Line data    Source code

       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             : #include <vnet/ip6-nd/ip6_ra.h>
      27             : 
      28             : typedef enum
      29             : {
      30             :   ICMP6_NEIGHBOR_SOLICITATION_NEXT_DROP,
      31             :   ICMP6_NEIGHBOR_SOLICITATION_NEXT_REPLY,
      32             :   ICMP6_NEIGHBOR_SOLICITATION_N_NEXT,
      33             : } icmp6_neighbor_solicitation_or_advertisement_next_t;
      34             : 
      35             : static_always_inline void
      36        1638 : icmp6_send_neighbor_advertisement (
      37             :   vlib_main_t *vm, vlib_buffer_t *b, ip6_header_t *ip6_h,
      38             :   icmp6_neighbor_solicitation_or_advertisement_header_t *icmp6_nsa,
      39             :   icmp6_neighbor_discovery_ethernet_link_layer_address_option_t
      40             :     *icmp6_nd_ell_addr,
      41             :   u32 sw_if_index0)
      42             : {
      43        1638 :   vnet_main_t *vnm = vnet_get_main ();
      44             :   vnet_sw_interface_t *sw_if;
      45             :   ethernet_interface_t *eth_if;
      46             :   ethernet_header_t *eth;
      47             :   int bogus_length;
      48             : 
      49             :   /* dst address is either source address or the all-nodes mcast addr */
      50        1638 :   if (!ip6_address_is_unspecified (&ip6_h->src_address))
      51        1638 :     ip6_h->dst_address = ip6_h->src_address;
      52             :   else
      53           0 :     ip6_set_reserved_multicast_address (&ip6_h->dst_address,
      54             :                                         IP6_MULTICAST_SCOPE_link_local,
      55             :                                         IP6_MULTICAST_GROUP_ID_all_hosts);
      56             : 
      57        1638 :   ip6_h->src_address = icmp6_nsa->target_address;
      58        1638 :   ip6_h->hop_limit = 255;
      59        1638 :   icmp6_nsa->icmp.type = ICMP6_neighbor_advertisement;
      60             : 
      61        1638 :   sw_if = vnet_get_sup_sw_interface (vnm, sw_if_index0);
      62        1638 :   ASSERT (sw_if->type == VNET_SW_INTERFACE_TYPE_HARDWARE);
      63        1638 :   eth_if = ethernet_get_interface (&ethernet_main, sw_if->hw_if_index);
      64        1638 :   if (eth_if && icmp6_nd_ell_addr)
      65             :     {
      66        1638 :       clib_memcpy (icmp6_nd_ell_addr->ethernet_address, &eth_if->address, 6);
      67        1638 :       icmp6_nd_ell_addr->header.type =
      68             :         ICMP6_NEIGHBOR_DISCOVERY_OPTION_target_link_layer_address;
      69             :     }
      70             : 
      71        1638 :   icmp6_nsa->advertisement_flags =
      72        1638 :     clib_host_to_net_u32 (ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_SOLICITED |
      73             :                           ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_OVERRIDE);
      74             : 
      75             :   /* if sending RAs is enabled, the "router" flag should be set,
      76             :    * otherwise, neighbors may believe we have changed from a router
      77             :    * to a host - RFC 4861 section 4.4 */
      78        1638 :   if (ip6_ra_adv_enabled (sw_if_index0))
      79           0 :     icmp6_nsa->advertisement_flags |=
      80           0 :       clib_host_to_net_u32 (ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_ROUTER);
      81             : 
      82        1638 :   icmp6_nsa->icmp.checksum = 0;
      83        1638 :   icmp6_nsa->icmp.checksum =
      84        1638 :     ip6_tcp_udp_icmp_compute_checksum (vm, b, ip6_h, &bogus_length);
      85        1638 :   ASSERT (bogus_length == 0);
      86             : 
      87             :   /* Reuse current MAC header, copy SMAC to DMAC and
      88             :    * interface MAC to SMAC */
      89        1638 :   vlib_buffer_advance (b, -ethernet_buffer_header_size (b));
      90        1638 :   eth = vlib_buffer_get_current (b);
      91        1638 :   clib_memcpy (eth->dst_address, eth->src_address, 6);
      92        1638 :   if (eth_if)
      93        1638 :     clib_memcpy (eth->src_address, &eth_if->address, 6);
      94             : 
      95             :   /* Setup input and output sw_if_index for packet */
      96        1638 :   ASSERT (vnet_buffer (b)->sw_if_index[VLIB_RX] == sw_if_index0);
      97        1638 :   vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index0;
      98        1638 :   vnet_buffer (b)->sw_if_index[VLIB_RX] =
      99        1638 :     vnet_main.local_interface_sw_if_index;
     100             : 
     101        1638 :   vlib_increment_simple_counter (
     102             :     &ip_neighbor_counters[AF_IP6].ipnc[VLIB_TX][IP_NEIGHBOR_CTR_REPLY],
     103             :     vm->thread_index, sw_if_index0, 1);
     104        1638 : }
     105             : 
     106             : #endif /* included_ip6_nd_inline_h */
     107             : 
     108             : /*
     109             :  * fd.io coding-style-patch-verification: ON
     110             :  *
     111             :  * Local Variables:
     112             :  * eval: (c-set-style "gnu")
     113             :  * End:
     114             :  */