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TOMOYO Linux Cross Reference
Linux/net/batman-adv/hard-interface.c

Version: ~ [ linux-5.5-rc7 ] ~ [ linux-5.4.13 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.97 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.166 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.210 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.210 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.81 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
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  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_arp.h>
 27 #include <linux/if_ether.h>
 28 #include <linux/if.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 #include <net/net_namespace.h>
 40 
 41 #include "bridge_loop_avoidance.h"
 42 #include "debugfs.h"
 43 #include "distributed-arp-table.h"
 44 #include "gateway_client.h"
 45 #include "originator.h"
 46 #include "packet.h"
 47 #include "send.h"
 48 #include "soft-interface.h"
 49 #include "sysfs.h"
 50 #include "translation-table.h"
 51 
 52 /**
 53  * batadv_hardif_release - release hard interface from lists and queue for
 54  *  free after rcu grace period
 55  * @ref: kref pointer of the hard interface
 56  */
 57 void batadv_hardif_release(struct kref *ref)
 58 {
 59         struct batadv_hard_iface *hard_iface;
 60 
 61         hard_iface = container_of(ref, struct batadv_hard_iface, refcount);
 62         dev_put(hard_iface->net_dev);
 63 
 64         kfree_rcu(hard_iface, rcu);
 65 }
 66 
 67 struct batadv_hard_iface *
 68 batadv_hardif_get_by_netdev(const struct net_device *net_dev)
 69 {
 70         struct batadv_hard_iface *hard_iface;
 71 
 72         rcu_read_lock();
 73         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
 74                 if (hard_iface->net_dev == net_dev &&
 75                     kref_get_unless_zero(&hard_iface->refcount))
 76                         goto out;
 77         }
 78 
 79         hard_iface = NULL;
 80 
 81 out:
 82         rcu_read_unlock();
 83         return hard_iface;
 84 }
 85 
 86 /**
 87  * batadv_mutual_parents - check if two devices are each others parent
 88  * @dev1: 1st net_device
 89  * @dev2: 2nd net_device
 90  *
 91  * veth devices come in pairs and each is the parent of the other!
 92  *
 93  * Return: true if the devices are each others parent, otherwise false
 94  */
 95 static bool batadv_mutual_parents(const struct net_device *dev1,
 96                                   const struct net_device *dev2)
 97 {
 98         int dev1_parent_iflink = dev_get_iflink(dev1);
 99         int dev2_parent_iflink = dev_get_iflink(dev2);
100 
101         if (!dev1_parent_iflink || !dev2_parent_iflink)
102                 return false;
103 
104         return (dev1_parent_iflink == dev2->ifindex) &&
105                (dev2_parent_iflink == dev1->ifindex);
106 }
107 
108 /**
109  * batadv_is_on_batman_iface - check if a device is a batman iface descendant
110  * @net_dev: the device to check
111  *
112  * If the user creates any virtual device on top of a batman-adv interface, it
113  * is important to prevent this new interface to be used to create a new mesh
114  * network (this behaviour would lead to a batman-over-batman configuration).
115  * This function recursively checks all the fathers of the device passed as
116  * argument looking for a batman-adv soft interface.
117  *
118  * Return: true if the device is descendant of a batman-adv mesh interface (or
119  * if it is a batman-adv interface itself), false otherwise
120  */
121 static bool batadv_is_on_batman_iface(const struct net_device *net_dev)
122 {
123         struct net_device *parent_dev;
124         bool ret;
125 
126         /* check if this is a batman-adv mesh interface */
127         if (batadv_softif_is_valid(net_dev))
128                 return true;
129 
130         /* no more parents..stop recursion */
131         if (dev_get_iflink(net_dev) == 0 ||
132             dev_get_iflink(net_dev) == net_dev->ifindex)
133                 return false;
134 
135         /* recurse over the parent device */
136         parent_dev = __dev_get_by_index(&init_net, dev_get_iflink(net_dev));
137         /* if we got a NULL parent_dev there is something broken.. */
138         if (WARN(!parent_dev, "Cannot find parent device"))
139                 return false;
140 
141         if (batadv_mutual_parents(net_dev, parent_dev))
142                 return false;
143 
144         ret = batadv_is_on_batman_iface(parent_dev);
145 
146         return ret;
147 }
148 
149 static int batadv_is_valid_iface(const struct net_device *net_dev)
150 {
151         if (net_dev->flags & IFF_LOOPBACK)
152                 return 0;
153 
154         if (net_dev->type != ARPHRD_ETHER)
155                 return 0;
156 
157         if (net_dev->addr_len != ETH_ALEN)
158                 return 0;
159 
160         /* no batman over batman */
161         if (batadv_is_on_batman_iface(net_dev))
162                 return 0;
163 
164         return 1;
165 }
166 
167 /**
168  * batadv_is_wifi_netdev - check if the given net_device struct is a wifi
169  *  interface
170  * @net_device: the device to check
171  *
172  * Return: true if the net device is a 802.11 wireless device, false otherwise.
173  */
174 bool batadv_is_wifi_netdev(struct net_device *net_device)
175 {
176         if (!net_device)
177                 return false;
178 
179 #ifdef CONFIG_WIRELESS_EXT
180         /* pre-cfg80211 drivers have to implement WEXT, so it is possible to
181          * check for wireless_handlers != NULL
182          */
183         if (net_device->wireless_handlers)
184                 return true;
185 #endif
186 
187         /* cfg80211 drivers have to set ieee80211_ptr */
188         if (net_device->ieee80211_ptr)
189                 return true;
190 
191         return false;
192 }
193 
194 static struct batadv_hard_iface *
195 batadv_hardif_get_active(const struct net_device *soft_iface)
196 {
197         struct batadv_hard_iface *hard_iface;
198 
199         rcu_read_lock();
200         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
201                 if (hard_iface->soft_iface != soft_iface)
202                         continue;
203 
204                 if (hard_iface->if_status == BATADV_IF_ACTIVE &&
205                     kref_get_unless_zero(&hard_iface->refcount))
206                         goto out;
207         }
208 
209         hard_iface = NULL;
210 
211 out:
212         rcu_read_unlock();
213         return hard_iface;
214 }
215 
216 static void batadv_primary_if_update_addr(struct batadv_priv *bat_priv,
217                                           struct batadv_hard_iface *oldif)
218 {
219         struct batadv_hard_iface *primary_if;
220 
221         primary_if = batadv_primary_if_get_selected(bat_priv);
222         if (!primary_if)
223                 goto out;
224 
225         batadv_dat_init_own_addr(bat_priv, primary_if);
226         batadv_bla_update_orig_address(bat_priv, primary_if, oldif);
227 out:
228         if (primary_if)
229                 batadv_hardif_put(primary_if);
230 }
231 
232 static void batadv_primary_if_select(struct batadv_priv *bat_priv,
233                                      struct batadv_hard_iface *new_hard_iface)
234 {
235         struct batadv_hard_iface *curr_hard_iface;
236 
237         ASSERT_RTNL();
238 
239         if (new_hard_iface && !kref_get_unless_zero(&new_hard_iface->refcount))
240                 new_hard_iface = NULL;
241 
242         curr_hard_iface = rcu_dereference_protected(bat_priv->primary_if, 1);
243         rcu_assign_pointer(bat_priv->primary_if, new_hard_iface);
244 
245         if (!new_hard_iface)
246                 goto out;
247 
248         bat_priv->bat_algo_ops->bat_primary_iface_set(new_hard_iface);
249         batadv_primary_if_update_addr(bat_priv, curr_hard_iface);
250 
251 out:
252         if (curr_hard_iface)
253                 batadv_hardif_put(curr_hard_iface);
254 }
255 
256 static bool
257 batadv_hardif_is_iface_up(const struct batadv_hard_iface *hard_iface)
258 {
259         if (hard_iface->net_dev->flags & IFF_UP)
260                 return true;
261 
262         return false;
263 }
264 
265 static void batadv_check_known_mac_addr(const struct net_device *net_dev)
266 {
267         const struct batadv_hard_iface *hard_iface;
268 
269         rcu_read_lock();
270         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
271                 if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
272                     (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
273                         continue;
274 
275                 if (hard_iface->net_dev == net_dev)
276                         continue;
277 
278                 if (!batadv_compare_eth(hard_iface->net_dev->dev_addr,
279                                         net_dev->dev_addr))
280                         continue;
281 
282                 pr_warn("The newly added mac address (%pM) already exists on: %s\n",
283                         net_dev->dev_addr, hard_iface->net_dev->name);
284                 pr_warn("It is strongly recommended to keep mac addresses unique to avoid problems!\n");
285         }
286         rcu_read_unlock();
287 }
288 
289 /**
290  * batadv_hardif_recalc_extra_skbroom() - Recalculate skbuff extra head/tailroom
291  * @soft_iface: netdev struct of the mesh interface
292  */
293 static void batadv_hardif_recalc_extra_skbroom(struct net_device *soft_iface)
294 {
295         const struct batadv_hard_iface *hard_iface;
296         unsigned short lower_header_len = ETH_HLEN;
297         unsigned short lower_headroom = 0;
298         unsigned short lower_tailroom = 0;
299         unsigned short needed_headroom;
300 
301         rcu_read_lock();
302         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
303                 if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
304                         continue;
305 
306                 if (hard_iface->soft_iface != soft_iface)
307                         continue;
308 
309                 lower_header_len = max_t(unsigned short, lower_header_len,
310                                          hard_iface->net_dev->hard_header_len);
311 
312                 lower_headroom = max_t(unsigned short, lower_headroom,
313                                        hard_iface->net_dev->needed_headroom);
314 
315                 lower_tailroom = max_t(unsigned short, lower_tailroom,
316                                        hard_iface->net_dev->needed_tailroom);
317         }
318         rcu_read_unlock();
319 
320         needed_headroom = lower_headroom + (lower_header_len - ETH_HLEN);
321         needed_headroom += batadv_max_header_len();
322 
323         soft_iface->needed_headroom = needed_headroom;
324         soft_iface->needed_tailroom = lower_tailroom;
325 }
326 
327 int batadv_hardif_min_mtu(struct net_device *soft_iface)
328 {
329         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
330         const struct batadv_hard_iface *hard_iface;
331         int min_mtu = INT_MAX;
332 
333         rcu_read_lock();
334         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
335                 if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
336                     (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
337                         continue;
338 
339                 if (hard_iface->soft_iface != soft_iface)
340                         continue;
341 
342                 min_mtu = min_t(int, hard_iface->net_dev->mtu, min_mtu);
343         }
344         rcu_read_unlock();
345 
346         if (atomic_read(&bat_priv->fragmentation) == 0)
347                 goto out;
348 
349         /* with fragmentation enabled the maximum size of internally generated
350          * packets such as translation table exchanges or tvlv containers, etc
351          * has to be calculated
352          */
353         min_mtu = min_t(int, min_mtu, BATADV_FRAG_MAX_FRAG_SIZE);
354         min_mtu -= sizeof(struct batadv_frag_packet);
355         min_mtu *= BATADV_FRAG_MAX_FRAGMENTS;
356 
357 out:
358         /* report to the other components the maximum amount of bytes that
359          * batman-adv can send over the wire (without considering the payload
360          * overhead). For example, this value is used by TT to compute the
361          * maximum local table table size
362          */
363         atomic_set(&bat_priv->packet_size_max, min_mtu);
364 
365         /* the real soft-interface MTU is computed by removing the payload
366          * overhead from the maximum amount of bytes that was just computed.
367          *
368          * However batman-adv does not support MTUs bigger than ETH_DATA_LEN
369          */
370         return min_t(int, min_mtu - batadv_max_header_len(), ETH_DATA_LEN);
371 }
372 
373 /* adjusts the MTU if a new interface with a smaller MTU appeared. */
374 void batadv_update_min_mtu(struct net_device *soft_iface)
375 {
376         soft_iface->mtu = batadv_hardif_min_mtu(soft_iface);
377 
378         /* Check if the local translate table should be cleaned up to match a
379          * new (and smaller) MTU.
380          */
381         batadv_tt_local_resize_to_mtu(soft_iface);
382 }
383 
384 static void
385 batadv_hardif_activate_interface(struct batadv_hard_iface *hard_iface)
386 {
387         struct batadv_priv *bat_priv;
388         struct batadv_hard_iface *primary_if = NULL;
389 
390         if (hard_iface->if_status != BATADV_IF_INACTIVE)
391                 goto out;
392 
393         bat_priv = netdev_priv(hard_iface->soft_iface);
394 
395         bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface);
396         hard_iface->if_status = BATADV_IF_TO_BE_ACTIVATED;
397 
398         /* the first active interface becomes our primary interface or
399          * the next active interface after the old primary interface was removed
400          */
401         primary_if = batadv_primary_if_get_selected(bat_priv);
402         if (!primary_if)
403                 batadv_primary_if_select(bat_priv, hard_iface);
404 
405         batadv_info(hard_iface->soft_iface, "Interface activated: %s\n",
406                     hard_iface->net_dev->name);
407 
408         batadv_update_min_mtu(hard_iface->soft_iface);
409 
410         if (bat_priv->bat_algo_ops->bat_iface_activate)
411                 bat_priv->bat_algo_ops->bat_iface_activate(hard_iface);
412 
413 out:
414         if (primary_if)
415                 batadv_hardif_put(primary_if);
416 }
417 
418 static void
419 batadv_hardif_deactivate_interface(struct batadv_hard_iface *hard_iface)
420 {
421         if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
422             (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
423                 return;
424 
425         hard_iface->if_status = BATADV_IF_INACTIVE;
426 
427         batadv_info(hard_iface->soft_iface, "Interface deactivated: %s\n",
428                     hard_iface->net_dev->name);
429 
430         batadv_update_min_mtu(hard_iface->soft_iface);
431 }
432 
433 /**
434  * batadv_master_del_slave - remove hard_iface from the current master interface
435  * @slave: the interface enslaved in another master
436  * @master: the master from which slave has to be removed
437  *
438  * Invoke ndo_del_slave on master passing slave as argument. In this way slave
439  * is free'd and master can correctly change its internal state.
440  *
441  * Return: 0 on success, a negative value representing the error otherwise
442  */
443 static int batadv_master_del_slave(struct batadv_hard_iface *slave,
444                                    struct net_device *master)
445 {
446         int ret;
447 
448         if (!master)
449                 return 0;
450 
451         ret = -EBUSY;
452         if (master->netdev_ops->ndo_del_slave)
453                 ret = master->netdev_ops->ndo_del_slave(master, slave->net_dev);
454 
455         return ret;
456 }
457 
458 int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
459                                    const char *iface_name)
460 {
461         struct batadv_priv *bat_priv;
462         struct net_device *soft_iface, *master;
463         __be16 ethertype = htons(ETH_P_BATMAN);
464         int max_header_len = batadv_max_header_len();
465         int ret;
466 
467         if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
468                 goto out;
469 
470         if (!kref_get_unless_zero(&hard_iface->refcount))
471                 goto out;
472 
473         soft_iface = dev_get_by_name(&init_net, iface_name);
474 
475         if (!soft_iface) {
476                 soft_iface = batadv_softif_create(iface_name);
477 
478                 if (!soft_iface) {
479                         ret = -ENOMEM;
480                         goto err;
481                 }
482 
483                 /* dev_get_by_name() increases the reference counter for us */
484                 dev_hold(soft_iface);
485         }
486 
487         if (!batadv_softif_is_valid(soft_iface)) {
488                 pr_err("Can't create batman mesh interface %s: already exists as regular interface\n",
489                        soft_iface->name);
490                 ret = -EINVAL;
491                 goto err_dev;
492         }
493 
494         /* check if the interface is enslaved in another virtual one and
495          * in that case unlink it first
496          */
497         master = netdev_master_upper_dev_get(hard_iface->net_dev);
498         ret = batadv_master_del_slave(hard_iface, master);
499         if (ret)
500                 goto err_dev;
501 
502         hard_iface->soft_iface = soft_iface;
503         bat_priv = netdev_priv(hard_iface->soft_iface);
504 
505         ret = netdev_master_upper_dev_link(hard_iface->net_dev,
506                                            soft_iface, NULL, NULL);
507         if (ret)
508                 goto err_dev;
509 
510         ret = bat_priv->bat_algo_ops->bat_iface_enable(hard_iface);
511         if (ret < 0)
512                 goto err_upper;
513 
514         hard_iface->if_num = bat_priv->num_ifaces;
515         bat_priv->num_ifaces++;
516         hard_iface->if_status = BATADV_IF_INACTIVE;
517         ret = batadv_orig_hash_add_if(hard_iface, bat_priv->num_ifaces);
518         if (ret < 0) {
519                 bat_priv->bat_algo_ops->bat_iface_disable(hard_iface);
520                 bat_priv->num_ifaces--;
521                 hard_iface->if_status = BATADV_IF_NOT_IN_USE;
522                 goto err_upper;
523         }
524 
525         hard_iface->batman_adv_ptype.type = ethertype;
526         hard_iface->batman_adv_ptype.func = batadv_batman_skb_recv;
527         hard_iface->batman_adv_ptype.dev = hard_iface->net_dev;
528         dev_add_pack(&hard_iface->batman_adv_ptype);
529 
530         batadv_info(hard_iface->soft_iface, "Adding interface: %s\n",
531                     hard_iface->net_dev->name);
532 
533         if (atomic_read(&bat_priv->fragmentation) &&
534             hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
535                 batadv_info(hard_iface->soft_iface,
536                             "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",
537                             hard_iface->net_dev->name, hard_iface->net_dev->mtu,
538                             ETH_DATA_LEN + max_header_len);
539 
540         if (!atomic_read(&bat_priv->fragmentation) &&
541             hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
542                 batadv_info(hard_iface->soft_iface,
543                             "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",
544                             hard_iface->net_dev->name, hard_iface->net_dev->mtu,
545                             ETH_DATA_LEN + max_header_len);
546 
547         if (batadv_hardif_is_iface_up(hard_iface))
548                 batadv_hardif_activate_interface(hard_iface);
549         else
550                 batadv_err(hard_iface->soft_iface,
551                            "Not using interface %s (retrying later): interface not active\n",
552                            hard_iface->net_dev->name);
553 
554         batadv_hardif_recalc_extra_skbroom(soft_iface);
555 
556         /* begin scheduling originator messages on that interface */
557         batadv_schedule_bat_ogm(hard_iface);
558 
559 out:
560         return 0;
561 
562 err_upper:
563         netdev_upper_dev_unlink(hard_iface->net_dev, soft_iface);
564 err_dev:
565         hard_iface->soft_iface = NULL;
566         dev_put(soft_iface);
567 err:
568         batadv_hardif_put(hard_iface);
569         return ret;
570 }
571 
572 void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface,
573                                      enum batadv_hard_if_cleanup autodel)
574 {
575         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
576         struct batadv_hard_iface *primary_if = NULL;
577 
578         batadv_hardif_deactivate_interface(hard_iface);
579 
580         if (hard_iface->if_status != BATADV_IF_INACTIVE)
581                 goto out;
582 
583         batadv_info(hard_iface->soft_iface, "Removing interface: %s\n",
584                     hard_iface->net_dev->name);
585         dev_remove_pack(&hard_iface->batman_adv_ptype);
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->bat_algo_ops->bat_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         ret = batadv_is_valid_iface(net_dev);
656         if (ret != 1)
657                 goto out;
658 
659         dev_hold(net_dev);
660 
661         hard_iface = kzalloc(sizeof(*hard_iface), GFP_ATOMIC);
662         if (!hard_iface)
663                 goto release_dev;
664 
665         ret = batadv_sysfs_add_hardif(&hard_iface->hardif_obj, net_dev);
666         if (ret)
667                 goto free_if;
668 
669         hard_iface->if_num = -1;
670         hard_iface->net_dev = net_dev;
671         hard_iface->soft_iface = NULL;
672         hard_iface->if_status = BATADV_IF_NOT_IN_USE;
673 
674         ret = batadv_debugfs_add_hardif(hard_iface);
675         if (ret)
676                 goto free_sysfs;
677 
678         INIT_LIST_HEAD(&hard_iface->list);
679         INIT_HLIST_HEAD(&hard_iface->neigh_list);
680         INIT_WORK(&hard_iface->cleanup_work,
681                   batadv_hardif_remove_interface_finish);
682 
683         spin_lock_init(&hard_iface->neigh_list_lock);
684 
685         hard_iface->num_bcasts = BATADV_NUM_BCASTS_DEFAULT;
686         if (batadv_is_wifi_netdev(net_dev))
687                 hard_iface->num_bcasts = BATADV_NUM_BCASTS_WIRELESS;
688 
689         /* extra reference for return */
690         kref_init(&hard_iface->refcount);
691         kref_get(&hard_iface->refcount);
692 
693         batadv_check_known_mac_addr(hard_iface->net_dev);
694         list_add_tail_rcu(&hard_iface->list, &batadv_hardif_list);
695 
696         return hard_iface;
697 
698 free_sysfs:
699         batadv_sysfs_del_hardif(&hard_iface->hardif_obj);
700 free_if:
701         kfree(hard_iface);
702 release_dev:
703         dev_put(net_dev);
704 out:
705         return NULL;
706 }
707 
708 static void batadv_hardif_remove_interface(struct batadv_hard_iface *hard_iface)
709 {
710         ASSERT_RTNL();
711 
712         /* first deactivate interface */
713         if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
714                 batadv_hardif_disable_interface(hard_iface,
715                                                 BATADV_IF_CLEANUP_AUTO);
716 
717         if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
718                 return;
719 
720         hard_iface->if_status = BATADV_IF_TO_BE_REMOVED;
721         queue_work(batadv_event_workqueue, &hard_iface->cleanup_work);
722 }
723 
724 void batadv_hardif_remove_interfaces(void)
725 {
726         struct batadv_hard_iface *hard_iface, *hard_iface_tmp;
727 
728         rtnl_lock();
729         list_for_each_entry_safe(hard_iface, hard_iface_tmp,
730                                  &batadv_hardif_list, list) {
731                 list_del_rcu(&hard_iface->list);
732                 batadv_hardif_remove_interface(hard_iface);
733         }
734         rtnl_unlock();
735 }
736 
737 static int batadv_hard_if_event(struct notifier_block *this,
738                                 unsigned long event, void *ptr)
739 {
740         struct net_device *net_dev = netdev_notifier_info_to_dev(ptr);
741         struct batadv_hard_iface *hard_iface;
742         struct batadv_hard_iface *primary_if = NULL;
743         struct batadv_priv *bat_priv;
744 
745         if (batadv_softif_is_valid(net_dev) && event == NETDEV_REGISTER) {
746                 batadv_sysfs_add_meshif(net_dev);
747                 bat_priv = netdev_priv(net_dev);
748                 batadv_softif_create_vlan(bat_priv, BATADV_NO_FLAGS);
749                 return NOTIFY_DONE;
750         }
751 
752         hard_iface = batadv_hardif_get_by_netdev(net_dev);
753         if (!hard_iface && (event == NETDEV_REGISTER ||
754                             event == NETDEV_POST_TYPE_CHANGE))
755                 hard_iface = batadv_hardif_add_interface(net_dev);
756 
757         if (!hard_iface)
758                 goto out;
759 
760         switch (event) {
761         case NETDEV_UP:
762                 batadv_hardif_activate_interface(hard_iface);
763                 break;
764         case NETDEV_GOING_DOWN:
765         case NETDEV_DOWN:
766                 batadv_hardif_deactivate_interface(hard_iface);
767                 break;
768         case NETDEV_UNREGISTER:
769         case NETDEV_PRE_TYPE_CHANGE:
770                 list_del_rcu(&hard_iface->list);
771 
772                 batadv_hardif_remove_interface(hard_iface);
773                 break;
774         case NETDEV_CHANGEMTU:
775                 if (hard_iface->soft_iface)
776                         batadv_update_min_mtu(hard_iface->soft_iface);
777                 break;
778         case NETDEV_CHANGEADDR:
779                 if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
780                         goto hardif_put;
781 
782                 batadv_check_known_mac_addr(hard_iface->net_dev);
783 
784                 bat_priv = netdev_priv(hard_iface->soft_iface);
785                 bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface);
786 
787                 primary_if = batadv_primary_if_get_selected(bat_priv);
788                 if (!primary_if)
789                         goto hardif_put;
790 
791                 if (hard_iface == primary_if)
792                         batadv_primary_if_update_addr(bat_priv, NULL);
793                 break;
794         default:
795                 break;
796         }
797 
798 hardif_put:
799         batadv_hardif_put(hard_iface);
800 out:
801         if (primary_if)
802                 batadv_hardif_put(primary_if);
803         return NOTIFY_DONE;
804 }
805 
806 struct notifier_block batadv_hard_if_notifier = {
807         .notifier_call = batadv_hard_if_event,
808 };
809 

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