Move the vnet cdp protocol implementation to a plugin

Add a binary API and debug cli to enable/disable cdp. cdp is disabled
by default.

Change-Id: I307c7e38dfda38e36ff3325f65de7036c34d89b1
Signed-off-by: Dave Barach <dave@barachs.net>

1 files changed, 222 insertions, 0 deletions

diff --git a/src/plugins/cdp/cdp.c b/src/plugins/cdp/cdp.c
new file mode 100644
index 00000000000..a88a06bc9c5
--- /dev/null
+++ b/src/plugins/cdp/cdp.c
@@ -0,0 +1,222 @@
+/*
+ * cdp.c - cdp protocol plug-in
+ *
+ * Copyright (c) 2011-2018 by 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 <vnet/plugin/plugin.h>
+#include <cdp/cdp.h>
+
+#include <vlibapi/api.h>
+#include <vlibmemory/api.h>
+#include <vpp/app/version.h>
+
+/* define message IDs */
+#include <cdp/cdp_msg_enum.h>
+
+/* define message structures */
+#define vl_typedefs
+#include <cdp/cdp_all_api_h.h>
+#undef vl_typedefs
+
+/* define generated endian-swappers */
+#define vl_endianfun
+#include <cdp/cdp_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 <cdp/cdp_all_api_h.h>
+#undef vl_printfun
+
+/* Get the API version number */
+#define vl_api_version(n,v) static u32 api_version=(v);
+#include <cdp/cdp_all_api_h.h>
+#undef vl_api_version
+
+/*
+ * A handy macro to set up a message reply.
+ * Assumes that the following variables are available:
+ * mp - pointer to request message
+ * rmp - pointer to reply message type
+ * rv - return value
+ */
+
+#define REPLY_MACRO(t)                                          \
+do {                                                            \
+    unix_shared_memory_queue_t * q =                            \
+    vl_api_client_index_to_input_queue (mp->client_index);      \
+    if (!q)                                                     \
+        return;                                                 \
+                                                                \
+    rmp = vl_msg_api_alloc (sizeof (*rmp));                     \
+    rmp->_vl_msg_id = ntohs((t)+cm->msg_id_base);               \
+    rmp->context = mp->context;                                 \
+    rmp->retval = ntohl(rv);                                    \
+                                                                \
+    vl_msg_api_send_shmem (q, (u8 *)&rmp);                      \
+} while(0);
+
+
+/* List of message types that this plugin understands */
+
+#define foreach_cdp_plugin_api_msg                           \
+_(CDP_ENABLE_DISABLE, cdp_enable_disable)
+
+/* Action function shared between message handler and debug CLI */
+
+int
+cdp_enable_disable (cdp_main_t * cm, int enable_disable)
+{
+  int rv = 0;
+
+  if (enable_disable)
+    vlib_process_signal_event (cm->vlib_main, cdp_process_node.index,
+			       CDP_EVENT_ENABLE, 0);
+  else
+    vlib_process_signal_event (cm->vlib_main, cdp_process_node.index,
+			       CDP_EVENT_DISABLE, 0);
+  cm->enabled = enable_disable;
+
+  return rv;
+}
+
+static clib_error_t *
+cdp_command_fn (vlib_main_t * vm,
+		unformat_input_t * input, vlib_cli_command_t * cmd)
+{
+  cdp_main_t *cm = &cdp_main;
+  int enable_disable = 1;
+
+  int rv;
+
+  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
+    {
+      if (unformat (input, "disable"))
+	enable_disable = 0;
+      else if (unformat (input, "enable"))
+	enable_disable = 1;
+      else
+	break;
+    }
+
+  rv = cdp_enable_disable (cm, enable_disable);
+
+  switch (rv)
+    {
+    case 0:
+      break;
+
+    default:
+      return clib_error_return (0, "cdp_enable_disable returned %d", rv);
+    }
+  return 0;
+}
+
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (cdp_command, static) =
+{
+  .path = "cdp",
+  .short_help = "cdp enable | disable",
+  .function = cdp_command_fn,
+};
+/* *INDENT-ON* */
+
+/* API message handler */
+static void vl_api_cdp_enable_disable_t_handler
+  (vl_api_cdp_enable_disable_t * mp)
+{
+  vl_api_cdp_enable_disable_reply_t *rmp;
+  cdp_main_t *cm = &cdp_main;
+  int rv;
+
+  rv = cdp_enable_disable (cm, (int) (mp->enable_disable));
+
+  REPLY_MACRO (VL_API_CDP_ENABLE_DISABLE_REPLY);
+}
+
+/* Set up the API message handling tables */
+static clib_error_t *
+cdp_plugin_api_hookup (vlib_main_t * vm)
+{
+  cdp_main_t *cm = &cdp_main;
+#define _(N,n)                                                  \
+    vl_msg_api_set_handlers((VL_API_##N + cm->msg_id_base),     \
+                           #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_cdp_plugin_api_msg;
+#undef _
+
+  return 0;
+}
+
+#define vl_msg_name_crc_list
+#include <cdp/cdp_all_api_h.h>
+#undef vl_msg_name_crc_list
+
+static void
+setup_message_id_table (cdp_main_t * cm, api_main_t * am)
+{
+#define _(id,n,crc)   vl_msg_api_add_msg_name_crc (am, #n  #crc, id + cm->msg_id_base);
+  foreach_vl_msg_name_crc_cdp;
+#undef _
+}
+
+static clib_error_t *
+cdp_init (vlib_main_t * vm)
+{
+  cdp_main_t *cm = &cdp_main;
+  clib_error_t *error = 0;
+  u8 *name;
+
+  cm->vlib_main = vm;
+
+  name = format (0, "cdp_%08x%c", api_version, 0);
+
+  /* Ask for a correctly-sized block of API message decode slots */
+  cm->msg_id_base = vl_msg_api_get_msg_ids
+    ((char *) name, VL_MSG_FIRST_AVAILABLE);
+
+  error = cdp_plugin_api_hookup (vm);
+
+  /* Add our API messages to the global name_crc hash table */
+  setup_message_id_table (cm, &api_main);
+
+  vec_free (name);
+
+  return error;
+}
+
+VLIB_INIT_FUNCTION (cdp_init);
+
+/* *INDENT-OFF* */
+VLIB_PLUGIN_REGISTER () =
+{
+  .version = VPP_BUILD_VER,
+};
+/* *INDENT-ON* */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */