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Vector Packet Processing
arp.c
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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/ip6.h>
20 #include <vnet/ethernet/ethernet.h>
21 #include <vnet/ethernet/arp.h>
22 #include <vnet/l2/l2_input.h>
23 #include <vppinfra/mhash.h>
24 #include <vnet/fib/ip4_fib.h>
25 #include <vnet/fib/fib_entry_src.h>
26 #include <vnet/adj/adj_nbr.h>
27 #include <vnet/adj/adj_mcast.h>
28 #include <vnet/mpls/mpls.h>
29 #include <vnet/l2/feat_bitmap.h>
30 
31 /**
32  * @file
33  * @brief IPv4 ARP.
34  *
35  * This file contains code to manage the IPv4 ARP tables (IP Address
36  * to MAC Address lookup).
37  */
38 
39 
40 void vl_api_rpc_call_main_thread (void *fp, u8 * data, u32 data_length);
41 
42 /**
43  * @brief Per-interface ARP configuration and state
44  */
46 {
47  /**
48  * Hash table of ARP entries.
49  * Since this hash table is per-interface, the key is only the IPv4 address.
50  */
53 
54 typedef struct
55 {
60 
61 typedef struct
62 {
67  /* Used for arp event notification only */
71 
72 typedef struct
73 {
74  /* Hash tables mapping name to opcode. */
76 
77  /* lite beer "glean" adjacency handling */
80 
81  /* Mac address change notification */
84 
86 
87  /* ARP attack mitigation */
90 
91  /** Per interface state */
93 
94  /* Proxy arp vector */
96 
100 
102 
103 typedef struct
104 {
106  ethernet_arp_ip4_over_ethernet_address_t a;
109  int flags;
110 #define ETHERNET_ARP_ARGS_REMOVE (1<<0)
111 #define ETHERNET_ARP_ARGS_FLUSH (1<<1)
112 #define ETHERNET_ARP_ARGS_POPULATE (1<<2)
113 #define ETHERNET_ARP_ARGS_WC_PUB (1<<3)
115 
116 static const u8 vrrp_prefix[] = { 0x00, 0x00, 0x5E, 0x00, 0x01 };
117 
118 /* Node index for send_garp_na_process */
120 
121 static void
123  * a);
124 
125 static u8 *
127 {
129  char *t = 0;
130  switch (h)
131  {
132 #define _(n,f) case n: t = #f; break;
134 #undef _
135 
136  default:
137  return format (s, "unknown 0x%x", h);
138  }
139 
140  return format (s, "%s", t);
141 }
142 
143 static u8 *
144 format_ethernet_arp_opcode (u8 * s, va_list * va)
145 {
147  char *t = 0;
148  switch (o)
149  {
150 #define _(f) case ETHERNET_ARP_OPCODE_##f: t = #f; break;
152 #undef _
153 
154  default:
155  return format (s, "unknown 0x%x", o);
156  }
157 
158  return format (s, "%s", t);
159 }
160 
161 static uword
163  va_list * args)
164 {
165  int *result = va_arg (*args, int *);
167  int x, i;
168 
169  /* Numeric opcode. */
170  if (unformat (input, "0x%x", &x) || unformat (input, "%d", &x))
171  {
172  if (x >= (1 << 16))
173  return 0;
174  *result = x;
175  return 1;
176  }
177 
178  /* Named type. */
180  am->opcode_by_name, &i))
181  {
182  *result = i;
183  return 1;
184  }
185 
186  return 0;
187 }
188 
189 static uword
191  va_list * args)
192 {
193  int *result = va_arg (*args, int *);
194  if (!unformat_user
196  return 0;
197 
198  *result = clib_host_to_net_u16 ((u16) * result);
199  return 1;
200 }
201 
202 static u8 *
203 format_ethernet_arp_header (u8 * s, va_list * va)
204 {
205  ethernet_arp_header_t *a = va_arg (*va, ethernet_arp_header_t *);
206  u32 max_header_bytes = va_arg (*va, u32);
207  u32 indent;
208  u16 l2_type, l3_type;
209 
210  if (max_header_bytes != 0 && sizeof (a[0]) > max_header_bytes)
211  return format (s, "ARP header truncated");
212 
213  l2_type = clib_net_to_host_u16 (a->l2_type);
214  l3_type = clib_net_to_host_u16 (a->l3_type);
215 
216  indent = format_get_indent (s);
217 
218  s = format (s, "%U, type %U/%U, address size %d/%d",
219  format_ethernet_arp_opcode, clib_net_to_host_u16 (a->opcode),
221  format_ethernet_type, l3_type,
223 
224  if (l2_type == ETHERNET_ARP_HARDWARE_TYPE_ethernet
225  && l3_type == ETHERNET_TYPE_IP4)
226  {
227  s = format (s, "\n%U%U/%U -> %U/%U",
228  format_white_space, indent,
233  }
234  else
235  {
236  uword n2 = a->n_l2_address_bytes;
237  uword n3 = a->n_l3_address_bytes;
238  s = format (s, "\n%U%U/%U -> %U/%U",
239  format_white_space, indent,
240  format_hex_bytes, a->data + 0 * n2 + 0 * n3, n2,
241  format_hex_bytes, a->data + 1 * n2 + 0 * n3, n3,
242  format_hex_bytes, a->data + 1 * n2 + 1 * n3, n2,
243  format_hex_bytes, a->data + 2 * n2 + 1 * n3, n3);
244  }
245 
246  return s;
247 }
248 
249 u8 *
251 {
252  vnet_main_t *vnm = va_arg (*va, vnet_main_t *);
255  u8 *flags = 0;
256 
257  if (!e)
258  return format (s, "%=12s%=16s%=6s%=20s%=24s", "Time", "IP4",
259  "Flags", "Ethernet", "Interface");
260 
261  si = vnet_get_sw_interface (vnm, e->sw_if_index);
262 
264  flags = format (flags, "S");
265 
267  flags = format (flags, "D");
268 
270  flags = format (flags, "N");
271 
272  s = format (s, "%=12U%=16U%=6s%=20U%U",
275  flags ? (char *) flags : "",
278 
279  vec_free (flags);
280  return s;
281 }
282 
283 typedef struct
284 {
285  u8 packet_data[64];
287 
288 static u8 *
290 {
291  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
292  CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
294 
295  s = format (s, "%U",
297  t->packet_data, sizeof (t->packet_data));
298 
299  return s;
300 }
301 
302 static u8 *
303 format_arp_term_input_trace (u8 * s, va_list * va)
304 {
305  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
306  CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
308 
309  /* arp-term trace data saved is either arp or ip6/icmp6 packet:
310  - for arp, the 1st 16-bit field is hw type of value of 0x0001.
311  - for ip6, the first nibble has value of 6. */
312  s = format (s, "%U", t->packet_data[0] == 0 ?
314  t->packet_data, sizeof (t->packet_data));
315 
316  return s;
317 }
318 
319 static void
321 {
322  vnet_main_t *vnm = vnet_get_main ();
323  ip4_main_t *im = &ip4_main;
329  vlib_buffer_t *b;
330  vlib_main_t *vm;
331  u32 bi = 0;
332 
333  vm = vlib_get_main ();
334 
335  si = vnet_get_sw_interface (vnm, adj->rewrite_header.sw_if_index);
336 
338  {
339  return;
340  }
341 
342  src =
344  &adj->sub_type.nbr.next_hop.
345  ip4,
346  adj->rewrite_header.
347  sw_if_index, &ia);
348  if (!src)
349  {
350  return;
351  }
352 
353  h =
355  &bi);
356  if (!h)
357  return;
358 
359  hi = vnet_get_sup_hw_interface (vnm, adj->rewrite_header.sw_if_index);
360 
361  clib_memcpy_fast (h->ip4_over_ethernet[0].ethernet,
362  hi->hw_address,
363  sizeof (h->ip4_over_ethernet[0].ethernet));
364 
365  h->ip4_over_ethernet[0].ip4 = src[0];
366  h->ip4_over_ethernet[1].ip4 = adj->sub_type.nbr.next_hop.ip4;
367 
368  b = vlib_get_buffer (vm, bi);
369  vnet_buffer (b)->sw_if_index[VLIB_RX] =
370  vnet_buffer (b)->sw_if_index[VLIB_TX] = adj->rewrite_header.sw_if_index;
371 
372  /* Add encapsulation string for software interface (e.g. ethernet header). */
373  vnet_rewrite_one_header (adj[0], h, sizeof (ethernet_header_t));
374  vlib_buffer_advance (b, -adj->rewrite_header.data_bytes);
375 
376  {
378  u32 *to_next = vlib_frame_vector_args (f);
379  to_next[0] = bi;
380  f->n_vectors = 1;
382  }
383 }
384 
385 static void
387 {
391  e->sw_if_index,
393 }
394 
395 static void
397 {
398  ip_adjacency_t *adj = adj_get (ai);
399 
401  (ai,
404  adj->rewrite_header.sw_if_index,
407 }
408 
411 {
414  uword *p;
415 
416  if (NULL != eai->arp_entries)
417  {
418  p = hash_get (eai->arp_entries, addr->as_u32);
419  if (!p)
420  return (NULL);
421 
422  e = pool_elt_at_index (am->ip4_entry_pool, p[0]);
423  }
424 
425  return (e);
426 }
427 
428 static adj_walk_rc_t
430 {
432 
433  arp_mk_complete (ai, e);
434 
435  return (ADJ_WALK_RC_CONTINUE);
436 }
437 
438 static adj_walk_rc_t
440 {
441  arp_mk_incomplete (ai);
442 
443  return (ADJ_WALK_RC_CONTINUE);
444 }
445 
446 void
448 {
450  ethernet_arp_interface_t *arp_int;
452  ip_adjacency_t *adj;
453 
454  adj = adj_get (ai);
455 
456  vec_validate (am->ethernet_arp_by_sw_if_index, sw_if_index);
458  e = arp_entry_find (arp_int, &adj->sub_type.nbr.next_hop.ip4);
459 
460  switch (adj->lookup_next_index)
461  {
464  break;
465  case IP_LOOKUP_NEXT_ARP:
466  if (NULL != e)
467  {
468  adj_nbr_walk_nh4 (sw_if_index,
470  }
471  else
472  {
473  /*
474  * no matching ARP entry.
475  * construct the rewrite required to for an ARP packet, and stick
476  * that in the adj's pipe to smoke.
477  */
479  (ai,
482  (vnm,
483  sw_if_index,
486 
487  /*
488  * since the FIB has added this adj for a route, it makes sense it
489  * may want to forward traffic sometime soon. Let's send a
490  * speculative ARP. just one. If we were to do periodically that
491  * wouldn't be bad either, but that's more code than i'm prepared to
492  * write at this time for relatively little reward.
493  */
494  arp_nbr_probe (adj);
495  }
496  break;
501  (vnm,
502  sw_if_index,
505  break;
507  {
508  /*
509  * Construct a partial rewrite from the known ethernet mcast dest MAC
510  */
511  u8 *rewrite;
512  u8 offset;
513 
514  rewrite = ethernet_build_rewrite (vnm,
515  sw_if_index,
516  adj->ia_link,
518  offset = vec_len (rewrite) - 2;
519 
520  /*
521  * Complete the remaining fields of the adj's rewrite to direct the
522  * complete of the rewrite at switch time by copying in the IP
523  * dst address's bytes.
524  * Ofset is 2 bytes into the MAC desintation address.
525  */
526  adj_mcast_update_rewrite (ai, rewrite, offset);
527 
528  break;
529  }
530  case IP_LOOKUP_NEXT_DROP:
531  case IP_LOOKUP_NEXT_PUNT:
537  case IP_LOOKUP_N_NEXT:
538  ASSERT (0);
539  break;
540  }
541 }
542 
543 static void
545 {
546  fib_prefix_t pfx = {
547  .fp_len = 32,
548  .fp_proto = FIB_PROTOCOL_IP4,
549  .fp_addr.ip4 = e->ip4_address,
550  };
551 
552  e->fib_entry_index =
553  fib_table_entry_path_add (fib_index, &pfx, FIB_SOURCE_ADJ,
555  DPO_PROTO_IP4, &pfx.fp_addr,
556  e->sw_if_index, ~0, 1, NULL,
559 }
560 
561 static void
563 {
565  {
566  fib_prefix_t pfx = {
567  .fp_len = 32,
568  .fp_proto = FIB_PROTOCOL_IP4,
569  .fp_addr.ip4 = e->ip4_address,
570  };
571  u32 fib_index;
572 
574 
575  fib_table_entry_path_remove (fib_index, &pfx,
578  &pfx.fp_addr,
579  e->sw_if_index, ~0, 1,
582  }
583 }
584 
587 {
590  u32 count = 0;
592  if (index == ~0) /* Try again from elt 0 */
593  index = pool_next_index (am->ip4_entry_pool, index);
594 
595  /* Find a non-static random entry to free up for reuse */
596  do
597  {
598  if ((count++ == 100) || (index == ~0))
599  return NULL; /* give up after 100 entries */
600  e = pool_elt_at_index (am->ip4_entry_pool, index);
601  am->arp_delete_rotor = index;
602  index = pool_next_index (am->ip4_entry_pool, index);
603  }
605 
606  /* Remove ARP entry from its interface and update fib */
607  hash_unset
609  e->ip4_address.as_u32);
614  return e;
615 }
616 
617 static int
620  * args)
621 {
624  ethernet_arp_ip4_over_ethernet_address_t *a = &args->a;
626  int make_new_arp_cache_entry = 1;
627  uword *p;
628  pending_resolution_t *pr, *mc;
629  ethernet_arp_interface_t *arp_int;
630  int is_static = args->is_static;
631  u32 sw_if_index = args->sw_if_index;
632  int is_no_fib_entry = args->is_no_fib_entry;
633 
634  vec_validate (am->ethernet_arp_by_sw_if_index, sw_if_index);
635 
637 
638  if (NULL != arp_int->arp_entries)
639  {
640  p = hash_get (arp_int->arp_entries, a->ip4.as_u32);
641  if (p)
642  {
643  e = pool_elt_at_index (am->ip4_entry_pool, p[0]);
644 
645  /* Refuse to over-write static arp. */
646  if (!is_static && (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC))
647  {
648  /* if MAC address match, still check to send event */
649  if (0 == memcmp (e->ethernet_address,
650  a->ethernet, sizeof (e->ethernet_address)))
651  goto check_customers;
652  return -2;
653  }
654  make_new_arp_cache_entry = 0;
655  }
656  }
657 
658  if (make_new_arp_cache_entry)
659  {
660  if (am->limit_arp_cache_size &&
662  {
663  e = force_reuse_arp_entry ();
664  if (NULL == e)
665  return -2;
666  }
667  else
668  pool_get (am->ip4_entry_pool, e);
669 
670  if (NULL == arp_int->arp_entries)
671  arp_int->arp_entries = hash_create (0, sizeof (u32));
672 
673  hash_set (arp_int->arp_entries, a->ip4.as_u32, e - am->ip4_entry_pool);
674 
676  e->ip4_address = a->ip4;
679  a->ethernet, sizeof (e->ethernet_address));
680 
681  if (!is_no_fib_entry)
682  {
683  arp_adj_fib_add (e,
685  (e->sw_if_index));
686  }
687  else
688  {
690  }
691  }
692  else
693  {
694  /*
695  * prevent a DoS attack from the data-plane that
696  * spams us with no-op updates to the MAC address
697  */
698  if (0 == memcmp (e->ethernet_address,
699  a->ethernet, sizeof (e->ethernet_address)))
700  {
702  goto check_customers;
703  }
704 
705  /* Update ethernet address. */
706  clib_memcpy_fast (e->ethernet_address, a->ethernet,
707  sizeof (e->ethernet_address));
708  }
709 
710  /* Update time stamp and flags. */
712  if (is_static)
713  {
716  }
717  else
718  {
721  }
722 
723  adj_nbr_walk_nh4 (sw_if_index, &e->ip4_address, arp_mk_complete_walk, e);
724 
725 check_customers:
726  /* Customer(s) waiting for this address to be resolved? */
727  p = hash_get (am->pending_resolutions_by_address, a->ip4.as_u32);
728  if (p)
729  {
730  u32 next_index;
731  next_index = p[0];
732 
733  while (next_index != (u32) ~ 0)
734  {
735  pr = pool_elt_at_index (am->pending_resolutions, next_index);
737  pr->type_opaque, pr->data);
738  next_index = pr->next_index;
739  pool_put (am->pending_resolutions, pr);
740  }
741 
742  hash_unset (am->pending_resolutions_by_address, a->ip4.as_u32);
743  }
744 
745  /* Customer(s) requesting ARP event for this address? */
746  p = hash_get (am->mac_changes_by_address, a->ip4.as_u32);
747  if (p)
748  {
749  u32 next_index;
750  next_index = p[0];
751 
752  while (next_index != (u32) ~ 0)
753  {
754  int (*fp) (u32, u8 *, u32, u32);
755  int rv = 1;
756  mc = pool_elt_at_index (am->mac_changes, next_index);
757  fp = mc->data_callback;
758 
759  /* Call the user's data callback, return 1 to suppress dup events */
760  if (fp)
761  rv = (*fp) (mc->data, a->ethernet, sw_if_index, 0);
762 
763  /*
764  * Signal the resolver process, as long as the user
765  * says they want to be notified
766  */
767  if (rv == 0)
769  mc->type_opaque, mc->data);
770  next_index = mc->next_index;
771  }
772  }
773 
774  return 0;
775 }
776 
777 void
779  void *address_arg,
780  uword node_index,
781  uword type_opaque, uword data)
782 {
784  ip4_address_t *address = address_arg;
785  uword *p;
787 
788  pool_get (am->pending_resolutions, pr);
789 
790  pr->next_index = ~0;
791  pr->node_index = node_index;
792  pr->type_opaque = type_opaque;
793  pr->data = data;
794  pr->data_callback = 0;
795 
796  p = hash_get (am->pending_resolutions_by_address, address->as_u32);
797  if (p)
798  {
799  /* Insert new resolution at the head of the list */
800  pr->next_index = p[0];
802  }
803 
805  pr - am->pending_resolutions);
806 }
807 
808 int
810  void *data_callback,
811  u32 pid,
812  void *address_arg,
813  uword node_index,
814  uword type_opaque, uword data, int is_add)
815 {
817  ip4_address_t *address = address_arg;
818 
819  /* Try to find an existing entry */
820  u32 *first = (u32 *) hash_get (am->mac_changes_by_address, address->as_u32);
821  u32 *p = first;
823  while (p && *p != ~0)
824  {
825  mc = pool_elt_at_index (am->mac_changes, *p);
826  if (mc->node_index == node_index && mc->type_opaque == type_opaque
827  && mc->pid == pid)
828  break;
829  p = &mc->next_index;
830  }
831 
832  int found = p && *p != ~0;
833  if (is_add)
834  {
835  if (found)
836  return VNET_API_ERROR_ENTRY_ALREADY_EXISTS;
837 
838  pool_get (am->mac_changes, mc);
839  *mc = (pending_resolution_t)
840  {
841  .next_index = ~0,.node_index = node_index,.type_opaque =
842  type_opaque,.data = data,.data_callback = data_callback,.pid =
843  pid,};
844 
845  /* Insert new resolution at the end of the list */
846  u32 new_idx = mc - am->mac_changes;
847  if (p)
848  p[0] = new_idx;
849  else
850  hash_set (am->mac_changes_by_address, address->as_u32, new_idx);
851  }
852  else
853  {
854  if (!found)
855  return VNET_API_ERROR_NO_SUCH_ENTRY;
856 
857  /* Clients may need to clean up pool entries, too */
858  void (*fp) (u32, u8 *) = data_callback;
859  if (fp)
860  (*fp) (mc->data, 0 /* no new mac addrs */ );
861 
862  /* Remove the entry from the list and delete the entry */
863  *p = mc->next_index;
864  pool_put (am->mac_changes, mc);
865 
866  /* Remove from hash if we deleted the last entry */
867  if (*p == ~0 && p == first)
868  hash_unset (am->mac_changes_by_address, address->as_u32);
869  }
870  return 0;
871 }
872 
873 /* Either we drop the packet or we send a reply to the sender. */
874 typedef enum
875 {
880 
881 #define foreach_ethernet_arp_error \
882  _ (replies_sent, "ARP replies sent") \
883  _ (l2_type_not_ethernet, "L2 type not ethernet") \
884  _ (l3_type_not_ip4, "L3 type not IP4") \
885  _ (l3_src_address_not_local, "IP4 source address not local to subnet") \
886  _ (l3_dst_address_not_local, "IP4 destination address not local to subnet") \
887  _ (l3_dst_address_unset, "IP4 destination address is unset") \
888  _ (l3_src_address_is_local, "IP4 source address matches local interface") \
889  _ (l3_src_address_learned, "ARP request IP4 source address learned") \
890  _ (replies_received, "ARP replies received") \
891  _ (opcode_not_request, "ARP opcode not request") \
892  _ (proxy_arp_replies_sent, "Proxy ARP replies sent") \
893  _ (l2_address_mismatch, "ARP hw addr does not match L2 frame src addr") \
894  _ (gratuitous_arp, "ARP probe or announcement dropped") \
895  _ (interface_no_table, "Interface is not mapped to an IP table") \
896  _ (interface_not_ip_enabled, "Interface is not IP enabled") \
897  _ (unnumbered_mismatch, "RX interface is unnumbered to different subnet") \
898 
899 typedef enum
900 {
901 #define _(sym,string) ETHERNET_ARP_ERROR_##sym,
903 #undef _
906 
907 static int
909  u32 input_sw_if_index, u32 conn_sw_if_index)
910 {
911  vnet_main_t *vnm = vnet_get_main ();
914 
915  /* verify that the input interface is unnumbered to the connected.
916  * the connected interface is the interface on which the subnet is
917  * configured */
918  si = &vim->sw_interfaces[input_sw_if_index];
919 
921  (si->unnumbered_sw_if_index == conn_sw_if_index)))
922  {
923  /* the input interface is not unnumbered to the interface on which
924  * the sub-net is configured that covers the ARP request.
925  * So this is not the case for unnumbered.. */
926  return 0;
927  }
928 
929  return !0;
930 }
931 
932 static u32
935  const ethernet_arp_ip4_over_ethernet_address_t * addr)
936 {
937  vnet_arp_set_ip4_over_ethernet (vnm, sw_if_index, addr, 0, 0);
938  return (ETHERNET_ARP_ERROR_l3_src_address_learned);
939 }
940 
941 static uword
943 {
945  vnet_main_t *vnm = vnet_get_main ();
946  ip4_main_t *im4 = &ip4_main;
947  u32 n_left_from, next_index, *from, *to_next;
948  u32 n_replies_sent = 0, n_proxy_arp_replies_sent = 0;
949 
950  from = vlib_frame_vector_args (frame);
951  n_left_from = frame->n_vectors;
952  next_index = node->cached_next_index;
953 
954  if (node->flags & VLIB_NODE_FLAG_TRACE)
955  vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
956  /* stride */ 1,
957  sizeof (ethernet_arp_input_trace_t));
958 
959  while (n_left_from > 0)
960  {
961  u32 n_left_to_next;
962 
963  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
964 
965  while (n_left_from > 0 && n_left_to_next > 0)
966  {
967  vlib_buffer_t *p0;
968  vnet_hw_interface_t *hw_if0;
969  ethernet_arp_header_t *arp0;
970  ethernet_header_t *eth_rx, *eth_tx;
971  const ip4_address_t *if_addr0;
972  ip4_address_t proxy_src;
973  u32 pi0, error0, next0, sw_if_index0, conn_sw_if_index0, fib_index0;
974  u8 is_request0, dst_is_local0, is_unnum0, is_vrrp_reply0;
976  fib_node_index_t dst_fei, src_fei;
977  const fib_prefix_t *pfx0;
978  fib_entry_flag_t src_flags, dst_flags;
979  u8 *rewrite0, rewrite0_len;
980 
981  pi0 = from[0];
982  to_next[0] = pi0;
983  from += 1;
984  to_next += 1;
985  n_left_from -= 1;
986  n_left_to_next -= 1;
987  pa = 0;
988 
989  p0 = vlib_get_buffer (vm, pi0);
990  arp0 = vlib_buffer_get_current (p0);
991  /* Fill in ethernet header. */
992  eth_rx = ethernet_buffer_get_header (p0);
993 
994  is_request0 = arp0->opcode
995  == clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_request);
996 
997  error0 = ETHERNET_ARP_ERROR_replies_sent;
998 
999  error0 =
1000  (arp0->l2_type !=
1001  clib_net_to_host_u16 (ETHERNET_ARP_HARDWARE_TYPE_ethernet) ?
1002  ETHERNET_ARP_ERROR_l2_type_not_ethernet : error0);
1003  error0 =
1004  (arp0->l3_type !=
1005  clib_net_to_host_u16 (ETHERNET_TYPE_IP4) ?
1006  ETHERNET_ARP_ERROR_l3_type_not_ip4 : error0);
1007  error0 =
1008  (0 == arp0->ip4_over_ethernet[0].ip4.as_u32 ?
1009  ETHERNET_ARP_ERROR_l3_dst_address_unset : error0);
1010 
1011  sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
1012 
1013  /* not playing the ARP game if the interface is not IPv4 enabled */
1014  error0 =
1015  (im4->ip_enabled_by_sw_if_index[sw_if_index0] == 0 ?
1016  ETHERNET_ARP_ERROR_interface_not_ip_enabled : error0);
1017 
1018  if (error0)
1019  goto drop2;
1020 
1021  /* Check that IP address is local and matches incoming interface. */
1022  fib_index0 = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);
1023  if (~0 == fib_index0)
1024  {
1025  error0 = ETHERNET_ARP_ERROR_interface_no_table;
1026  goto drop2;
1027 
1028  }
1029  dst_fei = ip4_fib_table_lookup (ip4_fib_get (fib_index0),
1030  &arp0->ip4_over_ethernet[1].ip4,
1031  32);
1032  dst_flags = fib_entry_get_flags (dst_fei);
1033 
1034  conn_sw_if_index0 = fib_entry_get_resolving_interface (dst_fei);
1035 
1036  /* Honor unnumbered interface, if any */
1037  is_unnum0 = sw_if_index0 != conn_sw_if_index0;
1038 
1039  {
1040  /*
1041  * we're looking for FIB entries that indicate the source
1042  * is attached. There may be more specific non-attached
1043  * routes that match the source, but these do not influence
1044  * whether we respond to an ARP request, i.e. they do not
1045  * influence whether we are the correct way for the sender
1046  * to reach us, they only affect how we reach the sender.
1047  */
1048  fib_entry_t *src_fib_entry;
1049  const fib_prefix_t *pfx;
1051  fib_source_t source;
1052  int attached;
1053  int mask;
1054 
1055  mask = 32;
1056  attached = 0;
1057 
1058  do
1059  {
1060  src_fei = ip4_fib_table_lookup (ip4_fib_get (fib_index0),
1061  &arp0->
1062  ip4_over_ethernet[0].ip4,
1063  mask);
1064  src_fib_entry = fib_entry_get (src_fei);
1065 
1066  /*
1067  * It's possible that the source that provides the
1068  * flags we need, or the flags we must not have,
1069  * is not the best source, so check then all.
1070  */
1071  /* *INDENT-OFF* */
1072  FOR_EACH_SRC_ADDED(src_fib_entry, src, source,
1073  ({
1074  src_flags = fib_entry_get_flags_for_source (src_fei, source);
1075 
1076  /* Reject requests/replies with our local interface
1077  address. */
1078  if (FIB_ENTRY_FLAG_LOCAL & src_flags)
1079  {
1080  error0 = ETHERNET_ARP_ERROR_l3_src_address_is_local;
1081  /*
1082  * When VPP has an interface whose address is also
1083  * applied to a TAP interface on the host, then VPP's
1084  * TAP interface will be unnumbered to the 'real'
1085  * interface and do proxy ARP from the host.
1086  * The curious aspect of this setup is that ARP requests
1087  * from the host will come from the VPP's own address.
1088  * So don't drop immediately here, instead go see if this
1089  * is a proxy ARP case.
1090  */
1091  goto drop1;
1092  }
1093  /* A Source must also be local to subnet of matching
1094  * interface address. */
1095  if ((FIB_ENTRY_FLAG_ATTACHED & src_flags) ||
1096  (FIB_ENTRY_FLAG_CONNECTED & src_flags))
1097  {
1098  attached = 1;
1099  break;
1100  }
1101  /*
1102  * else
1103  * The packet was sent from an address that is not
1104  * connected nor attached i.e. it is not from an
1105  * address that is covered by a link's sub-net,
1106  * nor is it a already learned host resp.
1107  */
1108  }));
1109  /* *INDENT-ON* */
1110 
1111  /*
1112  * shorter mask lookup for the next iteration.
1113  */
1114  pfx = fib_entry_get_prefix (src_fei);
1115  mask = pfx->fp_len - 1;
1116 
1117  /*
1118  * continue until we hit the default route or we find
1119  * the attached we are looking for. The most likely
1120  * outcome is we find the attached with the first source
1121  * on the first lookup.
1122  */
1123  }
1124  while (!attached &&
1126 
1127  if (!attached)
1128  {
1129  /*
1130  * the matching route is a not attached, i.e. it was
1131  * added as a result of routing, rather than interface/ARP
1132  * configuration. If the matching route is not a host route
1133  * (i.e. a /32)
1134  */
1135  error0 = ETHERNET_ARP_ERROR_l3_src_address_not_local;
1136  goto drop2;
1137  }
1138  }
1139 
1140  if (fib_entry_is_sourced (dst_fei, FIB_SOURCE_ADJ))
1141  {
1142  /*
1143  * We matched an adj-fib on ths source subnet (a /32 previously
1144  * added as a result of ARP). If this request is a gratuitous
1145  * ARP, then learn from it.
1146  * The check for matching an adj-fib, is to prevent hosts
1147  * from spamming us with gratuitous ARPS that might otherwise
1148  * blow our ARP cache
1149  */
1150  if (arp0->ip4_over_ethernet[0].ip4.as_u32 ==
1151  arp0->ip4_over_ethernet[1].ip4.as_u32)
1152  error0 = arp_learn (vnm, am, sw_if_index0,
1153  &arp0->ip4_over_ethernet[0]);
1154  goto drop2;
1155  }
1156  else if (!(FIB_ENTRY_FLAG_CONNECTED & dst_flags))
1157  {
1158  error0 = ETHERNET_ARP_ERROR_l3_dst_address_not_local;
1159  goto drop1;
1160  }
1161 
1162  if (sw_if_index0 != fib_entry_get_resolving_interface (src_fei))
1163  {
1164  /*
1165  * The interface the ARP was received on is not the interface
1166  * on which the covering prefix is configured. Maybe this is a
1167  * case for unnumbered.
1168  */
1169  is_unnum0 = 1;
1170  }
1171 
1172  dst_is_local0 = (FIB_ENTRY_FLAG_LOCAL & dst_flags);
1173  pfx0 = fib_entry_get_prefix (dst_fei);
1174  if_addr0 = &pfx0->fp_addr.ip4;
1175 
1176  is_vrrp_reply0 =
1177  ((arp0->opcode ==
1178  clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply))
1179  &&
1180  (!memcmp
1181  (arp0->ip4_over_ethernet[0].ethernet, vrrp_prefix,
1182  sizeof (vrrp_prefix))));
1183 
1184  /* Trash ARP packets whose ARP-level source addresses do not
1185  match their L2-frame-level source addresses, unless it's
1186  a reply from a VRRP virtual router */
1187  if (memcmp
1188  (eth_rx->src_address, arp0->ip4_over_ethernet[0].ethernet,
1189  sizeof (eth_rx->src_address)) && !is_vrrp_reply0)
1190  {
1191  error0 = ETHERNET_ARP_ERROR_l2_address_mismatch;
1192  goto drop2;
1193  }
1194 
1195  /* Learn or update sender's mapping only for replies to addresses
1196  * that are local to the subnet */
1197  if (arp0->opcode ==
1198  clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply))
1199  {
1200  if (dst_is_local0)
1201  error0 = arp_learn (vnm, am, sw_if_index0,
1202  &arp0->ip4_over_ethernet[0]);
1203  else
1204  /* a reply for a non-local destination could be a GARP.
1205  * GARPs for hosts we know were handled above, so this one
1206  * we drop */
1207  error0 = ETHERNET_ARP_ERROR_l3_dst_address_not_local;
1208 
1209  goto drop1;
1210  }
1211  else if (arp0->opcode ==
1212  clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_request) &&
1213  (dst_is_local0 == 0))
1214  {
1215  goto drop1;
1216  }
1217 
1218  send_reply:
1219  /* Send a reply.
1220  An adjacency to the sender is not always present,
1221  so we use the interface to build us a rewrite string
1222  which will contain all the necessary tags. */
1223  rewrite0 = ethernet_build_rewrite (vnm, sw_if_index0,
1224  VNET_LINK_ARP,
1225  eth_rx->src_address);
1226  rewrite0_len = vec_len (rewrite0);
1227 
1228  /* Figure out how much to rewind current data from adjacency. */
1229  vlib_buffer_advance (p0, -rewrite0_len);
1230  eth_tx = vlib_buffer_get_current (p0);
1231 
1232  vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
1233  hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
1234 
1235  /* Send reply back through input interface */
1236  vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
1237  next0 = ARP_INPUT_NEXT_REPLY_TX;
1238 
1239  arp0->opcode = clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply);
1240 
1241  arp0->ip4_over_ethernet[1] = arp0->ip4_over_ethernet[0];
1242 
1243  clib_memcpy_fast (arp0->ip4_over_ethernet[0].ethernet,
1244  hw_if0->hw_address, 6);
1245  clib_mem_unaligned (&arp0->ip4_over_ethernet[0].ip4.data_u32, u32) =
1246  if_addr0->data_u32;
1247 
1248  /* Hardware must be ethernet-like. */
1249  ASSERT (vec_len (hw_if0->hw_address) == 6);
1250 
1251  /* the rx nd tx ethernet headers wil overlap in the case
1252  * when we received a tagged VLAN=0 packet, but we are sending
1253  * back untagged */
1254  clib_memcpy_fast (eth_tx, rewrite0, vec_len (rewrite0));
1255  vec_free (rewrite0);
1256 
1257  if (NULL == pa)
1258  {
1259  if (is_unnum0)
1260  {
1261  if (!arp_unnumbered (p0, sw_if_index0, conn_sw_if_index0))
1262  {
1263  error0 = ETHERNET_ARP_ERROR_unnumbered_mismatch;
1264  goto drop2;
1265  }
1266  }
1267  }
1268 
1269  /* We are going to reply to this request, so, in the absence of
1270  errors, learn the sender */
1271  if (!error0)
1272  error0 = arp_learn (vnm, am, sw_if_index0,
1273  &arp0->ip4_over_ethernet[1]);
1274 
1275  vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1276  n_left_to_next, pi0, next0);
1277 
1278  n_replies_sent += 1;
1279  continue;
1280 
1281  drop1:
1282  if (arp0->ip4_over_ethernet[0].ip4.as_u32 ==
1283  arp0->ip4_over_ethernet[1].ip4.as_u32)
1284  {
1285  error0 = ETHERNET_ARP_ERROR_gratuitous_arp;
1286  goto drop2;
1287  }
1288  /* See if proxy arp is configured for the address */
1289  if (is_request0)
1290  {
1291  vnet_sw_interface_t *si;
1292  u32 this_addr = clib_net_to_host_u32
1293  (arp0->ip4_over_ethernet[1].ip4.as_u32);
1294  u32 fib_index0;
1295 
1296  si = vnet_get_sw_interface (vnm, sw_if_index0);
1297 
1299  goto drop2;
1300 
1301  fib_index0 = vec_elt (im4->fib_index_by_sw_if_index,
1302  sw_if_index0);
1303 
1304  vec_foreach (pa, am->proxy_arps)
1305  {
1306  u32 lo_addr = clib_net_to_host_u32 (pa->lo_addr.as_u32);
1307  u32 hi_addr = clib_net_to_host_u32 (pa->hi_addr.as_u32);
1308 
1309  /* an ARP request hit in the proxy-arp table? */
1310  if ((this_addr >= lo_addr && this_addr <= hi_addr) &&
1311  (fib_index0 == pa->fib_index))
1312  {
1313  proxy_src.as_u32 =
1314  arp0->ip4_over_ethernet[1].ip4.data_u32;
1315 
1316  /*
1317  * change the interface address to the proxied
1318  */
1319  if_addr0 = &proxy_src;
1320  is_unnum0 = 0;
1321  n_proxy_arp_replies_sent++;
1322  goto send_reply;
1323  }
1324  }
1325  }
1326 
1327  drop2:
1328 
1329  next0 = ARP_INPUT_NEXT_DROP;
1330  p0->error = node->errors[error0];
1331 
1332  vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1333  n_left_to_next, pi0, next0);
1334  }
1335 
1336  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1337  }
1338 
1339  vlib_error_count (vm, node->node_index,
1340  ETHERNET_ARP_ERROR_replies_sent,
1341  n_replies_sent - n_proxy_arp_replies_sent);
1342 
1343  vlib_error_count (vm, node->node_index,
1344  ETHERNET_ARP_ERROR_proxy_arp_replies_sent,
1345  n_proxy_arp_replies_sent);
1346  return frame->n_vectors;
1347 }
1348 
1349 static char *ethernet_arp_error_strings[] = {
1350 #define _(sym,string) string,
1352 #undef _
1353 };
1354 
1355 /* *INDENT-OFF* */
1357 {
1358  .function = arp_input,
1359  .name = "arp-input",
1360  .vector_size = sizeof (u32),
1361  .n_errors = ETHERNET_ARP_N_ERROR,
1362  .error_strings = ethernet_arp_error_strings,
1363  .n_next_nodes = ARP_INPUT_N_NEXT,
1364  .next_nodes = {
1365  [ARP_INPUT_NEXT_DROP] = "error-drop",
1366  [ARP_INPUT_NEXT_REPLY_TX] = "interface-output",
1367  },
1368  .format_buffer = format_ethernet_arp_header,
1369  .format_trace = format_ethernet_arp_input_trace,
1370 };
1371 /* *INDENT-ON* */
1372 
1373 static int
1374 ip4_arp_entry_sort (void *a1, void *a2)
1375 {
1376  ethernet_arp_ip4_entry_t *e1 = a1;
1377  ethernet_arp_ip4_entry_t *e2 = a2;
1378 
1379  int cmp;
1380  vnet_main_t *vnm = vnet_get_main ();
1381 
1382  cmp = vnet_sw_interface_compare (vnm, e1->sw_if_index, e2->sw_if_index);
1383  if (!cmp)
1384  cmp = ip4_address_compare (&e1->ip4_address, &e2->ip4_address);
1385  return cmp;
1386 }
1387 
1390 {
1392  return am->ip4_entry_pool;
1393 }
1394 
1397 {
1399  ethernet_arp_ip4_entry_t *n, *ns = 0;
1400 
1401  /* *INDENT-OFF* */
1402  pool_foreach (n, am->ip4_entry_pool, ({
1403  if (sw_if_index != ~0 && n->sw_if_index != sw_if_index)
1404  continue;
1405  vec_add1 (ns, n[0]);
1406  }));
1407  /* *INDENT-ON* */
1408 
1409  if (ns)
1411  return ns;
1412 }
1413 
1414 static clib_error_t *
1416  unformat_input_t * input, vlib_cli_command_t * cmd)
1417 {
1418  vnet_main_t *vnm = vnet_get_main ();
1420  ethernet_arp_ip4_entry_t *e, *es;
1422  clib_error_t *error = 0;
1423  u32 sw_if_index;
1424 
1425  /* Filter entries by interface if given. */
1426  sw_if_index = ~0;
1427  (void) unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index);
1428 
1429  es = ip4_neighbor_entries (sw_if_index);
1430  if (es)
1431  {
1432  vlib_cli_output (vm, "%U", format_ethernet_arp_ip4_entry, vnm, 0);
1433  vec_foreach (e, es)
1434  {
1435  vlib_cli_output (vm, "%U", format_ethernet_arp_ip4_entry, vnm, e);
1436  }
1437  vec_free (es);
1438  }
1439 
1440  if (vec_len (am->proxy_arps))
1441  {
1442  vlib_cli_output (vm, "Proxy arps enabled for:");
1443  vec_foreach (pa, am->proxy_arps)
1444  {
1445  vlib_cli_output (vm, "Fib_index %d %U - %U ",
1446  pa->fib_index,
1448  format_ip4_address, &pa->hi_addr);
1449  }
1450  }
1451 
1452  return error;
1453 }
1454 
1455 /*?
1456  * Display all the IPv4 ARP entries.
1457  *
1458  * @cliexpar
1459  * Example of how to display the IPv4 ARP table:
1460  * @cliexstart{show ip arp}
1461  * Time FIB IP4 Flags Ethernet Interface
1462  * 346.3028 0 6.1.1.3 de:ad:be:ef:ba:be GigabitEthernet2/0/0
1463  * 3077.4271 0 6.1.1.4 S de:ad:be:ef:ff:ff GigabitEthernet2/0/0
1464  * 2998.6409 1 6.2.2.3 de:ad:be:ef:00:01 GigabitEthernet2/0/0
1465  * Proxy arps enabled for:
1466  * Fib_index 0 6.0.0.1 - 6.0.0.11
1467  * @cliexend
1468  ?*/
1469 /* *INDENT-OFF* */
1470 VLIB_CLI_COMMAND (show_ip4_arp_command, static) = {
1471  .path = "show ip arp",
1472  .function = show_ip4_arp,
1473  .short_help = "show ip arp",
1474 };
1475 /* *INDENT-ON* */
1476 
1477 typedef struct
1478 {
1479  pg_edit_t l2_type, l3_type;
1480  pg_edit_t n_l2_address_bytes, n_l3_address_bytes;
1482  struct
1483  {
1486  } ip4_over_ethernet[2];
1488 
1489 static inline void
1491 {
1492  /* Initialize fields that are not bit fields in the IP header. */
1493 #define _(f) pg_edit_init (&p->f, ethernet_arp_header_t, f);
1494  _(l2_type);
1495  _(l3_type);
1496  _(n_l2_address_bytes);
1497  _(n_l3_address_bytes);
1498  _(opcode);
1499  _(ip4_over_ethernet[0].ethernet);
1500  _(ip4_over_ethernet[0].ip4);
1501  _(ip4_over_ethernet[1].ethernet);
1502  _(ip4_over_ethernet[1].ip4);
1503 #undef _
1504 }
1505 
1506 uword
1507 unformat_pg_arp_header (unformat_input_t * input, va_list * args)
1508 {
1509  pg_stream_t *s = va_arg (*args, pg_stream_t *);
1511  u32 group_index;
1512 
1513  p = pg_create_edit_group (s, sizeof (p[0]), sizeof (ethernet_arp_header_t),
1514  &group_index);
1516 
1517  /* Defaults. */
1518  pg_edit_set_fixed (&p->l2_type, ETHERNET_ARP_HARDWARE_TYPE_ethernet);
1519  pg_edit_set_fixed (&p->l3_type, ETHERNET_TYPE_IP4);
1522 
1523  if (!unformat (input, "%U: %U/%U -> %U/%U",
1534  {
1535  /* Free up any edits we may have added. */
1536  pg_free_edit_group (s);
1537  return 0;
1538  }
1539  return 1;
1540 }
1541 
1542 clib_error_t *
1544 {
1546 
1547  am->limit_arp_cache_size = arp_limit;
1548  return 0;
1549 }
1550 
1551 /**
1552  * @brief Control Plane hook to remove an ARP entry
1553  */
1554 int
1556  u32 sw_if_index,
1557  const
1558  ethernet_arp_ip4_over_ethernet_address_t *
1559  a)
1560 {
1562 
1563  args.sw_if_index = sw_if_index;
1565  clib_memcpy_fast (&args.a, a, sizeof (*a));
1566 
1568  (u8 *) & args, sizeof (args));
1569  return 0;
1570 }
1571 
1572 /**
1573  * @brief publish wildcard arp event
1574  * @param sw_if_index The interface on which the ARP entires are acted
1575  */
1576 static int
1578  const ethernet_arp_ip4_over_ethernet_address_t * a)
1579 {
1582  .sw_if_index = sw_if_index,
1583  .a = *a
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->ip4 = args->a.ip4.as_u32;
1606  r->sw_if_index = args->sw_if_index;
1607  memcpy (r->mac, args->a.ethernet, sizeof r->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->a.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  */
1650  {
1652  }
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  .a.ip4.as_u32 = e->ip4_address.as_u32,
1711  .sw_if_index = e->sw_if_index,
1712  .flags = ETHERNET_ARP_ARGS_FLUSH,
1713  };
1714  clib_memcpy_fast (&delme.a.ethernet, e->ethernet_address, 6);
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->a.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->a.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  .a.ip4.as_u32 = e->ip4_address.as_u32,
1920  .sw_if_index = e->sw_if_index,
1921  };
1922 
1923  clib_memcpy_fast (&update_me.a.ethernet, e->ethernet_address, 6);
1924 
1925  if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
1926  {
1927  update_me.flags = ETHERNET_ARP_ARGS_POPULATE;
1929  }
1930  else
1931  {
1932  update_me.flags = ETHERNET_ARP_ARGS_FLUSH;
1934  }
1935  }
1936  vec_free (to_update);
1937 
1938  return 0;
1939 }
1940 
1942 
1943 static void
1944 increment_ip4_and_mac_address (ethernet_arp_ip4_over_ethernet_address_t * a)
1945 {
1946  u8 old;
1947  int i;
1948 
1949  for (i = 3; i >= 0; i--)
1950  {
1951  old = a->ip4.as_u8[i];
1952  a->ip4.as_u8[i] += 1;
1953  if (old < a->ip4.as_u8[i])
1954  break;
1955  }
1956 
1957  for (i = 5; i >= 0; i--)
1958  {
1959  old = a->ethernet[i];
1960  a->ethernet[i] += 1;
1961  if (old < a->ethernet[i])
1962  break;
1963  }
1964 }
1965 
1966 int
1968  u32 sw_if_index,
1969  const ethernet_arp_ip4_over_ethernet_address_t
1970  * a, int is_static, int is_no_fib_entry)
1971 {
1973 
1974  args.sw_if_index = sw_if_index;
1975  args.is_static = is_static;
1976  args.is_no_fib_entry = is_no_fib_entry;
1977  args.flags = 0;
1978  clib_memcpy_fast (&args.a, a, sizeof (*a));
1979 
1981  (u8 *) & args, sizeof (args));
1982  return 0;
1983 }
1984 
1985 void
1987 {
1990 
1991  vec_foreach (pa, am->proxy_arps)
1992  {
1993  if (!cb (&pa->lo_addr, &pa->hi_addr, pa->fib_index, data))
1994  break;
1995  }
1996 }
1997 
1998 int
2000  ip4_address_t * hi_addr, u32 fib_index, int is_del)
2001 {
2004  u32 found_at_index = ~0;
2005 
2006  vec_foreach (pa, am->proxy_arps)
2007  {
2008  if (pa->lo_addr.as_u32 == lo_addr->as_u32 &&
2009  pa->hi_addr.as_u32 == hi_addr->as_u32 && pa->fib_index == fib_index)
2010  {
2011  found_at_index = pa - am->proxy_arps;
2012  break;
2013  }
2014  }
2015 
2016  if (found_at_index != ~0)
2017  {
2018  /* Delete, otherwise it's already in the table */
2019  if (is_del)
2020  vec_delete (am->proxy_arps, 1, found_at_index);
2021  return 0;
2022  }
2023  /* delete, no such entry */
2024  if (is_del)
2025  return VNET_API_ERROR_NO_SUCH_ENTRY;
2026 
2027  /* add, not in table */
2028  vec_add2 (am->proxy_arps, pa, 1);
2029  pa->lo_addr.as_u32 = lo_addr->as_u32;
2030  pa->hi_addr.as_u32 = hi_addr->as_u32;
2031  pa->fib_index = fib_index;
2032  return 0;
2033 }
2034 
2035 /*
2036  * Remove any proxy arp entries asdociated with the
2037  * specificed fib.
2038  */
2039 int
2041 {
2044  u32 *entries_to_delete = 0;
2045  u32 fib_index;
2046  int i;
2047 
2048  fib_index = fib_table_find (FIB_PROTOCOL_IP4, fib_id);
2049  if (~0 == fib_index)
2050  return VNET_API_ERROR_NO_SUCH_ENTRY;
2051 
2052  vec_foreach (pa, am->proxy_arps)
2053  {
2054  if (pa->fib_index == fib_index)
2055  {
2056  vec_add1 (entries_to_delete, pa - am->proxy_arps);
2057  }
2058  }
2059 
2060  for (i = 0; i < vec_len (entries_to_delete); i++)
2061  {
2062  vec_delete (am->proxy_arps, 1, entries_to_delete[i]);
2063  }
2064 
2065  vec_free (entries_to_delete);
2066 
2067  return 0;
2068 }
2069 
2070 static clib_error_t *
2072  unformat_input_t * input, vlib_cli_command_t * cmd)
2073 {
2074  vnet_main_t *vnm = vnet_get_main ();
2075  u32 sw_if_index;
2076  ethernet_arp_ip4_over_ethernet_address_t lo_addr, hi_addr, addr;
2077  int addr_valid = 0;
2078  int is_del = 0;
2079  int count = 1;
2080  u32 fib_index = 0;
2081  u32 fib_id;
2082  int is_static = 0;
2083  int is_no_fib_entry = 0;
2084  int is_proxy = 0;
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_ethernet_address, &addr.ethernet))
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  is_static = 1;
2100 
2101  else if (unformat (input, "no-fib-entry"))
2102  is_no_fib_entry = 1;
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 
2146  (vnm, sw_if_index, &addr, is_static, is_no_fib_entry);
2147 
2149  event_type = vlib_process_get_events (vm, &event_data);
2150  vec_reset_length (event_data);
2151  if (event_type != 1)
2152  clib_warning ("event type %d unexpected", event_type);
2153  }
2154  else
2155  vnet_arp_unset_ip4_over_ethernet (vnm, sw_if_index, &addr);
2156 
2158  }
2159  }
2160  else
2161  {
2162  return clib_error_return (0, "unknown input `%U'",
2163  format_unformat_error, input);
2164  }
2165 
2166  return 0;
2167 }
2168 
2169 /* *INDENT-OFF* */
2170 /*?
2171  * Add or delete IPv4 ARP cache entries.
2172  *
2173  * @note 'set ip arp' options (e.g. delete, static, 'fib-id <id>',
2174  * 'count <number>', 'interface ip4_addr mac_addr') can be added in
2175  * any order and combination.
2176  *
2177  * @cliexpar
2178  * @parblock
2179  * Add or delete IPv4 ARP cache entries as follows. MAC Address can be in
2180  * either aa:bb:cc:dd:ee:ff format or aabb.ccdd.eeff format.
2181  * @cliexcmd{set ip arp GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2182  * @cliexcmd{set ip arp delete GigabitEthernet2/0/0 6.0.0.3 de:ad:be:ef:ba:be}
2183  *
2184  * To add or delete an IPv4 ARP cache entry to or from a specific fib
2185  * table:
2186  * @cliexcmd{set ip arp fib-id 1 GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2187  * @cliexcmd{set ip arp fib-id 1 delete GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2188  *
2189  * Add or delete IPv4 static ARP cache entries as follows:
2190  * @cliexcmd{set ip arp static GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2191  * @cliexcmd{set ip arp static delete GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2192  *
2193  * For testing / debugging purposes, the 'set ip arp' command can add or
2194  * delete multiple entries. Supply the 'count N' parameter:
2195  * @cliexcmd{set ip arp count 10 GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2196  * @endparblock
2197  ?*/
2198 VLIB_CLI_COMMAND (ip_arp_add_del_command, static) = {
2199  .path = "set ip arp",
2200  .short_help =
2201  "set ip arp [del] <intfc> <ip-address> <mac-address> [static] [no-fib-entry] [count <count>] [fib-id <fib-id>] [proxy <lo-addr> - <hi-addr>]",
2202  .function = ip_arp_add_del_command_fn,
2203 };
2204 /* *INDENT-ON* */
2205 
2206 static clib_error_t *
2209  input, vlib_cli_command_t * cmd)
2210 {
2211  vnet_main_t *vnm = vnet_get_main ();
2212  u32 sw_if_index;
2213  vnet_sw_interface_t *si;
2214  int enable = 0;
2215  int intfc_set = 0;
2216 
2217  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2218  {
2219  if (unformat (input, "%U", unformat_vnet_sw_interface,
2220  vnm, &sw_if_index))
2221  intfc_set = 1;
2222  else if (unformat (input, "enable") || unformat (input, "on"))
2223  enable = 1;
2224  else if (unformat (input, "disable") || unformat (input, "off"))
2225  enable = 0;
2226  else
2227  break;
2228  }
2229 
2230  if (intfc_set == 0)
2231  return clib_error_return (0, "unknown input '%U'",
2232  format_unformat_error, input);
2233 
2234  si = vnet_get_sw_interface (vnm, sw_if_index);
2235  ASSERT (si);
2236  if (enable)
2238  else
2240 
2241  return 0;
2242 }
2243 
2244 /* *INDENT-OFF* */
2245 /*?
2246  * Enable proxy-arp on an interface. The vpp stack will answer ARP
2247  * requests for the indicated address range. Multiple proxy-arp
2248  * ranges may be provisioned.
2249  *
2250  * @note Proxy ARP as a technology is infamous for blackholing traffic.
2251  * Also, the underlying implementation has not been performance-tuned.
2252  * Avoid creating an unnecessarily large set of ranges.
2253  *
2254  * @cliexpar
2255  * To enable proxy arp on a range of addresses, use:
2256  * @cliexcmd{set ip arp proxy 6.0.0.1 - 6.0.0.11}
2257  * Append 'del' to delete a range of proxy ARP addresses:
2258  * @cliexcmd{set ip arp proxy 6.0.0.1 - 6.0.0.11 del}
2259  * You must then specifically enable proxy arp on individual interfaces:
2260  * @cliexcmd{set interface proxy-arp GigabitEthernet0/8/0 enable}
2261  * To disable proxy arp on an individual interface:
2262  * @cliexcmd{set interface proxy-arp GigabitEthernet0/8/0 disable}
2263  ?*/
2264 VLIB_CLI_COMMAND (set_int_proxy_enable_command, static) = {
2265  .path = "set interface proxy-arp",
2266  .short_help =
2267  "set interface proxy-arp <intfc> [enable|disable]",
2268  .function = set_int_proxy_arp_command_fn,
2269 };
2270 /* *INDENT-ON* */
2271 
2272 
2273 /*
2274  * ARP/ND Termination in a L2 Bridge Domain based on IP4/IP6 to MAC
2275  * hash tables mac_by_ip4 and mac_by_ip6 for each BD.
2276  */
2277 typedef enum
2278 {
2282 } arp_term_next_t;
2283 
2285 
2286 static uword
2288  vlib_node_runtime_t * node, vlib_frame_t * frame)
2289 {
2290  l2input_main_t *l2im = &l2input_main;
2291  u32 n_left_from, next_index, *from, *to_next;
2292  u32 n_replies_sent = 0;
2293  u16 last_bd_index = ~0;
2294  l2_bridge_domain_t *last_bd_config = 0;
2295  l2_input_config_t *cfg0;
2296 
2297  from = vlib_frame_vector_args (frame);
2298  n_left_from = frame->n_vectors;
2299  next_index = node->cached_next_index;
2300 
2301  while (n_left_from > 0)
2302  {
2303  u32 n_left_to_next;
2304 
2305  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2306 
2307  while (n_left_from > 0 && n_left_to_next > 0)
2308  {
2309  vlib_buffer_t *p0;
2310  ethernet_header_t *eth0;
2311  ethernet_arp_header_t *arp0;
2312  ip6_header_t *iph0;
2313  u8 *l3h0;
2314  u32 pi0, error0, next0, sw_if_index0;
2315  u16 ethertype0;
2316  u16 bd_index0;
2317  u32 ip0;
2318  u8 *macp0;
2319 
2320  pi0 = from[0];
2321  to_next[0] = pi0;
2322  from += 1;
2323  to_next += 1;
2324  n_left_from -= 1;
2325  n_left_to_next -= 1;
2326 
2327  p0 = vlib_get_buffer (vm, pi0);
2328  // Terminate only local (SHG == 0) ARP
2329  if (vnet_buffer (p0)->l2.shg != 0)
2330  goto next_l2_feature;
2331 
2332  eth0 = vlib_buffer_get_current (p0);
2333  l3h0 = (u8 *) eth0 + vnet_buffer (p0)->l2.l2_len;
2334  ethertype0 = clib_net_to_host_u16 (*(u16 *) (l3h0 - 2));
2335  arp0 = (ethernet_arp_header_t *) l3h0;
2336 
2337  if (ethertype0 != ETHERNET_TYPE_ARP)
2338  goto check_ip6_nd;
2339 
2340  if ((arp0->opcode !=
2341  clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_request)) &&
2342  (arp0->opcode !=
2343  clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply)))
2344  goto check_ip6_nd;
2345 
2346  /* Must be ARP request/reply packet here */
2347  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) &&
2348  (p0->flags & VLIB_BUFFER_IS_TRACED)))
2349  {
2350  u8 *t0 = vlib_add_trace (vm, node, p0,
2351  sizeof (ethernet_arp_input_trace_t));
2352  clib_memcpy_fast (t0, l3h0,
2353  sizeof (ethernet_arp_input_trace_t));
2354  }
2355 
2356  error0 = 0;
2357  error0 =
2358  (arp0->l2_type !=
2359  clib_net_to_host_u16 (ETHERNET_ARP_HARDWARE_TYPE_ethernet)
2360  ? ETHERNET_ARP_ERROR_l2_type_not_ethernet : error0);
2361  error0 =
2362  (arp0->l3_type !=
2363  clib_net_to_host_u16 (ETHERNET_TYPE_IP4) ?
2364  ETHERNET_ARP_ERROR_l3_type_not_ip4 : error0);
2365 
2366  sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
2367 
2368  if (error0)
2369  goto drop;
2370 
2371  /* Trash ARP packets whose ARP-level source addresses do not
2372  match, or if requester address is mcast */
2373  if (PREDICT_FALSE
2374  (memcmp (eth0->src_address, arp0->ip4_over_ethernet[0].ethernet,
2375  sizeof (eth0->src_address)) ||
2376  ethernet_address_cast (arp0->ip4_over_ethernet[0].ethernet)))
2377  {
2378  /* VRRP virtual MAC may be different to SMAC in ARP reply */
2379  if (memcmp (arp0->ip4_over_ethernet[0].ethernet, vrrp_prefix,
2380  sizeof (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 
2414  /* MAC found, send ARP reply -
2415  Convert ARP request packet to ARP reply */
2416  arp0->opcode = clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply);
2417  arp0->ip4_over_ethernet[1] = arp0->ip4_over_ethernet[0];
2418  arp0->ip4_over_ethernet[0].ip4.as_u32 = ip0;
2419  clib_memcpy_fast (arp0->ip4_over_ethernet[0].ethernet, macp0, 6);
2420  clib_memcpy_fast (eth0->dst_address, eth0->src_address, 6);
2421  clib_memcpy_fast (eth0->src_address, macp0, 6);
2422  n_replies_sent += 1;
2423 
2424  output_response:
2425  /* For BVI, need to use l2-fwd node to send ARP reply as
2426  l2-output node cannot output packet to BVI properly */
2427  cfg0 = vec_elt_at_index (l2im->configs, sw_if_index0);
2428  if (PREDICT_FALSE (cfg0->bvi))
2429  {
2430  vnet_buffer (p0)->l2.feature_bitmap |= L2INPUT_FEAT_FWD;
2431  vnet_buffer (p0)->sw_if_index[VLIB_RX] = 0;
2432  goto next_l2_feature;
2433  }
2434 
2435  /* Send ARP/ND reply back out input interface through l2-output */
2436  vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
2437  next0 = ARP_TERM_NEXT_L2_OUTPUT;
2438  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2439  to_next, n_left_to_next, pi0,
2440  next0);
2441  continue;
2442 
2443  check_ip6_nd:
2444  /* IP6 ND event notification or solicitation handling to generate
2445  local response instead of flooding */
2446  iph0 = (ip6_header_t *) l3h0;
2447  if (PREDICT_FALSE (ethertype0 == ETHERNET_TYPE_IP6 &&
2448  iph0->protocol == IP_PROTOCOL_ICMP6 &&
2450  (&iph0->src_address)))
2451  {
2452  sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
2453  if (vnet_ip6_nd_term
2454  (vm, node, p0, eth0, iph0, sw_if_index0,
2455  vnet_buffer (p0)->l2.bd_index))
2456  goto output_response;
2457  }
2458 
2459  next_l2_feature:
2460  {
2462  L2INPUT_FEAT_ARP_TERM);
2463  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2464  to_next, n_left_to_next,
2465  pi0, next0);
2466  continue;
2467  }
2468 
2469  drop:
2470  if (0 == arp0->ip4_over_ethernet[0].ip4.as_u32 ||
2471  (arp0->ip4_over_ethernet[0].ip4.as_u32 ==
2472  arp0->ip4_over_ethernet[1].ip4.as_u32))
2473  {
2474  error0 = ETHERNET_ARP_ERROR_gratuitous_arp;
2475  }
2476  next0 = ARP_TERM_NEXT_DROP;
2477  p0->error = node->errors[error0];
2478 
2479  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2480  to_next, n_left_to_next, pi0,
2481  next0);
2482  }
2483 
2484  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2485  }
2486 
2487  vlib_error_count (vm, node->node_index,
2488  ETHERNET_ARP_ERROR_replies_sent, n_replies_sent);
2489  return frame->n_vectors;
2490 }
2491 
2492 /* *INDENT-OFF* */
2494  .function = arp_term_l2bd,
2495  .name = "arp-term-l2bd",
2496  .vector_size = sizeof (u32),
2497  .n_errors = ETHERNET_ARP_N_ERROR,
2498  .error_strings = ethernet_arp_error_strings,
2499  .n_next_nodes = ARP_TERM_N_NEXT,
2500  .next_nodes = {
2501  [ARP_TERM_NEXT_L2_OUTPUT] = "l2-output",
2502  [ARP_TERM_NEXT_DROP] = "error-drop",
2503  },
2504  .format_buffer = format_ethernet_arp_header,
2505  .format_trace = format_arp_term_input_trace,
2506 };
2507 /* *INDENT-ON* */
2508 
2509 clib_error_t *
2511 {
2512  // Initialize the feature next-node indexes
2514  arp_term_l2bd_node.index,
2518  return 0;
2519 }
2520 
2522 
2523 void
2525 {
2526  if (e->sw_if_index == sw_if_index)
2527  {
2530  }
2531 }
2532 
2533 void
2535 {
2538  adj_index_t ai;
2539 
2540  /* *INDENT-OFF* */
2541  pool_foreach (e, am->ip4_entry_pool,
2542  ({
2543  change_arp_mac (sw_if_index, e);
2544  }));
2545  /* *INDENT-ON* */
2546 
2547  ai = adj_glean_get (FIB_PROTOCOL_IP4, sw_if_index);
2548 
2549  if (ADJ_INDEX_INVALID != ai)
2551 }
2552 
2553 void
2555 {
2556  ip4_main_t *i4m = &ip4_main;
2557  ip4_address_t *ip4_addr = ip4_interface_first_address (i4m, sw_if_index, 0);
2558 
2559  send_ip4_garp_w_addr (vm, ip4_addr, sw_if_index);
2560 }
2561 
2562 void
2564  const ip4_address_t * ip4_addr, u32 sw_if_index)
2565 {
2566  ip4_main_t *i4m = &ip4_main;
2567  vnet_main_t *vnm = vnet_get_main ();
2568  u8 *rewrite, rewrite_len;
2569  vnet_hw_interface_t *hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
2570 
2571  if (ip4_addr)
2572  {
2573  clib_warning ("Sending GARP for IP4 address %U on sw_if_idex %d",
2574  format_ip4_address, ip4_addr, sw_if_index);
2575 
2576  /* Form GARP packet for output - Gratuitous ARP is an ARP request packet
2577  where the interface IP/MAC pair is used for both source and request
2578  MAC/IP pairs in the request */
2579  u32 bi = 0;
2581  (vm, &i4m->ip4_arp_request_packet_template, &bi);
2582 
2583  if (!h)
2584  return;
2585 
2586  clib_memcpy_fast (h->ip4_over_ethernet[0].ethernet, hi->hw_address,
2587  sizeof (h->ip4_over_ethernet[0].ethernet));
2588  clib_memcpy_fast (h->ip4_over_ethernet[1].ethernet, hi->hw_address,
2589  sizeof (h->ip4_over_ethernet[1].ethernet));
2590  h->ip4_over_ethernet[0].ip4 = ip4_addr[0];
2591  h->ip4_over_ethernet[1].ip4 = ip4_addr[0];
2592 
2593  /* Setup MAC header with ARP Etype and broadcast DMAC */
2594  vlib_buffer_t *b = vlib_get_buffer (vm, bi);
2595  rewrite =
2596  ethernet_build_rewrite (vnm, sw_if_index, VNET_LINK_ARP,
2598  rewrite_len = vec_len (rewrite);
2599  vlib_buffer_advance (b, -rewrite_len);
2601  clib_memcpy_fast (e->dst_address, rewrite, rewrite_len);
2602  vec_free (rewrite);
2603 
2604  /* Send GARP packet out the specified interface */
2605  vnet_buffer (b)->sw_if_index[VLIB_RX] =
2606  vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index;
2608  u32 *to_next = vlib_frame_vector_args (f);
2609  to_next[0] = bi;
2610  f->n_vectors = 1;
2612  }
2613 }
2614 
2615 /*
2616  * Remove any arp entries asociated with the specificed interface
2617  */
2618 static clib_error_t *
2620 {
2621  if (!is_add && sw_if_index != ~0)
2622  {
2625  /* *INDENT-OFF* */
2626  pool_foreach (e, am->ip4_entry_pool, ({
2627  if (e->sw_if_index != sw_if_index)
2628  continue;
2629  vnet_arp_set_ip4_over_ethernet_rpc_args_t args = { .sw_if_index = sw_if_index,
2630  .a.ip4 = e->ip4_address };
2632  }));
2633  /* *INDENT-ON* */
2634  }
2635 
2636  return (NULL);
2637 }
2638 
2640 
2641 /*
2642  * fd.io coding-style-patch-verification: ON
2643  *
2644  * Local Variables:
2645  * eval: (c-set-style "gnu")
2646  * End:
2647  */
#define vec_validate(V, I)
Make sure vector is long enough for given index (no header, unspecified alignment) ...
Definition: vec.h:439
#define vnet_rewrite_one_header(rw0, p0, most_likely_size)
Definition: rewrite.h:277
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
#define pool_next_index(P, I)
Return next occupied pool index after i, useful for safe iteration.
Definition: pool.h:519
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:302
static uword arp_term_l2bd(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
Definition: arp.c:2287
#define hash_set(h, key, value)
Definition: hash.h:255
l2_input_config_t * configs
Definition: l2_input.h:61
struct pg_ethernet_arp_header_t::@118 ip4_over_ethernet[2]
u32 flags
Definition: vhost_user.h:115
vl_api_address_t src
Definition: vxlan_gbp.api:32
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:250
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:1555
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:1507
static void pg_ethernet_arp_header_init(pg_ethernet_arp_header_t *p)
Definition: arp.c:1490
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:1944
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:1415
vnet_interface_main_t interface_main
Definition: vnet.h:56
pending_resolution_t * pending_resolutions
Definition: arp.c:79
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
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:313
static f64 vlib_time_now(vlib_main_t *vm)
Definition: main.h:232
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:2524
static u8 * format_ethernet_arp_header(u8 *s, va_list *va)
Definition: arp.c:203
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:2207
clib_error_t * ip4_set_arp_limit(u32 arp_limit)
Definition: arp.c:1543
static uword arp_input(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
Definition: arp.c:942
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:525
word vnet_sw_interface_compare(vnet_main_t *vnm, uword sw_if_index0, uword sw_if_index1)
Definition: interface.c:1185
void arp_update_adjacency(vnet_main_t *vnm, u32 sw_if_index, u32 ai)
Definition: arp.c:447
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:162
#define vec_add2(V, P, N)
Add N elements to end of vector V, return pointer to new elements in P.
Definition: vec.h:564
int i
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:1479
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:1678
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:419
uword * opcode_by_name
Definition: arp.c:75
unformat_function_t unformat_vnet_sw_interface
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:493
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
pg_edit_t ethernet
Definition: arp.c:1484
ip6_address_t src_address
Definition: ip6_packet.h:378
unsigned char u8
Definition: types.h:56
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
void * data_callback
Definition: arp.c:68
#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:119
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:874
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:116
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:1480
union ip_adjacency_t_::@42 sub_type
u8 * format_ethernet_address(u8 *s, va_list *args)
Definition: format.c:44
void * vlib_packet_template_get_packet(vlib_main_t *vm, vlib_packet_template_t *t, u32 *bi_result)
Definition: buffer.c:688
#define pool_foreach(VAR, POOL, BODY)
Iterate through pool.
Definition: pool.h:490
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:136
#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:586
static uword ethernet_address_cast(u8 *a)
Definition: packet.h:67
pending_resolution_t * mac_changes
Definition: arp.c:83
u32 sw_if_index
Definition: vxlan_gbp.api:37
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:618
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:1374
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:1986
#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:181
#define clib_error_return(e, args...)
Definition: error.h:99
ethernet_arp_hardware_type_t
Definition: arp_packet.h:89
static u8 * format_ethernet_arp_input_trace(u8 *s, va_list *va)
Definition: arp.c:289
#define foreach_ethernet_arp_opcode
Definition: arp_packet.h:61
uword * pending_resolutions_by_address
Definition: arp.c:78
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:229
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
static ethernet_arp_ip4_entry_t * arp_entry_find(ethernet_arp_interface_t *eai, const ip4_address_t *addr)
Definition: arp.c:410
#define hash_create_string(elts, value_bytes)
Definition: hash.h:690
pg_edit_t l3_type
Definition: arp.c:1479
int vnet_arp_set_ip4_over_ethernet(vnet_main_t *vnm, u32 sw_if_index, const ethernet_arp_ip4_over_ethernet_address_t *a, int is_static, int is_no_fib_entry)
Definition: arp.c:1967
static adj_walk_rc_t arp_mk_complete_walk(adj_index_t ai, void *ctx)
Definition: arp.c:429
Per-interface ARP configuration and state.
Definition: arp.c:45
static heap_elt_t * first(heap_header_t *h)
Definition: heap.c:59
#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:511
static ethernet_header_t * ethernet_buffer_get_header(vlib_buffer_t *b)
Definition: ethernet.h:409
#define foreach_ethernet_arp_error
Definition: arp.c:881
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:386
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:65
u8 address_length
Definition: ip_types.api:37
#define ETHERNET_ARP_ARGS_FLUSH
Definition: arp.c:111
ip4_address_t ip4_address
Definition: arp_packet.h:153
long ctx[MAX_CONNS]
Definition: main.c:144
struct _unformat_input_t unformat_input_t
u32 sw_if_index
Definition: arp_packet.h:152
unsigned short u16
Definition: types.h:57
ethernet_arp_ip4_entry_t * ip4_neighbors_pool(void)
Definition: arp.c:1389
u8 ethernet_address[6]
Definition: arp_packet.h:155
void vlib_put_frame_to_node(vlib_main_t *vm, u32 to_node_index, vlib_frame_t *f)
Definition: main.c:190
static void * vlib_buffer_get_current(vlib_buffer_t *b)
Get pointer to current data to process.
Definition: buffer.h:214
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:706
ethernet_arp_interface_t * ethernet_arp_by_sw_if_index
Per interface state.
Definition: arp.c:92
u32 node_index
Node index.
Definition: node.h:518
static clib_error_t * ethernet_arp_init(vlib_main_t *vm)
Definition: arp.c:1760
#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:2619
ethernet_arp_opcode_t
Definition: arp_packet.h:96
vlib_error_t error
Error code for buffers to be enqueued to error handler.
Definition: buffer.h:139
u32 fib_entry_get_resolving_interface(fib_node_index_t entry_index)
Definition: fib_entry.c:1451
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:2071
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:544
ethernet_proxy_arp_t * proxy_arps
Definition: arp.c:95
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:2554
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:420
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:396
vlib_main_t * vm
Definition: buffer.c:301
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:1480
#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:101
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 char * ethernet_arp_error_strings[]
Definition: arp.c:1349
#define ETHERNET_ARP_ARGS_POPULATE
Definition: arp.c:112
#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:311
uword * mac_changes_by_address
Definition: arp.c:82
uword wc_ip4_arp_publisher_et
Definition: arp.c:98
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:562
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:452
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:778
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:60
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:1999
enum fib_entry_flag_t_ fib_entry_flag_t
static u8 * format_ethernet_arp_opcode(u8 *s, va_list *va)
Definition: arp.c:144
void send_ip4_garp_w_addr(vlib_main_t *vm, const ip4_address_t *ip4_addr, u32 sw_if_index)
Definition: arp.c:2563
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:1266
#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:2510
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:110
u16 cached_next_index
Next frame index that vector arguments were last enqueued to last time this node ran.
Definition: node.h:537
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:1577
uword unformat_ethernet_address(unformat_input_t *input, va_list *args)
Definition: format.c:233
#define ASSERT(truth)
u32 arp_term_next_node_index[32]
Definition: arp.c:2284
#define vec_delete(V, N, M)
Delete N elements starting at element M.
Definition: vec.h:788
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:46
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:282
u32 arp_delete_rotor
Definition: arp.c:88
static void vlib_buffer_advance(vlib_buffer_t *b, word l)
Advance current data pointer by the supplied (signed!) amount.
Definition: buffer.h:233
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
ethernet_arp_entry_flags_t flags
Definition: arp_packet.h:157
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:320
Definition: pg.h:94
ethernet_arp_ip4_over_ethernet_address_t a
Definition: arp.c:106
void ethernet_register_input_type(vlib_main_t *vm, ethernet_type_t type, u32 node_index)
Definition: node.c:2036
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:2493
uword * arp_entries
Hash table of ARP entries.
Definition: arp.c:51
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_packet.h:159
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:933
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:57
l2input_main_t l2input_main
Definition: l2_input.c:122
static vlib_node_registration_t arp_input_node
(constructor) VLIB_REGISTER_NODE (arp_input_node)
Definition: arp.c:1356
#define FIB_NODE_INDEX_INVALID
Definition: fib_types.h:31
int vnet_proxy_arp_fib_reset(u32 fib_id)
Definition: arp.c:2040
fib_node_index_t fib_entry_index
The index of the adj-fib entry created.
Definition: arp_packet.h:164
#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
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:984
#define ETHERNET_ARP_ARGS_WC_PUB
Definition: arp.c:113
static u8 * format_arp_term_input_trace(u8 *s, va_list *va)
Definition: arp.c:303
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:830
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:126
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:80
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:1481
ethernet_arp_input_error_t
Definition: arp.c:899
arp_term_next_t
Definition: arp.c:2277
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
u32 limit_arp_cache_size
Definition: arp.c:89
static uword ip6_address_is_unspecified(const ip6_address_t *a)
Definition: ip6_packet.h:305
ip4_address_t lo_addr
Definition: arp.c:56
#define vnet_buffer(b)
Definition: buffer.h:368
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:903
uword node_index
Definition: arp.c:64
#define vec_foreach(var, vec)
Vector iterator.
uword * mac_by_ip4
Definition: l2_bd.h:101
u16 flags
Copy of main node flags.
Definition: node.h:531
static int arp_unnumbered(vlib_buffer_t *p0, u32 input_sw_if_index, u32 conn_sw_if_index)
Definition: arp.c:908
ethernet_arp_ip4_entry_t * ip4_neighbor_entries(u32 sw_if_index)
Definition: arp.c:1396
uword wc_ip4_arp_publisher_node
Definition: arp.c:97
VNET_SW_INTERFACE_ADD_DEL_FUNCTION(vnet_arp_delete_sw_interface)
#define VLIB_NODE_FLAG_TRACE
Definition: node.h:326
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:117
static uword unformat_ethernet_arp_opcode_net_byte_order(unformat_input_t *input, va_list *args)
Definition: arp.c:190
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:2534
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:85
int vnet_add_del_ip4_arp_change_event(vnet_main_t *vnm, void *data_callback, u32 pid, void *address_arg, uword node_index, uword type_opaque, uword data, int is_add)
Definition: arp.c:809
static vlib_buffer_t * vlib_get_buffer(vlib_main_t *vm, u32 buffer_index)
Translate buffer index into buffer pointer.
Definition: buffer_funcs.h:62
struct ip_adjacency_t_::@42::@43 nbr
IP_LOOKUP_NEXT_ARP/IP_LOOKUP_NEXT_REWRITE.
Definition: pg.h:308
const u8 * ethernet_ip4_mcast_dst_addr(void)
Definition: interface.c:56
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_packet.h:150
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:439
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