Created UDP PDU. Done some documentation on TCP.

include/tcp.h

@@ -117,7 +117,7 @@ namespace Tins {
         void dport(uint16_t new_dport);
         
         /** \brief Set the source port.
-         * \param new_dport New source port.
+         * \param new_sport New source port.
          */
         void sport(uint16_t new_sport);
         
@@ -151,6 +151,7 @@ namespace Tins {
          * Payload is NOT copied. Therefore, pointers provided as 
          * payloads must be freed manually by the user.
          * \param new_payload New payload.
+         * \param new_payload_size New payload's size
          */
         void payload(uint8_t *new_payload, uint32_t new_payload_size);
         

include/udp.h

@@ -0,0 +1,46 @@
+#ifndef __UDP_H
+#define __UDP_H
+
+
+#include "pdu.h"
+
+namespace Tins {
+
+    /** \brief UDP represents the UDP PDU.
+     * 
+     * UDP is the representation of the UDP PDU. Instances of this class
+     * must be sent over a level 3 PDU, this will otherwise fail.
+     */
+    class UDP : public PDU {
+    public:
+        /** \brief UDP constructor.
+         * 
+         * Creates an instance of UDP. Destination and source port can
+         * be provided, otherwise both will be 0.
+         * \param dport Destination port.
+         * \param sport Source port.
+         * */
+        UDP(uint16_t sport = 0, uint16_t dport = 0);
+        
+        /** \brief Set the payload.
+         * 
+         * Payload is NOT copied. Therefore, pointers provided as 
+         * payloads must be freed manually by the user.
+         * \param new_payload New payload.
+         * \param new_payload_size New payload's size
+         */
+        void payload(uint8_t *new_payload, uint32_t new_payload_size);
+    private:
+        struct udphdr {
+            uint16_t sport;
+            uint16_t dport;
+            uint16_t len;
+            uint16_t check;
+        } __attribute__((packed));
+        
+        udphdr _udp;
+        uint8_t *payload;
+    };
+};
+
+#endif