[DCCP]: Fix leak in net/dccp/ipv4.c
[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                  .owner = THIS_MODULE, },                       \
34         .show   = _show,                                        \
35         .store  = _store,                                       \
36 };
37
38 static ssize_t show_path_cost(struct net_bridge_port *p, char *buf)
39 {
40         return sprintf(buf, "%d\n", p->path_cost);
41 }
42 static 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 }
47 static BRPORT_ATTR(path_cost, S_IRUGO | S_IWUSR,
48                    show_path_cost, store_path_cost);
49
50 static ssize_t show_priority(struct net_bridge_port *p, char *buf)
51 {
52         return sprintf(buf, "%d\n", p->priority);
53 }
54 static 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 }
61 static BRPORT_ATTR(priority, S_IRUGO | S_IWUSR,
62                          show_priority, store_priority);
63
64 static ssize_t show_designated_root(struct net_bridge_port *p, char *buf)
65 {
66         return br_show_bridge_id(buf, &p->designated_root);
67 }
68 static BRPORT_ATTR(designated_root, S_IRUGO, show_designated_root, NULL);
69
70 static ssize_t show_designated_bridge(struct net_bridge_port *p, char *buf)
71 {
72         return br_show_bridge_id(buf, &p->designated_bridge);
73 }
74 static BRPORT_ATTR(designated_bridge, S_IRUGO, show_designated_bridge, NULL);
75
76 static ssize_t show_designated_port(struct net_bridge_port *p, char *buf)
77 {
78         return sprintf(buf, "%d\n", p->designated_port);
79 }
80 static BRPORT_ATTR(designated_port, S_IRUGO, show_designated_port, NULL);
81
82 static ssize_t show_designated_cost(struct net_bridge_port *p, char *buf)
83 {
84         return sprintf(buf, "%d\n", p->designated_cost);
85 }
86 static BRPORT_ATTR(designated_cost, S_IRUGO, show_designated_cost, NULL);
87
88 static ssize_t show_port_id(struct net_bridge_port *p, char *buf)
89 {
90         return sprintf(buf, "0x%x\n", p->port_id);
91 }
92 static BRPORT_ATTR(port_id, S_IRUGO, show_port_id, NULL);
93
94 static 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
99 static BRPORT_ATTR(port_no, S_IRUGO, show_port_no, NULL);
100
101 static ssize_t show_change_ack(struct net_bridge_port *p, char *buf)
102 {
103         return sprintf(buf, "%d\n", p->topology_change_ack);
104 }
105 static BRPORT_ATTR(change_ack, S_IRUGO, show_change_ack, NULL);
106
107 static ssize_t show_config_pending(struct net_bridge_port *p, char *buf)
108 {
109         return sprintf(buf, "%d\n", p->config_pending);
110 }
111 static BRPORT_ATTR(config_pending, S_IRUGO, show_config_pending, NULL);
112
113 static ssize_t show_port_state(struct net_bridge_port *p, char *buf)
114 {
115         return sprintf(buf, "%d\n", p->state);
116 }
117 static BRPORT_ATTR(state, S_IRUGO, show_port_state, NULL);
118
119 static 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 }
124 static BRPORT_ATTR(message_age_timer, S_IRUGO, show_message_age_timer, NULL);
125
126 static 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 }
131 static BRPORT_ATTR(forward_delay_timer, S_IRUGO, show_forward_delay_timer, NULL);
132
133 static 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 }
138 static BRPORT_ATTR(hold_timer, S_IRUGO, show_hold_timer, NULL);
139
140 static struct brport_attribute *brport_attrs[] = {
141         &brport_attr_path_cost,
142         &brport_attr_priority,
143         &brport_attr_port_id,
144         &brport_attr_port_no,
145         &brport_attr_designated_root,
146         &brport_attr_designated_bridge,
147         &brport_attr_designated_port,
148         &brport_attr_designated_cost,
149         &brport_attr_state,
150         &brport_attr_change_ack,
151         &brport_attr_config_pending,
152         &brport_attr_message_age_timer,
153         &brport_attr_forward_delay_timer,
154         &brport_attr_hold_timer,
155         NULL
156 };
157
158 #define to_brport_attr(_at) container_of(_at, struct brport_attribute, attr)
159 #define to_brport(obj)  container_of(obj, struct net_bridge_port, kobj)
160
161 static ssize_t brport_show(struct kobject * kobj,
162                            struct attribute * attr, char * buf)
163 {
164         struct brport_attribute * brport_attr = to_brport_attr(attr);
165         struct net_bridge_port * p = to_brport(kobj);
166
167         return brport_attr->show(p, buf);
168 }
169
170 static ssize_t brport_store(struct kobject * kobj,
171                             struct attribute * attr,
172                             const char * buf, size_t count)
173 {
174         struct brport_attribute * brport_attr = to_brport_attr(attr);
175         struct net_bridge_port * p = to_brport(kobj);
176         ssize_t ret = -EINVAL;
177         char *endp;
178         unsigned long val;
179
180         if (!capable(CAP_NET_ADMIN))
181                 return -EPERM;
182
183         val = simple_strtoul(buf, &endp, 0);
184         if (endp != buf) {
185                 rtnl_lock();
186                 if (p->dev && p->br && brport_attr->store) {
187                         spin_lock_bh(&p->br->lock);
188                         ret = brport_attr->store(p, val);
189                         spin_unlock_bh(&p->br->lock);
190                         if (ret == 0)
191                                 ret = count;
192                 }
193                 rtnl_unlock();
194         }
195         return ret;
196 }
197
198 struct sysfs_ops brport_sysfs_ops = {
199         .show = brport_show,
200         .store = brport_store,
201 };
202
203 /*
204  * Add sysfs entries to ethernet device added to a bridge.
205  * Creates a brport subdirectory with bridge attributes.
206  * Puts symlink in bridge's brport subdirectory
207  */
208 int br_sysfs_addif(struct net_bridge_port *p)
209 {
210         struct net_bridge *br = p->br;
211         struct brport_attribute **a;
212         int err;
213
214         err = sysfs_create_link(&p->kobj, &br->dev->class_dev.kobj, 
215                                 SYSFS_BRIDGE_PORT_LINK);
216         if (err)
217                 goto out2;
218
219         for (a = brport_attrs; *a; ++a) {
220                 err = sysfs_create_file(&p->kobj, &((*a)->attr));
221                 if (err)
222                         goto out2;
223         }
224
225         err= sysfs_create_link(&br->ifobj, &p->kobj, p->dev->name);
226 out2:
227         return err;
228 }