src/vnet/session/session.h

   1 /*
   2  * Copyright (c) 2017 Cisco and/or its affiliates.
   3  * Licensed under the Apache License, Version 2.0 (the "License");
   4  * you may not use this file except in compliance with the License.
   5  * You may obtain a copy of the License at:
   6  *
   7  *     http://www.apache.org/licenses/LICENSE-2.0
   8  *
   9  * Unless required by applicable law or agreed to in writing, software
  10  * distributed under the License is distributed on an "AS IS" BASIS,
  11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12  * See the License for the specific language governing permissions and
  13  * limitations under the License.
  14  */
  15 #ifndef __included_session_h__
  16 #define __included_session_h__
  17
  18 #include <vnet/session/transport.h>
  19 #include <vlibmemory/unix_shared_memory_queue.h>
  20 #include <vnet/session/session_debug.h>
  21 #include <vnet/session/segment_manager.h>
  22
  23 #define HALF_OPEN_LOOKUP_INVALID_VALUE ((u64)~0)
  24 #define INVALID_INDEX ((u32)~0)
  25
  26 /* TODO decide how much since we have pre-data as well */
  27 #define MAX_HDRS_LEN    100     /* Max number of bytes for headers */
  28
  29 typedef enum
  30 {
  31   FIFO_EVENT_APP_RX,
  32   FIFO_EVENT_APP_TX,
  33   FIFO_EVENT_TIMEOUT,
  34   FIFO_EVENT_DISCONNECT,
  35   FIFO_EVENT_BUILTIN_RX
  36 } fifo_event_type_t;
  37
  38 #define foreach_session_input_error                                     \
  39 _(NO_SESSION, "No session drops")                                       \
  40 _(NO_LISTENER, "No listener for dst port drops")                        \
  41 _(ENQUEUED, "Packets pushed into rx fifo")                              \
  42 _(NOT_READY, "Session not ready packets")                               \
  43 _(FIFO_FULL, "Packets dropped for lack of rx fifo space")               \
  44 _(EVENT_FIFO_FULL, "Events not sent for lack of event fifo space")      \
  45 _(API_QUEUE_FULL, "Sessions not created for lack of API queue space")   \
  46 _(NEW_SEG_NO_SPACE, "Created segment, couldn't allocate a fifo pair")   \
  47 _(NO_SPACE, "Couldn't allocate a fifo pair")
  48
  49 typedef enum
  50 {
  51 #define _(sym,str) SESSION_ERROR_##sym,
  52   foreach_session_input_error
  53 #undef _
  54     SESSION_N_ERROR,
  55 } session_error_t;
  56
  57 /* Event queue input node static next indices */
  58 typedef enum
  59 {
  60   SESSION_QUEUE_NEXT_DROP,
  61   SESSION_QUEUE_NEXT_TCP_IP4_OUTPUT,
  62   SESSION_QUEUE_NEXT_IP4_LOOKUP,
  63   SESSION_QUEUE_NEXT_TCP_IP6_OUTPUT,
  64   SESSION_QUEUE_NEXT_IP6_LOOKUP,
  65   SESSION_QUEUE_N_NEXT,
  66 } session_queue_next_t;
  67
  68 #define foreach_session_type                    \
  69   _(IP4_TCP, ip4_tcp)                           \
  70   _(IP4_UDP, ip4_udp)                           \
  71   _(IP6_TCP, ip6_tcp)                           \
  72   _(IP6_UDP, ip6_udp)
  73
  74 typedef enum
  75 {
  76 #define _(A, a) SESSION_TYPE_##A,
  77   foreach_session_type
  78 #undef _
  79     SESSION_N_TYPES,
  80 } session_type_t;
  81
  82 /*
  83  * Application session state
  84  */
  85 typedef enum
  86 {
  87   SESSION_STATE_LISTENING,
  88   SESSION_STATE_CONNECTING,
  89   SESSION_STATE_READY,
  90   SESSION_STATE_CLOSED,
  91   SESSION_STATE_N_STATES,
  92 } stream_session_state_t;
  93
  94 /* *INDENT-OFF* */
  95 typedef CLIB_PACKED (struct {
  96   union
  97     {
  98       svm_fifo_t * fifo;
  99       u64 session_handle;
 100     };
 101   u8 event_type;
 102   u16 event_id;
 103 }) session_fifo_event_t;
 104 /* *INDENT-ON* */
 105
 106 typedef struct _stream_session_t
 107 {
 108   /** fifo pointers. Once allocated, these do not move */
 109   svm_fifo_t *server_rx_fifo;
 110   svm_fifo_t *server_tx_fifo;
 111
 112   /** svm segment index where fifos were allocated */
 113   u32 svm_segment_index;
 114
 115   /** Type */
 116   u8 session_type;
 117
 118   /** State */
 119   u8 session_state;
 120
 121   u8 thread_index;
 122
 123   /** used during unbind processing */
 124   u8 is_deleted;
 125
 126   /** To avoid n**2 "one event per frame" check */
 127   u8 enqueue_epoch;
 128
 129   /** Session index in per_thread pool */
 130   u32 session_index;
 131
 132   /** Transport specific */
 133   u32 connection_index;
 134
 135   /** Application specific */
 136   u32 pid;
 137
 138   /** stream server pool index */
 139   u32 app_index;
 140
 141   /** Parent listener session if the result of an accept */
 142   u32 listener_index;
 143 } stream_session_t;
 144
 145 /* Forward definition */
 146 typedef struct _session_manager_main session_manager_main_t;
 147
 148 typedef int
 149   (session_fifo_rx_fn) (vlib_main_t * vm, vlib_node_runtime_t * node,
 150                         session_manager_main_t * smm,
 151                         session_fifo_event_t * e0, stream_session_t * s0,
 152                         u32 thread_index, int *n_tx_pkts);
 153
 154 extern session_fifo_rx_fn session_tx_fifo_peek_and_snd;
 155 extern session_fifo_rx_fn session_tx_fifo_dequeue_and_snd;
 156
 157 struct _session_manager_main
 158 {
 159   /** Lookup tables for established sessions and listeners */
 160   clib_bihash_16_8_t v4_session_hash;
 161   clib_bihash_48_8_t v6_session_hash;
 162
 163   /** Lookup tables for half-open sessions */
 164   clib_bihash_16_8_t v4_half_open_hash;
 165   clib_bihash_48_8_t v6_half_open_hash;
 166
 167   /** Per worker thread session pools */
 168   stream_session_t **sessions;
 169
 170   /** Pool of listen sessions. Same type as stream sessions to ease lookups */
 171   stream_session_t *listen_sessions[SESSION_N_TYPES];
 172
 173   /** Sparse vector to map dst port to stream server  */
 174   u16 *stream_server_by_dst_port[SESSION_N_TYPES];
 175
 176   /** per-worker enqueue epoch counters */
 177   u8 *current_enqueue_epoch;
 178
 179   /** Per-worker thread vector of sessions to enqueue */
 180   u32 **session_indices_to_enqueue_by_thread;
 181
 182   /** per-worker tx buffer free lists */
 183   u32 **tx_buffers;
 184
 185   /** Per worker-thread vector of partially read events */
 186   session_fifo_event_t **evts_partially_read;
 187
 188   /** per-worker active event vectors */
 189   session_fifo_event_t **fifo_events;
 190
 191   /** vpp fifo event queue */
 192   unix_shared_memory_queue_t **vpp_event_queues;
 193
 194   /** Unique segment name counter */
 195   u32 unique_segment_name_counter;
 196
 197   /** Per transport rx function that can either dequeue or peek */
 198   session_fifo_rx_fn *session_tx_fns[SESSION_N_TYPES];
 199
 200   u8 is_enabled;
 201
 202   /* Convenience */
 203   vlib_main_t *vlib_main;
 204   vnet_main_t *vnet_main;
 205
 206 #if SESSION_DBG
 207   /**
 208    * last event poll time by thread
 209    * Debug only. Will cause false cache-line sharing as-is
 210    */
 211   f64 *last_event_poll_by_thread;
 212 #endif
 213
 214 };
 215
 216 extern session_manager_main_t session_manager_main;
 217 extern vlib_node_registration_t session_queue_node;
 218
 219 /*
 220  * Session manager function
 221  */
 222 always_inline session_manager_main_t *
 223 vnet_get_session_manager_main ()
 224 {
 225   return &session_manager_main;
 226 }
 227
 228 /*
 229  * Stream session functions
 230  */
 231
 232 stream_session_t *stream_session_lookup_listener4 (ip4_address_t * lcl,
 233                                                    u16 lcl_port, u8 proto);
 234 stream_session_t *stream_session_lookup4 (ip4_address_t * lcl,
 235                                           ip4_address_t * rmt, u16 lcl_port,
 236                                           u16 rmt_port, u8 proto,
 237                                           u32 thread_index);
 238 stream_session_t *stream_session_lookup_listener6 (ip6_address_t * lcl,
 239                                                    u16 lcl_port, u8 proto);
 240 stream_session_t *stream_session_lookup6 (ip6_address_t * lcl,
 241                                           ip6_address_t * rmt, u16 lcl_port,
 242                                           u16 rmt_port, u8, u32 thread_index);
 243 transport_connection_t
 244   * stream_session_lookup_transport4 (ip4_address_t * lcl,
 245                                       ip4_address_t * rmt, u16 lcl_port,
 246                                       u16 rmt_port, u8 proto,
 247                                       u32 thread_index);
 248 transport_connection_t
 249   * stream_session_lookup_transport6 (ip6_address_t * lcl,
 250                                       ip6_address_t * rmt, u16 lcl_port,
 251                                       u16 rmt_port, u8 proto,
 252                                       u32 thread_index);
 253 stream_session_t *stream_session_lookup_listener (ip46_address_t * lcl,
 254                                                   u16 lcl_port, u8 proto);
 255 void stream_session_table_add_for_tc (transport_connection_t * tc, u64 value);
 256 int stream_session_table_del_for_tc (transport_connection_t * tc);
 257
 258 always_inline stream_session_t *
 259 stream_session_get_tsi (u64 ti_and_si, u32 thread_index)
 260 {
 261   ASSERT ((u32) (ti_and_si >> 32) == thread_index);
 262   return pool_elt_at_index (session_manager_main.sessions[thread_index],
 263                             ti_and_si & 0xFFFFFFFFULL);
 264 }
 265
 266 always_inline stream_session_t *
 267 stream_session_get (u32 si, u32 thread_index)
 268 {
 269   return pool_elt_at_index (session_manager_main.sessions[thread_index], si);
 270 }
 271
 272 always_inline stream_session_t *
 273 stream_session_get_if_valid (u64 si, u32 thread_index)
 274 {
 275   if (thread_index >= vec_len (session_manager_main.sessions))
 276     return 0;
 277
 278   if (pool_is_free_index (session_manager_main.sessions[thread_index], si))
 279     return 0;
 280
 281   return pool_elt_at_index (session_manager_main.sessions[thread_index], si);
 282 }
 283
 284 always_inline u64
 285 stream_session_handle (stream_session_t * s)
 286 {
 287   return ((u64) s->thread_index << 32) | (u64) s->session_index;
 288 }
 289
 290 always_inline u32
 291 stream_session_index_from_handle (u64 handle)
 292 {
 293   return handle & 0xFFFFFFFF;
 294 }
 295
 296 always_inline u32
 297 stream_session_thread_from_handle (u64 handle)
 298 {
 299   return handle >> 32;
 300 }
 301
 302 always_inline void
 303 stream_session_parse_handle (u64 handle, u32 * index, u32 * thread_index)
 304 {
 305   *index = stream_session_index_from_handle (handle);
 306   *thread_index = stream_session_thread_from_handle (handle);
 307 }
 308
 309 always_inline stream_session_t *
 310 stream_session_get_from_handle (u64 handle)
 311 {
 312   session_manager_main_t *smm = &session_manager_main;
 313   return pool_elt_at_index (smm->sessions[stream_session_thread_from_handle
 314                                           (handle)],
 315                             stream_session_index_from_handle (handle));
 316 }
 317
 318 always_inline stream_session_t *
 319 stream_session_listener_get (u8 sst, u64 si)
 320 {
 321   return pool_elt_at_index (session_manager_main.listen_sessions[sst], si);
 322 }
 323
 324 always_inline u32
 325 stream_session_get_index (stream_session_t * s)
 326 {
 327   if (s->session_state == SESSION_STATE_LISTENING)
 328     return s - session_manager_main.listen_sessions[s->session_type];
 329
 330   return s - session_manager_main.sessions[s->thread_index];
 331 }
 332
 333 always_inline u32
 334 stream_session_max_rx_enqueue (transport_connection_t * tc)
 335 {
 336   stream_session_t *s = stream_session_get (tc->s_index, tc->thread_index);
 337   return svm_fifo_max_enqueue (s->server_rx_fifo);
 338 }
 339
 340 always_inline u32
 341 stream_session_fifo_size (transport_connection_t * tc)
 342 {
 343   stream_session_t *s = stream_session_get (tc->s_index, tc->thread_index);
 344   return s->server_rx_fifo->nitems;
 345 }
 346
 347 int
 348 stream_session_enqueue_data (transport_connection_t * tc, u8 * data, u16 len,
 349                              u8 queue_event);
 350 u32
 351 stream_session_peek_bytes (transport_connection_t * tc, u8 * buffer,
 352                            u32 offset, u32 max_bytes);
 353 u32 stream_session_dequeue_drop (transport_connection_t * tc, u32 max_bytes);
 354
 355 void stream_session_connect_notify (transport_connection_t * tc, u8 sst,
 356                                     u8 is_fail);
 357 void stream_session_init_fifos_pointers (transport_connection_t * tc,
 358                                          u32 rx_pointer, u32 tx_pointer);
 359
 360 void stream_session_accept_notify (transport_connection_t * tc);
 361 void stream_session_disconnect_notify (transport_connection_t * tc);
 362 void stream_session_delete_notify (transport_connection_t * tc);
 363 void stream_session_reset_notify (transport_connection_t * tc);
 364 int
 365 stream_session_accept (transport_connection_t * tc, u32 listener_index,
 366                        u8 sst, u8 notify);
 367 int
 368 stream_session_open (u32 app_index, session_type_t st,
 369                      transport_endpoint_t * tep,
 370                      transport_connection_t ** tc);
 371 int stream_session_listen (stream_session_t * s, transport_endpoint_t * tep);
 372 int stream_session_stop_listen (stream_session_t * s);
 373 void stream_session_disconnect (stream_session_t * s);
 374 void stream_session_cleanup (stream_session_t * s);
 375 void session_send_session_evt_to_thread (u64 session_handle,
 376                                          fifo_event_type_t evt_type,
 377                                          u32 thread_index);
 378 u8 *format_stream_session (u8 * s, va_list * args);
 379
 380 void session_register_transport (u8 type, const transport_proto_vft_t * vft);
 381 transport_proto_vft_t *session_get_transport_vft (u8 type);
 382
 383 clib_error_t *vnet_session_enable_disable (vlib_main_t * vm, u8 is_en);
 384
 385 always_inline unix_shared_memory_queue_t *
 386 session_manager_get_vpp_event_queue (u32 thread_index)
 387 {
 388   return session_manager_main.vpp_event_queues[thread_index];
 389 }
 390
 391 int session_manager_flush_enqueue_events (u32 thread_index);
 392
 393 always_inline u64
 394 listen_session_get_handle (stream_session_t * s)
 395 {
 396   ASSERT (s->session_state == SESSION_STATE_LISTENING);
 397   return ((u64) s->session_type << 32) | s->session_index;
 398 }
 399
 400 always_inline stream_session_t *
 401 listen_session_get_from_handle (u64 handle)
 402 {
 403   session_manager_main_t *smm = &session_manager_main;
 404   stream_session_t *s;
 405   u32 type, index;
 406   type = handle >> 32;
 407   index = handle & 0xFFFFFFFF;
 408
 409   if (pool_is_free_index (smm->listen_sessions[type], index))
 410     return 0;
 411
 412   s = pool_elt_at_index (smm->listen_sessions[type], index);
 413   ASSERT (s->session_state == SESSION_STATE_LISTENING);
 414   return s;
 415 }
 416
 417 always_inline stream_session_t *
 418 listen_session_new (session_type_t type)
 419 {
 420   stream_session_t *s;
 421   pool_get (session_manager_main.listen_sessions[type], s);
 422   memset (s, 0, sizeof (*s));
 423
 424   s->session_type = type;
 425   s->session_state = SESSION_STATE_LISTENING;
 426   s->session_index = s - session_manager_main.listen_sessions[type];
 427
 428   return s;
 429 }
 430
 431 always_inline stream_session_t *
 432 listen_session_get (session_type_t type, u32 index)
 433 {
 434   return pool_elt_at_index (session_manager_main.listen_sessions[type],
 435                             index);
 436 }
 437
 438 always_inline void
 439 listen_session_del (stream_session_t * s)
 440 {
 441   pool_put (session_manager_main.listen_sessions[s->session_type], s);
 442 }
 443
 444 always_inline u8
 445 session_manager_is_enabled ()
 446 {
 447   return session_manager_main.is_enabled == 1;
 448 }
 449
 450 #endif /* __included_session_h__ */
 451
 452 /*
 453  * fd.io coding-style-patch-verification: ON
 454  *
 455  * Local Variables:
 456  * eval: (c-set-style "gnu")
 457  * End:
 458  */