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 *
getf(int fd)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
releasef(int fd)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 }
106