2 * Sysfs attributes of bridge ports
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/if_bridge.h>
18 #include <linux/rtnetlink.h>
19 #include <linux/spinlock.h>
20 #include <linux/sched/signal.h>
22 #include "br_private.h"
24 struct brport_attribute
{
25 struct attribute attr
;
26 ssize_t (*show
)(struct net_bridge_port
*, char *);
27 int (*store
)(struct net_bridge_port
*, unsigned long);
30 #define BRPORT_ATTR(_name, _mode, _show, _store) \
31 const struct brport_attribute brport_attr_##_name = { \
32 .attr = {.name = __stringify(_name), \
38 #define BRPORT_ATTR_FLAG(_name, _mask) \
39 static ssize_t show_##_name(struct net_bridge_port *p, char *buf) \
41 return sprintf(buf, "%d\n", !!(p->flags & _mask)); \
43 static int store_##_name(struct net_bridge_port *p, unsigned long v) \
45 return store_flag(p, v, _mask); \
47 static BRPORT_ATTR(_name, 0644, \
48 show_##_name, store_##_name)
50 static int store_flag(struct net_bridge_port
*p
, unsigned long v
,
62 if (flags
!= p
->flags
) {
64 br_port_flags_change(p
, mask
);
69 static ssize_t
show_path_cost(struct net_bridge_port
*p
, char *buf
)
71 return sprintf(buf
, "%d\n", p
->path_cost
);
74 static BRPORT_ATTR(path_cost
, 0644,
75 show_path_cost
, br_stp_set_path_cost
);
77 static ssize_t
show_priority(struct net_bridge_port
*p
, char *buf
)
79 return sprintf(buf
, "%d\n", p
->priority
);
82 static BRPORT_ATTR(priority
, 0644,
83 show_priority
, br_stp_set_port_priority
);
85 static ssize_t
show_designated_root(struct net_bridge_port
*p
, char *buf
)
87 return br_show_bridge_id(buf
, &p
->designated_root
);
89 static BRPORT_ATTR(designated_root
, 0444, show_designated_root
, NULL
);
91 static ssize_t
show_designated_bridge(struct net_bridge_port
*p
, char *buf
)
93 return br_show_bridge_id(buf
, &p
->designated_bridge
);
95 static BRPORT_ATTR(designated_bridge
, 0444, show_designated_bridge
, NULL
);
97 static ssize_t
show_designated_port(struct net_bridge_port
*p
, char *buf
)
99 return sprintf(buf
, "%d\n", p
->designated_port
);
101 static BRPORT_ATTR(designated_port
, 0444, show_designated_port
, NULL
);
103 static ssize_t
show_designated_cost(struct net_bridge_port
*p
, char *buf
)
105 return sprintf(buf
, "%d\n", p
->designated_cost
);
107 static BRPORT_ATTR(designated_cost
, 0444, show_designated_cost
, NULL
);
109 static ssize_t
show_port_id(struct net_bridge_port
*p
, char *buf
)
111 return sprintf(buf
, "0x%x\n", p
->port_id
);
113 static BRPORT_ATTR(port_id
, 0444, show_port_id
, NULL
);
115 static ssize_t
show_port_no(struct net_bridge_port
*p
, char *buf
)
117 return sprintf(buf
, "0x%x\n", p
->port_no
);
120 static BRPORT_ATTR(port_no
, 0444, show_port_no
, NULL
);
122 static ssize_t
show_change_ack(struct net_bridge_port
*p
, char *buf
)
124 return sprintf(buf
, "%d\n", p
->topology_change_ack
);
126 static BRPORT_ATTR(change_ack
, 0444, show_change_ack
, NULL
);
128 static ssize_t
show_config_pending(struct net_bridge_port
*p
, char *buf
)
130 return sprintf(buf
, "%d\n", p
->config_pending
);
132 static BRPORT_ATTR(config_pending
, 0444, show_config_pending
, NULL
);
134 static ssize_t
show_port_state(struct net_bridge_port
*p
, char *buf
)
136 return sprintf(buf
, "%d\n", p
->state
);
138 static BRPORT_ATTR(state
, 0444, show_port_state
, NULL
);
140 static ssize_t
show_message_age_timer(struct net_bridge_port
*p
,
143 return sprintf(buf
, "%ld\n", br_timer_value(&p
->message_age_timer
));
145 static BRPORT_ATTR(message_age_timer
, 0444, show_message_age_timer
, NULL
);
147 static ssize_t
show_forward_delay_timer(struct net_bridge_port
*p
,
150 return sprintf(buf
, "%ld\n", br_timer_value(&p
->forward_delay_timer
));
152 static BRPORT_ATTR(forward_delay_timer
, 0444, show_forward_delay_timer
, NULL
);
154 static ssize_t
show_hold_timer(struct net_bridge_port
*p
,
157 return sprintf(buf
, "%ld\n", br_timer_value(&p
->hold_timer
));
159 static BRPORT_ATTR(hold_timer
, 0444, show_hold_timer
, NULL
);
161 static int store_flush(struct net_bridge_port
*p
, unsigned long v
)
163 br_fdb_delete_by_port(p
->br
, p
, 0, 0); // Don't delete local entry
166 static BRPORT_ATTR(flush
, 0200, NULL
, store_flush
);
168 static ssize_t
show_group_fwd_mask(struct net_bridge_port
*p
, char *buf
)
170 return sprintf(buf
, "%#x\n", p
->group_fwd_mask
);
173 static int store_group_fwd_mask(struct net_bridge_port
*p
,
176 if (v
& BR_GROUPFWD_MACPAUSE
)
178 p
->group_fwd_mask
= v
;
182 static BRPORT_ATTR(group_fwd_mask
, 0644, show_group_fwd_mask
,
183 store_group_fwd_mask
);
185 BRPORT_ATTR_FLAG(hairpin_mode
, BR_HAIRPIN_MODE
);
186 BRPORT_ATTR_FLAG(bpdu_guard
, BR_BPDU_GUARD
);
187 BRPORT_ATTR_FLAG(root_block
, BR_ROOT_BLOCK
);
188 BRPORT_ATTR_FLAG(learning
, BR_LEARNING
);
189 BRPORT_ATTR_FLAG(unicast_flood
, BR_FLOOD
);
190 BRPORT_ATTR_FLAG(proxyarp
, BR_PROXYARP
);
191 BRPORT_ATTR_FLAG(proxyarp_wifi
, BR_PROXYARP_WIFI
);
192 BRPORT_ATTR_FLAG(multicast_flood
, BR_MCAST_FLOOD
);
193 BRPORT_ATTR_FLAG(broadcast_flood
, BR_BCAST_FLOOD
);
194 BRPORT_ATTR_FLAG(neigh_suppress
, BR_NEIGH_SUPPRESS
);
195 BRPORT_ATTR_FLAG(isolated
, BR_ISOLATED
);
197 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
198 static ssize_t
show_multicast_router(struct net_bridge_port
*p
, char *buf
)
200 return sprintf(buf
, "%d\n", p
->multicast_router
);
203 static int store_multicast_router(struct net_bridge_port
*p
,
206 return br_multicast_set_port_router(p
, v
);
208 static BRPORT_ATTR(multicast_router
, 0644, show_multicast_router
,
209 store_multicast_router
);
211 BRPORT_ATTR_FLAG(multicast_fast_leave
, BR_MULTICAST_FAST_LEAVE
);
212 BRPORT_ATTR_FLAG(multicast_to_unicast
, BR_MULTICAST_TO_UNICAST
);
215 static const struct brport_attribute
*brport_attrs
[] = {
216 &brport_attr_path_cost
,
217 &brport_attr_priority
,
218 &brport_attr_port_id
,
219 &brport_attr_port_no
,
220 &brport_attr_designated_root
,
221 &brport_attr_designated_bridge
,
222 &brport_attr_designated_port
,
223 &brport_attr_designated_cost
,
225 &brport_attr_change_ack
,
226 &brport_attr_config_pending
,
227 &brport_attr_message_age_timer
,
228 &brport_attr_forward_delay_timer
,
229 &brport_attr_hold_timer
,
231 &brport_attr_hairpin_mode
,
232 &brport_attr_bpdu_guard
,
233 &brport_attr_root_block
,
234 &brport_attr_learning
,
235 &brport_attr_unicast_flood
,
236 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
237 &brport_attr_multicast_router
,
238 &brport_attr_multicast_fast_leave
,
239 &brport_attr_multicast_to_unicast
,
241 &brport_attr_proxyarp
,
242 &brport_attr_proxyarp_wifi
,
243 &brport_attr_multicast_flood
,
244 &brport_attr_broadcast_flood
,
245 &brport_attr_group_fwd_mask
,
246 &brport_attr_neigh_suppress
,
247 &brport_attr_isolated
,
251 #define to_brport_attr(_at) container_of(_at, struct brport_attribute, attr)
252 #define to_brport(obj) container_of(obj, struct net_bridge_port, kobj)
254 static ssize_t
brport_show(struct kobject
*kobj
,
255 struct attribute
*attr
, char *buf
)
257 struct brport_attribute
*brport_attr
= to_brport_attr(attr
);
258 struct net_bridge_port
*p
= to_brport(kobj
);
260 if (!brport_attr
->show
)
263 return brport_attr
->show(p
, buf
);
266 static ssize_t
brport_store(struct kobject
*kobj
,
267 struct attribute
*attr
,
268 const char *buf
, size_t count
)
270 struct brport_attribute
*brport_attr
= to_brport_attr(attr
);
271 struct net_bridge_port
*p
= to_brport(kobj
);
272 ssize_t ret
= -EINVAL
;
276 if (!ns_capable(dev_net(p
->dev
)->user_ns
, CAP_NET_ADMIN
))
279 val
= simple_strtoul(buf
, &endp
, 0);
282 return restart_syscall();
283 if (p
->dev
&& p
->br
&& brport_attr
->store
) {
284 spin_lock_bh(&p
->br
->lock
);
285 ret
= brport_attr
->store(p
, val
);
286 spin_unlock_bh(&p
->br
->lock
);
288 br_ifinfo_notify(RTM_NEWLINK
, NULL
, p
);
297 const struct sysfs_ops brport_sysfs_ops
= {
299 .store
= brport_store
,
303 * Add sysfs entries to ethernet device added to a bridge.
304 * Creates a brport subdirectory with bridge attributes.
305 * Puts symlink in bridge's brif subdirectory
307 int br_sysfs_addif(struct net_bridge_port
*p
)
309 struct net_bridge
*br
= p
->br
;
310 const struct brport_attribute
**a
;
313 err
= sysfs_create_link(&p
->kobj
, &br
->dev
->dev
.kobj
,
314 SYSFS_BRIDGE_PORT_LINK
);
318 for (a
= brport_attrs
; *a
; ++a
) {
319 err
= sysfs_create_file(&p
->kobj
, &((*a
)->attr
));
324 strlcpy(p
->sysfs_name
, p
->dev
->name
, IFNAMSIZ
);
325 return sysfs_create_link(br
->ifobj
, &p
->kobj
, p
->sysfs_name
);
328 /* Rename bridge's brif symlink */
329 int br_sysfs_renameif(struct net_bridge_port
*p
)
331 struct net_bridge
*br
= p
->br
;
334 /* If a rename fails, the rollback will cause another
335 * rename call with the existing name.
337 if (!strncmp(p
->sysfs_name
, p
->dev
->name
, IFNAMSIZ
))
340 err
= sysfs_rename_link(br
->ifobj
, &p
->kobj
,
341 p
->sysfs_name
, p
->dev
->name
);
343 netdev_notice(br
->dev
, "unable to rename link %s to %s",
344 p
->sysfs_name
, p
->dev
->name
);
346 strlcpy(p
->sysfs_name
, p
->dev
->name
, IFNAMSIZ
);