net/core/net-sysfs.c

   1 /*
   2  * net-sysfs.c - network device class and attributes
   3  *
   4  * Copyright (c) 2003 Stephen Hemminger <shemminger@osdl.org>
   5  *
   6  *      This program is free software; you can redistribute it and/or
   7  *      modify it under the terms of the GNU General Public License
   8  *      as published by the Free Software Foundation; either version
   9  *      2 of the License, or (at your option) any later version.
  10  */
  11
  12 #include <linux/capability.h>
  13 #include <linux/config.h>
  14 #include <linux/kernel.h>
  15 #include <linux/netdevice.h>
  16 #include <linux/if_arp.h>
  17 #include <net/sock.h>
  18 #include <linux/rtnetlink.h>
  19 #include <linux/wireless.h>
  20 #include <net/iw_handler.h>
  21
  22 #define to_class_dev(obj) container_of(obj,struct class_device,kobj)
  23 #define to_net_dev(class) container_of(class, struct net_device, class_dev)
  24
  25 static const char fmt_hex[] = "%#x\n";
  26 static const char fmt_long_hex[] = "%#lx\n";
  27 static const char fmt_dec[] = "%d\n";
  28 static const char fmt_ulong[] = "%lu\n";
  29
  30 static inline int dev_isalive(const struct net_device *dev)
  31 {
  32         return dev->reg_state == NETREG_REGISTERED;
  33 }
  34
  35 /* use same locking rules as GIF* ioctl's */
  36 static ssize_t netdev_show(const struct class_device *cd, char *buf,
  37                            ssize_t (*format)(const struct net_device *, char *))
  38 {
  39         struct net_device *net = to_net_dev(cd);
  40         ssize_t ret = -EINVAL;
  41
  42         read_lock(&dev_base_lock);
  43         if (dev_isalive(net))
  44                 ret = (*format)(net, buf);
  45         read_unlock(&dev_base_lock);
  46
  47         return ret;
  48 }
  49
  50 /* generate a show function for simple field */
  51 #define NETDEVICE_SHOW(field, format_string)                            \
  52 static ssize_t format_##field(const struct net_device *net, char *buf)  \
  53 {                                                                       \
  54         return sprintf(buf, format_string, net->field);                 \
  55 }                                                                       \
  56 static ssize_t show_##field(struct class_device *cd, char *buf)         \
  57 {                                                                       \
  58         return netdev_show(cd, buf, format_##field);                    \
  59 }
  60
  61
  62 /* use same locking and permission rules as SIF* ioctl's */
  63 static ssize_t netdev_store(struct class_device *dev,
  64                             const char *buf, size_t len,
  65                             int (*set)(struct net_device *, unsigned long))
  66 {
  67         struct net_device *net = to_net_dev(dev);
  68         char *endp;
  69         unsigned long new;
  70         int ret = -EINVAL;
  71
  72         if (!capable(CAP_NET_ADMIN))
  73                 return -EPERM;
  74
  75         new = simple_strtoul(buf, &endp, 0);
  76         if (endp == buf)
  77                 goto err;
  78
  79         rtnl_lock();
  80         if (dev_isalive(net)) {
  81                 if ((ret = (*set)(net, new)) == 0)
  82                         ret = len;
  83         }
  84         rtnl_unlock();
  85  err:
  86         return ret;
  87 }
  88
  89 NETDEVICE_SHOW(addr_len, fmt_dec);
  90 NETDEVICE_SHOW(iflink, fmt_dec);
  91 NETDEVICE_SHOW(ifindex, fmt_dec);
  92 NETDEVICE_SHOW(features, fmt_long_hex);
  93 NETDEVICE_SHOW(type, fmt_dec);
  94
  95 /* use same locking rules as GIFHWADDR ioctl's */
  96 static ssize_t format_addr(char *buf, const unsigned char *addr, int len)
  97 {
  98         int i;
  99         char *cp = buf;
 100
 101         for (i = 0; i < len; i++)
 102                 cp += sprintf(cp, "%02x%c", addr[i],
 103                               i == (len - 1) ? '\n' : ':');
 104         return cp - buf;
 105 }
 106
 107 static ssize_t show_address(struct class_device *dev, char *buf)
 108 {
 109         struct net_device *net = to_net_dev(dev);
 110         ssize_t ret = -EINVAL;
 111
 112         read_lock(&dev_base_lock);
 113         if (dev_isalive(net))
 114             ret = format_addr(buf, net->dev_addr, net->addr_len);
 115         read_unlock(&dev_base_lock);
 116         return ret;
 117 }
 118
 119 static ssize_t show_broadcast(struct class_device *dev, char *buf)
 120 {
 121         struct net_device *net = to_net_dev(dev);
 122         if (dev_isalive(net))
 123                 return format_addr(buf, net->broadcast, net->addr_len);
 124         return -EINVAL;
 125 }
 126
 127 static ssize_t show_carrier(struct class_device *dev, char *buf)
 128 {
 129         struct net_device *netdev = to_net_dev(dev);
 130         if (netif_running(netdev)) {
 131                 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
 132         }
 133         return -EINVAL;
 134 }
 135
 136 /* read-write attributes */
 137 NETDEVICE_SHOW(mtu, fmt_dec);
 138
 139 static int change_mtu(struct net_device *net, unsigned long new_mtu)
 140 {
 141         return dev_set_mtu(net, (int) new_mtu);
 142 }
 143
 144 static ssize_t store_mtu(struct class_device *dev, const char *buf, size_t len)
 145 {
 146         return netdev_store(dev, buf, len, change_mtu);
 147 }
 148
 149 NETDEVICE_SHOW(flags, fmt_hex);
 150
 151 static int change_flags(struct net_device *net, unsigned long new_flags)
 152 {
 153         return dev_change_flags(net, (unsigned) new_flags);
 154 }
 155
 156 static ssize_t store_flags(struct class_device *dev, const char *buf, size_t len)
 157 {
 158         return netdev_store(dev, buf, len, change_flags);
 159 }
 160
 161 NETDEVICE_SHOW(tx_queue_len, fmt_ulong);
 162
 163 static int change_tx_queue_len(struct net_device *net, unsigned long new_len)
 164 {
 165         net->tx_queue_len = new_len;
 166         return 0;
 167 }
 168
 169 static ssize_t store_tx_queue_len(struct class_device *dev, const char *buf, size_t len)
 170 {
 171         return netdev_store(dev, buf, len, change_tx_queue_len);
 172 }
 173
 174 NETDEVICE_SHOW(weight, fmt_dec);
 175
 176 static int change_weight(struct net_device *net, unsigned long new_weight)
 177 {
 178         net->weight = new_weight;
 179         return 0;
 180 }
 181
 182 static ssize_t store_weight(struct class_device *dev, const char *buf, size_t len)
 183 {
 184         return netdev_store(dev, buf, len, change_weight);
 185 }
 186
 187 static struct class_device_attribute net_class_attributes[] = {
 188         __ATTR(addr_len, S_IRUGO, show_addr_len, NULL),
 189         __ATTR(iflink, S_IRUGO, show_iflink, NULL),
 190         __ATTR(ifindex, S_IRUGO, show_ifindex, NULL),
 191         __ATTR(features, S_IRUGO, show_features, NULL),
 192         __ATTR(type, S_IRUGO, show_type, NULL),
 193         __ATTR(address, S_IRUGO, show_address, NULL),
 194         __ATTR(broadcast, S_IRUGO, show_broadcast, NULL),
 195         __ATTR(carrier, S_IRUGO, show_carrier, NULL),
 196         __ATTR(mtu, S_IRUGO | S_IWUSR, show_mtu, store_mtu),
 197         __ATTR(flags, S_IRUGO | S_IWUSR, show_flags, store_flags),
 198         __ATTR(tx_queue_len, S_IRUGO | S_IWUSR, show_tx_queue_len,
 199                store_tx_queue_len),
 200         __ATTR(weight, S_IRUGO | S_IWUSR, show_weight, store_weight),
 201         {}
 202 };
 203
 204 /* Show a given an attribute in the statistics group */
 205 static ssize_t netstat_show(const struct class_device *cd, char *buf,
 206                             unsigned long offset)
 207 {
 208         struct net_device *dev = to_net_dev(cd);
 209         struct net_device_stats *stats;
 210         ssize_t ret = -EINVAL;
 211
 212         if (offset > sizeof(struct net_device_stats) ||
 213             offset % sizeof(unsigned long) != 0)
 214                 WARN_ON(1);
 215
 216         read_lock(&dev_base_lock);
 217         if (dev_isalive(dev) && dev->get_stats &&
 218             (stats = (*dev->get_stats)(dev)))
 219                 ret = sprintf(buf, fmt_ulong,
 220                               *(unsigned long *)(((u8 *) stats) + offset));
 221
 222         read_unlock(&dev_base_lock);
 223         return ret;
 224 }
 225
 226 /* generate a read-only statistics attribute */
 227 #define NETSTAT_ENTRY(name)                                             \
 228 static ssize_t show_##name(struct class_device *cd, char *buf)          \
 229 {                                                                       \
 230         return netstat_show(cd, buf,                                    \
 231                             offsetof(struct net_device_stats, name));   \
 232 }                                                                       \
 233 static CLASS_DEVICE_ATTR(name, S_IRUGO, show_##name, NULL)
 234
 235 NETSTAT_ENTRY(rx_packets);
 236 NETSTAT_ENTRY(tx_packets);
 237 NETSTAT_ENTRY(rx_bytes);
 238 NETSTAT_ENTRY(tx_bytes);
 239 NETSTAT_ENTRY(rx_errors);
 240 NETSTAT_ENTRY(tx_errors);
 241 NETSTAT_ENTRY(rx_dropped);
 242 NETSTAT_ENTRY(tx_dropped);
 243 NETSTAT_ENTRY(multicast);
 244 NETSTAT_ENTRY(collisions);
 245 NETSTAT_ENTRY(rx_length_errors);
 246 NETSTAT_ENTRY(rx_over_errors);
 247 NETSTAT_ENTRY(rx_crc_errors);
 248 NETSTAT_ENTRY(rx_frame_errors);
 249 NETSTAT_ENTRY(rx_fifo_errors);
 250 NETSTAT_ENTRY(rx_missed_errors);
 251 NETSTAT_ENTRY(tx_aborted_errors);
 252 NETSTAT_ENTRY(tx_carrier_errors);
 253 NETSTAT_ENTRY(tx_fifo_errors);
 254 NETSTAT_ENTRY(tx_heartbeat_errors);
 255 NETSTAT_ENTRY(tx_window_errors);
 256 NETSTAT_ENTRY(rx_compressed);
 257 NETSTAT_ENTRY(tx_compressed);
 258
 259 static struct attribute *netstat_attrs[] = {
 260         &class_device_attr_rx_packets.attr,
 261         &class_device_attr_tx_packets.attr,
 262         &class_device_attr_rx_bytes.attr,
 263         &class_device_attr_tx_bytes.attr,
 264         &class_device_attr_rx_errors.attr,
 265         &class_device_attr_tx_errors.attr,
 266         &class_device_attr_rx_dropped.attr,
 267         &class_device_attr_tx_dropped.attr,
 268         &class_device_attr_multicast.attr,
 269         &class_device_attr_collisions.attr,
 270         &class_device_attr_rx_length_errors.attr,
 271         &class_device_attr_rx_over_errors.attr,
 272         &class_device_attr_rx_crc_errors.attr,
 273         &class_device_attr_rx_frame_errors.attr,
 274         &class_device_attr_rx_fifo_errors.attr,
 275         &class_device_attr_rx_missed_errors.attr,
 276         &class_device_attr_tx_aborted_errors.attr,
 277         &class_device_attr_tx_carrier_errors.attr,
 278         &class_device_attr_tx_fifo_errors.attr,
 279         &class_device_attr_tx_heartbeat_errors.attr,
 280         &class_device_attr_tx_window_errors.attr,
 281         &class_device_attr_rx_compressed.attr,
 282         &class_device_attr_tx_compressed.attr,
 283         NULL
 284 };
 285
 286
 287 static struct attribute_group netstat_group = {
 288         .name  = "statistics",
 289         .attrs  = netstat_attrs,
 290 };
 291
 292 #ifdef WIRELESS_EXT
 293 /* helper function that does all the locking etc for wireless stats */
 294 static ssize_t wireless_show(struct class_device *cd, char *buf,
 295                              ssize_t (*format)(const struct iw_statistics *,
 296                                                char *))
 297 {
 298         struct net_device *dev = to_net_dev(cd);
 299         const struct iw_statistics *iw = NULL;
 300         ssize_t ret = -EINVAL;
 301
 302         read_lock(&dev_base_lock);
 303         if (dev_isalive(dev)) {
 304                 if(dev->wireless_handlers &&
 305                    dev->wireless_handlers->get_wireless_stats)
 306                         iw = dev->wireless_handlers->get_wireless_stats(dev);
 307                 else if (dev->get_wireless_stats)
 308                         iw = dev->get_wireless_stats(dev);
 309                 if (iw != NULL)
 310                         ret = (*format)(iw, buf);
 311         }
 312         read_unlock(&dev_base_lock);
 313
 314         return ret;
 315 }
 316
 317 /* show function template for wireless fields */
 318 #define WIRELESS_SHOW(name, field, format_string)                       \
 319 static ssize_t format_iw_##name(const struct iw_statistics *iw, char *buf) \
 320 {                                                                       \
 321         return sprintf(buf, format_string, iw->field);                  \
 322 }                                                                       \
 323 static ssize_t show_iw_##name(struct class_device *cd, char *buf)       \
 324 {                                                                       \
 325         return wireless_show(cd, buf, format_iw_##name);                \
 326 }                                                                       \
 327 static CLASS_DEVICE_ATTR(name, S_IRUGO, show_iw_##name, NULL)
 328
 329 WIRELESS_SHOW(status, status, fmt_hex);
 330 WIRELESS_SHOW(link, qual.qual, fmt_dec);
 331 WIRELESS_SHOW(level, qual.level, fmt_dec);
 332 WIRELESS_SHOW(noise, qual.noise, fmt_dec);
 333 WIRELESS_SHOW(nwid, discard.nwid, fmt_dec);
 334 WIRELESS_SHOW(crypt, discard.code, fmt_dec);
 335 WIRELESS_SHOW(fragment, discard.fragment, fmt_dec);
 336 WIRELESS_SHOW(misc, discard.misc, fmt_dec);
 337 WIRELESS_SHOW(retries, discard.retries, fmt_dec);
 338 WIRELESS_SHOW(beacon, miss.beacon, fmt_dec);
 339
 340 static struct attribute *wireless_attrs[] = {
 341         &class_device_attr_status.attr,
 342         &class_device_attr_link.attr,
 343         &class_device_attr_level.attr,
 344         &class_device_attr_noise.attr,
 345         &class_device_attr_nwid.attr,
 346         &class_device_attr_crypt.attr,
 347         &class_device_attr_fragment.attr,
 348         &class_device_attr_retries.attr,
 349         &class_device_attr_misc.attr,
 350         &class_device_attr_beacon.attr,
 351         NULL
 352 };
 353
 354 static struct attribute_group wireless_group = {
 355         .name = "wireless",
 356         .attrs = wireless_attrs,
 357 };
 358 #endif
 359
 360 #ifdef CONFIG_HOTPLUG
 361 static int netdev_uevent(struct class_device *cd, char **envp,
 362                          int num_envp, char *buf, int size)
 363 {
 364         struct net_device *dev = to_net_dev(cd);
 365         int i = 0;
 366         int n;
 367
 368         /* pass interface to uevent. */
 369         envp[i++] = buf;
 370         n = snprintf(buf, size, "INTERFACE=%s", dev->name) + 1;
 371         buf += n;
 372         size -= n;
 373
 374         if ((size <= 0) || (i >= num_envp))
 375                 return -ENOMEM;
 376
 377         envp[i] = NULL;
 378         return 0;
 379 }
 380 #endif
 381
 382 /*
 383  *      netdev_release -- destroy and free a dead device.
 384  *      Called when last reference to class_device kobject is gone.
 385  */
 386 static void netdev_release(struct class_device *cd)
 387 {
 388         struct net_device *dev
 389                 = container_of(cd, struct net_device, class_dev);
 390
 391         BUG_ON(dev->reg_state != NETREG_RELEASED);
 392
 393         kfree((char *)dev - dev->padded);
 394 }
 395
 396 static struct class net_class = {
 397         .name = "net",
 398         .release = netdev_release,
 399         .class_dev_attrs = net_class_attributes,
 400 #ifdef CONFIG_HOTPLUG
 401         .uevent = netdev_uevent,
 402 #endif
 403 };
 404
 405 void netdev_unregister_sysfs(struct net_device * net)
 406 {
 407         struct class_device * class_dev = &(net->class_dev);
 408
 409         if (net->get_stats)
 410                 sysfs_remove_group(&class_dev->kobj, &netstat_group);
 411
 412 #ifdef WIRELESS_EXT
 413         if (net->get_wireless_stats || (net->wireless_handlers &&
 414                         net->wireless_handlers->get_wireless_stats))
 415                 sysfs_remove_group(&class_dev->kobj, &wireless_group);
 416 #endif
 417         class_device_del(class_dev);
 418
 419 }
 420
 421 /* Create sysfs entries for network device. */
 422 int netdev_register_sysfs(struct net_device *net)
 423 {
 424         struct class_device *class_dev = &(net->class_dev);
 425         int ret;
 426
 427         class_dev->class = &net_class;
 428         class_dev->class_data = net;
 429
 430         strlcpy(class_dev->class_id, net->name, BUS_ID_SIZE);
 431         if ((ret = class_device_register(class_dev)))
 432                 goto out;
 433
 434         if (net->get_stats &&
 435             (ret = sysfs_create_group(&class_dev->kobj, &netstat_group)))
 436                 goto out_unreg;
 437
 438 #ifdef WIRELESS_EXT
 439         if (net->get_wireless_stats || (net->wireless_handlers &&
 440                         net->wireless_handlers->get_wireless_stats)) {
 441                 ret = sysfs_create_group(&class_dev->kobj, &wireless_group);
 442                 if (ret)
 443                         goto out_cleanup;
 444         }
 445         return 0;
 446 out_cleanup:
 447         if (net->get_stats)
 448                 sysfs_remove_group(&class_dev->kobj, &netstat_group);
 449 #else
 450         return 0;
 451 #endif
 452
 453 out_unreg:
 454         printk(KERN_WARNING "%s: sysfs attribute registration failed %d\n",
 455                net->name, ret);
 456         class_device_unregister(class_dev);
 457 out:
 458         return ret;
 459 }
 460
 461 int netdev_sysfs_init(void)
 462 {
 463         return class_register(&net_class);
 464 }