1 /* $NetBSD: tty_60.c,v 1.10 2020/06/24 17:47:52 jdolecek 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 1.10 2020/06/24 17:47:52 jdolecek 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 #include <sys/kmem.h> 46 47 #include <sys/tty.h> 48 49 #include <compat/common/compat_mod.h> 50 #include <compat/sys/ttycom.h> 51 52 /* convert struct ptmget to struct compat_60_ptmget */ 53 static int 54 ptmget_to_ptmget60(struct ptmget *pg, struct compat_60_ptmget *pg60) 55 { 56 memset(pg60, 0, sizeof(*pg60)); 57 pg60->cfd = pg->cfd; 58 pg60->sfd = pg->sfd; 59 strlcpy(pg60->cn, pg->cn, sizeof(pg60->cn)); 60 strlcpy(pg60->sn, pg->sn, sizeof(pg60->sn)); 61 if (strlen(pg->cn) >= sizeof(pg60->cn) 62 || strlen(pg->sn) >= sizeof(pg60->sn)) 63 return E2BIG; 64 return 0; 65 } 66 67 /* Helper for compat ioctls that use struct compat_60_ptmget. */ 68 static int 69 compat_60_ptmget_ioctl(dev_t dev, u_long cmd, void *data, int flag, 70 struct lwp *l) 71 { 72 int ret; 73 u_long newcmd; 74 struct ptmget *pg; 75 const struct cdevsw *cd = cdevsw_lookup(dev); 76 77 if (cd == NULL || cd->d_ioctl == NULL) 78 return ENXIO; 79 80 switch (cmd) { 81 case COMPAT_60_TIOCPTMGET: newcmd = TIOCPTMGET; break; 82 case COMPAT_60_TIOCPTSNAME: newcmd = TIOCPTSNAME; break; 83 default: return ENOTTY; 84 } 85 86 pg = kmem_alloc(sizeof(*pg), KM_SLEEP); 87 88 ret = (cd->d_ioctl)(dev, newcmd, pg, flag, l); 89 if (ret != 0) 90 goto out; 91 92 ret = ptmget_to_ptmget60(pg, data); 93 94 out: 95 kmem_free(pg, sizeof(*pg)); 96 return ret; 97 } 98 99 /* 100 * COMPAT_60 versions of ttioctl and ptmioctl. 101 */ 102 int 103 compat_60_ttioctl(struct tty *tp, u_long cmd, void *data, int flag, 104 struct lwp *l) 105 { 106 107 switch (cmd) { 108 case COMPAT_60_TIOCPTMGET: 109 case COMPAT_60_TIOCPTSNAME: 110 return compat_60_ptmget_ioctl(tp->t_dev, cmd, data, flag, l); 111 default: 112 return EPASSTHROUGH; 113 } 114 } 115 116 int 117 compat_60_ptmioctl(dev_t dev, u_long cmd, void *data, int flag, 118 struct lwp *l) 119 { 120 121 switch (cmd) { 122 case COMPAT_60_TIOCPTMGET: 123 return compat_60_ptmget_ioctl(dev, cmd, data, flag, l); 124 default: 125 return EPASSTHROUGH; 126 } 127 } 128 129 void 130 kern_tty_60_init(void) 131 { 132 133 MODULE_HOOK_SET(tty_ttioctl_60_hook, compat_60_ttioctl); 134 MODULE_HOOK_SET(tty_ptmioctl_60_hook, compat_60_ptmioctl); 135 } 136 137 void 138 kern_tty_60_fini(void) 139 { 140 MODULE_HOOK_UNSET(tty_ttioctl_60_hook); 141 MODULE_HOOK_UNSET(tty_ptmioctl_60_hook); 142 } 143