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/fib/fib_entry_src.h>
26 #include <vnet/adj/adj_nbr.h>
27 #include <vnet/adj/adj_mcast.h>
28 #include <vnet/mpls/mpls.h>
34 * This file contains code to manage the IPv4 ARP tables (IP Address
35 * to MAC Address lookup).
39 void vl_api_rpc_call_main_thread (void *fp, u8 * data, u32 data_length);
42 * @brief Per-interface ARP configuration and state
44 typedef struct ethernet_arp_interface_t_
47 * Hash table of ARP entries.
48 * Since this hash table is per-interface, the key is only the IPv4 address.
51 } ethernet_arp_interface_t;
58 } ethernet_proxy_arp_t;
66 /* Used for arp event notification only */
69 } pending_resolution_t;
73 /* Hash tables mapping name to opcode. */
74 uword *opcode_by_name;
76 /* lite beer "glean" adjacency handling */
77 uword *pending_resolutions_by_address;
78 pending_resolution_t *pending_resolutions;
80 /* Mac address change notification */
81 uword *mac_changes_by_address;
82 pending_resolution_t *mac_changes;
84 ethernet_arp_ip4_entry_t *ip4_entry_pool;
86 /* ARP attack mitigation */
88 u32 limit_arp_cache_size;
90 /** Per interface state */
91 ethernet_arp_interface_t *ethernet_arp_by_sw_if_index;
93 /* Proxy arp vector */
94 ethernet_proxy_arp_t *proxy_arps;
95 } ethernet_arp_main_t;
97 static ethernet_arp_main_t ethernet_arp_main;
102 ethernet_arp_ip4_over_ethernet_address_t a;
106 #define ETHERNET_ARP_ARGS_REMOVE (1<<0)
107 #define ETHERNET_ARP_ARGS_FLUSH (1<<1)
108 #define ETHERNET_ARP_ARGS_POPULATE (1<<2)
109 } vnet_arp_set_ip4_over_ethernet_rpc_args_t;
111 static const u8 vrrp_prefix[] = { 0x00, 0x00, 0x5E, 0x00, 0x01 };
113 /* Node index for send_garp_na_process */
114 u32 send_garp_na_process_node_index;
117 set_ip4_over_ethernet_rpc_callback (vnet_arp_set_ip4_over_ethernet_rpc_args_t
121 format_ethernet_arp_hardware_type (u8 * s, va_list * va)
123 ethernet_arp_hardware_type_t h = va_arg (*va, ethernet_arp_hardware_type_t);
127 #define _(n,f) case n: t = #f; break;
128 foreach_ethernet_arp_hardware_type;
132 return format (s, "unknown 0x%x", h);
135 return format (s, "%s", t);
139 format_ethernet_arp_opcode (u8 * s, va_list * va)
141 ethernet_arp_opcode_t o = va_arg (*va, ethernet_arp_opcode_t);
145 #define _(f) case ETHERNET_ARP_OPCODE_##f: t = #f; break;
146 foreach_ethernet_arp_opcode;
150 return format (s, "unknown 0x%x", o);
153 return format (s, "%s", t);
157 unformat_ethernet_arp_opcode_host_byte_order (unformat_input_t * input,
160 int *result = va_arg (*args, int *);
161 ethernet_arp_main_t *am = ðernet_arp_main;
164 /* Numeric opcode. */
165 if (unformat (input, "0x%x", &x) || unformat (input, "%d", &x))
174 if (unformat_user (input, unformat_vlib_number_by_name,
175 am->opcode_by_name, &i))
185 unformat_ethernet_arp_opcode_net_byte_order (unformat_input_t * input,
188 int *result = va_arg (*args, int *);
190 (input, unformat_ethernet_arp_opcode_host_byte_order, result))
193 *result = clib_host_to_net_u16 ((u16) * result);
198 format_ethernet_arp_header (u8 * s, va_list * va)
200 ethernet_arp_header_t *a = va_arg (*va, ethernet_arp_header_t *);
201 u32 max_header_bytes = va_arg (*va, u32);
203 u16 l2_type, l3_type;
205 if (max_header_bytes != 0 && sizeof (a[0]) > max_header_bytes)
206 return format (s, "ARP header truncated");
208 l2_type = clib_net_to_host_u16 (a->l2_type);
209 l3_type = clib_net_to_host_u16 (a->l3_type);
211 indent = format_get_indent (s);
213 s = format (s, "%U, type %U/%U, address size %d/%d",
214 format_ethernet_arp_opcode, clib_net_to_host_u16 (a->opcode),
215 format_ethernet_arp_hardware_type, l2_type,
216 format_ethernet_type, l3_type,
217 a->n_l2_address_bytes, a->n_l3_address_bytes);
219 if (l2_type == ETHERNET_ARP_HARDWARE_TYPE_ethernet
220 && l3_type == ETHERNET_TYPE_IP4)
222 s = format (s, "\n%U%U/%U -> %U/%U",
223 format_white_space, indent,
224 format_ethernet_address, a->ip4_over_ethernet[0].ethernet,
225 format_ip4_address, &a->ip4_over_ethernet[0].ip4,
226 format_ethernet_address, a->ip4_over_ethernet[1].ethernet,
227 format_ip4_address, &a->ip4_over_ethernet[1].ip4);
231 uword n2 = a->n_l2_address_bytes;
232 uword n3 = a->n_l3_address_bytes;
233 s = format (s, "\n%U%U/%U -> %U/%U",
234 format_white_space, indent,
235 format_hex_bytes, a->data + 0 * n2 + 0 * n3, n2,
236 format_hex_bytes, a->data + 1 * n2 + 0 * n3, n3,
237 format_hex_bytes, a->data + 1 * n2 + 1 * n3, n2,
238 format_hex_bytes, a->data + 2 * n2 + 1 * n3, n3);
245 format_ethernet_arp_ip4_entry (u8 * s, va_list * va)
247 vnet_main_t *vnm = va_arg (*va, vnet_main_t *);
248 ethernet_arp_ip4_entry_t *e = va_arg (*va, ethernet_arp_ip4_entry_t *);
249 vnet_sw_interface_t *si;
253 return format (s, "%=12s%=16s%=6s%=20s%=24s", "Time", "IP4",
254 "Flags", "Ethernet", "Interface");
256 si = vnet_get_sw_interface (vnm, e->sw_if_index);
258 if (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC)
259 flags = format (flags, "S");
261 if (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_DYNAMIC)
262 flags = format (flags, "D");
264 if (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_NO_FIB_ENTRY)
265 flags = format (flags, "N");
267 s = format (s, "%=12U%=16U%=6s%=20U%U",
268 format_vlib_cpu_time, vnm->vlib_main, e->cpu_time_last_updated,
269 format_ip4_address, &e->ip4_address,
270 flags ? (char *) flags : "",
271 format_ethernet_address, e->ethernet_address,
272 format_vnet_sw_interface_name, vnm, si);
281 } ethernet_arp_input_trace_t;
284 format_ethernet_arp_input_trace (u8 * s, va_list * va)
286 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
287 CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
288 ethernet_arp_input_trace_t *t = va_arg (*va, ethernet_arp_input_trace_t *);
291 format_ethernet_arp_header,
292 t->packet_data, sizeof (t->packet_data));
298 format_arp_term_input_trace (u8 * s, va_list * va)
300 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
301 CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
302 ethernet_arp_input_trace_t *t = va_arg (*va, ethernet_arp_input_trace_t *);
304 /* arp-term trace data saved is either arp or ip6/icmp6 packet:
305 - for arp, the 1st 16-bit field is hw type of value of 0x0001.
306 - for ip6, the first nibble has value of 6. */
307 s = format (s, "%U", t->packet_data[0] == 0 ?
308 format_ethernet_arp_header : format_ip6_header,
309 t->packet_data, sizeof (t->packet_data));
315 arp_nbr_probe (ip_adjacency_t * adj)
317 vnet_main_t *vnm = vnet_get_main ();
318 ip4_main_t *im = &ip4_main;
319 ip_interface_address_t *ia;
320 ethernet_arp_header_t *h;
321 vnet_hw_interface_t *hi;
322 vnet_sw_interface_t *si;
328 vm = vlib_get_main ();
330 si = vnet_get_sw_interface (vnm, adj->rewrite_header.sw_if_index);
332 if (!(si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
338 ip4_interface_address_matching_destination (im,
339 &adj->sub_type.nbr.next_hop.
349 vlib_packet_template_get_packet (vm, &im->ip4_arp_request_packet_template,
352 hi = vnet_get_sup_hw_interface (vnm, adj->rewrite_header.sw_if_index);
354 clib_memcpy (h->ip4_over_ethernet[0].ethernet,
355 hi->hw_address, sizeof (h->ip4_over_ethernet[0].ethernet));
357 h->ip4_over_ethernet[0].ip4 = src[0];
358 h->ip4_over_ethernet[1].ip4 = adj->sub_type.nbr.next_hop.ip4;
360 b = vlib_get_buffer (vm, bi);
361 vnet_buffer (b)->sw_if_index[VLIB_RX] =
362 vnet_buffer (b)->sw_if_index[VLIB_TX] = adj->rewrite_header.sw_if_index;
364 /* Add encapsulation string for software interface (e.g. ethernet header). */
365 vnet_rewrite_one_header (adj[0], h, sizeof (ethernet_header_t));
366 vlib_buffer_advance (b, -adj->rewrite_header.data_bytes);
369 vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index);
370 u32 *to_next = vlib_frame_vector_args (f);
373 vlib_put_frame_to_node (vm, hi->output_node_index, f);
378 arp_mk_complete (adj_index_t ai, ethernet_arp_ip4_entry_t * e)
380 adj_nbr_update_rewrite
381 (ai, ADJ_NBR_REWRITE_FLAG_COMPLETE,
382 ethernet_build_rewrite (vnet_get_main (),
384 adj_get_link_type (ai), e->ethernet_address));
388 arp_mk_incomplete (adj_index_t ai)
390 ip_adjacency_t *adj = adj_get (ai);
392 adj_nbr_update_rewrite
394 ADJ_NBR_REWRITE_FLAG_INCOMPLETE,
395 ethernet_build_rewrite (vnet_get_main (),
396 adj->rewrite_header.sw_if_index,
398 VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST));
401 static ethernet_arp_ip4_entry_t *
402 arp_entry_find (ethernet_arp_interface_t * eai, const ip4_address_t * addr)
404 ethernet_arp_main_t *am = ðernet_arp_main;
405 ethernet_arp_ip4_entry_t *e = NULL;
408 if (NULL != eai->arp_entries)
410 p = hash_get (eai->arp_entries, addr->as_u32);
414 e = pool_elt_at_index (am->ip4_entry_pool, p[0]);
421 arp_mk_complete_walk (adj_index_t ai, void *ctx)
423 ethernet_arp_ip4_entry_t *e = ctx;
425 arp_mk_complete (ai, e);
427 return (ADJ_WALK_RC_CONTINUE);
431 arp_mk_incomplete_walk (adj_index_t ai, void *ctx)
433 arp_mk_incomplete (ai);
435 return (ADJ_WALK_RC_CONTINUE);
439 arp_update_adjacency (vnet_main_t * vnm, u32 sw_if_index, u32 ai)
441 ethernet_arp_main_t *am = ðernet_arp_main;
442 ethernet_arp_interface_t *arp_int;
443 ethernet_arp_ip4_entry_t *e;
448 vec_validate (am->ethernet_arp_by_sw_if_index, sw_if_index);
449 arp_int = &am->ethernet_arp_by_sw_if_index[sw_if_index];
450 e = arp_entry_find (arp_int, &adj->sub_type.nbr.next_hop.ip4);
452 switch (adj->lookup_next_index)
454 case IP_LOOKUP_NEXT_ARP:
455 case IP_LOOKUP_NEXT_GLEAN:
458 adj_nbr_walk_nh4 (sw_if_index,
459 &e->ip4_address, arp_mk_complete_walk, e);
464 * no matching ARP entry.
465 * construct the rewrite required to for an ARP packet, and stick
466 * that in the adj's pipe to smoke.
468 adj_nbr_update_rewrite
470 ADJ_NBR_REWRITE_FLAG_INCOMPLETE,
471 ethernet_build_rewrite
475 VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST));
478 * since the FIB has added this adj for a route, it makes sense it
479 * may want to forward traffic sometime soon. Let's send a
480 * speculative ARP. just one. If we were to do periodically that
481 * wouldn't be bad either, but that's more code than i'm prepared to
482 * write at this time for relatively little reward.
487 case IP_LOOKUP_NEXT_MCAST:
490 * Construct a partial rewrite from the known ethernet mcast dest MAC
495 rewrite = ethernet_build_rewrite (vnm,
498 ethernet_ip4_mcast_dst_addr ());
499 offset = vec_len (rewrite) - 2;
502 * Complete the remaining fields of the adj's rewrite to direct the
503 * complete of the rewrite at switch time by copying in the IP
504 * dst address's bytes.
505 * Ofset is 2 bytes into the MAC desintation address. And we copy 23 bits
508 adj_mcast_update_rewrite (ai, rewrite, offset, 0x007fffff);
512 case IP_LOOKUP_NEXT_DROP:
513 case IP_LOOKUP_NEXT_PUNT:
514 case IP_LOOKUP_NEXT_LOCAL:
515 case IP_LOOKUP_NEXT_REWRITE:
516 case IP_LOOKUP_NEXT_MCAST_MIDCHAIN:
517 case IP_LOOKUP_NEXT_MIDCHAIN:
518 case IP_LOOKUP_NEXT_ICMP_ERROR:
519 case IP_LOOKUP_N_NEXT:
526 vnet_arp_set_ip4_over_ethernet_internal (vnet_main_t * vnm,
527 vnet_arp_set_ip4_over_ethernet_rpc_args_t
530 ethernet_arp_ip4_entry_t *e = 0;
531 ethernet_arp_main_t *am = ðernet_arp_main;
532 ethernet_arp_ip4_over_ethernet_address_t *a = &args->a;
533 vlib_main_t *vm = vlib_get_main ();
534 int make_new_arp_cache_entry = 1;
536 pending_resolution_t *pr, *mc;
537 ethernet_arp_interface_t *arp_int;
538 int is_static = args->is_static;
539 u32 sw_if_index = args->sw_if_index;
540 int is_no_fib_entry = args->is_no_fib_entry;
542 vec_validate (am->ethernet_arp_by_sw_if_index, sw_if_index);
544 arp_int = &am->ethernet_arp_by_sw_if_index[sw_if_index];
546 if (NULL != arp_int->arp_entries)
548 p = hash_get (arp_int->arp_entries, a->ip4.as_u32);
551 e = pool_elt_at_index (am->ip4_entry_pool, p[0]);
553 /* Refuse to over-write static arp. */
554 if (!is_static && (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC))
556 make_new_arp_cache_entry = 0;
560 if (make_new_arp_cache_entry)
562 pool_get (am->ip4_entry_pool, e);
564 if (NULL == arp_int->arp_entries)
566 arp_int->arp_entries = hash_create (0, sizeof (u32));
569 hash_set (arp_int->arp_entries, a->ip4.as_u32, e - am->ip4_entry_pool);
571 e->sw_if_index = sw_if_index;
572 e->ip4_address = a->ip4;
573 e->fib_entry_index = FIB_NODE_INDEX_INVALID;
574 clib_memcpy (e->ethernet_address,
575 a->ethernet, sizeof (e->ethernet_address));
577 if (!is_no_fib_entry)
581 .fp_proto = FIB_PROTOCOL_IP4,
582 .fp_addr.ip4 = a->ip4,
587 ip4_fib_table_get_index_for_sw_if_index (e->sw_if_index);
589 fib_table_entry_path_add (fib_index, &pfx, FIB_SOURCE_ADJ,
590 FIB_ENTRY_FLAG_ATTACHED,
591 DPO_PROTO_IP4, &pfx.fp_addr,
592 e->sw_if_index, ~0, 1, NULL,
593 FIB_ROUTE_PATH_FLAG_NONE);
597 e->flags |= ETHERNET_ARP_IP4_ENTRY_FLAG_NO_FIB_ENTRY;
603 * prevent a DoS attack from the data-plane that
604 * spams us with no-op updates to the MAC address
606 if (0 == memcmp (e->ethernet_address,
607 a->ethernet, sizeof (e->ethernet_address)))
610 /* Update time stamp and ethernet address. */
611 clib_memcpy (e->ethernet_address, a->ethernet,
612 sizeof (e->ethernet_address));
615 e->cpu_time_last_updated = clib_cpu_time_now ();
617 e->flags |= ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC;
619 e->flags |= ETHERNET_ARP_IP4_ENTRY_FLAG_DYNAMIC;
621 adj_nbr_walk_nh4 (sw_if_index, &e->ip4_address, arp_mk_complete_walk, e);
623 /* Customer(s) waiting for this address to be resolved? */
624 p = hash_get (am->pending_resolutions_by_address, a->ip4.as_u32);
630 while (next_index != (u32) ~ 0)
632 pr = pool_elt_at_index (am->pending_resolutions, next_index);
633 vlib_process_signal_event (vm, pr->node_index,
634 pr->type_opaque, pr->data);
635 next_index = pr->next_index;
636 pool_put (am->pending_resolutions, pr);
639 hash_unset (am->pending_resolutions_by_address, a->ip4.as_u32);
642 /* Customer(s) requesting ARP event for this address? */
643 p = hash_get (am->mac_changes_by_address, a->ip4.as_u32);
649 while (next_index != (u32) ~ 0)
651 int (*fp) (u32, u8 *, u32, u32);
653 mc = pool_elt_at_index (am->mac_changes, next_index);
654 fp = mc->data_callback;
656 /* Call the user's data callback, return 1 to suppress dup events */
658 rv = (*fp) (mc->data, a->ethernet, sw_if_index, 0);
661 * Signal the resolver process, as long as the user
662 * says they want to be notified
665 vlib_process_signal_event (vm, mc->node_index,
666 mc->type_opaque, mc->data);
667 next_index = mc->next_index;
675 vnet_register_ip4_arp_resolution_event (vnet_main_t * vnm,
678 uword type_opaque, uword data)
680 ethernet_arp_main_t *am = ðernet_arp_main;
681 ip4_address_t *address = address_arg;
683 pending_resolution_t *pr;
685 pool_get (am->pending_resolutions, pr);
688 pr->node_index = node_index;
689 pr->type_opaque = type_opaque;
691 pr->data_callback = 0;
693 p = hash_get (am->pending_resolutions_by_address, address->as_u32);
696 /* Insert new resolution at the head of the list */
697 pr->next_index = p[0];
698 hash_unset (am->pending_resolutions_by_address, address->as_u32);
701 hash_set (am->pending_resolutions_by_address, address->as_u32,
702 pr - am->pending_resolutions);
706 vnet_add_del_ip4_arp_change_event (vnet_main_t * vnm,
711 uword type_opaque, uword data, int is_add)
713 ethernet_arp_main_t *am = ðernet_arp_main;
714 ip4_address_t *address = address_arg;
716 /* Try to find an existing entry */
717 u32 *first = (u32 *) hash_get (am->mac_changes_by_address, address->as_u32);
719 pending_resolution_t *mc;
720 while (p && *p != ~0)
722 mc = pool_elt_at_index (am->mac_changes, *p);
723 if (mc->node_index == node_index && mc->type_opaque == type_opaque
729 int found = p && *p != ~0;
733 return VNET_API_ERROR_ENTRY_ALREADY_EXISTS;
735 pool_get (am->mac_changes, mc);
736 *mc = (pending_resolution_t)
738 .next_index = ~0,.node_index = node_index,.type_opaque =
739 type_opaque,.data = data,.data_callback = data_callback,.pid =
742 /* Insert new resolution at the end of the list */
743 u32 new_idx = mc - am->mac_changes;
747 hash_set (am->mac_changes_by_address, address->as_u32, new_idx);
752 return VNET_API_ERROR_NO_SUCH_ENTRY;
754 /* Clients may need to clean up pool entries, too */
755 void (*fp) (u32, u8 *) = data_callback;
757 (*fp) (mc->data, 0 /* no new mac addrs */ );
759 /* Remove the entry from the list and delete the entry */
761 pool_put (am->mac_changes, mc);
763 /* Remove from hash if we deleted the last entry */
764 if (*p == ~0 && p == first)
765 hash_unset (am->mac_changes_by_address, address->as_u32);
770 /* Either we drop the packet or we send a reply to the sender. */
774 ARP_INPUT_NEXT_REPLY_TX,
778 #define foreach_ethernet_arp_error \
779 _ (replies_sent, "ARP replies sent") \
780 _ (l2_type_not_ethernet, "L2 type not ethernet") \
781 _ (l3_type_not_ip4, "L3 type not IP4") \
782 _ (l3_src_address_not_local, "IP4 source address not local to subnet") \
783 _ (l3_dst_address_not_local, "IP4 destination address not local to subnet") \
784 _ (l3_src_address_is_local, "IP4 source address matches local interface") \
785 _ (l3_src_address_learned, "ARP request IP4 source address learned") \
786 _ (replies_received, "ARP replies received") \
787 _ (opcode_not_request, "ARP opcode not request") \
788 _ (proxy_arp_replies_sent, "Proxy ARP replies sent") \
789 _ (l2_address_mismatch, "ARP hw addr does not match L2 frame src addr") \
790 _ (gratuitous_arp, "ARP probe or announcement dropped") \
791 _ (interface_no_table, "Interface is not mapped to an IP table") \
792 _ (interface_not_ip_enabled, "Interface is not IP enabled") \
796 #define _(sym,string) ETHERNET_ARP_ERROR_##sym,
797 foreach_ethernet_arp_error
799 ETHERNET_ARP_N_ERROR,
800 } ethernet_arp_input_error_t;
804 unset_random_arp_entry (void)
806 ethernet_arp_main_t *am = ðernet_arp_main;
807 ethernet_arp_ip4_entry_t *e;
808 vnet_main_t *vnm = vnet_get_main ();
809 ethernet_arp_ip4_over_ethernet_address_t delme;
812 index = pool_next_index (am->ip4_entry_pool, am->arp_delete_rotor);
813 am->arp_delete_rotor = index;
815 /* Try again from elt 0, could happen if an intfc goes down */
818 index = pool_next_index (am->ip4_entry_pool, am->arp_delete_rotor);
819 am->arp_delete_rotor = index;
822 /* Nothing left in the pool */
826 e = pool_elt_at_index (am->ip4_entry_pool, index);
828 clib_memcpy (&delme.ethernet, e->ethernet_address, 6);
829 delme.ip4.as_u32 = e->ip4_address.as_u32;
831 vnet_arp_unset_ip4_over_ethernet (vnm, e->sw_if_index, &delme);
835 arp_unnumbered (vlib_buffer_t * p0,
836 u32 input_sw_if_index, u32 conn_sw_if_index)
838 vnet_main_t *vnm = vnet_get_main ();
839 vnet_interface_main_t *vim = &vnm->interface_main;
840 vnet_sw_interface_t *si;
842 /* verify that the input interface is unnumbered to the connected.
843 * the connected interface is the interface on which the subnet is
845 si = &vim->sw_interfaces[input_sw_if_index];
847 if (!(si->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED &&
848 (si->unnumbered_sw_if_index == conn_sw_if_index)))
850 /* the input interface is not unnumbered to the interface on which
851 * the sub-net is configured that covers the ARP request.
852 * So this is not the case for unnumbered.. */
860 arp_learn (vnet_main_t * vnm,
861 ethernet_arp_main_t * am, u32 sw_if_index, void *addr)
863 if (am->limit_arp_cache_size &&
864 pool_elts (am->ip4_entry_pool) >= am->limit_arp_cache_size)
865 unset_random_arp_entry ();
867 vnet_arp_set_ip4_over_ethernet (vnm, sw_if_index, addr, 0, 0);
868 return (ETHERNET_ARP_ERROR_l3_src_address_learned);
872 arp_input (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
874 ethernet_arp_main_t *am = ðernet_arp_main;
875 vnet_main_t *vnm = vnet_get_main ();
876 ip4_main_t *im4 = &ip4_main;
877 u32 n_left_from, next_index, *from, *to_next;
878 u32 n_replies_sent = 0, n_proxy_arp_replies_sent = 0;
880 from = vlib_frame_vector_args (frame);
881 n_left_from = frame->n_vectors;
882 next_index = node->cached_next_index;
884 if (node->flags & VLIB_NODE_FLAG_TRACE)
885 vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
887 sizeof (ethernet_arp_input_trace_t));
889 while (n_left_from > 0)
893 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
895 while (n_left_from > 0 && n_left_to_next > 0)
898 vnet_hw_interface_t *hw_if0;
899 ethernet_arp_header_t *arp0;
900 ethernet_header_t *eth_rx, *eth_tx;
901 ip4_address_t *if_addr0, proxy_src;
902 u32 pi0, error0, next0, sw_if_index0, conn_sw_if_index0, fib_index0;
903 u8 is_request0, dst_is_local0, is_unnum0, is_vrrp_reply0;
904 ethernet_proxy_arp_t *pa;
905 fib_node_index_t dst_fei, src_fei;
907 fib_entry_flag_t src_flags, dst_flags;
908 u8 *rewrite0, rewrite0_len;
918 p0 = vlib_get_buffer (vm, pi0);
919 arp0 = vlib_buffer_get_current (p0);
920 /* Fill in ethernet header. */
921 eth_rx = ethernet_buffer_get_header (p0);
923 is_request0 = arp0->opcode
924 == clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_request);
926 error0 = ETHERNET_ARP_ERROR_replies_sent;
930 clib_net_to_host_u16 (ETHERNET_ARP_HARDWARE_TYPE_ethernet) ?
931 ETHERNET_ARP_ERROR_l2_type_not_ethernet : error0);
934 clib_net_to_host_u16 (ETHERNET_TYPE_IP4) ?
935 ETHERNET_ARP_ERROR_l3_type_not_ip4 : error0);
937 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
939 /* not playing the ARP game if the interface is not IPv4 enabled */
941 (im4->ip_enabled_by_sw_if_index[sw_if_index0] == 0 ?
942 ETHERNET_ARP_ERROR_interface_not_ip_enabled : error0);
947 /* Check that IP address is local and matches incoming interface. */
948 fib_index0 = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);
949 if (~0 == fib_index0)
951 error0 = ETHERNET_ARP_ERROR_interface_no_table;
955 dst_fei = ip4_fib_table_lookup (ip4_fib_get (fib_index0),
956 &arp0->ip4_over_ethernet[1].ip4,
958 dst_flags = fib_entry_get_flags (dst_fei);
960 conn_sw_if_index0 = fib_entry_get_resolving_interface (dst_fei);
962 /* Honor unnumbered interface, if any */
963 is_unnum0 = sw_if_index0 != conn_sw_if_index0;
967 * we're looking for FIB entries that indicate the source
968 * is attached. There may be more specific non-attached
969 * routes tht match the source, but these do not influence
970 * whether we respond to an ARP request, i.e. they do not
971 * influence whether we are the correct way for the sender
972 * to reach us, they only affect how we reach the sender.
974 fib_entry_t *src_fib_entry;
975 fib_entry_src_t *src;
986 src_fei = ip4_fib_table_lookup (ip4_fib_get (fib_index0),
988 ip4_over_ethernet[0].ip4,
990 src_fib_entry = fib_entry_get (src_fei);
993 * It's possible that the source that provides the
994 * flags we need, or the flags we must not have,
995 * is not the best source, so check then all.
998 FOR_EACH_SRC_ADDED(src_fib_entry, src, source,
1000 src_flags = fib_entry_get_flags_for_source (src_fei, source);
1002 /* Reject requests/replies with our local interface
1004 if (FIB_ENTRY_FLAG_LOCAL & src_flags)
1006 error0 = ETHERNET_ARP_ERROR_l3_src_address_is_local;
1009 /* A Source must also be local to subnet of matching
1010 * interface address. */
1011 if ((FIB_ENTRY_FLAG_ATTACHED & src_flags) ||
1012 (FIB_ENTRY_FLAG_CONNECTED & src_flags))
1019 * The packet was sent from an address that is not
1020 * connected nor attached i.e. it is not from an
1021 * address that is covered by a link's sub-net,
1022 * nor is it a already learned host resp.
1028 * shorter mask lookup for the next iteration.
1030 fib_entry_get_prefix (src_fei, &pfx);
1031 mask = pfx.fp_len - 1;
1034 * continue until we hit the default route or we find
1035 * the attached we are looking for. The most likely
1036 * outcome is we find the attached with the first source
1037 * on the first lookup.
1041 !fib_entry_is_sourced (src_fei, FIB_SOURCE_DEFAULT_ROUTE));
1046 * the matching route is a not attached, i.e. it was
1047 * added as a result of routing, rather than interface/ARP
1048 * configuration. If the matching route is not a host route
1051 error0 = ETHERNET_ARP_ERROR_l3_src_address_not_local;
1056 if (!(FIB_ENTRY_FLAG_CONNECTED & dst_flags))
1058 error0 = ETHERNET_ARP_ERROR_l3_dst_address_not_local;
1062 if (sw_if_index0 != fib_entry_get_resolving_interface (src_fei))
1065 * The interface the ARP was received on is not the interface
1066 * on which the covering prefix is configured. Maybe this is a
1067 * case for unnumbered.
1072 dst_is_local0 = (FIB_ENTRY_FLAG_LOCAL & dst_flags);
1073 fib_entry_get_prefix (dst_fei, &pfx0);
1074 if_addr0 = &pfx0.fp_addr.ip4;
1078 clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply))
1081 (arp0->ip4_over_ethernet[0].ethernet, vrrp_prefix,
1082 sizeof (vrrp_prefix))));
1084 /* Trash ARP packets whose ARP-level source addresses do not
1085 match their L2-frame-level source addresses, unless it's
1086 a reply from a VRRP virtual router */
1088 (eth_rx->src_address, arp0->ip4_over_ethernet[0].ethernet,
1089 sizeof (eth_rx->src_address)) && !is_vrrp_reply0)
1091 error0 = ETHERNET_ARP_ERROR_l2_address_mismatch;
1095 /* Learn or update sender's mapping only for replies to addresses
1096 * that are local to the subnet */
1098 clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply) &&
1101 error0 = arp_learn (vnm, am, sw_if_index0,
1102 &arp0->ip4_over_ethernet[0]);
1108 An adjacency to the sender is not always present,
1109 so we use the interface to build us a rewrite string
1110 which will contain all the necessary tags. */
1111 rewrite0 = ethernet_build_rewrite (vnm, sw_if_index0,
1113 eth_rx->src_address);
1114 rewrite0_len = vec_len (rewrite0);
1116 /* Figure out how much to rewind current data from adjacency. */
1117 vlib_buffer_advance (p0, -rewrite0_len);
1118 eth_tx = vlib_buffer_get_current (p0);
1120 vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
1121 hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
1123 /* Send reply back through input interface */
1124 vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
1125 next0 = ARP_INPUT_NEXT_REPLY_TX;
1127 arp0->opcode = clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply);
1129 arp0->ip4_over_ethernet[1] = arp0->ip4_over_ethernet[0];
1131 clib_memcpy (arp0->ip4_over_ethernet[0].ethernet,
1132 hw_if0->hw_address, 6);
1133 clib_mem_unaligned (&arp0->ip4_over_ethernet[0].ip4.data_u32, u32) =
1136 /* Hardware must be ethernet-like. */
1137 ASSERT (vec_len (hw_if0->hw_address) == 6);
1139 /* the rx nd tx ethernet headers wil overlap in the case
1140 * when we received a tagged VLAN=0 packet, but we are sending
1142 clib_memcpy (eth_tx, rewrite0, vec_len (rewrite0));
1143 vec_free (rewrite0);
1149 if (!arp_unnumbered (p0, sw_if_index0, conn_sw_if_index0))
1154 /* We are going to reply to this request, so learn the sender */
1155 error0 = arp_learn (vnm, am, sw_if_index0,
1156 &arp0->ip4_over_ethernet[1]);
1158 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1159 n_left_to_next, pi0, next0);
1161 n_replies_sent += 1;
1165 if (0 == arp0->ip4_over_ethernet[0].ip4.as_u32 ||
1166 (arp0->ip4_over_ethernet[0].ip4.as_u32 ==
1167 arp0->ip4_over_ethernet[1].ip4.as_u32))
1169 error0 = ETHERNET_ARP_ERROR_gratuitous_arp;
1172 /* See if proxy arp is configured for the address */
1175 vnet_sw_interface_t *si;
1176 u32 this_addr = clib_net_to_host_u32
1177 (arp0->ip4_over_ethernet[1].ip4.as_u32);
1180 si = vnet_get_sw_interface (vnm, sw_if_index0);
1182 if (!(si->flags & VNET_SW_INTERFACE_FLAG_PROXY_ARP))
1185 fib_index0 = vec_elt (im4->fib_index_by_sw_if_index,
1188 vec_foreach (pa, am->proxy_arps)
1190 u32 lo_addr = clib_net_to_host_u32 (pa->lo_addr);
1191 u32 hi_addr = clib_net_to_host_u32 (pa->hi_addr);
1193 /* an ARP request hit in the proxy-arp table? */
1194 if ((this_addr >= lo_addr && this_addr <= hi_addr) &&
1195 (fib_index0 == pa->fib_index))
1198 arp0->ip4_over_ethernet[1].ip4.data_u32;
1201 * change the interface address to the proxied
1203 if_addr0 = &proxy_src;
1205 n_proxy_arp_replies_sent++;
1213 next0 = ARP_INPUT_NEXT_DROP;
1214 p0->error = node->errors[error0];
1216 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1217 n_left_to_next, pi0, next0);
1220 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1223 vlib_error_count (vm, node->node_index,
1224 ETHERNET_ARP_ERROR_replies_sent,
1225 n_replies_sent - n_proxy_arp_replies_sent);
1227 vlib_error_count (vm, node->node_index,
1228 ETHERNET_ARP_ERROR_proxy_arp_replies_sent,
1229 n_proxy_arp_replies_sent);
1230 return frame->n_vectors;
1233 static char *ethernet_arp_error_strings[] = {
1234 #define _(sym,string) string,
1235 foreach_ethernet_arp_error
1240 VLIB_REGISTER_NODE (arp_input_node, static) =
1242 .function = arp_input,
1243 .name = "arp-input",
1244 .vector_size = sizeof (u32),
1245 .n_errors = ETHERNET_ARP_N_ERROR,
1246 .error_strings = ethernet_arp_error_strings,
1247 .n_next_nodes = ARP_INPUT_N_NEXT,
1249 [ARP_INPUT_NEXT_DROP] = "error-drop",
1250 [ARP_INPUT_NEXT_REPLY_TX] = "interface-output",
1252 .format_buffer = format_ethernet_arp_header,
1253 .format_trace = format_ethernet_arp_input_trace,
1258 ip4_arp_entry_sort (void *a1, void *a2)
1260 ethernet_arp_ip4_entry_t *e1 = a1;
1261 ethernet_arp_ip4_entry_t *e2 = a2;
1264 vnet_main_t *vnm = vnet_get_main ();
1266 cmp = vnet_sw_interface_compare (vnm, e1->sw_if_index, e2->sw_if_index);
1268 cmp = ip4_address_compare (&e1->ip4_address, &e2->ip4_address);
1272 ethernet_arp_ip4_entry_t *
1273 ip4_neighbor_entries (u32 sw_if_index)
1275 ethernet_arp_main_t *am = ðernet_arp_main;
1276 ethernet_arp_ip4_entry_t *n, *ns = 0;
1279 pool_foreach (n, am->ip4_entry_pool, ({
1280 if (sw_if_index != ~0 && n->sw_if_index != sw_if_index)
1282 vec_add1 (ns, n[0]);
1287 vec_sort_with_function (ns, ip4_arp_entry_sort);
1291 static clib_error_t *
1292 show_ip4_arp (vlib_main_t * vm,
1293 unformat_input_t * input, vlib_cli_command_t * cmd)
1295 vnet_main_t *vnm = vnet_get_main ();
1296 ethernet_arp_main_t *am = ðernet_arp_main;
1297 ethernet_arp_ip4_entry_t *e, *es;
1298 ethernet_proxy_arp_t *pa;
1299 clib_error_t *error = 0;
1302 /* Filter entries by interface if given. */
1304 (void) unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index);
1306 es = ip4_neighbor_entries (sw_if_index);
1309 vlib_cli_output (vm, "%U", format_ethernet_arp_ip4_entry, vnm, 0);
1312 vlib_cli_output (vm, "%U", format_ethernet_arp_ip4_entry, vnm, e);
1317 if (vec_len (am->proxy_arps))
1319 vlib_cli_output (vm, "Proxy arps enabled for:");
1320 vec_foreach (pa, am->proxy_arps)
1322 vlib_cli_output (vm, "Fib_index %d %U - %U ",
1324 format_ip4_address, &pa->lo_addr,
1325 format_ip4_address, &pa->hi_addr);
1333 * Display all the IPv4 ARP entries.
1336 * Example of how to display the IPv4 ARP table:
1337 * @cliexstart{show ip arp}
1338 * Time FIB IP4 Flags Ethernet Interface
1339 * 346.3028 0 6.1.1.3 de:ad:be:ef:ba:be GigabitEthernet2/0/0
1340 * 3077.4271 0 6.1.1.4 S de:ad:be:ef:ff:ff GigabitEthernet2/0/0
1341 * 2998.6409 1 6.2.2.3 de:ad:be:ef:00:01 GigabitEthernet2/0/0
1342 * Proxy arps enabled for:
1343 * Fib_index 0 6.0.0.1 - 6.0.0.11
1347 VLIB_CLI_COMMAND (show_ip4_arp_command, static) = {
1348 .path = "show ip arp",
1349 .function = show_ip4_arp,
1350 .short_help = "show ip arp",
1356 pg_edit_t l2_type, l3_type;
1357 pg_edit_t n_l2_address_bytes, n_l3_address_bytes;
1363 } ip4_over_ethernet[2];
1364 } pg_ethernet_arp_header_t;
1367 pg_ethernet_arp_header_init (pg_ethernet_arp_header_t * p)
1369 /* Initialize fields that are not bit fields in the IP header. */
1370 #define _(f) pg_edit_init (&p->f, ethernet_arp_header_t, f);
1373 _(n_l2_address_bytes);
1374 _(n_l3_address_bytes);
1376 _(ip4_over_ethernet[0].ethernet);
1377 _(ip4_over_ethernet[0].ip4);
1378 _(ip4_over_ethernet[1].ethernet);
1379 _(ip4_over_ethernet[1].ip4);
1384 unformat_pg_arp_header (unformat_input_t * input, va_list * args)
1386 pg_stream_t *s = va_arg (*args, pg_stream_t *);
1387 pg_ethernet_arp_header_t *p;
1390 p = pg_create_edit_group (s, sizeof (p[0]), sizeof (ethernet_arp_header_t),
1392 pg_ethernet_arp_header_init (p);
1395 pg_edit_set_fixed (&p->l2_type, ETHERNET_ARP_HARDWARE_TYPE_ethernet);
1396 pg_edit_set_fixed (&p->l3_type, ETHERNET_TYPE_IP4);
1397 pg_edit_set_fixed (&p->n_l2_address_bytes, 6);
1398 pg_edit_set_fixed (&p->n_l3_address_bytes, 4);
1400 if (!unformat (input, "%U: %U/%U -> %U/%U",
1402 unformat_ethernet_arp_opcode_net_byte_order, &p->opcode,
1404 unformat_ethernet_address, &p->ip4_over_ethernet[0].ethernet,
1406 unformat_ip4_address, &p->ip4_over_ethernet[0].ip4,
1408 unformat_ethernet_address, &p->ip4_over_ethernet[1].ethernet,
1410 unformat_ip4_address, &p->ip4_over_ethernet[1].ip4))
1412 /* Free up any edits we may have added. */
1413 pg_free_edit_group (s);
1420 ip4_set_arp_limit (u32 arp_limit)
1422 ethernet_arp_main_t *am = ðernet_arp_main;
1424 am->limit_arp_cache_size = arp_limit;
1429 * @brief Control Plane hook to remove an ARP entry
1432 vnet_arp_unset_ip4_over_ethernet (vnet_main_t * vnm,
1433 u32 sw_if_index, void *a_arg)
1435 ethernet_arp_ip4_over_ethernet_address_t *a = a_arg;
1436 vnet_arp_set_ip4_over_ethernet_rpc_args_t args;
1438 args.sw_if_index = sw_if_index;
1439 args.flags = ETHERNET_ARP_ARGS_REMOVE;
1440 clib_memcpy (&args.a, a, sizeof (*a));
1442 vl_api_rpc_call_main_thread (set_ip4_over_ethernet_rpc_callback,
1443 (u8 *) & args, sizeof (args));
1448 * @brief Internally generated event to flush the ARP cache on an
1449 * interface state change event.
1450 * A flush will remove dynamic ARP entries, and for statics remove the MAC
1451 * address from the corresponding adjacencies.
1454 vnet_arp_flush_ip4_over_ethernet (vnet_main_t * vnm,
1455 u32 sw_if_index, void *a_arg)
1457 ethernet_arp_ip4_over_ethernet_address_t *a = a_arg;
1458 vnet_arp_set_ip4_over_ethernet_rpc_args_t args;
1460 args.sw_if_index = sw_if_index;
1461 args.flags = ETHERNET_ARP_ARGS_FLUSH;
1462 clib_memcpy (&args.a, a, sizeof (*a));
1464 vl_api_rpc_call_main_thread (set_ip4_over_ethernet_rpc_callback,
1465 (u8 *) & args, sizeof (args));
1470 * @brief Internally generated event to populate the ARP cache on an
1471 * interface state change event.
1472 * For static entries this will re-source the adjacencies.
1474 * @param sw_if_index The interface on which the ARP entires are acted
1477 vnet_arp_populate_ip4_over_ethernet (vnet_main_t * vnm,
1478 u32 sw_if_index, void *a_arg)
1480 ethernet_arp_ip4_over_ethernet_address_t *a = a_arg;
1481 vnet_arp_set_ip4_over_ethernet_rpc_args_t args;
1483 args.sw_if_index = sw_if_index;
1484 args.flags = ETHERNET_ARP_ARGS_POPULATE;
1485 clib_memcpy (&args.a, a, sizeof (*a));
1487 vl_api_rpc_call_main_thread (set_ip4_over_ethernet_rpc_callback,
1488 (u8 *) & args, sizeof (args));
1493 * arp_add_del_interface_address
1495 * callback when an interface address is added or deleted
1498 arp_add_del_interface_address (ip4_main_t * im,
1501 ip4_address_t * address,
1503 u32 if_address_index, u32 is_del)
1506 * Flush the ARP cache of all entries covered by the address
1507 * that is being removed.
1509 ethernet_arp_main_t *am = ðernet_arp_main;
1510 ethernet_arp_ip4_entry_t *e;
1512 if (vec_len (am->ethernet_arp_by_sw_if_index) <= sw_if_index)
1517 ethernet_arp_interface_t *eai;
1518 u32 i, *to_delete = 0;
1521 eai = &am->ethernet_arp_by_sw_if_index[sw_if_index];
1524 hash_foreach_pair (pair, eai->arp_entries,
1526 e = pool_elt_at_index(am->ip4_entry_pool,
1528 if (ip4_destination_matches_route (im, &e->ip4_address,
1529 address, address_length))
1531 vec_add1 (to_delete, e - am->ip4_entry_pool);
1536 for (i = 0; i < vec_len (to_delete); i++)
1538 ethernet_arp_ip4_over_ethernet_address_t delme;
1539 e = pool_elt_at_index (am->ip4_entry_pool, to_delete[i]);
1541 clib_memcpy (&delme.ethernet, e->ethernet_address, 6);
1542 delme.ip4.as_u32 = e->ip4_address.as_u32;
1544 vnet_arp_flush_ip4_over_ethernet (vnet_get_main (),
1545 e->sw_if_index, &delme);
1548 vec_free (to_delete);
1552 static clib_error_t *
1553 ethernet_arp_init (vlib_main_t * vm)
1555 ethernet_arp_main_t *am = ðernet_arp_main;
1556 ip4_main_t *im = &ip4_main;
1557 clib_error_t *error;
1560 if ((error = vlib_call_init_function (vm, ethernet_init)))
1563 ethernet_register_input_type (vm, ETHERNET_TYPE_ARP, arp_input_node.index);
1565 pn = pg_get_node (arp_input_node.index);
1566 pn->unformat_edit = unformat_pg_arp_header;
1568 am->opcode_by_name = hash_create_string (0, sizeof (uword));
1569 #define _(o) hash_set_mem (am->opcode_by_name, #o, ETHERNET_ARP_OPCODE_##o);
1570 foreach_ethernet_arp_opcode;
1573 /* $$$ configurable */
1574 am->limit_arp_cache_size = 50000;
1576 am->pending_resolutions_by_address = hash_create (0, sizeof (uword));
1577 am->mac_changes_by_address = hash_create (0, sizeof (uword));
1579 /* don't trace ARP error packets */
1581 vlib_node_runtime_t *rt =
1582 vlib_node_get_runtime (vm, arp_input_node.index);
1585 vnet_pcap_drop_trace_filter_add_del \
1586 (rt->errors[ETHERNET_ARP_ERROR_##a], \
1588 foreach_ethernet_arp_error
1592 ip4_add_del_interface_address_callback_t cb;
1593 cb.function = arp_add_del_interface_address;
1594 cb.function_opaque = 0;
1595 vec_add1 (im->add_del_interface_address_callbacks, cb);
1600 VLIB_INIT_FUNCTION (ethernet_arp_init);
1603 arp_entry_free (ethernet_arp_interface_t * eai, ethernet_arp_ip4_entry_t * e)
1605 ethernet_arp_main_t *am = ðernet_arp_main;
1607 if (FIB_NODE_INDEX_INVALID != e->fib_entry_index)
1609 fib_prefix_t pfx = {
1611 .fp_proto = FIB_PROTOCOL_IP4,
1612 .fp_addr.ip4 = e->ip4_address,
1616 fib_index = ip4_fib_table_get_index_for_sw_if_index (e->sw_if_index);
1618 fib_table_entry_path_remove (fib_index, &pfx,
1622 e->sw_if_index, ~0, 1,
1623 FIB_ROUTE_PATH_FLAG_NONE);
1625 hash_unset (eai->arp_entries, e->ip4_address.as_u32);
1626 pool_put (am->ip4_entry_pool, e);
1630 vnet_arp_unset_ip4_over_ethernet_internal (vnet_main_t * vnm,
1631 vnet_arp_set_ip4_over_ethernet_rpc_args_t
1634 ethernet_arp_main_t *am = ðernet_arp_main;
1635 ethernet_arp_ip4_entry_t *e;
1636 ethernet_arp_interface_t *eai;
1638 if (vec_len (am->ethernet_arp_by_sw_if_index) <= args->sw_if_index)
1641 eai = &am->ethernet_arp_by_sw_if_index[args->sw_if_index];
1643 e = arp_entry_find (eai, &args->a.ip4);
1647 arp_entry_free (eai, e);
1649 adj_nbr_walk_nh4 (e->sw_if_index,
1650 &e->ip4_address, arp_mk_incomplete_walk, NULL);
1657 vnet_arp_flush_ip4_over_ethernet_internal (vnet_main_t * vnm,
1658 vnet_arp_set_ip4_over_ethernet_rpc_args_t
1661 ethernet_arp_main_t *am = ðernet_arp_main;
1662 ethernet_arp_ip4_entry_t *e;
1663 ethernet_arp_interface_t *eai;
1665 if (vec_len (am->ethernet_arp_by_sw_if_index) <= args->sw_if_index)
1668 eai = &am->ethernet_arp_by_sw_if_index[args->sw_if_index];
1670 e = arp_entry_find (eai, &args->a.ip4);
1674 adj_nbr_walk_nh4 (e->sw_if_index,
1675 &e->ip4_address, arp_mk_incomplete_walk, e);
1678 * The difference between flush and unset, is that an unset
1679 * means delete for static and dynamic entries. A flush
1680 * means delete only for dynamic. Flushing is what the DP
1681 * does in response to interface events. unset is only done
1682 * by the control plane.
1684 if (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_DYNAMIC)
1686 arp_entry_free (eai, e);
1693 vnet_arp_populate_ip4_over_ethernet_internal (vnet_main_t * vnm,
1694 vnet_arp_set_ip4_over_ethernet_rpc_args_t
1697 ethernet_arp_main_t *am = ðernet_arp_main;
1698 ethernet_arp_ip4_entry_t *e;
1699 ethernet_arp_interface_t *eai;
1701 vec_validate (am->ethernet_arp_by_sw_if_index, args->sw_if_index);
1702 eai = &am->ethernet_arp_by_sw_if_index[args->sw_if_index];
1704 e = arp_entry_find (eai, &args->a.ip4);
1708 adj_nbr_walk_nh4 (e->sw_if_index,
1709 &e->ip4_address, arp_mk_complete_walk, e);
1715 set_ip4_over_ethernet_rpc_callback (vnet_arp_set_ip4_over_ethernet_rpc_args_t
1718 vnet_main_t *vm = vnet_get_main ();
1719 ASSERT (vlib_get_thread_index () == 0);
1721 if (a->flags & ETHERNET_ARP_ARGS_REMOVE)
1722 vnet_arp_unset_ip4_over_ethernet_internal (vm, a);
1723 else if (a->flags & ETHERNET_ARP_ARGS_FLUSH)
1724 vnet_arp_flush_ip4_over_ethernet_internal (vm, a);
1725 else if (a->flags & ETHERNET_ARP_ARGS_POPULATE)
1726 vnet_arp_populate_ip4_over_ethernet_internal (vm, a);
1728 vnet_arp_set_ip4_over_ethernet_internal (vm, a);
1732 * @brief Invoked when the interface's admin state changes
1734 static clib_error_t *
1735 ethernet_arp_sw_interface_up_down (vnet_main_t * vnm,
1736 u32 sw_if_index, u32 flags)
1738 ethernet_arp_main_t *am = ðernet_arp_main;
1739 ethernet_arp_ip4_entry_t *e;
1740 u32 i, *to_delete = 0;
1743 pool_foreach (e, am->ip4_entry_pool,
1745 if (e->sw_if_index == sw_if_index)
1746 vec_add1 (to_delete,
1747 e - am->ip4_entry_pool);
1751 for (i = 0; i < vec_len (to_delete); i++)
1753 ethernet_arp_ip4_over_ethernet_address_t delme;
1754 e = pool_elt_at_index (am->ip4_entry_pool, to_delete[i]);
1756 clib_memcpy (&delme.ethernet, e->ethernet_address, 6);
1757 delme.ip4.as_u32 = e->ip4_address.as_u32;
1759 if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
1761 vnet_arp_populate_ip4_over_ethernet (vnm, e->sw_if_index, &delme);
1765 vnet_arp_flush_ip4_over_ethernet (vnm, e->sw_if_index, &delme);
1769 vec_free (to_delete);
1774 VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (ethernet_arp_sw_interface_up_down);
1777 increment_ip4_and_mac_address (ethernet_arp_ip4_over_ethernet_address_t * a)
1782 for (i = 3; i >= 0; i--)
1784 old = a->ip4.as_u8[i];
1785 a->ip4.as_u8[i] += 1;
1786 if (old < a->ip4.as_u8[i])
1790 for (i = 5; i >= 0; i--)
1792 old = a->ethernet[i];
1793 a->ethernet[i] += 1;
1794 if (old < a->ethernet[i])
1800 vnet_arp_set_ip4_over_ethernet (vnet_main_t * vnm,
1801 u32 sw_if_index, void *a_arg,
1802 int is_static, int is_no_fib_entry)
1804 ethernet_arp_ip4_over_ethernet_address_t *a = a_arg;
1805 vnet_arp_set_ip4_over_ethernet_rpc_args_t args;
1807 args.sw_if_index = sw_if_index;
1808 args.is_static = is_static;
1809 args.is_no_fib_entry = is_no_fib_entry;
1811 clib_memcpy (&args.a, a, sizeof (*a));
1813 vl_api_rpc_call_main_thread (set_ip4_over_ethernet_rpc_callback,
1814 (u8 *) & args, sizeof (args));
1819 vnet_proxy_arp_add_del (ip4_address_t * lo_addr,
1820 ip4_address_t * hi_addr, u32 fib_index, int is_del)
1822 ethernet_arp_main_t *am = ðernet_arp_main;
1823 ethernet_proxy_arp_t *pa;
1824 u32 found_at_index = ~0;
1826 vec_foreach (pa, am->proxy_arps)
1828 if (pa->lo_addr == lo_addr->as_u32
1829 && pa->hi_addr == hi_addr->as_u32 && pa->fib_index == fib_index)
1831 found_at_index = pa - am->proxy_arps;
1836 if (found_at_index != ~0)
1838 /* Delete, otherwise it's already in the table */
1840 vec_delete (am->proxy_arps, 1, found_at_index);
1843 /* delete, no such entry */
1845 return VNET_API_ERROR_NO_SUCH_ENTRY;
1847 /* add, not in table */
1848 vec_add2 (am->proxy_arps, pa, 1);
1849 pa->lo_addr = lo_addr->as_u32;
1850 pa->hi_addr = hi_addr->as_u32;
1851 pa->fib_index = fib_index;
1856 * Remove any proxy arp entries asdociated with the
1860 vnet_proxy_arp_fib_reset (u32 fib_id)
1862 ethernet_arp_main_t *am = ðernet_arp_main;
1863 ethernet_proxy_arp_t *pa;
1864 u32 *entries_to_delete = 0;
1868 fib_index = fib_table_find (FIB_PROTOCOL_IP4, fib_id);
1869 if (~0 == fib_index)
1870 return VNET_API_ERROR_NO_SUCH_ENTRY;
1872 vec_foreach (pa, am->proxy_arps)
1874 if (pa->fib_index == fib_index)
1876 vec_add1 (entries_to_delete, pa - am->proxy_arps);
1880 for (i = 0; i < vec_len (entries_to_delete); i++)
1882 vec_delete (am->proxy_arps, 1, entries_to_delete[i]);
1885 vec_free (entries_to_delete);
1890 static clib_error_t *
1891 ip_arp_add_del_command_fn (vlib_main_t * vm,
1892 unformat_input_t * input, vlib_cli_command_t * cmd)
1894 vnet_main_t *vnm = vnet_get_main ();
1896 ethernet_arp_ip4_over_ethernet_address_t lo_addr, hi_addr, addr;
1903 int is_no_fib_entry = 0;
1906 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
1908 /* set ip arp TenGigE1/1/0/1 1.2.3.4 aa:bb:... or aabb.ccdd... */
1909 if (unformat (input, "%U %U %U",
1910 unformat_vnet_sw_interface, vnm, &sw_if_index,
1911 unformat_ip4_address, &addr.ip4,
1912 unformat_ethernet_address, &addr.ethernet))
1915 else if (unformat (input, "delete") || unformat (input, "del"))
1918 else if (unformat (input, "static"))
1921 else if (unformat (input, "no-fib-entry"))
1922 is_no_fib_entry = 1;
1924 else if (unformat (input, "count %d", &count))
1927 else if (unformat (input, "fib-id %d", &fib_id))
1929 fib_index = fib_table_find (FIB_PROTOCOL_IP4, fib_id);
1931 if (~0 == fib_index)
1932 return clib_error_return (0, "fib ID %d doesn't exist\n", fib_id);
1935 else if (unformat (input, "proxy %U - %U",
1936 unformat_ip4_address, &lo_addr.ip4,
1937 unformat_ip4_address, &hi_addr.ip4))
1945 (void) vnet_proxy_arp_add_del (&lo_addr.ip4, &hi_addr.ip4,
1954 for (i = 0; i < count; i++)
1958 uword event_type, *event_data = 0;
1960 /* Park the debug CLI until the arp entry is installed */
1961 vnet_register_ip4_arp_resolution_event
1962 (vnm, &addr.ip4, vlib_current_process (vm),
1963 1 /* type */ , 0 /* data */ );
1965 vnet_arp_set_ip4_over_ethernet
1966 (vnm, sw_if_index, &addr, is_static, is_no_fib_entry);
1968 vlib_process_wait_for_event (vm);
1969 event_type = vlib_process_get_events (vm, &event_data);
1970 vec_reset_length (event_data);
1971 if (event_type != 1)
1972 clib_warning ("event type %d unexpected", event_type);
1975 vnet_arp_unset_ip4_over_ethernet (vnm, sw_if_index, &addr);
1977 increment_ip4_and_mac_address (&addr);
1982 return clib_error_return (0, "unknown input `%U'",
1983 format_unformat_error, input);
1991 * Add or delete IPv4 ARP cache entries.
1993 * @note 'set ip arp' options (e.g. delete, static, 'fib-id <id>',
1994 * 'count <number>', 'interface ip4_addr mac_addr') can be added in
1995 * any order and combination.
1999 * Add or delete IPv4 ARP cache entries as follows. MAC Address can be in
2000 * either aa:bb:cc:dd:ee:ff format or aabb.ccdd.eeff format.
2001 * @cliexcmd{set ip arp GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2002 * @cliexcmd{set ip arp delete GigabitEthernet2/0/0 6.0.0.3 de:ad:be:ef:ba:be}
2004 * To add or delete an IPv4 ARP cache entry to or from a specific fib
2006 * @cliexcmd{set ip arp fib-id 1 GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2007 * @cliexcmd{set ip arp fib-id 1 delete GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2009 * Add or delete IPv4 static ARP cache entries as follows:
2010 * @cliexcmd{set ip arp static GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2011 * @cliexcmd{set ip arp static delete GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2013 * For testing / debugging purposes, the 'set ip arp' command can add or
2014 * delete multiple entries. Supply the 'count N' parameter:
2015 * @cliexcmd{set ip arp count 10 GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2018 VLIB_CLI_COMMAND (ip_arp_add_del_command, static) = {
2019 .path = "set ip arp",
2021 "set ip arp [del] <intfc> <ip-address> <mac-address> [static] [no-fib-entry] [count <count>] [fib-id <fib-id>] [proxy <lo-addr> - <hi-addr>]",
2022 .function = ip_arp_add_del_command_fn,
2026 static clib_error_t *
2027 set_int_proxy_arp_command_fn (vlib_main_t * vm,
2029 input, vlib_cli_command_t * cmd)
2031 vnet_main_t *vnm = vnet_get_main ();
2033 vnet_sw_interface_t *si;
2037 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2039 if (unformat (input, "%U", unformat_vnet_sw_interface,
2042 else if (unformat (input, "enable") || unformat (input, "on"))
2044 else if (unformat (input, "disable") || unformat (input, "off"))
2051 return clib_error_return (0, "unknown input '%U'",
2052 format_unformat_error, input);
2054 si = vnet_get_sw_interface (vnm, sw_if_index);
2057 si->flags |= VNET_SW_INTERFACE_FLAG_PROXY_ARP;
2059 si->flags &= ~VNET_SW_INTERFACE_FLAG_PROXY_ARP;
2066 * Enable proxy-arp on an interface. The vpp stack will answer ARP
2067 * requests for the indicated address range. Multiple proxy-arp
2068 * ranges may be provisioned.
2070 * @note Proxy ARP as a technology is infamous for blackholing traffic.
2071 * Also, the underlying implementation has not been performance-tuned.
2072 * Avoid creating an unnecessarily large set of ranges.
2075 * To enable proxy arp on a range of addresses, use:
2076 * @cliexcmd{set ip arp proxy 6.0.0.1 - 6.0.0.11}
2077 * Append 'del' to delete a range of proxy ARP addresses:
2078 * @cliexcmd{set ip arp proxy 6.0.0.1 - 6.0.0.11 del}
2079 * You must then specifically enable proxy arp on individual interfaces:
2080 * @cliexcmd{set interface proxy-arp GigabitEthernet0/8/0 enable}
2081 * To disable proxy arp on an individual interface:
2082 * @cliexcmd{set interface proxy-arp GigabitEthernet0/8/0 disable}
2084 VLIB_CLI_COMMAND (set_int_proxy_enable_command, static) = {
2085 .path = "set interface proxy-arp",
2087 "set interface proxy-arp <intfc> [enable|disable]",
2088 .function = set_int_proxy_arp_command_fn,
2094 * ARP/ND Termination in a L2 Bridge Domain based on IP4/IP6 to MAC
2095 * hash tables mac_by_ip4 and mac_by_ip6 for each BD.
2099 ARP_TERM_NEXT_L2_OUTPUT,
2104 u32 arp_term_next_node_index[32];
2107 arp_term_l2bd (vlib_main_t * vm,
2108 vlib_node_runtime_t * node, vlib_frame_t * frame)
2110 l2input_main_t *l2im = &l2input_main;
2111 u32 n_left_from, next_index, *from, *to_next;
2112 u32 n_replies_sent = 0;
2113 u16 last_bd_index = ~0;
2114 l2_bridge_domain_t *last_bd_config = 0;
2115 l2_input_config_t *cfg0;
2117 from = vlib_frame_vector_args (frame);
2118 n_left_from = frame->n_vectors;
2119 next_index = node->cached_next_index;
2121 while (n_left_from > 0)
2125 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2127 while (n_left_from > 0 && n_left_to_next > 0)
2130 ethernet_header_t *eth0;
2131 ethernet_arp_header_t *arp0;
2134 u32 pi0, error0, next0, sw_if_index0;
2146 n_left_to_next -= 1;
2148 p0 = vlib_get_buffer (vm, pi0);
2149 // Terminate only local (SHG == 0) ARP
2150 if (vnet_buffer (p0)->l2.shg != 0)
2151 goto next_l2_feature;
2153 eth0 = vlib_buffer_get_current (p0);
2154 l3h0 = (u8 *) eth0 + vnet_buffer (p0)->l2.l2_len;
2155 ethertype0 = clib_net_to_host_u16 (*(u16 *) (l3h0 - 2));
2156 arp0 = (ethernet_arp_header_t *) l3h0;
2158 if (PREDICT_FALSE ((ethertype0 != ETHERNET_TYPE_ARP) ||
2160 clib_host_to_net_u16
2161 (ETHERNET_ARP_OPCODE_request))))
2164 /* Must be ARP request packet here */
2165 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) &&
2166 (p0->flags & VLIB_BUFFER_IS_TRACED)))
2168 u8 *t0 = vlib_add_trace (vm, node, p0,
2169 sizeof (ethernet_arp_input_trace_t));
2170 clib_memcpy (t0, l3h0, sizeof (ethernet_arp_input_trace_t));
2173 error0 = ETHERNET_ARP_ERROR_replies_sent;
2176 clib_net_to_host_u16 (ETHERNET_ARP_HARDWARE_TYPE_ethernet)
2177 ? ETHERNET_ARP_ERROR_l2_type_not_ethernet : error0);
2180 clib_net_to_host_u16 (ETHERNET_TYPE_IP4) ?
2181 ETHERNET_ARP_ERROR_l3_type_not_ip4 : error0);
2183 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
2190 clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply))
2193 (arp0->ip4_over_ethernet[0].ethernet, vrrp_prefix,
2194 sizeof (vrrp_prefix))));
2196 /* Trash ARP packets whose ARP-level source addresses do not
2197 match their L2-frame-level source addresses, unless it's
2198 a reply from a VRRP virtual router */
2200 (memcmp (eth0->src_address, arp0->ip4_over_ethernet[0].ethernet,
2201 sizeof (eth0->src_address)) && !is_vrrp_reply0))
2203 error0 = ETHERNET_ARP_ERROR_l2_address_mismatch;
2207 /* Check if anyone want ARP request events for L2 BDs */
2209 pending_resolution_t *mc;
2210 ethernet_arp_main_t *am = ðernet_arp_main;
2211 uword *p = hash_get (am->mac_changes_by_address, 0);
2214 u32 next_index = p[0];
2215 while (next_index != (u32) ~ 0)
2217 int (*fp) (u32, u8 *, u32, u32);
2219 mc = pool_elt_at_index (am->mac_changes, next_index);
2220 fp = mc->data_callback;
2221 /* Call the callback, return 1 to suppress dup events */
2223 rv = (*fp) (mc->data,
2224 arp0->ip4_over_ethernet[0].ethernet,
2226 arp0->ip4_over_ethernet[0].ip4.as_u32);
2227 /* Signal the resolver process */
2229 vlib_process_signal_event (vm, mc->node_index,
2230 mc->type_opaque, mc->data);
2231 next_index = mc->next_index;
2236 /* lookup BD mac_by_ip4 hash table for MAC entry */
2237 ip0 = arp0->ip4_over_ethernet[1].ip4.as_u32;
2238 bd_index0 = vnet_buffer (p0)->l2.bd_index;
2239 if (PREDICT_FALSE ((bd_index0 != last_bd_index)
2240 || (last_bd_index == (u16) ~ 0)))
2242 last_bd_index = bd_index0;
2243 last_bd_config = vec_elt_at_index (l2im->bd_configs, bd_index0);
2245 macp0 = (u8 *) hash_get (last_bd_config->mac_by_ip4, ip0);
2247 if (PREDICT_FALSE (!macp0))
2248 goto next_l2_feature; /* MAC not found */
2250 /* MAC found, send ARP reply -
2251 Convert ARP request packet to ARP reply */
2252 arp0->opcode = clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply);
2253 arp0->ip4_over_ethernet[1] = arp0->ip4_over_ethernet[0];
2254 arp0->ip4_over_ethernet[0].ip4.as_u32 = ip0;
2255 clib_memcpy (arp0->ip4_over_ethernet[0].ethernet, macp0, 6);
2256 clib_memcpy (eth0->dst_address, eth0->src_address, 6);
2257 clib_memcpy (eth0->src_address, macp0, 6);
2258 n_replies_sent += 1;
2261 /* For BVI, need to use l2-fwd node to send ARP reply as
2262 l2-output node cannot output packet to BVI properly */
2263 cfg0 = vec_elt_at_index (l2im->configs, sw_if_index0);
2264 if (PREDICT_FALSE (cfg0->bvi))
2266 vnet_buffer (p0)->l2.feature_bitmap |= L2INPUT_FEAT_FWD;
2267 vnet_buffer (p0)->sw_if_index[VLIB_RX] = 0;
2268 goto next_l2_feature;
2271 /* Send ARP/ND reply back out input interface through l2-output */
2272 vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
2273 next0 = ARP_TERM_NEXT_L2_OUTPUT;
2274 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2275 to_next, n_left_to_next, pi0,
2280 /* IP6 ND event notification or solicitation handling to generate
2281 local response instead of flooding */
2282 iph0 = (ip6_header_t *) l3h0;
2283 if (PREDICT_FALSE (ethertype0 == ETHERNET_TYPE_IP6 &&
2284 iph0->protocol == IP_PROTOCOL_ICMP6 &&
2285 !ip6_address_is_unspecified
2286 (&iph0->src_address)))
2288 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
2289 if (vnet_ip6_nd_term
2290 (vm, node, p0, eth0, iph0, sw_if_index0,
2291 vnet_buffer (p0)->l2.bd_index))
2292 goto output_response;
2297 next0 = vnet_l2_feature_next (p0, arp_term_next_node_index,
2298 L2INPUT_FEAT_ARP_TERM);
2299 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2300 to_next, n_left_to_next,
2306 if (0 == arp0->ip4_over_ethernet[0].ip4.as_u32 ||
2307 (arp0->ip4_over_ethernet[0].ip4.as_u32 ==
2308 arp0->ip4_over_ethernet[1].ip4.as_u32))
2310 error0 = ETHERNET_ARP_ERROR_gratuitous_arp;
2312 next0 = ARP_TERM_NEXT_DROP;
2313 p0->error = node->errors[error0];
2315 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2316 to_next, n_left_to_next, pi0,
2320 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2323 vlib_error_count (vm, node->node_index,
2324 ETHERNET_ARP_ERROR_replies_sent, n_replies_sent);
2325 return frame->n_vectors;
2329 VLIB_REGISTER_NODE (arp_term_l2bd_node, static) = {
2330 .function = arp_term_l2bd,
2331 .name = "arp-term-l2bd",
2332 .vector_size = sizeof (u32),
2333 .n_errors = ETHERNET_ARP_N_ERROR,
2334 .error_strings = ethernet_arp_error_strings,
2335 .n_next_nodes = ARP_TERM_N_NEXT,
2337 [ARP_TERM_NEXT_L2_OUTPUT] = "l2-output",
2338 [ARP_TERM_NEXT_DROP] = "error-drop",
2340 .format_buffer = format_ethernet_arp_header,
2341 .format_trace = format_arp_term_input_trace,
2346 arp_term_init (vlib_main_t * vm)
2348 // Initialize the feature next-node indexes
2349 feat_bitmap_init_next_nodes (vm,
2350 arp_term_l2bd_node.index,
2352 l2input_get_feat_names (),
2353 arp_term_next_node_index);
2357 VLIB_INIT_FUNCTION (arp_term_init);
2360 change_arp_mac (u32 sw_if_index, ethernet_arp_ip4_entry_t * e)
2362 if (e->sw_if_index == sw_if_index)
2364 adj_nbr_walk_nh4 (e->sw_if_index,
2365 &e->ip4_address, arp_mk_complete_walk, e);
2370 ethernet_arp_change_mac (u32 sw_if_index)
2372 ethernet_arp_main_t *am = ðernet_arp_main;
2373 ethernet_arp_ip4_entry_t *e;
2376 pool_foreach (e, am->ip4_entry_pool,
2378 change_arp_mac (sw_if_index, e);
2384 send_ip4_garp (vlib_main_t * vm, vnet_hw_interface_t * hi)
2386 ip4_main_t *i4m = &ip4_main;
2387 u32 sw_if_index = hi->sw_if_index;
2388 ip4_address_t *ip4_addr = ip4_interface_first_address (i4m, sw_if_index, 0);
2392 clib_warning ("Sending GARP for IP4 address %U on sw_if_idex %d",
2393 format_ip4_address, ip4_addr, sw_if_index);
2395 /* Form GARP packet for output - Gratuitous ARP is an ARP request packet
2396 where the interface IP/MAC pair is used for both source and request
2397 MAC/IP pairs in the request */
2399 ethernet_arp_header_t *h = vlib_packet_template_get_packet
2400 (vm, &i4m->ip4_arp_request_packet_template, &bi);
2401 clib_memcpy (h->ip4_over_ethernet[0].ethernet, hi->hw_address,
2402 sizeof (h->ip4_over_ethernet[0].ethernet));
2403 clib_memcpy (h->ip4_over_ethernet[1].ethernet, hi->hw_address,
2404 sizeof (h->ip4_over_ethernet[1].ethernet));
2405 h->ip4_over_ethernet[0].ip4 = ip4_addr[0];
2406 h->ip4_over_ethernet[1].ip4 = ip4_addr[0];
2408 /* Setup MAC header with ARP Etype and broadcast DMAC */
2409 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
2410 vlib_buffer_advance (b, -sizeof (ethernet_header_t));
2411 ethernet_header_t *e = vlib_buffer_get_current (b);
2412 e->type = clib_host_to_net_u16 (ETHERNET_TYPE_ARP);
2413 clib_memcpy (e->src_address, hi->hw_address, sizeof (e->src_address));
2414 memset (e->dst_address, 0xff, sizeof (e->dst_address));
2416 /* Send GARP packet out the specified interface */
2417 vnet_buffer (b)->sw_if_index[VLIB_RX] =
2418 vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index;
2419 vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index);
2420 u32 *to_next = vlib_frame_vector_args (f);
2423 vlib_put_frame_to_node (vm, hi->output_node_index, f);
2427 static vlib_node_registration_t send_garp_na_proc_node;
2430 send_garp_na_process (vlib_main_t * vm,
2431 vlib_node_runtime_t * rt, vlib_frame_t * f)
2433 vnet_main_t *vnm = vnet_get_main ();
2434 uword event_type, *event_data = 0;
2436 send_garp_na_process_node_index = send_garp_na_proc_node.index;
2440 vlib_process_wait_for_event (vm);
2441 event_type = vlib_process_get_events (vm, &event_data);
2442 if ((event_type == SEND_GARP_NA) && (vec_len (event_data) >= 1))
2444 u32 hw_if_index = event_data[0];
2445 vnet_hw_interface_t *hi = vnet_get_hw_interface (vnm, hw_if_index);
2446 send_ip4_garp (vm, hi);
2447 send_ip6_na (vm, hi);
2449 vec_reset_length (event_data);
2456 VLIB_REGISTER_NODE (send_garp_na_proc_node, static) = {
2457 .function = send_garp_na_process,
2458 .type = VLIB_NODE_TYPE_PROCESS,
2459 .name = "send-garp-na-process",
2464 * fd.io coding-style-patch-verification: ON
2467 * eval: (c-set-style "gnu")