Commit | Line | Data |
---|---|---|
20fe2104 | 1 | /* |
90c106c6 | 2 | * Copyright (C) 2011 EfficiOS Inc. |
20fe2104 | 3 | * |
ab5be9fa | 4 | * SPDX-License-Identifier: GPL-2.0-only |
20fe2104 | 5 | * |
20fe2104 DG |
6 | */ |
7 | ||
6c1c0768 | 8 | #define _LGPL_SOURCE |
7b395890 | 9 | #include <fcntl.h> |
20fe2104 DG |
10 | #include <stdlib.h> |
11 | #include <stdio.h> | |
f34daff7 | 12 | #include <string.h> |
8c0faa1d | 13 | #include <unistd.h> |
77c7c900 | 14 | #include <inttypes.h> |
7d268848 | 15 | #include <sys/types.h> |
20fe2104 | 16 | |
990570ed | 17 | #include <common/common.h> |
352b58f5 | 18 | #include <common/hashtable/utils.h> |
82b69413 | 19 | #include <common/trace-chunk.h> |
db758600 | 20 | #include <common/kernel-ctl/kernel-ctl.h> |
c052142c | 21 | #include <common/kernel-ctl/kernel-ioctl.h> |
42224349 | 22 | #include <common/sessiond-comm/sessiond-comm.h> |
c5bf436c JG |
23 | #include <common/tracker.h> |
24 | #include <common/utils.h> | |
25 | #include <lttng/event.h> | |
26 | #include <lttng/lttng-error.h> | |
27 | #include <lttng/tracker.h> | |
1e307fab | 28 | |
352b58f5 JR |
29 | #include <lttng/userspace-probe.h> |
30 | #include <lttng/userspace-probe-internal.h> | |
670a26e4 JR |
31 | #include <lttng/condition/event-rule-matches.h> |
32 | #include <lttng/condition/event-rule-matches-internal.h> | |
352b58f5 JR |
33 | #include <lttng/event-rule/event-rule.h> |
34 | #include <lttng/event-rule/event-rule-internal.h> | |
e60e9a9a | 35 | #include <lttng/event-rule/kernel-uprobe-internal.h> |
352b58f5 | 36 | |
90aa04a1 | 37 | #include "event-notifier-error-accounting.h" |
7d268848 MD |
38 | #include "lttng-sessiond.h" |
39 | #include "lttng-syscall.h" | |
352b58f5 | 40 | #include "condition-internal.h" |
2f77fc4b | 41 | #include "consumer.h" |
4771f025 | 42 | #include "kernel.h" |
6dc3064a | 43 | #include "kernel-consumer.h" |
096102bd | 44 | #include "kern-modules.h" |
90aa04a1 | 45 | #include "sessiond-config.h" |
834978fd | 46 | #include "utils.h" |
5c408ad8 | 47 | #include "rotate.h" |
7d268848 | 48 | #include "modprobe.h" |
c5bf436c | 49 | #include "tracker.h" |
352b58f5 | 50 | #include "notification-thread-commands.h" |
20fe2104 | 51 | |
e1f3997a JD |
52 | /* |
53 | * Key used to reference a channel between the sessiond and the consumer. This | |
54 | * is only read and updated with the session_list lock held. | |
55 | */ | |
56 | static uint64_t next_kernel_channel_key; | |
57 | ||
7d268848 MD |
58 | static const char *module_proc_lttng = "/proc/lttng"; |
59 | ||
60 | static int kernel_tracer_fd = -1; | |
352b58f5 JR |
61 | static int kernel_tracer_event_notifier_group_fd = -1; |
62 | static int kernel_tracer_event_notifier_group_notification_fd = -1; | |
63 | static struct cds_lfht *kernel_token_to_event_notifier_rule_ht; | |
7d268848 | 64 | |
36fdcbb4 OD |
65 | /* |
66 | * On some architectures, calling convention details are embedded in the symbol | |
67 | * addresses. Uprobe requires a "clean" symbol offset (or at least, an address | |
68 | * where an instruction boundary would be legal) to add | |
69 | * instrumentation. sanitize_uprobe_offset implements that sanitization logic on | |
70 | * a per-architecture basis. | |
71 | */ | |
72 | #if defined(__arm__) || defined(__aarch64__) | |
73 | static inline uint64_t sanitize_uprobe_offset(uint64_t raw_offset) | |
74 | { | |
75 | /* | |
76 | * The least significant bit is used when branching to switch to thumb | |
77 | * ISA. However, it's an invalid address for us; mask the least | |
78 | * significant bit. | |
79 | */ | |
80 | return raw_offset &= ~0b1; | |
81 | } | |
82 | #else /* defined(__arm__) || defined(__aarch64__) */ | |
83 | static inline uint64_t sanitize_uprobe_offset(uint64_t raw_offset) | |
84 | { | |
85 | return raw_offset; | |
86 | } | |
87 | #endif | |
88 | ||
d65106b1 | 89 | /* |
050349bb | 90 | * Add context on a kernel channel. |
df3c77c8 JG |
91 | * |
92 | * Assumes the ownership of ctx. | |
d65106b1 DG |
93 | */ |
94 | int kernel_add_channel_context(struct ltt_kernel_channel *chan, | |
645328ae | 95 | struct ltt_kernel_context *ctx) |
d65106b1 DG |
96 | { |
97 | int ret; | |
98 | ||
0525e9ae DG |
99 | assert(chan); |
100 | assert(ctx); | |
101 | ||
d65106b1 | 102 | DBG("Adding context to channel %s", chan->channel->name); |
645328ae | 103 | ret = kernctl_add_context(chan->fd, &ctx->ctx); |
d65106b1 | 104 | if (ret < 0) { |
32af2c95 | 105 | switch (-ret) { |
1ae5e83e JD |
106 | case ENOSYS: |
107 | /* Exists but not available for this kernel */ | |
108 | ret = LTTNG_ERR_KERN_CONTEXT_UNAVAILABLE; | |
109 | goto error; | |
110 | case EEXIST: | |
b579acd9 DG |
111 | /* If EEXIST, we just ignore the error */ |
112 | ret = 0; | |
1ae5e83e JD |
113 | goto end; |
114 | default: | |
115 | PERROR("add context ioctl"); | |
116 | ret = LTTNG_ERR_KERN_CONTEXT_FAIL; | |
117 | goto error; | |
b579acd9 | 118 | } |
d65106b1 | 119 | } |
21ed98c1 | 120 | ret = 0; |
d65106b1 | 121 | |
1ae5e83e | 122 | end: |
645328ae | 123 | cds_list_add_tail(&ctx->list, &chan->ctx_list); |
ba985c3a | 124 | ctx->in_list = true; |
df3c77c8 | 125 | ctx = NULL; |
d65106b1 | 126 | error: |
df3c77c8 JG |
127 | if (ctx) { |
128 | trace_kernel_destroy_context(ctx); | |
129 | } | |
d65106b1 DG |
130 | return ret; |
131 | } | |
132 | ||
20fe2104 | 133 | /* |
050349bb DG |
134 | * Create a new kernel session, register it to the kernel tracer and add it to |
135 | * the session daemon session. | |
20fe2104 | 136 | */ |
7d268848 | 137 | int kernel_create_session(struct ltt_session *session) |
20fe2104 DG |
138 | { |
139 | int ret; | |
140 | struct ltt_kernel_session *lks; | |
141 | ||
0525e9ae DG |
142 | assert(session); |
143 | ||
54012638 | 144 | /* Allocate data structure */ |
dec56f6c | 145 | lks = trace_kernel_create_session(); |
20fe2104 | 146 | if (lks == NULL) { |
54012638 | 147 | ret = -1; |
20fe2104 DG |
148 | goto error; |
149 | } | |
150 | ||
54012638 | 151 | /* Kernel tracer session creation */ |
7d268848 | 152 | ret = kernctl_create_session(kernel_tracer_fd); |
20fe2104 | 153 | if (ret < 0) { |
df0f840b | 154 | PERROR("ioctl kernel create session"); |
20fe2104 DG |
155 | goto error; |
156 | } | |
157 | ||
20fe2104 | 158 | lks->fd = ret; |
7b395890 DG |
159 | /* Prevent fd duplication after execlp() */ |
160 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
161 | if (ret < 0) { | |
df0f840b | 162 | PERROR("fcntl session fd"); |
7b395890 DG |
163 | } |
164 | ||
53632229 | 165 | lks->id = session->id; |
3bd1e081 | 166 | lks->consumer_fds_sent = 0; |
8c0faa1d | 167 | session->kernel_session = lks; |
8c0faa1d DG |
168 | |
169 | DBG("Kernel session created (fd: %d)", lks->fd); | |
20fe2104 | 170 | |
8ff4109e JR |
171 | /* |
172 | * This is necessary since the creation time is present in the session | |
173 | * name when it is generated. | |
174 | */ | |
175 | if (session->has_auto_generated_name) { | |
176 | ret = kernctl_session_set_name(lks->fd, DEFAULT_SESSION_NAME); | |
177 | } else { | |
178 | ret = kernctl_session_set_name(lks->fd, session->name); | |
179 | } | |
180 | if (ret) { | |
181 | WARN("Could not set kernel session name for session %" PRIu64 " name: %s", | |
182 | session->id, session->name); | |
183 | } | |
184 | ||
e04b2181 JR |
185 | ret = kernctl_session_set_creation_time(lks->fd, session->creation_time); |
186 | if (ret) { | |
187 | WARN("Could not set kernel session creation time for session %" PRIu64 " name: %s", | |
188 | session->id, session->name); | |
189 | } | |
190 | ||
20fe2104 DG |
191 | return 0; |
192 | ||
193 | error: | |
5f62c685 DG |
194 | if (lks) { |
195 | trace_kernel_destroy_session(lks); | |
d070c424 | 196 | trace_kernel_free_session(lks); |
5f62c685 | 197 | } |
20fe2104 DG |
198 | return ret; |
199 | } | |
200 | ||
201 | /* | |
050349bb DG |
202 | * Create a kernel channel, register it to the kernel tracer and add it to the |
203 | * kernel session. | |
20fe2104 | 204 | */ |
050349bb | 205 | int kernel_create_channel(struct ltt_kernel_session *session, |
fdd9eb17 | 206 | struct lttng_channel *chan) |
20fe2104 DG |
207 | { |
208 | int ret; | |
209 | struct ltt_kernel_channel *lkc; | |
20fe2104 | 210 | |
0525e9ae DG |
211 | assert(session); |
212 | assert(chan); | |
0525e9ae | 213 | |
54012638 | 214 | /* Allocate kernel channel */ |
fdd9eb17 | 215 | lkc = trace_kernel_create_channel(chan); |
54012638 | 216 | if (lkc == NULL) { |
20fe2104 DG |
217 | goto error; |
218 | } | |
219 | ||
ecc48a90 | 220 | DBG3("Kernel create channel %s with attr: %d, %" PRIu64 ", %" PRIu64 ", %u, %u, %d, %d", |
fdd9eb17 | 221 | chan->name, lkc->channel->attr.overwrite, |
173af62f DG |
222 | lkc->channel->attr.subbuf_size, lkc->channel->attr.num_subbuf, |
223 | lkc->channel->attr.switch_timer_interval, lkc->channel->attr.read_timer_interval, | |
ecc48a90 | 224 | lkc->channel->attr.live_timer_interval, lkc->channel->attr.output); |
173af62f | 225 | |
54012638 | 226 | /* Kernel tracer channel creation */ |
f3ed775e | 227 | ret = kernctl_create_channel(session->fd, &lkc->channel->attr); |
20fe2104 | 228 | if (ret < 0) { |
df0f840b | 229 | PERROR("ioctl kernel create channel"); |
20fe2104 DG |
230 | goto error; |
231 | } | |
232 | ||
54012638 | 233 | /* Setup the channel fd */ |
20fe2104 | 234 | lkc->fd = ret; |
7b395890 DG |
235 | /* Prevent fd duplication after execlp() */ |
236 | ret = fcntl(lkc->fd, F_SETFD, FD_CLOEXEC); | |
237 | if (ret < 0) { | |
df0f840b | 238 | PERROR("fcntl session fd"); |
7b395890 DG |
239 | } |
240 | ||
54012638 | 241 | /* Add channel to session */ |
8c0faa1d DG |
242 | cds_list_add(&lkc->list, &session->channel_list.head); |
243 | session->channel_count++; | |
fb5f35b6 | 244 | lkc->session = session; |
e1f3997a | 245 | lkc->key = ++next_kernel_channel_key; |
20fe2104 | 246 | |
e1f3997a JD |
247 | DBG("Kernel channel %s created (fd: %d, key: %" PRIu64 ")", |
248 | lkc->channel->name, lkc->fd, lkc->key); | |
20fe2104 DG |
249 | |
250 | return 0; | |
251 | ||
252 | error: | |
5f62c685 DG |
253 | if (lkc) { |
254 | free(lkc->channel); | |
255 | free(lkc); | |
256 | } | |
54012638 | 257 | return -1; |
20fe2104 | 258 | } |
f34daff7 | 259 | |
352b58f5 JR |
260 | /* |
261 | * Create a kernel event notifier group, register it to the kernel tracer and | |
262 | * add it to the kernel session. | |
263 | */ | |
264 | static int kernel_create_event_notifier_group(int *event_notifier_group_fd) | |
265 | { | |
266 | int ret; | |
267 | int local_fd = -1; | |
268 | ||
269 | assert(event_notifier_group_fd); | |
270 | ||
271 | /* Kernel event notifier group creation. */ | |
272 | ret = kernctl_create_event_notifier_group(kernel_tracer_fd); | |
273 | if (ret < 0) { | |
274 | PERROR("Failed to create kernel event notifier group"); | |
275 | ret = -1; | |
276 | goto error; | |
277 | } | |
278 | ||
279 | local_fd = ret; | |
280 | ||
281 | /* Prevent fd duplication after execlp(). */ | |
282 | ret = fcntl(local_fd, F_SETFD, FD_CLOEXEC); | |
283 | if (ret < 0) { | |
284 | PERROR("Failed to set FD_CLOEXEC on kernel event notifier group file descriptor: fd = %d", | |
285 | local_fd); | |
286 | goto error; | |
287 | } | |
288 | ||
289 | DBG("Created kernel event notifier group: fd = %d", local_fd); | |
290 | *event_notifier_group_fd = local_fd; | |
291 | local_fd = -1; | |
292 | ret = 0; | |
293 | error: | |
294 | if (local_fd >= 0) { | |
295 | ret = close(local_fd); | |
296 | if (ret) { | |
297 | PERROR("Failed to close kernel event notifier group file descriptor: fd = %d", | |
298 | local_fd); | |
299 | } | |
300 | } | |
301 | ||
302 | return ret; | |
303 | } | |
304 | ||
410b78a0 FD |
305 | /* |
306 | * Compute the offset of the instrumentation byte in the binary based on the | |
307 | * function probe location using the ELF lookup method. | |
308 | * | |
309 | * Returns 0 on success and set the offset out parameter to the offset of the | |
310 | * elf symbol | |
311 | * Returns -1 on error | |
312 | */ | |
313 | static | |
314 | int extract_userspace_probe_offset_function_elf( | |
87597c2c | 315 | const struct lttng_userspace_probe_location *probe_location, |
0a398bc4 | 316 | uid_t uid, gid_t gid, uint64_t *offset) |
410b78a0 FD |
317 | { |
318 | int fd; | |
319 | int ret = 0; | |
320 | const char *symbol = NULL; | |
87597c2c | 321 | const struct lttng_userspace_probe_location_lookup_method *lookup = NULL; |
410b78a0 FD |
322 | enum lttng_userspace_probe_location_lookup_method_type lookup_method_type; |
323 | ||
410b78a0 FD |
324 | assert(lttng_userspace_probe_location_get_type(probe_location) == |
325 | LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION); | |
326 | ||
327 | lookup = lttng_userspace_probe_location_get_lookup_method( | |
328 | probe_location); | |
329 | if (!lookup) { | |
330 | ret = -1; | |
331 | goto end; | |
332 | } | |
333 | ||
334 | lookup_method_type = | |
335 | lttng_userspace_probe_location_lookup_method_get_type(lookup); | |
336 | ||
337 | assert(lookup_method_type == | |
338 | LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF); | |
339 | ||
340 | symbol = lttng_userspace_probe_location_function_get_function_name( | |
341 | probe_location); | |
342 | if (!symbol) { | |
343 | ret = -1; | |
344 | goto end; | |
345 | } | |
346 | ||
347 | fd = lttng_userspace_probe_location_function_get_binary_fd(probe_location); | |
348 | if (fd < 0) { | |
349 | ret = -1; | |
350 | goto end; | |
351 | } | |
352 | ||
0a398bc4 | 353 | ret = run_as_extract_elf_symbol_offset(fd, symbol, uid, gid, offset); |
410b78a0 FD |
354 | if (ret < 0) { |
355 | DBG("userspace probe offset calculation failed for " | |
356 | "function %s", symbol); | |
357 | goto end; | |
358 | } | |
359 | ||
360 | DBG("userspace probe elf offset for %s is 0x%jd", symbol, (intmax_t)(*offset)); | |
361 | end: | |
362 | return ret; | |
363 | } | |
364 | ||
365 | /* | |
366 | * Compute the offsets of the instrumentation bytes in the binary based on the | |
367 | * tracepoint probe location using the SDT lookup method. This function | |
368 | * allocates the offsets buffer, the caller must free it. | |
369 | * | |
370 | * Returns 0 on success and set the offset out parameter to the offsets of the | |
371 | * SDT tracepoint. | |
372 | * Returns -1 on error. | |
373 | */ | |
374 | static | |
375 | int extract_userspace_probe_offset_tracepoint_sdt( | |
87597c2c | 376 | const struct lttng_userspace_probe_location *probe_location, |
0a398bc4 | 377 | uid_t uid, gid_t gid, uint64_t **offsets, |
410b78a0 FD |
378 | uint32_t *offsets_count) |
379 | { | |
380 | enum lttng_userspace_probe_location_lookup_method_type lookup_method_type; | |
87597c2c | 381 | const struct lttng_userspace_probe_location_lookup_method *lookup = NULL; |
410b78a0 FD |
382 | const char *probe_name = NULL, *provider_name = NULL; |
383 | int ret = 0; | |
384 | int fd, i; | |
385 | ||
386 | assert(lttng_userspace_probe_location_get_type(probe_location) == | |
387 | LTTNG_USERSPACE_PROBE_LOCATION_TYPE_TRACEPOINT); | |
388 | ||
389 | lookup = lttng_userspace_probe_location_get_lookup_method(probe_location); | |
390 | if (!lookup) { | |
391 | ret = -1; | |
392 | goto end; | |
393 | } | |
394 | ||
395 | lookup_method_type = | |
396 | lttng_userspace_probe_location_lookup_method_get_type(lookup); | |
397 | ||
398 | assert(lookup_method_type == | |
399 | LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_TRACEPOINT_SDT); | |
400 | ||
401 | ||
402 | probe_name = lttng_userspace_probe_location_tracepoint_get_probe_name( | |
403 | probe_location); | |
404 | if (!probe_name) { | |
405 | ret = -1; | |
406 | goto end; | |
407 | } | |
408 | ||
409 | provider_name = lttng_userspace_probe_location_tracepoint_get_provider_name( | |
410 | probe_location); | |
411 | if (!provider_name) { | |
412 | ret = -1; | |
413 | goto end; | |
414 | } | |
415 | ||
416 | fd = lttng_userspace_probe_location_tracepoint_get_binary_fd(probe_location); | |
417 | if (fd < 0) { | |
418 | ret = -1; | |
419 | goto end; | |
420 | } | |
421 | ||
422 | ret = run_as_extract_sdt_probe_offsets(fd, provider_name, probe_name, | |
0a398bc4 | 423 | uid, gid, offsets, offsets_count); |
410b78a0 FD |
424 | if (ret < 0) { |
425 | DBG("userspace probe offset calculation failed for sdt " | |
426 | "probe %s:%s", provider_name, probe_name); | |
427 | goto end; | |
428 | } | |
429 | ||
430 | if (*offsets_count == 0) { | |
431 | DBG("no userspace probe offset found"); | |
432 | goto end; | |
433 | } | |
434 | ||
435 | DBG("%u userspace probe SDT offsets found for %s:%s at:", | |
436 | *offsets_count, provider_name, probe_name); | |
437 | for (i = 0; i < *offsets_count; i++) { | |
438 | DBG("\t0x%jd", (intmax_t)((*offsets)[i])); | |
439 | } | |
440 | end: | |
441 | return ret; | |
442 | } | |
443 | ||
410b78a0 | 444 | static |
0a398bc4 FD |
445 | int userspace_probe_add_callsite( |
446 | const struct lttng_userspace_probe_location *location, | |
447 | uid_t uid, gid_t gid, int fd) | |
410b78a0 | 448 | { |
87597c2c | 449 | const struct lttng_userspace_probe_location_lookup_method *lookup_method = NULL; |
410b78a0 | 450 | enum lttng_userspace_probe_location_lookup_method_type type; |
410b78a0 FD |
451 | int ret; |
452 | ||
0a398bc4 | 453 | lookup_method = lttng_userspace_probe_location_get_lookup_method(location); |
410b78a0 FD |
454 | if (!lookup_method) { |
455 | ret = -1; | |
456 | goto end; | |
457 | } | |
458 | ||
459 | type = lttng_userspace_probe_location_lookup_method_get_type(lookup_method); | |
460 | switch (type) { | |
461 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF: | |
462 | { | |
2d6bae7e | 463 | struct lttng_kernel_abi_event_callsite callsite; |
410b78a0 FD |
464 | uint64_t offset; |
465 | ||
0a398bc4 FD |
466 | ret = extract_userspace_probe_offset_function_elf(location, |
467 | uid, gid, &offset); | |
410b78a0 FD |
468 | if (ret) { |
469 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
470 | goto end; | |
471 | } | |
472 | ||
36fdcbb4 | 473 | callsite.u.uprobe.offset = sanitize_uprobe_offset(offset); |
410b78a0 FD |
474 | ret = kernctl_add_callsite(fd, &callsite); |
475 | if (ret) { | |
0a398bc4 | 476 | WARN("Failed to add callsite to ELF userspace probe."); |
410b78a0 FD |
477 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
478 | goto end; | |
479 | } | |
480 | break; | |
481 | } | |
482 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_TRACEPOINT_SDT: | |
483 | { | |
484 | int i; | |
485 | uint64_t *offsets = NULL; | |
486 | uint32_t offsets_count; | |
2d6bae7e | 487 | struct lttng_kernel_abi_event_callsite callsite; |
410b78a0 FD |
488 | |
489 | /* | |
490 | * This call allocates the offsets buffer. This buffer must be freed | |
491 | * by the caller | |
492 | */ | |
0a398bc4 FD |
493 | ret = extract_userspace_probe_offset_tracepoint_sdt(location, |
494 | uid, gid, &offsets, &offsets_count); | |
410b78a0 FD |
495 | if (ret) { |
496 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
497 | goto end; | |
498 | } | |
499 | for (i = 0; i < offsets_count; i++) { | |
36fdcbb4 | 500 | callsite.u.uprobe.offset = sanitize_uprobe_offset(offsets[i]); |
410b78a0 FD |
501 | ret = kernctl_add_callsite(fd, &callsite); |
502 | if (ret) { | |
0a398bc4 | 503 | WARN("Failed to add callsite to SDT userspace probe"); |
410b78a0 FD |
504 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
505 | free(offsets); | |
506 | goto end; | |
507 | } | |
508 | } | |
509 | free(offsets); | |
510 | break; | |
511 | } | |
512 | default: | |
513 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
514 | goto end; | |
515 | } | |
516 | end: | |
517 | return ret; | |
518 | } | |
519 | ||
0a398bc4 FD |
520 | /* |
521 | * Extract the offsets of the instrumentation point for the different lookup | |
522 | * methods. | |
523 | */ | |
524 | static | |
525 | int userspace_probe_event_add_callsites(struct lttng_event *ev, | |
526 | struct ltt_kernel_session *session, int fd) | |
527 | { | |
528 | int ret; | |
529 | const struct lttng_userspace_probe_location *location = NULL; | |
530 | ||
531 | assert(ev); | |
532 | assert(ev->type == LTTNG_EVENT_USERSPACE_PROBE); | |
533 | ||
534 | location = lttng_event_get_userspace_probe_location(ev); | |
535 | if (!location) { | |
536 | ret = -1; | |
537 | goto end; | |
538 | } | |
539 | ||
540 | ret = userspace_probe_add_callsite(location, session->uid, session->gid, | |
541 | fd); | |
542 | if (ret) { | |
543 | WARN("Failed to add callsite to userspace probe event '%s'", | |
544 | ev->name); | |
545 | } | |
546 | ||
547 | end: | |
548 | return ret; | |
549 | } | |
550 | ||
352b58f5 JR |
551 | /* |
552 | * Extract the offsets of the instrumentation point for the different look-up | |
553 | * methods. | |
554 | */ | |
555 | static int userspace_probe_event_rule_add_callsites( | |
556 | const struct lttng_event_rule *rule, | |
557 | const struct lttng_credentials *creds, | |
558 | int fd) | |
559 | { | |
560 | int ret; | |
561 | enum lttng_event_rule_status status; | |
562 | enum lttng_event_rule_type event_rule_type; | |
563 | const struct lttng_userspace_probe_location *location = NULL; | |
564 | ||
565 | assert(rule); | |
566 | assert(creds); | |
567 | ||
568 | event_rule_type = lttng_event_rule_get_type(rule); | |
e60e9a9a | 569 | assert(event_rule_type == LTTNG_EVENT_RULE_TYPE_KERNEL_UPROBE); |
352b58f5 | 570 | |
e60e9a9a | 571 | status = lttng_event_rule_kernel_uprobe_get_location(rule, &location); |
352b58f5 JR |
572 | if (status != LTTNG_EVENT_RULE_STATUS_OK || !location) { |
573 | ret = -1; | |
574 | goto end; | |
575 | } | |
576 | ||
577 | ret = userspace_probe_add_callsite(location, | |
578 | lttng_credentials_get_uid(creds), | |
579 | lttng_credentials_get_gid(creds), fd); | |
580 | if (ret) { | |
581 | WARN("Failed to add callsite to user space probe object: fd = %d", | |
582 | fd); | |
583 | } | |
584 | ||
585 | end: | |
586 | return ret; | |
587 | } | |
588 | ||
f34daff7 | 589 | /* |
050349bb DG |
590 | * Create a kernel event, enable it to the kernel tracer and add it to the |
591 | * channel event list of the kernel session. | |
49d21f93 | 592 | * We own filter_expression and filter. |
f34daff7 | 593 | */ |
050349bb | 594 | int kernel_create_event(struct lttng_event *ev, |
00a62084 MD |
595 | struct ltt_kernel_channel *channel, |
596 | char *filter_expression, | |
2b00d462 | 597 | struct lttng_bytecode *filter) |
f34daff7 | 598 | { |
71a3bb01 FD |
599 | int err, fd; |
600 | enum lttng_error_code ret; | |
f34daff7 | 601 | struct ltt_kernel_event *event; |
f34daff7 | 602 | |
0525e9ae DG |
603 | assert(ev); |
604 | assert(channel); | |
605 | ||
a969e101 | 606 | /* We pass ownership of filter_expression and filter */ |
71a3bb01 FD |
607 | ret = trace_kernel_create_event(ev, filter_expression, |
608 | filter, &event); | |
609 | if (ret != LTTNG_OK) { | |
f34daff7 DG |
610 | goto error; |
611 | } | |
612 | ||
71a3bb01 FD |
613 | fd = kernctl_create_event(channel->fd, event->event); |
614 | if (fd < 0) { | |
615 | switch (-fd) { | |
bd29c13d | 616 | case EEXIST: |
71a3bb01 | 617 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
bd29c13d DG |
618 | break; |
619 | case ENOSYS: | |
620 | WARN("Event type not implemented"); | |
71a3bb01 | 621 | ret = LTTNG_ERR_KERN_EVENT_ENOSYS; |
bd29c13d | 622 | break; |
8197a339 DG |
623 | case ENOENT: |
624 | WARN("Event %s not found!", ev->name); | |
71a3bb01 | 625 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
8197a339 | 626 | break; |
bd29c13d | 627 | default: |
71a3bb01 | 628 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
d87bfb32 DG |
629 | PERROR("create event ioctl"); |
630 | } | |
e953ef25 | 631 | goto free_event; |
8c0faa1d | 632 | } |
f34daff7 | 633 | |
d0ae4ea8 | 634 | event->type = ev->type; |
71a3bb01 | 635 | event->fd = fd; |
7b395890 | 636 | /* Prevent fd duplication after execlp() */ |
71a3bb01 FD |
637 | err = fcntl(event->fd, F_SETFD, FD_CLOEXEC); |
638 | if (err < 0) { | |
df0f840b | 639 | PERROR("fcntl session fd"); |
7b395890 DG |
640 | } |
641 | ||
00a62084 | 642 | if (filter) { |
71a3bb01 FD |
643 | err = kernctl_filter(event->fd, filter); |
644 | if (err < 0) { | |
645 | switch (-err) { | |
646 | case ENOMEM: | |
647 | ret = LTTNG_ERR_FILTER_NOMEM; | |
648 | break; | |
649 | default: | |
650 | ret = LTTNG_ERR_FILTER_INVAL; | |
651 | break; | |
652 | } | |
00a62084 MD |
653 | goto filter_error; |
654 | } | |
655 | } | |
656 | ||
dcabc190 | 657 | if (ev->type == LTTNG_EVENT_USERSPACE_PROBE) { |
0a398bc4 FD |
658 | ret = userspace_probe_event_add_callsites(ev, channel->session, |
659 | event->fd); | |
dcabc190 FD |
660 | if (ret) { |
661 | goto add_callsite_error; | |
662 | } | |
663 | } | |
664 | ||
71a3bb01 FD |
665 | err = kernctl_enable(event->fd); |
666 | if (err < 0) { | |
667 | switch (-err) { | |
00a62084 MD |
668 | case EEXIST: |
669 | ret = LTTNG_ERR_KERN_EVENT_EXIST; | |
670 | break; | |
671 | default: | |
672 | PERROR("enable kernel event"); | |
71a3bb01 | 673 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
00a62084 MD |
674 | break; |
675 | } | |
676 | goto enable_error; | |
677 | } | |
678 | ||
f3ed775e DG |
679 | /* Add event to event list */ |
680 | cds_list_add(&event->list, &channel->events_list.head); | |
cbbbb275 DG |
681 | channel->event_count++; |
682 | ||
e953ef25 DG |
683 | DBG("Event %s created (fd: %d)", ev->name, event->fd); |
684 | ||
685 | return 0; | |
686 | ||
dcabc190 | 687 | add_callsite_error: |
00a62084 MD |
688 | enable_error: |
689 | filter_error: | |
690 | { | |
691 | int closeret; | |
692 | ||
693 | closeret = close(event->fd); | |
694 | if (closeret) { | |
695 | PERROR("close event fd"); | |
696 | } | |
697 | } | |
e953ef25 DG |
698 | free_event: |
699 | free(event); | |
700 | error: | |
d87bfb32 | 701 | return ret; |
e953ef25 DG |
702 | } |
703 | ||
26cc6b4e | 704 | /* |
050349bb | 705 | * Disable a kernel channel. |
26cc6b4e DG |
706 | */ |
707 | int kernel_disable_channel(struct ltt_kernel_channel *chan) | |
708 | { | |
709 | int ret; | |
710 | ||
0525e9ae DG |
711 | assert(chan); |
712 | ||
26cc6b4e DG |
713 | ret = kernctl_disable(chan->fd); |
714 | if (ret < 0) { | |
df0f840b | 715 | PERROR("disable chan ioctl"); |
26cc6b4e DG |
716 | goto error; |
717 | } | |
718 | ||
719 | chan->enabled = 0; | |
e1f3997a JD |
720 | DBG("Kernel channel %s disabled (fd: %d, key: %" PRIu64 ")", |
721 | chan->channel->name, chan->fd, chan->key); | |
26cc6b4e DG |
722 | |
723 | return 0; | |
724 | ||
725 | error: | |
726 | return ret; | |
727 | } | |
728 | ||
d36b8583 | 729 | /* |
050349bb | 730 | * Enable a kernel channel. |
d36b8583 DG |
731 | */ |
732 | int kernel_enable_channel(struct ltt_kernel_channel *chan) | |
733 | { | |
734 | int ret; | |
735 | ||
0525e9ae DG |
736 | assert(chan); |
737 | ||
d36b8583 | 738 | ret = kernctl_enable(chan->fd); |
32af2c95 | 739 | if (ret < 0 && ret != -EEXIST) { |
df0f840b | 740 | PERROR("Enable kernel chan"); |
d36b8583 DG |
741 | goto error; |
742 | } | |
743 | ||
744 | chan->enabled = 1; | |
e1f3997a JD |
745 | DBG("Kernel channel %s enabled (fd: %d, key: %" PRIu64 ")", |
746 | chan->channel->name, chan->fd, chan->key); | |
d36b8583 DG |
747 | |
748 | return 0; | |
749 | ||
750 | error: | |
751 | return ret; | |
752 | } | |
753 | ||
19e70852 | 754 | /* |
050349bb | 755 | * Enable a kernel event. |
19e70852 DG |
756 | */ |
757 | int kernel_enable_event(struct ltt_kernel_event *event) | |
758 | { | |
759 | int ret; | |
760 | ||
0525e9ae DG |
761 | assert(event); |
762 | ||
19e70852 | 763 | ret = kernctl_enable(event->fd); |
42224349 | 764 | if (ret < 0) { |
32af2c95 | 765 | switch (-ret) { |
42224349 | 766 | case EEXIST: |
f73fabfd | 767 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
42224349 DG |
768 | break; |
769 | default: | |
770 | PERROR("enable kernel event"); | |
771 | break; | |
772 | } | |
19e70852 DG |
773 | goto error; |
774 | } | |
775 | ||
776 | event->enabled = 1; | |
777 | DBG("Kernel event %s enabled (fd: %d)", event->event->name, event->fd); | |
778 | ||
779 | return 0; | |
780 | ||
781 | error: | |
d36b8583 | 782 | return ret; |
19e70852 DG |
783 | } |
784 | ||
e953ef25 | 785 | /* |
050349bb | 786 | * Disable a kernel event. |
e953ef25 | 787 | */ |
19e70852 | 788 | int kernel_disable_event(struct ltt_kernel_event *event) |
e953ef25 DG |
789 | { |
790 | int ret; | |
19e70852 | 791 | |
0525e9ae DG |
792 | assert(event); |
793 | ||
19e70852 | 794 | ret = kernctl_disable(event->fd); |
42224349 | 795 | if (ret < 0) { |
d79bd829 JG |
796 | PERROR("Failed to disable kernel event: name = '%s', fd = %d", |
797 | event->event->name, event->fd); | |
19e70852 | 798 | goto error; |
e953ef25 | 799 | } |
f3ed775e | 800 | |
19e70852 DG |
801 | event->enabled = 0; |
802 | DBG("Kernel event %s disabled (fd: %d)", event->event->name, event->fd); | |
803 | ||
f34daff7 DG |
804 | return 0; |
805 | ||
806 | error: | |
d36b8583 | 807 | return ret; |
f34daff7 | 808 | } |
aaf26714 | 809 | |
352b58f5 JR |
810 | /* |
811 | * Disable a kernel event notifier. | |
812 | */ | |
813 | static | |
814 | int kernel_disable_event_notifier_rule(struct ltt_kernel_event_notifier_rule *event) | |
815 | { | |
816 | int ret; | |
817 | ||
818 | assert(event); | |
819 | ||
820 | rcu_read_lock(); | |
821 | cds_lfht_del(kernel_token_to_event_notifier_rule_ht, &event->ht_node); | |
822 | rcu_read_unlock(); | |
823 | ||
824 | ret = kernctl_disable(event->fd); | |
825 | if (ret < 0) { | |
d79bd829 JG |
826 | PERROR("Failed to disable kernel event notifier: fd = %d, token = %" PRIu64, |
827 | event->fd, event->token); | |
352b58f5 JR |
828 | goto error; |
829 | } | |
830 | ||
831 | event->enabled = 0; | |
832 | DBG("Disabled kernel event notifier: fd = %d, token = %" PRIu64, | |
833 | event->fd, event->token); | |
834 | ||
835 | error: | |
836 | return ret; | |
837 | } | |
838 | ||
159b042f JG |
839 | static |
840 | struct process_attr_tracker *_kernel_get_process_attr_tracker( | |
55c9e7ca | 841 | struct ltt_kernel_session *session, |
159b042f | 842 | enum lttng_process_attr process_attr) |
55c9e7ca | 843 | { |
159b042f JG |
844 | switch (process_attr) { |
845 | case LTTNG_PROCESS_ATTR_PROCESS_ID: | |
846 | return session->tracker_pid; | |
847 | case LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID: | |
848 | return session->tracker_vpid; | |
849 | case LTTNG_PROCESS_ATTR_USER_ID: | |
850 | return session->tracker_uid; | |
851 | case LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID: | |
852 | return session->tracker_vuid; | |
853 | case LTTNG_PROCESS_ATTR_GROUP_ID: | |
854 | return session->tracker_gid; | |
855 | case LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID: | |
856 | return session->tracker_vgid; | |
55c9e7ca JR |
857 | default: |
858 | return NULL; | |
859 | } | |
860 | } | |
6e911cad | 861 | |
159b042f | 862 | const struct process_attr_tracker *kernel_get_process_attr_tracker( |
55c9e7ca | 863 | struct ltt_kernel_session *session, |
159b042f | 864 | enum lttng_process_attr process_attr) |
ccf10263 | 865 | { |
159b042f JG |
866 | return (const struct process_attr_tracker *) |
867 | _kernel_get_process_attr_tracker(session, process_attr); | |
868 | } | |
7c493d31 | 869 | |
159b042f JG |
870 | enum lttng_error_code kernel_process_attr_tracker_set_tracking_policy( |
871 | struct ltt_kernel_session *session, | |
872 | enum lttng_process_attr process_attr, | |
873 | enum lttng_tracking_policy policy) | |
874 | { | |
875 | int ret; | |
876 | enum lttng_error_code ret_code = LTTNG_OK; | |
877 | struct process_attr_tracker *tracker = | |
878 | _kernel_get_process_attr_tracker(session, process_attr); | |
879 | enum lttng_tracking_policy previous_policy; | |
55c9e7ca | 880 | |
159b042f JG |
881 | if (!tracker) { |
882 | ret_code = LTTNG_ERR_INVALID; | |
883 | goto end; | |
7c493d31 | 884 | } |
ccf10263 | 885 | |
159b042f JG |
886 | previous_policy = process_attr_tracker_get_tracking_policy(tracker); |
887 | ret = process_attr_tracker_set_tracking_policy(tracker, policy); | |
888 | if (ret) { | |
889 | ret_code = LTTNG_ERR_UNK; | |
890 | goto end; | |
55c9e7ca | 891 | } |
7c493d31 | 892 | |
159b042f | 893 | if (previous_policy == policy) { |
55c9e7ca | 894 | goto end; |
7c493d31 | 895 | } |
55c9e7ca | 896 | |
159b042f JG |
897 | switch (policy) { |
898 | case LTTNG_TRACKING_POLICY_INCLUDE_ALL: | |
899 | if (process_attr == LTTNG_PROCESS_ATTR_PROCESS_ID) { | |
900 | /* | |
901 | * Maintain a special case for the process ID process | |
902 | * attribute tracker as it was the only supported | |
903 | * attribute prior to 2.12. | |
904 | */ | |
905 | ret = kernctl_track_pid(session->fd, -1); | |
906 | } else { | |
907 | ret = kernctl_track_id(session->fd, process_attr, -1); | |
55c9e7ca JR |
908 | } |
909 | break; | |
159b042f JG |
910 | case LTTNG_TRACKING_POLICY_EXCLUDE_ALL: |
911 | case LTTNG_TRACKING_POLICY_INCLUDE_SET: | |
912 | /* fall-through. */ | |
913 | if (process_attr == LTTNG_PROCESS_ATTR_PROCESS_ID) { | |
914 | /* | |
915 | * Maintain a special case for the process ID process | |
916 | * attribute tracker as it was the only supported | |
917 | * attribute prior to 2.12. | |
918 | */ | |
919 | ret = kernctl_untrack_pid(session->fd, -1); | |
920 | } else { | |
921 | ret = kernctl_untrack_id(session->fd, process_attr, -1); | |
55c9e7ca JR |
922 | } |
923 | break; | |
924 | default: | |
159b042f | 925 | abort(); |
55c9e7ca | 926 | } |
159b042f | 927 | /* kern-ctl error handling */ |
32af2c95 | 928 | switch (-ret) { |
159b042f JG |
929 | case 0: |
930 | ret_code = LTTNG_OK; | |
931 | break; | |
7c493d31 | 932 | case EINVAL: |
159b042f | 933 | ret_code = LTTNG_ERR_INVALID; |
55c9e7ca | 934 | break; |
7c493d31 | 935 | case ENOMEM: |
159b042f | 936 | ret_code = LTTNG_ERR_NOMEM; |
55c9e7ca JR |
937 | break; |
938 | case EEXIST: | |
159b042f | 939 | ret_code = LTTNG_ERR_PROCESS_ATTR_EXISTS; |
55c9e7ca | 940 | break; |
7c493d31 | 941 | default: |
159b042f | 942 | ret_code = LTTNG_ERR_UNK; |
55c9e7ca JR |
943 | break; |
944 | } | |
55c9e7ca | 945 | end: |
159b042f | 946 | return ret_code; |
ccf10263 MD |
947 | } |
948 | ||
159b042f | 949 | enum lttng_error_code kernel_process_attr_tracker_inclusion_set_add_value( |
55c9e7ca | 950 | struct ltt_kernel_session *session, |
159b042f JG |
951 | enum lttng_process_attr process_attr, |
952 | const struct process_attr_value *value) | |
a5dfbb9d | 953 | { |
159b042f JG |
954 | int ret, integral_value; |
955 | enum lttng_error_code ret_code; | |
956 | struct process_attr_tracker *tracker; | |
957 | enum process_attr_tracker_status status; | |
a5dfbb9d | 958 | |
159b042f JG |
959 | /* |
960 | * Convert process attribute tracker value to the integral | |
961 | * representation required by the kern-ctl API. | |
962 | */ | |
963 | switch (process_attr) { | |
964 | case LTTNG_PROCESS_ATTR_PROCESS_ID: | |
965 | case LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID: | |
966 | integral_value = (int) value->value.pid; | |
55c9e7ca | 967 | break; |
159b042f JG |
968 | case LTTNG_PROCESS_ATTR_USER_ID: |
969 | case LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID: | |
970 | if (value->type == LTTNG_PROCESS_ATTR_VALUE_TYPE_USER_NAME) { | |
971 | uid_t uid; | |
972 | ||
973 | ret_code = utils_user_id_from_name( | |
974 | value->value.user_name, &uid); | |
975 | if (ret_code != LTTNG_OK) { | |
976 | goto end; | |
977 | } | |
978 | integral_value = (int) uid; | |
979 | } else { | |
980 | integral_value = (int) value->value.uid; | |
55c9e7ca JR |
981 | } |
982 | break; | |
159b042f JG |
983 | case LTTNG_PROCESS_ATTR_GROUP_ID: |
984 | case LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID: | |
985 | if (value->type == LTTNG_PROCESS_ATTR_VALUE_TYPE_GROUP_NAME) { | |
986 | gid_t gid; | |
987 | ||
988 | ret_code = utils_group_id_from_name( | |
989 | value->value.group_name, &gid); | |
990 | if (ret_code != LTTNG_OK) { | |
991 | goto end; | |
992 | } | |
993 | integral_value = (int) gid; | |
994 | } else { | |
995 | integral_value = (int) value->value.gid; | |
a5dfbb9d | 996 | } |
55c9e7ca JR |
997 | break; |
998 | default: | |
159b042f JG |
999 | ret_code = LTTNG_ERR_INVALID; |
1000 | goto end; | |
55c9e7ca JR |
1001 | } |
1002 | ||
159b042f JG |
1003 | tracker = _kernel_get_process_attr_tracker(session, process_attr); |
1004 | if (!tracker) { | |
1005 | ret_code = LTTNG_ERR_INVALID; | |
1006 | goto end; | |
1007 | } | |
1008 | ||
1009 | status = process_attr_tracker_inclusion_set_add_value(tracker, value); | |
1010 | if (status != PROCESS_ATTR_TRACKER_STATUS_OK) { | |
1011 | switch (status) { | |
1012 | case PROCESS_ATTR_TRACKER_STATUS_EXISTS: | |
1013 | ret_code = LTTNG_ERR_PROCESS_ATTR_EXISTS; | |
1014 | break; | |
1015 | case PROCESS_ATTR_TRACKER_STATUS_INVALID_TRACKING_POLICY: | |
1016 | ret_code = LTTNG_ERR_PROCESS_ATTR_TRACKER_INVALID_TRACKING_POLICY; | |
1017 | break; | |
1018 | case PROCESS_ATTR_TRACKER_STATUS_ERROR: | |
1019 | default: | |
1020 | ret_code = LTTNG_ERR_UNK; | |
1021 | break; | |
1022 | } | |
1023 | goto end; | |
1024 | } | |
1025 | ||
1026 | DBG("Kernel track %s %d for session id %" PRIu64, | |
1027 | lttng_process_attr_to_string(process_attr), | |
1028 | integral_value, session->id); | |
1029 | if (process_attr == LTTNG_PROCESS_ATTR_PROCESS_ID) { | |
1030 | /* | |
1031 | * Maintain a special case for the process ID process attribute | |
1032 | * tracker as it was the only supported attribute prior to 2.12. | |
1033 | */ | |
1034 | ret = kernctl_track_pid(session->fd, integral_value); | |
1035 | } else { | |
1036 | ret = kernctl_track_id( | |
1037 | session->fd, process_attr, integral_value); | |
1038 | } | |
1039 | if (ret == 0) { | |
1040 | ret_code = LTTNG_OK; | |
1041 | goto end; | |
1042 | } | |
1043 | ||
1044 | kernel_wait_quiescent(); | |
1045 | ||
1046 | /* kern-ctl error handling */ | |
55c9e7ca | 1047 | switch (-ret) { |
159b042f JG |
1048 | case 0: |
1049 | ret_code = LTTNG_OK; | |
1050 | break; | |
55c9e7ca | 1051 | case EINVAL: |
159b042f | 1052 | ret_code = LTTNG_ERR_INVALID; |
55c9e7ca JR |
1053 | break; |
1054 | case ENOMEM: | |
159b042f | 1055 | ret_code = LTTNG_ERR_NOMEM; |
55c9e7ca JR |
1056 | break; |
1057 | case EEXIST: | |
159b042f | 1058 | ret_code = LTTNG_ERR_PROCESS_ATTR_EXISTS; |
55c9e7ca JR |
1059 | break; |
1060 | default: | |
159b042f | 1061 | ret_code = LTTNG_ERR_UNK; |
55c9e7ca | 1062 | break; |
a5dfbb9d MD |
1063 | } |
1064 | ||
159b042f JG |
1065 | /* Attempt to remove the value from the tracker. */ |
1066 | status = process_attr_tracker_inclusion_set_remove_value( | |
1067 | tracker, value); | |
1068 | if (status != PROCESS_ATTR_TRACKER_STATUS_OK) { | |
1069 | ERR("Failed to roll-back the tracking of kernel %s process attribute %d while handling a kern-ctl error", | |
1070 | lttng_process_attr_to_string(process_attr), | |
1071 | integral_value); | |
55c9e7ca | 1072 | } |
a5dfbb9d | 1073 | end: |
159b042f | 1074 | return ret_code; |
55c9e7ca | 1075 | } |
a5dfbb9d | 1076 | |
159b042f | 1077 | enum lttng_error_code kernel_process_attr_tracker_inclusion_set_remove_value( |
55c9e7ca | 1078 | struct ltt_kernel_session *session, |
159b042f JG |
1079 | enum lttng_process_attr process_attr, |
1080 | const struct process_attr_value *value) | |
55c9e7ca | 1081 | { |
159b042f JG |
1082 | int ret, integral_value; |
1083 | enum lttng_error_code ret_code; | |
1084 | struct process_attr_tracker *tracker; | |
1085 | enum process_attr_tracker_status status; | |
1086 | ||
1087 | /* | |
1088 | * Convert process attribute tracker value to the integral | |
1089 | * representation required by the kern-ctl API. | |
1090 | */ | |
1091 | switch (process_attr) { | |
1092 | case LTTNG_PROCESS_ATTR_PROCESS_ID: | |
1093 | case LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID: | |
1094 | integral_value = (int) value->value.pid; | |
1095 | break; | |
1096 | case LTTNG_PROCESS_ATTR_USER_ID: | |
1097 | case LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID: | |
1098 | if (value->type == LTTNG_PROCESS_ATTR_VALUE_TYPE_USER_NAME) { | |
1099 | uid_t uid; | |
1100 | ||
1101 | ret_code = utils_user_id_from_name( | |
1102 | value->value.user_name, &uid); | |
1103 | if (ret_code != LTTNG_OK) { | |
1104 | goto end; | |
1105 | } | |
1106 | integral_value = (int) uid; | |
1107 | } else { | |
1108 | integral_value = (int) value->value.uid; | |
1109 | } | |
1110 | break; | |
1111 | case LTTNG_PROCESS_ATTR_GROUP_ID: | |
1112 | case LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID: | |
1113 | if (value->type == LTTNG_PROCESS_ATTR_VALUE_TYPE_GROUP_NAME) { | |
1114 | gid_t gid; | |
1115 | ||
1116 | ret_code = utils_group_id_from_name( | |
1117 | value->value.group_name, &gid); | |
1118 | if (ret_code != LTTNG_OK) { | |
1119 | goto end; | |
1120 | } | |
1121 | integral_value = (int) gid; | |
1122 | } else { | |
1123 | integral_value = (int) value->value.gid; | |
1124 | } | |
1125 | break; | |
1126 | default: | |
1127 | ret_code = LTTNG_ERR_INVALID; | |
1128 | goto end; | |
1129 | } | |
55c9e7ca | 1130 | |
159b042f JG |
1131 | tracker = _kernel_get_process_attr_tracker(session, process_attr); |
1132 | if (!tracker) { | |
1133 | ret_code = LTTNG_ERR_INVALID; | |
a7a533cd | 1134 | goto end; |
a5dfbb9d | 1135 | } |
a7a533cd | 1136 | |
159b042f JG |
1137 | status = process_attr_tracker_inclusion_set_remove_value( |
1138 | tracker, value); | |
1139 | if (status != PROCESS_ATTR_TRACKER_STATUS_OK) { | |
1140 | switch (status) { | |
1141 | case PROCESS_ATTR_TRACKER_STATUS_MISSING: | |
1142 | ret_code = LTTNG_ERR_PROCESS_ATTR_MISSING; | |
1143 | break; | |
1144 | case PROCESS_ATTR_TRACKER_STATUS_INVALID_TRACKING_POLICY: | |
1145 | ret_code = LTTNG_ERR_PROCESS_ATTR_TRACKER_INVALID_TRACKING_POLICY; | |
1146 | break; | |
1147 | case PROCESS_ATTR_TRACKER_STATUS_ERROR: | |
1148 | default: | |
1149 | ret_code = LTTNG_ERR_UNK; | |
1150 | break; | |
1151 | } | |
a7a533cd JR |
1152 | goto end; |
1153 | } | |
1154 | ||
159b042f JG |
1155 | DBG("Kernel track %s %d for session id %" PRIu64, |
1156 | lttng_process_attr_to_string(process_attr), | |
1157 | integral_value, session->id); | |
1158 | if (process_attr == LTTNG_PROCESS_ATTR_PROCESS_ID) { | |
1159 | /* | |
1160 | * Maintain a special case for the process ID process attribute | |
1161 | * tracker as it was the only supported attribute prior to 2.12. | |
1162 | */ | |
1163 | ret = kernctl_untrack_pid(session->fd, integral_value); | |
1164 | } else { | |
1165 | ret = kernctl_untrack_id( | |
1166 | session->fd, process_attr, integral_value); | |
1167 | } | |
1168 | if (ret == 0) { | |
1169 | ret_code = LTTNG_OK; | |
1170 | goto end; | |
1171 | } | |
1172 | kernel_wait_quiescent(); | |
1173 | ||
1174 | /* kern-ctl error handling */ | |
1175 | switch (-ret) { | |
1176 | case 0: | |
1177 | ret_code = LTTNG_OK; | |
1178 | break; | |
1179 | case EINVAL: | |
1180 | ret_code = LTTNG_ERR_INVALID; | |
1181 | break; | |
1182 | case ENOMEM: | |
1183 | ret_code = LTTNG_ERR_NOMEM; | |
1184 | break; | |
1185 | case ENOENT: | |
1186 | ret_code = LTTNG_ERR_PROCESS_ATTR_MISSING; | |
1187 | break; | |
1188 | default: | |
1189 | ret_code = LTTNG_ERR_UNK; | |
1190 | break; | |
1191 | } | |
1192 | ||
1193 | /* Attempt to add the value to the tracker. */ | |
1194 | status = process_attr_tracker_inclusion_set_add_value( | |
1195 | tracker, value); | |
1196 | if (status != PROCESS_ATTR_TRACKER_STATUS_OK) { | |
1197 | ERR("Failed to roll-back the tracking of kernel %s process attribute %d while handling a kern-ctl error", | |
1198 | lttng_process_attr_to_string(process_attr), | |
1199 | integral_value); | |
1200 | } | |
a7a533cd | 1201 | end: |
159b042f | 1202 | return ret_code; |
a5dfbb9d MD |
1203 | } |
1204 | ||
aaf26714 | 1205 | /* |
050349bb DG |
1206 | * Create kernel metadata, open from the kernel tracer and add it to the |
1207 | * kernel session. | |
aaf26714 | 1208 | */ |
a4b92340 | 1209 | int kernel_open_metadata(struct ltt_kernel_session *session) |
aaf26714 DG |
1210 | { |
1211 | int ret; | |
74024a21 | 1212 | struct ltt_kernel_metadata *lkm = NULL; |
aaf26714 | 1213 | |
0525e9ae DG |
1214 | assert(session); |
1215 | ||
54012638 | 1216 | /* Allocate kernel metadata */ |
a4b92340 | 1217 | lkm = trace_kernel_create_metadata(); |
54012638 | 1218 | if (lkm == NULL) { |
aaf26714 DG |
1219 | goto error; |
1220 | } | |
1221 | ||
54012638 | 1222 | /* Kernel tracer metadata creation */ |
f3ed775e | 1223 | ret = kernctl_open_metadata(session->fd, &lkm->conf->attr); |
aaf26714 | 1224 | if (ret < 0) { |
74024a21 | 1225 | goto error_open; |
aaf26714 DG |
1226 | } |
1227 | ||
8c0faa1d | 1228 | lkm->fd = ret; |
d40f0359 | 1229 | lkm->key = ++next_kernel_channel_key; |
7b395890 DG |
1230 | /* Prevent fd duplication after execlp() */ |
1231 | ret = fcntl(lkm->fd, F_SETFD, FD_CLOEXEC); | |
1232 | if (ret < 0) { | |
df0f840b | 1233 | PERROR("fcntl session fd"); |
7b395890 DG |
1234 | } |
1235 | ||
aaf26714 | 1236 | session->metadata = lkm; |
8c0faa1d | 1237 | |
00e2e675 | 1238 | DBG("Kernel metadata opened (fd: %d)", lkm->fd); |
8c0faa1d DG |
1239 | |
1240 | return 0; | |
1241 | ||
74024a21 DG |
1242 | error_open: |
1243 | trace_kernel_destroy_metadata(lkm); | |
8c0faa1d | 1244 | error: |
54012638 | 1245 | return -1; |
8c0faa1d DG |
1246 | } |
1247 | ||
1248 | /* | |
050349bb | 1249 | * Start tracing session. |
8c0faa1d DG |
1250 | */ |
1251 | int kernel_start_session(struct ltt_kernel_session *session) | |
1252 | { | |
1253 | int ret; | |
1254 | ||
0525e9ae DG |
1255 | assert(session); |
1256 | ||
8c0faa1d DG |
1257 | ret = kernctl_start_session(session->fd); |
1258 | if (ret < 0) { | |
df0f840b | 1259 | PERROR("ioctl start session"); |
8c0faa1d DG |
1260 | goto error; |
1261 | } | |
1262 | ||
1263 | DBG("Kernel session started"); | |
1264 | ||
1265 | return 0; | |
1266 | ||
1267 | error: | |
1268 | return ret; | |
1269 | } | |
1270 | ||
f3ed775e | 1271 | /* |
050349bb | 1272 | * Make a kernel wait to make sure in-flight probe have completed. |
f3ed775e | 1273 | */ |
7d268848 | 1274 | void kernel_wait_quiescent(void) |
f3ed775e DG |
1275 | { |
1276 | int ret; | |
7d268848 | 1277 | int fd = kernel_tracer_fd; |
f3ed775e DG |
1278 | |
1279 | DBG("Kernel quiescent wait on %d", fd); | |
1280 | ||
1281 | ret = kernctl_wait_quiescent(fd); | |
1282 | if (ret < 0) { | |
df0f840b | 1283 | PERROR("wait quiescent ioctl"); |
f3ed775e DG |
1284 | ERR("Kernel quiescent wait failed"); |
1285 | } | |
1286 | } | |
1287 | ||
1288 | /* | |
f3ed775e DG |
1289 | * Force flush buffer of metadata. |
1290 | */ | |
1291 | int kernel_metadata_flush_buffer(int fd) | |
1292 | { | |
1293 | int ret; | |
1294 | ||
169d2cb7 DG |
1295 | DBG("Kernel flushing metadata buffer on fd %d", fd); |
1296 | ||
f3ed775e DG |
1297 | ret = kernctl_buffer_flush(fd); |
1298 | if (ret < 0) { | |
00e2e675 | 1299 | ERR("Fail to flush metadata buffers %d (ret: %d)", fd, ret); |
f3ed775e DG |
1300 | } |
1301 | ||
1302 | return 0; | |
1303 | } | |
1304 | ||
1305 | /* | |
050349bb | 1306 | * Force flush buffer for channel. |
f3ed775e DG |
1307 | */ |
1308 | int kernel_flush_buffer(struct ltt_kernel_channel *channel) | |
1309 | { | |
1310 | int ret; | |
1311 | struct ltt_kernel_stream *stream; | |
1312 | ||
0525e9ae DG |
1313 | assert(channel); |
1314 | ||
f3ed775e DG |
1315 | DBG("Flush buffer for channel %s", channel->channel->name); |
1316 | ||
1317 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { | |
1318 | DBG("Flushing channel stream %d", stream->fd); | |
1319 | ret = kernctl_buffer_flush(stream->fd); | |
1320 | if (ret < 0) { | |
df0f840b | 1321 | PERROR("ioctl"); |
f3ed775e DG |
1322 | ERR("Fail to flush buffer for stream %d (ret: %d)", |
1323 | stream->fd, ret); | |
1324 | } | |
1325 | } | |
1326 | ||
1327 | return 0; | |
1328 | } | |
1329 | ||
8c0faa1d | 1330 | /* |
050349bb | 1331 | * Stop tracing session. |
8c0faa1d DG |
1332 | */ |
1333 | int kernel_stop_session(struct ltt_kernel_session *session) | |
1334 | { | |
1335 | int ret; | |
1336 | ||
0525e9ae DG |
1337 | assert(session); |
1338 | ||
8c0faa1d DG |
1339 | ret = kernctl_stop_session(session->fd); |
1340 | if (ret < 0) { | |
1341 | goto error; | |
1342 | } | |
1343 | ||
1344 | DBG("Kernel session stopped"); | |
1345 | ||
1346 | return 0; | |
1347 | ||
1348 | error: | |
1349 | return ret; | |
1350 | } | |
1351 | ||
1352 | /* | |
050349bb DG |
1353 | * Open stream of channel, register it to the kernel tracer and add it |
1354 | * to the stream list of the channel. | |
8c0faa1d | 1355 | * |
1cfb4b98 MD |
1356 | * Note: given that the streams may appear in random order wrt CPU |
1357 | * number (e.g. cpu hotplug), the index value of the stream number in | |
1358 | * the stream name is not necessarily linked to the CPU number. | |
1359 | * | |
050349bb | 1360 | * Return the number of created stream. Else, a negative value. |
8c0faa1d | 1361 | */ |
f3ed775e | 1362 | int kernel_open_channel_stream(struct ltt_kernel_channel *channel) |
8c0faa1d | 1363 | { |
1cfb4b98 | 1364 | int ret; |
8c0faa1d DG |
1365 | struct ltt_kernel_stream *lks; |
1366 | ||
0525e9ae DG |
1367 | assert(channel); |
1368 | ||
5a47c6a2 | 1369 | while ((ret = kernctl_create_stream(channel->fd)) >= 0) { |
1cfb4b98 MD |
1370 | lks = trace_kernel_create_stream(channel->channel->name, |
1371 | channel->stream_count); | |
8c0faa1d | 1372 | if (lks == NULL) { |
799e2c4f MD |
1373 | ret = close(ret); |
1374 | if (ret) { | |
1375 | PERROR("close"); | |
1376 | } | |
8c0faa1d DG |
1377 | goto error; |
1378 | } | |
1379 | ||
1380 | lks->fd = ret; | |
7b395890 DG |
1381 | /* Prevent fd duplication after execlp() */ |
1382 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
1383 | if (ret < 0) { | |
df0f840b | 1384 | PERROR("fcntl session fd"); |
7b395890 DG |
1385 | } |
1386 | ||
1624d5b7 JD |
1387 | lks->tracefile_size = channel->channel->attr.tracefile_size; |
1388 | lks->tracefile_count = channel->channel->attr.tracefile_count; | |
1389 | ||
1cfb4b98 | 1390 | /* Add stream to channel stream list */ |
8c0faa1d DG |
1391 | cds_list_add(&lks->list, &channel->stream_list.head); |
1392 | channel->stream_count++; | |
8c0faa1d | 1393 | |
00e2e675 DG |
1394 | DBG("Kernel stream %s created (fd: %d, state: %d)", lks->name, lks->fd, |
1395 | lks->state); | |
54012638 | 1396 | } |
8c0faa1d DG |
1397 | |
1398 | return channel->stream_count; | |
1399 | ||
1400 | error: | |
54012638 | 1401 | return -1; |
8c0faa1d DG |
1402 | } |
1403 | ||
1404 | /* | |
050349bb | 1405 | * Open the metadata stream and set it to the kernel session. |
8c0faa1d | 1406 | */ |
f3ed775e | 1407 | int kernel_open_metadata_stream(struct ltt_kernel_session *session) |
8c0faa1d DG |
1408 | { |
1409 | int ret; | |
1410 | ||
0525e9ae DG |
1411 | assert(session); |
1412 | ||
8c0faa1d DG |
1413 | ret = kernctl_create_stream(session->metadata->fd); |
1414 | if (ret < 0) { | |
df0f840b | 1415 | PERROR("kernel create metadata stream"); |
8c0faa1d DG |
1416 | goto error; |
1417 | } | |
1418 | ||
1419 | DBG("Kernel metadata stream created (fd: %d)", ret); | |
1420 | session->metadata_stream_fd = ret; | |
7b395890 DG |
1421 | /* Prevent fd duplication after execlp() */ |
1422 | ret = fcntl(session->metadata_stream_fd, F_SETFD, FD_CLOEXEC); | |
1423 | if (ret < 0) { | |
df0f840b | 1424 | PERROR("fcntl session fd"); |
7b395890 | 1425 | } |
aaf26714 DG |
1426 | |
1427 | return 0; | |
1428 | ||
1429 | error: | |
54012638 | 1430 | return -1; |
aaf26714 | 1431 | } |
2ef84c95 DG |
1432 | |
1433 | /* | |
9f19cc17 | 1434 | * Get the event list from the kernel tracer and return the number of elements. |
2ef84c95 | 1435 | */ |
7d268848 | 1436 | ssize_t kernel_list_events(struct lttng_event **events) |
2ef84c95 | 1437 | { |
53efb85a | 1438 | int fd, ret; |
9f19cc17 DG |
1439 | char *event; |
1440 | size_t nbmem, count = 0; | |
2ef84c95 | 1441 | FILE *fp; |
9f19cc17 | 1442 | struct lttng_event *elist; |
2ef84c95 | 1443 | |
0525e9ae DG |
1444 | assert(events); |
1445 | ||
7d268848 | 1446 | fd = kernctl_tracepoint_list(kernel_tracer_fd); |
2ef84c95 | 1447 | if (fd < 0) { |
df0f840b | 1448 | PERROR("kernel tracepoint list"); |
2ef84c95 DG |
1449 | goto error; |
1450 | } | |
1451 | ||
1452 | fp = fdopen(fd, "r"); | |
1453 | if (fp == NULL) { | |
df0f840b | 1454 | PERROR("kernel tracepoint list fdopen"); |
61b73b12 | 1455 | goto error_fp; |
2ef84c95 DG |
1456 | } |
1457 | ||
1458 | /* | |
1459 | * Init memory size counter | |
1460 | * See kernel-ctl.h for explanation of this value | |
1461 | */ | |
6725fe19 | 1462 | nbmem = KERNEL_EVENT_INIT_LIST_SIZE; |
ba7f0ae5 | 1463 | elist = zmalloc(sizeof(struct lttng_event) * nbmem); |
3b870559 MD |
1464 | if (elist == NULL) { |
1465 | PERROR("alloc list events"); | |
1466 | count = -ENOMEM; | |
1467 | goto end; | |
1468 | } | |
2ef84c95 | 1469 | |
53efb85a | 1470 | while (fscanf(fp, "event { name = %m[^;]; };\n", &event) == 1) { |
6725fe19 | 1471 | if (count >= nbmem) { |
3b870559 | 1472 | struct lttng_event *new_elist; |
53efb85a | 1473 | size_t new_nbmem; |
3b870559 | 1474 | |
53efb85a MD |
1475 | new_nbmem = nbmem << 1; |
1476 | DBG("Reallocating event list from %zu to %zu bytes", | |
1477 | nbmem, new_nbmem); | |
1478 | new_elist = realloc(elist, new_nbmem * sizeof(struct lttng_event)); | |
3b870559 | 1479 | if (new_elist == NULL) { |
df0f840b | 1480 | PERROR("realloc list events"); |
3b870559 MD |
1481 | free(event); |
1482 | free(elist); | |
61b73b12 MD |
1483 | count = -ENOMEM; |
1484 | goto end; | |
2ef84c95 | 1485 | } |
53efb85a MD |
1486 | /* Zero the new memory */ |
1487 | memset(new_elist + nbmem, 0, | |
1488 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); | |
1489 | nbmem = new_nbmem; | |
3b870559 | 1490 | elist = new_elist; |
2ef84c95 | 1491 | } |
99497cd0 MD |
1492 | strncpy(elist[count].name, event, LTTNG_SYMBOL_NAME_LEN); |
1493 | elist[count].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
67b9d018 | 1494 | elist[count].enabled = -1; |
9f19cc17 | 1495 | count++; |
3b870559 | 1496 | free(event); |
2ef84c95 DG |
1497 | } |
1498 | ||
9f19cc17 | 1499 | *events = elist; |
ced2f820 | 1500 | DBG("Kernel list events done (%zu events)", count); |
61b73b12 | 1501 | end: |
799e2c4f MD |
1502 | ret = fclose(fp); /* closes both fp and fd */ |
1503 | if (ret) { | |
1504 | PERROR("fclose"); | |
1505 | } | |
9f19cc17 | 1506 | return count; |
2ef84c95 | 1507 | |
61b73b12 | 1508 | error_fp: |
799e2c4f MD |
1509 | ret = close(fd); |
1510 | if (ret) { | |
1511 | PERROR("close"); | |
1512 | } | |
2ef84c95 DG |
1513 | error: |
1514 | return -1; | |
1515 | } | |
096102bd DG |
1516 | |
1517 | /* | |
1518 | * Get kernel version and validate it. | |
1519 | */ | |
2d6bae7e FD |
1520 | int kernel_validate_version(struct lttng_kernel_abi_tracer_version *version, |
1521 | struct lttng_kernel_abi_tracer_abi_version *abi_version) | |
096102bd DG |
1522 | { |
1523 | int ret; | |
096102bd | 1524 | |
7d268848 | 1525 | ret = kernctl_tracer_version(kernel_tracer_fd, version); |
096102bd | 1526 | if (ret < 0) { |
521dd134 | 1527 | ERR("Failed to retrieve the lttng-modules version"); |
096102bd DG |
1528 | goto error; |
1529 | } | |
1530 | ||
1531 | /* Validate version */ | |
88076e89 | 1532 | if (version->major != VERSION_MAJOR) { |
c052142c | 1533 | ERR("Kernel tracer major version (%d) is not compatible with lttng-tools major version (%d)", |
88076e89 | 1534 | version->major, VERSION_MAJOR); |
096102bd | 1535 | goto error_version; |
096102bd | 1536 | } |
7d268848 | 1537 | ret = kernctl_tracer_abi_version(kernel_tracer_fd, abi_version); |
c052142c | 1538 | if (ret < 0) { |
521dd134 | 1539 | ERR("Failed to retrieve lttng-modules ABI version"); |
c052142c MD |
1540 | goto error; |
1541 | } | |
2d6bae7e | 1542 | if (abi_version->major != LTTNG_KERNEL_ABI_MAJOR_VERSION) { |
521dd134 | 1543 | ERR("Kernel tracer ABI version (%d.%d) does not match the expected ABI major version (%d.*)", |
88076e89 | 1544 | abi_version->major, abi_version->minor, |
2d6bae7e | 1545 | LTTNG_KERNEL_ABI_MAJOR_VERSION); |
c052142c MD |
1546 | goto error; |
1547 | } | |
1548 | DBG2("Kernel tracer version validated (%d.%d, ABI %d.%d)", | |
88076e89 JD |
1549 | version->major, version->minor, |
1550 | abi_version->major, abi_version->minor); | |
096102bd DG |
1551 | return 0; |
1552 | ||
1553 | error_version: | |
096102bd DG |
1554 | ret = -1; |
1555 | ||
1556 | error: | |
521dd134 | 1557 | ERR("Kernel tracer version check failed; kernel tracing will not be available"); |
096102bd DG |
1558 | return ret; |
1559 | } | |
335a95b7 MD |
1560 | |
1561 | /* | |
1562 | * Kernel work-arounds called at the start of sessiond main(). | |
1563 | */ | |
1564 | int init_kernel_workarounds(void) | |
1565 | { | |
8936c33a | 1566 | int ret; |
335a95b7 MD |
1567 | FILE *fp; |
1568 | ||
1569 | /* | |
1570 | * boot_id needs to be read once before being used concurrently | |
1571 | * to deal with a Linux kernel race. A fix is proposed for | |
1572 | * upstream, but the work-around is needed for older kernels. | |
1573 | */ | |
1574 | fp = fopen("/proc/sys/kernel/random/boot_id", "r"); | |
1575 | if (!fp) { | |
1576 | goto end_boot_id; | |
1577 | } | |
1578 | while (!feof(fp)) { | |
1579 | char buf[37] = ""; | |
1580 | ||
8936c33a DG |
1581 | ret = fread(buf, 1, sizeof(buf), fp); |
1582 | if (ret < 0) { | |
1583 | /* Ignore error, we don't really care */ | |
1584 | } | |
335a95b7 | 1585 | } |
799e2c4f MD |
1586 | ret = fclose(fp); |
1587 | if (ret) { | |
1588 | PERROR("fclose"); | |
1589 | } | |
335a95b7 | 1590 | end_boot_id: |
335a95b7 MD |
1591 | return 0; |
1592 | } | |
2f77fc4b DG |
1593 | |
1594 | /* | |
d070c424 | 1595 | * Teardown of a kernel session, keeping data required by destroy notifiers. |
2f77fc4b DG |
1596 | */ |
1597 | void kernel_destroy_session(struct ltt_kernel_session *ksess) | |
1598 | { | |
82b69413 JG |
1599 | struct lttng_trace_chunk *trace_chunk; |
1600 | ||
2f77fc4b DG |
1601 | if (ksess == NULL) { |
1602 | DBG3("No kernel session when tearing down session"); | |
1603 | return; | |
1604 | } | |
1605 | ||
1606 | DBG("Tearing down kernel session"); | |
82b69413 | 1607 | trace_chunk = ksess->current_trace_chunk; |
2f77fc4b | 1608 | |
07b86b52 | 1609 | /* |
15dc512a DG |
1610 | * Destroy channels on the consumer if at least one FD has been sent and we |
1611 | * are in no output mode because the streams are in *no* monitor mode so we | |
1612 | * have to send a command to clean them up or else they leaked. | |
07b86b52 | 1613 | */ |
15dc512a | 1614 | if (!ksess->output_traces && ksess->consumer_fds_sent) { |
07b86b52 JD |
1615 | int ret; |
1616 | struct consumer_socket *socket; | |
1617 | struct lttng_ht_iter iter; | |
1618 | ||
1619 | /* For each consumer socket. */ | |
d069d577 | 1620 | rcu_read_lock(); |
07b86b52 JD |
1621 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, |
1622 | socket, node.node) { | |
1623 | struct ltt_kernel_channel *chan; | |
1624 | ||
1625 | /* For each channel, ask the consumer to destroy it. */ | |
1626 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { | |
1627 | ret = kernel_consumer_destroy_channel(socket, chan); | |
1628 | if (ret < 0) { | |
1629 | /* Consumer is probably dead. Use next socket. */ | |
1630 | continue; | |
1631 | } | |
1632 | } | |
1633 | } | |
d069d577 | 1634 | rcu_read_unlock(); |
07b86b52 JD |
1635 | } |
1636 | ||
2f77fc4b DG |
1637 | /* Close any relayd session */ |
1638 | consumer_output_send_destroy_relayd(ksess->consumer); | |
1639 | ||
1640 | trace_kernel_destroy_session(ksess); | |
82b69413 | 1641 | lttng_trace_chunk_put(trace_chunk); |
2f77fc4b | 1642 | } |
fb5f35b6 | 1643 | |
d070c424 MD |
1644 | /* Teardown of data required by destroy notifiers. */ |
1645 | void kernel_free_session(struct ltt_kernel_session *ksess) | |
1646 | { | |
1647 | if (ksess == NULL) { | |
1648 | return; | |
1649 | } | |
1650 | trace_kernel_free_session(ksess); | |
1651 | } | |
1652 | ||
fb5f35b6 DG |
1653 | /* |
1654 | * Destroy a kernel channel object. It does not do anything on the tracer side. | |
1655 | */ | |
1656 | void kernel_destroy_channel(struct ltt_kernel_channel *kchan) | |
1657 | { | |
1658 | struct ltt_kernel_session *ksess = NULL; | |
1659 | ||
1660 | assert(kchan); | |
1661 | assert(kchan->channel); | |
1662 | ||
1663 | DBG3("Kernel destroy channel %s", kchan->channel->name); | |
1664 | ||
1665 | /* Update channel count of associated session. */ | |
1666 | if (kchan->session) { | |
1667 | /* Keep pointer reference so we can update it after the destroy. */ | |
1668 | ksess = kchan->session; | |
1669 | } | |
1670 | ||
1671 | trace_kernel_destroy_channel(kchan); | |
1672 | ||
1673 | /* | |
1674 | * At this point the kernel channel is not visible anymore. This is safe | |
1675 | * since in order to work on a visible kernel session, the tracing session | |
1676 | * lock (ltt_session.lock) MUST be acquired. | |
1677 | */ | |
1678 | if (ksess) { | |
1679 | ksess->channel_count--; | |
1680 | } | |
1681 | } | |
6dc3064a DG |
1682 | |
1683 | /* | |
1684 | * Take a snapshot for a given kernel session. | |
1685 | * | |
9a654598 | 1686 | * Return LTTNG_OK on success or else return a LTTNG_ERR code. |
6dc3064a | 1687 | */ |
fb9a95c4 JG |
1688 | enum lttng_error_code kernel_snapshot_record( |
1689 | struct ltt_kernel_session *ksess, | |
348a81dc | 1690 | const struct consumer_output *output, int wait, |
d07ceecd | 1691 | uint64_t nb_packets_per_stream) |
6dc3064a | 1692 | { |
2a06df8d | 1693 | int err, ret, saved_metadata_fd; |
9a654598 | 1694 | enum lttng_error_code status = LTTNG_OK; |
6dc3064a DG |
1695 | struct consumer_socket *socket; |
1696 | struct lttng_ht_iter iter; | |
1697 | struct ltt_kernel_metadata *saved_metadata; | |
3b967712 | 1698 | char *trace_path = NULL; |
5da88b0f | 1699 | size_t consumer_path_offset = 0; |
6dc3064a DG |
1700 | |
1701 | assert(ksess); | |
1702 | assert(ksess->consumer); | |
1703 | assert(output); | |
1704 | ||
1705 | DBG("Kernel snapshot record started"); | |
1706 | ||
1707 | /* Save current metadata since the following calls will change it. */ | |
1708 | saved_metadata = ksess->metadata; | |
1709 | saved_metadata_fd = ksess->metadata_stream_fd; | |
1710 | ||
1711 | rcu_read_lock(); | |
1712 | ||
1713 | ret = kernel_open_metadata(ksess); | |
1714 | if (ret < 0) { | |
9a654598 | 1715 | status = LTTNG_ERR_KERN_META_FAIL; |
6dc3064a DG |
1716 | goto error; |
1717 | } | |
1718 | ||
1719 | ret = kernel_open_metadata_stream(ksess); | |
1720 | if (ret < 0) { | |
9a654598 | 1721 | status = LTTNG_ERR_KERN_META_FAIL; |
6dc3064a DG |
1722 | goto error_open_stream; |
1723 | } | |
1724 | ||
3b967712 | 1725 | trace_path = setup_channel_trace_path(ksess->consumer, |
e4061179 | 1726 | "", &consumer_path_offset); |
3b967712 MD |
1727 | if (!trace_path) { |
1728 | status = LTTNG_ERR_INVALID; | |
1729 | goto error; | |
1730 | } | |
6dc3064a | 1731 | /* Send metadata to consumer and snapshot everything. */ |
348a81dc | 1732 | cds_lfht_for_each_entry(output->socks->ht, &iter.iter, |
6dc3064a | 1733 | socket, node.node) { |
6dc3064a | 1734 | struct ltt_kernel_channel *chan; |
6dc3064a | 1735 | |
6dc3064a DG |
1736 | pthread_mutex_lock(socket->lock); |
1737 | /* This stream must not be monitored by the consumer. */ | |
07b86b52 | 1738 | ret = kernel_consumer_add_metadata(socket, ksess, 0); |
6dc3064a | 1739 | pthread_mutex_unlock(socket->lock); |
6dc3064a | 1740 | if (ret < 0) { |
0ed78e50 | 1741 | status = LTTNG_ERR_KERN_META_FAIL; |
6dc3064a DG |
1742 | goto error_consumer; |
1743 | } | |
1744 | ||
1745 | /* For each channel, ask the consumer to snapshot it. */ | |
1746 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { | |
9a654598 | 1747 | status = consumer_snapshot_channel(socket, chan->key, output, 0, |
5c786ded | 1748 | ksess->uid, ksess->gid, |
5da88b0f | 1749 | &trace_path[consumer_path_offset], wait, |
d2956687 | 1750 | nb_packets_per_stream); |
9a654598 | 1751 | if (status != LTTNG_OK) { |
2a06df8d DG |
1752 | (void) kernel_consumer_destroy_metadata(socket, |
1753 | ksess->metadata); | |
6dc3064a DG |
1754 | goto error_consumer; |
1755 | } | |
1756 | } | |
1757 | ||
1758 | /* Snapshot metadata, */ | |
9a654598 | 1759 | status = consumer_snapshot_channel(socket, ksess->metadata->key, output, |
5da88b0f MD |
1760 | 1, ksess->uid, ksess->gid, &trace_path[consumer_path_offset], |
1761 | wait, 0); | |
9a654598 | 1762 | if (status != LTTNG_OK) { |
6dc3064a DG |
1763 | goto error_consumer; |
1764 | } | |
07b86b52 JD |
1765 | |
1766 | /* | |
1767 | * The metadata snapshot is done, ask the consumer to destroy it since | |
1768 | * it's not monitored on the consumer side. | |
1769 | */ | |
1770 | (void) kernel_consumer_destroy_metadata(socket, ksess->metadata); | |
6dc3064a DG |
1771 | } |
1772 | ||
1773 | error_consumer: | |
1774 | /* Close newly opened metadata stream. It's now on the consumer side. */ | |
2a06df8d DG |
1775 | err = close(ksess->metadata_stream_fd); |
1776 | if (err < 0) { | |
6dc3064a DG |
1777 | PERROR("close snapshot kernel"); |
1778 | } | |
1779 | ||
1780 | error_open_stream: | |
1781 | trace_kernel_destroy_metadata(ksess->metadata); | |
1782 | error: | |
1783 | /* Restore metadata state.*/ | |
1784 | ksess->metadata = saved_metadata; | |
1785 | ksess->metadata_stream_fd = saved_metadata_fd; | |
6dc3064a | 1786 | rcu_read_unlock(); |
3b967712 | 1787 | free(trace_path); |
9a654598 | 1788 | return status; |
6dc3064a | 1789 | } |
834978fd DG |
1790 | |
1791 | /* | |
1792 | * Get the syscall mask array from the kernel tracer. | |
1793 | * | |
1794 | * Return 0 on success else a negative value. In both case, syscall_mask should | |
1795 | * be freed. | |
1796 | */ | |
1797 | int kernel_syscall_mask(int chan_fd, char **syscall_mask, uint32_t *nr_bits) | |
1798 | { | |
1799 | assert(syscall_mask); | |
1800 | assert(nr_bits); | |
1801 | ||
1802 | return kernctl_syscall_mask(chan_fd, syscall_mask, nr_bits); | |
1803 | } | |
6e21424e | 1804 | |
959e3c66 JR |
1805 | static |
1806 | int kernel_tracer_abi_greater_or_equal(unsigned int major, unsigned int minor) | |
6e21424e | 1807 | { |
959e3c66 | 1808 | int ret; |
2d6bae7e | 1809 | struct lttng_kernel_abi_tracer_abi_version abi; |
6e21424e | 1810 | |
7d268848 | 1811 | ret = kernctl_tracer_abi_version(kernel_tracer_fd, &abi); |
6e21424e JR |
1812 | if (ret < 0) { |
1813 | ERR("Failed to retrieve lttng-modules ABI version"); | |
1814 | goto error; | |
1815 | } | |
1816 | ||
959e3c66 JR |
1817 | ret = abi.major > major || (abi.major == major && abi.minor >= minor); |
1818 | error: | |
1819 | return ret; | |
1820 | } | |
1821 | ||
1822 | /* | |
1823 | * Check for the support of the RING_BUFFER_SNAPSHOT_SAMPLE_POSITIONS via abi | |
1824 | * version number. | |
1825 | * | |
1826 | * Return 1 on success, 0 when feature is not supported, negative value in case | |
1827 | * of errors. | |
1828 | */ | |
1829 | int kernel_supports_ring_buffer_snapshot_sample_positions(void) | |
1830 | { | |
6e21424e JR |
1831 | /* |
1832 | * RING_BUFFER_SNAPSHOT_SAMPLE_POSITIONS was introduced in 2.3 | |
1833 | */ | |
959e3c66 | 1834 | return kernel_tracer_abi_greater_or_equal(2, 3); |
6e21424e | 1835 | } |
5c408ad8 | 1836 | |
a40a503f MD |
1837 | /* |
1838 | * Check for the support of the packet sequence number via abi version number. | |
1839 | * | |
1840 | * Return 1 on success, 0 when feature is not supported, negative value in case | |
1841 | * of errors. | |
1842 | */ | |
1843 | int kernel_supports_ring_buffer_packet_sequence_number(void) | |
1844 | { | |
a40a503f | 1845 | /* |
3029bc92 JG |
1846 | * Packet sequence number was introduced in LTTng 2.8, |
1847 | * lttng-modules ABI 2.1. | |
a40a503f | 1848 | */ |
959e3c66 JR |
1849 | return kernel_tracer_abi_greater_or_equal(2, 1); |
1850 | } | |
1851 | ||
1852 | /* | |
1853 | * Check for the support of event notifiers via abi version number. | |
1854 | * | |
1855 | * Return 1 on success, 0 when feature is not supported, negative value in case | |
1856 | * of errors. | |
1857 | */ | |
1858 | int kernel_supports_event_notifiers(void) | |
1859 | { | |
1860 | /* | |
1861 | * Event notifiers were introduced in LTTng 2.13, lttng-modules ABI 2.6. | |
1862 | */ | |
1863 | return kernel_tracer_abi_greater_or_equal(2, 6); | |
a40a503f MD |
1864 | } |
1865 | ||
5c408ad8 JD |
1866 | /* |
1867 | * Rotate a kernel session. | |
1868 | * | |
d5a1b7aa | 1869 | * Return LTTNG_OK on success or else an LTTng error code. |
5c408ad8 | 1870 | */ |
d5a1b7aa | 1871 | enum lttng_error_code kernel_rotate_session(struct ltt_session *session) |
5c408ad8 JD |
1872 | { |
1873 | int ret; | |
d5a1b7aa | 1874 | enum lttng_error_code status = LTTNG_OK; |
5c408ad8 JD |
1875 | struct consumer_socket *socket; |
1876 | struct lttng_ht_iter iter; | |
1877 | struct ltt_kernel_session *ksess = session->kernel_session; | |
1878 | ||
1879 | assert(ksess); | |
1880 | assert(ksess->consumer); | |
1881 | ||
1882 | DBG("Rotate kernel session %s started (session %" PRIu64 ")", | |
1883 | session->name, session->id); | |
1884 | ||
1885 | rcu_read_lock(); | |
1886 | ||
1887 | /* | |
1888 | * Note that this loop will end after one iteration given that there is | |
1889 | * only one kernel consumer. | |
1890 | */ | |
1891 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, | |
1892 | socket, node.node) { | |
1893 | struct ltt_kernel_channel *chan; | |
1894 | ||
b8a1b0bd | 1895 | /* For each channel, ask the consumer to rotate it. */ |
5c408ad8 | 1896 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { |
92816cc3 JG |
1897 | DBG("Rotate kernel channel %" PRIu64 ", session %s", |
1898 | chan->key, session->name); | |
5c408ad8 JD |
1899 | ret = consumer_rotate_channel(socket, chan->key, |
1900 | ksess->uid, ksess->gid, ksess->consumer, | |
d2956687 | 1901 | /* is_metadata_channel */ false); |
5c408ad8 | 1902 | if (ret < 0) { |
7e0de219 | 1903 | status = LTTNG_ERR_ROTATION_FAIL_CONSUMER; |
5c408ad8 JD |
1904 | goto error; |
1905 | } | |
1906 | } | |
1907 | ||
1908 | /* | |
1909 | * Rotate the metadata channel. | |
1910 | */ | |
22a1b931 | 1911 | ret = consumer_rotate_channel(socket, ksess->metadata->key, |
5c408ad8 | 1912 | ksess->uid, ksess->gid, ksess->consumer, |
d2956687 | 1913 | /* is_metadata_channel */ true); |
5c408ad8 | 1914 | if (ret < 0) { |
7e0de219 | 1915 | status = LTTNG_ERR_ROTATION_FAIL_CONSUMER; |
5c408ad8 JD |
1916 | goto error; |
1917 | } | |
1918 | } | |
1919 | ||
5c408ad8 JD |
1920 | error: |
1921 | rcu_read_unlock(); | |
d5a1b7aa | 1922 | return status; |
5c408ad8 | 1923 | } |
d2956687 JG |
1924 | |
1925 | enum lttng_error_code kernel_create_channel_subdirectories( | |
1926 | const struct ltt_kernel_session *ksess) | |
1927 | { | |
1928 | enum lttng_error_code ret = LTTNG_OK; | |
1929 | enum lttng_trace_chunk_status chunk_status; | |
1930 | ||
1931 | rcu_read_lock(); | |
1932 | assert(ksess->current_trace_chunk); | |
1933 | ||
1934 | /* | |
1935 | * Create the index subdirectory which will take care | |
1936 | * of implicitly creating the channel's path. | |
1937 | */ | |
1938 | chunk_status = lttng_trace_chunk_create_subdirectory( | |
1939 | ksess->current_trace_chunk, | |
1940 | DEFAULT_KERNEL_TRACE_DIR "/" DEFAULT_INDEX_DIR); | |
1941 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
1942 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
1943 | goto error; | |
1944 | } | |
1945 | error: | |
1946 | rcu_read_unlock(); | |
1947 | return ret; | |
1948 | } | |
7d268848 MD |
1949 | |
1950 | /* | |
1951 | * Setup necessary data for kernel tracer action. | |
1952 | */ | |
1953 | LTTNG_HIDDEN | |
1954 | int init_kernel_tracer(void) | |
1955 | { | |
1956 | int ret; | |
1957 | bool is_root = !getuid(); | |
1958 | ||
1959 | /* Modprobe lttng kernel modules */ | |
1960 | ret = modprobe_lttng_control(); | |
1961 | if (ret < 0) { | |
1962 | goto error; | |
1963 | } | |
1964 | ||
1965 | /* Open debugfs lttng */ | |
1966 | kernel_tracer_fd = open(module_proc_lttng, O_RDWR); | |
1967 | if (kernel_tracer_fd < 0) { | |
1968 | DBG("Failed to open %s", module_proc_lttng); | |
1969 | goto error_open; | |
1970 | } | |
1971 | ||
1972 | /* Validate kernel version */ | |
412d7227 SM |
1973 | ret = kernel_validate_version(&the_kernel_tracer_version, |
1974 | &the_kernel_tracer_abi_version); | |
7d268848 MD |
1975 | if (ret < 0) { |
1976 | goto error_version; | |
1977 | } | |
1978 | ||
1979 | ret = modprobe_lttng_data(); | |
1980 | if (ret < 0) { | |
1981 | goto error_modules; | |
1982 | } | |
1983 | ||
1984 | ret = kernel_supports_ring_buffer_snapshot_sample_positions(); | |
1985 | if (ret < 0) { | |
1986 | goto error_modules; | |
1987 | } | |
7d268848 MD |
1988 | if (ret < 1) { |
1989 | WARN("Kernel tracer does not support buffer monitoring. " | |
1990 | "The monitoring timer of channels in the kernel domain " | |
1991 | "will be set to 0 (disabled)."); | |
1992 | } | |
1993 | ||
352b58f5 JR |
1994 | ret = kernel_supports_event_notifiers(); |
1995 | if (ret < 0) { | |
1996 | ERR("Failed to check for kernel tracer event notifier support"); | |
1997 | goto error_modules; | |
1998 | } | |
1999 | ret = kernel_create_event_notifier_group(&kernel_tracer_event_notifier_group_fd); | |
2000 | if (ret < 0) { | |
2001 | /* This is not fatal. */ | |
2002 | WARN("Failed to create kernel event notifier group"); | |
2003 | kernel_tracer_event_notifier_group_fd = -1; | |
2004 | } else { | |
90aa04a1 FD |
2005 | enum event_notifier_error_accounting_status error_accounting_status; |
2006 | enum lttng_error_code error_code_ret = | |
352b58f5 JR |
2007 | kernel_create_event_notifier_group_notification_fd( |
2008 | &kernel_tracer_event_notifier_group_notification_fd); | |
2009 | ||
2010 | if (error_code_ret != LTTNG_OK) { | |
2011 | goto error_modules; | |
2012 | } | |
2013 | ||
90aa04a1 FD |
2014 | error_accounting_status = event_notifier_error_accounting_register_kernel( |
2015 | kernel_tracer_event_notifier_group_fd); | |
2016 | if (error_accounting_status != EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK) { | |
2017 | ERR("Failed to initialize event notifier error accounting for kernel tracer"); | |
2018 | error_code_ret = LTTNG_ERR_EVENT_NOTIFIER_ERROR_ACCOUNTING; | |
2019 | goto error_modules; | |
2020 | } | |
2021 | ||
352b58f5 JR |
2022 | kernel_token_to_event_notifier_rule_ht = cds_lfht_new( |
2023 | DEFAULT_HT_SIZE, 1, 0, | |
2024 | CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, | |
2025 | NULL); | |
2026 | if (!kernel_token_to_event_notifier_rule_ht) { | |
2027 | goto error_token_ht; | |
2028 | } | |
2029 | } | |
2030 | ||
2031 | DBG("Kernel tracer initialized: kernel tracer fd = %d, event notifier group fd = %d, event notifier group notification fd = %d", | |
2032 | kernel_tracer_fd, kernel_tracer_event_notifier_group_fd, | |
2033 | kernel_tracer_event_notifier_group_notification_fd); | |
7d268848 MD |
2034 | |
2035 | ret = syscall_init_table(kernel_tracer_fd); | |
2036 | if (ret < 0) { | |
2037 | ERR("Unable to populate syscall table. Syscall tracing won't " | |
2038 | "work for this session daemon."); | |
2039 | } | |
352b58f5 | 2040 | |
7d268848 MD |
2041 | return 0; |
2042 | ||
2043 | error_version: | |
2044 | modprobe_remove_lttng_control(); | |
2045 | ret = close(kernel_tracer_fd); | |
2046 | if (ret) { | |
352b58f5 JR |
2047 | PERROR("Failed to close kernel tracer file descriptor: fd = %d", |
2048 | kernel_tracer_fd); | |
7d268848 | 2049 | } |
6dcf80d3 | 2050 | |
7d268848 MD |
2051 | kernel_tracer_fd = -1; |
2052 | return LTTNG_ERR_KERN_VERSION; | |
2053 | ||
352b58f5 JR |
2054 | |
2055 | error_token_ht: | |
2056 | ret = close(kernel_tracer_event_notifier_group_notification_fd); | |
2057 | if (ret) { | |
2058 | PERROR("Failed to close kernel tracer event notifier group notification file descriptor: fd = %d", | |
2059 | kernel_tracer_event_notifier_group_notification_fd); | |
2060 | } | |
2061 | ||
6dcf80d3 JG |
2062 | kernel_tracer_event_notifier_group_notification_fd = -1; |
2063 | ||
7d268848 | 2064 | error_modules: |
352b58f5 JR |
2065 | ret = close(kernel_tracer_event_notifier_group_fd); |
2066 | if (ret) { | |
2067 | PERROR("Failed to close kernel tracer event notifier group file descriptor: fd = %d", | |
2068 | kernel_tracer_event_notifier_group_fd); | |
2069 | } | |
2070 | ||
6dcf80d3 JG |
2071 | kernel_tracer_event_notifier_group_fd = -1; |
2072 | ||
7d268848 MD |
2073 | ret = close(kernel_tracer_fd); |
2074 | if (ret) { | |
352b58f5 JR |
2075 | PERROR("Failed to close kernel tracer file descriptor: fd = %d", |
2076 | kernel_tracer_fd); | |
7d268848 MD |
2077 | } |
2078 | ||
6dcf80d3 JG |
2079 | kernel_tracer_fd = -1; |
2080 | ||
7d268848 MD |
2081 | error_open: |
2082 | modprobe_remove_lttng_control(); | |
2083 | ||
2084 | error: | |
2085 | WARN("No kernel tracer available"); | |
2086 | kernel_tracer_fd = -1; | |
2087 | if (!is_root) { | |
2088 | return LTTNG_ERR_NEED_ROOT_SESSIOND; | |
2089 | } else { | |
2090 | return LTTNG_ERR_KERN_NA; | |
2091 | } | |
2092 | } | |
2093 | ||
2094 | LTTNG_HIDDEN | |
2095 | void cleanup_kernel_tracer(void) | |
2096 | { | |
352b58f5 JR |
2097 | DBG2("Closing kernel event notifier group notification file descriptor"); |
2098 | if (kernel_tracer_event_notifier_group_notification_fd >= 0) { | |
b69a1b40 | 2099 | int ret = notification_thread_command_remove_tracer_event_source( |
412d7227 | 2100 | the_notification_thread_handle, |
352b58f5 JR |
2101 | kernel_tracer_event_notifier_group_notification_fd); |
2102 | if (ret != LTTNG_OK) { | |
2103 | ERR("Failed to remove kernel event notifier notification from notification thread"); | |
2104 | } | |
2105 | ||
2106 | ret = close(kernel_tracer_event_notifier_group_notification_fd); | |
2107 | if (ret) { | |
2108 | PERROR("Failed to close kernel event notifier group notification file descriptor: fd = %d", | |
2109 | kernel_tracer_event_notifier_group_notification_fd); | |
2110 | } | |
2111 | ||
2112 | kernel_tracer_event_notifier_group_notification_fd = -1; | |
2113 | } | |
2114 | ||
2115 | if (kernel_token_to_event_notifier_rule_ht) { | |
b69a1b40 JG |
2116 | const int ret = cds_lfht_destroy( |
2117 | kernel_token_to_event_notifier_rule_ht, NULL); | |
352b58f5 JR |
2118 | assert(ret == 0); |
2119 | } | |
2120 | ||
2121 | DBG2("Closing kernel event notifier group file descriptor"); | |
2122 | if (kernel_tracer_event_notifier_group_fd >= 0) { | |
b69a1b40 JG |
2123 | const int ret = close(kernel_tracer_event_notifier_group_fd); |
2124 | ||
352b58f5 JR |
2125 | if (ret) { |
2126 | PERROR("Failed to close kernel event notifier group file descriptor: fd = %d", | |
2127 | kernel_tracer_event_notifier_group_fd); | |
2128 | } | |
2129 | ||
2130 | kernel_tracer_event_notifier_group_fd = -1; | |
2131 | } | |
7d268848 MD |
2132 | |
2133 | DBG2("Closing kernel fd"); | |
2134 | if (kernel_tracer_fd >= 0) { | |
b69a1b40 JG |
2135 | const int ret = close(kernel_tracer_fd); |
2136 | ||
7d268848 | 2137 | if (ret) { |
352b58f5 JR |
2138 | PERROR("Failed to close kernel tracer file descriptor: fd = %d", |
2139 | kernel_tracer_fd); | |
7d268848 | 2140 | } |
352b58f5 | 2141 | |
7d268848 MD |
2142 | kernel_tracer_fd = -1; |
2143 | } | |
352b58f5 | 2144 | |
7d268848 MD |
2145 | free(syscall_table); |
2146 | } | |
2147 | ||
2148 | LTTNG_HIDDEN | |
2149 | bool kernel_tracer_is_initialized(void) | |
2150 | { | |
2151 | return kernel_tracer_fd >= 0; | |
2152 | } | |
bca212a2 MD |
2153 | |
2154 | /* | |
2155 | * Clear a kernel session. | |
2156 | * | |
2157 | * Return LTTNG_OK on success or else an LTTng error code. | |
2158 | */ | |
2159 | enum lttng_error_code kernel_clear_session(struct ltt_session *session) | |
2160 | { | |
2161 | int ret; | |
2162 | enum lttng_error_code status = LTTNG_OK; | |
2163 | struct consumer_socket *socket; | |
2164 | struct lttng_ht_iter iter; | |
2165 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2166 | ||
2167 | assert(ksess); | |
2168 | assert(ksess->consumer); | |
2169 | ||
2170 | DBG("Clear kernel session %s (session %" PRIu64 ")", | |
2171 | session->name, session->id); | |
2172 | ||
2173 | rcu_read_lock(); | |
2174 | ||
2175 | if (ksess->active) { | |
2176 | ERR("Expecting inactive session %s (%" PRIu64 ")", session->name, session->id); | |
2177 | status = LTTNG_ERR_FATAL; | |
2178 | goto end; | |
2179 | } | |
2180 | ||
2181 | /* | |
2182 | * Note that this loop will end after one iteration given that there is | |
2183 | * only one kernel consumer. | |
2184 | */ | |
2185 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, | |
2186 | socket, node.node) { | |
2187 | struct ltt_kernel_channel *chan; | |
2188 | ||
2189 | /* For each channel, ask the consumer to clear it. */ | |
2190 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { | |
2191 | DBG("Clear kernel channel %" PRIu64 ", session %s", | |
2192 | chan->key, session->name); | |
2193 | ret = consumer_clear_channel(socket, chan->key); | |
2194 | if (ret < 0) { | |
2195 | goto error; | |
2196 | } | |
2197 | } | |
2198 | ||
2199 | if (!ksess->metadata) { | |
2200 | /* | |
2201 | * Nothing to do for the metadata. | |
2202 | * This is a snapshot session. | |
2203 | * The metadata is genererated on the fly. | |
2204 | */ | |
2205 | continue; | |
2206 | } | |
2207 | ||
2208 | /* | |
2209 | * Clear the metadata channel. | |
2210 | * Metadata channel is not cleared per se but we still need to | |
2211 | * perform a rotation operation on it behind the scene. | |
2212 | */ | |
2213 | ret = consumer_clear_channel(socket, ksess->metadata->key); | |
2214 | if (ret < 0) { | |
2215 | goto error; | |
2216 | } | |
2217 | } | |
2218 | ||
2219 | goto end; | |
2220 | error: | |
2221 | switch (-ret) { | |
2222 | case LTTCOMM_CONSUMERD_RELAYD_CLEAR_DISALLOWED: | |
2223 | status = LTTNG_ERR_CLEAR_RELAY_DISALLOWED; | |
2224 | break; | |
2225 | default: | |
2226 | status = LTTNG_ERR_CLEAR_FAIL_CONSUMER; | |
2227 | break; | |
2228 | } | |
2229 | end: | |
2230 | rcu_read_unlock(); | |
2231 | return status; | |
2232 | } | |
352b58f5 JR |
2233 | |
2234 | enum lttng_error_code kernel_create_event_notifier_group_notification_fd( | |
2235 | int *event_notifier_group_notification_fd) | |
2236 | { | |
2237 | int local_fd = -1, ret; | |
2238 | enum lttng_error_code error_code_ret; | |
2239 | ||
2240 | assert(event_notifier_group_notification_fd); | |
2241 | ||
2242 | ret = kernctl_create_event_notifier_group_notification_fd( | |
2243 | kernel_tracer_event_notifier_group_fd); | |
2244 | if (ret < 0) { | |
2245 | PERROR("Failed to create kernel event notifier group notification file descriptor"); | |
2246 | error_code_ret = LTTNG_ERR_EVENT_NOTIFIER_GROUP_NOTIFICATION_FD; | |
2247 | goto error; | |
2248 | } | |
2249 | ||
2250 | local_fd = ret; | |
2251 | ||
2252 | /* Prevent fd duplication after execlp(). */ | |
2253 | ret = fcntl(local_fd, F_SETFD, FD_CLOEXEC); | |
2254 | if (ret < 0) { | |
2255 | PERROR("Failed to set FD_CLOEXEC on kernel event notifier group notification file descriptor: fd = %d", | |
2256 | local_fd); | |
2257 | error_code_ret = LTTNG_ERR_EVENT_NOTIFIER_GROUP_NOTIFICATION_FD; | |
2258 | goto error; | |
2259 | } | |
2260 | ||
2261 | DBG("Created kernel notifier group notification file descriptor: fd = %d", | |
2262 | local_fd); | |
2263 | error_code_ret = LTTNG_OK; | |
2264 | *event_notifier_group_notification_fd = local_fd; | |
2265 | local_fd = -1; | |
2266 | ||
2267 | error: | |
2268 | if (local_fd >= 0) { | |
2269 | ret = close(local_fd); | |
2270 | if (ret) { | |
2271 | PERROR("Failed to close kernel event notifier group notification file descriptor: fd = %d", | |
2272 | local_fd); | |
2273 | } | |
2274 | } | |
2275 | ||
2276 | return error_code_ret; | |
2277 | } | |
2278 | ||
2279 | enum lttng_error_code kernel_destroy_event_notifier_group_notification_fd( | |
2280 | int event_notifier_group_notification_fd) | |
2281 | { | |
2282 | enum lttng_error_code ret_code = LTTNG_OK; | |
2283 | ||
2284 | DBG("Closing event notifier group notification file descriptor: fd = %d", | |
2285 | event_notifier_group_notification_fd); | |
2286 | if (event_notifier_group_notification_fd >= 0) { | |
2287 | const int ret = close(event_notifier_group_notification_fd); | |
2288 | if (ret) { | |
2289 | PERROR("Failed to close event notifier group notification file descriptor: fd = %d", | |
2290 | event_notifier_group_notification_fd); | |
2291 | } | |
2292 | } | |
2293 | ||
2294 | return ret_code; | |
2295 | } | |
2296 | ||
2297 | static | |
2298 | unsigned long hash_trigger(const struct lttng_trigger *trigger) | |
2299 | { | |
2300 | const struct lttng_condition *condition = | |
2301 | lttng_trigger_get_const_condition(trigger); | |
2302 | ||
2303 | return lttng_condition_hash(condition); | |
2304 | } | |
2305 | ||
2306 | static | |
2307 | int match_trigger(struct cds_lfht_node *node, const void *key) | |
2308 | { | |
2309 | const struct ltt_kernel_event_notifier_rule *event_notifier_rule; | |
2310 | const struct lttng_trigger *trigger = key; | |
2311 | ||
2312 | event_notifier_rule = caa_container_of(node, | |
2313 | const struct ltt_kernel_event_notifier_rule, ht_node); | |
2314 | ||
2315 | return lttng_trigger_is_equal(trigger, event_notifier_rule->trigger); | |
2316 | } | |
2317 | ||
2318 | static enum lttng_error_code kernel_create_event_notifier_rule( | |
2319 | struct lttng_trigger *trigger, | |
2320 | const struct lttng_credentials *creds, uint64_t token) | |
2321 | { | |
2322 | int err, fd, ret = 0; | |
2323 | enum lttng_error_code error_code_ret; | |
2324 | enum lttng_condition_status condition_status; | |
2325 | enum lttng_condition_type condition_type; | |
2326 | enum lttng_event_rule_type event_rule_type; | |
2327 | struct ltt_kernel_event_notifier_rule *event_notifier_rule; | |
2d6bae7e | 2328 | struct lttng_kernel_abi_event_notifier kernel_event_notifier = {}; |
bbd6675c | 2329 | unsigned int capture_bytecode_count = 0, i; |
352b58f5 JR |
2330 | const struct lttng_condition *condition = NULL; |
2331 | const struct lttng_event_rule *event_rule = NULL; | |
bbd6675c | 2332 | enum lttng_condition_status cond_status; |
352b58f5 JR |
2333 | |
2334 | assert(trigger); | |
2335 | ||
2336 | condition = lttng_trigger_get_const_condition(trigger); | |
2337 | assert(condition); | |
2338 | ||
2339 | condition_type = lttng_condition_get_type(condition); | |
8dbb86b8 | 2340 | assert(condition_type == LTTNG_CONDITION_TYPE_EVENT_RULE_MATCHES); |
352b58f5 JR |
2341 | |
2342 | /* Does not acquire a reference. */ | |
8dbb86b8 | 2343 | condition_status = lttng_condition_event_rule_matches_get_rule( |
352b58f5 JR |
2344 | condition, &event_rule); |
2345 | assert(condition_status == LTTNG_CONDITION_STATUS_OK); | |
2346 | assert(event_rule); | |
2347 | ||
2348 | event_rule_type = lttng_event_rule_get_type(event_rule); | |
2349 | assert(event_rule_type != LTTNG_EVENT_RULE_TYPE_UNKNOWN); | |
2350 | ||
2351 | error_code_ret = trace_kernel_create_event_notifier_rule(trigger, token, | |
8dbb86b8 JR |
2352 | lttng_condition_event_rule_matches_get_error_counter_index( |
2353 | condition), | |
352b58f5 JR |
2354 | &event_notifier_rule); |
2355 | if (error_code_ret != LTTNG_OK) { | |
2356 | goto error; | |
2357 | } | |
2358 | ||
2359 | error_code_ret = trace_kernel_init_event_notifier_from_event_rule( | |
2360 | event_rule, &kernel_event_notifier); | |
2361 | if (error_code_ret != LTTNG_OK) { | |
b5e3b044 | 2362 | goto free_event; |
352b58f5 JR |
2363 | } |
2364 | ||
2365 | kernel_event_notifier.event.token = event_notifier_rule->token; | |
90aa04a1 | 2366 | kernel_event_notifier.error_counter_idx = |
8dbb86b8 JR |
2367 | lttng_condition_event_rule_matches_get_error_counter_index( |
2368 | condition); | |
352b58f5 JR |
2369 | |
2370 | fd = kernctl_create_event_notifier( | |
2371 | kernel_tracer_event_notifier_group_fd, | |
2372 | &kernel_event_notifier); | |
2373 | if (fd < 0) { | |
2374 | switch (-fd) { | |
2375 | case EEXIST: | |
2376 | error_code_ret = LTTNG_ERR_KERN_EVENT_EXIST; | |
2377 | break; | |
2378 | case ENOSYS: | |
2379 | WARN("Failed to create kernel event notifier: not notifier type not implemented"); | |
2380 | error_code_ret = LTTNG_ERR_KERN_EVENT_ENOSYS; | |
2381 | break; | |
2382 | case ENOENT: | |
2383 | WARN("Failed to create kernel event notifier: not found: name = '%s'", | |
2384 | kernel_event_notifier.event.name); | |
2385 | error_code_ret = LTTNG_ERR_KERN_ENABLE_FAIL; | |
2386 | break; | |
2387 | default: | |
2388 | PERROR("Failed to create kernel event notifier: error code = %d, name = '%s'", | |
2389 | fd, kernel_event_notifier.event.name); | |
2390 | error_code_ret = LTTNG_ERR_KERN_ENABLE_FAIL; | |
2391 | } | |
2392 | goto free_event; | |
2393 | } | |
2394 | ||
2395 | event_notifier_rule->fd = fd; | |
2396 | /* Prevent fd duplication after execlp(). */ | |
2397 | err = fcntl(event_notifier_rule->fd, F_SETFD, FD_CLOEXEC); | |
2398 | if (err < 0) { | |
2399 | PERROR("Failed to set FD_CLOEXEC on kernel event notifier file descriptor: fd = %d", | |
2400 | fd); | |
2401 | error_code_ret = LTTNG_ERR_FATAL; | |
2402 | goto set_cloexec_error; | |
2403 | } | |
2404 | ||
2405 | if (event_notifier_rule->filter) { | |
2406 | err = kernctl_filter(event_notifier_rule->fd, event_notifier_rule->filter); | |
2407 | if (err < 0) { | |
2408 | switch (-err) { | |
2409 | case ENOMEM: | |
2410 | error_code_ret = LTTNG_ERR_FILTER_NOMEM; | |
2411 | break; | |
2412 | default: | |
2413 | error_code_ret = LTTNG_ERR_FILTER_INVAL; | |
2414 | break; | |
2415 | } | |
2416 | goto filter_error; | |
2417 | } | |
2418 | } | |
2419 | ||
2420 | if (lttng_event_rule_get_type(event_rule) == | |
e60e9a9a | 2421 | LTTNG_EVENT_RULE_TYPE_KERNEL_UPROBE) { |
352b58f5 JR |
2422 | ret = userspace_probe_event_rule_add_callsites( |
2423 | event_rule, creds, event_notifier_rule->fd); | |
2424 | if (ret) { | |
2425 | error_code_ret = LTTNG_ERR_KERN_ENABLE_FAIL; | |
2426 | goto add_callsite_error; | |
2427 | } | |
2428 | } | |
2429 | ||
d602bd6a | 2430 | /* Set the capture bytecode if any. */ |
8dbb86b8 | 2431 | cond_status = lttng_condition_event_rule_matches_get_capture_descriptor_count( |
bbd6675c JR |
2432 | condition, &capture_bytecode_count); |
2433 | assert(cond_status == LTTNG_CONDITION_STATUS_OK); | |
2434 | ||
2435 | for (i = 0; i < capture_bytecode_count; i++) { | |
2436 | const struct lttng_bytecode *capture_bytecode = | |
8dbb86b8 | 2437 | lttng_condition_event_rule_matches_get_capture_bytecode_at_index( |
bbd6675c JR |
2438 | condition, i); |
2439 | ||
2440 | if (capture_bytecode == NULL) { | |
2441 | ERR("Unexpected NULL capture bytecode on condition"); | |
2442 | error_code_ret = LTTNG_ERR_KERN_ENABLE_FAIL; | |
e8b1187d | 2443 | goto capture_error; |
bbd6675c JR |
2444 | } |
2445 | ||
2446 | ret = kernctl_capture(event_notifier_rule->fd, capture_bytecode); | |
2447 | if (ret < 0) { | |
2448 | ERR("Failed to set capture bytecode on event notifier rule fd: fd = %d", | |
2449 | event_notifier_rule->fd); | |
2450 | error_code_ret = LTTNG_ERR_KERN_ENABLE_FAIL; | |
e8b1187d | 2451 | goto capture_error; |
bbd6675c JR |
2452 | } |
2453 | } | |
2454 | ||
352b58f5 JR |
2455 | err = kernctl_enable(event_notifier_rule->fd); |
2456 | if (err < 0) { | |
2457 | switch (-err) { | |
2458 | case EEXIST: | |
2459 | error_code_ret = LTTNG_ERR_KERN_EVENT_EXIST; | |
2460 | break; | |
2461 | default: | |
2462 | PERROR("enable kernel event notifier"); | |
2463 | error_code_ret = LTTNG_ERR_KERN_ENABLE_FAIL; | |
2464 | break; | |
2465 | } | |
2466 | goto enable_error; | |
2467 | } | |
2468 | ||
2469 | /* Add trigger to kernel token mapping in the hash table. */ | |
2470 | rcu_read_lock(); | |
2471 | cds_lfht_add(kernel_token_to_event_notifier_rule_ht, hash_trigger(trigger), | |
2472 | &event_notifier_rule->ht_node); | |
2473 | rcu_read_unlock(); | |
2474 | ||
2475 | DBG("Created kernel event notifier: name = '%s', fd = %d", | |
2476 | kernel_event_notifier.event.name, | |
2477 | event_notifier_rule->fd); | |
2478 | ||
2479 | return LTTNG_OK; | |
2480 | ||
e8b1187d | 2481 | capture_error: |
352b58f5 JR |
2482 | add_callsite_error: |
2483 | enable_error: | |
2484 | set_cloexec_error: | |
2485 | filter_error: | |
2486 | { | |
2487 | const int close_ret = close(event_notifier_rule->fd); | |
2488 | ||
2489 | if (close_ret) { | |
2490 | PERROR("Failed to close kernel event notifier file descriptor: fd = %d", | |
2491 | event_notifier_rule->fd); | |
2492 | } | |
2493 | } | |
2494 | free_event: | |
2495 | free(event_notifier_rule); | |
2496 | error: | |
2497 | return error_code_ret; | |
2498 | } | |
2499 | ||
2500 | enum lttng_error_code kernel_register_event_notifier( | |
2501 | struct lttng_trigger *trigger, | |
2502 | const struct lttng_credentials *cmd_creds) | |
2503 | { | |
2504 | enum lttng_error_code ret; | |
2505 | enum lttng_condition_status status; | |
2506 | enum lttng_domain_type domain_type; | |
2507 | const struct lttng_event_rule *event_rule; | |
2508 | const struct lttng_condition *const condition = | |
2509 | lttng_trigger_get_const_condition(trigger); | |
2510 | const uint64_t token = lttng_trigger_get_tracer_token(trigger); | |
2511 | ||
2512 | assert(condition); | |
2513 | ||
2514 | /* Does not acquire a reference to the event rule. */ | |
8dbb86b8 | 2515 | status = lttng_condition_event_rule_matches_get_rule( |
352b58f5 JR |
2516 | condition, &event_rule); |
2517 | assert(status == LTTNG_CONDITION_STATUS_OK); | |
2518 | ||
2519 | domain_type = lttng_event_rule_get_domain_type(event_rule); | |
2520 | assert(domain_type == LTTNG_DOMAIN_KERNEL); | |
2521 | ||
2522 | ret = kernel_create_event_notifier_rule(trigger, cmd_creds, token); | |
2523 | if (ret != LTTNG_OK) { | |
124dda43 | 2524 | ERR("Failed to create kernel event notifier rule"); |
352b58f5 JR |
2525 | } |
2526 | ||
2527 | return ret; | |
2528 | } | |
2529 | ||
2530 | enum lttng_error_code kernel_unregister_event_notifier( | |
2531 | const struct lttng_trigger *trigger) | |
2532 | { | |
2533 | struct ltt_kernel_event_notifier_rule *token_event_rule_element; | |
2534 | struct cds_lfht_node *node; | |
2535 | struct cds_lfht_iter iter; | |
2536 | enum lttng_error_code error_code_ret; | |
2537 | int ret; | |
2538 | ||
2539 | rcu_read_lock(); | |
2540 | ||
2541 | cds_lfht_lookup(kernel_token_to_event_notifier_rule_ht, | |
2542 | hash_trigger(trigger), match_trigger, trigger, &iter); | |
2543 | ||
2544 | node = cds_lfht_iter_get_node(&iter); | |
2545 | if (!node) { | |
2546 | error_code_ret = LTTNG_ERR_TRIGGER_NOT_FOUND; | |
2547 | goto error; | |
2548 | } | |
2549 | ||
2550 | token_event_rule_element = caa_container_of(node, | |
2551 | struct ltt_kernel_event_notifier_rule, ht_node); | |
2552 | ||
2553 | ret = kernel_disable_event_notifier_rule(token_event_rule_element); | |
2554 | if (ret) { | |
2555 | error_code_ret = LTTNG_ERR_FATAL; | |
2556 | goto error; | |
2557 | } | |
2558 | ||
2559 | trace_kernel_destroy_event_notifier_rule(token_event_rule_element); | |
2560 | error_code_ret = LTTNG_OK; | |
2561 | ||
2562 | error: | |
2563 | rcu_read_unlock(); | |
2564 | ||
2565 | return error_code_ret; | |
2566 | } | |
2567 | ||
2568 | int kernel_get_notification_fd(void) | |
2569 | { | |
2570 | return kernel_tracer_event_notifier_group_notification_fd; | |
2571 | } |