diff -Nur lwip-org/src/core/tcp.c lwip-gz-addr/src/core/tcp.c
--- lwip-org/src/core/tcp.c	2023-12-04 14:10:25.364481010 +0800
+++ lwip-gz-addr/src/core/tcp.c	2023-12-04 14:33:31.712481010 +0800
@@ -1161,7 +1161,7 @@
 
       if (__atomic_load_n(&port_state[tcp_port - TCP_LOCAL_PORT_RANGE_START], __ATOMIC_ACQUIRE) == 0) {
 #if GAZELLE_ENABLE
-        if (port_in_stack_queue(pcb->remote_ip, pcb->local_ip, pcb->remote_port, tcp_port)) {
+        if (port_in_stack_queue((gz_addr_t *)&pcb->remote_ip, (gz_addr_t *)&pcb->local_ip, pcb->remote_port, tcp_port)) {
             tmp_port = tcp_port;
             __atomic_store_n(&port_state[tcp_port - TCP_LOCAL_PORT_RANGE_START], 1, __ATOMIC_RELEASE);
             break;
diff -Nur lwip-org/src/core/udp.c lwip-gz-addr/src/core/udp.c
--- lwip-org/src/core/udp.c	2023-12-04 14:10:25.364481010 +0800
+++ lwip-gz-addr/src/core/udp.c	2023-12-04 14:19:58.832481010 +0800
@@ -132,7 +132,7 @@
     }
 
     if (__atomic_load_n(&port_state[udp_port - UDP_LOCAL_PORT_RANGE_START], __ATOMIC_ACQUIRE) == 0) {
-      if (port_in_stack_queue(dst_pcb->remote_ip, dst_pcb->local_ip, dst_pcb->remote_port, udp_port)) {
+      if (port_in_stack_queue((gz_addr_t *)&dst_pcb->remote_ip, (gz_addr_t *)&dst_pcb->local_ip, dst_pcb->remote_port, udp_port)) {
           tmp_port = udp_port;
           __atomic_store_n(&port_state[udp_port - UDP_LOCAL_PORT_RANGE_START], 1, __ATOMIC_RELEASE);
           break;
diff -Nur lwip-org/src/include/lwipopts.h lwip-gz-addr/src/include/lwipopts.h
--- lwip-org/src/include/lwipopts.h	2023-12-04 14:10:25.368481010 +0800
+++ lwip-gz-addr/src/include/lwipopts.h	2023-12-06 19:29:24.520481010 +0800
@@ -184,6 +184,7 @@
 */
 #define LWIP_IPV6                1
 #define IP6_HLEN                 40
+#define LWIP_IPV6_SCOPES         1
 
 /*
    ---------------------------------
diff -Nur lwip-org/src/include/reg_sock.h lwip-gz-addr/src/include/reg_sock.h
--- lwip-org/src/include/reg_sock.h	2023-12-04 14:10:25.368481010 +0800
+++ lwip-gz-addr/src/include/reg_sock.h	2023-12-06 19:41:19.792481010 +0800
@@ -34,7 +34,35 @@
 #define __REG_SOCK_H__
 
 #include <stdbool.h>
-#include "lwip/ip_addr.h"
+
+#include "lwipopts.h"
+
+/*  compatible with ip4_addr_t */
+struct gz_ip4 {
+  uint32_t addr;
+};
+
+/*  compatible with ip6_addr_t */
+#if LWIP_IPV6
+struct gz_ip6 {
+  uint32_t addr[4];
+#if LWIP_IPV6_SCOPES
+  uint8_t zone;
+#endif /* LWIP_IPV6_SCOPES */
+};
+#endif /* LWIP_IPV6 */
+
+/* gazelle ip address, compatible with ip_addr_t */
+typedef struct gz_addr {
+    union {
+#if LWIP_IPV6
+        struct gz_ip6 ip6;
+#endif /* LWIP_IPV6 */
+        struct gz_ip4 ip4;
+    } u_addr;
+    /** @ref lwip_ip_addr_type */
+    uint8_t type;
+} gz_addr_t;
 
 enum reg_ring_type {
     REG_RING_TCP_LISTEN = 0,
@@ -45,10 +73,12 @@
 };
 
 struct gazelle_quintuple {
-	uint32_t protocol;
+    uint32_t protocol;
     /* net byte order */
     uint16_t src_port;
     uint16_t dst_port;
+
+    /* TODO: replace with gz_addr_t */
     uint32_t src_ip;
     uint32_t dst_ip;
 #if LWIP_IPV6
@@ -65,6 +95,6 @@
 };
 
 extern int vdev_reg_xmit(enum reg_ring_type type, struct gazelle_quintuple *qtuple);
-extern bool port_in_stack_queue(ip_addr_t src_ip, ip_addr_t dst_ip, uint16_t src_port, uint16_t dst_port);
+extern bool port_in_stack_queue(gz_addr_t *src_ip, gz_addr_t *dst_ip, uint16_t src_port, uint16_t dst_port);
 
 #endif /* __REG_SOCK_H__ */