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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 
30 /**
31  * @file
32  * @brief IPv4 ARP.
33  *
34  * This file contains code to manage the IPv4 ARP tables (IP Address
35  * to MAC Address lookup).
36  */
37 
38 
39 void vl_api_rpc_call_main_thread (void *fp, u8 * data, u32 data_length);
40 
41 /**
42  * @brief Per-interface ARP configuration and state
43  */
45 {
46  /**
47  * Hash table of ARP entries.
48  * Since this hash table is per-interface, the key is only the IPv4 address.
49  */
52 
53 typedef struct
54 {
59 
60 typedef struct
61 {
66  /* Used for arp event notification only */
70 
71 typedef struct
72 {
73  /* Hash tables mapping name to opcode. */
75 
76  /* lite beer "glean" adjacency handling */
79 
80  /* Mac address change notification */
83 
85 
86  /* ARP attack mitigation */
89 
90  /** Per interface state */
92 
93  /* Proxy arp vector */
95 
99 
101 
102 typedef struct
103 {
105  ethernet_arp_ip4_over_ethernet_address_t a;
108  int flags;
109 #define ETHERNET_ARP_ARGS_REMOVE (1<<0)
110 #define ETHERNET_ARP_ARGS_FLUSH (1<<1)
111 #define ETHERNET_ARP_ARGS_POPULATE (1<<2)
112 #define ETHERNET_ARP_ARGS_WC_PUB (1<<3)
114 
115 static const u8 vrrp_prefix[] = { 0x00, 0x00, 0x5E, 0x00, 0x01 };
116 
117 /* Node index for send_garp_na_process */
119 
120 static void
122  * a);
123 
124 static u8 *
126 {
128  char *t = 0;
129  switch (h)
130  {
131 #define _(n,f) case n: t = #f; break;
133 #undef _
134 
135  default:
136  return format (s, "unknown 0x%x", h);
137  }
138 
139  return format (s, "%s", t);
140 }
141 
142 static u8 *
143 format_ethernet_arp_opcode (u8 * s, va_list * va)
144 {
146  char *t = 0;
147  switch (o)
148  {
149 #define _(f) case ETHERNET_ARP_OPCODE_##f: t = #f; break;
151 #undef _
152 
153  default:
154  return format (s, "unknown 0x%x", o);
155  }
156 
157  return format (s, "%s", t);
158 }
159 
160 static uword
162  va_list * args)
163 {
164  int *result = va_arg (*args, int *);
166  int x, i;
167 
168  /* Numeric opcode. */
169  if (unformat (input, "0x%x", &x) || unformat (input, "%d", &x))
170  {
171  if (x >= (1 << 16))
172  return 0;
173  *result = x;
174  return 1;
175  }
176 
177  /* Named type. */
179  am->opcode_by_name, &i))
180  {
181  *result = i;
182  return 1;
183  }
184 
185  return 0;
186 }
187 
188 static uword
190  va_list * args)
191 {
192  int *result = va_arg (*args, int *);
193  if (!unformat_user
195  return 0;
196 
197  *result = clib_host_to_net_u16 ((u16) * result);
198  return 1;
199 }
200 
201 static u8 *
202 format_ethernet_arp_header (u8 * s, va_list * va)
203 {
204  ethernet_arp_header_t *a = va_arg (*va, ethernet_arp_header_t *);
205  u32 max_header_bytes = va_arg (*va, u32);
206  u32 indent;
207  u16 l2_type, l3_type;
208 
209  if (max_header_bytes != 0 && sizeof (a[0]) > max_header_bytes)
210  return format (s, "ARP header truncated");
211 
212  l2_type = clib_net_to_host_u16 (a->l2_type);
213  l3_type = clib_net_to_host_u16 (a->l3_type);
214 
215  indent = format_get_indent (s);
216 
217  s = format (s, "%U, type %U/%U, address size %d/%d",
218  format_ethernet_arp_opcode, clib_net_to_host_u16 (a->opcode),
220  format_ethernet_type, l3_type,
222 
223  if (l2_type == ETHERNET_ARP_HARDWARE_TYPE_ethernet
224  && l3_type == ETHERNET_TYPE_IP4)
225  {
226  s = format (s, "\n%U%U/%U -> %U/%U",
227  format_white_space, indent,
232  }
233  else
234  {
235  uword n2 = a->n_l2_address_bytes;
236  uword n3 = a->n_l3_address_bytes;
237  s = format (s, "\n%U%U/%U -> %U/%U",
238  format_white_space, indent,
239  format_hex_bytes, a->data + 0 * n2 + 0 * n3, n2,
240  format_hex_bytes, a->data + 1 * n2 + 0 * n3, n3,
241  format_hex_bytes, a->data + 1 * n2 + 1 * n3, n2,
242  format_hex_bytes, a->data + 2 * n2 + 1 * n3, n3);
243  }
244 
245  return s;
246 }
247 
248 u8 *
250 {
251  vnet_main_t *vnm = va_arg (*va, vnet_main_t *);
254  u8 *flags = 0;
255 
256  if (!e)
257  return format (s, "%=12s%=16s%=6s%=20s%=24s", "Time", "IP4",
258  "Flags", "Ethernet", "Interface");
259 
260  si = vnet_get_sw_interface (vnm, e->sw_if_index);
261 
263  flags = format (flags, "S");
264 
266  flags = format (flags, "D");
267 
269  flags = format (flags, "N");
270 
271  s = format (s, "%=12U%=16U%=6s%=20U%U",
274  flags ? (char *) flags : "",
277 
278  vec_free (flags);
279  return s;
280 }
281 
282 typedef struct
283 {
284  u8 packet_data[64];
286 
287 static u8 *
289 {
290  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
291  CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
293 
294  s = format (s, "%U",
296  t->packet_data, sizeof (t->packet_data));
297 
298  return s;
299 }
300 
301 static u8 *
302 format_arp_term_input_trace (u8 * s, va_list * va)
303 {
304  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
305  CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
307 
308  /* arp-term trace data saved is either arp or ip6/icmp6 packet:
309  - for arp, the 1st 16-bit field is hw type of value of 0x0001.
310  - for ip6, the first nibble has value of 6. */
311  s = format (s, "%U", t->packet_data[0] == 0 ?
313  t->packet_data, sizeof (t->packet_data));
314 
315  return s;
316 }
317 
318 static void
320 {
321  vnet_main_t *vnm = vnet_get_main ();
322  ip4_main_t *im = &ip4_main;
327  ip4_address_t *src;
328  vlib_buffer_t *b;
329  vlib_main_t *vm;
330  u32 bi = 0;
331 
332  vm = vlib_get_main ();
333 
334  si = vnet_get_sw_interface (vnm, adj->rewrite_header.sw_if_index);
335 
337  {
338  return;
339  }
340 
341  src =
343  &adj->sub_type.nbr.next_hop.
344  ip4,
345  adj->rewrite_header.
346  sw_if_index, &ia);
347  if (!src)
348  {
349  return;
350  }
351 
352  h =
354  &bi);
355  if (!h)
356  return;
357 
358  hi = vnet_get_sup_hw_interface (vnm, adj->rewrite_header.sw_if_index);
359 
360  clib_memcpy (h->ip4_over_ethernet[0].ethernet,
361  hi->hw_address, sizeof (h->ip4_over_ethernet[0].ethernet));
362 
363  h->ip4_over_ethernet[0].ip4 = src[0];
364  h->ip4_over_ethernet[1].ip4 = adj->sub_type.nbr.next_hop.ip4;
365 
366  b = vlib_get_buffer (vm, bi);
367  vnet_buffer (b)->sw_if_index[VLIB_RX] =
368  vnet_buffer (b)->sw_if_index[VLIB_TX] = adj->rewrite_header.sw_if_index;
369 
370  /* Add encapsulation string for software interface (e.g. ethernet header). */
371  vnet_rewrite_one_header (adj[0], h, sizeof (ethernet_header_t));
372  vlib_buffer_advance (b, -adj->rewrite_header.data_bytes);
373 
374  {
376  u32 *to_next = vlib_frame_vector_args (f);
377  to_next[0] = bi;
378  f->n_vectors = 1;
380  }
381 }
382 
383 static void
385 {
389  e->sw_if_index,
391 }
392 
393 static void
395 {
396  ip_adjacency_t *adj = adj_get (ai);
397 
399  (ai,
402  adj->rewrite_header.sw_if_index,
405 }
406 
409 {
412  uword *p;
413 
414  if (NULL != eai->arp_entries)
415  {
416  p = hash_get (eai->arp_entries, addr->as_u32);
417  if (!p)
418  return (NULL);
419 
420  e = pool_elt_at_index (am->ip4_entry_pool, p[0]);
421  }
422 
423  return (e);
424 }
425 
426 static adj_walk_rc_t
428 {
430 
431  arp_mk_complete (ai, e);
432 
433  return (ADJ_WALK_RC_CONTINUE);
434 }
435 
436 static adj_walk_rc_t
438 {
439  arp_mk_incomplete (ai);
440 
441  return (ADJ_WALK_RC_CONTINUE);
442 }
443 
444 void
445 arp_update_adjacency (vnet_main_t * vnm, u32 sw_if_index, u32 ai)
446 {
448  ethernet_arp_interface_t *arp_int;
450  ip_adjacency_t *adj;
451 
452  adj = adj_get (ai);
453 
454  vec_validate (am->ethernet_arp_by_sw_if_index, sw_if_index);
455  arp_int = &am->ethernet_arp_by_sw_if_index[sw_if_index];
456  e = arp_entry_find (arp_int, &adj->sub_type.nbr.next_hop.ip4);
457 
458  switch (adj->lookup_next_index)
459  {
462  break;
463  case IP_LOOKUP_NEXT_ARP:
464  if (NULL != e)
465  {
466  adj_nbr_walk_nh4 (sw_if_index,
468  }
469  else
470  {
471  /*
472  * no matching ARP entry.
473  * construct the rewrite required to for an ARP packet, and stick
474  * that in the adj's pipe to smoke.
475  */
477  (ai,
480  (vnm,
481  sw_if_index,
484 
485  /*
486  * since the FIB has added this adj for a route, it makes sense it
487  * may want to forward traffic sometime soon. Let's send a
488  * speculative ARP. just one. If we were to do periodically that
489  * wouldn't be bad either, but that's more code than i'm prepared to
490  * write at this time for relatively little reward.
491  */
492  arp_nbr_probe (adj);
493  }
494  break;
496  {
497  /*
498  * Construct a partial rewrite from the known ethernet mcast dest MAC
499  */
500  u8 *rewrite;
501  u8 offset;
502 
503  rewrite = ethernet_build_rewrite (vnm,
504  sw_if_index,
505  adj->ia_link,
507  offset = vec_len (rewrite) - 2;
508 
509  /*
510  * Complete the remaining fields of the adj's rewrite to direct the
511  * complete of the rewrite at switch time by copying in the IP
512  * dst address's bytes.
513  * Ofset is 2 bytes into the MAC desintation address.
514  */
515  adj_mcast_update_rewrite (ai, rewrite, offset);
516 
517  break;
518  }
519  case IP_LOOKUP_NEXT_DROP:
520  case IP_LOOKUP_NEXT_PUNT:
526  case IP_LOOKUP_N_NEXT:
527  ASSERT (0);
528  break;
529  }
530 }
531 
532 static void
534 {
535  fib_prefix_t pfx = {
536  .fp_len = 32,
537  .fp_proto = FIB_PROTOCOL_IP4,
538  .fp_addr.ip4 = e->ip4_address,
539  };
540 
541  e->fib_entry_index =
542  fib_table_entry_path_add (fib_index, &pfx, FIB_SOURCE_ADJ,
544  DPO_PROTO_IP4, &pfx.fp_addr,
545  e->sw_if_index, ~0, 1, NULL,
548 }
549 
550 void
552 {
554  {
555  fib_prefix_t pfx = {
556  .fp_len = 32,
557  .fp_proto = FIB_PROTOCOL_IP4,
558  .fp_addr.ip4 = e->ip4_address,
559  };
560  u32 fib_index;
561 
563 
564  fib_table_entry_path_remove (fib_index, &pfx,
567  &pfx.fp_addr,
568  e->sw_if_index, ~0, 1,
571  }
572 }
573 
576 {
579  u32 count = 0;
581  if (index == ~0) /* Try again from elt 0 */
582  index = pool_next_index (am->ip4_entry_pool, index);
583 
584  /* Find a non-static random entry to free up for reuse */
585  do
586  {
587  if ((count++ == 100) || (index == ~0))
588  return NULL; /* give up after 100 entries */
589  e = pool_elt_at_index (am->ip4_entry_pool, index);
590  am->arp_delete_rotor = index;
591  index = pool_next_index (am->ip4_entry_pool, index);
592  }
594 
595  /* Remove ARP entry from its interface and update fib */
596  hash_unset
598  e->ip4_address.as_u32);
603  return e;
604 }
605 
606 static int
609  * args)
610 {
613  ethernet_arp_ip4_over_ethernet_address_t *a = &args->a;
615  int make_new_arp_cache_entry = 1;
616  uword *p;
617  pending_resolution_t *pr, *mc;
618  ethernet_arp_interface_t *arp_int;
619  int is_static = args->is_static;
620  u32 sw_if_index = args->sw_if_index;
621  int is_no_fib_entry = args->is_no_fib_entry;
622 
623  vec_validate (am->ethernet_arp_by_sw_if_index, sw_if_index);
624 
625  arp_int = &am->ethernet_arp_by_sw_if_index[sw_if_index];
626 
627  if (NULL != arp_int->arp_entries)
628  {
629  p = hash_get (arp_int->arp_entries, a->ip4.as_u32);
630  if (p)
631  {
632  e = pool_elt_at_index (am->ip4_entry_pool, p[0]);
633 
634  /* Refuse to over-write static arp. */
635  if (!is_static && (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC))
636  return -2;
637  make_new_arp_cache_entry = 0;
638  }
639  }
640 
641  if (make_new_arp_cache_entry)
642  {
643  if (am->limit_arp_cache_size &&
645  {
646  e = force_reuse_arp_entry ();
647  if (NULL == e)
648  return -2;
649  }
650  else
651  pool_get (am->ip4_entry_pool, e);
652 
653  if (NULL == arp_int->arp_entries)
654  arp_int->arp_entries = hash_create (0, sizeof (u32));
655 
656  hash_set (arp_int->arp_entries, a->ip4.as_u32, e - am->ip4_entry_pool);
657 
658  e->sw_if_index = sw_if_index;
659  e->ip4_address = a->ip4;
662  a->ethernet, sizeof (e->ethernet_address));
663 
664  if (!is_no_fib_entry)
665  {
666  arp_adj_fib_add (e,
668  (e->sw_if_index));
669  }
670  else
671  {
673  }
674  }
675  else
676  {
677  /*
678  * prevent a DoS attack from the data-plane that
679  * spams us with no-op updates to the MAC address
680  */
681  if (0 == memcmp (e->ethernet_address,
682  a->ethernet, sizeof (e->ethernet_address)))
683  {
685  goto check_customers;
686  }
687 
688  /* Update time stamp and ethernet address. */
689  clib_memcpy (e->ethernet_address, a->ethernet,
690  sizeof (e->ethernet_address));
691  }
692 
694  if (is_static)
695  {
698  }
699  else
700  {
703  }
704 
705  adj_nbr_walk_nh4 (sw_if_index, &e->ip4_address, arp_mk_complete_walk, e);
706 
707 check_customers:
708  /* Customer(s) waiting for this address to be resolved? */
709  p = hash_get (am->pending_resolutions_by_address, a->ip4.as_u32);
710  if (p)
711  {
712  u32 next_index;
713  next_index = p[0];
714 
715  while (next_index != (u32) ~ 0)
716  {
717  pr = pool_elt_at_index (am->pending_resolutions, next_index);
719  pr->type_opaque, pr->data);
720  next_index = pr->next_index;
721  pool_put (am->pending_resolutions, pr);
722  }
723 
724  hash_unset (am->pending_resolutions_by_address, a->ip4.as_u32);
725  }
726 
727  /* Customer(s) requesting ARP event for this address? */
728  p = hash_get (am->mac_changes_by_address, a->ip4.as_u32);
729  if (p)
730  {
731  u32 next_index;
732  next_index = p[0];
733 
734  while (next_index != (u32) ~ 0)
735  {
736  int (*fp) (u32, u8 *, u32, u32);
737  int rv = 1;
738  mc = pool_elt_at_index (am->mac_changes, next_index);
739  fp = mc->data_callback;
740 
741  /* Call the user's data callback, return 1 to suppress dup events */
742  if (fp)
743  rv = (*fp) (mc->data, a->ethernet, sw_if_index, 0);
744 
745  /*
746  * Signal the resolver process, as long as the user
747  * says they want to be notified
748  */
749  if (rv == 0)
751  mc->type_opaque, mc->data);
752  next_index = mc->next_index;
753  }
754  }
755 
756  return 0;
757 }
758 
759 void
761  void *address_arg,
762  uword node_index,
763  uword type_opaque, uword data)
764 {
766  ip4_address_t *address = address_arg;
767  uword *p;
769 
770  pool_get (am->pending_resolutions, pr);
771 
772  pr->next_index = ~0;
773  pr->node_index = node_index;
774  pr->type_opaque = type_opaque;
775  pr->data = data;
776  pr->data_callback = 0;
777 
778  p = hash_get (am->pending_resolutions_by_address, address->as_u32);
779  if (p)
780  {
781  /* Insert new resolution at the head of the list */
782  pr->next_index = p[0];
784  }
785 
787  pr - am->pending_resolutions);
788 }
789 
790 int
792  void *data_callback,
793  u32 pid,
794  void *address_arg,
795  uword node_index,
796  uword type_opaque, uword data, int is_add)
797 {
799  ip4_address_t *address = address_arg;
800 
801  /* Try to find an existing entry */
802  u32 *first = (u32 *) hash_get (am->mac_changes_by_address, address->as_u32);
803  u32 *p = first;
805  while (p && *p != ~0)
806  {
807  mc = pool_elt_at_index (am->mac_changes, *p);
808  if (mc->node_index == node_index && mc->type_opaque == type_opaque
809  && mc->pid == pid)
810  break;
811  p = &mc->next_index;
812  }
813 
814  int found = p && *p != ~0;
815  if (is_add)
816  {
817  if (found)
818  return VNET_API_ERROR_ENTRY_ALREADY_EXISTS;
819 
820  pool_get (am->mac_changes, mc);
821  *mc = (pending_resolution_t)
822  {
823  .next_index = ~0,.node_index = node_index,.type_opaque =
824  type_opaque,.data = data,.data_callback = data_callback,.pid =
825  pid,};
826 
827  /* Insert new resolution at the end of the list */
828  u32 new_idx = mc - am->mac_changes;
829  if (p)
830  p[0] = new_idx;
831  else
832  hash_set (am->mac_changes_by_address, address->as_u32, new_idx);
833  }
834  else
835  {
836  if (!found)
837  return VNET_API_ERROR_NO_SUCH_ENTRY;
838 
839  /* Clients may need to clean up pool entries, too */
840  void (*fp) (u32, u8 *) = data_callback;
841  if (fp)
842  (*fp) (mc->data, 0 /* no new mac addrs */ );
843 
844  /* Remove the entry from the list and delete the entry */
845  *p = mc->next_index;
846  pool_put (am->mac_changes, mc);
847 
848  /* Remove from hash if we deleted the last entry */
849  if (*p == ~0 && p == first)
850  hash_unset (am->mac_changes_by_address, address->as_u32);
851  }
852  return 0;
853 }
854 
855 /* Either we drop the packet or we send a reply to the sender. */
856 typedef enum
857 {
862 
863 #define foreach_ethernet_arp_error \
864  _ (replies_sent, "ARP replies sent") \
865  _ (l2_type_not_ethernet, "L2 type not ethernet") \
866  _ (l3_type_not_ip4, "L3 type not IP4") \
867  _ (l3_src_address_not_local, "IP4 source address not local to subnet") \
868  _ (l3_dst_address_not_local, "IP4 destination address not local to subnet") \
869  _ (l3_dst_address_unset, "IP4 destination address is unset") \
870  _ (l3_src_address_is_local, "IP4 source address matches local interface") \
871  _ (l3_src_address_learned, "ARP request IP4 source address learned") \
872  _ (replies_received, "ARP replies received") \
873  _ (opcode_not_request, "ARP opcode not request") \
874  _ (proxy_arp_replies_sent, "Proxy ARP replies sent") \
875  _ (l2_address_mismatch, "ARP hw addr does not match L2 frame src addr") \
876  _ (gratuitous_arp, "ARP probe or announcement dropped") \
877  _ (interface_no_table, "Interface is not mapped to an IP table") \
878  _ (interface_not_ip_enabled, "Interface is not IP enabled") \
879 
880 typedef enum
881 {
882 #define _(sym,string) ETHERNET_ARP_ERROR_##sym,
884 #undef _
887 
888 static int
890  u32 input_sw_if_index, u32 conn_sw_if_index)
891 {
892  vnet_main_t *vnm = vnet_get_main ();
895 
896  /* verify that the input interface is unnumbered to the connected.
897  * the connected interface is the interface on which the subnet is
898  * configured */
899  si = &vim->sw_interfaces[input_sw_if_index];
900 
902  (si->unnumbered_sw_if_index == conn_sw_if_index)))
903  {
904  /* the input interface is not unnumbered to the interface on which
905  * the sub-net is configured that covers the ARP request.
906  * So this is not the case for unnumbered.. */
907  return 0;
908  }
909 
910  return !0;
911 }
912 
913 static u32
915  ethernet_arp_main_t * am, u32 sw_if_index, void *addr)
916 {
917  vnet_arp_set_ip4_over_ethernet (vnm, sw_if_index, addr, 0, 0);
918  return (ETHERNET_ARP_ERROR_l3_src_address_learned);
919 }
920 
921 static uword
923 {
925  vnet_main_t *vnm = vnet_get_main ();
926  ip4_main_t *im4 = &ip4_main;
927  u32 n_left_from, next_index, *from, *to_next;
928  u32 n_replies_sent = 0, n_proxy_arp_replies_sent = 0;
929 
930  from = vlib_frame_vector_args (frame);
931  n_left_from = frame->n_vectors;
932  next_index = node->cached_next_index;
933 
934  if (node->flags & VLIB_NODE_FLAG_TRACE)
935  vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
936  /* stride */ 1,
937  sizeof (ethernet_arp_input_trace_t));
938 
939  while (n_left_from > 0)
940  {
941  u32 n_left_to_next;
942 
943  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
944 
945  while (n_left_from > 0 && n_left_to_next > 0)
946  {
947  vlib_buffer_t *p0;
948  vnet_hw_interface_t *hw_if0;
949  ethernet_arp_header_t *arp0;
950  ethernet_header_t *eth_rx, *eth_tx;
951  ip4_address_t *if_addr0, proxy_src;
952  u32 pi0, error0, next0, sw_if_index0, conn_sw_if_index0, fib_index0;
953  u8 is_request0, dst_is_local0, is_unnum0, is_vrrp_reply0;
955  fib_node_index_t dst_fei, src_fei;
956  fib_prefix_t pfx0;
957  fib_entry_flag_t src_flags, dst_flags;
958  u8 *rewrite0, rewrite0_len;
959 
960  pi0 = from[0];
961  to_next[0] = pi0;
962  from += 1;
963  to_next += 1;
964  n_left_from -= 1;
965  n_left_to_next -= 1;
966  pa = 0;
967 
968  p0 = vlib_get_buffer (vm, pi0);
969  arp0 = vlib_buffer_get_current (p0);
970  /* Fill in ethernet header. */
971  eth_rx = ethernet_buffer_get_header (p0);
972 
973  is_request0 = arp0->opcode
974  == clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_request);
975 
976  error0 = ETHERNET_ARP_ERROR_replies_sent;
977 
978  error0 =
979  (arp0->l2_type !=
980  clib_net_to_host_u16 (ETHERNET_ARP_HARDWARE_TYPE_ethernet) ?
981  ETHERNET_ARP_ERROR_l2_type_not_ethernet : error0);
982  error0 =
983  (arp0->l3_type !=
984  clib_net_to_host_u16 (ETHERNET_TYPE_IP4) ?
985  ETHERNET_ARP_ERROR_l3_type_not_ip4 : error0);
986  error0 =
987  (0 == arp0->ip4_over_ethernet[0].ip4.as_u32 ?
988  ETHERNET_ARP_ERROR_l3_dst_address_unset : error0);
989 
990  sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
991 
992  /* not playing the ARP game if the interface is not IPv4 enabled */
993  error0 =
994  (im4->ip_enabled_by_sw_if_index[sw_if_index0] == 0 ?
995  ETHERNET_ARP_ERROR_interface_not_ip_enabled : error0);
996 
997  if (error0)
998  goto drop2;
999 
1000  /* Check that IP address is local and matches incoming interface. */
1001  fib_index0 = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);
1002  if (~0 == fib_index0)
1003  {
1004  error0 = ETHERNET_ARP_ERROR_interface_no_table;
1005  goto drop2;
1006 
1007  }
1008  dst_fei = ip4_fib_table_lookup (ip4_fib_get (fib_index0),
1009  &arp0->ip4_over_ethernet[1].ip4,
1010  32);
1011  dst_flags = fib_entry_get_flags (dst_fei);
1012 
1013  conn_sw_if_index0 = fib_entry_get_resolving_interface (dst_fei);
1014 
1015  /* Honor unnumbered interface, if any */
1016  is_unnum0 = sw_if_index0 != conn_sw_if_index0;
1017 
1018  {
1019  /*
1020  * we're looking for FIB entries that indicate the source
1021  * is attached. There may be more specific non-attached
1022  * routes that match the source, but these do not influence
1023  * whether we respond to an ARP request, i.e. they do not
1024  * influence whether we are the correct way for the sender
1025  * to reach us, they only affect how we reach the sender.
1026  */
1027  fib_entry_t *src_fib_entry;
1028  fib_entry_src_t *src;
1029  fib_source_t source;
1030  fib_prefix_t pfx;
1031  int attached;
1032  int mask;
1033 
1034  mask = 32;
1035  attached = 0;
1036 
1037  do
1038  {
1039  src_fei = ip4_fib_table_lookup (ip4_fib_get (fib_index0),
1040  &arp0->
1041  ip4_over_ethernet[0].ip4,
1042  mask);
1043  src_fib_entry = fib_entry_get (src_fei);
1044 
1045  /*
1046  * It's possible that the source that provides the
1047  * flags we need, or the flags we must not have,
1048  * is not the best source, so check then all.
1049  */
1050  /* *INDENT-OFF* */
1051  FOR_EACH_SRC_ADDED(src_fib_entry, src, source,
1052  ({
1053  src_flags = fib_entry_get_flags_for_source (src_fei, source);
1054 
1055  /* Reject requests/replies with our local interface
1056  address. */
1057  if (FIB_ENTRY_FLAG_LOCAL & src_flags)
1058  {
1059  error0 = ETHERNET_ARP_ERROR_l3_src_address_is_local;
1060  /*
1061  * When VPP has an interface whose address is also
1062  * applied to a TAP interface on the host, then VPP's
1063  * TAP interface will be unnumbered to the 'real'
1064  * interface and do proxy ARP from the host.
1065  * The curious aspect of this setup is that ARP requests
1066  * from the host will come from the VPP's own address.
1067  * So don't drop immediately here, instead go see if this
1068  * is a proxy ARP case.
1069  */
1070  goto drop1;
1071  }
1072  /* A Source must also be local to subnet of matching
1073  * interface address. */
1074  if ((FIB_ENTRY_FLAG_ATTACHED & src_flags) ||
1075  (FIB_ENTRY_FLAG_CONNECTED & src_flags))
1076  {
1077  attached = 1;
1078  break;
1079  }
1080  /*
1081  * else
1082  * The packet was sent from an address that is not
1083  * connected nor attached i.e. it is not from an
1084  * address that is covered by a link's sub-net,
1085  * nor is it a already learned host resp.
1086  */
1087  }));
1088  /* *INDENT-ON* */
1089 
1090  /*
1091  * shorter mask lookup for the next iteration.
1092  */
1093  fib_entry_get_prefix (src_fei, &pfx);
1094  mask = pfx.fp_len - 1;
1095 
1096  /*
1097  * continue until we hit the default route or we find
1098  * the attached we are looking for. The most likely
1099  * outcome is we find the attached with the first source
1100  * on the first lookup.
1101  */
1102  }
1103  while (!attached &&
1105 
1106  if (!attached)
1107  {
1108  /*
1109  * the matching route is a not attached, i.e. it was
1110  * added as a result of routing, rather than interface/ARP
1111  * configuration. If the matching route is not a host route
1112  * (i.e. a /32)
1113  */
1114  error0 = ETHERNET_ARP_ERROR_l3_src_address_not_local;
1115  goto drop2;
1116  }
1117  }
1118 
1119  if (fib_entry_is_sourced (dst_fei, FIB_SOURCE_ADJ))
1120  {
1121  /*
1122  * We matched an adj-fib on ths source subnet (a /32 previously
1123  * added as a result of ARP). If this request is a gratuitous
1124  * ARP, then learn from it.
1125  * The check for matching an adj-fib, is to prevent hosts
1126  * from spamming us with gratuitous ARPS that might otherwise
1127  * blow our ARP cache
1128  */
1129  if (arp0->ip4_over_ethernet[0].ip4.as_u32 ==
1130  arp0->ip4_over_ethernet[1].ip4.as_u32)
1131  error0 = arp_learn (vnm, am, sw_if_index0,
1132  &arp0->ip4_over_ethernet[0]);
1133  goto drop2;
1134  }
1135  else if (!(FIB_ENTRY_FLAG_CONNECTED & dst_flags))
1136  {
1137  error0 = ETHERNET_ARP_ERROR_l3_dst_address_not_local;
1138  goto drop1;
1139  }
1140 
1141  if (sw_if_index0 != fib_entry_get_resolving_interface (src_fei))
1142  {
1143  /*
1144  * The interface the ARP was received on is not the interface
1145  * on which the covering prefix is configured. Maybe this is a
1146  * case for unnumbered.
1147  */
1148  is_unnum0 = 1;
1149  }
1150 
1151  dst_is_local0 = (FIB_ENTRY_FLAG_LOCAL & dst_flags);
1152  fib_entry_get_prefix (dst_fei, &pfx0);
1153  if_addr0 = &pfx0.fp_addr.ip4;
1154 
1155  is_vrrp_reply0 =
1156  ((arp0->opcode ==
1157  clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply))
1158  &&
1159  (!memcmp
1160  (arp0->ip4_over_ethernet[0].ethernet, vrrp_prefix,
1161  sizeof (vrrp_prefix))));
1162 
1163  /* Trash ARP packets whose ARP-level source addresses do not
1164  match their L2-frame-level source addresses, unless it's
1165  a reply from a VRRP virtual router */
1166  if (memcmp
1167  (eth_rx->src_address, arp0->ip4_over_ethernet[0].ethernet,
1168  sizeof (eth_rx->src_address)) && !is_vrrp_reply0)
1169  {
1170  error0 = ETHERNET_ARP_ERROR_l2_address_mismatch;
1171  goto drop2;
1172  }
1173 
1174  /* Learn or update sender's mapping only for replies to addresses
1175  * that are local to the subnet */
1176  if (arp0->opcode ==
1177  clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply))
1178  {
1179  if (dst_is_local0)
1180  error0 = arp_learn (vnm, am, sw_if_index0,
1181  &arp0->ip4_over_ethernet[0]);
1182  else
1183  /* a reply for a non-local destination could be a GARP.
1184  * GARPs for hosts we know were handled above, so this one
1185  * we drop */
1186  error0 = ETHERNET_ARP_ERROR_l3_dst_address_not_local;
1187 
1188  goto drop1;
1189  }
1190  else if (arp0->opcode ==
1191  clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_request) &&
1192  (dst_is_local0 == 0))
1193  {
1194  goto drop1;
1195  }
1196 
1197  send_reply:
1198  /* Send a reply.
1199  An adjacency to the sender is not always present,
1200  so we use the interface to build us a rewrite string
1201  which will contain all the necessary tags. */
1202  rewrite0 = ethernet_build_rewrite (vnm, sw_if_index0,
1203  VNET_LINK_ARP,
1204  eth_rx->src_address);
1205  rewrite0_len = vec_len (rewrite0);
1206 
1207  /* Figure out how much to rewind current data from adjacency. */
1208  vlib_buffer_advance (p0, -rewrite0_len);
1209  eth_tx = vlib_buffer_get_current (p0);
1210 
1211  vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
1212  hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
1213 
1214  /* Send reply back through input interface */
1215  vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
1216  next0 = ARP_INPUT_NEXT_REPLY_TX;
1217 
1218  arp0->opcode = clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply);
1219 
1220  arp0->ip4_over_ethernet[1] = arp0->ip4_over_ethernet[0];
1221 
1222  clib_memcpy (arp0->ip4_over_ethernet[0].ethernet,
1223  hw_if0->hw_address, 6);
1224  clib_mem_unaligned (&arp0->ip4_over_ethernet[0].ip4.data_u32, u32) =
1225  if_addr0->data_u32;
1226 
1227  /* Hardware must be ethernet-like. */
1228  ASSERT (vec_len (hw_if0->hw_address) == 6);
1229 
1230  /* the rx nd tx ethernet headers wil overlap in the case
1231  * when we received a tagged VLAN=0 packet, but we are sending
1232  * back untagged */
1233  clib_memcpy (eth_tx, rewrite0, vec_len (rewrite0));
1234  vec_free (rewrite0);
1235 
1236  if (NULL == pa)
1237  {
1238  if (is_unnum0)
1239  {
1240  if (!arp_unnumbered (p0, sw_if_index0, conn_sw_if_index0))
1241  goto drop2;
1242  }
1243  }
1244 
1245  /* We are going to reply to this request, so, in the absence of
1246  errors, learn the sender */
1247  if (!error0)
1248  error0 = arp_learn (vnm, am, sw_if_index0,
1249  &arp0->ip4_over_ethernet[1]);
1250 
1251  vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1252  n_left_to_next, pi0, next0);
1253 
1254  n_replies_sent += 1;
1255  continue;
1256 
1257  drop1:
1258  if (arp0->ip4_over_ethernet[0].ip4.as_u32 ==
1259  arp0->ip4_over_ethernet[1].ip4.as_u32)
1260  {
1261  error0 = ETHERNET_ARP_ERROR_gratuitous_arp;
1262  goto drop2;
1263  }
1264  /* See if proxy arp is configured for the address */
1265  if (is_request0)
1266  {
1267  vnet_sw_interface_t *si;
1268  u32 this_addr = clib_net_to_host_u32
1269  (arp0->ip4_over_ethernet[1].ip4.as_u32);
1270  u32 fib_index0;
1271 
1272  si = vnet_get_sw_interface (vnm, sw_if_index0);
1273 
1275  goto drop2;
1276 
1277  fib_index0 = vec_elt (im4->fib_index_by_sw_if_index,
1278  sw_if_index0);
1279 
1280  vec_foreach (pa, am->proxy_arps)
1281  {
1282  u32 lo_addr = clib_net_to_host_u32 (pa->lo_addr.as_u32);
1283  u32 hi_addr = clib_net_to_host_u32 (pa->hi_addr.as_u32);
1284 
1285  /* an ARP request hit in the proxy-arp table? */
1286  if ((this_addr >= lo_addr && this_addr <= hi_addr) &&
1287  (fib_index0 == pa->fib_index))
1288  {
1289  proxy_src.as_u32 =
1290  arp0->ip4_over_ethernet[1].ip4.data_u32;
1291 
1292  /*
1293  * change the interface address to the proxied
1294  */
1295  if_addr0 = &proxy_src;
1296  is_unnum0 = 0;
1297  n_proxy_arp_replies_sent++;
1298  goto send_reply;
1299  }
1300  }
1301  }
1302 
1303  drop2:
1304 
1305  next0 = ARP_INPUT_NEXT_DROP;
1306  p0->error = node->errors[error0];
1307 
1308  vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1309  n_left_to_next, pi0, next0);
1310  }
1311 
1312  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1313  }
1314 
1315  vlib_error_count (vm, node->node_index,
1316  ETHERNET_ARP_ERROR_replies_sent,
1317  n_replies_sent - n_proxy_arp_replies_sent);
1318 
1319  vlib_error_count (vm, node->node_index,
1320  ETHERNET_ARP_ERROR_proxy_arp_replies_sent,
1321  n_proxy_arp_replies_sent);
1322  return frame->n_vectors;
1323 }
1324 
1325 static char *ethernet_arp_error_strings[] = {
1326 #define _(sym,string) string,
1328 #undef _
1329 };
1330 
1331 /* *INDENT-OFF* */
1333 {
1334  .function = arp_input,
1335  .name = "arp-input",
1336  .vector_size = sizeof (u32),
1337  .n_errors = ETHERNET_ARP_N_ERROR,
1338  .error_strings = ethernet_arp_error_strings,
1339  .n_next_nodes = ARP_INPUT_N_NEXT,
1340  .next_nodes = {
1341  [ARP_INPUT_NEXT_DROP] = "error-drop",
1342  [ARP_INPUT_NEXT_REPLY_TX] = "interface-output",
1343  },
1344  .format_buffer = format_ethernet_arp_header,
1345  .format_trace = format_ethernet_arp_input_trace,
1346 };
1347 /* *INDENT-ON* */
1348 
1349 static int
1350 ip4_arp_entry_sort (void *a1, void *a2)
1351 {
1352  ethernet_arp_ip4_entry_t *e1 = a1;
1353  ethernet_arp_ip4_entry_t *e2 = a2;
1354 
1355  int cmp;
1356  vnet_main_t *vnm = vnet_get_main ();
1357 
1358  cmp = vnet_sw_interface_compare (vnm, e1->sw_if_index, e2->sw_if_index);
1359  if (!cmp)
1360  cmp = ip4_address_compare (&e1->ip4_address, &e2->ip4_address);
1361  return cmp;
1362 }
1363 
1366 {
1368  return am->ip4_entry_pool;
1369 }
1370 
1373 {
1375  ethernet_arp_ip4_entry_t *n, *ns = 0;
1376 
1377  /* *INDENT-OFF* */
1378  pool_foreach (n, am->ip4_entry_pool, ({
1379  if (sw_if_index != ~0 && n->sw_if_index != sw_if_index)
1380  continue;
1381  vec_add1 (ns, n[0]);
1382  }));
1383  /* *INDENT-ON* */
1384 
1385  if (ns)
1387  return ns;
1388 }
1389 
1390 static clib_error_t *
1392  unformat_input_t * input, vlib_cli_command_t * cmd)
1393 {
1394  vnet_main_t *vnm = vnet_get_main ();
1396  ethernet_arp_ip4_entry_t *e, *es;
1398  clib_error_t *error = 0;
1399  u32 sw_if_index;
1400 
1401  /* Filter entries by interface if given. */
1402  sw_if_index = ~0;
1403  (void) unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index);
1404 
1405  es = ip4_neighbor_entries (sw_if_index);
1406  if (es)
1407  {
1408  vlib_cli_output (vm, "%U", format_ethernet_arp_ip4_entry, vnm, 0);
1409  vec_foreach (e, es)
1410  {
1411  vlib_cli_output (vm, "%U", format_ethernet_arp_ip4_entry, vnm, e);
1412  }
1413  vec_free (es);
1414  }
1415 
1416  if (vec_len (am->proxy_arps))
1417  {
1418  vlib_cli_output (vm, "Proxy arps enabled for:");
1419  vec_foreach (pa, am->proxy_arps)
1420  {
1421  vlib_cli_output (vm, "Fib_index %d %U - %U ",
1422  pa->fib_index,
1424  format_ip4_address, &pa->hi_addr);
1425  }
1426  }
1427 
1428  return error;
1429 }
1430 
1431 /*?
1432  * Display all the IPv4 ARP entries.
1433  *
1434  * @cliexpar
1435  * Example of how to display the IPv4 ARP table:
1436  * @cliexstart{show ip arp}
1437  * Time FIB IP4 Flags Ethernet Interface
1438  * 346.3028 0 6.1.1.3 de:ad:be:ef:ba:be GigabitEthernet2/0/0
1439  * 3077.4271 0 6.1.1.4 S de:ad:be:ef:ff:ff GigabitEthernet2/0/0
1440  * 2998.6409 1 6.2.2.3 de:ad:be:ef:00:01 GigabitEthernet2/0/0
1441  * Proxy arps enabled for:
1442  * Fib_index 0 6.0.0.1 - 6.0.0.11
1443  * @cliexend
1444  ?*/
1445 /* *INDENT-OFF* */
1446 VLIB_CLI_COMMAND (show_ip4_arp_command, static) = {
1447  .path = "show ip arp",
1448  .function = show_ip4_arp,
1449  .short_help = "show ip arp",
1450 };
1451 /* *INDENT-ON* */
1452 
1453 typedef struct
1454 {
1455  pg_edit_t l2_type, l3_type;
1456  pg_edit_t n_l2_address_bytes, n_l3_address_bytes;
1458  struct
1459  {
1462  } ip4_over_ethernet[2];
1464 
1465 static inline void
1467 {
1468  /* Initialize fields that are not bit fields in the IP header. */
1469 #define _(f) pg_edit_init (&p->f, ethernet_arp_header_t, f);
1470  _(l2_type);
1471  _(l3_type);
1472  _(n_l2_address_bytes);
1473  _(n_l3_address_bytes);
1474  _(opcode);
1475  _(ip4_over_ethernet[0].ethernet);
1476  _(ip4_over_ethernet[0].ip4);
1477  _(ip4_over_ethernet[1].ethernet);
1478  _(ip4_over_ethernet[1].ip4);
1479 #undef _
1480 }
1481 
1482 uword
1483 unformat_pg_arp_header (unformat_input_t * input, va_list * args)
1484 {
1485  pg_stream_t *s = va_arg (*args, pg_stream_t *);
1487  u32 group_index;
1488 
1489  p = pg_create_edit_group (s, sizeof (p[0]), sizeof (ethernet_arp_header_t),
1490  &group_index);
1492 
1493  /* Defaults. */
1494  pg_edit_set_fixed (&p->l2_type, ETHERNET_ARP_HARDWARE_TYPE_ethernet);
1495  pg_edit_set_fixed (&p->l3_type, ETHERNET_TYPE_IP4);
1498 
1499  if (!unformat (input, "%U: %U/%U -> %U/%U",
1510  {
1511  /* Free up any edits we may have added. */
1512  pg_free_edit_group (s);
1513  return 0;
1514  }
1515  return 1;
1516 }
1517 
1518 clib_error_t *
1520 {
1522 
1523  am->limit_arp_cache_size = arp_limit;
1524  return 0;
1525 }
1526 
1527 /**
1528  * @brief Control Plane hook to remove an ARP entry
1529  */
1530 int
1532  u32 sw_if_index, void *a_arg)
1533 {
1534  ethernet_arp_ip4_over_ethernet_address_t *a = a_arg;
1536 
1537  args.sw_if_index = sw_if_index;
1539  clib_memcpy (&args.a, a, sizeof (*a));
1540 
1542  (u8 *) & args, sizeof (args));
1543  return 0;
1544 }
1545 
1546 /**
1547  * @brief Internally generated event to flush the ARP cache on an
1548  * interface state change event.
1549  * A flush will remove dynamic ARP entries, and for statics remove the MAC
1550  * address from the corresponding adjacencies.
1551  */
1552 static int
1554  u32 sw_if_index, void *a_arg)
1555 {
1556  ethernet_arp_ip4_over_ethernet_address_t *a = a_arg;
1558 
1559  args.sw_if_index = sw_if_index;
1561  clib_memcpy (&args.a, a, sizeof (*a));
1562 
1564  (u8 *) & args, sizeof (args));
1565  return 0;
1566 }
1567 
1568 /**
1569  * @brief Internally generated event to populate the ARP cache on an
1570  * interface state change event.
1571  * For static entries this will re-source the adjacencies.
1572  *
1573  * @param sw_if_index The interface on which the ARP entires are acted
1574  */
1575 static int
1577  u32 sw_if_index, void *a_arg)
1578 {
1579  ethernet_arp_ip4_over_ethernet_address_t *a = a_arg;
1581 
1582  args.sw_if_index = sw_if_index;
1584  clib_memcpy (&args.a, a, sizeof (*a));
1585 
1587  (u8 *) & args, sizeof (args));
1588  return 0;
1589 }
1590 
1591 /**
1592  * @brief publish wildcard arp event
1593  * @param sw_if_index The interface on which the ARP entires are acted
1594  */
1595 static int
1596 vnet_arp_wc_publish (u32 sw_if_index, void *a_arg)
1597 {
1598  ethernet_arp_ip4_over_ethernet_address_t *a = a_arg;
1601  .sw_if_index = sw_if_index,
1602  .a = *a
1603  };
1604 
1606  (u8 *) & args, sizeof (args));
1607  return 0;
1608 }
1609 
1610 static void
1613  args)
1614 {
1618  uword et = am->wc_ip4_arp_publisher_et;
1619 
1620  if (ni == (uword) ~ 0)
1621  return;
1622  wc_arp_report_t *r =
1623  vlib_process_signal_event_data (vm, ni, et, 1, sizeof *r);
1624  r->ip4 = args->a.ip4.as_u32;
1625  r->sw_if_index = args->sw_if_index;
1626  memcpy (r->mac, args->a.ethernet, sizeof r->mac);
1627 }
1628 
1629 void
1630 wc_arp_set_publisher_node (uword node_index, uword event_type)
1631 {
1633  am->wc_ip4_arp_publisher_node = node_index;
1634  am->wc_ip4_arp_publisher_et = event_type;
1635 }
1636 
1637 /*
1638  * arp_add_del_interface_address
1639  *
1640  * callback when an interface address is added or deleted
1641  */
1642 static void
1644  uword opaque,
1645  u32 sw_if_index,
1647  u32 address_length,
1648  u32 if_address_index, u32 is_del)
1649 {
1650  /*
1651  * Flush the ARP cache of all entries covered by the address
1652  * that is being removed.
1653  */
1656 
1657  if (vec_len (am->ethernet_arp_by_sw_if_index) <= sw_if_index)
1658  return;
1659 
1660  if (is_del)
1661  {
1663  u32 i, *to_delete = 0;
1664  hash_pair_t *pair;
1665 
1666  eai = &am->ethernet_arp_by_sw_if_index[sw_if_index];
1667 
1668  /* *INDENT-OFF* */
1669  hash_foreach_pair (pair, eai->arp_entries,
1670  ({
1671  e = pool_elt_at_index(am->ip4_entry_pool,
1672  pair->value[0]);
1673  if (ip4_destination_matches_route (im, &e->ip4_address,
1674  address, address_length))
1675  {
1676  vec_add1 (to_delete, e - am->ip4_entry_pool);
1677  }
1678  }));
1679  /* *INDENT-ON* */
1680 
1681  for (i = 0; i < vec_len (to_delete); i++)
1682  {
1683  ethernet_arp_ip4_over_ethernet_address_t delme;
1684  e = pool_elt_at_index (am->ip4_entry_pool, to_delete[i]);
1685 
1686  clib_memcpy (&delme.ethernet, e->ethernet_address, 6);
1687  delme.ip4.as_u32 = e->ip4_address.as_u32;
1688 
1690  e->sw_if_index, &delme);
1691  }
1692 
1693  vec_free (to_delete);
1694  }
1695 }
1696 
1697 static void
1699  uword opaque,
1700  u32 sw_if_index, u32 new_fib_index, u32 old_fib_index)
1701 {
1705  hash_pair_t *pair;
1706 
1707  /*
1708  * the IP table that the interface is bound to has changed.
1709  * reinstall all the adj fibs.
1710  */
1711 
1712  if (vec_len (am->ethernet_arp_by_sw_if_index) <= sw_if_index)
1713  return;
1714 
1715  eai = &am->ethernet_arp_by_sw_if_index[sw_if_index];
1716 
1717  /* *INDENT-OFF* */
1718  hash_foreach_pair (pair, eai->arp_entries,
1719  ({
1720  e = pool_elt_at_index(am->ip4_entry_pool,
1721  pair->value[0]);
1722  /*
1723  * remove the adj-fib from the old table and add to the new
1724  */
1725  arp_adj_fib_remove(e, old_fib_index);
1726  arp_adj_fib_add(e, new_fib_index);
1727  }));
1728  /* *INDENT-ON* */
1729 
1730 }
1731 
1732 static clib_error_t *
1734 {
1736  ip4_main_t *im = &ip4_main;
1737  clib_error_t *error;
1738  pg_node_t *pn;
1739 
1740  if ((error = vlib_call_init_function (vm, ethernet_init)))
1741  return error;
1742 
1743  ethernet_register_input_type (vm, ETHERNET_TYPE_ARP, arp_input_node.index);
1744 
1745  pn = pg_get_node (arp_input_node.index);
1747 
1748  am->opcode_by_name = hash_create_string (0, sizeof (uword));
1749 #define _(o) hash_set_mem (am->opcode_by_name, #o, ETHERNET_ARP_OPCODE_##o);
1751 #undef _
1752 
1753  /* $$$ configurable */
1754  am->limit_arp_cache_size = 50000;
1755 
1756  am->pending_resolutions_by_address = hash_create (0, sizeof (uword));
1757  am->mac_changes_by_address = hash_create (0, sizeof (uword));
1758  am->wc_ip4_arp_publisher_node = (uword) ~ 0;
1759 
1760  /* don't trace ARP error packets */
1761  {
1762  vlib_node_runtime_t *rt =
1764 
1765 #define _(a,b) \
1766  vnet_pcap_drop_trace_filter_add_del \
1767  (rt->errors[ETHERNET_ARP_ERROR_##a], \
1768  1 /* is_add */);
1770 #undef _
1771  }
1772 
1775  cb.function_opaque = 0;
1777 
1779  cbt.function = arp_table_bind;
1780  cbt.function_opaque = 0;
1781  vec_add1 (im->table_bind_callbacks, cbt);
1782 
1783  return 0;
1784 }
1785 
1787 
1788 static void
1790 {
1792 
1796  pool_put (am->ip4_entry_pool, e);
1797 }
1798 
1799 static inline int
1802  * args)
1803 {
1807 
1808  if (vec_len (am->ethernet_arp_by_sw_if_index) <= args->sw_if_index)
1809  return 0;
1810 
1811  eai = &am->ethernet_arp_by_sw_if_index[args->sw_if_index];
1812 
1813  e = arp_entry_find (eai, &args->a.ip4);
1814 
1815  if (NULL != e)
1816  {
1819  arp_entry_free (eai, e);
1820  }
1821 
1822  return 0;
1823 }
1824 
1825 static int
1828  * args)
1829 {
1833 
1834  if (vec_len (am->ethernet_arp_by_sw_if_index) <= args->sw_if_index)
1835  return 0;
1836 
1837  eai = &am->ethernet_arp_by_sw_if_index[args->sw_if_index];
1838 
1839  e = arp_entry_find (eai, &args->a.ip4);
1840 
1841  if (NULL != e)
1842  {
1845 
1846  /*
1847  * The difference between flush and unset, is that an unset
1848  * means delete for static and dynamic entries. A flush
1849  * means delete only for dynamic. Flushing is what the DP
1850  * does in response to interface events. unset is only done
1851  * by the control plane.
1852  */
1854  {
1856  }
1858  {
1859  arp_entry_free (eai, e);
1860  }
1861  }
1862  return (0);
1863 }
1864 
1865 static int
1868  * args)
1869 {
1873 
1875  eai = &am->ethernet_arp_by_sw_if_index[args->sw_if_index];
1876 
1877  e = arp_entry_find (eai, &args->a.ip4);
1878 
1879  if (NULL != e)
1880  {
1883  }
1884  return (0);
1885 }
1886 
1887 static void
1889  * a)
1890 {
1892  ASSERT (vlib_get_thread_index () == 0);
1893 
1896  else if (a->flags & ETHERNET_ARP_ARGS_FLUSH)
1898  else if (a->flags & ETHERNET_ARP_ARGS_POPULATE)
1900  else if (a->flags & ETHERNET_ARP_ARGS_WC_PUB)
1902  else
1904 }
1905 
1906 /**
1907  * @brief Invoked when the interface's admin state changes
1908  */
1909 static clib_error_t *
1911  u32 sw_if_index, u32 flags)
1912 {
1915  u32 i, *to_delete = 0;
1916 
1917  /* *INDENT-OFF* */
1918  pool_foreach (e, am->ip4_entry_pool,
1919  ({
1920  if (e->sw_if_index == sw_if_index)
1921  vec_add1 (to_delete,
1922  e - am->ip4_entry_pool);
1923  }));
1924  /* *INDENT-ON* */
1925 
1926  for (i = 0; i < vec_len (to_delete); i++)
1927  {
1928  ethernet_arp_ip4_over_ethernet_address_t delme;
1929  e = pool_elt_at_index (am->ip4_entry_pool, to_delete[i]);
1930 
1931  clib_memcpy (&delme.ethernet, e->ethernet_address, 6);
1932  delme.ip4.as_u32 = e->ip4_address.as_u32;
1933 
1934  if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
1935  {
1937  }
1938  else
1939  {
1941  }
1942 
1943  }
1944  vec_free (to_delete);
1945 
1946  return 0;
1947 }
1948 
1950 
1951 static void
1952 increment_ip4_and_mac_address (ethernet_arp_ip4_over_ethernet_address_t * a)
1953 {
1954  u8 old;
1955  int i;
1956 
1957  for (i = 3; i >= 0; i--)
1958  {
1959  old = a->ip4.as_u8[i];
1960  a->ip4.as_u8[i] += 1;
1961  if (old < a->ip4.as_u8[i])
1962  break;
1963  }
1964 
1965  for (i = 5; i >= 0; i--)
1966  {
1967  old = a->ethernet[i];
1968  a->ethernet[i] += 1;
1969  if (old < a->ethernet[i])
1970  break;
1971  }
1972 }
1973 
1974 int
1976  u32 sw_if_index, void *a_arg,
1977  int is_static, int is_no_fib_entry)
1978 {
1979  ethernet_arp_ip4_over_ethernet_address_t *a = a_arg;
1981 
1982  args.sw_if_index = sw_if_index;
1983  args.is_static = is_static;
1984  args.is_no_fib_entry = is_no_fib_entry;
1985  args.flags = 0;
1986  clib_memcpy (&args.a, a, sizeof (*a));
1987 
1989  (u8 *) & args, sizeof (args));
1990  return 0;
1991 }
1992 
1993 void
1995 {
1998 
1999  vec_foreach (pa, am->proxy_arps)
2000  {
2001  if (!cb (&pa->lo_addr, &pa->hi_addr, pa->fib_index, data))
2002  break;
2003  }
2004 }
2005 
2006 int
2008  ip4_address_t * hi_addr, u32 fib_index, int is_del)
2009 {
2012  u32 found_at_index = ~0;
2013 
2014  vec_foreach (pa, am->proxy_arps)
2015  {
2016  if (pa->lo_addr.as_u32 == lo_addr->as_u32 &&
2017  pa->hi_addr.as_u32 == hi_addr->as_u32 && pa->fib_index == fib_index)
2018  {
2019  found_at_index = pa - am->proxy_arps;
2020  break;
2021  }
2022  }
2023 
2024  if (found_at_index != ~0)
2025  {
2026  /* Delete, otherwise it's already in the table */
2027  if (is_del)
2028  vec_delete (am->proxy_arps, 1, found_at_index);
2029  return 0;
2030  }
2031  /* delete, no such entry */
2032  if (is_del)
2033  return VNET_API_ERROR_NO_SUCH_ENTRY;
2034 
2035  /* add, not in table */
2036  vec_add2 (am->proxy_arps, pa, 1);
2037  pa->lo_addr.as_u32 = lo_addr->as_u32;
2038  pa->hi_addr.as_u32 = hi_addr->as_u32;
2039  pa->fib_index = fib_index;
2040  return 0;
2041 }
2042 
2043 /*
2044  * Remove any proxy arp entries asdociated with the
2045  * specificed fib.
2046  */
2047 int
2049 {
2052  u32 *entries_to_delete = 0;
2053  u32 fib_index;
2054  int i;
2055 
2056  fib_index = fib_table_find (FIB_PROTOCOL_IP4, fib_id);
2057  if (~0 == fib_index)
2058  return VNET_API_ERROR_NO_SUCH_ENTRY;
2059 
2060  vec_foreach (pa, am->proxy_arps)
2061  {
2062  if (pa->fib_index == fib_index)
2063  {
2064  vec_add1 (entries_to_delete, pa - am->proxy_arps);
2065  }
2066  }
2067 
2068  for (i = 0; i < vec_len (entries_to_delete); i++)
2069  {
2070  vec_delete (am->proxy_arps, 1, entries_to_delete[i]);
2071  }
2072 
2073  vec_free (entries_to_delete);
2074 
2075  return 0;
2076 }
2077 
2078 static clib_error_t *
2080  unformat_input_t * input, vlib_cli_command_t * cmd)
2081 {
2082  vnet_main_t *vnm = vnet_get_main ();
2083  u32 sw_if_index;
2084  ethernet_arp_ip4_over_ethernet_address_t lo_addr, hi_addr, addr;
2085  int addr_valid = 0;
2086  int is_del = 0;
2087  int count = 1;
2088  u32 fib_index = 0;
2089  u32 fib_id;
2090  int is_static = 0;
2091  int is_no_fib_entry = 0;
2092  int is_proxy = 0;
2093 
2094  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2095  {
2096  /* set ip arp TenGigE1/1/0/1 1.2.3.4 aa:bb:... or aabb.ccdd... */
2097  if (unformat (input, "%U %U %U",
2098  unformat_vnet_sw_interface, vnm, &sw_if_index,
2099  unformat_ip4_address, &addr.ip4,
2100  unformat_ethernet_address, &addr.ethernet))
2101  addr_valid = 1;
2102 
2103  else if (unformat (input, "delete") || unformat (input, "del"))
2104  is_del = 1;
2105 
2106  else if (unformat (input, "static"))
2107  is_static = 1;
2108 
2109  else if (unformat (input, "no-fib-entry"))
2110  is_no_fib_entry = 1;
2111 
2112  else if (unformat (input, "count %d", &count))
2113  ;
2114 
2115  else if (unformat (input, "fib-id %d", &fib_id))
2116  {
2117  fib_index = fib_table_find (FIB_PROTOCOL_IP4, fib_id);
2118 
2119  if (~0 == fib_index)
2120  return clib_error_return (0, "fib ID %d doesn't exist\n", fib_id);
2121  }
2122 
2123  else if (unformat (input, "proxy %U - %U",
2124  unformat_ip4_address, &lo_addr.ip4,
2125  unformat_ip4_address, &hi_addr.ip4))
2126  is_proxy = 1;
2127  else
2128  break;
2129  }
2130 
2131  if (is_proxy)
2132  {
2133  (void) vnet_proxy_arp_add_del (&lo_addr.ip4, &hi_addr.ip4,
2134  fib_index, is_del);
2135  return 0;
2136  }
2137 
2138  if (addr_valid)
2139  {
2140  int i;
2141 
2142  for (i = 0; i < count; i++)
2143  {
2144  if (is_del == 0)
2145  {
2146  uword event_type, *event_data = 0;
2147 
2148  /* Park the debug CLI until the arp entry is installed */
2150  (vnm, &addr.ip4, vlib_current_process (vm),
2151  1 /* type */ , 0 /* data */ );
2152 
2154  (vnm, sw_if_index, &addr, is_static, is_no_fib_entry);
2155 
2157  event_type = vlib_process_get_events (vm, &event_data);
2158  vec_reset_length (event_data);
2159  if (event_type != 1)
2160  clib_warning ("event type %d unexpected", event_type);
2161  }
2162  else
2163  vnet_arp_unset_ip4_over_ethernet (vnm, sw_if_index, &addr);
2164 
2166  }
2167  }
2168  else
2169  {
2170  return clib_error_return (0, "unknown input `%U'",
2171  format_unformat_error, input);
2172  }
2173 
2174  return 0;
2175 }
2176 
2177 /* *INDENT-OFF* */
2178 /*?
2179  * Add or delete IPv4 ARP cache entries.
2180  *
2181  * @note 'set ip arp' options (e.g. delete, static, 'fib-id <id>',
2182  * 'count <number>', 'interface ip4_addr mac_addr') can be added in
2183  * any order and combination.
2184  *
2185  * @cliexpar
2186  * @parblock
2187  * Add or delete IPv4 ARP cache entries as follows. MAC Address can be in
2188  * either aa:bb:cc:dd:ee:ff format or aabb.ccdd.eeff format.
2189  * @cliexcmd{set ip arp GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2190  * @cliexcmd{set ip arp delete GigabitEthernet2/0/0 6.0.0.3 de:ad:be:ef:ba:be}
2191  *
2192  * To add or delete an IPv4 ARP cache entry to or from a specific fib
2193  * table:
2194  * @cliexcmd{set ip arp fib-id 1 GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2195  * @cliexcmd{set ip arp fib-id 1 delete GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2196  *
2197  * Add or delete IPv4 static ARP cache entries as follows:
2198  * @cliexcmd{set ip arp static GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2199  * @cliexcmd{set ip arp static delete GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2200  *
2201  * For testing / debugging purposes, the 'set ip arp' command can add or
2202  * delete multiple entries. Supply the 'count N' parameter:
2203  * @cliexcmd{set ip arp count 10 GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2204  * @endparblock
2205  ?*/
2206 VLIB_CLI_COMMAND (ip_arp_add_del_command, static) = {
2207  .path = "set ip arp",
2208  .short_help =
2209  "set ip arp [del] <intfc> <ip-address> <mac-address> [static] [no-fib-entry] [count <count>] [fib-id <fib-id>] [proxy <lo-addr> - <hi-addr>]",
2210  .function = ip_arp_add_del_command_fn,
2211 };
2212 /* *INDENT-ON* */
2213 
2214 static clib_error_t *
2217  input, vlib_cli_command_t * cmd)
2218 {
2219  vnet_main_t *vnm = vnet_get_main ();
2220  u32 sw_if_index;
2221  vnet_sw_interface_t *si;
2222  int enable = 0;
2223  int intfc_set = 0;
2224 
2225  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2226  {
2227  if (unformat (input, "%U", unformat_vnet_sw_interface,
2228  vnm, &sw_if_index))
2229  intfc_set = 1;
2230  else if (unformat (input, "enable") || unformat (input, "on"))
2231  enable = 1;
2232  else if (unformat (input, "disable") || unformat (input, "off"))
2233  enable = 0;
2234  else
2235  break;
2236  }
2237 
2238  if (intfc_set == 0)
2239  return clib_error_return (0, "unknown input '%U'",
2240  format_unformat_error, input);
2241 
2242  si = vnet_get_sw_interface (vnm, sw_if_index);
2243  ASSERT (si);
2244  if (enable)
2246  else
2248 
2249  return 0;
2250 }
2251 
2252 /* *INDENT-OFF* */
2253 /*?
2254  * Enable proxy-arp on an interface. The vpp stack will answer ARP
2255  * requests for the indicated address range. Multiple proxy-arp
2256  * ranges may be provisioned.
2257  *
2258  * @note Proxy ARP as a technology is infamous for blackholing traffic.
2259  * Also, the underlying implementation has not been performance-tuned.
2260  * Avoid creating an unnecessarily large set of ranges.
2261  *
2262  * @cliexpar
2263  * To enable proxy arp on a range of addresses, use:
2264  * @cliexcmd{set ip arp proxy 6.0.0.1 - 6.0.0.11}
2265  * Append 'del' to delete a range of proxy ARP addresses:
2266  * @cliexcmd{set ip arp proxy 6.0.0.1 - 6.0.0.11 del}
2267  * You must then specifically enable proxy arp on individual interfaces:
2268  * @cliexcmd{set interface proxy-arp GigabitEthernet0/8/0 enable}
2269  * To disable proxy arp on an individual interface:
2270  * @cliexcmd{set interface proxy-arp GigabitEthernet0/8/0 disable}
2271  ?*/
2272 VLIB_CLI_COMMAND (set_int_proxy_enable_command, static) = {
2273  .path = "set interface proxy-arp",
2274  .short_help =
2275  "set interface proxy-arp <intfc> [enable|disable]",
2276  .function = set_int_proxy_arp_command_fn,
2277 };
2278 /* *INDENT-ON* */
2279 
2280 
2281 /*
2282  * ARP/ND Termination in a L2 Bridge Domain based on IP4/IP6 to MAC
2283  * hash tables mac_by_ip4 and mac_by_ip6 for each BD.
2284  */
2285 typedef enum
2286 {
2290 } arp_term_next_t;
2291 
2293 
2294 static uword
2296  vlib_node_runtime_t * node, vlib_frame_t * frame)
2297 {
2298  l2input_main_t *l2im = &l2input_main;
2299  u32 n_left_from, next_index, *from, *to_next;
2300  u32 n_replies_sent = 0;
2301  u16 last_bd_index = ~0;
2302  l2_bridge_domain_t *last_bd_config = 0;
2303  l2_input_config_t *cfg0;
2304 
2305  from = vlib_frame_vector_args (frame);
2306  n_left_from = frame->n_vectors;
2307  next_index = node->cached_next_index;
2308 
2309  while (n_left_from > 0)
2310  {
2311  u32 n_left_to_next;
2312 
2313  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2314 
2315  while (n_left_from > 0 && n_left_to_next > 0)
2316  {
2317  vlib_buffer_t *p0;
2318  ethernet_header_t *eth0;
2319  ethernet_arp_header_t *arp0;
2320  ip6_header_t *iph0;
2321  u8 *l3h0;
2322  u32 pi0, error0, next0, sw_if_index0;
2323  u16 ethertype0;
2324  u16 bd_index0;
2325  u32 ip0;
2326  u8 *macp0;
2327 
2328  pi0 = from[0];
2329  to_next[0] = pi0;
2330  from += 1;
2331  to_next += 1;
2332  n_left_from -= 1;
2333  n_left_to_next -= 1;
2334 
2335  p0 = vlib_get_buffer (vm, pi0);
2336  // Terminate only local (SHG == 0) ARP
2337  if (vnet_buffer (p0)->l2.shg != 0)
2338  goto next_l2_feature;
2339 
2340  eth0 = vlib_buffer_get_current (p0);
2341  l3h0 = (u8 *) eth0 + vnet_buffer (p0)->l2.l2_len;
2342  ethertype0 = clib_net_to_host_u16 (*(u16 *) (l3h0 - 2));
2343  arp0 = (ethernet_arp_header_t *) l3h0;
2344 
2345  if (PREDICT_FALSE ((ethertype0 != ETHERNET_TYPE_ARP) ||
2346  (arp0->opcode !=
2347  clib_host_to_net_u16
2348  (ETHERNET_ARP_OPCODE_request))))
2349  goto check_ip6_nd;
2350 
2351  /* Must be ARP request packet here */
2352  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) &&
2353  (p0->flags & VLIB_BUFFER_IS_TRACED)))
2354  {
2355  u8 *t0 = vlib_add_trace (vm, node, p0,
2356  sizeof (ethernet_arp_input_trace_t));
2357  clib_memcpy (t0, l3h0, sizeof (ethernet_arp_input_trace_t));
2358  }
2359 
2360  error0 = ETHERNET_ARP_ERROR_replies_sent;
2361  error0 =
2362  (arp0->l2_type !=
2363  clib_net_to_host_u16 (ETHERNET_ARP_HARDWARE_TYPE_ethernet)
2364  ? ETHERNET_ARP_ERROR_l2_type_not_ethernet : error0);
2365  error0 =
2366  (arp0->l3_type !=
2367  clib_net_to_host_u16 (ETHERNET_TYPE_IP4) ?
2368  ETHERNET_ARP_ERROR_l3_type_not_ip4 : error0);
2369 
2370  sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
2371 
2372  if (error0)
2373  goto drop;
2374 
2375  /* Trash ARP packets whose ARP-level source addresses do not
2376  match, or if requester address is mcast */
2377  if (PREDICT_FALSE
2378  (memcmp (eth0->src_address, arp0->ip4_over_ethernet[0].ethernet,
2379  sizeof (eth0->src_address)) ||
2380  ethernet_address_cast (arp0->ip4_over_ethernet[0].ethernet)))
2381  {
2382  error0 = ETHERNET_ARP_ERROR_l2_address_mismatch;
2383  goto drop;
2384  }
2385  if (PREDICT_FALSE
2386  (ip4_address_is_multicast (&arp0->ip4_over_ethernet[0].ip4)))
2387  {
2388  error0 = ETHERNET_ARP_ERROR_l3_src_address_not_local;
2389  goto drop;
2390  }
2391 
2392  /* Check if anyone want ARP request events for L2 BDs */
2393  {
2395  if (am->wc_ip4_arp_publisher_node != (uword) ~ 0)
2396  vnet_arp_wc_publish (sw_if_index0, &arp0->ip4_over_ethernet[0]);
2397  }
2398 
2399  /* lookup BD mac_by_ip4 hash table for MAC entry */
2400  ip0 = arp0->ip4_over_ethernet[1].ip4.as_u32;
2401  bd_index0 = vnet_buffer (p0)->l2.bd_index;
2402  if (PREDICT_FALSE ((bd_index0 != last_bd_index)
2403  || (last_bd_index == (u16) ~ 0)))
2404  {
2405  last_bd_index = bd_index0;
2406  last_bd_config = vec_elt_at_index (l2im->bd_configs, bd_index0);
2407  }
2408  macp0 = (u8 *) hash_get (last_bd_config->mac_by_ip4, ip0);
2409 
2410  if (PREDICT_FALSE (!macp0))
2411  goto next_l2_feature; /* MAC not found */
2412 
2413  /* MAC found, send ARP reply -
2414  Convert ARP request packet to ARP reply */
2415  arp0->opcode = clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply);
2416  arp0->ip4_over_ethernet[1] = arp0->ip4_over_ethernet[0];
2417  arp0->ip4_over_ethernet[0].ip4.as_u32 = ip0;
2418  clib_memcpy (arp0->ip4_over_ethernet[0].ethernet, macp0, 6);
2419  clib_memcpy (eth0->dst_address, eth0->src_address, 6);
2420  clib_memcpy (eth0->src_address, macp0, 6);
2421  n_replies_sent += 1;
2422 
2423  output_response:
2424  /* For BVI, need to use l2-fwd node to send ARP reply as
2425  l2-output node cannot output packet to BVI properly */
2426  cfg0 = vec_elt_at_index (l2im->configs, sw_if_index0);
2427  if (PREDICT_FALSE (cfg0->bvi))
2428  {
2429  vnet_buffer (p0)->l2.feature_bitmap |= L2INPUT_FEAT_FWD;
2430  vnet_buffer (p0)->sw_if_index[VLIB_RX] = 0;
2431  goto next_l2_feature;
2432  }
2433 
2434  /* Send ARP/ND reply back out input interface through l2-output */
2435  vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
2436  next0 = ARP_TERM_NEXT_L2_OUTPUT;
2437  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2438  to_next, n_left_to_next, pi0,
2439  next0);
2440  continue;
2441 
2442  check_ip6_nd:
2443  /* IP6 ND event notification or solicitation handling to generate
2444  local response instead of flooding */
2445  iph0 = (ip6_header_t *) l3h0;
2446  if (PREDICT_FALSE (ethertype0 == ETHERNET_TYPE_IP6 &&
2447  iph0->protocol == IP_PROTOCOL_ICMP6 &&
2449  (&iph0->src_address)))
2450  {
2451  sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
2452  if (vnet_ip6_nd_term
2453  (vm, node, p0, eth0, iph0, sw_if_index0,
2454  vnet_buffer (p0)->l2.bd_index))
2455  goto output_response;
2456  }
2457 
2458  next_l2_feature:
2459  {
2461  L2INPUT_FEAT_ARP_TERM);
2462  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2463  to_next, n_left_to_next,
2464  pi0, next0);
2465  continue;
2466  }
2467 
2468  drop:
2469  if (0 == arp0->ip4_over_ethernet[0].ip4.as_u32 ||
2470  (arp0->ip4_over_ethernet[0].ip4.as_u32 ==
2471  arp0->ip4_over_ethernet[1].ip4.as_u32))
2472  {
2473  error0 = ETHERNET_ARP_ERROR_gratuitous_arp;
2474  }
2475  next0 = ARP_TERM_NEXT_DROP;
2476  p0->error = node->errors[error0];
2477 
2478  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2479  to_next, n_left_to_next, pi0,
2480  next0);
2481  }
2482 
2483  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2484  }
2485 
2486  vlib_error_count (vm, node->node_index,
2487  ETHERNET_ARP_ERROR_replies_sent, n_replies_sent);
2488  return frame->n_vectors;
2489 }
2490 
2491 /* *INDENT-OFF* */
2493  .function = arp_term_l2bd,
2494  .name = "arp-term-l2bd",
2495  .vector_size = sizeof (u32),
2496  .n_errors = ETHERNET_ARP_N_ERROR,
2497  .error_strings = ethernet_arp_error_strings,
2498  .n_next_nodes = ARP_TERM_N_NEXT,
2499  .next_nodes = {
2500  [ARP_TERM_NEXT_L2_OUTPUT] = "l2-output",
2501  [ARP_TERM_NEXT_DROP] = "error-drop",
2502  },
2503  .format_buffer = format_ethernet_arp_header,
2504  .format_trace = format_arp_term_input_trace,
2505 };
2506 /* *INDENT-ON* */
2507 
2508 clib_error_t *
2510 {
2511  // Initialize the feature next-node indexes
2513  arp_term_l2bd_node.index,
2517  return 0;
2518 }
2519 
2521 
2522 void
2524 {
2525  if (e->sw_if_index == sw_if_index)
2526  {
2529  }
2530 }
2531 
2532 void
2534 {
2537  adj_index_t ai;
2538 
2539  /* *INDENT-OFF* */
2540  pool_foreach (e, am->ip4_entry_pool,
2541  ({
2542  change_arp_mac (sw_if_index, e);
2543  }));
2544  /* *INDENT-ON* */
2545 
2546  ai = adj_glean_get (FIB_PROTOCOL_IP4, sw_if_index);
2547 
2548  if (ADJ_INDEX_INVALID != ai)
2550 }
2551 
2552 void
2554 {
2555  ip4_main_t *i4m = &ip4_main;
2556  ip4_address_t *ip4_addr = ip4_interface_first_address (i4m, sw_if_index, 0);
2557 
2558  send_ip4_garp_w_addr (vm, ip4_addr, sw_if_index);
2559 }
2560 
2561 void
2563  const ip4_address_t * ip4_addr, u32 sw_if_index)
2564 {
2565  ip4_main_t *i4m = &ip4_main;
2566  vnet_main_t *vnm = vnet_get_main ();
2567  u8 *rewrite, rewrite_len;
2568  vnet_hw_interface_t *hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
2569 
2570  if (ip4_addr)
2571  {
2572  clib_warning ("Sending GARP for IP4 address %U on sw_if_idex %d",
2573  format_ip4_address, ip4_addr, sw_if_index);
2574 
2575  /* Form GARP packet for output - Gratuitous ARP is an ARP request packet
2576  where the interface IP/MAC pair is used for both source and request
2577  MAC/IP pairs in the request */
2578  u32 bi = 0;
2580  (vm, &i4m->ip4_arp_request_packet_template, &bi);
2581 
2582  if (!h)
2583  return;
2584 
2585  clib_memcpy (h->ip4_over_ethernet[0].ethernet, hi->hw_address,
2586  sizeof (h->ip4_over_ethernet[0].ethernet));
2587  clib_memcpy (h->ip4_over_ethernet[1].ethernet, hi->hw_address,
2588  sizeof (h->ip4_over_ethernet[1].ethernet));
2589  h->ip4_over_ethernet[0].ip4 = ip4_addr[0];
2590  h->ip4_over_ethernet[1].ip4 = ip4_addr[0];
2591 
2592  /* Setup MAC header with ARP Etype and broadcast DMAC */
2593  vlib_buffer_t *b = vlib_get_buffer (vm, bi);
2594  rewrite =
2595  ethernet_build_rewrite (vnm, sw_if_index, VNET_LINK_ARP,
2597  rewrite_len = vec_len (rewrite);
2598  vlib_buffer_advance (b, -rewrite_len);
2600  clib_memcpy (e->dst_address, rewrite, rewrite_len);
2601  vec_free (rewrite);
2602 
2603  /* Send GARP packet out the specified interface */
2604  vnet_buffer (b)->sw_if_index[VLIB_RX] =
2605  vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index;
2607  u32 *to_next = vlib_frame_vector_args (f);
2608  to_next[0] = bi;
2609  f->n_vectors = 1;
2611  }
2612 }
2613 
2614 /*
2615  * fd.io coding-style-patch-verification: ON
2616  *
2617  * Local Variables:
2618  * eval: (c-set-style "gnu")
2619  * End:
2620  */
#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:1888
#define VNET_SW_INTERFACE_FLAG_UNNUMBERED
Definition: interface.h:667
vmrglw vmrglh hi
#define pool_next_index(P, I)
Return next occupied pool index after i, useful for safe iteration.
Definition: pool.h:469
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:34
#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:2295
#define hash_set(h, key, value)
Definition: hash.h:255
l2_input_config_t * configs
Definition: l2_input.h:66
An entry in a FIB table.
Definition: fib_entry.h:453
ip4_table_bind_function_t * function
Definition: ip4.h:82
#define CLIB_UNUSED(x)
Definition: clib.h:79
u8 * format_ethernet_arp_ip4_entry(u8 *s, va_list *va)
Definition: arp.c:249
ip4_add_del_interface_address_callback_t * add_del_interface_address_callbacks
Functions to call when interface address changes.
Definition: ip4.h:129
#define hash_unset(h, key)
Definition: hash.h:261
a
Definition: bitmap.h:537
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:1483
static void pg_ethernet_arp_header_init(pg_ethernet_arp_header_t *p)
Definition: arp.c:1466
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:1800
static void increment_ip4_and_mac_address(ethernet_arp_ip4_over_ethernet_address_t *a)
Definition: arp.c:1952
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:1643
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:1391
vnet_interface_main_t interface_main
Definition: vnet.h:56
pending_resolution_t * pending_resolutions
Definition: arp.c:78
void fib_entry_get_prefix(fib_node_index_t fib_entry_index, fib_prefix_t *pfx)
Definition: fib_entry.c:1616
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:388
#define NULL
Definition: clib.h:55
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:320
static f64 vlib_time_now(vlib_main_t *vm)
Definition: main.h:225
IP unicast adjacency.
Definition: adj.h:175
Information related to the source of a FIB entry.
Definition: fib_entry.h:345
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:2523
static u8 * format_ethernet_arp_header(u8 *s, va_list *va)
Definition: arp.c:202
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:2215
clib_error_t * ip4_set_arp_limit(u32 arp_limit)
Definition: arp.c:1519
static uword arp_input(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
Definition: arp.c:922
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:1231
struct ip_adjacency_t_::@43::@44 nbr
IP_LOOKUP_NEXT_ARP/IP_LOOKUP_NEXT_REWRITE.
void arp_update_adjacency(vnet_main_t *vnm, u32 sw_if_index, u32 ai)
Definition: arp.c:445
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:1698
static uword unformat_ethernet_arp_opcode_host_byte_order(unformat_input_t *input, va_list *args)
Definition: arp.c:161
#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:591
pg_edit_t l2_type
Definition: arp.c:1455
static vnet_sw_interface_t * vnet_get_sw_interface(vnet_main_t *vnm, u32 sw_if_index)
static int vnet_arp_wc_publish(u32 sw_if_index, void *a_arg)
publish wildcard arp event
Definition: arp.c:1596
u32 * fib_index_by_sw_if_index
Table index indexed by software interface.
Definition: ip4.h:111
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:419
uword * opcode_by_name
Definition: arp.c:74
unformat_function_t unformat_vnet_sw_interface
void vl_api_rpc_call_main_thread(void *fp, u8 *data, u32 data_length)
Definition: vlib_api.c:636
vlib_error_t * errors
Vector of errors for this node.
Definition: node.h:451
Definition: fib_entry.h:272
#define pool_get(P, E)
Allocate an object E from a pool P (unspecified alignment).
Definition: pool.h:227
pg_edit_t ethernet
Definition: arp.c:1460
ip6_address_t src_address
Definition: ip6_packet.h:347
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:67
#define vec_reset_length(v)
Reset vector length to zero NULL-pointer tolerant.
union ip_adjacency_t_::@43 sub_type
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:196
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:1866
u32 send_garp_na_process_node_index
Definition: arp.c:118
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:856
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:115
void arp_adj_fib_remove(ethernet_arp_ip4_entry_t *e, u32 fib_index)
Definition: arp.c:551
u32 ip4_fib_table_get_index_for_sw_if_index(u32 sw_if_index)
Definition: ip4_fib.c:226
format_function_t format_ip4_address
Definition: format.h:81
static ip_adjacency_t * adj_get(adj_index_t adj_index)
Get a pointer to an adjacency object from its index.
Definition: adj.h:370
pg_edit_t n_l3_address_bytes
Definition: arp.c:1456
u8 * format_ethernet_address(u8 *s, va_list *args)
Definition: format.c:44
#define VNET_SW_INTERFACE_FLAG_PROXY_ARP
Definition: interface.h:665
void * vlib_packet_template_get_packet(vlib_main_t *vm, vlib_packet_template_t *t, u32 *bi_result)
Definition: buffer.c:773
#define pool_foreach(VAR, POOL, BODY)
Iterate through pool.
Definition: pool.h:440
unformat_function_t unformat_ip4_address
Definition: format.h:76
ethernet_arp_ip4_over_ethernet_address_t ip4_over_ethernet[2]
Definition: arp_packet.h:136
#define VLIB_INIT_FUNCTION(x)
Definition: init.h:156
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:575
static uword ethernet_address_cast(u8 *a)
Definition: packet.h:67
pending_resolution_t * mac_changes
Definition: arp.c:82
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:607
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:1350
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:1994
#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:188
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:288
static int vnet_arp_flush_ip4_over_ethernet(vnet_main_t *vnm, u32 sw_if_index, void *a_arg)
Internally generated event to flush the ARP cache on an interface state change event.
Definition: arp.c:1553
#define foreach_ethernet_arp_opcode
Definition: arp_packet.h:61
uword * pending_resolutions_by_address
Definition: arp.c:77
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:1056
u16 fp_len
The mask length.
Definition: fib_types.h:192
#define vlib_call_init_function(vm, x)
Definition: init.h:227
static ethernet_arp_ip4_entry_t * arp_entry_find(ethernet_arp_interface_t *eai, const ip4_address_t *addr)
Definition: arp.c:408
int vnet_arp_unset_ip4_over_ethernet(vnet_main_t *vnm, u32 sw_if_index, void *a_arg)
Control Plane hook to remove an ARP entry.
Definition: arp.c:1531
#define hash_create_string(elts, value_bytes)
Definition: hash.h:690
pg_edit_t l3_type
Definition: arp.c:1455
static adj_walk_rc_t arp_mk_complete_walk(adj_index_t ai, void *ctx)
Definition: arp.c:427
Per-interface ARP configuration and state.
Definition: arp.c:44
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:275
#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:461
static ethernet_header_t * ethernet_buffer_get_header(vlib_buffer_t *b)
Definition: ethernet.h:380
#define foreach_ethernet_arp_error
Definition: arp.c:863
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:384
static void vlib_process_signal_event(vlib_main_t *vm, uword node_index, uword type_opaque, uword data)
Definition: node_funcs.h:952
Adjacency source.
Definition: fib_entry.h:104
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:211
uword type_opaque
Definition: arp.c:64
#define ETHERNET_ARP_ARGS_FLUSH
Definition: arp.c:110
ip4_address_t ip4_address
Definition: arp_packet.h:153
struct _unformat_input_t unformat_input_t
u32 sw_if_index
Definition: arp_packet.h:152
unsigned short u16
Definition: types.h:57
static u32 arp_learn(vnet_main_t *vnm, ethernet_arp_main_t *am, u32 sw_if_index, void *addr)
Definition: arp.c:914
ethernet_arp_ip4_entry_t * ip4_neighbors_pool(void)
Definition: arp.c:1365
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:202
u8 * ip_enabled_by_sw_if_index
Definition: ip4.h:117
#define pool_put(P, E)
Free an object E in pool P.
Definition: pool.h:273
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:846
static uword ip4_address_is_multicast(ip4_address_t *a)
Definition: ip4_packet.h:315
#define PREDICT_FALSE(x)
Definition: clib.h:105
This packet matches an "interface route" and packets need to be passed to ARP to find rewrite string ...
Definition: adj.h:68
ethernet_arp_interface_t * ethernet_arp_by_sw_if_index
Per interface state.
Definition: arp.c:91
u32 node_index
Node index.
Definition: node.h:473
static clib_error_t * ethernet_arp_init(vlib_main_t *vm)
Definition: arp.c:1733
#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:1228
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:135
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:2079
u8 * format_ethernet_type(u8 *s, va_list *args)
Definition: format.c:58
fib_node_index_t ip4_fib_table_lookup(const ip4_fib_t *fib, const ip4_address_t *addr, u32 len)
Definition: ip4_fib.c:293
static void arp_adj_fib_add(ethernet_arp_ip4_entry_t *e, u32 fib_index)
Definition: arp.c:533
ethernet_proxy_arp_t * proxy_arps
Definition: arp.c:94
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:2553
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:153
#define UNFORMAT_END_OF_INPUT
Definition: format.h:143
u16 n_vectors
Definition: node.h:380
static_always_inline uword vlib_get_thread_index(void)
Definition: threads.h:221
static void arp_mk_incomplete(adj_index_t ai)
Definition: arp.c:394
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:1456
#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:72
static ethernet_arp_main_t ethernet_arp_main
Definition: arp.c:100
static ip4_fib_t * ip4_fib_get(u32 index)
Get the FIB at the given index.
Definition: ip4_fib.h:117
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:86
static char * ethernet_arp_error_strings[]
Definition: arp.c:1325
#define ETHERNET_ARP_ARGS_POPULATE
Definition: arp.c:111
#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:81
uword wc_ip4_arp_publisher_et
Definition: arp.c:97
void wc_arp_set_publisher_node(uword node_index, uword event_type)
Definition: arp.c:1630
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:454
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:760
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:1910
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:2007
enum fib_entry_flag_t_ fib_entry_flag_t
static u8 * format_ethernet_arp_opcode(u8 *s, va_list *va)
Definition: arp.c:143
void send_ip4_garp_w_addr(vlib_main_t *vm, const ip4_address_t *ip4_addr, u32 sw_if_index)
Definition: arp.c:2562
void fib_table_lock(u32 fib_index, fib_protocol_t proto, fib_source_t source)
Release a reference counting lock on the table.
Definition: fib_table.c:1257
#define VLIB_CLI_COMMAND(x,...)
Definition: cli.h:154
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:2509
vlib_packet_template_t ip4_arp_request_packet_template
Template used to generate IP4 ARP packets.
Definition: ip4.h:135
#define hash_create(elts, value_bytes)
Definition: hash.h:696
#define ETHERNET_ARP_ARGS_REMOVE
Definition: arp.c:109
u16 cached_next_index
Next frame index that vector arguments were last enqueued to last time this node ran.
Definition: node.h:492
#define VNET_SW_INTERFACE_FLAG_ADMIN_UP
Definition: interface.h:660
uword unformat_ethernet_address(unformat_input_t *input, va_list *args)
Definition: format.c:227
#define ASSERT(truth)
u32 arp_term_next_node_index[32]
Definition: arp.c:2292
#define vec_delete(V, N, M)
Delete N elements starting at element M.
Definition: vec.h:786
long ctx[MAX_CONNS]
Definition: main.c:126
The default route source.
Definition: fib_entry.h:133
IPv4 main type.
Definition: ip4.h:95
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:87
static void vlib_buffer_advance(vlib_buffer_t *b, word l)
Advance current data pointer by the supplied (signed!) amount.
Definition: buffer.h:215
size_t count
Definition: vapi.c:42
#define clib_mem_unaligned(pointer, type)
Definition: types.h:155
format_function_t format_ip6_header
Definition: format.h:103
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:319
Definition: pg.h:96
ethernet_arp_ip4_over_ethernet_address_t a
Definition: arp.c:105
void ethernet_register_input_type(vlib_main_t *vm, ethernet_type_t type, u32 node_index)
Definition: node.c:1333
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:2492
uword * arp_entries
Hash table of ARP entries.
Definition: arp.c:50
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:55
#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:132
f64 time_last_updated
Definition: arp_packet.h:159
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:45
ip4_address_t hi_addr
Definition: arp.c:56
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:1332
#define FIB_NODE_INDEX_INVALID
Definition: fib_types.h:31
int vnet_proxy_arp_fib_reset(u32 fib_id)
Definition: arp.c:2048
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:190
#define hash_foreach_pair(p, v, body)
Iterate over hash pairs.
Definition: hash.h:373
Definition: fib_entry.h:271
u64 uword
Definition: types.h:112
format_function_t format_vlib_time
Definition: node_funcs.h:1163
#define vec_sort_with_function(vec, f)
Sort a vector using the supplied element comparison function.
Definition: vec.h:961
#define ETHERNET_ARP_ARGS_WC_PUB
Definition: arp.c:112
static u8 * format_arp_term_input_trace(u8 *s, va_list *va)
Definition: arp.c:302
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:1826
vnet_sw_interface_t * sw_interfaces
Definition: interface.h:801
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:125
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:79
l2_bridge_domain_t * bd_configs
Definition: l2_input.h:69
static void arp_entry_free(ethernet_arp_interface_t *eai, ethernet_arp_ip4_entry_t *e)
Definition: arp.c:1789
pg_edit_t opcode
Definition: arp.c:1457
ethernet_arp_input_error_t
Definition: arp.c:880
arp_term_next_t
Definition: arp.c:2285
static void vnet_arp_wc_publish_internal(vnet_main_t *vnm, vnet_arp_set_ip4_over_ethernet_rpc_args_t *args)
Definition: arp.c:1611
struct clib_bihash_value offset
template key/value backing page structure
u32 limit_arp_cache_size
Definition: arp.c:88
ip4_address_t lo_addr
Definition: arp.c:55
#define vnet_buffer(b)
Definition: buffer.h:360
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:832
uword node_index
Definition: arp.c:63
#define vec_foreach(var, vec)
Vector iterator.
static uword ip6_address_is_unspecified(ip6_address_t *a)
Definition: ip6_packet.h:283
uword * mac_by_ip4
Definition: l2_bd.h:85
u16 flags
Copy of main node flags.
Definition: node.h:486
static int arp_unnumbered(vlib_buffer_t *p0, u32 input_sw_if_index, u32 conn_sw_if_index)
Definition: arp.c:889
ethernet_arp_ip4_entry_t * ip4_neighbor_entries(u32 sw_if_index)
Definition: arp.c:1372
uword wc_ip4_arp_publisher_node
Definition: arp.c:96
vhost_vring_addr_t addr
Definition: vhost-user.h:83
int vnet_arp_set_ip4_over_ethernet(vnet_main_t *vnm, u32 sw_if_index, void *a_arg, int is_static, int is_no_fib_entry)
Definition: arp.c:1975
static int vnet_arp_populate_ip4_over_ethernet(vnet_main_t *vnm, u32 sw_if_index, void *a_arg)
Internally generated event to populate the ARP cache on an interface state change event...
Definition: arp.c:1576
#define VLIB_NODE_FLAG_TRACE
Definition: node.h:295
u32 flags
Definition: vhost-user.h:77
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:111
static uword unformat_ethernet_arp_opcode_net_byte_order(unformat_input_t *input, va_list *args)
Definition: arp.c:189
void adj_nbr_update_rewrite(adj_index_t adj_index, adj_nbr_rewrite_flag_t flags, u8 *rewrite)
adj_nbr_update_rewrite
Definition: adj_nbr.c:291
void ethernet_arp_change_mac(u32 sw_if_index)
Definition: arp.c:2533
void vlib_cli_output(vlib_main_t *vm, char *fmt,...)
Definition: cli.c:681
ethernet_arp_ip4_entry_t * ip4_entry_pool
Definition: arp.c:84
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:791
static vlib_buffer_t * vlib_get_buffer(vlib_main_t *vm, u32 buffer_index)
Translate buffer index into buffer pointer.
Definition: buffer_funcs.h:57
Definition: pg.h:310
const u8 * ethernet_ip4_mcast_dst_addr(void)
Definition: interface.c:55
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:42
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:169
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:437
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:212
static uword pool_elts(void *v)
Number of active elements in a pool.
Definition: pool.h:128