5fd8f78bf9
1. For buffered tcp/udp case, if CONFIG_NET_ARP_SEND/CONFIG_NET_ARP_IPIN/CONFIG_NET_ICMPv6_NEIGHBOR isn't enabled and the table doesn't contain ip<->ethaddr mapping yet, the logic will skip the realtransmission and then arp/neighbor can't steal the final buffer to generate arp/icmpv6 packet. 2.for all other case, the tcp layer or user program should already contain the retransmit logic, the check is redundancy and may generate many duplicated packets if arp/icmpv6 response is too slow because the cursor stop forward. If user still concern about the very first packet lost, he could fix the issue by enabling CONFIG_NET_ARP_SEND/CONFIG_NET_ICMPv6_NEIGHBOR at begin.
266 lines
8.5 KiB
C
266 lines
8.5 KiB
C
/****************************************************************************
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* net/ipforward/ipfwd_forward.c
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*
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* Copyright (C) 2017 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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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 <net/if.h>
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#include <nuttx/mm/iob.h>
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#include <nuttx/net/net.h>
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#include <nuttx/net/netdev.h>
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#include <nuttx/net/ip.h>
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#include <nuttx/net/netstats.h>
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#include "devif/devif.h"
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#include "netdev/netdev.h"
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#include "arp/arp.h"
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#include "neighbor/neighbor.h"
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#include "ipforward/ipforward.h"
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#ifdef CONFIG_NET_IPFORWARD
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: forward_ipselect
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*
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* Description:
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* If both IPv4 and IPv6 support are enabled, then we will need to select
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* which one to use when generating the outgoing packet. If only one
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* domain is selected, then the setup is already in place and we need do
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* nothing.
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*
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* Input Parameters:
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* fwd - The forwarding state structure
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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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#if defined(CONFIG_NET_IPv4) && defined(CONFIG_NET_IPv6)
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static inline void forward_ipselect(FAR struct forward_s *fwd)
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{
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FAR struct net_driver_s *dev = fwd->f_dev;
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/* Select IPv4 or IPv6 */
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if (fwd->f_domain == PF_INET)
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{
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/* Clear a bit in the d_flags to distinguish this from an IPv6 packet */
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IFF_SET_IPv4(dev->d_flags);
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/* Set the offset to the beginning of the UDP data payload */
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dev->d_appdata = &dev->d_buf[IPv4UDP_HDRLEN + NET_LL_HDRLEN(dev)];
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}
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else
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{
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/* Set a bit in the d_flags to distinguish this from an IPv6 packet */
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IFF_SET_IPv6(dev->d_flags);
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/* Set the offset to the beginning of the UDP data payload */
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dev->d_appdata = &dev->d_buf[IPv6_HDRLEN + NET_LL_HDRLEN(dev)];
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}
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}
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#endif
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/****************************************************************************
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* Name: ipfwd_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
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* event
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* conn An instance of the forwarding structure cast to (void *)
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* pvpriv An instance of struct forward_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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* Modified value of the input flags
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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 ipfwd_eventhandler(FAR struct net_driver_s *dev, FAR void *conn,
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FAR void *pvpriv, uint16_t flags)
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{
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FAR struct forward_s *fwd = (FAR struct forward_s *)pvpriv;
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ninfo("flags: %04x\n", flags);
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DEBUGASSERT(fwd != NULL && fwd->f_iob != NULL && fwd->f_dev != NULL);
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/* Make sure that this is from the forwarding device */
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if (dev == fwd->f_dev)
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{
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/* If the network device has gone down, then we will have terminate
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* the wait now with an error.
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*/
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if ((flags & NETDEV_DOWN) != 0)
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{
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/* Terminate the transfer with an error. */
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nwarn("WARNING: Network is down... Dropping\n");
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ipfwd_dropstats(fwd);
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}
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/* Check if the outgoing packet is available. It may have been claimed
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* by a sendto event handler serving a different thread -OR- if the
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* output buffer currently contains unprocessed incoming data. In
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* these cases we will just have to wait for the next polling cycle.
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*/
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else if (dev->d_sndlen > 0 || (flags & IPFWD_NEWDATA) != 0)
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{
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/* Another thread has beat us sending data or the buffer is busy,
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* Wait for the next polling cycle and check again.
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*/
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return flags;
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}
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/* It looks like we are good to forward the data */
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else
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{
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#if defined(CONFIG_NET_IPv4) && defined(CONFIG_NET_IPv6)
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/* If both IPv4 and IPv6 support are enabled, then we will need to
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* select which one to use when generating the outgoing packet.
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* If only one domain is selected, then the setup is already in
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* place and we need do nothing.
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*/
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forward_ipselect(fwd);
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#endif
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/* Copy the user data into d_appdata and send it. */
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devif_forward(fwd);
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flags &= ~DEVPOLL_MASK;
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}
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/* Free the allocated callback structure */
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fwd->f_cb->flags = 0;
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fwd->f_cb->priv = NULL;
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fwd->f_cb->event = NULL;
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ipfwd_callback_free(dev, fwd->f_cb);
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/* Free any IOBs */
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if (fwd->f_iob != NULL)
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{
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iob_free_chain(fwd->f_iob, IOBUSER_NET_IPFORWARD);
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}
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/* And release the forwarding state structure */
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ipfwd_free(fwd);
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}
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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: ipfwd_forward
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*
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* Description:
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* Called by the IP forwarding logic when a packet is received on one
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* network device, but must be forwarded on another network device.
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*
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* Set up to forward the packet on the specified device. This function
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* will set up a send event handler that will perform the actual send
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* asynchronously and must return without waiting for the send to
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* complete.
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*
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* Input Parameters:
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* fwd - An initialized instance of the common forwarding structure that
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* includes everything needed to perform the forwarding operation.
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*
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* Returned Value:
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* Zero is returned if the packet was successfully forwarded; A negated
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* errno value is returned if the packet is not forwardable. In that
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* latter case, the caller should free the IOB list and drop the packet.
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*
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****************************************************************************/
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int ipfwd_forward(FAR struct forward_s *fwd)
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{
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DEBUGASSERT(fwd != NULL && fwd->f_iob != NULL && fwd->f_dev != NULL);
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/* Set up the callback in the connection */
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fwd->f_cb = ipfwd_callback_alloc(fwd->f_dev);
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if (fwd->f_cb != NULL)
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{
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fwd->f_cb->flags = (IPFWD_POLL | NETDEV_DOWN);
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fwd->f_cb->priv = (FAR void *)fwd;
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fwd->f_cb->event = ipfwd_eventhandler;
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/* Notify the device driver of the availability of TX data */
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netdev_txnotify_dev(fwd->f_dev);
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return OK;
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}
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return -EBUSY;
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}
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#endif /* CONFIG_NET_IPFORWARD */
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