Commit | Line | Data |
---|---|---|
20fe2104 | 1 | /* |
21cf9b6b | 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 | |
c9e313bc SM |
17 | #include <common/common.hpp> |
18 | #include <common/hashtable/utils.hpp> | |
19 | #include <common/trace-chunk.hpp> | |
20 | #include <common/kernel-ctl/kernel-ctl.hpp> | |
21 | #include <common/kernel-ctl/kernel-ioctl.hpp> | |
22 | #include <common/sessiond-comm/sessiond-comm.hpp> | |
23 | #include <common/tracker.hpp> | |
24 | #include <common/utils.hpp> | |
c5bf436c JG |
25 | #include <lttng/event.h> |
26 | #include <lttng/lttng-error.h> | |
27 | #include <lttng/tracker.h> | |
1e307fab | 28 | |
352b58f5 | 29 | #include <lttng/userspace-probe.h> |
c9e313bc | 30 | #include <lttng/userspace-probe-internal.hpp> |
670a26e4 | 31 | #include <lttng/condition/event-rule-matches.h> |
c9e313bc | 32 | #include <lttng/condition/event-rule-matches-internal.hpp> |
352b58f5 | 33 | #include <lttng/event-rule/event-rule.h> |
c9e313bc SM |
34 | #include <lttng/event-rule/event-rule-internal.hpp> |
35 | #include <lttng/event-rule/kernel-uprobe-internal.hpp> | |
352b58f5 | 36 | |
c9e313bc SM |
37 | #include "event-notifier-error-accounting.hpp" |
38 | #include "lttng-sessiond.hpp" | |
39 | #include "lttng-syscall.hpp" | |
40 | #include "condition-internal.hpp" | |
41 | #include "consumer.hpp" | |
42 | #include "kernel.hpp" | |
43 | #include "kernel-consumer.hpp" | |
44 | #include "kern-modules.hpp" | |
45 | #include "sessiond-config.hpp" | |
46 | #include "utils.hpp" | |
47 | #include "rotate.hpp" | |
48 | #include "modprobe.hpp" | |
49 | #include "tracker.hpp" | |
50 | #include "notification-thread-commands.hpp" | |
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 | |
d65106b1 | 65 | /* |
050349bb | 66 | * Add context on a kernel channel. |
df3c77c8 JG |
67 | * |
68 | * Assumes the ownership of ctx. | |
d65106b1 DG |
69 | */ |
70 | int kernel_add_channel_context(struct ltt_kernel_channel *chan, | |
645328ae | 71 | struct ltt_kernel_context *ctx) |
d65106b1 DG |
72 | { |
73 | int ret; | |
74 | ||
a0377dfe FD |
75 | LTTNG_ASSERT(chan); |
76 | LTTNG_ASSERT(ctx); | |
0525e9ae | 77 | |
d65106b1 | 78 | DBG("Adding context to channel %s", chan->channel->name); |
645328ae | 79 | ret = kernctl_add_context(chan->fd, &ctx->ctx); |
d65106b1 | 80 | if (ret < 0) { |
32af2c95 | 81 | switch (-ret) { |
1ae5e83e JD |
82 | case ENOSYS: |
83 | /* Exists but not available for this kernel */ | |
84 | ret = LTTNG_ERR_KERN_CONTEXT_UNAVAILABLE; | |
85 | goto error; | |
86 | case EEXIST: | |
b579acd9 DG |
87 | /* If EEXIST, we just ignore the error */ |
88 | ret = 0; | |
1ae5e83e JD |
89 | goto end; |
90 | default: | |
91 | PERROR("add context ioctl"); | |
92 | ret = LTTNG_ERR_KERN_CONTEXT_FAIL; | |
93 | goto error; | |
b579acd9 | 94 | } |
d65106b1 | 95 | } |
21ed98c1 | 96 | ret = 0; |
d65106b1 | 97 | |
1ae5e83e | 98 | end: |
645328ae | 99 | cds_list_add_tail(&ctx->list, &chan->ctx_list); |
ba985c3a | 100 | ctx->in_list = true; |
df3c77c8 | 101 | ctx = NULL; |
d65106b1 | 102 | error: |
df3c77c8 JG |
103 | if (ctx) { |
104 | trace_kernel_destroy_context(ctx); | |
105 | } | |
d65106b1 DG |
106 | return ret; |
107 | } | |
108 | ||
20fe2104 | 109 | /* |
050349bb DG |
110 | * Create a new kernel session, register it to the kernel tracer and add it to |
111 | * the session daemon session. | |
20fe2104 | 112 | */ |
7d268848 | 113 | int kernel_create_session(struct ltt_session *session) |
20fe2104 DG |
114 | { |
115 | int ret; | |
116 | struct ltt_kernel_session *lks; | |
117 | ||
a0377dfe | 118 | LTTNG_ASSERT(session); |
0525e9ae | 119 | |
54012638 | 120 | /* Allocate data structure */ |
dec56f6c | 121 | lks = trace_kernel_create_session(); |
20fe2104 | 122 | if (lks == NULL) { |
54012638 | 123 | ret = -1; |
20fe2104 DG |
124 | goto error; |
125 | } | |
126 | ||
54012638 | 127 | /* Kernel tracer session creation */ |
7d268848 | 128 | ret = kernctl_create_session(kernel_tracer_fd); |
20fe2104 | 129 | if (ret < 0) { |
df0f840b | 130 | PERROR("ioctl kernel create session"); |
20fe2104 DG |
131 | goto error; |
132 | } | |
133 | ||
20fe2104 | 134 | lks->fd = ret; |
7b395890 DG |
135 | /* Prevent fd duplication after execlp() */ |
136 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
137 | if (ret < 0) { | |
df0f840b | 138 | PERROR("fcntl session fd"); |
7b395890 DG |
139 | } |
140 | ||
53632229 | 141 | lks->id = session->id; |
3bd1e081 | 142 | lks->consumer_fds_sent = 0; |
8c0faa1d | 143 | session->kernel_session = lks; |
8c0faa1d DG |
144 | |
145 | DBG("Kernel session created (fd: %d)", lks->fd); | |
20fe2104 | 146 | |
8ff4109e JR |
147 | /* |
148 | * This is necessary since the creation time is present in the session | |
149 | * name when it is generated. | |
150 | */ | |
151 | if (session->has_auto_generated_name) { | |
152 | ret = kernctl_session_set_name(lks->fd, DEFAULT_SESSION_NAME); | |
153 | } else { | |
154 | ret = kernctl_session_set_name(lks->fd, session->name); | |
155 | } | |
156 | if (ret) { | |
157 | WARN("Could not set kernel session name for session %" PRIu64 " name: %s", | |
158 | session->id, session->name); | |
159 | } | |
160 | ||
e04b2181 JR |
161 | ret = kernctl_session_set_creation_time(lks->fd, session->creation_time); |
162 | if (ret) { | |
163 | WARN("Could not set kernel session creation time for session %" PRIu64 " name: %s", | |
164 | session->id, session->name); | |
165 | } | |
166 | ||
121b0d1a JR |
167 | ret = kernctl_session_set_trace_format(lks->fd, *session->trace_format); |
168 | if (ret) { | |
169 | WARN("Could not set kernel session trace format %" PRIu64 " name: %s", session->id, | |
170 | session->name); | |
171 | } | |
20fe2104 DG |
172 | return 0; |
173 | ||
174 | error: | |
5f62c685 DG |
175 | if (lks) { |
176 | trace_kernel_destroy_session(lks); | |
d070c424 | 177 | trace_kernel_free_session(lks); |
5f62c685 | 178 | } |
20fe2104 DG |
179 | return ret; |
180 | } | |
181 | ||
182 | /* | |
050349bb DG |
183 | * Create a kernel channel, register it to the kernel tracer and add it to the |
184 | * kernel session. | |
20fe2104 | 185 | */ |
050349bb | 186 | int kernel_create_channel(struct ltt_kernel_session *session, |
fdd9eb17 | 187 | struct lttng_channel *chan) |
20fe2104 DG |
188 | { |
189 | int ret; | |
190 | struct ltt_kernel_channel *lkc; | |
20fe2104 | 191 | |
a0377dfe FD |
192 | LTTNG_ASSERT(session); |
193 | LTTNG_ASSERT(chan); | |
0525e9ae | 194 | |
54012638 | 195 | /* Allocate kernel channel */ |
fdd9eb17 | 196 | lkc = trace_kernel_create_channel(chan); |
54012638 | 197 | if (lkc == NULL) { |
20fe2104 DG |
198 | goto error; |
199 | } | |
200 | ||
ecc48a90 | 201 | DBG3("Kernel create channel %s with attr: %d, %" PRIu64 ", %" PRIu64 ", %u, %u, %d, %d", |
fdd9eb17 | 202 | chan->name, lkc->channel->attr.overwrite, |
173af62f DG |
203 | lkc->channel->attr.subbuf_size, lkc->channel->attr.num_subbuf, |
204 | lkc->channel->attr.switch_timer_interval, lkc->channel->attr.read_timer_interval, | |
ecc48a90 | 205 | lkc->channel->attr.live_timer_interval, lkc->channel->attr.output); |
173af62f | 206 | |
54012638 | 207 | /* Kernel tracer channel creation */ |
f3ed775e | 208 | ret = kernctl_create_channel(session->fd, &lkc->channel->attr); |
20fe2104 | 209 | if (ret < 0) { |
df0f840b | 210 | PERROR("ioctl kernel create channel"); |
20fe2104 DG |
211 | goto error; |
212 | } | |
213 | ||
54012638 | 214 | /* Setup the channel fd */ |
20fe2104 | 215 | lkc->fd = ret; |
7b395890 DG |
216 | /* Prevent fd duplication after execlp() */ |
217 | ret = fcntl(lkc->fd, F_SETFD, FD_CLOEXEC); | |
218 | if (ret < 0) { | |
df0f840b | 219 | PERROR("fcntl session fd"); |
7b395890 DG |
220 | } |
221 | ||
54012638 | 222 | /* Add channel to session */ |
8c0faa1d DG |
223 | cds_list_add(&lkc->list, &session->channel_list.head); |
224 | session->channel_count++; | |
fb5f35b6 | 225 | lkc->session = session; |
e1f3997a | 226 | lkc->key = ++next_kernel_channel_key; |
20fe2104 | 227 | |
e1f3997a JD |
228 | DBG("Kernel channel %s created (fd: %d, key: %" PRIu64 ")", |
229 | lkc->channel->name, lkc->fd, lkc->key); | |
20fe2104 DG |
230 | |
231 | return 0; | |
232 | ||
233 | error: | |
5f62c685 DG |
234 | if (lkc) { |
235 | free(lkc->channel); | |
236 | free(lkc); | |
237 | } | |
54012638 | 238 | return -1; |
20fe2104 | 239 | } |
f34daff7 | 240 | |
352b58f5 JR |
241 | /* |
242 | * Create a kernel event notifier group, register it to the kernel tracer and | |
243 | * add it to the kernel session. | |
244 | */ | |
245 | static int kernel_create_event_notifier_group(int *event_notifier_group_fd) | |
246 | { | |
247 | int ret; | |
248 | int local_fd = -1; | |
249 | ||
a0377dfe | 250 | LTTNG_ASSERT(event_notifier_group_fd); |
352b58f5 JR |
251 | |
252 | /* Kernel event notifier group creation. */ | |
253 | ret = kernctl_create_event_notifier_group(kernel_tracer_fd); | |
254 | if (ret < 0) { | |
255 | PERROR("Failed to create kernel event notifier group"); | |
256 | ret = -1; | |
257 | goto error; | |
258 | } | |
259 | ||
260 | local_fd = ret; | |
261 | ||
262 | /* Prevent fd duplication after execlp(). */ | |
263 | ret = fcntl(local_fd, F_SETFD, FD_CLOEXEC); | |
264 | if (ret < 0) { | |
265 | PERROR("Failed to set FD_CLOEXEC on kernel event notifier group file descriptor: fd = %d", | |
266 | local_fd); | |
267 | goto error; | |
268 | } | |
269 | ||
270 | DBG("Created kernel event notifier group: fd = %d", local_fd); | |
271 | *event_notifier_group_fd = local_fd; | |
272 | local_fd = -1; | |
273 | ret = 0; | |
274 | error: | |
275 | if (local_fd >= 0) { | |
276 | ret = close(local_fd); | |
277 | if (ret) { | |
278 | PERROR("Failed to close kernel event notifier group file descriptor: fd = %d", | |
279 | local_fd); | |
280 | } | |
281 | } | |
282 | ||
283 | return ret; | |
284 | } | |
285 | ||
410b78a0 FD |
286 | /* |
287 | * Compute the offset of the instrumentation byte in the binary based on the | |
288 | * function probe location using the ELF lookup method. | |
289 | * | |
290 | * Returns 0 on success and set the offset out parameter to the offset of the | |
291 | * elf symbol | |
292 | * Returns -1 on error | |
293 | */ | |
294 | static | |
295 | int extract_userspace_probe_offset_function_elf( | |
87597c2c | 296 | const struct lttng_userspace_probe_location *probe_location, |
0a398bc4 | 297 | uid_t uid, gid_t gid, uint64_t *offset) |
410b78a0 FD |
298 | { |
299 | int fd; | |
300 | int ret = 0; | |
301 | const char *symbol = NULL; | |
87597c2c | 302 | const struct lttng_userspace_probe_location_lookup_method *lookup = NULL; |
410b78a0 FD |
303 | enum lttng_userspace_probe_location_lookup_method_type lookup_method_type; |
304 | ||
a0377dfe | 305 | LTTNG_ASSERT(lttng_userspace_probe_location_get_type(probe_location) == |
410b78a0 FD |
306 | LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION); |
307 | ||
308 | lookup = lttng_userspace_probe_location_get_lookup_method( | |
309 | probe_location); | |
310 | if (!lookup) { | |
311 | ret = -1; | |
312 | goto end; | |
313 | } | |
314 | ||
315 | lookup_method_type = | |
316 | lttng_userspace_probe_location_lookup_method_get_type(lookup); | |
317 | ||
a0377dfe | 318 | LTTNG_ASSERT(lookup_method_type == |
410b78a0 FD |
319 | LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF); |
320 | ||
321 | symbol = lttng_userspace_probe_location_function_get_function_name( | |
322 | probe_location); | |
323 | if (!symbol) { | |
324 | ret = -1; | |
325 | goto end; | |
326 | } | |
327 | ||
328 | fd = lttng_userspace_probe_location_function_get_binary_fd(probe_location); | |
329 | if (fd < 0) { | |
330 | ret = -1; | |
331 | goto end; | |
332 | } | |
333 | ||
0a398bc4 | 334 | ret = run_as_extract_elf_symbol_offset(fd, symbol, uid, gid, offset); |
410b78a0 FD |
335 | if (ret < 0) { |
336 | DBG("userspace probe offset calculation failed for " | |
337 | "function %s", symbol); | |
338 | goto end; | |
339 | } | |
340 | ||
341 | DBG("userspace probe elf offset for %s is 0x%jd", symbol, (intmax_t)(*offset)); | |
342 | end: | |
343 | return ret; | |
344 | } | |
345 | ||
346 | /* | |
347 | * Compute the offsets of the instrumentation bytes in the binary based on the | |
348 | * tracepoint probe location using the SDT lookup method. This function | |
349 | * allocates the offsets buffer, the caller must free it. | |
350 | * | |
351 | * Returns 0 on success and set the offset out parameter to the offsets of the | |
352 | * SDT tracepoint. | |
353 | * Returns -1 on error. | |
354 | */ | |
355 | static | |
356 | int extract_userspace_probe_offset_tracepoint_sdt( | |
87597c2c | 357 | const struct lttng_userspace_probe_location *probe_location, |
0a398bc4 | 358 | uid_t uid, gid_t gid, uint64_t **offsets, |
410b78a0 FD |
359 | uint32_t *offsets_count) |
360 | { | |
361 | enum lttng_userspace_probe_location_lookup_method_type lookup_method_type; | |
87597c2c | 362 | const struct lttng_userspace_probe_location_lookup_method *lookup = NULL; |
410b78a0 FD |
363 | const char *probe_name = NULL, *provider_name = NULL; |
364 | int ret = 0; | |
365 | int fd, i; | |
366 | ||
a0377dfe | 367 | LTTNG_ASSERT(lttng_userspace_probe_location_get_type(probe_location) == |
410b78a0 FD |
368 | LTTNG_USERSPACE_PROBE_LOCATION_TYPE_TRACEPOINT); |
369 | ||
370 | lookup = lttng_userspace_probe_location_get_lookup_method(probe_location); | |
371 | if (!lookup) { | |
372 | ret = -1; | |
373 | goto end; | |
374 | } | |
375 | ||
376 | lookup_method_type = | |
377 | lttng_userspace_probe_location_lookup_method_get_type(lookup); | |
378 | ||
a0377dfe | 379 | LTTNG_ASSERT(lookup_method_type == |
410b78a0 FD |
380 | LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_TRACEPOINT_SDT); |
381 | ||
382 | ||
383 | probe_name = lttng_userspace_probe_location_tracepoint_get_probe_name( | |
384 | probe_location); | |
385 | if (!probe_name) { | |
386 | ret = -1; | |
387 | goto end; | |
388 | } | |
389 | ||
390 | provider_name = lttng_userspace_probe_location_tracepoint_get_provider_name( | |
391 | probe_location); | |
392 | if (!provider_name) { | |
393 | ret = -1; | |
394 | goto end; | |
395 | } | |
396 | ||
397 | fd = lttng_userspace_probe_location_tracepoint_get_binary_fd(probe_location); | |
398 | if (fd < 0) { | |
399 | ret = -1; | |
400 | goto end; | |
401 | } | |
402 | ||
403 | ret = run_as_extract_sdt_probe_offsets(fd, provider_name, probe_name, | |
0a398bc4 | 404 | uid, gid, offsets, offsets_count); |
410b78a0 FD |
405 | if (ret < 0) { |
406 | DBG("userspace probe offset calculation failed for sdt " | |
407 | "probe %s:%s", provider_name, probe_name); | |
408 | goto end; | |
409 | } | |
410 | ||
411 | if (*offsets_count == 0) { | |
412 | DBG("no userspace probe offset found"); | |
413 | goto end; | |
414 | } | |
415 | ||
416 | DBG("%u userspace probe SDT offsets found for %s:%s at:", | |
417 | *offsets_count, provider_name, probe_name); | |
418 | for (i = 0; i < *offsets_count; i++) { | |
419 | DBG("\t0x%jd", (intmax_t)((*offsets)[i])); | |
420 | } | |
421 | end: | |
422 | return ret; | |
423 | } | |
424 | ||
410b78a0 | 425 | static |
0a398bc4 FD |
426 | int userspace_probe_add_callsite( |
427 | const struct lttng_userspace_probe_location *location, | |
428 | uid_t uid, gid_t gid, int fd) | |
410b78a0 | 429 | { |
87597c2c | 430 | const struct lttng_userspace_probe_location_lookup_method *lookup_method = NULL; |
410b78a0 | 431 | enum lttng_userspace_probe_location_lookup_method_type type; |
410b78a0 FD |
432 | int ret; |
433 | ||
0a398bc4 | 434 | lookup_method = lttng_userspace_probe_location_get_lookup_method(location); |
410b78a0 FD |
435 | if (!lookup_method) { |
436 | ret = -1; | |
437 | goto end; | |
438 | } | |
439 | ||
440 | type = lttng_userspace_probe_location_lookup_method_get_type(lookup_method); | |
441 | switch (type) { | |
442 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF: | |
443 | { | |
b8e2fb80 | 444 | struct lttng_kernel_abi_event_callsite callsite; |
410b78a0 FD |
445 | uint64_t offset; |
446 | ||
0a398bc4 FD |
447 | ret = extract_userspace_probe_offset_function_elf(location, |
448 | uid, gid, &offset); | |
410b78a0 FD |
449 | if (ret) { |
450 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
451 | goto end; | |
452 | } | |
453 | ||
454 | callsite.u.uprobe.offset = offset; | |
455 | ret = kernctl_add_callsite(fd, &callsite); | |
456 | if (ret) { | |
0a398bc4 | 457 | WARN("Failed to add callsite to ELF userspace probe."); |
410b78a0 FD |
458 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
459 | goto end; | |
460 | } | |
461 | break; | |
462 | } | |
463 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_TRACEPOINT_SDT: | |
464 | { | |
465 | int i; | |
466 | uint64_t *offsets = NULL; | |
467 | uint32_t offsets_count; | |
b8e2fb80 | 468 | struct lttng_kernel_abi_event_callsite callsite; |
410b78a0 FD |
469 | |
470 | /* | |
471 | * This call allocates the offsets buffer. This buffer must be freed | |
472 | * by the caller | |
473 | */ | |
0a398bc4 FD |
474 | ret = extract_userspace_probe_offset_tracepoint_sdt(location, |
475 | uid, gid, &offsets, &offsets_count); | |
410b78a0 FD |
476 | if (ret) { |
477 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
478 | goto end; | |
479 | } | |
480 | for (i = 0; i < offsets_count; i++) { | |
481 | callsite.u.uprobe.offset = offsets[i]; | |
482 | ret = kernctl_add_callsite(fd, &callsite); | |
483 | if (ret) { | |
0a398bc4 | 484 | WARN("Failed to add callsite to SDT userspace probe"); |
410b78a0 FD |
485 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
486 | free(offsets); | |
487 | goto end; | |
488 | } | |
489 | } | |
490 | free(offsets); | |
491 | break; | |
492 | } | |
493 | default: | |
494 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
495 | goto end; | |
496 | } | |
497 | end: | |
498 | return ret; | |
499 | } | |
500 | ||
0a398bc4 FD |
501 | /* |
502 | * Extract the offsets of the instrumentation point for the different lookup | |
503 | * methods. | |
504 | */ | |
505 | static | |
506 | int userspace_probe_event_add_callsites(struct lttng_event *ev, | |
507 | struct ltt_kernel_session *session, int fd) | |
508 | { | |
509 | int ret; | |
510 | const struct lttng_userspace_probe_location *location = NULL; | |
511 | ||
a0377dfe FD |
512 | LTTNG_ASSERT(ev); |
513 | LTTNG_ASSERT(ev->type == LTTNG_EVENT_USERSPACE_PROBE); | |
0a398bc4 FD |
514 | |
515 | location = lttng_event_get_userspace_probe_location(ev); | |
516 | if (!location) { | |
517 | ret = -1; | |
518 | goto end; | |
519 | } | |
520 | ||
521 | ret = userspace_probe_add_callsite(location, session->uid, session->gid, | |
522 | fd); | |
523 | if (ret) { | |
524 | WARN("Failed to add callsite to userspace probe event '%s'", | |
525 | ev->name); | |
526 | } | |
527 | ||
528 | end: | |
529 | return ret; | |
530 | } | |
531 | ||
352b58f5 JR |
532 | /* |
533 | * Extract the offsets of the instrumentation point for the different look-up | |
534 | * methods. | |
535 | */ | |
536 | static int userspace_probe_event_rule_add_callsites( | |
537 | const struct lttng_event_rule *rule, | |
538 | const struct lttng_credentials *creds, | |
539 | int fd) | |
540 | { | |
541 | int ret; | |
542 | enum lttng_event_rule_status status; | |
543 | enum lttng_event_rule_type event_rule_type; | |
544 | const struct lttng_userspace_probe_location *location = NULL; | |
545 | ||
a0377dfe FD |
546 | LTTNG_ASSERT(rule); |
547 | LTTNG_ASSERT(creds); | |
352b58f5 JR |
548 | |
549 | event_rule_type = lttng_event_rule_get_type(rule); | |
a0377dfe | 550 | LTTNG_ASSERT(event_rule_type == LTTNG_EVENT_RULE_TYPE_KERNEL_UPROBE); |
352b58f5 | 551 | |
46fd07ac | 552 | status = lttng_event_rule_kernel_uprobe_get_location(rule, &location); |
352b58f5 JR |
553 | if (status != LTTNG_EVENT_RULE_STATUS_OK || !location) { |
554 | ret = -1; | |
555 | goto end; | |
556 | } | |
557 | ||
558 | ret = userspace_probe_add_callsite(location, | |
559 | lttng_credentials_get_uid(creds), | |
560 | lttng_credentials_get_gid(creds), fd); | |
561 | if (ret) { | |
562 | WARN("Failed to add callsite to user space probe object: fd = %d", | |
563 | fd); | |
564 | } | |
565 | ||
566 | end: | |
567 | return ret; | |
568 | } | |
569 | ||
f34daff7 | 570 | /* |
050349bb DG |
571 | * Create a kernel event, enable it to the kernel tracer and add it to the |
572 | * channel event list of the kernel session. | |
49d21f93 | 573 | * We own filter_expression and filter. |
f34daff7 | 574 | */ |
050349bb | 575 | int kernel_create_event(struct lttng_event *ev, |
00a62084 MD |
576 | struct ltt_kernel_channel *channel, |
577 | char *filter_expression, | |
2b00d462 | 578 | struct lttng_bytecode *filter) |
f34daff7 | 579 | { |
71a3bb01 FD |
580 | int err, fd; |
581 | enum lttng_error_code ret; | |
f34daff7 | 582 | struct ltt_kernel_event *event; |
f34daff7 | 583 | |
a0377dfe FD |
584 | LTTNG_ASSERT(ev); |
585 | LTTNG_ASSERT(channel); | |
0525e9ae | 586 | |
a969e101 | 587 | /* We pass ownership of filter_expression and filter */ |
71a3bb01 FD |
588 | ret = trace_kernel_create_event(ev, filter_expression, |
589 | filter, &event); | |
590 | if (ret != LTTNG_OK) { | |
f34daff7 DG |
591 | goto error; |
592 | } | |
593 | ||
71a3bb01 FD |
594 | fd = kernctl_create_event(channel->fd, event->event); |
595 | if (fd < 0) { | |
596 | switch (-fd) { | |
bd29c13d | 597 | case EEXIST: |
71a3bb01 | 598 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
bd29c13d DG |
599 | break; |
600 | case ENOSYS: | |
601 | WARN("Event type not implemented"); | |
71a3bb01 | 602 | ret = LTTNG_ERR_KERN_EVENT_ENOSYS; |
bd29c13d | 603 | break; |
8197a339 DG |
604 | case ENOENT: |
605 | WARN("Event %s not found!", ev->name); | |
71a3bb01 | 606 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
8197a339 | 607 | break; |
bd29c13d | 608 | default: |
71a3bb01 | 609 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
d87bfb32 DG |
610 | PERROR("create event ioctl"); |
611 | } | |
e953ef25 | 612 | goto free_event; |
8c0faa1d | 613 | } |
f34daff7 | 614 | |
d0ae4ea8 | 615 | event->type = ev->type; |
71a3bb01 | 616 | event->fd = fd; |
7b395890 | 617 | /* Prevent fd duplication after execlp() */ |
71a3bb01 FD |
618 | err = fcntl(event->fd, F_SETFD, FD_CLOEXEC); |
619 | if (err < 0) { | |
df0f840b | 620 | PERROR("fcntl session fd"); |
7b395890 DG |
621 | } |
622 | ||
00a62084 | 623 | if (filter) { |
71a3bb01 FD |
624 | err = kernctl_filter(event->fd, filter); |
625 | if (err < 0) { | |
626 | switch (-err) { | |
627 | case ENOMEM: | |
628 | ret = LTTNG_ERR_FILTER_NOMEM; | |
629 | break; | |
630 | default: | |
631 | ret = LTTNG_ERR_FILTER_INVAL; | |
632 | break; | |
633 | } | |
00a62084 MD |
634 | goto filter_error; |
635 | } | |
636 | } | |
637 | ||
dcabc190 | 638 | if (ev->type == LTTNG_EVENT_USERSPACE_PROBE) { |
7966af57 | 639 | ret = (lttng_error_code) userspace_probe_event_add_callsites(ev, channel->session, |
0a398bc4 | 640 | event->fd); |
dcabc190 FD |
641 | if (ret) { |
642 | goto add_callsite_error; | |
643 | } | |
644 | } | |
645 | ||
71a3bb01 FD |
646 | err = kernctl_enable(event->fd); |
647 | if (err < 0) { | |
648 | switch (-err) { | |
00a62084 MD |
649 | case EEXIST: |
650 | ret = LTTNG_ERR_KERN_EVENT_EXIST; | |
651 | break; | |
652 | default: | |
653 | PERROR("enable kernel event"); | |
71a3bb01 | 654 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
00a62084 MD |
655 | break; |
656 | } | |
657 | goto enable_error; | |
658 | } | |
659 | ||
f3ed775e DG |
660 | /* Add event to event list */ |
661 | cds_list_add(&event->list, &channel->events_list.head); | |
cbbbb275 DG |
662 | channel->event_count++; |
663 | ||
e953ef25 DG |
664 | DBG("Event %s created (fd: %d)", ev->name, event->fd); |
665 | ||
666 | return 0; | |
667 | ||
dcabc190 | 668 | add_callsite_error: |
00a62084 MD |
669 | enable_error: |
670 | filter_error: | |
671 | { | |
672 | int closeret; | |
673 | ||
674 | closeret = close(event->fd); | |
675 | if (closeret) { | |
676 | PERROR("close event fd"); | |
677 | } | |
678 | } | |
e953ef25 DG |
679 | free_event: |
680 | free(event); | |
681 | error: | |
d87bfb32 | 682 | return ret; |
e953ef25 DG |
683 | } |
684 | ||
26cc6b4e | 685 | /* |
050349bb | 686 | * Disable a kernel channel. |
26cc6b4e DG |
687 | */ |
688 | int kernel_disable_channel(struct ltt_kernel_channel *chan) | |
689 | { | |
690 | int ret; | |
691 | ||
a0377dfe | 692 | LTTNG_ASSERT(chan); |
0525e9ae | 693 | |
26cc6b4e DG |
694 | ret = kernctl_disable(chan->fd); |
695 | if (ret < 0) { | |
df0f840b | 696 | PERROR("disable chan ioctl"); |
26cc6b4e DG |
697 | goto error; |
698 | } | |
699 | ||
700 | chan->enabled = 0; | |
e1f3997a JD |
701 | DBG("Kernel channel %s disabled (fd: %d, key: %" PRIu64 ")", |
702 | chan->channel->name, chan->fd, chan->key); | |
26cc6b4e DG |
703 | |
704 | return 0; | |
705 | ||
706 | error: | |
707 | return ret; | |
708 | } | |
709 | ||
d36b8583 | 710 | /* |
050349bb | 711 | * Enable a kernel channel. |
d36b8583 DG |
712 | */ |
713 | int kernel_enable_channel(struct ltt_kernel_channel *chan) | |
714 | { | |
715 | int ret; | |
716 | ||
a0377dfe | 717 | LTTNG_ASSERT(chan); |
0525e9ae | 718 | |
d36b8583 | 719 | ret = kernctl_enable(chan->fd); |
32af2c95 | 720 | if (ret < 0 && ret != -EEXIST) { |
df0f840b | 721 | PERROR("Enable kernel chan"); |
d36b8583 DG |
722 | goto error; |
723 | } | |
724 | ||
725 | chan->enabled = 1; | |
e1f3997a JD |
726 | DBG("Kernel channel %s enabled (fd: %d, key: %" PRIu64 ")", |
727 | chan->channel->name, chan->fd, chan->key); | |
d36b8583 DG |
728 | |
729 | return 0; | |
730 | ||
731 | error: | |
732 | return ret; | |
733 | } | |
734 | ||
19e70852 | 735 | /* |
050349bb | 736 | * Enable a kernel event. |
19e70852 DG |
737 | */ |
738 | int kernel_enable_event(struct ltt_kernel_event *event) | |
739 | { | |
740 | int ret; | |
741 | ||
a0377dfe | 742 | LTTNG_ASSERT(event); |
0525e9ae | 743 | |
19e70852 | 744 | ret = kernctl_enable(event->fd); |
42224349 | 745 | if (ret < 0) { |
32af2c95 | 746 | switch (-ret) { |
42224349 | 747 | case EEXIST: |
f73fabfd | 748 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
42224349 DG |
749 | break; |
750 | default: | |
751 | PERROR("enable kernel event"); | |
752 | break; | |
753 | } | |
19e70852 DG |
754 | goto error; |
755 | } | |
756 | ||
757 | event->enabled = 1; | |
758 | DBG("Kernel event %s enabled (fd: %d)", event->event->name, event->fd); | |
759 | ||
760 | return 0; | |
761 | ||
762 | error: | |
d36b8583 | 763 | return ret; |
19e70852 DG |
764 | } |
765 | ||
e953ef25 | 766 | /* |
050349bb | 767 | * Disable a kernel event. |
e953ef25 | 768 | */ |
19e70852 | 769 | int kernel_disable_event(struct ltt_kernel_event *event) |
e953ef25 DG |
770 | { |
771 | int ret; | |
19e70852 | 772 | |
a0377dfe | 773 | LTTNG_ASSERT(event); |
0525e9ae | 774 | |
19e70852 | 775 | ret = kernctl_disable(event->fd); |
42224349 | 776 | if (ret < 0) { |
d79bd829 JG |
777 | PERROR("Failed to disable kernel event: name = '%s', fd = %d", |
778 | event->event->name, event->fd); | |
19e70852 | 779 | goto error; |
e953ef25 | 780 | } |
f3ed775e | 781 | |
19e70852 DG |
782 | event->enabled = 0; |
783 | DBG("Kernel event %s disabled (fd: %d)", event->event->name, event->fd); | |
784 | ||
f34daff7 DG |
785 | return 0; |
786 | ||
787 | error: | |
d36b8583 | 788 | return ret; |
f34daff7 | 789 | } |
aaf26714 | 790 | |
352b58f5 JR |
791 | /* |
792 | * Disable a kernel event notifier. | |
793 | */ | |
794 | static | |
795 | int kernel_disable_event_notifier_rule(struct ltt_kernel_event_notifier_rule *event) | |
796 | { | |
797 | int ret; | |
798 | ||
a0377dfe | 799 | LTTNG_ASSERT(event); |
352b58f5 JR |
800 | |
801 | rcu_read_lock(); | |
802 | cds_lfht_del(kernel_token_to_event_notifier_rule_ht, &event->ht_node); | |
803 | rcu_read_unlock(); | |
804 | ||
805 | ret = kernctl_disable(event->fd); | |
806 | if (ret < 0) { | |
d79bd829 JG |
807 | PERROR("Failed to disable kernel event notifier: fd = %d, token = %" PRIu64, |
808 | event->fd, event->token); | |
352b58f5 JR |
809 | goto error; |
810 | } | |
811 | ||
812 | event->enabled = 0; | |
813 | DBG("Disabled kernel event notifier: fd = %d, token = %" PRIu64, | |
814 | event->fd, event->token); | |
815 | ||
816 | error: | |
817 | return ret; | |
818 | } | |
819 | ||
159b042f JG |
820 | static |
821 | struct process_attr_tracker *_kernel_get_process_attr_tracker( | |
55c9e7ca | 822 | struct ltt_kernel_session *session, |
159b042f | 823 | enum lttng_process_attr process_attr) |
55c9e7ca | 824 | { |
159b042f JG |
825 | switch (process_attr) { |
826 | case LTTNG_PROCESS_ATTR_PROCESS_ID: | |
827 | return session->tracker_pid; | |
828 | case LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID: | |
829 | return session->tracker_vpid; | |
830 | case LTTNG_PROCESS_ATTR_USER_ID: | |
831 | return session->tracker_uid; | |
832 | case LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID: | |
833 | return session->tracker_vuid; | |
834 | case LTTNG_PROCESS_ATTR_GROUP_ID: | |
835 | return session->tracker_gid; | |
836 | case LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID: | |
837 | return session->tracker_vgid; | |
55c9e7ca JR |
838 | default: |
839 | return NULL; | |
840 | } | |
841 | } | |
6e911cad | 842 | |
159b042f | 843 | const struct process_attr_tracker *kernel_get_process_attr_tracker( |
55c9e7ca | 844 | struct ltt_kernel_session *session, |
159b042f | 845 | enum lttng_process_attr process_attr) |
ccf10263 | 846 | { |
159b042f JG |
847 | return (const struct process_attr_tracker *) |
848 | _kernel_get_process_attr_tracker(session, process_attr); | |
849 | } | |
7c493d31 | 850 | |
159b042f JG |
851 | enum lttng_error_code kernel_process_attr_tracker_set_tracking_policy( |
852 | struct ltt_kernel_session *session, | |
853 | enum lttng_process_attr process_attr, | |
854 | enum lttng_tracking_policy policy) | |
855 | { | |
856 | int ret; | |
857 | enum lttng_error_code ret_code = LTTNG_OK; | |
858 | struct process_attr_tracker *tracker = | |
859 | _kernel_get_process_attr_tracker(session, process_attr); | |
860 | enum lttng_tracking_policy previous_policy; | |
55c9e7ca | 861 | |
159b042f JG |
862 | if (!tracker) { |
863 | ret_code = LTTNG_ERR_INVALID; | |
864 | goto end; | |
7c493d31 | 865 | } |
ccf10263 | 866 | |
159b042f JG |
867 | previous_policy = process_attr_tracker_get_tracking_policy(tracker); |
868 | ret = process_attr_tracker_set_tracking_policy(tracker, policy); | |
869 | if (ret) { | |
870 | ret_code = LTTNG_ERR_UNK; | |
871 | goto end; | |
55c9e7ca | 872 | } |
7c493d31 | 873 | |
159b042f | 874 | if (previous_policy == policy) { |
55c9e7ca | 875 | goto end; |
7c493d31 | 876 | } |
55c9e7ca | 877 | |
159b042f JG |
878 | switch (policy) { |
879 | case LTTNG_TRACKING_POLICY_INCLUDE_ALL: | |
880 | if (process_attr == LTTNG_PROCESS_ATTR_PROCESS_ID) { | |
881 | /* | |
882 | * Maintain a special case for the process ID process | |
883 | * attribute tracker as it was the only supported | |
884 | * attribute prior to 2.12. | |
885 | */ | |
886 | ret = kernctl_track_pid(session->fd, -1); | |
887 | } else { | |
888 | ret = kernctl_track_id(session->fd, process_attr, -1); | |
55c9e7ca JR |
889 | } |
890 | break; | |
159b042f JG |
891 | case LTTNG_TRACKING_POLICY_EXCLUDE_ALL: |
892 | case LTTNG_TRACKING_POLICY_INCLUDE_SET: | |
893 | /* fall-through. */ | |
894 | if (process_attr == LTTNG_PROCESS_ATTR_PROCESS_ID) { | |
895 | /* | |
896 | * Maintain a special case for the process ID process | |
897 | * attribute tracker as it was the only supported | |
898 | * attribute prior to 2.12. | |
899 | */ | |
900 | ret = kernctl_untrack_pid(session->fd, -1); | |
901 | } else { | |
902 | ret = kernctl_untrack_id(session->fd, process_attr, -1); | |
55c9e7ca JR |
903 | } |
904 | break; | |
905 | default: | |
159b042f | 906 | abort(); |
55c9e7ca | 907 | } |
159b042f | 908 | /* kern-ctl error handling */ |
32af2c95 | 909 | switch (-ret) { |
159b042f JG |
910 | case 0: |
911 | ret_code = LTTNG_OK; | |
912 | break; | |
7c493d31 | 913 | case EINVAL: |
159b042f | 914 | ret_code = LTTNG_ERR_INVALID; |
55c9e7ca | 915 | break; |
7c493d31 | 916 | case ENOMEM: |
159b042f | 917 | ret_code = LTTNG_ERR_NOMEM; |
55c9e7ca JR |
918 | break; |
919 | case EEXIST: | |
159b042f | 920 | ret_code = LTTNG_ERR_PROCESS_ATTR_EXISTS; |
55c9e7ca | 921 | break; |
7c493d31 | 922 | default: |
159b042f | 923 | ret_code = LTTNG_ERR_UNK; |
55c9e7ca JR |
924 | break; |
925 | } | |
55c9e7ca | 926 | end: |
159b042f | 927 | return ret_code; |
ccf10263 MD |
928 | } |
929 | ||
159b042f | 930 | enum lttng_error_code kernel_process_attr_tracker_inclusion_set_add_value( |
55c9e7ca | 931 | struct ltt_kernel_session *session, |
159b042f JG |
932 | enum lttng_process_attr process_attr, |
933 | const struct process_attr_value *value) | |
a5dfbb9d | 934 | { |
159b042f JG |
935 | int ret, integral_value; |
936 | enum lttng_error_code ret_code; | |
937 | struct process_attr_tracker *tracker; | |
938 | enum process_attr_tracker_status status; | |
a5dfbb9d | 939 | |
159b042f JG |
940 | /* |
941 | * Convert process attribute tracker value to the integral | |
942 | * representation required by the kern-ctl API. | |
943 | */ | |
944 | switch (process_attr) { | |
945 | case LTTNG_PROCESS_ATTR_PROCESS_ID: | |
946 | case LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID: | |
947 | integral_value = (int) value->value.pid; | |
55c9e7ca | 948 | break; |
159b042f JG |
949 | case LTTNG_PROCESS_ATTR_USER_ID: |
950 | case LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID: | |
951 | if (value->type == LTTNG_PROCESS_ATTR_VALUE_TYPE_USER_NAME) { | |
952 | uid_t uid; | |
953 | ||
954 | ret_code = utils_user_id_from_name( | |
955 | value->value.user_name, &uid); | |
956 | if (ret_code != LTTNG_OK) { | |
957 | goto end; | |
958 | } | |
959 | integral_value = (int) uid; | |
960 | } else { | |
961 | integral_value = (int) value->value.uid; | |
55c9e7ca JR |
962 | } |
963 | break; | |
159b042f JG |
964 | case LTTNG_PROCESS_ATTR_GROUP_ID: |
965 | case LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID: | |
966 | if (value->type == LTTNG_PROCESS_ATTR_VALUE_TYPE_GROUP_NAME) { | |
967 | gid_t gid; | |
968 | ||
969 | ret_code = utils_group_id_from_name( | |
970 | value->value.group_name, &gid); | |
971 | if (ret_code != LTTNG_OK) { | |
972 | goto end; | |
973 | } | |
974 | integral_value = (int) gid; | |
975 | } else { | |
976 | integral_value = (int) value->value.gid; | |
a5dfbb9d | 977 | } |
55c9e7ca JR |
978 | break; |
979 | default: | |
159b042f JG |
980 | ret_code = LTTNG_ERR_INVALID; |
981 | goto end; | |
55c9e7ca JR |
982 | } |
983 | ||
159b042f JG |
984 | tracker = _kernel_get_process_attr_tracker(session, process_attr); |
985 | if (!tracker) { | |
986 | ret_code = LTTNG_ERR_INVALID; | |
987 | goto end; | |
988 | } | |
989 | ||
990 | status = process_attr_tracker_inclusion_set_add_value(tracker, value); | |
991 | if (status != PROCESS_ATTR_TRACKER_STATUS_OK) { | |
992 | switch (status) { | |
993 | case PROCESS_ATTR_TRACKER_STATUS_EXISTS: | |
994 | ret_code = LTTNG_ERR_PROCESS_ATTR_EXISTS; | |
995 | break; | |
996 | case PROCESS_ATTR_TRACKER_STATUS_INVALID_TRACKING_POLICY: | |
997 | ret_code = LTTNG_ERR_PROCESS_ATTR_TRACKER_INVALID_TRACKING_POLICY; | |
998 | break; | |
999 | case PROCESS_ATTR_TRACKER_STATUS_ERROR: | |
1000 | default: | |
1001 | ret_code = LTTNG_ERR_UNK; | |
1002 | break; | |
1003 | } | |
1004 | goto end; | |
1005 | } | |
1006 | ||
1007 | DBG("Kernel track %s %d for session id %" PRIu64, | |
1008 | lttng_process_attr_to_string(process_attr), | |
1009 | integral_value, session->id); | |
1010 | if (process_attr == LTTNG_PROCESS_ATTR_PROCESS_ID) { | |
1011 | /* | |
1012 | * Maintain a special case for the process ID process attribute | |
1013 | * tracker as it was the only supported attribute prior to 2.12. | |
1014 | */ | |
1015 | ret = kernctl_track_pid(session->fd, integral_value); | |
1016 | } else { | |
1017 | ret = kernctl_track_id( | |
1018 | session->fd, process_attr, integral_value); | |
1019 | } | |
1020 | if (ret == 0) { | |
1021 | ret_code = LTTNG_OK; | |
1022 | goto end; | |
1023 | } | |
1024 | ||
1025 | kernel_wait_quiescent(); | |
1026 | ||
1027 | /* kern-ctl error handling */ | |
55c9e7ca | 1028 | switch (-ret) { |
159b042f JG |
1029 | case 0: |
1030 | ret_code = LTTNG_OK; | |
1031 | break; | |
55c9e7ca | 1032 | case EINVAL: |
159b042f | 1033 | ret_code = LTTNG_ERR_INVALID; |
55c9e7ca JR |
1034 | break; |
1035 | case ENOMEM: | |
159b042f | 1036 | ret_code = LTTNG_ERR_NOMEM; |
55c9e7ca JR |
1037 | break; |
1038 | case EEXIST: | |
159b042f | 1039 | ret_code = LTTNG_ERR_PROCESS_ATTR_EXISTS; |
55c9e7ca JR |
1040 | break; |
1041 | default: | |
159b042f | 1042 | ret_code = LTTNG_ERR_UNK; |
55c9e7ca | 1043 | break; |
a5dfbb9d MD |
1044 | } |
1045 | ||
159b042f JG |
1046 | /* Attempt to remove the value from the tracker. */ |
1047 | status = process_attr_tracker_inclusion_set_remove_value( | |
1048 | tracker, value); | |
1049 | if (status != PROCESS_ATTR_TRACKER_STATUS_OK) { | |
1050 | ERR("Failed to roll-back the tracking of kernel %s process attribute %d while handling a kern-ctl error", | |
1051 | lttng_process_attr_to_string(process_attr), | |
1052 | integral_value); | |
55c9e7ca | 1053 | } |
a5dfbb9d | 1054 | end: |
159b042f | 1055 | return ret_code; |
55c9e7ca | 1056 | } |
a5dfbb9d | 1057 | |
159b042f | 1058 | enum lttng_error_code kernel_process_attr_tracker_inclusion_set_remove_value( |
55c9e7ca | 1059 | struct ltt_kernel_session *session, |
159b042f JG |
1060 | enum lttng_process_attr process_attr, |
1061 | const struct process_attr_value *value) | |
55c9e7ca | 1062 | { |
159b042f JG |
1063 | int ret, integral_value; |
1064 | enum lttng_error_code ret_code; | |
1065 | struct process_attr_tracker *tracker; | |
1066 | enum process_attr_tracker_status status; | |
1067 | ||
1068 | /* | |
1069 | * Convert process attribute tracker value to the integral | |
1070 | * representation required by the kern-ctl API. | |
1071 | */ | |
1072 | switch (process_attr) { | |
1073 | case LTTNG_PROCESS_ATTR_PROCESS_ID: | |
1074 | case LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID: | |
1075 | integral_value = (int) value->value.pid; | |
1076 | break; | |
1077 | case LTTNG_PROCESS_ATTR_USER_ID: | |
1078 | case LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID: | |
1079 | if (value->type == LTTNG_PROCESS_ATTR_VALUE_TYPE_USER_NAME) { | |
1080 | uid_t uid; | |
1081 | ||
1082 | ret_code = utils_user_id_from_name( | |
1083 | value->value.user_name, &uid); | |
1084 | if (ret_code != LTTNG_OK) { | |
1085 | goto end; | |
1086 | } | |
1087 | integral_value = (int) uid; | |
1088 | } else { | |
1089 | integral_value = (int) value->value.uid; | |
1090 | } | |
1091 | break; | |
1092 | case LTTNG_PROCESS_ATTR_GROUP_ID: | |
1093 | case LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID: | |
1094 | if (value->type == LTTNG_PROCESS_ATTR_VALUE_TYPE_GROUP_NAME) { | |
1095 | gid_t gid; | |
1096 | ||
1097 | ret_code = utils_group_id_from_name( | |
1098 | value->value.group_name, &gid); | |
1099 | if (ret_code != LTTNG_OK) { | |
1100 | goto end; | |
1101 | } | |
1102 | integral_value = (int) gid; | |
1103 | } else { | |
1104 | integral_value = (int) value->value.gid; | |
1105 | } | |
1106 | break; | |
1107 | default: | |
1108 | ret_code = LTTNG_ERR_INVALID; | |
1109 | goto end; | |
1110 | } | |
55c9e7ca | 1111 | |
159b042f JG |
1112 | tracker = _kernel_get_process_attr_tracker(session, process_attr); |
1113 | if (!tracker) { | |
1114 | ret_code = LTTNG_ERR_INVALID; | |
a7a533cd | 1115 | goto end; |
a5dfbb9d | 1116 | } |
a7a533cd | 1117 | |
159b042f JG |
1118 | status = process_attr_tracker_inclusion_set_remove_value( |
1119 | tracker, value); | |
1120 | if (status != PROCESS_ATTR_TRACKER_STATUS_OK) { | |
1121 | switch (status) { | |
1122 | case PROCESS_ATTR_TRACKER_STATUS_MISSING: | |
1123 | ret_code = LTTNG_ERR_PROCESS_ATTR_MISSING; | |
1124 | break; | |
1125 | case PROCESS_ATTR_TRACKER_STATUS_INVALID_TRACKING_POLICY: | |
1126 | ret_code = LTTNG_ERR_PROCESS_ATTR_TRACKER_INVALID_TRACKING_POLICY; | |
1127 | break; | |
1128 | case PROCESS_ATTR_TRACKER_STATUS_ERROR: | |
1129 | default: | |
1130 | ret_code = LTTNG_ERR_UNK; | |
1131 | break; | |
1132 | } | |
a7a533cd JR |
1133 | goto end; |
1134 | } | |
1135 | ||
159b042f JG |
1136 | DBG("Kernel track %s %d for session id %" PRIu64, |
1137 | lttng_process_attr_to_string(process_attr), | |
1138 | integral_value, session->id); | |
1139 | if (process_attr == LTTNG_PROCESS_ATTR_PROCESS_ID) { | |
1140 | /* | |
1141 | * Maintain a special case for the process ID process attribute | |
1142 | * tracker as it was the only supported attribute prior to 2.12. | |
1143 | */ | |
1144 | ret = kernctl_untrack_pid(session->fd, integral_value); | |
1145 | } else { | |
1146 | ret = kernctl_untrack_id( | |
1147 | session->fd, process_attr, integral_value); | |
1148 | } | |
1149 | if (ret == 0) { | |
1150 | ret_code = LTTNG_OK; | |
1151 | goto end; | |
1152 | } | |
1153 | kernel_wait_quiescent(); | |
1154 | ||
1155 | /* kern-ctl error handling */ | |
1156 | switch (-ret) { | |
1157 | case 0: | |
1158 | ret_code = LTTNG_OK; | |
1159 | break; | |
1160 | case EINVAL: | |
1161 | ret_code = LTTNG_ERR_INVALID; | |
1162 | break; | |
1163 | case ENOMEM: | |
1164 | ret_code = LTTNG_ERR_NOMEM; | |
1165 | break; | |
1166 | case ENOENT: | |
1167 | ret_code = LTTNG_ERR_PROCESS_ATTR_MISSING; | |
1168 | break; | |
1169 | default: | |
1170 | ret_code = LTTNG_ERR_UNK; | |
1171 | break; | |
1172 | } | |
1173 | ||
1174 | /* Attempt to add the value to the tracker. */ | |
1175 | status = process_attr_tracker_inclusion_set_add_value( | |
1176 | tracker, value); | |
1177 | if (status != PROCESS_ATTR_TRACKER_STATUS_OK) { | |
1178 | ERR("Failed to roll-back the tracking of kernel %s process attribute %d while handling a kern-ctl error", | |
1179 | lttng_process_attr_to_string(process_attr), | |
1180 | integral_value); | |
1181 | } | |
a7a533cd | 1182 | end: |
159b042f | 1183 | return ret_code; |
a5dfbb9d MD |
1184 | } |
1185 | ||
aaf26714 | 1186 | /* |
050349bb DG |
1187 | * Create kernel metadata, open from the kernel tracer and add it to the |
1188 | * kernel session. | |
aaf26714 | 1189 | */ |
a4b92340 | 1190 | int kernel_open_metadata(struct ltt_kernel_session *session) |
aaf26714 DG |
1191 | { |
1192 | int ret; | |
74024a21 | 1193 | struct ltt_kernel_metadata *lkm = NULL; |
aaf26714 | 1194 | |
a0377dfe | 1195 | LTTNG_ASSERT(session); |
0525e9ae | 1196 | |
54012638 | 1197 | /* Allocate kernel metadata */ |
a4b92340 | 1198 | lkm = trace_kernel_create_metadata(); |
54012638 | 1199 | if (lkm == NULL) { |
aaf26714 DG |
1200 | goto error; |
1201 | } | |
1202 | ||
54012638 | 1203 | /* Kernel tracer metadata creation */ |
f3ed775e | 1204 | ret = kernctl_open_metadata(session->fd, &lkm->conf->attr); |
aaf26714 | 1205 | if (ret < 0) { |
74024a21 | 1206 | goto error_open; |
aaf26714 DG |
1207 | } |
1208 | ||
8c0faa1d | 1209 | lkm->fd = ret; |
d40f0359 | 1210 | lkm->key = ++next_kernel_channel_key; |
7b395890 DG |
1211 | /* Prevent fd duplication after execlp() */ |
1212 | ret = fcntl(lkm->fd, F_SETFD, FD_CLOEXEC); | |
1213 | if (ret < 0) { | |
df0f840b | 1214 | PERROR("fcntl session fd"); |
7b395890 DG |
1215 | } |
1216 | ||
aaf26714 | 1217 | session->metadata = lkm; |
8c0faa1d | 1218 | |
00e2e675 | 1219 | DBG("Kernel metadata opened (fd: %d)", lkm->fd); |
8c0faa1d DG |
1220 | |
1221 | return 0; | |
1222 | ||
74024a21 DG |
1223 | error_open: |
1224 | trace_kernel_destroy_metadata(lkm); | |
8c0faa1d | 1225 | error: |
54012638 | 1226 | return -1; |
8c0faa1d DG |
1227 | } |
1228 | ||
1229 | /* | |
050349bb | 1230 | * Start tracing session. |
8c0faa1d DG |
1231 | */ |
1232 | int kernel_start_session(struct ltt_kernel_session *session) | |
1233 | { | |
1234 | int ret; | |
1235 | ||
a0377dfe | 1236 | LTTNG_ASSERT(session); |
0525e9ae | 1237 | |
8c0faa1d DG |
1238 | ret = kernctl_start_session(session->fd); |
1239 | if (ret < 0) { | |
df0f840b | 1240 | PERROR("ioctl start session"); |
8c0faa1d DG |
1241 | goto error; |
1242 | } | |
1243 | ||
1244 | DBG("Kernel session started"); | |
1245 | ||
1246 | return 0; | |
1247 | ||
1248 | error: | |
1249 | return ret; | |
1250 | } | |
1251 | ||
f3ed775e | 1252 | /* |
050349bb | 1253 | * Make a kernel wait to make sure in-flight probe have completed. |
f3ed775e | 1254 | */ |
7d268848 | 1255 | void kernel_wait_quiescent(void) |
f3ed775e DG |
1256 | { |
1257 | int ret; | |
7d268848 | 1258 | int fd = kernel_tracer_fd; |
f3ed775e DG |
1259 | |
1260 | DBG("Kernel quiescent wait on %d", fd); | |
1261 | ||
1262 | ret = kernctl_wait_quiescent(fd); | |
1263 | if (ret < 0) { | |
df0f840b | 1264 | PERROR("wait quiescent ioctl"); |
f3ed775e DG |
1265 | ERR("Kernel quiescent wait failed"); |
1266 | } | |
1267 | } | |
1268 | ||
1269 | /* | |
f3ed775e DG |
1270 | * Force flush buffer of metadata. |
1271 | */ | |
1272 | int kernel_metadata_flush_buffer(int fd) | |
1273 | { | |
1274 | int ret; | |
1275 | ||
169d2cb7 DG |
1276 | DBG("Kernel flushing metadata buffer on fd %d", fd); |
1277 | ||
f3ed775e DG |
1278 | ret = kernctl_buffer_flush(fd); |
1279 | if (ret < 0) { | |
00e2e675 | 1280 | ERR("Fail to flush metadata buffers %d (ret: %d)", fd, ret); |
f3ed775e DG |
1281 | } |
1282 | ||
1283 | return 0; | |
1284 | } | |
1285 | ||
1286 | /* | |
050349bb | 1287 | * Force flush buffer for channel. |
f3ed775e DG |
1288 | */ |
1289 | int kernel_flush_buffer(struct ltt_kernel_channel *channel) | |
1290 | { | |
1291 | int ret; | |
1292 | struct ltt_kernel_stream *stream; | |
1293 | ||
a0377dfe | 1294 | LTTNG_ASSERT(channel); |
0525e9ae | 1295 | |
f3ed775e DG |
1296 | DBG("Flush buffer for channel %s", channel->channel->name); |
1297 | ||
1298 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { | |
1299 | DBG("Flushing channel stream %d", stream->fd); | |
1300 | ret = kernctl_buffer_flush(stream->fd); | |
1301 | if (ret < 0) { | |
df0f840b | 1302 | PERROR("ioctl"); |
f3ed775e DG |
1303 | ERR("Fail to flush buffer for stream %d (ret: %d)", |
1304 | stream->fd, ret); | |
1305 | } | |
1306 | } | |
1307 | ||
1308 | return 0; | |
1309 | } | |
1310 | ||
8c0faa1d | 1311 | /* |
050349bb | 1312 | * Stop tracing session. |
8c0faa1d DG |
1313 | */ |
1314 | int kernel_stop_session(struct ltt_kernel_session *session) | |
1315 | { | |
1316 | int ret; | |
1317 | ||
a0377dfe | 1318 | LTTNG_ASSERT(session); |
0525e9ae | 1319 | |
8c0faa1d DG |
1320 | ret = kernctl_stop_session(session->fd); |
1321 | if (ret < 0) { | |
1322 | goto error; | |
1323 | } | |
1324 | ||
1325 | DBG("Kernel session stopped"); | |
1326 | ||
1327 | return 0; | |
1328 | ||
1329 | error: | |
1330 | return ret; | |
1331 | } | |
1332 | ||
1333 | /* | |
050349bb DG |
1334 | * Open stream of channel, register it to the kernel tracer and add it |
1335 | * to the stream list of the channel. | |
8c0faa1d | 1336 | * |
1cfb4b98 MD |
1337 | * Note: given that the streams may appear in random order wrt CPU |
1338 | * number (e.g. cpu hotplug), the index value of the stream number in | |
1339 | * the stream name is not necessarily linked to the CPU number. | |
1340 | * | |
050349bb | 1341 | * Return the number of created stream. Else, a negative value. |
8c0faa1d | 1342 | */ |
f3ed775e | 1343 | int kernel_open_channel_stream(struct ltt_kernel_channel *channel) |
8c0faa1d | 1344 | { |
1cfb4b98 | 1345 | int ret; |
8c0faa1d DG |
1346 | struct ltt_kernel_stream *lks; |
1347 | ||
a0377dfe | 1348 | LTTNG_ASSERT(channel); |
0525e9ae | 1349 | |
5a47c6a2 | 1350 | while ((ret = kernctl_create_stream(channel->fd)) >= 0) { |
1cfb4b98 MD |
1351 | lks = trace_kernel_create_stream(channel->channel->name, |
1352 | channel->stream_count); | |
8c0faa1d | 1353 | if (lks == NULL) { |
799e2c4f MD |
1354 | ret = close(ret); |
1355 | if (ret) { | |
1356 | PERROR("close"); | |
1357 | } | |
8c0faa1d DG |
1358 | goto error; |
1359 | } | |
1360 | ||
1361 | lks->fd = ret; | |
7b395890 DG |
1362 | /* Prevent fd duplication after execlp() */ |
1363 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); | |
1364 | if (ret < 0) { | |
df0f840b | 1365 | PERROR("fcntl session fd"); |
7b395890 DG |
1366 | } |
1367 | ||
1624d5b7 JD |
1368 | lks->tracefile_size = channel->channel->attr.tracefile_size; |
1369 | lks->tracefile_count = channel->channel->attr.tracefile_count; | |
1370 | ||
1cfb4b98 | 1371 | /* Add stream to channel stream list */ |
8c0faa1d DG |
1372 | cds_list_add(&lks->list, &channel->stream_list.head); |
1373 | channel->stream_count++; | |
8c0faa1d | 1374 | |
00e2e675 DG |
1375 | DBG("Kernel stream %s created (fd: %d, state: %d)", lks->name, lks->fd, |
1376 | lks->state); | |
54012638 | 1377 | } |
8c0faa1d DG |
1378 | |
1379 | return channel->stream_count; | |
1380 | ||
1381 | error: | |
54012638 | 1382 | return -1; |
8c0faa1d DG |
1383 | } |
1384 | ||
1385 | /* | |
050349bb | 1386 | * Open the metadata stream and set it to the kernel session. |
8c0faa1d | 1387 | */ |
f3ed775e | 1388 | int kernel_open_metadata_stream(struct ltt_kernel_session *session) |
8c0faa1d DG |
1389 | { |
1390 | int ret; | |
1391 | ||
a0377dfe | 1392 | LTTNG_ASSERT(session); |
0525e9ae | 1393 | |
8c0faa1d DG |
1394 | ret = kernctl_create_stream(session->metadata->fd); |
1395 | if (ret < 0) { | |
df0f840b | 1396 | PERROR("kernel create metadata stream"); |
8c0faa1d DG |
1397 | goto error; |
1398 | } | |
1399 | ||
1400 | DBG("Kernel metadata stream created (fd: %d)", ret); | |
1401 | session->metadata_stream_fd = ret; | |
7b395890 DG |
1402 | /* Prevent fd duplication after execlp() */ |
1403 | ret = fcntl(session->metadata_stream_fd, F_SETFD, FD_CLOEXEC); | |
1404 | if (ret < 0) { | |
df0f840b | 1405 | PERROR("fcntl session fd"); |
7b395890 | 1406 | } |
aaf26714 DG |
1407 | |
1408 | return 0; | |
1409 | ||
1410 | error: | |
54012638 | 1411 | return -1; |
aaf26714 | 1412 | } |
2ef84c95 DG |
1413 | |
1414 | /* | |
9f19cc17 | 1415 | * Get the event list from the kernel tracer and return the number of elements. |
2ef84c95 | 1416 | */ |
7d268848 | 1417 | ssize_t kernel_list_events(struct lttng_event **events) |
2ef84c95 | 1418 | { |
53efb85a | 1419 | int fd, ret; |
9f19cc17 DG |
1420 | char *event; |
1421 | size_t nbmem, count = 0; | |
2ef84c95 | 1422 | FILE *fp; |
9f19cc17 | 1423 | struct lttng_event *elist; |
2ef84c95 | 1424 | |
a0377dfe | 1425 | LTTNG_ASSERT(events); |
0525e9ae | 1426 | |
7d268848 | 1427 | fd = kernctl_tracepoint_list(kernel_tracer_fd); |
2ef84c95 | 1428 | if (fd < 0) { |
df0f840b | 1429 | PERROR("kernel tracepoint list"); |
2ef84c95 DG |
1430 | goto error; |
1431 | } | |
1432 | ||
1433 | fp = fdopen(fd, "r"); | |
1434 | if (fp == NULL) { | |
df0f840b | 1435 | PERROR("kernel tracepoint list fdopen"); |
61b73b12 | 1436 | goto error_fp; |
2ef84c95 DG |
1437 | } |
1438 | ||
1439 | /* | |
1440 | * Init memory size counter | |
1441 | * See kernel-ctl.h for explanation of this value | |
1442 | */ | |
6725fe19 | 1443 | nbmem = KERNEL_EVENT_INIT_LIST_SIZE; |
64803277 | 1444 | elist = calloc<lttng_event>(nbmem); |
3b870559 MD |
1445 | if (elist == NULL) { |
1446 | PERROR("alloc list events"); | |
1447 | count = -ENOMEM; | |
1448 | goto end; | |
1449 | } | |
2ef84c95 | 1450 | |
53efb85a | 1451 | while (fscanf(fp, "event { name = %m[^;]; };\n", &event) == 1) { |
6725fe19 | 1452 | if (count >= nbmem) { |
3b870559 | 1453 | struct lttng_event *new_elist; |
53efb85a | 1454 | size_t new_nbmem; |
3b870559 | 1455 | |
53efb85a MD |
1456 | new_nbmem = nbmem << 1; |
1457 | DBG("Reallocating event list from %zu to %zu bytes", | |
1458 | nbmem, new_nbmem); | |
7966af57 | 1459 | new_elist = (lttng_event *) realloc(elist, new_nbmem * sizeof(struct lttng_event)); |
3b870559 | 1460 | if (new_elist == NULL) { |
df0f840b | 1461 | PERROR("realloc list events"); |
3b870559 MD |
1462 | free(event); |
1463 | free(elist); | |
61b73b12 MD |
1464 | count = -ENOMEM; |
1465 | goto end; | |
2ef84c95 | 1466 | } |
53efb85a MD |
1467 | /* Zero the new memory */ |
1468 | memset(new_elist + nbmem, 0, | |
1469 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); | |
1470 | nbmem = new_nbmem; | |
3b870559 | 1471 | elist = new_elist; |
2ef84c95 | 1472 | } |
99497cd0 MD |
1473 | strncpy(elist[count].name, event, LTTNG_SYMBOL_NAME_LEN); |
1474 | elist[count].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
67b9d018 | 1475 | elist[count].enabled = -1; |
9f19cc17 | 1476 | count++; |
3b870559 | 1477 | free(event); |
2ef84c95 DG |
1478 | } |
1479 | ||
9f19cc17 | 1480 | *events = elist; |
ced2f820 | 1481 | DBG("Kernel list events done (%zu events)", count); |
61b73b12 | 1482 | end: |
799e2c4f MD |
1483 | ret = fclose(fp); /* closes both fp and fd */ |
1484 | if (ret) { | |
1485 | PERROR("fclose"); | |
1486 | } | |
9f19cc17 | 1487 | return count; |
2ef84c95 | 1488 | |
61b73b12 | 1489 | error_fp: |
799e2c4f MD |
1490 | ret = close(fd); |
1491 | if (ret) { | |
1492 | PERROR("close"); | |
1493 | } | |
2ef84c95 DG |
1494 | error: |
1495 | return -1; | |
1496 | } | |
096102bd DG |
1497 | |
1498 | /* | |
1499 | * Get kernel version and validate it. | |
1500 | */ | |
b8e2fb80 FD |
1501 | int kernel_validate_version(struct lttng_kernel_abi_tracer_version *version, |
1502 | struct lttng_kernel_abi_tracer_abi_version *abi_version) | |
096102bd DG |
1503 | { |
1504 | int ret; | |
096102bd | 1505 | |
7d268848 | 1506 | ret = kernctl_tracer_version(kernel_tracer_fd, version); |
096102bd | 1507 | if (ret < 0) { |
521dd134 | 1508 | ERR("Failed to retrieve the lttng-modules version"); |
096102bd DG |
1509 | goto error; |
1510 | } | |
1511 | ||
1512 | /* Validate version */ | |
88076e89 | 1513 | if (version->major != VERSION_MAJOR) { |
c052142c | 1514 | ERR("Kernel tracer major version (%d) is not compatible with lttng-tools major version (%d)", |
88076e89 | 1515 | version->major, VERSION_MAJOR); |
096102bd | 1516 | goto error_version; |
096102bd | 1517 | } |
7d268848 | 1518 | ret = kernctl_tracer_abi_version(kernel_tracer_fd, abi_version); |
c052142c | 1519 | if (ret < 0) { |
521dd134 | 1520 | ERR("Failed to retrieve lttng-modules ABI version"); |
c052142c MD |
1521 | goto error; |
1522 | } | |
b8e2fb80 | 1523 | if (abi_version->major != LTTNG_KERNEL_ABI_MAJOR_VERSION) { |
521dd134 | 1524 | ERR("Kernel tracer ABI version (%d.%d) does not match the expected ABI major version (%d.*)", |
88076e89 | 1525 | abi_version->major, abi_version->minor, |
b8e2fb80 | 1526 | LTTNG_KERNEL_ABI_MAJOR_VERSION); |
c052142c MD |
1527 | goto error; |
1528 | } | |
1529 | DBG2("Kernel tracer version validated (%d.%d, ABI %d.%d)", | |
88076e89 JD |
1530 | version->major, version->minor, |
1531 | abi_version->major, abi_version->minor); | |
096102bd DG |
1532 | return 0; |
1533 | ||
1534 | error_version: | |
096102bd DG |
1535 | ret = -1; |
1536 | ||
1537 | error: | |
521dd134 | 1538 | ERR("Kernel tracer version check failed; kernel tracing will not be available"); |
096102bd DG |
1539 | return ret; |
1540 | } | |
335a95b7 MD |
1541 | |
1542 | /* | |
1543 | * Kernel work-arounds called at the start of sessiond main(). | |
1544 | */ | |
1545 | int init_kernel_workarounds(void) | |
1546 | { | |
8936c33a | 1547 | int ret; |
335a95b7 MD |
1548 | FILE *fp; |
1549 | ||
1550 | /* | |
1551 | * boot_id needs to be read once before being used concurrently | |
1552 | * to deal with a Linux kernel race. A fix is proposed for | |
1553 | * upstream, but the work-around is needed for older kernels. | |
1554 | */ | |
1555 | fp = fopen("/proc/sys/kernel/random/boot_id", "r"); | |
1556 | if (!fp) { | |
1557 | goto end_boot_id; | |
1558 | } | |
1559 | while (!feof(fp)) { | |
1560 | char buf[37] = ""; | |
1561 | ||
8936c33a DG |
1562 | ret = fread(buf, 1, sizeof(buf), fp); |
1563 | if (ret < 0) { | |
1564 | /* Ignore error, we don't really care */ | |
1565 | } | |
335a95b7 | 1566 | } |
799e2c4f MD |
1567 | ret = fclose(fp); |
1568 | if (ret) { | |
1569 | PERROR("fclose"); | |
1570 | } | |
335a95b7 | 1571 | end_boot_id: |
335a95b7 MD |
1572 | return 0; |
1573 | } | |
2f77fc4b DG |
1574 | |
1575 | /* | |
d070c424 | 1576 | * Teardown of a kernel session, keeping data required by destroy notifiers. |
2f77fc4b DG |
1577 | */ |
1578 | void kernel_destroy_session(struct ltt_kernel_session *ksess) | |
1579 | { | |
82b69413 JG |
1580 | struct lttng_trace_chunk *trace_chunk; |
1581 | ||
2f77fc4b DG |
1582 | if (ksess == NULL) { |
1583 | DBG3("No kernel session when tearing down session"); | |
1584 | return; | |
1585 | } | |
1586 | ||
1587 | DBG("Tearing down kernel session"); | |
82b69413 | 1588 | trace_chunk = ksess->current_trace_chunk; |
2f77fc4b | 1589 | |
07b86b52 | 1590 | /* |
15dc512a DG |
1591 | * Destroy channels on the consumer if at least one FD has been sent and we |
1592 | * are in no output mode because the streams are in *no* monitor mode so we | |
1593 | * have to send a command to clean them up or else they leaked. | |
07b86b52 | 1594 | */ |
15dc512a | 1595 | if (!ksess->output_traces && ksess->consumer_fds_sent) { |
07b86b52 JD |
1596 | int ret; |
1597 | struct consumer_socket *socket; | |
1598 | struct lttng_ht_iter iter; | |
1599 | ||
1600 | /* For each consumer socket. */ | |
d069d577 | 1601 | rcu_read_lock(); |
07b86b52 JD |
1602 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, |
1603 | socket, node.node) { | |
1604 | struct ltt_kernel_channel *chan; | |
1605 | ||
1606 | /* For each channel, ask the consumer to destroy it. */ | |
1607 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { | |
1608 | ret = kernel_consumer_destroy_channel(socket, chan); | |
1609 | if (ret < 0) { | |
1610 | /* Consumer is probably dead. Use next socket. */ | |
1611 | continue; | |
1612 | } | |
1613 | } | |
1614 | } | |
d069d577 | 1615 | rcu_read_unlock(); |
07b86b52 JD |
1616 | } |
1617 | ||
2f77fc4b DG |
1618 | /* Close any relayd session */ |
1619 | consumer_output_send_destroy_relayd(ksess->consumer); | |
1620 | ||
1621 | trace_kernel_destroy_session(ksess); | |
82b69413 | 1622 | lttng_trace_chunk_put(trace_chunk); |
2f77fc4b | 1623 | } |
fb5f35b6 | 1624 | |
d070c424 MD |
1625 | /* Teardown of data required by destroy notifiers. */ |
1626 | void kernel_free_session(struct ltt_kernel_session *ksess) | |
1627 | { | |
1628 | if (ksess == NULL) { | |
1629 | return; | |
1630 | } | |
1631 | trace_kernel_free_session(ksess); | |
1632 | } | |
1633 | ||
fb5f35b6 DG |
1634 | /* |
1635 | * Destroy a kernel channel object. It does not do anything on the tracer side. | |
1636 | */ | |
1637 | void kernel_destroy_channel(struct ltt_kernel_channel *kchan) | |
1638 | { | |
1639 | struct ltt_kernel_session *ksess = NULL; | |
1640 | ||
a0377dfe FD |
1641 | LTTNG_ASSERT(kchan); |
1642 | LTTNG_ASSERT(kchan->channel); | |
fb5f35b6 DG |
1643 | |
1644 | DBG3("Kernel destroy channel %s", kchan->channel->name); | |
1645 | ||
1646 | /* Update channel count of associated session. */ | |
1647 | if (kchan->session) { | |
1648 | /* Keep pointer reference so we can update it after the destroy. */ | |
1649 | ksess = kchan->session; | |
1650 | } | |
1651 | ||
1652 | trace_kernel_destroy_channel(kchan); | |
1653 | ||
1654 | /* | |
1655 | * At this point the kernel channel is not visible anymore. This is safe | |
1656 | * since in order to work on a visible kernel session, the tracing session | |
1657 | * lock (ltt_session.lock) MUST be acquired. | |
1658 | */ | |
1659 | if (ksess) { | |
1660 | ksess->channel_count--; | |
1661 | } | |
1662 | } | |
6dc3064a DG |
1663 | |
1664 | /* | |
1665 | * Take a snapshot for a given kernel session. | |
1666 | * | |
9a654598 | 1667 | * Return LTTNG_OK on success or else return a LTTNG_ERR code. |
6dc3064a | 1668 | */ |
fb9a95c4 JG |
1669 | enum lttng_error_code kernel_snapshot_record( |
1670 | struct ltt_kernel_session *ksess, | |
f46376a1 | 1671 | const struct consumer_output *output, |
d07ceecd | 1672 | uint64_t nb_packets_per_stream) |
6dc3064a | 1673 | { |
2a06df8d | 1674 | int err, ret, saved_metadata_fd; |
9a654598 | 1675 | enum lttng_error_code status = LTTNG_OK; |
6dc3064a DG |
1676 | struct consumer_socket *socket; |
1677 | struct lttng_ht_iter iter; | |
1678 | struct ltt_kernel_metadata *saved_metadata; | |
3b967712 | 1679 | char *trace_path = NULL; |
5da88b0f | 1680 | size_t consumer_path_offset = 0; |
6dc3064a | 1681 | |
a0377dfe FD |
1682 | LTTNG_ASSERT(ksess); |
1683 | LTTNG_ASSERT(ksess->consumer); | |
1684 | LTTNG_ASSERT(output); | |
6dc3064a DG |
1685 | |
1686 | DBG("Kernel snapshot record started"); | |
1687 | ||
1688 | /* Save current metadata since the following calls will change it. */ | |
1689 | saved_metadata = ksess->metadata; | |
1690 | saved_metadata_fd = ksess->metadata_stream_fd; | |
1691 | ||
1692 | rcu_read_lock(); | |
1693 | ||
1694 | ret = kernel_open_metadata(ksess); | |
1695 | if (ret < 0) { | |
9a654598 | 1696 | status = LTTNG_ERR_KERN_META_FAIL; |
6dc3064a DG |
1697 | goto error; |
1698 | } | |
1699 | ||
1700 | ret = kernel_open_metadata_stream(ksess); | |
1701 | if (ret < 0) { | |
9a654598 | 1702 | status = LTTNG_ERR_KERN_META_FAIL; |
6dc3064a DG |
1703 | goto error_open_stream; |
1704 | } | |
1705 | ||
3b967712 | 1706 | trace_path = setup_channel_trace_path(ksess->consumer, |
bd666153 | 1707 | "", &consumer_path_offset); |
3b967712 MD |
1708 | if (!trace_path) { |
1709 | status = LTTNG_ERR_INVALID; | |
1710 | goto error; | |
1711 | } | |
6dc3064a | 1712 | /* Send metadata to consumer and snapshot everything. */ |
348a81dc | 1713 | cds_lfht_for_each_entry(output->socks->ht, &iter.iter, |
6dc3064a | 1714 | socket, node.node) { |
6dc3064a | 1715 | struct ltt_kernel_channel *chan; |
6dc3064a | 1716 | |
6dc3064a DG |
1717 | pthread_mutex_lock(socket->lock); |
1718 | /* This stream must not be monitored by the consumer. */ | |
07b86b52 | 1719 | ret = kernel_consumer_add_metadata(socket, ksess, 0); |
6dc3064a | 1720 | pthread_mutex_unlock(socket->lock); |
6dc3064a | 1721 | if (ret < 0) { |
0ed78e50 | 1722 | status = LTTNG_ERR_KERN_META_FAIL; |
6dc3064a DG |
1723 | goto error_consumer; |
1724 | } | |
1725 | ||
1726 | /* For each channel, ask the consumer to snapshot it. */ | |
1727 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { | |
9a654598 | 1728 | status = consumer_snapshot_channel(socket, chan->key, output, 0, |
f46376a1 | 1729 | &trace_path[consumer_path_offset], |
d2956687 | 1730 | nb_packets_per_stream); |
9a654598 | 1731 | if (status != LTTNG_OK) { |
2a06df8d DG |
1732 | (void) kernel_consumer_destroy_metadata(socket, |
1733 | ksess->metadata); | |
6dc3064a DG |
1734 | goto error_consumer; |
1735 | } | |
1736 | } | |
1737 | ||
1738 | /* Snapshot metadata, */ | |
9a654598 | 1739 | status = consumer_snapshot_channel(socket, ksess->metadata->key, output, |
f46376a1 | 1740 | 1, &trace_path[consumer_path_offset], 0); |
9a654598 | 1741 | if (status != LTTNG_OK) { |
6dc3064a DG |
1742 | goto error_consumer; |
1743 | } | |
07b86b52 JD |
1744 | |
1745 | /* | |
1746 | * The metadata snapshot is done, ask the consumer to destroy it since | |
1747 | * it's not monitored on the consumer side. | |
1748 | */ | |
1749 | (void) kernel_consumer_destroy_metadata(socket, ksess->metadata); | |
6dc3064a DG |
1750 | } |
1751 | ||
1752 | error_consumer: | |
1753 | /* Close newly opened metadata stream. It's now on the consumer side. */ | |
2a06df8d DG |
1754 | err = close(ksess->metadata_stream_fd); |
1755 | if (err < 0) { | |
6dc3064a DG |
1756 | PERROR("close snapshot kernel"); |
1757 | } | |
1758 | ||
1759 | error_open_stream: | |
1760 | trace_kernel_destroy_metadata(ksess->metadata); | |
1761 | error: | |
1762 | /* Restore metadata state.*/ | |
1763 | ksess->metadata = saved_metadata; | |
1764 | ksess->metadata_stream_fd = saved_metadata_fd; | |
6dc3064a | 1765 | rcu_read_unlock(); |
3b967712 | 1766 | free(trace_path); |
9a654598 | 1767 | return status; |
6dc3064a | 1768 | } |
834978fd DG |
1769 | |
1770 | /* | |
1771 | * Get the syscall mask array from the kernel tracer. | |
1772 | * | |
1773 | * Return 0 on success else a negative value. In both case, syscall_mask should | |
1774 | * be freed. | |
1775 | */ | |
1776 | int kernel_syscall_mask(int chan_fd, char **syscall_mask, uint32_t *nr_bits) | |
1777 | { | |
a0377dfe FD |
1778 | LTTNG_ASSERT(syscall_mask); |
1779 | LTTNG_ASSERT(nr_bits); | |
834978fd DG |
1780 | |
1781 | return kernctl_syscall_mask(chan_fd, syscall_mask, nr_bits); | |
1782 | } | |
6e21424e | 1783 | |
959e3c66 JR |
1784 | static |
1785 | int kernel_tracer_abi_greater_or_equal(unsigned int major, unsigned int minor) | |
6e21424e | 1786 | { |
959e3c66 | 1787 | int ret; |
b8e2fb80 | 1788 | struct lttng_kernel_abi_tracer_abi_version abi; |
6e21424e | 1789 | |
7d268848 | 1790 | ret = kernctl_tracer_abi_version(kernel_tracer_fd, &abi); |
6e21424e JR |
1791 | if (ret < 0) { |
1792 | ERR("Failed to retrieve lttng-modules ABI version"); | |
1793 | goto error; | |
1794 | } | |
1795 | ||
959e3c66 JR |
1796 | ret = abi.major > major || (abi.major == major && abi.minor >= minor); |
1797 | error: | |
1798 | return ret; | |
1799 | } | |
1800 | ||
1801 | /* | |
1802 | * Check for the support of the RING_BUFFER_SNAPSHOT_SAMPLE_POSITIONS via abi | |
1803 | * version number. | |
1804 | * | |
1805 | * Return 1 on success, 0 when feature is not supported, negative value in case | |
1806 | * of errors. | |
1807 | */ | |
1808 | int kernel_supports_ring_buffer_snapshot_sample_positions(void) | |
1809 | { | |
6e21424e JR |
1810 | /* |
1811 | * RING_BUFFER_SNAPSHOT_SAMPLE_POSITIONS was introduced in 2.3 | |
1812 | */ | |
959e3c66 | 1813 | return kernel_tracer_abi_greater_or_equal(2, 3); |
6e21424e | 1814 | } |
5c408ad8 | 1815 | |
a40a503f MD |
1816 | /* |
1817 | * Check for the support of the packet sequence number via abi version number. | |
1818 | * | |
1819 | * Return 1 on success, 0 when feature is not supported, negative value in case | |
1820 | * of errors. | |
1821 | */ | |
1822 | int kernel_supports_ring_buffer_packet_sequence_number(void) | |
1823 | { | |
a40a503f | 1824 | /* |
3029bc92 JG |
1825 | * Packet sequence number was introduced in LTTng 2.8, |
1826 | * lttng-modules ABI 2.1. | |
a40a503f | 1827 | */ |
959e3c66 JR |
1828 | return kernel_tracer_abi_greater_or_equal(2, 1); |
1829 | } | |
1830 | ||
1831 | /* | |
1832 | * Check for the support of event notifiers via abi version number. | |
1833 | * | |
1834 | * Return 1 on success, 0 when feature is not supported, negative value in case | |
1835 | * of errors. | |
1836 | */ | |
1837 | int kernel_supports_event_notifiers(void) | |
1838 | { | |
1839 | /* | |
1840 | * Event notifiers were introduced in LTTng 2.13, lttng-modules ABI 2.6. | |
1841 | */ | |
1842 | return kernel_tracer_abi_greater_or_equal(2, 6); | |
a40a503f MD |
1843 | } |
1844 | ||
346732ae JR |
1845 | /* |
1846 | * Check for the support of ctf2 via abi version number. | |
1847 | * | |
1848 | * Return 1 on success, 0 when feature is not supported, negative value in case | |
1849 | * of errors. | |
1850 | */ | |
1851 | int kernel_supports_ctf2(void) | |
1852 | { | |
1853 | /* | |
1854 | * JORAJ TODO: change this for the actual value when merged upstream | |
1855 | * default to 2.7 ABI for now (modules 2.14) | |
1856 | * CTF2 support was introduced in LTTng 2.1XX, lttng-modules ABI 2.XX. | |
1857 | */ | |
1858 | return kernel_tracer_abi_greater_or_equal(2, 7); | |
1859 | } | |
1860 | ||
5c408ad8 JD |
1861 | /* |
1862 | * Rotate a kernel session. | |
1863 | * | |
d5a1b7aa | 1864 | * Return LTTNG_OK on success or else an LTTng error code. |
5c408ad8 | 1865 | */ |
d5a1b7aa | 1866 | enum lttng_error_code kernel_rotate_session(struct ltt_session *session) |
5c408ad8 JD |
1867 | { |
1868 | int ret; | |
d5a1b7aa | 1869 | enum lttng_error_code status = LTTNG_OK; |
5c408ad8 JD |
1870 | struct consumer_socket *socket; |
1871 | struct lttng_ht_iter iter; | |
1872 | struct ltt_kernel_session *ksess = session->kernel_session; | |
1873 | ||
a0377dfe FD |
1874 | LTTNG_ASSERT(ksess); |
1875 | LTTNG_ASSERT(ksess->consumer); | |
5c408ad8 JD |
1876 | |
1877 | DBG("Rotate kernel session %s started (session %" PRIu64 ")", | |
1878 | session->name, session->id); | |
1879 | ||
1880 | rcu_read_lock(); | |
1881 | ||
1882 | /* | |
1883 | * Note that this loop will end after one iteration given that there is | |
1884 | * only one kernel consumer. | |
1885 | */ | |
1886 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, | |
1887 | socket, node.node) { | |
1888 | struct ltt_kernel_channel *chan; | |
1889 | ||
b8a1b0bd | 1890 | /* For each channel, ask the consumer to rotate it. */ |
5c408ad8 | 1891 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { |
92816cc3 JG |
1892 | DBG("Rotate kernel channel %" PRIu64 ", session %s", |
1893 | chan->key, session->name); | |
5c408ad8 | 1894 | ret = consumer_rotate_channel(socket, chan->key, |
f46376a1 | 1895 | ksess->consumer, |
d2956687 | 1896 | /* is_metadata_channel */ false); |
5c408ad8 | 1897 | if (ret < 0) { |
7e0de219 | 1898 | status = LTTNG_ERR_ROTATION_FAIL_CONSUMER; |
5c408ad8 JD |
1899 | goto error; |
1900 | } | |
1901 | } | |
1902 | ||
1903 | /* | |
1904 | * Rotate the metadata channel. | |
1905 | */ | |
22a1b931 | 1906 | ret = consumer_rotate_channel(socket, ksess->metadata->key, |
f46376a1 | 1907 | ksess->consumer, |
d2956687 | 1908 | /* is_metadata_channel */ true); |
5c408ad8 | 1909 | if (ret < 0) { |
7e0de219 | 1910 | status = LTTNG_ERR_ROTATION_FAIL_CONSUMER; |
5c408ad8 JD |
1911 | goto error; |
1912 | } | |
1913 | } | |
1914 | ||
5c408ad8 JD |
1915 | error: |
1916 | rcu_read_unlock(); | |
d5a1b7aa | 1917 | return status; |
5c408ad8 | 1918 | } |
d2956687 JG |
1919 | |
1920 | enum lttng_error_code kernel_create_channel_subdirectories( | |
1921 | const struct ltt_kernel_session *ksess) | |
1922 | { | |
1923 | enum lttng_error_code ret = LTTNG_OK; | |
1924 | enum lttng_trace_chunk_status chunk_status; | |
1925 | ||
1926 | rcu_read_lock(); | |
a0377dfe | 1927 | LTTNG_ASSERT(ksess->current_trace_chunk); |
d2956687 JG |
1928 | |
1929 | /* | |
1930 | * Create the index subdirectory which will take care | |
1931 | * of implicitly creating the channel's path. | |
1932 | */ | |
1933 | chunk_status = lttng_trace_chunk_create_subdirectory( | |
1934 | ksess->current_trace_chunk, | |
1935 | DEFAULT_KERNEL_TRACE_DIR "/" DEFAULT_INDEX_DIR); | |
1936 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
1937 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
1938 | goto error; | |
1939 | } | |
1940 | error: | |
1941 | rcu_read_unlock(); | |
1942 | return ret; | |
1943 | } | |
7d268848 MD |
1944 | |
1945 | /* | |
1946 | * Setup necessary data for kernel tracer action. | |
1947 | */ | |
7d268848 MD |
1948 | int init_kernel_tracer(void) |
1949 | { | |
1950 | int ret; | |
1951 | bool is_root = !getuid(); | |
1952 | ||
1953 | /* Modprobe lttng kernel modules */ | |
1954 | ret = modprobe_lttng_control(); | |
1955 | if (ret < 0) { | |
1956 | goto error; | |
1957 | } | |
1958 | ||
1959 | /* Open debugfs lttng */ | |
1960 | kernel_tracer_fd = open(module_proc_lttng, O_RDWR); | |
1961 | if (kernel_tracer_fd < 0) { | |
1962 | DBG("Failed to open %s", module_proc_lttng); | |
1963 | goto error_open; | |
1964 | } | |
1965 | ||
1966 | /* Validate kernel version */ | |
412d7227 SM |
1967 | ret = kernel_validate_version(&the_kernel_tracer_version, |
1968 | &the_kernel_tracer_abi_version); | |
7d268848 MD |
1969 | if (ret < 0) { |
1970 | goto error_version; | |
1971 | } | |
1972 | ||
1973 | ret = modprobe_lttng_data(); | |
1974 | if (ret < 0) { | |
1975 | goto error_modules; | |
1976 | } | |
1977 | ||
1978 | ret = kernel_supports_ring_buffer_snapshot_sample_positions(); | |
1979 | if (ret < 0) { | |
1980 | goto error_modules; | |
1981 | } | |
7d268848 MD |
1982 | if (ret < 1) { |
1983 | WARN("Kernel tracer does not support buffer monitoring. " | |
1984 | "The monitoring timer of channels in the kernel domain " | |
1985 | "will be set to 0 (disabled)."); | |
1986 | } | |
1987 | ||
352b58f5 JR |
1988 | ret = kernel_supports_event_notifiers(); |
1989 | if (ret < 0) { | |
1990 | ERR("Failed to check for kernel tracer event notifier support"); | |
1991 | goto error_modules; | |
1992 | } | |
1993 | ret = kernel_create_event_notifier_group(&kernel_tracer_event_notifier_group_fd); | |
1994 | if (ret < 0) { | |
1995 | /* This is not fatal. */ | |
1996 | WARN("Failed to create kernel event notifier group"); | |
1997 | kernel_tracer_event_notifier_group_fd = -1; | |
1998 | } else { | |
90aa04a1 FD |
1999 | enum event_notifier_error_accounting_status error_accounting_status; |
2000 | enum lttng_error_code error_code_ret = | |
352b58f5 JR |
2001 | kernel_create_event_notifier_group_notification_fd( |
2002 | &kernel_tracer_event_notifier_group_notification_fd); | |
2003 | ||
2004 | if (error_code_ret != LTTNG_OK) { | |
2005 | goto error_modules; | |
2006 | } | |
2007 | ||
90aa04a1 FD |
2008 | error_accounting_status = event_notifier_error_accounting_register_kernel( |
2009 | kernel_tracer_event_notifier_group_fd); | |
2010 | if (error_accounting_status != EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK) { | |
2011 | ERR("Failed to initialize event notifier error accounting for kernel tracer"); | |
2012 | error_code_ret = LTTNG_ERR_EVENT_NOTIFIER_ERROR_ACCOUNTING; | |
2013 | goto error_modules; | |
2014 | } | |
2015 | ||
352b58f5 JR |
2016 | kernel_token_to_event_notifier_rule_ht = cds_lfht_new( |
2017 | DEFAULT_HT_SIZE, 1, 0, | |
2018 | CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, | |
2019 | NULL); | |
2020 | if (!kernel_token_to_event_notifier_rule_ht) { | |
2021 | goto error_token_ht; | |
2022 | } | |
2023 | } | |
2024 | ||
2025 | DBG("Kernel tracer initialized: kernel tracer fd = %d, event notifier group fd = %d, event notifier group notification fd = %d", | |
2026 | kernel_tracer_fd, kernel_tracer_event_notifier_group_fd, | |
2027 | kernel_tracer_event_notifier_group_notification_fd); | |
7d268848 MD |
2028 | |
2029 | ret = syscall_init_table(kernel_tracer_fd); | |
2030 | if (ret < 0) { | |
2031 | ERR("Unable to populate syscall table. Syscall tracing won't " | |
2032 | "work for this session daemon."); | |
2033 | } | |
352b58f5 | 2034 | |
7d268848 MD |
2035 | return 0; |
2036 | ||
2037 | error_version: | |
2038 | modprobe_remove_lttng_control(); | |
2039 | ret = close(kernel_tracer_fd); | |
2040 | if (ret) { | |
352b58f5 JR |
2041 | PERROR("Failed to close kernel tracer file descriptor: fd = %d", |
2042 | kernel_tracer_fd); | |
7d268848 | 2043 | } |
6dcf80d3 | 2044 | |
7d268848 MD |
2045 | kernel_tracer_fd = -1; |
2046 | return LTTNG_ERR_KERN_VERSION; | |
2047 | ||
352b58f5 JR |
2048 | |
2049 | error_token_ht: | |
2050 | ret = close(kernel_tracer_event_notifier_group_notification_fd); | |
2051 | if (ret) { | |
2052 | PERROR("Failed to close kernel tracer event notifier group notification file descriptor: fd = %d", | |
2053 | kernel_tracer_event_notifier_group_notification_fd); | |
2054 | } | |
2055 | ||
6dcf80d3 JG |
2056 | kernel_tracer_event_notifier_group_notification_fd = -1; |
2057 | ||
7d268848 | 2058 | error_modules: |
352b58f5 JR |
2059 | ret = close(kernel_tracer_event_notifier_group_fd); |
2060 | if (ret) { | |
2061 | PERROR("Failed to close kernel tracer event notifier group file descriptor: fd = %d", | |
2062 | kernel_tracer_event_notifier_group_fd); | |
2063 | } | |
2064 | ||
6dcf80d3 JG |
2065 | kernel_tracer_event_notifier_group_fd = -1; |
2066 | ||
7d268848 MD |
2067 | ret = close(kernel_tracer_fd); |
2068 | if (ret) { | |
352b58f5 JR |
2069 | PERROR("Failed to close kernel tracer file descriptor: fd = %d", |
2070 | kernel_tracer_fd); | |
7d268848 MD |
2071 | } |
2072 | ||
6dcf80d3 JG |
2073 | kernel_tracer_fd = -1; |
2074 | ||
7d268848 MD |
2075 | error_open: |
2076 | modprobe_remove_lttng_control(); | |
2077 | ||
2078 | error: | |
2079 | WARN("No kernel tracer available"); | |
2080 | kernel_tracer_fd = -1; | |
2081 | if (!is_root) { | |
2082 | return LTTNG_ERR_NEED_ROOT_SESSIOND; | |
2083 | } else { | |
2084 | return LTTNG_ERR_KERN_NA; | |
2085 | } | |
2086 | } | |
2087 | ||
7d268848 MD |
2088 | void cleanup_kernel_tracer(void) |
2089 | { | |
352b58f5 JR |
2090 | DBG2("Closing kernel event notifier group notification file descriptor"); |
2091 | if (kernel_tracer_event_notifier_group_notification_fd >= 0) { | |
b69a1b40 | 2092 | int ret = notification_thread_command_remove_tracer_event_source( |
412d7227 | 2093 | the_notification_thread_handle, |
352b58f5 JR |
2094 | kernel_tracer_event_notifier_group_notification_fd); |
2095 | if (ret != LTTNG_OK) { | |
2096 | ERR("Failed to remove kernel event notifier notification from notification thread"); | |
2097 | } | |
2098 | ||
2099 | ret = close(kernel_tracer_event_notifier_group_notification_fd); | |
2100 | if (ret) { | |
2101 | PERROR("Failed to close kernel event notifier group notification file descriptor: fd = %d", | |
2102 | kernel_tracer_event_notifier_group_notification_fd); | |
2103 | } | |
2104 | ||
2105 | kernel_tracer_event_notifier_group_notification_fd = -1; | |
2106 | } | |
2107 | ||
2108 | if (kernel_token_to_event_notifier_rule_ht) { | |
b69a1b40 JG |
2109 | const int ret = cds_lfht_destroy( |
2110 | kernel_token_to_event_notifier_rule_ht, NULL); | |
a0377dfe | 2111 | LTTNG_ASSERT(ret == 0); |
352b58f5 JR |
2112 | } |
2113 | ||
2114 | DBG2("Closing kernel event notifier group file descriptor"); | |
2115 | if (kernel_tracer_event_notifier_group_fd >= 0) { | |
b69a1b40 JG |
2116 | const int ret = close(kernel_tracer_event_notifier_group_fd); |
2117 | ||
352b58f5 JR |
2118 | if (ret) { |
2119 | PERROR("Failed to close kernel event notifier group file descriptor: fd = %d", | |
2120 | kernel_tracer_event_notifier_group_fd); | |
2121 | } | |
2122 | ||
2123 | kernel_tracer_event_notifier_group_fd = -1; | |
2124 | } | |
7d268848 MD |
2125 | |
2126 | DBG2("Closing kernel fd"); | |
2127 | if (kernel_tracer_fd >= 0) { | |
b69a1b40 JG |
2128 | const int ret = close(kernel_tracer_fd); |
2129 | ||
7d268848 | 2130 | if (ret) { |
352b58f5 JR |
2131 | PERROR("Failed to close kernel tracer file descriptor: fd = %d", |
2132 | kernel_tracer_fd); | |
7d268848 | 2133 | } |
352b58f5 | 2134 | |
7d268848 MD |
2135 | kernel_tracer_fd = -1; |
2136 | } | |
352b58f5 | 2137 | |
7d268848 MD |
2138 | free(syscall_table); |
2139 | } | |
2140 | ||
7d268848 MD |
2141 | bool kernel_tracer_is_initialized(void) |
2142 | { | |
2143 | return kernel_tracer_fd >= 0; | |
2144 | } | |
bca212a2 MD |
2145 | |
2146 | /* | |
2147 | * Clear a kernel session. | |
2148 | * | |
2149 | * Return LTTNG_OK on success or else an LTTng error code. | |
2150 | */ | |
2151 | enum lttng_error_code kernel_clear_session(struct ltt_session *session) | |
2152 | { | |
2153 | int ret; | |
2154 | enum lttng_error_code status = LTTNG_OK; | |
2155 | struct consumer_socket *socket; | |
2156 | struct lttng_ht_iter iter; | |
2157 | struct ltt_kernel_session *ksess = session->kernel_session; | |
2158 | ||
a0377dfe FD |
2159 | LTTNG_ASSERT(ksess); |
2160 | LTTNG_ASSERT(ksess->consumer); | |
bca212a2 MD |
2161 | |
2162 | DBG("Clear kernel session %s (session %" PRIu64 ")", | |
2163 | session->name, session->id); | |
2164 | ||
2165 | rcu_read_lock(); | |
2166 | ||
2167 | if (ksess->active) { | |
2168 | ERR("Expecting inactive session %s (%" PRIu64 ")", session->name, session->id); | |
2169 | status = LTTNG_ERR_FATAL; | |
2170 | goto end; | |
2171 | } | |
2172 | ||
2173 | /* | |
2174 | * Note that this loop will end after one iteration given that there is | |
2175 | * only one kernel consumer. | |
2176 | */ | |
2177 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, | |
2178 | socket, node.node) { | |
2179 | struct ltt_kernel_channel *chan; | |
2180 | ||
2181 | /* For each channel, ask the consumer to clear it. */ | |
2182 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { | |
2183 | DBG("Clear kernel channel %" PRIu64 ", session %s", | |
2184 | chan->key, session->name); | |
2185 | ret = consumer_clear_channel(socket, chan->key); | |
2186 | if (ret < 0) { | |
2187 | goto error; | |
2188 | } | |
2189 | } | |
2190 | ||
2191 | if (!ksess->metadata) { | |
2192 | /* | |
2193 | * Nothing to do for the metadata. | |
2194 | * This is a snapshot session. | |
2195 | * The metadata is genererated on the fly. | |
2196 | */ | |
2197 | continue; | |
2198 | } | |
2199 | ||
2200 | /* | |
2201 | * Clear the metadata channel. | |
2202 | * Metadata channel is not cleared per se but we still need to | |
2203 | * perform a rotation operation on it behind the scene. | |
2204 | */ | |
2205 | ret = consumer_clear_channel(socket, ksess->metadata->key); | |
2206 | if (ret < 0) { | |
2207 | goto error; | |
2208 | } | |
2209 | } | |
2210 | ||
2211 | goto end; | |
2212 | error: | |
2213 | switch (-ret) { | |
2214 | case LTTCOMM_CONSUMERD_RELAYD_CLEAR_DISALLOWED: | |
2215 | status = LTTNG_ERR_CLEAR_RELAY_DISALLOWED; | |
2216 | break; | |
2217 | default: | |
2218 | status = LTTNG_ERR_CLEAR_FAIL_CONSUMER; | |
2219 | break; | |
2220 | } | |
2221 | end: | |
2222 | rcu_read_unlock(); | |
2223 | return status; | |
2224 | } | |
352b58f5 JR |
2225 | |
2226 | enum lttng_error_code kernel_create_event_notifier_group_notification_fd( | |
2227 | int *event_notifier_group_notification_fd) | |
2228 | { | |
2229 | int local_fd = -1, ret; | |
2230 | enum lttng_error_code error_code_ret; | |
2231 | ||
a0377dfe | 2232 | LTTNG_ASSERT(event_notifier_group_notification_fd); |
352b58f5 JR |
2233 | |
2234 | ret = kernctl_create_event_notifier_group_notification_fd( | |
2235 | kernel_tracer_event_notifier_group_fd); | |
2236 | if (ret < 0) { | |
2237 | PERROR("Failed to create kernel event notifier group notification file descriptor"); | |
2238 | error_code_ret = LTTNG_ERR_EVENT_NOTIFIER_GROUP_NOTIFICATION_FD; | |
2239 | goto error; | |
2240 | } | |
2241 | ||
2242 | local_fd = ret; | |
2243 | ||
2244 | /* Prevent fd duplication after execlp(). */ | |
2245 | ret = fcntl(local_fd, F_SETFD, FD_CLOEXEC); | |
2246 | if (ret < 0) { | |
2247 | PERROR("Failed to set FD_CLOEXEC on kernel event notifier group notification file descriptor: fd = %d", | |
2248 | local_fd); | |
2249 | error_code_ret = LTTNG_ERR_EVENT_NOTIFIER_GROUP_NOTIFICATION_FD; | |
2250 | goto error; | |
2251 | } | |
2252 | ||
2253 | DBG("Created kernel notifier group notification file descriptor: fd = %d", | |
2254 | local_fd); | |
2255 | error_code_ret = LTTNG_OK; | |
2256 | *event_notifier_group_notification_fd = local_fd; | |
2257 | local_fd = -1; | |
2258 | ||
2259 | error: | |
2260 | if (local_fd >= 0) { | |
2261 | ret = close(local_fd); | |
2262 | if (ret) { | |
2263 | PERROR("Failed to close kernel event notifier group notification file descriptor: fd = %d", | |
2264 | local_fd); | |
2265 | } | |
2266 | } | |
2267 | ||
2268 | return error_code_ret; | |
2269 | } | |
2270 | ||
2271 | enum lttng_error_code kernel_destroy_event_notifier_group_notification_fd( | |
2272 | int event_notifier_group_notification_fd) | |
2273 | { | |
2274 | enum lttng_error_code ret_code = LTTNG_OK; | |
2275 | ||
2276 | DBG("Closing event notifier group notification file descriptor: fd = %d", | |
2277 | event_notifier_group_notification_fd); | |
2278 | if (event_notifier_group_notification_fd >= 0) { | |
2279 | const int ret = close(event_notifier_group_notification_fd); | |
2280 | if (ret) { | |
2281 | PERROR("Failed to close event notifier group notification file descriptor: fd = %d", | |
2282 | event_notifier_group_notification_fd); | |
2283 | } | |
2284 | } | |
2285 | ||
2286 | return ret_code; | |
2287 | } | |
2288 | ||
2289 | static | |
2290 | unsigned long hash_trigger(const struct lttng_trigger *trigger) | |
2291 | { | |
2292 | const struct lttng_condition *condition = | |
2293 | lttng_trigger_get_const_condition(trigger); | |
2294 | ||
2295 | return lttng_condition_hash(condition); | |
2296 | } | |
2297 | ||
2298 | static | |
2299 | int match_trigger(struct cds_lfht_node *node, const void *key) | |
2300 | { | |
2301 | const struct ltt_kernel_event_notifier_rule *event_notifier_rule; | |
7966af57 | 2302 | const struct lttng_trigger *trigger = (lttng_trigger *) key; |
352b58f5 JR |
2303 | |
2304 | event_notifier_rule = caa_container_of(node, | |
2305 | const struct ltt_kernel_event_notifier_rule, ht_node); | |
2306 | ||
2307 | return lttng_trigger_is_equal(trigger, event_notifier_rule->trigger); | |
2308 | } | |
2309 | ||
2310 | static enum lttng_error_code kernel_create_event_notifier_rule( | |
2311 | struct lttng_trigger *trigger, | |
2312 | const struct lttng_credentials *creds, uint64_t token) | |
2313 | { | |
2314 | int err, fd, ret = 0; | |
2315 | enum lttng_error_code error_code_ret; | |
2316 | enum lttng_condition_status condition_status; | |
2317 | enum lttng_condition_type condition_type; | |
2318 | enum lttng_event_rule_type event_rule_type; | |
2319 | struct ltt_kernel_event_notifier_rule *event_notifier_rule; | |
b8e2fb80 | 2320 | struct lttng_kernel_abi_event_notifier kernel_event_notifier = {}; |
bbd6675c | 2321 | unsigned int capture_bytecode_count = 0, i; |
352b58f5 JR |
2322 | const struct lttng_condition *condition = NULL; |
2323 | const struct lttng_event_rule *event_rule = NULL; | |
bbd6675c | 2324 | enum lttng_condition_status cond_status; |
352b58f5 | 2325 | |
a0377dfe | 2326 | LTTNG_ASSERT(trigger); |
352b58f5 JR |
2327 | |
2328 | condition = lttng_trigger_get_const_condition(trigger); | |
a0377dfe | 2329 | LTTNG_ASSERT(condition); |
352b58f5 JR |
2330 | |
2331 | condition_type = lttng_condition_get_type(condition); | |
a0377dfe | 2332 | LTTNG_ASSERT(condition_type == LTTNG_CONDITION_TYPE_EVENT_RULE_MATCHES); |
352b58f5 JR |
2333 | |
2334 | /* Does not acquire a reference. */ | |
8dbb86b8 | 2335 | condition_status = lttng_condition_event_rule_matches_get_rule( |
352b58f5 | 2336 | condition, &event_rule); |
a0377dfe FD |
2337 | LTTNG_ASSERT(condition_status == LTTNG_CONDITION_STATUS_OK); |
2338 | LTTNG_ASSERT(event_rule); | |
352b58f5 JR |
2339 | |
2340 | event_rule_type = lttng_event_rule_get_type(event_rule); | |
a0377dfe | 2341 | LTTNG_ASSERT(event_rule_type != LTTNG_EVENT_RULE_TYPE_UNKNOWN); |
352b58f5 JR |
2342 | |
2343 | error_code_ret = trace_kernel_create_event_notifier_rule(trigger, token, | |
8dbb86b8 JR |
2344 | lttng_condition_event_rule_matches_get_error_counter_index( |
2345 | condition), | |
352b58f5 JR |
2346 | &event_notifier_rule); |
2347 | if (error_code_ret != LTTNG_OK) { | |
2348 | goto error; | |
2349 | } | |
2350 | ||
2351 | error_code_ret = trace_kernel_init_event_notifier_from_event_rule( | |
2352 | event_rule, &kernel_event_notifier); | |
2353 | if (error_code_ret != LTTNG_OK) { | |
b5e3b044 | 2354 | goto free_event; |
352b58f5 JR |
2355 | } |
2356 | ||
2357 | kernel_event_notifier.event.token = event_notifier_rule->token; | |
90aa04a1 | 2358 | kernel_event_notifier.error_counter_idx = |
8dbb86b8 JR |
2359 | lttng_condition_event_rule_matches_get_error_counter_index( |
2360 | condition); | |
352b58f5 JR |
2361 | |
2362 | fd = kernctl_create_event_notifier( | |
2363 | kernel_tracer_event_notifier_group_fd, | |
2364 | &kernel_event_notifier); | |
2365 | if (fd < 0) { | |
2366 | switch (-fd) { | |
2367 | case EEXIST: | |
2368 | error_code_ret = LTTNG_ERR_KERN_EVENT_EXIST; | |
2369 | break; | |
2370 | case ENOSYS: | |
2371 | WARN("Failed to create kernel event notifier: not notifier type not implemented"); | |
2372 | error_code_ret = LTTNG_ERR_KERN_EVENT_ENOSYS; | |
2373 | break; | |
2374 | case ENOENT: | |
2375 | WARN("Failed to create kernel event notifier: not found: name = '%s'", | |
2376 | kernel_event_notifier.event.name); | |
2377 | error_code_ret = LTTNG_ERR_KERN_ENABLE_FAIL; | |
2378 | break; | |
2379 | default: | |
2380 | PERROR("Failed to create kernel event notifier: error code = %d, name = '%s'", | |
2381 | fd, kernel_event_notifier.event.name); | |
2382 | error_code_ret = LTTNG_ERR_KERN_ENABLE_FAIL; | |
2383 | } | |
2384 | goto free_event; | |
2385 | } | |
2386 | ||
2387 | event_notifier_rule->fd = fd; | |
2388 | /* Prevent fd duplication after execlp(). */ | |
2389 | err = fcntl(event_notifier_rule->fd, F_SETFD, FD_CLOEXEC); | |
2390 | if (err < 0) { | |
2391 | PERROR("Failed to set FD_CLOEXEC on kernel event notifier file descriptor: fd = %d", | |
2392 | fd); | |
2393 | error_code_ret = LTTNG_ERR_FATAL; | |
2394 | goto set_cloexec_error; | |
2395 | } | |
2396 | ||
2397 | if (event_notifier_rule->filter) { | |
2398 | err = kernctl_filter(event_notifier_rule->fd, event_notifier_rule->filter); | |
2399 | if (err < 0) { | |
2400 | switch (-err) { | |
2401 | case ENOMEM: | |
2402 | error_code_ret = LTTNG_ERR_FILTER_NOMEM; | |
2403 | break; | |
2404 | default: | |
2405 | error_code_ret = LTTNG_ERR_FILTER_INVAL; | |
2406 | break; | |
2407 | } | |
2408 | goto filter_error; | |
2409 | } | |
2410 | } | |
2411 | ||
2412 | if (lttng_event_rule_get_type(event_rule) == | |
46fd07ac | 2413 | LTTNG_EVENT_RULE_TYPE_KERNEL_UPROBE) { |
352b58f5 JR |
2414 | ret = userspace_probe_event_rule_add_callsites( |
2415 | event_rule, creds, event_notifier_rule->fd); | |
2416 | if (ret) { | |
2417 | error_code_ret = LTTNG_ERR_KERN_ENABLE_FAIL; | |
2418 | goto add_callsite_error; | |
2419 | } | |
2420 | } | |
2421 | ||
d602bd6a | 2422 | /* Set the capture bytecode if any. */ |
8dbb86b8 | 2423 | cond_status = lttng_condition_event_rule_matches_get_capture_descriptor_count( |
bbd6675c | 2424 | condition, &capture_bytecode_count); |
a0377dfe | 2425 | LTTNG_ASSERT(cond_status == LTTNG_CONDITION_STATUS_OK); |
bbd6675c JR |
2426 | |
2427 | for (i = 0; i < capture_bytecode_count; i++) { | |
2428 | const struct lttng_bytecode *capture_bytecode = | |
8dbb86b8 | 2429 | lttng_condition_event_rule_matches_get_capture_bytecode_at_index( |
bbd6675c JR |
2430 | condition, i); |
2431 | ||
2432 | if (capture_bytecode == NULL) { | |
2433 | ERR("Unexpected NULL capture bytecode on condition"); | |
2434 | error_code_ret = LTTNG_ERR_KERN_ENABLE_FAIL; | |
e8b1187d | 2435 | goto capture_error; |
bbd6675c JR |
2436 | } |
2437 | ||
2438 | ret = kernctl_capture(event_notifier_rule->fd, capture_bytecode); | |
2439 | if (ret < 0) { | |
2440 | ERR("Failed to set capture bytecode on event notifier rule fd: fd = %d", | |
2441 | event_notifier_rule->fd); | |
2442 | error_code_ret = LTTNG_ERR_KERN_ENABLE_FAIL; | |
e8b1187d | 2443 | goto capture_error; |
bbd6675c JR |
2444 | } |
2445 | } | |
2446 | ||
352b58f5 JR |
2447 | err = kernctl_enable(event_notifier_rule->fd); |
2448 | if (err < 0) { | |
2449 | switch (-err) { | |
2450 | case EEXIST: | |
2451 | error_code_ret = LTTNG_ERR_KERN_EVENT_EXIST; | |
2452 | break; | |
2453 | default: | |
2454 | PERROR("enable kernel event notifier"); | |
2455 | error_code_ret = LTTNG_ERR_KERN_ENABLE_FAIL; | |
2456 | break; | |
2457 | } | |
2458 | goto enable_error; | |
2459 | } | |
2460 | ||
2461 | /* Add trigger to kernel token mapping in the hash table. */ | |
2462 | rcu_read_lock(); | |
2463 | cds_lfht_add(kernel_token_to_event_notifier_rule_ht, hash_trigger(trigger), | |
2464 | &event_notifier_rule->ht_node); | |
2465 | rcu_read_unlock(); | |
2466 | ||
2467 | DBG("Created kernel event notifier: name = '%s', fd = %d", | |
2468 | kernel_event_notifier.event.name, | |
2469 | event_notifier_rule->fd); | |
2470 | ||
2471 | return LTTNG_OK; | |
2472 | ||
e8b1187d | 2473 | capture_error: |
352b58f5 JR |
2474 | add_callsite_error: |
2475 | enable_error: | |
2476 | set_cloexec_error: | |
2477 | filter_error: | |
2478 | { | |
2479 | const int close_ret = close(event_notifier_rule->fd); | |
2480 | ||
2481 | if (close_ret) { | |
2482 | PERROR("Failed to close kernel event notifier file descriptor: fd = %d", | |
2483 | event_notifier_rule->fd); | |
2484 | } | |
2485 | } | |
2486 | free_event: | |
2487 | free(event_notifier_rule); | |
2488 | error: | |
2489 | return error_code_ret; | |
2490 | } | |
2491 | ||
2492 | enum lttng_error_code kernel_register_event_notifier( | |
2493 | struct lttng_trigger *trigger, | |
2494 | const struct lttng_credentials *cmd_creds) | |
2495 | { | |
2496 | enum lttng_error_code ret; | |
2497 | enum lttng_condition_status status; | |
2498 | enum lttng_domain_type domain_type; | |
2499 | const struct lttng_event_rule *event_rule; | |
2500 | const struct lttng_condition *const condition = | |
2501 | lttng_trigger_get_const_condition(trigger); | |
2502 | const uint64_t token = lttng_trigger_get_tracer_token(trigger); | |
2503 | ||
a0377dfe | 2504 | LTTNG_ASSERT(condition); |
352b58f5 JR |
2505 | |
2506 | /* Does not acquire a reference to the event rule. */ | |
8dbb86b8 | 2507 | status = lttng_condition_event_rule_matches_get_rule( |
352b58f5 | 2508 | condition, &event_rule); |
a0377dfe | 2509 | LTTNG_ASSERT(status == LTTNG_CONDITION_STATUS_OK); |
352b58f5 JR |
2510 | |
2511 | domain_type = lttng_event_rule_get_domain_type(event_rule); | |
a0377dfe | 2512 | LTTNG_ASSERT(domain_type == LTTNG_DOMAIN_KERNEL); |
352b58f5 JR |
2513 | |
2514 | ret = kernel_create_event_notifier_rule(trigger, cmd_creds, token); | |
2515 | if (ret != LTTNG_OK) { | |
124dda43 | 2516 | ERR("Failed to create kernel event notifier rule"); |
352b58f5 JR |
2517 | } |
2518 | ||
2519 | return ret; | |
2520 | } | |
2521 | ||
2522 | enum lttng_error_code kernel_unregister_event_notifier( | |
2523 | const struct lttng_trigger *trigger) | |
2524 | { | |
2525 | struct ltt_kernel_event_notifier_rule *token_event_rule_element; | |
2526 | struct cds_lfht_node *node; | |
2527 | struct cds_lfht_iter iter; | |
2528 | enum lttng_error_code error_code_ret; | |
2529 | int ret; | |
2530 | ||
2531 | rcu_read_lock(); | |
2532 | ||
2533 | cds_lfht_lookup(kernel_token_to_event_notifier_rule_ht, | |
2534 | hash_trigger(trigger), match_trigger, trigger, &iter); | |
2535 | ||
2536 | node = cds_lfht_iter_get_node(&iter); | |
2537 | if (!node) { | |
2538 | error_code_ret = LTTNG_ERR_TRIGGER_NOT_FOUND; | |
2539 | goto error; | |
2540 | } | |
2541 | ||
2542 | token_event_rule_element = caa_container_of(node, | |
2543 | struct ltt_kernel_event_notifier_rule, ht_node); | |
2544 | ||
2545 | ret = kernel_disable_event_notifier_rule(token_event_rule_element); | |
2546 | if (ret) { | |
2547 | error_code_ret = LTTNG_ERR_FATAL; | |
2548 | goto error; | |
2549 | } | |
2550 | ||
2551 | trace_kernel_destroy_event_notifier_rule(token_event_rule_element); | |
2552 | error_code_ret = LTTNG_OK; | |
2553 | ||
2554 | error: | |
2555 | rcu_read_unlock(); | |
2556 | ||
2557 | return error_code_ret; | |
2558 | } | |
2559 | ||
2560 | int kernel_get_notification_fd(void) | |
2561 | { | |
2562 | return kernel_tracer_event_notifier_group_notification_fd; | |
2563 | } |