feat: local-remote strategy

Ticket: HICN-824

Change-Id: Iea285cb499b13c943a142fa39328ee36c91ae913
Signed-off-by: Mauro Sardara <msardara@cisco.com>
(cherry picked from commit 7560918629eb11aa7bdaee5f4856243b38c77f93)

1 files changed, 136 insertions, 0 deletions

diff --git a/hicn-plugin/src/strategies/strategy_lr.c b/hicn-plugin/src/strategies/strategy_lr.c
new file mode 100644
index 000000000..6bb4097ec
--- /dev/null
+++ b/hicn-plugin/src/strategies/strategy_lr.c
@@ -0,0 +1,136 @@
+/*
+ * Copyright (c) 2021 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 "dpo_lr.h"
+#include "../strategy.h"
+#include "../strategy_dpo_ctx.h"
+#include "../faces/face.h"
+#include "../strategy_dpo_manager.h"
+
+/* Simple strategy that forwards intertests to all next hops */
+/* It does not require to exend the hicn_dpo */
+void hicn_receive_data_lr (index_t dpo_idx, int nh_idx);
+void hicn_add_interest_lr (index_t dpo_idx);
+int hicn_send_after_aggregation_lr (index_t dpo_idx, hicn_face_id_t in_face);
+void hicn_on_interest_timeout_lr (index_t dpo_idx);
+u32 hicn_select_next_hop_lr (index_t dpo_idx, hicn_face_id_t in_face,
+			     hicn_face_id_t *outfaces, u16 *len);
+u8 *hicn_strategy_format_trace_lr (u8 *s, hicn_strategy_trace_t *t);
+u8 *hicn_strategy_format_lr (u8 *s, va_list *ap);
+
+static hicn_strategy_vft_t hicn_strategy_lr_vft = {
+  .hicn_receive_data = &hicn_receive_data_lr,
+  .hicn_add_interest = &hicn_add_interest_lr,
+  .hicn_send_after_aggregation = &hicn_send_after_aggregation_lr,
+  .hicn_on_interest_timeout = &hicn_on_interest_timeout_lr,
+  .hicn_select_next_hop = &hicn_select_next_hop_lr,
+  .hicn_format_strategy_trace = &hicn_strategy_format_trace_lr,
+  .hicn_format_strategy = &hicn_strategy_format_lr
+};
+
+/*
+ * Return the vft of the strategy.
+ */
+hicn_strategy_vft_t *
+hicn_lr_strategy_get_vft (void)
+{
+  return &hicn_strategy_lr_vft;
+}
+
+/* DPO should be given in input as it containes all the information to
+ * calculate the next hops*/
+u32
+hicn_select_next_hop_lr (index_t dpo_idx, hicn_face_id_t in_face,
+			 hicn_face_id_t *outfaces, u16 *len)
+{
+  hicn_dpo_ctx_t *dpo_ctx = hicn_strategy_dpo_ctx_get (dpo_idx);
+
+  *len = 0;
+
+  if (dpo_ctx == NULL || dpo_ctx->entry_count == 0)
+    {
+      return HICN_ERROR_STRATEGY_NOT_FOUND;
+    }
+
+  // Check if input face is local face
+  int in_is_local = hicn_face_is_local (in_face);
+
+  int i = 0;
+  while (i < MAX_OUT_FACES && i < dpo_ctx->entry_count)
+    {
+      if (hicn_face_is_local (dpo_ctx->next_hops[i]) != in_is_local)
+	{
+	  outfaces[0] = dpo_ctx->next_hops[i];
+	  *len = 1;
+	  break;
+	}
+
+      i++;
+    }
+
+  return HICN_ERROR_NONE;
+}
+
+void
+hicn_add_interest_lr (index_t dpo_ctx_idx)
+{
+  /* Nothing to do */
+}
+
+int
+hicn_send_after_aggregation_lr (index_t dpo_idx, hicn_face_id_t in_face)
+{
+  if (hicn_face_is_local (in_face))
+    {
+      return true;
+    }
+
+  return false;
+}
+
+void
+hicn_on_interest_timeout_lr (index_t dpo_idx)
+{
+  /* Nothing to do in the lr strategy when we receive an interest */
+}
+
+void
+hicn_receive_data_lr (index_t dpo_idx, int nh_idx)
+{
+  /* nothing to do */
+}
+
+/* packet trace format function */
+u8 *
+hicn_strategy_format_trace_lr (u8 *s, hicn_strategy_trace_t *t)
+{
+  s = format (s,
+	      "Strategy_lr: pkt: %d, sw_if_index %d, next index %d, dpo_type "
+	      "%d, out_face %d",
+	      (int) t->pkt_type, t->sw_if_index, t->next_index, t->dpo_type,
+	      t->out_face);
+  return (s);
+}
+
+u8 *
+hicn_strategy_format_lr (u8 *s, va_list *ap)
+{
+
+  u32 indent = va_arg (*ap, u32);
+  s = format (
+    s, "Local-Remote: send from local face to remote only and viceversa \n",
+    indent);
+  return (s);
+}