3 * ip6_nd_inline.h: ip6 neighbor discovery inline
5 * Copyright (c) 2021 Cisco and/or its affiliates.
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at:
10 * http://www.apache.org/licenses/LICENSE-2.0
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
19 #ifndef __IP6_ND_INLINE_H__
20 #define __IP6_ND_INLINE_H__
22 #include <vnet/ethernet/ethernet.h>
23 #include <vnet/ip/icmp46_packet.h>
24 #include <vnet/ip/ip6.h>
25 #include <vnet/ip-neighbor/ip_neighbor_types.h>
29 ICMP6_NEIGHBOR_SOLICITATION_NEXT_DROP,
30 ICMP6_NEIGHBOR_SOLICITATION_NEXT_REPLY,
31 ICMP6_NEIGHBOR_SOLICITATION_N_NEXT,
32 } icmp6_neighbor_solicitation_or_advertisement_next_t;
34 static_always_inline void
35 icmp6_send_neighbor_advertisement (
36 vlib_main_t *vm, vlib_buffer_t *b, ip6_header_t *ip6_h,
37 icmp6_neighbor_solicitation_or_advertisement_header_t *icmp6_nsa,
38 icmp6_neighbor_discovery_ethernet_link_layer_address_option_t
42 vnet_main_t *vnm = vnet_get_main ();
43 vnet_sw_interface_t *sw_if;
44 ethernet_interface_t *eth_if;
45 ethernet_header_t *eth;
48 /* dst address is either source address or the all-nodes mcast addr */
49 if (!ip6_address_is_unspecified (&ip6_h->src_address))
50 ip6_h->dst_address = ip6_h->src_address;
52 ip6_set_reserved_multicast_address (&ip6_h->dst_address,
53 IP6_MULTICAST_SCOPE_link_local,
54 IP6_MULTICAST_GROUP_ID_all_hosts);
56 ip6_h->src_address = icmp6_nsa->target_address;
57 ip6_h->hop_limit = 255;
58 icmp6_nsa->icmp.type = ICMP6_neighbor_advertisement;
60 sw_if = vnet_get_sup_sw_interface (vnm, sw_if_index0);
61 ASSERT (sw_if->type == VNET_SW_INTERFACE_TYPE_HARDWARE);
62 eth_if = ethernet_get_interface (ðernet_main, sw_if->hw_if_index);
63 if (eth_if && icmp6_nd_ell_addr)
65 clib_memcpy (icmp6_nd_ell_addr->ethernet_address, ð_if->address, 6);
66 icmp6_nd_ell_addr->header.type =
67 ICMP6_NEIGHBOR_DISCOVERY_OPTION_target_link_layer_address;
70 icmp6_nsa->advertisement_flags =
71 clib_host_to_net_u32 (ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_SOLICITED |
72 ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_OVERRIDE);
74 icmp6_nsa->icmp.checksum = 0;
75 icmp6_nsa->icmp.checksum =
76 ip6_tcp_udp_icmp_compute_checksum (vm, b, ip6_h, &bogus_length);
77 ASSERT (bogus_length == 0);
79 /* Reuse current MAC header, copy SMAC to DMAC and
80 * interface MAC to SMAC */
81 vlib_buffer_advance (b, -ethernet_buffer_header_size (b));
82 eth = vlib_buffer_get_current (b);
83 clib_memcpy (eth->dst_address, eth->src_address, 6);
85 clib_memcpy (eth->src_address, ð_if->address, 6);
87 /* Setup input and output sw_if_index for packet */
88 ASSERT (vnet_buffer (b)->sw_if_index[VLIB_RX] == sw_if_index0);
89 vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index0;
90 vnet_buffer (b)->sw_if_index[VLIB_RX] =
91 vnet_main.local_interface_sw_if_index;
93 vlib_increment_simple_counter (
94 &ip_neighbor_counters[AF_IP6].ipnc[VLIB_TX][IP_NEIGHBOR_CTR_REPLY],
95 vm->thread_index, sw_if_index0, 1);
98 #endif /* included_ip6_nd_inline_h */
101 * fd.io coding-style-patch-verification: ON
104 * eval: (c-set-style "gnu")