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/*
* ip/ip6_neighbor.h: IP6 NS transmit
*
* 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 __IP6_NEIGHBOR_H__
#define __IP6_NEIGHBOR_H__
#include <vlib/vlib.h>
#include <vnet/ip/format.h>
#include <vnet/ip/ip6.h>
#include <vnet/ip/ip6_link.h>
#include <vnet/ip/icmp46_packet.h>
#include <vnet/ethernet/ethernet.h>
#include <vnet/adj/adj_internal.h>
/* Template used to generate IP6 neighbor solicitation packets. */
extern vlib_packet_template_t ip6_neighbor_packet_template;
extern void ip6_neighbor_advertise (vlib_main_t * vm,
vnet_main_t * vnm,
u32 sw_if_index,
const ip6_address_t * addr);
extern void ip6_neighbor_probe_dst (u32 sw_if_index,
const ip6_address_t * dst);
always_inline vlib_buffer_t *
ip6_neighbor_probe (vlib_main_t * vm,
vnet_main_t * vnm,
u32 sw_if_index,
const ip6_address_t * src, const ip6_address_t * dst)
{
icmp6_neighbor_solicitation_header_t *h0;
vnet_hw_interface_t *hw_if0;
const ip_adjacency_t *adj;
vlib_buffer_t *b0;
int bogus_length;
u32 bi0 = 0;
h0 = vlib_packet_template_get_packet
(vm, &ip6_neighbor_packet_template, &bi0);
if (!h0)
return NULL;
/* if the interface has been disabled for ip6, later steps to retrieve
* an adjacency will result in a segv.
*/
if (!ip6_link_is_enabled (sw_if_index))
return NULL;
b0 = vlib_get_buffer (vm, bi0);
hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index);
/*
* Destination address is a solicited node multicast address.
* We need to fill in
* the low 24 bits with low 24 bits of target's address.
*/
h0->ip.src_address = *src;
h0->ip.dst_address.as_u8[13] = dst->as_u8[13];
h0->ip.dst_address.as_u8[14] = dst->as_u8[14];
h0->ip.dst_address.as_u8[15] = dst->as_u8[15];
h0->neighbor.target_address = *dst;
clib_memcpy (h0->link_layer_option.ethernet_address,
hw_if0->hw_address, vec_len (hw_if0->hw_address));
/* $$$$ appears we need this; why is the checksum non-zero? */
h0->neighbor.icmp.checksum = 0;
h0->neighbor.icmp.checksum =
ip6_tcp_udp_icmp_compute_checksum (vm, 0, &h0->ip, &bogus_length);
ASSERT (bogus_length == 0);
vnet_buffer (b0)->sw_if_index[VLIB_TX] = sw_if_index;
/* Use the link's mcast adj to ship the packet */
vnet_buffer (b0)->ip.adj_index[VLIB_TX] =
ip6_link_get_mcast_adj (sw_if_index);
adj = adj_get (vnet_buffer (b0)->ip.adj_index[VLIB_TX]);
b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
{
vlib_frame_t *f = vlib_get_frame_to_node (vm, adj->ia_node_index);
u32 *to_next = vlib_frame_vector_args (f);
to_next[0] = bi0;
f->n_vectors = 1;
vlib_put_frame_to_node (vm, adj->ia_node_index, f);
}
return b0;
}
#endif
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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