[HICN-606] Added doxygen documentation

Signed-off-by: Alberto Compagno <acompagn+fdio@cisco.com>
Change-Id: If2bf7f4f310adf6adbbb9ea29eafcb2a0ee40d54

3 files changed, 74 insertions, 7 deletions

diff --git a/hicn-plugin/src/udp_tunnels/udp_decap.h b/hicn-plugin/src/udp_tunnels/udp_decap.h
index adbec3f03..9ddb8a73b 100644
--- a/hicn-plugin/src/udp_tunnels/udp_decap.h
+++ b/hicn-plugin/src/udp_tunnels/udp_decap.h
@@ -13,4 +13,20 @@
  * limitations under the License.
  */
 
+#ifndef __UDP_DECAP_H__
+#define __UDP_DECAP_H__
+
+/**
+ * @file udp_decap.h
+ *
+ * Implements the udp decapsulation for udp tunnels
+ *
+ * Udp decap nodes follow the ip4/6-local nodes and their purpose
+ * is to retrieve the udp tunnel for the incoming packet. If a tunnel does
+ * not exist the packet is dropped.
+ * The following node to the udp decap nodes are the ip4/6-lookup nodes.
+ */
+
 extern vlib_node_registration_t udp_decap_node;
+
+#endif // __UDP_DECAP_H__
diff --git a/hicn-plugin/src/udp_tunnels/udp_decap_node.c b/hicn-plugin/src/udp_tunnels/udp_decap_node.c
index 6a5831c2b..5603f20f9 100644
--- a/hicn-plugin/src/udp_tunnels/udp_decap_node.c
+++ b/hicn-plugin/src/udp_tunnels/udp_decap_node.c
@@ -19,12 +19,6 @@
 #include "../hicn.h"
 #include "../strategy_dpo_ctx.h"
 
-/**
- * @File
- *
- * Definition of the nodes for ip incomplete faces.
- */
-
 vlib_node_registration_t udp_decap_node;
 
 static char *udp_decap_error_strings[] = {
diff --git a/hicn-plugin/src/udp_tunnels/udp_tunnel.h b/hicn-plugin/src/udp_tunnels/udp_tunnel.h
index 8f38a47e4..2ec92056c 100644
--- a/hicn-plugin/src/udp_tunnels/udp_tunnel.h
+++ b/hicn-plugin/src/udp_tunnels/udp_tunnel.h
@@ -20,6 +20,17 @@
 #include <vppinfra/error.h>
 #include <vnet/udp/udp_encap.h>
 
+/**
+ * @file udp_tunnel.h
+ *
+ * This file implements bidirectional udp tunnels. Udp tunnels exploit
+ * the udp encap functionality in vpp. In particular, a udp tunnel creates
+ * an udp encap object with the information for encapsulating packets and it
+ * implements the udp decap node. The udp decap node checks if a udp tunnel exists
+ * before performing the decapsulation. If the tunnel does not exist the packet
+ * is dropped.
+ */
+
 #define UDP_TUNNEL_INVALID ~0
 
 extern dpo_type_t dpo_type_udp_ip4;
@@ -28,7 +39,19 @@ extern dpo_type_t dpo_type_udp_ip6;
 extern vlib_node_registration_t udp4_decap_node;
 extern vlib_node_registration_t udp6_decap_node;
 
-
+/**
+ * @brief Create a udp tunnel
+ *
+ * @param proto FIB_PROTOCOL_IP4 or FIB_PROTOCOL_IP6
+ * @param fib_index fib index to add to the udp encap
+ * @param src_ip source address of the tunnel
+ * @param dst_ip destination address of the tunnel
+ * @param src_port source port
+ * @param src_port destination port
+ * @param flags flags for the udp encap
+ *
+ * @return return the id of the tunnel
+ */
 u32 udp_tunnel_add (fib_protocol_t proto,
                     index_t fib_index,
                     const ip46_address_t * src_ip,
@@ -37,11 +60,35 @@ u32 udp_tunnel_add (fib_protocol_t proto,
                     u16 dst_port,
                     udp_encap_fixup_flags_t flags);
 
+/**
+ * @brief Retrieve the index of a udp tunnel (same id of the udp encap)
+ *
+ * @param src_ip source address of the tunnel
+ * @param dst_ip destination address of the tunnel
+ * @param src_port source port
+ * @param src_port destination port
+ *
+ * @return id of the udp tunnel/encap
+ */
 u32 udp_tunnel_get(const ip46_address_t * src_ip,
                    const ip46_address_t * dst_ip,
                    u16 src_port,
                    u16 dst_port);
 
+/**
+ * @brief Delete a udp tunnel
+ *
+ * @param proto FIB_PROTOCOL_IP4 or FIB_PROTOCOL_IP6
+ * @param fib_index fib index to add to the udp encap
+ * @param src_ip source address of the tunnel
+ * @param dst_ip destination address of the tunnel
+ * @param src_port source port
+ * @param src_port destination port
+ * @param flags flags for the udp encap
+ *
+ * @return HICN_ERROR_UDP_TUNNEL_NOT_FOUND if the tunnel was not found
+ *         or HICN_ERROR_NONE if the tunnel has been deleted
+ */
 int udp_tunnel_del (fib_protocol_t proto,
                     index_t fib_index,
                     const ip46_address_t * src_ip,
@@ -50,8 +97,18 @@ int udp_tunnel_del (fib_protocol_t proto,
                     u16 dst_port,
                     udp_encap_fixup_flags_t flags);
 
+/**
+ * @brief Add a udp tunnel from an existing udp encap
+ *
+ * @param uei index of the udp encap object
+ * @param proto DPO_PROTO_IP6 or DPO_PROTO_IP4
+ */
 void udp_tunnel_add_existing (index_t uei, dpo_proto_t proto);
 
+/**
+ * @brief Init the udp tunnel module
+ *
+ */
 void udp_tunnel_init();
 
 #endif