nuttx/net/ieee802154/ieee802154.h

/****************************************************************************
 * net/ieee802154/ieee802154.h
 *
 *   Copyright (C) 2017, 2019 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <gnutt@nuttx.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 ****************************************************************************/

#ifndef _NET_IEEE802154_IEEE802154_H
#define _NET_IEEE802154_IEEE802154_H

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <nuttx/config.h>

#include <sys/types.h>
#include <queue.h>
#include <netpacket/ieee802154.h>

#ifdef CONFIG_NET_IEEE802154

/****************************************************************************
 * Pre-processor Definitions
 ****************************************************************************/

/* Allocate a new IEEE 802.15.4 socket data callback */

#define ieee802154_callback_alloc(dev,conn) \
  devif_callback_alloc(dev, &conn->list)
#define ieee802154_callback_free(dev,conn,cb) \
  devif_conn_callback_free(dev, cb, &conn->list)

/* Memory Pools */

#define IEEE802154_POOL_PREALLOCATED  0
#define IEEE802154_POOL_DYNAMIC       1

/* Frame size */

/* This maximum size of an IEEE 802.15.4 frame.  Certain, non-standard
 * devices may exceed this value, however.
 */

#define IEEE802154_MAC_STDFRAME 127

/* Space for a two byte FCS must be reserved at the end of the frame */

#define IEEE802154_MAC_FCSSIZE  2

/* This, then, is the usable size of the frame... */

#if defined(CONFIG_NET_IEEE802154_FRAMELEN)
#  define IEEE802_MAX_FRAMELEN CONFIG_NET_IEEE802154_FRAMELEN
#else
#  define IEEE802_MAX_FRAMELEN IEEE802154_MAC_STDFRAME
#endif

#define IEEE802154_FRAMELEN (IEEE802_MAX_FRAMELEN - IEEE802154_MAC_FCSSIZE)

/****************************************************************************
 * Public Type Definitions
 ****************************************************************************/

/* Used for containing and queuing IOBs along with information about the
 * source of the frame.
 */

struct iob_s;  /* Forward reference */

struct ieee802154_container_s
{
  FAR struct ieee802154_container_s *ic_flink; /* Supports a singly linked list */
  struct ieee802154_saddr_s ic_src;            /* Source of the packet */
  FAR struct iob_s *ic_iob;                    /* Contained IOB */
  uint8_t ic_pool;                             /* See IEEE802154_POOL_* definitions */
};

/* Representation of a IEEE 802.15.4 socket connection */

struct devif_callback_s;                       /* Forward reference */

struct ieee802154_conn_s
{
  /* Common prologue of all connection structures. */

  dq_entry_t node;                             /* Supports a double linked list */

  /* This is a list of IEEE 802.15.4 callbacks.  Each callback represents
   * a thread that is stalled, waiting for a device-specific event.
   */

  FAR struct devif_callback_s *list;

  /* IEEE 802.15.4-specific content follows */

  struct ieee802154_saddr_s laddr;             /* Locally bound / source address */
  struct ieee802154_saddr_s raddr;             /* Connected remote address */
  uint8_t crefs;                               /* Reference counts on this instance */
#if CONFIG_NET_IEEE802154_BACKLOG > 0
  uint8_t backlog;                             /* Number of frames in RX queue */
#endif

  /* Queue of incoming packets */

  FAR struct ieee802154_container_s *rxhead;
  FAR struct ieee802154_container_s *rxtail;
};

/****************************************************************************
 * Public Data
 ****************************************************************************/

#ifdef __cplusplus
#  define EXTERN extern "C"
extern "C"
{
#else
#  define EXTERN extern
#endif

/* The IEEE 802.15.4 socket interface */

EXTERN const struct sock_intf_s g_ieee802154_sockif;

/****************************************************************************
 * Public Function Prototypes
 ****************************************************************************/

struct ieee802154_data_ind_s; /* Forward reference */
struct radio_driver_s;        /* Forward reference */
struct net_driver_s;          /* Forward reference */
struct socket;                /* Forward reference */
struct sockaddr;              /* Forward reference */

/****************************************************************************
 * Name: ieee802154_initialize()
 *
 * Description:
 *   Initialize the IEEE 802.15.4 socket support.  Called once and only
 *   from the network initialization logic.
 *
 * Assumptions:
 *   Called early in the initialization sequence
 *
 ****************************************************************************/

void ieee802154_initialize(void);

/****************************************************************************
 * Name: ieee802154_conn_initialize
 *
 * Description:
 *   Initialize the IEEE 802.15.4 connection structure allocator.  Called
 *   once and only from ieee802154_initialize().
 *
 * Assumptions:
 *   Called early in the initialization sequence
 *
 ****************************************************************************/

void ieee802154_conn_initialize(void);

/****************************************************************************
 * Name: ieee802154_conn_alloc()
 *
 * Description:
 *   Allocate a new, uninitialized IEEE 802.15.4 socket connection
 *   structure. This is normally something done by the implementation of
 *   the socket() API
 *
 ****************************************************************************/

FAR struct ieee802154_conn_s *ieee802154_conn_alloc(void);

/****************************************************************************
 * Name: ieee802154_conn_free()
 *
 * Description:
 *   Free a IEEE 802.15.4 socket connection structure that is no longer in
 *   use.  This should be done by the implementation of close().
 *
 ****************************************************************************/

void ieee802154_conn_free(FAR struct ieee802154_conn_s *conn);

/****************************************************************************
 * Name: ieee802154_conn_active()
 *
 * Description:
 *   Find a connection structure that is the appropriate
 *   connection to be used with the provided Ethernet header
 *
 * Assumptions:
 *   This function is called from network logic at with the network locked.
 *
 ****************************************************************************/

FAR struct ieee802154_conn_s *
  ieee802154_conn_active(FAR const struct ieee802154_data_ind_s *meta);

/****************************************************************************
 * Name: ieee802154_conn_next()
 *
 * Description:
 *   Traverse the list of allocated IEEE 802.15.4 connections
 *
 * Assumptions:
 *   This function is called from network logic at with the network locked.
 *
 ****************************************************************************/

FAR struct ieee802154_conn_s *
  ieee802154_conn_next(FAR struct ieee802154_conn_s *conn);

/****************************************************************************
 * Name: ieee802154_input
 *
 * Description:
 *   Handle incoming IEEE 802.15.4 input
 *
 *   This function is called when the radio device driver has received an
 *   frame from the network.  The frame from the device driver must be
 *   provided in by the IOB frame argument of the  function call:
 *
 *   - The frame data is in the IOB io_data[] buffer,
 *   - The length of the frame is in the IOB io_len field, and
 *   - The offset past and radio MAC header is provided in the io_offset
 *     field.
 *
 *   The frame argument may refer to a single frame (a list of length one)
 *   or may it be the head of a list of multiple frames.
 *
 *   - The io_flink field points to the next frame in the list (if enable)
 *   - The last frame in the list will have io_flink == NULL.
 *
 * Input Parameters:
 *   radio       The radio network driver interface.
 *   framelist - The head of an incoming list of frames.  Normally this
 *               would be a single frame.  A list may be provided if
 *               appropriate, however.
 *   meta      - Meta data characterizing the received frame.
 *
 *               If there are multilple frames in the list, this metadata
 *               must apply to all of the frames in the list.
 *
 * Returned Value:
 *   OK    The IEEE 802.15.4 has been processed  and can be deleted
 *   ERROR Hold the IEEE 802.15.4 and try again later. There is a listening
 *         socket but no recv in place to catch the IEEE 802.15.4 yet.
 *         Useful when a packet arrives before a recv call is in place.
 *
 * Assumptions:
 *   Called from the network diver with the network locked.
 *
 ****************************************************************************/

/* ieee802154_input() is prototyped in include/nuttx/net/ieee802154.h */

/****************************************************************************
 * Name: ieee802154_callback
 *
 * Description:
 *   Inform the application holding the IEEE 802.15.4 socket of a change in state.
 *
 * Returned Value:
 *   OK if IEEE 802.15.4 has been processed, otherwise ERROR.
 *
 * Assumptions:
 *   This function is called from network logic at with the network locked.
 *
 ****************************************************************************/

uint16_t ieee802154_callback(FAR struct radio_driver_s *radio,
                             FAR struct ieee802154_conn_s *conn,
                             uint16_t flags);

/****************************************************************************
 * Name: ieee802154_recvfrom
 *
 * Description:
 *   Implements the socket recvfrom interface for the case of the AF_INET
 *   and AF_INET6 address families.  ieee802154_recvfrom() receives messages from
 *   a socket, and may be used to receive data on a socket whether or not it
 *   is connection-oriented.
 *
 *   If 'from' is not NULL, and the underlying protocol provides the source
 *   address, this source address is filled in.  The argument 'fromlen' is
 *   initialized to the size of the buffer associated with from, and
 *   modified on return to indicate the actual size of the address stored
 *   there.
 *
 * Input Parameters:
 *   psock    A pointer to a NuttX-specific, internal socket structure
 *   buf      Buffer to receive data
 *   len      Length of buffer
 *   flags    Receive flags
 *   from     Address of source (may be NULL)
 *   fromlen  The length of the address structure
 *
 * Returned Value:
 *   On success, returns the number of characters received.  If no data is
 *   available to be received and the peer has performed an orderly shutdown,
 *   recv() will return 0.  Otherwise, on errors, a negated errno value is
 *   returned (see recvfrom() for the list of appropriate error values).
 *
 ****************************************************************************/

ssize_t ieee802154_recvfrom(FAR struct socket *psock, FAR void *buf,
                            size_t len, int flags, FAR struct sockaddr *from,
                            FAR socklen_t *fromlen);

/****************************************************************************
 * Name: ieee802154_find_device
 *
 * Description:
 *   Select the network driver to use with the IEEE802154 transaction.
 *
 * Input Parameters:
 *   conn - IEEE802154 connection structure (not currently used).
 *   addr - The address to match the devices assigned address
 *
 * Returned Value:
 *   A pointer to the network driver to use.  NULL is returned on any
 *   failure.
 *
 ****************************************************************************/

FAR struct radio_driver_s *
  ieee802154_find_device(FAR struct ieee802154_conn_s *conn,
                         FAR const struct ieee802154_saddr_s *addr);

/****************************************************************************
 * Name: ieee802154_poll
 *
 * Description:
 *   Poll a IEEE 802.15.4 "connection" structure for availability of TX data
 *
 * Input Parameters:
 *   dev - The device driver structure to use in the send operation
 *   conn - The IEEE 802.15.4 "connection" to poll for TX data
 *
 * Returned Value:
 *   None
 *
 * Assumptions:
 *   Called from the network device interface (devif) with the network
 *   locked.
 *
 ****************************************************************************/

void ieee802154_poll(FAR struct net_driver_s *dev,
                     FAR struct ieee802154_conn_s *conn);

/****************************************************************************
 * Name: psock_ieee802154_sendto
 *
 * Description:
 *   If sendto() is used on a connection-mode (SOCK_STREAM, SOCK_SEQPACKET)
 *   socket, the parameters to and 'tolen' are ignored (and the error EISCONN
 *   may be returned when they are not NULL and 0), and the error ENOTCONN is
 *   returned when the socket was not actually connected.
 *
 * Input Parameters:
 *   psock    A pointer to a NuttX-specific, internal socket structure
 *   buf      Data to send
 *   len      Length of data to send
 *   flags    Send flags
 *   to       Address of recipient
 *   tolen    The length of the address structure
 *
 * Returned Value:
 *   On success, returns the number of characters sent.  On  error,
 *   a negated errno value is retruend.  See sendto() for the complete list
 *   of return values.
 *
 ****************************************************************************/

ssize_t psock_ieee802154_sendto(FAR struct socket *psock,
                                FAR const void *buf,
                                size_t len, int flags,
                                FAR const struct sockaddr *to, socklen_t tolen);

/****************************************************************************
 * Name: ieee802154_container_initialize
 *
 * Description:
 *   This function initializes the container allocator.  This function must
 *   be called early in the initialization sequence before any socket
 *   activity.
 *
 * Input Parameters:
 *   None
 *
 * Returned Value:
 *   None
 *
 * Assumptions:
 *   Called early in the initialization sequence
 *
 ****************************************************************************/

void ieee802154_container_initialize(void);

/****************************************************************************
 * Name: ieee802154_container_allocate
 *
 * Description:
 *   The ieee802154_container_allocate function will get a free container
 *   for use by the recvfrom() logic.
 *
 *   This function will first attempt to allocate from the g_free_container
 *   list.  If that the list is empty, then the meta-data structure will be
 *   allocated from the dynamic memory pool.
 *
 * Input Parameters:
 *   None
 *
 * Returned Value:
 *   A reference to the allocated container structure.  All user fields in this
 *   structure have been zeroed.  On a failure to allocate, NULL is
 *   returned.
 *
 * Assumptions:
 *   The caller has locked the network.
 *
 ****************************************************************************/

FAR struct ieee802154_container_s *ieee802154_container_allocate(void);

/****************************************************************************
 * Name: ieee802154_container_free
 *
 * Description:
 *   The ieee802154_container_free function will return a container structure
 *   to the free list of containers if it was a pre-allocated container
 *   structure. If the container structure was allocated dynamically it will
 *   be deallocated.
 *
 * Input Parameters:
 *   container - container structure to free
 *
 * Returned Value:
 *   None
 *
 * Assumptions:
 *   The caller has locked the network.
 *
 ****************************************************************************/

void ieee802154_container_free(FAR struct ieee802154_container_s *container);

#undef EXTERN
#ifdef __cplusplus
}
#endif

#endif /* CONFIG_NET_IEEE802154 */
#endif /* _NET_IEEE802154_IEEE802154_H */