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 } ethernet_arp_main_t;
99 static ethernet_arp_main_t ethernet_arp_main;
104 ethernet_arp_ip4_over_ethernet_address_t a;
108 #define ETHERNET_ARP_ARGS_REMOVE (1<<0)
109 #define ETHERNET_ARP_ARGS_FLUSH (1<<1)
110 #define ETHERNET_ARP_ARGS_POPULATE (1<<2)
111 #define ETHERNET_ARP_ARGS_WC_PUB (1<<3)
112 } vnet_arp_set_ip4_over_ethernet_rpc_args_t;
114 static const u8 vrrp_prefix[] = { 0x00, 0x00, 0x5E, 0x00, 0x01 };
116 /* Node index for send_garp_na_process */
117 u32 send_garp_na_process_node_index;
120 set_ip4_over_ethernet_rpc_callback (vnet_arp_set_ip4_over_ethernet_rpc_args_t
124 format_ethernet_arp_hardware_type (u8 * s, va_list * va)
126 ethernet_arp_hardware_type_t h = va_arg (*va, ethernet_arp_hardware_type_t);
130 #define _(n,f) case n: t = #f; break;
131 foreach_ethernet_arp_hardware_type;
135 return format (s, "unknown 0x%x", h);
138 return format (s, "%s", t);
142 format_ethernet_arp_opcode (u8 * s, va_list * va)
144 ethernet_arp_opcode_t o = va_arg (*va, ethernet_arp_opcode_t);
148 #define _(f) case ETHERNET_ARP_OPCODE_##f: t = #f; break;
149 foreach_ethernet_arp_opcode;
153 return format (s, "unknown 0x%x", o);
156 return format (s, "%s", t);
160 unformat_ethernet_arp_opcode_host_byte_order (unformat_input_t * input,
163 int *result = va_arg (*args, int *);
164 ethernet_arp_main_t *am = ðernet_arp_main;
167 /* Numeric opcode. */
168 if (unformat (input, "0x%x", &x) || unformat (input, "%d", &x))
177 if (unformat_user (input, unformat_vlib_number_by_name,
178 am->opcode_by_name, &i))
188 unformat_ethernet_arp_opcode_net_byte_order (unformat_input_t * input,
191 int *result = va_arg (*args, int *);
193 (input, unformat_ethernet_arp_opcode_host_byte_order, result))
196 *result = clib_host_to_net_u16 ((u16) * result);
201 format_ethernet_arp_header (u8 * s, va_list * va)
203 ethernet_arp_header_t *a = va_arg (*va, ethernet_arp_header_t *);
204 u32 max_header_bytes = va_arg (*va, u32);
206 u16 l2_type, l3_type;
208 if (max_header_bytes != 0 && sizeof (a[0]) > max_header_bytes)
209 return format (s, "ARP header truncated");
211 l2_type = clib_net_to_host_u16 (a->l2_type);
212 l3_type = clib_net_to_host_u16 (a->l3_type);
214 indent = format_get_indent (s);
216 s = format (s, "%U, type %U/%U, address size %d/%d",
217 format_ethernet_arp_opcode, clib_net_to_host_u16 (a->opcode),
218 format_ethernet_arp_hardware_type, l2_type,
219 format_ethernet_type, l3_type,
220 a->n_l2_address_bytes, a->n_l3_address_bytes);
222 if (l2_type == ETHERNET_ARP_HARDWARE_TYPE_ethernet
223 && l3_type == ETHERNET_TYPE_IP4)
225 s = format (s, "\n%U%U/%U -> %U/%U",
226 format_white_space, indent,
227 format_ethernet_address, a->ip4_over_ethernet[0].ethernet,
228 format_ip4_address, &a->ip4_over_ethernet[0].ip4,
229 format_ethernet_address, a->ip4_over_ethernet[1].ethernet,
230 format_ip4_address, &a->ip4_over_ethernet[1].ip4);
234 uword n2 = a->n_l2_address_bytes;
235 uword n3 = a->n_l3_address_bytes;
236 s = format (s, "\n%U%U/%U -> %U/%U",
237 format_white_space, indent,
238 format_hex_bytes, a->data + 0 * n2 + 0 * n3, n2,
239 format_hex_bytes, a->data + 1 * n2 + 0 * n3, n3,
240 format_hex_bytes, a->data + 1 * n2 + 1 * n3, n2,
241 format_hex_bytes, a->data + 2 * n2 + 1 * n3, n3);
248 format_ethernet_arp_ip4_entry (u8 * s, va_list * va)
250 vnet_main_t *vnm = va_arg (*va, vnet_main_t *);
251 ethernet_arp_ip4_entry_t *e = va_arg (*va, ethernet_arp_ip4_entry_t *);
252 vnet_sw_interface_t *si;
256 return format (s, "%=12s%=16s%=6s%=20s%=24s", "Time", "IP4",
257 "Flags", "Ethernet", "Interface");
259 si = vnet_get_sw_interface (vnm, e->sw_if_index);
261 if (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC)
262 flags = format (flags, "S");
264 if (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_DYNAMIC)
265 flags = format (flags, "D");
267 if (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_NO_FIB_ENTRY)
268 flags = format (flags, "N");
270 s = format (s, "%=12U%=16U%=6s%=20U%U",
271 format_vlib_cpu_time, vnm->vlib_main, e->cpu_time_last_updated,
272 format_ip4_address, &e->ip4_address,
273 flags ? (char *) flags : "",
274 format_ethernet_address, e->ethernet_address,
275 format_vnet_sw_interface_name, vnm, si);
284 } ethernet_arp_input_trace_t;
287 format_ethernet_arp_input_trace (u8 * s, va_list * va)
289 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
290 CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
291 ethernet_arp_input_trace_t *t = va_arg (*va, ethernet_arp_input_trace_t *);
294 format_ethernet_arp_header,
295 t->packet_data, sizeof (t->packet_data));
301 format_arp_term_input_trace (u8 * s, va_list * va)
303 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
304 CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
305 ethernet_arp_input_trace_t *t = va_arg (*va, ethernet_arp_input_trace_t *);
307 /* arp-term trace data saved is either arp or ip6/icmp6 packet:
308 - for arp, the 1st 16-bit field is hw type of value of 0x0001.
309 - for ip6, the first nibble has value of 6. */
310 s = format (s, "%U", t->packet_data[0] == 0 ?
311 format_ethernet_arp_header : format_ip6_header,
312 t->packet_data, sizeof (t->packet_data));
318 arp_nbr_probe (ip_adjacency_t * adj)
320 vnet_main_t *vnm = vnet_get_main ();
321 ip4_main_t *im = &ip4_main;
322 ip_interface_address_t *ia;
323 ethernet_arp_header_t *h;
324 vnet_hw_interface_t *hi;
325 vnet_sw_interface_t *si;
331 vm = vlib_get_main ();
333 si = vnet_get_sw_interface (vnm, adj->rewrite_header.sw_if_index);
335 if (!(si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
341 ip4_interface_address_matching_destination (im,
342 &adj->sub_type.nbr.next_hop.
352 vlib_packet_template_get_packet (vm, &im->ip4_arp_request_packet_template,
355 hi = vnet_get_sup_hw_interface (vnm, adj->rewrite_header.sw_if_index);
357 clib_memcpy (h->ip4_over_ethernet[0].ethernet,
358 hi->hw_address, sizeof (h->ip4_over_ethernet[0].ethernet));
360 h->ip4_over_ethernet[0].ip4 = src[0];
361 h->ip4_over_ethernet[1].ip4 = adj->sub_type.nbr.next_hop.ip4;
363 b = vlib_get_buffer (vm, bi);
364 vnet_buffer (b)->sw_if_index[VLIB_RX] =
365 vnet_buffer (b)->sw_if_index[VLIB_TX] = adj->rewrite_header.sw_if_index;
367 /* Add encapsulation string for software interface (e.g. ethernet header). */
368 vnet_rewrite_one_header (adj[0], h, sizeof (ethernet_header_t));
369 vlib_buffer_advance (b, -adj->rewrite_header.data_bytes);
372 vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index);
373 u32 *to_next = vlib_frame_vector_args (f);
376 vlib_put_frame_to_node (vm, hi->output_node_index, f);
381 arp_mk_complete (adj_index_t ai, ethernet_arp_ip4_entry_t * e)
383 adj_nbr_update_rewrite
384 (ai, ADJ_NBR_REWRITE_FLAG_COMPLETE,
385 ethernet_build_rewrite (vnet_get_main (),
387 adj_get_link_type (ai), e->ethernet_address));
391 arp_mk_incomplete (adj_index_t ai)
393 ip_adjacency_t *adj = adj_get (ai);
395 adj_nbr_update_rewrite
397 ADJ_NBR_REWRITE_FLAG_INCOMPLETE,
398 ethernet_build_rewrite (vnet_get_main (),
399 adj->rewrite_header.sw_if_index,
401 VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST));
404 static ethernet_arp_ip4_entry_t *
405 arp_entry_find (ethernet_arp_interface_t * eai, const ip4_address_t * addr)
407 ethernet_arp_main_t *am = ðernet_arp_main;
408 ethernet_arp_ip4_entry_t *e = NULL;
411 if (NULL != eai->arp_entries)
413 p = hash_get (eai->arp_entries, addr->as_u32);
417 e = pool_elt_at_index (am->ip4_entry_pool, p[0]);
424 arp_mk_complete_walk (adj_index_t ai, void *ctx)
426 ethernet_arp_ip4_entry_t *e = ctx;
428 arp_mk_complete (ai, e);
430 return (ADJ_WALK_RC_CONTINUE);
434 arp_mk_incomplete_walk (adj_index_t ai, void *ctx)
436 arp_mk_incomplete (ai);
438 return (ADJ_WALK_RC_CONTINUE);
442 arp_update_adjacency (vnet_main_t * vnm, u32 sw_if_index, u32 ai)
444 ethernet_arp_main_t *am = ðernet_arp_main;
445 ethernet_arp_interface_t *arp_int;
446 ethernet_arp_ip4_entry_t *e;
451 vec_validate (am->ethernet_arp_by_sw_if_index, sw_if_index);
452 arp_int = &am->ethernet_arp_by_sw_if_index[sw_if_index];
453 e = arp_entry_find (arp_int, &adj->sub_type.nbr.next_hop.ip4);
455 switch (adj->lookup_next_index)
457 case IP_LOOKUP_NEXT_ARP:
458 case IP_LOOKUP_NEXT_GLEAN:
461 adj_nbr_walk_nh4 (sw_if_index,
462 &e->ip4_address, arp_mk_complete_walk, e);
467 * no matching ARP entry.
468 * construct the rewrite required to for an ARP packet, and stick
469 * that in the adj's pipe to smoke.
471 adj_nbr_update_rewrite
473 ADJ_NBR_REWRITE_FLAG_INCOMPLETE,
474 ethernet_build_rewrite
478 VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST));
481 * since the FIB has added this adj for a route, it makes sense it
482 * may want to forward traffic sometime soon. Let's send a
483 * speculative ARP. just one. If we were to do periodically that
484 * wouldn't be bad either, but that's more code than i'm prepared to
485 * write at this time for relatively little reward.
490 case IP_LOOKUP_NEXT_MCAST:
493 * Construct a partial rewrite from the known ethernet mcast dest MAC
498 rewrite = ethernet_build_rewrite (vnm,
501 ethernet_ip4_mcast_dst_addr ());
502 offset = vec_len (rewrite) - 2;
505 * Complete the remaining fields of the adj's rewrite to direct the
506 * complete of the rewrite at switch time by copying in the IP
507 * dst address's bytes.
508 * Ofset is 2 bytes into the MAC desintation address. And we copy 23 bits
511 adj_mcast_update_rewrite (ai, rewrite, offset, 0x007fffff);
515 case IP_LOOKUP_NEXT_DROP:
516 case IP_LOOKUP_NEXT_PUNT:
517 case IP_LOOKUP_NEXT_LOCAL:
518 case IP_LOOKUP_NEXT_REWRITE:
519 case IP_LOOKUP_NEXT_MCAST_MIDCHAIN:
520 case IP_LOOKUP_NEXT_MIDCHAIN:
521 case IP_LOOKUP_NEXT_ICMP_ERROR:
522 case IP_LOOKUP_N_NEXT:
529 arp_adj_fib_add (ethernet_arp_ip4_entry_t * e, u32 fib_index)
533 .fp_proto = FIB_PROTOCOL_IP4,
534 .fp_addr.ip4 = e->ip4_address,
538 fib_table_entry_path_add (fib_index, &pfx, FIB_SOURCE_ADJ,
539 FIB_ENTRY_FLAG_ATTACHED,
540 DPO_PROTO_IP4, &pfx.fp_addr,
541 e->sw_if_index, ~0, 1, NULL,
542 FIB_ROUTE_PATH_FLAG_NONE);
543 fib_table_lock (fib_index, FIB_PROTOCOL_IP4, FIB_SOURCE_ADJ);
547 vnet_arp_set_ip4_over_ethernet_internal (vnet_main_t * vnm,
548 vnet_arp_set_ip4_over_ethernet_rpc_args_t
551 ethernet_arp_ip4_entry_t *e = 0;
552 ethernet_arp_main_t *am = ðernet_arp_main;
553 ethernet_arp_ip4_over_ethernet_address_t *a = &args->a;
554 vlib_main_t *vm = vlib_get_main ();
555 int make_new_arp_cache_entry = 1;
557 pending_resolution_t *pr, *mc;
558 ethernet_arp_interface_t *arp_int;
559 int is_static = args->is_static;
560 u32 sw_if_index = args->sw_if_index;
561 int is_no_fib_entry = args->is_no_fib_entry;
563 vec_validate (am->ethernet_arp_by_sw_if_index, sw_if_index);
565 arp_int = &am->ethernet_arp_by_sw_if_index[sw_if_index];
567 if (NULL != arp_int->arp_entries)
569 p = hash_get (arp_int->arp_entries, a->ip4.as_u32);
572 e = pool_elt_at_index (am->ip4_entry_pool, p[0]);
574 /* Refuse to over-write static arp. */
575 if (!is_static && (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC))
577 make_new_arp_cache_entry = 0;
581 if (make_new_arp_cache_entry)
583 pool_get (am->ip4_entry_pool, e);
585 if (NULL == arp_int->arp_entries)
587 arp_int->arp_entries = hash_create (0, sizeof (u32));
590 hash_set (arp_int->arp_entries, a->ip4.as_u32, e - am->ip4_entry_pool);
592 e->sw_if_index = sw_if_index;
593 e->ip4_address = a->ip4;
594 e->fib_entry_index = FIB_NODE_INDEX_INVALID;
595 clib_memcpy (e->ethernet_address,
596 a->ethernet, sizeof (e->ethernet_address));
598 if (!is_no_fib_entry)
601 ip4_fib_table_get_index_for_sw_if_index
606 e->flags |= ETHERNET_ARP_IP4_ENTRY_FLAG_NO_FIB_ENTRY;
612 * prevent a DoS attack from the data-plane that
613 * spams us with no-op updates to the MAC address
615 if (0 == memcmp (e->ethernet_address,
616 a->ethernet, sizeof (e->ethernet_address)))
619 /* Update time stamp and ethernet address. */
620 clib_memcpy (e->ethernet_address, a->ethernet,
621 sizeof (e->ethernet_address));
624 e->cpu_time_last_updated = clib_cpu_time_now ();
626 e->flags |= ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC;
628 e->flags |= ETHERNET_ARP_IP4_ENTRY_FLAG_DYNAMIC;
630 adj_nbr_walk_nh4 (sw_if_index, &e->ip4_address, arp_mk_complete_walk, e);
632 /* Customer(s) waiting for this address to be resolved? */
633 p = hash_get (am->pending_resolutions_by_address, a->ip4.as_u32);
639 while (next_index != (u32) ~ 0)
641 pr = pool_elt_at_index (am->pending_resolutions, next_index);
642 vlib_process_signal_event (vm, pr->node_index,
643 pr->type_opaque, pr->data);
644 next_index = pr->next_index;
645 pool_put (am->pending_resolutions, pr);
648 hash_unset (am->pending_resolutions_by_address, a->ip4.as_u32);
651 /* Customer(s) requesting ARP event for this address? */
652 p = hash_get (am->mac_changes_by_address, a->ip4.as_u32);
658 while (next_index != (u32) ~ 0)
660 int (*fp) (u32, u8 *, u32, u32);
662 mc = pool_elt_at_index (am->mac_changes, next_index);
663 fp = mc->data_callback;
665 /* Call the user's data callback, return 1 to suppress dup events */
667 rv = (*fp) (mc->data, a->ethernet, sw_if_index, 0);
670 * Signal the resolver process, as long as the user
671 * says they want to be notified
674 vlib_process_signal_event (vm, mc->node_index,
675 mc->type_opaque, mc->data);
676 next_index = mc->next_index;
684 vnet_register_ip4_arp_resolution_event (vnet_main_t * vnm,
687 uword type_opaque, uword data)
689 ethernet_arp_main_t *am = ðernet_arp_main;
690 ip4_address_t *address = address_arg;
692 pending_resolution_t *pr;
694 pool_get (am->pending_resolutions, pr);
697 pr->node_index = node_index;
698 pr->type_opaque = type_opaque;
700 pr->data_callback = 0;
702 p = hash_get (am->pending_resolutions_by_address, address->as_u32);
705 /* Insert new resolution at the head of the list */
706 pr->next_index = p[0];
707 hash_unset (am->pending_resolutions_by_address, address->as_u32);
710 hash_set (am->pending_resolutions_by_address, address->as_u32,
711 pr - am->pending_resolutions);
715 vnet_add_del_ip4_arp_change_event (vnet_main_t * vnm,
720 uword type_opaque, uword data, int is_add)
722 ethernet_arp_main_t *am = ðernet_arp_main;
723 ip4_address_t *address = address_arg;
725 /* Try to find an existing entry */
726 u32 *first = (u32 *) hash_get (am->mac_changes_by_address, address->as_u32);
728 pending_resolution_t *mc;
729 while (p && *p != ~0)
731 mc = pool_elt_at_index (am->mac_changes, *p);
732 if (mc->node_index == node_index && mc->type_opaque == type_opaque
738 int found = p && *p != ~0;
742 return VNET_API_ERROR_ENTRY_ALREADY_EXISTS;
744 pool_get (am->mac_changes, mc);
745 *mc = (pending_resolution_t)
747 .next_index = ~0,.node_index = node_index,.type_opaque =
748 type_opaque,.data = data,.data_callback = data_callback,.pid =
751 /* Insert new resolution at the end of the list */
752 u32 new_idx = mc - am->mac_changes;
756 hash_set (am->mac_changes_by_address, address->as_u32, new_idx);
761 return VNET_API_ERROR_NO_SUCH_ENTRY;
763 /* Clients may need to clean up pool entries, too */
764 void (*fp) (u32, u8 *) = data_callback;
766 (*fp) (mc->data, 0 /* no new mac addrs */ );
768 /* Remove the entry from the list and delete the entry */
770 pool_put (am->mac_changes, mc);
772 /* Remove from hash if we deleted the last entry */
773 if (*p == ~0 && p == first)
774 hash_unset (am->mac_changes_by_address, address->as_u32);
779 /* Either we drop the packet or we send a reply to the sender. */
783 ARP_INPUT_NEXT_REPLY_TX,
787 #define foreach_ethernet_arp_error \
788 _ (replies_sent, "ARP replies sent") \
789 _ (l2_type_not_ethernet, "L2 type not ethernet") \
790 _ (l3_type_not_ip4, "L3 type not IP4") \
791 _ (l3_src_address_not_local, "IP4 source address not local to subnet") \
792 _ (l3_dst_address_not_local, "IP4 destination address not local to subnet") \
793 _ (l3_src_address_is_local, "IP4 source address matches local interface") \
794 _ (l3_src_address_learned, "ARP request IP4 source address learned") \
795 _ (replies_received, "ARP replies received") \
796 _ (opcode_not_request, "ARP opcode not request") \
797 _ (proxy_arp_replies_sent, "Proxy ARP replies sent") \
798 _ (l2_address_mismatch, "ARP hw addr does not match L2 frame src addr") \
799 _ (gratuitous_arp, "ARP probe or announcement dropped") \
800 _ (interface_no_table, "Interface is not mapped to an IP table") \
801 _ (interface_not_ip_enabled, "Interface is not IP enabled") \
805 #define _(sym,string) ETHERNET_ARP_ERROR_##sym,
806 foreach_ethernet_arp_error
808 ETHERNET_ARP_N_ERROR,
809 } ethernet_arp_input_error_t;
813 unset_random_arp_entry (void)
815 ethernet_arp_main_t *am = ðernet_arp_main;
816 ethernet_arp_ip4_entry_t *e;
817 vnet_main_t *vnm = vnet_get_main ();
818 ethernet_arp_ip4_over_ethernet_address_t delme;
821 index = pool_next_index (am->ip4_entry_pool, am->arp_delete_rotor);
822 am->arp_delete_rotor = index;
824 /* Try again from elt 0, could happen if an intfc goes down */
827 index = pool_next_index (am->ip4_entry_pool, am->arp_delete_rotor);
828 am->arp_delete_rotor = index;
831 /* Nothing left in the pool */
835 e = pool_elt_at_index (am->ip4_entry_pool, index);
837 clib_memcpy (&delme.ethernet, e->ethernet_address, 6);
838 delme.ip4.as_u32 = e->ip4_address.as_u32;
840 vnet_arp_unset_ip4_over_ethernet (vnm, e->sw_if_index, &delme);
844 arp_unnumbered (vlib_buffer_t * p0,
845 u32 input_sw_if_index, u32 conn_sw_if_index)
847 vnet_main_t *vnm = vnet_get_main ();
848 vnet_interface_main_t *vim = &vnm->interface_main;
849 vnet_sw_interface_t *si;
851 /* verify that the input interface is unnumbered to the connected.
852 * the connected interface is the interface on which the subnet is
854 si = &vim->sw_interfaces[input_sw_if_index];
856 if (!(si->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED &&
857 (si->unnumbered_sw_if_index == conn_sw_if_index)))
859 /* the input interface is not unnumbered to the interface on which
860 * the sub-net is configured that covers the ARP request.
861 * So this is not the case for unnumbered.. */
869 arp_learn (vnet_main_t * vnm,
870 ethernet_arp_main_t * am, u32 sw_if_index, void *addr)
872 if (am->limit_arp_cache_size &&
873 pool_elts (am->ip4_entry_pool) >= am->limit_arp_cache_size)
874 unset_random_arp_entry ();
876 vnet_arp_set_ip4_over_ethernet (vnm, sw_if_index, addr, 0, 0);
877 return (ETHERNET_ARP_ERROR_l3_src_address_learned);
881 arp_input (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
883 ethernet_arp_main_t *am = ðernet_arp_main;
884 vnet_main_t *vnm = vnet_get_main ();
885 ip4_main_t *im4 = &ip4_main;
886 u32 n_left_from, next_index, *from, *to_next;
887 u32 n_replies_sent = 0, n_proxy_arp_replies_sent = 0;
889 from = vlib_frame_vector_args (frame);
890 n_left_from = frame->n_vectors;
891 next_index = node->cached_next_index;
893 if (node->flags & VLIB_NODE_FLAG_TRACE)
894 vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
896 sizeof (ethernet_arp_input_trace_t));
898 while (n_left_from > 0)
902 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
904 while (n_left_from > 0 && n_left_to_next > 0)
907 vnet_hw_interface_t *hw_if0;
908 ethernet_arp_header_t *arp0;
909 ethernet_header_t *eth_rx, *eth_tx;
910 ip4_address_t *if_addr0, proxy_src;
911 u32 pi0, error0, next0, sw_if_index0, conn_sw_if_index0, fib_index0;
912 u8 is_request0, dst_is_local0, is_unnum0, is_vrrp_reply0;
913 ethernet_proxy_arp_t *pa;
914 fib_node_index_t dst_fei, src_fei;
916 fib_entry_flag_t src_flags, dst_flags;
917 u8 *rewrite0, rewrite0_len;
927 p0 = vlib_get_buffer (vm, pi0);
928 arp0 = vlib_buffer_get_current (p0);
929 /* Fill in ethernet header. */
930 eth_rx = ethernet_buffer_get_header (p0);
932 is_request0 = arp0->opcode
933 == clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_request);
935 error0 = ETHERNET_ARP_ERROR_replies_sent;
939 clib_net_to_host_u16 (ETHERNET_ARP_HARDWARE_TYPE_ethernet) ?
940 ETHERNET_ARP_ERROR_l2_type_not_ethernet : error0);
943 clib_net_to_host_u16 (ETHERNET_TYPE_IP4) ?
944 ETHERNET_ARP_ERROR_l3_type_not_ip4 : error0);
946 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
948 /* not playing the ARP game if the interface is not IPv4 enabled */
950 (im4->ip_enabled_by_sw_if_index[sw_if_index0] == 0 ?
951 ETHERNET_ARP_ERROR_interface_not_ip_enabled : error0);
956 /* Check that IP address is local and matches incoming interface. */
957 fib_index0 = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);
958 if (~0 == fib_index0)
960 error0 = ETHERNET_ARP_ERROR_interface_no_table;
964 dst_fei = ip4_fib_table_lookup (ip4_fib_get (fib_index0),
965 &arp0->ip4_over_ethernet[1].ip4,
967 dst_flags = fib_entry_get_flags (dst_fei);
969 conn_sw_if_index0 = fib_entry_get_resolving_interface (dst_fei);
971 /* Honor unnumbered interface, if any */
972 is_unnum0 = sw_if_index0 != conn_sw_if_index0;
976 * we're looking for FIB entries that indicate the source
977 * is attached. There may be more specific non-attached
978 * routes tht match the source, but these do not influence
979 * whether we respond to an ARP request, i.e. they do not
980 * influence whether we are the correct way for the sender
981 * to reach us, they only affect how we reach the sender.
983 fib_entry_t *src_fib_entry;
984 fib_entry_src_t *src;
995 src_fei = ip4_fib_table_lookup (ip4_fib_get (fib_index0),
997 ip4_over_ethernet[0].ip4,
999 src_fib_entry = fib_entry_get (src_fei);
1002 * It's possible that the source that provides the
1003 * flags we need, or the flags we must not have,
1004 * is not the best source, so check then all.
1007 FOR_EACH_SRC_ADDED(src_fib_entry, src, source,
1009 src_flags = fib_entry_get_flags_for_source (src_fei, source);
1011 /* Reject requests/replies with our local interface
1013 if (FIB_ENTRY_FLAG_LOCAL & src_flags)
1015 error0 = ETHERNET_ARP_ERROR_l3_src_address_is_local;
1017 * When VPP has an interface whose address is also
1018 * applied to a TAP interface on the host, then VPP's
1019 * TAP interface will be unnumbered to the 'real'
1020 * interface and do proxy ARP from the host.
1021 * The curious aspect of this setup is that ARP requests
1022 * from the host will come from the VPP's own address.
1023 * So don't drop immediately here, instead go see if this
1024 * is a proxy ARP case.
1028 /* A Source must also be local to subnet of matching
1029 * interface address. */
1030 if ((FIB_ENTRY_FLAG_ATTACHED & src_flags) ||
1031 (FIB_ENTRY_FLAG_CONNECTED & src_flags))
1038 * The packet was sent from an address that is not
1039 * connected nor attached i.e. it is not from an
1040 * address that is covered by a link's sub-net,
1041 * nor is it a already learned host resp.
1047 * shorter mask lookup for the next iteration.
1049 fib_entry_get_prefix (src_fei, &pfx);
1050 mask = pfx.fp_len - 1;
1053 * continue until we hit the default route or we find
1054 * the attached we are looking for. The most likely
1055 * outcome is we find the attached with the first source
1056 * on the first lookup.
1060 !fib_entry_is_sourced (src_fei, FIB_SOURCE_DEFAULT_ROUTE));
1065 * the matching route is a not attached, i.e. it was
1066 * added as a result of routing, rather than interface/ARP
1067 * configuration. If the matching route is not a host route
1070 error0 = ETHERNET_ARP_ERROR_l3_src_address_not_local;
1075 if (!(FIB_ENTRY_FLAG_CONNECTED & dst_flags))
1077 error0 = ETHERNET_ARP_ERROR_l3_dst_address_not_local;
1081 if (sw_if_index0 != fib_entry_get_resolving_interface (src_fei))
1084 * The interface the ARP was received on is not the interface
1085 * on which the covering prefix is configured. Maybe this is a
1086 * case for unnumbered.
1091 dst_is_local0 = (FIB_ENTRY_FLAG_LOCAL & dst_flags);
1092 fib_entry_get_prefix (dst_fei, &pfx0);
1093 if_addr0 = &pfx0.fp_addr.ip4;
1097 clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply))
1100 (arp0->ip4_over_ethernet[0].ethernet, vrrp_prefix,
1101 sizeof (vrrp_prefix))));
1103 /* Trash ARP packets whose ARP-level source addresses do not
1104 match their L2-frame-level source addresses, unless it's
1105 a reply from a VRRP virtual router */
1107 (eth_rx->src_address, arp0->ip4_over_ethernet[0].ethernet,
1108 sizeof (eth_rx->src_address)) && !is_vrrp_reply0)
1110 error0 = ETHERNET_ARP_ERROR_l2_address_mismatch;
1114 /* Learn or update sender's mapping only for replies to addresses
1115 * that are local to the subnet */
1117 clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply) &&
1120 error0 = arp_learn (vnm, am, sw_if_index0,
1121 &arp0->ip4_over_ethernet[0]);
1127 An adjacency to the sender is not always present,
1128 so we use the interface to build us a rewrite string
1129 which will contain all the necessary tags. */
1130 rewrite0 = ethernet_build_rewrite (vnm, sw_if_index0,
1132 eth_rx->src_address);
1133 rewrite0_len = vec_len (rewrite0);
1135 /* Figure out how much to rewind current data from adjacency. */
1136 vlib_buffer_advance (p0, -rewrite0_len);
1137 eth_tx = vlib_buffer_get_current (p0);
1139 vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
1140 hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
1142 /* Send reply back through input interface */
1143 vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
1144 next0 = ARP_INPUT_NEXT_REPLY_TX;
1146 arp0->opcode = clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply);
1148 arp0->ip4_over_ethernet[1] = arp0->ip4_over_ethernet[0];
1150 clib_memcpy (arp0->ip4_over_ethernet[0].ethernet,
1151 hw_if0->hw_address, 6);
1152 clib_mem_unaligned (&arp0->ip4_over_ethernet[0].ip4.data_u32, u32) =
1155 /* Hardware must be ethernet-like. */
1156 ASSERT (vec_len (hw_if0->hw_address) == 6);
1158 /* the rx nd tx ethernet headers wil overlap in the case
1159 * when we received a tagged VLAN=0 packet, but we are sending
1161 clib_memcpy (eth_tx, rewrite0, vec_len (rewrite0));
1162 vec_free (rewrite0);
1168 if (!arp_unnumbered (p0, sw_if_index0, conn_sw_if_index0))
1173 /* We are going to reply to this request, so, in the absence of
1174 errors, learn the sender */
1176 error0 = arp_learn (vnm, am, sw_if_index0,
1177 &arp0->ip4_over_ethernet[1]);
1179 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1180 n_left_to_next, pi0, next0);
1182 n_replies_sent += 1;
1186 if (0 == arp0->ip4_over_ethernet[0].ip4.as_u32 ||
1187 (arp0->ip4_over_ethernet[0].ip4.as_u32 ==
1188 arp0->ip4_over_ethernet[1].ip4.as_u32))
1190 error0 = ETHERNET_ARP_ERROR_gratuitous_arp;
1193 /* See if proxy arp is configured for the address */
1196 vnet_sw_interface_t *si;
1197 u32 this_addr = clib_net_to_host_u32
1198 (arp0->ip4_over_ethernet[1].ip4.as_u32);
1201 si = vnet_get_sw_interface (vnm, sw_if_index0);
1203 if (!(si->flags & VNET_SW_INTERFACE_FLAG_PROXY_ARP))
1206 fib_index0 = vec_elt (im4->fib_index_by_sw_if_index,
1209 vec_foreach (pa, am->proxy_arps)
1211 u32 lo_addr = clib_net_to_host_u32 (pa->lo_addr);
1212 u32 hi_addr = clib_net_to_host_u32 (pa->hi_addr);
1214 /* an ARP request hit in the proxy-arp table? */
1215 if ((this_addr >= lo_addr && this_addr <= hi_addr) &&
1216 (fib_index0 == pa->fib_index))
1219 arp0->ip4_over_ethernet[1].ip4.data_u32;
1222 * change the interface address to the proxied
1224 if_addr0 = &proxy_src;
1226 n_proxy_arp_replies_sent++;
1234 next0 = ARP_INPUT_NEXT_DROP;
1235 p0->error = node->errors[error0];
1237 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1238 n_left_to_next, pi0, next0);
1241 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1244 vlib_error_count (vm, node->node_index,
1245 ETHERNET_ARP_ERROR_replies_sent,
1246 n_replies_sent - n_proxy_arp_replies_sent);
1248 vlib_error_count (vm, node->node_index,
1249 ETHERNET_ARP_ERROR_proxy_arp_replies_sent,
1250 n_proxy_arp_replies_sent);
1251 return frame->n_vectors;
1254 static char *ethernet_arp_error_strings[] = {
1255 #define _(sym,string) string,
1256 foreach_ethernet_arp_error
1261 VLIB_REGISTER_NODE (arp_input_node, static) =
1263 .function = arp_input,
1264 .name = "arp-input",
1265 .vector_size = sizeof (u32),
1266 .n_errors = ETHERNET_ARP_N_ERROR,
1267 .error_strings = ethernet_arp_error_strings,
1268 .n_next_nodes = ARP_INPUT_N_NEXT,
1270 [ARP_INPUT_NEXT_DROP] = "error-drop",
1271 [ARP_INPUT_NEXT_REPLY_TX] = "interface-output",
1273 .format_buffer = format_ethernet_arp_header,
1274 .format_trace = format_ethernet_arp_input_trace,
1279 ip4_arp_entry_sort (void *a1, void *a2)
1281 ethernet_arp_ip4_entry_t *e1 = a1;
1282 ethernet_arp_ip4_entry_t *e2 = a2;
1285 vnet_main_t *vnm = vnet_get_main ();
1287 cmp = vnet_sw_interface_compare (vnm, e1->sw_if_index, e2->sw_if_index);
1289 cmp = ip4_address_compare (&e1->ip4_address, &e2->ip4_address);
1293 ethernet_arp_ip4_entry_t *
1294 ip4_neighbor_entries (u32 sw_if_index)
1296 ethernet_arp_main_t *am = ðernet_arp_main;
1297 ethernet_arp_ip4_entry_t *n, *ns = 0;
1300 pool_foreach (n, am->ip4_entry_pool, ({
1301 if (sw_if_index != ~0 && n->sw_if_index != sw_if_index)
1303 vec_add1 (ns, n[0]);
1308 vec_sort_with_function (ns, ip4_arp_entry_sort);
1312 static clib_error_t *
1313 show_ip4_arp (vlib_main_t * vm,
1314 unformat_input_t * input, vlib_cli_command_t * cmd)
1316 vnet_main_t *vnm = vnet_get_main ();
1317 ethernet_arp_main_t *am = ðernet_arp_main;
1318 ethernet_arp_ip4_entry_t *e, *es;
1319 ethernet_proxy_arp_t *pa;
1320 clib_error_t *error = 0;
1323 /* Filter entries by interface if given. */
1325 (void) unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index);
1327 es = ip4_neighbor_entries (sw_if_index);
1330 vlib_cli_output (vm, "%U", format_ethernet_arp_ip4_entry, vnm, 0);
1333 vlib_cli_output (vm, "%U", format_ethernet_arp_ip4_entry, vnm, e);
1338 if (vec_len (am->proxy_arps))
1340 vlib_cli_output (vm, "Proxy arps enabled for:");
1341 vec_foreach (pa, am->proxy_arps)
1343 vlib_cli_output (vm, "Fib_index %d %U - %U ",
1345 format_ip4_address, &pa->lo_addr,
1346 format_ip4_address, &pa->hi_addr);
1354 * Display all the IPv4 ARP entries.
1357 * Example of how to display the IPv4 ARP table:
1358 * @cliexstart{show ip arp}
1359 * Time FIB IP4 Flags Ethernet Interface
1360 * 346.3028 0 6.1.1.3 de:ad:be:ef:ba:be GigabitEthernet2/0/0
1361 * 3077.4271 0 6.1.1.4 S de:ad:be:ef:ff:ff GigabitEthernet2/0/0
1362 * 2998.6409 1 6.2.2.3 de:ad:be:ef:00:01 GigabitEthernet2/0/0
1363 * Proxy arps enabled for:
1364 * Fib_index 0 6.0.0.1 - 6.0.0.11
1368 VLIB_CLI_COMMAND (show_ip4_arp_command, static) = {
1369 .path = "show ip arp",
1370 .function = show_ip4_arp,
1371 .short_help = "show ip arp",
1377 pg_edit_t l2_type, l3_type;
1378 pg_edit_t n_l2_address_bytes, n_l3_address_bytes;
1384 } ip4_over_ethernet[2];
1385 } pg_ethernet_arp_header_t;
1388 pg_ethernet_arp_header_init (pg_ethernet_arp_header_t * p)
1390 /* Initialize fields that are not bit fields in the IP header. */
1391 #define _(f) pg_edit_init (&p->f, ethernet_arp_header_t, f);
1394 _(n_l2_address_bytes);
1395 _(n_l3_address_bytes);
1397 _(ip4_over_ethernet[0].ethernet);
1398 _(ip4_over_ethernet[0].ip4);
1399 _(ip4_over_ethernet[1].ethernet);
1400 _(ip4_over_ethernet[1].ip4);
1405 unformat_pg_arp_header (unformat_input_t * input, va_list * args)
1407 pg_stream_t *s = va_arg (*args, pg_stream_t *);
1408 pg_ethernet_arp_header_t *p;
1411 p = pg_create_edit_group (s, sizeof (p[0]), sizeof (ethernet_arp_header_t),
1413 pg_ethernet_arp_header_init (p);
1416 pg_edit_set_fixed (&p->l2_type, ETHERNET_ARP_HARDWARE_TYPE_ethernet);
1417 pg_edit_set_fixed (&p->l3_type, ETHERNET_TYPE_IP4);
1418 pg_edit_set_fixed (&p->n_l2_address_bytes, 6);
1419 pg_edit_set_fixed (&p->n_l3_address_bytes, 4);
1421 if (!unformat (input, "%U: %U/%U -> %U/%U",
1423 unformat_ethernet_arp_opcode_net_byte_order, &p->opcode,
1425 unformat_ethernet_address, &p->ip4_over_ethernet[0].ethernet,
1427 unformat_ip4_address, &p->ip4_over_ethernet[0].ip4,
1429 unformat_ethernet_address, &p->ip4_over_ethernet[1].ethernet,
1431 unformat_ip4_address, &p->ip4_over_ethernet[1].ip4))
1433 /* Free up any edits we may have added. */
1434 pg_free_edit_group (s);
1441 ip4_set_arp_limit (u32 arp_limit)
1443 ethernet_arp_main_t *am = ðernet_arp_main;
1445 am->limit_arp_cache_size = arp_limit;
1450 * @brief Control Plane hook to remove an ARP entry
1453 vnet_arp_unset_ip4_over_ethernet (vnet_main_t * vnm,
1454 u32 sw_if_index, void *a_arg)
1456 ethernet_arp_ip4_over_ethernet_address_t *a = a_arg;
1457 vnet_arp_set_ip4_over_ethernet_rpc_args_t args;
1459 args.sw_if_index = sw_if_index;
1460 args.flags = ETHERNET_ARP_ARGS_REMOVE;
1461 clib_memcpy (&args.a, a, sizeof (*a));
1463 vl_api_rpc_call_main_thread (set_ip4_over_ethernet_rpc_callback,
1464 (u8 *) & args, sizeof (args));
1469 * @brief Internally generated event to flush the ARP cache on an
1470 * interface state change event.
1471 * A flush will remove dynamic ARP entries, and for statics remove the MAC
1472 * address from the corresponding adjacencies.
1475 vnet_arp_flush_ip4_over_ethernet (vnet_main_t * vnm,
1476 u32 sw_if_index, void *a_arg)
1478 ethernet_arp_ip4_over_ethernet_address_t *a = a_arg;
1479 vnet_arp_set_ip4_over_ethernet_rpc_args_t args;
1481 args.sw_if_index = sw_if_index;
1482 args.flags = ETHERNET_ARP_ARGS_FLUSH;
1483 clib_memcpy (&args.a, a, sizeof (*a));
1485 vl_api_rpc_call_main_thread (set_ip4_over_ethernet_rpc_callback,
1486 (u8 *) & args, sizeof (args));
1491 * @brief Internally generated event to populate the ARP cache on an
1492 * interface state change event.
1493 * For static entries this will re-source the adjacencies.
1495 * @param sw_if_index The interface on which the ARP entires are acted
1498 vnet_arp_populate_ip4_over_ethernet (vnet_main_t * vnm,
1499 u32 sw_if_index, void *a_arg)
1501 ethernet_arp_ip4_over_ethernet_address_t *a = a_arg;
1502 vnet_arp_set_ip4_over_ethernet_rpc_args_t args;
1504 args.sw_if_index = sw_if_index;
1505 args.flags = ETHERNET_ARP_ARGS_POPULATE;
1506 clib_memcpy (&args.a, a, sizeof (*a));
1508 vl_api_rpc_call_main_thread (set_ip4_over_ethernet_rpc_callback,
1509 (u8 *) & args, sizeof (args));
1514 * @brief publish wildcard arp event
1515 * @param sw_if_index The interface on which the ARP entires are acted
1518 vnet_arp_wc_publish (u32 sw_if_index, void *a_arg)
1520 ethernet_arp_ip4_over_ethernet_address_t *a = a_arg;
1521 vnet_arp_set_ip4_over_ethernet_rpc_args_t args = {
1522 .flags = ETHERNET_ARP_ARGS_WC_PUB,
1523 .sw_if_index = sw_if_index,
1527 vl_api_rpc_call_main_thread (set_ip4_over_ethernet_rpc_callback,
1528 (u8 *) & args, sizeof (args));
1533 vnet_arp_wc_publish_internal (vnet_main_t * vnm,
1534 vnet_arp_set_ip4_over_ethernet_rpc_args_t *
1537 vlib_main_t *vm = vlib_get_main ();
1538 ethernet_arp_main_t *am = ðernet_arp_main;
1539 if (am->wc_ip4_arp_publisher_node == (uword) ~ 0)
1541 wc_arp_report_t *r =
1542 vlib_process_signal_event_data (vm, am->wc_ip4_arp_publisher_node, 1, 1,
1544 r->ip4 = args->a.ip4.as_u32;
1545 r->sw_if_index = args->sw_if_index;
1546 memcpy (r->mac, args->a.ethernet, sizeof r->mac);
1550 wc_arp_set_publisher_node (uword node_index)
1552 ethernet_arp_main_t *am = ðernet_arp_main;
1553 am->wc_ip4_arp_publisher_node = node_index;
1557 * arp_add_del_interface_address
1559 * callback when an interface address is added or deleted
1562 arp_add_del_interface_address (ip4_main_t * im,
1565 ip4_address_t * address,
1567 u32 if_address_index, u32 is_del)
1570 * Flush the ARP cache of all entries covered by the address
1571 * that is being removed.
1573 ethernet_arp_main_t *am = ðernet_arp_main;
1574 ethernet_arp_ip4_entry_t *e;
1576 if (vec_len (am->ethernet_arp_by_sw_if_index) <= sw_if_index)
1581 ethernet_arp_interface_t *eai;
1582 u32 i, *to_delete = 0;
1585 eai = &am->ethernet_arp_by_sw_if_index[sw_if_index];
1588 hash_foreach_pair (pair, eai->arp_entries,
1590 e = pool_elt_at_index(am->ip4_entry_pool,
1592 if (ip4_destination_matches_route (im, &e->ip4_address,
1593 address, address_length))
1595 vec_add1 (to_delete, e - am->ip4_entry_pool);
1600 for (i = 0; i < vec_len (to_delete); i++)
1602 ethernet_arp_ip4_over_ethernet_address_t delme;
1603 e = pool_elt_at_index (am->ip4_entry_pool, to_delete[i]);
1605 clib_memcpy (&delme.ethernet, e->ethernet_address, 6);
1606 delme.ip4.as_u32 = e->ip4_address.as_u32;
1608 vnet_arp_flush_ip4_over_ethernet (vnet_get_main (),
1609 e->sw_if_index, &delme);
1612 vec_free (to_delete);
1617 arp_adj_fib_remove (ethernet_arp_ip4_entry_t * e, u32 fib_index)
1619 if (FIB_NODE_INDEX_INVALID != e->fib_entry_index)
1621 fib_prefix_t pfx = {
1623 .fp_proto = FIB_PROTOCOL_IP4,
1624 .fp_addr.ip4 = e->ip4_address,
1628 fib_index = ip4_fib_table_get_index_for_sw_if_index (e->sw_if_index);
1630 fib_table_entry_path_remove (fib_index, &pfx,
1634 e->sw_if_index, ~0, 1,
1635 FIB_ROUTE_PATH_FLAG_NONE);
1636 fib_table_unlock (fib_index, FIB_PROTOCOL_IP4, FIB_SOURCE_ADJ);
1641 arp_table_bind (ip4_main_t * im,
1643 u32 sw_if_index, u32 new_fib_index, u32 old_fib_index)
1645 ethernet_arp_main_t *am = ðernet_arp_main;
1646 ethernet_arp_interface_t *eai;
1647 ethernet_arp_ip4_entry_t *e;
1651 * the IP table that the interface is bound to has changed.
1652 * reinstall all the adj fibs.
1655 if (vec_len (am->ethernet_arp_by_sw_if_index) <= sw_if_index)
1658 eai = &am->ethernet_arp_by_sw_if_index[sw_if_index];
1661 hash_foreach_pair (pair, eai->arp_entries,
1663 e = pool_elt_at_index(am->ip4_entry_pool,
1666 * remove the adj-fib from the old table and add to the new
1668 arp_adj_fib_remove(e, old_fib_index);
1669 arp_adj_fib_add(e, new_fib_index);
1675 static clib_error_t *
1676 ethernet_arp_init (vlib_main_t * vm)
1678 ethernet_arp_main_t *am = ðernet_arp_main;
1679 ip4_main_t *im = &ip4_main;
1680 clib_error_t *error;
1683 if ((error = vlib_call_init_function (vm, ethernet_init)))
1686 ethernet_register_input_type (vm, ETHERNET_TYPE_ARP, arp_input_node.index);
1688 pn = pg_get_node (arp_input_node.index);
1689 pn->unformat_edit = unformat_pg_arp_header;
1691 am->opcode_by_name = hash_create_string (0, sizeof (uword));
1692 #define _(o) hash_set_mem (am->opcode_by_name, #o, ETHERNET_ARP_OPCODE_##o);
1693 foreach_ethernet_arp_opcode;
1696 /* $$$ configurable */
1697 am->limit_arp_cache_size = 50000;
1699 am->pending_resolutions_by_address = hash_create (0, sizeof (uword));
1700 am->mac_changes_by_address = hash_create (0, sizeof (uword));
1701 am->wc_ip4_arp_publisher_node = (uword) ~ 0;
1703 /* don't trace ARP error packets */
1705 vlib_node_runtime_t *rt =
1706 vlib_node_get_runtime (vm, arp_input_node.index);
1709 vnet_pcap_drop_trace_filter_add_del \
1710 (rt->errors[ETHERNET_ARP_ERROR_##a], \
1712 foreach_ethernet_arp_error
1716 ip4_add_del_interface_address_callback_t cb;
1717 cb.function = arp_add_del_interface_address;
1718 cb.function_opaque = 0;
1719 vec_add1 (im->add_del_interface_address_callbacks, cb);
1721 ip4_table_bind_callback_t cbt;
1722 cbt.function = arp_table_bind;
1723 cbt.function_opaque = 0;
1724 vec_add1 (im->table_bind_callbacks, cbt);
1729 VLIB_INIT_FUNCTION (ethernet_arp_init);
1732 arp_entry_free (ethernet_arp_interface_t * eai, ethernet_arp_ip4_entry_t * e)
1734 ethernet_arp_main_t *am = ðernet_arp_main;
1736 arp_adj_fib_remove (e,
1737 ip4_fib_table_get_index_for_sw_if_index
1739 hash_unset (eai->arp_entries, e->ip4_address.as_u32);
1740 pool_put (am->ip4_entry_pool, e);
1744 vnet_arp_unset_ip4_over_ethernet_internal (vnet_main_t * vnm,
1745 vnet_arp_set_ip4_over_ethernet_rpc_args_t
1748 ethernet_arp_main_t *am = ðernet_arp_main;
1749 ethernet_arp_ip4_entry_t *e;
1750 ethernet_arp_interface_t *eai;
1752 if (vec_len (am->ethernet_arp_by_sw_if_index) <= args->sw_if_index)
1755 eai = &am->ethernet_arp_by_sw_if_index[args->sw_if_index];
1757 e = arp_entry_find (eai, &args->a.ip4);
1761 arp_entry_free (eai, e);
1763 adj_nbr_walk_nh4 (e->sw_if_index,
1764 &e->ip4_address, arp_mk_incomplete_walk, NULL);
1771 vnet_arp_flush_ip4_over_ethernet_internal (vnet_main_t * vnm,
1772 vnet_arp_set_ip4_over_ethernet_rpc_args_t
1775 ethernet_arp_main_t *am = ðernet_arp_main;
1776 ethernet_arp_ip4_entry_t *e;
1777 ethernet_arp_interface_t *eai;
1779 if (vec_len (am->ethernet_arp_by_sw_if_index) <= args->sw_if_index)
1782 eai = &am->ethernet_arp_by_sw_if_index[args->sw_if_index];
1784 e = arp_entry_find (eai, &args->a.ip4);
1788 adj_nbr_walk_nh4 (e->sw_if_index,
1789 &e->ip4_address, arp_mk_incomplete_walk, e);
1792 * The difference between flush and unset, is that an unset
1793 * means delete for static and dynamic entries. A flush
1794 * means delete only for dynamic. Flushing is what the DP
1795 * does in response to interface events. unset is only done
1796 * by the control plane.
1798 if (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC)
1800 e->flags &= ETHERNET_ARP_IP4_ENTRY_FLAG_DYNAMIC;
1802 else if (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_DYNAMIC)
1804 arp_entry_free (eai, e);
1811 vnet_arp_populate_ip4_over_ethernet_internal (vnet_main_t * vnm,
1812 vnet_arp_set_ip4_over_ethernet_rpc_args_t
1815 ethernet_arp_main_t *am = ðernet_arp_main;
1816 ethernet_arp_ip4_entry_t *e;
1817 ethernet_arp_interface_t *eai;
1819 vec_validate (am->ethernet_arp_by_sw_if_index, args->sw_if_index);
1820 eai = &am->ethernet_arp_by_sw_if_index[args->sw_if_index];
1822 e = arp_entry_find (eai, &args->a.ip4);
1826 adj_nbr_walk_nh4 (e->sw_if_index,
1827 &e->ip4_address, arp_mk_complete_walk, e);
1833 set_ip4_over_ethernet_rpc_callback (vnet_arp_set_ip4_over_ethernet_rpc_args_t
1836 vnet_main_t *vm = vnet_get_main ();
1837 ASSERT (vlib_get_thread_index () == 0);
1839 if (a->flags & ETHERNET_ARP_ARGS_REMOVE)
1840 vnet_arp_unset_ip4_over_ethernet_internal (vm, a);
1841 else if (a->flags & ETHERNET_ARP_ARGS_FLUSH)
1842 vnet_arp_flush_ip4_over_ethernet_internal (vm, a);
1843 else if (a->flags & ETHERNET_ARP_ARGS_POPULATE)
1844 vnet_arp_populate_ip4_over_ethernet_internal (vm, a);
1845 else if (a->flags & ETHERNET_ARP_ARGS_WC_PUB)
1846 vnet_arp_wc_publish_internal (vm, a);
1848 vnet_arp_set_ip4_over_ethernet_internal (vm, a);
1852 * @brief Invoked when the interface's admin state changes
1854 static clib_error_t *
1855 ethernet_arp_sw_interface_up_down (vnet_main_t * vnm,
1856 u32 sw_if_index, u32 flags)
1858 ethernet_arp_main_t *am = ðernet_arp_main;
1859 ethernet_arp_ip4_entry_t *e;
1860 u32 i, *to_delete = 0;
1863 pool_foreach (e, am->ip4_entry_pool,
1865 if (e->sw_if_index == sw_if_index)
1866 vec_add1 (to_delete,
1867 e - am->ip4_entry_pool);
1871 for (i = 0; i < vec_len (to_delete); i++)
1873 ethernet_arp_ip4_over_ethernet_address_t delme;
1874 e = pool_elt_at_index (am->ip4_entry_pool, to_delete[i]);
1876 clib_memcpy (&delme.ethernet, e->ethernet_address, 6);
1877 delme.ip4.as_u32 = e->ip4_address.as_u32;
1879 if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
1881 vnet_arp_populate_ip4_over_ethernet (vnm, e->sw_if_index, &delme);
1885 vnet_arp_flush_ip4_over_ethernet (vnm, e->sw_if_index, &delme);
1889 vec_free (to_delete);
1894 VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (ethernet_arp_sw_interface_up_down);
1897 increment_ip4_and_mac_address (ethernet_arp_ip4_over_ethernet_address_t * a)
1902 for (i = 3; i >= 0; i--)
1904 old = a->ip4.as_u8[i];
1905 a->ip4.as_u8[i] += 1;
1906 if (old < a->ip4.as_u8[i])
1910 for (i = 5; i >= 0; i--)
1912 old = a->ethernet[i];
1913 a->ethernet[i] += 1;
1914 if (old < a->ethernet[i])
1920 vnet_arp_set_ip4_over_ethernet (vnet_main_t * vnm,
1921 u32 sw_if_index, void *a_arg,
1922 int is_static, int is_no_fib_entry)
1924 ethernet_arp_ip4_over_ethernet_address_t *a = a_arg;
1925 vnet_arp_set_ip4_over_ethernet_rpc_args_t args;
1927 args.sw_if_index = sw_if_index;
1928 args.is_static = is_static;
1929 args.is_no_fib_entry = is_no_fib_entry;
1931 clib_memcpy (&args.a, a, sizeof (*a));
1933 vl_api_rpc_call_main_thread (set_ip4_over_ethernet_rpc_callback,
1934 (u8 *) & args, sizeof (args));
1939 vnet_proxy_arp_add_del (ip4_address_t * lo_addr,
1940 ip4_address_t * hi_addr, u32 fib_index, int is_del)
1942 ethernet_arp_main_t *am = ðernet_arp_main;
1943 ethernet_proxy_arp_t *pa;
1944 u32 found_at_index = ~0;
1946 vec_foreach (pa, am->proxy_arps)
1948 if (pa->lo_addr == lo_addr->as_u32
1949 && pa->hi_addr == hi_addr->as_u32 && pa->fib_index == fib_index)
1951 found_at_index = pa - am->proxy_arps;
1956 if (found_at_index != ~0)
1958 /* Delete, otherwise it's already in the table */
1960 vec_delete (am->proxy_arps, 1, found_at_index);
1963 /* delete, no such entry */
1965 return VNET_API_ERROR_NO_SUCH_ENTRY;
1967 /* add, not in table */
1968 vec_add2 (am->proxy_arps, pa, 1);
1969 pa->lo_addr = lo_addr->as_u32;
1970 pa->hi_addr = hi_addr->as_u32;
1971 pa->fib_index = fib_index;
1976 * Remove any proxy arp entries asdociated with the
1980 vnet_proxy_arp_fib_reset (u32 fib_id)
1982 ethernet_arp_main_t *am = ðernet_arp_main;
1983 ethernet_proxy_arp_t *pa;
1984 u32 *entries_to_delete = 0;
1988 fib_index = fib_table_find (FIB_PROTOCOL_IP4, fib_id);
1989 if (~0 == fib_index)
1990 return VNET_API_ERROR_NO_SUCH_ENTRY;
1992 vec_foreach (pa, am->proxy_arps)
1994 if (pa->fib_index == fib_index)
1996 vec_add1 (entries_to_delete, pa - am->proxy_arps);
2000 for (i = 0; i < vec_len (entries_to_delete); i++)
2002 vec_delete (am->proxy_arps, 1, entries_to_delete[i]);
2005 vec_free (entries_to_delete);
2010 static clib_error_t *
2011 ip_arp_add_del_command_fn (vlib_main_t * vm,
2012 unformat_input_t * input, vlib_cli_command_t * cmd)
2014 vnet_main_t *vnm = vnet_get_main ();
2016 ethernet_arp_ip4_over_ethernet_address_t lo_addr, hi_addr, addr;
2023 int is_no_fib_entry = 0;
2026 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2028 /* set ip arp TenGigE1/1/0/1 1.2.3.4 aa:bb:... or aabb.ccdd... */
2029 if (unformat (input, "%U %U %U",
2030 unformat_vnet_sw_interface, vnm, &sw_if_index,
2031 unformat_ip4_address, &addr.ip4,
2032 unformat_ethernet_address, &addr.ethernet))
2035 else if (unformat (input, "delete") || unformat (input, "del"))
2038 else if (unformat (input, "static"))
2041 else if (unformat (input, "no-fib-entry"))
2042 is_no_fib_entry = 1;
2044 else if (unformat (input, "count %d", &count))
2047 else if (unformat (input, "fib-id %d", &fib_id))
2049 fib_index = fib_table_find (FIB_PROTOCOL_IP4, fib_id);
2051 if (~0 == fib_index)
2052 return clib_error_return (0, "fib ID %d doesn't exist\n", fib_id);
2055 else if (unformat (input, "proxy %U - %U",
2056 unformat_ip4_address, &lo_addr.ip4,
2057 unformat_ip4_address, &hi_addr.ip4))
2065 (void) vnet_proxy_arp_add_del (&lo_addr.ip4, &hi_addr.ip4,
2074 for (i = 0; i < count; i++)
2078 uword event_type, *event_data = 0;
2080 /* Park the debug CLI until the arp entry is installed */
2081 vnet_register_ip4_arp_resolution_event
2082 (vnm, &addr.ip4, vlib_current_process (vm),
2083 1 /* type */ , 0 /* data */ );
2085 vnet_arp_set_ip4_over_ethernet
2086 (vnm, sw_if_index, &addr, is_static, is_no_fib_entry);
2088 vlib_process_wait_for_event (vm);
2089 event_type = vlib_process_get_events (vm, &event_data);
2090 vec_reset_length (event_data);
2091 if (event_type != 1)
2092 clib_warning ("event type %d unexpected", event_type);
2095 vnet_arp_unset_ip4_over_ethernet (vnm, sw_if_index, &addr);
2097 increment_ip4_and_mac_address (&addr);
2102 return clib_error_return (0, "unknown input `%U'",
2103 format_unformat_error, input);
2111 * Add or delete IPv4 ARP cache entries.
2113 * @note 'set ip arp' options (e.g. delete, static, 'fib-id <id>',
2114 * 'count <number>', 'interface ip4_addr mac_addr') can be added in
2115 * any order and combination.
2119 * Add or delete IPv4 ARP cache entries as follows. MAC Address can be in
2120 * either aa:bb:cc:dd:ee:ff format or aabb.ccdd.eeff format.
2121 * @cliexcmd{set ip arp GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2122 * @cliexcmd{set ip arp delete GigabitEthernet2/0/0 6.0.0.3 de:ad:be:ef:ba:be}
2124 * To add or delete an IPv4 ARP cache entry to or from a specific fib
2126 * @cliexcmd{set ip arp fib-id 1 GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2127 * @cliexcmd{set ip arp fib-id 1 delete GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2129 * Add or delete IPv4 static ARP cache entries as follows:
2130 * @cliexcmd{set ip arp static GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2131 * @cliexcmd{set ip arp static delete GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2133 * For testing / debugging purposes, the 'set ip arp' command can add or
2134 * delete multiple entries. Supply the 'count N' parameter:
2135 * @cliexcmd{set ip arp count 10 GigabitEthernet2/0/0 6.0.0.3 dead.beef.babe}
2138 VLIB_CLI_COMMAND (ip_arp_add_del_command, static) = {
2139 .path = "set ip arp",
2141 "set ip arp [del] <intfc> <ip-address> <mac-address> [static] [no-fib-entry] [count <count>] [fib-id <fib-id>] [proxy <lo-addr> - <hi-addr>]",
2142 .function = ip_arp_add_del_command_fn,
2146 static clib_error_t *
2147 set_int_proxy_arp_command_fn (vlib_main_t * vm,
2149 input, vlib_cli_command_t * cmd)
2151 vnet_main_t *vnm = vnet_get_main ();
2153 vnet_sw_interface_t *si;
2157 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2159 if (unformat (input, "%U", unformat_vnet_sw_interface,
2162 else if (unformat (input, "enable") || unformat (input, "on"))
2164 else if (unformat (input, "disable") || unformat (input, "off"))
2171 return clib_error_return (0, "unknown input '%U'",
2172 format_unformat_error, input);
2174 si = vnet_get_sw_interface (vnm, sw_if_index);
2177 si->flags |= VNET_SW_INTERFACE_FLAG_PROXY_ARP;
2179 si->flags &= ~VNET_SW_INTERFACE_FLAG_PROXY_ARP;
2186 * Enable proxy-arp on an interface. The vpp stack will answer ARP
2187 * requests for the indicated address range. Multiple proxy-arp
2188 * ranges may be provisioned.
2190 * @note Proxy ARP as a technology is infamous for blackholing traffic.
2191 * Also, the underlying implementation has not been performance-tuned.
2192 * Avoid creating an unnecessarily large set of ranges.
2195 * To enable proxy arp on a range of addresses, use:
2196 * @cliexcmd{set ip arp proxy 6.0.0.1 - 6.0.0.11}
2197 * Append 'del' to delete a range of proxy ARP addresses:
2198 * @cliexcmd{set ip arp proxy 6.0.0.1 - 6.0.0.11 del}
2199 * You must then specifically enable proxy arp on individual interfaces:
2200 * @cliexcmd{set interface proxy-arp GigabitEthernet0/8/0 enable}
2201 * To disable proxy arp on an individual interface:
2202 * @cliexcmd{set interface proxy-arp GigabitEthernet0/8/0 disable}
2204 VLIB_CLI_COMMAND (set_int_proxy_enable_command, static) = {
2205 .path = "set interface proxy-arp",
2207 "set interface proxy-arp <intfc> [enable|disable]",
2208 .function = set_int_proxy_arp_command_fn,
2214 * ARP/ND Termination in a L2 Bridge Domain based on IP4/IP6 to MAC
2215 * hash tables mac_by_ip4 and mac_by_ip6 for each BD.
2219 ARP_TERM_NEXT_L2_OUTPUT,
2224 u32 arp_term_next_node_index[32];
2227 arp_term_l2bd (vlib_main_t * vm,
2228 vlib_node_runtime_t * node, vlib_frame_t * frame)
2230 l2input_main_t *l2im = &l2input_main;
2231 u32 n_left_from, next_index, *from, *to_next;
2232 u32 n_replies_sent = 0;
2233 u16 last_bd_index = ~0;
2234 l2_bridge_domain_t *last_bd_config = 0;
2235 l2_input_config_t *cfg0;
2237 from = vlib_frame_vector_args (frame);
2238 n_left_from = frame->n_vectors;
2239 next_index = node->cached_next_index;
2241 while (n_left_from > 0)
2245 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2247 while (n_left_from > 0 && n_left_to_next > 0)
2250 ethernet_header_t *eth0;
2251 ethernet_arp_header_t *arp0;
2254 u32 pi0, error0, next0, sw_if_index0;
2266 n_left_to_next -= 1;
2268 p0 = vlib_get_buffer (vm, pi0);
2269 // Terminate only local (SHG == 0) ARP
2270 if (vnet_buffer (p0)->l2.shg != 0)
2271 goto next_l2_feature;
2273 eth0 = vlib_buffer_get_current (p0);
2274 l3h0 = (u8 *) eth0 + vnet_buffer (p0)->l2.l2_len;
2275 ethertype0 = clib_net_to_host_u16 (*(u16 *) (l3h0 - 2));
2276 arp0 = (ethernet_arp_header_t *) l3h0;
2278 if (PREDICT_FALSE ((ethertype0 != ETHERNET_TYPE_ARP) ||
2280 clib_host_to_net_u16
2281 (ETHERNET_ARP_OPCODE_request))))
2284 /* Must be ARP request packet here */
2285 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) &&
2286 (p0->flags & VLIB_BUFFER_IS_TRACED)))
2288 u8 *t0 = vlib_add_trace (vm, node, p0,
2289 sizeof (ethernet_arp_input_trace_t));
2290 clib_memcpy (t0, l3h0, sizeof (ethernet_arp_input_trace_t));
2293 error0 = ETHERNET_ARP_ERROR_replies_sent;
2296 clib_net_to_host_u16 (ETHERNET_ARP_HARDWARE_TYPE_ethernet)
2297 ? ETHERNET_ARP_ERROR_l2_type_not_ethernet : error0);
2300 clib_net_to_host_u16 (ETHERNET_TYPE_IP4) ?
2301 ETHERNET_ARP_ERROR_l3_type_not_ip4 : error0);
2303 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
2310 clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply))
2313 (arp0->ip4_over_ethernet[0].ethernet, vrrp_prefix,
2314 sizeof (vrrp_prefix))));
2316 /* Trash ARP packets whose ARP-level source addresses do not
2317 match their L2-frame-level source addresses, unless it's
2318 a reply from a VRRP virtual router */
2320 (memcmp (eth0->src_address, arp0->ip4_over_ethernet[0].ethernet,
2321 sizeof (eth0->src_address)) && !is_vrrp_reply0))
2323 error0 = ETHERNET_ARP_ERROR_l2_address_mismatch;
2327 /* Check if anyone want ARP request events for L2 BDs */
2329 ethernet_arp_main_t *am = ðernet_arp_main;
2330 if (am->wc_ip4_arp_publisher_node != (uword) ~ 0)
2331 vnet_arp_wc_publish (sw_if_index0, &arp0->ip4_over_ethernet[0]);
2334 /* lookup BD mac_by_ip4 hash table for MAC entry */
2335 ip0 = arp0->ip4_over_ethernet[1].ip4.as_u32;
2336 bd_index0 = vnet_buffer (p0)->l2.bd_index;
2337 if (PREDICT_FALSE ((bd_index0 != last_bd_index)
2338 || (last_bd_index == (u16) ~ 0)))
2340 last_bd_index = bd_index0;
2341 last_bd_config = vec_elt_at_index (l2im->bd_configs, bd_index0);
2343 macp0 = (u8 *) hash_get (last_bd_config->mac_by_ip4, ip0);
2345 if (PREDICT_FALSE (!macp0))
2346 goto next_l2_feature; /* MAC not found */
2348 /* MAC found, send ARP reply -
2349 Convert ARP request packet to ARP reply */
2350 arp0->opcode = clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply);
2351 arp0->ip4_over_ethernet[1] = arp0->ip4_over_ethernet[0];
2352 arp0->ip4_over_ethernet[0].ip4.as_u32 = ip0;
2353 clib_memcpy (arp0->ip4_over_ethernet[0].ethernet, macp0, 6);
2354 clib_memcpy (eth0->dst_address, eth0->src_address, 6);
2355 clib_memcpy (eth0->src_address, macp0, 6);
2356 n_replies_sent += 1;
2359 /* For BVI, need to use l2-fwd node to send ARP reply as
2360 l2-output node cannot output packet to BVI properly */
2361 cfg0 = vec_elt_at_index (l2im->configs, sw_if_index0);
2362 if (PREDICT_FALSE (cfg0->bvi))
2364 vnet_buffer (p0)->l2.feature_bitmap |= L2INPUT_FEAT_FWD;
2365 vnet_buffer (p0)->sw_if_index[VLIB_RX] = 0;
2366 goto next_l2_feature;
2369 /* Send ARP/ND reply back out input interface through l2-output */
2370 vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
2371 next0 = ARP_TERM_NEXT_L2_OUTPUT;
2372 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2373 to_next, n_left_to_next, pi0,
2378 /* IP6 ND event notification or solicitation handling to generate
2379 local response instead of flooding */
2380 iph0 = (ip6_header_t *) l3h0;
2381 if (PREDICT_FALSE (ethertype0 == ETHERNET_TYPE_IP6 &&
2382 iph0->protocol == IP_PROTOCOL_ICMP6 &&
2383 !ip6_address_is_unspecified
2384 (&iph0->src_address)))
2386 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
2387 if (vnet_ip6_nd_term
2388 (vm, node, p0, eth0, iph0, sw_if_index0,
2389 vnet_buffer (p0)->l2.bd_index))
2390 goto output_response;
2395 next0 = vnet_l2_feature_next (p0, arp_term_next_node_index,
2396 L2INPUT_FEAT_ARP_TERM);
2397 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2398 to_next, n_left_to_next,
2404 if (0 == arp0->ip4_over_ethernet[0].ip4.as_u32 ||
2405 (arp0->ip4_over_ethernet[0].ip4.as_u32 ==
2406 arp0->ip4_over_ethernet[1].ip4.as_u32))
2408 error0 = ETHERNET_ARP_ERROR_gratuitous_arp;
2410 next0 = ARP_TERM_NEXT_DROP;
2411 p0->error = node->errors[error0];
2413 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2414 to_next, n_left_to_next, pi0,
2418 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2421 vlib_error_count (vm, node->node_index,
2422 ETHERNET_ARP_ERROR_replies_sent, n_replies_sent);
2423 return frame->n_vectors;
2427 VLIB_REGISTER_NODE (arp_term_l2bd_node, static) = {
2428 .function = arp_term_l2bd,
2429 .name = "arp-term-l2bd",
2430 .vector_size = sizeof (u32),
2431 .n_errors = ETHERNET_ARP_N_ERROR,
2432 .error_strings = ethernet_arp_error_strings,
2433 .n_next_nodes = ARP_TERM_N_NEXT,
2435 [ARP_TERM_NEXT_L2_OUTPUT] = "l2-output",
2436 [ARP_TERM_NEXT_DROP] = "error-drop",
2438 .format_buffer = format_ethernet_arp_header,
2439 .format_trace = format_arp_term_input_trace,
2444 arp_term_init (vlib_main_t * vm)
2446 // Initialize the feature next-node indexes
2447 feat_bitmap_init_next_nodes (vm,
2448 arp_term_l2bd_node.index,
2450 l2input_get_feat_names (),
2451 arp_term_next_node_index);
2455 VLIB_INIT_FUNCTION (arp_term_init);
2458 change_arp_mac (u32 sw_if_index, ethernet_arp_ip4_entry_t * e)
2460 if (e->sw_if_index == sw_if_index)
2462 adj_nbr_walk_nh4 (e->sw_if_index,
2463 &e->ip4_address, arp_mk_complete_walk, e);
2468 ethernet_arp_change_mac (u32 sw_if_index)
2470 ethernet_arp_main_t *am = ðernet_arp_main;
2471 ethernet_arp_ip4_entry_t *e;
2474 pool_foreach (e, am->ip4_entry_pool,
2476 change_arp_mac (sw_if_index, e);
2482 send_ip4_garp (vlib_main_t * vm, vnet_hw_interface_t * hi)
2484 ip4_main_t *i4m = &ip4_main;
2485 u32 sw_if_index = hi->sw_if_index;
2486 ip4_address_t *ip4_addr = ip4_interface_first_address (i4m, sw_if_index, 0);
2490 clib_warning ("Sending GARP for IP4 address %U on sw_if_idex %d",
2491 format_ip4_address, ip4_addr, sw_if_index);
2493 /* Form GARP packet for output - Gratuitous ARP is an ARP request packet
2494 where the interface IP/MAC pair is used for both source and request
2495 MAC/IP pairs in the request */
2497 ethernet_arp_header_t *h = vlib_packet_template_get_packet
2498 (vm, &i4m->ip4_arp_request_packet_template, &bi);
2499 clib_memcpy (h->ip4_over_ethernet[0].ethernet, hi->hw_address,
2500 sizeof (h->ip4_over_ethernet[0].ethernet));
2501 clib_memcpy (h->ip4_over_ethernet[1].ethernet, hi->hw_address,
2502 sizeof (h->ip4_over_ethernet[1].ethernet));
2503 h->ip4_over_ethernet[0].ip4 = ip4_addr[0];
2504 h->ip4_over_ethernet[1].ip4 = ip4_addr[0];
2506 /* Setup MAC header with ARP Etype and broadcast DMAC */
2507 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
2508 vlib_buffer_advance (b, -sizeof (ethernet_header_t));
2509 ethernet_header_t *e = vlib_buffer_get_current (b);
2510 e->type = clib_host_to_net_u16 (ETHERNET_TYPE_ARP);
2511 clib_memcpy (e->src_address, hi->hw_address, sizeof (e->src_address));
2512 memset (e->dst_address, 0xff, sizeof (e->dst_address));
2514 /* Send GARP packet out the specified interface */
2515 vnet_buffer (b)->sw_if_index[VLIB_RX] =
2516 vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index;
2517 vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index);
2518 u32 *to_next = vlib_frame_vector_args (f);
2521 vlib_put_frame_to_node (vm, hi->output_node_index, f);
2525 static vlib_node_registration_t send_garp_na_proc_node;
2528 send_garp_na_process (vlib_main_t * vm,
2529 vlib_node_runtime_t * rt, vlib_frame_t * f)
2531 vnet_main_t *vnm = vnet_get_main ();
2532 uword event_type, *event_data = 0;
2534 send_garp_na_process_node_index = send_garp_na_proc_node.index;
2538 vlib_process_wait_for_event (vm);
2539 event_type = vlib_process_get_events (vm, &event_data);
2540 if ((event_type == SEND_GARP_NA) && (vec_len (event_data) >= 1))
2542 u32 hw_if_index = event_data[0];
2543 vnet_hw_interface_t *hi = vnet_get_hw_interface (vnm, hw_if_index);
2544 send_ip4_garp (vm, hi);
2545 send_ip6_na (vm, hi);
2547 vec_reset_length (event_data);
2554 VLIB_REGISTER_NODE (send_garp_na_proc_node, static) = {
2555 .function = send_garp_na_process,
2556 .type = VLIB_NODE_TYPE_PROCESS,
2557 .name = "send-garp-na-process",
2562 * fd.io coding-style-patch-verification: ON
2565 * eval: (c-set-style "gnu")