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8abe313a | 1 | /* |
ab5be9fa | 2 | * Copyright (C) 2017 Jérémie Galarneau <jeremie.galarneau@efficios.com> |
8abe313a | 3 | * |
ab5be9fa | 4 | * SPDX-License-Identifier: GPL-2.0-only |
8abe313a | 5 | * |
8abe313a JG |
6 | */ |
7 | ||
8 | #ifndef NOTIFICATION_THREAD_INTERNAL_H | |
9 | #define NOTIFICATION_THREAD_INTERNAL_H | |
10 | ||
c9e313bc SM |
11 | #include <common/compat/socket.hpp> |
12 | #include <common/credentials.hpp> | |
13 | #include <common/payload.hpp> | |
14 | #include <lttng/notification/channel-internal.hpp> | |
15 | #include <lttng/ref-internal.hpp> | |
f2b3ef9f | 16 | #include <stdbool.h> |
ae0a823f | 17 | #include <unistd.h> |
f2b3ef9f JG |
18 | #include <urcu/rculfhash.h> |
19 | #include <urcu/ref.h> | |
20 | #include <urcu/call-rcu.h> | |
c9e313bc | 21 | #include "notification-thread.hpp" |
f2b3ef9f JG |
22 | |
23 | struct lttng_evaluation; | |
24 | struct notification_thread_handle; | |
8abe313a JG |
25 | |
26 | struct channel_key { | |
27 | uint64_t key; | |
28 | enum lttng_domain_type domain; | |
29 | }; | |
30 | ||
319dcddc JG |
31 | struct session_state_sample { |
32 | uint64_t consumed_data_size; | |
33 | struct { | |
34 | /* Whether a rotation is ongoing for this session. */ | |
35 | bool ongoing; | |
36 | /* Identifier of the currently ongoing rotation. */ | |
37 | uint64_t id; | |
38 | /* Location of last completed rotation. */ | |
39 | struct lttng_trace_archive_location *location; | |
40 | } rotation; | |
41 | }; | |
42 | ||
8abe313a JG |
43 | struct session_info { |
44 | struct lttng_ref ref; | |
139a8d25 | 45 | uint64_t id; |
8abe313a JG |
46 | char *name; |
47 | uid_t uid; | |
48 | gid_t gid; | |
49 | /* | |
c7283958 | 50 | * Hashtable containing back-refs (weak) to all channels in this session. |
8abe313a JG |
51 | * The hashtable's key is a hash of (struct channel_key) and |
52 | * the value is of type (struct channel_info *). | |
53 | */ | |
54 | struct cds_lfht *channel_infos_ht; | |
ea9a44f0 | 55 | struct lttng_session_trigger_list *trigger_list; |
8abe313a JG |
56 | /* Node in the notification thread state's sessions_ht. */ |
57 | struct cds_lfht_node sessions_ht_node; | |
1eee26c5 JG |
58 | /* |
59 | * Weak reference to the thread state's sessions_ht. Used for removal on | |
60 | * destruction. | |
61 | */ | |
62 | struct cds_lfht *sessions_ht; | |
319dcddc JG |
63 | /* Session's state as of the latest update. */ |
64 | struct session_state_sample last_state_sample; | |
83b934ad MD |
65 | /* call_rcu delayed reclaim. */ |
66 | struct rcu_head rcu_node; | |
8abe313a JG |
67 | }; |
68 | ||
69 | struct channel_info { | |
70 | struct channel_key key; | |
71 | char *name; | |
72 | uint64_t capacity; | |
73 | /* | |
74 | * A channel info holds a reference (lttng_ref) on session_info. | |
75 | * session_info, in return, holds a weak reference to the channel. | |
76 | */ | |
77 | struct session_info *session_info; | |
78 | /* Node in the notification thread state's channels_ht. */ | |
79 | struct cds_lfht_node channels_ht_node; | |
80 | /* Node in the session_info's channels_ht. */ | |
81 | struct cds_lfht_node session_info_channels_ht_node; | |
83b934ad MD |
82 | /* call_rcu delayed reclaim. */ |
83 | struct rcu_head rcu_node; | |
8abe313a JG |
84 | }; |
85 | ||
b9a8d78f FD |
86 | /* |
87 | * Facilities to carry the different notifications type in the action | |
88 | * processing code path. | |
89 | */ | |
90 | struct lttng_event_notifier_notification { | |
91 | uint64_t tracer_token; | |
92 | enum lttng_domain_type type; | |
82b3cbf4 JR |
93 | size_t capture_buf_size; |
94 | char *capture_buffer; | |
b9a8d78f FD |
95 | }; |
96 | ||
f2b3ef9f JG |
97 | struct notification_client_list_element { |
98 | struct notification_client *client; | |
99 | struct cds_list_head node; | |
100 | }; | |
101 | ||
102 | /* | |
103 | * Thread safety of notification_client and notification_client_list. | |
104 | * | |
105 | * The notification thread (main thread) and the action executor | |
106 | * interact through client lists. Hence, when the action executor | |
107 | * thread looks-up the list of clients subscribed to a given | |
108 | * condition, it will acquire a reference to the list and lock it | |
109 | * while attempting to communicate with the various clients. | |
110 | * | |
111 | * It is not necessary to reference-count clients as they are guaranteed | |
112 | * to be 'alive' if they are present in a list and that list is locked. Indeed, | |
113 | * removing references to the client from those subscription lists is part of | |
114 | * the work performed on destruction of a client. | |
115 | * | |
116 | * No provision for other access scenarios are taken into account; | |
117 | * this is the bare minimum to make these accesses safe and the | |
118 | * notification thread's state is _not_ "thread-safe" in any general | |
119 | * sense. | |
120 | */ | |
121 | struct notification_client_list { | |
122 | pthread_mutex_t lock; | |
123 | struct urcu_ref ref; | |
091fa780 | 124 | struct lttng_condition *condition; |
57644a7f | 125 | /* List of triggers that have an identical condition than `condition`. */ |
091fa780 FD |
126 | struct cds_list_head triggers_list; |
127 | struct cds_list_head clients_list; | |
f2b3ef9f JG |
128 | /* Weak reference to container. */ |
129 | struct cds_lfht *notification_trigger_clients_ht; | |
130 | struct cds_lfht_node notification_trigger_clients_ht_node; | |
131 | /* call_rcu delayed reclaim. */ | |
132 | struct rcu_head rcu_node; | |
133 | }; | |
134 | ||
135 | struct notification_client { | |
6c24d3fd JG |
136 | /* |
137 | * Nests within the notification_client_list lock. | |
138 | * | |
139 | * Protects the outbound communication and the active flag which | |
140 | * is used by both the notification and action executor threads. | |
141 | * | |
142 | * The remaining fields of the object can be used without any | |
143 | * synchronization as they are either immutable (id, creds, version) or | |
144 | * only accessed by the notification thread. | |
145 | */ | |
f2b3ef9f JG |
146 | pthread_mutex_t lock; |
147 | notification_client_id id; | |
148 | int socket; | |
149 | /* Client protocol version. */ | |
150 | uint8_t major, minor; | |
151 | uid_t uid; | |
152 | gid_t gid; | |
f2bda80e | 153 | bool is_sessiond; |
f2b3ef9f JG |
154 | /* |
155 | * Indicates if the credentials and versions of the client have been | |
156 | * checked. | |
157 | */ | |
158 | bool validated; | |
159 | /* | |
160 | * Conditions to which the client's notification channel is subscribed. | |
161 | * List of struct lttng_condition_list_node. The condition member is | |
162 | * owned by the client. | |
163 | */ | |
164 | struct cds_list_head condition_list; | |
165 | struct cds_lfht_node client_socket_ht_node; | |
166 | struct cds_lfht_node client_id_ht_node; | |
167 | struct { | |
168 | /* | |
169 | * If a client's communication is inactive, it means that a | |
170 | * fatal error has occurred (could be either a protocol error or | |
171 | * the socket API returned a fatal error). No further | |
172 | * communication should be attempted; the client is queued for | |
173 | * clean-up. | |
174 | */ | |
175 | bool active; | |
9016dbfc | 176 | int current_poll_events; |
f2b3ef9f JG |
177 | struct { |
178 | /* | |
179 | * During the reception of a message, the reception | |
180 | * buffers' "size" is set to contain the current | |
181 | * message's complete payload. | |
182 | */ | |
882093ee | 183 | struct lttng_payload payload; |
f2b3ef9f JG |
184 | /* Bytes left to receive for the current message. */ |
185 | size_t bytes_to_receive; | |
882093ee JR |
186 | /* FDs left to receive for the current message. */ |
187 | int fds_to_receive; | |
f2b3ef9f JG |
188 | /* Type of the message being received. */ |
189 | enum lttng_notification_channel_message_type msg_type; | |
190 | /* | |
191 | * Indicates whether or not credentials are expected | |
192 | * from the client. | |
193 | */ | |
194 | bool expect_creds; | |
195 | /* | |
196 | * Indicates whether or not credentials were received | |
197 | * from the client. | |
198 | */ | |
199 | bool creds_received; | |
200 | /* Only used during credentials reception. */ | |
201 | lttng_sock_cred creds; | |
202 | } inbound; | |
203 | struct { | |
204 | /* | |
205 | * Indicates whether or not a notification addressed to | |
206 | * this client was dropped because a command reply was | |
207 | * already buffered. | |
208 | * | |
209 | * A notification is dropped whenever the buffer is not | |
210 | * empty. | |
211 | */ | |
212 | bool dropped_notification; | |
213 | /* | |
214 | * Indicates whether or not a command reply is already | |
215 | * buffered. In this case, it means that the client is | |
216 | * not consuming command replies before emitting a new | |
217 | * one. This could be caused by a protocol error or a | |
218 | * misbehaving/malicious client. | |
219 | */ | |
220 | bool queued_command_reply; | |
882093ee | 221 | struct lttng_payload payload; |
f2b3ef9f JG |
222 | } outbound; |
223 | } communication; | |
224 | /* call_rcu delayed reclaim. */ | |
225 | struct rcu_head rcu_node; | |
226 | }; | |
227 | ||
dd877ea6 JG |
228 | enum client_transmission_status { |
229 | CLIENT_TRANSMISSION_STATUS_COMPLETE, | |
230 | CLIENT_TRANSMISSION_STATUS_QUEUED, | |
231 | /* Communication failure. */ | |
232 | CLIENT_TRANSMISSION_STATUS_FAIL, | |
233 | /* Fatal error. */ | |
234 | CLIENT_TRANSMISSION_STATUS_ERROR, | |
235 | }; | |
f2b3ef9f | 236 | |
f2b3ef9f JG |
237 | bool notification_client_list_get(struct notification_client_list *list); |
238 | ||
f2b3ef9f JG |
239 | void notification_client_list_put(struct notification_client_list *list); |
240 | ||
6c24d3fd | 241 | /* Only returns a non-zero value if a fatal error occurred. */ |
e665dfbc JG |
242 | using report_client_transmission_result_cb = int (*)(struct notification_client *, |
243 | enum client_transmission_status, | |
244 | void *); | |
f2b3ef9f | 245 | |
f2b3ef9f JG |
246 | int notification_client_list_send_evaluation( |
247 | struct notification_client_list *list, | |
52d55cf9 | 248 | const struct lttng_trigger *trigger, |
f2b3ef9f | 249 | const struct lttng_evaluation *evaluation, |
f2b3ef9f JG |
250 | const struct lttng_credentials *source_object_creds, |
251 | report_client_transmission_result_cb client_report, | |
252 | void *user_data); | |
253 | ||
f2b3ef9f JG |
254 | int notification_thread_client_communication_update( |
255 | struct notification_thread_handle *handle, | |
256 | notification_client_id id, | |
257 | enum client_transmission_status transmission_status); | |
258 | ||
82b3cbf4 JR |
259 | /* |
260 | * Takes ownership of the payload if present. | |
261 | */ | |
b9a8d78f FD |
262 | struct lttng_event_notifier_notification *lttng_event_notifier_notification_create( |
263 | uint64_t tracer_token, | |
82b3cbf4 JR |
264 | enum lttng_domain_type domain, |
265 | char *payload, | |
266 | size_t payload_size); | |
b9a8d78f | 267 | |
b9a8d78f FD |
268 | void lttng_event_notifier_notification_destroy( |
269 | struct lttng_event_notifier_notification *event_notifier_notification); | |
270 | ||
8abe313a | 271 | #endif /* NOTIFICATION_THREAD_INTERNAL_H */ |