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;
96 uword wc_ip4_arp_publisher_node;
97 uword wc_ip4_arp_publisher_et;
98 } ethernet_arp_main_t;
100 static ethernet_arp_main_t ethernet_arp_main;
105 ethernet_arp_ip4_over_ethernet_address_t a;
109 #define ETHERNET_ARP_ARGS_REMOVE (1<<0)
110 #define ETHERNET_ARP_ARGS_FLUSH (1<<1)
111 #define ETHERNET_ARP_ARGS_POPULATE (1<<2)
112 #define ETHERNET_ARP_ARGS_WC_PUB (1<<3)
113 } vnet_arp_set_ip4_over_ethernet_rpc_args_t;
115 static const u8 vrrp_prefix[] = { 0x00, 0x00, 0x5E, 0x00, 0x01 };
117 /* Node index for send_garp_na_process */
118 u32 send_garp_na_process_node_index;
121 set_ip4_over_ethernet_rpc_callback (vnet_arp_set_ip4_over_ethernet_rpc_args_t
125 format_ethernet_arp_hardware_type (u8 * s, va_list * va)
127 ethernet_arp_hardware_type_t h = va_arg (*va, ethernet_arp_hardware_type_t);
131 #define _(n,f) case n: t = #f; break;
132 foreach_ethernet_arp_hardware_type;
136 return format (s, "unknown 0x%x", h);
139 return format (s, "%s", t);
143 format_ethernet_arp_opcode (u8 * s, va_list * va)
145 ethernet_arp_opcode_t o = va_arg (*va, ethernet_arp_opcode_t);
149 #define _(f) case ETHERNET_ARP_OPCODE_##f: t = #f; break;
150 foreach_ethernet_arp_opcode;
154 return format (s, "unknown 0x%x", o);
157 return format (s, "%s", t);
161 unformat_ethernet_arp_opcode_host_byte_order (unformat_input_t * input,
164 int *result = va_arg (*args, int *);
165 ethernet_arp_main_t *am = ðernet_arp_main;
168 /* Numeric opcode. */
169 if (unformat (input, "0x%x", &x) || unformat (input, "%d", &x))
178 if (unformat_user (input, unformat_vlib_number_by_name,
179 am->opcode_by_name, &i))
189 unformat_ethernet_arp_opcode_net_byte_order (unformat_input_t * input,
192 int *result = va_arg (*args, int *);
194 (input, unformat_ethernet_arp_opcode_host_byte_order, result))
197 *result = clib_host_to_net_u16 ((u16) * result);
202 format_ethernet_arp_header (u8 * s, va_list * va)
204 ethernet_arp_header_t *a = va_arg (*va, ethernet_arp_header_t *);
205 u32 max_header_bytes = va_arg (*va, u32);
207 u16 l2_type, l3_type;
209 if (max_header_bytes != 0 && sizeof (a[0]) > max_header_bytes)
210 return format (s, "ARP header truncated");
212 l2_type = clib_net_to_host_u16 (a->l2_type);
213 l3_type = clib_net_to_host_u16 (a->l3_type);
215 indent = format_get_indent (s);
217 s = format (s, "%U, type %U/%U, address size %d/%d",
218 format_ethernet_arp_opcode, clib_net_to_host_u16 (a->opcode),
219 format_ethernet_arp_hardware_type, l2_type,
220 format_ethernet_type, l3_type,
221 a->n_l2_address_bytes, a->n_l3_address_bytes);
223 if (l2_type == ETHERNET_ARP_HARDWARE_TYPE_ethernet
224 && l3_type == ETHERNET_TYPE_IP4)
226 s = format (s, "\n%U%U/%U -> %U/%U",
227 format_white_space, indent,
228 format_ethernet_address, a->ip4_over_ethernet[0].ethernet,
229 format_ip4_address, &a->ip4_over_ethernet[0].ip4,
230 format_ethernet_address, a->ip4_over_ethernet[1].ethernet,
231 format_ip4_address, &a->ip4_over_ethernet[1].ip4);
235 uword n2 = a->n_l2_address_bytes;
236 uword n3 = a->n_l3_address_bytes;
237 s = format (s, "\n%U%U/%U -> %U/%U",
238 format_white_space, indent,
239 format_hex_bytes, a->data + 0 * n2 + 0 * n3, n2,
240 format_hex_bytes, a->data + 1 * n2 + 0 * n3, n3,
241 format_hex_bytes, a->data + 1 * n2 + 1 * n3, n2,
242 format_hex_bytes, a->data + 2 * n2 + 1 * n3, n3);
249 format_ethernet_arp_ip4_entry (u8 * s, va_list * va)
251 vnet_main_t *vnm = va_arg (*va, vnet_main_t *);
252 ethernet_arp_ip4_entry_t *e = va_arg (*va, ethernet_arp_ip4_entry_t *);
253 vnet_sw_interface_t *si;
257 return format (s, "%=12s%=16s%=6s%=20s%=24s", "Time", "IP4",
258 "Flags", "Ethernet", "Interface");
260 si = vnet_get_sw_interface (vnm, e->sw_if_index);
262 if (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC)
263 flags = format (flags, "S");
265 if (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_DYNAMIC)
266 flags = format (flags, "D");
268 if (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_NO_FIB_ENTRY)
269 flags = format (flags, "N");
271 s = format (s, "%=12U%=16U%=6s%=20U%U",
272 format_vlib_cpu_time, vnm->vlib_main, e->cpu_time_last_updated,
273 format_ip4_address, &e->ip4_address,
274 flags ? (char *) flags : "",
275 format_ethernet_address, e->ethernet_address,
276 format_vnet_sw_interface_name, vnm, si);
285 } ethernet_arp_input_trace_t;
288 format_ethernet_arp_input_trace (u8 * s, va_list * va)
290 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
291 CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
292 ethernet_arp_input_trace_t *t = va_arg (*va, ethernet_arp_input_trace_t *);
295 format_ethernet_arp_header,
296 t->packet_data, sizeof (t->packet_data));
302 format_arp_term_input_trace (u8 * s, va_list * va)
304 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
305 CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
306 ethernet_arp_input_trace_t *t = va_arg (*va, ethernet_arp_input_trace_t *);
308 /* arp-term trace data saved is either arp or ip6/icmp6 packet:
309 - for arp, the 1st 16-bit field is hw type of value of 0x0001.
310 - for ip6, the first nibble has value of 6. */
311 s = format (s, "%U", t->packet_data[0] == 0 ?
312 format_ethernet_arp_header : format_ip6_header,
313 t->packet_data, sizeof (t->packet_data));
319 arp_nbr_probe (ip_adjacency_t * adj)
321 vnet_main_t *vnm = vnet_get_main ();
322 ip4_main_t *im = &ip4_main;
323 ip_interface_address_t *ia;
324 ethernet_arp_header_t *h;
325 vnet_hw_interface_t *hi;
326 vnet_sw_interface_t *si;
332 vm = vlib_get_main ();
334 si = vnet_get_sw_interface (vnm, adj->rewrite_header.sw_if_index);
336 if (!(si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
342 ip4_interface_address_matching_destination (im,
343 &adj->sub_type.nbr.next_hop.
353 vlib_packet_template_get_packet (vm, &im->ip4_arp_request_packet_template,
356 hi = vnet_get_sup_hw_interface (vnm, adj->rewrite_header.sw_if_index);
358 clib_memcpy (h->ip4_over_ethernet[0].ethernet,
359 hi->hw_address, sizeof (h->ip4_over_ethernet[0].ethernet));
361 h->ip4_over_ethernet[0].ip4 = src[0];
362 h->ip4_over_ethernet[1].ip4 = adj->sub_type.nbr.next_hop.ip4;
364 b = vlib_get_buffer (vm, bi);
365 vnet_buffer (b)->sw_if_index[VLIB_RX] =
366 vnet_buffer (b)->sw_if_index[VLIB_TX] = adj->rewrite_header.sw_if_index;
368 /* Add encapsulation string for software interface (e.g. ethernet header). */
369 vnet_rewrite_one_header (adj[0], h, sizeof (ethernet_header_t));
370 vlib_buffer_advance (b, -adj->rewrite_header.data_bytes);
373 vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index);
374 u32 *to_next = vlib_frame_vector_args (f);
377 vlib_put_frame_to_node (vm, hi->output_node_index, f);
382 arp_mk_complete (adj_index_t ai, ethernet_arp_ip4_entry_t * e)
384 adj_nbr_update_rewrite
385 (ai, ADJ_NBR_REWRITE_FLAG_COMPLETE,
386 ethernet_build_rewrite (vnet_get_main (),
388 adj_get_link_type (ai), e->ethernet_address));
392 arp_mk_incomplete (adj_index_t ai)
394 ip_adjacency_t *adj = adj_get (ai);
396 adj_nbr_update_rewrite
398 ADJ_NBR_REWRITE_FLAG_INCOMPLETE,
399 ethernet_build_rewrite (vnet_get_main (),
400 adj->rewrite_header.sw_if_index,
402 VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST));
405 static ethernet_arp_ip4_entry_t *
406 arp_entry_find (ethernet_arp_interface_t * eai, const ip4_address_t * addr)
408 ethernet_arp_main_t *am = ðernet_arp_main;
409 ethernet_arp_ip4_entry_t *e = NULL;
412 if (NULL != eai->arp_entries)
414 p = hash_get (eai->arp_entries, addr->as_u32);
418 e = pool_elt_at_index (am->ip4_entry_pool, p[0]);
425 arp_mk_complete_walk (adj_index_t ai, void *ctx)
427 ethernet_arp_ip4_entry_t *e = ctx;
429 arp_mk_complete (ai, e);
431 return (ADJ_WALK_RC_CONTINUE);
435 arp_mk_incomplete_walk (adj_index_t ai, void *ctx)
437 arp_mk_incomplete (ai);
439 return (ADJ_WALK_RC_CONTINUE);
443 arp_update_adjacency (vnet_main_t * vnm, u32 sw_if_index, u32 ai)
445 ethernet_arp_main_t *am = ðernet_arp_main;
446 ethernet_arp_interface_t *arp_int;
447 ethernet_arp_ip4_entry_t *e;
452 vec_validate (am->ethernet_arp_by_sw_if_index, sw_if_index);
453 arp_int = &am->ethernet_arp_by_sw_if_index[sw_if_index];
454 e = arp_entry_find (arp_int, &adj->sub_type.nbr.next_hop.ip4);
456 switch (adj->lookup_next_index)
458 case IP_LOOKUP_NEXT_ARP:
459 case IP_LOOKUP_NEXT_GLEAN:
462 adj_nbr_walk_nh4 (sw_if_index,
463 &e->ip4_address, arp_mk_complete_walk, e);
468 * no matching ARP entry.
469 * construct the rewrite required to for an ARP packet, and stick
470 * that in the adj's pipe to smoke.
472 adj_nbr_update_rewrite
474 ADJ_NBR_REWRITE_FLAG_INCOMPLETE,
475 ethernet_build_rewrite
479 VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST));
482 * since the FIB has added this adj for a route, it makes sense it
483 * may want to forward traffic sometime soon. Let's send a
484 * speculative ARP. just one. If we were to do periodically that
485 * wouldn't be bad either, but that's more code than i'm prepared to
486 * write at this time for relatively little reward.
491 case IP_LOOKUP_NEXT_MCAST:
494 * Construct a partial rewrite from the known ethernet mcast dest MAC
499 rewrite = ethernet_build_rewrite (vnm,
502 ethernet_ip4_mcast_dst_addr ());
503 offset = vec_len (rewrite) - 2;
506 * Complete the remaining fields of the adj's rewrite to direct the
507 * complete of the rewrite at switch time by copying in the IP
508 * dst address's bytes.
509 * Ofset is 2 bytes into the MAC desintation address. And we copy 23 bits
512 adj_mcast_update_rewrite (ai, rewrite, offset, 0x007fffff);
516 case IP_LOOKUP_NEXT_DROP:
517 case IP_LOOKUP_NEXT_PUNT:
518 case IP_LOOKUP_NEXT_LOCAL:
519 case IP_LOOKUP_NEXT_REWRITE:
520 case IP_LOOKUP_NEXT_MCAST_MIDCHAIN:
521 case IP_LOOKUP_NEXT_MIDCHAIN:
522 case IP_LOOKUP_NEXT_ICMP_ERROR:
523 case IP_LOOKUP_N_NEXT:
530 arp_adj_fib_add (ethernet_arp_ip4_entry_t * e, u32 fib_index)
534 .fp_proto = FIB_PROTOCOL_IP4,
535 .fp_addr.ip4 = e->ip4_address,
539 fib_table_entry_path_add (fib_index, &pfx, FIB_SOURCE_ADJ,
540 FIB_ENTRY_FLAG_ATTACHED,
541 DPO_PROTO_IP4, &pfx.fp_addr,
542 e->sw_if_index, ~0, 1, NULL,
543 FIB_ROUTE_PATH_FLAG_NONE);
544 fib_table_lock (fib_index, FIB_PROTOCOL_IP4, FIB_SOURCE_ADJ);
548 vnet_arp_set_ip4_over_ethernet_internal (vnet_main_t * vnm,
549 vnet_arp_set_ip4_over_ethernet_rpc_args_t
552 ethernet_arp_ip4_entry_t *e = 0;
553 ethernet_arp_main_t *am = ðernet_arp_main;
554 ethernet_arp_ip4_over_ethernet_address_t *a = &args->a;
555 vlib_main_t *vm = vlib_get_main ();
556 int make_new_arp_cache_entry = 1;
558 pending_resolution_t *pr, *mc;
559 ethernet_arp_interface_t *arp_int;
560 int is_static = args->is_static;
561 u32 sw_if_index = args->sw_if_index;
562 int is_no_fib_entry = args->is_no_fib_entry;
564 vec_validate (am->ethernet_arp_by_sw_if_index, sw_if_index);
566 arp_int = &am->ethernet_arp_by_sw_if_index[sw_if_index];
568 if (NULL != arp_int->arp_entries)
570 p = hash_get (arp_int->arp_entries, a->ip4.as_u32);
573 e = pool_elt_at_index (am->ip4_entry_pool, p[0]);
575 /* Refuse to over-write static arp. */
576 if (!is_static && (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC))
578 make_new_arp_cache_entry = 0;
582 if (make_new_arp_cache_entry)
584 pool_get (am->ip4_entry_pool, e);
586 if (NULL == arp_int->arp_entries)
588 arp_int->arp_entries = hash_create (0, sizeof (u32));
591 hash_set (arp_int->arp_entries, a->ip4.as_u32, e - am->ip4_entry_pool);
593 e->sw_if_index = sw_if_index;
594 e->ip4_address = a->ip4;
595 e->fib_entry_index = FIB_NODE_INDEX_INVALID;
596 clib_memcpy (e->ethernet_address,
597 a->ethernet, sizeof (e->ethernet_address));
599 if (!is_no_fib_entry)
602 ip4_fib_table_get_index_for_sw_if_index
607 e->flags |= ETHERNET_ARP_IP4_ENTRY_FLAG_NO_FIB_ENTRY;
613 * prevent a DoS attack from the data-plane that
614 * spams us with no-op updates to the MAC address
616 if (0 == memcmp (e->ethernet_address,
617 a->ethernet, sizeof (e->ethernet_address)))
620 /* Update time stamp and ethernet address. */
621 clib_memcpy (e->ethernet_address, a->ethernet,
622 sizeof (e->ethernet_address));
625 e->cpu_time_last_updated = clib_cpu_time_now ();
627 e->flags |= ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC;
629 e->flags |= ETHERNET_ARP_IP4_ENTRY_FLAG_DYNAMIC;
631 adj_nbr_walk_nh4 (sw_if_index, &e->ip4_address, arp_mk_complete_walk, e);
633 /* Customer(s) waiting for this address to be resolved? */
634 p = hash_get (am->pending_resolutions_by_address, a->ip4.as_u32);
640 while (next_index != (u32) ~ 0)
642 pr = pool_elt_at_index (am->pending_resolutions, next_index);
643 vlib_process_signal_event (vm, pr->node_index,
644 pr->type_opaque, pr->data);
645 next_index = pr->next_index;
646 pool_put (am->pending_resolutions, pr);
649 hash_unset (am->pending_resolutions_by_address, a->ip4.as_u32);
652 /* Customer(s) requesting ARP event for this address? */
653 p = hash_get (am->mac_changes_by_address, a->ip4.as_u32);
659 while (next_index != (u32) ~ 0)
661 int (*fp) (u32, u8 *, u32, u32);
663 mc = pool_elt_at_index (am->mac_changes, next_index);
664 fp = mc->data_callback;
666 /* Call the user's data callback, return 1 to suppress dup events */
668 rv = (*fp) (mc->data, a->ethernet, sw_if_index, 0);
671 * Signal the resolver process, as long as the user
672 * says they want to be notified
675 vlib_process_signal_event (vm, mc->node_index,
676 mc->type_opaque, mc->data);
677 next_index = mc->next_index;
685 vnet_register_ip4_arp_resolution_event (vnet_main_t * vnm,
688 uword type_opaque, uword data)
690 ethernet_arp_main_t *am = ðernet_arp_main;
691 ip4_address_t *address = address_arg;
693 pending_resolution_t *pr;
695 pool_get (am->pending_resolutions, pr);
698 pr->node_index = node_index;
699 pr->type_opaque = type_opaque;
701 pr->data_callback = 0;
703 p = hash_get (am->pending_resolutions_by_address, address->as_u32);
706 /* Insert new resolution at the head of the list */
707 pr->next_index = p[0];
708 hash_unset (am->pending_resolutions_by_address, address->as_u32);
711 hash_set (am->pending_resolutions_by_address, address->as_u32,
712 pr - am->pending_resolutions);
716 vnet_add_del_ip4_arp_change_event (vnet_main_t * vnm,
721 uword type_opaque, uword data, int is_add)
723 ethernet_arp_main_t *am = ðernet_arp_main;
724 ip4_address_t *address = address_arg;
726 /* Try to find an existing entry */
727 u32 *first = (u32 *) hash_get (am->mac_changes_by_address, address->as_u32);
729 pending_resolution_t *mc;
730 while (p && *p != ~0)
732 mc = pool_elt_at_index (am->mac_changes, *p);
733 if (mc->node_index == node_index && mc->type_opaque == type_opaque
739 int found = p && *p != ~0;
743 return VNET_API_ERROR_ENTRY_ALREADY_EXISTS;
745 pool_get (am->mac_changes, mc);
746 *mc = (pending_resolution_t)
748 .next_index = ~0,.node_index = node_index,.type_opaque =
749 type_opaque,.data = data,.data_callback = data_callback,.pid =
752 /* Insert new resolution at the end of the list */
753 u32 new_idx = mc - am->mac_changes;
757 hash_set (am->mac_changes_by_address, address->as_u32, new_idx);
762 return VNET_API_ERROR_NO_SUCH_ENTRY;
764 /* Clients may need to clean up pool entries, too */
765 void (*fp) (u32, u8 *) = data_callback;
767 (*fp) (mc->data, 0 /* no new mac addrs */ );
769 /* Remove the entry from the list and delete the entry */
771 pool_put (am->mac_changes, mc);
773 /* Remove from hash if we deleted the last entry */
774 if (*p == ~0 && p == first)
775 hash_unset (am->mac_changes_by_address, address->as_u32);
780 /* Either we drop the packet or we send a reply to the sender. */
784 ARP_INPUT_NEXT_REPLY_TX,
788 #define foreach_ethernet_arp_error \
789 _ (replies_sent, "ARP replies sent") \
790 _ (l2_type_not_ethernet, "L2 type not ethernet") \
791 _ (l3_type_not_ip4, "L3 type not IP4") \
792 _ (l3_src_address_not_local, "IP4 source address not local to subnet") \
793 _ (l3_dst_address_not_local, "IP4 destination address not local to subnet") \
794 _ (l3_src_address_is_local, "IP4 source address matches local interface") \
795 _ (l3_src_address_learned, "ARP request IP4 source address learned") \
796 _ (replies_received, "ARP replies received") \
797 _ (opcode_not_request, "ARP opcode not request") \
798 _ (proxy_arp_replies_sent, "Proxy ARP replies sent") \
799 _ (l2_address_mismatch, "ARP hw addr does not match L2 frame src addr") \
800 _ (gratuitous_arp, "ARP probe or announcement dropped") \
801 _ (interface_no_table, "Interface is not mapped to an IP table") \
802 _ (interface_not_ip_enabled, "Interface is not IP enabled") \
806 #define _(sym,string) ETHERNET_ARP_ERROR_##sym,
807 foreach_ethernet_arp_error
809 ETHERNET_ARP_N_ERROR,
810 } ethernet_arp_input_error_t;
814 unset_random_arp_entry (void)
816 ethernet_arp_main_t *am = ðernet_arp_main;
817 ethernet_arp_ip4_entry_t *e;
818 vnet_main_t *vnm = vnet_get_main ();
819 ethernet_arp_ip4_over_ethernet_address_t delme;
822 index = pool_next_index (am->ip4_entry_pool, am->arp_delete_rotor);
823 am->arp_delete_rotor = index;
825 /* Try again from elt 0, could happen if an intfc goes down */
828 index = pool_next_index (am->ip4_entry_pool, am->arp_delete_rotor);
829 am->arp_delete_rotor = index;
832 /* Nothing left in the pool */
836 e = pool_elt_at_index (am->ip4_entry_pool, index);
838 clib_memcpy (&delme.ethernet, e->ethernet_address, 6);
839 delme.ip4.as_u32 = e->ip4_address.as_u32;
841 vnet_arp_unset_ip4_over_ethernet (vnm, e->sw_if_index, &delme);
845 arp_unnumbered (vlib_buffer_t * p0,
846 u32 input_sw_if_index, u32 conn_sw_if_index)
848 vnet_main_t *vnm = vnet_get_main ();
849 vnet_interface_main_t *vim = &vnm->interface_main;
850 vnet_sw_interface_t *si;
852 /* verify that the input interface is unnumbered to the connected.
853 * the connected interface is the interface on which the subnet is
855 si = &vim->sw_interfaces[input_sw_if_index];
857 if (!(si->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED &&
858 (si->unnumbered_sw_if_index == conn_sw_if_index)))
860 /* the input interface is not unnumbered to the interface on which
861 * the sub-net is configured that covers the ARP request.
862 * So this is not the case for unnumbered.. */
870 arp_learn (vnet_main_t * vnm,
871 ethernet_arp_main_t * am, u32 sw_if_index, void *addr)
873 if (am->limit_arp_cache_size &&
874 pool_elts (am->ip4_entry_pool) >= am->limit_arp_cache_size)
875 unset_random_arp_entry ();
877 vnet_arp_set_ip4_over_ethernet (vnm, sw_if_index, addr, 0, 0);
878 return (ETHERNET_ARP_ERROR_l3_src_address_learned);
882 arp_input (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
884 ethernet_arp_main_t *am = ðernet_arp_main;
885 vnet_main_t *vnm = vnet_get_main ();
886 ip4_main_t *im4 = &ip4_main;
887 u32 n_left_from, next_index, *from, *to_next;
888 u32 n_replies_sent = 0, n_proxy_arp_replies_sent = 0;
890 from = vlib_frame_vector_args (frame);
891 n_left_from = frame->n_vectors;
892 next_index = node->cached_next_index;
894 if (node->flags & VLIB_NODE_FLAG_TRACE)
895 vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
897 sizeof (ethernet_arp_input_trace_t));
899 while (n_left_from > 0)
903 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
905 while (n_left_from > 0 && n_left_to_next > 0)
908 vnet_hw_interface_t *hw_if0;
909 ethernet_arp_header_t *arp0;
910 ethernet_header_t *eth_rx, *eth_tx;
911 ip4_address_t *if_addr0, proxy_src;
912 u32 pi0, error0, next0, sw_if_index0, conn_sw_if_index0, fib_index0;
913 u8 is_request0, dst_is_local0, is_unnum0, is_vrrp_reply0;
914 ethernet_proxy_arp_t *pa;
915 fib_node_index_t dst_fei, src_fei;
917 fib_entry_flag_t src_flags, dst_flags;
918 u8 *rewrite0, rewrite0_len;
928 p0 = vlib_get_buffer (vm, pi0);
929 arp0 = vlib_buffer_get_current (p0);
930 /* Fill in ethernet header. */
931 eth_rx = ethernet_buffer_get_header (p0);
933 is_request0 = arp0->opcode
934 == clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_request);
936 error0 = ETHERNET_ARP_ERROR_replies_sent;
940 clib_net_to_host_u16 (ETHERNET_ARP_HARDWARE_TYPE_ethernet) ?
941 ETHERNET_ARP_ERROR_l2_type_not_ethernet : error0);
944 clib_net_to_host_u16 (ETHERNET_TYPE_IP4) ?
945 ETHERNET_ARP_ERROR_l3_type_not_ip4 : error0);
947 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
949 /* not playing the ARP game if the interface is not IPv4 enabled */
951 (im4->ip_enabled_by_sw_if_index[sw_if_index0] == 0 ?
952 ETHERNET_ARP_ERROR_interface_not_ip_enabled : error0);
957 /* Check that IP address is local and matches incoming interface. */
958 fib_index0 = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);
959 if (~0 == fib_index0)
961 error0 = ETHERNET_ARP_ERROR_interface_no_table;
965 dst_fei = ip4_fib_table_lookup (ip4_fib_get (fib_index0),
966 &arp0->ip4_over_ethernet[1].ip4,
968 dst_flags = fib_entry_get_flags (dst_fei);
970 conn_sw_if_index0 = fib_entry_get_resolving_interface (dst_fei);
972 /* Honor unnumbered interface, if any */
973 is_unnum0 = sw_if_index0 != conn_sw_if_index0;
977 * we're looking for FIB entries that indicate the source
978 * is attached. There may be more specific non-attached
979 * routes tht match the source, but these do not influence
980 * whether we respond to an ARP request, i.e. they do not
981 * influence whether we are the correct way for the sender
982 * to reach us, they only affect how we reach the sender.
984 fib_entry_t *src_fib_entry;
985 fib_entry_src_t *src;
996 src_fei = ip4_fib_table_lookup (ip4_fib_get (fib_index0),
998 ip4_over_ethernet[0].ip4,
1000 src_fib_entry = fib_entry_get (src_fei);
1003 * It's possible that the source that provides the
1004 * flags we need, or the flags we must not have,
1005 * is not the best source, so check then all.
1008 FOR_EACH_SRC_ADDED(src_fib_entry, src, source,
1010 src_flags = fib_entry_get_flags_for_source (src_fei, source);
1012 /* Reject requests/replies with our local interface
1014 if (FIB_ENTRY_FLAG_LOCAL & src_flags)
1016 error0 = ETHERNET_ARP_ERROR_l3_src_address_is_local;
1018 * When VPP has an interface whose address is also
1019 * applied to a TAP interface on the host, then VPP's
1020 * TAP interface will be unnumbered to the 'real'
1021 * interface and do proxy ARP from the host.
1022 * The curious aspect of this setup is that ARP requests
1023 * from the host will come from the VPP's own address.
1024 * So don't drop immediately here, instead go see if this
1025 * is a proxy ARP case.
1029 /* A Source must also be local to subnet of matching
1030 * interface address. */
1031 if ((FIB_ENTRY_FLAG_ATTACHED & src_flags) ||
1032 (FIB_ENTRY_FLAG_CONNECTED & src_flags))
1039 * The packet was sent from an address that is not
1040 * connected nor attached i.e. it is not from an
1041 * address that is covered by a link's sub-net,
1042 * nor is it a already learned host resp.
1048 * shorter mask lookup for the next iteration.
1050 fib_entry_get_prefix (src_fei, &pfx);
1051 mask = pfx.fp_len - 1;
1054 * continue until we hit the default route or we find
1055 * the attached we are looking for. The most likely
1056 * outcome is we find the attached with the first source
1057 * on the first lookup.
1061 !fib_entry_is_sourced (src_fei, FIB_SOURCE_DEFAULT_ROUTE));
1066 * the matching route is a not attached, i.e. it was
1067 * added as a result of routing, rather than interface/ARP
1068 * configuration. If the matching route is not a host route
1071 error0 = ETHERNET_ARP_ERROR_l3_src_address_not_local;
1076 if (!(FIB_ENTRY_FLAG_CONNECTED & dst_flags))
1078 error0 = ETHERNET_ARP_ERROR_l3_dst_address_not_local;
1082 if (sw_if_index0 != fib_entry_get_resolving_interface (src_fei))
1085 * The interface the ARP was received on is not the interface
1086 * on which the covering prefix is configured. Maybe this is a
1087 * case for unnumbered.
1092 dst_is_local0 = (FIB_ENTRY_FLAG_LOCAL & dst_flags);
1093 fib_entry_get_prefix (dst_fei, &pfx0);
1094 if_addr0 = &pfx0.fp_addr.ip4;
1098 clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply))
1101 (arp0->ip4_over_ethernet[0].ethernet, vrrp_prefix,
1102 sizeof (vrrp_prefix))));
1104 /* Trash ARP packets whose ARP-level source addresses do not
1105 match their L2-frame-level source addresses, unless it's
1106 a reply from a VRRP virtual router */
1108 (eth_rx->src_address, arp0->ip4_over_ethernet[0].ethernet,
1109 sizeof (eth_rx->src_address)) && !is_vrrp_reply0)
1111 error0 = ETHERNET_ARP_ERROR_l2_address_mismatch;
1115 /* Learn or update sender's mapping only for replies to addresses
1116 * that are local to the subnet */
1118 clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply) &&
1121 error0 = arp_learn (vnm, am, sw_if_index0,
1122 &arp0->ip4_over_ethernet[0]);
1128 An adjacency to the sender is not always present,
1129 so we use the interface to build us a rewrite string
1130 which will contain all the necessary tags. */
1131 rewrite0 = ethernet_build_rewrite (vnm, sw_if_index0,
1133 eth_rx->src_address);
1134 rewrite0_len = vec_len (rewrite0);
1136 /* Figure out how much to rewind current data from adjacency. */
1137 vlib_buffer_advance (p0, -rewrite0_len);
1138 eth_tx = vlib_buffer_get_current (p0);
1140 vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
1141 hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
1143 /* Send reply back through input interface */
1144 vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
1145 next0 = ARP_INPUT_NEXT_REPLY_TX;
1147 arp0->opcode = clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply);
1149 arp0->ip4_over_ethernet[1] = arp0->ip4_over_ethernet[0];
1151 clib_memcpy (arp0->ip4_over_ethernet[0].ethernet,
1152 hw_if0->hw_address, 6);
1153 clib_mem_unaligned (&arp0->ip4_over_ethernet[0].ip4.data_u32, u32) =
1156 /* Hardware must be ethernet-like. */
1157 ASSERT (vec_len (hw_if0->hw_address) == 6);
1159 /* the rx nd tx ethernet headers wil overlap in the case
1160 * when we received a tagged VLAN=0 packet, but we are sending
1162 clib_memcpy (eth_tx, rewrite0, vec_len (rewrite0));
1163 vec_free (rewrite0);
1169 if (!arp_unnumbered (p0, sw_if_index0, conn_sw_if_index0))
1174 /* We are going to reply to this request, so, in the absence of
1175 errors, learn the sender */
1177 error0 = arp_learn (vnm, am, sw_if_index0,
1178 &arp0->ip4_over_ethernet[1]);
1180 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1181 n_left_to_next, pi0, next0);
1183 n_replies_sent += 1;
1187 if (0 == arp0->ip4_over_ethernet[0].ip4.as_u32 ||
1188 (arp0->ip4_over_ethernet[0].ip4.as_u32 ==
1189 arp0->ip4_over_ethernet[1].ip4.as_u32))
1191 error0 = ETHERNET_ARP_ERROR_gratuitous_arp;
1194 /* See if proxy arp is configured for the address */
1197 vnet_sw_interface_t *si;
1198 u32 this_addr = clib_net_to_host_u32
1199 (arp0->ip4_over_ethernet[1].ip4.as_u32);
1202 si = vnet_get_sw_interface (vnm, sw_if_index0);
1204 if (!(si->flags & VNET_SW_INTERFACE_FLAG_PROXY_ARP))
1207 fib_index0 = vec_elt (im4->fib_index_by_sw_if_index,
1210 vec_foreach (pa, am->proxy_arps)
1212 u32 lo_addr = clib_net_to_host_u32 (pa->lo_addr);
1213 u32 hi_addr = clib_net_to_host_u32 (pa->hi_addr);
1215 /* an ARP request hit in the proxy-arp table? */
1216 if ((this_addr >= lo_addr && this_addr <= hi_addr) &&
1217 (fib_index0 == pa->fib_index))
1220 arp0->ip4_over_ethernet[1].ip4.data_u32;
1223 * change the interface address to the proxied
1225 if_addr0 = &proxy_src;
1227 n_proxy_arp_replies_sent++;
1235 next0 = ARP_INPUT_NEXT_DROP;
1236 p0->error = node->errors[error0];
1238 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1239 n_left_to_next, pi0, next0);
1242 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1245 vlib_error_count (vm, node->node_index,
1246 ETHERNET_ARP_ERROR_replies_sent,
1247 n_replies_sent - n_proxy_arp_replies_sent);
1249 vlib_error_count (vm, node->node_index,
1250 ETHERNET_ARP_ERROR_proxy_arp_replies_sent,
1251 n_proxy_arp_replies_sent);
1252 return frame->n_vectors;
1255 static char *ethernet_arp_error_strings[] = {
1256 #define _(sym,string) string,
1257 foreach_ethernet_arp_error
1262 VLIB_REGISTER_NODE (arp_input_node, static) =
1264 .function = arp_input,
1265 .name = "arp-input",
1266 .vector_size = sizeof (u32),
1267 .n_errors = ETHERNET_ARP_N_ERROR,
1268 .error_strings = ethernet_arp_error_strings,
1269 .n_next_nodes = ARP_INPUT_N_NEXT,
1271 [ARP_INPUT_NEXT_DROP] = "error-drop",
1272 [ARP_INPUT_NEXT_REPLY_TX] = "interface-output",
1274 .format_buffer = format_ethernet_arp_header,
1275 .format_trace = format_ethernet_arp_input_trace,
1280 ip4_arp_entry_sort (void *a1, void *a2)
1282 ethernet_arp_ip4_entry_t *e1 = a1;
1283 ethernet_arp_ip4_entry_t *e2 = a2;
1286 vnet_main_t *vnm = vnet_get_main ();
1288 cmp = vnet_sw_interface_compare (vnm, e1->sw_if_index, e2->sw_if_index);
1290 cmp = ip4_address_compare (&e1->ip4_address, &e2->ip4_address);
1294 ethernet_arp_ip4_entry_t *
1295 ip4_neighbor_entries (u32 sw_if_index)
1297 ethernet_arp_main_t *am = ðernet_arp_main;
1298 ethernet_arp_ip4_entry_t *n, *ns = 0;
1301 pool_foreach (n, am->ip4_entry_pool, ({
1302 if (sw_if_index != ~0 && n->sw_if_index != sw_if_index)
1304 vec_add1 (ns, n[0]);
1309 vec_sort_with_function (ns, ip4_arp_entry_sort);
1313 static clib_error_t *
1314 show_ip4_arp (vlib_main_t * vm,
1315 unformat_input_t * input, vlib_cli_command_t * cmd)
1317 vnet_main_t *vnm = vnet_get_main ();
1318 ethernet_arp_main_t *am = ðernet_arp_main;
1319 ethernet_arp_ip4_entry_t *e, *es;
1320 ethernet_proxy_arp_t *pa;
1321 clib_error_t *error = 0;
1324 /* Filter entries by interface if given. */
1326 (void) unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index);
1328 es = ip4_neighbor_entries (sw_if_index);
1331 vlib_cli_output (vm, "%U", format_ethernet_arp_ip4_entry, vnm, 0);
1334 vlib_cli_output (vm, "%U", format_ethernet_arp_ip4_entry, vnm, e);
1339 if (vec_len (am->proxy_arps))
1341 vlib_cli_output (vm, "Proxy arps enabled for:");
1342 vec_foreach (pa, am->proxy_arps)
1344 vlib_cli_output (vm, "Fib_index %d %U - %U ",
1346 format_ip4_address, &pa->lo_addr,
1347 format_ip4_address, &pa->hi_addr);
1355 * Display all the IPv4 ARP entries.
1358 * Example of how to display the IPv4 ARP table:
1359 * @cliexstart{show ip arp}
1360 * Time FIB IP4 Flags Ethernet Interface
1361 * 346.3028 0 6.1.1.3 de:ad:be:ef:ba:be GigabitEthernet2/0/0
1362 * 3077.4271 0 6.1.1.4 S de:ad:be:ef:ff:ff GigabitEthernet2/0/0
1363 * 2998.6409 1 6.2.2.3 de:ad:be:ef:00:01 GigabitEthernet2/0/0
1364 * Proxy arps enabled for:
1365 * Fib_index 0 6.0.0.1 - 6.0.0.11
1369 VLIB_CLI_COMMAND (show_ip4_arp_command, static) = {
1370 .path = "show ip arp",
1371 .function = show_ip4_arp,
1372 .short_help = "show ip arp",
1378 pg_edit_t l2_type, l3_type;
1379 pg_edit_t n_l2_address_bytes, n_l3_address_bytes;
1385 } ip4_over_ethernet[2];
1386 } pg_ethernet_arp_header_t;
1389 pg_ethernet_arp_header_init (pg_ethernet_arp_header_t * p)
1391 /* Initialize fields that are not bit fields in the IP header. */
1392 #define _(f) pg_edit_init (&p->f, ethernet_arp_header_t, f);
1395 _(n_l2_address_bytes);
1396 _(n_l3_address_bytes);
1398 _(ip4_over_ethernet[0].ethernet);
1399 _(ip4_over_ethernet[0].ip4);
1400 _(ip4_over_ethernet[1].ethernet);
1401 _(ip4_over_ethernet[1].ip4);
1406 unformat_pg_arp_header (unformat_input_t * input, va_list * args)
1408 pg_stream_t *s = va_arg (*args, pg_stream_t *);
1409 pg_ethernet_arp_header_t *p;
1412 p = pg_create_edit_group (s, sizeof (p[0]), sizeof (ethernet_arp_header_t),
1414 pg_ethernet_arp_header_init (p);
1417 pg_edit_set_fixed (&p->l2_type, ETHERNET_ARP_HARDWARE_TYPE_ethernet);
1418 pg_edit_set_fixed (&p->l3_type, ETHERNET_TYPE_IP4);
1419 pg_edit_set_fixed (&p->n_l2_address_bytes, 6);
1420 pg_edit_set_fixed (&p->n_l3_address_bytes, 4);
1422 if (!unformat (input, "%U: %U/%U -> %U/%U",
1424 unformat_ethernet_arp_opcode_net_byte_order, &p->opcode,
1426 unformat_ethernet_address, &p->ip4_over_ethernet[0].ethernet,
1428 unformat_ip4_address, &p->ip4_over_ethernet[0].ip4,
1430 unformat_ethernet_address, &p->ip4_over_ethernet[1].ethernet,
1432 unformat_ip4_address, &p->ip4_over_ethernet[1].ip4))
1434 /* Free up any edits we may have added. */
1435 pg_free_edit_group (s);
1442 ip4_set_arp_limit (u32 arp_limit)
1444 ethernet_arp_main_t *am = ðernet_arp_main;
1446 am->limit_arp_cache_size = arp_limit;
1451 * @brief Control Plane hook to remove an ARP entry
1454 vnet_arp_unset_ip4_over_ethernet (vnet_main_t * vnm,
1455 u32 sw_if_index, void *a_arg)
1457 ethernet_arp_ip4_over_ethernet_address_t *a = a_arg;
1458 vnet_arp_set_ip4_over_ethernet_rpc_args_t args;
1460 args.sw_if_index = sw_if_index;
1461 args.flags = ETHERNET_ARP_ARGS_REMOVE;
1462 clib_memcpy (&args.a, a, sizeof (*a));
1464 vl_api_rpc_call_main_thread (set_ip4_over_ethernet_rpc_callback,
1465 (u8 *) & args, sizeof (args));
1470 * @brief Internally generated event to flush the ARP cache on an
1471 * interface state change event.
1472 * A flush will remove dynamic ARP entries, and for statics remove the MAC
1473 * address from the corresponding adjacencies.
1476 vnet_arp_flush_ip4_over_ethernet (vnet_main_t * vnm,
1477 u32 sw_if_index, void *a_arg)
1479 ethernet_arp_ip4_over_ethernet_address_t *a = a_arg;
1480 vnet_arp_set_ip4_over_ethernet_rpc_args_t args;
1482 args.sw_if_index = sw_if_index;
1483 args.flags = ETHERNET_ARP_ARGS_FLUSH;
1484 clib_memcpy (&args.a, a, sizeof (*a));
1486 vl_api_rpc_call_main_thread (set_ip4_over_ethernet_rpc_callback,
1487 (u8 *) & args, sizeof (args));
1492 * @brief Internally generated event to populate the ARP cache on an
1493 * interface state change event.
1494 * For static entries this will re-source the adjacencies.
1496 * @param sw_if_index The interface on which the ARP entires are acted
1499 vnet_arp_populate_ip4_over_ethernet (vnet_main_t * vnm,
1500 u32 sw_if_index, void *a_arg)
1502 ethernet_arp_ip4_over_ethernet_address_t *a = a_arg;
1503 vnet_arp_set_ip4_over_ethernet_rpc_args_t args;
1505 args.sw_if_index = sw_if_index;
1506 args.flags = ETHERNET_ARP_ARGS_POPULATE;
1507 clib_memcpy (&args.a, a, sizeof (*a));
1509 vl_api_rpc_call_main_thread (set_ip4_over_ethernet_rpc_callback,
1510 (u8 *) & args, sizeof (args));
1515 * @brief publish wildcard arp event
1516 * @param sw_if_index The interface on which the ARP entires are acted
1519 vnet_arp_wc_publish (u32 sw_if_index, void *a_arg)
1521 ethernet_arp_ip4_over_ethernet_address_t *a = a_arg;
1522 vnet_arp_set_ip4_over_ethernet_rpc_args_t args = {
1523 .flags = ETHERNET_ARP_ARGS_WC_PUB,
1524 .sw_if_index = sw_if_index,
1528 vl_api_rpc_call_main_thread (set_ip4_over_ethernet_rpc_callback,
1529 (u8 *) & args, sizeof (args));
1534 vnet_arp_wc_publish_internal (vnet_main_t * vnm,
1535 vnet_arp_set_ip4_over_ethernet_rpc_args_t *
1538 vlib_main_t *vm = vlib_get_main ();
1539 ethernet_arp_main_t *am = ðernet_arp_main;
1540 uword ni = am->wc_ip4_arp_publisher_node;
1541 uword et = am->wc_ip4_arp_publisher_et;
1543 if (ni == (uword) ~ 0)
1545 wc_arp_report_t *r =
1546 vlib_process_signal_event_data (vm, ni, et, 1, sizeof *r);
1547 r->ip4 = args->a.ip4.as_u32;
1548 r->sw_if_index = args->sw_if_index;
1549 memcpy (r->mac, args->a.ethernet, sizeof r->mac);
1553 wc_arp_set_publisher_node (uword node_index, uword event_type)
1555 ethernet_arp_main_t *am = ðernet_arp_main;
1556 am->wc_ip4_arp_publisher_node = node_index;
1557 am->wc_ip4_arp_publisher_et = event_type;
1561 * arp_add_del_interface_address
1563 * callback when an interface address is added or deleted
1566 arp_add_del_interface_address (ip4_main_t * im,
1569 ip4_address_t * address,
1571 u32 if_address_index, u32 is_del)
1574 * Flush the ARP cache of all entries covered by the address
1575 * that is being removed.
1577 ethernet_arp_main_t *am = ðernet_arp_main;
1578 ethernet_arp_ip4_entry_t *e;
1580 if (vec_len (am->ethernet_arp_by_sw_if_index) <= sw_if_index)
1585 ethernet_arp_interface_t *eai;
1586 u32 i, *to_delete = 0;
1589 eai = &am->ethernet_arp_by_sw_if_index[sw_if_index];
1592 hash_foreach_pair (pair, eai->arp_entries,
1594 e = pool_elt_at_index(am->ip4_entry_pool,
1596 if (ip4_destination_matches_route (im, &e->ip4_address,
1597 address, address_length))
1599 vec_add1 (to_delete, e - am->ip4_entry_pool);
1604 for (i = 0; i < vec_len (to_delete); i++)
1606 ethernet_arp_ip4_over_ethernet_address_t delme;
1607 e = pool_elt_at_index (am->ip4_entry_pool, to_delete[i]);
1609 clib_memcpy (&delme.ethernet, e->ethernet_address, 6);
1610 delme.ip4.as_u32 = e->ip4_address.as_u32;
1612 vnet_arp_flush_ip4_over_ethernet (vnet_get_main (),
1613 e->sw_if_index, &delme);
1616 vec_free (to_delete);
1621 arp_adj_fib_remove (ethernet_arp_ip4_entry_t * e, u32 fib_index)
1623 if (FIB_NODE_INDEX_INVALID != e->fib_entry_index)
1625 fib_prefix_t pfx = {
1627 .fp_proto = FIB_PROTOCOL_IP4,
1628 .fp_addr.ip4 = e->ip4_address,
1632 fib_index = ip4_fib_table_get_index_for_sw_if_index (e->sw_if_index);
1634 fib_table_entry_path_remove (fib_index, &pfx,
1638 e->sw_if_index, ~0, 1,
1639 FIB_ROUTE_PATH_FLAG_NONE);
1640 fib_table_unlock (fib_index, FIB_PROTOCOL_IP4, FIB_SOURCE_ADJ);
1645 arp_table_bind (ip4_main_t * im,
1647 u32 sw_if_index, u32 new_fib_index, u32 old_fib_index)
1649 ethernet_arp_main_t *am = ðernet_arp_main;
1650 ethernet_arp_interface_t *eai;
1651 ethernet_arp_ip4_entry_t *e;
1655 * the IP table that the interface is bound to has changed.
1656 * reinstall all the adj fibs.
1659 if (vec_len (am->ethernet_arp_by_sw_if_index) <= sw_if_index)
1662 eai = &am->ethernet_arp_by_sw_if_index[sw_if_index];
1665 hash_foreach_pair (pair, eai->arp_entries,
1667 e = pool_elt_at_index(am->ip4_entry_pool,
1670 * remove the adj-fib from the old table and add to the new
1672 arp_adj_fib_remove(e, old_fib_index);
1673 arp_adj_fib_add(e, new_fib_index);
1679 static clib_error_t *
1680 ethernet_arp_init (vlib_main_t * vm)
1682 ethernet_arp_main_t *am = ðernet_arp_main;
1683 ip4_main_t *im = &ip4_main;
1684 clib_error_t *error;
1687 if ((error = vlib_call_init_function (vm, ethernet_init)))
1690 ethernet_register_input_type (vm, ETHERNET_TYPE_ARP, arp_input_node.index);
1692 pn = pg_get_node (arp_input_node.index);
1693 pn->unformat_edit = unformat_pg_arp_header;
1695 am->opcode_by_name = hash_create_string (0, sizeof (uword));
1696 #define _(o) hash_set_mem (am->opcode_by_name, #o, ETHERNET_ARP_OPCODE_##o);
1697 foreach_ethernet_arp_opcode;
1700 /* $$$ configurable */
1701 am->limit_arp_cache_size = 50000;
1703 am->pending_resolutions_by_address = hash_create (0, sizeof (uword));
1704 am->mac_changes_by_address = hash_create (0, sizeof (uword));
1705 am->wc_ip4_arp_publisher_node = (uword) ~ 0;
1707 /* don't trace ARP error packets */
1709 vlib_node_runtime_t *rt =
1710 vlib_node_get_runtime (vm, arp_input_node.index);
1713 vnet_pcap_drop_trace_filter_add_del \
1714 (rt->errors[ETHERNET_ARP_ERROR_##a], \
1716 foreach_ethernet_arp_error
1720 ip4_add_del_interface_address_callback_t cb;
1721 cb.function = arp_add_del_interface_address;
1722 cb.function_opaque = 0;
1723 vec_add1 (im->add_del_interface_address_callbacks, cb);
1725 ip4_table_bind_callback_t cbt;
1726 cbt.function = arp_table_bind;
1727 cbt.function_opaque = 0;
1728 vec_add1 (im->table_bind_callbacks, cbt);
1733 VLIB_INIT_FUNCTION (ethernet_arp_init);
1736 arp_entry_free (ethernet_arp_interface_t * eai, ethernet_arp_ip4_entry_t * e)
1738 ethernet_arp_main_t *am = ðernet_arp_main;
1740 arp_adj_fib_remove (e,
1741 ip4_fib_table_get_index_for_sw_if_index
1743 hash_unset (eai->arp_entries, e->ip4_address.as_u32);
1744 pool_put (am->ip4_entry_pool, e);
1748 vnet_arp_unset_ip4_over_ethernet_internal (vnet_main_t * vnm,
1749 vnet_arp_set_ip4_over_ethernet_rpc_args_t
1752 ethernet_arp_main_t *am = ðernet_arp_main;
1753 ethernet_arp_ip4_entry_t *e;
1754 ethernet_arp_interface_t *eai;
1756 if (vec_len (am->ethernet_arp_by_sw_if_index) <= args->sw_if_index)
1759 eai = &am->ethernet_arp_by_sw_if_index[args->sw_if_index];
1761 e = arp_entry_find (eai, &args->a.ip4);
1765 arp_entry_free (eai, e);
1767 adj_nbr_walk_nh4 (e->sw_if_index,
1768 &e->ip4_address, arp_mk_incomplete_walk, NULL);
1775 vnet_arp_flush_ip4_over_ethernet_internal (vnet_main_t * vnm,
1776 vnet_arp_set_ip4_over_ethernet_rpc_args_t
1779 ethernet_arp_main_t *am = ðernet_arp_main;
1780 ethernet_arp_ip4_entry_t *e;
1781 ethernet_arp_interface_t *eai;
1783 if (vec_len (am->ethernet_arp_by_sw_if_index) <= args->sw_if_index)
1786 eai = &am->ethernet_arp_by_sw_if_index[args->sw_if_index];
1788 e = arp_entry_find (eai, &args->a.ip4);
1792 adj_nbr_walk_nh4 (e->sw_if_index,
1793 &e->ip4_address, arp_mk_incomplete_walk, e);
1796 * The difference between flush and unset, is that an unset
1797 * means delete for static and dynamic entries. A flush
1798 * means delete only for dynamic. Flushing is what the DP
1799 * does in response to interface events. unset is only done
1800 * by the control plane.
1802 if (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC)
1804 e->flags &= ETHERNET_ARP_IP4_ENTRY_FLAG_DYNAMIC;
1806 else if (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_DYNAMIC)
1808 arp_entry_free (eai, e);
1815 vnet_arp_populate_ip4_over_ethernet_internal (vnet_main_t * vnm,
1816 vnet_arp_set_ip4_over_ethernet_rpc_args_t
1819 ethernet_arp_main_t *am = ðernet_arp_main;
1820 ethernet_arp_ip4_entry_t *e;
1821 ethernet_arp_interface_t *eai;
1823 vec_validate (am->ethernet_arp_by_sw_if_index, args->sw_if_index);
1824 eai = &am->ethernet_arp_by_sw_if_index[args->sw_if_index];
1826 e = arp_entry_find (eai, &args->a.ip4);
1830 adj_nbr_walk_nh4 (e->sw_if_index,
1831 &e->ip4_address, arp_mk_complete_walk, e);
1837 set_ip4_over_ethernet_rpc_callback (vnet_arp_set_ip4_over_ethernet_rpc_args_t
1840 vnet_main_t *vm = vnet_get_main ();
1841 ASSERT (vlib_get_thread_index () == 0);
1843 if (a->flags & ETHERNET_ARP_ARGS_REMOVE)
1844 vnet_arp_unset_ip4_over_ethernet_internal (vm, a);
1845 else if (a->flags & ETHERNET_ARP_ARGS_FLUSH)
1846 vnet_arp_flush_ip4_over_ethernet_internal (vm, a);
1847 else if (a->flags & ETHERNET_ARP_ARGS_POPULATE)
1848 vnet_arp_populate_ip4_over_ethernet_internal (vm, a);
1849 else if (a->flags & ETHERNET_ARP_ARGS_WC_PUB)
1850 vnet_arp_wc_publish_internal (vm, a);
1852 vnet_arp_set_ip4_over_ethernet_internal (vm, a);
1856 * @brief Invoked when the interface's admin state changes
1858 static clib_error_t *
1859 ethernet_arp_sw_interface_up_down (vnet_main_t * vnm,
1860 u32 sw_if_index, u32 flags)
1862 ethernet_arp_main_t *am = ðernet_arp_main;
1863 ethernet_arp_ip4_entry_t *e;
1864 u32 i, *to_delete = 0;
1867 pool_foreach (e, am->ip4_entry_pool,
1869 if (e->sw_if_index == sw_if_index)
1870 vec_add1 (to_delete,
1871 e - am->ip4_entry_pool);
1875 for (i = 0; i < vec_len (to_delete); i++)
1877 ethernet_arp_ip4_over_ethernet_address_t delme;
1878 e = pool_elt_at_index (am->ip4_entry_pool, to_delete[i]);
1880 clib_memcpy (&delme.ethernet, e->ethernet_address, 6);
1881 delme.ip4.as_u32 = e->ip4_address.as_u32;
1883 if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
1885 vnet_arp_populate_ip4_over_ethernet (vnm, e->sw_if_index, &delme);
1889 vnet_arp_flush_ip4_over_ethernet (vnm, e->sw_if_index, &delme);
1893 vec_free (to_delete);
1898 VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (ethernet_arp_sw_interface_up_down);
1901 increment_ip4_and_mac_address (ethernet_arp_ip4_over_ethernet_address_t * a)
1906 for (i = 3; i >= 0; i--)
1908 old = a->ip4.as_u8[i];
1909 a->ip4.as_u8[i] += 1;
1910 if (old < a->ip4.as_u8[i])
1914 for (i = 5; i >= 0; i--)
1916 old = a->ethernet[i];
1917 a->ethernet[i] += 1;
1918 if (old < a->ethernet[i])
1924 vnet_arp_set_ip4_over_ethernet (vnet_main_t * vnm,
1925 u32 sw_if_index, void *a_arg,
1926 int is_static, int is_no_fib_entry)
1928 ethernet_arp_ip4_over_ethernet_address_t *a = a_arg;
1929 vnet_arp_set_ip4_over_ethernet_rpc_args_t args;
1931 args.sw_if_index = sw_if_index;
1932 args.is_static = is_static;
1933 args.is_no_fib_entry = is_no_fib_entry;
1935 clib_memcpy (&args.a, a, sizeof (*a));
1937 vl_api_rpc_call_main_thread (set_ip4_over_ethernet_rpc_callback,
1938 (u8 *) & args, sizeof (args));
1943 vnet_proxy_arp_add_del (ip4_address_t * lo_addr,
1944 ip4_address_t * hi_addr, u32 fib_index, int is_del)
1946 ethernet_arp_main_t *am = ðernet_arp_main;
1947 ethernet_proxy_arp_t *pa;
1948 u32 found_at_index = ~0;
1950 vec_foreach (pa, am->proxy_arps)
1952 if (pa->lo_addr == lo_addr->as_u32
1953 && pa->hi_addr == hi_addr->as_u32 && pa->fib_index == fib_index)
1955 found_at_index = pa - am->proxy_arps;
1960 if (found_at_index != ~0)
1962 /* Delete, otherwise it's already in the table */
1964 vec_delete (am->proxy_arps, 1, found_at_index);
1967 /* delete, no such entry */
1969 return VNET_API_ERROR_NO_SUCH_ENTRY;
1971 /* add, not in table */
1972 vec_add2 (am->proxy_arps, pa, 1);
1973 pa->lo_addr = lo_addr->as_u32;
1974 pa->hi_addr = hi_addr->as_u32;
1975 pa->fib_index = fib_index;
1980 * Remove any proxy arp entries asdociated with the
1984 vnet_proxy_arp_fib_reset (u32 fib_id)
1986 ethernet_arp_main_t *am = ðernet_arp_main;
1987 ethernet_proxy_arp_t *pa;
1988 u32 *entries_to_delete = 0;
1992 fib_index = fib_table_find (FIB_PROTOCOL_IP4, fib_id);
1993 if (~0 == fib_index)
1994 return VNET_API_ERROR_NO_SUCH_ENTRY;
1996 vec_foreach (pa, am->proxy_arps)
1998 if (pa->fib_index == fib_index)
2000 vec_add1 (entries_to_delete, pa - am->proxy_arps);
2004 for (i = 0; i < vec_len (entries_to_delete); i++)
2006 vec_delete (am->proxy_arps, 1, entries_to_delete[i]);
2009 vec_free (entries_to_delete);
2014 static clib_error_t *
2015 ip_arp_add_del_command_fn (vlib_main_t * vm,
2016 unformat_input_t * input, vlib_cli_command_t * cmd)
2018 vnet_main_t *vnm = vnet_get_main ();
2020 ethernet_arp_ip4_over_ethernet_address_t lo_addr, hi_addr, addr;
2027 int is_no_fib_entry = 0;
2030 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2032 /* set ip arp TenGigE1/1/0/1 1.2.3.4 aa:bb:... or aabb.ccdd... */
2033 if (unformat (input, "%U %U %U",
2034 unformat_vnet_sw_interface, vnm, &sw_if_index,
2035 unformat_ip4_address, &addr.ip4,
2036 unformat_ethernet_address, &addr.ethernet))
2039 else if (unformat (input, "delete") || unformat (input, "del"))
2042 else if (unformat (input, "static"))
2045 else if (unformat (input, "no-fib-entry"))
2046 is_no_fib_entry = 1;
2048 else if (unformat (input, "count %d", &count))
2051 else if (unformat (input, "fib-id %d", &fib_id))
2053 fib_index = fib_table_find (FIB_PROTOCOL_IP4, fib_id);
2055 if (~0 == fib_index)
2056 return clib_error_return (0, "fib ID %d doesn't exist\n", fib_id);
2059 else if (unformat (input, "proxy %U - %U",
2060 unformat_ip4_address, &lo_addr.ip4,
2061 unformat_ip4_address, &hi_addr.ip4))
2069 (void) vnet_proxy_arp_add_del (&lo_addr.ip4, &hi_addr.ip4,
2078 for (i = 0; i < count; i++)
2082 uword event_type, *event_data = 0;
2084 /* Park the debug CLI until the arp entry is installed */
2085 vnet_register_ip4_arp_resolution_event
2086 (vnm, &addr.ip4, vlib_current_process (vm),
2087 1 /* type */ , 0 /* data */ );
2089 vnet_arp_set_ip4_over_ethernet
2090 (vnm, sw_if_index, &addr, is_static, is_no_fib_entry);
2092 vlib_process_wait_for_event (vm);
2093 event_type = vlib_process_get_events (vm, &event_data);
2094 vec_reset_length (event_data);
2095 if (event_type != 1)
2096 clib_warning ("event type %d unexpected", event_type);
2099 vnet_arp_unset_ip4_over_ethernet (vnm, sw_if_index, &addr);
2101 increment_ip4_and_mac_address (&addr);
2106 return clib_error_return (0, "unknown input `%U'",
2107 format_unformat_error, input);
2115 * Add or delete IPv4 ARP cache entries.
2117 * @note 'set ip arp' options (e.g. delete, static, 'fib-id <id>',
2118 * 'count <number>', 'interface ip4_addr mac_addr') can be added in
2119 * any order and combination.
2123 * Add or delete IPv4 ARP cache entries as follows. MAC Address can be in
2124 * either aa:bb:cc:dd:ee:ff format or aabb.ccdd.eeff format.
2125 * @cliexcmd{set ip arp GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2126 * @cliexcmd{set ip arp delete GigabitEthernet2/0/0 6.0.0.3 de:ad:be:ef:ba:be}
2128 * To add or delete an IPv4 ARP cache entry to or from a specific fib
2130 * @cliexcmd{set ip arp fib-id 1 GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2131 * @cliexcmd{set ip arp fib-id 1 delete GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2133 * Add or delete IPv4 static ARP cache entries as follows:
2134 * @cliexcmd{set ip arp static GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2135 * @cliexcmd{set ip arp static delete GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2137 * For testing / debugging purposes, the 'set ip arp' command can add or
2138 * delete multiple entries. Supply the 'count N' parameter:
2139 * @cliexcmd{set ip arp count 10 GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2142 VLIB_CLI_COMMAND (ip_arp_add_del_command, static) = {
2143 .path = "set ip arp",
2145 "set ip arp [del] <intfc> <ip-address> <mac-address> [static] [no-fib-entry] [count <count>] [fib-id <fib-id>] [proxy <lo-addr> - <hi-addr>]",
2146 .function = ip_arp_add_del_command_fn,
2150 static clib_error_t *
2151 set_int_proxy_arp_command_fn (vlib_main_t * vm,
2153 input, vlib_cli_command_t * cmd)
2155 vnet_main_t *vnm = vnet_get_main ();
2157 vnet_sw_interface_t *si;
2161 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2163 if (unformat (input, "%U", unformat_vnet_sw_interface,
2166 else if (unformat (input, "enable") || unformat (input, "on"))
2168 else if (unformat (input, "disable") || unformat (input, "off"))
2175 return clib_error_return (0, "unknown input '%U'",
2176 format_unformat_error, input);
2178 si = vnet_get_sw_interface (vnm, sw_if_index);
2181 si->flags |= VNET_SW_INTERFACE_FLAG_PROXY_ARP;
2183 si->flags &= ~VNET_SW_INTERFACE_FLAG_PROXY_ARP;
2190 * Enable proxy-arp on an interface. The vpp stack will answer ARP
2191 * requests for the indicated address range. Multiple proxy-arp
2192 * ranges may be provisioned.
2194 * @note Proxy ARP as a technology is infamous for blackholing traffic.
2195 * Also, the underlying implementation has not been performance-tuned.
2196 * Avoid creating an unnecessarily large set of ranges.
2199 * To enable proxy arp on a range of addresses, use:
2200 * @cliexcmd{set ip arp proxy 6.0.0.1 - 6.0.0.11}
2201 * Append 'del' to delete a range of proxy ARP addresses:
2202 * @cliexcmd{set ip arp proxy 6.0.0.1 - 6.0.0.11 del}
2203 * You must then specifically enable proxy arp on individual interfaces:
2204 * @cliexcmd{set interface proxy-arp GigabitEthernet0/8/0 enable}
2205 * To disable proxy arp on an individual interface:
2206 * @cliexcmd{set interface proxy-arp GigabitEthernet0/8/0 disable}
2208 VLIB_CLI_COMMAND (set_int_proxy_enable_command, static) = {
2209 .path = "set interface proxy-arp",
2211 "set interface proxy-arp <intfc> [enable|disable]",
2212 .function = set_int_proxy_arp_command_fn,
2218 * ARP/ND Termination in a L2 Bridge Domain based on IP4/IP6 to MAC
2219 * hash tables mac_by_ip4 and mac_by_ip6 for each BD.
2223 ARP_TERM_NEXT_L2_OUTPUT,
2228 u32 arp_term_next_node_index[32];
2231 arp_term_l2bd (vlib_main_t * vm,
2232 vlib_node_runtime_t * node, vlib_frame_t * frame)
2234 l2input_main_t *l2im = &l2input_main;
2235 u32 n_left_from, next_index, *from, *to_next;
2236 u32 n_replies_sent = 0;
2237 u16 last_bd_index = ~0;
2238 l2_bridge_domain_t *last_bd_config = 0;
2239 l2_input_config_t *cfg0;
2241 from = vlib_frame_vector_args (frame);
2242 n_left_from = frame->n_vectors;
2243 next_index = node->cached_next_index;
2245 while (n_left_from > 0)
2249 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2251 while (n_left_from > 0 && n_left_to_next > 0)
2254 ethernet_header_t *eth0;
2255 ethernet_arp_header_t *arp0;
2258 u32 pi0, error0, next0, sw_if_index0;
2270 n_left_to_next -= 1;
2272 p0 = vlib_get_buffer (vm, pi0);
2273 // Terminate only local (SHG == 0) ARP
2274 if (vnet_buffer (p0)->l2.shg != 0)
2275 goto next_l2_feature;
2277 eth0 = vlib_buffer_get_current (p0);
2278 l3h0 = (u8 *) eth0 + vnet_buffer (p0)->l2.l2_len;
2279 ethertype0 = clib_net_to_host_u16 (*(u16 *) (l3h0 - 2));
2280 arp0 = (ethernet_arp_header_t *) l3h0;
2282 if (PREDICT_FALSE ((ethertype0 != ETHERNET_TYPE_ARP) ||
2284 clib_host_to_net_u16
2285 (ETHERNET_ARP_OPCODE_request))))
2288 /* Must be ARP request packet here */
2289 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) &&
2290 (p0->flags & VLIB_BUFFER_IS_TRACED)))
2292 u8 *t0 = vlib_add_trace (vm, node, p0,
2293 sizeof (ethernet_arp_input_trace_t));
2294 clib_memcpy (t0, l3h0, sizeof (ethernet_arp_input_trace_t));
2297 error0 = ETHERNET_ARP_ERROR_replies_sent;
2300 clib_net_to_host_u16 (ETHERNET_ARP_HARDWARE_TYPE_ethernet)
2301 ? ETHERNET_ARP_ERROR_l2_type_not_ethernet : error0);
2304 clib_net_to_host_u16 (ETHERNET_TYPE_IP4) ?
2305 ETHERNET_ARP_ERROR_l3_type_not_ip4 : error0);
2307 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
2314 clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply))
2317 (arp0->ip4_over_ethernet[0].ethernet, vrrp_prefix,
2318 sizeof (vrrp_prefix))));
2320 /* Trash ARP packets whose ARP-level source addresses do not
2321 match their L2-frame-level source addresses, unless it's
2322 a reply from a VRRP virtual router */
2324 (memcmp (eth0->src_address, arp0->ip4_over_ethernet[0].ethernet,
2325 sizeof (eth0->src_address)) && !is_vrrp_reply0))
2327 error0 = ETHERNET_ARP_ERROR_l2_address_mismatch;
2331 /* Check if anyone want ARP request events for L2 BDs */
2333 ethernet_arp_main_t *am = ðernet_arp_main;
2334 if (am->wc_ip4_arp_publisher_node != (uword) ~ 0)
2335 vnet_arp_wc_publish (sw_if_index0, &arp0->ip4_over_ethernet[0]);
2338 /* lookup BD mac_by_ip4 hash table for MAC entry */
2339 ip0 = arp0->ip4_over_ethernet[1].ip4.as_u32;
2340 bd_index0 = vnet_buffer (p0)->l2.bd_index;
2341 if (PREDICT_FALSE ((bd_index0 != last_bd_index)
2342 || (last_bd_index == (u16) ~ 0)))
2344 last_bd_index = bd_index0;
2345 last_bd_config = vec_elt_at_index (l2im->bd_configs, bd_index0);
2347 macp0 = (u8 *) hash_get (last_bd_config->mac_by_ip4, ip0);
2349 if (PREDICT_FALSE (!macp0))
2350 goto next_l2_feature; /* MAC not found */
2352 /* MAC found, send ARP reply -
2353 Convert ARP request packet to ARP reply */
2354 arp0->opcode = clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply);
2355 arp0->ip4_over_ethernet[1] = arp0->ip4_over_ethernet[0];
2356 arp0->ip4_over_ethernet[0].ip4.as_u32 = ip0;
2357 clib_memcpy (arp0->ip4_over_ethernet[0].ethernet, macp0, 6);
2358 clib_memcpy (eth0->dst_address, eth0->src_address, 6);
2359 clib_memcpy (eth0->src_address, macp0, 6);
2360 n_replies_sent += 1;
2363 /* For BVI, need to use l2-fwd node to send ARP reply as
2364 l2-output node cannot output packet to BVI properly */
2365 cfg0 = vec_elt_at_index (l2im->configs, sw_if_index0);
2366 if (PREDICT_FALSE (cfg0->bvi))
2368 vnet_buffer (p0)->l2.feature_bitmap |= L2INPUT_FEAT_FWD;
2369 vnet_buffer (p0)->sw_if_index[VLIB_RX] = 0;
2370 goto next_l2_feature;
2373 /* Send ARP/ND reply back out input interface through l2-output */
2374 vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
2375 next0 = ARP_TERM_NEXT_L2_OUTPUT;
2376 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2377 to_next, n_left_to_next, pi0,
2382 /* IP6 ND event notification or solicitation handling to generate
2383 local response instead of flooding */
2384 iph0 = (ip6_header_t *) l3h0;
2385 if (PREDICT_FALSE (ethertype0 == ETHERNET_TYPE_IP6 &&
2386 iph0->protocol == IP_PROTOCOL_ICMP6 &&
2387 !ip6_address_is_unspecified
2388 (&iph0->src_address)))
2390 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
2391 if (vnet_ip6_nd_term
2392 (vm, node, p0, eth0, iph0, sw_if_index0,
2393 vnet_buffer (p0)->l2.bd_index))
2394 goto output_response;
2399 next0 = vnet_l2_feature_next (p0, arp_term_next_node_index,
2400 L2INPUT_FEAT_ARP_TERM);
2401 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2402 to_next, n_left_to_next,
2408 if (0 == arp0->ip4_over_ethernet[0].ip4.as_u32 ||
2409 (arp0->ip4_over_ethernet[0].ip4.as_u32 ==
2410 arp0->ip4_over_ethernet[1].ip4.as_u32))
2412 error0 = ETHERNET_ARP_ERROR_gratuitous_arp;
2414 next0 = ARP_TERM_NEXT_DROP;
2415 p0->error = node->errors[error0];
2417 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2418 to_next, n_left_to_next, pi0,
2422 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2425 vlib_error_count (vm, node->node_index,
2426 ETHERNET_ARP_ERROR_replies_sent, n_replies_sent);
2427 return frame->n_vectors;
2431 VLIB_REGISTER_NODE (arp_term_l2bd_node, static) = {
2432 .function = arp_term_l2bd,
2433 .name = "arp-term-l2bd",
2434 .vector_size = sizeof (u32),
2435 .n_errors = ETHERNET_ARP_N_ERROR,
2436 .error_strings = ethernet_arp_error_strings,
2437 .n_next_nodes = ARP_TERM_N_NEXT,
2439 [ARP_TERM_NEXT_L2_OUTPUT] = "l2-output",
2440 [ARP_TERM_NEXT_DROP] = "error-drop",
2442 .format_buffer = format_ethernet_arp_header,
2443 .format_trace = format_arp_term_input_trace,
2448 arp_term_init (vlib_main_t * vm)
2450 // Initialize the feature next-node indexes
2451 feat_bitmap_init_next_nodes (vm,
2452 arp_term_l2bd_node.index,
2454 l2input_get_feat_names (),
2455 arp_term_next_node_index);
2459 VLIB_INIT_FUNCTION (arp_term_init);
2462 change_arp_mac (u32 sw_if_index, ethernet_arp_ip4_entry_t * e)
2464 if (e->sw_if_index == sw_if_index)
2466 adj_nbr_walk_nh4 (e->sw_if_index,
2467 &e->ip4_address, arp_mk_complete_walk, e);
2472 ethernet_arp_change_mac (u32 sw_if_index)
2474 ethernet_arp_main_t *am = ðernet_arp_main;
2475 ethernet_arp_ip4_entry_t *e;
2478 pool_foreach (e, am->ip4_entry_pool,
2480 change_arp_mac (sw_if_index, e);
2486 send_ip4_garp (vlib_main_t * vm, vnet_hw_interface_t * hi)
2488 ip4_main_t *i4m = &ip4_main;
2489 u32 sw_if_index = hi->sw_if_index;
2490 ip4_address_t *ip4_addr = ip4_interface_first_address (i4m, sw_if_index, 0);
2494 clib_warning ("Sending GARP for IP4 address %U on sw_if_idex %d",
2495 format_ip4_address, ip4_addr, sw_if_index);
2497 /* Form GARP packet for output - Gratuitous ARP is an ARP request packet
2498 where the interface IP/MAC pair is used for both source and request
2499 MAC/IP pairs in the request */
2501 ethernet_arp_header_t *h = vlib_packet_template_get_packet
2502 (vm, &i4m->ip4_arp_request_packet_template, &bi);
2503 clib_memcpy (h->ip4_over_ethernet[0].ethernet, hi->hw_address,
2504 sizeof (h->ip4_over_ethernet[0].ethernet));
2505 clib_memcpy (h->ip4_over_ethernet[1].ethernet, hi->hw_address,
2506 sizeof (h->ip4_over_ethernet[1].ethernet));
2507 h->ip4_over_ethernet[0].ip4 = ip4_addr[0];
2508 h->ip4_over_ethernet[1].ip4 = ip4_addr[0];
2510 /* Setup MAC header with ARP Etype and broadcast DMAC */
2511 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
2512 vlib_buffer_advance (b, -sizeof (ethernet_header_t));
2513 ethernet_header_t *e = vlib_buffer_get_current (b);
2514 e->type = clib_host_to_net_u16 (ETHERNET_TYPE_ARP);
2515 clib_memcpy (e->src_address, hi->hw_address, sizeof (e->src_address));
2516 memset (e->dst_address, 0xff, sizeof (e->dst_address));
2518 /* Send GARP packet out the specified interface */
2519 vnet_buffer (b)->sw_if_index[VLIB_RX] =
2520 vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index;
2521 vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index);
2522 u32 *to_next = vlib_frame_vector_args (f);
2525 vlib_put_frame_to_node (vm, hi->output_node_index, f);
2530 * fd.io coding-style-patch-verification: ON
2533 * eval: (c-set-style "gnu")