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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 (h->ip4_over_ethernet[0].ethernet,
362  hi->hw_address, sizeof (h->ip4_over_ethernet[0].ethernet));
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,
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  * Ofset is 2 bytes into the MAC desintation 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  }
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 {
623  ethernet_arp_ip4_over_ethernet_address_t *a = &args->a;
625  int make_new_arp_cache_entry = 1;
626  uword *p;
627  pending_resolution_t *pr, *mc;
628  ethernet_arp_interface_t *arp_int;
629  int is_static = args->is_static;
630  u32 sw_if_index = args->sw_if_index;
631  int is_no_fib_entry = args->is_no_fib_entry;
632 
633  vec_validate (am->ethernet_arp_by_sw_if_index, sw_if_index);
634 
636 
637  if (NULL != arp_int->arp_entries)
638  {
639  p = hash_get (arp_int->arp_entries, a->ip4.as_u32);
640  if (p)
641  {
642  e = pool_elt_at_index (am->ip4_entry_pool, p[0]);
643 
644  /* Refuse to over-write static arp. */
645  if (!is_static && (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC))
646  {
647  /* if MAC address match, still check to send event */
648  if (0 == memcmp (e->ethernet_address,
649  a->ethernet, sizeof (e->ethernet_address)))
650  goto check_customers;
651  return -2;
652  }
653  make_new_arp_cache_entry = 0;
654  }
655  }
656 
657  if (make_new_arp_cache_entry)
658  {
659  if (am->limit_arp_cache_size &&
661  {
662  e = force_reuse_arp_entry ();
663  if (NULL == e)
664  return -2;
665  }
666  else
667  pool_get (am->ip4_entry_pool, e);
668 
669  if (NULL == arp_int->arp_entries)
670  arp_int->arp_entries = hash_create (0, sizeof (u32));
671 
672  hash_set (arp_int->arp_entries, a->ip4.as_u32, e - am->ip4_entry_pool);
673 
675  e->ip4_address = a->ip4;
678  a->ethernet, sizeof (e->ethernet_address));
679 
680  if (!is_no_fib_entry)
681  {
682  arp_adj_fib_add (e,
684  (e->sw_if_index));
685  }
686  else
687  {
689  }
690  }
691  else
692  {
693  /*
694  * prevent a DoS attack from the data-plane that
695  * spams us with no-op updates to the MAC address
696  */
697  if (0 == memcmp (e->ethernet_address,
698  a->ethernet, sizeof (e->ethernet_address)))
699  {
701  goto check_customers;
702  }
703 
704  /* Update ethernet address. */
705  clib_memcpy (e->ethernet_address, a->ethernet,
706  sizeof (e->ethernet_address));
707  }
708 
709  /* Update time stamp and flags. */
711  if (is_static)
712  {
715  }
716  else
717  {
720  }
721 
722  adj_nbr_walk_nh4 (sw_if_index, &e->ip4_address, arp_mk_complete_walk, e);
723 
724 check_customers:
725  /* Customer(s) waiting for this address to be resolved? */
726  p = hash_get (am->pending_resolutions_by_address, a->ip4.as_u32);
727  if (p)
728  {
729  u32 next_index;
730  next_index = p[0];
731 
732  while (next_index != (u32) ~ 0)
733  {
734  pr = pool_elt_at_index (am->pending_resolutions, next_index);
736  pr->type_opaque, pr->data);
737  next_index = pr->next_index;
738  pool_put (am->pending_resolutions, pr);
739  }
740 
741  hash_unset (am->pending_resolutions_by_address, a->ip4.as_u32);
742  }
743 
744  /* Customer(s) requesting ARP event for this address? */
745  p = hash_get (am->mac_changes_by_address, a->ip4.as_u32);
746  if (p)
747  {
748  u32 next_index;
749  next_index = p[0];
750 
751  while (next_index != (u32) ~ 0)
752  {
753  int (*fp) (u32, u8 *, u32, u32);
754  int rv = 1;
755  mc = pool_elt_at_index (am->mac_changes, next_index);
756  fp = mc->data_callback;
757 
758  /* Call the user's data callback, return 1 to suppress dup events */
759  if (fp)
760  rv = (*fp) (mc->data, a->ethernet, sw_if_index, 0);
761 
762  /*
763  * Signal the resolver process, as long as the user
764  * says they want to be notified
765  */
766  if (rv == 0)
768  mc->type_opaque, mc->data);
769  next_index = mc->next_index;
770  }
771  }
772 
773  return 0;
774 }
775 
776 void
778  void *address_arg,
779  uword node_index,
780  uword type_opaque, uword data)
781 {
783  ip4_address_t *address = address_arg;
784  uword *p;
786 
787  pool_get (am->pending_resolutions, pr);
788 
789  pr->next_index = ~0;
790  pr->node_index = node_index;
791  pr->type_opaque = type_opaque;
792  pr->data = data;
793  pr->data_callback = 0;
794 
795  p = hash_get (am->pending_resolutions_by_address, address->as_u32);
796  if (p)
797  {
798  /* Insert new resolution at the head of the list */
799  pr->next_index = p[0];
801  }
802 
804  pr - am->pending_resolutions);
805 }
806 
807 int
809  void *data_callback,
810  u32 pid,
811  void *address_arg,
812  uword node_index,
813  uword type_opaque, uword data, int is_add)
814 {
816  ip4_address_t *address = address_arg;
817 
818  /* Try to find an existing entry */
819  u32 *first = (u32 *) hash_get (am->mac_changes_by_address, address->as_u32);
820  u32 *p = first;
822  while (p && *p != ~0)
823  {
824  mc = pool_elt_at_index (am->mac_changes, *p);
825  if (mc->node_index == node_index && mc->type_opaque == type_opaque
826  && mc->pid == pid)
827  break;
828  p = &mc->next_index;
829  }
830 
831  int found = p && *p != ~0;
832  if (is_add)
833  {
834  if (found)
835  return VNET_API_ERROR_ENTRY_ALREADY_EXISTS;
836 
837  pool_get (am->mac_changes, mc);
838  *mc = (pending_resolution_t)
839  {
840  .next_index = ~0,.node_index = node_index,.type_opaque =
841  type_opaque,.data = data,.data_callback = data_callback,.pid =
842  pid,};
843 
844  /* Insert new resolution at the end of the list */
845  u32 new_idx = mc - am->mac_changes;
846  if (p)
847  p[0] = new_idx;
848  else
849  hash_set (am->mac_changes_by_address, address->as_u32, new_idx);
850  }
851  else
852  {
853  if (!found)
854  return VNET_API_ERROR_NO_SUCH_ENTRY;
855 
856  /* Clients may need to clean up pool entries, too */
857  void (*fp) (u32, u8 *) = data_callback;
858  if (fp)
859  (*fp) (mc->data, 0 /* no new mac addrs */ );
860 
861  /* Remove the entry from the list and delete the entry */
862  *p = mc->next_index;
863  pool_put (am->mac_changes, mc);
864 
865  /* Remove from hash if we deleted the last entry */
866  if (*p == ~0 && p == first)
867  hash_unset (am->mac_changes_by_address, address->as_u32);
868  }
869  return 0;
870 }
871 
872 /* Either we drop the packet or we send a reply to the sender. */
873 typedef enum
874 {
879 
880 #define foreach_ethernet_arp_error \
881  _ (replies_sent, "ARP replies sent") \
882  _ (l2_type_not_ethernet, "L2 type not ethernet") \
883  _ (l3_type_not_ip4, "L3 type not IP4") \
884  _ (l3_src_address_not_local, "IP4 source address not local to subnet") \
885  _ (l3_dst_address_not_local, "IP4 destination address not local to subnet") \
886  _ (l3_dst_address_unset, "IP4 destination address is unset") \
887  _ (l3_src_address_is_local, "IP4 source address matches local interface") \
888  _ (l3_src_address_learned, "ARP request IP4 source address learned") \
889  _ (replies_received, "ARP replies received") \
890  _ (opcode_not_request, "ARP opcode not request") \
891  _ (proxy_arp_replies_sent, "Proxy ARP replies sent") \
892  _ (l2_address_mismatch, "ARP hw addr does not match L2 frame src addr") \
893  _ (gratuitous_arp, "ARP probe or announcement dropped") \
894  _ (interface_no_table, "Interface is not mapped to an IP table") \
895  _ (interface_not_ip_enabled, "Interface is not IP enabled") \
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, 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].ethernet, 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 */
1185  if (memcmp
1186  (eth_rx->src_address, arp0->ip4_over_ethernet[0].ethernet,
1187  sizeof (eth_rx->src_address)) && !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 
1241  clib_memcpy (arp0->ip4_over_ethernet[0].ethernet,
1242  hw_if0->hw_address, 6);
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 (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  goto drop2;
1261  }
1262  }
1263 
1264  /* We are going to reply to this request, so, in the absence of
1265  errors, learn the sender */
1266  if (!error0)
1267  error0 = arp_learn (vnm, am, sw_if_index0,
1268  &arp0->ip4_over_ethernet[1]);
1269 
1270  vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1271  n_left_to_next, pi0, next0);
1272 
1273  n_replies_sent += 1;
1274  continue;
1275 
1276  drop1:
1277  if (arp0->ip4_over_ethernet[0].ip4.as_u32 ==
1278  arp0->ip4_over_ethernet[1].ip4.as_u32)
1279  {
1280  error0 = ETHERNET_ARP_ERROR_gratuitous_arp;
1281  goto drop2;
1282  }
1283  /* See if proxy arp is configured for the address */
1284  if (is_request0)
1285  {
1286  vnet_sw_interface_t *si;
1287  u32 this_addr = clib_net_to_host_u32
1288  (arp0->ip4_over_ethernet[1].ip4.as_u32);
1289  u32 fib_index0;
1290 
1291  si = vnet_get_sw_interface (vnm, sw_if_index0);
1292 
1294  goto drop2;
1295 
1296  fib_index0 = vec_elt (im4->fib_index_by_sw_if_index,
1297  sw_if_index0);
1298 
1299  vec_foreach (pa, am->proxy_arps)
1300  {
1301  u32 lo_addr = clib_net_to_host_u32 (pa->lo_addr.as_u32);
1302  u32 hi_addr = clib_net_to_host_u32 (pa->hi_addr.as_u32);
1303 
1304  /* an ARP request hit in the proxy-arp table? */
1305  if ((this_addr >= lo_addr && this_addr <= hi_addr) &&
1306  (fib_index0 == pa->fib_index))
1307  {
1308  proxy_src.as_u32 =
1309  arp0->ip4_over_ethernet[1].ip4.data_u32;
1310 
1311  /*
1312  * change the interface address to the proxied
1313  */
1314  if_addr0 = &proxy_src;
1315  is_unnum0 = 0;
1316  n_proxy_arp_replies_sent++;
1317  goto send_reply;
1318  }
1319  }
1320  }
1321 
1322  drop2:
1323 
1324  next0 = ARP_INPUT_NEXT_DROP;
1325  p0->error = node->errors[error0];
1326 
1327  vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1328  n_left_to_next, pi0, next0);
1329  }
1330 
1331  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1332  }
1333 
1334  vlib_error_count (vm, node->node_index,
1335  ETHERNET_ARP_ERROR_replies_sent,
1336  n_replies_sent - n_proxy_arp_replies_sent);
1337 
1338  vlib_error_count (vm, node->node_index,
1339  ETHERNET_ARP_ERROR_proxy_arp_replies_sent,
1340  n_proxy_arp_replies_sent);
1341  return frame->n_vectors;
1342 }
1343 
1344 static char *ethernet_arp_error_strings[] = {
1345 #define _(sym,string) string,
1347 #undef _
1348 };
1349 
1350 /* *INDENT-OFF* */
1352 {
1353  .function = arp_input,
1354  .name = "arp-input",
1355  .vector_size = sizeof (u32),
1356  .n_errors = ETHERNET_ARP_N_ERROR,
1357  .error_strings = ethernet_arp_error_strings,
1358  .n_next_nodes = ARP_INPUT_N_NEXT,
1359  .next_nodes = {
1360  [ARP_INPUT_NEXT_DROP] = "error-drop",
1361  [ARP_INPUT_NEXT_REPLY_TX] = "interface-output",
1362  },
1363  .format_buffer = format_ethernet_arp_header,
1364  .format_trace = format_ethernet_arp_input_trace,
1365 };
1366 /* *INDENT-ON* */
1367 
1368 static int
1369 ip4_arp_entry_sort (void *a1, void *a2)
1370 {
1371  ethernet_arp_ip4_entry_t *e1 = a1;
1372  ethernet_arp_ip4_entry_t *e2 = a2;
1373 
1374  int cmp;
1375  vnet_main_t *vnm = vnet_get_main ();
1376 
1377  cmp = vnet_sw_interface_compare (vnm, e1->sw_if_index, e2->sw_if_index);
1378  if (!cmp)
1379  cmp = ip4_address_compare (&e1->ip4_address, &e2->ip4_address);
1380  return cmp;
1381 }
1382 
1385 {
1387  return am->ip4_entry_pool;
1388 }
1389 
1392 {
1394  ethernet_arp_ip4_entry_t *n, *ns = 0;
1395 
1396  /* *INDENT-OFF* */
1397  pool_foreach (n, am->ip4_entry_pool, ({
1398  if (sw_if_index != ~0 && n->sw_if_index != sw_if_index)
1399  continue;
1400  vec_add1 (ns, n[0]);
1401  }));
1402  /* *INDENT-ON* */
1403 
1404  if (ns)
1406  return ns;
1407 }
1408 
1409 static clib_error_t *
1411  unformat_input_t * input, vlib_cli_command_t * cmd)
1412 {
1413  vnet_main_t *vnm = vnet_get_main ();
1415  ethernet_arp_ip4_entry_t *e, *es;
1417  clib_error_t *error = 0;
1418  u32 sw_if_index;
1419 
1420  /* Filter entries by interface if given. */
1421  sw_if_index = ~0;
1422  (void) unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index);
1423 
1424  es = ip4_neighbor_entries (sw_if_index);
1425  if (es)
1426  {
1427  vlib_cli_output (vm, "%U", format_ethernet_arp_ip4_entry, vnm, 0);
1428  vec_foreach (e, es)
1429  {
1430  vlib_cli_output (vm, "%U", format_ethernet_arp_ip4_entry, vnm, e);
1431  }
1432  vec_free (es);
1433  }
1434 
1435  if (vec_len (am->proxy_arps))
1436  {
1437  vlib_cli_output (vm, "Proxy arps enabled for:");
1438  vec_foreach (pa, am->proxy_arps)
1439  {
1440  vlib_cli_output (vm, "Fib_index %d %U - %U ",
1441  pa->fib_index,
1443  format_ip4_address, &pa->hi_addr);
1444  }
1445  }
1446 
1447  return error;
1448 }
1449 
1450 /*?
1451  * Display all the IPv4 ARP entries.
1452  *
1453  * @cliexpar
1454  * Example of how to display the IPv4 ARP table:
1455  * @cliexstart{show ip arp}
1456  * Time FIB IP4 Flags Ethernet Interface
1457  * 346.3028 0 6.1.1.3 de:ad:be:ef:ba:be GigabitEthernet2/0/0
1458  * 3077.4271 0 6.1.1.4 S de:ad:be:ef:ff:ff GigabitEthernet2/0/0
1459  * 2998.6409 1 6.2.2.3 de:ad:be:ef:00:01 GigabitEthernet2/0/0
1460  * Proxy arps enabled for:
1461  * Fib_index 0 6.0.0.1 - 6.0.0.11
1462  * @cliexend
1463  ?*/
1464 /* *INDENT-OFF* */
1465 VLIB_CLI_COMMAND (show_ip4_arp_command, static) = {
1466  .path = "show ip arp",
1467  .function = show_ip4_arp,
1468  .short_help = "show ip arp",
1469 };
1470 /* *INDENT-ON* */
1471 
1472 typedef struct
1473 {
1474  pg_edit_t l2_type, l3_type;
1475  pg_edit_t n_l2_address_bytes, n_l3_address_bytes;
1477  struct
1478  {
1481  } ip4_over_ethernet[2];
1483 
1484 static inline void
1486 {
1487  /* Initialize fields that are not bit fields in the IP header. */
1488 #define _(f) pg_edit_init (&p->f, ethernet_arp_header_t, f);
1489  _(l2_type);
1490  _(l3_type);
1491  _(n_l2_address_bytes);
1492  _(n_l3_address_bytes);
1493  _(opcode);
1494  _(ip4_over_ethernet[0].ethernet);
1495  _(ip4_over_ethernet[0].ip4);
1496  _(ip4_over_ethernet[1].ethernet);
1497  _(ip4_over_ethernet[1].ip4);
1498 #undef _
1499 }
1500 
1501 uword
1502 unformat_pg_arp_header (unformat_input_t * input, va_list * args)
1503 {
1504  pg_stream_t *s = va_arg (*args, pg_stream_t *);
1506  u32 group_index;
1507 
1508  p = pg_create_edit_group (s, sizeof (p[0]), sizeof (ethernet_arp_header_t),
1509  &group_index);
1511 
1512  /* Defaults. */
1513  pg_edit_set_fixed (&p->l2_type, ETHERNET_ARP_HARDWARE_TYPE_ethernet);
1514  pg_edit_set_fixed (&p->l3_type, ETHERNET_TYPE_IP4);
1517 
1518  if (!unformat (input, "%U: %U/%U -> %U/%U",
1529  {
1530  /* Free up any edits we may have added. */
1531  pg_free_edit_group (s);
1532  return 0;
1533  }
1534  return 1;
1535 }
1536 
1537 clib_error_t *
1539 {
1541 
1542  am->limit_arp_cache_size = arp_limit;
1543  return 0;
1544 }
1545 
1546 /**
1547  * @brief Control Plane hook to remove an ARP entry
1548  */
1549 int
1551  u32 sw_if_index,
1552  const
1553  ethernet_arp_ip4_over_ethernet_address_t *
1554  a)
1555 {
1557 
1558  args.sw_if_index = sw_if_index;
1560  clib_memcpy (&args.a, a, sizeof (*a));
1561 
1563  (u8 *) & args, sizeof (args));
1564  return 0;
1565 }
1566 
1567 /**
1568  * @brief publish wildcard arp event
1569  * @param sw_if_index The interface on which the ARP entires are acted
1570  */
1571 static int
1573  const ethernet_arp_ip4_over_ethernet_address_t * a)
1574 {
1577  .sw_if_index = sw_if_index,
1578  .a = *a
1579  };
1580 
1582  (u8 *) & args, sizeof (args));
1583  return 0;
1584 }
1585 
1586 static void
1589  args)
1590 {
1594  uword et = am->wc_ip4_arp_publisher_et;
1595 
1596  if (ni == (uword) ~ 0)
1597  return;
1598  wc_arp_report_t *r =
1599  vlib_process_signal_event_data (vm, ni, et, 1, sizeof *r);
1600  r->ip4 = args->a.ip4.as_u32;
1601  r->sw_if_index = args->sw_if_index;
1602  memcpy (r->mac, args->a.ethernet, sizeof r->mac);
1603 }
1604 
1605 void
1606 wc_arp_set_publisher_node (uword node_index, uword event_type)
1607 {
1609  am->wc_ip4_arp_publisher_node = node_index;
1610  am->wc_ip4_arp_publisher_et = event_type;
1611 }
1612 
1613 static void
1615 
1616 static int
1619  * args)
1620 {
1624 
1625  if (vec_len (am->ethernet_arp_by_sw_if_index) <= args->sw_if_index)
1626  return 0;
1627 
1628  eai = &am->ethernet_arp_by_sw_if_index[args->sw_if_index];
1629 
1630  e = arp_entry_find (eai, &args->a.ip4);
1631 
1632  if (NULL != e)
1633  {
1636 
1637  /*
1638  * The difference between flush and unset, is that an unset
1639  * means delete for static and dynamic entries. A flush
1640  * means delete only for dynamic. Flushing is what the DP
1641  * does in response to interface events. unset is only done
1642  * by the control plane.
1643  */
1645  {
1647  }
1649  {
1650  arp_entry_free (eai, e);
1651  }
1652  }
1653  return (0);
1654 }
1655 
1656 /*
1657  * arp_add_del_interface_address
1658  *
1659  * callback when an interface address is added or deleted
1660  */
1661 static void
1663  uword opaque,
1664  u32 sw_if_index,
1667  u32 if_address_index, u32 is_del)
1668 {
1669  /*
1670  * Flush the ARP cache of all entries covered by the address
1671  * that is being removed.
1672  */
1675 
1676  if (vec_len (am->ethernet_arp_by_sw_if_index) <= sw_if_index)
1677  return;
1678 
1679  if (is_del)
1680  {
1682  u32 i, *to_delete = 0;
1683  hash_pair_t *pair;
1684 
1686 
1687  /* *INDENT-OFF* */
1688  hash_foreach_pair (pair, eai->arp_entries,
1689  ({
1690  e = pool_elt_at_index(am->ip4_entry_pool,
1691  pair->value[0]);
1692  if (ip4_destination_matches_route (im, &e->ip4_address,
1693  address, address_length))
1694  {
1695  vec_add1 (to_delete, e - am->ip4_entry_pool);
1696  }
1697  }));
1698  /* *INDENT-ON* */
1699 
1700  for (i = 0; i < vec_len (to_delete); i++)
1701  {
1702  e = pool_elt_at_index (am->ip4_entry_pool, to_delete[i]);
1703 
1705  .a.ip4.as_u32 = e->ip4_address.as_u32,
1706  .sw_if_index = e->sw_if_index,
1707  .flags = ETHERNET_ARP_ARGS_FLUSH,
1708  };
1709  clib_memcpy (&delme.a.ethernet, e->ethernet_address, 6);
1710 
1712  &delme);
1713  }
1714 
1715  vec_free (to_delete);
1716  }
1717 }
1718 
1719 static void
1721  uword opaque,
1722  u32 sw_if_index, u32 new_fib_index, u32 old_fib_index)
1723 {
1727  hash_pair_t *pair;
1728 
1729  /*
1730  * the IP table that the interface is bound to has changed.
1731  * reinstall all the adj fibs.
1732  */
1733 
1734  if (vec_len (am->ethernet_arp_by_sw_if_index) <= sw_if_index)
1735  return;
1736 
1738 
1739  /* *INDENT-OFF* */
1740  hash_foreach_pair (pair, eai->arp_entries,
1741  ({
1742  e = pool_elt_at_index(am->ip4_entry_pool,
1743  pair->value[0]);
1744  /*
1745  * remove the adj-fib from the old table and add to the new
1746  */
1747  arp_adj_fib_remove(e, old_fib_index);
1748  arp_adj_fib_add(e, new_fib_index);
1749  }));
1750  /* *INDENT-ON* */
1751 
1752 }
1753 
1754 static clib_error_t *
1756 {
1758  ip4_main_t *im = &ip4_main;
1759  clib_error_t *error;
1760  pg_node_t *pn;
1761 
1762  if ((error = vlib_call_init_function (vm, ethernet_init)))
1763  return error;
1764 
1765  ethernet_register_input_type (vm, ETHERNET_TYPE_ARP, arp_input_node.index);
1766 
1767  pn = pg_get_node (arp_input_node.index);
1769 
1770  am->opcode_by_name = hash_create_string (0, sizeof (uword));
1771 #define _(o) hash_set_mem (am->opcode_by_name, #o, ETHERNET_ARP_OPCODE_##o);
1773 #undef _
1774 
1775  /* $$$ configurable */
1776  am->limit_arp_cache_size = 50000;
1777 
1778  am->pending_resolutions_by_address = hash_create (0, sizeof (uword));
1779  am->mac_changes_by_address = hash_create (0, sizeof (uword));
1780  am->wc_ip4_arp_publisher_node = (uword) ~ 0;
1781 
1782  /* don't trace ARP error packets */
1783  {
1784  vlib_node_runtime_t *rt =
1786 
1787 #define _(a,b) \
1788  vnet_pcap_drop_trace_filter_add_del \
1789  (rt->errors[ETHERNET_ARP_ERROR_##a], \
1790  1 /* is_add */);
1792 #undef _
1793  }
1794 
1797  cb.function_opaque = 0;
1799 
1801  cbt.function = arp_table_bind;
1802  cbt.function_opaque = 0;
1803  vec_add1 (im->table_bind_callbacks, cbt);
1804 
1805  return 0;
1806 }
1807 
1809 
1810 static void
1812 {
1814 
1818  pool_put (am->ip4_entry_pool, e);
1819 }
1820 
1821 static inline int
1824  * args)
1825 {
1829 
1830  if (vec_len (am->ethernet_arp_by_sw_if_index) <= args->sw_if_index)
1831  return 0;
1832 
1833  eai = &am->ethernet_arp_by_sw_if_index[args->sw_if_index];
1834 
1835  e = arp_entry_find (eai, &args->a.ip4);
1836 
1837  if (NULL != e)
1838  {
1841  arp_entry_free (eai, e);
1842  }
1843 
1844  return 0;
1845 }
1846 
1847 
1848 static int
1851  * args)
1852 {
1856 
1858  eai = &am->ethernet_arp_by_sw_if_index[args->sw_if_index];
1859 
1860  e = arp_entry_find (eai, &args->a.ip4);
1861 
1862  if (NULL != e)
1863  {
1866  }
1867  return (0);
1868 }
1869 
1870 static void
1872  * a)
1873 {
1875  ASSERT (vlib_get_thread_index () == 0);
1876 
1879  else if (a->flags & ETHERNET_ARP_ARGS_FLUSH)
1881  else if (a->flags & ETHERNET_ARP_ARGS_POPULATE)
1883  else if (a->flags & ETHERNET_ARP_ARGS_WC_PUB)
1885  else
1887 }
1888 
1889 /**
1890  * @brief Invoked when the interface's admin state changes
1891  */
1892 static clib_error_t *
1895 {
1898  u32 i, *to_update = 0;
1899 
1900  /* *INDENT-OFF* */
1901  pool_foreach (e, am->ip4_entry_pool,
1902  ({
1903  if (e->sw_if_index == sw_if_index)
1904  vec_add1 (to_update,
1905  e - am->ip4_entry_pool);
1906  }));
1907  /* *INDENT-ON* */
1908 
1909  for (i = 0; i < vec_len (to_update); i++)
1910  {
1911  e = pool_elt_at_index (am->ip4_entry_pool, to_update[i]);
1912 
1914  .a.ip4.as_u32 = e->ip4_address.as_u32,
1915  .sw_if_index = e->sw_if_index,
1916  };
1917 
1918  clib_memcpy (&update_me.a.ethernet, e->ethernet_address, 6);
1919 
1920  if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
1921  {
1922  update_me.flags = ETHERNET_ARP_ARGS_POPULATE;
1924  }
1925  else
1926  {
1927  update_me.flags = ETHERNET_ARP_ARGS_FLUSH;
1929  }
1930  }
1931  vec_free (to_update);
1932 
1933  return 0;
1934 }
1935 
1937 
1938 static void
1939 increment_ip4_and_mac_address (ethernet_arp_ip4_over_ethernet_address_t * a)
1940 {
1941  u8 old;
1942  int i;
1943 
1944  for (i = 3; i >= 0; i--)
1945  {
1946  old = a->ip4.as_u8[i];
1947  a->ip4.as_u8[i] += 1;
1948  if (old < a->ip4.as_u8[i])
1949  break;
1950  }
1951 
1952  for (i = 5; i >= 0; i--)
1953  {
1954  old = a->ethernet[i];
1955  a->ethernet[i] += 1;
1956  if (old < a->ethernet[i])
1957  break;
1958  }
1959 }
1960 
1961 int
1963  u32 sw_if_index,
1964  const ethernet_arp_ip4_over_ethernet_address_t
1965  * a, int is_static, int is_no_fib_entry)
1966 {
1968 
1969  args.sw_if_index = sw_if_index;
1970  args.is_static = is_static;
1971  args.is_no_fib_entry = is_no_fib_entry;
1972  args.flags = 0;
1973  clib_memcpy (&args.a, a, sizeof (*a));
1974 
1976  (u8 *) & args, sizeof (args));
1977  return 0;
1978 }
1979 
1980 void
1982 {
1985 
1986  vec_foreach (pa, am->proxy_arps)
1987  {
1988  if (!cb (&pa->lo_addr, &pa->hi_addr, pa->fib_index, data))
1989  break;
1990  }
1991 }
1992 
1993 int
1995  ip4_address_t * hi_addr, u32 fib_index, int is_del)
1996 {
1999  u32 found_at_index = ~0;
2000 
2001  vec_foreach (pa, am->proxy_arps)
2002  {
2003  if (pa->lo_addr.as_u32 == lo_addr->as_u32 &&
2004  pa->hi_addr.as_u32 == hi_addr->as_u32 && pa->fib_index == fib_index)
2005  {
2006  found_at_index = pa - am->proxy_arps;
2007  break;
2008  }
2009  }
2010 
2011  if (found_at_index != ~0)
2012  {
2013  /* Delete, otherwise it's already in the table */
2014  if (is_del)
2015  vec_delete (am->proxy_arps, 1, found_at_index);
2016  return 0;
2017  }
2018  /* delete, no such entry */
2019  if (is_del)
2020  return VNET_API_ERROR_NO_SUCH_ENTRY;
2021 
2022  /* add, not in table */
2023  vec_add2 (am->proxy_arps, pa, 1);
2024  pa->lo_addr.as_u32 = lo_addr->as_u32;
2025  pa->hi_addr.as_u32 = hi_addr->as_u32;
2026  pa->fib_index = fib_index;
2027  return 0;
2028 }
2029 
2030 /*
2031  * Remove any proxy arp entries asdociated with the
2032  * specificed fib.
2033  */
2034 int
2036 {
2039  u32 *entries_to_delete = 0;
2040  u32 fib_index;
2041  int i;
2042 
2043  fib_index = fib_table_find (FIB_PROTOCOL_IP4, fib_id);
2044  if (~0 == fib_index)
2045  return VNET_API_ERROR_NO_SUCH_ENTRY;
2046 
2047  vec_foreach (pa, am->proxy_arps)
2048  {
2049  if (pa->fib_index == fib_index)
2050  {
2051  vec_add1 (entries_to_delete, pa - am->proxy_arps);
2052  }
2053  }
2054 
2055  for (i = 0; i < vec_len (entries_to_delete); i++)
2056  {
2057  vec_delete (am->proxy_arps, 1, entries_to_delete[i]);
2058  }
2059 
2060  vec_free (entries_to_delete);
2061 
2062  return 0;
2063 }
2064 
2065 static clib_error_t *
2067  unformat_input_t * input, vlib_cli_command_t * cmd)
2068 {
2069  vnet_main_t *vnm = vnet_get_main ();
2070  u32 sw_if_index;
2071  ethernet_arp_ip4_over_ethernet_address_t lo_addr, hi_addr, addr;
2072  int addr_valid = 0;
2073  int is_del = 0;
2074  int count = 1;
2075  u32 fib_index = 0;
2076  u32 fib_id;
2077  int is_static = 0;
2078  int is_no_fib_entry = 0;
2079  int is_proxy = 0;
2080 
2081  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2082  {
2083  /* set ip arp TenGigE1/1/0/1 1.2.3.4 aa:bb:... or aabb.ccdd... */
2084  if (unformat (input, "%U %U %U",
2085  unformat_vnet_sw_interface, vnm, &sw_if_index,
2086  unformat_ip4_address, &addr.ip4,
2087  unformat_ethernet_address, &addr.ethernet))
2088  addr_valid = 1;
2089 
2090  else if (unformat (input, "delete") || unformat (input, "del"))
2091  is_del = 1;
2092 
2093  else if (unformat (input, "static"))
2094  is_static = 1;
2095 
2096  else if (unformat (input, "no-fib-entry"))
2097  is_no_fib_entry = 1;
2098 
2099  else if (unformat (input, "count %d", &count))
2100  ;
2101 
2102  else if (unformat (input, "fib-id %d", &fib_id))
2103  {
2104  fib_index = fib_table_find (FIB_PROTOCOL_IP4, fib_id);
2105 
2106  if (~0 == fib_index)
2107  return clib_error_return (0, "fib ID %d doesn't exist\n", fib_id);
2108  }
2109 
2110  else if (unformat (input, "proxy %U - %U",
2111  unformat_ip4_address, &lo_addr.ip4,
2112  unformat_ip4_address, &hi_addr.ip4))
2113  is_proxy = 1;
2114  else
2115  break;
2116  }
2117 
2118  if (is_proxy)
2119  {
2120  (void) vnet_proxy_arp_add_del (&lo_addr.ip4, &hi_addr.ip4,
2121  fib_index, is_del);
2122  return 0;
2123  }
2124 
2125  if (addr_valid)
2126  {
2127  int i;
2128 
2129  for (i = 0; i < count; i++)
2130  {
2131  if (is_del == 0)
2132  {
2133  uword event_type, *event_data = 0;
2134 
2135  /* Park the debug CLI until the arp entry is installed */
2137  (vnm, &addr.ip4, vlib_current_process (vm),
2138  1 /* type */ , 0 /* data */ );
2139 
2141  (vnm, sw_if_index, &addr, is_static, is_no_fib_entry);
2142 
2144  event_type = vlib_process_get_events (vm, &event_data);
2145  vec_reset_length (event_data);
2146  if (event_type != 1)
2147  clib_warning ("event type %d unexpected", event_type);
2148  }
2149  else
2150  vnet_arp_unset_ip4_over_ethernet (vnm, sw_if_index, &addr);
2151 
2153  }
2154  }
2155  else
2156  {
2157  return clib_error_return (0, "unknown input `%U'",
2158  format_unformat_error, input);
2159  }
2160 
2161  return 0;
2162 }
2163 
2164 /* *INDENT-OFF* */
2165 /*?
2166  * Add or delete IPv4 ARP cache entries.
2167  *
2168  * @note 'set ip arp' options (e.g. delete, static, 'fib-id <id>',
2169  * 'count <number>', 'interface ip4_addr mac_addr') can be added in
2170  * any order and combination.
2171  *
2172  * @cliexpar
2173  * @parblock
2174  * Add or delete IPv4 ARP cache entries as follows. MAC Address can be in
2175  * either aa:bb:cc:dd:ee:ff format or aabb.ccdd.eeff format.
2176  * @cliexcmd{set ip arp GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2177  * @cliexcmd{set ip arp delete GigabitEthernet2/0/0 6.0.0.3 de:ad:be:ef:ba:be}
2178  *
2179  * To add or delete an IPv4 ARP cache entry to or from a specific fib
2180  * table:
2181  * @cliexcmd{set ip arp fib-id 1 GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2182  * @cliexcmd{set ip arp fib-id 1 delete GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2183  *
2184  * Add or delete IPv4 static ARP cache entries as follows:
2185  * @cliexcmd{set ip arp static GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2186  * @cliexcmd{set ip arp static delete GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2187  *
2188  * For testing / debugging purposes, the 'set ip arp' command can add or
2189  * delete multiple entries. Supply the 'count N' parameter:
2190  * @cliexcmd{set ip arp count 10 GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2191  * @endparblock
2192  ?*/
2193 VLIB_CLI_COMMAND (ip_arp_add_del_command, static) = {
2194  .path = "set ip arp",
2195  .short_help =
2196  "set ip arp [del] <intfc> <ip-address> <mac-address> [static] [no-fib-entry] [count <count>] [fib-id <fib-id>] [proxy <lo-addr> - <hi-addr>]",
2197  .function = ip_arp_add_del_command_fn,
2198 };
2199 /* *INDENT-ON* */
2200 
2201 static clib_error_t *
2204  input, vlib_cli_command_t * cmd)
2205 {
2206  vnet_main_t *vnm = vnet_get_main ();
2207  u32 sw_if_index;
2208  vnet_sw_interface_t *si;
2209  int enable = 0;
2210  int intfc_set = 0;
2211 
2212  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2213  {
2214  if (unformat (input, "%U", unformat_vnet_sw_interface,
2215  vnm, &sw_if_index))
2216  intfc_set = 1;
2217  else if (unformat (input, "enable") || unformat (input, "on"))
2218  enable = 1;
2219  else if (unformat (input, "disable") || unformat (input, "off"))
2220  enable = 0;
2221  else
2222  break;
2223  }
2224 
2225  if (intfc_set == 0)
2226  return clib_error_return (0, "unknown input '%U'",
2227  format_unformat_error, input);
2228 
2229  si = vnet_get_sw_interface (vnm, sw_if_index);
2230  ASSERT (si);
2231  if (enable)
2233  else
2235 
2236  return 0;
2237 }
2238 
2239 /* *INDENT-OFF* */
2240 /*?
2241  * Enable proxy-arp on an interface. The vpp stack will answer ARP
2242  * requests for the indicated address range. Multiple proxy-arp
2243  * ranges may be provisioned.
2244  *
2245  * @note Proxy ARP as a technology is infamous for blackholing traffic.
2246  * Also, the underlying implementation has not been performance-tuned.
2247  * Avoid creating an unnecessarily large set of ranges.
2248  *
2249  * @cliexpar
2250  * To enable proxy arp on a range of addresses, use:
2251  * @cliexcmd{set ip arp proxy 6.0.0.1 - 6.0.0.11}
2252  * Append 'del' to delete a range of proxy ARP addresses:
2253  * @cliexcmd{set ip arp proxy 6.0.0.1 - 6.0.0.11 del}
2254  * You must then specifically enable proxy arp on individual interfaces:
2255  * @cliexcmd{set interface proxy-arp GigabitEthernet0/8/0 enable}
2256  * To disable proxy arp on an individual interface:
2257  * @cliexcmd{set interface proxy-arp GigabitEthernet0/8/0 disable}
2258  ?*/
2259 VLIB_CLI_COMMAND (set_int_proxy_enable_command, static) = {
2260  .path = "set interface proxy-arp",
2261  .short_help =
2262  "set interface proxy-arp <intfc> [enable|disable]",
2263  .function = set_int_proxy_arp_command_fn,
2264 };
2265 /* *INDENT-ON* */
2266 
2267 
2268 /*
2269  * ARP/ND Termination in a L2 Bridge Domain based on IP4/IP6 to MAC
2270  * hash tables mac_by_ip4 and mac_by_ip6 for each BD.
2271  */
2272 typedef enum
2273 {
2277 } arp_term_next_t;
2278 
2280 
2281 static uword
2283  vlib_node_runtime_t * node, vlib_frame_t * frame)
2284 {
2285  l2input_main_t *l2im = &l2input_main;
2286  u32 n_left_from, next_index, *from, *to_next;
2287  u32 n_replies_sent = 0;
2288  u16 last_bd_index = ~0;
2289  l2_bridge_domain_t *last_bd_config = 0;
2290  l2_input_config_t *cfg0;
2291 
2292  from = vlib_frame_vector_args (frame);
2293  n_left_from = frame->n_vectors;
2294  next_index = node->cached_next_index;
2295 
2296  while (n_left_from > 0)
2297  {
2298  u32 n_left_to_next;
2299 
2300  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2301 
2302  while (n_left_from > 0 && n_left_to_next > 0)
2303  {
2304  vlib_buffer_t *p0;
2305  ethernet_header_t *eth0;
2306  ethernet_arp_header_t *arp0;
2307  ip6_header_t *iph0;
2308  u8 *l3h0;
2309  u32 pi0, error0, next0, sw_if_index0;
2310  u16 ethertype0;
2311  u16 bd_index0;
2312  u32 ip0;
2313  u8 *macp0;
2314 
2315  pi0 = from[0];
2316  to_next[0] = pi0;
2317  from += 1;
2318  to_next += 1;
2319  n_left_from -= 1;
2320  n_left_to_next -= 1;
2321 
2322  p0 = vlib_get_buffer (vm, pi0);
2323  // Terminate only local (SHG == 0) ARP
2324  if (vnet_buffer (p0)->l2.shg != 0)
2325  goto next_l2_feature;
2326 
2327  eth0 = vlib_buffer_get_current (p0);
2328  l3h0 = (u8 *) eth0 + vnet_buffer (p0)->l2.l2_len;
2329  ethertype0 = clib_net_to_host_u16 (*(u16 *) (l3h0 - 2));
2330  arp0 = (ethernet_arp_header_t *) l3h0;
2331 
2332  if (ethertype0 != ETHERNET_TYPE_ARP)
2333  goto check_ip6_nd;
2334 
2335  if ((arp0->opcode !=
2336  clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_request)) &&
2337  (arp0->opcode !=
2338  clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply)))
2339  goto check_ip6_nd;
2340 
2341  /* Must be ARP request/reply packet here */
2342  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) &&
2343  (p0->flags & VLIB_BUFFER_IS_TRACED)))
2344  {
2345  u8 *t0 = vlib_add_trace (vm, node, p0,
2346  sizeof (ethernet_arp_input_trace_t));
2347  clib_memcpy (t0, l3h0, sizeof (ethernet_arp_input_trace_t));
2348  }
2349 
2350  error0 = 0;
2351  error0 =
2352  (arp0->l2_type !=
2353  clib_net_to_host_u16 (ETHERNET_ARP_HARDWARE_TYPE_ethernet)
2354  ? ETHERNET_ARP_ERROR_l2_type_not_ethernet : error0);
2355  error0 =
2356  (arp0->l3_type !=
2357  clib_net_to_host_u16 (ETHERNET_TYPE_IP4) ?
2358  ETHERNET_ARP_ERROR_l3_type_not_ip4 : error0);
2359 
2360  sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
2361 
2362  if (error0)
2363  goto drop;
2364 
2365  /* Trash ARP packets whose ARP-level source addresses do not
2366  match, or if requester address is mcast */
2367  if (PREDICT_FALSE
2368  (memcmp (eth0->src_address, arp0->ip4_over_ethernet[0].ethernet,
2369  sizeof (eth0->src_address)) ||
2370  ethernet_address_cast (arp0->ip4_over_ethernet[0].ethernet)))
2371  {
2372  /* VRRP virtual MAC may be different to SMAC in ARP reply */
2373  if (memcmp (arp0->ip4_over_ethernet[0].ethernet, vrrp_prefix,
2374  sizeof (vrrp_prefix)))
2375  {
2376  error0 = ETHERNET_ARP_ERROR_l2_address_mismatch;
2377  goto drop;
2378  }
2379  }
2380  if (PREDICT_FALSE
2381  (ip4_address_is_multicast (&arp0->ip4_over_ethernet[0].ip4)))
2382  {
2383  error0 = ETHERNET_ARP_ERROR_l3_src_address_not_local;
2384  goto drop;
2385  }
2386 
2387  /* Check if anyone want ARP request events for L2 BDs */
2388  {
2390  if (am->wc_ip4_arp_publisher_node != (uword) ~ 0)
2391  vnet_arp_wc_publish (sw_if_index0, &arp0->ip4_over_ethernet[0]);
2392  }
2393 
2394  /* lookup BD mac_by_ip4 hash table for MAC entry */
2395  ip0 = arp0->ip4_over_ethernet[1].ip4.as_u32;
2396  bd_index0 = vnet_buffer (p0)->l2.bd_index;
2397  if (PREDICT_FALSE ((bd_index0 != last_bd_index)
2398  || (last_bd_index == (u16) ~ 0)))
2399  {
2400  last_bd_index = bd_index0;
2401  last_bd_config = vec_elt_at_index (l2im->bd_configs, bd_index0);
2402  }
2403  macp0 = (u8 *) hash_get (last_bd_config->mac_by_ip4, ip0);
2404 
2405  if (PREDICT_FALSE (!macp0))
2406  goto next_l2_feature; /* MAC not found */
2407 
2408  /* MAC found, send ARP reply -
2409  Convert ARP request packet to ARP reply */
2410  arp0->opcode = clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply);
2411  arp0->ip4_over_ethernet[1] = arp0->ip4_over_ethernet[0];
2412  arp0->ip4_over_ethernet[0].ip4.as_u32 = ip0;
2413  clib_memcpy (arp0->ip4_over_ethernet[0].ethernet, macp0, 6);
2414  clib_memcpy (eth0->dst_address, eth0->src_address, 6);
2415  clib_memcpy (eth0->src_address, macp0, 6);
2416  n_replies_sent += 1;
2417 
2418  output_response:
2419  /* For BVI, need to use l2-fwd node to send ARP reply as
2420  l2-output node cannot output packet to BVI properly */
2421  cfg0 = vec_elt_at_index (l2im->configs, sw_if_index0);
2422  if (PREDICT_FALSE (cfg0->bvi))
2423  {
2424  vnet_buffer (p0)->l2.feature_bitmap |= L2INPUT_FEAT_FWD;
2425  vnet_buffer (p0)->sw_if_index[VLIB_RX] = 0;
2426  goto next_l2_feature;
2427  }
2428 
2429  /* Send ARP/ND reply back out input interface through l2-output */
2430  vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
2431  next0 = ARP_TERM_NEXT_L2_OUTPUT;
2432  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2433  to_next, n_left_to_next, pi0,
2434  next0);
2435  continue;
2436 
2437  check_ip6_nd:
2438  /* IP6 ND event notification or solicitation handling to generate
2439  local response instead of flooding */
2440  iph0 = (ip6_header_t *) l3h0;
2441  if (PREDICT_FALSE (ethertype0 == ETHERNET_TYPE_IP6 &&
2442  iph0->protocol == IP_PROTOCOL_ICMP6 &&
2444  (&iph0->src_address)))
2445  {
2446  sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
2447  if (vnet_ip6_nd_term
2448  (vm, node, p0, eth0, iph0, sw_if_index0,
2449  vnet_buffer (p0)->l2.bd_index))
2450  goto output_response;
2451  }
2452 
2453  next_l2_feature:
2454  {
2456  L2INPUT_FEAT_ARP_TERM);
2457  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2458  to_next, n_left_to_next,
2459  pi0, next0);
2460  continue;
2461  }
2462 
2463  drop:
2464  if (0 == arp0->ip4_over_ethernet[0].ip4.as_u32 ||
2465  (arp0->ip4_over_ethernet[0].ip4.as_u32 ==
2466  arp0->ip4_over_ethernet[1].ip4.as_u32))
2467  {
2468  error0 = ETHERNET_ARP_ERROR_gratuitous_arp;
2469  }
2470  next0 = ARP_TERM_NEXT_DROP;
2471  p0->error = node->errors[error0];
2472 
2473  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2474  to_next, n_left_to_next, pi0,
2475  next0);
2476  }
2477 
2478  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2479  }
2480 
2481  vlib_error_count (vm, node->node_index,
2482  ETHERNET_ARP_ERROR_replies_sent, n_replies_sent);
2483  return frame->n_vectors;
2484 }
2485 
2486 /* *INDENT-OFF* */
2488  .function = arp_term_l2bd,
2489  .name = "arp-term-l2bd",
2490  .vector_size = sizeof (u32),
2491  .n_errors = ETHERNET_ARP_N_ERROR,
2492  .error_strings = ethernet_arp_error_strings,
2493  .n_next_nodes = ARP_TERM_N_NEXT,
2494  .next_nodes = {
2495  [ARP_TERM_NEXT_L2_OUTPUT] = "l2-output",
2496  [ARP_TERM_NEXT_DROP] = "error-drop",
2497  },
2498  .format_buffer = format_ethernet_arp_header,
2499  .format_trace = format_arp_term_input_trace,
2500 };
2501 /* *INDENT-ON* */
2502 
2503 clib_error_t *
2505 {
2506  // Initialize the feature next-node indexes
2508  arp_term_l2bd_node.index,
2512  return 0;
2513 }
2514 
2516 
2517 void
2519 {
2520  if (e->sw_if_index == sw_if_index)
2521  {
2524  }
2525 }
2526 
2527 void
2529 {
2532  adj_index_t ai;
2533 
2534  /* *INDENT-OFF* */
2535  pool_foreach (e, am->ip4_entry_pool,
2536  ({
2537  change_arp_mac (sw_if_index, e);
2538  }));
2539  /* *INDENT-ON* */
2540 
2541  ai = adj_glean_get (FIB_PROTOCOL_IP4, sw_if_index);
2542 
2543  if (ADJ_INDEX_INVALID != ai)
2545 }
2546 
2547 void
2549 {
2550  ip4_main_t *i4m = &ip4_main;
2551  ip4_address_t *ip4_addr = ip4_interface_first_address (i4m, sw_if_index, 0);
2552 
2553  send_ip4_garp_w_addr (vm, ip4_addr, sw_if_index);
2554 }
2555 
2556 void
2558  const ip4_address_t * ip4_addr, u32 sw_if_index)
2559 {
2560  ip4_main_t *i4m = &ip4_main;
2561  vnet_main_t *vnm = vnet_get_main ();
2562  u8 *rewrite, rewrite_len;
2563  vnet_hw_interface_t *hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
2564 
2565  if (ip4_addr)
2566  {
2567  clib_warning ("Sending GARP for IP4 address %U on sw_if_idex %d",
2568  format_ip4_address, ip4_addr, sw_if_index);
2569 
2570  /* Form GARP packet for output - Gratuitous ARP is an ARP request packet
2571  where the interface IP/MAC pair is used for both source and request
2572  MAC/IP pairs in the request */
2573  u32 bi = 0;
2575  (vm, &i4m->ip4_arp_request_packet_template, &bi);
2576 
2577  if (!h)
2578  return;
2579 
2580  clib_memcpy (h->ip4_over_ethernet[0].ethernet, hi->hw_address,
2581  sizeof (h->ip4_over_ethernet[0].ethernet));
2582  clib_memcpy (h->ip4_over_ethernet[1].ethernet, hi->hw_address,
2583  sizeof (h->ip4_over_ethernet[1].ethernet));
2584  h->ip4_over_ethernet[0].ip4 = ip4_addr[0];
2585  h->ip4_over_ethernet[1].ip4 = ip4_addr[0];
2586 
2587  /* Setup MAC header with ARP Etype and broadcast DMAC */
2588  vlib_buffer_t *b = vlib_get_buffer (vm, bi);
2589  rewrite =
2590  ethernet_build_rewrite (vnm, sw_if_index, VNET_LINK_ARP,
2592  rewrite_len = vec_len (rewrite);
2593  vlib_buffer_advance (b, -rewrite_len);
2595  clib_memcpy (e->dst_address, rewrite, rewrite_len);
2596  vec_free (rewrite);
2597 
2598  /* Send GARP packet out the specified interface */
2599  vnet_buffer (b)->sw_if_index[VLIB_RX] =
2600  vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index;
2602  u32 *to_next = vlib_frame_vector_args (f);
2603  to_next[0] = bi;
2604  f->n_vectors = 1;
2606  }
2607 }
2608 
2609 /*
2610  * fd.io coding-style-patch-verification: ON
2611  *
2612  * Local Variables:
2613  * eval: (c-set-style "gnu")
2614  * End:
2615  */
#define vec_validate(V, I)
Make sure vector is long enough for given index (no header, unspecified alignment) ...
Definition: vec.h:437
#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:1871
vmrglw vmrglh hi
#define pool_next_index(P, I)
Return next occupied pool index after i, useful for safe iteration.
Definition: pool.h:472
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:35
#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:2282
#define hash_set(h, key, value)
Definition: hash.h:255
l2_input_config_t * configs
Definition: l2_input.h:61
vl_api_address_t src
Definition: vxlan_gbp.api:33
An entry in a FIB table.
Definition: fib_entry.h:458
ip4_table_bind_function_t * function
Definition: ip4.h:83
#define CLIB_UNUSED(x)
Definition: clib.h:81
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:1550
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:619
uword unformat_pg_arp_header(unformat_input_t *input, va_list *args)
Definition: arp.c:1502
static void pg_ethernet_arp_header_init(pg_ethernet_arp_header_t *p)
Definition: arp.c:1485
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:1822
static void increment_ip4_and_mac_address(ethernet_arp_ip4_over_ethernet_address_t *a)
Definition: arp.c:1939
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:426
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:1662
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:1410
vnet_interface_main_t interface_main
Definition: vnet.h:56
struct ip_adjacency_t_::@45::@46 nbr
IP_LOOKUP_NEXT_ARP/IP_LOOKUP_NEXT_REWRITE.
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
vnet_link_t adj_get_link_type(adj_index_t ai)
Return the link type of the adjacency.
Definition: adj.c:400
#define NULL
Definition: clib.h:57
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:227
Broadcasr Adjacency.
Definition: adj.h:85
IP unicast adjacency.
Definition: adj.h:185
Information related to the source of a FIB entry.
Definition: fib_entry.h:350
union ip_adjacency_t_::@45 sub_type
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:2518
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:2202
clib_error_t * ip4_set_arp_limit(u32 arp_limit)
Definition: arp.c:1538
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:523
word vnet_sw_interface_compare(vnet_main_t *vnm, uword sw_if_index0, uword sw_if_index1)
Definition: interface.c:1147
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:1720
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:562
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:596
pg_edit_t l2_type
Definition: arp.c:1474
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:1622
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:317
void vl_api_rpc_call_main_thread(void *fp, u8 *data, u32 data_length)
Definition: vlib_api.c:638
vlib_error_t * errors
Vector of errors for this node.
Definition: node.h:472
Definition: fib_entry.h:277
#define pool_get(P, E)
Allocate an object E from a pool P (unspecified alignment).
Definition: pool.h:228
vhost_vring_addr_t addr
Definition: vhost_user.h:121
pg_edit_t ethernet
Definition: arp.c:1479
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:356
vnet_link_t ia_link
link/ether-type 1 bytes
Definition: adj.h:206
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:1849
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:873
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:380
pg_edit_t n_l3_address_bytes
Definition: arp.c:1475
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:738
#define pool_foreach(VAR, POOL, BODY)
Iterate through pool.
Definition: pool.h:443
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:542
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:83
u32 sw_if_index
Definition: vxlan_gbp.api:39
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:1369
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:1981
#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:182
#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:231
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:409
#define hash_create_string(elts, value_bytes)
Definition: hash.h:690
pg_edit_t l3_type
Definition: arp.c:1474
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:1962
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: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:464
static ethernet_header_t * ethernet_buffer_get_header(vlib_buffer_t *b)
Definition: ethernet.h:394
#define foreach_ethernet_arp_error
Definition: arp.c:880
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:960
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:42
#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:1384
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:191
static void * vlib_buffer_get_current(vlib_buffer_t *b)
Get pointer to current data to process.
Definition: buffer.h:205
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:274
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:854
#define PREDICT_FALSE(x)
Definition: clib.h:107
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:720
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:494
static clib_error_t * ethernet_arp_init(vlib_main_t *vm)
Definition: arp.c:1755
#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:364
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:1236
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:138
u32 flags
Definition: vhost_user.h:115
u32 fib_entry_get_resolving_interface(fib_node_index_t entry_index)
Definition: fib_entry.c:1409
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:2066
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: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:2548
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:155
#define UNFORMAT_END_OF_INPUT
Definition: format.h:144
u16 n_vectors
Definition: node.h:401
static_always_inline uword vlib_get_thread_index(void)
Definition: threads.h:211
static void arp_mk_incomplete(adj_index_t ai)
Definition: arp.c:395
vlib_main_t * vm
Definition: buffer.c:294
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:1475
#define vec_free(V)
Free vector&#39;s memory (no header).
Definition: vec.h:339
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:1344
#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
#define clib_memcpy(a, b, c)
Definition: string.h:75
unformat_function_t * unformat_edit
Definition: pg.h:313
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:1606
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:455
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:777
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:1893
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:45
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:1994
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:2557
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:1265
#define VLIB_CLI_COMMAND(x,...)
Definition: cli.h:155
struct pg_ethernet_arp_header_t::@121 ip4_over_ethernet[2]
This packets follow a mid-chain adjacency.
Definition: adj.h:76
clib_error_t * arp_term_init(vlib_main_t *vm)
Definition: arp.c:2504
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: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:1572
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:2279
#define vec_delete(V, N, M)
Delete N elements starting at element M.
Definition: vec.h:786
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:284
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:218
size_t count
Definition: vapi.c:46
#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:96
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:1322
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:2487
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: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:57
l2input_main_t l2input_main
Definition: l2_input.c:113
static vlib_node_registration_t arp_input_node
(constructor) VLIB_REGISTER_NODE (arp_input_node)
Definition: arp.c:1351
#define FIB_NODE_INDEX_INVALID
Definition: fib_types.h:31
int vnet_proxy_arp_fib_reset(u32 fib_id)
Definition: arp.c:2035
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:200
#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:1171
#define vec_sort_with_function(vec, f)
Sort a vector using the supplied element comparison function.
Definition: vec.h:982
#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:1617
vnet_sw_interface_t * sw_interfaces
Definition: interface.h:846
static void * vlib_frame_vector_args(vlib_frame_t *f)
Get pointer to frame vector data.
Definition: node_funcs.h:267
static clib_error_t * ethernet_init(vlib_main_t *vm)
Definition: init.c:82
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:1811
pg_edit_t opcode
Definition: arp.c:1476
ethernet_arp_input_error_t
Definition: arp.c:897
arp_term_next_t
Definition: arp.c:2272
static void vnet_arp_wc_publish_internal(vnet_main_t *vnm, vnet_arp_set_ip4_over_ethernet_rpc_args_t *args)
Definition: arp.c:1587
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:344
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:900
uword node_index
Definition: arp.c:64
#define vec_foreach(var, vec)
Vector iterator.
uword * mac_by_ip4
Definition: l2_bd.h:99
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:1391
uword wc_ip4_arp_publisher_node
Definition: arp.c:97
#define VLIB_NODE_FLAG_TRACE
Definition: node.h:310
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:116
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:296
void ethernet_arp_change_mac(u32 sw_if_index)
Definition: arp.c:2528
void vlib_cli_output(vlib_main_t *vm, char *fmt,...)
Definition: cli.c:725
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:808
static vlib_buffer_t * vlib_get_buffer(vlib_main_t *vm, u32 buffer_index)
Translate buffer index into buffer pointer.
Definition: buffer_funcs.h:58
Definition: pg.h:310
const u8 * ethernet_ip4_mcast_dst_addr(void)
Definition: interface.c:56
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
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:276
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