FD.io VPP  v21.10.1-2-g0a485f517
Vector Packet Processing
api_shared.c
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1 /*
2  *------------------------------------------------------------------
3  * api_shared.c - API message handling, common code for both clients
4  * and the vlib process itself.
5  *
6  *
7  * Copyright (c) 2009 Cisco and/or its affiliates.
8  * Licensed under the Apache License, Version 2.0 (the "License");
9  * you may not use this file except in compliance with the License.
10  * You may obtain a copy of the License at:
11  *
12  * http://www.apache.org/licenses/LICENSE-2.0
13  *
14  * Unless required by applicable law or agreed to in writing, software
15  * distributed under the License is distributed on an "AS IS" BASIS,
16  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17  * See the License for the specific language governing permissions and
18  * limitations under the License.
19  *------------------------------------------------------------------
20  */
21 
22 #include <stdio.h>
23 #include <stdlib.h>
24 #include <stddef.h>
25 #include <string.h>
26 #include <vppinfra/format.h>
27 #include <vppinfra/byte_order.h>
28 #include <vppinfra/error.h>
29 #include <vlib/vlib.h>
30 #include <vlib/unix/unix.h>
31 #include <vlibapi/api.h>
32 #include <vppinfra/elog.h>
33 #include <vppinfra/callback.h>
34 
35 /* *INDENT-OFF* */
37  {
38  .region_name = "/unset",
39  .api_uid = -1,
40  .api_gid = -1,
41  };
42 /* *INDENT-ON* */
43 
44 /* Please use vlibapi_get_main() to access my_api_main */
46 
47 void
49 {
50  ASSERT (am_arg);
51  my_api_main = (api_main_t *) am_arg;
52 }
53 
54 void
56 {
58  am->missing_clients++;
59 }
60 
61 int
63 {
64  return (am->rx_trace && am->rx_trace->enabled);
65 }
66 
67 int
69 {
70  return (am->tx_trace && am->tx_trace->enabled);
71 }
72 
73 /*
74  * vl_msg_api_trace
75  */
76 void
78 {
79  u8 **this_trace;
80  u8 **old_trace;
81  u8 *msg_copy;
82  u32 length;
83  trace_cfg_t *cfgp;
84  u16 msg_id = clib_net_to_host_u16 (*((u16 *) msg));
85  msgbuf_t *header = (msgbuf_t *) (((u8 *) msg) - offsetof (msgbuf_t, data));
86 
87  cfgp = am->api_trace_cfg + msg_id;
88 
89  if (!cfgp || !cfgp->trace_enable)
90  return;
91 
92  msg_copy = 0;
93 
94  if (tp->nitems == 0)
95  {
96  clib_warning ("tp->nitems is 0");
97  return;
98  }
99 
100  if (vec_len (tp->traces) < tp->nitems)
101  {
102  vec_add1 (tp->traces, 0);
103  this_trace = tp->traces + vec_len (tp->traces) - 1;
104  }
105  else
106  {
107  tp->wrapped = 1;
108  old_trace = tp->traces + tp->curindex++;
109  if (tp->curindex == tp->nitems)
110  tp->curindex = 0;
111  /* Reuse the trace record, may save some memory allocator traffic */
112  msg_copy = *old_trace;
113  vec_reset_length (msg_copy);
114  this_trace = old_trace;
115  }
116 
117  length = clib_net_to_host_u32 (header->data_len);
118 
119  vec_validate (msg_copy, length - 1);
120  clib_memcpy_fast (msg_copy, msg, length);
121  *this_trace = msg_copy;
122 }
123 
124 int
126  int onoff)
127 {
128  vl_api_trace_t *tp;
129  int rv;
130 
131  switch (which)
132  {
133  case VL_API_TRACE_TX:
134  tp = am->tx_trace;
135  if (tp == 0)
136  {
138  tp = am->tx_trace;
139  }
140  break;
141 
142  case VL_API_TRACE_RX:
143  tp = am->rx_trace;
144  if (tp == 0)
145  {
147  tp = am->rx_trace;
148  }
149  break;
150 
151  default:
152  /* duh? */
153  return -1;
154  }
155 
156  /* Configured? */
157  if (tp == 0 || tp->nitems == 0)
158  return -1;
159 
160  rv = tp->enabled;
161  tp->enabled = onoff;
162 
163  return rv;
164 }
165 
166 int
168 {
169  vl_api_trace_t *tp;
170  int i;
171 
172  switch (which)
173  {
174  case VL_API_TRACE_TX:
175  tp = am->tx_trace;
176  break;
177 
178  case VL_API_TRACE_RX:
179  tp = am->rx_trace;
180  break;
181 
182  default:
183  /* duh? */
184  return -1;
185  }
186 
187  /* Configured? */
188  if (!tp || tp->nitems == 0)
189  return -1;
190 
191  tp->curindex = 0;
192  tp->wrapped = 0;
193 
194  for (i = 0; i < vec_len (tp->traces); i++)
195  {
196  vec_free (tp->traces[i]);
197  }
198  vec_free (tp->traces);
199 
200  return 0;
201 }
202 
203 u8 *
205 {
206  serialize_main_t _sm, *sm = &_sm;
207  hash_pair_t *hp;
208  u32 nmsg = hash_elts (am->msg_index_by_name_and_crc);
209 
210  serialize_open_vector (sm, vector);
211 
212  /* serialize the count */
213  serialize_integer (sm, nmsg, sizeof (u32));
214 
215  /* *INDENT-OFF* */
216  hash_foreach_pair (hp, am->msg_index_by_name_and_crc,
217  ({
218  serialize_likely_small_unsigned_integer (sm, hp->value[0]);
219  serialize_cstring (sm, (char *) hp->key);
220  }));
221  /* *INDENT-ON* */
222 
223  return serialize_close_vector (sm);
224 }
225 
226 int
228 {
229  vl_api_trace_t *tp;
230  vl_api_trace_file_header_t fh;
231  int i;
232  u8 *msg;
233 
234  switch (which)
235  {
236  case VL_API_TRACE_TX:
237  tp = am->tx_trace;
238  break;
239 
240  case VL_API_TRACE_RX:
241  tp = am->rx_trace;
242  break;
243 
244  default:
245  /* duh? */
246  return -1;
247  }
248 
249  /* Configured, data present? */
250  if (tp == 0 || tp->nitems == 0 || vec_len (tp->traces) == 0)
251  return -1;
252 
253  /* "Dare to be stupid" check */
254  if (fp == 0)
255  {
256  return -2;
257  }
258 
259  /* Write the file header */
260  fh.wrapped = tp->wrapped;
261  fh.nitems = clib_host_to_net_u32 (vec_len (tp->traces));
263  fh.msgtbl_size = clib_host_to_net_u32 (vec_len (m));
264 
265  if (fwrite (&fh, sizeof (fh), 1, fp) != 1)
266  {
267  return (-10);
268  }
269 
270  /* Write the message table */
271  if (fwrite (m, vec_len (m), 1, fp) != 1)
272  {
273  return (-14);
274  }
275  vec_free (m);
276 
277  /* No-wrap case */
278  if (tp->wrapped == 0)
279  {
280  /*
281  * Note: vec_len return 0 when fed a NULL pointer.
282  * Unfortunately, the static analysis tool doesn't
283  * figure it out, hence the suppressed warnings.
284  * What a great use of my time.
285  */
286  for (i = 0; i < vec_len (tp->traces); i++)
287  {
288  u32 msg_length;
289  /*sa_ignore NO_NULL_CHK */
290  msg = tp->traces[i];
291  /*
292  * This retarded check required to pass
293  * [sic] SA-checking.
294  */
295  if (!msg)
296  continue;
297 
298  msg_length = clib_host_to_net_u32 (vec_len (msg));
299  if (fwrite (&msg_length, 1, sizeof (msg_length), fp)
300  != sizeof (msg_length))
301  {
302  return (-14);
303  }
304  if (fwrite (msg, 1, vec_len (msg), fp) != vec_len (msg))
305  {
306  return (-11);
307  }
308  }
309  }
310  else
311  {
312  /* Wrap case: write oldest -> end of buffer */
313  for (i = tp->curindex; i < vec_len (tp->traces); i++)
314  {
315  u32 msg_length;
316  msg = tp->traces[i];
317  /*
318  * This retarded check required to pass
319  * [sic] SA-checking
320  */
321  if (!msg)
322  continue;
323 
324  msg_length = clib_host_to_net_u32 (vec_len (msg));
325  if (fwrite (&msg_length, 1, sizeof (msg_length), fp)
326  != sizeof (msg_length))
327  {
328  return (-14);
329  }
330 
331  if (fwrite (msg, 1, vec_len (msg), fp) != vec_len (msg))
332  {
333  return (-12);
334  }
335  }
336  /* write beginning of buffer -> oldest-1 */
337  for (i = 0; i < tp->curindex; i++)
338  {
339  u32 msg_length;
340  /*sa_ignore NO_NULL_CHK */
341  msg = tp->traces[i];
342  /*
343  * This retarded check required to pass
344  * [sic] SA-checking
345  */
346  if (!msg)
347  continue;
348 
349  msg_length = clib_host_to_net_u32 (vec_len (msg));
350  if (fwrite (&msg_length, 1, sizeof (msg_length), fp)
351  != sizeof (msg_length))
352  {
353  return (-14);
354  }
355 
356  if (fwrite (msg, 1, vec_len (msg), fp) != vec_len (msg))
357  {
358  return (-13);
359  }
360  }
361  }
362  return 0;
363 }
364 
365 int
367  u32 nitems)
368 {
369  vl_api_trace_t *tp;
370  int was_on = 0;
371 
372  switch (which)
373  {
374  case VL_API_TRACE_TX:
375  tp = am->tx_trace;
376  if (tp == 0)
377  {
378  vec_validate (am->tx_trace, 0);
379  tp = am->tx_trace;
380  }
381  break;
382 
383  case VL_API_TRACE_RX:
384  tp = am->rx_trace;
385  if (tp == 0)
386  {
387  vec_validate (am->rx_trace, 0);
388  tp = am->rx_trace;
389  }
390 
391  break;
392 
393  default:
394  return -1;
395 
396  }
397 
398  if (tp->enabled)
399  {
400  was_on = vl_msg_api_trace_onoff (am, which, 0);
401  }
402  if (tp->traces)
403  {
405  }
406 
407  clib_memset (tp, 0, sizeof (*tp));
408 
410  {
412  }
413  else
414  {
416  }
417 
418  tp->nitems = nitems;
419  if (was_on)
420  {
421  (void) vl_msg_api_trace_onoff (am, which, was_on);
422  }
423  return 0;
424 }
425 
426 void
428 {
429 }
430 
431 void
433 {
434 }
435 
436 always_inline void
438  void *the_msg, int trace_it, int do_it, int free_it)
439 {
440  u16 id = clib_net_to_host_u16 (*((u16 *) the_msg));
441  u8 *(*print_fp) (void *, void *);
442 
443  if (PREDICT_FALSE (am->elog_trace_api_messages))
444  {
445  /* *INDENT-OFF* */
446  ELOG_TYPE_DECLARE (e) =
447  {
448  .format = "api-msg: %s",
449  .format_args = "T4",
450  };
451  /* *INDENT-ON* */
452  struct
453  {
454  u32 c;
455  } *ed;
456  ed = ELOG_DATA (am->elog_main, e);
457  if (id < vec_len (am->msg_names) && am->msg_names[id])
458  ed->c = elog_string (am->elog_main, (char *) am->msg_names[id]);
459  else
460  ed->c = elog_string (am->elog_main, "BOGUS");
461  }
462 
463  if (id < vec_len (am->msg_handlers) && am->msg_handlers[id])
464  {
465  if (trace_it)
466  vl_msg_api_trace (am, am->rx_trace, the_msg);
467 
468  if (am->msg_print_flag)
469  {
470  fformat (stdout, "[%d]: %s\n", id, am->msg_names[id]);
471  print_fp = (void *) am->msg_print_handlers[id];
472  if (print_fp == 0)
473  {
474  fformat (stdout, " [no registered print fn]\n");
475  }
476  else
477  {
478  (*print_fp) (the_msg, stdout);
479  }
480  }
481 
482  if (do_it)
483  {
484  if (!am->is_mp_safe[id])
485  {
486  vl_msg_api_barrier_trace_context (am->msg_names[id]);
488  }
489 
490  if (am->is_autoendian[id])
491  {
492  void (*endian_fp) (void *);
493  endian_fp = am->msg_endian_handlers[id];
494  (*endian_fp) (the_msg);
495  }
496 
497  if (PREDICT_FALSE (vec_len (am->perf_counter_cbs) != 0))
498  clib_call_callbacks (am->perf_counter_cbs, am, id,
499  0 /* before */ );
500 
501  (*am->msg_handlers[id]) (the_msg);
502 
503  if (PREDICT_FALSE (vec_len (am->perf_counter_cbs) != 0))
504  clib_call_callbacks (am->perf_counter_cbs, am, id,
505  1 /* after */ );
506  if (!am->is_mp_safe[id])
508  }
509  }
510  else
511  {
512  clib_warning ("no handler for msg id %d", id);
513  }
514 
515  if (free_it)
516  vl_msg_api_free (the_msg);
517 
518  if (PREDICT_FALSE (am->elog_trace_api_messages))
519  {
520  /* *INDENT-OFF* */
521  ELOG_TYPE_DECLARE (e) =
522  {
523  .format = "api-msg-done(%s): %s",
524  .format_args = "t4T4",
525  .n_enum_strings = 2,
526  .enum_strings =
527  {
528  "barrier",
529  "mp-safe",
530  }
531  };
532  /* *INDENT-ON* */
533 
534  struct
535  {
536  u32 barrier;
537  u32 c;
538  } *ed;
539  ed = ELOG_DATA (am->elog_main, e);
540  if (id < vec_len (am->msg_names) && am->msg_names[id])
541  {
542  ed->c = elog_string (am->elog_main, (char *) am->msg_names[id]);
543  ed->barrier = !am->is_mp_safe[id];
544  }
545  else
546  {
547  ed->c = elog_string (am->elog_main, "BOGUS");
548  ed->barrier = 0;
549  }
550  }
551 }
552 
553 void (*vl_msg_api_fuzz_hook) (u16, void *);
554 
555 /* This is only to be called from a vlib/vnet app */
556 void
558  void *the_msg, vlib_main_t * vm,
559  vlib_node_runtime_t * node, u8 is_private)
560 {
561  u16 id = clib_net_to_host_u16 (*((u16 *) the_msg));
562  u8 *(*handler) (void *, void *, void *);
563  u8 *(*print_fp) (void *, void *);
564  svm_region_t *old_vlib_rp;
565  void *save_shmem_hdr;
566  int is_mp_safe = 1;
567 
568  if (PREDICT_FALSE (am->elog_trace_api_messages))
569  {
570  /* *INDENT-OFF* */
571  ELOG_TYPE_DECLARE (e) =
572  {
573  .format = "api-msg: %s",
574  .format_args = "T4",
575  };
576  /* *INDENT-ON* */
577  struct
578  {
579  u32 c;
580  } *ed;
581  ed = ELOG_DATA (am->elog_main, e);
582  if (id < vec_len (am->msg_names) && am->msg_names[id])
583  ed->c = elog_string (am->elog_main, (char *) am->msg_names[id]);
584  else
585  ed->c = elog_string (am->elog_main, "BOGUS");
586  }
587 
588  if (id < vec_len (am->msg_handlers) && am->msg_handlers[id])
589  {
590  handler = (void *) am->msg_handlers[id];
591 
592  if (PREDICT_FALSE (am->rx_trace && am->rx_trace->enabled))
593  vl_msg_api_trace (am, am->rx_trace, the_msg);
594 
595  if (PREDICT_FALSE (am->msg_print_flag))
596  {
597  fformat (stdout, "[%d]: %s\n", id, am->msg_names[id]);
598  print_fp = (void *) am->msg_print_handlers[id];
599  if (print_fp == 0)
600  {
601  fformat (stdout, " [no registered print fn for msg %d]\n", id);
602  }
603  else
604  {
605  (*print_fp) (the_msg, vm);
606  }
607  }
608  is_mp_safe = am->is_mp_safe[id];
609 
610  if (!is_mp_safe)
611  {
612  vl_msg_api_barrier_trace_context (am->msg_names[id]);
614  }
615  if (is_private)
616  {
617  old_vlib_rp = am->vlib_rp;
618  save_shmem_hdr = am->shmem_hdr;
619  am->vlib_rp = vlib_rp;
620  am->shmem_hdr = (void *) vlib_rp->user_ctx;
621  }
622 
624  (*vl_msg_api_fuzz_hook) (id, the_msg);
625 
626  if (am->is_autoendian[id])
627  {
628  void (*endian_fp) (void *);
629  endian_fp = am->msg_endian_handlers[id];
630  (*endian_fp) (the_msg);
631  }
632  if (PREDICT_FALSE (vec_len (am->perf_counter_cbs) != 0))
633  clib_call_callbacks (am->perf_counter_cbs, am, id, 0 /* before */ );
634 
635  (*handler) (the_msg, vm, node);
636 
637  if (PREDICT_FALSE (vec_len (am->perf_counter_cbs) != 0))
638  clib_call_callbacks (am->perf_counter_cbs, am, id, 1 /* after */ );
639  if (is_private)
640  {
641  am->vlib_rp = old_vlib_rp;
642  am->shmem_hdr = save_shmem_hdr;
643  }
644  if (!is_mp_safe)
646  }
647  else
648  {
649  clib_warning ("no handler for msg id %d", id);
650  }
651 
652  /*
653  * Special-case, so we can e.g. bounce messages off the vnet
654  * main thread without copying them...
655  */
656  if (id >= vec_len (am->message_bounce) || !(am->message_bounce[id]))
657  {
658  if (is_private)
659  {
660  old_vlib_rp = am->vlib_rp;
661  save_shmem_hdr = am->shmem_hdr;
662  am->vlib_rp = vlib_rp;
663  am->shmem_hdr = (void *) vlib_rp->user_ctx;
664  }
665  vl_msg_api_free (the_msg);
666  if (is_private)
667  {
668  am->vlib_rp = old_vlib_rp;
669  am->shmem_hdr = save_shmem_hdr;
670  }
671  }
672 
673  if (PREDICT_FALSE (am->elog_trace_api_messages))
674  {
675  /* *INDENT-OFF* */
676  ELOG_TYPE_DECLARE (e) =
677  {
678  .format = "api-msg-done(%s): %s",
679  .format_args = "t4T4",
680  .n_enum_strings = 2,
681  .enum_strings =
682  {
683  "barrier",
684  "mp-safe",
685  }
686  };
687  /* *INDENT-ON* */
688 
689  struct
690  {
691  u32 barrier;
692  u32 c;
693  } *ed;
694  ed = ELOG_DATA (am->elog_main, e);
695  if (id < vec_len (am->msg_names) && am->msg_names[id])
696  ed->c = elog_string (am->elog_main, (char *) am->msg_names[id]);
697  else
698  ed->c = elog_string (am->elog_main, "BOGUS");
699  ed->barrier = is_mp_safe;
700  }
701 }
702 
703 void
704 vl_msg_api_handler (void *the_msg)
705 {
707 
708  msg_handler_internal (am, the_msg,
709  (am->rx_trace
710  && am->rx_trace->enabled) /* trace_it */ ,
711  1 /* do_it */ , 1 /* free_it */ );
712 }
713 
714 void
716 {
718  msg_handler_internal (am, the_msg,
719  (am->rx_trace
720  && am->rx_trace->enabled) /* trace_it */ ,
721  1 /* do_it */ , 0 /* free_it */ );
722 }
723 
724 void
726 {
728  msg_handler_internal (am, the_msg, 0 /* trace_it */ , 1 /* do_it */ ,
729  0 /* free_it */ );
730 }
731 
732 /*
733  * Add a trace record to the API message trace buffer, if
734  * API message tracing is enabled. Handy for adding sufficient
735  * data to the trace to reproduce autonomous state, as opposed to
736  * state downloaded via control-plane API messages. Example: the NAT
737  * application creates database entries based on packet traffic, not
738  * control-plane messages.
739  *
740  */
741 void
742 vl_msg_api_trace_only (void *the_msg)
743 {
745 
746  msg_handler_internal (am, the_msg,
747  (am->rx_trace
748  && am->rx_trace->enabled) /* trace_it */ ,
749  0 /* do_it */ , 0 /* free_it */ );
750 }
751 
752 void
754 {
756  u16 id = clib_net_to_host_u16 (*((u16 *) the_msg));
757 
758  if (PREDICT_FALSE (id >= vec_len (am->msg_cleanup_handlers)))
759  {
760  clib_warning ("_vl_msg_id too large: %d\n", id);
761  return;
762  }
763  if (am->msg_cleanup_handlers[id])
764  (*am->msg_cleanup_handlers[id]) (the_msg);
765 
766  vl_msg_api_free (the_msg);
767 }
768 
769 /*
770  * vl_msg_api_replay_handler
771  */
772 void
774 {
776 
777  u16 id = clib_net_to_host_u16 (*((u16 *) the_msg));
778 
779  if (PREDICT_FALSE (id >= vec_len (am->msg_handlers)))
780  {
781  clib_warning ("_vl_msg_id too large: %d\n", id);
782  return;
783  }
784  /* do NOT trace the message... */
785  if (am->msg_handlers[id])
786  (*am->msg_handlers[id]) (the_msg);
787  /* do NOT free the message buffer... */
788 }
789 
790 u32
792 {
793  return vl_msg_api_get_msg_length_inline (msg_arg);
794 }
795 
796 /*
797  * vl_msg_api_socket_handler
798  */
799 void
801 {
803 
804  msg_handler_internal (am, the_msg,
805  (am->rx_trace
806  && am->rx_trace->enabled) /* trace_it */ ,
807  1 /* do_it */ , 0 /* free_it */ );
808 }
809 
810 #define foreach_msg_api_vector \
811 _(msg_names) \
812 _(msg_handlers) \
813 _(msg_cleanup_handlers) \
814 _(msg_endian_handlers) \
815 _(msg_print_handlers) \
816 _(api_trace_cfg) \
817 _(message_bounce) \
818 _(is_mp_safe) \
819 _(is_autoendian)
820 
821 void
823 {
825 
826  /*
827  * This happens during the java core tests if the message
828  * dictionary is missing newly added xxx_reply_t messages.
829  * Should never happen, but since I shot myself in the foot once
830  * this way, I thought I'd make it easy to debug if I ever do
831  * it again... (;-)...
832  */
833  if (c->id == 0)
834  {
835  if (c->name)
836  clib_warning ("Trying to register %s with a NULL msg id!", c->name);
837  else
838  clib_warning ("Trying to register a NULL msg with a NULL msg id!");
839  clib_warning ("Did you forget to call setup_message_id_table?");
840  return;
841  }
842 
843 #define _(a) vec_validate (am->a, c->id);
845 #undef _
846 
847  if (am->msg_handlers[c->id] && am->msg_handlers[c->id] != c->handler)
849  ("BUG: re-registering 'vl_api_%s_t_handler'."
850  "Handler was %llx, replaced by %llx",
851  c->name, am->msg_handlers[c->id], c->handler);
852 
853  am->msg_names[c->id] = c->name;
854  am->msg_handlers[c->id] = c->handler;
855  am->msg_cleanup_handlers[c->id] = c->cleanup;
856  am->msg_endian_handlers[c->id] = c->endian;
857  am->msg_print_handlers[c->id] = c->print;
858  am->message_bounce[c->id] = c->message_bounce;
859  am->is_mp_safe[c->id] = c->is_mp_safe;
860  am->is_autoendian[c->id] = c->is_autoendian;
861 
862  am->api_trace_cfg[c->id].size = c->size;
863  am->api_trace_cfg[c->id].trace_enable = c->traced;
864  am->api_trace_cfg[c->id].replay_enable = c->replay;
865 }
866 
867 /*
868  * vl_msg_api_set_handlers
869  * preserve the old API for a while
870  */
871 void
872 vl_msg_api_set_handlers (int id, char *name, void *handler, void *cleanup,
873  void *endian, void *print, int size, int traced)
874 {
876  vl_msg_api_msg_config_t *c = &cfg;
877 
878  clib_memset (c, 0, sizeof (*c));
879 
880  c->id = id;
881  c->name = name;
882  c->handler = handler;
883  c->cleanup = cleanup;
884  c->endian = endian;
885  c->print = print;
886  c->traced = traced;
887  c->replay = 1;
888  c->message_bounce = 0;
889  c->is_mp_safe = 0;
890  c->is_autoendian = 0;
892 }
893 
894 void
896 {
898  vl_msg_api_msg_config_t *c = &cfg;
899 
900  clib_memset (c, 0, sizeof (*c));
901 
902  c->id = msg_id;
904 }
905 
906 void
907 vl_msg_api_set_cleanup_handler (int msg_id, void *fp)
908 {
910  ASSERT (msg_id > 0);
911 
912  vec_validate (am->msg_cleanup_handlers, msg_id);
913  am->msg_cleanup_handlers[msg_id] = fp;
914 }
915 
916 void
918 {
919  uword msg;
920 
921  while (!svm_queue_sub (q, (u8 *) & msg, SVM_Q_WAIT, 0))
922  vl_msg_api_handler ((void *) msg);
923 }
924 
925 u32
927 {
928  msgbuf_t *mb;
929  u32 data_len = ~0;
930 
931  /* Work out the maximum sane message length, and return it */
932  if (PREDICT_TRUE (mp != 0))
933  {
934  mb = (msgbuf_t *) (((u8 *) mp) - offsetof (msgbuf_t, data));
935  data_len = clib_net_to_host_u32 (mb->data_len);
936  }
937  return data_len;
938 }
939 
942 {
943  switch (which)
944  {
945  case VL_API_TRACE_RX:
946  return am->rx_trace;
947  case VL_API_TRACE_TX:
948  return am->tx_trace;
949  default:
950  return 0;
951  }
952 }
953 
954 void
955 vl_noop_handler (void *mp)
956 {
957 }
958 
959 
961 
962 void
964 {
965  post_mortem_dump_enabled = enable;
966 }
967 
968 void
970 {
972  FILE *fp;
973  char filename[64];
974  int rv;
975 
976  if (post_mortem_dump_enabled == 0)
977  return;
978 
979  snprintf (filename, sizeof (filename), "/tmp/api_post_mortem.%d",
980  getpid ());
981 
982  fp = fopen (filename, "w");
983  if (fp == NULL)
984  {
985  rv = write (2, "Couldn't create ", 16);
986  rv = write (2, filename, strlen (filename));
987  rv = write (2, "\n", 1);
988  return;
989  }
991  fclose (fp);
992  if (rv < 0)
993  {
994  rv = write (2, "Failed to save post-mortem API trace to ", 40);
995  rv = write (2, filename, strlen (filename));
996  rv = write (2, "\n", 1);
997  }
998 
999 }
1000 
1001 /* Layered message handling support */
1002 
1003 void
1004 vl_msg_api_register_pd_handler (void *fp, u16 msg_id_host_byte_order)
1005 {
1007 
1008  /* Mild idiot proofing */
1009  if (msg_id_host_byte_order > 10000)
1010  clib_warning ("msg_id_host_byte_order endian issue? %d arg vs %d",
1011  msg_id_host_byte_order,
1012  clib_net_to_host_u16 (msg_id_host_byte_order));
1013  vec_validate (am->pd_msg_handlers, msg_id_host_byte_order);
1014  am->pd_msg_handlers[msg_id_host_byte_order] = fp;
1015 }
1016 
1017 int
1018 vl_msg_api_pd_handler (void *mp, int rv)
1019 {
1021  int (*fp) (void *, int);
1022  u16 msg_id;
1023 
1025  msg_id = clib_net_to_host_u16 (*((u16 *) mp));
1026  else
1027  msg_id = *((u16 *) mp);
1028 
1029  if (msg_id >= vec_len (am->pd_msg_handlers)
1030  || am->pd_msg_handlers[msg_id] == 0)
1031  return rv;
1032 
1033  fp = am->pd_msg_handlers[msg_id];
1034  rv = (*fp) (mp, rv);
1035  return rv;
1036 }
1037 
1038 void
1040 {
1042 
1043  am->first_available_msg_id = first_avail;
1044 }
1045 
1046 u16
1047 vl_msg_api_get_msg_ids (const char *name, int n)
1048 {
1050  u8 *name_copy;
1051  vl_api_msg_range_t *rp;
1052  uword *p;
1053  u16 rv;
1054 
1055  if (am->msg_range_by_name == 0)
1056  am->msg_range_by_name = hash_create_string (0, sizeof (uword));
1057 
1058  name_copy = format (0, "%s%c", name, 0);
1059 
1060  p = hash_get_mem (am->msg_range_by_name, name_copy);
1061  if (p)
1062  {
1063  clib_warning ("WARNING: duplicate message range registration for '%s'",
1064  name_copy);
1065  vec_free (name_copy);
1066  return ((u16) ~ 0);
1067  }
1068 
1069  if (n < 0 || n > 1024)
1070  {
1071  clib_warning
1072  ("WARNING: bad number of message-IDs (%d) requested by '%s'",
1073  n, name_copy);
1074  vec_free (name_copy);
1075  return ((u16) ~ 0);
1076  }
1077 
1078  vec_add2 (am->msg_ranges, rp, 1);
1079 
1080  rv = rp->first_msg_id = am->first_available_msg_id;
1081  am->first_available_msg_id += n;
1082  rp->last_msg_id = am->first_available_msg_id - 1;
1083  rp->name = name_copy;
1084 
1085  hash_set_mem (am->msg_range_by_name, name_copy, rp - am->msg_ranges);
1086 
1087  return rv;
1088 }
1089 
1090 void
1091 vl_msg_api_add_msg_name_crc (api_main_t * am, const char *string, u32 id)
1092 {
1093  uword *p;
1094 
1095  if (am->msg_index_by_name_and_crc == 0)
1096  am->msg_index_by_name_and_crc = hash_create_string (0, sizeof (uword));
1097 
1098  p = hash_get_mem (am->msg_index_by_name_and_crc, string);
1099  if (p)
1100  {
1101  clib_warning ("attempt to redefine '%s' ignored...", string);
1102  return;
1103  }
1104 
1105  hash_set_mem (am->msg_index_by_name_and_crc, string, id);
1106 }
1107 
1108 void
1109 vl_msg_api_add_version (api_main_t * am, const char *string,
1110  u32 major, u32 minor, u32 patch)
1111 {
1112  api_version_t version = {.major = major,.minor = minor,.patch = patch };
1113  ASSERT (strlen (string) < 64);
1114  strncpy (version.name, string, 64 - 1);
1115  vec_add1 (am->api_version_list, version);
1116 }
1117 
1118 u32
1120 {
1122  uword *p;
1123 
1124  if (am->msg_index_by_name_and_crc)
1125  {
1126  p = hash_get_mem (am->msg_index_by_name_and_crc, name_and_crc);
1127  if (p)
1128  return p[0];
1129  }
1130  return ~0;
1131 }
1132 
1133 void *
1135 {
1136  pthread_mutex_lock (&vlib_rp->mutex);
1137  return svm_push_data_heap (vlib_rp);
1138 }
1139 
1140 void *
1142 {
1144  return vl_msg_push_heap_w_region (am->vlib_rp);
1145 }
1146 
1147 void
1149 {
1150  svm_pop_heap (oldheap);
1151  pthread_mutex_unlock (&vlib_rp->mutex);
1152 }
1153 
1154 void
1155 vl_msg_pop_heap (void *oldheap)
1156 {
1158  vl_msg_pop_heap_w_region (am->vlib_rp, oldheap);
1159 }
1160 
1161 /* Must be nul terminated */
1162 int
1164 {
1165  /* copy without nul terminator */
1166  u32 len = strlen (buf);
1167  if (len > 0)
1168  clib_memcpy_fast (str->buf, buf, len);
1169  str->length = htonl (len);
1170  return len + sizeof (u32);
1171 }
1172 
1173 /* Must NOT be nul terminated */
1174 int
1176 {
1177  u32 len = vec_len (vec);
1178  clib_memcpy (str->buf, vec, len);
1179  str->length = htonl (len);
1180  return len + sizeof (u32);
1181 }
1182 
1183 u32
1185 {
1186  return clib_net_to_host_u32 (astr->length);
1187 }
1188 
1189 u8 *
1190 vl_api_format_string (u8 * s, va_list * args)
1191 {
1192  vl_api_string_t *a = va_arg (*args, vl_api_string_t *);
1193  vec_add (s, a->buf, clib_net_to_host_u32 (a->length));
1194  return s;
1195 }
1196 
1197 /*
1198  * Returns a new vector. Remember to free it after use.
1199  * NOT nul terminated.
1200  */
1201 u8 *
1203 {
1204  u8 *v = 0;
1205 
1206  if (vl_msg_api_max_length (mp) < clib_net_to_host_u32 (astr->length))
1207  return format (0, "insane astr->length %u%c",
1208  clib_net_to_host_u32 (astr->length), 0);
1209  vec_add (v, astr->buf, clib_net_to_host_u32 (astr->length));
1210  return v;
1211 }
1212 
1213 /*
1214  * Returns a new vector. Remember to free it after use.
1215  * Nul terminated.
1216  */
1217 char *
1219 {
1220  char *v = 0;
1221  if (clib_net_to_host_u32 (astr->length) > 0)
1222  {
1223  vec_add (v, astr->buf, clib_net_to_host_u32 (astr->length));
1224  vec_add1 (v, 0);
1225  }
1226  return v;
1227 }
1228 
1229 void
1231 {
1233  am->elog_main = m;
1234 }
1235 
1236 int
1238 {
1239  int rv;
1241 
1242  rv = am->elog_trace_api_messages;
1243  am->elog_trace_api_messages = enable;
1244  return rv;
1245 }
1246 
1247 int
1249 {
1251 
1252  return am->elog_trace_api_messages;
1253 }
1254 
1255 /*
1256  * fd.io coding-style-patch-verification: ON
1257  *
1258  * Local Variables:
1259  * eval: (c-set-style "gnu")
1260  * End:
1261  */
vec_reset_length
#define vec_reset_length(v)
Reset vector length to zero NULL-pointer tolerant.
Definition: vec_bootstrap.h:194
vlib.h
vl_msg_push_heap_w_region
void * vl_msg_push_heap_w_region(svm_region_t *vlib_rp)
Definition: api_shared.c:1134
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void vl_msg_api_replay_handler(void *the_msg)
Definition: api_shared.c:773
serialize_integer
static void serialize_integer(serialize_main_t *m, u64 x, u32 n_bytes)
Definition: serialize.h:185
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#define vec_add(V, E, N)
Add N elements to end of vector V (no header, unspecified alignment)
Definition: vec.h:688
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static u32 vl_msg_api_get_msg_length_inline(void *msg_arg)
Definition: api.h:91
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#define clib_memcpy(d, s, n)
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#define VL_API_LITTLE_ENDIAN
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VL_API_BIG_ENDIAN
#define VL_API_BIG_ENDIAN
Definition: api_common.h:111
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#define hash_foreach_pair(p, v, body)
Iterate over hash pairs.
Definition: hash.h:373
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string name[64]
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#define clib_arch_is_big_endian
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Definition: api_common.h:107
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Message configuration definition.
Definition: api_common.h:122
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Definition: hash.h:118
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unsigned short u16
Definition: types.h:57
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Definition: api_shared.c:872
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Trace ring.
Definition: api_common.h:100
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Definition: nat44_ei.c:3047
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message length not including header
Definition: api_common.h:143
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Definition: api_common.h:104
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add a string to the event-log string table
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Definition: api_shared.c:48
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Definition: serialize.c:909
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Definition: api_shared.c:800
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Callback multiplex scheme For a fully worked-out example, see .../src/vlib/main.[ch] and ....
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vl_api_trace_t * vl_msg_api_trace_get(api_main_t *am, vl_api_trace_which_t which)
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Definition: svm_common.h:38
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u8 enabled
trace is enabled
Definition: api_common.h:95
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static void msg_handler_internal(api_main_t *am, void *the_msg, int trace_it, int do_it, int free_it)
Definition: api_shared.c:437
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int which
Definition: cJSON.h:234
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#define vec_len(v)
Number of elements in vector (rvalue-only, NULL tolerant)
Definition: vec_bootstrap.h:142
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Trace configuration for a single message.
Definition: api_common.h:82
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#define ELOG_TYPE_DECLARE(f)
Definition: elog.h:442
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u8 len
Definition: ip_types.api:103
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#define vec_add2(V, P, N)
Add N elements to end of vector V, return pointer to new elements in P.
Definition: vec.h:644
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#define vec_add1(V, E)
Add 1 element to end of vector (unspecified alignment).
Definition: vec.h:606
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void vl_msg_api_add_version(api_main_t *am, const char *string, u32 major, u32 minor, u32 patch)
Definition: api_shared.c:1109
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static u8 post_mortem_dump_enabled
Definition: api_shared.c:960
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const char * region_name
Shared VM binary API region name.
Definition: api_common.h:357
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u8 endian
trace endianness
Definition: api_common.h:94
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void vl_msg_api_barrier_sync(void)
Definition: api_shared.c:427
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Definition: memclnt.api:120
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#define PREDICT_FALSE(x)
Definition: clib.h:124
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Definition: api_shared.c:125
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void vl_msg_pop_heap_w_region(svm_region_t *vlib_rp, void *oldheap)
Definition: api_shared.c:1148
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Definition: cJSON.c:1183
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u64 uword
Definition: types.h:112
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void vl_msg_api_clean_handlers(int msg_id)
Definition: api_shared.c:895
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if(node->flags &VLIB_NODE_FLAG_TRACE) vnet_interface_output_trace(vm
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static void svm_pop_heap(void *oldheap)
Definition: svm.h:94
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static api_main_t * vlibapi_get_main(void)
Definition: api_common.h:390
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Definition: api_shared.c:742
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u8 * vl_api_serialize_message_table(api_main_t *am, u8 *vector)
Definition: api_shared.c:204
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Definition: api_shared.c:704
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Definition: api_shared.c:553
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Definition: input.c:757
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#define vec_validate(V, I)
Make sure vector is long enough for given index (no header, unspecified alignment)
Definition: vec.h:523
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u32 curindex
Current index in circular buffer
Definition: api_common.h:99
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vl_msg_api_trace
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Definition: api_shared.c:77
vl_msg_api_post_mortem_dump
void vl_msg_api_post_mortem_dump(void)
Definition: api_shared.c:969
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void * vl_msg_push_heap(void)
Definition: api_shared.c:1141
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#define foreach_msg_api_vector
Definition: api_shared.c:810
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void vl_msg_api_queue_handler(svm_queue_t *q)
Definition: api_shared.c:917
vl_api_string_len
u32 vl_api_string_len(vl_api_string_t *astr)
Definition: api_shared.c:1184
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u8 * vl_api_format_string(u8 *s, va_list *args)
Definition: api_shared.c:1190
vl_api_trace_t
API trace state.
Definition: api_common.h:92
vl_msg_api_handler_no_trace_no_free
void vl_msg_api_handler_no_trace_no_free(void *the_msg)
Definition: api_shared.c:725
vl_msg_api_add_msg_name_crc
void vl_msg_api_add_msg_name_crc(api_main_t *am, const char *string, u32 id)
Definition: api_shared.c:1091
vl_msg_api_barrier_release
void vl_msg_api_barrier_release(void)
Definition: api_shared.c:432
vl_msg_api_set_first_available_msg_id
void vl_msg_api_set_first_available_msg_id(u16 first_avail)
Definition: api_shared.c:1039
vl_msg_api_handler_no_free
void vl_msg_api_handler_no_free(void *the_msg)
Definition: api_shared.c:715
api_main_t
API main structure, used by both vpp and binary API clients.
Definition: api_common.h:228
data
u8 data[128]
Definition: ipsec_types.api:95
vl_msg_api_trace_free
int vl_msg_api_trace_free(api_main_t *am, vl_api_trace_which_t which)
Definition: api_shared.c:167
vl_api_set_elog_trace_api_messages
int vl_api_set_elog_trace_api_messages(int enable)
Definition: api_shared.c:1237
id
u8 id[64]
Definition: dhcp.api:160
hash_get_mem
#define hash_get_mem(h, key)
Definition: hash.h:269
vl_api_c_string_to_api_string
int vl_api_c_string_to_api_string(const char *buf, vl_api_string_t *str)
Definition: api_shared.c:1163
vec_free
#define vec_free(V)
Free vector's memory (no header).
Definition: vec.h:395
api_version_t
Definition: api_common.h:219
api_main_t::vlib_rp
svm_region_t * vlib_rp
Current binary api segment descriptor.
Definition: api_common.h:284
size
u32 size
Definition: vhost_user.h:125
vl_api_string_t::buf
u8 buf[0]
Definition: api_types.h:38
always_inline
#define always_inline
Definition: rdma_mlx5dv.h:23
vl_api_trace_t::nitems
u32 nitems
Number of trace records.
Definition: api_common.h:98
minor
u32 minor
Definition: memclnt.api:119
vl_noop_handler
void vl_noop_handler(void *mp)
Definition: api_shared.c:955
vl_msg_api_free
void vl_msg_api_free(void *)
Definition: memory_shared.c:311
vl_api_vec_to_api_string
int vl_api_vec_to_api_string(const u8 *vec, vl_api_string_t *str)
Definition: api_shared.c:1175
vl_api_trace_t::wrapped
u8 wrapped
trace has wrapped
Definition: api_common.h:96
clib_call_callbacks
#define clib_call_callbacks(h,...)
call the specified callback set
Definition: callback.h:67
format
description fragment has unexpected format
Definition: map.api:433
ASSERT
#define ASSERT(truth)
Definition: error_bootstrap.h:69
vl_msg_pop_heap
void vl_msg_pop_heap(void *oldheap)
Definition: api_shared.c:1155
serialize_close_vector
__clib_export void * serialize_close_vector(serialize_main_t *m)
Definition: serialize.c:919
vl_msg_api_barrier_trace_context
#define vl_msg_api_barrier_trace_context(X)
Definition: api_common.h:192
version
option version
Definition: sample.api:19
data_len
u8 data_len
Definition: ikev2_types.api:24
api_global_main
api_main_t api_global_main
Definition: api_shared.c:36
vl_msg_api_tx_trace_enabled
int vl_msg_api_tx_trace_enabled(api_main_t *am)
Definition: api_shared.c:68
vl_api_msg_range_t
Message range (belonging to a plugin)
Definition: api_common.h:114
buf
u64 buf
Definition: application.c:493
u32
unsigned int u32
Definition: types.h:88
svm_region_::user_ctx
volatile void * user_ctx
Definition: svm_common.h:48
trace_cfg_t::trace_enable
int trace_enable
trace this message
Definition: api_common.h:85
vl_msg_api_increment_missing_client_counter
void vl_msg_api_increment_missing_client_counter(void)
Definition: api_shared.c:55
vl_msg_api_handler_with_vm_node
void vl_msg_api_handler_with_vm_node(api_main_t *am, svm_region_t *vlib_rp, void *the_msg, vlib_main_t *vm, vlib_node_runtime_t *node, u8 is_private)
Definition: api_shared.c:557
vl_api_string_t::length
u32 length
Definition: api_types.h:37
vl_api_msg_range_t::first_msg_id
u16 first_msg_id
first assigned message ID
Definition: api_common.h:117
fformat
__clib_export word fformat(FILE *f, char *fmt,...)
Definition: format.c:466
msgbuf_
Message header structure.
Definition: api_common.h:140
vl_api_string_t
Definition: api_types.h:35
vl_api_from_api_to_new_vec
u8 * vl_api_from_api_to_new_vec(void *mp, vl_api_string_t *astr)
Definition: api_shared.c:1202
clib_arch_is_little_endian
#define clib_arch_is_little_endian
Definition: byte_order.h:54
vl_msg_api_trace_configure
int vl_msg_api_trace_configure(api_main_t *am, vl_api_trace_which_t which, u32 nitems)
Definition: api_shared.c:366
length
char const int length
Definition: cJSON.h:163
vl_msg_api_pd_handler
int vl_msg_api_pd_handler(void *mp, int rv)
Definition: api_shared.c:1018
clib_memset
clib_memset(h->entries, 0, sizeof(h->entries[0]) *entries)
vlib_main_t
Definition: main.h:102
vl_msg_api_get_msg_index
u32 vl_msg_api_get_msg_index(u8 *name_and_crc)
Definition: api_shared.c:1119
svm_region_
Definition: svm_common.h:35
u8
unsigned char u8
Definition: types.h:56
a
a
Definition: bitmap.h:525
my_api_main
__thread api_main_t * my_api_main
Definition: api_shared.c:45
unix.h
elog_main_t
Definition: elog.h:132
i
int i
Definition: flowhash_template.h:376
clib_warning
#define clib_warning(format, args...)
Definition: error.h:59
svm_queue_sub
int svm_queue_sub(svm_queue_t *q, u8 *elem, svm_q_conditional_wait_t cond, u32 time)
Definition: queue.c:369
rv
int __clib_unused rv
Definition: application.c:491
cleanup
static void cleanup(void)
Definition: client.c:98
ELOG_DATA
#define ELOG_DATA(em, f)
Definition: elog.h:484
SVM_Q_WAIT
@ SVM_Q_WAIT
blocking call - best used in combination with condvars, for eventfds we don't yield the cpu
Definition: queue.h:42
vlib_node_runtime_t
Definition: node.h:454
vl_msg_api_config
void vl_msg_api_config(vl_msg_api_msg_config_t *c)
Definition: api_shared.c:822
PREDICT_TRUE
#define PREDICT_TRUE(x)
Definition: clib.h:125
vl_msg_api_max_length
u32 vl_msg_api_max_length(void *mp)
Definition: api_shared.c:926
svm_push_data_heap
static void * svm_push_data_heap(svm_region_t *rp)
Definition: svm.h:86
vl_api_from_api_to_new_c_string
char * vl_api_from_api_to_new_c_string(vl_api_string_t *astr)
Definition: api_shared.c:1218
api_main_t::is_mp_safe
u8 * is_mp_safe
Message is mp safe vector.
Definition: api_common.h:251
vl_msg_api_get_msg_length
u32 vl_msg_api_get_msg_length(void *msg_arg)
Definition: api_shared.c:791
hash_pair_t
Definition: hash.h:159
vl_msg_api_trace_save
int vl_msg_api_trace_save(api_main_t *am, vl_api_trace_which_t which, FILE *fp)
Definition: api_shared.c:227
vl_msg_api_cleanup_handler
void vl_msg_api_cleanup_handler(void *the_msg)
Definition: api_shared.c:753