Line data    Source code

       1             : /*
       2             :  * ip/ip6_neighbor.h: IP6 NS transmit
       3             :  *
       4             :  * Copyright (c) 2019 Cisco and/or its affiliates.
       5             :  * Licensed under the Apache License, Version 2.0 (the "License");
       6             :  * you may not use this file except in compliance with the License.
       7             :  * You may obtain a copy of the License at:
       8             :  *
       9             :  *     http://www.apache.org/licenses/LICENSE-2.0
      10             :  *
      11             :  * Unless required by applicable law or agreed to in writing, software
      12             :  * distributed under the License is distributed on an "AS IS" BASIS,
      13             :  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
      14             :  * See the License for the specific language governing permissions and
      15             :  * limitations under the License.
      16             :  */
      17             : 
      18             : #ifndef __IP6_NEIGHBOR_H__
      19             : #define __IP6_NEIGHBOR_H__
      20             : 
      21             : #include <vlib/vlib.h>
      22             : #include <vnet/ip/format.h>
      23             : #include <vnet/ip/ip6.h>
      24             : #include <vnet/ip/ip6_link.h>
      25             : #include <vnet/ip/icmp46_packet.h>
      26             : #include <vnet/ethernet/ethernet.h>
      27             : #include <vnet/adj/adj_internal.h>
      28             : #include <vnet/ip-neighbor/ip_neighbor_types.h>
      29             : 
      30             : /* Template used to generate IP6 neighbor solicitation packets. */
      31             : extern vlib_packet_template_t ip6_neighbor_packet_template;
      32             : 
      33             : extern void ip6_neighbor_advertise (vlib_main_t *vm, vnet_main_t *vnm,
      34             :                                     u32 sw_if_index, u32 thread_index,
      35             :                                     const ip6_address_t *addr);
      36             : 
      37             : extern void ip6_neighbor_probe_dst (u32 sw_if_index, u32 thread_index,
      38             :                                     const ip6_address_t *dst);
      39             : 
      40             : always_inline vlib_buffer_t *
      41          89 : ip6_neighbor_probe (vlib_main_t *vm, vnet_main_t *vnm, u32 sw_if_index,
      42             :                     u32 thread_index, const ip6_address_t *src,
      43             :                     const ip6_address_t *dst)
      44             : {
      45             :   icmp6_neighbor_solicitation_header_t *h0;
      46             :   vnet_hw_interface_t *hw_if0;
      47             :   const ip_adjacency_t *adj;
      48             :   vlib_buffer_t *b0;
      49             :   int bogus_length;
      50          89 :   u32 bi0 = 0;
      51             : 
      52          89 :   h0 = vlib_packet_template_get_packet
      53             :     (vm, &ip6_neighbor_packet_template, &bi0);
      54          89 :   if (!h0)
      55           0 :     return NULL;
      56             : 
      57             :   /* if the interface has been disabled for ip6, later steps to retrieve
      58             :    * an adjacency will result in a segv.
      59             :    */
      60          89 :   if (!ip6_link_is_enabled (sw_if_index))
      61           4 :     return NULL;
      62             : 
      63          85 :   b0 = vlib_get_buffer (vm, bi0);
      64             : 
      65          85 :   hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index);
      66             : 
      67             :   /*
      68             :    * Destination address is a solicited node multicast address.
      69             :    * We need to fill in
      70             :    * the low 24 bits with low 24 bits of target's address.
      71             :    */
      72          85 :   h0->ip.src_address = *src;
      73          85 :   h0->ip.dst_address.as_u8[13] = dst->as_u8[13];
      74          85 :   h0->ip.dst_address.as_u8[14] = dst->as_u8[14];
      75          85 :   h0->ip.dst_address.as_u8[15] = dst->as_u8[15];
      76             : 
      77          85 :   h0->neighbor.target_address = *dst;
      78             : 
      79          85 :   clib_memcpy (h0->link_layer_option.ethernet_address,
      80             :                hw_if0->hw_address, vec_len (hw_if0->hw_address));
      81             : 
      82             :   /* $$$$ appears we need this; why is the checksum non-zero? */
      83          85 :   h0->neighbor.icmp.checksum = 0;
      84          85 :   h0->neighbor.icmp.checksum =
      85          85 :     ip6_tcp_udp_icmp_compute_checksum (vm, 0, &h0->ip, &bogus_length);
      86             : 
      87          85 :   ASSERT (bogus_length == 0);
      88             : 
      89          85 :   vnet_buffer (b0)->sw_if_index[VLIB_TX] = sw_if_index;
      90             : 
      91             :   /* Use the link's mcast adj to ship the packet */
      92         170 :   vnet_buffer (b0)->ip.adj_index[VLIB_TX] =
      93          85 :     ip6_link_get_mcast_adj (sw_if_index);
      94          85 :   adj = adj_get (vnet_buffer (b0)->ip.adj_index[VLIB_TX]);
      95             : 
      96          85 :   b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
      97             : 
      98             :   {
      99          85 :     vlib_frame_t *f = vlib_get_frame_to_node (vm, adj->ia_node_index);
     100          85 :     u32 *to_next = vlib_frame_vector_args (f);
     101          85 :     to_next[0] = bi0;
     102          85 :     f->n_vectors = 1;
     103          85 :     vlib_put_frame_to_node (vm, adj->ia_node_index, f);
     104             :   }
     105             : 
     106          85 :   vlib_increment_simple_counter (
     107             :     &ip_neighbor_counters[AF_IP6].ipnc[VLIB_TX][IP_NEIGHBOR_CTR_REQUEST],
     108             :     thread_index, sw_if_index, 1);
     109             : 
     110          85 :   return b0;
     111             : }
     112             : 
     113             : #endif
     114             : 
     115             : /*
     116             :  * fd.io coding-style-patch-verification: ON
     117             :  *
     118             :  * Local Variables:
     119             :  * eval: (c-set-style "gnu")
     120             :  * End:
     121             :  */