348 lines
11 KiB
C
348 lines
11 KiB
C
/****************************************************************************
|
|
* 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 <semaphore.h>
|
|
#include <assert.h>
|
|
#include <errno.h>
|
|
#include <debug.h>
|
|
|
|
#include <nuttx/clock.h>
|
|
#include <nuttx/semaphore.h>
|
|
#include <nuttx/net/net.h>
|
|
|
|
#include "netdev/netdev.h"
|
|
#include "devif/devif.h"
|
|
|
|
#include "sixlowpan/sixlowpan_internal.h"
|
|
|
|
#ifdef CONFIG_NET_6LOWPAN
|
|
|
|
/****************************************************************************
|
|
* Pre-processor Definitions
|
|
****************************************************************************/
|
|
|
|
/* These are temporary stubs. Something like this would be needed to
|
|
* monitor the health of a IPv6 neighbor.
|
|
*/
|
|
|
|
#define neighbor_reachable(dev)
|
|
#define neighbor_notreachable(dev)
|
|
|
|
/****************************************************************************
|
|
* Private Types
|
|
****************************************************************************/
|
|
|
|
/* This is the state data provided to the send interrupt logic. No actions
|
|
* can be taken until the until we receive the TX poll, then we can call
|
|
* sixlowpan_queue_frames() with this data strurcture.
|
|
*/
|
|
|
|
struct sixlowpan_send_s
|
|
{
|
|
FAR struct devif_callback_s *s_cb; /* Reference to callback instance */
|
|
sem_t s_waitsem; /* Supports waiting for driver events */
|
|
int s_result; /* The result of the transfer */
|
|
uint16_t s_timeout; /* Send timeout in deciseconds */
|
|
systime_t s_time; /* Last send time for determining timeout */
|
|
FAR const struct ipv6_hdr_s *s_ipv6hdr; /* IPv6 header, followed by UDP or TCP header. */
|
|
FAR const struct sixlowpan_tagaddr_s *s_destmac; /* Destination MAC address */
|
|
FAR const void *s_buf; /* Data to send */
|
|
size_t s_len; /* Length of data in buf */
|
|
};
|
|
|
|
/****************************************************************************
|
|
* Private Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: send_timeout
|
|
*
|
|
* Description:
|
|
* Check for send timeout.
|
|
*
|
|
* Input Parameters:
|
|
* sinfo - Send state structure reference
|
|
*
|
|
* Returned Value:
|
|
* TRUE:timeout FALSE:no timeout
|
|
*
|
|
* Assumptions:
|
|
* The network is locked
|
|
*
|
|
****************************************************************************/
|
|
|
|
static inline bool send_timeout(FAR struct sixlowpan_send_s *sinfo)
|
|
{
|
|
/* Check for a timeout. Zero means none and, in that case, we will let
|
|
* the send wait forever.
|
|
*/
|
|
|
|
if (sinfo->s_timeout != 0)
|
|
{
|
|
/* Check if the configured timeout has elapsed */
|
|
|
|
systime_t timeo_ticks = DSEC2TICK(sinfo->s_timeout);
|
|
systime_t elapsed = clock_systimer() - sinfo->s_time;
|
|
|
|
if (elapsed >= timeo_ticks)
|
|
{
|
|
return true;
|
|
}
|
|
}
|
|
|
|
/* No timeout */
|
|
|
|
return false;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: send_interrupt
|
|
*
|
|
* Description:
|
|
* This function is called from the interrupt level to perform the actual
|
|
* send operation when polled by the lower, device interfacing layer.
|
|
*
|
|
* Parameters:
|
|
* dev - The structure of the network driver that caused the interrupt
|
|
* conn - The connection structure associated with the socket
|
|
* flags - Set of events describing why the callback was invoked
|
|
*
|
|
* Returned Value:
|
|
* None
|
|
*
|
|
* Assumptions:
|
|
* The network is locked.
|
|
*
|
|
****************************************************************************/
|
|
|
|
static uint16_t send_interrupt(FAR struct net_driver_s *dev,
|
|
FAR void *pvconn,
|
|
FAR void *pvpriv, uint16_t flags)
|
|
{
|
|
FAR struct sixlowpan_send_s *sinfo = (FAR struct sixlowpan_send_s *)pvpriv;
|
|
|
|
ninfo("flags: %04x: %d\n", flags);
|
|
|
|
#ifdef CONFIG_NET_MULTILINK
|
|
/* Verify that this is an IEEE802.15.4 network driver. */
|
|
|
|
if (dev->d_lltype != NET_LL_IEEE802154)
|
|
{
|
|
return flags;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_NET_MULTINIC
|
|
/* REVISIT: Verify that this is the correct IEEE802.15.4 network driver to
|
|
* route the outgoing frame(s). Chances are that there is only one
|
|
* IEEE802.15.4 network driver
|
|
*/
|
|
|
|
#endif
|
|
|
|
/* Check if the IEEE802.15.4 network driver went down */
|
|
|
|
if ((flags & NETDEV_DOWN) != 0)
|
|
{
|
|
nwarn("WARNING: Device is down\n");
|
|
sinfo->s_result = -ENOTCONN;
|
|
goto end_wait;
|
|
}
|
|
|
|
/* Check for a poll for TX data. */
|
|
|
|
if ((flags & WPAN_NEWDATA) == 0)
|
|
{
|
|
DEBUGASSERT((flags & WPAN_POLL) != 0);
|
|
|
|
/* Transfer the frame list to the IEEE802.15.4 MAC device */
|
|
|
|
sinfo->s_result =
|
|
sixlowpan_queue_frames((FAR struct ieee802154_driver_s *)dev,
|
|
sinfo->s_ipv6hdr, sinfo->s_buf, sinfo->s_len,
|
|
sinfo->s_destmac);
|
|
|
|
flags &= ~WPAN_POLL;
|
|
neighbor_reachable(dev);
|
|
goto end_wait;
|
|
}
|
|
|
|
/* Check for a timeout. */
|
|
|
|
if (send_timeout(sinfo))
|
|
{
|
|
/* Yes.. report the timeout */
|
|
|
|
nwarn("WARNING: SEND timeout\n");
|
|
sinfo->s_result = -ETIMEDOUT;
|
|
neighbor_notreachable(dev);
|
|
goto end_wait;
|
|
}
|
|
|
|
/* Continue waiting */
|
|
|
|
return flags;
|
|
|
|
end_wait:
|
|
/* Do not allow any further callbacks */
|
|
|
|
sinfo->s_cb->flags = 0;
|
|
sinfo->s_cb->priv = NULL;
|
|
sinfo->s_cb->event = NULL;
|
|
|
|
/* Wake up the waiting thread */
|
|
|
|
sem_post(&sinfo->s_waitsem);
|
|
return flags;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* 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 'buflen'.
|
|
* Compressed headers will be added and if necessary the packet is
|
|
* fragmented. The resulting packet/fragments are submitted to the MAC
|
|
* via the network driver i_req_data method.
|
|
*
|
|
* Input Parameters:
|
|
* dev - The IEEE802.15.4 MAC network driver interface.
|
|
* list - Head of callback list for send interrupt
|
|
* ipv6hdr - IPv6 header followed by TCP or UDP header.
|
|
* buf - Data to send
|
|
* len - Length of data to send
|
|
* destmac - The IEEE802.15.4 MAC address of the destination
|
|
* timeout - Send timeout in deciseconds
|
|
*
|
|
* 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,
|
|
FAR struct devif_callback_s **list,
|
|
FAR const struct ipv6_hdr_s *ipv6hdr, FAR const void *buf,
|
|
size_t len, FAR const struct sixlowpan_tagaddr_s *destmac,
|
|
uint16_t timeout)
|
|
{
|
|
struct sixlowpan_send_s sinfo;
|
|
|
|
ninfo("len=%lu timeout=%u\n", (unsigned long)len, timeout);
|
|
|
|
/* Initialize the send state structure */
|
|
|
|
sem_init(&sinfo.s_waitsem, 0, 0);
|
|
(void)sem_setprotocol(&sinfo.s_waitsem, SEM_PRIO_NONE);
|
|
|
|
sinfo.s_result = -EBUSY;
|
|
sinfo.s_timeout = timeout;
|
|
sinfo.s_time = clock_systimer();
|
|
sinfo.s_ipv6hdr = ipv6hdr;
|
|
sinfo.s_destmac = destmac;
|
|
sinfo.s_buf = buf;
|
|
sinfo.s_len = len;
|
|
|
|
net_lock();
|
|
if (len > 0)
|
|
{
|
|
/* Allocate resources to receive a callback.
|
|
*
|
|
* The second parameter is NULL meaning that we can get only
|
|
* device related events, no connect-related events.
|
|
*/
|
|
|
|
sinfo.s_cb = devif_callback_alloc(dev, list);
|
|
if (sinfo.s_cb != NULL)
|
|
{
|
|
int ret;
|
|
|
|
/* Set up the callback in the connection */
|
|
|
|
sinfo.s_cb->flags = (NETDEV_DOWN | WPAN_POLL);
|
|
sinfo.s_cb->priv = (FAR void *)&sinfo;
|
|
sinfo.s_cb->event = send_interrupt;
|
|
|
|
/* Notify the IEEE802.15.4 MAC that we have data to send. */
|
|
|
|
netdev_txnotify_dev(dev);
|
|
|
|
/* Wait for the send to complete or an error to occur: NOTES: (1)
|
|
* net_lockedwait will also terminate if a signal is received, (2) interrupts
|
|
* may be disabled! They will be re-enabled while the task sleeps and
|
|
* automatically re-enabled when the task restarts.
|
|
*/
|
|
|
|
ninfo("Wait for send complete\n");
|
|
|
|
ret = net_lockedwait(&sinfo.s_waitsem);
|
|
if (ret < 0)
|
|
{
|
|
sinfo.s_result = -get_errno();
|
|
}
|
|
|
|
/* Make sure that no further interrupts are processed */
|
|
|
|
devif_conn_callback_free(dev, sinfo.s_cb, list);
|
|
}
|
|
}
|
|
|
|
sem_destroy(&sinfo.s_waitsem);
|
|
net_unlock();
|
|
|
|
return (sinfo.s_result < 0 ? sinfo.s_result : len);
|
|
}
|
|
|
|
#endif /* CONFIG_NET_6LOWPAN */
|