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- /****************************************************************************
- * net/tcp/tcp_sendfile.c
- *
- * Copyright (C) 2013 UVC Ingenieure. All rights reserved.
- * Copyright (C) 2007-2017 Gregory Nutt. All rights reserved.
- * Authors: Gregory Nutt <gnutt@nuttx.org>
- * Max Holtzberg <mh@uvc.de>
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- * 3. Neither the name NuttX nor the names of its contributors may be
- * used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
- * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- *
- ****************************************************************************/
- /****************************************************************************
- * Included Files
- ****************************************************************************/
- #include <nuttx/config.h>
- #include <sys/stat.h>
- #include <sys/types.h>
- #include <sys/socket.h>
- #include <fcntl.h>
- #include <stdint.h>
- #include <stdbool.h>
- #include <stdlib.h>
- #include <string.h>
- #include <unistd.h>
- #include <errno.h>
- #include <debug.h>
- #include <arch/irq.h>
- #include <nuttx/clock.h>
- #include <nuttx/semaphore.h>
- #include <nuttx/fs/fs.h>
- #include <nuttx/net/net.h>
- #include <nuttx/net/netdev.h>
- #include <nuttx/net/arp.h>
- #include <nuttx/net/tcp.h>
- #include "netdev/netdev.h"
- #include "devif/devif.h"
- #include "arp/arp.h"
- #include "icmpv6/icmpv6.h"
- #include "neighbor/neighbor.h"
- #include "socket/socket.h"
- #include "tcp/tcp.h"
- #if defined(CONFIG_NET_SENDFILE) && defined(CONFIG_NET_TCP) && \
- defined(NET_TCP_HAVE_STACK)
- /****************************************************************************
- * Pre-processor Definitions
- ****************************************************************************/
- #if defined(CONFIG_NET_TCP_SPLIT) && !defined(CONFIG_NET_TCP_SPLIT_SIZE)
- # define CONFIG_NET_TCP_SPLIT_SIZE 40
- #endif
- #define TCPIPv4BUF ((struct tcp_hdr_s *)&dev->d_buf[NET_LL_HDRLEN(dev) + IPv4_HDRLEN])
- #define TCPIPv6BUF ((struct tcp_hdr_s *)&dev->d_buf[NET_LL_HDRLEN(dev) + IPv6_HDRLEN])
- /****************************************************************************
- * Private Types
- ****************************************************************************/
- /* This structure holds the state of the send operation until it can be
- * operated upon from the driver poll event.
- */
- struct sendfile_s
- {
- FAR struct socket *snd_sock; /* Points to the parent socket structure */
- FAR struct devif_callback_s *snd_datacb; /* Data callback */
- FAR struct devif_callback_s *snd_ackcb; /* ACK callback */
- FAR struct file *snd_file; /* File structure of the input file */
- sem_t snd_sem; /* Used to wake up the waiting thread */
- off_t snd_foffset; /* Input file offset */
- size_t snd_flen; /* File length */
- ssize_t snd_sent; /* The number of bytes sent */
- uint32_t snd_isn; /* Initial sequence number */
- uint32_t snd_acked; /* The number of bytes acked */
- #ifdef CONFIG_NET_SOCKOPTS
- clock_t snd_time; /* Last send time for determining timeout */
- #endif
- };
- /****************************************************************************
- * Private Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: sendfile_timeout
- *
- * Description:
- * Check for send timeout.
- *
- * Input Parameters:
- * pstate - send state structure
- *
- * Returned Value:
- * TRUE:timeout FALSE:no timeout
- *
- * Assumptions:
- * The network is locked
- *
- ****************************************************************************/
- #ifdef CONFIG_NET_SOCKOPTS
- static inline int sendfile_timeout(FAR struct sendfile_s *pstate)
- {
- FAR struct socket *psock = 0;
- /* Check for a timeout configured via setsockopts(SO_SNDTIMEO).
- * If none... we well let the send wait forever.
- */
- psock = pstate->snd_sock;
- if (psock && psock->s_sndtimeo != 0)
- {
- /* Check if the configured timeout has elapsed */
- return net_timeo(pstate->snd_time, psock->s_sndtimeo);
- }
- /* No timeout */
- return FALSE;
- }
- #endif /* CONFIG_NET_SOCKOPTS */
- static uint16_t ack_eventhandler(FAR struct net_driver_s *dev,
- FAR void *pvconn,
- FAR void *pvpriv, uint16_t flags)
- {
- FAR struct sendfile_s *pstate = (FAR struct sendfile_s *)pvpriv;
- ninfo("flags: %04x\n", flags);
- if ((flags & TCP_ACKDATA) != 0)
- {
- FAR struct tcp_hdr_s *tcp;
- #ifdef CONFIG_NET_SOCKOPTS
- /* Update the timeout */
- pstate->snd_time = clock_systimer();
- #endif
- /* Get the offset address of the TCP header */
- #ifdef CONFIG_NET_IPv6
- #ifdef CONFIG_NET_IPv4
- if (IFF_IS_IPv6(dev->d_flags))
- #endif
- {
- DEBUGASSERT(pstate->snd_sock == PF_INET6);
- tcp = TCPIPv6BUF;
- }
- #endif /* CONFIG_NET_IPv6 */
- #ifdef CONFIG_NET_IPv4
- #ifdef CONFIG_NET_IPv6
- else
- #endif
- {
- DEBUGASSERT(pstate->snd_sock == PF_INET);
- tcp = TCPIPv4BUF;
- }
- #endif /* CONFIG_NET_IPv4 */
- /* The current acknowledgement number number is the (relative) offset
- * of the of the next byte needed by the receiver. The snd_isn is the
- * offset of the first byte to send to the receiver. The difference
- * is the number of bytes to be acknowledged.
- */
- pstate->snd_acked = tcp_getsequence(tcp->ackno) - pstate->snd_isn;
- ninfo("ACK: acked=%d sent=%d flen=%d\n",
- pstate->snd_acked, pstate->snd_sent, pstate->snd_flen);
- dev->d_sndlen = 0;
- flags &= ~TCP_ACKDATA;
- }
- else if ((flags & TCP_REXMIT) != 0)
- {
- nwarn("WARNING: TCP_REXMIT\n");
- /* Yes.. in this case, reset the number of bytes that have been sent
- * to the number of bytes that have been ACKed.
- */
- pstate->snd_sent = pstate->snd_acked;
- }
- /* Check for a loss of connection */
- else if ((flags & TCP_DISCONN_EVENTS) != 0)
- {
- FAR struct socket *psock = pstate->snd_sock;
- nwarn("WARNING: Lost connection\n");
- /* We could get here recursively through the callback actions of
- * tcp_lost_connection(). So don't repeat that action if we have
- * already been disconnected.
- */
- DEBUGASSERT(psock != NULL);
- if (_SS_ISCONNECTED(psock->s_flags))
- {
- /* Report not connected */
- tcp_lost_connection(psock, pstate->snd_ackcb, flags);
- }
- /* Report not connected */
- pstate->snd_sent = -ENOTCONN;
- }
- /* Prohibit further callbacks */
- pstate->snd_ackcb->flags = 0;
- pstate->snd_ackcb->priv = NULL;
- pstate->snd_ackcb->event = NULL;
- /* Wake up the waiting thread */
- nxsem_post(&pstate->snd_sem);
- return flags;
- }
- /****************************************************************************
- * Name: sendfile_addrcheck
- *
- * Description:
- * Check if the destination IP address is in the IPv4 ARP or IPv6 Neighbor
- * tables. If not, then the send won't actually make it out... it will be
- * replaced with an ARP request (IPv4) or a Neighbor Solicitation (IPv6).
- *
- * NOTE 1: This could be an expensive check if there are a lot of
- * entries in the ARP or Neighbor tables.
- *
- * NOTE 2: If we are actually harvesting IP addresses on incoming IP
- * packets, then this check should not be necessary; the MAC mapping
- * should already be in the ARP table in many cases (IPv4 only).
- *
- * NOTE 3: If CONFIG_NET_ARP_SEND then we can be assured that the IP
- * address mapping is already in the ARP table.
- *
- * Input Parameters:
- * conn - The TCP connection structure
- *
- * Returned Value:
- * None
- *
- * Assumptions:
- * The network is locked
- *
- ****************************************************************************/
- #ifdef CONFIG_NET_ETHERNET
- static inline bool sendfile_addrcheck(FAR struct tcp_conn_s *conn)
- {
- #ifdef CONFIG_NET_IPv4
- #ifdef CONFIG_NET_IPv6
- if (conn->domain == PF_INET)
- #endif
- {
- #if !defined(CONFIG_NET_ARP_IPIN) && !defined(CONFIG_NET_ARP_SEND)
- return (arp_find(conn->u.ipv4.raddr, NULL) >= 0);
- #else
- return true;
- #endif
- }
- #endif /* CONFIG_NET_IPv4 */
- #ifdef CONFIG_NET_IPv6
- #ifdef CONFIG_NET_IPv4
- else
- #endif
- {
- #if !defined(CONFIG_NET_ICMPv6_NEIGHBOR)
- return (neighbor_lookup(conn->u.ipv6.raddr, NULL) >= 0);
- #else
- return true;
- #endif
- }
- #endif /* CONFIG_NET_IPv6 */
- }
- #else /* CONFIG_NET_ETHERNET */
- # sendfile_addrcheck(r) (true)
- #endif /* CONFIG_NET_ETHERNET */
- /****************************************************************************
- * Name: sendfile_eventhandler
- *
- * Description:
- * This function is called to perform the actual send operation when
- * polled by the lower, device interfacing layer.
- *
- * Input Parameters:
- * dev The structure of the network driver that caused the event
- * conn The connection structure associated with the socket
- * flags Set of events describing why the callback was invoked
- *
- * Returned Value:
- * None
- *
- * Assumptions:
- * The network is locked
- *
- ****************************************************************************/
- static uint16_t sendfile_eventhandler(FAR struct net_driver_s *dev,
- FAR void *pvconn, FAR void *pvpriv,
- uint16_t flags)
- {
- FAR struct tcp_conn_s *conn = (FAR struct tcp_conn_s *)pvconn;
- FAR struct sendfile_s *pstate = (FAR struct sendfile_s *)pvpriv;
- int ret;
- /* The TCP socket is connected and, hence, should be bound to a device.
- * Make sure that the polling device is the own that we are bound to.
- */
- DEBUGASSERT(conn->dev != NULL);
- if (dev != conn->dev)
- {
- return flags;
- }
- ninfo("flags: %04x acked: %d sent: %d\n",
- flags, pstate->snd_acked, pstate->snd_sent);
- /* Check for a loss of connection */
- if ((flags & TCP_DISCONN_EVENTS) != 0)
- {
- FAR struct socket *psock = pstate->snd_sock;
- nwarn("WARNING: Lost connection\n");
- /* We could get here recursively through the callback actions of
- * tcp_lost_connection(). So don't repeat that action if we have
- * already been disconnected.
- */
- DEBUGASSERT(psock != NULL);
- if (_SS_ISCONNECTED(psock->s_flags))
- {
- /* Report not connected */
- tcp_lost_connection(psock, pstate->snd_datacb, flags);
- }
- /* Report not connected */
- pstate->snd_sent = -ENOTCONN;
- goto end_wait;
- }
- /* We get here if (1) not all of the data has been ACKed, (2) we have been
- * asked to retransmit data, (3) the connection is still healthy, and (4)
- * the outgoing packet is available for our use. In this case, we are
- * now free to send more data to receiver -- UNLESS the buffer contains
- * unprocessing incoming data. In that event, we will have to wait for the
- * next polling cycle.
- */
- if ((flags & TCP_NEWDATA) == 0 && pstate->snd_sent < pstate->snd_flen)
- {
- /* Get the amount of data that we can send in the next packet */
- uint32_t sndlen = pstate->snd_flen - pstate->snd_sent;
- if (sndlen > conn->mss)
- {
- sndlen = conn->mss;
- }
- /* Check if we have "space" in the window */
- if ((pstate->snd_sent - pstate->snd_acked + sndlen) < conn->winsize)
- {
- uint32_t seqno;
- /* Then set-up to send that amount of data. (this won't actually
- * happen until the polling cycle completes).
- */
- ret = file_seek(pstate->snd_file,
- pstate->snd_foffset + pstate->snd_sent, SEEK_SET);
- if (ret < 0)
- {
- nerr("ERROR: Failed to lseek: %d\n", ret);
- pstate->snd_sent = ret;
- goto end_wait;
- }
- ret = file_read(pstate->snd_file, dev->d_appdata, sndlen);
- if (ret < 0)
- {
- nerr("ERROR: Failed to read from input file: %d\n", (int)ret);
- pstate->snd_sent = ret;
- goto end_wait;
- }
- dev->d_sndlen = sndlen;
- /* Set the sequence number for this packet. NOTE: The network
- * updates sndseq on recept of ACK *before* this function is
- * called. In that case sndseq will point to the next
- * unacknowledge byte (which might have already been sent). We
- * will overwrite the value of sndseq here before the packet is
- * sent.
- */
- seqno = pstate->snd_sent + pstate->snd_isn;
- ninfo("SEND: sndseq %08x->%08x len: %d\n",
- conn->sndseq, seqno, ret);
- tcp_setsequence(conn->sndseq, seqno);
- /* Check if the destination IP address is in the ARP or Neighbor
- * table. If not, then the send won't actually make it out... it
- * will be replaced with an ARP request or Neighbor Solicitation.
- */
- if (pstate->snd_sent != 0 || sendfile_addrcheck(conn))
- {
- /* Update the amount of data sent (but not necessarily ACKed) */
- pstate->snd_sent += sndlen;
- ninfo("pid: %d SEND: acked=%d sent=%d flen=%d\n", getpid(),
- pstate->snd_acked, pstate->snd_sent, pstate->snd_flen);
- }
- }
- else
- {
- nwarn("WARNING: Window full, wait for ack\n");
- goto wait;
- }
- }
- #ifdef CONFIG_NET_SOCKOPTS
- /* All data has been send and we are just waiting for ACK or re-transmit
- * indications to complete the send. Check for a timeout.
- */
- if (sendfile_timeout(pstate))
- {
- /* Yes.. report the timeout */
- nwarn("WARNING: SEND timeout\n");
- pstate->snd_sent = -ETIMEDOUT;
- goto end_wait;
- }
- #endif /* CONFIG_NET_SOCKOPTS */
- if (pstate->snd_sent >= pstate->snd_flen
- && pstate->snd_acked < pstate->snd_flen)
- {
- /* All data has been sent, but there are outstanding ACK's */
- goto wait;
- }
- end_wait:
- /* Do not allow any further callbacks */
- pstate->snd_datacb->flags = 0;
- pstate->snd_datacb->priv = NULL;
- pstate->snd_datacb->event = NULL;
- /* Wake up the waiting thread */
- nxsem_post(&pstate->snd_sem);
- wait:
- return flags;
- }
- /****************************************************************************
- * Name: sendfile_txnotify
- *
- * Description:
- * Notify the appropriate device driver that we are have data ready to
- * be send (TCP)
- *
- * Input Parameters:
- * psock - Socket state structure
- * conn - The TCP connection structure
- *
- * Returned Value:
- * None
- *
- ****************************************************************************/
- static inline void sendfile_txnotify(FAR struct socket *psock,
- FAR struct tcp_conn_s *conn)
- {
- #ifdef CONFIG_NET_IPv4
- #ifdef CONFIG_NET_IPv6
- /* If both IPv4 and IPv6 support are enabled, then we will need to select
- * the device driver using the appropriate IP domain.
- */
- if (psock->s_domain == PF_INET)
- #endif
- {
- /* Notify the device driver that send data is available */
- netdev_ipv4_txnotify(conn->u.ipv4.laddr, conn->u.ipv4.raddr);
- }
- #endif /* CONFIG_NET_IPv4 */
- #ifdef CONFIG_NET_IPv6
- #ifdef CONFIG_NET_IPv4
- else /* if (psock->s_domain == PF_INET6) */
- #endif /* CONFIG_NET_IPv4 */
- {
- /* Notify the device driver that send data is available */
- DEBUGASSERT(psock->s_domain == PF_INET6);
- netdev_ipv6_txnotify(conn->u.ipv6.laddr, conn->u.ipv6.raddr);
- }
- #endif /* CONFIG_NET_IPv6 */
- }
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: tcp_sendfile
- *
- * Description:
- * The tcp_sendfile() call may be used only when the INET socket is in a
- * connected state (so that the intended recipient is known).
- *
- * Input Parameters:
- * psock An instance of the internal socket structure.
- * buf Data to send
- * len Length of data to send
- * flags Send flags
- *
- * Returned Value:
- * On success, returns the number of characters sent. On error,
- * a negated errno value is returned. See sendfile() for a list
- * appropriate error return values.
- *
- ****************************************************************************/
- ssize_t tcp_sendfile(FAR struct socket *psock, FAR struct file *infile,
- FAR off_t *offset, size_t count)
- {
- FAR struct tcp_conn_s *conn;
- struct sendfile_s state;
- int ret;
- /* If this is an un-connected socket, then return ENOTCONN */
- if (psock->s_type != SOCK_STREAM || !_SS_ISCONNECTED(psock->s_flags))
- {
- nerr("ERROR: Not connected\n");
- return -ENOTCONN;
- }
- /* Make sure that we have the IP address mapping */
- conn = (FAR struct tcp_conn_s *)psock->s_conn;
- DEBUGASSERT(conn != NULL);
- #if defined(CONFIG_NET_ARP_SEND) || defined(CONFIG_NET_ICMPv6_NEIGHBOR)
- #ifdef CONFIG_NET_ARP_SEND
- #ifdef CONFIG_NET_ICMPv6_NEIGHBOR
- if (psock->s_domain == PF_INET)
- #endif
- {
- /* Make sure that the IP address mapping is in the ARP table */
- ret = arp_send(conn->u.ipv4.raddr);
- }
- #endif /* CONFIG_NET_ARP_SEND */
- #ifdef CONFIG_NET_ICMPv6_NEIGHBOR
- #ifdef CONFIG_NET_ARP_SEND
- else
- #endif
- {
- /* Make sure that the IP address mapping is in the Neighbor Table */
- ret = icmpv6_neighbor(conn->u.ipv6.raddr);
- }
- #endif /* CONFIG_NET_ICMPv6_NEIGHBOR */
- /* Did we successfully get the address mapping? */
- if (ret < 0)
- {
- nerr("ERROR: Not reachable\n");
- return -ENETUNREACH;
- }
- #endif /* CONFIG_NET_ARP_SEND || CONFIG_NET_ICMPv6_NEIGHBOR */
- /* Set the socket state to sending */
- psock->s_flags = _SS_SETSTATE(psock->s_flags, _SF_SEND);
- /* Initialize the state structure. This is done with the network
- * locked because we don't want anything to happen until we are
- * ready.
- */
- net_lock();
- memset(&state, 0, sizeof(struct sendfile_s));
- /* This semaphore is used for signaling and, hence, should not have
- * priority inheritance enabled.
- */
- nxsem_init(&state.snd_sem, 0, 0); /* Doesn't really fail */
- nxsem_setprotocol(&state.snd_sem, SEM_PRIO_NONE);
- state.snd_sock = psock; /* Socket descriptor to use */
- state.snd_foffset = offset ? *offset : 0; /* Input file offset */
- state.snd_flen = count; /* Number of bytes to send */
- state.snd_file = infile; /* File to read from */
- /* Allocate resources to receive a callback */
- state.snd_datacb = tcp_callback_alloc(conn);
- if (state.snd_datacb == NULL)
- {
- nerr("ERROR: Failed to allocate data callback\n");
- ret = -ENOMEM;
- goto errout_locked;
- }
- state.snd_ackcb = tcp_callback_alloc(conn);
- if (state.snd_ackcb == NULL)
- {
- nerr("ERROR: Failed to allocate ack callback\n");
- ret = -ENOMEM;
- goto errout_datacb;
- }
- /* Get the initial sequence number that will be used */
- state.snd_isn = tcp_getsequence(conn->sndseq);
- /* There is no outstanding, unacknowledged data after this
- * initial sequence number.
- */
- conn->unacked = 0;
- #ifdef CONFIG_NET_SOCKOPTS
- /* Set the initial time for calculating timeouts */
- state.snd_time = clock_systimer();
- #endif
- /* Set up the ACK callback in the connection */
- state.snd_ackcb->flags = (TCP_ACKDATA | TCP_REXMIT | TCP_DISCONN_EVENTS);
- state.snd_ackcb->priv = (FAR void *)&state;
- state.snd_ackcb->event = ack_eventhandler;
- /* Perform the TCP send operation */
- do
- {
- state.snd_datacb->flags = TCP_POLL;
- state.snd_datacb->priv = (FAR void *)&state;
- state.snd_datacb->event = sendfile_eventhandler;
- /* Notify the device driver of the availability of TX data */
- sendfile_txnotify(psock, conn);
- net_lockedwait(&state.snd_sem);
- }
- while (state.snd_sent >= 0 && state.snd_acked < state.snd_flen);
- /* Set the socket state to idle */
- psock->s_flags = _SS_SETSTATE(psock->s_flags, _SF_IDLE);
- tcp_callback_free(conn, state.snd_ackcb);
- errout_datacb:
- tcp_callback_free(conn, state.snd_datacb);
- errout_locked:
- nxsem_destroy(&state. snd_sem);
- net_unlock();
- if (ret < 0)
- {
- return ret;
- }
- else
- {
- return state.snd_sent;
- }
- }
- #endif /* CONFIG_NET_SENDFILE && CONFIG_NET_TCP && NET_TCP_HAVE_STACK */
|