diff options
Diffstat (limited to 'nuttx/net/send.c')
| -rw-r--r-- | nuttx/net/send.c | 698 |
1 files changed, 0 insertions, 698 deletions
diff --git a/nuttx/net/send.c b/nuttx/net/send.c deleted file mode 100644 index b26a0e5bb..000000000 --- a/nuttx/net/send.c +++ /dev/null @@ -1,698 +0,0 @@ -/**************************************************************************** - * net/send.c - * - * Copyright (C) 2007-2013 Gregory Nutt. All rights reserved. - * Author: Gregory Nutt <gnutt@nuttx.org> - * - * 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> -#if defined(CONFIG_NET) && defined(CONFIG_NET_TCP) - -#include <sys/types.h> -#include <sys/socket.h> - -#include <stdint.h> -#include <stdbool.h> -#include <string.h> -#include <errno.h> -#include <debug.h> - -#include <arch/irq.h> -#include <nuttx/clock.h> -#include <nuttx/net/uip/uip-arch.h> - -#ifdef CONFIG_NET_ARP_IPIN -# include <nuttx/net/uip/uip-arp.h> -#endif - -#include "net_internal.h" -#include "uip/uip_internal.h" - -/**************************************************************************** - * Definitions - ****************************************************************************/ - -#if defined(CONFIG_NET_TCP_SPLIT) && !defined(CONFIG_NET_TCP_SPLIT_SIZE) -# define CONFIG_NET_TCP_SPLIT_SIZE 40 -#endif - -#define TCPBUF ((struct uip_tcpip_hdr *)&dev->d_buf[UIP_LLH_LEN]) - -/**************************************************************************** - * Private Types - ****************************************************************************/ - -/* This structure holds the state of the send operation until it can be - * operated upon from the interrupt level. - */ - -struct send_s -{ - FAR struct socket *snd_sock; /* Points to the parent socket structure */ - FAR struct uip_callback_s *snd_cb; /* Reference to callback instance */ - sem_t snd_sem; /* Used to wake up the waiting thread */ - FAR const uint8_t *snd_buffer; /* Points to the buffer of data to send */ - size_t snd_buflen; /* Number of bytes in the buffer to send */ - 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 */ -#if defined(CONFIG_NET_SOCKOPTS) && !defined(CONFIG_DISABLE_CLOCK) - uint32_t snd_time; /* last send time for determining timeout */ -#endif -#if defined(CONFIG_NET_TCP_SPLIT) - bool snd_odd; /* True: Odd packet in pair transaction */ -#endif -}; - -/**************************************************************************** - * Private Functions - ****************************************************************************/ - -/**************************************************************************** - * Function: send_timeout - * - * Description: - * Check for send timeout. - * - * Parameters: - * pstate send state structure - * - * Returned Value: - * TRUE:timeout FALSE:no timeout - * - * Assumptions: - * Running at the interrupt level - * - ****************************************************************************/ - -#if defined(CONFIG_NET_SOCKOPTS) && !defined(CONFIG_DISABLE_CLOCK) -static inline int send_timeout(struct send_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 && !CONFIG_DISABLE_CLOCK */ - -/**************************************************************************** - * Function: send_interrupt - * - * Description: - * This function is called from the interrupt level to perform the actual - * send operation when polled by the uIP layer. - * - * Parameters: - * dev The sructure 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 send_interrupt(struct uip_driver_s *dev, void *pvconn, - void *pvpriv, uint16_t flags) -{ - struct uip_conn *conn = (struct uip_conn*)pvconn; - struct send_s *pstate = (struct send_s *)pvpriv; - - nllvdbg("flags: %04x acked: %d sent: %d\n", - flags, pstate->snd_acked, pstate->snd_sent); - - /* If this packet contains an acknowledgement, then update the count of - * acknowldged bytes. - */ - - if ((flags & UIP_ACKDATA) != 0) - { - /* 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 = uip_tcpgetsequence(TCPBUF->ackno) - pstate->snd_isn; - nllvdbg("ACK: acked=%d sent=%d buflen=%d\n", - pstate->snd_acked, pstate->snd_sent, pstate->snd_buflen); - - /* Have all of the bytes in the buffer been sent and acknowledged? */ - - if (pstate->snd_acked >= pstate->snd_buflen) - { - /* Yes. Then pstate->snd_buflen should hold the number of bytes - * actually sent. - */ - - goto end_wait; - } - - /* No.. fall through to send more data if necessary */ - } - - /* Check if we are being asked to retransmit data */ - - else if ((flags & UIP_REXMIT) != 0) - { - /* 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; - -#if defined(CONFIG_NET_TCP_SPLIT) - /* Reset the the even/odd indicator to even since we need to - * retransmit. - */ - - pstate->snd_odd = false; -#endif - - /* Fall through to re-send data from the last that was ACKed */ - } - - /* Check for a loss of connection */ - - else if ((flags & (UIP_CLOSE|UIP_ABORT|UIP_TIMEDOUT)) != 0) - { - /* Report not connected */ - - nllvdbg("Lost connection\n"); - - net_lostconnection(pstate->snd_sock, flags); - pstate->snd_sent = -ENOTCONN; - goto end_wait; - } - - /* Check if the outgoing packet is available (it may have been claimed - * by a sendto interrupt serving a different thread). - */ - -#if 0 /* We can't really support multiple senders on the same TCP socket */ - else if (dev->d_sndlen > 0) - { - /* Another thread has beat us sending data, wait for the next poll */ - - return flags; - } -#endif - - /* 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 & UIP_NEWDATA) == 0 && pstate->snd_sent < pstate->snd_buflen) - { - uint32_t seqno; - - /* Get the amount of data that we can send in the next packet */ - - uint32_t sndlen = pstate->snd_buflen - pstate->snd_sent; - - -#if defined(CONFIG_NET_TCP_SPLIT) - - /* RFC 1122 states that a host may delay ACKing for up to 500ms but - * must respond to every second segment). This logic here will trick - * the RFC 1122 recipient into responding sooner. This logic will be - * activated if: - * - * 1. An even number of packets has been send (where zero is an even - * number), - * 2. There is more data be sent (more than or equal to - * CONFIG_NET_TCP_SPLIT_SIZE), but - * 3. Not enough data for two packets. - * - * Then we will split the remaining, single packet into two partial - * packets. This will stimulate the RFC 1122 peer to ACK sooner. - * - * Don't try to split very small packets (less than CONFIG_NET_TCP_SPLIT_SIZE). - * Only the first even packet and the last odd packets could have - * sndlen less than CONFIG_NET_TCP_SPLIT_SIZE. The value of sndlen on - * the last even packet is guaranteed to be at least MSS/2 by the - * logic below. - */ - - if (sndlen >= CONFIG_NET_TCP_SPLIT_SIZE) - { - /* sndlen is the number of bytes remaining to be sent. - * uip_mss(conn) will return the number of bytes that can sent - * in one packet. The difference, then, is the number of bytes - * that would be sent in the next packet after this one. - */ - - int32_t next_sndlen = sndlen - uip_mss(conn); - - /* Is this the even packet in the packet pair transaction? */ - - if (!pstate->snd_odd) - { - /* next_sndlen <= 0 means that the entire remaining data - * could fit into this single packet. This is condition - * in which we must do the split. - */ - - if (next_sndlen <= 0) - { - /* Split so that there will be an odd packet. Here - * we know that 0 < sndlen <= MSS - */ - - sndlen = (sndlen / 2) + 1; - } - } - - /* No... this is the odd packet in the packet pair transaction */ - - else - { - /* Will there be another (even) packet afer this one? - * (next_sndlen > 0) Will the split conidition occur on that - * next, even packet? ((next_sndlen - uip_mss(conn)) < 0) If - * so, then perform the split now to avoid the case where the - * byte count is less than CONFIG_NET_TCP_SPLIT_SIZE on the - * next pair. - */ - - if (next_sndlen > 0 && (next_sndlen - uip_mss(conn)) < 0) - { - /* Here, we know that sndlen must be MSS < sndlen <= 2*MSS - * and so (sndlen / 2) is <= MSS. - */ - - sndlen /= 2; - } - } - } - - /* Toggle the even/odd indicator */ - - pstate->snd_odd ^= true; - -#endif /* CONFIG_NET_TCP_SPLIT */ - - if (sndlen > uip_mss(conn)) - { - sndlen = uip_mss(conn); - } - - /* 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\n", conn->sndseq, seqno); - uip_tcpsetsequence(conn->sndseq, seqno); - - /* Then set-up to send that amount of data. (this won't actually - * happen until the polling cycle completes). - */ - - uip_send(dev, &pstate->snd_buffer[pstate->snd_sent], sndlen); - - /* 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 incomming IP - * packets, then this check should not be necessary; the MAC mapping - * should already be in the ARP table. - */ - -#if defined(CONFIG_NET_ETHERNET) && defined (CONFIG_NET_ARP_IPIN) - if (pstate->snd_sent != 0 || uip_arp_find(conn->ripaddr) != NULL) -#endif - { - /* Update the amount of data sent (but not necessarily ACKed) */ - - pstate->snd_sent += sndlen; - nllvdbg("SEND: acked=%d sent=%d buflen=%d\n", - pstate->snd_acked, pstate->snd_sent, pstate->snd_buflen); - - /* Update the send time */ - -#if defined(CONFIG_NET_SOCKOPTS) && !defined(CONFIG_DISABLE_CLOCK) - pstate->snd_time = clock_systimer(); -#endif - } - } - - /* 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 defined(CONFIG_NET_SOCKOPTS) && !defined(CONFIG_DISABLE_CLOCK) - else if (send_timeout(pstate)) - { - /* Yes.. report the timeout */ - - nlldbg("SEND timeout\n"); - pstate->snd_sent = -ETIMEDOUT; - goto end_wait; - } -#endif /* CONFIG_NET_SOCKOPTS && !CONFIG_DISABLE_CLOCK */ - - /* Continue waiting */ - - return flags; - -end_wait: - /* Do not allow any further callbacks */ - - pstate->snd_cb->flags = 0; - pstate->snd_cb->priv = NULL; - pstate->snd_cb->event = NULL; - - /* There are no outstanding, unacknowledged bytes */ - - conn->unacked = 0; - - /* Wake up the waiting thread */ - - sem_post(&pstate->snd_sem); - return flags; -} - -/**************************************************************************** - * Public Functions - ****************************************************************************/ - -/**************************************************************************** - * Function: psock_send - * - * 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 psock_send(FAR struct socket *psock, const void *buf, size_t len, int flags) -{ - struct send_s state; - uip_lock_t save; - int err; - int ret = OK; - - /* Verify that the sockfd corresponds to valid, allocated socket */ - - if (!psock || psock->s_crefs <= 0) - { - 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)) - { - err = ENOTCONN; - goto errout; - } - - /* Set the socket state to sending */ - - psock->s_flags = _SS_SETSTATE(psock->s_flags, _SF_SEND); - - /* Perform the TCP send operation */ - - /* Initialize the state structure. This is done with interrupts - * disabled because we don't want anything to happen until we - * are ready. - */ - - save = uip_lock(); - memset(&state, 0, sizeof(struct send_s)); - (void)sem_init(&state. snd_sem, 0, 0); /* Doesn't really fail */ - state.snd_sock = psock; /* Socket descriptor to use */ - state.snd_buflen = len; /* Number of bytes to send */ - state.snd_buffer = buf; /* Buffer to send from */ - - if (len > 0) - { - struct uip_conn *conn = (struct uip_conn*)psock->s_conn; - - /* Allocate resources to receive a callback */ - - state.snd_cb = uip_tcpcallbackalloc(conn); - if (state.snd_cb) - { - /* Get the initial sequence number that will be used */ - - state.snd_isn = uip_tcpgetsequence(conn->sndseq); - - /* There is no outstanding, unacknowledged data after this - * initial sequence number. - */ - - conn->unacked = 0; - - /* Update the initial time for calculating timeouts */ - -#if defined(CONFIG_NET_SOCKOPTS) && !defined(CONFIG_DISABLE_CLOCK) - state.snd_time = clock_systimer(); -#endif - /* Set up the callback in the connection */ - - state.snd_cb->flags = UIP_ACKDATA|UIP_REXMIT|UIP_POLL|UIP_CLOSE|UIP_ABORT|UIP_TIMEDOUT; - state.snd_cb->priv = (void*)&state; - state.snd_cb->event = send_interrupt; - - /* Notify the device driver of the availaibilty of TX data */ - - netdev_txnotify(&conn->ripaddr); - - /* Wait for the send to complete or an error to occur: NOTES: (1) - * uip_lockedwait will also terminate if a signal is received, (2) interrupts - * may be disabled! They will be re-enabled while the task sleeps and - * automatically re-enabled when the task restarts. - */ - - ret = uip_lockedwait(&state. snd_sem); - - /* Make sure that no further interrupts are processed */ - - uip_tcpcallbackfree(conn, state.snd_cb); - } - } - - sem_destroy(&state. snd_sem); - uip_unlock(save); - - /* Set the socket state to idle */ - - psock->s_flags = _SS_SETSTATE(psock->s_flags, _SF_IDLE); - - /* Check for a errors. Errors are signaled by negative errno values - * for the send length - */ - - if (state.snd_sent < 0) - { - err = state.snd_sent; - goto errout; - } - - /* If uip_lockedwait failed, then we were probably reawakened by a signal. In - * this case, uip_lockedwait will have set errno appropriately. - */ - - if (ret < 0) - { - err = -ret; - goto errout; - } - - /* Return the number of bytes actually sent */ - - return state.snd_sent; - -errout: - *get_errno_ptr() = err; - return ERROR; -} - -/**************************************************************************** - * Function: send - * - * 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: - * sockfd Socket descriptor of socket - * 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 send(int sockfd, const void *buf, size_t len, int flags) -{ - return psock_send(sockfd_socket(sockfd), buf, len, flags); -} - -#endif /* CONFIG_NET && CONFIG_NET_TCP */ |