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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
8e274523 | 2 | |
c6c18be3 | 3 | #include <fcntl.h> |
e41969e3 | 4 | #include <fnmatch.h> |
8c6db833 | 5 | |
b5efdb8a | 6 | #include "alloc-util.h" |
18c528e9 | 7 | #include "blockdev-util.h" |
906c06f6 | 8 | #include "bpf-firewall.h" |
45c2e068 | 9 | #include "btrfs-util.h" |
084c7007 | 10 | #include "bpf-devices.h" |
6592b975 | 11 | #include "bus-error.h" |
03a7b521 | 12 | #include "cgroup-util.h" |
3ffd4af2 LP |
13 | #include "cgroup.h" |
14 | #include "fd-util.h" | |
0d39fa9c | 15 | #include "fileio.h" |
77601719 | 16 | #include "fs-util.h" |
6bedfcbb | 17 | #include "parse-util.h" |
9eb977db | 18 | #include "path-util.h" |
03a7b521 | 19 | #include "process-util.h" |
c36a69f4 | 20 | #include "procfs-util.h" |
9444b1f2 | 21 | #include "special.h" |
74c48bf5 | 22 | #include "stat-util.h" |
906c06f6 | 23 | #include "stdio-util.h" |
8b43440b | 24 | #include "string-table.h" |
07630cea | 25 | #include "string-util.h" |
cc6271f1 | 26 | #include "virt.h" |
8e274523 | 27 | |
9a054909 LP |
28 | #define CGROUP_CPU_QUOTA_PERIOD_USEC ((usec_t) 100 * USEC_PER_MSEC) |
29 | ||
39b9fefb LP |
30 | /* Returns the log level to use when cgroup attribute writes fail. When an attribute is missing or we have access |
31 | * problems we downgrade to LOG_DEBUG. This is supposed to be nice to container managers and kernels which want to mask | |
32 | * out specific attributes from us. */ | |
33 | #define LOG_LEVEL_CGROUP_WRITE(r) (IN_SET(abs(r), ENOENT, EROFS, EACCES, EPERM) ? LOG_DEBUG : LOG_WARNING) | |
34 | ||
611c4f8a | 35 | bool manager_owns_host_root_cgroup(Manager *m) { |
cc6271f1 LP |
36 | assert(m); |
37 | ||
38 | /* Returns true if we are managing the root cgroup. Note that it isn't sufficient to just check whether the | |
39 | * group root path equals "/" since that will also be the case if CLONE_NEWCGROUP is in the mix. Since there's | |
40 | * appears to be no nice way to detect whether we are in a CLONE_NEWCGROUP namespace we instead just check if | |
41 | * we run in any kind of container virtualization. */ | |
42 | ||
28cfdc5a LP |
43 | if (MANAGER_IS_USER(m)) |
44 | return false; | |
45 | ||
cc6271f1 LP |
46 | if (detect_container() > 0) |
47 | return false; | |
48 | ||
57ea45e1 | 49 | return empty_or_root(m->cgroup_root); |
cc6271f1 LP |
50 | } |
51 | ||
611c4f8a | 52 | bool unit_has_host_root_cgroup(Unit *u) { |
f3725e64 LP |
53 | assert(u); |
54 | ||
cc6271f1 LP |
55 | /* Returns whether this unit manages the root cgroup. This will return true if this unit is the root slice and |
56 | * the manager manages the root cgroup. */ | |
f3725e64 | 57 | |
611c4f8a | 58 | if (!manager_owns_host_root_cgroup(u->manager)) |
f3725e64 LP |
59 | return false; |
60 | ||
cc6271f1 | 61 | return unit_has_name(u, SPECIAL_ROOT_SLICE); |
f3725e64 LP |
62 | } |
63 | ||
293d32df LP |
64 | static int set_attribute_and_warn(Unit *u, const char *controller, const char *attribute, const char *value) { |
65 | int r; | |
66 | ||
67 | r = cg_set_attribute(controller, u->cgroup_path, attribute, value); | |
68 | if (r < 0) | |
69 | log_unit_full(u, LOG_LEVEL_CGROUP_WRITE(r), r, "Failed to set '%s' attribute on '%s' to '%.*s': %m", | |
70 | strna(attribute), isempty(u->cgroup_path) ? "/" : u->cgroup_path, (int) strcspn(value, NEWLINE), value); | |
71 | ||
72 | return r; | |
73 | } | |
74 | ||
2b40998d | 75 | static void cgroup_compat_warn(void) { |
128fadc9 TH |
76 | static bool cgroup_compat_warned = false; |
77 | ||
78 | if (cgroup_compat_warned) | |
79 | return; | |
80 | ||
cc6271f1 LP |
81 | log_warning("cgroup compatibility translation between legacy and unified hierarchy settings activated. " |
82 | "See cgroup-compat debug messages for details."); | |
83 | ||
128fadc9 TH |
84 | cgroup_compat_warned = true; |
85 | } | |
86 | ||
87 | #define log_cgroup_compat(unit, fmt, ...) do { \ | |
88 | cgroup_compat_warn(); \ | |
89 | log_unit_debug(unit, "cgroup-compat: " fmt, ##__VA_ARGS__); \ | |
2b40998d | 90 | } while (false) |
128fadc9 | 91 | |
4ad49000 LP |
92 | void cgroup_context_init(CGroupContext *c) { |
93 | assert(c); | |
94 | ||
de8a711a | 95 | /* Initialize everything to the kernel defaults. */ |
4ad49000 | 96 | |
de8a711a LP |
97 | *c = (CGroupContext) { |
98 | .cpu_weight = CGROUP_WEIGHT_INVALID, | |
99 | .startup_cpu_weight = CGROUP_WEIGHT_INVALID, | |
100 | .cpu_quota_per_sec_usec = USEC_INFINITY, | |
66ebf6c0 | 101 | |
de8a711a LP |
102 | .cpu_shares = CGROUP_CPU_SHARES_INVALID, |
103 | .startup_cpu_shares = CGROUP_CPU_SHARES_INVALID, | |
d53d9474 | 104 | |
de8a711a LP |
105 | .memory_high = CGROUP_LIMIT_MAX, |
106 | .memory_max = CGROUP_LIMIT_MAX, | |
107 | .memory_swap_max = CGROUP_LIMIT_MAX, | |
da4d897e | 108 | |
de8a711a | 109 | .memory_limit = CGROUP_LIMIT_MAX, |
b2f8b02e | 110 | |
de8a711a LP |
111 | .io_weight = CGROUP_WEIGHT_INVALID, |
112 | .startup_io_weight = CGROUP_WEIGHT_INVALID, | |
13c31542 | 113 | |
de8a711a LP |
114 | .blockio_weight = CGROUP_BLKIO_WEIGHT_INVALID, |
115 | .startup_blockio_weight = CGROUP_BLKIO_WEIGHT_INVALID, | |
d53d9474 | 116 | |
de8a711a LP |
117 | .tasks_max = CGROUP_LIMIT_MAX, |
118 | }; | |
4ad49000 | 119 | } |
8e274523 | 120 | |
4ad49000 LP |
121 | void cgroup_context_free_device_allow(CGroupContext *c, CGroupDeviceAllow *a) { |
122 | assert(c); | |
123 | assert(a); | |
124 | ||
71fda00f | 125 | LIST_REMOVE(device_allow, c->device_allow, a); |
4ad49000 LP |
126 | free(a->path); |
127 | free(a); | |
128 | } | |
129 | ||
13c31542 TH |
130 | void cgroup_context_free_io_device_weight(CGroupContext *c, CGroupIODeviceWeight *w) { |
131 | assert(c); | |
132 | assert(w); | |
133 | ||
134 | LIST_REMOVE(device_weights, c->io_device_weights, w); | |
135 | free(w->path); | |
136 | free(w); | |
137 | } | |
138 | ||
6ae4283c TH |
139 | void cgroup_context_free_io_device_latency(CGroupContext *c, CGroupIODeviceLatency *l) { |
140 | assert(c); | |
141 | assert(l); | |
142 | ||
143 | LIST_REMOVE(device_latencies, c->io_device_latencies, l); | |
144 | free(l->path); | |
145 | free(l); | |
146 | } | |
147 | ||
13c31542 TH |
148 | void cgroup_context_free_io_device_limit(CGroupContext *c, CGroupIODeviceLimit *l) { |
149 | assert(c); | |
150 | assert(l); | |
151 | ||
152 | LIST_REMOVE(device_limits, c->io_device_limits, l); | |
153 | free(l->path); | |
154 | free(l); | |
155 | } | |
156 | ||
4ad49000 LP |
157 | void cgroup_context_free_blockio_device_weight(CGroupContext *c, CGroupBlockIODeviceWeight *w) { |
158 | assert(c); | |
159 | assert(w); | |
160 | ||
71fda00f | 161 | LIST_REMOVE(device_weights, c->blockio_device_weights, w); |
4ad49000 LP |
162 | free(w->path); |
163 | free(w); | |
164 | } | |
165 | ||
166 | void cgroup_context_free_blockio_device_bandwidth(CGroupContext *c, CGroupBlockIODeviceBandwidth *b) { | |
167 | assert(c); | |
8e274523 | 168 | assert(b); |
8e274523 | 169 | |
71fda00f | 170 | LIST_REMOVE(device_bandwidths, c->blockio_device_bandwidths, b); |
4ad49000 LP |
171 | free(b->path); |
172 | free(b); | |
173 | } | |
174 | ||
175 | void cgroup_context_done(CGroupContext *c) { | |
176 | assert(c); | |
177 | ||
13c31542 TH |
178 | while (c->io_device_weights) |
179 | cgroup_context_free_io_device_weight(c, c->io_device_weights); | |
180 | ||
6ae4283c TH |
181 | while (c->io_device_latencies) |
182 | cgroup_context_free_io_device_latency(c, c->io_device_latencies); | |
183 | ||
13c31542 TH |
184 | while (c->io_device_limits) |
185 | cgroup_context_free_io_device_limit(c, c->io_device_limits); | |
186 | ||
4ad49000 LP |
187 | while (c->blockio_device_weights) |
188 | cgroup_context_free_blockio_device_weight(c, c->blockio_device_weights); | |
189 | ||
190 | while (c->blockio_device_bandwidths) | |
191 | cgroup_context_free_blockio_device_bandwidth(c, c->blockio_device_bandwidths); | |
192 | ||
193 | while (c->device_allow) | |
194 | cgroup_context_free_device_allow(c, c->device_allow); | |
6a48d82f DM |
195 | |
196 | c->ip_address_allow = ip_address_access_free_all(c->ip_address_allow); | |
197 | c->ip_address_deny = ip_address_access_free_all(c->ip_address_deny); | |
4ad49000 LP |
198 | } |
199 | ||
200 | void cgroup_context_dump(CGroupContext *c, FILE* f, const char *prefix) { | |
13c31542 TH |
201 | CGroupIODeviceLimit *il; |
202 | CGroupIODeviceWeight *iw; | |
6ae4283c | 203 | CGroupIODeviceLatency *l; |
4ad49000 LP |
204 | CGroupBlockIODeviceBandwidth *b; |
205 | CGroupBlockIODeviceWeight *w; | |
206 | CGroupDeviceAllow *a; | |
c21c9906 | 207 | IPAddressAccessItem *iaai; |
9a054909 | 208 | char u[FORMAT_TIMESPAN_MAX]; |
4ad49000 LP |
209 | |
210 | assert(c); | |
211 | assert(f); | |
212 | ||
213 | prefix = strempty(prefix); | |
214 | ||
215 | fprintf(f, | |
216 | "%sCPUAccounting=%s\n" | |
13c31542 | 217 | "%sIOAccounting=%s\n" |
4ad49000 LP |
218 | "%sBlockIOAccounting=%s\n" |
219 | "%sMemoryAccounting=%s\n" | |
d53d9474 | 220 | "%sTasksAccounting=%s\n" |
c21c9906 | 221 | "%sIPAccounting=%s\n" |
66ebf6c0 TH |
222 | "%sCPUWeight=%" PRIu64 "\n" |
223 | "%sStartupCPUWeight=%" PRIu64 "\n" | |
d53d9474 LP |
224 | "%sCPUShares=%" PRIu64 "\n" |
225 | "%sStartupCPUShares=%" PRIu64 "\n" | |
b2f8b02e | 226 | "%sCPUQuotaPerSecSec=%s\n" |
13c31542 TH |
227 | "%sIOWeight=%" PRIu64 "\n" |
228 | "%sStartupIOWeight=%" PRIu64 "\n" | |
d53d9474 LP |
229 | "%sBlockIOWeight=%" PRIu64 "\n" |
230 | "%sStartupBlockIOWeight=%" PRIu64 "\n" | |
48422635 | 231 | "%sMemoryMin=%" PRIu64 "\n" |
da4d897e TH |
232 | "%sMemoryLow=%" PRIu64 "\n" |
233 | "%sMemoryHigh=%" PRIu64 "\n" | |
234 | "%sMemoryMax=%" PRIu64 "\n" | |
96e131ea | 235 | "%sMemorySwapMax=%" PRIu64 "\n" |
4ad49000 | 236 | "%sMemoryLimit=%" PRIu64 "\n" |
03a7b521 | 237 | "%sTasksMax=%" PRIu64 "\n" |
a931ad47 LP |
238 | "%sDevicePolicy=%s\n" |
239 | "%sDelegate=%s\n", | |
4ad49000 | 240 | prefix, yes_no(c->cpu_accounting), |
13c31542 | 241 | prefix, yes_no(c->io_accounting), |
4ad49000 LP |
242 | prefix, yes_no(c->blockio_accounting), |
243 | prefix, yes_no(c->memory_accounting), | |
d53d9474 | 244 | prefix, yes_no(c->tasks_accounting), |
c21c9906 | 245 | prefix, yes_no(c->ip_accounting), |
66ebf6c0 TH |
246 | prefix, c->cpu_weight, |
247 | prefix, c->startup_cpu_weight, | |
4ad49000 | 248 | prefix, c->cpu_shares, |
95ae05c0 | 249 | prefix, c->startup_cpu_shares, |
b1d6dcf5 | 250 | prefix, format_timespan(u, sizeof(u), c->cpu_quota_per_sec_usec, 1), |
13c31542 TH |
251 | prefix, c->io_weight, |
252 | prefix, c->startup_io_weight, | |
4ad49000 | 253 | prefix, c->blockio_weight, |
95ae05c0 | 254 | prefix, c->startup_blockio_weight, |
48422635 | 255 | prefix, c->memory_min, |
da4d897e TH |
256 | prefix, c->memory_low, |
257 | prefix, c->memory_high, | |
258 | prefix, c->memory_max, | |
96e131ea | 259 | prefix, c->memory_swap_max, |
4ad49000 | 260 | prefix, c->memory_limit, |
03a7b521 | 261 | prefix, c->tasks_max, |
a931ad47 LP |
262 | prefix, cgroup_device_policy_to_string(c->device_policy), |
263 | prefix, yes_no(c->delegate)); | |
4ad49000 | 264 | |
02638280 LP |
265 | if (c->delegate) { |
266 | _cleanup_free_ char *t = NULL; | |
267 | ||
268 | (void) cg_mask_to_string(c->delegate_controllers, &t); | |
269 | ||
47a78d41 | 270 | fprintf(f, "%sDelegateControllers=%s\n", |
02638280 LP |
271 | prefix, |
272 | strempty(t)); | |
273 | } | |
274 | ||
4ad49000 LP |
275 | LIST_FOREACH(device_allow, a, c->device_allow) |
276 | fprintf(f, | |
277 | "%sDeviceAllow=%s %s%s%s\n", | |
278 | prefix, | |
279 | a->path, | |
280 | a->r ? "r" : "", a->w ? "w" : "", a->m ? "m" : ""); | |
281 | ||
13c31542 TH |
282 | LIST_FOREACH(device_weights, iw, c->io_device_weights) |
283 | fprintf(f, | |
6ae4283c | 284 | "%sIODeviceWeight=%s %" PRIu64 "\n", |
13c31542 TH |
285 | prefix, |
286 | iw->path, | |
287 | iw->weight); | |
288 | ||
6ae4283c TH |
289 | LIST_FOREACH(device_latencies, l, c->io_device_latencies) |
290 | fprintf(f, | |
291 | "%sIODeviceLatencyTargetSec=%s %s\n", | |
292 | prefix, | |
293 | l->path, | |
294 | format_timespan(u, sizeof(u), l->target_usec, 1)); | |
295 | ||
13c31542 TH |
296 | LIST_FOREACH(device_limits, il, c->io_device_limits) { |
297 | char buf[FORMAT_BYTES_MAX]; | |
9be57249 TH |
298 | CGroupIOLimitType type; |
299 | ||
300 | for (type = 0; type < _CGROUP_IO_LIMIT_TYPE_MAX; type++) | |
301 | if (il->limits[type] != cgroup_io_limit_defaults[type]) | |
302 | fprintf(f, | |
303 | "%s%s=%s %s\n", | |
304 | prefix, | |
305 | cgroup_io_limit_type_to_string(type), | |
306 | il->path, | |
307 | format_bytes(buf, sizeof(buf), il->limits[type])); | |
13c31542 TH |
308 | } |
309 | ||
4ad49000 LP |
310 | LIST_FOREACH(device_weights, w, c->blockio_device_weights) |
311 | fprintf(f, | |
d53d9474 | 312 | "%sBlockIODeviceWeight=%s %" PRIu64, |
4ad49000 LP |
313 | prefix, |
314 | w->path, | |
315 | w->weight); | |
316 | ||
317 | LIST_FOREACH(device_bandwidths, b, c->blockio_device_bandwidths) { | |
318 | char buf[FORMAT_BYTES_MAX]; | |
319 | ||
979d0311 TH |
320 | if (b->rbps != CGROUP_LIMIT_MAX) |
321 | fprintf(f, | |
322 | "%sBlockIOReadBandwidth=%s %s\n", | |
323 | prefix, | |
324 | b->path, | |
325 | format_bytes(buf, sizeof(buf), b->rbps)); | |
326 | if (b->wbps != CGROUP_LIMIT_MAX) | |
327 | fprintf(f, | |
328 | "%sBlockIOWriteBandwidth=%s %s\n", | |
329 | prefix, | |
330 | b->path, | |
331 | format_bytes(buf, sizeof(buf), b->wbps)); | |
4ad49000 | 332 | } |
c21c9906 LP |
333 | |
334 | LIST_FOREACH(items, iaai, c->ip_address_allow) { | |
335 | _cleanup_free_ char *k = NULL; | |
336 | ||
337 | (void) in_addr_to_string(iaai->family, &iaai->address, &k); | |
338 | fprintf(f, "%sIPAddressAllow=%s/%u\n", prefix, strnull(k), iaai->prefixlen); | |
339 | } | |
340 | ||
341 | LIST_FOREACH(items, iaai, c->ip_address_deny) { | |
342 | _cleanup_free_ char *k = NULL; | |
343 | ||
344 | (void) in_addr_to_string(iaai->family, &iaai->address, &k); | |
345 | fprintf(f, "%sIPAddressDeny=%s/%u\n", prefix, strnull(k), iaai->prefixlen); | |
346 | } | |
4ad49000 LP |
347 | } |
348 | ||
fd870bac YW |
349 | int cgroup_add_device_allow(CGroupContext *c, const char *dev, const char *mode) { |
350 | _cleanup_free_ CGroupDeviceAllow *a = NULL; | |
351 | _cleanup_free_ char *d = NULL; | |
352 | ||
353 | assert(c); | |
354 | assert(dev); | |
355 | assert(isempty(mode) || in_charset(mode, "rwm")); | |
356 | ||
357 | a = new(CGroupDeviceAllow, 1); | |
358 | if (!a) | |
359 | return -ENOMEM; | |
360 | ||
361 | d = strdup(dev); | |
362 | if (!d) | |
363 | return -ENOMEM; | |
364 | ||
365 | *a = (CGroupDeviceAllow) { | |
366 | .path = TAKE_PTR(d), | |
490c5a37 LP |
367 | .r = isempty(mode) || strchr(mode, 'r'), |
368 | .w = isempty(mode) || strchr(mode, 'w'), | |
369 | .m = isempty(mode) || strchr(mode, 'm'), | |
fd870bac YW |
370 | }; |
371 | ||
372 | LIST_PREPEND(device_allow, c->device_allow, a); | |
373 | TAKE_PTR(a); | |
374 | ||
375 | return 0; | |
376 | } | |
377 | ||
45c2e068 | 378 | static int lookup_block_device(const char *p, dev_t *ret) { |
d5aecba6 | 379 | struct stat st = {}; |
45c2e068 | 380 | int r; |
4ad49000 LP |
381 | |
382 | assert(p); | |
45c2e068 | 383 | assert(ret); |
4ad49000 | 384 | |
d5aecba6 LP |
385 | r = device_path_parse_major_minor(p, &st.st_mode, &st.st_rdev); |
386 | if (r == -ENODEV) { /* not a parsable device node, need to go to disk */ | |
387 | if (stat(p, &st) < 0) | |
388 | return log_warning_errno(errno, "Couldn't stat device '%s': %m", p); | |
389 | } else if (r < 0) | |
390 | return log_warning_errno(r, "Failed to parse major/minor from path '%s': %m", p); | |
391 | ||
392 | if (S_ISCHR(st.st_mode)) { | |
393 | log_warning("Device node '%s' is a character device, but block device needed.", p); | |
394 | return -ENOTBLK; | |
395 | } else if (S_ISBLK(st.st_mode)) | |
45c2e068 LP |
396 | *ret = st.st_rdev; |
397 | else if (major(st.st_dev) != 0) | |
398 | *ret = st.st_dev; /* If this is not a device node then use the block device this file is stored on */ | |
399 | else { | |
400 | /* If this is btrfs, getting the backing block device is a bit harder */ | |
401 | r = btrfs_get_block_device(p, ret); | |
402 | if (r < 0 && r != -ENOTTY) | |
403 | return log_warning_errno(r, "Failed to determine block device backing btrfs file system '%s': %m", p); | |
404 | if (r == -ENOTTY) { | |
405 | log_warning("'%s' is not a block device node, and file system block device cannot be determined or is not local.", p); | |
406 | return -ENODEV; | |
407 | } | |
4ad49000 | 408 | } |
8e274523 | 409 | |
45c2e068 LP |
410 | /* If this is a LUKS device, try to get the originating block device */ |
411 | (void) block_get_originating(*ret, ret); | |
412 | ||
413 | /* If this is a partition, try to get the originating block device */ | |
414 | (void) block_get_whole_disk(*ret, ret); | |
8e274523 | 415 | return 0; |
8e274523 LP |
416 | } |
417 | ||
084c7007 | 418 | static int whitelist_device(BPFProgram *prog, const char *path, const char *node, const char *acc) { |
846b3bd6 | 419 | struct stat st = {}; |
8c6db833 | 420 | int r; |
8e274523 | 421 | |
4ad49000 LP |
422 | assert(path); |
423 | assert(acc); | |
8e274523 | 424 | |
74c48bf5 LP |
425 | /* Some special handling for /dev/block/%u:%u, /dev/char/%u:%u, /run/systemd/inaccessible/chr and |
426 | * /run/systemd/inaccessible/blk paths. Instead of stat()ing these we parse out the major/minor directly. This | |
427 | * means clients can use these path without the device node actually around */ | |
846b3bd6 | 428 | r = device_path_parse_major_minor(node, &st.st_mode, &st.st_rdev); |
74c48bf5 LP |
429 | if (r < 0) { |
430 | if (r != -ENODEV) | |
431 | return log_warning_errno(r, "Couldn't parse major/minor from device path '%s': %m", node); | |
b200489b | 432 | |
74c48bf5 LP |
433 | if (stat(node, &st) < 0) |
434 | return log_warning_errno(errno, "Couldn't stat device %s: %m", node); | |
e7330dfe | 435 | |
74c48bf5 LP |
436 | if (!S_ISCHR(st.st_mode) && !S_ISBLK(st.st_mode)) { |
437 | log_warning("%s is not a device.", node); | |
438 | return -ENODEV; | |
439 | } | |
4ad49000 LP |
440 | } |
441 | ||
084c7007 RG |
442 | if (cg_all_unified() > 0) { |
443 | if (!prog) | |
444 | return 0; | |
4ad49000 | 445 | |
b9839ac9 LP |
446 | return cgroup_bpf_whitelist_device(prog, S_ISCHR(st.st_mode) ? BPF_DEVCG_DEV_CHAR : BPF_DEVCG_DEV_BLOCK, |
447 | major(st.st_rdev), minor(st.st_rdev), acc); | |
448 | ||
084c7007 RG |
449 | } else { |
450 | char buf[2+DECIMAL_STR_MAX(dev_t)*2+2+4]; | |
451 | ||
452 | sprintf(buf, | |
453 | "%c %u:%u %s", | |
454 | S_ISCHR(st.st_mode) ? 'c' : 'b', | |
455 | major(st.st_rdev), minor(st.st_rdev), | |
456 | acc); | |
457 | ||
8c838407 LP |
458 | /* Changing the devices list of a populated cgroup might result in EINVAL, hence ignore EINVAL here. */ |
459 | ||
084c7007 RG |
460 | r = cg_set_attribute("devices", path, "devices.allow", buf); |
461 | if (r < 0) | |
2c74e12b | 462 | return log_full_errno(IN_SET(r, -ENOENT, -EROFS, -EINVAL, -EACCES, -EPERM) ? LOG_DEBUG : LOG_WARNING, |
b9839ac9 | 463 | r, "Failed to set devices.allow on %s: %m", path); |
4ad49000 | 464 | |
b9839ac9 LP |
465 | return 0; |
466 | } | |
8e274523 LP |
467 | } |
468 | ||
084c7007 | 469 | static int whitelist_major(BPFProgram *prog, const char *path, const char *name, char type, const char *acc) { |
90060676 | 470 | _cleanup_fclose_ FILE *f = NULL; |
8e8b5d2e | 471 | char buf[2+DECIMAL_STR_MAX(unsigned)+3+4]; |
90060676 | 472 | bool good = false; |
8e8b5d2e | 473 | unsigned maj; |
90060676 LP |
474 | int r; |
475 | ||
476 | assert(path); | |
477 | assert(acc); | |
4c701096 | 478 | assert(IN_SET(type, 'b', 'c')); |
90060676 | 479 | |
8e8b5d2e LP |
480 | if (streq(name, "*")) { |
481 | /* If the name is a wildcard, then apply this list to all devices of this type */ | |
482 | ||
483 | if (cg_all_unified() > 0) { | |
484 | if (!prog) | |
485 | return 0; | |
486 | ||
487 | (void) cgroup_bpf_whitelist_class(prog, type == 'c' ? BPF_DEVCG_DEV_CHAR : BPF_DEVCG_DEV_BLOCK, acc); | |
488 | } else { | |
489 | xsprintf(buf, "%c *:* %s", type, acc); | |
490 | ||
491 | r = cg_set_attribute("devices", path, "devices.allow", buf); | |
492 | if (r < 0) | |
493 | log_full_errno(IN_SET(r, -ENOENT, -EROFS, -EINVAL, -EACCES) ? LOG_DEBUG : LOG_WARNING, r, | |
494 | "Failed to set devices.allow on %s: %m", path); | |
495 | return 0; | |
496 | } | |
497 | } | |
498 | ||
499 | if (safe_atou(name, &maj) >= 0 && DEVICE_MAJOR_VALID(maj)) { | |
500 | /* The name is numeric and suitable as major. In that case, let's take is major, and create the entry | |
501 | * directly */ | |
502 | ||
503 | if (cg_all_unified() > 0) { | |
504 | if (!prog) | |
505 | return 0; | |
506 | ||
507 | (void) cgroup_bpf_whitelist_major(prog, | |
508 | type == 'c' ? BPF_DEVCG_DEV_CHAR : BPF_DEVCG_DEV_BLOCK, | |
509 | maj, acc); | |
510 | } else { | |
511 | xsprintf(buf, "%c %u:* %s", type, maj, acc); | |
512 | ||
513 | r = cg_set_attribute("devices", path, "devices.allow", buf); | |
514 | if (r < 0) | |
515 | log_full_errno(IN_SET(r, -ENOENT, -EROFS, -EINVAL, -EACCES) ? LOG_DEBUG : LOG_WARNING, r, | |
516 | "Failed to set devices.allow on %s: %m", path); | |
517 | } | |
518 | ||
519 | return 0; | |
520 | } | |
521 | ||
90060676 | 522 | f = fopen("/proc/devices", "re"); |
4a62c710 MS |
523 | if (!f) |
524 | return log_warning_errno(errno, "Cannot open /proc/devices to resolve %s (%c): %m", name, type); | |
90060676 | 525 | |
c66e60a8 LP |
526 | for (;;) { |
527 | _cleanup_free_ char *line = NULL; | |
8e8b5d2e | 528 | char *w, *p; |
90060676 | 529 | |
c66e60a8 LP |
530 | r = read_line(f, LONG_LINE_MAX, &line); |
531 | if (r < 0) | |
532 | return log_warning_errno(r, "Failed to read /proc/devices: %m"); | |
533 | if (r == 0) | |
534 | break; | |
90060676 LP |
535 | |
536 | if (type == 'c' && streq(line, "Character devices:")) { | |
537 | good = true; | |
538 | continue; | |
539 | } | |
540 | ||
541 | if (type == 'b' && streq(line, "Block devices:")) { | |
542 | good = true; | |
543 | continue; | |
544 | } | |
545 | ||
546 | if (isempty(line)) { | |
547 | good = false; | |
548 | continue; | |
549 | } | |
550 | ||
551 | if (!good) | |
552 | continue; | |
553 | ||
554 | p = strstrip(line); | |
555 | ||
556 | w = strpbrk(p, WHITESPACE); | |
557 | if (!w) | |
558 | continue; | |
559 | *w = 0; | |
560 | ||
561 | r = safe_atou(p, &maj); | |
562 | if (r < 0) | |
563 | continue; | |
564 | if (maj <= 0) | |
565 | continue; | |
566 | ||
567 | w++; | |
568 | w += strspn(w, WHITESPACE); | |
e41969e3 LP |
569 | |
570 | if (fnmatch(name, w, 0) != 0) | |
90060676 LP |
571 | continue; |
572 | ||
084c7007 RG |
573 | if (cg_all_unified() > 0) { |
574 | if (!prog) | |
575 | continue; | |
90060676 | 576 | |
913c898c LP |
577 | (void) cgroup_bpf_whitelist_major(prog, |
578 | type == 'c' ? BPF_DEVCG_DEV_CHAR : BPF_DEVCG_DEV_BLOCK, | |
579 | maj, acc); | |
084c7007 | 580 | } else { |
084c7007 RG |
581 | sprintf(buf, |
582 | "%c %u:* %s", | |
583 | type, | |
584 | maj, | |
585 | acc); | |
586 | ||
8c838407 LP |
587 | /* Changing the devices list of a populated cgroup might result in EINVAL, hence ignore EINVAL |
588 | * here. */ | |
589 | ||
084c7007 RG |
590 | r = cg_set_attribute("devices", path, "devices.allow", buf); |
591 | if (r < 0) | |
2c74e12b | 592 | log_full_errno(IN_SET(r, -ENOENT, -EROFS, -EINVAL, -EACCES, -EPERM) ? LOG_DEBUG : LOG_WARNING, |
084c7007 RG |
593 | r, "Failed to set devices.allow on %s: %m", path); |
594 | } | |
90060676 LP |
595 | } |
596 | ||
597 | return 0; | |
90060676 LP |
598 | } |
599 | ||
66ebf6c0 TH |
600 | static bool cgroup_context_has_cpu_weight(CGroupContext *c) { |
601 | return c->cpu_weight != CGROUP_WEIGHT_INVALID || | |
602 | c->startup_cpu_weight != CGROUP_WEIGHT_INVALID; | |
603 | } | |
604 | ||
605 | static bool cgroup_context_has_cpu_shares(CGroupContext *c) { | |
606 | return c->cpu_shares != CGROUP_CPU_SHARES_INVALID || | |
607 | c->startup_cpu_shares != CGROUP_CPU_SHARES_INVALID; | |
608 | } | |
609 | ||
610 | static uint64_t cgroup_context_cpu_weight(CGroupContext *c, ManagerState state) { | |
611 | if (IN_SET(state, MANAGER_STARTING, MANAGER_INITIALIZING) && | |
612 | c->startup_cpu_weight != CGROUP_WEIGHT_INVALID) | |
613 | return c->startup_cpu_weight; | |
614 | else if (c->cpu_weight != CGROUP_WEIGHT_INVALID) | |
615 | return c->cpu_weight; | |
616 | else | |
617 | return CGROUP_WEIGHT_DEFAULT; | |
618 | } | |
619 | ||
620 | static uint64_t cgroup_context_cpu_shares(CGroupContext *c, ManagerState state) { | |
621 | if (IN_SET(state, MANAGER_STARTING, MANAGER_INITIALIZING) && | |
622 | c->startup_cpu_shares != CGROUP_CPU_SHARES_INVALID) | |
623 | return c->startup_cpu_shares; | |
624 | else if (c->cpu_shares != CGROUP_CPU_SHARES_INVALID) | |
625 | return c->cpu_shares; | |
626 | else | |
627 | return CGROUP_CPU_SHARES_DEFAULT; | |
628 | } | |
629 | ||
52fecf20 LP |
630 | static void cgroup_apply_unified_cpu_weight(Unit *u, uint64_t weight) { |
631 | char buf[DECIMAL_STR_MAX(uint64_t) + 2]; | |
66ebf6c0 TH |
632 | |
633 | xsprintf(buf, "%" PRIu64 "\n", weight); | |
293d32df | 634 | (void) set_attribute_and_warn(u, "cpu", "cpu.weight", buf); |
52fecf20 LP |
635 | } |
636 | ||
637 | static void cgroup_apply_unified_cpu_quota(Unit *u, usec_t quota) { | |
638 | char buf[(DECIMAL_STR_MAX(usec_t) + 1) * 2 + 1]; | |
66ebf6c0 TH |
639 | |
640 | if (quota != USEC_INFINITY) | |
641 | xsprintf(buf, USEC_FMT " " USEC_FMT "\n", | |
642 | quota * CGROUP_CPU_QUOTA_PERIOD_USEC / USEC_PER_SEC, CGROUP_CPU_QUOTA_PERIOD_USEC); | |
643 | else | |
644 | xsprintf(buf, "max " USEC_FMT "\n", CGROUP_CPU_QUOTA_PERIOD_USEC); | |
293d32df | 645 | (void) set_attribute_and_warn(u, "cpu", "cpu.max", buf); |
66ebf6c0 TH |
646 | } |
647 | ||
52fecf20 LP |
648 | static void cgroup_apply_legacy_cpu_shares(Unit *u, uint64_t shares) { |
649 | char buf[DECIMAL_STR_MAX(uint64_t) + 2]; | |
66ebf6c0 TH |
650 | |
651 | xsprintf(buf, "%" PRIu64 "\n", shares); | |
293d32df | 652 | (void) set_attribute_and_warn(u, "cpu", "cpu.shares", buf); |
52fecf20 LP |
653 | } |
654 | ||
655 | static void cgroup_apply_legacy_cpu_quota(Unit *u, usec_t quota) { | |
656 | char buf[DECIMAL_STR_MAX(usec_t) + 2]; | |
66ebf6c0 TH |
657 | |
658 | xsprintf(buf, USEC_FMT "\n", CGROUP_CPU_QUOTA_PERIOD_USEC); | |
293d32df | 659 | (void) set_attribute_and_warn(u, "cpu", "cpu.cfs_period_us", buf); |
66ebf6c0 TH |
660 | |
661 | if (quota != USEC_INFINITY) { | |
662 | xsprintf(buf, USEC_FMT "\n", quota * CGROUP_CPU_QUOTA_PERIOD_USEC / USEC_PER_SEC); | |
293d32df | 663 | (void) set_attribute_and_warn(u, "cpu", "cpu.cfs_quota_us", buf); |
66ebf6c0 | 664 | } else |
589a5f7a | 665 | (void) set_attribute_and_warn(u, "cpu", "cpu.cfs_quota_us", "-1\n"); |
66ebf6c0 TH |
666 | } |
667 | ||
668 | static uint64_t cgroup_cpu_shares_to_weight(uint64_t shares) { | |
669 | return CLAMP(shares * CGROUP_WEIGHT_DEFAULT / CGROUP_CPU_SHARES_DEFAULT, | |
670 | CGROUP_WEIGHT_MIN, CGROUP_WEIGHT_MAX); | |
671 | } | |
672 | ||
673 | static uint64_t cgroup_cpu_weight_to_shares(uint64_t weight) { | |
674 | return CLAMP(weight * CGROUP_CPU_SHARES_DEFAULT / CGROUP_WEIGHT_DEFAULT, | |
675 | CGROUP_CPU_SHARES_MIN, CGROUP_CPU_SHARES_MAX); | |
676 | } | |
677 | ||
508c45da | 678 | static bool cgroup_context_has_io_config(CGroupContext *c) { |
538b4852 TH |
679 | return c->io_accounting || |
680 | c->io_weight != CGROUP_WEIGHT_INVALID || | |
681 | c->startup_io_weight != CGROUP_WEIGHT_INVALID || | |
682 | c->io_device_weights || | |
6ae4283c | 683 | c->io_device_latencies || |
538b4852 TH |
684 | c->io_device_limits; |
685 | } | |
686 | ||
508c45da | 687 | static bool cgroup_context_has_blockio_config(CGroupContext *c) { |
538b4852 TH |
688 | return c->blockio_accounting || |
689 | c->blockio_weight != CGROUP_BLKIO_WEIGHT_INVALID || | |
690 | c->startup_blockio_weight != CGROUP_BLKIO_WEIGHT_INVALID || | |
691 | c->blockio_device_weights || | |
692 | c->blockio_device_bandwidths; | |
693 | } | |
694 | ||
508c45da | 695 | static uint64_t cgroup_context_io_weight(CGroupContext *c, ManagerState state) { |
64faf04c TH |
696 | if (IN_SET(state, MANAGER_STARTING, MANAGER_INITIALIZING) && |
697 | c->startup_io_weight != CGROUP_WEIGHT_INVALID) | |
698 | return c->startup_io_weight; | |
699 | else if (c->io_weight != CGROUP_WEIGHT_INVALID) | |
700 | return c->io_weight; | |
701 | else | |
702 | return CGROUP_WEIGHT_DEFAULT; | |
703 | } | |
704 | ||
508c45da | 705 | static uint64_t cgroup_context_blkio_weight(CGroupContext *c, ManagerState state) { |
64faf04c TH |
706 | if (IN_SET(state, MANAGER_STARTING, MANAGER_INITIALIZING) && |
707 | c->startup_blockio_weight != CGROUP_BLKIO_WEIGHT_INVALID) | |
708 | return c->startup_blockio_weight; | |
709 | else if (c->blockio_weight != CGROUP_BLKIO_WEIGHT_INVALID) | |
710 | return c->blockio_weight; | |
711 | else | |
712 | return CGROUP_BLKIO_WEIGHT_DEFAULT; | |
713 | } | |
714 | ||
508c45da | 715 | static uint64_t cgroup_weight_blkio_to_io(uint64_t blkio_weight) { |
538b4852 TH |
716 | return CLAMP(blkio_weight * CGROUP_WEIGHT_DEFAULT / CGROUP_BLKIO_WEIGHT_DEFAULT, |
717 | CGROUP_WEIGHT_MIN, CGROUP_WEIGHT_MAX); | |
718 | } | |
719 | ||
508c45da | 720 | static uint64_t cgroup_weight_io_to_blkio(uint64_t io_weight) { |
538b4852 TH |
721 | return CLAMP(io_weight * CGROUP_BLKIO_WEIGHT_DEFAULT / CGROUP_WEIGHT_DEFAULT, |
722 | CGROUP_BLKIO_WEIGHT_MIN, CGROUP_BLKIO_WEIGHT_MAX); | |
723 | } | |
724 | ||
f29ff115 | 725 | static void cgroup_apply_io_device_weight(Unit *u, const char *dev_path, uint64_t io_weight) { |
64faf04c TH |
726 | char buf[DECIMAL_STR_MAX(dev_t)*2+2+DECIMAL_STR_MAX(uint64_t)+1]; |
727 | dev_t dev; | |
728 | int r; | |
729 | ||
730 | r = lookup_block_device(dev_path, &dev); | |
731 | if (r < 0) | |
732 | return; | |
733 | ||
734 | xsprintf(buf, "%u:%u %" PRIu64 "\n", major(dev), minor(dev), io_weight); | |
293d32df | 735 | (void) set_attribute_and_warn(u, "io", "io.weight", buf); |
64faf04c TH |
736 | } |
737 | ||
f29ff115 | 738 | static void cgroup_apply_blkio_device_weight(Unit *u, const char *dev_path, uint64_t blkio_weight) { |
64faf04c TH |
739 | char buf[DECIMAL_STR_MAX(dev_t)*2+2+DECIMAL_STR_MAX(uint64_t)+1]; |
740 | dev_t dev; | |
741 | int r; | |
742 | ||
743 | r = lookup_block_device(dev_path, &dev); | |
744 | if (r < 0) | |
745 | return; | |
746 | ||
747 | xsprintf(buf, "%u:%u %" PRIu64 "\n", major(dev), minor(dev), blkio_weight); | |
293d32df | 748 | (void) set_attribute_and_warn(u, "blkio", "blkio.weight_device", buf); |
64faf04c TH |
749 | } |
750 | ||
6ae4283c TH |
751 | static void cgroup_apply_io_device_latency(Unit *u, const char *dev_path, usec_t target) { |
752 | char buf[DECIMAL_STR_MAX(dev_t)*2+2+7+DECIMAL_STR_MAX(uint64_t)+1]; | |
753 | dev_t dev; | |
754 | int r; | |
755 | ||
756 | r = lookup_block_device(dev_path, &dev); | |
757 | if (r < 0) | |
758 | return; | |
759 | ||
760 | if (target != USEC_INFINITY) | |
761 | xsprintf(buf, "%u:%u target=%" PRIu64 "\n", major(dev), minor(dev), target); | |
762 | else | |
763 | xsprintf(buf, "%u:%u target=max\n", major(dev), minor(dev)); | |
764 | ||
293d32df | 765 | (void) set_attribute_and_warn(u, "io", "io.latency", buf); |
6ae4283c TH |
766 | } |
767 | ||
17ae2780 | 768 | static void cgroup_apply_io_device_limit(Unit *u, const char *dev_path, uint64_t *limits) { |
64faf04c TH |
769 | char limit_bufs[_CGROUP_IO_LIMIT_TYPE_MAX][DECIMAL_STR_MAX(uint64_t)]; |
770 | char buf[DECIMAL_STR_MAX(dev_t)*2+2+(6+DECIMAL_STR_MAX(uint64_t)+1)*4]; | |
771 | CGroupIOLimitType type; | |
772 | dev_t dev; | |
64faf04c TH |
773 | int r; |
774 | ||
775 | r = lookup_block_device(dev_path, &dev); | |
776 | if (r < 0) | |
17ae2780 | 777 | return; |
64faf04c | 778 | |
17ae2780 LP |
779 | for (type = 0; type < _CGROUP_IO_LIMIT_TYPE_MAX; type++) |
780 | if (limits[type] != cgroup_io_limit_defaults[type]) | |
64faf04c | 781 | xsprintf(limit_bufs[type], "%" PRIu64, limits[type]); |
17ae2780 | 782 | else |
64faf04c | 783 | xsprintf(limit_bufs[type], "%s", limits[type] == CGROUP_LIMIT_MAX ? "max" : "0"); |
64faf04c TH |
784 | |
785 | xsprintf(buf, "%u:%u rbps=%s wbps=%s riops=%s wiops=%s\n", major(dev), minor(dev), | |
786 | limit_bufs[CGROUP_IO_RBPS_MAX], limit_bufs[CGROUP_IO_WBPS_MAX], | |
787 | limit_bufs[CGROUP_IO_RIOPS_MAX], limit_bufs[CGROUP_IO_WIOPS_MAX]); | |
293d32df | 788 | (void) set_attribute_and_warn(u, "io", "io.max", buf); |
64faf04c TH |
789 | } |
790 | ||
17ae2780 | 791 | static void cgroup_apply_blkio_device_limit(Unit *u, const char *dev_path, uint64_t rbps, uint64_t wbps) { |
64faf04c TH |
792 | char buf[DECIMAL_STR_MAX(dev_t)*2+2+DECIMAL_STR_MAX(uint64_t)+1]; |
793 | dev_t dev; | |
64faf04c TH |
794 | int r; |
795 | ||
796 | r = lookup_block_device(dev_path, &dev); | |
797 | if (r < 0) | |
17ae2780 | 798 | return; |
64faf04c | 799 | |
64faf04c | 800 | sprintf(buf, "%u:%u %" PRIu64 "\n", major(dev), minor(dev), rbps); |
293d32df | 801 | (void) set_attribute_and_warn(u, "blkio", "blkio.throttle.read_bps_device", buf); |
64faf04c | 802 | |
64faf04c | 803 | sprintf(buf, "%u:%u %" PRIu64 "\n", major(dev), minor(dev), wbps); |
293d32df | 804 | (void) set_attribute_and_warn(u, "blkio", "blkio.throttle.write_bps_device", buf); |
64faf04c TH |
805 | } |
806 | ||
da4d897e | 807 | static bool cgroup_context_has_unified_memory_config(CGroupContext *c) { |
48422635 | 808 | return c->memory_min > 0 || c->memory_low > 0 || c->memory_high != CGROUP_LIMIT_MAX || c->memory_max != CGROUP_LIMIT_MAX || c->memory_swap_max != CGROUP_LIMIT_MAX; |
da4d897e TH |
809 | } |
810 | ||
f29ff115 | 811 | static void cgroup_apply_unified_memory_limit(Unit *u, const char *file, uint64_t v) { |
589a5f7a | 812 | char buf[DECIMAL_STR_MAX(uint64_t) + 1] = "max\n"; |
da4d897e TH |
813 | |
814 | if (v != CGROUP_LIMIT_MAX) | |
815 | xsprintf(buf, "%" PRIu64 "\n", v); | |
816 | ||
293d32df | 817 | (void) set_attribute_and_warn(u, "memory", file, buf); |
da4d897e TH |
818 | } |
819 | ||
0f2d84d2 | 820 | static void cgroup_apply_firewall(Unit *u) { |
0f2d84d2 LP |
821 | assert(u); |
822 | ||
acf7f253 | 823 | /* Best-effort: let's apply IP firewalling and/or accounting if that's enabled */ |
906c06f6 | 824 | |
acf7f253 | 825 | if (bpf_firewall_compile(u) < 0) |
906c06f6 DM |
826 | return; |
827 | ||
828 | (void) bpf_firewall_install(u); | |
906c06f6 DM |
829 | } |
830 | ||
831 | static void cgroup_context_apply( | |
832 | Unit *u, | |
833 | CGroupMask apply_mask, | |
906c06f6 DM |
834 | ManagerState state) { |
835 | ||
f29ff115 TH |
836 | const char *path; |
837 | CGroupContext *c; | |
52fecf20 | 838 | bool is_host_root, is_local_root; |
4ad49000 LP |
839 | int r; |
840 | ||
f29ff115 TH |
841 | assert(u); |
842 | ||
906c06f6 | 843 | /* Nothing to do? Exit early! */ |
17f14955 | 844 | if (apply_mask == 0) |
4ad49000 | 845 | return; |
8e274523 | 846 | |
52fecf20 LP |
847 | /* Some cgroup attributes are not supported on the host root cgroup, hence silently ignore them here. And other |
848 | * attributes should only be managed for cgroups further down the tree. */ | |
849 | is_local_root = unit_has_name(u, SPECIAL_ROOT_SLICE); | |
850 | is_host_root = unit_has_host_root_cgroup(u); | |
f3725e64 LP |
851 | |
852 | assert_se(c = unit_get_cgroup_context(u)); | |
853 | assert_se(path = u->cgroup_path); | |
854 | ||
52fecf20 | 855 | if (is_local_root) /* Make sure we don't try to display messages with an empty path. */ |
6da13913 | 856 | path = "/"; |
01efdf13 | 857 | |
be2c0327 LP |
858 | /* We generally ignore errors caused by read-only mounted cgroup trees (assuming we are running in a container |
859 | * then), and missing cgroups, i.e. EROFS and ENOENT. */ | |
714e2e1d | 860 | |
be2c0327 LP |
861 | /* In fully unified mode these attributes don't exist on the host cgroup root. On legacy the weights exist, but |
862 | * setting the weight makes very little sense on the host root cgroup, as there are no other cgroups at this | |
863 | * level. The quota exists there too, but any attempt to write to it is refused with EINVAL. Inside of | |
864 | * containers we want to leave control of these to the container manager (and if cgroupsv2 delegation is used | |
865 | * we couldn't even write to them if we wanted to). */ | |
866 | if ((apply_mask & CGROUP_MASK_CPU) && !is_local_root) { | |
8e274523 | 867 | |
b4cccbc1 | 868 | if (cg_all_unified() > 0) { |
be2c0327 | 869 | uint64_t weight; |
b2f8b02e | 870 | |
be2c0327 LP |
871 | if (cgroup_context_has_cpu_weight(c)) |
872 | weight = cgroup_context_cpu_weight(c, state); | |
873 | else if (cgroup_context_has_cpu_shares(c)) { | |
874 | uint64_t shares; | |
66ebf6c0 | 875 | |
be2c0327 LP |
876 | shares = cgroup_context_cpu_shares(c, state); |
877 | weight = cgroup_cpu_shares_to_weight(shares); | |
66ebf6c0 | 878 | |
be2c0327 LP |
879 | log_cgroup_compat(u, "Applying [Startup]CPUShares=%" PRIu64 " as [Startup]CPUWeight=%" PRIu64 " on %s", |
880 | shares, weight, path); | |
881 | } else | |
882 | weight = CGROUP_WEIGHT_DEFAULT; | |
66ebf6c0 | 883 | |
be2c0327 LP |
884 | cgroup_apply_unified_cpu_weight(u, weight); |
885 | cgroup_apply_unified_cpu_quota(u, c->cpu_quota_per_sec_usec); | |
66ebf6c0 | 886 | |
52fecf20 | 887 | } else { |
be2c0327 | 888 | uint64_t shares; |
52fecf20 | 889 | |
be2c0327 LP |
890 | if (cgroup_context_has_cpu_weight(c)) { |
891 | uint64_t weight; | |
52fecf20 | 892 | |
be2c0327 LP |
893 | weight = cgroup_context_cpu_weight(c, state); |
894 | shares = cgroup_cpu_weight_to_shares(weight); | |
52fecf20 | 895 | |
be2c0327 LP |
896 | log_cgroup_compat(u, "Applying [Startup]CPUWeight=%" PRIu64 " as [Startup]CPUShares=%" PRIu64 " on %s", |
897 | weight, shares, path); | |
898 | } else if (cgroup_context_has_cpu_shares(c)) | |
899 | shares = cgroup_context_cpu_shares(c, state); | |
900 | else | |
901 | shares = CGROUP_CPU_SHARES_DEFAULT; | |
66ebf6c0 | 902 | |
be2c0327 LP |
903 | cgroup_apply_legacy_cpu_shares(u, shares); |
904 | cgroup_apply_legacy_cpu_quota(u, c->cpu_quota_per_sec_usec); | |
66ebf6c0 | 905 | } |
4ad49000 LP |
906 | } |
907 | ||
52fecf20 LP |
908 | /* The 'io' controller attributes are not exported on the host's root cgroup (being a pure cgroupsv2 |
909 | * controller), and in case of containers we want to leave control of these attributes to the container manager | |
910 | * (and we couldn't access that stuff anyway, even if we tried if proper delegation is used). */ | |
911 | if ((apply_mask & CGROUP_MASK_IO) && !is_local_root) { | |
912 | char buf[8+DECIMAL_STR_MAX(uint64_t)+1]; | |
913 | bool has_io, has_blockio; | |
914 | uint64_t weight; | |
13c31542 | 915 | |
52fecf20 LP |
916 | has_io = cgroup_context_has_io_config(c); |
917 | has_blockio = cgroup_context_has_blockio_config(c); | |
13c31542 | 918 | |
52fecf20 LP |
919 | if (has_io) |
920 | weight = cgroup_context_io_weight(c, state); | |
921 | else if (has_blockio) { | |
922 | uint64_t blkio_weight; | |
128fadc9 | 923 | |
52fecf20 LP |
924 | blkio_weight = cgroup_context_blkio_weight(c, state); |
925 | weight = cgroup_weight_blkio_to_io(blkio_weight); | |
128fadc9 | 926 | |
52fecf20 LP |
927 | log_cgroup_compat(u, "Applying [Startup]BlockIOWeight %" PRIu64 " as [Startup]IOWeight %" PRIu64, |
928 | blkio_weight, weight); | |
929 | } else | |
930 | weight = CGROUP_WEIGHT_DEFAULT; | |
13c31542 | 931 | |
52fecf20 LP |
932 | xsprintf(buf, "default %" PRIu64 "\n", weight); |
933 | (void) set_attribute_and_warn(u, "io", "io.weight", buf); | |
538b4852 | 934 | |
52fecf20 LP |
935 | if (has_io) { |
936 | CGroupIODeviceLatency *latency; | |
937 | CGroupIODeviceLimit *limit; | |
938 | CGroupIODeviceWeight *w; | |
128fadc9 | 939 | |
52fecf20 LP |
940 | LIST_FOREACH(device_weights, w, c->io_device_weights) |
941 | cgroup_apply_io_device_weight(u, w->path, w->weight); | |
128fadc9 | 942 | |
52fecf20 LP |
943 | LIST_FOREACH(device_limits, limit, c->io_device_limits) |
944 | cgroup_apply_io_device_limit(u, limit->path, limit->limits); | |
6ae4283c | 945 | |
52fecf20 LP |
946 | LIST_FOREACH(device_latencies, latency, c->io_device_latencies) |
947 | cgroup_apply_io_device_latency(u, latency->path, latency->target_usec); | |
6ae4283c | 948 | |
52fecf20 LP |
949 | } else if (has_blockio) { |
950 | CGroupBlockIODeviceWeight *w; | |
951 | CGroupBlockIODeviceBandwidth *b; | |
13c31542 | 952 | |
52fecf20 LP |
953 | LIST_FOREACH(device_weights, w, c->blockio_device_weights) { |
954 | weight = cgroup_weight_blkio_to_io(w->weight); | |
17ae2780 | 955 | |
52fecf20 LP |
956 | log_cgroup_compat(u, "Applying BlockIODeviceWeight %" PRIu64 " as IODeviceWeight %" PRIu64 " for %s", |
957 | w->weight, weight, w->path); | |
538b4852 | 958 | |
52fecf20 LP |
959 | cgroup_apply_io_device_weight(u, w->path, weight); |
960 | } | |
538b4852 | 961 | |
17ae2780 | 962 | LIST_FOREACH(device_bandwidths, b, c->blockio_device_bandwidths) { |
538b4852 TH |
963 | uint64_t limits[_CGROUP_IO_LIMIT_TYPE_MAX]; |
964 | CGroupIOLimitType type; | |
965 | ||
966 | for (type = 0; type < _CGROUP_IO_LIMIT_TYPE_MAX; type++) | |
967 | limits[type] = cgroup_io_limit_defaults[type]; | |
968 | ||
969 | limits[CGROUP_IO_RBPS_MAX] = b->rbps; | |
970 | limits[CGROUP_IO_WBPS_MAX] = b->wbps; | |
971 | ||
128fadc9 TH |
972 | log_cgroup_compat(u, "Applying BlockIO{Read|Write}Bandwidth %" PRIu64 " %" PRIu64 " as IO{Read|Write}BandwidthMax for %s", |
973 | b->rbps, b->wbps, b->path); | |
974 | ||
17ae2780 | 975 | cgroup_apply_io_device_limit(u, b->path, limits); |
538b4852 | 976 | } |
13c31542 TH |
977 | } |
978 | } | |
979 | ||
906c06f6 | 980 | if (apply_mask & CGROUP_MASK_BLKIO) { |
52fecf20 | 981 | bool has_io, has_blockio; |
4ad49000 | 982 | |
52fecf20 LP |
983 | has_io = cgroup_context_has_io_config(c); |
984 | has_blockio = cgroup_context_has_blockio_config(c); | |
985 | ||
986 | /* Applying a 'weight' never makes sense for the host root cgroup, and for containers this should be | |
987 | * left to our container manager, too. */ | |
988 | if (!is_local_root) { | |
64faf04c TH |
989 | char buf[DECIMAL_STR_MAX(uint64_t)+1]; |
990 | uint64_t weight; | |
64faf04c | 991 | |
7d862ab8 | 992 | if (has_io) { |
52fecf20 | 993 | uint64_t io_weight; |
128fadc9 | 994 | |
52fecf20 | 995 | io_weight = cgroup_context_io_weight(c, state); |
538b4852 | 996 | weight = cgroup_weight_io_to_blkio(cgroup_context_io_weight(c, state)); |
128fadc9 TH |
997 | |
998 | log_cgroup_compat(u, "Applying [Startup]IOWeight %" PRIu64 " as [Startup]BlockIOWeight %" PRIu64, | |
999 | io_weight, weight); | |
7d862ab8 TH |
1000 | } else if (has_blockio) |
1001 | weight = cgroup_context_blkio_weight(c, state); | |
1002 | else | |
538b4852 | 1003 | weight = CGROUP_BLKIO_WEIGHT_DEFAULT; |
64faf04c TH |
1004 | |
1005 | xsprintf(buf, "%" PRIu64 "\n", weight); | |
293d32df | 1006 | (void) set_attribute_and_warn(u, "blkio", "blkio.weight", buf); |
4ad49000 | 1007 | |
7d862ab8 | 1008 | if (has_io) { |
538b4852 TH |
1009 | CGroupIODeviceWeight *w; |
1010 | ||
128fadc9 TH |
1011 | LIST_FOREACH(device_weights, w, c->io_device_weights) { |
1012 | weight = cgroup_weight_io_to_blkio(w->weight); | |
1013 | ||
1014 | log_cgroup_compat(u, "Applying IODeviceWeight %" PRIu64 " as BlockIODeviceWeight %" PRIu64 " for %s", | |
1015 | w->weight, weight, w->path); | |
1016 | ||
1017 | cgroup_apply_blkio_device_weight(u, w->path, weight); | |
1018 | } | |
7d862ab8 TH |
1019 | } else if (has_blockio) { |
1020 | CGroupBlockIODeviceWeight *w; | |
1021 | ||
7d862ab8 TH |
1022 | LIST_FOREACH(device_weights, w, c->blockio_device_weights) |
1023 | cgroup_apply_blkio_device_weight(u, w->path, w->weight); | |
538b4852 | 1024 | } |
4ad49000 LP |
1025 | } |
1026 | ||
52fecf20 LP |
1027 | /* The bandwith limits are something that make sense to be applied to the host's root but not container |
1028 | * roots, as there we want the container manager to handle it */ | |
1029 | if (is_host_root || !is_local_root) { | |
1030 | if (has_io) { | |
1031 | CGroupIODeviceLimit *l; | |
538b4852 | 1032 | |
52fecf20 LP |
1033 | LIST_FOREACH(device_limits, l, c->io_device_limits) { |
1034 | log_cgroup_compat(u, "Applying IO{Read|Write}Bandwidth %" PRIu64 " %" PRIu64 " as BlockIO{Read|Write}BandwidthMax for %s", | |
1035 | l->limits[CGROUP_IO_RBPS_MAX], l->limits[CGROUP_IO_WBPS_MAX], l->path); | |
128fadc9 | 1036 | |
52fecf20 LP |
1037 | cgroup_apply_blkio_device_limit(u, l->path, l->limits[CGROUP_IO_RBPS_MAX], l->limits[CGROUP_IO_WBPS_MAX]); |
1038 | } | |
1039 | } else if (has_blockio) { | |
1040 | CGroupBlockIODeviceBandwidth *b; | |
7d862ab8 | 1041 | |
52fecf20 LP |
1042 | LIST_FOREACH(device_bandwidths, b, c->blockio_device_bandwidths) |
1043 | cgroup_apply_blkio_device_limit(u, b->path, b->rbps, b->wbps); | |
1044 | } | |
d686d8a9 | 1045 | } |
8e274523 LP |
1046 | } |
1047 | ||
be2c0327 LP |
1048 | /* In unified mode 'memory' attributes do not exist on the root cgroup. In legacy mode 'memory.limit_in_bytes' |
1049 | * exists on the root cgroup, but any writes to it are refused with EINVAL. And if we run in a container we | |
1050 | * want to leave control to the container manager (and if proper cgroupsv2 delegation is used we couldn't even | |
1051 | * write to this if we wanted to.) */ | |
1052 | if ((apply_mask & CGROUP_MASK_MEMORY) && !is_local_root) { | |
efdb0237 | 1053 | |
52fecf20 | 1054 | if (cg_all_unified() > 0) { |
be2c0327 LP |
1055 | uint64_t max, swap_max = CGROUP_LIMIT_MAX; |
1056 | ||
1057 | if (cgroup_context_has_unified_memory_config(c)) { | |
1058 | max = c->memory_max; | |
1059 | swap_max = c->memory_swap_max; | |
1060 | } else { | |
1061 | max = c->memory_limit; | |
efdb0237 | 1062 | |
be2c0327 LP |
1063 | if (max != CGROUP_LIMIT_MAX) |
1064 | log_cgroup_compat(u, "Applying MemoryLimit=%" PRIu64 " as MemoryMax=", max); | |
128fadc9 | 1065 | } |
da4d897e | 1066 | |
be2c0327 LP |
1067 | cgroup_apply_unified_memory_limit(u, "memory.min", c->memory_min); |
1068 | cgroup_apply_unified_memory_limit(u, "memory.low", c->memory_low); | |
1069 | cgroup_apply_unified_memory_limit(u, "memory.high", c->memory_high); | |
1070 | cgroup_apply_unified_memory_limit(u, "memory.max", max); | |
1071 | cgroup_apply_unified_memory_limit(u, "memory.swap.max", swap_max); | |
128fadc9 | 1072 | |
be2c0327 LP |
1073 | } else { |
1074 | char buf[DECIMAL_STR_MAX(uint64_t) + 1]; | |
1075 | uint64_t val; | |
52fecf20 | 1076 | |
be2c0327 LP |
1077 | if (cgroup_context_has_unified_memory_config(c)) { |
1078 | val = c->memory_max; | |
1079 | log_cgroup_compat(u, "Applying MemoryMax=%" PRIi64 " as MemoryLimit=", val); | |
1080 | } else | |
1081 | val = c->memory_limit; | |
78a4ee59 | 1082 | |
be2c0327 LP |
1083 | if (val == CGROUP_LIMIT_MAX) |
1084 | strncpy(buf, "-1\n", sizeof(buf)); | |
1085 | else | |
1086 | xsprintf(buf, "%" PRIu64 "\n", val); | |
1087 | ||
1088 | (void) set_attribute_and_warn(u, "memory", "memory.limit_in_bytes", buf); | |
da4d897e | 1089 | } |
4ad49000 | 1090 | } |
8e274523 | 1091 | |
be2c0327 | 1092 | /* On cgroupsv2 we can apply BPF everywhere. On cgroupsv1 we apply it everywhere except for the root of |
52fecf20 LP |
1093 | * containers, where we leave this to the manager */ |
1094 | if ((apply_mask & (CGROUP_MASK_DEVICES | CGROUP_MASK_BPF_DEVICES)) && | |
1095 | (is_host_root || cg_all_unified() > 0 || !is_local_root)) { | |
084c7007 | 1096 | _cleanup_(bpf_program_unrefp) BPFProgram *prog = NULL; |
4ad49000 | 1097 | CGroupDeviceAllow *a; |
8e274523 | 1098 | |
084c7007 RG |
1099 | if (cg_all_unified() > 0) { |
1100 | r = cgroup_init_device_bpf(&prog, c->device_policy, c->device_allow); | |
1101 | if (r < 0) | |
1102 | log_unit_warning_errno(u, r, "Failed to initialize device control bpf program: %m"); | |
1103 | } else { | |
8c838407 | 1104 | /* Changing the devices list of a populated cgroup might result in EINVAL, hence ignore EINVAL |
084c7007 | 1105 | * here. */ |
714e2e1d | 1106 | |
084c7007 RG |
1107 | if (c->device_allow || c->device_policy != CGROUP_AUTO) |
1108 | r = cg_set_attribute("devices", path, "devices.deny", "a"); | |
1109 | else | |
1110 | r = cg_set_attribute("devices", path, "devices.allow", "a"); | |
1111 | if (r < 0) | |
2c74e12b LP |
1112 | log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EINVAL, -EACCES, -EPERM) ? LOG_DEBUG : LOG_WARNING, r, |
1113 | "Failed to reset devices.allow/devices.deny: %m"); | |
084c7007 | 1114 | } |
fb385181 | 1115 | |
4ad49000 LP |
1116 | if (c->device_policy == CGROUP_CLOSED || |
1117 | (c->device_policy == CGROUP_AUTO && c->device_allow)) { | |
1118 | static const char auto_devices[] = | |
7d711efb LP |
1119 | "/dev/null\0" "rwm\0" |
1120 | "/dev/zero\0" "rwm\0" | |
1121 | "/dev/full\0" "rwm\0" | |
1122 | "/dev/random\0" "rwm\0" | |
1123 | "/dev/urandom\0" "rwm\0" | |
1124 | "/dev/tty\0" "rwm\0" | |
5a7f87a9 | 1125 | "/dev/ptmx\0" "rwm\0" |
0d9e7991 | 1126 | /* Allow /run/systemd/inaccessible/{chr,blk} devices for mapping InaccessiblePaths */ |
74c48bf5 LP |
1127 | "/run/systemd/inaccessible/chr\0" "rwm\0" |
1128 | "/run/systemd/inaccessible/blk\0" "rwm\0"; | |
4ad49000 LP |
1129 | |
1130 | const char *x, *y; | |
1131 | ||
1132 | NULSTR_FOREACH_PAIR(x, y, auto_devices) | |
913c898c | 1133 | (void) whitelist_device(prog, path, x, y); |
7d711efb | 1134 | |
5a7f87a9 | 1135 | /* PTS (/dev/pts) devices may not be duplicated, but accessed */ |
913c898c | 1136 | (void) whitelist_major(prog, path, "pts", 'c', "rw"); |
4ad49000 LP |
1137 | } |
1138 | ||
1139 | LIST_FOREACH(device_allow, a, c->device_allow) { | |
fb4650aa | 1140 | char acc[4], *val; |
4ad49000 LP |
1141 | unsigned k = 0; |
1142 | ||
1143 | if (a->r) | |
1144 | acc[k++] = 'r'; | |
1145 | if (a->w) | |
1146 | acc[k++] = 'w'; | |
1147 | if (a->m) | |
1148 | acc[k++] = 'm'; | |
fb385181 | 1149 | |
4ad49000 LP |
1150 | if (k == 0) |
1151 | continue; | |
fb385181 | 1152 | |
4ad49000 | 1153 | acc[k++] = 0; |
90060676 | 1154 | |
27458ed6 | 1155 | if (path_startswith(a->path, "/dev/")) |
913c898c | 1156 | (void) whitelist_device(prog, path, a->path, acc); |
fb4650aa | 1157 | else if ((val = startswith(a->path, "block-"))) |
913c898c | 1158 | (void) whitelist_major(prog, path, val, 'b', acc); |
fb4650aa | 1159 | else if ((val = startswith(a->path, "char-"))) |
913c898c | 1160 | (void) whitelist_major(prog, path, val, 'c', acc); |
90060676 | 1161 | else |
8e8b5d2e | 1162 | log_unit_debug(u, "Ignoring device '%s' while writing cgroup attribute.", a->path); |
4ad49000 | 1163 | } |
084c7007 RG |
1164 | |
1165 | r = cgroup_apply_device_bpf(u, prog, c->device_policy, c->device_allow); | |
1166 | if (r < 0) { | |
1167 | static bool warned = false; | |
1168 | ||
1169 | log_full_errno(warned ? LOG_DEBUG : LOG_WARNING, r, | |
1170 | "Unit %s configures device ACL, but the local system doesn't seem to support the BPF-based device controller.\n" | |
1171 | "Proceeding WITHOUT applying ACL (all devices will be accessible)!\n" | |
1172 | "(This warning is only shown for the first loaded unit using device ACL.)", u->id); | |
1173 | ||
1174 | warned = true; | |
1175 | } | |
4ad49000 | 1176 | } |
03a7b521 | 1177 | |
00b5974f LP |
1178 | if (apply_mask & CGROUP_MASK_PIDS) { |
1179 | ||
52fecf20 | 1180 | if (is_host_root) { |
00b5974f LP |
1181 | /* So, the "pids" controller does not expose anything on the root cgroup, in order not to |
1182 | * replicate knobs exposed elsewhere needlessly. We abstract this away here however, and when | |
1183 | * the knobs of the root cgroup are modified propagate this to the relevant sysctls. There's a | |
1184 | * non-obvious asymmetry however: unlike the cgroup properties we don't really want to take | |
1185 | * exclusive ownership of the sysctls, but we still want to honour things if the user sets | |
1186 | * limits. Hence we employ sort of a one-way strategy: when the user sets a bounded limit | |
1187 | * through us it counts. When the user afterwards unsets it again (i.e. sets it to unbounded) | |
1188 | * it also counts. But if the user never set a limit through us (i.e. we are the default of | |
1189 | * "unbounded") we leave things unmodified. For this we manage a global boolean that we turn on | |
1190 | * the first time we set a limit. Note that this boolean is flushed out on manager reload, | |
1191 | * which is desirable so that there's an offical way to release control of the sysctl from | |
1192 | * systemd: set the limit to unbounded and reload. */ | |
1193 | ||
1194 | if (c->tasks_max != CGROUP_LIMIT_MAX) { | |
1195 | u->manager->sysctl_pid_max_changed = true; | |
1196 | r = procfs_tasks_set_limit(c->tasks_max); | |
1197 | } else if (u->manager->sysctl_pid_max_changed) | |
1198 | r = procfs_tasks_set_limit(TASKS_MAX); | |
1199 | else | |
1200 | r = 0; | |
00b5974f | 1201 | if (r < 0) |
39b9fefb | 1202 | log_unit_full(u, LOG_LEVEL_CGROUP_WRITE(r), r, |
00b5974f | 1203 | "Failed to write to tasks limit sysctls: %m"); |
52fecf20 | 1204 | } |
03a7b521 | 1205 | |
52fecf20 LP |
1206 | /* The attribute itself is not available on the host root cgroup, and in the container case we want to |
1207 | * leave it for the container manager. */ | |
1208 | if (!is_local_root) { | |
00b5974f LP |
1209 | if (c->tasks_max != CGROUP_LIMIT_MAX) { |
1210 | char buf[DECIMAL_STR_MAX(uint64_t) + 2]; | |
03a7b521 | 1211 | |
00b5974f | 1212 | sprintf(buf, "%" PRIu64 "\n", c->tasks_max); |
293d32df | 1213 | (void) set_attribute_and_warn(u, "pids", "pids.max", buf); |
00b5974f | 1214 | } else |
589a5f7a | 1215 | (void) set_attribute_and_warn(u, "pids", "pids.max", "max\n"); |
00b5974f | 1216 | } |
03a7b521 | 1217 | } |
906c06f6 | 1218 | |
17f14955 | 1219 | if (apply_mask & CGROUP_MASK_BPF_FIREWALL) |
0f2d84d2 | 1220 | cgroup_apply_firewall(u); |
fb385181 LP |
1221 | } |
1222 | ||
16492445 LP |
1223 | static bool unit_get_needs_bpf_firewall(Unit *u) { |
1224 | CGroupContext *c; | |
1225 | Unit *p; | |
1226 | assert(u); | |
1227 | ||
1228 | c = unit_get_cgroup_context(u); | |
1229 | if (!c) | |
1230 | return false; | |
1231 | ||
1232 | if (c->ip_accounting || | |
1233 | c->ip_address_allow || | |
1234 | c->ip_address_deny) | |
1235 | return true; | |
1236 | ||
1237 | /* If any parent slice has an IP access list defined, it applies too */ | |
1238 | for (p = UNIT_DEREF(u->slice); p; p = UNIT_DEREF(p->slice)) { | |
1239 | c = unit_get_cgroup_context(p); | |
1240 | if (!c) | |
1241 | return false; | |
1242 | ||
1243 | if (c->ip_address_allow || | |
1244 | c->ip_address_deny) | |
1245 | return true; | |
1246 | } | |
1247 | ||
1248 | return false; | |
1249 | } | |
1250 | ||
53aea74a | 1251 | static CGroupMask cgroup_context_get_mask(CGroupContext *c) { |
efdb0237 | 1252 | CGroupMask mask = 0; |
8e274523 | 1253 | |
fae9bc29 | 1254 | /* Figure out which controllers we need, based on the cgroup context object */ |
8e274523 | 1255 | |
fae9bc29 | 1256 | if (c->cpu_accounting) |
f98c2585 | 1257 | mask |= get_cpu_accounting_mask(); |
fae9bc29 LP |
1258 | |
1259 | if (cgroup_context_has_cpu_weight(c) || | |
66ebf6c0 | 1260 | cgroup_context_has_cpu_shares(c) || |
3a43da28 | 1261 | c->cpu_quota_per_sec_usec != USEC_INFINITY) |
fae9bc29 | 1262 | mask |= CGROUP_MASK_CPU; |
ecedd90f | 1263 | |
538b4852 TH |
1264 | if (cgroup_context_has_io_config(c) || cgroup_context_has_blockio_config(c)) |
1265 | mask |= CGROUP_MASK_IO | CGROUP_MASK_BLKIO; | |
ecedd90f | 1266 | |
4ad49000 | 1267 | if (c->memory_accounting || |
da4d897e TH |
1268 | c->memory_limit != CGROUP_LIMIT_MAX || |
1269 | cgroup_context_has_unified_memory_config(c)) | |
efdb0237 | 1270 | mask |= CGROUP_MASK_MEMORY; |
8e274523 | 1271 | |
a931ad47 LP |
1272 | if (c->device_allow || |
1273 | c->device_policy != CGROUP_AUTO) | |
084c7007 | 1274 | mask |= CGROUP_MASK_DEVICES | CGROUP_MASK_BPF_DEVICES; |
4ad49000 | 1275 | |
03a7b521 | 1276 | if (c->tasks_accounting || |
8793fa25 | 1277 | c->tasks_max != CGROUP_LIMIT_MAX) |
03a7b521 LP |
1278 | mask |= CGROUP_MASK_PIDS; |
1279 | ||
fae9bc29 | 1280 | return CGROUP_MASK_EXTEND_JOINED(mask); |
8e274523 LP |
1281 | } |
1282 | ||
53aea74a | 1283 | static CGroupMask unit_get_bpf_mask(Unit *u) { |
17f14955 RG |
1284 | CGroupMask mask = 0; |
1285 | ||
fae9bc29 LP |
1286 | /* Figure out which controllers we need, based on the cgroup context, possibly taking into account children |
1287 | * too. */ | |
1288 | ||
17f14955 RG |
1289 | if (unit_get_needs_bpf_firewall(u)) |
1290 | mask |= CGROUP_MASK_BPF_FIREWALL; | |
1291 | ||
1292 | return mask; | |
1293 | } | |
1294 | ||
efdb0237 | 1295 | CGroupMask unit_get_own_mask(Unit *u) { |
4ad49000 | 1296 | CGroupContext *c; |
8e274523 | 1297 | |
442ce775 LP |
1298 | /* Returns the mask of controllers the unit needs for itself. If a unit is not properly loaded, return an empty |
1299 | * mask, as we shouldn't reflect it in the cgroup hierarchy then. */ | |
1300 | ||
1301 | if (u->load_state != UNIT_LOADED) | |
1302 | return 0; | |
efdb0237 | 1303 | |
4ad49000 LP |
1304 | c = unit_get_cgroup_context(u); |
1305 | if (!c) | |
1306 | return 0; | |
8e274523 | 1307 | |
17f14955 | 1308 | return cgroup_context_get_mask(c) | unit_get_bpf_mask(u) | unit_get_delegate_mask(u); |
02638280 LP |
1309 | } |
1310 | ||
1311 | CGroupMask unit_get_delegate_mask(Unit *u) { | |
1312 | CGroupContext *c; | |
1313 | ||
1314 | /* If delegation is turned on, then turn on selected controllers, unless we are on the legacy hierarchy and the | |
1315 | * process we fork into is known to drop privileges, and hence shouldn't get access to the controllers. | |
19af675e | 1316 | * |
02638280 | 1317 | * Note that on the unified hierarchy it is safe to delegate controllers to unprivileged services. */ |
a931ad47 | 1318 | |
1d9cc876 | 1319 | if (!unit_cgroup_delegate(u)) |
02638280 LP |
1320 | return 0; |
1321 | ||
1322 | if (cg_all_unified() <= 0) { | |
a931ad47 LP |
1323 | ExecContext *e; |
1324 | ||
1325 | e = unit_get_exec_context(u); | |
02638280 LP |
1326 | if (e && !exec_context_maintains_privileges(e)) |
1327 | return 0; | |
a931ad47 LP |
1328 | } |
1329 | ||
1d9cc876 | 1330 | assert_se(c = unit_get_cgroup_context(u)); |
fae9bc29 | 1331 | return CGROUP_MASK_EXTEND_JOINED(c->delegate_controllers); |
8e274523 LP |
1332 | } |
1333 | ||
efdb0237 | 1334 | CGroupMask unit_get_members_mask(Unit *u) { |
4ad49000 | 1335 | assert(u); |
bc432dc7 | 1336 | |
02638280 | 1337 | /* Returns the mask of controllers all of the unit's children require, merged */ |
efdb0237 | 1338 | |
bc432dc7 | 1339 | if (u->cgroup_members_mask_valid) |
26a17ca2 | 1340 | return u->cgroup_members_mask; /* Use cached value if possible */ |
bc432dc7 | 1341 | |
64e844e5 | 1342 | u->cgroup_members_mask = 0; |
bc432dc7 LP |
1343 | |
1344 | if (u->type == UNIT_SLICE) { | |
eef85c4a | 1345 | void *v; |
bc432dc7 LP |
1346 | Unit *member; |
1347 | Iterator i; | |
1348 | ||
eef85c4a | 1349 | HASHMAP_FOREACH_KEY(v, member, u->dependencies[UNIT_BEFORE], i) { |
bc432dc7 LP |
1350 | |
1351 | if (member == u) | |
1352 | continue; | |
1353 | ||
d4fdc205 | 1354 | if (UNIT_DEREF(member->slice) != u) |
bc432dc7 LP |
1355 | continue; |
1356 | ||
31604970 | 1357 | u->cgroup_members_mask |= unit_get_subtree_mask(member); /* note that this calls ourselves again, for the children */ |
bc432dc7 LP |
1358 | } |
1359 | } | |
1360 | ||
1361 | u->cgroup_members_mask_valid = true; | |
6414b7c9 | 1362 | return u->cgroup_members_mask; |
246aa6dd LP |
1363 | } |
1364 | ||
efdb0237 | 1365 | CGroupMask unit_get_siblings_mask(Unit *u) { |
4ad49000 | 1366 | assert(u); |
246aa6dd | 1367 | |
efdb0237 LP |
1368 | /* Returns the mask of controllers all of the unit's siblings |
1369 | * require, i.e. the members mask of the unit's parent slice | |
1370 | * if there is one. */ | |
1371 | ||
bc432dc7 | 1372 | if (UNIT_ISSET(u->slice)) |
637f421e | 1373 | return unit_get_members_mask(UNIT_DEREF(u->slice)); |
4ad49000 | 1374 | |
64e844e5 | 1375 | return unit_get_subtree_mask(u); /* we are the top-level slice */ |
246aa6dd LP |
1376 | } |
1377 | ||
efdb0237 LP |
1378 | CGroupMask unit_get_subtree_mask(Unit *u) { |
1379 | ||
1380 | /* Returns the mask of this subtree, meaning of the group | |
1381 | * itself and its children. */ | |
1382 | ||
1383 | return unit_get_own_mask(u) | unit_get_members_mask(u); | |
1384 | } | |
1385 | ||
1386 | CGroupMask unit_get_target_mask(Unit *u) { | |
1387 | CGroupMask mask; | |
1388 | ||
1389 | /* This returns the cgroup mask of all controllers to enable | |
1390 | * for a specific cgroup, i.e. everything it needs itself, | |
1391 | * plus all that its children need, plus all that its siblings | |
1392 | * need. This is primarily useful on the legacy cgroup | |
1393 | * hierarchy, where we need to duplicate each cgroup in each | |
1394 | * hierarchy that shall be enabled for it. */ | |
6414b7c9 | 1395 | |
efdb0237 LP |
1396 | mask = unit_get_own_mask(u) | unit_get_members_mask(u) | unit_get_siblings_mask(u); |
1397 | mask &= u->manager->cgroup_supported; | |
1398 | ||
1399 | return mask; | |
1400 | } | |
1401 | ||
1402 | CGroupMask unit_get_enable_mask(Unit *u) { | |
1403 | CGroupMask mask; | |
1404 | ||
1405 | /* This returns the cgroup mask of all controllers to enable | |
1406 | * for the children of a specific cgroup. This is primarily | |
1407 | * useful for the unified cgroup hierarchy, where each cgroup | |
1408 | * controls which controllers are enabled for its children. */ | |
1409 | ||
1410 | mask = unit_get_members_mask(u); | |
6414b7c9 DS |
1411 | mask &= u->manager->cgroup_supported; |
1412 | ||
1413 | return mask; | |
1414 | } | |
1415 | ||
5af88058 | 1416 | void unit_invalidate_cgroup_members_masks(Unit *u) { |
bc432dc7 LP |
1417 | assert(u); |
1418 | ||
5af88058 LP |
1419 | /* Recurse invalidate the member masks cache all the way up the tree */ |
1420 | u->cgroup_members_mask_valid = false; | |
bc432dc7 | 1421 | |
5af88058 LP |
1422 | if (UNIT_ISSET(u->slice)) |
1423 | unit_invalidate_cgroup_members_masks(UNIT_DEREF(u->slice)); | |
6414b7c9 DS |
1424 | } |
1425 | ||
6592b975 | 1426 | const char *unit_get_realized_cgroup_path(Unit *u, CGroupMask mask) { |
03b90d4b | 1427 | |
6592b975 | 1428 | /* Returns the realized cgroup path of the specified unit where all specified controllers are available. */ |
03b90d4b LP |
1429 | |
1430 | while (u) { | |
6592b975 | 1431 | |
03b90d4b LP |
1432 | if (u->cgroup_path && |
1433 | u->cgroup_realized && | |
d94a24ca | 1434 | FLAGS_SET(u->cgroup_realized_mask, mask)) |
03b90d4b LP |
1435 | return u->cgroup_path; |
1436 | ||
1437 | u = UNIT_DEREF(u->slice); | |
1438 | } | |
1439 | ||
1440 | return NULL; | |
1441 | } | |
1442 | ||
6592b975 LP |
1443 | static const char *migrate_callback(CGroupMask mask, void *userdata) { |
1444 | return unit_get_realized_cgroup_path(userdata, mask); | |
1445 | } | |
1446 | ||
efdb0237 LP |
1447 | char *unit_default_cgroup_path(Unit *u) { |
1448 | _cleanup_free_ char *escaped = NULL, *slice = NULL; | |
1449 | int r; | |
1450 | ||
1451 | assert(u); | |
1452 | ||
1453 | if (unit_has_name(u, SPECIAL_ROOT_SLICE)) | |
1454 | return strdup(u->manager->cgroup_root); | |
1455 | ||
1456 | if (UNIT_ISSET(u->slice) && !unit_has_name(UNIT_DEREF(u->slice), SPECIAL_ROOT_SLICE)) { | |
1457 | r = cg_slice_to_path(UNIT_DEREF(u->slice)->id, &slice); | |
1458 | if (r < 0) | |
1459 | return NULL; | |
1460 | } | |
1461 | ||
1462 | escaped = cg_escape(u->id); | |
1463 | if (!escaped) | |
1464 | return NULL; | |
1465 | ||
1466 | if (slice) | |
605405c6 ZJS |
1467 | return strjoin(u->manager->cgroup_root, "/", slice, "/", |
1468 | escaped); | |
efdb0237 | 1469 | else |
605405c6 | 1470 | return strjoin(u->manager->cgroup_root, "/", escaped); |
efdb0237 LP |
1471 | } |
1472 | ||
1473 | int unit_set_cgroup_path(Unit *u, const char *path) { | |
1474 | _cleanup_free_ char *p = NULL; | |
1475 | int r; | |
1476 | ||
1477 | assert(u); | |
1478 | ||
1479 | if (path) { | |
1480 | p = strdup(path); | |
1481 | if (!p) | |
1482 | return -ENOMEM; | |
1483 | } else | |
1484 | p = NULL; | |
1485 | ||
1486 | if (streq_ptr(u->cgroup_path, p)) | |
1487 | return 0; | |
1488 | ||
1489 | if (p) { | |
1490 | r = hashmap_put(u->manager->cgroup_unit, p, u); | |
1491 | if (r < 0) | |
1492 | return r; | |
1493 | } | |
1494 | ||
1495 | unit_release_cgroup(u); | |
1496 | ||
ae2a15bc | 1497 | u->cgroup_path = TAKE_PTR(p); |
efdb0237 LP |
1498 | |
1499 | return 1; | |
1500 | } | |
1501 | ||
1502 | int unit_watch_cgroup(Unit *u) { | |
ab2c3861 | 1503 | _cleanup_free_ char *events = NULL; |
efdb0237 LP |
1504 | int r; |
1505 | ||
1506 | assert(u); | |
1507 | ||
1508 | if (!u->cgroup_path) | |
1509 | return 0; | |
1510 | ||
1511 | if (u->cgroup_inotify_wd >= 0) | |
1512 | return 0; | |
1513 | ||
1514 | /* Only applies to the unified hierarchy */ | |
c22800e4 | 1515 | r = cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER); |
b4cccbc1 LP |
1516 | if (r < 0) |
1517 | return log_error_errno(r, "Failed to determine whether the name=systemd hierarchy is unified: %m"); | |
1518 | if (r == 0) | |
efdb0237 LP |
1519 | return 0; |
1520 | ||
1521 | /* Don't watch the root slice, it's pointless. */ | |
1522 | if (unit_has_name(u, SPECIAL_ROOT_SLICE)) | |
1523 | return 0; | |
1524 | ||
1525 | r = hashmap_ensure_allocated(&u->manager->cgroup_inotify_wd_unit, &trivial_hash_ops); | |
1526 | if (r < 0) | |
1527 | return log_oom(); | |
1528 | ||
ab2c3861 | 1529 | r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, "cgroup.events", &events); |
efdb0237 LP |
1530 | if (r < 0) |
1531 | return log_oom(); | |
1532 | ||
ab2c3861 | 1533 | u->cgroup_inotify_wd = inotify_add_watch(u->manager->cgroup_inotify_fd, events, IN_MODIFY); |
efdb0237 LP |
1534 | if (u->cgroup_inotify_wd < 0) { |
1535 | ||
1536 | if (errno == ENOENT) /* If the directory is already | |
1537 | * gone we don't need to track | |
1538 | * it, so this is not an error */ | |
1539 | return 0; | |
1540 | ||
1541 | return log_unit_error_errno(u, errno, "Failed to add inotify watch descriptor for control group %s: %m", u->cgroup_path); | |
1542 | } | |
1543 | ||
1544 | r = hashmap_put(u->manager->cgroup_inotify_wd_unit, INT_TO_PTR(u->cgroup_inotify_wd), u); | |
1545 | if (r < 0) | |
1546 | return log_unit_error_errno(u, r, "Failed to add inotify watch descriptor to hash map: %m"); | |
1547 | ||
1548 | return 0; | |
1549 | } | |
1550 | ||
a4634b21 LP |
1551 | int unit_pick_cgroup_path(Unit *u) { |
1552 | _cleanup_free_ char *path = NULL; | |
1553 | int r; | |
1554 | ||
1555 | assert(u); | |
1556 | ||
1557 | if (u->cgroup_path) | |
1558 | return 0; | |
1559 | ||
1560 | if (!UNIT_HAS_CGROUP_CONTEXT(u)) | |
1561 | return -EINVAL; | |
1562 | ||
1563 | path = unit_default_cgroup_path(u); | |
1564 | if (!path) | |
1565 | return log_oom(); | |
1566 | ||
1567 | r = unit_set_cgroup_path(u, path); | |
1568 | if (r == -EEXIST) | |
1569 | return log_unit_error_errno(u, r, "Control group %s exists already.", path); | |
1570 | if (r < 0) | |
1571 | return log_unit_error_errno(u, r, "Failed to set unit's control group path to %s: %m", path); | |
1572 | ||
1573 | return 0; | |
1574 | } | |
1575 | ||
efdb0237 LP |
1576 | static int unit_create_cgroup( |
1577 | Unit *u, | |
1578 | CGroupMask target_mask, | |
17f14955 | 1579 | CGroupMask enable_mask) { |
efdb0237 | 1580 | |
65be7e06 | 1581 | bool created; |
27adcc97 | 1582 | int r; |
64747e2d | 1583 | |
4ad49000 | 1584 | assert(u); |
64747e2d | 1585 | |
27c4ed79 | 1586 | if (!UNIT_HAS_CGROUP_CONTEXT(u)) |
0cd385d3 LP |
1587 | return 0; |
1588 | ||
a4634b21 LP |
1589 | /* Figure out our cgroup path */ |
1590 | r = unit_pick_cgroup_path(u); | |
1591 | if (r < 0) | |
1592 | return r; | |
b58b8e11 | 1593 | |
03b90d4b | 1594 | /* First, create our own group */ |
efdb0237 | 1595 | r = cg_create_everywhere(u->manager->cgroup_supported, target_mask, u->cgroup_path); |
23bbb0de | 1596 | if (r < 0) |
efdb0237 | 1597 | return log_unit_error_errno(u, r, "Failed to create cgroup %s: %m", u->cgroup_path); |
490c5a37 | 1598 | created = r; |
efdb0237 LP |
1599 | |
1600 | /* Start watching it */ | |
1601 | (void) unit_watch_cgroup(u); | |
1602 | ||
65be7e06 | 1603 | /* Preserve enabled controllers in delegated units, adjust others. */ |
1fd3a10c | 1604 | if (created || !u->cgroup_realized || !unit_cgroup_delegate(u)) { |
27adcc97 | 1605 | CGroupMask result_mask = 0; |
65be7e06 ZJS |
1606 | |
1607 | /* Enable all controllers we need */ | |
27adcc97 | 1608 | r = cg_enable_everywhere(u->manager->cgroup_supported, enable_mask, u->cgroup_path, &result_mask); |
65be7e06 | 1609 | if (r < 0) |
27adcc97 LP |
1610 | log_unit_warning_errno(u, r, "Failed to enable/disable controllers on cgroup %s, ignoring: %m", u->cgroup_path); |
1611 | ||
1612 | /* If we just turned off a controller, this might release the controller for our parent too, let's | |
1613 | * enqueue the parent for re-realization in that case again. */ | |
1614 | if (UNIT_ISSET(u->slice)) { | |
1615 | CGroupMask turned_off; | |
1616 | ||
1617 | turned_off = (u->cgroup_realized ? u->cgroup_enabled_mask & ~result_mask : 0); | |
1618 | if (turned_off != 0) { | |
1619 | Unit *parent; | |
1620 | ||
1621 | /* Force the parent to propagate the enable mask to the kernel again, by invalidating | |
1622 | * the controller we just turned off. */ | |
1623 | ||
1624 | for (parent = UNIT_DEREF(u->slice); parent; parent = UNIT_DEREF(parent->slice)) | |
1625 | unit_invalidate_cgroup(parent, turned_off); | |
1626 | } | |
1627 | } | |
1628 | ||
1629 | /* Remember what's actually enabled now */ | |
1630 | u->cgroup_enabled_mask = result_mask; | |
65be7e06 | 1631 | } |
03b90d4b LP |
1632 | |
1633 | /* Keep track that this is now realized */ | |
4ad49000 | 1634 | u->cgroup_realized = true; |
efdb0237 | 1635 | u->cgroup_realized_mask = target_mask; |
4ad49000 | 1636 | |
1d9cc876 | 1637 | if (u->type != UNIT_SLICE && !unit_cgroup_delegate(u)) { |
0cd385d3 LP |
1638 | |
1639 | /* Then, possibly move things over, but not if | |
1640 | * subgroups may contain processes, which is the case | |
1641 | * for slice and delegation units. */ | |
1642 | r = cg_migrate_everywhere(u->manager->cgroup_supported, u->cgroup_path, u->cgroup_path, migrate_callback, u); | |
1643 | if (r < 0) | |
efdb0237 | 1644 | log_unit_warning_errno(u, r, "Failed to migrate cgroup from to %s, ignoring: %m", u->cgroup_path); |
0cd385d3 | 1645 | } |
03b90d4b | 1646 | |
64747e2d LP |
1647 | return 0; |
1648 | } | |
1649 | ||
6592b975 LP |
1650 | static int unit_attach_pid_to_cgroup_via_bus(Unit *u, pid_t pid, const char *suffix_path) { |
1651 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; | |
1652 | char *pp; | |
7b3fd631 | 1653 | int r; |
6592b975 | 1654 | |
7b3fd631 LP |
1655 | assert(u); |
1656 | ||
6592b975 LP |
1657 | if (MANAGER_IS_SYSTEM(u->manager)) |
1658 | return -EINVAL; | |
1659 | ||
1660 | if (!u->manager->system_bus) | |
1661 | return -EIO; | |
1662 | ||
1663 | if (!u->cgroup_path) | |
1664 | return -EINVAL; | |
1665 | ||
1666 | /* Determine this unit's cgroup path relative to our cgroup root */ | |
1667 | pp = path_startswith(u->cgroup_path, u->manager->cgroup_root); | |
1668 | if (!pp) | |
1669 | return -EINVAL; | |
1670 | ||
1671 | pp = strjoina("/", pp, suffix_path); | |
858d36c1 | 1672 | path_simplify(pp, false); |
6592b975 LP |
1673 | |
1674 | r = sd_bus_call_method(u->manager->system_bus, | |
1675 | "org.freedesktop.systemd1", | |
1676 | "/org/freedesktop/systemd1", | |
1677 | "org.freedesktop.systemd1.Manager", | |
1678 | "AttachProcessesToUnit", | |
1679 | &error, NULL, | |
1680 | "ssau", | |
1681 | NULL /* empty unit name means client's unit, i.e. us */, pp, 1, (uint32_t) pid); | |
7b3fd631 | 1682 | if (r < 0) |
6592b975 LP |
1683 | return log_unit_debug_errno(u, r, "Failed to attach unit process " PID_FMT " via the bus: %s", pid, bus_error_message(&error, r)); |
1684 | ||
1685 | return 0; | |
1686 | } | |
1687 | ||
1688 | int unit_attach_pids_to_cgroup(Unit *u, Set *pids, const char *suffix_path) { | |
1689 | CGroupMask delegated_mask; | |
1690 | const char *p; | |
1691 | Iterator i; | |
1692 | void *pidp; | |
1693 | int r, q; | |
1694 | ||
1695 | assert(u); | |
1696 | ||
1697 | if (!UNIT_HAS_CGROUP_CONTEXT(u)) | |
1698 | return -EINVAL; | |
1699 | ||
1700 | if (set_isempty(pids)) | |
1701 | return 0; | |
7b3fd631 | 1702 | |
6592b975 | 1703 | r = unit_realize_cgroup(u); |
7b3fd631 LP |
1704 | if (r < 0) |
1705 | return r; | |
1706 | ||
6592b975 LP |
1707 | if (isempty(suffix_path)) |
1708 | p = u->cgroup_path; | |
1709 | else | |
1710 | p = strjoina(u->cgroup_path, "/", suffix_path); | |
1711 | ||
1712 | delegated_mask = unit_get_delegate_mask(u); | |
1713 | ||
1714 | r = 0; | |
1715 | SET_FOREACH(pidp, pids, i) { | |
1716 | pid_t pid = PTR_TO_PID(pidp); | |
1717 | CGroupController c; | |
1718 | ||
1719 | /* First, attach the PID to the main cgroup hierarchy */ | |
1720 | q = cg_attach(SYSTEMD_CGROUP_CONTROLLER, p, pid); | |
1721 | if (q < 0) { | |
1722 | log_unit_debug_errno(u, q, "Couldn't move process " PID_FMT " to requested cgroup '%s': %m", pid, p); | |
1723 | ||
1724 | if (MANAGER_IS_USER(u->manager) && IN_SET(q, -EPERM, -EACCES)) { | |
1725 | int z; | |
1726 | ||
1727 | /* If we are in a user instance, and we can't move the process ourselves due to | |
1728 | * permission problems, let's ask the system instance about it instead. Since it's more | |
1729 | * privileged it might be able to move the process across the leaves of a subtree who's | |
1730 | * top node is not owned by us. */ | |
1731 | ||
1732 | z = unit_attach_pid_to_cgroup_via_bus(u, pid, suffix_path); | |
1733 | if (z < 0) | |
1734 | log_unit_debug_errno(u, z, "Couldn't move process " PID_FMT " to requested cgroup '%s' via the system bus either: %m", pid, p); | |
1735 | else | |
1736 | continue; /* When the bus thing worked via the bus we are fully done for this PID. */ | |
1737 | } | |
1738 | ||
1739 | if (r >= 0) | |
1740 | r = q; /* Remember first error */ | |
1741 | ||
1742 | continue; | |
1743 | } | |
1744 | ||
1745 | q = cg_all_unified(); | |
1746 | if (q < 0) | |
1747 | return q; | |
1748 | if (q > 0) | |
1749 | continue; | |
1750 | ||
1751 | /* In the legacy hierarchy, attach the process to the request cgroup if possible, and if not to the | |
1752 | * innermost realized one */ | |
1753 | ||
1754 | for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) { | |
1755 | CGroupMask bit = CGROUP_CONTROLLER_TO_MASK(c); | |
1756 | const char *realized; | |
1757 | ||
1758 | if (!(u->manager->cgroup_supported & bit)) | |
1759 | continue; | |
1760 | ||
1761 | /* If this controller is delegated and realized, honour the caller's request for the cgroup suffix. */ | |
1762 | if (delegated_mask & u->cgroup_realized_mask & bit) { | |
1763 | q = cg_attach(cgroup_controller_to_string(c), p, pid); | |
1764 | if (q >= 0) | |
1765 | continue; /* Success! */ | |
1766 | ||
1767 | log_unit_debug_errno(u, q, "Failed to attach PID " PID_FMT " to requested cgroup %s in controller %s, falling back to unit's cgroup: %m", | |
1768 | pid, p, cgroup_controller_to_string(c)); | |
1769 | } | |
1770 | ||
1771 | /* So this controller is either not delegate or realized, or something else weird happened. In | |
1772 | * that case let's attach the PID at least to the closest cgroup up the tree that is | |
1773 | * realized. */ | |
1774 | realized = unit_get_realized_cgroup_path(u, bit); | |
1775 | if (!realized) | |
1776 | continue; /* Not even realized in the root slice? Then let's not bother */ | |
1777 | ||
1778 | q = cg_attach(cgroup_controller_to_string(c), realized, pid); | |
1779 | if (q < 0) | |
1780 | log_unit_debug_errno(u, q, "Failed to attach PID " PID_FMT " to realized cgroup %s in controller %s, ignoring: %m", | |
1781 | pid, realized, cgroup_controller_to_string(c)); | |
1782 | } | |
1783 | } | |
1784 | ||
1785 | return r; | |
7b3fd631 LP |
1786 | } |
1787 | ||
4b58153d LP |
1788 | static void cgroup_xattr_apply(Unit *u) { |
1789 | char ids[SD_ID128_STRING_MAX]; | |
1790 | int r; | |
1791 | ||
1792 | assert(u); | |
1793 | ||
1794 | if (!MANAGER_IS_SYSTEM(u->manager)) | |
1795 | return; | |
1796 | ||
1797 | if (sd_id128_is_null(u->invocation_id)) | |
1798 | return; | |
1799 | ||
1800 | r = cg_set_xattr(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, | |
1801 | "trusted.invocation_id", | |
1802 | sd_id128_to_string(u->invocation_id, ids), 32, | |
1803 | 0); | |
1804 | if (r < 0) | |
0fb84499 | 1805 | log_unit_debug_errno(u, r, "Failed to set invocation ID on control group %s, ignoring: %m", u->cgroup_path); |
4b58153d LP |
1806 | } |
1807 | ||
906c06f6 DM |
1808 | static bool unit_has_mask_realized( |
1809 | Unit *u, | |
1810 | CGroupMask target_mask, | |
17f14955 | 1811 | CGroupMask enable_mask) { |
906c06f6 | 1812 | |
bc432dc7 LP |
1813 | assert(u); |
1814 | ||
d5095dcd LP |
1815 | /* Returns true if this unit is fully realized. We check four things: |
1816 | * | |
1817 | * 1. Whether the cgroup was created at all | |
1818 | * 2. Whether the cgroup was created in all the hierarchies we need it to be created in (in case of cgroupsv1) | |
1819 | * 3. Whether the cgroup has all the right controllers enabled (in case of cgroupsv2) | |
1820 | * 4. Whether the invalidation mask is currently zero | |
1821 | * | |
1822 | * If you wonder why we mask the target realization and enable mask with CGROUP_MASK_V1/CGROUP_MASK_V2: note | |
1823 | * that there are three sets of bitmasks: CGROUP_MASK_V1 (for real cgroupv1 controllers), CGROUP_MASK_V2 (for | |
1824 | * real cgroupv2 controllers) and CGROUP_MASK_BPF (for BPF-based pseudo-controllers). Now, cgroup_realized_mask | |
1825 | * is only matters for cgroupsv1 controllers, and cgroup_enabled_mask only used for cgroupsv2, and if they | |
1826 | * differ in the others, we don't really care. (After all, the cgroup_enabled_mask tracks with controllers are | |
1827 | * enabled through cgroup.subtree_control, and since the BPF pseudo-controllers don't show up there, they | |
1828 | * simply don't matter. */ | |
1829 | ||
906c06f6 | 1830 | return u->cgroup_realized && |
d5095dcd LP |
1831 | ((u->cgroup_realized_mask ^ target_mask) & CGROUP_MASK_V1) == 0 && |
1832 | ((u->cgroup_enabled_mask ^ enable_mask) & CGROUP_MASK_V2) == 0 && | |
17f14955 | 1833 | u->cgroup_invalidated_mask == 0; |
6414b7c9 DS |
1834 | } |
1835 | ||
27adcc97 | 1836 | void unit_add_to_cgroup_realize_queue(Unit *u) { |
2aa57a65 LP |
1837 | assert(u); |
1838 | ||
1839 | if (u->in_cgroup_realize_queue) | |
1840 | return; | |
1841 | ||
1842 | LIST_PREPEND(cgroup_realize_queue, u->manager->cgroup_realize_queue, u); | |
1843 | u->in_cgroup_realize_queue = true; | |
1844 | } | |
1845 | ||
1846 | static void unit_remove_from_cgroup_realize_queue(Unit *u) { | |
1847 | assert(u); | |
1848 | ||
1849 | if (!u->in_cgroup_realize_queue) | |
1850 | return; | |
1851 | ||
1852 | LIST_REMOVE(cgroup_realize_queue, u->manager->cgroup_realize_queue, u); | |
1853 | u->in_cgroup_realize_queue = false; | |
1854 | } | |
1855 | ||
6414b7c9 DS |
1856 | /* Check if necessary controllers and attributes for a unit are in place. |
1857 | * | |
1858 | * If so, do nothing. | |
1859 | * If not, create paths, move processes over, and set attributes. | |
1860 | * | |
1861 | * Returns 0 on success and < 0 on failure. */ | |
db785129 | 1862 | static int unit_realize_cgroup_now(Unit *u, ManagerState state) { |
efdb0237 | 1863 | CGroupMask target_mask, enable_mask; |
6414b7c9 | 1864 | int r; |
64747e2d | 1865 | |
4ad49000 | 1866 | assert(u); |
64747e2d | 1867 | |
2aa57a65 | 1868 | unit_remove_from_cgroup_realize_queue(u); |
64747e2d | 1869 | |
efdb0237 | 1870 | target_mask = unit_get_target_mask(u); |
ccf78df1 TH |
1871 | enable_mask = unit_get_enable_mask(u); |
1872 | ||
17f14955 | 1873 | if (unit_has_mask_realized(u, target_mask, enable_mask)) |
0a1eb06d | 1874 | return 0; |
64747e2d | 1875 | |
4ad49000 | 1876 | /* First, realize parents */ |
6414b7c9 | 1877 | if (UNIT_ISSET(u->slice)) { |
db785129 | 1878 | r = unit_realize_cgroup_now(UNIT_DEREF(u->slice), state); |
6414b7c9 DS |
1879 | if (r < 0) |
1880 | return r; | |
1881 | } | |
4ad49000 LP |
1882 | |
1883 | /* And then do the real work */ | |
17f14955 | 1884 | r = unit_create_cgroup(u, target_mask, enable_mask); |
6414b7c9 DS |
1885 | if (r < 0) |
1886 | return r; | |
1887 | ||
1888 | /* Finally, apply the necessary attributes. */ | |
17f14955 | 1889 | cgroup_context_apply(u, target_mask, state); |
4b58153d | 1890 | cgroup_xattr_apply(u); |
6414b7c9 | 1891 | |
c2baf11c LP |
1892 | /* Now, reset the invalidation mask */ |
1893 | u->cgroup_invalidated_mask = 0; | |
6414b7c9 | 1894 | return 0; |
64747e2d LP |
1895 | } |
1896 | ||
91a6073e | 1897 | unsigned manager_dispatch_cgroup_realize_queue(Manager *m) { |
db785129 | 1898 | ManagerState state; |
4ad49000 | 1899 | unsigned n = 0; |
db785129 | 1900 | Unit *i; |
6414b7c9 | 1901 | int r; |
ecedd90f | 1902 | |
91a6073e LP |
1903 | assert(m); |
1904 | ||
db785129 LP |
1905 | state = manager_state(m); |
1906 | ||
91a6073e LP |
1907 | while ((i = m->cgroup_realize_queue)) { |
1908 | assert(i->in_cgroup_realize_queue); | |
ecedd90f | 1909 | |
2aa57a65 LP |
1910 | if (UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(i))) { |
1911 | /* Maybe things changed, and the unit is not actually active anymore? */ | |
1912 | unit_remove_from_cgroup_realize_queue(i); | |
1913 | continue; | |
1914 | } | |
1915 | ||
db785129 | 1916 | r = unit_realize_cgroup_now(i, state); |
6414b7c9 | 1917 | if (r < 0) |
efdb0237 | 1918 | log_warning_errno(r, "Failed to realize cgroups for queued unit %s, ignoring: %m", i->id); |
0a1eb06d | 1919 | |
4ad49000 LP |
1920 | n++; |
1921 | } | |
ecedd90f | 1922 | |
4ad49000 | 1923 | return n; |
8e274523 LP |
1924 | } |
1925 | ||
91a6073e | 1926 | static void unit_add_siblings_to_cgroup_realize_queue(Unit *u) { |
4ad49000 | 1927 | Unit *slice; |
ca949c9d | 1928 | |
4ad49000 LP |
1929 | /* This adds the siblings of the specified unit and the |
1930 | * siblings of all parent units to the cgroup queue. (But | |
1931 | * neither the specified unit itself nor the parents.) */ | |
1932 | ||
1933 | while ((slice = UNIT_DEREF(u->slice))) { | |
1934 | Iterator i; | |
1935 | Unit *m; | |
eef85c4a | 1936 | void *v; |
8f53a7b8 | 1937 | |
eef85c4a | 1938 | HASHMAP_FOREACH_KEY(v, m, u->dependencies[UNIT_BEFORE], i) { |
4ad49000 LP |
1939 | if (m == u) |
1940 | continue; | |
8e274523 | 1941 | |
6414b7c9 DS |
1942 | /* Skip units that have a dependency on the slice |
1943 | * but aren't actually in it. */ | |
4ad49000 | 1944 | if (UNIT_DEREF(m->slice) != slice) |
50159e6a | 1945 | continue; |
8e274523 | 1946 | |
6414b7c9 DS |
1947 | /* No point in doing cgroup application for units |
1948 | * without active processes. */ | |
1949 | if (UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(m))) | |
1950 | continue; | |
1951 | ||
1952 | /* If the unit doesn't need any new controllers | |
1953 | * and has current ones realized, it doesn't need | |
1954 | * any changes. */ | |
906c06f6 DM |
1955 | if (unit_has_mask_realized(m, |
1956 | unit_get_target_mask(m), | |
17f14955 | 1957 | unit_get_enable_mask(m))) |
6414b7c9 DS |
1958 | continue; |
1959 | ||
91a6073e | 1960 | unit_add_to_cgroup_realize_queue(m); |
50159e6a LP |
1961 | } |
1962 | ||
4ad49000 | 1963 | u = slice; |
8e274523 | 1964 | } |
4ad49000 LP |
1965 | } |
1966 | ||
0a1eb06d | 1967 | int unit_realize_cgroup(Unit *u) { |
4ad49000 LP |
1968 | assert(u); |
1969 | ||
35b7ff80 | 1970 | if (!UNIT_HAS_CGROUP_CONTEXT(u)) |
0a1eb06d | 1971 | return 0; |
8e274523 | 1972 | |
4ad49000 LP |
1973 | /* So, here's the deal: when realizing the cgroups for this |
1974 | * unit, we need to first create all parents, but there's more | |
1975 | * actually: for the weight-based controllers we also need to | |
1976 | * make sure that all our siblings (i.e. units that are in the | |
73e231ab | 1977 | * same slice as we are) have cgroups, too. Otherwise, things |
4ad49000 LP |
1978 | * would become very uneven as each of their processes would |
1979 | * get as much resources as all our group together. This call | |
1980 | * will synchronously create the parent cgroups, but will | |
1981 | * defer work on the siblings to the next event loop | |
1982 | * iteration. */ | |
ca949c9d | 1983 | |
4ad49000 | 1984 | /* Add all sibling slices to the cgroup queue. */ |
91a6073e | 1985 | unit_add_siblings_to_cgroup_realize_queue(u); |
4ad49000 | 1986 | |
6414b7c9 | 1987 | /* And realize this one now (and apply the values) */ |
db785129 | 1988 | return unit_realize_cgroup_now(u, manager_state(u->manager)); |
8e274523 LP |
1989 | } |
1990 | ||
efdb0237 LP |
1991 | void unit_release_cgroup(Unit *u) { |
1992 | assert(u); | |
1993 | ||
8a0d5388 LP |
1994 | /* Forgets all cgroup details for this cgroup — but does *not* destroy the cgroup. This is hence OK to call |
1995 | * when we close down everything for reexecution, where we really want to leave the cgroup in place. */ | |
efdb0237 LP |
1996 | |
1997 | if (u->cgroup_path) { | |
1998 | (void) hashmap_remove(u->manager->cgroup_unit, u->cgroup_path); | |
1999 | u->cgroup_path = mfree(u->cgroup_path); | |
2000 | } | |
2001 | ||
2002 | if (u->cgroup_inotify_wd >= 0) { | |
2003 | if (inotify_rm_watch(u->manager->cgroup_inotify_fd, u->cgroup_inotify_wd) < 0) | |
5e1ee764 | 2004 | log_unit_debug_errno(u, errno, "Failed to remove cgroup inotify watch %i for %s, ignoring: %m", u->cgroup_inotify_wd, u->id); |
efdb0237 LP |
2005 | |
2006 | (void) hashmap_remove(u->manager->cgroup_inotify_wd_unit, INT_TO_PTR(u->cgroup_inotify_wd)); | |
2007 | u->cgroup_inotify_wd = -1; | |
2008 | } | |
2009 | } | |
2010 | ||
2011 | void unit_prune_cgroup(Unit *u) { | |
8e274523 | 2012 | int r; |
efdb0237 | 2013 | bool is_root_slice; |
8e274523 | 2014 | |
4ad49000 | 2015 | assert(u); |
8e274523 | 2016 | |
efdb0237 LP |
2017 | /* Removes the cgroup, if empty and possible, and stops watching it. */ |
2018 | ||
4ad49000 LP |
2019 | if (!u->cgroup_path) |
2020 | return; | |
8e274523 | 2021 | |
fe700f46 LP |
2022 | (void) unit_get_cpu_usage(u, NULL); /* Cache the last CPU usage value before we destroy the cgroup */ |
2023 | ||
efdb0237 LP |
2024 | is_root_slice = unit_has_name(u, SPECIAL_ROOT_SLICE); |
2025 | ||
2026 | r = cg_trim_everywhere(u->manager->cgroup_supported, u->cgroup_path, !is_root_slice); | |
dab5bf85 | 2027 | if (r < 0) { |
f29ff115 | 2028 | log_unit_debug_errno(u, r, "Failed to destroy cgroup %s, ignoring: %m", u->cgroup_path); |
dab5bf85 RL |
2029 | return; |
2030 | } | |
8e274523 | 2031 | |
efdb0237 LP |
2032 | if (is_root_slice) |
2033 | return; | |
2034 | ||
2035 | unit_release_cgroup(u); | |
0a1eb06d | 2036 | |
4ad49000 | 2037 | u->cgroup_realized = false; |
bc432dc7 | 2038 | u->cgroup_realized_mask = 0; |
ccf78df1 | 2039 | u->cgroup_enabled_mask = 0; |
084c7007 RG |
2040 | |
2041 | u->bpf_device_control_installed = bpf_program_unref(u->bpf_device_control_installed); | |
8e274523 LP |
2042 | } |
2043 | ||
efdb0237 | 2044 | int unit_search_main_pid(Unit *u, pid_t *ret) { |
4ad49000 LP |
2045 | _cleanup_fclose_ FILE *f = NULL; |
2046 | pid_t pid = 0, npid, mypid; | |
efdb0237 | 2047 | int r; |
4ad49000 LP |
2048 | |
2049 | assert(u); | |
efdb0237 | 2050 | assert(ret); |
4ad49000 LP |
2051 | |
2052 | if (!u->cgroup_path) | |
efdb0237 | 2053 | return -ENXIO; |
4ad49000 | 2054 | |
efdb0237 LP |
2055 | r = cg_enumerate_processes(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, &f); |
2056 | if (r < 0) | |
2057 | return r; | |
4ad49000 | 2058 | |
df0ff127 | 2059 | mypid = getpid_cached(); |
4ad49000 LP |
2060 | while (cg_read_pid(f, &npid) > 0) { |
2061 | pid_t ppid; | |
2062 | ||
2063 | if (npid == pid) | |
2064 | continue; | |
8e274523 | 2065 | |
4ad49000 | 2066 | /* Ignore processes that aren't our kids */ |
6bc73acb | 2067 | if (get_process_ppid(npid, &ppid) >= 0 && ppid != mypid) |
4ad49000 | 2068 | continue; |
8e274523 | 2069 | |
efdb0237 | 2070 | if (pid != 0) |
4ad49000 LP |
2071 | /* Dang, there's more than one daemonized PID |
2072 | in this group, so we don't know what process | |
2073 | is the main process. */ | |
efdb0237 LP |
2074 | |
2075 | return -ENODATA; | |
8e274523 | 2076 | |
4ad49000 | 2077 | pid = npid; |
8e274523 LP |
2078 | } |
2079 | ||
efdb0237 LP |
2080 | *ret = pid; |
2081 | return 0; | |
2082 | } | |
2083 | ||
2084 | static int unit_watch_pids_in_path(Unit *u, const char *path) { | |
b3c5bad3 | 2085 | _cleanup_closedir_ DIR *d = NULL; |
efdb0237 LP |
2086 | _cleanup_fclose_ FILE *f = NULL; |
2087 | int ret = 0, r; | |
2088 | ||
2089 | assert(u); | |
2090 | assert(path); | |
2091 | ||
2092 | r = cg_enumerate_processes(SYSTEMD_CGROUP_CONTROLLER, path, &f); | |
2093 | if (r < 0) | |
2094 | ret = r; | |
2095 | else { | |
2096 | pid_t pid; | |
2097 | ||
2098 | while ((r = cg_read_pid(f, &pid)) > 0) { | |
2099 | r = unit_watch_pid(u, pid); | |
2100 | if (r < 0 && ret >= 0) | |
2101 | ret = r; | |
2102 | } | |
2103 | ||
2104 | if (r < 0 && ret >= 0) | |
2105 | ret = r; | |
2106 | } | |
2107 | ||
2108 | r = cg_enumerate_subgroups(SYSTEMD_CGROUP_CONTROLLER, path, &d); | |
2109 | if (r < 0) { | |
2110 | if (ret >= 0) | |
2111 | ret = r; | |
2112 | } else { | |
2113 | char *fn; | |
2114 | ||
2115 | while ((r = cg_read_subgroup(d, &fn)) > 0) { | |
2116 | _cleanup_free_ char *p = NULL; | |
2117 | ||
605405c6 | 2118 | p = strjoin(path, "/", fn); |
efdb0237 LP |
2119 | free(fn); |
2120 | ||
2121 | if (!p) | |
2122 | return -ENOMEM; | |
2123 | ||
2124 | r = unit_watch_pids_in_path(u, p); | |
2125 | if (r < 0 && ret >= 0) | |
2126 | ret = r; | |
2127 | } | |
2128 | ||
2129 | if (r < 0 && ret >= 0) | |
2130 | ret = r; | |
2131 | } | |
2132 | ||
2133 | return ret; | |
2134 | } | |
2135 | ||
11aef522 LP |
2136 | int unit_synthesize_cgroup_empty_event(Unit *u) { |
2137 | int r; | |
2138 | ||
2139 | assert(u); | |
2140 | ||
2141 | /* Enqueue a synthetic cgroup empty event if this unit doesn't watch any PIDs anymore. This is compatibility | |
2142 | * support for non-unified systems where notifications aren't reliable, and hence need to take whatever we can | |
2143 | * get as notification source as soon as we stopped having any useful PIDs to watch for. */ | |
2144 | ||
2145 | if (!u->cgroup_path) | |
2146 | return -ENOENT; | |
2147 | ||
2148 | r = cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER); | |
2149 | if (r < 0) | |
2150 | return r; | |
2151 | if (r > 0) /* On unified we have reliable notifications, and don't need this */ | |
2152 | return 0; | |
2153 | ||
2154 | if (!set_isempty(u->pids)) | |
2155 | return 0; | |
2156 | ||
2157 | unit_add_to_cgroup_empty_queue(u); | |
2158 | return 0; | |
2159 | } | |
2160 | ||
efdb0237 | 2161 | int unit_watch_all_pids(Unit *u) { |
b4cccbc1 LP |
2162 | int r; |
2163 | ||
efdb0237 LP |
2164 | assert(u); |
2165 | ||
2166 | /* Adds all PIDs from our cgroup to the set of PIDs we | |
2167 | * watch. This is a fallback logic for cases where we do not | |
2168 | * get reliable cgroup empty notifications: we try to use | |
2169 | * SIGCHLD as replacement. */ | |
2170 | ||
2171 | if (!u->cgroup_path) | |
2172 | return -ENOENT; | |
2173 | ||
c22800e4 | 2174 | r = cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER); |
b4cccbc1 LP |
2175 | if (r < 0) |
2176 | return r; | |
2177 | if (r > 0) /* On unified we can use proper notifications */ | |
efdb0237 LP |
2178 | return 0; |
2179 | ||
2180 | return unit_watch_pids_in_path(u, u->cgroup_path); | |
2181 | } | |
2182 | ||
09e24654 LP |
2183 | static int on_cgroup_empty_event(sd_event_source *s, void *userdata) { |
2184 | Manager *m = userdata; | |
2185 | Unit *u; | |
efdb0237 LP |
2186 | int r; |
2187 | ||
09e24654 LP |
2188 | assert(s); |
2189 | assert(m); | |
efdb0237 | 2190 | |
09e24654 LP |
2191 | u = m->cgroup_empty_queue; |
2192 | if (!u) | |
efdb0237 LP |
2193 | return 0; |
2194 | ||
09e24654 LP |
2195 | assert(u->in_cgroup_empty_queue); |
2196 | u->in_cgroup_empty_queue = false; | |
2197 | LIST_REMOVE(cgroup_empty_queue, m->cgroup_empty_queue, u); | |
2198 | ||
2199 | if (m->cgroup_empty_queue) { | |
2200 | /* More stuff queued, let's make sure we remain enabled */ | |
2201 | r = sd_event_source_set_enabled(s, SD_EVENT_ONESHOT); | |
2202 | if (r < 0) | |
19a691a9 | 2203 | log_debug_errno(r, "Failed to reenable cgroup empty event source, ignoring: %m"); |
09e24654 | 2204 | } |
efdb0237 LP |
2205 | |
2206 | unit_add_to_gc_queue(u); | |
2207 | ||
2208 | if (UNIT_VTABLE(u)->notify_cgroup_empty) | |
2209 | UNIT_VTABLE(u)->notify_cgroup_empty(u); | |
2210 | ||
2211 | return 0; | |
2212 | } | |
2213 | ||
09e24654 LP |
2214 | void unit_add_to_cgroup_empty_queue(Unit *u) { |
2215 | int r; | |
2216 | ||
2217 | assert(u); | |
2218 | ||
2219 | /* Note that there are four different ways how cgroup empty events reach us: | |
2220 | * | |
2221 | * 1. On the unified hierarchy we get an inotify event on the cgroup | |
2222 | * | |
2223 | * 2. On the legacy hierarchy, when running in system mode, we get a datagram on the cgroup agent socket | |
2224 | * | |
2225 | * 3. On the legacy hierarchy, when running in user mode, we get a D-Bus signal on the system bus | |
2226 | * | |
2227 | * 4. On the legacy hierarchy, in service units we start watching all processes of the cgroup for SIGCHLD as | |
2228 | * soon as we get one SIGCHLD, to deal with unreliable cgroup notifications. | |
2229 | * | |
2230 | * Regardless which way we got the notification, we'll verify it here, and then add it to a separate | |
2231 | * queue. This queue will be dispatched at a lower priority than the SIGCHLD handler, so that we always use | |
2232 | * SIGCHLD if we can get it first, and only use the cgroup empty notifications if there's no SIGCHLD pending | |
2233 | * (which might happen if the cgroup doesn't contain processes that are our own child, which is typically the | |
2234 | * case for scope units). */ | |
2235 | ||
2236 | if (u->in_cgroup_empty_queue) | |
2237 | return; | |
2238 | ||
2239 | /* Let's verify that the cgroup is really empty */ | |
2240 | if (!u->cgroup_path) | |
2241 | return; | |
2242 | r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path); | |
2243 | if (r < 0) { | |
2244 | log_unit_debug_errno(u, r, "Failed to determine whether cgroup %s is empty: %m", u->cgroup_path); | |
2245 | return; | |
2246 | } | |
2247 | if (r == 0) | |
2248 | return; | |
2249 | ||
2250 | LIST_PREPEND(cgroup_empty_queue, u->manager->cgroup_empty_queue, u); | |
2251 | u->in_cgroup_empty_queue = true; | |
2252 | ||
2253 | /* Trigger the defer event */ | |
2254 | r = sd_event_source_set_enabled(u->manager->cgroup_empty_event_source, SD_EVENT_ONESHOT); | |
2255 | if (r < 0) | |
2256 | log_debug_errno(r, "Failed to enable cgroup empty event source: %m"); | |
2257 | } | |
2258 | ||
efdb0237 LP |
2259 | static int on_cgroup_inotify_event(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
2260 | Manager *m = userdata; | |
2261 | ||
2262 | assert(s); | |
2263 | assert(fd >= 0); | |
2264 | assert(m); | |
2265 | ||
2266 | for (;;) { | |
2267 | union inotify_event_buffer buffer; | |
2268 | struct inotify_event *e; | |
2269 | ssize_t l; | |
2270 | ||
2271 | l = read(fd, &buffer, sizeof(buffer)); | |
2272 | if (l < 0) { | |
47249640 | 2273 | if (IN_SET(errno, EINTR, EAGAIN)) |
efdb0237 LP |
2274 | return 0; |
2275 | ||
2276 | return log_error_errno(errno, "Failed to read control group inotify events: %m"); | |
2277 | } | |
2278 | ||
2279 | FOREACH_INOTIFY_EVENT(e, buffer, l) { | |
2280 | Unit *u; | |
2281 | ||
2282 | if (e->wd < 0) | |
2283 | /* Queue overflow has no watch descriptor */ | |
2284 | continue; | |
2285 | ||
2286 | if (e->mask & IN_IGNORED) | |
2287 | /* The watch was just removed */ | |
2288 | continue; | |
2289 | ||
2290 | u = hashmap_get(m->cgroup_inotify_wd_unit, INT_TO_PTR(e->wd)); | |
2291 | if (!u) /* Not that inotify might deliver | |
2292 | * events for a watch even after it | |
2293 | * was removed, because it was queued | |
2294 | * before the removal. Let's ignore | |
2295 | * this here safely. */ | |
2296 | continue; | |
2297 | ||
09e24654 | 2298 | unit_add_to_cgroup_empty_queue(u); |
efdb0237 LP |
2299 | } |
2300 | } | |
8e274523 LP |
2301 | } |
2302 | ||
17f14955 RG |
2303 | static int cg_bpf_mask_supported(CGroupMask *ret) { |
2304 | CGroupMask mask = 0; | |
2305 | int r; | |
2306 | ||
2307 | /* BPF-based firewall */ | |
2308 | r = bpf_firewall_supported(); | |
2309 | if (r > 0) | |
2310 | mask |= CGROUP_MASK_BPF_FIREWALL; | |
2311 | ||
084c7007 RG |
2312 | /* BPF-based device access control */ |
2313 | r = bpf_devices_supported(); | |
2314 | if (r > 0) | |
2315 | mask |= CGROUP_MASK_BPF_DEVICES; | |
2316 | ||
17f14955 RG |
2317 | *ret = mask; |
2318 | return 0; | |
2319 | } | |
2320 | ||
8e274523 | 2321 | int manager_setup_cgroup(Manager *m) { |
9444b1f2 | 2322 | _cleanup_free_ char *path = NULL; |
10bd3e2e | 2323 | const char *scope_path; |
efdb0237 | 2324 | CGroupController c; |
b4cccbc1 | 2325 | int r, all_unified; |
17f14955 | 2326 | CGroupMask mask; |
efdb0237 | 2327 | char *e; |
8e274523 LP |
2328 | |
2329 | assert(m); | |
2330 | ||
35d2e7ec | 2331 | /* 1. Determine hierarchy */ |
efdb0237 | 2332 | m->cgroup_root = mfree(m->cgroup_root); |
9444b1f2 | 2333 | r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 0, &m->cgroup_root); |
23bbb0de MS |
2334 | if (r < 0) |
2335 | return log_error_errno(r, "Cannot determine cgroup we are running in: %m"); | |
8e274523 | 2336 | |
efdb0237 LP |
2337 | /* Chop off the init scope, if we are already located in it */ |
2338 | e = endswith(m->cgroup_root, "/" SPECIAL_INIT_SCOPE); | |
0d8c31ff | 2339 | |
efdb0237 LP |
2340 | /* LEGACY: Also chop off the system slice if we are in |
2341 | * it. This is to support live upgrades from older systemd | |
2342 | * versions where PID 1 was moved there. Also see | |
2343 | * cg_get_root_path(). */ | |
463d0d15 | 2344 | if (!e && MANAGER_IS_SYSTEM(m)) { |
9444b1f2 | 2345 | e = endswith(m->cgroup_root, "/" SPECIAL_SYSTEM_SLICE); |
15c60e99 | 2346 | if (!e) |
efdb0237 | 2347 | e = endswith(m->cgroup_root, "/system"); /* even more legacy */ |
0baf24dd | 2348 | } |
efdb0237 LP |
2349 | if (e) |
2350 | *e = 0; | |
7ccfb64a | 2351 | |
7546145e LP |
2352 | /* And make sure to store away the root value without trailing slash, even for the root dir, so that we can |
2353 | * easily prepend it everywhere. */ | |
2354 | delete_trailing_chars(m->cgroup_root, "/"); | |
8e274523 | 2355 | |
35d2e7ec | 2356 | /* 2. Show data */ |
9444b1f2 | 2357 | r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, NULL, &path); |
23bbb0de MS |
2358 | if (r < 0) |
2359 | return log_error_errno(r, "Cannot find cgroup mount point: %m"); | |
8e274523 | 2360 | |
415fc41c TH |
2361 | r = cg_unified_flush(); |
2362 | if (r < 0) | |
2363 | return log_error_errno(r, "Couldn't determine if we are running in the unified hierarchy: %m"); | |
5da38d07 | 2364 | |
b4cccbc1 | 2365 | all_unified = cg_all_unified(); |
d4c819ed ZJS |
2366 | if (all_unified < 0) |
2367 | return log_error_errno(all_unified, "Couldn't determine whether we are in all unified mode: %m"); | |
2368 | if (all_unified > 0) | |
efdb0237 | 2369 | log_debug("Unified cgroup hierarchy is located at %s.", path); |
b4cccbc1 | 2370 | else { |
c22800e4 | 2371 | r = cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER); |
b4cccbc1 LP |
2372 | if (r < 0) |
2373 | return log_error_errno(r, "Failed to determine whether systemd's own controller is in unified mode: %m"); | |
2374 | if (r > 0) | |
2375 | log_debug("Unified cgroup hierarchy is located at %s. Controllers are on legacy hierarchies.", path); | |
2376 | else | |
2377 | log_debug("Using cgroup controller " SYSTEMD_CGROUP_CONTROLLER_LEGACY ". File system hierarchy is at %s.", path); | |
2378 | } | |
efdb0237 | 2379 | |
09e24654 LP |
2380 | /* 3. Allocate cgroup empty defer event source */ |
2381 | m->cgroup_empty_event_source = sd_event_source_unref(m->cgroup_empty_event_source); | |
2382 | r = sd_event_add_defer(m->event, &m->cgroup_empty_event_source, on_cgroup_empty_event, m); | |
2383 | if (r < 0) | |
2384 | return log_error_errno(r, "Failed to create cgroup empty event source: %m"); | |
2385 | ||
2386 | r = sd_event_source_set_priority(m->cgroup_empty_event_source, SD_EVENT_PRIORITY_NORMAL-5); | |
2387 | if (r < 0) | |
2388 | return log_error_errno(r, "Failed to set priority of cgroup empty event source: %m"); | |
2389 | ||
2390 | r = sd_event_source_set_enabled(m->cgroup_empty_event_source, SD_EVENT_OFF); | |
2391 | if (r < 0) | |
2392 | return log_error_errno(r, "Failed to disable cgroup empty event source: %m"); | |
2393 | ||
2394 | (void) sd_event_source_set_description(m->cgroup_empty_event_source, "cgroup-empty"); | |
2395 | ||
2396 | /* 4. Install notifier inotify object, or agent */ | |
10bd3e2e | 2397 | if (cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER) > 0) { |
c6c18be3 | 2398 | |
09e24654 | 2399 | /* In the unified hierarchy we can get cgroup empty notifications via inotify. */ |
efdb0237 | 2400 | |
10bd3e2e LP |
2401 | m->cgroup_inotify_event_source = sd_event_source_unref(m->cgroup_inotify_event_source); |
2402 | safe_close(m->cgroup_inotify_fd); | |
efdb0237 | 2403 | |
10bd3e2e LP |
2404 | m->cgroup_inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC); |
2405 | if (m->cgroup_inotify_fd < 0) | |
2406 | return log_error_errno(errno, "Failed to create control group inotify object: %m"); | |
efdb0237 | 2407 | |
10bd3e2e LP |
2408 | r = sd_event_add_io(m->event, &m->cgroup_inotify_event_source, m->cgroup_inotify_fd, EPOLLIN, on_cgroup_inotify_event, m); |
2409 | if (r < 0) | |
2410 | return log_error_errno(r, "Failed to watch control group inotify object: %m"); | |
efdb0237 | 2411 | |
10bd3e2e LP |
2412 | /* Process cgroup empty notifications early, but after service notifications and SIGCHLD. Also |
2413 | * see handling of cgroup agent notifications, for the classic cgroup hierarchy support. */ | |
09e24654 | 2414 | r = sd_event_source_set_priority(m->cgroup_inotify_event_source, SD_EVENT_PRIORITY_NORMAL-4); |
10bd3e2e LP |
2415 | if (r < 0) |
2416 | return log_error_errno(r, "Failed to set priority of inotify event source: %m"); | |
efdb0237 | 2417 | |
10bd3e2e | 2418 | (void) sd_event_source_set_description(m->cgroup_inotify_event_source, "cgroup-inotify"); |
efdb0237 | 2419 | |
611c4f8a | 2420 | } else if (MANAGER_IS_SYSTEM(m) && manager_owns_host_root_cgroup(m) && !MANAGER_IS_TEST_RUN(m)) { |
efdb0237 | 2421 | |
10bd3e2e LP |
2422 | /* On the legacy hierarchy we only get notifications via cgroup agents. (Which isn't really reliable, |
2423 | * since it does not generate events when control groups with children run empty. */ | |
8e274523 | 2424 | |
10bd3e2e | 2425 | r = cg_install_release_agent(SYSTEMD_CGROUP_CONTROLLER, SYSTEMD_CGROUP_AGENT_PATH); |
23bbb0de | 2426 | if (r < 0) |
10bd3e2e LP |
2427 | log_warning_errno(r, "Failed to install release agent, ignoring: %m"); |
2428 | else if (r > 0) | |
2429 | log_debug("Installed release agent."); | |
2430 | else if (r == 0) | |
2431 | log_debug("Release agent already installed."); | |
2432 | } | |
efdb0237 | 2433 | |
09e24654 | 2434 | /* 5. Make sure we are in the special "init.scope" unit in the root slice. */ |
10bd3e2e LP |
2435 | scope_path = strjoina(m->cgroup_root, "/" SPECIAL_INIT_SCOPE); |
2436 | r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, scope_path, 0); | |
aa77e234 MS |
2437 | if (r >= 0) { |
2438 | /* Also, move all other userspace processes remaining in the root cgroup into that scope. */ | |
2439 | r = cg_migrate(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, SYSTEMD_CGROUP_CONTROLLER, scope_path, 0); | |
2440 | if (r < 0) | |
2441 | log_warning_errno(r, "Couldn't move remaining userspace processes, ignoring: %m"); | |
c6c18be3 | 2442 | |
aa77e234 MS |
2443 | /* 6. And pin it, so that it cannot be unmounted */ |
2444 | safe_close(m->pin_cgroupfs_fd); | |
2445 | m->pin_cgroupfs_fd = open(path, O_RDONLY|O_CLOEXEC|O_DIRECTORY|O_NOCTTY|O_NONBLOCK); | |
2446 | if (m->pin_cgroupfs_fd < 0) | |
2447 | return log_error_errno(errno, "Failed to open pin file: %m"); | |
0d8c31ff | 2448 | |
638cece4 | 2449 | } else if (!MANAGER_IS_TEST_RUN(m)) |
aa77e234 | 2450 | return log_error_errno(r, "Failed to create %s control group: %m", scope_path); |
10bd3e2e | 2451 | |
09e24654 | 2452 | /* 7. Always enable hierarchical support if it exists... */ |
638cece4 | 2453 | if (!all_unified && !MANAGER_IS_TEST_RUN(m)) |
10bd3e2e | 2454 | (void) cg_set_attribute("memory", "/", "memory.use_hierarchy", "1"); |
c6c18be3 | 2455 | |
17f14955 | 2456 | /* 8. Figure out which controllers are supported */ |
efdb0237 LP |
2457 | r = cg_mask_supported(&m->cgroup_supported); |
2458 | if (r < 0) | |
2459 | return log_error_errno(r, "Failed to determine supported controllers: %m"); | |
17f14955 RG |
2460 | |
2461 | /* 9. Figure out which bpf-based pseudo-controllers are supported */ | |
2462 | r = cg_bpf_mask_supported(&mask); | |
2463 | if (r < 0) | |
2464 | return log_error_errno(r, "Failed to determine supported bpf-based pseudo-controllers: %m"); | |
2465 | m->cgroup_supported |= mask; | |
2466 | ||
2467 | /* 10. Log which controllers are supported */ | |
efdb0237 | 2468 | for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) |
eee0a1e4 | 2469 | log_debug("Controller '%s' supported: %s", cgroup_controller_to_string(c), yes_no(m->cgroup_supported & CGROUP_CONTROLLER_TO_MASK(c))); |
9156e799 | 2470 | |
a32360f1 | 2471 | return 0; |
8e274523 LP |
2472 | } |
2473 | ||
c6c18be3 | 2474 | void manager_shutdown_cgroup(Manager *m, bool delete) { |
8e274523 LP |
2475 | assert(m); |
2476 | ||
9444b1f2 LP |
2477 | /* We can't really delete the group, since we are in it. But |
2478 | * let's trim it. */ | |
f6c63f6f | 2479 | if (delete && m->cgroup_root && m->test_run_flags != MANAGER_TEST_RUN_MINIMAL) |
efdb0237 LP |
2480 | (void) cg_trim(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, false); |
2481 | ||
09e24654 LP |
2482 | m->cgroup_empty_event_source = sd_event_source_unref(m->cgroup_empty_event_source); |
2483 | ||
efdb0237 LP |
2484 | m->cgroup_inotify_wd_unit = hashmap_free(m->cgroup_inotify_wd_unit); |
2485 | ||
2486 | m->cgroup_inotify_event_source = sd_event_source_unref(m->cgroup_inotify_event_source); | |
2487 | m->cgroup_inotify_fd = safe_close(m->cgroup_inotify_fd); | |
8e274523 | 2488 | |
03e334a1 | 2489 | m->pin_cgroupfs_fd = safe_close(m->pin_cgroupfs_fd); |
c6c18be3 | 2490 | |
efdb0237 | 2491 | m->cgroup_root = mfree(m->cgroup_root); |
8e274523 LP |
2492 | } |
2493 | ||
4ad49000 | 2494 | Unit* manager_get_unit_by_cgroup(Manager *m, const char *cgroup) { |
acb14d31 | 2495 | char *p; |
4ad49000 | 2496 | Unit *u; |
acb14d31 LP |
2497 | |
2498 | assert(m); | |
2499 | assert(cgroup); | |
acb14d31 | 2500 | |
4ad49000 LP |
2501 | u = hashmap_get(m->cgroup_unit, cgroup); |
2502 | if (u) | |
2503 | return u; | |
acb14d31 | 2504 | |
8e70580b | 2505 | p = strdupa(cgroup); |
acb14d31 LP |
2506 | for (;;) { |
2507 | char *e; | |
2508 | ||
2509 | e = strrchr(p, '/'); | |
efdb0237 LP |
2510 | if (!e || e == p) |
2511 | return hashmap_get(m->cgroup_unit, SPECIAL_ROOT_SLICE); | |
acb14d31 LP |
2512 | |
2513 | *e = 0; | |
2514 | ||
4ad49000 LP |
2515 | u = hashmap_get(m->cgroup_unit, p); |
2516 | if (u) | |
2517 | return u; | |
acb14d31 LP |
2518 | } |
2519 | } | |
2520 | ||
b3ac818b | 2521 | Unit *manager_get_unit_by_pid_cgroup(Manager *m, pid_t pid) { |
4ad49000 | 2522 | _cleanup_free_ char *cgroup = NULL; |
8e274523 | 2523 | |
8c47c732 LP |
2524 | assert(m); |
2525 | ||
62a76913 | 2526 | if (!pid_is_valid(pid)) |
b3ac818b LP |
2527 | return NULL; |
2528 | ||
62a76913 | 2529 | if (cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, pid, &cgroup) < 0) |
b3ac818b LP |
2530 | return NULL; |
2531 | ||
2532 | return manager_get_unit_by_cgroup(m, cgroup); | |
2533 | } | |
2534 | ||
2535 | Unit *manager_get_unit_by_pid(Manager *m, pid_t pid) { | |
62a76913 | 2536 | Unit *u, **array; |
b3ac818b LP |
2537 | |
2538 | assert(m); | |
2539 | ||
62a76913 LP |
2540 | /* Note that a process might be owned by multiple units, we return only one here, which is good enough for most |
2541 | * cases, though not strictly correct. We prefer the one reported by cgroup membership, as that's the most | |
2542 | * relevant one as children of the process will be assigned to that one, too, before all else. */ | |
2543 | ||
2544 | if (!pid_is_valid(pid)) | |
8c47c732 LP |
2545 | return NULL; |
2546 | ||
2ca9d979 | 2547 | if (pid == getpid_cached()) |
efdb0237 LP |
2548 | return hashmap_get(m->units, SPECIAL_INIT_SCOPE); |
2549 | ||
62a76913 | 2550 | u = manager_get_unit_by_pid_cgroup(m, pid); |
5fe8876b LP |
2551 | if (u) |
2552 | return u; | |
2553 | ||
62a76913 | 2554 | u = hashmap_get(m->watch_pids, PID_TO_PTR(pid)); |
5fe8876b LP |
2555 | if (u) |
2556 | return u; | |
2557 | ||
62a76913 LP |
2558 | array = hashmap_get(m->watch_pids, PID_TO_PTR(-pid)); |
2559 | if (array) | |
2560 | return array[0]; | |
2561 | ||
2562 | return NULL; | |
6dde1f33 | 2563 | } |
4fbf50b3 | 2564 | |
4ad49000 LP |
2565 | int manager_notify_cgroup_empty(Manager *m, const char *cgroup) { |
2566 | Unit *u; | |
4fbf50b3 | 2567 | |
4ad49000 LP |
2568 | assert(m); |
2569 | assert(cgroup); | |
4fbf50b3 | 2570 | |
09e24654 LP |
2571 | /* Called on the legacy hierarchy whenever we get an explicit cgroup notification from the cgroup agent process |
2572 | * or from the --system instance */ | |
2573 | ||
d8fdc620 LP |
2574 | log_debug("Got cgroup empty notification for: %s", cgroup); |
2575 | ||
4ad49000 | 2576 | u = manager_get_unit_by_cgroup(m, cgroup); |
5ad096b3 LP |
2577 | if (!u) |
2578 | return 0; | |
b56c28c3 | 2579 | |
09e24654 LP |
2580 | unit_add_to_cgroup_empty_queue(u); |
2581 | return 1; | |
5ad096b3 LP |
2582 | } |
2583 | ||
2584 | int unit_get_memory_current(Unit *u, uint64_t *ret) { | |
2585 | _cleanup_free_ char *v = NULL; | |
2586 | int r; | |
2587 | ||
2588 | assert(u); | |
2589 | assert(ret); | |
2590 | ||
2e4025c0 | 2591 | if (!UNIT_CGROUP_BOOL(u, memory_accounting)) |
cf3b4be1 LP |
2592 | return -ENODATA; |
2593 | ||
5ad096b3 LP |
2594 | if (!u->cgroup_path) |
2595 | return -ENODATA; | |
2596 | ||
1f73aa00 | 2597 | /* The root cgroup doesn't expose this information, let's get it from /proc instead */ |
611c4f8a | 2598 | if (unit_has_host_root_cgroup(u)) |
1f73aa00 LP |
2599 | return procfs_memory_get_current(ret); |
2600 | ||
efdb0237 | 2601 | if ((u->cgroup_realized_mask & CGROUP_MASK_MEMORY) == 0) |
5ad096b3 LP |
2602 | return -ENODATA; |
2603 | ||
b4cccbc1 LP |
2604 | r = cg_all_unified(); |
2605 | if (r < 0) | |
2606 | return r; | |
2607 | if (r > 0) | |
efdb0237 | 2608 | r = cg_get_attribute("memory", u->cgroup_path, "memory.current", &v); |
b4cccbc1 LP |
2609 | else |
2610 | r = cg_get_attribute("memory", u->cgroup_path, "memory.usage_in_bytes", &v); | |
5ad096b3 LP |
2611 | if (r == -ENOENT) |
2612 | return -ENODATA; | |
2613 | if (r < 0) | |
2614 | return r; | |
2615 | ||
2616 | return safe_atou64(v, ret); | |
2617 | } | |
2618 | ||
03a7b521 LP |
2619 | int unit_get_tasks_current(Unit *u, uint64_t *ret) { |
2620 | _cleanup_free_ char *v = NULL; | |
2621 | int r; | |
2622 | ||
2623 | assert(u); | |
2624 | assert(ret); | |
2625 | ||
2e4025c0 | 2626 | if (!UNIT_CGROUP_BOOL(u, tasks_accounting)) |
cf3b4be1 LP |
2627 | return -ENODATA; |
2628 | ||
03a7b521 LP |
2629 | if (!u->cgroup_path) |
2630 | return -ENODATA; | |
2631 | ||
c36a69f4 | 2632 | /* The root cgroup doesn't expose this information, let's get it from /proc instead */ |
611c4f8a | 2633 | if (unit_has_host_root_cgroup(u)) |
c36a69f4 LP |
2634 | return procfs_tasks_get_current(ret); |
2635 | ||
1f73aa00 LP |
2636 | if ((u->cgroup_realized_mask & CGROUP_MASK_PIDS) == 0) |
2637 | return -ENODATA; | |
2638 | ||
03a7b521 LP |
2639 | r = cg_get_attribute("pids", u->cgroup_path, "pids.current", &v); |
2640 | if (r == -ENOENT) | |
2641 | return -ENODATA; | |
2642 | if (r < 0) | |
2643 | return r; | |
2644 | ||
2645 | return safe_atou64(v, ret); | |
2646 | } | |
2647 | ||
5ad096b3 LP |
2648 | static int unit_get_cpu_usage_raw(Unit *u, nsec_t *ret) { |
2649 | _cleanup_free_ char *v = NULL; | |
2650 | uint64_t ns; | |
2651 | int r; | |
2652 | ||
2653 | assert(u); | |
2654 | assert(ret); | |
2655 | ||
2656 | if (!u->cgroup_path) | |
2657 | return -ENODATA; | |
2658 | ||
1f73aa00 | 2659 | /* The root cgroup doesn't expose this information, let's get it from /proc instead */ |
611c4f8a | 2660 | if (unit_has_host_root_cgroup(u)) |
1f73aa00 LP |
2661 | return procfs_cpu_get_usage(ret); |
2662 | ||
b4cccbc1 LP |
2663 | r = cg_all_unified(); |
2664 | if (r < 0) | |
2665 | return r; | |
f98c2585 CD |
2666 | |
2667 | /* Requisite controllers for CPU accounting are not enabled */ | |
2668 | if ((get_cpu_accounting_mask() & ~u->cgroup_realized_mask) != 0) | |
2669 | return -ENODATA; | |
2670 | ||
b4cccbc1 | 2671 | if (r > 0) { |
66ebf6c0 TH |
2672 | _cleanup_free_ char *val = NULL; |
2673 | uint64_t us; | |
5ad096b3 | 2674 | |
b734a4ff | 2675 | r = cg_get_keyed_attribute("cpu", u->cgroup_path, "cpu.stat", STRV_MAKE("usage_usec"), &val); |
66ebf6c0 TH |
2676 | if (r < 0) |
2677 | return r; | |
b734a4ff LP |
2678 | if (IN_SET(r, -ENOENT, -ENXIO)) |
2679 | return -ENODATA; | |
66ebf6c0 TH |
2680 | |
2681 | r = safe_atou64(val, &us); | |
2682 | if (r < 0) | |
2683 | return r; | |
2684 | ||
2685 | ns = us * NSEC_PER_USEC; | |
2686 | } else { | |
66ebf6c0 TH |
2687 | r = cg_get_attribute("cpuacct", u->cgroup_path, "cpuacct.usage", &v); |
2688 | if (r == -ENOENT) | |
2689 | return -ENODATA; | |
2690 | if (r < 0) | |
2691 | return r; | |
2692 | ||
2693 | r = safe_atou64(v, &ns); | |
2694 | if (r < 0) | |
2695 | return r; | |
2696 | } | |
5ad096b3 LP |
2697 | |
2698 | *ret = ns; | |
2699 | return 0; | |
2700 | } | |
2701 | ||
2702 | int unit_get_cpu_usage(Unit *u, nsec_t *ret) { | |
2703 | nsec_t ns; | |
2704 | int r; | |
2705 | ||
fe700f46 LP |
2706 | assert(u); |
2707 | ||
2708 | /* Retrieve the current CPU usage counter. This will subtract the CPU counter taken when the unit was | |
2709 | * started. If the cgroup has been removed already, returns the last cached value. To cache the value, simply | |
2710 | * call this function with a NULL return value. */ | |
2711 | ||
2e4025c0 | 2712 | if (!UNIT_CGROUP_BOOL(u, cpu_accounting)) |
cf3b4be1 LP |
2713 | return -ENODATA; |
2714 | ||
5ad096b3 | 2715 | r = unit_get_cpu_usage_raw(u, &ns); |
fe700f46 LP |
2716 | if (r == -ENODATA && u->cpu_usage_last != NSEC_INFINITY) { |
2717 | /* If we can't get the CPU usage anymore (because the cgroup was already removed, for example), use our | |
2718 | * cached value. */ | |
2719 | ||
2720 | if (ret) | |
2721 | *ret = u->cpu_usage_last; | |
2722 | return 0; | |
2723 | } | |
5ad096b3 LP |
2724 | if (r < 0) |
2725 | return r; | |
2726 | ||
66ebf6c0 TH |
2727 | if (ns > u->cpu_usage_base) |
2728 | ns -= u->cpu_usage_base; | |
5ad096b3 LP |
2729 | else |
2730 | ns = 0; | |
2731 | ||
fe700f46 LP |
2732 | u->cpu_usage_last = ns; |
2733 | if (ret) | |
2734 | *ret = ns; | |
2735 | ||
5ad096b3 LP |
2736 | return 0; |
2737 | } | |
2738 | ||
906c06f6 DM |
2739 | int unit_get_ip_accounting( |
2740 | Unit *u, | |
2741 | CGroupIPAccountingMetric metric, | |
2742 | uint64_t *ret) { | |
2743 | ||
6b659ed8 | 2744 | uint64_t value; |
906c06f6 DM |
2745 | int fd, r; |
2746 | ||
2747 | assert(u); | |
2748 | assert(metric >= 0); | |
2749 | assert(metric < _CGROUP_IP_ACCOUNTING_METRIC_MAX); | |
2750 | assert(ret); | |
2751 | ||
2e4025c0 | 2752 | if (!UNIT_CGROUP_BOOL(u, ip_accounting)) |
cf3b4be1 LP |
2753 | return -ENODATA; |
2754 | ||
906c06f6 DM |
2755 | fd = IN_SET(metric, CGROUP_IP_INGRESS_BYTES, CGROUP_IP_INGRESS_PACKETS) ? |
2756 | u->ip_accounting_ingress_map_fd : | |
2757 | u->ip_accounting_egress_map_fd; | |
906c06f6 DM |
2758 | if (fd < 0) |
2759 | return -ENODATA; | |
2760 | ||
2761 | if (IN_SET(metric, CGROUP_IP_INGRESS_BYTES, CGROUP_IP_EGRESS_BYTES)) | |
6b659ed8 | 2762 | r = bpf_firewall_read_accounting(fd, &value, NULL); |
906c06f6 | 2763 | else |
6b659ed8 LP |
2764 | r = bpf_firewall_read_accounting(fd, NULL, &value); |
2765 | if (r < 0) | |
2766 | return r; | |
2767 | ||
2768 | /* Add in additional metrics from a previous runtime. Note that when reexecing/reloading the daemon we compile | |
2769 | * all BPF programs and maps anew, but serialize the old counters. When deserializing we store them in the | |
2770 | * ip_accounting_extra[] field, and add them in here transparently. */ | |
2771 | ||
2772 | *ret = value + u->ip_accounting_extra[metric]; | |
906c06f6 DM |
2773 | |
2774 | return r; | |
2775 | } | |
2776 | ||
2777 | int unit_reset_cpu_accounting(Unit *u) { | |
5ad096b3 LP |
2778 | nsec_t ns; |
2779 | int r; | |
2780 | ||
2781 | assert(u); | |
2782 | ||
fe700f46 LP |
2783 | u->cpu_usage_last = NSEC_INFINITY; |
2784 | ||
5ad096b3 LP |
2785 | r = unit_get_cpu_usage_raw(u, &ns); |
2786 | if (r < 0) { | |
66ebf6c0 | 2787 | u->cpu_usage_base = 0; |
5ad096b3 | 2788 | return r; |
b56c28c3 | 2789 | } |
2633eb83 | 2790 | |
66ebf6c0 | 2791 | u->cpu_usage_base = ns; |
4ad49000 | 2792 | return 0; |
4fbf50b3 LP |
2793 | } |
2794 | ||
906c06f6 DM |
2795 | int unit_reset_ip_accounting(Unit *u) { |
2796 | int r = 0, q = 0; | |
2797 | ||
2798 | assert(u); | |
2799 | ||
2800 | if (u->ip_accounting_ingress_map_fd >= 0) | |
2801 | r = bpf_firewall_reset_accounting(u->ip_accounting_ingress_map_fd); | |
2802 | ||
2803 | if (u->ip_accounting_egress_map_fd >= 0) | |
2804 | q = bpf_firewall_reset_accounting(u->ip_accounting_egress_map_fd); | |
2805 | ||
6b659ed8 LP |
2806 | zero(u->ip_accounting_extra); |
2807 | ||
906c06f6 DM |
2808 | return r < 0 ? r : q; |
2809 | } | |
2810 | ||
e7ab4d1a LP |
2811 | void unit_invalidate_cgroup(Unit *u, CGroupMask m) { |
2812 | assert(u); | |
2813 | ||
2814 | if (!UNIT_HAS_CGROUP_CONTEXT(u)) | |
2815 | return; | |
2816 | ||
2817 | if (m == 0) | |
2818 | return; | |
2819 | ||
538b4852 TH |
2820 | /* always invalidate compat pairs together */ |
2821 | if (m & (CGROUP_MASK_IO | CGROUP_MASK_BLKIO)) | |
2822 | m |= CGROUP_MASK_IO | CGROUP_MASK_BLKIO; | |
2823 | ||
7cce4fb7 LP |
2824 | if (m & (CGROUP_MASK_CPU | CGROUP_MASK_CPUACCT)) |
2825 | m |= CGROUP_MASK_CPU | CGROUP_MASK_CPUACCT; | |
2826 | ||
e00068e7 | 2827 | if (FLAGS_SET(u->cgroup_invalidated_mask, m)) /* NOP? */ |
e7ab4d1a LP |
2828 | return; |
2829 | ||
e00068e7 | 2830 | u->cgroup_invalidated_mask |= m; |
91a6073e | 2831 | unit_add_to_cgroup_realize_queue(u); |
e7ab4d1a LP |
2832 | } |
2833 | ||
906c06f6 DM |
2834 | void unit_invalidate_cgroup_bpf(Unit *u) { |
2835 | assert(u); | |
2836 | ||
2837 | if (!UNIT_HAS_CGROUP_CONTEXT(u)) | |
2838 | return; | |
2839 | ||
17f14955 | 2840 | if (u->cgroup_invalidated_mask & CGROUP_MASK_BPF_FIREWALL) /* NOP? */ |
906c06f6 DM |
2841 | return; |
2842 | ||
17f14955 | 2843 | u->cgroup_invalidated_mask |= CGROUP_MASK_BPF_FIREWALL; |
91a6073e | 2844 | unit_add_to_cgroup_realize_queue(u); |
906c06f6 DM |
2845 | |
2846 | /* If we are a slice unit, we also need to put compile a new BPF program for all our children, as the IP access | |
2847 | * list of our children includes our own. */ | |
2848 | if (u->type == UNIT_SLICE) { | |
2849 | Unit *member; | |
2850 | Iterator i; | |
eef85c4a | 2851 | void *v; |
906c06f6 | 2852 | |
eef85c4a | 2853 | HASHMAP_FOREACH_KEY(v, member, u->dependencies[UNIT_BEFORE], i) { |
906c06f6 DM |
2854 | if (member == u) |
2855 | continue; | |
2856 | ||
2857 | if (UNIT_DEREF(member->slice) != u) | |
2858 | continue; | |
2859 | ||
2860 | unit_invalidate_cgroup_bpf(member); | |
2861 | } | |
2862 | } | |
2863 | } | |
2864 | ||
1d9cc876 LP |
2865 | bool unit_cgroup_delegate(Unit *u) { |
2866 | CGroupContext *c; | |
2867 | ||
2868 | assert(u); | |
2869 | ||
2870 | if (!UNIT_VTABLE(u)->can_delegate) | |
2871 | return false; | |
2872 | ||
2873 | c = unit_get_cgroup_context(u); | |
2874 | if (!c) | |
2875 | return false; | |
2876 | ||
2877 | return c->delegate; | |
2878 | } | |
2879 | ||
e7ab4d1a LP |
2880 | void manager_invalidate_startup_units(Manager *m) { |
2881 | Iterator i; | |
2882 | Unit *u; | |
2883 | ||
2884 | assert(m); | |
2885 | ||
2886 | SET_FOREACH(u, m->startup_units, i) | |
13c31542 | 2887 | unit_invalidate_cgroup(u, CGROUP_MASK_CPU|CGROUP_MASK_IO|CGROUP_MASK_BLKIO); |
e7ab4d1a LP |
2888 | } |
2889 | ||
4ad49000 LP |
2890 | static const char* const cgroup_device_policy_table[_CGROUP_DEVICE_POLICY_MAX] = { |
2891 | [CGROUP_AUTO] = "auto", | |
2892 | [CGROUP_CLOSED] = "closed", | |
2893 | [CGROUP_STRICT] = "strict", | |
2894 | }; | |
4fbf50b3 | 2895 | |
4ad49000 | 2896 | DEFINE_STRING_TABLE_LOOKUP(cgroup_device_policy, CGroupDevicePolicy); |