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
52kmutex_t ftlock;
53file_t *ftab[FAKEFDS];
54
55file_t *
56getf(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
83void
84releasef(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}
106