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/ip/udp.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/ip6_fib.h>
  26 #include <vnet/fib/ip4_fib.h>
  27 #include <vnet/fib/fib_entry.h>
  28
  29 /* Statistics (not really errors) */
  30 #define foreach_vxlan_gpe_transit_ioam_error    \
  31 _(ENCAPSULATED, "good packets encapsulated")
  32
  33 static char *vxlan_gpe_transit_ioam_error_strings[] = {
  34 #define _(sym,string) string,
  35   foreach_vxlan_gpe_transit_ioam_error
  36 #undef _
  37 };
  38
  39 typedef enum
  40 {
  41 #define _(sym,str) VXLAN_GPE_TRANSIT_IOAM_ERROR_##sym,
  42   foreach_vxlan_gpe_transit_ioam_error
  43 #undef _
  44     VXLAN_GPE_TRANSIT_IOAM_N_ERROR,
  45 } vxlan_gpe_transit_ioam_error_t;
  46
  47 typedef enum
  48 {
  49   VXLAN_GPE_TRANSIT_IOAM_NEXT_OUTPUT,
  50   VXLAN_GPE_TRANSIT_IOAM_NEXT_DROP,
  51   VXLAN_GPE_TRANSIT_IOAM_N_NEXT
  52 } vxlan_gpe_transit_ioam_next_t;
  53
  54
  55 /* *INDENT-OFF* */
  56 VNET_FEATURE_INIT (vxlan_gpe_transit_ioam, static) =
  57 {
  58   .arc_name = "ip4-output",
  59   .node_name = "vxlan-gpe-transit-ioam",
  60   .runs_before = VNET_FEATURES ("interface-output"),
  61 };
  62 /* *INDENT-ON* */
  63
  64 static uword
  65 vxlan_gpe_transit_ioam (vlib_main_t * vm,
  66                         vlib_node_runtime_t * node, vlib_frame_t * from_frame)
  67 {
  68   u32 n_left_from, next_index, *from, *to_next;
  69
  70   from = vlib_frame_vector_args (from_frame);
  71   n_left_from = from_frame->n_vectors;
  72
  73   next_index = node->cached_next_index;
  74
  75   while (n_left_from > 0)
  76     {
  77       u32 n_left_to_next;
  78
  79       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
  80
  81
  82       while (n_left_from > 0 && n_left_to_next > 0)
  83         {
  84           u32 bi0;
  85           vlib_buffer_t *b0;
  86           u32 next0 = VXLAN_GPE_TRANSIT_IOAM_NEXT_OUTPUT;
  87
  88           bi0 = from[0];
  89           to_next[0] = bi0;
  90           from += 1;
  91           to_next += 1;
  92           n_left_from -= 1;
  93           n_left_to_next -= 1;
  94           ip4_header_t *ip0;
  95           u32 iph_offset = 0;
  96
  97           b0 = vlib_get_buffer (vm, bi0);
  98           iph_offset = vnet_buffer (b0)->ip.save_rewrite_length;
  99           ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0)
 100                                   + iph_offset);
 101
 102           /* just forward non ipv4 packets */
 103           if (PREDICT_FALSE
 104               ((ip0->ip_version_and_header_length & 0xF0) == 0x40))
 105             {
 106               /* ipv4 packets */
 107               udp_header_t *udp_hdr0 = (udp_header_t *) (ip0 + 1);
 108               if (PREDICT_FALSE
 109                   ((ip0->protocol == IP_PROTOCOL_UDP) &&
 110                    (clib_net_to_host_u16 (udp_hdr0->dst_port) ==
 111                     UDP_DST_PORT_vxlan_gpe)))
 112                 {
 113
 114                   /* Check the iOAM header */
 115                   vxlan_gpe_header_t *gpe_hdr0 =
 116                     (vxlan_gpe_header_t *) (udp_hdr0 + 1);
 117
 118                   if (PREDICT_FALSE
 119                       (gpe_hdr0->protocol == VXLAN_GPE_PROTOCOL_IOAM))
 120                     {
 121                       uword *t = NULL;
 122                       vxlan_gpe_ioam_main_t *hm = &vxlan_gpe_ioam_main;
 123                       fib_prefix_t key4;
 124                       memset (&key4, 0, sizeof (key4));
 125                       key4.fp_proto = FIB_PROTOCOL_IP4;
 126                       key4.fp_addr.ip4.as_u32 = ip0->dst_address.as_u32;
 127                       t = hash_get_mem (hm->dst_by_ip4, &key4);
 128                       if (t)
 129                         {
 130
 131
 132                           vlib_buffer_advance (b0,
 133                                                (word) (sizeof
 134                                                        (ethernet_header_t)));
 135                           vxlan_gpe_encap_decap_ioam_v4_one_inline (vm, node,
 136                                                                     b0,
 137                                                                     &next0,
 138                                                                     VXLAN_GPE_TRANSIT_IOAM_NEXT_DROP,
 139                                                                     1
 140                                                                     /* use_adj */
 141                             );
 142                           vlib_buffer_advance (b0,
 143                                                -(word) (sizeof
 144                                                         (ethernet_header_t)));
 145                         }
 146                     }
 147                 }
 148             }
 149
 150           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
 151                                            n_left_to_next, bi0, next0);
 152         }
 153
 154       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 155     }
 156
 157   return from_frame->n_vectors;
 158 }
 159
 160 /* *INDENT-OFF* */
 161 VLIB_REGISTER_NODE (vxlan_gpe_transit_ioam_node) = {
 162   .function = vxlan_gpe_transit_ioam,
 163   .name = "vxlan-gpe-transit-ioam",
 164   .vector_size = sizeof (u32),
 165   .format_trace = format_vxlan_gpe_ioam_v4_trace,
 166   .type = VLIB_NODE_TYPE_INTERNAL,
 167
 168   .n_errors = ARRAY_LEN(vxlan_gpe_transit_ioam_error_strings),
 169   .error_strings = vxlan_gpe_transit_ioam_error_strings,
 170
 171   .n_next_nodes = VXLAN_GPE_TRANSIT_IOAM_N_NEXT,
 172
 173   .next_nodes = {
 174         [VXLAN_GPE_TRANSIT_IOAM_NEXT_OUTPUT] = "interface-output",
 175         [VXLAN_GPE_TRANSIT_IOAM_NEXT_DROP] = "error-drop",
 176   },
 177
 178 };
 179 /* *INDENT-ON* */
 180
 181
 182 /*
 183  * fd.io coding-style-patch-verification: ON
 184  *
 185  * Local Variables:
 186  * eval: (c-set-style "gnu")
 187  * End:
 188  */