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_GLEAN:
459 adj_glean_update_rewrite (ai);
461 case IP_LOOKUP_NEXT_ARP:
464 adj_nbr_walk_nh4 (sw_if_index,
465 &e->ip4_address, arp_mk_complete_walk, e);
470 * no matching ARP entry.
471 * construct the rewrite required to for an ARP packet, and stick
472 * that in the adj's pipe to smoke.
474 adj_nbr_update_rewrite
476 ADJ_NBR_REWRITE_FLAG_INCOMPLETE,
477 ethernet_build_rewrite
481 VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST));
484 * since the FIB has added this adj for a route, it makes sense it
485 * may want to forward traffic sometime soon. Let's send a
486 * speculative ARP. just one. If we were to do periodically that
487 * wouldn't be bad either, but that's more code than i'm prepared to
488 * write at this time for relatively little reward.
493 case IP_LOOKUP_NEXT_MCAST:
496 * Construct a partial rewrite from the known ethernet mcast dest MAC
501 rewrite = ethernet_build_rewrite (vnm,
504 ethernet_ip4_mcast_dst_addr ());
505 offset = vec_len (rewrite) - 2;
508 * Complete the remaining fields of the adj's rewrite to direct the
509 * complete of the rewrite at switch time by copying in the IP
510 * dst address's bytes.
511 * Ofset is 2 bytes into the MAC desintation address.
513 adj_mcast_update_rewrite (ai, rewrite, offset);
517 case IP_LOOKUP_NEXT_DROP:
518 case IP_LOOKUP_NEXT_PUNT:
519 case IP_LOOKUP_NEXT_LOCAL:
520 case IP_LOOKUP_NEXT_REWRITE:
521 case IP_LOOKUP_NEXT_MCAST_MIDCHAIN:
522 case IP_LOOKUP_NEXT_MIDCHAIN:
523 case IP_LOOKUP_NEXT_ICMP_ERROR:
524 case IP_LOOKUP_N_NEXT:
531 arp_adj_fib_add (ethernet_arp_ip4_entry_t * e, u32 fib_index)
535 .fp_proto = FIB_PROTOCOL_IP4,
536 .fp_addr.ip4 = e->ip4_address,
540 fib_table_entry_path_add (fib_index, &pfx, FIB_SOURCE_ADJ,
541 FIB_ENTRY_FLAG_ATTACHED,
542 DPO_PROTO_IP4, &pfx.fp_addr,
543 e->sw_if_index, ~0, 1, NULL,
544 FIB_ROUTE_PATH_FLAG_NONE);
545 fib_table_lock (fib_index, FIB_PROTOCOL_IP4, FIB_SOURCE_ADJ);
549 vnet_arp_set_ip4_over_ethernet_internal (vnet_main_t * vnm,
550 vnet_arp_set_ip4_over_ethernet_rpc_args_t
553 ethernet_arp_ip4_entry_t *e = 0;
554 ethernet_arp_main_t *am = ðernet_arp_main;
555 ethernet_arp_ip4_over_ethernet_address_t *a = &args->a;
556 vlib_main_t *vm = vlib_get_main ();
557 int make_new_arp_cache_entry = 1;
559 pending_resolution_t *pr, *mc;
560 ethernet_arp_interface_t *arp_int;
561 int is_static = args->is_static;
562 u32 sw_if_index = args->sw_if_index;
563 int is_no_fib_entry = args->is_no_fib_entry;
565 vec_validate (am->ethernet_arp_by_sw_if_index, sw_if_index);
567 arp_int = &am->ethernet_arp_by_sw_if_index[sw_if_index];
569 if (NULL != arp_int->arp_entries)
571 p = hash_get (arp_int->arp_entries, a->ip4.as_u32);
574 e = pool_elt_at_index (am->ip4_entry_pool, p[0]);
576 /* Refuse to over-write static arp. */
577 if (!is_static && (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC))
579 make_new_arp_cache_entry = 0;
583 if (make_new_arp_cache_entry)
585 pool_get (am->ip4_entry_pool, e);
587 if (NULL == arp_int->arp_entries)
589 arp_int->arp_entries = hash_create (0, sizeof (u32));
592 hash_set (arp_int->arp_entries, a->ip4.as_u32, e - am->ip4_entry_pool);
594 e->sw_if_index = sw_if_index;
595 e->ip4_address = a->ip4;
596 e->fib_entry_index = FIB_NODE_INDEX_INVALID;
597 clib_memcpy (e->ethernet_address,
598 a->ethernet, sizeof (e->ethernet_address));
600 if (!is_no_fib_entry)
603 ip4_fib_table_get_index_for_sw_if_index
608 e->flags |= ETHERNET_ARP_IP4_ENTRY_FLAG_NO_FIB_ENTRY;
614 * prevent a DoS attack from the data-plane that
615 * spams us with no-op updates to the MAC address
617 if (0 == memcmp (e->ethernet_address,
618 a->ethernet, sizeof (e->ethernet_address)))
619 goto check_customers;
621 /* Update time stamp and ethernet address. */
622 clib_memcpy (e->ethernet_address, a->ethernet,
623 sizeof (e->ethernet_address));
626 e->cpu_time_last_updated = clib_cpu_time_now ();
628 e->flags |= ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC;
630 e->flags |= ETHERNET_ARP_IP4_ENTRY_FLAG_DYNAMIC;
632 adj_nbr_walk_nh4 (sw_if_index, &e->ip4_address, arp_mk_complete_walk, e);
635 /* Customer(s) waiting for this address to be resolved? */
636 p = hash_get (am->pending_resolutions_by_address, a->ip4.as_u32);
642 while (next_index != (u32) ~ 0)
644 pr = pool_elt_at_index (am->pending_resolutions, next_index);
645 vlib_process_signal_event (vm, pr->node_index,
646 pr->type_opaque, pr->data);
647 next_index = pr->next_index;
648 pool_put (am->pending_resolutions, pr);
651 hash_unset (am->pending_resolutions_by_address, a->ip4.as_u32);
654 /* Customer(s) requesting ARP event for this address? */
655 p = hash_get (am->mac_changes_by_address, a->ip4.as_u32);
661 while (next_index != (u32) ~ 0)
663 int (*fp) (u32, u8 *, u32, u32);
665 mc = pool_elt_at_index (am->mac_changes, next_index);
666 fp = mc->data_callback;
668 /* Call the user's data callback, return 1 to suppress dup events */
670 rv = (*fp) (mc->data, a->ethernet, sw_if_index, 0);
673 * Signal the resolver process, as long as the user
674 * says they want to be notified
677 vlib_process_signal_event (vm, mc->node_index,
678 mc->type_opaque, mc->data);
679 next_index = mc->next_index;
687 vnet_register_ip4_arp_resolution_event (vnet_main_t * vnm,
690 uword type_opaque, uword data)
692 ethernet_arp_main_t *am = ðernet_arp_main;
693 ip4_address_t *address = address_arg;
695 pending_resolution_t *pr;
697 pool_get (am->pending_resolutions, pr);
700 pr->node_index = node_index;
701 pr->type_opaque = type_opaque;
703 pr->data_callback = 0;
705 p = hash_get (am->pending_resolutions_by_address, address->as_u32);
708 /* Insert new resolution at the head of the list */
709 pr->next_index = p[0];
710 hash_unset (am->pending_resolutions_by_address, address->as_u32);
713 hash_set (am->pending_resolutions_by_address, address->as_u32,
714 pr - am->pending_resolutions);
718 vnet_add_del_ip4_arp_change_event (vnet_main_t * vnm,
723 uword type_opaque, uword data, int is_add)
725 ethernet_arp_main_t *am = ðernet_arp_main;
726 ip4_address_t *address = address_arg;
728 /* Try to find an existing entry */
729 u32 *first = (u32 *) hash_get (am->mac_changes_by_address, address->as_u32);
731 pending_resolution_t *mc;
732 while (p && *p != ~0)
734 mc = pool_elt_at_index (am->mac_changes, *p);
735 if (mc->node_index == node_index && mc->type_opaque == type_opaque
741 int found = p && *p != ~0;
745 return VNET_API_ERROR_ENTRY_ALREADY_EXISTS;
747 pool_get (am->mac_changes, mc);
748 *mc = (pending_resolution_t)
750 .next_index = ~0,.node_index = node_index,.type_opaque =
751 type_opaque,.data = data,.data_callback = data_callback,.pid =
754 /* Insert new resolution at the end of the list */
755 u32 new_idx = mc - am->mac_changes;
759 hash_set (am->mac_changes_by_address, address->as_u32, new_idx);
764 return VNET_API_ERROR_NO_SUCH_ENTRY;
766 /* Clients may need to clean up pool entries, too */
767 void (*fp) (u32, u8 *) = data_callback;
769 (*fp) (mc->data, 0 /* no new mac addrs */ );
771 /* Remove the entry from the list and delete the entry */
773 pool_put (am->mac_changes, mc);
775 /* Remove from hash if we deleted the last entry */
776 if (*p == ~0 && p == first)
777 hash_unset (am->mac_changes_by_address, address->as_u32);
782 /* Either we drop the packet or we send a reply to the sender. */
786 ARP_INPUT_NEXT_REPLY_TX,
790 #define foreach_ethernet_arp_error \
791 _ (replies_sent, "ARP replies sent") \
792 _ (l2_type_not_ethernet, "L2 type not ethernet") \
793 _ (l3_type_not_ip4, "L3 type not IP4") \
794 _ (l3_src_address_not_local, "IP4 source address not local to subnet") \
795 _ (l3_dst_address_not_local, "IP4 destination address not local to subnet") \
796 _ (l3_src_address_is_local, "IP4 source address matches local interface") \
797 _ (l3_src_address_learned, "ARP request IP4 source address learned") \
798 _ (replies_received, "ARP replies received") \
799 _ (opcode_not_request, "ARP opcode not request") \
800 _ (proxy_arp_replies_sent, "Proxy ARP replies sent") \
801 _ (l2_address_mismatch, "ARP hw addr does not match L2 frame src addr") \
802 _ (gratuitous_arp, "ARP probe or announcement dropped") \
803 _ (interface_no_table, "Interface is not mapped to an IP table") \
804 _ (interface_not_ip_enabled, "Interface is not IP enabled") \
808 #define _(sym,string) ETHERNET_ARP_ERROR_##sym,
809 foreach_ethernet_arp_error
811 ETHERNET_ARP_N_ERROR,
812 } ethernet_arp_input_error_t;
816 unset_random_arp_entry (void)
818 ethernet_arp_main_t *am = ðernet_arp_main;
819 ethernet_arp_ip4_entry_t *e;
820 vnet_main_t *vnm = vnet_get_main ();
821 ethernet_arp_ip4_over_ethernet_address_t delme;
824 index = pool_next_index (am->ip4_entry_pool, am->arp_delete_rotor);
825 am->arp_delete_rotor = index;
827 /* Try again from elt 0, could happen if an intfc goes down */
830 index = pool_next_index (am->ip4_entry_pool, am->arp_delete_rotor);
831 am->arp_delete_rotor = index;
834 /* Nothing left in the pool */
838 e = pool_elt_at_index (am->ip4_entry_pool, index);
840 clib_memcpy (&delme.ethernet, e->ethernet_address, 6);
841 delme.ip4.as_u32 = e->ip4_address.as_u32;
843 vnet_arp_unset_ip4_over_ethernet (vnm, e->sw_if_index, &delme);
847 arp_unnumbered (vlib_buffer_t * p0,
848 u32 input_sw_if_index, u32 conn_sw_if_index)
850 vnet_main_t *vnm = vnet_get_main ();
851 vnet_interface_main_t *vim = &vnm->interface_main;
852 vnet_sw_interface_t *si;
854 /* verify that the input interface is unnumbered to the connected.
855 * the connected interface is the interface on which the subnet is
857 si = &vim->sw_interfaces[input_sw_if_index];
859 if (!(si->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED &&
860 (si->unnumbered_sw_if_index == conn_sw_if_index)))
862 /* the input interface is not unnumbered to the interface on which
863 * the sub-net is configured that covers the ARP request.
864 * So this is not the case for unnumbered.. */
872 arp_learn (vnet_main_t * vnm,
873 ethernet_arp_main_t * am, u32 sw_if_index, void *addr)
875 if (am->limit_arp_cache_size &&
876 pool_elts (am->ip4_entry_pool) >= am->limit_arp_cache_size)
877 unset_random_arp_entry ();
879 vnet_arp_set_ip4_over_ethernet (vnm, sw_if_index, addr, 0, 0);
880 return (ETHERNET_ARP_ERROR_l3_src_address_learned);
884 arp_input (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
886 ethernet_arp_main_t *am = ðernet_arp_main;
887 vnet_main_t *vnm = vnet_get_main ();
888 ip4_main_t *im4 = &ip4_main;
889 u32 n_left_from, next_index, *from, *to_next;
890 u32 n_replies_sent = 0, n_proxy_arp_replies_sent = 0;
892 from = vlib_frame_vector_args (frame);
893 n_left_from = frame->n_vectors;
894 next_index = node->cached_next_index;
896 if (node->flags & VLIB_NODE_FLAG_TRACE)
897 vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
899 sizeof (ethernet_arp_input_trace_t));
901 while (n_left_from > 0)
905 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
907 while (n_left_from > 0 && n_left_to_next > 0)
910 vnet_hw_interface_t *hw_if0;
911 ethernet_arp_header_t *arp0;
912 ethernet_header_t *eth_rx, *eth_tx;
913 ip4_address_t *if_addr0, proxy_src;
914 u32 pi0, error0, next0, sw_if_index0, conn_sw_if_index0, fib_index0;
915 u8 is_request0, dst_is_local0, is_unnum0, is_vrrp_reply0;
916 ethernet_proxy_arp_t *pa;
917 fib_node_index_t dst_fei, src_fei;
919 fib_entry_flag_t src_flags, dst_flags;
920 u8 *rewrite0, rewrite0_len;
930 p0 = vlib_get_buffer (vm, pi0);
931 arp0 = vlib_buffer_get_current (p0);
932 /* Fill in ethernet header. */
933 eth_rx = ethernet_buffer_get_header (p0);
935 is_request0 = arp0->opcode
936 == clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_request);
938 error0 = ETHERNET_ARP_ERROR_replies_sent;
942 clib_net_to_host_u16 (ETHERNET_ARP_HARDWARE_TYPE_ethernet) ?
943 ETHERNET_ARP_ERROR_l2_type_not_ethernet : error0);
946 clib_net_to_host_u16 (ETHERNET_TYPE_IP4) ?
947 ETHERNET_ARP_ERROR_l3_type_not_ip4 : error0);
949 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
951 /* not playing the ARP game if the interface is not IPv4 enabled */
953 (im4->ip_enabled_by_sw_if_index[sw_if_index0] == 0 ?
954 ETHERNET_ARP_ERROR_interface_not_ip_enabled : error0);
959 /* Check that IP address is local and matches incoming interface. */
960 fib_index0 = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);
961 if (~0 == fib_index0)
963 error0 = ETHERNET_ARP_ERROR_interface_no_table;
967 dst_fei = ip4_fib_table_lookup (ip4_fib_get (fib_index0),
968 &arp0->ip4_over_ethernet[1].ip4,
970 dst_flags = fib_entry_get_flags (dst_fei);
972 conn_sw_if_index0 = fib_entry_get_resolving_interface (dst_fei);
974 /* Honor unnumbered interface, if any */
975 is_unnum0 = sw_if_index0 != conn_sw_if_index0;
979 * we're looking for FIB entries that indicate the source
980 * is attached. There may be more specific non-attached
981 * routes that match the source, but these do not influence
982 * whether we respond to an ARP request, i.e. they do not
983 * influence whether we are the correct way for the sender
984 * to reach us, they only affect how we reach the sender.
986 fib_entry_t *src_fib_entry;
987 fib_entry_src_t *src;
998 src_fei = ip4_fib_table_lookup (ip4_fib_get (fib_index0),
1000 ip4_over_ethernet[0].ip4,
1002 src_fib_entry = fib_entry_get (src_fei);
1005 * It's possible that the source that provides the
1006 * flags we need, or the flags we must not have,
1007 * is not the best source, so check then all.
1010 FOR_EACH_SRC_ADDED(src_fib_entry, src, source,
1012 src_flags = fib_entry_get_flags_for_source (src_fei, source);
1014 /* Reject requests/replies with our local interface
1016 if (FIB_ENTRY_FLAG_LOCAL & src_flags)
1018 error0 = ETHERNET_ARP_ERROR_l3_src_address_is_local;
1020 * When VPP has an interface whose address is also
1021 * applied to a TAP interface on the host, then VPP's
1022 * TAP interface will be unnumbered to the 'real'
1023 * interface and do proxy ARP from the host.
1024 * The curious aspect of this setup is that ARP requests
1025 * from the host will come from the VPP's own address.
1026 * So don't drop immediately here, instead go see if this
1027 * is a proxy ARP case.
1031 /* A Source must also be local to subnet of matching
1032 * interface address. */
1033 if ((FIB_ENTRY_FLAG_ATTACHED & src_flags) ||
1034 (FIB_ENTRY_FLAG_CONNECTED & src_flags))
1041 * The packet was sent from an address that is not
1042 * connected nor attached i.e. it is not from an
1043 * address that is covered by a link's sub-net,
1044 * nor is it a already learned host resp.
1050 * shorter mask lookup for the next iteration.
1052 fib_entry_get_prefix (src_fei, &pfx);
1053 mask = pfx.fp_len - 1;
1056 * continue until we hit the default route or we find
1057 * the attached we are looking for. The most likely
1058 * outcome is we find the attached with the first source
1059 * on the first lookup.
1063 !fib_entry_is_sourced (src_fei, FIB_SOURCE_DEFAULT_ROUTE));
1068 * the matching route is a not attached, i.e. it was
1069 * added as a result of routing, rather than interface/ARP
1070 * configuration. If the matching route is not a host route
1073 error0 = ETHERNET_ARP_ERROR_l3_src_address_not_local;
1078 if (!(FIB_ENTRY_FLAG_CONNECTED & dst_flags))
1080 error0 = ETHERNET_ARP_ERROR_l3_dst_address_not_local;
1084 if (sw_if_index0 != fib_entry_get_resolving_interface (src_fei))
1087 * The interface the ARP was received on is not the interface
1088 * on which the covering prefix is configured. Maybe this is a
1089 * case for unnumbered.
1094 dst_is_local0 = (FIB_ENTRY_FLAG_LOCAL & dst_flags);
1095 fib_entry_get_prefix (dst_fei, &pfx0);
1096 if_addr0 = &pfx0.fp_addr.ip4;
1100 clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply))
1103 (arp0->ip4_over_ethernet[0].ethernet, vrrp_prefix,
1104 sizeof (vrrp_prefix))));
1106 /* Trash ARP packets whose ARP-level source addresses do not
1107 match their L2-frame-level source addresses, unless it's
1108 a reply from a VRRP virtual router */
1110 (eth_rx->src_address, arp0->ip4_over_ethernet[0].ethernet,
1111 sizeof (eth_rx->src_address)) && !is_vrrp_reply0)
1113 error0 = ETHERNET_ARP_ERROR_l2_address_mismatch;
1117 /* Learn or update sender's mapping only for replies to addresses
1118 * that are local to the subnet */
1120 clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply) &&
1123 error0 = arp_learn (vnm, am, sw_if_index0,
1124 &arp0->ip4_over_ethernet[0]);
1127 else if (arp0->opcode ==
1128 clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_request) &&
1129 (dst_is_local0 == 0))
1136 An adjacency to the sender is not always present,
1137 so we use the interface to build us a rewrite string
1138 which will contain all the necessary tags. */
1139 rewrite0 = ethernet_build_rewrite (vnm, sw_if_index0,
1141 eth_rx->src_address);
1142 rewrite0_len = vec_len (rewrite0);
1144 /* Figure out how much to rewind current data from adjacency. */
1145 vlib_buffer_advance (p0, -rewrite0_len);
1146 eth_tx = vlib_buffer_get_current (p0);
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 /* the rx nd tx ethernet headers wil overlap in the case
1168 * when we received a tagged VLAN=0 packet, but we are sending
1170 clib_memcpy (eth_tx, rewrite0, vec_len (rewrite0));
1171 vec_free (rewrite0);
1177 if (!arp_unnumbered (p0, sw_if_index0, conn_sw_if_index0))
1182 /* We are going to reply to this request, so, in the absence of
1183 errors, learn the sender */
1185 error0 = arp_learn (vnm, am, sw_if_index0,
1186 &arp0->ip4_over_ethernet[1]);
1188 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1189 n_left_to_next, pi0, next0);
1191 n_replies_sent += 1;
1195 if (0 == arp0->ip4_over_ethernet[0].ip4.as_u32 ||
1196 (arp0->ip4_over_ethernet[0].ip4.as_u32 ==
1197 arp0->ip4_over_ethernet[1].ip4.as_u32))
1199 error0 = ETHERNET_ARP_ERROR_gratuitous_arp;
1202 /* See if proxy arp is configured for the address */
1205 vnet_sw_interface_t *si;
1206 u32 this_addr = clib_net_to_host_u32
1207 (arp0->ip4_over_ethernet[1].ip4.as_u32);
1210 si = vnet_get_sw_interface (vnm, sw_if_index0);
1212 if (!(si->flags & VNET_SW_INTERFACE_FLAG_PROXY_ARP))
1215 fib_index0 = vec_elt (im4->fib_index_by_sw_if_index,
1218 vec_foreach (pa, am->proxy_arps)
1220 u32 lo_addr = clib_net_to_host_u32 (pa->lo_addr);
1221 u32 hi_addr = clib_net_to_host_u32 (pa->hi_addr);
1223 /* an ARP request hit in the proxy-arp table? */
1224 if ((this_addr >= lo_addr && this_addr <= hi_addr) &&
1225 (fib_index0 == pa->fib_index))
1228 arp0->ip4_over_ethernet[1].ip4.data_u32;
1231 * change the interface address to the proxied
1233 if_addr0 = &proxy_src;
1235 n_proxy_arp_replies_sent++;
1243 next0 = ARP_INPUT_NEXT_DROP;
1244 p0->error = node->errors[error0];
1246 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1247 n_left_to_next, pi0, next0);
1250 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1253 vlib_error_count (vm, node->node_index,
1254 ETHERNET_ARP_ERROR_replies_sent,
1255 n_replies_sent - n_proxy_arp_replies_sent);
1257 vlib_error_count (vm, node->node_index,
1258 ETHERNET_ARP_ERROR_proxy_arp_replies_sent,
1259 n_proxy_arp_replies_sent);
1260 return frame->n_vectors;
1263 static char *ethernet_arp_error_strings[] = {
1264 #define _(sym,string) string,
1265 foreach_ethernet_arp_error
1270 VLIB_REGISTER_NODE (arp_input_node, static) =
1272 .function = arp_input,
1273 .name = "arp-input",
1274 .vector_size = sizeof (u32),
1275 .n_errors = ETHERNET_ARP_N_ERROR,
1276 .error_strings = ethernet_arp_error_strings,
1277 .n_next_nodes = ARP_INPUT_N_NEXT,
1279 [ARP_INPUT_NEXT_DROP] = "error-drop",
1280 [ARP_INPUT_NEXT_REPLY_TX] = "interface-output",
1282 .format_buffer = format_ethernet_arp_header,
1283 .format_trace = format_ethernet_arp_input_trace,
1288 ip4_arp_entry_sort (void *a1, void *a2)
1290 ethernet_arp_ip4_entry_t *e1 = a1;
1291 ethernet_arp_ip4_entry_t *e2 = a2;
1294 vnet_main_t *vnm = vnet_get_main ();
1296 cmp = vnet_sw_interface_compare (vnm, e1->sw_if_index, e2->sw_if_index);
1298 cmp = ip4_address_compare (&e1->ip4_address, &e2->ip4_address);
1302 ethernet_arp_ip4_entry_t *
1303 ip4_neighbor_entries (u32 sw_if_index)
1305 ethernet_arp_main_t *am = ðernet_arp_main;
1306 ethernet_arp_ip4_entry_t *n, *ns = 0;
1309 pool_foreach (n, am->ip4_entry_pool, ({
1310 if (sw_if_index != ~0 && n->sw_if_index != sw_if_index)
1312 vec_add1 (ns, n[0]);
1317 vec_sort_with_function (ns, ip4_arp_entry_sort);
1321 static clib_error_t *
1322 show_ip4_arp (vlib_main_t * vm,
1323 unformat_input_t * input, vlib_cli_command_t * cmd)
1325 vnet_main_t *vnm = vnet_get_main ();
1326 ethernet_arp_main_t *am = ðernet_arp_main;
1327 ethernet_arp_ip4_entry_t *e, *es;
1328 ethernet_proxy_arp_t *pa;
1329 clib_error_t *error = 0;
1332 /* Filter entries by interface if given. */
1334 (void) unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index);
1336 es = ip4_neighbor_entries (sw_if_index);
1339 vlib_cli_output (vm, "%U", format_ethernet_arp_ip4_entry, vnm, 0);
1342 vlib_cli_output (vm, "%U", format_ethernet_arp_ip4_entry, vnm, e);
1347 if (vec_len (am->proxy_arps))
1349 vlib_cli_output (vm, "Proxy arps enabled for:");
1350 vec_foreach (pa, am->proxy_arps)
1352 vlib_cli_output (vm, "Fib_index %d %U - %U ",
1354 format_ip4_address, &pa->lo_addr,
1355 format_ip4_address, &pa->hi_addr);
1363 * Display all the IPv4 ARP entries.
1366 * Example of how to display the IPv4 ARP table:
1367 * @cliexstart{show ip arp}
1368 * Time FIB IP4 Flags Ethernet Interface
1369 * 346.3028 0 6.1.1.3 de:ad:be:ef:ba:be GigabitEthernet2/0/0
1370 * 3077.4271 0 6.1.1.4 S de:ad:be:ef:ff:ff GigabitEthernet2/0/0
1371 * 2998.6409 1 6.2.2.3 de:ad:be:ef:00:01 GigabitEthernet2/0/0
1372 * Proxy arps enabled for:
1373 * Fib_index 0 6.0.0.1 - 6.0.0.11
1377 VLIB_CLI_COMMAND (show_ip4_arp_command, static) = {
1378 .path = "show ip arp",
1379 .function = show_ip4_arp,
1380 .short_help = "show ip arp",
1386 pg_edit_t l2_type, l3_type;
1387 pg_edit_t n_l2_address_bytes, n_l3_address_bytes;
1393 } ip4_over_ethernet[2];
1394 } pg_ethernet_arp_header_t;
1397 pg_ethernet_arp_header_init (pg_ethernet_arp_header_t * p)
1399 /* Initialize fields that are not bit fields in the IP header. */
1400 #define _(f) pg_edit_init (&p->f, ethernet_arp_header_t, f);
1403 _(n_l2_address_bytes);
1404 _(n_l3_address_bytes);
1406 _(ip4_over_ethernet[0].ethernet);
1407 _(ip4_over_ethernet[0].ip4);
1408 _(ip4_over_ethernet[1].ethernet);
1409 _(ip4_over_ethernet[1].ip4);
1414 unformat_pg_arp_header (unformat_input_t * input, va_list * args)
1416 pg_stream_t *s = va_arg (*args, pg_stream_t *);
1417 pg_ethernet_arp_header_t *p;
1420 p = pg_create_edit_group (s, sizeof (p[0]), sizeof (ethernet_arp_header_t),
1422 pg_ethernet_arp_header_init (p);
1425 pg_edit_set_fixed (&p->l2_type, ETHERNET_ARP_HARDWARE_TYPE_ethernet);
1426 pg_edit_set_fixed (&p->l3_type, ETHERNET_TYPE_IP4);
1427 pg_edit_set_fixed (&p->n_l2_address_bytes, 6);
1428 pg_edit_set_fixed (&p->n_l3_address_bytes, 4);
1430 if (!unformat (input, "%U: %U/%U -> %U/%U",
1432 unformat_ethernet_arp_opcode_net_byte_order, &p->opcode,
1434 unformat_ethernet_address, &p->ip4_over_ethernet[0].ethernet,
1436 unformat_ip4_address, &p->ip4_over_ethernet[0].ip4,
1438 unformat_ethernet_address, &p->ip4_over_ethernet[1].ethernet,
1440 unformat_ip4_address, &p->ip4_over_ethernet[1].ip4))
1442 /* Free up any edits we may have added. */
1443 pg_free_edit_group (s);
1450 ip4_set_arp_limit (u32 arp_limit)
1452 ethernet_arp_main_t *am = ðernet_arp_main;
1454 am->limit_arp_cache_size = arp_limit;
1459 * @brief Control Plane hook to remove an ARP entry
1462 vnet_arp_unset_ip4_over_ethernet (vnet_main_t * vnm,
1463 u32 sw_if_index, void *a_arg)
1465 ethernet_arp_ip4_over_ethernet_address_t *a = a_arg;
1466 vnet_arp_set_ip4_over_ethernet_rpc_args_t args;
1468 args.sw_if_index = sw_if_index;
1469 args.flags = ETHERNET_ARP_ARGS_REMOVE;
1470 clib_memcpy (&args.a, a, sizeof (*a));
1472 vl_api_rpc_call_main_thread (set_ip4_over_ethernet_rpc_callback,
1473 (u8 *) & args, sizeof (args));
1478 * @brief Internally generated event to flush the ARP cache on an
1479 * interface state change event.
1480 * A flush will remove dynamic ARP entries, and for statics remove the MAC
1481 * address from the corresponding adjacencies.
1484 vnet_arp_flush_ip4_over_ethernet (vnet_main_t * vnm,
1485 u32 sw_if_index, void *a_arg)
1487 ethernet_arp_ip4_over_ethernet_address_t *a = a_arg;
1488 vnet_arp_set_ip4_over_ethernet_rpc_args_t args;
1490 args.sw_if_index = sw_if_index;
1491 args.flags = ETHERNET_ARP_ARGS_FLUSH;
1492 clib_memcpy (&args.a, a, sizeof (*a));
1494 vl_api_rpc_call_main_thread (set_ip4_over_ethernet_rpc_callback,
1495 (u8 *) & args, sizeof (args));
1500 * @brief Internally generated event to populate the ARP cache on an
1501 * interface state change event.
1502 * For static entries this will re-source the adjacencies.
1504 * @param sw_if_index The interface on which the ARP entires are acted
1507 vnet_arp_populate_ip4_over_ethernet (vnet_main_t * vnm,
1508 u32 sw_if_index, void *a_arg)
1510 ethernet_arp_ip4_over_ethernet_address_t *a = a_arg;
1511 vnet_arp_set_ip4_over_ethernet_rpc_args_t args;
1513 args.sw_if_index = sw_if_index;
1514 args.flags = ETHERNET_ARP_ARGS_POPULATE;
1515 clib_memcpy (&args.a, a, sizeof (*a));
1517 vl_api_rpc_call_main_thread (set_ip4_over_ethernet_rpc_callback,
1518 (u8 *) & args, sizeof (args));
1523 * @brief publish wildcard arp event
1524 * @param sw_if_index The interface on which the ARP entires are acted
1527 vnet_arp_wc_publish (u32 sw_if_index, void *a_arg)
1529 ethernet_arp_ip4_over_ethernet_address_t *a = a_arg;
1530 vnet_arp_set_ip4_over_ethernet_rpc_args_t args = {
1531 .flags = ETHERNET_ARP_ARGS_WC_PUB,
1532 .sw_if_index = sw_if_index,
1536 vl_api_rpc_call_main_thread (set_ip4_over_ethernet_rpc_callback,
1537 (u8 *) & args, sizeof (args));
1542 vnet_arp_wc_publish_internal (vnet_main_t * vnm,
1543 vnet_arp_set_ip4_over_ethernet_rpc_args_t *
1546 vlib_main_t *vm = vlib_get_main ();
1547 ethernet_arp_main_t *am = ðernet_arp_main;
1548 uword ni = am->wc_ip4_arp_publisher_node;
1549 uword et = am->wc_ip4_arp_publisher_et;
1551 if (ni == (uword) ~ 0)
1553 wc_arp_report_t *r =
1554 vlib_process_signal_event_data (vm, ni, et, 1, sizeof *r);
1555 r->ip4 = args->a.ip4.as_u32;
1556 r->sw_if_index = args->sw_if_index;
1557 memcpy (r->mac, args->a.ethernet, sizeof r->mac);
1561 wc_arp_set_publisher_node (uword node_index, uword event_type)
1563 ethernet_arp_main_t *am = ðernet_arp_main;
1564 am->wc_ip4_arp_publisher_node = node_index;
1565 am->wc_ip4_arp_publisher_et = event_type;
1569 * arp_add_del_interface_address
1571 * callback when an interface address is added or deleted
1574 arp_add_del_interface_address (ip4_main_t * im,
1577 ip4_address_t * address,
1579 u32 if_address_index, u32 is_del)
1582 * Flush the ARP cache of all entries covered by the address
1583 * that is being removed.
1585 ethernet_arp_main_t *am = ðernet_arp_main;
1586 ethernet_arp_ip4_entry_t *e;
1588 if (vec_len (am->ethernet_arp_by_sw_if_index) <= sw_if_index)
1593 ethernet_arp_interface_t *eai;
1594 u32 i, *to_delete = 0;
1597 eai = &am->ethernet_arp_by_sw_if_index[sw_if_index];
1600 hash_foreach_pair (pair, eai->arp_entries,
1602 e = pool_elt_at_index(am->ip4_entry_pool,
1604 if (ip4_destination_matches_route (im, &e->ip4_address,
1605 address, address_length))
1607 vec_add1 (to_delete, e - am->ip4_entry_pool);
1612 for (i = 0; i < vec_len (to_delete); i++)
1614 ethernet_arp_ip4_over_ethernet_address_t delme;
1615 e = pool_elt_at_index (am->ip4_entry_pool, to_delete[i]);
1617 clib_memcpy (&delme.ethernet, e->ethernet_address, 6);
1618 delme.ip4.as_u32 = e->ip4_address.as_u32;
1620 vnet_arp_flush_ip4_over_ethernet (vnet_get_main (),
1621 e->sw_if_index, &delme);
1624 vec_free (to_delete);
1629 arp_adj_fib_remove (ethernet_arp_ip4_entry_t * e, u32 fib_index)
1631 if (FIB_NODE_INDEX_INVALID != e->fib_entry_index)
1633 fib_prefix_t pfx = {
1635 .fp_proto = FIB_PROTOCOL_IP4,
1636 .fp_addr.ip4 = e->ip4_address,
1640 fib_index = ip4_fib_table_get_index_for_sw_if_index (e->sw_if_index);
1642 fib_table_entry_path_remove (fib_index, &pfx,
1646 e->sw_if_index, ~0, 1,
1647 FIB_ROUTE_PATH_FLAG_NONE);
1648 fib_table_unlock (fib_index, FIB_PROTOCOL_IP4, FIB_SOURCE_ADJ);
1653 arp_table_bind (ip4_main_t * im,
1655 u32 sw_if_index, u32 new_fib_index, u32 old_fib_index)
1657 ethernet_arp_main_t *am = ðernet_arp_main;
1658 ethernet_arp_interface_t *eai;
1659 ethernet_arp_ip4_entry_t *e;
1663 * the IP table that the interface is bound to has changed.
1664 * reinstall all the adj fibs.
1667 if (vec_len (am->ethernet_arp_by_sw_if_index) <= sw_if_index)
1670 eai = &am->ethernet_arp_by_sw_if_index[sw_if_index];
1673 hash_foreach_pair (pair, eai->arp_entries,
1675 e = pool_elt_at_index(am->ip4_entry_pool,
1678 * remove the adj-fib from the old table and add to the new
1680 arp_adj_fib_remove(e, old_fib_index);
1681 arp_adj_fib_add(e, new_fib_index);
1687 static clib_error_t *
1688 ethernet_arp_init (vlib_main_t * vm)
1690 ethernet_arp_main_t *am = ðernet_arp_main;
1691 ip4_main_t *im = &ip4_main;
1692 clib_error_t *error;
1695 if ((error = vlib_call_init_function (vm, ethernet_init)))
1698 ethernet_register_input_type (vm, ETHERNET_TYPE_ARP, arp_input_node.index);
1700 pn = pg_get_node (arp_input_node.index);
1701 pn->unformat_edit = unformat_pg_arp_header;
1703 am->opcode_by_name = hash_create_string (0, sizeof (uword));
1704 #define _(o) hash_set_mem (am->opcode_by_name, #o, ETHERNET_ARP_OPCODE_##o);
1705 foreach_ethernet_arp_opcode;
1708 /* $$$ configurable */
1709 am->limit_arp_cache_size = 50000;
1711 am->pending_resolutions_by_address = hash_create (0, sizeof (uword));
1712 am->mac_changes_by_address = hash_create (0, sizeof (uword));
1713 am->wc_ip4_arp_publisher_node = (uword) ~ 0;
1715 /* don't trace ARP error packets */
1717 vlib_node_runtime_t *rt =
1718 vlib_node_get_runtime (vm, arp_input_node.index);
1721 vnet_pcap_drop_trace_filter_add_del \
1722 (rt->errors[ETHERNET_ARP_ERROR_##a], \
1724 foreach_ethernet_arp_error
1728 ip4_add_del_interface_address_callback_t cb;
1729 cb.function = arp_add_del_interface_address;
1730 cb.function_opaque = 0;
1731 vec_add1 (im->add_del_interface_address_callbacks, cb);
1733 ip4_table_bind_callback_t cbt;
1734 cbt.function = arp_table_bind;
1735 cbt.function_opaque = 0;
1736 vec_add1 (im->table_bind_callbacks, cbt);
1741 VLIB_INIT_FUNCTION (ethernet_arp_init);
1744 arp_entry_free (ethernet_arp_interface_t * eai, ethernet_arp_ip4_entry_t * e)
1746 ethernet_arp_main_t *am = ðernet_arp_main;
1748 arp_adj_fib_remove (e,
1749 ip4_fib_table_get_index_for_sw_if_index
1751 hash_unset (eai->arp_entries, e->ip4_address.as_u32);
1752 pool_put (am->ip4_entry_pool, e);
1756 vnet_arp_unset_ip4_over_ethernet_internal (vnet_main_t * vnm,
1757 vnet_arp_set_ip4_over_ethernet_rpc_args_t
1760 ethernet_arp_main_t *am = ðernet_arp_main;
1761 ethernet_arp_ip4_entry_t *e;
1762 ethernet_arp_interface_t *eai;
1764 if (vec_len (am->ethernet_arp_by_sw_if_index) <= args->sw_if_index)
1767 eai = &am->ethernet_arp_by_sw_if_index[args->sw_if_index];
1769 e = arp_entry_find (eai, &args->a.ip4);
1773 arp_entry_free (eai, e);
1775 adj_nbr_walk_nh4 (e->sw_if_index,
1776 &e->ip4_address, arp_mk_incomplete_walk, NULL);
1783 vnet_arp_flush_ip4_over_ethernet_internal (vnet_main_t * vnm,
1784 vnet_arp_set_ip4_over_ethernet_rpc_args_t
1787 ethernet_arp_main_t *am = ðernet_arp_main;
1788 ethernet_arp_ip4_entry_t *e;
1789 ethernet_arp_interface_t *eai;
1791 if (vec_len (am->ethernet_arp_by_sw_if_index) <= args->sw_if_index)
1794 eai = &am->ethernet_arp_by_sw_if_index[args->sw_if_index];
1796 e = arp_entry_find (eai, &args->a.ip4);
1800 adj_nbr_walk_nh4 (e->sw_if_index,
1801 &e->ip4_address, arp_mk_incomplete_walk, e);
1804 * The difference between flush and unset, is that an unset
1805 * means delete for static and dynamic entries. A flush
1806 * means delete only for dynamic. Flushing is what the DP
1807 * does in response to interface events. unset is only done
1808 * by the control plane.
1810 if (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC)
1812 e->flags &= ETHERNET_ARP_IP4_ENTRY_FLAG_DYNAMIC;
1814 else if (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_DYNAMIC)
1816 arp_entry_free (eai, e);
1823 vnet_arp_populate_ip4_over_ethernet_internal (vnet_main_t * vnm,
1824 vnet_arp_set_ip4_over_ethernet_rpc_args_t
1827 ethernet_arp_main_t *am = ðernet_arp_main;
1828 ethernet_arp_ip4_entry_t *e;
1829 ethernet_arp_interface_t *eai;
1831 vec_validate (am->ethernet_arp_by_sw_if_index, args->sw_if_index);
1832 eai = &am->ethernet_arp_by_sw_if_index[args->sw_if_index];
1834 e = arp_entry_find (eai, &args->a.ip4);
1838 adj_nbr_walk_nh4 (e->sw_if_index,
1839 &e->ip4_address, arp_mk_complete_walk, e);
1845 set_ip4_over_ethernet_rpc_callback (vnet_arp_set_ip4_over_ethernet_rpc_args_t
1848 vnet_main_t *vm = vnet_get_main ();
1849 ASSERT (vlib_get_thread_index () == 0);
1851 if (a->flags & ETHERNET_ARP_ARGS_REMOVE)
1852 vnet_arp_unset_ip4_over_ethernet_internal (vm, a);
1853 else if (a->flags & ETHERNET_ARP_ARGS_FLUSH)
1854 vnet_arp_flush_ip4_over_ethernet_internal (vm, a);
1855 else if (a->flags & ETHERNET_ARP_ARGS_POPULATE)
1856 vnet_arp_populate_ip4_over_ethernet_internal (vm, a);
1857 else if (a->flags & ETHERNET_ARP_ARGS_WC_PUB)
1858 vnet_arp_wc_publish_internal (vm, a);
1860 vnet_arp_set_ip4_over_ethernet_internal (vm, a);
1864 * @brief Invoked when the interface's admin state changes
1866 static clib_error_t *
1867 ethernet_arp_sw_interface_up_down (vnet_main_t * vnm,
1868 u32 sw_if_index, u32 flags)
1870 ethernet_arp_main_t *am = ðernet_arp_main;
1871 ethernet_arp_ip4_entry_t *e;
1872 u32 i, *to_delete = 0;
1875 pool_foreach (e, am->ip4_entry_pool,
1877 if (e->sw_if_index == sw_if_index)
1878 vec_add1 (to_delete,
1879 e - am->ip4_entry_pool);
1883 for (i = 0; i < vec_len (to_delete); i++)
1885 ethernet_arp_ip4_over_ethernet_address_t delme;
1886 e = pool_elt_at_index (am->ip4_entry_pool, to_delete[i]);
1888 clib_memcpy (&delme.ethernet, e->ethernet_address, 6);
1889 delme.ip4.as_u32 = e->ip4_address.as_u32;
1891 if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
1893 vnet_arp_populate_ip4_over_ethernet (vnm, e->sw_if_index, &delme);
1897 vnet_arp_flush_ip4_over_ethernet (vnm, e->sw_if_index, &delme);
1901 vec_free (to_delete);
1906 VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (ethernet_arp_sw_interface_up_down);
1909 increment_ip4_and_mac_address (ethernet_arp_ip4_over_ethernet_address_t * a)
1914 for (i = 3; i >= 0; i--)
1916 old = a->ip4.as_u8[i];
1917 a->ip4.as_u8[i] += 1;
1918 if (old < a->ip4.as_u8[i])
1922 for (i = 5; i >= 0; i--)
1924 old = a->ethernet[i];
1925 a->ethernet[i] += 1;
1926 if (old < a->ethernet[i])
1932 vnet_arp_set_ip4_over_ethernet (vnet_main_t * vnm,
1933 u32 sw_if_index, void *a_arg,
1934 int is_static, int is_no_fib_entry)
1936 ethernet_arp_ip4_over_ethernet_address_t *a = a_arg;
1937 vnet_arp_set_ip4_over_ethernet_rpc_args_t args;
1939 args.sw_if_index = sw_if_index;
1940 args.is_static = is_static;
1941 args.is_no_fib_entry = is_no_fib_entry;
1943 clib_memcpy (&args.a, a, sizeof (*a));
1945 vl_api_rpc_call_main_thread (set_ip4_over_ethernet_rpc_callback,
1946 (u8 *) & args, sizeof (args));
1951 vnet_proxy_arp_add_del (ip4_address_t * lo_addr,
1952 ip4_address_t * hi_addr, u32 fib_index, int is_del)
1954 ethernet_arp_main_t *am = ðernet_arp_main;
1955 ethernet_proxy_arp_t *pa;
1956 u32 found_at_index = ~0;
1958 vec_foreach (pa, am->proxy_arps)
1960 if (pa->lo_addr == lo_addr->as_u32
1961 && pa->hi_addr == hi_addr->as_u32 && pa->fib_index == fib_index)
1963 found_at_index = pa - am->proxy_arps;
1968 if (found_at_index != ~0)
1970 /* Delete, otherwise it's already in the table */
1972 vec_delete (am->proxy_arps, 1, found_at_index);
1975 /* delete, no such entry */
1977 return VNET_API_ERROR_NO_SUCH_ENTRY;
1979 /* add, not in table */
1980 vec_add2 (am->proxy_arps, pa, 1);
1981 pa->lo_addr = lo_addr->as_u32;
1982 pa->hi_addr = hi_addr->as_u32;
1983 pa->fib_index = fib_index;
1988 * Remove any proxy arp entries asdociated with the
1992 vnet_proxy_arp_fib_reset (u32 fib_id)
1994 ethernet_arp_main_t *am = ðernet_arp_main;
1995 ethernet_proxy_arp_t *pa;
1996 u32 *entries_to_delete = 0;
2000 fib_index = fib_table_find (FIB_PROTOCOL_IP4, fib_id);
2001 if (~0 == fib_index)
2002 return VNET_API_ERROR_NO_SUCH_ENTRY;
2004 vec_foreach (pa, am->proxy_arps)
2006 if (pa->fib_index == fib_index)
2008 vec_add1 (entries_to_delete, pa - am->proxy_arps);
2012 for (i = 0; i < vec_len (entries_to_delete); i++)
2014 vec_delete (am->proxy_arps, 1, entries_to_delete[i]);
2017 vec_free (entries_to_delete);
2022 static clib_error_t *
2023 ip_arp_add_del_command_fn (vlib_main_t * vm,
2024 unformat_input_t * input, vlib_cli_command_t * cmd)
2026 vnet_main_t *vnm = vnet_get_main ();
2028 ethernet_arp_ip4_over_ethernet_address_t lo_addr, hi_addr, addr;
2035 int is_no_fib_entry = 0;
2038 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2040 /* set ip arp TenGigE1/1/0/1 1.2.3.4 aa:bb:... or aabb.ccdd... */
2041 if (unformat (input, "%U %U %U",
2042 unformat_vnet_sw_interface, vnm, &sw_if_index,
2043 unformat_ip4_address, &addr.ip4,
2044 unformat_ethernet_address, &addr.ethernet))
2047 else if (unformat (input, "delete") || unformat (input, "del"))
2050 else if (unformat (input, "static"))
2053 else if (unformat (input, "no-fib-entry"))
2054 is_no_fib_entry = 1;
2056 else if (unformat (input, "count %d", &count))
2059 else if (unformat (input, "fib-id %d", &fib_id))
2061 fib_index = fib_table_find (FIB_PROTOCOL_IP4, fib_id);
2063 if (~0 == fib_index)
2064 return clib_error_return (0, "fib ID %d doesn't exist\n", fib_id);
2067 else if (unformat (input, "proxy %U - %U",
2068 unformat_ip4_address, &lo_addr.ip4,
2069 unformat_ip4_address, &hi_addr.ip4))
2077 (void) vnet_proxy_arp_add_del (&lo_addr.ip4, &hi_addr.ip4,
2086 for (i = 0; i < count; i++)
2090 uword event_type, *event_data = 0;
2092 /* Park the debug CLI until the arp entry is installed */
2093 vnet_register_ip4_arp_resolution_event
2094 (vnm, &addr.ip4, vlib_current_process (vm),
2095 1 /* type */ , 0 /* data */ );
2097 vnet_arp_set_ip4_over_ethernet
2098 (vnm, sw_if_index, &addr, is_static, is_no_fib_entry);
2100 vlib_process_wait_for_event (vm);
2101 event_type = vlib_process_get_events (vm, &event_data);
2102 vec_reset_length (event_data);
2103 if (event_type != 1)
2104 clib_warning ("event type %d unexpected", event_type);
2107 vnet_arp_unset_ip4_over_ethernet (vnm, sw_if_index, &addr);
2109 increment_ip4_and_mac_address (&addr);
2114 return clib_error_return (0, "unknown input `%U'",
2115 format_unformat_error, input);
2123 * Add or delete IPv4 ARP cache entries.
2125 * @note 'set ip arp' options (e.g. delete, static, 'fib-id <id>',
2126 * 'count <number>', 'interface ip4_addr mac_addr') can be added in
2127 * any order and combination.
2131 * Add or delete IPv4 ARP cache entries as follows. MAC Address can be in
2132 * either aa:bb:cc:dd:ee:ff format or aabb.ccdd.eeff format.
2133 * @cliexcmd{set ip arp GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2134 * @cliexcmd{set ip arp delete GigabitEthernet2/0/0 6.0.0.3 de:ad:be:ef:ba:be}
2136 * To add or delete an IPv4 ARP cache entry to or from a specific fib
2138 * @cliexcmd{set ip arp fib-id 1 GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2139 * @cliexcmd{set ip arp fib-id 1 delete GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2141 * Add or delete IPv4 static ARP cache entries as follows:
2142 * @cliexcmd{set ip arp static GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2143 * @cliexcmd{set ip arp static delete GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2145 * For testing / debugging purposes, the 'set ip arp' command can add or
2146 * delete multiple entries. Supply the 'count N' parameter:
2147 * @cliexcmd{set ip arp count 10 GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2150 VLIB_CLI_COMMAND (ip_arp_add_del_command, static) = {
2151 .path = "set ip arp",
2153 "set ip arp [del] <intfc> <ip-address> <mac-address> [static] [no-fib-entry] [count <count>] [fib-id <fib-id>] [proxy <lo-addr> - <hi-addr>]",
2154 .function = ip_arp_add_del_command_fn,
2158 static clib_error_t *
2159 set_int_proxy_arp_command_fn (vlib_main_t * vm,
2161 input, vlib_cli_command_t * cmd)
2163 vnet_main_t *vnm = vnet_get_main ();
2165 vnet_sw_interface_t *si;
2169 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2171 if (unformat (input, "%U", unformat_vnet_sw_interface,
2174 else if (unformat (input, "enable") || unformat (input, "on"))
2176 else if (unformat (input, "disable") || unformat (input, "off"))
2183 return clib_error_return (0, "unknown input '%U'",
2184 format_unformat_error, input);
2186 si = vnet_get_sw_interface (vnm, sw_if_index);
2189 si->flags |= VNET_SW_INTERFACE_FLAG_PROXY_ARP;
2191 si->flags &= ~VNET_SW_INTERFACE_FLAG_PROXY_ARP;
2198 * Enable proxy-arp on an interface. The vpp stack will answer ARP
2199 * requests for the indicated address range. Multiple proxy-arp
2200 * ranges may be provisioned.
2202 * @note Proxy ARP as a technology is infamous for blackholing traffic.
2203 * Also, the underlying implementation has not been performance-tuned.
2204 * Avoid creating an unnecessarily large set of ranges.
2207 * To enable proxy arp on a range of addresses, use:
2208 * @cliexcmd{set ip arp proxy 6.0.0.1 - 6.0.0.11}
2209 * Append 'del' to delete a range of proxy ARP addresses:
2210 * @cliexcmd{set ip arp proxy 6.0.0.1 - 6.0.0.11 del}
2211 * You must then specifically enable proxy arp on individual interfaces:
2212 * @cliexcmd{set interface proxy-arp GigabitEthernet0/8/0 enable}
2213 * To disable proxy arp on an individual interface:
2214 * @cliexcmd{set interface proxy-arp GigabitEthernet0/8/0 disable}
2216 VLIB_CLI_COMMAND (set_int_proxy_enable_command, static) = {
2217 .path = "set interface proxy-arp",
2219 "set interface proxy-arp <intfc> [enable|disable]",
2220 .function = set_int_proxy_arp_command_fn,
2226 * ARP/ND Termination in a L2 Bridge Domain based on IP4/IP6 to MAC
2227 * hash tables mac_by_ip4 and mac_by_ip6 for each BD.
2231 ARP_TERM_NEXT_L2_OUTPUT,
2236 u32 arp_term_next_node_index[32];
2239 arp_term_l2bd (vlib_main_t * vm,
2240 vlib_node_runtime_t * node, vlib_frame_t * frame)
2242 l2input_main_t *l2im = &l2input_main;
2243 u32 n_left_from, next_index, *from, *to_next;
2244 u32 n_replies_sent = 0;
2245 u16 last_bd_index = ~0;
2246 l2_bridge_domain_t *last_bd_config = 0;
2247 l2_input_config_t *cfg0;
2249 from = vlib_frame_vector_args (frame);
2250 n_left_from = frame->n_vectors;
2251 next_index = node->cached_next_index;
2253 while (n_left_from > 0)
2257 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2259 while (n_left_from > 0 && n_left_to_next > 0)
2262 ethernet_header_t *eth0;
2263 ethernet_arp_header_t *arp0;
2266 u32 pi0, error0, next0, sw_if_index0;
2278 n_left_to_next -= 1;
2280 p0 = vlib_get_buffer (vm, pi0);
2281 // Terminate only local (SHG == 0) ARP
2282 if (vnet_buffer (p0)->l2.shg != 0)
2283 goto next_l2_feature;
2285 eth0 = vlib_buffer_get_current (p0);
2286 l3h0 = (u8 *) eth0 + vnet_buffer (p0)->l2.l2_len;
2287 ethertype0 = clib_net_to_host_u16 (*(u16 *) (l3h0 - 2));
2288 arp0 = (ethernet_arp_header_t *) l3h0;
2290 if (PREDICT_FALSE ((ethertype0 != ETHERNET_TYPE_ARP) ||
2292 clib_host_to_net_u16
2293 (ETHERNET_ARP_OPCODE_request))))
2296 /* Must be ARP request packet here */
2297 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) &&
2298 (p0->flags & VLIB_BUFFER_IS_TRACED)))
2300 u8 *t0 = vlib_add_trace (vm, node, p0,
2301 sizeof (ethernet_arp_input_trace_t));
2302 clib_memcpy (t0, l3h0, sizeof (ethernet_arp_input_trace_t));
2305 error0 = ETHERNET_ARP_ERROR_replies_sent;
2308 clib_net_to_host_u16 (ETHERNET_ARP_HARDWARE_TYPE_ethernet)
2309 ? ETHERNET_ARP_ERROR_l2_type_not_ethernet : error0);
2312 clib_net_to_host_u16 (ETHERNET_TYPE_IP4) ?
2313 ETHERNET_ARP_ERROR_l3_type_not_ip4 : error0);
2315 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
2322 clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply))
2325 (arp0->ip4_over_ethernet[0].ethernet, vrrp_prefix,
2326 sizeof (vrrp_prefix))));
2328 /* Trash ARP packets whose ARP-level source addresses do not
2329 match their L2-frame-level source addresses, unless it's
2330 a reply from a VRRP virtual router */
2332 (memcmp (eth0->src_address, arp0->ip4_over_ethernet[0].ethernet,
2333 sizeof (eth0->src_address)) && !is_vrrp_reply0))
2335 error0 = ETHERNET_ARP_ERROR_l2_address_mismatch;
2339 /* Check if anyone want ARP request events for L2 BDs */
2341 ethernet_arp_main_t *am = ðernet_arp_main;
2342 if (am->wc_ip4_arp_publisher_node != (uword) ~ 0)
2343 vnet_arp_wc_publish (sw_if_index0, &arp0->ip4_over_ethernet[0]);
2346 /* lookup BD mac_by_ip4 hash table for MAC entry */
2347 ip0 = arp0->ip4_over_ethernet[1].ip4.as_u32;
2348 bd_index0 = vnet_buffer (p0)->l2.bd_index;
2349 if (PREDICT_FALSE ((bd_index0 != last_bd_index)
2350 || (last_bd_index == (u16) ~ 0)))
2352 last_bd_index = bd_index0;
2353 last_bd_config = vec_elt_at_index (l2im->bd_configs, bd_index0);
2355 macp0 = (u8 *) hash_get (last_bd_config->mac_by_ip4, ip0);
2357 if (PREDICT_FALSE (!macp0))
2358 goto next_l2_feature; /* MAC not found */
2360 /* MAC found, send ARP reply -
2361 Convert ARP request packet to ARP reply */
2362 arp0->opcode = clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply);
2363 arp0->ip4_over_ethernet[1] = arp0->ip4_over_ethernet[0];
2364 arp0->ip4_over_ethernet[0].ip4.as_u32 = ip0;
2365 clib_memcpy (arp0->ip4_over_ethernet[0].ethernet, macp0, 6);
2366 clib_memcpy (eth0->dst_address, eth0->src_address, 6);
2367 clib_memcpy (eth0->src_address, macp0, 6);
2368 n_replies_sent += 1;
2371 /* For BVI, need to use l2-fwd node to send ARP reply as
2372 l2-output node cannot output packet to BVI properly */
2373 cfg0 = vec_elt_at_index (l2im->configs, sw_if_index0);
2374 if (PREDICT_FALSE (cfg0->bvi))
2376 vnet_buffer (p0)->l2.feature_bitmap |= L2INPUT_FEAT_FWD;
2377 vnet_buffer (p0)->sw_if_index[VLIB_RX] = 0;
2378 goto next_l2_feature;
2381 /* Send ARP/ND reply back out input interface through l2-output */
2382 vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
2383 next0 = ARP_TERM_NEXT_L2_OUTPUT;
2384 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2385 to_next, n_left_to_next, pi0,
2390 /* IP6 ND event notification or solicitation handling to generate
2391 local response instead of flooding */
2392 iph0 = (ip6_header_t *) l3h0;
2393 if (PREDICT_FALSE (ethertype0 == ETHERNET_TYPE_IP6 &&
2394 iph0->protocol == IP_PROTOCOL_ICMP6 &&
2395 !ip6_address_is_unspecified
2396 (&iph0->src_address)))
2398 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
2399 if (vnet_ip6_nd_term
2400 (vm, node, p0, eth0, iph0, sw_if_index0,
2401 vnet_buffer (p0)->l2.bd_index))
2402 goto output_response;
2407 next0 = vnet_l2_feature_next (p0, arp_term_next_node_index,
2408 L2INPUT_FEAT_ARP_TERM);
2409 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2410 to_next, n_left_to_next,
2416 if (0 == arp0->ip4_over_ethernet[0].ip4.as_u32 ||
2417 (arp0->ip4_over_ethernet[0].ip4.as_u32 ==
2418 arp0->ip4_over_ethernet[1].ip4.as_u32))
2420 error0 = ETHERNET_ARP_ERROR_gratuitous_arp;
2422 next0 = ARP_TERM_NEXT_DROP;
2423 p0->error = node->errors[error0];
2425 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2426 to_next, n_left_to_next, pi0,
2430 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2433 vlib_error_count (vm, node->node_index,
2434 ETHERNET_ARP_ERROR_replies_sent, n_replies_sent);
2435 return frame->n_vectors;
2439 VLIB_REGISTER_NODE (arp_term_l2bd_node, static) = {
2440 .function = arp_term_l2bd,
2441 .name = "arp-term-l2bd",
2442 .vector_size = sizeof (u32),
2443 .n_errors = ETHERNET_ARP_N_ERROR,
2444 .error_strings = ethernet_arp_error_strings,
2445 .n_next_nodes = ARP_TERM_N_NEXT,
2447 [ARP_TERM_NEXT_L2_OUTPUT] = "l2-output",
2448 [ARP_TERM_NEXT_DROP] = "error-drop",
2450 .format_buffer = format_ethernet_arp_header,
2451 .format_trace = format_arp_term_input_trace,
2456 arp_term_init (vlib_main_t * vm)
2458 // Initialize the feature next-node indexes
2459 feat_bitmap_init_next_nodes (vm,
2460 arp_term_l2bd_node.index,
2462 l2input_get_feat_names (),
2463 arp_term_next_node_index);
2467 VLIB_INIT_FUNCTION (arp_term_init);
2470 change_arp_mac (u32 sw_if_index, ethernet_arp_ip4_entry_t * e)
2472 if (e->sw_if_index == sw_if_index)
2474 adj_nbr_walk_nh4 (e->sw_if_index,
2475 &e->ip4_address, arp_mk_complete_walk, e);
2480 ethernet_arp_change_mac (u32 sw_if_index)
2482 ethernet_arp_main_t *am = ðernet_arp_main;
2483 ethernet_arp_ip4_entry_t *e;
2487 pool_foreach (e, am->ip4_entry_pool,
2489 change_arp_mac (sw_if_index, e);
2493 ai = adj_glean_get (FIB_PROTOCOL_IP4, sw_if_index);
2495 if (ADJ_INDEX_INVALID != ai)
2496 adj_glean_update_rewrite (ai);
2500 send_ip4_garp (vlib_main_t * vm, const vnet_hw_interface_t * hi)
2502 ip4_main_t *i4m = &ip4_main;
2503 ip4_address_t *ip4_addr =
2504 ip4_interface_first_address (i4m, hi->sw_if_index, 0);
2506 send_ip4_garp_w_addr (vm, ip4_addr, hi);
2510 send_ip4_garp_w_addr (vlib_main_t * vm,
2511 const ip4_address_t * ip4_addr,
2512 const vnet_hw_interface_t * hi)
2514 ip4_main_t *i4m = &ip4_main;
2515 u32 sw_if_index = hi->sw_if_index;
2519 clib_warning ("Sending GARP for IP4 address %U on sw_if_idex %d",
2520 format_ip4_address, ip4_addr, sw_if_index);
2522 /* Form GARP packet for output - Gratuitous ARP is an ARP request packet
2523 where the interface IP/MAC pair is used for both source and request
2524 MAC/IP pairs in the request */
2526 ethernet_arp_header_t *h = vlib_packet_template_get_packet
2527 (vm, &i4m->ip4_arp_request_packet_template, &bi);
2528 clib_memcpy (h->ip4_over_ethernet[0].ethernet, hi->hw_address,
2529 sizeof (h->ip4_over_ethernet[0].ethernet));
2530 clib_memcpy (h->ip4_over_ethernet[1].ethernet, hi->hw_address,
2531 sizeof (h->ip4_over_ethernet[1].ethernet));
2532 h->ip4_over_ethernet[0].ip4 = ip4_addr[0];
2533 h->ip4_over_ethernet[1].ip4 = ip4_addr[0];
2535 /* Setup MAC header with ARP Etype and broadcast DMAC */
2536 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
2537 vlib_buffer_advance (b, -sizeof (ethernet_header_t));
2538 ethernet_header_t *e = vlib_buffer_get_current (b);
2539 e->type = clib_host_to_net_u16 (ETHERNET_TYPE_ARP);
2540 clib_memcpy (e->src_address, hi->hw_address, sizeof (e->src_address));
2541 memset (e->dst_address, 0xff, sizeof (e->dst_address));
2543 /* Send GARP packet out the specified interface */
2544 vnet_buffer (b)->sw_if_index[VLIB_RX] =
2545 vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index;
2546 vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index);
2547 u32 *to_next = vlib_frame_vector_args (f);
2550 vlib_put_frame_to_node (vm, hi->output_node_index, f);
2555 * fd.io coding-style-patch-verification: ON
2558 * eval: (c-set-style "gnu")