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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" |
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 | ||
97708579 TG |
90 | static int link_config_ctx_connect(link_config_ctx *ctx) { |
91 | int r; | |
92 | ||
847a8a5f TG |
93 | if (ctx->ethtool_fd == -1) { |
94 | r = ethtool_connect(&ctx->ethtool_fd); | |
866ee368 TG |
95 | if (r < 0) { |
96 | log_warning("link_config: could not connect to ethtool: %s", | |
97 | strerror(-r)); | |
847a8a5f | 98 | return r; |
866ee368 | 99 | } |
847a8a5f | 100 | } |
97708579 | 101 | |
847a8a5f TG |
102 | if (!ctx->rtnl) { |
103 | r = sd_rtnl_open(&ctx->rtnl, 0); | |
866ee368 TG |
104 | if (r < 0) { |
105 | log_warning("link_config: could not connect to rtnl: %s", | |
106 | strerror(-r)); | |
847a8a5f | 107 | return r; |
866ee368 | 108 | } |
847a8a5f | 109 | } |
97708579 TG |
110 | |
111 | return 0; | |
112 | } | |
113 | ||
af6f0d42 TG |
114 | static void link_configs_free(link_config_ctx *ctx) { |
115 | link_config *link, *link_next; | |
116 | ||
117 | if (!ctx) | |
118 | return; | |
119 | ||
120 | LIST_FOREACH_SAFE(links, link, link_next, ctx->links) { | |
121 | free(link->filename); | |
122 | free(link->match_path); | |
123 | free(link->match_driver); | |
124 | free(link->match_type); | |
125 | free(link->description); | |
d2df0d0e | 126 | free(link->alias); |
edf029b7 | 127 | free(link->name_policy); |
af6f0d42 TG |
128 | |
129 | free(link); | |
130 | } | |
131 | } | |
132 | ||
133 | void link_config_ctx_free(link_config_ctx *ctx) { | |
134 | if (!ctx) | |
135 | return; | |
136 | ||
03e334a1 | 137 | safe_close(ctx->ethtool_fd); |
43b3a5ef TG |
138 | |
139 | sd_rtnl_unref(ctx->rtnl); | |
140 | ||
af6f0d42 TG |
141 | link_configs_free(ctx); |
142 | ||
143 | free(ctx); | |
144 | ||
145 | return; | |
146 | } | |
147 | ||
148 | static int load_link(link_config_ctx *ctx, const char *filename) { | |
ecb08ec6 | 149 | _cleanup_free_ link_config *link = NULL; |
6e37cd2f | 150 | _cleanup_fclose_ FILE *file = NULL; |
af6f0d42 TG |
151 | int r; |
152 | ||
187dc6e5 TA |
153 | assert(ctx); |
154 | assert(filename); | |
155 | ||
6916ec29 TG |
156 | if (null_or_empty_path(filename)) { |
157 | log_debug("skipping empty file: %s", filename); | |
158 | return 0; | |
159 | } | |
160 | ||
af6f0d42 TG |
161 | file = fopen(filename, "re"); |
162 | if (!file) { | |
163 | if (errno == ENOENT) | |
164 | return 0; | |
165 | else | |
ecb08ec6 | 166 | return -errno; |
af6f0d42 TG |
167 | } |
168 | ||
169 | link = new0(link_config, 1); | |
ecb08ec6 ZJS |
170 | if (!link) |
171 | return log_oom(); | |
af6f0d42 | 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)); |
ecb08ec6 | 181 | return r; |
af6f0d42 | 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); | |
ecb08ec6 | 188 | link = NULL; |
af6f0d42 TG |
189 | |
190 | return 0; | |
af6f0d42 TG |
191 | } |
192 | ||
f6194225 | 193 | static bool enable_name_policy(void) { |
f8a0bb52 | 194 | _cleanup_free_ char *line = NULL; |
f6194225 TG |
195 | char *w, *state; |
196 | int r; | |
197 | size_t l; | |
198 | ||
74df0fca LP |
199 | r = proc_cmdline(&line); |
200 | if (r < 0) | |
f6194225 | 201 | log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r)); |
74df0fca LP |
202 | if (r <= 0) |
203 | return true; | |
f6194225 TG |
204 | |
205 | FOREACH_WORD_QUOTED(w, l, line, state) | |
ff83aac3 | 206 | if (strneq(w, "net.ifnames=0", l)) |
f6194225 TG |
207 | return false; |
208 | ||
209 | return true; | |
210 | } | |
211 | ||
af6f0d42 TG |
212 | int link_config_load(link_config_ctx *ctx) { |
213 | int r; | |
edf029b7 TG |
214 | _cleanup_strv_free_ char **files; |
215 | char **f; | |
af6f0d42 TG |
216 | |
217 | link_configs_free(ctx); | |
218 | ||
f6194225 TG |
219 | if (!enable_name_policy()) { |
220 | ctx->enable_name_policy = false; | |
221 | log_info("Network interface NamePolicy= disabled on kernel commandline, ignoring."); | |
222 | } | |
223 | ||
97f2d76d | 224 | /* update timestamp */ |
2ad8416d | 225 | paths_check_timestamp(link_dirs, &ctx->link_dirs_ts_usec, true); |
af6f0d42 | 226 | |
2ad8416d | 227 | r = conf_files_list_strv(&files, ".link", NULL, link_dirs); |
af6f0d42 TG |
228 | if (r < 0) { |
229 | log_error("failed to enumerate link files: %s", strerror(-r)); | |
230 | return r; | |
231 | } | |
232 | ||
233 | STRV_FOREACH_BACKWARDS(f, files) { | |
234 | r = load_link(ctx, *f); | |
235 | if (r < 0) | |
236 | return r; | |
237 | } | |
238 | ||
239 | return 0; | |
240 | } | |
241 | ||
242 | bool link_config_should_reload(link_config_ctx *ctx) { | |
2ad8416d | 243 | return paths_check_timestamp(link_dirs, &ctx->link_dirs_ts_usec, false); |
af6f0d42 TG |
244 | } |
245 | ||
af6f0d42 TG |
246 | int link_config_get(link_config_ctx *ctx, struct udev_device *device, link_config **ret) { |
247 | link_config *link; | |
248 | ||
249 | LIST_FOREACH(links, link, ctx->links) { | |
b3e01314 | 250 | |
edbb03e9 TG |
251 | if (net_match_config(link->match_mac, link->match_path, link->match_driver, |
252 | link->match_type, NULL, link->match_host, | |
253 | link->match_virt, link->match_kernel, link->match_arch, | |
505f8da7 | 254 | ether_aton(udev_device_get_sysattr_value(device, "address")), |
b3e01314 | 255 | udev_device_get_property_value(device, "ID_PATH"), |
9b1c2626 | 256 | udev_device_get_driver(udev_device_get_parent(device)), |
bf175aaf | 257 | udev_device_get_property_value(device, "ID_NET_DRIVER"), |
b3e01314 TG |
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 | ||
5fde13d7 | 289 | static int get_mac(struct udev_device *device, bool want_random, struct ether_addr *mac) { |
9bf3b535 | 290 | int r; |
16b9b87a | 291 | |
16b9b87a | 292 | if (want_random) |
9bf3b535 | 293 | random_bytes(mac->ether_addr_octet, ETH_ALEN); |
16b9b87a | 294 | else { |
9bf3b535 | 295 | uint8_t result[8]; |
9bf3b535 | 296 | |
b5db00e5 | 297 | r = net_get_unique_predictable_data(device, result); |
16b9b87a | 298 | if (r < 0) |
55428d84 | 299 | return r; |
16b9b87a | 300 | |
9bf3b535 LP |
301 | assert_cc(ETH_ALEN <= sizeof(result)); |
302 | memcpy(mac->ether_addr_octet, result, ETH_ALEN); | |
16b9b87a TG |
303 | } |
304 | ||
305 | /* see eth_random_addr in the kernel */ | |
306 | mac->ether_addr_octet[0] &= 0xfe; /* clear multicast bit */ | |
307 | mac->ether_addr_octet[0] |= 0x02; /* set local assignment bit (IEEE802) */ | |
308 | ||
16b9b87a TG |
309 | return 0; |
310 | } | |
311 | ||
3e137a1b TG |
312 | int link_config_apply(link_config_ctx *ctx, link_config *config, struct udev_device *device, const char **name) { |
313 | const char *old_name; | |
5fde13d7 TG |
314 | const char *new_name = NULL; |
315 | struct ether_addr generated_mac; | |
16b9b87a | 316 | struct ether_addr *mac = NULL; |
43b3a5ef | 317 | int r, ifindex; |
af6f0d42 | 318 | |
3e137a1b TG |
319 | assert(ctx); |
320 | assert(config); | |
321 | assert(device); | |
322 | assert(name); | |
323 | ||
97708579 TG |
324 | r = link_config_ctx_connect(ctx); |
325 | if (r < 0) | |
326 | return r; | |
327 | ||
3e137a1b TG |
328 | old_name = udev_device_get_sysname(device); |
329 | if (!old_name) | |
af6f0d42 TG |
330 | return -EINVAL; |
331 | ||
733f7a2c | 332 | r = ethtool_set_speed(ctx->ethtool_fd, old_name, config->speed / 1024, config->duplex); |
5fde13d7 | 333 | if (r < 0) |
733f7a2c TG |
334 | log_warning("Could not set speed or duplex of %s to %u Mbps (%s): %s", |
335 | old_name, config->speed / 1024, duplex_to_string(config->duplex), | |
336 | strerror(-r)); | |
a5010333 | 337 | |
3e137a1b | 338 | r = ethtool_set_wol(ctx->ethtool_fd, old_name, config->wol); |
5fde13d7 TG |
339 | if (r < 0) |
340 | log_warning("Could not set WakeOnLan of %s to %s: %s", | |
3e137a1b | 341 | old_name, wol_to_string(config->wol), strerror(-r)); |
af6f0d42 | 342 | |
43b3a5ef TG |
343 | ifindex = udev_device_get_ifindex(device); |
344 | if (ifindex <= 0) { | |
345 | log_warning("Could not find ifindex"); | |
346 | return -ENODEV; | |
347 | } | |
348 | ||
f6194225 | 349 | if (ctx->enable_name_policy && config->name_policy) { |
5fde13d7 | 350 | NamePolicy *policy; |
daeb71a3 | 351 | |
5fde13d7 TG |
352 | for (policy = config->name_policy; !new_name && *policy != _NAMEPOLICY_INVALID; policy++) { |
353 | switch (*policy) { | |
e51660ae TG |
354 | case NAMEPOLICY_DATABASE: |
355 | new_name = udev_device_get_property_value(device, "ID_NET_NAME_FROM_DATABASE"); | |
356 | break; | |
5fde13d7 TG |
357 | case NAMEPOLICY_ONBOARD: |
358 | new_name = udev_device_get_property_value(device, "ID_NET_NAME_ONBOARD"); | |
daeb71a3 | 359 | break; |
5fde13d7 TG |
360 | case NAMEPOLICY_SLOT: |
361 | new_name = udev_device_get_property_value(device, "ID_NET_NAME_SLOT"); | |
daeb71a3 | 362 | break; |
5fde13d7 TG |
363 | case NAMEPOLICY_PATH: |
364 | new_name = udev_device_get_property_value(device, "ID_NET_NAME_PATH"); | |
daeb71a3 | 365 | break; |
5fde13d7 TG |
366 | case NAMEPOLICY_MAC: |
367 | new_name = udev_device_get_property_value(device, "ID_NET_NAME_MAC"); | |
daeb71a3 | 368 | break; |
5fde13d7 TG |
369 | default: |
370 | break; | |
371 | } | |
daeb71a3 TG |
372 | } |
373 | } | |
374 | ||
3e137a1b TG |
375 | if (new_name) |
376 | *name = new_name; /* a name was set by a policy */ | |
377 | else if (config->name) | |
378 | *name = config->name; /* a name was set manually in the config */ | |
379 | else | |
380 | *name = NULL; | |
daeb71a3 | 381 | |
5fde13d7 TG |
382 | switch (config->mac_policy) { |
383 | case MACPOLICY_PERSISTENT: | |
92d927f8 | 384 | if (mac_is_random(device)) { |
5fde13d7 | 385 | r = get_mac(device, false, &generated_mac); |
a669ea98 TG |
386 | if (r == -ENOENT) |
387 | break; | |
388 | else if (r < 0) | |
16b9b87a | 389 | return r; |
5fde13d7 | 390 | mac = &generated_mac; |
16b9b87a | 391 | } |
5fde13d7 TG |
392 | break; |
393 | case MACPOLICY_RANDOM: | |
16b9b87a | 394 | if (!mac_is_random(device)) { |
5fde13d7 | 395 | r = get_mac(device, true, &generated_mac); |
a669ea98 TG |
396 | if (r == -ENOENT) |
397 | break; | |
398 | else if (r < 0) | |
16b9b87a | 399 | return r; |
5fde13d7 | 400 | mac = &generated_mac; |
16b9b87a | 401 | } |
5fde13d7 TG |
402 | break; |
403 | default: | |
404 | mac = config->mac; | |
16b9b87a TG |
405 | } |
406 | ||
d2df0d0e | 407 | r = rtnl_set_link_properties(ctx->rtnl, ifindex, config->alias, mac, config->mtu); |
43b3a5ef | 408 | if (r < 0) { |
d2df0d0e | 409 | log_warning("Could not set Alias, MACAddress or MTU on %s: %s", old_name, strerror(-r)); |
5fde13d7 | 410 | return r; |
43b3a5ef TG |
411 | } |
412 | ||
af6f0d42 TG |
413 | return 0; |
414 | } | |
be32eb9b | 415 | |
847a8a5f TG |
416 | int link_get_driver(link_config_ctx *ctx, struct udev_device *device, char **ret) { |
417 | const char *name; | |
418 | char *driver; | |
419 | int r; | |
420 | ||
421 | r = link_config_ctx_connect(ctx); | |
422 | if (r < 0) | |
423 | return r; | |
424 | ||
425 | name = udev_device_get_sysname(device); | |
426 | if (!name) | |
427 | return -EINVAL; | |
428 | ||
429 | r = ethtool_get_driver(ctx->ethtool_fd, name, &driver); | |
430 | if (r < 0) | |
431 | return r; | |
432 | ||
433 | *ret = driver; | |
434 | return 0; | |
435 | } | |
436 | ||
2c5859af | 437 | static const char* const mac_policy_table[_MACPOLICY_MAX] = { |
be32eb9b TG |
438 | [MACPOLICY_PERSISTENT] = "persistent", |
439 | [MACPOLICY_RANDOM] = "random" | |
440 | }; | |
441 | ||
442 | DEFINE_STRING_TABLE_LOOKUP(mac_policy, MACPolicy); | |
443 | DEFINE_CONFIG_PARSE_ENUM(config_parse_mac_policy, mac_policy, MACPolicy, "Failed to parse MAC address policy"); | |
444 | ||
2c5859af | 445 | static const char* const name_policy_table[_NAMEPOLICY_MAX] = { |
e51660ae | 446 | [NAMEPOLICY_DATABASE] = "database", |
be32eb9b TG |
447 | [NAMEPOLICY_ONBOARD] = "onboard", |
448 | [NAMEPOLICY_SLOT] = "slot", | |
449 | [NAMEPOLICY_PATH] = "path", | |
450 | [NAMEPOLICY_MAC] = "mac" | |
451 | }; | |
452 | ||
453 | DEFINE_STRING_TABLE_LOOKUP(name_policy, NamePolicy); | |
454 | DEFINE_CONFIG_PARSE_ENUMV(config_parse_name_policy, name_policy, NamePolicy, _NAMEPOLICY_INVALID, "Failed to parse interface name policy"); |