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  /*
   * Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
   *
   * This file is subject to the terms and conditions of the GNU Lesser
   * General Public License v2.1. See the file LICENSE in the top level
   * directory for more details.
   */
  
  /**
   * @defgroup    net_gnrc_sixlowpan    6LoWPAN
   * @ingroup     net_gnrc
   * @brief       GNRC's 6LoWPAN implementation
   *
   * This module is for usage with the @ref net_gnrc_netapi.
   *
   * # NETAPI command documentation
   *
   * ## `GNRC_NETAPI_MSG_TYPE_RCV`
   *
   * @ref GNRC_NETAPI_MSG_TYPE_RCV expects a @ref net_gnrc_pkt (referred to as "packet" in the
   * following) in receive order (link-layer payload first, @ref net_gnrc_netif_hdr last) with the
   * payload marked with @ref GNRC_NETTYPE_SIXLOWPAN. Every other packet will be silently discarded.
   *
   * If the first byte of the payload is @ref SIXLOWPAN_UNCOMP this byte will be removed by marking
   * it with a new @ref gnrc_pktsnip_t and then removing this @ref gnrc_pktsnip_t, the remaining
   * payload will be marked with @ref GNRC_NETTYPE_IPV6 and this module will issue a
   * @ref GNRC_NETAPI_MSG_TYPE_RCV to all subscribers registered to @ref GNRC_NETTYPE_IPV6 with
   * demultiplex context @ref GNRC_NETREG_DEMUX_CTX_ALL in the @ref net_gnrc_netreg with the packet.
   * Otherwise, the packet will be silently discarded (except for the cases documented below).
   *
   * Depending on which other modules are included the behavior can be a little different:
   *
   *  1.  If @ref net_gnrc_sixlowpan_frag is included and @ref sixlowpan_frag_is() is true for the
   *      packet, the fragmentation header will be removed and its remaining data will be added to
   *      the reassembly buffer (using @ref rbuf_add()) in accordance to the fragmentation header.
   *      The packet containing the fragment will be discarded. When the fragmented datagram is
   *      complete, its payload will be marked with @ref GNRC_NETTYPE_IPV6 and issued via a
   *      @ref GNRC_NETAPI_MSG_TYPE_RCV to all subscribers registered to @ref GNRC_NETTYPE_IPV6 with
   *      demultiplex context @ref GNRC_NETREG_DEMUX_CTX_ALL in the @ref net_gnrc_netreg. If
   *      reassembly times out or if fragments overlap the datagram will be silently discarded.
   *  2.  If @ref net_gnrc_sixlowpan_iphc is included the packet will not be send to the subscribers
   *      to @ref GNRC_NETTYPE_IPV6 with demultiplex context @ref GNRC_NETREG_DEMUX_CTX_ALL
   *      immediately, but it will be checked first if @ref sixlowpan_iphc_is() is true for its
   *      payload. If false it will be send to the @ref GNRC_NETTYPE_IPV6 subscribers as usual. If
   *      true the IPHC dispatch will be decompressed to a full IPv6 header first. The IPv6 header
   *      will be included as a new @ref gnrc_pktsnip_t to the packet directly behind the payload.
   *      The IPHC dispatch will be removed. The resulting packet will then be issued to the
   *      @ref GNRC_NETTYPE_IPV6 subscribers as usual.
   *  3.  If both @ref net_gnrc_sixlowpan_frag and @ref net_gnrc_sixlowpan_iphc are included the
   *      and @ref sixlowpan_frag_is() is true for the packet, the fragmented datagram will be
   *      reassembled as described in (1). If for the remainder (after removal of the fragment
   *      header) of the first fragment @ref sixlowpan_iphc_is() is true, it will be decompressed as
   *      described in (2), with the exception that the packet will only be send to all receivers of
   *      @ref GNRC_NETTYPE_IPV6 as soon as the datagram was completely reassembled and not after
   *      directly after decompression. If @ref sixlowpan_iphc_is() is false, reassembly is handled
   *      completely as described in (1). It is assumed that a fragment can fit a full compression
   *      header (including inlined fields and possibly NHC/GHC headers) as specified in
   *      <a href="https://tools.ietf.org/html/rfc6282#section-2">RFC 6282, section 2</a>.
   *
   * ## `GNRC_NETAPI_MSG_TYPE_SND`
   *
   * @ref GNRC_NETAPI_MSG_TYPE_SND expects a @ref net_gnrc_pkt (referred to as "packet" in the
   * following) in send order (headers first, payload last) with the first header being a valid
   * @ref GNRC_NETTYPE_NETIF header and the second a @ref GNRC_NETTYPE_IPV6 header. Every other
   * packet will be silently discarded.
   *
   * The @ref GNRC_NETTYPE_SIXLOWPAN header must at least have the gnrc_netif_hdr_t::if_pid field
   * set to a legal, 6LoWPAN compatible interface (a @ref gnrc_sixlowpan_netif_t entry referred to as
   * `iface` in the following must exist) referred to as "the interface thread" in the following,
   * otherwise the packet will be discarded.
   *
   * If @ref net_gnrc_sixlowpan_iphc is included and gnrc_sixlowpan_netif_t::iphc_enable of `iface`
   * is true the @ref GNRC_NETTYPE_IPV6 header will be compressed according to
   * <a href="https://tools.ietf.org/html/rfc6282">RFC 6282</a>. If it is false the
   * @ref SIXLOWPAN_UNCOMP dispatch will be appended as a new @ref gnrc_pktsnip_t to the packet.
   * The false case also applies if @ref net_gnrc_sixlowpan_iphc is not included.
   *
   * If the packet without @ref GNRC_NETTYPE_NETIF header is shorter than
   * gnrc_sixlowpan_netif_t::max_frag_size of `iface` the packet will be send to the interface
   * thread. Otherwise if @ref net_gnrc_sixlowpan_frag is included the packet will be fragmented
   * according to <a href="https://tools.ietf.org/html/rfc4944">RFC 4944</a> if the packet is without
   * @ref GNRC_NETTYPE_NETIF header shorter than @ref SIXLOWPAN_FRAG_MAX_LEN. If none of these cases
   * apply, the packet will be discarded silently.
   *
   * ## `GNRC_NETAPI_MSG_TYPE_SET`
   *
   * `GNRC_NETAPI_MSG_TYPE_SET` is not supported.
   *
   * ## `GNRC_NETAPI_MSG_TYPE_GET`
   *
   * `GNRC_NETAPI_MSG_TYPE_GET` is not supported.
   *
   * @{
   *
   * @file
   * @brief   Definitions for 6LoWPAN
   *
   * @author  Martine Lenders <mlenders@inf.fu-berlin.de>
   */
  #ifndef GNRC_SIXLOWPAN_H_
  #define GNRC_SIXLOWPAN_H_
  
  #include <stdbool.h>
  
  #include "kernel_types.h"
  
  #include "net/gnrc/sixlowpan/frag.h"
  #include "net/gnrc/sixlowpan/iphc.h"
  #include "net/sixlowpan.h"
  
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  /**
   * @brief   Default stack size to use for the 6LoWPAN thread.
   */
  #ifndef GNRC_SIXLOWPAN_STACK_SIZE
  #define GNRC_SIXLOWPAN_STACK_SIZE       (THREAD_STACKSIZE_DEFAULT)
  #endif
  
  /**
   * @brief   Default priority for the 6LoWPAN thread.
   */
  #ifndef GNRC_SIXLOWPAN_PRIO
  #define GNRC_SIXLOWPAN_PRIO             (THREAD_PRIORITY_MAIN - 4)
  #endif
  
  /**
   * @brief   Default message queue size to use for the 6LoWPAN thread.
   */
  #ifndef GNRC_SIXLOWPAN_MSG_QUEUE_SIZE
  #define GNRC_SIXLOWPAN_MSG_QUEUE_SIZE   (8U)
  #endif
  
  /**
   * @brief   Initialization of the 6LoWPAN thread.
   *
   * @details If 6LoWPAN was already initialized, it will just return the PID of
   *          the 6LoWPAN thread.
   *
   * @return  The PID to the 6LoWPAN thread, on success.
   * @return  -EINVAL, if @ref GNRC_SIXLOWPAN_PRIO was greater than or equal to
   *          @ref SCHED_PRIO_LEVELS
   * @return  -EOVERFLOW, if there are too many threads running already in general
   */
  kernel_pid_t gnrc_sixlowpan_init(void);
  
  #ifdef __cplusplus
  }
  #endif
  
  #endif /* GNRC_SIXLOWPAN_H_ */
  /** @} */