/**************************************************************************** * 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 * Max Holtzberg * * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #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 */ }; /**************************************************************************** * Private Functions ****************************************************************************/ 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; /* 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->s_domain == PF_INET6); tcp = TCPIPv6BUF; } #endif /* CONFIG_NET_IPv6 */ #ifdef CONFIG_NET_IPv4 #ifdef CONFIG_NET_IPv6 else #endif { DEBUGASSERT(pstate->snd_sock->s_domain == 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_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); /* 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; } } 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 */ /* 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_set_protocol(&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->tx_unacked = 0; /* 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 */ 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); for (; ; ) { 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; /* Timeout without any progress */ } } 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 */