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rndpseudo_50.c revision 1.5 
      1 /*	$NetBSD: rndpseudo_50.c,v 1.5 2019/09/26 01:28:27 christos 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 1.5 2019/09/26 01:28:27 christos 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 
     42 #include <sys/rnd.h>
     43 #include <sys/module_hook.h>
     44 #include <sys/compat_stub.h>
     45 
     46 #include <compat/sys/rnd.h>
     47 #include <compat/common/compat_mod.h>
     48 
     49 /*
     50  * Convert from rndsource_t to rndsource50_t, for the results from
     51  * RNDGETNUM50 and RNDGETNAME50.
     52  */
     53 static void
     54 rndsource_to_rndsource50(rndsource_t *r, rndsource50_t *r50)
     55 {
     56 	memset(r50, 0, sizeof(*r50));
     57 	strlcpy(r50->name, r->name, sizeof(r50->name));
     58 	r50->total = r->total;
     59 	r50->type = r->type;
     60 	r50->flags = r->flags;
     61 }
     62 
     63 /*
     64  * COMPAT_50 handling for rnd_ioctl.  This is called from rnd_ioctl.
     65  *
     66  * It also handles the case of (COMPAT_50 && COMPAT_NETBSD32).
     67  */
     68 int
     69 compat_50_rnd_ioctl(struct file *fp, u_long cmd, void *addr)
     70 {
     71 	int ret = 0;
     72 
     73 	switch (cmd) {
     74 
     75 	case RNDGETSRCNUM50:
     76 	{
     77 		rndstat_t rstbuf = {.start = 0};
     78 		rndstat50_t *rst50 = (rndstat50_t *)addr;
     79 		size_t count;
     80 
     81 		if (rst50->count > RND_MAXSTATCOUNT50)
     82 			return EINVAL;
     83 
     84 		rstbuf.start = rst50->start;
     85 		rstbuf.count = rst50->count;
     86 
     87 		ret = (fp->f_ops->fo_ioctl)(fp, RNDGETSRCNUM, &rstbuf);
     88 		if (ret != 0)
     89 			return ret;
     90 
     91 		for (count = 0; count < rst50->count; count++) {
     92 			rndsource_to_rndsource50(&rstbuf.source[count],
     93 			    &rst50->source[count]);
     94 		}
     95 		rst50->count = rstbuf.count;
     96 
     97 		break;
     98 	}
     99 
    100 	case RNDGETSRCNAME50:
    101 	{
    102 		rndstat_name_t rstnmbuf = {.name[0] = 0};
    103 		rndstat_name50_t *rstnm50;
    104 		rstnm50 = (rndstat_name50_t *)addr;
    105 
    106 		strlcpy(rstnmbuf.name, rstnm50->name, sizeof(rstnmbuf.name));
    107 
    108 		ret = (fp->f_ops->fo_ioctl)(fp, RNDGETSRCNAME, &rstnmbuf);
    109 		if (ret != 0)
    110 			return ret;
    111 
    112 		rndsource_to_rndsource50(&rstnmbuf.source, &rstnm50->source);
    113 
    114 		break;
    115 	}
    116 
    117 	default:
    118 		return ENOTTY;
    119 	}
    120 
    121 	return ret;
    122 }
    123 
    124 void
    125 rndpseudo_50_init(void)
    126 {
    127 
    128 	MODULE_HOOK_SET(rnd_ioctl_50_hook, "rnd_50", compat_50_rnd_ioctl);
    129 }
    130 
    131 void
    132 rndpseudo_50_fini(void)
    133 {
    134 
    135 	MODULE_HOOK_UNSET(rnd_ioctl_50_hook);
    136 }
    137