Commit | Line | Data |
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ab0ee2ca | 1 | /* |
ab5be9fa | 2 | * Copyright (C) 2017 Jérémie Galarneau <jeremie.galarneau@efficios.com> |
ab0ee2ca | 3 | * |
ab5be9fa | 4 | * SPDX-License-Identifier: GPL-2.0-only |
ab0ee2ca | 5 | * |
ab0ee2ca JG |
6 | */ |
7 | ||
f2b3ef9f JG |
8 | #include "lttng/action/action.h" |
9 | #include "lttng/trigger/trigger-internal.h" | |
ab0ee2ca JG |
10 | #define _LGPL_SOURCE |
11 | #include <urcu.h> | |
12 | #include <urcu/rculfhash.h> | |
13 | ||
ab0ee2ca JG |
14 | #include <common/defaults.h> |
15 | #include <common/error.h> | |
16 | #include <common/futex.h> | |
17 | #include <common/unix.h> | |
18 | #include <common/dynamic-buffer.h> | |
19 | #include <common/hashtable/utils.h> | |
20 | #include <common/sessiond-comm/sessiond-comm.h> | |
21 | #include <common/macros.h> | |
22 | #include <lttng/condition/condition.h> | |
9b63a4aa | 23 | #include <lttng/action/action-internal.h> |
ab0ee2ca JG |
24 | #include <lttng/notification/notification-internal.h> |
25 | #include <lttng/condition/condition-internal.h> | |
26 | #include <lttng/condition/buffer-usage-internal.h> | |
e8360425 | 27 | #include <lttng/condition/session-consumed-size-internal.h> |
ea9a44f0 | 28 | #include <lttng/condition/session-rotation-internal.h> |
959e3c66 | 29 | #include <lttng/condition/event-rule-internal.h> |
d02d7404 | 30 | #include <lttng/domain-internal.h> |
ab0ee2ca | 31 | #include <lttng/notification/channel-internal.h> |
85c06c44 | 32 | #include <lttng/trigger/trigger-internal.h> |
959e3c66 | 33 | #include <lttng/event-rule/event-rule-internal.h> |
1da26331 | 34 | |
ab0ee2ca JG |
35 | #include <time.h> |
36 | #include <unistd.h> | |
37 | #include <assert.h> | |
38 | #include <inttypes.h> | |
d53ea4e4 | 39 | #include <fcntl.h> |
ab0ee2ca | 40 | |
e98a976a | 41 | #include "condition-internal.h" |
1da26331 JG |
42 | #include "notification-thread.h" |
43 | #include "notification-thread-events.h" | |
44 | #include "notification-thread-commands.h" | |
45 | #include "lttng-sessiond.h" | |
46 | #include "kernel.h" | |
47 | ||
ab0ee2ca JG |
48 | #define CLIENT_POLL_MASK_IN (LPOLLIN | LPOLLERR | LPOLLHUP | LPOLLRDHUP) |
49 | #define CLIENT_POLL_MASK_IN_OUT (CLIENT_POLL_MASK_IN | LPOLLOUT) | |
50 | ||
51eab943 JG |
51 | enum lttng_object_type { |
52 | LTTNG_OBJECT_TYPE_UNKNOWN, | |
53 | LTTNG_OBJECT_TYPE_NONE, | |
54 | LTTNG_OBJECT_TYPE_CHANNEL, | |
55 | LTTNG_OBJECT_TYPE_SESSION, | |
56 | }; | |
57 | ||
ab0ee2ca | 58 | struct lttng_trigger_list_element { |
9e0bb80e | 59 | /* No ownership of the trigger object is assumed. */ |
f2b3ef9f | 60 | struct lttng_trigger *trigger; |
ab0ee2ca JG |
61 | struct cds_list_head node; |
62 | }; | |
63 | ||
64 | struct lttng_channel_trigger_list { | |
65 | struct channel_key channel_key; | |
ea9a44f0 | 66 | /* List of struct lttng_trigger_list_element. */ |
ab0ee2ca | 67 | struct cds_list_head list; |
ea9a44f0 | 68 | /* Node in the channel_triggers_ht */ |
ab0ee2ca | 69 | struct cds_lfht_node channel_triggers_ht_node; |
83b934ad MD |
70 | /* call_rcu delayed reclaim. */ |
71 | struct rcu_head rcu_node; | |
ab0ee2ca JG |
72 | }; |
73 | ||
ea9a44f0 JG |
74 | /* |
75 | * List of triggers applying to a given session. | |
76 | * | |
77 | * See: | |
78 | * - lttng_session_trigger_list_create() | |
79 | * - lttng_session_trigger_list_build() | |
80 | * - lttng_session_trigger_list_destroy() | |
81 | * - lttng_session_trigger_list_add() | |
82 | */ | |
83 | struct lttng_session_trigger_list { | |
84 | /* | |
85 | * Not owned by this; points to the session_info structure's | |
86 | * session name. | |
87 | */ | |
88 | const char *session_name; | |
89 | /* List of struct lttng_trigger_list_element. */ | |
90 | struct cds_list_head list; | |
91 | /* Node in the session_triggers_ht */ | |
92 | struct cds_lfht_node session_triggers_ht_node; | |
93 | /* | |
94 | * Weak reference to the notification system's session triggers | |
95 | * hashtable. | |
96 | * | |
97 | * The session trigger list structure structure is owned by | |
98 | * the session's session_info. | |
99 | * | |
100 | * The session_info is kept alive the the channel_infos holding a | |
101 | * reference to it (reference counting). When those channels are | |
102 | * destroyed (at runtime or on teardown), the reference they hold | |
103 | * to the session_info are released. On destruction of session_info, | |
104 | * session_info_destroy() will remove the list of triggers applying | |
105 | * to this session from the notification system's state. | |
106 | * | |
107 | * This implies that the session_triggers_ht must be destroyed | |
108 | * after the channels. | |
109 | */ | |
110 | struct cds_lfht *session_triggers_ht; | |
111 | /* Used for delayed RCU reclaim. */ | |
112 | struct rcu_head rcu_node; | |
113 | }; | |
114 | ||
ab0ee2ca JG |
115 | struct lttng_trigger_ht_element { |
116 | struct lttng_trigger *trigger; | |
117 | struct cds_lfht_node node; | |
242388e4 | 118 | struct cds_lfht_node node_by_name_uid; |
83b934ad MD |
119 | /* call_rcu delayed reclaim. */ |
120 | struct rcu_head rcu_node; | |
ab0ee2ca JG |
121 | }; |
122 | ||
123 | struct lttng_condition_list_element { | |
124 | struct lttng_condition *condition; | |
125 | struct cds_list_head node; | |
126 | }; | |
127 | ||
ab0ee2ca JG |
128 | struct channel_state_sample { |
129 | struct channel_key key; | |
130 | struct cds_lfht_node channel_state_ht_node; | |
131 | uint64_t highest_usage; | |
132 | uint64_t lowest_usage; | |
e8360425 | 133 | uint64_t channel_total_consumed; |
83b934ad MD |
134 | /* call_rcu delayed reclaim. */ |
135 | struct rcu_head rcu_node; | |
ab0ee2ca JG |
136 | }; |
137 | ||
e4db5ace | 138 | static unsigned long hash_channel_key(struct channel_key *key); |
ed327204 | 139 | static int evaluate_buffer_condition(const struct lttng_condition *condition, |
e4db5ace | 140 | struct lttng_evaluation **evaluation, |
e8360425 JD |
141 | const struct notification_thread_state *state, |
142 | const struct channel_state_sample *previous_sample, | |
143 | const struct channel_state_sample *latest_sample, | |
144 | uint64_t previous_session_consumed_total, | |
145 | uint64_t latest_session_consumed_total, | |
146 | struct channel_info *channel_info); | |
e4db5ace | 147 | static |
9b63a4aa JG |
148 | int send_evaluation_to_clients(const struct lttng_trigger *trigger, |
149 | const struct lttng_evaluation *evaluation, | |
e4db5ace JR |
150 | struct notification_client_list *client_list, |
151 | struct notification_thread_state *state, | |
152 | uid_t channel_uid, gid_t channel_gid); | |
153 | ||
8abe313a | 154 | |
ea9a44f0 | 155 | /* session_info API */ |
8abe313a JG |
156 | static |
157 | void session_info_destroy(void *_data); | |
158 | static | |
159 | void session_info_get(struct session_info *session_info); | |
160 | static | |
161 | void session_info_put(struct session_info *session_info); | |
162 | static | |
163 | struct session_info *session_info_create(const char *name, | |
ea9a44f0 | 164 | uid_t uid, gid_t gid, |
1eee26c5 JG |
165 | struct lttng_session_trigger_list *trigger_list, |
166 | struct cds_lfht *sessions_ht); | |
8abe313a JG |
167 | static |
168 | void session_info_add_channel(struct session_info *session_info, | |
169 | struct channel_info *channel_info); | |
170 | static | |
171 | void session_info_remove_channel(struct session_info *session_info, | |
172 | struct channel_info *channel_info); | |
173 | ||
ea9a44f0 JG |
174 | /* lttng_session_trigger_list API */ |
175 | static | |
176 | struct lttng_session_trigger_list *lttng_session_trigger_list_create( | |
177 | const char *session_name, | |
178 | struct cds_lfht *session_triggers_ht); | |
179 | static | |
180 | struct lttng_session_trigger_list *lttng_session_trigger_list_build( | |
181 | const struct notification_thread_state *state, | |
182 | const char *session_name); | |
183 | static | |
184 | void lttng_session_trigger_list_destroy( | |
185 | struct lttng_session_trigger_list *list); | |
186 | static | |
187 | int lttng_session_trigger_list_add(struct lttng_session_trigger_list *list, | |
f2b3ef9f | 188 | struct lttng_trigger *trigger); |
ea9a44f0 | 189 | |
f2b3ef9f JG |
190 | static |
191 | int client_handle_transmission_status( | |
192 | struct notification_client *client, | |
193 | enum client_transmission_status transmission_status, | |
194 | struct notification_thread_state *state); | |
ea9a44f0 | 195 | |
242388e4 JR |
196 | static |
197 | void free_lttng_trigger_ht_element_rcu(struct rcu_head *node); | |
198 | ||
ab0ee2ca | 199 | static |
ac1889bf | 200 | int match_client_socket(struct cds_lfht_node *node, const void *key) |
ab0ee2ca JG |
201 | { |
202 | /* This double-cast is intended to supress pointer-to-cast warning. */ | |
ac1889bf JG |
203 | const int socket = (int) (intptr_t) key; |
204 | const struct notification_client *client = caa_container_of(node, | |
205 | struct notification_client, client_socket_ht_node); | |
ab0ee2ca | 206 | |
ac1889bf JG |
207 | return client->socket == socket; |
208 | } | |
209 | ||
210 | static | |
211 | int match_client_id(struct cds_lfht_node *node, const void *key) | |
212 | { | |
213 | /* This double-cast is intended to supress pointer-to-cast warning. */ | |
214 | const notification_client_id id = *((notification_client_id *) key); | |
215 | const struct notification_client *client = caa_container_of( | |
216 | node, struct notification_client, client_id_ht_node); | |
ab0ee2ca | 217 | |
ac1889bf | 218 | return client->id == id; |
ab0ee2ca JG |
219 | } |
220 | ||
221 | static | |
222 | int match_channel_trigger_list(struct cds_lfht_node *node, const void *key) | |
223 | { | |
224 | struct channel_key *channel_key = (struct channel_key *) key; | |
225 | struct lttng_channel_trigger_list *trigger_list; | |
226 | ||
227 | trigger_list = caa_container_of(node, struct lttng_channel_trigger_list, | |
228 | channel_triggers_ht_node); | |
229 | ||
230 | return !!((channel_key->key == trigger_list->channel_key.key) && | |
231 | (channel_key->domain == trigger_list->channel_key.domain)); | |
232 | } | |
233 | ||
51eab943 JG |
234 | static |
235 | int match_session_trigger_list(struct cds_lfht_node *node, const void *key) | |
236 | { | |
237 | const char *session_name = (const char *) key; | |
238 | struct lttng_session_trigger_list *trigger_list; | |
239 | ||
240 | trigger_list = caa_container_of(node, struct lttng_session_trigger_list, | |
241 | session_triggers_ht_node); | |
242 | ||
243 | return !!(strcmp(trigger_list->session_name, session_name) == 0); | |
244 | } | |
245 | ||
ab0ee2ca JG |
246 | static |
247 | int match_channel_state_sample(struct cds_lfht_node *node, const void *key) | |
248 | { | |
249 | struct channel_key *channel_key = (struct channel_key *) key; | |
250 | struct channel_state_sample *sample; | |
251 | ||
252 | sample = caa_container_of(node, struct channel_state_sample, | |
253 | channel_state_ht_node); | |
254 | ||
255 | return !!((channel_key->key == sample->key.key) && | |
256 | (channel_key->domain == sample->key.domain)); | |
257 | } | |
258 | ||
259 | static | |
260 | int match_channel_info(struct cds_lfht_node *node, const void *key) | |
261 | { | |
262 | struct channel_key *channel_key = (struct channel_key *) key; | |
263 | struct channel_info *channel_info; | |
264 | ||
265 | channel_info = caa_container_of(node, struct channel_info, | |
266 | channels_ht_node); | |
267 | ||
268 | return !!((channel_key->key == channel_info->key.key) && | |
269 | (channel_key->domain == channel_info->key.domain)); | |
270 | } | |
271 | ||
272 | static | |
242388e4 | 273 | int match_trigger(struct cds_lfht_node *node, const void *key) |
ab0ee2ca | 274 | { |
242388e4 JR |
275 | struct lttng_trigger *trigger_key = (struct lttng_trigger *) key; |
276 | struct lttng_trigger_ht_element *trigger_ht_element; | |
ab0ee2ca | 277 | |
242388e4 | 278 | trigger_ht_element = caa_container_of(node, struct lttng_trigger_ht_element, |
ab0ee2ca | 279 | node); |
ab0ee2ca | 280 | |
242388e4 | 281 | return !!lttng_trigger_is_equal(trigger_key, trigger_ht_element->trigger); |
ab0ee2ca JG |
282 | } |
283 | ||
ab0ee2ca JG |
284 | static |
285 | int match_client_list_condition(struct cds_lfht_node *node, const void *key) | |
286 | { | |
287 | struct lttng_condition *condition_key = (struct lttng_condition *) key; | |
288 | struct notification_client_list *client_list; | |
f82f93a1 | 289 | const struct lttng_condition *condition; |
ab0ee2ca JG |
290 | |
291 | assert(condition_key); | |
292 | ||
293 | client_list = caa_container_of(node, struct notification_client_list, | |
505b2d90 | 294 | notification_trigger_clients_ht_node); |
f82f93a1 | 295 | condition = lttng_trigger_get_const_condition(client_list->trigger); |
ab0ee2ca JG |
296 | |
297 | return !!lttng_condition_is_equal(condition_key, condition); | |
298 | } | |
299 | ||
f82f93a1 JG |
300 | static |
301 | int match_session(struct cds_lfht_node *node, const void *key) | |
302 | { | |
303 | const char *name = key; | |
304 | struct session_info *session_info = caa_container_of( | |
305 | node, struct session_info, sessions_ht_node); | |
306 | ||
307 | return !strcmp(session_info->name, name); | |
308 | } | |
309 | ||
242388e4 JR |
310 | /* |
311 | * Match trigger based on name and credentials only. | |
312 | * Name duplication is NOT allowed for the same uid. | |
313 | */ | |
314 | static | |
315 | int match_trigger_by_name_uid(struct cds_lfht_node *node, | |
316 | const void *key) | |
317 | { | |
318 | bool match = false; | |
319 | const char *name; | |
320 | const char *key_name; | |
321 | enum lttng_trigger_status status; | |
322 | const struct lttng_credentials *key_creds; | |
323 | const struct lttng_credentials *node_creds; | |
324 | const struct lttng_trigger *trigger_key = | |
325 | (const struct lttng_trigger *) key; | |
326 | const struct lttng_trigger_ht_element *trigger_ht_element = | |
327 | caa_container_of(node, | |
328 | struct lttng_trigger_ht_element, | |
329 | node_by_name_uid); | |
330 | ||
331 | status = lttng_trigger_get_name(trigger_ht_element->trigger, &name); | |
332 | assert(status == LTTNG_TRIGGER_STATUS_OK); | |
333 | ||
334 | status = lttng_trigger_get_name(trigger_key, &key_name); | |
335 | assert(status == LTTNG_TRIGGER_STATUS_OK); | |
336 | ||
337 | /* Compare the names. */ | |
338 | if (strcmp(name, key_name) != 0) { | |
339 | goto end; | |
340 | } | |
341 | ||
342 | /* Compare the owners' UIDs. */ | |
343 | key_creds = lttng_trigger_get_credentials(trigger_key); | |
344 | node_creds = lttng_trigger_get_credentials(trigger_ht_element->trigger); | |
345 | ||
346 | match = lttng_credentials_is_equal_uid(key_creds, node_creds); | |
347 | ||
348 | end: | |
349 | return match; | |
350 | } | |
351 | ||
352 | /* | |
353 | * Hash trigger based on name and credentials only. | |
354 | */ | |
355 | static | |
356 | unsigned long hash_trigger_by_name_uid(const struct lttng_trigger *trigger) | |
357 | { | |
358 | unsigned long hash = 0; | |
359 | const struct lttng_credentials *trigger_creds; | |
360 | const char *trigger_name; | |
361 | enum lttng_trigger_status status; | |
362 | ||
363 | status = lttng_trigger_get_name(trigger, &trigger_name); | |
364 | if (status == LTTNG_TRIGGER_STATUS_OK) { | |
365 | hash = hash_key_str(trigger_name, lttng_ht_seed); | |
366 | } | |
367 | ||
368 | trigger_creds = lttng_trigger_get_credentials(trigger); | |
369 | hash ^= hash_key_ulong((void *) (unsigned long) LTTNG_OPTIONAL_GET(trigger_creds->uid), | |
370 | lttng_ht_seed); | |
371 | ||
372 | return hash; | |
373 | } | |
374 | ||
e4db5ace JR |
375 | static |
376 | unsigned long hash_channel_key(struct channel_key *key) | |
377 | { | |
378 | unsigned long key_hash = hash_key_u64(&key->key, lttng_ht_seed); | |
379 | unsigned long domain_hash = hash_key_ulong( | |
380 | (void *) (unsigned long) key->domain, lttng_ht_seed); | |
381 | ||
382 | return key_hash ^ domain_hash; | |
383 | } | |
384 | ||
ac1889bf JG |
385 | static |
386 | unsigned long hash_client_socket(int socket) | |
387 | { | |
388 | return hash_key_ulong((void *) (unsigned long) socket, lttng_ht_seed); | |
389 | } | |
390 | ||
391 | static | |
392 | unsigned long hash_client_id(notification_client_id id) | |
393 | { | |
394 | return hash_key_u64(&id, lttng_ht_seed); | |
395 | } | |
396 | ||
f82f93a1 JG |
397 | /* |
398 | * Get the type of object to which a given condition applies. Bindings let | |
399 | * the notification system evaluate a trigger's condition when a given | |
400 | * object's state is updated. | |
401 | * | |
402 | * For instance, a condition bound to a channel will be evaluated everytime | |
403 | * the channel's state is changed by a channel monitoring sample. | |
404 | */ | |
405 | static | |
406 | enum lttng_object_type get_condition_binding_object( | |
407 | const struct lttng_condition *condition) | |
408 | { | |
409 | switch (lttng_condition_get_type(condition)) { | |
410 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
411 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
412 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
e742b055 | 413 | return LTTNG_OBJECT_TYPE_CHANNEL; |
f82f93a1 JG |
414 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: |
415 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
416 | return LTTNG_OBJECT_TYPE_SESSION; | |
959e3c66 JR |
417 | case LTTNG_CONDITION_TYPE_EVENT_RULE_HIT: |
418 | return LTTNG_OBJECT_TYPE_NONE; | |
f82f93a1 JG |
419 | default: |
420 | return LTTNG_OBJECT_TYPE_UNKNOWN; | |
421 | } | |
422 | } | |
423 | ||
83b934ad MD |
424 | static |
425 | void free_channel_info_rcu(struct rcu_head *node) | |
426 | { | |
427 | free(caa_container_of(node, struct channel_info, rcu_node)); | |
428 | } | |
429 | ||
ab0ee2ca JG |
430 | static |
431 | void channel_info_destroy(struct channel_info *channel_info) | |
432 | { | |
433 | if (!channel_info) { | |
434 | return; | |
435 | } | |
436 | ||
8abe313a JG |
437 | if (channel_info->session_info) { |
438 | session_info_remove_channel(channel_info->session_info, | |
439 | channel_info); | |
440 | session_info_put(channel_info->session_info); | |
ab0ee2ca | 441 | } |
8abe313a JG |
442 | if (channel_info->name) { |
443 | free(channel_info->name); | |
ab0ee2ca | 444 | } |
83b934ad MD |
445 | call_rcu(&channel_info->rcu_node, free_channel_info_rcu); |
446 | } | |
447 | ||
448 | static | |
449 | void free_session_info_rcu(struct rcu_head *node) | |
450 | { | |
451 | free(caa_container_of(node, struct session_info, rcu_node)); | |
ab0ee2ca JG |
452 | } |
453 | ||
8abe313a | 454 | /* Don't call directly, use the ref-counting mechanism. */ |
ab0ee2ca | 455 | static |
8abe313a | 456 | void session_info_destroy(void *_data) |
ab0ee2ca | 457 | { |
8abe313a | 458 | struct session_info *session_info = _data; |
3b68d0a3 | 459 | int ret; |
ab0ee2ca | 460 | |
8abe313a JG |
461 | assert(session_info); |
462 | if (session_info->channel_infos_ht) { | |
3b68d0a3 JR |
463 | ret = cds_lfht_destroy(session_info->channel_infos_ht, NULL); |
464 | if (ret) { | |
4c3f302b | 465 | ERR("[notification-thread] Failed to destroy channel information hash table"); |
3b68d0a3 | 466 | } |
8abe313a | 467 | } |
ea9a44f0 | 468 | lttng_session_trigger_list_destroy(session_info->trigger_list); |
1eee26c5 JG |
469 | |
470 | rcu_read_lock(); | |
471 | cds_lfht_del(session_info->sessions_ht, | |
472 | &session_info->sessions_ht_node); | |
473 | rcu_read_unlock(); | |
8abe313a | 474 | free(session_info->name); |
83b934ad | 475 | call_rcu(&session_info->rcu_node, free_session_info_rcu); |
8abe313a | 476 | } |
ab0ee2ca | 477 | |
8abe313a JG |
478 | static |
479 | void session_info_get(struct session_info *session_info) | |
480 | { | |
481 | if (!session_info) { | |
482 | return; | |
483 | } | |
484 | lttng_ref_get(&session_info->ref); | |
485 | } | |
486 | ||
487 | static | |
488 | void session_info_put(struct session_info *session_info) | |
489 | { | |
490 | if (!session_info) { | |
491 | return; | |
ab0ee2ca | 492 | } |
8abe313a JG |
493 | lttng_ref_put(&session_info->ref); |
494 | } | |
495 | ||
496 | static | |
ea9a44f0 | 497 | struct session_info *session_info_create(const char *name, uid_t uid, gid_t gid, |
1eee26c5 JG |
498 | struct lttng_session_trigger_list *trigger_list, |
499 | struct cds_lfht *sessions_ht) | |
8abe313a JG |
500 | { |
501 | struct session_info *session_info; | |
ab0ee2ca | 502 | |
8abe313a | 503 | assert(name); |
ab0ee2ca | 504 | |
8abe313a JG |
505 | session_info = zmalloc(sizeof(*session_info)); |
506 | if (!session_info) { | |
507 | goto end; | |
508 | } | |
509 | lttng_ref_init(&session_info->ref, session_info_destroy); | |
510 | ||
511 | session_info->channel_infos_ht = cds_lfht_new(DEFAULT_HT_SIZE, | |
512 | 1, 0, CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL); | |
513 | if (!session_info->channel_infos_ht) { | |
ab0ee2ca JG |
514 | goto error; |
515 | } | |
8abe313a JG |
516 | |
517 | cds_lfht_node_init(&session_info->sessions_ht_node); | |
518 | session_info->name = strdup(name); | |
519 | if (!session_info->name) { | |
ab0ee2ca JG |
520 | goto error; |
521 | } | |
8abe313a JG |
522 | session_info->uid = uid; |
523 | session_info->gid = gid; | |
ea9a44f0 | 524 | session_info->trigger_list = trigger_list; |
1eee26c5 | 525 | session_info->sessions_ht = sessions_ht; |
8abe313a JG |
526 | end: |
527 | return session_info; | |
528 | error: | |
529 | session_info_put(session_info); | |
530 | return NULL; | |
531 | } | |
532 | ||
533 | static | |
534 | void session_info_add_channel(struct session_info *session_info, | |
535 | struct channel_info *channel_info) | |
536 | { | |
537 | rcu_read_lock(); | |
538 | cds_lfht_add(session_info->channel_infos_ht, | |
539 | hash_channel_key(&channel_info->key), | |
540 | &channel_info->session_info_channels_ht_node); | |
541 | rcu_read_unlock(); | |
542 | } | |
543 | ||
544 | static | |
545 | void session_info_remove_channel(struct session_info *session_info, | |
546 | struct channel_info *channel_info) | |
547 | { | |
548 | rcu_read_lock(); | |
549 | cds_lfht_del(session_info->channel_infos_ht, | |
550 | &channel_info->session_info_channels_ht_node); | |
551 | rcu_read_unlock(); | |
552 | } | |
553 | ||
554 | static | |
555 | struct channel_info *channel_info_create(const char *channel_name, | |
556 | struct channel_key *channel_key, uint64_t channel_capacity, | |
557 | struct session_info *session_info) | |
558 | { | |
559 | struct channel_info *channel_info = zmalloc(sizeof(*channel_info)); | |
560 | ||
561 | if (!channel_info) { | |
562 | goto end; | |
563 | } | |
564 | ||
ab0ee2ca | 565 | cds_lfht_node_init(&channel_info->channels_ht_node); |
8abe313a JG |
566 | cds_lfht_node_init(&channel_info->session_info_channels_ht_node); |
567 | memcpy(&channel_info->key, channel_key, sizeof(*channel_key)); | |
568 | channel_info->capacity = channel_capacity; | |
569 | ||
570 | channel_info->name = strdup(channel_name); | |
571 | if (!channel_info->name) { | |
572 | goto error; | |
573 | } | |
574 | ||
575 | /* | |
576 | * Set the references between session and channel infos: | |
577 | * - channel_info holds a strong reference to session_info | |
578 | * - session_info holds a weak reference to channel_info | |
579 | */ | |
580 | session_info_get(session_info); | |
581 | session_info_add_channel(session_info, channel_info); | |
582 | channel_info->session_info = session_info; | |
ab0ee2ca | 583 | end: |
8abe313a | 584 | return channel_info; |
ab0ee2ca | 585 | error: |
8abe313a | 586 | channel_info_destroy(channel_info); |
ab0ee2ca JG |
587 | return NULL; |
588 | } | |
589 | ||
f2b3ef9f | 590 | LTTNG_HIDDEN |
505b2d90 JG |
591 | bool notification_client_list_get(struct notification_client_list *list) |
592 | { | |
593 | return urcu_ref_get_unless_zero(&list->ref); | |
594 | } | |
595 | ||
596 | static | |
597 | void free_notification_client_list_rcu(struct rcu_head *node) | |
598 | { | |
599 | free(caa_container_of(node, struct notification_client_list, | |
600 | rcu_node)); | |
601 | } | |
602 | ||
603 | static | |
604 | void notification_client_list_release(struct urcu_ref *list_ref) | |
605 | { | |
606 | struct notification_client_list *list = | |
607 | container_of(list_ref, typeof(*list), ref); | |
608 | struct notification_client_list_element *client_list_element, *tmp; | |
609 | ||
610 | if (list->notification_trigger_clients_ht) { | |
611 | rcu_read_lock(); | |
612 | cds_lfht_del(list->notification_trigger_clients_ht, | |
613 | &list->notification_trigger_clients_ht_node); | |
614 | rcu_read_unlock(); | |
615 | list->notification_trigger_clients_ht = NULL; | |
616 | } | |
617 | cds_list_for_each_entry_safe(client_list_element, tmp, | |
618 | &list->list, node) { | |
619 | free(client_list_element); | |
620 | } | |
621 | pthread_mutex_destroy(&list->lock); | |
622 | call_rcu(&list->rcu_node, free_notification_client_list_rcu); | |
623 | } | |
624 | ||
625 | static | |
626 | struct notification_client_list *notification_client_list_create( | |
627 | const struct lttng_trigger *trigger) | |
628 | { | |
629 | struct notification_client_list *client_list = | |
630 | zmalloc(sizeof(*client_list)); | |
631 | ||
632 | if (!client_list) { | |
633 | goto error; | |
634 | } | |
635 | pthread_mutex_init(&client_list->lock, NULL); | |
636 | urcu_ref_init(&client_list->ref); | |
637 | cds_lfht_node_init(&client_list->notification_trigger_clients_ht_node); | |
638 | CDS_INIT_LIST_HEAD(&client_list->list); | |
639 | client_list->trigger = trigger; | |
640 | error: | |
641 | return client_list; | |
642 | } | |
643 | ||
644 | static | |
645 | void publish_notification_client_list( | |
646 | struct notification_thread_state *state, | |
647 | struct notification_client_list *list) | |
648 | { | |
649 | const struct lttng_condition *condition = | |
650 | lttng_trigger_get_const_condition(list->trigger); | |
651 | ||
652 | assert(!list->notification_trigger_clients_ht); | |
f2b3ef9f | 653 | notification_client_list_get(list); |
505b2d90 JG |
654 | |
655 | list->notification_trigger_clients_ht = | |
656 | state->notification_trigger_clients_ht; | |
657 | ||
658 | rcu_read_lock(); | |
659 | cds_lfht_add(state->notification_trigger_clients_ht, | |
660 | lttng_condition_hash(condition), | |
661 | &list->notification_trigger_clients_ht_node); | |
662 | rcu_read_unlock(); | |
663 | } | |
664 | ||
f2b3ef9f | 665 | LTTNG_HIDDEN |
505b2d90 JG |
666 | void notification_client_list_put(struct notification_client_list *list) |
667 | { | |
668 | if (!list) { | |
669 | return; | |
670 | } | |
671 | return urcu_ref_put(&list->ref, notification_client_list_release); | |
672 | } | |
673 | ||
674 | /* Provides a reference to the returned list. */ | |
ed327204 JG |
675 | static |
676 | struct notification_client_list *get_client_list_from_condition( | |
677 | struct notification_thread_state *state, | |
678 | const struct lttng_condition *condition) | |
679 | { | |
680 | struct cds_lfht_node *node; | |
681 | struct cds_lfht_iter iter; | |
505b2d90 | 682 | struct notification_client_list *list = NULL; |
ed327204 | 683 | |
505b2d90 | 684 | rcu_read_lock(); |
ed327204 JG |
685 | cds_lfht_lookup(state->notification_trigger_clients_ht, |
686 | lttng_condition_hash(condition), | |
687 | match_client_list_condition, | |
688 | condition, | |
689 | &iter); | |
690 | node = cds_lfht_iter_get_node(&iter); | |
505b2d90 JG |
691 | if (node) { |
692 | list = container_of(node, struct notification_client_list, | |
693 | notification_trigger_clients_ht_node); | |
694 | list = notification_client_list_get(list) ? list : NULL; | |
695 | } | |
ed327204 | 696 | |
505b2d90 JG |
697 | rcu_read_unlock(); |
698 | return list; | |
ed327204 JG |
699 | } |
700 | ||
e4db5ace | 701 | static |
f82f93a1 JG |
702 | int evaluate_channel_condition_for_client( |
703 | const struct lttng_condition *condition, | |
704 | struct notification_thread_state *state, | |
705 | struct lttng_evaluation **evaluation, | |
706 | uid_t *session_uid, gid_t *session_gid) | |
e4db5ace JR |
707 | { |
708 | int ret; | |
709 | struct cds_lfht_iter iter; | |
710 | struct cds_lfht_node *node; | |
711 | struct channel_info *channel_info = NULL; | |
712 | struct channel_key *channel_key = NULL; | |
713 | struct channel_state_sample *last_sample = NULL; | |
714 | struct lttng_channel_trigger_list *channel_trigger_list = NULL; | |
e4db5ace | 715 | |
505b2d90 JG |
716 | rcu_read_lock(); |
717 | ||
f82f93a1 | 718 | /* Find the channel associated with the condition. */ |
e4db5ace | 719 | cds_lfht_for_each_entry(state->channel_triggers_ht, &iter, |
f82f93a1 | 720 | channel_trigger_list, channel_triggers_ht_node) { |
e4db5ace JR |
721 | struct lttng_trigger_list_element *element; |
722 | ||
723 | cds_list_for_each_entry(element, &channel_trigger_list->list, node) { | |
9b63a4aa | 724 | const struct lttng_condition *current_condition = |
f82f93a1 | 725 | lttng_trigger_get_const_condition( |
e4db5ace JR |
726 | element->trigger); |
727 | ||
728 | assert(current_condition); | |
729 | if (!lttng_condition_is_equal(condition, | |
2ae99f0b | 730 | current_condition)) { |
e4db5ace JR |
731 | continue; |
732 | } | |
733 | ||
734 | /* Found the trigger, save the channel key. */ | |
735 | channel_key = &channel_trigger_list->channel_key; | |
736 | break; | |
737 | } | |
738 | if (channel_key) { | |
739 | /* The channel key was found stop iteration. */ | |
740 | break; | |
741 | } | |
742 | } | |
743 | ||
744 | if (!channel_key){ | |
745 | /* No channel found; normal exit. */ | |
f82f93a1 | 746 | DBG("[notification-thread] No known channel associated with newly subscribed-to condition"); |
e4db5ace JR |
747 | ret = 0; |
748 | goto end; | |
749 | } | |
750 | ||
751 | /* Fetch channel info for the matching channel. */ | |
752 | cds_lfht_lookup(state->channels_ht, | |
753 | hash_channel_key(channel_key), | |
754 | match_channel_info, | |
755 | channel_key, | |
756 | &iter); | |
757 | node = cds_lfht_iter_get_node(&iter); | |
758 | assert(node); | |
759 | channel_info = caa_container_of(node, struct channel_info, | |
760 | channels_ht_node); | |
761 | ||
762 | /* Retrieve the channel's last sample, if it exists. */ | |
763 | cds_lfht_lookup(state->channel_state_ht, | |
764 | hash_channel_key(channel_key), | |
765 | match_channel_state_sample, | |
766 | channel_key, | |
767 | &iter); | |
768 | node = cds_lfht_iter_get_node(&iter); | |
769 | if (node) { | |
770 | last_sample = caa_container_of(node, | |
771 | struct channel_state_sample, | |
772 | channel_state_ht_node); | |
773 | } else { | |
774 | /* Nothing to evaluate, no sample was ever taken. Normal exit */ | |
775 | DBG("[notification-thread] No channel sample associated with newly subscribed-to condition"); | |
776 | ret = 0; | |
777 | goto end; | |
778 | } | |
779 | ||
f82f93a1 | 780 | ret = evaluate_buffer_condition(condition, evaluation, state, |
e8360425 JD |
781 | NULL, last_sample, |
782 | 0, channel_info->session_info->consumed_data_size, | |
783 | channel_info); | |
e4db5ace | 784 | if (ret) { |
066a3c82 | 785 | WARN("[notification-thread] Fatal error occurred while evaluating a newly subscribed-to condition"); |
e4db5ace JR |
786 | goto end; |
787 | } | |
788 | ||
f82f93a1 JG |
789 | *session_uid = channel_info->session_info->uid; |
790 | *session_gid = channel_info->session_info->gid; | |
791 | end: | |
505b2d90 | 792 | rcu_read_unlock(); |
f82f93a1 JG |
793 | return ret; |
794 | } | |
795 | ||
796 | static | |
797 | const char *get_condition_session_name(const struct lttng_condition *condition) | |
798 | { | |
799 | const char *session_name = NULL; | |
800 | enum lttng_condition_status status; | |
801 | ||
802 | switch (lttng_condition_get_type(condition)) { | |
803 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
804 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
805 | status = lttng_condition_buffer_usage_get_session_name( | |
806 | condition, &session_name); | |
807 | break; | |
808 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
809 | status = lttng_condition_session_consumed_size_get_session_name( | |
810 | condition, &session_name); | |
811 | break; | |
812 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
813 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
814 | status = lttng_condition_session_rotation_get_session_name( | |
815 | condition, &session_name); | |
816 | break; | |
817 | default: | |
818 | abort(); | |
819 | } | |
820 | if (status != LTTNG_CONDITION_STATUS_OK) { | |
821 | ERR("[notification-thread] Failed to retrieve session rotation condition's session name"); | |
822 | goto end; | |
823 | } | |
824 | end: | |
825 | return session_name; | |
826 | } | |
827 | ||
f82f93a1 JG |
828 | static |
829 | int evaluate_session_condition_for_client( | |
830 | const struct lttng_condition *condition, | |
831 | struct notification_thread_state *state, | |
832 | struct lttng_evaluation **evaluation, | |
833 | uid_t *session_uid, gid_t *session_gid) | |
834 | { | |
835 | int ret; | |
836 | struct cds_lfht_iter iter; | |
837 | struct cds_lfht_node *node; | |
838 | const char *session_name; | |
839 | struct session_info *session_info = NULL; | |
840 | ||
505b2d90 | 841 | rcu_read_lock(); |
f82f93a1 JG |
842 | session_name = get_condition_session_name(condition); |
843 | ||
844 | /* Find the session associated with the trigger. */ | |
845 | cds_lfht_lookup(state->sessions_ht, | |
846 | hash_key_str(session_name, lttng_ht_seed), | |
847 | match_session, | |
848 | session_name, | |
849 | &iter); | |
850 | node = cds_lfht_iter_get_node(&iter); | |
851 | if (!node) { | |
852 | DBG("[notification-thread] No known session matching name \"%s\"", | |
853 | session_name); | |
854 | ret = 0; | |
855 | goto end; | |
856 | } | |
857 | ||
858 | session_info = caa_container_of(node, struct session_info, | |
859 | sessions_ht_node); | |
860 | session_info_get(session_info); | |
861 | ||
862 | /* | |
863 | * Evaluation is performed in-line here since only one type of | |
864 | * session-bound condition is handled for the moment. | |
865 | */ | |
866 | switch (lttng_condition_get_type(condition)) { | |
867 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
868 | if (!session_info->rotation.ongoing) { | |
be558f88 | 869 | ret = 0; |
f82f93a1 JG |
870 | goto end_session_put; |
871 | } | |
872 | ||
873 | *evaluation = lttng_evaluation_session_rotation_ongoing_create( | |
874 | session_info->rotation.id); | |
875 | if (!*evaluation) { | |
876 | /* Fatal error. */ | |
877 | ERR("[notification-thread] Failed to create session rotation ongoing evaluation for session \"%s\"", | |
878 | session_info->name); | |
879 | ret = -1; | |
880 | goto end_session_put; | |
881 | } | |
882 | ret = 0; | |
883 | break; | |
884 | default: | |
885 | ret = 0; | |
886 | goto end_session_put; | |
887 | } | |
888 | ||
889 | *session_uid = session_info->uid; | |
890 | *session_gid = session_info->gid; | |
891 | ||
892 | end_session_put: | |
893 | session_info_put(session_info); | |
894 | end: | |
505b2d90 | 895 | rcu_read_unlock(); |
f82f93a1 JG |
896 | return ret; |
897 | } | |
898 | ||
f82f93a1 JG |
899 | static |
900 | int evaluate_condition_for_client(const struct lttng_trigger *trigger, | |
901 | const struct lttng_condition *condition, | |
902 | struct notification_client *client, | |
903 | struct notification_thread_state *state) | |
904 | { | |
905 | int ret; | |
906 | struct lttng_evaluation *evaluation = NULL; | |
505b2d90 JG |
907 | struct notification_client_list client_list = { |
908 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
909 | }; | |
f82f93a1 JG |
910 | struct notification_client_list_element client_list_element = { 0 }; |
911 | uid_t object_uid = 0; | |
912 | gid_t object_gid = 0; | |
913 | ||
914 | assert(trigger); | |
915 | assert(condition); | |
916 | assert(client); | |
917 | assert(state); | |
918 | ||
919 | switch (get_condition_binding_object(condition)) { | |
920 | case LTTNG_OBJECT_TYPE_SESSION: | |
921 | ret = evaluate_session_condition_for_client(condition, state, | |
922 | &evaluation, &object_uid, &object_gid); | |
923 | break; | |
924 | case LTTNG_OBJECT_TYPE_CHANNEL: | |
925 | ret = evaluate_channel_condition_for_client(condition, state, | |
926 | &evaluation, &object_uid, &object_gid); | |
927 | break; | |
928 | case LTTNG_OBJECT_TYPE_NONE: | |
7e802d0a | 929 | DBG("[notification-thread] Newly subscribed-to condition not bound to object, nothing to evaluate"); |
f82f93a1 JG |
930 | ret = 0; |
931 | goto end; | |
932 | case LTTNG_OBJECT_TYPE_UNKNOWN: | |
933 | default: | |
934 | ret = -1; | |
935 | goto end; | |
936 | } | |
af0c318d JG |
937 | if (ret) { |
938 | /* Fatal error. */ | |
939 | goto end; | |
940 | } | |
e4db5ace JR |
941 | if (!evaluation) { |
942 | /* Evaluation yielded nothing. Normal exit. */ | |
943 | DBG("[notification-thread] Newly subscribed-to condition evaluated to false, nothing to report to client"); | |
944 | ret = 0; | |
945 | goto end; | |
946 | } | |
947 | ||
948 | /* | |
949 | * Create a temporary client list with the client currently | |
950 | * subscribing. | |
951 | */ | |
505b2d90 | 952 | cds_lfht_node_init(&client_list.notification_trigger_clients_ht_node); |
e4db5ace JR |
953 | CDS_INIT_LIST_HEAD(&client_list.list); |
954 | client_list.trigger = trigger; | |
955 | ||
956 | CDS_INIT_LIST_HEAD(&client_list_element.node); | |
957 | client_list_element.client = client; | |
958 | cds_list_add(&client_list_element.node, &client_list.list); | |
959 | ||
960 | /* Send evaluation result to the newly-subscribed client. */ | |
961 | DBG("[notification-thread] Newly subscribed-to condition evaluated to true, notifying client"); | |
962 | ret = send_evaluation_to_clients(trigger, evaluation, &client_list, | |
f82f93a1 | 963 | state, object_uid, object_gid); |
e4db5ace JR |
964 | |
965 | end: | |
966 | return ret; | |
967 | } | |
968 | ||
ab0ee2ca JG |
969 | static |
970 | int notification_thread_client_subscribe(struct notification_client *client, | |
971 | struct lttng_condition *condition, | |
972 | struct notification_thread_state *state, | |
973 | enum lttng_notification_channel_status *_status) | |
974 | { | |
975 | int ret = 0; | |
505b2d90 | 976 | struct notification_client_list *client_list = NULL; |
ab0ee2ca JG |
977 | struct lttng_condition_list_element *condition_list_element = NULL; |
978 | struct notification_client_list_element *client_list_element = NULL; | |
979 | enum lttng_notification_channel_status status = | |
980 | LTTNG_NOTIFICATION_CHANNEL_STATUS_OK; | |
981 | ||
982 | /* | |
983 | * Ensure that the client has not already subscribed to this condition | |
984 | * before. | |
985 | */ | |
986 | cds_list_for_each_entry(condition_list_element, &client->condition_list, node) { | |
987 | if (lttng_condition_is_equal(condition_list_element->condition, | |
988 | condition)) { | |
989 | status = LTTNG_NOTIFICATION_CHANNEL_STATUS_ALREADY_SUBSCRIBED; | |
990 | goto end; | |
991 | } | |
992 | } | |
993 | ||
994 | condition_list_element = zmalloc(sizeof(*condition_list_element)); | |
995 | if (!condition_list_element) { | |
996 | ret = -1; | |
997 | goto error; | |
998 | } | |
999 | client_list_element = zmalloc(sizeof(*client_list_element)); | |
1000 | if (!client_list_element) { | |
1001 | ret = -1; | |
1002 | goto error; | |
1003 | } | |
1004 | ||
ab0ee2ca JG |
1005 | /* |
1006 | * Add the newly-subscribed condition to the client's subscription list. | |
1007 | */ | |
1008 | CDS_INIT_LIST_HEAD(&condition_list_element->node); | |
1009 | condition_list_element->condition = condition; | |
1010 | cds_list_add(&condition_list_element->node, &client->condition_list); | |
1011 | ||
ed327204 JG |
1012 | client_list = get_client_list_from_condition(state, condition); |
1013 | if (!client_list) { | |
2ae99f0b JG |
1014 | /* |
1015 | * No notification-emiting trigger registered with this | |
1016 | * condition. We don't evaluate the condition right away | |
1017 | * since this trigger is not registered yet. | |
1018 | */ | |
4fb43b68 | 1019 | free(client_list_element); |
505b2d90 | 1020 | goto end; |
ab0ee2ca JG |
1021 | } |
1022 | ||
2ae99f0b JG |
1023 | /* |
1024 | * The condition to which the client just subscribed is evaluated | |
1025 | * at this point so that conditions that are already TRUE result | |
1026 | * in a notification being sent out. | |
505b2d90 JG |
1027 | * |
1028 | * The client_list's trigger is used without locking the list itself. | |
1029 | * This is correct since the list doesn't own the trigger and the | |
1030 | * object is immutable. | |
2ae99f0b | 1031 | */ |
e4db5ace JR |
1032 | if (evaluate_condition_for_client(client_list->trigger, condition, |
1033 | client, state)) { | |
1034 | WARN("[notification-thread] Evaluation of a condition on client subscription failed, aborting."); | |
1035 | ret = -1; | |
4bd5b4af | 1036 | free(client_list_element); |
505b2d90 | 1037 | goto end; |
e4db5ace JR |
1038 | } |
1039 | ||
1040 | /* | |
1041 | * Add the client to the list of clients interested in a given trigger | |
1042 | * if a "notification" trigger with a corresponding condition was | |
1043 | * added prior. | |
1044 | */ | |
ab0ee2ca JG |
1045 | client_list_element->client = client; |
1046 | CDS_INIT_LIST_HEAD(&client_list_element->node); | |
505b2d90 JG |
1047 | |
1048 | pthread_mutex_lock(&client_list->lock); | |
ab0ee2ca | 1049 | cds_list_add(&client_list_element->node, &client_list->list); |
505b2d90 | 1050 | pthread_mutex_unlock(&client_list->lock); |
ab0ee2ca JG |
1051 | end: |
1052 | if (_status) { | |
1053 | *_status = status; | |
1054 | } | |
505b2d90 JG |
1055 | if (client_list) { |
1056 | notification_client_list_put(client_list); | |
1057 | } | |
ab0ee2ca JG |
1058 | return ret; |
1059 | error: | |
1060 | free(condition_list_element); | |
1061 | free(client_list_element); | |
1062 | return ret; | |
1063 | } | |
1064 | ||
1065 | static | |
1066 | int notification_thread_client_unsubscribe( | |
1067 | struct notification_client *client, | |
1068 | struct lttng_condition *condition, | |
1069 | struct notification_thread_state *state, | |
1070 | enum lttng_notification_channel_status *_status) | |
1071 | { | |
ab0ee2ca JG |
1072 | struct notification_client_list *client_list; |
1073 | struct lttng_condition_list_element *condition_list_element, | |
1074 | *condition_tmp; | |
1075 | struct notification_client_list_element *client_list_element, | |
1076 | *client_tmp; | |
1077 | bool condition_found = false; | |
1078 | enum lttng_notification_channel_status status = | |
1079 | LTTNG_NOTIFICATION_CHANNEL_STATUS_OK; | |
1080 | ||
1081 | /* Remove the condition from the client's condition list. */ | |
1082 | cds_list_for_each_entry_safe(condition_list_element, condition_tmp, | |
1083 | &client->condition_list, node) { | |
1084 | if (!lttng_condition_is_equal(condition_list_element->condition, | |
1085 | condition)) { | |
1086 | continue; | |
1087 | } | |
1088 | ||
1089 | cds_list_del(&condition_list_element->node); | |
1090 | /* | |
1091 | * The caller may be iterating on the client's conditions to | |
1092 | * tear down a client's connection. In this case, the condition | |
1093 | * will be destroyed at the end. | |
1094 | */ | |
1095 | if (condition != condition_list_element->condition) { | |
1096 | lttng_condition_destroy( | |
1097 | condition_list_element->condition); | |
1098 | } | |
1099 | free(condition_list_element); | |
1100 | condition_found = true; | |
1101 | break; | |
1102 | } | |
1103 | ||
1104 | if (!condition_found) { | |
1105 | status = LTTNG_NOTIFICATION_CHANNEL_STATUS_UNKNOWN_CONDITION; | |
1106 | goto end; | |
1107 | } | |
1108 | ||
1109 | /* | |
1110 | * Remove the client from the list of clients interested the trigger | |
1111 | * matching the condition. | |
1112 | */ | |
ed327204 JG |
1113 | client_list = get_client_list_from_condition(state, condition); |
1114 | if (!client_list) { | |
505b2d90 | 1115 | goto end; |
ab0ee2ca JG |
1116 | } |
1117 | ||
505b2d90 | 1118 | pthread_mutex_lock(&client_list->lock); |
ab0ee2ca JG |
1119 | cds_list_for_each_entry_safe(client_list_element, client_tmp, |
1120 | &client_list->list, node) { | |
505b2d90 | 1121 | if (client_list_element->client->id != client->id) { |
ab0ee2ca JG |
1122 | continue; |
1123 | } | |
1124 | cds_list_del(&client_list_element->node); | |
1125 | free(client_list_element); | |
1126 | break; | |
1127 | } | |
505b2d90 JG |
1128 | pthread_mutex_unlock(&client_list->lock); |
1129 | notification_client_list_put(client_list); | |
1130 | client_list = NULL; | |
ab0ee2ca JG |
1131 | end: |
1132 | lttng_condition_destroy(condition); | |
1133 | if (_status) { | |
1134 | *_status = status; | |
1135 | } | |
1136 | return 0; | |
1137 | } | |
1138 | ||
83b934ad MD |
1139 | static |
1140 | void free_notification_client_rcu(struct rcu_head *node) | |
1141 | { | |
1142 | free(caa_container_of(node, struct notification_client, rcu_node)); | |
1143 | } | |
1144 | ||
ab0ee2ca JG |
1145 | static |
1146 | void notification_client_destroy(struct notification_client *client, | |
1147 | struct notification_thread_state *state) | |
1148 | { | |
ab0ee2ca JG |
1149 | if (!client) { |
1150 | return; | |
1151 | } | |
1152 | ||
505b2d90 JG |
1153 | /* |
1154 | * The client object is not reachable by other threads, no need to lock | |
1155 | * the client here. | |
1156 | */ | |
ab0ee2ca JG |
1157 | if (client->socket >= 0) { |
1158 | (void) lttcomm_close_unix_sock(client->socket); | |
ac1889bf | 1159 | client->socket = -1; |
ab0ee2ca | 1160 | } |
505b2d90 | 1161 | client->communication.active = false; |
882093ee JR |
1162 | lttng_payload_reset(&client->communication.inbound.payload); |
1163 | lttng_payload_reset(&client->communication.outbound.payload); | |
505b2d90 | 1164 | pthread_mutex_destroy(&client->lock); |
83b934ad | 1165 | call_rcu(&client->rcu_node, free_notification_client_rcu); |
ab0ee2ca JG |
1166 | } |
1167 | ||
1168 | /* | |
1169 | * Call with rcu_read_lock held (and hold for the lifetime of the returned | |
1170 | * client pointer). | |
1171 | */ | |
1172 | static | |
1173 | struct notification_client *get_client_from_socket(int socket, | |
1174 | struct notification_thread_state *state) | |
1175 | { | |
1176 | struct cds_lfht_iter iter; | |
1177 | struct cds_lfht_node *node; | |
1178 | struct notification_client *client = NULL; | |
1179 | ||
1180 | cds_lfht_lookup(state->client_socket_ht, | |
ac1889bf JG |
1181 | hash_client_socket(socket), |
1182 | match_client_socket, | |
ab0ee2ca JG |
1183 | (void *) (unsigned long) socket, |
1184 | &iter); | |
1185 | node = cds_lfht_iter_get_node(&iter); | |
1186 | if (!node) { | |
1187 | goto end; | |
1188 | } | |
1189 | ||
1190 | client = caa_container_of(node, struct notification_client, | |
1191 | client_socket_ht_node); | |
1192 | end: | |
1193 | return client; | |
1194 | } | |
1195 | ||
f2b3ef9f JG |
1196 | /* |
1197 | * Call with rcu_read_lock held (and hold for the lifetime of the returned | |
1198 | * client pointer). | |
1199 | */ | |
1200 | static | |
1201 | struct notification_client *get_client_from_id(notification_client_id id, | |
1202 | struct notification_thread_state *state) | |
1203 | { | |
1204 | struct cds_lfht_iter iter; | |
1205 | struct cds_lfht_node *node; | |
1206 | struct notification_client *client = NULL; | |
1207 | ||
1208 | cds_lfht_lookup(state->client_id_ht, | |
1209 | hash_client_id(id), | |
1210 | match_client_id, | |
1211 | &id, | |
1212 | &iter); | |
1213 | node = cds_lfht_iter_get_node(&iter); | |
1214 | if (!node) { | |
1215 | goto end; | |
1216 | } | |
1217 | ||
1218 | client = caa_container_of(node, struct notification_client, | |
1219 | client_id_ht_node); | |
1220 | end: | |
1221 | return client; | |
1222 | } | |
1223 | ||
ab0ee2ca | 1224 | static |
e8360425 | 1225 | bool buffer_usage_condition_applies_to_channel( |
51eab943 JG |
1226 | const struct lttng_condition *condition, |
1227 | const struct channel_info *channel_info) | |
ab0ee2ca JG |
1228 | { |
1229 | enum lttng_condition_status status; | |
e8360425 JD |
1230 | enum lttng_domain_type condition_domain; |
1231 | const char *condition_session_name = NULL; | |
1232 | const char *condition_channel_name = NULL; | |
ab0ee2ca | 1233 | |
e8360425 JD |
1234 | status = lttng_condition_buffer_usage_get_domain_type(condition, |
1235 | &condition_domain); | |
1236 | assert(status == LTTNG_CONDITION_STATUS_OK); | |
1237 | if (channel_info->key.domain != condition_domain) { | |
ab0ee2ca JG |
1238 | goto fail; |
1239 | } | |
1240 | ||
e8360425 JD |
1241 | status = lttng_condition_buffer_usage_get_session_name( |
1242 | condition, &condition_session_name); | |
1243 | assert((status == LTTNG_CONDITION_STATUS_OK) && condition_session_name); | |
1244 | ||
1245 | status = lttng_condition_buffer_usage_get_channel_name( | |
1246 | condition, &condition_channel_name); | |
1247 | assert((status == LTTNG_CONDITION_STATUS_OK) && condition_channel_name); | |
1248 | ||
1249 | if (strcmp(channel_info->session_info->name, condition_session_name)) { | |
1250 | goto fail; | |
1251 | } | |
1252 | if (strcmp(channel_info->name, condition_channel_name)) { | |
ab0ee2ca JG |
1253 | goto fail; |
1254 | } | |
1255 | ||
e8360425 JD |
1256 | return true; |
1257 | fail: | |
1258 | return false; | |
1259 | } | |
1260 | ||
1261 | static | |
1262 | bool session_consumed_size_condition_applies_to_channel( | |
51eab943 JG |
1263 | const struct lttng_condition *condition, |
1264 | const struct channel_info *channel_info) | |
e8360425 JD |
1265 | { |
1266 | enum lttng_condition_status status; | |
1267 | const char *condition_session_name = NULL; | |
1268 | ||
1269 | status = lttng_condition_session_consumed_size_get_session_name( | |
1270 | condition, &condition_session_name); | |
1271 | assert((status == LTTNG_CONDITION_STATUS_OK) && condition_session_name); | |
1272 | ||
1273 | if (strcmp(channel_info->session_info->name, condition_session_name)) { | |
ab0ee2ca JG |
1274 | goto fail; |
1275 | } | |
1276 | ||
e8360425 JD |
1277 | return true; |
1278 | fail: | |
1279 | return false; | |
1280 | } | |
ab0ee2ca | 1281 | |
51eab943 JG |
1282 | static |
1283 | bool trigger_applies_to_channel(const struct lttng_trigger *trigger, | |
1284 | const struct channel_info *channel_info) | |
1285 | { | |
1286 | const struct lttng_condition *condition; | |
e8360425 | 1287 | bool trigger_applies; |
ab0ee2ca | 1288 | |
51eab943 | 1289 | condition = lttng_trigger_get_const_condition(trigger); |
e8360425 | 1290 | if (!condition) { |
ab0ee2ca JG |
1291 | goto fail; |
1292 | } | |
e8360425 JD |
1293 | |
1294 | switch (lttng_condition_get_type(condition)) { | |
1295 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
1296 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
1297 | trigger_applies = buffer_usage_condition_applies_to_channel( | |
1298 | condition, channel_info); | |
1299 | break; | |
1300 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
1301 | trigger_applies = session_consumed_size_condition_applies_to_channel( | |
1302 | condition, channel_info); | |
1303 | break; | |
1304 | default: | |
ab0ee2ca JG |
1305 | goto fail; |
1306 | } | |
1307 | ||
e8360425 | 1308 | return trigger_applies; |
ab0ee2ca JG |
1309 | fail: |
1310 | return false; | |
1311 | } | |
1312 | ||
1313 | static | |
1314 | bool trigger_applies_to_client(struct lttng_trigger *trigger, | |
1315 | struct notification_client *client) | |
1316 | { | |
1317 | bool applies = false; | |
1318 | struct lttng_condition_list_element *condition_list_element; | |
1319 | ||
1320 | cds_list_for_each_entry(condition_list_element, &client->condition_list, | |
1321 | node) { | |
1322 | applies = lttng_condition_is_equal( | |
1323 | condition_list_element->condition, | |
1324 | lttng_trigger_get_condition(trigger)); | |
1325 | if (applies) { | |
1326 | break; | |
1327 | } | |
1328 | } | |
1329 | return applies; | |
1330 | } | |
1331 | ||
ed327204 JG |
1332 | /* Must be called with RCU read lock held. */ |
1333 | static | |
1334 | struct lttng_session_trigger_list *get_session_trigger_list( | |
1335 | struct notification_thread_state *state, | |
1336 | const char *session_name) | |
1337 | { | |
1338 | struct lttng_session_trigger_list *list = NULL; | |
1339 | struct cds_lfht_node *node; | |
1340 | struct cds_lfht_iter iter; | |
1341 | ||
1342 | cds_lfht_lookup(state->session_triggers_ht, | |
1343 | hash_key_str(session_name, lttng_ht_seed), | |
1344 | match_session_trigger_list, | |
1345 | session_name, | |
1346 | &iter); | |
1347 | node = cds_lfht_iter_get_node(&iter); | |
1348 | if (!node) { | |
1349 | /* | |
1350 | * Not an error, the list of triggers applying to that session | |
1351 | * will be initialized when the session is created. | |
1352 | */ | |
1353 | DBG("[notification-thread] No trigger list found for session \"%s\" as it is not yet known to the notification system", | |
1354 | session_name); | |
1355 | goto end; | |
1356 | } | |
1357 | ||
e742b055 | 1358 | list = caa_container_of(node, |
ed327204 JG |
1359 | struct lttng_session_trigger_list, |
1360 | session_triggers_ht_node); | |
1361 | end: | |
1362 | return list; | |
1363 | } | |
1364 | ||
ea9a44f0 JG |
1365 | /* |
1366 | * Allocate an empty lttng_session_trigger_list for the session named | |
1367 | * 'session_name'. | |
1368 | * | |
1369 | * No ownership of 'session_name' is assumed by the session trigger list. | |
1370 | * It is the caller's responsability to ensure the session name is alive | |
1371 | * for as long as this list is. | |
1372 | */ | |
1373 | static | |
1374 | struct lttng_session_trigger_list *lttng_session_trigger_list_create( | |
1375 | const char *session_name, | |
1376 | struct cds_lfht *session_triggers_ht) | |
1377 | { | |
1378 | struct lttng_session_trigger_list *list; | |
1379 | ||
1380 | list = zmalloc(sizeof(*list)); | |
1381 | if (!list) { | |
1382 | goto end; | |
1383 | } | |
1384 | list->session_name = session_name; | |
1385 | CDS_INIT_LIST_HEAD(&list->list); | |
1386 | cds_lfht_node_init(&list->session_triggers_ht_node); | |
1387 | list->session_triggers_ht = session_triggers_ht; | |
1388 | ||
1389 | rcu_read_lock(); | |
1390 | /* Publish the list through the session_triggers_ht. */ | |
1391 | cds_lfht_add(session_triggers_ht, | |
1392 | hash_key_str(session_name, lttng_ht_seed), | |
1393 | &list->session_triggers_ht_node); | |
1394 | rcu_read_unlock(); | |
1395 | end: | |
1396 | return list; | |
1397 | } | |
1398 | ||
1399 | static | |
1400 | void free_session_trigger_list_rcu(struct rcu_head *node) | |
1401 | { | |
1402 | free(caa_container_of(node, struct lttng_session_trigger_list, | |
1403 | rcu_node)); | |
1404 | } | |
1405 | ||
1406 | static | |
1407 | void lttng_session_trigger_list_destroy(struct lttng_session_trigger_list *list) | |
1408 | { | |
1409 | struct lttng_trigger_list_element *trigger_list_element, *tmp; | |
1410 | ||
1411 | /* Empty the list element by element, and then free the list itself. */ | |
1412 | cds_list_for_each_entry_safe(trigger_list_element, tmp, | |
1413 | &list->list, node) { | |
1414 | cds_list_del(&trigger_list_element->node); | |
1415 | free(trigger_list_element); | |
1416 | } | |
1417 | rcu_read_lock(); | |
1418 | /* Unpublish the list from the session_triggers_ht. */ | |
1419 | cds_lfht_del(list->session_triggers_ht, | |
1420 | &list->session_triggers_ht_node); | |
1421 | rcu_read_unlock(); | |
1422 | call_rcu(&list->rcu_node, free_session_trigger_list_rcu); | |
1423 | } | |
1424 | ||
1425 | static | |
1426 | int lttng_session_trigger_list_add(struct lttng_session_trigger_list *list, | |
f2b3ef9f | 1427 | struct lttng_trigger *trigger) |
ea9a44f0 JG |
1428 | { |
1429 | int ret = 0; | |
1430 | struct lttng_trigger_list_element *new_element = | |
1431 | zmalloc(sizeof(*new_element)); | |
1432 | ||
1433 | if (!new_element) { | |
1434 | ret = -1; | |
1435 | goto end; | |
1436 | } | |
1437 | CDS_INIT_LIST_HEAD(&new_element->node); | |
1438 | new_element->trigger = trigger; | |
1439 | cds_list_add(&new_element->node, &list->list); | |
1440 | end: | |
1441 | return ret; | |
1442 | } | |
1443 | ||
1444 | static | |
1445 | bool trigger_applies_to_session(const struct lttng_trigger *trigger, | |
1446 | const char *session_name) | |
1447 | { | |
1448 | bool applies = false; | |
1449 | const struct lttng_condition *condition; | |
1450 | ||
1451 | condition = lttng_trigger_get_const_condition(trigger); | |
1452 | switch (lttng_condition_get_type(condition)) { | |
1453 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
1454 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
1455 | { | |
1456 | enum lttng_condition_status condition_status; | |
1457 | const char *condition_session_name; | |
1458 | ||
1459 | condition_status = lttng_condition_session_rotation_get_session_name( | |
1460 | condition, &condition_session_name); | |
1461 | if (condition_status != LTTNG_CONDITION_STATUS_OK) { | |
1462 | ERR("[notification-thread] Failed to retrieve session rotation condition's session name"); | |
1463 | goto end; | |
1464 | } | |
1465 | ||
1466 | assert(condition_session_name); | |
1467 | applies = !strcmp(condition_session_name, session_name); | |
1468 | break; | |
1469 | } | |
1470 | default: | |
1471 | goto end; | |
1472 | } | |
1473 | end: | |
1474 | return applies; | |
1475 | } | |
1476 | ||
1477 | /* | |
1478 | * Allocate and initialize an lttng_session_trigger_list which contains | |
1479 | * all triggers that apply to the session named 'session_name'. | |
1480 | * | |
1481 | * No ownership of 'session_name' is assumed by the session trigger list. | |
1482 | * It is the caller's responsability to ensure the session name is alive | |
1483 | * for as long as this list is. | |
1484 | */ | |
1485 | static | |
1486 | struct lttng_session_trigger_list *lttng_session_trigger_list_build( | |
1487 | const struct notification_thread_state *state, | |
1488 | const char *session_name) | |
1489 | { | |
1490 | int trigger_count = 0; | |
1491 | struct lttng_session_trigger_list *session_trigger_list = NULL; | |
1492 | struct lttng_trigger_ht_element *trigger_ht_element = NULL; | |
1493 | struct cds_lfht_iter iter; | |
1494 | ||
1495 | session_trigger_list = lttng_session_trigger_list_create(session_name, | |
1496 | state->session_triggers_ht); | |
1497 | ||
1498 | /* Add all triggers applying to the session named 'session_name'. */ | |
1499 | cds_lfht_for_each_entry(state->triggers_ht, &iter, trigger_ht_element, | |
1500 | node) { | |
1501 | int ret; | |
1502 | ||
1503 | if (!trigger_applies_to_session(trigger_ht_element->trigger, | |
1504 | session_name)) { | |
1505 | continue; | |
1506 | } | |
1507 | ||
1508 | ret = lttng_session_trigger_list_add(session_trigger_list, | |
1509 | trigger_ht_element->trigger); | |
1510 | if (ret) { | |
1511 | goto error; | |
1512 | } | |
1513 | ||
1514 | trigger_count++; | |
1515 | } | |
1516 | ||
1517 | DBG("[notification-thread] Found %i triggers that apply to newly created session", | |
1518 | trigger_count); | |
1519 | return session_trigger_list; | |
1520 | error: | |
1521 | lttng_session_trigger_list_destroy(session_trigger_list); | |
1522 | return NULL; | |
1523 | } | |
1524 | ||
8abe313a JG |
1525 | static |
1526 | struct session_info *find_or_create_session_info( | |
1527 | struct notification_thread_state *state, | |
1528 | const char *name, uid_t uid, gid_t gid) | |
1529 | { | |
1530 | struct session_info *session = NULL; | |
1531 | struct cds_lfht_node *node; | |
1532 | struct cds_lfht_iter iter; | |
ea9a44f0 | 1533 | struct lttng_session_trigger_list *trigger_list; |
8abe313a JG |
1534 | |
1535 | rcu_read_lock(); | |
1536 | cds_lfht_lookup(state->sessions_ht, | |
1537 | hash_key_str(name, lttng_ht_seed), | |
1538 | match_session, | |
1539 | name, | |
1540 | &iter); | |
1541 | node = cds_lfht_iter_get_node(&iter); | |
1542 | if (node) { | |
1543 | DBG("[notification-thread] Found session info of session \"%s\" (uid = %i, gid = %i)", | |
1544 | name, uid, gid); | |
1545 | session = caa_container_of(node, struct session_info, | |
1546 | sessions_ht_node); | |
1547 | assert(session->uid == uid); | |
1548 | assert(session->gid == gid); | |
1eee26c5 JG |
1549 | session_info_get(session); |
1550 | goto end; | |
ea9a44f0 JG |
1551 | } |
1552 | ||
1553 | trigger_list = lttng_session_trigger_list_build(state, name); | |
1554 | if (!trigger_list) { | |
1555 | goto error; | |
8abe313a JG |
1556 | } |
1557 | ||
1eee26c5 JG |
1558 | session = session_info_create(name, uid, gid, trigger_list, |
1559 | state->sessions_ht); | |
8abe313a JG |
1560 | if (!session) { |
1561 | ERR("[notification-thread] Failed to allocation session info for session \"%s\" (uid = %i, gid = %i)", | |
1562 | name, uid, gid); | |
b248644d | 1563 | lttng_session_trigger_list_destroy(trigger_list); |
ea9a44f0 | 1564 | goto error; |
8abe313a | 1565 | } |
ea9a44f0 | 1566 | trigger_list = NULL; |
577983cb JG |
1567 | |
1568 | cds_lfht_add(state->sessions_ht, hash_key_str(name, lttng_ht_seed), | |
9b63a4aa | 1569 | &session->sessions_ht_node); |
1eee26c5 | 1570 | end: |
8abe313a JG |
1571 | rcu_read_unlock(); |
1572 | return session; | |
ea9a44f0 JG |
1573 | error: |
1574 | rcu_read_unlock(); | |
1575 | session_info_put(session); | |
1576 | return NULL; | |
8abe313a JG |
1577 | } |
1578 | ||
ab0ee2ca JG |
1579 | static |
1580 | int handle_notification_thread_command_add_channel( | |
8abe313a JG |
1581 | struct notification_thread_state *state, |
1582 | const char *session_name, uid_t session_uid, gid_t session_gid, | |
1583 | const char *channel_name, enum lttng_domain_type channel_domain, | |
1584 | uint64_t channel_key_int, uint64_t channel_capacity, | |
1585 | enum lttng_error_code *cmd_result) | |
ab0ee2ca JG |
1586 | { |
1587 | struct cds_list_head trigger_list; | |
8abe313a JG |
1588 | struct channel_info *new_channel_info = NULL; |
1589 | struct channel_key channel_key = { | |
1590 | .key = channel_key_int, | |
1591 | .domain = channel_domain, | |
1592 | }; | |
ab0ee2ca JG |
1593 | struct lttng_channel_trigger_list *channel_trigger_list = NULL; |
1594 | struct lttng_trigger_ht_element *trigger_ht_element = NULL; | |
1595 | int trigger_count = 0; | |
1596 | struct cds_lfht_iter iter; | |
8abe313a | 1597 | struct session_info *session_info = NULL; |
ab0ee2ca JG |
1598 | |
1599 | DBG("[notification-thread] Adding channel %s from session %s, channel key = %" PRIu64 " in %s domain", | |
8abe313a JG |
1600 | channel_name, session_name, channel_key_int, |
1601 | channel_domain == LTTNG_DOMAIN_KERNEL ? "kernel" : "user space"); | |
ab0ee2ca JG |
1602 | |
1603 | CDS_INIT_LIST_HEAD(&trigger_list); | |
1604 | ||
8abe313a JG |
1605 | session_info = find_or_create_session_info(state, session_name, |
1606 | session_uid, session_gid); | |
1607 | if (!session_info) { | |
a9577b76 | 1608 | /* Allocation error or an internal error occurred. */ |
ab0ee2ca JG |
1609 | goto error; |
1610 | } | |
1611 | ||
8abe313a JG |
1612 | new_channel_info = channel_info_create(channel_name, &channel_key, |
1613 | channel_capacity, session_info); | |
1614 | if (!new_channel_info) { | |
1615 | goto error; | |
1616 | } | |
ab0ee2ca | 1617 | |
83b934ad | 1618 | rcu_read_lock(); |
ab0ee2ca JG |
1619 | /* Build a list of all triggers applying to the new channel. */ |
1620 | cds_lfht_for_each_entry(state->triggers_ht, &iter, trigger_ht_element, | |
1621 | node) { | |
1622 | struct lttng_trigger_list_element *new_element; | |
1623 | ||
1624 | if (!trigger_applies_to_channel(trigger_ht_element->trigger, | |
8abe313a | 1625 | new_channel_info)) { |
ab0ee2ca JG |
1626 | continue; |
1627 | } | |
1628 | ||
1629 | new_element = zmalloc(sizeof(*new_element)); | |
1630 | if (!new_element) { | |
83b934ad | 1631 | rcu_read_unlock(); |
ab0ee2ca JG |
1632 | goto error; |
1633 | } | |
1634 | CDS_INIT_LIST_HEAD(&new_element->node); | |
1635 | new_element->trigger = trigger_ht_element->trigger; | |
1636 | cds_list_add(&new_element->node, &trigger_list); | |
1637 | trigger_count++; | |
1638 | } | |
83b934ad | 1639 | rcu_read_unlock(); |
ab0ee2ca JG |
1640 | |
1641 | DBG("[notification-thread] Found %i triggers that apply to newly added channel", | |
1642 | trigger_count); | |
1643 | channel_trigger_list = zmalloc(sizeof(*channel_trigger_list)); | |
1644 | if (!channel_trigger_list) { | |
1645 | goto error; | |
1646 | } | |
8abe313a | 1647 | channel_trigger_list->channel_key = new_channel_info->key; |
ab0ee2ca JG |
1648 | CDS_INIT_LIST_HEAD(&channel_trigger_list->list); |
1649 | cds_lfht_node_init(&channel_trigger_list->channel_triggers_ht_node); | |
1650 | cds_list_splice(&trigger_list, &channel_trigger_list->list); | |
1651 | ||
1652 | rcu_read_lock(); | |
1653 | /* Add channel to the channel_ht which owns the channel_infos. */ | |
1654 | cds_lfht_add(state->channels_ht, | |
8abe313a | 1655 | hash_channel_key(&new_channel_info->key), |
ab0ee2ca JG |
1656 | &new_channel_info->channels_ht_node); |
1657 | /* | |
1658 | * Add the list of triggers associated with this channel to the | |
1659 | * channel_triggers_ht. | |
1660 | */ | |
1661 | cds_lfht_add(state->channel_triggers_ht, | |
8abe313a | 1662 | hash_channel_key(&new_channel_info->key), |
ab0ee2ca JG |
1663 | &channel_trigger_list->channel_triggers_ht_node); |
1664 | rcu_read_unlock(); | |
1eee26c5 | 1665 | session_info_put(session_info); |
ab0ee2ca JG |
1666 | *cmd_result = LTTNG_OK; |
1667 | return 0; | |
1668 | error: | |
ab0ee2ca | 1669 | channel_info_destroy(new_channel_info); |
8abe313a | 1670 | session_info_put(session_info); |
ab0ee2ca JG |
1671 | return 1; |
1672 | } | |
1673 | ||
83b934ad MD |
1674 | static |
1675 | void free_channel_trigger_list_rcu(struct rcu_head *node) | |
1676 | { | |
1677 | free(caa_container_of(node, struct lttng_channel_trigger_list, | |
1678 | rcu_node)); | |
1679 | } | |
1680 | ||
1681 | static | |
1682 | void free_channel_state_sample_rcu(struct rcu_head *node) | |
1683 | { | |
1684 | free(caa_container_of(node, struct channel_state_sample, | |
1685 | rcu_node)); | |
1686 | } | |
1687 | ||
ab0ee2ca JG |
1688 | static |
1689 | int handle_notification_thread_command_remove_channel( | |
1690 | struct notification_thread_state *state, | |
1691 | uint64_t channel_key, enum lttng_domain_type domain, | |
1692 | enum lttng_error_code *cmd_result) | |
1693 | { | |
1694 | struct cds_lfht_node *node; | |
1695 | struct cds_lfht_iter iter; | |
1696 | struct lttng_channel_trigger_list *trigger_list; | |
1697 | struct lttng_trigger_list_element *trigger_list_element, *tmp; | |
1698 | struct channel_key key = { .key = channel_key, .domain = domain }; | |
1699 | struct channel_info *channel_info; | |
1700 | ||
1701 | DBG("[notification-thread] Removing channel key = %" PRIu64 " in %s domain", | |
1702 | channel_key, domain == LTTNG_DOMAIN_KERNEL ? "kernel" : "user space"); | |
1703 | ||
1704 | rcu_read_lock(); | |
1705 | ||
1706 | cds_lfht_lookup(state->channel_triggers_ht, | |
1707 | hash_channel_key(&key), | |
1708 | match_channel_trigger_list, | |
1709 | &key, | |
1710 | &iter); | |
1711 | node = cds_lfht_iter_get_node(&iter); | |
1712 | /* | |
1713 | * There is a severe internal error if we are being asked to remove a | |
1714 | * channel that doesn't exist. | |
1715 | */ | |
1716 | if (!node) { | |
1717 | ERR("[notification-thread] Channel being removed is unknown to the notification thread"); | |
1718 | goto end; | |
1719 | } | |
1720 | ||
1721 | /* Free the list of triggers associated with this channel. */ | |
1722 | trigger_list = caa_container_of(node, struct lttng_channel_trigger_list, | |
1723 | channel_triggers_ht_node); | |
1724 | cds_list_for_each_entry_safe(trigger_list_element, tmp, | |
1725 | &trigger_list->list, node) { | |
1726 | cds_list_del(&trigger_list_element->node); | |
1727 | free(trigger_list_element); | |
1728 | } | |
1729 | cds_lfht_del(state->channel_triggers_ht, node); | |
83b934ad | 1730 | call_rcu(&trigger_list->rcu_node, free_channel_trigger_list_rcu); |
ab0ee2ca JG |
1731 | |
1732 | /* Free sampled channel state. */ | |
1733 | cds_lfht_lookup(state->channel_state_ht, | |
1734 | hash_channel_key(&key), | |
1735 | match_channel_state_sample, | |
1736 | &key, | |
1737 | &iter); | |
1738 | node = cds_lfht_iter_get_node(&iter); | |
1739 | /* | |
1740 | * This is expected to be NULL if the channel is destroyed before we | |
1741 | * received a sample. | |
1742 | */ | |
1743 | if (node) { | |
1744 | struct channel_state_sample *sample = caa_container_of(node, | |
1745 | struct channel_state_sample, | |
1746 | channel_state_ht_node); | |
1747 | ||
1748 | cds_lfht_del(state->channel_state_ht, node); | |
83b934ad | 1749 | call_rcu(&sample->rcu_node, free_channel_state_sample_rcu); |
ab0ee2ca JG |
1750 | } |
1751 | ||
1752 | /* Remove the channel from the channels_ht and free it. */ | |
1753 | cds_lfht_lookup(state->channels_ht, | |
1754 | hash_channel_key(&key), | |
1755 | match_channel_info, | |
1756 | &key, | |
1757 | &iter); | |
1758 | node = cds_lfht_iter_get_node(&iter); | |
1759 | assert(node); | |
1760 | channel_info = caa_container_of(node, struct channel_info, | |
1761 | channels_ht_node); | |
1762 | cds_lfht_del(state->channels_ht, node); | |
1763 | channel_info_destroy(channel_info); | |
1764 | end: | |
1765 | rcu_read_unlock(); | |
1766 | *cmd_result = LTTNG_OK; | |
1767 | return 0; | |
1768 | } | |
1769 | ||
0ca52944 | 1770 | static |
ed327204 | 1771 | int handle_notification_thread_command_session_rotation( |
0ca52944 | 1772 | struct notification_thread_state *state, |
ed327204 JG |
1773 | enum notification_thread_command_type cmd_type, |
1774 | const char *session_name, uid_t session_uid, gid_t session_gid, | |
1775 | uint64_t trace_archive_chunk_id, | |
1776 | struct lttng_trace_archive_location *location, | |
1777 | enum lttng_error_code *_cmd_result) | |
0ca52944 | 1778 | { |
ed327204 JG |
1779 | int ret = 0; |
1780 | enum lttng_error_code cmd_result = LTTNG_OK; | |
1781 | struct lttng_session_trigger_list *trigger_list; | |
1782 | struct lttng_trigger_list_element *trigger_list_element; | |
1783 | struct session_info *session_info; | |
f2b3ef9f | 1784 | const struct lttng_credentials session_creds = { |
ff588497 JR |
1785 | .uid = LTTNG_OPTIONAL_INIT_VALUE(session_uid), |
1786 | .gid = LTTNG_OPTIONAL_INIT_VALUE(session_gid), | |
f2b3ef9f | 1787 | }; |
0ca52944 | 1788 | |
ed327204 JG |
1789 | rcu_read_lock(); |
1790 | ||
1791 | session_info = find_or_create_session_info(state, session_name, | |
1792 | session_uid, session_gid); | |
1793 | if (!session_info) { | |
a9577b76 | 1794 | /* Allocation error or an internal error occurred. */ |
ed327204 JG |
1795 | ret = -1; |
1796 | cmd_result = LTTNG_ERR_NOMEM; | |
1797 | goto end; | |
1798 | } | |
1799 | ||
1800 | session_info->rotation.ongoing = | |
1801 | cmd_type == NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING; | |
1802 | session_info->rotation.id = trace_archive_chunk_id; | |
1803 | trigger_list = get_session_trigger_list(state, session_name); | |
1804 | if (!trigger_list) { | |
1805 | DBG("[notification-thread] No triggers applying to session \"%s\" found", | |
1806 | session_name); | |
1807 | goto end; | |
1808 | } | |
1809 | ||
1810 | cds_list_for_each_entry(trigger_list_element, &trigger_list->list, | |
1811 | node) { | |
1812 | const struct lttng_condition *condition; | |
f2b3ef9f | 1813 | struct lttng_trigger *trigger; |
ed327204 JG |
1814 | struct notification_client_list *client_list; |
1815 | struct lttng_evaluation *evaluation = NULL; | |
1816 | enum lttng_condition_type condition_type; | |
f2b3ef9f | 1817 | enum action_executor_status executor_status; |
ed327204 JG |
1818 | |
1819 | trigger = trigger_list_element->trigger; | |
1820 | condition = lttng_trigger_get_const_condition(trigger); | |
1821 | assert(condition); | |
1822 | condition_type = lttng_condition_get_type(condition); | |
1823 | ||
1824 | if (condition_type == LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING && | |
1825 | cmd_type != NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING) { | |
1826 | continue; | |
1827 | } else if (condition_type == LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED && | |
1828 | cmd_type != NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_COMPLETED) { | |
1829 | continue; | |
1830 | } | |
1831 | ||
ed327204 | 1832 | client_list = get_client_list_from_condition(state, condition); |
ed327204 JG |
1833 | if (cmd_type == NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING) { |
1834 | evaluation = lttng_evaluation_session_rotation_ongoing_create( | |
1835 | trace_archive_chunk_id); | |
1836 | } else { | |
1837 | evaluation = lttng_evaluation_session_rotation_completed_create( | |
1838 | trace_archive_chunk_id, location); | |
1839 | } | |
1840 | ||
1841 | if (!evaluation) { | |
1842 | /* Internal error */ | |
1843 | ret = -1; | |
1844 | cmd_result = LTTNG_ERR_UNK; | |
505b2d90 | 1845 | goto put_list; |
ed327204 JG |
1846 | } |
1847 | ||
f2b3ef9f JG |
1848 | /* |
1849 | * Ownership of `evaluation` transferred to the action executor | |
1850 | * no matter the result. | |
1851 | */ | |
1852 | executor_status = action_executor_enqueue(state->executor, | |
1853 | trigger, evaluation, &session_creds, | |
1854 | client_list); | |
1855 | evaluation = NULL; | |
1856 | switch (executor_status) { | |
1857 | case ACTION_EXECUTOR_STATUS_OK: | |
1858 | break; | |
1859 | case ACTION_EXECUTOR_STATUS_ERROR: | |
1860 | case ACTION_EXECUTOR_STATUS_INVALID: | |
1861 | /* | |
1862 | * TODO Add trigger identification (name/id) when | |
1863 | * it is added to the API. | |
1864 | */ | |
1865 | ERR("Fatal error occurred while enqueuing action associated with session rotation trigger"); | |
1866 | ret = -1; | |
1867 | goto put_list; | |
1868 | case ACTION_EXECUTOR_STATUS_OVERFLOW: | |
1869 | /* | |
1870 | * TODO Add trigger identification (name/id) when | |
1871 | * it is added to the API. | |
1872 | * | |
1873 | * Not a fatal error. | |
1874 | */ | |
1875 | WARN("No space left when enqueuing action associated with session rotation trigger"); | |
1876 | ret = 0; | |
1877 | goto put_list; | |
1878 | default: | |
1879 | abort(); | |
1880 | } | |
1881 | ||
505b2d90 JG |
1882 | put_list: |
1883 | notification_client_list_put(client_list); | |
ed327204 | 1884 | if (caa_unlikely(ret)) { |
505b2d90 | 1885 | break; |
ed327204 JG |
1886 | } |
1887 | } | |
1888 | end: | |
1889 | session_info_put(session_info); | |
1890 | *_cmd_result = cmd_result; | |
1891 | rcu_read_unlock(); | |
1892 | return ret; | |
0ca52944 JG |
1893 | } |
1894 | ||
d02d7404 JR |
1895 | static |
1896 | int handle_notification_thread_command_add_tracer_event_source( | |
1897 | struct notification_thread_state *state, | |
1898 | int tracer_event_source_fd, | |
1899 | enum lttng_domain_type domain_type, | |
1900 | enum lttng_error_code *_cmd_result) | |
1901 | { | |
1902 | int ret = 0; | |
1903 | enum lttng_error_code cmd_result = LTTNG_OK; | |
1904 | struct notification_event_tracer_event_source_element *element = NULL; | |
1905 | ||
1906 | element = zmalloc(sizeof(*element)); | |
1907 | if (!element) { | |
1908 | cmd_result = LTTNG_ERR_NOMEM; | |
1909 | ret = -1; | |
1910 | goto end; | |
1911 | } | |
1912 | ||
1913 | CDS_INIT_LIST_HEAD(&element->node); | |
1914 | element->fd = tracer_event_source_fd; | |
1915 | element->domain = domain_type; | |
1916 | ||
1917 | cds_list_add(&element->node, &state->tracer_event_sources_list); | |
1918 | ||
1919 | DBG3("[notification-thread] Adding tracer event source fd to poll set: tracer_event_source_fd = %d, domain = '%s'", | |
1920 | tracer_event_source_fd, | |
1921 | lttng_domain_type_str(domain_type)); | |
1922 | ||
1923 | /* Adding the read side pipe to the event poll. */ | |
1924 | ret = lttng_poll_add(&state->events, tracer_event_source_fd, LPOLLIN | LPOLLERR); | |
1925 | if (ret < 0) { | |
1926 | ERR("[notification-thread] Failed to add tracer event source to poll set: tracer_event_source_fd = %d, domain = '%s'", | |
1927 | tracer_event_source_fd, | |
1928 | lttng_domain_type_str(element->domain)); | |
1929 | cds_list_del(&element->node); | |
1930 | free(element); | |
1931 | goto end; | |
1932 | } | |
1933 | ||
1934 | element->is_fd_in_poll_set = true; | |
1935 | ||
1936 | end: | |
1937 | *_cmd_result = cmd_result; | |
1938 | return ret; | |
1939 | } | |
1940 | ||
1941 | static | |
1942 | int handle_notification_thread_command_remove_tracer_event_source( | |
1943 | struct notification_thread_state *state, | |
1944 | int tracer_event_source_fd, | |
1945 | enum lttng_error_code *_cmd_result) | |
1946 | { | |
1947 | int ret = 0; | |
1948 | enum lttng_error_code cmd_result = LTTNG_OK; | |
1949 | struct notification_event_tracer_event_source_element *source_element = NULL, *tmp; | |
1950 | ||
1951 | cds_list_for_each_entry_safe(source_element, tmp, | |
1952 | &state->tracer_event_sources_list, node) { | |
1953 | if (source_element->fd != tracer_event_source_fd) { | |
1954 | continue; | |
1955 | } | |
1956 | ||
1957 | DBG("[notification-thread] Removed tracer event source from poll set: tracer_event_source_fd = %d, domain = '%s'", | |
1958 | tracer_event_source_fd, | |
1959 | lttng_domain_type_str(source_element->domain)); | |
1960 | cds_list_del(&source_element->node); | |
1961 | break; | |
1962 | } | |
1963 | ||
1964 | /* It should always be found. */ | |
1965 | assert(source_element); | |
1966 | ||
1967 | if (!source_element->is_fd_in_poll_set) { | |
1968 | /* Skip the poll set removal. */ | |
1969 | goto end; | |
1970 | } | |
1971 | ||
1972 | DBG3("[notification-thread] Removing tracer event source from poll set: tracer_event_source_fd = %d, domain = '%s'", | |
1973 | tracer_event_source_fd, | |
1974 | lttng_domain_type_str(source_element->domain)); | |
1975 | ||
1976 | /* Removing the fd from the event poll set. */ | |
1977 | ret = lttng_poll_del(&state->events, tracer_event_source_fd); | |
1978 | if (ret < 0) { | |
1979 | ERR("[notification-thread] Failed to remove tracer event source from poll set: tracer_event_source_fd = %d, domain = '%s'", | |
1980 | tracer_event_source_fd, | |
1981 | lttng_domain_type_str(source_element->domain)); | |
1982 | cmd_result = LTTNG_ERR_FATAL; | |
1983 | goto end; | |
1984 | } | |
1985 | ||
1986 | end: | |
1987 | free(source_element); | |
1988 | *_cmd_result = cmd_result; | |
1989 | return ret; | |
1990 | } | |
1991 | ||
1992 | int handle_notification_thread_remove_tracer_event_source_no_result( | |
1993 | struct notification_thread_state *state, | |
1994 | int tracer_event_source_fd) | |
1995 | { | |
1996 | int ret; | |
1997 | enum lttng_error_code cmd_result; | |
1998 | ||
1999 | ret = handle_notification_thread_command_remove_tracer_event_source( | |
2000 | state, tracer_event_source_fd, &cmd_result); | |
2001 | (void) cmd_result; | |
2002 | return ret; | |
2003 | } | |
2004 | ||
fbc9f37d JR |
2005 | static int handle_notification_thread_command_list_triggers( |
2006 | struct notification_thread_handle *handle, | |
2007 | struct notification_thread_state *state, | |
2008 | uid_t client_uid, | |
2009 | struct lttng_triggers **triggers, | |
2010 | enum lttng_error_code *_cmd_result) | |
2011 | { | |
2012 | int ret = 0; | |
2013 | enum lttng_error_code cmd_result = LTTNG_OK; | |
2014 | struct cds_lfht_iter iter; | |
2015 | struct lttng_trigger_ht_element *trigger_ht_element; | |
2016 | struct lttng_triggers *local_triggers = NULL; | |
2017 | const struct lttng_credentials *creds; | |
2018 | ||
2019 | rcu_read_lock(); | |
2020 | ||
2021 | local_triggers = lttng_triggers_create(); | |
2022 | if (!local_triggers) { | |
2023 | /* Not a fatal error. */ | |
2024 | cmd_result = LTTNG_ERR_NOMEM; | |
2025 | goto end; | |
2026 | } | |
2027 | ||
2028 | cds_lfht_for_each_entry(state->triggers_ht, &iter, | |
2029 | trigger_ht_element, node) { | |
2030 | /* | |
2031 | * Only return the triggers to which the client has access. | |
2032 | * The root user has visibility over all triggers. | |
2033 | */ | |
2034 | creds = lttng_trigger_get_credentials(trigger_ht_element->trigger); | |
2035 | if (client_uid != lttng_credentials_get_uid(creds) && client_uid != 0) { | |
2036 | continue; | |
2037 | } | |
2038 | ||
2039 | ret = lttng_triggers_add(local_triggers, | |
2040 | trigger_ht_element->trigger); | |
2041 | if (ret < 0) { | |
2042 | /* Not a fatal error. */ | |
2043 | ret = 0; | |
2044 | cmd_result = LTTNG_ERR_NOMEM; | |
2045 | goto end; | |
2046 | } | |
2047 | } | |
2048 | ||
2049 | /* Transferring ownership to the caller. */ | |
2050 | *triggers = local_triggers; | |
2051 | local_triggers = NULL; | |
2052 | ||
2053 | end: | |
2054 | rcu_read_unlock(); | |
2055 | lttng_triggers_destroy(local_triggers); | |
2056 | *_cmd_result = cmd_result; | |
2057 | return ret; | |
2058 | } | |
2059 | ||
1da26331 | 2060 | static |
959e3c66 | 2061 | bool condition_is_supported(struct lttng_condition *condition) |
1da26331 | 2062 | { |
959e3c66 | 2063 | bool is_supported; |
1da26331 JG |
2064 | |
2065 | switch (lttng_condition_get_type(condition)) { | |
2066 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
2067 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
2068 | { | |
959e3c66 | 2069 | int ret; |
1da26331 JG |
2070 | enum lttng_domain_type domain; |
2071 | ||
2072 | ret = lttng_condition_buffer_usage_get_domain_type(condition, | |
2073 | &domain); | |
959e3c66 | 2074 | assert(ret == 0); |
1da26331 JG |
2075 | |
2076 | if (domain != LTTNG_DOMAIN_KERNEL) { | |
959e3c66 | 2077 | is_supported = true; |
1da26331 JG |
2078 | goto end; |
2079 | } | |
2080 | ||
2081 | /* | |
2082 | * Older kernel tracers don't expose the API to monitor their | |
2083 | * buffers. Therefore, we reject triggers that require that | |
2084 | * mechanism to be available to be evaluated. | |
959e3c66 JR |
2085 | * |
2086 | * Assume unsupported on error. | |
1da26331 | 2087 | */ |
959e3c66 JR |
2088 | is_supported = kernel_supports_ring_buffer_snapshot_sample_positions() == 1; |
2089 | break; | |
2090 | } | |
2091 | case LTTNG_CONDITION_TYPE_EVENT_RULE_HIT: | |
2092 | { | |
2093 | const struct lttng_event_rule *event_rule; | |
2094 | enum lttng_domain_type domain; | |
2095 | const enum lttng_condition_status status = | |
2096 | lttng_condition_event_rule_get_rule( | |
2097 | condition, &event_rule); | |
2098 | ||
2099 | assert(status == LTTNG_CONDITION_STATUS_OK); | |
2100 | ||
2101 | domain = lttng_event_rule_get_domain_type(event_rule); | |
2102 | if (domain != LTTNG_DOMAIN_KERNEL) { | |
2103 | is_supported = true; | |
2104 | goto end; | |
2105 | } | |
2106 | ||
2107 | /* | |
2108 | * Older kernel tracers can't emit notification. Therefore, we | |
2109 | * reject triggers that require that mechanism to be available | |
2110 | * to be evaluated. | |
2111 | * | |
2112 | * Assume unsupported on error. | |
2113 | */ | |
2114 | is_supported = kernel_supports_event_notifiers() == 1; | |
1da26331 JG |
2115 | break; |
2116 | } | |
2117 | default: | |
959e3c66 | 2118 | is_supported = true; |
1da26331 JG |
2119 | } |
2120 | end: | |
959e3c66 | 2121 | return is_supported; |
1da26331 JG |
2122 | } |
2123 | ||
51eab943 JG |
2124 | /* Must be called with RCU read lock held. */ |
2125 | static | |
f2b3ef9f | 2126 | int bind_trigger_to_matching_session(struct lttng_trigger *trigger, |
51eab943 JG |
2127 | struct notification_thread_state *state) |
2128 | { | |
2129 | int ret = 0; | |
51eab943 JG |
2130 | const struct lttng_condition *condition; |
2131 | const char *session_name; | |
2132 | struct lttng_session_trigger_list *trigger_list; | |
2133 | ||
2134 | condition = lttng_trigger_get_const_condition(trigger); | |
2135 | switch (lttng_condition_get_type(condition)) { | |
2136 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
2137 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
2138 | { | |
2139 | enum lttng_condition_status status; | |
2140 | ||
2141 | status = lttng_condition_session_rotation_get_session_name( | |
2142 | condition, &session_name); | |
2143 | if (status != LTTNG_CONDITION_STATUS_OK) { | |
2144 | ERR("[notification-thread] Failed to bind trigger to session: unable to get 'session_rotation' condition's session name"); | |
2145 | ret = -1; | |
2146 | goto end; | |
2147 | } | |
2148 | break; | |
2149 | } | |
2150 | default: | |
2151 | ret = -1; | |
2152 | goto end; | |
2153 | } | |
2154 | ||
ed327204 JG |
2155 | trigger_list = get_session_trigger_list(state, session_name); |
2156 | if (!trigger_list) { | |
51eab943 JG |
2157 | DBG("[notification-thread] Unable to bind trigger applying to session \"%s\" as it is not yet known to the notification system", |
2158 | session_name); | |
2159 | goto end; | |
51eab943 | 2160 | |
ed327204 | 2161 | } |
51eab943 JG |
2162 | |
2163 | DBG("[notification-thread] Newly registered trigger bound to session \"%s\"", | |
2164 | session_name); | |
2165 | ret = lttng_session_trigger_list_add(trigger_list, trigger); | |
2166 | end: | |
2167 | return ret; | |
2168 | } | |
2169 | ||
2170 | /* Must be called with RCU read lock held. */ | |
2171 | static | |
f2b3ef9f | 2172 | int bind_trigger_to_matching_channels(struct lttng_trigger *trigger, |
51eab943 JG |
2173 | struct notification_thread_state *state) |
2174 | { | |
2175 | int ret = 0; | |
2176 | struct cds_lfht_node *node; | |
2177 | struct cds_lfht_iter iter; | |
2178 | struct channel_info *channel; | |
2179 | ||
2180 | cds_lfht_for_each_entry(state->channels_ht, &iter, channel, | |
2181 | channels_ht_node) { | |
2182 | struct lttng_trigger_list_element *trigger_list_element; | |
2183 | struct lttng_channel_trigger_list *trigger_list; | |
a5d64ae7 | 2184 | struct cds_lfht_iter lookup_iter; |
51eab943 JG |
2185 | |
2186 | if (!trigger_applies_to_channel(trigger, channel)) { | |
2187 | continue; | |
2188 | } | |
2189 | ||
2190 | cds_lfht_lookup(state->channel_triggers_ht, | |
2191 | hash_channel_key(&channel->key), | |
2192 | match_channel_trigger_list, | |
2193 | &channel->key, | |
a5d64ae7 MD |
2194 | &lookup_iter); |
2195 | node = cds_lfht_iter_get_node(&lookup_iter); | |
51eab943 JG |
2196 | assert(node); |
2197 | trigger_list = caa_container_of(node, | |
2198 | struct lttng_channel_trigger_list, | |
2199 | channel_triggers_ht_node); | |
2200 | ||
2201 | trigger_list_element = zmalloc(sizeof(*trigger_list_element)); | |
2202 | if (!trigger_list_element) { | |
2203 | ret = -1; | |
2204 | goto end; | |
2205 | } | |
2206 | CDS_INIT_LIST_HEAD(&trigger_list_element->node); | |
2207 | trigger_list_element->trigger = trigger; | |
2208 | cds_list_add(&trigger_list_element->node, &trigger_list->list); | |
2209 | DBG("[notification-thread] Newly registered trigger bound to channel \"%s\"", | |
2210 | channel->name); | |
2211 | } | |
2212 | end: | |
2213 | return ret; | |
2214 | } | |
2215 | ||
f2b3ef9f JG |
2216 | static |
2217 | bool is_trigger_action_notify(const struct lttng_trigger *trigger) | |
2218 | { | |
2219 | bool is_notify = false; | |
2220 | unsigned int i, count; | |
2221 | enum lttng_action_status action_status; | |
2222 | const struct lttng_action *action = | |
2223 | lttng_trigger_get_const_action(trigger); | |
2224 | enum lttng_action_type action_type; | |
2225 | ||
2226 | assert(action); | |
17182cfd | 2227 | action_type = lttng_action_get_type(action); |
f2b3ef9f JG |
2228 | if (action_type == LTTNG_ACTION_TYPE_NOTIFY) { |
2229 | is_notify = true; | |
2230 | goto end; | |
2231 | } else if (action_type != LTTNG_ACTION_TYPE_GROUP) { | |
2232 | goto end; | |
2233 | } | |
2234 | ||
2235 | action_status = lttng_action_group_get_count(action, &count); | |
2236 | assert(action_status == LTTNG_ACTION_STATUS_OK); | |
2237 | ||
2238 | for (i = 0; i < count; i++) { | |
2239 | const struct lttng_action *inner_action = | |
2240 | lttng_action_group_get_at_index( | |
2241 | action, i); | |
2242 | ||
17182cfd | 2243 | action_type = lttng_action_get_type(inner_action); |
f2b3ef9f JG |
2244 | if (action_type == LTTNG_ACTION_TYPE_NOTIFY) { |
2245 | is_notify = true; | |
2246 | goto end; | |
2247 | } | |
2248 | } | |
2249 | ||
2250 | end: | |
2251 | return is_notify; | |
2252 | } | |
2253 | ||
242388e4 JR |
2254 | static bool trigger_name_taken(struct notification_thread_state *state, |
2255 | const struct lttng_trigger *trigger) | |
2256 | { | |
2257 | struct cds_lfht_iter iter; | |
2258 | ||
2259 | /* | |
2260 | * No duplicata is allowed in the triggers_by_name_uid_ht. | |
2261 | * The match is done against the trigger name and uid. | |
2262 | */ | |
2263 | cds_lfht_lookup(state->triggers_by_name_uid_ht, | |
2264 | hash_trigger_by_name_uid(trigger), | |
2265 | match_trigger_by_name_uid, | |
2266 | trigger, | |
2267 | &iter); | |
2268 | return !!cds_lfht_iter_get_node(&iter); | |
2269 | } | |
2270 | ||
2271 | static | |
2272 | enum lttng_error_code generate_trigger_name( | |
2273 | struct notification_thread_state *state, | |
2274 | struct lttng_trigger *trigger, const char **name) | |
2275 | { | |
2276 | enum lttng_error_code ret_code = LTTNG_OK; | |
2277 | bool taken = false; | |
2278 | enum lttng_trigger_status status; | |
2279 | ||
2280 | do { | |
2281 | const int ret = lttng_trigger_generate_name(trigger, | |
2282 | state->trigger_id.name_offset++); | |
2283 | if (ret) { | |
2284 | /* The only reason this can fail right now. */ | |
2285 | ret_code = LTTNG_ERR_NOMEM; | |
2286 | break; | |
2287 | } | |
2288 | ||
2289 | status = lttng_trigger_get_name(trigger, name); | |
2290 | assert(status == LTTNG_TRIGGER_STATUS_OK); | |
2291 | ||
2292 | taken = trigger_name_taken(state, trigger); | |
2293 | } while (taken || state->trigger_id.name_offset == UINT64_MAX); | |
2294 | ||
2295 | return ret_code; | |
2296 | } | |
2297 | ||
ab0ee2ca | 2298 | /* |
f2b3ef9f | 2299 | * FIXME A client's credentials are not checked when registering a trigger. |
ab0ee2ca | 2300 | * |
1da26331 | 2301 | * The effects of this are benign since: |
ab0ee2ca | 2302 | * - The client will succeed in registering the trigger, as it is valid, |
51eab943 | 2303 | * - The trigger will, internally, be bound to the channel/session, |
ab0ee2ca JG |
2304 | * - The notifications will not be sent since the client's credentials |
2305 | * are checked against the channel at that moment. | |
1da26331 JG |
2306 | * |
2307 | * If this function returns a non-zero value, it means something is | |
50ca7858 | 2308 | * fundamentally broken and the whole subsystem/thread will be torn down. |
1da26331 JG |
2309 | * |
2310 | * If a non-fatal error occurs, just set the cmd_result to the appropriate | |
2311 | * error code. | |
ab0ee2ca JG |
2312 | */ |
2313 | static | |
2314 | int handle_notification_thread_command_register_trigger( | |
8abe313a JG |
2315 | struct notification_thread_state *state, |
2316 | struct lttng_trigger *trigger, | |
2317 | enum lttng_error_code *cmd_result) | |
ab0ee2ca JG |
2318 | { |
2319 | int ret = 0; | |
2320 | struct lttng_condition *condition; | |
2321 | struct notification_client *client; | |
2322 | struct notification_client_list *client_list = NULL; | |
2323 | struct lttng_trigger_ht_element *trigger_ht_element = NULL; | |
f2b3ef9f | 2324 | struct notification_client_list_element *client_list_element; |
ab0ee2ca JG |
2325 | struct cds_lfht_node *node; |
2326 | struct cds_lfht_iter iter; | |
242388e4 | 2327 | const char* trigger_name; |
ab0ee2ca | 2328 | bool free_trigger = true; |
f2b3ef9f JG |
2329 | struct lttng_evaluation *evaluation = NULL; |
2330 | struct lttng_credentials object_creds; | |
ff588497 JR |
2331 | uid_t object_uid; |
2332 | gid_t object_gid; | |
f2b3ef9f | 2333 | enum action_executor_status executor_status; |
e6887944 JR |
2334 | const uint64_t trigger_tracer_token = |
2335 | state->trigger_id.next_tracer_token++; | |
ab0ee2ca JG |
2336 | |
2337 | rcu_read_lock(); | |
2338 | ||
e6887944 JR |
2339 | /* Set the trigger's tracer token. */ |
2340 | lttng_trigger_set_tracer_token(trigger, trigger_tracer_token); | |
2341 | ||
242388e4 JR |
2342 | if (lttng_trigger_get_name(trigger, &trigger_name) == |
2343 | LTTNG_TRIGGER_STATUS_UNSET) { | |
2344 | const enum lttng_error_code ret_code = generate_trigger_name( | |
2345 | state, trigger, &trigger_name); | |
2346 | ||
2347 | if (ret_code != LTTNG_OK) { | |
2348 | /* Fatal error. */ | |
2349 | ret = -1; | |
2350 | *cmd_result = ret_code; | |
2351 | goto error; | |
2352 | } | |
2353 | } else if (trigger_name_taken(state, trigger)) { | |
2354 | /* Not a fatal error. */ | |
2355 | *cmd_result = LTTNG_ERR_TRIGGER_EXISTS; | |
2356 | ret = 0; | |
2357 | goto error; | |
2358 | } | |
2359 | ||
ab0ee2ca | 2360 | condition = lttng_trigger_get_condition(trigger); |
1da26331 JG |
2361 | assert(condition); |
2362 | ||
959e3c66 JR |
2363 | /* Some conditions require tracers to implement a minimal ABI version. */ |
2364 | if (!condition_is_supported(condition)) { | |
1da26331 JG |
2365 | *cmd_result = LTTNG_ERR_NOT_SUPPORTED; |
2366 | goto error; | |
1da26331 JG |
2367 | } |
2368 | ||
ab0ee2ca JG |
2369 | trigger_ht_element = zmalloc(sizeof(*trigger_ht_element)); |
2370 | if (!trigger_ht_element) { | |
2371 | ret = -1; | |
2372 | goto error; | |
2373 | } | |
2374 | ||
2375 | /* Add trigger to the trigger_ht. */ | |
2376 | cds_lfht_node_init(&trigger_ht_element->node); | |
242388e4 | 2377 | cds_lfht_node_init(&trigger_ht_element->node_by_name_uid); |
ab0ee2ca JG |
2378 | trigger_ht_element->trigger = trigger; |
2379 | ||
2380 | node = cds_lfht_add_unique(state->triggers_ht, | |
2381 | lttng_condition_hash(condition), | |
242388e4 JR |
2382 | match_trigger, |
2383 | trigger, | |
ab0ee2ca JG |
2384 | &trigger_ht_element->node); |
2385 | if (node != &trigger_ht_element->node) { | |
2386 | /* Not a fatal error, simply report it to the client. */ | |
2387 | *cmd_result = LTTNG_ERR_TRIGGER_EXISTS; | |
2388 | goto error_free_ht_element; | |
2389 | } | |
2390 | ||
242388e4 JR |
2391 | node = cds_lfht_add_unique(state->triggers_by_name_uid_ht, |
2392 | hash_trigger_by_name_uid(trigger), | |
2393 | match_trigger_by_name_uid, | |
2394 | trigger, | |
2395 | &trigger_ht_element->node_by_name_uid); | |
2396 | if (node != &trigger_ht_element->node_by_name_uid) { | |
2397 | /* Not a fatal error, simply report it to the client. */ | |
2398 | cds_lfht_del(state->triggers_ht, &trigger_ht_element->node); | |
2399 | *cmd_result = LTTNG_ERR_TRIGGER_EXISTS; | |
2400 | goto error_free_ht_element; | |
2401 | } | |
2402 | ||
ab0ee2ca JG |
2403 | /* |
2404 | * Ownership of the trigger and of its wrapper was transfered to | |
2405 | * the triggers_ht. | |
2406 | */ | |
2407 | trigger_ht_element = NULL; | |
2408 | free_trigger = false; | |
2409 | ||
2410 | /* | |
2411 | * The rest only applies to triggers that have a "notify" action. | |
2412 | * It is not skipped as this is the only action type currently | |
2413 | * supported. | |
2414 | */ | |
f2b3ef9f JG |
2415 | if (is_trigger_action_notify(trigger)) { |
2416 | client_list = notification_client_list_create(trigger); | |
2417 | if (!client_list) { | |
2418 | ret = -1; | |
2419 | goto error_free_ht_element; | |
ab0ee2ca JG |
2420 | } |
2421 | ||
f2b3ef9f JG |
2422 | /* Build a list of clients to which this new trigger applies. */ |
2423 | cds_lfht_for_each_entry (state->client_socket_ht, &iter, client, | |
2424 | client_socket_ht_node) { | |
2425 | if (!trigger_applies_to_client(trigger, client)) { | |
2426 | continue; | |
2427 | } | |
2428 | ||
2429 | client_list_element = | |
2430 | zmalloc(sizeof(*client_list_element)); | |
2431 | if (!client_list_element) { | |
2432 | ret = -1; | |
2433 | goto error_put_client_list; | |
2434 | } | |
2435 | ||
2436 | CDS_INIT_LIST_HEAD(&client_list_element->node); | |
2437 | client_list_element->client = client; | |
2438 | cds_list_add(&client_list_element->node, | |
2439 | &client_list->list); | |
ab0ee2ca | 2440 | } |
f2b3ef9f JG |
2441 | |
2442 | /* | |
2443 | * Client list ownership transferred to the | |
2444 | * notification_trigger_clients_ht. | |
2445 | */ | |
2446 | publish_notification_client_list(state, client_list); | |
ab0ee2ca JG |
2447 | } |
2448 | ||
f82f93a1 | 2449 | switch (get_condition_binding_object(condition)) { |
51eab943 JG |
2450 | case LTTNG_OBJECT_TYPE_SESSION: |
2451 | /* Add the trigger to the list if it matches a known session. */ | |
2452 | ret = bind_trigger_to_matching_session(trigger, state); | |
2453 | if (ret) { | |
505b2d90 | 2454 | goto error_put_client_list; |
ab0ee2ca | 2455 | } |
f82f93a1 | 2456 | break; |
51eab943 JG |
2457 | case LTTNG_OBJECT_TYPE_CHANNEL: |
2458 | /* | |
2459 | * Add the trigger to list of triggers bound to the channels | |
2460 | * currently known. | |
2461 | */ | |
2462 | ret = bind_trigger_to_matching_channels(trigger, state); | |
2463 | if (ret) { | |
505b2d90 | 2464 | goto error_put_client_list; |
ab0ee2ca | 2465 | } |
51eab943 JG |
2466 | break; |
2467 | case LTTNG_OBJECT_TYPE_NONE: | |
2468 | break; | |
2469 | default: | |
f2b3ef9f | 2470 | ERR("Unknown object type on which to bind a newly registered trigger was encountered"); |
51eab943 | 2471 | ret = -1; |
505b2d90 | 2472 | goto error_put_client_list; |
ab0ee2ca JG |
2473 | } |
2474 | ||
2ae99f0b | 2475 | /* |
f2b3ef9f JG |
2476 | * The new trigger's condition must be evaluated against the current |
2477 | * state. | |
2478 | * | |
2479 | * In the case of `notify` action, nothing preventing clients from | |
2480 | * subscribing to a condition before the corresponding trigger is | |
2481 | * registered, we have to evaluate this new condition right away. | |
2ae99f0b JG |
2482 | * |
2483 | * At some point, we were waiting for the next "evaluation" (e.g. on | |
2484 | * reception of a channel sample) to evaluate this new condition, but | |
2485 | * that was broken. | |
2486 | * | |
2487 | * The reason it was broken is that waiting for the next sample | |
2488 | * does not allow us to properly handle transitions for edge-triggered | |
2489 | * conditions. | |
2490 | * | |
2491 | * Consider this example: when we handle a new channel sample, we | |
2492 | * evaluate each conditions twice: once with the previous state, and | |
2493 | * again with the newest state. We then use those two results to | |
2494 | * determine whether a state change happened: a condition was false and | |
2495 | * became true. If a state change happened, we have to notify clients. | |
2496 | * | |
2497 | * Now, if a client subscribes to a given notification and registers | |
2498 | * a trigger *after* that subscription, we have to make sure the | |
2499 | * condition is evaluated at this point while considering only the | |
2500 | * current state. Otherwise, the next evaluation cycle may only see | |
2501 | * that the evaluations remain the same (true for samples n-1 and n) and | |
2502 | * the client will never know that the condition has been met. | |
2503 | */ | |
f2b3ef9f JG |
2504 | switch (get_condition_binding_object(condition)) { |
2505 | case LTTNG_OBJECT_TYPE_SESSION: | |
2506 | ret = evaluate_session_condition_for_client(condition, state, | |
ff588497 JR |
2507 | &evaluation, &object_uid, |
2508 | &object_gid); | |
f2b3ef9f JG |
2509 | break; |
2510 | case LTTNG_OBJECT_TYPE_CHANNEL: | |
2511 | ret = evaluate_channel_condition_for_client(condition, state, | |
ff588497 JR |
2512 | &evaluation, &object_uid, |
2513 | &object_gid); | |
f2b3ef9f JG |
2514 | break; |
2515 | case LTTNG_OBJECT_TYPE_NONE: | |
2516 | ret = 0; | |
242388e4 | 2517 | break; |
f2b3ef9f JG |
2518 | case LTTNG_OBJECT_TYPE_UNKNOWN: |
2519 | default: | |
2520 | ret = -1; | |
242388e4 | 2521 | break; |
f2b3ef9f JG |
2522 | } |
2523 | ||
2524 | if (ret) { | |
2525 | /* Fatal error. */ | |
2526 | goto error_put_client_list; | |
2527 | } | |
2528 | ||
ff588497 JR |
2529 | LTTNG_OPTIONAL_SET(&object_creds.uid, object_uid); |
2530 | LTTNG_OPTIONAL_SET(&object_creds.gid, object_gid); | |
2531 | ||
f2b3ef9f JG |
2532 | DBG("Newly registered trigger's condition evaluated to %s", |
2533 | evaluation ? "true" : "false"); | |
2534 | if (!evaluation) { | |
2535 | /* Evaluation yielded nothing. Normal exit. */ | |
2536 | ret = 0; | |
242388e4 | 2537 | goto end; |
2ae99f0b JG |
2538 | } |
2539 | ||
2540 | /* | |
f2b3ef9f JG |
2541 | * Ownership of `evaluation` transferred to the action executor |
2542 | * no matter the result. | |
2ae99f0b | 2543 | */ |
f2b3ef9f JG |
2544 | executor_status = action_executor_enqueue(state->executor, trigger, |
2545 | evaluation, &object_creds, client_list); | |
2546 | evaluation = NULL; | |
2547 | switch (executor_status) { | |
2548 | case ACTION_EXECUTOR_STATUS_OK: | |
2549 | break; | |
2550 | case ACTION_EXECUTOR_STATUS_ERROR: | |
2551 | case ACTION_EXECUTOR_STATUS_INVALID: | |
2552 | /* | |
2553 | * TODO Add trigger identification (name/id) when | |
2554 | * it is added to the API. | |
2555 | */ | |
2556 | ERR("Fatal error occurred while enqueuing action associated to newly registered trigger"); | |
2557 | ret = -1; | |
2558 | goto error_put_client_list; | |
2559 | case ACTION_EXECUTOR_STATUS_OVERFLOW: | |
2560 | /* | |
2561 | * TODO Add trigger identification (name/id) when | |
2562 | * it is added to the API. | |
2563 | * | |
2564 | * Not a fatal error. | |
2565 | */ | |
2566 | WARN("No space left when enqueuing action associated to newly registered trigger"); | |
2567 | ret = 0; | |
242388e4 | 2568 | goto end; |
f2b3ef9f JG |
2569 | default: |
2570 | abort(); | |
2571 | } | |
2ae99f0b | 2572 | |
242388e4 | 2573 | end: |
ab0ee2ca | 2574 | *cmd_result = LTTNG_OK; |
e6887944 JR |
2575 | DBG("Registered trigger: name = `%s`, tracer token = %" PRIu64, |
2576 | trigger_name, trigger_tracer_token); | |
505b2d90 JG |
2577 | |
2578 | error_put_client_list: | |
2579 | notification_client_list_put(client_list); | |
2580 | ||
ab0ee2ca | 2581 | error_free_ht_element: |
242388e4 JR |
2582 | if (trigger_ht_element) { |
2583 | /* Delayed removal due to RCU constraint on delete. */ | |
2584 | call_rcu(&trigger_ht_element->rcu_node, | |
2585 | free_lttng_trigger_ht_element_rcu); | |
2586 | } | |
2587 | ||
ab0ee2ca JG |
2588 | error: |
2589 | if (free_trigger) { | |
ab0ee2ca JG |
2590 | lttng_trigger_destroy(trigger); |
2591 | } | |
2592 | rcu_read_unlock(); | |
2593 | return ret; | |
2594 | } | |
2595 | ||
83b934ad MD |
2596 | static |
2597 | void free_lttng_trigger_ht_element_rcu(struct rcu_head *node) | |
2598 | { | |
2599 | free(caa_container_of(node, struct lttng_trigger_ht_element, | |
2600 | rcu_node)); | |
2601 | } | |
2602 | ||
cc2295b5 | 2603 | static |
ab0ee2ca JG |
2604 | int handle_notification_thread_command_unregister_trigger( |
2605 | struct notification_thread_state *state, | |
2606 | struct lttng_trigger *trigger, | |
2607 | enum lttng_error_code *_cmd_reply) | |
2608 | { | |
2609 | struct cds_lfht_iter iter; | |
ed327204 | 2610 | struct cds_lfht_node *triggers_ht_node; |
ab0ee2ca JG |
2611 | struct lttng_channel_trigger_list *trigger_list; |
2612 | struct notification_client_list *client_list; | |
ab0ee2ca JG |
2613 | struct lttng_trigger_ht_element *trigger_ht_element = NULL; |
2614 | struct lttng_condition *condition = lttng_trigger_get_condition( | |
2615 | trigger); | |
ab0ee2ca JG |
2616 | enum lttng_error_code cmd_reply; |
2617 | ||
2618 | rcu_read_lock(); | |
2619 | ||
2620 | cds_lfht_lookup(state->triggers_ht, | |
2621 | lttng_condition_hash(condition), | |
242388e4 JR |
2622 | match_trigger, |
2623 | trigger, | |
ab0ee2ca JG |
2624 | &iter); |
2625 | triggers_ht_node = cds_lfht_iter_get_node(&iter); | |
2626 | if (!triggers_ht_node) { | |
2627 | cmd_reply = LTTNG_ERR_TRIGGER_NOT_FOUND; | |
2628 | goto end; | |
2629 | } else { | |
2630 | cmd_reply = LTTNG_OK; | |
2631 | } | |
2632 | ||
2633 | /* Remove trigger from channel_triggers_ht. */ | |
2634 | cds_lfht_for_each_entry(state->channel_triggers_ht, &iter, trigger_list, | |
2635 | channel_triggers_ht_node) { | |
2636 | struct lttng_trigger_list_element *trigger_element, *tmp; | |
2637 | ||
2638 | cds_list_for_each_entry_safe(trigger_element, tmp, | |
2639 | &trigger_list->list, node) { | |
e8f7fa11 | 2640 | if (!lttng_trigger_is_equal(trigger, trigger_element->trigger)) { |
ab0ee2ca JG |
2641 | continue; |
2642 | } | |
2643 | ||
2644 | DBG("[notification-thread] Removed trigger from channel_triggers_ht"); | |
2645 | cds_list_del(&trigger_element->node); | |
e4db5ace JR |
2646 | /* A trigger can only appear once per channel */ |
2647 | break; | |
ab0ee2ca JG |
2648 | } |
2649 | } | |
2650 | ||
51367634 JR |
2651 | if (is_trigger_action_notify(trigger)) { |
2652 | /* | |
2653 | * Remove and release the client list from | |
2654 | * notification_trigger_clients_ht. | |
2655 | */ | |
2656 | client_list = get_client_list_from_condition(state, condition); | |
2657 | assert(client_list); | |
ed327204 | 2658 | |
51367634 JR |
2659 | /* Put new reference and the hashtable's reference. */ |
2660 | notification_client_list_put(client_list); | |
2661 | notification_client_list_put(client_list); | |
2662 | client_list = NULL; | |
2663 | } | |
ab0ee2ca JG |
2664 | |
2665 | /* Remove trigger from triggers_ht. */ | |
2666 | trigger_ht_element = caa_container_of(triggers_ht_node, | |
2667 | struct lttng_trigger_ht_element, node); | |
242388e4 | 2668 | cds_lfht_del(state->triggers_by_name_uid_ht, &trigger_ht_element->node_by_name_uid); |
ab0ee2ca JG |
2669 | cds_lfht_del(state->triggers_ht, triggers_ht_node); |
2670 | ||
7ca172c1 | 2671 | /* Release the ownership of the trigger. */ |
ab0ee2ca | 2672 | lttng_trigger_destroy(trigger_ht_element->trigger); |
83b934ad | 2673 | call_rcu(&trigger_ht_element->rcu_node, free_lttng_trigger_ht_element_rcu); |
ab0ee2ca JG |
2674 | end: |
2675 | rcu_read_unlock(); | |
2676 | if (_cmd_reply) { | |
2677 | *_cmd_reply = cmd_reply; | |
2678 | } | |
2679 | return 0; | |
2680 | } | |
2681 | ||
2682 | /* Returns 0 on success, 1 on exit requested, negative value on error. */ | |
2683 | int handle_notification_thread_command( | |
2684 | struct notification_thread_handle *handle, | |
2685 | struct notification_thread_state *state) | |
2686 | { | |
2687 | int ret; | |
2688 | uint64_t counter; | |
2689 | struct notification_thread_command *cmd; | |
2690 | ||
8abe313a | 2691 | /* Read the event pipe to put it back into a quiescent state. */ |
18aeca05 | 2692 | ret = lttng_read(lttng_pipe_get_readfd(handle->cmd_queue.event_pipe), &counter, |
8abe313a | 2693 | sizeof(counter)); |
18aeca05 | 2694 | if (ret != sizeof(counter)) { |
ab0ee2ca JG |
2695 | goto error; |
2696 | } | |
2697 | ||
2698 | pthread_mutex_lock(&handle->cmd_queue.lock); | |
2699 | cmd = cds_list_first_entry(&handle->cmd_queue.list, | |
2700 | struct notification_thread_command, cmd_list_node); | |
97a71ea6 JR |
2701 | cds_list_del(&cmd->cmd_list_node); |
2702 | pthread_mutex_unlock(&handle->cmd_queue.lock); | |
ab0ee2ca JG |
2703 | switch (cmd->type) { |
2704 | case NOTIFICATION_COMMAND_TYPE_REGISTER_TRIGGER: | |
2705 | DBG("[notification-thread] Received register trigger command"); | |
2706 | ret = handle_notification_thread_command_register_trigger( | |
2707 | state, cmd->parameters.trigger, | |
2708 | &cmd->reply_code); | |
2709 | break; | |
2710 | case NOTIFICATION_COMMAND_TYPE_UNREGISTER_TRIGGER: | |
2711 | DBG("[notification-thread] Received unregister trigger command"); | |
2712 | ret = handle_notification_thread_command_unregister_trigger( | |
2713 | state, cmd->parameters.trigger, | |
2714 | &cmd->reply_code); | |
2715 | break; | |
2716 | case NOTIFICATION_COMMAND_TYPE_ADD_CHANNEL: | |
2717 | DBG("[notification-thread] Received add channel command"); | |
2718 | ret = handle_notification_thread_command_add_channel( | |
8abe313a JG |
2719 | state, |
2720 | cmd->parameters.add_channel.session.name, | |
2721 | cmd->parameters.add_channel.session.uid, | |
2722 | cmd->parameters.add_channel.session.gid, | |
2723 | cmd->parameters.add_channel.channel.name, | |
2724 | cmd->parameters.add_channel.channel.domain, | |
2725 | cmd->parameters.add_channel.channel.key, | |
2726 | cmd->parameters.add_channel.channel.capacity, | |
ab0ee2ca JG |
2727 | &cmd->reply_code); |
2728 | break; | |
2729 | case NOTIFICATION_COMMAND_TYPE_REMOVE_CHANNEL: | |
2730 | DBG("[notification-thread] Received remove channel command"); | |
2731 | ret = handle_notification_thread_command_remove_channel( | |
2732 | state, cmd->parameters.remove_channel.key, | |
2733 | cmd->parameters.remove_channel.domain, | |
2734 | &cmd->reply_code); | |
2735 | break; | |
0ca52944 | 2736 | case NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING: |
0ca52944 | 2737 | case NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_COMPLETED: |
ed327204 JG |
2738 | DBG("[notification-thread] Received session rotation %s command", |
2739 | cmd->type == NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING ? | |
2740 | "ongoing" : "completed"); | |
2741 | ret = handle_notification_thread_command_session_rotation( | |
0ca52944 | 2742 | state, |
ed327204 JG |
2743 | cmd->type, |
2744 | cmd->parameters.session_rotation.session_name, | |
2745 | cmd->parameters.session_rotation.uid, | |
2746 | cmd->parameters.session_rotation.gid, | |
2747 | cmd->parameters.session_rotation.trace_archive_chunk_id, | |
2748 | cmd->parameters.session_rotation.location, | |
0ca52944 JG |
2749 | &cmd->reply_code); |
2750 | break; | |
d02d7404 JR |
2751 | case NOTIFICATION_COMMAND_TYPE_ADD_TRACER_EVENT_SOURCE: |
2752 | ret = handle_notification_thread_command_add_tracer_event_source( | |
2753 | state, | |
2754 | cmd->parameters.tracer_event_source.tracer_event_source_fd, | |
2755 | cmd->parameters.tracer_event_source.domain, | |
2756 | &cmd->reply_code); | |
2757 | break; | |
2758 | case NOTIFICATION_COMMAND_TYPE_REMOVE_TRACER_EVENT_SOURCE: | |
2759 | ret = handle_notification_thread_command_remove_tracer_event_source( | |
2760 | state, | |
2761 | cmd->parameters.tracer_event_source.tracer_event_source_fd, | |
2762 | &cmd->reply_code); | |
2763 | break; | |
fbc9f37d JR |
2764 | case NOTIFICATION_COMMAND_TYPE_LIST_TRIGGERS: |
2765 | { | |
2766 | struct lttng_triggers *triggers = NULL; | |
2767 | ||
2768 | ret = handle_notification_thread_command_list_triggers( | |
2769 | handle, | |
2770 | state, | |
2771 | cmd->parameters.list_triggers.uid, | |
2772 | &triggers, | |
2773 | &cmd->reply_code); | |
2774 | cmd->reply.list_triggers.triggers = triggers; | |
2775 | ret = 0; | |
2776 | break; | |
2777 | } | |
ab0ee2ca JG |
2778 | case NOTIFICATION_COMMAND_TYPE_QUIT: |
2779 | DBG("[notification-thread] Received quit command"); | |
2780 | cmd->reply_code = LTTNG_OK; | |
2781 | ret = 1; | |
2782 | goto end; | |
f2b3ef9f JG |
2783 | case NOTIFICATION_COMMAND_TYPE_CLIENT_COMMUNICATION_UPDATE: |
2784 | { | |
2785 | const enum client_transmission_status client_status = | |
2786 | cmd->parameters.client_communication_update | |
2787 | .status; | |
2788 | const notification_client_id client_id = | |
2789 | cmd->parameters.client_communication_update.id; | |
2790 | struct notification_client *client; | |
2791 | ||
2792 | rcu_read_lock(); | |
2793 | client = get_client_from_id(client_id, state); | |
2794 | ||
2795 | if (!client) { | |
2796 | /* | |
2797 | * Client error was probably already picked-up by the | |
2798 | * notification thread or it has disconnected | |
2799 | * gracefully while this command was queued. | |
2800 | */ | |
2801 | DBG("Failed to find notification client to update communication status, client id = %" PRIu64, | |
2802 | client_id); | |
2803 | ret = 0; | |
2804 | } else { | |
f2b3ef9f JG |
2805 | ret = client_handle_transmission_status( |
2806 | client, client_status, state); | |
f2b3ef9f JG |
2807 | } |
2808 | rcu_read_unlock(); | |
2809 | break; | |
2810 | } | |
ab0ee2ca JG |
2811 | default: |
2812 | ERR("[notification-thread] Unknown internal command received"); | |
2813 | goto error_unlock; | |
2814 | } | |
2815 | ||
2816 | if (ret) { | |
2817 | goto error_unlock; | |
2818 | } | |
2819 | end: | |
0ab399e0 JG |
2820 | if (cmd->is_async) { |
2821 | free(cmd); | |
2822 | cmd = NULL; | |
2823 | } else { | |
2824 | lttng_waiter_wake_up(&cmd->reply_waiter); | |
2825 | } | |
ab0ee2ca JG |
2826 | return ret; |
2827 | error_unlock: | |
2828 | /* Wake-up and return a fatal error to the calling thread. */ | |
8ada111f | 2829 | lttng_waiter_wake_up(&cmd->reply_waiter); |
ab0ee2ca JG |
2830 | cmd->reply_code = LTTNG_ERR_FATAL; |
2831 | error: | |
2832 | /* Indicate a fatal error to the caller. */ | |
2833 | return -1; | |
2834 | } | |
2835 | ||
ab0ee2ca JG |
2836 | static |
2837 | int socket_set_non_blocking(int socket) | |
2838 | { | |
2839 | int ret, flags; | |
2840 | ||
2841 | /* Set the pipe as non-blocking. */ | |
2842 | ret = fcntl(socket, F_GETFL, 0); | |
2843 | if (ret == -1) { | |
2844 | PERROR("fcntl get socket flags"); | |
2845 | goto end; | |
2846 | } | |
2847 | flags = ret; | |
2848 | ||
2849 | ret = fcntl(socket, F_SETFL, flags | O_NONBLOCK); | |
2850 | if (ret == -1) { | |
2851 | PERROR("fcntl set O_NONBLOCK socket flag"); | |
2852 | goto end; | |
2853 | } | |
2854 | DBG("Client socket (fd = %i) set as non-blocking", socket); | |
2855 | end: | |
2856 | return ret; | |
2857 | } | |
2858 | ||
2859 | static | |
14fa22f8 | 2860 | int client_reset_inbound_state(struct notification_client *client) |
ab0ee2ca JG |
2861 | { |
2862 | int ret; | |
2863 | ||
882093ee JR |
2864 | |
2865 | lttng_payload_clear(&client->communication.inbound.payload); | |
ab0ee2ca JG |
2866 | |
2867 | client->communication.inbound.bytes_to_receive = | |
2868 | sizeof(struct lttng_notification_channel_message); | |
2869 | client->communication.inbound.msg_type = | |
2870 | LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNKNOWN; | |
ab0ee2ca JG |
2871 | LTTNG_SOCK_SET_UID_CRED(&client->communication.inbound.creds, -1); |
2872 | LTTNG_SOCK_SET_GID_CRED(&client->communication.inbound.creds, -1); | |
14fa22f8 | 2873 | ret = lttng_dynamic_buffer_set_size( |
882093ee | 2874 | &client->communication.inbound.payload.buffer, |
14fa22f8 | 2875 | client->communication.inbound.bytes_to_receive); |
882093ee | 2876 | |
14fa22f8 | 2877 | return ret; |
ab0ee2ca JG |
2878 | } |
2879 | ||
2880 | int handle_notification_thread_client_connect( | |
2881 | struct notification_thread_state *state) | |
2882 | { | |
2883 | int ret; | |
2884 | struct notification_client *client; | |
2885 | ||
2886 | DBG("[notification-thread] Handling new notification channel client connection"); | |
2887 | ||
2888 | client = zmalloc(sizeof(*client)); | |
2889 | if (!client) { | |
2890 | /* Fatal error. */ | |
2891 | ret = -1; | |
2892 | goto error; | |
2893 | } | |
6c24d3fd | 2894 | |
505b2d90 | 2895 | pthread_mutex_init(&client->lock, NULL); |
ac1889bf | 2896 | client->id = state->next_notification_client_id++; |
ab0ee2ca | 2897 | CDS_INIT_LIST_HEAD(&client->condition_list); |
882093ee JR |
2898 | lttng_payload_init(&client->communication.inbound.payload); |
2899 | lttng_payload_init(&client->communication.outbound.payload); | |
01ea340e | 2900 | client->communication.inbound.expect_creds = true; |
505b2d90 | 2901 | |
14fa22f8 JG |
2902 | ret = client_reset_inbound_state(client); |
2903 | if (ret) { | |
2904 | ERR("[notification-thread] Failed to reset client communication's inbound state"); | |
e742b055 | 2905 | ret = 0; |
14fa22f8 JG |
2906 | goto error; |
2907 | } | |
ab0ee2ca JG |
2908 | |
2909 | ret = lttcomm_accept_unix_sock(state->notification_channel_socket); | |
2910 | if (ret < 0) { | |
2911 | ERR("[notification-thread] Failed to accept new notification channel client connection"); | |
2912 | ret = 0; | |
2913 | goto error; | |
2914 | } | |
2915 | ||
2916 | client->socket = ret; | |
2917 | ||
2918 | ret = socket_set_non_blocking(client->socket); | |
2919 | if (ret) { | |
2920 | ERR("[notification-thread] Failed to set new notification channel client connection socket as non-blocking"); | |
2921 | goto error; | |
2922 | } | |
2923 | ||
2924 | ret = lttcomm_setsockopt_creds_unix_sock(client->socket); | |
2925 | if (ret < 0) { | |
2926 | ERR("[notification-thread] Failed to set socket options on new notification channel client socket"); | |
2927 | ret = 0; | |
2928 | goto error; | |
2929 | } | |
2930 | ||
2931 | ret = lttng_poll_add(&state->events, client->socket, | |
2932 | LPOLLIN | LPOLLERR | | |
2933 | LPOLLHUP | LPOLLRDHUP); | |
2934 | if (ret < 0) { | |
2935 | ERR("[notification-thread] Failed to add notification channel client socket to poll set"); | |
2936 | ret = 0; | |
2937 | goto error; | |
2938 | } | |
2939 | DBG("[notification-thread] Added new notification channel client socket (%i) to poll set", | |
2940 | client->socket); | |
2941 | ||
ab0ee2ca JG |
2942 | rcu_read_lock(); |
2943 | cds_lfht_add(state->client_socket_ht, | |
2944 | hash_client_socket(client->socket), | |
2945 | &client->client_socket_ht_node); | |
ac1889bf JG |
2946 | cds_lfht_add(state->client_id_ht, |
2947 | hash_client_id(client->id), | |
2948 | &client->client_id_ht_node); | |
ab0ee2ca JG |
2949 | rcu_read_unlock(); |
2950 | ||
2951 | return ret; | |
6c24d3fd | 2952 | |
ab0ee2ca JG |
2953 | error: |
2954 | notification_client_destroy(client, state); | |
2955 | return ret; | |
2956 | } | |
2957 | ||
6c24d3fd JG |
2958 | /* |
2959 | * RCU read-lock must be held by the caller. | |
2960 | * Client lock must _not_ be held by the caller. | |
2961 | */ | |
505b2d90 JG |
2962 | static |
2963 | int notification_thread_client_disconnect( | |
2964 | struct notification_client *client, | |
ab0ee2ca | 2965 | struct notification_thread_state *state) |
505b2d90 JG |
2966 | { |
2967 | int ret; | |
2968 | struct lttng_condition_list_element *condition_list_element, *tmp; | |
2969 | ||
2970 | /* Acquire the client lock to disable its communication atomically. */ | |
6c24d3fd | 2971 | pthread_mutex_lock(&client->lock); |
505b2d90 | 2972 | client->communication.active = false; |
6c24d3fd JG |
2973 | cds_lfht_del(state->client_socket_ht, &client->client_socket_ht_node); |
2974 | cds_lfht_del(state->client_id_ht, &client->client_id_ht_node); | |
2975 | pthread_mutex_unlock(&client->lock); | |
2976 | ||
505b2d90 JG |
2977 | ret = lttng_poll_del(&state->events, client->socket); |
2978 | if (ret) { | |
2979 | ERR("[notification-thread] Failed to remove client socket %d from poll set", | |
2980 | client->socket); | |
2981 | } | |
2982 | ||
505b2d90 JG |
2983 | /* Release all conditions to which the client was subscribed. */ |
2984 | cds_list_for_each_entry_safe(condition_list_element, tmp, | |
2985 | &client->condition_list, node) { | |
2986 | (void) notification_thread_client_unsubscribe(client, | |
2987 | condition_list_element->condition, state, NULL); | |
2988 | } | |
2989 | ||
2990 | /* | |
2991 | * Client no longer accessible to other threads (through the | |
2992 | * client lists). | |
2993 | */ | |
2994 | notification_client_destroy(client, state); | |
2995 | return ret; | |
2996 | } | |
2997 | ||
2998 | int handle_notification_thread_client_disconnect( | |
2999 | int client_socket, struct notification_thread_state *state) | |
ab0ee2ca JG |
3000 | { |
3001 | int ret = 0; | |
3002 | struct notification_client *client; | |
3003 | ||
3004 | rcu_read_lock(); | |
3005 | DBG("[notification-thread] Closing client connection (socket fd = %i)", | |
3006 | client_socket); | |
3007 | client = get_client_from_socket(client_socket, state); | |
3008 | if (!client) { | |
3009 | /* Internal state corruption, fatal error. */ | |
3010 | ERR("[notification-thread] Unable to find client (socket fd = %i)", | |
3011 | client_socket); | |
3012 | ret = -1; | |
3013 | goto end; | |
3014 | } | |
3015 | ||
505b2d90 | 3016 | ret = notification_thread_client_disconnect(client, state); |
ab0ee2ca JG |
3017 | end: |
3018 | rcu_read_unlock(); | |
3019 | return ret; | |
3020 | } | |
3021 | ||
3022 | int handle_notification_thread_client_disconnect_all( | |
3023 | struct notification_thread_state *state) | |
3024 | { | |
3025 | struct cds_lfht_iter iter; | |
3026 | struct notification_client *client; | |
3027 | bool error_encoutered = false; | |
3028 | ||
3029 | rcu_read_lock(); | |
3030 | DBG("[notification-thread] Closing all client connections"); | |
3031 | cds_lfht_for_each_entry(state->client_socket_ht, &iter, client, | |
505b2d90 | 3032 | client_socket_ht_node) { |
ab0ee2ca JG |
3033 | int ret; |
3034 | ||
505b2d90 JG |
3035 | ret = notification_thread_client_disconnect( |
3036 | client, state); | |
ab0ee2ca JG |
3037 | if (ret) { |
3038 | error_encoutered = true; | |
3039 | } | |
3040 | } | |
3041 | rcu_read_unlock(); | |
3042 | return error_encoutered ? 1 : 0; | |
3043 | } | |
3044 | ||
3045 | int handle_notification_thread_trigger_unregister_all( | |
3046 | struct notification_thread_state *state) | |
3047 | { | |
4149ace8 | 3048 | bool error_occurred = false; |
ab0ee2ca JG |
3049 | struct cds_lfht_iter iter; |
3050 | struct lttng_trigger_ht_element *trigger_ht_element; | |
3051 | ||
763de384 | 3052 | rcu_read_lock(); |
ab0ee2ca JG |
3053 | cds_lfht_for_each_entry(state->triggers_ht, &iter, trigger_ht_element, |
3054 | node) { | |
3055 | int ret = handle_notification_thread_command_unregister_trigger( | |
3056 | state, trigger_ht_element->trigger, NULL); | |
3057 | if (ret) { | |
4149ace8 | 3058 | error_occurred = true; |
ab0ee2ca JG |
3059 | } |
3060 | } | |
763de384 | 3061 | rcu_read_unlock(); |
4149ace8 | 3062 | return error_occurred ? -1 : 0; |
ab0ee2ca JG |
3063 | } |
3064 | ||
dd877ea6 JG |
3065 | static |
3066 | int client_handle_transmission_status( | |
3067 | struct notification_client *client, | |
3068 | enum client_transmission_status transmission_status, | |
3069 | struct notification_thread_state *state) | |
3070 | { | |
3071 | int ret = 0; | |
3072 | ||
3073 | switch (transmission_status) { | |
3074 | case CLIENT_TRANSMISSION_STATUS_COMPLETE: | |
3075 | ret = lttng_poll_mod(&state->events, client->socket, | |
3076 | CLIENT_POLL_MASK_IN); | |
3077 | if (ret) { | |
3078 | goto end; | |
3079 | } | |
3080 | ||
dd877ea6 JG |
3081 | break; |
3082 | case CLIENT_TRANSMISSION_STATUS_QUEUED: | |
3083 | /* | |
3084 | * We want to be notified whenever there is buffer space | |
3085 | * available to send the rest of the payload. | |
3086 | */ | |
3087 | ret = lttng_poll_mod(&state->events, client->socket, | |
3088 | CLIENT_POLL_MASK_IN_OUT); | |
3089 | if (ret) { | |
3090 | goto end; | |
3091 | } | |
3092 | break; | |
3093 | case CLIENT_TRANSMISSION_STATUS_FAIL: | |
3094 | ret = notification_thread_client_disconnect(client, state); | |
3095 | if (ret) { | |
3096 | goto end; | |
3097 | } | |
3098 | break; | |
3099 | case CLIENT_TRANSMISSION_STATUS_ERROR: | |
3100 | ret = -1; | |
3101 | goto end; | |
3102 | default: | |
3103 | abort(); | |
3104 | } | |
3105 | end: | |
3106 | return ret; | |
3107 | } | |
3108 | ||
505b2d90 | 3109 | /* Client lock must be acquired by caller. */ |
ab0ee2ca | 3110 | static |
dd877ea6 | 3111 | enum client_transmission_status client_flush_outgoing_queue( |
f2b3ef9f | 3112 | struct notification_client *client) |
ab0ee2ca JG |
3113 | { |
3114 | ssize_t ret; | |
3115 | size_t to_send_count; | |
dd877ea6 | 3116 | enum client_transmission_status status; |
882093ee JR |
3117 | struct lttng_payload_view pv = lttng_payload_view_from_payload( |
3118 | &client->communication.outbound.payload, 0, -1); | |
3119 | const int fds_to_send_count = | |
3120 | lttng_payload_view_get_fd_handle_count(&pv); | |
ab0ee2ca | 3121 | |
505b2d90 JG |
3122 | ASSERT_LOCKED(client->lock); |
3123 | ||
f2b3ef9f JG |
3124 | if (!client->communication.active) { |
3125 | status = CLIENT_TRANSMISSION_STATUS_FAIL; | |
3126 | goto end; | |
3127 | } | |
3128 | ||
882093ee JR |
3129 | if (pv.buffer.size == 0) { |
3130 | /* | |
3131 | * If both data and fds are equal to zero, we are in an invalid | |
3132 | * state. | |
3133 | */ | |
3134 | assert(fds_to_send_count != 0); | |
3135 | goto send_fds; | |
3136 | } | |
3137 | ||
3138 | /* Send data. */ | |
3139 | to_send_count = pv.buffer.size; | |
ab0ee2ca JG |
3140 | DBG("[notification-thread] Flushing client (socket fd = %i) outgoing queue", |
3141 | client->socket); | |
3142 | ||
3143 | ret = lttcomm_send_unix_sock_non_block(client->socket, | |
882093ee | 3144 | pv.buffer.data, |
ab0ee2ca | 3145 | to_send_count); |
44c180ca | 3146 | if ((ret >= 0 && ret < to_send_count)) { |
ab0ee2ca JG |
3147 | DBG("[notification-thread] Client (socket fd = %i) outgoing queue could not be completely flushed", |
3148 | client->socket); | |
3149 | to_send_count -= max(ret, 0); | |
3150 | ||
6f110534 | 3151 | memmove(client->communication.outbound.payload.buffer.data, |
882093ee JR |
3152 | pv.buffer.data + |
3153 | pv.buffer.size - to_send_count, | |
ab0ee2ca JG |
3154 | to_send_count); |
3155 | ret = lttng_dynamic_buffer_set_size( | |
882093ee | 3156 | &client->communication.outbound.payload.buffer, |
ab0ee2ca JG |
3157 | to_send_count); |
3158 | if (ret) { | |
3159 | goto error; | |
3160 | } | |
6c24d3fd | 3161 | |
dd877ea6 | 3162 | status = CLIENT_TRANSMISSION_STATUS_QUEUED; |
882093ee | 3163 | goto end; |
ab0ee2ca | 3164 | } else if (ret < 0) { |
6c24d3fd | 3165 | /* Generic error, disable the client's communication. */ |
dd877ea6 | 3166 | ERR("[notification-thread] Failed to flush outgoing queue, disconnecting client (socket fd = %i)", |
ab0ee2ca | 3167 | client->socket); |
6c24d3fd | 3168 | client->communication.active = false; |
dd877ea6 | 3169 | status = CLIENT_TRANSMISSION_STATUS_FAIL; |
882093ee | 3170 | goto end; |
ab0ee2ca | 3171 | } else { |
882093ee JR |
3172 | /* |
3173 | * No error and flushed the queue completely. | |
3174 | * | |
3175 | * The payload buffer size is used later to | |
3176 | * check if there is notifications queued. So albeit that the | |
3177 | * direct caller knows that the transmission is complete, we | |
3178 | * need to set the buffer size to zero. | |
3179 | */ | |
ab0ee2ca | 3180 | ret = lttng_dynamic_buffer_set_size( |
882093ee | 3181 | &client->communication.outbound.payload.buffer, 0); |
ab0ee2ca JG |
3182 | if (ret) { |
3183 | goto error; | |
3184 | } | |
882093ee | 3185 | } |
6c24d3fd | 3186 | |
882093ee JR |
3187 | send_fds: |
3188 | /* No fds to send, transmission is complete. */ | |
3189 | if (fds_to_send_count == 0) { | |
dd877ea6 | 3190 | status = CLIENT_TRANSMISSION_STATUS_COMPLETE; |
882093ee | 3191 | goto end; |
dd877ea6 | 3192 | } |
882093ee JR |
3193 | |
3194 | ret = lttcomm_send_payload_view_fds_unix_sock_non_block( | |
3195 | client->socket, &pv); | |
3196 | if (ret < 0) { | |
3197 | /* Generic error, disable the client's communication. */ | |
3198 | ERR("[notification-thread] Failed to flush outgoing fds queue, disconnecting client (socket fd = %i)", | |
3199 | client->socket); | |
3200 | client->communication.active = false; | |
3201 | status = CLIENT_TRANSMISSION_STATUS_FAIL; | |
3202 | goto end; | |
3203 | } else if (ret == 0) { | |
3204 | /* Nothing could be sent. */ | |
3205 | status = CLIENT_TRANSMISSION_STATUS_QUEUED; | |
3206 | } else { | |
3207 | /* Fd passing is an all or nothing kind of thing. */ | |
3208 | status = CLIENT_TRANSMISSION_STATUS_COMPLETE; | |
3209 | /* | |
3210 | * The payload _fd_array count is used later to | |
3211 | * check if there is notifications queued. So although the | |
3212 | * direct caller knows that the transmission is complete, we | |
3213 | * need to clear the _fd_array for the queuing check. | |
3214 | */ | |
3215 | lttng_dynamic_pointer_array_clear( | |
3216 | &client->communication.outbound.payload | |
3217 | ._fd_handles); | |
3218 | } | |
3219 | ||
f2b3ef9f | 3220 | end: |
882093ee JR |
3221 | if (status == CLIENT_TRANSMISSION_STATUS_COMPLETE) { |
3222 | client->communication.outbound.queued_command_reply = false; | |
3223 | client->communication.outbound.dropped_notification = false; | |
3224 | lttng_payload_clear(&client->communication.outbound.payload); | |
3225 | } | |
3226 | ||
f2b3ef9f | 3227 | return status; |
ab0ee2ca | 3228 | error: |
f2b3ef9f | 3229 | return CLIENT_TRANSMISSION_STATUS_ERROR; |
ab0ee2ca JG |
3230 | } |
3231 | ||
882093ee JR |
3232 | static |
3233 | bool client_has_outbound_data_left( | |
3234 | const struct notification_client *client) | |
3235 | { | |
3236 | const struct lttng_payload_view pv = lttng_payload_view_from_payload( | |
3237 | &client->communication.outbound.payload, 0, -1); | |
3238 | const bool has_data = pv.buffer.size != 0; | |
3239 | const bool has_fds = lttng_payload_view_get_fd_handle_count(&pv); | |
3240 | ||
3241 | return has_data || has_fds; | |
3242 | } | |
3243 | ||
6c24d3fd | 3244 | /* Client lock must _not_ be held by the caller. */ |
ab0ee2ca JG |
3245 | static |
3246 | int client_send_command_reply(struct notification_client *client, | |
3247 | struct notification_thread_state *state, | |
3248 | enum lttng_notification_channel_status status) | |
3249 | { | |
3250 | int ret; | |
3251 | struct lttng_notification_channel_command_reply reply = { | |
3252 | .status = (int8_t) status, | |
3253 | }; | |
3254 | struct lttng_notification_channel_message msg = { | |
3255 | .type = (int8_t) LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_COMMAND_REPLY, | |
3256 | .size = sizeof(reply), | |
3257 | }; | |
3258 | char buffer[sizeof(msg) + sizeof(reply)]; | |
f2b3ef9f | 3259 | enum client_transmission_status transmission_status; |
ab0ee2ca | 3260 | |
6c24d3fd JG |
3261 | memcpy(buffer, &msg, sizeof(msg)); |
3262 | memcpy(buffer + sizeof(msg), &reply, sizeof(reply)); | |
3263 | DBG("[notification-thread] Send command reply (%i)", (int) status); | |
505b2d90 | 3264 | |
6c24d3fd | 3265 | pthread_mutex_lock(&client->lock); |
ab0ee2ca JG |
3266 | if (client->communication.outbound.queued_command_reply) { |
3267 | /* Protocol error. */ | |
6c24d3fd | 3268 | goto error_unlock; |
ab0ee2ca JG |
3269 | } |
3270 | ||
ab0ee2ca JG |
3271 | /* Enqueue buffer to outgoing queue and flush it. */ |
3272 | ret = lttng_dynamic_buffer_append( | |
882093ee | 3273 | &client->communication.outbound.payload.buffer, |
ab0ee2ca JG |
3274 | buffer, sizeof(buffer)); |
3275 | if (ret) { | |
6c24d3fd | 3276 | goto error_unlock; |
ab0ee2ca JG |
3277 | } |
3278 | ||
f2b3ef9f | 3279 | transmission_status = client_flush_outgoing_queue(client); |
882093ee JR |
3280 | |
3281 | if (client_has_outbound_data_left(client)) { | |
6c24d3fd JG |
3282 | /* Queue could not be emptied. */ |
3283 | client->communication.outbound.queued_command_reply = true; | |
3284 | } | |
3285 | ||
3286 | pthread_mutex_unlock(&client->lock); | |
f2b3ef9f JG |
3287 | ret = client_handle_transmission_status( |
3288 | client, transmission_status, state); | |
ab0ee2ca JG |
3289 | if (ret) { |
3290 | goto error; | |
3291 | } | |
3292 | ||
ab0ee2ca | 3293 | return 0; |
6c24d3fd JG |
3294 | error_unlock: |
3295 | pthread_mutex_unlock(&client->lock); | |
ab0ee2ca JG |
3296 | error: |
3297 | return -1; | |
3298 | } | |
3299 | ||
505b2d90 JG |
3300 | static |
3301 | int client_handle_message_unknown(struct notification_client *client, | |
3302 | struct notification_thread_state *state) | |
3303 | { | |
3304 | int ret; | |
505b2d90 JG |
3305 | /* |
3306 | * Receiving message header. The function will be called again | |
3307 | * once the rest of the message as been received and can be | |
3308 | * interpreted. | |
3309 | */ | |
3310 | const struct lttng_notification_channel_message *msg; | |
3311 | ||
882093ee | 3312 | assert(sizeof(*msg) == client->communication.inbound.payload.buffer.size); |
505b2d90 | 3313 | msg = (const struct lttng_notification_channel_message *) |
882093ee | 3314 | client->communication.inbound.payload.buffer.data; |
505b2d90 JG |
3315 | |
3316 | if (msg->size == 0 || | |
3317 | msg->size > DEFAULT_MAX_NOTIFICATION_CLIENT_MESSAGE_PAYLOAD_SIZE) { | |
3318 | ERR("[notification-thread] Invalid notification channel message: length = %u", | |
3319 | msg->size); | |
3320 | ret = -1; | |
3321 | goto end; | |
3322 | } | |
3323 | ||
3324 | switch (msg->type) { | |
3325 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_SUBSCRIBE: | |
3326 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNSUBSCRIBE: | |
3327 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE: | |
3328 | break; | |
3329 | default: | |
3330 | ret = -1; | |
3331 | ERR("[notification-thread] Invalid notification channel message: unexpected message type"); | |
3332 | goto end; | |
3333 | } | |
3334 | ||
3335 | client->communication.inbound.bytes_to_receive = msg->size; | |
882093ee | 3336 | client->communication.inbound.fds_to_receive = msg->fds; |
505b2d90 JG |
3337 | client->communication.inbound.msg_type = |
3338 | (enum lttng_notification_channel_message_type) msg->type; | |
3339 | ret = lttng_dynamic_buffer_set_size( | |
882093ee JR |
3340 | &client->communication.inbound.payload.buffer, msg->size); |
3341 | ||
3342 | /* msg is not valid anymore due to lttng_dynamic_buffer_set_size. */ | |
3343 | msg = NULL; | |
505b2d90 | 3344 | end: |
505b2d90 JG |
3345 | return ret; |
3346 | } | |
3347 | ||
3348 | static | |
3349 | int client_handle_message_handshake(struct notification_client *client, | |
3350 | struct notification_thread_state *state) | |
3351 | { | |
3352 | int ret; | |
3353 | struct lttng_notification_channel_command_handshake *handshake_client; | |
3354 | const struct lttng_notification_channel_command_handshake handshake_reply = { | |
3355 | .major = LTTNG_NOTIFICATION_CHANNEL_VERSION_MAJOR, | |
3356 | .minor = LTTNG_NOTIFICATION_CHANNEL_VERSION_MINOR, | |
3357 | }; | |
3358 | const struct lttng_notification_channel_message msg_header = { | |
3359 | .type = LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE, | |
3360 | .size = sizeof(handshake_reply), | |
3361 | }; | |
3362 | enum lttng_notification_channel_status status = | |
3363 | LTTNG_NOTIFICATION_CHANNEL_STATUS_OK; | |
3364 | char send_buffer[sizeof(msg_header) + sizeof(handshake_reply)]; | |
505b2d90 JG |
3365 | |
3366 | memcpy(send_buffer, &msg_header, sizeof(msg_header)); | |
3367 | memcpy(send_buffer + sizeof(msg_header), &handshake_reply, | |
3368 | sizeof(handshake_reply)); | |
3369 | ||
3370 | handshake_client = | |
3371 | (struct lttng_notification_channel_command_handshake *) | |
882093ee | 3372 | client->communication.inbound.payload.buffer |
505b2d90 JG |
3373 | .data; |
3374 | client->major = handshake_client->major; | |
3375 | client->minor = handshake_client->minor; | |
3376 | if (!client->communication.inbound.creds_received) { | |
3377 | ERR("[notification-thread] No credentials received from client"); | |
3378 | ret = -1; | |
3379 | goto end; | |
3380 | } | |
3381 | ||
3382 | client->uid = LTTNG_SOCK_GET_UID_CRED( | |
3383 | &client->communication.inbound.creds); | |
3384 | client->gid = LTTNG_SOCK_GET_GID_CRED( | |
3385 | &client->communication.inbound.creds); | |
3386 | DBG("[notification-thread] Received handshake from client (uid = %u, gid = %u) with version %i.%i", | |
3387 | client->uid, client->gid, (int) client->major, | |
3388 | (int) client->minor); | |
3389 | ||
3390 | if (handshake_client->major != | |
3391 | LTTNG_NOTIFICATION_CHANNEL_VERSION_MAJOR) { | |
3392 | status = LTTNG_NOTIFICATION_CHANNEL_STATUS_UNSUPPORTED_VERSION; | |
3393 | } | |
3394 | ||
6c24d3fd JG |
3395 | pthread_mutex_lock(&client->lock); |
3396 | /* Outgoing queue will be flushed when the command reply is sent. */ | |
505b2d90 | 3397 | ret = lttng_dynamic_buffer_append( |
882093ee | 3398 | &client->communication.outbound.payload.buffer, send_buffer, |
505b2d90 JG |
3399 | sizeof(send_buffer)); |
3400 | if (ret) { | |
3401 | ERR("[notification-thread] Failed to send protocol version to notification channel client"); | |
6c24d3fd | 3402 | goto end_unlock; |
505b2d90 JG |
3403 | } |
3404 | ||
3405 | client->validated = true; | |
3406 | client->communication.active = true; | |
6c24d3fd | 3407 | pthread_mutex_unlock(&client->lock); |
505b2d90 | 3408 | |
6c24d3fd JG |
3409 | /* Set reception state to receive the next message header. */ |
3410 | ret = client_reset_inbound_state(client); | |
505b2d90 | 3411 | if (ret) { |
6c24d3fd | 3412 | ERR("[notification-thread] Failed to reset client communication's inbound state"); |
505b2d90 JG |
3413 | goto end; |
3414 | } | |
3415 | ||
6c24d3fd | 3416 | /* Flushes the outgoing queue. */ |
505b2d90 JG |
3417 | ret = client_send_command_reply(client, state, status); |
3418 | if (ret) { | |
3419 | ERR("[notification-thread] Failed to send reply to notification channel client"); | |
3420 | goto end; | |
3421 | } | |
3422 | ||
6c24d3fd JG |
3423 | goto end; |
3424 | end_unlock: | |
505b2d90 | 3425 | pthread_mutex_unlock(&client->lock); |
6c24d3fd | 3426 | end: |
505b2d90 JG |
3427 | return ret; |
3428 | } | |
3429 | ||
3430 | static | |
3431 | int client_handle_message_subscription( | |
3432 | struct notification_client *client, | |
3433 | enum lttng_notification_channel_message_type msg_type, | |
3434 | struct notification_thread_state *state) | |
3435 | { | |
3436 | int ret; | |
3437 | struct lttng_condition *condition; | |
3438 | enum lttng_notification_channel_status status = | |
3439 | LTTNG_NOTIFICATION_CHANNEL_STATUS_OK; | |
3440 | struct lttng_payload_view condition_view = | |
882093ee JR |
3441 | lttng_payload_view_from_payload( |
3442 | &client->communication.inbound.payload, | |
505b2d90 JG |
3443 | 0, -1); |
3444 | size_t expected_condition_size; | |
3445 | ||
6c24d3fd JG |
3446 | /* |
3447 | * No need to lock client to sample the inbound state as the only | |
3448 | * other thread accessing clients (action executor) only uses the | |
3449 | * outbound state. | |
3450 | */ | |
882093ee | 3451 | expected_condition_size = client->communication.inbound.payload.buffer.size; |
505b2d90 JG |
3452 | ret = lttng_condition_create_from_payload(&condition_view, &condition); |
3453 | if (ret != expected_condition_size) { | |
3454 | ERR("[notification-thread] Malformed condition received from client"); | |
3455 | goto end; | |
3456 | } | |
3457 | ||
3458 | if (msg_type == LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_SUBSCRIBE) { | |
3459 | ret = notification_thread_client_subscribe( | |
3460 | client, condition, state, &status); | |
3461 | } else { | |
3462 | ret = notification_thread_client_unsubscribe( | |
3463 | client, condition, state, &status); | |
3464 | } | |
505b2d90 | 3465 | |
505b2d90 | 3466 | if (ret) { |
6c24d3fd | 3467 | goto end; |
505b2d90 JG |
3468 | } |
3469 | ||
3470 | /* Set reception state to receive the next message header. */ | |
3471 | ret = client_reset_inbound_state(client); | |
3472 | if (ret) { | |
3473 | ERR("[notification-thread] Failed to reset client communication's inbound state"); | |
6c24d3fd JG |
3474 | goto end; |
3475 | } | |
3476 | ||
3477 | ret = client_send_command_reply(client, state, status); | |
3478 | if (ret) { | |
3479 | ERR("[notification-thread] Failed to send reply to notification channel client"); | |
3480 | goto end; | |
505b2d90 JG |
3481 | } |
3482 | ||
505b2d90 JG |
3483 | end: |
3484 | return ret; | |
3485 | } | |
3486 | ||
ab0ee2ca JG |
3487 | static |
3488 | int client_dispatch_message(struct notification_client *client, | |
3489 | struct notification_thread_state *state) | |
3490 | { | |
3491 | int ret = 0; | |
3492 | ||
3493 | if (client->communication.inbound.msg_type != | |
3494 | LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE && | |
3495 | client->communication.inbound.msg_type != | |
3496 | LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNKNOWN && | |
3497 | !client->validated) { | |
3498 | WARN("[notification-thread] client attempted a command before handshake"); | |
3499 | ret = -1; | |
3500 | goto end; | |
3501 | } | |
3502 | ||
3503 | switch (client->communication.inbound.msg_type) { | |
3504 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNKNOWN: | |
3505 | { | |
505b2d90 | 3506 | ret = client_handle_message_unknown(client, state); |
ab0ee2ca JG |
3507 | break; |
3508 | } | |
3509 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE: | |
3510 | { | |
505b2d90 | 3511 | ret = client_handle_message_handshake(client, state); |
ab0ee2ca JG |
3512 | break; |
3513 | } | |
3514 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_SUBSCRIBE: | |
3515 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNSUBSCRIBE: | |
3516 | { | |
505b2d90 JG |
3517 | ret = client_handle_message_subscription(client, |
3518 | client->communication.inbound.msg_type, state); | |
ab0ee2ca JG |
3519 | break; |
3520 | } | |
3521 | default: | |
3522 | abort(); | |
3523 | } | |
3524 | end: | |
3525 | return ret; | |
3526 | } | |
3527 | ||
3528 | /* Incoming data from client. */ | |
3529 | int handle_notification_thread_client_in( | |
3530 | struct notification_thread_state *state, int socket) | |
3531 | { | |
14fa22f8 | 3532 | int ret = 0; |
ab0ee2ca JG |
3533 | struct notification_client *client; |
3534 | ssize_t recv_ret; | |
3535 | size_t offset; | |
3536 | ||
98b5ff34 | 3537 | rcu_read_lock(); |
ab0ee2ca JG |
3538 | client = get_client_from_socket(socket, state); |
3539 | if (!client) { | |
3540 | /* Internal error, abort. */ | |
3541 | ret = -1; | |
3542 | goto end; | |
3543 | } | |
3544 | ||
882093ee | 3545 | offset = client->communication.inbound.payload.buffer.size - |
14fa22f8 | 3546 | client->communication.inbound.bytes_to_receive; |
01ea340e | 3547 | if (client->communication.inbound.expect_creds) { |
ab0ee2ca | 3548 | recv_ret = lttcomm_recv_creds_unix_sock(socket, |
882093ee | 3549 | client->communication.inbound.payload.buffer.data + offset, |
ab0ee2ca JG |
3550 | client->communication.inbound.bytes_to_receive, |
3551 | &client->communication.inbound.creds); | |
3552 | if (recv_ret > 0) { | |
01ea340e | 3553 | client->communication.inbound.expect_creds = false; |
ab0ee2ca JG |
3554 | client->communication.inbound.creds_received = true; |
3555 | } | |
3556 | } else { | |
3557 | recv_ret = lttcomm_recv_unix_sock_non_block(socket, | |
882093ee | 3558 | client->communication.inbound.payload.buffer.data + offset, |
ab0ee2ca JG |
3559 | client->communication.inbound.bytes_to_receive); |
3560 | } | |
505b2d90 JG |
3561 | if (recv_ret >= 0) { |
3562 | client->communication.inbound.bytes_to_receive -= recv_ret; | |
882093ee JR |
3563 | } else { |
3564 | goto error_disconnect_client; | |
505b2d90 | 3565 | } |
6c24d3fd | 3566 | |
882093ee JR |
3567 | if (client->communication.inbound.bytes_to_receive != 0) { |
3568 | /* Message incomplete wait for more data. */ | |
3569 | ret = 0; | |
3570 | goto end; | |
ab0ee2ca JG |
3571 | } |
3572 | ||
882093ee JR |
3573 | assert(client->communication.inbound.bytes_to_receive == 0); |
3574 | ||
3575 | /* Receive fds. */ | |
3576 | if (client->communication.inbound.fds_to_receive != 0) { | |
3577 | ret = lttcomm_recv_payload_fds_unix_sock_non_block( | |
3578 | client->socket, | |
3579 | client->communication.inbound.fds_to_receive, | |
3580 | &client->communication.inbound.payload); | |
3581 | if (ret > 0) { | |
ab0ee2ca | 3582 | /* |
882093ee JR |
3583 | * Fds received. non blocking fds passing is all |
3584 | * or nothing. | |
ab0ee2ca | 3585 | */ |
882093ee JR |
3586 | ssize_t expected_size; |
3587 | ||
3588 | expected_size = sizeof(int) * | |
3589 | client->communication.inbound | |
3590 | .fds_to_receive; | |
3591 | assert(ret == expected_size); | |
3592 | client->communication.inbound.fds_to_receive = 0; | |
3593 | } else if (ret == 0) { | |
3594 | /* Received nothing. */ | |
3595 | ret = 0; | |
3596 | goto end; | |
3597 | } else { | |
ab0ee2ca JG |
3598 | goto error_disconnect_client; |
3599 | } | |
ab0ee2ca | 3600 | } |
882093ee JR |
3601 | |
3602 | /* At this point the message is complete.*/ | |
3603 | assert(client->communication.inbound.bytes_to_receive == 0 && | |
3604 | client->communication.inbound.fds_to_receive == 0); | |
3605 | ret = client_dispatch_message(client, state); | |
3606 | if (ret) { | |
3607 | /* | |
3608 | * Only returns an error if this client must be | |
3609 | * disconnected. | |
3610 | */ | |
3611 | goto error_disconnect_client; | |
3612 | } | |
3613 | ||
ab0ee2ca | 3614 | end: |
98b5ff34 | 3615 | rcu_read_unlock(); |
ab0ee2ca | 3616 | return ret; |
882093ee | 3617 | |
ab0ee2ca | 3618 | error_disconnect_client: |
505b2d90 | 3619 | ret = notification_thread_client_disconnect(client, state); |
98b5ff34 | 3620 | goto end; |
ab0ee2ca JG |
3621 | } |
3622 | ||
3623 | /* Client ready to receive outgoing data. */ | |
3624 | int handle_notification_thread_client_out( | |
3625 | struct notification_thread_state *state, int socket) | |
3626 | { | |
3627 | int ret; | |
3628 | struct notification_client *client; | |
f2b3ef9f | 3629 | enum client_transmission_status transmission_status; |
ab0ee2ca | 3630 | |
98b5ff34 | 3631 | rcu_read_lock(); |
ab0ee2ca JG |
3632 | client = get_client_from_socket(socket, state); |
3633 | if (!client) { | |
3634 | /* Internal error, abort. */ | |
3635 | ret = -1; | |
3636 | goto end; | |
3637 | } | |
3638 | ||
505b2d90 | 3639 | pthread_mutex_lock(&client->lock); |
f2b3ef9f | 3640 | transmission_status = client_flush_outgoing_queue(client); |
6c24d3fd JG |
3641 | pthread_mutex_unlock(&client->lock); |
3642 | ||
f2b3ef9f JG |
3643 | ret = client_handle_transmission_status( |
3644 | client, transmission_status, state); | |
ab0ee2ca JG |
3645 | if (ret) { |
3646 | goto end; | |
3647 | } | |
3648 | end: | |
98b5ff34 | 3649 | rcu_read_unlock(); |
ab0ee2ca JG |
3650 | return ret; |
3651 | } | |
3652 | ||
3653 | static | |
e8360425 JD |
3654 | bool evaluate_buffer_usage_condition(const struct lttng_condition *condition, |
3655 | const struct channel_state_sample *sample, | |
3656 | uint64_t buffer_capacity) | |
ab0ee2ca JG |
3657 | { |
3658 | bool result = false; | |
3659 | uint64_t threshold; | |
3660 | enum lttng_condition_type condition_type; | |
e8360425 | 3661 | const struct lttng_condition_buffer_usage *use_condition = container_of( |
ab0ee2ca JG |
3662 | condition, struct lttng_condition_buffer_usage, |
3663 | parent); | |
3664 | ||
ab0ee2ca JG |
3665 | if (use_condition->threshold_bytes.set) { |
3666 | threshold = use_condition->threshold_bytes.value; | |
3667 | } else { | |
3668 | /* | |
3669 | * Threshold was expressed as a ratio. | |
3670 | * | |
3671 | * TODO the threshold (in bytes) of conditions expressed | |
3672 | * as a ratio of total buffer size could be cached to | |
3673 | * forego this double-multiplication or it could be performed | |
3674 | * as fixed-point math. | |
3675 | * | |
d49487dc | 3676 | * Note that caching should accommodates the case where the |
ab0ee2ca JG |
3677 | * condition applies to multiple channels (i.e. don't assume |
3678 | * that all channels matching my_chann* have the same size...) | |
3679 | */ | |
3680 | threshold = (uint64_t) (use_condition->threshold_ratio.value * | |
3681 | (double) buffer_capacity); | |
3682 | } | |
3683 | ||
3684 | condition_type = lttng_condition_get_type(condition); | |
3685 | if (condition_type == LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW) { | |
3686 | DBG("[notification-thread] Low buffer usage condition being evaluated: threshold = %" PRIu64 ", highest usage = %" PRIu64, | |
3687 | threshold, sample->highest_usage); | |
3688 | ||
3689 | /* | |
3690 | * The low condition should only be triggered once _all_ of the | |
3691 | * streams in a channel have gone below the "low" threshold. | |
3692 | */ | |
3693 | if (sample->highest_usage <= threshold) { | |
3694 | result = true; | |
3695 | } | |
3696 | } else { | |
3697 | DBG("[notification-thread] High buffer usage condition being evaluated: threshold = %" PRIu64 ", highest usage = %" PRIu64, | |
3698 | threshold, sample->highest_usage); | |
3699 | ||
3700 | /* | |
3701 | * For high buffer usage scenarios, we want to trigger whenever | |
3702 | * _any_ of the streams has reached the "high" threshold. | |
3703 | */ | |
3704 | if (sample->highest_usage >= threshold) { | |
3705 | result = true; | |
3706 | } | |
3707 | } | |
e8360425 | 3708 | |
ab0ee2ca JG |
3709 | return result; |
3710 | } | |
3711 | ||
3712 | static | |
e8360425 JD |
3713 | bool evaluate_session_consumed_size_condition( |
3714 | const struct lttng_condition *condition, | |
3715 | uint64_t session_consumed_size) | |
3716 | { | |
3717 | uint64_t threshold; | |
3718 | const struct lttng_condition_session_consumed_size *size_condition = | |
3719 | container_of(condition, | |
3720 | struct lttng_condition_session_consumed_size, | |
3721 | parent); | |
3722 | ||
3723 | threshold = size_condition->consumed_threshold_bytes.value; | |
3724 | DBG("[notification-thread] Session consumed size condition being evaluated: threshold = %" PRIu64 ", current size = %" PRIu64, | |
3725 | threshold, session_consumed_size); | |
3726 | return session_consumed_size >= threshold; | |
3727 | } | |
3728 | ||
3729 | static | |
ed327204 | 3730 | int evaluate_buffer_condition(const struct lttng_condition *condition, |
ab0ee2ca | 3731 | struct lttng_evaluation **evaluation, |
e8360425 JD |
3732 | const struct notification_thread_state *state, |
3733 | const struct channel_state_sample *previous_sample, | |
3734 | const struct channel_state_sample *latest_sample, | |
3735 | uint64_t previous_session_consumed_total, | |
3736 | uint64_t latest_session_consumed_total, | |
3737 | struct channel_info *channel_info) | |
ab0ee2ca JG |
3738 | { |
3739 | int ret = 0; | |
3740 | enum lttng_condition_type condition_type; | |
e8360425 JD |
3741 | const bool previous_sample_available = !!previous_sample; |
3742 | bool previous_sample_result = false; | |
ab0ee2ca JG |
3743 | bool latest_sample_result; |
3744 | ||
3745 | condition_type = lttng_condition_get_type(condition); | |
ab0ee2ca | 3746 | |
e8360425 JD |
3747 | switch (condition_type) { |
3748 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
3749 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
3750 | if (caa_likely(previous_sample_available)) { | |
3751 | previous_sample_result = | |
3752 | evaluate_buffer_usage_condition(condition, | |
3753 | previous_sample, channel_info->capacity); | |
3754 | } | |
3755 | latest_sample_result = evaluate_buffer_usage_condition( | |
3756 | condition, latest_sample, | |
3757 | channel_info->capacity); | |
3758 | break; | |
3759 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
3760 | if (caa_likely(previous_sample_available)) { | |
3761 | previous_sample_result = | |
3762 | evaluate_session_consumed_size_condition( | |
3763 | condition, | |
3764 | previous_session_consumed_total); | |
3765 | } | |
3766 | latest_sample_result = | |
3767 | evaluate_session_consumed_size_condition( | |
3768 | condition, | |
3769 | latest_session_consumed_total); | |
3770 | break; | |
3771 | default: | |
3772 | /* Unknown condition type; internal error. */ | |
3773 | abort(); | |
3774 | } | |
ab0ee2ca JG |
3775 | |
3776 | if (!latest_sample_result || | |
3777 | (previous_sample_result == latest_sample_result)) { | |
3778 | /* | |
3779 | * Only trigger on a condition evaluation transition. | |
3780 | * | |
3781 | * NOTE: This edge-triggered logic may not be appropriate for | |
3782 | * future condition types. | |
3783 | */ | |
3784 | goto end; | |
3785 | } | |
3786 | ||
e8360425 JD |
3787 | if (!evaluation || !latest_sample_result) { |
3788 | goto end; | |
3789 | } | |
3790 | ||
3791 | switch (condition_type) { | |
3792 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
3793 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
ab0ee2ca JG |
3794 | *evaluation = lttng_evaluation_buffer_usage_create( |
3795 | condition_type, | |
3796 | latest_sample->highest_usage, | |
e8360425 JD |
3797 | channel_info->capacity); |
3798 | break; | |
3799 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
3800 | *evaluation = lttng_evaluation_session_consumed_size_create( | |
e8360425 JD |
3801 | latest_session_consumed_total); |
3802 | break; | |
3803 | default: | |
3804 | abort(); | |
3805 | } | |
3806 | ||
3807 | if (!*evaluation) { | |
3808 | ret = -1; | |
3809 | goto end; | |
ab0ee2ca JG |
3810 | } |
3811 | end: | |
3812 | return ret; | |
3813 | } | |
3814 | ||
3815 | static | |
f2b3ef9f | 3816 | int client_notification_overflow(struct notification_client *client) |
ab0ee2ca | 3817 | { |
f2b3ef9f JG |
3818 | int ret = 0; |
3819 | const struct lttng_notification_channel_message msg = { | |
ab0ee2ca | 3820 | .type = (int8_t) LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_NOTIFICATION_DROPPED, |
ab0ee2ca JG |
3821 | }; |
3822 | ||
505b2d90 JG |
3823 | ASSERT_LOCKED(client->lock); |
3824 | ||
f2b3ef9f JG |
3825 | DBG("Dropping notification addressed to client (socket fd = %i)", |
3826 | client->socket); | |
3827 | if (client->communication.outbound.dropped_notification) { | |
3828 | /* | |
3829 | * The client already has a "notification dropped" message | |
3830 | * in its outgoing queue. Nothing to do since all | |
3831 | * of those messages are coalesced. | |
3832 | */ | |
3833 | goto end; | |
3834 | } | |
3835 | ||
3836 | client->communication.outbound.dropped_notification = true; | |
ab0ee2ca | 3837 | ret = lttng_dynamic_buffer_append( |
882093ee | 3838 | &client->communication.outbound.payload.buffer, &msg, |
ab0ee2ca | 3839 | sizeof(msg)); |
f2b3ef9f JG |
3840 | if (ret) { |
3841 | PERROR("Failed to enqueue \"dropped notification\" message in client's (socket fd = %i) outgoing queue", | |
3842 | client->socket); | |
3843 | } | |
3844 | end: | |
ab0ee2ca JG |
3845 | return ret; |
3846 | } | |
3847 | ||
f2b3ef9f JG |
3848 | static int client_handle_transmission_status_wrapper( |
3849 | struct notification_client *client, | |
3850 | enum client_transmission_status status, | |
3851 | void *user_data) | |
3852 | { | |
3853 | return client_handle_transmission_status(client, status, | |
3854 | (struct notification_thread_state *) user_data); | |
3855 | } | |
3856 | ||
3857 | static | |
3858 | int send_evaluation_to_clients(const struct lttng_trigger *trigger, | |
3859 | const struct lttng_evaluation *evaluation, | |
3860 | struct notification_client_list* client_list, | |
3861 | struct notification_thread_state *state, | |
3862 | uid_t object_uid, gid_t object_gid) | |
3863 | { | |
ff588497 JR |
3864 | const struct lttng_credentials creds = { |
3865 | .uid = LTTNG_OPTIONAL_INIT_VALUE(object_uid), | |
3866 | .gid = LTTNG_OPTIONAL_INIT_VALUE(object_gid), | |
3867 | }; | |
3868 | ||
f2b3ef9f JG |
3869 | return notification_client_list_send_evaluation(client_list, |
3870 | lttng_trigger_get_const_condition(trigger), evaluation, | |
3871 | lttng_trigger_get_credentials(trigger), | |
ff588497 | 3872 | &creds, |
f2b3ef9f JG |
3873 | client_handle_transmission_status_wrapper, state); |
3874 | } | |
3875 | ||
f37d0f86 JG |
3876 | /* |
3877 | * Permission checks relative to notification channel clients are performed | |
3878 | * here. Notice how object, client, and trigger credentials are involved in | |
3879 | * this check. | |
3880 | * | |
3881 | * The `object` credentials are the credentials associated with the "subject" | |
3882 | * of a condition. For instance, a `rotation completed` condition applies | |
3883 | * to a session. When that condition is met, it will produce an evaluation | |
3884 | * against a session. Hence, in this case, the `object` credentials are the | |
3885 | * credentials of the "subject" session. | |
3886 | * | |
3887 | * The `trigger` credentials are the credentials of the user that registered the | |
3888 | * trigger. | |
3889 | * | |
3890 | * The `client` credentials are the credentials of the user that created a given | |
3891 | * notification channel. | |
3892 | * | |
3893 | * In terms of visibility, it is expected that non-privilieged users can only | |
3894 | * register triggers against "their" objects (their own sessions and | |
3895 | * applications they are allowed to interact with). They can then open a | |
3896 | * notification channel and subscribe to notifications associated with those | |
3897 | * triggers. | |
3898 | * | |
3899 | * As for privilieged users, they can register triggers against the objects of | |
3900 | * other users. They can then subscribe to the notifications associated to their | |
3901 | * triggers. Privilieged users _can't_ subscribe to the notifications of | |
3902 | * triggers owned by other users; they must create their own triggers. | |
3903 | * | |
3904 | * This is more a concern of usability than security. It would be difficult for | |
3905 | * a root user reliably subscribe to a specific set of conditions without | |
3906 | * interference from external users (those could, for instance, unregister | |
3907 | * their triggers). | |
3908 | */ | |
f2b3ef9f JG |
3909 | LTTNG_HIDDEN |
3910 | int notification_client_list_send_evaluation( | |
3911 | struct notification_client_list *client_list, | |
3912 | const struct lttng_condition *condition, | |
9b63a4aa | 3913 | const struct lttng_evaluation *evaluation, |
f2b3ef9f JG |
3914 | const struct lttng_credentials *trigger_creds, |
3915 | const struct lttng_credentials *source_object_creds, | |
3916 | report_client_transmission_result_cb client_report, | |
3917 | void *user_data) | |
ab0ee2ca JG |
3918 | { |
3919 | int ret = 0; | |
c0a66c84 | 3920 | struct lttng_payload msg_payload; |
ab0ee2ca | 3921 | struct notification_client_list_element *client_list_element, *tmp; |
9b63a4aa | 3922 | const struct lttng_notification notification = { |
f2b3ef9f | 3923 | .condition = (struct lttng_condition *) condition, |
9b63a4aa JG |
3924 | .evaluation = (struct lttng_evaluation *) evaluation, |
3925 | }; | |
3647288f JG |
3926 | struct lttng_notification_channel_message msg_header = { |
3927 | .type = (int8_t) LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_NOTIFICATION, | |
3928 | }; | |
ab0ee2ca | 3929 | |
c0a66c84 | 3930 | lttng_payload_init(&msg_payload); |
ab0ee2ca | 3931 | |
c0a66c84 | 3932 | ret = lttng_dynamic_buffer_append(&msg_payload.buffer, &msg_header, |
3647288f | 3933 | sizeof(msg_header)); |
ab0ee2ca JG |
3934 | if (ret) { |
3935 | goto end; | |
3936 | } | |
3937 | ||
c0a66c84 | 3938 | ret = lttng_notification_serialize(¬ification, &msg_payload); |
ab0ee2ca | 3939 | if (ret) { |
ab0ee2ca JG |
3940 | ERR("[notification-thread] Failed to serialize notification"); |
3941 | ret = -1; | |
3942 | goto end; | |
3943 | } | |
3944 | ||
3647288f | 3945 | /* Update payload size. */ |
505b2d90 JG |
3946 | ((struct lttng_notification_channel_message *) msg_payload.buffer.data) |
3947 | ->size = (uint32_t)( | |
3948 | msg_payload.buffer.size - sizeof(msg_header)); | |
3647288f | 3949 | |
882093ee JR |
3950 | /* Update the payload number of fds. */ |
3951 | { | |
3952 | const struct lttng_payload_view pv = lttng_payload_view_from_payload( | |
3953 | &msg_payload, 0, -1); | |
3954 | ||
3955 | ((struct lttng_notification_channel_message *) | |
3956 | msg_payload.buffer.data)->fds = (uint32_t) | |
3957 | lttng_payload_view_get_fd_handle_count(&pv); | |
3958 | } | |
3959 | ||
505b2d90 | 3960 | pthread_mutex_lock(&client_list->lock); |
ab0ee2ca JG |
3961 | cds_list_for_each_entry_safe(client_list_element, tmp, |
3962 | &client_list->list, node) { | |
f2b3ef9f | 3963 | enum client_transmission_status transmission_status; |
ab0ee2ca JG |
3964 | struct notification_client *client = |
3965 | client_list_element->client; | |
3966 | ||
505b2d90 JG |
3967 | ret = 0; |
3968 | pthread_mutex_lock(&client->lock); | |
6c24d3fd JG |
3969 | if (!client->communication.active) { |
3970 | /* | |
3971 | * Skip inactive client (protocol error or | |
3972 | * disconnecting). | |
3973 | */ | |
3974 | DBG("Skipping client at it is marked as inactive"); | |
3975 | goto skip_client; | |
3976 | } | |
3977 | ||
f2b3ef9f | 3978 | if (source_object_creds) { |
ff588497 JR |
3979 | if (client->uid != lttng_credentials_get_uid(source_object_creds) && |
3980 | client->gid != lttng_credentials_get_gid(source_object_creds) && | |
f2b3ef9f JG |
3981 | client->uid != 0) { |
3982 | /* | |
3983 | * Client is not allowed to monitor this | |
3984 | * object. | |
3985 | */ | |
3986 | DBG("[notification-thread] Skipping client at it does not have the object permission to receive notification for this trigger"); | |
6c24d3fd | 3987 | goto skip_client; |
f2b3ef9f | 3988 | } |
90843f49 JR |
3989 | } |
3990 | ||
ff588497 | 3991 | if (client->uid != lttng_credentials_get_uid(trigger_creds) && client->gid != lttng_credentials_get_gid(trigger_creds)) { |
90843f49 | 3992 | DBG("[notification-thread] Skipping client at it does not have the permission to receive notification for this trigger"); |
6c24d3fd | 3993 | goto skip_client; |
ab0ee2ca JG |
3994 | } |
3995 | ||
3996 | DBG("[notification-thread] Sending notification to client (fd = %i, %zu bytes)", | |
c0a66c84 | 3997 | client->socket, msg_payload.buffer.size); |
882093ee JR |
3998 | |
3999 | if (client_has_outbound_data_left(client)) { | |
ab0ee2ca JG |
4000 | /* |
4001 | * Outgoing data is already buffered for this client; | |
4002 | * drop the notification and enqueue a "dropped | |
4003 | * notification" message if this is the first dropped | |
4004 | * notification since the socket spilled-over to the | |
4005 | * queue. | |
4006 | */ | |
f2b3ef9f JG |
4007 | ret = client_notification_overflow(client); |
4008 | if (ret) { | |
6c24d3fd JG |
4009 | /* Fatal error. */ |
4010 | goto skip_client; | |
ab0ee2ca | 4011 | } |
ab0ee2ca JG |
4012 | } |
4013 | ||
882093ee | 4014 | ret = lttng_payload_copy(&msg_payload, &client->communication.outbound.payload); |
ab0ee2ca | 4015 | if (ret) { |
6c24d3fd JG |
4016 | /* Fatal error. */ |
4017 | goto skip_client; | |
ab0ee2ca JG |
4018 | } |
4019 | ||
f2b3ef9f | 4020 | transmission_status = client_flush_outgoing_queue(client); |
6c24d3fd | 4021 | pthread_mutex_unlock(&client->lock); |
f2b3ef9f | 4022 | ret = client_report(client, transmission_status, user_data); |
ab0ee2ca | 4023 | if (ret) { |
6c24d3fd JG |
4024 | /* Fatal error. */ |
4025 | goto end_unlock_list; | |
505b2d90 | 4026 | } |
6c24d3fd JG |
4027 | |
4028 | continue; | |
4029 | ||
4030 | skip_client: | |
505b2d90 JG |
4031 | pthread_mutex_unlock(&client->lock); |
4032 | if (ret) { | |
6c24d3fd | 4033 | /* Fatal error. */ |
505b2d90 | 4034 | goto end_unlock_list; |
ab0ee2ca JG |
4035 | } |
4036 | } | |
4037 | ret = 0; | |
505b2d90 JG |
4038 | |
4039 | end_unlock_list: | |
4040 | pthread_mutex_unlock(&client_list->lock); | |
ab0ee2ca | 4041 | end: |
c0a66c84 | 4042 | lttng_payload_reset(&msg_payload); |
ab0ee2ca JG |
4043 | return ret; |
4044 | } | |
4045 | ||
4046 | int handle_notification_thread_channel_sample( | |
4047 | struct notification_thread_state *state, int pipe, | |
4048 | enum lttng_domain_type domain) | |
4049 | { | |
4050 | int ret = 0; | |
4051 | struct lttcomm_consumer_channel_monitor_msg sample_msg; | |
ab0ee2ca JG |
4052 | struct channel_info *channel_info; |
4053 | struct cds_lfht_node *node; | |
4054 | struct cds_lfht_iter iter; | |
4055 | struct lttng_channel_trigger_list *trigger_list; | |
4056 | struct lttng_trigger_list_element *trigger_list_element; | |
4057 | bool previous_sample_available = false; | |
e8360425 JD |
4058 | struct channel_state_sample previous_sample, latest_sample; |
4059 | uint64_t previous_session_consumed_total, latest_session_consumed_total; | |
f2b3ef9f | 4060 | struct lttng_credentials channel_creds; |
ab0ee2ca JG |
4061 | |
4062 | /* | |
4063 | * The monitoring pipe only holds messages smaller than PIPE_BUF, | |
4064 | * ensuring that read/write of sampling messages are atomic. | |
4065 | */ | |
7c2551ef | 4066 | ret = lttng_read(pipe, &sample_msg, sizeof(sample_msg)); |
ab0ee2ca JG |
4067 | if (ret != sizeof(sample_msg)) { |
4068 | ERR("[notification-thread] Failed to read from monitoring pipe (fd = %i)", | |
4069 | pipe); | |
4070 | ret = -1; | |
4071 | goto end; | |
4072 | } | |
4073 | ||
4074 | ret = 0; | |
4075 | latest_sample.key.key = sample_msg.key; | |
4076 | latest_sample.key.domain = domain; | |
4077 | latest_sample.highest_usage = sample_msg.highest; | |
4078 | latest_sample.lowest_usage = sample_msg.lowest; | |
e8360425 | 4079 | latest_sample.channel_total_consumed = sample_msg.total_consumed; |
ab0ee2ca JG |
4080 | |
4081 | rcu_read_lock(); | |
4082 | ||
4083 | /* Retrieve the channel's informations */ | |
4084 | cds_lfht_lookup(state->channels_ht, | |
4085 | hash_channel_key(&latest_sample.key), | |
4086 | match_channel_info, | |
4087 | &latest_sample.key, | |
4088 | &iter); | |
4089 | node = cds_lfht_iter_get_node(&iter); | |
e0b5f87b | 4090 | if (caa_unlikely(!node)) { |
ab0ee2ca JG |
4091 | /* |
4092 | * Not an error since the consumer can push a sample to the pipe | |
4093 | * and the rest of the session daemon could notify us of the | |
4094 | * channel's destruction before we get a chance to process that | |
4095 | * sample. | |
4096 | */ | |
4097 | DBG("[notification-thread] Received a sample for an unknown channel from consumerd, key = %" PRIu64 " in %s domain", | |
4098 | latest_sample.key.key, | |
4099 | domain == LTTNG_DOMAIN_KERNEL ? "kernel" : | |
4100 | "user space"); | |
4101 | goto end_unlock; | |
4102 | } | |
4103 | channel_info = caa_container_of(node, struct channel_info, | |
4104 | channels_ht_node); | |
e8360425 | 4105 | DBG("[notification-thread] Handling channel sample for channel %s (key = %" PRIu64 ") in session %s (highest usage = %" PRIu64 ", lowest usage = %" PRIu64", total consumed = %" PRIu64")", |
8abe313a | 4106 | channel_info->name, |
ab0ee2ca | 4107 | latest_sample.key.key, |
8abe313a | 4108 | channel_info->session_info->name, |
ab0ee2ca | 4109 | latest_sample.highest_usage, |
e8360425 JD |
4110 | latest_sample.lowest_usage, |
4111 | latest_sample.channel_total_consumed); | |
4112 | ||
4113 | previous_session_consumed_total = | |
4114 | channel_info->session_info->consumed_data_size; | |
ab0ee2ca JG |
4115 | |
4116 | /* Retrieve the channel's last sample, if it exists, and update it. */ | |
4117 | cds_lfht_lookup(state->channel_state_ht, | |
4118 | hash_channel_key(&latest_sample.key), | |
4119 | match_channel_state_sample, | |
4120 | &latest_sample.key, | |
4121 | &iter); | |
4122 | node = cds_lfht_iter_get_node(&iter); | |
e0b5f87b | 4123 | if (caa_likely(node)) { |
ab0ee2ca JG |
4124 | struct channel_state_sample *stored_sample; |
4125 | ||
4126 | /* Update the sample stored. */ | |
4127 | stored_sample = caa_container_of(node, | |
4128 | struct channel_state_sample, | |
4129 | channel_state_ht_node); | |
e8360425 | 4130 | |
ab0ee2ca JG |
4131 | memcpy(&previous_sample, stored_sample, |
4132 | sizeof(previous_sample)); | |
4133 | stored_sample->highest_usage = latest_sample.highest_usage; | |
4134 | stored_sample->lowest_usage = latest_sample.lowest_usage; | |
0f0479d7 | 4135 | stored_sample->channel_total_consumed = latest_sample.channel_total_consumed; |
ab0ee2ca | 4136 | previous_sample_available = true; |
e8360425 JD |
4137 | |
4138 | latest_session_consumed_total = | |
4139 | previous_session_consumed_total + | |
4140 | (latest_sample.channel_total_consumed - previous_sample.channel_total_consumed); | |
ab0ee2ca JG |
4141 | } else { |
4142 | /* | |
4143 | * This is the channel's first sample, allocate space for and | |
4144 | * store the new sample. | |
4145 | */ | |
4146 | struct channel_state_sample *stored_sample; | |
4147 | ||
4148 | stored_sample = zmalloc(sizeof(*stored_sample)); | |
4149 | if (!stored_sample) { | |
4150 | ret = -1; | |
4151 | goto end_unlock; | |
4152 | } | |
4153 | ||
4154 | memcpy(stored_sample, &latest_sample, sizeof(*stored_sample)); | |
4155 | cds_lfht_node_init(&stored_sample->channel_state_ht_node); | |
4156 | cds_lfht_add(state->channel_state_ht, | |
4157 | hash_channel_key(&stored_sample->key), | |
4158 | &stored_sample->channel_state_ht_node); | |
e8360425 JD |
4159 | |
4160 | latest_session_consumed_total = | |
4161 | previous_session_consumed_total + | |
4162 | latest_sample.channel_total_consumed; | |
ab0ee2ca JG |
4163 | } |
4164 | ||
e8360425 JD |
4165 | channel_info->session_info->consumed_data_size = |
4166 | latest_session_consumed_total; | |
4167 | ||
ab0ee2ca JG |
4168 | /* Find triggers associated with this channel. */ |
4169 | cds_lfht_lookup(state->channel_triggers_ht, | |
4170 | hash_channel_key(&latest_sample.key), | |
4171 | match_channel_trigger_list, | |
4172 | &latest_sample.key, | |
4173 | &iter); | |
4174 | node = cds_lfht_iter_get_node(&iter); | |
e0b5f87b | 4175 | if (caa_likely(!node)) { |
ab0ee2ca JG |
4176 | goto end_unlock; |
4177 | } | |
4178 | ||
f2b3ef9f | 4179 | channel_creds = (typeof(channel_creds)) { |
ff588497 JR |
4180 | .uid = LTTNG_OPTIONAL_INIT_VALUE(channel_info->session_info->uid), |
4181 | .gid = LTTNG_OPTIONAL_INIT_VALUE(channel_info->session_info->gid), | |
f2b3ef9f JG |
4182 | }; |
4183 | ||
ab0ee2ca JG |
4184 | trigger_list = caa_container_of(node, struct lttng_channel_trigger_list, |
4185 | channel_triggers_ht_node); | |
4186 | cds_list_for_each_entry(trigger_list_element, &trigger_list->list, | |
e742b055 | 4187 | node) { |
9b63a4aa | 4188 | const struct lttng_condition *condition; |
f2b3ef9f | 4189 | struct lttng_trigger *trigger; |
505b2d90 | 4190 | struct notification_client_list *client_list = NULL; |
ab0ee2ca | 4191 | struct lttng_evaluation *evaluation = NULL; |
f2b3ef9f | 4192 | enum action_executor_status executor_status; |
ab0ee2ca | 4193 | |
505b2d90 | 4194 | ret = 0; |
ab0ee2ca | 4195 | trigger = trigger_list_element->trigger; |
9b63a4aa | 4196 | condition = lttng_trigger_get_const_condition(trigger); |
ab0ee2ca | 4197 | assert(condition); |
ab0ee2ca JG |
4198 | |
4199 | /* | |
4200 | * Check if any client is subscribed to the result of this | |
4201 | * evaluation. | |
4202 | */ | |
ed327204 | 4203 | client_list = get_client_list_from_condition(state, condition); |
ab0ee2ca | 4204 | |
ed327204 | 4205 | ret = evaluate_buffer_condition(condition, &evaluation, state, |
ab0ee2ca | 4206 | previous_sample_available ? &previous_sample : NULL, |
e8360425 JD |
4207 | &latest_sample, |
4208 | previous_session_consumed_total, | |
4209 | latest_session_consumed_total, | |
4210 | channel_info); | |
4211 | if (caa_unlikely(ret)) { | |
505b2d90 | 4212 | goto put_list; |
ab0ee2ca JG |
4213 | } |
4214 | ||
e8360425 | 4215 | if (caa_likely(!evaluation)) { |
505b2d90 | 4216 | goto put_list; |
ab0ee2ca JG |
4217 | } |
4218 | ||
f8522f5c JR |
4219 | if (!lttng_trigger_should_fire(trigger)) { |
4220 | goto put_list; | |
4221 | } | |
4222 | ||
4223 | lttng_trigger_fire(trigger); | |
4224 | ||
f2b3ef9f JG |
4225 | /* |
4226 | * Ownership of `evaluation` transferred to the action executor | |
4227 | * no matter the result. | |
4228 | */ | |
4229 | executor_status = action_executor_enqueue(state->executor, | |
4230 | trigger, evaluation, &channel_creds, | |
4231 | client_list); | |
4232 | evaluation = NULL; | |
4233 | switch (executor_status) { | |
4234 | case ACTION_EXECUTOR_STATUS_OK: | |
4235 | break; | |
4236 | case ACTION_EXECUTOR_STATUS_ERROR: | |
4237 | case ACTION_EXECUTOR_STATUS_INVALID: | |
4238 | /* | |
4239 | * TODO Add trigger identification (name/id) when | |
4240 | * it is added to the API. | |
4241 | */ | |
4242 | ERR("Fatal error occurred while enqueuing action associated with buffer-condition trigger"); | |
4243 | ret = -1; | |
4244 | goto put_list; | |
4245 | case ACTION_EXECUTOR_STATUS_OVERFLOW: | |
4246 | /* | |
4247 | * TODO Add trigger identification (name/id) when | |
4248 | * it is added to the API. | |
4249 | * | |
4250 | * Not a fatal error. | |
4251 | */ | |
4252 | WARN("No space left when enqueuing action associated with buffer-condition trigger"); | |
4253 | ret = 0; | |
4254 | goto put_list; | |
4255 | default: | |
4256 | abort(); | |
4257 | } | |
4258 | ||
505b2d90 JG |
4259 | put_list: |
4260 | notification_client_list_put(client_list); | |
e0b5f87b | 4261 | if (caa_unlikely(ret)) { |
505b2d90 | 4262 | break; |
ab0ee2ca JG |
4263 | } |
4264 | } | |
4265 | end_unlock: | |
4266 | rcu_read_unlock(); | |
4267 | end: | |
4268 | return ret; | |
4269 | } |