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 (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 
  22 /*
  23  * Copyright (c) 1989, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Copyright 2015, Joyent Inc.
  25  * Copyright 2017 Nexenta Systems, Inc.  All rights reserved.
  26  */
  27 
  28 /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T     */
  29 /*      All Rights Reserved */
  30 
  31 /*
  32  * The kTLI "shim" over in ./fake_ktli.c uses getf(), releasef() to
  33  * represent an open socket FD in "fake" vnode_t and file_t objects.
  34  * This implements minimal getf()/releasef() shims for that purpose.
  35  */
  36 
  37 #include <sys/types.h>
  38 #include <sys/sysmacros.h>
  39 #include <sys/param.h>
  40 #include <sys/systm.h>
  41 #include <sys/errno.h>
  42 #include <sys/cred.h>
  43 #include <sys/user.h>
  44 #include <sys/vfs.h>
  45 #include <sys/vnode.h>
  46 #include <sys/file.h>
  47 #include <sys/debug.h>
  48 #include <sys/kmem.h>
  49 
  50 #define FAKEFDS 256
  51 
  52 kmutex_t ftlock;
  53 file_t *ftab[FAKEFDS];
  54 
  55 file_t *
  56 getf(int fd)
  57 {
  58         file_t *fp;
  59         vnode_t *vp;
  60 
  61         if (fd >= FAKEFDS)
  62                 return (NULL);
  63 
  64         mutex_enter(&ftlock);
  65         if ((fp = ftab[fd]) != NULL) {
  66                 fp->f_count++;
  67                 mutex_exit(&ftlock);
  68                 return (fp);
  69         }
  70 
  71         fp = kmem_zalloc(sizeof (*fp), KM_SLEEP);
  72         vp = kmem_zalloc(sizeof (*vp), KM_SLEEP);
  73         vp->v_fd = fd;
  74         fp->f_vnode = vp;
  75         fp->f_count = 1;
  76         ftab[fd] = fp;
  77 
  78         mutex_exit(&ftlock);
  79 
  80         return (fp);
  81 }
  82 
  83 void
  84 releasef(int fd)
  85 {
  86         file_t *fp;
  87         vnode_t *vp;
  88 
  89         mutex_enter(&ftlock);
  90         if ((fp = ftab[fd]) == NULL) {
  91                 mutex_exit(&ftlock);
  92                 return;
  93         }
  94         fp->f_count--;
  95         if (fp->f_count > 0) {
  96                 mutex_exit(&ftlock);
  97                 return;
  98         }
  99         ftab[fd] = NULL;
 100         mutex_exit(&ftlock);
 101 
 102         vp = fp->f_vnode;
 103         kmem_free(vp, sizeof (*vp));
 104         kmem_free(fp, sizeof (*fp));
 105 }