246 | udev_device_get_sysattr_value(device, "address"), |
247 | udev_device_get_property_value(device, "ID_PATH"), | |
9b1c2626 | 248 | udev_device_get_driver(udev_device_get_parent(device)), |
b3e01314 TG |
249 | udev_device_get_devtype(device), |
250 | NULL)) { | |
be32eb9b TG |
251 | log_debug("Config file %s applies to device %s", |
252 | link->filename, | |
253 | udev_device_get_sysname(device)); | |
af6f0d42 TG |
254 | *ret = link; |
255 | return 0; | |
256 | } | |
257 | } | |
258 | ||
be32eb9b TG |
259 | *ret = NULL; |
260 | ||
af6f0d42 TG |
261 | return -ENOENT; |
262 | } | |
263 | ||
16b9b87a TG |
264 | static bool mac_is_random(struct udev_device *device) { |
265 | const char *s; | |
f1ac7002 TG |
266 | unsigned type; |
267 | int r; | |
16b9b87a TG |
268 | |
269 | s = udev_device_get_sysattr_value(device, "addr_assign_type"); | |
270 | if (!s) | |
f1ac7002 TG |
271 | return false; /* if we don't know, assume it is not random */ |
272 | r = safe_atou(s, &type); | |
273 | if (r < 0) | |
274 | return false; | |
16b9b87a TG |
275 | |
276 | /* check for NET_ADDR_RANDOM */ | |
277 | return type == 1; | |
278 | } | |
279 | ||
280 | static bool mac_is_permanent(struct udev_device *device) { | |
281 | const char *s; | |
f1ac7002 TG |
282 | unsigned type; |
283 | int r; | |
16b9b87a TG |
284 | |
285 | s = udev_device_get_sysattr_value(device, "addr_assign_type"); | |
286 | if (!s) | |
f1ac7002 TG |
287 | return true; /* if we don't know, assume it is permanent */ |
288 | r = safe_atou(s, &type); | |
289 | if (r < 0) | |
290 | return true; | |
16b9b87a TG |
291 | |
292 | /* check for NET_ADDR_PERM */ | |
293 | return type == 0; | |
294 | } | |
295 | ||
9bf3b535 LP |
296 | #define HASH_KEY SD_ID128_MAKE(d3,1e,48,fa,90,fe,4b,4c,9d,af,d5,d7,a1,b1,2e,8a) |
297 | ||
5fde13d7 | 298 | static int get_mac(struct udev_device *device, bool want_random, struct ether_addr *mac) { |
9bf3b535 | 299 | int r; |
16b9b87a | 300 | |
16b9b87a | 301 | if (want_random) |
9bf3b535 | 302 | random_bytes(mac->ether_addr_octet, ETH_ALEN); |
16b9b87a TG |
303 | else { |
304 | const char *name; | |
9bf3b535 LP |
305 | uint8_t result[8]; |
306 | size_t l, sz; | |
307 | uint8_t *v; | |
16b9b87a TG |
308 | |
309 | /* fetch some persistent data unique (on this machine) to this device */ | |
310 | name = udev_device_get_property_value(device, "ID_NET_NAME_ONBOARD"); | |
311 | if (!name) { | |
312 | name = udev_device_get_property_value(device, "ID_NET_NAME_SLOT"); | |
313 | if (!name) { | |
314 | name = udev_device_get_property_value(device, "ID_NET_NAME_PATH"); | |
315 | if (!name) | |
55428d84 | 316 | return -ENOENT; |
16b9b87a TG |
317 | } |
318 | } | |
9bf3b535 LP |
319 | |
320 | l = strlen(name); | |
321 | sz = sizeof(sd_id128_t) + l; | |
322 | v = alloca(sz); | |
323 | ||
16b9b87a | 324 | /* fetch some persistent data unique to this machine */ |
9bf3b535 | 325 | r = sd_id128_get_machine((sd_id128_t*) v); |
16b9b87a | 326 | if (r < 0) |
55428d84 | 327 | return r; |
9bf3b535 | 328 | memcpy(v + sizeof(sd_id128_t), name, l); |
16b9b87a | 329 | |
9bf3b535 LP |
330 | /* Let's hash the machine ID plus the device name. We |
331 | * use a fixed, but originally randomly created hash | |
332 | * key here. */ | |
333 | siphash24(result, v, sz, HASH_KEY.bytes); | |
16b9b87a | 334 | |
9bf3b535 LP |
335 | assert_cc(ETH_ALEN <= sizeof(result)); |
336 | memcpy(mac->ether_addr_octet, result, ETH_ALEN); | |
16b9b87a TG |
337 | } |
338 | ||
339 | /* see eth_random_addr in the kernel */ | |
340 | mac->ether_addr_octet[0] &= 0xfe; /* clear multicast bit */ | |
341 | mac->ether_addr_octet[0] |= 0x02; /* set local assignment bit (IEEE802) */ | |
342 | ||
16b9b87a TG |
343 | return 0; |
344 | } | |
345 | ||
3e137a1b TG |
346 | int link_config_apply(link_config_ctx *ctx, link_config *config, struct udev_device *device, const char **name) { |
347 | const char *old_name; | |
5fde13d7 TG |
348 | const char *new_name = NULL; |
349 | struct ether_addr generated_mac; | |
16b9b87a | 350 | struct ether_addr *mac = NULL; |
43b3a5ef | 351 | int r, ifindex; |
af6f0d42 | 352 | |
3e137a1b TG |
353 | assert(ctx); |
354 | assert(config); | |
355 | assert(device); | |
356 | assert(name); | |
357 | ||
97708579 TG |
358 | r = link_config_ctx_connect(ctx); |
359 | if (r < 0) | |
360 | return r; | |
361 | ||
3e137a1b TG |
362 | old_name = udev_device_get_sysname(device); |
363 | if (!old_name) | |
af6f0d42 TG |
364 | return -EINVAL; |
365 | ||
3e137a1b | 366 | r = ethtool_set_speed(ctx->ethtool_fd, old_name, config->speed, config->duplex); |
5fde13d7 TG |
367 | if (r < 0) |
368 | log_warning("Could not set speed or duplex of %s to %u Mbytes (%s): %s", | |
3e137a1b | 369 | old_name, config->speed, duplex_to_string(config->duplex), strerror(-r)); |
a5010333 | 370 | |
3e137a1b | 371 | r = ethtool_set_wol(ctx->ethtool_fd, old_name, config->wol); |
5fde13d7 TG |
372 | if (r < 0) |
373 | log_warning("Could not set WakeOnLan of %s to %s: %s", | |
3e137a1b | 374 | old_name, wol_to_string(config->wol), strerror(-r)); |
af6f0d42 | 375 | |
43b3a5ef TG |
376 | ifindex = udev_device_get_ifindex(device); |
377 | if (ifindex <= 0) { | |
378 | log_warning("Could not find ifindex"); | |
379 | return -ENODEV; | |
380 | } | |
381 | ||
f6194225 | 382 | if (ctx->enable_name_policy && config->name_policy) { |
5fde13d7 | 383 | NamePolicy *policy; |
daeb71a3 | 384 | |
5fde13d7 TG |
385 | for (policy = config->name_policy; !new_name && *policy != _NAMEPOLICY_INVALID; policy++) { |
386 | switch (*policy) { | |
e51660ae TG |
387 | case NAMEPOLICY_DATABASE: |
388 | new_name = udev_device_get_property_value(device, "ID_NET_NAME_FROM_DATABASE"); | |
389 | break; | |
5fde13d7 TG |
390 | case NAMEPOLICY_ONBOARD: |
391 | new_name = udev_device_get_property_value(device, "ID_NET_NAME_ONBOARD"); | |
daeb71a3 | 392 | break; |
5fde13d7 TG |
393 | case NAMEPOLICY_SLOT: |
394 | new_name = udev_device_get_property_value(device, "ID_NET_NAME_SLOT"); | |
daeb71a3 | 395 | break; |
5fde13d7 TG |
396 | case NAMEPOLICY_PATH: |
397 | new_name = udev_device_get_property_value(device, "ID_NET_NAME_PATH"); | |
daeb71a3 | 398 | break; |
5fde13d7 TG |
399 | case NAMEPOLICY_MAC: |
400 | new_name = udev_device_get_property_value(device, "ID_NET_NAME_MAC"); | |
daeb71a3 | 401 | break; |
5fde13d7 TG |
402 | default: |
403 | break; | |
404 | } | |
daeb71a3 TG |
405 | } |
406 | } | |
407 | ||
3e137a1b TG |
408 | if (new_name) |
409 | *name = new_name; /* a name was set by a policy */ | |
410 | else if (config->name) | |
411 | *name = config->name; /* a name was set manually in the config */ | |
412 | else | |
413 | *name = NULL; | |
daeb71a3 | 414 | |
5fde13d7 TG |
415 | switch (config->mac_policy) { |
416 | case MACPOLICY_PERSISTENT: | |
16b9b87a | 417 | if (!mac_is_permanent(device)) { |
5fde13d7 | 418 | r = get_mac(device, false, &generated_mac); |
16b9b87a TG |
419 | if (r < 0) |
420 | return r; | |
5fde13d7 | 421 | mac = &generated_mac; |
16b9b87a | 422 | } |
5fde13d7 TG |
423 | break; |
424 | case MACPOLICY_RANDOM: | |
16b9b87a | 425 | if (!mac_is_random(device)) { |
5fde13d7 | 426 | r = get_mac(device, true, &generated_mac); |
16b9b87a TG |
427 | if (r < 0) |
428 | return r; | |
5fde13d7 | 429 | mac = &generated_mac; |
16b9b87a | 430 | } |
5fde13d7 TG |
431 | break; |
432 | default: | |
433 | mac = config->mac; | |
16b9b87a TG |
434 | } |
435 | ||
d2df0d0e | 436 | r = rtnl_set_link_properties(ctx->rtnl, ifindex, config->alias, mac, config->mtu); |
43b3a5ef | 437 | if (r < 0) { |
d2df0d0e | 438 | log_warning("Could not set Alias, MACAddress or MTU on %s: %s", old_name, strerror(-r)); |
5fde13d7 | 439 | return r; |
43b3a5ef TG |
440 | } |
441 | ||
af6f0d42 TG |
442 | return 0; |
443 | } | |
be32eb9b TG |
444 | |
445 | static const char* const mac_policy_table[] = { | |
446 | [MACPOLICY_PERSISTENT] = "persistent", | |
447 | [MACPOLICY_RANDOM] = "random" | |
448 | }; | |
449 | ||
450 | DEFINE_STRING_TABLE_LOOKUP(mac_policy, MACPolicy); | |
451 | DEFINE_CONFIG_PARSE_ENUM(config_parse_mac_policy, mac_policy, MACPolicy, "Failed to parse MAC address policy"); | |
452 | ||
453 | static const char* const name_policy_table[] = { | |
e51660ae | 454 | [NAMEPOLICY_DATABASE] = "database", |
be32eb9b TG |
455 | [NAMEPOLICY_ONBOARD] = "onboard", |
456 | [NAMEPOLICY_SLOT] = "slot", | |
457 | [NAMEPOLICY_PATH] = "path", | |
458 | [NAMEPOLICY_MAC] = "mac" | |
459 | }; | |
460 | ||
461 | DEFINE_STRING_TABLE_LOOKUP(name_policy, NamePolicy); | |
462 | DEFINE_CONFIG_PARSE_ENUMV(config_parse_name_policy, name_policy, NamePolicy, _NAMEPOLICY_INVALID, "Failed to parse interface name policy"); |