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