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/config.h>
  13 #include <linux/kernel.h>
  14 #include <linux/netdevice.h>
  15 #include <linux/if_arp.h>
  16 #include <net/sock.h>
  17 #include <linux/rtnetlink.h>
  18 #include <linux/wireless.h>
  19
  20 #define to_class_dev(obj) container_of(obj,struct class_device,kobj)
  21 #define to_net_dev(class) container_of(class, struct net_device, class_dev)
  22
  23 static const char fmt_hex[] = "%#x\n";
  24 static const char fmt_long_hex[] = "%#lx\n";
  25 static const char fmt_dec[] = "%d\n";
  26 static const char fmt_ulong[] = "%lu\n";
  27
  28 static inline int dev_isalive(const struct net_device *dev)
  29 {
  30         return dev->reg_state == NETREG_REGISTERED;
  31 }
  32
  33 /* use same locking rules as GIF* ioctl's */
  34 static ssize_t netdev_show(const struct class_device *cd, char *buf,
  35                            ssize_t (*format)(const struct net_device *, char *))
  36 {
  37         struct net_device *net = to_net_dev(cd);
  38         ssize_t ret = -EINVAL;
  39
  40         read_lock(&dev_base_lock);
  41         if (dev_isalive(net))
  42                 ret = (*format)(net, buf);
  43         read_unlock(&dev_base_lock);
  44
  45         return ret;
  46 }
  47
  48 /* generate a show function for simple field */
  49 #define NETDEVICE_SHOW(field, format_string)                            \
  50 static ssize_t format_##field(const struct net_device *net, char *buf)  \
  51 {                                                                       \
  52         return sprintf(buf, format_string, net->field);                 \
  53 }                                                                       \
  54 static ssize_t show_##field(struct class_device *cd, char *buf)         \
  55 {                                                                       \
  56         return netdev_show(cd, buf, format_##field);                    \
  57 }
  58
  59
  60 /* use same locking and permission rules as SIF* ioctl's */
  61 static ssize_t netdev_store(struct class_device *dev,
  62                             const char *buf, size_t len,
  63                             int (*set)(struct net_device *, unsigned long))
  64 {
  65         struct net_device *net = to_net_dev(dev);
  66         char *endp;
  67         unsigned long new;
  68         int ret = -EINVAL;
  69
  70         if (!capable(CAP_NET_ADMIN))
  71                 return -EPERM;
  72
  73         new = simple_strtoul(buf, &endp, 0);
  74         if (endp == buf)
  75                 goto err;
  76
  77         rtnl_lock();
  78         if (dev_isalive(net)) {
  79                 if ((ret = (*set)(net, new)) == 0)
  80                         ret = len;
  81         }
  82         rtnl_unlock();
  83  err:
  84         return ret;
  85 }
  86
  87 /* generate a read-only network device class attribute */
  88 #define NETDEVICE_ATTR(field, format_string)                            \
  89 NETDEVICE_SHOW(field, format_string)                                    \
  90 static CLASS_DEVICE_ATTR(field, S_IRUGO, show_##field, NULL)            \
  91
  92 NETDEVICE_ATTR(addr_len, fmt_dec);
  93 NETDEVICE_ATTR(iflink, fmt_dec);
  94 NETDEVICE_ATTR(ifindex, fmt_dec);
  95 NETDEVICE_ATTR(features, fmt_long_hex);
  96 NETDEVICE_ATTR(type, fmt_dec);
  97
  98 /* use same locking rules as GIFHWADDR ioctl's */
  99 static ssize_t format_addr(char *buf, const unsigned char *addr, int len)
 100 {
 101         int i;
 102         char *cp = buf;
 103
 104         for (i = 0; i < len; i++)
 105                 cp += sprintf(cp, "%02x%c", addr[i],
 106                               i == (len - 1) ? '\n' : ':');
 107         return cp - buf;
 108 }
 109
 110 static ssize_t show_address(struct class_device *dev, char *buf)
 111 {
 112         struct net_device *net = to_net_dev(dev);
 113         ssize_t ret = -EINVAL;
 114
 115         read_lock(&dev_base_lock);
 116         if (dev_isalive(net))
 117             ret = format_addr(buf, net->dev_addr, net->addr_len);
 118         read_unlock(&dev_base_lock);
 119         return ret;
 120 }
 121
 122 static ssize_t show_broadcast(struct class_device *dev, char *buf)
 123 {
 124         struct net_device *net = to_net_dev(dev);
 125         if (dev_isalive(net))
 126                 return format_addr(buf, net->broadcast, net->addr_len);
 127         return -EINVAL;
 128 }
 129
 130 static ssize_t show_carrier(struct class_device *dev, char *buf)
 131 {
 132         struct net_device *netdev = to_net_dev(dev);
 133         if (netif_running(netdev)) {
 134                 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
 135         }
 136         return -EINVAL;
 137 }
 138
 139 static CLASS_DEVICE_ATTR(address, S_IRUGO, show_address, NULL);
 140 static CLASS_DEVICE_ATTR(broadcast, S_IRUGO, show_broadcast, NULL);
 141 static CLASS_DEVICE_ATTR(carrier, S_IRUGO, show_carrier, NULL);
 142
 143 /* read-write attributes */
 144 NETDEVICE_SHOW(mtu, fmt_dec);
 145
 146 static int change_mtu(struct net_device *net, unsigned long new_mtu)
 147 {
 148         return dev_set_mtu(net, (int) new_mtu);
 149 }
 150
 151 static ssize_t store_mtu(struct class_device *dev, const char *buf, size_t len)
 152 {
 153         return netdev_store(dev, buf, len, change_mtu);
 154 }
 155
 156 static CLASS_DEVICE_ATTR(mtu, S_IRUGO | S_IWUSR, show_mtu, store_mtu);
 157
 158 NETDEVICE_SHOW(flags, fmt_hex);
 159
 160 static int change_flags(struct net_device *net, unsigned long new_flags)
 161 {
 162         return dev_change_flags(net, (unsigned) new_flags);
 163 }
 164
 165 static ssize_t store_flags(struct class_device *dev, const char *buf, size_t len)
 166 {
 167         return netdev_store(dev, buf, len, change_flags);
 168 }
 169
 170 static CLASS_DEVICE_ATTR(flags, S_IRUGO | S_IWUSR, show_flags, store_flags);
 171
 172 NETDEVICE_SHOW(tx_queue_len, fmt_ulong);
 173
 174 static int change_tx_queue_len(struct net_device *net, unsigned long new_len)
 175 {
 176         net->tx_queue_len = new_len;
 177         return 0;
 178 }
 179
 180 static ssize_t store_tx_queue_len(struct class_device *dev, const char *buf, size_t len)
 181 {
 182         return netdev_store(dev, buf, len, change_tx_queue_len);
 183 }
 184
 185 static CLASS_DEVICE_ATTR(tx_queue_len, S_IRUGO | S_IWUSR, show_tx_queue_len,
 186                          store_tx_queue_len);
 187
 188 NETDEVICE_SHOW(weight, fmt_dec);
 189
 190 static int change_weight(struct net_device *net, unsigned long new_weight)
 191 {
 192         net->weight = new_weight;
 193         return 0;
 194 }
 195
 196 static ssize_t store_weight(struct class_device *dev, const char *buf, size_t len)
 197 {
 198         return netdev_store(dev, buf, len, change_weight);
 199 }
 200
 201 static CLASS_DEVICE_ATTR(weight, S_IRUGO | S_IWUSR, show_weight,
 202                          store_weight);
 203
 204
 205 static struct class_device_attribute *net_class_attributes[] = {
 206         &class_device_attr_ifindex,
 207         &class_device_attr_iflink,
 208         &class_device_attr_addr_len,
 209         &class_device_attr_tx_queue_len,
 210         &class_device_attr_features,
 211         &class_device_attr_mtu,
 212         &class_device_attr_flags,
 213         &class_device_attr_weight,
 214         &class_device_attr_type,
 215         &class_device_attr_address,
 216         &class_device_attr_broadcast,
 217         &class_device_attr_carrier,
 218         NULL
 219 };
 220
 221 /* Show a given an attribute in the statistics group */
 222 static ssize_t netstat_show(const struct class_device *cd, char *buf,
 223                             unsigned long offset)
 224 {
 225         struct net_device *dev = to_net_dev(cd);
 226         struct net_device_stats *stats;
 227         ssize_t ret = -EINVAL;
 228
 229         if (offset > sizeof(struct net_device_stats) ||
 230             offset % sizeof(unsigned long) != 0)
 231                 WARN_ON(1);
 232
 233         read_lock(&dev_base_lock);
 234         if (dev_isalive(dev) && dev->get_stats &&
 235             (stats = (*dev->get_stats)(dev)))
 236                 ret = sprintf(buf, fmt_ulong,
 237                               *(unsigned long *)(((u8 *) stats) + offset));
 238
 239         read_unlock(&dev_base_lock);
 240         return ret;
 241 }
 242
 243 /* generate a read-only statistics attribute */
 244 #define NETSTAT_ENTRY(name)                                             \
 245 static ssize_t show_##name(struct class_device *cd, char *buf)          \
 246 {                                                                       \
 247         return netstat_show(cd, buf,                                    \
 248                             offsetof(struct net_device_stats, name));   \
 249 }                                                                       \
 250 static CLASS_DEVICE_ATTR(name, S_IRUGO, show_##name, NULL)
 251
 252 NETSTAT_ENTRY(rx_packets);
 253 NETSTAT_ENTRY(tx_packets);
 254 NETSTAT_ENTRY(rx_bytes);
 255 NETSTAT_ENTRY(tx_bytes);
 256 NETSTAT_ENTRY(rx_errors);
 257 NETSTAT_ENTRY(tx_errors);
 258 NETSTAT_ENTRY(rx_dropped);
 259 NETSTAT_ENTRY(tx_dropped);
 260 NETSTAT_ENTRY(multicast);
 261 NETSTAT_ENTRY(collisions);
 262 NETSTAT_ENTRY(rx_length_errors);
 263 NETSTAT_ENTRY(rx_over_errors);
 264 NETSTAT_ENTRY(rx_crc_errors);
 265 NETSTAT_ENTRY(rx_frame_errors);
 266 NETSTAT_ENTRY(rx_fifo_errors);
 267 NETSTAT_ENTRY(rx_missed_errors);
 268 NETSTAT_ENTRY(tx_aborted_errors);
 269 NETSTAT_ENTRY(tx_carrier_errors);
 270 NETSTAT_ENTRY(tx_fifo_errors);
 271 NETSTAT_ENTRY(tx_heartbeat_errors);
 272 NETSTAT_ENTRY(tx_window_errors);
 273 NETSTAT_ENTRY(rx_compressed);
 274 NETSTAT_ENTRY(tx_compressed);
 275
 276 static struct attribute *netstat_attrs[] = {
 277         &class_device_attr_rx_packets.attr,
 278         &class_device_attr_tx_packets.attr,
 279         &class_device_attr_rx_bytes.attr,
 280         &class_device_attr_tx_bytes.attr,
 281         &class_device_attr_rx_errors.attr,
 282         &class_device_attr_tx_errors.attr,
 283         &class_device_attr_rx_dropped.attr,
 284         &class_device_attr_tx_dropped.attr,
 285         &class_device_attr_multicast.attr,
 286         &class_device_attr_collisions.attr,
 287         &class_device_attr_rx_length_errors.attr,
 288         &class_device_attr_rx_over_errors.attr,
 289         &class_device_attr_rx_crc_errors.attr,
 290         &class_device_attr_rx_frame_errors.attr,
 291         &class_device_attr_rx_fifo_errors.attr,
 292         &class_device_attr_rx_missed_errors.attr,
 293         &class_device_attr_tx_aborted_errors.attr,
 294         &class_device_attr_tx_carrier_errors.attr,
 295         &class_device_attr_tx_fifo_errors.attr,
 296         &class_device_attr_tx_heartbeat_errors.attr,
 297         &class_device_attr_tx_window_errors.attr,
 298         &class_device_attr_rx_compressed.attr,
 299         &class_device_attr_tx_compressed.attr,
 300         NULL
 301 };
 302
 303
 304 static struct attribute_group netstat_group = {
 305         .name  = "statistics",
 306         .attrs  = netstat_attrs,
 307 };
 308
 309 #ifdef WIRELESS_EXT
 310 /* helper function that does all the locking etc for wireless stats */
 311 static ssize_t wireless_show(struct class_device *cd, char *buf,
 312                              ssize_t (*format)(const struct iw_statistics *,
 313                                                char *))
 314 {
 315         struct net_device *dev = to_net_dev(cd);
 316         const struct iw_statistics *iw;
 317         ssize_t ret = -EINVAL;
 318
 319         read_lock(&dev_base_lock);
 320         if (dev_isalive(dev) && dev->get_wireless_stats
 321             && (iw = dev->get_wireless_stats(dev)) != NULL)
 322                 ret = (*format)(iw, buf);
 323         read_unlock(&dev_base_lock);
 324
 325         return ret;
 326 }
 327
 328 /* show function template for wireless fields */
 329 #define WIRELESS_SHOW(name, field, format_string)                       \
 330 static ssize_t format_iw_##name(const struct iw_statistics *iw, char *buf) \
 331 {                                                                       \
 332         return sprintf(buf, format_string, iw->field);                  \
 333 }                                                                       \
 334 static ssize_t show_iw_##name(struct class_device *cd, char *buf)       \
 335 {                                                                       \
 336         return wireless_show(cd, buf, format_iw_##name);                \
 337 }                                                                       \
 338 static CLASS_DEVICE_ATTR(name, S_IRUGO, show_iw_##name, NULL)
 339
 340 WIRELESS_SHOW(status, status, fmt_hex);
 341 WIRELESS_SHOW(link, qual.qual, fmt_dec);
 342 WIRELESS_SHOW(level, qual.level, fmt_dec);
 343 WIRELESS_SHOW(noise, qual.noise, fmt_dec);
 344 WIRELESS_SHOW(nwid, discard.nwid, fmt_dec);
 345 WIRELESS_SHOW(crypt, discard.code, fmt_dec);
 346 WIRELESS_SHOW(fragment, discard.fragment, fmt_dec);
 347 WIRELESS_SHOW(misc, discard.misc, fmt_dec);
 348 WIRELESS_SHOW(retries, discard.retries, fmt_dec);
 349 WIRELESS_SHOW(beacon, miss.beacon, fmt_dec);
 350
 351 static struct attribute *wireless_attrs[] = {
 352         &class_device_attr_status.attr,
 353         &class_device_attr_link.attr,
 354         &class_device_attr_level.attr,
 355         &class_device_attr_noise.attr,
 356         &class_device_attr_nwid.attr,
 357         &class_device_attr_crypt.attr,
 358         &class_device_attr_fragment.attr,
 359         &class_device_attr_retries.attr,
 360         &class_device_attr_misc.attr,
 361         &class_device_attr_beacon.attr,
 362         NULL
 363 };
 364
 365 static struct attribute_group wireless_group = {
 366         .name = "wireless",
 367         .attrs = wireless_attrs,
 368 };
 369 #endif
 370
 371 #ifdef CONFIG_HOTPLUG
 372 static int netdev_hotplug(struct class_device *cd, char **envp,
 373                           int num_envp, char *buf, int size)
 374 {
 375         struct net_device *dev = to_net_dev(cd);
 376         int i = 0;
 377         int n;
 378
 379         /* pass interface in env to hotplug. */
 380         envp[i++] = buf;
 381         n = snprintf(buf, size, "INTERFACE=%s", dev->name) + 1;
 382         buf += n;
 383         size -= n;
 384
 385         if ((size <= 0) || (i >= num_envp))
 386                 return -ENOMEM;
 387
 388         envp[i] = NULL;
 389         return 0;
 390 }
 391 #endif
 392
 393 /*
 394  *      netdev_release -- destroy and free a dead device.
 395  *      Called when last reference to class_device kobject is gone.
 396  */
 397 static void netdev_release(struct class_device *cd)
 398 {
 399         struct net_device *dev
 400                 = container_of(cd, struct net_device, class_dev);
 401
 402         BUG_ON(dev->reg_state != NETREG_RELEASED);
 403
 404         kfree((char *)dev - dev->padded);
 405 }
 406
 407 static struct class net_class = {
 408         .name = "net",
 409         .release = netdev_release,
 410 #ifdef CONFIG_HOTPLUG
 411         .hotplug = netdev_hotplug,
 412 #endif
 413 };
 414
 415 void netdev_unregister_sysfs(struct net_device * net)
 416 {
 417         struct class_device * class_dev = &(net->class_dev);
 418
 419         if (net->get_stats)
 420                 sysfs_remove_group(&class_dev->kobj, &netstat_group);
 421
 422 #ifdef WIRELESS_EXT
 423         if (net->get_wireless_stats)
 424                 sysfs_remove_group(&class_dev->kobj, &wireless_group);
 425 #endif
 426         class_device_del(class_dev);
 427
 428 }
 429
 430 /* Create sysfs entries for network device. */
 431 int netdev_register_sysfs(struct net_device *net)
 432 {
 433         struct class_device *class_dev = &(net->class_dev);
 434         int i;
 435         struct class_device_attribute *attr;
 436         int ret;
 437
 438         class_dev->class = &net_class;
 439         class_dev->class_data = net;
 440
 441         strlcpy(class_dev->class_id, net->name, BUS_ID_SIZE);
 442         if ((ret = class_device_register(class_dev)))
 443                 goto out;
 444
 445         for (i = 0; (attr = net_class_attributes[i]) != NULL; i++) {
 446                 if ((ret = class_device_create_file(class_dev, attr)))
 447                     goto out_unreg;
 448         }
 449
 450
 451         if (net->get_stats &&
 452             (ret = sysfs_create_group(&class_dev->kobj, &netstat_group)))
 453                 goto out_unreg;
 454
 455 #ifdef WIRELESS_EXT
 456         if (net->get_wireless_stats &&
 457             (ret = sysfs_create_group(&class_dev->kobj, &wireless_group)))
 458                 goto out_cleanup;
 459
 460         return 0;
 461 out_cleanup:
 462         if (net->get_stats)
 463                 sysfs_remove_group(&class_dev->kobj, &netstat_group);
 464 #else
 465         return 0;
 466 #endif
 467
 468 out_unreg:
 469         printk(KERN_WARNING "%s: sysfs attribute registration failed %d\n",
 470                net->name, ret);
 471         class_device_unregister(class_dev);
 472 out:
 473         return ret;
 474 }
 475
 476 int netdev_sysfs_init(void)
 477 {
 478         return class_register(&net_class);
 479 }