src/plugins/ioam/lib-vxlan-gpe/ioam_transit.c

   1  /*
   2   * Copyright (c) 2015 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 #include <vppinfra/error.h>
  16 #include <vppinfra/hash.h>
  17 #include <vnet/vnet.h>
  18 #include <vnet/ip/ip.h>
  19 #include <vnet/udp/udp_local.h>
  20 #include <vnet/ethernet/ethernet.h>
  21 #include <vnet/vxlan-gpe/vxlan_gpe.h>
  22 #include <ioam/lib-vxlan-gpe/vxlan_gpe_ioam_packet.h>
  23 #include <ioam/lib-vxlan-gpe/vxlan_gpe_ioam.h>
  24 #include <ioam/lib-vxlan-gpe/vxlan_gpe_ioam_util.h>
  25 #include <vnet/fib/ip4_fib.h>
  26 #include <vnet/fib/fib_entry.h>
  27
  28 /* Statistics (not really errors) */
  29 #define foreach_vxlan_gpe_transit_ioam_error    \
  30 _(ENCAPSULATED, "good packets encapsulated")
  31
  32 static char *vxlan_gpe_transit_ioam_error_strings[] = {
  33 #define _(sym,string) string,
  34   foreach_vxlan_gpe_transit_ioam_error
  35 #undef _
  36 };
  37
  38 typedef enum
  39 {
  40 #define _(sym,str) VXLAN_GPE_TRANSIT_IOAM_ERROR_##sym,
  41   foreach_vxlan_gpe_transit_ioam_error
  42 #undef _
  43     VXLAN_GPE_TRANSIT_IOAM_N_ERROR,
  44 } vxlan_gpe_transit_ioam_error_t;
  45
  46 typedef enum
  47 {
  48   VXLAN_GPE_TRANSIT_IOAM_NEXT_OUTPUT,
  49   VXLAN_GPE_TRANSIT_IOAM_NEXT_DROP,
  50   VXLAN_GPE_TRANSIT_IOAM_N_NEXT
  51 } vxlan_gpe_transit_ioam_next_t;
  52
  53
  54 VNET_FEATURE_INIT (vxlan_gpe_transit_ioam, static) =
  55 {
  56   .arc_name = "ip4-output",
  57   .node_name = "vxlan-gpe-transit-ioam",
  58   .runs_before = VNET_FEATURES ("interface-output"),
  59 };
  60
  61 static uword
  62 vxlan_gpe_transit_ioam (vlib_main_t * vm,
  63                         vlib_node_runtime_t * node, vlib_frame_t * from_frame)
  64 {
  65   u32 n_left_from, next_index, *from, *to_next;
  66
  67   from = vlib_frame_vector_args (from_frame);
  68   n_left_from = from_frame->n_vectors;
  69
  70   next_index = node->cached_next_index;
  71
  72   while (n_left_from > 0)
  73     {
  74       u32 n_left_to_next;
  75
  76       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
  77
  78
  79       while (n_left_from > 0 && n_left_to_next > 0)
  80         {
  81           u32 bi0;
  82           vlib_buffer_t *b0;
  83           u32 next0 = VXLAN_GPE_TRANSIT_IOAM_NEXT_OUTPUT;
  84
  85           bi0 = from[0];
  86           to_next[0] = bi0;
  87           from += 1;
  88           to_next += 1;
  89           n_left_from -= 1;
  90           n_left_to_next -= 1;
  91           ip4_header_t *ip0;
  92           u32 iph_offset = 0;
  93
  94           b0 = vlib_get_buffer (vm, bi0);
  95           iph_offset = vnet_buffer (b0)->ip.save_rewrite_length;
  96           ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0)
  97                                   + iph_offset);
  98
  99           /* just forward non ipv4 packets */
 100           if (PREDICT_FALSE
 101               ((ip0->ip_version_and_header_length & 0xF0) == 0x40))
 102             {
 103               /* ipv4 packets */
 104               udp_header_t *udp_hdr0 = (udp_header_t *) (ip0 + 1);
 105               if (PREDICT_FALSE
 106                   ((ip0->protocol == IP_PROTOCOL_UDP) &&
 107                    (clib_net_to_host_u16 (udp_hdr0->dst_port) ==
 108                     UDP_DST_PORT_VXLAN_GPE)))
 109                 {
 110
 111                   /* Check the iOAM header */
 112                   vxlan_gpe_header_t *gpe_hdr0 =
 113                     (vxlan_gpe_header_t *) (udp_hdr0 + 1);
 114
 115                   if (PREDICT_FALSE
 116                       (gpe_hdr0->protocol == VXLAN_GPE_PROTOCOL_IOAM))
 117                     {
 118                       uword *t = NULL;
 119                       vxlan_gpe_ioam_main_t *hm = &vxlan_gpe_ioam_main;
 120                       fib_prefix_t key4;
 121                       clib_memset (&key4, 0, sizeof (key4));
 122                       key4.fp_proto = FIB_PROTOCOL_IP4;
 123                       key4.fp_addr.ip4.as_u32 = ip0->dst_address.as_u32;
 124                       t = hash_get_mem (hm->dst_by_ip4, &key4);
 125                       if (t)
 126                         {
 127
 128
 129                           vlib_buffer_advance (b0,
 130                                                (word) (sizeof
 131                                                        (ethernet_header_t)));
 132                           vxlan_gpe_encap_decap_ioam_v4_one_inline (vm, node,
 133                                                                     b0,
 134                                                                     &next0,
 135                                                                     VXLAN_GPE_TRANSIT_IOAM_NEXT_DROP,
 136                                                                     1
 137                                                                     /* use_adj */
 138                             );
 139                           vlib_buffer_advance (b0,
 140                                                -(word) (sizeof
 141                                                         (ethernet_header_t)));
 142                         }
 143                     }
 144                 }
 145             }
 146
 147           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
 148                                            n_left_to_next, bi0, next0);
 149         }
 150
 151       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 152     }
 153
 154   return from_frame->n_vectors;
 155 }
 156
 157 VLIB_REGISTER_NODE (vxlan_gpe_transit_ioam_node) = {
 158   .function = vxlan_gpe_transit_ioam,
 159   .name = "vxlan-gpe-transit-ioam",
 160   .vector_size = sizeof (u32),
 161   .format_trace = format_vxlan_gpe_ioam_v4_trace,
 162   .type = VLIB_NODE_TYPE_INTERNAL,
 163
 164   .n_errors = ARRAY_LEN(vxlan_gpe_transit_ioam_error_strings),
 165   .error_strings = vxlan_gpe_transit_ioam_error_strings,
 166
 167   .n_next_nodes = VXLAN_GPE_TRANSIT_IOAM_N_NEXT,
 168
 169   .next_nodes = {
 170         [VXLAN_GPE_TRANSIT_IOAM_NEXT_OUTPUT] = "interface-output",
 171         [VXLAN_GPE_TRANSIT_IOAM_NEXT_DROP] = "error-drop",
 172   },
 173
 174 };
 175
 176
 177 /*
 178  * fd.io coding-style-patch-verification: ON
 179  *
 180  * Local Variables:
 181  * eval: (c-set-style "gnu")
 182  * End:
 183  */