FD.io VPP  v19.04.4-rc0-5-ge88582fac
Vector Packet Processing
arp.c
Go to the documentation of this file.
1 /*
2  * ethernet/arp.c: IP v4 ARP node
3  *
4  * Copyright (c) 2010 Cisco and/or its affiliates.
5  * Licensed under the Apache License, Version 2.0 (the "License");
6  * you may not use this file except in compliance with the License.
7  * You may obtain a copy of the License at:
8  *
9  * http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17 
18 #include <vnet/ip/ip.h>
19 #include <vnet/ip/ip_neighbor.h>
20 #include <vnet/ip/ip6.h>
21 #include <vnet/ethernet/ethernet.h>
22 #include <vnet/ethernet/arp.h>
23 #include <vnet/l2/l2_input.h>
24 #include <vppinfra/mhash.h>
25 #include <vnet/fib/ip4_fib.h>
26 #include <vnet/fib/fib_entry_src.h>
27 #include <vnet/adj/adj_nbr.h>
28 #include <vnet/adj/adj_mcast.h>
29 #include <vnet/mpls/mpls.h>
30 #include <vnet/l2/feat_bitmap.h>
31 
32 /**
33  * @file
34  * @brief IPv4 ARP.
35  *
36  * This file contains code to manage the IPv4 ARP tables (IP Address
37  * to MAC Address lookup).
38  */
39 
40 
41 void vl_api_rpc_call_main_thread (void *fp, u8 * data, u32 data_length);
42 
43 /**
44  * @brief Per-interface ARP configuration and state
45  */
47 {
48  /**
49  * Hash table of ARP entries.
50  * Since this hash table is per-interface, the key is only the IPv4 address.
51  */
54 
55 typedef struct
56 {
61 
62 typedef struct
63 {
68  /* Used for arp event notification only */
72 
73 typedef struct
74 {
75  /* Hash tables mapping name to opcode. */
77 
78  /* lite beer "glean" adjacency handling */
81 
82  /* Mac address change notification */
85 
87 
88  /* ARP attack mitigation */
91 
92  /** Per interface state */
94 
95  /* Proxy arp vector */
97 
101 
103 
104 typedef struct
105 {
111 #define ETHERNET_ARP_ARGS_REMOVE (1<<0)
112 #define ETHERNET_ARP_ARGS_FLUSH (1<<1)
113 #define ETHERNET_ARP_ARGS_POPULATE (1<<2)
114 #define ETHERNET_ARP_ARGS_WC_PUB (1<<3)
116 
117 static const u8 vrrp_prefix[] = { 0x00, 0x00, 0x5E, 0x00, 0x01 };
118 
119 /* Node index for send_garp_na_process */
121 
122 static void
124  * a);
125 
126 static u8 *
128 {
130  char *t = 0;
131  switch (h)
132  {
133 #define _(n,f) case n: t = #f; break;
135 #undef _
136 
137  default:
138  return format (s, "unknown 0x%x", h);
139  }
140 
141  return format (s, "%s", t);
142 }
143 
144 static u8 *
145 format_ethernet_arp_opcode (u8 * s, va_list * va)
146 {
148  char *t = 0;
149  switch (o)
150  {
151 #define _(f) case ETHERNET_ARP_OPCODE_##f: t = #f; break;
153 #undef _
154 
155  default:
156  return format (s, "unknown 0x%x", o);
157  }
158 
159  return format (s, "%s", t);
160 }
161 
162 static uword
164  va_list * args)
165 {
166  int *result = va_arg (*args, int *);
168  int x, i;
169 
170  /* Numeric opcode. */
171  if (unformat (input, "0x%x", &x) || unformat (input, "%d", &x))
172  {
173  if (x >= (1 << 16))
174  return 0;
175  *result = x;
176  return 1;
177  }
178 
179  /* Named type. */
181  am->opcode_by_name, &i))
182  {
183  *result = i;
184  return 1;
185  }
186 
187  return 0;
188 }
189 
190 static uword
192  va_list * args)
193 {
194  int *result = va_arg (*args, int *);
195  if (!unformat_user
197  return 0;
198 
199  *result = clib_host_to_net_u16 ((u16) * result);
200  return 1;
201 }
202 
203 static u8 *
204 format_ethernet_arp_header (u8 * s, va_list * va)
205 {
206  ethernet_arp_header_t *a = va_arg (*va, ethernet_arp_header_t *);
207  u32 max_header_bytes = va_arg (*va, u32);
208  u32 indent;
209  u16 l2_type, l3_type;
210 
211  if (max_header_bytes != 0 && sizeof (a[0]) > max_header_bytes)
212  return format (s, "ARP header truncated");
213 
214  l2_type = clib_net_to_host_u16 (a->l2_type);
215  l3_type = clib_net_to_host_u16 (a->l3_type);
216 
217  indent = format_get_indent (s);
218 
219  s = format (s, "%U, type %U/%U, address size %d/%d",
220  format_ethernet_arp_opcode, clib_net_to_host_u16 (a->opcode),
222  format_ethernet_type, l3_type,
224 
225  if (l2_type == ETHERNET_ARP_HARDWARE_TYPE_ethernet
226  && l3_type == ETHERNET_TYPE_IP4)
227  {
228  s = format (s, "\n%U%U/%U -> %U/%U",
229  format_white_space, indent,
234  }
235  else
236  {
237  uword n2 = a->n_l2_address_bytes;
238  uword n3 = a->n_l3_address_bytes;
239  s = format (s, "\n%U%U/%U -> %U/%U",
240  format_white_space, indent,
241  format_hex_bytes, a->data + 0 * n2 + 0 * n3, n2,
242  format_hex_bytes, a->data + 1 * n2 + 0 * n3, n3,
243  format_hex_bytes, a->data + 1 * n2 + 1 * n3, n2,
244  format_hex_bytes, a->data + 2 * n2 + 1 * n3, n3);
245  }
246 
247  return s;
248 }
249 
250 u8 *
252 {
253  vnet_main_t *vnm = va_arg (*va, vnet_main_t *);
256  u8 *flags = 0;
257 
258  if (!e)
259  return format (s, "%=12s%=16s%=6s%=20s%=24s", "Time", "IP4",
260  "Flags", "Ethernet", "Interface");
261 
262  si = vnet_get_sw_interface (vnm, e->sw_if_index);
263 
265  flags = format (flags, "S");
266 
268  flags = format (flags, "D");
269 
271  flags = format (flags, "N");
272 
273  s = format (s, "%=12U%=16U%=6s%=20U%U",
276  flags ? (char *) flags : "",
279 
280  vec_free (flags);
281  return s;
282 }
283 
284 typedef struct
285 {
286  u8 packet_data[64];
288 
289 static u8 *
291 {
292  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
293  CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
295 
296  s = format (s, "%U",
298  t->packet_data, sizeof (t->packet_data));
299 
300  return s;
301 }
302 
303 static u8 *
304 format_arp_term_input_trace (u8 * s, va_list * va)
305 {
306  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
307  CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
309 
310  /* arp-term trace data saved is either arp or ip6/icmp6 packet:
311  - for arp, the 1st 16-bit field is hw type of value of 0x0001.
312  - for ip6, the first nibble has value of 6. */
313  s = format (s, "%U", t->packet_data[0] == 0 ?
315  t->packet_data, sizeof (t->packet_data));
316 
317  return s;
318 }
319 
320 static void
322 {
323  vnet_main_t *vnm = vnet_get_main ();
324  ip4_main_t *im = &ip4_main;
330  vlib_buffer_t *b;
331  vlib_main_t *vm;
332  u32 bi = 0;
333 
334  vm = vlib_get_main ();
335 
336  si = vnet_get_sw_interface (vnm, adj->rewrite_header.sw_if_index);
337 
339  {
340  return;
341  }
342 
343  src =
345  &adj->sub_type.nbr.next_hop.
346  ip4,
347  adj->rewrite_header.
348  sw_if_index, &ia);
349  if (!src)
350  {
351  return;
352  }
353 
354  h =
356  &bi);
357  if (!h)
358  return;
359 
360  hi = vnet_get_sup_hw_interface (vnm, adj->rewrite_header.sw_if_index);
361 
363 
364  h->ip4_over_ethernet[0].ip4 = src[0];
365  h->ip4_over_ethernet[1].ip4 = adj->sub_type.nbr.next_hop.ip4;
366 
367  b = vlib_get_buffer (vm, bi);
368  vnet_buffer (b)->sw_if_index[VLIB_RX] =
369  vnet_buffer (b)->sw_if_index[VLIB_TX] = adj->rewrite_header.sw_if_index;
370 
371  /* Add encapsulation string for software interface (e.g. ethernet header). */
372  vnet_rewrite_one_header (adj[0], h, sizeof (ethernet_header_t));
373  vlib_buffer_advance (b, -adj->rewrite_header.data_bytes);
374 
375  {
377  u32 *to_next = vlib_frame_vector_args (f);
378  to_next[0] = bi;
379  f->n_vectors = 1;
381  }
382 }
383 
384 static void
386 {
390  e->sw_if_index,
391  adj_get_link_type (ai), &e->mac));
392 }
393 
394 static void
396 {
397  ip_adjacency_t *adj = adj_get (ai);
398 
400  (ai,
403  adj->rewrite_header.sw_if_index,
406 }
407 
410 {
413  uword *p;
414 
415  if (NULL != eai->arp_entries)
416  {
417  p = hash_get (eai->arp_entries, addr->as_u32);
418  if (!p)
419  return (NULL);
420 
421  e = pool_elt_at_index (am->ip4_entry_pool, p[0]);
422  }
423 
424  return (e);
425 }
426 
427 static adj_walk_rc_t
429 {
431 
432  arp_mk_complete (ai, e);
433 
434  return (ADJ_WALK_RC_CONTINUE);
435 }
436 
437 static adj_walk_rc_t
439 {
440  arp_mk_incomplete (ai);
441 
442  return (ADJ_WALK_RC_CONTINUE);
443 }
444 
445 void
447 {
449  ethernet_arp_interface_t *arp_int;
451  ip_adjacency_t *adj;
452 
453  adj = adj_get (ai);
454 
455  vec_validate (am->ethernet_arp_by_sw_if_index, sw_if_index);
457  e = arp_entry_find (arp_int, &adj->sub_type.nbr.next_hop.ip4);
458 
459  switch (adj->lookup_next_index)
460  {
463  break;
464  case IP_LOOKUP_NEXT_ARP:
465  if (NULL != e)
466  {
467  adj_nbr_walk_nh4 (sw_if_index,
469  }
470  else
471  {
472  /*
473  * no matching ARP entry.
474  * construct the rewrite required to for an ARP packet, and stick
475  * that in the adj's pipe to smoke.
476  */
478  (ai,
481  (vnm,
482  sw_if_index,
485 
486  /*
487  * since the FIB has added this adj for a route, it makes sense it
488  * may want to forward traffic sometime soon. Let's send a
489  * speculative ARP. just one. If we were to do periodically that
490  * wouldn't be bad either, but that's more code than i'm prepared to
491  * write at this time for relatively little reward.
492  */
493  arp_nbr_probe (adj);
494  }
495  break;
500  (vnm,
501  sw_if_index,
504  break;
506  {
507  /*
508  * Construct a partial rewrite from the known ethernet mcast dest MAC
509  */
510  u8 *rewrite;
511  u8 offset;
512 
513  rewrite = ethernet_build_rewrite (vnm,
514  sw_if_index,
515  adj->ia_link,
517  offset = vec_len (rewrite) - 2;
518 
519  /*
520  * Complete the remaining fields of the adj's rewrite to direct the
521  * complete of the rewrite at switch time by copying in the IP
522  * dst address's bytes.
523  * Offset is 2 bytes into the MAC destination address.
524  */
525  adj_mcast_update_rewrite (ai, rewrite, offset);
526 
527  break;
528  }
529  case IP_LOOKUP_NEXT_DROP:
530  case IP_LOOKUP_NEXT_PUNT:
536  case IP_LOOKUP_N_NEXT:
537  ASSERT (0);
538  break;
539  }
540 }
541 
542 static void
544 {
545  fib_prefix_t pfx = {
546  .fp_len = 32,
547  .fp_proto = FIB_PROTOCOL_IP4,
548  .fp_addr.ip4 = e->ip4_address,
549  };
550 
551  e->fib_entry_index =
552  fib_table_entry_path_add (fib_index, &pfx, FIB_SOURCE_ADJ,
554  DPO_PROTO_IP4, &pfx.fp_addr,
555  e->sw_if_index, ~0, 1, NULL,
558 }
559 
560 static void
562 {
564  {
565  fib_prefix_t pfx = {
566  .fp_len = 32,
567  .fp_proto = FIB_PROTOCOL_IP4,
568  .fp_addr.ip4 = e->ip4_address,
569  };
570  u32 fib_index;
571 
573 
574  fib_table_entry_path_remove (fib_index, &pfx,
577  &pfx.fp_addr,
578  e->sw_if_index, ~0, 1,
581  }
582 }
583 
586 {
589  u32 count = 0;
591  if (index == ~0) /* Try again from elt 0 */
592  index = pool_next_index (am->ip4_entry_pool, index);
593 
594  /* Find a non-static random entry to free up for reuse */
595  do
596  {
597  if ((count++ == 100) || (index == ~0))
598  return NULL; /* give up after 100 entries */
599  e = pool_elt_at_index (am->ip4_entry_pool, index);
600  am->arp_delete_rotor = index;
601  index = pool_next_index (am->ip4_entry_pool, index);
602  }
603  while (e->flags & IP_NEIGHBOR_FLAG_STATIC);
604 
605  /* Remove ARP entry from its interface and update fib */
606  hash_unset
608  e->ip4_address.as_u32);
613  return e;
614 }
615 
616 static int
619  * args)
620 {
624  int make_new_arp_cache_entry = 1;
625  uword *p;
626  pending_resolution_t *pr, *mc;
627  ethernet_arp_interface_t *arp_int;
628  u32 sw_if_index = args->sw_if_index;
629 
630  vec_validate (am->ethernet_arp_by_sw_if_index, sw_if_index);
631 
633 
634  if (NULL != arp_int->arp_entries)
635  {
636  p = hash_get (arp_int->arp_entries, args->ip4.as_u32);
637  if (p)
638  {
639  e = pool_elt_at_index (am->ip4_entry_pool, p[0]);
640 
641  /* Refuse to over-write static arp. */
642  if (!(args->nbr_flags & IP_NEIGHBOR_FLAG_STATIC) &&
644  {
645  /* if MAC address match, still check to send event */
646  if (mac_address_equal (&e->mac, &args->mac))
647  goto check_customers;
648  return -2;
649  }
650  make_new_arp_cache_entry = 0;
651  }
652  }
653 
654  if (make_new_arp_cache_entry)
655  {
656  if (am->limit_arp_cache_size &&
658  {
659  e = force_reuse_arp_entry ();
660  if (NULL == e)
661  return -2;
662  }
663  else
664  pool_get (am->ip4_entry_pool, e);
665 
666  if (NULL == arp_int->arp_entries)
667  arp_int->arp_entries = hash_create (0, sizeof (u32));
668 
669  hash_set (arp_int->arp_entries, args->ip4.as_u32,
670  e - am->ip4_entry_pool);
671 
673  e->ip4_address = args->ip4;
675  mac_address_copy (&e->mac, &args->mac);
676 
678  {
679  arp_adj_fib_add (e,
681  (e->sw_if_index));
682  }
683  else
684  {
686  }
687  }
688  else
689  {
690  /*
691  * prevent a DoS attack from the data-plane that
692  * spams us with no-op updates to the MAC address
693  */
694  if (mac_address_equal (&e->mac, &args->mac))
695  {
697  goto check_customers;
698  }
699 
700  /* Update ethernet address. */
701  mac_address_copy (&e->mac, &args->mac);
702  }
703 
704  /* Update time stamp and flags. */
707  {
710  }
711  else
712  {
715  }
716 
717  adj_nbr_walk_nh4 (sw_if_index, &e->ip4_address, arp_mk_complete_walk, e);
718 
719 check_customers:
720  /* Customer(s) waiting for this address to be resolved? */
722  if (p)
723  {
724  u32 next_index;
725  next_index = p[0];
726 
727  while (next_index != (u32) ~ 0)
728  {
729  pr = pool_elt_at_index (am->pending_resolutions, next_index);
731  pr->type_opaque, pr->data);
732  next_index = pr->next_index;
733  pool_put (am->pending_resolutions, pr);
734  }
735 
737  }
738 
739  /* Customer(s) requesting ARP event for this address? */
740  p = hash_get (am->mac_changes_by_address, args->ip4.as_u32);
741  if (p)
742  {
743  u32 next_index;
744  next_index = p[0];
745 
746  while (next_index != (u32) ~ 0)
747  {
748  int rv = 1;
749  mc = pool_elt_at_index (am->mac_changes, next_index);
750 
751  /* Call the user's data callback, return 1 to suppress dup events */
752  if (mc->data_callback)
753  rv = (mc->data_callback) (mc->data, &args->mac, sw_if_index, 0);
754 
755  /*
756  * Signal the resolver process, as long as the user
757  * says they want to be notified
758  */
759  if (rv == 0)
761  mc->type_opaque, mc->data);
762  next_index = mc->next_index;
763  }
764  }
765 
766  return 0;
767 }
768 
769 void
771  void *address_arg,
772  uword node_index,
773  uword type_opaque, uword data)
774 {
776  ip4_address_t *address = address_arg;
777  uword *p;
779 
780  pool_get (am->pending_resolutions, pr);
781 
782  pr->next_index = ~0;
783  pr->node_index = node_index;
784  pr->type_opaque = type_opaque;
785  pr->data = data;
786  pr->data_callback = 0;
787 
788  p = hash_get (am->pending_resolutions_by_address, address->as_u32);
789  if (p)
790  {
791  /* Insert new resolution at the head of the list */
792  pr->next_index = p[0];
794  }
795 
797  pr - am->pending_resolutions);
798 }
799 
800 int
803  u32 pid,
804  void *address_arg,
805  uword node_index,
806  uword type_opaque, uword data, int is_add)
807 {
809  ip4_address_t *address = address_arg;
810 
811  /* Try to find an existing entry */
812  u32 *first = (u32 *) hash_get (am->mac_changes_by_address, address->as_u32);
813  u32 *p = first;
815  while (p && *p != ~0)
816  {
817  mc = pool_elt_at_index (am->mac_changes, *p);
818  if (mc->node_index == node_index && mc->type_opaque == type_opaque
819  && mc->pid == pid)
820  break;
821  p = &mc->next_index;
822  }
823 
824  int found = p && *p != ~0;
825  if (is_add)
826  {
827  if (found)
828  return VNET_API_ERROR_ENTRY_ALREADY_EXISTS;
829 
830  pool_get (am->mac_changes, mc);
831  /* *INDENT-OFF* */
832  *mc = (pending_resolution_t)
833  {
834  .next_index = ~0,
835  .node_index = node_index,
836  .type_opaque = type_opaque,
837  .data = data,
838  .data_callback = data_callback,
839  .pid = pid,
840  };
841  /* *INDENT-ON* */
842 
843  /* Insert new resolution at the end of the list */
844  u32 new_idx = mc - am->mac_changes;
845  if (p)
846  p[0] = new_idx;
847  else
848  hash_set (am->mac_changes_by_address, address->as_u32, new_idx);
849  }
850  else
851  {
852  if (!found)
853  return VNET_API_ERROR_NO_SUCH_ENTRY;
854 
855  /* Clients may need to clean up pool entries, too */
856  if (data_callback)
857  /* no new mac addrs */
858  (data_callback) (mc->data, NULL, ~0, NULL);
859 
860  /* Remove the entry from the list and delete the entry */
861  *p = mc->next_index;
862  pool_put (am->mac_changes, mc);
863 
864  /* Remove from hash if we deleted the last entry */
865  if (*p == ~0 && p == first)
866  hash_unset (am->mac_changes_by_address, address->as_u32);
867  }
868  return 0;
869 }
870 
871 /* Either we drop the packet or we send a reply to the sender. */
872 typedef enum
873 {
878 
879 #define foreach_ethernet_arp_error \
880  _ (replies_sent, "ARP replies sent") \
881  _ (l2_type_not_ethernet, "L2 type not ethernet") \
882  _ (l3_type_not_ip4, "L3 type not IP4") \
883  _ (l3_src_address_not_local, "IP4 source address not local to subnet") \
884  _ (l3_dst_address_not_local, "IP4 destination address not local to subnet") \
885  _ (l3_dst_address_unset, "IP4 destination address is unset") \
886  _ (l3_src_address_is_local, "IP4 source address matches local interface") \
887  _ (l3_src_address_learned, "ARP request IP4 source address learned") \
888  _ (replies_received, "ARP replies received") \
889  _ (opcode_not_request, "ARP opcode not request") \
890  _ (proxy_arp_replies_sent, "Proxy ARP replies sent") \
891  _ (l2_address_mismatch, "ARP hw addr does not match L2 frame src addr") \
892  _ (gratuitous_arp, "ARP probe or announcement dropped") \
893  _ (interface_no_table, "Interface is not mapped to an IP table") \
894  _ (interface_not_ip_enabled, "Interface is not IP enabled") \
895  _ (unnumbered_mismatch, "RX interface is unnumbered to different subnet") \
896 
897 typedef enum
898 {
899 #define _(sym,string) ETHERNET_ARP_ERROR_##sym,
901 #undef _
904 
905 static int
907  u32 input_sw_if_index, u32 conn_sw_if_index)
908 {
909  vnet_main_t *vnm = vnet_get_main ();
912 
913  /* verify that the input interface is unnumbered to the connected.
914  * the connected interface is the interface on which the subnet is
915  * configured */
916  si = &vim->sw_interfaces[input_sw_if_index];
917 
919  (si->unnumbered_sw_if_index == conn_sw_if_index)))
920  {
921  /* the input interface is not unnumbered to the interface on which
922  * the sub-net is configured that covers the ARP request.
923  * So this is not the case for unnumbered.. */
924  return 0;
925  }
926 
927  return !0;
928 }
929 
930 static u32
933  const ethernet_arp_ip4_over_ethernet_address_t * addr)
934 {
935  vnet_arp_set_ip4_over_ethernet (vnm, sw_if_index, addr, 0);
936  return (ETHERNET_ARP_ERROR_l3_src_address_learned);
937 }
938 
939 static uword
941 {
943  vnet_main_t *vnm = vnet_get_main ();
944  ip4_main_t *im4 = &ip4_main;
945  u32 n_left_from, next_index, *from, *to_next;
946  u32 n_replies_sent = 0, n_proxy_arp_replies_sent = 0;
947 
948  from = vlib_frame_vector_args (frame);
949  n_left_from = frame->n_vectors;
950  next_index = node->cached_next_index;
951 
952  if (node->flags & VLIB_NODE_FLAG_TRACE)
953  vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
954  /* stride */ 1,
955  sizeof (ethernet_arp_input_trace_t));
956 
957  while (n_left_from > 0)
958  {
959  u32 n_left_to_next;
960 
961  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
962 
963  while (n_left_from > 0 && n_left_to_next > 0)
964  {
965  vlib_buffer_t *p0;
966  vnet_hw_interface_t *hw_if0;
967  ethernet_arp_header_t *arp0;
968  ethernet_header_t *eth_rx, *eth_tx;
969  const ip4_address_t *if_addr0;
970  ip4_address_t proxy_src;
971  u32 pi0, error0, next0, sw_if_index0, conn_sw_if_index0, fib_index0;
972  u8 is_request0, dst_is_local0, is_unnum0, is_vrrp_reply0;
974  fib_node_index_t dst_fei, src_fei;
975  const fib_prefix_t *pfx0;
976  fib_entry_flag_t src_flags, dst_flags;
977  u8 *rewrite0, rewrite0_len;
978 
979  pi0 = from[0];
980  to_next[0] = pi0;
981  from += 1;
982  to_next += 1;
983  n_left_from -= 1;
984  n_left_to_next -= 1;
985  pa = 0;
986 
987  p0 = vlib_get_buffer (vm, pi0);
988  arp0 = vlib_buffer_get_current (p0);
989  /* Fill in ethernet header. */
990  eth_rx = ethernet_buffer_get_header (p0);
991 
992  is_request0 = arp0->opcode
993  == clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_request);
994 
995  error0 = ETHERNET_ARP_ERROR_replies_sent;
996 
997  error0 =
998  (arp0->l2_type !=
999  clib_net_to_host_u16 (ETHERNET_ARP_HARDWARE_TYPE_ethernet) ?
1000  ETHERNET_ARP_ERROR_l2_type_not_ethernet : error0);
1001  error0 =
1002  (arp0->l3_type !=
1003  clib_net_to_host_u16 (ETHERNET_TYPE_IP4) ?
1004  ETHERNET_ARP_ERROR_l3_type_not_ip4 : error0);
1005  error0 =
1006  (0 == arp0->ip4_over_ethernet[0].ip4.as_u32 ?
1007  ETHERNET_ARP_ERROR_l3_dst_address_unset : error0);
1008 
1009  sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
1010 
1011  /* not playing the ARP game if the interface is not IPv4 enabled */
1012  error0 =
1013  (im4->ip_enabled_by_sw_if_index[sw_if_index0] == 0 ?
1014  ETHERNET_ARP_ERROR_interface_not_ip_enabled : error0);
1015 
1016  if (error0)
1017  goto drop2;
1018 
1019  /* Check that IP address is local and matches incoming interface. */
1020  fib_index0 = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);
1021  if (~0 == fib_index0)
1022  {
1023  error0 = ETHERNET_ARP_ERROR_interface_no_table;
1024  goto drop2;
1025 
1026  }
1027  dst_fei = ip4_fib_table_lookup (ip4_fib_get (fib_index0),
1028  &arp0->ip4_over_ethernet[1].ip4,
1029  32);
1030  dst_flags = fib_entry_get_flags (dst_fei);
1031 
1032  conn_sw_if_index0 = fib_entry_get_resolving_interface (dst_fei);
1033 
1034  /* Honor unnumbered interface, if any */
1035  is_unnum0 = sw_if_index0 != conn_sw_if_index0;
1036 
1037  {
1038  /*
1039  * we're looking for FIB entries that indicate the source
1040  * is attached. There may be more specific non-attached
1041  * routes that match the source, but these do not influence
1042  * whether we respond to an ARP request, i.e. they do not
1043  * influence whether we are the correct way for the sender
1044  * to reach us, they only affect how we reach the sender.
1045  */
1046  fib_entry_t *src_fib_entry;
1047  const fib_prefix_t *pfx;
1049  fib_source_t source;
1050  int attached;
1051  int mask;
1052 
1053  mask = 32;
1054  attached = 0;
1055 
1056  do
1057  {
1058  src_fei = ip4_fib_table_lookup (ip4_fib_get (fib_index0),
1059  &arp0->
1060  ip4_over_ethernet[0].ip4,
1061  mask);
1062  src_fib_entry = fib_entry_get (src_fei);
1063 
1064  /*
1065  * It's possible that the source that provides the
1066  * flags we need, or the flags we must not have,
1067  * is not the best source, so check then all.
1068  */
1069  /* *INDENT-OFF* */
1070  FOR_EACH_SRC_ADDED(src_fib_entry, src, source,
1071  ({
1072  src_flags = fib_entry_get_flags_for_source (src_fei, source);
1073 
1074  /* Reject requests/replies with our local interface
1075  address. */
1076  if (FIB_ENTRY_FLAG_LOCAL & src_flags)
1077  {
1078  error0 = ETHERNET_ARP_ERROR_l3_src_address_is_local;
1079  /*
1080  * When VPP has an interface whose address is also
1081  * applied to a TAP interface on the host, then VPP's
1082  * TAP interface will be unnumbered to the 'real'
1083  * interface and do proxy ARP from the host.
1084  * The curious aspect of this setup is that ARP requests
1085  * from the host will come from the VPP's own address.
1086  * So don't drop immediately here, instead go see if this
1087  * is a proxy ARP case.
1088  */
1089  goto drop1;
1090  }
1091  /* A Source must also be local to subnet of matching
1092  * interface address. */
1093  if ((FIB_ENTRY_FLAG_ATTACHED & src_flags) ||
1094  (FIB_ENTRY_FLAG_CONNECTED & src_flags))
1095  {
1096  attached = 1;
1097  break;
1098  }
1099  /*
1100  * else
1101  * The packet was sent from an address that is not
1102  * connected nor attached i.e. it is not from an
1103  * address that is covered by a link's sub-net,
1104  * nor is it a already learned host resp.
1105  */
1106  }));
1107  /* *INDENT-ON* */
1108 
1109  /*
1110  * shorter mask lookup for the next iteration.
1111  */
1112  pfx = fib_entry_get_prefix (src_fei);
1113  mask = pfx->fp_len - 1;
1114 
1115  /*
1116  * continue until we hit the default route or we find
1117  * the attached we are looking for. The most likely
1118  * outcome is we find the attached with the first source
1119  * on the first lookup.
1120  */
1121  }
1122  while (!attached &&
1124 
1125  if (!attached)
1126  {
1127  /*
1128  * the matching route is a not attached, i.e. it was
1129  * added as a result of routing, rather than interface/ARP
1130  * configuration. If the matching route is not a host route
1131  * (i.e. a /32)
1132  */
1133  error0 = ETHERNET_ARP_ERROR_l3_src_address_not_local;
1134  goto drop2;
1135  }
1136  }
1137 
1138  if (fib_entry_is_sourced (dst_fei, FIB_SOURCE_ADJ))
1139  {
1140  /*
1141  * We matched an adj-fib on ths source subnet (a /32 previously
1142  * added as a result of ARP). If this request is a gratuitous
1143  * ARP, then learn from it.
1144  * The check for matching an adj-fib, is to prevent hosts
1145  * from spamming us with gratuitous ARPS that might otherwise
1146  * blow our ARP cache
1147  */
1148  if (arp0->ip4_over_ethernet[0].ip4.as_u32 ==
1149  arp0->ip4_over_ethernet[1].ip4.as_u32)
1150  error0 = arp_learn (vnm, am, sw_if_index0,
1151  &arp0->ip4_over_ethernet[0]);
1152  goto drop2;
1153  }
1154  else if (!(FIB_ENTRY_FLAG_CONNECTED & dst_flags))
1155  {
1156  error0 = ETHERNET_ARP_ERROR_l3_dst_address_not_local;
1157  goto drop1;
1158  }
1159 
1160  if (sw_if_index0 != fib_entry_get_resolving_interface (src_fei))
1161  {
1162  /*
1163  * The interface the ARP was received on is not the interface
1164  * on which the covering prefix is configured. Maybe this is a
1165  * case for unnumbered.
1166  */
1167  is_unnum0 = 1;
1168  }
1169 
1170  dst_is_local0 = (FIB_ENTRY_FLAG_LOCAL & dst_flags);
1171  pfx0 = fib_entry_get_prefix (dst_fei);
1172  if_addr0 = &pfx0->fp_addr.ip4;
1173 
1174  is_vrrp_reply0 =
1175  ((arp0->opcode ==
1176  clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply))
1177  &&
1178  (!memcmp
1179  (arp0->ip4_over_ethernet[0].mac.bytes, vrrp_prefix,
1180  sizeof (vrrp_prefix))));
1181 
1182  /* Trash ARP packets whose ARP-level source addresses do not
1183  match their L2-frame-level source addresses, unless it's
1184  a reply from a VRRP virtual router */
1186  (eth_rx->src_address,
1187  arp0->ip4_over_ethernet[0].mac.bytes) && !is_vrrp_reply0)
1188  {
1189  error0 = ETHERNET_ARP_ERROR_l2_address_mismatch;
1190  goto drop2;
1191  }
1192 
1193  /* Learn or update sender's mapping only for replies to addresses
1194  * that are local to the subnet */
1195  if (arp0->opcode ==
1196  clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply))
1197  {
1198  if (dst_is_local0)
1199  error0 = arp_learn (vnm, am, sw_if_index0,
1200  &arp0->ip4_over_ethernet[0]);
1201  else
1202  /* a reply for a non-local destination could be a GARP.
1203  * GARPs for hosts we know were handled above, so this one
1204  * we drop */
1205  error0 = ETHERNET_ARP_ERROR_l3_dst_address_not_local;
1206 
1207  goto drop1;
1208  }
1209  else if (arp0->opcode ==
1210  clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_request) &&
1211  (dst_is_local0 == 0))
1212  {
1213  goto drop1;
1214  }
1215 
1216  send_reply:
1217  /* Send a reply.
1218  An adjacency to the sender is not always present,
1219  so we use the interface to build us a rewrite string
1220  which will contain all the necessary tags. */
1221  rewrite0 = ethernet_build_rewrite (vnm, sw_if_index0,
1222  VNET_LINK_ARP,
1223  eth_rx->src_address);
1224  rewrite0_len = vec_len (rewrite0);
1225 
1226  /* Figure out how much to rewind current data from adjacency. */
1227  vlib_buffer_advance (p0, -rewrite0_len);
1228  eth_tx = vlib_buffer_get_current (p0);
1229 
1230  vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
1231  hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
1232 
1233  /* Send reply back through input interface */
1234  vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
1235  next0 = ARP_INPUT_NEXT_REPLY_TX;
1236 
1237  arp0->opcode = clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply);
1238 
1239  arp0->ip4_over_ethernet[1] = arp0->ip4_over_ethernet[0];
1240 
1242  hw_if0->hw_address);
1243  clib_mem_unaligned (&arp0->ip4_over_ethernet[0].ip4.data_u32, u32) =
1244  if_addr0->data_u32;
1245 
1246  /* Hardware must be ethernet-like. */
1247  ASSERT (vec_len (hw_if0->hw_address) == 6);
1248 
1249  /* the rx nd tx ethernet headers wil overlap in the case
1250  * when we received a tagged VLAN=0 packet, but we are sending
1251  * back untagged */
1252  clib_memcpy_fast (eth_tx, rewrite0, vec_len (rewrite0));
1253  vec_free (rewrite0);
1254 
1255  if (NULL == pa)
1256  {
1257  if (is_unnum0)
1258  {
1259  if (!arp_unnumbered (p0, sw_if_index0, conn_sw_if_index0))
1260  {
1261  error0 = ETHERNET_ARP_ERROR_unnumbered_mismatch;
1262  goto drop2;
1263  }
1264  }
1265  }
1266 
1267  /* We are going to reply to this request, so, in the absence of
1268  errors, learn the sender */
1269  if (!error0)
1270  error0 = arp_learn (vnm, am, sw_if_index0,
1271  &arp0->ip4_over_ethernet[1]);
1272 
1273  vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1274  n_left_to_next, pi0, next0);
1275 
1276  n_replies_sent += 1;
1277  continue;
1278 
1279  drop1:
1280  if (arp0->ip4_over_ethernet[0].ip4.as_u32 ==
1281  arp0->ip4_over_ethernet[1].ip4.as_u32)
1282  {
1283  error0 = ETHERNET_ARP_ERROR_gratuitous_arp;
1284  goto drop2;
1285  }
1286  /* See if proxy arp is configured for the address */
1287  if (is_request0)
1288  {
1289  vnet_sw_interface_t *si;
1290  u32 this_addr = clib_net_to_host_u32
1291  (arp0->ip4_over_ethernet[1].ip4.as_u32);
1292  u32 fib_index0;
1293 
1294  si = vnet_get_sw_interface (vnm, sw_if_index0);
1295 
1297  goto drop2;
1298 
1299  fib_index0 = vec_elt (im4->fib_index_by_sw_if_index,
1300  sw_if_index0);
1301 
1302  vec_foreach (pa, am->proxy_arps)
1303  {
1304  u32 lo_addr = clib_net_to_host_u32 (pa->lo_addr.as_u32);
1305  u32 hi_addr = clib_net_to_host_u32 (pa->hi_addr.as_u32);
1306 
1307  /* an ARP request hit in the proxy-arp table? */
1308  if ((this_addr >= lo_addr && this_addr <= hi_addr) &&
1309  (fib_index0 == pa->fib_index))
1310  {
1311  proxy_src.as_u32 =
1312  arp0->ip4_over_ethernet[1].ip4.data_u32;
1313 
1314  /*
1315  * change the interface address to the proxied
1316  */
1317  if_addr0 = &proxy_src;
1318  is_unnum0 = 0;
1319  n_proxy_arp_replies_sent++;
1320  goto send_reply;
1321  }
1322  }
1323  }
1324 
1325  drop2:
1326 
1327  next0 = ARP_INPUT_NEXT_DROP;
1328  p0->error = node->errors[error0];
1329 
1330  vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1331  n_left_to_next, pi0, next0);
1332  }
1333 
1334  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1335  }
1336 
1337  vlib_error_count (vm, node->node_index,
1338  ETHERNET_ARP_ERROR_replies_sent,
1339  n_replies_sent - n_proxy_arp_replies_sent);
1340 
1341  vlib_error_count (vm, node->node_index,
1342  ETHERNET_ARP_ERROR_proxy_arp_replies_sent,
1343  n_proxy_arp_replies_sent);
1344  return frame->n_vectors;
1345 }
1346 
1347 static char *ethernet_arp_error_strings[] = {
1348 #define _(sym,string) string,
1350 #undef _
1351 };
1352 
1353 /* *INDENT-OFF* */
1355 {
1356  .function = arp_input,
1357  .name = "arp-input",
1358  .vector_size = sizeof (u32),
1359  .n_errors = ETHERNET_ARP_N_ERROR,
1360  .error_strings = ethernet_arp_error_strings,
1361  .n_next_nodes = ARP_INPUT_N_NEXT,
1362  .next_nodes = {
1363  [ARP_INPUT_NEXT_DROP] = "error-drop",
1364  [ARP_INPUT_NEXT_REPLY_TX] = "interface-output",
1365  },
1366  .format_buffer = format_ethernet_arp_header,
1367  .format_trace = format_ethernet_arp_input_trace,
1368 };
1369 /* *INDENT-ON* */
1370 
1371 static int
1372 ip4_arp_entry_sort (void *a1, void *a2)
1373 {
1374  ethernet_arp_ip4_entry_t *e1 = a1;
1375  ethernet_arp_ip4_entry_t *e2 = a2;
1376 
1377  int cmp;
1378  vnet_main_t *vnm = vnet_get_main ();
1379 
1380  cmp = vnet_sw_interface_compare (vnm, e1->sw_if_index, e2->sw_if_index);
1381  if (!cmp)
1382  cmp = ip4_address_compare (&e1->ip4_address, &e2->ip4_address);
1383  return cmp;
1384 }
1385 
1388 {
1390  return am->ip4_entry_pool;
1391 }
1392 
1395 {
1397  ethernet_arp_ip4_entry_t *n, *ns = 0;
1398 
1399  /* *INDENT-OFF* */
1400  pool_foreach (n, am->ip4_entry_pool, ({
1401  if (sw_if_index != ~0 && n->sw_if_index != sw_if_index)
1402  continue;
1403  vec_add1 (ns, n[0]);
1404  }));
1405  /* *INDENT-ON* */
1406 
1407  if (ns)
1409  return ns;
1410 }
1411 
1412 static clib_error_t *
1414  unformat_input_t * input, vlib_cli_command_t * cmd)
1415 {
1416  vnet_main_t *vnm = vnet_get_main ();
1418  ethernet_arp_ip4_entry_t *e, *es;
1420  clib_error_t *error = 0;
1421  u32 sw_if_index;
1422 
1423  /* Filter entries by interface if given. */
1424  sw_if_index = ~0;
1425  (void) unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index);
1426 
1427  es = ip4_neighbor_entries (sw_if_index);
1428  if (es)
1429  {
1430  vlib_cli_output (vm, "%U", format_ethernet_arp_ip4_entry, vnm, 0);
1431  vec_foreach (e, es)
1432  {
1433  vlib_cli_output (vm, "%U", format_ethernet_arp_ip4_entry, vnm, e);
1434  }
1435  vec_free (es);
1436  }
1437 
1438  if (vec_len (am->proxy_arps))
1439  {
1440  vlib_cli_output (vm, "Proxy arps enabled for:");
1441  vec_foreach (pa, am->proxy_arps)
1442  {
1443  vlib_cli_output (vm, "Fib_index %d %U - %U ",
1444  pa->fib_index,
1446  format_ip4_address, &pa->hi_addr);
1447  }
1448  }
1449 
1450  return error;
1451 }
1452 
1453 /*?
1454  * Display all the IPv4 ARP entries.
1455  *
1456  * @cliexpar
1457  * Example of how to display the IPv4 ARP table:
1458  * @cliexstart{show ip arp}
1459  * Time FIB IP4 Flags Ethernet Interface
1460  * 346.3028 0 6.1.1.3 de:ad:be:ef:ba:be GigabitEthernet2/0/0
1461  * 3077.4271 0 6.1.1.4 S de:ad:be:ef:ff:ff GigabitEthernet2/0/0
1462  * 2998.6409 1 6.2.2.3 de:ad:be:ef:00:01 GigabitEthernet2/0/0
1463  * Proxy arps enabled for:
1464  * Fib_index 0 6.0.0.1 - 6.0.0.11
1465  * @cliexend
1466  ?*/
1467 /* *INDENT-OFF* */
1468 VLIB_CLI_COMMAND (show_ip4_arp_command, static) = {
1469  .path = "show ip arp",
1470  .function = show_ip4_arp,
1471  .short_help = "show ip arp",
1472 };
1473 /* *INDENT-ON* */
1474 
1475 typedef struct
1476 {
1477  pg_edit_t l2_type, l3_type;
1478  pg_edit_t n_l2_address_bytes, n_l3_address_bytes;
1480  struct
1481  {
1484  } ip4_over_ethernet[2];
1486 
1487 static inline void
1489 {
1490  /* Initialize fields that are not bit fields in the IP header. */
1491 #define _(f) pg_edit_init (&p->f, ethernet_arp_header_t, f);
1492  _(l2_type);
1493  _(l3_type);
1494  _(n_l2_address_bytes);
1495  _(n_l3_address_bytes);
1496  _(opcode);
1497  _(ip4_over_ethernet[0].mac);
1498  _(ip4_over_ethernet[0].ip4);
1499  _(ip4_over_ethernet[1].mac);
1500  _(ip4_over_ethernet[1].ip4);
1501 #undef _
1502 }
1503 
1504 uword
1505 unformat_pg_arp_header (unformat_input_t * input, va_list * args)
1506 {
1507  pg_stream_t *s = va_arg (*args, pg_stream_t *);
1509  u32 group_index;
1510 
1511  p = pg_create_edit_group (s, sizeof (p[0]), sizeof (ethernet_arp_header_t),
1512  &group_index);
1514 
1515  /* Defaults. */
1516  pg_edit_set_fixed (&p->l2_type, ETHERNET_ARP_HARDWARE_TYPE_ethernet);
1517  pg_edit_set_fixed (&p->l3_type, ETHERNET_TYPE_IP4);
1520 
1521  if (!unformat (input, "%U: %U/%U -> %U/%U",
1532  {
1533  /* Free up any edits we may have added. */
1534  pg_free_edit_group (s);
1535  return 0;
1536  }
1537  return 1;
1538 }
1539 
1540 clib_error_t *
1542 {
1544 
1545  am->limit_arp_cache_size = arp_limit;
1546  return 0;
1547 }
1548 
1549 /**
1550  * @brief Control Plane hook to remove an ARP entry
1551  */
1552 int
1554  u32 sw_if_index,
1555  const
1556  ethernet_arp_ip4_over_ethernet_address_t *
1557  a)
1558 {
1561  .flags = ETHERNET_ARP_ARGS_REMOVE,
1562  .ip4 = a->ip4,
1563  .mac = a->mac,
1564  };
1565 
1567  (u8 *) & args, sizeof (args));
1568  return 0;
1569 }
1570 
1571 /**
1572  * @brief publish wildcard arp event
1573  * @param sw_if_index The interface on which the ARP entries are acted
1574  */
1575 static int
1577  const ethernet_arp_ip4_over_ethernet_address_t * a)
1578 {
1581  .sw_if_index = sw_if_index,
1582  .ip4 = a->ip4,
1583  .mac = a->mac,
1584  };
1585 
1587  (u8 *) & args, sizeof (args));
1588  return 0;
1589 }
1590 
1591 static void
1594  args)
1595 {
1599  uword et = am->wc_ip4_arp_publisher_et;
1600 
1601  if (ni == (uword) ~ 0)
1602  return;
1603  wc_arp_report_t *r =
1604  vlib_process_signal_event_data (vm, ni, et, 1, sizeof *r);
1605  r->ip.as_u32 = args->ip4.as_u32;
1606  r->sw_if_index = args->sw_if_index;
1607  mac_address_copy (&r->mac, &args->mac);
1608 }
1609 
1610 void
1611 wc_arp_set_publisher_node (uword node_index, uword event_type)
1612 {
1614  am->wc_ip4_arp_publisher_node = node_index;
1615  am->wc_ip4_arp_publisher_et = event_type;
1616 }
1617 
1618 static void
1620 
1621 static int
1624  * args)
1625 {
1629 
1630  if (vec_len (am->ethernet_arp_by_sw_if_index) <= args->sw_if_index)
1631  return 0;
1632 
1633  eai = &am->ethernet_arp_by_sw_if_index[args->sw_if_index];
1634 
1635  e = arp_entry_find (eai, &args->ip4);
1636 
1637  if (NULL != e)
1638  {
1641 
1642  /*
1643  * The difference between flush and unset, is that an unset
1644  * means delete for static and dynamic entries. A flush
1645  * means delete only for dynamic. Flushing is what the DP
1646  * does in response to interface events. unset is only done
1647  * by the control plane.
1648  */
1649  if (e->flags & IP_NEIGHBOR_FLAG_STATIC)
1650  {
1652  }
1653  else if (e->flags & IP_NEIGHBOR_FLAG_DYNAMIC)
1654  {
1655  arp_entry_free (eai, e);
1656  }
1657  }
1658  return (0);
1659 }
1660 
1661 /*
1662  * arp_add_del_interface_address
1663  *
1664  * callback when an interface address is added or deleted
1665  */
1666 static void
1668  uword opaque,
1669  u32 sw_if_index,
1672  u32 if_address_index, u32 is_del)
1673 {
1674  /*
1675  * Flush the ARP cache of all entries covered by the address
1676  * that is being removed.
1677  */
1680 
1681  if (vec_len (am->ethernet_arp_by_sw_if_index) <= sw_if_index)
1682  return;
1683 
1684  if (is_del)
1685  {
1687  u32 i, *to_delete = 0;
1688  hash_pair_t *pair;
1689 
1691 
1692  /* *INDENT-OFF* */
1693  hash_foreach_pair (pair, eai->arp_entries,
1694  ({
1695  e = pool_elt_at_index(am->ip4_entry_pool,
1696  pair->value[0]);
1697  if (ip4_destination_matches_route (im, &e->ip4_address,
1698  address, address_length))
1699  {
1700  vec_add1 (to_delete, e - am->ip4_entry_pool);
1701  }
1702  }));
1703  /* *INDENT-ON* */
1704 
1705  for (i = 0; i < vec_len (to_delete); i++)
1706  {
1707  e = pool_elt_at_index (am->ip4_entry_pool, to_delete[i]);
1708 
1710  .ip4.as_u32 = e->ip4_address.as_u32,
1711  .sw_if_index = e->sw_if_index,
1712  .flags = ETHERNET_ARP_ARGS_FLUSH,
1713  };
1714  mac_address_copy (&delme.mac, &e->mac);
1715 
1717  &delme);
1718  }
1719 
1720  vec_free (to_delete);
1721  }
1722 }
1723 
1724 static void
1726  uword opaque,
1727  u32 sw_if_index, u32 new_fib_index, u32 old_fib_index)
1728 {
1732  hash_pair_t *pair;
1733 
1734  /*
1735  * the IP table that the interface is bound to has changed.
1736  * reinstall all the adj fibs.
1737  */
1738 
1739  if (vec_len (am->ethernet_arp_by_sw_if_index) <= sw_if_index)
1740  return;
1741 
1743 
1744  /* *INDENT-OFF* */
1745  hash_foreach_pair (pair, eai->arp_entries,
1746  ({
1747  e = pool_elt_at_index(am->ip4_entry_pool,
1748  pair->value[0]);
1749  /*
1750  * remove the adj-fib from the old table and add to the new
1751  */
1752  arp_adj_fib_remove(e, old_fib_index);
1753  arp_adj_fib_add(e, new_fib_index);
1754  }));
1755  /* *INDENT-ON* */
1756 
1757 }
1758 
1759 static clib_error_t *
1761 {
1763  ip4_main_t *im = &ip4_main;
1764  clib_error_t *error;
1765  pg_node_t *pn;
1766 
1767  if ((error = vlib_call_init_function (vm, ethernet_init)))
1768  return error;
1769 
1770  ethernet_register_input_type (vm, ETHERNET_TYPE_ARP, arp_input_node.index);
1771 
1772  pn = pg_get_node (arp_input_node.index);
1774 
1775  am->opcode_by_name = hash_create_string (0, sizeof (uword));
1776 #define _(o) hash_set_mem (am->opcode_by_name, #o, ETHERNET_ARP_OPCODE_##o);
1778 #undef _
1779 
1780  /* $$$ configurable */
1781  am->limit_arp_cache_size = 50000;
1782 
1783  am->pending_resolutions_by_address = hash_create (0, sizeof (uword));
1784  am->mac_changes_by_address = hash_create (0, sizeof (uword));
1785  am->wc_ip4_arp_publisher_node = (uword) ~ 0;
1786 
1787  /* don't trace ARP error packets */
1788  {
1789  vlib_node_runtime_t *rt =
1791 
1792 #define _(a,b) \
1793  vnet_pcap_drop_trace_filter_add_del \
1794  (rt->errors[ETHERNET_ARP_ERROR_##a], \
1795  1 /* is_add */);
1797 #undef _
1798  }
1799 
1802  cb.function_opaque = 0;
1804 
1806  cbt.function = arp_table_bind;
1807  cbt.function_opaque = 0;
1808  vec_add1 (im->table_bind_callbacks, cbt);
1809 
1810  return 0;
1811 }
1812 
1814 
1815 static void
1817 {
1819 
1823  pool_put (am->ip4_entry_pool, e);
1824 }
1825 
1826 static inline int
1829  * args)
1830 {
1834 
1835  if (vec_len (am->ethernet_arp_by_sw_if_index) <= args->sw_if_index)
1836  return 0;
1837 
1838  eai = &am->ethernet_arp_by_sw_if_index[args->sw_if_index];
1839 
1840  e = arp_entry_find (eai, &args->ip4);
1841 
1842  if (NULL != e)
1843  {
1846  arp_entry_free (eai, e);
1847  }
1848 
1849  return 0;
1850 }
1851 
1852 
1853 static int
1856  * args)
1857 {
1861 
1863  eai = &am->ethernet_arp_by_sw_if_index[args->sw_if_index];
1864 
1865  e = arp_entry_find (eai, &args->ip4);
1866 
1867  if (NULL != e)
1868  {
1871  }
1872  return (0);
1873 }
1874 
1875 static void
1877  * a)
1878 {
1880  ASSERT (vlib_get_thread_index () == 0);
1881 
1884  else if (a->flags & ETHERNET_ARP_ARGS_FLUSH)
1886  else if (a->flags & ETHERNET_ARP_ARGS_POPULATE)
1888  else if (a->flags & ETHERNET_ARP_ARGS_WC_PUB)
1890  else
1892 }
1893 
1894 /**
1895  * @brief Invoked when the interface's admin state changes
1896  */
1897 static clib_error_t *
1900 {
1903  u32 i, *to_update = 0;
1904 
1905  /* *INDENT-OFF* */
1906  pool_foreach (e, am->ip4_entry_pool,
1907  ({
1908  if (e->sw_if_index == sw_if_index)
1909  vec_add1 (to_update,
1910  e - am->ip4_entry_pool);
1911  }));
1912  /* *INDENT-ON* */
1913 
1914  for (i = 0; i < vec_len (to_update); i++)
1915  {
1916  e = pool_elt_at_index (am->ip4_entry_pool, to_update[i]);
1917 
1919  .ip4.as_u32 = e->ip4_address.as_u32,
1920  .sw_if_index = e->sw_if_index,
1921  };
1922  mac_address_copy (&update_me.mac, &e->mac);
1923 
1924  if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
1925  {
1926  update_me.flags = ETHERNET_ARP_ARGS_POPULATE;
1928  }
1929  else
1930  {
1931  update_me.flags = ETHERNET_ARP_ARGS_FLUSH;
1933  }
1934  }
1935  vec_free (to_update);
1936 
1937  return 0;
1938 }
1939 
1941 
1942 static void
1943 increment_ip4_and_mac_address (ethernet_arp_ip4_over_ethernet_address_t * a)
1944 {
1945  u8 old;
1946  int i;
1947 
1948  for (i = 3; i >= 0; i--)
1949  {
1950  old = a->ip4.as_u8[i];
1951  a->ip4.as_u8[i] += 1;
1952  if (old < a->ip4.as_u8[i])
1953  break;
1954  }
1955 
1956  for (i = 5; i >= 0; i--)
1957  {
1958  old = a->mac.bytes[i];
1959  a->mac.bytes[i] += 1;
1960  if (old < a->mac.bytes[i])
1961  break;
1962  }
1963 }
1964 
1965 int
1967  u32 sw_if_index,
1968  const ethernet_arp_ip4_over_ethernet_address_t
1970 {
1973  .nbr_flags = flags,
1974  .flags = 0,
1975  .ip4.as_u32 = a->ip4.as_u32,
1976  .mac = a->mac,
1977  };
1978 
1980  (u8 *) & args, sizeof (args));
1981  return 0;
1982 }
1983 
1984 void
1986 {
1989 
1990  vec_foreach (pa, am->proxy_arps)
1991  {
1992  if (!cb (&pa->lo_addr, &pa->hi_addr, pa->fib_index, data))
1993  break;
1994  }
1995 }
1996 
1997 int
1999  ip4_address_t * hi_addr, u32 fib_index, int is_del)
2000 {
2003  u32 found_at_index = ~0;
2004 
2005  vec_foreach (pa, am->proxy_arps)
2006  {
2007  if (pa->lo_addr.as_u32 == lo_addr->as_u32 &&
2008  pa->hi_addr.as_u32 == hi_addr->as_u32 && pa->fib_index == fib_index)
2009  {
2010  found_at_index = pa - am->proxy_arps;
2011  break;
2012  }
2013  }
2014 
2015  if (found_at_index != ~0)
2016  {
2017  /* Delete, otherwise it's already in the table */
2018  if (is_del)
2019  vec_delete (am->proxy_arps, 1, found_at_index);
2020  return 0;
2021  }
2022  /* delete, no such entry */
2023  if (is_del)
2024  return VNET_API_ERROR_NO_SUCH_ENTRY;
2025 
2026  /* add, not in table */
2027  vec_add2 (am->proxy_arps, pa, 1);
2028  pa->lo_addr.as_u32 = lo_addr->as_u32;
2029  pa->hi_addr.as_u32 = hi_addr->as_u32;
2030  pa->fib_index = fib_index;
2031  return 0;
2032 }
2033 
2034 /*
2035  * Remove any proxy arp entries associated with the
2036  * specified fib.
2037  */
2038 int
2040 {
2043  u32 *entries_to_delete = 0;
2044  u32 fib_index;
2045  int i;
2046 
2047  fib_index = fib_table_find (FIB_PROTOCOL_IP4, fib_id);
2048  if (~0 == fib_index)
2049  return VNET_API_ERROR_NO_SUCH_ENTRY;
2050 
2051  vec_foreach (pa, am->proxy_arps)
2052  {
2053  if (pa->fib_index == fib_index)
2054  {
2055  vec_add1 (entries_to_delete, pa - am->proxy_arps);
2056  }
2057  }
2058 
2059  for (i = 0; i < vec_len (entries_to_delete); i++)
2060  {
2061  vec_delete (am->proxy_arps, 1, entries_to_delete[i]);
2062  }
2063 
2064  vec_free (entries_to_delete);
2065 
2066  return 0;
2067 }
2068 
2069 static clib_error_t *
2071  unformat_input_t * input, vlib_cli_command_t * cmd)
2072 {
2073  vnet_main_t *vnm = vnet_get_main ();
2074  u32 sw_if_index;
2075  ethernet_arp_ip4_over_ethernet_address_t lo_addr, hi_addr, addr;
2076  int addr_valid = 0;
2077  int is_del = 0;
2078  int count = 1;
2079  u32 fib_index = 0;
2080  u32 fib_id;
2081  int is_proxy = 0;
2083 
2084  flags = IP_NEIGHBOR_FLAG_NONE;
2085 
2086  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2087  {
2088  /* set ip arp TenGigE1/1/0/1 1.2.3.4 aa:bb:... or aabb.ccdd... */
2089  if (unformat (input, "%U %U %U",
2090  unformat_vnet_sw_interface, vnm, &sw_if_index,
2091  unformat_ip4_address, &addr.ip4,
2092  unformat_mac_address_t, &addr.mac))
2093  addr_valid = 1;
2094 
2095  else if (unformat (input, "delete") || unformat (input, "del"))
2096  is_del = 1;
2097 
2098  else if (unformat (input, "static"))
2099  flags |= IP_NEIGHBOR_FLAG_STATIC;
2100 
2101  else if (unformat (input, "no-fib-entry"))
2103 
2104  else if (unformat (input, "count %d", &count))
2105  ;
2106 
2107  else if (unformat (input, "fib-id %d", &fib_id))
2108  {
2109  fib_index = fib_table_find (FIB_PROTOCOL_IP4, fib_id);
2110 
2111  if (~0 == fib_index)
2112  return clib_error_return (0, "fib ID %d doesn't exist\n", fib_id);
2113  }
2114 
2115  else if (unformat (input, "proxy %U - %U",
2116  unformat_ip4_address, &lo_addr.ip4,
2117  unformat_ip4_address, &hi_addr.ip4))
2118  is_proxy = 1;
2119  else
2120  break;
2121  }
2122 
2123  if (is_proxy)
2124  {
2125  (void) vnet_proxy_arp_add_del (&lo_addr.ip4, &hi_addr.ip4,
2126  fib_index, is_del);
2127  return 0;
2128  }
2129 
2130  if (addr_valid)
2131  {
2132  int i;
2133 
2134  for (i = 0; i < count; i++)
2135  {
2136  if (is_del == 0)
2137  {
2138  uword event_type, *event_data = 0;
2139 
2140  /* Park the debug CLI until the arp entry is installed */
2142  (vnm, &addr.ip4, vlib_current_process (vm),
2143  1 /* type */ , 0 /* data */ );
2144 
2145  vnet_arp_set_ip4_over_ethernet (vnm, sw_if_index, &addr, flags);
2146 
2148  event_type = vlib_process_get_events (vm, &event_data);
2149  vec_reset_length (event_data);
2150  if (event_type != 1)
2151  clib_warning ("event type %d unexpected", event_type);
2152  }
2153  else
2154  vnet_arp_unset_ip4_over_ethernet (vnm, sw_if_index, &addr);
2155 
2157  }
2158  }
2159  else
2160  {
2161  return clib_error_return (0, "unknown input `%U'",
2162  format_unformat_error, input);
2163  }
2164 
2165  return 0;
2166 }
2167 
2168 /* *INDENT-OFF* */
2169 /*?
2170  * Add or delete IPv4 ARP cache entries.
2171  *
2172  * @note 'set ip arp' options (e.g. delete, static, 'fib-id <id>',
2173  * 'count <number>', 'interface ip4_addr mac_addr') can be added in
2174  * any order and combination.
2175  *
2176  * @cliexpar
2177  * @parblock
2178  * Add or delete IPv4 ARP cache entries as follows. MAC Address can be in
2179  * either aa:bb:cc:dd:ee:ff format or aabb.ccdd.eeff format.
2180  * @cliexcmd{set ip arp GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2181  * @cliexcmd{set ip arp delete GigabitEthernet2/0/0 6.0.0.3 de:ad:be:ef:ba:be}
2182  *
2183  * To add or delete an IPv4 ARP cache entry to or from a specific fib
2184  * table:
2185  * @cliexcmd{set ip arp fib-id 1 GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2186  * @cliexcmd{set ip arp fib-id 1 delete GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2187  *
2188  * Add or delete IPv4 static ARP cache entries as follows:
2189  * @cliexcmd{set ip arp static GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2190  * @cliexcmd{set ip arp static delete GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2191  *
2192  * For testing / debugging purposes, the 'set ip arp' command can add or
2193  * delete multiple entries. Supply the 'count N' parameter:
2194  * @cliexcmd{set ip arp count 10 GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2195  * @endparblock
2196  ?*/
2197 VLIB_CLI_COMMAND (ip_arp_add_del_command, static) = {
2198  .path = "set ip arp",
2199  .short_help =
2200  "set ip arp [del] <intfc> <ip-address> <mac-address> [static] [no-fib-entry] [count <count>] [fib-id <fib-id>] [proxy <lo-addr> - <hi-addr>]",
2201  .function = ip_arp_add_del_command_fn,
2202 };
2203 /* *INDENT-ON* */
2204 
2205 static clib_error_t *
2208  input, vlib_cli_command_t * cmd)
2209 {
2210  vnet_main_t *vnm = vnet_get_main ();
2211  u32 sw_if_index;
2212  vnet_sw_interface_t *si;
2213  int enable = 0;
2214  int intfc_set = 0;
2215 
2216  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2217  {
2218  if (unformat (input, "%U", unformat_vnet_sw_interface,
2219  vnm, &sw_if_index))
2220  intfc_set = 1;
2221  else if (unformat (input, "enable") || unformat (input, "on"))
2222  enable = 1;
2223  else if (unformat (input, "disable") || unformat (input, "off"))
2224  enable = 0;
2225  else
2226  break;
2227  }
2228 
2229  if (intfc_set == 0)
2230  return clib_error_return (0, "unknown input '%U'",
2231  format_unformat_error, input);
2232 
2233  si = vnet_get_sw_interface (vnm, sw_if_index);
2234  ASSERT (si);
2235  if (enable)
2237  else
2239 
2240  return 0;
2241 }
2242 
2243 /* *INDENT-OFF* */
2244 /*?
2245  * Enable proxy-arp on an interface. The vpp stack will answer ARP
2246  * requests for the indicated address range. Multiple proxy-arp
2247  * ranges may be provisioned.
2248  *
2249  * @note Proxy ARP as a technology is infamous for blackholing traffic.
2250  * Also, the underlying implementation has not been performance-tuned.
2251  * Avoid creating an unnecessarily large set of ranges.
2252  *
2253  * @cliexpar
2254  * To enable proxy arp on a range of addresses, use:
2255  * @cliexcmd{set ip arp proxy 6.0.0.1 - 6.0.0.11}
2256  * Append 'del' to delete a range of proxy ARP addresses:
2257  * @cliexcmd{set ip arp proxy 6.0.0.1 - 6.0.0.11 del}
2258  * You must then specifically enable proxy arp on individual interfaces:
2259  * @cliexcmd{set interface proxy-arp GigabitEthernet0/8/0 enable}
2260  * To disable proxy arp on an individual interface:
2261  * @cliexcmd{set interface proxy-arp GigabitEthernet0/8/0 disable}
2262  ?*/
2263 VLIB_CLI_COMMAND (set_int_proxy_enable_command, static) = {
2264  .path = "set interface proxy-arp",
2265  .short_help =
2266  "set interface proxy-arp <intfc> [enable|disable]",
2267  .function = set_int_proxy_arp_command_fn,
2268 };
2269 /* *INDENT-ON* */
2270 
2271 
2272 /*
2273  * ARP/ND Termination in a L2 Bridge Domain based on IP4/IP6 to MAC
2274  * hash tables mac_by_ip4 and mac_by_ip6 for each BD.
2275  */
2276 typedef enum
2277 {
2281 } arp_term_next_t;
2282 
2284 
2285 static uword
2287  vlib_node_runtime_t * node, vlib_frame_t * frame)
2288 {
2289  l2input_main_t *l2im = &l2input_main;
2290  u32 n_left_from, next_index, *from, *to_next;
2291  u32 n_replies_sent = 0;
2292  u16 last_bd_index = ~0;
2293  l2_bridge_domain_t *last_bd_config = 0;
2294  l2_input_config_t *cfg0;
2295 
2296  from = vlib_frame_vector_args (frame);
2297  n_left_from = frame->n_vectors;
2298  next_index = node->cached_next_index;
2299 
2300  while (n_left_from > 0)
2301  {
2302  u32 n_left_to_next;
2303 
2304  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2305 
2306  while (n_left_from > 0 && n_left_to_next > 0)
2307  {
2308  vlib_buffer_t *p0;
2309  ethernet_header_t *eth0;
2310  ethernet_arp_header_t *arp0;
2311  ip6_header_t *iph0;
2312  u8 *l3h0;
2313  u32 pi0, error0, next0, sw_if_index0;
2314  u16 ethertype0;
2315  u16 bd_index0;
2316  u32 ip0;
2317  u8 *macp0;
2318 
2319  pi0 = from[0];
2320  to_next[0] = pi0;
2321  from += 1;
2322  to_next += 1;
2323  n_left_from -= 1;
2324  n_left_to_next -= 1;
2325 
2326  p0 = vlib_get_buffer (vm, pi0);
2327  // Terminate only local (SHG == 0) ARP
2328  if (vnet_buffer (p0)->l2.shg != 0)
2329  goto next_l2_feature;
2330 
2331  eth0 = vlib_buffer_get_current (p0);
2332  l3h0 = (u8 *) eth0 + vnet_buffer (p0)->l2.l2_len;
2333  ethertype0 = clib_net_to_host_u16 (*(u16 *) (l3h0 - 2));
2334  arp0 = (ethernet_arp_header_t *) l3h0;
2335 
2336  if (ethertype0 != ETHERNET_TYPE_ARP)
2337  goto check_ip6_nd;
2338 
2339  if ((arp0->opcode !=
2340  clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_request)) &&
2341  (arp0->opcode !=
2342  clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply)))
2343  goto check_ip6_nd;
2344 
2345  /* Must be ARP request/reply packet here */
2346  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) &&
2347  (p0->flags & VLIB_BUFFER_IS_TRACED)))
2348  {
2349  u8 *t0 = vlib_add_trace (vm, node, p0,
2350  sizeof (ethernet_arp_input_trace_t));
2351  clib_memcpy_fast (t0, l3h0,
2352  sizeof (ethernet_arp_input_trace_t));
2353  }
2354 
2355  error0 = 0;
2356  error0 =
2357  (arp0->l2_type !=
2358  clib_net_to_host_u16 (ETHERNET_ARP_HARDWARE_TYPE_ethernet)
2359  ? ETHERNET_ARP_ERROR_l2_type_not_ethernet : error0);
2360  error0 =
2361  (arp0->l3_type !=
2362  clib_net_to_host_u16 (ETHERNET_TYPE_IP4) ?
2363  ETHERNET_ARP_ERROR_l3_type_not_ip4 : error0);
2364 
2365  sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
2366 
2367  if (error0)
2368  goto drop;
2369 
2370  /* Trash ARP packets whose ARP-level source addresses do not
2371  match, or if requester address is mcast */
2372  if (PREDICT_FALSE
2374  arp0->ip4_over_ethernet[0].
2375  mac.bytes))
2376  || ethernet_address_cast (arp0->ip4_over_ethernet[0].mac.bytes))
2377  {
2378  /* VRRP virtual MAC may be different to SMAC in ARP reply */
2380  (arp0->ip4_over_ethernet[0].mac.bytes, vrrp_prefix))
2381  {
2382  error0 = ETHERNET_ARP_ERROR_l2_address_mismatch;
2383  goto drop;
2384  }
2385  }
2386  if (PREDICT_FALSE
2387  (ip4_address_is_multicast (&arp0->ip4_over_ethernet[0].ip4)))
2388  {
2389  error0 = ETHERNET_ARP_ERROR_l3_src_address_not_local;
2390  goto drop;
2391  }
2392 
2393  /* Check if anyone want ARP request events for L2 BDs */
2394  {
2396  if (am->wc_ip4_arp_publisher_node != (uword) ~ 0)
2397  vnet_arp_wc_publish (sw_if_index0, &arp0->ip4_over_ethernet[0]);
2398  }
2399 
2400  /* lookup BD mac_by_ip4 hash table for MAC entry */
2401  ip0 = arp0->ip4_over_ethernet[1].ip4.as_u32;
2402  bd_index0 = vnet_buffer (p0)->l2.bd_index;
2403  if (PREDICT_FALSE ((bd_index0 != last_bd_index)
2404  || (last_bd_index == (u16) ~ 0)))
2405  {
2406  last_bd_index = bd_index0;
2407  last_bd_config = vec_elt_at_index (l2im->bd_configs, bd_index0);
2408  }
2409  macp0 = (u8 *) hash_get (last_bd_config->mac_by_ip4, ip0);
2410 
2411  if (PREDICT_FALSE (!macp0))
2412  goto next_l2_feature; /* MAC not found */
2413  if (PREDICT_FALSE (arp0->ip4_over_ethernet[0].ip4.as_u32 ==
2414  arp0->ip4_over_ethernet[1].ip4.as_u32))
2415  goto next_l2_feature; /* GARP */
2416 
2417  /* MAC found, send ARP reply -
2418  Convert ARP request packet to ARP reply */
2419  arp0->opcode = clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply);
2420  arp0->ip4_over_ethernet[1] = arp0->ip4_over_ethernet[0];
2421  arp0->ip4_over_ethernet[0].ip4.as_u32 = ip0;
2422  mac_address_from_bytes (&arp0->ip4_over_ethernet[0].mac, macp0);
2423  clib_memcpy_fast (eth0->dst_address, eth0->src_address, 6);
2424  clib_memcpy_fast (eth0->src_address, macp0, 6);
2425  n_replies_sent += 1;
2426 
2427  output_response:
2428  /* For BVI, need to use l2-fwd node to send ARP reply as
2429  l2-output node cannot output packet to BVI properly */
2430  cfg0 = vec_elt_at_index (l2im->configs, sw_if_index0);
2431  if (PREDICT_FALSE (cfg0->bvi))
2432  {
2433  vnet_buffer (p0)->l2.feature_bitmap |= L2INPUT_FEAT_FWD;
2434  vnet_buffer (p0)->sw_if_index[VLIB_RX] = 0;
2435  goto next_l2_feature;
2436  }
2437 
2438  /* Send ARP/ND reply back out input interface through l2-output */
2439  vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
2440  next0 = ARP_TERM_NEXT_L2_OUTPUT;
2441  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2442  to_next, n_left_to_next, pi0,
2443  next0);
2444  continue;
2445 
2446  check_ip6_nd:
2447  /* IP6 ND event notification or solicitation handling to generate
2448  local response instead of flooding */
2449  iph0 = (ip6_header_t *) l3h0;
2450  if (PREDICT_FALSE (ethertype0 == ETHERNET_TYPE_IP6 &&
2451  iph0->protocol == IP_PROTOCOL_ICMP6 &&
2453  (&iph0->src_address)))
2454  {
2455  sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
2456  if (vnet_ip6_nd_term
2457  (vm, node, p0, eth0, iph0, sw_if_index0,
2458  vnet_buffer (p0)->l2.bd_index))
2459  goto output_response;
2460  }
2461 
2462  next_l2_feature:
2463  {
2465  L2INPUT_FEAT_ARP_TERM);
2466  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2467  to_next, n_left_to_next,
2468  pi0, next0);
2469  continue;
2470  }
2471 
2472  drop:
2473  if (0 == arp0->ip4_over_ethernet[0].ip4.as_u32 ||
2474  (arp0->ip4_over_ethernet[0].ip4.as_u32 ==
2475  arp0->ip4_over_ethernet[1].ip4.as_u32))
2476  {
2477  error0 = ETHERNET_ARP_ERROR_gratuitous_arp;
2478  }
2479  next0 = ARP_TERM_NEXT_DROP;
2480  p0->error = node->errors[error0];
2481 
2482  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2483  to_next, n_left_to_next, pi0,
2484  next0);
2485  }
2486 
2487  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2488  }
2489 
2490  vlib_error_count (vm, node->node_index,
2491  ETHERNET_ARP_ERROR_replies_sent, n_replies_sent);
2492  return frame->n_vectors;
2493 }
2494 
2495 /* *INDENT-OFF* */
2497  .function = arp_term_l2bd,
2498  .name = "arp-term-l2bd",
2499  .vector_size = sizeof (u32),
2500  .n_errors = ETHERNET_ARP_N_ERROR,
2501  .error_strings = ethernet_arp_error_strings,
2502  .n_next_nodes = ARP_TERM_N_NEXT,
2503  .next_nodes = {
2504  [ARP_TERM_NEXT_L2_OUTPUT] = "l2-output",
2505  [ARP_TERM_NEXT_DROP] = "error-drop",
2506  },
2507  .format_buffer = format_ethernet_arp_header,
2508  .format_trace = format_arp_term_input_trace,
2509 };
2510 /* *INDENT-ON* */
2511 
2512 clib_error_t *
2514 {
2515  // Initialize the feature next-node indexes
2517  arp_term_l2bd_node.index,
2521  return 0;
2522 }
2523 
2525 
2526 void
2528 {
2529  if (e->sw_if_index == sw_if_index)
2530  {
2533  }
2534 }
2535 
2536 void
2538 {
2541  adj_index_t ai;
2542 
2543  /* *INDENT-OFF* */
2544  pool_foreach (e, am->ip4_entry_pool,
2545  ({
2546  change_arp_mac (sw_if_index, e);
2547  }));
2548  /* *INDENT-ON* */
2549 
2550  ai = adj_glean_get (FIB_PROTOCOL_IP4, sw_if_index);
2551 
2552  if (ADJ_INDEX_INVALID != ai)
2554 }
2555 
2556 void
2558 {
2559  ip4_main_t *i4m = &ip4_main;
2560  ip4_address_t *ip4_addr = ip4_interface_first_address (i4m, sw_if_index, 0);
2561 
2562  send_ip4_garp_w_addr (vm, ip4_addr, sw_if_index);
2563 }
2564 
2565 void
2567  const ip4_address_t * ip4_addr, u32 sw_if_index)
2568 {
2569  ip4_main_t *i4m = &ip4_main;
2570  vnet_main_t *vnm = vnet_get_main ();
2571  u8 *rewrite, rewrite_len;
2572  vnet_hw_interface_t *hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
2573 
2574  if (ip4_addr)
2575  {
2576  clib_warning ("Sending GARP for IP4 address %U on sw_if_idex %d",
2577  format_ip4_address, ip4_addr, sw_if_index);
2578 
2579  /* Form GARP packet for output - Gratuitous ARP is an ARP request packet
2580  where the interface IP/MAC pair is used for both source and request
2581  MAC/IP pairs in the request */
2582  u32 bi = 0;
2584  (vm, &i4m->ip4_arp_request_packet_template, &bi);
2585 
2586  if (!h)
2587  return;
2588 
2591  h->ip4_over_ethernet[0].ip4 = ip4_addr[0];
2592  h->ip4_over_ethernet[1].ip4 = ip4_addr[0];
2593 
2594  /* Setup MAC header with ARP Etype and broadcast DMAC */
2595  vlib_buffer_t *b = vlib_get_buffer (vm, bi);
2596  rewrite =
2597  ethernet_build_rewrite (vnm, sw_if_index, VNET_LINK_ARP,
2599  rewrite_len = vec_len (rewrite);
2600  vlib_buffer_advance (b, -rewrite_len);
2602  clib_memcpy_fast (e->dst_address, rewrite, rewrite_len);
2603  vec_free (rewrite);
2604 
2605  /* Send GARP packet out the specified interface */
2606  vnet_buffer (b)->sw_if_index[VLIB_RX] =
2607  vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index;
2609  u32 *to_next = vlib_frame_vector_args (f);
2610  to_next[0] = bi;
2611  f->n_vectors = 1;
2613  }
2614 }
2615 
2616 /*
2617  * Remove any arp entries associated with the specified interface
2618  */
2619 static clib_error_t *
2621 {
2622  if (!is_add && sw_if_index != ~0)
2623  {
2626  /* *INDENT-OFF* */
2627  pool_foreach (e, am->ip4_entry_pool, ({
2628  if (e->sw_if_index != sw_if_index)
2629  continue;
2630  vnet_arp_set_ip4_over_ethernet_rpc_args_t args = {
2631  .sw_if_index = sw_if_index,
2632  .ip4 = e->ip4_address,
2633  };
2635  }));
2636  /* *INDENT-ON* */
2637  }
2638 
2639  return (NULL);
2640 }
2641 
2643 
2644 /*
2645  * fd.io coding-style-patch-verification: ON
2646  *
2647  * Local Variables:
2648  * eval: (c-set-style "gnu")
2649  * End:
2650  */
#define vec_validate(V, I)
Make sure vector is long enough for given index (no header, unspecified alignment) ...
Definition: vec.h:439
ip_neighbor_flags_t flags
Definition: arp.h:31
u32 sw_if_index
Definition: ipsec_gre.api:37
#define vnet_rewrite_one_header(rw0, p0, most_likely_size)
Definition: rewrite.h:199
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
Definition: edit.h:64
static void set_ip4_over_ethernet_rpc_callback(vnet_arp_set_ip4_over_ethernet_rpc_args_t *a)
Definition: arp.c:1876
vmrglw vmrglh hi
int vnet_arp_set_ip4_over_ethernet(vnet_main_t *vnm, u32 sw_if_index, const ethernet_arp_ip4_over_ethernet_address_t *a, ip_neighbor_flags_t flags)
Definition: arp.c:1966
#define pool_next_index(P, I)
Return next occupied pool index after i, useful for safe iteration.
Definition: pool.h:522
fib_node_index_t fib_table_entry_path_add(u32 fib_index, const fib_prefix_t *prefix, fib_source_t source, fib_entry_flag_t flags, dpo_proto_t next_hop_proto, const ip46_address_t *next_hop, u32 next_hop_sw_if_index, u32 next_hop_fib_index, u32 next_hop_weight, fib_mpls_label_t *next_hop_labels, fib_route_path_flags_t path_flags)
Add one path to an entry (aka route) in the FIB.
Definition: fib_table.c:522
typedef address
Definition: ip_types.api:30
#define VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST
Definition: rewrite.h:224
static uword arp_term_l2bd(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
Definition: arp.c:2286
#define hash_set(h, key, value)
Definition: hash.h:255
l2_input_config_t * configs
Definition: l2_input.h:61
u32 flags
Definition: vhost_user.h:115
An entry in a FIB table.
Definition: fib_entry.h:462
ip4_table_bind_function_t * function
Definition: ip4.h:83
#define CLIB_UNUSED(x)
Definition: clib.h:82
u8 * format_ethernet_arp_ip4_entry(u8 *s, va_list *va)
Definition: arp.c:251
ip4_add_del_interface_address_callback_t * add_del_interface_address_callbacks
Functions to call when interface address changes.
Definition: ip4.h:130
#define hash_unset(h, key)
Definition: hash.h:261
a
Definition: bitmap.h:538
int vnet_arp_unset_ip4_over_ethernet(vnet_main_t *vnm, u32 sw_if_index, const ethernet_arp_ip4_over_ethernet_address_t *a)
Control Plane hook to remove an ARP entry.
Definition: arp.c:1553
An indication that the rewrite is incomplete, i.e.
Definition: adj_nbr.h:90
static uword * vlib_process_wait_for_event(vlib_main_t *vm)
Definition: node_funcs.h:593
uword unformat_pg_arp_header(unformat_input_t *input, va_list *args)
Definition: arp.c:1505
static void pg_ethernet_arp_header_init(pg_ethernet_arp_header_t *p)
Definition: arp.c:1488
static int vnet_arp_unset_ip4_over_ethernet_internal(vnet_main_t *vnm, vnet_arp_set_ip4_over_ethernet_rpc_args_t *args)
Definition: arp.c:1827
static void increment_ip4_and_mac_address(ethernet_arp_ip4_over_ethernet_address_t *a)
Definition: arp.c:1943
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 vnet_hw_interface_t * vnet_get_sup_hw_interface(vnet_main_t *vnm, u32 sw_if_index)
static uword vlib_current_process(vlib_main_t *vm)
Definition: node_funcs.h:400
static void arp_add_del_interface_address(ip4_main_t *im, uword opaque, u32 sw_if_index, ip4_address_t *address, u32 address_length, u32 if_address_index, u32 is_del)
Definition: arp.c:1667
static void pg_edit_set_fixed(pg_edit_t *e, u64 value)
Definition: edit.h:153
static clib_error_t * show_ip4_arp(vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd)
Definition: arp.c:1413
vnet_interface_main_t interface_main
Definition: vnet.h:56
pending_resolution_t * pending_resolutions
Definition: arp.c:80
u32 sw_if_index
Definition: arp.h:91
static void vlib_error_count(vlib_main_t *vm, uword node_index, uword counter, uword increment)
Definition: error_funcs.h:57
Multicast Adjacency.
Definition: adj.h:82
#define clib_memcpy_fast(a, b, c)
Definition: string.h:81
struct pg_ethernet_arp_header_t::@128 ip4_over_ethernet[2]
vnet_link_t adj_get_link_type(adj_index_t ai)
Return the link type of the adjacency.
Definition: adj.c:468
#define NULL
Definition: clib.h:58
ip4_address_t * ip4_interface_first_address(ip4_main_t *im, u32 sw_if_index, ip_interface_address_t **result_ia)
Definition: ip4_forward.c:314
static f64 vlib_time_now(vlib_main_t *vm)
Definition: main.h:255
Broadcasr Adjacency.
Definition: adj.h:85
IP unicast adjacency.
Definition: adj.h:221
Information related to the source of a FIB entry.
Definition: fib_entry.h:354
struct ethernet_arp_interface_t_ ethernet_arp_interface_t
Per-interface ARP configuration and state.
void change_arp_mac(u32 sw_if_index, ethernet_arp_ip4_entry_t *e)
Definition: arp.c:2527
static u8 * format_ethernet_arp_header(u8 *s, va_list *va)
Definition: arp.c:204
u8 src_address[6]
Definition: packet.h:56
static clib_error_t * set_int_proxy_arp_command_fn(vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd)
Definition: arp.c:2206
clib_error_t * ip4_set_arp_limit(u32 arp_limit)
Definition: arp.c:1541
static uword arp_input(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
Definition: arp.c:940
This packet is to be rewritten and forwarded to the next processing node.
Definition: adj.h:73
#define vec_add1(V, E)
Add 1 element to end of vector (unspecified alignment).
Definition: vec.h:522
word vnet_sw_interface_compare(vnet_main_t *vnm, uword sw_if_index0, uword sw_if_index1)
Definition: interface.c:1186
void arp_update_adjacency(vnet_main_t *vnm, u32 sw_if_index, u32 ai)
Definition: arp.c:446
static void arp_table_bind(ip4_main_t *im, uword opaque, u32 sw_if_index, u32 new_fib_index, u32 old_fib_index)
Definition: arp.c:1725
static uword unformat_ethernet_arp_opcode_host_byte_order(unformat_input_t *input, va_list *args)
Definition: arp.c:163
#define vec_add2(V, P, N)
Add N elements to end of vector V, return pointer to new elements in P.
Definition: vec.h:560
int i
static_always_inline void mac_address_copy(mac_address_t *dst, const mac_address_t *src)
Definition: mac_address.h:128
adj_index_t adj_glean_get(fib_protocol_t proto, u32 sw_if_index)
Get an existing glean.
Definition: adj_glean.c:119
uword unformat_user(unformat_input_t *input, unformat_function_t *func,...)
Definition: unformat.c:983
static u32 format_get_indent(u8 *s)
Definition: format.h:72
uword unformat_pg_edit(unformat_input_t *input, va_list *args)
Definition: edit.c:106
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:598
pg_edit_t l2_type
Definition: arp.c:1477
static vnet_sw_interface_t * vnet_get_sw_interface(vnet_main_t *vnm, u32 sw_if_index)
const fib_prefix_t * fib_entry_get_prefix(fib_node_index_t fib_entry_index)
Definition: fib_entry.c:1688
u32 * fib_index_by_sw_if_index
Table index indexed by software interface.
Definition: ip4.h:112
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:424
uword * opcode_by_name
Definition: arp.c:76
unformat_function_t unformat_vnet_sw_interface
u8 data[128]
Definition: ipsec.api:248
static uword ip4_address_is_multicast(const ip4_address_t *a)
Definition: ip4_packet.h:318
void vl_api_rpc_call_main_thread(void *fp, u8 *data, u32 data_length)
Definition: vlib_api.c:623
vlib_error_t * errors
Vector of errors for this node.
Definition: node.h:468
Definition: fib_entry.h:277
#define pool_get(P, E)
Allocate an object E from a pool P (unspecified alignment).
Definition: pool.h:236
vhost_vring_addr_t addr
Definition: vhost_user.h:121
ip6_address_t src_address
Definition: ip6_packet.h:385
unsigned char u8
Definition: types.h:56
struct ip_adjacency_t_::@46::@47 nbr
IP_LOOKUP_NEXT_ARP/IP_LOOKUP_NEXT_REWRITE.
static u32 vnet_l2_feature_next(vlib_buffer_t *b, u32 *next_nodes, u32 feat_bit)
Return the graph node index for the feature corresponding to the next set bit after clearing the curr...
Definition: feat_bitmap.h:94
#define vec_reset_length(v)
Reset vector length to zero NULL-pointer tolerant.
static pg_node_t * pg_get_node(uword node_index)
Definition: pg.h:357
vnet_link_t ia_link
link/ether-type 1 bytes
Definition: adj.h:242
static int vnet_arp_populate_ip4_over_ethernet_internal(vnet_main_t *vnm, vnet_arp_set_ip4_over_ethernet_rpc_args_t *args)
Definition: arp.c:1854
u32 send_garp_na_process_node_index
Definition: arp.c:120
Adjacency to punt this packet.
Definition: adj.h:55
VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION(ethernet_arp_sw_interface_up_down)
arp_input_next_t
Definition: arp.c:872
void adj_glean_update_rewrite(adj_index_t adj_index)
adj_glean_update_rewrite
Definition: adj_glean.c:101
static const u8 vrrp_prefix[]
Definition: arp.c:117
u32 ip4_fib_table_get_index_for_sw_if_index(u32 sw_if_index)
Definition: ip4_fib.c:224
format_function_t format_ip4_address
Definition: format.h:75
static ip_adjacency_t * adj_get(adj_index_t adj_index)
Get a pointer to an adjacency object from its index.
Definition: adj.h:433
pg_edit_t n_l3_address_bytes
Definition: arp.c:1478
void * vlib_packet_template_get_packet(vlib_main_t *vm, vlib_packet_template_t *t, u32 *bi_result)
Definition: buffer.c:389
#define pool_foreach(VAR, POOL, BODY)
Iterate through pool.
Definition: pool.h:493
unformat_function_t unformat_ip4_address
Definition: format.h:70
ethernet_arp_ip4_over_ethernet_address_t ip4_over_ethernet[2]
Definition: arp_packet.h:141
#define VLIB_INIT_FUNCTION(x)
Definition: init.h:163
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:516
static ethernet_arp_ip4_entry_t * force_reuse_arp_entry(void)
Definition: arp.c:585
static uword ethernet_address_cast(u8 *a)
Definition: packet.h:67
pending_resolution_t * mac_changes
Definition: arp.c:84
enum ip_neighbor_flags_t_ ip_neighbor_flags_t
u8 dst_address[6]
Definition: packet.h:55
static int vnet_arp_set_ip4_over_ethernet_internal(vnet_main_t *vnm, vnet_arp_set_ip4_over_ethernet_rpc_args_t *args)
Definition: arp.c:617
u8 * format_white_space(u8 *s, va_list *va)
Definition: std-formats.c:113
static int ip4_arp_entry_sort(void *a1, void *a2)
Definition: arp.c:1372
enum adj_walk_rc_t_ adj_walk_rc_t
return codes from a adjacency walker callback function
void proxy_arp_walk(proxy_arp_walk_t cb, void *data)
Definition: arp.c:1985
#define vec_elt_at_index(v, i)
Get vector value at index i checking that i is in bounds.
Aggregrate type for a prefix.
Definition: fib_types.h:203
u8 * format_hex_bytes(u8 *s, va_list *va)
Definition: std-formats.c:84
vlib_frame_t * vlib_get_frame_to_node(vlib_main_t *vm, u32 to_node_index)
Definition: main.c:187
#define clib_error_return(e, args...)
Definition: error.h:99
ethernet_arp_hardware_type_t
Definition: arp_packet.h:91
static u8 * format_ethernet_arp_input_trace(u8 *s, va_list *va)
Definition: arp.c:290
#define foreach_ethernet_arp_opcode
Definition: arp_packet.h:63
uword * pending_resolutions_by_address
Definition: arp.c:79
unsigned int u32
Definition: types.h:88
static void * pg_create_edit_group(pg_stream_t *s, int n_edit_bytes, int n_packet_bytes, u32 *group_index)
Definition: pg.h:228
u32 fib_table_find(fib_protocol_t proto, u32 table_id)
Get the index of the FIB for a Table-ID.
Definition: fib_table.c:1064
u16 fp_len
The mask length.
Definition: fib_types.h:207
#define vlib_call_init_function(vm, x)
Definition: init.h:260
int(* arp_change_event_cb_t)(u32 pool_index, const mac_address_t *mac, u32 sw_if_index, const ip4_address_t *address)
Definition: arp.h:69
static ethernet_arp_ip4_entry_t * arp_entry_find(ethernet_arp_interface_t *eai, const ip4_address_t *addr)
Definition: arp.c:409
#define hash_create_string(elts, value_bytes)
Definition: hash.h:690
pg_edit_t l3_type
Definition: arp.c:1477
static adj_walk_rc_t arp_mk_complete_walk(adj_index_t ai, void *ctx)
Definition: arp.c:428
Per-interface ARP configuration and state.
Definition: arp.c:46
static heap_elt_t * first(heap_header_t *h)
Definition: heap.c:59
vlib_error_t error
Error code for buffers to be enqueued to error handler.
Definition: buffer.h:136
#define FOR_EACH_SRC_ADDED(_entry, _src, _source, action)
Definition: fib_entry.h:280
#define hash_get(h, key)
Definition: hash.h:249
format_function_t format_vnet_sw_interface_name
void adj_mcast_update_rewrite(adj_index_t adj_index, u8 *rewrite, u8 offset)
adj_mcast_update_rewrite
Definition: adj_mcast.c:102
#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
#define pool_elt_at_index(p, i)
Returns pointer to element at given index.
Definition: pool.h:514
static ethernet_header_t * ethernet_buffer_get_header(vlib_buffer_t *b)
Definition: ethernet.h:376
static_always_inline void mac_address_from_bytes(mac_address_t *mac, const u8 *bytes)
Definition: mac_address.h:92
#define foreach_ethernet_arp_error
Definition: arp.c:879
vlib_main_t * vlib_main
Definition: vnet.h:80
static void arp_mk_complete(adj_index_t ai, ethernet_arp_ip4_entry_t *e)
Definition: arp.c:385
static void vlib_process_signal_event(vlib_main_t *vm, uword node_index, uword type_opaque, uword data)
Definition: node_funcs.h:934
Adjacency source.
Definition: fib_entry.h:108
enum fib_source_t_ fib_source_t
The different sources that can create a route.
ip46_address_t fp_addr
The address type is not deriveable from the fp_addr member.
Definition: fib_types.h:226
uword type_opaque
Definition: arp.c:66
vlib_frame_t * data_callback(flow_report_main_t *frm, flow_report_t *fr, vlib_frame_t *f, u32 *to_next, u32 node_index)
u8 address_length
Definition: ip_types.api:37
#define ETHERNET_ARP_ARGS_FLUSH
Definition: arp.c:112
ip4_address_t ip4_address
Definition: arp.h:27
long ctx[MAX_CONNS]
Definition: main.c:144
mac_address_t mac
Definition: arp.h:29
struct _unformat_input_t unformat_input_t
u32 sw_if_index
Definition: arp.h:26
unsigned short u16
Definition: types.h:57
ethernet_arp_ip4_entry_t * ip4_neighbors_pool(void)
Definition: arp.c:1387
void vlib_put_frame_to_node(vlib_main_t *vm, u32 to_node_index, vlib_frame_t *f)
Definition: main.c:196
static void * vlib_buffer_get_current(vlib_buffer_t *b)
Get pointer to current data to process.
Definition: buffer.h:229
u8 * ip_enabled_by_sw_if_index
Definition: ip4.h:118
#define pool_put(P, E)
Free an object E in pool P.
Definition: pool.h:286
static void * vlib_process_signal_event_data(vlib_main_t *vm, uword node_index, uword type_opaque, uword n_data_elts, uword n_data_elt_bytes)
Definition: node_funcs.h:828
#define PREDICT_FALSE(x)
Definition: clib.h:111
This packet matches an "interface route" and packets need to be passed to ARP to find rewrite string ...
Definition: adj.h:68
vnet_sw_interface_flags_t flags
Definition: interface.h:684
ethernet_arp_interface_t * ethernet_arp_by_sw_if_index
Per interface state.
Definition: arp.c:93
vl_api_ip4_address_t src
Definition: ipsec_gre.api:38
u32 node_index
Node index.
Definition: node.h:494
static clib_error_t * ethernet_arp_init(vlib_main_t *vm)
Definition: arp.c:1760
static_always_inline int mac_address_equal(const mac_address_t *a, const mac_address_t *b)
Definition: mac_address.h:140
#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:218
#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:338
void fib_table_unlock(u32 fib_index, fib_protocol_t proto, fib_source_t source)
Take a reference counting lock on the table.
Definition: fib_table.c:1237
static clib_error_t * vnet_arp_delete_sw_interface(vnet_main_t *vnm, u32 sw_if_index, u32 is_add)
Definition: arp.c:2620
ethernet_arp_opcode_t
Definition: arp_packet.h:98
uword unformat_mac_address_t(unformat_input_t *input, va_list *args)
Definition: mac_address.c:37
u32 fib_entry_get_resolving_interface(fib_node_index_t entry_index)
Definition: fib_entry.c:1461
static clib_error_t * ip_arp_add_del_command_fn(vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd)
Definition: arp.c:2070
u8 * format_ethernet_type(u8 *s, va_list *args)
Definition: format.c:64
fib_node_index_t ip4_fib_table_lookup(const ip4_fib_t *fib, const ip4_address_t *addr, u32 len)
Definition: ip4_fib.c:291
static void arp_adj_fib_add(ethernet_arp_ip4_entry_t *e, u32 fib_index)
Definition: arp.c:543
ethernet_proxy_arp_t * proxy_arps
Definition: arp.c:96
This packet matches an "incomplete adjacency" and packets need to be passed to ARP to find rewrite st...
Definition: adj.h:63
void send_ip4_garp(vlib_main_t *vm, u32 sw_if_index)
Definition: arp.c:2557
int fib_entry_is_sourced(fib_node_index_t fib_entry_index, fib_source_t source)
Adjacency to drop this packet.
Definition: adj.h:53
#define VLIB_REGISTER_NODE(x,...)
Definition: node.h:169
#define UNFORMAT_END_OF_INPUT
Definition: format.h:144
u16 n_vectors
Definition: node.h:395
static_always_inline uword vlib_get_thread_index(void)
Definition: threads.h:212
static void arp_mk_incomplete(adj_index_t ai)
Definition: arp.c:395
vlib_main_t * vm
Definition: buffer.c:312
int ip4_address_compare(ip4_address_t *a1, ip4_address_t *a2)
Definition: ip46_cli.c:53
pg_edit_t n_l2_address_bytes
Definition: arp.c:1478
#define vec_free(V)
Free vector&#39;s memory (no header).
Definition: vec.h:341
ip4_add_del_interface_address_function_t * function
Definition: ip4.h:73
static ethernet_arp_main_t ethernet_arp_main
Definition: arp.c:102
static ip4_fib_t * ip4_fib_get(u32 index)
Get the FIB at the given index.
Definition: ip4_fib.h:113
static void feat_bitmap_init_next_nodes(vlib_main_t *vm, u32 node_index, u32 num_features, char **feat_names, u32 *next_nodes)
Initialize the feature next-node indexes of a graph node.
Definition: feat_bitmap.h:43
Multicast Midchain Adjacency.
Definition: adj.h:89
static int ethernet_mac_address_equal(const u8 *a, const u8 *b)
Definition: mac_address.h:85
static char * ethernet_arp_error_strings[]
Definition: arp.c:1347
#define ETHERNET_ARP_ARGS_POPULATE
Definition: arp.c:113
#define clib_warning(format, args...)
Definition: error.h:59
static vlib_node_runtime_t * vlib_node_get_runtime(vlib_main_t *vm, u32 node_index)
Get node runtime by node index.
Definition: node_funcs.h:89
unformat_function_t * unformat_edit
Definition: pg.h:310
uword * mac_changes_by_address
Definition: arp.c:83
uword wc_ip4_arp_publisher_et
Definition: arp.c:99
void wc_arp_set_publisher_node(uword node_index, uword event_type)
Definition: arp.c:1611
static void arp_adj_fib_remove(ethernet_arp_ip4_entry_t *e, u32 fib_index)
Definition: arp.c:561
u32 fib_node_index_t
A typedef of a node index.
Definition: fib_types.h:30
u32 adj_index_t
An index for adjacencies.
Definition: adj_types.h:30
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:458
int vnet_add_del_ip4_arp_change_event(vnet_main_t *vnm, arp_change_event_cb_t data_callback, u32 pid, void *address_arg, uword node_index, uword type_opaque, uword data, int is_add)
Definition: arp.c:801
void vnet_register_ip4_arp_resolution_event(vnet_main_t *vnm, void *address_arg, uword node_index, uword type_opaque, uword data)
Definition: arp.c:770
static clib_error_t * ethernet_arp_sw_interface_up_down(vnet_main_t *vnm, u32 sw_if_index, u32 flags)
Invoked when the interface&#39;s admin state changes.
Definition: arp.c:1898
char ** l2input_get_feat_names(void)
Return an array of strings containing graph node names of each feature.
Definition: l2_input.c:62
fib_entry_t * fib_entry_get(fib_node_index_t index)
Definition: fib_entry.c:50
int vnet_proxy_arp_add_del(ip4_address_t *lo_addr, ip4_address_t *hi_addr, u32 fib_index, int is_del)
Definition: arp.c:1998
enum fib_entry_flag_t_ fib_entry_flag_t
static u8 * format_ethernet_arp_opcode(u8 *s, va_list *va)
Definition: arp.c:145
void send_ip4_garp_w_addr(vlib_main_t *vm, const ip4_address_t *ip4_addr, u32 sw_if_index)
Definition: arp.c:2566
ip_neighbor_flags_t nbr_flags
Definition: arp.c:109
void fib_table_lock(u32 fib_index, fib_protocol_t proto, fib_source_t source)
Release a reference counting lock on the table.
Definition: fib_table.c:1257
#define VLIB_CLI_COMMAND(x,...)
Definition: cli.h:155
This packets follow a mid-chain adjacency.
Definition: adj.h:76
clib_error_t * arp_term_init(vlib_main_t *vm)
Definition: arp.c:2513
vlib_packet_template_t ip4_arp_request_packet_template
Template used to generate IP4 ARP packets.
Definition: ip4.h:136
#define hash_create(elts, value_bytes)
Definition: hash.h:696
#define ETHERNET_ARP_ARGS_REMOVE
Definition: arp.c:111
u16 cached_next_index
Next frame index that vector arguments were last enqueued to last time this node ran.
Definition: node.h:513
static int vnet_arp_wc_publish(u32 sw_if_index, const ethernet_arp_ip4_over_ethernet_address_t *a)
publish wildcard arp event
Definition: arp.c:1576
#define ASSERT(truth)
u32 arp_term_next_node_index[32]
Definition: arp.c:2283
#define vec_delete(V, N, M)
Delete N elements starting at element M.
Definition: vec.h:784
u8 is_add
Definition: ipsec_gre.api:36
walk_rc_t() proxy_arp_walk_t(const ip4_address_t *lo_addr, const ip4_address_t *hi_addr, u32 fib_index, void *dat)
call back function when walking the DB of proxy ARPs
Definition: arp.h:100
The default route source.
Definition: fib_entry.h:137
IPv4 main type.
Definition: ip4.h:96
uword unformat_vlib_number_by_name(unformat_input_t *input, va_list *args)
Definition: format.c:157
static void pg_free_edit_group(pg_stream_t *s)
Definition: pg.h:281
u32 arp_delete_rotor
Definition: arp.c:89
static void vlib_buffer_advance(vlib_buffer_t *b, word l)
Advance current data pointer by the supplied (signed!) amount.
Definition: buffer.h:248
size_t count
Definition: vapi.c:47
#define clib_mem_unaligned(pointer, type)
Definition: types.h:155
format_function_t format_ip6_header
Definition: format.h:97
void fib_table_entry_path_remove(u32 fib_index, const fib_prefix_t *prefix, fib_source_t source, dpo_proto_t next_hop_proto, const ip46_address_t *next_hop, u32 next_hop_sw_if_index, u32 next_hop_fib_index, u32 next_hop_weight, fib_route_path_flags_t path_flags)
remove one path to an entry (aka route) in the FIB.
Definition: fib_table.c:682
static void arp_nbr_probe(ip_adjacency_t *adj)
Definition: arp.c:321
Definition: pg.h:94
void ethernet_register_input_type(vlib_main_t *vm, ethernet_type_t type, u32 node_index)
Definition: node.c:2061
static vlib_main_t * vlib_get_main(void)
Definition: global_funcs.h:23
static vlib_node_registration_t arp_term_l2bd_node
(constructor) VLIB_REGISTER_NODE (arp_term_l2bd_node)
Definition: arp.c:2496
uword * arp_entries
Hash table of ARP entries.
Definition: arp.c:52
static void * vlib_add_trace(vlib_main_t *vm, vlib_node_runtime_t *r, vlib_buffer_t *b, u32 n_data_bytes)
Definition: trace_funcs.h:57
#define vec_elt(v, i)
Get vector value at index i.
ip4_table_bind_callback_t * table_bind_callbacks
Functions to call when interface to table biding changes.
Definition: ip4.h:133
f64 time_last_updated
Definition: arp.h:33
static u32 arp_learn(vnet_main_t *vnm, ethernet_arp_main_t *am, u32 sw_if_index, const ethernet_arp_ip4_over_ethernet_address_t *addr)
Definition: arp.c:931
fib_entry_flag_t fib_entry_get_flags_for_source(fib_node_index_t fib_entry_index, fib_source_t source)
This packets needs to go to ICMP error.
Definition: adj.h:79
This packet is for one of our own IP addresses.
Definition: adj.h:58
Definition: defs.h:47
void vlib_trace_frame_buffers_only(vlib_main_t *vm, vlib_node_runtime_t *node, u32 *buffers, uword n_buffers, uword next_buffer_stride, uword n_buffer_data_bytes_in_trace)
Definition: trace.c:47
ip4_address_t hi_addr
Definition: arp.c:58
l2input_main_t l2input_main
Definition: l2_input.c:128
static vlib_node_registration_t arp_input_node
(constructor) VLIB_REGISTER_NODE (arp_input_node)
Definition: arp.c:1354
union ip_adjacency_t_::@46 sub_type
#define FIB_NODE_INDEX_INVALID
Definition: fib_types.h:31
int vnet_proxy_arp_fib_reset(u32 fib_id)
Definition: arp.c:2039
fib_node_index_t fib_entry_index
The index of the adj-fib entry created.
Definition: arp.h:38
#define vec_len(v)
Number of elements in vector (rvalue-only, NULL tolerant)
ip_lookup_next_t lookup_next_index
Next hop after ip4-lookup.
Definition: adj.h:236
#define hash_foreach_pair(p, v, body)
Iterate over hash pairs.
Definition: hash.h:373
Definition: fib_entry.h:276
VLIB buffer representation.
Definition: buffer.h:102
u64 uword
Definition: types.h:112
format_function_t format_vlib_time
Definition: node_funcs.h:1145
#define vec_sort_with_function(vec, f)
Sort a vector using the supplied element comparison function.
Definition: vec.h:980
#define ETHERNET_ARP_ARGS_WC_PUB
Definition: arp.c:114
static u8 * format_arp_term_input_trace(u8 *s, va_list *va)
Definition: arp.c:304
static int vnet_arp_flush_ip4_over_ethernet_internal(vnet_main_t *vnm, vnet_arp_set_ip4_over_ethernet_rpc_args_t *args)
Definition: arp.c:1622
vnet_sw_interface_t * sw_interfaces
Definition: interface.h:815
static void * vlib_frame_vector_args(vlib_frame_t *f)
Get pointer to frame vector data.
Definition: node_funcs.h:244
static clib_error_t * ethernet_init(vlib_main_t *vm)
Definition: init.c:83
static u8 * format_ethernet_arp_hardware_type(u8 *s, va_list *va)
Definition: arp.c:127
u8 * ethernet_build_rewrite(vnet_main_t *vnm, u32 sw_if_index, vnet_link_t link_type, const void *dst_address)
build a rewrite string to use for sending packets of type &#39;link_type&#39; to &#39;dst_address&#39; ...
Definition: interface.c:81
l2_bridge_domain_t * bd_configs
Definition: l2_input.h:64
static void arp_entry_free(ethernet_arp_interface_t *eai, ethernet_arp_ip4_entry_t *e)
Definition: arp.c:1816
pg_edit_t opcode
Definition: arp.c:1479
ethernet_arp_input_error_t
Definition: arp.c:897
arp_term_next_t
Definition: arp.c:2276
static void vnet_arp_wc_publish_internal(vnet_main_t *vnm, vnet_arp_set_ip4_over_ethernet_rpc_args_t *args)
Definition: arp.c:1592
struct clib_bihash_value offset
template key/value backing page structure
mac_address_t mac
Definition: arp.h:93
u32 limit_arp_cache_size
Definition: arp.c:90
static uword ip6_address_is_unspecified(const ip6_address_t *a)
Definition: ip6_packet.h:312
ip4_address_t ip
Definition: arp.h:92
ip4_address_t lo_addr
Definition: arp.c:57
#define vnet_buffer(b)
Definition: buffer.h:369
u8 * format_unformat_error(u8 *s, va_list *va)
Definition: unformat.c:91
ip4_main_t ip4_main
Global ip4 main structure.
Definition: ip4_forward.c:905
uword node_index
Definition: arp.c:65
u8 * format_mac_address_t(u8 *s, va_list *args)
Definition: mac_address.c:27
#define vec_foreach(var, vec)
Vector iterator.
arp_change_event_cb_t data_callback
Definition: arp.c:69
uword * mac_by_ip4
Definition: l2_bd.h:101
u16 flags
Copy of main node flags.
Definition: node.h:507
static int arp_unnumbered(vlib_buffer_t *p0, u32 input_sw_if_index, u32 conn_sw_if_index)
Definition: arp.c:906
ethernet_arp_ip4_entry_t * ip4_neighbor_entries(u32 sw_if_index)
Definition: arp.c:1394
uword wc_ip4_arp_publisher_node
Definition: arp.c:98
VNET_SW_INTERFACE_ADD_DEL_FUNCTION(vnet_arp_delete_sw_interface)
#define VLIB_NODE_FLAG_TRACE
Definition: node.h:301
static uword unformat_ethernet_arp_opcode_net_byte_order(unformat_input_t *input, va_list *args)
Definition: arp.c:191
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:298
void ethernet_arp_change_mac(u32 sw_if_index)
Definition: arp.c:2537
vl_api_mac_address_t mac
Definition: gbp.api:120
void vlib_cli_output(vlib_main_t *vm, char *fmt,...)
Definition: cli.c:762
ethernet_arp_ip4_entry_t * ip4_entry_pool
Definition: arp.c:86
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
Definition: pg.h:307
const u8 * ethernet_ip4_mcast_dst_addr(void)
Definition: interface.c:57
uword unformat(unformat_input_t *i, const char *fmt,...)
Definition: unformat.c:972
int vnet_ip6_nd_term(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_buffer_t *p0, ethernet_header_t *eth, ip6_header_t *ip, u32 sw_if_index, u16 bd_index)
Definition: defs.h:46
static uword unformat_check_input(unformat_input_t *i)
Definition: format.h:170
Definition: arp.h:24
fib_entry_flag_t fib_entry_get_flags(fib_node_index_t fib_entry_index)
Definition: fib_entry.c:301
static adj_walk_rc_t arp_mk_incomplete_walk(adj_index_t ai, void *ctx)
Definition: arp.c:438
static ip4_address_t * ip4_interface_address_matching_destination(ip4_main_t *im, ip4_address_t *dst, u32 sw_if_index, ip_interface_address_t **result_ia)
Definition: ip4.h:219
static uword pool_elts(void *v)
Number of active elements in a pool.
Definition: pool.h:128