1/*
  2 *	Sysfs attributes of bridge
  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/etherdevice.h>
 18#include <linux/if_bridge.h>
 19#include <linux/rtnetlink.h>
 20#include <linux/spinlock.h>
 21#include <linux/times.h>
 22
 23#include "br_private.h"
 24
 25#define to_bridge(cd)	((struct net_bridge *)netdev_priv(to_net_dev(cd)))
 26
 27/*
 28 * Common code for storing bridge parameters.
 29 */
 30static 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 (!ns_capable(dev_net(br->dev)->user_ns, CAP_NET_ADMIN))
 40		return -EPERM;
 41
 42	val = simple_strtoul(buf, &endp, 0);
 43	if (endp == buf)
 44		return -EINVAL;
 45
 46	err = (*set)(br, val);
 47	return err ? err : len;
 48}
 49
 50
 51static ssize_t forward_delay_show(struct device *d,
 52				  struct device_attribute *attr, char *buf)
 53{
 54	struct net_bridge *br = to_bridge(d);
 55	return sprintf(buf, "%lu\n", jiffies_to_clock_t(br->forward_delay));
 56}
 57
 58static ssize_t forward_delay_store(struct device *d,
 59				   struct device_attribute *attr,
 60				   const char *buf, size_t len)
 61{
 62	return store_bridge_parm(d, buf, len, br_set_forward_delay);
 63}
 64static DEVICE_ATTR_RW(forward_delay);
 65
 66static ssize_t hello_time_show(struct device *d, struct device_attribute *attr,
 67			       char *buf)
 68{
 69	return sprintf(buf, "%lu\n",
 70		       jiffies_to_clock_t(to_bridge(d)->hello_time));
 71}
 72
 73static ssize_t hello_time_store(struct device *d,
 74				struct device_attribute *attr, const char *buf,
 75				size_t len)
 76{
 77	return store_bridge_parm(d, buf, len, br_set_hello_time);
 78}
 79static DEVICE_ATTR_RW(hello_time);
 80
 81static ssize_t max_age_show(struct device *d, struct device_attribute *attr,
 82			    char *buf)
 83{
 84	return sprintf(buf, "%lu\n",
 85		       jiffies_to_clock_t(to_bridge(d)->max_age));
 86}
 87
 88static ssize_t max_age_store(struct device *d, struct device_attribute *attr,
 89			     const char *buf, size_t len)
 90{
 91	return store_bridge_parm(d, buf, len, br_set_max_age);
 92}
 93static DEVICE_ATTR_RW(max_age);
 94
 95static ssize_t ageing_time_show(struct device *d,
 96				struct device_attribute *attr, char *buf)
 97{
 98	struct net_bridge *br = to_bridge(d);
 99	return sprintf(buf, "%lu\n", jiffies_to_clock_t(br->ageing_time));
100}
101
102static int set_ageing_time(struct net_bridge *br, unsigned long val)
103{
104	int ret;
105
106	if (!rtnl_trylock())
107		return restart_syscall();
108
109	ret = br_set_ageing_time(br, val);
110	rtnl_unlock();
111
112	return ret;
113}
114
115static ssize_t ageing_time_store(struct device *d,
116				 struct device_attribute *attr,
117				 const char *buf, size_t len)
118{
119	return store_bridge_parm(d, buf, len, set_ageing_time);
120}
121static DEVICE_ATTR_RW(ageing_time);
122
123static ssize_t stp_state_show(struct device *d,
124			      struct device_attribute *attr, char *buf)
125{
126	struct net_bridge *br = to_bridge(d);
127	return sprintf(buf, "%d\n", br->stp_enabled);
128}
129
130
131static ssize_t stp_state_store(struct device *d,
132			       struct device_attribute *attr, const char *buf,
133			       size_t len)
134{
135	struct net_bridge *br = to_bridge(d);
136	char *endp;
137	unsigned long val;
138
139	if (!ns_capable(dev_net(br->dev)->user_ns, CAP_NET_ADMIN))
140		return -EPERM;
141
142	val = simple_strtoul(buf, &endp, 0);
143	if (endp == buf)
144		return -EINVAL;
145
146	if (!rtnl_trylock())
147		return restart_syscall();
148	br_stp_set_enabled(br, val);
149	rtnl_unlock();
150
151	return len;
152}
153static DEVICE_ATTR_RW(stp_state);
154
155static ssize_t group_fwd_mask_show(struct device *d,
156				   struct device_attribute *attr,
157				   char *buf)
158{
159	struct net_bridge *br = to_bridge(d);
160	return sprintf(buf, "%#x\n", br->group_fwd_mask);
161}
162
163
164static ssize_t group_fwd_mask_store(struct device *d,
165				    struct device_attribute *attr,
166				    const char *buf,
167				    size_t len)
168{
169	struct net_bridge *br = to_bridge(d);
170	char *endp;
171	unsigned long val;
172
173	if (!ns_capable(dev_net(br->dev)->user_ns, CAP_NET_ADMIN))
174		return -EPERM;
175
176	val = simple_strtoul(buf, &endp, 0);
177	if (endp == buf)
178		return -EINVAL;
179
180	if (val & BR_GROUPFWD_RESTRICTED)
181		return -EINVAL;
182
183	br->group_fwd_mask = val;
184
185	return len;
186}
187static DEVICE_ATTR_RW(group_fwd_mask);
188
189static ssize_t priority_show(struct device *d, struct device_attribute *attr,
190			     char *buf)
191{
192	struct net_bridge *br = to_bridge(d);
193	return sprintf(buf, "%d\n",
194		       (br->bridge_id.prio[0] << 8) | br->bridge_id.prio[1]);
195}
196
197static int set_priority(struct net_bridge *br, unsigned long val)
198{
199	br_stp_set_bridge_priority(br, (u16) val);
200	return 0;
201}
202
203static ssize_t priority_store(struct device *d, struct device_attribute *attr,
204			      const char *buf, size_t len)
205{
206	return store_bridge_parm(d, buf, len, set_priority);
207}
208static DEVICE_ATTR_RW(priority);
209
210static ssize_t root_id_show(struct device *d, struct device_attribute *attr,
211			    char *buf)
212{
213	return br_show_bridge_id(buf, &to_bridge(d)->designated_root);
214}
215static DEVICE_ATTR_RO(root_id);
216
217static ssize_t bridge_id_show(struct device *d, struct device_attribute *attr,
218			      char *buf)
219{
220	return br_show_bridge_id(buf, &to_bridge(d)->bridge_id);
221}
222static DEVICE_ATTR_RO(bridge_id);
223
224static ssize_t root_port_show(struct device *d, struct device_attribute *attr,
225			      char *buf)
226{
227	return sprintf(buf, "%d\n", to_bridge(d)->root_port);
228}
229static DEVICE_ATTR_RO(root_port);
230
231static ssize_t root_path_cost_show(struct device *d,
232				   struct device_attribute *attr, char *buf)
233{
234	return sprintf(buf, "%d\n", to_bridge(d)->root_path_cost);
235}
236static DEVICE_ATTR_RO(root_path_cost);
237
238static ssize_t topology_change_show(struct device *d,
239				    struct device_attribute *attr, char *buf)
240{
241	return sprintf(buf, "%d\n", to_bridge(d)->topology_change);
242}
243static DEVICE_ATTR_RO(topology_change);
244
245static ssize_t topology_change_detected_show(struct device *d,
246					     struct device_attribute *attr,
247					     char *buf)
248{
249	struct net_bridge *br = to_bridge(d);
250	return sprintf(buf, "%d\n", br->topology_change_detected);
251}
252static DEVICE_ATTR_RO(topology_change_detected);
253
254static ssize_t hello_timer_show(struct device *d,
255				struct device_attribute *attr, char *buf)
256{
257	struct net_bridge *br = to_bridge(d);
258	return sprintf(buf, "%ld\n", br_timer_value(&br->hello_timer));
259}
260static DEVICE_ATTR_RO(hello_timer);
261
262static ssize_t tcn_timer_show(struct device *d, struct device_attribute *attr,
263			      char *buf)
264{
265	struct net_bridge *br = to_bridge(d);
266	return sprintf(buf, "%ld\n", br_timer_value(&br->tcn_timer));
267}
268static DEVICE_ATTR_RO(tcn_timer);
269
270static ssize_t topology_change_timer_show(struct device *d,
271					  struct device_attribute *attr,
272					  char *buf)
273{
274	struct net_bridge *br = to_bridge(d);
275	return sprintf(buf, "%ld\n", br_timer_value(&br->topology_change_timer));
276}
277static DEVICE_ATTR_RO(topology_change_timer);
278
279static ssize_t gc_timer_show(struct device *d, struct device_attribute *attr,
280			     char *buf)
281{
282	struct net_bridge *br = to_bridge(d);
283	return sprintf(buf, "%ld\n", br_timer_value(&br->gc_timer));
284}
285static DEVICE_ATTR_RO(gc_timer);
286
287static ssize_t group_addr_show(struct device *d,
288			       struct device_attribute *attr, char *buf)
289{
290	struct net_bridge *br = to_bridge(d);
291	return sprintf(buf, "%x:%x:%x:%x:%x:%x\n",
292		       br->group_addr[0], br->group_addr[1],
293		       br->group_addr[2], br->group_addr[3],
294		       br->group_addr[4], br->group_addr[5]);
295}
296
297static ssize_t group_addr_store(struct device *d,
298				struct device_attribute *attr,
299				const char *buf, size_t len)
300{
301	struct net_bridge *br = to_bridge(d);
302	u8 new_addr[6];
303	int i;
304
305	if (!ns_capable(dev_net(br->dev)->user_ns, CAP_NET_ADMIN))
306		return -EPERM;
307
308	if (sscanf(buf, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
309		   &new_addr[0], &new_addr[1], &new_addr[2],
310		   &new_addr[3], &new_addr[4], &new_addr[5]) != 6)
311		return -EINVAL;
312
313	if (!is_link_local_ether_addr(new_addr))
314		return -EINVAL;
315
316	if (new_addr[5] == 1 ||		/* 802.3x Pause address */
317	    new_addr[5] == 2 ||		/* 802.3ad Slow protocols */
318	    new_addr[5] == 3)		/* 802.1X PAE address */
319		return -EINVAL;
320
321	if (!rtnl_trylock())
322		return restart_syscall();
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
329	br->group_addr_set = true;
330	br_recalculate_fwd_mask(br);
331
332	rtnl_unlock();
333
334	return len;
335}
336
337static DEVICE_ATTR_RW(group_addr);
338
339static ssize_t flush_store(struct device *d,
340			   struct device_attribute *attr,
341			   const char *buf, size_t len)
342{
343	struct net_bridge *br = to_bridge(d);
344
345	if (!ns_capable(dev_net(br->dev)->user_ns, CAP_NET_ADMIN))
346		return -EPERM;
347
348	br_fdb_flush(br);
349	return len;
350}
351static DEVICE_ATTR_WO(flush);
352
353#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
354static ssize_t multicast_router_show(struct device *d,
355				     struct device_attribute *attr, char *buf)
356{
357	struct net_bridge *br = to_bridge(d);
358	return sprintf(buf, "%d\n", br->multicast_router);
359}
360
361static ssize_t multicast_router_store(struct device *d,
362				      struct device_attribute *attr,
363				      const char *buf, size_t len)
364{
365	return store_bridge_parm(d, buf, len, br_multicast_set_router);
366}
367static DEVICE_ATTR_RW(multicast_router);
368
369static ssize_t multicast_snooping_show(struct device *d,
370				       struct device_attribute *attr,
371				       char *buf)
372{
373	struct net_bridge *br = to_bridge(d);
374	return sprintf(buf, "%d\n", !br->multicast_disabled);
375}
376
377static ssize_t multicast_snooping_store(struct device *d,
378					struct device_attribute *attr,
379					const char *buf, size_t len)
380{
381	return store_bridge_parm(d, buf, len, br_multicast_toggle);
382}
383static DEVICE_ATTR_RW(multicast_snooping);
384
385static ssize_t multicast_query_use_ifaddr_show(struct device *d,
386					       struct device_attribute *attr,
387					       char *buf)
388{
389	struct net_bridge *br = to_bridge(d);
390	return sprintf(buf, "%d\n", br->multicast_query_use_ifaddr);
391}
392
393static int set_query_use_ifaddr(struct net_bridge *br, unsigned long val)
394{
395	br->multicast_query_use_ifaddr = !!val;
396	return 0;
397}
398
399static ssize_t
400multicast_query_use_ifaddr_store(struct device *d,
401				 struct device_attribute *attr,
402				 const char *buf, size_t len)
403{
404	return store_bridge_parm(d, buf, len, set_query_use_ifaddr);
405}
406static DEVICE_ATTR_RW(multicast_query_use_ifaddr);
407
408static ssize_t multicast_querier_show(struct device *d,
409				      struct device_attribute *attr,
410				      char *buf)
411{
412	struct net_bridge *br = to_bridge(d);
413	return sprintf(buf, "%d\n", br->multicast_querier);
414}
415
416static ssize_t multicast_querier_store(struct device *d,
417				       struct device_attribute *attr,
418				       const char *buf, size_t len)
419{
420	return store_bridge_parm(d, buf, len, br_multicast_set_querier);
421}
422static DEVICE_ATTR_RW(multicast_querier);
423
424static ssize_t hash_elasticity_show(struct device *d,
425				    struct device_attribute *attr, char *buf)
426{
427	struct net_bridge *br = to_bridge(d);
428	return sprintf(buf, "%u\n", br->hash_elasticity);
429}
430
431static int set_elasticity(struct net_bridge *br, unsigned long val)
432{
433	br->hash_elasticity = val;
434	return 0;
435}
436
437static ssize_t hash_elasticity_store(struct device *d,
438				     struct device_attribute *attr,
439				     const char *buf, size_t len)
440{
441	return store_bridge_parm(d, buf, len, set_elasticity);
442}
443static DEVICE_ATTR_RW(hash_elasticity);
444
445static ssize_t hash_max_show(struct device *d, struct device_attribute *attr,
446			     char *buf)
447{
448	struct net_bridge *br = to_bridge(d);
449	return sprintf(buf, "%u\n", br->hash_max);
450}
451
452static ssize_t hash_max_store(struct device *d, struct device_attribute *attr,
453			      const char *buf, size_t len)
454{
455	return store_bridge_parm(d, buf, len, br_multicast_set_hash_max);
456}
457static DEVICE_ATTR_RW(hash_max);
458
459static ssize_t multicast_last_member_count_show(struct device *d,
460						struct device_attribute *attr,
461						char *buf)
462{
463	struct net_bridge *br = to_bridge(d);
464	return sprintf(buf, "%u\n", br->multicast_last_member_count);
465}
466
467static int set_last_member_count(struct net_bridge *br, unsigned long val)
468{
469	br->multicast_last_member_count = val;
470	return 0;
471}
472
473static ssize_t multicast_last_member_count_store(struct device *d,
474						 struct device_attribute *attr,
475						 const char *buf, size_t len)
476{
477	return store_bridge_parm(d, buf, len, set_last_member_count);
478}
479static DEVICE_ATTR_RW(multicast_last_member_count);
480
481static ssize_t multicast_startup_query_count_show(
482	struct device *d, struct device_attribute *attr, char *buf)
483{
484	struct net_bridge *br = to_bridge(d);
485	return sprintf(buf, "%u\n", br->multicast_startup_query_count);
486}
487
488static int set_startup_query_count(struct net_bridge *br, unsigned long val)
489{
490	br->multicast_startup_query_count = val;
491	return 0;
492}
493
494static ssize_t multicast_startup_query_count_store(
495	struct device *d, struct device_attribute *attr, const char *buf,
496	size_t len)
497{
498	return store_bridge_parm(d, buf, len, set_startup_query_count);
499}
500static DEVICE_ATTR_RW(multicast_startup_query_count);
501
502static ssize_t multicast_last_member_interval_show(
503	struct device *d, struct device_attribute *attr, char *buf)
504{
505	struct net_bridge *br = to_bridge(d);
506	return sprintf(buf, "%lu\n",
507		       jiffies_to_clock_t(br->multicast_last_member_interval));
508}
509
510static int set_last_member_interval(struct net_bridge *br, unsigned long val)
511{
512	br->multicast_last_member_interval = clock_t_to_jiffies(val);
513	return 0;
514}
515
516static ssize_t multicast_last_member_interval_store(
517	struct device *d, struct device_attribute *attr, const char *buf,
518	size_t len)
519{
520	return store_bridge_parm(d, buf, len, set_last_member_interval);
521}
522static DEVICE_ATTR_RW(multicast_last_member_interval);
523
524static ssize_t multicast_membership_interval_show(
525	struct device *d, struct device_attribute *attr, char *buf)
526{
527	struct net_bridge *br = to_bridge(d);
528	return sprintf(buf, "%lu\n",
529		       jiffies_to_clock_t(br->multicast_membership_interval));
530}
531
532static int set_membership_interval(struct net_bridge *br, unsigned long val)
533{
534	br->multicast_membership_interval = clock_t_to_jiffies(val);
535	return 0;
536}
537
538static ssize_t multicast_membership_interval_store(
539	struct device *d, struct device_attribute *attr, const char *buf,
540	size_t len)
541{
542	return store_bridge_parm(d, buf, len, set_membership_interval);
543}
544static DEVICE_ATTR_RW(multicast_membership_interval);
545
546static ssize_t multicast_querier_interval_show(struct device *d,
547					       struct device_attribute *attr,
548					       char *buf)
549{
550	struct net_bridge *br = to_bridge(d);
551	return sprintf(buf, "%lu\n",
552		       jiffies_to_clock_t(br->multicast_querier_interval));
553}
554
555static int set_querier_interval(struct net_bridge *br, unsigned long val)
556{
557	br->multicast_querier_interval = clock_t_to_jiffies(val);
558	return 0;
559}
560
561static ssize_t multicast_querier_interval_store(struct device *d,
562						struct device_attribute *attr,
563						const char *buf, size_t len)
564{
565	return store_bridge_parm(d, buf, len, set_querier_interval);
566}
567static DEVICE_ATTR_RW(multicast_querier_interval);
568
569static ssize_t multicast_query_interval_show(struct device *d,
570					     struct device_attribute *attr,
571					     char *buf)
572{
573	struct net_bridge *br = to_bridge(d);
574	return sprintf(buf, "%lu\n",
575		       jiffies_to_clock_t(br->multicast_query_interval));
576}
577
578static int set_query_interval(struct net_bridge *br, unsigned long val)
579{
580	br->multicast_query_interval = clock_t_to_jiffies(val);
581	return 0;
582}
583
584static ssize_t multicast_query_interval_store(struct device *d,
585					      struct device_attribute *attr,
586					      const char *buf, size_t len)
587{
588	return store_bridge_parm(d, buf, len, set_query_interval);
589}
590static DEVICE_ATTR_RW(multicast_query_interval);
591
592static ssize_t multicast_query_response_interval_show(
593	struct device *d, struct device_attribute *attr, char *buf)
594{
595	struct net_bridge *br = to_bridge(d);
596	return sprintf(
597		buf, "%lu\n",
598		jiffies_to_clock_t(br->multicast_query_response_interval));
599}
600
601static int set_query_response_interval(struct net_bridge *br, unsigned long val)
602{
603	br->multicast_query_response_interval = clock_t_to_jiffies(val);
604	return 0;
605}
606
607static ssize_t multicast_query_response_interval_store(
608	struct device *d, struct device_attribute *attr, const char *buf,
609	size_t len)
610{
611	return store_bridge_parm(d, buf, len, set_query_response_interval);
612}
613static DEVICE_ATTR_RW(multicast_query_response_interval);
614
615static ssize_t multicast_startup_query_interval_show(
616	struct device *d, struct device_attribute *attr, char *buf)
617{
618	struct net_bridge *br = to_bridge(d);
619	return sprintf(
620		buf, "%lu\n",
621		jiffies_to_clock_t(br->multicast_startup_query_interval));
622}
623
624static int set_startup_query_interval(struct net_bridge *br, unsigned long val)
625{
626	br->multicast_startup_query_interval = clock_t_to_jiffies(val);
627	return 0;
628}
629
630static ssize_t multicast_startup_query_interval_store(
631	struct device *d, struct device_attribute *attr, const char *buf,
632	size_t len)
633{
634	return store_bridge_parm(d, buf, len, set_startup_query_interval);
635}
636static DEVICE_ATTR_RW(multicast_startup_query_interval);
637#endif
638#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
639static ssize_t nf_call_iptables_show(
640	struct device *d, struct device_attribute *attr, char *buf)
641{
642	struct net_bridge *br = to_bridge(d);
643	return sprintf(buf, "%u\n", br->nf_call_iptables);
644}
645
646static int set_nf_call_iptables(struct net_bridge *br, unsigned long val)
647{
648	br->nf_call_iptables = val ? true : false;
649	return 0;
650}
651
652static ssize_t nf_call_iptables_store(
653	struct device *d, struct device_attribute *attr, const char *buf,
654	size_t len)
655{
656	return store_bridge_parm(d, buf, len, set_nf_call_iptables);
657}
658static DEVICE_ATTR_RW(nf_call_iptables);
659
660static ssize_t nf_call_ip6tables_show(
661	struct device *d, struct device_attribute *attr, char *buf)
662{
663	struct net_bridge *br = to_bridge(d);
664	return sprintf(buf, "%u\n", br->nf_call_ip6tables);
665}
666
667static int set_nf_call_ip6tables(struct net_bridge *br, unsigned long val)
668{
669	br->nf_call_ip6tables = val ? true : false;
670	return 0;
671}
672
673static ssize_t nf_call_ip6tables_store(
674	struct device *d, struct device_attribute *attr, const char *buf,
675	size_t len)
676{
677	return store_bridge_parm(d, buf, len, set_nf_call_ip6tables);
678}
679static DEVICE_ATTR_RW(nf_call_ip6tables);
680
681static ssize_t nf_call_arptables_show(
682	struct device *d, struct device_attribute *attr, char *buf)
683{
684	struct net_bridge *br = to_bridge(d);
685	return sprintf(buf, "%u\n", br->nf_call_arptables);
686}
687
688static int set_nf_call_arptables(struct net_bridge *br, unsigned long val)
689{
690	br->nf_call_arptables = val ? true : false;
691	return 0;
692}
693
694static ssize_t nf_call_arptables_store(
695	struct device *d, struct device_attribute *attr, const char *buf,
696	size_t len)
697{
698	return store_bridge_parm(d, buf, len, set_nf_call_arptables);
699}
700static DEVICE_ATTR_RW(nf_call_arptables);
701#endif
702#ifdef CONFIG_BRIDGE_VLAN_FILTERING
703static ssize_t vlan_filtering_show(struct device *d,
704				   struct device_attribute *attr,
705				   char *buf)
706{
707	struct net_bridge *br = to_bridge(d);
708	return sprintf(buf, "%d\n", br->vlan_enabled);
709}
710
711static ssize_t vlan_filtering_store(struct device *d,
712				    struct device_attribute *attr,
713				    const char *buf, size_t len)
714{
715	return store_bridge_parm(d, buf, len, br_vlan_filter_toggle);
716}
717static DEVICE_ATTR_RW(vlan_filtering);
718
719static ssize_t vlan_protocol_show(struct device *d,
720				  struct device_attribute *attr,
721				  char *buf)
722{
723	struct net_bridge *br = to_bridge(d);
724	return sprintf(buf, "%#06x\n", ntohs(br->vlan_proto));
725}
726
727static ssize_t vlan_protocol_store(struct device *d,
728				   struct device_attribute *attr,
729				   const char *buf, size_t len)
730{
731	return store_bridge_parm(d, buf, len, br_vlan_set_proto);
732}
733static DEVICE_ATTR_RW(vlan_protocol);
734
735static ssize_t default_pvid_show(struct device *d,
736				 struct device_attribute *attr,
737				 char *buf)
738{
739	struct net_bridge *br = to_bridge(d);
740	return sprintf(buf, "%d\n", br->default_pvid);
741}
742
743static ssize_t default_pvid_store(struct device *d,
744				  struct device_attribute *attr,
745				  const char *buf, size_t len)
746{
747	return store_bridge_parm(d, buf, len, br_vlan_set_default_pvid);
748}
749static DEVICE_ATTR_RW(default_pvid);
750#endif
751
752static struct attribute *bridge_attrs[] = {
753	&dev_attr_forward_delay.attr,
754	&dev_attr_hello_time.attr,
755	&dev_attr_max_age.attr,
756	&dev_attr_ageing_time.attr,
757	&dev_attr_stp_state.attr,
758	&dev_attr_group_fwd_mask.attr,
759	&dev_attr_priority.attr,
760	&dev_attr_bridge_id.attr,
761	&dev_attr_root_id.attr,
762	&dev_attr_root_path_cost.attr,
763	&dev_attr_root_port.attr,
764	&dev_attr_topology_change.attr,
765	&dev_attr_topology_change_detected.attr,
766	&dev_attr_hello_timer.attr,
767	&dev_attr_tcn_timer.attr,
768	&dev_attr_topology_change_timer.attr,
769	&dev_attr_gc_timer.attr,
770	&dev_attr_group_addr.attr,
771	&dev_attr_flush.attr,
772#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
773	&dev_attr_multicast_router.attr,
774	&dev_attr_multicast_snooping.attr,
775	&dev_attr_multicast_querier.attr,
776	&dev_attr_multicast_query_use_ifaddr.attr,
777	&dev_attr_hash_elasticity.attr,
778	&dev_attr_hash_max.attr,
779	&dev_attr_multicast_last_member_count.attr,
780	&dev_attr_multicast_startup_query_count.attr,
781	&dev_attr_multicast_last_member_interval.attr,
782	&dev_attr_multicast_membership_interval.attr,
783	&dev_attr_multicast_querier_interval.attr,
784	&dev_attr_multicast_query_interval.attr,
785	&dev_attr_multicast_query_response_interval.attr,
786	&dev_attr_multicast_startup_query_interval.attr,
787#endif
788#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
789	&dev_attr_nf_call_iptables.attr,
790	&dev_attr_nf_call_ip6tables.attr,
791	&dev_attr_nf_call_arptables.attr,
792#endif
793#ifdef CONFIG_BRIDGE_VLAN_FILTERING
794	&dev_attr_vlan_filtering.attr,
795	&dev_attr_vlan_protocol.attr,
796	&dev_attr_default_pvid.attr,
797#endif
798	NULL
799};
800
801static struct attribute_group bridge_group = {
802	.name = SYSFS_BRIDGE_ATTR,
803	.attrs = bridge_attrs,
804};
805
806/*
807 * Export the forwarding information table as a binary file
808 * The records are struct __fdb_entry.
809 *
810 * Returns the number of bytes read.
811 */
812static ssize_t brforward_read(struct file *filp, struct kobject *kobj,
813			      struct bin_attribute *bin_attr,
814			      char *buf, loff_t off, size_t count)
815{
816	struct device *dev = kobj_to_dev(kobj);
817	struct net_bridge *br = to_bridge(dev);
818	int n;
819
820	/* must read whole records */
821	if (off % sizeof(struct __fdb_entry) != 0)
822		return -EINVAL;
823
824	n =  br_fdb_fillbuf(br, buf,
825			    count / sizeof(struct __fdb_entry),
826			    off / sizeof(struct __fdb_entry));
827
828	if (n > 0)
829		n *= sizeof(struct __fdb_entry);
830
831	return n;
832}
833
834static struct bin_attribute bridge_forward = {
835	.attr = { .name = SYSFS_BRIDGE_FDB,
836		  .mode = S_IRUGO, },
837	.read = brforward_read,
838};
839
840/*
841 * Add entries in sysfs onto the existing network class device
842 * for the bridge.
843 *   Adds a attribute group "bridge" containing tuning parameters.
844 *   Binary attribute containing the forward table
845 *   Sub directory to hold links to interfaces.
846 *
847 * Note: the ifobj exists only to be a subdirectory
848 *   to hold links.  The ifobj exists in same data structure
849 *   as it's parent the bridge so reference counting works.
850 */
851int br_sysfs_addbr(struct net_device *dev)
852{
853	struct kobject *brobj = &dev->dev.kobj;
854	struct net_bridge *br = netdev_priv(dev);
855	int err;
856
857	err = sysfs_create_group(brobj, &bridge_group);
858	if (err) {
859		pr_info("%s: can't create group %s/%s\n",
860			__func__, dev->name, bridge_group.name);
861		goto out1;
862	}
863
864	err = sysfs_create_bin_file(brobj, &bridge_forward);
865	if (err) {
866		pr_info("%s: can't create attribute file %s/%s\n",
867			__func__, dev->name, bridge_forward.attr.name);
868		goto out2;
869	}
870
871	br->ifobj = kobject_create_and_add(SYSFS_BRIDGE_PORT_SUBDIR, brobj);
872	if (!br->ifobj) {
873		pr_info("%s: can't add kobject (directory) %s/%s\n",
874			__func__, dev->name, SYSFS_BRIDGE_PORT_SUBDIR);
875		goto out3;
876	}
877	return 0;
878 out3:
879	sysfs_remove_bin_file(&dev->dev.kobj, &bridge_forward);
880 out2:
881	sysfs_remove_group(&dev->dev.kobj, &bridge_group);
882 out1:
883	return err;
884
885}
886
887void br_sysfs_delbr(struct net_device *dev)
888{
889	struct kobject *kobj = &dev->dev.kobj;
890	struct net_bridge *br = netdev_priv(dev);
891
892	kobject_put(br->ifobj);
893	sysfs_remove_bin_file(kobj, &bridge_forward);
894	sysfs_remove_group(kobj, &bridge_group);
895}