/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (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 1997 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 allocate memory for the various TLI
 * primitives.
 *
 * Returns 0 on success or a positive error value.  On success, ptr is
 * set the structure required.
 */

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

static void _alloc_buf(struct netbuf *, t_scalar_t);

int
t_kalloc(TIUSER *tiptr, int struct_type, int fields, char **ptr)
{
        union structptrs {
                char *caddr;
                struct t_bind *bind;
                struct t_call *call;
                struct t_discon *dis;
                struct t_optmgmt *opt;
                struct t_kunitdata *udata;
                struct t_uderr *uderr;
                struct t_info *info;
        } p;
        t_scalar_t dsize;

        if (ptr == NULL)
                return (EINVAL);

        /*
         * allocate appropriate structure and the specified
         * fields within each structure.  Initialize the
         * 'buf' and 'maxlen' fields of each.
         */
        switch (struct_type) {
        case T_BIND:
                p.bind = kmem_zalloc(sizeof (struct t_bind), KM_SLEEP);
                if (fields & T_ADDR)
                        _alloc_buf(&p.bind->addr, tiptr->tp_info.addr);
                *ptr = ((char *)p.bind);
                return (0);

        case T_CALL:
                p.call = kmem_zalloc(sizeof (struct t_call), KM_SLEEP);
                if (fields & T_ADDR)
                        _alloc_buf(&p.call->addr, tiptr->tp_info.addr);
                if (fields & T_OPT)
                        _alloc_buf(&p.call->opt, tiptr->tp_info.options);
                if (fields & T_UDATA) {
                        dsize = MAX(tiptr->tp_info.connect,
                            tiptr->tp_info.discon);
                        _alloc_buf(&p.call->opt, dsize);
                }
                *ptr = ((char *)p.call);
                return (0);

        case T_OPTMGMT:
                p.opt = kmem_zalloc(sizeof (struct t_optmgmt), KM_SLEEP);
                if (fields & T_OPT)
                        _alloc_buf(&p.opt->opt, tiptr->tp_info.options);
                *ptr = ((char *)p.opt);
                return (0);

        case T_DIS:
                p.dis = kmem_zalloc(sizeof (struct t_discon), KM_SLEEP);
                if (fields & T_UDATA)
                        _alloc_buf(&p.dis->udata, tiptr->tp_info.discon);
                *ptr = ((char *)p.dis);
                return (0);

        case T_UNITDATA:
                p.udata = kmem_zalloc(sizeof (struct t_kunitdata), KM_SLEEP);
                if (fields & T_ADDR)
                        _alloc_buf(&p.udata->addr, tiptr->tp_info.addr);
                else
                        p.udata->addr.maxlen = p.udata->addr.len = 0;

                if (fields & T_OPT)
                        _alloc_buf(&p.udata->opt, tiptr->tp_info.options);
                else
                        p.udata->opt.maxlen = p.udata->opt.len = 0;

                if (fields & T_UDATA) {
                        p.udata->udata.udata_mp = NULL;
                        p.udata->udata.buf = NULL;
                        p.udata->udata.maxlen = tiptr->tp_info.tsdu;
                        p.udata->udata.len = 0;
                } else {
                        p.udata->udata.maxlen = p.udata->udata.len = 0;
                }
                *ptr = (char *)p.udata;
                return (0);

        case T_UDERROR:
                p.uderr = kmem_zalloc(sizeof (struct t_uderr), KM_SLEEP);
                if (fields & T_ADDR)
                        _alloc_buf(&p.uderr->addr, tiptr->tp_info.addr);
                if (fields & T_OPT)
                        _alloc_buf(&p.uderr->opt, tiptr->tp_info.options);
                *ptr = (char *)p.uderr;
                return (0);

        case T_INFO:
                p.info = kmem_zalloc(sizeof (struct t_info), KM_SLEEP);
                *ptr = (char *)p.info;
                return (0);

        default:
                return (EINVAL);
        }
}


static void
_alloc_buf(struct netbuf *buf, t_scalar_t n)
{
        switch (n) {
        case -1:
                buf->buf = kmem_zalloc(1024, KM_SLEEP);
                buf->maxlen = 1024;
                buf->len = 0;
                break;

        case 0:
        case -2:
                buf->buf = NULL;
                buf->maxlen = 0;
                buf->len = 0;
                break;

        default:
                buf->buf = kmem_zalloc(n, KM_SLEEP);
                buf->maxlen = n;
                buf->len = 0;
                break;
        }
}