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nuttx/net/ipforward/ipfwd_forward.c
chao an 8a63d29c6e net/devif_poll: optimize device buffer alloc in txpoll 
Allocate the device buffer only if the protocol really need to send data.
not all protocols require the driver to prepare additional iob before
sending, especially UDP, each iob reserves l2/l3 header in advance
after prepare write buffer, net device could reuse this entry to send directly

Signed-off-by: chao an <anchao@xiaomi.com>
2023-01-13 16:41:10 +08:00

253 lines
7.6 KiB
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/****************************************************************************
* net/ipforward/ipfwd_forward.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 <net/if.h>
#include <nuttx/mm/iob.h>
#include <nuttx/net/net.h>
#include <nuttx/net/netdev.h>
#include <nuttx/net/ip.h>
#include <nuttx/net/netstats.h>
#include "devif/devif.h"
#include "netdev/netdev.h"
#include "arp/arp.h"
#include "neighbor/neighbor.h"
#include "ipforward/ipforward.h"
#ifdef CONFIG_NET_IPFORWARD
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: forward_ipselect
*
* Description:
* If both IPv4 and IPv6 support are enabled, then we will need to select
* which one to use when generating the outgoing packet. If only one
* domain is selected, then the setup is already in place and we need do
* nothing.
*
* Input Parameters:
* fwd - The forwarding state structure
*
* Returned Value:
* None
*
* Assumptions:
* The network is locked.
*
****************************************************************************/
#if defined(CONFIG_NET_IPv4) && defined(CONFIG_NET_IPv6)
static inline void forward_ipselect(FAR struct forward_s *fwd)
{
FAR struct net_driver_s *dev = fwd->f_dev;
/* Select IPv4 or IPv6 */
if (fwd->f_domain == PF_INET)
{
/* Clear a bit in the d_flags to distinguish this from an IPv6 packet */
IFF_SET_IPv4(dev->d_flags);
/* Set the offset to the beginning of the UDP data payload */
dev->d_appdata = IPBUF(IPv4UDP_HDRLEN);
}
else
{
/* Set a bit in the d_flags to distinguish this from an IPv6 packet */
IFF_SET_IPv6(dev->d_flags);
/* Set the offset to the beginning of the UDP data payload */
dev->d_appdata = IPBUF(IPv6UDP_HDRLEN);
}
}
#endif
/****************************************************************************
* Name: ipfwd_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 forward_s cast to (void *)
* flags Set of events describing why the callback was invoked
*
* Returned Value:
* Modified value of the input flags
*
* Assumptions:
* The network is locked
*
****************************************************************************/
static uint16_t ipfwd_eventhandler(FAR struct net_driver_s *dev,
FAR void *pvpriv, uint16_t flags)
{
FAR struct forward_s *fwd = pvpriv;
ninfo("flags: %04x\n", flags);
DEBUGASSERT(fwd != NULL && fwd->f_iob != NULL && fwd->f_dev != NULL);
/* Make sure that this is from the forwarding device */
if (dev == fwd->f_dev)
{
/* If the network device has gone down, then we will have terminate
* the wait now with an error.
*/
if ((flags & NETDEV_DOWN) != 0)
{
/* Terminate the transfer with an error. */
nwarn("WARNING: Network is down... Dropping\n");
ipfwd_dropstats(fwd);
}
/* Check if the outgoing packet is available. It may have been claimed
* by a sendto event handler serving a different thread -OR- if the
* output buffer currently contains unprocessed incoming data. In
* these cases we will just have to wait for the next polling cycle.
*/
else if (dev->d_sndlen > 0 || (flags & IPFWD_NEWDATA) != 0)
{
/* Another thread has beat us sending data or the buffer is busy,
* Wait for the next polling cycle and check again.
*/
return flags;
}
/* It looks like we are good to forward the data */
else
{
/* Copy the user data into d_appdata and send it. */
devif_forward(fwd);
flags &= ~DEVPOLL_MASK;
#if defined(CONFIG_NET_IPv4) && defined(CONFIG_NET_IPv6)
/* If both IPv4 and IPv6 support are enabled, then we will need to
* select which one to use when generating the outgoing packet.
* If only one domain is selected, then the setup is already in
* place and we need do nothing.
*/
forward_ipselect(fwd);
#endif
}
/* Free the allocated callback structure */
fwd->f_cb->flags = 0;
fwd->f_cb->priv = NULL;
fwd->f_cb->event = NULL;
ipfwd_callback_free(dev, fwd->f_cb);
/* Free any IOBs */
if (fwd->f_iob != NULL)
{
iob_free_chain(fwd->f_iob);
}
/* And release the forwarding state structure */
ipfwd_free(fwd);
}
return flags;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: ipfwd_forward
*
* Description:
* Called by the IP forwarding logic when a packet is received on one
* network device, but must be forwarded on another network device.
*
* Set up to forward the packet on the specified device. This function
* will set up a send event handler that will perform the actual send
* asynchronously and must return without waiting for the send to
* complete.
*
* Input Parameters:
* fwd - An initialized instance of the common forwarding structure that
* includes everything needed to perform the forwarding operation.
*
* Returned Value:
* Zero is returned if the packet was successfully forwarded; A negated
* errno value is returned if the packet is not forwardable. In that
* latter case, the caller should free the IOB list and drop the packet.
*
****************************************************************************/
int ipfwd_forward(FAR struct forward_s *fwd)
{
DEBUGASSERT(fwd != NULL && fwd->f_iob != NULL && fwd->f_dev != NULL);
/* Set up the callback in the connection */
fwd->f_cb = ipfwd_callback_alloc(fwd->f_dev);
if (fwd->f_cb != NULL)
{
fwd->f_cb->flags = (IPFWD_POLL | NETDEV_DOWN);
fwd->f_cb->priv = (FAR void *)fwd;
fwd->f_cb->event = ipfwd_eventhandler;
/* Notify the device driver of the availability of TX data */
netdev_txnotify_dev(fwd->f_dev);
return OK;
}
return -EBUSY;
}
#endif /* CONFIG_NET_IPFORWARD */
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