src/vnet/adj/adj_dp.h

   1 /*
   2  * Copyright (c) 2016 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 __ADJ_DP_H__
  17 #define __ADJ_DP_H__
  18
  19 #include <vnet/adj/adj.h>
  20 #include <vnet/tunnel/tunnel_dp.h>
  21 #include <vnet/ip/ip4_inlines.h>
  22 #include <vnet/ip/ip6_inlines.h>
  23 #include <vnet/mpls/mpls_lookup.h>
  24
  25 static_always_inline void
  26 adj_midchain_ipip44_fixup (vlib_main_t * vm,
  27                            const ip_adjacency_t * adj,
  28                            vlib_buffer_t * b)
  29 {
  30   tunnel_encap_decap_flags_t flags;
  31   ip4_header_t *ip4;
  32
  33   flags = pointer_to_uword (adj->sub_type.midchain.fixup_data);
  34
  35   ip4 = vlib_buffer_get_current (b);
  36   ip4->length = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b));
  37
  38   if (PREDICT_TRUE(TUNNEL_ENCAP_DECAP_FLAG_NONE == flags))
  39   {
  40       ip_csum_t sum;
  41       u16 old,new;
  42
  43       old = 0;
  44       new = ip4->length;
  45
  46       sum = ip4->checksum;
  47       sum = ip_csum_update (sum, old, new, ip4_header_t, length);
  48       ip4->checksum = ip_csum_fold (sum);
  49   }
  50   else
  51   {
  52       tunnel_encap_fixup_4o4 (flags, ip4 + 1, ip4);
  53       ip4->checksum = ip4_header_checksum (ip4);
  54   }
  55 }
  56
  57 static_always_inline void
  58 adj_midchain_fixup (vlib_main_t *vm,
  59                     const ip_adjacency_t *adj,
  60                     vlib_buffer_t * b,
  61                     vnet_link_t lt)
  62 {
  63     if (PREDICT_TRUE(adj->rewrite_header.flags &
  64                      VNET_REWRITE_FIXUP_IP4_O_4))
  65         adj_midchain_ipip44_fixup (vm, adj, b);
  66     else if (adj->sub_type.midchain.fixup_func)
  67         adj->sub_type.midchain.fixup_func
  68             (vm, adj, b, adj->sub_type.midchain.fixup_data);
  69
  70     if (PREDICT_FALSE(adj->rewrite_header.flags &
  71                       VNET_REWRITE_FIXUP_FLOW_HASH))
  72     {
  73         if (VNET_LINK_IP4 == lt)
  74             vnet_buffer (b)->ip.flow_hash =
  75                 ip4_compute_flow_hash (vlib_buffer_get_current (b) + adj->rewrite_header.data_bytes,
  76                                        IP_FLOW_HASH_DEFAULT);
  77         else if (VNET_LINK_IP6 == lt)
  78             vnet_buffer (b)->ip.flow_hash =
  79                 ip6_compute_flow_hash (vlib_buffer_get_current (b) + adj->rewrite_header.data_bytes,
  80                                        IP_FLOW_HASH_DEFAULT);
  81         else if (VNET_LINK_MPLS == lt)
  82             vnet_buffer (b)->ip.flow_hash =
  83                 mpls_compute_flow_hash (vlib_buffer_get_current (b) + adj->rewrite_header.data_bytes,
  84                                        IP_FLOW_HASH_DEFAULT);
  85     }
  86 }
  87
  88 #endif