2 * ethernet/arp.c: IP v4 ARP node
4 * Copyright (c) 2010 Cisco and/or its affiliates.
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at:
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
18 #include <vnet/ip/ip.h>
19 #include <vnet/ip/ip6.h>
20 #include <vnet/ethernet/ethernet.h>
21 #include <vnet/ethernet/arp_packet.h>
22 #include <vnet/l2/l2_input.h>
23 #include <vppinfra/mhash.h>
24 #include <vnet/fib/ip4_fib.h>
25 #include <vnet/fib/fib_entry_src.h>
26 #include <vnet/adj/adj_nbr.h>
27 #include <vnet/adj/adj_mcast.h>
28 #include <vnet/mpls/mpls.h>
34 * This file contains code to manage the IPv4 ARP tables (IP Address
35 * to MAC Address lookup).
39 void vl_api_rpc_call_main_thread (void *fp, u8 * data, u32 data_length);
42 * @brief Per-interface ARP configuration and state
44 typedef struct ethernet_arp_interface_t_
47 * Hash table of ARP entries.
48 * Since this hash table is per-interface, the key is only the IPv4 address.
51 } ethernet_arp_interface_t;
58 } ethernet_proxy_arp_t;
66 /* Used for arp event notification only */
69 } pending_resolution_t;
73 /* Hash tables mapping name to opcode. */
74 uword *opcode_by_name;
76 /* lite beer "glean" adjacency handling */
77 uword *pending_resolutions_by_address;
78 pending_resolution_t *pending_resolutions;
80 /* Mac address change notification */
81 uword *mac_changes_by_address;
82 pending_resolution_t *mac_changes;
84 ethernet_arp_ip4_entry_t *ip4_entry_pool;
86 /* ARP attack mitigation */
88 u32 limit_arp_cache_size;
90 /** Per interface state */
91 ethernet_arp_interface_t *ethernet_arp_by_sw_if_index;
93 /* Proxy arp vector */
94 ethernet_proxy_arp_t *proxy_arps;
96 uword wc_ip4_arp_publisher_node;
97 uword wc_ip4_arp_publisher_et;
98 } ethernet_arp_main_t;
100 static ethernet_arp_main_t ethernet_arp_main;
105 ethernet_arp_ip4_over_ethernet_address_t a;
109 #define ETHERNET_ARP_ARGS_REMOVE (1<<0)
110 #define ETHERNET_ARP_ARGS_FLUSH (1<<1)
111 #define ETHERNET_ARP_ARGS_POPULATE (1<<2)
112 #define ETHERNET_ARP_ARGS_WC_PUB (1<<3)
113 } vnet_arp_set_ip4_over_ethernet_rpc_args_t;
115 static const u8 vrrp_prefix[] = { 0x00, 0x00, 0x5E, 0x00, 0x01 };
117 /* Node index for send_garp_na_process */
118 u32 send_garp_na_process_node_index;
121 set_ip4_over_ethernet_rpc_callback (vnet_arp_set_ip4_over_ethernet_rpc_args_t
125 format_ethernet_arp_hardware_type (u8 * s, va_list * va)
127 ethernet_arp_hardware_type_t h = va_arg (*va, ethernet_arp_hardware_type_t);
131 #define _(n,f) case n: t = #f; break;
132 foreach_ethernet_arp_hardware_type;
136 return format (s, "unknown 0x%x", h);
139 return format (s, "%s", t);
143 format_ethernet_arp_opcode (u8 * s, va_list * va)
145 ethernet_arp_opcode_t o = va_arg (*va, ethernet_arp_opcode_t);
149 #define _(f) case ETHERNET_ARP_OPCODE_##f: t = #f; break;
150 foreach_ethernet_arp_opcode;
154 return format (s, "unknown 0x%x", o);
157 return format (s, "%s", t);
161 unformat_ethernet_arp_opcode_host_byte_order (unformat_input_t * input,
164 int *result = va_arg (*args, int *);
165 ethernet_arp_main_t *am = ðernet_arp_main;
168 /* Numeric opcode. */
169 if (unformat (input, "0x%x", &x) || unformat (input, "%d", &x))
178 if (unformat_user (input, unformat_vlib_number_by_name,
179 am->opcode_by_name, &i))
189 unformat_ethernet_arp_opcode_net_byte_order (unformat_input_t * input,
192 int *result = va_arg (*args, int *);
194 (input, unformat_ethernet_arp_opcode_host_byte_order, result))
197 *result = clib_host_to_net_u16 ((u16) * result);
202 format_ethernet_arp_header (u8 * s, va_list * va)
204 ethernet_arp_header_t *a = va_arg (*va, ethernet_arp_header_t *);
205 u32 max_header_bytes = va_arg (*va, u32);
207 u16 l2_type, l3_type;
209 if (max_header_bytes != 0 && sizeof (a[0]) > max_header_bytes)
210 return format (s, "ARP header truncated");
212 l2_type = clib_net_to_host_u16 (a->l2_type);
213 l3_type = clib_net_to_host_u16 (a->l3_type);
215 indent = format_get_indent (s);
217 s = format (s, "%U, type %U/%U, address size %d/%d",
218 format_ethernet_arp_opcode, clib_net_to_host_u16 (a->opcode),
219 format_ethernet_arp_hardware_type, l2_type,
220 format_ethernet_type, l3_type,
221 a->n_l2_address_bytes, a->n_l3_address_bytes);
223 if (l2_type == ETHERNET_ARP_HARDWARE_TYPE_ethernet
224 && l3_type == ETHERNET_TYPE_IP4)
226 s = format (s, "\n%U%U/%U -> %U/%U",
227 format_white_space, indent,
228 format_ethernet_address, a->ip4_over_ethernet[0].ethernet,
229 format_ip4_address, &a->ip4_over_ethernet[0].ip4,
230 format_ethernet_address, a->ip4_over_ethernet[1].ethernet,
231 format_ip4_address, &a->ip4_over_ethernet[1].ip4);
235 uword n2 = a->n_l2_address_bytes;
236 uword n3 = a->n_l3_address_bytes;
237 s = format (s, "\n%U%U/%U -> %U/%U",
238 format_white_space, indent,
239 format_hex_bytes, a->data + 0 * n2 + 0 * n3, n2,
240 format_hex_bytes, a->data + 1 * n2 + 0 * n3, n3,
241 format_hex_bytes, a->data + 1 * n2 + 1 * n3, n2,
242 format_hex_bytes, a->data + 2 * n2 + 1 * n3, n3);
249 format_ethernet_arp_ip4_entry (u8 * s, va_list * va)
251 vnet_main_t *vnm = va_arg (*va, vnet_main_t *);
252 ethernet_arp_ip4_entry_t *e = va_arg (*va, ethernet_arp_ip4_entry_t *);
253 vnet_sw_interface_t *si;
257 return format (s, "%=12s%=16s%=6s%=20s%=24s", "Time", "IP4",
258 "Flags", "Ethernet", "Interface");
260 si = vnet_get_sw_interface (vnm, e->sw_if_index);
262 if (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC)
263 flags = format (flags, "S");
265 if (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_DYNAMIC)
266 flags = format (flags, "D");
268 if (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_NO_FIB_ENTRY)
269 flags = format (flags, "N");
271 s = format (s, "%=12U%=16U%=6s%=20U%U",
272 format_vlib_cpu_time, vnm->vlib_main, e->cpu_time_last_updated,
273 format_ip4_address, &e->ip4_address,
274 flags ? (char *) flags : "",
275 format_ethernet_address, e->ethernet_address,
276 format_vnet_sw_interface_name, vnm, si);
285 } ethernet_arp_input_trace_t;
288 format_ethernet_arp_input_trace (u8 * s, va_list * va)
290 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
291 CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
292 ethernet_arp_input_trace_t *t = va_arg (*va, ethernet_arp_input_trace_t *);
295 format_ethernet_arp_header,
296 t->packet_data, sizeof (t->packet_data));
302 format_arp_term_input_trace (u8 * s, va_list * va)
304 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
305 CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
306 ethernet_arp_input_trace_t *t = va_arg (*va, ethernet_arp_input_trace_t *);
308 /* arp-term trace data saved is either arp or ip6/icmp6 packet:
309 - for arp, the 1st 16-bit field is hw type of value of 0x0001.
310 - for ip6, the first nibble has value of 6. */
311 s = format (s, "%U", t->packet_data[0] == 0 ?
312 format_ethernet_arp_header : format_ip6_header,
313 t->packet_data, sizeof (t->packet_data));
319 arp_nbr_probe (ip_adjacency_t * adj)
321 vnet_main_t *vnm = vnet_get_main ();
322 ip4_main_t *im = &ip4_main;
323 ip_interface_address_t *ia;
324 ethernet_arp_header_t *h;
325 vnet_hw_interface_t *hi;
326 vnet_sw_interface_t *si;
332 vm = vlib_get_main ();
334 si = vnet_get_sw_interface (vnm, adj->rewrite_header.sw_if_index);
336 if (!(si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
342 ip4_interface_address_matching_destination (im,
343 &adj->sub_type.nbr.next_hop.
353 vlib_packet_template_get_packet (vm, &im->ip4_arp_request_packet_template,
356 hi = vnet_get_sup_hw_interface (vnm, adj->rewrite_header.sw_if_index);
358 clib_memcpy (h->ip4_over_ethernet[0].ethernet,
359 hi->hw_address, sizeof (h->ip4_over_ethernet[0].ethernet));
361 h->ip4_over_ethernet[0].ip4 = src[0];
362 h->ip4_over_ethernet[1].ip4 = adj->sub_type.nbr.next_hop.ip4;
364 b = vlib_get_buffer (vm, bi);
365 vnet_buffer (b)->sw_if_index[VLIB_RX] =
366 vnet_buffer (b)->sw_if_index[VLIB_TX] = adj->rewrite_header.sw_if_index;
368 /* Add encapsulation string for software interface (e.g. ethernet header). */
369 vnet_rewrite_one_header (adj[0], h, sizeof (ethernet_header_t));
370 vlib_buffer_advance (b, -adj->rewrite_header.data_bytes);
373 vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index);
374 u32 *to_next = vlib_frame_vector_args (f);
377 vlib_put_frame_to_node (vm, hi->output_node_index, f);
382 arp_mk_complete (adj_index_t ai, ethernet_arp_ip4_entry_t * e)
384 adj_nbr_update_rewrite
385 (ai, ADJ_NBR_REWRITE_FLAG_COMPLETE,
386 ethernet_build_rewrite (vnet_get_main (),
388 adj_get_link_type (ai), e->ethernet_address));
392 arp_mk_incomplete (adj_index_t ai)
394 ip_adjacency_t *adj = adj_get (ai);
396 adj_nbr_update_rewrite
398 ADJ_NBR_REWRITE_FLAG_INCOMPLETE,
399 ethernet_build_rewrite (vnet_get_main (),
400 adj->rewrite_header.sw_if_index,
402 VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST));
405 static ethernet_arp_ip4_entry_t *
406 arp_entry_find (ethernet_arp_interface_t * eai, const ip4_address_t * addr)
408 ethernet_arp_main_t *am = ðernet_arp_main;
409 ethernet_arp_ip4_entry_t *e = NULL;
412 if (NULL != eai->arp_entries)
414 p = hash_get (eai->arp_entries, addr->as_u32);
418 e = pool_elt_at_index (am->ip4_entry_pool, p[0]);
425 arp_mk_complete_walk (adj_index_t ai, void *ctx)
427 ethernet_arp_ip4_entry_t *e = ctx;
429 arp_mk_complete (ai, e);
431 return (ADJ_WALK_RC_CONTINUE);
435 arp_mk_incomplete_walk (adj_index_t ai, void *ctx)
437 arp_mk_incomplete (ai);
439 return (ADJ_WALK_RC_CONTINUE);
443 arp_update_adjacency (vnet_main_t * vnm, u32 sw_if_index, u32 ai)
445 ethernet_arp_main_t *am = ðernet_arp_main;
446 ethernet_arp_interface_t *arp_int;
447 ethernet_arp_ip4_entry_t *e;
452 vec_validate (am->ethernet_arp_by_sw_if_index, sw_if_index);
453 arp_int = &am->ethernet_arp_by_sw_if_index[sw_if_index];
454 e = arp_entry_find (arp_int, &adj->sub_type.nbr.next_hop.ip4);
456 switch (adj->lookup_next_index)
458 case IP_LOOKUP_NEXT_ARP:
459 case IP_LOOKUP_NEXT_GLEAN:
462 adj_nbr_walk_nh4 (sw_if_index,
463 &e->ip4_address, arp_mk_complete_walk, e);
468 * no matching ARP entry.
469 * construct the rewrite required to for an ARP packet, and stick
470 * that in the adj's pipe to smoke.
472 adj_nbr_update_rewrite
474 ADJ_NBR_REWRITE_FLAG_INCOMPLETE,
475 ethernet_build_rewrite
479 VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST));
482 * since the FIB has added this adj for a route, it makes sense it
483 * may want to forward traffic sometime soon. Let's send a
484 * speculative ARP. just one. If we were to do periodically that
485 * wouldn't be bad either, but that's more code than i'm prepared to
486 * write at this time for relatively little reward.
491 case IP_LOOKUP_NEXT_MCAST:
494 * Construct a partial rewrite from the known ethernet mcast dest MAC
499 rewrite = ethernet_build_rewrite (vnm,
502 ethernet_ip4_mcast_dst_addr ());
503 offset = vec_len (rewrite) - 2;
506 * Complete the remaining fields of the adj's rewrite to direct the
507 * complete of the rewrite at switch time by copying in the IP
508 * dst address's bytes.
509 * Ofset is 2 bytes into the MAC desintation address. And we copy 23 bits
512 adj_mcast_update_rewrite (ai, rewrite, offset, 0x007fffff);
516 case IP_LOOKUP_NEXT_DROP:
517 case IP_LOOKUP_NEXT_PUNT:
518 case IP_LOOKUP_NEXT_LOCAL:
519 case IP_LOOKUP_NEXT_REWRITE:
520 case IP_LOOKUP_NEXT_MCAST_MIDCHAIN:
521 case IP_LOOKUP_NEXT_MIDCHAIN:
522 case IP_LOOKUP_NEXT_ICMP_ERROR:
523 case IP_LOOKUP_N_NEXT:
530 arp_adj_fib_add (ethernet_arp_ip4_entry_t * e, u32 fib_index)
534 .fp_proto = FIB_PROTOCOL_IP4,
535 .fp_addr.ip4 = e->ip4_address,
539 fib_table_entry_path_add (fib_index, &pfx, FIB_SOURCE_ADJ,
540 FIB_ENTRY_FLAG_ATTACHED,
541 DPO_PROTO_IP4, &pfx.fp_addr,
542 e->sw_if_index, ~0, 1, NULL,
543 FIB_ROUTE_PATH_FLAG_NONE);
544 fib_table_lock (fib_index, FIB_PROTOCOL_IP4, FIB_SOURCE_ADJ);
548 vnet_arp_set_ip4_over_ethernet_internal (vnet_main_t * vnm,
549 vnet_arp_set_ip4_over_ethernet_rpc_args_t
552 ethernet_arp_ip4_entry_t *e = 0;
553 ethernet_arp_main_t *am = ðernet_arp_main;
554 ethernet_arp_ip4_over_ethernet_address_t *a = &args->a;
555 vlib_main_t *vm = vlib_get_main ();
556 int make_new_arp_cache_entry = 1;
558 pending_resolution_t *pr, *mc;
559 ethernet_arp_interface_t *arp_int;
560 int is_static = args->is_static;
561 u32 sw_if_index = args->sw_if_index;
562 int is_no_fib_entry = args->is_no_fib_entry;
564 vec_validate (am->ethernet_arp_by_sw_if_index, sw_if_index);
566 arp_int = &am->ethernet_arp_by_sw_if_index[sw_if_index];
568 if (NULL != arp_int->arp_entries)
570 p = hash_get (arp_int->arp_entries, a->ip4.as_u32);
573 e = pool_elt_at_index (am->ip4_entry_pool, p[0]);
575 /* Refuse to over-write static arp. */
576 if (!is_static && (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC))
578 make_new_arp_cache_entry = 0;
582 if (make_new_arp_cache_entry)
584 pool_get (am->ip4_entry_pool, e);
586 if (NULL == arp_int->arp_entries)
588 arp_int->arp_entries = hash_create (0, sizeof (u32));
591 hash_set (arp_int->arp_entries, a->ip4.as_u32, e - am->ip4_entry_pool);
593 e->sw_if_index = sw_if_index;
594 e->ip4_address = a->ip4;
595 e->fib_entry_index = FIB_NODE_INDEX_INVALID;
596 clib_memcpy (e->ethernet_address,
597 a->ethernet, sizeof (e->ethernet_address));
599 if (!is_no_fib_entry)
602 ip4_fib_table_get_index_for_sw_if_index
607 e->flags |= ETHERNET_ARP_IP4_ENTRY_FLAG_NO_FIB_ENTRY;
613 * prevent a DoS attack from the data-plane that
614 * spams us with no-op updates to the MAC address
616 if (0 == memcmp (e->ethernet_address,
617 a->ethernet, sizeof (e->ethernet_address)))
618 goto check_customers;
620 /* Update time stamp and ethernet address. */
621 clib_memcpy (e->ethernet_address, a->ethernet,
622 sizeof (e->ethernet_address));
625 e->cpu_time_last_updated = clib_cpu_time_now ();
627 e->flags |= ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC;
629 e->flags |= ETHERNET_ARP_IP4_ENTRY_FLAG_DYNAMIC;
631 adj_nbr_walk_nh4 (sw_if_index, &e->ip4_address, arp_mk_complete_walk, e);
634 /* Customer(s) waiting for this address to be resolved? */
635 p = hash_get (am->pending_resolutions_by_address, a->ip4.as_u32);
641 while (next_index != (u32) ~ 0)
643 pr = pool_elt_at_index (am->pending_resolutions, next_index);
644 vlib_process_signal_event (vm, pr->node_index,
645 pr->type_opaque, pr->data);
646 next_index = pr->next_index;
647 pool_put (am->pending_resolutions, pr);
650 hash_unset (am->pending_resolutions_by_address, a->ip4.as_u32);
653 /* Customer(s) requesting ARP event for this address? */
654 p = hash_get (am->mac_changes_by_address, a->ip4.as_u32);
660 while (next_index != (u32) ~ 0)
662 int (*fp) (u32, u8 *, u32, u32);
664 mc = pool_elt_at_index (am->mac_changes, next_index);
665 fp = mc->data_callback;
667 /* Call the user's data callback, return 1 to suppress dup events */
669 rv = (*fp) (mc->data, a->ethernet, sw_if_index, 0);
672 * Signal the resolver process, as long as the user
673 * says they want to be notified
676 vlib_process_signal_event (vm, mc->node_index,
677 mc->type_opaque, mc->data);
678 next_index = mc->next_index;
686 vnet_register_ip4_arp_resolution_event (vnet_main_t * vnm,
689 uword type_opaque, uword data)
691 ethernet_arp_main_t *am = ðernet_arp_main;
692 ip4_address_t *address = address_arg;
694 pending_resolution_t *pr;
696 pool_get (am->pending_resolutions, pr);
699 pr->node_index = node_index;
700 pr->type_opaque = type_opaque;
702 pr->data_callback = 0;
704 p = hash_get (am->pending_resolutions_by_address, address->as_u32);
707 /* Insert new resolution at the head of the list */
708 pr->next_index = p[0];
709 hash_unset (am->pending_resolutions_by_address, address->as_u32);
712 hash_set (am->pending_resolutions_by_address, address->as_u32,
713 pr - am->pending_resolutions);
717 vnet_add_del_ip4_arp_change_event (vnet_main_t * vnm,
722 uword type_opaque, uword data, int is_add)
724 ethernet_arp_main_t *am = ðernet_arp_main;
725 ip4_address_t *address = address_arg;
727 /* Try to find an existing entry */
728 u32 *first = (u32 *) hash_get (am->mac_changes_by_address, address->as_u32);
730 pending_resolution_t *mc;
731 while (p && *p != ~0)
733 mc = pool_elt_at_index (am->mac_changes, *p);
734 if (mc->node_index == node_index && mc->type_opaque == type_opaque
740 int found = p && *p != ~0;
744 return VNET_API_ERROR_ENTRY_ALREADY_EXISTS;
746 pool_get (am->mac_changes, mc);
747 *mc = (pending_resolution_t)
749 .next_index = ~0,.node_index = node_index,.type_opaque =
750 type_opaque,.data = data,.data_callback = data_callback,.pid =
753 /* Insert new resolution at the end of the list */
754 u32 new_idx = mc - am->mac_changes;
758 hash_set (am->mac_changes_by_address, address->as_u32, new_idx);
763 return VNET_API_ERROR_NO_SUCH_ENTRY;
765 /* Clients may need to clean up pool entries, too */
766 void (*fp) (u32, u8 *) = data_callback;
768 (*fp) (mc->data, 0 /* no new mac addrs */ );
770 /* Remove the entry from the list and delete the entry */
772 pool_put (am->mac_changes, mc);
774 /* Remove from hash if we deleted the last entry */
775 if (*p == ~0 && p == first)
776 hash_unset (am->mac_changes_by_address, address->as_u32);
781 /* Either we drop the packet or we send a reply to the sender. */
785 ARP_INPUT_NEXT_REPLY_TX,
789 #define foreach_ethernet_arp_error \
790 _ (replies_sent, "ARP replies sent") \
791 _ (l2_type_not_ethernet, "L2 type not ethernet") \
792 _ (l3_type_not_ip4, "L3 type not IP4") \
793 _ (l3_src_address_not_local, "IP4 source address not local to subnet") \
794 _ (l3_dst_address_not_local, "IP4 destination address not local to subnet") \
795 _ (l3_src_address_is_local, "IP4 source address matches local interface") \
796 _ (l3_src_address_learned, "ARP request IP4 source address learned") \
797 _ (replies_received, "ARP replies received") \
798 _ (opcode_not_request, "ARP opcode not request") \
799 _ (proxy_arp_replies_sent, "Proxy ARP replies sent") \
800 _ (l2_address_mismatch, "ARP hw addr does not match L2 frame src addr") \
801 _ (gratuitous_arp, "ARP probe or announcement dropped") \
802 _ (interface_no_table, "Interface is not mapped to an IP table") \
803 _ (interface_not_ip_enabled, "Interface is not IP enabled") \
807 #define _(sym,string) ETHERNET_ARP_ERROR_##sym,
808 foreach_ethernet_arp_error
810 ETHERNET_ARP_N_ERROR,
811 } ethernet_arp_input_error_t;
815 unset_random_arp_entry (void)
817 ethernet_arp_main_t *am = ðernet_arp_main;
818 ethernet_arp_ip4_entry_t *e;
819 vnet_main_t *vnm = vnet_get_main ();
820 ethernet_arp_ip4_over_ethernet_address_t delme;
823 index = pool_next_index (am->ip4_entry_pool, am->arp_delete_rotor);
824 am->arp_delete_rotor = index;
826 /* Try again from elt 0, could happen if an intfc goes down */
829 index = pool_next_index (am->ip4_entry_pool, am->arp_delete_rotor);
830 am->arp_delete_rotor = index;
833 /* Nothing left in the pool */
837 e = pool_elt_at_index (am->ip4_entry_pool, index);
839 clib_memcpy (&delme.ethernet, e->ethernet_address, 6);
840 delme.ip4.as_u32 = e->ip4_address.as_u32;
842 vnet_arp_unset_ip4_over_ethernet (vnm, e->sw_if_index, &delme);
846 arp_unnumbered (vlib_buffer_t * p0,
847 u32 input_sw_if_index, u32 conn_sw_if_index)
849 vnet_main_t *vnm = vnet_get_main ();
850 vnet_interface_main_t *vim = &vnm->interface_main;
851 vnet_sw_interface_t *si;
853 /* verify that the input interface is unnumbered to the connected.
854 * the connected interface is the interface on which the subnet is
856 si = &vim->sw_interfaces[input_sw_if_index];
858 if (!(si->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED &&
859 (si->unnumbered_sw_if_index == conn_sw_if_index)))
861 /* the input interface is not unnumbered to the interface on which
862 * the sub-net is configured that covers the ARP request.
863 * So this is not the case for unnumbered.. */
871 arp_learn (vnet_main_t * vnm,
872 ethernet_arp_main_t * am, u32 sw_if_index, void *addr)
874 if (am->limit_arp_cache_size &&
875 pool_elts (am->ip4_entry_pool) >= am->limit_arp_cache_size)
876 unset_random_arp_entry ();
878 vnet_arp_set_ip4_over_ethernet (vnm, sw_if_index, addr, 0, 0);
879 return (ETHERNET_ARP_ERROR_l3_src_address_learned);
883 arp_input (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
885 ethernet_arp_main_t *am = ðernet_arp_main;
886 vnet_main_t *vnm = vnet_get_main ();
887 ip4_main_t *im4 = &ip4_main;
888 u32 n_left_from, next_index, *from, *to_next;
889 u32 n_replies_sent = 0, n_proxy_arp_replies_sent = 0;
891 from = vlib_frame_vector_args (frame);
892 n_left_from = frame->n_vectors;
893 next_index = node->cached_next_index;
895 if (node->flags & VLIB_NODE_FLAG_TRACE)
896 vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
898 sizeof (ethernet_arp_input_trace_t));
900 while (n_left_from > 0)
904 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
906 while (n_left_from > 0 && n_left_to_next > 0)
909 vnet_hw_interface_t *hw_if0;
910 ethernet_arp_header_t *arp0;
911 ethernet_header_t *eth_rx, *eth_tx;
912 ip4_address_t *if_addr0, proxy_src;
913 u32 pi0, error0, next0, sw_if_index0, conn_sw_if_index0, fib_index0;
914 u8 is_request0, dst_is_local0, is_unnum0, is_vrrp_reply0;
915 ethernet_proxy_arp_t *pa;
916 fib_node_index_t dst_fei, src_fei;
918 fib_entry_flag_t src_flags, dst_flags;
919 u8 *rewrite0, rewrite0_len;
929 p0 = vlib_get_buffer (vm, pi0);
930 arp0 = vlib_buffer_get_current (p0);
931 /* Fill in ethernet header. */
932 eth_rx = ethernet_buffer_get_header (p0);
934 is_request0 = arp0->opcode
935 == clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_request);
937 error0 = ETHERNET_ARP_ERROR_replies_sent;
941 clib_net_to_host_u16 (ETHERNET_ARP_HARDWARE_TYPE_ethernet) ?
942 ETHERNET_ARP_ERROR_l2_type_not_ethernet : error0);
945 clib_net_to_host_u16 (ETHERNET_TYPE_IP4) ?
946 ETHERNET_ARP_ERROR_l3_type_not_ip4 : error0);
948 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
950 /* not playing the ARP game if the interface is not IPv4 enabled */
952 (im4->ip_enabled_by_sw_if_index[sw_if_index0] == 0 ?
953 ETHERNET_ARP_ERROR_interface_not_ip_enabled : error0);
958 /* Check that IP address is local and matches incoming interface. */
959 fib_index0 = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);
960 if (~0 == fib_index0)
962 error0 = ETHERNET_ARP_ERROR_interface_no_table;
966 dst_fei = ip4_fib_table_lookup (ip4_fib_get (fib_index0),
967 &arp0->ip4_over_ethernet[1].ip4,
969 dst_flags = fib_entry_get_flags (dst_fei);
971 conn_sw_if_index0 = fib_entry_get_resolving_interface (dst_fei);
973 /* Honor unnumbered interface, if any */
974 is_unnum0 = sw_if_index0 != conn_sw_if_index0;
978 * we're looking for FIB entries that indicate the source
979 * is attached. There may be more specific non-attached
980 * routes tht match the source, but these do not influence
981 * whether we respond to an ARP request, i.e. they do not
982 * influence whether we are the correct way for the sender
983 * to reach us, they only affect how we reach the sender.
985 fib_entry_t *src_fib_entry;
986 fib_entry_src_t *src;
997 src_fei = ip4_fib_table_lookup (ip4_fib_get (fib_index0),
999 ip4_over_ethernet[0].ip4,
1001 src_fib_entry = fib_entry_get (src_fei);
1004 * It's possible that the source that provides the
1005 * flags we need, or the flags we must not have,
1006 * is not the best source, so check then all.
1009 FOR_EACH_SRC_ADDED(src_fib_entry, src, source,
1011 src_flags = fib_entry_get_flags_for_source (src_fei, source);
1013 /* Reject requests/replies with our local interface
1015 if (FIB_ENTRY_FLAG_LOCAL & src_flags)
1017 error0 = ETHERNET_ARP_ERROR_l3_src_address_is_local;
1019 * When VPP has an interface whose address is also
1020 * applied to a TAP interface on the host, then VPP's
1021 * TAP interface will be unnumbered to the 'real'
1022 * interface and do proxy ARP from the host.
1023 * The curious aspect of this setup is that ARP requests
1024 * from the host will come from the VPP's own address.
1025 * So don't drop immediately here, instead go see if this
1026 * is a proxy ARP case.
1030 /* A Source must also be local to subnet of matching
1031 * interface address. */
1032 if ((FIB_ENTRY_FLAG_ATTACHED & src_flags) ||
1033 (FIB_ENTRY_FLAG_CONNECTED & src_flags))
1040 * The packet was sent from an address that is not
1041 * connected nor attached i.e. it is not from an
1042 * address that is covered by a link's sub-net,
1043 * nor is it a already learned host resp.
1049 * shorter mask lookup for the next iteration.
1051 fib_entry_get_prefix (src_fei, &pfx);
1052 mask = pfx.fp_len - 1;
1055 * continue until we hit the default route or we find
1056 * the attached we are looking for. The most likely
1057 * outcome is we find the attached with the first source
1058 * on the first lookup.
1062 !fib_entry_is_sourced (src_fei, FIB_SOURCE_DEFAULT_ROUTE));
1067 * the matching route is a not attached, i.e. it was
1068 * added as a result of routing, rather than interface/ARP
1069 * configuration. If the matching route is not a host route
1072 error0 = ETHERNET_ARP_ERROR_l3_src_address_not_local;
1077 if (!(FIB_ENTRY_FLAG_CONNECTED & dst_flags))
1079 error0 = ETHERNET_ARP_ERROR_l3_dst_address_not_local;
1083 if (sw_if_index0 != fib_entry_get_resolving_interface (src_fei))
1086 * The interface the ARP was received on is not the interface
1087 * on which the covering prefix is configured. Maybe this is a
1088 * case for unnumbered.
1093 dst_is_local0 = (FIB_ENTRY_FLAG_LOCAL & dst_flags);
1094 fib_entry_get_prefix (dst_fei, &pfx0);
1095 if_addr0 = &pfx0.fp_addr.ip4;
1099 clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply))
1102 (arp0->ip4_over_ethernet[0].ethernet, vrrp_prefix,
1103 sizeof (vrrp_prefix))));
1105 /* Trash ARP packets whose ARP-level source addresses do not
1106 match their L2-frame-level source addresses, unless it's
1107 a reply from a VRRP virtual router */
1109 (eth_rx->src_address, arp0->ip4_over_ethernet[0].ethernet,
1110 sizeof (eth_rx->src_address)) && !is_vrrp_reply0)
1112 error0 = ETHERNET_ARP_ERROR_l2_address_mismatch;
1116 /* Learn or update sender's mapping only for replies to addresses
1117 * that are local to the subnet */
1119 clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply) &&
1122 error0 = arp_learn (vnm, am, sw_if_index0,
1123 &arp0->ip4_over_ethernet[0]);
1129 An adjacency to the sender is not always present,
1130 so we use the interface to build us a rewrite string
1131 which will contain all the necessary tags. */
1132 rewrite0 = ethernet_build_rewrite (vnm, sw_if_index0,
1134 eth_rx->src_address);
1135 rewrite0_len = vec_len (rewrite0);
1137 /* Figure out how much to rewind current data from adjacency. */
1138 vlib_buffer_advance (p0, -rewrite0_len);
1139 eth_tx = vlib_buffer_get_current (p0);
1141 vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
1142 hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
1144 /* Send reply back through input interface */
1145 vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
1146 next0 = ARP_INPUT_NEXT_REPLY_TX;
1148 arp0->opcode = clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply);
1150 arp0->ip4_over_ethernet[1] = arp0->ip4_over_ethernet[0];
1152 clib_memcpy (arp0->ip4_over_ethernet[0].ethernet,
1153 hw_if0->hw_address, 6);
1154 clib_mem_unaligned (&arp0->ip4_over_ethernet[0].ip4.data_u32, u32) =
1157 /* Hardware must be ethernet-like. */
1158 ASSERT (vec_len (hw_if0->hw_address) == 6);
1160 /* the rx nd tx ethernet headers wil overlap in the case
1161 * when we received a tagged VLAN=0 packet, but we are sending
1163 clib_memcpy (eth_tx, rewrite0, vec_len (rewrite0));
1164 vec_free (rewrite0);
1170 if (!arp_unnumbered (p0, sw_if_index0, conn_sw_if_index0))
1175 /* We are going to reply to this request, so, in the absence of
1176 errors, learn the sender */
1178 error0 = arp_learn (vnm, am, sw_if_index0,
1179 &arp0->ip4_over_ethernet[1]);
1181 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1182 n_left_to_next, pi0, next0);
1184 n_replies_sent += 1;
1188 if (0 == arp0->ip4_over_ethernet[0].ip4.as_u32 ||
1189 (arp0->ip4_over_ethernet[0].ip4.as_u32 ==
1190 arp0->ip4_over_ethernet[1].ip4.as_u32))
1192 error0 = ETHERNET_ARP_ERROR_gratuitous_arp;
1195 /* See if proxy arp is configured for the address */
1198 vnet_sw_interface_t *si;
1199 u32 this_addr = clib_net_to_host_u32
1200 (arp0->ip4_over_ethernet[1].ip4.as_u32);
1203 si = vnet_get_sw_interface (vnm, sw_if_index0);
1205 if (!(si->flags & VNET_SW_INTERFACE_FLAG_PROXY_ARP))
1208 fib_index0 = vec_elt (im4->fib_index_by_sw_if_index,
1211 vec_foreach (pa, am->proxy_arps)
1213 u32 lo_addr = clib_net_to_host_u32 (pa->lo_addr);
1214 u32 hi_addr = clib_net_to_host_u32 (pa->hi_addr);
1216 /* an ARP request hit in the proxy-arp table? */
1217 if ((this_addr >= lo_addr && this_addr <= hi_addr) &&
1218 (fib_index0 == pa->fib_index))
1221 arp0->ip4_over_ethernet[1].ip4.data_u32;
1224 * change the interface address to the proxied
1226 if_addr0 = &proxy_src;
1228 n_proxy_arp_replies_sent++;
1236 next0 = ARP_INPUT_NEXT_DROP;
1237 p0->error = node->errors[error0];
1239 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1240 n_left_to_next, pi0, next0);
1243 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1246 vlib_error_count (vm, node->node_index,
1247 ETHERNET_ARP_ERROR_replies_sent,
1248 n_replies_sent - n_proxy_arp_replies_sent);
1250 vlib_error_count (vm, node->node_index,
1251 ETHERNET_ARP_ERROR_proxy_arp_replies_sent,
1252 n_proxy_arp_replies_sent);
1253 return frame->n_vectors;
1256 static char *ethernet_arp_error_strings[] = {
1257 #define _(sym,string) string,
1258 foreach_ethernet_arp_error
1263 VLIB_REGISTER_NODE (arp_input_node, static) =
1265 .function = arp_input,
1266 .name = "arp-input",
1267 .vector_size = sizeof (u32),
1268 .n_errors = ETHERNET_ARP_N_ERROR,
1269 .error_strings = ethernet_arp_error_strings,
1270 .n_next_nodes = ARP_INPUT_N_NEXT,
1272 [ARP_INPUT_NEXT_DROP] = "error-drop",
1273 [ARP_INPUT_NEXT_REPLY_TX] = "interface-output",
1275 .format_buffer = format_ethernet_arp_header,
1276 .format_trace = format_ethernet_arp_input_trace,
1281 ip4_arp_entry_sort (void *a1, void *a2)
1283 ethernet_arp_ip4_entry_t *e1 = a1;
1284 ethernet_arp_ip4_entry_t *e2 = a2;
1287 vnet_main_t *vnm = vnet_get_main ();
1289 cmp = vnet_sw_interface_compare (vnm, e1->sw_if_index, e2->sw_if_index);
1291 cmp = ip4_address_compare (&e1->ip4_address, &e2->ip4_address);
1295 ethernet_arp_ip4_entry_t *
1296 ip4_neighbor_entries (u32 sw_if_index)
1298 ethernet_arp_main_t *am = ðernet_arp_main;
1299 ethernet_arp_ip4_entry_t *n, *ns = 0;
1302 pool_foreach (n, am->ip4_entry_pool, ({
1303 if (sw_if_index != ~0 && n->sw_if_index != sw_if_index)
1305 vec_add1 (ns, n[0]);
1310 vec_sort_with_function (ns, ip4_arp_entry_sort);
1314 static clib_error_t *
1315 show_ip4_arp (vlib_main_t * vm,
1316 unformat_input_t * input, vlib_cli_command_t * cmd)
1318 vnet_main_t *vnm = vnet_get_main ();
1319 ethernet_arp_main_t *am = ðernet_arp_main;
1320 ethernet_arp_ip4_entry_t *e, *es;
1321 ethernet_proxy_arp_t *pa;
1322 clib_error_t *error = 0;
1325 /* Filter entries by interface if given. */
1327 (void) unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index);
1329 es = ip4_neighbor_entries (sw_if_index);
1332 vlib_cli_output (vm, "%U", format_ethernet_arp_ip4_entry, vnm, 0);
1335 vlib_cli_output (vm, "%U", format_ethernet_arp_ip4_entry, vnm, e);
1340 if (vec_len (am->proxy_arps))
1342 vlib_cli_output (vm, "Proxy arps enabled for:");
1343 vec_foreach (pa, am->proxy_arps)
1345 vlib_cli_output (vm, "Fib_index %d %U - %U ",
1347 format_ip4_address, &pa->lo_addr,
1348 format_ip4_address, &pa->hi_addr);
1356 * Display all the IPv4 ARP entries.
1359 * Example of how to display the IPv4 ARP table:
1360 * @cliexstart{show ip arp}
1361 * Time FIB IP4 Flags Ethernet Interface
1362 * 346.3028 0 6.1.1.3 de:ad:be:ef:ba:be GigabitEthernet2/0/0
1363 * 3077.4271 0 6.1.1.4 S de:ad:be:ef:ff:ff GigabitEthernet2/0/0
1364 * 2998.6409 1 6.2.2.3 de:ad:be:ef:00:01 GigabitEthernet2/0/0
1365 * Proxy arps enabled for:
1366 * Fib_index 0 6.0.0.1 - 6.0.0.11
1370 VLIB_CLI_COMMAND (show_ip4_arp_command, static) = {
1371 .path = "show ip arp",
1372 .function = show_ip4_arp,
1373 .short_help = "show ip arp",
1379 pg_edit_t l2_type, l3_type;
1380 pg_edit_t n_l2_address_bytes, n_l3_address_bytes;
1386 } ip4_over_ethernet[2];
1387 } pg_ethernet_arp_header_t;
1390 pg_ethernet_arp_header_init (pg_ethernet_arp_header_t * p)
1392 /* Initialize fields that are not bit fields in the IP header. */
1393 #define _(f) pg_edit_init (&p->f, ethernet_arp_header_t, f);
1396 _(n_l2_address_bytes);
1397 _(n_l3_address_bytes);
1399 _(ip4_over_ethernet[0].ethernet);
1400 _(ip4_over_ethernet[0].ip4);
1401 _(ip4_over_ethernet[1].ethernet);
1402 _(ip4_over_ethernet[1].ip4);
1407 unformat_pg_arp_header (unformat_input_t * input, va_list * args)
1409 pg_stream_t *s = va_arg (*args, pg_stream_t *);
1410 pg_ethernet_arp_header_t *p;
1413 p = pg_create_edit_group (s, sizeof (p[0]), sizeof (ethernet_arp_header_t),
1415 pg_ethernet_arp_header_init (p);
1418 pg_edit_set_fixed (&p->l2_type, ETHERNET_ARP_HARDWARE_TYPE_ethernet);
1419 pg_edit_set_fixed (&p->l3_type, ETHERNET_TYPE_IP4);
1420 pg_edit_set_fixed (&p->n_l2_address_bytes, 6);
1421 pg_edit_set_fixed (&p->n_l3_address_bytes, 4);
1423 if (!unformat (input, "%U: %U/%U -> %U/%U",
1425 unformat_ethernet_arp_opcode_net_byte_order, &p->opcode,
1427 unformat_ethernet_address, &p->ip4_over_ethernet[0].ethernet,
1429 unformat_ip4_address, &p->ip4_over_ethernet[0].ip4,
1431 unformat_ethernet_address, &p->ip4_over_ethernet[1].ethernet,
1433 unformat_ip4_address, &p->ip4_over_ethernet[1].ip4))
1435 /* Free up any edits we may have added. */
1436 pg_free_edit_group (s);
1443 ip4_set_arp_limit (u32 arp_limit)
1445 ethernet_arp_main_t *am = ðernet_arp_main;
1447 am->limit_arp_cache_size = arp_limit;
1452 * @brief Control Plane hook to remove an ARP entry
1455 vnet_arp_unset_ip4_over_ethernet (vnet_main_t * vnm,
1456 u32 sw_if_index, void *a_arg)
1458 ethernet_arp_ip4_over_ethernet_address_t *a = a_arg;
1459 vnet_arp_set_ip4_over_ethernet_rpc_args_t args;
1461 args.sw_if_index = sw_if_index;
1462 args.flags = ETHERNET_ARP_ARGS_REMOVE;
1463 clib_memcpy (&args.a, a, sizeof (*a));
1465 vl_api_rpc_call_main_thread (set_ip4_over_ethernet_rpc_callback,
1466 (u8 *) & args, sizeof (args));
1471 * @brief Internally generated event to flush the ARP cache on an
1472 * interface state change event.
1473 * A flush will remove dynamic ARP entries, and for statics remove the MAC
1474 * address from the corresponding adjacencies.
1477 vnet_arp_flush_ip4_over_ethernet (vnet_main_t * vnm,
1478 u32 sw_if_index, void *a_arg)
1480 ethernet_arp_ip4_over_ethernet_address_t *a = a_arg;
1481 vnet_arp_set_ip4_over_ethernet_rpc_args_t args;
1483 args.sw_if_index = sw_if_index;
1484 args.flags = ETHERNET_ARP_ARGS_FLUSH;
1485 clib_memcpy (&args.a, a, sizeof (*a));
1487 vl_api_rpc_call_main_thread (set_ip4_over_ethernet_rpc_callback,
1488 (u8 *) & args, sizeof (args));
1493 * @brief Internally generated event to populate the ARP cache on an
1494 * interface state change event.
1495 * For static entries this will re-source the adjacencies.
1497 * @param sw_if_index The interface on which the ARP entires are acted
1500 vnet_arp_populate_ip4_over_ethernet (vnet_main_t * vnm,
1501 u32 sw_if_index, void *a_arg)
1503 ethernet_arp_ip4_over_ethernet_address_t *a = a_arg;
1504 vnet_arp_set_ip4_over_ethernet_rpc_args_t args;
1506 args.sw_if_index = sw_if_index;
1507 args.flags = ETHERNET_ARP_ARGS_POPULATE;
1508 clib_memcpy (&args.a, a, sizeof (*a));
1510 vl_api_rpc_call_main_thread (set_ip4_over_ethernet_rpc_callback,
1511 (u8 *) & args, sizeof (args));
1516 * @brief publish wildcard arp event
1517 * @param sw_if_index The interface on which the ARP entires are acted
1520 vnet_arp_wc_publish (u32 sw_if_index, void *a_arg)
1522 ethernet_arp_ip4_over_ethernet_address_t *a = a_arg;
1523 vnet_arp_set_ip4_over_ethernet_rpc_args_t args = {
1524 .flags = ETHERNET_ARP_ARGS_WC_PUB,
1525 .sw_if_index = sw_if_index,
1529 vl_api_rpc_call_main_thread (set_ip4_over_ethernet_rpc_callback,
1530 (u8 *) & args, sizeof (args));
1535 vnet_arp_wc_publish_internal (vnet_main_t * vnm,
1536 vnet_arp_set_ip4_over_ethernet_rpc_args_t *
1539 vlib_main_t *vm = vlib_get_main ();
1540 ethernet_arp_main_t *am = ðernet_arp_main;
1541 uword ni = am->wc_ip4_arp_publisher_node;
1542 uword et = am->wc_ip4_arp_publisher_et;
1544 if (ni == (uword) ~ 0)
1546 wc_arp_report_t *r =
1547 vlib_process_signal_event_data (vm, ni, et, 1, sizeof *r);
1548 r->ip4 = args->a.ip4.as_u32;
1549 r->sw_if_index = args->sw_if_index;
1550 memcpy (r->mac, args->a.ethernet, sizeof r->mac);
1554 wc_arp_set_publisher_node (uword node_index, uword event_type)
1556 ethernet_arp_main_t *am = ðernet_arp_main;
1557 am->wc_ip4_arp_publisher_node = node_index;
1558 am->wc_ip4_arp_publisher_et = event_type;
1562 * arp_add_del_interface_address
1564 * callback when an interface address is added or deleted
1567 arp_add_del_interface_address (ip4_main_t * im,
1570 ip4_address_t * address,
1572 u32 if_address_index, u32 is_del)
1575 * Flush the ARP cache of all entries covered by the address
1576 * that is being removed.
1578 ethernet_arp_main_t *am = ðernet_arp_main;
1579 ethernet_arp_ip4_entry_t *e;
1581 if (vec_len (am->ethernet_arp_by_sw_if_index) <= sw_if_index)
1586 ethernet_arp_interface_t *eai;
1587 u32 i, *to_delete = 0;
1590 eai = &am->ethernet_arp_by_sw_if_index[sw_if_index];
1593 hash_foreach_pair (pair, eai->arp_entries,
1595 e = pool_elt_at_index(am->ip4_entry_pool,
1597 if (ip4_destination_matches_route (im, &e->ip4_address,
1598 address, address_length))
1600 vec_add1 (to_delete, e - am->ip4_entry_pool);
1605 for (i = 0; i < vec_len (to_delete); i++)
1607 ethernet_arp_ip4_over_ethernet_address_t delme;
1608 e = pool_elt_at_index (am->ip4_entry_pool, to_delete[i]);
1610 clib_memcpy (&delme.ethernet, e->ethernet_address, 6);
1611 delme.ip4.as_u32 = e->ip4_address.as_u32;
1613 vnet_arp_flush_ip4_over_ethernet (vnet_get_main (),
1614 e->sw_if_index, &delme);
1617 vec_free (to_delete);
1622 arp_adj_fib_remove (ethernet_arp_ip4_entry_t * e, u32 fib_index)
1624 if (FIB_NODE_INDEX_INVALID != e->fib_entry_index)
1626 fib_prefix_t pfx = {
1628 .fp_proto = FIB_PROTOCOL_IP4,
1629 .fp_addr.ip4 = e->ip4_address,
1633 fib_index = ip4_fib_table_get_index_for_sw_if_index (e->sw_if_index);
1635 fib_table_entry_path_remove (fib_index, &pfx,
1639 e->sw_if_index, ~0, 1,
1640 FIB_ROUTE_PATH_FLAG_NONE);
1641 fib_table_unlock (fib_index, FIB_PROTOCOL_IP4, FIB_SOURCE_ADJ);
1646 arp_table_bind (ip4_main_t * im,
1648 u32 sw_if_index, u32 new_fib_index, u32 old_fib_index)
1650 ethernet_arp_main_t *am = ðernet_arp_main;
1651 ethernet_arp_interface_t *eai;
1652 ethernet_arp_ip4_entry_t *e;
1656 * the IP table that the interface is bound to has changed.
1657 * reinstall all the adj fibs.
1660 if (vec_len (am->ethernet_arp_by_sw_if_index) <= sw_if_index)
1663 eai = &am->ethernet_arp_by_sw_if_index[sw_if_index];
1666 hash_foreach_pair (pair, eai->arp_entries,
1668 e = pool_elt_at_index(am->ip4_entry_pool,
1671 * remove the adj-fib from the old table and add to the new
1673 arp_adj_fib_remove(e, old_fib_index);
1674 arp_adj_fib_add(e, new_fib_index);
1680 static clib_error_t *
1681 ethernet_arp_init (vlib_main_t * vm)
1683 ethernet_arp_main_t *am = ðernet_arp_main;
1684 ip4_main_t *im = &ip4_main;
1685 clib_error_t *error;
1688 if ((error = vlib_call_init_function (vm, ethernet_init)))
1691 ethernet_register_input_type (vm, ETHERNET_TYPE_ARP, arp_input_node.index);
1693 pn = pg_get_node (arp_input_node.index);
1694 pn->unformat_edit = unformat_pg_arp_header;
1696 am->opcode_by_name = hash_create_string (0, sizeof (uword));
1697 #define _(o) hash_set_mem (am->opcode_by_name, #o, ETHERNET_ARP_OPCODE_##o);
1698 foreach_ethernet_arp_opcode;
1701 /* $$$ configurable */
1702 am->limit_arp_cache_size = 50000;
1704 am->pending_resolutions_by_address = hash_create (0, sizeof (uword));
1705 am->mac_changes_by_address = hash_create (0, sizeof (uword));
1706 am->wc_ip4_arp_publisher_node = (uword) ~ 0;
1708 /* don't trace ARP error packets */
1710 vlib_node_runtime_t *rt =
1711 vlib_node_get_runtime (vm, arp_input_node.index);
1714 vnet_pcap_drop_trace_filter_add_del \
1715 (rt->errors[ETHERNET_ARP_ERROR_##a], \
1717 foreach_ethernet_arp_error
1721 ip4_add_del_interface_address_callback_t cb;
1722 cb.function = arp_add_del_interface_address;
1723 cb.function_opaque = 0;
1724 vec_add1 (im->add_del_interface_address_callbacks, cb);
1726 ip4_table_bind_callback_t cbt;
1727 cbt.function = arp_table_bind;
1728 cbt.function_opaque = 0;
1729 vec_add1 (im->table_bind_callbacks, cbt);
1734 VLIB_INIT_FUNCTION (ethernet_arp_init);
1737 arp_entry_free (ethernet_arp_interface_t * eai, ethernet_arp_ip4_entry_t * e)
1739 ethernet_arp_main_t *am = ðernet_arp_main;
1741 arp_adj_fib_remove (e,
1742 ip4_fib_table_get_index_for_sw_if_index
1744 hash_unset (eai->arp_entries, e->ip4_address.as_u32);
1745 pool_put (am->ip4_entry_pool, e);
1749 vnet_arp_unset_ip4_over_ethernet_internal (vnet_main_t * vnm,
1750 vnet_arp_set_ip4_over_ethernet_rpc_args_t
1753 ethernet_arp_main_t *am = ðernet_arp_main;
1754 ethernet_arp_ip4_entry_t *e;
1755 ethernet_arp_interface_t *eai;
1757 if (vec_len (am->ethernet_arp_by_sw_if_index) <= args->sw_if_index)
1760 eai = &am->ethernet_arp_by_sw_if_index[args->sw_if_index];
1762 e = arp_entry_find (eai, &args->a.ip4);
1766 arp_entry_free (eai, e);
1768 adj_nbr_walk_nh4 (e->sw_if_index,
1769 &e->ip4_address, arp_mk_incomplete_walk, NULL);
1776 vnet_arp_flush_ip4_over_ethernet_internal (vnet_main_t * vnm,
1777 vnet_arp_set_ip4_over_ethernet_rpc_args_t
1780 ethernet_arp_main_t *am = ðernet_arp_main;
1781 ethernet_arp_ip4_entry_t *e;
1782 ethernet_arp_interface_t *eai;
1784 if (vec_len (am->ethernet_arp_by_sw_if_index) <= args->sw_if_index)
1787 eai = &am->ethernet_arp_by_sw_if_index[args->sw_if_index];
1789 e = arp_entry_find (eai, &args->a.ip4);
1793 adj_nbr_walk_nh4 (e->sw_if_index,
1794 &e->ip4_address, arp_mk_incomplete_walk, e);
1797 * The difference between flush and unset, is that an unset
1798 * means delete for static and dynamic entries. A flush
1799 * means delete only for dynamic. Flushing is what the DP
1800 * does in response to interface events. unset is only done
1801 * by the control plane.
1803 if (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC)
1805 e->flags &= ETHERNET_ARP_IP4_ENTRY_FLAG_DYNAMIC;
1807 else if (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_DYNAMIC)
1809 arp_entry_free (eai, e);
1816 vnet_arp_populate_ip4_over_ethernet_internal (vnet_main_t * vnm,
1817 vnet_arp_set_ip4_over_ethernet_rpc_args_t
1820 ethernet_arp_main_t *am = ðernet_arp_main;
1821 ethernet_arp_ip4_entry_t *e;
1822 ethernet_arp_interface_t *eai;
1824 vec_validate (am->ethernet_arp_by_sw_if_index, args->sw_if_index);
1825 eai = &am->ethernet_arp_by_sw_if_index[args->sw_if_index];
1827 e = arp_entry_find (eai, &args->a.ip4);
1831 adj_nbr_walk_nh4 (e->sw_if_index,
1832 &e->ip4_address, arp_mk_complete_walk, e);
1838 set_ip4_over_ethernet_rpc_callback (vnet_arp_set_ip4_over_ethernet_rpc_args_t
1841 vnet_main_t *vm = vnet_get_main ();
1842 ASSERT (vlib_get_thread_index () == 0);
1844 if (a->flags & ETHERNET_ARP_ARGS_REMOVE)
1845 vnet_arp_unset_ip4_over_ethernet_internal (vm, a);
1846 else if (a->flags & ETHERNET_ARP_ARGS_FLUSH)
1847 vnet_arp_flush_ip4_over_ethernet_internal (vm, a);
1848 else if (a->flags & ETHERNET_ARP_ARGS_POPULATE)
1849 vnet_arp_populate_ip4_over_ethernet_internal (vm, a);
1850 else if (a->flags & ETHERNET_ARP_ARGS_WC_PUB)
1851 vnet_arp_wc_publish_internal (vm, a);
1853 vnet_arp_set_ip4_over_ethernet_internal (vm, a);
1857 * @brief Invoked when the interface's admin state changes
1859 static clib_error_t *
1860 ethernet_arp_sw_interface_up_down (vnet_main_t * vnm,
1861 u32 sw_if_index, u32 flags)
1863 ethernet_arp_main_t *am = ðernet_arp_main;
1864 ethernet_arp_ip4_entry_t *e;
1865 u32 i, *to_delete = 0;
1868 pool_foreach (e, am->ip4_entry_pool,
1870 if (e->sw_if_index == sw_if_index)
1871 vec_add1 (to_delete,
1872 e - am->ip4_entry_pool);
1876 for (i = 0; i < vec_len (to_delete); i++)
1878 ethernet_arp_ip4_over_ethernet_address_t delme;
1879 e = pool_elt_at_index (am->ip4_entry_pool, to_delete[i]);
1881 clib_memcpy (&delme.ethernet, e->ethernet_address, 6);
1882 delme.ip4.as_u32 = e->ip4_address.as_u32;
1884 if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
1886 vnet_arp_populate_ip4_over_ethernet (vnm, e->sw_if_index, &delme);
1890 vnet_arp_flush_ip4_over_ethernet (vnm, e->sw_if_index, &delme);
1894 vec_free (to_delete);
1899 VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (ethernet_arp_sw_interface_up_down);
1902 increment_ip4_and_mac_address (ethernet_arp_ip4_over_ethernet_address_t * a)
1907 for (i = 3; i >= 0; i--)
1909 old = a->ip4.as_u8[i];
1910 a->ip4.as_u8[i] += 1;
1911 if (old < a->ip4.as_u8[i])
1915 for (i = 5; i >= 0; i--)
1917 old = a->ethernet[i];
1918 a->ethernet[i] += 1;
1919 if (old < a->ethernet[i])
1925 vnet_arp_set_ip4_over_ethernet (vnet_main_t * vnm,
1926 u32 sw_if_index, void *a_arg,
1927 int is_static, int is_no_fib_entry)
1929 ethernet_arp_ip4_over_ethernet_address_t *a = a_arg;
1930 vnet_arp_set_ip4_over_ethernet_rpc_args_t args;
1932 args.sw_if_index = sw_if_index;
1933 args.is_static = is_static;
1934 args.is_no_fib_entry = is_no_fib_entry;
1936 clib_memcpy (&args.a, a, sizeof (*a));
1938 vl_api_rpc_call_main_thread (set_ip4_over_ethernet_rpc_callback,
1939 (u8 *) & args, sizeof (args));
1944 vnet_proxy_arp_add_del (ip4_address_t * lo_addr,
1945 ip4_address_t * hi_addr, u32 fib_index, int is_del)
1947 ethernet_arp_main_t *am = ðernet_arp_main;
1948 ethernet_proxy_arp_t *pa;
1949 u32 found_at_index = ~0;
1951 vec_foreach (pa, am->proxy_arps)
1953 if (pa->lo_addr == lo_addr->as_u32
1954 && pa->hi_addr == hi_addr->as_u32 && pa->fib_index == fib_index)
1956 found_at_index = pa - am->proxy_arps;
1961 if (found_at_index != ~0)
1963 /* Delete, otherwise it's already in the table */
1965 vec_delete (am->proxy_arps, 1, found_at_index);
1968 /* delete, no such entry */
1970 return VNET_API_ERROR_NO_SUCH_ENTRY;
1972 /* add, not in table */
1973 vec_add2 (am->proxy_arps, pa, 1);
1974 pa->lo_addr = lo_addr->as_u32;
1975 pa->hi_addr = hi_addr->as_u32;
1976 pa->fib_index = fib_index;
1981 * Remove any proxy arp entries asdociated with the
1985 vnet_proxy_arp_fib_reset (u32 fib_id)
1987 ethernet_arp_main_t *am = ðernet_arp_main;
1988 ethernet_proxy_arp_t *pa;
1989 u32 *entries_to_delete = 0;
1993 fib_index = fib_table_find (FIB_PROTOCOL_IP4, fib_id);
1994 if (~0 == fib_index)
1995 return VNET_API_ERROR_NO_SUCH_ENTRY;
1997 vec_foreach (pa, am->proxy_arps)
1999 if (pa->fib_index == fib_index)
2001 vec_add1 (entries_to_delete, pa - am->proxy_arps);
2005 for (i = 0; i < vec_len (entries_to_delete); i++)
2007 vec_delete (am->proxy_arps, 1, entries_to_delete[i]);
2010 vec_free (entries_to_delete);
2015 static clib_error_t *
2016 ip_arp_add_del_command_fn (vlib_main_t * vm,
2017 unformat_input_t * input, vlib_cli_command_t * cmd)
2019 vnet_main_t *vnm = vnet_get_main ();
2021 ethernet_arp_ip4_over_ethernet_address_t lo_addr, hi_addr, addr;
2028 int is_no_fib_entry = 0;
2031 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2033 /* set ip arp TenGigE1/1/0/1 1.2.3.4 aa:bb:... or aabb.ccdd... */
2034 if (unformat (input, "%U %U %U",
2035 unformat_vnet_sw_interface, vnm, &sw_if_index,
2036 unformat_ip4_address, &addr.ip4,
2037 unformat_ethernet_address, &addr.ethernet))
2040 else if (unformat (input, "delete") || unformat (input, "del"))
2043 else if (unformat (input, "static"))
2046 else if (unformat (input, "no-fib-entry"))
2047 is_no_fib_entry = 1;
2049 else if (unformat (input, "count %d", &count))
2052 else if (unformat (input, "fib-id %d", &fib_id))
2054 fib_index = fib_table_find (FIB_PROTOCOL_IP4, fib_id);
2056 if (~0 == fib_index)
2057 return clib_error_return (0, "fib ID %d doesn't exist\n", fib_id);
2060 else if (unformat (input, "proxy %U - %U",
2061 unformat_ip4_address, &lo_addr.ip4,
2062 unformat_ip4_address, &hi_addr.ip4))
2070 (void) vnet_proxy_arp_add_del (&lo_addr.ip4, &hi_addr.ip4,
2079 for (i = 0; i < count; i++)
2083 uword event_type, *event_data = 0;
2085 /* Park the debug CLI until the arp entry is installed */
2086 vnet_register_ip4_arp_resolution_event
2087 (vnm, &addr.ip4, vlib_current_process (vm),
2088 1 /* type */ , 0 /* data */ );
2090 vnet_arp_set_ip4_over_ethernet
2091 (vnm, sw_if_index, &addr, is_static, is_no_fib_entry);
2093 vlib_process_wait_for_event (vm);
2094 event_type = vlib_process_get_events (vm, &event_data);
2095 vec_reset_length (event_data);
2096 if (event_type != 1)
2097 clib_warning ("event type %d unexpected", event_type);
2100 vnet_arp_unset_ip4_over_ethernet (vnm, sw_if_index, &addr);
2102 increment_ip4_and_mac_address (&addr);
2107 return clib_error_return (0, "unknown input `%U'",
2108 format_unformat_error, input);
2116 * Add or delete IPv4 ARP cache entries.
2118 * @note 'set ip arp' options (e.g. delete, static, 'fib-id <id>',
2119 * 'count <number>', 'interface ip4_addr mac_addr') can be added in
2120 * any order and combination.
2124 * Add or delete IPv4 ARP cache entries as follows. MAC Address can be in
2125 * either aa:bb:cc:dd:ee:ff format or aabb.ccdd.eeff format.
2126 * @cliexcmd{set ip arp GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2127 * @cliexcmd{set ip arp delete GigabitEthernet2/0/0 6.0.0.3 de:ad:be:ef:ba:be}
2129 * To add or delete an IPv4 ARP cache entry to or from a specific fib
2131 * @cliexcmd{set ip arp fib-id 1 GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2132 * @cliexcmd{set ip arp fib-id 1 delete GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2134 * Add or delete IPv4 static ARP cache entries as follows:
2135 * @cliexcmd{set ip arp static GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2136 * @cliexcmd{set ip arp static delete GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2138 * For testing / debugging purposes, the 'set ip arp' command can add or
2139 * delete multiple entries. Supply the 'count N' parameter:
2140 * @cliexcmd{set ip arp count 10 GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2143 VLIB_CLI_COMMAND (ip_arp_add_del_command, static) = {
2144 .path = "set ip arp",
2146 "set ip arp [del] <intfc> <ip-address> <mac-address> [static] [no-fib-entry] [count <count>] [fib-id <fib-id>] [proxy <lo-addr> - <hi-addr>]",
2147 .function = ip_arp_add_del_command_fn,
2151 static clib_error_t *
2152 set_int_proxy_arp_command_fn (vlib_main_t * vm,
2154 input, vlib_cli_command_t * cmd)
2156 vnet_main_t *vnm = vnet_get_main ();
2158 vnet_sw_interface_t *si;
2162 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2164 if (unformat (input, "%U", unformat_vnet_sw_interface,
2167 else if (unformat (input, "enable") || unformat (input, "on"))
2169 else if (unformat (input, "disable") || unformat (input, "off"))
2176 return clib_error_return (0, "unknown input '%U'",
2177 format_unformat_error, input);
2179 si = vnet_get_sw_interface (vnm, sw_if_index);
2182 si->flags |= VNET_SW_INTERFACE_FLAG_PROXY_ARP;
2184 si->flags &= ~VNET_SW_INTERFACE_FLAG_PROXY_ARP;
2191 * Enable proxy-arp on an interface. The vpp stack will answer ARP
2192 * requests for the indicated address range. Multiple proxy-arp
2193 * ranges may be provisioned.
2195 * @note Proxy ARP as a technology is infamous for blackholing traffic.
2196 * Also, the underlying implementation has not been performance-tuned.
2197 * Avoid creating an unnecessarily large set of ranges.
2200 * To enable proxy arp on a range of addresses, use:
2201 * @cliexcmd{set ip arp proxy 6.0.0.1 - 6.0.0.11}
2202 * Append 'del' to delete a range of proxy ARP addresses:
2203 * @cliexcmd{set ip arp proxy 6.0.0.1 - 6.0.0.11 del}
2204 * You must then specifically enable proxy arp on individual interfaces:
2205 * @cliexcmd{set interface proxy-arp GigabitEthernet0/8/0 enable}
2206 * To disable proxy arp on an individual interface:
2207 * @cliexcmd{set interface proxy-arp GigabitEthernet0/8/0 disable}
2209 VLIB_CLI_COMMAND (set_int_proxy_enable_command, static) = {
2210 .path = "set interface proxy-arp",
2212 "set interface proxy-arp <intfc> [enable|disable]",
2213 .function = set_int_proxy_arp_command_fn,
2219 * ARP/ND Termination in a L2 Bridge Domain based on IP4/IP6 to MAC
2220 * hash tables mac_by_ip4 and mac_by_ip6 for each BD.
2224 ARP_TERM_NEXT_L2_OUTPUT,
2229 u32 arp_term_next_node_index[32];
2232 arp_term_l2bd (vlib_main_t * vm,
2233 vlib_node_runtime_t * node, vlib_frame_t * frame)
2235 l2input_main_t *l2im = &l2input_main;
2236 u32 n_left_from, next_index, *from, *to_next;
2237 u32 n_replies_sent = 0;
2238 u16 last_bd_index = ~0;
2239 l2_bridge_domain_t *last_bd_config = 0;
2240 l2_input_config_t *cfg0;
2242 from = vlib_frame_vector_args (frame);
2243 n_left_from = frame->n_vectors;
2244 next_index = node->cached_next_index;
2246 while (n_left_from > 0)
2250 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2252 while (n_left_from > 0 && n_left_to_next > 0)
2255 ethernet_header_t *eth0;
2256 ethernet_arp_header_t *arp0;
2259 u32 pi0, error0, next0, sw_if_index0;
2271 n_left_to_next -= 1;
2273 p0 = vlib_get_buffer (vm, pi0);
2274 // Terminate only local (SHG == 0) ARP
2275 if (vnet_buffer (p0)->l2.shg != 0)
2276 goto next_l2_feature;
2278 eth0 = vlib_buffer_get_current (p0);
2279 l3h0 = (u8 *) eth0 + vnet_buffer (p0)->l2.l2_len;
2280 ethertype0 = clib_net_to_host_u16 (*(u16 *) (l3h0 - 2));
2281 arp0 = (ethernet_arp_header_t *) l3h0;
2283 if (PREDICT_FALSE ((ethertype0 != ETHERNET_TYPE_ARP) ||
2285 clib_host_to_net_u16
2286 (ETHERNET_ARP_OPCODE_request))))
2289 /* Must be ARP request packet here */
2290 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) &&
2291 (p0->flags & VLIB_BUFFER_IS_TRACED)))
2293 u8 *t0 = vlib_add_trace (vm, node, p0,
2294 sizeof (ethernet_arp_input_trace_t));
2295 clib_memcpy (t0, l3h0, sizeof (ethernet_arp_input_trace_t));
2298 error0 = ETHERNET_ARP_ERROR_replies_sent;
2301 clib_net_to_host_u16 (ETHERNET_ARP_HARDWARE_TYPE_ethernet)
2302 ? ETHERNET_ARP_ERROR_l2_type_not_ethernet : error0);
2305 clib_net_to_host_u16 (ETHERNET_TYPE_IP4) ?
2306 ETHERNET_ARP_ERROR_l3_type_not_ip4 : error0);
2308 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
2315 clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply))
2318 (arp0->ip4_over_ethernet[0].ethernet, vrrp_prefix,
2319 sizeof (vrrp_prefix))));
2321 /* Trash ARP packets whose ARP-level source addresses do not
2322 match their L2-frame-level source addresses, unless it's
2323 a reply from a VRRP virtual router */
2325 (memcmp (eth0->src_address, arp0->ip4_over_ethernet[0].ethernet,
2326 sizeof (eth0->src_address)) && !is_vrrp_reply0))
2328 error0 = ETHERNET_ARP_ERROR_l2_address_mismatch;
2332 /* Check if anyone want ARP request events for L2 BDs */
2334 ethernet_arp_main_t *am = ðernet_arp_main;
2335 if (am->wc_ip4_arp_publisher_node != (uword) ~ 0)
2336 vnet_arp_wc_publish (sw_if_index0, &arp0->ip4_over_ethernet[0]);
2339 /* lookup BD mac_by_ip4 hash table for MAC entry */
2340 ip0 = arp0->ip4_over_ethernet[1].ip4.as_u32;
2341 bd_index0 = vnet_buffer (p0)->l2.bd_index;
2342 if (PREDICT_FALSE ((bd_index0 != last_bd_index)
2343 || (last_bd_index == (u16) ~ 0)))
2345 last_bd_index = bd_index0;
2346 last_bd_config = vec_elt_at_index (l2im->bd_configs, bd_index0);
2348 macp0 = (u8 *) hash_get (last_bd_config->mac_by_ip4, ip0);
2350 if (PREDICT_FALSE (!macp0))
2351 goto next_l2_feature; /* MAC not found */
2353 /* MAC found, send ARP reply -
2354 Convert ARP request packet to ARP reply */
2355 arp0->opcode = clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply);
2356 arp0->ip4_over_ethernet[1] = arp0->ip4_over_ethernet[0];
2357 arp0->ip4_over_ethernet[0].ip4.as_u32 = ip0;
2358 clib_memcpy (arp0->ip4_over_ethernet[0].ethernet, macp0, 6);
2359 clib_memcpy (eth0->dst_address, eth0->src_address, 6);
2360 clib_memcpy (eth0->src_address, macp0, 6);
2361 n_replies_sent += 1;
2364 /* For BVI, need to use l2-fwd node to send ARP reply as
2365 l2-output node cannot output packet to BVI properly */
2366 cfg0 = vec_elt_at_index (l2im->configs, sw_if_index0);
2367 if (PREDICT_FALSE (cfg0->bvi))
2369 vnet_buffer (p0)->l2.feature_bitmap |= L2INPUT_FEAT_FWD;
2370 vnet_buffer (p0)->sw_if_index[VLIB_RX] = 0;
2371 goto next_l2_feature;
2374 /* Send ARP/ND reply back out input interface through l2-output */
2375 vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
2376 next0 = ARP_TERM_NEXT_L2_OUTPUT;
2377 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2378 to_next, n_left_to_next, pi0,
2383 /* IP6 ND event notification or solicitation handling to generate
2384 local response instead of flooding */
2385 iph0 = (ip6_header_t *) l3h0;
2386 if (PREDICT_FALSE (ethertype0 == ETHERNET_TYPE_IP6 &&
2387 iph0->protocol == IP_PROTOCOL_ICMP6 &&
2388 !ip6_address_is_unspecified
2389 (&iph0->src_address)))
2391 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
2392 if (vnet_ip6_nd_term
2393 (vm, node, p0, eth0, iph0, sw_if_index0,
2394 vnet_buffer (p0)->l2.bd_index))
2395 goto output_response;
2400 next0 = vnet_l2_feature_next (p0, arp_term_next_node_index,
2401 L2INPUT_FEAT_ARP_TERM);
2402 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2403 to_next, n_left_to_next,
2409 if (0 == arp0->ip4_over_ethernet[0].ip4.as_u32 ||
2410 (arp0->ip4_over_ethernet[0].ip4.as_u32 ==
2411 arp0->ip4_over_ethernet[1].ip4.as_u32))
2413 error0 = ETHERNET_ARP_ERROR_gratuitous_arp;
2415 next0 = ARP_TERM_NEXT_DROP;
2416 p0->error = node->errors[error0];
2418 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2419 to_next, n_left_to_next, pi0,
2423 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2426 vlib_error_count (vm, node->node_index,
2427 ETHERNET_ARP_ERROR_replies_sent, n_replies_sent);
2428 return frame->n_vectors;
2432 VLIB_REGISTER_NODE (arp_term_l2bd_node, static) = {
2433 .function = arp_term_l2bd,
2434 .name = "arp-term-l2bd",
2435 .vector_size = sizeof (u32),
2436 .n_errors = ETHERNET_ARP_N_ERROR,
2437 .error_strings = ethernet_arp_error_strings,
2438 .n_next_nodes = ARP_TERM_N_NEXT,
2440 [ARP_TERM_NEXT_L2_OUTPUT] = "l2-output",
2441 [ARP_TERM_NEXT_DROP] = "error-drop",
2443 .format_buffer = format_ethernet_arp_header,
2444 .format_trace = format_arp_term_input_trace,
2449 arp_term_init (vlib_main_t * vm)
2451 // Initialize the feature next-node indexes
2452 feat_bitmap_init_next_nodes (vm,
2453 arp_term_l2bd_node.index,
2455 l2input_get_feat_names (),
2456 arp_term_next_node_index);
2460 VLIB_INIT_FUNCTION (arp_term_init);
2463 change_arp_mac (u32 sw_if_index, ethernet_arp_ip4_entry_t * e)
2465 if (e->sw_if_index == sw_if_index)
2467 adj_nbr_walk_nh4 (e->sw_if_index,
2468 &e->ip4_address, arp_mk_complete_walk, e);
2473 ethernet_arp_change_mac (u32 sw_if_index)
2475 ethernet_arp_main_t *am = ðernet_arp_main;
2476 ethernet_arp_ip4_entry_t *e;
2479 pool_foreach (e, am->ip4_entry_pool,
2481 change_arp_mac (sw_if_index, e);
2487 send_ip4_garp (vlib_main_t * vm, vnet_hw_interface_t * hi)
2489 ip4_main_t *i4m = &ip4_main;
2490 u32 sw_if_index = hi->sw_if_index;
2491 ip4_address_t *ip4_addr = ip4_interface_first_address (i4m, sw_if_index, 0);
2495 clib_warning ("Sending GARP for IP4 address %U on sw_if_idex %d",
2496 format_ip4_address, ip4_addr, sw_if_index);
2498 /* Form GARP packet for output - Gratuitous ARP is an ARP request packet
2499 where the interface IP/MAC pair is used for both source and request
2500 MAC/IP pairs in the request */
2502 ethernet_arp_header_t *h = vlib_packet_template_get_packet
2503 (vm, &i4m->ip4_arp_request_packet_template, &bi);
2504 clib_memcpy (h->ip4_over_ethernet[0].ethernet, hi->hw_address,
2505 sizeof (h->ip4_over_ethernet[0].ethernet));
2506 clib_memcpy (h->ip4_over_ethernet[1].ethernet, hi->hw_address,
2507 sizeof (h->ip4_over_ethernet[1].ethernet));
2508 h->ip4_over_ethernet[0].ip4 = ip4_addr[0];
2509 h->ip4_over_ethernet[1].ip4 = ip4_addr[0];
2511 /* Setup MAC header with ARP Etype and broadcast DMAC */
2512 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
2513 vlib_buffer_advance (b, -sizeof (ethernet_header_t));
2514 ethernet_header_t *e = vlib_buffer_get_current (b);
2515 e->type = clib_host_to_net_u16 (ETHERNET_TYPE_ARP);
2516 clib_memcpy (e->src_address, hi->hw_address, sizeof (e->src_address));
2517 memset (e->dst_address, 0xff, sizeof (e->dst_address));
2519 /* Send GARP packet out the specified interface */
2520 vnet_buffer (b)->sw_if_index[VLIB_RX] =
2521 vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index;
2522 vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index);
2523 u32 *to_next = vlib_frame_vector_args (f);
2526 vlib_put_frame_to_node (vm, hi->output_node_index, f);
2531 * fd.io coding-style-patch-verification: ON
2534 * eval: (c-set-style "gnu")