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
ptmget_to_ptmget60(struct ptmget * pg,struct compat_60_ptmget * pg60)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
compat_60_ptmget_ioctl(dev_t dev,u_long cmd,void * data,int flag,struct lwp * l)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
compat_60_ttioctl(struct tty * tp,u_long cmd,void * data,int flag,struct lwp * l)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
compat_60_ptmioctl(dev_t dev,u_long cmd,void * data,int flag,struct lwp * l)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
kern_tty_60_init(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
kern_tty_60_fini(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