diff --git a/extend.c b/extend.c
index a1c5ac6..6ccd198 100644
--- a/extend.c
+++ b/extend.c
@@ -23,6 +23,9 @@
 #include "desync.h"
 #include "packets.h"
 
+#define KEY_SIZE sizeof(uint16_t) + \
+    sizeof(sa_family_t) + sizeof(struct sockaddr_in6)
+
 
 int set_timeout(int fd, unsigned int s)
 {
@@ -44,18 +47,9 @@ int set_timeout(int fd, unsigned int s)
     return 0;
 }
 
-struct key_struct {
-    uint16_t port;
-    // to detect correct union in raw
-    sa_family_t family;
-    union {
-        struct in_addr i4;
-        struct in6_addr i6;
-    };
-};
 
-int serialize_key_struct(const struct key_struct* const in, uint8_t* const out, const size_t out_len){
-    
+int serialize_addr(const struct sockaddr_ina *dst, uint8_t* const out, const size_t out_len)
+{
     // Not a function to return on error directly
     #define serialize(raw, field, len, counter){ \
         const size_t size = sizeof(field); \
@@ -64,86 +58,40 @@ int serialize_key_struct(const struct key_struct* const in, uint8_t* const out,
             counter += size; \
         }else return (counter + size); \
     }
-
     // call order is important
     size_t c = 0;
-    serialize(out, in->port, out_len, c);
-    serialize(out, in->family, out_len, c);
+    serialize(out, dst->in.sin_port, out_len, c);
+    serialize(out, dst->sa.sa_family, out_len, c);
     
-    if(in->family == AF_INET){
-        serialize(out, in->i4, out_len, c);
-    }else{
-        serialize(out, in->i6, out_len, c);
+    if (dst->sa.sa_family == AF_INET) {
+        serialize(out, dst->in.sin_addr, out_len, c);
+    } else {
+        serialize(out, dst->in6.sin6_addr, out_len, c);
     }
     #undef serialize
 
-    return 0;
+    return (int )c;
 }
 
-int deserialize_key_struct(const uint8_t* const in, const size_t in_len, struct key_struct* const out){
-    
-    #define deserialize(raw, field, len, counter){ \
-        const size_t size = sizeof(field); \
-        if((counter + size) <= len){ \
-            memcpy(&(field), raw + counter, size); \
-            counter += size; \
-        }else return (counter + size); \
-    }
 
-    // call order is important
-    size_t c = 0;
-    deserialize(in, out->port, in_len, c);
-    deserialize(in, out->family, in_len, c);
-    
-    if(out->family == AF_INET){
-        deserialize(in, out->i4, in_len, c);
-    }else if(out->family == AF_INET6) {
-        deserialize(in, out->i6, in_len, c);
-    }else{
-        // incorrect family
-        return c;
-    }
-    #undef deserialize
-
-    return 0;
-}
 int mode_add_get(struct sockaddr_ina *dst, int m)
 {
     // m < 0: get, m > 0: set, m == 0: delete
     assert(m >= -1 && m < params.dp_count);
     
-    struct key_struct key = {0};
-    
-    key.port = dst->in.sin_port;
-    key.family = dst->sa.sa_family;
-    
-    int len = sizeof(key.port) + sizeof(key.family);
     time_t t = 0;
     struct elem *val = 0;
     
-    if (key.family == AF_INET) {
-        len += sizeof(dst->in.sin_addr);
-        key.i4 = dst->in.sin_addr;
-    }
-    else {
-        len += sizeof(dst->in6.sin6_addr);
-        key.i6 = dst->in6.sin6_addr;
-    }
-
-    // Arrays can't have padding
-    uint8_t key_raw[sizeof(key) + 1] = {0};
-    if(serialize_key_struct(&key, key_raw, sizeof(key_raw))){
+    uint8_t key[KEY_SIZE] = { 0 };
+    int len = serialize_addr(dst, key, sizeof(key));
+    if (len < 0) {
         return -1;
     }
     if (m < 0) {
-        val = mem_get(params.mempool, (char*)key_raw, len);
+        val = mem_get(params.mempool, (char *)key, len);
         if (!val) {
             return -1;
         }
-        /*
-        if(deserialize_key_struct((const uint8_t*) val->data, val->len, &key))
-            return -1;
-        */
         time(&t);
         if (t > val->time + params.cache_ttl) {
             LOG(LOG_S, "time=%jd, now=%jd, ignore\n", (intmax_t)val->time, (intmax_t)t);
@@ -155,14 +103,14 @@ int mode_add_get(struct sockaddr_ina *dst, int m)
 
     if (m == 0) {
         LOG(LOG_S, "delete ip: %s\n", ADDR_STR);
-        mem_delete(params.mempool, (char*)key_raw, len);
+        mem_delete(params.mempool, (char *)key, len);
         return 0;
     }
     else {
         LOG(LOG_S, "save ip: %s, m=%d\n", ADDR_STR, m);
         time(&t);
 
-        val = mem_add(params.mempool, (char*)key_raw, len);
+        val = mem_add(params.mempool, (char *)key, len);
         if (!val) {
             uniperror("mem_add");
             return -1;