L2 Emulation

L2 Emulation is a feautre that is applied to L2 ports to 'extract'
IP packets from the L2 path and inject them into the L3 path (i.e.
into the appropriate ip[4|6]_input node).
L3 routes in the table_id for that interface should then be configured
as DVR routes, therefore the forwarded packet has the L2 header
preserved and togehter the L3 routed system behaves like an L2 bridge.

Change-Id: I8effd7e2f4c67ee277b73c7bc79aa3e5a3e34d03
Signed-off-by: Neale Ranns <nranns@cisco.com>

1 files changed, 162 insertions, 0 deletions

diff --git a/src/plugins/l2e/l2e_api.c b/src/plugins/l2e/l2e_api.c
new file mode 100644
index 00000000000..470427e8952
--- /dev/null
+++ b/src/plugins/l2e/l2e_api.c
@@ -0,0 +1,162 @@
+/*
+ *------------------------------------------------------------------
+ * l2e_api.c - layer 2 emulation api
+ *
+ * Copyright (c) 2016 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 <vnet/interface.h>
+#include <vnet/api_errno.h>
+#include <vpp/app/version.h>
+
+#include <l2e/l2e.h>
+
+#include <vlibapi/api.h>
+#include <vlibmemory/api.h>
+
+/* define message IDs */
+#include <l2e/l2e_msg_enum.h>
+
+#define vl_typedefs		/* define message structures */
+#include <l2e/l2e_all_api_h.h>
+#undef vl_typedefs
+
+#define vl_endianfun		/* define message structures */
+#include <l2e/l2e_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 <l2e/l2e_all_api_h.h>
+#undef vl_printfun
+
+/* Get the API version number */
+#define vl_api_version(n,v) static u32 api_version=(v);
+#include <acl/acl_all_api_h.h>
+#undef vl_api_version
+
+#include <vlibapi/api_helper_macros.h>
+
+#define foreach_l2e_api_msg                                 \
+_(L2_EMULATION, l2_emulation)
+
+/**
+ * L2 Emulation Main
+ */
+typedef struct l2_emulation_main_t_
+{
+  u16 msg_id_base;
+} l2_emulation_main_t;
+
+static l2_emulation_main_t l2_emulation_main;
+
+#define L2E_MSG_BASE l2_emulation_main.msg_id_base
+
+static void
+vl_api_l2_emulation_t_handler (vl_api_l2_emulation_t * mp)
+{
+  vl_api_l2_emulation_reply_t *rmp;
+  int rv = 0;
+
+  VALIDATE_SW_IF_INDEX (mp);
+
+  u32 sw_if_index = ntohl (mp->sw_if_index);
+
+  if (mp->enable)
+    l2_emulation_enable (sw_if_index);
+  else
+    l2_emulation_disable (sw_if_index);
+
+  BAD_SW_IF_INDEX_LABEL;
+
+  REPLY_MACRO (VL_API_L2_EMULATION_REPLY + L2E_MSG_BASE);
+}
+
+/*
+ * l2_api_hookup
+ * Add vpe's API message handlers to the table.
+ * vlib has alread mapped shared memory and
+ * added the client registration handlers.
+ * See .../vlib-api/vlibmemory/memclnt_vlib.c:memclnt_process()
+ */
+#define vl_msg_name_crc_list
+#include <l2e/l2e_all_api_h.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 + L2E_MSG_BASE);
+  foreach_vl_msg_name_crc_l2e;
+#undef _
+}
+
+static void
+l2e_api_hookup (vlib_main_t * vm)
+{
+#define _(N,n)                                                  \
+    vl_msg_api_set_handlers(VL_API_##N + L2E_MSG_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_l2e_api_msg;
+#undef _
+}
+
+static clib_error_t *
+l2e_init (vlib_main_t * vm)
+{
+  api_main_t *am = &api_main;
+  l2_emulation_main_t *l2em = &l2_emulation_main;
+  u8 *name = format (0, "l2e_%08x%c", api_version, 0);
+
+  /* Ask for a correctly-sized block of API message decode slots */
+  l2em->msg_id_base = vl_msg_api_get_msg_ids ((char *) name,
+					      VL_MSG_FIRST_AVAILABLE);
+
+  l2e_api_hookup (vm);
+
+  /* Add our API messages to the global name_crc hash table */
+  setup_message_id_table (am);
+
+  vec_free (name);
+  return (NULL);
+}
+
+VLIB_API_INIT_FUNCTION (l2e_init);
+
+/* *INDENT-OFF* */
+VLIB_PLUGIN_REGISTER () = {
+    .version = VPP_BUILD_VER,
+    .description = "L2 Emulation",
+};
+/* *INDENT-ON* */
+
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */