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 */ | |
55762690 | 65 | Opt_port, Opt_rfdno, Opt_wfdno, Opt_err, |
a80d923e | 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"}, | |
55762690 | 72 | {Opt_err, NULL}, |
a80d923e | 73 | }; |
bd238fb4 | 74 | |
a80d923e EVH |
75 | /** |
76 | * v9fs_parse_options - parse mount options into session structure | |
77 | * @options: options string passed from mount | |
78 | * @v9ses: existing v9fs session information | |
79 | * | |
80 | */ | |
bd238fb4 | 81 | |
a80d923e | 82 | static void parse_opts(char *options, struct p9_fd_opts *opts) |
bd238fb4 | 83 | { |
a80d923e EVH |
84 | char *p; |
85 | substring_t args[MAX_OPT_ARGS]; | |
86 | int option; | |
87 | int ret; | |
bd238fb4 | 88 | |
a80d923e EVH |
89 | opts->port = P9_PORT; |
90 | opts->rfd = ~0; | |
91 | opts->wfd = ~0; | |
bd238fb4 | 92 | |
a80d923e EVH |
93 | if (!options) |
94 | return; | |
bd238fb4 | 95 | |
a80d923e EVH |
96 | while ((p = strsep(&options, ",")) != NULL) { |
97 | int token; | |
98 | if (!*p) | |
99 | continue; | |
100 | token = match_token(p, tokens, args); | |
101 | ret = match_int(&args[0], &option); | |
102 | if (ret < 0) { | |
103 | P9_DPRINTK(P9_DEBUG_ERROR, | |
104 | "integer field, but no integer?\n"); | |
105 | continue; | |
106 | } | |
107 | switch (token) { | |
108 | case Opt_port: | |
109 | opts->port = option; | |
110 | break; | |
111 | case Opt_rfdno: | |
112 | opts->rfd = option; | |
113 | break; | |
114 | case Opt_wfdno: | |
115 | opts->wfd = option; | |
116 | break; | |
117 | default: | |
118 | continue; | |
119 | } | |
bd238fb4 | 120 | } |
bd238fb4 | 121 | } |
bd238fb4 | 122 | |
a80d923e | 123 | static int p9_fd_open(struct p9_trans *trans, int rfd, int wfd) |
bd238fb4 | 124 | { |
a80d923e EVH |
125 | struct p9_trans_fd *ts = kmalloc(sizeof(struct p9_trans_fd), |
126 | GFP_KERNEL); | |
127 | if (!ts) | |
128 | return -ENOMEM; | |
bd238fb4 | 129 | |
a80d923e EVH |
130 | ts->rd = fget(rfd); |
131 | ts->wr = fget(wfd); | |
132 | if (!ts->rd || !ts->wr) { | |
133 | if (ts->rd) | |
134 | fput(ts->rd); | |
135 | if (ts->wr) | |
136 | fput(ts->wr); | |
137 | kfree(ts); | |
138 | return -EIO; | |
bd238fb4 LI |
139 | } |
140 | ||
a80d923e EVH |
141 | trans->priv = ts; |
142 | trans->status = Connected; | |
bd238fb4 | 143 | |
a80d923e | 144 | return 0; |
bd238fb4 | 145 | } |
bd238fb4 | 146 | |
a80d923e | 147 | static int p9_socket_open(struct p9_trans *trans, struct socket *csocket) |
bd238fb4 LI |
148 | { |
149 | int fd, ret; | |
150 | ||
151 | csocket->sk->sk_allocation = GFP_NOIO; | |
152 | fd = sock_map_fd(csocket); | |
153 | if (fd < 0) { | |
154 | P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to map fd\n"); | |
155 | return fd; | |
156 | } | |
157 | ||
158 | ret = p9_fd_open(trans, fd, fd); | |
159 | if (ret < 0) { | |
160 | P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to open fd\n"); | |
161 | sockfd_put(csocket); | |
162 | return ret; | |
163 | } | |
164 | ||
165 | ((struct p9_trans_fd *)trans->priv)->rd->f_flags |= O_NONBLOCK; | |
166 | ||
167 | return 0; | |
168 | } | |
169 | ||
bd238fb4 LI |
170 | /** |
171 | * p9_fd_read- read from a fd | |
172 | * @v9ses: session information | |
173 | * @v: buffer to receive data into | |
174 | * @len: size of receive buffer | |
175 | * | |
176 | */ | |
a80d923e | 177 | static int p9_fd_read(struct p9_trans *trans, void *v, int len) |
bd238fb4 LI |
178 | { |
179 | int ret; | |
180 | struct p9_trans_fd *ts = NULL; | |
181 | ||
182 | if (trans && trans->status != Disconnected) | |
183 | ts = trans->priv; | |
184 | ||
185 | if (!ts) | |
186 | return -EREMOTEIO; | |
187 | ||
188 | if (!(ts->rd->f_flags & O_NONBLOCK)) | |
189 | P9_DPRINTK(P9_DEBUG_ERROR, "blocking read ...\n"); | |
190 | ||
191 | ret = kernel_read(ts->rd, ts->rd->f_pos, v, len); | |
192 | if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) | |
193 | trans->status = Disconnected; | |
194 | return ret; | |
195 | } | |
196 | ||
197 | /** | |
198 | * p9_fd_write - write to a socket | |
199 | * @v9ses: session information | |
200 | * @v: buffer to send data from | |
201 | * @len: size of send buffer | |
202 | * | |
203 | */ | |
a80d923e | 204 | static int p9_fd_write(struct p9_trans *trans, void *v, int len) |
bd238fb4 LI |
205 | { |
206 | int ret; | |
207 | mm_segment_t oldfs; | |
208 | struct p9_trans_fd *ts = NULL; | |
209 | ||
210 | if (trans && trans->status != Disconnected) | |
211 | ts = trans->priv; | |
212 | ||
213 | if (!ts) | |
214 | return -EREMOTEIO; | |
215 | ||
216 | if (!(ts->wr->f_flags & O_NONBLOCK)) | |
217 | P9_DPRINTK(P9_DEBUG_ERROR, "blocking write ...\n"); | |
218 | ||
219 | oldfs = get_fs(); | |
220 | set_fs(get_ds()); | |
221 | /* The cast to a user pointer is valid due to the set_fs() */ | |
222 | ret = vfs_write(ts->wr, (void __user *)v, len, &ts->wr->f_pos); | |
223 | set_fs(oldfs); | |
224 | ||
225 | if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) | |
226 | trans->status = Disconnected; | |
227 | return ret; | |
228 | } | |
229 | ||
230 | static unsigned int | |
a80d923e | 231 | p9_fd_poll(struct p9_trans *trans, struct poll_table_struct *pt) |
bd238fb4 LI |
232 | { |
233 | int ret, n; | |
234 | struct p9_trans_fd *ts = NULL; | |
235 | mm_segment_t oldfs; | |
236 | ||
237 | if (trans && trans->status == Connected) | |
238 | ts = trans->priv; | |
239 | ||
240 | if (!ts) | |
241 | return -EREMOTEIO; | |
242 | ||
243 | if (!ts->rd->f_op || !ts->rd->f_op->poll) | |
244 | return -EIO; | |
245 | ||
246 | if (!ts->wr->f_op || !ts->wr->f_op->poll) | |
247 | return -EIO; | |
248 | ||
249 | oldfs = get_fs(); | |
250 | set_fs(get_ds()); | |
251 | ||
252 | ret = ts->rd->f_op->poll(ts->rd, pt); | |
253 | if (ret < 0) | |
254 | goto end; | |
255 | ||
256 | if (ts->rd != ts->wr) { | |
257 | n = ts->wr->f_op->poll(ts->wr, pt); | |
258 | if (n < 0) { | |
259 | ret = n; | |
260 | goto end; | |
261 | } | |
262 | ret = (ret & ~POLLOUT) | (n & ~POLLIN); | |
263 | } | |
264 | ||
265 | end: | |
266 | set_fs(oldfs); | |
267 | return ret; | |
268 | } | |
269 | ||
270 | /** | |
271 | * p9_sock_close - shutdown socket | |
272 | * @trans: private socket structure | |
273 | * | |
274 | */ | |
a80d923e | 275 | static void p9_fd_close(struct p9_trans *trans) |
bd238fb4 LI |
276 | { |
277 | struct p9_trans_fd *ts; | |
278 | ||
279 | if (!trans) | |
280 | return; | |
281 | ||
282 | ts = xchg(&trans->priv, NULL); | |
283 | ||
284 | if (!ts) | |
285 | return; | |
286 | ||
287 | trans->status = Disconnected; | |
288 | if (ts->rd) | |
289 | fput(ts->rd); | |
290 | if (ts->wr) | |
291 | fput(ts->wr); | |
292 | kfree(ts); | |
293 | } | |
294 | ||
a80d923e EVH |
295 | static struct p9_trans *p9_trans_create_tcp(const char *addr, char *args) |
296 | { | |
297 | int err; | |
298 | struct p9_trans *trans; | |
299 | struct socket *csocket; | |
300 | struct sockaddr_in sin_server; | |
301 | struct p9_fd_opts opts; | |
302 | ||
303 | parse_opts(args, &opts); | |
304 | ||
305 | csocket = NULL; | |
306 | trans = kmalloc(sizeof(struct p9_trans), GFP_KERNEL); | |
307 | if (!trans) | |
308 | return ERR_PTR(-ENOMEM); | |
309 | ||
310 | trans->write = p9_fd_write; | |
311 | trans->read = p9_fd_read; | |
312 | trans->close = p9_fd_close; | |
313 | trans->poll = p9_fd_poll; | |
314 | ||
315 | sin_server.sin_family = AF_INET; | |
316 | sin_server.sin_addr.s_addr = in_aton(addr); | |
317 | sin_server.sin_port = htons(opts.port); | |
318 | sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &csocket); | |
319 | ||
320 | if (!csocket) { | |
321 | P9_EPRINTK(KERN_ERR, "p9_trans_tcp: problem creating socket\n"); | |
322 | err = -EIO; | |
323 | goto error; | |
324 | } | |
325 | ||
326 | err = csocket->ops->connect(csocket, | |
327 | (struct sockaddr *)&sin_server, | |
328 | sizeof(struct sockaddr_in), 0); | |
329 | if (err < 0) { | |
330 | P9_EPRINTK(KERN_ERR, | |
331 | "p9_trans_tcp: problem connecting socket to %s\n", | |
332 | addr); | |
333 | goto error; | |
334 | } | |
335 | ||
336 | err = p9_socket_open(trans, csocket); | |
337 | if (err < 0) | |
338 | goto error; | |
339 | ||
340 | return trans; | |
341 | ||
342 | error: | |
343 | if (csocket) | |
344 | sock_release(csocket); | |
345 | ||
346 | kfree(trans); | |
347 | return ERR_PTR(err); | |
348 | } | |
349 | ||
350 | static struct p9_trans *p9_trans_create_unix(const char *addr, char *args) | |
351 | { | |
352 | int err; | |
353 | struct socket *csocket; | |
354 | struct sockaddr_un sun_server; | |
355 | struct p9_trans *trans; | |
356 | ||
357 | csocket = NULL; | |
358 | trans = kmalloc(sizeof(struct p9_trans), GFP_KERNEL); | |
359 | if (!trans) | |
360 | return ERR_PTR(-ENOMEM); | |
361 | ||
362 | trans->write = p9_fd_write; | |
363 | trans->read = p9_fd_read; | |
364 | trans->close = p9_fd_close; | |
365 | trans->poll = p9_fd_poll; | |
366 | ||
367 | if (strlen(addr) > UNIX_PATH_MAX) { | |
368 | P9_EPRINTK(KERN_ERR, "p9_trans_unix: address too long: %s\n", | |
369 | addr); | |
370 | err = -ENAMETOOLONG; | |
371 | goto error; | |
372 | } | |
373 | ||
374 | sun_server.sun_family = PF_UNIX; | |
375 | strcpy(sun_server.sun_path, addr); | |
376 | sock_create_kern(PF_UNIX, SOCK_STREAM, 0, &csocket); | |
377 | err = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server, | |
378 | sizeof(struct sockaddr_un) - 1, 0); | |
379 | if (err < 0) { | |
380 | P9_EPRINTK(KERN_ERR, | |
381 | "p9_trans_unix: problem connecting socket: %s: %d\n", | |
382 | addr, err); | |
383 | goto error; | |
384 | } | |
385 | ||
386 | err = p9_socket_open(trans, csocket); | |
387 | if (err < 0) | |
388 | goto error; | |
389 | ||
390 | return trans; | |
391 | ||
392 | error: | |
393 | if (csocket) | |
394 | sock_release(csocket); | |
395 | ||
396 | kfree(trans); | |
397 | return ERR_PTR(err); | |
398 | } | |
399 | ||
400 | static struct p9_trans *p9_trans_create_fd(const char *name, char *args) | |
401 | { | |
402 | int err; | |
403 | struct p9_trans *trans; | |
404 | struct p9_fd_opts opts; | |
405 | ||
406 | parse_opts(args, &opts); | |
407 | ||
408 | if (opts.rfd == ~0 || opts.wfd == ~0) { | |
409 | printk(KERN_ERR "v9fs: Insufficient options for proto=fd\n"); | |
410 | return ERR_PTR(-ENOPROTOOPT); | |
411 | } | |
412 | ||
413 | trans = kmalloc(sizeof(struct p9_trans), GFP_KERNEL); | |
414 | if (!trans) | |
415 | return ERR_PTR(-ENOMEM); | |
416 | ||
417 | trans->write = p9_fd_write; | |
418 | trans->read = p9_fd_read; | |
419 | trans->close = p9_fd_close; | |
420 | trans->poll = p9_fd_poll; | |
421 | ||
422 | err = p9_fd_open(trans, opts.rfd, opts.wfd); | |
423 | if (err < 0) | |
424 | goto error; | |
425 | ||
426 | return trans; | |
427 | ||
428 | error: | |
429 | kfree(trans); | |
430 | return ERR_PTR(err); | |
431 | } | |
432 | ||
433 | static struct p9_trans_module p9_tcp_trans = { | |
434 | .name = "tcp", | |
435 | .maxsize = MAX_SOCK_BUF, | |
436 | .def = 1, | |
437 | .create = p9_trans_create_tcp, | |
438 | }; | |
439 | ||
440 | static struct p9_trans_module p9_unix_trans = { | |
441 | .name = "unix", | |
442 | .maxsize = MAX_SOCK_BUF, | |
443 | .def = 0, | |
444 | .create = p9_trans_create_unix, | |
445 | }; | |
446 | ||
447 | static struct p9_trans_module p9_fd_trans = { | |
448 | .name = "fd", | |
449 | .maxsize = MAX_SOCK_BUF, | |
450 | .def = 0, | |
451 | .create = p9_trans_create_fd, | |
452 | }; | |
453 | ||
454 | static int __init p9_trans_fd_init(void) | |
455 | { | |
456 | v9fs_register_trans(&p9_tcp_trans); | |
457 | v9fs_register_trans(&p9_unix_trans); | |
458 | v9fs_register_trans(&p9_fd_trans); | |
459 | ||
460 | return 1; | |
461 | } | |
462 | ||
463 | static void __exit p9_trans_fd_exit(void) { | |
464 | printk(KERN_ERR "Removal of 9p transports not implemented\n"); | |
465 | BUG(); | |
466 | } | |
467 | ||
468 | module_init(p9_trans_fd_init); | |
469 | module_exit(p9_trans_fd_exit); | |
470 | ||
471 | MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>"); | |
472 | MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>"); | |
473 | MODULE_LICENSE("GPL"); |