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/arp/arp.h>
19 #include <vnet/arp/arp_packet.h>
21 #include <vnet/fib/ip4_fib.h>
22 #include <vnet/fib/fib_entry_src.h>
23 #include <vnet/adj/adj_nbr.h>
24 #include <vnet/adj/adj_mcast.h>
25 #include <vnet/pg/pg.h>
27 #include <vnet/ip-neighbor/ip_neighbor.h>
28 #include <vnet/ip-neighbor/ip_neighbor_dp.h>
30 #include <vlibmemory/api.h>
36 * This file contains code to manage the IPv4 ARP tables (IP Address
37 * to MAC Address lookup).
41 * @brief Per-interface ARP configuration and state
43 typedef struct ethernet_arp_interface_t_
46 * Is ARP enabled on this interface
49 } ethernet_arp_interface_t;
53 /* Hash tables mapping name to opcode. */
54 uword *opcode_by_name;
56 /** Per interface state */
57 ethernet_arp_interface_t *ethernet_arp_by_sw_if_index;
59 /* ARP feature arc index */
61 } ethernet_arp_main_t;
63 static ethernet_arp_main_t ethernet_arp_main;
65 static const u8 vrrp_prefix[] = { 0x00, 0x00, 0x5E, 0x00, 0x01 };
68 unformat_ethernet_arp_opcode_host_byte_order (unformat_input_t * input,
71 int *result = va_arg (*args, int *);
72 ethernet_arp_main_t *am = ðernet_arp_main;
76 if (unformat (input, "0x%x", &x) || unformat (input, "%d", &x))
85 if (unformat_user (input, unformat_vlib_number_by_name,
86 am->opcode_by_name, &i))
96 unformat_ethernet_arp_opcode_net_byte_order (unformat_input_t * input,
99 int *result = va_arg (*args, int *);
101 (input, unformat_ethernet_arp_opcode_host_byte_order, result))
104 *result = clib_host_to_net_u16 ((u16) * result);
111 } ethernet_arp_input_trace_t;
114 format_ethernet_arp_input_trace (u8 * s, va_list * va)
116 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
117 CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
118 ethernet_arp_input_trace_t *t = va_arg (*va, ethernet_arp_input_trace_t *);
121 format_ethernet_arp_header,
122 t->packet_data, sizeof (t->packet_data));
128 arp_is_enabled (ethernet_arp_main_t * am, u32 sw_if_index)
130 if (vec_len (am->ethernet_arp_by_sw_if_index) <= sw_if_index)
133 return (am->ethernet_arp_by_sw_if_index[sw_if_index].enabled);
137 arp_enable (ethernet_arp_main_t * am, u32 sw_if_index)
139 if (arp_is_enabled (am, sw_if_index))
142 vec_validate (am->ethernet_arp_by_sw_if_index, sw_if_index);
144 am->ethernet_arp_by_sw_if_index[sw_if_index].enabled = 1;
146 vnet_feature_enable_disable ("arp", "arp-reply", sw_if_index, 1, NULL, 0);
147 vnet_feature_enable_disable ("arp", "arp-disabled", sw_if_index, 0, NULL,
152 arp_disable (ethernet_arp_main_t * am, u32 sw_if_index)
154 if (!arp_is_enabled (am, sw_if_index))
157 vnet_feature_enable_disable ("arp", "arp-disabled", sw_if_index, 1, NULL,
159 vnet_feature_enable_disable ("arp", "arp-reply", sw_if_index, 0, NULL, 0);
161 am->ethernet_arp_by_sw_if_index[sw_if_index].enabled = 0;
165 arp_unnumbered (vlib_buffer_t * p0,
166 u32 input_sw_if_index, u32 conn_sw_if_index)
168 vnet_main_t *vnm = vnet_get_main ();
169 vnet_interface_main_t *vim = &vnm->interface_main;
170 vnet_sw_interface_t *si;
172 /* verify that the input interface is unnumbered to the connected.
173 * the connected interface is the interface on which the subnet is
175 si = &vim->sw_interfaces[input_sw_if_index];
177 if (!(si->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED &&
178 (si->unnumbered_sw_if_index == conn_sw_if_index)))
180 /* the input interface is not unnumbered to the interface on which
181 * the sub-net is configured that covers the ARP request.
182 * So this is not the case for unnumbered.. */
190 arp_learn (u32 sw_if_index,
191 const ethernet_arp_ip4_over_ethernet_address_t * addr)
194 ip_neighbor_learn_t l = {
200 .sw_if_index = sw_if_index,
204 ip_neighbor_learn_dp (&l);
206 return (ETHERNET_ARP_ERROR_l3_src_address_learned);
209 typedef enum arp_input_next_t_
212 ARP_INPUT_NEXT_DISABLED,
217 arp_input (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
219 u32 n_left_from, next_index, *from, *to_next, n_left_to_next;
220 ethernet_arp_main_t *am = ðernet_arp_main;
222 from = vlib_frame_vector_args (frame);
223 n_left_from = frame->n_vectors;
224 next_index = node->cached_next_index;
226 if (node->flags & VLIB_NODE_FLAG_TRACE)
227 vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
229 sizeof (ethernet_arp_input_trace_t));
231 while (n_left_from > 0)
233 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
235 while (n_left_from > 0 && n_left_to_next > 0)
237 const ethernet_arp_header_t *arp0;
238 arp_input_next_t next0;
242 pi0 = to_next[0] = from[0];
248 p0 = vlib_get_buffer (vm, pi0);
249 arp0 = vlib_buffer_get_current (p0);
251 error0 = ETHERNET_ARP_ERROR_replies_sent;
252 next0 = ARP_INPUT_NEXT_DROP;
256 clib_net_to_host_u16 (ETHERNET_ARP_HARDWARE_TYPE_ethernet) ?
257 ETHERNET_ARP_ERROR_l2_type_not_ethernet : error0);
260 clib_net_to_host_u16 (ETHERNET_TYPE_IP4) ?
261 ETHERNET_ARP_ERROR_l3_type_not_ip4 : error0);
263 (0 == arp0->ip4_over_ethernet[0].ip4.as_u32 ?
264 ETHERNET_ARP_ERROR_l3_dst_address_unset : error0);
266 if (ETHERNET_ARP_ERROR_replies_sent == error0)
268 next0 = ARP_INPUT_NEXT_DISABLED;
269 vnet_feature_arc_start (am->feature_arc_index,
270 vnet_buffer (p0)->sw_if_index[VLIB_RX],
274 p0->error = node->errors[error0];
276 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
277 n_left_to_next, pi0, next0);
280 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
283 return frame->n_vectors;
286 typedef enum arp_disabled_next_t_
288 ARP_DISABLED_NEXT_DROP,
290 } arp_disabled_next_t;
292 #define foreach_arp_disabled_error \
293 _ (DISABLED, "ARP Disabled on this interface") \
297 #define _(sym,string) ARP_DISABLED_ERROR_##sym,
298 foreach_arp_disabled_error
300 ARP_DISABLED_N_ERROR,
301 } arp_disabled_error_t;
303 static char *arp_disabled_error_strings[] = {
304 #define _(sym,string) string,
305 foreach_arp_disabled_error
310 arp_disabled (vlib_main_t * vm,
311 vlib_node_runtime_t * node, vlib_frame_t * frame)
313 u32 n_left_from, next_index, *from, *to_next, n_left_to_next;
315 from = vlib_frame_vector_args (frame);
316 n_left_from = frame->n_vectors;
317 next_index = node->cached_next_index;
319 if (node->flags & VLIB_NODE_FLAG_TRACE)
320 vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
322 sizeof (ethernet_arp_input_trace_t));
324 while (n_left_from > 0)
326 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
328 while (n_left_from > 0 && n_left_to_next > 0)
330 arp_disabled_next_t next0 = ARP_DISABLED_NEXT_DROP;
334 next0 = ARP_DISABLED_NEXT_DROP;
335 error0 = ARP_DISABLED_ERROR_DISABLED;
337 pi0 = to_next[0] = from[0];
343 p0 = vlib_get_buffer (vm, pi0);
344 p0->error = node->errors[error0];
346 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
347 n_left_to_next, pi0, next0);
350 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
353 return frame->n_vectors;
356 enum arp_dst_fib_type
364 * we're looking for FIB sources that indicate the destination
365 * is attached. There may be interposed DPO prior to the one
368 static enum arp_dst_fib_type
369 arp_dst_fib_check (const fib_node_index_t fei, fib_entry_flag_t * flags)
371 const fib_entry_t *entry = fib_entry_get (fei);
372 const fib_entry_src_t *entry_src;
375 FOR_EACH_SRC_ADDED(entry, entry_src, src,
377 *flags = fib_entry_get_flags_for_source (fei, src);
378 if (fib_entry_is_sourced (fei, FIB_SOURCE_ADJ))
379 return ARP_DST_FIB_ADJ;
380 else if (FIB_ENTRY_FLAG_CONNECTED & *flags)
381 return ARP_DST_FIB_CONN;
385 return ARP_DST_FIB_NONE;
389 arp_reply (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
391 vnet_main_t *vnm = vnet_get_main ();
392 u32 n_left_from, next_index, *from, *to_next;
393 u32 n_replies_sent = 0;
395 from = vlib_frame_vector_args (frame);
396 n_left_from = frame->n_vectors;
397 next_index = node->cached_next_index;
399 if (node->flags & VLIB_NODE_FLAG_TRACE)
400 vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
402 sizeof (ethernet_arp_input_trace_t));
404 while (n_left_from > 0)
408 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
410 while (n_left_from > 0 && n_left_to_next > 0)
413 ethernet_arp_header_t *arp0;
414 ethernet_header_t *eth_rx;
415 const ip4_address_t *if_addr0;
416 u32 pi0, error0, next0, sw_if_index0, conn_sw_if_index0, fib_index0;
417 u8 dst_is_local0, is_vrrp_reply0;
418 fib_node_index_t dst_fei, src_fei;
419 const fib_prefix_t *pfx0;
420 fib_entry_flag_t src_flags, dst_flags;
429 p0 = vlib_get_buffer (vm, pi0);
430 arp0 = vlib_buffer_get_current (p0);
431 /* Fill in ethernet header. */
432 eth_rx = ethernet_buffer_get_header (p0);
434 next0 = ARP_REPLY_NEXT_DROP;
435 error0 = ETHERNET_ARP_ERROR_replies_sent;
436 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
438 /* Check that IP address is local and matches incoming interface. */
439 fib_index0 = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);
440 if (~0 == fib_index0)
442 error0 = ETHERNET_ARP_ERROR_interface_no_table;
449 * we're looking for FIB entries that indicate the source
450 * is attached. There may be more specific non-attached
451 * routes that match the source, but these do not influence
452 * whether we respond to an ARP request, i.e. they do not
453 * influence whether we are the correct way for the sender
454 * to reach us, they only affect how we reach the sender.
456 fib_entry_t *src_fib_entry;
457 const fib_prefix_t *pfx;
458 fib_entry_src_t *src;
468 src_fei = ip4_fib_table_lookup (ip4_fib_get (fib_index0),
470 ip4_over_ethernet[0].ip4,
472 src_fib_entry = fib_entry_get (src_fei);
475 * It's possible that the source that provides the
476 * flags we need, or the flags we must not have,
477 * is not the best source, so check then all.
480 FOR_EACH_SRC_ADDED(src_fib_entry, src, source,
482 src_flags = fib_entry_get_flags_for_source (src_fei, source);
484 /* Reject requests/replies with our local interface
486 if (FIB_ENTRY_FLAG_LOCAL & src_flags)
488 error0 = ETHERNET_ARP_ERROR_l3_src_address_is_local;
490 * When VPP has an interface whose address is also
491 * applied to a TAP interface on the host, then VPP's
492 * TAP interface will be unnumbered to the 'real'
493 * interface and do proxy ARP from the host.
494 * The curious aspect of this setup is that ARP requests
495 * from the host will come from the VPP's own address.
496 * So don't drop immediately here, instead go see if this
497 * is a proxy ARP case.
501 /* A Source must also be local to subnet of matching
502 * interface address. */
503 if ((FIB_ENTRY_FLAG_ATTACHED & src_flags) ||
504 (FIB_ENTRY_FLAG_CONNECTED & src_flags))
511 * The packet was sent from an address that is not
512 * connected nor attached i.e. it is not from an
513 * address that is covered by a link's sub-net,
514 * nor is it a already learned host resp.
520 * shorter mask lookup for the next iteration.
522 pfx = fib_entry_get_prefix (src_fei);
523 mask = pfx->fp_len - 1;
526 * continue until we hit the default route or we find
527 * the attached we are looking for. The most likely
528 * outcome is we find the attached with the first source
529 * on the first lookup.
533 !fib_entry_is_sourced (src_fei, FIB_SOURCE_DEFAULT_ROUTE));
538 * the matching route is a not attached, i.e. it was
539 * added as a result of routing, rather than interface/ARP
540 * configuration. If the matching route is not a host route
543 error0 = ETHERNET_ARP_ERROR_l3_src_address_not_local;
548 dst_fei = ip4_fib_table_lookup (ip4_fib_get (fib_index0),
549 &arp0->ip4_over_ethernet[1].ip4,
551 conn_sw_if_index0 = fib_entry_get_any_resolving_interface (dst_fei);
553 switch (arp_dst_fib_check (dst_fei, &dst_flags))
555 case ARP_DST_FIB_ADJ:
557 * We matched an adj-fib on ths source subnet (a /32 previously
558 * added as a result of ARP). If this request is a gratuitous
559 * ARP, then learn from it.
560 * The check for matching an adj-fib, is to prevent hosts
561 * from spamming us with gratuitous ARPS that might otherwise
564 if (conn_sw_if_index0 != sw_if_index0)
565 error0 = ETHERNET_ARP_ERROR_l3_dst_address_not_local;
566 else if (arp0->ip4_over_ethernet[0].ip4.as_u32 ==
567 arp0->ip4_over_ethernet[1].ip4.as_u32)
568 error0 = arp_learn (sw_if_index0,
569 &arp0->ip4_over_ethernet[0]);
571 case ARP_DST_FIB_CONN:
572 /* destination is connected, continue to process */
574 case ARP_DST_FIB_NONE:
575 /* destination is not connected, stop here */
576 error0 = ETHERNET_ARP_ERROR_l3_dst_address_not_local;
580 dst_is_local0 = (FIB_ENTRY_FLAG_LOCAL & dst_flags);
581 pfx0 = fib_entry_get_prefix (dst_fei);
582 if_addr0 = &pfx0->fp_addr.ip4;
586 clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply))
589 (arp0->ip4_over_ethernet[0].mac.bytes, vrrp_prefix,
590 sizeof (vrrp_prefix))));
592 /* Trash ARP packets whose ARP-level source addresses do not
593 match their L2-frame-level source addresses, unless it's
594 a reply from a VRRP virtual router */
595 if (!ethernet_mac_address_equal
596 (eth_rx->src_address,
597 arp0->ip4_over_ethernet[0].mac.bytes) && !is_vrrp_reply0)
599 error0 = ETHERNET_ARP_ERROR_l2_address_mismatch;
603 /* Learn or update sender's mapping only for replies to addresses
604 * that are local to the subnet */
606 clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply))
610 arp_learn (sw_if_index0, &arp0->ip4_over_ethernet[0]);
612 /* a reply for a non-local destination could be a GARP.
613 * GARPs for hosts we know were handled above, so this one
615 error0 = ETHERNET_ARP_ERROR_l3_dst_address_not_local;
619 else if (arp0->opcode ==
620 clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_request) &&
621 (dst_is_local0 == 0))
626 /* Honor unnumbered interface, if any */
627 if (sw_if_index0 != conn_sw_if_index0 ||
628 sw_if_index0 != fib_entry_get_resolving_interface (src_fei))
631 * The interface the ARP is sent to or was received on is not the
632 * interface on which the covering prefix is configured.
633 * Maybe this is a case for unnumbered.
635 if (!arp_unnumbered (p0, sw_if_index0, conn_sw_if_index0))
637 error0 = ETHERNET_ARP_ERROR_unnumbered_mismatch;
641 if (arp0->ip4_over_ethernet[0].ip4.as_u32 ==
642 arp0->ip4_over_ethernet[1].ip4.as_u32)
644 error0 = ETHERNET_ARP_ERROR_gratuitous_arp;
648 next0 = arp_mk_reply (vnm, p0, sw_if_index0,
649 if_addr0, arp0, eth_rx);
651 /* We are going to reply to this request, so, in the absence of
652 errors, learn the sender */
654 error0 = arp_learn (sw_if_index0, &arp0->ip4_over_ethernet[1]);
660 vnet_feature_next (&next0, p0);
664 p0->error = node->errors[error0];
667 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
668 n_left_to_next, pi0, next0);
671 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
674 vlib_error_count (vm, node->node_index,
675 ETHERNET_ARP_ERROR_replies_sent, n_replies_sent);
677 return frame->n_vectors;
681 static char *ethernet_arp_error_strings[] = {
682 #define _(sym,string) string,
683 foreach_ethernet_arp_error
689 VLIB_REGISTER_NODE (arp_input_node, static) =
691 .function = arp_input,
693 .vector_size = sizeof (u32),
694 .n_errors = ETHERNET_ARP_N_ERROR,
695 .error_strings = ethernet_arp_error_strings,
696 .n_next_nodes = ARP_INPUT_N_NEXT,
698 [ARP_INPUT_NEXT_DROP] = "error-drop",
699 [ARP_INPUT_NEXT_DISABLED] = "arp-disabled",
701 .format_buffer = format_ethernet_arp_header,
702 .format_trace = format_ethernet_arp_input_trace,
705 VLIB_REGISTER_NODE (arp_disabled_node, static) =
707 .function = arp_disabled,
708 .name = "arp-disabled",
709 .vector_size = sizeof (u32),
710 .n_errors = ARP_DISABLED_N_ERROR,
711 .error_strings = arp_disabled_error_strings,
712 .n_next_nodes = ARP_DISABLED_N_NEXT,
714 [ARP_INPUT_NEXT_DROP] = "error-drop",
716 .format_buffer = format_ethernet_arp_header,
717 .format_trace = format_ethernet_arp_input_trace,
720 VLIB_REGISTER_NODE (arp_reply_node, static) =
722 .function = arp_reply,
724 .vector_size = sizeof (u32),
725 .n_errors = ETHERNET_ARP_N_ERROR,
726 .error_strings = ethernet_arp_error_strings,
727 .n_next_nodes = ARP_REPLY_N_NEXT,
729 [ARP_REPLY_NEXT_DROP] = "error-drop",
730 [ARP_REPLY_NEXT_REPLY_TX] = "interface-output",
732 .format_buffer = format_ethernet_arp_header,
733 .format_trace = format_ethernet_arp_input_trace,
736 /* Built-in ARP rx feature path definition */
737 VNET_FEATURE_ARC_INIT (arp_feat, static) =
740 .start_nodes = VNET_FEATURES ("arp-input"),
741 .last_in_arc = "error-drop",
742 .arc_index_ptr = ðernet_arp_main.feature_arc_index,
745 VNET_FEATURE_INIT (arp_reply_feat_node, static) =
748 .node_name = "arp-reply",
749 .runs_before = VNET_FEATURES ("arp-disabled"),
752 VNET_FEATURE_INIT (arp_proxy_feat_node, static) =
755 .node_name = "arp-proxy",
756 .runs_after = VNET_FEATURES ("arp-reply"),
757 .runs_before = VNET_FEATURES ("arp-disabled"),
760 VNET_FEATURE_INIT (arp_disabled_feat_node, static) =
763 .node_name = "arp-disabled",
764 .runs_before = VNET_FEATURES ("error-drop"),
767 VNET_FEATURE_INIT (arp_drop_feat_node, static) =
770 .node_name = "error-drop",
771 .runs_before = 0, /* last feature */
778 pg_edit_t l2_type, l3_type;
779 pg_edit_t n_l2_address_bytes, n_l3_address_bytes;
785 } ip4_over_ethernet[2];
786 } pg_ethernet_arp_header_t;
789 pg_ethernet_arp_header_init (pg_ethernet_arp_header_t * p)
791 /* Initialize fields that are not bit fields in the IP header. */
792 #define _(f) pg_edit_init (&p->f, ethernet_arp_header_t, f);
795 _(n_l2_address_bytes);
796 _(n_l3_address_bytes);
798 _(ip4_over_ethernet[0].mac);
799 _(ip4_over_ethernet[0].ip4);
800 _(ip4_over_ethernet[1].mac);
801 _(ip4_over_ethernet[1].ip4);
806 unformat_pg_arp_header (unformat_input_t * input, va_list * args)
808 pg_stream_t *s = va_arg (*args, pg_stream_t *);
809 pg_ethernet_arp_header_t *p;
812 p = pg_create_edit_group (s, sizeof (p[0]), sizeof (ethernet_arp_header_t),
814 pg_ethernet_arp_header_init (p);
817 pg_edit_set_fixed (&p->l2_type, ETHERNET_ARP_HARDWARE_TYPE_ethernet);
818 pg_edit_set_fixed (&p->l3_type, ETHERNET_TYPE_IP4);
819 pg_edit_set_fixed (&p->n_l2_address_bytes, 6);
820 pg_edit_set_fixed (&p->n_l3_address_bytes, 4);
822 if (!unformat (input, "%U: %U/%U -> %U/%U",
824 unformat_ethernet_arp_opcode_net_byte_order, &p->opcode,
826 unformat_mac_address_t, &p->ip4_over_ethernet[0].mac,
828 unformat_ip4_address, &p->ip4_over_ethernet[0].ip4,
830 unformat_mac_address_t, &p->ip4_over_ethernet[1].mac,
832 unformat_ip4_address, &p->ip4_over_ethernet[1].ip4))
834 /* Free up any edits we may have added. */
835 pg_free_edit_group (s);
842 * callback when an interface address is added or deleted
845 arp_enable_disable_interface (ip4_main_t * im,
846 uword opaque, u32 sw_if_index, u32 is_enable)
848 ethernet_arp_main_t *am = ðernet_arp_main;
851 arp_enable (am, sw_if_index);
853 arp_disable (am, sw_if_index);
857 * Remove any arp entries associated with the specified interface
859 static clib_error_t *
860 vnet_arp_add_del_sw_interface (vnet_main_t * vnm, u32 sw_if_index, u32 is_add)
862 ethernet_arp_main_t *am = ðernet_arp_main;
864 arp_disable (am, sw_if_index);
868 VNET_SW_INTERFACE_ADD_DEL_FUNCTION (vnet_arp_add_del_sw_interface);
870 const static ip_neighbor_vft_t arp_vft = {
871 .inv_proxy4_add = arp_proxy_add,
872 .inv_proxy4_del = arp_proxy_del,
873 .inv_proxy4_enable = arp_proxy_disable,
874 .inv_proxy4_disable = arp_proxy_disable,
877 static clib_error_t *
878 ethernet_arp_init (vlib_main_t * vm)
880 ethernet_arp_main_t *am = ðernet_arp_main;
881 ip4_main_t *im = &ip4_main;
884 ethernet_register_input_type (vm, ETHERNET_TYPE_ARP, arp_input_node.index);
886 pn = pg_get_node (arp_input_node.index);
887 pn->unformat_edit = unformat_pg_arp_header;
889 am->opcode_by_name = hash_create_string (0, sizeof (uword));
890 #define _(o) hash_set_mem (am->opcode_by_name, #o, ETHERNET_ARP_OPCODE_##o);
891 foreach_ethernet_arp_opcode;
894 /* don't trace ARP error packets */
896 vlib_node_runtime_t *rt =
897 vlib_node_get_runtime (vm, arp_input_node.index);
900 vnet_pcap_drop_trace_filter_add_del \
901 (rt->errors[ETHERNET_ARP_ERROR_##a], \
903 foreach_ethernet_arp_error
908 ip4_enable_disable_interface_callback_t cb = {
909 .function = arp_enable_disable_interface,
911 vec_add1 (im->enable_disable_interface_callbacks, cb);
914 ip_neighbor_register (AF_IP4, &arp_vft);
920 VLIB_INIT_FUNCTION (ethernet_arp_init) =
922 .runs_after = VLIB_INITS("ethernet_init",
928 * fd.io coding-style-patch-verification: ON
931 * eval: (c-set-style "gnu")