src/vnet/ip6-nd/ip6_nd_inline.h

   1 /*
   2  *
   3  * ip6_nd_inline.h: ip6 neighbor discovery inline
   4  *
   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:
   9  *
  10  *     http://www.apache.org/licenses/LICENSE-2.0
  11  *
  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.
  17  */
  18
  19 #ifndef __IP6_ND_INLINE_H__
  20 #define __IP6_ND_INLINE_H__
  21
  22 #include <vnet/ethernet/ethernet.h>
  23 #include <vnet/ip/icmp46_packet.h>
  24 #include <vnet/ip/ip6.h>
  25
  26 typedef enum
  27 {
  28   ICMP6_NEIGHBOR_SOLICITATION_NEXT_DROP,
  29   ICMP6_NEIGHBOR_SOLICITATION_NEXT_REPLY,
  30   ICMP6_NEIGHBOR_SOLICITATION_N_NEXT,
  31 } icmp6_neighbor_solicitation_or_advertisement_next_t;
  32
  33 static_always_inline void
  34 icmp6_send_neighbor_advertisement (
  35   vlib_main_t *vm, vlib_buffer_t *b, ip6_header_t *ip6_h,
  36   icmp6_neighbor_solicitation_or_advertisement_header_t *icmp6_nsa,
  37   icmp6_neighbor_discovery_ethernet_link_layer_address_option_t
  38     *icmp6_nd_ell_addr,
  39   u32 sw_if_index0)
  40 {
  41   vnet_main_t *vnm = vnet_get_main ();
  42   vnet_sw_interface_t *sw_if;
  43   ethernet_interface_t *eth_if;
  44   ethernet_header_t *eth;
  45   int bogus_length;
  46
  47   /* dst address is either source address or the all-nodes mcast addr */
  48   if (!ip6_address_is_unspecified (&ip6_h->src_address))
  49     ip6_h->dst_address = ip6_h->src_address;
  50   else
  51     ip6_set_reserved_multicast_address (&ip6_h->dst_address,
  52                                         IP6_MULTICAST_SCOPE_link_local,
  53                                         IP6_MULTICAST_GROUP_ID_all_hosts);
  54
  55   ip6_h->src_address = icmp6_nsa->target_address;
  56   ip6_h->hop_limit = 255;
  57   icmp6_nsa->icmp.type = ICMP6_neighbor_advertisement;
  58
  59   sw_if = vnet_get_sup_sw_interface (vnm, sw_if_index0);
  60   ASSERT (sw_if->type == VNET_SW_INTERFACE_TYPE_HARDWARE);
  61   eth_if = ethernet_get_interface (&ethernet_main, sw_if->hw_if_index);
  62   if (eth_if && icmp6_nd_ell_addr)
  63     {
  64       clib_memcpy (icmp6_nd_ell_addr->ethernet_address, &eth_if->address, 6);
  65       icmp6_nd_ell_addr->header.type =
  66         ICMP6_NEIGHBOR_DISCOVERY_OPTION_target_link_layer_address;
  67     }
  68
  69   icmp6_nsa->advertisement_flags =
  70     clib_host_to_net_u32 (ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_SOLICITED |
  71                           ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_OVERRIDE);
  72
  73   icmp6_nsa->icmp.checksum = 0;
  74   icmp6_nsa->icmp.checksum =
  75     ip6_tcp_udp_icmp_compute_checksum (vm, b, ip6_h, &bogus_length);
  76   ASSERT (bogus_length == 0);
  77
  78   /* Reuse current MAC header, copy SMAC to DMAC and
  79    * interface MAC to SMAC */
  80   vlib_buffer_advance (b, -ethernet_buffer_header_size (b));
  81   eth = vlib_buffer_get_current (b);
  82   clib_memcpy (eth->dst_address, eth->src_address, 6);
  83   if (eth_if)
  84     clib_memcpy (eth->src_address, &eth_if->address, 6);
  85
  86   /* Setup input and output sw_if_index for packet */
  87   ASSERT (vnet_buffer (b)->sw_if_index[VLIB_RX] == sw_if_index0);
  88   vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index0;
  89   vnet_buffer (b)->sw_if_index[VLIB_RX] =
  90     vnet_main.local_interface_sw_if_index;
  91 }
  92
  93 #endif /* included_ip6_nd_inline_h */
  94
  95 /*
  96  * fd.io coding-style-patch-verification: ON
  97  *
  98  * Local Variables:
  99  * eval: (c-set-style "gnu")
 100  * End:
 101  */