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  1. /*
  2.  * Copyright (c) 2009 Lukas Mejdrech
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /** @addtogroup packet
  30.  *  @{
  31.  */
  32.  
  33. /** @file
  34.  *  Packet map and queue.
  35.  */
  36.  
  37. #ifndef __NET_PACKET_H__
  38. #define __NET_PACKET_H__
  39.  
  40. /** Packet identifier type.
  41.  *  Value zero (0) is used as an invalid identifier.
  42.  */
  43. typedef int packet_id_t;
  44.  
  45. /** Type definition of the packet.
  46.  *  @see packet
  47.  */
  48. typedef struct packet * packet_t;
  49.  
  50. /** Type definition of the packet pointer.
  51.  *  @see packet
  52.  */
  53. typedef packet_t *      packet_ref;
  54.  
  55. /** Type of the received packet.
  56.  */
  57. enum packet_type{
  58.     /** The packet is from the local subsystem.
  59.      */
  60.     PACKET_SELF,
  61.     /** The packet is for all hosts.
  62.      */
  63.     PACKET_BROADCAST,
  64.     /** The packet target complies with the local subsystem filter.
  65.      */
  66.     PACKET_MULTICAST,
  67.     /** The packet is for the local subsystem from other host.
  68.      */
  69.     PACKET_OTHERHOST
  70. };
  71.  
  72. /** @name Packet management system interface
  73.  */
  74. /*@{*/
  75.  
  76. /** Finds the packet mapping.
  77.  *  @param packet_id The packet identifier to be found. Input parameter.
  78.  *  @returns The found packet reference.
  79.  *  @returns NULL if the mapping does not exist.
  80.  */
  81. packet_t    pm_find( packet_id_t packet_id );
  82.  
  83. /** Adds the packet mapping.
  84.  *  @param packet The packet to be remembered. Input parameter.
  85.  *  @returns EOK on success.
  86.  *  @returns EINVAL if the packet is not valid.
  87.  *  @returns EINVAL if the packet map is not initialized.
  88.  *  @returns ENOMEM if there is not enough memory left.
  89.  */
  90. int pm_add( packet_t packet );
  91.  
  92. /** Initializes the packet map.
  93.  *  @returns EOK on success.
  94.  *  @returns ENOMEM if there is not enough memory left.
  95.  */
  96. int pm_init( void );
  97.  
  98. /** Releases the packet map.
  99.  */
  100. void    pm_destroy( void );
  101.  
  102. /** Add packet to the sorted queue.
  103.  *  The queue is sorted in the ascending order.
  104.  *  The packet is inserted right before the packets of the same order value.
  105.  *  @param first The first packet of the queue. May be NULL. Input parameter.
  106.  *  @param packet The packet to be added. Input parameter.
  107.  *  @param order The packet order value. Input parameter.
  108.  *  @param metric The metric value of the packet. Input parameter.
  109.  *  @returns The first packet of the queue. The original first packet may be shifted by the new packet.
  110.  *  @returns NULL if the packet is not valid.
  111.  */
  112. packet_t    pq_add( packet_t first, packet_t packet, int order, size_t metric );
  113.  
  114. /** Inserts packet after the given one.
  115.  *  @param packet The packet in the queue. Input parameter.
  116.  *  @param new_packet The new packet to be inserted.
  117.  *  @returns EOK on success.
  118.  *  @returns EINVAL if etiher of the packets is invalid.
  119.  */
  120. int pq_insert_after( packet_t packet, packet_t new_packet );
  121.  
  122. /** Detach the packet from the queue.
  123.  *  @param packet The packet to be detached. Input parameter.
  124.  *  @returns The next packet in the queue. If the packet is the first one of the queue, this becomes the new first one.
  125.  *  @returns NULL if there is no packet left.
  126.  *  @returns NULL if the packet is not valid.
  127.  */
  128. packet_t    pq_detach( packet_t packet );
  129.  
  130. /** Sets the packet order and metric attributes.
  131.  *  @param packet The packet to be set. Input parameter.
  132.  *  @param order The packet order value. Input parameter.
  133.  *  @param metric The metric value of the packet. Input parameter.
  134.  */
  135. int pq_set( packet_t packet, int order, size_t metric );
  136.  
  137. /** Releases the whole queue.
  138.  *  Detaches all packets of the queue and calls the packet_release() for each of them.
  139.  *  @param first The first packet of the queue. Input parameter.
  140.  *  @param packet_release The releasing function called for each of the packets after its detachment. Input parameter.
  141.  */
  142. void    pq_destroy( packet_t first, void ( * packet_release )( packet_t packet ));
  143.  
  144. /** Returns the next packet in the queue.
  145.  *  @param packet The packet queue member. Input parameter.
  146.  *  @returns The next packet in the queue.
  147.  *  @returns NULL if there is no next packet.
  148.  *  @returns NULL if the packet is not valid.
  149.  */
  150. packet_t    pq_next( packet_t packet );
  151.  
  152. /** Returns the previous packet in the queue.
  153.  *  @param packet The packet queue member. Input parameter.
  154.  *  @returns The previous packet in the queue.
  155.  *  @returns NULL if there is no previous packet.
  156.  *  @returns NULL if the packet is not valid.
  157.  */
  158. packet_t    pq_previous( packet_t packet );
  159.  
  160. /*@}*/
  161.  
  162. #endif
  163.  
  164. /** @}
  165.  */
  166.