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

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  1 /* Copyright (C) 2007-2017  B.A.T.M.A.N. contributors:
  2  *
  3  * Marek Lindner, Simon Wunderlich
  4  *
  5  * This program is free software; you can redistribute it and/or
  6  * modify it under the terms of version 2 of the GNU General Public
  7  * License as published by the Free Software Foundation.
  8  *
  9  * This program is distributed in the hope that it will be useful, but
 10  * WITHOUT ANY WARRANTY; without even the implied warranty of
 11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 12  * General Public License for more details.
 13  *
 14  * You should have received a copy of the GNU General Public License
 15  * along with this program; if not, see <http://www.gnu.org/licenses/>.
 16  */
 17 
 18 #include "hard-interface.h"
 19 #include "main.h"
 20 
 21 #include <linux/atomic.h>
 22 #include <linux/bug.h>
 23 #include <linux/byteorder/generic.h>
 24 #include <linux/errno.h>
 25 #include <linux/fs.h>
 26 #include <linux/if.h>
 27 #include <linux/if_arp.h>
 28 #include <linux/if_ether.h>
 29 #include <linux/kernel.h>
 30 #include <linux/kref.h>
 31 #include <linux/list.h>
 32 #include <linux/netdevice.h>
 33 #include <linux/printk.h>
 34 #include <linux/rculist.h>
 35 #include <linux/rtnetlink.h>
 36 #include <linux/slab.h>
 37 #include <linux/spinlock.h>
 38 #include <net/net_namespace.h>
 39 #include <net/rtnetlink.h>
 40 
 41 #include "bat_v.h"
 42 #include "bridge_loop_avoidance.h"
 43 #include "debugfs.h"
 44 #include "distributed-arp-table.h"
 45 #include "gateway_client.h"
 46 #include "log.h"
 47 #include "originator.h"
 48 #include "packet.h"
 49 #include "send.h"
 50 #include "soft-interface.h"
 51 #include "sysfs.h"
 52 #include "translation-table.h"
 53 
 54 /**
 55  * batadv_hardif_release - release hard interface from lists and queue for
 56  *  free after rcu grace period
 57  * @ref: kref pointer of the hard interface
 58  */
 59 void batadv_hardif_release(struct kref *ref)
 60 {
 61         struct batadv_hard_iface *hard_iface;
 62 
 63         hard_iface = container_of(ref, struct batadv_hard_iface, refcount);
 64         dev_put(hard_iface->net_dev);
 65 
 66         kfree_rcu(hard_iface, rcu);
 67 }
 68 
 69 struct batadv_hard_iface *
 70 batadv_hardif_get_by_netdev(const struct net_device *net_dev)
 71 {
 72         struct batadv_hard_iface *hard_iface;
 73 
 74         rcu_read_lock();
 75         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
 76                 if (hard_iface->net_dev == net_dev &&
 77                     kref_get_unless_zero(&hard_iface->refcount))
 78                         goto out;
 79         }
 80 
 81         hard_iface = NULL;
 82 
 83 out:
 84         rcu_read_unlock();
 85         return hard_iface;
 86 }
 87 
 88 /**
 89  * batadv_getlink_net - return link net namespace (of use fallback)
 90  * @netdev: net_device to check
 91  * @fallback_net: return in case get_link_net is not available for @netdev
 92  *
 93  * Return: result of rtnl_link_ops->get_link_net or @fallback_net
 94  */
 95 static struct net *batadv_getlink_net(const struct net_device *netdev,
 96                                       struct net *fallback_net)
 97 {
 98         if (!netdev->rtnl_link_ops)
 99                 return fallback_net;
100 
101         if (!netdev->rtnl_link_ops->get_link_net)
102                 return fallback_net;
103 
104         return netdev->rtnl_link_ops->get_link_net(netdev);
105 }
106 
107 /**
108  * batadv_mutual_parents - check if two devices are each others parent
109  * @dev1: 1st net dev
110  * @net1: 1st devices netns
111  * @dev2: 2nd net dev
112  * @net2: 2nd devices netns
113  *
114  * veth devices come in pairs and each is the parent of the other!
115  *
116  * Return: true if the devices are each others parent, otherwise false
117  */
118 static bool batadv_mutual_parents(const struct net_device *dev1,
119                                   struct net *net1,
120                                   const struct net_device *dev2,
121                                   struct net *net2)
122 {
123         int dev1_parent_iflink = dev_get_iflink(dev1);
124         int dev2_parent_iflink = dev_get_iflink(dev2);
125         const struct net *dev1_parent_net;
126         const struct net *dev2_parent_net;
127 
128         dev1_parent_net = batadv_getlink_net(dev1, net1);
129         dev2_parent_net = batadv_getlink_net(dev2, net2);
130 
131         if (!dev1_parent_iflink || !dev2_parent_iflink)
132                 return false;
133 
134         return (dev1_parent_iflink == dev2->ifindex) &&
135                (dev2_parent_iflink == dev1->ifindex) &&
136                net_eq(dev1_parent_net, net2) &&
137                net_eq(dev2_parent_net, net1);
138 }
139 
140 /**
141  * batadv_is_on_batman_iface - check if a device is a batman iface descendant
142  * @net_dev: the device to check
143  *
144  * If the user creates any virtual device on top of a batman-adv interface, it
145  * is important to prevent this new interface to be used to create a new mesh
146  * network (this behaviour would lead to a batman-over-batman configuration).
147  * This function recursively checks all the fathers of the device passed as
148  * argument looking for a batman-adv soft interface.
149  *
150  * Return: true if the device is descendant of a batman-adv mesh interface (or
151  * if it is a batman-adv interface itself), false otherwise
152  */
153 static bool batadv_is_on_batman_iface(const struct net_device *net_dev)
154 {
155         struct net *net = dev_net(net_dev);
156         struct net_device *parent_dev;
157         struct net *parent_net;
158         bool ret;
159 
160         /* check if this is a batman-adv mesh interface */
161         if (batadv_softif_is_valid(net_dev))
162                 return true;
163 
164         /* no more parents..stop recursion */
165         if (dev_get_iflink(net_dev) == 0 ||
166             dev_get_iflink(net_dev) == net_dev->ifindex)
167                 return false;
168 
169         parent_net = batadv_getlink_net(net_dev, net);
170 
171         /* recurse over the parent device */
172         parent_dev = __dev_get_by_index((struct net *)parent_net,
173                                         dev_get_iflink(net_dev));
174         /* if we got a NULL parent_dev there is something broken.. */
175         if (WARN(!parent_dev, "Cannot find parent device"))
176                 return false;
177 
178         if (batadv_mutual_parents(net_dev, net, parent_dev, parent_net))
179                 return false;
180 
181         ret = batadv_is_on_batman_iface(parent_dev);
182 
183         return ret;
184 }
185 
186 static bool batadv_is_valid_iface(const struct net_device *net_dev)
187 {
188         if (net_dev->flags & IFF_LOOPBACK)
189                 return false;
190 
191         if (net_dev->type != ARPHRD_ETHER)
192                 return false;
193 
194         if (net_dev->addr_len != ETH_ALEN)
195                 return false;
196 
197         /* no batman over batman */
198         if (batadv_is_on_batman_iface(net_dev))
199                 return false;
200 
201         return true;
202 }
203 
204 /**
205  * batadv_get_real_netdevice - check if the given netdev struct is a virtual
206  *  interface on top of another 'real' interface
207  * @netdev: the device to check
208  *
209  * Callers must hold the rtnl semaphore. You may want batadv_get_real_netdev()
210  * instead of this.
211  *
212  * Return: the 'real' net device or the original net device and NULL in case
213  *  of an error.
214  */
215 static struct net_device *batadv_get_real_netdevice(struct net_device *netdev)
216 {
217         struct batadv_hard_iface *hard_iface = NULL;
218         struct net_device *real_netdev = NULL;
219         struct net *real_net;
220         struct net *net;
221         int ifindex;
222 
223         ASSERT_RTNL();
224 
225         if (!netdev)
226                 return NULL;
227 
228         if (netdev->ifindex == dev_get_iflink(netdev)) {
229                 dev_hold(netdev);
230                 return netdev;
231         }
232 
233         hard_iface = batadv_hardif_get_by_netdev(netdev);
234         if (!hard_iface || !hard_iface->soft_iface)
235                 goto out;
236 
237         net = dev_net(hard_iface->soft_iface);
238         ifindex = dev_get_iflink(netdev);
239         real_net = batadv_getlink_net(netdev, net);
240         real_netdev = dev_get_by_index(real_net, ifindex);
241 
242 out:
243         if (hard_iface)
244                 batadv_hardif_put(hard_iface);
245         return real_netdev;
246 }
247 
248 /**
249  * batadv_get_real_netdev - check if the given net_device struct is a virtual
250  *  interface on top of another 'real' interface
251  * @net_device: the device to check
252  *
253  * Return: the 'real' net device or the original net device and NULL in case
254  *  of an error.
255  */
256 struct net_device *batadv_get_real_netdev(struct net_device *net_device)
257 {
258         struct net_device *real_netdev;
259 
260         rtnl_lock();
261         real_netdev = batadv_get_real_netdevice(net_device);
262         rtnl_unlock();
263 
264         return real_netdev;
265 }
266 
267 /**
268  * batadv_is_wext_netdev - check if the given net_device struct is a
269  *  wext wifi interface
270  * @net_device: the device to check
271  *
272  * Return: true if the net device is a wext wireless device, false
273  *  otherwise.
274  */
275 static bool batadv_is_wext_netdev(struct net_device *net_device)
276 {
277         if (!net_device)
278                 return false;
279 
280 #ifdef CONFIG_WIRELESS_EXT
281         /* pre-cfg80211 drivers have to implement WEXT, so it is possible to
282          * check for wireless_handlers != NULL
283          */
284         if (net_device->wireless_handlers)
285                 return true;
286 #endif
287 
288         return false;
289 }
290 
291 /**
292  * batadv_is_cfg80211_netdev - check if the given net_device struct is a
293  *  cfg80211 wifi interface
294  * @net_device: the device to check
295  *
296  * Return: true if the net device is a cfg80211 wireless device, false
297  *  otherwise.
298  */
299 static bool batadv_is_cfg80211_netdev(struct net_device *net_device)
300 {
301         if (!net_device)
302                 return false;
303 
304         /* cfg80211 drivers have to set ieee80211_ptr */
305         if (net_device->ieee80211_ptr)
306                 return true;
307 
308         return false;
309 }
310 
311 /**
312  * batadv_wifi_flags_evaluate - calculate wifi flags for net_device
313  * @net_device: the device to check
314  *
315  * Return: batadv_hard_iface_wifi_flags flags of the device
316  */
317 static u32 batadv_wifi_flags_evaluate(struct net_device *net_device)
318 {
319         u32 wifi_flags = 0;
320         struct net_device *real_netdev;
321 
322         if (batadv_is_wext_netdev(net_device))
323                 wifi_flags |= BATADV_HARDIF_WIFI_WEXT_DIRECT;
324 
325         if (batadv_is_cfg80211_netdev(net_device))
326                 wifi_flags |= BATADV_HARDIF_WIFI_CFG80211_DIRECT;
327 
328         real_netdev = batadv_get_real_netdevice(net_device);
329         if (!real_netdev)
330                 return wifi_flags;
331 
332         if (real_netdev == net_device)
333                 goto out;
334 
335         if (batadv_is_wext_netdev(real_netdev))
336                 wifi_flags |= BATADV_HARDIF_WIFI_WEXT_INDIRECT;
337 
338         if (batadv_is_cfg80211_netdev(real_netdev))
339                 wifi_flags |= BATADV_HARDIF_WIFI_CFG80211_INDIRECT;
340 
341 out:
342         dev_put(real_netdev);
343         return wifi_flags;
344 }
345 
346 /**
347  * batadv_is_cfg80211_hardif - check if the given hardif is a cfg80211 wifi
348  *  interface
349  * @hard_iface: the device to check
350  *
351  * Return: true if the net device is a cfg80211 wireless device, false
352  *  otherwise.
353  */
354 bool batadv_is_cfg80211_hardif(struct batadv_hard_iface *hard_iface)
355 {
356         u32 allowed_flags = 0;
357 
358         allowed_flags |= BATADV_HARDIF_WIFI_CFG80211_DIRECT;
359         allowed_flags |= BATADV_HARDIF_WIFI_CFG80211_INDIRECT;
360 
361         return !!(hard_iface->wifi_flags & allowed_flags);
362 }
363 
364 /**
365  * batadv_is_wifi_hardif - check if the given hardif is a wifi interface
366  * @hard_iface: the device to check
367  *
368  * Return: true if the net device is a 802.11 wireless device, false otherwise.
369  */
370 bool batadv_is_wifi_hardif(struct batadv_hard_iface *hard_iface)
371 {
372         if (!hard_iface)
373                 return false;
374 
375         return hard_iface->wifi_flags != 0;
376 }
377 
378 /**
379  * batadv_hardif_no_broadcast - check whether (re)broadcast is necessary
380  * @if_outgoing: the outgoing interface checked and considered for (re)broadcast
381  * @orig_addr: the originator of this packet
382  * @orig_neigh: originator address of the forwarder we just got the packet from
383  *  (NULL if we originated)
384  *
385  * Checks whether a packet needs to be (re)broadcasted on the given interface.
386  *
387  * Return:
388  *      BATADV_HARDIF_BCAST_NORECIPIENT: No neighbor on interface
389  *      BATADV_HARDIF_BCAST_DUPFWD: Just one neighbor, but it is the forwarder
390  *      BATADV_HARDIF_BCAST_DUPORIG: Just one neighbor, but it is the originator
391  *      BATADV_HARDIF_BCAST_OK: Several neighbors, must broadcast
392  */
393 int batadv_hardif_no_broadcast(struct batadv_hard_iface *if_outgoing,
394                                u8 *orig_addr, u8 *orig_neigh)
395 {
396         struct batadv_hardif_neigh_node *hardif_neigh;
397         struct hlist_node *first;
398         int ret = BATADV_HARDIF_BCAST_OK;
399 
400         rcu_read_lock();
401 
402         /* 0 neighbors -> no (re)broadcast */
403         first = rcu_dereference(hlist_first_rcu(&if_outgoing->neigh_list));
404         if (!first) {
405                 ret = BATADV_HARDIF_BCAST_NORECIPIENT;
406                 goto out;
407         }
408 
409         /* >1 neighbors -> (re)brodcast */
410         if (rcu_dereference(hlist_next_rcu(first)))
411                 goto out;
412 
413         hardif_neigh = hlist_entry(first, struct batadv_hardif_neigh_node,
414                                    list);
415 
416         /* 1 neighbor, is the originator -> no rebroadcast */
417         if (orig_addr && batadv_compare_eth(hardif_neigh->orig, orig_addr)) {
418                 ret = BATADV_HARDIF_BCAST_DUPORIG;
419         /* 1 neighbor, is the one we received from -> no rebroadcast */
420         } else if (orig_neigh &&
421                    batadv_compare_eth(hardif_neigh->orig, orig_neigh)) {
422                 ret = BATADV_HARDIF_BCAST_DUPFWD;
423         }
424 
425 out:
426         rcu_read_unlock();
427         return ret;
428 }
429 
430 static struct batadv_hard_iface *
431 batadv_hardif_get_active(const struct net_device *soft_iface)
432 {
433         struct batadv_hard_iface *hard_iface;
434 
435         rcu_read_lock();
436         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
437                 if (hard_iface->soft_iface != soft_iface)
438                         continue;
439 
440                 if (hard_iface->if_status == BATADV_IF_ACTIVE &&
441                     kref_get_unless_zero(&hard_iface->refcount))
442                         goto out;
443         }
444 
445         hard_iface = NULL;
446 
447 out:
448         rcu_read_unlock();
449         return hard_iface;
450 }
451 
452 static void batadv_primary_if_update_addr(struct batadv_priv *bat_priv,
453                                           struct batadv_hard_iface *oldif)
454 {
455         struct batadv_hard_iface *primary_if;
456 
457         primary_if = batadv_primary_if_get_selected(bat_priv);
458         if (!primary_if)
459                 goto out;
460 
461         batadv_dat_init_own_addr(bat_priv, primary_if);
462         batadv_bla_update_orig_address(bat_priv, primary_if, oldif);
463 out:
464         if (primary_if)
465                 batadv_hardif_put(primary_if);
466 }
467 
468 static void batadv_primary_if_select(struct batadv_priv *bat_priv,
469                                      struct batadv_hard_iface *new_hard_iface)
470 {
471         struct batadv_hard_iface *curr_hard_iface;
472 
473         ASSERT_RTNL();
474 
475         if (new_hard_iface)
476                 kref_get(&new_hard_iface->refcount);
477 
478         curr_hard_iface = rcu_dereference_protected(bat_priv->primary_if, 1);
479         rcu_assign_pointer(bat_priv->primary_if, new_hard_iface);
480 
481         if (!new_hard_iface)
482                 goto out;
483 
484         bat_priv->algo_ops->iface.primary_set(new_hard_iface);
485         batadv_primary_if_update_addr(bat_priv, curr_hard_iface);
486 
487 out:
488         if (curr_hard_iface)
489                 batadv_hardif_put(curr_hard_iface);
490 }
491 
492 static bool
493 batadv_hardif_is_iface_up(const struct batadv_hard_iface *hard_iface)
494 {
495         if (hard_iface->net_dev->flags & IFF_UP)
496                 return true;
497 
498         return false;
499 }
500 
501 static void batadv_check_known_mac_addr(const struct net_device *net_dev)
502 {
503         const struct batadv_hard_iface *hard_iface;
504 
505         rcu_read_lock();
506         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
507                 if (hard_iface->if_status != BATADV_IF_ACTIVE &&
508                     hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)
509                         continue;
510 
511                 if (hard_iface->net_dev == net_dev)
512                         continue;
513 
514                 if (!batadv_compare_eth(hard_iface->net_dev->dev_addr,
515                                         net_dev->dev_addr))
516                         continue;
517 
518                 pr_warn("The newly added mac address (%pM) already exists on: %s\n",
519                         net_dev->dev_addr, hard_iface->net_dev->name);
520                 pr_warn("It is strongly recommended to keep mac addresses unique to avoid problems!\n");
521         }
522         rcu_read_unlock();
523 }
524 
525 /**
526  * batadv_hardif_recalc_extra_skbroom() - Recalculate skbuff extra head/tailroom
527  * @soft_iface: netdev struct of the mesh interface
528  */
529 static void batadv_hardif_recalc_extra_skbroom(struct net_device *soft_iface)
530 {
531         const struct batadv_hard_iface *hard_iface;
532         unsigned short lower_header_len = ETH_HLEN;
533         unsigned short lower_headroom = 0;
534         unsigned short lower_tailroom = 0;
535         unsigned short needed_headroom;
536 
537         rcu_read_lock();
538         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
539                 if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
540                         continue;
541 
542                 if (hard_iface->soft_iface != soft_iface)
543                         continue;
544 
545                 lower_header_len = max_t(unsigned short, lower_header_len,
546                                          hard_iface->net_dev->hard_header_len);
547 
548                 lower_headroom = max_t(unsigned short, lower_headroom,
549                                        hard_iface->net_dev->needed_headroom);
550 
551                 lower_tailroom = max_t(unsigned short, lower_tailroom,
552                                        hard_iface->net_dev->needed_tailroom);
553         }
554         rcu_read_unlock();
555 
556         needed_headroom = lower_headroom + (lower_header_len - ETH_HLEN);
557         needed_headroom += batadv_max_header_len();
558 
559         soft_iface->needed_headroom = needed_headroom;
560         soft_iface->needed_tailroom = lower_tailroom;
561 }
562 
563 int batadv_hardif_min_mtu(struct net_device *soft_iface)
564 {
565         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
566         const struct batadv_hard_iface *hard_iface;
567         int min_mtu = INT_MAX;
568 
569         rcu_read_lock();
570         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
571                 if (hard_iface->if_status != BATADV_IF_ACTIVE &&
572                     hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)
573                         continue;
574 
575                 if (hard_iface->soft_iface != soft_iface)
576                         continue;
577 
578                 min_mtu = min_t(int, hard_iface->net_dev->mtu, min_mtu);
579         }
580         rcu_read_unlock();
581 
582         if (atomic_read(&bat_priv->fragmentation) == 0)
583                 goto out;
584 
585         /* with fragmentation enabled the maximum size of internally generated
586          * packets such as translation table exchanges or tvlv containers, etc
587          * has to be calculated
588          */
589         min_mtu = min_t(int, min_mtu, BATADV_FRAG_MAX_FRAG_SIZE);
590         min_mtu -= sizeof(struct batadv_frag_packet);
591         min_mtu *= BATADV_FRAG_MAX_FRAGMENTS;
592 
593 out:
594         /* report to the other components the maximum amount of bytes that
595          * batman-adv can send over the wire (without considering the payload
596          * overhead). For example, this value is used by TT to compute the
597          * maximum local table table size
598          */
599         atomic_set(&bat_priv->packet_size_max, min_mtu);
600 
601         /* the real soft-interface MTU is computed by removing the payload
602          * overhead from the maximum amount of bytes that was just computed.
603          *
604          * However batman-adv does not support MTUs bigger than ETH_DATA_LEN
605          */
606         return min_t(int, min_mtu - batadv_max_header_len(), ETH_DATA_LEN);
607 }
608 
609 /* adjusts the MTU if a new interface with a smaller MTU appeared. */
610 void batadv_update_min_mtu(struct net_device *soft_iface)
611 {
612         soft_iface->mtu = batadv_hardif_min_mtu(soft_iface);
613 
614         /* Check if the local translate table should be cleaned up to match a
615          * new (and smaller) MTU.
616          */
617         batadv_tt_local_resize_to_mtu(soft_iface);
618 }
619 
620 static void
621 batadv_hardif_activate_interface(struct batadv_hard_iface *hard_iface)
622 {
623         struct batadv_priv *bat_priv;
624         struct batadv_hard_iface *primary_if = NULL;
625 
626         if (hard_iface->if_status != BATADV_IF_INACTIVE)
627                 goto out;
628 
629         bat_priv = netdev_priv(hard_iface->soft_iface);
630 
631         bat_priv->algo_ops->iface.update_mac(hard_iface);
632         hard_iface->if_status = BATADV_IF_TO_BE_ACTIVATED;
633 
634         /* the first active interface becomes our primary interface or
635          * the next active interface after the old primary interface was removed
636          */
637         primary_if = batadv_primary_if_get_selected(bat_priv);
638         if (!primary_if)
639                 batadv_primary_if_select(bat_priv, hard_iface);
640 
641         batadv_info(hard_iface->soft_iface, "Interface activated: %s\n",
642                     hard_iface->net_dev->name);
643 
644         batadv_update_min_mtu(hard_iface->soft_iface);
645 
646         if (bat_priv->algo_ops->iface.activate)
647                 bat_priv->algo_ops->iface.activate(hard_iface);
648 
649 out:
650         if (primary_if)
651                 batadv_hardif_put(primary_if);
652 }
653 
654 static void
655 batadv_hardif_deactivate_interface(struct batadv_hard_iface *hard_iface)
656 {
657         if (hard_iface->if_status != BATADV_IF_ACTIVE &&
658             hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)
659                 return;
660 
661         hard_iface->if_status = BATADV_IF_INACTIVE;
662 
663         batadv_info(hard_iface->soft_iface, "Interface deactivated: %s\n",
664                     hard_iface->net_dev->name);
665 
666         batadv_update_min_mtu(hard_iface->soft_iface);
667 }
668 
669 /**
670  * batadv_master_del_slave - remove hard_iface from the current master interface
671  * @slave: the interface enslaved in another master
672  * @master: the master from which slave has to be removed
673  *
674  * Invoke ndo_del_slave on master passing slave as argument. In this way slave
675  * is free'd and master can correctly change its internal state.
676  *
677  * Return: 0 on success, a negative value representing the error otherwise
678  */
679 static int batadv_master_del_slave(struct batadv_hard_iface *slave,
680                                    struct net_device *master)
681 {
682         int ret;
683 
684         if (!master)
685                 return 0;
686 
687         ret = -EBUSY;
688         if (master->netdev_ops->ndo_del_slave)
689                 ret = master->netdev_ops->ndo_del_slave(master, slave->net_dev);
690 
691         return ret;
692 }
693 
694 int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
695                                    struct net *net, const char *iface_name)
696 {
697         struct batadv_priv *bat_priv;
698         struct net_device *soft_iface, *master;
699         __be16 ethertype = htons(ETH_P_BATMAN);
700         int max_header_len = batadv_max_header_len();
701         int ret;
702 
703         if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
704                 goto out;
705 
706         kref_get(&hard_iface->refcount);
707 
708         soft_iface = dev_get_by_name(net, iface_name);
709 
710         if (!soft_iface) {
711                 soft_iface = batadv_softif_create(net, iface_name);
712 
713                 if (!soft_iface) {
714                         ret = -ENOMEM;
715                         goto err;
716                 }
717 
718                 /* dev_get_by_name() increases the reference counter for us */
719                 dev_hold(soft_iface);
720         }
721 
722         if (!batadv_softif_is_valid(soft_iface)) {
723                 pr_err("Can't create batman mesh interface %s: already exists as regular interface\n",
724                        soft_iface->name);
725                 ret = -EINVAL;
726                 goto err_dev;
727         }
728 
729         /* check if the interface is enslaved in another virtual one and
730          * in that case unlink it first
731          */
732         master = netdev_master_upper_dev_get(hard_iface->net_dev);
733         ret = batadv_master_del_slave(hard_iface, master);
734         if (ret)
735                 goto err_dev;
736 
737         hard_iface->soft_iface = soft_iface;
738         bat_priv = netdev_priv(hard_iface->soft_iface);
739 
740         ret = netdev_master_upper_dev_link(hard_iface->net_dev,
741                                            soft_iface, NULL, NULL, NULL);
742         if (ret)
743                 goto err_dev;
744 
745         ret = bat_priv->algo_ops->iface.enable(hard_iface);
746         if (ret < 0)
747                 goto err_upper;
748 
749         hard_iface->if_num = bat_priv->num_ifaces;
750         bat_priv->num_ifaces++;
751         hard_iface->if_status = BATADV_IF_INACTIVE;
752         ret = batadv_orig_hash_add_if(hard_iface, bat_priv->num_ifaces);
753         if (ret < 0) {
754                 bat_priv->algo_ops->iface.disable(hard_iface);
755                 bat_priv->num_ifaces--;
756                 hard_iface->if_status = BATADV_IF_NOT_IN_USE;
757                 goto err_upper;
758         }
759 
760         kref_get(&hard_iface->refcount);
761         hard_iface->batman_adv_ptype.type = ethertype;
762         hard_iface->batman_adv_ptype.func = batadv_batman_skb_recv;
763         hard_iface->batman_adv_ptype.dev = hard_iface->net_dev;
764         dev_add_pack(&hard_iface->batman_adv_ptype);
765 
766         batadv_info(hard_iface->soft_iface, "Adding interface: %s\n",
767                     hard_iface->net_dev->name);
768 
769         if (atomic_read(&bat_priv->fragmentation) &&
770             hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
771                 batadv_info(hard_iface->soft_iface,
772                             "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",
773                             hard_iface->net_dev->name, hard_iface->net_dev->mtu,
774                             ETH_DATA_LEN + max_header_len);
775 
776         if (!atomic_read(&bat_priv->fragmentation) &&
777             hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
778                 batadv_info(hard_iface->soft_iface,
779                             "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",
780                             hard_iface->net_dev->name, hard_iface->net_dev->mtu,
781                             ETH_DATA_LEN + max_header_len);
782 
783         if (batadv_hardif_is_iface_up(hard_iface))
784                 batadv_hardif_activate_interface(hard_iface);
785         else
786                 batadv_err(hard_iface->soft_iface,
787                            "Not using interface %s (retrying later): interface not active\n",
788                            hard_iface->net_dev->name);
789 
790         batadv_hardif_recalc_extra_skbroom(soft_iface);
791 
792 out:
793         return 0;
794 
795 err_upper:
796         netdev_upper_dev_unlink(hard_iface->net_dev, soft_iface);
797 err_dev:
798         hard_iface->soft_iface = NULL;
799         dev_put(soft_iface);
800 err:
801         batadv_hardif_put(hard_iface);
802         return ret;
803 }
804 
805 void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface,
806                                      enum batadv_hard_if_cleanup autodel)
807 {
808         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
809         struct batadv_hard_iface *primary_if = NULL;
810 
811         batadv_hardif_deactivate_interface(hard_iface);
812 
813         if (hard_iface->if_status != BATADV_IF_INACTIVE)
814                 goto out;
815 
816         batadv_info(hard_iface->soft_iface, "Removing interface: %s\n",
817                     hard_iface->net_dev->name);
818         dev_remove_pack(&hard_iface->batman_adv_ptype);
819         batadv_hardif_put(hard_iface);
820 
821         bat_priv->num_ifaces--;
822         batadv_orig_hash_del_if(hard_iface, bat_priv->num_ifaces);
823 
824         primary_if = batadv_primary_if_get_selected(bat_priv);
825         if (hard_iface == primary_if) {
826                 struct batadv_hard_iface *new_if;
827 
828                 new_if = batadv_hardif_get_active(hard_iface->soft_iface);
829                 batadv_primary_if_select(bat_priv, new_if);
830 
831                 if (new_if)
832                         batadv_hardif_put(new_if);
833         }
834 
835         bat_priv->algo_ops->iface.disable(hard_iface);
836         hard_iface->if_status = BATADV_IF_NOT_IN_USE;
837 
838         /* delete all references to this hard_iface */
839         batadv_purge_orig_ref(bat_priv);
840         batadv_purge_outstanding_packets(bat_priv, hard_iface);
841         dev_put(hard_iface->soft_iface);
842 
843         netdev_upper_dev_unlink(hard_iface->net_dev, hard_iface->soft_iface);
844         batadv_hardif_recalc_extra_skbroom(hard_iface->soft_iface);
845 
846         /* nobody uses this interface anymore */
847         if (!bat_priv->num_ifaces) {
848                 batadv_gw_check_client_stop(bat_priv);
849 
850                 if (autodel == BATADV_IF_CLEANUP_AUTO)
851                         batadv_softif_destroy_sysfs(hard_iface->soft_iface);
852         }
853 
854         hard_iface->soft_iface = NULL;
855         batadv_hardif_put(hard_iface);
856 
857 out:
858         if (primary_if)
859                 batadv_hardif_put(primary_if);
860 }
861 
862 static struct batadv_hard_iface *
863 batadv_hardif_add_interface(struct net_device *net_dev)
864 {
865         struct batadv_hard_iface *hard_iface;
866         int ret;
867 
868         ASSERT_RTNL();
869 
870         if (!batadv_is_valid_iface(net_dev))
871                 goto out;
872 
873         dev_hold(net_dev);
874 
875         hard_iface = kzalloc(sizeof(*hard_iface), GFP_ATOMIC);
876         if (!hard_iface)
877                 goto release_dev;
878 
879         ret = batadv_sysfs_add_hardif(&hard_iface->hardif_obj, net_dev);
880         if (ret)
881                 goto free_if;
882 
883         hard_iface->if_num = -1;
884         hard_iface->net_dev = net_dev;
885         hard_iface->soft_iface = NULL;
886         hard_iface->if_status = BATADV_IF_NOT_IN_USE;
887 
888         ret = batadv_debugfs_add_hardif(hard_iface);
889         if (ret)
890                 goto free_sysfs;
891 
892         INIT_LIST_HEAD(&hard_iface->list);
893         INIT_HLIST_HEAD(&hard_iface->neigh_list);
894 
895         spin_lock_init(&hard_iface->neigh_list_lock);
896         kref_init(&hard_iface->refcount);
897 
898         hard_iface->num_bcasts = BATADV_NUM_BCASTS_DEFAULT;
899         hard_iface->wifi_flags = batadv_wifi_flags_evaluate(net_dev);
900         if (batadv_is_wifi_hardif(hard_iface))
901                 hard_iface->num_bcasts = BATADV_NUM_BCASTS_WIRELESS;
902 
903         batadv_v_hardif_init(hard_iface);
904 
905         batadv_check_known_mac_addr(hard_iface->net_dev);
906         kref_get(&hard_iface->refcount);
907         list_add_tail_rcu(&hard_iface->list, &batadv_hardif_list);
908 
909         return hard_iface;
910 
911 free_sysfs:
912         batadv_sysfs_del_hardif(&hard_iface->hardif_obj);
913 free_if:
914         kfree(hard_iface);
915 release_dev:
916         dev_put(net_dev);
917 out:
918         return NULL;
919 }
920 
921 static void batadv_hardif_remove_interface(struct batadv_hard_iface *hard_iface)
922 {
923         ASSERT_RTNL();
924 
925         /* first deactivate interface */
926         if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
927                 batadv_hardif_disable_interface(hard_iface,
928                                                 BATADV_IF_CLEANUP_KEEP);
929 
930         if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
931                 return;
932 
933         hard_iface->if_status = BATADV_IF_TO_BE_REMOVED;
934         batadv_debugfs_del_hardif(hard_iface);
935         batadv_sysfs_del_hardif(&hard_iface->hardif_obj);
936         batadv_hardif_put(hard_iface);
937 }
938 
939 void batadv_hardif_remove_interfaces(void)
940 {
941         struct batadv_hard_iface *hard_iface, *hard_iface_tmp;
942 
943         rtnl_lock();
944         list_for_each_entry_safe(hard_iface, hard_iface_tmp,
945                                  &batadv_hardif_list, list) {
946                 list_del_rcu(&hard_iface->list);
947                 batadv_hardif_remove_interface(hard_iface);
948         }
949         rtnl_unlock();
950 }
951 
952 static int batadv_hard_if_event(struct notifier_block *this,
953                                 unsigned long event, void *ptr)
954 {
955         struct net_device *net_dev = netdev_notifier_info_to_dev(ptr);
956         struct batadv_hard_iface *hard_iface;
957         struct batadv_hard_iface *primary_if = NULL;
958         struct batadv_priv *bat_priv;
959 
960         if (batadv_softif_is_valid(net_dev) && event == NETDEV_REGISTER) {
961                 batadv_sysfs_add_meshif(net_dev);
962                 bat_priv = netdev_priv(net_dev);
963                 batadv_softif_create_vlan(bat_priv, BATADV_NO_FLAGS);
964                 return NOTIFY_DONE;
965         }
966 
967         hard_iface = batadv_hardif_get_by_netdev(net_dev);
968         if (!hard_iface && (event == NETDEV_REGISTER ||
969                             event == NETDEV_POST_TYPE_CHANGE))
970                 hard_iface = batadv_hardif_add_interface(net_dev);
971 
972         if (!hard_iface)
973                 goto out;
974 
975         switch (event) {
976         case NETDEV_UP:
977                 batadv_hardif_activate_interface(hard_iface);
978                 break;
979         case NETDEV_GOING_DOWN:
980         case NETDEV_DOWN:
981                 batadv_hardif_deactivate_interface(hard_iface);
982                 break;
983         case NETDEV_UNREGISTER:
984         case NETDEV_PRE_TYPE_CHANGE:
985                 list_del_rcu(&hard_iface->list);
986 
987                 batadv_hardif_remove_interface(hard_iface);
988                 break;
989         case NETDEV_CHANGEMTU:
990                 if (hard_iface->soft_iface)
991                         batadv_update_min_mtu(hard_iface->soft_iface);
992                 break;
993         case NETDEV_CHANGEADDR:
994                 if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
995                         goto hardif_put;
996 
997                 batadv_check_known_mac_addr(hard_iface->net_dev);
998 
999                 bat_priv = netdev_priv(hard_iface->soft_iface);
1000                 bat_priv->algo_ops->iface.update_mac(hard_iface);
1001 
1002                 primary_if = batadv_primary_if_get_selected(bat_priv);
1003                 if (!primary_if)
1004                         goto hardif_put;
1005 
1006                 if (hard_iface == primary_if)
1007                         batadv_primary_if_update_addr(bat_priv, NULL);
1008                 break;
1009         case NETDEV_CHANGEUPPER:
1010                 hard_iface->wifi_flags = batadv_wifi_flags_evaluate(net_dev);
1011                 if (batadv_is_wifi_hardif(hard_iface))
1012                         hard_iface->num_bcasts = BATADV_NUM_BCASTS_WIRELESS;
1013                 break;
1014         default:
1015                 break;
1016         }
1017 
1018 hardif_put:
1019         batadv_hardif_put(hard_iface);
1020 out:
1021         if (primary_if)
1022                 batadv_hardif_put(primary_if);
1023         return NOTIFY_DONE;
1024 }
1025 
1026 struct notifier_block batadv_hard_if_notifier = {
1027         .notifier_call = batadv_hard_if_event,
1028 };
1029 

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