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 }