FD.io VPP  v20.09-64-g4f7b92f0a
Vector Packet Processing
ip4_full_reass.c
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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 
16 /**
17  * @file
18  * @brief IPv4 Full Reassembly.
19  *
20  * This file contains the source code for IPv4 full reassembly.
21  */
22 
23 #include <vppinfra/vec.h>
24 #include <vnet/vnet.h>
25 #include <vnet/ip/ip.h>
26 #include <vppinfra/fifo.h>
27 #include <vppinfra/bihash_16_8.h>
29 #include <stddef.h>
30 
31 #define MSEC_PER_SEC 1000
32 #define IP4_REASS_TIMEOUT_DEFAULT_MS 100
33 #define IP4_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS 10000 // 10 seconds default
34 #define IP4_REASS_MAX_REASSEMBLIES_DEFAULT 1024
35 #define IP4_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT 3
36 #define IP4_REASS_HT_LOAD_FACTOR (0.75)
37 
38 #define IP4_REASS_DEBUG_BUFFERS 0
39 #if IP4_REASS_DEBUG_BUFFERS
40 #define IP4_REASS_DEBUG_BUFFER(bi, what) \
41  do \
42  { \
43  u32 _bi = bi; \
44  printf (#what "buffer %u", _bi); \
45  vlib_buffer_t *_b = vlib_get_buffer (vm, _bi); \
46  while (_b->flags & VLIB_BUFFER_NEXT_PRESENT) \
47  { \
48  _bi = _b->next_buffer; \
49  printf ("[%u]", _bi); \
50  _b = vlib_get_buffer (vm, _bi); \
51  } \
52  printf ("\n"); \
53  fflush (stdout); \
54  } \
55  while (0)
56 #else
57 #define IP4_REASS_DEBUG_BUFFER(...)
58 #endif
59 
60 typedef enum
61 {
68 
69 typedef struct
70 {
71  union
72  {
73  struct
74  {
81  };
82  u64 as_u64[2];
83  };
85 
86 typedef union
87 {
88  struct
89  {
92  };
95 
96 typedef union
97 {
98  struct
99  {
102  };
105 
108 {
110  return vnb->ip.reass.range_first - vnb->ip.reass.fragment_first;
111 }
112 
115 {
117  return clib_min (vnb->ip.reass.range_last, vnb->ip.reass.fragment_last) -
118  (vnb->ip.reass.fragment_first +
120 }
121 
122 typedef struct
123 {
124  // hash table key
126  // time when last packet was received
128  // internal id of this reassembly
130  // buffer index of first buffer in this reassembly context
132  // last octet of packet, ~0 until fragment without more_fragments arrives
134  // length of data collected so far
136  // trace operation counter
138  // next index - used by non-feature node
140  // error next index - used by custom apps (~0 if not used)
142  // minimum fragment length for this reassembly - used to estimate MTU
144  // number of fragments in this reassembly
146  // thread owning memory for this context (whose pool contains this ctx)
148  // thread which received fragment with offset 0 and which sends out the
149  // completed reassembly
152 
153 typedef struct
154 {
160 
161 typedef struct
162 {
163  // IPv4 config
167  // maximum number of fragments in one reassembly
169  // maximum number of reassemblies
171 
172  // IPv4 runtime
173  clib_bihash_16_8_t hash;
174  // per-thread data
176 
177  // convenience
179 
180  // node index of ip4-drop node
183 
184  /** Worker handoff */
187 
188  // reference count for enabling/disabling feature - per interface
191 
193 
194 #ifndef CLIB_MARCH_VARIANT
196 #endif /* CLIB_MARCH_VARIANT */
197 
198 typedef enum
199 {
205 
206 typedef enum
207 {
215 
216 typedef struct
217 {
225 
226 typedef struct
227 {
228  ip4_full_reass_trace_operation_e action;
241 
244 
245 static void
248 {
249  vlib_buffer_t *b = vlib_get_buffer (vm, bi);
251  trace->range_first = vnb->ip.reass.range_first;
252  trace->range_last = vnb->ip.reass.range_last;
255  trace->range_bi = bi;
256 }
257 
258 static u8 *
260 {
262  va_arg (*args, ip4_full_reass_range_trace_t *);
263  s =
264  format (s, "range: [%u, %u], off %d, len %u, bi %u", trace->range_first,
265  trace->range_last, trace->data_offset, trace->data_len,
266  trace->range_bi);
267  return s;
268 }
269 
270 static u8 *
271 format_ip4_full_reass_trace (u8 * s, va_list * args)
272 {
273  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
274  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
275  ip4_full_reass_trace_t *t = va_arg (*args, ip4_full_reass_trace_t *);
276  u32 indent = 0;
277  if (~0 != t->reass_id)
278  {
279  if (t->is_after_handoff)
280  {
281  s =
282  format (s, "%U\n", format_ip4_header, &t->ip4_header,
283  sizeof (t->ip4_header));
284  indent = 2;
285  }
286  s =
287  format (s, "%Ureass id: %u, op id: %u, ", format_white_space, indent,
288  t->reass_id, t->op_id);
289  indent = format_get_indent (s);
290  s =
291  format (s,
292  "first bi: %u, data len: %u, ip/fragment[%u, %u]",
294  t->fragment_last);
295  }
296  switch (t->action)
297  {
298  case RANGE_SHRINK:
299  s = format (s, "\n%Ushrink %U by %u", format_white_space, indent,
301  t->size_diff);
302  break;
303  case RANGE_DISCARD:
304  s = format (s, "\n%Udiscard %U", format_white_space, indent,
306  break;
307  case RANGE_NEW:
308  s = format (s, "\n%Unew %U", format_white_space, indent,
310  break;
311  case RANGE_OVERLAP:
312  s = format (s, "\n%Uoverlapping/ignored %U", format_white_space, indent,
314  break;
315  case FINALIZE:
316  s = format (s, "\n%Ufinalize reassembly", format_white_space, indent);
317  break;
318  case HANDOFF:
319  s =
320  format (s, "handoff from thread #%u to thread #%u", t->thread_id,
321  t->thread_id_to);
322  break;
323  }
324  return s;
325 }
326 
327 static void
330  ip4_full_reass_t * reass, u32 bi,
331  ip4_full_reass_trace_operation_e action,
332  u32 size_diff, u32 thread_id_to)
333 {
334  vlib_buffer_t *b = vlib_get_buffer (vm, bi);
336  bool is_after_handoff = false;
338  {
339  is_after_handoff = true;
340  }
341  ip4_full_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
342  t->is_after_handoff = is_after_handoff;
343  if (t->is_after_handoff)
344  {
346  clib_min (sizeof (t->ip4_header), b->current_length));
347  }
348  if (reass)
349  {
350  t->reass_id = reass->id;
351  t->op_id = reass->trace_op_counter;
352  t->trace_range.first_bi = reass->first_bi;
353  t->total_data_len = reass->data_len;
354  ++reass->trace_op_counter;
355  }
356  else
357  {
358  t->reass_id = ~0;
359  t->op_id = 0;
360  t->trace_range.first_bi = 0;
361  t->total_data_len = 0;
362  }
363  t->action = action;
365  t->size_diff = size_diff;
366  t->thread_id = vm->thread_index;
367  t->thread_id_to = thread_id_to;
368  t->fragment_first = vnb->ip.reass.fragment_first;
369  t->fragment_last = vnb->ip.reass.fragment_last;
370 #if 0
371  static u8 *s = NULL;
372  s = format (s, "%U", format_ip4_full_reass_trace, NULL, NULL, t);
373  printf ("%.*s\n", vec_len (s), s);
374  fflush (stdout);
375  vec_reset_length (s);
376 #endif
377 }
378 
379 always_inline void
381  ip4_full_reass_t * reass)
382 {
383  pool_put (rt->pool, reass);
384  --rt->reass_n;
385 }
386 
387 always_inline void
390  ip4_full_reass_t * reass)
391 {
393  kv.key[0] = reass->key.as_u64[0];
394  kv.key[1] = reass->key.as_u64[1];
395  clib_bihash_add_del_16_8 (&rm->hash, &kv, 0);
396  return ip4_full_reass_free_ctx (rt, reass);
397 }
398 
399 always_inline void
402 {
403  u32 range_bi = reass->first_bi;
404  vlib_buffer_t *range_b;
405  vnet_buffer_opaque_t *range_vnb;
406  u32 *to_free = NULL;
407  while (~0 != range_bi)
408  {
409  range_b = vlib_get_buffer (vm, range_bi);
410  range_vnb = vnet_buffer (range_b);
411  u32 bi = range_bi;
412  while (~0 != bi)
413  {
414  vec_add1 (to_free, bi);
415  vlib_buffer_t *b = vlib_get_buffer (vm, bi);
416  if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
417  {
418  bi = b->next_buffer;
419  b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
420  }
421  else
422  {
423  bi = ~0;
424  }
425  }
426  range_bi = range_vnb->ip.reass.next_range_bi;
427  }
428  /* send to next_error_index */
429  if (~0 != reass->error_next_index)
430  {
431  u32 n_left_to_next, *to_next, next_index;
432 
433  next_index = reass->error_next_index;
434  u32 bi = ~0;
435 
436  while (vec_len (to_free) > 0)
437  {
438  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
439 
440  while (vec_len (to_free) > 0 && n_left_to_next > 0)
441  {
442  bi = vec_pop (to_free);
443 
444  if (~0 != bi)
445  {
446  to_next[0] = bi;
447  to_next += 1;
448  n_left_to_next -= 1;
449  }
450  }
451  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
452  }
453  }
454  else
455  {
456  vlib_buffer_free (vm, to_free, vec_len (to_free));
457  }
458 }
459 
460 always_inline void
462 {
463  reass->first_bi = ~0;
464  reass->last_packet_octet = ~0;
465  reass->data_len = 0;
466  reass->next_index = ~0;
467  reass->error_next_index = ~0;
468 }
469 
474  ip4_full_reass_kv_t * kv, u8 * do_handoff)
475 {
476  ip4_full_reass_t *reass;
477  f64 now;
478 
479 again:
480 
481  reass = NULL;
482  now = vlib_time_now (vm);
483  if (!clib_bihash_search_16_8 (&rm->hash, &kv->kv, &kv->kv))
484  {
486  {
487  *do_handoff = 1;
488  return NULL;
489  }
490  reass =
493  kv->v.reass_index);
494 
495  if (now > reass->last_heard + rm->timeout)
496  {
497  ip4_full_reass_drop_all (vm, node, rm, reass);
498  ip4_full_reass_free (rm, rt, reass);
499  reass = NULL;
500  }
501  }
502 
503  if (reass)
504  {
505  reass->last_heard = now;
506  return reass;
507  }
508 
509  if (rt->reass_n >= rm->max_reass_n)
510  {
511  reass = NULL;
512  return reass;
513  }
514  else
515  {
516  pool_get (rt->pool, reass);
517  clib_memset (reass, 0, sizeof (*reass));
518  reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter;
520  ++rt->id_counter;
521  ip4_full_reass_init (reass);
522  ++rt->reass_n;
523  }
524 
525  reass->key.as_u64[0] = kv->kv.key[0];
526  reass->key.as_u64[1] = kv->kv.key[1];
527  kv->v.reass_index = (reass - rt->pool);
529  reass->last_heard = now;
530 
531  int rv = clib_bihash_add_del_16_8 (&rm->hash, &kv->kv, 2);
532  if (rv)
533  {
534  ip4_full_reass_free_ctx (rt, reass);
535  reass = NULL;
536  // if other worker created a context already work with the other copy
537  if (-2 == rv)
538  goto again;
539  }
540 
541  return reass;
542 }
543 
544 always_inline ip4_full_reass_rc_t
548  ip4_full_reass_t * reass, u32 * bi0,
549  u32 * next0, u32 * error0, bool is_custom_app)
550 {
551  vlib_buffer_t *first_b = vlib_get_buffer (vm, reass->first_bi);
552  vlib_buffer_t *last_b = NULL;
553  u32 sub_chain_bi = reass->first_bi;
554  u32 total_length = 0;
555  u32 buf_cnt = 0;
556  do
557  {
558  u32 tmp_bi = sub_chain_bi;
559  vlib_buffer_t *tmp = vlib_get_buffer (vm, tmp_bi);
561  vnet_buffer_opaque_t *vnb = vnet_buffer (tmp);
562  if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
563  !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
564  {
566  }
567 
569  u32 trim_front =
571  u32 trim_end =
572  vlib_buffer_length_in_chain (vm, tmp) - trim_front - data_len;
573  if (tmp_bi == reass->first_bi)
574  {
575  /* first buffer - keep ip4 header */
577  {
579  }
580  trim_front = 0;
581  trim_end = vlib_buffer_length_in_chain (vm, tmp) - data_len -
582  ip4_header_bytes (ip);
583  if (!(vlib_buffer_length_in_chain (vm, tmp) - trim_end > 0))
584  {
586  }
587  }
588  u32 keep_data =
589  vlib_buffer_length_in_chain (vm, tmp) - trim_front - trim_end;
590  while (1)
591  {
592  ++buf_cnt;
593  if (trim_front)
594  {
595  if (trim_front > tmp->current_length)
596  {
597  /* drop whole buffer */
598  u32 to_be_freed_bi = tmp_bi;
599  trim_front -= tmp->current_length;
600  if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
601  {
603  }
604  tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
605  tmp_bi = tmp->next_buffer;
606  tmp->next_buffer = 0;
607  tmp = vlib_get_buffer (vm, tmp_bi);
608  vlib_buffer_free_one (vm, to_be_freed_bi);
609  continue;
610  }
611  else
612  {
613  vlib_buffer_advance (tmp, trim_front);
614  trim_front = 0;
615  }
616  }
617  if (keep_data)
618  {
619  if (last_b)
620  {
621  last_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
622  last_b->next_buffer = tmp_bi;
623  }
624  last_b = tmp;
625  if (keep_data <= tmp->current_length)
626  {
627  tmp->current_length = keep_data;
628  keep_data = 0;
629  }
630  else
631  {
632  keep_data -= tmp->current_length;
633  if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
634  {
636  }
637  }
638  total_length += tmp->current_length;
639  if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT)
640  {
641  tmp_bi = tmp->next_buffer;
642  tmp = vlib_get_buffer (vm, tmp->next_buffer);
643  }
644  else
645  {
646  break;
647  }
648  }
649  else
650  {
651  u32 to_be_freed_bi = tmp_bi;
652  if (reass->first_bi == tmp_bi)
653  {
655  }
656  if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT)
657  {
658  tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
659  tmp_bi = tmp->next_buffer;
660  tmp->next_buffer = 0;
661  tmp = vlib_get_buffer (vm, tmp_bi);
662  vlib_buffer_free_one (vm, to_be_freed_bi);
663  }
664  else
665  {
666  tmp->next_buffer = 0;
667  vlib_buffer_free_one (vm, to_be_freed_bi);
668  break;
669  }
670  }
671  }
672  sub_chain_bi =
673  vnet_buffer (vlib_get_buffer (vm, sub_chain_bi))->ip.
674  reass.next_range_bi;
675  }
676  while (~0 != sub_chain_bi);
677 
678  if (!last_b)
679  {
681  }
682  last_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
683 
684  if (total_length < first_b->current_length)
685  {
687  }
688  total_length -= first_b->current_length;
689  first_b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
690  first_b->total_length_not_including_first_buffer = total_length;
693  ip->length = clib_host_to_net_u16 (first_b->current_length + total_length);
694  ip->checksum = ip4_header_checksum (ip);
695  if (!vlib_buffer_chain_linearize (vm, first_b))
696  {
697  return IP4_REASS_RC_NO_BUF;
698  }
699  // reset to reconstruct the mbuf linking
700  first_b->flags &= ~VLIB_BUFFER_EXT_HDR_VALID;
701  if (PREDICT_FALSE (first_b->flags & VLIB_BUFFER_IS_TRACED))
702  {
703  ip4_full_reass_add_trace (vm, node, rm, reass, reass->first_bi,
704  FINALIZE, 0, ~0);
705 #if 0
706  // following code does a hexdump of packet fragments to stdout ...
707  do
708  {
709  u32 bi = reass->first_bi;
710  u8 *s = NULL;
711  while (~0 != bi)
712  {
713  vlib_buffer_t *b = vlib_get_buffer (vm, bi);
714  s = format (s, "%u: %U\n", bi, format_hexdump,
716  if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
717  {
718  bi = b->next_buffer;
719  }
720  else
721  {
722  break;
723  }
724  }
725  printf ("%.*s\n", vec_len (s), s);
726  fflush (stdout);
727  vec_free (s);
728  }
729  while (0);
730 #endif
731  }
732  *bi0 = reass->first_bi;
733  if (!is_custom_app)
734  {
735  *next0 = IP4_FULL_REASS_NEXT_INPUT;
736  }
737  else
738  {
739  *next0 = reass->next_index;
740  }
741  vnet_buffer (first_b)->ip.reass.estimated_mtu = reass->min_fragment_length;
742  *error0 = IP4_ERROR_NONE;
743  ip4_full_reass_free (rm, rt, reass);
744  reass = NULL;
745  return IP4_REASS_RC_OK;
746 }
747 
748 always_inline ip4_full_reass_rc_t
752  ip4_full_reass_t * reass,
753  u32 prev_range_bi, u32 new_next_bi)
754 {
755  vlib_buffer_t *new_next_b = vlib_get_buffer (vm, new_next_bi);
756  vnet_buffer_opaque_t *new_next_vnb = vnet_buffer (new_next_b);
757  if (~0 != prev_range_bi)
758  {
759  vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi);
760  vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b);
761  new_next_vnb->ip.reass.next_range_bi = prev_vnb->ip.reass.next_range_bi;
762  prev_vnb->ip.reass.next_range_bi = new_next_bi;
763  }
764  else
765  {
766  if (~0 != reass->first_bi)
767  {
768  new_next_vnb->ip.reass.next_range_bi = reass->first_bi;
769  }
770  reass->first_bi = new_next_bi;
771  }
772  vnet_buffer_opaque_t *vnb = vnet_buffer (new_next_b);
773  if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
774  !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
775  {
777  }
778  reass->data_len += ip4_full_reass_buffer_get_data_len (new_next_b);
779  return IP4_REASS_RC_OK;
780 }
781 
782 always_inline ip4_full_reass_rc_t
784  vlib_node_runtime_t * node,
786  ip4_full_reass_t * reass,
787  u32 prev_range_bi, u32 discard_bi)
788 {
789  vlib_buffer_t *discard_b = vlib_get_buffer (vm, discard_bi);
790  vnet_buffer_opaque_t *discard_vnb = vnet_buffer (discard_b);
791  if (~0 != prev_range_bi)
792  {
793  vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi);
794  vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b);
795  if (!(prev_vnb->ip.reass.next_range_bi == discard_bi))
796  {
798  }
799  prev_vnb->ip.reass.next_range_bi = discard_vnb->ip.reass.next_range_bi;
800  }
801  else
802  {
803  reass->first_bi = discard_vnb->ip.reass.next_range_bi;
804  }
805  vnet_buffer_opaque_t *vnb = vnet_buffer (discard_b);
806  if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
807  !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
808  {
810  }
811  reass->data_len -= ip4_full_reass_buffer_get_data_len (discard_b);
812  while (1)
813  {
814  u32 to_be_freed_bi = discard_bi;
815  if (PREDICT_FALSE (discard_b->flags & VLIB_BUFFER_IS_TRACED))
816  {
817  ip4_full_reass_add_trace (vm, node, rm, reass, discard_bi,
818  RANGE_DISCARD, 0, ~0);
819  }
820  if (discard_b->flags & VLIB_BUFFER_NEXT_PRESENT)
821  {
822  discard_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
823  discard_bi = discard_b->next_buffer;
824  discard_b->next_buffer = 0;
825  discard_b = vlib_get_buffer (vm, discard_bi);
826  vlib_buffer_free_one (vm, to_be_freed_bi);
827  }
828  else
829  {
830  discard_b->next_buffer = 0;
831  vlib_buffer_free_one (vm, to_be_freed_bi);
832  break;
833  }
834  }
835  return IP4_REASS_RC_OK;
836 }
837 
838 always_inline ip4_full_reass_rc_t
842  ip4_full_reass_t * reass, u32 * bi0, u32 * next0,
843  u32 * error0, bool is_custom_app,
844  u32 * handoff_thread_idx)
845 {
846  vlib_buffer_t *fb = vlib_get_buffer (vm, *bi0);
847  vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
848  if (is_custom_app)
849  {
850  // store (error_)next_index before it's overwritten
851  reass->next_index = fvnb->ip.reass.next_index;
852  reass->error_next_index = fvnb->ip.reass.error_next_index;
853  }
854  ip4_full_reass_rc_t rc = IP4_REASS_RC_OK;
855  int consumed = 0;
857  const u32 fragment_first = ip4_get_fragment_offset_bytes (fip);
858  const u32 fragment_length =
859  clib_net_to_host_u16 (fip->length) - ip4_header_bytes (fip);
860  const u32 fragment_last = fragment_first + fragment_length - 1;
861  fvnb->ip.reass.fragment_first = fragment_first;
862  fvnb->ip.reass.fragment_last = fragment_last;
863  int more_fragments = ip4_get_fragment_more (fip);
864  u32 candidate_range_bi = reass->first_bi;
865  u32 prev_range_bi = ~0;
866  fvnb->ip.reass.range_first = fragment_first;
867  fvnb->ip.reass.range_last = fragment_last;
868  fvnb->ip.reass.next_range_bi = ~0;
869  if (!more_fragments)
870  {
871  reass->last_packet_octet = fragment_last;
872  }
873  if (~0 == reass->first_bi)
874  {
875  // starting a new reassembly
876  rc =
877  ip4_full_reass_insert_range_in_chain (vm, rm, rt, reass,
878  prev_range_bi, *bi0);
879  if (IP4_REASS_RC_OK != rc)
880  {
881  return rc;
882  }
883  if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
884  {
885  ip4_full_reass_add_trace (vm, node, rm, reass, *bi0, RANGE_NEW, 0,
886  ~0);
887  }
888  *bi0 = ~0;
889  reass->min_fragment_length = clib_net_to_host_u16 (fip->length);
890  reass->fragments_n = 1;
891  return IP4_REASS_RC_OK;
892  }
893  reass->min_fragment_length =
894  clib_min (clib_net_to_host_u16 (fip->length),
895  fvnb->ip.reass.estimated_mtu);
896  while (~0 != candidate_range_bi)
897  {
898  vlib_buffer_t *candidate_b = vlib_get_buffer (vm, candidate_range_bi);
899  vnet_buffer_opaque_t *candidate_vnb = vnet_buffer (candidate_b);
900  if (fragment_first > candidate_vnb->ip.reass.range_last)
901  {
902  // this fragments starts after candidate range
903  prev_range_bi = candidate_range_bi;
904  candidate_range_bi = candidate_vnb->ip.reass.next_range_bi;
905  if (candidate_vnb->ip.reass.range_last < fragment_last &&
906  ~0 == candidate_range_bi)
907  {
908  // special case - this fragment falls beyond all known ranges
909  rc =
910  ip4_full_reass_insert_range_in_chain (vm, rm, rt, reass,
911  prev_range_bi, *bi0);
912  if (IP4_REASS_RC_OK != rc)
913  {
914  return rc;
915  }
916  consumed = 1;
917  break;
918  }
919  continue;
920  }
921  if (fragment_last < candidate_vnb->ip.reass.range_first)
922  {
923  // this fragment ends before candidate range without any overlap
924  rc =
925  ip4_full_reass_insert_range_in_chain (vm, rm, rt, reass,
926  prev_range_bi, *bi0);
927  if (IP4_REASS_RC_OK != rc)
928  {
929  return rc;
930  }
931  consumed = 1;
932  }
933  else
934  {
935  if (fragment_first >= candidate_vnb->ip.reass.range_first &&
936  fragment_last <= candidate_vnb->ip.reass.range_last)
937  {
938  // this fragment is a (sub)part of existing range, ignore it
939  if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
940  {
941  ip4_full_reass_add_trace (vm, node, rm, reass, *bi0,
942  RANGE_OVERLAP, 0, ~0);
943  }
944  break;
945  }
946  int discard_candidate = 0;
947  if (fragment_first < candidate_vnb->ip.reass.range_first)
948  {
949  u32 overlap =
950  fragment_last - candidate_vnb->ip.reass.range_first + 1;
951  if (overlap < ip4_full_reass_buffer_get_data_len (candidate_b))
952  {
953  candidate_vnb->ip.reass.range_first += overlap;
954  if (reass->data_len < overlap)
955  {
957  }
958  reass->data_len -= overlap;
959  if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
960  {
961  ip4_full_reass_add_trace (vm, node, rm, reass,
962  candidate_range_bi,
963  RANGE_SHRINK, 0, ~0);
964  }
965  rc =
966  ip4_full_reass_insert_range_in_chain (vm, rm, rt, reass,
967  prev_range_bi,
968  *bi0);
969  if (IP4_REASS_RC_OK != rc)
970  {
971  return rc;
972  }
973  consumed = 1;
974  }
975  else
976  {
977  discard_candidate = 1;
978  }
979  }
980  else if (fragment_last > candidate_vnb->ip.reass.range_last)
981  {
982  u32 overlap =
983  candidate_vnb->ip.reass.range_last - fragment_first + 1;
984  if (overlap < ip4_full_reass_buffer_get_data_len (candidate_b))
985  {
986  fvnb->ip.reass.range_first += overlap;
987  if (~0 != candidate_vnb->ip.reass.next_range_bi)
988  {
989  prev_range_bi = candidate_range_bi;
990  candidate_range_bi =
991  candidate_vnb->ip.reass.next_range_bi;
992  continue;
993  }
994  else
995  {
996  // special case - last range discarded
997  rc =
999  reass,
1000  candidate_range_bi,
1001  *bi0);
1002  if (IP4_REASS_RC_OK != rc)
1003  {
1004  return rc;
1005  }
1006  consumed = 1;
1007  }
1008  }
1009  else
1010  {
1011  discard_candidate = 1;
1012  }
1013  }
1014  else
1015  {
1016  discard_candidate = 1;
1017  }
1018  if (discard_candidate)
1019  {
1020  u32 next_range_bi = candidate_vnb->ip.reass.next_range_bi;
1021  // discard candidate range, probe next range
1022  rc =
1023  ip4_full_reass_remove_range_from_chain (vm, node, rm, reass,
1024  prev_range_bi,
1025  candidate_range_bi);
1026  if (IP4_REASS_RC_OK != rc)
1027  {
1028  return rc;
1029  }
1030  if (~0 != next_range_bi)
1031  {
1032  candidate_range_bi = next_range_bi;
1033  continue;
1034  }
1035  else
1036  {
1037  // special case - last range discarded
1038  rc =
1039  ip4_full_reass_insert_range_in_chain (vm, rm, rt, reass,
1040  prev_range_bi,
1041  *bi0);
1042  if (IP4_REASS_RC_OK != rc)
1043  {
1044  return rc;
1045  }
1046  consumed = 1;
1047  }
1048  }
1049  }
1050  break;
1051  }
1052  ++reass->fragments_n;
1053  if (consumed)
1054  {
1055  if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
1056  {
1057  ip4_full_reass_add_trace (vm, node, rm, reass, *bi0, RANGE_NEW, 0,
1058  ~0);
1059  }
1060  }
1061  if (~0 != reass->last_packet_octet &&
1062  reass->data_len == reass->last_packet_octet + 1)
1063  {
1064  *handoff_thread_idx = reass->sendout_thread_index;
1065  int handoff =
1067  rc =
1068  ip4_full_reass_finalize (vm, node, rm, rt, reass, bi0, next0, error0,
1069  is_custom_app);
1070  if (IP4_REASS_RC_OK == rc && handoff)
1071  {
1072  rc = IP4_REASS_RC_HANDOFF;
1073  }
1074  }
1075  else
1076  {
1077  if (consumed)
1078  {
1079  *bi0 = ~0;
1080  if (reass->fragments_n > rm->max_reass_len)
1081  {
1083  }
1084  }
1085  else
1086  {
1087  *next0 = IP4_FULL_REASS_NEXT_DROP;
1088  *error0 = IP4_ERROR_REASS_DUPLICATE_FRAGMENT;
1089  }
1090  }
1091  return rc;
1092 }
1093 
1096  vlib_frame_t * frame, bool is_feature,
1097  bool is_custom_app)
1098 {
1099  u32 *from = vlib_frame_vector_args (frame);
1100  u32 n_left_from, n_left_to_next, *to_next, next_index;
1103  clib_spinlock_lock (&rt->lock);
1104 
1105  n_left_from = frame->n_vectors;
1106  next_index = node->cached_next_index;
1107  while (n_left_from > 0)
1108  {
1109  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1110 
1111  while (n_left_from > 0 && n_left_to_next > 0)
1112  {
1113  u32 bi0;
1114  vlib_buffer_t *b0;
1115  u32 next0;
1116  u32 error0 = IP4_ERROR_NONE;
1117 
1118  bi0 = from[0];
1119  b0 = vlib_get_buffer (vm, bi0);
1120 
1122  if (!ip4_get_fragment_more (ip0) && !ip4_get_fragment_offset (ip0))
1123  {
1124  // this is a whole packet - no fragmentation
1125  if (!is_custom_app)
1126  {
1127  next0 = IP4_FULL_REASS_NEXT_INPUT;
1128  }
1129  else
1130  {
1131  next0 = vnet_buffer (b0)->ip.reass.next_index;
1132  }
1133  goto packet_enqueue;
1134  }
1135  const u32 fragment_first = ip4_get_fragment_offset_bytes (ip0);
1136  const u32 fragment_length =
1137  clib_net_to_host_u16 (ip0->length) - ip4_header_bytes (ip0);
1138  const u32 fragment_last = fragment_first + fragment_length - 1;
1139  if (fragment_first > fragment_last || fragment_first + fragment_length > UINT16_MAX - 20 || (fragment_length < 8 && ip4_get_fragment_more (ip0))) // 8 is minimum frag length per RFC 791
1140  {
1141  next0 = IP4_FULL_REASS_NEXT_DROP;
1142  error0 = IP4_ERROR_REASS_MALFORMED_PACKET;
1143  goto packet_enqueue;
1144  }
1146  u8 do_handoff = 0;
1147 
1148  kv.k.as_u64[0] =
1150  vnet_buffer (b0)->sw_if_index[VLIB_RX]) |
1151  (u64) ip0->src_address.as_u32 << 32;
1152  kv.k.as_u64[1] =
1153  (u64) ip0->dst_address.
1154  as_u32 | (u64) ip0->fragment_id << 32 | (u64) ip0->protocol << 48;
1155 
1156  ip4_full_reass_t *reass =
1157  ip4_full_reass_find_or_create (vm, node, rm, rt, &kv,
1158  &do_handoff);
1159 
1160  if (reass)
1161  {
1162  const u32 fragment_first = ip4_get_fragment_offset_bytes (ip0);
1163  if (0 == fragment_first)
1164  {
1165  reass->sendout_thread_index = vm->thread_index;
1166  }
1167  }
1168 
1169  if (PREDICT_FALSE (do_handoff))
1170  {
1172  vnet_buffer (b0)->ip.reass.owner_thread_index =
1174  }
1175  else if (reass)
1176  {
1177  u32 handoff_thread_idx;
1178  switch (ip4_full_reass_update
1179  (vm, node, rm, rt, reass, &bi0, &next0,
1180  &error0, is_custom_app, &handoff_thread_idx))
1181  {
1182  case IP4_REASS_RC_OK:
1183  /* nothing to do here */
1184  break;
1185  case IP4_REASS_RC_HANDOFF:
1187  b0 = vlib_get_buffer (vm, bi0);
1188  vnet_buffer (b0)->ip.reass.owner_thread_index =
1189  handoff_thread_idx;
1190  break;
1193  IP4_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG,
1194  1);
1195  ip4_full_reass_drop_all (vm, node, rm, reass);
1196  ip4_full_reass_free (rm, rt, reass);
1197  goto next_packet;
1198  break;
1199  case IP4_REASS_RC_NO_BUF:
1201  IP4_ERROR_REASS_NO_BUF, 1);
1202  ip4_full_reass_drop_all (vm, node, rm, reass);
1203  ip4_full_reass_free (rm, rt, reass);
1204  goto next_packet;
1205  break;
1207  /* drop everything and start with a clean slate */
1209  IP4_ERROR_REASS_INTERNAL_ERROR,
1210  1);
1211  ip4_full_reass_drop_all (vm, node, rm, reass);
1212  ip4_full_reass_free (rm, rt, reass);
1213  goto next_packet;
1214  break;
1215  }
1216  }
1217  else
1218  {
1219  next0 = IP4_FULL_REASS_NEXT_DROP;
1220  error0 = IP4_ERROR_REASS_LIMIT_REACHED;
1221  }
1222 
1223 
1224  packet_enqueue:
1225 
1226  if (bi0 != ~0)
1227  {
1228  to_next[0] = bi0;
1229  to_next += 1;
1230  n_left_to_next -= 1;
1231 
1232  /* bi0 might have been updated by reass_finalize, reload */
1233  b0 = vlib_get_buffer (vm, bi0);
1234  if (IP4_ERROR_NONE != error0)
1235  {
1236  b0->error = node->errors[error0];
1237  }
1238 
1239  if (next0 == IP4_FULL_REASS_NEXT_HANDOFF)
1240  {
1241  if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1242  {
1243  ip4_full_reass_add_trace (vm, node, rm, NULL, bi0,
1244  HANDOFF, 0,
1245  vnet_buffer (b0)->ip.
1246  reass.owner_thread_index);
1247  }
1248  }
1249  else if (is_feature && IP4_ERROR_NONE == error0)
1250  {
1251  vnet_feature_next (&next0, b0);
1252  }
1253  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1254  to_next, n_left_to_next,
1255  bi0, next0);
1256  IP4_REASS_DEBUG_BUFFER (bi0, enqueue_next);
1257  }
1258 
1259  next_packet:
1260  from += 1;
1261  n_left_from -= 1;
1262  }
1263 
1264  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1265  }
1266 
1267  clib_spinlock_unlock (&rt->lock);
1268  return frame->n_vectors;
1269 }
1270 
1272 #define _(sym, string) string,
1274 #undef _
1275 };
1276 
1277 VLIB_NODE_FN (ip4_full_reass_node) (vlib_main_t * vm,
1279  vlib_frame_t * frame)
1280 {
1281  return ip4_full_reass_inline (vm, node, frame, false /* is_feature */ ,
1282  false /* is_custom_app */ );
1283 }
1284 
1285 /* *INDENT-OFF* */
1286 VLIB_REGISTER_NODE (ip4_full_reass_node) = {
1287  .name = "ip4-full-reassembly",
1288  .vector_size = sizeof (u32),
1289  .format_trace = format_ip4_full_reass_trace,
1290  .n_errors = ARRAY_LEN (ip4_full_reass_error_strings),
1291  .error_strings = ip4_full_reass_error_strings,
1292  .n_next_nodes = IP4_FULL_REASS_N_NEXT,
1293  .next_nodes =
1294  {
1295  [IP4_FULL_REASS_NEXT_INPUT] = "ip4-input",
1296  [IP4_FULL_REASS_NEXT_DROP] = "ip4-drop",
1297  [IP4_FULL_REASS_NEXT_HANDOFF] = "ip4-full-reassembly-handoff",
1298 
1299  },
1300 };
1301 /* *INDENT-ON* */
1302 
1303 VLIB_NODE_FN (ip4_full_reass_node_feature) (vlib_main_t * vm,
1305  vlib_frame_t * frame)
1306 {
1307  return ip4_full_reass_inline (vm, node, frame, true /* is_feature */ ,
1308  false /* is_custom_app */ );
1309 }
1310 
1311 /* *INDENT-OFF* */
1312 VLIB_REGISTER_NODE (ip4_full_reass_node_feature) = {
1313  .name = "ip4-full-reassembly-feature",
1314  .vector_size = sizeof (u32),
1315  .format_trace = format_ip4_full_reass_trace,
1316  .n_errors = ARRAY_LEN (ip4_full_reass_error_strings),
1317  .error_strings = ip4_full_reass_error_strings,
1318  .n_next_nodes = IP4_FULL_REASS_N_NEXT,
1319  .next_nodes =
1320  {
1321  [IP4_FULL_REASS_NEXT_INPUT] = "ip4-input",
1322  [IP4_FULL_REASS_NEXT_DROP] = "ip4-drop",
1323  [IP4_FULL_REASS_NEXT_HANDOFF] = "ip4-full-reass-feature-hoff",
1324  },
1325 };
1326 /* *INDENT-ON* */
1327 
1328 /* *INDENT-OFF* */
1329 VNET_FEATURE_INIT (ip4_full_reass_feature, static) = {
1330  .arc_name = "ip4-unicast",
1331  .node_name = "ip4-full-reassembly-feature",
1332  .runs_before = VNET_FEATURES ("ip4-lookup",
1333  "ipsec4-input-feature"),
1334  .runs_after = 0,
1335 };
1336 /* *INDENT-ON* */
1337 
1338 #ifndef CLIB_MARCH_VARIANT
1341 {
1343  u32 nbuckets;
1344  u8 i;
1345 
1346  nbuckets = (u32) (rm->max_reass_n / IP4_REASS_HT_LOAD_FACTOR);
1347 
1348  for (i = 0; i < 31; i++)
1349  if ((1 << i) >= nbuckets)
1350  break;
1351  nbuckets = 1 << i;
1352 
1353  return nbuckets;
1354 }
1355 #endif /* CLIB_MARCH_VARIANT */
1356 
1357 typedef enum
1358 {
1361 
1362 typedef struct
1363 {
1364  int failure;
1365  clib_bihash_16_8_t *new_hash;
1367 
1368 #ifndef CLIB_MARCH_VARIANT
1369 static int
1371 {
1372  ip4_rehash_cb_ctx *ctx = _ctx;
1373  if (clib_bihash_add_del_16_8 (ctx->new_hash, kv, 1))
1374  {
1375  ctx->failure = 1;
1376  }
1377  return (BIHASH_WALK_CONTINUE);
1378 }
1379 
1380 static void
1381 ip4_full_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
1382  u32 max_reassembly_length,
1383  u32 expire_walk_interval_ms)
1384 {
1385  ip4_full_reass_main.timeout_ms = timeout_ms;
1386  ip4_full_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
1387  ip4_full_reass_main.max_reass_n = max_reassemblies;
1388  ip4_full_reass_main.max_reass_len = max_reassembly_length;
1389  ip4_full_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
1390 }
1391 
1393 ip4_full_reass_set (u32 timeout_ms, u32 max_reassemblies,
1394  u32 max_reassembly_length, u32 expire_walk_interval_ms)
1395 {
1396  u32 old_nbuckets = ip4_full_reass_get_nbuckets ();
1397  ip4_full_reass_set_params (timeout_ms, max_reassemblies,
1398  max_reassembly_length, expire_walk_interval_ms);
1399  vlib_process_signal_event (ip4_full_reass_main.vlib_main,
1400  ip4_full_reass_main.ip4_full_reass_expire_node_idx,
1402  u32 new_nbuckets = ip4_full_reass_get_nbuckets ();
1403  if (ip4_full_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
1404  {
1405  clib_bihash_16_8_t new_hash;
1406  clib_memset (&new_hash, 0, sizeof (new_hash));
1408  ctx.failure = 0;
1409  ctx.new_hash = &new_hash;
1410  clib_bihash_init_16_8 (&new_hash, "ip4-dr", new_nbuckets,
1411  new_nbuckets * 1024);
1412  clib_bihash_foreach_key_value_pair_16_8 (&ip4_full_reass_main.hash,
1413  ip4_rehash_cb, &ctx);
1414  if (ctx.failure)
1415  {
1416  clib_bihash_free_16_8 (&new_hash);
1417  return -1;
1418  }
1419  else
1420  {
1421  clib_bihash_free_16_8 (&ip4_full_reass_main.hash);
1422  clib_memcpy_fast (&ip4_full_reass_main.hash, &new_hash,
1423  sizeof (ip4_full_reass_main.hash));
1424  clib_bihash_copied (&ip4_full_reass_main.hash, &new_hash);
1425  }
1426  }
1427  return 0;
1428 }
1429 
1431 ip4_full_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
1432  u32 * max_reassembly_length,
1433  u32 * expire_walk_interval_ms)
1434 {
1435  *timeout_ms = ip4_full_reass_main.timeout_ms;
1436  *max_reassemblies = ip4_full_reass_main.max_reass_n;
1437  *max_reassembly_length = ip4_full_reass_main.max_reass_len;
1438  *expire_walk_interval_ms = ip4_full_reass_main.expire_walk_interval_ms;
1439  return 0;
1440 }
1441 
1442 static clib_error_t *
1444 {
1446  clib_error_t *error = 0;
1447  u32 nbuckets;
1448  vlib_node_t *node;
1449 
1450  rm->vlib_main = vm;
1451 
1454  vec_foreach (rt, rm->per_thread_data)
1455  {
1456  clib_spinlock_init (&rt->lock);
1457  pool_alloc (rt->pool, rm->max_reass_n);
1458  }
1459 
1460  node = vlib_get_node_by_name (vm, (u8 *) "ip4-full-reassembly-expire-walk");
1461  ASSERT (node);
1463 
1468 
1469  nbuckets = ip4_full_reass_get_nbuckets ();
1470  clib_bihash_init_16_8 (&rm->hash, "ip4-dr", nbuckets, nbuckets * 1024);
1471 
1472  node = vlib_get_node_by_name (vm, (u8 *) "ip4-drop");
1473  ASSERT (node);
1474  rm->ip4_drop_idx = node->index;
1475 
1476  rm->fq_index = vlib_frame_queue_main_init (ip4_full_reass_node.index, 0);
1477  rm->fq_feature_index =
1478  vlib_frame_queue_main_init (ip4_full_reass_node_feature.index, 0);
1479 
1480  rm->feature_use_refcount_per_intf = NULL;
1481  return error;
1482 }
1483 
1485 #endif /* CLIB_MARCH_VARIANT */
1486 
1487 static uword
1489  vlib_node_runtime_t * node, vlib_frame_t * f)
1490 {
1492  uword event_type, *event_data = 0;
1493 
1494  while (true)
1495  {
1497  (f64)
1499  (f64) MSEC_PER_SEC);
1500  event_type = vlib_process_get_events (vm, &event_data);
1501 
1502  switch (event_type)
1503  {
1504  case ~0: /* no events => timeout */
1505  /* nothing to do here */
1506  break;
1508  break;
1509  default:
1510  clib_warning ("BUG: event type 0x%wx", event_type);
1511  break;
1512  }
1513  f64 now = vlib_time_now (vm);
1514 
1515  ip4_full_reass_t *reass;
1516  int *pool_indexes_to_free = NULL;
1517 
1518  uword thread_index = 0;
1519  int index;
1520  const uword nthreads = vlib_num_workers () + 1;
1521  for (thread_index = 0; thread_index < nthreads; ++thread_index)
1522  {
1524  &rm->per_thread_data[thread_index];
1525  clib_spinlock_lock (&rt->lock);
1526 
1527  vec_reset_length (pool_indexes_to_free);
1528  /* *INDENT-OFF* */
1529  pool_foreach_index (index, rt->pool, ({
1530  reass = pool_elt_at_index (rt->pool, index);
1531  if (now > reass->last_heard + rm->timeout)
1532  {
1533  vec_add1 (pool_indexes_to_free, index);
1534  }
1535  }));
1536  /* *INDENT-ON* */
1537  int *i;
1538  /* *INDENT-OFF* */
1539  vec_foreach (i, pool_indexes_to_free)
1540  {
1541  ip4_full_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1542  ip4_full_reass_drop_all (vm, node, rm, reass);
1543  ip4_full_reass_free (rm, rt, reass);
1544  }
1545  /* *INDENT-ON* */
1546 
1547  clib_spinlock_unlock (&rt->lock);
1548  }
1549 
1550  vec_free (pool_indexes_to_free);
1551  if (event_data)
1552  {
1553  _vec_len (event_data) = 0;
1554  }
1555  }
1556 
1557  return 0;
1558 }
1559 
1560 /* *INDENT-OFF* */
1562  .function = ip4_full_reass_walk_expired,
1563  .type = VLIB_NODE_TYPE_PROCESS,
1564  .name = "ip4-full-reassembly-expire-walk",
1565  .format_trace = format_ip4_full_reass_trace,
1567  .error_strings = ip4_full_reass_error_strings,
1568 
1569 };
1570 /* *INDENT-ON* */
1571 
1572 static u8 *
1573 format_ip4_full_reass_key (u8 * s, va_list * args)
1574 {
1575  ip4_full_reass_key_t *key = va_arg (*args, ip4_full_reass_key_t *);
1576  s =
1577  format (s,
1578  "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1580  &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1581  return s;
1582 }
1583 
1584 static u8 *
1585 format_ip4_reass (u8 * s, va_list * args)
1586 {
1587  vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1588  ip4_full_reass_t *reass = va_arg (*args, ip4_full_reass_t *);
1589 
1590  s = format (s, "ID: %lu, key: %U\n first_bi: %u, data_len: %u, "
1591  "last_packet_octet: %u, trace_op_counter: %u\n",
1592  reass->id, format_ip4_full_reass_key, &reass->key,
1593  reass->first_bi, reass->data_len,
1594  reass->last_packet_octet, reass->trace_op_counter);
1595 
1596  u32 bi = reass->first_bi;
1597  u32 counter = 0;
1598  while (~0 != bi)
1599  {
1600  vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1601  vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1602  s =
1603  format (s,
1604  " #%03u: range: [%u, %u], bi: %u, off: %d, len: %u, "
1605  "fragment[%u, %u]\n", counter, vnb->ip.reass.range_first,
1606  vnb->ip.reass.range_last, bi,
1609  vnb->ip.reass.fragment_first, vnb->ip.reass.fragment_last);
1610  if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
1611  {
1612  bi = b->next_buffer;
1613  }
1614  else
1615  {
1616  bi = ~0;
1617  }
1618  }
1619  return s;
1620 }
1621 
1622 static clib_error_t *
1624  unformat_input_t * input,
1626 {
1628 
1629  vlib_cli_output (vm, "---------------------");
1630  vlib_cli_output (vm, "IP4 reassembly status");
1631  vlib_cli_output (vm, "---------------------");
1632  bool details = false;
1633  if (unformat (input, "details"))
1634  {
1635  details = true;
1636  }
1637 
1638  u32 sum_reass_n = 0;
1639  ip4_full_reass_t *reass;
1640  uword thread_index;
1641  const uword nthreads = vlib_num_workers () + 1;
1642  for (thread_index = 0; thread_index < nthreads; ++thread_index)
1643  {
1644  ip4_full_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1645  clib_spinlock_lock (&rt->lock);
1646  if (details)
1647  {
1648  /* *INDENT-OFF* */
1649  pool_foreach (reass, rt->pool, {
1650  vlib_cli_output (vm, "%U", format_ip4_reass, vm, reass);
1651  });
1652  /* *INDENT-ON* */
1653  }
1654  sum_reass_n += rt->reass_n;
1655  clib_spinlock_unlock (&rt->lock);
1656  }
1657  vlib_cli_output (vm, "---------------------");
1658  vlib_cli_output (vm, "Current full IP4 reassemblies count: %lu\n",
1659  (long unsigned) sum_reass_n);
1660  vlib_cli_output (vm,
1661  "Maximum configured concurrent full IP4 reassemblies per worker-thread: %lu\n",
1662  (long unsigned) rm->max_reass_n);
1663  vlib_cli_output (vm,
1664  "Maximum configured full IP4 reassembly timeout: %lums\n",
1665  (long unsigned) rm->timeout_ms);
1666  vlib_cli_output (vm,
1667  "Maximum configured full IP4 reassembly expire walk interval: %lums\n",
1668  (long unsigned) rm->expire_walk_interval_ms);
1669  return 0;
1670 }
1671 
1672 /* *INDENT-OFF* */
1674  .path = "show ip4-full-reassembly",
1675  .short_help = "show ip4-full-reassembly [details]",
1676  .function = show_ip4_reass,
1677 };
1678 /* *INDENT-ON* */
1679 
1680 #ifndef CLIB_MARCH_VARIANT
1683 {
1684  return vnet_feature_enable_disable ("ip4-unicast",
1685  "ip4-full-reassembly-feature",
1686  sw_if_index, enable_disable, 0, 0);
1687 }
1688 #endif /* CLIB_MARCH_VARIANT */
1689 
1690 
1691 #define foreach_ip4_full_reass_handoff_error \
1692 _(CONGESTION_DROP, "congestion drop")
1693 
1694 
1695 typedef enum
1696 {
1697 #define _(sym,str) IP4_FULL_REASS_HANDOFF_ERROR_##sym,
1699 #undef _
1702 
1704 #define _(sym,string) string,
1706 #undef _
1707 };
1708 
1709 typedef struct
1710 {
1713 
1714 static u8 *
1716 {
1717  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1718  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1720  va_arg (*args, ip4_full_reass_handoff_trace_t *);
1721 
1722  s =
1723  format (s, "ip4-full-reassembly-handoff: next-worker %d",
1724  t->next_worker_index);
1725 
1726  return s;
1727 }
1728 
1732  vlib_frame_t * frame, bool is_feature)
1733 {
1735 
1736  vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1737  u32 n_enq, n_left_from, *from;
1738  u16 thread_indices[VLIB_FRAME_SIZE], *ti;
1739  u32 fq_index;
1740 
1741  from = vlib_frame_vector_args (frame);
1742  n_left_from = frame->n_vectors;
1743  vlib_get_buffers (vm, from, bufs, n_left_from);
1744 
1745  b = bufs;
1746  ti = thread_indices;
1747 
1748  fq_index = (is_feature) ? rm->fq_feature_index : rm->fq_index;
1749 
1750  while (n_left_from > 0)
1751  {
1752  ti[0] = vnet_buffer (b[0])->ip.reass.owner_thread_index;
1753 
1754  if (PREDICT_FALSE
1755  ((node->flags & VLIB_NODE_FLAG_TRACE)
1756  && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
1757  {
1759  vlib_add_trace (vm, node, b[0], sizeof (*t));
1760  t->next_worker_index = ti[0];
1761  }
1762 
1763  n_left_from -= 1;
1764  ti += 1;
1765  b += 1;
1766  }
1767  n_enq =
1768  vlib_buffer_enqueue_to_thread (vm, fq_index, from, thread_indices,
1769  frame->n_vectors, 1);
1770 
1771  if (n_enq < frame->n_vectors)
1773  IP4_FULL_REASS_HANDOFF_ERROR_CONGESTION_DROP,
1774  frame->n_vectors - n_enq);
1775  return frame->n_vectors;
1776 }
1777 
1780  vlib_frame_t * frame)
1781 {
1782  return ip4_full_reass_handoff_node_inline (vm, node, frame,
1783  false /* is_feature */ );
1784 }
1785 
1786 
1787 /* *INDENT-OFF* */
1789  .name = "ip4-full-reassembly-handoff",
1790  .vector_size = sizeof (u32),
1791  .n_errors = ARRAY_LEN(ip4_full_reass_handoff_error_strings),
1792  .error_strings = ip4_full_reass_handoff_error_strings,
1793  .format_trace = format_ip4_full_reass_handoff_trace,
1794 
1795  .n_next_nodes = 1,
1796 
1797  .next_nodes = {
1798  [0] = "error-drop",
1799  },
1800 };
1801 /* *INDENT-ON* */
1802 
1803 
1804 /* *INDENT-OFF* */
1807  node,
1808  vlib_frame_t * frame)
1809 {
1810  return ip4_full_reass_handoff_node_inline (vm, node, frame,
1811  true /* is_feature */ );
1812 }
1813 /* *INDENT-ON* */
1814 
1815 
1816 /* *INDENT-OFF* */
1818  .name = "ip4-full-reass-feature-hoff",
1819  .vector_size = sizeof (u32),
1820  .n_errors = ARRAY_LEN(ip4_full_reass_handoff_error_strings),
1821  .error_strings = ip4_full_reass_handoff_error_strings,
1822  .format_trace = format_ip4_full_reass_handoff_trace,
1823 
1824  .n_next_nodes = 1,
1825 
1826  .next_nodes = {
1827  [0] = "error-drop",
1828  },
1829 };
1830 /* *INDENT-ON* */
1831 
1832 #ifndef CLIB_MARCH_VARIANT
1833 int
1835 {
1837  vec_validate (rm->feature_use_refcount_per_intf, sw_if_index);
1838  if (is_enable)
1839  {
1840  if (!rm->feature_use_refcount_per_intf[sw_if_index])
1841  {
1843  return vnet_feature_enable_disable ("ip4-unicast",
1844  "ip4-full-reassembly-feature",
1845  sw_if_index, 1, 0, 0);
1846  }
1848  }
1849  else
1850  {
1852  if (!rm->feature_use_refcount_per_intf[sw_if_index])
1853  return vnet_feature_enable_disable ("ip4-unicast",
1854  "ip4-full-reassembly-feature",
1855  sw_if_index, 0, 0, 0);
1856  }
1857  return -1;
1858 }
1859 #endif
1860 
1861 /*
1862  * fd.io coding-style-patch-verification: ON
1863  *
1864  * Local Variables:
1865  * eval: (c-set-style "gnu")
1866  * End:
1867  */
#define vec_validate(V, I)
Make sure vector is long enough for given index (no header, unspecified alignment) ...
Definition: vec.h:509
u32 flags
buffer flags: VLIB_BUFFER_FREE_LIST_INDEX_MASK: bits used to store free list index, VLIB_BUFFER_IS_TRACED: trace this buffer.
Definition: buffer.h:124
vnet_api_error_t
Definition: api_errno.h:162
clib_bihash_16_8_t hash
static vlib_cli_command_t trace
(constructor) VLIB_CLI_COMMAND (trace)
Definition: vlib_api_cli.c:899
static u16 ip4_full_reass_buffer_get_data_len(vlib_buffer_t *b)
#define clib_min(x, y)
Definition: clib.h:327
static_always_inline void clib_spinlock_unlock(clib_spinlock_t *p)
Definition: lock.h:119
static_always_inline void clib_spinlock_lock(clib_spinlock_t *p)
Definition: lock.h:80
ip4_full_reass_key_t key
#define CLIB_UNUSED(x)
Definition: clib.h:87
vnet_api_error_t ip4_full_reass_enable_disable(u32 sw_if_index, u8 enable_disable)
ip4_full_reass_next_t
static f64 vlib_process_wait_for_event_or_clock(vlib_main_t *vm, f64 dt)
Suspend a cooperative multi-tasking thread Waits for an event, or for the indicated number of seconds...
Definition: node_funcs.h:751
ip4_full_reass_rc_t
static void vlib_buffer_free(vlib_main_t *vm, u32 *buffers, u32 n_buffers)
Free buffers Frees the entire buffer chain for each buffer.
Definition: buffer_funcs.h:937
ip4_address_t src_address
Definition: ip4_packet.h:125
ip4_full_reass_trace_operation_e
#define pool_alloc(P, N)
Allocate N more free elements to pool (unspecified alignment).
Definition: pool.h:361
format_function_t format_ip4_header
Definition: format.h:81
u64 as_u64
Definition: bihash_doc.h:63
static void ip4_full_reass_set_params(u32 timeout_ms, u32 max_reassemblies, u32 max_reassembly_length, u32 expire_walk_interval_ms)
unsigned long u64
Definition: types.h:89
#define clib_memcpy_fast(a, b, c)
Definition: string.h:81
static char * ip4_full_reass_error_strings[]
clib_memset(h->entries, 0, sizeof(h->entries[0]) *entries)
u32 index
Definition: node.h:279
static f64 vlib_time_now(vlib_main_t *vm)
Definition: main.h:333
ip4_full_reass_handoff_error_t
u32 vlib_frame_queue_main_init(u32 node_index, u32 frame_queue_nelts)
Definition: threads.c:1873
static u8 * format_ip4_full_reass_key(u8 *s, va_list *args)
u32 thread_index
Definition: main.h:249
u16 current_length
Nbytes between current data and the end of this buffer.
Definition: buffer.h:113
#define vec_add1(V, E)
Add 1 element to end of vector (unspecified alignment).
Definition: vec.h:592
static clib_error_t * show_ip4_reass(vlib_main_t *vm, unformat_input_t *input, CLIB_UNUSED(vlib_cli_command_t *lmd))
ip4_full_reass_val_t v
IPv4 Reassembly.
#define MSEC_PER_SEC
static void ip4_full_reass_init(ip4_full_reass_t *reass)
static u32 format_get_indent(u8 *s)
Definition: format.h:72
vlib_main_t * vm
Definition: in2out_ed.c:1582
static ip4_full_reass_rc_t ip4_full_reass_update(vlib_main_t *vm, vlib_node_runtime_t *node, ip4_full_reass_main_t *rm, ip4_full_reass_per_thread_t *rt, ip4_full_reass_t *reass, u32 *bi0, u32 *next0, u32 *error0, bool is_custom_app, u32 *handoff_thread_idx)
u32 * fib_index_by_sw_if_index
Table index indexed by software interface.
Definition: ip4.h:122
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:424
u16 flags_and_fragment_offset
Definition: ip4_packet.h:106
#define VLIB_NODE_FN(node)
Definition: node.h:202
#define IP4_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT
vlib_error_t * errors
Vector of errors for this node.
Definition: node.h:469
static uword vlib_buffer_length_in_chain(vlib_main_t *vm, vlib_buffer_t *b)
Get length in bytes of the buffer chain.
Definition: buffer_funcs.h:402
#define pool_get(P, E)
Allocate an object E from a pool P (unspecified alignment).
Definition: pool.h:252
unsigned char u8
Definition: types.h:56
#define vec_pop(V)
Returns last element of a vector and decrements its length.
Definition: vec.h:685
static int ip4_get_fragment_offset_bytes(const ip4_header_t *i)
Definition: ip4_packet.h:184
vlib_node_registration_t ip4_full_reass_handoff_node
(constructor) VLIB_REGISTER_NODE (ip4_full_reass_handoff_node)
#define vec_reset_length(v)
Reset vector length to zero NULL-pointer tolerant.
double f64
Definition: types.h:142
#define clib_memcpy(d, s, n)
Definition: string.h:180
vlib_main_t * vlib_main
format_function_t format_ip4_address
Definition: format.h:73
#define IP4_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS
#define pool_foreach(VAR, POOL, BODY)
Iterate through pool.
Definition: pool.h:513
#define VLIB_INIT_FUNCTION(x)
Definition: init.h:173
static uword vlib_process_get_events(vlib_main_t *vm, uword **data_vector)
Return the first event type which has occurred and a vector of per-event data of that type...
Definition: node_funcs.h:579
static u16 ip4_get_fragment_more(const ip4_header_t *i)
Definition: ip4_packet.h:161
ip4_address_t dst_address
Definition: ip4_packet.h:125
u8 * format_white_space(u8 *s, va_list *va)
Definition: std-formats.c:129
#define foreach_ip4_full_reass_handoff_error
static ip4_full_reass_rc_t ip4_full_reass_insert_range_in_chain(vlib_main_t *vm, ip4_full_reass_main_t *rm, ip4_full_reass_per_thread_t *rt, ip4_full_reass_t *reass, u32 prev_range_bi, u32 new_next_bi)
static uword ip4_full_reass_walk_expired(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *f)
clib_bihash_16_8_t * new_hash
static void ip4_full_reass_free(ip4_full_reass_main_t *rm, ip4_full_reass_per_thread_t *rt, ip4_full_reass_t *reass)
unsigned int u32
Definition: types.h:88
vlib_node_registration_t ip4_full_reass_node_feature
(constructor) VLIB_REGISTER_NODE (ip4_full_reass_node_feature)
#define VLIB_FRAME_SIZE
Definition: node.h:377
static uword ip4_full_reass_inline(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame, bool is_feature, bool is_custom_app)
static void clib_spinlock_init(clib_spinlock_t *p)
Definition: lock.h:63
vlib_error_t error
Error code for buffers to be enqueued to error handler.
Definition: buffer.h:136
vlib_node_registration_t ip4_full_reass_node
(constructor) VLIB_REGISTER_NODE (ip4_full_reass_node)
static u32 vlib_buffer_chain_linearize(vlib_main_t *vm, vlib_buffer_t *b)
u32 fq_index
Worker handoff.
#define pool_elt_at_index(p, i)
Returns pointer to element at given index.
Definition: pool.h:534
vlib_node_t * vlib_get_node_by_name(vlib_main_t *vm, u8 *name)
Definition: node.c:45
static u32 ip4_full_reass_get_nbuckets()
static void vlib_process_signal_event(vlib_main_t *vm, uword node_index, uword type_opaque, uword data)
Definition: node_funcs.h:1015
long ctx[MAX_CONNS]
Definition: main.c:144
struct _unformat_input_t unformat_input_t
unsigned short u16
Definition: types.h:57
u8 data_len
Definition: ikev2_types.api:24
static void * vlib_buffer_get_current(vlib_buffer_t *b)
Get pointer to current data to process.
Definition: buffer.h:229
#define pool_put(P, E)
Free an object E in pool P.
Definition: pool.h:302
static void ip4_full_reass_free_ctx(ip4_full_reass_per_thread_t *rt, ip4_full_reass_t *reass)
#define PREDICT_FALSE(x)
Definition: clib.h:120
ip4_full_reass_per_thread_t * per_thread_data
#define always_inline
Definition: ipsec.h:28
static void ip4_full_reass_add_trace(vlib_main_t *vm, vlib_node_runtime_t *node, ip4_full_reass_main_t *rm, ip4_full_reass_t *reass, u32 bi, ip4_full_reass_trace_operation_e action, u32 size_diff, u32 thread_id_to)
clib_bihash_kv_16_8_t kv
u32 node_index
Node index.
Definition: node.h:487
#define vlib_validate_buffer_enqueue_x1(vm, node, next_index, to_next, n_left_to_next, bi0, next0)
Finish enqueueing one buffer forward in the graph.
Definition: buffer_node.h:224
#define vlib_get_next_frame(vm, node, next_index, vectors, n_vectors_left)
Get pointer to next frame vector data by (vlib_node_runtime_t, next_index).
Definition: node_funcs.h:391
ip4_full_reass_event_t
static void vlib_node_increment_counter(vlib_main_t *vm, u32 node_index, u32 counter_index, u64 increment)
Definition: node_funcs.h:1231
ip4_full_reass_main_t ip4_full_reass_main
static ip4_full_reass_t * ip4_full_reass_find_or_create(vlib_main_t *vm, vlib_node_runtime_t *node, ip4_full_reass_main_t *rm, ip4_full_reass_per_thread_t *rt, ip4_full_reass_kv_t *kv, u8 *do_handoff)
#define foreach_ip4_error
Definition: ip4_error.h:43
static int ip4_rehash_cb(clib_bihash_kv_16_8_t *kv, void *_ctx)
#define VLIB_REGISTER_NODE(x,...)
Definition: node.h:169
static u8 * format_ip4_reass(u8 *s, va_list *args)
u16 n_vectors
Definition: node.h:396
sll srl srl sll sra u16x4 i
Definition: vector_sse42.h:317
static u16 ip4_get_fragment_offset(const ip4_header_t *i)
Definition: ip4_packet.h:155
#define vec_free(V)
Free vector&#39;s memory (no header).
Definition: vec.h:380
static_always_inline void vnet_feature_next(u32 *next0, vlib_buffer_t *b0)
Definition: feature.h:322
#define clib_warning(format, args...)
Definition: error.h:59
vnet_api_error_t ip4_full_reass_get(u32 *timeout_ms, u32 *max_reassemblies, u32 *max_reassembly_length, u32 *expire_walk_interval_ms)
get ip4 reassembly configuration
vlib_node_registration_t ip4_full_reass_expire_node
(constructor) VLIB_REGISTER_NODE (ip4_full_reass_expire_node)
static u32 vlib_buffer_get_trace_thread(vlib_buffer_t *b)
Extract the thread id from a trace handle.
Definition: buffer.h:376
u8 * format_hexdump(u8 *s, va_list *va)
Definition: std-formats.c:297
static u8 * format_ip4_full_reass_trace(u8 *s, va_list *args)
#define ARRAY_LEN(x)
Definition: clib.h:67
void vlib_put_next_frame(vlib_main_t *vm, vlib_node_runtime_t *r, u32 next_index, u32 n_vectors_left)
Release pointer to next frame vector data.
Definition: main.c:483
static void ip4_full_reass_drop_all(vlib_main_t *vm, vlib_node_runtime_t *node, ip4_full_reass_main_t *rm, ip4_full_reass_t *reass)
static vlib_cli_command_t show_ip4_full_reass_cmd
(constructor) VLIB_CLI_COMMAND (show_ip4_full_reass_cmd)
static ip4_full_reass_rc_t ip4_full_reass_remove_range_from_chain(vlib_main_t *vm, vlib_node_runtime_t *node, ip4_full_reass_main_t *rm, ip4_full_reass_t *reass, u32 prev_range_bi, u32 discard_bi)
vlib_main_t vlib_node_runtime_t * node
Definition: in2out_ed.c:1582
#define VLIB_CLI_COMMAND(x,...)
Definition: cli.h:158
signed int i32
Definition: types.h:77
static ip4_full_reass_rc_t ip4_full_reass_finalize(vlib_main_t *vm, vlib_node_runtime_t *node, ip4_full_reass_main_t *rm, ip4_full_reass_per_thread_t *rt, ip4_full_reass_t *reass, u32 *bi0, u32 *next0, u32 *error0, bool is_custom_app)
u16 cached_next_index
Next frame index that vector arguments were last enqueued to last time this node ran.
Definition: node.h:510
static char * ip4_full_reass_handoff_error_strings[]
ip4_full_reass_key_t k
#define ASSERT(truth)
void vlib_cli_output(vlib_main_t *vm, char *fmt,...)
Definition: cli.c:696
vnet_api_error_t ip4_full_reass_set(u32 timeout_ms, u32 max_reassemblies, u32 max_reassembly_length, u32 expire_walk_interval_ms)
set ip4 reassembly configuration
static uword ip4_full_reass_handoff_node_inline(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame, bool is_feature)
static void vlib_buffer_advance(vlib_buffer_t *b, word l)
Advance current data pointer by the supplied (signed!) amount.
Definition: buffer.h:248
VNET_FEATURE_INIT(ip4_full_reass_feature, static)
ip4_full_reass_trace_operation_e action
#define VNET_FEATURES(...)
Definition: feature.h:470
#define vec_elt(v, i)
Get vector value at index i.
void clib_bihash_copied(void *dst, void *src)
typedef key
Definition: ipsec_types.api:85
struct _vlib_node_registration vlib_node_registration_t
static void ip4_full_reass_trace_details(vlib_main_t *vm, u32 bi, ip4_full_reass_range_trace_t *trace)
struct vnet_buffer_opaque_t::@162::@164 ip
vl_api_address_t ip
Definition: l2.api:501
static u8 * format_ip4_full_reass_range_trace(u8 *s, va_list *args)
vl_api_mac_event_action_t action
Definition: l2.api:181
#define vec_len(v)
Number of elements in vector (rvalue-only, NULL tolerant)
u32 next_buffer
Next buffer for this linked-list of buffers.
Definition: buffer.h:140
vlib_main_t vlib_node_runtime_t vlib_frame_t * frame
Definition: in2out_ed.c:1583
VLIB buffer representation.
Definition: buffer.h:102
u64 uword
Definition: types.h:112
static void * vlib_frame_vector_args(vlib_frame_t *f)
Get pointer to frame vector data.
Definition: node_funcs.h:297
u32 index
Definition: flow_types.api:221
ip4_full_reass_range_trace_t trace_range
static_always_inline u32 vlib_buffer_enqueue_to_thread(vlib_main_t *vm, u32 frame_queue_index, u32 *buffer_indices, u16 *thread_indices, u32 n_packets, int drop_on_congestion)
Definition: buffer_node.h:494
int ip4_full_reass_enable_disable_with_refcnt(u32 sw_if_index, int is_enable)
#define vnet_buffer(b)
Definition: buffer.h:417
static u32 ip4_full_reass_buffer_get_data_offset(vlib_buffer_t *b)
ip4_main_t ip4_main
Global ip4 main structure.
Definition: ip4_forward.c:1144
static u32 vlib_num_workers()
Definition: threads.h:377
static u8 * format_ip4_full_reass_handoff_trace(u8 *s, va_list *args)
static clib_error_t * ip4_full_reass_init_function(vlib_main_t *vm)
#define vec_foreach(var, vec)
Vector iterator.
u16 flags
Copy of main node flags.
Definition: node.h:500
void * vlib_add_trace(vlib_main_t *vm, vlib_node_runtime_t *r, vlib_buffer_t *b, u32 n_data_bytes)
Definition: trace.c:577
#define IP4_REASS_MAX_REASSEMBLIES_DEFAULT
static void vlib_buffer_free_one(vlib_main_t *vm, u32 buffer_index)
Free one buffer Shorthand to free a single buffer chain.
Definition: buffer_funcs.h:970
static int ip4_header_bytes(const ip4_header_t *i)
Definition: ip4_packet.h:190
#define pool_foreach_index(i, v, body)
Iterate pool by index.
Definition: pool.h:558
static_always_inline void vlib_get_buffers(vlib_main_t *vm, u32 *bi, vlib_buffer_t **b, int count)
Translate array of buffer indices into buffer pointers.
Definition: buffer_funcs.h:280
#define VLIB_NODE_FLAG_TRACE
Definition: node.h:301
u32 total_length_not_including_first_buffer
Only valid for first buffer in chain.
Definition: buffer.h:167
#define IP4_REASS_HT_LOAD_FACTOR
static vlib_buffer_t * vlib_get_buffer(vlib_main_t *vm, u32 buffer_index)
Translate buffer index into buffer pointer.
Definition: buffer_funcs.h:85
static u16 ip4_header_checksum(ip4_header_t *i)
Definition: ip4_packet.h:314
vl_api_interface_index_t sw_if_index
Definition: wireguard.api:33
uword unformat(unformat_input_t *i, const char *fmt,...)
Definition: unformat.c:978
Definition: defs.h:46
vlib_node_registration_t ip4_full_reass_feature_handoff_node
(constructor) VLIB_REGISTER_NODE (ip4_full_reass_feature_handoff_node)
int vnet_feature_enable_disable(const char *arc_name, const char *node_name, u32 sw_if_index, int enable_disable, void *feature_config, u32 n_feature_config_bytes)
Definition: feature.c:303
CLIB vectors are ubiquitous dynamically resized arrays with by user defined "headers".
#define IP4_REASS_TIMEOUT_DEFAULT_MS
#define IP4_REASS_DEBUG_BUFFER(...)