update session finite state machine & add tcp init -> opening test case

src/packet/ipv4_helpers.h

@@ -124,6 +124,11 @@ static inline const uint8_t *ipv4_hdr_get_opt_ptr(const struct ip *hdr)
     return (const uint8_t *)hdr + sizeof(struct ip);
 }
 
+static inline void ipv4_hdr_set_ipid(struct ip *hdr, uint16_t ipid)
+{
+    hdr->ip_id = htons(ipid);
+}
+
 #ifdef __cpluscplus
 }
 #endif

src/packet/packet_helpers.h

@@ -16,6 +16,7 @@ extern "C"
 
 struct metadata
 {
+    char data[64];
     // TODO
 };
 
@@ -120,6 +121,7 @@ static inline struct packet *packet_dup(const struct packet *pkt)
             pkt_dup->layers[i].pld_ptr = pkt_dup->data_ptr + pkt->layers[i].hdr_offset + pkt->layers[i].hdr_len;
         }
     }
+    packet_set0_metadata(pkt_dup, metadata_dup(packet_get0_metadata(pkt)));
 
     return pkt_dup;
 }
@@ -128,6 +130,9 @@ static inline void packet_free(struct packet *pkt)
 {
     if (pkt)
     {
+        metadata_free((struct metadata *)packet_get0_metadata(pkt));
+        packet_set0_metadata(pkt, NULL);
+
         if (pkt->data_ptr)
         {
             free((char *)pkt->data_ptr);