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52ad194e | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
60f067b4 JS |
2 | |
3 | #include <netinet/ether.h> | |
60f067b4 | 4 | |
6e866b33 | 5 | #include "sd-device.h" |
db2df898 | 6 | #include "sd-netlink.h" |
60f067b4 | 7 | |
db2df898 MP |
8 | #include "alloc-util.h" |
9 | #include "conf-files.h" | |
10 | #include "conf-parser.h" | |
6e866b33 | 11 | #include "device-util.h" |
60f067b4 | 12 | #include "ethtool-util.h" |
db2df898 | 13 | #include "fd-util.h" |
db2df898 | 14 | #include "link-config.h" |
60f067b4 | 15 | #include "log.h" |
6e866b33 | 16 | #include "missing_network.h" |
86f210e9 | 17 | #include "netlink-util.h" |
60f067b4 | 18 | #include "network-internal.h" |
db2df898 MP |
19 | #include "parse-util.h" |
20 | #include "path-util.h" | |
21 | #include "proc-cmdline.h" | |
e3bff60a | 22 | #include "random-util.h" |
db2df898 MP |
23 | #include "stat-util.h" |
24 | #include "string-table.h" | |
25 | #include "string-util.h" | |
26 | #include "strv.h" | |
27 | #include "util.h" | |
60f067b4 JS |
28 | |
29 | struct link_config_ctx { | |
30 | LIST_HEAD(link_config, links); | |
31 | ||
32 | int ethtool_fd; | |
33 | ||
34 | bool enable_name_policy; | |
35 | ||
86f210e9 | 36 | sd_netlink *rtnl; |
60f067b4 JS |
37 | |
38 | usec_t link_dirs_ts_usec; | |
39 | }; | |
40 | ||
41 | static const char* const link_dirs[] = { | |
42 | "/etc/systemd/network", | |
43 | "/run/systemd/network", | |
44 | "/usr/lib/systemd/network", | |
f5e65279 | 45 | #if HAVE_SPLIT_USR |
60f067b4 JS |
46 | "/lib/systemd/network", |
47 | #endif | |
48 | NULL}; | |
49 | ||
e735f4d4 MP |
50 | static void link_config_free(link_config *link) { |
51 | if (!link) | |
52 | return; | |
60f067b4 | 53 | |
e735f4d4 MP |
54 | free(link->filename); |
55 | ||
b012e921 | 56 | set_free_free(link->match_mac); |
e3bff60a MP |
57 | strv_free(link->match_path); |
58 | strv_free(link->match_driver); | |
59 | strv_free(link->match_type); | |
e735f4d4 MP |
60 | free(link->match_name); |
61 | free(link->match_host); | |
62 | free(link->match_virt); | |
1d42b86d MB |
63 | free(link->match_kernel_cmdline); |
64 | free(link->match_kernel_version); | |
e735f4d4 MP |
65 | free(link->match_arch); |
66 | ||
67 | free(link->description); | |
68 | free(link->mac); | |
69 | free(link->name_policy); | |
70 | free(link->name); | |
71 | free(link->alias); | |
72 | ||
73 | free(link); | |
60f067b4 JS |
74 | } |
75 | ||
e735f4d4 MP |
76 | DEFINE_TRIVIAL_CLEANUP_FUNC(link_config*, link_config_free); |
77 | ||
60f067b4 JS |
78 | static void link_configs_free(link_config_ctx *ctx) { |
79 | link_config *link, *link_next; | |
80 | ||
81 | if (!ctx) | |
82 | return; | |
83 | ||
e735f4d4 MP |
84 | LIST_FOREACH_SAFE(links, link, link_next, ctx->links) |
85 | link_config_free(link); | |
60f067b4 JS |
86 | } |
87 | ||
88 | void link_config_ctx_free(link_config_ctx *ctx) { | |
89 | if (!ctx) | |
90 | return; | |
91 | ||
92 | safe_close(ctx->ethtool_fd); | |
93 | ||
86f210e9 | 94 | sd_netlink_unref(ctx->rtnl); |
60f067b4 JS |
95 | |
96 | link_configs_free(ctx); | |
97 | ||
98 | free(ctx); | |
99 | ||
100 | return; | |
101 | } | |
102 | ||
e735f4d4 MP |
103 | DEFINE_TRIVIAL_CLEANUP_FUNC(link_config_ctx*, link_config_ctx_free); |
104 | ||
105 | int link_config_ctx_new(link_config_ctx **ret) { | |
106 | _cleanup_(link_config_ctx_freep) link_config_ctx *ctx = NULL; | |
107 | ||
108 | if (!ret) | |
109 | return -EINVAL; | |
110 | ||
111 | ctx = new0(link_config_ctx, 1); | |
112 | if (!ctx) | |
113 | return -ENOMEM; | |
114 | ||
115 | LIST_HEAD_INIT(ctx->links); | |
116 | ||
117 | ctx->ethtool_fd = -1; | |
118 | ||
119 | ctx->enable_name_policy = true; | |
120 | ||
b012e921 | 121 | *ret = TAKE_PTR(ctx); |
e735f4d4 MP |
122 | |
123 | return 0; | |
124 | } | |
125 | ||
60f067b4 | 126 | static int load_link(link_config_ctx *ctx, const char *filename) { |
e735f4d4 | 127 | _cleanup_(link_config_freep) link_config *link = NULL; |
60f067b4 | 128 | _cleanup_fclose_ FILE *file = NULL; |
6e866b33 | 129 | int i; |
60f067b4 JS |
130 | int r; |
131 | ||
132 | assert(ctx); | |
133 | assert(filename); | |
134 | ||
60f067b4 JS |
135 | file = fopen(filename, "re"); |
136 | if (!file) { | |
137 | if (errno == ENOENT) | |
138 | return 0; | |
139 | else | |
140 | return -errno; | |
141 | } | |
142 | ||
5eef597e MP |
143 | if (null_or_empty_fd(fileno(file))) { |
144 | log_debug("Skipping empty file: %s", filename); | |
145 | return 0; | |
146 | } | |
147 | ||
60f067b4 JS |
148 | link = new0(link_config, 1); |
149 | if (!link) | |
150 | return log_oom(); | |
151 | ||
152 | link->mac_policy = _MACPOLICY_INVALID; | |
153 | link->wol = _WOL_INVALID; | |
154 | link->duplex = _DUP_INVALID; | |
81c58355 | 155 | link->port = _NET_DEV_PORT_INVALID; |
2897b343 | 156 | link->autonegotiation = -1; |
60f067b4 | 157 | |
6e866b33 MB |
158 | for (i = 0; i < (int)ELEMENTSOF(link->features); i++) |
159 | link->features[i] = -1; | |
8a584da2 | 160 | |
5eef597e MP |
161 | r = config_parse(NULL, filename, file, |
162 | "Match\0Link\0Ethernet\0", | |
163 | config_item_perf_lookup, link_config_gperf_lookup, | |
52ad194e | 164 | CONFIG_PARSE_WARN, link); |
5eef597e | 165 | if (r < 0) |
60f067b4 | 166 | return r; |
5eef597e | 167 | else |
60f067b4 JS |
168 | log_debug("Parsed configuration file %s", filename); |
169 | ||
b012e921 | 170 | if (link->speed > UINT_MAX) |
e3bff60a MP |
171 | return -ERANGE; |
172 | ||
60f067b4 | 173 | link->filename = strdup(filename); |
1d42b86d MB |
174 | if (!link->filename) |
175 | return log_oom(); | |
60f067b4 JS |
176 | |
177 | LIST_PREPEND(links, ctx->links, link); | |
178 | link = NULL; | |
179 | ||
180 | return 0; | |
181 | } | |
182 | ||
183 | static bool enable_name_policy(void) { | |
2897b343 | 184 | bool b; |
60f067b4 | 185 | |
2897b343 | 186 | return proc_cmdline_get_bool("net.ifnames", &b) <= 0 || b; |
60f067b4 JS |
187 | } |
188 | ||
189 | int link_config_load(link_config_ctx *ctx) { | |
60f067b4 JS |
190 | _cleanup_strv_free_ char **files; |
191 | char **f; | |
2897b343 | 192 | int r; |
60f067b4 JS |
193 | |
194 | link_configs_free(ctx); | |
195 | ||
196 | if (!enable_name_policy()) { | |
197 | ctx->enable_name_policy = false; | |
f47781d8 | 198 | log_info("Network interface NamePolicy= disabled on kernel command line, ignoring."); |
60f067b4 JS |
199 | } |
200 | ||
201 | /* update timestamp */ | |
202 | paths_check_timestamp(link_dirs, &ctx->link_dirs_ts_usec, true); | |
203 | ||
f5e65279 | 204 | r = conf_files_list_strv(&files, ".link", NULL, 0, link_dirs); |
f47781d8 MP |
205 | if (r < 0) |
206 | return log_error_errno(r, "failed to enumerate link files: %m"); | |
60f067b4 JS |
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) { | |
218 | return paths_check_timestamp(link_dirs, &ctx->link_dirs_ts_usec, false); | |
219 | } | |
220 | ||
6e866b33 | 221 | int link_config_get(link_config_ctx *ctx, sd_device *device, link_config **ret) { |
60f067b4 JS |
222 | link_config *link; |
223 | ||
86f210e9 MP |
224 | assert(ctx); |
225 | assert(device); | |
226 | assert(ret); | |
227 | ||
60f067b4 | 228 | LIST_FOREACH(links, link, ctx->links) { |
6e866b33 MB |
229 | const char *address = NULL, *id_path = NULL, *parent_driver = NULL, *id_net_driver = NULL, *devtype = NULL, *sysname = NULL; |
230 | sd_device *parent; | |
f47781d8 | 231 | |
6e866b33 MB |
232 | (void) sd_device_get_sysattr_value(device, "address", &address); |
233 | (void) sd_device_get_property_value(device, "ID_PATH", &id_path); | |
234 | if (sd_device_get_parent(device, &parent) >= 0) | |
235 | (void) sd_device_get_driver(parent, &parent_driver); | |
236 | (void) sd_device_get_property_value(device, "ID_NET_DRIVER", &id_net_driver); | |
237 | (void) sd_device_get_devtype(device, &devtype); | |
238 | (void) sd_device_get_sysname(device, &sysname); | |
60f067b4 JS |
239 | |
240 | if (net_match_config(link->match_mac, link->match_path, link->match_driver, | |
f47781d8 | 241 | link->match_type, link->match_name, link->match_host, |
1d42b86d MB |
242 | link->match_virt, link->match_kernel_cmdline, |
243 | link->match_kernel_version, link->match_arch, | |
6e866b33 MB |
244 | address ? ether_aton(address) : NULL, |
245 | id_path, | |
246 | parent_driver, | |
247 | id_net_driver, | |
248 | devtype, | |
249 | sysname)) { | |
f47781d8 MP |
250 | if (link->match_name) { |
251 | unsigned char name_assign_type = NET_NAME_UNKNOWN; | |
6e866b33 | 252 | const char *attr_value; |
f47781d8 | 253 | |
6e866b33 | 254 | if (sd_device_get_sysattr_value(device, "name_assign_type", &attr_value) >= 0) |
e3bff60a | 255 | (void) safe_atou8(attr_value, &name_assign_type); |
f47781d8 MP |
256 | |
257 | if (name_assign_type == NET_NAME_ENUM) { | |
258 | log_warning("Config file %s applies to device based on potentially unpredictable interface name '%s'", | |
6e866b33 | 259 | link->filename, sysname); |
f47781d8 MP |
260 | *ret = link; |
261 | ||
262 | return 0; | |
263 | } else if (name_assign_type == NET_NAME_RENAMED) { | |
264 | log_warning("Config file %s matches device based on renamed interface name '%s', ignoring", | |
6e866b33 | 265 | link->filename, sysname); |
f47781d8 MP |
266 | |
267 | continue; | |
268 | } | |
269 | } | |
270 | ||
60f067b4 | 271 | log_debug("Config file %s applies to device %s", |
6e866b33 | 272 | link->filename, sysname); |
f47781d8 | 273 | |
60f067b4 | 274 | *ret = link; |
f47781d8 | 275 | |
60f067b4 JS |
276 | return 0; |
277 | } | |
278 | } | |
279 | ||
280 | *ret = NULL; | |
281 | ||
282 | return -ENOENT; | |
283 | } | |
284 | ||
6e866b33 | 285 | static bool mac_is_random(sd_device *device) { |
60f067b4 JS |
286 | const char *s; |
287 | unsigned type; | |
288 | int r; | |
289 | ||
5eef597e | 290 | /* if we can't get the assign type, assume it is not random */ |
6e866b33 | 291 | if (sd_device_get_sysattr_value(device, "addr_assign_type", &s) < 0) |
5eef597e MP |
292 | return false; |
293 | ||
60f067b4 JS |
294 | r = safe_atou(s, &type); |
295 | if (r < 0) | |
296 | return false; | |
297 | ||
5eef597e MP |
298 | return type == NET_ADDR_RANDOM; |
299 | } | |
300 | ||
6e866b33 | 301 | static bool should_rename(sd_device *device, bool respect_predictable) { |
5eef597e MP |
302 | const char *s; |
303 | unsigned type; | |
304 | int r; | |
305 | ||
306 | /* if we can't get the assgin type, assume we should rename */ | |
6e866b33 | 307 | if (sd_device_get_sysattr_value(device, "name_assign_type", &s) < 0) |
5eef597e MP |
308 | return true; |
309 | ||
310 | r = safe_atou(s, &type); | |
311 | if (r < 0) | |
312 | return true; | |
313 | ||
314 | switch (type) { | |
5eef597e MP |
315 | case NET_NAME_PREDICTABLE: |
316 | /* the kernel claims to have given a predictable name */ | |
317 | if (respect_predictable) | |
318 | return false; | |
52ad194e | 319 | _fallthrough_; |
5eef597e MP |
320 | default: |
321 | /* the name is known to be bad, or of an unknown type */ | |
322 | return true; | |
323 | } | |
60f067b4 JS |
324 | } |
325 | ||
6e866b33 | 326 | static int get_mac(sd_device *device, bool want_random, |
5eef597e | 327 | struct ether_addr *mac) { |
60f067b4 JS |
328 | int r; |
329 | ||
330 | if (want_random) | |
331 | random_bytes(mac->ether_addr_octet, ETH_ALEN); | |
332 | else { | |
db2df898 | 333 | uint64_t result; |
60f067b4 | 334 | |
db2df898 | 335 | r = net_get_unique_predictable_data(device, &result); |
60f067b4 JS |
336 | if (r < 0) |
337 | return r; | |
338 | ||
339 | assert_cc(ETH_ALEN <= sizeof(result)); | |
db2df898 | 340 | memcpy(mac->ether_addr_octet, &result, ETH_ALEN); |
60f067b4 JS |
341 | } |
342 | ||
343 | /* see eth_random_addr in the kernel */ | |
5eef597e MP |
344 | mac->ether_addr_octet[0] &= 0xfe; /* clear multicast bit */ |
345 | mac->ether_addr_octet[0] |= 0x02; /* set local assignment bit (IEEE802) */ | |
60f067b4 JS |
346 | |
347 | return 0; | |
348 | } | |
349 | ||
5eef597e | 350 | int link_config_apply(link_config_ctx *ctx, link_config *config, |
6e866b33 | 351 | sd_device *device, const char **name) { |
2897b343 | 352 | bool respect_predictable = false; |
60f067b4 JS |
353 | struct ether_addr generated_mac; |
354 | struct ether_addr *mac = NULL; | |
2897b343 MP |
355 | const char *new_name = NULL; |
356 | const char *old_name; | |
357 | unsigned speed; | |
60f067b4 JS |
358 | int r, ifindex; |
359 | ||
360 | assert(ctx); | |
361 | assert(config); | |
362 | assert(device); | |
363 | assert(name); | |
364 | ||
6e866b33 MB |
365 | r = sd_device_get_sysname(device, &old_name); |
366 | if (r < 0) | |
367 | return r; | |
60f067b4 | 368 | |
81c58355 | 369 | r = ethtool_set_glinksettings(&ctx->ethtool_fd, old_name, config); |
2897b343 MP |
370 | if (r < 0) { |
371 | ||
81c58355 | 372 | if (config->port != _NET_DEV_PORT_INVALID) |
6e866b33 | 373 | log_warning_errno(r, "Could not set port (%s) of %s: %m", port_to_string(config->port), old_name); |
81c58355 | 374 | |
6e866b33 MB |
375 | if (!eqzero(config->advertise)) |
376 | log_warning_errno(r, "Could not set advertise mode: %m"); /* TODO: include modes in the log message. */ | |
2897b343 | 377 | |
6e866b33 MB |
378 | if (config->speed) { |
379 | speed = DIV_ROUND_UP(config->speed, 1000000); | |
380 | if (r == -EOPNOTSUPP) { | |
381 | r = ethtool_set_speed(&ctx->ethtool_fd, old_name, speed, config->duplex); | |
382 | if (r < 0) | |
383 | log_warning_errno(r, "Could not set speed of %s to %u Mbps: %m", old_name, speed); | |
384 | } | |
385 | } | |
386 | ||
387 | if (config->duplex !=_DUP_INVALID) | |
388 | log_warning_errno(r, "Could not set duplex of %s to (%s): %m", old_name, duplex_to_string(config->duplex)); | |
2897b343 | 389 | } |
60f067b4 | 390 | |
5eef597e | 391 | r = ethtool_set_wol(&ctx->ethtool_fd, old_name, config->wol); |
60f067b4 | 392 | if (r < 0) |
f47781d8 MP |
393 | log_warning_errno(r, "Could not set WakeOnLan of %s to %s: %m", |
394 | old_name, wol_to_string(config->wol)); | |
60f067b4 | 395 | |
8a584da2 MP |
396 | r = ethtool_set_features(&ctx->ethtool_fd, old_name, config->features); |
397 | if (r < 0) | |
398 | log_warning_errno(r, "Could not set offload features of %s: %m", old_name); | |
399 | ||
b012e921 MB |
400 | if (config->channels.rx_count_set || config->channels.tx_count_set || config->channels.other_count_set || config->channels.combined_count_set) { |
401 | r = ethtool_set_channels(&ctx->ethtool_fd, old_name, &config->channels); | |
402 | if (r < 0) | |
403 | log_warning_errno(r, "Could not set channels of %s: %m", old_name); | |
404 | } | |
405 | ||
6e866b33 MB |
406 | r = sd_device_get_ifindex(device, &ifindex); |
407 | if (r < 0) | |
408 | return log_device_warning_errno(device, r, "Could not find ifindex: %m"); | |
60f067b4 JS |
409 | |
410 | if (ctx->enable_name_policy && config->name_policy) { | |
411 | NamePolicy *policy; | |
412 | ||
5eef597e MP |
413 | for (policy = config->name_policy; |
414 | !new_name && *policy != _NAMEPOLICY_INVALID; policy++) { | |
60f067b4 | 415 | switch (*policy) { |
5eef597e MP |
416 | case NAMEPOLICY_KERNEL: |
417 | respect_predictable = true; | |
418 | break; | |
60f067b4 | 419 | case NAMEPOLICY_DATABASE: |
6e866b33 | 420 | (void) sd_device_get_property_value(device, "ID_NET_NAME_FROM_DATABASE", &new_name); |
60f067b4 JS |
421 | break; |
422 | case NAMEPOLICY_ONBOARD: | |
6e866b33 | 423 | (void) sd_device_get_property_value(device, "ID_NET_NAME_ONBOARD", &new_name); |
60f067b4 JS |
424 | break; |
425 | case NAMEPOLICY_SLOT: | |
6e866b33 | 426 | (void) sd_device_get_property_value(device, "ID_NET_NAME_SLOT", &new_name); |
60f067b4 JS |
427 | break; |
428 | case NAMEPOLICY_PATH: | |
6e866b33 | 429 | (void) sd_device_get_property_value(device, "ID_NET_NAME_PATH", &new_name); |
60f067b4 JS |
430 | break; |
431 | case NAMEPOLICY_MAC: | |
6e866b33 | 432 | (void) sd_device_get_property_value(device, "ID_NET_NAME_MAC", &new_name); |
60f067b4 JS |
433 | break; |
434 | default: | |
435 | break; | |
436 | } | |
437 | } | |
438 | } | |
439 | ||
6e866b33 MB |
440 | if (!new_name && should_rename(device, respect_predictable)) |
441 | new_name = config->name; | |
60f067b4 JS |
442 | |
443 | switch (config->mac_policy) { | |
444 | case MACPOLICY_PERSISTENT: | |
445 | if (mac_is_random(device)) { | |
446 | r = get_mac(device, false, &generated_mac); | |
e735f4d4 MP |
447 | if (r == -ENOENT) { |
448 | log_warning_errno(r, "Could not generate persistent MAC address for %s: %m", old_name); | |
5eef597e | 449 | break; |
e735f4d4 | 450 | } else if (r < 0) |
60f067b4 JS |
451 | return r; |
452 | mac = &generated_mac; | |
453 | } | |
454 | break; | |
455 | case MACPOLICY_RANDOM: | |
456 | if (!mac_is_random(device)) { | |
457 | r = get_mac(device, true, &generated_mac); | |
e735f4d4 MP |
458 | if (r == -ENOENT) { |
459 | log_warning_errno(r, "Could not generate random MAC address for %s: %m", old_name); | |
5eef597e | 460 | break; |
e735f4d4 | 461 | } else if (r < 0) |
60f067b4 JS |
462 | return r; |
463 | mac = &generated_mac; | |
464 | } | |
465 | break; | |
6300502b | 466 | case MACPOLICY_NONE: |
60f067b4 JS |
467 | default: |
468 | mac = config->mac; | |
469 | } | |
470 | ||
e3bff60a | 471 | r = rtnl_set_link_properties(&ctx->rtnl, ifindex, config->alias, mac, config->mtu); |
f47781d8 | 472 | if (r < 0) |
b012e921 | 473 | return log_warning_errno(r, "Could not set Alias=, MACAddress= or MTU= on %s: %m", old_name); |
60f067b4 | 474 | |
5eef597e MP |
475 | *name = new_name; |
476 | ||
60f067b4 JS |
477 | return 0; |
478 | } | |
479 | ||
6e866b33 | 480 | int link_get_driver(link_config_ctx *ctx, sd_device *device, char **ret) { |
60f067b4 | 481 | const char *name; |
e3bff60a | 482 | char *driver = NULL; |
60f067b4 JS |
483 | int r; |
484 | ||
6e866b33 MB |
485 | r = sd_device_get_sysname(device, &name); |
486 | if (r < 0) | |
487 | return r; | |
60f067b4 | 488 | |
5eef597e | 489 | r = ethtool_get_driver(&ctx->ethtool_fd, name, &driver); |
60f067b4 JS |
490 | if (r < 0) |
491 | return r; | |
492 | ||
493 | *ret = driver; | |
494 | return 0; | |
495 | } | |
496 | ||
497 | static const char* const mac_policy_table[_MACPOLICY_MAX] = { | |
498 | [MACPOLICY_PERSISTENT] = "persistent", | |
6300502b MP |
499 | [MACPOLICY_RANDOM] = "random", |
500 | [MACPOLICY_NONE] = "none" | |
60f067b4 JS |
501 | }; |
502 | ||
503 | DEFINE_STRING_TABLE_LOOKUP(mac_policy, MACPolicy); | |
5eef597e MP |
504 | DEFINE_CONFIG_PARSE_ENUM(config_parse_mac_policy, mac_policy, MACPolicy, |
505 | "Failed to parse MAC address policy"); | |
60f067b4 JS |
506 | |
507 | static const char* const name_policy_table[_NAMEPOLICY_MAX] = { | |
5eef597e | 508 | [NAMEPOLICY_KERNEL] = "kernel", |
60f067b4 JS |
509 | [NAMEPOLICY_DATABASE] = "database", |
510 | [NAMEPOLICY_ONBOARD] = "onboard", | |
511 | [NAMEPOLICY_SLOT] = "slot", | |
512 | [NAMEPOLICY_PATH] = "path", | |
513 | [NAMEPOLICY_MAC] = "mac" | |
514 | }; | |
515 | ||
516 | DEFINE_STRING_TABLE_LOOKUP(name_policy, NamePolicy); | |
5eef597e MP |
517 | DEFINE_CONFIG_PARSE_ENUMV(config_parse_name_policy, name_policy, NamePolicy, |
518 | _NAMEPOLICY_INVALID, | |
519 | "Failed to parse interface name policy"); |