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.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>
29 #include <vnet/l2/feat_bitmap.h>
35 * This file contains code to manage the IPv4 ARP tables (IP Address
36 * to MAC Address lookup).
40 void vl_api_rpc_call_main_thread (void *fp, u8 * data, u32 data_length);
43 * @brief Per-interface ARP configuration and state
45 typedef struct ethernet_arp_interface_t_
48 * Hash table of ARP entries.
49 * Since this hash table is per-interface, the key is only the IPv4 address.
52 } ethernet_arp_interface_t;
56 ip4_address_t lo_addr;
57 ip4_address_t hi_addr;
59 } ethernet_proxy_arp_t;
67 /* Used for arp event notification only */
70 } pending_resolution_t;
74 /* Hash tables mapping name to opcode. */
75 uword *opcode_by_name;
77 /* lite beer "glean" adjacency handling */
78 uword *pending_resolutions_by_address;
79 pending_resolution_t *pending_resolutions;
81 /* Mac address change notification */
82 uword *mac_changes_by_address;
83 pending_resolution_t *mac_changes;
85 ethernet_arp_ip4_entry_t *ip4_entry_pool;
87 /* ARP attack mitigation */
89 u32 limit_arp_cache_size;
91 /** Per interface state */
92 ethernet_arp_interface_t *ethernet_arp_by_sw_if_index;
94 /* Proxy arp vector */
95 ethernet_proxy_arp_t *proxy_arps;
97 uword wc_ip4_arp_publisher_node;
98 uword wc_ip4_arp_publisher_et;
99 } ethernet_arp_main_t;
101 static ethernet_arp_main_t ethernet_arp_main;
106 ethernet_arp_ip4_over_ethernet_address_t a;
110 #define ETHERNET_ARP_ARGS_REMOVE (1<<0)
111 #define ETHERNET_ARP_ARGS_FLUSH (1<<1)
112 #define ETHERNET_ARP_ARGS_POPULATE (1<<2)
113 #define ETHERNET_ARP_ARGS_WC_PUB (1<<3)
114 } vnet_arp_set_ip4_over_ethernet_rpc_args_t;
116 static const u8 vrrp_prefix[] = { 0x00, 0x00, 0x5E, 0x00, 0x01 };
118 /* Node index for send_garp_na_process */
119 u32 send_garp_na_process_node_index;
122 set_ip4_over_ethernet_rpc_callback (vnet_arp_set_ip4_over_ethernet_rpc_args_t
126 format_ethernet_arp_hardware_type (u8 * s, va_list * va)
128 ethernet_arp_hardware_type_t h = va_arg (*va, ethernet_arp_hardware_type_t);
132 #define _(n,f) case n: t = #f; break;
133 foreach_ethernet_arp_hardware_type;
137 return format (s, "unknown 0x%x", h);
140 return format (s, "%s", t);
144 format_ethernet_arp_opcode (u8 * s, va_list * va)
146 ethernet_arp_opcode_t o = va_arg (*va, ethernet_arp_opcode_t);
150 #define _(f) case ETHERNET_ARP_OPCODE_##f: t = #f; break;
151 foreach_ethernet_arp_opcode;
155 return format (s, "unknown 0x%x", o);
158 return format (s, "%s", t);
162 unformat_ethernet_arp_opcode_host_byte_order (unformat_input_t * input,
165 int *result = va_arg (*args, int *);
166 ethernet_arp_main_t *am = ðernet_arp_main;
169 /* Numeric opcode. */
170 if (unformat (input, "0x%x", &x) || unformat (input, "%d", &x))
179 if (unformat_user (input, unformat_vlib_number_by_name,
180 am->opcode_by_name, &i))
190 unformat_ethernet_arp_opcode_net_byte_order (unformat_input_t * input,
193 int *result = va_arg (*args, int *);
195 (input, unformat_ethernet_arp_opcode_host_byte_order, result))
198 *result = clib_host_to_net_u16 ((u16) * result);
203 format_ethernet_arp_header (u8 * s, va_list * va)
205 ethernet_arp_header_t *a = va_arg (*va, ethernet_arp_header_t *);
206 u32 max_header_bytes = va_arg (*va, u32);
208 u16 l2_type, l3_type;
210 if (max_header_bytes != 0 && sizeof (a[0]) > max_header_bytes)
211 return format (s, "ARP header truncated");
213 l2_type = clib_net_to_host_u16 (a->l2_type);
214 l3_type = clib_net_to_host_u16 (a->l3_type);
216 indent = format_get_indent (s);
218 s = format (s, "%U, type %U/%U, address size %d/%d",
219 format_ethernet_arp_opcode, clib_net_to_host_u16 (a->opcode),
220 format_ethernet_arp_hardware_type, l2_type,
221 format_ethernet_type, l3_type,
222 a->n_l2_address_bytes, a->n_l3_address_bytes);
224 if (l2_type == ETHERNET_ARP_HARDWARE_TYPE_ethernet
225 && l3_type == ETHERNET_TYPE_IP4)
227 s = format (s, "\n%U%U/%U -> %U/%U",
228 format_white_space, indent,
229 format_ethernet_address, a->ip4_over_ethernet[0].ethernet,
230 format_ip4_address, &a->ip4_over_ethernet[0].ip4,
231 format_ethernet_address, a->ip4_over_ethernet[1].ethernet,
232 format_ip4_address, &a->ip4_over_ethernet[1].ip4);
236 uword n2 = a->n_l2_address_bytes;
237 uword n3 = a->n_l3_address_bytes;
238 s = format (s, "\n%U%U/%U -> %U/%U",
239 format_white_space, indent,
240 format_hex_bytes, a->data + 0 * n2 + 0 * n3, n2,
241 format_hex_bytes, a->data + 1 * n2 + 0 * n3, n3,
242 format_hex_bytes, a->data + 1 * n2 + 1 * n3, n2,
243 format_hex_bytes, a->data + 2 * n2 + 1 * n3, n3);
250 format_ethernet_arp_ip4_entry (u8 * s, va_list * va)
252 vnet_main_t *vnm = va_arg (*va, vnet_main_t *);
253 ethernet_arp_ip4_entry_t *e = va_arg (*va, ethernet_arp_ip4_entry_t *);
254 vnet_sw_interface_t *si;
258 return format (s, "%=12s%=16s%=6s%=20s%=24s", "Time", "IP4",
259 "Flags", "Ethernet", "Interface");
261 si = vnet_get_sw_interface (vnm, e->sw_if_index);
263 if (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC)
264 flags = format (flags, "S");
266 if (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_DYNAMIC)
267 flags = format (flags, "D");
269 if (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_NO_FIB_ENTRY)
270 flags = format (flags, "N");
272 s = format (s, "%=12U%=16U%=6s%=20U%U",
273 format_vlib_time, vnm->vlib_main, e->time_last_updated,
274 format_ip4_address, &e->ip4_address,
275 flags ? (char *) flags : "",
276 format_ethernet_address, e->ethernet_address,
277 format_vnet_sw_interface_name, vnm, si);
286 } ethernet_arp_input_trace_t;
289 format_ethernet_arp_input_trace (u8 * s, va_list * va)
291 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
292 CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
293 ethernet_arp_input_trace_t *t = va_arg (*va, ethernet_arp_input_trace_t *);
296 format_ethernet_arp_header,
297 t->packet_data, sizeof (t->packet_data));
303 format_arp_term_input_trace (u8 * s, va_list * va)
305 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
306 CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
307 ethernet_arp_input_trace_t *t = va_arg (*va, ethernet_arp_input_trace_t *);
309 /* arp-term trace data saved is either arp or ip6/icmp6 packet:
310 - for arp, the 1st 16-bit field is hw type of value of 0x0001.
311 - for ip6, the first nibble has value of 6. */
312 s = format (s, "%U", t->packet_data[0] == 0 ?
313 format_ethernet_arp_header : format_ip6_header,
314 t->packet_data, sizeof (t->packet_data));
320 arp_nbr_probe (ip_adjacency_t * adj)
322 vnet_main_t *vnm = vnet_get_main ();
323 ip4_main_t *im = &ip4_main;
324 ip_interface_address_t *ia;
325 ethernet_arp_header_t *h;
326 vnet_hw_interface_t *hi;
327 vnet_sw_interface_t *si;
333 vm = vlib_get_main ();
335 si = vnet_get_sw_interface (vnm, adj->rewrite_header.sw_if_index);
337 if (!(si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
343 ip4_interface_address_matching_destination (im,
344 &adj->sub_type.nbr.next_hop.
354 vlib_packet_template_get_packet (vm, &im->ip4_arp_request_packet_template,
359 hi = vnet_get_sup_hw_interface (vnm, adj->rewrite_header.sw_if_index);
361 clib_memcpy_fast (h->ip4_over_ethernet[0].ethernet,
363 sizeof (h->ip4_over_ethernet[0].ethernet));
365 h->ip4_over_ethernet[0].ip4 = src[0];
366 h->ip4_over_ethernet[1].ip4 = adj->sub_type.nbr.next_hop.ip4;
368 b = vlib_get_buffer (vm, bi);
369 vnet_buffer (b)->sw_if_index[VLIB_RX] =
370 vnet_buffer (b)->sw_if_index[VLIB_TX] = adj->rewrite_header.sw_if_index;
372 /* Add encapsulation string for software interface (e.g. ethernet header). */
373 vnet_rewrite_one_header (adj[0], h, sizeof (ethernet_header_t));
374 vlib_buffer_advance (b, -adj->rewrite_header.data_bytes);
377 vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index);
378 u32 *to_next = vlib_frame_vector_args (f);
381 vlib_put_frame_to_node (vm, hi->output_node_index, f);
386 arp_mk_complete (adj_index_t ai, ethernet_arp_ip4_entry_t * e)
388 adj_nbr_update_rewrite
389 (ai, ADJ_NBR_REWRITE_FLAG_COMPLETE,
390 ethernet_build_rewrite (vnet_get_main (),
392 adj_get_link_type (ai), e->ethernet_address));
396 arp_mk_incomplete (adj_index_t ai)
398 ip_adjacency_t *adj = adj_get (ai);
400 adj_nbr_update_rewrite
402 ADJ_NBR_REWRITE_FLAG_INCOMPLETE,
403 ethernet_build_rewrite (vnet_get_main (),
404 adj->rewrite_header.sw_if_index,
406 VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST));
409 static ethernet_arp_ip4_entry_t *
410 arp_entry_find (ethernet_arp_interface_t * eai, const ip4_address_t * addr)
412 ethernet_arp_main_t *am = ðernet_arp_main;
413 ethernet_arp_ip4_entry_t *e = NULL;
416 if (NULL != eai->arp_entries)
418 p = hash_get (eai->arp_entries, addr->as_u32);
422 e = pool_elt_at_index (am->ip4_entry_pool, p[0]);
429 arp_mk_complete_walk (adj_index_t ai, void *ctx)
431 ethernet_arp_ip4_entry_t *e = ctx;
433 arp_mk_complete (ai, e);
435 return (ADJ_WALK_RC_CONTINUE);
439 arp_mk_incomplete_walk (adj_index_t ai, void *ctx)
441 arp_mk_incomplete (ai);
443 return (ADJ_WALK_RC_CONTINUE);
447 arp_update_adjacency (vnet_main_t * vnm, u32 sw_if_index, u32 ai)
449 ethernet_arp_main_t *am = ðernet_arp_main;
450 ethernet_arp_interface_t *arp_int;
451 ethernet_arp_ip4_entry_t *e;
456 vec_validate (am->ethernet_arp_by_sw_if_index, sw_if_index);
457 arp_int = &am->ethernet_arp_by_sw_if_index[sw_if_index];
458 e = arp_entry_find (arp_int, &adj->sub_type.nbr.next_hop.ip4);
460 switch (adj->lookup_next_index)
462 case IP_LOOKUP_NEXT_GLEAN:
463 adj_glean_update_rewrite (ai);
465 case IP_LOOKUP_NEXT_ARP:
468 adj_nbr_walk_nh4 (sw_if_index,
469 &e->ip4_address, arp_mk_complete_walk, e);
474 * no matching ARP entry.
475 * construct the rewrite required to for an ARP packet, and stick
476 * that in the adj's pipe to smoke.
478 adj_nbr_update_rewrite
480 ADJ_NBR_REWRITE_FLAG_INCOMPLETE,
481 ethernet_build_rewrite
485 VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST));
488 * since the FIB has added this adj for a route, it makes sense it
489 * may want to forward traffic sometime soon. Let's send a
490 * speculative ARP. just one. If we were to do periodically that
491 * wouldn't be bad either, but that's more code than i'm prepared to
492 * write at this time for relatively little reward.
497 case IP_LOOKUP_NEXT_BCAST:
498 adj_nbr_update_rewrite (ai,
499 ADJ_NBR_REWRITE_FLAG_COMPLETE,
500 ethernet_build_rewrite
504 VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST));
506 case IP_LOOKUP_NEXT_MCAST:
509 * Construct a partial rewrite from the known ethernet mcast dest MAC
514 rewrite = ethernet_build_rewrite (vnm,
517 ethernet_ip4_mcast_dst_addr ());
518 offset = vec_len (rewrite) - 2;
521 * Complete the remaining fields of the adj's rewrite to direct the
522 * complete of the rewrite at switch time by copying in the IP
523 * dst address's bytes.
524 * Ofset is 2 bytes into the MAC desintation address.
526 adj_mcast_update_rewrite (ai, rewrite, offset);
530 case IP_LOOKUP_NEXT_DROP:
531 case IP_LOOKUP_NEXT_PUNT:
532 case IP_LOOKUP_NEXT_LOCAL:
533 case IP_LOOKUP_NEXT_REWRITE:
534 case IP_LOOKUP_NEXT_MCAST_MIDCHAIN:
535 case IP_LOOKUP_NEXT_MIDCHAIN:
536 case IP_LOOKUP_NEXT_ICMP_ERROR:
537 case IP_LOOKUP_N_NEXT:
544 arp_adj_fib_add (ethernet_arp_ip4_entry_t * e, u32 fib_index)
548 .fp_proto = FIB_PROTOCOL_IP4,
549 .fp_addr.ip4 = e->ip4_address,
553 fib_table_entry_path_add (fib_index, &pfx, FIB_SOURCE_ADJ,
554 FIB_ENTRY_FLAG_ATTACHED,
555 DPO_PROTO_IP4, &pfx.fp_addr,
556 e->sw_if_index, ~0, 1, NULL,
557 FIB_ROUTE_PATH_FLAG_NONE);
558 fib_table_lock (fib_index, FIB_PROTOCOL_IP4, FIB_SOURCE_ADJ);
562 arp_adj_fib_remove (ethernet_arp_ip4_entry_t * e, u32 fib_index)
564 if (FIB_NODE_INDEX_INVALID != e->fib_entry_index)
568 .fp_proto = FIB_PROTOCOL_IP4,
569 .fp_addr.ip4 = e->ip4_address,
573 fib_index = ip4_fib_table_get_index_for_sw_if_index (e->sw_if_index);
575 fib_table_entry_path_remove (fib_index, &pfx,
579 e->sw_if_index, ~0, 1,
580 FIB_ROUTE_PATH_FLAG_NONE);
581 fib_table_unlock (fib_index, FIB_PROTOCOL_IP4, FIB_SOURCE_ADJ);
585 static ethernet_arp_ip4_entry_t *
586 force_reuse_arp_entry (void)
588 ethernet_arp_ip4_entry_t *e;
589 ethernet_arp_main_t *am = ðernet_arp_main;
591 u32 index = pool_next_index (am->ip4_entry_pool, am->arp_delete_rotor);
592 if (index == ~0) /* Try again from elt 0 */
593 index = pool_next_index (am->ip4_entry_pool, index);
595 /* Find a non-static random entry to free up for reuse */
598 if ((count++ == 100) || (index == ~0))
599 return NULL; /* give up after 100 entries */
600 e = pool_elt_at_index (am->ip4_entry_pool, index);
601 am->arp_delete_rotor = index;
602 index = pool_next_index (am->ip4_entry_pool, index);
604 while (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC);
606 /* Remove ARP entry from its interface and update fib */
608 (am->ethernet_arp_by_sw_if_index[e->sw_if_index].arp_entries,
609 e->ip4_address.as_u32);
611 (e, ip4_fib_table_get_index_for_sw_if_index (e->sw_if_index));
612 adj_nbr_walk_nh4 (e->sw_if_index,
613 &e->ip4_address, arp_mk_incomplete_walk, e);
618 vnet_arp_set_ip4_over_ethernet_internal (vnet_main_t * vnm,
619 vnet_arp_set_ip4_over_ethernet_rpc_args_t
622 ethernet_arp_ip4_entry_t *e = 0;
623 ethernet_arp_main_t *am = ðernet_arp_main;
624 ethernet_arp_ip4_over_ethernet_address_t *a = &args->a;
625 vlib_main_t *vm = vlib_get_main ();
626 int make_new_arp_cache_entry = 1;
628 pending_resolution_t *pr, *mc;
629 ethernet_arp_interface_t *arp_int;
630 int is_static = args->is_static;
631 u32 sw_if_index = args->sw_if_index;
632 int is_no_fib_entry = args->is_no_fib_entry;
634 vec_validate (am->ethernet_arp_by_sw_if_index, sw_if_index);
636 arp_int = &am->ethernet_arp_by_sw_if_index[sw_if_index];
638 if (NULL != arp_int->arp_entries)
640 p = hash_get (arp_int->arp_entries, a->ip4.as_u32);
643 e = pool_elt_at_index (am->ip4_entry_pool, p[0]);
645 /* Refuse to over-write static arp. */
646 if (!is_static && (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC))
648 /* if MAC address match, still check to send event */
649 if (0 == memcmp (e->ethernet_address,
650 a->ethernet, sizeof (e->ethernet_address)))
651 goto check_customers;
654 make_new_arp_cache_entry = 0;
658 if (make_new_arp_cache_entry)
660 if (am->limit_arp_cache_size &&
661 pool_elts (am->ip4_entry_pool) >= am->limit_arp_cache_size)
663 e = force_reuse_arp_entry ();
668 pool_get (am->ip4_entry_pool, e);
670 if (NULL == arp_int->arp_entries)
671 arp_int->arp_entries = hash_create (0, sizeof (u32));
673 hash_set (arp_int->arp_entries, a->ip4.as_u32, e - am->ip4_entry_pool);
675 e->sw_if_index = sw_if_index;
676 e->ip4_address = a->ip4;
677 e->fib_entry_index = FIB_NODE_INDEX_INVALID;
678 clib_memcpy_fast (e->ethernet_address,
679 a->ethernet, sizeof (e->ethernet_address));
681 if (!is_no_fib_entry)
684 ip4_fib_table_get_index_for_sw_if_index
689 e->flags |= ETHERNET_ARP_IP4_ENTRY_FLAG_NO_FIB_ENTRY;
695 * prevent a DoS attack from the data-plane that
696 * spams us with no-op updates to the MAC address
698 if (0 == memcmp (e->ethernet_address,
699 a->ethernet, sizeof (e->ethernet_address)))
701 e->time_last_updated = vlib_time_now (vm);
702 goto check_customers;
705 /* Update ethernet address. */
706 clib_memcpy_fast (e->ethernet_address, a->ethernet,
707 sizeof (e->ethernet_address));
710 /* Update time stamp and flags. */
711 e->time_last_updated = vlib_time_now (vm);
714 e->flags &= ~ETHERNET_ARP_IP4_ENTRY_FLAG_DYNAMIC;
715 e->flags |= ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC;
719 e->flags &= ~ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC;
720 e->flags |= ETHERNET_ARP_IP4_ENTRY_FLAG_DYNAMIC;
723 adj_nbr_walk_nh4 (sw_if_index, &e->ip4_address, arp_mk_complete_walk, e);
726 /* Customer(s) waiting for this address to be resolved? */
727 p = hash_get (am->pending_resolutions_by_address, a->ip4.as_u32);
733 while (next_index != (u32) ~ 0)
735 pr = pool_elt_at_index (am->pending_resolutions, next_index);
736 vlib_process_signal_event (vm, pr->node_index,
737 pr->type_opaque, pr->data);
738 next_index = pr->next_index;
739 pool_put (am->pending_resolutions, pr);
742 hash_unset (am->pending_resolutions_by_address, a->ip4.as_u32);
745 /* Customer(s) requesting ARP event for this address? */
746 p = hash_get (am->mac_changes_by_address, a->ip4.as_u32);
752 while (next_index != (u32) ~ 0)
754 int (*fp) (u32, u8 *, u32, u32);
756 mc = pool_elt_at_index (am->mac_changes, next_index);
757 fp = mc->data_callback;
759 /* Call the user's data callback, return 1 to suppress dup events */
761 rv = (*fp) (mc->data, a->ethernet, sw_if_index, 0);
764 * Signal the resolver process, as long as the user
765 * says they want to be notified
768 vlib_process_signal_event (vm, mc->node_index,
769 mc->type_opaque, mc->data);
770 next_index = mc->next_index;
778 vnet_register_ip4_arp_resolution_event (vnet_main_t * vnm,
781 uword type_opaque, uword data)
783 ethernet_arp_main_t *am = ðernet_arp_main;
784 ip4_address_t *address = address_arg;
786 pending_resolution_t *pr;
788 pool_get (am->pending_resolutions, pr);
791 pr->node_index = node_index;
792 pr->type_opaque = type_opaque;
794 pr->data_callback = 0;
796 p = hash_get (am->pending_resolutions_by_address, address->as_u32);
799 /* Insert new resolution at the head of the list */
800 pr->next_index = p[0];
801 hash_unset (am->pending_resolutions_by_address, address->as_u32);
804 hash_set (am->pending_resolutions_by_address, address->as_u32,
805 pr - am->pending_resolutions);
809 vnet_add_del_ip4_arp_change_event (vnet_main_t * vnm,
814 uword type_opaque, uword data, int is_add)
816 ethernet_arp_main_t *am = ðernet_arp_main;
817 ip4_address_t *address = address_arg;
819 /* Try to find an existing entry */
820 u32 *first = (u32 *) hash_get (am->mac_changes_by_address, address->as_u32);
822 pending_resolution_t *mc;
823 while (p && *p != ~0)
825 mc = pool_elt_at_index (am->mac_changes, *p);
826 if (mc->node_index == node_index && mc->type_opaque == type_opaque
832 int found = p && *p != ~0;
836 return VNET_API_ERROR_ENTRY_ALREADY_EXISTS;
838 pool_get (am->mac_changes, mc);
839 *mc = (pending_resolution_t)
841 .next_index = ~0,.node_index = node_index,.type_opaque =
842 type_opaque,.data = data,.data_callback = data_callback,.pid =
845 /* Insert new resolution at the end of the list */
846 u32 new_idx = mc - am->mac_changes;
850 hash_set (am->mac_changes_by_address, address->as_u32, new_idx);
855 return VNET_API_ERROR_NO_SUCH_ENTRY;
857 /* Clients may need to clean up pool entries, too */
858 void (*fp) (u32, u8 *) = data_callback;
860 (*fp) (mc->data, 0 /* no new mac addrs */ );
862 /* Remove the entry from the list and delete the entry */
864 pool_put (am->mac_changes, mc);
866 /* Remove from hash if we deleted the last entry */
867 if (*p == ~0 && p == first)
868 hash_unset (am->mac_changes_by_address, address->as_u32);
873 /* Either we drop the packet or we send a reply to the sender. */
877 ARP_INPUT_NEXT_REPLY_TX,
881 #define foreach_ethernet_arp_error \
882 _ (replies_sent, "ARP replies sent") \
883 _ (l2_type_not_ethernet, "L2 type not ethernet") \
884 _ (l3_type_not_ip4, "L3 type not IP4") \
885 _ (l3_src_address_not_local, "IP4 source address not local to subnet") \
886 _ (l3_dst_address_not_local, "IP4 destination address not local to subnet") \
887 _ (l3_dst_address_unset, "IP4 destination address is unset") \
888 _ (l3_src_address_is_local, "IP4 source address matches local interface") \
889 _ (l3_src_address_learned, "ARP request IP4 source address learned") \
890 _ (replies_received, "ARP replies received") \
891 _ (opcode_not_request, "ARP opcode not request") \
892 _ (proxy_arp_replies_sent, "Proxy ARP replies sent") \
893 _ (l2_address_mismatch, "ARP hw addr does not match L2 frame src addr") \
894 _ (gratuitous_arp, "ARP probe or announcement dropped") \
895 _ (interface_no_table, "Interface is not mapped to an IP table") \
896 _ (interface_not_ip_enabled, "Interface is not IP enabled") \
900 #define _(sym,string) ETHERNET_ARP_ERROR_##sym,
901 foreach_ethernet_arp_error
903 ETHERNET_ARP_N_ERROR,
904 } ethernet_arp_input_error_t;
907 arp_unnumbered (vlib_buffer_t * p0,
908 u32 input_sw_if_index, u32 conn_sw_if_index)
910 vnet_main_t *vnm = vnet_get_main ();
911 vnet_interface_main_t *vim = &vnm->interface_main;
912 vnet_sw_interface_t *si;
914 /* verify that the input interface is unnumbered to the connected.
915 * the connected interface is the interface on which the subnet is
917 si = &vim->sw_interfaces[input_sw_if_index];
919 if (!(si->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED &&
920 (si->unnumbered_sw_if_index == conn_sw_if_index)))
922 /* the input interface is not unnumbered to the interface on which
923 * the sub-net is configured that covers the ARP request.
924 * So this is not the case for unnumbered.. */
932 arp_learn (vnet_main_t * vnm,
933 ethernet_arp_main_t * am, u32 sw_if_index,
934 const ethernet_arp_ip4_over_ethernet_address_t * addr)
936 vnet_arp_set_ip4_over_ethernet (vnm, sw_if_index, addr, 0, 0);
937 return (ETHERNET_ARP_ERROR_l3_src_address_learned);
941 arp_input (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
943 ethernet_arp_main_t *am = ðernet_arp_main;
944 vnet_main_t *vnm = vnet_get_main ();
945 ip4_main_t *im4 = &ip4_main;
946 u32 n_left_from, next_index, *from, *to_next;
947 u32 n_replies_sent = 0, n_proxy_arp_replies_sent = 0;
949 from = vlib_frame_vector_args (frame);
950 n_left_from = frame->n_vectors;
951 next_index = node->cached_next_index;
953 if (node->flags & VLIB_NODE_FLAG_TRACE)
954 vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
956 sizeof (ethernet_arp_input_trace_t));
958 while (n_left_from > 0)
962 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
964 while (n_left_from > 0 && n_left_to_next > 0)
967 vnet_hw_interface_t *hw_if0;
968 ethernet_arp_header_t *arp0;
969 ethernet_header_t *eth_rx, *eth_tx;
970 const ip4_address_t *if_addr0;
971 ip4_address_t proxy_src;
972 u32 pi0, error0, next0, sw_if_index0, conn_sw_if_index0, fib_index0;
973 u8 is_request0, dst_is_local0, is_unnum0, is_vrrp_reply0;
974 ethernet_proxy_arp_t *pa;
975 fib_node_index_t dst_fei, src_fei;
976 const fib_prefix_t *pfx0;
977 fib_entry_flag_t src_flags, dst_flags;
978 u8 *rewrite0, rewrite0_len;
988 p0 = vlib_get_buffer (vm, pi0);
989 arp0 = vlib_buffer_get_current (p0);
990 /* Fill in ethernet header. */
991 eth_rx = ethernet_buffer_get_header (p0);
993 is_request0 = arp0->opcode
994 == clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_request);
996 error0 = ETHERNET_ARP_ERROR_replies_sent;
1000 clib_net_to_host_u16 (ETHERNET_ARP_HARDWARE_TYPE_ethernet) ?
1001 ETHERNET_ARP_ERROR_l2_type_not_ethernet : error0);
1004 clib_net_to_host_u16 (ETHERNET_TYPE_IP4) ?
1005 ETHERNET_ARP_ERROR_l3_type_not_ip4 : error0);
1007 (0 == arp0->ip4_over_ethernet[0].ip4.as_u32 ?
1008 ETHERNET_ARP_ERROR_l3_dst_address_unset : error0);
1010 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
1012 /* not playing the ARP game if the interface is not IPv4 enabled */
1014 (im4->ip_enabled_by_sw_if_index[sw_if_index0] == 0 ?
1015 ETHERNET_ARP_ERROR_interface_not_ip_enabled : error0);
1020 /* Check that IP address is local and matches incoming interface. */
1021 fib_index0 = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);
1022 if (~0 == fib_index0)
1024 error0 = ETHERNET_ARP_ERROR_interface_no_table;
1028 dst_fei = ip4_fib_table_lookup (ip4_fib_get (fib_index0),
1029 &arp0->ip4_over_ethernet[1].ip4,
1031 dst_flags = fib_entry_get_flags (dst_fei);
1033 conn_sw_if_index0 = fib_entry_get_resolving_interface (dst_fei);
1035 /* Honor unnumbered interface, if any */
1036 is_unnum0 = sw_if_index0 != conn_sw_if_index0;
1040 * we're looking for FIB entries that indicate the source
1041 * is attached. There may be more specific non-attached
1042 * routes that match the source, but these do not influence
1043 * whether we respond to an ARP request, i.e. they do not
1044 * influence whether we are the correct way for the sender
1045 * to reach us, they only affect how we reach the sender.
1047 fib_entry_t *src_fib_entry;
1048 const fib_prefix_t *pfx;
1049 fib_entry_src_t *src;
1050 fib_source_t source;
1059 src_fei = ip4_fib_table_lookup (ip4_fib_get (fib_index0),
1061 ip4_over_ethernet[0].ip4,
1063 src_fib_entry = fib_entry_get (src_fei);
1066 * It's possible that the source that provides the
1067 * flags we need, or the flags we must not have,
1068 * is not the best source, so check then all.
1071 FOR_EACH_SRC_ADDED(src_fib_entry, src, source,
1073 src_flags = fib_entry_get_flags_for_source (src_fei, source);
1075 /* Reject requests/replies with our local interface
1077 if (FIB_ENTRY_FLAG_LOCAL & src_flags)
1079 error0 = ETHERNET_ARP_ERROR_l3_src_address_is_local;
1081 * When VPP has an interface whose address is also
1082 * applied to a TAP interface on the host, then VPP's
1083 * TAP interface will be unnumbered to the 'real'
1084 * interface and do proxy ARP from the host.
1085 * The curious aspect of this setup is that ARP requests
1086 * from the host will come from the VPP's own address.
1087 * So don't drop immediately here, instead go see if this
1088 * is a proxy ARP case.
1092 /* A Source must also be local to subnet of matching
1093 * interface address. */
1094 if ((FIB_ENTRY_FLAG_ATTACHED & src_flags) ||
1095 (FIB_ENTRY_FLAG_CONNECTED & src_flags))
1102 * The packet was sent from an address that is not
1103 * connected nor attached i.e. it is not from an
1104 * address that is covered by a link's sub-net,
1105 * nor is it a already learned host resp.
1111 * shorter mask lookup for the next iteration.
1113 pfx = fib_entry_get_prefix (src_fei);
1114 mask = pfx->fp_len - 1;
1117 * continue until we hit the default route or we find
1118 * the attached we are looking for. The most likely
1119 * outcome is we find the attached with the first source
1120 * on the first lookup.
1124 !fib_entry_is_sourced (src_fei, FIB_SOURCE_DEFAULT_ROUTE));
1129 * the matching route is a not attached, i.e. it was
1130 * added as a result of routing, rather than interface/ARP
1131 * configuration. If the matching route is not a host route
1134 error0 = ETHERNET_ARP_ERROR_l3_src_address_not_local;
1139 if (fib_entry_is_sourced (dst_fei, FIB_SOURCE_ADJ))
1142 * We matched an adj-fib on ths source subnet (a /32 previously
1143 * added as a result of ARP). If this request is a gratuitous
1144 * ARP, then learn from it.
1145 * The check for matching an adj-fib, is to prevent hosts
1146 * from spamming us with gratuitous ARPS that might otherwise
1147 * blow our ARP cache
1149 if (arp0->ip4_over_ethernet[0].ip4.as_u32 ==
1150 arp0->ip4_over_ethernet[1].ip4.as_u32)
1151 error0 = arp_learn (vnm, am, sw_if_index0,
1152 &arp0->ip4_over_ethernet[0]);
1155 else if (!(FIB_ENTRY_FLAG_CONNECTED & dst_flags))
1157 error0 = ETHERNET_ARP_ERROR_l3_dst_address_not_local;
1161 if (sw_if_index0 != fib_entry_get_resolving_interface (src_fei))
1164 * The interface the ARP was received on is not the interface
1165 * on which the covering prefix is configured. Maybe this is a
1166 * case for unnumbered.
1171 dst_is_local0 = (FIB_ENTRY_FLAG_LOCAL & dst_flags);
1172 pfx0 = fib_entry_get_prefix (dst_fei);
1173 if_addr0 = &pfx0->fp_addr.ip4;
1177 clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply))
1180 (arp0->ip4_over_ethernet[0].ethernet, vrrp_prefix,
1181 sizeof (vrrp_prefix))));
1183 /* Trash ARP packets whose ARP-level source addresses do not
1184 match their L2-frame-level source addresses, unless it's
1185 a reply from a VRRP virtual router */
1187 (eth_rx->src_address, arp0->ip4_over_ethernet[0].ethernet,
1188 sizeof (eth_rx->src_address)) && !is_vrrp_reply0)
1190 error0 = ETHERNET_ARP_ERROR_l2_address_mismatch;
1194 /* Learn or update sender's mapping only for replies to addresses
1195 * that are local to the subnet */
1197 clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply))
1200 error0 = arp_learn (vnm, am, sw_if_index0,
1201 &arp0->ip4_over_ethernet[0]);
1203 /* a reply for a non-local destination could be a GARP.
1204 * GARPs for hosts we know were handled above, so this one
1206 error0 = ETHERNET_ARP_ERROR_l3_dst_address_not_local;
1210 else if (arp0->opcode ==
1211 clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_request) &&
1212 (dst_is_local0 == 0))
1219 An adjacency to the sender is not always present,
1220 so we use the interface to build us a rewrite string
1221 which will contain all the necessary tags. */
1222 rewrite0 = ethernet_build_rewrite (vnm, sw_if_index0,
1224 eth_rx->src_address);
1225 rewrite0_len = vec_len (rewrite0);
1227 /* Figure out how much to rewind current data from adjacency. */
1228 vlib_buffer_advance (p0, -rewrite0_len);
1229 eth_tx = vlib_buffer_get_current (p0);
1231 vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
1232 hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
1234 /* Send reply back through input interface */
1235 vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
1236 next0 = ARP_INPUT_NEXT_REPLY_TX;
1238 arp0->opcode = clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply);
1240 arp0->ip4_over_ethernet[1] = arp0->ip4_over_ethernet[0];
1242 clib_memcpy_fast (arp0->ip4_over_ethernet[0].ethernet,
1243 hw_if0->hw_address, 6);
1244 clib_mem_unaligned (&arp0->ip4_over_ethernet[0].ip4.data_u32, u32) =
1247 /* Hardware must be ethernet-like. */
1248 ASSERT (vec_len (hw_if0->hw_address) == 6);
1250 /* the rx nd tx ethernet headers wil overlap in the case
1251 * when we received a tagged VLAN=0 packet, but we are sending
1253 clib_memcpy_fast (eth_tx, rewrite0, vec_len (rewrite0));
1254 vec_free (rewrite0);
1260 if (!arp_unnumbered (p0, sw_if_index0, conn_sw_if_index0))
1265 /* We are going to reply to this request, so, in the absence of
1266 errors, learn the sender */
1268 error0 = arp_learn (vnm, am, sw_if_index0,
1269 &arp0->ip4_over_ethernet[1]);
1271 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1272 n_left_to_next, pi0, next0);
1274 n_replies_sent += 1;
1278 if (arp0->ip4_over_ethernet[0].ip4.as_u32 ==
1279 arp0->ip4_over_ethernet[1].ip4.as_u32)
1281 error0 = ETHERNET_ARP_ERROR_gratuitous_arp;
1284 /* See if proxy arp is configured for the address */
1287 vnet_sw_interface_t *si;
1288 u32 this_addr = clib_net_to_host_u32
1289 (arp0->ip4_over_ethernet[1].ip4.as_u32);
1292 si = vnet_get_sw_interface (vnm, sw_if_index0);
1294 if (!(si->flags & VNET_SW_INTERFACE_FLAG_PROXY_ARP))
1297 fib_index0 = vec_elt (im4->fib_index_by_sw_if_index,
1300 vec_foreach (pa, am->proxy_arps)
1302 u32 lo_addr = clib_net_to_host_u32 (pa->lo_addr.as_u32);
1303 u32 hi_addr = clib_net_to_host_u32 (pa->hi_addr.as_u32);
1305 /* an ARP request hit in the proxy-arp table? */
1306 if ((this_addr >= lo_addr && this_addr <= hi_addr) &&
1307 (fib_index0 == pa->fib_index))
1310 arp0->ip4_over_ethernet[1].ip4.data_u32;
1313 * change the interface address to the proxied
1315 if_addr0 = &proxy_src;
1317 n_proxy_arp_replies_sent++;
1325 next0 = ARP_INPUT_NEXT_DROP;
1326 p0->error = node->errors[error0];
1328 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1329 n_left_to_next, pi0, next0);
1332 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1335 vlib_error_count (vm, node->node_index,
1336 ETHERNET_ARP_ERROR_replies_sent,
1337 n_replies_sent - n_proxy_arp_replies_sent);
1339 vlib_error_count (vm, node->node_index,
1340 ETHERNET_ARP_ERROR_proxy_arp_replies_sent,
1341 n_proxy_arp_replies_sent);
1342 return frame->n_vectors;
1345 static char *ethernet_arp_error_strings[] = {
1346 #define _(sym,string) string,
1347 foreach_ethernet_arp_error
1352 VLIB_REGISTER_NODE (arp_input_node, static) =
1354 .function = arp_input,
1355 .name = "arp-input",
1356 .vector_size = sizeof (u32),
1357 .n_errors = ETHERNET_ARP_N_ERROR,
1358 .error_strings = ethernet_arp_error_strings,
1359 .n_next_nodes = ARP_INPUT_N_NEXT,
1361 [ARP_INPUT_NEXT_DROP] = "error-drop",
1362 [ARP_INPUT_NEXT_REPLY_TX] = "interface-output",
1364 .format_buffer = format_ethernet_arp_header,
1365 .format_trace = format_ethernet_arp_input_trace,
1370 ip4_arp_entry_sort (void *a1, void *a2)
1372 ethernet_arp_ip4_entry_t *e1 = a1;
1373 ethernet_arp_ip4_entry_t *e2 = a2;
1376 vnet_main_t *vnm = vnet_get_main ();
1378 cmp = vnet_sw_interface_compare (vnm, e1->sw_if_index, e2->sw_if_index);
1380 cmp = ip4_address_compare (&e1->ip4_address, &e2->ip4_address);
1384 ethernet_arp_ip4_entry_t *
1385 ip4_neighbors_pool (void)
1387 ethernet_arp_main_t *am = ðernet_arp_main;
1388 return am->ip4_entry_pool;
1391 ethernet_arp_ip4_entry_t *
1392 ip4_neighbor_entries (u32 sw_if_index)
1394 ethernet_arp_main_t *am = ðernet_arp_main;
1395 ethernet_arp_ip4_entry_t *n, *ns = 0;
1398 pool_foreach (n, am->ip4_entry_pool, ({
1399 if (sw_if_index != ~0 && n->sw_if_index != sw_if_index)
1401 vec_add1 (ns, n[0]);
1406 vec_sort_with_function (ns, ip4_arp_entry_sort);
1410 static clib_error_t *
1411 show_ip4_arp (vlib_main_t * vm,
1412 unformat_input_t * input, vlib_cli_command_t * cmd)
1414 vnet_main_t *vnm = vnet_get_main ();
1415 ethernet_arp_main_t *am = ðernet_arp_main;
1416 ethernet_arp_ip4_entry_t *e, *es;
1417 ethernet_proxy_arp_t *pa;
1418 clib_error_t *error = 0;
1421 /* Filter entries by interface if given. */
1423 (void) unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index);
1425 es = ip4_neighbor_entries (sw_if_index);
1428 vlib_cli_output (vm, "%U", format_ethernet_arp_ip4_entry, vnm, 0);
1431 vlib_cli_output (vm, "%U", format_ethernet_arp_ip4_entry, vnm, e);
1436 if (vec_len (am->proxy_arps))
1438 vlib_cli_output (vm, "Proxy arps enabled for:");
1439 vec_foreach (pa, am->proxy_arps)
1441 vlib_cli_output (vm, "Fib_index %d %U - %U ",
1443 format_ip4_address, &pa->lo_addr,
1444 format_ip4_address, &pa->hi_addr);
1452 * Display all the IPv4 ARP entries.
1455 * Example of how to display the IPv4 ARP table:
1456 * @cliexstart{show ip arp}
1457 * Time FIB IP4 Flags Ethernet Interface
1458 * 346.3028 0 6.1.1.3 de:ad:be:ef:ba:be GigabitEthernet2/0/0
1459 * 3077.4271 0 6.1.1.4 S de:ad:be:ef:ff:ff GigabitEthernet2/0/0
1460 * 2998.6409 1 6.2.2.3 de:ad:be:ef:00:01 GigabitEthernet2/0/0
1461 * Proxy arps enabled for:
1462 * Fib_index 0 6.0.0.1 - 6.0.0.11
1466 VLIB_CLI_COMMAND (show_ip4_arp_command, static) = {
1467 .path = "show ip arp",
1468 .function = show_ip4_arp,
1469 .short_help = "show ip arp",
1475 pg_edit_t l2_type, l3_type;
1476 pg_edit_t n_l2_address_bytes, n_l3_address_bytes;
1482 } ip4_over_ethernet[2];
1483 } pg_ethernet_arp_header_t;
1486 pg_ethernet_arp_header_init (pg_ethernet_arp_header_t * p)
1488 /* Initialize fields that are not bit fields in the IP header. */
1489 #define _(f) pg_edit_init (&p->f, ethernet_arp_header_t, f);
1492 _(n_l2_address_bytes);
1493 _(n_l3_address_bytes);
1495 _(ip4_over_ethernet[0].ethernet);
1496 _(ip4_over_ethernet[0].ip4);
1497 _(ip4_over_ethernet[1].ethernet);
1498 _(ip4_over_ethernet[1].ip4);
1503 unformat_pg_arp_header (unformat_input_t * input, va_list * args)
1505 pg_stream_t *s = va_arg (*args, pg_stream_t *);
1506 pg_ethernet_arp_header_t *p;
1509 p = pg_create_edit_group (s, sizeof (p[0]), sizeof (ethernet_arp_header_t),
1511 pg_ethernet_arp_header_init (p);
1514 pg_edit_set_fixed (&p->l2_type, ETHERNET_ARP_HARDWARE_TYPE_ethernet);
1515 pg_edit_set_fixed (&p->l3_type, ETHERNET_TYPE_IP4);
1516 pg_edit_set_fixed (&p->n_l2_address_bytes, 6);
1517 pg_edit_set_fixed (&p->n_l3_address_bytes, 4);
1519 if (!unformat (input, "%U: %U/%U -> %U/%U",
1521 unformat_ethernet_arp_opcode_net_byte_order, &p->opcode,
1523 unformat_ethernet_address, &p->ip4_over_ethernet[0].ethernet,
1525 unformat_ip4_address, &p->ip4_over_ethernet[0].ip4,
1527 unformat_ethernet_address, &p->ip4_over_ethernet[1].ethernet,
1529 unformat_ip4_address, &p->ip4_over_ethernet[1].ip4))
1531 /* Free up any edits we may have added. */
1532 pg_free_edit_group (s);
1539 ip4_set_arp_limit (u32 arp_limit)
1541 ethernet_arp_main_t *am = ðernet_arp_main;
1543 am->limit_arp_cache_size = arp_limit;
1548 * @brief Control Plane hook to remove an ARP entry
1551 vnet_arp_unset_ip4_over_ethernet (vnet_main_t * vnm,
1554 ethernet_arp_ip4_over_ethernet_address_t *
1557 vnet_arp_set_ip4_over_ethernet_rpc_args_t args;
1559 args.sw_if_index = sw_if_index;
1560 args.flags = ETHERNET_ARP_ARGS_REMOVE;
1561 clib_memcpy_fast (&args.a, a, sizeof (*a));
1563 vl_api_rpc_call_main_thread (set_ip4_over_ethernet_rpc_callback,
1564 (u8 *) & args, sizeof (args));
1569 * @brief publish wildcard arp event
1570 * @param sw_if_index The interface on which the ARP entires are acted
1573 vnet_arp_wc_publish (u32 sw_if_index,
1574 const ethernet_arp_ip4_over_ethernet_address_t * a)
1576 vnet_arp_set_ip4_over_ethernet_rpc_args_t args = {
1577 .flags = ETHERNET_ARP_ARGS_WC_PUB,
1578 .sw_if_index = sw_if_index,
1582 vl_api_rpc_call_main_thread (set_ip4_over_ethernet_rpc_callback,
1583 (u8 *) & args, sizeof (args));
1588 vnet_arp_wc_publish_internal (vnet_main_t * vnm,
1589 vnet_arp_set_ip4_over_ethernet_rpc_args_t *
1592 vlib_main_t *vm = vlib_get_main ();
1593 ethernet_arp_main_t *am = ðernet_arp_main;
1594 uword ni = am->wc_ip4_arp_publisher_node;
1595 uword et = am->wc_ip4_arp_publisher_et;
1597 if (ni == (uword) ~ 0)
1599 wc_arp_report_t *r =
1600 vlib_process_signal_event_data (vm, ni, et, 1, sizeof *r);
1601 r->ip4 = args->a.ip4.as_u32;
1602 r->sw_if_index = args->sw_if_index;
1603 memcpy (r->mac, args->a.ethernet, sizeof r->mac);
1607 wc_arp_set_publisher_node (uword node_index, uword event_type)
1609 ethernet_arp_main_t *am = ðernet_arp_main;
1610 am->wc_ip4_arp_publisher_node = node_index;
1611 am->wc_ip4_arp_publisher_et = event_type;
1615 arp_entry_free (ethernet_arp_interface_t * eai, ethernet_arp_ip4_entry_t * e);
1618 vnet_arp_flush_ip4_over_ethernet_internal (vnet_main_t * vnm,
1619 vnet_arp_set_ip4_over_ethernet_rpc_args_t
1622 ethernet_arp_main_t *am = ðernet_arp_main;
1623 ethernet_arp_ip4_entry_t *e;
1624 ethernet_arp_interface_t *eai;
1626 if (vec_len (am->ethernet_arp_by_sw_if_index) <= args->sw_if_index)
1629 eai = &am->ethernet_arp_by_sw_if_index[args->sw_if_index];
1631 e = arp_entry_find (eai, &args->a.ip4);
1635 adj_nbr_walk_nh4 (e->sw_if_index,
1636 &e->ip4_address, arp_mk_incomplete_walk, e);
1639 * The difference between flush and unset, is that an unset
1640 * means delete for static and dynamic entries. A flush
1641 * means delete only for dynamic. Flushing is what the DP
1642 * does in response to interface events. unset is only done
1643 * by the control plane.
1645 if (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC)
1647 e->flags &= ~ETHERNET_ARP_IP4_ENTRY_FLAG_DYNAMIC;
1649 else if (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_DYNAMIC)
1651 arp_entry_free (eai, e);
1658 * arp_add_del_interface_address
1660 * callback when an interface address is added or deleted
1663 arp_add_del_interface_address (ip4_main_t * im,
1666 ip4_address_t * address,
1668 u32 if_address_index, u32 is_del)
1671 * Flush the ARP cache of all entries covered by the address
1672 * that is being removed.
1674 ethernet_arp_main_t *am = ðernet_arp_main;
1675 ethernet_arp_ip4_entry_t *e;
1677 if (vec_len (am->ethernet_arp_by_sw_if_index) <= sw_if_index)
1682 ethernet_arp_interface_t *eai;
1683 u32 i, *to_delete = 0;
1686 eai = &am->ethernet_arp_by_sw_if_index[sw_if_index];
1689 hash_foreach_pair (pair, eai->arp_entries,
1691 e = pool_elt_at_index(am->ip4_entry_pool,
1693 if (ip4_destination_matches_route (im, &e->ip4_address,
1694 address, address_length))
1696 vec_add1 (to_delete, e - am->ip4_entry_pool);
1701 for (i = 0; i < vec_len (to_delete); i++)
1703 e = pool_elt_at_index (am->ip4_entry_pool, to_delete[i]);
1705 vnet_arp_set_ip4_over_ethernet_rpc_args_t delme = {
1706 .a.ip4.as_u32 = e->ip4_address.as_u32,
1707 .sw_if_index = e->sw_if_index,
1708 .flags = ETHERNET_ARP_ARGS_FLUSH,
1710 clib_memcpy_fast (&delme.a.ethernet, e->ethernet_address, 6);
1712 vnet_arp_flush_ip4_over_ethernet_internal (vnet_get_main (),
1716 vec_free (to_delete);
1721 arp_table_bind (ip4_main_t * im,
1723 u32 sw_if_index, u32 new_fib_index, u32 old_fib_index)
1725 ethernet_arp_main_t *am = ðernet_arp_main;
1726 ethernet_arp_interface_t *eai;
1727 ethernet_arp_ip4_entry_t *e;
1731 * the IP table that the interface is bound to has changed.
1732 * reinstall all the adj fibs.
1735 if (vec_len (am->ethernet_arp_by_sw_if_index) <= sw_if_index)
1738 eai = &am->ethernet_arp_by_sw_if_index[sw_if_index];
1741 hash_foreach_pair (pair, eai->arp_entries,
1743 e = pool_elt_at_index(am->ip4_entry_pool,
1746 * remove the adj-fib from the old table and add to the new
1748 arp_adj_fib_remove(e, old_fib_index);
1749 arp_adj_fib_add(e, new_fib_index);
1755 static clib_error_t *
1756 ethernet_arp_init (vlib_main_t * vm)
1758 ethernet_arp_main_t *am = ðernet_arp_main;
1759 ip4_main_t *im = &ip4_main;
1760 clib_error_t *error;
1763 if ((error = vlib_call_init_function (vm, ethernet_init)))
1766 ethernet_register_input_type (vm, ETHERNET_TYPE_ARP, arp_input_node.index);
1768 pn = pg_get_node (arp_input_node.index);
1769 pn->unformat_edit = unformat_pg_arp_header;
1771 am->opcode_by_name = hash_create_string (0, sizeof (uword));
1772 #define _(o) hash_set_mem (am->opcode_by_name, #o, ETHERNET_ARP_OPCODE_##o);
1773 foreach_ethernet_arp_opcode;
1776 /* $$$ configurable */
1777 am->limit_arp_cache_size = 50000;
1779 am->pending_resolutions_by_address = hash_create (0, sizeof (uword));
1780 am->mac_changes_by_address = hash_create (0, sizeof (uword));
1781 am->wc_ip4_arp_publisher_node = (uword) ~ 0;
1783 /* don't trace ARP error packets */
1785 vlib_node_runtime_t *rt =
1786 vlib_node_get_runtime (vm, arp_input_node.index);
1789 vnet_pcap_drop_trace_filter_add_del \
1790 (rt->errors[ETHERNET_ARP_ERROR_##a], \
1792 foreach_ethernet_arp_error
1796 ip4_add_del_interface_address_callback_t cb;
1797 cb.function = arp_add_del_interface_address;
1798 cb.function_opaque = 0;
1799 vec_add1 (im->add_del_interface_address_callbacks, cb);
1801 ip4_table_bind_callback_t cbt;
1802 cbt.function = arp_table_bind;
1803 cbt.function_opaque = 0;
1804 vec_add1 (im->table_bind_callbacks, cbt);
1809 VLIB_INIT_FUNCTION (ethernet_arp_init);
1812 arp_entry_free (ethernet_arp_interface_t * eai, ethernet_arp_ip4_entry_t * e)
1814 ethernet_arp_main_t *am = ðernet_arp_main;
1817 (e, ip4_fib_table_get_index_for_sw_if_index (e->sw_if_index));
1818 hash_unset (eai->arp_entries, e->ip4_address.as_u32);
1819 pool_put (am->ip4_entry_pool, e);
1823 vnet_arp_unset_ip4_over_ethernet_internal (vnet_main_t * vnm,
1824 vnet_arp_set_ip4_over_ethernet_rpc_args_t
1827 ethernet_arp_main_t *am = ðernet_arp_main;
1828 ethernet_arp_ip4_entry_t *e;
1829 ethernet_arp_interface_t *eai;
1831 if (vec_len (am->ethernet_arp_by_sw_if_index) <= args->sw_if_index)
1834 eai = &am->ethernet_arp_by_sw_if_index[args->sw_if_index];
1836 e = arp_entry_find (eai, &args->a.ip4);
1840 adj_nbr_walk_nh4 (e->sw_if_index,
1841 &e->ip4_address, arp_mk_incomplete_walk, e);
1842 arp_entry_free (eai, e);
1850 vnet_arp_populate_ip4_over_ethernet_internal (vnet_main_t * vnm,
1851 vnet_arp_set_ip4_over_ethernet_rpc_args_t
1854 ethernet_arp_main_t *am = ðernet_arp_main;
1855 ethernet_arp_ip4_entry_t *e;
1856 ethernet_arp_interface_t *eai;
1858 vec_validate (am->ethernet_arp_by_sw_if_index, args->sw_if_index);
1859 eai = &am->ethernet_arp_by_sw_if_index[args->sw_if_index];
1861 e = arp_entry_find (eai, &args->a.ip4);
1865 adj_nbr_walk_nh4 (e->sw_if_index,
1866 &e->ip4_address, arp_mk_complete_walk, e);
1872 set_ip4_over_ethernet_rpc_callback (vnet_arp_set_ip4_over_ethernet_rpc_args_t
1875 vnet_main_t *vm = vnet_get_main ();
1876 ASSERT (vlib_get_thread_index () == 0);
1878 if (a->flags & ETHERNET_ARP_ARGS_REMOVE)
1879 vnet_arp_unset_ip4_over_ethernet_internal (vm, a);
1880 else if (a->flags & ETHERNET_ARP_ARGS_FLUSH)
1881 vnet_arp_flush_ip4_over_ethernet_internal (vm, a);
1882 else if (a->flags & ETHERNET_ARP_ARGS_POPULATE)
1883 vnet_arp_populate_ip4_over_ethernet_internal (vm, a);
1884 else if (a->flags & ETHERNET_ARP_ARGS_WC_PUB)
1885 vnet_arp_wc_publish_internal (vm, a);
1887 vnet_arp_set_ip4_over_ethernet_internal (vm, a);
1891 * @brief Invoked when the interface's admin state changes
1893 static clib_error_t *
1894 ethernet_arp_sw_interface_up_down (vnet_main_t * vnm,
1895 u32 sw_if_index, u32 flags)
1897 ethernet_arp_main_t *am = ðernet_arp_main;
1898 ethernet_arp_ip4_entry_t *e;
1899 u32 i, *to_update = 0;
1902 pool_foreach (e, am->ip4_entry_pool,
1904 if (e->sw_if_index == sw_if_index)
1905 vec_add1 (to_update,
1906 e - am->ip4_entry_pool);
1910 for (i = 0; i < vec_len (to_update); i++)
1912 e = pool_elt_at_index (am->ip4_entry_pool, to_update[i]);
1914 vnet_arp_set_ip4_over_ethernet_rpc_args_t update_me = {
1915 .a.ip4.as_u32 = e->ip4_address.as_u32,
1916 .sw_if_index = e->sw_if_index,
1919 clib_memcpy_fast (&update_me.a.ethernet, e->ethernet_address, 6);
1921 if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
1923 update_me.flags = ETHERNET_ARP_ARGS_POPULATE;
1924 vnet_arp_populate_ip4_over_ethernet_internal (vnm, &update_me);
1928 update_me.flags = ETHERNET_ARP_ARGS_FLUSH;
1929 vnet_arp_flush_ip4_over_ethernet_internal (vnm, &update_me);
1932 vec_free (to_update);
1937 VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (ethernet_arp_sw_interface_up_down);
1940 increment_ip4_and_mac_address (ethernet_arp_ip4_over_ethernet_address_t * a)
1945 for (i = 3; i >= 0; i--)
1947 old = a->ip4.as_u8[i];
1948 a->ip4.as_u8[i] += 1;
1949 if (old < a->ip4.as_u8[i])
1953 for (i = 5; i >= 0; i--)
1955 old = a->ethernet[i];
1956 a->ethernet[i] += 1;
1957 if (old < a->ethernet[i])
1963 vnet_arp_set_ip4_over_ethernet (vnet_main_t * vnm,
1965 const ethernet_arp_ip4_over_ethernet_address_t
1966 * a, int is_static, int is_no_fib_entry)
1968 vnet_arp_set_ip4_over_ethernet_rpc_args_t args;
1970 args.sw_if_index = sw_if_index;
1971 args.is_static = is_static;
1972 args.is_no_fib_entry = is_no_fib_entry;
1974 clib_memcpy_fast (&args.a, a, sizeof (*a));
1976 vl_api_rpc_call_main_thread (set_ip4_over_ethernet_rpc_callback,
1977 (u8 *) & args, sizeof (args));
1982 proxy_arp_walk (proxy_arp_walk_t cb, void *data)
1984 ethernet_arp_main_t *am = ðernet_arp_main;
1985 ethernet_proxy_arp_t *pa;
1987 vec_foreach (pa, am->proxy_arps)
1989 if (!cb (&pa->lo_addr, &pa->hi_addr, pa->fib_index, data))
1995 vnet_proxy_arp_add_del (ip4_address_t * lo_addr,
1996 ip4_address_t * hi_addr, u32 fib_index, int is_del)
1998 ethernet_arp_main_t *am = ðernet_arp_main;
1999 ethernet_proxy_arp_t *pa;
2000 u32 found_at_index = ~0;
2002 vec_foreach (pa, am->proxy_arps)
2004 if (pa->lo_addr.as_u32 == lo_addr->as_u32 &&
2005 pa->hi_addr.as_u32 == hi_addr->as_u32 && pa->fib_index == fib_index)
2007 found_at_index = pa - am->proxy_arps;
2012 if (found_at_index != ~0)
2014 /* Delete, otherwise it's already in the table */
2016 vec_delete (am->proxy_arps, 1, found_at_index);
2019 /* delete, no such entry */
2021 return VNET_API_ERROR_NO_SUCH_ENTRY;
2023 /* add, not in table */
2024 vec_add2 (am->proxy_arps, pa, 1);
2025 pa->lo_addr.as_u32 = lo_addr->as_u32;
2026 pa->hi_addr.as_u32 = hi_addr->as_u32;
2027 pa->fib_index = fib_index;
2032 * Remove any proxy arp entries asdociated with the
2036 vnet_proxy_arp_fib_reset (u32 fib_id)
2038 ethernet_arp_main_t *am = ðernet_arp_main;
2039 ethernet_proxy_arp_t *pa;
2040 u32 *entries_to_delete = 0;
2044 fib_index = fib_table_find (FIB_PROTOCOL_IP4, fib_id);
2045 if (~0 == fib_index)
2046 return VNET_API_ERROR_NO_SUCH_ENTRY;
2048 vec_foreach (pa, am->proxy_arps)
2050 if (pa->fib_index == fib_index)
2052 vec_add1 (entries_to_delete, pa - am->proxy_arps);
2056 for (i = 0; i < vec_len (entries_to_delete); i++)
2058 vec_delete (am->proxy_arps, 1, entries_to_delete[i]);
2061 vec_free (entries_to_delete);
2066 static clib_error_t *
2067 ip_arp_add_del_command_fn (vlib_main_t * vm,
2068 unformat_input_t * input, vlib_cli_command_t * cmd)
2070 vnet_main_t *vnm = vnet_get_main ();
2072 ethernet_arp_ip4_over_ethernet_address_t lo_addr, hi_addr, addr;
2079 int is_no_fib_entry = 0;
2082 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2084 /* set ip arp TenGigE1/1/0/1 1.2.3.4 aa:bb:... or aabb.ccdd... */
2085 if (unformat (input, "%U %U %U",
2086 unformat_vnet_sw_interface, vnm, &sw_if_index,
2087 unformat_ip4_address, &addr.ip4,
2088 unformat_ethernet_address, &addr.ethernet))
2091 else if (unformat (input, "delete") || unformat (input, "del"))
2094 else if (unformat (input, "static"))
2097 else if (unformat (input, "no-fib-entry"))
2098 is_no_fib_entry = 1;
2100 else if (unformat (input, "count %d", &count))
2103 else if (unformat (input, "fib-id %d", &fib_id))
2105 fib_index = fib_table_find (FIB_PROTOCOL_IP4, fib_id);
2107 if (~0 == fib_index)
2108 return clib_error_return (0, "fib ID %d doesn't exist\n", fib_id);
2111 else if (unformat (input, "proxy %U - %U",
2112 unformat_ip4_address, &lo_addr.ip4,
2113 unformat_ip4_address, &hi_addr.ip4))
2121 (void) vnet_proxy_arp_add_del (&lo_addr.ip4, &hi_addr.ip4,
2130 for (i = 0; i < count; i++)
2134 uword event_type, *event_data = 0;
2136 /* Park the debug CLI until the arp entry is installed */
2137 vnet_register_ip4_arp_resolution_event
2138 (vnm, &addr.ip4, vlib_current_process (vm),
2139 1 /* type */ , 0 /* data */ );
2141 vnet_arp_set_ip4_over_ethernet
2142 (vnm, sw_if_index, &addr, is_static, is_no_fib_entry);
2144 vlib_process_wait_for_event (vm);
2145 event_type = vlib_process_get_events (vm, &event_data);
2146 vec_reset_length (event_data);
2147 if (event_type != 1)
2148 clib_warning ("event type %d unexpected", event_type);
2151 vnet_arp_unset_ip4_over_ethernet (vnm, sw_if_index, &addr);
2153 increment_ip4_and_mac_address (&addr);
2158 return clib_error_return (0, "unknown input `%U'",
2159 format_unformat_error, input);
2167 * Add or delete IPv4 ARP cache entries.
2169 * @note 'set ip arp' options (e.g. delete, static, 'fib-id <id>',
2170 * 'count <number>', 'interface ip4_addr mac_addr') can be added in
2171 * any order and combination.
2175 * Add or delete IPv4 ARP cache entries as follows. MAC Address can be in
2176 * either aa:bb:cc:dd:ee:ff format or aabb.ccdd.eeff format.
2177 * @cliexcmd{set ip arp GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2178 * @cliexcmd{set ip arp delete GigabitEthernet2/0/0 6.0.0.3 de:ad:be:ef:ba:be}
2180 * To add or delete an IPv4 ARP cache entry to or from a specific fib
2182 * @cliexcmd{set ip arp fib-id 1 GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2183 * @cliexcmd{set ip arp fib-id 1 delete GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2185 * Add or delete IPv4 static ARP cache entries as follows:
2186 * @cliexcmd{set ip arp static GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2187 * @cliexcmd{set ip arp static delete GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2189 * For testing / debugging purposes, the 'set ip arp' command can add or
2190 * delete multiple entries. Supply the 'count N' parameter:
2191 * @cliexcmd{set ip arp count 10 GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2194 VLIB_CLI_COMMAND (ip_arp_add_del_command, static) = {
2195 .path = "set ip arp",
2197 "set ip arp [del] <intfc> <ip-address> <mac-address> [static] [no-fib-entry] [count <count>] [fib-id <fib-id>] [proxy <lo-addr> - <hi-addr>]",
2198 .function = ip_arp_add_del_command_fn,
2202 static clib_error_t *
2203 set_int_proxy_arp_command_fn (vlib_main_t * vm,
2205 input, vlib_cli_command_t * cmd)
2207 vnet_main_t *vnm = vnet_get_main ();
2209 vnet_sw_interface_t *si;
2213 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2215 if (unformat (input, "%U", unformat_vnet_sw_interface,
2218 else if (unformat (input, "enable") || unformat (input, "on"))
2220 else if (unformat (input, "disable") || unformat (input, "off"))
2227 return clib_error_return (0, "unknown input '%U'",
2228 format_unformat_error, input);
2230 si = vnet_get_sw_interface (vnm, sw_if_index);
2233 si->flags |= VNET_SW_INTERFACE_FLAG_PROXY_ARP;
2235 si->flags &= ~VNET_SW_INTERFACE_FLAG_PROXY_ARP;
2242 * Enable proxy-arp on an interface. The vpp stack will answer ARP
2243 * requests for the indicated address range. Multiple proxy-arp
2244 * ranges may be provisioned.
2246 * @note Proxy ARP as a technology is infamous for blackholing traffic.
2247 * Also, the underlying implementation has not been performance-tuned.
2248 * Avoid creating an unnecessarily large set of ranges.
2251 * To enable proxy arp on a range of addresses, use:
2252 * @cliexcmd{set ip arp proxy 6.0.0.1 - 6.0.0.11}
2253 * Append 'del' to delete a range of proxy ARP addresses:
2254 * @cliexcmd{set ip arp proxy 6.0.0.1 - 6.0.0.11 del}
2255 * You must then specifically enable proxy arp on individual interfaces:
2256 * @cliexcmd{set interface proxy-arp GigabitEthernet0/8/0 enable}
2257 * To disable proxy arp on an individual interface:
2258 * @cliexcmd{set interface proxy-arp GigabitEthernet0/8/0 disable}
2260 VLIB_CLI_COMMAND (set_int_proxy_enable_command, static) = {
2261 .path = "set interface proxy-arp",
2263 "set interface proxy-arp <intfc> [enable|disable]",
2264 .function = set_int_proxy_arp_command_fn,
2270 * ARP/ND Termination in a L2 Bridge Domain based on IP4/IP6 to MAC
2271 * hash tables mac_by_ip4 and mac_by_ip6 for each BD.
2275 ARP_TERM_NEXT_L2_OUTPUT,
2280 u32 arp_term_next_node_index[32];
2283 arp_term_l2bd (vlib_main_t * vm,
2284 vlib_node_runtime_t * node, vlib_frame_t * frame)
2286 l2input_main_t *l2im = &l2input_main;
2287 u32 n_left_from, next_index, *from, *to_next;
2288 u32 n_replies_sent = 0;
2289 u16 last_bd_index = ~0;
2290 l2_bridge_domain_t *last_bd_config = 0;
2291 l2_input_config_t *cfg0;
2293 from = vlib_frame_vector_args (frame);
2294 n_left_from = frame->n_vectors;
2295 next_index = node->cached_next_index;
2297 while (n_left_from > 0)
2301 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2303 while (n_left_from > 0 && n_left_to_next > 0)
2306 ethernet_header_t *eth0;
2307 ethernet_arp_header_t *arp0;
2310 u32 pi0, error0, next0, sw_if_index0;
2321 n_left_to_next -= 1;
2323 p0 = vlib_get_buffer (vm, pi0);
2324 // Terminate only local (SHG == 0) ARP
2325 if (vnet_buffer (p0)->l2.shg != 0)
2326 goto next_l2_feature;
2328 eth0 = vlib_buffer_get_current (p0);
2329 l3h0 = (u8 *) eth0 + vnet_buffer (p0)->l2.l2_len;
2330 ethertype0 = clib_net_to_host_u16 (*(u16 *) (l3h0 - 2));
2331 arp0 = (ethernet_arp_header_t *) l3h0;
2333 if (ethertype0 != ETHERNET_TYPE_ARP)
2336 if ((arp0->opcode !=
2337 clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_request)) &&
2339 clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply)))
2342 /* Must be ARP request/reply packet here */
2343 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) &&
2344 (p0->flags & VLIB_BUFFER_IS_TRACED)))
2346 u8 *t0 = vlib_add_trace (vm, node, p0,
2347 sizeof (ethernet_arp_input_trace_t));
2348 clib_memcpy_fast (t0, l3h0,
2349 sizeof (ethernet_arp_input_trace_t));
2355 clib_net_to_host_u16 (ETHERNET_ARP_HARDWARE_TYPE_ethernet)
2356 ? ETHERNET_ARP_ERROR_l2_type_not_ethernet : error0);
2359 clib_net_to_host_u16 (ETHERNET_TYPE_IP4) ?
2360 ETHERNET_ARP_ERROR_l3_type_not_ip4 : error0);
2362 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
2367 /* Trash ARP packets whose ARP-level source addresses do not
2368 match, or if requester address is mcast */
2370 (memcmp (eth0->src_address, arp0->ip4_over_ethernet[0].ethernet,
2371 sizeof (eth0->src_address)) ||
2372 ethernet_address_cast (arp0->ip4_over_ethernet[0].ethernet)))
2374 /* VRRP virtual MAC may be different to SMAC in ARP reply */
2375 if (memcmp (arp0->ip4_over_ethernet[0].ethernet, vrrp_prefix,
2376 sizeof (vrrp_prefix)))
2378 error0 = ETHERNET_ARP_ERROR_l2_address_mismatch;
2383 (ip4_address_is_multicast (&arp0->ip4_over_ethernet[0].ip4)))
2385 error0 = ETHERNET_ARP_ERROR_l3_src_address_not_local;
2389 /* Check if anyone want ARP request events for L2 BDs */
2391 ethernet_arp_main_t *am = ðernet_arp_main;
2392 if (am->wc_ip4_arp_publisher_node != (uword) ~ 0)
2393 vnet_arp_wc_publish (sw_if_index0, &arp0->ip4_over_ethernet[0]);
2396 /* lookup BD mac_by_ip4 hash table for MAC entry */
2397 ip0 = arp0->ip4_over_ethernet[1].ip4.as_u32;
2398 bd_index0 = vnet_buffer (p0)->l2.bd_index;
2399 if (PREDICT_FALSE ((bd_index0 != last_bd_index)
2400 || (last_bd_index == (u16) ~ 0)))
2402 last_bd_index = bd_index0;
2403 last_bd_config = vec_elt_at_index (l2im->bd_configs, bd_index0);
2405 macp0 = (u8 *) hash_get (last_bd_config->mac_by_ip4, ip0);
2407 if (PREDICT_FALSE (!macp0))
2408 goto next_l2_feature; /* MAC not found */
2410 /* MAC found, send ARP reply -
2411 Convert ARP request packet to ARP reply */
2412 arp0->opcode = clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply);
2413 arp0->ip4_over_ethernet[1] = arp0->ip4_over_ethernet[0];
2414 arp0->ip4_over_ethernet[0].ip4.as_u32 = ip0;
2415 clib_memcpy_fast (arp0->ip4_over_ethernet[0].ethernet, macp0, 6);
2416 clib_memcpy_fast (eth0->dst_address, eth0->src_address, 6);
2417 clib_memcpy_fast (eth0->src_address, macp0, 6);
2418 n_replies_sent += 1;
2421 /* For BVI, need to use l2-fwd node to send ARP reply as
2422 l2-output node cannot output packet to BVI properly */
2423 cfg0 = vec_elt_at_index (l2im->configs, sw_if_index0);
2424 if (PREDICT_FALSE (cfg0->bvi))
2426 vnet_buffer (p0)->l2.feature_bitmap |= L2INPUT_FEAT_FWD;
2427 vnet_buffer (p0)->sw_if_index[VLIB_RX] = 0;
2428 goto next_l2_feature;
2431 /* Send ARP/ND reply back out input interface through l2-output */
2432 vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
2433 next0 = ARP_TERM_NEXT_L2_OUTPUT;
2434 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2435 to_next, n_left_to_next, pi0,
2440 /* IP6 ND event notification or solicitation handling to generate
2441 local response instead of flooding */
2442 iph0 = (ip6_header_t *) l3h0;
2443 if (PREDICT_FALSE (ethertype0 == ETHERNET_TYPE_IP6 &&
2444 iph0->protocol == IP_PROTOCOL_ICMP6 &&
2445 !ip6_address_is_unspecified
2446 (&iph0->src_address)))
2448 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
2449 if (vnet_ip6_nd_term
2450 (vm, node, p0, eth0, iph0, sw_if_index0,
2451 vnet_buffer (p0)->l2.bd_index))
2452 goto output_response;
2457 next0 = vnet_l2_feature_next (p0, arp_term_next_node_index,
2458 L2INPUT_FEAT_ARP_TERM);
2459 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2460 to_next, n_left_to_next,
2466 if (0 == arp0->ip4_over_ethernet[0].ip4.as_u32 ||
2467 (arp0->ip4_over_ethernet[0].ip4.as_u32 ==
2468 arp0->ip4_over_ethernet[1].ip4.as_u32))
2470 error0 = ETHERNET_ARP_ERROR_gratuitous_arp;
2472 next0 = ARP_TERM_NEXT_DROP;
2473 p0->error = node->errors[error0];
2475 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2476 to_next, n_left_to_next, pi0,
2480 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2483 vlib_error_count (vm, node->node_index,
2484 ETHERNET_ARP_ERROR_replies_sent, n_replies_sent);
2485 return frame->n_vectors;
2489 VLIB_REGISTER_NODE (arp_term_l2bd_node, static) = {
2490 .function = arp_term_l2bd,
2491 .name = "arp-term-l2bd",
2492 .vector_size = sizeof (u32),
2493 .n_errors = ETHERNET_ARP_N_ERROR,
2494 .error_strings = ethernet_arp_error_strings,
2495 .n_next_nodes = ARP_TERM_N_NEXT,
2497 [ARP_TERM_NEXT_L2_OUTPUT] = "l2-output",
2498 [ARP_TERM_NEXT_DROP] = "error-drop",
2500 .format_buffer = format_ethernet_arp_header,
2501 .format_trace = format_arp_term_input_trace,
2506 arp_term_init (vlib_main_t * vm)
2508 // Initialize the feature next-node indexes
2509 feat_bitmap_init_next_nodes (vm,
2510 arp_term_l2bd_node.index,
2512 l2input_get_feat_names (),
2513 arp_term_next_node_index);
2517 VLIB_INIT_FUNCTION (arp_term_init);
2520 change_arp_mac (u32 sw_if_index, ethernet_arp_ip4_entry_t * e)
2522 if (e->sw_if_index == sw_if_index)
2524 adj_nbr_walk_nh4 (e->sw_if_index,
2525 &e->ip4_address, arp_mk_complete_walk, e);
2530 ethernet_arp_change_mac (u32 sw_if_index)
2532 ethernet_arp_main_t *am = ðernet_arp_main;
2533 ethernet_arp_ip4_entry_t *e;
2537 pool_foreach (e, am->ip4_entry_pool,
2539 change_arp_mac (sw_if_index, e);
2543 ai = adj_glean_get (FIB_PROTOCOL_IP4, sw_if_index);
2545 if (ADJ_INDEX_INVALID != ai)
2546 adj_glean_update_rewrite (ai);
2550 send_ip4_garp (vlib_main_t * vm, u32 sw_if_index)
2552 ip4_main_t *i4m = &ip4_main;
2553 ip4_address_t *ip4_addr = ip4_interface_first_address (i4m, sw_if_index, 0);
2555 send_ip4_garp_w_addr (vm, ip4_addr, sw_if_index);
2559 send_ip4_garp_w_addr (vlib_main_t * vm,
2560 const ip4_address_t * ip4_addr, u32 sw_if_index)
2562 ip4_main_t *i4m = &ip4_main;
2563 vnet_main_t *vnm = vnet_get_main ();
2564 u8 *rewrite, rewrite_len;
2565 vnet_hw_interface_t *hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
2569 clib_warning ("Sending GARP for IP4 address %U on sw_if_idex %d",
2570 format_ip4_address, ip4_addr, sw_if_index);
2572 /* Form GARP packet for output - Gratuitous ARP is an ARP request packet
2573 where the interface IP/MAC pair is used for both source and request
2574 MAC/IP pairs in the request */
2576 ethernet_arp_header_t *h = vlib_packet_template_get_packet
2577 (vm, &i4m->ip4_arp_request_packet_template, &bi);
2582 clib_memcpy_fast (h->ip4_over_ethernet[0].ethernet, hi->hw_address,
2583 sizeof (h->ip4_over_ethernet[0].ethernet));
2584 clib_memcpy_fast (h->ip4_over_ethernet[1].ethernet, hi->hw_address,
2585 sizeof (h->ip4_over_ethernet[1].ethernet));
2586 h->ip4_over_ethernet[0].ip4 = ip4_addr[0];
2587 h->ip4_over_ethernet[1].ip4 = ip4_addr[0];
2589 /* Setup MAC header with ARP Etype and broadcast DMAC */
2590 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
2592 ethernet_build_rewrite (vnm, sw_if_index, VNET_LINK_ARP,
2593 VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST);
2594 rewrite_len = vec_len (rewrite);
2595 vlib_buffer_advance (b, -rewrite_len);
2596 ethernet_header_t *e = vlib_buffer_get_current (b);
2597 clib_memcpy_fast (e->dst_address, rewrite, rewrite_len);
2600 /* Send GARP packet out the specified interface */
2601 vnet_buffer (b)->sw_if_index[VLIB_RX] =
2602 vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index;
2603 vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index);
2604 u32 *to_next = vlib_frame_vector_args (f);
2607 vlib_put_frame_to_node (vm, hi->output_node_index, f);
2612 * Remove any arp entries asociated with the specificed interface
2615 vnet_arp_delete_sw_interface (vnet_main_t * vnm, u32 sw_if_index, u32 is_add)
2617 if (!is_add && sw_if_index != ~0)
2619 ethernet_arp_main_t *am = ðernet_arp_main;
2620 ethernet_arp_ip4_entry_t *e;
2622 pool_foreach (e, am->ip4_entry_pool, ({
2623 if (e->sw_if_index != sw_if_index)
2625 vnet_arp_set_ip4_over_ethernet_rpc_args_t args = { .sw_if_index = sw_if_index,
2626 .a.ip4 = e->ip4_address };
2627 vnet_arp_unset_ip4_over_ethernet_internal (vnm, &args);
2633 VNET_SW_INTERFACE_ADD_DEL_FUNCTION (vnet_arp_delete_sw_interface);
2636 * fd.io coding-style-patch-verification: ON
2639 * eval: (c-set-style "gnu")