1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
|
/*
*
* ip6_nd_inline.h: ip6 neighbor discovery inline
*
* Copyright (c) 2021 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_ND_INLINE_H__
#define __IP6_ND_INLINE_H__
#include <vnet/ethernet/ethernet.h>
#include <vnet/ip/icmp46_packet.h>
#include <vnet/ip/ip6.h>
#include <vnet/ip-neighbor/ip_neighbor_types.h>
#include <vnet/ip6-nd/ip6_ra.h>
typedef enum
{
ICMP6_NEIGHBOR_SOLICITATION_NEXT_DROP,
ICMP6_NEIGHBOR_SOLICITATION_NEXT_REPLY,
ICMP6_NEIGHBOR_SOLICITATION_N_NEXT,
} icmp6_neighbor_solicitation_or_advertisement_next_t;
static_always_inline void
icmp6_send_neighbor_advertisement (
vlib_main_t *vm, vlib_buffer_t *b, ip6_header_t *ip6_h,
icmp6_neighbor_solicitation_or_advertisement_header_t *icmp6_nsa,
icmp6_neighbor_discovery_ethernet_link_layer_address_option_t
*icmp6_nd_ell_addr,
u32 sw_if_index0)
{
vnet_main_t *vnm = vnet_get_main ();
vnet_sw_interface_t *sw_if;
ethernet_interface_t *eth_if;
ethernet_header_t *eth;
int bogus_length;
/* dst address is either source address or the all-nodes mcast addr */
if (!ip6_address_is_unspecified (&ip6_h->src_address))
ip6_h->dst_address = ip6_h->src_address;
else
ip6_set_reserved_multicast_address (&ip6_h->dst_address,
IP6_MULTICAST_SCOPE_link_local,
IP6_MULTICAST_GROUP_ID_all_hosts);
ip6_h->src_address = icmp6_nsa->target_address;
ip6_h->hop_limit = 255;
icmp6_nsa->icmp.type = ICMP6_neighbor_advertisement;
sw_if = vnet_get_sup_sw_interface (vnm, sw_if_index0);
ASSERT (sw_if->type == VNET_SW_INTERFACE_TYPE_HARDWARE);
eth_if = ethernet_get_interface (ðernet_main, sw_if->hw_if_index);
if (eth_if && icmp6_nd_ell_addr)
{
clib_memcpy (icmp6_nd_ell_addr->ethernet_address, ð_if->address, 6);
icmp6_nd_ell_addr->header.type =
ICMP6_NEIGHBOR_DISCOVERY_OPTION_target_link_layer_address;
}
icmp6_nsa->advertisement_flags =
clib_host_to_net_u32 (ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_SOLICITED |
ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_OVERRIDE);
/* if sending RAs is enabled, the "router" flag should be set,
* otherwise, neighbors may believe we have changed from a router
* to a host - RFC 4861 section 4.4 */
if (ip6_ra_adv_enabled (sw_if_index0))
icmp6_nsa->advertisement_flags |=
clib_host_to_net_u32 (ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_ROUTER);
icmp6_nsa->icmp.checksum = 0;
icmp6_nsa->icmp.checksum =
ip6_tcp_udp_icmp_compute_checksum (vm, b, ip6_h, &bogus_length);
ASSERT (bogus_length == 0);
/* Reuse current MAC header, copy SMAC to DMAC and
* interface MAC to SMAC */
vlib_buffer_advance (b, -ethernet_buffer_header_size (b));
eth = vlib_buffer_get_current (b);
clib_memcpy (eth->dst_address, eth->src_address, 6);
if (eth_if)
clib_memcpy (eth->src_address, ð_if->address, 6);
/* Setup input and output sw_if_index for packet */
ASSERT (vnet_buffer (b)->sw_if_index[VLIB_RX] == sw_if_index0);
vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index0;
vnet_buffer (b)->sw_if_index[VLIB_RX] =
vnet_main.local_interface_sw_if_index;
vlib_increment_simple_counter (
&ip_neighbor_counters[AF_IP6].ipnc[VLIB_TX][IP_NEIGHBOR_CTR_REPLY],
vm->thread_index, sw_if_index0, 1);
}
#endif /* included_ip6_nd_inline_h */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
|
