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
  35 static struct dentry *batadv_debugfs;
  36
  37 #ifdef CONFIG_BATMAN_ADV_DEBUG
  38 #define BATADV_LOG_BUFF_MASK (batadv_log_buff_len - 1)
  39
  40 static const int batadv_log_buff_len = BATADV_LOG_BUF_LEN;
  41
  42 static char *batadv_log_char_addr(struct batadv_debug_log *debug_log,
  43                                   size_t idx)
  44 {
  45         return &debug_log->log_buff[idx & BATADV_LOG_BUFF_MASK];
  46 }
  47
  48 static void batadv_emit_log_char(struct batadv_debug_log *debug_log, 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_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         nonseekable_open(inode, file);
 103         file->private_data = inode->i_private;
 104         batadv_inc_module_count();
 105         return 0;
 106 }
 107
 108 static int batadv_log_release(struct inode *inode, struct file *file)
 109 {
 110         batadv_dec_module_count();
 111         return 0;
 112 }
 113
 114 static int batadv_log_empty(struct batadv_debug_log *debug_log)
 115 {
 116         return !(debug_log->log_start - debug_log->log_end);
 117 }
 118
 119 static ssize_t batadv_log_read(struct file *file, char __user *buf,
 120                                size_t count, loff_t *ppos)
 121 {
 122         struct batadv_priv *bat_priv = file->private_data;
 123         struct batadv_debug_log *debug_log = bat_priv->debug_log;
 124         int error, i = 0;
 125         char *char_addr;
 126         char c;
 127
 128         if ((file->f_flags & O_NONBLOCK) && batadv_log_empty(debug_log))
 129                 return -EAGAIN;
 130
 131         if (!buf)
 132                 return -EINVAL;
 133
 134         if (count == 0)
 135                 return 0;
 136
 137         if (!access_ok(VERIFY_WRITE, buf, count))
 138                 return -EFAULT;
 139
 140         error = wait_event_interruptible(debug_log->queue_wait,
 141                                          (!batadv_log_empty(debug_log)));
 142
 143         if (error)
 144                 return error;
 145
 146         spin_lock_bh(&debug_log->lock);
 147
 148         while ((!error) && (i < count) &&
 149                (debug_log->log_start != debug_log->log_end)) {
 150                 char_addr = batadv_log_char_addr(debug_log,
 151                                                  debug_log->log_start);
 152                 c = *char_addr;
 153
 154                 debug_log->log_start++;
 155
 156                 spin_unlock_bh(&debug_log->lock);
 157
 158                 error = __put_user(c, buf);
 159
 160                 spin_lock_bh(&debug_log->lock);
 161
 162                 buf++;
 163                 i++;
 164
 165         }
 166
 167         spin_unlock_bh(&debug_log->lock);
 168
 169         if (!error)
 170                 return i;
 171
 172         return error;
 173 }
 174
 175 static unsigned int batadv_log_poll(struct file *file, poll_table *wait)
 176 {
 177         struct batadv_priv *bat_priv = file->private_data;
 178         struct batadv_debug_log *debug_log = bat_priv->debug_log;
 179
 180         poll_wait(file, &debug_log->queue_wait, wait);
 181
 182         if (!batadv_log_empty(debug_log))
 183                 return POLLIN | POLLRDNORM;
 184
 185         return 0;
 186 }
 187
 188 static const struct file_operations batadv_log_fops = {
 189         .open           = batadv_log_open,
 190         .release        = batadv_log_release,
 191         .read           = batadv_log_read,
 192         .poll           = batadv_log_poll,
 193         .llseek         = no_llseek,
 194 };
 195
 196 static int batadv_debug_log_setup(struct batadv_priv *bat_priv)
 197 {
 198         struct dentry *d;
 199
 200         if (!bat_priv->debug_dir)
 201                 goto err;
 202
 203         bat_priv->debug_log = kzalloc(sizeof(*bat_priv->debug_log), GFP_ATOMIC);
 204         if (!bat_priv->debug_log)
 205                 goto err;
 206
 207         spin_lock_init(&bat_priv->debug_log->lock);
 208         init_waitqueue_head(&bat_priv->debug_log->queue_wait);
 209
 210         d = debugfs_create_file("log", S_IFREG | S_IRUSR,
 211                                 bat_priv->debug_dir, bat_priv,
 212                                 &batadv_log_fops);
 213         if (!d)
 214                 goto err;
 215
 216         return 0;
 217
 218 err:
 219         return -ENOMEM;
 220 }
 221
 222 static void batadv_debug_log_cleanup(struct batadv_priv *bat_priv)
 223 {
 224         kfree(bat_priv->debug_log);
 225         bat_priv->debug_log = NULL;
 226 }
 227 #else /* CONFIG_BATMAN_ADV_DEBUG */
 228 static int batadv_debug_log_setup(struct batadv_priv *bat_priv)
 229 {
 230         bat_priv->debug_log = NULL;
 231         return 0;
 232 }
 233
 234 static void batadv_debug_log_cleanup(struct batadv_priv *bat_priv)
 235 {
 236         return;
 237 }
 238 #endif
 239
 240 static int batadv_algorithms_open(struct inode *inode, struct file *file)
 241 {
 242         return single_open(file, batadv_algo_seq_print_text, NULL);
 243 }
 244
 245 static int batadv_originators_open(struct inode *inode, struct file *file)
 246 {
 247         struct net_device *net_dev = (struct net_device *)inode->i_private;
 248         return single_open(file, batadv_orig_seq_print_text, net_dev);
 249 }
 250
 251 static int batadv_gateways_open(struct inode *inode, struct file *file)
 252 {
 253         struct net_device *net_dev = (struct net_device *)inode->i_private;
 254         return single_open(file, batadv_gw_client_seq_print_text, net_dev);
 255 }
 256
 257 static int batadv_transtable_global_open(struct inode *inode, struct file *file)
 258 {
 259         struct net_device *net_dev = (struct net_device *)inode->i_private;
 260         return single_open(file, batadv_tt_global_seq_print_text, net_dev);
 261 }
 262
 263 #ifdef CONFIG_BATMAN_ADV_BLA
 264 static int batadv_bla_claim_table_open(struct inode *inode, struct file *file)
 265 {
 266         struct net_device *net_dev = (struct net_device *)inode->i_private;
 267         return single_open(file, batadv_bla_claim_table_seq_print_text,
 268                            net_dev);
 269 }
 270 #endif
 271
 272 static int batadv_transtable_local_open(struct inode *inode, struct file *file)
 273 {
 274         struct net_device *net_dev = (struct net_device *)inode->i_private;
 275         return single_open(file, batadv_tt_local_seq_print_text, net_dev);
 276 }
 277
 278 static int batadv_vis_data_open(struct inode *inode, struct file *file)
 279 {
 280         struct net_device *net_dev = (struct net_device *)inode->i_private;
 281         return single_open(file, batadv_vis_seq_print_text, net_dev);
 282 }
 283
 284 struct batadv_debuginfo {
 285         struct attribute attr;
 286         const struct file_operations fops;
 287 };
 288
 289 #define BATADV_DEBUGINFO(_name, _mode, _open)           \
 290 struct batadv_debuginfo batadv_debuginfo_##_name = {    \
 291         .attr = { .name = __stringify(_name),           \
 292                   .mode = _mode, },                     \
 293         .fops = { .owner = THIS_MODULE,                 \
 294                   .open = _open,                        \
 295                   .read = seq_read,                     \
 296                   .llseek = seq_lseek,                  \
 297                   .release = single_release,            \
 298                 }                                       \
 299 };
 300
 301 static BATADV_DEBUGINFO(routing_algos, S_IRUGO, batadv_algorithms_open);
 302 static BATADV_DEBUGINFO(originators, S_IRUGO, batadv_originators_open);
 303 static BATADV_DEBUGINFO(gateways, S_IRUGO, batadv_gateways_open);
 304 static BATADV_DEBUGINFO(transtable_global, S_IRUGO,
 305                         batadv_transtable_global_open);
 306 #ifdef CONFIG_BATMAN_ADV_BLA
 307 static BATADV_DEBUGINFO(bla_claim_table, S_IRUGO, batadv_bla_claim_table_open);
 308 #endif
 309 static BATADV_DEBUGINFO(transtable_local, S_IRUGO,
 310                         batadv_transtable_local_open);
 311 static BATADV_DEBUGINFO(vis_data, S_IRUGO, batadv_vis_data_open);
 312
 313 static struct batadv_debuginfo *batadv_mesh_debuginfos[] = {
 314         &batadv_debuginfo_originators,
 315         &batadv_debuginfo_gateways,
 316         &batadv_debuginfo_transtable_global,
 317 #ifdef CONFIG_BATMAN_ADV_BLA
 318         &batadv_debuginfo_bla_claim_table,
 319 #endif
 320         &batadv_debuginfo_transtable_local,
 321         &batadv_debuginfo_vis_data,
 322         NULL,
 323 };
 324
 325 void batadv_debugfs_init(void)
 326 {
 327         struct batadv_debuginfo *bat_debug;
 328         struct dentry *file;
 329
 330         batadv_debugfs = debugfs_create_dir(BATADV_DEBUGFS_SUBDIR, NULL);
 331         if (batadv_debugfs == ERR_PTR(-ENODEV))
 332                 batadv_debugfs = NULL;
 333
 334         if (!batadv_debugfs)
 335                 goto out;
 336
 337         bat_debug = &batadv_debuginfo_routing_algos;
 338         file = debugfs_create_file(bat_debug->attr.name,
 339                                    S_IFREG | bat_debug->attr.mode,
 340                                    batadv_debugfs, NULL, &bat_debug->fops);
 341         if (!file)
 342                 pr_err("Can't add debugfs file: %s\n", bat_debug->attr.name);
 343
 344 out:
 345         return;
 346 }
 347
 348 void batadv_debugfs_destroy(void)
 349 {
 350         if (batadv_debugfs) {
 351                 debugfs_remove_recursive(batadv_debugfs);
 352                 batadv_debugfs = NULL;
 353         }
 354 }
 355
 356 int batadv_debugfs_add_meshif(struct net_device *dev)
 357 {
 358         struct batadv_priv *bat_priv = netdev_priv(dev);
 359         struct batadv_debuginfo **bat_debug;
 360         struct dentry *file;
 361
 362         if (!batadv_debugfs)
 363                 goto out;
 364
 365         bat_priv->debug_dir = debugfs_create_dir(dev->name, batadv_debugfs);
 366         if (!bat_priv->debug_dir)
 367                 goto out;
 368
 369         if (batadv_socket_setup(bat_priv) < 0)
 370                 goto rem_attr;
 371
 372         if (batadv_debug_log_setup(bat_priv) < 0)
 373                 goto rem_attr;
 374
 375         for (bat_debug = batadv_mesh_debuginfos; *bat_debug; ++bat_debug) {
 376                 file = debugfs_create_file(((*bat_debug)->attr).name,
 377                                            S_IFREG | ((*bat_debug)->attr).mode,
 378                                            bat_priv->debug_dir,
 379                                            dev, &(*bat_debug)->fops);
 380                 if (!file) {
 381                         batadv_err(dev, "Can't add debugfs file: %s/%s\n",
 382                                    dev->name, ((*bat_debug)->attr).name);
 383                         goto rem_attr;
 384                 }
 385         }
 386
 387         return 0;
 388 rem_attr:
 389         debugfs_remove_recursive(bat_priv->debug_dir);
 390         bat_priv->debug_dir = NULL;
 391 out:
 392 #ifdef CONFIG_DEBUG_FS
 393         return -ENOMEM;
 394 #else
 395         return 0;
 396 #endif /* CONFIG_DEBUG_FS */
 397 }
 398
 399 void batadv_debugfs_del_meshif(struct net_device *dev)
 400 {
 401         struct batadv_priv *bat_priv = netdev_priv(dev);
 402
 403         batadv_debug_log_cleanup(bat_priv);
 404
 405         if (batadv_debugfs) {
 406                 debugfs_remove_recursive(bat_priv->debug_dir);
 407                 bat_priv->debug_dir = NULL;
 408         }
 409 }