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/ethernet/ethernet.h>
20 #include <vnet/ethernet/arp_packet.h>
21 #include <vnet/l2/l2_input.h>
22 #include <vppinfra/mhash.h>
24 void vl_api_rpc_call_main_thread (void *fp, u8 * data, u32 data_length);
29 ip4_address_t ip4_address;
30 } ethernet_arp_ip4_key_t;
33 ethernet_arp_ip4_key_t key;
34 u8 ethernet_address[6];
37 #define ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC (1 << 0)
38 #define ETHERNET_ARP_IP4_ENTRY_FLAG_GLEAN (2 << 0)
40 u64 cpu_time_last_updated;
43 } ethernet_arp_ip4_entry_t;
49 } ethernet_proxy_arp_t;
56 /* Used for arp event notification only */
59 } pending_resolution_t;
62 /* Hash tables mapping name to opcode. */
63 uword * opcode_by_name;
65 /* lite beer "glean" adjacency handling */
66 uword * pending_resolutions_by_address;
67 pending_resolution_t * pending_resolutions;
69 /* Mac address change notification */
70 uword * mac_changes_by_address;
71 pending_resolution_t * mac_changes;
73 ethernet_arp_ip4_entry_t * ip4_entry_pool;
75 mhash_t ip4_entry_by_key;
77 /* ARP attack mitigation */
79 u32 limit_arp_cache_size;
81 /* Proxy arp vector */
82 ethernet_proxy_arp_t * proxy_arps;
83 } ethernet_arp_main_t;
85 static ethernet_arp_main_t ethernet_arp_main;
87 static u8 * format_ethernet_arp_hardware_type (u8 * s, va_list * va)
89 ethernet_arp_hardware_type_t h = va_arg (*va, ethernet_arp_hardware_type_t);
93 #define _(n,f) case n: t = #f; break;
94 foreach_ethernet_arp_hardware_type;
98 return format (s, "unknown 0x%x", h);
101 return format (s, "%s", t);
104 static u8 * format_ethernet_arp_opcode (u8 * s, va_list * va)
106 ethernet_arp_opcode_t o = va_arg (*va, ethernet_arp_opcode_t);
110 #define _(f) case ETHERNET_ARP_OPCODE_##f: t = #f; break;
111 foreach_ethernet_arp_opcode;
115 return format (s, "unknown 0x%x", o);
118 return format (s, "%s", t);
122 unformat_ethernet_arp_opcode_host_byte_order (unformat_input_t * input,
125 int * result = va_arg (*args, int *);
126 ethernet_arp_main_t * am = ðernet_arp_main;
129 /* Numeric opcode. */
130 if (unformat (input, "0x%x", &x)
131 || unformat (input, "%d", &x))
140 if (unformat_user (input, unformat_vlib_number_by_name,
141 am->opcode_by_name, &i))
151 unformat_ethernet_arp_opcode_net_byte_order (unformat_input_t * input,
154 int * result = va_arg (*args, int *);
155 if (! unformat_user (input, unformat_ethernet_arp_opcode_host_byte_order, result))
158 *result = clib_host_to_net_u16 ((u16) *result);
162 static u8 * format_ethernet_arp_header (u8 * s, va_list * va)
164 ethernet_arp_header_t * a = va_arg (*va, ethernet_arp_header_t *);
165 u32 max_header_bytes = va_arg (*va, u32);
167 u16 l2_type, l3_type;
169 if (max_header_bytes != 0 && sizeof (a[0]) > max_header_bytes)
170 return format (s, "ARP header truncated");
172 l2_type = clib_net_to_host_u16 (a->l2_type);
173 l3_type = clib_net_to_host_u16 (a->l3_type);
175 indent = format_get_indent (s);
177 s = format (s, "%U, type %U/%U, address size %d/%d",
178 format_ethernet_arp_opcode, clib_net_to_host_u16 (a->opcode),
179 format_ethernet_arp_hardware_type, l2_type,
180 format_ethernet_type, l3_type,
181 a->n_l2_address_bytes, a->n_l3_address_bytes);
183 if (l2_type == ETHERNET_ARP_HARDWARE_TYPE_ethernet
184 && l3_type == ETHERNET_TYPE_IP4)
186 s = format (s, "\n%U%U/%U -> %U/%U",
187 format_white_space, indent,
188 format_ethernet_address, a->ip4_over_ethernet[0].ethernet,
189 format_ip4_address, &a->ip4_over_ethernet[0].ip4,
190 format_ethernet_address, a->ip4_over_ethernet[1].ethernet,
191 format_ip4_address, &a->ip4_over_ethernet[1].ip4);
195 uword n2 = a->n_l2_address_bytes;
196 uword n3 = a->n_l3_address_bytes;
197 s = format (s, "\n%U%U/%U -> %U/%U",
198 format_white_space, indent,
199 format_hex_bytes, a->data + 0*n2 + 0*n3, n2,
200 format_hex_bytes, a->data + 1*n2 + 0*n3, n3,
201 format_hex_bytes, a->data + 1*n2 + 1*n3, n2,
202 format_hex_bytes, a->data + 2*n2 + 1*n3, n3);
208 static u8 * format_ethernet_arp_ip4_entry (u8 * s, va_list * va)
210 vnet_main_t * vnm = va_arg (*va, vnet_main_t *);
211 ethernet_arp_ip4_entry_t * e = va_arg (*va, ethernet_arp_ip4_entry_t *);
212 vnet_sw_interface_t * si;
217 return format (s, "%=12s%=6s%=16s%=6s%=20s%=24s", "Time", "FIB", "IP4",
218 "Flags", "Ethernet", "Interface");
220 fib = find_ip4_fib_by_table_index_or_id (&ip4_main, e->key.fib_index,
221 IP4_ROUTE_FLAG_FIB_INDEX);
222 si = vnet_get_sw_interface (vnm, e->key.sw_if_index);
224 if (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_GLEAN)
225 flags = format(flags, "G");
227 if (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC)
228 flags = format(flags, "S");
230 s = format (s, "%=12U%=6u%=16U%=6s%=20U%=24U",
231 format_vlib_cpu_time, vnm->vlib_main, e->cpu_time_last_updated,
233 format_ip4_address, &e->key.ip4_address,
234 flags ? (char *) flags : "",
235 format_ethernet_address, e->ethernet_address,
236 format_vnet_sw_interface_name, vnm, si);
244 } ethernet_arp_input_trace_t;
246 static u8 * format_ethernet_arp_input_trace (u8 * s, va_list * va)
248 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
249 CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
250 ethernet_arp_input_trace_t * t = va_arg (*va, ethernet_arp_input_trace_t *);
253 format_ethernet_arp_header,
254 t->packet_data, sizeof (t->packet_data));
260 ethernet_arp_sw_interface_up_down (vnet_main_t * vnm,
264 ethernet_arp_main_t * am = ðernet_arp_main;
265 ethernet_arp_ip4_entry_t * e;
267 if (! (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
269 u32 i, * to_delete = 0;
271 pool_foreach (e, am->ip4_entry_pool, ({
272 if (e->key.sw_if_index == sw_if_index)
273 vec_add1 (to_delete, e - am->ip4_entry_pool);
276 for (i = 0; i < vec_len (to_delete); i++)
278 ethernet_arp_ip4_over_ethernet_address_t delme;
279 e = pool_elt_at_index (am->ip4_entry_pool, to_delete[i]);
281 clib_memcpy (&delme.ethernet, e->ethernet_address, 6);
282 delme.ip4.as_u32 = e->key.ip4_address.as_u32;
284 vnet_arp_unset_ip4_over_ethernet (vnm, e->key.sw_if_index,
285 e->key.fib_index, &delme);
288 vec_free (to_delete);
294 VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (ethernet_arp_sw_interface_up_down);
297 vnet_arp_set_ip4_over_ethernet_internal (vnet_main_t * vnm,
304 vnet_arp_unset_ip4_over_ethernet_internal (vnet_main_t * vnm,
312 ethernet_arp_ip4_over_ethernet_address_t a;
314 int is_remove; /* set is_remove=1 to clear arp entry */
315 } vnet_arp_set_ip4_over_ethernet_rpc_args_t;
317 static void set_ip4_over_ethernet_rpc_callback
318 ( vnet_arp_set_ip4_over_ethernet_rpc_args_t * a)
320 vnet_main_t * vm = vnet_get_main();
321 ASSERT(os_get_cpu_number() == 0);
324 vnet_arp_unset_ip4_over_ethernet_internal(vm,
329 vnet_arp_set_ip4_over_ethernet_internal (vm,
337 vnet_arp_set_ip4_over_ethernet (vnet_main_t * vnm,
343 ethernet_arp_ip4_over_ethernet_address_t * a = a_arg;
344 vnet_arp_set_ip4_over_ethernet_rpc_args_t args;
346 args.sw_if_index = sw_if_index;
347 args.fib_index = fib_index;
348 args.is_static = is_static;
350 clib_memcpy (&args.a, a, sizeof (*a));
352 vl_api_rpc_call_main_thread (set_ip4_over_ethernet_rpc_callback,
353 (u8 *) &args, sizeof (args));
358 vnet_arp_set_ip4_over_ethernet_internal (vnet_main_t * vnm,
364 ethernet_arp_ip4_key_t k;
365 ethernet_arp_ip4_entry_t * e = 0;
366 ethernet_arp_main_t * am = ðernet_arp_main;
367 ethernet_arp_ip4_over_ethernet_address_t * a = a_arg;
368 vlib_main_t * vm = vlib_get_main();
369 ip4_main_t * im = &ip4_main;
370 ip_lookup_main_t * lm = &im->lookup_main;
371 int make_new_arp_cache_entry=1;
373 ip4_add_del_route_args_t args;
374 ip_adjacency_t adj, * existing_adj;
375 pending_resolution_t * pr, * mc;
380 fib_index = (fib_index != (u32)~0)
381 ? fib_index : im->fib_index_by_sw_if_index[sw_if_index];
383 k.sw_if_index = sw_if_index;
384 k.ip4_address = a->ip4;
385 k.fib_index = fib_index;
387 p = mhash_get (&am->ip4_entry_by_key, &k);
390 e = pool_elt_at_index (am->ip4_entry_pool, p[0]);
392 /* Refuse to over-write static arp. */
393 if (e->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC)
395 make_new_arp_cache_entry = 0;
398 /* Note: always install the route. It might have been deleted */
399 memset(&adj, 0, sizeof(adj));
400 adj.lookup_next_index = IP_LOOKUP_NEXT_REWRITE;
402 vnet_rewrite_for_sw_interface
404 VNET_L3_PACKET_TYPE_IP4,
406 ip4_rewrite_node.index,
407 a->ethernet, /* destination address */
409 sizeof (adj.rewrite_data));
411 /* result of this lookup should be next-hop adjacency */
412 adj_index = ip4_fib_lookup_with_table (im, fib_index, &a->ip4, 0);
413 existing_adj = ip_get_adjacency(lm, adj_index);
415 if (existing_adj->lookup_next_index == IP_LOOKUP_NEXT_ARP &&
416 existing_adj->arp.next_hop.ip4.as_u32 == a->ip4.as_u32)
419 u32 * adjs = vec_dup(e->adjacencies);
420 /* Update all adj assigned to this arp entry */
421 vec_foreach(ai, adjs)
424 ip_adjacency_t * uadj = ip_get_adjacency(lm, *ai);
425 for (i = 0; i < uadj->n_adj; i++)
426 if (uadj[i].lookup_next_index == IP_LOOKUP_NEXT_ARP &&
427 uadj[i].arp.next_hop.ip4.as_u32 == a->ip4.as_u32)
428 ip_update_adjacency (lm, *ai + i, &adj);
435 args.table_index_or_table_id = fib_index;
436 args.flags = IP4_ROUTE_FLAG_FIB_INDEX | IP4_ROUTE_FLAG_ADD | IP4_ROUTE_FLAG_NEIGHBOR;
437 args.dst_address = a->ip4;
438 args.dst_address_length = 32;
442 ip4_add_del_route (im, &args);
445 if (make_new_arp_cache_entry)
447 pool_get (am->ip4_entry_pool, e);
448 mhash_set (&am->ip4_entry_by_key, &k,
449 e - am->ip4_entry_pool,
454 /* Update time stamp and ethernet address. */
455 clib_memcpy (e->ethernet_address, a->ethernet, sizeof (e->ethernet_address));
456 e->cpu_time_last_updated = clib_cpu_time_now ();
458 e->flags |= ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC;
460 /* Customer(s) waiting for this address to be resolved? */
461 p = hash_get (am->pending_resolutions_by_address, a->ip4.as_u32);
466 while (next_index != (u32)~0)
468 pr = pool_elt_at_index (am->pending_resolutions, next_index);
469 vlib_process_signal_event (vm, pr->node_index,
472 next_index = pr->next_index;
473 pool_put (am->pending_resolutions, pr);
476 hash_unset (am->pending_resolutions_by_address, a->ip4.as_u32);
479 /* Customer(s) requesting ARP event for this address? */
480 p = hash_get (am->mac_changes_by_address, a->ip4.as_u32);
485 while (next_index != (u32)~0)
487 int (*fp)(u32, u8 *, u32, u32);
489 mc = pool_elt_at_index (am->mac_changes, next_index);
490 fp = mc->data_callback;
492 /* Call the user's data callback, return 1 to suppress dup events */
494 rv = (*fp)(mc->data, a->ethernet, sw_if_index, 0);
497 * Signal the resolver process, as long as the user
498 * says they want to be notified
501 vlib_process_signal_event (vm, mc->node_index,
504 next_index = mc->next_index;
511 void vnet_register_ip4_arp_resolution_event (vnet_main_t * vnm,
517 ethernet_arp_main_t * am = ðernet_arp_main;
518 ip4_address_t * address = address_arg;
520 pending_resolution_t * pr;
522 pool_get (am->pending_resolutions, pr);
525 pr->node_index = node_index;
526 pr->type_opaque = type_opaque;
528 pr->data_callback = 0;
530 p = hash_get (am->pending_resolutions_by_address, address->as_u32);
533 /* Insert new resolution at the head of the list */
534 pr->next_index = p[0];
535 hash_unset (am->pending_resolutions_by_address, address->as_u32);
538 hash_set (am->pending_resolutions_by_address, address->as_u32,
539 pr - am->pending_resolutions);
542 int vnet_add_del_ip4_arp_change_event (vnet_main_t * vnm,
543 void * data_callback,
548 uword data, int is_add)
550 ethernet_arp_main_t * am = ðernet_arp_main;
551 ip4_address_t * address = address_arg;
553 pending_resolution_t * mc;
554 void (*fp)(u32, u8 *) = data_callback;
558 pool_get (am->mac_changes, mc);
561 mc->node_index = node_index;
562 mc->type_opaque = type_opaque;
564 mc->data_callback = data_callback;
567 p = hash_get (am->mac_changes_by_address, address->as_u32);
570 /* Insert new resolution at the head of the list */
571 mc->next_index = p[0];
572 hash_unset (am->mac_changes_by_address, address->as_u32);
575 hash_set (am->mac_changes_by_address, address->as_u32,
576 mc - am->mac_changes);
582 pending_resolution_t * mc_last = 0;
584 p = hash_get (am->mac_changes_by_address, address->as_u32);
586 return VNET_API_ERROR_NO_SUCH_ENTRY;
590 while (index != (u32)~0)
592 mc = pool_elt_at_index (am->mac_changes, index);
593 if (mc->node_index == node_index &&
594 mc->type_opaque == type_opaque &&
597 /* Clients may need to clean up pool entries, too */
599 (*fp)(mc->data, 0 /* no new mac addrs */);
602 hash_unset (am->mac_changes_by_address, address->as_u32);
603 if (mc->next_index != ~0)
604 hash_set (am->mac_changes_by_address, address->as_u32,
606 pool_put (am->mac_changes, mc);
612 mc_last->next_index = mc->next_index;
613 pool_put (am->mac_changes, mc);
618 index = mc->next_index;
621 return VNET_API_ERROR_NO_SUCH_ENTRY;
625 /* Either we drop the packet or we send a reply to the sender. */
628 ARP_INPUT_NEXT_REPLY_TX,
632 #define foreach_ethernet_arp_error \
633 _ (replies_sent, "ARP replies sent") \
634 _ (l2_type_not_ethernet, "L2 type not ethernet") \
635 _ (l3_type_not_ip4, "L3 type not IP4") \
636 _ (l3_src_address_not_local, "IP4 source address not local to subnet") \
637 _ (l3_dst_address_not_local, "IP4 destination address not local to subnet") \
638 _ (l3_src_address_is_local, "IP4 source address matches local interface") \
639 _ (l3_src_address_learned, "ARP request IP4 source address learned") \
640 _ (replies_received, "ARP replies received") \
641 _ (opcode_not_request, "ARP opcode not request") \
642 _ (proxy_arp_replies_sent, "Proxy ARP replies sent") \
643 _ (l2_address_mismatch, "ARP hw addr does not match L2 frame src addr") \
644 _ (missing_interface_address, "ARP missing interface address") \
645 _ (gratuitous_arp, "ARP probe or announcement dropped") \
648 #define _(sym,string) ETHERNET_ARP_ERROR_##sym,
649 foreach_ethernet_arp_error
651 ETHERNET_ARP_N_ERROR,
652 } ethernet_arp_input_error_t;
654 /* get first interface address */
656 ip4_interface_first_address (ip4_main_t * im, u32 sw_if_index,
657 ip_interface_address_t ** result_ia)
659 ip_lookup_main_t * lm = &im->lookup_main;
660 ip_interface_address_t * ia = 0;
661 ip4_address_t * result = 0;
663 foreach_ip_interface_address (lm, ia, sw_if_index,
664 1 /* honor unnumbered */,
666 ip4_address_t * a = ip_interface_address_get_address (lm, ia);
671 *result_ia = result ? ia : 0;
675 static void unset_random_arp_entry (void)
677 ethernet_arp_main_t * am = ðernet_arp_main;
678 ethernet_arp_ip4_entry_t * e;
679 vnet_main_t * vnm = vnet_get_main();
680 ethernet_arp_ip4_over_ethernet_address_t delme;
683 index = pool_next_index (am->ip4_entry_pool, am->arp_delete_rotor);
684 am->arp_delete_rotor = index;
686 /* Try again from elt 0, could happen if an intfc goes down */
689 index = pool_next_index (am->ip4_entry_pool, am->arp_delete_rotor);
690 am->arp_delete_rotor = index;
693 /* Nothing left in the pool */
697 e = pool_elt_at_index (am->ip4_entry_pool, index);
699 clib_memcpy (&delme.ethernet, e->ethernet_address, 6);
700 delme.ip4.as_u32 = e->key.ip4_address.as_u32;
702 vnet_arp_unset_ip4_over_ethernet (vnm, e->key.sw_if_index,
703 e->key.fib_index, &delme);
706 static void arp_unnumbered (vlib_buffer_t * p0,
708 ethernet_header_t * eth0,
709 ip_interface_address_t * ifa0)
711 vlib_main_t * vm = vlib_get_main();
712 vnet_main_t * vnm = vnet_get_main();
713 vnet_interface_main_t * vim = &vnm->interface_main;
714 vnet_sw_interface_t * si;
715 vnet_hw_interface_t * hi;
716 u32 unnum_src_sw_if_index;
717 u32 * broadcast_swifs = 0;
722 u8 dst_mac_address[6];
724 ethernet_arp_header_t * arp0;
726 /* Save the dst mac address */
727 clib_memcpy(dst_mac_address, eth0->dst_address, sizeof (dst_mac_address));
729 /* Figure out which sw_if_index supplied the address */
730 unnum_src_sw_if_index = ifa0->sw_if_index;
732 /* Track down all users of the unnumbered source */
733 pool_foreach (si, vim->sw_interfaces,
735 if (si->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED &&
736 (si->unnumbered_sw_if_index == unnum_src_sw_if_index))
738 vec_add1 (broadcast_swifs, si->sw_if_index);
743 ASSERT (vec_len(broadcast_swifs));
745 /* Allocate buffering if we need it */
746 if (vec_len(broadcast_swifs) > 1)
748 vec_validate (buffers, vec_len(broadcast_swifs)-2);
749 n_alloc = vlib_buffer_alloc (vm, buffers, vec_len(buffers));
750 _vec_len (buffers) = n_alloc;
751 for (i = 0; i < n_alloc; i++)
753 b0 = vlib_get_buffer (vm, buffers[i]);
755 /* xerox (partially built) ARP pkt */
756 clib_memcpy (b0->data, p0->data, p0->current_length + p0->current_data);
757 b0->current_data = p0->current_data;
758 b0->current_length = p0->current_length;
759 vnet_buffer(b0)->sw_if_index[VLIB_RX] =
760 vnet_buffer(p0)->sw_if_index[VLIB_RX];
764 vec_insert (buffers, 1, 0);
767 for (i = 0; i < vec_len(buffers); i++)
769 b0 = vlib_get_buffer(vm, buffers[i]);
770 arp0 = vlib_buffer_get_current (b0);
772 hi = vnet_get_sup_hw_interface (vnm, broadcast_swifs[i]);
773 si = vnet_get_sw_interface (vnm, broadcast_swifs[i]);
775 /* For decoration, most likely */
776 vnet_buffer(b0)->sw_if_index[VLIB_TX] = hi->sw_if_index;
778 /* Fix ARP pkt src address */
779 clib_memcpy (arp0->ip4_over_ethernet[0].ethernet, hi->hw_address, 6);
781 /* Build L2 encaps for this swif */
782 header_size = sizeof (ethernet_header_t);
783 if (si->sub.eth.flags.one_tag)
785 else if (si->sub.eth.flags.two_tags)
788 vlib_buffer_advance (b0, -header_size);
789 eth0 = vlib_buffer_get_current (b0);
791 if (si->sub.eth.flags.one_tag) {
792 ethernet_vlan_header_t * outer = (void *) (eth0 + 1);
794 eth0->type = si->sub.eth.flags.dot1ad ?
795 clib_host_to_net_u16 (ETHERNET_TYPE_DOT1AD) :
796 clib_host_to_net_u16 (ETHERNET_TYPE_VLAN);
797 outer->priority_cfi_and_id =
798 clib_host_to_net_u16 (si->sub.eth.outer_vlan_id);
799 outer->type = clib_host_to_net_u16 (ETHERNET_TYPE_ARP);
801 } else if (si->sub.eth.flags.two_tags) {
802 ethernet_vlan_header_t * outer = (void *) (eth0 + 1);
803 ethernet_vlan_header_t * inner = (void *) (outer + 1);
805 eth0->type = si->sub.eth.flags.dot1ad ?
806 clib_host_to_net_u16 (ETHERNET_TYPE_DOT1AD) :
807 clib_host_to_net_u16 (ETHERNET_TYPE_VLAN);
808 outer->priority_cfi_and_id =
809 clib_host_to_net_u16 (si->sub.eth.outer_vlan_id);
810 outer->type = clib_host_to_net_u16 (ETHERNET_TYPE_VLAN);
811 inner->priority_cfi_and_id =
812 clib_host_to_net_u16 (si->sub.eth.inner_vlan_id);
813 inner->type = clib_host_to_net_u16 (ETHERNET_TYPE_ARP);
816 eth0->type = clib_host_to_net_u16 (ETHERNET_TYPE_ARP);
819 /* Restore the original dst address, set src address */
820 clib_memcpy (eth0->dst_address, dst_mac_address, sizeof (eth0->dst_address));
821 clib_memcpy (eth0->src_address, hi->hw_address, sizeof (eth0->src_address));
823 /* Transmit replicas */
826 vlib_frame_t * f = vlib_get_frame_to_node (vm, hi->output_node_index);
827 u32 * to_next = vlib_frame_vector_args (f);
828 to_next[0] = buffers[i];
830 vlib_put_frame_to_node (vm, hi->output_node_index, f);
834 /* The regular path outputs the original pkt.. */
835 vnet_buffer (p0)->sw_if_index[VLIB_TX] = broadcast_swifs[0];
837 vec_free (broadcast_swifs);
842 arp_input (vlib_main_t * vm,
843 vlib_node_runtime_t * node,
844 vlib_frame_t * frame)
846 ethernet_arp_main_t * am = ðernet_arp_main;
847 vnet_main_t * vnm = vnet_get_main();
848 ip4_main_t * im4 = &ip4_main;
849 u32 n_left_from, next_index, * from, * to_next;
850 u32 n_replies_sent = 0, n_proxy_arp_replies_sent = 0;
852 from = vlib_frame_vector_args (frame);
853 n_left_from = frame->n_vectors;
854 next_index = node->cached_next_index;
856 if (node->flags & VLIB_NODE_FLAG_TRACE)
857 vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
859 sizeof (ethernet_arp_input_trace_t));
861 while (n_left_from > 0)
865 vlib_get_next_frame (vm, node, next_index,
866 to_next, n_left_to_next);
868 while (n_left_from > 0 && n_left_to_next > 0)
871 vnet_hw_interface_t * hw_if0;
872 ethernet_arp_header_t * arp0;
873 ethernet_header_t * eth0;
874 ip_interface_address_t * ifa0;
875 ip_adjacency_t * adj0;
876 ip4_address_t * if_addr0;
877 ip4_address_t proxy_src;
878 u32 pi0, error0, next0, sw_if_index0;
879 u8 is_request0, src_is_local0, dst_is_local0, is_unnum0;
880 ethernet_proxy_arp_t * pa;
889 p0 = vlib_get_buffer (vm, pi0);
890 arp0 = vlib_buffer_get_current (p0);
892 is_request0 = arp0->opcode
893 == clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_request);
895 error0 = ETHERNET_ARP_ERROR_replies_sent;
897 error0 = (arp0->l2_type != clib_net_to_host_u16 (ETHERNET_ARP_HARDWARE_TYPE_ethernet)
898 ? ETHERNET_ARP_ERROR_l2_type_not_ethernet
900 error0 = (arp0->l3_type != clib_net_to_host_u16 (ETHERNET_TYPE_IP4)
901 ? ETHERNET_ARP_ERROR_l3_type_not_ip4
904 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
909 /* Check that IP address is local and matches incoming interface. */
910 if_addr0 = ip4_interface_address_matching_destination (im4,
911 &arp0->ip4_over_ethernet[1].ip4,
916 error0 = ETHERNET_ARP_ERROR_l3_dst_address_not_local;
920 /* Honor unnumbered interface, if any */
921 is_unnum0 = sw_if_index0 != ifa0->sw_if_index;
923 /* Source must also be local to subnet of matching interface address. */
924 if (! ip4_destination_matches_interface (im4, &arp0->ip4_over_ethernet[0].ip4, ifa0))
926 error0 = ETHERNET_ARP_ERROR_l3_src_address_not_local;
930 /* Reject requests/replies with our local interface address. */
931 src_is_local0 = if_addr0->as_u32 == arp0->ip4_over_ethernet[0].ip4.as_u32;
934 error0 = ETHERNET_ARP_ERROR_l3_src_address_is_local;
938 dst_is_local0 = if_addr0->as_u32 == arp0->ip4_over_ethernet[1].ip4.as_u32;
940 /* Fill in ethernet header. */
941 eth0 = ethernet_buffer_get_header (p0);
943 /* Trash ARP packets whose ARP-level source addresses do not
944 match their L2-frame-level source addresses */
945 if (memcmp (eth0->src_address, arp0->ip4_over_ethernet[0].ethernet,
946 sizeof (eth0->src_address)))
948 error0 = ETHERNET_ARP_ERROR_l2_address_mismatch;
952 /* Learn or update sender's mapping only for requests or unicasts
953 that don't match local interface address. */
954 if (ethernet_address_cast (eth0->dst_address) == ETHERNET_ADDRESS_UNICAST
957 if (am->limit_arp_cache_size &&
958 pool_elts (am->ip4_entry_pool) >= am->limit_arp_cache_size)
959 unset_random_arp_entry();
961 vnet_arp_set_ip4_over_ethernet (vnm, sw_if_index0,
962 (u32)~0 /* default fib */,
963 &arp0->ip4_over_ethernet[0],
965 error0 = ETHERNET_ARP_ERROR_l3_src_address_learned;
968 /* Only send a reply for requests sent which match a local interface. */
969 if (! (is_request0 && dst_is_local0))
971 error0 = (arp0->opcode == clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply)
972 ? ETHERNET_ARP_ERROR_replies_received : error0);
978 vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
979 hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
981 /* Send reply back through input interface */
982 vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
983 next0 = ARP_INPUT_NEXT_REPLY_TX;
985 arp0->opcode = clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply);
987 arp0->ip4_over_ethernet[1] = arp0->ip4_over_ethernet[0];
989 clib_memcpy (arp0->ip4_over_ethernet[0].ethernet, hw_if0->hw_address, 6);
990 clib_mem_unaligned (&arp0->ip4_over_ethernet[0].ip4.data_u32, u32) = if_addr0->data_u32;
992 /* Hardware must be ethernet-like. */
993 ASSERT (vec_len (hw_if0->hw_address) == 6);
995 clib_memcpy (eth0->dst_address, eth0->src_address, 6);
996 clib_memcpy (eth0->src_address, hw_if0->hw_address, 6);
998 /* Figure out how much to rewind current data from adjacency. */
1001 adj0 = ip_get_adjacency (&ip4_main.lookup_main,
1002 ifa0->neighbor_probe_adj_index);
1003 if (adj0->lookup_next_index != IP_LOOKUP_NEXT_ARP)
1005 error0 = ETHERNET_ARP_ERROR_missing_interface_address;
1009 arp_unnumbered (p0, pi0, eth0, ifa0);
1011 vlib_buffer_advance (p0, -adj0->rewrite_header.data_bytes);
1014 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,to_next,
1015 n_left_to_next,pi0,next0);
1017 n_replies_sent += 1;
1021 if (0 == arp0->ip4_over_ethernet[0].ip4.as_u32 ||
1022 (arp0->ip4_over_ethernet[0].ip4.as_u32 ==
1023 arp0->ip4_over_ethernet[1].ip4.as_u32))
1025 error0 = ETHERNET_ARP_ERROR_gratuitous_arp;
1028 /* See if proxy arp is configured for the address */
1031 vnet_sw_interface_t * si;
1032 u32 this_addr = clib_net_to_host_u32
1033 (arp0->ip4_over_ethernet[1].ip4.as_u32);
1036 si = vnet_get_sw_interface (vnm, sw_if_index0);
1038 if (!(si->flags & VNET_SW_INTERFACE_FLAG_PROXY_ARP))
1041 fib_index0 = vec_elt (im4->fib_index_by_sw_if_index,
1044 vec_foreach (pa, am->proxy_arps)
1046 u32 lo_addr = clib_net_to_host_u32 (pa->lo_addr);
1047 u32 hi_addr = clib_net_to_host_u32 (pa->hi_addr);
1049 /* an ARP request hit in the proxy-arp table? */
1050 if ((this_addr >= lo_addr && this_addr <= hi_addr) &&
1051 (fib_index0 == pa->fib_index))
1053 eth0 = ethernet_buffer_get_header (p0);
1055 arp0->ip4_over_ethernet[1].ip4.data_u32;
1058 * Rewind buffer, direct code above not to
1059 * think too hard about it.
1060 * $$$ is the answer ever anything other than
1061 * vlib_buffer_reset(..)?
1064 if_addr0 = &proxy_src;
1065 vlib_buffer_reset (p0);
1066 n_proxy_arp_replies_sent++;
1074 next0 = ARP_INPUT_NEXT_DROP;
1075 p0->error = node->errors[error0];
1077 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,to_next,
1078 n_left_to_next,pi0,next0);
1081 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1084 vlib_error_count (vm, node->node_index,
1085 ETHERNET_ARP_ERROR_replies_sent,
1086 n_replies_sent - n_proxy_arp_replies_sent);
1088 vlib_error_count (vm, node->node_index,
1089 ETHERNET_ARP_ERROR_proxy_arp_replies_sent,
1090 n_proxy_arp_replies_sent);
1091 return frame->n_vectors;
1094 static char * ethernet_arp_error_strings[] = {
1095 #define _(sym,string) string,
1096 foreach_ethernet_arp_error
1100 VLIB_REGISTER_NODE (arp_input_node,static) = {
1101 .function = arp_input,
1102 .name = "arp-input",
1103 .vector_size = sizeof (u32),
1105 .n_errors = ETHERNET_ARP_N_ERROR,
1106 .error_strings = ethernet_arp_error_strings,
1108 .n_next_nodes = ARP_INPUT_N_NEXT,
1110 [ARP_INPUT_NEXT_DROP] = "error-drop",
1111 [ARP_INPUT_NEXT_REPLY_TX] = "interface-output",
1114 .format_buffer = format_ethernet_arp_header,
1115 .format_trace = format_ethernet_arp_input_trace,
1119 ip4_arp_entry_sort (void *a1, void *a2)
1121 ethernet_arp_ip4_entry_t * e1 = a1;
1122 ethernet_arp_ip4_entry_t * e2 = a2;
1125 vnet_main_t * vnm = vnet_get_main();
1127 cmp = vnet_sw_interface_compare
1128 (vnm, e1->key.sw_if_index, e2->key.sw_if_index);
1130 cmp = ip4_address_compare (&e1->key.ip4_address, &e2->key.ip4_address);
1134 static clib_error_t *
1135 show_ip4_arp (vlib_main_t * vm,
1136 unformat_input_t * input,
1137 vlib_cli_command_t * cmd)
1139 vnet_main_t * vnm = vnet_get_main();
1140 ethernet_arp_main_t * am = ðernet_arp_main;
1141 ethernet_arp_ip4_entry_t * e, * es;
1142 ethernet_proxy_arp_t * pa;
1143 clib_error_t * error = 0;
1146 /* Filter entries by interface if given. */
1148 (void) unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index);
1151 pool_foreach (e, am->ip4_entry_pool, ({ vec_add1 (es, e[0]); }));
1154 vec_sort_with_function (es, ip4_arp_entry_sort);
1155 vlib_cli_output (vm, "%U", format_ethernet_arp_ip4_entry, vnm, 0);
1156 vec_foreach (e, es) {
1157 if (sw_if_index != ~0 && e->key.sw_if_index != sw_if_index)
1159 vlib_cli_output (vm, "%U", format_ethernet_arp_ip4_entry, vnm, e);
1164 if (vec_len (am->proxy_arps))
1166 vlib_cli_output (vm, "Proxy arps enabled for:");
1167 vec_foreach(pa, am->proxy_arps)
1169 vlib_cli_output (vm, "Fib_index %d %U - %U ",
1171 format_ip4_address, &pa->lo_addr,
1172 format_ip4_address, &pa->hi_addr);
1179 VLIB_CLI_COMMAND (show_ip4_arp_command, static) = {
1180 .path = "show ip arp",
1181 .function = show_ip4_arp,
1182 .short_help = "Show ARP table",
1186 pg_edit_t l2_type, l3_type;
1187 pg_edit_t n_l2_address_bytes, n_l3_address_bytes;
1192 } ip4_over_ethernet[2];
1193 } pg_ethernet_arp_header_t;
1196 pg_ethernet_arp_header_init (pg_ethernet_arp_header_t * p)
1198 /* Initialize fields that are not bit fields in the IP header. */
1199 #define _(f) pg_edit_init (&p->f, ethernet_arp_header_t, f);
1202 _ (n_l2_address_bytes);
1203 _ (n_l3_address_bytes);
1205 _ (ip4_over_ethernet[0].ethernet);
1206 _ (ip4_over_ethernet[0].ip4);
1207 _ (ip4_over_ethernet[1].ethernet);
1208 _ (ip4_over_ethernet[1].ip4);
1213 unformat_pg_arp_header (unformat_input_t * input, va_list * args)
1215 pg_stream_t * s = va_arg (*args, pg_stream_t *);
1216 pg_ethernet_arp_header_t * p;
1219 p = pg_create_edit_group (s, sizeof (p[0]), sizeof (ethernet_arp_header_t),
1221 pg_ethernet_arp_header_init (p);
1224 pg_edit_set_fixed (&p->l2_type, ETHERNET_ARP_HARDWARE_TYPE_ethernet);
1225 pg_edit_set_fixed (&p->l3_type, ETHERNET_TYPE_IP4);
1226 pg_edit_set_fixed (&p->n_l2_address_bytes, 6);
1227 pg_edit_set_fixed (&p->n_l3_address_bytes, 4);
1229 if (! unformat (input, "%U: %U/%U -> %U/%U",
1231 unformat_ethernet_arp_opcode_net_byte_order, &p->opcode,
1233 unformat_ethernet_address, &p->ip4_over_ethernet[0].ethernet,
1235 unformat_ip4_address, &p->ip4_over_ethernet[0].ip4,
1237 unformat_ethernet_address, &p->ip4_over_ethernet[1].ethernet,
1239 unformat_ip4_address, &p->ip4_over_ethernet[1].ip4))
1241 /* Free up any edits we may have added. */
1242 pg_free_edit_group (s);
1248 clib_error_t *ip4_set_arp_limit (u32 arp_limit)
1250 ethernet_arp_main_t * am = ðernet_arp_main;
1252 am->limit_arp_cache_size = arp_limit;
1257 arp_ip4_entry_del_adj(ethernet_arp_ip4_entry_t *e, u32 adj_index)
1264 vec_foreach_index(i, e->adjacencies)
1265 if (vec_elt(e->adjacencies, i) == adj_index)
1267 vec_del1(e->adjacencies, i);
1275 arp_ip4_entry_add_adj(ethernet_arp_ip4_entry_t *e, u32 adj_index)
1278 vec_foreach_index(i, e->adjacencies)
1279 if (vec_elt(e->adjacencies, i) == adj_index)
1281 vec_add1(e->adjacencies, adj_index);
1285 arp_add_del_adj_cb (struct ip_lookup_main_t * lm,
1287 ip_adjacency_t * adj,
1290 ethernet_arp_main_t * am = ðernet_arp_main;
1291 ip4_main_t * im = &ip4_main;
1292 ethernet_arp_ip4_key_t k;
1293 ethernet_arp_ip4_entry_t * e = 0;
1297 for(ai = adj->heap_handle; ai < adj->heap_handle + adj->n_adj ; ai++)
1299 adj = ip_get_adjacency (lm, ai);
1300 if (adj->lookup_next_index == IP_LOOKUP_NEXT_ARP && adj->arp.next_hop.ip4.as_u32)
1302 k.sw_if_index = adj->rewrite_header.sw_if_index;
1303 k.ip4_address.as_u32 = adj->arp.next_hop.ip4.as_u32;
1304 k.fib_index = im->fib_index_by_sw_if_index[adj->rewrite_header.sw_if_index];
1305 p = mhash_get (&am->ip4_entry_by_key, &k);
1307 e = pool_elt_at_index (am->ip4_entry_pool, p[0]);
1315 clib_warning("Adjacency contains unknown ARP next hop %U (del)",
1316 format_ip4_address, &adj->arp.next_hop);
1318 arp_ip4_entry_del_adj(e, adj->heap_handle);
1323 clib_warning("Adjacency contains unknown ARP next hop %U (add)",
1324 format_ip4_address, &adj->arp.next_hop);
1326 arp_ip4_entry_add_adj(e, adj->heap_handle);
1331 static clib_error_t * ethernet_arp_init (vlib_main_t * vm)
1333 ethernet_arp_main_t * am = ðernet_arp_main;
1335 clib_error_t * error;
1336 ip4_main_t * im = &ip4_main;
1337 ip_lookup_main_t * lm = &im->lookup_main;
1339 if ((error = vlib_call_init_function (vm, ethernet_init)))
1342 ethernet_register_input_type (vm, ETHERNET_TYPE_ARP, arp_input_node.index);
1344 pn = pg_get_node (arp_input_node.index);
1345 pn->unformat_edit = unformat_pg_arp_header;
1347 am->opcode_by_name = hash_create_string (0, sizeof (uword));
1348 #define _(o) hash_set_mem (am->opcode_by_name, #o, ETHERNET_ARP_OPCODE_##o);
1349 foreach_ethernet_arp_opcode;
1352 mhash_init (&am->ip4_entry_by_key,
1353 /* value size */ sizeof (uword),
1354 /* key size */ sizeof (ethernet_arp_ip4_key_t));
1356 /* $$$ configurable */
1357 am->limit_arp_cache_size = 50000;
1359 am->pending_resolutions_by_address = hash_create (0, sizeof (uword));
1360 am->mac_changes_by_address = hash_create (0, sizeof (uword));
1362 /* don't trace ARP error packets */
1364 vlib_node_runtime_t *rt =
1365 vlib_node_get_runtime (vm, arp_input_node.index);
1368 vnet_pcap_drop_trace_filter_add_del \
1369 (rt->errors[ETHERNET_ARP_ERROR_##a], \
1371 foreach_ethernet_arp_error
1375 ip_register_add_del_adjacency_callback(lm, arp_add_del_adj_cb);
1380 VLIB_INIT_FUNCTION (ethernet_arp_init);
1383 vnet_arp_unset_ip4_over_ethernet (vnet_main_t * vnm,
1384 u32 sw_if_index, u32 fib_index,
1387 ethernet_arp_ip4_over_ethernet_address_t * a = a_arg;
1388 vnet_arp_set_ip4_over_ethernet_rpc_args_t args;
1390 args.sw_if_index = sw_if_index;
1391 args.fib_index = fib_index;
1393 clib_memcpy (&args.a, a, sizeof (*a));
1395 vl_api_rpc_call_main_thread (set_ip4_over_ethernet_rpc_callback,
1396 (u8 *) &args, sizeof (args));
1401 vnet_arp_unset_ip4_over_ethernet_internal (vnet_main_t * vnm,
1406 ethernet_arp_ip4_entry_t * e;
1407 ethernet_arp_main_t * am = ðernet_arp_main;
1408 ethernet_arp_ip4_over_ethernet_address_t * a = a_arg;
1409 ethernet_arp_ip4_key_t k;
1411 ip4_add_del_route_args_t args;
1412 ip4_main_t * im = &ip4_main;
1413 ip_lookup_main_t * lm = &im->lookup_main;
1415 ip_adjacency_t * adj;
1417 k.sw_if_index = sw_if_index;
1418 k.ip4_address = a->ip4;
1419 k.fib_index = fib_index;
1420 p = mhash_get (&am->ip4_entry_by_key, &k);
1424 memset(&args, 0, sizeof(args));
1427 * Make sure that the route actually exists before we try to delete it,
1428 * and make sure that it's a rewrite adjacency.
1430 * If we point 1-N unnumbered interfaces at a loopback interface and
1431 * shut down the loopback before shutting down 1-N unnumbered
1432 * interfaces, the ARP cache will still have an entry,
1433 * but the route will have disappeared.
1435 * See also ip4_del_interface_routes (...)
1436 * -> ip4_delete_matching_routes (...).
1439 adj_index = ip4_fib_lookup_with_table
1440 (im, fib_index, &a->ip4, 1 /* disable default route */);
1442 /* Miss adj? Forget it... */
1443 if (adj_index != lm->miss_adj_index) {
1444 adj = ip_get_adjacency (lm, adj_index);
1446 * Stupid control-plane trick:
1447 * admin down an interface (removes arp routes from fib),
1448 * bring the interface back up (does not reinstall them)
1449 * then remove the arp cache entry (yuck). When that happens,
1450 * the adj we find here will be the interface subnet ARP adj.
1452 if (adj->lookup_next_index == IP_LOOKUP_NEXT_REWRITE) {
1453 args.table_index_or_table_id = fib_index;
1454 args.flags = IP4_ROUTE_FLAG_FIB_INDEX | IP4_ROUTE_FLAG_DEL
1455 | IP4_ROUTE_FLAG_NEIGHBOR;
1456 args.dst_address = a->ip4;
1457 args.dst_address_length = 32;
1458 ip4_add_del_route (im, &args);
1459 ip4_maybe_remap_adjacencies (im, fib_index, args.flags);
1463 e = pool_elt_at_index (am->ip4_entry_pool, p[0]);
1464 mhash_unset (&am->ip4_entry_by_key, &e->key, 0);
1465 pool_put (am->ip4_entry_pool, e);
1470 increment_ip4_and_mac_address (ethernet_arp_ip4_over_ethernet_address_t *a)
1475 for (i = 3; i >= 0; i--)
1477 old = a->ip4.as_u8[i];
1478 a->ip4.as_u8[i] += 1;
1479 if (old < a->ip4.as_u8[i])
1483 for (i = 5; i >= 0; i--)
1485 old = a->ethernet[i];
1486 a->ethernet[i] += 1;
1487 if (old < a->ethernet[i])
1492 int vnet_proxy_arp_add_del (ip4_address_t *lo_addr,
1493 ip4_address_t *hi_addr,
1494 u32 fib_index, int is_del)
1496 ethernet_arp_main_t *am = ðernet_arp_main;
1497 ethernet_proxy_arp_t *pa;
1498 u32 found_at_index = ~0;
1500 vec_foreach (pa, am->proxy_arps)
1502 if (pa->lo_addr == lo_addr->as_u32
1503 && pa->hi_addr == hi_addr->as_u32
1504 && pa->fib_index == fib_index)
1506 found_at_index = pa - am->proxy_arps;
1511 if (found_at_index != ~0)
1513 /* Delete, otherwise it's already in the table */
1515 vec_delete (am->proxy_arps, 1, found_at_index);
1518 /* delete, no such entry */
1520 return VNET_API_ERROR_NO_SUCH_ENTRY;
1522 /* add, not in table */
1523 vec_add2 (am->proxy_arps, pa, 1);
1524 pa->lo_addr = lo_addr->as_u32;
1525 pa->hi_addr = hi_addr->as_u32;
1526 pa->fib_index = fib_index;
1531 * Remove any proxy arp entries asdociated with the
1534 int vnet_proxy_arp_fib_reset (u32 fib_id)
1536 ip4_main_t * im = &ip4_main;
1537 ethernet_arp_main_t *am = ðernet_arp_main;
1538 ethernet_proxy_arp_t *pa;
1539 u32 * entries_to_delete = 0;
1544 p = hash_get (im->fib_index_by_table_id, fib_id);
1546 return VNET_API_ERROR_NO_SUCH_ENTRY;
1549 vec_foreach (pa, am->proxy_arps)
1551 if (pa->fib_index == fib_index)
1553 vec_add1 (entries_to_delete, pa - am->proxy_arps);
1557 for (i = 0; i < vec_len(entries_to_delete); i++)
1559 vec_delete (am->proxy_arps, 1, entries_to_delete[i]);
1562 vec_free (entries_to_delete);
1568 vnet_arp_glean_add(u32 fib_index, void * next_hop_arg)
1570 ethernet_arp_main_t * am = ðernet_arp_main;
1571 ip4_main_t * im = &ip4_main;
1572 ip_lookup_main_t * lm = &im->lookup_main;
1573 ip4_address_t * next_hop = next_hop_arg;
1574 ip_adjacency_t add_adj, *adj;
1575 ip4_add_del_route_args_t args;
1576 ethernet_arp_ip4_entry_t * e;
1577 ethernet_arp_ip4_key_t k;
1580 adj_index = ip4_fib_lookup_with_table(im, fib_index, next_hop, 0);
1581 adj = ip_get_adjacency(lm, adj_index);
1583 if (!adj || adj->lookup_next_index != IP_LOOKUP_NEXT_ARP)
1586 if (adj->arp.next_hop.ip4.as_u32 != 0)
1589 k.sw_if_index = adj->rewrite_header.sw_if_index;
1590 k.fib_index = fib_index;
1591 k.ip4_address.as_u32 = next_hop->as_u32;
1593 if (mhash_get (&am->ip4_entry_by_key, &k))
1596 pool_get (am->ip4_entry_pool, e);
1597 mhash_set (&am->ip4_entry_by_key, &k, e - am->ip4_entry_pool, /* old value */ 0);
1599 e->cpu_time_last_updated = clib_cpu_time_now ();
1600 e->flags = ETHERNET_ARP_IP4_ENTRY_FLAG_GLEAN;
1602 memset(&args, 0, sizeof(args));
1603 clib_memcpy(&add_adj, adj, sizeof(add_adj));
1604 add_adj.arp.next_hop.ip4.as_u32 = next_hop->as_u32; /* install neighbor /32 route */
1605 args.table_index_or_table_id = fib_index;
1606 args.flags = IP4_ROUTE_FLAG_FIB_INDEX | IP4_ROUTE_FLAG_ADD| IP4_ROUTE_FLAG_NEIGHBOR;
1607 args.dst_address.as_u32 = next_hop->as_u32;
1608 args.dst_address_length = 32;
1609 args.adj_index = ~0;
1610 args.add_adj = &add_adj;
1612 ip4_add_del_route (im, &args);
1613 return ip4_fib_lookup_with_table (im, fib_index, next_hop, 0);
1616 static clib_error_t *
1617 ip_arp_add_del_command_fn (vlib_main_t * vm,
1618 unformat_input_t * input,
1619 vlib_cli_command_t * cmd)
1621 vnet_main_t * vnm = vnet_get_main();
1623 ethernet_arp_ip4_over_ethernet_address_t lo_addr, hi_addr, addr;
1632 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
1634 /* set ip arp TenGigE1/1/0/1 1.2.3.4 aa:bb:... or aabb.ccdd... */
1635 if (unformat (input, "%U %U %U",
1636 unformat_vnet_sw_interface, vnm, &sw_if_index,
1637 unformat_ip4_address, &addr.ip4,
1638 unformat_ethernet_address, &addr.ethernet))
1641 else if (unformat (input, "delete") || unformat (input, "del"))
1644 else if (unformat (input, "static"))
1647 else if (unformat (input, "count %d", &count))
1650 else if (unformat (input, "fib-id %d", &fib_id))
1652 ip4_main_t * im = &ip4_main;
1653 uword * p = hash_get (im->fib_index_by_table_id, fib_id);
1655 return clib_error_return (0, "fib ID %d doesn't exist\n",
1660 else if (unformat (input, "proxy %U - %U",
1661 unformat_ip4_address, &lo_addr.ip4,
1662 unformat_ip4_address, &hi_addr.ip4))
1670 (void) vnet_proxy_arp_add_del (&lo_addr.ip4, &hi_addr.ip4,
1679 for (i = 0; i < count; i++)
1683 uword event_type, * event_data = 0;
1685 /* Park the debug CLI until the arp entry is installed */
1686 vnet_register_ip4_arp_resolution_event
1687 (vnm, &addr.ip4, vlib_current_process(vm),
1688 1 /* type */, 0 /* data */);
1690 vnet_arp_set_ip4_over_ethernet
1691 (vnm, sw_if_index, fib_index, &addr, is_static);
1693 vlib_process_wait_for_event (vm);
1694 event_type = vlib_process_get_events (vm, &event_data);
1695 vec_reset_length(event_data);
1696 if (event_type != 1)
1697 clib_warning ("event type %d unexpected", event_type);
1700 vnet_arp_unset_ip4_over_ethernet
1701 (vnm, sw_if_index, fib_index, &addr);
1703 increment_ip4_and_mac_address (&addr);
1708 return clib_error_return (0, "unknown input `%U'",
1709 format_unformat_error, input);
1715 VLIB_CLI_COMMAND (ip_arp_add_del_command, static) = {
1716 .path = "set ip arp",
1717 .short_help = "set ip arp [del] <intfc> <ip-address> <mac-address>",
1718 .function = ip_arp_add_del_command_fn,
1721 static clib_error_t *
1722 set_int_proxy_arp_command_fn (vlib_main_t * vm,
1723 unformat_input_t * input,
1724 vlib_cli_command_t * cmd)
1726 vnet_main_t * vnm = vnet_get_main();
1728 vnet_sw_interface_t * si;
1732 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
1734 if (unformat (input, "%U", unformat_vnet_sw_interface,
1737 else if (unformat (input, "enable") || unformat (input, "on"))
1739 else if (unformat (input, "disable") || unformat (input, "off"))
1746 return clib_error_return (0, "unknown input '%U'",
1747 format_unformat_error, input);
1749 si = vnet_get_sw_interface (vnm, sw_if_index);
1752 si->flags |= VNET_SW_INTERFACE_FLAG_PROXY_ARP;
1754 si->flags &= ~VNET_SW_INTERFACE_FLAG_PROXY_ARP;
1759 VLIB_CLI_COMMAND (set_int_proxy_enable_command, static) = {
1760 .path = "set interface proxy-arp",
1761 .short_help = "set interface proxy-arp <intfc> [enable|disable]",
1762 .function = set_int_proxy_arp_command_fn,
1767 * ARP Termination in a L2 Bridge Domain based on an
1768 * IP4 to MAC hash table mac_by_ip4 for each BD.
1771 ARP_TERM_NEXT_L2_OUTPUT,
1776 u32 arp_term_next_node_index[32];
1779 arp_term_l2bd (vlib_main_t * vm,
1780 vlib_node_runtime_t * node,
1781 vlib_frame_t * frame)
1783 l2input_main_t * l2im = &l2input_main;
1784 u32 n_left_from, next_index, * from, * to_next;
1785 u32 n_replies_sent = 0;
1786 u16 last_bd_index = ~0;
1787 l2_bridge_domain_t * last_bd_config = 0;
1788 l2_input_config_t * cfg0;
1790 from = vlib_frame_vector_args (frame);
1791 n_left_from = frame->n_vectors;
1792 next_index = node->cached_next_index;
1794 while (n_left_from > 0)
1798 vlib_get_next_frame (vm, node, next_index,
1799 to_next, n_left_to_next);
1801 while (n_left_from > 0 && n_left_to_next > 0)
1804 ethernet_header_t * eth0;
1805 ethernet_arp_header_t * arp0;
1807 u32 pi0, error0, next0, sw_if_index0;
1818 n_left_to_next -= 1;
1820 p0 = vlib_get_buffer (vm, pi0);
1821 eth0 = vlib_buffer_get_current (p0);
1822 l3h0 = (u8 *)eth0 + vnet_buffer(p0)->l2.l2_len;
1823 ethertype0 = clib_net_to_host_u16(*(u16 *)(l3h0 - 2));
1824 arp0 = (ethernet_arp_header_t *) l3h0;
1826 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) &&
1827 (p0->flags & VLIB_BUFFER_IS_TRACED)))
1829 u8 *t0 = vlib_add_trace (
1830 vm, node, p0, sizeof(ethernet_arp_input_trace_t));
1831 clib_memcpy (t0, l3h0, sizeof(ethernet_arp_input_trace_t));
1835 (ethertype0 != ETHERNET_TYPE_ARP) ||
1836 (arp0->opcode != clib_host_to_net_u16(ETHERNET_ARP_OPCODE_request))))
1837 goto next_l2_feature;
1839 error0 = ETHERNET_ARP_ERROR_replies_sent;
1840 error0 = (arp0->l2_type != clib_net_to_host_u16 (ETHERNET_ARP_HARDWARE_TYPE_ethernet)
1841 ? ETHERNET_ARP_ERROR_l2_type_not_ethernet
1843 error0 = (arp0->l3_type != clib_net_to_host_u16 (ETHERNET_TYPE_IP4)
1844 ? ETHERNET_ARP_ERROR_l3_type_not_ip4
1847 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
1852 // Trash ARP packets whose ARP-level source addresses do not
1853 // match their L2-frame-level source addresses */
1855 memcmp (eth0->src_address, arp0->ip4_over_ethernet[0].ethernet,
1856 sizeof (eth0->src_address))))
1858 error0 = ETHERNET_ARP_ERROR_l2_address_mismatch;
1862 // Check if anyone want ARP request events for L2 BDs
1864 pending_resolution_t * mc;
1865 ethernet_arp_main_t * am = ðernet_arp_main;
1866 uword *p = hash_get (am->mac_changes_by_address, 0);
1867 if (p && (vnet_buffer(p0)->l2.shg == 0))
1868 { // Only SHG 0 interface which is more likely local
1869 u32 next_index = p[0];
1870 while (next_index != (u32)~0)
1872 int (*fp)(u32, u8 *, u32, u32);
1874 mc = pool_elt_at_index (am->mac_changes, next_index);
1875 fp = mc->data_callback;
1876 // Call the callback, return 1 to suppress dup events */
1877 if (fp) rv = (*fp)(mc->data,
1878 arp0->ip4_over_ethernet[0].ethernet,
1880 arp0->ip4_over_ethernet[0].ip4.as_u32);
1881 // Signal the resolver process
1883 vlib_process_signal_event (vm, mc->node_index,
1886 next_index = mc->next_index;
1891 // lookup BD mac_by_ip4 hash table for MAC entry
1892 ip0 = arp0->ip4_over_ethernet[1].ip4.as_u32;
1893 bd_index0 = vnet_buffer(p0)->l2.bd_index;
1895 (bd_index0 != last_bd_index) || (last_bd_index == (u16) ~0)))
1897 last_bd_index = bd_index0;
1898 last_bd_config = vec_elt_at_index(l2im->bd_configs, bd_index0);
1900 macp0 = (u8 *) hash_get (last_bd_config->mac_by_ip4, ip0);
1902 if (PREDICT_FALSE(!macp0))
1903 goto next_l2_feature; // MAC not found
1905 // MAC found, send ARP reply -
1906 // Convert ARP request packet to ARP reply
1907 arp0->opcode = clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply);
1908 arp0->ip4_over_ethernet[1] = arp0->ip4_over_ethernet[0];
1909 arp0->ip4_over_ethernet[0].ip4.as_u32 = ip0;
1910 clib_memcpy (arp0->ip4_over_ethernet[0].ethernet, macp0, 6);
1911 clib_memcpy (eth0->dst_address, eth0->src_address, 6);
1912 clib_memcpy (eth0->src_address, macp0, 6);
1913 n_replies_sent += 1;
1915 // For BVI, need to use l2-fwd node to send ARP reply as
1916 // l2-output node cannot output packet to BVI properly
1917 cfg0 = vec_elt_at_index(l2im->configs, sw_if_index0);
1918 if (PREDICT_FALSE (cfg0->bvi))
1920 vnet_buffer(p0)->l2.feature_bitmap |= L2INPUT_FEAT_FWD;
1921 vnet_buffer (p0)->sw_if_index[VLIB_RX] = 0;
1922 goto next_l2_feature;
1925 // Send ARP reply back out input interface through l2-output
1926 vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
1927 next0 = ARP_TERM_NEXT_L2_OUTPUT;
1928 // Note that output to VXLAN tunnel will fail due to SHG which
1929 // is probably desireable since ARP termination is not intended
1930 // for ARP requests from other hosts. If output to VXLAN tunnel is
1931 // required, however, can just clear the SHG in packet as follows:
1932 // vnet_buffer(p0)->l2.shg = 0;
1934 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,to_next,
1935 n_left_to_next,pi0,next0);
1940 u32 feature_bitmap0 =
1941 vnet_buffer(p0)->l2.feature_bitmap & ~L2INPUT_FEAT_ARP_TERM;
1942 vnet_buffer(p0)->l2.feature_bitmap = feature_bitmap0;
1943 next0 = feat_bitmap_get_next_node_index(arp_term_next_node_index,
1945 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,to_next,
1946 n_left_to_next,pi0,next0);
1951 if (0 == arp0->ip4_over_ethernet[0].ip4.as_u32 ||
1952 (arp0->ip4_over_ethernet[0].ip4.as_u32 ==
1953 arp0->ip4_over_ethernet[1].ip4.as_u32))
1955 error0 = ETHERNET_ARP_ERROR_gratuitous_arp;
1957 next0 = ARP_TERM_NEXT_DROP;
1958 p0->error = node->errors[error0];
1960 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,to_next,
1961 n_left_to_next,pi0,next0);
1964 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1967 vlib_error_count (vm, node->node_index,
1968 ETHERNET_ARP_ERROR_replies_sent,
1970 return frame->n_vectors;
1973 VLIB_REGISTER_NODE (arp_term_l2bd_node,static) = {
1974 .function = arp_term_l2bd,
1975 .name = "arp-term-l2bd",
1976 .vector_size = sizeof (u32),
1978 .n_errors = ETHERNET_ARP_N_ERROR,
1979 .error_strings = ethernet_arp_error_strings,
1981 .n_next_nodes = ARP_TERM_N_NEXT,
1983 [ARP_TERM_NEXT_L2_OUTPUT] = "l2-output",
1984 [ARP_TERM_NEXT_DROP] = "error-drop",
1987 .format_buffer = format_ethernet_arp_header,
1988 .format_trace = format_ethernet_arp_input_trace,
1991 clib_error_t *arp_term_init (vlib_main_t *vm)
1992 { // Initialize the feature next-node indexes
1993 feat_bitmap_init_next_nodes(vm,
1994 arp_term_l2bd_node.index,
1996 l2input_get_feat_names(),
1997 arp_term_next_node_index);
2001 VLIB_INIT_FUNCTION (arp_term_init);