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.
596 lines
17 KiB
C
596 lines
17 KiB
C
/****************************************************************************
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* net/tcp/tcp_sendfile.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 <sys/stat.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <fcntl.h>
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#include <inttypes.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.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 <arch/irq.h>
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#include <nuttx/semaphore.h>
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#include <nuttx/fs/fs.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/arp.h>
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#include <nuttx/net/tcp.h>
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#include "netdev/netdev.h"
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#include "devif/devif.h"
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#include "arp/arp.h"
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#include "icmpv6/icmpv6.h"
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#include "neighbor/neighbor.h"
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#include "socket/socket.h"
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#include "tcp/tcp.h"
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#if defined(CONFIG_NET_SENDFILE) && defined(CONFIG_NET_TCP) && \
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defined(NET_TCP_HAVE_STACK)
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define TCPIPv4BUF ((struct tcp_hdr_s *)&dev->d_buf[NET_LL_HDRLEN(dev) + IPv4_HDRLEN])
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#define TCPIPv6BUF ((struct tcp_hdr_s *)&dev->d_buf[NET_LL_HDRLEN(dev) + IPv6_HDRLEN])
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/* This structure holds the state of the send operation until it can be
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* operated upon from the driver poll event.
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*/
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struct sendfile_s
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{
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FAR struct socket *snd_sock; /* Points to the parent socket structure */
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FAR struct devif_callback_s *snd_cb; /* Reference to callback instance */
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FAR struct file *snd_file; /* File structure of the input file */
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sem_t snd_sem; /* Used to wake up the waiting thread */
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off_t snd_foffset; /* Input file offset */
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size_t snd_flen; /* File length */
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ssize_t snd_sent; /* The number of bytes sent */
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uint32_t snd_isn; /* Initial sequence number */
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uint32_t snd_acked; /* The number of bytes acked */
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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: sendfile_txnotify
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*
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* Description:
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* Notify the appropriate device driver that we are have data ready to
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* be send (TCP)
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*
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* Input Parameters:
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* psock - Socket state structure
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* conn - The TCP connection structure
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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static inline void sendfile_txnotify(FAR struct socket *psock,
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FAR struct tcp_conn_s *conn)
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{
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#ifdef CONFIG_NET_IPv4
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#ifdef CONFIG_NET_IPv6
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/* If both IPv4 and IPv6 support are enabled, then we will need to select
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* the device driver using the appropriate IP domain.
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*/
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if (psock->s_domain == PF_INET)
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#endif
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{
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/* Notify the device driver that send data is available */
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netdev_ipv4_txnotify(conn->u.ipv4.laddr, conn->u.ipv4.raddr);
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}
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#endif /* CONFIG_NET_IPv4 */
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#ifdef CONFIG_NET_IPv6
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#ifdef CONFIG_NET_IPv4
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else /* if (psock->s_domain == PF_INET6) */
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#endif /* CONFIG_NET_IPv4 */
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{
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/* Notify the device driver that send data is available */
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DEBUGASSERT(psock->s_domain == PF_INET6);
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netdev_ipv6_txnotify(conn->u.ipv6.laddr, conn->u.ipv6.raddr);
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}
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#endif /* CONFIG_NET_IPv6 */
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}
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/****************************************************************************
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* Name: sendfile_eventhandler
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*
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* Description:
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* This function is called to perform the actual send operation when
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* 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 caused the event
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* conn The connection structure associated with the socket
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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 sendfile_eventhandler(FAR struct net_driver_s *dev,
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FAR void *pvconn, FAR void *pvpriv,
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uint16_t flags)
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{
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/* FAR struct tcp_conn_s *conn = (FAR struct tcp_conn_s *)pvconn;
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*
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* Do not use pvconn argument to get the TCP connection pointer (the above
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* commented line) because pvconn is normally NULL for some events like
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* NETDEV_DOWN. Instead, the TCP connection pointer can be reliably
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* obtained from the corresponding TCP socket.
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*/
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FAR struct sendfile_s *pstate = (FAR struct sendfile_s *)pvpriv;
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FAR struct socket *psock;
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FAR struct tcp_conn_s *conn;
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int ret;
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DEBUGASSERT(pstate != NULL);
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psock = pstate->snd_sock;
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DEBUGASSERT(psock != NULL);
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/* Get the TCP connection pointer reliably from
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* the corresponding TCP socket.
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*/
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conn = psock->s_conn;
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DEBUGASSERT(conn != NULL);
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/* The TCP socket is connected and, hence, should be bound to a device.
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* Make sure that the polling device is the own that we are bound to.
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*/
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DEBUGASSERT(conn->dev != NULL);
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if (dev != conn->dev)
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{
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return flags;
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}
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ninfo("flags: %04x acked: %" PRId32 " sent: %zd\n",
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flags, pstate->snd_acked, pstate->snd_sent);
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/* Check for a loss of connection */
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if ((flags & TCP_DISCONN_EVENTS) != 0)
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{
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nwarn("WARNING: Lost connection\n");
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/* We could get here recursively through the callback actions of
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* tcp_lost_connection(). So don't repeat that action if we have
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* already been disconnected.
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*/
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if (_SS_ISCONNECTED(psock->s_flags))
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{
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/* Report not connected */
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tcp_lost_connection(psock, pstate->snd_cb, flags);
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}
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/* Report not connected */
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pstate->snd_sent = -ENOTCONN;
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goto end_wait;
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}
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/* If this packet contains an acknowledgement, then update the count of
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* acknowledged bytes.
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*/
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else if ((flags & TCP_ACKDATA) != 0)
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{
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FAR struct tcp_hdr_s *tcp;
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/* Get the offset address of the TCP header */
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#ifdef CONFIG_NET_IPv6
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#ifdef CONFIG_NET_IPv4
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if (IFF_IS_IPv6(dev->d_flags))
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#endif
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{
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DEBUGASSERT(pstate->snd_sock->s_domain == PF_INET6);
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tcp = TCPIPv6BUF;
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}
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#endif /* CONFIG_NET_IPv6 */
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#ifdef CONFIG_NET_IPv4
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#ifdef CONFIG_NET_IPv6
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else
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#endif
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{
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DEBUGASSERT(pstate->snd_sock->s_domain == PF_INET);
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tcp = TCPIPv4BUF;
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}
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#endif /* CONFIG_NET_IPv4 */
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/* The current acknowledgement number number is the (relative) offset
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* of the of the next byte needed by the receiver. The snd_isn is the
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* offset of the first byte to send to the receiver. The difference
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* is the number of bytes to be acknowledged.
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*/
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pstate->snd_acked = TCP_SEQ_SUB(tcp_getsequence(tcp->ackno),
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pstate->snd_isn);
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ninfo("ACK: acked=%" PRId32 " sent=%zd flen=%zu\n",
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pstate->snd_acked, pstate->snd_sent, pstate->snd_flen);
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/* Have all of the bytes in the buffer been sent and acknowledged? */
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if (pstate->snd_acked >= pstate->snd_flen)
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{
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/* Yes. Then pstate->snd_flen should hold the number of bytes
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* actually sent.
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*/
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goto end_wait;
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}
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/* No. Fall through to send more data if necessary */
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}
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/* Check if we are being asked to retransmit data */
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else if ((flags & TCP_REXMIT) != 0)
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{
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nwarn("WARNING: TCP_REXMIT\n");
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/* Yes.. in this case, reset the number of bytes that have been sent
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* to the number of bytes that have been ACKed.
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*/
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pstate->snd_sent = pstate->snd_acked;
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#ifndef CONFIG_NET_TCP_WRITE_BUFFERS
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conn->rexmit_seq = pstate->snd_sent + pstate->snd_isn;
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#endif
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}
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/* We get here if (1) not all of the data has been ACKed, (2) we have been
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* asked to retransmit data, (3) the connection is still healthy, and (4)
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* the outgoing packet is available for our use. In this case, we are
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* now free to send more data to receiver -- UNLESS the buffer contains
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* unprocessing incoming data. In that event, we will have to wait for the
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* next polling cycle.
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*/
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if ((flags & TCP_NEWDATA) == 0 && pstate->snd_sent < pstate->snd_flen)
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{
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/* Get the amount of data that we can send in the next packet */
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uint32_t sndlen = pstate->snd_flen - pstate->snd_sent;
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if (sndlen > conn->mss)
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{
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sndlen = conn->mss;
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}
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/* Check if we have "space" in the window */
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if ((pstate->snd_sent - pstate->snd_acked + sndlen) < conn->snd_wnd)
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{
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uint32_t seqno;
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/* Then set-up to send that amount of data. (this won't actually
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* happen until the polling cycle completes).
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*/
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ret = file_seek(pstate->snd_file,
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pstate->snd_foffset + pstate->snd_sent, SEEK_SET);
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if (ret < 0)
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{
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nerr("ERROR: Failed to lseek: %d\n", ret);
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pstate->snd_sent = ret;
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goto end_wait;
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}
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ret = file_read(pstate->snd_file, dev->d_appdata, sndlen);
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if (ret < 0)
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{
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nerr("ERROR: Failed to read from input file: %d\n", (int)ret);
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pstate->snd_sent = ret;
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goto end_wait;
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}
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dev->d_sndlen = sndlen;
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/* Set the sequence number for this packet. NOTE: The network
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* updates sndseq on recept of ACK *before* this function is
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* called. In that case sndseq will point to the next
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* unacknowledge byte (which might have already been sent). We
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* will overwrite the value of sndseq here before the packet is
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* sent.
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*/
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seqno = pstate->snd_sent + pstate->snd_isn;
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ninfo("SEND: sndseq %08" PRIx32 "->%08" PRIx32 " len: %d\n",
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tcp_getsequence(conn->sndseq), seqno, ret);
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tcp_setsequence(conn->sndseq, seqno);
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/* Notify the device driver of the availability of TX data */
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sendfile_txnotify(psock, conn);
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/* Update the amount of data sent (but not necessarily ACKed) */
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pstate->snd_sent += sndlen;
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ninfo("pid: %d SEND: acked=%" PRId32 " sent=%zd flen=%zu\n",
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getpid(),
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pstate->snd_acked, pstate->snd_sent, pstate->snd_flen);
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}
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else
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{
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nwarn("WARNING: Window full, wait for ack\n");
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}
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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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DEBUGASSERT(pstate->snd_cb != NULL);
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pstate->snd_cb->flags = 0;
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pstate->snd_cb->priv = NULL;
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pstate->snd_cb->event = NULL;
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/* There are no outstanding, unacknowledged bytes */
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conn->tx_unacked = 0;
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/* Wake up the waiting thread */
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nxsem_post(&pstate->snd_sem);
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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: tcp_sendfile
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*
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* Description:
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* The tcp_sendfile() call may be used only when the INET socket is in a
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* connected state (so that the intended recipient is known).
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*
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* Input Parameters:
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* psock An instance of the internal socket structure.
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* buf Data to send
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* len Length of data to send
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* flags Send flags
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*
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* Returned Value:
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* On success, returns the number of characters sent. On error,
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* a negated errno value is returned. See sendfile() for a list
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* appropriate error return values.
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*
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****************************************************************************/
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ssize_t tcp_sendfile(FAR struct socket *psock, FAR struct file *infile,
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FAR off_t *offset, size_t count)
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{
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FAR struct tcp_conn_s *conn;
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struct sendfile_s state;
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off_t startpos;
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int ret;
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/* If this is an un-connected socket, then return ENOTCONN */
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if (psock->s_type != SOCK_STREAM || !_SS_ISCONNECTED(psock->s_flags))
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{
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nerr("ERROR: Not connected\n");
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return -ENOTCONN;
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}
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/* Make sure that we have the IP address mapping */
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conn = (FAR struct tcp_conn_s *)psock->s_conn;
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DEBUGASSERT(conn != NULL);
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#if defined(CONFIG_NET_ARP_SEND) || defined(CONFIG_NET_ICMPv6_NEIGHBOR)
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#ifdef CONFIG_NET_ARP_SEND
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#ifdef CONFIG_NET_ICMPv6_NEIGHBOR
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if (psock->s_domain == PF_INET)
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#endif
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{
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/* Make sure that the IP address mapping is in the ARP table */
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ret = arp_send(conn->u.ipv4.raddr);
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}
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#endif /* CONFIG_NET_ARP_SEND */
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#ifdef CONFIG_NET_ICMPv6_NEIGHBOR
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#ifdef CONFIG_NET_ARP_SEND
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else
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#endif
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{
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/* Make sure that the IP address mapping is in the Neighbor Table */
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ret = icmpv6_neighbor(conn->u.ipv6.raddr);
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}
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#endif /* CONFIG_NET_ICMPv6_NEIGHBOR */
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|
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/* Did we successfully get the address mapping? */
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|
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if (ret < 0)
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{
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nerr("ERROR: Not reachable\n");
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return -ENETUNREACH;
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}
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#endif /* CONFIG_NET_ARP_SEND || CONFIG_NET_ICMPv6_NEIGHBOR */
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/* Get the current file position. */
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startpos = file_seek(infile, 0, SEEK_CUR);
|
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if (startpos < 0)
|
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{
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return startpos;
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}
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|
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/* Initialize the state structure. This is done with the network
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* locked because we don't want anything to happen until we are
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* ready.
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*/
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net_lock();
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#ifdef CONFIG_NET_TCP_WRITE_BUFFERS
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conn->sendfile = true;
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#endif
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memset(&state, 0, sizeof(struct sendfile_s));
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|
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/* This semaphore is used for signaling and, hence, should not have
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* priority inheritance enabled.
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*/
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nxsem_init(&state.snd_sem, 0, 0); /* Doesn't really fail */
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nxsem_set_protocol(&state.snd_sem, SEM_PRIO_NONE);
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state.snd_sock = psock; /* Socket descriptor to use */
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state.snd_foffset = offset ? *offset : startpos; /* Input file offset */
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state.snd_flen = count; /* Number of bytes to send */
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state.snd_file = infile; /* File to read from */
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/* Allocate resources to receive a callback */
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state.snd_cb = tcp_callback_alloc(conn);
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|
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if (state.snd_cb == NULL)
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{
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nerr("ERROR: Failed to allocate callback\n");
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ret = -ENOMEM;
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goto errout_locked;
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}
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|
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/* Get the initial sequence number that will be used */
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state.snd_isn = tcp_getsequence(conn->sndseq);
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/* There is no outstanding, unacknowledged data after this
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* initial sequence number.
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*/
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conn->tx_unacked = 0;
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/* Set up the callback in the connection */
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state.snd_cb->flags = (TCP_ACKDATA | TCP_REXMIT | TCP_POLL |
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TCP_DISCONN_EVENTS);
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state.snd_cb->priv = (FAR void *)&state;
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state.snd_cb->event = sendfile_eventhandler;
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/* Notify the device driver of the availability of TX data */
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sendfile_txnotify(psock, conn);
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for (; ; )
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{
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uint32_t acked = state.snd_acked;
|
|
|
|
ret = net_timedwait_uninterruptible(&state.snd_sem,
|
|
_SO_TIMEOUT(psock->s_sndtimeo));
|
|
if (ret != -ETIMEDOUT || acked == state.snd_acked)
|
|
{
|
|
break; /* Successful completion or timeout without any progress */
|
|
}
|
|
}
|
|
|
|
tcp_callback_free(conn, state.snd_cb);
|
|
|
|
errout_locked:
|
|
nxsem_destroy(&state.snd_sem);
|
|
#ifdef CONFIG_NET_TCP_WRITE_BUFFERS
|
|
conn->sendfile = false;
|
|
#endif
|
|
net_unlock();
|
|
|
|
/* Return the current file position */
|
|
|
|
if (offset)
|
|
{
|
|
/* Use lseek to get the current file position */
|
|
|
|
off_t curpos = file_seek(infile, 0, SEEK_CUR);
|
|
if (curpos < 0)
|
|
{
|
|
return curpos;
|
|
}
|
|
|
|
/* Return the current file position */
|
|
|
|
*offset = curpos;
|
|
|
|
/* Use lseek again to restore the original file position */
|
|
|
|
startpos = file_seek(infile, startpos, SEEK_SET);
|
|
if (startpos < 0)
|
|
{
|
|
return startpos;
|
|
}
|
|
}
|
|
|
|
if (ret < 0)
|
|
{
|
|
return ret;
|
|
}
|
|
else
|
|
{
|
|
return state.snd_sent;
|
|
}
|
|
}
|
|
|
|
#endif /* CONFIG_NET_SENDFILE && CONFIG_NET_TCP && NET_TCP_HAVE_STACK */
|