1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * 9P protocol definitions.
4 *
5 * Copyright (C) 2005 by Latchesar Ionkov <lucho@ionkov.net>
6 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
7 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
8 */
9
10 #ifndef NET_9P_H
11 #define NET_9P_H
12
13 /**
14 * enum p9_debug_flags - bits for mount time debug parameter
15 * @P9_DEBUG_ERROR: more verbose error messages including original error string
16 * @P9_DEBUG_9P: 9P protocol tracing
17 * @P9_DEBUG_VFS: VFS API tracing
18 * @P9_DEBUG_CONV: protocol conversion tracing
19 * @P9_DEBUG_MUX: trace management of concurrent transactions
20 * @P9_DEBUG_TRANS: transport tracing
21 * @P9_DEBUG_SLABS: memory management tracing
22 * @P9_DEBUG_FCALL: verbose dump of protocol messages
23 * @P9_DEBUG_FID: fid allocation/deallocation tracking
24 * @P9_DEBUG_PKT: packet marshalling/unmarshalling
25 * @P9_DEBUG_FSC: FS-cache tracing
26 * @P9_DEBUG_VPKT: Verbose packet debugging (full packet dump)
27 *
28 * These flags are passed at mount time to turn on various levels of
29 * verbosity and tracing which will be output to the system logs.
30 */
31
32 enum p9_debug_flags {
33 P9_DEBUG_ERROR = (1<<0),
34 P9_DEBUG_9P = (1<<2),
35 P9_DEBUG_VFS = (1<<3),
36 P9_DEBUG_CONV = (1<<4),
37 P9_DEBUG_MUX = (1<<5),
38 P9_DEBUG_TRANS = (1<<6),
39 P9_DEBUG_SLABS = (1<<7),
40 P9_DEBUG_FCALL = (1<<8),
41 P9_DEBUG_FID = (1<<9),
42 P9_DEBUG_PKT = (1<<10),
43 P9_DEBUG_FSC = (1<<11),
44 P9_DEBUG_VPKT = (1<<12),
45 P9_DEBUG_CACHE = (1<<13),
46 P9_DEBUG_MMAP = (1<<14),
47 };
48
49 #ifdef CONFIG_NET_9P_DEBUG
50 extern unsigned int p9_debug_level;
51 __printf(3, 4)
52 void _p9_debug(enum p9_debug_flags level, const char *func,
53 const char *fmt, ...);
54 #define p9_debug(level, fmt, ...) \
55 _p9_debug(level, __func__, fmt, ##__VA_ARGS__)
56 #else
57 #define p9_debug(level, fmt, ...) \
58 no_printk(fmt, ##__VA_ARGS__)
59 #endif
60
61 /**
62 * enum p9_msg_t - 9P message types
63 * @P9_TLERROR: not used
64 * @P9_RLERROR: response for any failed request for 9P2000.L
65 * @P9_TSTATFS: file system status request
66 * @P9_RSTATFS: file system status response
67 * @P9_TSYMLINK: make symlink request
68 * @P9_RSYMLINK: make symlink response
69 * @P9_TMKNOD: create a special file object request
70 * @P9_RMKNOD: create a special file object response
71 * @P9_TLCREATE: prepare a handle for I/O on an new file for 9P2000.L
72 * @P9_RLCREATE: response with file access information for 9P2000.L
73 * @P9_TRENAME: rename request
74 * @P9_RRENAME: rename response
75 * @P9_TMKDIR: create a directory request
76 * @P9_RMKDIR: create a directory response
77 * @P9_TVERSION: version handshake request
78 * @P9_RVERSION: version handshake response
79 * @P9_TAUTH: request to establish authentication channel
80 * @P9_RAUTH: response with authentication information
81 * @P9_TATTACH: establish user access to file service
82 * @P9_RATTACH: response with top level handle to file hierarchy
83 * @P9_TERROR: not used
84 * @P9_RERROR: response for any failed request
85 * @P9_TFLUSH: request to abort a previous request
86 * @P9_RFLUSH: response when previous request has been cancelled
87 * @P9_TWALK: descend a directory hierarchy
88 * @P9_RWALK: response with new handle for position within hierarchy
89 * @P9_TOPEN: prepare a handle for I/O on an existing file
90 * @P9_ROPEN: response with file access information
91 * @P9_TCREATE: prepare a handle for I/O on a new file
92 * @P9_RCREATE: response with file access information
93 * @P9_TREAD: request to transfer data from a file or directory
94 * @P9_RREAD: response with data requested
95 * @P9_TWRITE: reuqest to transfer data to a file
96 * @P9_RWRITE: response with out much data was transferred to file
97 * @P9_TCLUNK: forget about a handle to an entity within the file system
98 * @P9_RCLUNK: response when server has forgotten about the handle
99 * @P9_TREMOVE: request to remove an entity from the hierarchy
100 * @P9_RREMOVE: response when server has removed the entity
101 * @P9_TSTAT: request file entity attributes
102 * @P9_RSTAT: response with file entity attributes
103 * @P9_TWSTAT: request to update file entity attributes
104 * @P9_RWSTAT: response when file entity attributes are updated
105 *
106 * There are 14 basic operations in 9P2000, paired as
107 * requests and responses. The one special case is ERROR
108 * as there is no @P9_TERROR request for clients to transmit to
109 * the server, but the server may respond to any other request
110 * with an @P9_RERROR.
111 *
112 * See Also: http://plan9.bell-labs.com/sys/man/5/INDEX.html
113 */
114
115 enum p9_msg_t {
116 P9_TLERROR = 6,
117 P9_RLERROR,
118 P9_TSTATFS = 8,
119 P9_RSTATFS,
120 P9_TLOPEN = 12,
121 P9_RLOPEN,
122 P9_TLCREATE = 14,
123 P9_RLCREATE,
124 P9_TSYMLINK = 16,
125 P9_RSYMLINK,
126 P9_TMKNOD = 18,
127 P9_RMKNOD,
128 P9_TRENAME = 20,
129 P9_RRENAME,
130 P9_TREADLINK = 22,
131 P9_RREADLINK,
132 P9_TGETATTR = 24,
133 P9_RGETATTR,
134 P9_TSETATTR = 26,
135 P9_RSETATTR,
136 P9_TXATTRWALK = 30,
137 P9_RXATTRWALK,
138 P9_TXATTRCREATE = 32,
139 P9_RXATTRCREATE,
140 P9_TREADDIR = 40,
141 P9_RREADDIR,
142 P9_TFSYNC = 50,
143 P9_RFSYNC,
144 P9_TLOCK = 52,
145 P9_RLOCK,
146 P9_TGETLOCK = 54,
147 P9_RGETLOCK,
148 P9_TLINK = 70,
149 P9_RLINK,
150 P9_TMKDIR = 72,
151 P9_RMKDIR,
152 P9_TRENAMEAT = 74,
153 P9_RRENAMEAT,
154 P9_TUNLINKAT = 76,
155 P9_RUNLINKAT,
156 P9_TVERSION = 100,
157 P9_RVERSION,
158 P9_TAUTH = 102,
159 P9_RAUTH,
160 P9_TATTACH = 104,
161 P9_RATTACH,
162 P9_TERROR = 106,
163 P9_RERROR,
164 P9_TFLUSH = 108,
165 P9_RFLUSH,
166 P9_TWALK = 110,
167 P9_RWALK,
168 P9_TOPEN = 112,
169 P9_ROPEN,
170 P9_TCREATE = 114,
171 P9_RCREATE,
172 P9_TREAD = 116,
173 P9_RREAD,
174 P9_TWRITE = 118,
175 P9_RWRITE,
176 P9_TCLUNK = 120,
177 P9_RCLUNK,
178 P9_TREMOVE = 122,
179 P9_RREMOVE,
180 P9_TSTAT = 124,
181 P9_RSTAT,
182 P9_TWSTAT = 126,
183 P9_RWSTAT,
184 };
185
186 /**
187 * enum p9_open_mode_t - 9P open modes
188 * @P9_OREAD: open file for reading only
189 * @P9_OWRITE: open file for writing only
190 * @P9_ORDWR: open file for reading or writing
191 * @P9_OEXEC: open file for execution
192 * @P9_OTRUNC: truncate file to zero-length before opening it
193 * @P9_OREXEC: close the file when an exec(2) system call is made
194 * @P9_ORCLOSE: remove the file when the file is closed
195 * @P9_OAPPEND: open the file and seek to the end
196 * @P9_OEXCL: only create a file, do not open it
197 *
198 * 9P open modes differ slightly from Posix standard modes.
199 * In particular, there are extra modes which specify different
200 * semantic behaviors than may be available on standard Posix
201 * systems. For example, @P9_OREXEC and @P9_ORCLOSE are modes that
202 * most likely will not be issued from the Linux VFS client, but may
203 * be supported by servers.
204 *
205 * See Also: http://plan9.bell-labs.com/magic/man2html/2/open
206 */
207
208 enum p9_open_mode_t {
209 P9_OREAD = 0x00,
210 P9_OWRITE = 0x01,
211 P9_ORDWR = 0x02,
212 P9_OEXEC = 0x03,
213 P9_OTRUNC = 0x10,
214 P9_OREXEC = 0x20,
215 P9_ORCLOSE = 0x40,
216 P9_OAPPEND = 0x80,
217 P9_OEXCL = 0x1000,
218 P9L_MODE_MASK = 0x1FFF, /* don't send anything under this to server */
219 P9L_DIRECT = 0x2000, /* cache disabled */
220 P9L_NOWRITECACHE = 0x4000, /* no write caching */
221 P9L_LOOSE = 0x8000, /* loose cache */
222 };
223
224 /**
225 * enum p9_perm_t - 9P permissions
226 * @P9_DMDIR: mode bit for directories
227 * @P9_DMAPPEND: mode bit for is append-only
228 * @P9_DMEXCL: mode bit for excluse use (only one open handle allowed)
229 * @P9_DMMOUNT: mode bit for mount points
230 * @P9_DMAUTH: mode bit for authentication file
231 * @P9_DMTMP: mode bit for non-backed-up files
232 * @P9_DMSYMLINK: mode bit for symbolic links (9P2000.u)
233 * @P9_DMLINK: mode bit for hard-link (9P2000.u)
234 * @P9_DMDEVICE: mode bit for device files (9P2000.u)
235 * @P9_DMNAMEDPIPE: mode bit for named pipe (9P2000.u)
236 * @P9_DMSOCKET: mode bit for socket (9P2000.u)
237 * @P9_DMSETUID: mode bit for setuid (9P2000.u)
238 * @P9_DMSETGID: mode bit for setgid (9P2000.u)
239 * @P9_DMSETVTX: mode bit for sticky bit (9P2000.u)
240 *
241 * 9P permissions differ slightly from Posix standard modes.
242 *
243 * See Also: http://plan9.bell-labs.com/magic/man2html/2/stat
244 */
245 enum p9_perm_t {
246 P9_DMDIR = 0x80000000,
247 P9_DMAPPEND = 0x40000000,
248 P9_DMEXCL = 0x20000000,
249 P9_DMMOUNT = 0x10000000,
250 P9_DMAUTH = 0x08000000,
251 P9_DMTMP = 0x04000000,
252 /* 9P2000.u extensions */
253 P9_DMSYMLINK = 0x02000000,
254 P9_DMLINK = 0x01000000,
255 P9_DMDEVICE = 0x00800000,
256 P9_DMNAMEDPIPE = 0x00200000,
257 P9_DMSOCKET = 0x00100000,
258 P9_DMSETUID = 0x00080000,
259 P9_DMSETGID = 0x00040000,
260 P9_DMSETVTX = 0x00010000,
261 };
262
263 /* 9p2000.L open flags */
264 #define P9_DOTL_RDONLY 00000000
265 #define P9_DOTL_WRONLY 00000001
266 #define P9_DOTL_RDWR 00000002
267 #define P9_DOTL_NOACCESS 00000003
268 #define P9_DOTL_CREATE 00000100
269 #define P9_DOTL_EXCL 00000200
270 #define P9_DOTL_NOCTTY 00000400
271 #define P9_DOTL_TRUNC 00001000
272 #define P9_DOTL_APPEND 00002000
273 #define P9_DOTL_NONBLOCK 00004000
274 #define P9_DOTL_DSYNC 00010000
275 #define P9_DOTL_FASYNC 00020000
276 #define P9_DOTL_DIRECT 00040000
277 #define P9_DOTL_LARGEFILE 00100000
278 #define P9_DOTL_DIRECTORY 00200000
279 #define P9_DOTL_NOFOLLOW 00400000
280 #define P9_DOTL_NOATIME 01000000
281 #define P9_DOTL_CLOEXEC 02000000
282 #define P9_DOTL_SYNC 04000000
283
284 /* 9p2000.L at flags */
285 #define P9_DOTL_AT_REMOVEDIR 0x200
286
287 /* 9p2000.L lock type */
288 #define P9_LOCK_TYPE_RDLCK 0
289 #define P9_LOCK_TYPE_WRLCK 1
290 #define P9_LOCK_TYPE_UNLCK 2
291
292 /**
293 * enum p9_qid_t - QID types
294 * @P9_QTDIR: directory
295 * @P9_QTAPPEND: append-only
296 * @P9_QTEXCL: excluse use (only one open handle allowed)
297 * @P9_QTMOUNT: mount points
298 * @P9_QTAUTH: authentication file
299 * @P9_QTTMP: non-backed-up files
300 * @P9_QTSYMLINK: symbolic links (9P2000.u)
301 * @P9_QTLINK: hard-link (9P2000.u)
302 * @P9_QTFILE: normal files
303 *
304 * QID types are a subset of permissions - they are primarily
305 * used to differentiate semantics for a file system entity via
306 * a jump-table. Their value is also the most significant 16 bits
307 * of the permission_t
308 *
309 * See Also: http://plan9.bell-labs.com/magic/man2html/2/stat
310 */
311 enum p9_qid_t {
312 P9_QTDIR = 0x80,
313 P9_QTAPPEND = 0x40,
314 P9_QTEXCL = 0x20,
315 P9_QTMOUNT = 0x10,
316 P9_QTAUTH = 0x08,
317 P9_QTTMP = 0x04,
318 P9_QTSYMLINK = 0x02,
319 P9_QTLINK = 0x01,
320 P9_QTFILE = 0x00,
321 };
322
323 /* 9P Magic Numbers */
324 #define P9_NOTAG ((u16)(~0))
325 #define P9_NOFID ((u32)(~0))
326 #define P9_MAXWELEM 16
327
328 /* Minimal header size: size[4] type[1] tag[2] */
329 #define P9_HDRSZ 7
330
331 /* ample room for Twrite/Rread header */
332 #define P9_IOHDRSZ 24
333
334 /* Room for readdir header */
335 #define P9_READDIRHDRSZ 24
336
337 /* size of header for zero copy read/write */
338 #define P9_ZC_HDR_SZ 4096
339
340 /* maximum length of an error string */
341 #define P9_ERRMAX 128
342
343 /**
344 * struct p9_qid - file system entity information
345 * @type: 8-bit type &p9_qid_t
346 * @version: 16-bit monotonically incrementing version number
347 * @path: 64-bit per-server-unique ID for a file system element
348 *
349 * qids are identifiers used by 9P servers to track file system
350 * entities. The type is used to differentiate semantics for operations
351 * on the entity (ie. read means something different on a directory than
352 * on a file). The path provides a server unique index for an entity
353 * (roughly analogous to an inode number), while the version is updated
354 * every time a file is modified and can be used to maintain cache
355 * coherency between clients and serves.
356 * Servers will often differentiate purely synthetic entities by setting
357 * their version to 0, signaling that they should never be cached and
358 * should be accessed synchronously.
359 *
360 * See Also://plan9.bell-labs.com/magic/man2html/2/stat
361 */
362
363 struct p9_qid {
364 u8 type;
365 u32 version;
366 u64 path;
367 };
368
369 /**
370 * struct p9_wstat - file system metadata information
371 * @size: length prefix for this stat structure instance
372 * @type: the type of the server (equivalent to a major number)
373 * @dev: the sub-type of the server (equivalent to a minor number)
374 * @qid: unique id from the server of type &p9_qid
375 * @mode: Plan 9 format permissions of type &p9_perm_t
376 * @atime: Last access/read time
377 * @mtime: Last modify/write time
378 * @length: file length
379 * @name: last element of path (aka filename)
380 * @uid: owner name
381 * @gid: group owner
382 * @muid: last modifier
383 * @extension: area used to encode extended UNIX support
384 * @n_uid: numeric user id of owner (part of 9p2000.u extension)
385 * @n_gid: numeric group id (part of 9p2000.u extension)
386 * @n_muid: numeric user id of laster modifier (part of 9p2000.u extension)
387 *
388 * See Also: http://plan9.bell-labs.com/magic/man2html/2/stat
389 */
390
391 struct p9_wstat {
392 u16 size;
393 u16 type;
394 u32 dev;
395 struct p9_qid qid;
396 u32 mode;
397 u32 atime;
398 u32 mtime;
399 u64 length;
400 const char *name;
401 const char *uid;
402 const char *gid;
403 const char *muid;
404 char *extension; /* 9p2000.u extensions */
405 kuid_t n_uid; /* 9p2000.u extensions */
406 kgid_t n_gid; /* 9p2000.u extensions */
407 kuid_t n_muid; /* 9p2000.u extensions */
408 };
409
410 struct p9_stat_dotl {
411 u64 st_result_mask;
412 struct p9_qid qid;
413 u32 st_mode;
414 kuid_t st_uid;
415 kgid_t st_gid;
416 u64 st_nlink;
417 u64 st_rdev;
418 u64 st_size;
419 u64 st_blksize;
420 u64 st_blocks;
421 u64 st_atime_sec;
422 u64 st_atime_nsec;
423 u64 st_mtime_sec;
424 u64 st_mtime_nsec;
425 u64 st_ctime_sec;
426 u64 st_ctime_nsec;
427 u64 st_btime_sec;
428 u64 st_btime_nsec;
429 u64 st_gen;
430 u64 st_data_version;
431 };
432
433 #define P9_STATS_MODE 0x00000001ULL
434 #define P9_STATS_NLINK 0x00000002ULL
435 #define P9_STATS_UID 0x00000004ULL
436 #define P9_STATS_GID 0x00000008ULL
437 #define P9_STATS_RDEV 0x00000010ULL
438 #define P9_STATS_ATIME 0x00000020ULL
439 #define P9_STATS_MTIME 0x00000040ULL
440 #define P9_STATS_CTIME 0x00000080ULL
441 #define P9_STATS_INO 0x00000100ULL
442 #define P9_STATS_SIZE 0x00000200ULL
443 #define P9_STATS_BLOCKS 0x00000400ULL
444
445 #define P9_STATS_BTIME 0x00000800ULL
446 #define P9_STATS_GEN 0x00001000ULL
447 #define P9_STATS_DATA_VERSION 0x00002000ULL
448
449 #define P9_STATS_BASIC 0x000007ffULL /* Mask for fields up to BLOCKS */
450 #define P9_STATS_ALL 0x00003fffULL /* Mask for All fields above */
451
452 /**
453 * struct p9_iattr_dotl - P9 inode attribute for setattr
454 * @valid: bitfield specifying which fields are valid
455 * same as in struct iattr
456 * @mode: File permission bits
457 * @uid: user id of owner
458 * @gid: group id
459 * @size: File size
460 * @atime_sec: Last access time, seconds
461 * @atime_nsec: Last access time, nanoseconds
462 * @mtime_sec: Last modification time, seconds
463 * @mtime_nsec: Last modification time, nanoseconds
464 */
465
466 struct p9_iattr_dotl {
467 u32 valid;
468 u32 mode;
469 kuid_t uid;
470 kgid_t gid;
471 u64 size;
472 u64 atime_sec;
473 u64 atime_nsec;
474 u64 mtime_sec;
475 u64 mtime_nsec;
476 };
477
478 #define P9_LOCK_SUCCESS 0
479 #define P9_LOCK_BLOCKED 1
480 #define P9_LOCK_ERROR 2
481 #define P9_LOCK_GRACE 3
482
483 #define P9_LOCK_FLAGS_BLOCK 1
484 #define P9_LOCK_FLAGS_RECLAIM 2
485
486 /* struct p9_flock: POSIX lock structure
487 * @type - type of lock
488 * @flags - lock flags
489 * @start - starting offset of the lock
490 * @length - number of bytes
491 * @proc_id - process id which wants to take lock
492 * @client_id - client id
493 */
494
495 struct p9_flock {
496 u8 type;
497 u32 flags;
498 u64 start;
499 u64 length;
500 u32 proc_id;
501 char *client_id;
502 };
503
504 /* struct p9_getlock: getlock structure
505 * @type - type of lock
506 * @start - starting offset of the lock
507 * @length - number of bytes
508 * @proc_id - process id which wants to take lock
509 * @client_id - client id
510 */
511
512 struct p9_getlock {
513 u8 type;
514 u64 start;
515 u64 length;
516 u32 proc_id;
517 char *client_id;
518 };
519
520 struct p9_rstatfs {
521 u32 type;
522 u32 bsize;
523 u64 blocks;
524 u64 bfree;
525 u64 bavail;
526 u64 files;
527 u64 ffree;
528 u64 fsid;
529 u32 namelen;
530 };
531
532 /**
533 * struct p9_fcall - primary packet structure
534 * @size: prefixed length of the structure
535 * @id: protocol operating identifier of type &p9_msg_t
536 * @tag: transaction id of the request
537 * @offset: used by marshalling routines to track current position in buffer
538 * @capacity: used by marshalling routines to track total malloc'd capacity
539 * @sdata: payload
540 * @zc: whether zero-copy is used
541 *
542 * &p9_fcall represents the structure for all 9P RPC
543 * transactions. Requests are packaged into fcalls, and reponses
544 * must be extracted from them.
545 *
546 * See Also: http://plan9.bell-labs.com/magic/man2html/2/fcall
547 */
548
549 struct p9_fcall {
550 u32 size;
551 u8 id;
552 u16 tag;
553
554 size_t offset;
555 size_t capacity;
556
557 struct kmem_cache *cache;
558 u8 *sdata;
559 bool zc;
560 };
561
562 int p9_errstr2errno(char *errstr, int len);
563
564 int p9_error_init(void);
565 #endif /* NET_9P_H */
566
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