/****************************************************************************
 * net/sixlowpan/sixlowpan.h
 *
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.  The
 * ASF licenses this file to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance with the
 * License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
 * License for the specific language governing permissions and limitations
 * under the License.
 *
 ****************************************************************************/

#ifndef __NET_SIXLOWPAN_SIXLOWPAN_H
#define __NET_SIXLOWPAN_SIXLOWPAN_H

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

#include <nuttx/config.h>
#include <sys/types.h>

#ifdef CONFIG_NET_6LOWPAN

/****************************************************************************
 * Public Types
 ****************************************************************************/

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

struct net_driver_s; /* Forward reference */
struct ipv6_hdr_s;   /* Forward reference */
struct socket;       /* Forward reference */
struct sockaddr;     /* Forward reference */

/****************************************************************************
 * Name: sixlowpan_initialize
 *
 * Description:
 *   sixlowpan_initialize() is called during OS initialization at power-up
 *   reset.  It is called from the common net_setup() function.
 *   sixlowpan_initialize() configures 6LoWPAN networking data structures.
 *   It is called prior to platform-specific driver initialization so that
 *   the 6LoWPAN networking subsystem is prepared to deal with network
 *   driver initialization actions.
 *
 * Input Parameters:
 *   None
 *
 * Returned Value:
 *   None
 *
 ****************************************************************************/

void sixlowpan_initialize(void);

/****************************************************************************
 * Name: psock_6lowpan_tcp_send
 *
 * Description:
 *   psock_6lowpan_tcp_send() call may be used only when the TCP socket is in
 *   a connected state (so that the intended recipient is known).
 *
 * Input Parameters:
 *   psock - An instance of the internal socket structure.
 *   buf   - Data to send
 *   len   - Length of data to send
 *
 * Returned Value:
 *   On success, returns the number of characters sent.  On  error,
 *   -1 is returned, and errno is set appropriately.  Returned error numbers
 *   must be consistent with definition of errors reported by send() or
 *   sendto().
 *
 * Assumptions:
 *   Called with the network locked.
 *
 ****************************************************************************/

#ifdef CONFIG_NET_TCP
ssize_t psock_6lowpan_tcp_send(FAR struct socket *psock, FAR const void *buf,
                               size_t len);
#endif

/****************************************************************************
 * Name: sixlowpan_tcp_send
 *
 * Description:
 *   TCP output comes through three different mechansims.  Either from:
 *
 *   1. TCP socket output.  For the case of TCP output to an
 *      IEEE802.15.4, the TCP output is caught in the socket
 *      send()/sendto() logic and and redirected to psock_6lowpan_tcp_send().
 *   2. TCP output from the TCP state machine.  That will occur
 *      during TCP packet processing by the TCP state meachine.
 *   3. TCP output resulting from TX or timer polling
 *
 *   Cases 2 and 3 will be handled here.  Logic in ipv6_tcp_input(),
 *   and devif_poll() detect if (1) an attempt to return with
 *   d_len > 0 and (2) that the device is an IEEE802.15.4 MAC network
 *   driver. Under those conditions, this function will be called to create
 *   the IEEE80215.4 frames.
 *
 * Input Parameters:
 *   dev    - The network device containing the packet to be sent.
 *   fwddev - The network device used to send the data.  This will be the
 *            same device except for the IP forwarding case where packets
 *            are sent across devices.
 *   ipv6   - A pointer to the IPv6 header in dev->d_buf which lies AFTER
 *            the L1 header.  NOTE: dev->d_len must have been decremented
 *            by the size of any preceding MAC header.
 *
 * Returned Value:
 *   None
 *
 * Assumptions:
 *   Called with the network locked.
 *
 ****************************************************************************/

void sixlowpan_tcp_send(FAR struct net_driver_s *dev,
                        FAR struct net_driver_s *fwddev,
                        FAR struct ipv6_hdr_s *ipv6);

/****************************************************************************
 * Name: sixlowpan_icmpv6_send
 *
 * Description:
 *   All outgoing ICMPv6 messages come through one of two mechanisms:
 *
 *     1. The output from internal ICMPv6 message passing.  These outgoing
 *        messages will use device polling.
 *     2. ICMPv6 output resulting from TX or timer polling.
 *
 *   Both cases are handled here.
 *
 * Input Parameters:
 *   dev    - The network device containing the packet to be sent.
 *   fwddev - The network device used to send the data.  This will be the
 *            same device except for the IP forwarding case where packets
 *            are sent across devices.
 *   ipv6   - A pointer to the IPv6 header in dev->d_buf which lies AFTER
 *            the L1 header.  NOTE: dev->d_len must have been decremented
 *            by the size of any preceding MAC header.
 *
 * Returned Value:
 *   None
 *
 * Assumptions:
 *   Called with the network locked.
 *
 ****************************************************************************/

#ifdef CONFIG_NET_ICMPv6
void sixlowpan_icmpv6_send(FAR struct net_driver_s *dev,
                           FAR struct net_driver_s *fwddev,
                           FAR struct ipv6_hdr_s *ipv6);
#endif

/****************************************************************************
 * Name: psock_6lowpan_udp_send
 *
 * Description:
 *   psock_6lowpan_udp_send() call may be used with connectionlesss UDP
 *   sockets.
 *
 * Input Parameters:
 *   psock - An instance of the internal socket structure.
 *   buf   - Data to send
 *   len   - Length of data to send
 *
 * Returned Value:
 *   On success, returns the number of characters sent.  On  error,
 *   -1 is returned, and errno is set appropriately.  Returned error numbers
 *   must be consistent with definition of errors reported by send() or
 *   sendto().
 *
 * Assumptions:
 *   Called with the network locked.
 *
 ****************************************************************************/

#ifdef CONFIG_NET_UDP
ssize_t psock_6lowpan_udp_send(FAR struct socket *psock, FAR const void *buf,
                               size_t len);
#endif

/****************************************************************************
 * Name: psock_6lowpan_udp_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,
 *   -1 is returned, and errno is set appropriately.    Returned error
 *   number must be consistent with definition of errors reported by
 *   sendto().
 *
 * Assumptions:
 *   Called with the network locked.
 *
 ****************************************************************************/

ssize_t psock_6lowpan_udp_sendto(FAR struct socket *psock,
                                 FAR const void *buf,
                                 size_t len, int flags,
                                 FAR const struct sockaddr *to,
                                 socklen_t tolen);

/****************************************************************************
 * Name: sixlowpan_udp_send
 *
 * Description:
 *   Handles forwarding a UDP packet via 6LoWPAN.  This is currently only
 *   used by the IPv6 forwarding logic.
 *
 * Input Parameters:
 *   dev    - An instance of network device state structure
 *   fwddev - The network device used to send the data.  This will be the
 *            same device except for the IP forwarding case where packets
 *            are sent across devices.
 *   ipv6   - A pointer to the IPv6 header in dev->d_buf which lies AFTER
 *            the L1 header.  NOTE: dev->d_len must have been decremented
 *            by the size of any preceding MAC header.
 *
 * Returned Value:
 *   None
 *
 * Assumptions:
 *   Called with the network locked.
 *
 ****************************************************************************/

#ifdef CONFIG_NET_IPFORWARD
void sixlowpan_udp_send(FAR struct net_driver_s *dev,
                        FAR struct net_driver_s *fwddev,
                        FAR struct ipv6_hdr_s *ipv6);
#endif

#endif /* CONFIG_NET_6LOWPAN */
#endif /* __NET_SIXLOWPAN_SIXLOWPAN_H */
