kernel/net/batman-adv/debugfs.c

   1 /* Copyright (C) 2010-2015 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 "debugfs.h"
  19 #include "main.h"
  20
  21 #include <linux/compiler.h>
  22 #include <linux/debugfs.h>
  23 #include <linux/device.h>
  24 #include <linux/errno.h>
  25 #include <linux/export.h>
  26 #include <linux/fcntl.h>
  27 #include <linux/fs.h>
  28 #include <linux/jiffies.h>
  29 #include <linux/kernel.h>
  30 #include <linux/module.h>
  31 #include <linux/netdevice.h>
  32 #include <linux/poll.h>
  33 #include <linux/printk.h>
  34 #include <linux/sched.h> /* for linux/wait.h */
  35 #include <linux/seq_file.h>
  36 #include <linux/slab.h>
  37 #include <linux/spinlock.h>
  38 #include <linux/stat.h>
  39 #include <linux/stddef.h>
  40 #include <linux/stringify.h>
  41 #include <linux/sysfs.h>
  42 #include <linux/types.h>
  43 #include <linux/uaccess.h>
  44 #include <linux/wait.h>
  45 #include <stdarg.h>
  46
  47 #include "bridge_loop_avoidance.h"
  48 #include "distributed-arp-table.h"
  49 #include "gateway_client.h"
  50 #include "icmp_socket.h"
  51 #include "network-coding.h"
  52 #include "originator.h"
  53 #include "translation-table.h"
  54
  55 static struct dentry *batadv_debugfs;
  56
  57 #ifdef CONFIG_BATMAN_ADV_DEBUG
  58 #define BATADV_LOG_BUFF_MASK (batadv_log_buff_len - 1)
  59
  60 static const int batadv_log_buff_len = BATADV_LOG_BUF_LEN;
  61
  62 static char *batadv_log_char_addr(struct batadv_priv_debug_log *debug_log,
  63                                   size_t idx)
  64 {
  65         return &debug_log->log_buff[idx & BATADV_LOG_BUFF_MASK];
  66 }
  67
  68 static void batadv_emit_log_char(struct batadv_priv_debug_log *debug_log,
  69                                  char c)
  70 {
  71         char *char_addr;
  72
  73         char_addr = batadv_log_char_addr(debug_log, debug_log->log_end);
  74         *char_addr = c;
  75         debug_log->log_end++;
  76
  77         if (debug_log->log_end - debug_log->log_start > batadv_log_buff_len)
  78                 debug_log->log_start = debug_log->log_end - batadv_log_buff_len;
  79 }
  80
  81 __printf(2, 3)
  82 static int batadv_fdebug_log(struct batadv_priv_debug_log *debug_log,
  83                              const char *fmt, ...)
  84 {
  85         va_list args;
  86         static char debug_log_buf[256];
  87         char *p;
  88
  89         if (!debug_log)
  90                 return 0;
  91
  92         spin_lock_bh(&debug_log->lock);
  93         va_start(args, fmt);
  94         vscnprintf(debug_log_buf, sizeof(debug_log_buf), fmt, args);
  95         va_end(args);
  96
  97         for (p = debug_log_buf; *p != 0; p++)
  98                 batadv_emit_log_char(debug_log, *p);
  99
 100         spin_unlock_bh(&debug_log->lock);
 101
 102         wake_up(&debug_log->queue_wait);
 103
 104         return 0;
 105 }
 106
 107 int batadv_debug_log(struct batadv_priv *bat_priv, const char *fmt, ...)
 108 {
 109         va_list args;
 110         char tmp_log_buf[256];
 111
 112         va_start(args, fmt);
 113         vscnprintf(tmp_log_buf, sizeof(tmp_log_buf), fmt, args);
 114         batadv_fdebug_log(bat_priv->debug_log, "[%10u] %s",
 115                           jiffies_to_msecs(jiffies), tmp_log_buf);
 116         va_end(args);
 117
 118         return 0;
 119 }
 120
 121 static int batadv_log_open(struct inode *inode, struct file *file)
 122 {
 123         if (!try_module_get(THIS_MODULE))
 124                 return -EBUSY;
 125
 126         nonseekable_open(inode, file);
 127         file->private_data = inode->i_private;
 128         return 0;
 129 }
 130
 131 static int batadv_log_release(struct inode *inode, struct file *file)
 132 {
 133         module_put(THIS_MODULE);
 134         return 0;
 135 }
 136
 137 static int batadv_log_empty(struct batadv_priv_debug_log *debug_log)
 138 {
 139         return !(debug_log->log_start - debug_log->log_end);
 140 }
 141
 142 static ssize_t batadv_log_read(struct file *file, char __user *buf,
 143                                size_t count, loff_t *ppos)
 144 {
 145         struct batadv_priv *bat_priv = file->private_data;
 146         struct batadv_priv_debug_log *debug_log = bat_priv->debug_log;
 147         int error, i = 0;
 148         char *char_addr;
 149         char c;
 150
 151         if ((file->f_flags & O_NONBLOCK) && batadv_log_empty(debug_log))
 152                 return -EAGAIN;
 153
 154         if (!buf)
 155                 return -EINVAL;
 156
 157         if (count == 0)
 158                 return 0;
 159
 160         if (!access_ok(VERIFY_WRITE, buf, count))
 161                 return -EFAULT;
 162
 163         error = wait_event_interruptible(debug_log->queue_wait,
 164                                          (!batadv_log_empty(debug_log)));
 165
 166         if (error)
 167                 return error;
 168
 169         spin_lock_bh(&debug_log->lock);
 170
 171         while ((!error) && (i < count) &&
 172                (debug_log->log_start != debug_log->log_end)) {
 173                 char_addr = batadv_log_char_addr(debug_log,
 174                                                  debug_log->log_start);
 175                 c = *char_addr;
 176
 177                 debug_log->log_start++;
 178
 179                 spin_unlock_bh(&debug_log->lock);
 180
 181                 error = __put_user(c, buf);
 182
 183                 spin_lock_bh(&debug_log->lock);
 184
 185                 buf++;
 186                 i++;
 187         }
 188
 189         spin_unlock_bh(&debug_log->lock);
 190
 191         if (!error)
 192                 return i;
 193
 194         return error;
 195 }
 196
 197 static unsigned int batadv_log_poll(struct file *file, poll_table *wait)
 198 {
 199         struct batadv_priv *bat_priv = file->private_data;
 200         struct batadv_priv_debug_log *debug_log = bat_priv->debug_log;
 201
 202         poll_wait(file, &debug_log->queue_wait, wait);
 203
 204         if (!batadv_log_empty(debug_log))
 205                 return POLLIN | POLLRDNORM;
 206
 207         return 0;
 208 }
 209
 210 static const struct file_operations batadv_log_fops = {
 211         .open           = batadv_log_open,
 212         .release        = batadv_log_release,
 213         .read           = batadv_log_read,
 214         .poll           = batadv_log_poll,
 215         .llseek         = no_llseek,
 216 };
 217
 218 static int batadv_debug_log_setup(struct batadv_priv *bat_priv)
 219 {
 220         struct dentry *d;
 221
 222         if (!bat_priv->debug_dir)
 223                 goto err;
 224
 225         bat_priv->debug_log = kzalloc(sizeof(*bat_priv->debug_log), GFP_ATOMIC);
 226         if (!bat_priv->debug_log)
 227                 goto err;
 228
 229         spin_lock_init(&bat_priv->debug_log->lock);
 230         init_waitqueue_head(&bat_priv->debug_log->queue_wait);
 231
 232         d = debugfs_create_file("log", S_IFREG | S_IRUSR,
 233                                 bat_priv->debug_dir, bat_priv,
 234                                 &batadv_log_fops);
 235         if (!d)
 236                 goto err;
 237
 238         return 0;
 239
 240 err:
 241         return -ENOMEM;
 242 }
 243
 244 static void batadv_debug_log_cleanup(struct batadv_priv *bat_priv)
 245 {
 246         kfree(bat_priv->debug_log);
 247         bat_priv->debug_log = NULL;
 248 }
 249 #else /* CONFIG_BATMAN_ADV_DEBUG */
 250 static int batadv_debug_log_setup(struct batadv_priv *bat_priv)
 251 {
 252         return 0;
 253 }
 254
 255 static void batadv_debug_log_cleanup(struct batadv_priv *bat_priv)
 256 {
 257 }
 258 #endif
 259
 260 static int batadv_algorithms_open(struct inode *inode, struct file *file)
 261 {
 262         return single_open(file, batadv_algo_seq_print_text, NULL);
 263 }
 264
 265 static int batadv_originators_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_orig_seq_print_text, net_dev);
 270 }
 271
 272 /**
 273  * batadv_originators_hardif_open - handles debugfs output for the
 274  *  originator table of an hard interface
 275  * @inode: inode pointer to debugfs file
 276  * @file: pointer to the seq_file
 277  */
 278 static int batadv_originators_hardif_open(struct inode *inode,
 279                                           struct file *file)
 280 {
 281         struct net_device *net_dev = (struct net_device *)inode->i_private;
 282
 283         return single_open(file, batadv_orig_hardif_seq_print_text, net_dev);
 284 }
 285
 286 static int batadv_gateways_open(struct inode *inode, struct file *file)
 287 {
 288         struct net_device *net_dev = (struct net_device *)inode->i_private;
 289
 290         return single_open(file, batadv_gw_client_seq_print_text, net_dev);
 291 }
 292
 293 static int batadv_transtable_global_open(struct inode *inode, struct file *file)
 294 {
 295         struct net_device *net_dev = (struct net_device *)inode->i_private;
 296
 297         return single_open(file, batadv_tt_global_seq_print_text, net_dev);
 298 }
 299
 300 #ifdef CONFIG_BATMAN_ADV_BLA
 301 static int batadv_bla_claim_table_open(struct inode *inode, struct file *file)
 302 {
 303         struct net_device *net_dev = (struct net_device *)inode->i_private;
 304
 305         return single_open(file, batadv_bla_claim_table_seq_print_text,
 306                            net_dev);
 307 }
 308
 309 static int batadv_bla_backbone_table_open(struct inode *inode,
 310                                           struct file *file)
 311 {
 312         struct net_device *net_dev = (struct net_device *)inode->i_private;
 313
 314         return single_open(file, batadv_bla_backbone_table_seq_print_text,
 315                            net_dev);
 316 }
 317
 318 #endif
 319
 320 #ifdef CONFIG_BATMAN_ADV_DAT
 321 /**
 322  * batadv_dat_cache_open - Prepare file handler for reads from dat_chache
 323  * @inode: inode which was opened
 324  * @file: file handle to be initialized
 325  */
 326 static int batadv_dat_cache_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_dat_cache_seq_print_text, net_dev);
 331 }
 332 #endif
 333
 334 static int batadv_transtable_local_open(struct inode *inode, struct file *file)
 335 {
 336         struct net_device *net_dev = (struct net_device *)inode->i_private;
 337
 338         return single_open(file, batadv_tt_local_seq_print_text, net_dev);
 339 }
 340
 341 struct batadv_debuginfo {
 342         struct attribute attr;
 343         const struct file_operations fops;
 344 };
 345
 346 #ifdef CONFIG_BATMAN_ADV_NC
 347 static int batadv_nc_nodes_open(struct inode *inode, struct file *file)
 348 {
 349         struct net_device *net_dev = (struct net_device *)inode->i_private;
 350
 351         return single_open(file, batadv_nc_nodes_seq_print_text, net_dev);
 352 }
 353 #endif
 354
 355 #define BATADV_DEBUGINFO(_name, _mode, _open)           \
 356 struct batadv_debuginfo batadv_debuginfo_##_name = {    \
 357         .attr = { .name = __stringify(_name),           \
 358                   .mode = _mode, },                     \
 359         .fops = { .owner = THIS_MODULE,                 \
 360                   .open = _open,                        \
 361                   .read = seq_read,                     \
 362                   .llseek = seq_lseek,                  \
 363                   .release = single_release,            \
 364                 }                                       \
 365 }
 366
 367 /* the following attributes are general and therefore they will be directly
 368  * placed in the BATADV_DEBUGFS_SUBDIR subdirectory of debugfs
 369  */
 370 static BATADV_DEBUGINFO(routing_algos, S_IRUGO, batadv_algorithms_open);
 371
 372 static struct batadv_debuginfo *batadv_general_debuginfos[] = {
 373         &batadv_debuginfo_routing_algos,
 374         NULL,
 375 };
 376
 377 /* The following attributes are per soft interface */
 378 static BATADV_DEBUGINFO(originators, S_IRUGO, batadv_originators_open);
 379 static BATADV_DEBUGINFO(gateways, S_IRUGO, batadv_gateways_open);
 380 static BATADV_DEBUGINFO(transtable_global, S_IRUGO,
 381                         batadv_transtable_global_open);
 382 #ifdef CONFIG_BATMAN_ADV_BLA
 383 static BATADV_DEBUGINFO(bla_claim_table, S_IRUGO, batadv_bla_claim_table_open);
 384 static BATADV_DEBUGINFO(bla_backbone_table, S_IRUGO,
 385                         batadv_bla_backbone_table_open);
 386 #endif
 387 #ifdef CONFIG_BATMAN_ADV_DAT
 388 static BATADV_DEBUGINFO(dat_cache, S_IRUGO, batadv_dat_cache_open);
 389 #endif
 390 static BATADV_DEBUGINFO(transtable_local, S_IRUGO,
 391                         batadv_transtable_local_open);
 392 #ifdef CONFIG_BATMAN_ADV_NC
 393 static BATADV_DEBUGINFO(nc_nodes, S_IRUGO, batadv_nc_nodes_open);
 394 #endif
 395
 396 static struct batadv_debuginfo *batadv_mesh_debuginfos[] = {
 397         &batadv_debuginfo_originators,
 398         &batadv_debuginfo_gateways,
 399         &batadv_debuginfo_transtable_global,
 400 #ifdef CONFIG_BATMAN_ADV_BLA
 401         &batadv_debuginfo_bla_claim_table,
 402         &batadv_debuginfo_bla_backbone_table,
 403 #endif
 404 #ifdef CONFIG_BATMAN_ADV_DAT
 405         &batadv_debuginfo_dat_cache,
 406 #endif
 407         &batadv_debuginfo_transtable_local,
 408 #ifdef CONFIG_BATMAN_ADV_NC
 409         &batadv_debuginfo_nc_nodes,
 410 #endif
 411         NULL,
 412 };
 413
 414 #define BATADV_HARDIF_DEBUGINFO(_name, _mode, _open)            \
 415 struct batadv_debuginfo batadv_hardif_debuginfo_##_name = {     \
 416         .attr = {                                               \
 417                 .name = __stringify(_name),                     \
 418                 .mode = _mode,                                  \
 419         },                                                      \
 420         .fops = {                                               \
 421                 .owner = THIS_MODULE,                           \
 422                 .open = _open,                                  \
 423                 .read   = seq_read,                             \
 424                 .llseek = seq_lseek,                            \
 425                 .release = single_release,                      \
 426         },                                                      \
 427 }
 428
 429 static BATADV_HARDIF_DEBUGINFO(originators, S_IRUGO,
 430                                batadv_originators_hardif_open);
 431
 432 static struct batadv_debuginfo *batadv_hardif_debuginfos[] = {
 433         &batadv_hardif_debuginfo_originators,
 434         NULL,
 435 };
 436
 437 void batadv_debugfs_init(void)
 438 {
 439         struct batadv_debuginfo **bat_debug;
 440         struct dentry *file;
 441
 442         batadv_debugfs = debugfs_create_dir(BATADV_DEBUGFS_SUBDIR, NULL);
 443         if (batadv_debugfs == ERR_PTR(-ENODEV))
 444                 batadv_debugfs = NULL;
 445
 446         if (!batadv_debugfs)
 447                 goto err;
 448
 449         for (bat_debug = batadv_general_debuginfos; *bat_debug; ++bat_debug) {
 450                 file = debugfs_create_file(((*bat_debug)->attr).name,
 451                                            S_IFREG | ((*bat_debug)->attr).mode,
 452                                            batadv_debugfs, NULL,
 453                                            &(*bat_debug)->fops);
 454                 if (!file) {
 455                         pr_err("Can't add general debugfs file: %s\n",
 456                                ((*bat_debug)->attr).name);
 457                         goto err;
 458                 }
 459         }
 460
 461         return;
 462 err:
 463         debugfs_remove_recursive(batadv_debugfs);
 464         batadv_debugfs = NULL;
 465 }
 466
 467 void batadv_debugfs_destroy(void)
 468 {
 469         debugfs_remove_recursive(batadv_debugfs);
 470         batadv_debugfs = NULL;
 471 }
 472
 473 /**
 474  * batadv_debugfs_add_hardif - creates the base directory for a hard interface
 475  *  in debugfs.
 476  * @hard_iface: hard interface which should be added.
 477  */
 478 int batadv_debugfs_add_hardif(struct batadv_hard_iface *hard_iface)
 479 {
 480         struct batadv_debuginfo **bat_debug;
 481         struct dentry *file;
 482
 483         if (!batadv_debugfs)
 484                 goto out;
 485
 486         hard_iface->debug_dir = debugfs_create_dir(hard_iface->net_dev->name,
 487                                                    batadv_debugfs);
 488         if (!hard_iface->debug_dir)
 489                 goto out;
 490
 491         for (bat_debug = batadv_hardif_debuginfos; *bat_debug; ++bat_debug) {
 492                 file = debugfs_create_file(((*bat_debug)->attr).name,
 493                                            S_IFREG | ((*bat_debug)->attr).mode,
 494                                            hard_iface->debug_dir,
 495                                            hard_iface->net_dev,
 496                                            &(*bat_debug)->fops);
 497                 if (!file)
 498                         goto rem_attr;
 499         }
 500
 501         return 0;
 502 rem_attr:
 503         debugfs_remove_recursive(hard_iface->debug_dir);
 504         hard_iface->debug_dir = NULL;
 505 out:
 506         return -ENOMEM;
 507 }
 508
 509 /**
 510  * batadv_debugfs_del_hardif - delete the base directory for a hard interface
 511  *  in debugfs.
 512  * @hard_iface: hard interface which is deleted.
 513  */
 514 void batadv_debugfs_del_hardif(struct batadv_hard_iface *hard_iface)
 515 {
 516         if (batadv_debugfs) {
 517                 debugfs_remove_recursive(hard_iface->debug_dir);
 518                 hard_iface->debug_dir = NULL;
 519         }
 520 }
 521
 522 int batadv_debugfs_add_meshif(struct net_device *dev)
 523 {
 524         struct batadv_priv *bat_priv = netdev_priv(dev);
 525         struct batadv_debuginfo **bat_debug;
 526         struct dentry *file;
 527
 528         if (!batadv_debugfs)
 529                 goto out;
 530
 531         bat_priv->debug_dir = debugfs_create_dir(dev->name, batadv_debugfs);
 532         if (!bat_priv->debug_dir)
 533                 goto out;
 534
 535         if (batadv_socket_setup(bat_priv) < 0)
 536                 goto rem_attr;
 537
 538         if (batadv_debug_log_setup(bat_priv) < 0)
 539                 goto rem_attr;
 540
 541         for (bat_debug = batadv_mesh_debuginfos; *bat_debug; ++bat_debug) {
 542                 file = debugfs_create_file(((*bat_debug)->attr).name,
 543                                            S_IFREG | ((*bat_debug)->attr).mode,
 544                                            bat_priv->debug_dir,
 545                                            dev, &(*bat_debug)->fops);
 546                 if (!file) {
 547                         batadv_err(dev, "Can't add debugfs file: %s/%s\n",
 548                                    dev->name, ((*bat_debug)->attr).name);
 549                         goto rem_attr;
 550                 }
 551         }
 552
 553         if (batadv_nc_init_debugfs(bat_priv) < 0)
 554                 goto rem_attr;
 555
 556         return 0;
 557 rem_attr:
 558         debugfs_remove_recursive(bat_priv->debug_dir);
 559         bat_priv->debug_dir = NULL;
 560 out:
 561         return -ENOMEM;
 562 }
 563
 564 void batadv_debugfs_del_meshif(struct net_device *dev)
 565 {
 566         struct batadv_priv *bat_priv = netdev_priv(dev);
 567
 568         batadv_debug_log_cleanup(bat_priv);
 569
 570         if (batadv_debugfs) {
 571                 debugfs_remove_recursive(bat_priv->debug_dir);
 572                 bat_priv->debug_dir = NULL;
 573         }
 574 }