2 * ethernet/arp.c: IP v4 ARP node
4 * Copyright (c) 2010 Cisco and/or its affiliates.
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at:
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
18 #include <vnet/ip/ip.h>
19 #include <vnet/ip/ip6.h>
20 #include <vnet/ethernet/ethernet.h>
21 #include <vnet/ethernet/arp_packet.h>
22 #include <vnet/l2/l2_input.h>
23 #include <vppinfra/mhash.h>
24 #include <vnet/fib/ip4_fib.h>
25 #include <vnet/adj/adj_nbr.h>
26 #include <vnet/adj/adj_mcast.h>
27 #include <vnet/mpls/mpls.h>
33 * This file contains code to manage the IPv4 ARP tables (IP Address
34 * to MAC Address lookup).
38 void vl_api_rpc_call_main_thread (void *fp, u8 * data, u32 data_length);
41 * @brief Per-interface ARP configuration and state
43 typedef struct ethernet_arp_interface_t_
46 * Hash table of ARP entries.
47 * Since this hash table is per-interface, the key is only the IPv4 address.
50 } ethernet_arp_interface_t;
57 } ethernet_proxy_arp_t;
65 /* Used for arp event notification only */
68 } pending_resolution_t;
72 /* Hash tables mapping name to opcode. */
73 uword *opcode_by_name;
75 /* lite beer "glean" adjacency handling */
76 uword *pending_resolutions_by_address;
77 pending_resolution_t *pending_resolutions;
79 /* Mac address change notification */
80 uword *mac_changes_by_address;
81 pending_resolution_t *mac_changes;
83 ethernet_arp_ip4_entry_t *ip4_entry_pool;
85 /* ARP attack mitigation */
87 u32 limit_arp_cache_size;
89 /** Per interface state */
90 ethernet_arp_interface_t *ethernet_arp_by_sw_if_index;
92 /* Proxy arp vector */
93 ethernet_proxy_arp_t *proxy_arps;
94 } ethernet_arp_main_t;
96 static ethernet_arp_main_t ethernet_arp_main;
101 ethernet_arp_ip4_over_ethernet_address_t a;
105 #define ETHERNET_ARP_ARGS_REMOVE (1<<0)
106 #define ETHERNET_ARP_ARGS_FLUSH (1<<1)
107 #define ETHERNET_ARP_ARGS_POPULATE (1<<2)
108 } vnet_arp_set_ip4_over_ethernet_rpc_args_t;
111 set_ip4_over_ethernet_rpc_callback (vnet_arp_set_ip4_over_ethernet_rpc_args_t
115 format_ethernet_arp_hardware_type (u8 * s, va_list * va)
117 ethernet_arp_hardware_type_t h = va_arg (*va, ethernet_arp_hardware_type_t);
121 #define _(n,f) case n: t = #f; break;
122 foreach_ethernet_arp_hardware_type;
126 return format (s, "unknown 0x%x", h);
129 return format (s, "%s", t);
133 format_ethernet_arp_opcode (u8 * s, va_list * va)
135 ethernet_arp_opcode_t o = va_arg (*va, ethernet_arp_opcode_t);
139 #define _(f) case ETHERNET_ARP_OPCODE_##f: t = #f; break;
140 foreach_ethernet_arp_opcode;
144 return format (s, "unknown 0x%x", o);
147 return format (s, "%s", t);
151 unformat_ethernet_arp_opcode_host_byte_order (unformat_input_t * input,
154 int *result = va_arg (*args, int *);
155 ethernet_arp_main_t *am = ðernet_arp_main;
158 /* Numeric opcode. */
159 if (unformat (input, "0x%x", &x) || unformat (input, "%d", &x))
168 if (unformat_user (input, unformat_vlib_number_by_name,
169 am->opcode_by_name, &i))
179 unformat_ethernet_arp_opcode_net_byte_order (unformat_input_t * input,
182 int *result = va_arg (*args, int *);
184 (input, unformat_ethernet_arp_opcode_host_byte_order, result))
187 *result = clib_host_to_net_u16 ((u16) * result);
192 format_ethernet_arp_header (u8 * s, va_list * va)
194 ethernet_arp_header_t *a = va_arg (*va, ethernet_arp_header_t *);
195 u32 max_header_bytes = va_arg (*va, u32);
197 u16 l2_type, l3_type;
199 if (max_header_bytes != 0 && sizeof (a[0]) > max_header_bytes)
200 return format (s, "ARP header truncated");
202 l2_type = clib_net_to_host_u16 (a->l2_type);
203 l3_type = clib_net_to_host_u16 (a->l3_type);
205 indent = format_get_indent (s);
207 s = format (s, "%U, type %U/%U, address size %d/%d",
208 format_ethernet_arp_opcode, clib_net_to_host_u16 (a->opcode),
209 format_ethernet_arp_hardware_type, l2_type,
210 format_ethernet_type, l3_type,
211 a->n_l2_address_bytes, a->n_l3_address_bytes);
213 if (l2_type == ETHERNET_ARP_HARDWARE_TYPE_ethernet
214 && l3_type == ETHERNET_TYPE_IP4)
216 s = format (s, "\n%U%U/%U -> %U/%U",
217 format_white_space, indent,
218 format_ethernet_address, a->ip4_over_ethernet[0].ethernet,
219 format_ip4_address, &a->ip4_over_ethernet[0].ip4,
220 format_ethernet_address, a->ip4_over_ethernet[1].ethernet,
221 format_ip4_address, &a->ip4_over_ethernet[1].ip4);
225 uword n2 = a->n_l2_address_bytes;
226 uword n3 = a->n_l3_address_bytes;
227 s = format (s, "\n%U%U/%U -> %U/%U",
228 format_white_space, indent,
229 format_hex_bytes, a->data + 0 * n2 + 0 * n3, n2,
230 format_hex_bytes, a->data + 1 * n2 + 0 * n3, n3,
231 format_hex_bytes, a->data + 1 * n2 + 1 * n3, n2,
232 format_hex_bytes, a->data + 2 * n2 + 1 * n3, n3);
239 format_ethernet_arp_ip4_entry (u8 * s, va_list * va)
241 vnet_main_t *vnm = va_arg (*va, vnet_main_t *);
242 ethernet_arp_ip4_entry_t *e = va_arg (*va, ethernet_arp_ip4_entry_t *);
243 vnet_sw_interface_t *si;
247 return format (s, "%=12s%=16s%=6s%=20s%=24s", "Time", "IP4",
248 "Flags", "Ethernet", "Interface");
250 si = vnet_get_sw_interface (vnm, e->sw_if_index);
252 if (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC)
253 flags = format (flags, "S");
255 if (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_DYNAMIC)
256 flags = format (flags, "D");
258 if (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_NO_FIB_ENTRY)
259 flags = format (flags, "N");
261 s = format (s, "%=12U%=16U%=6s%=20U%=24U",
262 format_vlib_cpu_time, vnm->vlib_main, e->cpu_time_last_updated,
263 format_ip4_address, &e->ip4_address,
264 flags ? (char *) flags : "",
265 format_ethernet_address, e->ethernet_address,
266 format_vnet_sw_interface_name, vnm, si);
275 } ethernet_arp_input_trace_t;
278 format_ethernet_arp_input_trace (u8 * s, va_list * va)
280 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
281 CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
282 ethernet_arp_input_trace_t *t = va_arg (*va, ethernet_arp_input_trace_t *);
285 format_ethernet_arp_header,
286 t->packet_data, sizeof (t->packet_data));
292 format_arp_term_input_trace (u8 * s, va_list * va)
294 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
295 CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
296 ethernet_arp_input_trace_t *t = va_arg (*va, ethernet_arp_input_trace_t *);
298 /* arp-term trace data saved is either arp or ip6/icmp6 packet:
299 - for arp, the 1st 16-bit field is hw type of value of 0x0001.
300 - for ip6, the first nibble has value of 6. */
301 s = format (s, "%U", t->packet_data[0] == 0 ?
302 format_ethernet_arp_header : format_ip6_header,
303 t->packet_data, sizeof (t->packet_data));
309 arp_nbr_probe (ip_adjacency_t * adj)
311 vnet_main_t *vnm = vnet_get_main ();
312 ip4_main_t *im = &ip4_main;
313 ip_interface_address_t *ia;
314 ethernet_arp_header_t *h;
315 vnet_hw_interface_t *hi;
316 vnet_sw_interface_t *si;
322 vm = vlib_get_main ();
324 si = vnet_get_sw_interface (vnm, adj->rewrite_header.sw_if_index);
326 if (!(si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
332 ip4_interface_address_matching_destination (im,
333 &adj->sub_type.nbr.next_hop.
343 vlib_packet_template_get_packet (vm, &im->ip4_arp_request_packet_template,
346 hi = vnet_get_sup_hw_interface (vnm, adj->rewrite_header.sw_if_index);
348 clib_memcpy (h->ip4_over_ethernet[0].ethernet,
349 hi->hw_address, sizeof (h->ip4_over_ethernet[0].ethernet));
351 h->ip4_over_ethernet[0].ip4 = src[0];
352 h->ip4_over_ethernet[1].ip4 = adj->sub_type.nbr.next_hop.ip4;
354 b = vlib_get_buffer (vm, bi);
355 vnet_buffer (b)->sw_if_index[VLIB_RX] =
356 vnet_buffer (b)->sw_if_index[VLIB_TX] = adj->rewrite_header.sw_if_index;
358 /* Add encapsulation string for software interface (e.g. ethernet header). */
359 vnet_rewrite_one_header (adj[0], h, sizeof (ethernet_header_t));
360 vlib_buffer_advance (b, -adj->rewrite_header.data_bytes);
363 vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index);
364 u32 *to_next = vlib_frame_vector_args (f);
367 vlib_put_frame_to_node (vm, hi->output_node_index, f);
372 arp_mk_complete (adj_index_t ai, ethernet_arp_ip4_entry_t * e)
374 adj_nbr_update_rewrite
375 (ai, ADJ_NBR_REWRITE_FLAG_COMPLETE,
376 ethernet_build_rewrite (vnet_get_main (),
378 adj_get_link_type (ai), e->ethernet_address));
382 arp_mk_incomplete (adj_index_t ai)
384 ip_adjacency_t *adj = adj_get (ai);
386 adj_nbr_update_rewrite
388 ADJ_NBR_REWRITE_FLAG_INCOMPLETE,
389 ethernet_build_rewrite (vnet_get_main (),
390 adj->rewrite_header.sw_if_index,
392 VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST));
395 static ethernet_arp_ip4_entry_t *
396 arp_entry_find (ethernet_arp_interface_t * eai, const ip4_address_t * addr)
398 ethernet_arp_main_t *am = ðernet_arp_main;
399 ethernet_arp_ip4_entry_t *e = NULL;
402 if (NULL != eai->arp_entries)
404 p = hash_get (eai->arp_entries, addr->as_u32);
408 e = pool_elt_at_index (am->ip4_entry_pool, p[0]);
415 arp_mk_complete_walk (adj_index_t ai, void *ctx)
417 ethernet_arp_ip4_entry_t *e = ctx;
419 arp_mk_complete (ai, e);
421 return (ADJ_WALK_RC_CONTINUE);
425 arp_mk_incomplete_walk (adj_index_t ai, void *ctx)
427 arp_mk_incomplete (ai);
429 return (ADJ_WALK_RC_CONTINUE);
433 arp_update_adjacency (vnet_main_t * vnm, u32 sw_if_index, u32 ai)
435 ethernet_arp_main_t *am = ðernet_arp_main;
436 ethernet_arp_interface_t *arp_int;
437 ethernet_arp_ip4_entry_t *e;
442 vec_validate (am->ethernet_arp_by_sw_if_index, sw_if_index);
443 arp_int = &am->ethernet_arp_by_sw_if_index[sw_if_index];
444 e = arp_entry_find (arp_int, &adj->sub_type.nbr.next_hop.ip4);
446 switch (adj->lookup_next_index)
448 case IP_LOOKUP_NEXT_ARP:
449 case IP_LOOKUP_NEXT_GLEAN:
452 adj_nbr_walk_nh4 (sw_if_index,
453 &e->ip4_address, arp_mk_complete_walk, e);
458 * no matching ARP entry.
459 * construct the rewrite required to for an ARP packet, and stick
460 * that in the adj's pipe to smoke.
462 adj_nbr_update_rewrite
464 ADJ_NBR_REWRITE_FLAG_INCOMPLETE,
465 ethernet_build_rewrite
469 VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST));
472 * since the FIB has added this adj for a route, it makes sense it
473 * may want to forward traffic sometime soon. Let's send a
474 * speculative ARP. just one. If we were to do periodically that
475 * wouldn't be bad either, but that's more code than i'm prepared to
476 * write at this time for relatively little reward.
481 case IP_LOOKUP_NEXT_MCAST:
484 * Construct a partial rewrite from the known ethernet mcast dest MAC
489 rewrite = ethernet_build_rewrite (vnm,
492 ethernet_ip4_mcast_dst_addr ());
493 offset = vec_len (rewrite) - 2;
496 * Complete the remaining fields of the adj's rewrite to direct the
497 * complete of the rewrite at switch time by copying in the IP
498 * dst address's bytes.
499 * Ofset is 2 bytes into the MAC desintation address. And we copy 23 bits
502 adj_mcast_update_rewrite (ai, rewrite, offset, 0x007fffff);
506 case IP_LOOKUP_NEXT_DROP:
507 case IP_LOOKUP_NEXT_PUNT:
508 case IP_LOOKUP_NEXT_LOCAL:
509 case IP_LOOKUP_NEXT_REWRITE:
510 case IP_LOOKUP_NEXT_LOAD_BALANCE:
511 case IP_LOOKUP_NEXT_MIDCHAIN:
512 case IP_LOOKUP_NEXT_ICMP_ERROR:
513 case IP_LOOKUP_N_NEXT:
520 vnet_arp_set_ip4_over_ethernet_internal (vnet_main_t * vnm,
521 vnet_arp_set_ip4_over_ethernet_rpc_args_t
524 ethernet_arp_ip4_entry_t *e = 0;
525 ethernet_arp_main_t *am = ðernet_arp_main;
526 ethernet_arp_ip4_over_ethernet_address_t *a = &args->a;
527 vlib_main_t *vm = vlib_get_main ();
528 int make_new_arp_cache_entry = 1;
530 pending_resolution_t *pr, *mc;
531 ethernet_arp_interface_t *arp_int;
532 int is_static = args->is_static;
533 u32 sw_if_index = args->sw_if_index;
534 int is_no_fib_entry = args->is_no_fib_entry;
536 vec_validate (am->ethernet_arp_by_sw_if_index, sw_if_index);
538 arp_int = &am->ethernet_arp_by_sw_if_index[sw_if_index];
540 if (NULL != arp_int->arp_entries)
542 p = hash_get (arp_int->arp_entries, a->ip4.as_u32);
545 e = pool_elt_at_index (am->ip4_entry_pool, p[0]);
547 /* Refuse to over-write static arp. */
548 if (!is_static && (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC))
550 make_new_arp_cache_entry = 0;
554 if (make_new_arp_cache_entry)
556 pool_get (am->ip4_entry_pool, e);
558 if (NULL == arp_int->arp_entries)
560 arp_int->arp_entries = hash_create (0, sizeof (u32));
563 hash_set (arp_int->arp_entries, a->ip4.as_u32, e - am->ip4_entry_pool);
565 e->sw_if_index = sw_if_index;
566 e->ip4_address = a->ip4;
567 clib_memcpy (e->ethernet_address,
568 a->ethernet, sizeof (e->ethernet_address));
570 if (!is_no_fib_entry)
574 .fp_proto = FIB_PROTOCOL_IP4,
575 .fp_addr.ip4 = a->ip4,
580 ip4_fib_table_get_index_for_sw_if_index (e->sw_if_index);
582 fib_table_entry_update_one_path (fib_index, &pfx, FIB_SOURCE_ADJ,
583 FIB_ENTRY_FLAG_ATTACHED,
584 FIB_PROTOCOL_IP4, &pfx.fp_addr,
585 e->sw_if_index, ~0, 1, NULL,
586 FIB_ROUTE_PATH_FLAG_NONE);
587 e->flags |= ETHERNET_ARP_IP4_ENTRY_FLAG_NO_FIB_ENTRY;
593 * prevent a DoS attack from the data-plane that
594 * spams us with no-op updates to the MAC address
596 if (0 == memcmp (e->ethernet_address,
597 a->ethernet, sizeof (e->ethernet_address)))
600 /* Update time stamp and ethernet address. */
601 clib_memcpy (e->ethernet_address, a->ethernet,
602 sizeof (e->ethernet_address));
605 e->cpu_time_last_updated = clib_cpu_time_now ();
607 e->flags |= ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC;
609 e->flags |= ETHERNET_ARP_IP4_ENTRY_FLAG_DYNAMIC;
611 adj_nbr_walk_nh4 (sw_if_index, &e->ip4_address, arp_mk_complete_walk, e);
613 /* Customer(s) waiting for this address to be resolved? */
614 p = hash_get (am->pending_resolutions_by_address, a->ip4.as_u32);
620 while (next_index != (u32) ~ 0)
622 pr = pool_elt_at_index (am->pending_resolutions, next_index);
623 vlib_process_signal_event (vm, pr->node_index,
624 pr->type_opaque, pr->data);
625 next_index = pr->next_index;
626 pool_put (am->pending_resolutions, pr);
629 hash_unset (am->pending_resolutions_by_address, a->ip4.as_u32);
632 /* Customer(s) requesting ARP event for this address? */
633 p = hash_get (am->mac_changes_by_address, a->ip4.as_u32);
639 while (next_index != (u32) ~ 0)
641 int (*fp) (u32, u8 *, u32, u32);
643 mc = pool_elt_at_index (am->mac_changes, next_index);
644 fp = mc->data_callback;
646 /* Call the user's data callback, return 1 to suppress dup events */
648 rv = (*fp) (mc->data, a->ethernet, sw_if_index, 0);
651 * Signal the resolver process, as long as the user
652 * says they want to be notified
655 vlib_process_signal_event (vm, mc->node_index,
656 mc->type_opaque, mc->data);
657 next_index = mc->next_index;
665 vnet_register_ip4_arp_resolution_event (vnet_main_t * vnm,
668 uword type_opaque, uword data)
670 ethernet_arp_main_t *am = ðernet_arp_main;
671 ip4_address_t *address = address_arg;
673 pending_resolution_t *pr;
675 pool_get (am->pending_resolutions, pr);
678 pr->node_index = node_index;
679 pr->type_opaque = type_opaque;
681 pr->data_callback = 0;
683 p = hash_get (am->pending_resolutions_by_address, address->as_u32);
686 /* Insert new resolution at the head of the list */
687 pr->next_index = p[0];
688 hash_unset (am->pending_resolutions_by_address, address->as_u32);
691 hash_set (am->pending_resolutions_by_address, address->as_u32,
692 pr - am->pending_resolutions);
696 vnet_add_del_ip4_arp_change_event (vnet_main_t * vnm,
701 uword type_opaque, uword data, int is_add)
703 ethernet_arp_main_t *am = ðernet_arp_main;
704 ip4_address_t *address = address_arg;
706 /* Try to find an existing entry */
707 u32 *first = (u32 *) hash_get (am->mac_changes_by_address, address->as_u32);
709 pending_resolution_t *mc;
710 while (p && *p != ~0)
712 mc = pool_elt_at_index (am->mac_changes, *p);
713 if (mc->node_index == node_index && mc->type_opaque == type_opaque
719 int found = p && *p != ~0;
723 return VNET_API_ERROR_ENTRY_ALREADY_EXISTS;
725 pool_get (am->mac_changes, mc);
726 *mc = (pending_resolution_t)
728 .next_index = ~0,.node_index = node_index,.type_opaque =
729 type_opaque,.data = data,.data_callback = data_callback,.pid =
732 /* Insert new resolution at the end of the list */
733 u32 new_idx = mc - am->mac_changes;
737 hash_set (am->mac_changes_by_address, address->as_u32, new_idx);
742 return VNET_API_ERROR_NO_SUCH_ENTRY;
744 /* Clients may need to clean up pool entries, too */
745 void (*fp) (u32, u8 *) = data_callback;
747 (*fp) (mc->data, 0 /* no new mac addrs */ );
749 /* Remove the entry from the list and delete the entry */
751 pool_put (am->mac_changes, mc);
753 /* Remove from hash if we deleted the last entry */
754 if (*p == ~0 && p == first)
755 hash_unset (am->mac_changes_by_address, address->as_u32);
760 /* Either we drop the packet or we send a reply to the sender. */
764 ARP_INPUT_NEXT_REPLY_TX,
768 #define foreach_ethernet_arp_error \
769 _ (replies_sent, "ARP replies sent") \
770 _ (l2_type_not_ethernet, "L2 type not ethernet") \
771 _ (l3_type_not_ip4, "L3 type not IP4") \
772 _ (l3_src_address_not_local, "IP4 source address not local to subnet") \
773 _ (l3_dst_address_not_local, "IP4 destination address not local to subnet") \
774 _ (l3_src_address_is_local, "IP4 source address matches local interface") \
775 _ (l3_src_address_learned, "ARP request IP4 source address learned") \
776 _ (replies_received, "ARP replies received") \
777 _ (opcode_not_request, "ARP opcode not request") \
778 _ (proxy_arp_replies_sent, "Proxy ARP replies sent") \
779 _ (l2_address_mismatch, "ARP hw addr does not match L2 frame src addr") \
780 _ (missing_interface_address, "ARP missing interface address") \
781 _ (gratuitous_arp, "ARP probe or announcement dropped") \
782 _ (interface_no_table, "Interface is not mapped to an IP table") \
783 _ (interface_not_ip_enabled, "Interface is not IP enabled") \
787 #define _(sym,string) ETHERNET_ARP_ERROR_##sym,
788 foreach_ethernet_arp_error
790 ETHERNET_ARP_N_ERROR,
791 } ethernet_arp_input_error_t;
795 unset_random_arp_entry (void)
797 ethernet_arp_main_t *am = ðernet_arp_main;
798 ethernet_arp_ip4_entry_t *e;
799 vnet_main_t *vnm = vnet_get_main ();
800 ethernet_arp_ip4_over_ethernet_address_t delme;
803 index = pool_next_index (am->ip4_entry_pool, am->arp_delete_rotor);
804 am->arp_delete_rotor = index;
806 /* Try again from elt 0, could happen if an intfc goes down */
809 index = pool_next_index (am->ip4_entry_pool, am->arp_delete_rotor);
810 am->arp_delete_rotor = index;
813 /* Nothing left in the pool */
817 e = pool_elt_at_index (am->ip4_entry_pool, index);
819 clib_memcpy (&delme.ethernet, e->ethernet_address, 6);
820 delme.ip4.as_u32 = e->ip4_address.as_u32;
822 vnet_arp_unset_ip4_over_ethernet (vnm, e->sw_if_index, &delme);
826 arp_unnumbered (vlib_buffer_t * p0,
827 u32 pi0, ethernet_header_t * eth0, u32 sw_if_index)
829 vlib_main_t *vm = vlib_get_main ();
830 vnet_main_t *vnm = vnet_get_main ();
831 vnet_interface_main_t *vim = &vnm->interface_main;
832 vnet_sw_interface_t *si;
833 vnet_hw_interface_t *hi;
834 u32 unnum_src_sw_if_index;
835 u32 *broadcast_swifs = 0;
840 u8 dst_mac_address[6];
842 ethernet_arp_header_t *arp0;
844 /* Save the dst mac address */
845 clib_memcpy (dst_mac_address, eth0->dst_address, sizeof (dst_mac_address));
847 /* Figure out which sw_if_index supplied the address */
848 unnum_src_sw_if_index = sw_if_index;
850 /* Track down all users of the unnumbered source */
852 pool_foreach (si, vim->sw_interfaces,
854 if (si->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED &&
855 (si->unnumbered_sw_if_index == unnum_src_sw_if_index))
857 vec_add1 (broadcast_swifs, si->sw_if_index);
862 /* If there are no interfaces un-unmbered to this interface,
864 if (0 == vec_len (broadcast_swifs))
867 /* Allocate buffering if we need it */
868 if (vec_len (broadcast_swifs) > 1)
870 vec_validate (buffers, vec_len (broadcast_swifs) - 2);
871 n_alloc = vlib_buffer_alloc (vm, buffers, vec_len (buffers));
872 _vec_len (buffers) = n_alloc;
873 for (i = 0; i < n_alloc; i++)
875 b0 = vlib_get_buffer (vm, buffers[i]);
877 /* xerox (partially built) ARP pkt */
878 clib_memcpy (b0->data, p0->data,
879 p0->current_length + p0->current_data);
880 b0->current_data = p0->current_data;
881 b0->current_length = p0->current_length;
882 vnet_buffer (b0)->sw_if_index[VLIB_RX] =
883 vnet_buffer (p0)->sw_if_index[VLIB_RX];
887 vec_insert (buffers, 1, 0);
890 for (i = 0; i < vec_len (buffers); i++)
892 b0 = vlib_get_buffer (vm, buffers[i]);
893 arp0 = vlib_buffer_get_current (b0);
895 hi = vnet_get_sup_hw_interface (vnm, broadcast_swifs[i]);
896 si = vnet_get_sw_interface (vnm, broadcast_swifs[i]);
898 /* For decoration, most likely */
899 vnet_buffer (b0)->sw_if_index[VLIB_TX] = hi->sw_if_index;
901 /* Fix ARP pkt src address */
902 clib_memcpy (arp0->ip4_over_ethernet[0].ethernet, hi->hw_address, 6);
904 /* Build L2 encaps for this swif */
905 header_size = sizeof (ethernet_header_t);
906 if (si->sub.eth.flags.one_tag)
908 else if (si->sub.eth.flags.two_tags)
911 vlib_buffer_advance (b0, -header_size);
912 eth0 = vlib_buffer_get_current (b0);
914 if (si->sub.eth.flags.one_tag)
916 ethernet_vlan_header_t *outer = (void *) (eth0 + 1);
918 eth0->type = si->sub.eth.flags.dot1ad ?
919 clib_host_to_net_u16 (ETHERNET_TYPE_DOT1AD) :
920 clib_host_to_net_u16 (ETHERNET_TYPE_VLAN);
921 outer->priority_cfi_and_id =
922 clib_host_to_net_u16 (si->sub.eth.outer_vlan_id);
923 outer->type = clib_host_to_net_u16 (ETHERNET_TYPE_ARP);
926 else if (si->sub.eth.flags.two_tags)
928 ethernet_vlan_header_t *outer = (void *) (eth0 + 1);
929 ethernet_vlan_header_t *inner = (void *) (outer + 1);
931 eth0->type = si->sub.eth.flags.dot1ad ?
932 clib_host_to_net_u16 (ETHERNET_TYPE_DOT1AD) :
933 clib_host_to_net_u16 (ETHERNET_TYPE_VLAN);
934 outer->priority_cfi_and_id =
935 clib_host_to_net_u16 (si->sub.eth.outer_vlan_id);
936 outer->type = clib_host_to_net_u16 (ETHERNET_TYPE_VLAN);
937 inner->priority_cfi_and_id =
938 clib_host_to_net_u16 (si->sub.eth.inner_vlan_id);
939 inner->type = clib_host_to_net_u16 (ETHERNET_TYPE_ARP);
944 eth0->type = clib_host_to_net_u16 (ETHERNET_TYPE_ARP);
947 /* Restore the original dst address, set src address */
948 clib_memcpy (eth0->dst_address, dst_mac_address,
949 sizeof (eth0->dst_address));
950 clib_memcpy (eth0->src_address, hi->hw_address,
951 sizeof (eth0->src_address));
953 /* Transmit replicas */
957 vlib_get_frame_to_node (vm, hi->output_node_index);
958 u32 *to_next = vlib_frame_vector_args (f);
959 to_next[0] = buffers[i];
961 vlib_put_frame_to_node (vm, hi->output_node_index, f);
965 /* The regular path outputs the original pkt.. */
966 vnet_buffer (p0)->sw_if_index[VLIB_TX] = broadcast_swifs[0];
968 vec_free (broadcast_swifs);
975 arp_input (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
977 ethernet_arp_main_t *am = ðernet_arp_main;
978 vnet_main_t *vnm = vnet_get_main ();
979 ip4_main_t *im4 = &ip4_main;
980 u32 n_left_from, next_index, *from, *to_next;
981 u32 n_replies_sent = 0, n_proxy_arp_replies_sent = 0;
983 from = vlib_frame_vector_args (frame);
984 n_left_from = frame->n_vectors;
985 next_index = node->cached_next_index;
987 if (node->flags & VLIB_NODE_FLAG_TRACE)
988 vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
990 sizeof (ethernet_arp_input_trace_t));
992 while (n_left_from > 0)
996 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
998 while (n_left_from > 0 && n_left_to_next > 0)
1001 vnet_hw_interface_t *hw_if0;
1002 ethernet_arp_header_t *arp0;
1003 ethernet_header_t *eth0;
1004 ip4_address_t *if_addr0, proxy_src;
1005 u32 pi0, error0, next0, sw_if_index0, conn_sw_if_index0, fib_index0;
1006 u8 is_request0, dst_is_local0, is_unnum0;
1007 ethernet_proxy_arp_t *pa;
1008 fib_node_index_t dst_fei, src_fei;
1010 fib_entry_flag_t src_flags, dst_flags;
1017 n_left_to_next -= 1;
1020 p0 = vlib_get_buffer (vm, pi0);
1021 arp0 = vlib_buffer_get_current (p0);
1023 is_request0 = arp0->opcode
1024 == clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_request);
1026 error0 = ETHERNET_ARP_ERROR_replies_sent;
1030 clib_net_to_host_u16 (ETHERNET_ARP_HARDWARE_TYPE_ethernet) ?
1031 ETHERNET_ARP_ERROR_l2_type_not_ethernet : error0);
1034 clib_net_to_host_u16 (ETHERNET_TYPE_IP4) ?
1035 ETHERNET_ARP_ERROR_l3_type_not_ip4 : error0);
1037 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
1039 /* not playing the ARP game if the interface is not IPv4 enabled */
1041 (im4->ip_enabled_by_sw_if_index[sw_if_index0] == 0 ?
1042 ETHERNET_ARP_ERROR_interface_not_ip_enabled : error0);
1047 /* Check that IP address is local and matches incoming interface. */
1048 fib_index0 = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);
1049 if (~0 == fib_index0)
1051 error0 = ETHERNET_ARP_ERROR_interface_no_table;
1055 dst_fei = ip4_fib_table_lookup (ip4_fib_get (fib_index0),
1056 &arp0->ip4_over_ethernet[1].ip4,
1058 dst_flags = fib_entry_get_flags (dst_fei);
1060 src_fei = ip4_fib_table_lookup (ip4_fib_get (fib_index0),
1061 &arp0->ip4_over_ethernet[0].ip4,
1063 src_flags = fib_entry_get_flags (src_fei);
1065 conn_sw_if_index0 = fib_entry_get_resolving_interface (dst_fei);
1067 if (!(FIB_ENTRY_FLAG_CONNECTED & dst_flags))
1069 error0 = ETHERNET_ARP_ERROR_l3_dst_address_not_local;
1073 /* Honor unnumbered interface, if any */
1074 is_unnum0 = sw_if_index0 != conn_sw_if_index0;
1076 /* Source must also be local to subnet of matching interface address. */
1077 if (!((FIB_ENTRY_FLAG_ATTACHED & src_flags) ||
1078 (FIB_ENTRY_FLAG_CONNECTED & src_flags)))
1081 * The packet was sent from an address that is not connected nor attached
1082 * i.e. it is not from an address that is covered by a link's sub-net,
1083 * nor is it a already learned host resp.
1085 error0 = ETHERNET_ARP_ERROR_l3_src_address_not_local;
1088 if (sw_if_index0 != fib_entry_get_resolving_interface (src_fei))
1091 * The interface the ARP was received on is not the interface
1092 * on which the covering prefix is configured. Maybe this is a case
1098 /* Reject requests/replies with our local interface address. */
1099 if (FIB_ENTRY_FLAG_LOCAL & src_flags)
1101 error0 = ETHERNET_ARP_ERROR_l3_src_address_is_local;
1105 dst_is_local0 = (FIB_ENTRY_FLAG_LOCAL & dst_flags);
1106 fib_entry_get_prefix (dst_fei, &pfx0);
1107 if_addr0 = &pfx0.fp_addr.ip4;
1109 /* Fill in ethernet header. */
1110 eth0 = ethernet_buffer_get_header (p0);
1112 /* Trash ARP packets whose ARP-level source addresses do not
1113 match their L2-frame-level source addresses */
1114 if (memcmp (eth0->src_address, arp0->ip4_over_ethernet[0].ethernet,
1115 sizeof (eth0->src_address)))
1117 error0 = ETHERNET_ARP_ERROR_l2_address_mismatch;
1121 /* Learn or update sender's mapping only for requests or unicasts
1122 that don't match local interface address. */
1123 if (ethernet_address_cast (eth0->dst_address) ==
1124 ETHERNET_ADDRESS_UNICAST || is_request0)
1126 if (am->limit_arp_cache_size &&
1127 pool_elts (am->ip4_entry_pool) >= am->limit_arp_cache_size)
1128 unset_random_arp_entry ();
1130 vnet_arp_set_ip4_over_ethernet (vnm, sw_if_index0,
1131 &arp0->ip4_over_ethernet[0],
1132 0 /* is_static */ , 0);
1133 error0 = ETHERNET_ARP_ERROR_l3_src_address_learned;
1136 /* Only send a reply for requests sent which match a local interface. */
1137 if (!(is_request0 && dst_is_local0))
1141 clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply) ?
1142 ETHERNET_ARP_ERROR_replies_received : error0);
1148 vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
1149 hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
1151 /* Send reply back through input interface */
1152 vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
1153 next0 = ARP_INPUT_NEXT_REPLY_TX;
1155 arp0->opcode = clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply);
1157 arp0->ip4_over_ethernet[1] = arp0->ip4_over_ethernet[0];
1159 clib_memcpy (arp0->ip4_over_ethernet[0].ethernet,
1160 hw_if0->hw_address, 6);
1161 clib_mem_unaligned (&arp0->ip4_over_ethernet[0].ip4.data_u32, u32) =
1164 /* Hardware must be ethernet-like. */
1165 ASSERT (vec_len (hw_if0->hw_address) == 6);
1167 clib_memcpy (eth0->dst_address, eth0->src_address, 6);
1168 clib_memcpy (eth0->src_address, hw_if0->hw_address, 6);
1170 /* Figure out how much to rewind current data from adjacency. */
1171 /* get the adj from the destination's covering connected */
1176 if (!arp_unnumbered (p0, pi0, eth0, conn_sw_if_index0))
1181 ip_adjacency_t *adj0 = NULL;
1184 if (FIB_ENTRY_FLAG_ATTACHED & src_flags)
1187 * If the source is attached use the adj from that source.
1189 ai = fib_entry_get_adj (src_fei);
1190 if (ADJ_INDEX_INVALID != ai)
1192 adj0 = adj_get (ai);
1198 * Get the glean adj from the cover. This is presumably interface
1199 * sourced, and therefre needs to be a glean adj.
1201 ai = fib_entry_get_adj_for_source
1202 (ip4_fib_table_lookup
1203 (ip4_fib_get (fib_index0),
1204 &arp0->ip4_over_ethernet[1].ip4, 31),
1205 FIB_SOURCE_INTERFACE);
1207 if (ADJ_INDEX_INVALID != ai)
1209 adj0 = adj_get (ai);
1211 if (adj0->lookup_next_index == IP_LOOKUP_NEXT_GLEAN)
1219 vlib_buffer_advance (p0,
1220 -adj0->rewrite_header.data_bytes);
1224 error0 = ETHERNET_ARP_ERROR_missing_interface_address;
1230 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1231 n_left_to_next, pi0, next0);
1233 n_replies_sent += 1;
1237 if (0 == arp0->ip4_over_ethernet[0].ip4.as_u32 ||
1238 (arp0->ip4_over_ethernet[0].ip4.as_u32 ==
1239 arp0->ip4_over_ethernet[1].ip4.as_u32))
1241 error0 = ETHERNET_ARP_ERROR_gratuitous_arp;
1244 /* See if proxy arp is configured for the address */
1247 vnet_sw_interface_t *si;
1248 u32 this_addr = clib_net_to_host_u32
1249 (arp0->ip4_over_ethernet[1].ip4.as_u32);
1252 si = vnet_get_sw_interface (vnm, sw_if_index0);
1254 if (!(si->flags & VNET_SW_INTERFACE_FLAG_PROXY_ARP))
1257 fib_index0 = vec_elt (im4->fib_index_by_sw_if_index,
1260 vec_foreach (pa, am->proxy_arps)
1262 u32 lo_addr = clib_net_to_host_u32 (pa->lo_addr);
1263 u32 hi_addr = clib_net_to_host_u32 (pa->hi_addr);
1265 /* an ARP request hit in the proxy-arp table? */
1266 if ((this_addr >= lo_addr && this_addr <= hi_addr) &&
1267 (fib_index0 == pa->fib_index))
1269 eth0 = ethernet_buffer_get_header (p0);
1271 arp0->ip4_over_ethernet[1].ip4.data_u32;
1274 * Rewind buffer, direct code above not to
1275 * think too hard about it.
1277 if_addr0 = &proxy_src;
1279 i32 ethernet_start =
1280 vnet_buffer (p0)->ethernet.start_of_ethernet_header;
1281 i32 rewind = p0->current_data - ethernet_start;
1282 vlib_buffer_advance (p0, -rewind);
1283 n_proxy_arp_replies_sent++;
1291 next0 = ARP_INPUT_NEXT_DROP;
1292 p0->error = node->errors[error0];
1294 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1295 n_left_to_next, pi0, next0);
1298 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1301 vlib_error_count (vm, node->node_index,
1302 ETHERNET_ARP_ERROR_replies_sent,
1303 n_replies_sent - n_proxy_arp_replies_sent);
1305 vlib_error_count (vm, node->node_index,
1306 ETHERNET_ARP_ERROR_proxy_arp_replies_sent,
1307 n_proxy_arp_replies_sent);
1308 return frame->n_vectors;
1311 static char *ethernet_arp_error_strings[] = {
1312 #define _(sym,string) string,
1313 foreach_ethernet_arp_error
1318 VLIB_REGISTER_NODE (arp_input_node, static) =
1320 .function = arp_input,
1321 .name = "arp-input",
1322 .vector_size = sizeof (u32),
1323 .n_errors = ETHERNET_ARP_N_ERROR,
1324 .error_strings = ethernet_arp_error_strings,
1325 .n_next_nodes = ARP_INPUT_N_NEXT,
1327 [ARP_INPUT_NEXT_DROP] = "error-drop",
1328 [ARP_INPUT_NEXT_REPLY_TX] = "interface-output",
1330 .format_buffer = format_ethernet_arp_header,
1331 .format_trace = format_ethernet_arp_input_trace,
1336 ip4_arp_entry_sort (void *a1, void *a2)
1338 ethernet_arp_ip4_entry_t *e1 = a1;
1339 ethernet_arp_ip4_entry_t *e2 = a2;
1342 vnet_main_t *vnm = vnet_get_main ();
1344 cmp = vnet_sw_interface_compare (vnm, e1->sw_if_index, e2->sw_if_index);
1346 cmp = ip4_address_compare (&e1->ip4_address, &e2->ip4_address);
1350 ethernet_arp_ip4_entry_t *
1351 ip4_neighbor_entries (u32 sw_if_index)
1353 ethernet_arp_main_t *am = ðernet_arp_main;
1354 ethernet_arp_ip4_entry_t *n, *ns = 0;
1357 pool_foreach (n, am->ip4_entry_pool, ({
1358 if (sw_if_index != ~0 && n->sw_if_index != sw_if_index)
1360 vec_add1 (ns, n[0]);
1365 vec_sort_with_function (ns, ip4_arp_entry_sort);
1369 static clib_error_t *
1370 show_ip4_arp (vlib_main_t * vm,
1371 unformat_input_t * input, vlib_cli_command_t * cmd)
1373 vnet_main_t *vnm = vnet_get_main ();
1374 ethernet_arp_main_t *am = ðernet_arp_main;
1375 ethernet_arp_ip4_entry_t *e, *es;
1376 ethernet_proxy_arp_t *pa;
1377 clib_error_t *error = 0;
1380 /* Filter entries by interface if given. */
1382 (void) unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index);
1384 es = ip4_neighbor_entries (sw_if_index);
1387 vlib_cli_output (vm, "%U", format_ethernet_arp_ip4_entry, vnm, 0);
1390 vlib_cli_output (vm, "%U", format_ethernet_arp_ip4_entry, vnm, e);
1395 if (vec_len (am->proxy_arps))
1397 vlib_cli_output (vm, "Proxy arps enabled for:");
1398 vec_foreach (pa, am->proxy_arps)
1400 vlib_cli_output (vm, "Fib_index %d %U - %U ",
1402 format_ip4_address, &pa->lo_addr,
1403 format_ip4_address, &pa->hi_addr);
1411 * Display all the IPv4 ARP entries.
1414 * Example of how to display the IPv4 ARP table:
1415 * @cliexstart{show ip arp}
1416 * Time FIB IP4 Flags Ethernet Interface
1417 * 346.3028 0 6.1.1.3 de:ad:be:ef:ba:be GigabitEthernet2/0/0
1418 * 3077.4271 0 6.1.1.4 S de:ad:be:ef:ff:ff GigabitEthernet2/0/0
1419 * 2998.6409 1 6.2.2.3 de:ad:be:ef:00:01 GigabitEthernet2/0/0
1420 * Proxy arps enabled for:
1421 * Fib_index 0 6.0.0.1 - 6.0.0.11
1425 VLIB_CLI_COMMAND (show_ip4_arp_command, static) = {
1426 .path = "show ip arp",
1427 .function = show_ip4_arp,
1428 .short_help = "show ip arp",
1434 pg_edit_t l2_type, l3_type;
1435 pg_edit_t n_l2_address_bytes, n_l3_address_bytes;
1441 } ip4_over_ethernet[2];
1442 } pg_ethernet_arp_header_t;
1445 pg_ethernet_arp_header_init (pg_ethernet_arp_header_t * p)
1447 /* Initialize fields that are not bit fields in the IP header. */
1448 #define _(f) pg_edit_init (&p->f, ethernet_arp_header_t, f);
1451 _(n_l2_address_bytes);
1452 _(n_l3_address_bytes);
1454 _(ip4_over_ethernet[0].ethernet);
1455 _(ip4_over_ethernet[0].ip4);
1456 _(ip4_over_ethernet[1].ethernet);
1457 _(ip4_over_ethernet[1].ip4);
1462 unformat_pg_arp_header (unformat_input_t * input, va_list * args)
1464 pg_stream_t *s = va_arg (*args, pg_stream_t *);
1465 pg_ethernet_arp_header_t *p;
1468 p = pg_create_edit_group (s, sizeof (p[0]), sizeof (ethernet_arp_header_t),
1470 pg_ethernet_arp_header_init (p);
1473 pg_edit_set_fixed (&p->l2_type, ETHERNET_ARP_HARDWARE_TYPE_ethernet);
1474 pg_edit_set_fixed (&p->l3_type, ETHERNET_TYPE_IP4);
1475 pg_edit_set_fixed (&p->n_l2_address_bytes, 6);
1476 pg_edit_set_fixed (&p->n_l3_address_bytes, 4);
1478 if (!unformat (input, "%U: %U/%U -> %U/%U",
1480 unformat_ethernet_arp_opcode_net_byte_order, &p->opcode,
1482 unformat_ethernet_address, &p->ip4_over_ethernet[0].ethernet,
1484 unformat_ip4_address, &p->ip4_over_ethernet[0].ip4,
1486 unformat_ethernet_address, &p->ip4_over_ethernet[1].ethernet,
1488 unformat_ip4_address, &p->ip4_over_ethernet[1].ip4))
1490 /* Free up any edits we may have added. */
1491 pg_free_edit_group (s);
1498 ip4_set_arp_limit (u32 arp_limit)
1500 ethernet_arp_main_t *am = ðernet_arp_main;
1502 am->limit_arp_cache_size = arp_limit;
1507 * @brief Control Plane hook to remove an ARP entry
1510 vnet_arp_unset_ip4_over_ethernet (vnet_main_t * vnm,
1511 u32 sw_if_index, void *a_arg)
1513 ethernet_arp_ip4_over_ethernet_address_t *a = a_arg;
1514 vnet_arp_set_ip4_over_ethernet_rpc_args_t args;
1516 args.sw_if_index = sw_if_index;
1517 args.flags = ETHERNET_ARP_ARGS_REMOVE;
1518 clib_memcpy (&args.a, a, sizeof (*a));
1520 vl_api_rpc_call_main_thread (set_ip4_over_ethernet_rpc_callback,
1521 (u8 *) & args, sizeof (args));
1526 * @brief Internally generated event to flush the ARP cache on an
1527 * interface state change event.
1528 * A flush will remove dynamic ARP entries, and for statics remove the MAC
1529 * address from the corresponding adjacencies.
1532 vnet_arp_flush_ip4_over_ethernet (vnet_main_t * vnm,
1533 u32 sw_if_index, void *a_arg)
1535 ethernet_arp_ip4_over_ethernet_address_t *a = a_arg;
1536 vnet_arp_set_ip4_over_ethernet_rpc_args_t args;
1538 args.sw_if_index = sw_if_index;
1539 args.flags = ETHERNET_ARP_ARGS_FLUSH;
1540 clib_memcpy (&args.a, a, sizeof (*a));
1542 vl_api_rpc_call_main_thread (set_ip4_over_ethernet_rpc_callback,
1543 (u8 *) & args, sizeof (args));
1548 * @brief Internally generated event to populate the ARP cache on an
1549 * interface state change event.
1550 * For static entries this will re-source the adjacencies.
1552 * @param sw_if_index The interface on which the ARP entires are acted
1555 vnet_arp_populate_ip4_over_ethernet (vnet_main_t * vnm,
1556 u32 sw_if_index, void *a_arg)
1558 ethernet_arp_ip4_over_ethernet_address_t *a = a_arg;
1559 vnet_arp_set_ip4_over_ethernet_rpc_args_t args;
1561 args.sw_if_index = sw_if_index;
1562 args.flags = ETHERNET_ARP_ARGS_POPULATE;
1563 clib_memcpy (&args.a, a, sizeof (*a));
1565 vl_api_rpc_call_main_thread (set_ip4_over_ethernet_rpc_callback,
1566 (u8 *) & args, sizeof (args));
1571 * arp_add_del_interface_address
1573 * callback when an interface address is added or deleted
1576 arp_add_del_interface_address (ip4_main_t * im,
1579 ip4_address_t * address,
1581 u32 if_address_index, u32 is_del)
1584 * Flush the ARP cache of all entries covered by the address
1585 * that is being removed.
1587 ethernet_arp_main_t *am = ðernet_arp_main;
1588 ethernet_arp_ip4_entry_t *e;
1590 if (vec_len (am->ethernet_arp_by_sw_if_index) <= sw_if_index)
1595 ethernet_arp_interface_t *eai;
1596 u32 i, *to_delete = 0;
1599 eai = &am->ethernet_arp_by_sw_if_index[sw_if_index];
1602 hash_foreach_pair (pair, eai->arp_entries,
1604 e = pool_elt_at_index(am->ip4_entry_pool,
1606 if (ip4_destination_matches_route (im, &e->ip4_address,
1607 address, address_length))
1609 vec_add1 (to_delete, e - am->ip4_entry_pool);
1614 for (i = 0; i < vec_len (to_delete); i++)
1616 ethernet_arp_ip4_over_ethernet_address_t delme;
1617 e = pool_elt_at_index (am->ip4_entry_pool, to_delete[i]);
1619 clib_memcpy (&delme.ethernet, e->ethernet_address, 6);
1620 delme.ip4.as_u32 = e->ip4_address.as_u32;
1622 vnet_arp_flush_ip4_over_ethernet (vnet_get_main (),
1623 e->sw_if_index, &delme);
1626 vec_free (to_delete);
1630 static clib_error_t *
1631 ethernet_arp_init (vlib_main_t * vm)
1633 ethernet_arp_main_t *am = ðernet_arp_main;
1634 ip4_main_t *im = &ip4_main;
1635 clib_error_t *error;
1638 if ((error = vlib_call_init_function (vm, ethernet_init)))
1641 ethernet_register_input_type (vm, ETHERNET_TYPE_ARP, arp_input_node.index);
1643 pn = pg_get_node (arp_input_node.index);
1644 pn->unformat_edit = unformat_pg_arp_header;
1646 am->opcode_by_name = hash_create_string (0, sizeof (uword));
1647 #define _(o) hash_set_mem (am->opcode_by_name, #o, ETHERNET_ARP_OPCODE_##o);
1648 foreach_ethernet_arp_opcode;
1651 /* $$$ configurable */
1652 am->limit_arp_cache_size = 50000;
1654 am->pending_resolutions_by_address = hash_create (0, sizeof (uword));
1655 am->mac_changes_by_address = hash_create (0, sizeof (uword));
1657 /* don't trace ARP error packets */
1659 vlib_node_runtime_t *rt =
1660 vlib_node_get_runtime (vm, arp_input_node.index);
1663 vnet_pcap_drop_trace_filter_add_del \
1664 (rt->errors[ETHERNET_ARP_ERROR_##a], \
1666 foreach_ethernet_arp_error
1670 ip4_add_del_interface_address_callback_t cb;
1671 cb.function = arp_add_del_interface_address;
1672 cb.function_opaque = 0;
1673 vec_add1 (im->add_del_interface_address_callbacks, cb);
1678 VLIB_INIT_FUNCTION (ethernet_arp_init);
1681 arp_entry_free (ethernet_arp_interface_t * eai, ethernet_arp_ip4_entry_t * e)
1683 ethernet_arp_main_t *am = ðernet_arp_main;
1685 /* it's safe to delete the ADJ source on the FIB entry, even if it
1687 fib_table_entry_delete_index (e->fib_entry_index, FIB_SOURCE_ADJ);
1688 hash_unset (eai->arp_entries, e->ip4_address.as_u32);
1689 pool_put (am->ip4_entry_pool, e);
1693 vnet_arp_unset_ip4_over_ethernet_internal (vnet_main_t * vnm,
1694 vnet_arp_set_ip4_over_ethernet_rpc_args_t
1697 ethernet_arp_main_t *am = ðernet_arp_main;
1698 ethernet_arp_ip4_entry_t *e;
1699 ethernet_arp_interface_t *eai;
1701 eai = &am->ethernet_arp_by_sw_if_index[args->sw_if_index];
1703 e = arp_entry_find (eai, &args->a.ip4);
1707 arp_entry_free (eai, e);
1709 adj_nbr_walk_nh4 (e->sw_if_index,
1710 &e->ip4_address, arp_mk_incomplete_walk, NULL);
1717 vnet_arp_flush_ip4_over_ethernet_internal (vnet_main_t * vnm,
1718 vnet_arp_set_ip4_over_ethernet_rpc_args_t
1721 ethernet_arp_main_t *am = ðernet_arp_main;
1722 ethernet_arp_ip4_entry_t *e;
1723 ethernet_arp_interface_t *eai;
1725 eai = &am->ethernet_arp_by_sw_if_index[args->sw_if_index];
1727 e = arp_entry_find (eai, &args->a.ip4);
1731 adj_nbr_walk_nh4 (e->sw_if_index,
1732 &e->ip4_address, arp_mk_incomplete_walk, e);
1735 * The difference between flush and unset, is that an unset
1736 * means delete for static and dynamic entries. A flush
1737 * means delete only for dynamic. Flushing is what the DP
1738 * does in response to interface events. unset is only done
1739 * by the control plane.
1741 if (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_DYNAMIC)
1743 arp_entry_free (eai, e);
1750 vnet_arp_populate_ip4_over_ethernet_internal (vnet_main_t * vnm,
1751 vnet_arp_set_ip4_over_ethernet_rpc_args_t
1754 ethernet_arp_main_t *am = ðernet_arp_main;
1755 ethernet_arp_ip4_entry_t *e;
1756 ethernet_arp_interface_t *eai;
1758 eai = &am->ethernet_arp_by_sw_if_index[args->sw_if_index];
1760 e = arp_entry_find (eai, &args->a.ip4);
1764 adj_nbr_walk_nh4 (e->sw_if_index,
1765 &e->ip4_address, arp_mk_complete_walk, e);
1771 set_ip4_over_ethernet_rpc_callback (vnet_arp_set_ip4_over_ethernet_rpc_args_t
1774 vnet_main_t *vm = vnet_get_main ();
1775 ASSERT (os_get_cpu_number () == 0);
1777 if (a->flags & ETHERNET_ARP_ARGS_REMOVE)
1778 vnet_arp_unset_ip4_over_ethernet_internal (vm, a);
1779 else if (a->flags & ETHERNET_ARP_ARGS_FLUSH)
1780 vnet_arp_flush_ip4_over_ethernet_internal (vm, a);
1781 else if (a->flags & ETHERNET_ARP_ARGS_POPULATE)
1782 vnet_arp_populate_ip4_over_ethernet_internal (vm, a);
1784 vnet_arp_set_ip4_over_ethernet_internal (vm, a);
1788 * @brief Invoked when the interface's admin state changes
1790 static clib_error_t *
1791 ethernet_arp_sw_interface_up_down (vnet_main_t * vnm,
1792 u32 sw_if_index, u32 flags)
1794 ethernet_arp_main_t *am = ðernet_arp_main;
1795 ethernet_arp_ip4_entry_t *e;
1796 u32 i, *to_delete = 0;
1799 pool_foreach (e, am->ip4_entry_pool,
1801 if (e->sw_if_index == sw_if_index)
1802 vec_add1 (to_delete,
1803 e - am->ip4_entry_pool);
1807 for (i = 0; i < vec_len (to_delete); i++)
1809 ethernet_arp_ip4_over_ethernet_address_t delme;
1810 e = pool_elt_at_index (am->ip4_entry_pool, to_delete[i]);
1812 clib_memcpy (&delme.ethernet, e->ethernet_address, 6);
1813 delme.ip4.as_u32 = e->ip4_address.as_u32;
1815 if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
1817 vnet_arp_populate_ip4_over_ethernet (vnm, e->sw_if_index, &delme);
1821 vnet_arp_flush_ip4_over_ethernet (vnm, e->sw_if_index, &delme);
1825 vec_free (to_delete);
1830 VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (ethernet_arp_sw_interface_up_down);
1833 increment_ip4_and_mac_address (ethernet_arp_ip4_over_ethernet_address_t * a)
1838 for (i = 3; i >= 0; i--)
1840 old = a->ip4.as_u8[i];
1841 a->ip4.as_u8[i] += 1;
1842 if (old < a->ip4.as_u8[i])
1846 for (i = 5; i >= 0; i--)
1848 old = a->ethernet[i];
1849 a->ethernet[i] += 1;
1850 if (old < a->ethernet[i])
1856 vnet_arp_set_ip4_over_ethernet (vnet_main_t * vnm,
1857 u32 sw_if_index, void *a_arg,
1858 int is_static, int is_no_fib_entry)
1860 ethernet_arp_ip4_over_ethernet_address_t *a = a_arg;
1861 vnet_arp_set_ip4_over_ethernet_rpc_args_t args;
1863 args.sw_if_index = sw_if_index;
1864 args.is_static = is_static;
1865 args.is_no_fib_entry = is_no_fib_entry;
1867 clib_memcpy (&args.a, a, sizeof (*a));
1869 vl_api_rpc_call_main_thread (set_ip4_over_ethernet_rpc_callback,
1870 (u8 *) & args, sizeof (args));
1875 vnet_proxy_arp_add_del (ip4_address_t * lo_addr,
1876 ip4_address_t * hi_addr, u32 fib_index, int is_del)
1878 ethernet_arp_main_t *am = ðernet_arp_main;
1879 ethernet_proxy_arp_t *pa;
1880 u32 found_at_index = ~0;
1882 vec_foreach (pa, am->proxy_arps)
1884 if (pa->lo_addr == lo_addr->as_u32
1885 && pa->hi_addr == hi_addr->as_u32 && pa->fib_index == fib_index)
1887 found_at_index = pa - am->proxy_arps;
1892 if (found_at_index != ~0)
1894 /* Delete, otherwise it's already in the table */
1896 vec_delete (am->proxy_arps, 1, found_at_index);
1899 /* delete, no such entry */
1901 return VNET_API_ERROR_NO_SUCH_ENTRY;
1903 /* add, not in table */
1904 vec_add2 (am->proxy_arps, pa, 1);
1905 pa->lo_addr = lo_addr->as_u32;
1906 pa->hi_addr = hi_addr->as_u32;
1907 pa->fib_index = fib_index;
1912 * Remove any proxy arp entries asdociated with the
1916 vnet_proxy_arp_fib_reset (u32 fib_id)
1918 ip4_main_t *im = &ip4_main;
1919 ethernet_arp_main_t *am = ðernet_arp_main;
1920 ethernet_proxy_arp_t *pa;
1921 u32 *entries_to_delete = 0;
1926 p = hash_get (im->fib_index_by_table_id, fib_id);
1928 return VNET_API_ERROR_NO_SUCH_ENTRY;
1931 vec_foreach (pa, am->proxy_arps)
1933 if (pa->fib_index == fib_index)
1935 vec_add1 (entries_to_delete, pa - am->proxy_arps);
1939 for (i = 0; i < vec_len (entries_to_delete); i++)
1941 vec_delete (am->proxy_arps, 1, entries_to_delete[i]);
1944 vec_free (entries_to_delete);
1949 static clib_error_t *
1950 ip_arp_add_del_command_fn (vlib_main_t * vm,
1951 unformat_input_t * input, vlib_cli_command_t * cmd)
1953 vnet_main_t *vnm = vnet_get_main ();
1955 ethernet_arp_ip4_over_ethernet_address_t lo_addr, hi_addr, addr;
1962 int is_no_fib_entry = 0;
1965 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
1967 /* set ip arp TenGigE1/1/0/1 1.2.3.4 aa:bb:... or aabb.ccdd... */
1968 if (unformat (input, "%U %U %U",
1969 unformat_vnet_sw_interface, vnm, &sw_if_index,
1970 unformat_ip4_address, &addr.ip4,
1971 unformat_ethernet_address, &addr.ethernet))
1974 else if (unformat (input, "delete") || unformat (input, "del"))
1977 else if (unformat (input, "static"))
1980 else if (unformat (input, "no-fib-entry"))
1981 is_no_fib_entry = 1;
1983 else if (unformat (input, "count %d", &count))
1986 else if (unformat (input, "fib-id %d", &fib_id))
1988 ip4_main_t *im = &ip4_main;
1989 uword *p = hash_get (im->fib_index_by_table_id, fib_id);
1991 return clib_error_return (0, "fib ID %d doesn't exist\n", fib_id);
1995 else if (unformat (input, "proxy %U - %U",
1996 unformat_ip4_address, &lo_addr.ip4,
1997 unformat_ip4_address, &hi_addr.ip4))
2005 (void) vnet_proxy_arp_add_del (&lo_addr.ip4, &hi_addr.ip4,
2014 for (i = 0; i < count; i++)
2018 uword event_type, *event_data = 0;
2020 /* Park the debug CLI until the arp entry is installed */
2021 vnet_register_ip4_arp_resolution_event
2022 (vnm, &addr.ip4, vlib_current_process (vm),
2023 1 /* type */ , 0 /* data */ );
2025 vnet_arp_set_ip4_over_ethernet
2026 (vnm, sw_if_index, &addr, is_static, is_no_fib_entry);
2028 vlib_process_wait_for_event (vm);
2029 event_type = vlib_process_get_events (vm, &event_data);
2030 vec_reset_length (event_data);
2031 if (event_type != 1)
2032 clib_warning ("event type %d unexpected", event_type);
2035 vnet_arp_unset_ip4_over_ethernet (vnm, sw_if_index, &addr);
2037 increment_ip4_and_mac_address (&addr);
2042 return clib_error_return (0, "unknown input `%U'",
2043 format_unformat_error, input);
2051 * Add or delete IPv4 ARP cache entries.
2053 * @note 'set ip arp' options (e.g. delete, static, 'fib-id <id>',
2054 * 'count <number>', 'interface ip4_addr mac_addr') can be added in
2055 * any order and combination.
2059 * Add or delete IPv4 ARP cache entries as follows. MAC Address can be in
2060 * either aa:bb:cc:dd:ee:ff format or aabb.ccdd.eeff format.
2061 * @cliexcmd{set ip arp GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2062 * @cliexcmd{set ip arp delete GigabitEthernet2/0/0 6.0.0.3 de:ad:be:ef:ba:be}
2064 * To add or delete an IPv4 ARP cache entry to or from a specific fib
2066 * @cliexcmd{set ip arp fib-id 1 GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2067 * @cliexcmd{set ip arp fib-id 1 delete GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2069 * Add or delete IPv4 static ARP cache entries as follows:
2070 * @cliexcmd{set ip arp static GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2071 * @cliexcmd{set ip arp static delete GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2073 * For testing / debugging purposes, the 'set ip arp' command can add or
2074 * delete multiple entries. Supply the 'count N' parameter:
2075 * @cliexcmd{set ip arp count 10 GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2078 VLIB_CLI_COMMAND (ip_arp_add_del_command, static) = {
2079 .path = "set ip arp",
2081 "set ip arp [del] <intfc> <ip-address> <mac-address> [static] [no-fib-entry] [count <count>] [fib-id <fib-id>] [proxy <lo-addr> - <hi-addr>]",
2082 .function = ip_arp_add_del_command_fn,
2086 static clib_error_t *
2087 set_int_proxy_arp_command_fn (vlib_main_t * vm,
2089 input, vlib_cli_command_t * cmd)
2091 vnet_main_t *vnm = vnet_get_main ();
2093 vnet_sw_interface_t *si;
2097 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2099 if (unformat (input, "%U", unformat_vnet_sw_interface,
2102 else if (unformat (input, "enable") || unformat (input, "on"))
2104 else if (unformat (input, "disable") || unformat (input, "off"))
2111 return clib_error_return (0, "unknown input '%U'",
2112 format_unformat_error, input);
2114 si = vnet_get_sw_interface (vnm, sw_if_index);
2117 si->flags |= VNET_SW_INTERFACE_FLAG_PROXY_ARP;
2119 si->flags &= ~VNET_SW_INTERFACE_FLAG_PROXY_ARP;
2126 * Enable proxy-arp on an interface. The vpp stack will answer ARP
2127 * requests for the indicated address range. Multiple proxy-arp
2128 * ranges may be provisioned.
2130 * @note Proxy ARP as a technology is infamous for blackholing traffic.
2131 * Also, the underlying implementation has not been performance-tuned.
2132 * Avoid creating an unnecessarily large set of ranges.
2135 * To enable proxy arp on a range of addresses, use:
2136 * @cliexcmd{set ip arp proxy 6.0.0.1 - 6.0.0.11}
2137 * Append 'del' to delete a range of proxy ARP addresses:
2138 * @cliexcmd{set ip arp proxy 6.0.0.1 - 6.0.0.11 del}
2139 * You must then specifically enable proxy arp on individual interfaces:
2140 * @cliexcmd{set interface proxy-arp GigabitEthernet0/8/0 enable}
2141 * To disable proxy arp on an individual interface:
2142 * @cliexcmd{set interface proxy-arp GigabitEthernet0/8/0 disable}
2144 VLIB_CLI_COMMAND (set_int_proxy_enable_command, static) = {
2145 .path = "set interface proxy-arp",
2147 "set interface proxy-arp <intfc> [enable|disable]",
2148 .function = set_int_proxy_arp_command_fn,
2154 * ARP/ND Termination in a L2 Bridge Domain based on IP4/IP6 to MAC
2155 * hash tables mac_by_ip4 and mac_by_ip6 for each BD.
2159 ARP_TERM_NEXT_L2_OUTPUT,
2164 u32 arp_term_next_node_index[32];
2167 arp_term_l2bd (vlib_main_t * vm,
2168 vlib_node_runtime_t * node, vlib_frame_t * frame)
2170 l2input_main_t *l2im = &l2input_main;
2171 u32 n_left_from, next_index, *from, *to_next;
2172 u32 n_replies_sent = 0;
2173 u16 last_bd_index = ~0;
2174 l2_bridge_domain_t *last_bd_config = 0;
2175 l2_input_config_t *cfg0;
2177 from = vlib_frame_vector_args (frame);
2178 n_left_from = frame->n_vectors;
2179 next_index = node->cached_next_index;
2181 while (n_left_from > 0)
2185 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2187 while (n_left_from > 0 && n_left_to_next > 0)
2190 ethernet_header_t *eth0;
2191 ethernet_arp_header_t *arp0;
2194 u32 pi0, error0, next0, sw_if_index0;
2205 n_left_to_next -= 1;
2207 p0 = vlib_get_buffer (vm, pi0);
2208 // Terminate only local (SHG == 0) ARP
2209 if (vnet_buffer (p0)->l2.shg != 0)
2210 goto next_l2_feature;
2212 eth0 = vlib_buffer_get_current (p0);
2213 l3h0 = (u8 *) eth0 + vnet_buffer (p0)->l2.l2_len;
2214 ethertype0 = clib_net_to_host_u16 (*(u16 *) (l3h0 - 2));
2215 arp0 = (ethernet_arp_header_t *) l3h0;
2217 if (PREDICT_FALSE ((ethertype0 != ETHERNET_TYPE_ARP) ||
2219 clib_host_to_net_u16
2220 (ETHERNET_ARP_OPCODE_request))))
2223 /* Must be ARP request packet here */
2224 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) &&
2225 (p0->flags & VLIB_BUFFER_IS_TRACED)))
2227 u8 *t0 = vlib_add_trace (vm, node, p0,
2228 sizeof (ethernet_arp_input_trace_t));
2229 clib_memcpy (t0, l3h0, sizeof (ethernet_arp_input_trace_t));
2232 error0 = ETHERNET_ARP_ERROR_replies_sent;
2235 clib_net_to_host_u16 (ETHERNET_ARP_HARDWARE_TYPE_ethernet)
2236 ? ETHERNET_ARP_ERROR_l2_type_not_ethernet : error0);
2239 clib_net_to_host_u16 (ETHERNET_TYPE_IP4) ?
2240 ETHERNET_ARP_ERROR_l3_type_not_ip4 : error0);
2242 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
2247 /* Trash ARP packets whose ARP-level source addresses do not
2248 match their L2-frame-level source addresses */
2251 (eth0->src_address, arp0->ip4_over_ethernet[0].ethernet,
2252 sizeof (eth0->src_address))))
2254 error0 = ETHERNET_ARP_ERROR_l2_address_mismatch;
2258 /* Check if anyone want ARP request events for L2 BDs */
2260 pending_resolution_t *mc;
2261 ethernet_arp_main_t *am = ðernet_arp_main;
2262 uword *p = hash_get (am->mac_changes_by_address, 0);
2265 u32 next_index = p[0];
2266 while (next_index != (u32) ~ 0)
2268 int (*fp) (u32, u8 *, u32, u32);
2270 mc = pool_elt_at_index (am->mac_changes, next_index);
2271 fp = mc->data_callback;
2272 /* Call the callback, return 1 to suppress dup events */
2274 rv = (*fp) (mc->data,
2275 arp0->ip4_over_ethernet[0].ethernet,
2277 arp0->ip4_over_ethernet[0].ip4.as_u32);
2278 /* Signal the resolver process */
2280 vlib_process_signal_event (vm, mc->node_index,
2281 mc->type_opaque, mc->data);
2282 next_index = mc->next_index;
2287 /* lookup BD mac_by_ip4 hash table for MAC entry */
2288 ip0 = arp0->ip4_over_ethernet[1].ip4.as_u32;
2289 bd_index0 = vnet_buffer (p0)->l2.bd_index;
2290 if (PREDICT_FALSE ((bd_index0 != last_bd_index)
2291 || (last_bd_index == (u16) ~ 0)))
2293 last_bd_index = bd_index0;
2294 last_bd_config = vec_elt_at_index (l2im->bd_configs, bd_index0);
2296 macp0 = (u8 *) hash_get (last_bd_config->mac_by_ip4, ip0);
2298 if (PREDICT_FALSE (!macp0))
2299 goto next_l2_feature; /* MAC not found */
2301 /* MAC found, send ARP reply -
2302 Convert ARP request packet to ARP reply */
2303 arp0->opcode = clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply);
2304 arp0->ip4_over_ethernet[1] = arp0->ip4_over_ethernet[0];
2305 arp0->ip4_over_ethernet[0].ip4.as_u32 = ip0;
2306 clib_memcpy (arp0->ip4_over_ethernet[0].ethernet, macp0, 6);
2307 clib_memcpy (eth0->dst_address, eth0->src_address, 6);
2308 clib_memcpy (eth0->src_address, macp0, 6);
2309 n_replies_sent += 1;
2312 /* For BVI, need to use l2-fwd node to send ARP reply as
2313 l2-output node cannot output packet to BVI properly */
2314 cfg0 = vec_elt_at_index (l2im->configs, sw_if_index0);
2315 if (PREDICT_FALSE (cfg0->bvi))
2317 vnet_buffer (p0)->l2.feature_bitmap |= L2INPUT_FEAT_FWD;
2318 vnet_buffer (p0)->sw_if_index[VLIB_RX] = 0;
2319 goto next_l2_feature;
2322 /* Send ARP/ND reply back out input interface through l2-output */
2323 vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
2324 next0 = ARP_TERM_NEXT_L2_OUTPUT;
2325 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2326 to_next, n_left_to_next, pi0,
2331 /* IP6 ND event notification or solicitation handling to generate
2332 local response instead of flooding */
2333 iph0 = (ip6_header_t *) l3h0;
2334 if (PREDICT_FALSE (ethertype0 == ETHERNET_TYPE_IP6 &&
2335 iph0->protocol == IP_PROTOCOL_ICMP6 &&
2336 !ip6_address_is_unspecified
2337 (&iph0->src_address)))
2339 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
2340 if (vnet_ip6_nd_term
2341 (vm, node, p0, eth0, iph0, sw_if_index0,
2342 vnet_buffer (p0)->l2.bd_index))
2343 goto output_response;
2348 u32 feature_bitmap0 =
2349 vnet_buffer (p0)->l2.feature_bitmap & ~L2INPUT_FEAT_ARP_TERM;
2350 vnet_buffer (p0)->l2.feature_bitmap = feature_bitmap0;
2352 feat_bitmap_get_next_node_index (arp_term_next_node_index,
2354 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2355 to_next, n_left_to_next,
2361 if (0 == arp0->ip4_over_ethernet[0].ip4.as_u32 ||
2362 (arp0->ip4_over_ethernet[0].ip4.as_u32 ==
2363 arp0->ip4_over_ethernet[1].ip4.as_u32))
2365 error0 = ETHERNET_ARP_ERROR_gratuitous_arp;
2367 next0 = ARP_TERM_NEXT_DROP;
2368 p0->error = node->errors[error0];
2370 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2371 to_next, n_left_to_next, pi0,
2375 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2378 vlib_error_count (vm, node->node_index,
2379 ETHERNET_ARP_ERROR_replies_sent, n_replies_sent);
2380 return frame->n_vectors;
2384 VLIB_REGISTER_NODE (arp_term_l2bd_node, static) = {
2385 .function = arp_term_l2bd,
2386 .name = "arp-term-l2bd",
2387 .vector_size = sizeof (u32),
2388 .n_errors = ETHERNET_ARP_N_ERROR,
2389 .error_strings = ethernet_arp_error_strings,
2390 .n_next_nodes = ARP_TERM_N_NEXT,
2392 [ARP_TERM_NEXT_L2_OUTPUT] = "l2-output",
2393 [ARP_TERM_NEXT_DROP] = "error-drop",
2395 .format_buffer = format_ethernet_arp_header,
2396 .format_trace = format_arp_term_input_trace,
2401 arp_term_init (vlib_main_t * vm)
2403 // Initialize the feature next-node indexes
2404 feat_bitmap_init_next_nodes (vm,
2405 arp_term_l2bd_node.index,
2407 l2input_get_feat_names (),
2408 arp_term_next_node_index);
2412 VLIB_INIT_FUNCTION (arp_term_init);
2415 change_arp_mac (u32 sw_if_index, ethernet_arp_ip4_entry_t * e)
2417 if (e->sw_if_index == sw_if_index)
2419 adj_nbr_walk_nh4 (e->sw_if_index,
2420 &e->ip4_address, arp_mk_complete_walk, e);
2425 ethernet_arp_change_mac (u32 sw_if_index)
2427 ethernet_arp_main_t *am = ðernet_arp_main;
2428 ethernet_arp_ip4_entry_t *e;
2431 pool_foreach (e, am->ip4_entry_pool,
2433 change_arp_mac (sw_if_index, e);
2439 * fd.io coding-style-patch-verification: ON
2442 * eval: (c-set-style "gnu")