src/common/sessiond-comm/relayd.hpp

   1 /*
   2  * Copyright (C) 2012 David Goulet <dgoulet@efficios.com>
   3  * Copyright (C) 2012 Julien Desfossez <julien.desfossez@efficios.com>
   4  *
   5  * SPDX-License-Identifier: GPL-2.0-only
   6  *
   7  */
   8
   9 #ifndef _RELAYD_COMM
  10 #define _RELAYD_COMM
  11
  12 #include <limits.h>
  13 #include <stdint.h>
  14
  15 #include <lttng/lttng.h>
  16 #include <common/defaults.hpp>
  17 #include <common/index/ctf-index.hpp>
  18 #include <common/macros.hpp>
  19 #include <common/uuid.hpp>
  20 #include <common/optional.hpp>
  21
  22 #define RELAYD_VERSION_COMM_MAJOR             VERSION_MAJOR
  23 /* FIXME: remove, SPOOFING VERSION as 2.15 */
  24 //#define RELAYD_VERSION_COMM_MINOR             VERSION_MINOR
  25 #define RELAYD_VERSION_COMM_MINOR             15
  26
  27 #define RELAYD_COMM_LTTNG_HOST_NAME_MAX_2_4     64
  28 #define RELAYD_COMM_LTTNG_NAME_MAX_2_4  255
  29 #define RELAYD_COMM_LTTNG_PATH_MAX      4096
  30 #define RELAYD_COMM_DEFAULT_STREAM_NAME_LEN     264 /* 256 + 8 */
  31
  32 /*
  33  * lttng-relayd communication header.
  34  */
  35 struct lttcomm_relayd_hdr {
  36         /* Circuit ID not used for now so always ignored */
  37         uint64_t circuit_id;
  38         uint64_t data_size;             /* data size following this header */
  39         uint32_t cmd;                   /* enum lttcomm_relayd_command */
  40         uint32_t cmd_version;   /* command version */
  41 } LTTNG_PACKED;
  42
  43 /*
  44  * lttng-relayd data header.
  45  */
  46 struct lttcomm_relayd_data_hdr {
  47         /* Circuit ID not used for now so always ignored */
  48         uint64_t circuit_id;
  49         uint64_t stream_id;     /* Stream ID known by the relayd */
  50         uint64_t net_seq_num;   /* Network sequence number, per stream. */
  51         uint32_t data_size;     /* data size following this header */
  52         uint32_t padding_size;  /* Size of 0 padding the data */
  53 } LTTNG_PACKED;
  54
  55 /*
  56  * Reply from a create session command.
  57  */
  58 struct lttcomm_relayd_status_session {
  59         uint64_t session_id;
  60         uint32_t ret_code;
  61 } LTTNG_PACKED;
  62
  63 /*
  64  * Used to add a stream on the relay daemon.
  65  */
  66 struct lttcomm_relayd_add_stream {
  67         char channel_name[RELAYD_COMM_DEFAULT_STREAM_NAME_LEN];
  68         char pathname[RELAYD_COMM_LTTNG_PATH_MAX];
  69 } LTTNG_PACKED;
  70
  71 /*
  72  * Used to add a stream on the relay daemon.
  73  * Protocol version 2.2
  74  */
  75 struct lttcomm_relayd_add_stream_2_2 {
  76         char channel_name[RELAYD_COMM_DEFAULT_STREAM_NAME_LEN];
  77         char pathname[RELAYD_COMM_LTTNG_PATH_MAX];
  78         uint64_t tracefile_size;
  79         uint64_t tracefile_count;
  80 } LTTNG_PACKED;
  81
  82 struct lttcomm_relayd_add_stream_2_11 {
  83         uint32_t channel_name_len;
  84         uint32_t pathname_len;
  85         uint64_t tracefile_size;
  86         uint64_t tracefile_count;
  87         uint64_t trace_chunk_id;
  88         char names[];
  89 } LTTNG_PACKED;
  90
  91 /*
  92  * Answer from an add stream command.
  93  */
  94 struct lttcomm_relayd_status_stream {
  95         uint64_t handle;
  96         uint32_t ret_code;
  97 } LTTNG_PACKED;
  98
  99 /*
 100  * Used to return command code for command not needing special data.
 101  */
 102 struct lttcomm_relayd_generic_reply {
 103         uint32_t ret_code;
 104 } LTTNG_PACKED;
 105
 106 /*
 107  * Version command.
 108  */
 109 struct lttcomm_relayd_version {
 110         uint32_t major;
 111         uint32_t minor;
 112 } LTTNG_PACKED;
 113
 114 /*
 115  * Metadata payload used when metadata command is sent.
 116  */
 117 struct lttcomm_relayd_metadata_payload {
 118         uint64_t stream_id;
 119         uint32_t padding_size;
 120         char payload[];
 121 } LTTNG_PACKED;
 122
 123 /*
 124  * Used to indicate that a specific stream id can now be closed.
 125  */
 126 struct lttcomm_relayd_close_stream {
 127         uint64_t stream_id;
 128         uint64_t last_net_seq_num;      /* sequence number of last packet */
 129 } LTTNG_PACKED;
 130
 131 /*
 132  * Used to test if for a given stream id the data is pending on the relayd side
 133  * for reading.
 134  */
 135 struct lttcomm_relayd_data_pending {
 136         uint64_t stream_id;
 137         uint64_t last_net_seq_num; /* Sequence number of the last packet */
 138 } LTTNG_PACKED;
 139
 140 struct lttcomm_relayd_begin_data_pending {
 141         uint64_t session_id;
 142 } LTTNG_PACKED;
 143
 144 struct lttcomm_relayd_end_data_pending {
 145         uint64_t session_id;
 146 } LTTNG_PACKED;
 147
 148 struct lttcomm_relayd_quiescent_control {
 149         uint64_t stream_id;
 150 } LTTNG_PACKED;
 151
 152 /*
 153  * Index data.
 154  */
 155 struct lttcomm_relayd_index {
 156         uint64_t relay_stream_id;
 157         uint64_t net_seq_num;
 158         uint64_t packet_size;
 159         uint64_t content_size;
 160         uint64_t timestamp_begin;
 161         uint64_t timestamp_end;
 162         uint64_t events_discarded;
 163         uint64_t stream_id;
 164         /* 2.8+ */
 165         uint64_t stream_instance_id;
 166         uint64_t packet_seq_num;
 167 } LTTNG_PACKED;
 168
 169 static inline size_t lttcomm_relayd_index_len(uint32_t major, uint32_t minor)
 170 {
 171         if (major == 1) {
 172                 switch (minor) {
 173                 case 0:
 174                         return offsetof(struct lttcomm_relayd_index, stream_id)
 175                                 + member_sizeof(struct lttcomm_relayd_index,
 176                                                 stream_id);
 177                 case 1:
 178                         return offsetof(struct lttcomm_relayd_index, packet_seq_num)
 179                                 + member_sizeof(struct lttcomm_relayd_index,
 180                                                 packet_seq_num);
 181                 default:
 182                         abort();
 183                 }
 184         }
 185         abort();
 186 }
 187
 188 /*
 189  * Create session in 2.4 adds additionnal parameters for live reading.
 190  */
 191 struct lttcomm_relayd_create_session_2_4 {
 192         char session_name[RELAYD_COMM_LTTNG_NAME_MAX_2_4];
 193         char hostname[RELAYD_COMM_LTTNG_HOST_NAME_MAX_2_4];
 194         uint32_t live_timer;
 195         uint32_t snapshot;
 196 } LTTNG_PACKED;
 197
 198 struct lttcomm_relayd_create_session_2_11 {
 199         uint32_t session_name_len;
 200         uint32_t hostname_len;
 201         /* Optional, set to 0 to indicate it is not user-specified. */
 202         uint32_t base_path_len;
 203         uint32_t live_timer;
 204         uint8_t snapshot;
 205         uint8_t session_name_contains_creation_time;
 206         /* Sessiond instance UUID */
 207         uint8_t sessiond_uuid[LTTNG_UUID_LEN];
 208         /* Sessiond session id */
 209         uint64_t session_id;
 210         /* Session creation time, in seconds since UNIX Epoch. */
 211         uint64_t creation_time;
 212         LTTNG_OPTIONAL_COMM(uint64_t) LTTNG_PACKED current_chunk_id;
 213         /* Contains the session_name, hostname, base_path. */
 214         char names[];
 215 } LTTNG_PACKED;
 216
 217 struct lttcomm_relayd_create_session_reply_2_11 {
 218         struct lttcomm_relayd_status_session generic;
 219         /* Includes the '\0' terminator. */
 220         uint32_t output_path_length;
 221         char output_path[];
 222 } LTTNG_PACKED;
 223
 224 /*
 225  * Used to ask the relay to reset the metadata trace file (regeneration).
 226  * Send the new version of the metadata (starts at 0).
 227  */
 228 struct lttcomm_relayd_reset_metadata {
 229         uint64_t stream_id;
 230         uint64_t version;
 231 } LTTNG_PACKED;
 232
 233 struct lttcomm_relayd_stream_rotation_position {
 234         uint64_t stream_id;
 235         /*
 236          * Sequence number of the first packet belonging to the new
 237          * "destination" trace chunk to which the stream is rotating.
 238          *
 239          * Ignored for metadata streams.
 240          */
 241         uint64_t rotate_at_seq_num;
 242 } LTTNG_PACKED;
 243
 244 /*
 245  * For certain releases, the LTTNG_PACKED annotation was missing on the
 246  * `new_chunk_id` field which causes padding to be added between the
 247  * "optional" structure's `is_set` and `value` fields.
 248  *
 249  * Three alignment cases are handled:
 250  *   - `value` is aligned to the next byte boundary after `is_set`
 251  *     no padding is produced, see
 252  *     `struct lttcomm_relayd_rotate_streams_packed`,
 253  *   - `value` is aligned to the next 4-byte boundary after `is_set`
 254  *     (e.g. x86), 3 bytes of padding are produced, see
 255  *     `struct lttcomm_relayd_rotate_streams_3_bytes_padding`,
 256  *   - `value` is aligned to the next 8-byte boundary after `is_set`
 257  *     (e.g. x86-64), 7 bytes of padding are produced, see
 258  *     `struct lttcomm_relayd_rotate_streams_7_bytes_padding`.
 259  *
 260  * Note that since this structure's advertised size is used to determine
 261  * the size of the padding it includes, it can't be extended with new
 262  * optional fields. A new command would be needed.
 263  */
 264 struct lttcomm_relayd_rotate_streams {
 265         uint32_t stream_count;
 266         /*
 267          * Streams can be rotated outside of a chunk but not be parented to
 268          * a new chunk.
 269          *
 270          * Improperly packed, but left as-is for backwards compatibility
 271          * with unpatched relay daemons.
 272          */
 273         LTTNG_OPTIONAL_COMM(uint64_t) new_chunk_id;
 274         /* `stream_count` positions follow. */
 275         struct lttcomm_relayd_stream_rotation_position rotation_positions[];
 276 } LTTNG_PACKED;
 277
 278 struct lttcomm_relayd_rotate_streams_packed {
 279         uint32_t stream_count;
 280         LTTNG_OPTIONAL_COMM(uint64_t) LTTNG_PACKED new_chunk_id;
 281         struct lttcomm_relayd_stream_rotation_position rotation_positions[];
 282 } LTTNG_PACKED;
 283
 284 struct lttcomm_relayd_rotate_streams_3_bytes_padding {
 285         uint32_t stream_count;
 286         struct {
 287                 union {
 288                         uint8_t is_set;
 289                         uint32_t padding;
 290                 };
 291                 uint64_t value;
 292         } LTTNG_PACKED new_chunk_id;
 293         struct lttcomm_relayd_stream_rotation_position rotation_positions[];
 294 } LTTNG_PACKED;
 295
 296 struct lttcomm_relayd_rotate_streams_7_bytes_padding {
 297         uint32_t stream_count;
 298         struct {
 299                 union {
 300                         uint8_t is_set;
 301                         uint64_t padding;
 302                 };
 303                 uint64_t value;
 304         } LTTNG_PACKED new_chunk_id;
 305         struct lttcomm_relayd_stream_rotation_position rotation_positions[];
 306 } LTTNG_PACKED;
 307
 308 struct lttcomm_relayd_create_trace_chunk {
 309         uint64_t chunk_id;
 310         /* Seconds since EPOCH. */
 311         uint64_t creation_timestamp;
 312         /* Includes trailing NULL. */
 313         uint32_t override_name_length;
 314         char override_name[];
 315 } LTTNG_PACKED;
 316
 317 struct lttcomm_relayd_close_trace_chunk {
 318         uint64_t chunk_id;
 319         /* Seconds since EPOCH. */
 320         uint64_t close_timestamp;
 321         /* enum lttng_trace_chunk_command_type */
 322         LTTNG_OPTIONAL_COMM(uint32_t) LTTNG_PACKED close_command;
 323 } LTTNG_PACKED;
 324
 325 struct lttcomm_relayd_close_trace_chunk_reply {
 326         struct lttcomm_relayd_generic_reply generic;
 327         /* Includes trailing NULL. */
 328         uint32_t path_length;
 329         char path[];
 330 } LTTNG_PACKED;
 331
 332 struct lttcomm_relayd_trace_chunk_exists {
 333         uint64_t chunk_id;
 334 } LTTNG_PACKED;
 335
 336 struct lttcomm_relayd_trace_chunk_exists_reply {
 337         struct lttcomm_relayd_generic_reply generic;
 338         uint8_t trace_chunk_exists;
 339 } LTTNG_PACKED;
 340
 341 enum lttcomm_relayd_configuration_flag {
 342         /* The relay daemon (2.12) is configured to allow clear operations. */
 343         LTTCOMM_RELAYD_CONFIGURATION_FLAG_CLEAR_ALLOWED = (1 << 0),
 344 };
 345
 346 enum lttcomm_relayd_configuration_query_flag {
 347         LTTCOMM_RELAYD_CONFIGURATION_QUERY_FLAG_SUPPORTED_TRACE_FORMAT = (1 << 0),
 348         LTTCOMM_RELAYD_CONFIGURATION_QUERY_FLAG_MASK = 0x01
 349 };
 350
 351 enum lttcomm_relayd_configuration_trace_format_flag {
 352         LTTCOMM_RELAYD_CONFIGURATION_TRACE_FORMAT_SUPPORTED_CTF1 = (1 << 0),
 353         LTTCOMM_RELAYD_CONFIGURATION_TRACE_FORMAT_SUPPORTED_CTF2 = (1 << 1)
 354 };
 355
 356 struct lttcomm_relayd_get_configuration {
 357         uint64_t query_flags;
 358 } LTTNG_PACKED;
 359
 360 struct lttcomm_relayd_get_configuration_specialized_query_reply {
 361         uint64_t query_flag; // Single flag, enum lttcomm_relayd_configuration_trace_format_flag
 362         uint64_t payload_len;
 363         /*
 364          * Payload dependant on type
 365          * LTTCOMM_RELAYD_CONFIGURATION_QUERY_FLAG_SUPPORTED_TRACE_FORMAT:
 366          *    uint64_t, bitfield of lttcomm_relayd_configuration_trace_format_flag.
 367          */
 368         char payload[];
 369 } LTTNG_PACKED;
 370 /*
 371  * Used to return a relay daemon's configuration in reply to the
 372  * RELAYD_GET_CONFIGURATION command.
 373  */
 374 struct lttcomm_relayd_get_configuration_reply {
 375         struct lttcomm_relayd_generic_reply generic;
 376         /* Set of lttcomm_relayd_configuration_flag. */
 377         uint64_t relayd_configuration_flags;
 378         /*
 379          * Optional variable-length payload.
 380          * When N query flags are used, it is expected that N dynamic sized
 381          * lttcomm_relayd_get_configuration_specialized_query_reply be present.
 382          */
 383         char payload[];
 384 } LTTNG_PACKED;
 385
 386 #endif  /* _RELAYD_COMM */