1 files changed, 150 insertions, 0 deletions
diff --git a/vnet/vnet/gre/interface.c b/vnet/vnet/gre/interface.c
new file mode 100644
index 00000000000..72ce0962fc7
--- /dev/null
+++ b/vnet/vnet/gre/interface.c
@@ -0,0 +1,150 @@
+/*
+ * gre_interface.c: gre interfaces
+ *
+ * Copyright (c) 2012 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/pg/pg.h>
+#include <vnet/gre/gre.h>
+
+int
+gre_register_interface (vnet_main_t * vnm,
+                        u32 dev_class_index,
+                        ip4_address_t *tunnel_src,
+                        ip4_address_t *tunnel_dst,
+                        u32 outer_fib_id,
+                        u32 * gi_index_return)
+{
+  gre_main_t * gm = &gre_main;
+  ip4_main_t * im = &ip4_main;
+  gre_tunnel_t * t;
+  vnet_hw_interface_t * hi;
+  u32 hw_if_index;
+  u32 slot;
+  u32 outer_fib_index;
+  uword * p;
+
+  u64 key = (u64)tunnel_src->as_u32 << 32 | (u64)tunnel_dst->as_u32;
+
+  /* check if same src/dst pair exists */
+  if (hash_get (gm->tunnel_by_key, key))
+    return VNET_API_ERROR_INVALID_VALUE;
+
+  p = hash_get (im->fib_index_by_table_id, outer_fib_id);
+  if (! p)
+    return VNET_API_ERROR_NO_SUCH_FIB;
+
+  outer_fib_index = p[0];
+
+  pool_get (gm->tunnels, t);
+  memset (t, 0, sizeof (*t));
+
+  hw_if_index = vnet_register_interface
+    (vnm, gre_device_class.index, t - gm->tunnels,
+     gre_hw_interface_class.index,
+     t - gm->tunnels);
+
+  *gi_index_return = t - gm->tunnels;
+
+  t->hw_if_index = hw_if_index;
+  t->outer_fib_index = outer_fib_index;
+
+  hi = vnet_get_hw_interface (vnm, hw_if_index);
+
+  hi->min_packet_bytes = 64 + sizeof (gre_header_t) + sizeof (ip4_header_t);
+  hi->per_packet_overhead_bytes =
+    /* preamble */ 8 + /* inter frame gap */ 12;
+
+  /* Standard default gre MTU. */
+  hi->max_l3_packet_bytes[VLIB_RX] = hi->max_l3_packet_bytes[VLIB_TX] = 1500;
+
+  memcpy (&t->tunnel_src, tunnel_src, sizeof (t->tunnel_src));
+  memcpy (&t->tunnel_dst, tunnel_dst, sizeof (t->tunnel_dst));
+
+  hash_set (gm->tunnel_by_key, key, t - gm->tunnels);
+
+  slot = vlib_node_add_named_next_with_slot
+    (vnm->vlib_main, hi->tx_node_index, "ip4-lookup", GRE_OUTPUT_NEXT_LOOKUP);
+
+  ASSERT (slot == GRE_OUTPUT_NEXT_LOOKUP);
+
+  return 0;
+}
+
+
+static clib_error_t *
+create_gre_tunnel_command_fn (vlib_main_t * vm,
+		 unformat_input_t * input,
+		 vlib_cli_command_t * cmd)
+{
+  unformat_input_t _line_input, * line_input = &_line_input;
+  vnet_main_t * vnm = vnet_get_main();
+  ip4_address_t src, dst;
+  u32 outer_fib_id = 0;
+  int rv;
+  u32 gi_index;
+  u32 num_m_args = 0;
+
+  /* Get a line of input. */
+  if (! unformat_user (input, unformat_line_input, line_input))
+    return 0;
+
+  while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT) {
+    if (unformat (line_input, "src %U", unformat_ip4_address, &src))
+      num_m_args++;
+    else if (unformat (line_input, "dst %U", unformat_ip4_address, &dst))
+      num_m_args++;
+    else if (unformat (line_input, "outer-fib-id %d", &outer_fib_id))
+      ;
+    else
+      return clib_error_return (0, "unknown input `%U'",
+                                format_unformat_error, input);
+  }
+  unformat_free (line_input);
+
+  if (num_m_args < 2)
+      return clib_error_return (0, "mandatory argument(s) missing");
+
+  rv = gre_register_interface (vnm, gre_hw_interface_class.index,
+                                      &src, &dst, outer_fib_id, &gi_index);
+
+ switch(rv)
+    {
+    case 0:
+      break;
+    case VNET_API_ERROR_INVALID_VALUE:
+      return clib_error_return (0, "GRE tunnel already exists...");
+    case VNET_API_ERROR_NO_SUCH_FIB:
+      return clib_error_return (0, "outer fib ID %d doesn't exist\n",
+                                outer_fib_id);
+    default:
+      return clib_error_return (0, "gre_register_interface returned %d", rv);
+    }
+
+  return 0;
+}
+
+VLIB_CLI_COMMAND (create_gre_tunnel_command, static) = {
+  .path = "create gre tunnel",
+  .short_help = "create gre tunnel src <addr> dst <addr> [outer-fib-id <fib>]",
+  .function = create_gre_tunnel_command_fn,
+};
+
+/* force inclusion from application's main.c */
+clib_error_t *gre_interface_init (vlib_main_t *vm)
+{
+  return 0;
+}
+VLIB_INIT_FUNCTION(gre_interface_init);