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/errno.h>
14 #include <linux/gfp.h>
16 #include <linux/if_arp.h>
17 #include <linux/if_ether.h>
18 #include <linux/kref.h>
19 #include <linux/limits.h>
20 #include <linux/list.h>
21 #include <linux/minmax.h>
22 #include <linux/mutex.h>
23 #include <linux/netdevice.h>
24 #include <linux/printk.h>
25 #include <linux/rculist.h>
26 #include <linux/rtnetlink.h>
27 #include <linux/slab.h>
28 #include <linux/spinlock.h>
29 #include <net/net_namespace.h>
30 #include <net/rtnetlink.h>
31 #include <uapi/linux/batadv_packet.h>
34 #include "bridge_loop_avoidance.h"
35 #include "distributed-arp-table.h"
36 #include "gateway_client.h"
38 #include "originator.h"
40 #include "soft-interface.h"
41 #include "translation-table.h"
44 * batadv_hardif_release() - release hard interface from lists and queue for
45 * free after rcu grace period
46 * @ref: kref pointer of the hard interface
48 void batadv_hardif_release(struct kref *ref)
50 struct batadv_hard_iface *hard_iface;
52 hard_iface = container_of(ref, struct batadv_hard_iface, refcount);
53 dev_put(hard_iface->net_dev);
55 kfree_rcu(hard_iface, rcu);
59 * batadv_hardif_get_by_netdev() - Get hard interface object of a net_device
60 * @net_dev: net_device to search for
62 * Return: batadv_hard_iface of net_dev (with increased refcnt), NULL on errors
64 struct batadv_hard_iface *
65 batadv_hardif_get_by_netdev(const struct net_device *net_dev)
67 struct batadv_hard_iface *hard_iface;
70 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
71 if (hard_iface->net_dev == net_dev &&
72 kref_get_unless_zero(&hard_iface->refcount))
84 * batadv_getlink_net() - return link net namespace (of use fallback)
85 * @netdev: net_device to check
86 * @fallback_net: return in case get_link_net is not available for @netdev
88 * Return: result of rtnl_link_ops->get_link_net or @fallback_net
90 static struct net *batadv_getlink_net(const struct net_device *netdev,
91 struct net *fallback_net)
93 if (!netdev->rtnl_link_ops)
96 if (!netdev->rtnl_link_ops->get_link_net)
99 return netdev->rtnl_link_ops->get_link_net(netdev);
103 * batadv_mutual_parents() - check if two devices are each others parent
105 * @net1: 1st devices netns
107 * @net2: 2nd devices netns
109 * veth devices come in pairs and each is the parent of the other!
111 * Return: true if the devices are each others parent, otherwise false
113 static bool batadv_mutual_parents(const struct net_device *dev1,
115 const struct net_device *dev2,
118 int dev1_parent_iflink = dev_get_iflink(dev1);
119 int dev2_parent_iflink = dev_get_iflink(dev2);
120 const struct net *dev1_parent_net;
121 const struct net *dev2_parent_net;
123 dev1_parent_net = batadv_getlink_net(dev1, net1);
124 dev2_parent_net = batadv_getlink_net(dev2, net2);
126 if (!dev1_parent_iflink || !dev2_parent_iflink)
129 return (dev1_parent_iflink == dev2->ifindex) &&
130 (dev2_parent_iflink == dev1->ifindex) &&
131 net_eq(dev1_parent_net, net2) &&
132 net_eq(dev2_parent_net, net1);
136 * batadv_is_on_batman_iface() - check if a device is a batman iface descendant
137 * @net_dev: the device to check
139 * If the user creates any virtual device on top of a batman-adv interface, it
140 * is important to prevent this new interface from being used to create a new
141 * mesh network (this behaviour would lead to a batman-over-batman
142 * configuration). This function recursively checks all the fathers of the
143 * device passed as argument looking for a batman-adv soft interface.
145 * Return: true if the device is descendant of a batman-adv mesh interface (or
146 * if it is a batman-adv interface itself), false otherwise
148 static bool batadv_is_on_batman_iface(const struct net_device *net_dev)
150 struct net *net = dev_net(net_dev);
151 struct net_device *parent_dev;
152 struct net *parent_net;
156 /* check if this is a batman-adv mesh interface */
157 if (batadv_softif_is_valid(net_dev))
160 iflink = dev_get_iflink(net_dev);
164 parent_net = batadv_getlink_net(net_dev, net);
166 /* iflink to itself, most likely physical device */
167 if (net == parent_net && iflink == net_dev->ifindex)
170 /* recurse over the parent device */
171 parent_dev = __dev_get_by_index((struct net *)parent_net, iflink);
173 pr_warn("Cannot find parent device. Skipping batadv-on-batadv check for %s\n",
178 if (batadv_mutual_parents(net_dev, net, parent_dev, parent_net))
181 ret = batadv_is_on_batman_iface(parent_dev);
186 static bool batadv_is_valid_iface(const struct net_device *net_dev)
188 if (net_dev->flags & IFF_LOOPBACK)
191 if (net_dev->type != ARPHRD_ETHER)
194 if (net_dev->addr_len != ETH_ALEN)
197 /* no batman over batman */
198 if (batadv_is_on_batman_iface(net_dev))
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
209 * Callers must hold the rtnl semaphore. You may want batadv_get_real_netdev()
212 * Return: the 'real' net device or the original net device and NULL in case
215 static struct net_device *batadv_get_real_netdevice(struct net_device *netdev)
217 struct batadv_hard_iface *hard_iface = NULL;
218 struct net_device *real_netdev = NULL;
219 struct net *real_net;
228 iflink = dev_get_iflink(netdev);
234 hard_iface = batadv_hardif_get_by_netdev(netdev);
235 if (!hard_iface || !hard_iface->soft_iface)
238 net = dev_net(hard_iface->soft_iface);
239 real_net = batadv_getlink_net(netdev, net);
241 /* iflink to itself, most likely physical device */
242 if (net == real_net && netdev->ifindex == iflink) {
243 real_netdev = netdev;
244 dev_hold(real_netdev);
248 real_netdev = dev_get_by_index(real_net, iflink);
251 batadv_hardif_put(hard_iface);
256 * batadv_get_real_netdev() - check if the given net_device struct is a virtual
257 * interface on top of another 'real' interface
258 * @net_device: the device to check
260 * Return: the 'real' net device or the original net device and NULL in case
263 struct net_device *batadv_get_real_netdev(struct net_device *net_device)
265 struct net_device *real_netdev;
268 real_netdev = batadv_get_real_netdevice(net_device);
275 * batadv_is_wext_netdev() - check if the given net_device struct is a
276 * wext wifi interface
277 * @net_device: the device to check
279 * Return: true if the net device is a wext wireless device, false
282 static bool batadv_is_wext_netdev(struct net_device *net_device)
287 #ifdef CONFIG_WIRELESS_EXT
288 /* pre-cfg80211 drivers have to implement WEXT, so it is possible to
289 * check for wireless_handlers != NULL
291 if (net_device->wireless_handlers)
299 * batadv_is_cfg80211_netdev() - check if the given net_device struct is a
300 * cfg80211 wifi interface
301 * @net_device: the device to check
303 * Return: true if the net device is a cfg80211 wireless device, false
306 static bool batadv_is_cfg80211_netdev(struct net_device *net_device)
311 #if IS_ENABLED(CONFIG_CFG80211)
312 /* cfg80211 drivers have to set ieee80211_ptr */
313 if (net_device->ieee80211_ptr)
321 * batadv_wifi_flags_evaluate() - calculate wifi flags for net_device
322 * @net_device: the device to check
324 * Return: batadv_hard_iface_wifi_flags flags of the device
326 static u32 batadv_wifi_flags_evaluate(struct net_device *net_device)
329 struct net_device *real_netdev;
331 if (batadv_is_wext_netdev(net_device))
332 wifi_flags |= BATADV_HARDIF_WIFI_WEXT_DIRECT;
334 if (batadv_is_cfg80211_netdev(net_device))
335 wifi_flags |= BATADV_HARDIF_WIFI_CFG80211_DIRECT;
337 real_netdev = batadv_get_real_netdevice(net_device);
341 if (real_netdev == net_device)
344 if (batadv_is_wext_netdev(real_netdev))
345 wifi_flags |= BATADV_HARDIF_WIFI_WEXT_INDIRECT;
347 if (batadv_is_cfg80211_netdev(real_netdev))
348 wifi_flags |= BATADV_HARDIF_WIFI_CFG80211_INDIRECT;
351 dev_put(real_netdev);
356 * batadv_is_cfg80211_hardif() - check if the given hardif is a cfg80211 wifi
358 * @hard_iface: the device to check
360 * Return: true if the net device is a cfg80211 wireless device, false
363 bool batadv_is_cfg80211_hardif(struct batadv_hard_iface *hard_iface)
365 u32 allowed_flags = 0;
367 allowed_flags |= BATADV_HARDIF_WIFI_CFG80211_DIRECT;
368 allowed_flags |= BATADV_HARDIF_WIFI_CFG80211_INDIRECT;
370 return !!(hard_iface->wifi_flags & allowed_flags);
374 * batadv_is_wifi_hardif() - check if the given hardif is a wifi interface
375 * @hard_iface: the device to check
377 * Return: true if the net device is a 802.11 wireless device, false otherwise.
379 bool batadv_is_wifi_hardif(struct batadv_hard_iface *hard_iface)
384 return hard_iface->wifi_flags != 0;
388 * batadv_hardif_no_broadcast() - check whether (re)broadcast is necessary
389 * @if_outgoing: the outgoing interface checked and considered for (re)broadcast
390 * @orig_addr: the originator of this packet
391 * @orig_neigh: originator address of the forwarder we just got the packet from
392 * (NULL if we originated)
394 * Checks whether a packet needs to be (re)broadcasted on the given interface.
397 * BATADV_HARDIF_BCAST_NORECIPIENT: No neighbor on interface
398 * BATADV_HARDIF_BCAST_DUPFWD: Just one neighbor, but it is the forwarder
399 * BATADV_HARDIF_BCAST_DUPORIG: Just one neighbor, but it is the originator
400 * BATADV_HARDIF_BCAST_OK: Several neighbors, must broadcast
402 int batadv_hardif_no_broadcast(struct batadv_hard_iface *if_outgoing,
403 u8 *orig_addr, u8 *orig_neigh)
405 struct batadv_hardif_neigh_node *hardif_neigh;
406 struct hlist_node *first;
407 int ret = BATADV_HARDIF_BCAST_OK;
411 /* 0 neighbors -> no (re)broadcast */
412 first = rcu_dereference(hlist_first_rcu(&if_outgoing->neigh_list));
414 ret = BATADV_HARDIF_BCAST_NORECIPIENT;
418 /* >1 neighbors -> (re)broadcast */
419 if (rcu_dereference(hlist_next_rcu(first)))
422 hardif_neigh = hlist_entry(first, struct batadv_hardif_neigh_node,
425 /* 1 neighbor, is the originator -> no rebroadcast */
426 if (orig_addr && batadv_compare_eth(hardif_neigh->orig, orig_addr)) {
427 ret = BATADV_HARDIF_BCAST_DUPORIG;
428 /* 1 neighbor, is the one we received from -> no rebroadcast */
429 } else if (orig_neigh &&
430 batadv_compare_eth(hardif_neigh->orig, orig_neigh)) {
431 ret = BATADV_HARDIF_BCAST_DUPFWD;
439 static struct batadv_hard_iface *
440 batadv_hardif_get_active(const struct net_device *soft_iface)
442 struct batadv_hard_iface *hard_iface;
445 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
446 if (hard_iface->soft_iface != soft_iface)
449 if (hard_iface->if_status == BATADV_IF_ACTIVE &&
450 kref_get_unless_zero(&hard_iface->refcount))
461 static void batadv_primary_if_update_addr(struct batadv_priv *bat_priv,
462 struct batadv_hard_iface *oldif)
464 struct batadv_hard_iface *primary_if;
466 primary_if = batadv_primary_if_get_selected(bat_priv);
470 batadv_dat_init_own_addr(bat_priv, primary_if);
471 batadv_bla_update_orig_address(bat_priv, primary_if, oldif);
473 batadv_hardif_put(primary_if);
476 static void batadv_primary_if_select(struct batadv_priv *bat_priv,
477 struct batadv_hard_iface *new_hard_iface)
479 struct batadv_hard_iface *curr_hard_iface;
484 kref_get(&new_hard_iface->refcount);
486 curr_hard_iface = rcu_replace_pointer(bat_priv->primary_if,
492 bat_priv->algo_ops->iface.primary_set(new_hard_iface);
493 batadv_primary_if_update_addr(bat_priv, curr_hard_iface);
496 batadv_hardif_put(curr_hard_iface);
500 batadv_hardif_is_iface_up(const struct batadv_hard_iface *hard_iface)
502 if (hard_iface->net_dev->flags & IFF_UP)
508 static void batadv_check_known_mac_addr(const struct net_device *net_dev)
510 const struct batadv_hard_iface *hard_iface;
513 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
514 if (hard_iface->if_status != BATADV_IF_ACTIVE &&
515 hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)
518 if (hard_iface->net_dev == net_dev)
521 if (!batadv_compare_eth(hard_iface->net_dev->dev_addr,
525 pr_warn("The newly added mac address (%pM) already exists on: %s\n",
526 net_dev->dev_addr, hard_iface->net_dev->name);
527 pr_warn("It is strongly recommended to keep mac addresses unique to avoid problems!\n");
533 * batadv_hardif_recalc_extra_skbroom() - Recalculate skbuff extra head/tailroom
534 * @soft_iface: netdev struct of the mesh interface
536 static void batadv_hardif_recalc_extra_skbroom(struct net_device *soft_iface)
538 const struct batadv_hard_iface *hard_iface;
539 unsigned short lower_header_len = ETH_HLEN;
540 unsigned short lower_headroom = 0;
541 unsigned short lower_tailroom = 0;
542 unsigned short needed_headroom;
545 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
546 if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
549 if (hard_iface->soft_iface != soft_iface)
552 lower_header_len = max_t(unsigned short, lower_header_len,
553 hard_iface->net_dev->hard_header_len);
555 lower_headroom = max_t(unsigned short, lower_headroom,
556 hard_iface->net_dev->needed_headroom);
558 lower_tailroom = max_t(unsigned short, lower_tailroom,
559 hard_iface->net_dev->needed_tailroom);
563 needed_headroom = lower_headroom + (lower_header_len - ETH_HLEN);
564 needed_headroom += batadv_max_header_len();
566 /* fragmentation headers don't strip the unicast/... header */
567 needed_headroom += sizeof(struct batadv_frag_packet);
569 soft_iface->needed_headroom = needed_headroom;
570 soft_iface->needed_tailroom = lower_tailroom;
574 * batadv_hardif_min_mtu() - Calculate maximum MTU for soft interface
575 * @soft_iface: netdev struct of the soft interface
577 * Return: MTU for the soft-interface (limited by the minimal MTU of all active
580 int batadv_hardif_min_mtu(struct net_device *soft_iface)
582 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
583 const struct batadv_hard_iface *hard_iface;
584 int min_mtu = INT_MAX;
587 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
588 if (hard_iface->if_status != BATADV_IF_ACTIVE &&
589 hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)
592 if (hard_iface->soft_iface != soft_iface)
595 min_mtu = min_t(int, hard_iface->net_dev->mtu, min_mtu);
599 if (atomic_read(&bat_priv->fragmentation) == 0)
602 /* with fragmentation enabled the maximum size of internally generated
603 * packets such as translation table exchanges or tvlv containers, etc
604 * has to be calculated
606 min_mtu = min_t(int, min_mtu, BATADV_FRAG_MAX_FRAG_SIZE);
607 min_mtu -= sizeof(struct batadv_frag_packet);
608 min_mtu *= BATADV_FRAG_MAX_FRAGMENTS;
611 /* report to the other components the maximum amount of bytes that
612 * batman-adv can send over the wire (without considering the payload
613 * overhead). For example, this value is used by TT to compute the
614 * maximum local table size
616 atomic_set(&bat_priv->packet_size_max, min_mtu);
618 /* the real soft-interface MTU is computed by removing the payload
619 * overhead from the maximum amount of bytes that was just computed.
621 * However batman-adv does not support MTUs bigger than ETH_DATA_LEN
623 return min_t(int, min_mtu - batadv_max_header_len(), ETH_DATA_LEN);
627 * batadv_update_min_mtu() - Adjusts the MTU if a new interface with a smaller
629 * @soft_iface: netdev struct of the soft interface
631 void batadv_update_min_mtu(struct net_device *soft_iface)
633 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
637 mtu = batadv_hardif_min_mtu(soft_iface);
639 if (bat_priv->mtu_set_by_user)
640 limit_mtu = bat_priv->mtu_set_by_user;
642 limit_mtu = ETH_DATA_LEN;
644 mtu = min(mtu, limit_mtu);
645 dev_set_mtu(soft_iface, mtu);
647 /* Check if the local translate table should be cleaned up to match a
648 * new (and smaller) MTU.
650 batadv_tt_local_resize_to_mtu(soft_iface);
654 batadv_hardif_activate_interface(struct batadv_hard_iface *hard_iface)
656 struct batadv_priv *bat_priv;
657 struct batadv_hard_iface *primary_if = NULL;
659 if (hard_iface->if_status != BATADV_IF_INACTIVE)
662 bat_priv = netdev_priv(hard_iface->soft_iface);
664 bat_priv->algo_ops->iface.update_mac(hard_iface);
665 hard_iface->if_status = BATADV_IF_TO_BE_ACTIVATED;
667 /* the first active interface becomes our primary interface or
668 * the next active interface after the old primary interface was removed
670 primary_if = batadv_primary_if_get_selected(bat_priv);
672 batadv_primary_if_select(bat_priv, hard_iface);
674 batadv_info(hard_iface->soft_iface, "Interface activated: %s\n",
675 hard_iface->net_dev->name);
677 batadv_update_min_mtu(hard_iface->soft_iface);
679 if (bat_priv->algo_ops->iface.activate)
680 bat_priv->algo_ops->iface.activate(hard_iface);
683 batadv_hardif_put(primary_if);
687 batadv_hardif_deactivate_interface(struct batadv_hard_iface *hard_iface)
689 if (hard_iface->if_status != BATADV_IF_ACTIVE &&
690 hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)
693 hard_iface->if_status = BATADV_IF_INACTIVE;
695 batadv_info(hard_iface->soft_iface, "Interface deactivated: %s\n",
696 hard_iface->net_dev->name);
698 batadv_update_min_mtu(hard_iface->soft_iface);
702 * batadv_hardif_enable_interface() - Enslave hard interface to soft interface
703 * @hard_iface: hard interface to add to soft interface
704 * @soft_iface: netdev struct of the mesh interface
706 * Return: 0 on success or negative error number in case of failure
708 int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
709 struct net_device *soft_iface)
711 struct batadv_priv *bat_priv;
712 __be16 ethertype = htons(ETH_P_BATMAN);
713 int max_header_len = batadv_max_header_len();
716 if (hard_iface->net_dev->mtu < ETH_MIN_MTU + max_header_len)
719 if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
722 kref_get(&hard_iface->refcount);
724 dev_hold(soft_iface);
725 hard_iface->soft_iface = soft_iface;
726 bat_priv = netdev_priv(hard_iface->soft_iface);
728 ret = netdev_master_upper_dev_link(hard_iface->net_dev,
729 soft_iface, NULL, NULL, NULL);
733 ret = bat_priv->algo_ops->iface.enable(hard_iface);
737 hard_iface->if_status = BATADV_IF_INACTIVE;
739 kref_get(&hard_iface->refcount);
740 hard_iface->batman_adv_ptype.type = ethertype;
741 hard_iface->batman_adv_ptype.func = batadv_batman_skb_recv;
742 hard_iface->batman_adv_ptype.dev = hard_iface->net_dev;
743 dev_add_pack(&hard_iface->batman_adv_ptype);
745 batadv_info(hard_iface->soft_iface, "Adding interface: %s\n",
746 hard_iface->net_dev->name);
748 if (atomic_read(&bat_priv->fragmentation) &&
749 hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
750 batadv_info(hard_iface->soft_iface,
751 "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",
752 hard_iface->net_dev->name, hard_iface->net_dev->mtu,
753 ETH_DATA_LEN + max_header_len);
755 if (!atomic_read(&bat_priv->fragmentation) &&
756 hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
757 batadv_info(hard_iface->soft_iface,
758 "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",
759 hard_iface->net_dev->name, hard_iface->net_dev->mtu,
760 ETH_DATA_LEN + max_header_len);
762 if (batadv_hardif_is_iface_up(hard_iface))
763 batadv_hardif_activate_interface(hard_iface);
765 batadv_err(hard_iface->soft_iface,
766 "Not using interface %s (retrying later): interface not active\n",
767 hard_iface->net_dev->name);
769 batadv_hardif_recalc_extra_skbroom(soft_iface);
771 if (bat_priv->algo_ops->iface.enabled)
772 bat_priv->algo_ops->iface.enabled(hard_iface);
778 netdev_upper_dev_unlink(hard_iface->net_dev, soft_iface);
780 hard_iface->soft_iface = NULL;
782 batadv_hardif_put(hard_iface);
787 * batadv_hardif_cnt() - get number of interfaces enslaved to soft interface
788 * @soft_iface: soft interface to check
790 * This function is only using RCU for locking - the result can therefore be
791 * off when another function is modifying the list at the same time. The
792 * caller can use the rtnl_lock to make sure that the count is accurate.
794 * Return: number of connected/enslaved hard interfaces
796 static size_t batadv_hardif_cnt(const struct net_device *soft_iface)
798 struct batadv_hard_iface *hard_iface;
802 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
803 if (hard_iface->soft_iface != soft_iface)
814 * batadv_hardif_disable_interface() - Remove hard interface from soft interface
815 * @hard_iface: hard interface to be removed
817 void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface)
819 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
820 struct batadv_hard_iface *primary_if = NULL;
822 batadv_hardif_deactivate_interface(hard_iface);
824 if (hard_iface->if_status != BATADV_IF_INACTIVE)
827 batadv_info(hard_iface->soft_iface, "Removing interface: %s\n",
828 hard_iface->net_dev->name);
829 dev_remove_pack(&hard_iface->batman_adv_ptype);
830 batadv_hardif_put(hard_iface);
832 primary_if = batadv_primary_if_get_selected(bat_priv);
833 if (hard_iface == primary_if) {
834 struct batadv_hard_iface *new_if;
836 new_if = batadv_hardif_get_active(hard_iface->soft_iface);
837 batadv_primary_if_select(bat_priv, new_if);
839 batadv_hardif_put(new_if);
842 bat_priv->algo_ops->iface.disable(hard_iface);
843 hard_iface->if_status = BATADV_IF_NOT_IN_USE;
845 /* delete all references to this hard_iface */
846 batadv_purge_orig_ref(bat_priv);
847 batadv_purge_outstanding_packets(bat_priv, hard_iface);
848 dev_put(hard_iface->soft_iface);
850 netdev_upper_dev_unlink(hard_iface->net_dev, hard_iface->soft_iface);
851 batadv_hardif_recalc_extra_skbroom(hard_iface->soft_iface);
853 /* nobody uses this interface anymore */
854 if (batadv_hardif_cnt(hard_iface->soft_iface) <= 1)
855 batadv_gw_check_client_stop(bat_priv);
857 hard_iface->soft_iface = NULL;
858 batadv_hardif_put(hard_iface);
861 batadv_hardif_put(primary_if);
864 static struct batadv_hard_iface *
865 batadv_hardif_add_interface(struct net_device *net_dev)
867 struct batadv_hard_iface *hard_iface;
871 if (!batadv_is_valid_iface(net_dev))
876 hard_iface = kzalloc(sizeof(*hard_iface), GFP_ATOMIC);
880 hard_iface->net_dev = net_dev;
881 hard_iface->soft_iface = NULL;
882 hard_iface->if_status = BATADV_IF_NOT_IN_USE;
884 INIT_LIST_HEAD(&hard_iface->list);
885 INIT_HLIST_HEAD(&hard_iface->neigh_list);
887 mutex_init(&hard_iface->bat_iv.ogm_buff_mutex);
888 spin_lock_init(&hard_iface->neigh_list_lock);
889 kref_init(&hard_iface->refcount);
891 hard_iface->num_bcasts = BATADV_NUM_BCASTS_DEFAULT;
892 hard_iface->wifi_flags = batadv_wifi_flags_evaluate(net_dev);
893 if (batadv_is_wifi_hardif(hard_iface))
894 hard_iface->num_bcasts = BATADV_NUM_BCASTS_WIRELESS;
896 atomic_set(&hard_iface->hop_penalty, 0);
898 batadv_v_hardif_init(hard_iface);
900 batadv_check_known_mac_addr(hard_iface->net_dev);
901 kref_get(&hard_iface->refcount);
902 list_add_tail_rcu(&hard_iface->list, &batadv_hardif_list);
903 batadv_hardif_generation++;
913 static void batadv_hardif_remove_interface(struct batadv_hard_iface *hard_iface)
917 /* first deactivate interface */
918 if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
919 batadv_hardif_disable_interface(hard_iface);
921 if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
924 hard_iface->if_status = BATADV_IF_TO_BE_REMOVED;
925 batadv_hardif_put(hard_iface);
929 * batadv_hard_if_event_softif() - Handle events for soft interfaces
930 * @event: NETDEV_* event to handle
931 * @net_dev: net_device which generated an event
933 * Return: NOTIFY_* result
935 static int batadv_hard_if_event_softif(unsigned long event,
936 struct net_device *net_dev)
938 struct batadv_priv *bat_priv;
941 case NETDEV_REGISTER:
942 bat_priv = netdev_priv(net_dev);
943 batadv_softif_create_vlan(bat_priv, BATADV_NO_FLAGS);
950 static int batadv_hard_if_event(struct notifier_block *this,
951 unsigned long event, void *ptr)
953 struct net_device *net_dev = netdev_notifier_info_to_dev(ptr);
954 struct batadv_hard_iface *hard_iface;
955 struct batadv_hard_iface *primary_if = NULL;
956 struct batadv_priv *bat_priv;
958 if (batadv_softif_is_valid(net_dev))
959 return batadv_hard_if_event_softif(event, net_dev);
961 hard_iface = batadv_hardif_get_by_netdev(net_dev);
962 if (!hard_iface && (event == NETDEV_REGISTER ||
963 event == NETDEV_POST_TYPE_CHANGE))
964 hard_iface = batadv_hardif_add_interface(net_dev);
971 batadv_hardif_activate_interface(hard_iface);
973 case NETDEV_GOING_DOWN:
975 batadv_hardif_deactivate_interface(hard_iface);
977 case NETDEV_UNREGISTER:
978 case NETDEV_PRE_TYPE_CHANGE:
979 list_del_rcu(&hard_iface->list);
980 batadv_hardif_generation++;
982 batadv_hardif_remove_interface(hard_iface);
984 case NETDEV_CHANGEMTU:
985 if (hard_iface->soft_iface)
986 batadv_update_min_mtu(hard_iface->soft_iface);
988 case NETDEV_CHANGEADDR:
989 if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
992 batadv_check_known_mac_addr(hard_iface->net_dev);
994 bat_priv = netdev_priv(hard_iface->soft_iface);
995 bat_priv->algo_ops->iface.update_mac(hard_iface);
997 primary_if = batadv_primary_if_get_selected(bat_priv);
1001 if (hard_iface == primary_if)
1002 batadv_primary_if_update_addr(bat_priv, NULL);
1004 case NETDEV_CHANGEUPPER:
1005 hard_iface->wifi_flags = batadv_wifi_flags_evaluate(net_dev);
1006 if (batadv_is_wifi_hardif(hard_iface))
1007 hard_iface->num_bcasts = BATADV_NUM_BCASTS_WIRELESS;
1014 batadv_hardif_put(hard_iface);
1016 batadv_hardif_put(primary_if);
1020 struct notifier_block batadv_hard_if_notifier = {
1021 .notifier_call = batadv_hard_if_event,