br_sysfs_if.c revision 0909e11758bd28848aeb6646e021ec1e031a3f0f 
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
21#include "br_private.h"
22
23struct brport_attribute {
24	struct attribute	attr;
25	ssize_t (*show)(struct net_bridge_port *, char *);
26	ssize_t (*store)(struct net_bridge_port *, unsigned long);
27};
28
29#define BRPORT_ATTR(_name,_mode,_show,_store)		        \
30struct brport_attribute brport_attr_##_name = { 	        \
31	.attr = {.name = __stringify(_name), 			\
32		 .mode = _mode },				\
33	.show	= _show,					\
34	.store	= _store,					\
35};
36
37static ssize_t show_path_cost(struct net_bridge_port *p, char *buf)
38{
39	return sprintf(buf, "%d\n", p->path_cost);
40}
41static ssize_t store_path_cost(struct net_bridge_port *p, unsigned long v)
42{
43	br_stp_set_path_cost(p, v);
44	return 0;
45}
46static BRPORT_ATTR(path_cost, S_IRUGO | S_IWUSR,
47		   show_path_cost, store_path_cost);
48
49static ssize_t show_priority(struct net_bridge_port *p, char *buf)
50{
51	return sprintf(buf, "%d\n", p->priority);
52}
53static ssize_t store_priority(struct net_bridge_port *p, unsigned long v)
54{
55	if (v >= (1<<(16-BR_PORT_BITS)))
56		return -ERANGE;
57	br_stp_set_port_priority(p, v);
58	return 0;
59}
60static BRPORT_ATTR(priority, S_IRUGO | S_IWUSR,
61			 show_priority, store_priority);
62
63static ssize_t show_designated_root(struct net_bridge_port *p, char *buf)
64{
65	return br_show_bridge_id(buf, &p->designated_root);
66}
67static BRPORT_ATTR(designated_root, S_IRUGO, show_designated_root, NULL);
68
69static ssize_t show_designated_bridge(struct net_bridge_port *p, char *buf)
70{
71	return br_show_bridge_id(buf, &p->designated_bridge);
72}
73static BRPORT_ATTR(designated_bridge, S_IRUGO, show_designated_bridge, NULL);
74
75static ssize_t show_designated_port(struct net_bridge_port *p, char *buf)
76{
77	return sprintf(buf, "%d\n", p->designated_port);
78}
79static BRPORT_ATTR(designated_port, S_IRUGO, show_designated_port, NULL);
80
81static ssize_t show_designated_cost(struct net_bridge_port *p, char *buf)
82{
83	return sprintf(buf, "%d\n", p->designated_cost);
84}
85static BRPORT_ATTR(designated_cost, S_IRUGO, show_designated_cost, NULL);
86
87static ssize_t show_port_id(struct net_bridge_port *p, char *buf)
88{
89	return sprintf(buf, "0x%x\n", p->port_id);
90}
91static BRPORT_ATTR(port_id, S_IRUGO, show_port_id, NULL);
92
93static ssize_t show_port_no(struct net_bridge_port *p, char *buf)
94{
95	return sprintf(buf, "0x%x\n", p->port_no);
96}
97
98static BRPORT_ATTR(port_no, S_IRUGO, show_port_no, NULL);
99
100static ssize_t show_change_ack(struct net_bridge_port *p, char *buf)
101{
102	return sprintf(buf, "%d\n", p->topology_change_ack);
103}
104static BRPORT_ATTR(change_ack, S_IRUGO, show_change_ack, NULL);
105
106static ssize_t show_config_pending(struct net_bridge_port *p, char *buf)
107{
108	return sprintf(buf, "%d\n", p->config_pending);
109}
110static BRPORT_ATTR(config_pending, S_IRUGO, show_config_pending, NULL);
111
112static ssize_t show_port_state(struct net_bridge_port *p, char *buf)
113{
114	return sprintf(buf, "%d\n", p->state);
115}
116static BRPORT_ATTR(state, S_IRUGO, show_port_state, NULL);
117
118static ssize_t show_message_age_timer(struct net_bridge_port *p,
119					    char *buf)
120{
121	return sprintf(buf, "%ld\n", br_timer_value(&p->message_age_timer));
122}
123static BRPORT_ATTR(message_age_timer, S_IRUGO, show_message_age_timer, NULL);
124
125static ssize_t show_forward_delay_timer(struct net_bridge_port *p,
126					    char *buf)
127{
128	return sprintf(buf, "%ld\n", br_timer_value(&p->forward_delay_timer));
129}
130static BRPORT_ATTR(forward_delay_timer, S_IRUGO, show_forward_delay_timer, NULL);
131
132static ssize_t show_hold_timer(struct net_bridge_port *p,
133					    char *buf)
134{
135	return sprintf(buf, "%ld\n", br_timer_value(&p->hold_timer));
136}
137static BRPORT_ATTR(hold_timer, S_IRUGO, show_hold_timer, NULL);
138
139static ssize_t store_flush(struct net_bridge_port *p, unsigned long v)
140{
141	br_fdb_delete_by_port(p->br, p, 0); // Don't delete local entry
142	return 0;
143}
144static BRPORT_ATTR(flush, S_IWUSR, NULL, store_flush);
145
146static ssize_t show_hairpin_mode(struct net_bridge_port *p, char *buf)
147{
148	int hairpin_mode = (p->flags & BR_HAIRPIN_MODE) ? 1 : 0;
149	return sprintf(buf, "%d\n", hairpin_mode);
150}
151static ssize_t store_hairpin_mode(struct net_bridge_port *p, unsigned long v)
152{
153	if (v)
154		p->flags |= BR_HAIRPIN_MODE;
155	else
156		p->flags &= ~BR_HAIRPIN_MODE;
157	return 0;
158}
159static BRPORT_ATTR(hairpin_mode, S_IRUGO | S_IWUSR,
160		   show_hairpin_mode, store_hairpin_mode);
161
162#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
163static ssize_t show_multicast_router(struct net_bridge_port *p, char *buf)
164{
165	return sprintf(buf, "%d\n", p->multicast_router);
166}
167
168static ssize_t store_multicast_router(struct net_bridge_port *p,
169				      unsigned long v)
170{
171	return br_multicast_set_port_router(p, v);
172}
173static BRPORT_ATTR(multicast_router, S_IRUGO | S_IWUSR, show_multicast_router,
174		   store_multicast_router);
175#endif
176
177static struct brport_attribute *brport_attrs[] = {
178	&brport_attr_path_cost,
179	&brport_attr_priority,
180	&brport_attr_port_id,
181	&brport_attr_port_no,
182	&brport_attr_designated_root,
183	&brport_attr_designated_bridge,
184	&brport_attr_designated_port,
185	&brport_attr_designated_cost,
186	&brport_attr_state,
187	&brport_attr_change_ack,
188	&brport_attr_config_pending,
189	&brport_attr_message_age_timer,
190	&brport_attr_forward_delay_timer,
191	&brport_attr_hold_timer,
192	&brport_attr_flush,
193	&brport_attr_hairpin_mode,
194#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
195	&brport_attr_multicast_router,
196#endif
197	NULL
198};
199
200#define to_brport_attr(_at) container_of(_at, struct brport_attribute, attr)
201#define to_brport(obj)	container_of(obj, struct net_bridge_port, kobj)
202
203static ssize_t brport_show(struct kobject * kobj,
204			   struct attribute * attr, char * buf)
205{
206	struct brport_attribute * brport_attr = to_brport_attr(attr);
207	struct net_bridge_port * p = to_brport(kobj);
208
209	return brport_attr->show(p, buf);
210}
211
212static ssize_t brport_store(struct kobject * kobj,
213			    struct attribute * attr,
214			    const char * buf, size_t count)
215{
216	struct brport_attribute * brport_attr = to_brport_attr(attr);
217	struct net_bridge_port * p = to_brport(kobj);
218	ssize_t ret = -EINVAL;
219	char *endp;
220	unsigned long val;
221
222	if (!capable(CAP_NET_ADMIN))
223		return -EPERM;
224
225	val = simple_strtoul(buf, &endp, 0);
226	if (endp != buf) {
227		if (!rtnl_trylock())
228			return restart_syscall();
229		if (p->dev && p->br && brport_attr->store) {
230			spin_lock_bh(&p->br->lock);
231			ret = brport_attr->store(p, val);
232			spin_unlock_bh(&p->br->lock);
233			if (ret == 0)
234				ret = count;
235		}
236		rtnl_unlock();
237	}
238	return ret;
239}
240
241struct sysfs_ops brport_sysfs_ops = {
242	.show = brport_show,
243	.store = brport_store,
244};
245
246/*
247 * Add sysfs entries to ethernet device added to a bridge.
248 * Creates a brport subdirectory with bridge attributes.
249 * Puts symlink in bridge's brport subdirectory
250 */
251int br_sysfs_addif(struct net_bridge_port *p)
252{
253	struct net_bridge *br = p->br;
254	struct brport_attribute **a;
255	int err;
256
257	err = sysfs_create_link(&p->kobj, &br->dev->dev.kobj,
258				SYSFS_BRIDGE_PORT_LINK);
259	if (err)
260		goto out2;
261
262	for (a = brport_attrs; *a; ++a) {
263		err = sysfs_create_file(&p->kobj, &((*a)->attr));
264		if (err)
265			goto out2;
266	}
267
268	err = sysfs_create_link(br->ifobj, &p->kobj, p->dev->name);
269out2:
270	return err;
271}
272