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      1 /*	$NetBSD: tty_60.c,v 1.11 2021/07/21 06:35:44 skrll Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2012 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Alan Barrett
      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: tty_60.c,v 1.11 2021/07/21 06:35:44 skrll Exp $");
     34 
     35 #if defined(_KERNEL_OPT)
     36 #include "opt_compat_netbsd.h"
     37 #endif
     38 
     39 #include <sys/param.h>
     40 #include <sys/types.h>
     41 
     42 #include <sys/conf.h>
     43 #include <sys/errno.h>
     44 #include <sys/systm.h>
     45 #include <sys/compat_stub.h>
     46 #include <sys/kmem.h>
     47 
     48 #include <sys/tty.h>
     49 
     50 #include <compat/common/compat_mod.h>
     51 #include <compat/sys/ttycom.h>
     52 
     53 /* convert struct ptmget to struct compat_60_ptmget */
     54 static int
     55 ptmget_to_ptmget60(struct ptmget *pg, struct compat_60_ptmget *pg60)
     56 {
     57 	memset(pg60, 0, sizeof(*pg60));
     58 	pg60->cfd = pg->cfd;
     59 	pg60->sfd = pg->sfd;
     60 	strlcpy(pg60->cn, pg->cn, sizeof(pg60->cn));
     61 	strlcpy(pg60->sn, pg->sn, sizeof(pg60->sn));
     62 	if (strlen(pg->cn) >= sizeof(pg60->cn)
     63 	    || strlen(pg->sn) >= sizeof(pg60->sn))
     64 		return E2BIG;
     65 	return 0;
     66 }
     67 
     68 /* Helper for compat ioctls that use struct compat_60_ptmget. */
     69 static int
     70 compat_60_ptmget_ioctl(dev_t dev, u_long cmd, void *data, int flag,
     71 	struct lwp *l)
     72 {
     73 	int ret;
     74 	u_long newcmd;
     75 	struct ptmget *pg;
     76 	const struct cdevsw *cd = cdevsw_lookup(dev);
     77 
     78 	if (cd == NULL || cd->d_ioctl == NULL)
     79 		return ENXIO;
     80 
     81 	switch (cmd) {
     82 	case COMPAT_60_TIOCPTMGET:  newcmd = TIOCPTMGET; break;
     83 	case COMPAT_60_TIOCPTSNAME: newcmd = TIOCPTSNAME; break;
     84 	default: return ENOTTY;
     85 	}
     86 
     87 	pg = kmem_alloc(sizeof(*pg), KM_SLEEP);
     88 
     89 	ret = (cd->d_ioctl)(dev, newcmd, pg, flag, l);
     90 	if (ret != 0)
     91 		goto out;
     92 
     93 	ret = ptmget_to_ptmget60(pg, data);
     94 
     95 out:
     96 	kmem_free(pg, sizeof(*pg));
     97 	return ret;
     98 }
     99 
    100 /*
    101  * COMPAT_60 versions of ttioctl and ptmioctl.
    102  */
    103 int
    104 compat_60_ttioctl(struct tty *tp, u_long cmd, void *data, int flag,
    105 	struct lwp *l)
    106 {
    107 
    108 	switch (cmd) {
    109 	case COMPAT_60_TIOCPTMGET:
    110 	case COMPAT_60_TIOCPTSNAME:
    111 		return compat_60_ptmget_ioctl(tp->t_dev, cmd, data, flag, l);
    112 	default:
    113 		return EPASSTHROUGH;
    114 	}
    115 }
    116 
    117 int
    118 compat_60_ptmioctl(dev_t dev, u_long cmd, void *data, int flag,
    119     struct lwp *l)
    120 {
    121 
    122 	switch (cmd) {
    123 	case COMPAT_60_TIOCPTMGET:
    124 		return compat_60_ptmget_ioctl(dev, cmd, data, flag, l);
    125 	default:
    126 		return EPASSTHROUGH;
    127 	}
    128 }
    129 
    130 void
    131 kern_tty_60_init(void)
    132 {
    133 
    134 	MODULE_HOOK_SET(tty_ttioctl_60_hook, compat_60_ttioctl);
    135 	MODULE_HOOK_SET(tty_ptmioctl_60_hook, compat_60_ptmioctl);
    136 }
    137 
    138 void
    139 kern_tty_60_fini(void)
    140 {
    141 	MODULE_HOOK_UNSET(tty_ttioctl_60_hook);
    142 	MODULE_HOOK_UNSET(tty_ptmioctl_60_hook);
    143 }
    144