Add eviction filter

src/session/session.cpp

@@ -190,9 +190,32 @@ uint64_t session_get_last_time(const struct session *sess)
 }
 
 /******************************************************************************
- * session current packet
+ * session packet
  ******************************************************************************/
 
+const struct packet *session_get0_c2s_1st_pkt(const struct session *sess)
+{
+    return (const struct packet *)session_get0_ex_data(sess, c2s_1st_pkt_ex);
+}
+
+const struct packet *session_get0_s2c_1st_pkt(const struct session *sess)
+{
+    return (const struct packet *)session_get0_ex_data(sess, s2c_1st_pkt_ex);
+}
+
+const struct packet *session_get0_1st_pkt(const struct session *sess)
+{
+    const struct packet *c2s_1st_pkt = session_get0_c2s_1st_pkt(sess);
+    if (c2s_1st_pkt)
+    {
+        return c2s_1st_pkt;
+    }
+    else
+    {
+        return session_get0_s2c_1st_pkt(sess);
+    }
+}
+
 // session current packet
 void session_set0_cur_pkt(struct session *sess, const struct packet *pkt)
 {