[HICN-243] Adding router plugin

The original package is https://gerrit.fd.io/r/#/c/15062/ which was
compatible with VPP 18.10. This patch is the modification of the original
to be compatible with VPP 19.04. It was tested with FRR (i.e., OSPF).
Change-Id: I85d579b26be2ef68f1b4a1d54e5c599b3665574b
Signed-off-by: masoud hemmatpour <mhemmatp@cisco.com>

1 files changed, 380 insertions, 0 deletions

diff --git a/utils/extras/rtinject/tap_inject.c b/utils/extras/rtinject/tap_inject.c
new file mode 100644
index 000000000..f41ae86c8
--- /dev/null
+++ b/utils/extras/rtinject/tap_inject.c
@@ -0,0 +1,380 @@
+/*
+ * Copyright 2016 Intel Corporation
+ *
+ * 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 "tap_inject.h"
+
+#include <vnet/mfib/mfib_table.h>
+#include <vnet/ip/ip.h>
+#include <vnet/ip/lookup.h>
+#include <vnet/fib/fib.h>
+
+static tap_inject_main_t tap_inject_main;
+extern dpo_type_t tap_inject_dpo_type;
+
+tap_inject_main_t *
+tap_inject_get_main (void)
+{
+  return &tap_inject_main;
+}
+
+void
+tap_inject_insert_tap (u32 sw_if_index, u32 tap_fd, u32 tap_if_index)
+{
+  tap_inject_main_t * im = tap_inject_get_main ();
+
+  vec_validate_init_empty (im->sw_if_index_to_tap_fd, sw_if_index, ~0);
+  vec_validate_init_empty (im->sw_if_index_to_tap_if_index, sw_if_index, ~0);
+
+  vec_validate_init_empty (im->tap_fd_to_sw_if_index, tap_fd, ~0);
+
+  im->sw_if_index_to_tap_fd[sw_if_index] = tap_fd;
+  im->sw_if_index_to_tap_if_index[sw_if_index] = tap_if_index;
+
+  im->tap_fd_to_sw_if_index[tap_fd] = sw_if_index;
+
+  hash_set (im->tap_if_index_to_sw_if_index, tap_if_index, sw_if_index);
+}
+
+void
+tap_inject_delete_tap (u32 sw_if_index)
+{
+  tap_inject_main_t * im = tap_inject_get_main ();
+  u32 tap_fd = im->sw_if_index_to_tap_fd[sw_if_index];
+  u32 tap_if_index = im->sw_if_index_to_tap_if_index[sw_if_index];
+
+  im->sw_if_index_to_tap_if_index[sw_if_index] = ~0;
+  im->sw_if_index_to_tap_fd[sw_if_index] = ~0;
+  im->tap_fd_to_sw_if_index[tap_fd] = ~0;
+
+  hash_unset (im->tap_if_index_to_sw_if_index, tap_if_index);
+}
+
+u32
+tap_inject_lookup_tap_fd (u32 sw_if_index)
+{
+  tap_inject_main_t * im = tap_inject_get_main ();
+
+  vec_validate_init_empty (im->sw_if_index_to_tap_fd, sw_if_index, ~0);
+  return im->sw_if_index_to_tap_fd[sw_if_index];
+}
+
+u32
+tap_inject_lookup_sw_if_index_from_tap_fd (u32 tap_fd)
+{
+  tap_inject_main_t * im = tap_inject_get_main ();
+
+  vec_validate_init_empty (im->tap_fd_to_sw_if_index, tap_fd, ~0);
+  return im->tap_fd_to_sw_if_index[tap_fd];
+}
+
+u32
+tap_inject_lookup_sw_if_index_from_tap_if_index (u32 tap_if_index)
+{
+  tap_inject_main_t * im = tap_inject_get_main ();
+  uword * sw_if_index;
+
+  sw_if_index = hash_get (im->tap_if_index_to_sw_if_index, tap_if_index);
+  return sw_if_index ? *(u32 *)sw_if_index : ~0;
+}
+
+/* *INDENT-OFF* */
+VLIB_PLUGIN_REGISTER () = {
+    // .version = VPP_BUILD_VER, FIXME
+    .description = "router",
+};
+/* *INDENT-ON* */
+
+
+static void
+tap_inject_disable (void)
+{
+  tap_inject_main_t * im = tap_inject_get_main ();
+
+  im->flags &= ~TAP_INJECT_F_ENABLED;
+
+  clib_warning ("tap-inject is not actually disabled.");
+}
+
+static clib_error_t *
+tap_inject_enable (void)
+{
+  vlib_main_t * vm = vlib_get_main ();
+  tap_inject_main_t * im = tap_inject_get_main ();
+
+  if (tap_inject_is_enabled ())
+    return 0;
+
+  tap_inject_enable_netlink ();
+
+  /* Only enable netlink? */
+  if (im->flags & TAP_INJECT_F_CONFIG_NETLINK)
+    {
+      im->flags |= TAP_INJECT_F_ENABLED;
+      return 0;
+    }
+
+  /* Register ARP and ICMP6 as neighbor nodes. */
+  ethernet_register_input_type (vm, ETHERNET_TYPE_ARP, im->neighbor_node_index);
+  ip6_register_protocol (IP_PROTOCOL_ICMP6, im->neighbor_node_index);
+
+  /* Register remaining protocols. */
+  ip4_register_protocol (IP_PROTOCOL_ICMP, im->tx_node_index);
+
+  ip4_register_protocol (IP_PROTOCOL_OSPF, im->tx_node_index);
+  ip4_register_protocol (IP_PROTOCOL_TCP, im->tx_node_index);
+  ip4_register_protocol (IP_PROTOCOL_UDP, im->tx_node_index);
+
+  ip6_register_protocol (IP_PROTOCOL_OSPF, im->tx_node_index);
+  ip6_register_protocol (IP_PROTOCOL_TCP, im->tx_node_index);
+  ip6_register_protocol (IP_PROTOCOL_UDP, im->tx_node_index);
+
+  {
+    dpo_id_t dpo = DPO_INVALID;
+
+    const mfib_prefix_t pfx_224_0_0_0 = {
+        .fp_len = 24,
+        .fp_proto = FIB_PROTOCOL_IP4,
+        .fp_grp_addr = {
+            .ip4.as_u32 = clib_host_to_net_u32(0xe0000000),
+        },
+        .fp_src_addr = {
+            .ip4.as_u32 = 0,
+        },
+    };
+
+    dpo_set(&dpo, tap_inject_dpo_type, DPO_PROTO_IP4, ~0);
+
+    index_t repi = replicate_create(1, DPO_PROTO_IP4);
+    replicate_set_bucket(repi, 0, &dpo);
+
+    mfib_table_entry_special_add(0,
+                                 &pfx_224_0_0_0,
+                                 MFIB_SOURCE_API,
+                                 MFIB_ENTRY_FLAG_ACCEPT_ALL_ITF,
+                                 repi);
+
+    dpo_reset(&dpo);
+  }
+
+  im->flags |= TAP_INJECT_F_ENABLED;
+
+  return 0;
+}
+
+static uword
+tap_inject_iface_isr (vlib_main_t * vm, vlib_node_runtime_t * node,
+                      vlib_frame_t * f)
+{
+  tap_inject_main_t * im = tap_inject_get_main ();
+  vnet_hw_interface_t * hw;
+  u32 * hw_if_index;
+  clib_error_t * err = 0;
+
+  vec_foreach (hw_if_index, im->interfaces_to_enable)
+    {
+      hw = vnet_get_hw_interface (vnet_get_main (), *hw_if_index);
+
+      if (hw->hw_class_index == ethernet_hw_interface_class.index)
+        {
+          err = tap_inject_tap_connect (hw);
+          if (err)
+            break;
+        }
+    }
+
+  vec_foreach (hw_if_index, im->interfaces_to_disable)
+    tap_inject_tap_disconnect (*hw_if_index);
+
+  vec_free (im->interfaces_to_enable);
+  vec_free (im->interfaces_to_disable);
+
+  return err ? -1 : 0;
+}
+
+VLIB_REGISTER_NODE (tap_inject_iface_isr_node, static) = {
+  .function = tap_inject_iface_isr,
+  .name = "tap-inject-iface-isr",
+  .type = VLIB_NODE_TYPE_INPUT,
+  .state = VLIB_NODE_STATE_INTERRUPT,
+  .vector_size = sizeof (u32),
+};
+
+
+static clib_error_t *
+tap_inject_interface_add_del (struct vnet_main_t * vnet_main, u32 hw_if_index,
+                              u32 add)
+{
+  vlib_main_t * vm = vlib_get_main ();
+  tap_inject_main_t * im = tap_inject_get_main ();
+
+  if (!tap_inject_is_config_enabled ())
+    return 0;
+
+  tap_inject_enable ();
+
+  if (add)
+    vec_add1 (im->interfaces_to_enable, hw_if_index);
+  else
+    vec_add1 (im->interfaces_to_disable, hw_if_index);
+
+  vlib_node_set_interrupt_pending (vm, tap_inject_iface_isr_node.index);
+
+  return 0;
+}
+
+VNET_HW_INTERFACE_ADD_DEL_FUNCTION (tap_inject_interface_add_del);
+
+
+static clib_error_t *
+tap_inject_enable_disable_all_interfaces (int enable)
+{
+  vnet_main_t * vnet_main = vnet_get_main ();
+  tap_inject_main_t * im = tap_inject_get_main ();
+  vnet_hw_interface_t * interfaces;
+  vnet_hw_interface_t * hw;
+  u32 ** indices;
+
+  if (enable)
+    tap_inject_enable ();
+  else
+    tap_inject_disable ();
+
+  /* Collect all the interface indices. */
+  interfaces = vnet_main->interface_main.hw_interfaces;
+  indices = enable ? &im->interfaces_to_enable : &im->interfaces_to_disable;
+  pool_foreach (hw, interfaces, vec_add1 (*indices, hw - interfaces));
+
+  if (tap_inject_iface_isr (vlib_get_main (), 0, 0))
+    return clib_error_return (0, "tap-inject interface add del isr failed");
+
+  return 0;
+}
+
+static clib_error_t *
+tap_inject_cli (vlib_main_t * vm, unformat_input_t * input,
+                 vlib_cli_command_t * cmd)
+{
+  tap_inject_main_t * im = tap_inject_get_main ();
+
+  if (cmd->function_arg)
+    {
+      clib_error_t * err;
+
+      if (tap_inject_is_config_disabled ())
+        return clib_error_return (0,
+            "tap-inject is disabled in config, thus cannot be enabled.");
+
+      /* Enable */
+      err = tap_inject_enable_disable_all_interfaces (1);
+      if (err)
+        {
+          tap_inject_enable_disable_all_interfaces (0);
+          return err;
+        }
+
+      im->flags |= TAP_INJECT_F_CONFIG_ENABLE;
+    }
+  else
+    {
+      /* Disable */
+      tap_inject_enable_disable_all_interfaces (0);
+      im->flags &= ~TAP_INJECT_F_CONFIG_ENABLE;
+    }
+
+  return 0;
+}
+
+VLIB_CLI_COMMAND (tap_inject_enable_cmd, static) = {
+  .path = "enable tap-inject",
+  .short_help = "enable tap-inject",
+  .function = tap_inject_cli,
+  .function_arg = 1,
+};
+
+VLIB_CLI_COMMAND (tap_inject_disable_cmd, static) = {
+  .path = "disable tap-inject",
+  .short_help = "disable tap-inject",
+  .function = tap_inject_cli,
+  .function_arg = 0,
+};
+
+
+static clib_error_t *
+show_tap_inject (vlib_main_t * vm, unformat_input_t * input,
+                 vlib_cli_command_t * cmd)
+{
+  vnet_main_t * vnet_main = vnet_get_main ();
+  tap_inject_main_t * im = tap_inject_get_main ();
+  u32 k, v;
+
+  if (tap_inject_is_config_disabled ())
+    {
+      vlib_cli_output (vm, "tap-inject is disabled in config.\n");
+      return 0;
+    }
+
+  if (!tap_inject_is_enabled ())
+    {
+      vlib_cli_output (vm, "tap-inject is not enabled.\n");
+      return 0;
+    }
+
+  hash_foreach (k, v, im->tap_if_index_to_sw_if_index, {
+    vlib_cli_output (vm, "%U -> %U",
+            format_vnet_sw_interface_name, vnet_main,
+            vnet_get_sw_interface (vnet_main, v),
+            format_tap_inject_tap_name, k);
+  });
+
+  return 0;
+}
+
+VLIB_CLI_COMMAND (show_tap_inject_cmd, static) = {
+  .path = "show tap-inject",
+  .short_help = "show tap-inject",
+  .function = show_tap_inject,
+};
+
+
+static clib_error_t *
+tap_inject_config (vlib_main_t * vm, unformat_input_t * input)
+{
+  tap_inject_main_t * im = tap_inject_get_main ();
+
+  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
+    {
+      if (unformat (input, "enable"))
+        im->flags |= TAP_INJECT_F_CONFIG_ENABLE;
+
+      else if (unformat (input, "disable"))
+        im->flags |= TAP_INJECT_F_CONFIG_DISABLE;
+
+      else if (unformat (input, "netlink-only"))
+        im->flags |= TAP_INJECT_F_CONFIG_NETLINK;
+
+      else
+        return clib_error_return (0, "syntax error `%U'",
+                                  format_unformat_error, input);
+    }
+
+  if (tap_inject_is_config_enabled () && tap_inject_is_config_disabled ())
+    return clib_error_return (0,
+              "tap-inject cannot be both enabled and disabled.");
+
+  return 0;
+}
+
+VLIB_CONFIG_FUNCTION (tap_inject_config, "tap-inject");