820643a3ba9c35e98d1b679e50bfbac22e987aa3
[linux-2.6.git] / net / bridge / br_sysfs_if.c
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 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 }
151 static 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 }
159 static BRPORT_ATTR(hairpin_mode, S_IRUGO | S_IWUSR,
160                    show_hairpin_mode, store_hairpin_mode);
161
162 static struct brport_attribute *brport_attrs[] = {
163         &brport_attr_path_cost,
164         &brport_attr_priority,
165         &brport_attr_port_id,
166         &brport_attr_port_no,
167         &brport_attr_designated_root,
168         &brport_attr_designated_bridge,
169         &brport_attr_designated_port,
170         &brport_attr_designated_cost,
171         &brport_attr_state,
172         &brport_attr_change_ack,
173         &brport_attr_config_pending,
174         &brport_attr_message_age_timer,
175         &brport_attr_forward_delay_timer,
176         &brport_attr_hold_timer,
177         &brport_attr_flush,
178         &brport_attr_hairpin_mode,
179         NULL
180 };
181
182 #define to_brport_attr(_at) container_of(_at, struct brport_attribute, attr)
183 #define to_brport(obj)  container_of(obj, struct net_bridge_port, kobj)
184
185 static ssize_t brport_show(struct kobject * kobj,
186                            struct attribute * attr, char * buf)
187 {
188         struct brport_attribute * brport_attr = to_brport_attr(attr);
189         struct net_bridge_port * p = to_brport(kobj);
190
191         return brport_attr->show(p, buf);
192 }
193
194 static ssize_t brport_store(struct kobject * kobj,
195                             struct attribute * attr,
196                             const char * buf, size_t count)
197 {
198         struct brport_attribute * brport_attr = to_brport_attr(attr);
199         struct net_bridge_port * p = to_brport(kobj);
200         ssize_t ret = -EINVAL;
201         char *endp;
202         unsigned long val;
203
204         if (!capable(CAP_NET_ADMIN))
205                 return -EPERM;
206
207         val = simple_strtoul(buf, &endp, 0);
208         if (endp != buf) {
209                 if (!rtnl_trylock())
210                         return restart_syscall();
211                 if (p->dev && p->br && brport_attr->store) {
212                         spin_lock_bh(&p->br->lock);
213                         ret = brport_attr->store(p, val);
214                         spin_unlock_bh(&p->br->lock);
215                         if (ret == 0)
216                                 ret = count;
217                 }
218                 rtnl_unlock();
219         }
220         return ret;
221 }
222
223 struct sysfs_ops brport_sysfs_ops = {
224         .show = brport_show,
225         .store = brport_store,
226 };
227
228 /*
229  * Add sysfs entries to ethernet device added to a bridge.
230  * Creates a brport subdirectory with bridge attributes.
231  * Puts symlink in bridge's brport subdirectory
232  */
233 int br_sysfs_addif(struct net_bridge_port *p)
234 {
235         struct net_bridge *br = p->br;
236         struct brport_attribute **a;
237         int err;
238
239         err = sysfs_create_link(&p->kobj, &br->dev->dev.kobj,
240                                 SYSFS_BRIDGE_PORT_LINK);
241         if (err)
242                 goto out2;
243
244         for (a = brport_attrs; *a; ++a) {
245                 err = sysfs_create_file(&p->kobj, &((*a)->attr));
246                 if (err)
247                         goto out2;
248         }
249
250         err = sysfs_create_link(br->ifobj, &p->kobj, p->dev->name);
251 out2:
252         return err;
253 }