kernel/net/batman-adv/debugfs.c

   1 /* Copyright (C) 2010-2014 B.A.T.M.A.N. contributors:
   2  *
   3  * Marek Lindner
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of version 2 of the GNU General Public
   7  * License as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include "main.h"
  19
  20 #include <linux/debugfs.h>
  21
  22 #include "debugfs.h"
  23 #include "translation-table.h"
  24 #include "originator.h"
  25 #include "hard-interface.h"
  26 #include "gateway_common.h"
  27 #include "gateway_client.h"
  28 #include "soft-interface.h"
  29 #include "icmp_socket.h"
  30 #include "bridge_loop_avoidance.h"
  31 #include "distributed-arp-table.h"
  32 #include "network-coding.h"
  33
  34 static struct dentry *batadv_debugfs;
  35
  36 #ifdef CONFIG_BATMAN_ADV_DEBUG
  37 #define BATADV_LOG_BUFF_MASK (batadv_log_buff_len - 1)
  38
  39 static const int batadv_log_buff_len = BATADV_LOG_BUF_LEN;
  40
  41 static char *batadv_log_char_addr(struct batadv_priv_debug_log *debug_log,
  42                                   size_t idx)
  43 {
  44         return &debug_log->log_buff[idx & BATADV_LOG_BUFF_MASK];
  45 }
  46
  47 static void batadv_emit_log_char(struct batadv_priv_debug_log *debug_log,
  48                                  char c)
  49 {
  50         char *char_addr;
  51
  52         char_addr = batadv_log_char_addr(debug_log, debug_log->log_end);
  53         *char_addr = c;
  54         debug_log->log_end++;
  55
  56         if (debug_log->log_end - debug_log->log_start > batadv_log_buff_len)
  57                 debug_log->log_start = debug_log->log_end - batadv_log_buff_len;
  58 }
  59
  60 __printf(2, 3)
  61 static int batadv_fdebug_log(struct batadv_priv_debug_log *debug_log,
  62                              const char *fmt, ...)
  63 {
  64         va_list args;
  65         static char debug_log_buf[256];
  66         char *p;
  67
  68         if (!debug_log)
  69                 return 0;
  70
  71         spin_lock_bh(&debug_log->lock);
  72         va_start(args, fmt);
  73         vscnprintf(debug_log_buf, sizeof(debug_log_buf), fmt, args);
  74         va_end(args);
  75
  76         for (p = debug_log_buf; *p != 0; p++)
  77                 batadv_emit_log_char(debug_log, *p);
  78
  79         spin_unlock_bh(&debug_log->lock);
  80
  81         wake_up(&debug_log->queue_wait);
  82
  83         return 0;
  84 }
  85
  86 int batadv_debug_log(struct batadv_priv *bat_priv, const char *fmt, ...)
  87 {
  88         va_list args;
  89         char tmp_log_buf[256];
  90
  91         va_start(args, fmt);
  92         vscnprintf(tmp_log_buf, sizeof(tmp_log_buf), fmt, args);
  93         batadv_fdebug_log(bat_priv->debug_log, "[%10u] %s",
  94                           jiffies_to_msecs(jiffies), tmp_log_buf);
  95         va_end(args);
  96
  97         return 0;
  98 }
  99
 100 static int batadv_log_open(struct inode *inode, struct file *file)
 101 {
 102         if (!try_module_get(THIS_MODULE))
 103                 return -EBUSY;
 104
 105         nonseekable_open(inode, file);
 106         file->private_data = inode->i_private;
 107         return 0;
 108 }
 109
 110 static int batadv_log_release(struct inode *inode, struct file *file)
 111 {
 112         module_put(THIS_MODULE);
 113         return 0;
 114 }
 115
 116 static int batadv_log_empty(struct batadv_priv_debug_log *debug_log)
 117 {
 118         return !(debug_log->log_start - debug_log->log_end);
 119 }
 120
 121 static ssize_t batadv_log_read(struct file *file, char __user *buf,
 122                                size_t count, loff_t *ppos)
 123 {
 124         struct batadv_priv *bat_priv = file->private_data;
 125         struct batadv_priv_debug_log *debug_log = bat_priv->debug_log;
 126         int error, i = 0;
 127         char *char_addr;
 128         char c;
 129
 130         if ((file->f_flags & O_NONBLOCK) && batadv_log_empty(debug_log))
 131                 return -EAGAIN;
 132
 133         if (!buf)
 134                 return -EINVAL;
 135
 136         if (count == 0)
 137                 return 0;
 138
 139         if (!access_ok(VERIFY_WRITE, buf, count))
 140                 return -EFAULT;
 141
 142         error = wait_event_interruptible(debug_log->queue_wait,
 143                                          (!batadv_log_empty(debug_log)));
 144
 145         if (error)
 146                 return error;
 147
 148         spin_lock_bh(&debug_log->lock);
 149
 150         while ((!error) && (i < count) &&
 151                (debug_log->log_start != debug_log->log_end)) {
 152                 char_addr = batadv_log_char_addr(debug_log,
 153                                                  debug_log->log_start);
 154                 c = *char_addr;
 155
 156                 debug_log->log_start++;
 157
 158                 spin_unlock_bh(&debug_log->lock);
 159
 160                 error = __put_user(c, buf);
 161
 162                 spin_lock_bh(&debug_log->lock);
 163
 164                 buf++;
 165                 i++;
 166         }
 167
 168         spin_unlock_bh(&debug_log->lock);
 169
 170         if (!error)
 171                 return i;
 172
 173         return error;
 174 }
 175
 176 static unsigned int batadv_log_poll(struct file *file, poll_table *wait)
 177 {
 178         struct batadv_priv *bat_priv = file->private_data;
 179         struct batadv_priv_debug_log *debug_log = bat_priv->debug_log;
 180
 181         poll_wait(file, &debug_log->queue_wait, wait);
 182
 183         if (!batadv_log_empty(debug_log))
 184                 return POLLIN | POLLRDNORM;
 185
 186         return 0;
 187 }
 188
 189 static const struct file_operations batadv_log_fops = {
 190         .open           = batadv_log_open,
 191         .release        = batadv_log_release,
 192         .read           = batadv_log_read,
 193         .poll           = batadv_log_poll,
 194         .llseek         = no_llseek,
 195 };
 196
 197 static int batadv_debug_log_setup(struct batadv_priv *bat_priv)
 198 {
 199         struct dentry *d;
 200
 201         if (!bat_priv->debug_dir)
 202                 goto err;
 203
 204         bat_priv->debug_log = kzalloc(sizeof(*bat_priv->debug_log), GFP_ATOMIC);
 205         if (!bat_priv->debug_log)
 206                 goto err;
 207
 208         spin_lock_init(&bat_priv->debug_log->lock);
 209         init_waitqueue_head(&bat_priv->debug_log->queue_wait);
 210
 211         d = debugfs_create_file("log", S_IFREG | S_IRUSR,
 212                                 bat_priv->debug_dir, bat_priv,
 213                                 &batadv_log_fops);
 214         if (!d)
 215                 goto err;
 216
 217         return 0;
 218
 219 err:
 220         return -ENOMEM;
 221 }
 222
 223 static void batadv_debug_log_cleanup(struct batadv_priv *bat_priv)
 224 {
 225         kfree(bat_priv->debug_log);
 226         bat_priv->debug_log = NULL;
 227 }
 228 #else /* CONFIG_BATMAN_ADV_DEBUG */
 229 static int batadv_debug_log_setup(struct batadv_priv *bat_priv)
 230 {
 231         return 0;
 232 }
 233
 234 static void batadv_debug_log_cleanup(struct batadv_priv *bat_priv)
 235 {
 236 }
 237 #endif
 238
 239 static int batadv_algorithms_open(struct inode *inode, struct file *file)
 240 {
 241         return single_open(file, batadv_algo_seq_print_text, NULL);
 242 }
 243
 244 static int batadv_originators_open(struct inode *inode, struct file *file)
 245 {
 246         struct net_device *net_dev = (struct net_device *)inode->i_private;
 247
 248         return single_open(file, batadv_orig_seq_print_text, net_dev);
 249 }
 250
 251 /**
 252  * batadv_originators_hardif_open - handles debugfs output for the
 253  *  originator table of an hard interface
 254  * @inode: inode pointer to debugfs file
 255  * @file: pointer to the seq_file
 256  */
 257 static int batadv_originators_hardif_open(struct inode *inode,
 258                                           struct file *file)
 259 {
 260         struct net_device *net_dev = (struct net_device *)inode->i_private;
 261
 262         return single_open(file, batadv_orig_hardif_seq_print_text, net_dev);
 263 }
 264
 265 static int batadv_gateways_open(struct inode *inode, struct file *file)
 266 {
 267         struct net_device *net_dev = (struct net_device *)inode->i_private;
 268
 269         return single_open(file, batadv_gw_client_seq_print_text, net_dev);
 270 }
 271
 272 static int batadv_transtable_global_open(struct inode *inode, struct file *file)
 273 {
 274         struct net_device *net_dev = (struct net_device *)inode->i_private;
 275
 276         return single_open(file, batadv_tt_global_seq_print_text, net_dev);
 277 }
 278
 279 #ifdef CONFIG_BATMAN_ADV_BLA
 280 static int batadv_bla_claim_table_open(struct inode *inode, struct file *file)
 281 {
 282         struct net_device *net_dev = (struct net_device *)inode->i_private;
 283
 284         return single_open(file, batadv_bla_claim_table_seq_print_text,
 285                            net_dev);
 286 }
 287
 288 static int batadv_bla_backbone_table_open(struct inode *inode,
 289                                           struct file *file)
 290 {
 291         struct net_device *net_dev = (struct net_device *)inode->i_private;
 292
 293         return single_open(file, batadv_bla_backbone_table_seq_print_text,
 294                            net_dev);
 295 }
 296
 297 #endif
 298
 299 #ifdef CONFIG_BATMAN_ADV_DAT
 300 /**
 301  * batadv_dat_cache_open - Prepare file handler for reads from dat_chache
 302  * @inode: inode which was opened
 303  * @file: file handle to be initialized
 304  */
 305 static int batadv_dat_cache_open(struct inode *inode, struct file *file)
 306 {
 307         struct net_device *net_dev = (struct net_device *)inode->i_private;
 308
 309         return single_open(file, batadv_dat_cache_seq_print_text, net_dev);
 310 }
 311 #endif
 312
 313 static int batadv_transtable_local_open(struct inode *inode, struct file *file)
 314 {
 315         struct net_device *net_dev = (struct net_device *)inode->i_private;
 316
 317         return single_open(file, batadv_tt_local_seq_print_text, net_dev);
 318 }
 319
 320 struct batadv_debuginfo {
 321         struct attribute attr;
 322         const struct file_operations fops;
 323 };
 324
 325 #ifdef CONFIG_BATMAN_ADV_NC
 326 static int batadv_nc_nodes_open(struct inode *inode, struct file *file)
 327 {
 328         struct net_device *net_dev = (struct net_device *)inode->i_private;
 329
 330         return single_open(file, batadv_nc_nodes_seq_print_text, net_dev);
 331 }
 332 #endif
 333
 334 #define BATADV_DEBUGINFO(_name, _mode, _open)           \
 335 struct batadv_debuginfo batadv_debuginfo_##_name = {    \
 336         .attr = { .name = __stringify(_name),           \
 337                   .mode = _mode, },                     \
 338         .fops = { .owner = THIS_MODULE,                 \
 339                   .open = _open,                        \
 340                   .read = seq_read,                     \
 341                   .llseek = seq_lseek,                  \
 342                   .release = single_release,            \
 343                 }                                       \
 344 }
 345
 346 /* the following attributes are general and therefore they will be directly
 347  * placed in the BATADV_DEBUGFS_SUBDIR subdirectory of debugfs
 348  */
 349 static BATADV_DEBUGINFO(routing_algos, S_IRUGO, batadv_algorithms_open);
 350
 351 static struct batadv_debuginfo *batadv_general_debuginfos[] = {
 352         &batadv_debuginfo_routing_algos,
 353         NULL,
 354 };
 355
 356 /* The following attributes are per soft interface */
 357 static BATADV_DEBUGINFO(originators, S_IRUGO, batadv_originators_open);
 358 static BATADV_DEBUGINFO(gateways, S_IRUGO, batadv_gateways_open);
 359 static BATADV_DEBUGINFO(transtable_global, S_IRUGO,
 360                         batadv_transtable_global_open);
 361 #ifdef CONFIG_BATMAN_ADV_BLA
 362 static BATADV_DEBUGINFO(bla_claim_table, S_IRUGO, batadv_bla_claim_table_open);
 363 static BATADV_DEBUGINFO(bla_backbone_table, S_IRUGO,
 364                         batadv_bla_backbone_table_open);
 365 #endif
 366 #ifdef CONFIG_BATMAN_ADV_DAT
 367 static BATADV_DEBUGINFO(dat_cache, S_IRUGO, batadv_dat_cache_open);
 368 #endif
 369 static BATADV_DEBUGINFO(transtable_local, S_IRUGO,
 370                         batadv_transtable_local_open);
 371 #ifdef CONFIG_BATMAN_ADV_NC
 372 static BATADV_DEBUGINFO(nc_nodes, S_IRUGO, batadv_nc_nodes_open);
 373 #endif
 374
 375 static struct batadv_debuginfo *batadv_mesh_debuginfos[] = {
 376         &batadv_debuginfo_originators,
 377         &batadv_debuginfo_gateways,
 378         &batadv_debuginfo_transtable_global,
 379 #ifdef CONFIG_BATMAN_ADV_BLA
 380         &batadv_debuginfo_bla_claim_table,
 381         &batadv_debuginfo_bla_backbone_table,
 382 #endif
 383 #ifdef CONFIG_BATMAN_ADV_DAT
 384         &batadv_debuginfo_dat_cache,
 385 #endif
 386         &batadv_debuginfo_transtable_local,
 387 #ifdef CONFIG_BATMAN_ADV_NC
 388         &batadv_debuginfo_nc_nodes,
 389 #endif
 390         NULL,
 391 };
 392
 393 #define BATADV_HARDIF_DEBUGINFO(_name, _mode, _open)            \
 394 struct batadv_debuginfo batadv_hardif_debuginfo_##_name = {     \
 395         .attr = {                                               \
 396                 .name = __stringify(_name),                     \
 397                 .mode = _mode,                                  \
 398         },                                                      \
 399         .fops = {                                               \
 400                 .owner = THIS_MODULE,                           \
 401                 .open = _open,                                  \
 402                 .read   = seq_read,                             \
 403                 .llseek = seq_lseek,                            \
 404                 .release = single_release,                      \
 405         },                                                      \
 406 }
 407
 408 static BATADV_HARDIF_DEBUGINFO(originators, S_IRUGO,
 409                                batadv_originators_hardif_open);
 410
 411 static struct batadv_debuginfo *batadv_hardif_debuginfos[] = {
 412         &batadv_hardif_debuginfo_originators,
 413         NULL,
 414 };
 415
 416 void batadv_debugfs_init(void)
 417 {
 418         struct batadv_debuginfo **bat_debug;
 419         struct dentry *file;
 420
 421         batadv_debugfs = debugfs_create_dir(BATADV_DEBUGFS_SUBDIR, NULL);
 422         if (batadv_debugfs == ERR_PTR(-ENODEV))
 423                 batadv_debugfs = NULL;
 424
 425         if (!batadv_debugfs)
 426                 goto err;
 427
 428         for (bat_debug = batadv_general_debuginfos; *bat_debug; ++bat_debug) {
 429                 file = debugfs_create_file(((*bat_debug)->attr).name,
 430                                            S_IFREG | ((*bat_debug)->attr).mode,
 431                                            batadv_debugfs, NULL,
 432                                            &(*bat_debug)->fops);
 433                 if (!file) {
 434                         pr_err("Can't add general debugfs file: %s\n",
 435                                ((*bat_debug)->attr).name);
 436                         goto err;
 437                 }
 438         }
 439
 440         return;
 441 err:
 442         debugfs_remove_recursive(batadv_debugfs);
 443         batadv_debugfs = NULL;
 444 }
 445
 446 void batadv_debugfs_destroy(void)
 447 {
 448         debugfs_remove_recursive(batadv_debugfs);
 449         batadv_debugfs = NULL;
 450 }
 451
 452 /**
 453  * batadv_debugfs_add_hardif - creates the base directory for a hard interface
 454  *  in debugfs.
 455  * @hard_iface: hard interface which should be added.
 456  */
 457 int batadv_debugfs_add_hardif(struct batadv_hard_iface *hard_iface)
 458 {
 459         struct batadv_debuginfo **bat_debug;
 460         struct dentry *file;
 461
 462         if (!batadv_debugfs)
 463                 goto out;
 464
 465         hard_iface->debug_dir = debugfs_create_dir(hard_iface->net_dev->name,
 466                                                    batadv_debugfs);
 467         if (!hard_iface->debug_dir)
 468                 goto out;
 469
 470         for (bat_debug = batadv_hardif_debuginfos; *bat_debug; ++bat_debug) {
 471                 file = debugfs_create_file(((*bat_debug)->attr).name,
 472                                            S_IFREG | ((*bat_debug)->attr).mode,
 473                                            hard_iface->debug_dir,
 474                                            hard_iface->net_dev,
 475                                            &(*bat_debug)->fops);
 476                 if (!file)
 477                         goto rem_attr;
 478         }
 479
 480         return 0;
 481 rem_attr:
 482         debugfs_remove_recursive(hard_iface->debug_dir);
 483         hard_iface->debug_dir = NULL;
 484 out:
 485 #ifdef CONFIG_DEBUG_FS
 486         return -ENOMEM;
 487 #else
 488         return 0;
 489 #endif /* CONFIG_DEBUG_FS */
 490 }
 491
 492 /**
 493  * batadv_debugfs_del_hardif - delete the base directory for a hard interface
 494  *  in debugfs.
 495  * @hard_iface: hard interface which is deleted.
 496  */
 497 void batadv_debugfs_del_hardif(struct batadv_hard_iface *hard_iface)
 498 {
 499         if (batadv_debugfs) {
 500                 debugfs_remove_recursive(hard_iface->debug_dir);
 501                 hard_iface->debug_dir = NULL;
 502         }
 503 }
 504
 505 int batadv_debugfs_add_meshif(struct net_device *dev)
 506 {
 507         struct batadv_priv *bat_priv = netdev_priv(dev);
 508         struct batadv_debuginfo **bat_debug;
 509         struct dentry *file;
 510
 511         if (!batadv_debugfs)
 512                 goto out;
 513
 514         bat_priv->debug_dir = debugfs_create_dir(dev->name, batadv_debugfs);
 515         if (!bat_priv->debug_dir)
 516                 goto out;
 517
 518         if (batadv_socket_setup(bat_priv) < 0)
 519                 goto rem_attr;
 520
 521         if (batadv_debug_log_setup(bat_priv) < 0)
 522                 goto rem_attr;
 523
 524         for (bat_debug = batadv_mesh_debuginfos; *bat_debug; ++bat_debug) {
 525                 file = debugfs_create_file(((*bat_debug)->attr).name,
 526                                            S_IFREG | ((*bat_debug)->attr).mode,
 527                                            bat_priv->debug_dir,
 528                                            dev, &(*bat_debug)->fops);
 529                 if (!file) {
 530                         batadv_err(dev, "Can't add debugfs file: %s/%s\n",
 531                                    dev->name, ((*bat_debug)->attr).name);
 532                         goto rem_attr;
 533                 }
 534         }
 535
 536         if (batadv_nc_init_debugfs(bat_priv) < 0)
 537                 goto rem_attr;
 538
 539         return 0;
 540 rem_attr:
 541         debugfs_remove_recursive(bat_priv->debug_dir);
 542         bat_priv->debug_dir = NULL;
 543 out:
 544 #ifdef CONFIG_DEBUG_FS
 545         return -ENOMEM;
 546 #else
 547         return 0;
 548 #endif /* CONFIG_DEBUG_FS */
 549 }
 550
 551 void batadv_debugfs_del_meshif(struct net_device *dev)
 552 {
 553         struct batadv_priv *bat_priv = netdev_priv(dev);
 554
 555         batadv_debug_log_cleanup(bat_priv);
 556
 557         if (batadv_debugfs) {
 558                 debugfs_remove_recursive(bat_priv->debug_dir);
 559                 bat_priv->debug_dir = NULL;
 560         }
 561 }