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_dev(obj)     container_of(obj, struct device, kobj)
  25 #define to_bridge(cd)   ((struct net_bridge *)(to_net_dev(cd)->priv))
  26
  27 /*
  28  * Common code for storing bridge parameters.
  29  */
  30 static ssize_t store_bridge_parm(struct device *d,
  31                                  const char *buf, size_t len,
  32                                  void (*set)(struct net_bridge *, unsigned long))
  33 {
  34         struct net_bridge *br = to_bridge(d);
  35         char *endp;
  36         unsigned long val;
  37
  38         if (!capable(CAP_NET_ADMIN))
  39                 return -EPERM;
  40
  41         val = simple_strtoul(buf, &endp, 0);
  42         if (endp == buf)
  43                 return -EINVAL;
  44
  45         spin_lock_bh(&br->lock);
  46         (*set)(br, val);
  47         spin_unlock_bh(&br->lock);
  48         return len;
  49 }
  50
  51
  52 static ssize_t show_forward_delay(struct device *d,
  53                                   struct device_attribute *attr, char *buf)
  54 {
  55         struct net_bridge *br = to_bridge(d);
  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 device *d,
  68                                    struct device_attribute *attr,
  69                                    const char *buf, size_t len)
  70 {
  71         return store_bridge_parm(d, buf, len, set_forward_delay);
  72 }
  73 static DEVICE_ATTR(forward_delay, S_IRUGO | S_IWUSR,
  74                    show_forward_delay, store_forward_delay);
  75
  76 static ssize_t show_hello_time(struct device *d, struct device_attribute *attr,
  77                                char *buf)
  78 {
  79         return sprintf(buf, "%lu\n",
  80                        jiffies_to_clock_t(to_bridge(d)->hello_time));
  81 }
  82
  83 static void set_hello_time(struct net_bridge *br, unsigned long val)
  84 {
  85         unsigned long t = clock_t_to_jiffies(val);
  86         br->hello_time = t;
  87         if (br_is_root_bridge(br))
  88                 br->bridge_hello_time = t;
  89 }
  90
  91 static ssize_t store_hello_time(struct device *d,
  92                                 struct device_attribute *attr, const char *buf,
  93                                 size_t len)
  94 {
  95         return store_bridge_parm(d, buf, len, set_hello_time);
  96 }
  97 static DEVICE_ATTR(hello_time, S_IRUGO | S_IWUSR, show_hello_time,
  98                    store_hello_time);
  99
 100 static ssize_t show_max_age(struct device *d, struct device_attribute *attr,
 101                             char *buf)
 102 {
 103         return sprintf(buf, "%lu\n",
 104                        jiffies_to_clock_t(to_bridge(d)->max_age));
 105 }
 106
 107 static void set_max_age(struct net_bridge *br, unsigned long val)
 108 {
 109         unsigned long t = clock_t_to_jiffies(val);
 110         br->max_age = t;
 111         if (br_is_root_bridge(br))
 112                 br->bridge_max_age = t;
 113 }
 114
 115 static ssize_t store_max_age(struct device *d, struct device_attribute *attr,
 116                              const char *buf, size_t len)
 117 {
 118         return store_bridge_parm(d, buf, len, set_max_age);
 119 }
 120 static DEVICE_ATTR(max_age, S_IRUGO | S_IWUSR, show_max_age, store_max_age);
 121
 122 static ssize_t show_ageing_time(struct device *d,
 123                                 struct device_attribute *attr, char *buf)
 124 {
 125         struct net_bridge *br = to_bridge(d);
 126         return sprintf(buf, "%lu\n", jiffies_to_clock_t(br->ageing_time));
 127 }
 128
 129 static void set_ageing_time(struct net_bridge *br, unsigned long val)
 130 {
 131         br->ageing_time = clock_t_to_jiffies(val);
 132 }
 133
 134 static ssize_t store_ageing_time(struct device *d,
 135                                  struct device_attribute *attr,
 136                                  const char *buf, size_t len)
 137 {
 138         return store_bridge_parm(d, buf, len, set_ageing_time);
 139 }
 140 static DEVICE_ATTR(ageing_time, S_IRUGO | S_IWUSR, show_ageing_time,
 141                    store_ageing_time);
 142
 143 static ssize_t show_stp_state(struct device *d,
 144                               struct device_attribute *attr, char *buf)
 145 {
 146         struct net_bridge *br = to_bridge(d);
 147         return sprintf(buf, "%d\n", br->stp_enabled);
 148 }
 149
 150
 151 static ssize_t store_stp_state(struct device *d,
 152                                struct device_attribute *attr, const char *buf,
 153                                size_t len)
 154 {
 155         struct net_bridge *br = to_bridge(d);
 156         char *endp;
 157         unsigned long val;
 158
 159         if (!capable(CAP_NET_ADMIN))
 160                 return -EPERM;
 161
 162         val = simple_strtoul(buf, &endp, 0);
 163         if (endp == buf)
 164                 return -EINVAL;
 165
 166         rtnl_lock();
 167         br_stp_set_enabled(br, val);
 168         rtnl_unlock();
 169
 170         return len;
 171 }
 172 static DEVICE_ATTR(stp_state, S_IRUGO | S_IWUSR, show_stp_state,
 173                    store_stp_state);
 174
 175 static ssize_t show_priority(struct device *d, struct device_attribute *attr,
 176                              char *buf)
 177 {
 178         struct net_bridge *br = to_bridge(d);
 179         return sprintf(buf, "%d\n",
 180                        (br->bridge_id.prio[0] << 8) | br->bridge_id.prio[1]);
 181 }
 182
 183 static void set_priority(struct net_bridge *br, unsigned long val)
 184 {
 185         br_stp_set_bridge_priority(br, (u16) val);
 186 }
 187
 188 static ssize_t store_priority(struct device *d, struct device_attribute *attr,
 189                                const char *buf, size_t len)
 190 {
 191         return store_bridge_parm(d, buf, len, set_priority);
 192 }
 193 static DEVICE_ATTR(priority, S_IRUGO | S_IWUSR, show_priority, store_priority);
 194
 195 static ssize_t show_root_id(struct device *d, struct device_attribute *attr,
 196                             char *buf)
 197 {
 198         return br_show_bridge_id(buf, &to_bridge(d)->designated_root);
 199 }
 200 static DEVICE_ATTR(root_id, S_IRUGO, show_root_id, NULL);
 201
 202 static ssize_t show_bridge_id(struct device *d, struct device_attribute *attr,
 203                               char *buf)
 204 {
 205         return br_show_bridge_id(buf, &to_bridge(d)->bridge_id);
 206 }
 207 static DEVICE_ATTR(bridge_id, S_IRUGO, show_bridge_id, NULL);
 208
 209 static ssize_t show_root_port(struct device *d, struct device_attribute *attr,
 210                               char *buf)
 211 {
 212         return sprintf(buf, "%d\n", to_bridge(d)->root_port);
 213 }
 214 static DEVICE_ATTR(root_port, S_IRUGO, show_root_port, NULL);
 215
 216 static ssize_t show_root_path_cost(struct device *d,
 217                                    struct device_attribute *attr, char *buf)
 218 {
 219         return sprintf(buf, "%d\n", to_bridge(d)->root_path_cost);
 220 }
 221 static DEVICE_ATTR(root_path_cost, S_IRUGO, show_root_path_cost, NULL);
 222
 223 static ssize_t show_topology_change(struct device *d,
 224                                     struct device_attribute *attr, char *buf)
 225 {
 226         return sprintf(buf, "%d\n", to_bridge(d)->topology_change);
 227 }
 228 static DEVICE_ATTR(topology_change, S_IRUGO, show_topology_change, NULL);
 229
 230 static ssize_t show_topology_change_detected(struct device *d,
 231                                              struct device_attribute *attr,
 232                                              char *buf)
 233 {
 234         struct net_bridge *br = to_bridge(d);
 235         return sprintf(buf, "%d\n", br->topology_change_detected);
 236 }
 237 static DEVICE_ATTR(topology_change_detected, S_IRUGO,
 238                    show_topology_change_detected, NULL);
 239
 240 static ssize_t show_hello_timer(struct device *d,
 241                                 struct device_attribute *attr, char *buf)
 242 {
 243         struct net_bridge *br = to_bridge(d);
 244         return sprintf(buf, "%ld\n", br_timer_value(&br->hello_timer));
 245 }
 246 static DEVICE_ATTR(hello_timer, S_IRUGO, show_hello_timer, NULL);
 247
 248 static ssize_t show_tcn_timer(struct device *d, struct device_attribute *attr,
 249                               char *buf)
 250 {
 251         struct net_bridge *br = to_bridge(d);
 252         return sprintf(buf, "%ld\n", br_timer_value(&br->tcn_timer));
 253 }
 254 static DEVICE_ATTR(tcn_timer, S_IRUGO, show_tcn_timer, NULL);
 255
 256 static ssize_t show_topology_change_timer(struct device *d,
 257                                           struct device_attribute *attr,
 258                                           char *buf)
 259 {
 260         struct net_bridge *br = to_bridge(d);
 261         return sprintf(buf, "%ld\n", br_timer_value(&br->topology_change_timer));
 262 }
 263 static DEVICE_ATTR(topology_change_timer, S_IRUGO, show_topology_change_timer,
 264                    NULL);
 265
 266 static ssize_t show_gc_timer(struct device *d, struct device_attribute *attr,
 267                              char *buf)
 268 {
 269         struct net_bridge *br = to_bridge(d);
 270         return sprintf(buf, "%ld\n", br_timer_value(&br->gc_timer));
 271 }
 272 static DEVICE_ATTR(gc_timer, S_IRUGO, show_gc_timer, NULL);
 273
 274 static ssize_t show_group_addr(struct device *d,
 275                                struct device_attribute *attr, char *buf)
 276 {
 277         struct net_bridge *br = to_bridge(d);
 278         return sprintf(buf, "%x:%x:%x:%x:%x:%x\n",
 279                        br->group_addr[0], br->group_addr[1],
 280                        br->group_addr[2], br->group_addr[3],
 281                        br->group_addr[4], br->group_addr[5]);
 282 }
 283
 284 static ssize_t store_group_addr(struct device *d,
 285                                 struct device_attribute *attr,
 286                                 const char *buf, size_t len)
 287 {
 288         struct net_bridge *br = to_bridge(d);
 289         unsigned new_addr[6];
 290         int i;
 291
 292         if (!capable(CAP_NET_ADMIN))
 293                 return -EPERM;
 294
 295         if (sscanf(buf, "%x:%x:%x:%x:%x:%x",
 296                    &new_addr[0], &new_addr[1], &new_addr[2],
 297                    &new_addr[3], &new_addr[4], &new_addr[5]) != 6)
 298                 return -EINVAL;
 299
 300         /* Must be 01:80:c2:00:00:0X */
 301         for (i = 0; i < 5; i++)
 302                 if (new_addr[i] != br_group_address[i])
 303                         return -EINVAL;
 304
 305         if (new_addr[5] & ~0xf)
 306                 return -EINVAL;
 307
 308         if (new_addr[5] == 1    /* 802.3x Pause address */
 309             || new_addr[5] == 2 /* 802.3ad Slow protocols */
 310             || new_addr[5] == 3) /* 802.1X PAE address */
 311                 return -EINVAL;
 312
 313         spin_lock_bh(&br->lock);
 314         for (i = 0; i < 6; i++)
 315                 br->group_addr[i] = new_addr[i];
 316         spin_unlock_bh(&br->lock);
 317         return len;
 318 }
 319
 320 static DEVICE_ATTR(group_addr, S_IRUGO | S_IWUSR,
 321                    show_group_addr, store_group_addr);
 322
 323 static ssize_t store_flush(struct device *d,
 324                            struct device_attribute *attr,
 325                            const char *buf, size_t len)
 326 {
 327         struct net_bridge *br = to_bridge(d);
 328
 329         if (!capable(CAP_NET_ADMIN))
 330                 return -EPERM;
 331
 332         br_fdb_flush(br);
 333         return len;
 334 }
 335 static DEVICE_ATTR(flush, S_IWUSR, NULL, store_flush);
 336
 337 static struct attribute *bridge_attrs[] = {
 338         &dev_attr_forward_delay.attr,
 339         &dev_attr_hello_time.attr,
 340         &dev_attr_max_age.attr,
 341         &dev_attr_ageing_time.attr,
 342         &dev_attr_stp_state.attr,
 343         &dev_attr_priority.attr,
 344         &dev_attr_bridge_id.attr,
 345         &dev_attr_root_id.attr,
 346         &dev_attr_root_path_cost.attr,
 347         &dev_attr_root_port.attr,
 348         &dev_attr_topology_change.attr,
 349         &dev_attr_topology_change_detected.attr,
 350         &dev_attr_hello_timer.attr,
 351         &dev_attr_tcn_timer.attr,
 352         &dev_attr_topology_change_timer.attr,
 353         &dev_attr_gc_timer.attr,
 354         &dev_attr_group_addr.attr,
 355         &dev_attr_flush.attr,
 356         NULL
 357 };
 358
 359 static struct attribute_group bridge_group = {
 360         .name = SYSFS_BRIDGE_ATTR,
 361         .attrs = bridge_attrs,
 362 };
 363
 364 /*
 365  * Export the forwarding information table as a binary file
 366  * The records are struct __fdb_entry.
 367  *
 368  * Returns the number of bytes read.
 369  */
 370 static ssize_t brforward_read(struct kobject *kobj,
 371                               struct bin_attribute *bin_attr,
 372                               char *buf, loff_t off, size_t count)
 373 {
 374         struct device *dev = to_dev(kobj);
 375         struct net_bridge *br = to_bridge(dev);
 376         int n;
 377
 378         /* must read whole records */
 379         if (off % sizeof(struct __fdb_entry) != 0)
 380                 return -EINVAL;
 381
 382         n =  br_fdb_fillbuf(br, buf,
 383                             count / sizeof(struct __fdb_entry),
 384                             off / sizeof(struct __fdb_entry));
 385
 386         if (n > 0)
 387                 n *= sizeof(struct __fdb_entry);
 388
 389         return n;
 390 }
 391
 392 static struct bin_attribute bridge_forward = {
 393         .attr = { .name = SYSFS_BRIDGE_FDB,
 394                   .mode = S_IRUGO, },
 395         .read = brforward_read,
 396 };
 397
 398 /*
 399  * Add entries in sysfs onto the existing network class device
 400  * for the bridge.
 401  *   Adds a attribute group "bridge" containing tuning parameters.
 402  *   Binary attribute containing the forward table
 403  *   Sub directory to hold links to interfaces.
 404  *
 405  * Note: the ifobj exists only to be a subdirectory
 406  *   to hold links.  The ifobj exists in same data structure
 407  *   as it's parent the bridge so reference counting works.
 408  */
 409 int br_sysfs_addbr(struct net_device *dev)
 410 {
 411         struct kobject *brobj = &dev->dev.kobj;
 412         struct net_bridge *br = netdev_priv(dev);
 413         int err;
 414
 415         err = sysfs_create_group(brobj, &bridge_group);
 416         if (err) {
 417                 pr_info("%s: can't create group %s/%s\n",
 418                         __func__, dev->name, bridge_group.name);
 419                 goto out1;
 420         }
 421
 422         err = sysfs_create_bin_file(brobj, &bridge_forward);
 423         if (err) {
 424                 pr_info("%s: can't create attribute file %s/%s\n",
 425                         __func__, dev->name, bridge_forward.attr.name);
 426                 goto out2;
 427         }
 428
 429         br->ifobj = kobject_create_and_add(SYSFS_BRIDGE_PORT_SUBDIR, brobj);
 430         if (!br->ifobj) {
 431                 pr_info("%s: can't add kobject (directory) %s/%s\n",
 432                         __func__, dev->name, SYSFS_BRIDGE_PORT_SUBDIR);
 433                 goto out3;
 434         }
 435         return 0;
 436  out3:
 437         sysfs_remove_bin_file(&dev->dev.kobj, &bridge_forward);
 438  out2:
 439         sysfs_remove_group(&dev->dev.kobj, &bridge_group);
 440  out1:
 441         return err;
 442
 443 }
 444
 445 void br_sysfs_delbr(struct net_device *dev)
 446 {
 447         struct kobject *kobj = &dev->dev.kobj;
 448         struct net_bridge *br = netdev_priv(dev);
 449
 450         kobject_put(br->ifobj);
 451         sysfs_remove_bin_file(kobj, &bridge_forward);
 452         sysfs_remove_group(kobj, &bridge_group);
 453 }