net/batman-adv/hard-interface.c

   1 /* Copyright (C) 2007-2015 B.A.T.M.A.N. contributors:
   2  *
   3  * Marek Lindner, Simon Wunderlich
   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 "hard-interface.h"
  19 #include "main.h"
  20
  21 #include <linux/byteorder/generic.h>
  22 #include <linux/errno.h>
  23 #include <linux/fs.h>
  24 #include <linux/if_arp.h>
  25 #include <linux/if_ether.h>
  26 #include <linux/if.h>
  27 #include <linux/kernel.h>
  28 #include <linux/list.h>
  29 #include <linux/mutex.h>
  30 #include <linux/netdevice.h>
  31 #include <linux/printk.h>
  32 #include <linux/rculist.h>
  33 #include <linux/rtnetlink.h>
  34 #include <linux/slab.h>
  35 #include <linux/workqueue.h>
  36 #include <net/net_namespace.h>
  37
  38 #include "bridge_loop_avoidance.h"
  39 #include "debugfs.h"
  40 #include "distributed-arp-table.h"
  41 #include "gateway_client.h"
  42 #include "originator.h"
  43 #include "packet.h"
  44 #include "send.h"
  45 #include "soft-interface.h"
  46 #include "sysfs.h"
  47 #include "translation-table.h"
  48
  49 /**
  50  * batadv_hardif_release - release hard interface from lists and queue for
  51  *  free after rcu grace period
  52  * @hard_iface: the hard interface to free
  53  */
  54 void batadv_hardif_release(struct batadv_hard_iface *hard_iface)
  55 {
  56         dev_put(hard_iface->net_dev);
  57
  58         kfree_rcu(hard_iface, rcu);
  59 }
  60
  61 struct batadv_hard_iface *
  62 batadv_hardif_get_by_netdev(const struct net_device *net_dev)
  63 {
  64         struct batadv_hard_iface *hard_iface;
  65
  66         rcu_read_lock();
  67         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
  68                 if (hard_iface->net_dev == net_dev &&
  69                     atomic_inc_not_zero(&hard_iface->refcount))
  70                         goto out;
  71         }
  72
  73         hard_iface = NULL;
  74
  75 out:
  76         rcu_read_unlock();
  77         return hard_iface;
  78 }
  79
  80 /**
  81  * batadv_mutual_parents - check if two devices are each others parent
  82  * @dev1: 1st net_device
  83  * @dev2: 2nd net_device
  84  *
  85  * veth devices come in pairs and each is the parent of the other!
  86  *
  87  * Return: true if the devices are each others parent, otherwise false
  88  */
  89 static bool batadv_mutual_parents(const struct net_device *dev1,
  90                                   const struct net_device *dev2)
  91 {
  92         int dev1_parent_iflink = dev_get_iflink(dev1);
  93         int dev2_parent_iflink = dev_get_iflink(dev2);
  94
  95         if (!dev1_parent_iflink || !dev2_parent_iflink)
  96                 return false;
  97
  98         return (dev1_parent_iflink == dev2->ifindex) &&
  99                (dev2_parent_iflink == dev1->ifindex);
 100 }
 101
 102 /**
 103  * batadv_is_on_batman_iface - check if a device is a batman iface descendant
 104  * @net_dev: the device to check
 105  *
 106  * If the user creates any virtual device on top of a batman-adv interface, it
 107  * is important to prevent this new interface to be used to create a new mesh
 108  * network (this behaviour would lead to a batman-over-batman configuration).
 109  * This function recursively checks all the fathers of the device passed as
 110  * argument looking for a batman-adv soft interface.
 111  *
 112  * Returns true if the device is descendant of a batman-adv mesh interface (or
 113  * if it is a batman-adv interface itself), false otherwise
 114  */
 115 static bool batadv_is_on_batman_iface(const struct net_device *net_dev)
 116 {
 117         struct net_device *parent_dev;
 118         bool ret;
 119
 120         /* check if this is a batman-adv mesh interface */
 121         if (batadv_softif_is_valid(net_dev))
 122                 return true;
 123
 124         /* no more parents..stop recursion */
 125         if (dev_get_iflink(net_dev) == 0 ||
 126             dev_get_iflink(net_dev) == net_dev->ifindex)
 127                 return false;
 128
 129         /* recurse over the parent device */
 130         parent_dev = __dev_get_by_index(&init_net, dev_get_iflink(net_dev));
 131         /* if we got a NULL parent_dev there is something broken.. */
 132         if (!parent_dev) {
 133                 pr_err("Cannot find parent device\n");
 134                 return false;
 135         }
 136
 137         if (batadv_mutual_parents(net_dev, parent_dev))
 138                 return false;
 139
 140         ret = batadv_is_on_batman_iface(parent_dev);
 141
 142         return ret;
 143 }
 144
 145 static int batadv_is_valid_iface(const struct net_device *net_dev)
 146 {
 147         if (net_dev->flags & IFF_LOOPBACK)
 148                 return 0;
 149
 150         if (net_dev->type != ARPHRD_ETHER)
 151                 return 0;
 152
 153         if (net_dev->addr_len != ETH_ALEN)
 154                 return 0;
 155
 156         /* no batman over batman */
 157         if (batadv_is_on_batman_iface(net_dev))
 158                 return 0;
 159
 160         return 1;
 161 }
 162
 163 /**
 164  * batadv_is_wifi_netdev - check if the given net_device struct is a wifi
 165  *  interface
 166  * @net_device: the device to check
 167  *
 168  * Returns true if the net device is a 802.11 wireless device, false otherwise.
 169  */
 170 bool batadv_is_wifi_netdev(struct net_device *net_device)
 171 {
 172         if (!net_device)
 173                 return false;
 174
 175 #ifdef CONFIG_WIRELESS_EXT
 176         /* pre-cfg80211 drivers have to implement WEXT, so it is possible to
 177          * check for wireless_handlers != NULL
 178          */
 179         if (net_device->wireless_handlers)
 180                 return true;
 181 #endif
 182
 183         /* cfg80211 drivers have to set ieee80211_ptr */
 184         if (net_device->ieee80211_ptr)
 185                 return true;
 186
 187         return false;
 188 }
 189
 190 static struct batadv_hard_iface *
 191 batadv_hardif_get_active(const struct net_device *soft_iface)
 192 {
 193         struct batadv_hard_iface *hard_iface;
 194
 195         rcu_read_lock();
 196         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
 197                 if (hard_iface->soft_iface != soft_iface)
 198                         continue;
 199
 200                 if (hard_iface->if_status == BATADV_IF_ACTIVE &&
 201                     atomic_inc_not_zero(&hard_iface->refcount))
 202                         goto out;
 203         }
 204
 205         hard_iface = NULL;
 206
 207 out:
 208         rcu_read_unlock();
 209         return hard_iface;
 210 }
 211
 212 static void batadv_primary_if_update_addr(struct batadv_priv *bat_priv,
 213                                           struct batadv_hard_iface *oldif)
 214 {
 215         struct batadv_hard_iface *primary_if;
 216
 217         primary_if = batadv_primary_if_get_selected(bat_priv);
 218         if (!primary_if)
 219                 goto out;
 220
 221         batadv_dat_init_own_addr(bat_priv, primary_if);
 222         batadv_bla_update_orig_address(bat_priv, primary_if, oldif);
 223 out:
 224         if (primary_if)
 225                 batadv_hardif_free_ref(primary_if);
 226 }
 227
 228 static void batadv_primary_if_select(struct batadv_priv *bat_priv,
 229                                      struct batadv_hard_iface *new_hard_iface)
 230 {
 231         struct batadv_hard_iface *curr_hard_iface;
 232
 233         ASSERT_RTNL();
 234
 235         if (new_hard_iface && !atomic_inc_not_zero(&new_hard_iface->refcount))
 236                 new_hard_iface = NULL;
 237
 238         curr_hard_iface = rcu_dereference_protected(bat_priv->primary_if, 1);
 239         rcu_assign_pointer(bat_priv->primary_if, new_hard_iface);
 240
 241         if (!new_hard_iface)
 242                 goto out;
 243
 244         bat_priv->bat_algo_ops->bat_primary_iface_set(new_hard_iface);
 245         batadv_primary_if_update_addr(bat_priv, curr_hard_iface);
 246
 247 out:
 248         if (curr_hard_iface)
 249                 batadv_hardif_free_ref(curr_hard_iface);
 250 }
 251
 252 static bool
 253 batadv_hardif_is_iface_up(const struct batadv_hard_iface *hard_iface)
 254 {
 255         if (hard_iface->net_dev->flags & IFF_UP)
 256                 return true;
 257
 258         return false;
 259 }
 260
 261 static void batadv_check_known_mac_addr(const struct net_device *net_dev)
 262 {
 263         const struct batadv_hard_iface *hard_iface;
 264
 265         rcu_read_lock();
 266         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
 267                 if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
 268                     (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
 269                         continue;
 270
 271                 if (hard_iface->net_dev == net_dev)
 272                         continue;
 273
 274                 if (!batadv_compare_eth(hard_iface->net_dev->dev_addr,
 275                                         net_dev->dev_addr))
 276                         continue;
 277
 278                 pr_warn("The newly added mac address (%pM) already exists on: %s\n",
 279                         net_dev->dev_addr, hard_iface->net_dev->name);
 280                 pr_warn("It is strongly recommended to keep mac addresses unique to avoid problems!\n");
 281         }
 282         rcu_read_unlock();
 283 }
 284
 285 /**
 286  * batadv_hardif_recalc_extra_skbroom() - Recalculate skbuff extra head/tailroom
 287  * @soft_iface: netdev struct of the mesh interface
 288  */
 289 static void batadv_hardif_recalc_extra_skbroom(struct net_device *soft_iface)
 290 {
 291         const struct batadv_hard_iface *hard_iface;
 292         unsigned short lower_header_len = ETH_HLEN;
 293         unsigned short lower_headroom = 0;
 294         unsigned short lower_tailroom = 0;
 295         unsigned short needed_headroom;
 296
 297         rcu_read_lock();
 298         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
 299                 if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
 300                         continue;
 301
 302                 if (hard_iface->soft_iface != soft_iface)
 303                         continue;
 304
 305                 lower_header_len = max_t(unsigned short, lower_header_len,
 306                                          hard_iface->net_dev->hard_header_len);
 307
 308                 lower_headroom = max_t(unsigned short, lower_headroom,
 309                                        hard_iface->net_dev->needed_headroom);
 310
 311                 lower_tailroom = max_t(unsigned short, lower_tailroom,
 312                                        hard_iface->net_dev->needed_tailroom);
 313         }
 314         rcu_read_unlock();
 315
 316         needed_headroom = lower_headroom + (lower_header_len - ETH_HLEN);
 317         needed_headroom += batadv_max_header_len();
 318
 319         soft_iface->needed_headroom = needed_headroom;
 320         soft_iface->needed_tailroom = lower_tailroom;
 321 }
 322
 323 int batadv_hardif_min_mtu(struct net_device *soft_iface)
 324 {
 325         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 326         const struct batadv_hard_iface *hard_iface;
 327         int min_mtu = INT_MAX;
 328
 329         rcu_read_lock();
 330         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
 331                 if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
 332                     (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
 333                         continue;
 334
 335                 if (hard_iface->soft_iface != soft_iface)
 336                         continue;
 337
 338                 min_mtu = min_t(int, hard_iface->net_dev->mtu, min_mtu);
 339         }
 340         rcu_read_unlock();
 341
 342         if (atomic_read(&bat_priv->fragmentation) == 0)
 343                 goto out;
 344
 345         /* with fragmentation enabled the maximum size of internally generated
 346          * packets such as translation table exchanges or tvlv containers, etc
 347          * has to be calculated
 348          */
 349         min_mtu = min_t(int, min_mtu, BATADV_FRAG_MAX_FRAG_SIZE);
 350         min_mtu -= sizeof(struct batadv_frag_packet);
 351         min_mtu *= BATADV_FRAG_MAX_FRAGMENTS;
 352
 353 out:
 354         /* report to the other components the maximum amount of bytes that
 355          * batman-adv can send over the wire (without considering the payload
 356          * overhead). For example, this value is used by TT to compute the
 357          * maximum local table table size
 358          */
 359         atomic_set(&bat_priv->packet_size_max, min_mtu);
 360
 361         /* the real soft-interface MTU is computed by removing the payload
 362          * overhead from the maximum amount of bytes that was just computed.
 363          *
 364          * However batman-adv does not support MTUs bigger than ETH_DATA_LEN
 365          */
 366         return min_t(int, min_mtu - batadv_max_header_len(), ETH_DATA_LEN);
 367 }
 368
 369 /* adjusts the MTU if a new interface with a smaller MTU appeared. */
 370 void batadv_update_min_mtu(struct net_device *soft_iface)
 371 {
 372         soft_iface->mtu = batadv_hardif_min_mtu(soft_iface);
 373
 374         /* Check if the local translate table should be cleaned up to match a
 375          * new (and smaller) MTU.
 376          */
 377         batadv_tt_local_resize_to_mtu(soft_iface);
 378 }
 379
 380 static void
 381 batadv_hardif_activate_interface(struct batadv_hard_iface *hard_iface)
 382 {
 383         struct batadv_priv *bat_priv;
 384         struct batadv_hard_iface *primary_if = NULL;
 385
 386         if (hard_iface->if_status != BATADV_IF_INACTIVE)
 387                 goto out;
 388
 389         bat_priv = netdev_priv(hard_iface->soft_iface);
 390
 391         bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface);
 392         hard_iface->if_status = BATADV_IF_TO_BE_ACTIVATED;
 393
 394         /* the first active interface becomes our primary interface or
 395          * the next active interface after the old primary interface was removed
 396          */
 397         primary_if = batadv_primary_if_get_selected(bat_priv);
 398         if (!primary_if)
 399                 batadv_primary_if_select(bat_priv, hard_iface);
 400
 401         batadv_info(hard_iface->soft_iface, "Interface activated: %s\n",
 402                     hard_iface->net_dev->name);
 403
 404         batadv_update_min_mtu(hard_iface->soft_iface);
 405
 406 out:
 407         if (primary_if)
 408                 batadv_hardif_free_ref(primary_if);
 409 }
 410
 411 static void
 412 batadv_hardif_deactivate_interface(struct batadv_hard_iface *hard_iface)
 413 {
 414         if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
 415             (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
 416                 return;
 417
 418         hard_iface->if_status = BATADV_IF_INACTIVE;
 419
 420         batadv_info(hard_iface->soft_iface, "Interface deactivated: %s\n",
 421                     hard_iface->net_dev->name);
 422
 423         batadv_update_min_mtu(hard_iface->soft_iface);
 424 }
 425
 426 /**
 427  * batadv_master_del_slave - remove hard_iface from the current master interface
 428  * @slave: the interface enslaved in another master
 429  * @master: the master from which slave has to be removed
 430  *
 431  * Invoke ndo_del_slave on master passing slave as argument. In this way slave
 432  * is free'd and master can correctly change its internal state.
 433  * Return 0 on success, a negative value representing the error otherwise
 434  */
 435 static int batadv_master_del_slave(struct batadv_hard_iface *slave,
 436                                    struct net_device *master)
 437 {
 438         int ret;
 439
 440         if (!master)
 441                 return 0;
 442
 443         ret = -EBUSY;
 444         if (master->netdev_ops->ndo_del_slave)
 445                 ret = master->netdev_ops->ndo_del_slave(master, slave->net_dev);
 446
 447         return ret;
 448 }
 449
 450 int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
 451                                    const char *iface_name)
 452 {
 453         struct batadv_priv *bat_priv;
 454         struct net_device *soft_iface, *master;
 455         __be16 ethertype = htons(ETH_P_BATMAN);
 456         int max_header_len = batadv_max_header_len();
 457         int ret;
 458
 459         if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
 460                 goto out;
 461
 462         if (!atomic_inc_not_zero(&hard_iface->refcount))
 463                 goto out;
 464
 465         soft_iface = dev_get_by_name(&init_net, iface_name);
 466
 467         if (!soft_iface) {
 468                 soft_iface = batadv_softif_create(iface_name);
 469
 470                 if (!soft_iface) {
 471                         ret = -ENOMEM;
 472                         goto err;
 473                 }
 474
 475                 /* dev_get_by_name() increases the reference counter for us */
 476                 dev_hold(soft_iface);
 477         }
 478
 479         if (!batadv_softif_is_valid(soft_iface)) {
 480                 pr_err("Can't create batman mesh interface %s: already exists as regular interface\n",
 481                        soft_iface->name);
 482                 ret = -EINVAL;
 483                 goto err_dev;
 484         }
 485
 486         /* check if the interface is enslaved in another virtual one and
 487          * in that case unlink it first
 488          */
 489         master = netdev_master_upper_dev_get(hard_iface->net_dev);
 490         ret = batadv_master_del_slave(hard_iface, master);
 491         if (ret)
 492                 goto err_dev;
 493
 494         hard_iface->soft_iface = soft_iface;
 495         bat_priv = netdev_priv(hard_iface->soft_iface);
 496
 497         if (bat_priv->num_ifaces >= UINT_MAX) {
 498                 ret = -ENOSPC;
 499                 goto err_dev;
 500         }
 501
 502         ret = netdev_master_upper_dev_link(hard_iface->net_dev, soft_iface);
 503         if (ret)
 504                 goto err_dev;
 505
 506         ret = bat_priv->bat_algo_ops->bat_iface_enable(hard_iface);
 507         if (ret < 0)
 508                 goto err_upper;
 509
 510         hard_iface->if_num = bat_priv->num_ifaces;
 511         bat_priv->num_ifaces++;
 512         hard_iface->if_status = BATADV_IF_INACTIVE;
 513         ret = batadv_orig_hash_add_if(hard_iface, bat_priv->num_ifaces);
 514         if (ret < 0) {
 515                 bat_priv->bat_algo_ops->bat_iface_disable(hard_iface);
 516                 bat_priv->num_ifaces--;
 517                 hard_iface->if_status = BATADV_IF_NOT_IN_USE;
 518                 goto err_upper;
 519         }
 520
 521         hard_iface->batman_adv_ptype.type = ethertype;
 522         hard_iface->batman_adv_ptype.func = batadv_batman_skb_recv;
 523         hard_iface->batman_adv_ptype.dev = hard_iface->net_dev;
 524         dev_add_pack(&hard_iface->batman_adv_ptype);
 525
 526         batadv_info(hard_iface->soft_iface, "Adding interface: %s\n",
 527                     hard_iface->net_dev->name);
 528
 529         if (atomic_read(&bat_priv->fragmentation) &&
 530             hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
 531                 batadv_info(hard_iface->soft_iface,
 532                             "The MTU of interface %s is too small (%i) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to %i would solve the problem.\n",
 533                             hard_iface->net_dev->name, hard_iface->net_dev->mtu,
 534                             ETH_DATA_LEN + max_header_len);
 535
 536         if (!atomic_read(&bat_priv->fragmentation) &&
 537             hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
 538                 batadv_info(hard_iface->soft_iface,
 539                             "The MTU of interface %s is too small (%i) to handle the transport of batman-adv packets. If you experience problems getting traffic through try increasing the MTU to %i.\n",
 540                             hard_iface->net_dev->name, hard_iface->net_dev->mtu,
 541                             ETH_DATA_LEN + max_header_len);
 542
 543         if (batadv_hardif_is_iface_up(hard_iface))
 544                 batadv_hardif_activate_interface(hard_iface);
 545         else
 546                 batadv_err(hard_iface->soft_iface,
 547                            "Not using interface %s (retrying later): interface not active\n",
 548                            hard_iface->net_dev->name);
 549
 550         batadv_hardif_recalc_extra_skbroom(soft_iface);
 551
 552         /* begin scheduling originator messages on that interface */
 553         batadv_schedule_bat_ogm(hard_iface);
 554
 555 out:
 556         return 0;
 557
 558 err_upper:
 559         netdev_upper_dev_unlink(hard_iface->net_dev, soft_iface);
 560 err_dev:
 561         hard_iface->soft_iface = NULL;
 562         dev_put(soft_iface);
 563 err:
 564         batadv_hardif_free_ref(hard_iface);
 565         return ret;
 566 }
 567
 568 void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface,
 569                                      enum batadv_hard_if_cleanup autodel)
 570 {
 571         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 572         struct batadv_hard_iface *primary_if = NULL;
 573
 574         batadv_hardif_deactivate_interface(hard_iface);
 575
 576         if (hard_iface->if_status != BATADV_IF_INACTIVE)
 577                 goto out;
 578
 579         batadv_info(hard_iface->soft_iface, "Removing interface: %s\n",
 580                     hard_iface->net_dev->name);
 581         dev_remove_pack(&hard_iface->batman_adv_ptype);
 582
 583         bat_priv->num_ifaces--;
 584         batadv_orig_hash_del_if(hard_iface, bat_priv->num_ifaces);
 585
 586         primary_if = batadv_primary_if_get_selected(bat_priv);
 587         if (hard_iface == primary_if) {
 588                 struct batadv_hard_iface *new_if;
 589
 590                 new_if = batadv_hardif_get_active(hard_iface->soft_iface);
 591                 batadv_primary_if_select(bat_priv, new_if);
 592
 593                 if (new_if)
 594                         batadv_hardif_free_ref(new_if);
 595         }
 596
 597         bat_priv->bat_algo_ops->bat_iface_disable(hard_iface);
 598         hard_iface->if_status = BATADV_IF_NOT_IN_USE;
 599
 600         /* delete all references to this hard_iface */
 601         batadv_purge_orig_ref(bat_priv);
 602         batadv_purge_outstanding_packets(bat_priv, hard_iface);
 603         dev_put(hard_iface->soft_iface);
 604
 605         netdev_upper_dev_unlink(hard_iface->net_dev, hard_iface->soft_iface);
 606         batadv_hardif_recalc_extra_skbroom(hard_iface->soft_iface);
 607
 608         /* nobody uses this interface anymore */
 609         if (bat_priv->num_ifaces == 0) {
 610                 batadv_gw_check_client_stop(bat_priv);
 611
 612                 if (autodel == BATADV_IF_CLEANUP_AUTO)
 613                         batadv_softif_destroy_sysfs(hard_iface->soft_iface);
 614         }
 615
 616         hard_iface->soft_iface = NULL;
 617         batadv_hardif_free_ref(hard_iface);
 618
 619 out:
 620         if (primary_if)
 621                 batadv_hardif_free_ref(primary_if);
 622 }
 623
 624 /**
 625  * batadv_hardif_remove_interface_finish - cleans up the remains of a hardif
 626  * @work: work queue item
 627  *
 628  * Free the parts of the hard interface which can not be removed under
 629  * rtnl lock (to prevent deadlock situations).
 630  */
 631 static void batadv_hardif_remove_interface_finish(struct work_struct *work)
 632 {
 633         struct batadv_hard_iface *hard_iface;
 634
 635         hard_iface = container_of(work, struct batadv_hard_iface,
 636                                   cleanup_work);
 637
 638         batadv_debugfs_del_hardif(hard_iface);
 639         batadv_sysfs_del_hardif(&hard_iface->hardif_obj);
 640         batadv_hardif_free_ref(hard_iface);
 641 }
 642
 643 static struct batadv_hard_iface *
 644 batadv_hardif_add_interface(struct net_device *net_dev)
 645 {
 646         struct batadv_hard_iface *hard_iface;
 647         int ret;
 648
 649         ASSERT_RTNL();
 650
 651         ret = batadv_is_valid_iface(net_dev);
 652         if (ret != 1)
 653                 goto out;
 654
 655         dev_hold(net_dev);
 656
 657         hard_iface = kzalloc(sizeof(*hard_iface), GFP_ATOMIC);
 658         if (!hard_iface)
 659                 goto release_dev;
 660
 661         ret = batadv_sysfs_add_hardif(&hard_iface->hardif_obj, net_dev);
 662         if (ret)
 663                 goto free_if;
 664
 665         hard_iface->if_num = 0;
 666         hard_iface->net_dev = net_dev;
 667         hard_iface->soft_iface = NULL;
 668         hard_iface->if_status = BATADV_IF_NOT_IN_USE;
 669
 670         ret = batadv_debugfs_add_hardif(hard_iface);
 671         if (ret)
 672                 goto free_sysfs;
 673
 674         INIT_LIST_HEAD(&hard_iface->list);
 675         mutex_init(&hard_iface->bat_iv.ogm_buff_mutex);
 676         INIT_WORK(&hard_iface->cleanup_work,
 677                   batadv_hardif_remove_interface_finish);
 678
 679         hard_iface->num_bcasts = BATADV_NUM_BCASTS_DEFAULT;
 680         if (batadv_is_wifi_netdev(net_dev))
 681                 hard_iface->num_bcasts = BATADV_NUM_BCASTS_WIRELESS;
 682
 683         /* extra reference for return */
 684         atomic_set(&hard_iface->refcount, 2);
 685
 686         batadv_check_known_mac_addr(hard_iface->net_dev);
 687         list_add_tail_rcu(&hard_iface->list, &batadv_hardif_list);
 688
 689         return hard_iface;
 690
 691 free_sysfs:
 692         batadv_sysfs_del_hardif(&hard_iface->hardif_obj);
 693 free_if:
 694         kfree(hard_iface);
 695 release_dev:
 696         dev_put(net_dev);
 697 out:
 698         return NULL;
 699 }
 700
 701 static void batadv_hardif_remove_interface(struct batadv_hard_iface *hard_iface)
 702 {
 703         ASSERT_RTNL();
 704
 705         /* first deactivate interface */
 706         if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
 707                 batadv_hardif_disable_interface(hard_iface,
 708                                                 BATADV_IF_CLEANUP_AUTO);
 709
 710         if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
 711                 return;
 712
 713         hard_iface->if_status = BATADV_IF_TO_BE_REMOVED;
 714         queue_work(batadv_event_workqueue, &hard_iface->cleanup_work);
 715 }
 716
 717 void batadv_hardif_remove_interfaces(void)
 718 {
 719         struct batadv_hard_iface *hard_iface, *hard_iface_tmp;
 720
 721         rtnl_lock();
 722         list_for_each_entry_safe(hard_iface, hard_iface_tmp,
 723                                  &batadv_hardif_list, list) {
 724                 list_del_rcu(&hard_iface->list);
 725                 batadv_hardif_remove_interface(hard_iface);
 726         }
 727         rtnl_unlock();
 728 }
 729
 730 /**
 731  * batadv_hard_if_event_softif() - Handle events for soft interfaces
 732  * @event: NETDEV_* event to handle
 733  * @net_dev: net_device which generated an event
 734  *
 735  * Return: NOTIFY_* result
 736  */
 737 static int batadv_hard_if_event_softif(unsigned long event,
 738                                        struct net_device *net_dev)
 739 {
 740         struct batadv_priv *bat_priv;
 741
 742         switch (event) {
 743         case NETDEV_REGISTER:
 744                 batadv_sysfs_add_meshif(net_dev);
 745                 bat_priv = netdev_priv(net_dev);
 746                 batadv_softif_create_vlan(bat_priv, BATADV_NO_FLAGS);
 747                 break;
 748         case NETDEV_CHANGENAME:
 749                 batadv_debugfs_rename_meshif(net_dev);
 750                 break;
 751         }
 752
 753         return NOTIFY_DONE;
 754 }
 755
 756 static int batadv_hard_if_event(struct notifier_block *this,
 757                                 unsigned long event, void *ptr)
 758 {
 759         struct net_device *net_dev = netdev_notifier_info_to_dev(ptr);
 760         struct batadv_hard_iface *hard_iface;
 761         struct batadv_hard_iface *primary_if = NULL;
 762         struct batadv_priv *bat_priv;
 763
 764         if (batadv_softif_is_valid(net_dev))
 765                 return batadv_hard_if_event_softif(event, net_dev);
 766
 767         hard_iface = batadv_hardif_get_by_netdev(net_dev);
 768         if (!hard_iface && event == NETDEV_REGISTER)
 769                 hard_iface = batadv_hardif_add_interface(net_dev);
 770
 771         if (!hard_iface)
 772                 goto out;
 773
 774         switch (event) {
 775         case NETDEV_UP:
 776                 batadv_hardif_activate_interface(hard_iface);
 777                 break;
 778         case NETDEV_GOING_DOWN:
 779         case NETDEV_DOWN:
 780                 batadv_hardif_deactivate_interface(hard_iface);
 781                 break;
 782         case NETDEV_UNREGISTER:
 783                 list_del_rcu(&hard_iface->list);
 784
 785                 batadv_hardif_remove_interface(hard_iface);
 786                 break;
 787         case NETDEV_CHANGEMTU:
 788                 if (hard_iface->soft_iface)
 789                         batadv_update_min_mtu(hard_iface->soft_iface);
 790                 break;
 791         case NETDEV_CHANGEADDR:
 792                 if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
 793                         goto hardif_put;
 794
 795                 batadv_check_known_mac_addr(hard_iface->net_dev);
 796
 797                 bat_priv = netdev_priv(hard_iface->soft_iface);
 798                 bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface);
 799
 800                 primary_if = batadv_primary_if_get_selected(bat_priv);
 801                 if (!primary_if)
 802                         goto hardif_put;
 803
 804                 if (hard_iface == primary_if)
 805                         batadv_primary_if_update_addr(bat_priv, NULL);
 806                 break;
 807         case NETDEV_CHANGENAME:
 808                 batadv_debugfs_rename_hardif(hard_iface);
 809                 break;
 810         default:
 811                 break;
 812         }
 813
 814 hardif_put:
 815         batadv_hardif_free_ref(hard_iface);
 816 out:
 817         if (primary_if)
 818                 batadv_hardif_free_ref(primary_if);
 819         return NOTIFY_DONE;
 820 }
 821
 822 struct notifier_block batadv_hard_if_notifier = {
 823         .notifier_call = batadv_hard_if_event,
 824 };