feat: implement set strategy API for hicn-plugin

Ticket: HICN-829

Change-Id: I3dabc38e9cc2e06ebed14b9ed265d027f77b7e5f
Signed-off-by: Mauro Sardara <msardara@cisco.com>
(cherry picked from commit da0d60997bce1e40cc0b1c7b7f4f58df56bbead3)

4 files changed, 153 insertions, 4 deletions

diff --git a/ctrl/libhicnctrl/src/modules/CMakeLists.txt b/ctrl/libhicnctrl/src/modules/CMakeLists.txt
index b1b63a5f9..f7bd2f83a 100644
--- a/ctrl/libhicnctrl/src/modules/CMakeLists.txt
+++ b/ctrl/libhicnctrl/src/modules/CMakeLists.txt
@@ -66,12 +66,14 @@ if(BUILD_HICNPLUGIN AND ${CMAKE_SYSTEM_NAME} MATCHES "Linux")
     ${CMAKE_CURRENT_SOURCE_DIR}/hicn_plugin.c
     ${CMAKE_CURRENT_SOURCE_DIR}/hicn_plugin/listener.c
     ${CMAKE_CURRENT_SOURCE_DIR}/hicn_plugin/route.c
+    ${CMAKE_CURRENT_SOURCE_DIR}/hicn_plugin/strategy.c
   )
 
   list(APPEND HICN_PLUGIN_HEADER_FILES
-    ${CMAKE_CURRENT_SOURCE_DIR}/hicn_light/base.h
-    ${CMAKE_CURRENT_SOURCE_DIR}/hicn_light/listener.h
-    ${CMAKE_CURRENT_SOURCE_DIR}/hicn_light/route.h
+    ${CMAKE_CURRENT_SOURCE_DIR}/hicn_plugin/base.h
+    ${CMAKE_CURRENT_SOURCE_DIR}/hicn_plugin/listener.h
+    ${CMAKE_CURRENT_SOURCE_DIR}/hicn_plugin/route.h
+    ${CMAKE_CURRENT_SOURCE_DIR}/hicn_plugin/strategy.h
   )
 
   ##############################################################
diff --git a/ctrl/libhicnctrl/src/modules/hicn_plugin.c b/ctrl/libhicnctrl/src/modules/hicn_plugin.c
index b3963b46c..b8606daf7 100644
--- a/ctrl/libhicnctrl/src/modules/hicn_plugin.c
+++ b/ctrl/libhicnctrl/src/modules/hicn_plugin.c
@@ -39,6 +39,7 @@
 #include "hicn_plugin/base.h"  // hc_sock_vpp_data_t
 #include "hicn_plugin/listener.h"
 #include "hicn_plugin/route.h"
+#include "hicn_plugin/strategy.h"
 
 /******************************************************************************
  * Message helper types and aliases
@@ -241,7 +242,7 @@ int hc_sock_initialize_module(hc_sock_t *s) {
   s->ops.object_vft[OBJECT_TYPE_WLDR] = HC_MODULE_OBJECT_OPS_EMPTY;
   s->ops.object_vft[OBJECT_TYPE_POLICY] = HC_MODULE_OBJECT_OPS_EMPTY;
   s->ops.object_vft[OBJECT_TYPE_ROUTE] = vpp_route_module_ops;
-  s->ops.object_vft[OBJECT_TYPE_STRATEGY] = HC_MODULE_OBJECT_OPS_EMPTY;
+  s->ops.object_vft[OBJECT_TYPE_STRATEGY] = vpp_strategy_module_ops;
   s->ops.object_vft[OBJECT_TYPE_SUBSCRIPTION] = HC_MODULE_OBJECT_OPS_EMPTY;
   return 0;
 }
diff --git a/ctrl/libhicnctrl/src/modules/hicn_plugin/strategy.c b/ctrl/libhicnctrl/src/modules/hicn_plugin/strategy.c
new file mode 100644
index 000000000..f8f6536ff
--- /dev/null
+++ b/ctrl/libhicnctrl/src/modules/hicn_plugin/strategy.c
@@ -0,0 +1,118 @@
+/*
+ * Copyright (c) 2023 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 "base.h"
+#include "strategy.h"
+
+#include <vpp_plugins/hicn/hicn_enums.h>
+
+static int _ip_prefix_encode(const hicn_ip_address_t *address,
+                             int prefix_length, int family,
+                             vapi_type_prefix *out) {
+  out->len = prefix_length;
+  int ret = 0;
+
+  switch (family) {
+    case AF_INET:
+      memcpy(&out->address.un.ip4[0], &address->v4, 4);
+      out->address.af = ADDRESS_IP4;
+      break;
+    case AF_INET6:
+      memcpy(&out->address.un.ip6[0], &address->v6, 16);
+      out->address.af = ADDRESS_IP6;
+      break;
+    default:
+      // This should never happen
+      ret = -1;
+  }
+
+  return ret;
+}
+
+static vapi_enum_hicn_strategy _vpp_strategy_libhicn_to_hicnplugin_strategy(
+    strategy_type_t strategy) {
+  switch (strategy) {
+    case STRATEGY_TYPE_LOADBALANCER:
+      return HICN_STRATEGY_RR;
+    case STRATEGY_TYPE_LOCAL_REMOTE:
+      return HICN_STRATEGY_LR;
+    case STRATEGY_TYPE_REPLICATION:
+      return HICN_STRATEGY_RP;
+    case STRATEGY_TYPE_BESTPATH:
+      return HICN_STRATEGY_MW;
+    default:
+      return HICN_STRATEGY_NULL;
+  }
+}
+
+static vapi_error_e _hicn_strategy_set_cb(
+    vapi_ctx_t ctx, void *callback_ctx, vapi_error_e rv, bool is_last,
+    vapi_payload_hicn_api_strategy_set_reply *reply) {
+  if (reply == NULL || rv != VAPI_OK) return rv;
+  return reply->retval;
+}
+
+static int _vpp_strategy_set(hc_sock_vpp_data_t *s,
+                             const hc_strategy_t *strategy) {
+  int ret = -1;
+
+  // Convert libhicn strategy enum to hicnplugin strategy enum and make sure it
+  // is valid
+  vapi_enum_hicn_strategy strategy_id =
+      _vpp_strategy_libhicn_to_hicnplugin_strategy(strategy->type);
+
+  if (strategy_id == HICN_STRATEGY_NULL) {
+    return -1;
+  }
+
+  // Construct API message
+  vapi_msg_hicn_api_strategy_set *msg =
+      vapi_alloc_hicn_api_strategy_set(s->g_vapi_ctx_instance);
+
+  // Fill it
+  msg->payload.strategy_id = clib_host_to_net_u32(strategy_id);
+  ret = _ip_prefix_encode(&strategy->address, strategy->len, strategy->family,
+                          &msg->payload.prefix);
+
+  if (ret != 0) {
+    return -1;
+  }
+
+  vapi_lock();
+  ret = vapi_hicn_api_strategy_set(s->g_vapi_ctx_instance, msg,
+                                   _hicn_strategy_set_cb, NULL);
+  vapi_unlock();
+
+  return ret;
+}
+
+int vpp_strategy_create(hc_sock_t *sock, hc_object_t *object, hc_data_t *data) {
+  return -1;
+}
+
+int vpp_strategy_delete(hc_sock_t *sock, hc_object_t *object, hc_data_t *data) {
+  return -1;
+}
+
+int vpp_strategy_list(hc_sock_t *sock, hc_object_t *object, hc_data_t *data) {
+  return -1;
+}
+
+int vpp_strategy_set(hc_sock_t *sock, hc_object_t *object, hc_data_t *data) {
+  hc_sock_vpp_data_t *s = (hc_sock_vpp_data_t *)sock->data;
+  return _vpp_strategy_set(s, &object->strategy);
+}
+
+DECLARE_VPP_MODULE_OBJECT_OPS(vpp, strategy);
diff --git a/ctrl/libhicnctrl/src/modules/hicn_plugin/strategy.h b/ctrl/libhicnctrl/src/modules/hicn_plugin/strategy.h
new file mode 100644
index 000000000..6dd6df6e4
--- /dev/null
+++ b/ctrl/libhicnctrl/src/modules/hicn_plugin/strategy.h
@@ -0,0 +1,28 @@
+/*
+ * Copyright (c) 2023 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.
+ */
+
+/**
+ * \file modules/hicn_plugin/route.h
+ * \brief route object VFT for hicn_plugin.
+ */
+
+#ifndef HICNCTRL_MODULE_VPP_STRATEGY_H
+#define HICNCTRL_MODULE_VPP_STRATEGY_H
+
+#include "../../module.h"
+
+DECLARE_MODULE_OBJECT_OPS_H(vpp, strategy);
+
+#endif /* HICNCTRL_MODULE_VPP_STRATEGY_H */