xref: /netbsd-src/sys/compat/common/rndpseudo_50.c (revision 6bf9fb1500e41eae5c10150bbbd1e377aac0c43c)
1 /*	$NetBSD: rndpseudo_50.c,v 1.7 2020/04/30 03:30:10 riastradh Exp $	*/
2 
3 /*-
4  * Copyright (c) 1997-2011 The NetBSD Foundation, Inc.
5  * All rights reserved.
6  *
7  * This code is derived from software contributed to The NetBSD Foundation
8  * by Michael Graff <explorer@flame.org> and Thor Lancelot Simon.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice, this list of conditions and the following disclaimer.
15  * 2. Redistributions in binary form must reproduce the above copyright
16  *    notice, this list of conditions and the following disclaimer in the
17  *    documentation and/or other materials provided with the distribution.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29  * POSSIBILITY OF SUCH DAMAGE.
30  */
31 
32 #include <sys/cdefs.h>
33 __KERNEL_RCSID(0, "$NetBSD: rndpseudo_50.c,v 1.7 2020/04/30 03:30:10 riastradh Exp $");
34 
35 #if defined(_KERNEL_OPT)
36 #include "opt_compat_netbsd.h"
37 #endif
38 
39 #include <sys/param.h>
40 #include <sys/file.h>
41 #include <sys/module_hook.h>
42 #include <sys/compat_stub.h>
43 
44 #include <compat/sys/rnd.h>
45 #include <compat/common/compat_mod.h>
46 
47 /*
48  * Convert from rndsource_t to rndsource50_t, for the results from
49  * RNDGETNUM50 and RNDGETNAME50.
50  */
51 static void
rndsource_to_rndsource50(rndsource_t * r,rndsource50_t * r50)52 rndsource_to_rndsource50(rndsource_t *r, rndsource50_t *r50)
53 {
54 	memset(r50, 0, sizeof(*r50));
55 	strlcpy(r50->name, r->name, sizeof(r50->name));
56 	r50->total = r->total;
57 	r50->type = r->type;
58 	r50->flags = r->flags;
59 }
60 
61 /*
62  * COMPAT_50 handling for rnd_ioctl.  This is called from rnd_ioctl.
63  *
64  * It also handles the case of (COMPAT_50 && COMPAT_NETBSD32).
65  */
66 int
compat_50_rnd_ioctl(struct file * fp,u_long cmd,void * addr)67 compat_50_rnd_ioctl(struct file *fp, u_long cmd, void *addr)
68 {
69 	int ret = 0;
70 
71 	switch (cmd) {
72 
73 	case RNDGETSRCNUM50:
74 	{
75 		rndstat_t rstbuf = {.start = 0};
76 		rndstat50_t *rst50 = (rndstat50_t *)addr;
77 		size_t count;
78 
79 		if (rst50->count > RND_MAXSTATCOUNT50)
80 			return EINVAL;
81 
82 		rstbuf.start = rst50->start;
83 		rstbuf.count = rst50->count;
84 
85 		ret = (fp->f_ops->fo_ioctl)(fp, RNDGETSRCNUM, &rstbuf);
86 		if (ret != 0)
87 			return ret;
88 
89 		for (count = 0; count < rst50->count; count++) {
90 			rndsource_to_rndsource50(&rstbuf.source[count],
91 			    &rst50->source[count]);
92 		}
93 		rst50->count = rstbuf.count;
94 
95 		break;
96 	}
97 
98 	case RNDGETSRCNAME50:
99 	{
100 		rndstat_name_t rstnmbuf = {.name[0] = 0};
101 		rndstat_name50_t *rstnm50;
102 		rstnm50 = (rndstat_name50_t *)addr;
103 
104 		strlcpy(rstnmbuf.name, rstnm50->name, sizeof(rstnmbuf.name));
105 
106 		ret = (fp->f_ops->fo_ioctl)(fp, RNDGETSRCNAME, &rstnmbuf);
107 		if (ret != 0)
108 			return ret;
109 
110 		rndsource_to_rndsource50(&rstnmbuf.source, &rstnm50->source);
111 
112 		break;
113 	}
114 
115 	default:
116 		return ENOTTY;
117 	}
118 
119 	return ret;
120 }
121 
122 void
rndpseudo_50_init(void)123 rndpseudo_50_init(void)
124 {
125 
126 	MODULE_HOOK_SET(rnd_ioctl_50_hook, compat_50_rnd_ioctl);
127 }
128 
129 void
rndpseudo_50_fini(void)130 rndpseudo_50_fini(void)
131 {
132 
133 	MODULE_HOOK_UNSET(rnd_ioctl_50_hook);
134 }
135