/**************************************************************************** * net/socket/net_sendfile.c * * Copyright (C) 2013 UVC Ingenieure. All rights reserved. * Copyright (C) 2007-2014 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 #if defined(CONFIG_NET) && defined(CONFIG_NET_TCP) #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 "tcp/tcp.h" #include "socket/socket.h" /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ #if defined(CONFIG_NET_TCP_SPLIT) && !defined(CONFIG_NET_TCP_SPLIT_SIZE) # define CONFIG_NET_TCP_SPLIT_SIZE 40 #endif #define TCPBUF ((struct tcp_iphdr_s *)&dev->d_buf[NET_LL_HDRLEN(dev)]) /**************************************************************************** * Private Types ****************************************************************************/ /* This structure holds the state of the send operation until it can be * operated upon from the interrupt level. */ 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 uint32_t snd_time; /* Last send time for determining timeout */ #endif }; /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Function: sendfile_timeout * * Description: * Check for send timeout. * * Parameters: * pstate send state structure * * Returned Value: * TRUE:timeout FALSE:no timeout * * Assumptions: * Running at the interrupt level * ****************************************************************************/ #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_interrupt(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; nllvdbg("flags: %04x\n", flags); if ((flags & TCP_ACKDATA) != 0) { #ifdef CONFIG_NET_SOCKOPTS /* Update the timeout */ pstate->snd_time = clock_systimer(); #endif /* 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(TCPBUF->ackno) - pstate->snd_isn; nllvdbg("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) { nlldbg("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_CLOSE | TCP_ABORT | TCP_TIMEDOUT)) != 0) { /* Report not connected */ nlldbg("Lost connection\n"); net_lostconnection(pstate->snd_sock, flags); pstate->snd_sent = -ENOTCONN; } /* Wake up the waiting thread */ sem_post(&pstate->snd_sem); return flags; } /**************************************************************************** * Function: sendfile_interrupt * * Description: * This function is called from the interrupt level to perform the actual * send operation when polled by the lower, device interfacing layer. * * Parameters: * dev The structure of the network driver that caused the interrupt * conn The connection structure associated with the socket * flags Set of events describing why the callback was invoked * * Returned Value: * None * * Assumptions: * Running at the interrupt level * ****************************************************************************/ static uint16_t sendfile_interrupt(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; nllvdbg("flags: %04x acked: %d sent: %d\n", flags, pstate->snd_acked, pstate->snd_sent); /* Check for a loss of connection */ if ((flags & (TCP_CLOSE | TCP_ABORT | TCP_TIMEDOUT)) != 0) { /* Report not connected */ nlldbg("Lost connection\n"); net_lostconnection(pstate->snd_sock, flags); 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 > tcp_mss(conn)) { sndlen = tcp_mss(conn); } /* 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) { int errcode = errno; nlldbg("failed to lseek: %d\n", errcode); pstate->snd_sent = -errcode; goto end_wait; } ret = file_read(pstate->snd_file, dev->d_appdata, sndlen); if (ret < 0) { int errcode = errno; nlldbg("failed to read from input file: %d\n", errcode); pstate->snd_sent = -errcode; goto end_wait; } dev->d_sndlen = sndlen; /* Set the sequence number for this packet. NOTE: uIP 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; nllvdbg("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 table. If not, * then the send won't actually make it out... it will be replaced with * an ARP request. * * NOTE 1: This could be an expensive check if there are a lot of entries * in the ARP table. Hence, we only check on the first packet -- when * snd_sent is zero. * * 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. * * NOTE 3: If CONFIG_NET_ARP_SEND then we can be assured that the IP * address mapping is already in the ARP table. */ #if defined(CONFIG_NET_ETHERNET) && !defined(CONFIG_NET_ARP_IPIN) && \ !defined(CONFIG_NET_ARP_SEND) if (pstate->snd_sent != 0 || arp_find(conn->u.ipv4.raddr) != NULL) #endif { /* Update the amount of data sent (but not necessarily ACKed) */ pstate->snd_sent += sndlen; nllvdbg("pid: %d SEND: acked=%d sent=%d flen=%d\n", getpid(), pstate->snd_acked, pstate->snd_sent, pstate->snd_flen); } } else { nlldbg("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 */ nlldbg("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 */ sem_post(&pstate->snd_sem); wait: return flags; } /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Function: net_sendfile * * Description: * The send() call may be used only when the socket is in a connected state * (so that the intended recipient is known). The only difference between * send() and write() is the presence of flags. With zero flags parameter, * send() is equivalent to write(). Also, send(sockfd,buf,len,flags) is * equivalent to sendto(sockfd,buf,len,flags,NULL,0). * * 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, * -1 is returned, and errno is set appropriately: * * EAGAIN or EWOULDBLOCK * The socket is marked non-blocking and the requested operation * would block. * EBADF * An invalid descriptor was specified. * ECONNRESET * Connection reset by peer. * EDESTADDRREQ * The socket is not connection-mode, and no peer address is set. * EFAULT * An invalid user space address was specified for a parameter. * EINTR * A signal occurred before any data was transmitted. * EINVAL * Invalid argument passed. * EISCONN * The connection-mode socket was connected already but a recipient * was specified. (Now either this error is returned, or the recipient * specification is ignored.) * EMSGSIZE * The socket type requires that message be sent atomically, and the * size of the message to be sent made this impossible. * ENOBUFS * The output queue for a network interface was full. This generally * indicates that the interface has stopped sending, but may be * caused by transient congestion. * ENOMEM * No memory available. * ENOTCONN * The socket is not connected, and no target has been given. * ENOTSOCK * The argument s is not a socket. * EOPNOTSUPP * Some bit in the flags argument is inappropriate for the socket * type. * EPIPE * The local end has been shut down on a connection oriented socket. * In this case the process will also receive a SIGPIPE unless * MSG_NOSIGNAL is set. * * Assumptions: * ****************************************************************************/ ssize_t net_sendfile(int outfd, struct file *infile, off_t *offset, size_t count) { FAR struct socket *psock = sockfd_socket(outfd); FAR struct tcp_conn_s *conn = (FAR struct tcp_conn_s*)psock->s_conn; struct sendfile_s state; net_lock_t save; int err; /* Verify that the sockfd corresponds to valid, allocated socket */ if (!psock || psock->s_crefs <= 0) { ndbg("ERROR: Invalid socket\n"); err = EBADF; goto errout; } /* If this is an un-connected socket, then return ENOTCONN */ if (psock->s_type != SOCK_STREAM || !_SS_ISCONNECTED(psock->s_flags)) { ndbg("ERROR: Not connected\n"); err = ENOTCONN; goto errout; } /* Make sure that the IP address mapping is in the ARP table */ #ifdef CONFIG_NET_ARP_SEND ret = arp_send(conn->u.ipv4.raddr); if (ret < 0) { ndbg("ERROR: Not reachable\n"); err = ENETUNREACH; goto errout; } #endif /* Set the socket state to sending */ psock->s_flags = _SS_SETSTATE(psock->s_flags, _SF_SEND); /* Initialize the state structure. This is done with interrupts * disabled because we don't want anything to happen until we * are ready. */ save = net_lock(); memset(&state, 0, sizeof(struct sendfile_s)); sem_init(&state. snd_sem, 0, 0); /* Doesn't really fail */ 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) { nlldbg("Failed to allocate data callback\n"); err = ENOMEM; goto errout_locked; } state.snd_ackcb = tcp_callback_alloc(conn); if (state.snd_ackcb == NULL) { nlldbg("Failed to allocate ack callback\n"); err = 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_CLOSE | TCP_ABORT | TCP_TIMEDOUT); state.snd_ackcb->priv = (void*)&state; state.snd_ackcb->event = ack_interrupt; /* Perform the TCP send operation */ do { state.snd_datacb->flags = TCP_POLL; state.snd_datacb->priv = (void*)&state; state.snd_datacb->event = sendfile_interrupt; /* Notify the device driver of the availability of TX data */ #ifdef CONFIG_NET_MULTILINK netdev_ipv4_txnotify(conn->u.ipv4.laddr, conn->u.ipv4.raddr); #else netdev_ipv4_txnotify(conn->u.ipv4.raddr); #endif 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: sem_destroy(&state. snd_sem); net_unlock(save); errout: if (err) { set_errno(err); return ERROR; } else if (state.snd_sent < 0) { set_errno(-state.snd_sent); return ERROR; } else { return state.snd_sent; } } #endif /* CONFIG_NET && CONFIG_NET_TCP */