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