fs/smbsrv/smb_net.c

	smb_net.c revision a90cf9f29973990687fa61de9f1f6ea22e924e40
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 *
 * Copyright 2015 Nexenta Systems, Inc.  All rights reserved.
 */

#include <sys/types.h>
#include <sys/param.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>
#include <sys/time.h>
#include <sys/varargs.h>
#include <sys/modctl.h>
#include <sys/pathname.h>
#include <sys/vnode.h>
#include <sys/socket.h>
#include <sys/ksocket.h>
#undef mem_free /* XXX Remove this after we convert everything to kmem_alloc */

#include <smbsrv/smb_vops.h>
#include <smbsrv/smb.h>
#include <smbsrv/smb_kproto.h>
#include <smbsrv/smb_kstat.h>

/*
 * SMB Network Socket API
 *
 * smb_socreate:    Creates an socket based on domain/type.
 * smb_soshutdown:  Disconnect a socket created with smb_socreate
 * smb_sodestroy:   Release resources associated with a socket
 * smb_sosend:      Send the contents of a buffer on a socket
 * smb_sorecv:      Receive data into a buffer from a socket
 * smb_iov_sosend:  Send the contents of an iovec on a socket
 * smb_iov_sorecv:  Receive data into an iovec from a socket
 */

ksocket_t
smb_socreate(int domain, int type, int protocol)
{
    ksocket_t   sock;
    int     err = 0;

    err = ksocket_socket(&sock, domain, type, protocol, KSOCKET_SLEEP,
        CRED());

    if (err != 0)
        return (NULL);
    else
        return (sock);
}

/*
 * smb_soshutdown will disconnect the socket and prevent subsequent PDU
 * reception and transmission.  The sonode still exists but its state
 * gets modified to indicate it is no longer connected.  Calls to
 * smb_sorecv/smb_iov_sorecv will return so smb_soshutdown can be used
 * regain control of a thread stuck in smb_sorecv.
 */
void
smb_soshutdown(ksocket_t so)
{
    (void) ksocket_shutdown(so, SHUT_RDWR, CRED());
}

/*
 * smb_sodestroy releases all resources associated with a socket previously
 * created with smb_socreate.  The socket must be shutdown using smb_soshutdown
 * before the socket is destroyed with smb_sodestroy, otherwise undefined
 * behavior will result.
 */
void
smb_sodestroy(ksocket_t so)
{
    (void) ksocket_close(so, CRED());
}

int
smb_sorecv(ksocket_t so, void *msg, size_t len)
{
    size_t recvd;
    int err;

    ASSERT(so != NULL);
    ASSERT(len != 0);

    if ((err = ksocket_recv(so, msg, len, MSG_WAITALL, &recvd,
        CRED())) != 0) {
        return (err);
    }

    /* Successful receive */
    return ((recvd == len) ? 0 : -1);
}

/*
 * smb_net_txl_constructor
 *
 *  Transmit list constructor
 */
void
smb_net_txl_constructor(smb_txlst_t *txl)
{
    ASSERT(txl->tl_magic != SMB_TXLST_MAGIC);

    mutex_init(&txl->tl_mutex, NULL, MUTEX_DEFAULT, NULL);
    cv_init(&txl->tl_wait_cv, NULL, CV_DEFAULT, NULL);
    txl->tl_active = B_FALSE;
    txl->tl_magic = SMB_TXLST_MAGIC;
}

/*
 * smb_net_txl_destructor
 *
 *  Transmit list destructor
 */
void
smb_net_txl_destructor(smb_txlst_t *txl)
{
    ASSERT(txl->tl_magic == SMB_TXLST_MAGIC);

    txl->tl_magic = 0;
    cv_destroy(&txl->tl_wait_cv);
    mutex_destroy(&txl->tl_mutex);
}

/*
 * smb_net_send_uio
 *
 * This routine puts the transmit buffer passed in on the wire.
 * If another thread is already sending, block on the CV.
 */
int
smb_net_send_uio(smb_session_t *s, struct uio *uio)
{
    struct msghdr msg;
    size_t sent;
    smb_txlst_t *txl = &s->s_txlst;
    int rc = 0;

    DTRACE_PROBE1(send__wait__start, struct smb_session_t *, s);

    /*
     * Wait for our turn to send.
     */
    mutex_enter(&txl->tl_mutex);
    while (txl->tl_active)
        cv_wait(&txl->tl_wait_cv, &txl->tl_mutex);

    /*
     * Did the connection close while we waited?
     */
    switch (s->s_state) {
    case SMB_SESSION_STATE_DISCONNECTED:
    case SMB_SESSION_STATE_TERMINATED:
        rc = ENOTCONN;
        break;
    default:
        txl->tl_active = B_TRUE;
        break;
    }
    mutex_exit(&txl->tl_mutex);

    DTRACE_PROBE1(send__wait__done, struct smb_session_t *, s);
    if (rc != 0)
        return (rc);

    /*
     * OK, try to send.
     *
     * This should block until we've sent it all,
     * or given up due to errors (socket closed).
     */
    bzero(&msg, sizeof (msg));
    msg.msg_iov = uio->uio_iov;
    msg.msg_iovlen = uio->uio_iovcnt;
    while (uio->uio_resid > 0) {
        rc = ksocket_sendmsg(s->sock, &msg, 0, &sent, CRED());
        if (rc != 0)
            break;
        uio->uio_resid -= sent;
    }

    mutex_enter(&txl->tl_mutex);
    txl->tl_active = B_FALSE;
    cv_signal(&txl->tl_wait_cv);
    mutex_exit(&txl->tl_mutex);

    return (rc);
}