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Vector Packet Processing
adj_nbr.c
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1 /*
2  * Copyright (c) 2016 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 #include <vnet/adj/adj_nbr.h>
17 #include <vnet/adj/adj_internal.h>
19 #include <vnet/fib/fib_walk.h>
20 
21 /*
22  * Vector Hash tables of neighbour (traditional) adjacencies
23  * Key: interface(for the vector index), address (and its proto),
24  * link-type/ether-type.
25  */
26 static BVT(clib_bihash) **adj_nbr_tables[FIB_PROTOCOL_MAX];
27 
28 // FIXME SIZE APPROPRIATELY. ASK DAVEB.
29 #define ADJ_NBR_DEFAULT_HASH_NUM_BUCKETS (64 * 64)
30 #define ADJ_NBR_DEFAULT_HASH_MEMORY_SIZE (32<<20)
31 
32 
33 #define ADJ_NBR_SET_KEY(_key, _lt, _nh) \
34 { \
35  _key.key[0] = (_nh)->as_u64[0]; \
36  _key.key[1] = (_nh)->as_u64[1]; \
37  _key.key[2] = (_lt); \
38 }
39 
40 #define ADJ_NBR_ITF_OK(_proto, _itf) \
41  (((_itf) < vec_len(adj_nbr_tables[_proto])) && \
42  (NULL != adj_nbr_tables[_proto][sw_if_index]))
43 
44 static void
45 adj_nbr_insert (fib_protocol_t nh_proto,
46  vnet_link_t link_type,
47  const ip46_address_t *nh_addr,
48  u32 sw_if_index,
49  adj_index_t adj_index)
50 {
51  BVT(clib_bihash_kv) kv;
52 
53  if (sw_if_index >= vec_len(adj_nbr_tables[nh_proto]))
54  {
55  vec_validate(adj_nbr_tables[nh_proto], sw_if_index);
56  }
57  if (NULL == adj_nbr_tables[nh_proto][sw_if_index])
58  {
59  adj_nbr_tables[nh_proto][sw_if_index] =
60  clib_mem_alloc_aligned(sizeof(BVT(clib_bihash)),
62  memset(adj_nbr_tables[nh_proto][sw_if_index],
63  0,
64  sizeof(BVT(clib_bihash)));
65 
66  BV(clib_bihash_init) (adj_nbr_tables[nh_proto][sw_if_index],
67  "Adjacency Neighbour table",
70  }
71 
72  ADJ_NBR_SET_KEY(kv, link_type, nh_addr);
73  kv.value = adj_index;
74 
75  BV(clib_bihash_add_del) (adj_nbr_tables[nh_proto][sw_if_index], &kv, 1);
76 }
77 
78 void
80  fib_protocol_t nh_proto,
81  vnet_link_t link_type,
82  const ip46_address_t *nh_addr,
83  u32 sw_if_index)
84 {
85  BVT(clib_bihash_kv) kv;
86 
87  if (!ADJ_NBR_ITF_OK(nh_proto, sw_if_index))
88  return;
89 
90  ADJ_NBR_SET_KEY(kv, link_type, nh_addr);
91  kv.value = ai;
92 
93  BV(clib_bihash_add_del) (adj_nbr_tables[nh_proto][sw_if_index], &kv, 0);
94 }
95 
96 static adj_index_t
98  vnet_link_t link_type,
99  const ip46_address_t *nh_addr,
100  u32 sw_if_index)
101 {
102  BVT(clib_bihash_kv) kv;
103 
104  ADJ_NBR_SET_KEY(kv, link_type, nh_addr);
105 
106  if (!ADJ_NBR_ITF_OK(nh_proto, sw_if_index))
107  return (ADJ_INDEX_INVALID);
108 
109  if (BV(clib_bihash_search)(adj_nbr_tables[nh_proto][sw_if_index],
110  &kv, &kv) < 0)
111  {
112  return (ADJ_INDEX_INVALID);
113  }
114  else
115  {
116  return (kv.value);
117  }
118 }
119 
120 static inline u32
122 {
123  switch (proto) {
124  case FIB_PROTOCOL_IP4:
125  return (ip4_arp_node.index);
126  case FIB_PROTOCOL_IP6:
127  return (ip6_discover_neighbor_node.index);
128  case FIB_PROTOCOL_MPLS:
129  break;
130  }
131  ASSERT(0);
132  return (ip4_arp_node.index);
133 }
134 
135 /**
136  * @brief Check and set feature flags if o/p interface has any o/p features.
137  */
138 static void
140 {
141  ip_adjacency_t *adj;
143  i16 feature_count;
144  u8 arc_index;
145  u32 sw_if_index;
146 
147  adj = adj_get(ai);
148 
149  switch (adj->ia_link)
150  {
151  case VNET_LINK_IP4:
153  break;
154  case VNET_LINK_IP6:
156  break;
157  case VNET_LINK_MPLS:
159  break;
160  default:
161  return;
162  }
163 
164  sw_if_index = adj->rewrite_header.sw_if_index;
165  if (vec_len(fm->feature_count_by_sw_if_index[arc_index]) > sw_if_index)
166  {
167  feature_count = fm->feature_count_by_sw_if_index[arc_index][sw_if_index];
168  if (feature_count > 0)
169  adj->rewrite_header.flags |= VNET_REWRITE_HAS_FEATURES;
170  }
171 
172  return;
173 }
174 
175 static ip_adjacency_t*
177  vnet_link_t link_type,
178  const ip46_address_t *nh_addr,
179  u32 sw_if_index)
180 {
181  ip_adjacency_t *adj;
182 
183  adj = adj_alloc(nh_proto);
184 
185  adj_nbr_insert(nh_proto, link_type, nh_addr,
186  sw_if_index,
187  adj_get_index(adj));
188 
189  /*
190  * since we just added the ADJ we have no rewrite string for it,
191  * so its for ARP
192  */
194  adj->sub_type.nbr.next_hop = *nh_addr;
195  adj->ia_link = link_type;
196  adj->ia_nh_proto = nh_proto;
197  adj->rewrite_header.sw_if_index = sw_if_index;
198 
200  return (adj);
201 }
202 
203 /*
204  * adj_nbr_add_or_lock
205  *
206  * Add an adjacency for the neighbour requested.
207  *
208  * The key for an adj is:
209  * - the Next-hops protocol (i.e. v4 or v6)
210  * - the address of the next-hop
211  * - the interface the next-hop is reachable through
212  */
215  vnet_link_t link_type,
216  const ip46_address_t *nh_addr,
217  u32 sw_if_index)
218 {
219  adj_index_t adj_index;
220  ip_adjacency_t *adj;
221 
222  adj_index = adj_nbr_find(nh_proto, link_type, nh_addr, sw_if_index);
223 
224  if (ADJ_INDEX_INVALID == adj_index)
225  {
226  vnet_main_t *vnm;
227 
228  vnm = vnet_get_main();
229  adj = adj_nbr_alloc(nh_proto, link_type, nh_addr, sw_if_index);
230  adj_index = adj_get_index(adj);
231  adj_lock(adj_index);
232 
233  vnet_rewrite_init(vnm, sw_if_index,
234  adj_get_nd_node(nh_proto),
235  vnet_tx_node_index_for_sw_interface(vnm, sw_if_index),
236  &adj->rewrite_header);
237 
238  /*
239  * we need a rewrite where the destination IP address is converted
240  * to the appropriate link-layer address. This is interface specific.
241  * So ask the interface to do it.
242  */
243  vnet_update_adjacency_for_sw_interface(vnm, sw_if_index, adj_index);
244  }
245  else
246  {
247  adj_lock(adj_index);
248  }
249 
250  return (adj_index);
251 }
252 
255  vnet_link_t link_type,
256  const ip46_address_t *nh_addr,
257  u32 sw_if_index,
258  u8 *rewrite)
259 {
260  adj_index_t adj_index;
261  ip_adjacency_t *adj;
262 
263  adj_index = adj_nbr_find(nh_proto, link_type, nh_addr, sw_if_index);
264 
265  if (ADJ_INDEX_INVALID == adj_index)
266  {
267  adj = adj_nbr_alloc(nh_proto, link_type, nh_addr, sw_if_index);
268  adj->rewrite_header.sw_if_index = sw_if_index;
269  }
270  else
271  {
272  adj = adj_get(adj_index);
273  }
274 
275  adj_lock(adj_get_index(adj));
278  rewrite);
279 
280  return (adj_get_index(adj));
281 }
282 
283 /**
284  * adj_nbr_update_rewrite
285  *
286  * Update the adjacency's rewrite string. A NULL string implies the
287  * rewirte is reset (i.e. when ARP/ND etnry is gone).
288  * NB: the adj being updated may be handling traffic in the DP.
289  */
290 void
293  u8 *rewrite)
294 {
295  ip_adjacency_t *adj;
296 
297  ASSERT(ADJ_INDEX_INVALID != adj_index);
298 
299  adj = adj_get(adj_index);
300 
301  if (flags & ADJ_NBR_REWRITE_FLAG_COMPLETE)
302  {
303  /*
304  * update the adj's rewrite string and build the arc
305  * from the rewrite node to the interface's TX node
306  */
310  vnet_get_main(),
311  adj->rewrite_header.sw_if_index),
312  rewrite);
313  }
314  else
315  {
319  vnet_get_main(),
320  adj->rewrite_header.sw_if_index),
321  rewrite);
322  }
323 }
324 
325 /**
326  * adj_nbr_update_rewrite_internal
327  *
328  * Update the adjacency's rewrite string. A NULL string implies the
329  * rewirte is reset (i.e. when ARP/ND etnry is gone).
330  * NB: the adj being updated may be handling traffic in the DP.
331  */
332 void
334  ip_lookup_next_t adj_next_index,
335  u32 this_node,
336  u32 next_node,
337  u8 *rewrite)
338 {
339  ip_adjacency_t *walk_adj;
340  adj_index_t walk_ai;
341  vlib_main_t * vm;
342  u32 old_next;
343  int do_walk;
344 
345  vm = vlib_get_main();
346  old_next = adj->lookup_next_index;
347 
348  walk_ai = adj_get_index(adj);
349  if (VNET_LINK_MPLS == adj->ia_link)
350  {
351  /*
352  * The link type MPLS has no children in the control plane graph, it only
353  * has children in the data-palne graph. The backwalk is up the former.
354  * So we need to walk from its IP cousin.
355  */
356  walk_ai = adj_nbr_find(adj->ia_nh_proto,
358  &adj->sub_type.nbr.next_hop,
359  adj->rewrite_header.sw_if_index);
360  }
361 
362  /*
363  * Don't call the walk re-entrantly
364  */
365  if (ADJ_INDEX_INVALID != walk_ai)
366  {
367  walk_adj = adj_get(walk_ai);
368  if (ADJ_FLAG_SYNC_WALK_ACTIVE & walk_adj->ia_flags)
369  {
370  do_walk = 0;
371  }
372  else
373  {
374  /*
375  * Prevent re-entrant walk of the same adj
376  */
377  walk_adj->ia_flags |= ADJ_FLAG_SYNC_WALK_ACTIVE;
378  do_walk = 1;
379  }
380  }
381  else
382  {
383  do_walk = 0;
384  }
385 
386  /*
387  * lock the adjacencies that are affected by updates this walk will provoke.
388  * Since the aim of the walk is to update children to link to a different
389  * DPO, this adj will no longer be in use and its lock count will drop to 0.
390  * We don't want it to be deleted as part of this endevour.
391  */
392  adj_lock(adj_get_index(adj));
393  adj_lock(walk_ai);
394 
395  /*
396  * Updating a rewrite string is not atomic;
397  * - the rewrite string is too long to write in one instruction
398  * - when swapping from incomplete to complete, we also need to update
399  * the VLIB graph next-index of the adj.
400  * ideally we would only want to suspend forwarding via this adj whilst we
401  * do this, but we do not have that level of granularity - it's suspend all
402  * worker threads or nothing.
403  * The other chioces are:
404  * - to mark the adj down and back walk so child load-balances drop this adj
405  * from the set.
406  * - update the next_node index of this adj to point to error-drop
407  * both of which will mean for MAC change we will drop for this adj
408  * which is not acceptable. However, when the adj changes type (from
409  * complete to incomplete and vice-versa) the child DPOs, which have the
410  * VLIB graph next node index, will be sending packets to the wrong graph
411  * node. So from the options above, updating the next_node of the adj to
412  * be drop will work, but it relies on each graph node v4/v6/mpls, rewrite/
413  * arp/midchain always be valid w.r.t. a mis-match of adj type and node type
414  * (i.e. a rewrite adj in the arp node). This is not enforcable. Getting it
415  * wrong will lead to hard to find bugs since its a race condition. So we
416  * choose the more reliable method of updating the children to use the drop,
417  * then switching adj's type, then updating the children again. Did I mention
418  * that this doesn't happen often...
419  * So we need to distinguish between the two cases:
420  * 1 - mac change
421  * 2 - adj type change
422  */
423  if (do_walk &&
424  old_next != adj_next_index &&
425  ADJ_INDEX_INVALID != walk_ai)
426  {
427  /*
428  * the adj is changing type. we need to fix all children so that they
429  * stack momentarily on a drop, while the adj changes. If we don't do
430  * this the children will send packets to a VLIB graph node that does
431  * not correspond to the adj's type - and it goes downhill from there.
432  */
433  fib_node_back_walk_ctx_t bw_ctx = {
435  /*
436  * force this walk to be synchrous. if we don't and a node in the graph
437  * (a heavily shared path-list) chooses to back-ground the walk (make it
438  * async) then it will pause and we will do the adj update below, before
439  * all the children are updated. not good.
440  */
441  .fnbw_flags = FIB_NODE_BW_FLAG_FORCE_SYNC,
442  };
443 
444  fib_walk_sync(FIB_NODE_TYPE_ADJ, walk_ai, &bw_ctx);
445  }
446 
447  /*
448  * If we are just updating the MAC string of the adj (which we also can't
449  * do atomically), then we need to stop packets switching through the adj.
450  * We can't do that on a per-adj basis, so it's all the packets.
451  * If we are updating the type, and we walked back to the children above,
452  * then this barrier serves to flush the queues/frames.
453  */
455 
456  adj->lookup_next_index = adj_next_index;
457 
458  if (NULL != rewrite)
459  {
460  /*
461  * new rewrite provided.
462  * fill in the adj's rewrite string, and build the VLIB graph arc.
463  */
464  vnet_rewrite_set_data_internal(&adj->rewrite_header,
465  sizeof(adj->rewrite_data),
466  rewrite,
467  vec_len(rewrite));
468  vec_free(rewrite);
469  }
470  else
471  {
472  vnet_rewrite_clear_data_internal(&adj->rewrite_header,
473  sizeof(adj->rewrite_data));
474  }
475  adj->rewrite_header.next_index = vlib_node_add_next(vlib_get_main(),
476  this_node,
477  next_node);
478 
479  /*
480  * done with the rewirte update - let the workers loose.
481  */
483 
484  if (do_walk &&
485  (old_next != adj->lookup_next_index) &&
486  (ADJ_INDEX_INVALID != walk_ai))
487  {
488  /*
489  * backwalk to the children so they can stack on the now updated
490  * adjacency
491  */
492  fib_node_back_walk_ctx_t bw_ctx = {
494  };
495 
496  fib_walk_sync(FIB_NODE_TYPE_ADJ, walk_ai, &bw_ctx);
497  }
498  /*
499  * Prevent re-entrant walk of the same adj
500  */
501  if (do_walk)
502  {
503  walk_adj->ia_flags &= ~ADJ_FLAG_SYNC_WALK_ACTIVE;
504  }
505 
507  adj_unlock(walk_ai);
508 }
509 
510 typedef struct adj_db_count_ctx_t_ {
513 
514 static void
515 adj_db_count (BVT(clib_bihash_kv) * kvp,
516  void *arg)
517 {
518  adj_db_count_ctx_t * ctx = arg;
519  ctx->count++;
520 }
521 
522 u32
524 {
526  .count = 0,
527  };
528  fib_protocol_t proto;
529  u32 sw_if_index = 0;
530 
531  for (proto = FIB_PROTOCOL_IP4; proto <= FIB_PROTOCOL_IP6; proto++)
532  {
533  vec_foreach_index(sw_if_index, adj_nbr_tables[proto])
534  {
535  if (NULL != adj_nbr_tables[proto][sw_if_index])
536  {
538  adj_nbr_tables[proto][sw_if_index],
539  adj_db_count,
540  &ctx);
541  }
542  }
543  }
544  return (ctx.count);
545 }
546 
547 /**
548  * @brief Context for a walk of the adjacency neighbour DB
549  */
550 typedef struct adj_walk_ctx_t_
551 {
553  void *awc_ctx;
555 
556 static void
557 adj_nbr_walk_cb (BVT(clib_bihash_kv) * kvp,
558  void *arg)
559 {
560  adj_walk_ctx_t *ctx = arg;
561 
562  // FIXME: can't stop early...
563  ctx->awc_cb(kvp->value, ctx->awc_ctx);
564 }
565 
566 void
567 adj_nbr_walk (u32 sw_if_index,
568  fib_protocol_t adj_nh_proto,
569  adj_walk_cb_t cb,
570  void *ctx)
571 {
572  if (!ADJ_NBR_ITF_OK(adj_nh_proto, sw_if_index))
573  return;
574 
575  adj_walk_ctx_t awc = {
576  .awc_ctx = ctx,
577  .awc_cb = cb,
578  };
579 
581  adj_nbr_tables[adj_nh_proto][sw_if_index],
583  &awc);
584 }
585 
586 /**
587  * @brief Context for a walk of the adjacency neighbour DB
588  */
589 typedef struct adj_walk_nh_ctx_t_
590 {
592  void *awc_ctx;
593  const ip46_address_t *awc_nh;
595 
596 static void
597 adj_nbr_walk_nh_cb (BVT(clib_bihash_kv) * kvp,
598  void *arg)
599 {
600  ip_adjacency_t *adj;
601  adj_walk_nh_ctx_t *ctx = arg;
602 
603  adj = adj_get(kvp->value);
604 
605  if (!ip46_address_cmp(&adj->sub_type.nbr.next_hop, ctx->awc_nh))
606  ctx->awc_cb(kvp->value, ctx->awc_ctx);
607 }
608 
609 /**
610  * @brief Walk adjacencies on a link with a given v4 next-hop.
611  * that is visit the adjacencies with different link types.
612  */
613 void
614 adj_nbr_walk_nh4 (u32 sw_if_index,
615  const ip4_address_t *addr,
616  adj_walk_cb_t cb,
617  void *ctx)
618 {
619  if (!ADJ_NBR_ITF_OK(FIB_PROTOCOL_IP4, sw_if_index))
620  return;
621 
622  ip46_address_t nh = {
623  .ip4 = *addr,
624  };
625 
626  adj_walk_nh_ctx_t awc = {
627  .awc_ctx = ctx,
628  .awc_cb = cb,
629  .awc_nh = &nh,
630  };
631 
633  adj_nbr_tables[FIB_PROTOCOL_IP4][sw_if_index],
635  &awc);
636 }
637 
638 /**
639  * @brief Walk adjacencies on a link with a given v6 next-hop.
640  * that is visit the adjacencies with different link types.
641  */
642 void
643 adj_nbr_walk_nh6 (u32 sw_if_index,
644  const ip6_address_t *addr,
645  adj_walk_cb_t cb,
646  void *ctx)
647 {
648  if (!ADJ_NBR_ITF_OK(FIB_PROTOCOL_IP6, sw_if_index))
649  return;
650 
651  ip46_address_t nh = {
652  .ip6 = *addr,
653  };
654 
655  adj_walk_nh_ctx_t awc = {
656  .awc_ctx = ctx,
657  .awc_cb = cb,
658  .awc_nh = &nh,
659  };
660 
662  adj_nbr_tables[FIB_PROTOCOL_IP6][sw_if_index],
664  &awc);
665 }
666 
667 /**
668  * @brief Walk adjacencies on a link with a given next-hop.
669  * that is visit the adjacencies with different link types.
670  */
671 void
672 adj_nbr_walk_nh (u32 sw_if_index,
673  fib_protocol_t adj_nh_proto,
674  const ip46_address_t *nh,
675  adj_walk_cb_t cb,
676  void *ctx)
677 {
678  if (!ADJ_NBR_ITF_OK(adj_nh_proto, sw_if_index))
679  return;
680 
681  adj_walk_nh_ctx_t awc = {
682  .awc_ctx = ctx,
683  .awc_cb = cb,
684  .awc_nh = nh,
685  };
686 
688  adj_nbr_tables[adj_nh_proto][sw_if_index],
690  &awc);
691 }
692 
693 /**
694  * Flags associated with the interface state walks
695  */
697 {
700 
701 /**
702  * Context for the state change walk of the DB
703  */
705 {
706  /**
707  * Flags on the interface
708  */
711 
712 static adj_walk_rc_t
714  void *arg)
715 {
716  /*
717  * Back walk the graph to inform the forwarding entries
718  * that this interface state has changed. Do this synchronously
719  * since this is the walk that provides convergence
720  */
722 
723  fib_node_back_walk_ctx_t bw_ctx = {
724  .fnbw_reason = ((ctx->flags & ADJ_NBR_INTERFACE_UP) ?
727  /*
728  * the force sync applies only as far as the first fib_entry.
729  * And it's the fib_entry's we need to converge away from
730  * the adjacencies on the now down link
731  */
732  .fnbw_flags = (!(ctx->flags & ADJ_NBR_INTERFACE_UP) ?
734  0),
735  };
736 
737  fib_walk_sync(FIB_NODE_TYPE_ADJ, ai, &bw_ctx);
738 
739  return (ADJ_WALK_RC_CONTINUE);
740 }
741 
742 /**
743  * @brief Registered function for SW interface state changes
744  */
745 static clib_error_t *
747  u32 sw_if_index,
748  u32 flags)
749 {
750  fib_protocol_t proto;
751 
752  /*
753  * walk each adj on the interface and trigger a walk from that adj
754  */
755  for (proto = FIB_PROTOCOL_IP4; proto <= FIB_PROTOCOL_IP6; proto++)
756  {
758  .flags = ((flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) ?
760  0),
761  };
762 
763  adj_nbr_walk(sw_if_index, proto,
765  &ctx);
766  }
767 
768  return (NULL);
769 }
770 
774 
775 /**
776  * @brief Invoked on each SW interface of a HW interface when the
777  * HW interface state changes
778  */
779 static void
781  u32 sw_if_index,
782  void *arg)
783 {
785  fib_protocol_t proto;
786 
787  /*
788  * walk each adj on the interface and trigger a walk from that adj
789  */
790  for (proto = FIB_PROTOCOL_IP4; proto <= FIB_PROTOCOL_IP6; proto++)
791  {
792  adj_nbr_walk(sw_if_index, proto,
794  ctx);
795  }
796 }
797 
798 /**
799  * @brief Registered callback for HW interface state changes
800  */
801 static clib_error_t *
803  u32 hw_if_index,
804  u32 flags)
805 {
806  /*
807  * walk SW interface on the HW
808  */
810  .flags = ((flags & VNET_HW_INTERFACE_FLAG_LINK_UP) ?
812  0),
813  };
814 
815  vnet_hw_interface_walk_sw(vnm, hw_if_index,
817  &ctx);
818 
819  return (NULL);
820 }
821 
825 
826 static adj_walk_rc_t
828  void *arg)
829 {
830  /*
831  * Back walk the graph to inform the forwarding entries
832  * that this interface has been deleted.
833  */
834  fib_node_back_walk_ctx_t bw_ctx = {
836  };
837 
838  fib_walk_sync(FIB_NODE_TYPE_ADJ, ai, &bw_ctx);
839 
840  return (ADJ_WALK_RC_CONTINUE);
841 }
842 
843 /**
844  * adj_nbr_interface_add_del
845  *
846  * Registered to receive interface Add and delete notifications
847  */
848 static clib_error_t *
850  u32 sw_if_index,
851  u32 is_add)
852 {
853  fib_protocol_t proto;
854 
855  if (is_add)
856  {
857  /*
858  * not interested in interface additions. we will not back walk
859  * to resolve paths through newly added interfaces. Why? The control
860  * plane should have the brains to add interfaces first, then routes.
861  * So the case where there are paths with a interface that matches
862  * one just created is the case where the path resolved through an
863  * interface that was deleted, and still has not been removed. The
864  * new interface added, is NO GUARANTEE that the interface being
865  * added now, even though it may have the same sw_if_index, is the
866  * same interface that the path needs. So tough!
867  * If the control plane wants these routes to resolve it needs to
868  * remove and add them again.
869  */
870  return (NULL);
871  }
872 
873  for (proto = FIB_PROTOCOL_IP4; proto <= FIB_PROTOCOL_IP6; proto++)
874  {
875  adj_nbr_walk(sw_if_index, proto,
877  NULL);
878  }
879 
880  return (NULL);
881 
882 }
883 
885 
886 
887 static adj_walk_rc_t
889  void *arg)
890 {
891  vlib_cli_output (arg, "[@%d] %U",
892  ai,
895 
896  return (ADJ_WALK_RC_CONTINUE);
897 }
898 
899 static clib_error_t *
901  unformat_input_t * input,
902  vlib_cli_command_t * cmd)
903 {
905  u32 sw_if_index = ~0;
906 
908  {
909  if (unformat (input, "%d", &ai))
910  ;
911  else if (unformat (input, "%U",
913  &sw_if_index))
914  ;
915  else
916  break;
917  }
918 
919  if (ADJ_INDEX_INVALID != ai)
920  {
921  vlib_cli_output (vm, "[@%d] %U",
922  ai,
925  }
926  else if (~0 != sw_if_index)
927  {
928  fib_protocol_t proto;
929 
930  for (proto = FIB_PROTOCOL_IP4; proto <= FIB_PROTOCOL_IP6; proto++)
931  {
932  adj_nbr_walk(sw_if_index, proto,
934  vm);
935  }
936  }
937  else
938  {
939  fib_protocol_t proto;
940 
941  for (proto = FIB_PROTOCOL_IP4; proto <= FIB_PROTOCOL_IP6; proto++)
942  {
943  vec_foreach_index(sw_if_index, adj_nbr_tables[proto])
944  {
945  adj_nbr_walk(sw_if_index, proto,
947  vm);
948  }
949  }
950  }
951 
952  return 0;
953 }
954 
955 /*?
956  * Show all neighbour adjacencies.
957  * @cliexpar
958  * @cliexstart{sh adj nbr}
959  * [@2] ipv4 via 1.0.0.2 loop0: IP4: 00:00:22:aa:bb:cc -> 00:00:11:aa:bb:cc
960  * [@3] mpls via 1.0.0.2 loop0: MPLS_UNICAST: 00:00:22:aa:bb:cc -> 00:00:11:aa:bb:cc
961  * [@4] ipv4 via 1.0.0.3 loop0: IP4: 00:00:22:aa:bb:cc -> 00:00:11:aa:bb:cc
962  * [@5] mpls via 1.0.0.3 loop0: MPLS_UNICAST: 00:00:22:aa:bb:cc -> 00:00:11:aa:bb:cc
963  * @cliexend
964  ?*/
965 VLIB_CLI_COMMAND (ip4_show_fib_command, static) = {
966  .path = "show adj nbr",
967  .short_help = "show adj nbr [<adj_index>] [interface]",
968  .function = adj_nbr_show,
969 };
970 
971 static ip46_type_t
973 {
974  switch (proto)
975  {
976  case FIB_PROTOCOL_IP4:
977  return (IP46_TYPE_IP4);
978  case FIB_PROTOCOL_IP6:
979  return (IP46_TYPE_IP6);
980  default:
981  return (IP46_TYPE_IP4);
982  }
983  return (IP46_TYPE_IP4);
984 }
985 
986 u8*
987 format_adj_nbr_incomplete (u8* s, va_list *ap)
988 {
989  index_t index = va_arg(*ap, index_t);
990  CLIB_UNUSED(u32 indent) = va_arg(*ap, u32);
991  vnet_main_t * vnm = vnet_get_main();
992  ip_adjacency_t * adj = adj_get(index);
993 
994  s = format (s, "arp-%U", format_vnet_link, adj->ia_link);
995  s = format (s, ": via %U",
996  format_ip46_address, &adj->sub_type.nbr.next_hop,
998  s = format (s, " %U",
1000  vnm,
1002  adj->rewrite_header.sw_if_index));
1003 
1004  return (s);
1005 }
1006 
1007 u8*
1008 format_adj_nbr (u8* s, va_list *ap)
1009 {
1010  index_t index = va_arg(*ap, index_t);
1011  CLIB_UNUSED(u32 indent) = va_arg(*ap, u32);
1012  ip_adjacency_t * adj = adj_get(index);
1013 
1014  s = format (s, "%U", format_vnet_link, adj->ia_link);
1015  s = format (s, " via %U ",
1016  format_ip46_address, &adj->sub_type.nbr.next_hop,
1018  s = format (s, "%U",
1020  &adj->rewrite_header, sizeof (adj->rewrite_data), 0);
1021 
1022  return (s);
1023 }
1024 
1025 static void
1027 {
1028  adj_lock(dpo->dpoi_index);
1029 }
1030 static void
1032 {
1033  adj_unlock(dpo->dpoi_index);
1034 }
1035 
1036 static void
1038 {
1039  fib_show_memory_usage("Adjacency",
1041  pool_len(adj_pool),
1042  sizeof(ip_adjacency_t));
1043 }
1044 
1045 const static dpo_vft_t adj_nbr_dpo_vft = {
1046  .dv_lock = adj_dpo_lock,
1047  .dv_unlock = adj_dpo_unlock,
1048  .dv_format = format_adj_nbr,
1049  .dv_mem_show = adj_mem_show,
1050  .dv_get_urpf = adj_dpo_get_urpf,
1051 };
1052 const static dpo_vft_t adj_nbr_incompl_dpo_vft = {
1053  .dv_lock = adj_dpo_lock,
1054  .dv_unlock = adj_dpo_unlock,
1055  .dv_format = format_adj_nbr_incomplete,
1056  .dv_get_urpf = adj_dpo_get_urpf,
1057 };
1058 
1059 /**
1060  * @brief The per-protocol VLIB graph nodes that are assigned to an adjacency
1061  * object.
1062  *
1063  * this means that these graph nodes are ones from which a nbr is the
1064  * parent object in the DPO-graph.
1065  */
1066 const static char* const nbr_ip4_nodes[] =
1067 {
1068  "ip4-rewrite",
1069  NULL,
1070 };
1071 const static char* const nbr_ip6_nodes[] =
1072 {
1073  "ip6-rewrite",
1074  NULL,
1075 };
1076 const static char* const nbr_mpls_nodes[] =
1077 {
1078  "mpls-output",
1079  NULL,
1080 };
1081 const static char* const nbr_ethernet_nodes[] =
1082 {
1083  "adj-l2-rewrite",
1084  NULL,
1085 };
1086 const static char* const * const nbr_nodes[DPO_PROTO_NUM] =
1087 {
1092 };
1093 
1094 const static char* const nbr_incomplete_ip4_nodes[] =
1095 {
1096  "ip4-arp",
1097  NULL,
1098 };
1099 const static char* const nbr_incomplete_ip6_nodes[] =
1100 {
1101  "ip6-discover-neighbor",
1102  NULL,
1103 };
1104 const static char* const nbr_incomplete_mpls_nodes[] =
1105 {
1106  "mpls-adj-incomplete",
1107  NULL,
1108 };
1109 
1110 const static char* const * const nbr_incomplete_nodes[DPO_PROTO_NUM] =
1111 {
1115 };
1116 
1117 void
1119 {
1121  &adj_nbr_dpo_vft,
1122  nbr_nodes);
1124  &adj_nbr_incompl_dpo_vft,
1125  nbr_incomplete_nodes);
1126 }
#define vec_validate(V, I)
Make sure vector is long enough for given index (no header, unspecified alignment) ...
Definition: vec.h:432
dpo_lock_fn_t dv_lock
A reference counting lock function.
Definition: dpo.h:382
void adj_nbr_walk_nh(u32 sw_if_index, fib_protocol_t adj_nh_proto, const ip46_address_t *nh, adj_walk_cb_t cb, void *ctx)
Walk adjacencies on a link with a given next-hop.
Definition: adj_nbr.c:672
static clib_error_t * adj_nbr_hw_interface_state_change(vnet_main_t *vnm, u32 hw_if_index, u32 flags)
Registered callback for HW interface state changes.
Definition: adj_nbr.c:802
#define vec_foreach_index(var, v)
Iterate over vector indices.
adj_flags_t ia_flags
Flags on the adjacency 1-bytes.
Definition: adj.h:208
Context for a walk of the adjacency neighbour DB.
Definition: adj_nbr.c:550
ip_adjacency_t * adj_pool
The global adjacnecy pool.
Definition: adj.c:30
void vnet_rewrite_init(vnet_main_t *vnm, u32 sw_if_index, u32 this_node, u32 next_node, vnet_rewrite_header_t *rw)
Definition: rewrite.c:103
#define CLIB_UNUSED(x)
Definition: clib.h:79
A virtual function table regisitered for a DPO type.
Definition: dpo.h:377
ip46_type_t
Definition: format.h:63
enum adj_nbr_interface_flags_t_ adj_nbr_interface_flags_t
Flags associated with the interface state walks.
u8 * format_adj_nbr(u8 *s, va_list *ap)
Format a neigbour (REWRITE) adjacency.
Definition: adj_nbr.c:1008
static ip46_type_t adj_proto_to_46(fib_protocol_t proto)
Definition: adj_nbr.c:972
void adj_lock(adj_index_t adj_index)
Take a reference counting lock on the adjacency.
Definition: adj.c:222
An indication that the rewrite is complete, i.e.
Definition: adj_nbr.h:98
vnet_main_t * vnet_get_main(void)
Definition: misc.c:47
static const char *const nbr_ethernet_nodes[]
Definition: adj_nbr.c:1081
static const char *const nbr_incomplete_ip6_nodes[]
Definition: adj_nbr.c:1099
static adj_walk_rc_t adj_nbr_interface_state_change_one(adj_index_t ai, void *arg)
Definition: adj_nbr.c:713
void vnet_hw_interface_walk_sw(vnet_main_t *vnm, u32 hw_if_index, vnet_hw_sw_interface_walk_t fn, void *ctx)
Walk the SW interfaces on a HW interface - this is the super interface and any sub-interfaces.
Definition: interface.c:967
#define NULL
Definition: clib.h:55
IP unicast adjacency.
Definition: adj.h:174
Context for the state change walk of the DB.
Definition: adj_nbr.c:704
This packet is to be rewritten and forwarded to the next processing node.
Definition: adj.h:73
u32 index_t
A Data-Path Object is an object that represents actions that are applied to packets are they are swit...
Definition: dpo.h:41
format_function_t format_ip46_address
Definition: format.h:61
ip_lookup_main_t lookup_main
Definition: ip4.h:97
adj_walk_cb_t awc_cb
Definition: adj_nbr.c:552
void adj_nbr_walk_nh4(u32 sw_if_index, const ip4_address_t *addr, adj_walk_cb_t cb, void *ctx)
Walk adjacencies on a link with a given v4 next-hop.
Definition: adj_nbr.c:614
static vnet_sw_interface_t * vnet_get_sw_interface(vnet_main_t *vnm, u32 sw_if_index)
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:419
unformat_function_t unformat_vnet_sw_interface
u8 * format_adj_nbr_incomplete(u8 *s, va_list *ap)
Format aa incomplete neigbour (ARP) adjacency.
Definition: adj_nbr.c:987
#define VNET_HW_INTERFACE_FLAG_LINK_UP
Definition: interface.h:394
static const char *const nbr_incomplete_mpls_nodes[]
Definition: adj_nbr.c:1104
u32 adj_dpo_get_urpf(const dpo_id_t *dpo)
Definition: adj.c:212
adj_index_t adj_nbr_add_or_lock_w_rewrite(fib_protocol_t nh_proto, vnet_link_t link_type, const ip46_address_t *nh_addr, u32 sw_if_index, u8 *rewrite)
Add (and lock) a new or lock an existing neighbour adjacency.
Definition: adj_nbr.c:254
#define ip46_address_cmp(ip46_1, ip46_2)
Definition: ip6_packet.h:80
static uword vlib_node_add_next(vlib_main_t *vm, uword node, uword next_node)
Definition: node_funcs.h:1108
ip_lookup_next_t
An adjacency is a representation of an attached L3 peer.
Definition: adj.h:50
#define pool_len(p)
Number of elements in pool vector.
Definition: pool.h:140
enum fib_protocol_t_ fib_protocol_t
Protocol Type.
#define vlib_worker_thread_barrier_sync(X)
Definition: threads.h:212
vnet_link_t ia_link
link/ether-type 1 bytes
Definition: adj.h:195
u8 output_feature_arc_index
Definition: lookup.h:137
static clib_error_t * adj_nbr_sw_interface_state_change(vnet_main_t *vnm, u32 sw_if_index, u32 flags)
Registered function for SW interface state changes.
Definition: adj_nbr.c:746
static ip_adjacency_t * adj_get(adj_index_t adj_index)
Get a pointer to an adjacency object from its index.
Definition: adj.h:365
vlib_node_registration_t ip6_discover_neighbor_node
(constructor) VLIB_REGISTER_NODE (ip6_discover_neighbor_node)
Definition: ip6_forward.c:1894
VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION_PRIO(adj_nbr_sw_interface_state_change, VNET_ITF_FUNC_PRIORITY_HIGH)
void dpo_register(dpo_type_t type, const dpo_vft_t *vft, const char *const *const *nodes)
For a given DPO type Register:
Definition: dpo.c:306
int clib_bihash_add_del(clib_bihash *h, clib_bihash_kv *add_v, int is_add)
Add or delete a (key,value) pair from a bi-hash table.
format_function_t format_ip_adjacency
Definition: format.h:58
void fib_walk_sync(fib_node_type_t parent_type, fib_node_index_t parent_index, fib_node_back_walk_ctx_t *ctx)
Back walk all the children of a FIB node.
Definition: fib_walk.c:727
static void vnet_rewrite_clear_data_internal(vnet_rewrite_header_t *rw, int max_size)
Definition: rewrite.h:120
static const char *const nbr_incomplete_ip4_nodes[]
Definition: adj_nbr.c:1094
static BVT(clib_bihash)
Definition: adj_nbr.c:26
enum adj_walk_rc_t_ adj_walk_rc_t
return codes from a adjacency walker callback function
static clib_error_t * adj_nbr_show(vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd)
Definition: adj_nbr.c:900
struct adj_walk_ctx_t_ adj_walk_ctx_t
Context for a walk of the adjacency neighbour DB.
static const char *const nbr_mpls_nodes[]
Definition: adj_nbr.c:1076
static void adj_nbr_walk_cb(BVT(clib_bihash_kv)*kvp, void *arg)
Definition: adj_nbr.c:557
static void adj_dpo_lock(dpo_id_t *dpo)
Definition: adj_nbr.c:1026
void fib_show_memory_usage(const char *name, u32 in_use_elts, u32 allocd_elts, size_t size_elt)
Show the memory usage for a type.
Definition: fib_node.c:220
unsigned long u64
Definition: types.h:89
void adj_unlock(adj_index_t adj_index)
Release a reference counting lock on the adjacency.
Definition: adj.c:239
void vnet_update_adjacency_for_sw_interface(vnet_main_t *vnm, u32 sw_if_index, u32 ai)
Definition: rewrite.c:217
static const char *const nbr_ip6_nodes[]
Definition: adj_nbr.c:1071
static void adj_nbr_evaluate_feature(adj_index_t ai)
Check and set feature flags if o/p interface has any o/p features.
Definition: adj_nbr.c:139
format_function_t format_vnet_rewrite
Definition: rewrite.h:338
u8 output_feature_arc_index
Definition: mpls.h:57
u32 adj_nbr_db_size(void)
Return the size of the adjacency database.
Definition: adj_nbr.c:523
Context for a walk of the adjacency neighbour DB.
Definition: adj_nbr.c:589
#define ADJ_NBR_DEFAULT_HASH_NUM_BUCKETS
vlib_node_registration_t ip4_arp_node
(constructor) VLIB_REGISTER_NODE (ip4_arp_node)
Definition: ip4_forward.c:2156
The identity of a DPO is a combination of its type and its instance number/index of objects of that t...
Definition: dpo.h:166
fib_node_bw_reason_flag_t fnbw_reason
The reason/trigger for the backwalk.
Definition: fib_node.h:203
format_function_t format_vnet_sw_interface_name
static void adj_nbr_hw_sw_interface_state_change(vnet_main_t *vnm, u32 sw_if_index, void *arg)
Invoked on each SW interface of a HW interface when the HW interface state changes.
Definition: adj_nbr.c:780
#define ADJ_INDEX_INVALID
Invalid ADJ index - used when no adj is known likewise blazoned capitals INVALID speak volumes where ...
Definition: adj_types.h:36
void adj_nbr_remove(adj_index_t ai, fib_protocol_t nh_proto, vnet_link_t link_type, const ip46_address_t *nh_addr, u32 sw_if_index)
Definition: adj_nbr.c:79
struct ip_adjacency_t_::@38::@39 nbr
IP_LOOKUP_NEXT_ARP/IP_LOOKUP_NEXT_REWRITE.
struct _unformat_input_t unformat_input_t
static adj_index_t adj_get_index(ip_adjacency_t *adj)
Get a pointer to an adjacency object from its index.
Definition: adj_internal.h:86
static clib_error_t * adj_nbr_interface_add_del(vnet_main_t *vnm, u32 sw_if_index, u32 is_add)
adj_nbr_interface_add_del
Definition: adj_nbr.c:849
const ip46_address_t * awc_nh
Definition: adj_nbr.c:593
static void adj_nbr_walk_nh_cb(BVT(clib_bihash_kv)*kvp, void *arg)
Definition: adj_nbr.c:597
#define ADJ_NBR_DEFAULT_HASH_MEMORY_SIZE
void adj_nbr_module_init(void)
Module initialisation.
Definition: adj_nbr.c:1118
void clib_bihash_init(clib_bihash *h, char *name, u32 nbuckets, uword memory_size)
initialize a bounded index extensible hash table
union ip_adjacency_t_::@38 sub_type
#define ADJ_NBR_SET_KEY(_key, _lt, _nh)
void clib_bihash_foreach_key_value_pair(clib_bihash *h, void *callback, void *arg)
Visit active (key,value) pairs in a bi-hash table.
Currently a sync walk is active.
Definition: adj.h:156
This packet matches an "incomplete adjacency" and packets need to be passed to ARP to find rewrite st...
Definition: adj.h:63
#define UNFORMAT_END_OF_INPUT
Definition: format.h:143
mpls_main_t mpls_main
Definition: mpls.c:25
vlib_main_t * vm
Definition: buffer.c:283
#define vec_free(V)
Free vector&#39;s memory (no header).
Definition: vec.h:336
static adj_walk_rc_t adj_nbr_show_one(adj_index_t ai, void *arg)
Definition: adj_nbr.c:888
Force the walk to be synchronous.
Definition: fib_node.h:165
u32 vnet_tx_node_index_for_sw_interface(vnet_main_t *vnm, u32 sw_if_index)
Definition: rewrite.c:96
static void vnet_rewrite_set_data_internal(vnet_rewrite_header_t *rw, int max_size, void *data, int data_bytes)
Definition: rewrite.h:130
adj_walk_rc_t(* adj_walk_cb_t)(adj_index_t ai, void *ctx)
Call back function when walking adjacencies.
Definition: adj_types.h:50
u32 adj_index_t
An index for adjacencies.
Definition: adj_types.h:30
static void adj_mem_show(void)
Definition: adj_nbr.c:1037
static ip_adjacency_t * adj_nbr_alloc(fib_protocol_t nh_proto, vnet_link_t link_type, const ip46_address_t *nh_addr, u32 sw_if_index)
Definition: adj_nbr.c:176
void adj_nbr_walk(u32 sw_if_index, fib_protocol_t adj_nh_proto, adj_walk_cb_t cb, void *ctx)
Walk the neighbour Adjacencies on a given interface.
Definition: adj_nbr.c:567
i16 ** feature_count_by_sw_if_index
feature reference counts by interface
Definition: feature.h:90
Context passed between object during a back walk.
Definition: fib_node.h:199
#define VLIB_CLI_COMMAND(x,...)
Definition: cli.h:154
VNET_HW_INTERFACE_LINK_UP_DOWN_FUNCTION_PRIO(adj_nbr_hw_interface_state_change, VNET_ITF_FUNC_PRIORITY_HIGH)
#define VNET_SW_INTERFACE_FLAG_ADMIN_UP
Definition: interface.h:576
adj_nbr_interface_flags_t flags
Flags on the interface.
Definition: adj_nbr.c:709
#define ASSERT(truth)
unsigned int u32
Definition: types.h:88
ip6_main_t ip6_main
Definition: ip6_forward.c:3009
ip_lookup_main_t lookup_main
Definition: ip6.h:158
int clib_bihash_search(clib_bihash *h, clib_bihash_kv *search_v, clib_bihash_kv *return_v)
Search a bi-hash table.
long ctx[MAX_CONNS]
Definition: main.c:122
enum vnet_link_t_ vnet_link_t
Link Type: A description of the protocol of packets on the link.
void * awc_ctx
Definition: adj_nbr.c:553
static const char *const nbr_ip4_nodes[]
The per-protocol VLIB graph nodes that are assigned to an adjacency object.
Definition: adj_nbr.c:1066
static u32 adj_get_rewrite_node(vnet_link_t linkt)
Definition: adj_internal.h:46
static u32 adj_get_nd_node(fib_protocol_t proto)
Definition: adj_nbr.c:121
static vlib_main_t * vlib_get_main(void)
Definition: global_funcs.h:23
fib_protocol_t ia_nh_proto
The protocol of the neighbor/peer.
Definition: adj.h:202
struct adj_walk_nh_ctx_t_ adj_walk_nh_ctx_t
Context for a walk of the adjacency neighbour DB.
#define DPO_PROTO_NUM
Definition: dpo.h:70
index_t dpoi_index
the index of objects of that type
Definition: dpo.h:182
#define vec_len(v)
Number of elements in vector (rvalue-only, NULL tolerant)
unsigned char u8
Definition: types.h:56
ip_lookup_next_t lookup_next_index
Next hop after ip4-lookup.
Definition: adj.h:189
void adj_nbr_update_rewrite_internal(ip_adjacency_t *adj, ip_lookup_next_t adj_next_index, u32 this_node, u32 next_node, u8 *rewrite)
adj_nbr_update_rewrite_internal
Definition: adj_nbr.c:333
enum adj_nbr_rewrite_flag_t_ adj_nbr_rewrite_flag_t
When adding a rewrite to an adjacency these are flags that apply to that rewrite. ...
ip_adjacency_t * adj_alloc(fib_protocol_t proto)
Definition: adj.c:48
static void adj_db_count(BVT(clib_bihash_kv)*kvp, void *arg)
Definition: adj_nbr.c:515
static adj_walk_rc_t adj_nbr_interface_delete_one(adj_index_t ai, void *arg)
Definition: adj_nbr.c:827
#define FIB_PROTOCOL_MAX
Definition outside of enum so it does not need to be included in non-defaulted switch statements...
Definition: fib_types.h:51
adj_walk_cb_t awc_cb
Definition: adj_nbr.c:591
static void * clib_mem_alloc_aligned(uword size, uword align)
Definition: mem.h:120
short i16
Definition: types.h:46
adj_nbr_interface_flags_t_
Flags associated with the interface state walks.
Definition: adj_nbr.c:696
void vlib_worker_thread_barrier_release(vlib_main_t *vm)
Definition: threads.c:1491
ip4_main_t ip4_main
Global ip4 main structure.
Definition: ip4_forward.c:1181
adj_index_t adj_nbr_add_or_lock(fib_protocol_t nh_proto, vnet_link_t link_type, const ip46_address_t *nh_addr, u32 sw_if_index)
Neighbour Adjacency sub-type.
Definition: adj_nbr.c:214
struct adj_db_count_ctx_t_ adj_db_count_ctx_t
vnet_link_t fib_proto_to_link(fib_protocol_t proto)
Convert from a protocol to a link type.
Definition: fib_types.c:245
u8 * format_vnet_link(u8 *s, va_list *ap)
Definition: fib_types.c:38
VNET_SW_INTERFACE_ADD_DEL_FUNCTION(adj_nbr_interface_add_del)
vhost_vring_addr_t addr
Definition: vhost-user.h:83
static void adj_dpo_unlock(dpo_id_t *dpo)
Definition: adj_nbr.c:1031
u32 flags
Definition: vhost-user.h:77
#define CLIB_CACHE_LINE_BYTES
Definition: cache.h:67
#define ADJ_NBR_ITF_OK(_proto, _itf)
static adj_index_t adj_nbr_find(fib_protocol_t nh_proto, vnet_link_t link_type, const ip46_address_t *nh_addr, u32 sw_if_index)
Definition: adj_nbr.c:97
This adjacency/interface has output features configured.
Definition: rewrite.h:57
vnet_feature_main_t feature_main
Definition: feature.c:19
void adj_nbr_update_rewrite(adj_index_t adj_index, adj_nbr_rewrite_flag_t flags, u8 *rewrite)
adj_nbr_update_rewrite
Definition: adj_nbr.c:291
void vlib_cli_output(vlib_main_t *vm, char *fmt,...)
Definition: cli.c:680
struct adj_nbr_interface_state_change_ctx_t_ adj_nbr_interface_state_change_ctx_t
Context for the state change walk of the DB.
uword unformat(unformat_input_t *i, const char *fmt,...)
Definition: unformat.c:972
static uword unformat_check_input(unformat_input_t *i)
Definition: format.h:169
void adj_nbr_walk_nh6(u32 sw_if_index, const ip6_address_t *addr, adj_walk_cb_t cb, void *ctx)
Walk adjacencies on a link with a given v6 next-hop.
Definition: adj_nbr.c:643
static uword pool_elts(void *v)
Number of active elements in a pool.
Definition: pool.h:128