[NETFILTER]: Fix possible overflow in netfilters do_replace()
[linux-2.6.git] / net / bridge / br_sysfs_br.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 #include <linux/times.h>
21
22 #include "br_private.h"
23
24 #define to_class_dev(obj) container_of(obj,struct class_device,kobj)
25 #define to_net_dev(class) container_of(class, struct net_device, class_dev)
26 #define to_bridge(cd)   ((struct net_bridge *)(to_net_dev(cd)->priv))
27
28 /*
29  * Common code for storing bridge parameters.
30  */
31 static ssize_t store_bridge_parm(struct class_device *cd,
32                                  const char *buf, size_t len,
33                                  void (*set)(struct net_bridge *, unsigned long))
34 {
35         struct net_bridge *br = to_bridge(cd);
36         char *endp;
37         unsigned long val;
38
39         if (!capable(CAP_NET_ADMIN))
40                 return -EPERM;
41
42         val = simple_strtoul(buf, &endp, 0);
43         if (endp == buf)
44                 return -EINVAL;
45
46         spin_lock_bh(&br->lock);
47         (*set)(br, val);
48         spin_unlock_bh(&br->lock);
49         return len;
50 }
51
52
53 static ssize_t show_forward_delay(struct class_device *cd, char *buf)
54 {
55         struct net_bridge *br = to_bridge(cd);
56         return sprintf(buf, "%lu\n", jiffies_to_clock_t(br->forward_delay));
57 }
58
59 static void set_forward_delay(struct net_bridge *br, unsigned long val)
60 {
61         unsigned long delay = clock_t_to_jiffies(val);
62         br->forward_delay = delay;
63         if (br_is_root_bridge(br))
64                 br->bridge_forward_delay = delay;
65 }
66
67 static ssize_t store_forward_delay(struct class_device *cd, const char *buf,
68                                    size_t len)
69 {
70         return store_bridge_parm(cd, buf, len, set_forward_delay);
71 }
72 static CLASS_DEVICE_ATTR(forward_delay, S_IRUGO | S_IWUSR,
73                          show_forward_delay, store_forward_delay);
74
75 static ssize_t show_hello_time(struct class_device *cd, char *buf)
76 {
77         return sprintf(buf, "%lu\n",
78                        jiffies_to_clock_t(to_bridge(cd)->hello_time));
79 }
80
81 static void set_hello_time(struct net_bridge *br, unsigned long val)
82 {
83         unsigned long t = clock_t_to_jiffies(val);
84         br->hello_time = t;
85         if (br_is_root_bridge(br))
86                 br->bridge_hello_time = t;
87 }
88
89 static ssize_t store_hello_time(struct class_device *cd, const char *buf,
90                                 size_t len)
91 {
92         return store_bridge_parm(cd, buf, len, set_hello_time);
93 }
94
95 static CLASS_DEVICE_ATTR(hello_time, S_IRUGO | S_IWUSR, show_hello_time,
96                          store_hello_time);
97
98 static ssize_t show_max_age(struct class_device *cd, char *buf)
99 {
100         return sprintf(buf, "%lu\n",
101                        jiffies_to_clock_t(to_bridge(cd)->max_age));
102 }
103
104 static void set_max_age(struct net_bridge *br, unsigned long val)
105 {
106         unsigned long t = clock_t_to_jiffies(val);
107         br->max_age = t;
108         if (br_is_root_bridge(br))
109                 br->bridge_max_age = t;
110 }
111
112 static ssize_t store_max_age(struct class_device *cd, const char *buf,
113                                 size_t len)
114 {
115         return store_bridge_parm(cd, buf, len, set_max_age);
116 }
117
118 static CLASS_DEVICE_ATTR(max_age, S_IRUGO | S_IWUSR, show_max_age,
119                          store_max_age);
120
121 static ssize_t show_ageing_time(struct class_device *cd, char *buf)
122 {
123         struct net_bridge *br = to_bridge(cd);
124         return sprintf(buf, "%lu\n", jiffies_to_clock_t(br->ageing_time));
125 }
126
127 static void set_ageing_time(struct net_bridge *br, unsigned long val)
128 {
129         br->ageing_time = clock_t_to_jiffies(val);
130 }
131
132 static ssize_t store_ageing_time(struct class_device *cd, const char *buf,
133                                  size_t len)
134 {
135         return store_bridge_parm(cd, buf, len, set_ageing_time);
136 }
137
138 static CLASS_DEVICE_ATTR(ageing_time, S_IRUGO | S_IWUSR, show_ageing_time,
139                          store_ageing_time);
140 static ssize_t show_stp_state(struct class_device *cd, char *buf)
141 {
142         struct net_bridge *br = to_bridge(cd);
143         return sprintf(buf, "%d\n", br->stp_enabled);
144 }
145
146 static void set_stp_state(struct net_bridge *br, unsigned long val)
147 {
148         br->stp_enabled = val;
149 }
150
151 static ssize_t store_stp_state(struct class_device *cd,
152                                const char *buf, size_t len)
153 {
154         return store_bridge_parm(cd, buf, len, set_stp_state);
155 }
156
157 static CLASS_DEVICE_ATTR(stp_state, S_IRUGO | S_IWUSR, show_stp_state,
158                          store_stp_state);
159
160 static ssize_t show_priority(struct class_device *cd, char *buf)
161 {
162         struct net_bridge *br = to_bridge(cd);
163         return sprintf(buf, "%d\n",
164                        (br->bridge_id.prio[0] << 8) | br->bridge_id.prio[1]);
165 }
166
167 static void set_priority(struct net_bridge *br, unsigned long val)
168 {
169         br_stp_set_bridge_priority(br, (u16) val);
170 }
171
172 static ssize_t store_priority(struct class_device *cd,
173                                const char *buf, size_t len)
174 {
175         return store_bridge_parm(cd, buf, len, set_priority);
176 }
177 static CLASS_DEVICE_ATTR(priority, S_IRUGO | S_IWUSR, show_priority,
178                          store_priority);
179
180 static ssize_t show_root_id(struct class_device *cd, char *buf)
181 {
182         return br_show_bridge_id(buf, &to_bridge(cd)->designated_root);
183 }
184 static CLASS_DEVICE_ATTR(root_id, S_IRUGO, show_root_id, NULL);
185
186 static ssize_t show_bridge_id(struct class_device *cd, char *buf)
187 {
188         return br_show_bridge_id(buf, &to_bridge(cd)->bridge_id);
189 }
190 static CLASS_DEVICE_ATTR(bridge_id, S_IRUGO, show_bridge_id, NULL);
191
192 static ssize_t show_root_port(struct class_device *cd, char *buf)
193 {
194         return sprintf(buf, "%d\n", to_bridge(cd)->root_port);
195 }
196 static CLASS_DEVICE_ATTR(root_port, S_IRUGO, show_root_port, NULL);
197
198 static ssize_t show_root_path_cost(struct class_device *cd, char *buf)
199 {
200         return sprintf(buf, "%d\n", to_bridge(cd)->root_path_cost);
201 }
202 static CLASS_DEVICE_ATTR(root_path_cost, S_IRUGO, show_root_path_cost, NULL);
203
204 static ssize_t show_topology_change(struct class_device *cd, char *buf)
205 {
206         return sprintf(buf, "%d\n", to_bridge(cd)->topology_change);
207 }
208 static CLASS_DEVICE_ATTR(topology_change, S_IRUGO, show_topology_change, NULL);
209
210 static ssize_t show_topology_change_detected(struct class_device *cd, char *buf)
211 {
212         struct net_bridge *br = to_bridge(cd);
213         return sprintf(buf, "%d\n", br->topology_change_detected);
214 }
215 static CLASS_DEVICE_ATTR(topology_change_detected, S_IRUGO, show_topology_change_detected, NULL);
216
217 static ssize_t show_hello_timer(struct class_device *cd, char *buf)
218 {
219         struct net_bridge *br = to_bridge(cd);
220         return sprintf(buf, "%ld\n", br_timer_value(&br->hello_timer));
221 }
222 static CLASS_DEVICE_ATTR(hello_timer, S_IRUGO, show_hello_timer, NULL);
223
224 static ssize_t show_tcn_timer(struct class_device *cd, char *buf)
225 {
226         struct net_bridge *br = to_bridge(cd);
227         return sprintf(buf, "%ld\n", br_timer_value(&br->tcn_timer));
228 }
229 static CLASS_DEVICE_ATTR(tcn_timer, S_IRUGO, show_tcn_timer, NULL);
230
231 static ssize_t show_topology_change_timer(struct class_device *cd, char *buf)
232 {
233         struct net_bridge *br = to_bridge(cd);
234         return sprintf(buf, "%ld\n", br_timer_value(&br->topology_change_timer));
235 }
236 static CLASS_DEVICE_ATTR(topology_change_timer, S_IRUGO, show_topology_change_timer, NULL);
237
238 static ssize_t show_gc_timer(struct class_device *cd, char *buf)
239 {
240         struct net_bridge *br = to_bridge(cd);
241         return sprintf(buf, "%ld\n", br_timer_value(&br->gc_timer));
242 }
243 static CLASS_DEVICE_ATTR(gc_timer, S_IRUGO, show_gc_timer, NULL);
244
245 static struct attribute *bridge_attrs[] = {
246         &class_device_attr_forward_delay.attr,
247         &class_device_attr_hello_time.attr,
248         &class_device_attr_max_age.attr,
249         &class_device_attr_ageing_time.attr,
250         &class_device_attr_stp_state.attr,
251         &class_device_attr_priority.attr,
252         &class_device_attr_bridge_id.attr,
253         &class_device_attr_root_id.attr,
254         &class_device_attr_root_path_cost.attr,
255         &class_device_attr_root_port.attr,
256         &class_device_attr_topology_change.attr,
257         &class_device_attr_topology_change_detected.attr,
258         &class_device_attr_hello_timer.attr,
259         &class_device_attr_tcn_timer.attr,
260         &class_device_attr_topology_change_timer.attr,
261         &class_device_attr_gc_timer.attr,
262         NULL
263 };
264
265 static struct attribute_group bridge_group = {
266         .name = SYSFS_BRIDGE_ATTR,
267         .attrs = bridge_attrs,
268 };
269
270 /*
271  * Export the forwarding information table as a binary file
272  * The records are struct __fdb_entry.
273  *
274  * Returns the number of bytes read.
275  */
276 static ssize_t brforward_read(struct kobject *kobj, char *buf,
277                            loff_t off, size_t count)
278 {
279         struct class_device *cdev = to_class_dev(kobj);
280         struct net_bridge *br = to_bridge(cdev);
281         int n;
282
283         /* must read whole records */
284         if (off % sizeof(struct __fdb_entry) != 0)
285                 return -EINVAL;
286
287         n =  br_fdb_fillbuf(br, buf, 
288                             count / sizeof(struct __fdb_entry),
289                             off / sizeof(struct __fdb_entry));
290
291         if (n > 0)
292                 n *= sizeof(struct __fdb_entry);
293         
294         return n;
295 }
296
297 static struct bin_attribute bridge_forward = {
298         .attr = { .name = SYSFS_BRIDGE_FDB,
299                   .mode = S_IRUGO, 
300                   .owner = THIS_MODULE, },
301         .read = brforward_read,
302 };
303
304 /*
305  * Add entries in sysfs onto the existing network class device
306  * for the bridge.
307  *   Adds a attribute group "bridge" containing tuning parameters.
308  *   Binary attribute containing the forward table
309  *   Sub directory to hold links to interfaces.
310  *
311  * Note: the ifobj exists only to be a subdirectory
312  *   to hold links.  The ifobj exists in same data structure
313  *   as it's parent the bridge so reference counting works.
314  */
315 int br_sysfs_addbr(struct net_device *dev)
316 {
317         struct kobject *brobj = &dev->class_dev.kobj;
318         struct net_bridge *br = netdev_priv(dev);
319         int err;
320
321         err = sysfs_create_group(brobj, &bridge_group);
322         if (err) {
323                 pr_info("%s: can't create group %s/%s\n",
324                         __FUNCTION__, dev->name, bridge_group.name);
325                 goto out1;
326         }
327
328         err = sysfs_create_bin_file(brobj, &bridge_forward);
329         if (err) {
330                 pr_info("%s: can't create attribue file %s/%s\n",
331                         __FUNCTION__, dev->name, bridge_forward.attr.name);
332                 goto out2;
333         }
334
335         
336         kobject_set_name(&br->ifobj, SYSFS_BRIDGE_PORT_SUBDIR);
337         br->ifobj.ktype = NULL;
338         br->ifobj.kset = NULL;
339         br->ifobj.parent = brobj;
340
341         err = kobject_register(&br->ifobj);
342         if (err) {
343                 pr_info("%s: can't add kobject (directory) %s/%s\n",
344                         __FUNCTION__, dev->name, br->ifobj.name);
345                 goto out3;
346         }
347         return 0;
348  out3:
349         sysfs_remove_bin_file(&dev->class_dev.kobj, &bridge_forward);
350  out2:
351         sysfs_remove_group(&dev->class_dev.kobj, &bridge_group);
352  out1:
353         return err;
354
355 }
356
357 void br_sysfs_delbr(struct net_device *dev)
358 {
359         struct kobject *kobj = &dev->class_dev.kobj;
360         struct net_bridge *br = netdev_priv(dev);
361
362         kobject_unregister(&br->ifobj);
363         sysfs_remove_bin_file(kobj, &bridge_forward);
364         sysfs_remove_group(kobj, &bridge_group);
365 }