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%=24U",
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 FIB_PROTOCOL_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 _ (missing_interface_address, "ARP missing interface address") \
791 _ (gratuitous_arp, "ARP probe or announcement dropped") \
792 _ (interface_no_table, "Interface is not mapped to an IP table") \
793 _ (interface_not_ip_enabled, "Interface is not IP enabled") \
797 #define _(sym,string) ETHERNET_ARP_ERROR_##sym,
798 foreach_ethernet_arp_error
800 ETHERNET_ARP_N_ERROR,
801 } ethernet_arp_input_error_t;
805 unset_random_arp_entry (void)
807 ethernet_arp_main_t *am = ðernet_arp_main;
808 ethernet_arp_ip4_entry_t *e;
809 vnet_main_t *vnm = vnet_get_main ();
810 ethernet_arp_ip4_over_ethernet_address_t delme;
813 index = pool_next_index (am->ip4_entry_pool, am->arp_delete_rotor);
814 am->arp_delete_rotor = index;
816 /* Try again from elt 0, could happen if an intfc goes down */
819 index = pool_next_index (am->ip4_entry_pool, am->arp_delete_rotor);
820 am->arp_delete_rotor = index;
823 /* Nothing left in the pool */
827 e = pool_elt_at_index (am->ip4_entry_pool, index);
829 clib_memcpy (&delme.ethernet, e->ethernet_address, 6);
830 delme.ip4.as_u32 = e->ip4_address.as_u32;
832 vnet_arp_unset_ip4_over_ethernet (vnm, e->sw_if_index, &delme);
836 arp_unnumbered (vlib_buffer_t * p0,
837 u32 input_sw_if_index, u32 conn_sw_if_index)
839 vnet_main_t *vnm = vnet_get_main ();
840 vnet_interface_main_t *vim = &vnm->interface_main;
841 vnet_sw_interface_t *si;
843 /* verify that the input interface is unnumbered to the connected.
844 * the connected interface is the interface on which the subnet is
846 si = &vim->sw_interfaces[input_sw_if_index];
848 if (!(si->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED &&
849 (si->unnumbered_sw_if_index == conn_sw_if_index)))
851 /* the input interface is not unnumbered to the interface on which
852 * the sub-net is configured that covers the ARP request.
853 * So this is not the case for unnumbered.. */
861 arp_learn (vnet_main_t * vnm,
862 ethernet_arp_main_t * am, u32 sw_if_index, void *addr)
864 if (am->limit_arp_cache_size &&
865 pool_elts (am->ip4_entry_pool) >= am->limit_arp_cache_size)
866 unset_random_arp_entry ();
868 vnet_arp_set_ip4_over_ethernet (vnm, sw_if_index, addr, 0, 0);
869 return (ETHERNET_ARP_ERROR_l3_src_address_learned);
873 arp_input (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
875 ethernet_arp_main_t *am = ðernet_arp_main;
876 vnet_main_t *vnm = vnet_get_main ();
877 ip4_main_t *im4 = &ip4_main;
878 u32 n_left_from, next_index, *from, *to_next;
879 u32 n_replies_sent = 0, n_proxy_arp_replies_sent = 0;
881 from = vlib_frame_vector_args (frame);
882 n_left_from = frame->n_vectors;
883 next_index = node->cached_next_index;
885 if (node->flags & VLIB_NODE_FLAG_TRACE)
886 vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
888 sizeof (ethernet_arp_input_trace_t));
890 while (n_left_from > 0)
894 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
896 while (n_left_from > 0 && n_left_to_next > 0)
899 vnet_hw_interface_t *hw_if0;
900 ethernet_arp_header_t *arp0;
901 ethernet_header_t *eth_rx, *eth_tx;
902 ip4_address_t *if_addr0, proxy_src;
903 u32 pi0, error0, next0, sw_if_index0, conn_sw_if_index0, fib_index0;
904 u8 is_request0, dst_is_local0, is_unnum0, is_vrrp_reply0;
905 ethernet_proxy_arp_t *pa;
906 fib_node_index_t dst_fei, src_fei;
908 fib_entry_flag_t src_flags, dst_flags;
909 ip_adjacency_t *adj0 = NULL;
920 p0 = vlib_get_buffer (vm, pi0);
921 arp0 = vlib_buffer_get_current (p0);
922 /* Fill in ethernet header. */
923 eth_rx = ethernet_buffer_get_header (p0);
925 is_request0 = arp0->opcode
926 == clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_request);
928 error0 = ETHERNET_ARP_ERROR_replies_sent;
932 clib_net_to_host_u16 (ETHERNET_ARP_HARDWARE_TYPE_ethernet) ?
933 ETHERNET_ARP_ERROR_l2_type_not_ethernet : error0);
936 clib_net_to_host_u16 (ETHERNET_TYPE_IP4) ?
937 ETHERNET_ARP_ERROR_l3_type_not_ip4 : error0);
939 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
941 /* not playing the ARP game if the interface is not IPv4 enabled */
943 (im4->ip_enabled_by_sw_if_index[sw_if_index0] == 0 ?
944 ETHERNET_ARP_ERROR_interface_not_ip_enabled : error0);
949 /* Check that IP address is local and matches incoming interface. */
950 fib_index0 = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);
951 if (~0 == fib_index0)
953 error0 = ETHERNET_ARP_ERROR_interface_no_table;
957 dst_fei = ip4_fib_table_lookup (ip4_fib_get (fib_index0),
958 &arp0->ip4_over_ethernet[1].ip4,
960 dst_flags = fib_entry_get_flags (dst_fei);
962 conn_sw_if_index0 = fib_entry_get_resolving_interface (dst_fei);
964 /* Honor unnumbered interface, if any */
965 is_unnum0 = sw_if_index0 != conn_sw_if_index0;
969 * we're looking for FIB entries that indicate the source
970 * is attached. There may be more specific non-attached
971 * routes tht match the source, but these do not influence
972 * whether we respond to an ARP request, i.e. they do not
973 * influence whether we are the correct way for the sender
974 * to reach us, they only affect how we reach the sender.
976 fib_entry_t *src_fib_entry;
977 fib_entry_src_t *src;
988 src_fei = ip4_fib_table_lookup (ip4_fib_get (fib_index0),
990 ip4_over_ethernet[0].ip4,
992 src_fib_entry = fib_entry_get (src_fei);
995 * It's possible that the source that provides the
996 * flags we need, or the flags we must not have,
997 * is not the best source, so check then all.
1000 FOR_EACH_SRC_ADDED(src_fib_entry, src, source,
1002 src_flags = fib_entry_get_flags_for_source (src_fei, source);
1004 /* Reject requests/replies with our local interface
1006 if (FIB_ENTRY_FLAG_LOCAL & src_flags)
1008 error0 = ETHERNET_ARP_ERROR_l3_src_address_is_local;
1011 /* A Source must also be local to subnet of matching
1012 * interface address. */
1013 if ((FIB_ENTRY_FLAG_ATTACHED & src_flags) ||
1014 (FIB_ENTRY_FLAG_CONNECTED & src_flags))
1021 * The packet was sent from an address that is not
1022 * connected nor attached i.e. it is not from an
1023 * address that is covered by a link's sub-net,
1024 * nor is it a already learned host resp.
1030 * shorter mask lookup for the next iteration.
1032 fib_entry_get_prefix (src_fei, &pfx);
1033 mask = pfx.fp_len - 1;
1036 * continue until we hit the default route or we find
1037 * the attached we are looking for. The most likely
1038 * outcome is we find the attached with the first source
1039 * on the first lookup.
1043 !fib_entry_is_sourced (src_fei, FIB_SOURCE_DEFAULT_ROUTE));
1048 * the matching route is a not attached, i.e. it was
1049 * added as a result of routing, rather than interface/ARP
1050 * configuration. If the matching route is not a host route
1053 error0 = ETHERNET_ARP_ERROR_l3_src_address_not_local;
1058 if (!(FIB_ENTRY_FLAG_CONNECTED & dst_flags))
1060 error0 = ETHERNET_ARP_ERROR_l3_dst_address_not_local;
1064 if (sw_if_index0 != fib_entry_get_resolving_interface (src_fei))
1067 * The interface the ARP was received on is not the interface
1068 * on which the covering prefix is configured. Maybe this is a
1069 * case for unnumbered.
1074 dst_is_local0 = (FIB_ENTRY_FLAG_LOCAL & dst_flags);
1075 fib_entry_get_prefix (dst_fei, &pfx0);
1076 if_addr0 = &pfx0.fp_addr.ip4;
1080 clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply))
1083 (arp0->ip4_over_ethernet[0].ethernet, vrrp_prefix,
1084 sizeof (vrrp_prefix))));
1086 /* Trash ARP packets whose ARP-level source addresses do not
1087 match their L2-frame-level source addresses, unless it's
1088 a reply from a VRRP virtual router */
1090 (eth_rx->src_address, arp0->ip4_over_ethernet[0].ethernet,
1091 sizeof (eth_rx->src_address)) && !is_vrrp_reply0)
1093 error0 = ETHERNET_ARP_ERROR_l2_address_mismatch;
1097 /* Learn or update sender's mapping only for replies to addresses
1098 * that are local to the subnet */
1100 clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply) &&
1103 error0 = arp_learn (vnm, am, sw_if_index0,
1104 &arp0->ip4_over_ethernet[0]);
1110 ai = fib_entry_get_adj (src_fei);
1111 if (ADJ_INDEX_INVALID != ai)
1113 adj0 = adj_get (ai);
1117 error0 = ETHERNET_ARP_ERROR_missing_interface_address;
1120 /* Figure out how much to rewind current data from adjacency. */
1121 vlib_buffer_advance (p0, -adj0->rewrite_header.data_bytes);
1122 eth_tx = vlib_buffer_get_current (p0);
1124 vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
1125 hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
1127 /* Send reply back through input interface */
1128 vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
1129 next0 = ARP_INPUT_NEXT_REPLY_TX;
1131 arp0->opcode = clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply);
1133 arp0->ip4_over_ethernet[1] = arp0->ip4_over_ethernet[0];
1135 clib_memcpy (arp0->ip4_over_ethernet[0].ethernet,
1136 hw_if0->hw_address, 6);
1137 clib_mem_unaligned (&arp0->ip4_over_ethernet[0].ip4.data_u32, u32) =
1140 /* Hardware must be ethernet-like. */
1141 ASSERT (vec_len (hw_if0->hw_address) == 6);
1143 /* the rx nd tx ethernet headers wil overlap in the case
1144 * when we received a tagged VLAN=0 packet, but we are sending
1146 memmove (eth_tx->dst_address, eth_rx->src_address, 6);
1147 clib_memcpy (eth_tx->src_address, hw_if0->hw_address, 6);
1153 if (!arp_unnumbered (p0, sw_if_index0, conn_sw_if_index0))
1158 /* We are going to reply to this request, so learn the sender */
1159 error0 = arp_learn (vnm, am, sw_if_index0,
1160 &arp0->ip4_over_ethernet[1]);
1162 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1163 n_left_to_next, pi0, next0);
1165 n_replies_sent += 1;
1169 if (0 == arp0->ip4_over_ethernet[0].ip4.as_u32 ||
1170 (arp0->ip4_over_ethernet[0].ip4.as_u32 ==
1171 arp0->ip4_over_ethernet[1].ip4.as_u32))
1173 error0 = ETHERNET_ARP_ERROR_gratuitous_arp;
1176 /* See if proxy arp is configured for the address */
1179 vnet_sw_interface_t *si;
1180 u32 this_addr = clib_net_to_host_u32
1181 (arp0->ip4_over_ethernet[1].ip4.as_u32);
1184 si = vnet_get_sw_interface (vnm, sw_if_index0);
1186 if (!(si->flags & VNET_SW_INTERFACE_FLAG_PROXY_ARP))
1189 fib_index0 = vec_elt (im4->fib_index_by_sw_if_index,
1192 vec_foreach (pa, am->proxy_arps)
1194 u32 lo_addr = clib_net_to_host_u32 (pa->lo_addr);
1195 u32 hi_addr = clib_net_to_host_u32 (pa->hi_addr);
1197 /* an ARP request hit in the proxy-arp table? */
1198 if ((this_addr >= lo_addr && this_addr <= hi_addr) &&
1199 (fib_index0 == pa->fib_index))
1202 arp0->ip4_over_ethernet[1].ip4.data_u32;
1205 * change the interface address to the proxied
1207 if_addr0 = &proxy_src;
1209 n_proxy_arp_replies_sent++;
1217 next0 = ARP_INPUT_NEXT_DROP;
1218 p0->error = node->errors[error0];
1220 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1221 n_left_to_next, pi0, next0);
1224 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1227 vlib_error_count (vm, node->node_index,
1228 ETHERNET_ARP_ERROR_replies_sent,
1229 n_replies_sent - n_proxy_arp_replies_sent);
1231 vlib_error_count (vm, node->node_index,
1232 ETHERNET_ARP_ERROR_proxy_arp_replies_sent,
1233 n_proxy_arp_replies_sent);
1234 return frame->n_vectors;
1237 static char *ethernet_arp_error_strings[] = {
1238 #define _(sym,string) string,
1239 foreach_ethernet_arp_error
1244 VLIB_REGISTER_NODE (arp_input_node, static) =
1246 .function = arp_input,
1247 .name = "arp-input",
1248 .vector_size = sizeof (u32),
1249 .n_errors = ETHERNET_ARP_N_ERROR,
1250 .error_strings = ethernet_arp_error_strings,
1251 .n_next_nodes = ARP_INPUT_N_NEXT,
1253 [ARP_INPUT_NEXT_DROP] = "error-drop",
1254 [ARP_INPUT_NEXT_REPLY_TX] = "interface-output",
1256 .format_buffer = format_ethernet_arp_header,
1257 .format_trace = format_ethernet_arp_input_trace,
1262 ip4_arp_entry_sort (void *a1, void *a2)
1264 ethernet_arp_ip4_entry_t *e1 = a1;
1265 ethernet_arp_ip4_entry_t *e2 = a2;
1268 vnet_main_t *vnm = vnet_get_main ();
1270 cmp = vnet_sw_interface_compare (vnm, e1->sw_if_index, e2->sw_if_index);
1272 cmp = ip4_address_compare (&e1->ip4_address, &e2->ip4_address);
1276 ethernet_arp_ip4_entry_t *
1277 ip4_neighbor_entries (u32 sw_if_index)
1279 ethernet_arp_main_t *am = ðernet_arp_main;
1280 ethernet_arp_ip4_entry_t *n, *ns = 0;
1283 pool_foreach (n, am->ip4_entry_pool, ({
1284 if (sw_if_index != ~0 && n->sw_if_index != sw_if_index)
1286 vec_add1 (ns, n[0]);
1291 vec_sort_with_function (ns, ip4_arp_entry_sort);
1295 static clib_error_t *
1296 show_ip4_arp (vlib_main_t * vm,
1297 unformat_input_t * input, vlib_cli_command_t * cmd)
1299 vnet_main_t *vnm = vnet_get_main ();
1300 ethernet_arp_main_t *am = ðernet_arp_main;
1301 ethernet_arp_ip4_entry_t *e, *es;
1302 ethernet_proxy_arp_t *pa;
1303 clib_error_t *error = 0;
1306 /* Filter entries by interface if given. */
1308 (void) unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index);
1310 es = ip4_neighbor_entries (sw_if_index);
1313 vlib_cli_output (vm, "%U", format_ethernet_arp_ip4_entry, vnm, 0);
1316 vlib_cli_output (vm, "%U", format_ethernet_arp_ip4_entry, vnm, e);
1321 if (vec_len (am->proxy_arps))
1323 vlib_cli_output (vm, "Proxy arps enabled for:");
1324 vec_foreach (pa, am->proxy_arps)
1326 vlib_cli_output (vm, "Fib_index %d %U - %U ",
1328 format_ip4_address, &pa->lo_addr,
1329 format_ip4_address, &pa->hi_addr);
1337 * Display all the IPv4 ARP entries.
1340 * Example of how to display the IPv4 ARP table:
1341 * @cliexstart{show ip arp}
1342 * Time FIB IP4 Flags Ethernet Interface
1343 * 346.3028 0 6.1.1.3 de:ad:be:ef:ba:be GigabitEthernet2/0/0
1344 * 3077.4271 0 6.1.1.4 S de:ad:be:ef:ff:ff GigabitEthernet2/0/0
1345 * 2998.6409 1 6.2.2.3 de:ad:be:ef:00:01 GigabitEthernet2/0/0
1346 * Proxy arps enabled for:
1347 * Fib_index 0 6.0.0.1 - 6.0.0.11
1351 VLIB_CLI_COMMAND (show_ip4_arp_command, static) = {
1352 .path = "show ip arp",
1353 .function = show_ip4_arp,
1354 .short_help = "show ip arp",
1360 pg_edit_t l2_type, l3_type;
1361 pg_edit_t n_l2_address_bytes, n_l3_address_bytes;
1367 } ip4_over_ethernet[2];
1368 } pg_ethernet_arp_header_t;
1371 pg_ethernet_arp_header_init (pg_ethernet_arp_header_t * p)
1373 /* Initialize fields that are not bit fields in the IP header. */
1374 #define _(f) pg_edit_init (&p->f, ethernet_arp_header_t, f);
1377 _(n_l2_address_bytes);
1378 _(n_l3_address_bytes);
1380 _(ip4_over_ethernet[0].ethernet);
1381 _(ip4_over_ethernet[0].ip4);
1382 _(ip4_over_ethernet[1].ethernet);
1383 _(ip4_over_ethernet[1].ip4);
1388 unformat_pg_arp_header (unformat_input_t * input, va_list * args)
1390 pg_stream_t *s = va_arg (*args, pg_stream_t *);
1391 pg_ethernet_arp_header_t *p;
1394 p = pg_create_edit_group (s, sizeof (p[0]), sizeof (ethernet_arp_header_t),
1396 pg_ethernet_arp_header_init (p);
1399 pg_edit_set_fixed (&p->l2_type, ETHERNET_ARP_HARDWARE_TYPE_ethernet);
1400 pg_edit_set_fixed (&p->l3_type, ETHERNET_TYPE_IP4);
1401 pg_edit_set_fixed (&p->n_l2_address_bytes, 6);
1402 pg_edit_set_fixed (&p->n_l3_address_bytes, 4);
1404 if (!unformat (input, "%U: %U/%U -> %U/%U",
1406 unformat_ethernet_arp_opcode_net_byte_order, &p->opcode,
1408 unformat_ethernet_address, &p->ip4_over_ethernet[0].ethernet,
1410 unformat_ip4_address, &p->ip4_over_ethernet[0].ip4,
1412 unformat_ethernet_address, &p->ip4_over_ethernet[1].ethernet,
1414 unformat_ip4_address, &p->ip4_over_ethernet[1].ip4))
1416 /* Free up any edits we may have added. */
1417 pg_free_edit_group (s);
1424 ip4_set_arp_limit (u32 arp_limit)
1426 ethernet_arp_main_t *am = ðernet_arp_main;
1428 am->limit_arp_cache_size = arp_limit;
1433 * @brief Control Plane hook to remove an ARP entry
1436 vnet_arp_unset_ip4_over_ethernet (vnet_main_t * vnm,
1437 u32 sw_if_index, void *a_arg)
1439 ethernet_arp_ip4_over_ethernet_address_t *a = a_arg;
1440 vnet_arp_set_ip4_over_ethernet_rpc_args_t args;
1442 args.sw_if_index = sw_if_index;
1443 args.flags = ETHERNET_ARP_ARGS_REMOVE;
1444 clib_memcpy (&args.a, a, sizeof (*a));
1446 vl_api_rpc_call_main_thread (set_ip4_over_ethernet_rpc_callback,
1447 (u8 *) & args, sizeof (args));
1452 * @brief Internally generated event to flush the ARP cache on an
1453 * interface state change event.
1454 * A flush will remove dynamic ARP entries, and for statics remove the MAC
1455 * address from the corresponding adjacencies.
1458 vnet_arp_flush_ip4_over_ethernet (vnet_main_t * vnm,
1459 u32 sw_if_index, void *a_arg)
1461 ethernet_arp_ip4_over_ethernet_address_t *a = a_arg;
1462 vnet_arp_set_ip4_over_ethernet_rpc_args_t args;
1464 args.sw_if_index = sw_if_index;
1465 args.flags = ETHERNET_ARP_ARGS_FLUSH;
1466 clib_memcpy (&args.a, a, sizeof (*a));
1468 vl_api_rpc_call_main_thread (set_ip4_over_ethernet_rpc_callback,
1469 (u8 *) & args, sizeof (args));
1474 * @brief Internally generated event to populate the ARP cache on an
1475 * interface state change event.
1476 * For static entries this will re-source the adjacencies.
1478 * @param sw_if_index The interface on which the ARP entires are acted
1481 vnet_arp_populate_ip4_over_ethernet (vnet_main_t * vnm,
1482 u32 sw_if_index, void *a_arg)
1484 ethernet_arp_ip4_over_ethernet_address_t *a = a_arg;
1485 vnet_arp_set_ip4_over_ethernet_rpc_args_t args;
1487 args.sw_if_index = sw_if_index;
1488 args.flags = ETHERNET_ARP_ARGS_POPULATE;
1489 clib_memcpy (&args.a, a, sizeof (*a));
1491 vl_api_rpc_call_main_thread (set_ip4_over_ethernet_rpc_callback,
1492 (u8 *) & args, sizeof (args));
1497 * arp_add_del_interface_address
1499 * callback when an interface address is added or deleted
1502 arp_add_del_interface_address (ip4_main_t * im,
1505 ip4_address_t * address,
1507 u32 if_address_index, u32 is_del)
1510 * Flush the ARP cache of all entries covered by the address
1511 * that is being removed.
1513 ethernet_arp_main_t *am = ðernet_arp_main;
1514 ethernet_arp_ip4_entry_t *e;
1516 if (vec_len (am->ethernet_arp_by_sw_if_index) <= sw_if_index)
1521 ethernet_arp_interface_t *eai;
1522 u32 i, *to_delete = 0;
1525 eai = &am->ethernet_arp_by_sw_if_index[sw_if_index];
1528 hash_foreach_pair (pair, eai->arp_entries,
1530 e = pool_elt_at_index(am->ip4_entry_pool,
1532 if (ip4_destination_matches_route (im, &e->ip4_address,
1533 address, address_length))
1535 vec_add1 (to_delete, e - am->ip4_entry_pool);
1540 for (i = 0; i < vec_len (to_delete); i++)
1542 ethernet_arp_ip4_over_ethernet_address_t delme;
1543 e = pool_elt_at_index (am->ip4_entry_pool, to_delete[i]);
1545 clib_memcpy (&delme.ethernet, e->ethernet_address, 6);
1546 delme.ip4.as_u32 = e->ip4_address.as_u32;
1548 vnet_arp_flush_ip4_over_ethernet (vnet_get_main (),
1549 e->sw_if_index, &delme);
1552 vec_free (to_delete);
1556 static clib_error_t *
1557 ethernet_arp_init (vlib_main_t * vm)
1559 ethernet_arp_main_t *am = ðernet_arp_main;
1560 ip4_main_t *im = &ip4_main;
1561 clib_error_t *error;
1564 if ((error = vlib_call_init_function (vm, ethernet_init)))
1567 ethernet_register_input_type (vm, ETHERNET_TYPE_ARP, arp_input_node.index);
1569 pn = pg_get_node (arp_input_node.index);
1570 pn->unformat_edit = unformat_pg_arp_header;
1572 am->opcode_by_name = hash_create_string (0, sizeof (uword));
1573 #define _(o) hash_set_mem (am->opcode_by_name, #o, ETHERNET_ARP_OPCODE_##o);
1574 foreach_ethernet_arp_opcode;
1577 /* $$$ configurable */
1578 am->limit_arp_cache_size = 50000;
1580 am->pending_resolutions_by_address = hash_create (0, sizeof (uword));
1581 am->mac_changes_by_address = hash_create (0, sizeof (uword));
1583 /* don't trace ARP error packets */
1585 vlib_node_runtime_t *rt =
1586 vlib_node_get_runtime (vm, arp_input_node.index);
1589 vnet_pcap_drop_trace_filter_add_del \
1590 (rt->errors[ETHERNET_ARP_ERROR_##a], \
1592 foreach_ethernet_arp_error
1596 ip4_add_del_interface_address_callback_t cb;
1597 cb.function = arp_add_del_interface_address;
1598 cb.function_opaque = 0;
1599 vec_add1 (im->add_del_interface_address_callbacks, cb);
1604 VLIB_INIT_FUNCTION (ethernet_arp_init);
1607 arp_entry_free (ethernet_arp_interface_t * eai, ethernet_arp_ip4_entry_t * e)
1609 ethernet_arp_main_t *am = ðernet_arp_main;
1611 if (FIB_NODE_INDEX_INVALID != e->fib_entry_index)
1613 fib_prefix_t pfx = {
1615 .fp_proto = FIB_PROTOCOL_IP4,
1616 .fp_addr.ip4 = e->ip4_address,
1620 fib_index = ip4_fib_table_get_index_for_sw_if_index (e->sw_if_index);
1622 fib_table_entry_path_remove (fib_index, &pfx,
1626 e->sw_if_index, ~0, 1,
1627 FIB_ROUTE_PATH_FLAG_NONE);
1629 hash_unset (eai->arp_entries, e->ip4_address.as_u32);
1630 pool_put (am->ip4_entry_pool, e);
1634 vnet_arp_unset_ip4_over_ethernet_internal (vnet_main_t * vnm,
1635 vnet_arp_set_ip4_over_ethernet_rpc_args_t
1638 ethernet_arp_main_t *am = ðernet_arp_main;
1639 ethernet_arp_ip4_entry_t *e;
1640 ethernet_arp_interface_t *eai;
1642 eai = &am->ethernet_arp_by_sw_if_index[args->sw_if_index];
1644 e = arp_entry_find (eai, &args->a.ip4);
1648 arp_entry_free (eai, e);
1650 adj_nbr_walk_nh4 (e->sw_if_index,
1651 &e->ip4_address, arp_mk_incomplete_walk, NULL);
1658 vnet_arp_flush_ip4_over_ethernet_internal (vnet_main_t * vnm,
1659 vnet_arp_set_ip4_over_ethernet_rpc_args_t
1662 ethernet_arp_main_t *am = ðernet_arp_main;
1663 ethernet_arp_ip4_entry_t *e;
1664 ethernet_arp_interface_t *eai;
1666 eai = &am->ethernet_arp_by_sw_if_index[args->sw_if_index];
1668 e = arp_entry_find (eai, &args->a.ip4);
1672 adj_nbr_walk_nh4 (e->sw_if_index,
1673 &e->ip4_address, arp_mk_incomplete_walk, e);
1676 * The difference between flush and unset, is that an unset
1677 * means delete for static and dynamic entries. A flush
1678 * means delete only for dynamic. Flushing is what the DP
1679 * does in response to interface events. unset is only done
1680 * by the control plane.
1682 if (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_DYNAMIC)
1684 arp_entry_free (eai, e);
1691 vnet_arp_populate_ip4_over_ethernet_internal (vnet_main_t * vnm,
1692 vnet_arp_set_ip4_over_ethernet_rpc_args_t
1695 ethernet_arp_main_t *am = ðernet_arp_main;
1696 ethernet_arp_ip4_entry_t *e;
1697 ethernet_arp_interface_t *eai;
1699 eai = &am->ethernet_arp_by_sw_if_index[args->sw_if_index];
1701 e = arp_entry_find (eai, &args->a.ip4);
1705 adj_nbr_walk_nh4 (e->sw_if_index,
1706 &e->ip4_address, arp_mk_complete_walk, e);
1712 set_ip4_over_ethernet_rpc_callback (vnet_arp_set_ip4_over_ethernet_rpc_args_t
1715 vnet_main_t *vm = vnet_get_main ();
1716 ASSERT (vlib_get_thread_index () == 0);
1718 if (a->flags & ETHERNET_ARP_ARGS_REMOVE)
1719 vnet_arp_unset_ip4_over_ethernet_internal (vm, a);
1720 else if (a->flags & ETHERNET_ARP_ARGS_FLUSH)
1721 vnet_arp_flush_ip4_over_ethernet_internal (vm, a);
1722 else if (a->flags & ETHERNET_ARP_ARGS_POPULATE)
1723 vnet_arp_populate_ip4_over_ethernet_internal (vm, a);
1725 vnet_arp_set_ip4_over_ethernet_internal (vm, a);
1729 * @brief Invoked when the interface's admin state changes
1731 static clib_error_t *
1732 ethernet_arp_sw_interface_up_down (vnet_main_t * vnm,
1733 u32 sw_if_index, u32 flags)
1735 ethernet_arp_main_t *am = ðernet_arp_main;
1736 ethernet_arp_ip4_entry_t *e;
1737 u32 i, *to_delete = 0;
1740 pool_foreach (e, am->ip4_entry_pool,
1742 if (e->sw_if_index == sw_if_index)
1743 vec_add1 (to_delete,
1744 e - am->ip4_entry_pool);
1748 for (i = 0; i < vec_len (to_delete); i++)
1750 ethernet_arp_ip4_over_ethernet_address_t delme;
1751 e = pool_elt_at_index (am->ip4_entry_pool, to_delete[i]);
1753 clib_memcpy (&delme.ethernet, e->ethernet_address, 6);
1754 delme.ip4.as_u32 = e->ip4_address.as_u32;
1756 if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
1758 vnet_arp_populate_ip4_over_ethernet (vnm, e->sw_if_index, &delme);
1762 vnet_arp_flush_ip4_over_ethernet (vnm, e->sw_if_index, &delme);
1766 vec_free (to_delete);
1771 VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (ethernet_arp_sw_interface_up_down);
1774 increment_ip4_and_mac_address (ethernet_arp_ip4_over_ethernet_address_t * a)
1779 for (i = 3; i >= 0; i--)
1781 old = a->ip4.as_u8[i];
1782 a->ip4.as_u8[i] += 1;
1783 if (old < a->ip4.as_u8[i])
1787 for (i = 5; i >= 0; i--)
1789 old = a->ethernet[i];
1790 a->ethernet[i] += 1;
1791 if (old < a->ethernet[i])
1797 vnet_arp_set_ip4_over_ethernet (vnet_main_t * vnm,
1798 u32 sw_if_index, void *a_arg,
1799 int is_static, int is_no_fib_entry)
1801 ethernet_arp_ip4_over_ethernet_address_t *a = a_arg;
1802 vnet_arp_set_ip4_over_ethernet_rpc_args_t args;
1804 args.sw_if_index = sw_if_index;
1805 args.is_static = is_static;
1806 args.is_no_fib_entry = is_no_fib_entry;
1808 clib_memcpy (&args.a, a, sizeof (*a));
1810 vl_api_rpc_call_main_thread (set_ip4_over_ethernet_rpc_callback,
1811 (u8 *) & args, sizeof (args));
1816 vnet_proxy_arp_add_del (ip4_address_t * lo_addr,
1817 ip4_address_t * hi_addr, u32 fib_index, int is_del)
1819 ethernet_arp_main_t *am = ðernet_arp_main;
1820 ethernet_proxy_arp_t *pa;
1821 u32 found_at_index = ~0;
1823 vec_foreach (pa, am->proxy_arps)
1825 if (pa->lo_addr == lo_addr->as_u32
1826 && pa->hi_addr == hi_addr->as_u32 && pa->fib_index == fib_index)
1828 found_at_index = pa - am->proxy_arps;
1833 if (found_at_index != ~0)
1835 /* Delete, otherwise it's already in the table */
1837 vec_delete (am->proxy_arps, 1, found_at_index);
1840 /* delete, no such entry */
1842 return VNET_API_ERROR_NO_SUCH_ENTRY;
1844 /* add, not in table */
1845 vec_add2 (am->proxy_arps, pa, 1);
1846 pa->lo_addr = lo_addr->as_u32;
1847 pa->hi_addr = hi_addr->as_u32;
1848 pa->fib_index = fib_index;
1853 * Remove any proxy arp entries asdociated with the
1857 vnet_proxy_arp_fib_reset (u32 fib_id)
1859 ethernet_arp_main_t *am = ðernet_arp_main;
1860 ethernet_proxy_arp_t *pa;
1861 u32 *entries_to_delete = 0;
1865 fib_index = fib_table_find (FIB_PROTOCOL_IP4, fib_id);
1866 if (~0 == fib_index)
1867 return VNET_API_ERROR_NO_SUCH_ENTRY;
1869 vec_foreach (pa, am->proxy_arps)
1871 if (pa->fib_index == fib_index)
1873 vec_add1 (entries_to_delete, pa - am->proxy_arps);
1877 for (i = 0; i < vec_len (entries_to_delete); i++)
1879 vec_delete (am->proxy_arps, 1, entries_to_delete[i]);
1882 vec_free (entries_to_delete);
1887 static clib_error_t *
1888 ip_arp_add_del_command_fn (vlib_main_t * vm,
1889 unformat_input_t * input, vlib_cli_command_t * cmd)
1891 vnet_main_t *vnm = vnet_get_main ();
1893 ethernet_arp_ip4_over_ethernet_address_t lo_addr, hi_addr, addr;
1900 int is_no_fib_entry = 0;
1903 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
1905 /* set ip arp TenGigE1/1/0/1 1.2.3.4 aa:bb:... or aabb.ccdd... */
1906 if (unformat (input, "%U %U %U",
1907 unformat_vnet_sw_interface, vnm, &sw_if_index,
1908 unformat_ip4_address, &addr.ip4,
1909 unformat_ethernet_address, &addr.ethernet))
1912 else if (unformat (input, "delete") || unformat (input, "del"))
1915 else if (unformat (input, "static"))
1918 else if (unformat (input, "no-fib-entry"))
1919 is_no_fib_entry = 1;
1921 else if (unformat (input, "count %d", &count))
1924 else if (unformat (input, "fib-id %d", &fib_id))
1926 fib_index = fib_table_find (FIB_PROTOCOL_IP4, fib_id);
1928 if (~0 == fib_index)
1929 return clib_error_return (0, "fib ID %d doesn't exist\n", fib_id);
1932 else if (unformat (input, "proxy %U - %U",
1933 unformat_ip4_address, &lo_addr.ip4,
1934 unformat_ip4_address, &hi_addr.ip4))
1942 (void) vnet_proxy_arp_add_del (&lo_addr.ip4, &hi_addr.ip4,
1951 for (i = 0; i < count; i++)
1955 uword event_type, *event_data = 0;
1957 /* Park the debug CLI until the arp entry is installed */
1958 vnet_register_ip4_arp_resolution_event
1959 (vnm, &addr.ip4, vlib_current_process (vm),
1960 1 /* type */ , 0 /* data */ );
1962 vnet_arp_set_ip4_over_ethernet
1963 (vnm, sw_if_index, &addr, is_static, is_no_fib_entry);
1965 vlib_process_wait_for_event (vm);
1966 event_type = vlib_process_get_events (vm, &event_data);
1967 vec_reset_length (event_data);
1968 if (event_type != 1)
1969 clib_warning ("event type %d unexpected", event_type);
1972 vnet_arp_unset_ip4_over_ethernet (vnm, sw_if_index, &addr);
1974 increment_ip4_and_mac_address (&addr);
1979 return clib_error_return (0, "unknown input `%U'",
1980 format_unformat_error, input);
1988 * Add or delete IPv4 ARP cache entries.
1990 * @note 'set ip arp' options (e.g. delete, static, 'fib-id <id>',
1991 * 'count <number>', 'interface ip4_addr mac_addr') can be added in
1992 * any order and combination.
1996 * Add or delete IPv4 ARP cache entries as follows. MAC Address can be in
1997 * either aa:bb:cc:dd:ee:ff format or aabb.ccdd.eeff format.
1998 * @cliexcmd{set ip arp GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
1999 * @cliexcmd{set ip arp delete GigabitEthernet2/0/0 6.0.0.3 de:ad:be:ef:ba:be}
2001 * To add or delete an IPv4 ARP cache entry to or from a specific fib
2003 * @cliexcmd{set ip arp fib-id 1 GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2004 * @cliexcmd{set ip arp fib-id 1 delete GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2006 * Add or delete IPv4 static ARP cache entries as follows:
2007 * @cliexcmd{set ip arp static GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2008 * @cliexcmd{set ip arp static delete GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2010 * For testing / debugging purposes, the 'set ip arp' command can add or
2011 * delete multiple entries. Supply the 'count N' parameter:
2012 * @cliexcmd{set ip arp count 10 GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2015 VLIB_CLI_COMMAND (ip_arp_add_del_command, static) = {
2016 .path = "set ip arp",
2018 "set ip arp [del] <intfc> <ip-address> <mac-address> [static] [no-fib-entry] [count <count>] [fib-id <fib-id>] [proxy <lo-addr> - <hi-addr>]",
2019 .function = ip_arp_add_del_command_fn,
2023 static clib_error_t *
2024 set_int_proxy_arp_command_fn (vlib_main_t * vm,
2026 input, vlib_cli_command_t * cmd)
2028 vnet_main_t *vnm = vnet_get_main ();
2030 vnet_sw_interface_t *si;
2034 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2036 if (unformat (input, "%U", unformat_vnet_sw_interface,
2039 else if (unformat (input, "enable") || unformat (input, "on"))
2041 else if (unformat (input, "disable") || unformat (input, "off"))
2048 return clib_error_return (0, "unknown input '%U'",
2049 format_unformat_error, input);
2051 si = vnet_get_sw_interface (vnm, sw_if_index);
2054 si->flags |= VNET_SW_INTERFACE_FLAG_PROXY_ARP;
2056 si->flags &= ~VNET_SW_INTERFACE_FLAG_PROXY_ARP;
2063 * Enable proxy-arp on an interface. The vpp stack will answer ARP
2064 * requests for the indicated address range. Multiple proxy-arp
2065 * ranges may be provisioned.
2067 * @note Proxy ARP as a technology is infamous for blackholing traffic.
2068 * Also, the underlying implementation has not been performance-tuned.
2069 * Avoid creating an unnecessarily large set of ranges.
2072 * To enable proxy arp on a range of addresses, use:
2073 * @cliexcmd{set ip arp proxy 6.0.0.1 - 6.0.0.11}
2074 * Append 'del' to delete a range of proxy ARP addresses:
2075 * @cliexcmd{set ip arp proxy 6.0.0.1 - 6.0.0.11 del}
2076 * You must then specifically enable proxy arp on individual interfaces:
2077 * @cliexcmd{set interface proxy-arp GigabitEthernet0/8/0 enable}
2078 * To disable proxy arp on an individual interface:
2079 * @cliexcmd{set interface proxy-arp GigabitEthernet0/8/0 disable}
2081 VLIB_CLI_COMMAND (set_int_proxy_enable_command, static) = {
2082 .path = "set interface proxy-arp",
2084 "set interface proxy-arp <intfc> [enable|disable]",
2085 .function = set_int_proxy_arp_command_fn,
2091 * ARP/ND Termination in a L2 Bridge Domain based on IP4/IP6 to MAC
2092 * hash tables mac_by_ip4 and mac_by_ip6 for each BD.
2096 ARP_TERM_NEXT_L2_OUTPUT,
2101 u32 arp_term_next_node_index[32];
2104 arp_term_l2bd (vlib_main_t * vm,
2105 vlib_node_runtime_t * node, vlib_frame_t * frame)
2107 l2input_main_t *l2im = &l2input_main;
2108 u32 n_left_from, next_index, *from, *to_next;
2109 u32 n_replies_sent = 0;
2110 u16 last_bd_index = ~0;
2111 l2_bridge_domain_t *last_bd_config = 0;
2112 l2_input_config_t *cfg0;
2114 from = vlib_frame_vector_args (frame);
2115 n_left_from = frame->n_vectors;
2116 next_index = node->cached_next_index;
2118 while (n_left_from > 0)
2122 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2124 while (n_left_from > 0 && n_left_to_next > 0)
2127 ethernet_header_t *eth0;
2128 ethernet_arp_header_t *arp0;
2131 u32 pi0, error0, next0, sw_if_index0;
2143 n_left_to_next -= 1;
2145 p0 = vlib_get_buffer (vm, pi0);
2146 // Terminate only local (SHG == 0) ARP
2147 if (vnet_buffer (p0)->l2.shg != 0)
2148 goto next_l2_feature;
2150 eth0 = vlib_buffer_get_current (p0);
2151 l3h0 = (u8 *) eth0 + vnet_buffer (p0)->l2.l2_len;
2152 ethertype0 = clib_net_to_host_u16 (*(u16 *) (l3h0 - 2));
2153 arp0 = (ethernet_arp_header_t *) l3h0;
2155 if (PREDICT_FALSE ((ethertype0 != ETHERNET_TYPE_ARP) ||
2157 clib_host_to_net_u16
2158 (ETHERNET_ARP_OPCODE_request))))
2161 /* Must be ARP request packet here */
2162 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) &&
2163 (p0->flags & VLIB_BUFFER_IS_TRACED)))
2165 u8 *t0 = vlib_add_trace (vm, node, p0,
2166 sizeof (ethernet_arp_input_trace_t));
2167 clib_memcpy (t0, l3h0, sizeof (ethernet_arp_input_trace_t));
2170 error0 = ETHERNET_ARP_ERROR_replies_sent;
2173 clib_net_to_host_u16 (ETHERNET_ARP_HARDWARE_TYPE_ethernet)
2174 ? ETHERNET_ARP_ERROR_l2_type_not_ethernet : error0);
2177 clib_net_to_host_u16 (ETHERNET_TYPE_IP4) ?
2178 ETHERNET_ARP_ERROR_l3_type_not_ip4 : error0);
2180 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
2187 clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply))
2190 (arp0->ip4_over_ethernet[0].ethernet, vrrp_prefix,
2191 sizeof (vrrp_prefix))));
2193 /* Trash ARP packets whose ARP-level source addresses do not
2194 match their L2-frame-level source addresses, unless it's
2195 a reply from a VRRP virtual router */
2197 (memcmp (eth0->src_address, arp0->ip4_over_ethernet[0].ethernet,
2198 sizeof (eth0->src_address)) && !is_vrrp_reply0))
2200 error0 = ETHERNET_ARP_ERROR_l2_address_mismatch;
2204 /* Check if anyone want ARP request events for L2 BDs */
2206 pending_resolution_t *mc;
2207 ethernet_arp_main_t *am = ðernet_arp_main;
2208 uword *p = hash_get (am->mac_changes_by_address, 0);
2211 u32 next_index = p[0];
2212 while (next_index != (u32) ~ 0)
2214 int (*fp) (u32, u8 *, u32, u32);
2216 mc = pool_elt_at_index (am->mac_changes, next_index);
2217 fp = mc->data_callback;
2218 /* Call the callback, return 1 to suppress dup events */
2220 rv = (*fp) (mc->data,
2221 arp0->ip4_over_ethernet[0].ethernet,
2223 arp0->ip4_over_ethernet[0].ip4.as_u32);
2224 /* Signal the resolver process */
2226 vlib_process_signal_event (vm, mc->node_index,
2227 mc->type_opaque, mc->data);
2228 next_index = mc->next_index;
2233 /* lookup BD mac_by_ip4 hash table for MAC entry */
2234 ip0 = arp0->ip4_over_ethernet[1].ip4.as_u32;
2235 bd_index0 = vnet_buffer (p0)->l2.bd_index;
2236 if (PREDICT_FALSE ((bd_index0 != last_bd_index)
2237 || (last_bd_index == (u16) ~ 0)))
2239 last_bd_index = bd_index0;
2240 last_bd_config = vec_elt_at_index (l2im->bd_configs, bd_index0);
2242 macp0 = (u8 *) hash_get (last_bd_config->mac_by_ip4, ip0);
2244 if (PREDICT_FALSE (!macp0))
2245 goto next_l2_feature; /* MAC not found */
2247 /* MAC found, send ARP reply -
2248 Convert ARP request packet to ARP reply */
2249 arp0->opcode = clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply);
2250 arp0->ip4_over_ethernet[1] = arp0->ip4_over_ethernet[0];
2251 arp0->ip4_over_ethernet[0].ip4.as_u32 = ip0;
2252 clib_memcpy (arp0->ip4_over_ethernet[0].ethernet, macp0, 6);
2253 clib_memcpy (eth0->dst_address, eth0->src_address, 6);
2254 clib_memcpy (eth0->src_address, macp0, 6);
2255 n_replies_sent += 1;
2258 /* For BVI, need to use l2-fwd node to send ARP reply as
2259 l2-output node cannot output packet to BVI properly */
2260 cfg0 = vec_elt_at_index (l2im->configs, sw_if_index0);
2261 if (PREDICT_FALSE (cfg0->bvi))
2263 vnet_buffer (p0)->l2.feature_bitmap |= L2INPUT_FEAT_FWD;
2264 vnet_buffer (p0)->sw_if_index[VLIB_RX] = 0;
2265 goto next_l2_feature;
2268 /* Send ARP/ND reply back out input interface through l2-output */
2269 vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
2270 next0 = ARP_TERM_NEXT_L2_OUTPUT;
2271 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2272 to_next, n_left_to_next, pi0,
2277 /* IP6 ND event notification or solicitation handling to generate
2278 local response instead of flooding */
2279 iph0 = (ip6_header_t *) l3h0;
2280 if (PREDICT_FALSE (ethertype0 == ETHERNET_TYPE_IP6 &&
2281 iph0->protocol == IP_PROTOCOL_ICMP6 &&
2282 !ip6_address_is_unspecified
2283 (&iph0->src_address)))
2285 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
2286 if (vnet_ip6_nd_term
2287 (vm, node, p0, eth0, iph0, sw_if_index0,
2288 vnet_buffer (p0)->l2.bd_index))
2289 goto output_response;
2294 u32 feature_bitmap0 =
2295 vnet_buffer (p0)->l2.feature_bitmap & ~L2INPUT_FEAT_ARP_TERM;
2296 vnet_buffer (p0)->l2.feature_bitmap = feature_bitmap0;
2298 feat_bitmap_get_next_node_index (arp_term_next_node_index,
2300 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2301 to_next, n_left_to_next,
2307 if (0 == arp0->ip4_over_ethernet[0].ip4.as_u32 ||
2308 (arp0->ip4_over_ethernet[0].ip4.as_u32 ==
2309 arp0->ip4_over_ethernet[1].ip4.as_u32))
2311 error0 = ETHERNET_ARP_ERROR_gratuitous_arp;
2313 next0 = ARP_TERM_NEXT_DROP;
2314 p0->error = node->errors[error0];
2316 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2317 to_next, n_left_to_next, pi0,
2321 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2324 vlib_error_count (vm, node->node_index,
2325 ETHERNET_ARP_ERROR_replies_sent, n_replies_sent);
2326 return frame->n_vectors;
2330 VLIB_REGISTER_NODE (arp_term_l2bd_node, static) = {
2331 .function = arp_term_l2bd,
2332 .name = "arp-term-l2bd",
2333 .vector_size = sizeof (u32),
2334 .n_errors = ETHERNET_ARP_N_ERROR,
2335 .error_strings = ethernet_arp_error_strings,
2336 .n_next_nodes = ARP_TERM_N_NEXT,
2338 [ARP_TERM_NEXT_L2_OUTPUT] = "l2-output",
2339 [ARP_TERM_NEXT_DROP] = "error-drop",
2341 .format_buffer = format_ethernet_arp_header,
2342 .format_trace = format_arp_term_input_trace,
2347 arp_term_init (vlib_main_t * vm)
2349 // Initialize the feature next-node indexes
2350 feat_bitmap_init_next_nodes (vm,
2351 arp_term_l2bd_node.index,
2353 l2input_get_feat_names (),
2354 arp_term_next_node_index);
2358 VLIB_INIT_FUNCTION (arp_term_init);
2361 change_arp_mac (u32 sw_if_index, ethernet_arp_ip4_entry_t * e)
2363 if (e->sw_if_index == sw_if_index)
2365 adj_nbr_walk_nh4 (e->sw_if_index,
2366 &e->ip4_address, arp_mk_complete_walk, e);
2371 ethernet_arp_change_mac (u32 sw_if_index)
2373 ethernet_arp_main_t *am = ðernet_arp_main;
2374 ethernet_arp_ip4_entry_t *e;
2377 pool_foreach (e, am->ip4_entry_pool,
2379 change_arp_mac (sw_if_index, e);
2385 send_ip4_garp (vlib_main_t * vm, vnet_hw_interface_t * hi)
2387 ip4_main_t *i4m = &ip4_main;
2388 u32 sw_if_index = hi->sw_if_index;
2389 ip4_address_t *ip4_addr = ip4_interface_first_address (i4m, sw_if_index, 0);
2393 clib_warning ("Sending GARP for IP4 address %U on sw_if_idex %d",
2394 format_ip4_address, ip4_addr, sw_if_index);
2396 /* Form GARP packet for output - Gratuitous ARP is an ARP request packet
2397 where the interface IP/MAC pair is used for both source and request
2398 MAC/IP pairs in the request */
2400 ethernet_arp_header_t *h = vlib_packet_template_get_packet
2401 (vm, &i4m->ip4_arp_request_packet_template, &bi);
2402 clib_memcpy (h->ip4_over_ethernet[0].ethernet, hi->hw_address,
2403 sizeof (h->ip4_over_ethernet[0].ethernet));
2404 clib_memcpy (h->ip4_over_ethernet[1].ethernet, hi->hw_address,
2405 sizeof (h->ip4_over_ethernet[1].ethernet));
2406 h->ip4_over_ethernet[0].ip4 = ip4_addr[0];
2407 h->ip4_over_ethernet[1].ip4 = ip4_addr[0];
2409 /* Setup MAC header with ARP Etype and broadcast DMAC */
2410 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
2411 vlib_buffer_advance (b, -sizeof (ethernet_header_t));
2412 ethernet_header_t *e = vlib_buffer_get_current (b);
2413 e->type = clib_host_to_net_u16 (ETHERNET_TYPE_ARP);
2414 clib_memcpy (e->src_address, hi->hw_address, sizeof (e->src_address));
2415 memset (e->dst_address, 0xff, sizeof (e->dst_address));
2417 /* Send GARP packet out the specified interface */
2418 vnet_buffer (b)->sw_if_index[VLIB_RX] =
2419 vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index;
2420 vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index);
2421 u32 *to_next = vlib_frame_vector_args (f);
2424 vlib_put_frame_to_node (vm, hi->output_node_index, f);
2428 static vlib_node_registration_t send_garp_na_proc_node;
2431 send_garp_na_process (vlib_main_t * vm,
2432 vlib_node_runtime_t * rt, vlib_frame_t * f)
2434 vnet_main_t *vnm = vnet_get_main ();
2435 uword event_type, *event_data = 0;
2437 send_garp_na_process_node_index = send_garp_na_proc_node.index;
2441 vlib_process_wait_for_event (vm);
2442 event_type = vlib_process_get_events (vm, &event_data);
2443 if ((event_type == SEND_GARP_NA) && (vec_len (event_data) >= 1))
2445 u32 hw_if_index = event_data[0];
2446 vnet_hw_interface_t *hi = vnet_get_hw_interface (vnm, hw_if_index);
2447 send_ip4_garp (vm, hi);
2448 send_ip6_na (vm, hi);
2450 vec_reset_length (event_data);
2457 VLIB_REGISTER_NODE (send_garp_na_proc_node, static) = {
2458 .function = send_garp_na_process,
2459 .type = VLIB_NODE_TYPE_PROCESS,
2460 .name = "send-garp-na-process",
2465 * fd.io coding-style-patch-verification: ON
2468 * eval: (c-set-style "gnu")