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tty_60.c revision 1.9 
      1 /*	$NetBSD: tty_60.c,v 1.9 2019/12/12 02:15:42 pgoyette 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 1.9 2019/12/12 02:15:42 pgoyette Exp $");
     34 
     35 #if defined(_KERNEL_OPT)
     36 #include "opt_compat_netbsd.h"
     37 #endif
     38 
     39 #include <sys/types.h>
     40 
     41 #include <sys/conf.h>
     42 #include <sys/errno.h>
     43 #include <sys/systm.h>
     44 #include <sys/compat_stub.h>
     45 
     46 #include <sys/tty.h>
     47 
     48 #include <compat/common/compat_mod.h>
     49 #include <compat/sys/ttycom.h>
     50 
     51 /* convert struct ptmget to struct compat_60_ptmget */
     52 static int
     53 ptmget_to_ptmget60(struct ptmget *pg, struct compat_60_ptmget *pg60)
     54 {
     55 	memset(pg60, 0, sizeof(*pg60));
     56 	pg60->cfd = pg->cfd;
     57 	pg60->sfd = pg->sfd;
     58 	strlcpy(pg60->cn, pg->cn, sizeof(pg60->cn));
     59 	strlcpy(pg60->sn, pg->sn, sizeof(pg60->sn));
     60 	if (strlen(pg->cn) >= sizeof(pg60->cn)
     61 	    || strlen(pg->sn) >= sizeof(pg60->sn))
     62 		return E2BIG;
     63 	return 0;
     64 }
     65 
     66 /* Helper for compat ioctls that use struct compat_60_ptmget. */
     67 static int
     68 compat_60_ptmget_ioctl(dev_t dev, u_long cmd, void *data, int flag,
     69 	struct lwp *l)
     70 {
     71 	int ret;
     72 	u_long newcmd;
     73 	struct ptmget pg;
     74 	const struct cdevsw *cd = cdevsw_lookup(dev);
     75 
     76 	if (cd == NULL || cd->d_ioctl == NULL)
     77 		return ENXIO;
     78 
     79 	switch (cmd) {
     80 	case COMPAT_60_TIOCPTMGET:  newcmd = TIOCPTMGET; break;
     81 	case COMPAT_60_TIOCPTSNAME: newcmd = TIOCPTSNAME; break;
     82 	default: return ENOTTY;
     83 	}
     84 
     85 	ret = (cd->d_ioctl)(dev, newcmd, &pg, flag, l);
     86 	if (ret != 0)
     87 		return ret;
     88 	ret = ptmget_to_ptmget60(&pg, data);
     89 	return ret;
     90 }
     91 
     92 /*
     93  * COMPAT_60 versions of ttioctl and ptmioctl.
     94  */
     95 int
     96 compat_60_ttioctl(struct tty *tp, u_long cmd, void *data, int flag,
     97 	struct lwp *l)
     98 {
     99 
    100 	switch (cmd) {
    101 	case COMPAT_60_TIOCPTMGET:
    102 	case COMPAT_60_TIOCPTSNAME:
    103 		return compat_60_ptmget_ioctl(tp->t_dev, cmd, data, flag, l);
    104 	default:
    105 		return EPASSTHROUGH;
    106 	}
    107 }
    108 
    109 int
    110 compat_60_ptmioctl(dev_t dev, u_long cmd, void *data, int flag,
    111     struct lwp *l)
    112 {
    113 
    114 	switch (cmd) {
    115 	case COMPAT_60_TIOCPTMGET:
    116 		return compat_60_ptmget_ioctl(dev, cmd, data, flag, l);
    117 	default:
    118 		return EPASSTHROUGH;
    119 	}
    120 }
    121 
    122 void
    123 kern_tty_60_init(void)
    124 {
    125 
    126 	MODULE_HOOK_SET(tty_ttioctl_60_hook, compat_60_ttioctl);
    127 	MODULE_HOOK_SET(tty_ptmioctl_60_hook, compat_60_ptmioctl);
    128 }
    129 
    130 void
    131 kern_tty_60_fini(void)
    132 {
    133 	MODULE_HOOK_UNSET(tty_ttioctl_60_hook);
    134 	MODULE_HOOK_UNSET(tty_ptmioctl_60_hook);
    135 }
    136