xref: /openbmc/linux/net/bridge/br_sysfs_if.c (revision 22246614)
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 
23 struct 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)		        \
30 struct brport_attribute brport_attr_##_name = { 	        \
31 	.attr = {.name = __stringify(_name), 			\
32 		 .mode = _mode },				\
33 	.show	= _show,					\
34 	.store	= _store,					\
35 };
36 
37 static ssize_t show_path_cost(struct net_bridge_port *p, char *buf)
38 {
39 	return sprintf(buf, "%d\n", p->path_cost);
40 }
41 static 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 }
46 static BRPORT_ATTR(path_cost, S_IRUGO | S_IWUSR,
47 		   show_path_cost, store_path_cost);
48 
49 static ssize_t show_priority(struct net_bridge_port *p, char *buf)
50 {
51 	return sprintf(buf, "%d\n", p->priority);
52 }
53 static 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 }
60 static BRPORT_ATTR(priority, S_IRUGO | S_IWUSR,
61 			 show_priority, store_priority);
62 
63 static ssize_t show_designated_root(struct net_bridge_port *p, char *buf)
64 {
65 	return br_show_bridge_id(buf, &p->designated_root);
66 }
67 static BRPORT_ATTR(designated_root, S_IRUGO, show_designated_root, NULL);
68 
69 static ssize_t show_designated_bridge(struct net_bridge_port *p, char *buf)
70 {
71 	return br_show_bridge_id(buf, &p->designated_bridge);
72 }
73 static BRPORT_ATTR(designated_bridge, S_IRUGO, show_designated_bridge, NULL);
74 
75 static ssize_t show_designated_port(struct net_bridge_port *p, char *buf)
76 {
77 	return sprintf(buf, "%d\n", p->designated_port);
78 }
79 static BRPORT_ATTR(designated_port, S_IRUGO, show_designated_port, NULL);
80 
81 static ssize_t show_designated_cost(struct net_bridge_port *p, char *buf)
82 {
83 	return sprintf(buf, "%d\n", p->designated_cost);
84 }
85 static BRPORT_ATTR(designated_cost, S_IRUGO, show_designated_cost, NULL);
86 
87 static ssize_t show_port_id(struct net_bridge_port *p, char *buf)
88 {
89 	return sprintf(buf, "0x%x\n", p->port_id);
90 }
91 static BRPORT_ATTR(port_id, S_IRUGO, show_port_id, NULL);
92 
93 static 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 
98 static BRPORT_ATTR(port_no, S_IRUGO, show_port_no, NULL);
99 
100 static ssize_t show_change_ack(struct net_bridge_port *p, char *buf)
101 {
102 	return sprintf(buf, "%d\n", p->topology_change_ack);
103 }
104 static BRPORT_ATTR(change_ack, S_IRUGO, show_change_ack, NULL);
105 
106 static ssize_t show_config_pending(struct net_bridge_port *p, char *buf)
107 {
108 	return sprintf(buf, "%d\n", p->config_pending);
109 }
110 static BRPORT_ATTR(config_pending, S_IRUGO, show_config_pending, NULL);
111 
112 static ssize_t show_port_state(struct net_bridge_port *p, char *buf)
113 {
114 	return sprintf(buf, "%d\n", p->state);
115 }
116 static BRPORT_ATTR(state, S_IRUGO, show_port_state, NULL);
117 
118 static 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 }
123 static BRPORT_ATTR(message_age_timer, S_IRUGO, show_message_age_timer, NULL);
124 
125 static 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 }
130 static BRPORT_ATTR(forward_delay_timer, S_IRUGO, show_forward_delay_timer, NULL);
131 
132 static 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 }
137 static BRPORT_ATTR(hold_timer, S_IRUGO, show_hold_timer, NULL);
138 
139 static 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 }
144 static BRPORT_ATTR(flush, S_IWUSR, NULL, store_flush);
145 
146 static struct brport_attribute *brport_attrs[] = {
147 	&brport_attr_path_cost,
148 	&brport_attr_priority,
149 	&brport_attr_port_id,
150 	&brport_attr_port_no,
151 	&brport_attr_designated_root,
152 	&brport_attr_designated_bridge,
153 	&brport_attr_designated_port,
154 	&brport_attr_designated_cost,
155 	&brport_attr_state,
156 	&brport_attr_change_ack,
157 	&brport_attr_config_pending,
158 	&brport_attr_message_age_timer,
159 	&brport_attr_forward_delay_timer,
160 	&brport_attr_hold_timer,
161 	&brport_attr_flush,
162 	NULL
163 };
164 
165 #define to_brport_attr(_at) container_of(_at, struct brport_attribute, attr)
166 #define to_brport(obj)	container_of(obj, struct net_bridge_port, kobj)
167 
168 static ssize_t brport_show(struct kobject * kobj,
169 			   struct attribute * attr, char * buf)
170 {
171 	struct brport_attribute * brport_attr = to_brport_attr(attr);
172 	struct net_bridge_port * p = to_brport(kobj);
173 
174 	return brport_attr->show(p, buf);
175 }
176 
177 static ssize_t brport_store(struct kobject * kobj,
178 			    struct attribute * attr,
179 			    const char * buf, size_t count)
180 {
181 	struct brport_attribute * brport_attr = to_brport_attr(attr);
182 	struct net_bridge_port * p = to_brport(kobj);
183 	ssize_t ret = -EINVAL;
184 	char *endp;
185 	unsigned long val;
186 
187 	if (!capable(CAP_NET_ADMIN))
188 		return -EPERM;
189 
190 	val = simple_strtoul(buf, &endp, 0);
191 	if (endp != buf) {
192 		rtnl_lock();
193 		if (p->dev && p->br && brport_attr->store) {
194 			spin_lock_bh(&p->br->lock);
195 			ret = brport_attr->store(p, val);
196 			spin_unlock_bh(&p->br->lock);
197 			if (ret == 0)
198 				ret = count;
199 		}
200 		rtnl_unlock();
201 	}
202 	return ret;
203 }
204 
205 struct sysfs_ops brport_sysfs_ops = {
206 	.show = brport_show,
207 	.store = brport_store,
208 };
209 
210 /*
211  * Add sysfs entries to ethernet device added to a bridge.
212  * Creates a brport subdirectory with bridge attributes.
213  * Puts symlink in bridge's brport subdirectory
214  */
215 int br_sysfs_addif(struct net_bridge_port *p)
216 {
217 	struct net_bridge *br = p->br;
218 	struct brport_attribute **a;
219 	int err;
220 
221 	err = sysfs_create_link(&p->kobj, &br->dev->dev.kobj,
222 				SYSFS_BRIDGE_PORT_LINK);
223 	if (err)
224 		goto out2;
225 
226 	for (a = brport_attrs; *a; ++a) {
227 		err = sysfs_create_file(&p->kobj, &((*a)->attr));
228 		if (err)
229 			goto out2;
230 	}
231 
232 	err = sysfs_create_link(br->ifobj, &p->kobj, p->dev->name);
233 out2:
234 	return err;
235 }
236