2 * ethernet/arp.c: IP v4 ARP node
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:
9 * http://www.apache.org/licenses/LICENSE-2.0
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.
18 #include <vnet/ip/ip.h>
19 #include <vnet/ip/ip6.h>
20 #include <vnet/ethernet/ethernet.h>
21 #include <vnet/ethernet/arp_packet.h>
22 #include <vnet/l2/l2_input.h>
23 #include <vppinfra/mhash.h>
24 #include <vnet/fib/ip4_fib.h>
25 #include <vnet/adj/adj_nbr.h>
26 #include <vnet/adj/adj_mcast.h>
27 #include <vnet/mpls/mpls.h>
33 * This file contains code to manage the IPv4 ARP tables (IP Address
34 * to MAC Address lookup).
38 void vl_api_rpc_call_main_thread (void *fp, u8 * data, u32 data_length);
41 * @brief Per-interface ARP configuration and state
43 typedef struct ethernet_arp_interface_t_
46 * Hash table of ARP entries.
47 * Since this hash table is per-interface, the key is only the IPv4 address.
50 } ethernet_arp_interface_t;
57 } ethernet_proxy_arp_t;
65 /* Used for arp event notification only */
68 } pending_resolution_t;
72 /* Hash tables mapping name to opcode. */
73 uword *opcode_by_name;
75 /* lite beer "glean" adjacency handling */
76 uword *pending_resolutions_by_address;
77 pending_resolution_t *pending_resolutions;
79 /* Mac address change notification */
80 uword *mac_changes_by_address;
81 pending_resolution_t *mac_changes;
83 ethernet_arp_ip4_entry_t *ip4_entry_pool;
85 /* ARP attack mitigation */
87 u32 limit_arp_cache_size;
89 /** Per interface state */
90 ethernet_arp_interface_t *ethernet_arp_by_sw_if_index;
92 /* Proxy arp vector */
93 ethernet_proxy_arp_t *proxy_arps;
94 } ethernet_arp_main_t;
96 static ethernet_arp_main_t ethernet_arp_main;
101 ethernet_arp_ip4_over_ethernet_address_t a;
105 #define ETHERNET_ARP_ARGS_REMOVE (1<<0)
106 #define ETHERNET_ARP_ARGS_FLUSH (1<<1)
107 #define ETHERNET_ARP_ARGS_POPULATE (1<<2)
108 } vnet_arp_set_ip4_over_ethernet_rpc_args_t;
111 set_ip4_over_ethernet_rpc_callback (vnet_arp_set_ip4_over_ethernet_rpc_args_t
115 format_ethernet_arp_hardware_type (u8 * s, va_list * va)
117 ethernet_arp_hardware_type_t h = va_arg (*va, ethernet_arp_hardware_type_t);
121 #define _(n,f) case n: t = #f; break;
122 foreach_ethernet_arp_hardware_type;
126 return format (s, "unknown 0x%x", h);
129 return format (s, "%s", t);
133 format_ethernet_arp_opcode (u8 * s, va_list * va)
135 ethernet_arp_opcode_t o = va_arg (*va, ethernet_arp_opcode_t);
139 #define _(f) case ETHERNET_ARP_OPCODE_##f: t = #f; break;
140 foreach_ethernet_arp_opcode;
144 return format (s, "unknown 0x%x", o);
147 return format (s, "%s", t);
151 unformat_ethernet_arp_opcode_host_byte_order (unformat_input_t * input,
154 int *result = va_arg (*args, int *);
155 ethernet_arp_main_t *am = ðernet_arp_main;
158 /* Numeric opcode. */
159 if (unformat (input, "0x%x", &x) || unformat (input, "%d", &x))
168 if (unformat_user (input, unformat_vlib_number_by_name,
169 am->opcode_by_name, &i))
179 unformat_ethernet_arp_opcode_net_byte_order (unformat_input_t * input,
182 int *result = va_arg (*args, int *);
184 (input, unformat_ethernet_arp_opcode_host_byte_order, result))
187 *result = clib_host_to_net_u16 ((u16) * result);
192 format_ethernet_arp_header (u8 * s, va_list * va)
194 ethernet_arp_header_t *a = va_arg (*va, ethernet_arp_header_t *);
195 u32 max_header_bytes = va_arg (*va, u32);
197 u16 l2_type, l3_type;
199 if (max_header_bytes != 0 && sizeof (a[0]) > max_header_bytes)
200 return format (s, "ARP header truncated");
202 l2_type = clib_net_to_host_u16 (a->l2_type);
203 l3_type = clib_net_to_host_u16 (a->l3_type);
205 indent = format_get_indent (s);
207 s = format (s, "%U, type %U/%U, address size %d/%d",
208 format_ethernet_arp_opcode, clib_net_to_host_u16 (a->opcode),
209 format_ethernet_arp_hardware_type, l2_type,
210 format_ethernet_type, l3_type,
211 a->n_l2_address_bytes, a->n_l3_address_bytes);
213 if (l2_type == ETHERNET_ARP_HARDWARE_TYPE_ethernet
214 && l3_type == ETHERNET_TYPE_IP4)
216 s = format (s, "\n%U%U/%U -> %U/%U",
217 format_white_space, indent,
218 format_ethernet_address, a->ip4_over_ethernet[0].ethernet,
219 format_ip4_address, &a->ip4_over_ethernet[0].ip4,
220 format_ethernet_address, a->ip4_over_ethernet[1].ethernet,
221 format_ip4_address, &a->ip4_over_ethernet[1].ip4);
225 uword n2 = a->n_l2_address_bytes;
226 uword n3 = a->n_l3_address_bytes;
227 s = format (s, "\n%U%U/%U -> %U/%U",
228 format_white_space, indent,
229 format_hex_bytes, a->data + 0 * n2 + 0 * n3, n2,
230 format_hex_bytes, a->data + 1 * n2 + 0 * n3, n3,
231 format_hex_bytes, a->data + 1 * n2 + 1 * n3, n2,
232 format_hex_bytes, a->data + 2 * n2 + 1 * n3, n3);
239 format_ethernet_arp_ip4_entry (u8 * s, va_list * va)
241 vnet_main_t *vnm = va_arg (*va, vnet_main_t *);
242 ethernet_arp_ip4_entry_t *e = va_arg (*va, ethernet_arp_ip4_entry_t *);
243 vnet_sw_interface_t *si;
247 return format (s, "%=12s%=16s%=6s%=20s%=24s", "Time", "IP4",
248 "Flags", "Ethernet", "Interface");
250 si = vnet_get_sw_interface (vnm, e->sw_if_index);
252 if (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC)
253 flags = format (flags, "S");
255 if (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_DYNAMIC)
256 flags = format (flags, "D");
258 if (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_NO_FIB_ENTRY)
259 flags = format (flags, "N");
261 s = format (s, "%=12U%=16U%=6s%=20U%=24U",
262 format_vlib_cpu_time, vnm->vlib_main, e->cpu_time_last_updated,
263 format_ip4_address, &e->ip4_address,
264 flags ? (char *) flags : "",
265 format_ethernet_address, e->ethernet_address,
266 format_vnet_sw_interface_name, vnm, si);
275 } ethernet_arp_input_trace_t;
278 format_ethernet_arp_input_trace (u8 * s, va_list * va)
280 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
281 CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
282 ethernet_arp_input_trace_t *t = va_arg (*va, ethernet_arp_input_trace_t *);
285 format_ethernet_arp_header,
286 t->packet_data, sizeof (t->packet_data));
292 format_arp_term_input_trace (u8 * s, va_list * va)
294 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
295 CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
296 ethernet_arp_input_trace_t *t = va_arg (*va, ethernet_arp_input_trace_t *);
298 /* arp-term trace data saved is either arp or ip6/icmp6 packet:
299 - for arp, the 1st 16-bit field is hw type of value of 0x0001.
300 - for ip6, the first nibble has value of 6. */
301 s = format (s, "%U", t->packet_data[0] == 0 ?
302 format_ethernet_arp_header : format_ip6_header,
303 t->packet_data, sizeof (t->packet_data));
309 arp_nbr_probe (ip_adjacency_t * adj)
311 vnet_main_t *vnm = vnet_get_main ();
312 ip4_main_t *im = &ip4_main;
313 ip_interface_address_t *ia;
314 ethernet_arp_header_t *h;
315 vnet_hw_interface_t *hi;
316 vnet_sw_interface_t *si;
322 vm = vlib_get_main ();
324 si = vnet_get_sw_interface (vnm, adj->rewrite_header.sw_if_index);
326 if (!(si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
332 ip4_interface_address_matching_destination (im,
333 &adj->sub_type.nbr.next_hop.
343 vlib_packet_template_get_packet (vm, &im->ip4_arp_request_packet_template,
346 hi = vnet_get_sup_hw_interface (vnm, adj->rewrite_header.sw_if_index);
348 clib_memcpy (h->ip4_over_ethernet[0].ethernet,
349 hi->hw_address, sizeof (h->ip4_over_ethernet[0].ethernet));
351 h->ip4_over_ethernet[0].ip4 = src[0];
352 h->ip4_over_ethernet[1].ip4 = adj->sub_type.nbr.next_hop.ip4;
354 b = vlib_get_buffer (vm, bi);
355 vnet_buffer (b)->sw_if_index[VLIB_RX] =
356 vnet_buffer (b)->sw_if_index[VLIB_TX] = adj->rewrite_header.sw_if_index;
358 /* Add encapsulation string for software interface (e.g. ethernet header). */
359 vnet_rewrite_one_header (adj[0], h, sizeof (ethernet_header_t));
360 vlib_buffer_advance (b, -adj->rewrite_header.data_bytes);
363 vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index);
364 u32 *to_next = vlib_frame_vector_args (f);
367 vlib_put_frame_to_node (vm, hi->output_node_index, f);
372 arp_mk_complete (adj_index_t ai, ethernet_arp_ip4_entry_t * e)
374 adj_nbr_update_rewrite
375 (ai, ADJ_NBR_REWRITE_FLAG_COMPLETE,
376 ethernet_build_rewrite (vnet_get_main (),
378 adj_get_link_type (ai), e->ethernet_address));
382 arp_mk_incomplete (adj_index_t ai)
384 ip_adjacency_t *adj = adj_get (ai);
386 adj_nbr_update_rewrite
388 ADJ_NBR_REWRITE_FLAG_INCOMPLETE,
389 ethernet_build_rewrite (vnet_get_main (),
390 adj->rewrite_header.sw_if_index,
392 VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST));
395 static ethernet_arp_ip4_entry_t *
396 arp_entry_find (ethernet_arp_interface_t * eai, const ip4_address_t * addr)
398 ethernet_arp_main_t *am = ðernet_arp_main;
399 ethernet_arp_ip4_entry_t *e = NULL;
402 if (NULL != eai->arp_entries)
404 p = hash_get (eai->arp_entries, addr->as_u32);
408 e = pool_elt_at_index (am->ip4_entry_pool, p[0]);
415 arp_mk_complete_walk (adj_index_t ai, void *ctx)
417 ethernet_arp_ip4_entry_t *e = ctx;
419 arp_mk_complete (ai, e);
421 return (ADJ_WALK_RC_CONTINUE);
425 arp_mk_incomplete_walk (adj_index_t ai, void *ctx)
427 arp_mk_incomplete (ai);
429 return (ADJ_WALK_RC_CONTINUE);
433 arp_update_adjacency (vnet_main_t * vnm, u32 sw_if_index, u32 ai)
435 ethernet_arp_main_t *am = ðernet_arp_main;
436 ethernet_arp_interface_t *arp_int;
437 ethernet_arp_ip4_entry_t *e;
442 vec_validate (am->ethernet_arp_by_sw_if_index, sw_if_index);
443 arp_int = &am->ethernet_arp_by_sw_if_index[sw_if_index];
444 e = arp_entry_find (arp_int, &adj->sub_type.nbr.next_hop.ip4);
446 switch (adj->lookup_next_index)
448 case IP_LOOKUP_NEXT_ARP:
449 case IP_LOOKUP_NEXT_GLEAN:
452 adj_nbr_walk_nh4 (sw_if_index,
453 &e->ip4_address, arp_mk_complete_walk, e);
458 * no matching ARP entry.
459 * construct the rewrite required to for an ARP packet, and stick
460 * that in the adj's pipe to smoke.
462 adj_nbr_update_rewrite
464 ADJ_NBR_REWRITE_FLAG_INCOMPLETE,
465 ethernet_build_rewrite
469 VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST));
472 * since the FIB has added this adj for a route, it makes sense it
473 * may want to forward traffic sometime soon. Let's send a
474 * speculative ARP. just one. If we were to do periodically that
475 * wouldn't be bad either, but that's more code than i'm prepared to
476 * write at this time for relatively little reward.
481 case IP_LOOKUP_NEXT_MCAST:
484 * Construct a partial rewrite from the known ethernet mcast dest MAC
489 rewrite = ethernet_build_rewrite (vnm,
492 ethernet_ip4_mcast_dst_addr ());
493 offset = vec_len (rewrite) - 2;
496 * Complete the remaining fields of the adj's rewrite to direct the
497 * complete of the rewrite at switch time by copying in the IP
498 * dst address's bytes.
499 * Ofset is 2 bytes into the MAC desintation address. And we copy 23 bits
502 adj_mcast_update_rewrite (ai, rewrite, offset, 0x007fffff);
506 case IP_LOOKUP_NEXT_DROP:
507 case IP_LOOKUP_NEXT_PUNT:
508 case IP_LOOKUP_NEXT_LOCAL:
509 case IP_LOOKUP_NEXT_REWRITE:
510 case IP_LOOKUP_NEXT_MCAST_MIDCHAIN:
511 case IP_LOOKUP_NEXT_MIDCHAIN:
512 case IP_LOOKUP_NEXT_ICMP_ERROR:
513 case IP_LOOKUP_N_NEXT:
520 vnet_arp_set_ip4_over_ethernet_internal (vnet_main_t * vnm,
521 vnet_arp_set_ip4_over_ethernet_rpc_args_t
524 ethernet_arp_ip4_entry_t *e = 0;
525 ethernet_arp_main_t *am = ðernet_arp_main;
526 ethernet_arp_ip4_over_ethernet_address_t *a = &args->a;
527 vlib_main_t *vm = vlib_get_main ();
528 int make_new_arp_cache_entry = 1;
530 pending_resolution_t *pr, *mc;
531 ethernet_arp_interface_t *arp_int;
532 int is_static = args->is_static;
533 u32 sw_if_index = args->sw_if_index;
534 int is_no_fib_entry = args->is_no_fib_entry;
536 vec_validate (am->ethernet_arp_by_sw_if_index, sw_if_index);
538 arp_int = &am->ethernet_arp_by_sw_if_index[sw_if_index];
540 if (NULL != arp_int->arp_entries)
542 p = hash_get (arp_int->arp_entries, a->ip4.as_u32);
545 e = pool_elt_at_index (am->ip4_entry_pool, p[0]);
547 /* Refuse to over-write static arp. */
548 if (!is_static && (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC))
550 make_new_arp_cache_entry = 0;
554 if (make_new_arp_cache_entry)
556 pool_get (am->ip4_entry_pool, e);
558 if (NULL == arp_int->arp_entries)
560 arp_int->arp_entries = hash_create (0, sizeof (u32));
563 hash_set (arp_int->arp_entries, a->ip4.as_u32, e - am->ip4_entry_pool);
565 e->sw_if_index = sw_if_index;
566 e->ip4_address = a->ip4;
567 e->fib_entry_index = FIB_NODE_INDEX_INVALID;
568 clib_memcpy (e->ethernet_address,
569 a->ethernet, sizeof (e->ethernet_address));
571 if (!is_no_fib_entry)
575 .fp_proto = FIB_PROTOCOL_IP4,
576 .fp_addr.ip4 = a->ip4,
581 ip4_fib_table_get_index_for_sw_if_index (e->sw_if_index);
583 fib_table_entry_update_one_path (fib_index, &pfx, FIB_SOURCE_ADJ,
584 FIB_ENTRY_FLAG_ATTACHED,
585 FIB_PROTOCOL_IP4, &pfx.fp_addr,
586 e->sw_if_index, ~0, 1, NULL,
587 FIB_ROUTE_PATH_FLAG_NONE);
591 e->flags |= ETHERNET_ARP_IP4_ENTRY_FLAG_NO_FIB_ENTRY;
597 * prevent a DoS attack from the data-plane that
598 * spams us with no-op updates to the MAC address
600 if (0 == memcmp (e->ethernet_address,
601 a->ethernet, sizeof (e->ethernet_address)))
604 /* Update time stamp and ethernet address. */
605 clib_memcpy (e->ethernet_address, a->ethernet,
606 sizeof (e->ethernet_address));
609 e->cpu_time_last_updated = clib_cpu_time_now ();
611 e->flags |= ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC;
613 e->flags |= ETHERNET_ARP_IP4_ENTRY_FLAG_DYNAMIC;
615 adj_nbr_walk_nh4 (sw_if_index, &e->ip4_address, arp_mk_complete_walk, e);
617 /* Customer(s) waiting for this address to be resolved? */
618 p = hash_get (am->pending_resolutions_by_address, a->ip4.as_u32);
624 while (next_index != (u32) ~ 0)
626 pr = pool_elt_at_index (am->pending_resolutions, next_index);
627 vlib_process_signal_event (vm, pr->node_index,
628 pr->type_opaque, pr->data);
629 next_index = pr->next_index;
630 pool_put (am->pending_resolutions, pr);
633 hash_unset (am->pending_resolutions_by_address, a->ip4.as_u32);
636 /* Customer(s) requesting ARP event for this address? */
637 p = hash_get (am->mac_changes_by_address, a->ip4.as_u32);
643 while (next_index != (u32) ~ 0)
645 int (*fp) (u32, u8 *, u32, u32);
647 mc = pool_elt_at_index (am->mac_changes, next_index);
648 fp = mc->data_callback;
650 /* Call the user's data callback, return 1 to suppress dup events */
652 rv = (*fp) (mc->data, a->ethernet, sw_if_index, 0);
655 * Signal the resolver process, as long as the user
656 * says they want to be notified
659 vlib_process_signal_event (vm, mc->node_index,
660 mc->type_opaque, mc->data);
661 next_index = mc->next_index;
669 vnet_register_ip4_arp_resolution_event (vnet_main_t * vnm,
672 uword type_opaque, uword data)
674 ethernet_arp_main_t *am = ðernet_arp_main;
675 ip4_address_t *address = address_arg;
677 pending_resolution_t *pr;
679 pool_get (am->pending_resolutions, pr);
682 pr->node_index = node_index;
683 pr->type_opaque = type_opaque;
685 pr->data_callback = 0;
687 p = hash_get (am->pending_resolutions_by_address, address->as_u32);
690 /* Insert new resolution at the head of the list */
691 pr->next_index = p[0];
692 hash_unset (am->pending_resolutions_by_address, address->as_u32);
695 hash_set (am->pending_resolutions_by_address, address->as_u32,
696 pr - am->pending_resolutions);
700 vnet_add_del_ip4_arp_change_event (vnet_main_t * vnm,
705 uword type_opaque, uword data, int is_add)
707 ethernet_arp_main_t *am = ðernet_arp_main;
708 ip4_address_t *address = address_arg;
710 /* Try to find an existing entry */
711 u32 *first = (u32 *) hash_get (am->mac_changes_by_address, address->as_u32);
713 pending_resolution_t *mc;
714 while (p && *p != ~0)
716 mc = pool_elt_at_index (am->mac_changes, *p);
717 if (mc->node_index == node_index && mc->type_opaque == type_opaque
723 int found = p && *p != ~0;
727 return VNET_API_ERROR_ENTRY_ALREADY_EXISTS;
729 pool_get (am->mac_changes, mc);
730 *mc = (pending_resolution_t)
732 .next_index = ~0,.node_index = node_index,.type_opaque =
733 type_opaque,.data = data,.data_callback = data_callback,.pid =
736 /* Insert new resolution at the end of the list */
737 u32 new_idx = mc - am->mac_changes;
741 hash_set (am->mac_changes_by_address, address->as_u32, new_idx);
746 return VNET_API_ERROR_NO_SUCH_ENTRY;
748 /* Clients may need to clean up pool entries, too */
749 void (*fp) (u32, u8 *) = data_callback;
751 (*fp) (mc->data, 0 /* no new mac addrs */ );
753 /* Remove the entry from the list and delete the entry */
755 pool_put (am->mac_changes, mc);
757 /* Remove from hash if we deleted the last entry */
758 if (*p == ~0 && p == first)
759 hash_unset (am->mac_changes_by_address, address->as_u32);
764 /* Either we drop the packet or we send a reply to the sender. */
768 ARP_INPUT_NEXT_REPLY_TX,
772 #define foreach_ethernet_arp_error \
773 _ (replies_sent, "ARP replies sent") \
774 _ (l2_type_not_ethernet, "L2 type not ethernet") \
775 _ (l3_type_not_ip4, "L3 type not IP4") \
776 _ (l3_src_address_not_local, "IP4 source address not local to subnet") \
777 _ (l3_dst_address_not_local, "IP4 destination address not local to subnet") \
778 _ (l3_src_address_is_local, "IP4 source address matches local interface") \
779 _ (l3_src_address_learned, "ARP request IP4 source address learned") \
780 _ (replies_received, "ARP replies received") \
781 _ (opcode_not_request, "ARP opcode not request") \
782 _ (proxy_arp_replies_sent, "Proxy ARP replies sent") \
783 _ (l2_address_mismatch, "ARP hw addr does not match L2 frame src addr") \
784 _ (missing_interface_address, "ARP missing interface address") \
785 _ (gratuitous_arp, "ARP probe or announcement dropped") \
786 _ (interface_no_table, "Interface is not mapped to an IP table") \
787 _ (interface_not_ip_enabled, "Interface is not IP enabled") \
791 #define _(sym,string) ETHERNET_ARP_ERROR_##sym,
792 foreach_ethernet_arp_error
794 ETHERNET_ARP_N_ERROR,
795 } ethernet_arp_input_error_t;
799 unset_random_arp_entry (void)
801 ethernet_arp_main_t *am = ðernet_arp_main;
802 ethernet_arp_ip4_entry_t *e;
803 vnet_main_t *vnm = vnet_get_main ();
804 ethernet_arp_ip4_over_ethernet_address_t delme;
807 index = pool_next_index (am->ip4_entry_pool, am->arp_delete_rotor);
808 am->arp_delete_rotor = index;
810 /* Try again from elt 0, could happen if an intfc goes down */
813 index = pool_next_index (am->ip4_entry_pool, am->arp_delete_rotor);
814 am->arp_delete_rotor = index;
817 /* Nothing left in the pool */
821 e = pool_elt_at_index (am->ip4_entry_pool, index);
823 clib_memcpy (&delme.ethernet, e->ethernet_address, 6);
824 delme.ip4.as_u32 = e->ip4_address.as_u32;
826 vnet_arp_unset_ip4_over_ethernet (vnm, e->sw_if_index, &delme);
830 arp_unnumbered (vlib_buffer_t * p0,
832 ethernet_header_t * eth0,
833 u32 input_sw_if_index, u32 conn_sw_if_index)
835 vlib_main_t *vm = vlib_get_main ();
836 vnet_main_t *vnm = vnet_get_main ();
837 vnet_interface_main_t *vim = &vnm->interface_main;
838 vnet_sw_interface_t *si;
839 vnet_hw_interface_t *hi;
843 u8 dst_mac_address[6];
845 ethernet_arp_header_t *arp0;
847 /* verify that the input interface is unnumbered to the connected.
848 * the connected interface is the interface on which the subnet is
850 si = &vim->sw_interfaces[input_sw_if_index];
852 if (!(si->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED &&
853 (si->unnumbered_sw_if_index == conn_sw_if_index)))
855 /* the input interface is not unnumbered to the interface on which
856 * the sub-net is configured that covers the ARP request.
857 * So this is not the case for unnumbered.. */
861 /* Save the dst mac address */
862 clib_memcpy (dst_mac_address, eth0->dst_address, sizeof (dst_mac_address));
864 vec_insert (buffers, 1, 0);
867 for (i = 0; i < vec_len (buffers); i++)
869 b0 = vlib_get_buffer (vm, buffers[i]);
870 arp0 = vlib_buffer_get_current (b0);
872 hi = vnet_get_sup_hw_interface (vnm, input_sw_if_index);
873 si = vnet_get_sw_interface (vnm, input_sw_if_index);
875 /* For decoration, most likely */
876 vnet_buffer (b0)->sw_if_index[VLIB_TX] = hi->sw_if_index;
878 /* Fix ARP pkt src address */
879 clib_memcpy (arp0->ip4_over_ethernet[0].ethernet, hi->hw_address, 6);
881 /* Build L2 encaps for this swif */
882 header_size = sizeof (ethernet_header_t);
883 if (si->sub.eth.flags.one_tag)
885 else if (si->sub.eth.flags.two_tags)
888 vlib_buffer_advance (b0, -header_size);
889 eth0 = vlib_buffer_get_current (b0);
891 if (si->sub.eth.flags.one_tag)
893 ethernet_vlan_header_t *outer = (void *) (eth0 + 1);
895 eth0->type = si->sub.eth.flags.dot1ad ?
896 clib_host_to_net_u16 (ETHERNET_TYPE_DOT1AD) :
897 clib_host_to_net_u16 (ETHERNET_TYPE_VLAN);
898 outer->priority_cfi_and_id =
899 clib_host_to_net_u16 (si->sub.eth.outer_vlan_id);
900 outer->type = clib_host_to_net_u16 (ETHERNET_TYPE_ARP);
903 else if (si->sub.eth.flags.two_tags)
905 ethernet_vlan_header_t *outer = (void *) (eth0 + 1);
906 ethernet_vlan_header_t *inner = (void *) (outer + 1);
908 eth0->type = si->sub.eth.flags.dot1ad ?
909 clib_host_to_net_u16 (ETHERNET_TYPE_DOT1AD) :
910 clib_host_to_net_u16 (ETHERNET_TYPE_VLAN);
911 outer->priority_cfi_and_id =
912 clib_host_to_net_u16 (si->sub.eth.outer_vlan_id);
913 outer->type = clib_host_to_net_u16 (ETHERNET_TYPE_VLAN);
914 inner->priority_cfi_and_id =
915 clib_host_to_net_u16 (si->sub.eth.inner_vlan_id);
916 inner->type = clib_host_to_net_u16 (ETHERNET_TYPE_ARP);
921 eth0->type = clib_host_to_net_u16 (ETHERNET_TYPE_ARP);
924 /* Restore the original dst address, set src address */
925 clib_memcpy (eth0->dst_address, dst_mac_address,
926 sizeof (eth0->dst_address));
927 clib_memcpy (eth0->src_address, hi->hw_address,
928 sizeof (eth0->src_address));
930 /* Transmit replicas */
934 vlib_get_frame_to_node (vm, hi->output_node_index);
935 u32 *to_next = vlib_frame_vector_args (f);
936 to_next[0] = buffers[i];
938 vlib_put_frame_to_node (vm, hi->output_node_index, f);
942 /* The regular path outputs the original pkt.. */
943 vnet_buffer (p0)->sw_if_index[VLIB_TX] = input_sw_if_index;
951 arp_learn (vnet_main_t * vnm,
952 ethernet_arp_main_t * am, u32 sw_if_index, void *addr)
954 if (am->limit_arp_cache_size &&
955 pool_elts (am->ip4_entry_pool) >= am->limit_arp_cache_size)
956 unset_random_arp_entry ();
958 vnet_arp_set_ip4_over_ethernet (vnm, sw_if_index, addr, 0, 0);
959 return (ETHERNET_ARP_ERROR_l3_src_address_learned);
963 arp_input (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
965 ethernet_arp_main_t *am = ðernet_arp_main;
966 vnet_main_t *vnm = vnet_get_main ();
967 ip4_main_t *im4 = &ip4_main;
968 u32 n_left_from, next_index, *from, *to_next;
969 u32 n_replies_sent = 0, n_proxy_arp_replies_sent = 0;
971 from = vlib_frame_vector_args (frame);
972 n_left_from = frame->n_vectors;
973 next_index = node->cached_next_index;
975 if (node->flags & VLIB_NODE_FLAG_TRACE)
976 vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
978 sizeof (ethernet_arp_input_trace_t));
980 while (n_left_from > 0)
984 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
986 while (n_left_from > 0 && n_left_to_next > 0)
989 vnet_hw_interface_t *hw_if0;
990 ethernet_arp_header_t *arp0;
991 ethernet_header_t *eth0;
992 ip4_address_t *if_addr0, proxy_src;
993 u32 pi0, error0, next0, sw_if_index0, conn_sw_if_index0, fib_index0;
994 u8 is_request0, dst_is_local0, is_unnum0;
995 ethernet_proxy_arp_t *pa;
996 fib_node_index_t dst_fei, src_fei;
998 fib_entry_flag_t src_flags, dst_flags;
1005 n_left_to_next -= 1;
1008 p0 = vlib_get_buffer (vm, pi0);
1009 arp0 = vlib_buffer_get_current (p0);
1011 is_request0 = arp0->opcode
1012 == clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_request);
1014 error0 = ETHERNET_ARP_ERROR_replies_sent;
1018 clib_net_to_host_u16 (ETHERNET_ARP_HARDWARE_TYPE_ethernet) ?
1019 ETHERNET_ARP_ERROR_l2_type_not_ethernet : error0);
1022 clib_net_to_host_u16 (ETHERNET_TYPE_IP4) ?
1023 ETHERNET_ARP_ERROR_l3_type_not_ip4 : error0);
1025 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
1027 /* not playing the ARP game if the interface is not IPv4 enabled */
1029 (im4->ip_enabled_by_sw_if_index[sw_if_index0] == 0 ?
1030 ETHERNET_ARP_ERROR_interface_not_ip_enabled : error0);
1035 /* Check that IP address is local and matches incoming interface. */
1036 fib_index0 = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);
1037 if (~0 == fib_index0)
1039 error0 = ETHERNET_ARP_ERROR_interface_no_table;
1043 dst_fei = ip4_fib_table_lookup (ip4_fib_get (fib_index0),
1044 &arp0->ip4_over_ethernet[1].ip4,
1046 dst_flags = fib_entry_get_flags (dst_fei);
1048 src_fei = ip4_fib_table_lookup (ip4_fib_get (fib_index0),
1049 &arp0->ip4_over_ethernet[0].ip4,
1051 src_flags = fib_entry_get_flags (src_fei);
1053 conn_sw_if_index0 = fib_entry_get_resolving_interface (dst_fei);
1055 if (!(FIB_ENTRY_FLAG_CONNECTED & dst_flags))
1057 error0 = ETHERNET_ARP_ERROR_l3_dst_address_not_local;
1061 /* Honor unnumbered interface, if any */
1062 is_unnum0 = sw_if_index0 != conn_sw_if_index0;
1064 /* Source must also be local to subnet of matching interface address. */
1065 if (!((FIB_ENTRY_FLAG_ATTACHED & src_flags) ||
1066 (FIB_ENTRY_FLAG_CONNECTED & src_flags)))
1069 * The packet was sent from an address that is not connected nor attached
1070 * i.e. it is not from an address that is covered by a link's sub-net,
1071 * nor is it a already learned host resp.
1073 error0 = ETHERNET_ARP_ERROR_l3_src_address_not_local;
1076 if (sw_if_index0 != fib_entry_get_resolving_interface (src_fei))
1079 * The interface the ARP was received on is not the interface
1080 * on which the covering prefix is configured. Maybe this is a case
1086 /* Reject requests/replies with our local interface address. */
1087 if (FIB_ENTRY_FLAG_LOCAL & src_flags)
1089 error0 = ETHERNET_ARP_ERROR_l3_src_address_is_local;
1093 dst_is_local0 = (FIB_ENTRY_FLAG_LOCAL & dst_flags);
1094 fib_entry_get_prefix (dst_fei, &pfx0);
1095 if_addr0 = &pfx0.fp_addr.ip4;
1097 /* Fill in ethernet header. */
1098 eth0 = ethernet_buffer_get_header (p0);
1100 /* Trash ARP packets whose ARP-level source addresses do not
1101 match their L2-frame-level source addresses */
1102 if (memcmp (eth0->src_address, arp0->ip4_over_ethernet[0].ethernet,
1103 sizeof (eth0->src_address)))
1105 error0 = ETHERNET_ARP_ERROR_l2_address_mismatch;
1109 /* Learn or update sender's mapping only for replies to addresses
1110 * that are local to the subnet */
1112 clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply) &&
1115 error0 = arp_learn (vnm, am, sw_if_index0,
1116 &arp0->ip4_over_ethernet[0]);
1122 vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
1123 hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
1125 /* Send reply back through input interface */
1126 vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
1127 next0 = ARP_INPUT_NEXT_REPLY_TX;
1129 arp0->opcode = clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply);
1131 arp0->ip4_over_ethernet[1] = arp0->ip4_over_ethernet[0];
1133 clib_memcpy (arp0->ip4_over_ethernet[0].ethernet,
1134 hw_if0->hw_address, 6);
1135 clib_mem_unaligned (&arp0->ip4_over_ethernet[0].ip4.data_u32, u32) =
1138 /* Hardware must be ethernet-like. */
1139 ASSERT (vec_len (hw_if0->hw_address) == 6);
1141 clib_memcpy (eth0->dst_address, eth0->src_address, 6);
1142 clib_memcpy (eth0->src_address, hw_if0->hw_address, 6);
1144 /* Figure out how much to rewind current data from adjacency. */
1145 /* get the adj from the destination's covering connected */
1150 if (!arp_unnumbered (p0, pi0, eth0,
1151 sw_if_index0, conn_sw_if_index0))
1156 ip_adjacency_t *adj0 = NULL;
1159 if (FIB_ENTRY_FLAG_ATTACHED & src_flags)
1162 * If the source is attached use the adj from that source.
1164 ai = fib_entry_get_adj (src_fei);
1165 if (ADJ_INDEX_INVALID != ai)
1167 adj0 = adj_get (ai);
1173 * Get the glean adj from the cover. This is presumably interface
1174 * sourced, and therefre needs to be a glean adj.
1176 ai = fib_entry_get_adj_for_source
1177 (ip4_fib_table_lookup
1178 (ip4_fib_get (fib_index0),
1179 &arp0->ip4_over_ethernet[1].ip4, 31),
1180 FIB_SOURCE_INTERFACE);
1182 if (ADJ_INDEX_INVALID != ai)
1184 adj0 = adj_get (ai);
1186 if (adj0->lookup_next_index == IP_LOOKUP_NEXT_GLEAN)
1194 vlib_buffer_advance (p0,
1195 -adj0->rewrite_header.data_bytes);
1199 error0 = ETHERNET_ARP_ERROR_missing_interface_address;
1205 /* We are going to reply to this request, so learn the sender */
1206 error0 = arp_learn (vnm, am, sw_if_index0,
1207 &arp0->ip4_over_ethernet[1]);
1209 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1210 n_left_to_next, pi0, next0);
1212 n_replies_sent += 1;
1216 if (0 == arp0->ip4_over_ethernet[0].ip4.as_u32 ||
1217 (arp0->ip4_over_ethernet[0].ip4.as_u32 ==
1218 arp0->ip4_over_ethernet[1].ip4.as_u32))
1220 error0 = ETHERNET_ARP_ERROR_gratuitous_arp;
1223 /* See if proxy arp is configured for the address */
1226 vnet_sw_interface_t *si;
1227 u32 this_addr = clib_net_to_host_u32
1228 (arp0->ip4_over_ethernet[1].ip4.as_u32);
1231 si = vnet_get_sw_interface (vnm, sw_if_index0);
1233 if (!(si->flags & VNET_SW_INTERFACE_FLAG_PROXY_ARP))
1236 fib_index0 = vec_elt (im4->fib_index_by_sw_if_index,
1239 vec_foreach (pa, am->proxy_arps)
1241 u32 lo_addr = clib_net_to_host_u32 (pa->lo_addr);
1242 u32 hi_addr = clib_net_to_host_u32 (pa->hi_addr);
1244 /* an ARP request hit in the proxy-arp table? */
1245 if ((this_addr >= lo_addr && this_addr <= hi_addr) &&
1246 (fib_index0 == pa->fib_index))
1248 eth0 = ethernet_buffer_get_header (p0);
1250 arp0->ip4_over_ethernet[1].ip4.data_u32;
1253 * Rewind buffer, direct code above not to
1254 * think too hard about it.
1256 if_addr0 = &proxy_src;
1258 i32 ethernet_start =
1259 vnet_buffer (p0)->ethernet.start_of_ethernet_header;
1260 i32 rewind = p0->current_data - ethernet_start;
1261 vlib_buffer_advance (p0, -rewind);
1262 n_proxy_arp_replies_sent++;
1270 next0 = ARP_INPUT_NEXT_DROP;
1271 p0->error = node->errors[error0];
1273 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1274 n_left_to_next, pi0, next0);
1277 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1280 vlib_error_count (vm, node->node_index,
1281 ETHERNET_ARP_ERROR_replies_sent,
1282 n_replies_sent - n_proxy_arp_replies_sent);
1284 vlib_error_count (vm, node->node_index,
1285 ETHERNET_ARP_ERROR_proxy_arp_replies_sent,
1286 n_proxy_arp_replies_sent);
1287 return frame->n_vectors;
1290 static char *ethernet_arp_error_strings[] = {
1291 #define _(sym,string) string,
1292 foreach_ethernet_arp_error
1297 VLIB_REGISTER_NODE (arp_input_node, static) =
1299 .function = arp_input,
1300 .name = "arp-input",
1301 .vector_size = sizeof (u32),
1302 .n_errors = ETHERNET_ARP_N_ERROR,
1303 .error_strings = ethernet_arp_error_strings,
1304 .n_next_nodes = ARP_INPUT_N_NEXT,
1306 [ARP_INPUT_NEXT_DROP] = "error-drop",
1307 [ARP_INPUT_NEXT_REPLY_TX] = "interface-output",
1309 .format_buffer = format_ethernet_arp_header,
1310 .format_trace = format_ethernet_arp_input_trace,
1315 ip4_arp_entry_sort (void *a1, void *a2)
1317 ethernet_arp_ip4_entry_t *e1 = a1;
1318 ethernet_arp_ip4_entry_t *e2 = a2;
1321 vnet_main_t *vnm = vnet_get_main ();
1323 cmp = vnet_sw_interface_compare (vnm, e1->sw_if_index, e2->sw_if_index);
1325 cmp = ip4_address_compare (&e1->ip4_address, &e2->ip4_address);
1329 ethernet_arp_ip4_entry_t *
1330 ip4_neighbor_entries (u32 sw_if_index)
1332 ethernet_arp_main_t *am = ðernet_arp_main;
1333 ethernet_arp_ip4_entry_t *n, *ns = 0;
1336 pool_foreach (n, am->ip4_entry_pool, ({
1337 if (sw_if_index != ~0 && n->sw_if_index != sw_if_index)
1339 vec_add1 (ns, n[0]);
1344 vec_sort_with_function (ns, ip4_arp_entry_sort);
1348 static clib_error_t *
1349 show_ip4_arp (vlib_main_t * vm,
1350 unformat_input_t * input, vlib_cli_command_t * cmd)
1352 vnet_main_t *vnm = vnet_get_main ();
1353 ethernet_arp_main_t *am = ðernet_arp_main;
1354 ethernet_arp_ip4_entry_t *e, *es;
1355 ethernet_proxy_arp_t *pa;
1356 clib_error_t *error = 0;
1359 /* Filter entries by interface if given. */
1361 (void) unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index);
1363 es = ip4_neighbor_entries (sw_if_index);
1366 vlib_cli_output (vm, "%U", format_ethernet_arp_ip4_entry, vnm, 0);
1369 vlib_cli_output (vm, "%U", format_ethernet_arp_ip4_entry, vnm, e);
1374 if (vec_len (am->proxy_arps))
1376 vlib_cli_output (vm, "Proxy arps enabled for:");
1377 vec_foreach (pa, am->proxy_arps)
1379 vlib_cli_output (vm, "Fib_index %d %U - %U ",
1381 format_ip4_address, &pa->lo_addr,
1382 format_ip4_address, &pa->hi_addr);
1390 * Display all the IPv4 ARP entries.
1393 * Example of how to display the IPv4 ARP table:
1394 * @cliexstart{show ip arp}
1395 * Time FIB IP4 Flags Ethernet Interface
1396 * 346.3028 0 6.1.1.3 de:ad:be:ef:ba:be GigabitEthernet2/0/0
1397 * 3077.4271 0 6.1.1.4 S de:ad:be:ef:ff:ff GigabitEthernet2/0/0
1398 * 2998.6409 1 6.2.2.3 de:ad:be:ef:00:01 GigabitEthernet2/0/0
1399 * Proxy arps enabled for:
1400 * Fib_index 0 6.0.0.1 - 6.0.0.11
1404 VLIB_CLI_COMMAND (show_ip4_arp_command, static) = {
1405 .path = "show ip arp",
1406 .function = show_ip4_arp,
1407 .short_help = "show ip arp",
1413 pg_edit_t l2_type, l3_type;
1414 pg_edit_t n_l2_address_bytes, n_l3_address_bytes;
1420 } ip4_over_ethernet[2];
1421 } pg_ethernet_arp_header_t;
1424 pg_ethernet_arp_header_init (pg_ethernet_arp_header_t * p)
1426 /* Initialize fields that are not bit fields in the IP header. */
1427 #define _(f) pg_edit_init (&p->f, ethernet_arp_header_t, f);
1430 _(n_l2_address_bytes);
1431 _(n_l3_address_bytes);
1433 _(ip4_over_ethernet[0].ethernet);
1434 _(ip4_over_ethernet[0].ip4);
1435 _(ip4_over_ethernet[1].ethernet);
1436 _(ip4_over_ethernet[1].ip4);
1441 unformat_pg_arp_header (unformat_input_t * input, va_list * args)
1443 pg_stream_t *s = va_arg (*args, pg_stream_t *);
1444 pg_ethernet_arp_header_t *p;
1447 p = pg_create_edit_group (s, sizeof (p[0]), sizeof (ethernet_arp_header_t),
1449 pg_ethernet_arp_header_init (p);
1452 pg_edit_set_fixed (&p->l2_type, ETHERNET_ARP_HARDWARE_TYPE_ethernet);
1453 pg_edit_set_fixed (&p->l3_type, ETHERNET_TYPE_IP4);
1454 pg_edit_set_fixed (&p->n_l2_address_bytes, 6);
1455 pg_edit_set_fixed (&p->n_l3_address_bytes, 4);
1457 if (!unformat (input, "%U: %U/%U -> %U/%U",
1459 unformat_ethernet_arp_opcode_net_byte_order, &p->opcode,
1461 unformat_ethernet_address, &p->ip4_over_ethernet[0].ethernet,
1463 unformat_ip4_address, &p->ip4_over_ethernet[0].ip4,
1465 unformat_ethernet_address, &p->ip4_over_ethernet[1].ethernet,
1467 unformat_ip4_address, &p->ip4_over_ethernet[1].ip4))
1469 /* Free up any edits we may have added. */
1470 pg_free_edit_group (s);
1477 ip4_set_arp_limit (u32 arp_limit)
1479 ethernet_arp_main_t *am = ðernet_arp_main;
1481 am->limit_arp_cache_size = arp_limit;
1486 * @brief Control Plane hook to remove an ARP entry
1489 vnet_arp_unset_ip4_over_ethernet (vnet_main_t * vnm,
1490 u32 sw_if_index, void *a_arg)
1492 ethernet_arp_ip4_over_ethernet_address_t *a = a_arg;
1493 vnet_arp_set_ip4_over_ethernet_rpc_args_t args;
1495 args.sw_if_index = sw_if_index;
1496 args.flags = ETHERNET_ARP_ARGS_REMOVE;
1497 clib_memcpy (&args.a, a, sizeof (*a));
1499 vl_api_rpc_call_main_thread (set_ip4_over_ethernet_rpc_callback,
1500 (u8 *) & args, sizeof (args));
1505 * @brief Internally generated event to flush the ARP cache on an
1506 * interface state change event.
1507 * A flush will remove dynamic ARP entries, and for statics remove the MAC
1508 * address from the corresponding adjacencies.
1511 vnet_arp_flush_ip4_over_ethernet (vnet_main_t * vnm,
1512 u32 sw_if_index, void *a_arg)
1514 ethernet_arp_ip4_over_ethernet_address_t *a = a_arg;
1515 vnet_arp_set_ip4_over_ethernet_rpc_args_t args;
1517 args.sw_if_index = sw_if_index;
1518 args.flags = ETHERNET_ARP_ARGS_FLUSH;
1519 clib_memcpy (&args.a, a, sizeof (*a));
1521 vl_api_rpc_call_main_thread (set_ip4_over_ethernet_rpc_callback,
1522 (u8 *) & args, sizeof (args));
1527 * @brief Internally generated event to populate the ARP cache on an
1528 * interface state change event.
1529 * For static entries this will re-source the adjacencies.
1531 * @param sw_if_index The interface on which the ARP entires are acted
1534 vnet_arp_populate_ip4_over_ethernet (vnet_main_t * vnm,
1535 u32 sw_if_index, void *a_arg)
1537 ethernet_arp_ip4_over_ethernet_address_t *a = a_arg;
1538 vnet_arp_set_ip4_over_ethernet_rpc_args_t args;
1540 args.sw_if_index = sw_if_index;
1541 args.flags = ETHERNET_ARP_ARGS_POPULATE;
1542 clib_memcpy (&args.a, a, sizeof (*a));
1544 vl_api_rpc_call_main_thread (set_ip4_over_ethernet_rpc_callback,
1545 (u8 *) & args, sizeof (args));
1550 * arp_add_del_interface_address
1552 * callback when an interface address is added or deleted
1555 arp_add_del_interface_address (ip4_main_t * im,
1558 ip4_address_t * address,
1560 u32 if_address_index, u32 is_del)
1563 * Flush the ARP cache of all entries covered by the address
1564 * that is being removed.
1566 ethernet_arp_main_t *am = ðernet_arp_main;
1567 ethernet_arp_ip4_entry_t *e;
1569 if (vec_len (am->ethernet_arp_by_sw_if_index) <= sw_if_index)
1574 ethernet_arp_interface_t *eai;
1575 u32 i, *to_delete = 0;
1578 eai = &am->ethernet_arp_by_sw_if_index[sw_if_index];
1581 hash_foreach_pair (pair, eai->arp_entries,
1583 e = pool_elt_at_index(am->ip4_entry_pool,
1585 if (ip4_destination_matches_route (im, &e->ip4_address,
1586 address, address_length))
1588 vec_add1 (to_delete, e - am->ip4_entry_pool);
1593 for (i = 0; i < vec_len (to_delete); i++)
1595 ethernet_arp_ip4_over_ethernet_address_t delme;
1596 e = pool_elt_at_index (am->ip4_entry_pool, to_delete[i]);
1598 clib_memcpy (&delme.ethernet, e->ethernet_address, 6);
1599 delme.ip4.as_u32 = e->ip4_address.as_u32;
1601 vnet_arp_flush_ip4_over_ethernet (vnet_get_main (),
1602 e->sw_if_index, &delme);
1605 vec_free (to_delete);
1609 static clib_error_t *
1610 ethernet_arp_init (vlib_main_t * vm)
1612 ethernet_arp_main_t *am = ðernet_arp_main;
1613 ip4_main_t *im = &ip4_main;
1614 clib_error_t *error;
1617 if ((error = vlib_call_init_function (vm, ethernet_init)))
1620 ethernet_register_input_type (vm, ETHERNET_TYPE_ARP, arp_input_node.index);
1622 pn = pg_get_node (arp_input_node.index);
1623 pn->unformat_edit = unformat_pg_arp_header;
1625 am->opcode_by_name = hash_create_string (0, sizeof (uword));
1626 #define _(o) hash_set_mem (am->opcode_by_name, #o, ETHERNET_ARP_OPCODE_##o);
1627 foreach_ethernet_arp_opcode;
1630 /* $$$ configurable */
1631 am->limit_arp_cache_size = 50000;
1633 am->pending_resolutions_by_address = hash_create (0, sizeof (uword));
1634 am->mac_changes_by_address = hash_create (0, sizeof (uword));
1636 /* don't trace ARP error packets */
1638 vlib_node_runtime_t *rt =
1639 vlib_node_get_runtime (vm, arp_input_node.index);
1642 vnet_pcap_drop_trace_filter_add_del \
1643 (rt->errors[ETHERNET_ARP_ERROR_##a], \
1645 foreach_ethernet_arp_error
1649 ip4_add_del_interface_address_callback_t cb;
1650 cb.function = arp_add_del_interface_address;
1651 cb.function_opaque = 0;
1652 vec_add1 (im->add_del_interface_address_callbacks, cb);
1657 VLIB_INIT_FUNCTION (ethernet_arp_init);
1660 arp_entry_free (ethernet_arp_interface_t * eai, ethernet_arp_ip4_entry_t * e)
1662 ethernet_arp_main_t *am = ðernet_arp_main;
1664 if (FIB_NODE_INDEX_INVALID != e->fib_entry_index)
1665 fib_table_entry_delete_index (e->fib_entry_index, FIB_SOURCE_ADJ);
1666 hash_unset (eai->arp_entries, e->ip4_address.as_u32);
1667 pool_put (am->ip4_entry_pool, e);
1671 vnet_arp_unset_ip4_over_ethernet_internal (vnet_main_t * vnm,
1672 vnet_arp_set_ip4_over_ethernet_rpc_args_t
1675 ethernet_arp_main_t *am = ðernet_arp_main;
1676 ethernet_arp_ip4_entry_t *e;
1677 ethernet_arp_interface_t *eai;
1679 eai = &am->ethernet_arp_by_sw_if_index[args->sw_if_index];
1681 e = arp_entry_find (eai, &args->a.ip4);
1685 arp_entry_free (eai, e);
1687 adj_nbr_walk_nh4 (e->sw_if_index,
1688 &e->ip4_address, arp_mk_incomplete_walk, NULL);
1695 vnet_arp_flush_ip4_over_ethernet_internal (vnet_main_t * vnm,
1696 vnet_arp_set_ip4_over_ethernet_rpc_args_t
1699 ethernet_arp_main_t *am = ðernet_arp_main;
1700 ethernet_arp_ip4_entry_t *e;
1701 ethernet_arp_interface_t *eai;
1703 eai = &am->ethernet_arp_by_sw_if_index[args->sw_if_index];
1705 e = arp_entry_find (eai, &args->a.ip4);
1709 adj_nbr_walk_nh4 (e->sw_if_index,
1710 &e->ip4_address, arp_mk_incomplete_walk, e);
1713 * The difference between flush and unset, is that an unset
1714 * means delete for static and dynamic entries. A flush
1715 * means delete only for dynamic. Flushing is what the DP
1716 * does in response to interface events. unset is only done
1717 * by the control plane.
1719 if (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_DYNAMIC)
1721 arp_entry_free (eai, e);
1728 vnet_arp_populate_ip4_over_ethernet_internal (vnet_main_t * vnm,
1729 vnet_arp_set_ip4_over_ethernet_rpc_args_t
1732 ethernet_arp_main_t *am = ðernet_arp_main;
1733 ethernet_arp_ip4_entry_t *e;
1734 ethernet_arp_interface_t *eai;
1736 eai = &am->ethernet_arp_by_sw_if_index[args->sw_if_index];
1738 e = arp_entry_find (eai, &args->a.ip4);
1742 adj_nbr_walk_nh4 (e->sw_if_index,
1743 &e->ip4_address, arp_mk_complete_walk, e);
1749 set_ip4_over_ethernet_rpc_callback (vnet_arp_set_ip4_over_ethernet_rpc_args_t
1752 vnet_main_t *vm = vnet_get_main ();
1753 ASSERT (vlib_get_thread_index () == 0);
1755 if (a->flags & ETHERNET_ARP_ARGS_REMOVE)
1756 vnet_arp_unset_ip4_over_ethernet_internal (vm, a);
1757 else if (a->flags & ETHERNET_ARP_ARGS_FLUSH)
1758 vnet_arp_flush_ip4_over_ethernet_internal (vm, a);
1759 else if (a->flags & ETHERNET_ARP_ARGS_POPULATE)
1760 vnet_arp_populate_ip4_over_ethernet_internal (vm, a);
1762 vnet_arp_set_ip4_over_ethernet_internal (vm, a);
1766 * @brief Invoked when the interface's admin state changes
1768 static clib_error_t *
1769 ethernet_arp_sw_interface_up_down (vnet_main_t * vnm,
1770 u32 sw_if_index, u32 flags)
1772 ethernet_arp_main_t *am = ðernet_arp_main;
1773 ethernet_arp_ip4_entry_t *e;
1774 u32 i, *to_delete = 0;
1777 pool_foreach (e, am->ip4_entry_pool,
1779 if (e->sw_if_index == sw_if_index)
1780 vec_add1 (to_delete,
1781 e - am->ip4_entry_pool);
1785 for (i = 0; i < vec_len (to_delete); i++)
1787 ethernet_arp_ip4_over_ethernet_address_t delme;
1788 e = pool_elt_at_index (am->ip4_entry_pool, to_delete[i]);
1790 clib_memcpy (&delme.ethernet, e->ethernet_address, 6);
1791 delme.ip4.as_u32 = e->ip4_address.as_u32;
1793 if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
1795 vnet_arp_populate_ip4_over_ethernet (vnm, e->sw_if_index, &delme);
1799 vnet_arp_flush_ip4_over_ethernet (vnm, e->sw_if_index, &delme);
1803 vec_free (to_delete);
1808 VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (ethernet_arp_sw_interface_up_down);
1811 increment_ip4_and_mac_address (ethernet_arp_ip4_over_ethernet_address_t * a)
1816 for (i = 3; i >= 0; i--)
1818 old = a->ip4.as_u8[i];
1819 a->ip4.as_u8[i] += 1;
1820 if (old < a->ip4.as_u8[i])
1824 for (i = 5; i >= 0; i--)
1826 old = a->ethernet[i];
1827 a->ethernet[i] += 1;
1828 if (old < a->ethernet[i])
1834 vnet_arp_set_ip4_over_ethernet (vnet_main_t * vnm,
1835 u32 sw_if_index, void *a_arg,
1836 int is_static, int is_no_fib_entry)
1838 ethernet_arp_ip4_over_ethernet_address_t *a = a_arg;
1839 vnet_arp_set_ip4_over_ethernet_rpc_args_t args;
1841 args.sw_if_index = sw_if_index;
1842 args.is_static = is_static;
1843 args.is_no_fib_entry = is_no_fib_entry;
1845 clib_memcpy (&args.a, a, sizeof (*a));
1847 vl_api_rpc_call_main_thread (set_ip4_over_ethernet_rpc_callback,
1848 (u8 *) & args, sizeof (args));
1853 vnet_proxy_arp_add_del (ip4_address_t * lo_addr,
1854 ip4_address_t * hi_addr, u32 fib_index, int is_del)
1856 ethernet_arp_main_t *am = ðernet_arp_main;
1857 ethernet_proxy_arp_t *pa;
1858 u32 found_at_index = ~0;
1860 vec_foreach (pa, am->proxy_arps)
1862 if (pa->lo_addr == lo_addr->as_u32
1863 && pa->hi_addr == hi_addr->as_u32 && pa->fib_index == fib_index)
1865 found_at_index = pa - am->proxy_arps;
1870 if (found_at_index != ~0)
1872 /* Delete, otherwise it's already in the table */
1874 vec_delete (am->proxy_arps, 1, found_at_index);
1877 /* delete, no such entry */
1879 return VNET_API_ERROR_NO_SUCH_ENTRY;
1881 /* add, not in table */
1882 vec_add2 (am->proxy_arps, pa, 1);
1883 pa->lo_addr = lo_addr->as_u32;
1884 pa->hi_addr = hi_addr->as_u32;
1885 pa->fib_index = fib_index;
1890 * Remove any proxy arp entries asdociated with the
1894 vnet_proxy_arp_fib_reset (u32 fib_id)
1896 ethernet_arp_main_t *am = ðernet_arp_main;
1897 ethernet_proxy_arp_t *pa;
1898 u32 *entries_to_delete = 0;
1902 fib_index = fib_table_find (FIB_PROTOCOL_IP4, fib_id);
1903 if (~0 == fib_index)
1904 return VNET_API_ERROR_NO_SUCH_ENTRY;
1906 vec_foreach (pa, am->proxy_arps)
1908 if (pa->fib_index == fib_index)
1910 vec_add1 (entries_to_delete, pa - am->proxy_arps);
1914 for (i = 0; i < vec_len (entries_to_delete); i++)
1916 vec_delete (am->proxy_arps, 1, entries_to_delete[i]);
1919 vec_free (entries_to_delete);
1924 static clib_error_t *
1925 ip_arp_add_del_command_fn (vlib_main_t * vm,
1926 unformat_input_t * input, vlib_cli_command_t * cmd)
1928 vnet_main_t *vnm = vnet_get_main ();
1930 ethernet_arp_ip4_over_ethernet_address_t lo_addr, hi_addr, addr;
1937 int is_no_fib_entry = 0;
1940 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
1942 /* set ip arp TenGigE1/1/0/1 1.2.3.4 aa:bb:... or aabb.ccdd... */
1943 if (unformat (input, "%U %U %U",
1944 unformat_vnet_sw_interface, vnm, &sw_if_index,
1945 unformat_ip4_address, &addr.ip4,
1946 unformat_ethernet_address, &addr.ethernet))
1949 else if (unformat (input, "delete") || unformat (input, "del"))
1952 else if (unformat (input, "static"))
1955 else if (unformat (input, "no-fib-entry"))
1956 is_no_fib_entry = 1;
1958 else if (unformat (input, "count %d", &count))
1961 else if (unformat (input, "fib-id %d", &fib_id))
1963 fib_index = fib_table_find (FIB_PROTOCOL_IP4, fib_id);
1965 if (~0 == fib_index)
1966 return clib_error_return (0, "fib ID %d doesn't exist\n", fib_id);
1969 else if (unformat (input, "proxy %U - %U",
1970 unformat_ip4_address, &lo_addr.ip4,
1971 unformat_ip4_address, &hi_addr.ip4))
1979 (void) vnet_proxy_arp_add_del (&lo_addr.ip4, &hi_addr.ip4,
1988 for (i = 0; i < count; i++)
1992 uword event_type, *event_data = 0;
1994 /* Park the debug CLI until the arp entry is installed */
1995 vnet_register_ip4_arp_resolution_event
1996 (vnm, &addr.ip4, vlib_current_process (vm),
1997 1 /* type */ , 0 /* data */ );
1999 vnet_arp_set_ip4_over_ethernet
2000 (vnm, sw_if_index, &addr, is_static, is_no_fib_entry);
2002 vlib_process_wait_for_event (vm);
2003 event_type = vlib_process_get_events (vm, &event_data);
2004 vec_reset_length (event_data);
2005 if (event_type != 1)
2006 clib_warning ("event type %d unexpected", event_type);
2009 vnet_arp_unset_ip4_over_ethernet (vnm, sw_if_index, &addr);
2011 increment_ip4_and_mac_address (&addr);
2016 return clib_error_return (0, "unknown input `%U'",
2017 format_unformat_error, input);
2025 * Add or delete IPv4 ARP cache entries.
2027 * @note 'set ip arp' options (e.g. delete, static, 'fib-id <id>',
2028 * 'count <number>', 'interface ip4_addr mac_addr') can be added in
2029 * any order and combination.
2033 * Add or delete IPv4 ARP cache entries as follows. MAC Address can be in
2034 * either aa:bb:cc:dd:ee:ff format or aabb.ccdd.eeff format.
2035 * @cliexcmd{set ip arp GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2036 * @cliexcmd{set ip arp delete GigabitEthernet2/0/0 6.0.0.3 de:ad:be:ef:ba:be}
2038 * To add or delete an IPv4 ARP cache entry to or from a specific fib
2040 * @cliexcmd{set ip arp fib-id 1 GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2041 * @cliexcmd{set ip arp fib-id 1 delete GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2043 * Add or delete IPv4 static ARP cache entries as follows:
2044 * @cliexcmd{set ip arp static GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2045 * @cliexcmd{set ip arp static delete GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2047 * For testing / debugging purposes, the 'set ip arp' command can add or
2048 * delete multiple entries. Supply the 'count N' parameter:
2049 * @cliexcmd{set ip arp count 10 GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2052 VLIB_CLI_COMMAND (ip_arp_add_del_command, static) = {
2053 .path = "set ip arp",
2055 "set ip arp [del] <intfc> <ip-address> <mac-address> [static] [no-fib-entry] [count <count>] [fib-id <fib-id>] [proxy <lo-addr> - <hi-addr>]",
2056 .function = ip_arp_add_del_command_fn,
2060 static clib_error_t *
2061 set_int_proxy_arp_command_fn (vlib_main_t * vm,
2063 input, vlib_cli_command_t * cmd)
2065 vnet_main_t *vnm = vnet_get_main ();
2067 vnet_sw_interface_t *si;
2071 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2073 if (unformat (input, "%U", unformat_vnet_sw_interface,
2076 else if (unformat (input, "enable") || unformat (input, "on"))
2078 else if (unformat (input, "disable") || unformat (input, "off"))
2085 return clib_error_return (0, "unknown input '%U'",
2086 format_unformat_error, input);
2088 si = vnet_get_sw_interface (vnm, sw_if_index);
2091 si->flags |= VNET_SW_INTERFACE_FLAG_PROXY_ARP;
2093 si->flags &= ~VNET_SW_INTERFACE_FLAG_PROXY_ARP;
2100 * Enable proxy-arp on an interface. The vpp stack will answer ARP
2101 * requests for the indicated address range. Multiple proxy-arp
2102 * ranges may be provisioned.
2104 * @note Proxy ARP as a technology is infamous for blackholing traffic.
2105 * Also, the underlying implementation has not been performance-tuned.
2106 * Avoid creating an unnecessarily large set of ranges.
2109 * To enable proxy arp on a range of addresses, use:
2110 * @cliexcmd{set ip arp proxy 6.0.0.1 - 6.0.0.11}
2111 * Append 'del' to delete a range of proxy ARP addresses:
2112 * @cliexcmd{set ip arp proxy 6.0.0.1 - 6.0.0.11 del}
2113 * You must then specifically enable proxy arp on individual interfaces:
2114 * @cliexcmd{set interface proxy-arp GigabitEthernet0/8/0 enable}
2115 * To disable proxy arp on an individual interface:
2116 * @cliexcmd{set interface proxy-arp GigabitEthernet0/8/0 disable}
2118 VLIB_CLI_COMMAND (set_int_proxy_enable_command, static) = {
2119 .path = "set interface proxy-arp",
2121 "set interface proxy-arp <intfc> [enable|disable]",
2122 .function = set_int_proxy_arp_command_fn,
2128 * ARP/ND Termination in a L2 Bridge Domain based on IP4/IP6 to MAC
2129 * hash tables mac_by_ip4 and mac_by_ip6 for each BD.
2133 ARP_TERM_NEXT_L2_OUTPUT,
2138 u32 arp_term_next_node_index[32];
2141 arp_term_l2bd (vlib_main_t * vm,
2142 vlib_node_runtime_t * node, vlib_frame_t * frame)
2144 l2input_main_t *l2im = &l2input_main;
2145 u32 n_left_from, next_index, *from, *to_next;
2146 u32 n_replies_sent = 0;
2147 u16 last_bd_index = ~0;
2148 l2_bridge_domain_t *last_bd_config = 0;
2149 l2_input_config_t *cfg0;
2151 from = vlib_frame_vector_args (frame);
2152 n_left_from = frame->n_vectors;
2153 next_index = node->cached_next_index;
2155 while (n_left_from > 0)
2159 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2161 while (n_left_from > 0 && n_left_to_next > 0)
2164 ethernet_header_t *eth0;
2165 ethernet_arp_header_t *arp0;
2168 u32 pi0, error0, next0, sw_if_index0;
2179 n_left_to_next -= 1;
2181 p0 = vlib_get_buffer (vm, pi0);
2182 // Terminate only local (SHG == 0) ARP
2183 if (vnet_buffer (p0)->l2.shg != 0)
2184 goto next_l2_feature;
2186 eth0 = vlib_buffer_get_current (p0);
2187 l3h0 = (u8 *) eth0 + vnet_buffer (p0)->l2.l2_len;
2188 ethertype0 = clib_net_to_host_u16 (*(u16 *) (l3h0 - 2));
2189 arp0 = (ethernet_arp_header_t *) l3h0;
2191 if (PREDICT_FALSE ((ethertype0 != ETHERNET_TYPE_ARP) ||
2193 clib_host_to_net_u16
2194 (ETHERNET_ARP_OPCODE_request))))
2197 /* Must be ARP request packet here */
2198 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) &&
2199 (p0->flags & VLIB_BUFFER_IS_TRACED)))
2201 u8 *t0 = vlib_add_trace (vm, node, p0,
2202 sizeof (ethernet_arp_input_trace_t));
2203 clib_memcpy (t0, l3h0, sizeof (ethernet_arp_input_trace_t));
2206 error0 = ETHERNET_ARP_ERROR_replies_sent;
2209 clib_net_to_host_u16 (ETHERNET_ARP_HARDWARE_TYPE_ethernet)
2210 ? ETHERNET_ARP_ERROR_l2_type_not_ethernet : error0);
2213 clib_net_to_host_u16 (ETHERNET_TYPE_IP4) ?
2214 ETHERNET_ARP_ERROR_l3_type_not_ip4 : error0);
2216 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
2221 /* Trash ARP packets whose ARP-level source addresses do not
2222 match their L2-frame-level source addresses */
2225 (eth0->src_address, arp0->ip4_over_ethernet[0].ethernet,
2226 sizeof (eth0->src_address))))
2228 error0 = ETHERNET_ARP_ERROR_l2_address_mismatch;
2232 /* Check if anyone want ARP request events for L2 BDs */
2234 pending_resolution_t *mc;
2235 ethernet_arp_main_t *am = ðernet_arp_main;
2236 uword *p = hash_get (am->mac_changes_by_address, 0);
2239 u32 next_index = p[0];
2240 while (next_index != (u32) ~ 0)
2242 int (*fp) (u32, u8 *, u32, u32);
2244 mc = pool_elt_at_index (am->mac_changes, next_index);
2245 fp = mc->data_callback;
2246 /* Call the callback, return 1 to suppress dup events */
2248 rv = (*fp) (mc->data,
2249 arp0->ip4_over_ethernet[0].ethernet,
2251 arp0->ip4_over_ethernet[0].ip4.as_u32);
2252 /* Signal the resolver process */
2254 vlib_process_signal_event (vm, mc->node_index,
2255 mc->type_opaque, mc->data);
2256 next_index = mc->next_index;
2261 /* lookup BD mac_by_ip4 hash table for MAC entry */
2262 ip0 = arp0->ip4_over_ethernet[1].ip4.as_u32;
2263 bd_index0 = vnet_buffer (p0)->l2.bd_index;
2264 if (PREDICT_FALSE ((bd_index0 != last_bd_index)
2265 || (last_bd_index == (u16) ~ 0)))
2267 last_bd_index = bd_index0;
2268 last_bd_config = vec_elt_at_index (l2im->bd_configs, bd_index0);
2270 macp0 = (u8 *) hash_get (last_bd_config->mac_by_ip4, ip0);
2272 if (PREDICT_FALSE (!macp0))
2273 goto next_l2_feature; /* MAC not found */
2275 /* MAC found, send ARP reply -
2276 Convert ARP request packet to ARP reply */
2277 arp0->opcode = clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply);
2278 arp0->ip4_over_ethernet[1] = arp0->ip4_over_ethernet[0];
2279 arp0->ip4_over_ethernet[0].ip4.as_u32 = ip0;
2280 clib_memcpy (arp0->ip4_over_ethernet[0].ethernet, macp0, 6);
2281 clib_memcpy (eth0->dst_address, eth0->src_address, 6);
2282 clib_memcpy (eth0->src_address, macp0, 6);
2283 n_replies_sent += 1;
2286 /* For BVI, need to use l2-fwd node to send ARP reply as
2287 l2-output node cannot output packet to BVI properly */
2288 cfg0 = vec_elt_at_index (l2im->configs, sw_if_index0);
2289 if (PREDICT_FALSE (cfg0->bvi))
2291 vnet_buffer (p0)->l2.feature_bitmap |= L2INPUT_FEAT_FWD;
2292 vnet_buffer (p0)->sw_if_index[VLIB_RX] = 0;
2293 goto next_l2_feature;
2296 /* Send ARP/ND reply back out input interface through l2-output */
2297 vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
2298 next0 = ARP_TERM_NEXT_L2_OUTPUT;
2299 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2300 to_next, n_left_to_next, pi0,
2305 /* IP6 ND event notification or solicitation handling to generate
2306 local response instead of flooding */
2307 iph0 = (ip6_header_t *) l3h0;
2308 if (PREDICT_FALSE (ethertype0 == ETHERNET_TYPE_IP6 &&
2309 iph0->protocol == IP_PROTOCOL_ICMP6 &&
2310 !ip6_address_is_unspecified
2311 (&iph0->src_address)))
2313 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
2314 if (vnet_ip6_nd_term
2315 (vm, node, p0, eth0, iph0, sw_if_index0,
2316 vnet_buffer (p0)->l2.bd_index))
2317 goto output_response;
2322 u32 feature_bitmap0 =
2323 vnet_buffer (p0)->l2.feature_bitmap & ~L2INPUT_FEAT_ARP_TERM;
2324 vnet_buffer (p0)->l2.feature_bitmap = feature_bitmap0;
2326 feat_bitmap_get_next_node_index (arp_term_next_node_index,
2328 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2329 to_next, n_left_to_next,
2335 if (0 == arp0->ip4_over_ethernet[0].ip4.as_u32 ||
2336 (arp0->ip4_over_ethernet[0].ip4.as_u32 ==
2337 arp0->ip4_over_ethernet[1].ip4.as_u32))
2339 error0 = ETHERNET_ARP_ERROR_gratuitous_arp;
2341 next0 = ARP_TERM_NEXT_DROP;
2342 p0->error = node->errors[error0];
2344 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2345 to_next, n_left_to_next, pi0,
2349 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2352 vlib_error_count (vm, node->node_index,
2353 ETHERNET_ARP_ERROR_replies_sent, n_replies_sent);
2354 return frame->n_vectors;
2358 VLIB_REGISTER_NODE (arp_term_l2bd_node, static) = {
2359 .function = arp_term_l2bd,
2360 .name = "arp-term-l2bd",
2361 .vector_size = sizeof (u32),
2362 .n_errors = ETHERNET_ARP_N_ERROR,
2363 .error_strings = ethernet_arp_error_strings,
2364 .n_next_nodes = ARP_TERM_N_NEXT,
2366 [ARP_TERM_NEXT_L2_OUTPUT] = "l2-output",
2367 [ARP_TERM_NEXT_DROP] = "error-drop",
2369 .format_buffer = format_ethernet_arp_header,
2370 .format_trace = format_arp_term_input_trace,
2375 arp_term_init (vlib_main_t * vm)
2377 // Initialize the feature next-node indexes
2378 feat_bitmap_init_next_nodes (vm,
2379 arp_term_l2bd_node.index,
2381 l2input_get_feat_names (),
2382 arp_term_next_node_index);
2386 VLIB_INIT_FUNCTION (arp_term_init);
2389 change_arp_mac (u32 sw_if_index, ethernet_arp_ip4_entry_t * e)
2391 if (e->sw_if_index == sw_if_index)
2393 adj_nbr_walk_nh4 (e->sw_if_index,
2394 &e->ip4_address, arp_mk_complete_walk, e);
2399 ethernet_arp_change_mac (u32 sw_if_index)
2401 ethernet_arp_main_t *am = ðernet_arp_main;
2402 ethernet_arp_ip4_entry_t *e;
2405 pool_foreach (e, am->ip4_entry_pool,
2407 change_arp_mac (sw_if_index, e);
2413 * fd.io coding-style-patch-verification: ON
2416 * eval: (c-set-style "gnu")