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;
110 static const u8 vrrp_prefix[] = { 0x00, 0x00, 0x5E, 0x00, 0x01 };
113 set_ip4_over_ethernet_rpc_callback (vnet_arp_set_ip4_over_ethernet_rpc_args_t
117 format_ethernet_arp_hardware_type (u8 * s, va_list * va)
119 ethernet_arp_hardware_type_t h = va_arg (*va, ethernet_arp_hardware_type_t);
123 #define _(n,f) case n: t = #f; break;
124 foreach_ethernet_arp_hardware_type;
128 return format (s, "unknown 0x%x", h);
131 return format (s, "%s", t);
135 format_ethernet_arp_opcode (u8 * s, va_list * va)
137 ethernet_arp_opcode_t o = va_arg (*va, ethernet_arp_opcode_t);
141 #define _(f) case ETHERNET_ARP_OPCODE_##f: t = #f; break;
142 foreach_ethernet_arp_opcode;
146 return format (s, "unknown 0x%x", o);
149 return format (s, "%s", t);
153 unformat_ethernet_arp_opcode_host_byte_order (unformat_input_t * input,
156 int *result = va_arg (*args, int *);
157 ethernet_arp_main_t *am = ðernet_arp_main;
160 /* Numeric opcode. */
161 if (unformat (input, "0x%x", &x) || unformat (input, "%d", &x))
170 if (unformat_user (input, unformat_vlib_number_by_name,
171 am->opcode_by_name, &i))
181 unformat_ethernet_arp_opcode_net_byte_order (unformat_input_t * input,
184 int *result = va_arg (*args, int *);
186 (input, unformat_ethernet_arp_opcode_host_byte_order, result))
189 *result = clib_host_to_net_u16 ((u16) * result);
194 format_ethernet_arp_header (u8 * s, va_list * va)
196 ethernet_arp_header_t *a = va_arg (*va, ethernet_arp_header_t *);
197 u32 max_header_bytes = va_arg (*va, u32);
199 u16 l2_type, l3_type;
201 if (max_header_bytes != 0 && sizeof (a[0]) > max_header_bytes)
202 return format (s, "ARP header truncated");
204 l2_type = clib_net_to_host_u16 (a->l2_type);
205 l3_type = clib_net_to_host_u16 (a->l3_type);
207 indent = format_get_indent (s);
209 s = format (s, "%U, type %U/%U, address size %d/%d",
210 format_ethernet_arp_opcode, clib_net_to_host_u16 (a->opcode),
211 format_ethernet_arp_hardware_type, l2_type,
212 format_ethernet_type, l3_type,
213 a->n_l2_address_bytes, a->n_l3_address_bytes);
215 if (l2_type == ETHERNET_ARP_HARDWARE_TYPE_ethernet
216 && l3_type == ETHERNET_TYPE_IP4)
218 s = format (s, "\n%U%U/%U -> %U/%U",
219 format_white_space, indent,
220 format_ethernet_address, a->ip4_over_ethernet[0].ethernet,
221 format_ip4_address, &a->ip4_over_ethernet[0].ip4,
222 format_ethernet_address, a->ip4_over_ethernet[1].ethernet,
223 format_ip4_address, &a->ip4_over_ethernet[1].ip4);
227 uword n2 = a->n_l2_address_bytes;
228 uword n3 = a->n_l3_address_bytes;
229 s = format (s, "\n%U%U/%U -> %U/%U",
230 format_white_space, indent,
231 format_hex_bytes, a->data + 0 * n2 + 0 * n3, n2,
232 format_hex_bytes, a->data + 1 * n2 + 0 * n3, n3,
233 format_hex_bytes, a->data + 1 * n2 + 1 * n3, n2,
234 format_hex_bytes, a->data + 2 * n2 + 1 * n3, n3);
241 format_ethernet_arp_ip4_entry (u8 * s, va_list * va)
243 vnet_main_t *vnm = va_arg (*va, vnet_main_t *);
244 ethernet_arp_ip4_entry_t *e = va_arg (*va, ethernet_arp_ip4_entry_t *);
245 vnet_sw_interface_t *si;
249 return format (s, "%=12s%=16s%=6s%=20s%=24s", "Time", "IP4",
250 "Flags", "Ethernet", "Interface");
252 si = vnet_get_sw_interface (vnm, e->sw_if_index);
254 if (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC)
255 flags = format (flags, "S");
257 if (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_DYNAMIC)
258 flags = format (flags, "D");
260 if (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_NO_FIB_ENTRY)
261 flags = format (flags, "N");
263 s = format (s, "%=12U%=16U%=6s%=20U%=24U",
264 format_vlib_cpu_time, vnm->vlib_main, e->cpu_time_last_updated,
265 format_ip4_address, &e->ip4_address,
266 flags ? (char *) flags : "",
267 format_ethernet_address, e->ethernet_address,
268 format_vnet_sw_interface_name, vnm, si);
277 } ethernet_arp_input_trace_t;
280 format_ethernet_arp_input_trace (u8 * s, va_list * va)
282 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
283 CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
284 ethernet_arp_input_trace_t *t = va_arg (*va, ethernet_arp_input_trace_t *);
287 format_ethernet_arp_header,
288 t->packet_data, sizeof (t->packet_data));
294 format_arp_term_input_trace (u8 * s, va_list * va)
296 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
297 CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
298 ethernet_arp_input_trace_t *t = va_arg (*va, ethernet_arp_input_trace_t *);
300 /* arp-term trace data saved is either arp or ip6/icmp6 packet:
301 - for arp, the 1st 16-bit field is hw type of value of 0x0001.
302 - for ip6, the first nibble has value of 6. */
303 s = format (s, "%U", t->packet_data[0] == 0 ?
304 format_ethernet_arp_header : format_ip6_header,
305 t->packet_data, sizeof (t->packet_data));
311 arp_nbr_probe (ip_adjacency_t * adj)
313 vnet_main_t *vnm = vnet_get_main ();
314 ip4_main_t *im = &ip4_main;
315 ip_interface_address_t *ia;
316 ethernet_arp_header_t *h;
317 vnet_hw_interface_t *hi;
318 vnet_sw_interface_t *si;
324 vm = vlib_get_main ();
326 si = vnet_get_sw_interface (vnm, adj->rewrite_header.sw_if_index);
328 if (!(si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
334 ip4_interface_address_matching_destination (im,
335 &adj->sub_type.nbr.next_hop.
345 vlib_packet_template_get_packet (vm, &im->ip4_arp_request_packet_template,
348 hi = vnet_get_sup_hw_interface (vnm, adj->rewrite_header.sw_if_index);
350 clib_memcpy (h->ip4_over_ethernet[0].ethernet,
351 hi->hw_address, sizeof (h->ip4_over_ethernet[0].ethernet));
353 h->ip4_over_ethernet[0].ip4 = src[0];
354 h->ip4_over_ethernet[1].ip4 = adj->sub_type.nbr.next_hop.ip4;
356 b = vlib_get_buffer (vm, bi);
357 vnet_buffer (b)->sw_if_index[VLIB_RX] =
358 vnet_buffer (b)->sw_if_index[VLIB_TX] = adj->rewrite_header.sw_if_index;
360 /* Add encapsulation string for software interface (e.g. ethernet header). */
361 vnet_rewrite_one_header (adj[0], h, sizeof (ethernet_header_t));
362 vlib_buffer_advance (b, -adj->rewrite_header.data_bytes);
365 vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index);
366 u32 *to_next = vlib_frame_vector_args (f);
369 vlib_put_frame_to_node (vm, hi->output_node_index, f);
374 arp_mk_complete (adj_index_t ai, ethernet_arp_ip4_entry_t * e)
376 adj_nbr_update_rewrite
377 (ai, ADJ_NBR_REWRITE_FLAG_COMPLETE,
378 ethernet_build_rewrite (vnet_get_main (),
380 adj_get_link_type (ai), e->ethernet_address));
384 arp_mk_incomplete (adj_index_t ai)
386 ip_adjacency_t *adj = adj_get (ai);
388 adj_nbr_update_rewrite
390 ADJ_NBR_REWRITE_FLAG_INCOMPLETE,
391 ethernet_build_rewrite (vnet_get_main (),
392 adj->rewrite_header.sw_if_index,
394 VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST));
397 static ethernet_arp_ip4_entry_t *
398 arp_entry_find (ethernet_arp_interface_t * eai, const ip4_address_t * addr)
400 ethernet_arp_main_t *am = ðernet_arp_main;
401 ethernet_arp_ip4_entry_t *e = NULL;
404 if (NULL != eai->arp_entries)
406 p = hash_get (eai->arp_entries, addr->as_u32);
410 e = pool_elt_at_index (am->ip4_entry_pool, p[0]);
417 arp_mk_complete_walk (adj_index_t ai, void *ctx)
419 ethernet_arp_ip4_entry_t *e = ctx;
421 arp_mk_complete (ai, e);
423 return (ADJ_WALK_RC_CONTINUE);
427 arp_mk_incomplete_walk (adj_index_t ai, void *ctx)
429 arp_mk_incomplete (ai);
431 return (ADJ_WALK_RC_CONTINUE);
435 arp_update_adjacency (vnet_main_t * vnm, u32 sw_if_index, u32 ai)
437 ethernet_arp_main_t *am = ðernet_arp_main;
438 ethernet_arp_interface_t *arp_int;
439 ethernet_arp_ip4_entry_t *e;
444 vec_validate (am->ethernet_arp_by_sw_if_index, sw_if_index);
445 arp_int = &am->ethernet_arp_by_sw_if_index[sw_if_index];
446 e = arp_entry_find (arp_int, &adj->sub_type.nbr.next_hop.ip4);
448 switch (adj->lookup_next_index)
450 case IP_LOOKUP_NEXT_ARP:
451 case IP_LOOKUP_NEXT_GLEAN:
454 adj_nbr_walk_nh4 (sw_if_index,
455 &e->ip4_address, arp_mk_complete_walk, e);
460 * no matching ARP entry.
461 * construct the rewrite required to for an ARP packet, and stick
462 * that in the adj's pipe to smoke.
464 adj_nbr_update_rewrite
466 ADJ_NBR_REWRITE_FLAG_INCOMPLETE,
467 ethernet_build_rewrite
471 VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST));
474 * since the FIB has added this adj for a route, it makes sense it
475 * may want to forward traffic sometime soon. Let's send a
476 * speculative ARP. just one. If we were to do periodically that
477 * wouldn't be bad either, but that's more code than i'm prepared to
478 * write at this time for relatively little reward.
483 case IP_LOOKUP_NEXT_MCAST:
486 * Construct a partial rewrite from the known ethernet mcast dest MAC
491 rewrite = ethernet_build_rewrite (vnm,
494 ethernet_ip4_mcast_dst_addr ());
495 offset = vec_len (rewrite) - 2;
498 * Complete the remaining fields of the adj's rewrite to direct the
499 * complete of the rewrite at switch time by copying in the IP
500 * dst address's bytes.
501 * Ofset is 2 bytes into the MAC desintation address. And we copy 23 bits
504 adj_mcast_update_rewrite (ai, rewrite, offset, 0x007fffff);
508 case IP_LOOKUP_NEXT_DROP:
509 case IP_LOOKUP_NEXT_PUNT:
510 case IP_LOOKUP_NEXT_LOCAL:
511 case IP_LOOKUP_NEXT_REWRITE:
512 case IP_LOOKUP_NEXT_MCAST_MIDCHAIN:
513 case IP_LOOKUP_NEXT_MIDCHAIN:
514 case IP_LOOKUP_NEXT_ICMP_ERROR:
515 case IP_LOOKUP_N_NEXT:
522 vnet_arp_set_ip4_over_ethernet_internal (vnet_main_t * vnm,
523 vnet_arp_set_ip4_over_ethernet_rpc_args_t
526 ethernet_arp_ip4_entry_t *e = 0;
527 ethernet_arp_main_t *am = ðernet_arp_main;
528 ethernet_arp_ip4_over_ethernet_address_t *a = &args->a;
529 vlib_main_t *vm = vlib_get_main ();
530 int make_new_arp_cache_entry = 1;
532 pending_resolution_t *pr, *mc;
533 ethernet_arp_interface_t *arp_int;
534 int is_static = args->is_static;
535 u32 sw_if_index = args->sw_if_index;
536 int is_no_fib_entry = args->is_no_fib_entry;
538 vec_validate (am->ethernet_arp_by_sw_if_index, sw_if_index);
540 arp_int = &am->ethernet_arp_by_sw_if_index[sw_if_index];
542 if (NULL != arp_int->arp_entries)
544 p = hash_get (arp_int->arp_entries, a->ip4.as_u32);
547 e = pool_elt_at_index (am->ip4_entry_pool, p[0]);
549 /* Refuse to over-write static arp. */
550 if (!is_static && (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC))
552 make_new_arp_cache_entry = 0;
556 if (make_new_arp_cache_entry)
558 pool_get (am->ip4_entry_pool, e);
560 if (NULL == arp_int->arp_entries)
562 arp_int->arp_entries = hash_create (0, sizeof (u32));
565 hash_set (arp_int->arp_entries, a->ip4.as_u32, e - am->ip4_entry_pool);
567 e->sw_if_index = sw_if_index;
568 e->ip4_address = a->ip4;
569 e->fib_entry_index = FIB_NODE_INDEX_INVALID;
570 clib_memcpy (e->ethernet_address,
571 a->ethernet, sizeof (e->ethernet_address));
573 if (!is_no_fib_entry)
577 .fp_proto = FIB_PROTOCOL_IP4,
578 .fp_addr.ip4 = a->ip4,
583 ip4_fib_table_get_index_for_sw_if_index (e->sw_if_index);
585 fib_table_entry_update_one_path (fib_index, &pfx, FIB_SOURCE_ADJ,
586 FIB_ENTRY_FLAG_ATTACHED,
587 FIB_PROTOCOL_IP4, &pfx.fp_addr,
588 e->sw_if_index, ~0, 1, NULL,
589 FIB_ROUTE_PATH_FLAG_NONE);
593 e->flags |= ETHERNET_ARP_IP4_ENTRY_FLAG_NO_FIB_ENTRY;
599 * prevent a DoS attack from the data-plane that
600 * spams us with no-op updates to the MAC address
602 if (0 == memcmp (e->ethernet_address,
603 a->ethernet, sizeof (e->ethernet_address)))
606 /* Update time stamp and ethernet address. */
607 clib_memcpy (e->ethernet_address, a->ethernet,
608 sizeof (e->ethernet_address));
611 e->cpu_time_last_updated = clib_cpu_time_now ();
613 e->flags |= ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC;
615 e->flags |= ETHERNET_ARP_IP4_ENTRY_FLAG_DYNAMIC;
617 adj_nbr_walk_nh4 (sw_if_index, &e->ip4_address, arp_mk_complete_walk, e);
619 /* Customer(s) waiting for this address to be resolved? */
620 p = hash_get (am->pending_resolutions_by_address, a->ip4.as_u32);
626 while (next_index != (u32) ~ 0)
628 pr = pool_elt_at_index (am->pending_resolutions, next_index);
629 vlib_process_signal_event (vm, pr->node_index,
630 pr->type_opaque, pr->data);
631 next_index = pr->next_index;
632 pool_put (am->pending_resolutions, pr);
635 hash_unset (am->pending_resolutions_by_address, a->ip4.as_u32);
638 /* Customer(s) requesting ARP event for this address? */
639 p = hash_get (am->mac_changes_by_address, a->ip4.as_u32);
645 while (next_index != (u32) ~ 0)
647 int (*fp) (u32, u8 *, u32, u32);
649 mc = pool_elt_at_index (am->mac_changes, next_index);
650 fp = mc->data_callback;
652 /* Call the user's data callback, return 1 to suppress dup events */
654 rv = (*fp) (mc->data, a->ethernet, sw_if_index, 0);
657 * Signal the resolver process, as long as the user
658 * says they want to be notified
661 vlib_process_signal_event (vm, mc->node_index,
662 mc->type_opaque, mc->data);
663 next_index = mc->next_index;
671 vnet_register_ip4_arp_resolution_event (vnet_main_t * vnm,
674 uword type_opaque, uword data)
676 ethernet_arp_main_t *am = ðernet_arp_main;
677 ip4_address_t *address = address_arg;
679 pending_resolution_t *pr;
681 pool_get (am->pending_resolutions, pr);
684 pr->node_index = node_index;
685 pr->type_opaque = type_opaque;
687 pr->data_callback = 0;
689 p = hash_get (am->pending_resolutions_by_address, address->as_u32);
692 /* Insert new resolution at the head of the list */
693 pr->next_index = p[0];
694 hash_unset (am->pending_resolutions_by_address, address->as_u32);
697 hash_set (am->pending_resolutions_by_address, address->as_u32,
698 pr - am->pending_resolutions);
702 vnet_add_del_ip4_arp_change_event (vnet_main_t * vnm,
707 uword type_opaque, uword data, int is_add)
709 ethernet_arp_main_t *am = ðernet_arp_main;
710 ip4_address_t *address = address_arg;
712 /* Try to find an existing entry */
713 u32 *first = (u32 *) hash_get (am->mac_changes_by_address, address->as_u32);
715 pending_resolution_t *mc;
716 while (p && *p != ~0)
718 mc = pool_elt_at_index (am->mac_changes, *p);
719 if (mc->node_index == node_index && mc->type_opaque == type_opaque
725 int found = p && *p != ~0;
729 return VNET_API_ERROR_ENTRY_ALREADY_EXISTS;
731 pool_get (am->mac_changes, mc);
732 *mc = (pending_resolution_t)
734 .next_index = ~0,.node_index = node_index,.type_opaque =
735 type_opaque,.data = data,.data_callback = data_callback,.pid =
738 /* Insert new resolution at the end of the list */
739 u32 new_idx = mc - am->mac_changes;
743 hash_set (am->mac_changes_by_address, address->as_u32, new_idx);
748 return VNET_API_ERROR_NO_SUCH_ENTRY;
750 /* Clients may need to clean up pool entries, too */
751 void (*fp) (u32, u8 *) = data_callback;
753 (*fp) (mc->data, 0 /* no new mac addrs */ );
755 /* Remove the entry from the list and delete the entry */
757 pool_put (am->mac_changes, mc);
759 /* Remove from hash if we deleted the last entry */
760 if (*p == ~0 && p == first)
761 hash_unset (am->mac_changes_by_address, address->as_u32);
766 /* Either we drop the packet or we send a reply to the sender. */
770 ARP_INPUT_NEXT_REPLY_TX,
774 #define foreach_ethernet_arp_error \
775 _ (replies_sent, "ARP replies sent") \
776 _ (l2_type_not_ethernet, "L2 type not ethernet") \
777 _ (l3_type_not_ip4, "L3 type not IP4") \
778 _ (l3_src_address_not_local, "IP4 source address not local to subnet") \
779 _ (l3_dst_address_not_local, "IP4 destination address not local to subnet") \
780 _ (l3_src_address_is_local, "IP4 source address matches local interface") \
781 _ (l3_src_address_learned, "ARP request IP4 source address learned") \
782 _ (replies_received, "ARP replies received") \
783 _ (opcode_not_request, "ARP opcode not request") \
784 _ (proxy_arp_replies_sent, "Proxy ARP replies sent") \
785 _ (l2_address_mismatch, "ARP hw addr does not match L2 frame src addr") \
786 _ (missing_interface_address, "ARP missing interface address") \
787 _ (gratuitous_arp, "ARP probe or announcement dropped") \
788 _ (interface_no_table, "Interface is not mapped to an IP table") \
789 _ (interface_not_ip_enabled, "Interface is not IP enabled") \
793 #define _(sym,string) ETHERNET_ARP_ERROR_##sym,
794 foreach_ethernet_arp_error
796 ETHERNET_ARP_N_ERROR,
797 } ethernet_arp_input_error_t;
801 unset_random_arp_entry (void)
803 ethernet_arp_main_t *am = ðernet_arp_main;
804 ethernet_arp_ip4_entry_t *e;
805 vnet_main_t *vnm = vnet_get_main ();
806 ethernet_arp_ip4_over_ethernet_address_t delme;
809 index = pool_next_index (am->ip4_entry_pool, am->arp_delete_rotor);
810 am->arp_delete_rotor = index;
812 /* Try again from elt 0, could happen if an intfc goes down */
815 index = pool_next_index (am->ip4_entry_pool, am->arp_delete_rotor);
816 am->arp_delete_rotor = index;
819 /* Nothing left in the pool */
823 e = pool_elt_at_index (am->ip4_entry_pool, index);
825 clib_memcpy (&delme.ethernet, e->ethernet_address, 6);
826 delme.ip4.as_u32 = e->ip4_address.as_u32;
828 vnet_arp_unset_ip4_over_ethernet (vnm, e->sw_if_index, &delme);
832 arp_unnumbered (vlib_buffer_t * p0,
834 ethernet_header_t * eth0,
835 u32 input_sw_if_index, u32 conn_sw_if_index)
837 vlib_main_t *vm = vlib_get_main ();
838 vnet_main_t *vnm = vnet_get_main ();
839 vnet_interface_main_t *vim = &vnm->interface_main;
840 vnet_sw_interface_t *si;
841 vnet_hw_interface_t *hi;
845 u8 dst_mac_address[6];
847 ethernet_arp_header_t *arp0;
849 /* verify that the input interface is unnumbered to the connected.
850 * the connected interface is the interface on which the subnet is
852 si = &vim->sw_interfaces[input_sw_if_index];
854 if (!(si->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED &&
855 (si->unnumbered_sw_if_index == conn_sw_if_index)))
857 /* the input interface is not unnumbered to the interface on which
858 * the sub-net is configured that covers the ARP request.
859 * So this is not the case for unnumbered.. */
863 /* Save the dst mac address */
864 clib_memcpy (dst_mac_address, eth0->dst_address, sizeof (dst_mac_address));
866 vec_insert (buffers, 1, 0);
869 for (i = 0; i < vec_len (buffers); i++)
871 b0 = vlib_get_buffer (vm, buffers[i]);
872 arp0 = vlib_buffer_get_current (b0);
874 hi = vnet_get_sup_hw_interface (vnm, input_sw_if_index);
875 si = vnet_get_sw_interface (vnm, input_sw_if_index);
877 /* For decoration, most likely */
878 vnet_buffer (b0)->sw_if_index[VLIB_TX] = hi->sw_if_index;
880 /* Fix ARP pkt src address */
881 clib_memcpy (arp0->ip4_over_ethernet[0].ethernet, hi->hw_address, 6);
883 /* Build L2 encaps for this swif */
884 header_size = sizeof (ethernet_header_t);
885 if (si->sub.eth.flags.one_tag)
887 else if (si->sub.eth.flags.two_tags)
890 vlib_buffer_advance (b0, -header_size);
891 eth0 = vlib_buffer_get_current (b0);
893 if (si->sub.eth.flags.one_tag)
895 ethernet_vlan_header_t *outer = (void *) (eth0 + 1);
897 eth0->type = si->sub.eth.flags.dot1ad ?
898 clib_host_to_net_u16 (ETHERNET_TYPE_DOT1AD) :
899 clib_host_to_net_u16 (ETHERNET_TYPE_VLAN);
900 outer->priority_cfi_and_id =
901 clib_host_to_net_u16 (si->sub.eth.outer_vlan_id);
902 outer->type = clib_host_to_net_u16 (ETHERNET_TYPE_ARP);
905 else if (si->sub.eth.flags.two_tags)
907 ethernet_vlan_header_t *outer = (void *) (eth0 + 1);
908 ethernet_vlan_header_t *inner = (void *) (outer + 1);
910 eth0->type = si->sub.eth.flags.dot1ad ?
911 clib_host_to_net_u16 (ETHERNET_TYPE_DOT1AD) :
912 clib_host_to_net_u16 (ETHERNET_TYPE_VLAN);
913 outer->priority_cfi_and_id =
914 clib_host_to_net_u16 (si->sub.eth.outer_vlan_id);
915 outer->type = clib_host_to_net_u16 (ETHERNET_TYPE_VLAN);
916 inner->priority_cfi_and_id =
917 clib_host_to_net_u16 (si->sub.eth.inner_vlan_id);
918 inner->type = clib_host_to_net_u16 (ETHERNET_TYPE_ARP);
923 eth0->type = clib_host_to_net_u16 (ETHERNET_TYPE_ARP);
926 /* Restore the original dst address, set src address */
927 clib_memcpy (eth0->dst_address, dst_mac_address,
928 sizeof (eth0->dst_address));
929 clib_memcpy (eth0->src_address, hi->hw_address,
930 sizeof (eth0->src_address));
932 /* Transmit replicas */
936 vlib_get_frame_to_node (vm, hi->output_node_index);
937 u32 *to_next = vlib_frame_vector_args (f);
938 to_next[0] = buffers[i];
940 vlib_put_frame_to_node (vm, hi->output_node_index, f);
944 /* The regular path outputs the original pkt.. */
945 vnet_buffer (p0)->sw_if_index[VLIB_TX] = input_sw_if_index;
953 arp_learn (vnet_main_t * vnm,
954 ethernet_arp_main_t * am, u32 sw_if_index, void *addr)
956 if (am->limit_arp_cache_size &&
957 pool_elts (am->ip4_entry_pool) >= am->limit_arp_cache_size)
958 unset_random_arp_entry ();
960 vnet_arp_set_ip4_over_ethernet (vnm, sw_if_index, addr, 0, 0);
961 return (ETHERNET_ARP_ERROR_l3_src_address_learned);
965 arp_input (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
967 ethernet_arp_main_t *am = ðernet_arp_main;
968 vnet_main_t *vnm = vnet_get_main ();
969 ip4_main_t *im4 = &ip4_main;
970 u32 n_left_from, next_index, *from, *to_next;
971 u32 n_replies_sent = 0, n_proxy_arp_replies_sent = 0;
973 from = vlib_frame_vector_args (frame);
974 n_left_from = frame->n_vectors;
975 next_index = node->cached_next_index;
977 if (node->flags & VLIB_NODE_FLAG_TRACE)
978 vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
980 sizeof (ethernet_arp_input_trace_t));
982 while (n_left_from > 0)
986 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
988 while (n_left_from > 0 && n_left_to_next > 0)
991 vnet_hw_interface_t *hw_if0;
992 ethernet_arp_header_t *arp0;
993 ethernet_header_t *eth0;
994 ip4_address_t *if_addr0, proxy_src;
995 u32 pi0, error0, next0, sw_if_index0, conn_sw_if_index0, fib_index0;
996 u8 is_request0, dst_is_local0, is_unnum0, is_vrrp_reply0;
997 ethernet_proxy_arp_t *pa;
998 fib_node_index_t dst_fei, src_fei;
1000 fib_entry_flag_t src_flags, dst_flags;
1007 n_left_to_next -= 1;
1010 p0 = vlib_get_buffer (vm, pi0);
1011 arp0 = vlib_buffer_get_current (p0);
1013 is_request0 = arp0->opcode
1014 == clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_request);
1016 error0 = ETHERNET_ARP_ERROR_replies_sent;
1020 clib_net_to_host_u16 (ETHERNET_ARP_HARDWARE_TYPE_ethernet) ?
1021 ETHERNET_ARP_ERROR_l2_type_not_ethernet : error0);
1024 clib_net_to_host_u16 (ETHERNET_TYPE_IP4) ?
1025 ETHERNET_ARP_ERROR_l3_type_not_ip4 : error0);
1027 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
1029 /* not playing the ARP game if the interface is not IPv4 enabled */
1031 (im4->ip_enabled_by_sw_if_index[sw_if_index0] == 0 ?
1032 ETHERNET_ARP_ERROR_interface_not_ip_enabled : error0);
1037 /* Check that IP address is local and matches incoming interface. */
1038 fib_index0 = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);
1039 if (~0 == fib_index0)
1041 error0 = ETHERNET_ARP_ERROR_interface_no_table;
1045 dst_fei = ip4_fib_table_lookup (ip4_fib_get (fib_index0),
1046 &arp0->ip4_over_ethernet[1].ip4,
1048 dst_flags = fib_entry_get_flags (dst_fei);
1050 src_fei = ip4_fib_table_lookup (ip4_fib_get (fib_index0),
1051 &arp0->ip4_over_ethernet[0].ip4,
1053 src_flags = fib_entry_get_flags (src_fei);
1055 conn_sw_if_index0 = fib_entry_get_resolving_interface (dst_fei);
1057 if (!(FIB_ENTRY_FLAG_CONNECTED & dst_flags))
1059 error0 = ETHERNET_ARP_ERROR_l3_dst_address_not_local;
1063 /* Honor unnumbered interface, if any */
1064 is_unnum0 = sw_if_index0 != conn_sw_if_index0;
1066 /* Source must also be local to subnet of matching interface address. */
1067 if (!((FIB_ENTRY_FLAG_ATTACHED & src_flags) ||
1068 (FIB_ENTRY_FLAG_CONNECTED & src_flags)))
1071 * The packet was sent from an address that is not connected nor attached
1072 * i.e. it is not from an address that is covered by a link's sub-net,
1073 * nor is it a already learned host resp.
1075 error0 = ETHERNET_ARP_ERROR_l3_src_address_not_local;
1078 if (sw_if_index0 != fib_entry_get_resolving_interface (src_fei))
1081 * The interface the ARP was received on is not the interface
1082 * on which the covering prefix is configured. Maybe this is a case
1088 /* Reject requests/replies with our local interface address. */
1089 if (FIB_ENTRY_FLAG_LOCAL & src_flags)
1091 error0 = ETHERNET_ARP_ERROR_l3_src_address_is_local;
1095 dst_is_local0 = (FIB_ENTRY_FLAG_LOCAL & dst_flags);
1096 fib_entry_get_prefix (dst_fei, &pfx0);
1097 if_addr0 = &pfx0.fp_addr.ip4;
1099 /* Fill in ethernet header. */
1100 eth0 = ethernet_buffer_get_header (p0);
1104 clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply))
1107 (arp0->ip4_over_ethernet[0].ethernet, vrrp_prefix,
1108 sizeof (vrrp_prefix))));
1110 /* Trash ARP packets whose ARP-level source addresses do not
1111 match their L2-frame-level source addresses, unless it's
1112 a reply from a VRRP virtual router */
1113 if (memcmp (eth0->src_address, arp0->ip4_over_ethernet[0].ethernet,
1114 sizeof (eth0->src_address)) && !is_vrrp_reply0)
1116 error0 = ETHERNET_ARP_ERROR_l2_address_mismatch;
1120 /* Learn or update sender's mapping only for replies to addresses
1121 * that are local to the subnet */
1123 clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply) &&
1126 error0 = arp_learn (vnm, am, sw_if_index0,
1127 &arp0->ip4_over_ethernet[0]);
1133 vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
1134 hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
1136 /* Send reply back through input interface */
1137 vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
1138 next0 = ARP_INPUT_NEXT_REPLY_TX;
1140 arp0->opcode = clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply);
1142 arp0->ip4_over_ethernet[1] = arp0->ip4_over_ethernet[0];
1144 clib_memcpy (arp0->ip4_over_ethernet[0].ethernet,
1145 hw_if0->hw_address, 6);
1146 clib_mem_unaligned (&arp0->ip4_over_ethernet[0].ip4.data_u32, u32) =
1149 /* Hardware must be ethernet-like. */
1150 ASSERT (vec_len (hw_if0->hw_address) == 6);
1152 clib_memcpy (eth0->dst_address, eth0->src_address, 6);
1153 clib_memcpy (eth0->src_address, hw_if0->hw_address, 6);
1155 /* Figure out how much to rewind current data from adjacency. */
1156 /* get the adj from the destination's covering connected */
1161 if (!arp_unnumbered (p0, pi0, eth0,
1162 sw_if_index0, conn_sw_if_index0))
1167 ip_adjacency_t *adj0 = NULL;
1170 if (FIB_ENTRY_FLAG_ATTACHED & src_flags)
1173 * If the source is attached use the adj from that source.
1175 ai = fib_entry_get_adj (src_fei);
1176 if (ADJ_INDEX_INVALID != ai)
1178 adj0 = adj_get (ai);
1184 * Get the glean adj from the cover. This is presumably interface
1185 * sourced, and therefre needs to be a glean adj.
1187 ai = fib_entry_get_adj_for_source
1188 (ip4_fib_table_lookup
1189 (ip4_fib_get (fib_index0),
1190 &arp0->ip4_over_ethernet[1].ip4, 31),
1191 FIB_SOURCE_INTERFACE);
1193 if (ADJ_INDEX_INVALID != ai)
1195 adj0 = adj_get (ai);
1197 if (adj0->lookup_next_index == IP_LOOKUP_NEXT_GLEAN)
1205 vlib_buffer_advance (p0,
1206 -adj0->rewrite_header.data_bytes);
1210 error0 = ETHERNET_ARP_ERROR_missing_interface_address;
1216 /* We are going to reply to this request, so learn the sender */
1217 error0 = arp_learn (vnm, am, sw_if_index0,
1218 &arp0->ip4_over_ethernet[1]);
1220 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1221 n_left_to_next, pi0, next0);
1223 n_replies_sent += 1;
1227 if (0 == arp0->ip4_over_ethernet[0].ip4.as_u32 ||
1228 (arp0->ip4_over_ethernet[0].ip4.as_u32 ==
1229 arp0->ip4_over_ethernet[1].ip4.as_u32))
1231 error0 = ETHERNET_ARP_ERROR_gratuitous_arp;
1234 /* See if proxy arp is configured for the address */
1237 vnet_sw_interface_t *si;
1238 u32 this_addr = clib_net_to_host_u32
1239 (arp0->ip4_over_ethernet[1].ip4.as_u32);
1242 si = vnet_get_sw_interface (vnm, sw_if_index0);
1244 if (!(si->flags & VNET_SW_INTERFACE_FLAG_PROXY_ARP))
1247 fib_index0 = vec_elt (im4->fib_index_by_sw_if_index,
1250 vec_foreach (pa, am->proxy_arps)
1252 u32 lo_addr = clib_net_to_host_u32 (pa->lo_addr);
1253 u32 hi_addr = clib_net_to_host_u32 (pa->hi_addr);
1255 /* an ARP request hit in the proxy-arp table? */
1256 if ((this_addr >= lo_addr && this_addr <= hi_addr) &&
1257 (fib_index0 == pa->fib_index))
1259 eth0 = ethernet_buffer_get_header (p0);
1261 arp0->ip4_over_ethernet[1].ip4.data_u32;
1264 * Rewind buffer, direct code above not to
1265 * think too hard about it.
1267 if_addr0 = &proxy_src;
1269 i32 ethernet_start =
1270 vnet_buffer (p0)->ethernet.start_of_ethernet_header;
1271 i32 rewind = p0->current_data - ethernet_start;
1272 vlib_buffer_advance (p0, -rewind);
1273 n_proxy_arp_replies_sent++;
1281 next0 = ARP_INPUT_NEXT_DROP;
1282 p0->error = node->errors[error0];
1284 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1285 n_left_to_next, pi0, next0);
1288 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1291 vlib_error_count (vm, node->node_index,
1292 ETHERNET_ARP_ERROR_replies_sent,
1293 n_replies_sent - n_proxy_arp_replies_sent);
1295 vlib_error_count (vm, node->node_index,
1296 ETHERNET_ARP_ERROR_proxy_arp_replies_sent,
1297 n_proxy_arp_replies_sent);
1298 return frame->n_vectors;
1301 static char *ethernet_arp_error_strings[] = {
1302 #define _(sym,string) string,
1303 foreach_ethernet_arp_error
1308 VLIB_REGISTER_NODE (arp_input_node, static) =
1310 .function = arp_input,
1311 .name = "arp-input",
1312 .vector_size = sizeof (u32),
1313 .n_errors = ETHERNET_ARP_N_ERROR,
1314 .error_strings = ethernet_arp_error_strings,
1315 .n_next_nodes = ARP_INPUT_N_NEXT,
1317 [ARP_INPUT_NEXT_DROP] = "error-drop",
1318 [ARP_INPUT_NEXT_REPLY_TX] = "interface-output",
1320 .format_buffer = format_ethernet_arp_header,
1321 .format_trace = format_ethernet_arp_input_trace,
1326 ip4_arp_entry_sort (void *a1, void *a2)
1328 ethernet_arp_ip4_entry_t *e1 = a1;
1329 ethernet_arp_ip4_entry_t *e2 = a2;
1332 vnet_main_t *vnm = vnet_get_main ();
1334 cmp = vnet_sw_interface_compare (vnm, e1->sw_if_index, e2->sw_if_index);
1336 cmp = ip4_address_compare (&e1->ip4_address, &e2->ip4_address);
1340 ethernet_arp_ip4_entry_t *
1341 ip4_neighbor_entries (u32 sw_if_index)
1343 ethernet_arp_main_t *am = ðernet_arp_main;
1344 ethernet_arp_ip4_entry_t *n, *ns = 0;
1347 pool_foreach (n, am->ip4_entry_pool, ({
1348 if (sw_if_index != ~0 && n->sw_if_index != sw_if_index)
1350 vec_add1 (ns, n[0]);
1355 vec_sort_with_function (ns, ip4_arp_entry_sort);
1359 static clib_error_t *
1360 show_ip4_arp (vlib_main_t * vm,
1361 unformat_input_t * input, vlib_cli_command_t * cmd)
1363 vnet_main_t *vnm = vnet_get_main ();
1364 ethernet_arp_main_t *am = ðernet_arp_main;
1365 ethernet_arp_ip4_entry_t *e, *es;
1366 ethernet_proxy_arp_t *pa;
1367 clib_error_t *error = 0;
1370 /* Filter entries by interface if given. */
1372 (void) unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index);
1374 es = ip4_neighbor_entries (sw_if_index);
1377 vlib_cli_output (vm, "%U", format_ethernet_arp_ip4_entry, vnm, 0);
1380 vlib_cli_output (vm, "%U", format_ethernet_arp_ip4_entry, vnm, e);
1385 if (vec_len (am->proxy_arps))
1387 vlib_cli_output (vm, "Proxy arps enabled for:");
1388 vec_foreach (pa, am->proxy_arps)
1390 vlib_cli_output (vm, "Fib_index %d %U - %U ",
1392 format_ip4_address, &pa->lo_addr,
1393 format_ip4_address, &pa->hi_addr);
1401 * Display all the IPv4 ARP entries.
1404 * Example of how to display the IPv4 ARP table:
1405 * @cliexstart{show ip arp}
1406 * Time FIB IP4 Flags Ethernet Interface
1407 * 346.3028 0 6.1.1.3 de:ad:be:ef:ba:be GigabitEthernet2/0/0
1408 * 3077.4271 0 6.1.1.4 S de:ad:be:ef:ff:ff GigabitEthernet2/0/0
1409 * 2998.6409 1 6.2.2.3 de:ad:be:ef:00:01 GigabitEthernet2/0/0
1410 * Proxy arps enabled for:
1411 * Fib_index 0 6.0.0.1 - 6.0.0.11
1415 VLIB_CLI_COMMAND (show_ip4_arp_command, static) = {
1416 .path = "show ip arp",
1417 .function = show_ip4_arp,
1418 .short_help = "show ip arp",
1424 pg_edit_t l2_type, l3_type;
1425 pg_edit_t n_l2_address_bytes, n_l3_address_bytes;
1431 } ip4_over_ethernet[2];
1432 } pg_ethernet_arp_header_t;
1435 pg_ethernet_arp_header_init (pg_ethernet_arp_header_t * p)
1437 /* Initialize fields that are not bit fields in the IP header. */
1438 #define _(f) pg_edit_init (&p->f, ethernet_arp_header_t, f);
1441 _(n_l2_address_bytes);
1442 _(n_l3_address_bytes);
1444 _(ip4_over_ethernet[0].ethernet);
1445 _(ip4_over_ethernet[0].ip4);
1446 _(ip4_over_ethernet[1].ethernet);
1447 _(ip4_over_ethernet[1].ip4);
1452 unformat_pg_arp_header (unformat_input_t * input, va_list * args)
1454 pg_stream_t *s = va_arg (*args, pg_stream_t *);
1455 pg_ethernet_arp_header_t *p;
1458 p = pg_create_edit_group (s, sizeof (p[0]), sizeof (ethernet_arp_header_t),
1460 pg_ethernet_arp_header_init (p);
1463 pg_edit_set_fixed (&p->l2_type, ETHERNET_ARP_HARDWARE_TYPE_ethernet);
1464 pg_edit_set_fixed (&p->l3_type, ETHERNET_TYPE_IP4);
1465 pg_edit_set_fixed (&p->n_l2_address_bytes, 6);
1466 pg_edit_set_fixed (&p->n_l3_address_bytes, 4);
1468 if (!unformat (input, "%U: %U/%U -> %U/%U",
1470 unformat_ethernet_arp_opcode_net_byte_order, &p->opcode,
1472 unformat_ethernet_address, &p->ip4_over_ethernet[0].ethernet,
1474 unformat_ip4_address, &p->ip4_over_ethernet[0].ip4,
1476 unformat_ethernet_address, &p->ip4_over_ethernet[1].ethernet,
1478 unformat_ip4_address, &p->ip4_over_ethernet[1].ip4))
1480 /* Free up any edits we may have added. */
1481 pg_free_edit_group (s);
1488 ip4_set_arp_limit (u32 arp_limit)
1490 ethernet_arp_main_t *am = ðernet_arp_main;
1492 am->limit_arp_cache_size = arp_limit;
1497 * @brief Control Plane hook to remove an ARP entry
1500 vnet_arp_unset_ip4_over_ethernet (vnet_main_t * vnm,
1501 u32 sw_if_index, void *a_arg)
1503 ethernet_arp_ip4_over_ethernet_address_t *a = a_arg;
1504 vnet_arp_set_ip4_over_ethernet_rpc_args_t args;
1506 args.sw_if_index = sw_if_index;
1507 args.flags = ETHERNET_ARP_ARGS_REMOVE;
1508 clib_memcpy (&args.a, a, sizeof (*a));
1510 vl_api_rpc_call_main_thread (set_ip4_over_ethernet_rpc_callback,
1511 (u8 *) & args, sizeof (args));
1516 * @brief Internally generated event to flush the ARP cache on an
1517 * interface state change event.
1518 * A flush will remove dynamic ARP entries, and for statics remove the MAC
1519 * address from the corresponding adjacencies.
1522 vnet_arp_flush_ip4_over_ethernet (vnet_main_t * vnm,
1523 u32 sw_if_index, void *a_arg)
1525 ethernet_arp_ip4_over_ethernet_address_t *a = a_arg;
1526 vnet_arp_set_ip4_over_ethernet_rpc_args_t args;
1528 args.sw_if_index = sw_if_index;
1529 args.flags = ETHERNET_ARP_ARGS_FLUSH;
1530 clib_memcpy (&args.a, a, sizeof (*a));
1532 vl_api_rpc_call_main_thread (set_ip4_over_ethernet_rpc_callback,
1533 (u8 *) & args, sizeof (args));
1538 * @brief Internally generated event to populate the ARP cache on an
1539 * interface state change event.
1540 * For static entries this will re-source the adjacencies.
1542 * @param sw_if_index The interface on which the ARP entires are acted
1545 vnet_arp_populate_ip4_over_ethernet (vnet_main_t * vnm,
1546 u32 sw_if_index, void *a_arg)
1548 ethernet_arp_ip4_over_ethernet_address_t *a = a_arg;
1549 vnet_arp_set_ip4_over_ethernet_rpc_args_t args;
1551 args.sw_if_index = sw_if_index;
1552 args.flags = ETHERNET_ARP_ARGS_POPULATE;
1553 clib_memcpy (&args.a, a, sizeof (*a));
1555 vl_api_rpc_call_main_thread (set_ip4_over_ethernet_rpc_callback,
1556 (u8 *) & args, sizeof (args));
1561 * arp_add_del_interface_address
1563 * callback when an interface address is added or deleted
1566 arp_add_del_interface_address (ip4_main_t * im,
1569 ip4_address_t * address,
1571 u32 if_address_index, u32 is_del)
1574 * Flush the ARP cache of all entries covered by the address
1575 * that is being removed.
1577 ethernet_arp_main_t *am = ðernet_arp_main;
1578 ethernet_arp_ip4_entry_t *e;
1580 if (vec_len (am->ethernet_arp_by_sw_if_index) <= sw_if_index)
1585 ethernet_arp_interface_t *eai;
1586 u32 i, *to_delete = 0;
1589 eai = &am->ethernet_arp_by_sw_if_index[sw_if_index];
1592 hash_foreach_pair (pair, eai->arp_entries,
1594 e = pool_elt_at_index(am->ip4_entry_pool,
1596 if (ip4_destination_matches_route (im, &e->ip4_address,
1597 address, address_length))
1599 vec_add1 (to_delete, e - am->ip4_entry_pool);
1604 for (i = 0; i < vec_len (to_delete); i++)
1606 ethernet_arp_ip4_over_ethernet_address_t delme;
1607 e = pool_elt_at_index (am->ip4_entry_pool, to_delete[i]);
1609 clib_memcpy (&delme.ethernet, e->ethernet_address, 6);
1610 delme.ip4.as_u32 = e->ip4_address.as_u32;
1612 vnet_arp_flush_ip4_over_ethernet (vnet_get_main (),
1613 e->sw_if_index, &delme);
1616 vec_free (to_delete);
1620 static clib_error_t *
1621 ethernet_arp_init (vlib_main_t * vm)
1623 ethernet_arp_main_t *am = ðernet_arp_main;
1624 ip4_main_t *im = &ip4_main;
1625 clib_error_t *error;
1628 if ((error = vlib_call_init_function (vm, ethernet_init)))
1631 ethernet_register_input_type (vm, ETHERNET_TYPE_ARP, arp_input_node.index);
1633 pn = pg_get_node (arp_input_node.index);
1634 pn->unformat_edit = unformat_pg_arp_header;
1636 am->opcode_by_name = hash_create_string (0, sizeof (uword));
1637 #define _(o) hash_set_mem (am->opcode_by_name, #o, ETHERNET_ARP_OPCODE_##o);
1638 foreach_ethernet_arp_opcode;
1641 /* $$$ configurable */
1642 am->limit_arp_cache_size = 50000;
1644 am->pending_resolutions_by_address = hash_create (0, sizeof (uword));
1645 am->mac_changes_by_address = hash_create (0, sizeof (uword));
1647 /* don't trace ARP error packets */
1649 vlib_node_runtime_t *rt =
1650 vlib_node_get_runtime (vm, arp_input_node.index);
1653 vnet_pcap_drop_trace_filter_add_del \
1654 (rt->errors[ETHERNET_ARP_ERROR_##a], \
1656 foreach_ethernet_arp_error
1660 ip4_add_del_interface_address_callback_t cb;
1661 cb.function = arp_add_del_interface_address;
1662 cb.function_opaque = 0;
1663 vec_add1 (im->add_del_interface_address_callbacks, cb);
1668 VLIB_INIT_FUNCTION (ethernet_arp_init);
1671 arp_entry_free (ethernet_arp_interface_t * eai, ethernet_arp_ip4_entry_t * e)
1673 ethernet_arp_main_t *am = ðernet_arp_main;
1675 if (FIB_NODE_INDEX_INVALID != e->fib_entry_index)
1676 fib_table_entry_delete_index (e->fib_entry_index, FIB_SOURCE_ADJ);
1677 hash_unset (eai->arp_entries, e->ip4_address.as_u32);
1678 pool_put (am->ip4_entry_pool, e);
1682 vnet_arp_unset_ip4_over_ethernet_internal (vnet_main_t * vnm,
1683 vnet_arp_set_ip4_over_ethernet_rpc_args_t
1686 ethernet_arp_main_t *am = ðernet_arp_main;
1687 ethernet_arp_ip4_entry_t *e;
1688 ethernet_arp_interface_t *eai;
1690 eai = &am->ethernet_arp_by_sw_if_index[args->sw_if_index];
1692 e = arp_entry_find (eai, &args->a.ip4);
1696 arp_entry_free (eai, e);
1698 adj_nbr_walk_nh4 (e->sw_if_index,
1699 &e->ip4_address, arp_mk_incomplete_walk, NULL);
1706 vnet_arp_flush_ip4_over_ethernet_internal (vnet_main_t * vnm,
1707 vnet_arp_set_ip4_over_ethernet_rpc_args_t
1710 ethernet_arp_main_t *am = ðernet_arp_main;
1711 ethernet_arp_ip4_entry_t *e;
1712 ethernet_arp_interface_t *eai;
1714 eai = &am->ethernet_arp_by_sw_if_index[args->sw_if_index];
1716 e = arp_entry_find (eai, &args->a.ip4);
1720 adj_nbr_walk_nh4 (e->sw_if_index,
1721 &e->ip4_address, arp_mk_incomplete_walk, e);
1724 * The difference between flush and unset, is that an unset
1725 * means delete for static and dynamic entries. A flush
1726 * means delete only for dynamic. Flushing is what the DP
1727 * does in response to interface events. unset is only done
1728 * by the control plane.
1730 if (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_DYNAMIC)
1732 arp_entry_free (eai, e);
1739 vnet_arp_populate_ip4_over_ethernet_internal (vnet_main_t * vnm,
1740 vnet_arp_set_ip4_over_ethernet_rpc_args_t
1743 ethernet_arp_main_t *am = ðernet_arp_main;
1744 ethernet_arp_ip4_entry_t *e;
1745 ethernet_arp_interface_t *eai;
1747 eai = &am->ethernet_arp_by_sw_if_index[args->sw_if_index];
1749 e = arp_entry_find (eai, &args->a.ip4);
1753 adj_nbr_walk_nh4 (e->sw_if_index,
1754 &e->ip4_address, arp_mk_complete_walk, e);
1760 set_ip4_over_ethernet_rpc_callback (vnet_arp_set_ip4_over_ethernet_rpc_args_t
1763 vnet_main_t *vm = vnet_get_main ();
1764 ASSERT (vlib_get_thread_index () == 0);
1766 if (a->flags & ETHERNET_ARP_ARGS_REMOVE)
1767 vnet_arp_unset_ip4_over_ethernet_internal (vm, a);
1768 else if (a->flags & ETHERNET_ARP_ARGS_FLUSH)
1769 vnet_arp_flush_ip4_over_ethernet_internal (vm, a);
1770 else if (a->flags & ETHERNET_ARP_ARGS_POPULATE)
1771 vnet_arp_populate_ip4_over_ethernet_internal (vm, a);
1773 vnet_arp_set_ip4_over_ethernet_internal (vm, a);
1777 * @brief Invoked when the interface's admin state changes
1779 static clib_error_t *
1780 ethernet_arp_sw_interface_up_down (vnet_main_t * vnm,
1781 u32 sw_if_index, u32 flags)
1783 ethernet_arp_main_t *am = ðernet_arp_main;
1784 ethernet_arp_ip4_entry_t *e;
1785 u32 i, *to_delete = 0;
1788 pool_foreach (e, am->ip4_entry_pool,
1790 if (e->sw_if_index == sw_if_index)
1791 vec_add1 (to_delete,
1792 e - am->ip4_entry_pool);
1796 for (i = 0; i < vec_len (to_delete); i++)
1798 ethernet_arp_ip4_over_ethernet_address_t delme;
1799 e = pool_elt_at_index (am->ip4_entry_pool, to_delete[i]);
1801 clib_memcpy (&delme.ethernet, e->ethernet_address, 6);
1802 delme.ip4.as_u32 = e->ip4_address.as_u32;
1804 if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
1806 vnet_arp_populate_ip4_over_ethernet (vnm, e->sw_if_index, &delme);
1810 vnet_arp_flush_ip4_over_ethernet (vnm, e->sw_if_index, &delme);
1814 vec_free (to_delete);
1819 VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (ethernet_arp_sw_interface_up_down);
1822 increment_ip4_and_mac_address (ethernet_arp_ip4_over_ethernet_address_t * a)
1827 for (i = 3; i >= 0; i--)
1829 old = a->ip4.as_u8[i];
1830 a->ip4.as_u8[i] += 1;
1831 if (old < a->ip4.as_u8[i])
1835 for (i = 5; i >= 0; i--)
1837 old = a->ethernet[i];
1838 a->ethernet[i] += 1;
1839 if (old < a->ethernet[i])
1845 vnet_arp_set_ip4_over_ethernet (vnet_main_t * vnm,
1846 u32 sw_if_index, void *a_arg,
1847 int is_static, int is_no_fib_entry)
1849 ethernet_arp_ip4_over_ethernet_address_t *a = a_arg;
1850 vnet_arp_set_ip4_over_ethernet_rpc_args_t args;
1852 args.sw_if_index = sw_if_index;
1853 args.is_static = is_static;
1854 args.is_no_fib_entry = is_no_fib_entry;
1856 clib_memcpy (&args.a, a, sizeof (*a));
1858 vl_api_rpc_call_main_thread (set_ip4_over_ethernet_rpc_callback,
1859 (u8 *) & args, sizeof (args));
1864 vnet_proxy_arp_add_del (ip4_address_t * lo_addr,
1865 ip4_address_t * hi_addr, u32 fib_index, int is_del)
1867 ethernet_arp_main_t *am = ðernet_arp_main;
1868 ethernet_proxy_arp_t *pa;
1869 u32 found_at_index = ~0;
1871 vec_foreach (pa, am->proxy_arps)
1873 if (pa->lo_addr == lo_addr->as_u32
1874 && pa->hi_addr == hi_addr->as_u32 && pa->fib_index == fib_index)
1876 found_at_index = pa - am->proxy_arps;
1881 if (found_at_index != ~0)
1883 /* Delete, otherwise it's already in the table */
1885 vec_delete (am->proxy_arps, 1, found_at_index);
1888 /* delete, no such entry */
1890 return VNET_API_ERROR_NO_SUCH_ENTRY;
1892 /* add, not in table */
1893 vec_add2 (am->proxy_arps, pa, 1);
1894 pa->lo_addr = lo_addr->as_u32;
1895 pa->hi_addr = hi_addr->as_u32;
1896 pa->fib_index = fib_index;
1901 * Remove any proxy arp entries asdociated with the
1905 vnet_proxy_arp_fib_reset (u32 fib_id)
1907 ethernet_arp_main_t *am = ðernet_arp_main;
1908 ethernet_proxy_arp_t *pa;
1909 u32 *entries_to_delete = 0;
1913 fib_index = fib_table_find (FIB_PROTOCOL_IP4, fib_id);
1914 if (~0 == fib_index)
1915 return VNET_API_ERROR_NO_SUCH_ENTRY;
1917 vec_foreach (pa, am->proxy_arps)
1919 if (pa->fib_index == fib_index)
1921 vec_add1 (entries_to_delete, pa - am->proxy_arps);
1925 for (i = 0; i < vec_len (entries_to_delete); i++)
1927 vec_delete (am->proxy_arps, 1, entries_to_delete[i]);
1930 vec_free (entries_to_delete);
1935 static clib_error_t *
1936 ip_arp_add_del_command_fn (vlib_main_t * vm,
1937 unformat_input_t * input, vlib_cli_command_t * cmd)
1939 vnet_main_t *vnm = vnet_get_main ();
1941 ethernet_arp_ip4_over_ethernet_address_t lo_addr, hi_addr, addr;
1948 int is_no_fib_entry = 0;
1951 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
1953 /* set ip arp TenGigE1/1/0/1 1.2.3.4 aa:bb:... or aabb.ccdd... */
1954 if (unformat (input, "%U %U %U",
1955 unformat_vnet_sw_interface, vnm, &sw_if_index,
1956 unformat_ip4_address, &addr.ip4,
1957 unformat_ethernet_address, &addr.ethernet))
1960 else if (unformat (input, "delete") || unformat (input, "del"))
1963 else if (unformat (input, "static"))
1966 else if (unformat (input, "no-fib-entry"))
1967 is_no_fib_entry = 1;
1969 else if (unformat (input, "count %d", &count))
1972 else if (unformat (input, "fib-id %d", &fib_id))
1974 fib_index = fib_table_find (FIB_PROTOCOL_IP4, fib_id);
1976 if (~0 == fib_index)
1977 return clib_error_return (0, "fib ID %d doesn't exist\n", fib_id);
1980 else if (unformat (input, "proxy %U - %U",
1981 unformat_ip4_address, &lo_addr.ip4,
1982 unformat_ip4_address, &hi_addr.ip4))
1990 (void) vnet_proxy_arp_add_del (&lo_addr.ip4, &hi_addr.ip4,
1999 for (i = 0; i < count; i++)
2003 uword event_type, *event_data = 0;
2005 /* Park the debug CLI until the arp entry is installed */
2006 vnet_register_ip4_arp_resolution_event
2007 (vnm, &addr.ip4, vlib_current_process (vm),
2008 1 /* type */ , 0 /* data */ );
2010 vnet_arp_set_ip4_over_ethernet
2011 (vnm, sw_if_index, &addr, is_static, is_no_fib_entry);
2013 vlib_process_wait_for_event (vm);
2014 event_type = vlib_process_get_events (vm, &event_data);
2015 vec_reset_length (event_data);
2016 if (event_type != 1)
2017 clib_warning ("event type %d unexpected", event_type);
2020 vnet_arp_unset_ip4_over_ethernet (vnm, sw_if_index, &addr);
2022 increment_ip4_and_mac_address (&addr);
2027 return clib_error_return (0, "unknown input `%U'",
2028 format_unformat_error, input);
2036 * Add or delete IPv4 ARP cache entries.
2038 * @note 'set ip arp' options (e.g. delete, static, 'fib-id <id>',
2039 * 'count <number>', 'interface ip4_addr mac_addr') can be added in
2040 * any order and combination.
2044 * Add or delete IPv4 ARP cache entries as follows. MAC Address can be in
2045 * either aa:bb:cc:dd:ee:ff format or aabb.ccdd.eeff format.
2046 * @cliexcmd{set ip arp GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2047 * @cliexcmd{set ip arp delete GigabitEthernet2/0/0 6.0.0.3 de:ad:be:ef:ba:be}
2049 * To add or delete an IPv4 ARP cache entry to or from a specific fib
2051 * @cliexcmd{set ip arp fib-id 1 GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2052 * @cliexcmd{set ip arp fib-id 1 delete GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2054 * Add or delete IPv4 static ARP cache entries as follows:
2055 * @cliexcmd{set ip arp static GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2056 * @cliexcmd{set ip arp static delete GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2058 * For testing / debugging purposes, the 'set ip arp' command can add or
2059 * delete multiple entries. Supply the 'count N' parameter:
2060 * @cliexcmd{set ip arp count 10 GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2063 VLIB_CLI_COMMAND (ip_arp_add_del_command, static) = {
2064 .path = "set ip arp",
2066 "set ip arp [del] <intfc> <ip-address> <mac-address> [static] [no-fib-entry] [count <count>] [fib-id <fib-id>] [proxy <lo-addr> - <hi-addr>]",
2067 .function = ip_arp_add_del_command_fn,
2071 static clib_error_t *
2072 set_int_proxy_arp_command_fn (vlib_main_t * vm,
2074 input, vlib_cli_command_t * cmd)
2076 vnet_main_t *vnm = vnet_get_main ();
2078 vnet_sw_interface_t *si;
2082 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2084 if (unformat (input, "%U", unformat_vnet_sw_interface,
2087 else if (unformat (input, "enable") || unformat (input, "on"))
2089 else if (unformat (input, "disable") || unformat (input, "off"))
2096 return clib_error_return (0, "unknown input '%U'",
2097 format_unformat_error, input);
2099 si = vnet_get_sw_interface (vnm, sw_if_index);
2102 si->flags |= VNET_SW_INTERFACE_FLAG_PROXY_ARP;
2104 si->flags &= ~VNET_SW_INTERFACE_FLAG_PROXY_ARP;
2111 * Enable proxy-arp on an interface. The vpp stack will answer ARP
2112 * requests for the indicated address range. Multiple proxy-arp
2113 * ranges may be provisioned.
2115 * @note Proxy ARP as a technology is infamous for blackholing traffic.
2116 * Also, the underlying implementation has not been performance-tuned.
2117 * Avoid creating an unnecessarily large set of ranges.
2120 * To enable proxy arp on a range of addresses, use:
2121 * @cliexcmd{set ip arp proxy 6.0.0.1 - 6.0.0.11}
2122 * Append 'del' to delete a range of proxy ARP addresses:
2123 * @cliexcmd{set ip arp proxy 6.0.0.1 - 6.0.0.11 del}
2124 * You must then specifically enable proxy arp on individual interfaces:
2125 * @cliexcmd{set interface proxy-arp GigabitEthernet0/8/0 enable}
2126 * To disable proxy arp on an individual interface:
2127 * @cliexcmd{set interface proxy-arp GigabitEthernet0/8/0 disable}
2129 VLIB_CLI_COMMAND (set_int_proxy_enable_command, static) = {
2130 .path = "set interface proxy-arp",
2132 "set interface proxy-arp <intfc> [enable|disable]",
2133 .function = set_int_proxy_arp_command_fn,
2139 * ARP/ND Termination in a L2 Bridge Domain based on IP4/IP6 to MAC
2140 * hash tables mac_by_ip4 and mac_by_ip6 for each BD.
2144 ARP_TERM_NEXT_L2_OUTPUT,
2149 u32 arp_term_next_node_index[32];
2152 arp_term_l2bd (vlib_main_t * vm,
2153 vlib_node_runtime_t * node, vlib_frame_t * frame)
2155 l2input_main_t *l2im = &l2input_main;
2156 u32 n_left_from, next_index, *from, *to_next;
2157 u32 n_replies_sent = 0;
2158 u16 last_bd_index = ~0;
2159 l2_bridge_domain_t *last_bd_config = 0;
2160 l2_input_config_t *cfg0;
2162 from = vlib_frame_vector_args (frame);
2163 n_left_from = frame->n_vectors;
2164 next_index = node->cached_next_index;
2166 while (n_left_from > 0)
2170 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2172 while (n_left_from > 0 && n_left_to_next > 0)
2175 ethernet_header_t *eth0;
2176 ethernet_arp_header_t *arp0;
2179 u32 pi0, error0, next0, sw_if_index0;
2191 n_left_to_next -= 1;
2193 p0 = vlib_get_buffer (vm, pi0);
2194 // Terminate only local (SHG == 0) ARP
2195 if (vnet_buffer (p0)->l2.shg != 0)
2196 goto next_l2_feature;
2198 eth0 = vlib_buffer_get_current (p0);
2199 l3h0 = (u8 *) eth0 + vnet_buffer (p0)->l2.l2_len;
2200 ethertype0 = clib_net_to_host_u16 (*(u16 *) (l3h0 - 2));
2201 arp0 = (ethernet_arp_header_t *) l3h0;
2203 if (PREDICT_FALSE ((ethertype0 != ETHERNET_TYPE_ARP) ||
2205 clib_host_to_net_u16
2206 (ETHERNET_ARP_OPCODE_request))))
2209 /* Must be ARP request packet here */
2210 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) &&
2211 (p0->flags & VLIB_BUFFER_IS_TRACED)))
2213 u8 *t0 = vlib_add_trace (vm, node, p0,
2214 sizeof (ethernet_arp_input_trace_t));
2215 clib_memcpy (t0, l3h0, sizeof (ethernet_arp_input_trace_t));
2218 error0 = ETHERNET_ARP_ERROR_replies_sent;
2221 clib_net_to_host_u16 (ETHERNET_ARP_HARDWARE_TYPE_ethernet)
2222 ? ETHERNET_ARP_ERROR_l2_type_not_ethernet : error0);
2225 clib_net_to_host_u16 (ETHERNET_TYPE_IP4) ?
2226 ETHERNET_ARP_ERROR_l3_type_not_ip4 : error0);
2228 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
2235 clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply))
2238 (arp0->ip4_over_ethernet[0].ethernet, vrrp_prefix,
2239 sizeof (vrrp_prefix))));
2241 /* Trash ARP packets whose ARP-level source addresses do not
2242 match their L2-frame-level source addresses, unless it's
2243 a reply from a VRRP virtual router */
2245 (memcmp (eth0->src_address, arp0->ip4_over_ethernet[0].ethernet,
2246 sizeof (eth0->src_address)) && !is_vrrp_reply0))
2248 error0 = ETHERNET_ARP_ERROR_l2_address_mismatch;
2252 /* Check if anyone want ARP request events for L2 BDs */
2254 pending_resolution_t *mc;
2255 ethernet_arp_main_t *am = ðernet_arp_main;
2256 uword *p = hash_get (am->mac_changes_by_address, 0);
2259 u32 next_index = p[0];
2260 while (next_index != (u32) ~ 0)
2262 int (*fp) (u32, u8 *, u32, u32);
2264 mc = pool_elt_at_index (am->mac_changes, next_index);
2265 fp = mc->data_callback;
2266 /* Call the callback, return 1 to suppress dup events */
2268 rv = (*fp) (mc->data,
2269 arp0->ip4_over_ethernet[0].ethernet,
2271 arp0->ip4_over_ethernet[0].ip4.as_u32);
2272 /* Signal the resolver process */
2274 vlib_process_signal_event (vm, mc->node_index,
2275 mc->type_opaque, mc->data);
2276 next_index = mc->next_index;
2281 /* lookup BD mac_by_ip4 hash table for MAC entry */
2282 ip0 = arp0->ip4_over_ethernet[1].ip4.as_u32;
2283 bd_index0 = vnet_buffer (p0)->l2.bd_index;
2284 if (PREDICT_FALSE ((bd_index0 != last_bd_index)
2285 || (last_bd_index == (u16) ~ 0)))
2287 last_bd_index = bd_index0;
2288 last_bd_config = vec_elt_at_index (l2im->bd_configs, bd_index0);
2290 macp0 = (u8 *) hash_get (last_bd_config->mac_by_ip4, ip0);
2292 if (PREDICT_FALSE (!macp0))
2293 goto next_l2_feature; /* MAC not found */
2295 /* MAC found, send ARP reply -
2296 Convert ARP request packet to ARP reply */
2297 arp0->opcode = clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply);
2298 arp0->ip4_over_ethernet[1] = arp0->ip4_over_ethernet[0];
2299 arp0->ip4_over_ethernet[0].ip4.as_u32 = ip0;
2300 clib_memcpy (arp0->ip4_over_ethernet[0].ethernet, macp0, 6);
2301 clib_memcpy (eth0->dst_address, eth0->src_address, 6);
2302 clib_memcpy (eth0->src_address, macp0, 6);
2303 n_replies_sent += 1;
2306 /* For BVI, need to use l2-fwd node to send ARP reply as
2307 l2-output node cannot output packet to BVI properly */
2308 cfg0 = vec_elt_at_index (l2im->configs, sw_if_index0);
2309 if (PREDICT_FALSE (cfg0->bvi))
2311 vnet_buffer (p0)->l2.feature_bitmap |= L2INPUT_FEAT_FWD;
2312 vnet_buffer (p0)->sw_if_index[VLIB_RX] = 0;
2313 goto next_l2_feature;
2316 /* Send ARP/ND reply back out input interface through l2-output */
2317 vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
2318 next0 = ARP_TERM_NEXT_L2_OUTPUT;
2319 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2320 to_next, n_left_to_next, pi0,
2325 /* IP6 ND event notification or solicitation handling to generate
2326 local response instead of flooding */
2327 iph0 = (ip6_header_t *) l3h0;
2328 if (PREDICT_FALSE (ethertype0 == ETHERNET_TYPE_IP6 &&
2329 iph0->protocol == IP_PROTOCOL_ICMP6 &&
2330 !ip6_address_is_unspecified
2331 (&iph0->src_address)))
2333 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
2334 if (vnet_ip6_nd_term
2335 (vm, node, p0, eth0, iph0, sw_if_index0,
2336 vnet_buffer (p0)->l2.bd_index))
2337 goto output_response;
2342 u32 feature_bitmap0 =
2343 vnet_buffer (p0)->l2.feature_bitmap & ~L2INPUT_FEAT_ARP_TERM;
2344 vnet_buffer (p0)->l2.feature_bitmap = feature_bitmap0;
2346 feat_bitmap_get_next_node_index (arp_term_next_node_index,
2348 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2349 to_next, n_left_to_next,
2355 if (0 == arp0->ip4_over_ethernet[0].ip4.as_u32 ||
2356 (arp0->ip4_over_ethernet[0].ip4.as_u32 ==
2357 arp0->ip4_over_ethernet[1].ip4.as_u32))
2359 error0 = ETHERNET_ARP_ERROR_gratuitous_arp;
2361 next0 = ARP_TERM_NEXT_DROP;
2362 p0->error = node->errors[error0];
2364 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2365 to_next, n_left_to_next, pi0,
2369 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2372 vlib_error_count (vm, node->node_index,
2373 ETHERNET_ARP_ERROR_replies_sent, n_replies_sent);
2374 return frame->n_vectors;
2378 VLIB_REGISTER_NODE (arp_term_l2bd_node, static) = {
2379 .function = arp_term_l2bd,
2380 .name = "arp-term-l2bd",
2381 .vector_size = sizeof (u32),
2382 .n_errors = ETHERNET_ARP_N_ERROR,
2383 .error_strings = ethernet_arp_error_strings,
2384 .n_next_nodes = ARP_TERM_N_NEXT,
2386 [ARP_TERM_NEXT_L2_OUTPUT] = "l2-output",
2387 [ARP_TERM_NEXT_DROP] = "error-drop",
2389 .format_buffer = format_ethernet_arp_header,
2390 .format_trace = format_arp_term_input_trace,
2395 arp_term_init (vlib_main_t * vm)
2397 // Initialize the feature next-node indexes
2398 feat_bitmap_init_next_nodes (vm,
2399 arp_term_l2bd_node.index,
2401 l2input_get_feat_names (),
2402 arp_term_next_node_index);
2406 VLIB_INIT_FUNCTION (arp_term_init);
2409 change_arp_mac (u32 sw_if_index, ethernet_arp_ip4_entry_t * e)
2411 if (e->sw_if_index == sw_if_index)
2413 adj_nbr_walk_nh4 (e->sw_if_index,
2414 &e->ip4_address, arp_mk_complete_walk, e);
2419 ethernet_arp_change_mac (u32 sw_if_index)
2421 ethernet_arp_main_t *am = ðernet_arp_main;
2422 ethernet_arp_ip4_entry_t *e;
2425 pool_foreach (e, am->ip4_entry_pool,
2427 change_arp_mac (sw_if_index, e);
2433 * fd.io coding-style-patch-verification: ON
2436 * eval: (c-set-style "gnu")