UDP Encapsulation.

A UDP-encap object that particiapates in the FIB graph and contributes
DPO to teh output chain. It thereofre resembles a tunnel but without the
interface. FIB paths (and henace routes) can then be created to egress
through the UDP-encap. Said routes can have MPLS labels, hence this also
allows MPLSoUPD.
Encap is uni-directional. For decap, one still registers with the UDP port
dispatcher.

Change-Id: I23bd345523b20789a1de1b02022ea1148ca50797
Signed-off-by: Neale Ranns <nranns@cisco.com>

1 files changed, 193 insertions, 0 deletions

diff --git a/src/vnet/udp/udp_api.c b/src/vnet/udp/udp_api.c
new file mode 100644
index 00000000000..e65235a5396
--- /dev/null
+++ b/src/vnet/udp/udp_api.c
@@ -0,0 +1,193 @@
+/*
+ * Copyright (c) 2017 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <vnet/vnet.h>
+#include <vlibmemory/api.h>
+
+#include <vnet/udp/udp_encap.h>
+#include <vnet/fib/fib_table.h>
+
+#include <vnet/vnet_msg_enum.h>
+
+#define vl_typedefs		/* define message structures */
+#include <vnet/vnet_all_api_h.h>
+#undef vl_typedefs
+
+#define vl_endianfun		/* define message structures */
+#include <vnet/vnet_all_api_h.h>
+#undef vl_endianfun
+
+/* instantiate all the print functions we know about */
+#define vl_print(handle, ...) vlib_cli_output (handle, __VA_ARGS__)
+#define vl_printfun
+#include <vnet/vnet_all_api_h.h>
+#undef vl_printfun
+
+#include <vlibapi/api_helper_macros.h>
+
+
+#define foreach_udp_api_msg                      \
+  _(UDP_ENCAP_ADD_DEL, udp_encap_add_del)        \
+_(UDP_ENCAP_DUMP, udp_encap_dump)
+
+static void
+send_udp_encap_details (const udp_encap_t * ue,
+			unix_shared_memory_queue_t * q, u32 context)
+{
+  vl_api_udp_encap_details_t *mp;
+  fib_table_t *fib_table;
+
+  mp = vl_msg_api_alloc (sizeof (*mp));
+  memset (mp, 0, sizeof (*mp));
+  mp->_vl_msg_id = ntohs (VL_API_UDP_ENCAP_DETAILS);
+  mp->context = context;
+
+  mp->is_ip6 = (ue->ue_ip_proto == FIB_PROTOCOL_IP6);
+
+  if (FIB_PROTOCOL_IP4 == ue->ue_ip_proto)
+    {
+      clib_memcpy (mp->src_ip, &ue->ue_hdrs.ip4.ue_ip4.src_address, 4);
+      clib_memcpy (mp->dst_ip, &ue->ue_hdrs.ip4.ue_ip4.dst_address, 4);
+      mp->src_port = htons (ue->ue_hdrs.ip4.ue_udp.src_port);
+      mp->dst_port = htons (ue->ue_hdrs.ip4.ue_udp.dst_port);
+    }
+  else
+    {
+      clib_memcpy (mp->src_ip, &ue->ue_hdrs.ip6.ue_ip6.src_address, 16);
+      clib_memcpy (mp->dst_ip, &ue->ue_hdrs.ip6.ue_ip6.dst_address, 16);
+      mp->src_port = htons (ue->ue_hdrs.ip6.ue_udp.src_port);
+      mp->dst_port = htons (ue->ue_hdrs.ip6.ue_udp.dst_port);
+    }
+
+  fib_table = fib_table_get (ue->ue_fib_index, ue->ue_ip_proto);
+  mp->table_id = htonl (fib_table->ft_table_id);
+  mp->id = htonl (ue->ue_id);
+
+  vl_msg_api_send_shmem (q, (u8 *) & mp);
+}
+
+static void
+vl_api_udp_encap_dump_t_handler (vl_api_udp_encap_dump_t * mp,
+				 vlib_main_t * vm)
+{
+  unix_shared_memory_queue_t *q;
+  udp_encap_t *ue;
+
+  q = vl_api_client_index_to_input_queue (mp->client_index);
+  if (q == 0)
+    return;
+
+  /* *INDENT-OFF* */
+  pool_foreach(ue, udp_encap_pool,
+  ({
+    send_udp_encap_details(ue, q, mp->context);
+  }));
+  /* *INDENT-OFF* */
+}
+
+static void
+vl_api_udp_encap_add_del_t_handler (vl_api_udp_encap_add_del_t * mp,
+                                    vlib_main_t * vm)
+{
+  vl_api_udp_encap_add_del_reply_t *rmp;
+  ip46_address_t src_ip, dst_ip;
+  u32 fib_index, table_id, ue_id;
+  fib_protocol_t fproto;
+  int rv = 0;
+
+  ue_id = ntohl(mp->id);
+  table_id = ntohl(mp->table_id);
+  fproto = (mp->is_ip6 ? FIB_PROTOCOL_IP6 : FIB_PROTOCOL_IP4);
+
+  fib_index = fib_table_find(fproto, table_id);
+
+  if (~0 == fib_index)
+    {
+      rv = VNET_API_ERROR_NO_SUCH_TABLE;
+      goto done;
+    }
+
+  if (FIB_PROTOCOL_IP4 == fproto)
+    {
+      clib_memcpy(&src_ip.ip4, mp->src_ip, 4);
+      clib_memcpy(&dst_ip.ip4, mp->dst_ip, 4);
+    }
+  else
+    {
+      clib_memcpy(&src_ip.ip6, mp->src_ip, 16);
+      clib_memcpy(&dst_ip.ip6, mp->dst_ip, 16);
+    }
+
+  if (mp->is_add)
+    {
+      udp_encap_add_and_lock(ue_id, fproto, fib_index,
+                             &src_ip, &dst_ip,
+                             ntohs(mp->src_port),
+                             ntohs(mp->dst_port),
+                             UDP_ENCAP_FIXUP_NONE);
+    }
+  else
+    {
+      udp_encap_unlock(ue_id);
+    }
+
+ done:
+  REPLY_MACRO (VL_API_UDP_ENCAP_ADD_DEL_REPLY);
+}
+
+#define vl_msg_name_crc_list
+#include <vnet/udp/udp.api.h>
+#undef vl_msg_name_crc_list
+
+static void
+setup_message_id_table (api_main_t * am)
+{
+#define _(id,n,crc) vl_msg_api_add_msg_name_crc (am, #n "_" #crc, id);
+  foreach_vl_msg_name_crc_udp;
+#undef _
+}
+
+static clib_error_t *
+udp_api_hookup (vlib_main_t * vm)
+{
+  api_main_t *am = &api_main;
+
+#define _(N,n)                                                  \
+    vl_msg_api_set_handlers(VL_API_##N, #n,                     \
+                           vl_api_##n##_t_handler,              \
+                           vl_noop_handler,                     \
+                           vl_api_##n##_t_endian,               \
+                           vl_api_##n##_t_print,                \
+                           sizeof(vl_api_##n##_t), 1);
+  foreach_udp_api_msg;
+#undef _
+
+  /*
+   * Set up the (msg_name, crc, message-id) table
+   */
+  setup_message_id_table (am);
+
+  return 0;
+}
+
+VLIB_API_INIT_FUNCTION (udp_api_hookup);
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */