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/*
* Copyright (c) 2019 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef __IP4_NEIGHBOR_H__
#define __IP4_NEIGHBOR_H__
#include <vnet/ip/ip.h>
#include <vnet/ethernet/arp_packet.h>
#include <vnet/ip-neighbor/ip_neighbor_types.h>
extern void ip4_neighbor_probe_dst (u32 sw_if_index, u32 thread_index,
const ip4_address_t *dst);
extern void ip4_neighbor_advertise (vlib_main_t *vm, vnet_main_t *vnm,
u32 sw_if_index, u32 thread_index,
const ip4_address_t *addr);
always_inline vlib_buffer_t *
ip4_neighbor_probe (vlib_main_t *vm, vnet_main_t *vnm,
const ip_adjacency_t *adj0, const ip4_address_t *src,
const ip4_address_t *dst)
{
vnet_hw_interface_t *hw_if0;
ethernet_arp_header_t *h0;
vlib_buffer_t *b0;
u32 bi0;
hw_if0 = vnet_get_sup_hw_interface (vnm, adj0->rewrite_header.sw_if_index);
/* if (NULL == hw_if0->hw_address) */
/* return (NULL); */
/* Send ARP request. */
h0 = vlib_packet_template_get_packet (vm,
&ip4_main.ip4_arp_request_packet_template,
&bi0);
/* Seems we're out of buffers */
if (PREDICT_FALSE (!h0))
return (NULL);
b0 = vlib_get_buffer (vm, bi0);
/* Add rewrite/encap string for ARP packet. */
vnet_rewrite_one_header (adj0[0], h0, sizeof (ethernet_header_t));
/* Src ethernet address in ARP header. */
mac_address_from_bytes (&h0->ip4_over_ethernet[0].mac, hw_if0->hw_address);
h0->ip4_over_ethernet[0].ip4 = *src;
h0->ip4_over_ethernet[1].ip4 = *dst;
vnet_buffer (b0)->sw_if_index[VLIB_TX] = adj0->rewrite_header.sw_if_index;
b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
vlib_buffer_advance (b0, -adj0->rewrite_header.data_bytes);
{
vlib_frame_t *f = vlib_get_frame_to_node (vm, hw_if0->output_node_index);
u32 *to_next = vlib_frame_vector_args (f);
to_next[0] = bi0;
f->n_vectors = 1;
vlib_put_frame_to_node (vm, hw_if0->output_node_index, f);
}
vlib_increment_simple_counter (
&ip_neighbor_counters[AF_IP4].ipnc[VLIB_TX][IP_NEIGHBOR_CTR_REQUEST],
vm->thread_index, adj0->rewrite_header.sw_if_index, 1);
return b0;
}
#endif
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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