1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * Copyright (c) 2000 7 * Poul-Henning Kamp. All rights reserved. 8 * Copyright (c) 2002 9 * Dima Dorfman. All rights reserved. 10 * 11 * This code is derived from software donated to Berkeley by 12 * Jan-Simon Pendry. 13 * 14 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that the following conditions 16 * are met: 17 * 1. Redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer. 19 * 2. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * From: FreeBSD: src/sys/miscfs/kernfs/kernfs.h 1.14 35 */ 36 37 #ifndef _FS_DEVFS_DEVFS_H_ 38 #define _FS_DEVFS_DEVFS_H_ 39 40 #define DEVFS_MAGIC 0xdb0a087a 41 42 /* 43 * Identifiers. The ruleset and rule numbers are 16-bit values. The 44 * "rule ID" is a combination of the ruleset and rule number; it 45 * should be able to univocally describe a rule in the system. In 46 * this implementation, the upper 16 bits of the rule ID is the 47 * ruleset number; the lower 16 bits, the rule number within the 48 * aforementioned ruleset. 49 */ 50 typedef uint16_t devfs_rnum; 51 typedef uint16_t devfs_rsnum; 52 typedef uint32_t devfs_rid; 53 54 /* 55 * Identifier manipulators. 56 */ 57 #define rid2rsn(rid) ((rid) >> 16) 58 #define rid2rn(rid) ((rid) & 0xffff) 59 #define mkrid(rsn, rn) ((rn) | ((rsn) << 16)) 60 61 /* 62 * Plain DEVFS rule. This gets shared between kernel and userland 63 * verbatim, so it shouldn't contain any pointers or other kernel- or 64 * userland-specific values. 65 */ 66 struct devfs_rule { 67 uint32_t dr_magic; /* Magic number. */ 68 devfs_rid dr_id; /* Identifier. */ 69 70 /* 71 * Conditions under which this rule should be applied. These 72 * are ANDed together since OR can be simulated by using 73 * multiple rules. dr_icond determines which of the other 74 * variables we should process. 75 */ 76 int dr_icond; 77 #define DRC_DSWFLAGS 0x001 78 #define DRC_PATHPTRN 0x002 79 int dr_dswflags; /* cdevsw flags to match. */ 80 #define DEVFS_MAXPTRNLEN 200 81 char dr_pathptrn[DEVFS_MAXPTRNLEN]; /* Pattern to match path. */ 82 83 /* 84 * Things to change. dr_iacts determines which of the other 85 * variables we should process. 86 */ 87 int dr_iacts; 88 #define DRA_BACTS 0x001 89 #define DRA_UID 0x002 90 #define DRA_GID 0x004 91 #define DRA_MODE 0x008 92 #define DRA_INCSET 0x010 93 int dr_bacts; /* Boolean (on/off) action. */ 94 #define DRB_HIDE 0x001 /* Hide entry (DE_WHITEOUT). */ 95 #define DRB_UNHIDE 0x002 /* Unhide entry. */ 96 uid_t dr_uid; 97 gid_t dr_gid; 98 mode_t dr_mode; 99 devfs_rsnum dr_incset; /* Included ruleset. */ 100 }; 101 102 /* 103 * Rule-related ioctls. 104 */ 105 #define DEVFSIO_RADD _IOWR('D', 0, struct devfs_rule) 106 #define DEVFSIO_RDEL _IOW('D', 1, devfs_rid) 107 #define DEVFSIO_RAPPLY _IOW('D', 2, struct devfs_rule) 108 #define DEVFSIO_RAPPLYID _IOW('D', 3, devfs_rid) 109 #define DEVFSIO_RGETNEXT _IOWR('D', 4, struct devfs_rule) 110 111 #define DEVFSIO_SUSE _IOW('D', 10, devfs_rsnum) 112 #define DEVFSIO_SAPPLY _IOW('D', 11, devfs_rsnum) 113 #define DEVFSIO_SGETNEXT _IOWR('D', 12, devfs_rsnum) 114 115 /* XXX: DEVFSIO_RS_GET_INFO for refcount, active if any, etc. */ 116 117 #ifdef _KERNEL 118 119 #ifdef MALLOC_DECLARE 120 MALLOC_DECLARE(M_DEVFS); 121 #endif 122 123 #endif /* _KERNEL */ 124 125 struct componentname; 126 127 TAILQ_HEAD(devfs_dlist_head, devfs_dirent); 128 129 struct devfs_dirent { 130 struct cdev_priv *de_cdp; 131 int de_inode; 132 int de_flags; 133 #define DE_WHITEOUT 0x01 134 #define DE_DOT 0x02 135 #define DE_DOTDOT 0x04 136 #define DE_DOOMED 0x08 137 #define DE_COVERED 0x10 138 #define DE_USER 0x20 139 int de_holdcnt; 140 struct dirent *de_dirent; 141 TAILQ_ENTRY(devfs_dirent) de_list; 142 struct devfs_dlist_head de_dlist; 143 struct devfs_dirent *de_dir; 144 int de_links; 145 mode_t de_mode; 146 uid_t de_uid; 147 gid_t de_gid; 148 struct label *de_label; 149 struct timespec de_atime; 150 struct timespec de_mtime; 151 struct timespec de_ctime; 152 struct vnode *de_vnode; 153 char *de_symlink; 154 int de_usecount; 155 }; 156 157 #include <sys/_lock.h> 158 #include <sys/_sx.h> 159 160 struct devfs_mount { 161 u_int dm_idx; 162 struct mount *dm_mount; 163 struct devfs_dirent *dm_rootdir; 164 unsigned dm_generation; 165 int dm_holdcnt; 166 struct sx dm_lock; 167 devfs_rsnum dm_ruleset; 168 }; 169 170 #define DEVFS_ROOTINO 2 171 172 #ifdef _KERNEL 173 174 extern unsigned devfs_rule_depth; 175 176 #define VFSTODEVFS(mp) ((struct devfs_mount *)((mp)->mnt_data)) 177 178 #define DEVFS_DE_HOLD(de) ((de)->de_holdcnt++) 179 #define DEVFS_DE_DROP(de) (--(de)->de_holdcnt == 0) 180 181 #define DEVFS_DMP_HOLD(dmp) ((dmp)->dm_holdcnt++) 182 #define DEVFS_DMP_DROP(dmp) (--(dmp)->dm_holdcnt == 0) 183 184 #define DEVFS_DEL_NORECURSE 0x01 185 186 void devfs_rules_apply(struct devfs_mount *, struct devfs_dirent *); 187 void devfs_rules_cleanup(struct devfs_mount *); 188 int devfs_rules_ioctl(struct devfs_mount *, u_long, caddr_t, 189 struct thread *); 190 void devfs_ruleset_set(devfs_rsnum rsnum, struct devfs_mount *dm); 191 void devfs_ruleset_apply(struct devfs_mount *dm); 192 int devfs_allocv(struct devfs_dirent *, struct mount *, int, 193 struct vnode **); 194 char *devfs_fqpn(char *, struct devfs_mount *, struct devfs_dirent *, 195 struct componentname *); 196 void devfs_delete(struct devfs_mount *, struct devfs_dirent *, int); 197 void devfs_dirent_free(struct devfs_dirent *); 198 int devfs_populate_needed(struct devfs_mount *dm); 199 void devfs_populate(struct devfs_mount *); 200 void devfs_cleanup(struct devfs_mount *); 201 void devfs_unmount_final(struct devfs_mount *); 202 struct devfs_dirent *devfs_newdirent(char *, int); 203 struct devfs_dirent *devfs_parent_dirent(struct devfs_dirent *); 204 struct devfs_dirent *devfs_vmkdir(struct devfs_mount *, char *, int, 205 struct devfs_dirent *, u_int); 206 struct devfs_dirent *devfs_find(struct devfs_dirent *, const char *, int, 207 int); 208 209 void devfs_ctty_ref(struct vnode *); 210 void devfs_ctty_unref(struct vnode *); 211 int devfs_usecount(struct vnode *); 212 213 #endif /* _KERNEL */ 214 215 #endif /* !_FS_DEVFS_DEVFS_H_ */ 216