common/ktli/t_kconnect.c

	t_kconnect.c revision 0fd7766084e66e6e9fda9eb800b67bbf965d4bff
/*
 * 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 (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/*    All Rights Reserved   */

/*
 * University Copyright- Copyright (c) 1982, 1986, 1988
 * The Regents of the University of California
 * All Rights Reserved
 *
 * University Acknowledgment- Portions of this document are derived from
 * software developed by the University of California, Berkeley, and its
 * contributors.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

/*
 * Kernel TLI-like function to allow a trasnport endpoint to initiate a
 * connection to another transport endpoint.  This function will wait for
 * an ack and a T_CONN_CON before returning.
 *
 * Returns:
 *  0 on success, and if rcvcall is non-NULL it shall be
 *  filled with the connection confirm data.
 *  Otherwise a positive error code.
 */

#include <sys/param.h>
#include <sys/types.h>
#include <sys/user.h>
#include <sys/file.h>
#include <sys/vnode.h>
#include <sys/errno.h>
#include <sys/stream.h>
#include <sys/ioctl.h>
#include <sys/stropts.h>
#include <sys/tihdr.h>
#include <sys/timod.h>
#include <sys/tiuser.h>
#include <sys/t_kuser.h>
#include <sys/strsubr.h>
#include <sys/sysmacros.h>
#include <sys/strsun.h>


int
t_kconnect(TIUSER *tiptr, struct t_call *sndcall, struct t_call *rcvcall)
{
    int         len;
    int         msgsz;
    size_t          hdrsz;
    struct T_conn_req   *creq;
    union T_primitives  *pptr;
    mblk_t          *nbp;
    file_t          *fp;
    mblk_t          *bp;
    int         error;
    int         flag;

    error = 0;

    fp = tiptr->fp;
    msgsz = (int)TCONNREQSZ;
    while (!(bp = allocb(msgsz + sndcall->addr.len + sndcall->opt.len,
        BPRI_LO))) {
        if (strwaitbuf(msgsz + sndcall->addr.len + sndcall->opt.len,
            BPRI_LO))
            return (ENOSR);
    }

    /* LINTED pointer alignment */
    creq = (struct T_conn_req *)bp->b_wptr;
    creq->PRIM_type = T_CONN_REQ;
    creq->DEST_length = (t_scalar_t)sndcall->addr.len;
    creq->OPT_length = (t_scalar_t)sndcall->opt.len;

    if (sndcall->addr.len) {
        bcopy(sndcall->addr.buf, (bp->b_wptr+msgsz), sndcall->addr.len);
        creq->DEST_offset = (t_scalar_t)msgsz;
        msgsz += sndcall->addr.len;
    } else
        creq->DEST_offset = (t_scalar_t)0;

    if (sndcall->opt.len) {
        bcopy(sndcall->opt.buf, (bp->b_wptr+msgsz), sndcall->opt.len);
        creq->OPT_offset = (t_scalar_t)msgsz;
        msgsz += sndcall->opt.len;
    } else
        creq->OPT_offset = (t_scalar_t)0;

    bp->b_datap->db_type = M_PROTO;
    bp->b_wptr += msgsz;

    /*
     * copy the users data, if any.
     */
    if (sndcall->udata.len) {
        /*
         * if CO then we would allocate a data block and
         * put the users connect data into it.
         */
        KTLILOG(1,
            "Attempt to send connectionless data on T_CONN_REQ\n", 0);
        freemsg(bp);
        return (EPROTO);
    }

    flag = fp->f_flag;

    /*
     * send it
     */
    if ((error = tli_send(tiptr, bp, flag)) != 0)
        return (error);

    /*
     * wait for acknowledgment
     */
    if ((error = get_ok_ack(tiptr, T_CONN_REQ, flag)) != 0)
        return (error);

    bp = NULL;
    /*
     * wait for CONfirm
     */
    if ((error = tli_recv(tiptr, &bp, flag)) != 0)
        return (error);

    if (bp->b_datap->db_type != M_PROTO) {
        freemsg(bp);
        return (EPROTO);
    }

    /* LINTED pointer alignment */
    pptr = (union T_primitives *)bp->b_rptr;
    switch (pptr->type) {
    case T_CONN_CON:
        hdrsz = MBLKL(bp);

        /*
         * check everything for consistency
         */
        if (hdrsz < TCONNCONSZ ||
            hdrsz < (pptr->conn_con.OPT_length +
            pptr->conn_con.OPT_offset) ||
            hdrsz < (pptr->conn_con.RES_length +
            pptr->conn_con.RES_offset)) {
            error = EPROTO;
            freemsg(bp);
            break;
        }

        if (rcvcall != NULL) {
            /*
             * okay, so now we copy them
             */
            len = MIN(pptr->conn_con.RES_length,
                rcvcall->addr.maxlen);
            bcopy(bp->b_rptr + pptr->conn_con.RES_offset,
                rcvcall->addr.buf, len);
            rcvcall->addr.len = len;

            len = MIN(pptr->conn_con.OPT_length,
                rcvcall->opt.maxlen);
            bcopy(bp->b_rptr + pptr->conn_con.OPT_offset,
                rcvcall->opt.buf, len);
            rcvcall->opt.len = len;

            if (bp->b_cont) {
                nbp = bp;
                bp = bp->b_cont;
                msgsz = (int)MBLKL(bp);
                len = MIN(msgsz, rcvcall->udata.maxlen);
                bcopy(bp->b_rptr, rcvcall->udata.buf, len);
                rcvcall->udata.len = len;
                freemsg(nbp);
            }
        } else {
            freemsg(bp);
        }
        break;

    case T_DISCON_IND:
        /*
         * TCP puts the errno here, i.e.
         * ETIMEDOUT, ECONNREFUSED
         */
        error = pptr->discon_ind.DISCON_reason;
        freemsg(bp);
        break;

    default:
        error = EPROTO;
        freemsg(bp);
        break;
    }
    return (error);
}