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incubator-nuttx/net/sixlowpan/sixlowpan_send.c

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/****************************************************************************
* net/sixlowpan/sixlowpan_send.c
*
* 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <assert.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/semaphore.h>
#include <nuttx/net/net.h>
#include <nuttx/net/radiodev.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 event handler. 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 */
FAR const struct ipv6_hdr_s *s_ipv6hdr; /* IPv6 header, followed by
* UDP or ICMP header. */
FAR const struct netdev_varaddr_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_eventhandler
*
* Description:
* This function is called with the network locked to perform the actual
* send operation when polled by the lower, device interfacing layer.
*
* Input Parameters:
* dev - The structure of the network driver that generated the event.
* pvpriv - An instance of struct sixlowpan_send_s cast to void*
* flags - Set of events describing why the callback was invoked
*
* Returned Value:
* None
*
* Assumptions:
* The network is locked.
*
****************************************************************************/
static uint16_t send_eventhandler(FAR struct net_driver_s *dev,
FAR void *pvpriv, uint16_t flags)
{
FAR struct sixlowpan_send_s *sinfo = pvpriv;
ninfo("flags: %04x\n", flags);
/* Verify that this is a compatible network driver. */
if (dev->d_lltype != NET_LL_IEEE802154 &&
dev->d_lltype != NET_LL_PKTRADIO)
{
ninfo("Not a compatible network device\n");
return flags;
}
/* 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
*/
/* 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 radio_driver_s *)dev,
sinfo->s_ipv6hdr, sinfo->s_buf, sinfo->s_len,
sinfo->s_destmac);
flags &= ~WPAN_POLL;
neighbor_reachable(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 */
nxsem_post(&sinfo->s_waitsem);
return flags;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: sixlowpan_send
*
* Description:
* Process an outgoing UDP or ICMPv6 packet. Takes an IP packet and
* formats it to be sent on an 802.15.4 network using 6lowpan. Called
* from common UDP/ICMPv6 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 r_req_data method.
*
* Input Parameters:
* dev - The IEEE802.15.4 MAC network driver interface.
* list - Head of callback list for send events
* ipv6hdr - IPv6 header followed by UDP or ICMPv6 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 milliseconds
*
* Returned Value:
* Ok is returned on success; Otherwise 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 logic 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 struct devif_callback_s **list_tail,
FAR const struct ipv6_hdr_s *ipv6hdr, FAR const void *buf,
size_t len, FAR const struct netdev_varaddr_s *destmac,
unsigned int timeout)
{
struct sixlowpan_send_s sinfo;
ninfo("len=%lu timeout=%u\n", (unsigned long)len, timeout);
/* Initialize the send state structure */
nxsem_init(&sinfo.s_waitsem, 0, 0);
sinfo.s_result = -EBUSY;
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, list_tail);
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_eventhandler;
/* 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.
* net_sem_timedwait will also terminate if a signal is received.
*/
ninfo("Wait for send complete\n");
ret = net_sem_timedwait(&sinfo.s_waitsem, timeout);
if (ret < 0)
{
if (ret == -ETIMEDOUT)
{
ret = -EAGAIN;
neighbor_notreachable(dev);
}
sinfo.s_result = ret;
}
/* Make sure that no further events are processed */
devif_conn_callback_free(dev, sinfo.s_cb, list, list_tail);
}
}
nxsem_destroy(&sinfo.s_waitsem);
net_unlock();
return (sinfo.s_result < 0 ? sinfo.s_result : len);
}
#endif /* CONFIG_NET_6LOWPAN */
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