t_kconnect.c revision de8c4a14ec9a49bad5e62b2cfa6c1ba21de1c708
/*
* 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 2009 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.
*/
/*
* 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;
/*
* Usually connect()s are performed with the credential of the caller;
* in this particular case we specifically use the credential of
* the opener as this call is typically done in the context of a user
* process but on behalf of the kernel, e.g., a client connection
* to a server which is later shared by different users.
* At open time, we make sure to set fp->f_cred to kcred if such is
* the case.
*
* Note: if the receiver uses SCM_UCRED/getpeerucred the pid will
* appear as -1.
*/
while (!(bp = allocb_cred(msgsz + sndcall->addr.len + sndcall->opt.len,
fp->f_cred, NOPID))) {
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);
}