2 * Sysfs attributes of bridge
3 * Linux ethernet bridge
6 * Stephen Hemminger <shemminger@osdl.org>
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.
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>
23 #include "br_private.h"
25 #define to_bridge(cd) ((struct net_bridge *)netdev_priv(to_net_dev(cd)))
28 * Common code for storing bridge parameters.
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))
34 struct net_bridge *br = to_bridge(d);
39 if (!ns_capable(dev_net(br->dev)->user_ns, CAP_NET_ADMIN))
42 val = simple_strtoul(buf, &endp, 0);
47 return restart_syscall();
49 err = (*set)(br, val);
51 netdev_state_change(br->dev);
54 return err ? err : len;
58 static ssize_t forward_delay_show(struct device *d,
59 struct device_attribute *attr, char *buf)
61 struct net_bridge *br = to_bridge(d);
62 return sprintf(buf, "%lu\n", jiffies_to_clock_t(br->forward_delay));
65 static ssize_t forward_delay_store(struct device *d,
66 struct device_attribute *attr,
67 const char *buf, size_t len)
69 return store_bridge_parm(d, buf, len, br_set_forward_delay);
71 static DEVICE_ATTR_RW(forward_delay);
73 static ssize_t hello_time_show(struct device *d, struct device_attribute *attr,
76 return sprintf(buf, "%lu\n",
77 jiffies_to_clock_t(to_bridge(d)->hello_time));
80 static ssize_t hello_time_store(struct device *d,
81 struct device_attribute *attr, const char *buf,
84 return store_bridge_parm(d, buf, len, br_set_hello_time);
86 static DEVICE_ATTR_RW(hello_time);
88 static ssize_t max_age_show(struct device *d, struct device_attribute *attr,
91 return sprintf(buf, "%lu\n",
92 jiffies_to_clock_t(to_bridge(d)->max_age));
95 static ssize_t max_age_store(struct device *d, struct device_attribute *attr,
96 const char *buf, size_t len)
98 return store_bridge_parm(d, buf, len, br_set_max_age);
100 static DEVICE_ATTR_RW(max_age);
102 static ssize_t ageing_time_show(struct device *d,
103 struct device_attribute *attr, char *buf)
105 struct net_bridge *br = to_bridge(d);
106 return sprintf(buf, "%lu\n", jiffies_to_clock_t(br->ageing_time));
109 static int set_ageing_time(struct net_bridge *br, unsigned long val)
111 return br_set_ageing_time(br, val);
114 static ssize_t ageing_time_store(struct device *d,
115 struct device_attribute *attr,
116 const char *buf, size_t len)
118 return store_bridge_parm(d, buf, len, set_ageing_time);
120 static DEVICE_ATTR_RW(ageing_time);
122 static ssize_t stp_state_show(struct device *d,
123 struct device_attribute *attr, char *buf)
125 struct net_bridge *br = to_bridge(d);
126 return sprintf(buf, "%d\n", br->stp_enabled);
130 static int set_stp_state(struct net_bridge *br, unsigned long val)
132 br_stp_set_enabled(br, val);
137 static ssize_t stp_state_store(struct device *d,
138 struct device_attribute *attr, const char *buf,
141 return store_bridge_parm(d, buf, len, set_stp_state);
143 static DEVICE_ATTR_RW(stp_state);
145 static ssize_t group_fwd_mask_show(struct device *d,
146 struct device_attribute *attr,
149 struct net_bridge *br = to_bridge(d);
150 return sprintf(buf, "%#x\n", br->group_fwd_mask);
153 static int set_group_fwd_mask(struct net_bridge *br, unsigned long val)
155 if (val & BR_GROUPFWD_RESTRICTED)
158 br->group_fwd_mask = val;
163 static ssize_t group_fwd_mask_store(struct device *d,
164 struct device_attribute *attr,
168 return store_bridge_parm(d, buf, len, set_group_fwd_mask);
170 static DEVICE_ATTR_RW(group_fwd_mask);
172 static ssize_t priority_show(struct device *d, struct device_attribute *attr,
175 struct net_bridge *br = to_bridge(d);
176 return sprintf(buf, "%d\n",
177 (br->bridge_id.prio[0] << 8) | br->bridge_id.prio[1]);
180 static int set_priority(struct net_bridge *br, unsigned long val)
182 br_stp_set_bridge_priority(br, (u16) val);
186 static ssize_t priority_store(struct device *d, struct device_attribute *attr,
187 const char *buf, size_t len)
189 return store_bridge_parm(d, buf, len, set_priority);
191 static DEVICE_ATTR_RW(priority);
193 static ssize_t root_id_show(struct device *d, struct device_attribute *attr,
196 return br_show_bridge_id(buf, &to_bridge(d)->designated_root);
198 static DEVICE_ATTR_RO(root_id);
200 static ssize_t bridge_id_show(struct device *d, struct device_attribute *attr,
203 return br_show_bridge_id(buf, &to_bridge(d)->bridge_id);
205 static DEVICE_ATTR_RO(bridge_id);
207 static ssize_t root_port_show(struct device *d, struct device_attribute *attr,
210 return sprintf(buf, "%d\n", to_bridge(d)->root_port);
212 static DEVICE_ATTR_RO(root_port);
214 static ssize_t root_path_cost_show(struct device *d,
215 struct device_attribute *attr, char *buf)
217 return sprintf(buf, "%d\n", to_bridge(d)->root_path_cost);
219 static DEVICE_ATTR_RO(root_path_cost);
221 static ssize_t topology_change_show(struct device *d,
222 struct device_attribute *attr, char *buf)
224 return sprintf(buf, "%d\n", to_bridge(d)->topology_change);
226 static DEVICE_ATTR_RO(topology_change);
228 static ssize_t topology_change_detected_show(struct device *d,
229 struct device_attribute *attr,
232 struct net_bridge *br = to_bridge(d);
233 return sprintf(buf, "%d\n", br->topology_change_detected);
235 static DEVICE_ATTR_RO(topology_change_detected);
237 static ssize_t hello_timer_show(struct device *d,
238 struct device_attribute *attr, char *buf)
240 struct net_bridge *br = to_bridge(d);
241 return sprintf(buf, "%ld\n", br_timer_value(&br->hello_timer));
243 static DEVICE_ATTR_RO(hello_timer);
245 static ssize_t tcn_timer_show(struct device *d, struct device_attribute *attr,
248 struct net_bridge *br = to_bridge(d);
249 return sprintf(buf, "%ld\n", br_timer_value(&br->tcn_timer));
251 static DEVICE_ATTR_RO(tcn_timer);
253 static ssize_t topology_change_timer_show(struct device *d,
254 struct device_attribute *attr,
257 struct net_bridge *br = to_bridge(d);
258 return sprintf(buf, "%ld\n", br_timer_value(&br->topology_change_timer));
260 static DEVICE_ATTR_RO(topology_change_timer);
262 static ssize_t gc_timer_show(struct device *d, struct device_attribute *attr,
265 struct net_bridge *br = to_bridge(d);
266 return sprintf(buf, "%ld\n", br_timer_value(&br->gc_timer));
268 static DEVICE_ATTR_RO(gc_timer);
270 static ssize_t group_addr_show(struct device *d,
271 struct device_attribute *attr, char *buf)
273 struct net_bridge *br = to_bridge(d);
274 return sprintf(buf, "%x:%x:%x:%x:%x:%x\n",
275 br->group_addr[0], br->group_addr[1],
276 br->group_addr[2], br->group_addr[3],
277 br->group_addr[4], br->group_addr[5]);
280 static ssize_t group_addr_store(struct device *d,
281 struct device_attribute *attr,
282 const char *buf, size_t len)
284 struct net_bridge *br = to_bridge(d);
288 if (!ns_capable(dev_net(br->dev)->user_ns, CAP_NET_ADMIN))
291 if (sscanf(buf, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
292 &new_addr[0], &new_addr[1], &new_addr[2],
293 &new_addr[3], &new_addr[4], &new_addr[5]) != 6)
296 if (!is_link_local_ether_addr(new_addr))
299 if (new_addr[5] == 1 || /* 802.3x Pause address */
300 new_addr[5] == 2 || /* 802.3ad Slow protocols */
301 new_addr[5] == 3) /* 802.1X PAE address */
305 return restart_syscall();
307 spin_lock_bh(&br->lock);
308 for (i = 0; i < 6; i++)
309 br->group_addr[i] = new_addr[i];
310 spin_unlock_bh(&br->lock);
312 br->group_addr_set = true;
313 br_recalculate_fwd_mask(br);
314 netdev_state_change(br->dev);
321 static DEVICE_ATTR_RW(group_addr);
323 static int set_flush(struct net_bridge *br, unsigned long val)
329 static ssize_t flush_store(struct device *d,
330 struct device_attribute *attr,
331 const char *buf, size_t len)
333 return store_bridge_parm(d, buf, len, set_flush);
335 static DEVICE_ATTR_WO(flush);
337 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
338 static ssize_t multicast_router_show(struct device *d,
339 struct device_attribute *attr, char *buf)
341 struct net_bridge *br = to_bridge(d);
342 return sprintf(buf, "%d\n", br->multicast_router);
345 static ssize_t multicast_router_store(struct device *d,
346 struct device_attribute *attr,
347 const char *buf, size_t len)
349 return store_bridge_parm(d, buf, len, br_multicast_set_router);
351 static DEVICE_ATTR_RW(multicast_router);
353 static ssize_t multicast_snooping_show(struct device *d,
354 struct device_attribute *attr,
357 struct net_bridge *br = to_bridge(d);
358 return sprintf(buf, "%d\n", !br->multicast_disabled);
361 static ssize_t multicast_snooping_store(struct device *d,
362 struct device_attribute *attr,
363 const char *buf, size_t len)
365 return store_bridge_parm(d, buf, len, br_multicast_toggle);
367 static DEVICE_ATTR_RW(multicast_snooping);
369 static ssize_t multicast_query_use_ifaddr_show(struct device *d,
370 struct device_attribute *attr,
373 struct net_bridge *br = to_bridge(d);
374 return sprintf(buf, "%d\n", br->multicast_query_use_ifaddr);
377 static int set_query_use_ifaddr(struct net_bridge *br, unsigned long val)
379 br->multicast_query_use_ifaddr = !!val;
384 multicast_query_use_ifaddr_store(struct device *d,
385 struct device_attribute *attr,
386 const char *buf, size_t len)
388 return store_bridge_parm(d, buf, len, set_query_use_ifaddr);
390 static DEVICE_ATTR_RW(multicast_query_use_ifaddr);
392 static ssize_t multicast_querier_show(struct device *d,
393 struct device_attribute *attr,
396 struct net_bridge *br = to_bridge(d);
397 return sprintf(buf, "%d\n", br->multicast_querier);
400 static ssize_t multicast_querier_store(struct device *d,
401 struct device_attribute *attr,
402 const char *buf, size_t len)
404 return store_bridge_parm(d, buf, len, br_multicast_set_querier);
406 static DEVICE_ATTR_RW(multicast_querier);
408 static ssize_t hash_elasticity_show(struct device *d,
409 struct device_attribute *attr, char *buf)
411 struct net_bridge *br = to_bridge(d);
412 return sprintf(buf, "%u\n", br->hash_elasticity);
415 static int set_elasticity(struct net_bridge *br, unsigned long val)
417 br->hash_elasticity = val;
421 static ssize_t hash_elasticity_store(struct device *d,
422 struct device_attribute *attr,
423 const char *buf, size_t len)
425 return store_bridge_parm(d, buf, len, set_elasticity);
427 static DEVICE_ATTR_RW(hash_elasticity);
429 static ssize_t hash_max_show(struct device *d, struct device_attribute *attr,
432 struct net_bridge *br = to_bridge(d);
433 return sprintf(buf, "%u\n", br->hash_max);
436 static ssize_t hash_max_store(struct device *d, struct device_attribute *attr,
437 const char *buf, size_t len)
439 return store_bridge_parm(d, buf, len, br_multicast_set_hash_max);
441 static DEVICE_ATTR_RW(hash_max);
443 static ssize_t multicast_last_member_count_show(struct device *d,
444 struct device_attribute *attr,
447 struct net_bridge *br = to_bridge(d);
448 return sprintf(buf, "%u\n", br->multicast_last_member_count);
451 static int set_last_member_count(struct net_bridge *br, unsigned long val)
453 br->multicast_last_member_count = val;
457 static ssize_t multicast_last_member_count_store(struct device *d,
458 struct device_attribute *attr,
459 const char *buf, size_t len)
461 return store_bridge_parm(d, buf, len, set_last_member_count);
463 static DEVICE_ATTR_RW(multicast_last_member_count);
465 static ssize_t multicast_startup_query_count_show(
466 struct device *d, struct device_attribute *attr, char *buf)
468 struct net_bridge *br = to_bridge(d);
469 return sprintf(buf, "%u\n", br->multicast_startup_query_count);
472 static int set_startup_query_count(struct net_bridge *br, unsigned long val)
474 br->multicast_startup_query_count = val;
478 static ssize_t multicast_startup_query_count_store(
479 struct device *d, struct device_attribute *attr, const char *buf,
482 return store_bridge_parm(d, buf, len, set_startup_query_count);
484 static DEVICE_ATTR_RW(multicast_startup_query_count);
486 static ssize_t multicast_last_member_interval_show(
487 struct device *d, struct device_attribute *attr, char *buf)
489 struct net_bridge *br = to_bridge(d);
490 return sprintf(buf, "%lu\n",
491 jiffies_to_clock_t(br->multicast_last_member_interval));
494 static int set_last_member_interval(struct net_bridge *br, unsigned long val)
496 br->multicast_last_member_interval = clock_t_to_jiffies(val);
500 static ssize_t multicast_last_member_interval_store(
501 struct device *d, struct device_attribute *attr, const char *buf,
504 return store_bridge_parm(d, buf, len, set_last_member_interval);
506 static DEVICE_ATTR_RW(multicast_last_member_interval);
508 static ssize_t multicast_membership_interval_show(
509 struct device *d, struct device_attribute *attr, char *buf)
511 struct net_bridge *br = to_bridge(d);
512 return sprintf(buf, "%lu\n",
513 jiffies_to_clock_t(br->multicast_membership_interval));
516 static int set_membership_interval(struct net_bridge *br, unsigned long val)
518 br->multicast_membership_interval = clock_t_to_jiffies(val);
522 static ssize_t multicast_membership_interval_store(
523 struct device *d, struct device_attribute *attr, const char *buf,
526 return store_bridge_parm(d, buf, len, set_membership_interval);
528 static DEVICE_ATTR_RW(multicast_membership_interval);
530 static ssize_t multicast_querier_interval_show(struct device *d,
531 struct device_attribute *attr,
534 struct net_bridge *br = to_bridge(d);
535 return sprintf(buf, "%lu\n",
536 jiffies_to_clock_t(br->multicast_querier_interval));
539 static int set_querier_interval(struct net_bridge *br, unsigned long val)
541 br->multicast_querier_interval = clock_t_to_jiffies(val);
545 static ssize_t multicast_querier_interval_store(struct device *d,
546 struct device_attribute *attr,
547 const char *buf, size_t len)
549 return store_bridge_parm(d, buf, len, set_querier_interval);
551 static DEVICE_ATTR_RW(multicast_querier_interval);
553 static ssize_t multicast_query_interval_show(struct device *d,
554 struct device_attribute *attr,
557 struct net_bridge *br = to_bridge(d);
558 return sprintf(buf, "%lu\n",
559 jiffies_to_clock_t(br->multicast_query_interval));
562 static int set_query_interval(struct net_bridge *br, unsigned long val)
564 br->multicast_query_interval = clock_t_to_jiffies(val);
568 static ssize_t multicast_query_interval_store(struct device *d,
569 struct device_attribute *attr,
570 const char *buf, size_t len)
572 return store_bridge_parm(d, buf, len, set_query_interval);
574 static DEVICE_ATTR_RW(multicast_query_interval);
576 static ssize_t multicast_query_response_interval_show(
577 struct device *d, struct device_attribute *attr, char *buf)
579 struct net_bridge *br = to_bridge(d);
582 jiffies_to_clock_t(br->multicast_query_response_interval));
585 static int set_query_response_interval(struct net_bridge *br, unsigned long val)
587 br->multicast_query_response_interval = clock_t_to_jiffies(val);
591 static ssize_t multicast_query_response_interval_store(
592 struct device *d, struct device_attribute *attr, const char *buf,
595 return store_bridge_parm(d, buf, len, set_query_response_interval);
597 static DEVICE_ATTR_RW(multicast_query_response_interval);
599 static ssize_t multicast_startup_query_interval_show(
600 struct device *d, struct device_attribute *attr, char *buf)
602 struct net_bridge *br = to_bridge(d);
605 jiffies_to_clock_t(br->multicast_startup_query_interval));
608 static int set_startup_query_interval(struct net_bridge *br, unsigned long val)
610 br->multicast_startup_query_interval = clock_t_to_jiffies(val);
614 static ssize_t multicast_startup_query_interval_store(
615 struct device *d, struct device_attribute *attr, const char *buf,
618 return store_bridge_parm(d, buf, len, set_startup_query_interval);
620 static DEVICE_ATTR_RW(multicast_startup_query_interval);
622 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
623 static ssize_t nf_call_iptables_show(
624 struct device *d, struct device_attribute *attr, char *buf)
626 struct net_bridge *br = to_bridge(d);
627 return sprintf(buf, "%u\n", br->nf_call_iptables);
630 static int set_nf_call_iptables(struct net_bridge *br, unsigned long val)
632 br->nf_call_iptables = val ? true : false;
636 static ssize_t nf_call_iptables_store(
637 struct device *d, struct device_attribute *attr, const char *buf,
640 return store_bridge_parm(d, buf, len, set_nf_call_iptables);
642 static DEVICE_ATTR_RW(nf_call_iptables);
644 static ssize_t nf_call_ip6tables_show(
645 struct device *d, struct device_attribute *attr, char *buf)
647 struct net_bridge *br = to_bridge(d);
648 return sprintf(buf, "%u\n", br->nf_call_ip6tables);
651 static int set_nf_call_ip6tables(struct net_bridge *br, unsigned long val)
653 br->nf_call_ip6tables = val ? true : false;
657 static ssize_t nf_call_ip6tables_store(
658 struct device *d, struct device_attribute *attr, const char *buf,
661 return store_bridge_parm(d, buf, len, set_nf_call_ip6tables);
663 static DEVICE_ATTR_RW(nf_call_ip6tables);
665 static ssize_t nf_call_arptables_show(
666 struct device *d, struct device_attribute *attr, char *buf)
668 struct net_bridge *br = to_bridge(d);
669 return sprintf(buf, "%u\n", br->nf_call_arptables);
672 static int set_nf_call_arptables(struct net_bridge *br, unsigned long val)
674 br->nf_call_arptables = val ? true : false;
678 static ssize_t nf_call_arptables_store(
679 struct device *d, struct device_attribute *attr, const char *buf,
682 return store_bridge_parm(d, buf, len, set_nf_call_arptables);
684 static DEVICE_ATTR_RW(nf_call_arptables);
686 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
687 static ssize_t vlan_filtering_show(struct device *d,
688 struct device_attribute *attr,
691 struct net_bridge *br = to_bridge(d);
692 return sprintf(buf, "%d\n", br->vlan_enabled);
695 static ssize_t vlan_filtering_store(struct device *d,
696 struct device_attribute *attr,
697 const char *buf, size_t len)
699 return store_bridge_parm(d, buf, len, br_vlan_filter_toggle);
701 static DEVICE_ATTR_RW(vlan_filtering);
703 static ssize_t vlan_protocol_show(struct device *d,
704 struct device_attribute *attr,
707 struct net_bridge *br = to_bridge(d);
708 return sprintf(buf, "%#06x\n", ntohs(br->vlan_proto));
711 static ssize_t vlan_protocol_store(struct device *d,
712 struct device_attribute *attr,
713 const char *buf, size_t len)
715 return store_bridge_parm(d, buf, len, br_vlan_set_proto);
717 static DEVICE_ATTR_RW(vlan_protocol);
719 static ssize_t default_pvid_show(struct device *d,
720 struct device_attribute *attr,
723 struct net_bridge *br = to_bridge(d);
724 return sprintf(buf, "%d\n", br->default_pvid);
727 static ssize_t default_pvid_store(struct device *d,
728 struct device_attribute *attr,
729 const char *buf, size_t len)
731 return store_bridge_parm(d, buf, len, br_vlan_set_default_pvid);
733 static DEVICE_ATTR_RW(default_pvid);
736 static struct attribute *bridge_attrs[] = {
737 &dev_attr_forward_delay.attr,
738 &dev_attr_hello_time.attr,
739 &dev_attr_max_age.attr,
740 &dev_attr_ageing_time.attr,
741 &dev_attr_stp_state.attr,
742 &dev_attr_group_fwd_mask.attr,
743 &dev_attr_priority.attr,
744 &dev_attr_bridge_id.attr,
745 &dev_attr_root_id.attr,
746 &dev_attr_root_path_cost.attr,
747 &dev_attr_root_port.attr,
748 &dev_attr_topology_change.attr,
749 &dev_attr_topology_change_detected.attr,
750 &dev_attr_hello_timer.attr,
751 &dev_attr_tcn_timer.attr,
752 &dev_attr_topology_change_timer.attr,
753 &dev_attr_gc_timer.attr,
754 &dev_attr_group_addr.attr,
755 &dev_attr_flush.attr,
756 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
757 &dev_attr_multicast_router.attr,
758 &dev_attr_multicast_snooping.attr,
759 &dev_attr_multicast_querier.attr,
760 &dev_attr_multicast_query_use_ifaddr.attr,
761 &dev_attr_hash_elasticity.attr,
762 &dev_attr_hash_max.attr,
763 &dev_attr_multicast_last_member_count.attr,
764 &dev_attr_multicast_startup_query_count.attr,
765 &dev_attr_multicast_last_member_interval.attr,
766 &dev_attr_multicast_membership_interval.attr,
767 &dev_attr_multicast_querier_interval.attr,
768 &dev_attr_multicast_query_interval.attr,
769 &dev_attr_multicast_query_response_interval.attr,
770 &dev_attr_multicast_startup_query_interval.attr,
772 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
773 &dev_attr_nf_call_iptables.attr,
774 &dev_attr_nf_call_ip6tables.attr,
775 &dev_attr_nf_call_arptables.attr,
777 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
778 &dev_attr_vlan_filtering.attr,
779 &dev_attr_vlan_protocol.attr,
780 &dev_attr_default_pvid.attr,
785 static struct attribute_group bridge_group = {
786 .name = SYSFS_BRIDGE_ATTR,
787 .attrs = bridge_attrs,
791 * Export the forwarding information table as a binary file
792 * The records are struct __fdb_entry.
794 * Returns the number of bytes read.
796 static ssize_t brforward_read(struct file *filp, struct kobject *kobj,
797 struct bin_attribute *bin_attr,
798 char *buf, loff_t off, size_t count)
800 struct device *dev = kobj_to_dev(kobj);
801 struct net_bridge *br = to_bridge(dev);
804 /* must read whole records */
805 if (off % sizeof(struct __fdb_entry) != 0)
808 n = br_fdb_fillbuf(br, buf,
809 count / sizeof(struct __fdb_entry),
810 off / sizeof(struct __fdb_entry));
813 n *= sizeof(struct __fdb_entry);
818 static struct bin_attribute bridge_forward = {
819 .attr = { .name = SYSFS_BRIDGE_FDB,
821 .read = brforward_read,
825 * Add entries in sysfs onto the existing network class device
827 * Adds a attribute group "bridge" containing tuning parameters.
828 * Binary attribute containing the forward table
829 * Sub directory to hold links to interfaces.
831 * Note: the ifobj exists only to be a subdirectory
832 * to hold links. The ifobj exists in same data structure
833 * as it's parent the bridge so reference counting works.
835 int br_sysfs_addbr(struct net_device *dev)
837 struct kobject *brobj = &dev->dev.kobj;
838 struct net_bridge *br = netdev_priv(dev);
841 err = sysfs_create_group(brobj, &bridge_group);
843 pr_info("%s: can't create group %s/%s\n",
844 __func__, dev->name, bridge_group.name);
848 err = sysfs_create_bin_file(brobj, &bridge_forward);
850 pr_info("%s: can't create attribute file %s/%s\n",
851 __func__, dev->name, bridge_forward.attr.name);
855 br->ifobj = kobject_create_and_add(SYSFS_BRIDGE_PORT_SUBDIR, brobj);
857 pr_info("%s: can't add kobject (directory) %s/%s\n",
858 __func__, dev->name, SYSFS_BRIDGE_PORT_SUBDIR);
863 sysfs_remove_bin_file(&dev->dev.kobj, &bridge_forward);
865 sysfs_remove_group(&dev->dev.kobj, &bridge_group);
871 void br_sysfs_delbr(struct net_device *dev)
873 struct kobject *kobj = &dev->dev.kobj;
874 struct net_bridge *br = netdev_priv(dev);
876 kobject_put(br->ifobj);
877 sysfs_remove_bin_file(kobj, &bridge_forward);
878 sysfs_remove_group(kobj, &bridge_group);