5b13797cce
Do not use pvconn argument to get the TCP connection pointer because pvconn is normally NULL for some events like NETDEV_DOWN. Instead, the TCP connection pointer can be reliably obtained from the corresponding TCP socket.
582 lines
17 KiB
C
582 lines
17 KiB
C
/****************************************************************************
|
|
* net/devif/devif_callback.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>
|
|
#if defined(CONFIG_NET)
|
|
|
|
#include <stdint.h>
|
|
#include <stdbool.h>
|
|
#include <string.h>
|
|
#include <debug.h>
|
|
#include <assert.h>
|
|
|
|
#include <nuttx/kmalloc.h>
|
|
#include <nuttx/net/netconfig.h>
|
|
#include <nuttx/net/net.h>
|
|
#include <nuttx/net/netdev.h>
|
|
|
|
#include "netdev/netdev.h"
|
|
#include "devif/devif.h"
|
|
|
|
/****************************************************************************
|
|
* Private Data
|
|
****************************************************************************/
|
|
|
|
#ifndef CONFIG_NET_ALLOC_CONNS
|
|
static struct devif_callback_s g_cbprealloc[CONFIG_NET_NACTIVESOCKETS];
|
|
#endif
|
|
static FAR struct devif_callback_s *g_cbfreelist = NULL;
|
|
|
|
/****************************************************************************
|
|
* Private Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: devif_callback_free
|
|
*
|
|
* Description:
|
|
* Return a callback container to the free list.
|
|
*
|
|
* Assumptions:
|
|
* This function is called with the network locked.
|
|
*
|
|
****************************************************************************/
|
|
|
|
static void devif_callback_free(FAR struct net_driver_s *dev,
|
|
FAR struct devif_callback_s *cb,
|
|
FAR struct devif_callback_s **list_head,
|
|
FAR struct devif_callback_s **list_tail)
|
|
{
|
|
FAR struct devif_callback_s *prev;
|
|
FAR struct devif_callback_s *curr;
|
|
|
|
if (cb)
|
|
{
|
|
net_lock();
|
|
|
|
#ifdef CONFIG_DEBUG_FEATURES
|
|
/* Check for double freed callbacks */
|
|
|
|
curr = g_cbfreelist;
|
|
|
|
while (curr != NULL)
|
|
{
|
|
DEBUGASSERT(cb != curr);
|
|
curr = curr->nxtconn;
|
|
}
|
|
#endif
|
|
|
|
/* Remove the callback structure from the device notification list if
|
|
* it is supposed to be in the device notification list.
|
|
*/
|
|
|
|
if (dev != NULL)
|
|
{
|
|
/* Find the callback structure in the device event list */
|
|
|
|
for (prev = NULL, curr = dev->d_devcb;
|
|
curr != NULL && curr != cb;
|
|
prev = curr, curr = curr->nxtdev)
|
|
{
|
|
}
|
|
|
|
/* Remove the structure from the device event list */
|
|
|
|
if (curr != NULL)
|
|
{
|
|
if (prev)
|
|
{
|
|
prev->nxtdev = cb->nxtdev;
|
|
}
|
|
else
|
|
{
|
|
dev->d_devcb = cb->nxtdev;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Remove the callback structure from the data notification list if
|
|
* it is supposed to be in the data notification list.
|
|
*/
|
|
|
|
if (list_head)
|
|
{
|
|
prev = cb->prevconn;
|
|
|
|
/* Remove the structure from the connection event list */
|
|
|
|
if (prev)
|
|
{
|
|
/* The item to be removed is not in the head. */
|
|
|
|
prev->nxtconn = cb->nxtconn;
|
|
|
|
if (cb->nxtconn)
|
|
{
|
|
/* The item to be removed is not in the tail. */
|
|
|
|
cb->nxtconn->prevconn = prev;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* The item to be removed is in the head. */
|
|
|
|
*list_head = cb->nxtconn;
|
|
|
|
if (cb->nxtconn)
|
|
{
|
|
/* There are more items besides the head item. */
|
|
|
|
cb->nxtconn->prevconn = NULL;
|
|
}
|
|
}
|
|
|
|
if (!cb->nxtconn)
|
|
{
|
|
/* If the tail item is being removed,
|
|
* update the tail pointer.
|
|
*/
|
|
|
|
DEBUGASSERT(list_tail);
|
|
*list_tail = prev;
|
|
}
|
|
}
|
|
|
|
/* Put the structure into the free list */
|
|
|
|
cb->nxtconn = g_cbfreelist;
|
|
cb->nxtdev = NULL;
|
|
g_cbfreelist = cb;
|
|
net_unlock();
|
|
}
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: devif_event_trigger
|
|
*
|
|
* Description:
|
|
* Return true if the current set of events should trigger a callback to
|
|
* occur.
|
|
*
|
|
* Input Parameters:
|
|
* events - The set of events that has occurred.
|
|
* triggers - The set of events that will trigger a callback.
|
|
*
|
|
****************************************************************************/
|
|
|
|
static bool devif_event_trigger(uint16_t events, uint16_t triggers)
|
|
{
|
|
/* The events are divided into a set of individual bits that may be ORed
|
|
* together PLUS a field that encodes a single poll event.
|
|
*
|
|
* First check if any of the individual event bits will trigger the
|
|
* callback.
|
|
*/
|
|
|
|
if ((events & triggers & ~DEVPOLL_MASK) != 0)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
/* No... check the encoded device event. */
|
|
|
|
if ((events & DEVPOLL_MASK) == (triggers & DEVPOLL_MASK))
|
|
{
|
|
return (triggers & DEVPOLL_MASK) != 0;
|
|
}
|
|
|
|
/* No.. this event set will not generate the callback */
|
|
|
|
return false;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: devif_callback_init
|
|
*
|
|
* Description:
|
|
* Configure the pre-allocated callback structures into a free list.
|
|
*
|
|
* Assumptions:
|
|
* Called early in the initialization sequence so that no special
|
|
* protection is required.
|
|
*
|
|
****************************************************************************/
|
|
|
|
void devif_callback_init(void)
|
|
{
|
|
#ifndef CONFIG_NET_ALLOC_CONNS
|
|
int i;
|
|
|
|
for (i = 0; i < CONFIG_NET_NACTIVESOCKETS; i++)
|
|
{
|
|
g_cbprealloc[i].nxtconn = g_cbfreelist;
|
|
g_cbfreelist = &g_cbprealloc[i];
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: devif_callback_alloc
|
|
*
|
|
* Description:
|
|
* Allocate a callback container from the free list.
|
|
*
|
|
* If dev is non-NULL, then this function verifies that the device
|
|
* reference is still valid and that the device is still UP status. If
|
|
* those conditions are not true, this function will fail to allocate the
|
|
* callback.
|
|
*
|
|
* Assumptions:
|
|
* This function is called with the network locked.
|
|
*
|
|
****************************************************************************/
|
|
|
|
FAR struct devif_callback_s *
|
|
devif_callback_alloc(FAR struct net_driver_s *dev,
|
|
FAR struct devif_callback_s **list_head,
|
|
FAR struct devif_callback_s **list_tail)
|
|
{
|
|
FAR struct devif_callback_s *ret;
|
|
#ifdef CONFIG_NET_ALLOC_CONNS
|
|
int i;
|
|
#endif
|
|
|
|
net_lock();
|
|
|
|
/* Verify that the device pointer is valid, i.e., that it still
|
|
* points to a registered network device and also that the network
|
|
* device in the UP state.
|
|
*/
|
|
|
|
/* Note: dev->d_flags may be asynchronously changed by netdev_ifdown()
|
|
* (in net/netdev/netdev_ioctl.c). Nevertheless, net_lock() / net_unlock()
|
|
* are not required in netdev_ifdown() to prevent dev->d_flags from
|
|
* asynchronous change here. There is not an issue because net_lock() and
|
|
* net_unlock() present inside of devif_dev_event(). That should be enough
|
|
* to de-allocate connection callbacks reliably on NETDEV_DOWN event.
|
|
*/
|
|
|
|
if (dev && !netdev_verify(dev) && (dev->d_flags & IFF_UP) != 0)
|
|
{
|
|
net_unlock();
|
|
return NULL;
|
|
}
|
|
|
|
/* Allocate the callback entry from heap */
|
|
|
|
#ifdef CONFIG_NET_ALLOC_CONNS
|
|
if (g_cbfreelist == NULL)
|
|
{
|
|
ret = kmm_zalloc(sizeof(struct devif_callback_s) *
|
|
CONFIG_NET_NACTIVESOCKETS);
|
|
if (ret != NULL)
|
|
{
|
|
for (i = 0; i < CONFIG_NET_NACTIVESOCKETS; i++)
|
|
{
|
|
ret[i].nxtconn = g_cbfreelist;
|
|
g_cbfreelist = &ret[i];
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/* Check the head of the free list */
|
|
|
|
ret = g_cbfreelist;
|
|
if (ret)
|
|
{
|
|
/* Remove the next instance from the head of the free list */
|
|
|
|
g_cbfreelist = ret->nxtconn;
|
|
memset(ret, 0, sizeof(struct devif_callback_s));
|
|
|
|
/* Add the newly allocated instance to the head of the device event
|
|
* list.
|
|
*/
|
|
|
|
if (dev)
|
|
{
|
|
ret->nxtdev = dev->d_devcb;
|
|
dev->d_devcb = ret;
|
|
}
|
|
|
|
/* Add the newly allocated instance to the tail of the specified list */
|
|
|
|
if (list_head && list_tail)
|
|
{
|
|
ret->nxtconn = NULL;
|
|
ret->prevconn = *list_tail;
|
|
|
|
if (*list_tail)
|
|
{
|
|
/* If the list is not empty, add the item to the tail. */
|
|
|
|
(*list_tail)->nxtconn = ret;
|
|
}
|
|
else
|
|
{
|
|
/* If the list is empty, add the first item to the list. */
|
|
|
|
*list_head = ret;
|
|
}
|
|
|
|
/* Update the tail pointer */
|
|
|
|
*list_tail = ret;
|
|
}
|
|
}
|
|
#ifdef CONFIG_DEBUG_FEATURES
|
|
else
|
|
{
|
|
nerr("ERROR: Failed to allocate callback\n");
|
|
}
|
|
#endif
|
|
|
|
net_unlock();
|
|
return ret;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: devif_conn_callback_free
|
|
*
|
|
* Description:
|
|
* Return a connection/port callback container to the free list.
|
|
*
|
|
* This function is just a front-end for devif_callback_free(). If the
|
|
* dev argument is non-NULL, it will verify that the device reference is
|
|
* still valid before attempting to free the callback structure. A
|
|
* non-NULL list pointer is assumed to be valid in any case.
|
|
*
|
|
* The callback structure will be freed in any event.
|
|
*
|
|
* Assumptions:
|
|
* This function is called with the network locked.
|
|
*
|
|
****************************************************************************/
|
|
|
|
void devif_conn_callback_free(FAR struct net_driver_s *dev,
|
|
FAR struct devif_callback_s *cb,
|
|
FAR struct devif_callback_s **list_head,
|
|
FAR struct devif_callback_s **list_tail)
|
|
{
|
|
/* Check if the device pointer is still valid. It could be invalid if, for
|
|
* example, the device were unregistered between the time when the callback
|
|
* was allocated and the time when the callback was freed.
|
|
*/
|
|
|
|
if (dev && !netdev_verify(dev))
|
|
{
|
|
/* The device reference is longer valid */
|
|
|
|
dev = NULL;
|
|
}
|
|
|
|
/* Then free the callback */
|
|
|
|
devif_callback_free(dev, cb, list_head, list_tail);
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: devif_dev_callback_free
|
|
*
|
|
* Description:
|
|
* Return a device callback container to the free list.
|
|
*
|
|
* This function is just a front-end for devif_callback_free(). If the
|
|
* de argument is non-NULL, it will verify that the device reference is
|
|
* still valid before attempting to free the callback structure. It
|
|
* differs from devif_conn_callback_free in that connection/port-related
|
|
* connections are also associated with the device and, hence, also will
|
|
* not be valid if the device pointer is not valid.
|
|
*
|
|
* The callback structure will be freed in any event.
|
|
*
|
|
* Assumptions:
|
|
* This function is called with the network locked.
|
|
*
|
|
****************************************************************************/
|
|
|
|
void devif_dev_callback_free(FAR struct net_driver_s *dev,
|
|
FAR struct devif_callback_s *cb)
|
|
{
|
|
FAR struct devif_callback_s **list_head;
|
|
FAR struct devif_callback_s **list_tail;
|
|
|
|
/* Check if the device pointer is still valid. It could be invalid if, for
|
|
* example, the device were unregistered between the time when the callback
|
|
* was allocated and the time when the callback was freed.
|
|
*/
|
|
|
|
if (dev != NULL && netdev_verify(dev))
|
|
{
|
|
/* The device reference is valid. Then use the list pointer in the
|
|
* device structure as well.
|
|
*/
|
|
|
|
list_head = &dev->d_conncb;
|
|
list_tail = &dev->d_conncb_tail;
|
|
}
|
|
else
|
|
{
|
|
/* The device reference is longer valid */
|
|
|
|
dev = NULL;
|
|
list_head = NULL;
|
|
list_tail = NULL;
|
|
}
|
|
|
|
/* Then free the callback */
|
|
|
|
devif_callback_free(dev, cb, list_head, list_tail);
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: devif_conn_event
|
|
*
|
|
* Description:
|
|
* Execute a list of callbacks using the packet event chain.
|
|
*
|
|
* Input Parameters:
|
|
* dev - The network device state structure associated with the network
|
|
* device that initiated the callback event.
|
|
* pvconn - Holds a reference to the TCP connection structure or the UDP
|
|
* port structure. It can be NULL if the event is not related to a TCP
|
|
* connection or UDP port.
|
|
* flags - The bit set of events to be notified.
|
|
* list - The list to traverse in performing the notifications
|
|
*
|
|
* Returned Value:
|
|
* The updated flags as modified by the callback functions.
|
|
*
|
|
* Assumptions:
|
|
* This function is called with the network locked.
|
|
*
|
|
****************************************************************************/
|
|
|
|
uint16_t devif_conn_event(FAR struct net_driver_s *dev, void *pvconn,
|
|
uint16_t flags, FAR struct devif_callback_s *list)
|
|
{
|
|
FAR struct devif_callback_s *next;
|
|
|
|
/* Loop for each callback in the list and while there are still events
|
|
* set in the flags set.
|
|
*/
|
|
|
|
net_lock();
|
|
while (list && flags)
|
|
{
|
|
/* Save the pointer to the next callback in the lists. This is done
|
|
* because the callback action might delete the entry pointed to by
|
|
* list.
|
|
*/
|
|
|
|
next = list->nxtconn;
|
|
|
|
/* Check if this callback handles any of the events in the flag set */
|
|
|
|
if (list->event != NULL && devif_event_trigger(flags, list->flags))
|
|
{
|
|
/* Yes.. perform the callback. Actions perform by the callback
|
|
* may delete the current list entry or add a new list entry to
|
|
* beginning of the list (which will be ignored on this pass)
|
|
*/
|
|
|
|
flags = list->event(dev, pvconn, list->priv, flags);
|
|
}
|
|
|
|
/* Set up for the next time through the loop */
|
|
|
|
list = next;
|
|
}
|
|
|
|
net_unlock();
|
|
return flags;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: devif_dev_event
|
|
*
|
|
* Description:
|
|
* Execute a list of callbacks using the device event chain.
|
|
*
|
|
* Input Parameters:
|
|
* dev - The network device state structure associated with the network
|
|
* device that initiated the callback event.
|
|
* pvconn - Holds a reference to the TCP connection structure or the UDP
|
|
* port structure. It can be NULL if the event is not related to a TCP
|
|
* connection or UDP port.
|
|
* flags - The bit set of events to be notified.
|
|
*
|
|
* Returned Value:
|
|
* The updated flags as modified by the callback functions.
|
|
*
|
|
* Assumptions:
|
|
* This function is called with the network locked.
|
|
*
|
|
****************************************************************************/
|
|
|
|
uint16_t devif_dev_event(FAR struct net_driver_s *dev, void *pvconn,
|
|
uint16_t flags)
|
|
{
|
|
FAR struct devif_callback_s *cb;
|
|
FAR struct devif_callback_s *next;
|
|
|
|
/* Loop for each callback in the list and while there are still events
|
|
* set in the flags set.
|
|
*/
|
|
|
|
net_lock();
|
|
for (cb = dev->d_devcb; cb != NULL && flags != 0; cb = next)
|
|
{
|
|
/* Save the pointer to the next callback in the lists. This is done
|
|
* because the callback action might delete the entry pointed to by
|
|
* list.
|
|
*/
|
|
|
|
next = cb->nxtdev;
|
|
|
|
/* Check if this callback handles any of the events in the flag set */
|
|
|
|
if (cb->event != NULL && devif_event_trigger(flags, cb->flags))
|
|
{
|
|
/* Yes.. perform the callback. Actions perform by the callback
|
|
* may delete the current list entry or add a new list entry to
|
|
* beginning of the list (which will be ignored on this pass)
|
|
*/
|
|
|
|
flags = cb->event(dev, pvconn, cb->priv, flags);
|
|
}
|
|
}
|
|
|
|
net_unlock();
|
|
return flags;
|
|
}
|
|
|
|
#endif /* CONFIG_NET */
|