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Commit | Line | Data |
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bd238fb4 LI |
1 | /* |
2 | * linux/fs/9p/trans_fd.c | |
3 | * | |
4 | * Fd transport layer. Includes deprecated socket layer. | |
5 | * | |
6 | * Copyright (C) 2006 by Russ Cox <rsc@swtch.com> | |
7 | * Copyright (C) 2004-2005 by Latchesar Ionkov <lucho@ionkov.net> | |
a80d923e | 8 | * Copyright (C) 2004-2007 by Eric Van Hensbergen <ericvh@gmail.com> |
bd238fb4 LI |
9 | * Copyright (C) 1997-2002 by Ron Minnich <rminnich@sarnoff.com> |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License version 2 | |
13 | * as published by the Free Software Foundation. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to: | |
22 | * Free Software Foundation | |
23 | * 51 Franklin Street, Fifth Floor | |
24 | * Boston, MA 02111-1301 USA | |
25 | * | |
26 | */ | |
27 | ||
28 | #include <linux/in.h> | |
29 | #include <linux/module.h> | |
30 | #include <linux/net.h> | |
31 | #include <linux/ipv6.h> | |
32 | #include <linux/errno.h> | |
33 | #include <linux/kernel.h> | |
34 | #include <linux/un.h> | |
35 | #include <linux/uaccess.h> | |
36 | #include <linux/inet.h> | |
37 | #include <linux/idr.h> | |
38 | #include <linux/file.h> | |
a80d923e | 39 | #include <linux/parser.h> |
bd238fb4 LI |
40 | #include <net/9p/9p.h> |
41 | #include <net/9p/transport.h> | |
42 | ||
43 | #define P9_PORT 564 | |
a80d923e EVH |
44 | #define MAX_SOCK_BUF (64*1024) |
45 | ||
46 | ||
47 | struct p9_fd_opts { | |
48 | int rfd; | |
49 | int wfd; | |
50 | u16 port; | |
51 | }; | |
bd238fb4 LI |
52 | |
53 | struct p9_trans_fd { | |
54 | struct file *rd; | |
55 | struct file *wr; | |
56 | }; | |
57 | ||
a80d923e EVH |
58 | /* |
59 | * Option Parsing (code inspired by NFS code) | |
60 | * - a little lazy - parse all fd-transport options | |
61 | */ | |
bd238fb4 | 62 | |
a80d923e EVH |
63 | enum { |
64 | /* Options that take integer arguments */ | |
65 | Opt_port, Opt_rfdno, Opt_wfdno, | |
66 | }; | |
bd238fb4 | 67 | |
a80d923e EVH |
68 | static match_table_t tokens = { |
69 | {Opt_port, "port=%u"}, | |
70 | {Opt_rfdno, "rfdno=%u"}, | |
71 | {Opt_wfdno, "wfdno=%u"}, | |
72 | }; | |
bd238fb4 | 73 | |
a80d923e EVH |
74 | /** |
75 | * v9fs_parse_options - parse mount options into session structure | |
76 | * @options: options string passed from mount | |
77 | * @v9ses: existing v9fs session information | |
78 | * | |
79 | */ | |
bd238fb4 | 80 | |
a80d923e | 81 | static void parse_opts(char *options, struct p9_fd_opts *opts) |
bd238fb4 | 82 | { |
a80d923e EVH |
83 | char *p; |
84 | substring_t args[MAX_OPT_ARGS]; | |
85 | int option; | |
86 | int ret; | |
bd238fb4 | 87 | |
a80d923e EVH |
88 | opts->port = P9_PORT; |
89 | opts->rfd = ~0; | |
90 | opts->wfd = ~0; | |
bd238fb4 | 91 | |
a80d923e EVH |
92 | if (!options) |
93 | return; | |
bd238fb4 | 94 | |
a80d923e EVH |
95 | while ((p = strsep(&options, ",")) != NULL) { |
96 | int token; | |
97 | if (!*p) | |
98 | continue; | |
99 | token = match_token(p, tokens, args); | |
100 | ret = match_int(&args[0], &option); | |
101 | if (ret < 0) { | |
102 | P9_DPRINTK(P9_DEBUG_ERROR, | |
103 | "integer field, but no integer?\n"); | |
104 | continue; | |
105 | } | |
106 | switch (token) { | |
107 | case Opt_port: | |
108 | opts->port = option; | |
109 | break; | |
110 | case Opt_rfdno: | |
111 | opts->rfd = option; | |
112 | break; | |
113 | case Opt_wfdno: | |
114 | opts->wfd = option; | |
115 | break; | |
116 | default: | |
117 | continue; | |
118 | } | |
bd238fb4 | 119 | } |
bd238fb4 | 120 | } |
bd238fb4 | 121 | |
a80d923e | 122 | static int p9_fd_open(struct p9_trans *trans, int rfd, int wfd) |
bd238fb4 | 123 | { |
a80d923e EVH |
124 | struct p9_trans_fd *ts = kmalloc(sizeof(struct p9_trans_fd), |
125 | GFP_KERNEL); | |
126 | if (!ts) | |
127 | return -ENOMEM; | |
bd238fb4 | 128 | |
a80d923e EVH |
129 | ts->rd = fget(rfd); |
130 | ts->wr = fget(wfd); | |
131 | if (!ts->rd || !ts->wr) { | |
132 | if (ts->rd) | |
133 | fput(ts->rd); | |
134 | if (ts->wr) | |
135 | fput(ts->wr); | |
136 | kfree(ts); | |
137 | return -EIO; | |
bd238fb4 LI |
138 | } |
139 | ||
a80d923e EVH |
140 | trans->priv = ts; |
141 | trans->status = Connected; | |
bd238fb4 | 142 | |
a80d923e | 143 | return 0; |
bd238fb4 | 144 | } |
bd238fb4 | 145 | |
a80d923e | 146 | static int p9_socket_open(struct p9_trans *trans, struct socket *csocket) |
bd238fb4 LI |
147 | { |
148 | int fd, ret; | |
149 | ||
150 | csocket->sk->sk_allocation = GFP_NOIO; | |
151 | fd = sock_map_fd(csocket); | |
152 | if (fd < 0) { | |
153 | P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to map fd\n"); | |
154 | return fd; | |
155 | } | |
156 | ||
157 | ret = p9_fd_open(trans, fd, fd); | |
158 | if (ret < 0) { | |
159 | P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to open fd\n"); | |
160 | sockfd_put(csocket); | |
161 | return ret; | |
162 | } | |
163 | ||
164 | ((struct p9_trans_fd *)trans->priv)->rd->f_flags |= O_NONBLOCK; | |
165 | ||
166 | return 0; | |
167 | } | |
168 | ||
bd238fb4 LI |
169 | /** |
170 | * p9_fd_read- read from a fd | |
171 | * @v9ses: session information | |
172 | * @v: buffer to receive data into | |
173 | * @len: size of receive buffer | |
174 | * | |
175 | */ | |
a80d923e | 176 | static int p9_fd_read(struct p9_trans *trans, void *v, int len) |
bd238fb4 LI |
177 | { |
178 | int ret; | |
179 | struct p9_trans_fd *ts = NULL; | |
180 | ||
181 | if (trans && trans->status != Disconnected) | |
182 | ts = trans->priv; | |
183 | ||
184 | if (!ts) | |
185 | return -EREMOTEIO; | |
186 | ||
187 | if (!(ts->rd->f_flags & O_NONBLOCK)) | |
188 | P9_DPRINTK(P9_DEBUG_ERROR, "blocking read ...\n"); | |
189 | ||
190 | ret = kernel_read(ts->rd, ts->rd->f_pos, v, len); | |
191 | if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) | |
192 | trans->status = Disconnected; | |
193 | return ret; | |
194 | } | |
195 | ||
196 | /** | |
197 | * p9_fd_write - write to a socket | |
198 | * @v9ses: session information | |
199 | * @v: buffer to send data from | |
200 | * @len: size of send buffer | |
201 | * | |
202 | */ | |
a80d923e | 203 | static int p9_fd_write(struct p9_trans *trans, void *v, int len) |
bd238fb4 LI |
204 | { |
205 | int ret; | |
206 | mm_segment_t oldfs; | |
207 | struct p9_trans_fd *ts = NULL; | |
208 | ||
209 | if (trans && trans->status != Disconnected) | |
210 | ts = trans->priv; | |
211 | ||
212 | if (!ts) | |
213 | return -EREMOTEIO; | |
214 | ||
215 | if (!(ts->wr->f_flags & O_NONBLOCK)) | |
216 | P9_DPRINTK(P9_DEBUG_ERROR, "blocking write ...\n"); | |
217 | ||
218 | oldfs = get_fs(); | |
219 | set_fs(get_ds()); | |
220 | /* The cast to a user pointer is valid due to the set_fs() */ | |
221 | ret = vfs_write(ts->wr, (void __user *)v, len, &ts->wr->f_pos); | |
222 | set_fs(oldfs); | |
223 | ||
224 | if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) | |
225 | trans->status = Disconnected; | |
226 | return ret; | |
227 | } | |
228 | ||
229 | static unsigned int | |
a80d923e | 230 | p9_fd_poll(struct p9_trans *trans, struct poll_table_struct *pt) |
bd238fb4 LI |
231 | { |
232 | int ret, n; | |
233 | struct p9_trans_fd *ts = NULL; | |
234 | mm_segment_t oldfs; | |
235 | ||
236 | if (trans && trans->status == Connected) | |
237 | ts = trans->priv; | |
238 | ||
239 | if (!ts) | |
240 | return -EREMOTEIO; | |
241 | ||
242 | if (!ts->rd->f_op || !ts->rd->f_op->poll) | |
243 | return -EIO; | |
244 | ||
245 | if (!ts->wr->f_op || !ts->wr->f_op->poll) | |
246 | return -EIO; | |
247 | ||
248 | oldfs = get_fs(); | |
249 | set_fs(get_ds()); | |
250 | ||
251 | ret = ts->rd->f_op->poll(ts->rd, pt); | |
252 | if (ret < 0) | |
253 | goto end; | |
254 | ||
255 | if (ts->rd != ts->wr) { | |
256 | n = ts->wr->f_op->poll(ts->wr, pt); | |
257 | if (n < 0) { | |
258 | ret = n; | |
259 | goto end; | |
260 | } | |
261 | ret = (ret & ~POLLOUT) | (n & ~POLLIN); | |
262 | } | |
263 | ||
264 | end: | |
265 | set_fs(oldfs); | |
266 | return ret; | |
267 | } | |
268 | ||
269 | /** | |
270 | * p9_sock_close - shutdown socket | |
271 | * @trans: private socket structure | |
272 | * | |
273 | */ | |
a80d923e | 274 | static void p9_fd_close(struct p9_trans *trans) |
bd238fb4 LI |
275 | { |
276 | struct p9_trans_fd *ts; | |
277 | ||
278 | if (!trans) | |
279 | return; | |
280 | ||
281 | ts = xchg(&trans->priv, NULL); | |
282 | ||
283 | if (!ts) | |
284 | return; | |
285 | ||
286 | trans->status = Disconnected; | |
287 | if (ts->rd) | |
288 | fput(ts->rd); | |
289 | if (ts->wr) | |
290 | fput(ts->wr); | |
291 | kfree(ts); | |
292 | } | |
293 | ||
a80d923e EVH |
294 | static struct p9_trans *p9_trans_create_tcp(const char *addr, char *args) |
295 | { | |
296 | int err; | |
297 | struct p9_trans *trans; | |
298 | struct socket *csocket; | |
299 | struct sockaddr_in sin_server; | |
300 | struct p9_fd_opts opts; | |
301 | ||
302 | parse_opts(args, &opts); | |
303 | ||
304 | csocket = NULL; | |
305 | trans = kmalloc(sizeof(struct p9_trans), GFP_KERNEL); | |
306 | if (!trans) | |
307 | return ERR_PTR(-ENOMEM); | |
308 | ||
309 | trans->write = p9_fd_write; | |
310 | trans->read = p9_fd_read; | |
311 | trans->close = p9_fd_close; | |
312 | trans->poll = p9_fd_poll; | |
313 | ||
314 | sin_server.sin_family = AF_INET; | |
315 | sin_server.sin_addr.s_addr = in_aton(addr); | |
316 | sin_server.sin_port = htons(opts.port); | |
317 | sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &csocket); | |
318 | ||
319 | if (!csocket) { | |
320 | P9_EPRINTK(KERN_ERR, "p9_trans_tcp: problem creating socket\n"); | |
321 | err = -EIO; | |
322 | goto error; | |
323 | } | |
324 | ||
325 | err = csocket->ops->connect(csocket, | |
326 | (struct sockaddr *)&sin_server, | |
327 | sizeof(struct sockaddr_in), 0); | |
328 | if (err < 0) { | |
329 | P9_EPRINTK(KERN_ERR, | |
330 | "p9_trans_tcp: problem connecting socket to %s\n", | |
331 | addr); | |
332 | goto error; | |
333 | } | |
334 | ||
335 | err = p9_socket_open(trans, csocket); | |
336 | if (err < 0) | |
337 | goto error; | |
338 | ||
339 | return trans; | |
340 | ||
341 | error: | |
342 | if (csocket) | |
343 | sock_release(csocket); | |
344 | ||
345 | kfree(trans); | |
346 | return ERR_PTR(err); | |
347 | } | |
348 | ||
349 | static struct p9_trans *p9_trans_create_unix(const char *addr, char *args) | |
350 | { | |
351 | int err; | |
352 | struct socket *csocket; | |
353 | struct sockaddr_un sun_server; | |
354 | struct p9_trans *trans; | |
355 | ||
356 | csocket = NULL; | |
357 | trans = kmalloc(sizeof(struct p9_trans), GFP_KERNEL); | |
358 | if (!trans) | |
359 | return ERR_PTR(-ENOMEM); | |
360 | ||
361 | trans->write = p9_fd_write; | |
362 | trans->read = p9_fd_read; | |
363 | trans->close = p9_fd_close; | |
364 | trans->poll = p9_fd_poll; | |
365 | ||
366 | if (strlen(addr) > UNIX_PATH_MAX) { | |
367 | P9_EPRINTK(KERN_ERR, "p9_trans_unix: address too long: %s\n", | |
368 | addr); | |
369 | err = -ENAMETOOLONG; | |
370 | goto error; | |
371 | } | |
372 | ||
373 | sun_server.sun_family = PF_UNIX; | |
374 | strcpy(sun_server.sun_path, addr); | |
375 | sock_create_kern(PF_UNIX, SOCK_STREAM, 0, &csocket); | |
376 | err = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server, | |
377 | sizeof(struct sockaddr_un) - 1, 0); | |
378 | if (err < 0) { | |
379 | P9_EPRINTK(KERN_ERR, | |
380 | "p9_trans_unix: problem connecting socket: %s: %d\n", | |
381 | addr, err); | |
382 | goto error; | |
383 | } | |
384 | ||
385 | err = p9_socket_open(trans, csocket); | |
386 | if (err < 0) | |
387 | goto error; | |
388 | ||
389 | return trans; | |
390 | ||
391 | error: | |
392 | if (csocket) | |
393 | sock_release(csocket); | |
394 | ||
395 | kfree(trans); | |
396 | return ERR_PTR(err); | |
397 | } | |
398 | ||
399 | static struct p9_trans *p9_trans_create_fd(const char *name, char *args) | |
400 | { | |
401 | int err; | |
402 | struct p9_trans *trans; | |
403 | struct p9_fd_opts opts; | |
404 | ||
405 | parse_opts(args, &opts); | |
406 | ||
407 | if (opts.rfd == ~0 || opts.wfd == ~0) { | |
408 | printk(KERN_ERR "v9fs: Insufficient options for proto=fd\n"); | |
409 | return ERR_PTR(-ENOPROTOOPT); | |
410 | } | |
411 | ||
412 | trans = kmalloc(sizeof(struct p9_trans), GFP_KERNEL); | |
413 | if (!trans) | |
414 | return ERR_PTR(-ENOMEM); | |
415 | ||
416 | trans->write = p9_fd_write; | |
417 | trans->read = p9_fd_read; | |
418 | trans->close = p9_fd_close; | |
419 | trans->poll = p9_fd_poll; | |
420 | ||
421 | err = p9_fd_open(trans, opts.rfd, opts.wfd); | |
422 | if (err < 0) | |
423 | goto error; | |
424 | ||
425 | return trans; | |
426 | ||
427 | error: | |
428 | kfree(trans); | |
429 | return ERR_PTR(err); | |
430 | } | |
431 | ||
432 | static struct p9_trans_module p9_tcp_trans = { | |
433 | .name = "tcp", | |
434 | .maxsize = MAX_SOCK_BUF, | |
435 | .def = 1, | |
436 | .create = p9_trans_create_tcp, | |
437 | }; | |
438 | ||
439 | static struct p9_trans_module p9_unix_trans = { | |
440 | .name = "unix", | |
441 | .maxsize = MAX_SOCK_BUF, | |
442 | .def = 0, | |
443 | .create = p9_trans_create_unix, | |
444 | }; | |
445 | ||
446 | static struct p9_trans_module p9_fd_trans = { | |
447 | .name = "fd", | |
448 | .maxsize = MAX_SOCK_BUF, | |
449 | .def = 0, | |
450 | .create = p9_trans_create_fd, | |
451 | }; | |
452 | ||
453 | static int __init p9_trans_fd_init(void) | |
454 | { | |
455 | v9fs_register_trans(&p9_tcp_trans); | |
456 | v9fs_register_trans(&p9_unix_trans); | |
457 | v9fs_register_trans(&p9_fd_trans); | |
458 | ||
459 | return 1; | |
460 | } | |
461 | ||
462 | static void __exit p9_trans_fd_exit(void) { | |
463 | printk(KERN_ERR "Removal of 9p transports not implemented\n"); | |
464 | BUG(); | |
465 | } | |
466 | ||
467 | module_init(p9_trans_fd_init); | |
468 | module_exit(p9_trans_fd_exit); | |
469 | ||
470 | MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>"); | |
471 | MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>"); | |
472 | MODULE_LICENSE("GPL"); |