xref: /illumos-gate/usr/src/uts/common/ktli/t_kopen.c (revision 746b0187)

/*
 * 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 2007 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 initialize a transport
 * endpoint using the protocol specified.
 *
 * Returns:
 * 	0 on success and "tiptr" is set to a valid transport pointer,
 * 	else a positive error code.
 */

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

static t_scalar_t _t_setsize(t_scalar_t);

int
t_kopen(file_t *fp, dev_t rdev, int flags, TIUSER **tiptr, cred_t *cr)
{
	int			madefp = 0;
	struct T_info_ack	inforeq;
	int			retval;
	vnode_t			*vp;
	struct strioctl		strioc;
	int			error;
	TIUSER			*ntiptr;
	int			rtries = 0;

	/*
	 * Special case for install: miniroot needs to be able to access files
	 * via NFS as though it were always in the global zone.
	 */
	if (nfs_global_client_only != 0)
		cr = kcred;

	KTLILOG(2, "t_kopen: fp %x, ", fp);
	KTLILOG(2, "rdev %x, ", rdev);
	KTLILOG(2, "flags %x\n", flags);

	*tiptr = NULL;
	error = 0;
	retval = 0;
	if (fp == NULL) {
		if (rdev == NODEV) {
			KTLILOG(1, "t_kopen: null device\n", 0);
			return (EINVAL);
		}

		/*
		 * allocate a file pointer, but
		 * no file descripter.
		 */
		if ((error = falloc(NULL, flags, &fp, NULL)) != 0) {
			KTLILOG(1, "t_kopen: falloc: %d\n", error);
			return (error);
		}

		/* Install proper cred in file */
		if (cr != fp->f_cred) {
			crhold(cr);
			crfree(fp->f_cred);
			fp->f_cred = cr;
		}

		vp = makespecvp(rdev, VCHR);

		/*
		 * this will call the streams open for us.
		 * Want to retry if error is EAGAIN, the streams open routine
		 * might fail due to temporarely out of memory.
		 */
		do {
			if ((error = VOP_OPEN(&vp, flags, cr, NULL))
			    == EAGAIN) {
				(void) delay(hz);
			}
		} while (error == EAGAIN && ++rtries < 5);

		if (error) {
			KTLILOG(1, "t_kopen: VOP_OPEN: %d\n", error);
			unfalloc(fp);
			VN_RELE(vp);
			return (error);
		}
		/*
		 * fp is completely initialized so drop the write lock.
		 * I actually don't need any locking on fp in here since
		 * there is no fd pointing at it.  However, since I could
		 * call closef if there is an error and closef requires
		 * the fp read locked, I will acquire the read lock here
		 * and make sure I release it before I leave this routine.
		 */
		fp->f_vnode = vp;
		mutex_exit(&fp->f_tlock);

		madefp = 1;
	} else {
		vp = fp->f_vnode;
	}

	if (vp->v_stream == NULL) {
		if (madefp)
			(void) closef(fp);
		KTLILOG(1, "t_kopen: not a streams device\n", 0);
		return (ENOSTR);
	}

	/*
	 * allocate a new transport structure
	 */
	ntiptr = kmem_alloc(TIUSERSZ, KM_SLEEP);
	ntiptr->fp = fp;
	ntiptr->flags = madefp ? MADE_FP : 0;

	KTLILOG(2, "t_kopen: vp %x, ", vp);
	KTLILOG(2, "stp %x\n", vp->v_stream);

	/*
	 * see if TIMOD is already pushed
	 */
	error = strioctl(vp, I_FIND, (intptr_t)"timod", 0, K_TO_K, cr, &retval);
	if (error) {
		kmem_free(ntiptr, TIUSERSZ);
		if (madefp)
			(void) closef(fp);
		KTLILOG(1, "t_kopen: strioctl(I_FIND, timod): %d\n", error);
		return (error);
	}

	if (retval == 0) {
tryagain:
		error = strioctl(vp, I_PUSH, (intptr_t)"timod", 0, K_TO_K, cr,
		    &retval);
		if (error) {
			switch (error) {
			case ENOSPC:
			case EAGAIN:
			case ENOSR:
				/*
				 * This probably means the master file
				 * should be tuned.
				 */
				cmn_err(CE_WARN,
				"t_kopen: I_PUSH of timod failed, error %d\n",
				    error);
				(void) delay(hz);
				error = 0;
				goto tryagain;

			default:
				kmem_free(ntiptr, TIUSERSZ);
				if (madefp)
					(void) closef(fp);
				KTLILOG(1, "t_kopen: I_PUSH (timod): %d",
				    error);
				return (error);
			}
		}
	}

	inforeq.PRIM_type = T_INFO_REQ;
	strioc.ic_cmd = TI_GETINFO;
	strioc.ic_timout = 0;
	strioc.ic_dp = (char *)&inforeq;
	strioc.ic_len = (int)sizeof (struct T_info_req);

	error = strdoioctl(vp->v_stream, &strioc, FNATIVE, K_TO_K, cr, &retval);
	if (error) {
		kmem_free(ntiptr, TIUSERSZ);
		if (madefp)
			(void) closef(fp);
		KTLILOG(1, "t_kopen: strdoioctl(T_INFO_REQ): %d\n", error);
		return (error);
	}

	if (retval) {
		if ((retval & 0xff) == TSYSERR)
			error = (retval >> 8) & 0xff;
		else
			error = t_tlitosyserr(retval & 0xff);
		kmem_free(ntiptr, TIUSERSZ);
		if (madefp)
			(void) closef(fp);
		KTLILOG(1, "t_kopen: strdoioctl(T_INFO_REQ): retval: 0x%x\n",
		    retval);
		return (error);
	}

	if (strioc.ic_len != sizeof (struct T_info_ack)) {
		kmem_free(ntiptr, TIUSERSZ);
		if (madefp)
			(void) closef(fp);
		KTLILOG(1,
		"t_kopen: strioc.ic_len != sizeof (struct T_info_ack): %d\n",
		    strioc.ic_len);
		return (EPROTO);
	}

	ntiptr->tp_info.addr = _t_setsize(inforeq.ADDR_size);
	ntiptr->tp_info.options = _t_setsize(inforeq.OPT_size);
	ntiptr->tp_info.tsdu = _t_setsize(inforeq.TSDU_size);
	ntiptr->tp_info.etsdu = _t_setsize(inforeq.ETSDU_size);
	ntiptr->tp_info.connect = _t_setsize(inforeq.CDATA_size);
	ntiptr->tp_info.discon = _t_setsize(inforeq.DDATA_size);
	ntiptr->tp_info.servtype = inforeq.SERV_type;

	*tiptr = ntiptr;

	return (0);
}

#define	DEFSIZE	128

static t_scalar_t
_t_setsize(t_scalar_t infosize)
{
	switch (infosize) {
	case -1:
		return (DEFSIZE);
	case -2:
		return (0);
	default:
		return (infosize);
	}
}