microblaze: uaccess: fix put_user and get_user macros
[linux-2.6.git] / net / bridge / br_sysfs_br.c
1 /*
2  *      Sysfs attributes of bridge ports
3  *      Linux ethernet bridge
4  *
5  *      Authors:
6  *      Stephen Hemminger               <shemminger@osdl.org>
7  *
8  *      This program is free software; you can redistribute it and/or
9  *      modify it under the terms of the GNU General Public License
10  *      as published by the Free Software Foundation; either version
11  *      2 of the License, or (at your option) any later version.
12  */
13
14 #include <linux/capability.h>
15 #include <linux/kernel.h>
16 #include <linux/netdevice.h>
17 #include <linux/if_bridge.h>
18 #include <linux/rtnetlink.h>
19 #include <linux/spinlock.h>
20 #include <linux/times.h>
21
22 #include "br_private.h"
23
24 #define to_dev(obj)     container_of(obj, struct device, kobj)
25 #define to_bridge(cd)   ((struct net_bridge *)netdev_priv(to_net_dev(cd)))
26
27 /*
28  * Common code for storing bridge parameters.
29  */
30 static ssize_t store_bridge_parm(struct device *d,
31                                  const char *buf, size_t len,
32                                  int (*set)(struct net_bridge *, unsigned long))
33 {
34         struct net_bridge *br = to_bridge(d);
35         char *endp;
36         unsigned long val;
37         int err;
38
39         if (!capable(CAP_NET_ADMIN))
40                 return -EPERM;
41
42         val = simple_strtoul(buf, &endp, 0);
43         if (endp == buf)
44                 return -EINVAL;
45
46         spin_lock_bh(&br->lock);
47         err = (*set)(br, val);
48         spin_unlock_bh(&br->lock);
49         return err ? err : len;
50 }
51
52
53 static ssize_t show_forward_delay(struct device *d,
54                                   struct device_attribute *attr, char *buf)
55 {
56         struct net_bridge *br = to_bridge(d);
57         return sprintf(buf, "%lu\n", jiffies_to_clock_t(br->forward_delay));
58 }
59
60 static int set_forward_delay(struct net_bridge *br, unsigned long val)
61 {
62         unsigned long delay = clock_t_to_jiffies(val);
63         br->forward_delay = delay;
64         if (br_is_root_bridge(br))
65                 br->bridge_forward_delay = delay;
66         return 0;
67 }
68
69 static ssize_t store_forward_delay(struct device *d,
70                                    struct device_attribute *attr,
71                                    const char *buf, size_t len)
72 {
73         return store_bridge_parm(d, buf, len, set_forward_delay);
74 }
75 static DEVICE_ATTR(forward_delay, S_IRUGO | S_IWUSR,
76                    show_forward_delay, store_forward_delay);
77
78 static ssize_t show_hello_time(struct device *d, struct device_attribute *attr,
79                                char *buf)
80 {
81         return sprintf(buf, "%lu\n",
82                        jiffies_to_clock_t(to_bridge(d)->hello_time));
83 }
84
85 static int set_hello_time(struct net_bridge *br, unsigned long val)
86 {
87         unsigned long t = clock_t_to_jiffies(val);
88
89         if (t < HZ)
90                 return -EINVAL;
91
92         br->hello_time = t;
93         if (br_is_root_bridge(br))
94                 br->bridge_hello_time = t;
95         return 0;
96 }
97
98 static ssize_t store_hello_time(struct device *d,
99                                 struct device_attribute *attr, const char *buf,
100                                 size_t len)
101 {
102         return store_bridge_parm(d, buf, len, set_hello_time);
103 }
104 static DEVICE_ATTR(hello_time, S_IRUGO | S_IWUSR, show_hello_time,
105                    store_hello_time);
106
107 static ssize_t show_max_age(struct device *d, struct device_attribute *attr,
108                             char *buf)
109 {
110         return sprintf(buf, "%lu\n",
111                        jiffies_to_clock_t(to_bridge(d)->max_age));
112 }
113
114 static int set_max_age(struct net_bridge *br, unsigned long val)
115 {
116         unsigned long t = clock_t_to_jiffies(val);
117         br->max_age = t;
118         if (br_is_root_bridge(br))
119                 br->bridge_max_age = t;
120         return 0;
121 }
122
123 static ssize_t store_max_age(struct device *d, struct device_attribute *attr,
124                              const char *buf, size_t len)
125 {
126         return store_bridge_parm(d, buf, len, set_max_age);
127 }
128 static DEVICE_ATTR(max_age, S_IRUGO | S_IWUSR, show_max_age, store_max_age);
129
130 static ssize_t show_ageing_time(struct device *d,
131                                 struct device_attribute *attr, char *buf)
132 {
133         struct net_bridge *br = to_bridge(d);
134         return sprintf(buf, "%lu\n", jiffies_to_clock_t(br->ageing_time));
135 }
136
137 static int set_ageing_time(struct net_bridge *br, unsigned long val)
138 {
139         br->ageing_time = clock_t_to_jiffies(val);
140         return 0;
141 }
142
143 static ssize_t store_ageing_time(struct device *d,
144                                  struct device_attribute *attr,
145                                  const char *buf, size_t len)
146 {
147         return store_bridge_parm(d, buf, len, set_ageing_time);
148 }
149 static DEVICE_ATTR(ageing_time, S_IRUGO | S_IWUSR, show_ageing_time,
150                    store_ageing_time);
151
152 static ssize_t show_stp_state(struct device *d,
153                               struct device_attribute *attr, char *buf)
154 {
155         struct net_bridge *br = to_bridge(d);
156         return sprintf(buf, "%d\n", br->stp_enabled);
157 }
158
159
160 static ssize_t store_stp_state(struct device *d,
161                                struct device_attribute *attr, const char *buf,
162                                size_t len)
163 {
164         struct net_bridge *br = to_bridge(d);
165         char *endp;
166         unsigned long val;
167
168         if (!capable(CAP_NET_ADMIN))
169                 return -EPERM;
170
171         val = simple_strtoul(buf, &endp, 0);
172         if (endp == buf)
173                 return -EINVAL;
174
175         if (!rtnl_trylock())
176                 return restart_syscall();
177         br_stp_set_enabled(br, val);
178         rtnl_unlock();
179
180         return len;
181 }
182 static DEVICE_ATTR(stp_state, S_IRUGO | S_IWUSR, show_stp_state,
183                    store_stp_state);
184
185 static ssize_t show_priority(struct device *d, struct device_attribute *attr,
186                              char *buf)
187 {
188         struct net_bridge *br = to_bridge(d);
189         return sprintf(buf, "%d\n",
190                        (br->bridge_id.prio[0] << 8) | br->bridge_id.prio[1]);
191 }
192
193 static int set_priority(struct net_bridge *br, unsigned long val)
194 {
195         br_stp_set_bridge_priority(br, (u16) val);
196         return 0;
197 }
198
199 static ssize_t store_priority(struct device *d, struct device_attribute *attr,
200                                const char *buf, size_t len)
201 {
202         return store_bridge_parm(d, buf, len, set_priority);
203 }
204 static DEVICE_ATTR(priority, S_IRUGO | S_IWUSR, show_priority, store_priority);
205
206 static ssize_t show_root_id(struct device *d, struct device_attribute *attr,
207                             char *buf)
208 {
209         return br_show_bridge_id(buf, &to_bridge(d)->designated_root);
210 }
211 static DEVICE_ATTR(root_id, S_IRUGO, show_root_id, NULL);
212
213 static ssize_t show_bridge_id(struct device *d, struct device_attribute *attr,
214                               char *buf)
215 {
216         return br_show_bridge_id(buf, &to_bridge(d)->bridge_id);
217 }
218 static DEVICE_ATTR(bridge_id, S_IRUGO, show_bridge_id, NULL);
219
220 static ssize_t show_root_port(struct device *d, struct device_attribute *attr,
221                               char *buf)
222 {
223         return sprintf(buf, "%d\n", to_bridge(d)->root_port);
224 }
225 static DEVICE_ATTR(root_port, S_IRUGO, show_root_port, NULL);
226
227 static ssize_t show_root_path_cost(struct device *d,
228                                    struct device_attribute *attr, char *buf)
229 {
230         return sprintf(buf, "%d\n", to_bridge(d)->root_path_cost);
231 }
232 static DEVICE_ATTR(root_path_cost, S_IRUGO, show_root_path_cost, NULL);
233
234 static ssize_t show_topology_change(struct device *d,
235                                     struct device_attribute *attr, char *buf)
236 {
237         return sprintf(buf, "%d\n", to_bridge(d)->topology_change);
238 }
239 static DEVICE_ATTR(topology_change, S_IRUGO, show_topology_change, NULL);
240
241 static ssize_t show_topology_change_detected(struct device *d,
242                                              struct device_attribute *attr,
243                                              char *buf)
244 {
245         struct net_bridge *br = to_bridge(d);
246         return sprintf(buf, "%d\n", br->topology_change_detected);
247 }
248 static DEVICE_ATTR(topology_change_detected, S_IRUGO,
249                    show_topology_change_detected, NULL);
250
251 static ssize_t show_hello_timer(struct device *d,
252                                 struct device_attribute *attr, char *buf)
253 {
254         struct net_bridge *br = to_bridge(d);
255         return sprintf(buf, "%ld\n", br_timer_value(&br->hello_timer));
256 }
257 static DEVICE_ATTR(hello_timer, S_IRUGO, show_hello_timer, NULL);
258
259 static ssize_t show_tcn_timer(struct device *d, struct device_attribute *attr,
260                               char *buf)
261 {
262         struct net_bridge *br = to_bridge(d);
263         return sprintf(buf, "%ld\n", br_timer_value(&br->tcn_timer));
264 }
265 static DEVICE_ATTR(tcn_timer, S_IRUGO, show_tcn_timer, NULL);
266
267 static ssize_t show_topology_change_timer(struct device *d,
268                                           struct device_attribute *attr,
269                                           char *buf)
270 {
271         struct net_bridge *br = to_bridge(d);
272         return sprintf(buf, "%ld\n", br_timer_value(&br->topology_change_timer));
273 }
274 static DEVICE_ATTR(topology_change_timer, S_IRUGO, show_topology_change_timer,
275                    NULL);
276
277 static ssize_t show_gc_timer(struct device *d, struct device_attribute *attr,
278                              char *buf)
279 {
280         struct net_bridge *br = to_bridge(d);
281         return sprintf(buf, "%ld\n", br_timer_value(&br->gc_timer));
282 }
283 static DEVICE_ATTR(gc_timer, S_IRUGO, show_gc_timer, NULL);
284
285 static ssize_t show_group_addr(struct device *d,
286                                struct device_attribute *attr, char *buf)
287 {
288         struct net_bridge *br = to_bridge(d);
289         return sprintf(buf, "%x:%x:%x:%x:%x:%x\n",
290                        br->group_addr[0], br->group_addr[1],
291                        br->group_addr[2], br->group_addr[3],
292                        br->group_addr[4], br->group_addr[5]);
293 }
294
295 static ssize_t store_group_addr(struct device *d,
296                                 struct device_attribute *attr,
297                                 const char *buf, size_t len)
298 {
299         struct net_bridge *br = to_bridge(d);
300         unsigned new_addr[6];
301         int i;
302
303         if (!capable(CAP_NET_ADMIN))
304                 return -EPERM;
305
306         if (sscanf(buf, "%x:%x:%x:%x:%x:%x",
307                    &new_addr[0], &new_addr[1], &new_addr[2],
308                    &new_addr[3], &new_addr[4], &new_addr[5]) != 6)
309                 return -EINVAL;
310
311         /* Must be 01:80:c2:00:00:0X */
312         for (i = 0; i < 5; i++)
313                 if (new_addr[i] != br_group_address[i])
314                         return -EINVAL;
315
316         if (new_addr[5] & ~0xf)
317                 return -EINVAL;
318
319         if (new_addr[5] == 1 ||         /* 802.3x Pause address */
320             new_addr[5] == 2 ||         /* 802.3ad Slow protocols */
321             new_addr[5] == 3)           /* 802.1X PAE address */
322                 return -EINVAL;
323
324         spin_lock_bh(&br->lock);
325         for (i = 0; i < 6; i++)
326                 br->group_addr[i] = new_addr[i];
327         spin_unlock_bh(&br->lock);
328         return len;
329 }
330
331 static DEVICE_ATTR(group_addr, S_IRUGO | S_IWUSR,
332                    show_group_addr, store_group_addr);
333
334 static ssize_t store_flush(struct device *d,
335                            struct device_attribute *attr,
336                            const char *buf, size_t len)
337 {
338         struct net_bridge *br = to_bridge(d);
339
340         if (!capable(CAP_NET_ADMIN))
341                 return -EPERM;
342
343         br_fdb_flush(br);
344         return len;
345 }
346 static DEVICE_ATTR(flush, S_IWUSR, NULL, store_flush);
347
348 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
349 static ssize_t show_multicast_router(struct device *d,
350                                      struct device_attribute *attr, char *buf)
351 {
352         struct net_bridge *br = to_bridge(d);
353         return sprintf(buf, "%d\n", br->multicast_router);
354 }
355
356 static ssize_t store_multicast_router(struct device *d,
357                                       struct device_attribute *attr,
358                                       const char *buf, size_t len)
359 {
360         return store_bridge_parm(d, buf, len, br_multicast_set_router);
361 }
362 static DEVICE_ATTR(multicast_router, S_IRUGO | S_IWUSR, show_multicast_router,
363                    store_multicast_router);
364
365 static ssize_t show_multicast_snooping(struct device *d,
366                                        struct device_attribute *attr,
367                                        char *buf)
368 {
369         struct net_bridge *br = to_bridge(d);
370         return sprintf(buf, "%d\n", !br->multicast_disabled);
371 }
372
373 static ssize_t store_multicast_snooping(struct device *d,
374                                         struct device_attribute *attr,
375                                         const char *buf, size_t len)
376 {
377         return store_bridge_parm(d, buf, len, br_multicast_toggle);
378 }
379 static DEVICE_ATTR(multicast_snooping, S_IRUGO | S_IWUSR,
380                    show_multicast_snooping, store_multicast_snooping);
381
382 static ssize_t show_hash_elasticity(struct device *d,
383                                     struct device_attribute *attr, char *buf)
384 {
385         struct net_bridge *br = to_bridge(d);
386         return sprintf(buf, "%u\n", br->hash_elasticity);
387 }
388
389 static int set_elasticity(struct net_bridge *br, unsigned long val)
390 {
391         br->hash_elasticity = val;
392         return 0;
393 }
394
395 static ssize_t store_hash_elasticity(struct device *d,
396                                      struct device_attribute *attr,
397                                      const char *buf, size_t len)
398 {
399         return store_bridge_parm(d, buf, len, set_elasticity);
400 }
401 static DEVICE_ATTR(hash_elasticity, S_IRUGO | S_IWUSR, show_hash_elasticity,
402                    store_hash_elasticity);
403
404 static ssize_t show_hash_max(struct device *d, struct device_attribute *attr,
405                              char *buf)
406 {
407         struct net_bridge *br = to_bridge(d);
408         return sprintf(buf, "%u\n", br->hash_max);
409 }
410
411 static ssize_t store_hash_max(struct device *d, struct device_attribute *attr,
412                               const char *buf, size_t len)
413 {
414         return store_bridge_parm(d, buf, len, br_multicast_set_hash_max);
415 }
416 static DEVICE_ATTR(hash_max, S_IRUGO | S_IWUSR, show_hash_max,
417                    store_hash_max);
418
419 static ssize_t show_multicast_last_member_count(struct device *d,
420                                                 struct device_attribute *attr,
421                                                 char *buf)
422 {
423         struct net_bridge *br = to_bridge(d);
424         return sprintf(buf, "%u\n", br->multicast_last_member_count);
425 }
426
427 static int set_last_member_count(struct net_bridge *br, unsigned long val)
428 {
429         br->multicast_last_member_count = val;
430         return 0;
431 }
432
433 static ssize_t store_multicast_last_member_count(struct device *d,
434                                                  struct device_attribute *attr,
435                                                  const char *buf, size_t len)
436 {
437         return store_bridge_parm(d, buf, len, set_last_member_count);
438 }
439 static DEVICE_ATTR(multicast_last_member_count, S_IRUGO | S_IWUSR,
440                    show_multicast_last_member_count,
441                    store_multicast_last_member_count);
442
443 static ssize_t show_multicast_startup_query_count(
444         struct device *d, struct device_attribute *attr, char *buf)
445 {
446         struct net_bridge *br = to_bridge(d);
447         return sprintf(buf, "%u\n", br->multicast_startup_query_count);
448 }
449
450 static int set_startup_query_count(struct net_bridge *br, unsigned long val)
451 {
452         br->multicast_startup_query_count = val;
453         return 0;
454 }
455
456 static ssize_t store_multicast_startup_query_count(
457         struct device *d, struct device_attribute *attr, const char *buf,
458         size_t len)
459 {
460         return store_bridge_parm(d, buf, len, set_startup_query_count);
461 }
462 static DEVICE_ATTR(multicast_startup_query_count, S_IRUGO | S_IWUSR,
463                    show_multicast_startup_query_count,
464                    store_multicast_startup_query_count);
465
466 static ssize_t show_multicast_last_member_interval(
467         struct device *d, struct device_attribute *attr, char *buf)
468 {
469         struct net_bridge *br = to_bridge(d);
470         return sprintf(buf, "%lu\n",
471                        jiffies_to_clock_t(br->multicast_last_member_interval));
472 }
473
474 static int set_last_member_interval(struct net_bridge *br, unsigned long val)
475 {
476         br->multicast_last_member_interval = clock_t_to_jiffies(val);
477         return 0;
478 }
479
480 static ssize_t store_multicast_last_member_interval(
481         struct device *d, struct device_attribute *attr, const char *buf,
482         size_t len)
483 {
484         return store_bridge_parm(d, buf, len, set_last_member_interval);
485 }
486 static DEVICE_ATTR(multicast_last_member_interval, S_IRUGO | S_IWUSR,
487                    show_multicast_last_member_interval,
488                    store_multicast_last_member_interval);
489
490 static ssize_t show_multicast_membership_interval(
491         struct device *d, struct device_attribute *attr, char *buf)
492 {
493         struct net_bridge *br = to_bridge(d);
494         return sprintf(buf, "%lu\n",
495                        jiffies_to_clock_t(br->multicast_membership_interval));
496 }
497
498 static int set_membership_interval(struct net_bridge *br, unsigned long val)
499 {
500         br->multicast_membership_interval = clock_t_to_jiffies(val);
501         return 0;
502 }
503
504 static ssize_t store_multicast_membership_interval(
505         struct device *d, struct device_attribute *attr, const char *buf,
506         size_t len)
507 {
508         return store_bridge_parm(d, buf, len, set_membership_interval);
509 }
510 static DEVICE_ATTR(multicast_membership_interval, S_IRUGO | S_IWUSR,
511                    show_multicast_membership_interval,
512                    store_multicast_membership_interval);
513
514 static ssize_t show_multicast_querier_interval(struct device *d,
515                                                struct device_attribute *attr,
516                                                char *buf)
517 {
518         struct net_bridge *br = to_bridge(d);
519         return sprintf(buf, "%lu\n",
520                        jiffies_to_clock_t(br->multicast_querier_interval));
521 }
522
523 static int set_querier_interval(struct net_bridge *br, unsigned long val)
524 {
525         br->multicast_querier_interval = clock_t_to_jiffies(val);
526         return 0;
527 }
528
529 static ssize_t store_multicast_querier_interval(struct device *d,
530                                                 struct device_attribute *attr,
531                                                 const char *buf, size_t len)
532 {
533         return store_bridge_parm(d, buf, len, set_querier_interval);
534 }
535 static DEVICE_ATTR(multicast_querier_interval, S_IRUGO | S_IWUSR,
536                    show_multicast_querier_interval,
537                    store_multicast_querier_interval);
538
539 static ssize_t show_multicast_query_interval(struct device *d,
540                                              struct device_attribute *attr,
541                                              char *buf)
542 {
543         struct net_bridge *br = to_bridge(d);
544         return sprintf(buf, "%lu\n",
545                        jiffies_to_clock_t(br->multicast_query_interval));
546 }
547
548 static int set_query_interval(struct net_bridge *br, unsigned long val)
549 {
550         br->multicast_query_interval = clock_t_to_jiffies(val);
551         return 0;
552 }
553
554 static ssize_t store_multicast_query_interval(struct device *d,
555                                               struct device_attribute *attr,
556                                               const char *buf, size_t len)
557 {
558         return store_bridge_parm(d, buf, len, set_query_interval);
559 }
560 static DEVICE_ATTR(multicast_query_interval, S_IRUGO | S_IWUSR,
561                    show_multicast_query_interval,
562                    store_multicast_query_interval);
563
564 static ssize_t show_multicast_query_response_interval(
565         struct device *d, struct device_attribute *attr, char *buf)
566 {
567         struct net_bridge *br = to_bridge(d);
568         return sprintf(
569                 buf, "%lu\n",
570                 jiffies_to_clock_t(br->multicast_query_response_interval));
571 }
572
573 static int set_query_response_interval(struct net_bridge *br, unsigned long val)
574 {
575         br->multicast_query_response_interval = clock_t_to_jiffies(val);
576         return 0;
577 }
578
579 static ssize_t store_multicast_query_response_interval(
580         struct device *d, struct device_attribute *attr, const char *buf,
581         size_t len)
582 {
583         return store_bridge_parm(d, buf, len, set_query_response_interval);
584 }
585 static DEVICE_ATTR(multicast_query_response_interval, S_IRUGO | S_IWUSR,
586                    show_multicast_query_response_interval,
587                    store_multicast_query_response_interval);
588
589 static ssize_t show_multicast_startup_query_interval(
590         struct device *d, struct device_attribute *attr, char *buf)
591 {
592         struct net_bridge *br = to_bridge(d);
593         return sprintf(
594                 buf, "%lu\n",
595                 jiffies_to_clock_t(br->multicast_startup_query_interval));
596 }
597
598 static int set_startup_query_interval(struct net_bridge *br, unsigned long val)
599 {
600         br->multicast_startup_query_interval = clock_t_to_jiffies(val);
601         return 0;
602 }
603
604 static ssize_t store_multicast_startup_query_interval(
605         struct device *d, struct device_attribute *attr, const char *buf,
606         size_t len)
607 {
608         return store_bridge_parm(d, buf, len, set_startup_query_interval);
609 }
610 static DEVICE_ATTR(multicast_startup_query_interval, S_IRUGO | S_IWUSR,
611                    show_multicast_startup_query_interval,
612                    store_multicast_startup_query_interval);
613 #endif
614
615 static struct attribute *bridge_attrs[] = {
616         &dev_attr_forward_delay.attr,
617         &dev_attr_hello_time.attr,
618         &dev_attr_max_age.attr,
619         &dev_attr_ageing_time.attr,
620         &dev_attr_stp_state.attr,
621         &dev_attr_priority.attr,
622         &dev_attr_bridge_id.attr,
623         &dev_attr_root_id.attr,
624         &dev_attr_root_path_cost.attr,
625         &dev_attr_root_port.attr,
626         &dev_attr_topology_change.attr,
627         &dev_attr_topology_change_detected.attr,
628         &dev_attr_hello_timer.attr,
629         &dev_attr_tcn_timer.attr,
630         &dev_attr_topology_change_timer.attr,
631         &dev_attr_gc_timer.attr,
632         &dev_attr_group_addr.attr,
633         &dev_attr_flush.attr,
634 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
635         &dev_attr_multicast_router.attr,
636         &dev_attr_multicast_snooping.attr,
637         &dev_attr_hash_elasticity.attr,
638         &dev_attr_hash_max.attr,
639         &dev_attr_multicast_last_member_count.attr,
640         &dev_attr_multicast_startup_query_count.attr,
641         &dev_attr_multicast_last_member_interval.attr,
642         &dev_attr_multicast_membership_interval.attr,
643         &dev_attr_multicast_querier_interval.attr,
644         &dev_attr_multicast_query_interval.attr,
645         &dev_attr_multicast_query_response_interval.attr,
646         &dev_attr_multicast_startup_query_interval.attr,
647 #endif
648         NULL
649 };
650
651 static struct attribute_group bridge_group = {
652         .name = SYSFS_BRIDGE_ATTR,
653         .attrs = bridge_attrs,
654 };
655
656 /*
657  * Export the forwarding information table as a binary file
658  * The records are struct __fdb_entry.
659  *
660  * Returns the number of bytes read.
661  */
662 static ssize_t brforward_read(struct kobject *kobj,
663                               struct bin_attribute *bin_attr,
664                               char *buf, loff_t off, size_t count)
665 {
666         struct device *dev = to_dev(kobj);
667         struct net_bridge *br = to_bridge(dev);
668         int n;
669
670         /* must read whole records */
671         if (off % sizeof(struct __fdb_entry) != 0)
672                 return -EINVAL;
673
674         n =  br_fdb_fillbuf(br, buf,
675                             count / sizeof(struct __fdb_entry),
676                             off / sizeof(struct __fdb_entry));
677
678         if (n > 0)
679                 n *= sizeof(struct __fdb_entry);
680
681         return n;
682 }
683
684 static struct bin_attribute bridge_forward = {
685         .attr = { .name = SYSFS_BRIDGE_FDB,
686                   .mode = S_IRUGO, },
687         .read = brforward_read,
688 };
689
690 /*
691  * Add entries in sysfs onto the existing network class device
692  * for the bridge.
693  *   Adds a attribute group "bridge" containing tuning parameters.
694  *   Binary attribute containing the forward table
695  *   Sub directory to hold links to interfaces.
696  *
697  * Note: the ifobj exists only to be a subdirectory
698  *   to hold links.  The ifobj exists in same data structure
699  *   as it's parent the bridge so reference counting works.
700  */
701 int br_sysfs_addbr(struct net_device *dev)
702 {
703         struct kobject *brobj = &dev->dev.kobj;
704         struct net_bridge *br = netdev_priv(dev);
705         int err;
706
707         err = sysfs_create_group(brobj, &bridge_group);
708         if (err) {
709                 pr_info("%s: can't create group %s/%s\n",
710                         __func__, dev->name, bridge_group.name);
711                 goto out1;
712         }
713
714         err = sysfs_create_bin_file(brobj, &bridge_forward);
715         if (err) {
716                 pr_info("%s: can't create attribute file %s/%s\n",
717                         __func__, dev->name, bridge_forward.attr.name);
718                 goto out2;
719         }
720
721         br->ifobj = kobject_create_and_add(SYSFS_BRIDGE_PORT_SUBDIR, brobj);
722         if (!br->ifobj) {
723                 pr_info("%s: can't add kobject (directory) %s/%s\n",
724                         __func__, dev->name, SYSFS_BRIDGE_PORT_SUBDIR);
725                 goto out3;
726         }
727         return 0;
728  out3:
729         sysfs_remove_bin_file(&dev->dev.kobj, &bridge_forward);
730  out2:
731         sysfs_remove_group(&dev->dev.kobj, &bridge_group);
732  out1:
733         return err;
734
735 }
736
737 void br_sysfs_delbr(struct net_device *dev)
738 {
739         struct kobject *kobj = &dev->dev.kobj;
740         struct net_bridge *br = netdev_priv(dev);
741
742         kobject_put(br->ifobj);
743         sysfs_remove_bin_file(kobj, &bridge_forward);
744         sysfs_remove_group(kobj, &bridge_group);
745 }