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