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nuttx/net/sixlowpan/sixlowpan_send.c

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/****************************************************************************
* net/sixlowpan/sixlowpan_send.c
*
* Copyright (C) 2017 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <assert.h>
#include <errno.h>
#include <debug.h>
#include "nuttx/net/net.h"
#include "nuttx/net/netdev.h"
#include "netdev/netdev.h"
#include "socket/socket.h"
#include "tcp/tcp.h"
#include "udp/udp.h"
#include "sixlowpan/sixlowpan.h"
#ifdef CONFIG_NET_6LOWPAN
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: sixlowpan_send
*
* Description:
* Process an outgoing UDP or TCP packet. Takes an IP packet and formats
* it to be sent on an 802.15.4 network using 6lowpan. Called from common
* UDP/TCP send logic.
*
* The payload data is in the caller 'buf' and is of length 'len'.
* Compressed headers will be added and if necessary the packet is
* fragmented. The resulting packet/fragments are put in dev->d_buf and
* the first frame will be delivered to the 802.15.4 MAC. via ieee->i_frame.
*
* Input Parmeters:
*
* Input Parameters:
* dev - The IEEE802.15.4 MAC network driver interface.
* raddr - The MAC address of the destination
*
* Returned Value:
* Ok is returned on success; Othewise a negated errno value is returned.
* This function is expected to fail if the driver is not an IEEE802.15.4
* MAC network driver. In that case, the UDP/TCP will fall back to normal
* IPv4/IPv6 formatting.
*
* Assumptions:
* Called with the network locked.
*
****************************************************************************/
int sixlowpan_send(FAR struct net_driver_s *dev, net_ipv6addr_t raddr)
{
FAR struct ieee802154_driver_s *ieee = (FAR struct ieee802154_driver_s *)dev;
net_lock();
/* REVISIT: To be provided */
net_unlock();
return -ENOSYS;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Function: 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).
*
* 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().
*
****************************************************************************/
#ifdef CONFIG_NET_TCP
ssize_t psock_6lowpan_tcp_send(FAR struct socket *psock, FAR const void *buf,
size_t len)
{
FAR struct tcp_conn_s *conn;
FAR struct net_driver_s *dev;
int ret;
DEBUGASSERT(psock != NULL && psock->s_crefs > 0);
DEBUGASSERT(psock->s_type == SOCK_STREAM);
/* Make sure that this is a valid socket */
if (psock != NULL || psock->s_crefs <= 0)
{
nerr("ERROR: Invalid socket\n");
return (ssize_t)-EBADF;
}
/* Make sure that this is a connected TCP socket */
if (psock->s_type != SOCK_STREAM || !_SS_ISCONNECTED(psock->s_flags))
{
nerr("ERROR: Not connected\n");
return (ssize_t)-ENOTCONN;
}
/* Get the underlying TCP connection structure */
conn = (FAR struct tcp_conn_s *)psock->s_conn;
DEBUGASSERT(conn != NULL);
#if defined(CONFIG_NET_IPv4) && defined(CONFIG_NET_IPv6)
/* Ignore if not IPv6 domain */
if (conn->domain != PF_INET6)
{
nwarn("WARNING: Not IPv6\n");
return (ssize_t)-EPROTOTYPE;
}
#endif
/* Route outgoing message to the correct device */
#ifdef CONFIG_NETDEV_MULTINIC
dev = netdev_findby_ipv6addr(conn->u.ipv6.laddr, conn->u.ipv6.raddr);
if (dev == NULL || dev->d_lltype != NET_LL_IEEE805154)
{
nwarn("WARNING: Not routable or not IEEE802.15.4 MAC\n");
return (ssize_t)-ENETUNREACH;
}
#else
dev = netdev_findby_ipv6addr(conn->u.ipv6.raddr);
if (dev == NULL)
{
nwarn("WARNING: Not routable\n");
return (ssize_t)-ENETUNREACH;
}
#endif
#ifdef CONFIG_NET_ICMPv6_NEIGHBOR
/* Make sure that the IP address mapping is in the Neighbor Table */
ret = icmpv6_neighbor(conn->u.ipv6.raddr);
if (ret < 0)
{
nerr("ERROR: Not reachable\n");
return (ssize_t)-ENETUNREACH;
}
#endif
/* Set the socket state to sending */
psock->s_flags = _SS_SETSTATE(psock->s_flags, _SF_SEND);
/* If routable, then call sixlowpan_send() to format and send the 6loWPAN
* packet.
*/
ret = sixlowpan_send(dev, conn->u.ipv6.raddr);
if (ret < 0)
{
nerr("ERROR: sixlowpan_send() failed: %d\n", ret);
}
return ret;
}
#endif
/****************************************************************************
* Function: psock_6lowpan_udp_send
*
* Description:
* psock_6lowpan_udp_send() call may be used with connectionlesss UDP
* sockets.
*
* 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().
*
****************************************************************************/
#ifdef CONFIG_NET_UDP
ssize_t psock_6lowpan_udp_send(FAR struct socket *psock, FAR const void *buf,
size_t len)
{
FAR struct udp_conn_s *conn;
FAR struct net_driver_s *dev;
int ret;
DEBUGASSERT(psock != NULL && psock->s_crefs > 0);
DEBUGASSERT(psock->s_type == SOCK_DGRAM);
/* Make sure that this is a valid socket */
if (psock != NULL || psock->s_crefs <= 0)
{
nerr("ERROR: Invalid socket\n");
return (ssize_t)-EBADF;
}
/* Was the UDP socket connected via connect()? */
if (psock->s_type != SOCK_DGRAM || !_SS_ISCONNECTED(psock->s_flags))
{
/* No, then it is not legal to call send() with this socket. */
return -ENOTCONN;
}
/* Get the underlying UDP "connection" structure */
conn = (FAR struct udp_conn_s *)psock->s_conn;
DEBUGASSERT(conn != NULL);
#if defined(CONFIG_NET_IPv4) && defined(CONFIG_NET_IPv6)
/* Ignore if not IPv6 domain */
if (conn->domain != PF_INET6)
{
nwarn("WARNING: Not IPv6\n");
return (ssize_t)-EPROTOTYPE;
}
#endif
/* Route outgoing message to the correct device */
#ifdef CONFIG_NETDEV_MULTINIC
dev = netdev_findby_ipv6addr(conn->u.ipv6.laddr, conn->u.ipv6.raddr);
if (dev == NULL || dev->d_lltype != NET_LL_IEEE805154)
{
nwarn("WARNING: Not routable or not IEEE802.15.4 MAC\n");
return (ssize_t)-ENETUNREACH;
}
#else
dev = netdev_findby_ipv6addr(conn->u.ipv6.raddr);
if (dev == NULL)
{
nwarn("WARNING: Not routable\n");
return (ssize_t)-ENETUNREACH;
}
#endif
#ifdef CONFIG_NET_ICMPv6_NEIGHBOR
/* Make sure that the IP address mapping is in the Neighbor Table */
ret = icmpv6_neighbor(conn->u.ipv6.raddr);
if (ret < 0)
{
nerr("ERROR: Not reachable\n");
return (ssize_t)-ENETUNREACH;
}
#endif
/* Set the socket state to sending */
psock->s_flags = _SS_SETSTATE(psock->s_flags, _SF_SEND);
/* If routable, then call sixlowpan_send() to format and send the 6loWPAN
* packet.
*/
ret = sixlowpan_send(dev, conn->u.ipv6.raddr);
if (ret < 0)
{
nerr("ERROR: sixlowpan_send() failed: %d\n", ret);
}
return ret;
}
#endif
#endif /* CONFIG_NET_6LOWPAN */
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