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ipv4: Fix ip_queue_xmit to pass sk into ip_local_out_sk
[linux-2.6/btrfs-unstable.git] / net / 9p / trans_fd.c
blobbced8c074c1280c6ff175576cb035bf048f18ddd
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>
8 * Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com>
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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
29
30 #include <linux/in.h>
31 #include <linux/module.h>
32 #include <linux/net.h>
33 #include <linux/ipv6.h>
34 #include <linux/kthread.h>
35 #include <linux/errno.h>
36 #include <linux/kernel.h>
37 #include <linux/un.h>
38 #include <linux/uaccess.h>
39 #include <linux/inet.h>
40 #include <linux/idr.h>
41 #include <linux/file.h>
42 #include <linux/parser.h>
43 #include <linux/slab.h>
44 #include <net/9p/9p.h>
45 #include <net/9p/client.h>
46 #include <net/9p/transport.h>
47
48 #include <linux/syscalls.h> /* killme */
49
50 #define P9_PORT 564
51 #define MAX_SOCK_BUF (64*1024)
52 #define MAXPOLLWADDR 2
53
54 /**
55 * struct p9_fd_opts - per-transport options
56 * @rfd: file descriptor for reading (trans=fd)
57 * @wfd: file descriptor for writing (trans=fd)
58 * @port: port to connect to (trans=tcp)
59 *
60 */
61
62 struct p9_fd_opts {
63 int rfd;
64 int wfd;
65 u16 port;
66 int privport;
67 };
68
69 /*
70 * Option Parsing (code inspired by NFS code)
71 * - a little lazy - parse all fd-transport options
72 */
73
74 enum {
75 /* Options that take integer arguments */
76 Opt_port, Opt_rfdno, Opt_wfdno, Opt_err,
77 /* Options that take no arguments */
78 Opt_privport,
79 };
80
81 static const match_table_t tokens = {
82 {Opt_port, "port=%u"},
83 {Opt_rfdno, "rfdno=%u"},
84 {Opt_wfdno, "wfdno=%u"},
85 {Opt_privport, "privport"},
86 {Opt_err, NULL},
87 };
88
89 enum {
90 Rworksched = 1, /* read work scheduled or running */
91 Rpending = 2, /* can read */
92 Wworksched = 4, /* write work scheduled or running */
93 Wpending = 8, /* can write */
94 };
95
96 struct p9_poll_wait {
97 struct p9_conn *conn;
98 wait_queue_t wait;
99 wait_queue_head_t *wait_addr;
100 };
101
102 /**
103 * struct p9_conn - fd mux connection state information
104 * @mux_list: list link for mux to manage multiple connections (?)
105 * @client: reference to client instance for this connection
106 * @err: error state
107 * @req_list: accounting for requests which have been sent
108 * @unsent_req_list: accounting for requests that haven't been sent
109 * @req: current request being processed (if any)
110 * @tmp_buf: temporary buffer to read in header
111 * @rsize: amount to read for current frame
112 * @rpos: read position in current frame
113 * @rbuf: current read buffer
114 * @wpos: write position for current frame
115 * @wsize: amount of data to write for current frame
116 * @wbuf: current write buffer
117 * @poll_pending_link: pending links to be polled per conn
118 * @poll_wait: array of wait_q's for various worker threads
119 * @pt: poll state
120 * @rq: current read work
121 * @wq: current write work
122 * @wsched: ????
123 *
124 */
125
126 struct p9_conn {
127 struct list_head mux_list;
128 struct p9_client *client;
129 int err;
130 struct list_head req_list;
131 struct list_head unsent_req_list;
132 struct p9_req_t *req;
133 char tmp_buf[7];
134 int rsize;
135 int rpos;
136 char *rbuf;
137 int wpos;
138 int wsize;
139 char *wbuf;
140 struct list_head poll_pending_link;
141 struct p9_poll_wait poll_wait[MAXPOLLWADDR];
142 poll_table pt;
143 struct work_struct rq;
144 struct work_struct wq;
145 unsigned long wsched;
146 };
147
148 /**
149 * struct p9_trans_fd - transport state
150 * @rd: reference to file to read from
151 * @wr: reference of file to write to
152 * @conn: connection state reference
153 *
154 */
155
156 struct p9_trans_fd {
157 struct file *rd;
158 struct file *wr;
159 struct p9_conn conn;
160 };
161
162 static void p9_poll_workfn(struct work_struct *work);
163
164 static DEFINE_SPINLOCK(p9_poll_lock);
165 static LIST_HEAD(p9_poll_pending_list);
166 static DECLARE_WORK(p9_poll_work, p9_poll_workfn);
167
168 static unsigned int p9_ipport_resv_min = P9_DEF_MIN_RESVPORT;
169 static unsigned int p9_ipport_resv_max = P9_DEF_MAX_RESVPORT;
170
171 static void p9_mux_poll_stop(struct p9_conn *m)
172 {
173 unsigned long flags;
174 int i;
175
176 for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {
177 struct p9_poll_wait *pwait = &m->poll_wait[i];
178
179 if (pwait->wait_addr) {
180 remove_wait_queue(pwait->wait_addr, &pwait->wait);
181 pwait->wait_addr = NULL;
182 }
183 }
184
185 spin_lock_irqsave(&p9_poll_lock, flags);
186 list_del_init(&m->poll_pending_link);
187 spin_unlock_irqrestore(&p9_poll_lock, flags);
188 }
189
190 /**
191 * p9_conn_cancel - cancel all pending requests with error
192 * @m: mux data
193 * @err: error code
194 *
195 */
196
197 static void p9_conn_cancel(struct p9_conn *m, int err)
198 {
199 struct p9_req_t *req, *rtmp;
200 unsigned long flags;
201 LIST_HEAD(cancel_list);
202
203 p9_debug(P9_DEBUG_ERROR, "mux %p err %d\n", m, err);
204
205 spin_lock_irqsave(&m->client->lock, flags);
206
207 if (m->err) {
208 spin_unlock_irqrestore(&m->client->lock, flags);
209 return;
210 }
211
212 m->err = err;
213
214 list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) {
215 list_move(&req->req_list, &cancel_list);
216 }
217 list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) {
218 list_move(&req->req_list, &cancel_list);
219 }
220 spin_unlock_irqrestore(&m->client->lock, flags);
221
222 list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) {
223 p9_debug(P9_DEBUG_ERROR, "call back req %p\n", req);
224 list_del(&req->req_list);
225 if (!req->t_err)
226 req->t_err = err;
227 p9_client_cb(m->client, req, REQ_STATUS_ERROR);
228 }
229 }
230
231 static int
232 p9_fd_poll(struct p9_client *client, struct poll_table_struct *pt)
233 {
234 int ret, n;
235 struct p9_trans_fd *ts = NULL;
236
237 if (client && client->status == Connected)
238 ts = client->trans;
239
240 if (!ts)
241 return -EREMOTEIO;
242
243 if (!ts->rd->f_op->poll)
244 return -EIO;
245
246 if (!ts->wr->f_op->poll)
247 return -EIO;
248
249 ret = ts->rd->f_op->poll(ts->rd, pt);
250 if (ret < 0)
251 return ret;
252
253 if (ts->rd != ts->wr) {
254 n = ts->wr->f_op->poll(ts->wr, pt);
255 if (n < 0)
256 return n;
257 ret = (ret & ~POLLOUT) | (n & ~POLLIN);
258 }
259
260 return ret;
261 }
262
263 /**
264 * p9_fd_read- read from a fd
265 * @client: client instance
266 * @v: buffer to receive data into
267 * @len: size of receive buffer
268 *
269 */
270
271 static int p9_fd_read(struct p9_client *client, void *v, int len)
272 {
273 int ret;
274 struct p9_trans_fd *ts = NULL;
275
276 if (client && client->status != Disconnected)
277 ts = client->trans;
278
279 if (!ts)
280 return -EREMOTEIO;
281
282 if (!(ts->rd->f_flags & O_NONBLOCK))
283 p9_debug(P9_DEBUG_ERROR, "blocking read ...\n");
284
285 ret = kernel_read(ts->rd, ts->rd->f_pos, v, len);
286 if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
287 client->status = Disconnected;
288 return ret;
289 }
290
291 /**
292 * p9_read_work - called when there is some data to be read from a transport
293 * @work: container of work to be done
294 *
295 */
296
297 static void p9_read_work(struct work_struct *work)
298 {
299 int n, err;
300 struct p9_conn *m;
301 int status = REQ_STATUS_ERROR;
302
303 m = container_of(work, struct p9_conn, rq);
304
305 if (m->err < 0)
306 return;
307
308 p9_debug(P9_DEBUG_TRANS, "start mux %p pos %d\n", m, m->rpos);
309
310 if (!m->rbuf) {
311 m->rbuf = m->tmp_buf;
312 m->rpos = 0;
313 m->rsize = 7; /* start by reading header */
314 }
315
316 clear_bit(Rpending, &m->wsched);
317 p9_debug(P9_DEBUG_TRANS, "read mux %p pos %d size: %d = %d\n",
318 m, m->rpos, m->rsize, m->rsize-m->rpos);
319 err = p9_fd_read(m->client, m->rbuf + m->rpos,
320 m->rsize - m->rpos);
321 p9_debug(P9_DEBUG_TRANS, "mux %p got %d bytes\n", m, err);
322 if (err == -EAGAIN) {
323 goto end_clear;
324 }
325
326 if (err <= 0)
327 goto error;
328
329 m->rpos += err;
330
331 if ((!m->req) && (m->rpos == m->rsize)) { /* header read in */
332 u16 tag;
333 p9_debug(P9_DEBUG_TRANS, "got new header\n");
334
335 n = le32_to_cpu(*(__le32 *) m->rbuf); /* read packet size */
336 if (n >= m->client->msize) {
337 p9_debug(P9_DEBUG_ERROR,
338 "requested packet size too big: %d\n", n);
339 err = -EIO;
340 goto error;
341 }
342
343 tag = le16_to_cpu(*(__le16 *) (m->rbuf+5)); /* read tag */
344 p9_debug(P9_DEBUG_TRANS,
345 "mux %p pkt: size: %d bytes tag: %d\n", m, n, tag);
346
347 m->req = p9_tag_lookup(m->client, tag);
348 if (!m->req || (m->req->status != REQ_STATUS_SENT)) {
349 p9_debug(P9_DEBUG_ERROR, "Unexpected packet tag %d\n",
350 tag);
351 err = -EIO;
352 goto error;
353 }
354
355 if (m->req->rc == NULL) {
356 m->req->rc = kmalloc(sizeof(struct p9_fcall) +
357 m->client->msize, GFP_NOFS);
358 if (!m->req->rc) {
359 m->req = NULL;
360 err = -ENOMEM;
361 goto error;
362 }
363 }
364 m->rbuf = (char *)m->req->rc + sizeof(struct p9_fcall);
365 memcpy(m->rbuf, m->tmp_buf, m->rsize);
366 m->rsize = n;
367 }
368
369 /* not an else because some packets (like clunk) have no payload */
370 if ((m->req) && (m->rpos == m->rsize)) { /* packet is read in */
371 p9_debug(P9_DEBUG_TRANS, "got new packet\n");
372 spin_lock(&m->client->lock);
373 if (m->req->status != REQ_STATUS_ERROR)
374 status = REQ_STATUS_RCVD;
375 list_del(&m->req->req_list);
376 spin_unlock(&m->client->lock);
377 p9_client_cb(m->client, m->req, status);
378 m->rbuf = NULL;
379 m->rpos = 0;
380 m->rsize = 0;
381 m->req = NULL;
382 }
383
384 end_clear:
385 clear_bit(Rworksched, &m->wsched);
386
387 if (!list_empty(&m->req_list)) {
388 if (test_and_clear_bit(Rpending, &m->wsched))
389 n = POLLIN;
390 else
391 n = p9_fd_poll(m->client, NULL);
392
393 if ((n & POLLIN) && !test_and_set_bit(Rworksched, &m->wsched)) {
394 p9_debug(P9_DEBUG_TRANS, "sched read work %p\n", m);
395 schedule_work(&m->rq);
396 }
397 }
398
399 return;
400 error:
401 p9_conn_cancel(m, err);
402 clear_bit(Rworksched, &m->wsched);
403 }
404
405 /**
406 * p9_fd_write - write to a socket
407 * @client: client instance
408 * @v: buffer to send data from
409 * @len: size of send buffer
410 *
411 */
412
413 static int p9_fd_write(struct p9_client *client, void *v, int len)
414 {
415 int ret;
416 mm_segment_t oldfs;
417 struct p9_trans_fd *ts = NULL;
418
419 if (client && client->status != Disconnected)
420 ts = client->trans;
421
422 if (!ts)
423 return -EREMOTEIO;
424
425 if (!(ts->wr->f_flags & O_NONBLOCK))
426 p9_debug(P9_DEBUG_ERROR, "blocking write ...\n");
427
428 oldfs = get_fs();
429 set_fs(get_ds());
430 /* The cast to a user pointer is valid due to the set_fs() */
431 ret = vfs_write(ts->wr, (__force void __user *)v, len, &ts->wr->f_pos);
432 set_fs(oldfs);
433
434 if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
435 client->status = Disconnected;
436 return ret;
437 }
438
439 /**
440 * p9_write_work - called when a transport can send some data
441 * @work: container for work to be done
442 *
443 */
444
445 static void p9_write_work(struct work_struct *work)
446 {
447 int n, err;
448 struct p9_conn *m;
449 struct p9_req_t *req;
450
451 m = container_of(work, struct p9_conn, wq);
452
453 if (m->err < 0) {
454 clear_bit(Wworksched, &m->wsched);
455 return;
456 }
457
458 if (!m->wsize) {
459 spin_lock(&m->client->lock);
460 if (list_empty(&m->unsent_req_list)) {
461 clear_bit(Wworksched, &m->wsched);
462 spin_unlock(&m->client->lock);
463 return;
464 }
465
466 req = list_entry(m->unsent_req_list.next, struct p9_req_t,
467 req_list);
468 req->status = REQ_STATUS_SENT;
469 p9_debug(P9_DEBUG_TRANS, "move req %p\n", req);
470 list_move_tail(&req->req_list, &m->req_list);
471
472 m->wbuf = req->tc->sdata;
473 m->wsize = req->tc->size;
474 m->wpos = 0;
475 spin_unlock(&m->client->lock);
476 }
477
478 p9_debug(P9_DEBUG_TRANS, "mux %p pos %d size %d\n",
479 m, m->wpos, m->wsize);
480 clear_bit(Wpending, &m->wsched);
481 err = p9_fd_write(m->client, m->wbuf + m->wpos, m->wsize - m->wpos);
482 p9_debug(P9_DEBUG_TRANS, "mux %p sent %d bytes\n", m, err);
483 if (err == -EAGAIN)
484 goto end_clear;
485
486
487 if (err < 0)
488 goto error;
489 else if (err == 0) {
490 err = -EREMOTEIO;
491 goto error;
492 }
493
494 m->wpos += err;
495 if (m->wpos == m->wsize)
496 m->wpos = m->wsize = 0;
497
498 end_clear:
499 clear_bit(Wworksched, &m->wsched);
500
501 if (m->wsize || !list_empty(&m->unsent_req_list)) {
502 if (test_and_clear_bit(Wpending, &m->wsched))
503 n = POLLOUT;
504 else
505 n = p9_fd_poll(m->client, NULL);
506
507 if ((n & POLLOUT) &&
508 !test_and_set_bit(Wworksched, &m->wsched)) {
509 p9_debug(P9_DEBUG_TRANS, "sched write work %p\n", m);
510 schedule_work(&m->wq);
511 }
512 }
513
514 return;
515
516 error:
517 p9_conn_cancel(m, err);
518 clear_bit(Wworksched, &m->wsched);
519 }
520
521 static int p9_pollwake(wait_queue_t *wait, unsigned int mode, int sync, void *key)
522 {
523 struct p9_poll_wait *pwait =
524 container_of(wait, struct p9_poll_wait, wait);
525 struct p9_conn *m = pwait->conn;
526 unsigned long flags;
527
528 spin_lock_irqsave(&p9_poll_lock, flags);
529 if (list_empty(&m->poll_pending_link))
530 list_add_tail(&m->poll_pending_link, &p9_poll_pending_list);
531 spin_unlock_irqrestore(&p9_poll_lock, flags);
532
533 schedule_work(&p9_poll_work);
534 return 1;
535 }
536
537 /**
538 * p9_pollwait - add poll task to the wait queue
539 * @filp: file pointer being polled
540 * @wait_address: wait_q to block on
541 * @p: poll state
542 *
543 * called by files poll operation to add v9fs-poll task to files wait queue
544 */
545
546 static void
547 p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, poll_table *p)
548 {
549 struct p9_conn *m = container_of(p, struct p9_conn, pt);
550 struct p9_poll_wait *pwait = NULL;
551 int i;
552
553 for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {
554 if (m->poll_wait[i].wait_addr == NULL) {
555 pwait = &m->poll_wait[i];
556 break;
557 }
558 }
559
560 if (!pwait) {
561 p9_debug(P9_DEBUG_ERROR, "not enough wait_address slots\n");
562 return;
563 }
564
565 pwait->conn = m;
566 pwait->wait_addr = wait_address;
567 init_waitqueue_func_entry(&pwait->wait, p9_pollwake);
568 add_wait_queue(wait_address, &pwait->wait);
569 }
570
571 /**
572 * p9_conn_create - initialize the per-session mux data
573 * @client: client instance
574 *
575 * Note: Creates the polling task if this is the first session.
576 */
577
578 static void p9_conn_create(struct p9_client *client)
579 {
580 int n;
581 struct p9_trans_fd *ts = client->trans;
582 struct p9_conn *m = &ts->conn;
583
584 p9_debug(P9_DEBUG_TRANS, "client %p msize %d\n", client, client->msize);
585
586 INIT_LIST_HEAD(&m->mux_list);
587 m->client = client;
588
589 INIT_LIST_HEAD(&m->req_list);
590 INIT_LIST_HEAD(&m->unsent_req_list);
591 INIT_WORK(&m->rq, p9_read_work);
592 INIT_WORK(&m->wq, p9_write_work);
593 INIT_LIST_HEAD(&m->poll_pending_link);
594 init_poll_funcptr(&m->pt, p9_pollwait);
595
596 n = p9_fd_poll(client, &m->pt);
597 if (n & POLLIN) {
598 p9_debug(P9_DEBUG_TRANS, "mux %p can read\n", m);
599 set_bit(Rpending, &m->wsched);
600 }
601
602 if (n & POLLOUT) {
603 p9_debug(P9_DEBUG_TRANS, "mux %p can write\n", m);
604 set_bit(Wpending, &m->wsched);
605 }
606 }
607
608 /**
609 * p9_poll_mux - polls a mux and schedules read or write works if necessary
610 * @m: connection to poll
611 *
612 */
613
614 static void p9_poll_mux(struct p9_conn *m)
615 {
616 int n;
617
618 if (m->err < 0)
619 return;
620
621 n = p9_fd_poll(m->client, NULL);
622 if (n < 0 || n & (POLLERR | POLLHUP | POLLNVAL)) {
623 p9_debug(P9_DEBUG_TRANS, "error mux %p err %d\n", m, n);
624 if (n >= 0)
625 n = -ECONNRESET;
626 p9_conn_cancel(m, n);
627 }
628
629 if (n & POLLIN) {
630 set_bit(Rpending, &m->wsched);
631 p9_debug(P9_DEBUG_TRANS, "mux %p can read\n", m);
632 if (!test_and_set_bit(Rworksched, &m->wsched)) {
633 p9_debug(P9_DEBUG_TRANS, "sched read work %p\n", m);
634 schedule_work(&m->rq);
635 }
636 }
637
638 if (n & POLLOUT) {
639 set_bit(Wpending, &m->wsched);
640 p9_debug(P9_DEBUG_TRANS, "mux %p can write\n", m);
641 if ((m->wsize || !list_empty(&m->unsent_req_list)) &&
642 !test_and_set_bit(Wworksched, &m->wsched)) {
643 p9_debug(P9_DEBUG_TRANS, "sched write work %p\n", m);
644 schedule_work(&m->wq);
645 }
646 }
647 }
648
649 /**
650 * p9_fd_request - send 9P request
651 * The function can sleep until the request is scheduled for sending.
652 * The function can be interrupted. Return from the function is not
653 * a guarantee that the request is sent successfully.
654 *
655 * @client: client instance
656 * @req: request to be sent
657 *
658 */
659
660 static int p9_fd_request(struct p9_client *client, struct p9_req_t *req)
661 {
662 int n;
663 struct p9_trans_fd *ts = client->trans;
664 struct p9_conn *m = &ts->conn;
665
666 p9_debug(P9_DEBUG_TRANS, "mux %p task %p tcall %p id %d\n",
667 m, current, req->tc, req->tc->id);
668 if (m->err < 0)
669 return m->err;
670
671 spin_lock(&client->lock);
672 req->status = REQ_STATUS_UNSENT;
673 list_add_tail(&req->req_list, &m->unsent_req_list);
674 spin_unlock(&client->lock);
675
676 if (test_and_clear_bit(Wpending, &m->wsched))
677 n = POLLOUT;
678 else
679 n = p9_fd_poll(m->client, NULL);
680
681 if (n & POLLOUT && !test_and_set_bit(Wworksched, &m->wsched))
682 schedule_work(&m->wq);
683
684 return 0;
685 }
686
687 static int p9_fd_cancel(struct p9_client *client, struct p9_req_t *req)
688 {
689 int ret = 1;
690
691 p9_debug(P9_DEBUG_TRANS, "client %p req %p\n", client, req);
692
693 spin_lock(&client->lock);
694
695 if (req->status == REQ_STATUS_UNSENT) {
696 list_del(&req->req_list);
697 req->status = REQ_STATUS_FLSHD;
698 ret = 0;
699 }
700 spin_unlock(&client->lock);
701
702 return ret;
703 }
704
705 static int p9_fd_cancelled(struct p9_client *client, struct p9_req_t *req)
706 {
707 p9_debug(P9_DEBUG_TRANS, "client %p req %p\n", client, req);
708
709 /* we haven't received a response for oldreq,
710 * remove it from the list.
711 */
712 spin_lock(&client->lock);
713 list_del(&req->req_list);
714 spin_unlock(&client->lock);
715
716 return 0;
717 }
718
719 /**
720 * parse_opts - parse mount options into p9_fd_opts structure
721 * @params: options string passed from mount
722 * @opts: fd transport-specific structure to parse options into
723 *
724 * Returns 0 upon success, -ERRNO upon failure
725 */
726
727 static int parse_opts(char *params, struct p9_fd_opts *opts)
728 {
729 char *p;
730 substring_t args[MAX_OPT_ARGS];
731 int option;
732 char *options, *tmp_options;
733
734 opts->port = P9_PORT;
735 opts->rfd = ~0;
736 opts->wfd = ~0;
737 opts->privport = 0;
738
739 if (!params)
740 return 0;
741
742 tmp_options = kstrdup(params, GFP_KERNEL);
743 if (!tmp_options) {
744 p9_debug(P9_DEBUG_ERROR,
745 "failed to allocate copy of option string\n");
746 return -ENOMEM;
747 }
748 options = tmp_options;
749
750 while ((p = strsep(&options, ",")) != NULL) {
751 int token;
752 int r;
753 if (!*p)
754 continue;
755 token = match_token(p, tokens, args);
756 if ((token != Opt_err) && (token != Opt_privport)) {
757 r = match_int(&args[0], &option);
758 if (r < 0) {
759 p9_debug(P9_DEBUG_ERROR,
760 "integer field, but no integer?\n");
761 continue;
762 }
763 }
764 switch (token) {
765 case Opt_port:
766 opts->port = option;
767 break;
768 case Opt_rfdno:
769 opts->rfd = option;
770 break;
771 case Opt_wfdno:
772 opts->wfd = option;
773 break;
774 case Opt_privport:
775 opts->privport = 1;
776 break;
777 default:
778 continue;
779 }
780 }
781
782 kfree(tmp_options);
783 return 0;
784 }
785
786 static int p9_fd_open(struct p9_client *client, int rfd, int wfd)
787 {
788 struct p9_trans_fd *ts = kzalloc(sizeof(struct p9_trans_fd),
789 GFP_KERNEL);
790 if (!ts)
791 return -ENOMEM;
792
793 ts->rd = fget(rfd);
794 ts->wr = fget(wfd);
795 if (!ts->rd || !ts->wr) {
796 if (ts->rd)
797 fput(ts->rd);
798 if (ts->wr)
799 fput(ts->wr);
800 kfree(ts);
801 return -EIO;
802 }
803
804 client->trans = ts;
805 client->status = Connected;
806
807 return 0;
808 }
809
810 static int p9_socket_open(struct p9_client *client, struct socket *csocket)
811 {
812 struct p9_trans_fd *p;
813 struct file *file;
814
815 p = kzalloc(sizeof(struct p9_trans_fd), GFP_KERNEL);
816 if (!p)
817 return -ENOMEM;
818
819 csocket->sk->sk_allocation = GFP_NOIO;
820 file = sock_alloc_file(csocket, 0, NULL);
821 if (IS_ERR(file)) {
822 pr_err("%s (%d): failed to map fd\n",
823 __func__, task_pid_nr(current));
824 sock_release(csocket);
825 kfree(p);
826 return PTR_ERR(file);
827 }
828
829 get_file(file);
830 p->wr = p->rd = file;
831 client->trans = p;
832 client->status = Connected;
833
834 p->rd->f_flags |= O_NONBLOCK;
835
836 p9_conn_create(client);
837 return 0;
838 }
839
840 /**
841 * p9_mux_destroy - cancels all pending requests of mux
842 * @m: mux to destroy
843 *
844 */
845
846 static void p9_conn_destroy(struct p9_conn *m)
847 {
848 p9_debug(P9_DEBUG_TRANS, "mux %p prev %p next %p\n",
849 m, m->mux_list.prev, m->mux_list.next);
850
851 p9_mux_poll_stop(m);
852 cancel_work_sync(&m->rq);
853 cancel_work_sync(&m->wq);
854
855 p9_conn_cancel(m, -ECONNRESET);
856
857 m->client = NULL;
858 }
859
860 /**
861 * p9_fd_close - shutdown file descriptor transport
862 * @client: client instance
863 *
864 */
865
866 static void p9_fd_close(struct p9_client *client)
867 {
868 struct p9_trans_fd *ts;
869
870 if (!client)
871 return;
872
873 ts = client->trans;
874 if (!ts)
875 return;
876
877 client->status = Disconnected;
878
879 p9_conn_destroy(&ts->conn);
880
881 if (ts->rd)
882 fput(ts->rd);
883 if (ts->wr)
884 fput(ts->wr);
885
886 kfree(ts);
887 }
888
889 /*
890 * stolen from NFS - maybe should be made a generic function?
891 */
892 static inline int valid_ipaddr4(const char *buf)
893 {
894 int rc, count, in[4];
895
896 rc = sscanf(buf, "%d.%d.%d.%d", &in[0], &in[1], &in[2], &in[3]);
897 if (rc != 4)
898 return -EINVAL;
899 for (count = 0; count < 4; count++) {
900 if (in[count] > 255)
901 return -EINVAL;
902 }
903 return 0;
904 }
905
906 static int p9_bind_privport(struct socket *sock)
907 {
908 struct sockaddr_in cl;
909 int port, err = -EINVAL;
910
911 memset(&cl, 0, sizeof(cl));
912 cl.sin_family = AF_INET;
913 cl.sin_addr.s_addr = INADDR_ANY;
914 for (port = p9_ipport_resv_max; port >= p9_ipport_resv_min; port--) {
915 cl.sin_port = htons((ushort)port);
916 err = kernel_bind(sock, (struct sockaddr *)&cl, sizeof(cl));
917 if (err != -EADDRINUSE)
918 break;
919 }
920 return err;
921 }
922
923
924 static int
925 p9_fd_create_tcp(struct p9_client *client, const char *addr, char *args)
926 {
927 int err;
928 struct socket *csocket;
929 struct sockaddr_in sin_server;
930 struct p9_fd_opts opts;
931
932 err = parse_opts(args, &opts);
933 if (err < 0)
934 return err;
935
936 if (valid_ipaddr4(addr) < 0)
937 return -EINVAL;
938
939 csocket = NULL;
940
941 sin_server.sin_family = AF_INET;
942 sin_server.sin_addr.s_addr = in_aton(addr);
943 sin_server.sin_port = htons(opts.port);
944 err = __sock_create(current->nsproxy->net_ns, PF_INET,
945 SOCK_STREAM, IPPROTO_TCP, &csocket, 1);
946 if (err) {
947 pr_err("%s (%d): problem creating socket\n",
948 __func__, task_pid_nr(current));
949 return err;
950 }
951
952 if (opts.privport) {
953 err = p9_bind_privport(csocket);
954 if (err < 0) {
955 pr_err("%s (%d): problem binding to privport\n",
956 __func__, task_pid_nr(current));
957 sock_release(csocket);
958 return err;
959 }
960 }
961
962 err = csocket->ops->connect(csocket,
963 (struct sockaddr *)&sin_server,
964 sizeof(struct sockaddr_in), 0);
965 if (err < 0) {
966 pr_err("%s (%d): problem connecting socket to %s\n",
967 __func__, task_pid_nr(current), addr);
968 sock_release(csocket);
969 return err;
970 }
971
972 return p9_socket_open(client, csocket);
973 }
974
975 static int
976 p9_fd_create_unix(struct p9_client *client, const char *addr, char *args)
977 {
978 int err;
979 struct socket *csocket;
980 struct sockaddr_un sun_server;
981
982 csocket = NULL;
983
984 if (strlen(addr) >= UNIX_PATH_MAX) {
985 pr_err("%s (%d): address too long: %s\n",
986 __func__, task_pid_nr(current), addr);
987 return -ENAMETOOLONG;
988 }
989
990 sun_server.sun_family = PF_UNIX;
991 strcpy(sun_server.sun_path, addr);
992 err = __sock_create(current->nsproxy->net_ns, PF_UNIX,
993 SOCK_STREAM, 0, &csocket, 1);
994 if (err < 0) {
995 pr_err("%s (%d): problem creating socket\n",
996 __func__, task_pid_nr(current));
997
998 return err;
999 }
1000 err = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server,
1001 sizeof(struct sockaddr_un) - 1, 0);
1002 if (err < 0) {
1003 pr_err("%s (%d): problem connecting socket: %s: %d\n",
1004 __func__, task_pid_nr(current), addr, err);
1005 sock_release(csocket);
1006 return err;
1007 }
1008
1009 return p9_socket_open(client, csocket);
1010 }
1011
1012 static int
1013 p9_fd_create(struct p9_client *client, const char *addr, char *args)
1014 {
1015 int err;
1016 struct p9_fd_opts opts;
1017
1018 parse_opts(args, &opts);
1019
1020 if (opts.rfd == ~0 || opts.wfd == ~0) {
1021 pr_err("Insufficient options for proto=fd\n");
1022 return -ENOPROTOOPT;
1023 }
1024
1025 err = p9_fd_open(client, opts.rfd, opts.wfd);
1026 if (err < 0)
1027 return err;
1028
1029 p9_conn_create(client);
1030
1031 return 0;
1032 }
1033
1034 static struct p9_trans_module p9_tcp_trans = {
1035 .name = "tcp",
1036 .maxsize = MAX_SOCK_BUF,
1037 .def = 0,
1038 .create = p9_fd_create_tcp,
1039 .close = p9_fd_close,
1040 .request = p9_fd_request,
1041 .cancel = p9_fd_cancel,
1042 .cancelled = p9_fd_cancelled,
1043 .owner = THIS_MODULE,
1044 };
1045
1046 static struct p9_trans_module p9_unix_trans = {
1047 .name = "unix",
1048 .maxsize = MAX_SOCK_BUF,
1049 .def = 0,
1050 .create = p9_fd_create_unix,
1051 .close = p9_fd_close,
1052 .request = p9_fd_request,
1053 .cancel = p9_fd_cancel,
1054 .cancelled = p9_fd_cancelled,
1055 .owner = THIS_MODULE,
1056 };
1057
1058 static struct p9_trans_module p9_fd_trans = {
1059 .name = "fd",
1060 .maxsize = MAX_SOCK_BUF,
1061 .def = 0,
1062 .create = p9_fd_create,
1063 .close = p9_fd_close,
1064 .request = p9_fd_request,
1065 .cancel = p9_fd_cancel,
1066 .cancelled = p9_fd_cancelled,
1067 .owner = THIS_MODULE,
1068 };
1069
1070 /**
1071 * p9_poll_proc - poll worker thread
1072 * @a: thread state and arguments
1073 *
1074 * polls all v9fs transports for new events and queues the appropriate
1075 * work to the work queue
1076 *
1077 */
1078
1079 static void p9_poll_workfn(struct work_struct *work)
1080 {
1081 unsigned long flags;
1082
1083 p9_debug(P9_DEBUG_TRANS, "start %p\n", current);
1084
1085 spin_lock_irqsave(&p9_poll_lock, flags);
1086 while (!list_empty(&p9_poll_pending_list)) {
1087 struct p9_conn *conn = list_first_entry(&p9_poll_pending_list,
1088 struct p9_conn,
1089 poll_pending_link);
1090 list_del_init(&conn->poll_pending_link);
1091 spin_unlock_irqrestore(&p9_poll_lock, flags);
1092
1093 p9_poll_mux(conn);
1094
1095 spin_lock_irqsave(&p9_poll_lock, flags);
1096 }
1097 spin_unlock_irqrestore(&p9_poll_lock, flags);
1098
1099 p9_debug(P9_DEBUG_TRANS, "finish\n");
1100 }
1101
1102 int p9_trans_fd_init(void)
1103 {
1104 v9fs_register_trans(&p9_tcp_trans);
1105 v9fs_register_trans(&p9_unix_trans);
1106 v9fs_register_trans(&p9_fd_trans);
1107
1108 return 0;
1109 }
1110
1111 void p9_trans_fd_exit(void)
1112 {
1113 flush_work(&p9_poll_work);
1114 v9fs_unregister_trans(&p9_tcp_trans);
1115 v9fs_unregister_trans(&p9_unix_trans);
1116 v9fs_unregister_trans(&p9_fd_trans);
1117 }
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