gre: move to a plugin

Move GRE folder under vnet to the plugin folder, and modify some of path
of the #inlude<header> to the new path.

Add a plugin.c file to register a plugin.

JIRA: VPP-2044

Type: improvement
Change-Id: I7f64cecd97538a7492e56a41558dab58281a9fa5
Signed-off-by: Chuhao Tang <nicotang@cisco.com>

1 files changed, 218 insertions, 0 deletions

diff --git a/src/plugins/gre/gre_api.c b/src/plugins/gre/gre_api.c
new file mode 100644
index 00000000000..f8e3ea654fc
--- /dev/null
+++ b/src/plugins/gre/gre_api.c
@@ -0,0 +1,218 @@
+/*
+ *------------------------------------------------------------------
+ * gre_api.c - gre 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 <vlibmemory/api.h>
+
+#include <vnet/interface.h>
+#include <vnet/api_errno.h>
+
+#include <gre/gre.h>
+#include <vnet/fib/fib_table.h>
+#include <vnet/tunnel/tunnel_types_api.h>
+#include <vnet/ip/ip_types_api.h>
+
+#include <gre/gre.api_enum.h>
+#include <gre/gre.api_types.h>
+
+#define REPLY_MSG_ID_BASE gre_main.msg_id_base
+#include <vlibapi/api_helper_macros.h>
+
+static int
+gre_tunnel_type_decode (vl_api_gre_tunnel_type_t in, gre_tunnel_type_t *out)
+{
+  switch (in)
+    {
+#define _(n, v)                                                               \
+  case GRE_API_TUNNEL_TYPE_##n:                                               \
+    *out = GRE_TUNNEL_TYPE_##n;                                               \
+    return (0);
+      foreach_gre_tunnel_type
+#undef _
+    }
+
+  return (VNET_API_ERROR_INVALID_VALUE);
+}
+
+static vl_api_gre_tunnel_type_t
+gre_tunnel_type_encode (gre_tunnel_type_t in)
+{
+  vl_api_gre_tunnel_type_t out = GRE_API_TUNNEL_TYPE_L3;
+
+  switch (in)
+    {
+#define _(n, v)                                                               \
+  case GRE_TUNNEL_TYPE_##n:                                                   \
+    out = GRE_API_TUNNEL_TYPE_##n;                                            \
+    break;
+      foreach_gre_tunnel_type
+#undef _
+    }
+
+  return (out);
+}
+
+static void
+vl_api_gre_tunnel_add_del_t_handler (vl_api_gre_tunnel_add_del_t *mp)
+{
+  vnet_gre_tunnel_add_del_args_t _a = {}, *a = &_a;
+  vl_api_gre_tunnel_add_del_reply_t *rmp;
+  tunnel_encap_decap_flags_t flags;
+  u32 sw_if_index = ~0;
+  ip46_type_t itype[2];
+  int rv = 0;
+
+  itype[0] = ip_address_decode (&mp->tunnel.src, &a->src);
+  itype[1] = ip_address_decode (&mp->tunnel.dst, &a->dst);
+
+  if (itype[0] != itype[1])
+    {
+      rv = VNET_API_ERROR_INVALID_PROTOCOL;
+      goto out;
+    }
+
+  if (ip46_address_is_equal (&a->src, &a->dst))
+    {
+      rv = VNET_API_ERROR_SAME_SRC_DST;
+      goto out;
+    }
+
+  rv = gre_tunnel_type_decode (mp->tunnel.type, &a->type);
+
+  if (rv)
+    goto out;
+
+  rv = tunnel_mode_decode (mp->tunnel.mode, &a->mode);
+
+  if (rv)
+    goto out;
+
+  rv = tunnel_encap_decap_flags_decode (mp->tunnel.flags, &flags);
+
+  if (rv)
+    goto out;
+
+  a->is_add = mp->is_add;
+  a->is_ipv6 = (itype[0] == IP46_TYPE_IP6);
+  a->instance = ntohl (mp->tunnel.instance);
+  a->session_id = ntohs (mp->tunnel.session_id);
+  a->outer_table_id = ntohl (mp->tunnel.outer_table_id);
+  a->flags = flags;
+
+  rv = vnet_gre_tunnel_add_del (a, &sw_if_index);
+
+out:
+  /* *INDENT-OFF* */
+  REPLY_MACRO2 (VL_API_GRE_TUNNEL_ADD_DEL_REPLY,
+		({ rmp->sw_if_index = ntohl (sw_if_index); }));
+  /* *INDENT-ON* */
+}
+
+static void
+send_gre_tunnel_details (gre_tunnel_t *t, vl_api_gre_tunnel_dump_t *mp)
+{
+  vl_api_gre_tunnel_details_t *rmp;
+
+  /* *INDENT-OFF* */
+  REPLY_MACRO_DETAILS2 (
+    VL_API_GRE_TUNNEL_DETAILS, ({
+      ip_address_encode (&t->tunnel_src, IP46_TYPE_ANY, &rmp->tunnel.src);
+      ip_address_encode (&t->tunnel_dst.fp_addr, IP46_TYPE_ANY,
+			 &rmp->tunnel.dst);
+
+      rmp->tunnel.outer_table_id = htonl (
+	fib_table_get_table_id (t->outer_fib_index, t->tunnel_dst.fp_proto));
+
+      rmp->tunnel.type = gre_tunnel_type_encode (t->type);
+      rmp->tunnel.mode = tunnel_mode_encode (t->mode);
+      rmp->tunnel.flags = tunnel_encap_decap_flags_encode (t->flags);
+      rmp->tunnel.instance = htonl (t->user_instance);
+      rmp->tunnel.sw_if_index = htonl (t->sw_if_index);
+      rmp->tunnel.session_id = htons (t->session_id);
+    }));
+  /* *INDENT-ON* */
+}
+
+static void
+vl_api_gre_tunnel_dump_t_handler (vl_api_gre_tunnel_dump_t *mp)
+{
+  vl_api_registration_t *reg;
+  gre_main_t *gm = &gre_main;
+  gre_tunnel_t *t;
+  u32 sw_if_index;
+
+  reg = vl_api_client_index_to_registration (mp->client_index);
+  if (!reg)
+    return;
+
+  sw_if_index = ntohl (mp->sw_if_index);
+
+  if (~0 == sw_if_index)
+    {
+      /* *INDENT-OFF* */
+      pool_foreach (t, gm->tunnels)
+	{
+	  send_gre_tunnel_details (t, mp);
+	}
+      /* *INDENT-ON* */
+    }
+
+  else
+    {
+      if ((sw_if_index >= vec_len (gm->tunnel_index_by_sw_if_index)) ||
+	  (~0 == gm->tunnel_index_by_sw_if_index[sw_if_index]))
+	{
+	  return;
+	}
+      t = &gm->tunnels[gm->tunnel_index_by_sw_if_index[sw_if_index]];
+      send_gre_tunnel_details (t, mp);
+    }
+}
+
+/*
+ * gre_api_hookup
+ * Add vpe's API message handlers to the table.
+ * vlib has already mapped shared memory and
+ * added the client registration handlers.
+ * See .../vlib-api/vlibmemory/memclnt_vlib.c:memclnt_process()
+ */
+/* API definitions */
+#include <vnet/format_fns.h>
+#include <gre/gre.api.c>
+
+static clib_error_t *
+gre_api_hookup (vlib_main_t *vm)
+{
+  /*
+   * Set up the (msg_name, crc, message-id) table
+   */
+  gre_main.msg_id_base = setup_message_id_table ();
+
+  return 0;
+}
+
+VLIB_API_INIT_FUNCTION (gre_api_hookup);
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */