usr/src/uts/common/ktli/t_kbind.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
  28 /*        All Rights Reserved   */
  29
  30 /*
  31  * University Copyright- Copyright (c) 1982, 1986, 1988
  32  * The Regents of the University of California
  33  * All Rights Reserved
  34  *
  35  * University Acknowledgment- Portions of this document are derived from
  36  * software developed by the University of California, Berkeley, and its
  37  * contributors.
  38  */
  39
  40 #pragma ident   "%Z%%M% %I%     %E% SMI"
  41
  42 /*
  43  * Kernel TLI-like function to bind a transport endpoint
  44  * to an address.
  45  *
  46  * Returns 0 on success or positive error code.
  47  */
  48
  49 #include <sys/param.h>
  50 #include <sys/types.h>
  51 #include <sys/proc.h>
  52 #include <sys/file.h>
  53 #include <sys/user.h>
  54 #include <sys/errno.h>
  55 #include <sys/stream.h>
  56 #include <sys/strsubr.h>
  57 #include <sys/ioctl.h>
  58 #include <sys/stropts.h>
  59 #include <sys/vnode.h>
  60 #include <sys/tihdr.h>
  61 #include <sys/timod.h>
  62 #include <sys/tiuser.h>
  63 #include <sys/t_kuser.h>
  64 #include <sys/kmem.h>
  65 #include <sys/sysmacros.h>
  66
  67 int
  68 t_kbind(TIUSER *tiptr, struct t_bind *req, struct t_bind *ret)
  69 {
  70         struct T_bind_req       *bind_req;
  71         struct T_bind_ack       *bind_ack;
  72         int                     bindsz;
  73         vnode_t                 *vp;
  74         file_t                  *fp;
  75         char                    *buf;
  76         struct strioctl         strioc;
  77         int                     retval;
  78         int                     error;
  79
  80         error = 0;
  81         retval = 0;
  82         fp = tiptr->fp;
  83         vp = fp->f_vnode;
  84
  85         /*
  86          * send the ioctl request and wait
  87          * for a reply.
  88          */
  89         bindsz = (req == NULL) ? 0 : req->addr.len;
  90         bindsz = MAX(bindsz, tiptr->tp_info.addr);
  91         bindsz += MAX(TBINDREQSZ, TBINDACKSZ);
  92         buf = kmem_alloc(bindsz, KM_SLEEP);
  93
  94         /* LINTED pointer alignment */
  95         bind_req = (struct T_bind_req *)buf;
  96         bind_req->PRIM_type = T_BIND_REQ;
  97         bind_req->ADDR_length = (req == NULL ? 0 : req->addr.len);
  98         bind_req->ADDR_offset = TBINDREQSZ;
  99         bind_req->CONIND_number = (req == NULL ? 0 : req->qlen);
 100
 101         if (bind_req->ADDR_length)
 102                 bcopy(req->addr.buf, buf + bind_req->ADDR_offset,
 103                     bind_req->ADDR_length);
 104
 105         strioc.ic_cmd = TI_BIND;
 106         strioc.ic_timout = 0;
 107         strioc.ic_dp = buf;
 108         strioc.ic_len = (int)TBINDREQSZ + bind_req->ADDR_length;
 109
 110         /*
 111          * Usually ioctl()s are performed with the credential of the caller;
 112          * in this particular case we specifically use the credential of
 113          * the opener as this call is typically done in the context of a user
 114          * process but on behalf of the kernel, e.g., a client connection
 115          * to a server which is later shared by different users.
 116          * At open time, we make sure to set fp->f_cred to kcred if such is
 117          * the case.
 118          */
 119         error = strdoioctl(vp->v_stream, &strioc, FNATIVE, K_TO_K, fp->f_cred,
 120             &retval);
 121         if (error)
 122                 goto badbind;
 123         if (retval) {
 124                 if ((retval & 0xff) == TSYSERR)
 125                         error = (retval >> 8) & 0xff;
 126                 else
 127                         error = t_tlitosyserr(retval & 0xff);
 128                 goto badbind;
 129         }
 130
 131         /* LINTED pointer alignment */
 132         bind_ack = (struct T_bind_ack *)strioc.ic_dp;
 133         if (strioc.ic_len < TBINDACKSZ || bind_ack->ADDR_length == 0) {
 134                 error = EIO;
 135                 goto badbind;
 136         }
 137
 138         /*
 139          * copy bind data into users buffer
 140          */
 141         if (ret) {
 142                 if (ret->addr.maxlen > bind_ack->ADDR_length)
 143                         ret->addr.len = bind_ack->ADDR_length;
 144                 else
 145                         ret->addr.len = ret->addr.maxlen;
 146
 147                 bcopy(buf + bind_ack->ADDR_offset, ret->addr.buf,
 148                     ret->addr.len);
 149
 150                 ret->qlen = bind_ack->CONIND_number;
 151         }
 152
 153 badbind:
 154         kmem_free(buf, bindsz);
 155         return (error);
 156 }