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_LOAD_BALANCE:
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 clib_memcpy (e->ethernet_address,
568 a->ethernet, sizeof (e->ethernet_address));
570 if (!is_no_fib_entry)
574 .fp_proto = FIB_PROTOCOL_IP4,
575 .fp_addr.ip4 = a->ip4,
580 ip4_fib_table_get_index_for_sw_if_index (e->sw_if_index);
582 fib_table_entry_update_one_path (fib_index, &pfx, FIB_SOURCE_ADJ,
583 FIB_ENTRY_FLAG_ATTACHED,
584 FIB_PROTOCOL_IP4, &pfx.fp_addr,
585 e->sw_if_index, ~0, 1, NULL,
586 FIB_ROUTE_PATH_FLAG_NONE);
587 e->flags |= ETHERNET_ARP_IP4_ENTRY_FLAG_NO_FIB_ENTRY;
593 * prevent a DoS attack from the data-plane that
594 * spams us with no-op updates to the MAC address
596 if (0 == memcmp (e->ethernet_address,
597 a->ethernet, sizeof (e->ethernet_address)))
600 /* Update time stamp and ethernet address. */
601 clib_memcpy (e->ethernet_address, a->ethernet,
602 sizeof (e->ethernet_address));
605 e->cpu_time_last_updated = clib_cpu_time_now ();
607 e->flags |= ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC;
609 e->flags |= ETHERNET_ARP_IP4_ENTRY_FLAG_DYNAMIC;
611 adj_nbr_walk_nh4 (sw_if_index, &e->ip4_address, arp_mk_complete_walk, e);
613 /* Customer(s) waiting for this address to be resolved? */
614 p = hash_get (am->pending_resolutions_by_address, a->ip4.as_u32);
620 while (next_index != (u32) ~ 0)
622 pr = pool_elt_at_index (am->pending_resolutions, next_index);
623 vlib_process_signal_event (vm, pr->node_index,
624 pr->type_opaque, pr->data);
625 next_index = pr->next_index;
626 pool_put (am->pending_resolutions, pr);
629 hash_unset (am->pending_resolutions_by_address, a->ip4.as_u32);
632 /* Customer(s) requesting ARP event for this address? */
633 p = hash_get (am->mac_changes_by_address, a->ip4.as_u32);
639 while (next_index != (u32) ~ 0)
641 int (*fp) (u32, u8 *, u32, u32);
643 mc = pool_elt_at_index (am->mac_changes, next_index);
644 fp = mc->data_callback;
646 /* Call the user's data callback, return 1 to suppress dup events */
648 rv = (*fp) (mc->data, a->ethernet, sw_if_index, 0);
651 * Signal the resolver process, as long as the user
652 * says they want to be notified
655 vlib_process_signal_event (vm, mc->node_index,
656 mc->type_opaque, mc->data);
657 next_index = mc->next_index;
665 vnet_register_ip4_arp_resolution_event (vnet_main_t * vnm,
668 uword type_opaque, uword data)
670 ethernet_arp_main_t *am = ðernet_arp_main;
671 ip4_address_t *address = address_arg;
673 pending_resolution_t *pr;
675 pool_get (am->pending_resolutions, pr);
678 pr->node_index = node_index;
679 pr->type_opaque = type_opaque;
681 pr->data_callback = 0;
683 p = hash_get (am->pending_resolutions_by_address, address->as_u32);
686 /* Insert new resolution at the head of the list */
687 pr->next_index = p[0];
688 hash_unset (am->pending_resolutions_by_address, address->as_u32);
691 hash_set (am->pending_resolutions_by_address, address->as_u32,
692 pr - am->pending_resolutions);
696 vnet_add_del_ip4_arp_change_event (vnet_main_t * vnm,
701 uword type_opaque, uword data, int is_add)
703 ethernet_arp_main_t *am = ðernet_arp_main;
704 ip4_address_t *address = address_arg;
706 pending_resolution_t *mc;
707 void (*fp) (u32, u8 *) = data_callback;
711 pool_get (am->mac_changes, mc);
714 mc->node_index = node_index;
715 mc->type_opaque = type_opaque;
717 mc->data_callback = data_callback;
720 p = hash_get (am->mac_changes_by_address, address->as_u32);
723 /* Insert new resolution at the head of the list */
724 mc->next_index = p[0];
725 hash_unset (am->mac_changes_by_address, address->as_u32);
728 hash_set (am->mac_changes_by_address, address->as_u32,
729 mc - am->mac_changes);
735 pending_resolution_t *mc_last = 0;
737 p = hash_get (am->mac_changes_by_address, address->as_u32);
739 return VNET_API_ERROR_NO_SUCH_ENTRY;
743 while (index != (u32) ~ 0)
745 mc = pool_elt_at_index (am->mac_changes, index);
746 if (mc->node_index == node_index &&
747 mc->type_opaque == type_opaque && mc->pid == pid)
749 /* Clients may need to clean up pool entries, too */
751 (*fp) (mc->data, 0 /* no new mac addrs */ );
754 hash_unset (am->mac_changes_by_address, address->as_u32);
755 if (mc->next_index != ~0)
756 hash_set (am->mac_changes_by_address, address->as_u32,
758 pool_put (am->mac_changes, mc);
764 mc_last->next_index = mc->next_index;
765 pool_put (am->mac_changes, mc);
770 index = mc->next_index;
773 return VNET_API_ERROR_NO_SUCH_ENTRY;
777 /* Either we drop the packet or we send a reply to the sender. */
781 ARP_INPUT_NEXT_REPLY_TX,
785 #define foreach_ethernet_arp_error \
786 _ (replies_sent, "ARP replies sent") \
787 _ (l2_type_not_ethernet, "L2 type not ethernet") \
788 _ (l3_type_not_ip4, "L3 type not IP4") \
789 _ (l3_src_address_not_local, "IP4 source address not local to subnet") \
790 _ (l3_dst_address_not_local, "IP4 destination address not local to subnet") \
791 _ (l3_src_address_is_local, "IP4 source address matches local interface") \
792 _ (l3_src_address_learned, "ARP request IP4 source address learned") \
793 _ (replies_received, "ARP replies received") \
794 _ (opcode_not_request, "ARP opcode not request") \
795 _ (proxy_arp_replies_sent, "Proxy ARP replies sent") \
796 _ (l2_address_mismatch, "ARP hw addr does not match L2 frame src addr") \
797 _ (missing_interface_address, "ARP missing interface address") \
798 _ (gratuitous_arp, "ARP probe or announcement dropped") \
799 _ (interface_no_table, "Interface is not mapped to an IP table") \
800 _ (interface_not_ip_enabled, "Interface is not IP enabled") \
804 #define _(sym,string) ETHERNET_ARP_ERROR_##sym,
805 foreach_ethernet_arp_error
807 ETHERNET_ARP_N_ERROR,
808 } ethernet_arp_input_error_t;
812 unset_random_arp_entry (void)
814 ethernet_arp_main_t *am = ðernet_arp_main;
815 ethernet_arp_ip4_entry_t *e;
816 vnet_main_t *vnm = vnet_get_main ();
817 ethernet_arp_ip4_over_ethernet_address_t delme;
820 index = pool_next_index (am->ip4_entry_pool, am->arp_delete_rotor);
821 am->arp_delete_rotor = index;
823 /* Try again from elt 0, could happen if an intfc goes down */
826 index = pool_next_index (am->ip4_entry_pool, am->arp_delete_rotor);
827 am->arp_delete_rotor = index;
830 /* Nothing left in the pool */
834 e = pool_elt_at_index (am->ip4_entry_pool, index);
836 clib_memcpy (&delme.ethernet, e->ethernet_address, 6);
837 delme.ip4.as_u32 = e->ip4_address.as_u32;
839 vnet_arp_unset_ip4_over_ethernet (vnm, e->sw_if_index, &delme);
843 arp_unnumbered (vlib_buffer_t * p0,
844 u32 pi0, ethernet_header_t * eth0, u32 sw_if_index)
846 vlib_main_t *vm = vlib_get_main ();
847 vnet_main_t *vnm = vnet_get_main ();
848 vnet_interface_main_t *vim = &vnm->interface_main;
849 vnet_sw_interface_t *si;
850 vnet_hw_interface_t *hi;
851 u32 unnum_src_sw_if_index;
852 u32 *broadcast_swifs = 0;
857 u8 dst_mac_address[6];
859 ethernet_arp_header_t *arp0;
861 /* Save the dst mac address */
862 clib_memcpy (dst_mac_address, eth0->dst_address, sizeof (dst_mac_address));
864 /* Figure out which sw_if_index supplied the address */
865 unnum_src_sw_if_index = sw_if_index;
867 /* Track down all users of the unnumbered source */
869 pool_foreach (si, vim->sw_interfaces,
871 if (si->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED &&
872 (si->unnumbered_sw_if_index == unnum_src_sw_if_index))
874 vec_add1 (broadcast_swifs, si->sw_if_index);
879 /* If there are no interfaces un-unmbered to this interface,
881 if (0 == vec_len (broadcast_swifs))
884 /* Allocate buffering if we need it */
885 if (vec_len (broadcast_swifs) > 1)
887 vec_validate (buffers, vec_len (broadcast_swifs) - 2);
888 n_alloc = vlib_buffer_alloc (vm, buffers, vec_len (buffers));
889 _vec_len (buffers) = n_alloc;
890 for (i = 0; i < n_alloc; i++)
892 b0 = vlib_get_buffer (vm, buffers[i]);
894 /* xerox (partially built) ARP pkt */
895 clib_memcpy (b0->data, p0->data,
896 p0->current_length + p0->current_data);
897 b0->current_data = p0->current_data;
898 b0->current_length = p0->current_length;
899 vnet_buffer (b0)->sw_if_index[VLIB_RX] =
900 vnet_buffer (p0)->sw_if_index[VLIB_RX];
904 vec_insert (buffers, 1, 0);
907 for (i = 0; i < vec_len (buffers); i++)
909 b0 = vlib_get_buffer (vm, buffers[i]);
910 arp0 = vlib_buffer_get_current (b0);
912 hi = vnet_get_sup_hw_interface (vnm, broadcast_swifs[i]);
913 si = vnet_get_sw_interface (vnm, broadcast_swifs[i]);
915 /* For decoration, most likely */
916 vnet_buffer (b0)->sw_if_index[VLIB_TX] = hi->sw_if_index;
918 /* Fix ARP pkt src address */
919 clib_memcpy (arp0->ip4_over_ethernet[0].ethernet, hi->hw_address, 6);
921 /* Build L2 encaps for this swif */
922 header_size = sizeof (ethernet_header_t);
923 if (si->sub.eth.flags.one_tag)
925 else if (si->sub.eth.flags.two_tags)
928 vlib_buffer_advance (b0, -header_size);
929 eth0 = vlib_buffer_get_current (b0);
931 if (si->sub.eth.flags.one_tag)
933 ethernet_vlan_header_t *outer = (void *) (eth0 + 1);
935 eth0->type = si->sub.eth.flags.dot1ad ?
936 clib_host_to_net_u16 (ETHERNET_TYPE_DOT1AD) :
937 clib_host_to_net_u16 (ETHERNET_TYPE_VLAN);
938 outer->priority_cfi_and_id =
939 clib_host_to_net_u16 (si->sub.eth.outer_vlan_id);
940 outer->type = clib_host_to_net_u16 (ETHERNET_TYPE_ARP);
943 else if (si->sub.eth.flags.two_tags)
945 ethernet_vlan_header_t *outer = (void *) (eth0 + 1);
946 ethernet_vlan_header_t *inner = (void *) (outer + 1);
948 eth0->type = si->sub.eth.flags.dot1ad ?
949 clib_host_to_net_u16 (ETHERNET_TYPE_DOT1AD) :
950 clib_host_to_net_u16 (ETHERNET_TYPE_VLAN);
951 outer->priority_cfi_and_id =
952 clib_host_to_net_u16 (si->sub.eth.outer_vlan_id);
953 outer->type = clib_host_to_net_u16 (ETHERNET_TYPE_VLAN);
954 inner->priority_cfi_and_id =
955 clib_host_to_net_u16 (si->sub.eth.inner_vlan_id);
956 inner->type = clib_host_to_net_u16 (ETHERNET_TYPE_ARP);
961 eth0->type = clib_host_to_net_u16 (ETHERNET_TYPE_ARP);
964 /* Restore the original dst address, set src address */
965 clib_memcpy (eth0->dst_address, dst_mac_address,
966 sizeof (eth0->dst_address));
967 clib_memcpy (eth0->src_address, hi->hw_address,
968 sizeof (eth0->src_address));
970 /* Transmit replicas */
974 vlib_get_frame_to_node (vm, hi->output_node_index);
975 u32 *to_next = vlib_frame_vector_args (f);
976 to_next[0] = buffers[i];
978 vlib_put_frame_to_node (vm, hi->output_node_index, f);
982 /* The regular path outputs the original pkt.. */
983 vnet_buffer (p0)->sw_if_index[VLIB_TX] = broadcast_swifs[0];
985 vec_free (broadcast_swifs);
992 arp_input (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
994 ethernet_arp_main_t *am = ðernet_arp_main;
995 vnet_main_t *vnm = vnet_get_main ();
996 ip4_main_t *im4 = &ip4_main;
997 u32 n_left_from, next_index, *from, *to_next;
998 u32 n_replies_sent = 0, n_proxy_arp_replies_sent = 0;
1000 from = vlib_frame_vector_args (frame);
1001 n_left_from = frame->n_vectors;
1002 next_index = node->cached_next_index;
1004 if (node->flags & VLIB_NODE_FLAG_TRACE)
1005 vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
1007 sizeof (ethernet_arp_input_trace_t));
1009 while (n_left_from > 0)
1013 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1015 while (n_left_from > 0 && n_left_to_next > 0)
1018 vnet_hw_interface_t *hw_if0;
1019 ethernet_arp_header_t *arp0;
1020 ethernet_header_t *eth0;
1021 ip4_address_t *if_addr0, proxy_src;
1022 u32 pi0, error0, next0, sw_if_index0, conn_sw_if_index0, fib_index0;
1023 u8 is_request0, dst_is_local0, is_unnum0;
1024 ethernet_proxy_arp_t *pa;
1025 fib_node_index_t dst_fei, src_fei;
1027 fib_entry_flag_t src_flags, dst_flags;
1034 n_left_to_next -= 1;
1037 p0 = vlib_get_buffer (vm, pi0);
1038 arp0 = vlib_buffer_get_current (p0);
1040 is_request0 = arp0->opcode
1041 == clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_request);
1043 error0 = ETHERNET_ARP_ERROR_replies_sent;
1047 clib_net_to_host_u16 (ETHERNET_ARP_HARDWARE_TYPE_ethernet) ?
1048 ETHERNET_ARP_ERROR_l2_type_not_ethernet : error0);
1051 clib_net_to_host_u16 (ETHERNET_TYPE_IP4) ?
1052 ETHERNET_ARP_ERROR_l3_type_not_ip4 : error0);
1054 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
1056 /* not playing the ARP game if the interface is not IPv4 enabled */
1058 (im4->ip_enabled_by_sw_if_index[sw_if_index0] == 0 ?
1059 ETHERNET_ARP_ERROR_interface_not_ip_enabled : error0);
1064 /* Check that IP address is local and matches incoming interface. */
1065 fib_index0 = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);
1066 if (~0 == fib_index0)
1068 error0 = ETHERNET_ARP_ERROR_interface_no_table;
1072 dst_fei = ip4_fib_table_lookup (ip4_fib_get (fib_index0),
1073 &arp0->ip4_over_ethernet[1].ip4,
1075 dst_flags = fib_entry_get_flags (dst_fei);
1077 src_fei = ip4_fib_table_lookup (ip4_fib_get (fib_index0),
1078 &arp0->ip4_over_ethernet[0].ip4,
1080 src_flags = fib_entry_get_flags (src_fei);
1082 conn_sw_if_index0 = fib_entry_get_resolving_interface (dst_fei);
1084 if (!(FIB_ENTRY_FLAG_CONNECTED & dst_flags))
1086 error0 = ETHERNET_ARP_ERROR_l3_dst_address_not_local;
1090 /* Honor unnumbered interface, if any */
1091 is_unnum0 = sw_if_index0 != conn_sw_if_index0;
1093 /* Source must also be local to subnet of matching interface address. */
1094 if (!((FIB_ENTRY_FLAG_ATTACHED & src_flags) ||
1095 (FIB_ENTRY_FLAG_CONNECTED & src_flags)))
1098 * The packet was sent from an address that is not connected nor attached
1099 * i.e. it is not from an address that is covered by a link's sub-net,
1100 * nor is it a already learned host resp.
1102 error0 = ETHERNET_ARP_ERROR_l3_src_address_not_local;
1105 if (sw_if_index0 != fib_entry_get_resolving_interface (src_fei))
1108 * The interface the ARP was received on is not the interface
1109 * on which the covering prefix is configured. Maybe this is a case
1115 /* Reject requests/replies with our local interface address. */
1116 if (FIB_ENTRY_FLAG_LOCAL & src_flags)
1118 error0 = ETHERNET_ARP_ERROR_l3_src_address_is_local;
1122 dst_is_local0 = (FIB_ENTRY_FLAG_LOCAL & dst_flags);
1123 fib_entry_get_prefix (dst_fei, &pfx0);
1124 if_addr0 = &pfx0.fp_addr.ip4;
1126 /* Fill in ethernet header. */
1127 eth0 = ethernet_buffer_get_header (p0);
1129 /* Trash ARP packets whose ARP-level source addresses do not
1130 match their L2-frame-level source addresses */
1131 if (memcmp (eth0->src_address, arp0->ip4_over_ethernet[0].ethernet,
1132 sizeof (eth0->src_address)))
1134 error0 = ETHERNET_ARP_ERROR_l2_address_mismatch;
1138 /* Learn or update sender's mapping only for requests or unicasts
1139 that don't match local interface address. */
1140 if (ethernet_address_cast (eth0->dst_address) ==
1141 ETHERNET_ADDRESS_UNICAST || is_request0)
1143 if (am->limit_arp_cache_size &&
1144 pool_elts (am->ip4_entry_pool) >= am->limit_arp_cache_size)
1145 unset_random_arp_entry ();
1147 vnet_arp_set_ip4_over_ethernet (vnm, sw_if_index0,
1148 &arp0->ip4_over_ethernet[0],
1149 0 /* is_static */ , 0);
1150 error0 = ETHERNET_ARP_ERROR_l3_src_address_learned;
1153 /* Only send a reply for requests sent which match a local interface. */
1154 if (!(is_request0 && dst_is_local0))
1158 clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply) ?
1159 ETHERNET_ARP_ERROR_replies_received : error0);
1165 vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
1166 hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
1168 /* Send reply back through input interface */
1169 vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
1170 next0 = ARP_INPUT_NEXT_REPLY_TX;
1172 arp0->opcode = clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply);
1174 arp0->ip4_over_ethernet[1] = arp0->ip4_over_ethernet[0];
1176 clib_memcpy (arp0->ip4_over_ethernet[0].ethernet,
1177 hw_if0->hw_address, 6);
1178 clib_mem_unaligned (&arp0->ip4_over_ethernet[0].ip4.data_u32, u32) =
1181 /* Hardware must be ethernet-like. */
1182 ASSERT (vec_len (hw_if0->hw_address) == 6);
1184 clib_memcpy (eth0->dst_address, eth0->src_address, 6);
1185 clib_memcpy (eth0->src_address, hw_if0->hw_address, 6);
1187 /* Figure out how much to rewind current data from adjacency. */
1188 /* get the adj from the destination's covering connected */
1193 if (!arp_unnumbered (p0, pi0, eth0, conn_sw_if_index0))
1198 ip_adjacency_t *adj0 = NULL;
1201 if (FIB_ENTRY_FLAG_ATTACHED & src_flags)
1204 * If the source is attached use the adj from that source.
1206 ai = fib_entry_get_adj (src_fei);
1207 if (ADJ_INDEX_INVALID != ai)
1209 adj0 = adj_get (ai);
1215 * Get the glean adj from the cover. This is presumably interface
1216 * sourced, and therefre needs to be a glean adj.
1218 ai = fib_entry_get_adj_for_source
1219 (ip4_fib_table_lookup
1220 (ip4_fib_get (fib_index0),
1221 &arp0->ip4_over_ethernet[1].ip4, 31),
1222 FIB_SOURCE_INTERFACE);
1224 if (ADJ_INDEX_INVALID != ai)
1226 adj0 = adj_get (ai);
1228 if (adj0->lookup_next_index == IP_LOOKUP_NEXT_GLEAN)
1236 vlib_buffer_advance (p0,
1237 -adj0->rewrite_header.data_bytes);
1241 error0 = ETHERNET_ARP_ERROR_missing_interface_address;
1247 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1248 n_left_to_next, pi0, next0);
1250 n_replies_sent += 1;
1254 if (0 == arp0->ip4_over_ethernet[0].ip4.as_u32 ||
1255 (arp0->ip4_over_ethernet[0].ip4.as_u32 ==
1256 arp0->ip4_over_ethernet[1].ip4.as_u32))
1258 error0 = ETHERNET_ARP_ERROR_gratuitous_arp;
1261 /* See if proxy arp is configured for the address */
1264 vnet_sw_interface_t *si;
1265 u32 this_addr = clib_net_to_host_u32
1266 (arp0->ip4_over_ethernet[1].ip4.as_u32);
1269 si = vnet_get_sw_interface (vnm, sw_if_index0);
1271 if (!(si->flags & VNET_SW_INTERFACE_FLAG_PROXY_ARP))
1274 fib_index0 = vec_elt (im4->fib_index_by_sw_if_index,
1277 vec_foreach (pa, am->proxy_arps)
1279 u32 lo_addr = clib_net_to_host_u32 (pa->lo_addr);
1280 u32 hi_addr = clib_net_to_host_u32 (pa->hi_addr);
1282 /* an ARP request hit in the proxy-arp table? */
1283 if ((this_addr >= lo_addr && this_addr <= hi_addr) &&
1284 (fib_index0 == pa->fib_index))
1286 eth0 = ethernet_buffer_get_header (p0);
1288 arp0->ip4_over_ethernet[1].ip4.data_u32;
1291 * Rewind buffer, direct code above not to
1292 * think too hard about it.
1294 if_addr0 = &proxy_src;
1296 i32 ethernet_start =
1297 vnet_buffer (p0)->ethernet.start_of_ethernet_header;
1298 i32 rewind = p0->current_data - ethernet_start;
1299 vlib_buffer_advance (p0, -rewind);
1300 n_proxy_arp_replies_sent++;
1308 next0 = ARP_INPUT_NEXT_DROP;
1309 p0->error = node->errors[error0];
1311 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1312 n_left_to_next, pi0, next0);
1315 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1318 vlib_error_count (vm, node->node_index,
1319 ETHERNET_ARP_ERROR_replies_sent,
1320 n_replies_sent - n_proxy_arp_replies_sent);
1322 vlib_error_count (vm, node->node_index,
1323 ETHERNET_ARP_ERROR_proxy_arp_replies_sent,
1324 n_proxy_arp_replies_sent);
1325 return frame->n_vectors;
1328 static char *ethernet_arp_error_strings[] = {
1329 #define _(sym,string) string,
1330 foreach_ethernet_arp_error
1335 VLIB_REGISTER_NODE (arp_input_node, static) =
1337 .function = arp_input,
1338 .name = "arp-input",
1339 .vector_size = sizeof (u32),
1340 .n_errors = ETHERNET_ARP_N_ERROR,
1341 .error_strings = ethernet_arp_error_strings,
1342 .n_next_nodes = ARP_INPUT_N_NEXT,
1344 [ARP_INPUT_NEXT_DROP] = "error-drop",
1345 [ARP_INPUT_NEXT_REPLY_TX] = "interface-output",
1347 .format_buffer = format_ethernet_arp_header,
1348 .format_trace = format_ethernet_arp_input_trace,
1353 ip4_arp_entry_sort (void *a1, void *a2)
1355 ethernet_arp_ip4_entry_t *e1 = a1;
1356 ethernet_arp_ip4_entry_t *e2 = a2;
1359 vnet_main_t *vnm = vnet_get_main ();
1361 cmp = vnet_sw_interface_compare (vnm, e1->sw_if_index, e2->sw_if_index);
1363 cmp = ip4_address_compare (&e1->ip4_address, &e2->ip4_address);
1367 ethernet_arp_ip4_entry_t *
1368 ip4_neighbor_entries (u32 sw_if_index)
1370 ethernet_arp_main_t *am = ðernet_arp_main;
1371 ethernet_arp_ip4_entry_t *n, *ns = 0;
1374 pool_foreach (n, am->ip4_entry_pool, ({
1375 if (sw_if_index != ~0 && n->sw_if_index != sw_if_index)
1377 vec_add1 (ns, n[0]);
1382 vec_sort_with_function (ns, ip4_arp_entry_sort);
1386 static clib_error_t *
1387 show_ip4_arp (vlib_main_t * vm,
1388 unformat_input_t * input, vlib_cli_command_t * cmd)
1390 vnet_main_t *vnm = vnet_get_main ();
1391 ethernet_arp_main_t *am = ðernet_arp_main;
1392 ethernet_arp_ip4_entry_t *e, *es;
1393 ethernet_proxy_arp_t *pa;
1394 clib_error_t *error = 0;
1397 /* Filter entries by interface if given. */
1399 (void) unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index);
1401 es = ip4_neighbor_entries (sw_if_index);
1404 vlib_cli_output (vm, "%U", format_ethernet_arp_ip4_entry, vnm, 0);
1407 vlib_cli_output (vm, "%U", format_ethernet_arp_ip4_entry, vnm, e);
1412 if (vec_len (am->proxy_arps))
1414 vlib_cli_output (vm, "Proxy arps enabled for:");
1415 vec_foreach (pa, am->proxy_arps)
1417 vlib_cli_output (vm, "Fib_index %d %U - %U ",
1419 format_ip4_address, &pa->lo_addr,
1420 format_ip4_address, &pa->hi_addr);
1428 * Display all the IPv4 ARP entries.
1431 * Example of how to display the IPv4 ARP table:
1432 * @cliexstart{show ip arp}
1433 * Time FIB IP4 Flags Ethernet Interface
1434 * 346.3028 0 6.1.1.3 de:ad:be:ef:ba:be GigabitEthernet2/0/0
1435 * 3077.4271 0 6.1.1.4 S de:ad:be:ef:ff:ff GigabitEthernet2/0/0
1436 * 2998.6409 1 6.2.2.3 de:ad:be:ef:00:01 GigabitEthernet2/0/0
1437 * Proxy arps enabled for:
1438 * Fib_index 0 6.0.0.1 - 6.0.0.11
1442 VLIB_CLI_COMMAND (show_ip4_arp_command, static) = {
1443 .path = "show ip arp",
1444 .function = show_ip4_arp,
1445 .short_help = "show ip arp",
1451 pg_edit_t l2_type, l3_type;
1452 pg_edit_t n_l2_address_bytes, n_l3_address_bytes;
1458 } ip4_over_ethernet[2];
1459 } pg_ethernet_arp_header_t;
1462 pg_ethernet_arp_header_init (pg_ethernet_arp_header_t * p)
1464 /* Initialize fields that are not bit fields in the IP header. */
1465 #define _(f) pg_edit_init (&p->f, ethernet_arp_header_t, f);
1468 _(n_l2_address_bytes);
1469 _(n_l3_address_bytes);
1471 _(ip4_over_ethernet[0].ethernet);
1472 _(ip4_over_ethernet[0].ip4);
1473 _(ip4_over_ethernet[1].ethernet);
1474 _(ip4_over_ethernet[1].ip4);
1479 unformat_pg_arp_header (unformat_input_t * input, va_list * args)
1481 pg_stream_t *s = va_arg (*args, pg_stream_t *);
1482 pg_ethernet_arp_header_t *p;
1485 p = pg_create_edit_group (s, sizeof (p[0]), sizeof (ethernet_arp_header_t),
1487 pg_ethernet_arp_header_init (p);
1490 pg_edit_set_fixed (&p->l2_type, ETHERNET_ARP_HARDWARE_TYPE_ethernet);
1491 pg_edit_set_fixed (&p->l3_type, ETHERNET_TYPE_IP4);
1492 pg_edit_set_fixed (&p->n_l2_address_bytes, 6);
1493 pg_edit_set_fixed (&p->n_l3_address_bytes, 4);
1495 if (!unformat (input, "%U: %U/%U -> %U/%U",
1497 unformat_ethernet_arp_opcode_net_byte_order, &p->opcode,
1499 unformat_ethernet_address, &p->ip4_over_ethernet[0].ethernet,
1501 unformat_ip4_address, &p->ip4_over_ethernet[0].ip4,
1503 unformat_ethernet_address, &p->ip4_over_ethernet[1].ethernet,
1505 unformat_ip4_address, &p->ip4_over_ethernet[1].ip4))
1507 /* Free up any edits we may have added. */
1508 pg_free_edit_group (s);
1515 ip4_set_arp_limit (u32 arp_limit)
1517 ethernet_arp_main_t *am = ðernet_arp_main;
1519 am->limit_arp_cache_size = arp_limit;
1524 * @brief Control Plane hook to remove an ARP entry
1527 vnet_arp_unset_ip4_over_ethernet (vnet_main_t * vnm,
1528 u32 sw_if_index, void *a_arg)
1530 ethernet_arp_ip4_over_ethernet_address_t *a = a_arg;
1531 vnet_arp_set_ip4_over_ethernet_rpc_args_t args;
1533 args.sw_if_index = sw_if_index;
1534 args.flags = ETHERNET_ARP_ARGS_REMOVE;
1535 clib_memcpy (&args.a, a, sizeof (*a));
1537 vl_api_rpc_call_main_thread (set_ip4_over_ethernet_rpc_callback,
1538 (u8 *) & args, sizeof (args));
1543 * @brief Internally generated event to flush the ARP cache on an
1544 * interface state change event.
1545 * A flush will remove dynamic ARP entries, and for statics remove the MAC
1546 * address from the corresponding adjacencies.
1549 vnet_arp_flush_ip4_over_ethernet (vnet_main_t * vnm,
1550 u32 sw_if_index, void *a_arg)
1552 ethernet_arp_ip4_over_ethernet_address_t *a = a_arg;
1553 vnet_arp_set_ip4_over_ethernet_rpc_args_t args;
1555 args.sw_if_index = sw_if_index;
1556 args.flags = ETHERNET_ARP_ARGS_FLUSH;
1557 clib_memcpy (&args.a, a, sizeof (*a));
1559 vl_api_rpc_call_main_thread (set_ip4_over_ethernet_rpc_callback,
1560 (u8 *) & args, sizeof (args));
1565 * @brief Internally generated event to populate the ARP cache on an
1566 * interface state change event.
1567 * For static entries this will re-source the adjacencies.
1569 * @param sw_if_index The interface on which the ARP entires are acted
1572 vnet_arp_populate_ip4_over_ethernet (vnet_main_t * vnm,
1573 u32 sw_if_index, void *a_arg)
1575 ethernet_arp_ip4_over_ethernet_address_t *a = a_arg;
1576 vnet_arp_set_ip4_over_ethernet_rpc_args_t args;
1578 args.sw_if_index = sw_if_index;
1579 args.flags = ETHERNET_ARP_ARGS_POPULATE;
1580 clib_memcpy (&args.a, a, sizeof (*a));
1582 vl_api_rpc_call_main_thread (set_ip4_over_ethernet_rpc_callback,
1583 (u8 *) & args, sizeof (args));
1588 * arp_add_del_interface_address
1590 * callback when an interface address is added or deleted
1593 arp_add_del_interface_address (ip4_main_t * im,
1596 ip4_address_t * address,
1598 u32 if_address_index, u32 is_del)
1601 * Flush the ARP cache of all entries covered by the address
1602 * that is being removed.
1604 ethernet_arp_main_t *am = ðernet_arp_main;
1605 ethernet_arp_ip4_entry_t *e;
1607 if (vec_len (am->ethernet_arp_by_sw_if_index) <= sw_if_index)
1612 ethernet_arp_interface_t *eai;
1613 u32 i, *to_delete = 0;
1616 eai = &am->ethernet_arp_by_sw_if_index[sw_if_index];
1619 hash_foreach_pair (pair, eai->arp_entries,
1621 e = pool_elt_at_index(am->ip4_entry_pool,
1623 if (ip4_destination_matches_route (im, &e->ip4_address,
1624 address, address_length))
1626 vec_add1 (to_delete, e - am->ip4_entry_pool);
1631 for (i = 0; i < vec_len (to_delete); i++)
1633 ethernet_arp_ip4_over_ethernet_address_t delme;
1634 e = pool_elt_at_index (am->ip4_entry_pool, to_delete[i]);
1636 clib_memcpy (&delme.ethernet, e->ethernet_address, 6);
1637 delme.ip4.as_u32 = e->ip4_address.as_u32;
1639 vnet_arp_flush_ip4_over_ethernet (vnet_get_main (),
1640 e->sw_if_index, &delme);
1643 vec_free (to_delete);
1647 static clib_error_t *
1648 ethernet_arp_init (vlib_main_t * vm)
1650 ethernet_arp_main_t *am = ðernet_arp_main;
1651 ip4_main_t *im = &ip4_main;
1652 clib_error_t *error;
1655 if ((error = vlib_call_init_function (vm, ethernet_init)))
1658 ethernet_register_input_type (vm, ETHERNET_TYPE_ARP, arp_input_node.index);
1660 pn = pg_get_node (arp_input_node.index);
1661 pn->unformat_edit = unformat_pg_arp_header;
1663 am->opcode_by_name = hash_create_string (0, sizeof (uword));
1664 #define _(o) hash_set_mem (am->opcode_by_name, #o, ETHERNET_ARP_OPCODE_##o);
1665 foreach_ethernet_arp_opcode;
1668 /* $$$ configurable */
1669 am->limit_arp_cache_size = 50000;
1671 am->pending_resolutions_by_address = hash_create (0, sizeof (uword));
1672 am->mac_changes_by_address = hash_create (0, sizeof (uword));
1674 /* don't trace ARP error packets */
1676 vlib_node_runtime_t *rt =
1677 vlib_node_get_runtime (vm, arp_input_node.index);
1680 vnet_pcap_drop_trace_filter_add_del \
1681 (rt->errors[ETHERNET_ARP_ERROR_##a], \
1683 foreach_ethernet_arp_error
1687 ip4_add_del_interface_address_callback_t cb;
1688 cb.function = arp_add_del_interface_address;
1689 cb.function_opaque = 0;
1690 vec_add1 (im->add_del_interface_address_callbacks, cb);
1695 VLIB_INIT_FUNCTION (ethernet_arp_init);
1698 arp_entry_free (ethernet_arp_interface_t * eai, ethernet_arp_ip4_entry_t * e)
1700 ethernet_arp_main_t *am = ðernet_arp_main;
1702 /* it's safe to delete the ADJ source on the FIB entry, even if it
1704 fib_table_entry_delete_index (e->fib_entry_index, FIB_SOURCE_ADJ);
1705 hash_unset (eai->arp_entries, e->ip4_address.as_u32);
1706 pool_put (am->ip4_entry_pool, e);
1710 vnet_arp_unset_ip4_over_ethernet_internal (vnet_main_t * vnm,
1711 vnet_arp_set_ip4_over_ethernet_rpc_args_t
1714 ethernet_arp_main_t *am = ðernet_arp_main;
1715 ethernet_arp_ip4_entry_t *e;
1716 ethernet_arp_interface_t *eai;
1718 eai = &am->ethernet_arp_by_sw_if_index[args->sw_if_index];
1720 e = arp_entry_find (eai, &args->a.ip4);
1724 arp_entry_free (eai, e);
1726 adj_nbr_walk_nh4 (e->sw_if_index,
1727 &e->ip4_address, arp_mk_incomplete_walk, NULL);
1734 vnet_arp_flush_ip4_over_ethernet_internal (vnet_main_t * vnm,
1735 vnet_arp_set_ip4_over_ethernet_rpc_args_t
1738 ethernet_arp_main_t *am = ðernet_arp_main;
1739 ethernet_arp_ip4_entry_t *e;
1740 ethernet_arp_interface_t *eai;
1742 eai = &am->ethernet_arp_by_sw_if_index[args->sw_if_index];
1744 e = arp_entry_find (eai, &args->a.ip4);
1748 adj_nbr_walk_nh4 (e->sw_if_index,
1749 &e->ip4_address, arp_mk_incomplete_walk, e);
1752 * The difference between flush and unset, is that an unset
1753 * means delete for static and dynamic entries. A flush
1754 * means delete only for dynamic. Flushing is what the DP
1755 * does in response to interface events. unset is only done
1756 * by the control plane.
1758 if (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_DYNAMIC)
1760 arp_entry_free (eai, e);
1767 vnet_arp_populate_ip4_over_ethernet_internal (vnet_main_t * vnm,
1768 vnet_arp_set_ip4_over_ethernet_rpc_args_t
1771 ethernet_arp_main_t *am = ðernet_arp_main;
1772 ethernet_arp_ip4_entry_t *e;
1773 ethernet_arp_interface_t *eai;
1775 eai = &am->ethernet_arp_by_sw_if_index[args->sw_if_index];
1777 e = arp_entry_find (eai, &args->a.ip4);
1781 adj_nbr_walk_nh4 (e->sw_if_index,
1782 &e->ip4_address, arp_mk_complete_walk, e);
1788 set_ip4_over_ethernet_rpc_callback (vnet_arp_set_ip4_over_ethernet_rpc_args_t
1791 vnet_main_t *vm = vnet_get_main ();
1792 ASSERT (os_get_cpu_number () == 0);
1794 if (a->flags & ETHERNET_ARP_ARGS_REMOVE)
1795 vnet_arp_unset_ip4_over_ethernet_internal (vm, a);
1796 else if (a->flags & ETHERNET_ARP_ARGS_FLUSH)
1797 vnet_arp_flush_ip4_over_ethernet_internal (vm, a);
1798 else if (a->flags & ETHERNET_ARP_ARGS_POPULATE)
1799 vnet_arp_populate_ip4_over_ethernet_internal (vm, a);
1801 vnet_arp_set_ip4_over_ethernet_internal (vm, a);
1805 * @brief Invoked when the interface's admin state changes
1807 static clib_error_t *
1808 ethernet_arp_sw_interface_up_down (vnet_main_t * vnm,
1809 u32 sw_if_index, u32 flags)
1811 ethernet_arp_main_t *am = ðernet_arp_main;
1812 ethernet_arp_ip4_entry_t *e;
1813 u32 i, *to_delete = 0;
1816 pool_foreach (e, am->ip4_entry_pool,
1818 if (e->sw_if_index == sw_if_index)
1819 vec_add1 (to_delete,
1820 e - am->ip4_entry_pool);
1824 for (i = 0; i < vec_len (to_delete); i++)
1826 ethernet_arp_ip4_over_ethernet_address_t delme;
1827 e = pool_elt_at_index (am->ip4_entry_pool, to_delete[i]);
1829 clib_memcpy (&delme.ethernet, e->ethernet_address, 6);
1830 delme.ip4.as_u32 = e->ip4_address.as_u32;
1832 if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
1834 vnet_arp_populate_ip4_over_ethernet (vnm, e->sw_if_index, &delme);
1838 vnet_arp_flush_ip4_over_ethernet (vnm, e->sw_if_index, &delme);
1842 vec_free (to_delete);
1847 VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (ethernet_arp_sw_interface_up_down);
1850 increment_ip4_and_mac_address (ethernet_arp_ip4_over_ethernet_address_t * a)
1855 for (i = 3; i >= 0; i--)
1857 old = a->ip4.as_u8[i];
1858 a->ip4.as_u8[i] += 1;
1859 if (old < a->ip4.as_u8[i])
1863 for (i = 5; i >= 0; i--)
1865 old = a->ethernet[i];
1866 a->ethernet[i] += 1;
1867 if (old < a->ethernet[i])
1873 vnet_arp_set_ip4_over_ethernet (vnet_main_t * vnm,
1874 u32 sw_if_index, void *a_arg,
1875 int is_static, int is_no_fib_entry)
1877 ethernet_arp_ip4_over_ethernet_address_t *a = a_arg;
1878 vnet_arp_set_ip4_over_ethernet_rpc_args_t args;
1880 args.sw_if_index = sw_if_index;
1881 args.is_static = is_static;
1882 args.is_no_fib_entry = is_no_fib_entry;
1884 clib_memcpy (&args.a, a, sizeof (*a));
1886 vl_api_rpc_call_main_thread (set_ip4_over_ethernet_rpc_callback,
1887 (u8 *) & args, sizeof (args));
1892 vnet_proxy_arp_add_del (ip4_address_t * lo_addr,
1893 ip4_address_t * hi_addr, u32 fib_index, int is_del)
1895 ethernet_arp_main_t *am = ðernet_arp_main;
1896 ethernet_proxy_arp_t *pa;
1897 u32 found_at_index = ~0;
1899 vec_foreach (pa, am->proxy_arps)
1901 if (pa->lo_addr == lo_addr->as_u32
1902 && pa->hi_addr == hi_addr->as_u32 && pa->fib_index == fib_index)
1904 found_at_index = pa - am->proxy_arps;
1909 if (found_at_index != ~0)
1911 /* Delete, otherwise it's already in the table */
1913 vec_delete (am->proxy_arps, 1, found_at_index);
1916 /* delete, no such entry */
1918 return VNET_API_ERROR_NO_SUCH_ENTRY;
1920 /* add, not in table */
1921 vec_add2 (am->proxy_arps, pa, 1);
1922 pa->lo_addr = lo_addr->as_u32;
1923 pa->hi_addr = hi_addr->as_u32;
1924 pa->fib_index = fib_index;
1929 * Remove any proxy arp entries asdociated with the
1933 vnet_proxy_arp_fib_reset (u32 fib_id)
1935 ip4_main_t *im = &ip4_main;
1936 ethernet_arp_main_t *am = ðernet_arp_main;
1937 ethernet_proxy_arp_t *pa;
1938 u32 *entries_to_delete = 0;
1943 p = hash_get (im->fib_index_by_table_id, fib_id);
1945 return VNET_API_ERROR_NO_SUCH_ENTRY;
1948 vec_foreach (pa, am->proxy_arps)
1950 if (pa->fib_index == fib_index)
1952 vec_add1 (entries_to_delete, pa - am->proxy_arps);
1956 for (i = 0; i < vec_len (entries_to_delete); i++)
1958 vec_delete (am->proxy_arps, 1, entries_to_delete[i]);
1961 vec_free (entries_to_delete);
1966 static clib_error_t *
1967 ip_arp_add_del_command_fn (vlib_main_t * vm,
1968 unformat_input_t * input, vlib_cli_command_t * cmd)
1970 vnet_main_t *vnm = vnet_get_main ();
1972 ethernet_arp_ip4_over_ethernet_address_t lo_addr, hi_addr, addr;
1979 int is_no_fib_entry = 0;
1982 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
1984 /* set ip arp TenGigE1/1/0/1 1.2.3.4 aa:bb:... or aabb.ccdd... */
1985 if (unformat (input, "%U %U %U",
1986 unformat_vnet_sw_interface, vnm, &sw_if_index,
1987 unformat_ip4_address, &addr.ip4,
1988 unformat_ethernet_address, &addr.ethernet))
1991 else if (unformat (input, "delete") || unformat (input, "del"))
1994 else if (unformat (input, "static"))
1997 else if (unformat (input, "no-fib-entry"))
1998 is_no_fib_entry = 1;
2000 else if (unformat (input, "count %d", &count))
2003 else if (unformat (input, "fib-id %d", &fib_id))
2005 ip4_main_t *im = &ip4_main;
2006 uword *p = hash_get (im->fib_index_by_table_id, fib_id);
2008 return clib_error_return (0, "fib ID %d doesn't exist\n", fib_id);
2012 else if (unformat (input, "proxy %U - %U",
2013 unformat_ip4_address, &lo_addr.ip4,
2014 unformat_ip4_address, &hi_addr.ip4))
2022 (void) vnet_proxy_arp_add_del (&lo_addr.ip4, &hi_addr.ip4,
2031 for (i = 0; i < count; i++)
2035 uword event_type, *event_data = 0;
2037 /* Park the debug CLI until the arp entry is installed */
2038 vnet_register_ip4_arp_resolution_event
2039 (vnm, &addr.ip4, vlib_current_process (vm),
2040 1 /* type */ , 0 /* data */ );
2042 vnet_arp_set_ip4_over_ethernet
2043 (vnm, sw_if_index, &addr, is_static, is_no_fib_entry);
2045 vlib_process_wait_for_event (vm);
2046 event_type = vlib_process_get_events (vm, &event_data);
2047 vec_reset_length (event_data);
2048 if (event_type != 1)
2049 clib_warning ("event type %d unexpected", event_type);
2052 vnet_arp_unset_ip4_over_ethernet (vnm, sw_if_index, &addr);
2054 increment_ip4_and_mac_address (&addr);
2059 return clib_error_return (0, "unknown input `%U'",
2060 format_unformat_error, input);
2068 * Add or delete IPv4 ARP cache entries.
2070 * @note 'set ip arp' options (e.g. delete, static, 'fib-id <id>',
2071 * 'count <number>', 'interface ip4_addr mac_addr') can be added in
2072 * any order and combination.
2076 * Add or delete IPv4 ARP cache entries as follows. MAC Address can be in
2077 * either aa:bb:cc:dd:ee:ff format or aabb.ccdd.eeff format.
2078 * @cliexcmd{set ip arp GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2079 * @cliexcmd{set ip arp delete GigabitEthernet2/0/0 6.0.0.3 de:ad:be:ef:ba:be}
2081 * To add or delete an IPv4 ARP cache entry to or from a specific fib
2083 * @cliexcmd{set ip arp fib-id 1 GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2084 * @cliexcmd{set ip arp fib-id 1 delete GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2086 * Add or delete IPv4 static ARP cache entries as follows:
2087 * @cliexcmd{set ip arp static GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2088 * @cliexcmd{set ip arp static delete GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2090 * For testing / debugging purposes, the 'set ip arp' command can add or
2091 * delete multiple entries. Supply the 'count N' parameter:
2092 * @cliexcmd{set ip arp count 10 GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2095 VLIB_CLI_COMMAND (ip_arp_add_del_command, static) = {
2096 .path = "set ip arp",
2098 "set ip arp [del] <intfc> <ip-address> <mac-address> [static] [no-fib-entry] [count <count>] [fib-id <fib-id>] [proxy <lo-addr> - <hi-addr>]",
2099 .function = ip_arp_add_del_command_fn,
2103 static clib_error_t *
2104 set_int_proxy_arp_command_fn (vlib_main_t * vm,
2106 input, vlib_cli_command_t * cmd)
2108 vnet_main_t *vnm = vnet_get_main ();
2110 vnet_sw_interface_t *si;
2114 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2116 if (unformat (input, "%U", unformat_vnet_sw_interface,
2119 else if (unformat (input, "enable") || unformat (input, "on"))
2121 else if (unformat (input, "disable") || unformat (input, "off"))
2128 return clib_error_return (0, "unknown input '%U'",
2129 format_unformat_error, input);
2131 si = vnet_get_sw_interface (vnm, sw_if_index);
2134 si->flags |= VNET_SW_INTERFACE_FLAG_PROXY_ARP;
2136 si->flags &= ~VNET_SW_INTERFACE_FLAG_PROXY_ARP;
2143 * Enable proxy-arp on an interface. The vpp stack will answer ARP
2144 * requests for the indicated address range. Multiple proxy-arp
2145 * ranges may be provisioned.
2147 * @note Proxy ARP as a technology is infamous for blackholing traffic.
2148 * Also, the underlying implementation has not been performance-tuned.
2149 * Avoid creating an unnecessarily large set of ranges.
2152 * To enable proxy arp on a range of addresses, use:
2153 * @cliexcmd{set ip arp proxy 6.0.0.1 - 6.0.0.11}
2154 * Append 'del' to delete a range of proxy ARP addresses:
2155 * @cliexcmd{set ip arp proxy 6.0.0.1 - 6.0.0.11 del}
2156 * You must then specifically enable proxy arp on individual interfaces:
2157 * @cliexcmd{set interface proxy-arp GigabitEthernet0/8/0 enable}
2158 * To disable proxy arp on an individual interface:
2159 * @cliexcmd{set interface proxy-arp GigabitEthernet0/8/0 disable}
2161 VLIB_CLI_COMMAND (set_int_proxy_enable_command, static) = {
2162 .path = "set interface proxy-arp",
2164 "set interface proxy-arp <intfc> [enable|disable]",
2165 .function = set_int_proxy_arp_command_fn,
2171 * ARP/ND Termination in a L2 Bridge Domain based on IP4/IP6 to MAC
2172 * hash tables mac_by_ip4 and mac_by_ip6 for each BD.
2176 ARP_TERM_NEXT_L2_OUTPUT,
2181 u32 arp_term_next_node_index[32];
2184 arp_term_l2bd (vlib_main_t * vm,
2185 vlib_node_runtime_t * node, vlib_frame_t * frame)
2187 l2input_main_t *l2im = &l2input_main;
2188 u32 n_left_from, next_index, *from, *to_next;
2189 u32 n_replies_sent = 0;
2190 u16 last_bd_index = ~0;
2191 l2_bridge_domain_t *last_bd_config = 0;
2192 l2_input_config_t *cfg0;
2194 from = vlib_frame_vector_args (frame);
2195 n_left_from = frame->n_vectors;
2196 next_index = node->cached_next_index;
2198 while (n_left_from > 0)
2202 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2204 while (n_left_from > 0 && n_left_to_next > 0)
2207 ethernet_header_t *eth0;
2208 ethernet_arp_header_t *arp0;
2211 u32 pi0, error0, next0, sw_if_index0;
2222 n_left_to_next -= 1;
2224 p0 = vlib_get_buffer (vm, pi0);
2225 // Terminate only local (SHG == 0) ARP
2226 if (vnet_buffer (p0)->l2.shg != 0)
2227 goto next_l2_feature;
2229 eth0 = vlib_buffer_get_current (p0);
2230 l3h0 = (u8 *) eth0 + vnet_buffer (p0)->l2.l2_len;
2231 ethertype0 = clib_net_to_host_u16 (*(u16 *) (l3h0 - 2));
2232 arp0 = (ethernet_arp_header_t *) l3h0;
2234 if (PREDICT_FALSE ((ethertype0 != ETHERNET_TYPE_ARP) ||
2236 clib_host_to_net_u16
2237 (ETHERNET_ARP_OPCODE_request))))
2240 /* Must be ARP request packet here */
2241 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) &&
2242 (p0->flags & VLIB_BUFFER_IS_TRACED)))
2244 u8 *t0 = vlib_add_trace (vm, node, p0,
2245 sizeof (ethernet_arp_input_trace_t));
2246 clib_memcpy (t0, l3h0, sizeof (ethernet_arp_input_trace_t));
2249 error0 = ETHERNET_ARP_ERROR_replies_sent;
2252 clib_net_to_host_u16 (ETHERNET_ARP_HARDWARE_TYPE_ethernet)
2253 ? ETHERNET_ARP_ERROR_l2_type_not_ethernet : error0);
2256 clib_net_to_host_u16 (ETHERNET_TYPE_IP4) ?
2257 ETHERNET_ARP_ERROR_l3_type_not_ip4 : error0);
2259 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
2264 /* Trash ARP packets whose ARP-level source addresses do not
2265 match their L2-frame-level source addresses */
2268 (eth0->src_address, arp0->ip4_over_ethernet[0].ethernet,
2269 sizeof (eth0->src_address))))
2271 error0 = ETHERNET_ARP_ERROR_l2_address_mismatch;
2275 /* Check if anyone want ARP request events for L2 BDs */
2277 pending_resolution_t *mc;
2278 ethernet_arp_main_t *am = ðernet_arp_main;
2279 uword *p = hash_get (am->mac_changes_by_address, 0);
2282 u32 next_index = p[0];
2283 while (next_index != (u32) ~ 0)
2285 int (*fp) (u32, u8 *, u32, u32);
2287 mc = pool_elt_at_index (am->mac_changes, next_index);
2288 fp = mc->data_callback;
2289 /* Call the callback, return 1 to suppress dup events */
2291 rv = (*fp) (mc->data,
2292 arp0->ip4_over_ethernet[0].ethernet,
2294 arp0->ip4_over_ethernet[0].ip4.as_u32);
2295 /* Signal the resolver process */
2297 vlib_process_signal_event (vm, mc->node_index,
2298 mc->type_opaque, mc->data);
2299 next_index = mc->next_index;
2304 /* lookup BD mac_by_ip4 hash table for MAC entry */
2305 ip0 = arp0->ip4_over_ethernet[1].ip4.as_u32;
2306 bd_index0 = vnet_buffer (p0)->l2.bd_index;
2307 if (PREDICT_FALSE ((bd_index0 != last_bd_index)
2308 || (last_bd_index == (u16) ~ 0)))
2310 last_bd_index = bd_index0;
2311 last_bd_config = vec_elt_at_index (l2im->bd_configs, bd_index0);
2313 macp0 = (u8 *) hash_get (last_bd_config->mac_by_ip4, ip0);
2315 if (PREDICT_FALSE (!macp0))
2316 goto next_l2_feature; /* MAC not found */
2318 /* MAC found, send ARP reply -
2319 Convert ARP request packet to ARP reply */
2320 arp0->opcode = clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply);
2321 arp0->ip4_over_ethernet[1] = arp0->ip4_over_ethernet[0];
2322 arp0->ip4_over_ethernet[0].ip4.as_u32 = ip0;
2323 clib_memcpy (arp0->ip4_over_ethernet[0].ethernet, macp0, 6);
2324 clib_memcpy (eth0->dst_address, eth0->src_address, 6);
2325 clib_memcpy (eth0->src_address, macp0, 6);
2326 n_replies_sent += 1;
2329 /* For BVI, need to use l2-fwd node to send ARP reply as
2330 l2-output node cannot output packet to BVI properly */
2331 cfg0 = vec_elt_at_index (l2im->configs, sw_if_index0);
2332 if (PREDICT_FALSE (cfg0->bvi))
2334 vnet_buffer (p0)->l2.feature_bitmap |= L2INPUT_FEAT_FWD;
2335 vnet_buffer (p0)->sw_if_index[VLIB_RX] = 0;
2336 goto next_l2_feature;
2339 /* Send ARP/ND reply back out input interface through l2-output */
2340 vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
2341 next0 = ARP_TERM_NEXT_L2_OUTPUT;
2342 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2343 to_next, n_left_to_next, pi0,
2348 /* IP6 ND event notification or solicitation handling to generate
2349 local response instead of flooding */
2350 iph0 = (ip6_header_t *) l3h0;
2351 if (PREDICT_FALSE (ethertype0 == ETHERNET_TYPE_IP6 &&
2352 iph0->protocol == IP_PROTOCOL_ICMP6 &&
2353 !ip6_address_is_unspecified
2354 (&iph0->src_address)))
2356 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
2357 if (vnet_ip6_nd_term
2358 (vm, node, p0, eth0, iph0, sw_if_index0,
2359 vnet_buffer (p0)->l2.bd_index))
2360 goto output_response;
2365 u32 feature_bitmap0 =
2366 vnet_buffer (p0)->l2.feature_bitmap & ~L2INPUT_FEAT_ARP_TERM;
2367 vnet_buffer (p0)->l2.feature_bitmap = feature_bitmap0;
2369 feat_bitmap_get_next_node_index (arp_term_next_node_index,
2371 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2372 to_next, n_left_to_next,
2378 if (0 == arp0->ip4_over_ethernet[0].ip4.as_u32 ||
2379 (arp0->ip4_over_ethernet[0].ip4.as_u32 ==
2380 arp0->ip4_over_ethernet[1].ip4.as_u32))
2382 error0 = ETHERNET_ARP_ERROR_gratuitous_arp;
2384 next0 = ARP_TERM_NEXT_DROP;
2385 p0->error = node->errors[error0];
2387 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2388 to_next, n_left_to_next, pi0,
2392 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2395 vlib_error_count (vm, node->node_index,
2396 ETHERNET_ARP_ERROR_replies_sent, n_replies_sent);
2397 return frame->n_vectors;
2401 VLIB_REGISTER_NODE (arp_term_l2bd_node, static) = {
2402 .function = arp_term_l2bd,
2403 .name = "arp-term-l2bd",
2404 .vector_size = sizeof (u32),
2405 .n_errors = ETHERNET_ARP_N_ERROR,
2406 .error_strings = ethernet_arp_error_strings,
2407 .n_next_nodes = ARP_TERM_N_NEXT,
2409 [ARP_TERM_NEXT_L2_OUTPUT] = "l2-output",
2410 [ARP_TERM_NEXT_DROP] = "error-drop",
2412 .format_buffer = format_ethernet_arp_header,
2413 .format_trace = format_arp_term_input_trace,
2418 arp_term_init (vlib_main_t * vm)
2420 // Initialize the feature next-node indexes
2421 feat_bitmap_init_next_nodes (vm,
2422 arp_term_l2bd_node.index,
2424 l2input_get_feat_names (),
2425 arp_term_next_node_index);
2429 VLIB_INIT_FUNCTION (arp_term_init);
2432 change_arp_mac (u32 sw_if_index, ethernet_arp_ip4_entry_t * e)
2434 if (e->sw_if_index == sw_if_index)
2436 adj_nbr_walk_nh4 (e->sw_if_index,
2437 &e->ip4_address, arp_mk_complete_walk, e);
2442 ethernet_arp_change_mac (u32 sw_if_index)
2444 ethernet_arp_main_t *am = ðernet_arp_main;
2445 ethernet_arp_ip4_entry_t *e;
2448 pool_foreach (e, am->ip4_entry_pool,
2450 change_arp_mac (sw_if_index, e);
2456 * fd.io coding-style-patch-verification: ON
2459 * eval: (c-set-style "gnu")