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      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 (at) 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
     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
     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
    123 rndpseudo_50_init(void)
    124 {
    125 
    126 	MODULE_HOOK_SET(rnd_ioctl_50_hook, compat_50_rnd_ioctl);
    127 }
    128 
    129 void
    130 rndpseudo_50_fini(void)
    131 {
    132 
    133 	MODULE_HOOK_UNSET(rnd_ioctl_50_hook);
    134 }
    135