net/batman-adv/debugfs.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright (C) 2010-2017  B.A.T.M.A.N. contributors:
   3  *
   4  * Marek Lindner
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of version 2 of the GNU General Public
   8  * License as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include "debugfs.h"
  20 #include "main.h"
  21
  22 #include <linux/debugfs.h>
  23 #include <linux/err.h>
  24 #include <linux/errno.h>
  25 #include <linux/export.h>
  26 #include <linux/fs.h>
  27 #include <linux/netdevice.h>
  28 #include <linux/printk.h>
  29 #include <linux/seq_file.h>
  30 #include <linux/stat.h>
  31 #include <linux/stddef.h>
  32 #include <linux/stringify.h>
  33 #include <linux/sysfs.h>
  34 #include <net/net_namespace.h>
  35
  36 #include "bat_algo.h"
  37 #include "bridge_loop_avoidance.h"
  38 #include "distributed-arp-table.h"
  39 #include "gateway_client.h"
  40 #include "icmp_socket.h"
  41 #include "log.h"
  42 #include "multicast.h"
  43 #include "network-coding.h"
  44 #include "originator.h"
  45 #include "translation-table.h"
  46
  47 static struct dentry *batadv_debugfs;
  48
  49 static int batadv_algorithms_open(struct inode *inode, struct file *file)
  50 {
  51         return single_open(file, batadv_algo_seq_print_text, NULL);
  52 }
  53
  54 static int neighbors_open(struct inode *inode, struct file *file)
  55 {
  56         struct net_device *net_dev = (struct net_device *)inode->i_private;
  57
  58         return single_open(file, batadv_hardif_neigh_seq_print_text, net_dev);
  59 }
  60
  61 static int batadv_originators_open(struct inode *inode, struct file *file)
  62 {
  63         struct net_device *net_dev = (struct net_device *)inode->i_private;
  64
  65         return single_open(file, batadv_orig_seq_print_text, net_dev);
  66 }
  67
  68 /**
  69  * batadv_originators_hardif_open() - handles debugfs output for the originator
  70  *  table of an hard interface
  71  * @inode: inode pointer to debugfs file
  72  * @file: pointer to the seq_file
  73  *
  74  * Return: 0 on success or negative error number in case of failure
  75  */
  76 static int batadv_originators_hardif_open(struct inode *inode,
  77                                           struct file *file)
  78 {
  79         struct net_device *net_dev = (struct net_device *)inode->i_private;
  80
  81         return single_open(file, batadv_orig_hardif_seq_print_text, net_dev);
  82 }
  83
  84 static int batadv_gateways_open(struct inode *inode, struct file *file)
  85 {
  86         struct net_device *net_dev = (struct net_device *)inode->i_private;
  87
  88         return single_open(file, batadv_gw_client_seq_print_text, net_dev);
  89 }
  90
  91 static int batadv_transtable_global_open(struct inode *inode, struct file *file)
  92 {
  93         struct net_device *net_dev = (struct net_device *)inode->i_private;
  94
  95         return single_open(file, batadv_tt_global_seq_print_text, net_dev);
  96 }
  97
  98 #ifdef CONFIG_BATMAN_ADV_BLA
  99 static int batadv_bla_claim_table_open(struct inode *inode, struct file *file)
 100 {
 101         struct net_device *net_dev = (struct net_device *)inode->i_private;
 102
 103         return single_open(file, batadv_bla_claim_table_seq_print_text,
 104                            net_dev);
 105 }
 106
 107 static int batadv_bla_backbone_table_open(struct inode *inode,
 108                                           struct file *file)
 109 {
 110         struct net_device *net_dev = (struct net_device *)inode->i_private;
 111
 112         return single_open(file, batadv_bla_backbone_table_seq_print_text,
 113                            net_dev);
 114 }
 115
 116 #endif
 117
 118 #ifdef CONFIG_BATMAN_ADV_DAT
 119 /**
 120  * batadv_dat_cache_open() - Prepare file handler for reads from dat_chache
 121  * @inode: inode which was opened
 122  * @file: file handle to be initialized
 123  *
 124  * Return: 0 on success or negative error number in case of failure
 125  */
 126 static int batadv_dat_cache_open(struct inode *inode, struct file *file)
 127 {
 128         struct net_device *net_dev = (struct net_device *)inode->i_private;
 129
 130         return single_open(file, batadv_dat_cache_seq_print_text, net_dev);
 131 }
 132 #endif
 133
 134 static int batadv_transtable_local_open(struct inode *inode, struct file *file)
 135 {
 136         struct net_device *net_dev = (struct net_device *)inode->i_private;
 137
 138         return single_open(file, batadv_tt_local_seq_print_text, net_dev);
 139 }
 140
 141 struct batadv_debuginfo {
 142         struct attribute attr;
 143         const struct file_operations fops;
 144 };
 145
 146 #ifdef CONFIG_BATMAN_ADV_NC
 147 static int batadv_nc_nodes_open(struct inode *inode, struct file *file)
 148 {
 149         struct net_device *net_dev = (struct net_device *)inode->i_private;
 150
 151         return single_open(file, batadv_nc_nodes_seq_print_text, net_dev);
 152 }
 153 #endif
 154
 155 #ifdef CONFIG_BATMAN_ADV_MCAST
 156 /**
 157  * batadv_mcast_flags_open() - prepare file handler for reads from mcast_flags
 158  * @inode: inode which was opened
 159  * @file: file handle to be initialized
 160  *
 161  * Return: 0 on success or negative error number in case of failure
 162  */
 163 static int batadv_mcast_flags_open(struct inode *inode, struct file *file)
 164 {
 165         struct net_device *net_dev = (struct net_device *)inode->i_private;
 166
 167         return single_open(file, batadv_mcast_flags_seq_print_text, net_dev);
 168 }
 169 #endif
 170
 171 #define BATADV_DEBUGINFO(_name, _mode, _open)           \
 172 struct batadv_debuginfo batadv_debuginfo_##_name = {    \
 173         .attr = {                                       \
 174                 .name = __stringify(_name),             \
 175                 .mode = _mode,                          \
 176         },                                              \
 177         .fops = {                                       \
 178                 .owner = THIS_MODULE,                   \
 179                 .open = _open,                          \
 180                 .read   = seq_read,                     \
 181                 .llseek = seq_lseek,                    \
 182                 .release = single_release,              \
 183         },                                              \
 184 }
 185
 186 /* the following attributes are general and therefore they will be directly
 187  * placed in the BATADV_DEBUGFS_SUBDIR subdirectory of debugfs
 188  */
 189 static BATADV_DEBUGINFO(routing_algos, 0444, batadv_algorithms_open);
 190
 191 static struct batadv_debuginfo *batadv_general_debuginfos[] = {
 192         &batadv_debuginfo_routing_algos,
 193         NULL,
 194 };
 195
 196 /* The following attributes are per soft interface */
 197 static BATADV_DEBUGINFO(neighbors, 0444, neighbors_open);
 198 static BATADV_DEBUGINFO(originators, 0444, batadv_originators_open);
 199 static BATADV_DEBUGINFO(gateways, 0444, batadv_gateways_open);
 200 static BATADV_DEBUGINFO(transtable_global, 0444, batadv_transtable_global_open);
 201 #ifdef CONFIG_BATMAN_ADV_BLA
 202 static BATADV_DEBUGINFO(bla_claim_table, 0444, batadv_bla_claim_table_open);
 203 static BATADV_DEBUGINFO(bla_backbone_table, 0444,
 204                         batadv_bla_backbone_table_open);
 205 #endif
 206 #ifdef CONFIG_BATMAN_ADV_DAT
 207 static BATADV_DEBUGINFO(dat_cache, 0444, batadv_dat_cache_open);
 208 #endif
 209 static BATADV_DEBUGINFO(transtable_local, 0444, batadv_transtable_local_open);
 210 #ifdef CONFIG_BATMAN_ADV_NC
 211 static BATADV_DEBUGINFO(nc_nodes, 0444, batadv_nc_nodes_open);
 212 #endif
 213 #ifdef CONFIG_BATMAN_ADV_MCAST
 214 static BATADV_DEBUGINFO(mcast_flags, 0444, batadv_mcast_flags_open);
 215 #endif
 216
 217 static struct batadv_debuginfo *batadv_mesh_debuginfos[] = {
 218         &batadv_debuginfo_neighbors,
 219         &batadv_debuginfo_originators,
 220         &batadv_debuginfo_gateways,
 221         &batadv_debuginfo_transtable_global,
 222 #ifdef CONFIG_BATMAN_ADV_BLA
 223         &batadv_debuginfo_bla_claim_table,
 224         &batadv_debuginfo_bla_backbone_table,
 225 #endif
 226 #ifdef CONFIG_BATMAN_ADV_DAT
 227         &batadv_debuginfo_dat_cache,
 228 #endif
 229         &batadv_debuginfo_transtable_local,
 230 #ifdef CONFIG_BATMAN_ADV_NC
 231         &batadv_debuginfo_nc_nodes,
 232 #endif
 233 #ifdef CONFIG_BATMAN_ADV_MCAST
 234         &batadv_debuginfo_mcast_flags,
 235 #endif
 236         NULL,
 237 };
 238
 239 #define BATADV_HARDIF_DEBUGINFO(_name, _mode, _open)            \
 240 struct batadv_debuginfo batadv_hardif_debuginfo_##_name = {     \
 241         .attr = {                                               \
 242                 .name = __stringify(_name),                     \
 243                 .mode = _mode,                                  \
 244         },                                                      \
 245         .fops = {                                               \
 246                 .owner = THIS_MODULE,                           \
 247                 .open = _open,                                  \
 248                 .read   = seq_read,                             \
 249                 .llseek = seq_lseek,                            \
 250                 .release = single_release,                      \
 251         },                                                      \
 252 }
 253
 254 static BATADV_HARDIF_DEBUGINFO(originators, 0444,
 255                                batadv_originators_hardif_open);
 256
 257 static struct batadv_debuginfo *batadv_hardif_debuginfos[] = {
 258         &batadv_hardif_debuginfo_originators,
 259         NULL,
 260 };
 261
 262 /**
 263  * batadv_debugfs_init() - Initialize soft interface independent debugfs entries
 264  */
 265 void batadv_debugfs_init(void)
 266 {
 267         struct batadv_debuginfo **bat_debug;
 268         struct dentry *file;
 269
 270         batadv_debugfs = debugfs_create_dir(BATADV_DEBUGFS_SUBDIR, NULL);
 271         if (batadv_debugfs == ERR_PTR(-ENODEV))
 272                 batadv_debugfs = NULL;
 273
 274         if (!batadv_debugfs)
 275                 goto err;
 276
 277         for (bat_debug = batadv_general_debuginfos; *bat_debug; ++bat_debug) {
 278                 file = debugfs_create_file(((*bat_debug)->attr).name,
 279                                            S_IFREG | ((*bat_debug)->attr).mode,
 280                                            batadv_debugfs, NULL,
 281                                            &(*bat_debug)->fops);
 282                 if (!file) {
 283                         pr_err("Can't add general debugfs file: %s\n",
 284                                ((*bat_debug)->attr).name);
 285                         goto err;
 286                 }
 287         }
 288
 289         return;
 290 err:
 291         debugfs_remove_recursive(batadv_debugfs);
 292         batadv_debugfs = NULL;
 293 }
 294
 295 /**
 296  * batadv_debugfs_destroy() - Remove all debugfs entries
 297  */
 298 void batadv_debugfs_destroy(void)
 299 {
 300         debugfs_remove_recursive(batadv_debugfs);
 301         batadv_debugfs = NULL;
 302 }
 303
 304 /**
 305  * batadv_debugfs_add_hardif() - creates the base directory for a hard interface
 306  *  in debugfs.
 307  * @hard_iface: hard interface which should be added.
 308  *
 309  * Return: 0 on success or negative error number in case of failure
 310  */
 311 int batadv_debugfs_add_hardif(struct batadv_hard_iface *hard_iface)
 312 {
 313         struct net *net = dev_net(hard_iface->net_dev);
 314         struct batadv_debuginfo **bat_debug;
 315         struct dentry *file;
 316
 317         if (!batadv_debugfs)
 318                 goto out;
 319
 320         if (net != &init_net)
 321                 return 0;
 322
 323         hard_iface->debug_dir = debugfs_create_dir(hard_iface->net_dev->name,
 324                                                    batadv_debugfs);
 325         if (!hard_iface->debug_dir)
 326                 goto out;
 327
 328         for (bat_debug = batadv_hardif_debuginfos; *bat_debug; ++bat_debug) {
 329                 file = debugfs_create_file(((*bat_debug)->attr).name,
 330                                            S_IFREG | ((*bat_debug)->attr).mode,
 331                                            hard_iface->debug_dir,
 332                                            hard_iface->net_dev,
 333                                            &(*bat_debug)->fops);
 334                 if (!file)
 335                         goto rem_attr;
 336         }
 337
 338         return 0;
 339 rem_attr:
 340         debugfs_remove_recursive(hard_iface->debug_dir);
 341         hard_iface->debug_dir = NULL;
 342 out:
 343         return -ENOMEM;
 344 }
 345
 346 /**
 347  * batadv_debugfs_del_hardif() - delete the base directory for a hard interface
 348  *  in debugfs.
 349  * @hard_iface: hard interface which is deleted.
 350  */
 351 void batadv_debugfs_del_hardif(struct batadv_hard_iface *hard_iface)
 352 {
 353         struct net *net = dev_net(hard_iface->net_dev);
 354
 355         if (net != &init_net)
 356                 return;
 357
 358         if (batadv_debugfs) {
 359                 debugfs_remove_recursive(hard_iface->debug_dir);
 360                 hard_iface->debug_dir = NULL;
 361         }
 362 }
 363
 364 /**
 365  * batadv_debugfs_add_meshif() - Initialize interface dependent debugfs entries
 366  * @dev: netdev struct of the soft interface
 367  *
 368  * Return: 0 on success or negative error number in case of failure
 369  */
 370 int batadv_debugfs_add_meshif(struct net_device *dev)
 371 {
 372         struct batadv_priv *bat_priv = netdev_priv(dev);
 373         struct batadv_debuginfo **bat_debug;
 374         struct net *net = dev_net(dev);
 375         struct dentry *file;
 376
 377         if (!batadv_debugfs)
 378                 goto out;
 379
 380         if (net != &init_net)
 381                 return 0;
 382
 383         bat_priv->debug_dir = debugfs_create_dir(dev->name, batadv_debugfs);
 384         if (!bat_priv->debug_dir)
 385                 goto out;
 386
 387         if (batadv_socket_setup(bat_priv) < 0)
 388                 goto rem_attr;
 389
 390         if (batadv_debug_log_setup(bat_priv) < 0)
 391                 goto rem_attr;
 392
 393         for (bat_debug = batadv_mesh_debuginfos; *bat_debug; ++bat_debug) {
 394                 file = debugfs_create_file(((*bat_debug)->attr).name,
 395                                            S_IFREG | ((*bat_debug)->attr).mode,
 396                                            bat_priv->debug_dir,
 397                                            dev, &(*bat_debug)->fops);
 398                 if (!file) {
 399                         batadv_err(dev, "Can't add debugfs file: %s/%s\n",
 400                                    dev->name, ((*bat_debug)->attr).name);
 401                         goto rem_attr;
 402                 }
 403         }
 404
 405         if (batadv_nc_init_debugfs(bat_priv) < 0)
 406                 goto rem_attr;
 407
 408         return 0;
 409 rem_attr:
 410         debugfs_remove_recursive(bat_priv->debug_dir);
 411         bat_priv->debug_dir = NULL;
 412 out:
 413         return -ENOMEM;
 414 }
 415
 416 /**
 417  * batadv_debugfs_del_meshif() - Remove interface dependent debugfs entries
 418  * @dev: netdev struct of the soft interface
 419  */
 420 void batadv_debugfs_del_meshif(struct net_device *dev)
 421 {
 422         struct batadv_priv *bat_priv = netdev_priv(dev);
 423         struct net *net = dev_net(dev);
 424
 425         if (net != &init_net)
 426                 return;
 427
 428         batadv_debug_log_cleanup(bat_priv);
 429
 430         if (batadv_debugfs) {
 431                 debugfs_remove_recursive(bat_priv->debug_dir);
 432                 bat_priv->debug_dir = NULL;
 433         }
 434 }