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/gfp.h>
14 #include <linux/if_arp.h>
15 #include <linux/if_ether.h>
16 #include <linux/kernel.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;
154 /* check if this is a batman-adv mesh interface */
155 if (batadv_softif_is_valid(net_dev))
158 /* no more parents..stop recursion */
159 if (dev_get_iflink(net_dev) == 0 ||
160 dev_get_iflink(net_dev) == net_dev->ifindex)
163 parent_net = batadv_getlink_net(net_dev, net);
165 /* recurse over the parent device */
166 parent_dev = __dev_get_by_index((struct net *)parent_net,
167 dev_get_iflink(net_dev));
168 /* if we got a NULL parent_dev there is something broken.. */
170 pr_err("Cannot find parent device\n");
174 if (batadv_mutual_parents(net_dev, net, parent_dev, parent_net))
177 ret = batadv_is_on_batman_iface(parent_dev);
182 static bool batadv_is_valid_iface(const struct net_device *net_dev)
184 if (net_dev->flags & IFF_LOOPBACK)
187 if (net_dev->type != ARPHRD_ETHER)
190 if (net_dev->addr_len != ETH_ALEN)
193 /* no batman over batman */
194 if (batadv_is_on_batman_iface(net_dev))
201 * batadv_get_real_netdevice() - check if the given netdev struct is a virtual
202 * interface on top of another 'real' interface
203 * @netdev: the device to check
205 * Callers must hold the rtnl semaphore. You may want batadv_get_real_netdev()
208 * Return: the 'real' net device or the original net device and NULL in case
211 static struct net_device *batadv_get_real_netdevice(struct net_device *netdev)
213 struct batadv_hard_iface *hard_iface = NULL;
214 struct net_device *real_netdev = NULL;
215 struct net *real_net;
224 if (netdev->ifindex == dev_get_iflink(netdev)) {
229 hard_iface = batadv_hardif_get_by_netdev(netdev);
230 if (!hard_iface || !hard_iface->soft_iface)
233 net = dev_net(hard_iface->soft_iface);
234 ifindex = dev_get_iflink(netdev);
235 real_net = batadv_getlink_net(netdev, net);
236 real_netdev = dev_get_by_index(real_net, ifindex);
240 batadv_hardif_put(hard_iface);
245 * batadv_get_real_netdev() - check if the given net_device struct is a virtual
246 * interface on top of another 'real' interface
247 * @net_device: the device to check
249 * Return: the 'real' net device or the original net device and NULL in case
252 struct net_device *batadv_get_real_netdev(struct net_device *net_device)
254 struct net_device *real_netdev;
257 real_netdev = batadv_get_real_netdevice(net_device);
264 * batadv_is_wext_netdev() - check if the given net_device struct is a
265 * wext wifi interface
266 * @net_device: the device to check
268 * Return: true if the net device is a wext wireless device, false
271 static bool batadv_is_wext_netdev(struct net_device *net_device)
276 #ifdef CONFIG_WIRELESS_EXT
277 /* pre-cfg80211 drivers have to implement WEXT, so it is possible to
278 * check for wireless_handlers != NULL
280 if (net_device->wireless_handlers)
288 * batadv_is_cfg80211_netdev() - check if the given net_device struct is a
289 * cfg80211 wifi interface
290 * @net_device: the device to check
292 * Return: true if the net device is a cfg80211 wireless device, false
295 static bool batadv_is_cfg80211_netdev(struct net_device *net_device)
300 /* cfg80211 drivers have to set ieee80211_ptr */
301 if (net_device->ieee80211_ptr)
308 * batadv_wifi_flags_evaluate() - calculate wifi flags for net_device
309 * @net_device: the device to check
311 * Return: batadv_hard_iface_wifi_flags flags of the device
313 static u32 batadv_wifi_flags_evaluate(struct net_device *net_device)
316 struct net_device *real_netdev;
318 if (batadv_is_wext_netdev(net_device))
319 wifi_flags |= BATADV_HARDIF_WIFI_WEXT_DIRECT;
321 if (batadv_is_cfg80211_netdev(net_device))
322 wifi_flags |= BATADV_HARDIF_WIFI_CFG80211_DIRECT;
324 real_netdev = batadv_get_real_netdevice(net_device);
328 if (real_netdev == net_device)
331 if (batadv_is_wext_netdev(real_netdev))
332 wifi_flags |= BATADV_HARDIF_WIFI_WEXT_INDIRECT;
334 if (batadv_is_cfg80211_netdev(real_netdev))
335 wifi_flags |= BATADV_HARDIF_WIFI_CFG80211_INDIRECT;
338 dev_put(real_netdev);
343 * batadv_is_cfg80211_hardif() - check if the given hardif is a cfg80211 wifi
345 * @hard_iface: the device to check
347 * Return: true if the net device is a cfg80211 wireless device, false
350 bool batadv_is_cfg80211_hardif(struct batadv_hard_iface *hard_iface)
352 u32 allowed_flags = 0;
354 allowed_flags |= BATADV_HARDIF_WIFI_CFG80211_DIRECT;
355 allowed_flags |= BATADV_HARDIF_WIFI_CFG80211_INDIRECT;
357 return !!(hard_iface->wifi_flags & allowed_flags);
361 * batadv_is_wifi_hardif() - check if the given hardif is a wifi interface
362 * @hard_iface: the device to check
364 * Return: true if the net device is a 802.11 wireless device, false otherwise.
366 bool batadv_is_wifi_hardif(struct batadv_hard_iface *hard_iface)
371 return hard_iface->wifi_flags != 0;
375 * batadv_hardif_no_broadcast() - check whether (re)broadcast is necessary
376 * @if_outgoing: the outgoing interface checked and considered for (re)broadcast
377 * @orig_addr: the originator of this packet
378 * @orig_neigh: originator address of the forwarder we just got the packet from
379 * (NULL if we originated)
381 * Checks whether a packet needs to be (re)broadcasted on the given interface.
384 * BATADV_HARDIF_BCAST_NORECIPIENT: No neighbor on interface
385 * BATADV_HARDIF_BCAST_DUPFWD: Just one neighbor, but it is the forwarder
386 * BATADV_HARDIF_BCAST_DUPORIG: Just one neighbor, but it is the originator
387 * BATADV_HARDIF_BCAST_OK: Several neighbors, must broadcast
389 int batadv_hardif_no_broadcast(struct batadv_hard_iface *if_outgoing,
390 u8 *orig_addr, u8 *orig_neigh)
392 struct batadv_hardif_neigh_node *hardif_neigh;
393 struct hlist_node *first;
394 int ret = BATADV_HARDIF_BCAST_OK;
398 /* 0 neighbors -> no (re)broadcast */
399 first = rcu_dereference(hlist_first_rcu(&if_outgoing->neigh_list));
401 ret = BATADV_HARDIF_BCAST_NORECIPIENT;
405 /* >1 neighbors -> (re)broadcast */
406 if (rcu_dereference(hlist_next_rcu(first)))
409 hardif_neigh = hlist_entry(first, struct batadv_hardif_neigh_node,
412 /* 1 neighbor, is the originator -> no rebroadcast */
413 if (orig_addr && batadv_compare_eth(hardif_neigh->orig, orig_addr)) {
414 ret = BATADV_HARDIF_BCAST_DUPORIG;
415 /* 1 neighbor, is the one we received from -> no rebroadcast */
416 } else if (orig_neigh &&
417 batadv_compare_eth(hardif_neigh->orig, orig_neigh)) {
418 ret = BATADV_HARDIF_BCAST_DUPFWD;
426 static struct batadv_hard_iface *
427 batadv_hardif_get_active(const struct net_device *soft_iface)
429 struct batadv_hard_iface *hard_iface;
432 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
433 if (hard_iface->soft_iface != soft_iface)
436 if (hard_iface->if_status == BATADV_IF_ACTIVE &&
437 kref_get_unless_zero(&hard_iface->refcount))
448 static void batadv_primary_if_update_addr(struct batadv_priv *bat_priv,
449 struct batadv_hard_iface *oldif)
451 struct batadv_hard_iface *primary_if;
453 primary_if = batadv_primary_if_get_selected(bat_priv);
457 batadv_dat_init_own_addr(bat_priv, primary_if);
458 batadv_bla_update_orig_address(bat_priv, primary_if, oldif);
461 batadv_hardif_put(primary_if);
464 static void batadv_primary_if_select(struct batadv_priv *bat_priv,
465 struct batadv_hard_iface *new_hard_iface)
467 struct batadv_hard_iface *curr_hard_iface;
472 kref_get(&new_hard_iface->refcount);
474 curr_hard_iface = rcu_replace_pointer(bat_priv->primary_if,
480 bat_priv->algo_ops->iface.primary_set(new_hard_iface);
481 batadv_primary_if_update_addr(bat_priv, curr_hard_iface);
485 batadv_hardif_put(curr_hard_iface);
489 batadv_hardif_is_iface_up(const struct batadv_hard_iface *hard_iface)
491 if (hard_iface->net_dev->flags & IFF_UP)
497 static void batadv_check_known_mac_addr(const struct net_device *net_dev)
499 const struct batadv_hard_iface *hard_iface;
502 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
503 if (hard_iface->if_status != BATADV_IF_ACTIVE &&
504 hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)
507 if (hard_iface->net_dev == net_dev)
510 if (!batadv_compare_eth(hard_iface->net_dev->dev_addr,
514 pr_warn("The newly added mac address (%pM) already exists on: %s\n",
515 net_dev->dev_addr, hard_iface->net_dev->name);
516 pr_warn("It is strongly recommended to keep mac addresses unique to avoid problems!\n");
522 * batadv_hardif_recalc_extra_skbroom() - Recalculate skbuff extra head/tailroom
523 * @soft_iface: netdev struct of the mesh interface
525 static void batadv_hardif_recalc_extra_skbroom(struct net_device *soft_iface)
527 const struct batadv_hard_iface *hard_iface;
528 unsigned short lower_header_len = ETH_HLEN;
529 unsigned short lower_headroom = 0;
530 unsigned short lower_tailroom = 0;
531 unsigned short needed_headroom;
534 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
535 if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
538 if (hard_iface->soft_iface != soft_iface)
541 lower_header_len = max_t(unsigned short, lower_header_len,
542 hard_iface->net_dev->hard_header_len);
544 lower_headroom = max_t(unsigned short, lower_headroom,
545 hard_iface->net_dev->needed_headroom);
547 lower_tailroom = max_t(unsigned short, lower_tailroom,
548 hard_iface->net_dev->needed_tailroom);
552 needed_headroom = lower_headroom + (lower_header_len - ETH_HLEN);
553 needed_headroom += batadv_max_header_len();
555 /* fragmentation headers don't strip the unicast/... header */
556 needed_headroom += sizeof(struct batadv_frag_packet);
558 soft_iface->needed_headroom = needed_headroom;
559 soft_iface->needed_tailroom = lower_tailroom;
563 * batadv_hardif_min_mtu() - Calculate maximum MTU for soft interface
564 * @soft_iface: netdev struct of the soft interface
566 * Return: MTU for the soft-interface (limited by the minimal MTU of all active
569 int batadv_hardif_min_mtu(struct net_device *soft_iface)
571 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
572 const struct batadv_hard_iface *hard_iface;
573 int min_mtu = INT_MAX;
576 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
577 if (hard_iface->if_status != BATADV_IF_ACTIVE &&
578 hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)
581 if (hard_iface->soft_iface != soft_iface)
584 min_mtu = min_t(int, hard_iface->net_dev->mtu, min_mtu);
588 if (atomic_read(&bat_priv->fragmentation) == 0)
591 /* with fragmentation enabled the maximum size of internally generated
592 * packets such as translation table exchanges or tvlv containers, etc
593 * has to be calculated
595 min_mtu = min_t(int, min_mtu, BATADV_FRAG_MAX_FRAG_SIZE);
596 min_mtu -= sizeof(struct batadv_frag_packet);
597 min_mtu *= BATADV_FRAG_MAX_FRAGMENTS;
600 /* report to the other components the maximum amount of bytes that
601 * batman-adv can send over the wire (without considering the payload
602 * overhead). For example, this value is used by TT to compute the
603 * maximum local table size
605 atomic_set(&bat_priv->packet_size_max, min_mtu);
607 /* the real soft-interface MTU is computed by removing the payload
608 * overhead from the maximum amount of bytes that was just computed.
610 * However batman-adv does not support MTUs bigger than ETH_DATA_LEN
612 return min_t(int, min_mtu - batadv_max_header_len(), ETH_DATA_LEN);
616 * batadv_update_min_mtu() - Adjusts the MTU if a new interface with a smaller
618 * @soft_iface: netdev struct of the soft interface
620 void batadv_update_min_mtu(struct net_device *soft_iface)
622 soft_iface->mtu = batadv_hardif_min_mtu(soft_iface);
624 /* Check if the local translate table should be cleaned up to match a
625 * new (and smaller) MTU.
627 batadv_tt_local_resize_to_mtu(soft_iface);
631 batadv_hardif_activate_interface(struct batadv_hard_iface *hard_iface)
633 struct batadv_priv *bat_priv;
634 struct batadv_hard_iface *primary_if = NULL;
636 if (hard_iface->if_status != BATADV_IF_INACTIVE)
639 bat_priv = netdev_priv(hard_iface->soft_iface);
641 bat_priv->algo_ops->iface.update_mac(hard_iface);
642 hard_iface->if_status = BATADV_IF_TO_BE_ACTIVATED;
644 /* the first active interface becomes our primary interface or
645 * the next active interface after the old primary interface was removed
647 primary_if = batadv_primary_if_get_selected(bat_priv);
649 batadv_primary_if_select(bat_priv, hard_iface);
651 batadv_info(hard_iface->soft_iface, "Interface activated: %s\n",
652 hard_iface->net_dev->name);
654 batadv_update_min_mtu(hard_iface->soft_iface);
656 if (bat_priv->algo_ops->iface.activate)
657 bat_priv->algo_ops->iface.activate(hard_iface);
661 batadv_hardif_put(primary_if);
665 batadv_hardif_deactivate_interface(struct batadv_hard_iface *hard_iface)
667 if (hard_iface->if_status != BATADV_IF_ACTIVE &&
668 hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)
671 hard_iface->if_status = BATADV_IF_INACTIVE;
673 batadv_info(hard_iface->soft_iface, "Interface deactivated: %s\n",
674 hard_iface->net_dev->name);
676 batadv_update_min_mtu(hard_iface->soft_iface);
680 * batadv_hardif_enable_interface() - Enslave hard interface to soft interface
681 * @hard_iface: hard interface to add to soft interface
682 * @soft_iface: netdev struct of the mesh interface
684 * Return: 0 on success or negative error number in case of failure
686 int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
687 struct net_device *soft_iface)
689 struct batadv_priv *bat_priv;
690 __be16 ethertype = htons(ETH_P_BATMAN);
691 int max_header_len = batadv_max_header_len();
694 if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
697 kref_get(&hard_iface->refcount);
699 dev_hold(soft_iface);
700 hard_iface->soft_iface = soft_iface;
701 bat_priv = netdev_priv(hard_iface->soft_iface);
703 ret = netdev_master_upper_dev_link(hard_iface->net_dev,
704 soft_iface, NULL, NULL, NULL);
708 ret = bat_priv->algo_ops->iface.enable(hard_iface);
712 hard_iface->if_status = BATADV_IF_INACTIVE;
714 kref_get(&hard_iface->refcount);
715 hard_iface->batman_adv_ptype.type = ethertype;
716 hard_iface->batman_adv_ptype.func = batadv_batman_skb_recv;
717 hard_iface->batman_adv_ptype.dev = hard_iface->net_dev;
718 dev_add_pack(&hard_iface->batman_adv_ptype);
720 batadv_info(hard_iface->soft_iface, "Adding interface: %s\n",
721 hard_iface->net_dev->name);
723 if (atomic_read(&bat_priv->fragmentation) &&
724 hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
725 batadv_info(hard_iface->soft_iface,
726 "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",
727 hard_iface->net_dev->name, hard_iface->net_dev->mtu,
728 ETH_DATA_LEN + max_header_len);
730 if (!atomic_read(&bat_priv->fragmentation) &&
731 hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
732 batadv_info(hard_iface->soft_iface,
733 "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",
734 hard_iface->net_dev->name, hard_iface->net_dev->mtu,
735 ETH_DATA_LEN + max_header_len);
737 if (batadv_hardif_is_iface_up(hard_iface))
738 batadv_hardif_activate_interface(hard_iface);
740 batadv_err(hard_iface->soft_iface,
741 "Not using interface %s (retrying later): interface not active\n",
742 hard_iface->net_dev->name);
744 batadv_hardif_recalc_extra_skbroom(soft_iface);
746 if (bat_priv->algo_ops->iface.enabled)
747 bat_priv->algo_ops->iface.enabled(hard_iface);
753 netdev_upper_dev_unlink(hard_iface->net_dev, soft_iface);
755 hard_iface->soft_iface = NULL;
757 batadv_hardif_put(hard_iface);
762 * batadv_hardif_cnt() - get number of interfaces enslaved to soft interface
763 * @soft_iface: soft interface to check
765 * This function is only using RCU for locking - the result can therefore be
766 * off when another function is modifying the list at the same time. The
767 * caller can use the rtnl_lock to make sure that the count is accurate.
769 * Return: number of connected/enslaved hard interfaces
771 static size_t batadv_hardif_cnt(const struct net_device *soft_iface)
773 struct batadv_hard_iface *hard_iface;
777 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
778 if (hard_iface->soft_iface != soft_iface)
789 * batadv_hardif_disable_interface() - Remove hard interface from soft interface
790 * @hard_iface: hard interface to be removed
792 void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface)
794 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
795 struct batadv_hard_iface *primary_if = NULL;
797 batadv_hardif_deactivate_interface(hard_iface);
799 if (hard_iface->if_status != BATADV_IF_INACTIVE)
802 batadv_info(hard_iface->soft_iface, "Removing interface: %s\n",
803 hard_iface->net_dev->name);
804 dev_remove_pack(&hard_iface->batman_adv_ptype);
805 batadv_hardif_put(hard_iface);
807 primary_if = batadv_primary_if_get_selected(bat_priv);
808 if (hard_iface == primary_if) {
809 struct batadv_hard_iface *new_if;
811 new_if = batadv_hardif_get_active(hard_iface->soft_iface);
812 batadv_primary_if_select(bat_priv, new_if);
815 batadv_hardif_put(new_if);
818 bat_priv->algo_ops->iface.disable(hard_iface);
819 hard_iface->if_status = BATADV_IF_NOT_IN_USE;
821 /* delete all references to this hard_iface */
822 batadv_purge_orig_ref(bat_priv);
823 batadv_purge_outstanding_packets(bat_priv, hard_iface);
824 dev_put(hard_iface->soft_iface);
826 netdev_upper_dev_unlink(hard_iface->net_dev, hard_iface->soft_iface);
827 batadv_hardif_recalc_extra_skbroom(hard_iface->soft_iface);
829 /* nobody uses this interface anymore */
830 if (batadv_hardif_cnt(hard_iface->soft_iface) <= 1)
831 batadv_gw_check_client_stop(bat_priv);
833 hard_iface->soft_iface = NULL;
834 batadv_hardif_put(hard_iface);
838 batadv_hardif_put(primary_if);
841 static struct batadv_hard_iface *
842 batadv_hardif_add_interface(struct net_device *net_dev)
844 struct batadv_hard_iface *hard_iface;
848 if (!batadv_is_valid_iface(net_dev))
853 hard_iface = kzalloc(sizeof(*hard_iface), GFP_ATOMIC);
857 hard_iface->net_dev = net_dev;
858 hard_iface->soft_iface = NULL;
859 hard_iface->if_status = BATADV_IF_NOT_IN_USE;
861 INIT_LIST_HEAD(&hard_iface->list);
862 INIT_HLIST_HEAD(&hard_iface->neigh_list);
864 mutex_init(&hard_iface->bat_iv.ogm_buff_mutex);
865 spin_lock_init(&hard_iface->neigh_list_lock);
866 kref_init(&hard_iface->refcount);
868 hard_iface->num_bcasts = BATADV_NUM_BCASTS_DEFAULT;
869 hard_iface->wifi_flags = batadv_wifi_flags_evaluate(net_dev);
870 if (batadv_is_wifi_hardif(hard_iface))
871 hard_iface->num_bcasts = BATADV_NUM_BCASTS_WIRELESS;
873 atomic_set(&hard_iface->hop_penalty, 0);
875 batadv_v_hardif_init(hard_iface);
877 batadv_check_known_mac_addr(hard_iface->net_dev);
878 kref_get(&hard_iface->refcount);
879 list_add_tail_rcu(&hard_iface->list, &batadv_hardif_list);
880 batadv_hardif_generation++;
890 static void batadv_hardif_remove_interface(struct batadv_hard_iface *hard_iface)
894 /* first deactivate interface */
895 if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
896 batadv_hardif_disable_interface(hard_iface);
898 if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
901 hard_iface->if_status = BATADV_IF_TO_BE_REMOVED;
902 batadv_hardif_put(hard_iface);
906 * batadv_hard_if_event_softif() - Handle events for soft interfaces
907 * @event: NETDEV_* event to handle
908 * @net_dev: net_device which generated an event
910 * Return: NOTIFY_* result
912 static int batadv_hard_if_event_softif(unsigned long event,
913 struct net_device *net_dev)
915 struct batadv_priv *bat_priv;
918 case NETDEV_REGISTER:
919 bat_priv = netdev_priv(net_dev);
920 batadv_softif_create_vlan(bat_priv, BATADV_NO_FLAGS);
927 static int batadv_hard_if_event(struct notifier_block *this,
928 unsigned long event, void *ptr)
930 struct net_device *net_dev = netdev_notifier_info_to_dev(ptr);
931 struct batadv_hard_iface *hard_iface;
932 struct batadv_hard_iface *primary_if = NULL;
933 struct batadv_priv *bat_priv;
935 if (batadv_softif_is_valid(net_dev))
936 return batadv_hard_if_event_softif(event, net_dev);
938 hard_iface = batadv_hardif_get_by_netdev(net_dev);
939 if (!hard_iface && (event == NETDEV_REGISTER ||
940 event == NETDEV_POST_TYPE_CHANGE))
941 hard_iface = batadv_hardif_add_interface(net_dev);
948 batadv_hardif_activate_interface(hard_iface);
950 case NETDEV_GOING_DOWN:
952 batadv_hardif_deactivate_interface(hard_iface);
954 case NETDEV_UNREGISTER:
955 case NETDEV_PRE_TYPE_CHANGE:
956 list_del_rcu(&hard_iface->list);
957 batadv_hardif_generation++;
959 batadv_hardif_remove_interface(hard_iface);
961 case NETDEV_CHANGEMTU:
962 if (hard_iface->soft_iface)
963 batadv_update_min_mtu(hard_iface->soft_iface);
965 case NETDEV_CHANGEADDR:
966 if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
969 batadv_check_known_mac_addr(hard_iface->net_dev);
971 bat_priv = netdev_priv(hard_iface->soft_iface);
972 bat_priv->algo_ops->iface.update_mac(hard_iface);
974 primary_if = batadv_primary_if_get_selected(bat_priv);
978 if (hard_iface == primary_if)
979 batadv_primary_if_update_addr(bat_priv, NULL);
981 case NETDEV_CHANGEUPPER:
982 hard_iface->wifi_flags = batadv_wifi_flags_evaluate(net_dev);
983 if (batadv_is_wifi_hardif(hard_iface))
984 hard_iface->num_bcasts = BATADV_NUM_BCASTS_WIRELESS;
991 batadv_hardif_put(hard_iface);
994 batadv_hardif_put(primary_if);
998 struct notifier_block batadv_hard_if_notifier = {
999 .notifier_call = batadv_hard_if_event,