1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (C) B.A.T.M.A.N. contributors:
4 * Marek Lindner, Simon Wunderlich
7 #include "hard-interface.h"
10 #include <linux/atomic.h>
11 #include <linux/byteorder/generic.h>
12 #include <linux/container_of.h>
13 #include <linux/gfp.h>
15 #include <linux/if_arp.h>
16 #include <linux/if_ether.h>
17 #include <linux/kref.h>
18 #include <linux/limits.h>
19 #include <linux/list.h>
20 #include <linux/minmax.h>
21 #include <linux/mutex.h>
22 #include <linux/netdevice.h>
23 #include <linux/printk.h>
24 #include <linux/rculist.h>
25 #include <linux/rtnetlink.h>
26 #include <linux/slab.h>
27 #include <linux/spinlock.h>
28 #include <net/net_namespace.h>
29 #include <net/rtnetlink.h>
30 #include <uapi/linux/batadv_packet.h>
33 #include "bridge_loop_avoidance.h"
34 #include "distributed-arp-table.h"
35 #include "gateway_client.h"
37 #include "originator.h"
39 #include "soft-interface.h"
40 #include "translation-table.h"
43 * batadv_hardif_release() - release hard interface from lists and queue for
44 * free after rcu grace period
45 * @ref: kref pointer of the hard interface
47 void batadv_hardif_release(struct kref *ref)
49 struct batadv_hard_iface *hard_iface;
51 hard_iface = container_of(ref, struct batadv_hard_iface, refcount);
52 dev_put(hard_iface->net_dev);
54 kfree_rcu(hard_iface, rcu);
58 * batadv_hardif_get_by_netdev() - Get hard interface object of a net_device
59 * @net_dev: net_device to search for
61 * Return: batadv_hard_iface of net_dev (with increased refcnt), NULL on errors
63 struct batadv_hard_iface *
64 batadv_hardif_get_by_netdev(const struct net_device *net_dev)
66 struct batadv_hard_iface *hard_iface;
69 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
70 if (hard_iface->net_dev == net_dev &&
71 kref_get_unless_zero(&hard_iface->refcount))
83 * batadv_getlink_net() - return link net namespace (of use fallback)
84 * @netdev: net_device to check
85 * @fallback_net: return in case get_link_net is not available for @netdev
87 * Return: result of rtnl_link_ops->get_link_net or @fallback_net
89 static struct net *batadv_getlink_net(const struct net_device *netdev,
90 struct net *fallback_net)
92 if (!netdev->rtnl_link_ops)
95 if (!netdev->rtnl_link_ops->get_link_net)
98 return netdev->rtnl_link_ops->get_link_net(netdev);
102 * batadv_mutual_parents() - check if two devices are each others parent
104 * @net1: 1st devices netns
106 * @net2: 2nd devices netns
108 * veth devices come in pairs and each is the parent of the other!
110 * Return: true if the devices are each others parent, otherwise false
112 static bool batadv_mutual_parents(const struct net_device *dev1,
114 const struct net_device *dev2,
117 int dev1_parent_iflink = dev_get_iflink(dev1);
118 int dev2_parent_iflink = dev_get_iflink(dev2);
119 const struct net *dev1_parent_net;
120 const struct net *dev2_parent_net;
122 dev1_parent_net = batadv_getlink_net(dev1, net1);
123 dev2_parent_net = batadv_getlink_net(dev2, net2);
125 if (!dev1_parent_iflink || !dev2_parent_iflink)
128 return (dev1_parent_iflink == dev2->ifindex) &&
129 (dev2_parent_iflink == dev1->ifindex) &&
130 net_eq(dev1_parent_net, net2) &&
131 net_eq(dev2_parent_net, net1);
135 * batadv_is_on_batman_iface() - check if a device is a batman iface descendant
136 * @net_dev: the device to check
138 * If the user creates any virtual device on top of a batman-adv interface, it
139 * is important to prevent this new interface from being used to create a new
140 * mesh network (this behaviour would lead to a batman-over-batman
141 * configuration). This function recursively checks all the fathers of the
142 * device passed as argument looking for a batman-adv soft interface.
144 * Return: true if the device is descendant of a batman-adv mesh interface (or
145 * if it is a batman-adv interface itself), false otherwise
147 static bool batadv_is_on_batman_iface(const struct net_device *net_dev)
149 struct net *net = dev_net(net_dev);
150 struct net_device *parent_dev;
151 struct net *parent_net;
155 /* check if this is a batman-adv mesh interface */
156 if (batadv_softif_is_valid(net_dev))
159 iflink = dev_get_iflink(net_dev);
163 parent_net = batadv_getlink_net(net_dev, net);
165 /* iflink to itself, most likely physical device */
166 if (net == parent_net && iflink == net_dev->ifindex)
169 /* recurse over the parent device */
170 parent_dev = __dev_get_by_index((struct net *)parent_net, iflink);
172 pr_warn("Cannot find parent device. Skipping batadv-on-batadv check for %s\n",
177 if (batadv_mutual_parents(net_dev, net, parent_dev, parent_net))
180 ret = batadv_is_on_batman_iface(parent_dev);
185 static bool batadv_is_valid_iface(const struct net_device *net_dev)
187 if (net_dev->flags & IFF_LOOPBACK)
190 if (net_dev->type != ARPHRD_ETHER)
193 if (net_dev->addr_len != ETH_ALEN)
196 /* no batman over batman */
197 if (batadv_is_on_batman_iface(net_dev))
204 * batadv_get_real_netdevice() - check if the given netdev struct is a virtual
205 * interface on top of another 'real' interface
206 * @netdev: the device to check
208 * Callers must hold the rtnl semaphore. You may want batadv_get_real_netdev()
211 * Return: the 'real' net device or the original net device and NULL in case
214 static struct net_device *batadv_get_real_netdevice(struct net_device *netdev)
216 struct batadv_hard_iface *hard_iface = NULL;
217 struct net_device *real_netdev = NULL;
218 struct net *real_net;
227 iflink = dev_get_iflink(netdev);
233 hard_iface = batadv_hardif_get_by_netdev(netdev);
234 if (!hard_iface || !hard_iface->soft_iface)
237 net = dev_net(hard_iface->soft_iface);
238 real_net = batadv_getlink_net(netdev, net);
240 /* iflink to itself, most likely physical device */
241 if (net == real_net && netdev->ifindex == iflink) {
242 real_netdev = netdev;
243 dev_hold(real_netdev);
247 real_netdev = dev_get_by_index(real_net, iflink);
250 batadv_hardif_put(hard_iface);
255 * batadv_get_real_netdev() - check if the given net_device struct is a virtual
256 * interface on top of another 'real' interface
257 * @net_device: the device to check
259 * Return: the 'real' net device or the original net device and NULL in case
262 struct net_device *batadv_get_real_netdev(struct net_device *net_device)
264 struct net_device *real_netdev;
267 real_netdev = batadv_get_real_netdevice(net_device);
274 * batadv_is_wext_netdev() - check if the given net_device struct is a
275 * wext wifi interface
276 * @net_device: the device to check
278 * Return: true if the net device is a wext wireless device, false
281 static bool batadv_is_wext_netdev(struct net_device *net_device)
286 #ifdef CONFIG_WIRELESS_EXT
287 /* pre-cfg80211 drivers have to implement WEXT, so it is possible to
288 * check for wireless_handlers != NULL
290 if (net_device->wireless_handlers)
298 * batadv_is_cfg80211_netdev() - check if the given net_device struct is a
299 * cfg80211 wifi interface
300 * @net_device: the device to check
302 * Return: true if the net device is a cfg80211 wireless device, false
305 static bool batadv_is_cfg80211_netdev(struct net_device *net_device)
310 #if IS_ENABLED(CONFIG_CFG80211)
311 /* cfg80211 drivers have to set ieee80211_ptr */
312 if (net_device->ieee80211_ptr)
320 * batadv_wifi_flags_evaluate() - calculate wifi flags for net_device
321 * @net_device: the device to check
323 * Return: batadv_hard_iface_wifi_flags flags of the device
325 static u32 batadv_wifi_flags_evaluate(struct net_device *net_device)
328 struct net_device *real_netdev;
330 if (batadv_is_wext_netdev(net_device))
331 wifi_flags |= BATADV_HARDIF_WIFI_WEXT_DIRECT;
333 if (batadv_is_cfg80211_netdev(net_device))
334 wifi_flags |= BATADV_HARDIF_WIFI_CFG80211_DIRECT;
336 real_netdev = batadv_get_real_netdevice(net_device);
340 if (real_netdev == net_device)
343 if (batadv_is_wext_netdev(real_netdev))
344 wifi_flags |= BATADV_HARDIF_WIFI_WEXT_INDIRECT;
346 if (batadv_is_cfg80211_netdev(real_netdev))
347 wifi_flags |= BATADV_HARDIF_WIFI_CFG80211_INDIRECT;
350 dev_put(real_netdev);
355 * batadv_is_cfg80211_hardif() - check if the given hardif is a cfg80211 wifi
357 * @hard_iface: the device to check
359 * Return: true if the net device is a cfg80211 wireless device, false
362 bool batadv_is_cfg80211_hardif(struct batadv_hard_iface *hard_iface)
364 u32 allowed_flags = 0;
366 allowed_flags |= BATADV_HARDIF_WIFI_CFG80211_DIRECT;
367 allowed_flags |= BATADV_HARDIF_WIFI_CFG80211_INDIRECT;
369 return !!(hard_iface->wifi_flags & allowed_flags);
373 * batadv_is_wifi_hardif() - check if the given hardif is a wifi interface
374 * @hard_iface: the device to check
376 * Return: true if the net device is a 802.11 wireless device, false otherwise.
378 bool batadv_is_wifi_hardif(struct batadv_hard_iface *hard_iface)
383 return hard_iface->wifi_flags != 0;
387 * batadv_hardif_no_broadcast() - check whether (re)broadcast is necessary
388 * @if_outgoing: the outgoing interface checked and considered for (re)broadcast
389 * @orig_addr: the originator of this packet
390 * @orig_neigh: originator address of the forwarder we just got the packet from
391 * (NULL if we originated)
393 * Checks whether a packet needs to be (re)broadcasted on the given interface.
396 * BATADV_HARDIF_BCAST_NORECIPIENT: No neighbor on interface
397 * BATADV_HARDIF_BCAST_DUPFWD: Just one neighbor, but it is the forwarder
398 * BATADV_HARDIF_BCAST_DUPORIG: Just one neighbor, but it is the originator
399 * BATADV_HARDIF_BCAST_OK: Several neighbors, must broadcast
401 int batadv_hardif_no_broadcast(struct batadv_hard_iface *if_outgoing,
402 u8 *orig_addr, u8 *orig_neigh)
404 struct batadv_hardif_neigh_node *hardif_neigh;
405 struct hlist_node *first;
406 int ret = BATADV_HARDIF_BCAST_OK;
410 /* 0 neighbors -> no (re)broadcast */
411 first = rcu_dereference(hlist_first_rcu(&if_outgoing->neigh_list));
413 ret = BATADV_HARDIF_BCAST_NORECIPIENT;
417 /* >1 neighbors -> (re)broadcast */
418 if (rcu_dereference(hlist_next_rcu(first)))
421 hardif_neigh = hlist_entry(first, struct batadv_hardif_neigh_node,
424 /* 1 neighbor, is the originator -> no rebroadcast */
425 if (orig_addr && batadv_compare_eth(hardif_neigh->orig, orig_addr)) {
426 ret = BATADV_HARDIF_BCAST_DUPORIG;
427 /* 1 neighbor, is the one we received from -> no rebroadcast */
428 } else if (orig_neigh &&
429 batadv_compare_eth(hardif_neigh->orig, orig_neigh)) {
430 ret = BATADV_HARDIF_BCAST_DUPFWD;
438 static struct batadv_hard_iface *
439 batadv_hardif_get_active(const struct net_device *soft_iface)
441 struct batadv_hard_iface *hard_iface;
444 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
445 if (hard_iface->soft_iface != soft_iface)
448 if (hard_iface->if_status == BATADV_IF_ACTIVE &&
449 kref_get_unless_zero(&hard_iface->refcount))
460 static void batadv_primary_if_update_addr(struct batadv_priv *bat_priv,
461 struct batadv_hard_iface *oldif)
463 struct batadv_hard_iface *primary_if;
465 primary_if = batadv_primary_if_get_selected(bat_priv);
469 batadv_dat_init_own_addr(bat_priv, primary_if);
470 batadv_bla_update_orig_address(bat_priv, primary_if, oldif);
472 batadv_hardif_put(primary_if);
475 static void batadv_primary_if_select(struct batadv_priv *bat_priv,
476 struct batadv_hard_iface *new_hard_iface)
478 struct batadv_hard_iface *curr_hard_iface;
483 kref_get(&new_hard_iface->refcount);
485 curr_hard_iface = rcu_replace_pointer(bat_priv->primary_if,
491 bat_priv->algo_ops->iface.primary_set(new_hard_iface);
492 batadv_primary_if_update_addr(bat_priv, curr_hard_iface);
495 batadv_hardif_put(curr_hard_iface);
499 batadv_hardif_is_iface_up(const struct batadv_hard_iface *hard_iface)
501 if (hard_iface->net_dev->flags & IFF_UP)
507 static void batadv_check_known_mac_addr(const struct net_device *net_dev)
509 const struct batadv_hard_iface *hard_iface;
512 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
513 if (hard_iface->if_status != BATADV_IF_ACTIVE &&
514 hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)
517 if (hard_iface->net_dev == net_dev)
520 if (!batadv_compare_eth(hard_iface->net_dev->dev_addr,
524 pr_warn("The newly added mac address (%pM) already exists on: %s\n",
525 net_dev->dev_addr, hard_iface->net_dev->name);
526 pr_warn("It is strongly recommended to keep mac addresses unique to avoid problems!\n");
532 * batadv_hardif_recalc_extra_skbroom() - Recalculate skbuff extra head/tailroom
533 * @soft_iface: netdev struct of the mesh interface
535 static void batadv_hardif_recalc_extra_skbroom(struct net_device *soft_iface)
537 const struct batadv_hard_iface *hard_iface;
538 unsigned short lower_header_len = ETH_HLEN;
539 unsigned short lower_headroom = 0;
540 unsigned short lower_tailroom = 0;
541 unsigned short needed_headroom;
544 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
545 if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
548 if (hard_iface->soft_iface != soft_iface)
551 lower_header_len = max_t(unsigned short, lower_header_len,
552 hard_iface->net_dev->hard_header_len);
554 lower_headroom = max_t(unsigned short, lower_headroom,
555 hard_iface->net_dev->needed_headroom);
557 lower_tailroom = max_t(unsigned short, lower_tailroom,
558 hard_iface->net_dev->needed_tailroom);
562 needed_headroom = lower_headroom + (lower_header_len - ETH_HLEN);
563 needed_headroom += batadv_max_header_len();
565 /* fragmentation headers don't strip the unicast/... header */
566 needed_headroom += sizeof(struct batadv_frag_packet);
568 soft_iface->needed_headroom = needed_headroom;
569 soft_iface->needed_tailroom = lower_tailroom;
573 * batadv_hardif_min_mtu() - Calculate maximum MTU for soft interface
574 * @soft_iface: netdev struct of the soft interface
576 * Return: MTU for the soft-interface (limited by the minimal MTU of all active
579 int batadv_hardif_min_mtu(struct net_device *soft_iface)
581 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
582 const struct batadv_hard_iface *hard_iface;
583 int min_mtu = INT_MAX;
586 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
587 if (hard_iface->if_status != BATADV_IF_ACTIVE &&
588 hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)
591 if (hard_iface->soft_iface != soft_iface)
594 min_mtu = min_t(int, hard_iface->net_dev->mtu, min_mtu);
598 if (atomic_read(&bat_priv->fragmentation) == 0)
601 /* with fragmentation enabled the maximum size of internally generated
602 * packets such as translation table exchanges or tvlv containers, etc
603 * has to be calculated
605 min_mtu = min_t(int, min_mtu, BATADV_FRAG_MAX_FRAG_SIZE);
606 min_mtu -= sizeof(struct batadv_frag_packet);
607 min_mtu *= BATADV_FRAG_MAX_FRAGMENTS;
610 /* report to the other components the maximum amount of bytes that
611 * batman-adv can send over the wire (without considering the payload
612 * overhead). For example, this value is used by TT to compute the
613 * maximum local table size
615 atomic_set(&bat_priv->packet_size_max, min_mtu);
617 /* the real soft-interface MTU is computed by removing the payload
618 * overhead from the maximum amount of bytes that was just computed.
620 * However batman-adv does not support MTUs bigger than ETH_DATA_LEN
622 return min_t(int, min_mtu - batadv_max_header_len(), ETH_DATA_LEN);
626 * batadv_update_min_mtu() - Adjusts the MTU if a new interface with a smaller
628 * @soft_iface: netdev struct of the soft interface
630 void batadv_update_min_mtu(struct net_device *soft_iface)
632 soft_iface->mtu = batadv_hardif_min_mtu(soft_iface);
634 /* Check if the local translate table should be cleaned up to match a
635 * new (and smaller) MTU.
637 batadv_tt_local_resize_to_mtu(soft_iface);
641 batadv_hardif_activate_interface(struct batadv_hard_iface *hard_iface)
643 struct batadv_priv *bat_priv;
644 struct batadv_hard_iface *primary_if = NULL;
646 if (hard_iface->if_status != BATADV_IF_INACTIVE)
649 bat_priv = netdev_priv(hard_iface->soft_iface);
651 bat_priv->algo_ops->iface.update_mac(hard_iface);
652 hard_iface->if_status = BATADV_IF_TO_BE_ACTIVATED;
654 /* the first active interface becomes our primary interface or
655 * the next active interface after the old primary interface was removed
657 primary_if = batadv_primary_if_get_selected(bat_priv);
659 batadv_primary_if_select(bat_priv, hard_iface);
661 batadv_info(hard_iface->soft_iface, "Interface activated: %s\n",
662 hard_iface->net_dev->name);
664 batadv_update_min_mtu(hard_iface->soft_iface);
666 if (bat_priv->algo_ops->iface.activate)
667 bat_priv->algo_ops->iface.activate(hard_iface);
670 batadv_hardif_put(primary_if);
674 batadv_hardif_deactivate_interface(struct batadv_hard_iface *hard_iface)
676 if (hard_iface->if_status != BATADV_IF_ACTIVE &&
677 hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)
680 hard_iface->if_status = BATADV_IF_INACTIVE;
682 batadv_info(hard_iface->soft_iface, "Interface deactivated: %s\n",
683 hard_iface->net_dev->name);
685 batadv_update_min_mtu(hard_iface->soft_iface);
689 * batadv_hardif_enable_interface() - Enslave hard interface to soft interface
690 * @hard_iface: hard interface to add to soft interface
691 * @soft_iface: netdev struct of the mesh interface
693 * Return: 0 on success or negative error number in case of failure
695 int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
696 struct net_device *soft_iface)
698 struct batadv_priv *bat_priv;
699 __be16 ethertype = htons(ETH_P_BATMAN);
700 int max_header_len = batadv_max_header_len();
703 if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
706 kref_get(&hard_iface->refcount);
708 dev_hold(soft_iface);
709 hard_iface->soft_iface = soft_iface;
710 bat_priv = netdev_priv(hard_iface->soft_iface);
712 ret = netdev_master_upper_dev_link(hard_iface->net_dev,
713 soft_iface, NULL, NULL, NULL);
717 ret = bat_priv->algo_ops->iface.enable(hard_iface);
721 hard_iface->if_status = BATADV_IF_INACTIVE;
723 kref_get(&hard_iface->refcount);
724 hard_iface->batman_adv_ptype.type = ethertype;
725 hard_iface->batman_adv_ptype.func = batadv_batman_skb_recv;
726 hard_iface->batman_adv_ptype.dev = hard_iface->net_dev;
727 dev_add_pack(&hard_iface->batman_adv_ptype);
729 batadv_info(hard_iface->soft_iface, "Adding interface: %s\n",
730 hard_iface->net_dev->name);
732 if (atomic_read(&bat_priv->fragmentation) &&
733 hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
734 batadv_info(hard_iface->soft_iface,
735 "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",
736 hard_iface->net_dev->name, hard_iface->net_dev->mtu,
737 ETH_DATA_LEN + max_header_len);
739 if (!atomic_read(&bat_priv->fragmentation) &&
740 hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
741 batadv_info(hard_iface->soft_iface,
742 "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",
743 hard_iface->net_dev->name, hard_iface->net_dev->mtu,
744 ETH_DATA_LEN + max_header_len);
746 if (batadv_hardif_is_iface_up(hard_iface))
747 batadv_hardif_activate_interface(hard_iface);
749 batadv_err(hard_iface->soft_iface,
750 "Not using interface %s (retrying later): interface not active\n",
751 hard_iface->net_dev->name);
753 batadv_hardif_recalc_extra_skbroom(soft_iface);
755 if (bat_priv->algo_ops->iface.enabled)
756 bat_priv->algo_ops->iface.enabled(hard_iface);
762 netdev_upper_dev_unlink(hard_iface->net_dev, soft_iface);
764 hard_iface->soft_iface = NULL;
766 batadv_hardif_put(hard_iface);
771 * batadv_hardif_cnt() - get number of interfaces enslaved to soft interface
772 * @soft_iface: soft interface to check
774 * This function is only using RCU for locking - the result can therefore be
775 * off when another function is modifying the list at the same time. The
776 * caller can use the rtnl_lock to make sure that the count is accurate.
778 * Return: number of connected/enslaved hard interfaces
780 static size_t batadv_hardif_cnt(const struct net_device *soft_iface)
782 struct batadv_hard_iface *hard_iface;
786 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
787 if (hard_iface->soft_iface != soft_iface)
798 * batadv_hardif_disable_interface() - Remove hard interface from soft interface
799 * @hard_iface: hard interface to be removed
801 void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface)
803 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
804 struct batadv_hard_iface *primary_if = NULL;
806 batadv_hardif_deactivate_interface(hard_iface);
808 if (hard_iface->if_status != BATADV_IF_INACTIVE)
811 batadv_info(hard_iface->soft_iface, "Removing interface: %s\n",
812 hard_iface->net_dev->name);
813 dev_remove_pack(&hard_iface->batman_adv_ptype);
814 batadv_hardif_put(hard_iface);
816 primary_if = batadv_primary_if_get_selected(bat_priv);
817 if (hard_iface == primary_if) {
818 struct batadv_hard_iface *new_if;
820 new_if = batadv_hardif_get_active(hard_iface->soft_iface);
821 batadv_primary_if_select(bat_priv, new_if);
823 batadv_hardif_put(new_if);
826 bat_priv->algo_ops->iface.disable(hard_iface);
827 hard_iface->if_status = BATADV_IF_NOT_IN_USE;
829 /* delete all references to this hard_iface */
830 batadv_purge_orig_ref(bat_priv);
831 batadv_purge_outstanding_packets(bat_priv, hard_iface);
832 dev_put(hard_iface->soft_iface);
834 netdev_upper_dev_unlink(hard_iface->net_dev, hard_iface->soft_iface);
835 batadv_hardif_recalc_extra_skbroom(hard_iface->soft_iface);
837 /* nobody uses this interface anymore */
838 if (batadv_hardif_cnt(hard_iface->soft_iface) <= 1)
839 batadv_gw_check_client_stop(bat_priv);
841 hard_iface->soft_iface = NULL;
842 batadv_hardif_put(hard_iface);
845 batadv_hardif_put(primary_if);
848 static struct batadv_hard_iface *
849 batadv_hardif_add_interface(struct net_device *net_dev)
851 struct batadv_hard_iface *hard_iface;
855 if (!batadv_is_valid_iface(net_dev))
860 hard_iface = kzalloc(sizeof(*hard_iface), GFP_ATOMIC);
864 hard_iface->net_dev = net_dev;
865 hard_iface->soft_iface = NULL;
866 hard_iface->if_status = BATADV_IF_NOT_IN_USE;
868 INIT_LIST_HEAD(&hard_iface->list);
869 INIT_HLIST_HEAD(&hard_iface->neigh_list);
871 mutex_init(&hard_iface->bat_iv.ogm_buff_mutex);
872 spin_lock_init(&hard_iface->neigh_list_lock);
873 kref_init(&hard_iface->refcount);
875 hard_iface->num_bcasts = BATADV_NUM_BCASTS_DEFAULT;
876 hard_iface->wifi_flags = batadv_wifi_flags_evaluate(net_dev);
877 if (batadv_is_wifi_hardif(hard_iface))
878 hard_iface->num_bcasts = BATADV_NUM_BCASTS_WIRELESS;
880 atomic_set(&hard_iface->hop_penalty, 0);
882 batadv_v_hardif_init(hard_iface);
884 batadv_check_known_mac_addr(hard_iface->net_dev);
885 kref_get(&hard_iface->refcount);
886 list_add_tail_rcu(&hard_iface->list, &batadv_hardif_list);
887 batadv_hardif_generation++;
897 static void batadv_hardif_remove_interface(struct batadv_hard_iface *hard_iface)
901 /* first deactivate interface */
902 if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
903 batadv_hardif_disable_interface(hard_iface);
905 if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
908 hard_iface->if_status = BATADV_IF_TO_BE_REMOVED;
909 batadv_hardif_put(hard_iface);
913 * batadv_hard_if_event_softif() - Handle events for soft interfaces
914 * @event: NETDEV_* event to handle
915 * @net_dev: net_device which generated an event
917 * Return: NOTIFY_* result
919 static int batadv_hard_if_event_softif(unsigned long event,
920 struct net_device *net_dev)
922 struct batadv_priv *bat_priv;
925 case NETDEV_REGISTER:
926 bat_priv = netdev_priv(net_dev);
927 batadv_softif_create_vlan(bat_priv, BATADV_NO_FLAGS);
934 static int batadv_hard_if_event(struct notifier_block *this,
935 unsigned long event, void *ptr)
937 struct net_device *net_dev = netdev_notifier_info_to_dev(ptr);
938 struct batadv_hard_iface *hard_iface;
939 struct batadv_hard_iface *primary_if = NULL;
940 struct batadv_priv *bat_priv;
942 if (batadv_softif_is_valid(net_dev))
943 return batadv_hard_if_event_softif(event, net_dev);
945 hard_iface = batadv_hardif_get_by_netdev(net_dev);
946 if (!hard_iface && (event == NETDEV_REGISTER ||
947 event == NETDEV_POST_TYPE_CHANGE))
948 hard_iface = batadv_hardif_add_interface(net_dev);
955 batadv_hardif_activate_interface(hard_iface);
957 case NETDEV_GOING_DOWN:
959 batadv_hardif_deactivate_interface(hard_iface);
961 case NETDEV_UNREGISTER:
962 case NETDEV_PRE_TYPE_CHANGE:
963 list_del_rcu(&hard_iface->list);
964 batadv_hardif_generation++;
966 batadv_hardif_remove_interface(hard_iface);
968 case NETDEV_CHANGEMTU:
969 if (hard_iface->soft_iface)
970 batadv_update_min_mtu(hard_iface->soft_iface);
972 case NETDEV_CHANGEADDR:
973 if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
976 batadv_check_known_mac_addr(hard_iface->net_dev);
978 bat_priv = netdev_priv(hard_iface->soft_iface);
979 bat_priv->algo_ops->iface.update_mac(hard_iface);
981 primary_if = batadv_primary_if_get_selected(bat_priv);
985 if (hard_iface == primary_if)
986 batadv_primary_if_update_addr(bat_priv, NULL);
988 case NETDEV_CHANGEUPPER:
989 hard_iface->wifi_flags = batadv_wifi_flags_evaluate(net_dev);
990 if (batadv_is_wifi_hardif(hard_iface))
991 hard_iface->num_bcasts = BATADV_NUM_BCASTS_WIRELESS;
998 batadv_hardif_put(hard_iface);
1000 batadv_hardif_put(primary_if);
1004 struct notifier_block batadv_hard_if_notifier = {
1005 .notifier_call = batadv_hard_if_event,