2 * Copyright (c) 2019 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
16 #ifndef __IP4_NEIGHBOR_H__
17 #define __IP4_NEIGHBOR_H__
19 #include <vnet/ip/ip.h>
20 #include <vnet/ethernet/arp_packet.h>
21 #include <vnet/ip-neighbor/ip_neighbor_types.h>
23 extern void ip4_neighbor_probe_dst (u32 sw_if_index, u32 thread_index,
24 const ip4_address_t *dst);
25 extern void ip4_neighbor_advertise (vlib_main_t *vm, vnet_main_t *vnm,
26 u32 sw_if_index, u32 thread_index,
27 const ip4_address_t *addr);
29 always_inline vlib_buffer_t *
30 ip4_neighbor_probe (vlib_main_t *vm, vnet_main_t *vnm,
31 const ip_adjacency_t *adj0, const ip4_address_t *src,
32 const ip4_address_t *dst)
34 vnet_hw_interface_t *hw_if0;
35 ethernet_arp_header_t *h0;
39 hw_if0 = vnet_get_sup_hw_interface (vnm, adj0->rewrite_header.sw_if_index);
41 /* if (NULL == hw_if0->hw_address) */
44 /* Send ARP request. */
45 h0 = vlib_packet_template_get_packet (vm,
46 &ip4_main.ip4_arp_request_packet_template,
48 /* Seems we're out of buffers */
49 if (PREDICT_FALSE (!h0))
52 b0 = vlib_get_buffer (vm, bi0);
54 /* Add rewrite/encap string for ARP packet. */
55 vnet_rewrite_one_header (adj0[0], h0, sizeof (ethernet_header_t));
57 /* Src ethernet address in ARP header. */
58 mac_address_from_bytes (&h0->ip4_over_ethernet[0].mac, hw_if0->hw_address);
60 h0->ip4_over_ethernet[0].ip4 = *src;
61 h0->ip4_over_ethernet[1].ip4 = *dst;
63 vnet_buffer (b0)->sw_if_index[VLIB_TX] = adj0->rewrite_header.sw_if_index;
64 b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
66 vlib_buffer_advance (b0, -adj0->rewrite_header.data_bytes);
69 vlib_frame_t *f = vlib_get_frame_to_node (vm, hw_if0->output_node_index);
70 u32 *to_next = vlib_frame_vector_args (f);
73 vlib_put_frame_to_node (vm, hw_if0->output_node_index, f);
76 vlib_increment_simple_counter (
77 &ip_neighbor_counters[AF_IP4].ipnc[VLIB_TX][IP_NEIGHBOR_CTR_REQUEST],
78 vm->thread_index, adj0->rewrite_header.sw_if_index, 1);
86 * fd.io coding-style-patch-verification: ON
89 * eval: (c-set-style "gnu")