net/batman-adv/debugfs.c

   1 /* Copyright (C) 2010-2012 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, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  17  * 02110-1301, USA
  18  */
  19
  20 #include "main.h"
  21
  22 #include <linux/debugfs.h>
  23
  24 #include "debugfs.h"
  25 #include "translation-table.h"
  26 #include "originator.h"
  27 #include "hard-interface.h"
  28 #include "gateway_common.h"
  29 #include "gateway_client.h"
  30 #include "soft-interface.h"
  31 #include "vis.h"
  32 #include "icmp_socket.h"
  33 #include "bridge_loop_avoidance.h"
  34 #include "distributed-arp-table.h"
  35
  36 static struct dentry *batadv_debugfs;
  37
  38 #ifdef CONFIG_BATMAN_ADV_DEBUG
  39 #define BATADV_LOG_BUFF_MASK (batadv_log_buff_len - 1)
  40
  41 static const int batadv_log_buff_len = BATADV_LOG_BUF_LEN;
  42
  43 static char *batadv_log_char_addr(struct batadv_debug_log *debug_log,
  44                                   size_t idx)
  45 {
  46         return &debug_log->log_buff[idx & BATADV_LOG_BUFF_MASK];
  47 }
  48
  49 static void batadv_emit_log_char(struct batadv_debug_log *debug_log, char c)
  50 {
  51         char *char_addr;
  52
  53         char_addr = batadv_log_char_addr(debug_log, debug_log->log_end);
  54         *char_addr = c;
  55         debug_log->log_end++;
  56
  57         if (debug_log->log_end - debug_log->log_start > batadv_log_buff_len)
  58                 debug_log->log_start = debug_log->log_end - batadv_log_buff_len;
  59 }
  60
  61 __printf(2, 3)
  62 static int batadv_fdebug_log(struct batadv_debug_log *debug_log,
  63                              const char *fmt, ...)
  64 {
  65         va_list args;
  66         static char debug_log_buf[256];
  67         char *p;
  68
  69         if (!debug_log)
  70                 return 0;
  71
  72         spin_lock_bh(&debug_log->lock);
  73         va_start(args, fmt);
  74         vscnprintf(debug_log_buf, sizeof(debug_log_buf), fmt, args);
  75         va_end(args);
  76
  77         for (p = debug_log_buf; *p != 0; p++)
  78                 batadv_emit_log_char(debug_log, *p);
  79
  80         spin_unlock_bh(&debug_log->lock);
  81
  82         wake_up(&debug_log->queue_wait);
  83
  84         return 0;
  85 }
  86
  87 int batadv_debug_log(struct batadv_priv *bat_priv, const char *fmt, ...)
  88 {
  89         va_list args;
  90         char tmp_log_buf[256];
  91
  92         va_start(args, fmt);
  93         vscnprintf(tmp_log_buf, sizeof(tmp_log_buf), fmt, args);
  94         batadv_fdebug_log(bat_priv->debug_log, "[%10u] %s",
  95                           jiffies_to_msecs(jiffies), tmp_log_buf);
  96         va_end(args);
  97
  98         return 0;
  99 }
 100
 101 static int batadv_log_open(struct inode *inode, struct file *file)
 102 {
 103         if (!try_module_get(THIS_MODULE))
 104                 return -EBUSY;
 105
 106         nonseekable_open(inode, file);
 107         file->private_data = inode->i_private;
 108         return 0;
 109 }
 110
 111 static int batadv_log_release(struct inode *inode, struct file *file)
 112 {
 113         module_put(THIS_MODULE);
 114         return 0;
 115 }
 116
 117 static int batadv_log_empty(struct batadv_debug_log *debug_log)
 118 {
 119         return !(debug_log->log_start - debug_log->log_end);
 120 }
 121
 122 static ssize_t batadv_log_read(struct file *file, char __user *buf,
 123                                size_t count, loff_t *ppos)
 124 {
 125         struct batadv_priv *bat_priv = file->private_data;
 126         struct batadv_debug_log *debug_log = bat_priv->debug_log;
 127         int error, i = 0;
 128         char *char_addr;
 129         char c;
 130
 131         if ((file->f_flags & O_NONBLOCK) && batadv_log_empty(debug_log))
 132                 return -EAGAIN;
 133
 134         if (!buf)
 135                 return -EINVAL;
 136
 137         if (count == 0)
 138                 return 0;
 139
 140         if (!access_ok(VERIFY_WRITE, buf, count))
 141                 return -EFAULT;
 142
 143         error = wait_event_interruptible(debug_log->queue_wait,
 144                                          (!batadv_log_empty(debug_log)));
 145
 146         if (error)
 147                 return error;
 148
 149         spin_lock_bh(&debug_log->lock);
 150
 151         while ((!error) && (i < count) &&
 152                (debug_log->log_start != debug_log->log_end)) {
 153                 char_addr = batadv_log_char_addr(debug_log,
 154                                                  debug_log->log_start);
 155                 c = *char_addr;
 156
 157                 debug_log->log_start++;
 158
 159                 spin_unlock_bh(&debug_log->lock);
 160
 161                 error = __put_user(c, buf);
 162
 163                 spin_lock_bh(&debug_log->lock);
 164
 165                 buf++;
 166                 i++;
 167
 168         }
 169
 170         spin_unlock_bh(&debug_log->lock);
 171
 172         if (!error)
 173                 return i;
 174
 175         return error;
 176 }
 177
 178 static unsigned int batadv_log_poll(struct file *file, poll_table *wait)
 179 {
 180         struct batadv_priv *bat_priv = file->private_data;
 181         struct batadv_debug_log *debug_log = bat_priv->debug_log;
 182
 183         poll_wait(file, &debug_log->queue_wait, wait);
 184
 185         if (!batadv_log_empty(debug_log))
 186                 return POLLIN | POLLRDNORM;
 187
 188         return 0;
 189 }
 190
 191 static const struct file_operations batadv_log_fops = {
 192         .open           = batadv_log_open,
 193         .release        = batadv_log_release,
 194         .read           = batadv_log_read,
 195         .poll           = batadv_log_poll,
 196         .llseek         = no_llseek,
 197 };
 198
 199 static int batadv_debug_log_setup(struct batadv_priv *bat_priv)
 200 {
 201         struct dentry *d;
 202
 203         if (!bat_priv->debug_dir)
 204                 goto err;
 205
 206         bat_priv->debug_log = kzalloc(sizeof(*bat_priv->debug_log), GFP_ATOMIC);
 207         if (!bat_priv->debug_log)
 208                 goto err;
 209
 210         spin_lock_init(&bat_priv->debug_log->lock);
 211         init_waitqueue_head(&bat_priv->debug_log->queue_wait);
 212
 213         d = debugfs_create_file("log", S_IFREG | S_IRUSR,
 214                                 bat_priv->debug_dir, bat_priv,
 215                                 &batadv_log_fops);
 216         if (!d)
 217                 goto err;
 218
 219         return 0;
 220
 221 err:
 222         return -ENOMEM;
 223 }
 224
 225 static void batadv_debug_log_cleanup(struct batadv_priv *bat_priv)
 226 {
 227         kfree(bat_priv->debug_log);
 228         bat_priv->debug_log = NULL;
 229 }
 230 #else /* CONFIG_BATMAN_ADV_DEBUG */
 231 static int batadv_debug_log_setup(struct batadv_priv *bat_priv)
 232 {
 233         bat_priv->debug_log = NULL;
 234         return 0;
 235 }
 236
 237 static void batadv_debug_log_cleanup(struct batadv_priv *bat_priv)
 238 {
 239         return;
 240 }
 241 #endif
 242
 243 static int batadv_algorithms_open(struct inode *inode, struct file *file)
 244 {
 245         return single_open(file, batadv_algo_seq_print_text, NULL);
 246 }
 247
 248 static int batadv_originators_open(struct inode *inode, struct file *file)
 249 {
 250         struct net_device *net_dev = (struct net_device *)inode->i_private;
 251         return single_open(file, batadv_orig_seq_print_text, net_dev);
 252 }
 253
 254 static int batadv_gateways_open(struct inode *inode, struct file *file)
 255 {
 256         struct net_device *net_dev = (struct net_device *)inode->i_private;
 257         return single_open(file, batadv_gw_client_seq_print_text, net_dev);
 258 }
 259
 260 static int batadv_transtable_global_open(struct inode *inode, struct file *file)
 261 {
 262         struct net_device *net_dev = (struct net_device *)inode->i_private;
 263         return single_open(file, batadv_tt_global_seq_print_text, net_dev);
 264 }
 265
 266 #ifdef CONFIG_BATMAN_ADV_BLA
 267 static int batadv_bla_claim_table_open(struct inode *inode, struct file *file)
 268 {
 269         struct net_device *net_dev = (struct net_device *)inode->i_private;
 270         return single_open(file, batadv_bla_claim_table_seq_print_text,
 271                            net_dev);
 272 }
 273
 274 static int batadv_bla_backbone_table_open(struct inode *inode,
 275                                           struct file *file)
 276 {
 277         struct net_device *net_dev = (struct net_device *)inode->i_private;
 278         return single_open(file, batadv_bla_backbone_table_seq_print_text,
 279                            net_dev);
 280 }
 281
 282 #endif
 283
 284 #ifdef CONFIG_BATMAN_ADV_DAT
 285 /**
 286  * batadv_dat_cache_open - Prepare file handler for reads from dat_chache
 287  * @inode: inode which was opened
 288  * @file: file handle to be initialized
 289  */
 290 static int batadv_dat_cache_open(struct inode *inode, struct file *file)
 291 {
 292         struct net_device *net_dev = (struct net_device *)inode->i_private;
 293         return single_open(file, batadv_dat_cache_seq_print_text, net_dev);
 294 }
 295 #endif
 296
 297 static int batadv_transtable_local_open(struct inode *inode, struct file *file)
 298 {
 299         struct net_device *net_dev = (struct net_device *)inode->i_private;
 300         return single_open(file, batadv_tt_local_seq_print_text, net_dev);
 301 }
 302
 303 static int batadv_vis_data_open(struct inode *inode, struct file *file)
 304 {
 305         struct net_device *net_dev = (struct net_device *)inode->i_private;
 306         return single_open(file, batadv_vis_seq_print_text, net_dev);
 307 }
 308
 309 struct batadv_debuginfo {
 310         struct attribute attr;
 311         const struct file_operations fops;
 312 };
 313
 314 #define BATADV_DEBUGINFO(_name, _mode, _open)           \
 315 struct batadv_debuginfo batadv_debuginfo_##_name = {    \
 316         .attr = { .name = __stringify(_name),           \
 317                   .mode = _mode, },                     \
 318         .fops = { .owner = THIS_MODULE,                 \
 319                   .open = _open,                        \
 320                   .read = seq_read,                     \
 321                   .llseek = seq_lseek,                  \
 322                   .release = single_release,            \
 323                 }                                       \
 324 };
 325
 326 /* the following attributes are general and therefore they will be directly
 327  * placed in the BATADV_DEBUGFS_SUBDIR subdirectory of debugfs
 328  */
 329 static BATADV_DEBUGINFO(routing_algos, S_IRUGO, batadv_algorithms_open);
 330
 331 static struct batadv_debuginfo *batadv_general_debuginfos[] = {
 332         &batadv_debuginfo_routing_algos,
 333         NULL,
 334 };
 335
 336 /* The following attributes are per soft interface */
 337 static BATADV_DEBUGINFO(originators, S_IRUGO, batadv_originators_open);
 338 static BATADV_DEBUGINFO(gateways, S_IRUGO, batadv_gateways_open);
 339 static BATADV_DEBUGINFO(transtable_global, S_IRUGO,
 340                         batadv_transtable_global_open);
 341 #ifdef CONFIG_BATMAN_ADV_BLA
 342 static BATADV_DEBUGINFO(bla_claim_table, S_IRUGO, batadv_bla_claim_table_open);
 343 static BATADV_DEBUGINFO(bla_backbone_table, S_IRUGO,
 344                         batadv_bla_backbone_table_open);
 345 #endif
 346 #ifdef CONFIG_BATMAN_ADV_DAT
 347 static BATADV_DEBUGINFO(dat_cache, S_IRUGO, batadv_dat_cache_open);
 348 #endif
 349 static BATADV_DEBUGINFO(transtable_local, S_IRUGO,
 350                         batadv_transtable_local_open);
 351 static BATADV_DEBUGINFO(vis_data, S_IRUGO, batadv_vis_data_open);
 352
 353 static struct batadv_debuginfo *batadv_mesh_debuginfos[] = {
 354         &batadv_debuginfo_originators,
 355         &batadv_debuginfo_gateways,
 356         &batadv_debuginfo_transtable_global,
 357 #ifdef CONFIG_BATMAN_ADV_BLA
 358         &batadv_debuginfo_bla_claim_table,
 359         &batadv_debuginfo_bla_backbone_table,
 360 #endif
 361 #ifdef CONFIG_BATMAN_ADV_DAT
 362         &batadv_debuginfo_dat_cache,
 363 #endif
 364         &batadv_debuginfo_transtable_local,
 365         &batadv_debuginfo_vis_data,
 366         NULL,
 367 };
 368
 369 void batadv_debugfs_init(void)
 370 {
 371         struct batadv_debuginfo **bat_debug;
 372         struct dentry *file;
 373
 374         batadv_debugfs = debugfs_create_dir(BATADV_DEBUGFS_SUBDIR, NULL);
 375         if (batadv_debugfs == ERR_PTR(-ENODEV))
 376                 batadv_debugfs = NULL;
 377
 378         if (!batadv_debugfs)
 379                 goto err;
 380
 381         for (bat_debug = batadv_general_debuginfos; *bat_debug; ++bat_debug) {
 382                 file = debugfs_create_file(((*bat_debug)->attr).name,
 383                                            S_IFREG | ((*bat_debug)->attr).mode,
 384                                            batadv_debugfs, NULL,
 385                                            &(*bat_debug)->fops);
 386                 if (!file) {
 387                         pr_err("Can't add general debugfs file: %s\n",
 388                                ((*bat_debug)->attr).name);
 389                         goto err;
 390                 }
 391         }
 392
 393         return;
 394 err:
 395         debugfs_remove_recursive(batadv_debugfs);
 396 }
 397
 398 void batadv_debugfs_destroy(void)
 399 {
 400         if (batadv_debugfs) {
 401                 debugfs_remove_recursive(batadv_debugfs);
 402                 batadv_debugfs = NULL;
 403         }
 404 }
 405
 406 int batadv_debugfs_add_meshif(struct net_device *dev)
 407 {
 408         struct batadv_priv *bat_priv = netdev_priv(dev);
 409         struct batadv_debuginfo **bat_debug;
 410         struct dentry *file;
 411
 412         if (!batadv_debugfs)
 413                 goto out;
 414
 415         bat_priv->debug_dir = debugfs_create_dir(dev->name, batadv_debugfs);
 416         if (!bat_priv->debug_dir)
 417                 goto out;
 418
 419         if (batadv_socket_setup(bat_priv) < 0)
 420                 goto rem_attr;
 421
 422         if (batadv_debug_log_setup(bat_priv) < 0)
 423                 goto rem_attr;
 424
 425         for (bat_debug = batadv_mesh_debuginfos; *bat_debug; ++bat_debug) {
 426                 file = debugfs_create_file(((*bat_debug)->attr).name,
 427                                            S_IFREG | ((*bat_debug)->attr).mode,
 428                                            bat_priv->debug_dir,
 429                                            dev, &(*bat_debug)->fops);
 430                 if (!file) {
 431                         batadv_err(dev, "Can't add debugfs file: %s/%s\n",
 432                                    dev->name, ((*bat_debug)->attr).name);
 433                         goto rem_attr;
 434                 }
 435         }
 436
 437         return 0;
 438 rem_attr:
 439         debugfs_remove_recursive(bat_priv->debug_dir);
 440         bat_priv->debug_dir = NULL;
 441 out:
 442 #ifdef CONFIG_DEBUG_FS
 443         return -ENOMEM;
 444 #else
 445         return 0;
 446 #endif /* CONFIG_DEBUG_FS */
 447 }
 448
 449 void batadv_debugfs_del_meshif(struct net_device *dev)
 450 {
 451         struct batadv_priv *bat_priv = netdev_priv(dev);
 452
 453         batadv_debug_log_cleanup(bat_priv);
 454
 455         if (batadv_debugfs) {
 456                 debugfs_remove_recursive(bat_priv->debug_dir);
 457                 bat_priv->debug_dir = NULL;
 458         }
 459 }