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-rw-r--r--net/9p/Makefile1
-rw-r--r--net/9p/protocol.c457
-rw-r--r--net/9p/protocol.h31
3 files changed, 489 insertions, 0 deletions
diff --git a/net/9p/Makefile b/net/9p/Makefile
index 519219480db1..84c23499a293 100644
--- a/net/9p/Makefile
+++ b/net/9p/Makefile
@@ -8,6 +8,7 @@ obj-$(CONFIG_NET_9P_VIRTIO) += 9pnet_virtio.o
8 error.o \ 8 error.o \
9 fcprint.o \ 9 fcprint.o \
10 util.o \ 10 util.o \
11 protocol.o \
11 trans_fd.o \ 12 trans_fd.o \
12 13
139pnet_virtio-objs := \ 149pnet_virtio-objs := \
diff --git a/net/9p/protocol.c b/net/9p/protocol.c
new file mode 100644
index 000000000000..43e98220e9a4
--- /dev/null
+++ b/net/9p/protocol.c
@@ -0,0 +1,457 @@
1/*
2 * net/9p/protocol.c
3 *
4 * 9P Protocol Support Code
5 *
6 * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com>
7 *
8 * Base on code from Anthony Liguori <aliguori@us.ibm.com>
9 * Copyright (C) 2008 by IBM, Corp.
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/module.h>
29#include <linux/errno.h>
30#include <net/9p/9p.h>
31#include <net/9p/client.h>
32#include "protocol.h"
33
34#ifndef MIN
35#define MIN(a, b) (((a) < (b)) ? (a) : (b))
36#endif
37
38#ifndef MAX
39#define MAX(a, b) (((a) > (b)) ? (a) : (b))
40#endif
41
42#ifndef offset_of
43#define offset_of(type, memb) \
44 ((unsigned long)(&((type *)0)->memb))
45#endif
46#ifndef container_of
47#define container_of(obj, type, memb) \
48 ((type *)(((char *)obj) - offset_of(type, memb)))
49#endif
50
51static int
52p9pdu_writef(struct p9_fcall *pdu, int optional, const char *fmt, ...);
53
54void p9stat_free(struct p9_wstat *stbuf)
55{
56 kfree(stbuf->name);
57 kfree(stbuf->uid);
58 kfree(stbuf->gid);
59 kfree(stbuf->muid);
60 kfree(stbuf->extension);
61}
62EXPORT_SYMBOL(p9stat_free);
63
64static size_t pdu_read(struct p9_fcall *pdu, void *data, size_t size)
65{
66 size_t len = MIN(pdu->size - pdu->offset, size);
67 memcpy(data, &pdu->sdata[pdu->offset], len);
68 pdu->offset += len;
69 return size - len;
70}
71
72static size_t pdu_write(struct p9_fcall *pdu, const void *data, size_t size)
73{
74 size_t len = MIN(pdu->capacity - pdu->size, size);
75 memcpy(&pdu->sdata[pdu->size], data, len);
76 pdu->size += len;
77 return size - len;
78}
79
80/*
81 b - int8_t
82 w - int16_t
83 d - int32_t
84 q - int64_t
85 s - string
86 S - stat
87 Q - qid
88 D - data blob (int32_t size followed by void *, results are not freed)
89 T - array of strings (int16_t count, followed by strings)
90 R - array of qids (int16_t count, followed by qids)
91 ? - if optional = 1, continue parsing
92*/
93
94static int
95p9pdu_vreadf(struct p9_fcall *pdu, int optional, const char *fmt, va_list ap)
96{
97 const char *ptr;
98 int errcode = 0;
99
100 for (ptr = fmt; *ptr; ptr++) {
101 switch (*ptr) {
102 case 'b':{
103 int8_t *val = va_arg(ap, int8_t *);
104 if (pdu_read(pdu, val, sizeof(*val))) {
105 errcode = -EFAULT;
106 break;
107 }
108 }
109 break;
110 case 'w':{
111 int16_t *val = va_arg(ap, int16_t *);
112 if (pdu_read(pdu, val, sizeof(*val))) {
113 errcode = -EFAULT;
114 break;
115 }
116 *val = cpu_to_le16(*val);
117 }
118 break;
119 case 'd':{
120 int32_t *val = va_arg(ap, int32_t *);
121 if (pdu_read(pdu, val, sizeof(*val))) {
122 errcode = -EFAULT;
123 break;
124 }
125 *val = cpu_to_le32(*val);
126 }
127 break;
128 case 'q':{
129 int64_t *val = va_arg(ap, int64_t *);
130 if (pdu_read(pdu, val, sizeof(*val))) {
131 errcode = -EFAULT;
132 break;
133 }
134 *val = cpu_to_le64(*val);
135 }
136 break;
137 case 's':{
138 char **ptr = va_arg(ap, char **);
139 int16_t len;
140 int size;
141
142 errcode = p9pdu_readf(pdu, optional, "w", &len);
143 if (errcode)
144 break;
145
146 size = MAX(len, 0);
147
148 *ptr = kmalloc(size + 1, GFP_KERNEL);
149 if (*ptr == NULL) {
150 errcode = -EFAULT;
151 break;
152 }
153 if (pdu_read(pdu, *ptr, size)) {
154 errcode = -EFAULT;
155 kfree(*ptr);
156 *ptr = NULL;
157 } else
158 (*ptr)[size] = 0;
159 }
160 break;
161 case 'Q':{
162 struct p9_qid *qid =
163 va_arg(ap, struct p9_qid *);
164
165 errcode = p9pdu_readf(pdu, optional, "bdq",
166 &qid->type, &qid->version,
167 &qid->path);
168 }
169 break;
170 case 'S':{
171 struct p9_wstat *stbuf =
172 va_arg(ap, struct p9_wstat *);
173
174 stbuf->extension = NULL;
175 stbuf->n_uid = stbuf->n_gid = stbuf->n_muid =
176 -1;
177
178 errcode =
179 p9pdu_readf(pdu, optional,
180 "wwdQdddqssss?sddd",
181 &stbuf->size, &stbuf->type,
182 &stbuf->dev, &stbuf->qid,
183 &stbuf->mode, &stbuf->atime,
184 &stbuf->mtime, &stbuf->length,
185 &stbuf->name, &stbuf->uid,
186 &stbuf->gid, &stbuf->muid,
187 &stbuf->extension,
188 &stbuf->n_uid, &stbuf->n_gid,
189 &stbuf->n_muid);
190 if (errcode)
191 p9stat_free(stbuf);
192 }
193 break;
194 case 'D':{
195 int32_t *count = va_arg(ap, int32_t *);
196 void **data = va_arg(ap, void **);
197
198 errcode =
199 p9pdu_readf(pdu, optional, "d", count);
200 if (!errcode) {
201 *count =
202 MIN(*count,
203 pdu->size - pdu->offset);
204 *data = &pdu->sdata[pdu->offset];
205 }
206 }
207 break;
208 case 'T':{
209 int16_t *nwname = va_arg(ap, int16_t *);
210 char ***wnames = va_arg(ap, char ***);
211
212 errcode =
213 p9pdu_readf(pdu, optional, "w", nwname);
214 if (!errcode) {
215 *wnames =
216 kmalloc(sizeof(char *) * *nwname,
217 GFP_KERNEL);
218 if (!*wnames)
219 errcode = -ENOMEM;
220 }
221
222 if (!errcode) {
223 int i;
224
225 for (i = 0; i < *nwname; i++) {
226 errcode =
227 p9pdu_readf(pdu, optional,
228 "s",
229 &(*wnames)[i]);
230 if (errcode)
231 break;
232 }
233 }
234
235 if (errcode) {
236 if (*wnames) {
237 int i;
238
239 for (i = 0; i < *nwname; i++)
240 kfree((*wnames)[i]);
241 }
242 kfree(*wnames);
243 *wnames = NULL;
244 }
245 }
246 break;
247 case 'R':{
248 int16_t *nwqid = va_arg(ap, int16_t *);
249 struct p9_qid **wqids =
250 va_arg(ap, struct p9_qid **);
251
252 *wqids = NULL;
253
254 errcode =
255 p9pdu_readf(pdu, optional, "w", nwqid);
256 if (!errcode) {
257 *wqids =
258 kmalloc(*nwqid *
259 sizeof(struct p9_qid),
260 GFP_KERNEL);
261 if (*wqids == NULL)
262 errcode = -ENOMEM;
263 }
264
265 if (!errcode) {
266 int i;
267
268 for (i = 0; i < *nwqid; i++) {
269 errcode =
270 p9pdu_readf(pdu, optional,
271 "Q",
272 &(*wqids)[i]);
273 if (errcode)
274 break;
275 }
276 }
277
278 if (errcode) {
279 kfree(*wqids);
280 *wqids = NULL;
281 }
282 }
283 break;
284 case '?':
285 if (!optional)
286 return 0;
287 break;
288 default:
289 BUG();
290 break;
291 }
292
293 if (errcode)
294 break;
295 }
296
297 return errcode;
298}
299
300int
301p9pdu_vwritef(struct p9_fcall *pdu, int optional, const char *fmt, va_list ap)
302{
303 const char *ptr;
304 int errcode = 0;
305
306 for (ptr = fmt; *ptr; ptr++) {
307 switch (*ptr) {
308 case 'b':{
309 int8_t val = va_arg(ap, int);
310 if (pdu_write(pdu, &val, sizeof(val)))
311 errcode = -EFAULT;
312 }
313 break;
314 case 'w':{
315 int16_t val = va_arg(ap, int);
316 if (pdu_write(pdu, &val, sizeof(val)))
317 errcode = -EFAULT;
318 }
319 break;
320 case 'd':{
321 int32_t val = va_arg(ap, int32_t);
322 if (pdu_write(pdu, &val, sizeof(val)))
323 errcode = -EFAULT;
324 }
325 break;
326 case 'q':{
327 int64_t val = va_arg(ap, int64_t);
328 if (pdu_write(pdu, &val, sizeof(val)))
329 errcode = -EFAULT;
330 }
331 break;
332 case 's':{
333 const char *ptr = va_arg(ap, const char *);
334 int16_t len = 0;
335
336 if (ptr)
337 len = MIN(strlen(ptr), USHORT_MAX);
338
339 errcode = p9pdu_writef(pdu, optional, "w", len);
340 if (!errcode && pdu_write(pdu, ptr, len))
341 errcode = -EFAULT;
342 }
343 break;
344 case 'Q':{
345 const struct p9_qid *qid =
346 va_arg(ap, const struct p9_qid *);
347 errcode =
348 p9pdu_writef(pdu, optional, "bdq",
349 qid->type, qid->version,
350 qid->path);
351 } break;
352 case 'S':{
353 const struct p9_wstat *stbuf =
354 va_arg(ap, const struct p9_wstat *);
355 errcode =
356 p9pdu_writef(pdu, optional,
357 "wwdQdddqssss?sddd",
358 stbuf->size, stbuf->type,
359 stbuf->dev, stbuf->qid,
360 stbuf->mode, stbuf->atime,
361 stbuf->mtime, stbuf->length,
362 stbuf->name, stbuf->uid,
363 stbuf->gid, stbuf->muid,
364 stbuf->extension, stbuf->n_uid,
365 stbuf->n_gid, stbuf->n_muid);
366 } break;
367 case 'D':{
368 int32_t count = va_arg(ap, int32_t);
369 const void *data = va_arg(ap, const void *);
370
371 errcode =
372 p9pdu_writef(pdu, optional, "d", count);
373 if (!errcode && pdu_write(pdu, data, count))
374 errcode = -EFAULT;
375 }
376 break;
377 case 'T':{
378 int16_t nwname = va_arg(ap, int);
379 const char **wnames = va_arg(ap, const char **);
380
381 errcode =
382 p9pdu_writef(pdu, optional, "w", nwname);
383 if (!errcode) {
384 int i;
385
386 for (i = 0; i < nwname; i++) {
387 errcode =
388 p9pdu_writef(pdu, optional,
389 "s",
390 wnames[i]);
391 if (errcode)
392 break;
393 }
394 }
395 }
396 break;
397 case 'R':{
398 int16_t nwqid = va_arg(ap, int);
399 struct p9_qid *wqids =
400 va_arg(ap, struct p9_qid *);
401
402 errcode =
403 p9pdu_writef(pdu, optional, "w", nwqid);
404 if (!errcode) {
405 int i;
406
407 for (i = 0; i < nwqid; i++) {
408 errcode =
409 p9pdu_writef(pdu, optional,
410 "Q",
411 &wqids[i]);
412 if (errcode)
413 break;
414 }
415 }
416 }
417 break;
418 case '?':
419 if (!optional)
420 return 0;
421 break;
422 default:
423 BUG();
424 break;
425 }
426
427 if (errcode)
428 break;
429 }
430
431 return errcode;
432}
433
434int p9pdu_readf(struct p9_fcall *pdu, int optional, const char *fmt, ...)
435{
436 va_list ap;
437 int ret;
438
439 va_start(ap, fmt);
440 ret = p9pdu_vreadf(pdu, optional, fmt, ap);
441 va_end(ap);
442
443 return ret;
444}
445
446static int
447p9pdu_writef(struct p9_fcall *pdu, int optional, const char *fmt, ...)
448{
449 va_list ap;
450 int ret;
451
452 va_start(ap, fmt);
453 ret = p9pdu_vwritef(pdu, optional, fmt, ap);
454 va_end(ap);
455
456 return ret;
457}
diff --git a/net/9p/protocol.h b/net/9p/protocol.h
new file mode 100644
index 000000000000..596ee10d506f
--- /dev/null
+++ b/net/9p/protocol.h
@@ -0,0 +1,31 @@
1/*
2 * net/9p/protocol.h
3 *
4 * 9P Protocol Support Code
5 *
6 * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com>
7 *
8 * Base on code from Anthony Liguori <aliguori@us.ibm.com>
9 * Copyright (C) 2008 by IBM, Corp.
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
28int
29p9pdu_vwritef(struct p9_fcall *pdu, int optional, const char *fmt, va_list ap);
30
31int p9pdu_readf(struct p9_fcall *pdu, int optional, const char *fmt, ...);
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-16 10:19:05 -0500