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 #include <vnet/ip-neighbor/ip_neighbor_types.h>
  26
  27 typedef enum
  28 {
  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;
  33
  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
  39     *icmp6_nd_ell_addr,
  40   u32 sw_if_index0)
  41 {
  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;
  46   int bogus_length;
  47
  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;
  51   else
  52     ip6_set_reserved_multicast_address (&ip6_h->dst_address,
  53                                         IP6_MULTICAST_SCOPE_link_local,
  54                                         IP6_MULTICAST_GROUP_ID_all_hosts);
  55
  56   ip6_h->src_address = icmp6_nsa->target_address;
  57   ip6_h->hop_limit = 255;
  58   icmp6_nsa->icmp.type = ICMP6_neighbor_advertisement;
  59
  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 (&ethernet_main, sw_if->hw_if_index);
  63   if (eth_if && icmp6_nd_ell_addr)
  64     {
  65       clib_memcpy (icmp6_nd_ell_addr->ethernet_address, &eth_if->address, 6);
  66       icmp6_nd_ell_addr->header.type =
  67         ICMP6_NEIGHBOR_DISCOVERY_OPTION_target_link_layer_address;
  68     }
  69
  70   icmp6_nsa->advertisement_flags =
  71     clib_host_to_net_u32 (ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_SOLICITED |
  72                           ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_OVERRIDE);
  73
  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);
  78
  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);
  84   if (eth_if)
  85     clib_memcpy (eth->src_address, &eth_if->address, 6);
  86
  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;
  92
  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);
  96 }
  97
  98 #endif /* included_ip6_nd_inline_h */
  99
 100 /*
 101  * fd.io coding-style-patch-verification: ON
 102  *
 103  * Local Variables:
 104  * eval: (c-set-style "gnu")
 105  * End:
 106  */