net/batman-adv/hard-interface.c

   1 /* Copyright (C) 2007-2016  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/atomic.h>
  22 #include <linux/bug.h>
  23 #include <linux/byteorder/generic.h>
  24 #include <linux/errno.h>
  25 #include <linux/fs.h>
  26 #include <linux/if.h>
  27 #include <linux/if_arp.h>
  28 #include <linux/if_ether.h>
  29 #include <linux/kernel.h>
  30 #include <linux/kref.h>
  31 #include <linux/list.h>
  32 #include <linux/netdevice.h>
  33 #include <linux/printk.h>
  34 #include <linux/rculist.h>
  35 #include <linux/rtnetlink.h>
  36 #include <linux/slab.h>
  37 #include <linux/spinlock.h>
  38 #include <net/net_namespace.h>
  39 #include <net/rtnetlink.h>
  40
  41 #include "bat_v.h"
  42 #include "bridge_loop_avoidance.h"
  43 #include "debugfs.h"
  44 #include "distributed-arp-table.h"
  45 #include "gateway_client.h"
  46 #include "log.h"
  47 #include "originator.h"
  48 #include "packet.h"
  49 #include "send.h"
  50 #include "soft-interface.h"
  51 #include "sysfs.h"
  52 #include "translation-table.h"
  53
  54 /**
  55  * batadv_hardif_release - release hard interface from lists and queue for
  56  *  free after rcu grace period
  57  * @ref: kref pointer of the hard interface
  58  */
  59 void batadv_hardif_release(struct kref *ref)
  60 {
  61         struct batadv_hard_iface *hard_iface;
  62
  63         hard_iface = container_of(ref, struct batadv_hard_iface, refcount);
  64         dev_put(hard_iface->net_dev);
  65
  66         kfree_rcu(hard_iface, rcu);
  67 }
  68
  69 struct batadv_hard_iface *
  70 batadv_hardif_get_by_netdev(const struct net_device *net_dev)
  71 {
  72         struct batadv_hard_iface *hard_iface;
  73
  74         rcu_read_lock();
  75         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
  76                 if (hard_iface->net_dev == net_dev &&
  77                     kref_get_unless_zero(&hard_iface->refcount))
  78                         goto out;
  79         }
  80
  81         hard_iface = NULL;
  82
  83 out:
  84         rcu_read_unlock();
  85         return hard_iface;
  86 }
  87
  88 /**
  89  * batadv_getlink_net - return link net namespace (of use fallback)
  90  * @netdev: net_device to check
  91  * @fallback_net: return in case get_link_net is not available for @netdev
  92  *
  93  * Return: result of rtnl_link_ops->get_link_net or @fallback_net
  94  */
  95 static const struct net *batadv_getlink_net(const struct net_device *netdev,
  96                                             const struct net *fallback_net)
  97 {
  98         if (!netdev->rtnl_link_ops)
  99                 return fallback_net;
 100
 101         if (!netdev->rtnl_link_ops->get_link_net)
 102                 return fallback_net;
 103
 104         return netdev->rtnl_link_ops->get_link_net(netdev);
 105 }
 106
 107 /**
 108  * batadv_mutual_parents - check if two devices are each others parent
 109  * @dev1: 1st net dev
 110  * @net1: 1st devices netns
 111  * @dev2: 2nd net dev
 112  * @net2: 2nd devices netns
 113  *
 114  * veth devices come in pairs and each is the parent of the other!
 115  *
 116  * Return: true if the devices are each others parent, otherwise false
 117  */
 118 static bool batadv_mutual_parents(const struct net_device *dev1,
 119                                   const struct net *net1,
 120                                   const struct net_device *dev2,
 121                                   const struct net *net2)
 122 {
 123         int dev1_parent_iflink = dev_get_iflink(dev1);
 124         int dev2_parent_iflink = dev_get_iflink(dev2);
 125         const struct net *dev1_parent_net;
 126         const struct net *dev2_parent_net;
 127
 128         dev1_parent_net = batadv_getlink_net(dev1, net1);
 129         dev2_parent_net = batadv_getlink_net(dev2, net2);
 130
 131         if (!dev1_parent_iflink || !dev2_parent_iflink)
 132                 return false;
 133
 134         return (dev1_parent_iflink == dev2->ifindex) &&
 135                (dev2_parent_iflink == dev1->ifindex) &&
 136                net_eq(dev1_parent_net, net2) &&
 137                net_eq(dev2_parent_net, net1);
 138 }
 139
 140 /**
 141  * batadv_is_on_batman_iface - check if a device is a batman iface descendant
 142  * @net_dev: the device to check
 143  *
 144  * If the user creates any virtual device on top of a batman-adv interface, it
 145  * is important to prevent this new interface to be used to create a new mesh
 146  * network (this behaviour would lead to a batman-over-batman configuration).
 147  * This function recursively checks all the fathers of the device passed as
 148  * argument looking for a batman-adv soft interface.
 149  *
 150  * Return: true if the device is descendant of a batman-adv mesh interface (or
 151  * if it is a batman-adv interface itself), false otherwise
 152  */
 153 static bool batadv_is_on_batman_iface(const struct net_device *net_dev)
 154 {
 155         struct net *net = dev_net(net_dev);
 156         struct net_device *parent_dev;
 157         const struct net *parent_net;
 158         bool ret;
 159
 160         /* check if this is a batman-adv mesh interface */
 161         if (batadv_softif_is_valid(net_dev))
 162                 return true;
 163
 164         /* no more parents..stop recursion */
 165         if (dev_get_iflink(net_dev) == 0 ||
 166             dev_get_iflink(net_dev) == net_dev->ifindex)
 167                 return false;
 168
 169         parent_net = batadv_getlink_net(net_dev, net);
 170
 171         /* recurse over the parent device */
 172         parent_dev = __dev_get_by_index((struct net *)parent_net,
 173                                         dev_get_iflink(net_dev));
 174         /* if we got a NULL parent_dev there is something broken.. */
 175         if (WARN(!parent_dev, "Cannot find parent device"))
 176                 return false;
 177
 178         if (batadv_mutual_parents(net_dev, net, parent_dev, parent_net))
 179                 return false;
 180
 181         ret = batadv_is_on_batman_iface(parent_dev);
 182
 183         return ret;
 184 }
 185
 186 static bool batadv_is_valid_iface(const struct net_device *net_dev)
 187 {
 188         if (net_dev->flags & IFF_LOOPBACK)
 189                 return false;
 190
 191         if (net_dev->type != ARPHRD_ETHER)
 192                 return false;
 193
 194         if (net_dev->addr_len != ETH_ALEN)
 195                 return false;
 196
 197         /* no batman over batman */
 198         if (batadv_is_on_batman_iface(net_dev))
 199                 return false;
 200
 201         return true;
 202 }
 203
 204 /**
 205  * batadv_is_wifi_netdev - check if the given net_device struct is a wifi
 206  *  interface
 207  * @net_device: the device to check
 208  *
 209  * Return: true if the net device is a 802.11 wireless device, false otherwise.
 210  */
 211 bool batadv_is_wifi_netdev(struct net_device *net_device)
 212 {
 213         if (!net_device)
 214                 return false;
 215
 216 #ifdef CONFIG_WIRELESS_EXT
 217         /* pre-cfg80211 drivers have to implement WEXT, so it is possible to
 218          * check for wireless_handlers != NULL
 219          */
 220         if (net_device->wireless_handlers)
 221                 return true;
 222 #endif
 223
 224         /* cfg80211 drivers have to set ieee80211_ptr */
 225         if (net_device->ieee80211_ptr)
 226                 return true;
 227
 228         return false;
 229 }
 230
 231 static struct batadv_hard_iface *
 232 batadv_hardif_get_active(const struct net_device *soft_iface)
 233 {
 234         struct batadv_hard_iface *hard_iface;
 235
 236         rcu_read_lock();
 237         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
 238                 if (hard_iface->soft_iface != soft_iface)
 239                         continue;
 240
 241                 if (hard_iface->if_status == BATADV_IF_ACTIVE &&
 242                     kref_get_unless_zero(&hard_iface->refcount))
 243                         goto out;
 244         }
 245
 246         hard_iface = NULL;
 247
 248 out:
 249         rcu_read_unlock();
 250         return hard_iface;
 251 }
 252
 253 static void batadv_primary_if_update_addr(struct batadv_priv *bat_priv,
 254                                           struct batadv_hard_iface *oldif)
 255 {
 256         struct batadv_hard_iface *primary_if;
 257
 258         primary_if = batadv_primary_if_get_selected(bat_priv);
 259         if (!primary_if)
 260                 goto out;
 261
 262         batadv_dat_init_own_addr(bat_priv, primary_if);
 263         batadv_bla_update_orig_address(bat_priv, primary_if, oldif);
 264 out:
 265         if (primary_if)
 266                 batadv_hardif_put(primary_if);
 267 }
 268
 269 static void batadv_primary_if_select(struct batadv_priv *bat_priv,
 270                                      struct batadv_hard_iface *new_hard_iface)
 271 {
 272         struct batadv_hard_iface *curr_hard_iface;
 273
 274         ASSERT_RTNL();
 275
 276         if (new_hard_iface)
 277                 kref_get(&new_hard_iface->refcount);
 278
 279         curr_hard_iface = rcu_dereference_protected(bat_priv->primary_if, 1);
 280         rcu_assign_pointer(bat_priv->primary_if, new_hard_iface);
 281
 282         if (!new_hard_iface)
 283                 goto out;
 284
 285         bat_priv->algo_ops->iface.primary_set(new_hard_iface);
 286         batadv_primary_if_update_addr(bat_priv, curr_hard_iface);
 287
 288 out:
 289         if (curr_hard_iface)
 290                 batadv_hardif_put(curr_hard_iface);
 291 }
 292
 293 static bool
 294 batadv_hardif_is_iface_up(const struct batadv_hard_iface *hard_iface)
 295 {
 296         if (hard_iface->net_dev->flags & IFF_UP)
 297                 return true;
 298
 299         return false;
 300 }
 301
 302 static void batadv_check_known_mac_addr(const struct net_device *net_dev)
 303 {
 304         const struct batadv_hard_iface *hard_iface;
 305
 306         rcu_read_lock();
 307         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
 308                 if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
 309                     (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
 310                         continue;
 311
 312                 if (hard_iface->net_dev == net_dev)
 313                         continue;
 314
 315                 if (!batadv_compare_eth(hard_iface->net_dev->dev_addr,
 316                                         net_dev->dev_addr))
 317                         continue;
 318
 319                 pr_warn("The newly added mac address (%pM) already exists on: %s\n",
 320                         net_dev->dev_addr, hard_iface->net_dev->name);
 321                 pr_warn("It is strongly recommended to keep mac addresses unique to avoid problems!\n");
 322         }
 323         rcu_read_unlock();
 324 }
 325
 326 /**
 327  * batadv_hardif_recalc_extra_skbroom() - Recalculate skbuff extra head/tailroom
 328  * @soft_iface: netdev struct of the mesh interface
 329  */
 330 static void batadv_hardif_recalc_extra_skbroom(struct net_device *soft_iface)
 331 {
 332         const struct batadv_hard_iface *hard_iface;
 333         unsigned short lower_header_len = ETH_HLEN;
 334         unsigned short lower_headroom = 0;
 335         unsigned short lower_tailroom = 0;
 336         unsigned short needed_headroom;
 337
 338         rcu_read_lock();
 339         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
 340                 if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
 341                         continue;
 342
 343                 if (hard_iface->soft_iface != soft_iface)
 344                         continue;
 345
 346                 lower_header_len = max_t(unsigned short, lower_header_len,
 347                                          hard_iface->net_dev->hard_header_len);
 348
 349                 lower_headroom = max_t(unsigned short, lower_headroom,
 350                                        hard_iface->net_dev->needed_headroom);
 351
 352                 lower_tailroom = max_t(unsigned short, lower_tailroom,
 353                                        hard_iface->net_dev->needed_tailroom);
 354         }
 355         rcu_read_unlock();
 356
 357         needed_headroom = lower_headroom + (lower_header_len - ETH_HLEN);
 358         needed_headroom += batadv_max_header_len();
 359
 360         soft_iface->needed_headroom = needed_headroom;
 361         soft_iface->needed_tailroom = lower_tailroom;
 362 }
 363
 364 int batadv_hardif_min_mtu(struct net_device *soft_iface)
 365 {
 366         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 367         const struct batadv_hard_iface *hard_iface;
 368         int min_mtu = INT_MAX;
 369
 370         rcu_read_lock();
 371         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
 372                 if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
 373                     (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
 374                         continue;
 375
 376                 if (hard_iface->soft_iface != soft_iface)
 377                         continue;
 378
 379                 min_mtu = min_t(int, hard_iface->net_dev->mtu, min_mtu);
 380         }
 381         rcu_read_unlock();
 382
 383         if (atomic_read(&bat_priv->fragmentation) == 0)
 384                 goto out;
 385
 386         /* with fragmentation enabled the maximum size of internally generated
 387          * packets such as translation table exchanges or tvlv containers, etc
 388          * has to be calculated
 389          */
 390         min_mtu = min_t(int, min_mtu, BATADV_FRAG_MAX_FRAG_SIZE);
 391         min_mtu -= sizeof(struct batadv_frag_packet);
 392         min_mtu *= BATADV_FRAG_MAX_FRAGMENTS;
 393
 394 out:
 395         /* report to the other components the maximum amount of bytes that
 396          * batman-adv can send over the wire (without considering the payload
 397          * overhead). For example, this value is used by TT to compute the
 398          * maximum local table table size
 399          */
 400         atomic_set(&bat_priv->packet_size_max, min_mtu);
 401
 402         /* the real soft-interface MTU is computed by removing the payload
 403          * overhead from the maximum amount of bytes that was just computed.
 404          *
 405          * However batman-adv does not support MTUs bigger than ETH_DATA_LEN
 406          */
 407         return min_t(int, min_mtu - batadv_max_header_len(), ETH_DATA_LEN);
 408 }
 409
 410 /* adjusts the MTU if a new interface with a smaller MTU appeared. */
 411 void batadv_update_min_mtu(struct net_device *soft_iface)
 412 {
 413         soft_iface->mtu = batadv_hardif_min_mtu(soft_iface);
 414
 415         /* Check if the local translate table should be cleaned up to match a
 416          * new (and smaller) MTU.
 417          */
 418         batadv_tt_local_resize_to_mtu(soft_iface);
 419 }
 420
 421 static void
 422 batadv_hardif_activate_interface(struct batadv_hard_iface *hard_iface)
 423 {
 424         struct batadv_priv *bat_priv;
 425         struct batadv_hard_iface *primary_if = NULL;
 426
 427         if (hard_iface->if_status != BATADV_IF_INACTIVE)
 428                 goto out;
 429
 430         bat_priv = netdev_priv(hard_iface->soft_iface);
 431
 432         bat_priv->algo_ops->iface.update_mac(hard_iface);
 433         hard_iface->if_status = BATADV_IF_TO_BE_ACTIVATED;
 434
 435         /* the first active interface becomes our primary interface or
 436          * the next active interface after the old primary interface was removed
 437          */
 438         primary_if = batadv_primary_if_get_selected(bat_priv);
 439         if (!primary_if)
 440                 batadv_primary_if_select(bat_priv, hard_iface);
 441
 442         batadv_info(hard_iface->soft_iface, "Interface activated: %s\n",
 443                     hard_iface->net_dev->name);
 444
 445         batadv_update_min_mtu(hard_iface->soft_iface);
 446
 447         if (bat_priv->algo_ops->iface.activate)
 448                 bat_priv->algo_ops->iface.activate(hard_iface);
 449
 450 out:
 451         if (primary_if)
 452                 batadv_hardif_put(primary_if);
 453 }
 454
 455 static void
 456 batadv_hardif_deactivate_interface(struct batadv_hard_iface *hard_iface)
 457 {
 458         if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
 459             (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
 460                 return;
 461
 462         hard_iface->if_status = BATADV_IF_INACTIVE;
 463
 464         batadv_info(hard_iface->soft_iface, "Interface deactivated: %s\n",
 465                     hard_iface->net_dev->name);
 466
 467         batadv_update_min_mtu(hard_iface->soft_iface);
 468 }
 469
 470 /**
 471  * batadv_master_del_slave - remove hard_iface from the current master interface
 472  * @slave: the interface enslaved in another master
 473  * @master: the master from which slave has to be removed
 474  *
 475  * Invoke ndo_del_slave on master passing slave as argument. In this way slave
 476  * is free'd and master can correctly change its internal state.
 477  *
 478  * Return: 0 on success, a negative value representing the error otherwise
 479  */
 480 static int batadv_master_del_slave(struct batadv_hard_iface *slave,
 481                                    struct net_device *master)
 482 {
 483         int ret;
 484
 485         if (!master)
 486                 return 0;
 487
 488         ret = -EBUSY;
 489         if (master->netdev_ops->ndo_del_slave)
 490                 ret = master->netdev_ops->ndo_del_slave(master, slave->net_dev);
 491
 492         return ret;
 493 }
 494
 495 int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
 496                                    struct net *net, const char *iface_name)
 497 {
 498         struct batadv_priv *bat_priv;
 499         struct net_device *soft_iface, *master;
 500         __be16 ethertype = htons(ETH_P_BATMAN);
 501         int max_header_len = batadv_max_header_len();
 502         int ret;
 503
 504         if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
 505                 goto out;
 506
 507         kref_get(&hard_iface->refcount);
 508
 509         soft_iface = dev_get_by_name(net, iface_name);
 510
 511         if (!soft_iface) {
 512                 soft_iface = batadv_softif_create(net, iface_name);
 513
 514                 if (!soft_iface) {
 515                         ret = -ENOMEM;
 516                         goto err;
 517                 }
 518
 519                 /* dev_get_by_name() increases the reference counter for us */
 520                 dev_hold(soft_iface);
 521         }
 522
 523         if (!batadv_softif_is_valid(soft_iface)) {
 524                 pr_err("Can't create batman mesh interface %s: already exists as regular interface\n",
 525                        soft_iface->name);
 526                 ret = -EINVAL;
 527                 goto err_dev;
 528         }
 529
 530         /* check if the interface is enslaved in another virtual one and
 531          * in that case unlink it first
 532          */
 533         master = netdev_master_upper_dev_get(hard_iface->net_dev);
 534         ret = batadv_master_del_slave(hard_iface, master);
 535         if (ret)
 536                 goto err_dev;
 537
 538         hard_iface->soft_iface = soft_iface;
 539         bat_priv = netdev_priv(hard_iface->soft_iface);
 540
 541         ret = netdev_master_upper_dev_link(hard_iface->net_dev,
 542                                            soft_iface, NULL, NULL);
 543         if (ret)
 544                 goto err_dev;
 545
 546         ret = bat_priv->algo_ops->iface.enable(hard_iface);
 547         if (ret < 0)
 548                 goto err_upper;
 549
 550         hard_iface->if_num = bat_priv->num_ifaces;
 551         bat_priv->num_ifaces++;
 552         hard_iface->if_status = BATADV_IF_INACTIVE;
 553         ret = batadv_orig_hash_add_if(hard_iface, bat_priv->num_ifaces);
 554         if (ret < 0) {
 555                 bat_priv->algo_ops->iface.disable(hard_iface);
 556                 bat_priv->num_ifaces--;
 557                 hard_iface->if_status = BATADV_IF_NOT_IN_USE;
 558                 goto err_upper;
 559         }
 560
 561         kref_get(&hard_iface->refcount);
 562         hard_iface->batman_adv_ptype.type = ethertype;
 563         hard_iface->batman_adv_ptype.func = batadv_batman_skb_recv;
 564         hard_iface->batman_adv_ptype.dev = hard_iface->net_dev;
 565         dev_add_pack(&hard_iface->batman_adv_ptype);
 566
 567         batadv_info(hard_iface->soft_iface, "Adding interface: %s\n",
 568                     hard_iface->net_dev->name);
 569
 570         if (atomic_read(&bat_priv->fragmentation) &&
 571             hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
 572                 batadv_info(hard_iface->soft_iface,
 573                             "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",
 574                             hard_iface->net_dev->name, hard_iface->net_dev->mtu,
 575                             ETH_DATA_LEN + max_header_len);
 576
 577         if (!atomic_read(&bat_priv->fragmentation) &&
 578             hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
 579                 batadv_info(hard_iface->soft_iface,
 580                             "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",
 581                             hard_iface->net_dev->name, hard_iface->net_dev->mtu,
 582                             ETH_DATA_LEN + max_header_len);
 583
 584         if (batadv_hardif_is_iface_up(hard_iface))
 585                 batadv_hardif_activate_interface(hard_iface);
 586         else
 587                 batadv_err(hard_iface->soft_iface,
 588                            "Not using interface %s (retrying later): interface not active\n",
 589                            hard_iface->net_dev->name);
 590
 591         batadv_hardif_recalc_extra_skbroom(soft_iface);
 592
 593 out:
 594         return 0;
 595
 596 err_upper:
 597         netdev_upper_dev_unlink(hard_iface->net_dev, soft_iface);
 598 err_dev:
 599         hard_iface->soft_iface = NULL;
 600         dev_put(soft_iface);
 601 err:
 602         batadv_hardif_put(hard_iface);
 603         return ret;
 604 }
 605
 606 void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface,
 607                                      enum batadv_hard_if_cleanup autodel)
 608 {
 609         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 610         struct batadv_hard_iface *primary_if = NULL;
 611
 612         batadv_hardif_deactivate_interface(hard_iface);
 613
 614         if (hard_iface->if_status != BATADV_IF_INACTIVE)
 615                 goto out;
 616
 617         batadv_info(hard_iface->soft_iface, "Removing interface: %s\n",
 618                     hard_iface->net_dev->name);
 619         dev_remove_pack(&hard_iface->batman_adv_ptype);
 620         batadv_hardif_put(hard_iface);
 621
 622         bat_priv->num_ifaces--;
 623         batadv_orig_hash_del_if(hard_iface, bat_priv->num_ifaces);
 624
 625         primary_if = batadv_primary_if_get_selected(bat_priv);
 626         if (hard_iface == primary_if) {
 627                 struct batadv_hard_iface *new_if;
 628
 629                 new_if = batadv_hardif_get_active(hard_iface->soft_iface);
 630                 batadv_primary_if_select(bat_priv, new_if);
 631
 632                 if (new_if)
 633                         batadv_hardif_put(new_if);
 634         }
 635
 636         bat_priv->algo_ops->iface.disable(hard_iface);
 637         hard_iface->if_status = BATADV_IF_NOT_IN_USE;
 638
 639         /* delete all references to this hard_iface */
 640         batadv_purge_orig_ref(bat_priv);
 641         batadv_purge_outstanding_packets(bat_priv, hard_iface);
 642         dev_put(hard_iface->soft_iface);
 643
 644         netdev_upper_dev_unlink(hard_iface->net_dev, hard_iface->soft_iface);
 645         batadv_hardif_recalc_extra_skbroom(hard_iface->soft_iface);
 646
 647         /* nobody uses this interface anymore */
 648         if (!bat_priv->num_ifaces) {
 649                 batadv_gw_check_client_stop(bat_priv);
 650
 651                 if (autodel == BATADV_IF_CLEANUP_AUTO)
 652                         batadv_softif_destroy_sysfs(hard_iface->soft_iface);
 653         }
 654
 655         batadv_hardif_put(hard_iface);
 656
 657 out:
 658         if (primary_if)
 659                 batadv_hardif_put(primary_if);
 660 }
 661
 662 static struct batadv_hard_iface *
 663 batadv_hardif_add_interface(struct net_device *net_dev)
 664 {
 665         struct batadv_hard_iface *hard_iface;
 666         int ret;
 667
 668         ASSERT_RTNL();
 669
 670         if (!batadv_is_valid_iface(net_dev))
 671                 goto out;
 672
 673         dev_hold(net_dev);
 674
 675         hard_iface = kzalloc(sizeof(*hard_iface), GFP_ATOMIC);
 676         if (!hard_iface)
 677                 goto release_dev;
 678
 679         ret = batadv_sysfs_add_hardif(&hard_iface->hardif_obj, net_dev);
 680         if (ret)
 681                 goto free_if;
 682
 683         hard_iface->if_num = -1;
 684         hard_iface->net_dev = net_dev;
 685         hard_iface->soft_iface = NULL;
 686         hard_iface->if_status = BATADV_IF_NOT_IN_USE;
 687
 688         ret = batadv_debugfs_add_hardif(hard_iface);
 689         if (ret)
 690                 goto free_sysfs;
 691
 692         INIT_LIST_HEAD(&hard_iface->list);
 693         INIT_HLIST_HEAD(&hard_iface->neigh_list);
 694
 695         spin_lock_init(&hard_iface->neigh_list_lock);
 696         kref_init(&hard_iface->refcount);
 697
 698         hard_iface->num_bcasts = BATADV_NUM_BCASTS_DEFAULT;
 699         if (batadv_is_wifi_netdev(net_dev))
 700                 hard_iface->num_bcasts = BATADV_NUM_BCASTS_WIRELESS;
 701
 702         batadv_v_hardif_init(hard_iface);
 703
 704         batadv_check_known_mac_addr(hard_iface->net_dev);
 705         kref_get(&hard_iface->refcount);
 706         list_add_tail_rcu(&hard_iface->list, &batadv_hardif_list);
 707
 708         return hard_iface;
 709
 710 free_sysfs:
 711         batadv_sysfs_del_hardif(&hard_iface->hardif_obj);
 712 free_if:
 713         kfree(hard_iface);
 714 release_dev:
 715         dev_put(net_dev);
 716 out:
 717         return NULL;
 718 }
 719
 720 static void batadv_hardif_remove_interface(struct batadv_hard_iface *hard_iface)
 721 {
 722         ASSERT_RTNL();
 723
 724         /* first deactivate interface */
 725         if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
 726                 batadv_hardif_disable_interface(hard_iface,
 727                                                 BATADV_IF_CLEANUP_KEEP);
 728
 729         if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
 730                 return;
 731
 732         hard_iface->if_status = BATADV_IF_TO_BE_REMOVED;
 733         batadv_debugfs_del_hardif(hard_iface);
 734         batadv_sysfs_del_hardif(&hard_iface->hardif_obj);
 735         batadv_hardif_put(hard_iface);
 736 }
 737
 738 void batadv_hardif_remove_interfaces(void)
 739 {
 740         struct batadv_hard_iface *hard_iface, *hard_iface_tmp;
 741
 742         rtnl_lock();
 743         list_for_each_entry_safe(hard_iface, hard_iface_tmp,
 744                                  &batadv_hardif_list, list) {
 745                 list_del_rcu(&hard_iface->list);
 746                 batadv_hardif_remove_interface(hard_iface);
 747         }
 748         rtnl_unlock();
 749 }
 750
 751 static int batadv_hard_if_event(struct notifier_block *this,
 752                                 unsigned long event, void *ptr)
 753 {
 754         struct net_device *net_dev = netdev_notifier_info_to_dev(ptr);
 755         struct batadv_hard_iface *hard_iface;
 756         struct batadv_hard_iface *primary_if = NULL;
 757         struct batadv_priv *bat_priv;
 758
 759         if (batadv_softif_is_valid(net_dev) && event == NETDEV_REGISTER) {
 760                 batadv_sysfs_add_meshif(net_dev);
 761                 bat_priv = netdev_priv(net_dev);
 762                 batadv_softif_create_vlan(bat_priv, BATADV_NO_FLAGS);
 763                 return NOTIFY_DONE;
 764         }
 765
 766         hard_iface = batadv_hardif_get_by_netdev(net_dev);
 767         if (!hard_iface && (event == NETDEV_REGISTER ||
 768                             event == NETDEV_POST_TYPE_CHANGE))
 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         case NETDEV_PRE_TYPE_CHANGE:
 784                 list_del_rcu(&hard_iface->list);
 785
 786                 batadv_hardif_remove_interface(hard_iface);
 787                 break;
 788         case NETDEV_CHANGEMTU:
 789                 if (hard_iface->soft_iface)
 790                         batadv_update_min_mtu(hard_iface->soft_iface);
 791                 break;
 792         case NETDEV_CHANGEADDR:
 793                 if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
 794                         goto hardif_put;
 795
 796                 batadv_check_known_mac_addr(hard_iface->net_dev);
 797
 798                 bat_priv = netdev_priv(hard_iface->soft_iface);
 799                 bat_priv->algo_ops->iface.update_mac(hard_iface);
 800
 801                 primary_if = batadv_primary_if_get_selected(bat_priv);
 802                 if (!primary_if)
 803                         goto hardif_put;
 804
 805                 if (hard_iface == primary_if)
 806                         batadv_primary_if_update_addr(bat_priv, NULL);
 807                 break;
 808         default:
 809                 break;
 810         }
 811
 812 hardif_put:
 813         batadv_hardif_put(hard_iface);
 814 out:
 815         if (primary_if)
 816                 batadv_hardif_put(primary_if);
 817         return NOTIFY_DONE;
 818 }
 819
 820 struct notifier_block batadv_hard_if_notifier = {
 821         .notifier_call = batadv_hard_if_event,
 822 };