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>
21 #include "br_private.h"
23 struct brport_attribute
{
24 struct attribute attr
;
25 ssize_t (*show
)(struct net_bridge_port
*, char *);
26 int (*store
)(struct net_bridge_port
*, unsigned long);
29 #define BRPORT_ATTR(_name, _mode, _show, _store) \
30 const struct brport_attribute brport_attr_##_name = { \
31 .attr = {.name = __stringify(_name), \
37 #define BRPORT_ATTR_FLAG(_name, _mask) \
38 static ssize_t show_##_name(struct net_bridge_port *p, char *buf) \
40 return sprintf(buf, "%d\n", !!(p->flags & _mask)); \
42 static int store_##_name(struct net_bridge_port *p, unsigned long v) \
44 return store_flag(p, v, _mask); \
46 static BRPORT_ATTR(_name, S_IRUGO | S_IWUSR, \
47 show_##_name, store_##_name)
49 static int store_flag(struct net_bridge_port
*p
, unsigned long v
,
52 unsigned long flags
= p
->flags
;
59 if (flags
!= p
->flags
) {
61 br_ifinfo_notify(RTM_NEWLINK
, p
);
66 static ssize_t
show_path_cost(struct net_bridge_port
*p
, char *buf
)
68 return sprintf(buf
, "%d\n", p
->path_cost
);
71 static BRPORT_ATTR(path_cost
, S_IRUGO
| S_IWUSR
,
72 show_path_cost
, br_stp_set_path_cost
);
74 static ssize_t
show_priority(struct net_bridge_port
*p
, char *buf
)
76 return sprintf(buf
, "%d\n", p
->priority
);
79 static BRPORT_ATTR(priority
, S_IRUGO
| S_IWUSR
,
80 show_priority
, br_stp_set_port_priority
);
82 static ssize_t
show_designated_root(struct net_bridge_port
*p
, char *buf
)
84 return br_show_bridge_id(buf
, &p
->designated_root
);
86 static BRPORT_ATTR(designated_root
, S_IRUGO
, show_designated_root
, NULL
);
88 static ssize_t
show_designated_bridge(struct net_bridge_port
*p
, char *buf
)
90 return br_show_bridge_id(buf
, &p
->designated_bridge
);
92 static BRPORT_ATTR(designated_bridge
, S_IRUGO
, show_designated_bridge
, NULL
);
94 static ssize_t
show_designated_port(struct net_bridge_port
*p
, char *buf
)
96 return sprintf(buf
, "%d\n", p
->designated_port
);
98 static BRPORT_ATTR(designated_port
, S_IRUGO
, show_designated_port
, NULL
);
100 static ssize_t
show_designated_cost(struct net_bridge_port
*p
, char *buf
)
102 return sprintf(buf
, "%d\n", p
->designated_cost
);
104 static BRPORT_ATTR(designated_cost
, S_IRUGO
, show_designated_cost
, NULL
);
106 static ssize_t
show_port_id(struct net_bridge_port
*p
, char *buf
)
108 return sprintf(buf
, "0x%x\n", p
->port_id
);
110 static BRPORT_ATTR(port_id
, S_IRUGO
, show_port_id
, NULL
);
112 static ssize_t
show_port_no(struct net_bridge_port
*p
, char *buf
)
114 return sprintf(buf
, "0x%x\n", p
->port_no
);
117 static BRPORT_ATTR(port_no
, S_IRUGO
, show_port_no
, NULL
);
119 static ssize_t
show_change_ack(struct net_bridge_port
*p
, char *buf
)
121 return sprintf(buf
, "%d\n", p
->topology_change_ack
);
123 static BRPORT_ATTR(change_ack
, S_IRUGO
, show_change_ack
, NULL
);
125 static ssize_t
show_config_pending(struct net_bridge_port
*p
, char *buf
)
127 return sprintf(buf
, "%d\n", p
->config_pending
);
129 static BRPORT_ATTR(config_pending
, S_IRUGO
, show_config_pending
, NULL
);
131 static ssize_t
show_port_state(struct net_bridge_port
*p
, char *buf
)
133 return sprintf(buf
, "%d\n", p
->state
);
135 static BRPORT_ATTR(state
, S_IRUGO
, show_port_state
, NULL
);
137 static ssize_t
show_message_age_timer(struct net_bridge_port
*p
,
140 return sprintf(buf
, "%ld\n", br_timer_value(&p
->message_age_timer
));
142 static BRPORT_ATTR(message_age_timer
, S_IRUGO
, show_message_age_timer
, NULL
);
144 static ssize_t
show_forward_delay_timer(struct net_bridge_port
*p
,
147 return sprintf(buf
, "%ld\n", br_timer_value(&p
->forward_delay_timer
));
149 static BRPORT_ATTR(forward_delay_timer
, S_IRUGO
, show_forward_delay_timer
, NULL
);
151 static ssize_t
show_hold_timer(struct net_bridge_port
*p
,
154 return sprintf(buf
, "%ld\n", br_timer_value(&p
->hold_timer
));
156 static BRPORT_ATTR(hold_timer
, S_IRUGO
, show_hold_timer
, NULL
);
158 static int store_flush(struct net_bridge_port
*p
, unsigned long v
)
160 br_fdb_delete_by_port(p
->br
, p
, 0); // Don't delete local entry
163 static BRPORT_ATTR(flush
, S_IWUSR
, NULL
, store_flush
);
165 BRPORT_ATTR_FLAG(hairpin_mode
, BR_HAIRPIN_MODE
);
166 BRPORT_ATTR_FLAG(bpdu_guard
, BR_BPDU_GUARD
);
167 BRPORT_ATTR_FLAG(root_block
, BR_ROOT_BLOCK
);
168 BRPORT_ATTR_FLAG(learning
, BR_LEARNING
);
169 BRPORT_ATTR_FLAG(unicast_flood
, BR_FLOOD
);
171 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
172 static ssize_t
show_multicast_router(struct net_bridge_port
*p
, char *buf
)
174 return sprintf(buf
, "%d\n", p
->multicast_router
);
177 static int store_multicast_router(struct net_bridge_port
*p
,
180 return br_multicast_set_port_router(p
, v
);
182 static BRPORT_ATTR(multicast_router
, S_IRUGO
| S_IWUSR
, show_multicast_router
,
183 store_multicast_router
);
185 BRPORT_ATTR_FLAG(multicast_fast_leave
, BR_MULTICAST_FAST_LEAVE
);
188 static const struct brport_attribute
*brport_attrs
[] = {
189 &brport_attr_path_cost
,
190 &brport_attr_priority
,
191 &brport_attr_port_id
,
192 &brport_attr_port_no
,
193 &brport_attr_designated_root
,
194 &brport_attr_designated_bridge
,
195 &brport_attr_designated_port
,
196 &brport_attr_designated_cost
,
198 &brport_attr_change_ack
,
199 &brport_attr_config_pending
,
200 &brport_attr_message_age_timer
,
201 &brport_attr_forward_delay_timer
,
202 &brport_attr_hold_timer
,
204 &brport_attr_hairpin_mode
,
205 &brport_attr_bpdu_guard
,
206 &brport_attr_root_block
,
207 &brport_attr_learning
,
208 &brport_attr_unicast_flood
,
209 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
210 &brport_attr_multicast_router
,
211 &brport_attr_multicast_fast_leave
,
216 #define to_brport_attr(_at) container_of(_at, struct brport_attribute, attr)
217 #define to_brport(obj) container_of(obj, struct net_bridge_port, kobj)
219 static ssize_t
brport_show(struct kobject
*kobj
,
220 struct attribute
*attr
, char *buf
)
222 struct brport_attribute
*brport_attr
= to_brport_attr(attr
);
223 struct net_bridge_port
*p
= to_brport(kobj
);
225 return brport_attr
->show(p
, buf
);
228 static ssize_t
brport_store(struct kobject
*kobj
,
229 struct attribute
*attr
,
230 const char *buf
, size_t count
)
232 struct brport_attribute
*brport_attr
= to_brport_attr(attr
);
233 struct net_bridge_port
*p
= to_brport(kobj
);
234 ssize_t ret
= -EINVAL
;
238 if (!ns_capable(dev_net(p
->dev
)->user_ns
, CAP_NET_ADMIN
))
241 val
= simple_strtoul(buf
, &endp
, 0);
244 return restart_syscall();
245 if (p
->dev
&& p
->br
&& brport_attr
->store
) {
246 spin_lock_bh(&p
->br
->lock
);
247 ret
= brport_attr
->store(p
, val
);
248 spin_unlock_bh(&p
->br
->lock
);
257 const struct sysfs_ops brport_sysfs_ops
= {
259 .store
= brport_store
,
263 * Add sysfs entries to ethernet device added to a bridge.
264 * Creates a brport subdirectory with bridge attributes.
265 * Puts symlink in bridge's brif subdirectory
267 int br_sysfs_addif(struct net_bridge_port
*p
)
269 struct net_bridge
*br
= p
->br
;
270 const struct brport_attribute
**a
;
273 err
= sysfs_create_link(&p
->kobj
, &br
->dev
->dev
.kobj
,
274 SYSFS_BRIDGE_PORT_LINK
);
278 for (a
= brport_attrs
; *a
; ++a
) {
279 err
= sysfs_create_file(&p
->kobj
, &((*a
)->attr
));
284 strlcpy(p
->sysfs_name
, p
->dev
->name
, IFNAMSIZ
);
285 return sysfs_create_link(br
->ifobj
, &p
->kobj
, p
->sysfs_name
);
288 /* Rename bridge's brif symlink */
289 int br_sysfs_renameif(struct net_bridge_port
*p
)
291 struct net_bridge
*br
= p
->br
;
294 /* If a rename fails, the rollback will cause another
295 * rename call with the existing name.
297 if (!strncmp(p
->sysfs_name
, p
->dev
->name
, IFNAMSIZ
))
300 err
= sysfs_rename_link(br
->ifobj
, &p
->kobj
,
301 p
->sysfs_name
, p
->dev
->name
);
303 netdev_notice(br
->dev
, "unable to rename link %s to %s",
304 p
->sysfs_name
, p
->dev
->name
);
306 strlcpy(p
->sysfs_name
, p
->dev
->name
, IFNAMSIZ
);