session: add support for application namespacing
[vpp.git] / 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/stream_session.h>
19 #include <vnet/session/session_lookup.h>
20 #include <vnet/session/transport_interface.h>
21 #include <vlibmemory/unix_shared_memory_queue.h>
22 #include <vnet/session/session_debug.h>
23 #include <vnet/session/segment_manager.h>
24
25 #define HALF_OPEN_LOOKUP_INVALID_VALUE ((u64)~0)
26 #define INVALID_INDEX ((u32)~0)
27
28 /* TODO decide how much since we have pre-data as well */
29 #define MAX_HDRS_LEN    100     /* Max number of bytes for headers */
30
31 typedef enum
32 {
33   FIFO_EVENT_APP_RX,
34   FIFO_EVENT_APP_TX,
35   FIFO_EVENT_TIMEOUT,
36   FIFO_EVENT_DISCONNECT,
37   FIFO_EVENT_BUILTIN_RX,
38   FIFO_EVENT_RPC,
39 } fifo_event_type_t;
40
41 static inline const char *
42 fifo_event_type_str (fifo_event_type_t et)
43 {
44   switch (et)
45     {
46     case FIFO_EVENT_APP_RX:
47       return "FIFO_EVENT_APP_RX";
48     case FIFO_EVENT_APP_TX:
49       return "FIFO_EVENT_APP_TX";
50     case FIFO_EVENT_TIMEOUT:
51       return "FIFO_EVENT_TIMEOUT";
52     case FIFO_EVENT_DISCONNECT:
53       return "FIFO_EVENT_DISCONNECT";
54     case FIFO_EVENT_BUILTIN_RX:
55       return "FIFO_EVENT_BUILTIN_RX";
56     case FIFO_EVENT_RPC:
57       return "FIFO_EVENT_RPC";
58     default:
59       return "UNKNOWN FIFO EVENT";
60     }
61 }
62
63 #define foreach_session_input_error                                     \
64 _(NO_SESSION, "No session drops")                                       \
65 _(NO_LISTENER, "No listener for dst port drops")                        \
66 _(ENQUEUED, "Packets pushed into rx fifo")                              \
67 _(NOT_READY, "Session not ready packets")                               \
68 _(FIFO_FULL, "Packets dropped for lack of rx fifo space")               \
69 _(EVENT_FIFO_FULL, "Events not sent for lack of event fifo space")      \
70 _(API_QUEUE_FULL, "Sessions not created for lack of API queue space")   \
71 _(NEW_SEG_NO_SPACE, "Created segment, couldn't allocate a fifo pair")   \
72 _(NO_SPACE, "Couldn't allocate a fifo pair")
73
74 typedef enum
75 {
76 #define _(sym,str) SESSION_ERROR_##sym,
77   foreach_session_input_error
78 #undef _
79     SESSION_N_ERROR,
80 } session_error_t;
81
82 /* Event queue input node static next indices */
83 typedef enum
84 {
85   SESSION_QUEUE_NEXT_DROP,
86   SESSION_QUEUE_NEXT_TCP_IP4_OUTPUT,
87   SESSION_QUEUE_NEXT_IP4_LOOKUP,
88   SESSION_QUEUE_NEXT_TCP_IP6_OUTPUT,
89   SESSION_QUEUE_NEXT_IP6_LOOKUP,
90   SESSION_QUEUE_N_NEXT,
91 } session_queue_next_t;
92
93 typedef struct
94 {
95   void *fp;
96   void *arg;
97 } rpc_args_t;
98
99 /* *INDENT-OFF* */
100 typedef CLIB_PACKED (struct {
101   union
102     {
103       svm_fifo_t * fifo;
104       u64 session_handle;
105       rpc_args_t rpc_args;
106     };
107   u8 event_type;
108   u16 event_id;
109 }) session_fifo_event_t;
110 /* *INDENT-ON* */
111
112 /* Forward definition */
113 typedef struct _session_manager_main session_manager_main_t;
114
115 typedef int
116   (session_fifo_rx_fn) (vlib_main_t * vm, vlib_node_runtime_t * node,
117                         session_manager_main_t * smm,
118                         session_fifo_event_t * e0, stream_session_t * s0,
119                         u32 thread_index, int *n_tx_pkts);
120
121 extern session_fifo_rx_fn session_tx_fifo_peek_and_snd;
122 extern session_fifo_rx_fn session_tx_fifo_dequeue_and_snd;
123
124 u8 session_node_lookup_fifo_event (svm_fifo_t * f, session_fifo_event_t * e);
125
126 struct _session_manager_main
127 {
128   /** Per worker thread session pools */
129   stream_session_t **sessions;
130
131   /** Pool of listen sessions. Same type as stream sessions to ease lookups */
132   stream_session_t *listen_sessions[SESSION_N_TYPES];
133
134   /** Sparse vector to map dst port to stream server  */
135   u16 *stream_server_by_dst_port[SESSION_N_TYPES];
136
137   /** per-worker enqueue epoch counters */
138   u8 *current_enqueue_epoch;
139
140   /** Per-worker thread vector of sessions to enqueue */
141   u32 **session_indices_to_enqueue_by_thread;
142
143   /** per-worker tx buffer free lists */
144   u32 **tx_buffers;
145
146   /** Per worker-thread vector of partially read events */
147   session_fifo_event_t **free_event_vector;
148
149   /** per-worker active event vectors */
150   session_fifo_event_t **pending_event_vector;
151
152   /** vpp fifo event queue */
153   unix_shared_memory_queue_t **vpp_event_queues;
154
155   /** vpp fifo event queue configured length */
156   u32 configured_event_queue_length;
157
158   /** session table size parameters */
159   u32 configured_v4_session_table_buckets;
160   u32 configured_v4_session_table_memory;
161   u32 configured_v4_halfopen_table_buckets;
162   u32 configured_v4_halfopen_table_memory;
163   u32 configured_v6_session_table_buckets;
164   u32 configured_v6_session_table_memory;
165   u32 configured_v6_halfopen_table_buckets;
166   u32 configured_v6_halfopen_table_memory;
167
168   /** Unique segment name counter */
169   u32 unique_segment_name_counter;
170
171   /** Per transport rx function that can either dequeue or peek */
172   session_fifo_rx_fn *session_tx_fns[SESSION_N_TYPES];
173
174   /** Session manager is enabled */
175   u8 is_enabled;
176
177   /** Preallocate session config parameter */
178   u32 preallocated_sessions;
179
180 #if SESSION_DBG
181   /**
182    * last event poll time by thread
183    * Debug only. Will cause false cache-line sharing as-is
184    */
185   f64 *last_event_poll_by_thread;
186 #endif
187
188 };
189
190 extern session_manager_main_t session_manager_main;
191 extern vlib_node_registration_t session_queue_node;
192
193 /*
194  * Session manager function
195  */
196 always_inline session_manager_main_t *
197 vnet_get_session_manager_main ()
198 {
199   return &session_manager_main;
200 }
201
202 always_inline u8
203 stream_session_is_valid (u32 si, u8 thread_index)
204 {
205   stream_session_t *s;
206   s = pool_elt_at_index (session_manager_main.sessions[thread_index], si);
207   if (s->thread_index != thread_index || s->session_index != si
208       /* || s->server_rx_fifo->master_session_index != si
209          || s->server_tx_fifo->master_session_index != si
210          || s->server_rx_fifo->master_thread_index != thread_index
211          || s->server_tx_fifo->master_thread_index != thread_index */ )
212     return 0;
213   return 1;
214 }
215
216 always_inline stream_session_t *
217 session_get (u32 si, u32 thread_index)
218 {
219   ASSERT (stream_session_is_valid (si, thread_index));
220   return pool_elt_at_index (session_manager_main.sessions[thread_index], si);
221 }
222
223 always_inline stream_session_t *
224 stream_session_get_if_valid (u64 si, u32 thread_index)
225 {
226   if (thread_index >= vec_len (session_manager_main.sessions))
227     return 0;
228
229   if (pool_is_free_index (session_manager_main.sessions[thread_index], si))
230     return 0;
231
232   ASSERT (stream_session_is_valid (si, thread_index));
233   return pool_elt_at_index (session_manager_main.sessions[thread_index], si);
234 }
235
236 always_inline u64
237 stream_session_handle (stream_session_t * s)
238 {
239   return ((u64) s->thread_index << 32) | (u64) s->session_index;
240 }
241
242 always_inline u32
243 session_index_from_handle (u64 handle)
244 {
245   return handle & 0xFFFFFFFF;
246 }
247
248 always_inline u32
249 session_thread_from_handle (u64 handle)
250 {
251   return handle >> 32;
252 }
253
254 always_inline void
255 session_parse_handle (u64 handle, u32 * index, u32 * thread_index)
256 {
257   *index = session_index_from_handle (handle);
258   *thread_index = session_thread_from_handle (handle);
259 }
260
261 always_inline stream_session_t *
262 session_get_from_handle (u64 handle)
263 {
264   session_manager_main_t *smm = &session_manager_main;
265   return
266     pool_elt_at_index (smm->sessions[session_thread_from_handle (handle)],
267                        session_index_from_handle (handle));
268 }
269
270 always_inline stream_session_t *
271 stream_session_listener_get (u8 sst, u64 si)
272 {
273   return pool_elt_at_index (session_manager_main.listen_sessions[sst], si);
274 }
275
276 always_inline u32
277 stream_session_get_index (stream_session_t * s)
278 {
279   if (s->session_state == SESSION_STATE_LISTENING)
280     return s - session_manager_main.listen_sessions[s->session_type];
281
282   return s - session_manager_main.sessions[s->thread_index];
283 }
284
285 always_inline u32
286 stream_session_max_rx_enqueue (transport_connection_t * tc)
287 {
288   stream_session_t *s = session_get (tc->s_index, tc->thread_index);
289   return svm_fifo_max_enqueue (s->server_rx_fifo);
290 }
291
292 always_inline u32
293 stream_session_rx_fifo_size (transport_connection_t * tc)
294 {
295   stream_session_t *s = session_get (tc->s_index, tc->thread_index);
296   return s->server_rx_fifo->nitems;
297 }
298
299 u32 stream_session_tx_fifo_max_dequeue (transport_connection_t * tc);
300
301 int
302 stream_session_enqueue_data (transport_connection_t * tc, vlib_buffer_t * b,
303                              u32 offset, u8 queue_event, u8 is_in_order);
304 int
305 stream_session_peek_bytes (transport_connection_t * tc, u8 * buffer,
306                            u32 offset, u32 max_bytes);
307 u32 stream_session_dequeue_drop (transport_connection_t * tc, u32 max_bytes);
308
309 int stream_session_connect_notify (transport_connection_t * tc, u8 is_fail);
310 void stream_session_init_fifos_pointers (transport_connection_t * tc,
311                                          u32 rx_pointer, u32 tx_pointer);
312
313 void stream_session_accept_notify (transport_connection_t * tc);
314 void stream_session_disconnect_notify (transport_connection_t * tc);
315 void stream_session_delete_notify (transport_connection_t * tc);
316 void stream_session_reset_notify (transport_connection_t * tc);
317 int
318 stream_session_accept (transport_connection_t * tc, u32 listener_index,
319                        u8 notify);
320 int
321 stream_session_open (u32 app_index, session_endpoint_t * tep,
322                      transport_connection_t ** tc);
323 int stream_session_listen (stream_session_t * s, session_endpoint_t * tep);
324 int stream_session_stop_listen (stream_session_t * s);
325 void stream_session_disconnect (stream_session_t * s);
326 void stream_session_cleanup (stream_session_t * s);
327 void session_send_session_evt_to_thread (u64 session_handle,
328                                          fifo_event_type_t evt_type,
329                                          u32 thread_index);
330
331 u8 *format_stream_session (u8 * s, va_list * args);
332 uword unformat_stream_session (unformat_input_t * input, va_list * args);
333 uword unformat_transport_connection (unformat_input_t * input,
334                                      va_list * args);
335
336 int
337 send_session_connected_callback (u32 app_index, u32 api_context,
338                                  stream_session_t * s, u8 is_fail);
339
340
341 clib_error_t *vnet_session_enable_disable (vlib_main_t * vm, u8 is_en);
342
343 always_inline unix_shared_memory_queue_t *
344 session_manager_get_vpp_event_queue (u32 thread_index)
345 {
346   return session_manager_main.vpp_event_queues[thread_index];
347 }
348
349 int session_manager_flush_enqueue_events (u32 thread_index);
350
351 always_inline u64
352 listen_session_get_handle (stream_session_t * s)
353 {
354   ASSERT (s->session_state == SESSION_STATE_LISTENING);
355   return ((u64) s->session_type << 32) | s->session_index;
356 }
357
358 always_inline stream_session_t *
359 listen_session_get_from_handle (u64 handle)
360 {
361   session_manager_main_t *smm = &session_manager_main;
362   stream_session_t *s;
363   u32 type, index;
364   type = handle >> 32;
365   index = handle & 0xFFFFFFFF;
366
367   if (pool_is_free_index (smm->listen_sessions[type], index))
368     return 0;
369
370   s = pool_elt_at_index (smm->listen_sessions[type], index);
371   ASSERT (s->session_state == SESSION_STATE_LISTENING);
372   return s;
373 }
374
375 always_inline stream_session_t *
376 listen_session_new (session_type_t type)
377 {
378   stream_session_t *s;
379   pool_get_aligned (session_manager_main.listen_sessions[type], s,
380                     CLIB_CACHE_LINE_BYTES);
381   memset (s, 0, sizeof (*s));
382
383   s->session_type = type;
384   s->session_state = SESSION_STATE_LISTENING;
385   s->session_index = s - session_manager_main.listen_sessions[type];
386
387   return s;
388 }
389
390 always_inline stream_session_t *
391 listen_session_get (session_type_t type, u32 index)
392 {
393   return pool_elt_at_index (session_manager_main.listen_sessions[type],
394                             index);
395 }
396
397 always_inline void
398 listen_session_del (stream_session_t * s)
399 {
400   pool_put (session_manager_main.listen_sessions[s->session_type], s);
401 }
402
403 int
404 listen_session_get_local_session_endpoint (stream_session_t * listener,
405                                            session_endpoint_t * sep);
406
407 always_inline stream_session_t *
408 session_manager_get_listener (u8 type, u32 index)
409 {
410   return pool_elt_at_index (session_manager_main.listen_sessions[type],
411                             index);
412 }
413
414 always_inline void
415 session_manager_set_transport_rx_fn (u8 type, u8 is_peek)
416 {
417   /* If an offset function is provided, then peek instead of dequeue */
418   session_manager_main.session_tx_fns[type] = (is_peek) ?
419     session_tx_fifo_peek_and_snd : session_tx_fifo_dequeue_and_snd;
420 }
421
422 session_type_t
423 session_type_from_proto_and_ip (transport_proto_t proto, u8 is_ip4);
424
425 always_inline u8
426 session_manager_is_enabled ()
427 {
428   return session_manager_main.is_enabled == 1;
429 }
430
431 #define session_cli_return_if_not_enabled()                             \
432 do {                                                                    \
433     if (!session_manager_main.is_enabled)                               \
434       return clib_error_return(0, "session layer is not enabled");      \
435 } while (0)
436
437 #endif /* __included_session_h__ */
438
439 /*
440  * fd.io coding-style-patch-verification: ON
441  *
442  * Local Variables:
443  * eval: (c-set-style "gnu")
444  * End:
445  */