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 NETDEVICE_SHOW(link_mode, fmt_dec);
  95
  96 /* use same locking rules as GIFHWADDR ioctl's */
  97 static ssize_t format_addr(char *buf, const unsigned char *addr, int len)
  98 {
  99         int i;
 100         char *cp = buf;
 101
 102         for (i = 0; i < len; i++)
 103                 cp += sprintf(cp, "%02x%c", addr[i],
 104                               i == (len - 1) ? '\n' : ':');
 105         return cp - buf;
 106 }
 107
 108 static ssize_t show_address(struct class_device *dev, char *buf)
 109 {
 110         struct net_device *net = to_net_dev(dev);
 111         ssize_t ret = -EINVAL;
 112
 113         read_lock(&dev_base_lock);
 114         if (dev_isalive(net))
 115             ret = format_addr(buf, net->dev_addr, net->addr_len);
 116         read_unlock(&dev_base_lock);
 117         return ret;
 118 }
 119
 120 static ssize_t show_broadcast(struct class_device *dev, char *buf)
 121 {
 122         struct net_device *net = to_net_dev(dev);
 123         if (dev_isalive(net))
 124                 return format_addr(buf, net->broadcast, net->addr_len);
 125         return -EINVAL;
 126 }
 127
 128 static ssize_t show_carrier(struct class_device *dev, char *buf)
 129 {
 130         struct net_device *netdev = to_net_dev(dev);
 131         if (netif_running(netdev)) {
 132                 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
 133         }
 134         return -EINVAL;
 135 }
 136
 137 static ssize_t show_dormant(struct class_device *dev, char *buf)
 138 {
 139         struct net_device *netdev = to_net_dev(dev);
 140
 141         if (netif_running(netdev))
 142                 return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
 143
 144         return -EINVAL;
 145 }
 146
 147 static const char *operstates[] = {
 148         "unknown",
 149         "notpresent", /* currently unused */
 150         "down",
 151         "lowerlayerdown",
 152         "testing", /* currently unused */
 153         "dormant",
 154         "up"
 155 };
 156
 157 static ssize_t show_operstate(struct class_device *dev, char *buf)
 158 {
 159         const struct net_device *netdev = to_net_dev(dev);
 160         unsigned char operstate;
 161
 162         read_lock(&dev_base_lock);
 163         operstate = netdev->operstate;
 164         if (!netif_running(netdev))
 165                 operstate = IF_OPER_DOWN;
 166         read_unlock(&dev_base_lock);
 167
 168         if (operstate >= ARRAY_SIZE(operstates))
 169                 return -EINVAL; /* should not happen */
 170
 171         return sprintf(buf, "%s\n", operstates[operstate]);
 172 }
 173
 174 /* read-write attributes */
 175 NETDEVICE_SHOW(mtu, fmt_dec);
 176
 177 static int change_mtu(struct net_device *net, unsigned long new_mtu)
 178 {
 179         return dev_set_mtu(net, (int) new_mtu);
 180 }
 181
 182 static ssize_t store_mtu(struct class_device *dev, const char *buf, size_t len)
 183 {
 184         return netdev_store(dev, buf, len, change_mtu);
 185 }
 186
 187 NETDEVICE_SHOW(flags, fmt_hex);
 188
 189 static int change_flags(struct net_device *net, unsigned long new_flags)
 190 {
 191         return dev_change_flags(net, (unsigned) new_flags);
 192 }
 193
 194 static ssize_t store_flags(struct class_device *dev, const char *buf, size_t len)
 195 {
 196         return netdev_store(dev, buf, len, change_flags);
 197 }
 198
 199 NETDEVICE_SHOW(tx_queue_len, fmt_ulong);
 200
 201 static int change_tx_queue_len(struct net_device *net, unsigned long new_len)
 202 {
 203         net->tx_queue_len = new_len;
 204         return 0;
 205 }
 206
 207 static ssize_t store_tx_queue_len(struct class_device *dev, const char *buf, size_t len)
 208 {
 209         return netdev_store(dev, buf, len, change_tx_queue_len);
 210 }
 211
 212 NETDEVICE_SHOW(weight, fmt_dec);
 213
 214 static int change_weight(struct net_device *net, unsigned long new_weight)
 215 {
 216         net->weight = new_weight;
 217         return 0;
 218 }
 219
 220 static ssize_t store_weight(struct class_device *dev, const char *buf, size_t len)
 221 {
 222         return netdev_store(dev, buf, len, change_weight);
 223 }
 224
 225 static struct class_device_attribute net_class_attributes[] = {
 226         __ATTR(addr_len, S_IRUGO, show_addr_len, NULL),
 227         __ATTR(iflink, S_IRUGO, show_iflink, NULL),
 228         __ATTR(ifindex, S_IRUGO, show_ifindex, NULL),
 229         __ATTR(features, S_IRUGO, show_features, NULL),
 230         __ATTR(type, S_IRUGO, show_type, NULL),
 231         __ATTR(link_mode, S_IRUGO, show_link_mode, NULL),
 232         __ATTR(address, S_IRUGO, show_address, NULL),
 233         __ATTR(broadcast, S_IRUGO, show_broadcast, NULL),
 234         __ATTR(carrier, S_IRUGO, show_carrier, NULL),
 235         __ATTR(dormant, S_IRUGO, show_dormant, NULL),
 236         __ATTR(operstate, S_IRUGO, show_operstate, NULL),
 237         __ATTR(mtu, S_IRUGO | S_IWUSR, show_mtu, store_mtu),
 238         __ATTR(flags, S_IRUGO | S_IWUSR, show_flags, store_flags),
 239         __ATTR(tx_queue_len, S_IRUGO | S_IWUSR, show_tx_queue_len,
 240                store_tx_queue_len),
 241         __ATTR(weight, S_IRUGO | S_IWUSR, show_weight, store_weight),
 242         {}
 243 };
 244
 245 /* Show a given an attribute in the statistics group */
 246 static ssize_t netstat_show(const struct class_device *cd, char *buf,
 247                             unsigned long offset)
 248 {
 249         struct net_device *dev = to_net_dev(cd);
 250         struct net_device_stats *stats;
 251         ssize_t ret = -EINVAL;
 252
 253         if (offset > sizeof(struct net_device_stats) ||
 254             offset % sizeof(unsigned long) != 0)
 255                 WARN_ON(1);
 256
 257         read_lock(&dev_base_lock);
 258         if (dev_isalive(dev) && dev->get_stats &&
 259             (stats = (*dev->get_stats)(dev)))
 260                 ret = sprintf(buf, fmt_ulong,
 261                               *(unsigned long *)(((u8 *) stats) + offset));
 262
 263         read_unlock(&dev_base_lock);
 264         return ret;
 265 }
 266
 267 /* generate a read-only statistics attribute */
 268 #define NETSTAT_ENTRY(name)                                             \
 269 static ssize_t show_##name(struct class_device *cd, char *buf)          \
 270 {                                                                       \
 271         return netstat_show(cd, buf,                                    \
 272                             offsetof(struct net_device_stats, name));   \
 273 }                                                                       \
 274 static CLASS_DEVICE_ATTR(name, S_IRUGO, show_##name, NULL)
 275
 276 NETSTAT_ENTRY(rx_packets);
 277 NETSTAT_ENTRY(tx_packets);
 278 NETSTAT_ENTRY(rx_bytes);
 279 NETSTAT_ENTRY(tx_bytes);
 280 NETSTAT_ENTRY(rx_errors);
 281 NETSTAT_ENTRY(tx_errors);
 282 NETSTAT_ENTRY(rx_dropped);
 283 NETSTAT_ENTRY(tx_dropped);
 284 NETSTAT_ENTRY(multicast);
 285 NETSTAT_ENTRY(collisions);
 286 NETSTAT_ENTRY(rx_length_errors);
 287 NETSTAT_ENTRY(rx_over_errors);
 288 NETSTAT_ENTRY(rx_crc_errors);
 289 NETSTAT_ENTRY(rx_frame_errors);
 290 NETSTAT_ENTRY(rx_fifo_errors);
 291 NETSTAT_ENTRY(rx_missed_errors);
 292 NETSTAT_ENTRY(tx_aborted_errors);
 293 NETSTAT_ENTRY(tx_carrier_errors);
 294 NETSTAT_ENTRY(tx_fifo_errors);
 295 NETSTAT_ENTRY(tx_heartbeat_errors);
 296 NETSTAT_ENTRY(tx_window_errors);
 297 NETSTAT_ENTRY(rx_compressed);
 298 NETSTAT_ENTRY(tx_compressed);
 299
 300 static struct attribute *netstat_attrs[] = {
 301         &class_device_attr_rx_packets.attr,
 302         &class_device_attr_tx_packets.attr,
 303         &class_device_attr_rx_bytes.attr,
 304         &class_device_attr_tx_bytes.attr,
 305         &class_device_attr_rx_errors.attr,
 306         &class_device_attr_tx_errors.attr,
 307         &class_device_attr_rx_dropped.attr,
 308         &class_device_attr_tx_dropped.attr,
 309         &class_device_attr_multicast.attr,
 310         &class_device_attr_collisions.attr,
 311         &class_device_attr_rx_length_errors.attr,
 312         &class_device_attr_rx_over_errors.attr,
 313         &class_device_attr_rx_crc_errors.attr,
 314         &class_device_attr_rx_frame_errors.attr,
 315         &class_device_attr_rx_fifo_errors.attr,
 316         &class_device_attr_rx_missed_errors.attr,
 317         &class_device_attr_tx_aborted_errors.attr,
 318         &class_device_attr_tx_carrier_errors.attr,
 319         &class_device_attr_tx_fifo_errors.attr,
 320         &class_device_attr_tx_heartbeat_errors.attr,
 321         &class_device_attr_tx_window_errors.attr,
 322         &class_device_attr_rx_compressed.attr,
 323         &class_device_attr_tx_compressed.attr,
 324         NULL
 325 };
 326
 327
 328 static struct attribute_group netstat_group = {
 329         .name  = "statistics",
 330         .attrs  = netstat_attrs,
 331 };
 332
 333 #ifdef WIRELESS_EXT
 334 /* helper function that does all the locking etc for wireless stats */
 335 static ssize_t wireless_show(struct class_device *cd, char *buf,
 336                              ssize_t (*format)(const struct iw_statistics *,
 337                                                char *))
 338 {
 339         struct net_device *dev = to_net_dev(cd);
 340         const struct iw_statistics *iw = NULL;
 341         ssize_t ret = -EINVAL;
 342
 343         read_lock(&dev_base_lock);
 344         if (dev_isalive(dev)) {
 345                 if(dev->wireless_handlers &&
 346                    dev->wireless_handlers->get_wireless_stats)
 347                         iw = dev->wireless_handlers->get_wireless_stats(dev);
 348                 else if (dev->get_wireless_stats)
 349                         iw = dev->get_wireless_stats(dev);
 350                 if (iw != NULL)
 351                         ret = (*format)(iw, buf);
 352         }
 353         read_unlock(&dev_base_lock);
 354
 355         return ret;
 356 }
 357
 358 /* show function template for wireless fields */
 359 #define WIRELESS_SHOW(name, field, format_string)                       \
 360 static ssize_t format_iw_##name(const struct iw_statistics *iw, char *buf) \
 361 {                                                                       \
 362         return sprintf(buf, format_string, iw->field);                  \
 363 }                                                                       \
 364 static ssize_t show_iw_##name(struct class_device *cd, char *buf)       \
 365 {                                                                       \
 366         return wireless_show(cd, buf, format_iw_##name);                \
 367 }                                                                       \
 368 static CLASS_DEVICE_ATTR(name, S_IRUGO, show_iw_##name, NULL)
 369
 370 WIRELESS_SHOW(status, status, fmt_hex);
 371 WIRELESS_SHOW(link, qual.qual, fmt_dec);
 372 WIRELESS_SHOW(level, qual.level, fmt_dec);
 373 WIRELESS_SHOW(noise, qual.noise, fmt_dec);
 374 WIRELESS_SHOW(nwid, discard.nwid, fmt_dec);
 375 WIRELESS_SHOW(crypt, discard.code, fmt_dec);
 376 WIRELESS_SHOW(fragment, discard.fragment, fmt_dec);
 377 WIRELESS_SHOW(misc, discard.misc, fmt_dec);
 378 WIRELESS_SHOW(retries, discard.retries, fmt_dec);
 379 WIRELESS_SHOW(beacon, miss.beacon, fmt_dec);
 380
 381 static struct attribute *wireless_attrs[] = {
 382         &class_device_attr_status.attr,
 383         &class_device_attr_link.attr,
 384         &class_device_attr_level.attr,
 385         &class_device_attr_noise.attr,
 386         &class_device_attr_nwid.attr,
 387         &class_device_attr_crypt.attr,
 388         &class_device_attr_fragment.attr,
 389         &class_device_attr_retries.attr,
 390         &class_device_attr_misc.attr,
 391         &class_device_attr_beacon.attr,
 392         NULL
 393 };
 394
 395 static struct attribute_group wireless_group = {
 396         .name = "wireless",
 397         .attrs = wireless_attrs,
 398 };
 399 #endif
 400
 401 #ifdef CONFIG_HOTPLUG
 402 static int netdev_uevent(struct class_device *cd, char **envp,
 403                          int num_envp, char *buf, int size)
 404 {
 405         struct net_device *dev = to_net_dev(cd);
 406         int i = 0;
 407         int n;
 408
 409         /* pass interface to uevent. */
 410         envp[i++] = buf;
 411         n = snprintf(buf, size, "INTERFACE=%s", dev->name) + 1;
 412         buf += n;
 413         size -= n;
 414
 415         if ((size <= 0) || (i >= num_envp))
 416                 return -ENOMEM;
 417
 418         envp[i] = NULL;
 419         return 0;
 420 }
 421 #endif
 422
 423 /*
 424  *      netdev_release -- destroy and free a dead device.
 425  *      Called when last reference to class_device kobject is gone.
 426  */
 427 static void netdev_release(struct class_device *cd)
 428 {
 429         struct net_device *dev
 430                 = container_of(cd, struct net_device, class_dev);
 431
 432         BUG_ON(dev->reg_state != NETREG_RELEASED);
 433
 434         kfree((char *)dev - dev->padded);
 435 }
 436
 437 static struct class net_class = {
 438         .name = "net",
 439         .release = netdev_release,
 440         .class_dev_attrs = net_class_attributes,
 441 #ifdef CONFIG_HOTPLUG
 442         .uevent = netdev_uevent,
 443 #endif
 444 };
 445
 446 void netdev_unregister_sysfs(struct net_device * net)
 447 {
 448         class_device_del(&(net->class_dev));
 449 }
 450
 451 /* Create sysfs entries for network device. */
 452 int netdev_register_sysfs(struct net_device *net)
 453 {
 454         struct class_device *class_dev = &(net->class_dev);
 455         struct attribute_group **groups = net->sysfs_groups;
 456
 457         class_device_initialize(class_dev);
 458         class_dev->class = &net_class;
 459         class_dev->class_data = net;
 460         class_dev->groups = groups;
 461
 462         BUILD_BUG_ON(BUS_ID_SIZE < IFNAMSIZ);
 463         strlcpy(class_dev->class_id, net->name, BUS_ID_SIZE);
 464
 465         if (net->get_stats)
 466                 *groups++ = &netstat_group;
 467
 468 #ifdef WIRELESS_EXT
 469         if (net->get_wireless_stats
 470             || (net->wireless_handlers && net->wireless_handlers->get_wireless_stats))
 471                 *groups++ = &wireless_group;
 472 #endif
 473
 474         return class_device_add(class_dev);
 475 }
 476
 477 int netdev_sysfs_init(void)
 478 {
 479         return class_register(&net_class);
 480 }