279 lines
8.9 KiB
C
279 lines
8.9 KiB
C
/****************************************************************************
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* net/sixlowpan/sixlowpan_send.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <assert.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/semaphore.h>
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#include <nuttx/net/net.h>
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#include <nuttx/net/radiodev.h>
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#include "netdev/netdev.h"
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#include "devif/devif.h"
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#include "sixlowpan/sixlowpan_internal.h"
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#ifdef CONFIG_NET_6LOWPAN
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* These are temporary stubs. Something like this would be needed to
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* monitor the health of a IPv6 neighbor.
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*/
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#define neighbor_reachable(dev)
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#define neighbor_notreachable(dev)
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/* This is the state data provided to the send event handler. No actions
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* can be taken until the until we receive the TX poll, then we can call
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* sixlowpan_queue_frames() with this data strurcture.
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*/
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struct sixlowpan_send_s
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{
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FAR struct devif_callback_s *s_cb; /* Reference to callback
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* instance */
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sem_t s_waitsem; /* Supports waiting for
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* driver events */
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int s_result; /* The result of the transfer */
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FAR const struct ipv6_hdr_s *s_ipv6hdr; /* IPv6 header, followed by
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* UDP or ICMP header. */
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FAR const struct netdev_varaddr_s *s_destmac; /* Destination MAC address */
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FAR const void *s_buf; /* Data to send */
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size_t s_len; /* Length of data in buf */
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};
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: send_eventhandler
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*
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* Description:
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* This function is called with the network locked to perform the actual
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* send operation when polled by the lower, device interfacing layer.
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*
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* Input Parameters:
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* dev - The structure of the network driver that generated the event.
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* pvpriv - An instance of struct sixlowpan_send_s cast to void*
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* flags - Set of events describing why the callback was invoked
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*
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* Returned Value:
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* None
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*
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* Assumptions:
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* The network is locked.
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*
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****************************************************************************/
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static uint16_t send_eventhandler(FAR struct net_driver_s *dev,
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FAR void *pvpriv, uint16_t flags)
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{
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FAR struct sixlowpan_send_s *sinfo = pvpriv;
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ninfo("flags: %04x\n", flags);
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/* Verify that this is a compatible network driver. */
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if (dev->d_lltype != NET_LL_IEEE802154 &&
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dev->d_lltype != NET_LL_PKTRADIO)
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{
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ninfo("Not a compatible network device\n");
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return flags;
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}
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/* REVISIT: Verify that this is the correct IEEE802.15.4 network driver to
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* route the outgoing frame(s). Chances are that there is only one
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* IEEE802.15.4 network driver
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*/
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/* Check if the IEEE802.15.4 network driver went down */
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if ((flags & NETDEV_DOWN) != 0)
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{
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nwarn("WARNING: Device is down\n");
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sinfo->s_result = -ENOTCONN;
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goto end_wait;
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}
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/* Check for a poll for TX data. */
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if ((flags & WPAN_NEWDATA) == 0)
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{
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DEBUGASSERT((flags & WPAN_POLL) != 0);
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/* Transfer the frame list to the IEEE802.15.4 MAC device */
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sinfo->s_result =
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sixlowpan_queue_frames((FAR struct radio_driver_s *)dev,
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sinfo->s_ipv6hdr, sinfo->s_buf, sinfo->s_len,
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sinfo->s_destmac);
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flags &= ~WPAN_POLL;
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neighbor_reachable(dev);
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goto end_wait;
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}
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/* Continue waiting */
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return flags;
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end_wait:
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/* Do not allow any further callbacks */
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sinfo->s_cb->flags = 0;
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sinfo->s_cb->priv = NULL;
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sinfo->s_cb->event = NULL;
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/* Wake up the waiting thread */
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nxsem_post(&sinfo->s_waitsem);
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return flags;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: sixlowpan_send
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*
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* Description:
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* Process an outgoing UDP or ICMPv6 packet. Takes an IP packet and
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* formats it to be sent on an 802.15.4 network using 6lowpan. Called
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* from common UDP/ICMPv6 send logic.
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*
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* The payload data is in the caller 'buf' and is of length 'buflen'.
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* Compressed headers will be added and if necessary the packet is
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* fragmented. The resulting packet/fragments are submitted to the MAC
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* via the network driver r_req_data method.
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*
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* Input Parameters:
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* dev - The IEEE802.15.4 MAC network driver interface.
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* list - Head of callback list for send events
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* ipv6hdr - IPv6 header followed by UDP or ICMPv6 header.
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* buf - Data to send
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* len - Length of data to send
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* destmac - The IEEE802.15.4 MAC address of the destination
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* timeout - Send timeout in milliseconds
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*
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* Returned Value:
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* Ok is returned on success; Otherwise a negated errno value is returned.
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* This function is expected to fail if the driver is not an IEEE802.15.4
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* MAC network driver. In that case, the logic will fall back to normal
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* IPv4/IPv6 formatting.
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*
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* Assumptions:
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* Called with the network locked.
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*
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****************************************************************************/
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int sixlowpan_send(FAR struct net_driver_s *dev,
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FAR struct devif_callback_s **list,
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FAR struct devif_callback_s **list_tail,
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FAR const struct ipv6_hdr_s *ipv6hdr, FAR const void *buf,
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size_t len, FAR const struct netdev_varaddr_s *destmac,
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unsigned int timeout)
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{
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struct sixlowpan_send_s sinfo;
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ninfo("len=%lu timeout=%u\n", (unsigned long)len, timeout);
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/* Initialize the send state structure */
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nxsem_init(&sinfo.s_waitsem, 0, 0);
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sinfo.s_result = -EBUSY;
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sinfo.s_ipv6hdr = ipv6hdr;
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sinfo.s_destmac = destmac;
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sinfo.s_buf = buf;
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sinfo.s_len = len;
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net_lock();
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if (len > 0)
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{
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/* Allocate resources to receive a callback.
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*
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* The second parameter is NULL meaning that we can get only
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* device related events, no connect-related events.
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*/
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sinfo.s_cb = devif_callback_alloc(dev, list, list_tail);
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if (sinfo.s_cb != NULL)
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{
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int ret;
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/* Set up the callback in the connection */
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sinfo.s_cb->flags = (NETDEV_DOWN | WPAN_POLL);
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sinfo.s_cb->priv = (FAR void *)&sinfo;
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sinfo.s_cb->event = send_eventhandler;
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/* Notify the IEEE802.15.4 MAC that we have data to send. */
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netdev_txnotify_dev(dev);
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/* Wait for the send to complete or an error to occur.
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* net_timedwait will also terminate if a signal is received.
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*/
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ninfo("Wait for send complete\n");
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ret = net_timedwait(&sinfo.s_waitsem, timeout);
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if (ret < 0)
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{
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if (ret == -ETIMEDOUT)
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{
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ret = -EAGAIN;
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neighbor_notreachable(dev);
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}
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sinfo.s_result = ret;
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}
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/* Make sure that no further events are processed */
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devif_conn_callback_free(dev, sinfo.s_cb, list, list_tail);
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}
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}
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nxsem_destroy(&sinfo.s_waitsem);
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net_unlock();
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return (sinfo.s_result < 0 ? sinfo.s_result : len);
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}
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#endif /* CONFIG_NET_6LOWPAN */
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