Update: folloow up to the update of the code base

src/upf_app/bpf/rules/include/arp_table.h

+#ifndef __ARP_TABLE_H__
+#define __ARP_TABLE_H__
+
+#include <types.h>
+//#include <stdint.h>
+
+struct s_arp_mapping {
+  uint8_t mac_address[6];
+  uint32_t ipv4_address;
+};
+
+#endif  // __ARP_TABLE_H__
\ No newline at end of file

src/upf_app/bpf/rules/include/far_maps.h

+#ifndef __FAR_MAPS_H__
+#define __FAR_MAPS_H__
+
+#include <bpf_helpers.h>
+#include <linux/bpf.h>
+#include <pfcp/pfcp_far.h>
+#include <types.h>
+#include "arp_table.h"
+
+#define ARP_ENTRIES_MAX_SIZE 10000
+#define FAR_TAILS_MAX 20
+#define MAX_INTERFACES 10
+#define MAX_FAR_PROGRAMS 10000
+
+/*---------------------------------------------------------------------------------------------------------------*/
+struct {
+  __uint(type, BPF_MAP_TYPE_DEVMAP);
+  __uint(max_entries, MAX_INTERFACES);
+  __type(key, u32);    // id
+  __type(value, u32);  // tx port
+} m_redirect_interfaces SEC(".maps");
+
+/*---------------------------------------------------------------------------------------------------------------*/
+struct {
+  __uint(type, BPF_MAP_TYPE_HASH);
+  __uint(max_entries, ARP_ENTRIES_MAX_SIZE);
+  __type(key, u32);                     // IPv4 address
+  __type(value, struct s_arp_mapping);  // <IP Address, MAC address>
+} m_arp_table SEC(".maps");
+
+/*---------------------------------------------------------------------------------------------------------------*/
+
+#endif  // __FAR_MAPS_H__