Line data    Source code

       1             : /*
       2             :  * Copyright (c) 2019 Cisco and/or its affiliates.
       3             :  * Licensed under the Apache License, Version 2.0 (the "License");
       4             :  * you may not use this file except in compliance with the License.
       5             :  * You may obtain a copy of the License at:
       6             :  *
       7             :  *     http://www.apache.org/licenses/LICENSE-2.0
       8             :  *
       9             :  * Unless required by applicable law or agreed to in writing, software
      10             :  * distributed under the License is distributed on an "AS IS" BASIS,
      11             :  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
      12             :  * See the License for the specific language governing permissions and
      13             :  * limitations under the License.
      14             :  */
      15             : 
      16             : #ifndef __IP4_NEIGHBOR_H__
      17             : #define __IP4_NEIGHBOR_H__
      18             : 
      19             : #include <vnet/ip/ip.h>
      20             : #include <vnet/ethernet/arp_packet.h>
      21             : #include <vnet/ip-neighbor/ip_neighbor_types.h>
      22             : 
      23             : extern void ip4_neighbor_probe_dst (u32 sw_if_index, u32 thread_index,
      24             :                                     const ip4_address_t *dst);
      25             : extern void ip4_neighbor_advertise (vlib_main_t *vm, vnet_main_t *vnm,
      26             :                                     u32 sw_if_index, u32 thread_index,
      27             :                                     const ip4_address_t *addr);
      28             : 
      29             : always_inline vlib_buffer_t *
      30         842 : ip4_neighbor_probe (vlib_main_t *vm, vnet_main_t *vnm,
      31             :                     const ip_adjacency_t *adj0, const ip4_address_t *src,
      32             :                     const ip4_address_t *dst)
      33             : {
      34             :   vnet_hw_interface_t *hw_if0;
      35             :   ethernet_arp_header_t *h0;
      36             :   vlib_buffer_t *b0;
      37             :   u32 bi0;
      38             : 
      39         842 :   hw_if0 = vnet_get_sup_hw_interface (vnm, adj0->rewrite_header.sw_if_index);
      40             : 
      41             :   /* if (NULL == hw_if0->hw_address) */
      42             :   /*   return (NULL); */
      43             : 
      44             :   /* Send ARP request. */
      45         842 :   h0 = vlib_packet_template_get_packet (vm,
      46             :                                         &ip4_main.ip4_arp_request_packet_template,
      47             :                                         &bi0);
      48             :   /* Seems we're out of buffers */
      49         842 :   if (PREDICT_FALSE (!h0))
      50           0 :     return (NULL);
      51             : 
      52         842 :   b0 = vlib_get_buffer (vm, bi0);
      53             : 
      54             :   /* Add rewrite/encap string for ARP packet. */
      55         842 :   vnet_rewrite_one_header (adj0[0], h0, sizeof (ethernet_header_t));
      56             : 
      57             :   /* Src ethernet address in ARP header. */
      58         842 :   mac_address_from_bytes (&h0->ip4_over_ethernet[0].mac, hw_if0->hw_address);
      59             : 
      60         842 :   h0->ip4_over_ethernet[0].ip4 = *src;
      61         842 :   h0->ip4_over_ethernet[1].ip4 = *dst;
      62             : 
      63         842 :   vnet_buffer (b0)->sw_if_index[VLIB_TX] = adj0->rewrite_header.sw_if_index;
      64         842 :   b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
      65             : 
      66         842 :   vlib_buffer_advance (b0, -adj0->rewrite_header.data_bytes);
      67             : 
      68             :   {
      69         842 :     vlib_frame_t *f = vlib_get_frame_to_node (vm, hw_if0->output_node_index);
      70         842 :     u32 *to_next = vlib_frame_vector_args (f);
      71         842 :     to_next[0] = bi0;
      72         842 :     f->n_vectors = 1;
      73         842 :     vlib_put_frame_to_node (vm, hw_if0->output_node_index, f);
      74             :   }
      75             : 
      76         842 :   vlib_increment_simple_counter (
      77             :     &ip_neighbor_counters[AF_IP4].ipnc[VLIB_TX][IP_NEIGHBOR_CTR_REQUEST],
      78             :     vm->thread_index, adj0->rewrite_header.sw_if_index, 1);
      79             : 
      80         842 :   return b0;
      81             : }
      82             : 
      83             : #endif
      84             : 
      85             : /*
      86             :  * fd.io coding-style-patch-verification: ON
      87             :  *
      88             :  * Local Variables:
      89             :  * eval: (c-set-style "gnu")
      90             :  * End:
      91             :  */