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Linux/net/rxrpc/proc.c

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  1 /* proc.c: /proc interface for RxRPC
  2  *
  3  * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
  4  * Written by David Howells (dhowells@redhat.com)
  5  *
  6  * This program is free software; you can redistribute it and/or
  7  * modify it under the terms of the GNU General Public License
  8  * as published by the Free Software Foundation; either version
  9  * 2 of the License, or (at your option) any later version.
 10  */
 11 
 12 #include <linux/sched.h>
 13 #include <linux/slab.h>
 14 #include <linux/module.h>
 15 #include <linux/proc_fs.h>
 16 #include <linux/seq_file.h>
 17 #include <rxrpc/rxrpc.h>
 18 #include <rxrpc/transport.h>
 19 #include <rxrpc/peer.h>
 20 #include <rxrpc/connection.h>
 21 #include <rxrpc/call.h>
 22 #include <rxrpc/message.h>
 23 #include "internal.h"
 24 
 25 static struct proc_dir_entry *proc_rxrpc;
 26 
 27 static int rxrpc_proc_transports_open(struct inode *inode, struct file *file);
 28 static void *rxrpc_proc_transports_start(struct seq_file *p, loff_t *pos);
 29 static void *rxrpc_proc_transports_next(struct seq_file *p, void *v, loff_t *pos);
 30 static void rxrpc_proc_transports_stop(struct seq_file *p, void *v);
 31 static int rxrpc_proc_transports_show(struct seq_file *m, void *v);
 32 
 33 static struct seq_operations rxrpc_proc_transports_ops = {
 34         .start  = rxrpc_proc_transports_start,
 35         .next   = rxrpc_proc_transports_next,
 36         .stop   = rxrpc_proc_transports_stop,
 37         .show   = rxrpc_proc_transports_show,
 38 };
 39 
 40 static struct file_operations rxrpc_proc_transports_fops = {
 41         .open           = rxrpc_proc_transports_open,
 42         .read           = seq_read,
 43         .llseek         = seq_lseek,
 44         .release        = seq_release,
 45 };
 46 
 47 static int rxrpc_proc_peers_open(struct inode *inode, struct file *file);
 48 static void *rxrpc_proc_peers_start(struct seq_file *p, loff_t *pos);
 49 static void *rxrpc_proc_peers_next(struct seq_file *p, void *v, loff_t *pos);
 50 static void rxrpc_proc_peers_stop(struct seq_file *p, void *v);
 51 static int rxrpc_proc_peers_show(struct seq_file *m, void *v);
 52 
 53 static struct seq_operations rxrpc_proc_peers_ops = {
 54         .start  = rxrpc_proc_peers_start,
 55         .next   = rxrpc_proc_peers_next,
 56         .stop   = rxrpc_proc_peers_stop,
 57         .show   = rxrpc_proc_peers_show,
 58 };
 59 
 60 static struct file_operations rxrpc_proc_peers_fops = {
 61         .open           = rxrpc_proc_peers_open,
 62         .read           = seq_read,
 63         .llseek         = seq_lseek,
 64         .release        = seq_release,
 65 };
 66 
 67 static int rxrpc_proc_conns_open(struct inode *inode, struct file *file);
 68 static void *rxrpc_proc_conns_start(struct seq_file *p, loff_t *pos);
 69 static void *rxrpc_proc_conns_next(struct seq_file *p, void *v, loff_t *pos);
 70 static void rxrpc_proc_conns_stop(struct seq_file *p, void *v);
 71 static int rxrpc_proc_conns_show(struct seq_file *m, void *v);
 72 
 73 static struct seq_operations rxrpc_proc_conns_ops = {
 74         .start  = rxrpc_proc_conns_start,
 75         .next   = rxrpc_proc_conns_next,
 76         .stop   = rxrpc_proc_conns_stop,
 77         .show   = rxrpc_proc_conns_show,
 78 };
 79 
 80 static struct file_operations rxrpc_proc_conns_fops = {
 81         .open           = rxrpc_proc_conns_open,
 82         .read           = seq_read,
 83         .llseek         = seq_lseek,
 84         .release        = seq_release,
 85 };
 86 
 87 static int rxrpc_proc_calls_open(struct inode *inode, struct file *file);
 88 static void *rxrpc_proc_calls_start(struct seq_file *p, loff_t *pos);
 89 static void *rxrpc_proc_calls_next(struct seq_file *p, void *v, loff_t *pos);
 90 static void rxrpc_proc_calls_stop(struct seq_file *p, void *v);
 91 static int rxrpc_proc_calls_show(struct seq_file *m, void *v);
 92 
 93 static struct seq_operations rxrpc_proc_calls_ops = {
 94         .start  = rxrpc_proc_calls_start,
 95         .next   = rxrpc_proc_calls_next,
 96         .stop   = rxrpc_proc_calls_stop,
 97         .show   = rxrpc_proc_calls_show,
 98 };
 99 
100 static struct file_operations rxrpc_proc_calls_fops = {
101         .open           = rxrpc_proc_calls_open,
102         .read           = seq_read,
103         .llseek         = seq_lseek,
104         .release        = seq_release,
105 };
106 
107 static const char *rxrpc_call_states7[] = {
108         "complet",
109         "error  ",
110         "rcv_op ",
111         "rcv_arg",
112         "got_arg",
113         "snd_rpl",
114         "fin_ack",
115         "snd_arg",
116         "rcv_rpl",
117         "got_rpl"
118 };
119 
120 static const char *rxrpc_call_error_states7[] = {
121         "no_err ",
122         "loc_abt",
123         "rmt_abt",
124         "loc_err",
125         "rmt_err"
126 };
127 
128 /*****************************************************************************/
129 /*
130  * initialise the /proc/net/rxrpc/ directory
131  */
132 int rxrpc_proc_init(void)
133 {
134         struct proc_dir_entry *p;
135 
136         proc_rxrpc = proc_mkdir("rxrpc", proc_net);
137         if (!proc_rxrpc)
138                 goto error;
139         proc_rxrpc->owner = THIS_MODULE;
140 
141         p = create_proc_entry("calls", 0, proc_rxrpc);
142         if (!p)
143                 goto error_proc;
144         p->proc_fops = &rxrpc_proc_calls_fops;
145         p->owner = THIS_MODULE;
146 
147         p = create_proc_entry("connections", 0, proc_rxrpc);
148         if (!p)
149                 goto error_calls;
150         p->proc_fops = &rxrpc_proc_conns_fops;
151         p->owner = THIS_MODULE;
152 
153         p = create_proc_entry("peers", 0, proc_rxrpc);
154         if (!p)
155                 goto error_calls;
156         p->proc_fops = &rxrpc_proc_peers_fops;
157         p->owner = THIS_MODULE;
158 
159         p = create_proc_entry("transports", 0, proc_rxrpc);
160         if (!p)
161                 goto error_conns;
162         p->proc_fops = &rxrpc_proc_transports_fops;
163         p->owner = THIS_MODULE;
164 
165         return 0;
166 
167  error_conns:
168         remove_proc_entry("connections", proc_rxrpc);
169  error_calls:
170         remove_proc_entry("calls", proc_rxrpc);
171  error_proc:
172         remove_proc_entry("rxrpc", proc_net);
173  error:
174         return -ENOMEM;
175 } /* end rxrpc_proc_init() */
176 
177 /*****************************************************************************/
178 /*
179  * clean up the /proc/net/rxrpc/ directory
180  */
181 void rxrpc_proc_cleanup(void)
182 {
183         remove_proc_entry("transports", proc_rxrpc);
184         remove_proc_entry("peers", proc_rxrpc);
185         remove_proc_entry("connections", proc_rxrpc);
186         remove_proc_entry("calls", proc_rxrpc);
187 
188         remove_proc_entry("rxrpc", proc_net);
189 
190 } /* end rxrpc_proc_cleanup() */
191 
192 /*****************************************************************************/
193 /*
194  * open "/proc/net/rxrpc/transports" which provides a summary of extant transports
195  */
196 static int rxrpc_proc_transports_open(struct inode *inode, struct file *file)
197 {
198         struct seq_file *m;
199         int ret;
200 
201         ret = seq_open(file, &rxrpc_proc_transports_ops);
202         if (ret < 0)
203                 return ret;
204 
205         m = file->private_data;
206         m->private = PDE(inode)->data;
207 
208         return 0;
209 } /* end rxrpc_proc_transports_open() */
210 
211 /*****************************************************************************/
212 /*
213  * set up the iterator to start reading from the transports list and return the first item
214  */
215 static void *rxrpc_proc_transports_start(struct seq_file *m, loff_t *_pos)
216 {
217         struct list_head *_p;
218         loff_t pos = *_pos;
219 
220         /* lock the list against modification */
221         down_read(&rxrpc_proc_transports_sem);
222 
223         /* allow for the header line */
224         if (!pos)
225                 return SEQ_START_TOKEN;
226         pos--;
227 
228         /* find the n'th element in the list */
229         list_for_each(_p, &rxrpc_proc_transports)
230                 if (!pos--)
231                         break;
232 
233         return _p != &rxrpc_proc_transports ? _p : NULL;
234 } /* end rxrpc_proc_transports_start() */
235 
236 /*****************************************************************************/
237 /*
238  * move to next call in transports list
239  */
240 static void *rxrpc_proc_transports_next(struct seq_file *p, void *v, loff_t *pos)
241 {
242         struct list_head *_p;
243 
244         (*pos)++;
245 
246         _p = v;
247         _p = (v == SEQ_START_TOKEN) ? rxrpc_proc_transports.next : _p->next;
248 
249         return _p != &rxrpc_proc_transports ? _p : NULL;
250 } /* end rxrpc_proc_transports_next() */
251 
252 /*****************************************************************************/
253 /*
254  * clean up after reading from the transports list
255  */
256 static void rxrpc_proc_transports_stop(struct seq_file *p, void *v)
257 {
258         up_read(&rxrpc_proc_transports_sem);
259 
260 } /* end rxrpc_proc_transports_stop() */
261 
262 /*****************************************************************************/
263 /*
264  * display a header line followed by a load of call lines
265  */
266 static int rxrpc_proc_transports_show(struct seq_file *m, void *v)
267 {
268         struct rxrpc_transport *trans =
269                 list_entry(v, struct rxrpc_transport, proc_link);
270 
271         /* display header on line 1 */
272         if (v == SEQ_START_TOKEN) {
273                 seq_puts(m, "LOCAL USE\n");
274                 return 0;
275         }
276 
277         /* display one transport per line on subsequent lines */
278         seq_printf(m, "%5hu %3d\n",
279                    trans->port,
280                    atomic_read(&trans->usage)
281                    );
282 
283         return 0;
284 } /* end rxrpc_proc_transports_show() */
285 
286 /*****************************************************************************/
287 /*
288  * open "/proc/net/rxrpc/peers" which provides a summary of extant peers
289  */
290 static int rxrpc_proc_peers_open(struct inode *inode, struct file *file)
291 {
292         struct seq_file *m;
293         int ret;
294 
295         ret = seq_open(file, &rxrpc_proc_peers_ops);
296         if (ret < 0)
297                 return ret;
298 
299         m = file->private_data;
300         m->private = PDE(inode)->data;
301 
302         return 0;
303 } /* end rxrpc_proc_peers_open() */
304 
305 /*****************************************************************************/
306 /*
307  * set up the iterator to start reading from the peers list and return the
308  * first item
309  */
310 static void *rxrpc_proc_peers_start(struct seq_file *m, loff_t *_pos)
311 {
312         struct list_head *_p;
313         loff_t pos = *_pos;
314 
315         /* lock the list against modification */
316         down_read(&rxrpc_peers_sem);
317 
318         /* allow for the header line */
319         if (!pos)
320                 return SEQ_START_TOKEN;
321         pos--;
322 
323         /* find the n'th element in the list */
324         list_for_each(_p, &rxrpc_peers)
325                 if (!pos--)
326                         break;
327 
328         return _p != &rxrpc_peers ? _p : NULL;
329 } /* end rxrpc_proc_peers_start() */
330 
331 /*****************************************************************************/
332 /*
333  * move to next conn in peers list
334  */
335 static void *rxrpc_proc_peers_next(struct seq_file *p, void *v, loff_t *pos)
336 {
337         struct list_head *_p;
338 
339         (*pos)++;
340 
341         _p = v;
342         _p = (v == SEQ_START_TOKEN) ? rxrpc_peers.next : _p->next;
343 
344         return _p != &rxrpc_peers ? _p : NULL;
345 } /* end rxrpc_proc_peers_next() */
346 
347 /*****************************************************************************/
348 /*
349  * clean up after reading from the peers list
350  */
351 static void rxrpc_proc_peers_stop(struct seq_file *p, void *v)
352 {
353         up_read(&rxrpc_peers_sem);
354 
355 } /* end rxrpc_proc_peers_stop() */
356 
357 /*****************************************************************************/
358 /*
359  * display a header line followed by a load of conn lines
360  */
361 static int rxrpc_proc_peers_show(struct seq_file *m, void *v)
362 {
363         struct rxrpc_peer *peer = list_entry(v, struct rxrpc_peer, proc_link);
364         signed long timeout;
365 
366         /* display header on line 1 */
367         if (v == SEQ_START_TOKEN) {
368                 seq_puts(m, "LOCAL REMOTE   USAGE CONNS  TIMEOUT"
369                          "   MTU RTT(uS)\n");
370                 return 0;
371         }
372 
373         /* display one peer per line on subsequent lines */
374         timeout = 0;
375         if (!list_empty(&peer->timeout.link))
376                 timeout = (signed long) peer->timeout.timo_jif -
377                         (signed long) jiffies;
378 
379         seq_printf(m, "%5hu %08x %5d %5d %8ld %5Zu %7lu\n",
380                    peer->trans->port,
381                    ntohl(peer->addr.s_addr),
382                    atomic_read(&peer->usage),
383                    atomic_read(&peer->conn_count),
384                    timeout,
385                    peer->if_mtu,
386                    (long) peer->rtt
387                    );
388 
389         return 0;
390 } /* end rxrpc_proc_peers_show() */
391 
392 /*****************************************************************************/
393 /*
394  * open "/proc/net/rxrpc/connections" which provides a summary of extant
395  * connections
396  */
397 static int rxrpc_proc_conns_open(struct inode *inode, struct file *file)
398 {
399         struct seq_file *m;
400         int ret;
401 
402         ret = seq_open(file, &rxrpc_proc_conns_ops);
403         if (ret < 0)
404                 return ret;
405 
406         m = file->private_data;
407         m->private = PDE(inode)->data;
408 
409         return 0;
410 } /* end rxrpc_proc_conns_open() */
411 
412 /*****************************************************************************/
413 /*
414  * set up the iterator to start reading from the conns list and return the
415  * first item
416  */
417 static void *rxrpc_proc_conns_start(struct seq_file *m, loff_t *_pos)
418 {
419         struct list_head *_p;
420         loff_t pos = *_pos;
421 
422         /* lock the list against modification */
423         down_read(&rxrpc_conns_sem);
424 
425         /* allow for the header line */
426         if (!pos)
427                 return SEQ_START_TOKEN;
428         pos--;
429 
430         /* find the n'th element in the list */
431         list_for_each(_p, &rxrpc_conns)
432                 if (!pos--)
433                         break;
434 
435         return _p != &rxrpc_conns ? _p : NULL;
436 } /* end rxrpc_proc_conns_start() */
437 
438 /*****************************************************************************/
439 /*
440  * move to next conn in conns list
441  */
442 static void *rxrpc_proc_conns_next(struct seq_file *p, void *v, loff_t *pos)
443 {
444         struct list_head *_p;
445 
446         (*pos)++;
447 
448         _p = v;
449         _p = (v == SEQ_START_TOKEN) ? rxrpc_conns.next : _p->next;
450 
451         return _p != &rxrpc_conns ? _p : NULL;
452 } /* end rxrpc_proc_conns_next() */
453 
454 /*****************************************************************************/
455 /*
456  * clean up after reading from the conns list
457  */
458 static void rxrpc_proc_conns_stop(struct seq_file *p, void *v)
459 {
460         up_read(&rxrpc_conns_sem);
461 
462 } /* end rxrpc_proc_conns_stop() */
463 
464 /*****************************************************************************/
465 /*
466  * display a header line followed by a load of conn lines
467  */
468 static int rxrpc_proc_conns_show(struct seq_file *m, void *v)
469 {
470         struct rxrpc_connection *conn;
471         signed long timeout;
472 
473         conn = list_entry(v, struct rxrpc_connection, proc_link);
474 
475         /* display header on line 1 */
476         if (v == SEQ_START_TOKEN) {
477                 seq_puts(m,
478                          "LOCAL REMOTE   RPORT SRVC CONN     END SERIALNO "
479                          "CALLNO     MTU  TIMEOUT"
480                          "\n");
481                 return 0;
482         }
483 
484         /* display one conn per line on subsequent lines */
485         timeout = 0;
486         if (!list_empty(&conn->timeout.link))
487                 timeout = (signed long) conn->timeout.timo_jif -
488                         (signed long) jiffies;
489 
490         seq_printf(m,
491                    "%5hu %08x %5hu %04hx %08x %-3.3s %08x %08x %5Zu %8ld\n",
492                    conn->trans->port,
493                    ntohl(conn->addr.sin_addr.s_addr),
494                    ntohs(conn->addr.sin_port),
495                    ntohs(conn->service_id),
496                    ntohl(conn->conn_id),
497                    conn->out_clientflag ? "CLT" : "SRV",
498                    conn->serial_counter,
499                    conn->call_counter,
500                    conn->mtu_size,
501                    timeout
502                    );
503 
504         return 0;
505 } /* end rxrpc_proc_conns_show() */
506 
507 /*****************************************************************************/
508 /*
509  * open "/proc/net/rxrpc/calls" which provides a summary of extant calls
510  */
511 static int rxrpc_proc_calls_open(struct inode *inode, struct file *file)
512 {
513         struct seq_file *m;
514         int ret;
515 
516         ret = seq_open(file, &rxrpc_proc_calls_ops);
517         if (ret < 0)
518                 return ret;
519 
520         m = file->private_data;
521         m->private = PDE(inode)->data;
522 
523         return 0;
524 } /* end rxrpc_proc_calls_open() */
525 
526 /*****************************************************************************/
527 /*
528  * set up the iterator to start reading from the calls list and return the
529  * first item
530  */
531 static void *rxrpc_proc_calls_start(struct seq_file *m, loff_t *_pos)
532 {
533         struct list_head *_p;
534         loff_t pos = *_pos;
535 
536         /* lock the list against modification */
537         down_read(&rxrpc_calls_sem);
538 
539         /* allow for the header line */
540         if (!pos)
541                 return SEQ_START_TOKEN;
542         pos--;
543 
544         /* find the n'th element in the list */
545         list_for_each(_p, &rxrpc_calls)
546                 if (!pos--)
547                         break;
548 
549         return _p != &rxrpc_calls ? _p : NULL;
550 } /* end rxrpc_proc_calls_start() */
551 
552 /*****************************************************************************/
553 /*
554  * move to next call in calls list
555  */
556 static void *rxrpc_proc_calls_next(struct seq_file *p, void *v, loff_t *pos)
557 {
558         struct list_head *_p;
559 
560         (*pos)++;
561 
562         _p = v;
563         _p = (v == SEQ_START_TOKEN) ? rxrpc_calls.next : _p->next;
564 
565         return _p != &rxrpc_calls ? _p : NULL;
566 } /* end rxrpc_proc_calls_next() */
567 
568 /*****************************************************************************/
569 /*
570  * clean up after reading from the calls list
571  */
572 static void rxrpc_proc_calls_stop(struct seq_file *p, void *v)
573 {
574         up_read(&rxrpc_calls_sem);
575 
576 } /* end rxrpc_proc_calls_stop() */
577 
578 /*****************************************************************************/
579 /*
580  * display a header line followed by a load of call lines
581  */
582 static int rxrpc_proc_calls_show(struct seq_file *m, void *v)
583 {
584         struct rxrpc_call *call = list_entry(v, struct rxrpc_call, call_link);
585 
586         /* display header on line 1 */
587         if (v == SEQ_START_TOKEN) {
588                 seq_puts(m,
589                          "LOCAL REMOT SRVC CONN     CALL     DIR USE "
590                          " L STATE   OPCODE ABORT    ERRNO\n"
591                          );
592                 return 0;
593         }
594 
595         /* display one call per line on subsequent lines */
596         seq_printf(m,
597                    "%5hu %5hu %04hx %08x %08x %s %3u%c"
598                    " %c %-7.7s %6d %08x %5d\n",
599                    call->conn->trans->port,
600                    ntohs(call->conn->addr.sin_port),
601                    ntohs(call->conn->service_id),
602                    ntohl(call->conn->conn_id),
603                    ntohl(call->call_id),
604                    call->conn->service ? "SVC" : "CLT",
605                    atomic_read(&call->usage),
606                    waitqueue_active(&call->waitq) ? 'w' : ' ',
607                    call->app_last_rcv ? 'Y' : '-',
608                    (call->app_call_state!=RXRPC_CSTATE_ERROR ?
609                     rxrpc_call_states7[call->app_call_state] :
610                     rxrpc_call_error_states7[call->app_err_state]),
611                    call->app_opcode,
612                    call->app_abort_code,
613                    call->app_errno
614                    );
615 
616         return 0;
617 } /* end rxrpc_proc_calls_show() */
618 

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